Merge topic 'server-mode-install-fix'

c150bf087c Server mode: Fix regression of hasInstallRule

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !2735
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 699fd4d..75a0b52 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -538,7 +538,7 @@
   #---------------------------------------------------------------------
   # Build jsoncpp library.
   if(CMAKE_USE_SYSTEM_JSONCPP)
-    find_package(JsonCpp)
+    find_package(JsonCpp 1.4.1)
     if(NOT JsonCpp_FOUND)
       message(FATAL_ERROR
         "CMAKE_USE_SYSTEM_JSONCPP is ON but a JsonCpp is not found!")
diff --git a/Help/index.rst b/Help/index.rst
index fe1b73c..a948939 100644
--- a/Help/index.rst
+++ b/Help/index.rst
@@ -30,6 +30,7 @@
    /manual/cmake-compile-features.7
    /manual/cmake-developer.7
    /manual/cmake-env-variables.7
+   /manual/cmake-file-api.7
    /manual/cmake-generator-expressions.7
    /manual/cmake-generators.7
    /manual/cmake-language.7
diff --git a/Help/manual/cmake-file-api.7.rst b/Help/manual/cmake-file-api.7.rst
new file mode 100644
index 0000000..f3e0208
--- /dev/null
+++ b/Help/manual/cmake-file-api.7.rst
@@ -0,0 +1,1111 @@
+.. cmake-manual-description: CMake File-Based API
+
+cmake-file-api(7)
+*****************
+
+.. only:: html
+
+   .. contents::
+
+Introduction
+============
+
+CMake provides a file-based API that clients may use to get semantic
+information about the buildsystems CMake generates.  Clients may use
+the API by writing query files to a specific location in a build tree
+to request zero or more `Object Kinds`_.  When CMake generates the
+buildsystem in that build tree it will read the query files and write
+reply files for the client to read.
+
+The file-based API uses a ``<build>/.cmake/api/`` directory at the top
+of a build tree.  The API is versioned to support changes to the layout
+of files within the API directory.  API file layout versioning is
+orthogonal to the versioning of `Object Kinds`_ used in replies.
+This version of CMake supports only one API version, `API v1`_.
+
+API v1
+======
+
+API v1 is housed in the ``<build>/.cmake/api/v1/`` directory.
+It has the following subdirectories:
+
+``query/``
+  Holds query files written by clients.
+  These may be `v1 Shared Stateless Query Files`_,
+  `v1 Client Stateless Query Files`_, or `v1 Client Stateful Query Files`_.
+
+``reply/``
+  Holds reply files written by CMake whenever it runs to generate a build
+  system.  These are indexed by a `v1 Reply Index File`_ file that may
+  reference additional `v1 Reply Files`_.  CMake owns all reply files.
+  Clients must never remove them.
+
+  Clients may look for and read a reply index file at any time.
+  Clients may optionally create the ``reply/`` directory at any time
+  and monitor it for the appearance of a new reply index file.
+
+v1 Shared Stateless Query Files
+-------------------------------
+
+Shared stateless query files allow clients to share requests for
+major versions of the `Object Kinds`_ and get all requested versions
+recognized by the CMake that runs.
+
+Clients may create shared requests by creating empty files in the
+``v1/query/`` directory.  The form is::
+
+  <build>/.cmake/api/v1/query/<kind>-v<major>
+
+where ``<kind>`` is one of the `Object Kinds`_, ``-v`` is literal,
+and ``<major>`` is the major version number.
+
+Files of this form are stateless shared queries not owned by any specific
+client.  Once created they should not be removed without external client
+coordination or human intervention.
+
+v1 Client Stateless Query Files
+-------------------------------
+
+Client stateless query files allow clients to create owned requests for
+major versions of the `Object Kinds`_ and get all requested versions
+recognized by the CMake that runs.
+
+Clients may create owned requests by creating empty files in
+client-specific query subdirectories.  The form is::
+
+  <build>/.cmake/api/v1/query/client-<client>/<kind>-v<major>
+
+where ``client-`` is literal, ``<client>`` is a string uniquely
+identifying the client, ``<kind>`` is one of the `Object Kinds`_,
+``-v`` is literal, and ``<major>`` is the major version number.
+Each client must choose a unique ``<client>`` identifier via its
+own means.
+
+Files of this form are stateless queries owned by the client ``<client>``.
+The owning client may remove them at any time.
+
+v1 Client Stateful Query Files
+------------------------------
+
+Stateful query files allow clients to request a list of versions of
+each of the `Object Kinds`_ and get only the most recent version
+recognized by the CMake that runs.
+
+Clients may create owned stateful queries by creating ``query.json``
+files in client-specific query subdirectories.  The form is::
+
+  <build>/.cmake/api/v1/query/client-<client>/query.json
+
+where ``client-`` is literal, ``<client>`` is a string uniquely
+identifying the client, and ``query.json`` is literal.  Each client
+must choose a unique ``<client>`` identifier via its own means.
+
+``query.json`` files are stateful queries owned by the client ``<client>``.
+The owning client may update or remove them at any time.  When a
+given client installation is updated it may then update the stateful
+query it writes to build trees to request newer object versions.
+This can be used to avoid asking CMake to generate multiple object
+versions unnecessarily.
+
+A ``query.json`` file must contain a JSON object:
+
+.. code-block:: json
+
+  {
+    "requests": [
+      { "kind": "<kind>" , "version": 1 },
+      { "kind": "<kind>" , "version": { "major": 1, "minor": 2 } },
+      { "kind": "<kind>" , "version": [2, 1] },
+      { "kind": "<kind>" , "version": [2, { "major": 1, "minor": 2 }] },
+      { "kind": "<kind>" , "version": 1, "client": {} },
+      { "kind": "..." }
+    ],
+    "client": {}
+  }
+
+The members are:
+
+``requests``
+  A JSON array containing zero or more requests.  Each request is
+  a JSON object with members:
+
+  ``kind``
+    Specifies one of the `Object Kinds`_ to be included in the reply.
+
+  ``version``
+    Indicates the version(s) of the object kind that the client
+    understands.  Versions have major and minor components following
+    semantic version conventions.  The value must be
+
+    * a JSON integer specifying a (non-negative) major version number, or
+    * a JSON object containing ``major`` and (optionally) ``minor``
+      members specifying non-negative integer version components, or
+    * a JSON array whose elements are each one of the above.
+
+  ``client``
+    Optional member reserved for use by the client.  This value is
+    preserved in the reply written for the client in the
+    `v1 Reply Index File`_ but is otherwise ignored.  Clients may use
+    this to pass custom information with a request through to its reply.
+
+  For each requested object kind CMake will choose the *first* version
+  that it recognizes for that kind among those listed in the request.
+  The response will use the selected *major* version with the highest
+  *minor* version known to the running CMake for that major version.
+  Therefore clients should list all supported major versions in
+  preferred order along with the minimal minor version required
+  for each major version.
+
+``client``
+  Optional member reserved for use by the client.  This value is
+  preserved in the reply written for the client in the
+  `v1 Reply Index File`_ but is otherwise ignored.  Clients may use
+  this to pass custom information with a query through to its reply.
+
+Other ``query.json`` top-level members are reserved for future use.
+If present they are ignored for forward compatibility.
+
+v1 Reply Index File
+-------------------
+
+CMake writes an ``index-*.json`` file to the ``v1/reply/`` directory
+whenever it runs to generate a build system.  Clients must read the
+reply index file first and may read other `v1 Reply Files`_ only by
+following references.  The form of the reply index file name is::
+
+  <build>/.cmake/api/v1/reply/index-<unspecified>.json
+
+where ``index-`` is literal and ``<unspecified>`` is an unspecified
+name selected by CMake.  Whenever a new index file is generated it
+is given a new name and any old one is deleted.  During the short
+time between these steps there may be multiple index files present;
+the one with the largest name in lexicographic order is the current
+index file.
+
+The reply index file contains a JSON object:
+
+.. code-block:: json
+
+  {
+    "cmake": {
+      "version": {
+        "major": 3, "minor": 14, "patch": 0, "suffix": "",
+        "string": "3.14.0", "isDirty": false
+      },
+      "paths": {
+        "cmake": "/prefix/bin/cmake",
+        "ctest": "/prefix/bin/ctest",
+        "cpack": "/prefix/bin/cpack",
+        "root": "/prefix/share/cmake-3.14"
+      },
+      "generator": {
+        "name": "Unix Makefiles"
+      }
+    },
+    "objects": [
+      { "kind": "<kind>",
+        "version": { "major": 1, "minor": 0 },
+        "jsonFile": "<file>" },
+      { "...": "..." }
+    ],
+    "reply": {
+      "<kind>-v<major>": { "kind": "<kind>",
+                           "version": { "major": 1, "minor": 0 },
+                           "jsonFile": "<file>" },
+      "<unknown>": { "error": "unknown query file" },
+      "...": {},
+      "client-<client>": {
+        "<kind>-v<major>": { "kind": "<kind>",
+                             "version": { "major": 1, "minor": 0 },
+                             "jsonFile": "<file>" },
+        "<unknown>": { "error": "unknown query file" },
+        "...": {},
+        "query.json": {
+          "requests": [ {}, {}, {} ],
+          "responses": [
+            { "kind": "<kind>",
+              "version": { "major": 1, "minor": 0 },
+              "jsonFile": "<file>" },
+            { "error": "unknown query file" },
+            { "...": {} }
+          ],
+          "client": {}
+        }
+      }
+    }
+  }
+
+The members are:
+
+``cmake``
+  A JSON object containing information about the instance of CMake that
+  generated the reply.  It contains members:
+
+  ``version``
+    A JSON object specifying the version of CMake with members:
+
+    ``major``, ``minor``, ``patch``
+      Integer values specifying the major, minor, and patch version components.
+    ``suffix``
+      A string specifying the version suffix, if any, e.g. ``g0abc3``.
+    ``string``
+      A string specifying the full version in the format
+      ``<major>.<minor>.<patch>[-<suffix>]``.
+    ``isDirty``
+      A boolean indicating whether the version was built from a version
+      controlled source tree with local modifications.
+
+  ``paths``
+    A JSON object specifying paths to things that come with CMake.
+    It has members for ``cmake``, ``ctest``, and ``cpack`` whose values
+    are JSON strings specifying the absolute path to each tool,
+    represented with forward slashes.  It also has a ``root`` member for
+    the absolute path to the directory containing CMake resources like the
+    ``Modules/`` directory (see :variable:`CMAKE_ROOT`).
+
+  ``generator``
+    A JSON object describing the CMake generator used for the build.
+    It has members:
+
+    ``name``
+      A string specifying the name of the generator.
+    ``platform``
+      If the generator supports :variable:`CMAKE_GENERATOR_PLATFORM`,
+      this is a string specifying the generator platform name.
+
+``objects``
+  A JSON array listing all versions of all `Object Kinds`_ generated
+  as part of the reply.  Each array entry is a
+  `v1 Reply File Reference`_.
+
+``reply``
+  A JSON object mirroring the content of the ``query/`` directory
+  that CMake loaded to produce the reply.  The members are of the form
+
+  ``<kind>-v<major>``
+    A member of this form appears for each of the
+    `v1 Shared Stateless Query Files`_ that CMake recognized as a
+    request for object kind ``<kind>`` with major version ``<major>``.
+    The value is a `v1 Reply File Reference`_ to the corresponding
+    reply file for that object kind and version.
+
+  ``<unknown>``
+    A member of this form appears for each of the
+    `v1 Shared Stateless Query Files`_ that CMake did not recognize.
+    The value is a JSON object with a single ``error`` member
+    containing a string with an error message indicating that the
+    query file is unknown.
+
+  ``client-<client>``
+    A member of this form appears for each client-owned directory
+    holding `v1 Client Stateless Query Files`_.
+    The value is a JSON object mirroring the content of the
+    ``query/client-<client>/`` directory.  The members are of the form:
+
+    ``<kind>-v<major>``
+      A member of this form appears for each of the
+      `v1 Client Stateless Query Files`_ that CMake recognized as a
+      request for object kind ``<kind>`` with major version ``<major>``.
+      The value is a `v1 Reply File Reference`_ to the corresponding
+      reply file for that object kind and version.
+
+    ``<unknown>``
+      A member of this form appears for each of the
+      `v1 Client Stateless Query Files`_ that CMake did not recognize.
+      The value is a JSON object with a single ``error`` member
+      containing a string with an error message indicating that the
+      query file is unknown.
+
+    ``query.json``
+      This member appears for clients using
+      `v1 Client Stateful Query Files`_.
+      If the ``query.json`` file failed to read or parse as a JSON object,
+      this member is a JSON object with a single ``error`` member
+      containing a string with an error message.  Otherwise, this member
+      is a JSON object mirroring the content of the ``query.json`` file.
+      The members are:
+
+      ``client``
+        A copy of the ``query.json`` file ``client`` member, if it exists.
+
+      ``requests``
+        A copy of the ``query.json`` file ``requests`` member, if it exists.
+
+      ``responses``
+        If the ``query.json`` file ``requests`` member is missing or invalid,
+        this member is a JSON object with a single ``error`` member
+        containing a string with an error message.  Otherwise, this member
+        contains a JSON array with a response for each entry of the
+        ``requests`` array, in the same order.  Each response is
+
+        * a JSON object with a single ``error`` member containing a string
+          with an error message, or
+        * a `v1 Reply File Reference`_ to the corresponding reply file for
+          the requested object kind and selected version.
+
+After reading the reply index file, clients may read the other
+`v1 Reply Files`_ it references.
+
+v1 Reply File Reference
+^^^^^^^^^^^^^^^^^^^^^^^
+
+The reply index file represents each reference to another reply file
+using a JSON object with members:
+
+``kind``
+  A string specifying one of the `Object Kinds`_.
+``version``
+  A JSON object with members ``major`` and ``minor`` specifying
+  integer version components of the object kind.
+``jsonFile``
+  A JSON string specifying a path relative to the reply index file
+  to another JSON file containing the object.
+
+v1 Reply Files
+--------------
+
+Reply files containing specific `Object Kinds`_ are written by CMake.
+The names of these files are unspecified and must not be interpreted
+by clients.  Clients must first read the `v1 Reply Index File`_ and
+and follow references to the names of the desired response objects.
+
+Reply files (including the index file) will never be replaced by
+files of the same name but different content.  This allows a client
+to read the files concurrently with a running CMake that may generate
+a new reply.  However, after generating a new reply CMake will attempt
+to remove reply files from previous runs that it did not just write.
+If a client attempts to read a reply file referenced by the index but
+finds the file missing, that means a concurrent CMake has generated
+a new reply.  The client may simply start again by reading the new
+reply index file.
+
+Object Kinds
+============
+
+The CMake file-based API reports semantic information about the build
+system using the following kinds of JSON objects.  Each kind of object
+is versioned independently using semantic versioning with major and
+minor components.  Every kind of object has the form:
+
+.. code-block:: json
+
+  {
+    "kind": "<kind>",
+    "version": { "major": 1, "minor": 0 },
+    "...": {}
+  }
+
+The ``kind`` member is a string specifying the object kind name.
+The ``version`` member is a JSON object with ``major`` and ``minor``
+members specifying integer components of the object kind's version.
+Additional top-level members are specific to each object kind.
+
+Object Kind "codemodel"
+-----------------------
+
+The ``codemodel`` object kind describes the build system structure as
+modeled by CMake.
+
+There is only one ``codemodel`` object major version, version 2.
+Version 1 does not exist to avoid confusion with that from
+:manual:`cmake-server(7)` mode.
+
+"codemodel" version 2
+^^^^^^^^^^^^^^^^^^^^^
+
+``codemodel`` object version 2 is a JSON object:
+
+.. code-block:: json
+
+  {
+    "kind": "codemodel",
+    "version": { "major": 2, "minor": 0 },
+    "paths": {
+      "source": "/path/to/top-level-source-dir",
+      "build": "/path/to/top-level-build-dir"
+    },
+    "configurations": [
+      {
+        "name": "Debug",
+        "directories": [
+          {
+            "source": ".",
+            "build": ".",
+            "childIndexes": [ 1 ],
+            "projectIndex": 0,
+            "targetIndexes": [ 0 ],
+            "hasInstallRule": true,
+            "minimumCMakeVersion": {
+              "string": "3.14"
+            }
+          },
+          {
+            "source": "sub",
+            "build": "sub",
+            "parentIndex": 0,
+            "projectIndex": 0,
+            "targetIndexes": [ 1 ],
+            "minimumCMakeVersion": {
+              "string": "3.14"
+            }
+          }
+        ],
+        "projects": [
+          {
+            "name": "MyProject",
+            "directoryIndexes": [ 0, 1 ],
+            "targetIndexes": [ 0, 1 ]
+          }
+        ],
+        "targets": [
+          {
+            "name": "MyExecutable",
+            "directoryIndex": 0,
+            "projectIndex": 0,
+            "jsonFile": "<file>"
+          },
+          {
+            "name": "MyLibrary",
+            "directoryIndex": 1,
+            "projectIndex": 0,
+            "jsonFile": "<file>"
+          }
+        ]
+      }
+    ]
+  }
+
+The members specific to ``codemodel`` objects are:
+
+``paths``
+  A JSON object containing members:
+
+  ``source``
+    A string specifying the absolute path to the top-level source directory,
+    represented with forward slashes.
+
+  ``build``
+    A string specifying the absolute path to the top-level build directory,
+    represented with forward slashes.
+
+``configurations``
+  A JSON array of entries corresponding to available build configurations.
+  On single-configuration generators there is one entry for the value
+  of the :variable:`CMAKE_BUILD_TYPE` variable.  For multi-configuration
+  generators there is an entry for each configuration listed in the
+  :variable:`CMAKE_CONFIGURATION_TYPES` variable.
+  Each entry is a JSON object containing members:
+
+  ``name``
+    A string specifying the name of the configuration, e.g. ``Debug``.
+
+  ``directories``
+    A JSON array of entries each corresponding to a build system directory
+    whose source directory contains a ``CMakeLists.txt`` file.  The first
+    entry corresponds to the top-level directory.  Each entry is a
+    JSON object containing members:
+
+    ``source``
+      A string specifying the path to the source directory, represented
+      with forward slashes.  If the directory is inside the top-level
+      source directory then the path is specified relative to that
+      directory (with ``.`` for the top-level source directory itself).
+      Otherwise the path is absolute.
+
+    ``build``
+      A string specifying the path to the build directory, represented
+      with forward slashes.  If the directory is inside the top-level
+      build directory then the path is specified relative to that
+      directory (with ``.`` for the top-level build directory itself).
+      Otherwise the path is absolute.
+
+    ``parentIndex``
+      Optional member that is present when the directory is not top-level.
+      The value is an unsigned integer 0-based index of another entry in
+      the main ``directories`` array that corresponds to the parent
+      directory that added this directory as a subdirectory.
+
+    ``childIndexes``
+      Optional member that is present when the directory has subdirectories.
+      The value is a JSON array of entries corresponding to child directories
+      created by the :command:`add_subdirectory` or :command:`subdirs`
+      command.  Each entry is an unsigned integer 0-based index of another
+      entry in the main ``directories`` array.
+
+    ``projectIndex``
+      An unsigned integer 0-based index into the main ``projects`` array
+      indicating the build system project to which the this directory belongs.
+
+    ``targetIndexes``
+      Optional member that is present when the directory itself has targets,
+      excluding those belonging to subdirectories.  The value is a JSON
+      array of entries corresponding to the targets.  Each entry is an
+      unsigned integer 0-based index into the main ``targets`` array.
+
+    ``minimumCMakeVersion``
+      Optional member present when a minimum required version of CMake is
+      known for the directory.  This is the ``<min>`` version given to the
+      most local call to the :command:`cmake_minimum_required(VERSION)`
+      command in the directory itself or one of its ancestors.
+      The value is a JSON object with one member:
+
+      ``string``
+        A string specifying the minimum required version in the format::
+
+          <major>.<minor>[.<patch>[.<tweak>]][<suffix>]
+
+        Each component is an unsigned integer and the suffix may be an
+        arbitrary string.
+
+    ``hasInstallRule``
+      Optional member that is present with boolean value ``true`` when
+      the directory or one of its subdirectories contains any
+      :command:`install` rules, i.e. whether a ``make install``
+      or equivalent rule is available.
+
+  ``projects``
+    A JSON array of entries corresponding to the top-level project
+    and sub-projects defined in the build system.  Each (sub-)project
+    corresponds to a source directory whose ``CMakeLists.txt`` file
+    calls the :command:`project` command with a project name different
+    from its parent directory.  The first entry corresponds to the
+    top-level project.
+
+    Each entry is a JSON object containing members:
+
+    ``name``
+      A string specifying the name given to the :command:`project` command.
+
+    ``parentIndex``
+      Optional member that is present when the project is not top-level.
+      The value is an unsigned integer 0-based index of another entry in
+      the main ``projects`` array that corresponds to the parent project
+      that added this project as a sub-project.
+
+    ``childIndexes``
+      Optional member that is present when the project has sub-projects.
+      The value is a JSON array of entries corresponding to the sub-projects.
+      Each entry is an unsigned integer 0-based index of another
+      entry in the main ``projects`` array.
+
+    ``directoryIndexes``
+      A JSON array of entries corresponding to build system directories
+      that are part of the project.  The first entry corresponds to the
+      top-level directory of the project.  Each entry is an unsigned
+      integer 0-based index into the main ``directories`` array.
+
+    ``targetIndexes``
+      Optional member that is present when the project itself has targets,
+      excluding those belonging to sub-projects.  The value is a JSON
+      array of entries corresponding to the targets.  Each entry is an
+      unsigned integer 0-based index into the main ``targets`` array.
+
+  ``targets``
+    A JSON array of entries corresponding to the build system targets.
+    Such targets are created by calls to :command:`add_executable`,
+    :command:`add_library`, and :command:`add_custom_target`, excluding
+    imported targets and interface libraries (which do not generate any
+    build rules).  Each entry is a JSON object containing members:
+
+    ``name``
+      A string specifying the target name.
+
+    ``id``
+      A string uniquely identifying the target.  This matches the ``id``
+      field in the file referenced by ``jsonFile``.
+
+    ``directoryIndex``
+      An unsigned integer 0-based index into the main ``directories`` array
+      indicating the build system directory in which the target is defined.
+
+    ``projectIndex``
+      An unsigned integer 0-based index into the main ``projects`` array
+      indicating the build system project in which the target is defined.
+
+    ``jsonFile``
+      A JSON string specifying a path relative to the codemodel file
+      to another JSON file containing a
+      `"codemodel" version 2 "target" object`_.
+
+"codemodel" version 2 "target" object
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+A codemodel "target" object is referenced by a `"codemodel" version 2`_
+object's ``targets`` array.  Each "target" object is a JSON object
+with members:
+
+``name``
+  A string specifying the logical name of the target.
+
+``id``
+  A string uniquely identifying the target.  The format is unspecified
+  and should not be interpreted by clients.
+
+``type``
+  A string specifying the type of the target.  The value is one of
+  ``EXECUTABLE``, ``STATIC_LIBRARY``, ``SHARED_LIBRARY``,
+  ``MODULE_LIBRARY``, ``OBJECT_LIBRARY``, or ``UTILITY``.
+
+``backtrace``
+  Optional member that is present when a CMake language backtrace to
+  the command in the source code that created the target is available.
+  The value is an unsigned integer 0-based index into the
+  ``backtraceGraph`` member's ``nodes`` array.
+
+``folder``
+  Optional member that is present when the :prop_tgt:`FOLDER` target
+  property is set.  The value is a JSON object with one member:
+
+  ``name``
+    A string specifying the name of the target folder.
+
+``paths``
+  A JSON object containing members:
+
+  ``source``
+    A string specifying the path to the target's source directory,
+    represented with forward slashes.  If the directory is inside the
+    top-level source directory then the path is specified relative to
+    that directory (with ``.`` for the top-level source directory itself).
+    Otherwise the path is absolute.
+
+  ``build``
+    A string specifying the path to the target's build directory,
+    represented with forward slashes.  If the directory is inside the
+    top-level build directory then the path is specified relative to
+    that directory (with ``.`` for the top-level build directory itself).
+    Otherwise the path is absolute.
+
+``nameOnDisk``
+  Optional member that is present for executable and library targets
+  that are linked or archived into a single primary artifact.
+  The value is a string specifying the file name of that artifact on disk.
+
+``artifacts``
+  Optional member that is present for executable and library targets
+  that produce artifacts on disk meant for consumption by dependents.
+  The value is a JSON array of entries corresponding to the artifacts.
+  Each entry is a JSON object containing one member:
+
+  ``path``
+    A string specifying the path to the file on disk, represented with
+    forward slashes.  If the file is inside the top-level build directory
+    then the path is specified relative to that directory.
+    Otherwise the path is absolute.
+
+``isGeneratorProvided``
+  Optional member that is present with boolean value ``true`` if the
+  target is provided by CMake's build system generator rather than by
+  a command in the source code.
+
+``install``
+  Optional member that is present when the target has an :command:`install`
+  rule.  The value is a JSON object with members:
+
+  ``prefix``
+    A JSON object specifying the installation prefix.  It has one member:
+
+    ``path``
+      A string specifying the value of :variable:`CMAKE_INSTALL_PREFIX`.
+
+  ``destinations``
+    A JSON array of entries specifying an install destination path.
+    Each entry is a JSON object with members:
+
+    ``path``
+      A string specifying the install destination path.  The path may
+      be absolute or relative to the install prefix.
+
+    ``backtrace``
+      Optional member that is present when a CMake language backtrace to
+      the :command:`install` command invocation that specified this
+      destination is available.  The value is an unsigned integer 0-based
+      index into the ``backtraceGraph`` member's ``nodes`` array.
+
+``link``
+  Optional member that is present for executables and shared library
+  targets that link into a runtime binary.  The value is a JSON object
+  with members describing the link step:
+
+  ``language``
+    A string specifying the language (e.g. ``C``, ``CXX``, ``Fortran``)
+    of the toolchain is used to invoke the linker.
+
+  ``commandFragments``
+    Optional member that is present when fragments of the link command
+    line invocation are available.  The value is a JSON array of entries
+    specifying ordered fragments.  Each entry is a JSON object with members:
+
+    ``fragment``
+      A string specifying a fragment of the link command line invocation.
+      The value is encoded in the build system's native shell format.
+
+    ``role``
+      A string specifying the role of the fragment's content:
+
+      * ``flags``: link flags.
+      * ``libraries``: link library file paths or flags.
+      * ``libraryPath``: library search path flags.
+      * ``frameworkPath``: macOS framework search path flags.
+
+  ``lto``
+    Optional member that is present with boolean value ``true``
+    when link-time optimization (a.k.a. interprocedural optimization
+    or link-time code generation) is enabled.
+
+  ``sysroot``
+    Optional member that is present when the :variable:`CMAKE_SYSROOT_LINK`
+    or :variable:`CMAKE_SYSROOT` variable is defined.  The value is a
+    JSON object with one member:
+
+    ``path``
+      A string specifying the absolute path to the sysroot, represented
+      with forward slashes.
+
+``archive``
+  Optional member that is present for static library targets.  The value
+  is a JSON object with members describing the archive step:
+
+  ``commandFragments``
+    Optional member that is present when fragments of the archiver command
+    line invocation are available.  The value is a JSON array of entries
+    specifying the fragments.  Each entry is a JSON object with members:
+
+    ``fragment``
+      A string specifying a fragment of the archiver command line invocation.
+      The value is encoded in the build system's native shell format.
+
+    ``role``
+      A string specifying the role of the fragment's content:
+
+      * ``flags``: archiver flags.
+
+  ``lto``
+    Optional member that is present with boolean value ``true``
+    when link-time optimization (a.k.a. interprocedural optimization
+    or link-time code generation) is enabled.
+
+``dependencies``
+  Optional member that is present when the target depends on other targets.
+  The value is a JSON array of entries corresponding to the dependencies.
+  Each entry is a JSON object with members:
+
+  ``id``
+    A string uniquely identifying the target on which this target depends.
+    This matches the main ``id`` member of the other target.
+
+  ``backtrace``
+    Optional member that is present when a CMake language backtrace to
+    the :command:`add_dependencies`, :command:`target_link_libraries`,
+    or other command invocation that created this dependency is
+    available.  The value is an unsigned integer 0-based index into
+    the ``backtraceGraph`` member's ``nodes`` array.
+
+``sources``
+  A JSON array of entries corresponding to the target's source files.
+  Each entry is a JSON object with members:
+
+  ``path``
+    A string specifying the path to the source file on disk, represented
+    with forward slashes.  If the file is inside the top-level source
+    directory then the path is specified relative to that directory.
+    Otherwise the path is absolute.
+
+  ``compileGroupIndex``
+    Optional member that is present when the source is compiled.
+    The value is an unsigned integer 0-based index into the
+    ``compileGroups`` array.
+
+  ``sourceGroupIndex``
+    Optional member that is present when the source is part of a source
+    group either via the :command:`source_group` command or by default.
+    The value is an unsigned integer 0-based index into the
+    ``sourceGroups`` array.
+
+  ``isGenerated``
+    Optional member that is present with boolean value ``true`` if
+    the source is :prop_sf:`GENERATED`.
+
+  ``backtrace``
+    Optional member that is present when a CMake language backtrace to
+    the :command:`target_sources`, :command:`add_executable`,
+    :command:`add_library`, :command:`add_custom_target`, or other
+    command invocation that added this source to the target is
+    available.  The value is an unsigned integer 0-based index into
+    the ``backtraceGraph`` member's ``nodes`` array.
+
+``sourceGroups``
+  Optional member that is present when sources are grouped together by
+  the :command:`source_group` command or by default.  The value is a
+  JSON array of entries corresponding to the groups.  Each entry is
+  a JSON object with members:
+
+  ``name``
+    A string specifying the name of the source group.
+
+  ``sourceIndexes``
+    A JSON array listing the sources belonging to the group.
+    Each entry is an unsigned integer 0-based index into the
+    main ``sources`` array for the target.
+
+``compileGroups``
+  Optional member that is present when the target has sources that compile.
+  The value is a JSON array of entries corresponding to groups of sources
+  that all compile with the same settings.  Each entry is a JSON object
+  with members:
+
+  ``sourceIndexes``
+    A JSON array listing the sources belonging to the group.
+    Each entry is an unsigned integer 0-based index into the
+    main ``sources`` array for the target.
+
+  ``language``
+    A string specifying the language (e.g. ``C``, ``CXX``, ``Fortran``)
+    of the toolchain is used to compile the source file.
+
+  ``compileCommandFragments``
+    Optional member that is present when fragments of the compiler command
+    line invocation are available.  The value is a JSON array of entries
+    specifying ordered fragments.  Each entry is a JSON object with
+    one member:
+
+    ``fragment``
+      A string specifying a fragment of the compile command line invocation.
+      The value is encoded in the build system's native shell format.
+
+  ``includes``
+    Optional member that is present when there are include directories.
+    The value is a JSON array with an entry for each directory.  Each
+    entry is a JSON object with members:
+
+    ``path``
+      A string specifying the path to the include directory,
+      represented with forward slashes.
+
+    ``isSystem``
+      Optional member that is present with boolean value ``true`` if
+      the include directory is marked as a system include directory.
+
+    ``backtrace``
+      Optional member that is present when a CMake language backtrace to
+      the :command:`target_include_directories` or other command invocation
+      that added this include directory is available.  The value is
+      an unsigned integer 0-based index into the ``backtraceGraph``
+      member's ``nodes`` array.
+
+  ``defines``
+    Optional member that is present when there are preprocessor definitions.
+    The value is a JSON array with an entry for each definition.  Each
+    entry is a JSON object with members:
+
+    ``define``
+      A string specifying the preprocessor definition in the format
+      ``<name>[=<value>]``, e.g. ``DEF`` or ``DEF=1``.
+
+    ``backtrace``
+      Optional member that is present when a CMake language backtrace to
+      the :command:`target_compile_definitions` or other command invocation
+      that added this preprocessor definition is available.  The value is
+      an unsigned integer 0-based index into the ``backtraceGraph``
+      member's ``nodes`` array.
+
+  ``sysroot``
+    Optional member that is present when the
+    :variable:`CMAKE_SYSROOT_COMPILE` or :variable:`CMAKE_SYSROOT`
+    variable is defined.  The value is a JSON object with one member:
+
+    ``path``
+      A string specifying the absolute path to the sysroot, represented
+      with forward slashes.
+
+``backtraceGraph``
+  A JSON object describing the graph of backtraces whose nodes are
+  referenced from ``backtrace`` members elsewhere.  The members are:
+
+  ``nodes``
+    A JSON array listing nodes in the backtrace graph.  Each entry
+    is a JSON object with members:
+
+    ``file``
+      An unsigned integer 0-based index into the backtrace ``files`` array.
+
+    ``line``
+      An optional member present when the node represents a line within
+      the file.  The value is an unsigned integer 1-based line number.
+
+    ``command``
+      An optional member present when the node represents a command
+      invocation within the file.  The value is an unsigned integer
+      0-based index into the backtrace ``commands`` array.
+
+    ``parent``
+      An optional member present when the node is not the bottom of
+      the call stack.  The value is an unsigned integer 0-based index
+      of another entry in the backtrace ``nodes`` array.
+
+  ``commands``
+    A JSON array listing command names referenced by backtrace nodes.
+    Each entry is a string specifying a command name.
+
+  ``files``
+    A JSON array listing CMake language files referenced by backtrace nodes.
+    Each entry is a string specifying the path to a file, represented
+    with forward slashes.  If the file is inside the top-level source
+    directory then the path is specified relative to that directory.
+    Otherwise the path is absolute.
+
+Object Kind "cache"
+-------------------
+
+The ``cache`` object kind lists cache entries.  These are the
+:ref:`CMake Language Variables` stored in the persistent cache
+(``CMakeCache.txt``) for the build tree.
+
+There is only one ``cache`` object major version, version 2.
+Version 1 does not exist to avoid confusion with that from
+:manual:`cmake-server(7)` mode.
+
+"cache" version 2
+^^^^^^^^^^^^^^^^^
+
+``cache`` object version 2 is a JSON object:
+
+.. code-block:: json
+
+  {
+    "kind": "cache",
+    "version": { "major": 2, "minor": 0 },
+    "entries": [
+      {
+        "name": "BUILD_SHARED_LIBS",
+        "value": "ON",
+        "type": "BOOL",
+        "properties": [
+          {
+            "name": "HELPSTRING",
+            "value": "Build shared libraries"
+          }
+        ]
+      },
+      {
+        "name": "CMAKE_GENERATOR",
+        "value": "Unix Makefiles",
+        "type": "INTERNAL",
+        "properties": [
+          {
+            "name": "HELPSTRING",
+            "value": "Name of generator."
+          }
+        ]
+      }
+    ]
+  }
+
+The members specific to ``cache`` objects are:
+
+``entries``
+  A JSON array whose entries are each a JSON object specifying a
+  cache entry.  The members of each entry are:
+
+  ``name``
+    A string specifying the name of the entry.
+
+  ``value``
+    A string specifying the value of the entry.
+
+  ``type``
+    A string specifying the type of the entry used by
+    :manual:`cmake-gui(1)` to choose a widget for editing.
+
+  ``properties``
+    A JSON array of entries specifying associated
+    :ref:`cache entry properties <Cache Entry Properties>`.
+    Each entry is a JSON object containing members:
+
+    ``name``
+      A string specifying the name of the cache entry property.
+
+    ``value``
+      A string specifying the value of the cache entry property.
+
+Object Kind "cmakeFiles"
+------------------------
+
+The ``cmakeFiles`` object kind lists files used by CMake while
+configuring and generating the build system.  These include the
+``CMakeLists.txt`` files as well as included ``.cmake`` files.
+
+There is only one ``cmakeFiles`` object major version, version 1.
+
+"cmakeFiles" version 1
+^^^^^^^^^^^^^^^^^^^^^^
+
+``cmakeFiles`` object version 1 is a JSON object:
+
+.. code-block:: json
+
+  {
+    "kind": "cmakeFiles",
+    "version": { "major": 1, "minor": 0 },
+    "paths": {
+      "build": "/path/to/top-level-build-dir",
+      "source": "/path/to/top-level-source-dir"
+    },
+    "inputs": [
+      {
+        "path": "CMakeLists.txt"
+      },
+      {
+        "isGenerated": true,
+        "path": "/path/to/top-level-build-dir/.../CMakeSystem.cmake"
+      },
+      {
+        "isExternal": true,
+        "path": "/path/to/external/third-party/module.cmake"
+      },
+      {
+        "isCMake": true,
+        "isExternal": true,
+        "path": "/path/to/cmake/Modules/CMakeGenericSystem.cmake"
+      }
+    ]
+  }
+
+The members specific to ``cmakeFiles`` objects are:
+
+``paths``
+  A JSON object containing members:
+
+  ``source``
+    A string specifying the absolute path to the top-level source directory,
+    represented with forward slashes.
+
+  ``build``
+    A string specifying the absolute path to the top-level build directory,
+    represented with forward slashes.
+
+``inputs``
+  A JSON array whose entries are each a JSON object specifying an input
+  file used by CMake when configuring and generating the build system.
+  The members of each entry are:
+
+  ``path``
+    A string specifying the path to an input file to CMake, represented
+    with forward slashes.  If the file is inside the top-level source
+    directory then the path is specified relative to that directory.
+    Otherwise the path is absolute.
+
+  ``isGenerated``
+    Optional member that is present with boolean value ``true``
+    if the path specifies a file that is under the top-level
+    build directory and the build is out-of-source.
+    This member is not available on in-source builds.
+
+  ``isExternal``
+    Optional member that is present with boolean value ``true``
+    if the path specifies a file that is not under the top-level
+    source or build directories.
+
+  ``isCMake``
+    Optional member that is present with boolean value ``true``
+    if the path specifies a file in the CMake installation.
diff --git a/Help/release/dev/fileapi.rst b/Help/release/dev/fileapi.rst
new file mode 100644
index 0000000..c3f03ef
--- /dev/null
+++ b/Help/release/dev/fileapi.rst
@@ -0,0 +1,5 @@
+fileapi
+-------
+
+* A file-based api for clients to get semantic buildsystem information
+  has been added.  See the :manual:`cmake-file-api(7)` manual.
diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index 464d6f3..91c45bc 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -207,6 +207,14 @@
   cmExtraKateGenerator.h
   cmExtraSublimeTextGenerator.cxx
   cmExtraSublimeTextGenerator.h
+  cmFileAPI.cxx
+  cmFileAPI.h
+  cmFileAPICache.cxx
+  cmFileAPICache.h
+  cmFileAPICodemodel.cxx
+  cmFileAPICodemodel.h
+  cmFileAPICMakeFiles.cxx
+  cmFileAPICMakeFiles.h
   cmFileLock.cxx
   cmFileLock.h
   cmFileLockPool.cxx
@@ -375,6 +383,9 @@
   cmXMLWriter.h
   cmake.cxx
   cmake.h
+  cm_string_view.cxx
+  cm_string_view.hxx
+  cm_static_string_view.hxx
 
   cmCommand.cxx
   cmCommand.h
@@ -566,6 +577,8 @@
   cmSiteNameCommand.h
   cmSourceGroupCommand.cxx
   cmSourceGroupCommand.h
+  cmString.cxx
+  cmString.hxx
   cmStringReplaceHelper.cxx
   cmStringCommand.cxx
   cmStringCommand.h
diff --git a/Source/CMakeVersion.cmake b/Source/CMakeVersion.cmake
index 7abab01..b43f9fd 100644
--- a/Source/CMakeVersion.cmake
+++ b/Source/CMakeVersion.cmake
@@ -1,5 +1,5 @@
 # CMake version number components.
 set(CMake_VERSION_MAJOR 3)
 set(CMake_VERSION_MINOR 13)
-set(CMake_VERSION_PATCH 20181212)
+set(CMake_VERSION_PATCH 20181213)
 #set(CMake_VERSION_RC 1)
diff --git a/Source/cmFileAPI.cxx b/Source/cmFileAPI.cxx
new file mode 100644
index 0000000..89bd258
--- /dev/null
+++ b/Source/cmFileAPI.cxx
@@ -0,0 +1,800 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmFileAPI.h"
+
+#include "cmAlgorithms.h"
+#include "cmCryptoHash.h"
+#include "cmFileAPICMakeFiles.h"
+#include "cmFileAPICache.h"
+#include "cmFileAPICodemodel.h"
+#include "cmGlobalGenerator.h"
+#include "cmSystemTools.h"
+#include "cmTimestamp.h"
+#include "cmake.h"
+#include "cmsys/Directory.hxx"
+#include "cmsys/FStream.hxx"
+
+#include <algorithm>
+#include <cassert>
+#include <chrono>
+#include <ctime>
+#include <iomanip>
+#include <sstream>
+#include <utility>
+
+cmFileAPI::cmFileAPI(cmake* cm)
+  : CMakeInstance(cm)
+{
+  this->APIv1 =
+    this->CMakeInstance->GetHomeOutputDirectory() + "/.cmake/api/v1";
+
+  Json::CharReaderBuilder rbuilder;
+  rbuilder["collectComments"] = false;
+  rbuilder["failIfExtra"] = true;
+  rbuilder["rejectDupKeys"] = false;
+  rbuilder["strictRoot"] = true;
+  this->JsonReader =
+    std::unique_ptr<Json::CharReader>(rbuilder.newCharReader());
+
+  Json::StreamWriterBuilder wbuilder;
+  wbuilder["indentation"] = "\t";
+  this->JsonWriter =
+    std::unique_ptr<Json::StreamWriter>(wbuilder.newStreamWriter());
+}
+
+void cmFileAPI::ReadQueries()
+{
+  std::string const query_dir = this->APIv1 + "/query";
+  this->QueryExists = cmSystemTools::FileIsDirectory(query_dir);
+  if (!this->QueryExists) {
+    return;
+  }
+
+  // Load queries at the top level.
+  std::vector<std::string> queries = cmFileAPI::LoadDir(query_dir);
+
+  // Read the queries and save for later.
+  for (std::string& query : queries) {
+    if (cmHasLiteralPrefix(query, "client-")) {
+      this->ReadClient(query);
+    } else if (!cmFileAPI::ReadQuery(query, this->TopQuery.Known)) {
+      this->TopQuery.Unknown.push_back(std::move(query));
+    }
+  }
+}
+
+void cmFileAPI::WriteReplies()
+{
+  if (this->QueryExists) {
+    cmSystemTools::MakeDirectory(this->APIv1 + "/reply");
+    this->WriteJsonFile(this->BuildReplyIndex(), "index", ComputeSuffixTime);
+  }
+
+  this->RemoveOldReplyFiles();
+}
+
+std::vector<std::string> cmFileAPI::LoadDir(std::string const& dir)
+{
+  std::vector<std::string> files;
+  cmsys::Directory d;
+  d.Load(dir);
+  for (unsigned long i = 0; i < d.GetNumberOfFiles(); ++i) {
+    std::string f = d.GetFile(i);
+    if (f != "." && f != "..") {
+      files.push_back(std::move(f));
+    }
+  }
+  std::sort(files.begin(), files.end());
+  return files;
+}
+
+void cmFileAPI::RemoveOldReplyFiles()
+{
+  std::string const reply_dir = this->APIv1 + "/reply";
+  std::vector<std::string> files = this->LoadDir(reply_dir);
+  for (std::string const& f : files) {
+    if (this->ReplyFiles.find(f) == this->ReplyFiles.end()) {
+      std::string file = reply_dir + "/" + f;
+      cmSystemTools::RemoveFile(file);
+    }
+  }
+}
+
+bool cmFileAPI::ReadJsonFile(std::string const& file, Json::Value& value,
+                             std::string& error)
+{
+  std::vector<char> content;
+
+  cmsys::ifstream fin;
+  if (!cmSystemTools::FileIsDirectory(file)) {
+    fin.open(file.c_str(), std::ios::binary);
+  }
+  auto finEnd = fin.rdbuf()->pubseekoff(0, std::ios::end);
+  if (finEnd > 0) {
+    size_t finSize = finEnd;
+    try {
+      // Allocate a buffer to read the whole file.
+      content.resize(finSize);
+
+      // Now read the file from the beginning.
+      fin.seekg(0, std::ios::beg);
+      fin.read(content.data(), finSize);
+    } catch (...) {
+      fin.setstate(std::ios::failbit);
+    }
+  }
+  fin.close();
+  if (!fin) {
+    value = Json::Value();
+    error = "failed to read from file";
+    return false;
+  }
+
+  // Parse our buffer as json.
+  if (!this->JsonReader->parse(content.data(), content.data() + content.size(),
+                               &value, &error)) {
+    value = Json::Value();
+    return false;
+  }
+
+  return true;
+}
+
+std::string cmFileAPI::WriteJsonFile(
+  Json::Value const& value, std::string const& prefix,
+  std::string (*computeSuffix)(std::string const&))
+{
+  std::string fileName;
+
+  // Write the json file with a temporary name.
+  std::string const& tmpFile = this->APIv1 + "/tmp.json";
+  cmsys::ofstream ftmp(tmpFile.c_str());
+  this->JsonWriter->write(value, &ftmp);
+  ftmp << "\n";
+  ftmp.close();
+  if (!ftmp) {
+    cmSystemTools::RemoveFile(tmpFile);
+    return fileName;
+  }
+
+  // Compute the final name for the file.
+  fileName = prefix + "-" + computeSuffix(tmpFile) + ".json";
+
+  // Create the destination.
+  std::string file = this->APIv1 + "/reply";
+  cmSystemTools::MakeDirectory(file);
+  file += "/";
+  file += fileName;
+
+  // If the final name already exists then assume it has proper content.
+  // Otherwise, atomically place the reply file at its final name
+  if (cmSystemTools::FileExists(file, true) ||
+      !cmSystemTools::RenameFile(tmpFile.c_str(), file.c_str())) {
+    cmSystemTools::RemoveFile(tmpFile);
+  }
+
+  // Record this among files we have just written.
+  this->ReplyFiles.insert(fileName);
+
+  return fileName;
+}
+
+Json::Value cmFileAPI::MaybeJsonFile(Json::Value in, std::string const& prefix)
+{
+  Json::Value out;
+  if (in.isObject() || in.isArray()) {
+    out = Json::objectValue;
+    out["jsonFile"] = this->WriteJsonFile(in, prefix);
+  } else {
+    out = std::move(in);
+  }
+  return out;
+}
+
+std::string cmFileAPI::ComputeSuffixHash(std::string const& file)
+{
+  cmCryptoHash hasher(cmCryptoHash::AlgoSHA3_256);
+  std::string hash = hasher.HashFile(file);
+  hash.resize(20, '0');
+  return hash;
+}
+
+std::string cmFileAPI::ComputeSuffixTime(std::string const&)
+{
+  std::chrono::milliseconds ms =
+    std::chrono::duration_cast<std::chrono::milliseconds>(
+      std::chrono::system_clock::now().time_since_epoch());
+  std::chrono::seconds s =
+    std::chrono::duration_cast<std::chrono::seconds>(ms);
+
+  std::time_t ts = s.count();
+  std::size_t tms = ms.count() % 1000;
+
+  cmTimestamp cmts;
+  std::ostringstream ss;
+  ss << cmts.CreateTimestampFromTimeT(ts, "%Y-%m-%dT%H-%M-%S", true) << '-'
+     << std::setfill('0') << std::setw(4) << tms;
+  return ss.str();
+}
+
+bool cmFileAPI::ReadQuery(std::string const& query,
+                          std::vector<Object>& objects)
+{
+  // Parse the "<kind>-" syntax.
+  std::string::size_type sep_pos = query.find('-');
+  if (sep_pos == std::string::npos) {
+    return false;
+  }
+  std::string kindName = query.substr(0, sep_pos);
+  std::string verStr = query.substr(sep_pos + 1);
+  if (kindName == ObjectKindName(ObjectKind::CodeModel)) {
+    Object o;
+    o.Kind = ObjectKind::CodeModel;
+    if (verStr == "v2") {
+      o.Version = 2;
+    } else {
+      return false;
+    }
+    objects.push_back(o);
+    return true;
+  }
+  if (kindName == ObjectKindName(ObjectKind::Cache)) {
+    Object o;
+    o.Kind = ObjectKind::Cache;
+    if (verStr == "v2") {
+      o.Version = 2;
+    } else {
+      return false;
+    }
+    objects.push_back(o);
+    return true;
+  }
+  if (kindName == ObjectKindName(ObjectKind::CMakeFiles)) {
+    Object o;
+    o.Kind = ObjectKind::CMakeFiles;
+    if (verStr == "v1") {
+      o.Version = 1;
+    } else {
+      return false;
+    }
+    objects.push_back(o);
+    return true;
+  }
+  if (kindName == ObjectKindName(ObjectKind::InternalTest)) {
+    Object o;
+    o.Kind = ObjectKind::InternalTest;
+    if (verStr == "v1") {
+      o.Version = 1;
+    } else if (verStr == "v2") {
+      o.Version = 2;
+    } else {
+      return false;
+    }
+    objects.push_back(o);
+    return true;
+  }
+  return false;
+}
+
+void cmFileAPI::ReadClient(std::string const& client)
+{
+  // Load queries for the client.
+  std::string clientDir = this->APIv1 + "/query/" + client;
+  std::vector<std::string> queries = this->LoadDir(clientDir);
+
+  // Read the queries and save for later.
+  ClientQuery& clientQuery = this->ClientQueries[client];
+  for (std::string& query : queries) {
+    if (query == "query.json") {
+      clientQuery.HaveQueryJson = true;
+      this->ReadClientQuery(client, clientQuery.QueryJson);
+    } else if (!this->ReadQuery(query, clientQuery.DirQuery.Known)) {
+      clientQuery.DirQuery.Unknown.push_back(std::move(query));
+    }
+  }
+}
+
+void cmFileAPI::ReadClientQuery(std::string const& client, ClientQueryJson& q)
+{
+  // Read the query.json file.
+  std::string queryFile = this->APIv1 + "/query/" + client + "/query.json";
+  Json::Value query;
+  if (!this->ReadJsonFile(queryFile, query, q.Error)) {
+    return;
+  }
+  if (!query.isObject()) {
+    q.Error = "query root is not an object";
+    return;
+  }
+
+  Json::Value const& clientValue = query["client"];
+  if (!clientValue.isNull()) {
+    q.ClientValue = clientValue;
+  }
+  q.RequestsValue = std::move(query["requests"]);
+  q.Requests = this->BuildClientRequests(q.RequestsValue);
+}
+
+Json::Value cmFileAPI::BuildReplyIndex()
+{
+  Json::Value index(Json::objectValue);
+
+  // Report information about this version of CMake.
+  index["cmake"] = this->BuildCMake();
+
+  // Reply to all queries that we loaded.
+  Json::Value& reply = index["reply"] = this->BuildReply(this->TopQuery);
+  for (auto const& client : this->ClientQueries) {
+    std::string const& clientName = client.first;
+    ClientQuery const& clientQuery = client.second;
+    reply[clientName] = this->BuildClientReply(clientQuery);
+  }
+
+  // Move our index of generated objects into its field.
+  Json::Value& objects = index["objects"] = Json::arrayValue;
+  for (auto& entry : this->ReplyIndexObjects) {
+    objects.append(std::move(entry.second)); // NOLINT(*)
+  }
+
+  return index;
+}
+
+Json::Value cmFileAPI::BuildCMake()
+{
+  Json::Value cmake = Json::objectValue;
+  cmake["version"] = this->CMakeInstance->ReportVersionJson();
+  Json::Value& cmake_paths = cmake["paths"] = Json::objectValue;
+  cmake_paths["cmake"] = cmSystemTools::GetCMakeCommand();
+  cmake_paths["ctest"] = cmSystemTools::GetCTestCommand();
+  cmake_paths["cpack"] = cmSystemTools::GetCPackCommand();
+  cmake_paths["root"] = cmSystemTools::GetCMakeRoot();
+  cmake["generator"] = this->CMakeInstance->GetGlobalGenerator()->GetJson();
+  return cmake;
+}
+
+Json::Value cmFileAPI::BuildReply(Query const& q)
+{
+  Json::Value reply = Json::objectValue;
+  for (Object const& o : q.Known) {
+    std::string const& name = ObjectName(o);
+    reply[name] = this->AddReplyIndexObject(o);
+  }
+
+  for (std::string const& name : q.Unknown) {
+    reply[name] = cmFileAPI::BuildReplyError("unknown query file");
+  }
+  return reply;
+}
+
+Json::Value cmFileAPI::BuildReplyError(std::string const& error)
+{
+  Json::Value e = Json::objectValue;
+  e["error"] = error;
+  return e;
+}
+
+Json::Value const& cmFileAPI::AddReplyIndexObject(Object const& o)
+{
+  Json::Value& indexEntry = this->ReplyIndexObjects[o];
+  if (!indexEntry.isNull()) {
+    // The reply object has already been generated.
+    return indexEntry;
+  }
+
+  // Generate this reply object.
+  Json::Value const& object = this->BuildObject(o);
+  assert(object.isObject());
+
+  // Populate this index entry.
+  indexEntry = Json::objectValue;
+  indexEntry["kind"] = object["kind"];
+  indexEntry["version"] = object["version"];
+  indexEntry["jsonFile"] = this->WriteJsonFile(object, ObjectName(o));
+  return indexEntry;
+}
+
+const char* cmFileAPI::ObjectKindName(ObjectKind kind)
+{
+  // Keep in sync with ObjectKind enum.
+  static const char* objectKindNames[] = {
+    "codemodel",  //
+    "cache",      //
+    "cmakeFiles", //
+    "__test"      //
+  };
+  return objectKindNames[size_t(kind)];
+}
+
+std::string cmFileAPI::ObjectName(Object const& o)
+{
+  std::string name = ObjectKindName(o.Kind);
+  name += "-v";
+  name += std::to_string(o.Version);
+  return name;
+}
+
+Json::Value cmFileAPI::BuildObject(Object const& object)
+{
+  Json::Value value;
+
+  switch (object.Kind) {
+    case ObjectKind::CodeModel:
+      value = this->BuildCodeModel(object);
+      break;
+    case ObjectKind::Cache:
+      value = this->BuildCache(object);
+      break;
+    case ObjectKind::CMakeFiles:
+      value = this->BuildCMakeFiles(object);
+      break;
+    case ObjectKind::InternalTest:
+      value = this->BuildInternalTest(object);
+      break;
+  }
+
+  return value;
+}
+
+cmFileAPI::ClientRequests cmFileAPI::BuildClientRequests(
+  Json::Value const& requests)
+{
+  ClientRequests result;
+  if (requests.isNull()) {
+    result.Error = "'requests' member missing";
+    return result;
+  }
+  if (!requests.isArray()) {
+    result.Error = "'requests' member is not an array";
+    return result;
+  }
+
+  result.reserve(requests.size());
+  for (Json::Value const& request : requests) {
+    result.emplace_back(this->BuildClientRequest(request));
+  }
+
+  return result;
+}
+
+cmFileAPI::ClientRequest cmFileAPI::BuildClientRequest(
+  Json::Value const& request)
+{
+  ClientRequest r;
+
+  if (!request.isObject()) {
+    r.Error = "request is not an object";
+    return r;
+  }
+
+  Json::Value const& kind = request["kind"];
+  if (kind.isNull()) {
+    r.Error = "'kind' member missing";
+    return r;
+  }
+  if (!kind.isString()) {
+    r.Error = "'kind' member is not a string";
+    return r;
+  }
+  std::string const& kindName = kind.asString();
+
+  if (kindName == this->ObjectKindName(ObjectKind::CodeModel)) {
+    r.Kind = ObjectKind::CodeModel;
+  } else if (kindName == this->ObjectKindName(ObjectKind::Cache)) {
+    r.Kind = ObjectKind::Cache;
+  } else if (kindName == this->ObjectKindName(ObjectKind::CMakeFiles)) {
+    r.Kind = ObjectKind::CMakeFiles;
+  } else if (kindName == this->ObjectKindName(ObjectKind::InternalTest)) {
+    r.Kind = ObjectKind::InternalTest;
+  } else {
+    r.Error = "unknown request kind '" + kindName + "'";
+    return r;
+  }
+
+  Json::Value const& version = request["version"];
+  if (version.isNull()) {
+    r.Error = "'version' member missing";
+    return r;
+  }
+  std::vector<RequestVersion> versions;
+  if (!cmFileAPI::ReadRequestVersions(version, versions, r.Error)) {
+    return r;
+  }
+
+  switch (r.Kind) {
+    case ObjectKind::CodeModel:
+      this->BuildClientRequestCodeModel(r, versions);
+      break;
+    case ObjectKind::Cache:
+      this->BuildClientRequestCache(r, versions);
+      break;
+    case ObjectKind::CMakeFiles:
+      this->BuildClientRequestCMakeFiles(r, versions);
+      break;
+    case ObjectKind::InternalTest:
+      this->BuildClientRequestInternalTest(r, versions);
+      break;
+  }
+
+  return r;
+}
+
+Json::Value cmFileAPI::BuildClientReply(ClientQuery const& q)
+{
+  Json::Value reply = this->BuildReply(q.DirQuery);
+
+  if (!q.HaveQueryJson) {
+    return reply;
+  }
+
+  Json::Value& reply_query_json = reply["query.json"];
+  ClientQueryJson const& qj = q.QueryJson;
+
+  if (!qj.Error.empty()) {
+    reply_query_json = this->BuildReplyError(qj.Error);
+    return reply;
+  }
+
+  if (!qj.ClientValue.isNull()) {
+    reply_query_json["client"] = qj.ClientValue;
+  }
+
+  if (!qj.RequestsValue.isNull()) {
+    reply_query_json["requests"] = qj.RequestsValue;
+  }
+
+  reply_query_json["responses"] = this->BuildClientReplyResponses(qj.Requests);
+
+  return reply;
+}
+
+Json::Value cmFileAPI::BuildClientReplyResponses(
+  ClientRequests const& requests)
+{
+  Json::Value responses;
+
+  if (!requests.Error.empty()) {
+    responses = this->BuildReplyError(requests.Error);
+    return responses;
+  }
+
+  responses = Json::arrayValue;
+  for (ClientRequest const& request : requests) {
+    responses.append(this->BuildClientReplyResponse(request));
+  }
+
+  return responses;
+}
+
+Json::Value cmFileAPI::BuildClientReplyResponse(ClientRequest const& request)
+{
+  Json::Value response;
+  if (!request.Error.empty()) {
+    response = this->BuildReplyError(request.Error);
+    return response;
+  }
+  response = this->AddReplyIndexObject(request);
+  return response;
+}
+
+bool cmFileAPI::ReadRequestVersions(Json::Value const& version,
+                                    std::vector<RequestVersion>& versions,
+                                    std::string& error)
+{
+  if (version.isArray()) {
+    for (Json::Value const& v : version) {
+      if (!ReadRequestVersion(v, /*inArray=*/true, versions, error)) {
+        return false;
+      }
+    }
+  } else {
+    if (!ReadRequestVersion(version, /*inArray=*/false, versions, error)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+bool cmFileAPI::ReadRequestVersion(Json::Value const& version, bool inArray,
+                                   std::vector<RequestVersion>& result,
+                                   std::string& error)
+{
+  if (version.isUInt()) {
+    RequestVersion v;
+    v.Major = version.asUInt();
+    result.push_back(v);
+    return true;
+  }
+
+  if (!version.isObject()) {
+    if (inArray) {
+      error = "'version' array entry is not a non-negative integer or object";
+    } else {
+      error =
+        "'version' member is not a non-negative integer, object, or array";
+    }
+    return false;
+  }
+
+  Json::Value const& major = version["major"];
+  if (major.isNull()) {
+    error = "'version' object 'major' member missing";
+    return false;
+  }
+  if (!major.isUInt()) {
+    error = "'version' object 'major' member is not a non-negative integer";
+    return false;
+  }
+
+  RequestVersion v;
+  v.Major = major.asUInt();
+
+  Json::Value const& minor = version["minor"];
+  if (minor.isUInt()) {
+    v.Minor = minor.asUInt();
+  } else if (!minor.isNull()) {
+    error = "'version' object 'minor' member is not a non-negative integer";
+    return false;
+  }
+
+  result.push_back(v);
+
+  return true;
+}
+
+std::string cmFileAPI::NoSupportedVersion(
+  std::vector<RequestVersion> const& versions)
+{
+  std::ostringstream msg;
+  msg << "no supported version specified";
+  if (!versions.empty()) {
+    msg << " among:";
+    for (RequestVersion const& v : versions) {
+      msg << " " << v.Major << "." << v.Minor;
+    }
+  }
+  return msg.str();
+}
+
+// The "codemodel" object kind.
+
+static unsigned int const CodeModelV2Minor = 0;
+
+void cmFileAPI::BuildClientRequestCodeModel(
+  ClientRequest& r, std::vector<RequestVersion> const& versions)
+{
+  // Select a known version from those requested.
+  for (RequestVersion const& v : versions) {
+    if ((v.Major == 2 && v.Minor <= CodeModelV2Minor)) {
+      r.Version = v.Major;
+      break;
+    }
+  }
+  if (!r.Version) {
+    r.Error = NoSupportedVersion(versions);
+  }
+}
+
+Json::Value cmFileAPI::BuildCodeModel(Object const& object)
+{
+  using namespace std::placeholders;
+  Json::Value codemodel = cmFileAPICodemodelDump(*this, object.Version);
+  codemodel["kind"] = this->ObjectKindName(object.Kind);
+
+  Json::Value& version = codemodel["version"] = Json::objectValue;
+  if (object.Version == 2) {
+    version["major"] = 2;
+    version["minor"] = CodeModelV2Minor;
+  } else {
+    return codemodel; // should be unreachable
+  }
+
+  return codemodel;
+}
+
+// The "cache" object kind.
+
+static unsigned int const CacheV2Minor = 0;
+
+void cmFileAPI::BuildClientRequestCache(
+  ClientRequest& r, std::vector<RequestVersion> const& versions)
+{
+  // Select a known version from those requested.
+  for (RequestVersion const& v : versions) {
+    if ((v.Major == 2 && v.Minor <= CacheV2Minor)) {
+      r.Version = v.Major;
+      break;
+    }
+  }
+  if (!r.Version) {
+    r.Error = NoSupportedVersion(versions);
+  }
+}
+
+Json::Value cmFileAPI::BuildCache(Object const& object)
+{
+  using namespace std::placeholders;
+  Json::Value cache = cmFileAPICacheDump(*this, object.Version);
+  cache["kind"] = this->ObjectKindName(object.Kind);
+
+  Json::Value& version = cache["version"] = Json::objectValue;
+  if (object.Version == 2) {
+    version["major"] = 2;
+    version["minor"] = CacheV2Minor;
+  } else {
+    return cache; // should be unreachable
+  }
+
+  return cache;
+}
+
+// The "cmakeFiles" object kind.
+
+static unsigned int const CMakeFilesV1Minor = 0;
+
+void cmFileAPI::BuildClientRequestCMakeFiles(
+  ClientRequest& r, std::vector<RequestVersion> const& versions)
+{
+  // Select a known version from those requested.
+  for (RequestVersion const& v : versions) {
+    if ((v.Major == 1 && v.Minor <= CMakeFilesV1Minor)) {
+      r.Version = v.Major;
+      break;
+    }
+  }
+  if (!r.Version) {
+    r.Error = NoSupportedVersion(versions);
+  }
+}
+
+Json::Value cmFileAPI::BuildCMakeFiles(Object const& object)
+{
+  using namespace std::placeholders;
+  Json::Value cmakeFiles = cmFileAPICMakeFilesDump(*this, object.Version);
+  cmakeFiles["kind"] = this->ObjectKindName(object.Kind);
+
+  Json::Value& version = cmakeFiles["version"] = Json::objectValue;
+  if (object.Version == 1) {
+    version["major"] = 1;
+    version["minor"] = CMakeFilesV1Minor;
+  } else {
+    return cmakeFiles; // should be unreachable
+  }
+
+  return cmakeFiles;
+}
+
+// The "__test" object kind is for internal testing of CMake.
+
+static unsigned int const InternalTestV1Minor = 3;
+static unsigned int const InternalTestV2Minor = 0;
+
+void cmFileAPI::BuildClientRequestInternalTest(
+  ClientRequest& r, std::vector<RequestVersion> const& versions)
+{
+  // Select a known version from those requested.
+  for (RequestVersion const& v : versions) {
+    if ((v.Major == 1 && v.Minor <= InternalTestV1Minor) || //
+        (v.Major == 2 && v.Minor <= InternalTestV2Minor)) {
+      r.Version = v.Major;
+      break;
+    }
+  }
+  if (!r.Version) {
+    r.Error = NoSupportedVersion(versions);
+  }
+}
+
+Json::Value cmFileAPI::BuildInternalTest(Object const& object)
+{
+  Json::Value test = Json::objectValue;
+  test["kind"] = this->ObjectKindName(object.Kind);
+  Json::Value& version = test["version"] = Json::objectValue;
+  if (object.Version == 2) {
+    version["major"] = 2;
+    version["minor"] = InternalTestV2Minor;
+  } else {
+    version["major"] = 1;
+    version["minor"] = InternalTestV1Minor;
+  }
+  return test;
+}
diff --git a/Source/cmFileAPI.h b/Source/cmFileAPI.h
new file mode 100644
index 0000000..341b072
--- /dev/null
+++ b/Source/cmFileAPI.h
@@ -0,0 +1,204 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cmFileAPI_h
+#define cmFileAPI_h
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include "cm_jsoncpp_reader.h"
+#include "cm_jsoncpp_value.h"
+#include "cm_jsoncpp_writer.h"
+
+#include <map>
+#include <memory> // IWYU pragma: keep
+#include <string>
+#include <unordered_set>
+#include <vector>
+
+class cmake;
+
+class cmFileAPI
+{
+public:
+  cmFileAPI(cmake* cm);
+
+  /** Read fileapi queries from disk.  */
+  void ReadQueries();
+
+  /** Write fileapi replies to disk.  */
+  void WriteReplies();
+
+  /** Get the "cmake" instance with which this was constructed.  */
+  cmake* GetCMakeInstance() const { return this->CMakeInstance; }
+
+  /** Convert a JSON object or array into an object with a single
+      "jsonFile" member specifying a file named with the given prefix
+      and holding the original object.  Other JSON types are unchanged.  */
+  Json::Value MaybeJsonFile(Json::Value in, std::string const& prefix);
+
+private:
+  cmake* CMakeInstance;
+
+  /** The api/v1 directory location.  */
+  std::string APIv1;
+
+  /** The set of files we have just written to the reply directory.  */
+  std::unordered_set<std::string> ReplyFiles;
+
+  static std::vector<std::string> LoadDir(std::string const& dir);
+  void RemoveOldReplyFiles();
+
+  // Keep in sync with ObjectKindName.
+  enum class ObjectKind
+  {
+    CodeModel,
+    Cache,
+    CMakeFiles,
+    InternalTest
+  };
+
+  /** Identify one object kind and major version.  */
+  struct Object
+  {
+    ObjectKind Kind;
+    unsigned long Version = 0;
+    friend bool operator<(Object const& l, Object const& r)
+    {
+      if (l.Kind != r.Kind) {
+        return l.Kind < r.Kind;
+      }
+      return l.Version < r.Version;
+    }
+  };
+
+  /** Represent content of a query directory.  */
+  struct Query
+  {
+    /** Known object kind-version pairs.  */
+    std::vector<Object> Known;
+    /** Unknown object kind names.  */
+    std::vector<std::string> Unknown;
+  };
+
+  /** Represent one request in a client 'query.json'.  */
+  struct ClientRequest : public Object
+  {
+    /** Empty if request is valid, else the error string.  */
+    std::string Error;
+  };
+
+  /** Represent the "requests" in a client 'query.json'.  */
+  struct ClientRequests : public std::vector<ClientRequest>
+  {
+    /** Empty if requests field is valid, else the error string.  */
+    std::string Error;
+  };
+
+  /** Represent the content of a client query.json file.  */
+  struct ClientQueryJson
+  {
+    /** The error string if parsing failed, else empty.  */
+    std::string Error;
+
+    /** The 'query.json' object "client" member if it exists, else null.  */
+    Json::Value ClientValue;
+
+    /** The 'query.json' object "requests" member if it exists, else null.  */
+    Json::Value RequestsValue;
+
+    /** Requests extracted from 'query.json'.  */
+    ClientRequests Requests;
+  };
+
+  /** Represent content of a client query directory.  */
+  struct ClientQuery
+  {
+    /** The content of the client query directory except 'query.json'.  */
+    Query DirQuery;
+
+    /** True if 'query.json' exists.  */
+    bool HaveQueryJson = false;
+
+    /** The 'query.json' content.  */
+    ClientQueryJson QueryJson;
+  };
+
+  /** Whether the top-level query directory exists at all.  */
+  bool QueryExists = false;
+
+  /** The content of the top-level query directory.  */
+  Query TopQuery;
+
+  /** The content of each "client-$client" query directory.  */
+  std::map<std::string, ClientQuery> ClientQueries;
+
+  /** Reply index object generated for object kind/version.
+      This populates the "objects" field of the reply index.  */
+  std::map<Object, Json::Value> ReplyIndexObjects;
+
+  std::unique_ptr<Json::CharReader> JsonReader;
+  std::unique_ptr<Json::StreamWriter> JsonWriter;
+
+  bool ReadJsonFile(std::string const& file, Json::Value& value,
+                    std::string& error);
+
+  std::string WriteJsonFile(
+    Json::Value const& value, std::string const& prefix,
+    std::string (*computeSuffix)(std::string const&) = ComputeSuffixHash);
+  static std::string ComputeSuffixHash(std::string const&);
+  static std::string ComputeSuffixTime(std::string const&);
+
+  static bool ReadQuery(std::string const& query,
+                        std::vector<Object>& objects);
+  void ReadClient(std::string const& client);
+  void ReadClientQuery(std::string const& client, ClientQueryJson& q);
+
+  Json::Value BuildReplyIndex();
+  Json::Value BuildCMake();
+  Json::Value BuildReply(Query const& q);
+  static Json::Value BuildReplyError(std::string const& error);
+  Json::Value const& AddReplyIndexObject(Object const& o);
+
+  static const char* ObjectKindName(ObjectKind kind);
+  static std::string ObjectName(Object const& o);
+
+  Json::Value BuildObject(Object const& object);
+
+  ClientRequests BuildClientRequests(Json::Value const& requests);
+  ClientRequest BuildClientRequest(Json::Value const& request);
+  Json::Value BuildClientReply(ClientQuery const& q);
+  Json::Value BuildClientReplyResponses(ClientRequests const& requests);
+  Json::Value BuildClientReplyResponse(ClientRequest const& request);
+
+  struct RequestVersion
+  {
+    unsigned int Major = 0;
+    unsigned int Minor = 0;
+  };
+  static bool ReadRequestVersions(Json::Value const& version,
+                                  std::vector<RequestVersion>& versions,
+                                  std::string& error);
+  static bool ReadRequestVersion(Json::Value const& version, bool inArray,
+                                 std::vector<RequestVersion>& result,
+                                 std::string& error);
+  static std::string NoSupportedVersion(
+    std::vector<RequestVersion> const& versions);
+
+  void BuildClientRequestCodeModel(
+    ClientRequest& r, std::vector<RequestVersion> const& versions);
+  Json::Value BuildCodeModel(Object const& object);
+
+  void BuildClientRequestCache(ClientRequest& r,
+                               std::vector<RequestVersion> const& versions);
+  Json::Value BuildCache(Object const& object);
+
+  void BuildClientRequestCMakeFiles(
+    ClientRequest& r, std::vector<RequestVersion> const& versions);
+  Json::Value BuildCMakeFiles(Object const& object);
+
+  void BuildClientRequestInternalTest(
+    ClientRequest& r, std::vector<RequestVersion> const& versions);
+  Json::Value BuildInternalTest(Object const& object);
+};
+
+#endif
diff --git a/Source/cmFileAPICMakeFiles.cxx b/Source/cmFileAPICMakeFiles.cxx
new file mode 100644
index 0000000..799a047
--- /dev/null
+++ b/Source/cmFileAPICMakeFiles.cxx
@@ -0,0 +1,113 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmFileAPICMakeFiles.h"
+
+#include "cmFileAPI.h"
+#include "cmGlobalGenerator.h"
+#include "cmLocalGenerator.h"
+#include "cmMakefile.h"
+#include "cmSystemTools.h"
+#include "cmake.h"
+
+#include "cm_jsoncpp_value.h"
+
+#include <string>
+
+namespace {
+
+class CMakeFiles
+{
+  cmFileAPI& FileAPI;
+  unsigned long Version;
+  std::string CMakeModules;
+  std::string const& TopSource;
+  std::string const& TopBuild;
+  bool OutOfSource;
+
+  Json::Value DumpPaths();
+  Json::Value DumpInputs();
+  Json::Value DumpInput(std::string const& file);
+
+public:
+  CMakeFiles(cmFileAPI& fileAPI, unsigned long version);
+  Json::Value Dump();
+};
+
+CMakeFiles::CMakeFiles(cmFileAPI& fileAPI, unsigned long version)
+  : FileAPI(fileAPI)
+  , Version(version)
+  , CMakeModules(cmSystemTools::GetCMakeRoot() + "/Modules")
+  , TopSource(this->FileAPI.GetCMakeInstance()->GetHomeDirectory())
+  , TopBuild(this->FileAPI.GetCMakeInstance()->GetHomeOutputDirectory())
+  , OutOfSource(TopBuild != TopSource)
+{
+  static_cast<void>(this->Version);
+}
+
+Json::Value CMakeFiles::Dump()
+{
+  Json::Value cmakeFiles = Json::objectValue;
+  cmakeFiles["paths"] = this->DumpPaths();
+  cmakeFiles["inputs"] = DumpInputs();
+  return cmakeFiles;
+}
+
+Json::Value CMakeFiles::DumpPaths()
+{
+  Json::Value paths = Json::objectValue;
+  paths["source"] = this->TopSource;
+  paths["build"] = this->TopBuild;
+  return paths;
+}
+
+Json::Value CMakeFiles::DumpInputs()
+{
+  Json::Value inputs = Json::arrayValue;
+
+  cmGlobalGenerator* gg =
+    this->FileAPI.GetCMakeInstance()->GetGlobalGenerator();
+  for (cmLocalGenerator const* lg : gg->GetLocalGenerators()) {
+    cmMakefile const* mf = lg->GetMakefile();
+    for (std::string const& file : mf->GetListFiles()) {
+      inputs.append(this->DumpInput(file));
+    }
+  }
+
+  return inputs;
+}
+
+Json::Value CMakeFiles::DumpInput(std::string const& file)
+{
+  Json::Value input = Json::objectValue;
+
+  bool const isCMake = cmSystemTools::IsSubDirectory(file, this->CMakeModules);
+  if (isCMake) {
+    input["isCMake"] = true;
+  }
+
+  if (!cmSystemTools::IsSubDirectory(file, this->TopSource) &&
+      !cmSystemTools::IsSubDirectory(file, this->TopBuild)) {
+    input["isExternal"] = true;
+  }
+
+  if (this->OutOfSource &&
+      cmSystemTools::IsSubDirectory(file, this->TopBuild)) {
+    input["isGenerated"] = true;
+  }
+
+  std::string path = file;
+  if (!isCMake && cmSystemTools::IsSubDirectory(path, this->TopSource)) {
+    // Use a relative path within the source directory.
+    path = cmSystemTools::RelativePath(this->TopSource, path);
+  }
+  input["path"] = path;
+
+  return input;
+}
+}
+
+Json::Value cmFileAPICMakeFilesDump(cmFileAPI& fileAPI, unsigned long version)
+{
+  CMakeFiles cmakeFiles(fileAPI, version);
+  return cmakeFiles.Dump();
+}
diff --git a/Source/cmFileAPICMakeFiles.h b/Source/cmFileAPICMakeFiles.h
new file mode 100644
index 0000000..a851c32
--- /dev/null
+++ b/Source/cmFileAPICMakeFiles.h
@@ -0,0 +1,15 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cmFileAPICMakeFiles_h
+#define cmFileAPICMakeFiles_h
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include "cm_jsoncpp_value.h"
+
+class cmFileAPI;
+
+extern Json::Value cmFileAPICMakeFilesDump(cmFileAPI& fileAPI,
+                                           unsigned long version);
+
+#endif
diff --git a/Source/cmFileAPICache.cxx b/Source/cmFileAPICache.cxx
new file mode 100644
index 0000000..074994a
--- /dev/null
+++ b/Source/cmFileAPICache.cxx
@@ -0,0 +1,105 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmFileAPICache.h"
+
+#include "cmFileAPI.h"
+#include "cmState.h"
+#include "cmake.h"
+
+#include "cm_jsoncpp_value.h"
+
+#include <algorithm>
+#include <string>
+#include <vector>
+
+namespace {
+
+class Cache
+{
+  cmFileAPI& FileAPI;
+  unsigned long Version;
+  cmState* State;
+
+  Json::Value DumpEntries();
+  Json::Value DumpEntry(std::string const& name);
+  Json::Value DumpEntryProperties(std::string const& name);
+  Json::Value DumpEntryProperty(std::string const& name,
+                                std::string const& prop);
+
+public:
+  Cache(cmFileAPI& fileAPI, unsigned long version);
+  Json::Value Dump();
+};
+
+Cache::Cache(cmFileAPI& fileAPI, unsigned long version)
+  : FileAPI(fileAPI)
+  , Version(version)
+  , State(this->FileAPI.GetCMakeInstance()->GetState())
+{
+  static_cast<void>(this->Version);
+}
+
+Json::Value Cache::Dump()
+{
+  Json::Value cache = Json::objectValue;
+  cache["entries"] = DumpEntries();
+  return cache;
+}
+
+Json::Value Cache::DumpEntries()
+{
+  Json::Value entries = Json::arrayValue;
+
+  std::vector<std::string> names = this->State->GetCacheEntryKeys();
+  std::sort(names.begin(), names.end());
+
+  for (std::string const& name : names) {
+    entries.append(this->DumpEntry(name));
+  }
+
+  return entries;
+}
+
+Json::Value Cache::DumpEntry(std::string const& name)
+{
+  Json::Value entry = Json::objectValue;
+  entry["name"] = name;
+  entry["type"] =
+    cmState::CacheEntryTypeToString(this->State->GetCacheEntryType(name));
+  entry["value"] = this->State->GetCacheEntryValue(name);
+
+  Json::Value properties = this->DumpEntryProperties(name);
+  if (!properties.empty()) {
+    entry["properties"] = std::move(properties);
+  }
+
+  return entry;
+}
+
+Json::Value Cache::DumpEntryProperties(std::string const& name)
+{
+  Json::Value properties = Json::arrayValue;
+  std::vector<std::string> props =
+    this->State->GetCacheEntryPropertyList(name);
+  std::sort(props.begin(), props.end());
+  for (std::string const& prop : props) {
+    properties.append(this->DumpEntryProperty(name, prop));
+  }
+  return properties;
+}
+
+Json::Value Cache::DumpEntryProperty(std::string const& name,
+                                     std::string const& prop)
+{
+  Json::Value property = Json::objectValue;
+  property["name"] = prop;
+  property["value"] = this->State->GetCacheEntryProperty(name, prop);
+  return property;
+}
+}
+
+Json::Value cmFileAPICacheDump(cmFileAPI& fileAPI, unsigned long version)
+{
+  Cache cache(fileAPI, version);
+  return cache.Dump();
+}
diff --git a/Source/cmFileAPICache.h b/Source/cmFileAPICache.h
new file mode 100644
index 0000000..09d9e1c
--- /dev/null
+++ b/Source/cmFileAPICache.h
@@ -0,0 +1,15 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cmFileAPICache_h
+#define cmFileAPICache_h
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include "cm_jsoncpp_value.h"
+
+class cmFileAPI;
+
+extern Json::Value cmFileAPICacheDump(cmFileAPI& fileAPI,
+                                      unsigned long version);
+
+#endif
diff --git a/Source/cmFileAPICodemodel.cxx b/Source/cmFileAPICodemodel.cxx
new file mode 100644
index 0000000..078d1d5
--- /dev/null
+++ b/Source/cmFileAPICodemodel.cxx
@@ -0,0 +1,1247 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmFileAPICodemodel.h"
+
+#include "cmCryptoHash.h"
+#include "cmFileAPI.h"
+#include "cmGeneratorExpression.h"
+#include "cmGeneratorTarget.h"
+#include "cmGlobalGenerator.h"
+#include "cmInstallGenerator.h"
+#include "cmInstallSubdirectoryGenerator.h"
+#include "cmInstallTargetGenerator.h"
+#include "cmLinkLineComputer.h"
+#include "cmListFileCache.h"
+#include "cmLocalGenerator.h"
+#include "cmMakefile.h"
+#include "cmSourceFile.h"
+#include "cmSourceGroup.h"
+#include "cmState.h"
+#include "cmStateDirectory.h"
+#include "cmStateSnapshot.h"
+#include "cmStateTypes.h"
+#include "cmSystemTools.h"
+#include "cmTarget.h"
+#include "cmTargetDepend.h"
+#include "cmake.h"
+
+#include "cm_jsoncpp_value.h"
+
+#include <algorithm>
+#include <cassert>
+#include <map>
+#include <set>
+#include <string>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+
+namespace {
+
+class Codemodel
+{
+  cmFileAPI& FileAPI;
+  unsigned long Version;
+
+  Json::Value DumpPaths();
+  Json::Value DumpConfigurations();
+  Json::Value DumpConfiguration(std::string const& config);
+
+public:
+  Codemodel(cmFileAPI& fileAPI, unsigned long version);
+  Json::Value Dump();
+};
+
+class CodemodelConfig
+{
+  cmFileAPI& FileAPI;
+  unsigned long Version;
+  std::string const& Config;
+  std::string TopSource;
+  std::string TopBuild;
+
+  struct Directory
+  {
+    cmStateSnapshot Snapshot;
+    cmLocalGenerator const* LocalGenerator = nullptr;
+    Json::Value TargetIndexes = Json::arrayValue;
+    Json::ArrayIndex ProjectIndex;
+    bool HasInstallRule = false;
+  };
+  std::map<cmStateSnapshot, Json::ArrayIndex, cmStateSnapshot::StrictWeakOrder>
+    DirectoryMap;
+  std::vector<Directory> Directories;
+
+  struct Project
+  {
+    cmStateSnapshot Snapshot;
+    static const Json::ArrayIndex NoParentIndex =
+      static_cast<Json::ArrayIndex>(-1);
+    Json::ArrayIndex ParentIndex = NoParentIndex;
+    Json::Value ChildIndexes = Json::arrayValue;
+    Json::Value DirectoryIndexes = Json::arrayValue;
+    Json::Value TargetIndexes = Json::arrayValue;
+  };
+  std::map<cmStateSnapshot, Json::ArrayIndex, cmStateSnapshot::StrictWeakOrder>
+    ProjectMap;
+  std::vector<Project> Projects;
+
+  void ProcessDirectories();
+
+  Json::ArrayIndex GetDirectoryIndex(cmLocalGenerator const* lg);
+  Json::ArrayIndex GetDirectoryIndex(cmStateSnapshot s);
+
+  Json::ArrayIndex AddProject(cmStateSnapshot s);
+
+  Json::Value DumpTargets();
+  Json::Value DumpTarget(cmGeneratorTarget* gt, Json::ArrayIndex ti);
+
+  Json::Value DumpDirectories();
+  Json::Value DumpDirectory(Directory& d);
+
+  Json::Value DumpProjects();
+  Json::Value DumpProject(Project& p);
+
+  Json::Value DumpMinimumCMakeVersion(cmStateSnapshot s);
+
+public:
+  CodemodelConfig(cmFileAPI& fileAPI, unsigned long version,
+                  std::string const& config);
+  Json::Value Dump();
+};
+
+std::string RelativeIfUnder(std::string const& top, std::string const& in)
+{
+  std::string out;
+  if (in == top) {
+    out = ".";
+  } else if (cmSystemTools::IsSubDirectory(in, top)) {
+    out = in.substr(top.size() + 1);
+  } else {
+    out = in;
+  }
+  return out;
+}
+
+std::string TargetId(cmGeneratorTarget const* gt, std::string const& topBuild)
+{
+  cmCryptoHash hasher(cmCryptoHash::AlgoSHA3_256);
+  std::string path = RelativeIfUnder(
+    topBuild, gt->GetLocalGenerator()->GetCurrentBinaryDirectory());
+  std::string hash = hasher.HashString(path);
+  hash.resize(20, '0');
+  return gt->GetName() + CMAKE_DIRECTORY_ID_SEP + hash;
+}
+
+class BacktraceData
+{
+  std::string TopSource;
+  std::unordered_map<std::string, Json::ArrayIndex> CommandMap;
+  std::unordered_map<std::string, Json::ArrayIndex> FileMap;
+  std::unordered_map<cmListFileContext const*, Json::ArrayIndex> NodeMap;
+  Json::Value Commands = Json::arrayValue;
+  Json::Value Files = Json::arrayValue;
+  Json::Value Nodes = Json::arrayValue;
+
+  Json::ArrayIndex AddCommand(std::string const& command)
+  {
+    auto i = this->CommandMap.find(command);
+    if (i == this->CommandMap.end()) {
+      auto cmdIndex = static_cast<Json::ArrayIndex>(this->Commands.size());
+      i = this->CommandMap.emplace(command, cmdIndex).first;
+      this->Commands.append(command);
+    }
+    return i->second;
+  }
+
+  Json::ArrayIndex AddFile(std::string const& file)
+  {
+    auto i = this->FileMap.find(file);
+    if (i == this->FileMap.end()) {
+      auto fileIndex = static_cast<Json::ArrayIndex>(this->Files.size());
+      i = this->FileMap.emplace(file, fileIndex).first;
+      this->Files.append(RelativeIfUnder(this->TopSource, file));
+    }
+    return i->second;
+  }
+
+public:
+  BacktraceData(std::string const& topSource);
+  bool Add(cmListFileBacktrace const& bt, Json::ArrayIndex& index);
+  Json::Value Dump();
+};
+
+BacktraceData::BacktraceData(std::string const& topSource)
+  : TopSource(topSource)
+{
+}
+
+bool BacktraceData::Add(cmListFileBacktrace const& bt, Json::ArrayIndex& index)
+{
+  if (bt.Empty()) {
+    return false;
+  }
+  cmListFileContext const* top = &bt.Top();
+  auto found = this->NodeMap.find(top);
+  if (found != this->NodeMap.end()) {
+    index = found->second;
+    return true;
+  }
+  Json::Value entry = Json::objectValue;
+  entry["file"] = this->AddFile(top->FilePath);
+  if (top->Line) {
+    entry["line"] = static_cast<int>(top->Line);
+  }
+  if (!top->Name.empty()) {
+    entry["command"] = this->AddCommand(top->Name);
+  }
+  Json::ArrayIndex parent;
+  if (this->Add(bt.Pop(), parent)) {
+    entry["parent"] = parent;
+  }
+  index = this->NodeMap[top] = this->Nodes.size();
+  this->Nodes.append(std::move(entry)); // NOLINT(*)
+  return true;
+}
+
+Json::Value BacktraceData::Dump()
+{
+  Json::Value backtraceGraph;
+  this->CommandMap.clear();
+  this->FileMap.clear();
+  this->NodeMap.clear();
+  backtraceGraph["commands"] = std::move(this->Commands);
+  backtraceGraph["files"] = std::move(this->Files);
+  backtraceGraph["nodes"] = std::move(this->Nodes);
+  return backtraceGraph;
+}
+
+struct CompileData
+{
+  struct IncludeEntry
+  {
+    BT<std::string> Path;
+    bool IsSystem = false;
+    IncludeEntry(BT<std::string> path, bool isSystem)
+      : Path(std::move(path))
+      , IsSystem(isSystem)
+    {
+    }
+  };
+
+  void SetDefines(std::set<BT<std::string>> const& defines);
+
+  std::string Language;
+  std::string Sysroot;
+  std::vector<BT<std::string>> Flags;
+  std::vector<BT<std::string>> Defines;
+  std::vector<IncludeEntry> Includes;
+};
+
+void CompileData::SetDefines(std::set<BT<std::string>> const& defines)
+{
+  this->Defines.reserve(defines.size());
+  for (BT<std::string> const& d : defines) {
+    this->Defines.push_back(d);
+  }
+}
+
+class Target
+{
+  cmGeneratorTarget* GT;
+  std::string const& Config;
+  std::string TopSource;
+  std::string TopBuild;
+  std::vector<cmSourceGroup> SourceGroupsLocal;
+  BacktraceData Backtraces;
+
+  std::map<std::string, CompileData> CompileDataMap;
+
+  std::unordered_map<cmSourceFile const*, Json::ArrayIndex> SourceMap;
+  Json::Value Sources = Json::arrayValue;
+
+  struct SourceGroup
+  {
+    std::string Name;
+    Json::Value SourceIndexes = Json::arrayValue;
+  };
+  std::unordered_map<cmSourceGroup const*, Json::ArrayIndex> SourceGroupsMap;
+  std::vector<SourceGroup> SourceGroups;
+
+  struct CompileGroup
+  {
+    std::map<Json::Value, Json::ArrayIndex>::iterator Entry;
+    Json::Value SourceIndexes = Json::arrayValue;
+  };
+  std::map<Json::Value, Json::ArrayIndex> CompileGroupMap;
+  std::vector<CompileGroup> CompileGroups;
+
+  void ProcessLanguages();
+  void ProcessLanguage(std::string const& lang);
+
+  Json::ArrayIndex AddSourceGroup(cmSourceGroup* sg, Json::ArrayIndex si);
+  CompileData BuildCompileData(cmSourceFile* sf);
+  Json::ArrayIndex AddSourceCompileGroup(cmSourceFile* sf,
+                                         Json::ArrayIndex si);
+  void AddBacktrace(Json::Value& object, cmListFileBacktrace const& bt);
+  Json::Value DumpPaths();
+  Json::Value DumpCompileData(CompileData cd);
+  Json::Value DumpInclude(CompileData::IncludeEntry const& inc);
+  Json::Value DumpDefine(BT<std::string> const& def);
+  Json::Value DumpSources();
+  Json::Value DumpSource(cmGeneratorTarget::SourceAndKind const& sk,
+                         Json::ArrayIndex si);
+  Json::Value DumpSourceGroups();
+  Json::Value DumpSourceGroup(SourceGroup& sg);
+  Json::Value DumpCompileGroups();
+  Json::Value DumpCompileGroup(CompileGroup& cg);
+  Json::Value DumpSysroot(std::string const& path);
+  Json::Value DumpInstall();
+  Json::Value DumpInstallPrefix();
+  Json::Value DumpInstallDestinations();
+  Json::Value DumpInstallDestination(cmInstallTargetGenerator* itGen);
+  Json::Value DumpArtifacts();
+  Json::Value DumpLink();
+  Json::Value DumpArchive();
+  Json::Value DumpLinkCommandFragments();
+  Json::Value DumpCommandFragments(std::vector<BT<std::string>> const& frags);
+  Json::Value DumpCommandFragment(BT<std::string> const& frag,
+                                  std::string const& role = std::string());
+  Json::Value DumpDependencies();
+  Json::Value DumpDependency(cmTargetDepend const& td);
+  Json::Value DumpFolder();
+
+public:
+  Target(cmGeneratorTarget* gt, std::string const& config);
+  Json::Value Dump();
+};
+
+Codemodel::Codemodel(cmFileAPI& fileAPI, unsigned long version)
+  : FileAPI(fileAPI)
+  , Version(version)
+{
+}
+
+Json::Value Codemodel::Dump()
+{
+  Json::Value codemodel = Json::objectValue;
+
+  codemodel["paths"] = this->DumpPaths();
+  codemodel["configurations"] = this->DumpConfigurations();
+
+  return codemodel;
+}
+
+Json::Value Codemodel::DumpPaths()
+{
+  Json::Value paths = Json::objectValue;
+  paths["source"] = this->FileAPI.GetCMakeInstance()->GetHomeDirectory();
+  paths["build"] = this->FileAPI.GetCMakeInstance()->GetHomeOutputDirectory();
+  return paths;
+}
+
+Json::Value Codemodel::DumpConfigurations()
+{
+  std::vector<std::string> configs;
+  cmGlobalGenerator* gg =
+    this->FileAPI.GetCMakeInstance()->GetGlobalGenerator();
+  auto makefiles = gg->GetMakefiles();
+  if (!makefiles.empty()) {
+    makefiles[0]->GetConfigurations(configs);
+    if (configs.empty()) {
+      configs.emplace_back();
+    }
+  }
+  Json::Value configurations = Json::arrayValue;
+  for (std::string const& config : configs) {
+    configurations.append(this->DumpConfiguration(config));
+  }
+  return configurations;
+}
+
+Json::Value Codemodel::DumpConfiguration(std::string const& config)
+{
+  CodemodelConfig configuration(this->FileAPI, this->Version, config);
+  return configuration.Dump();
+}
+
+CodemodelConfig::CodemodelConfig(cmFileAPI& fileAPI, unsigned long version,
+                                 std::string const& config)
+  : FileAPI(fileAPI)
+  , Version(version)
+  , Config(config)
+  , TopSource(this->FileAPI.GetCMakeInstance()->GetHomeDirectory())
+  , TopBuild(this->FileAPI.GetCMakeInstance()->GetHomeOutputDirectory())
+{
+  static_cast<void>(this->Version);
+}
+
+Json::Value CodemodelConfig::Dump()
+{
+  Json::Value configuration = Json::objectValue;
+  configuration["name"] = this->Config;
+  this->ProcessDirectories();
+  configuration["targets"] = this->DumpTargets();
+  configuration["directories"] = this->DumpDirectories();
+  configuration["projects"] = this->DumpProjects();
+  return configuration;
+}
+
+void CodemodelConfig::ProcessDirectories()
+{
+  cmGlobalGenerator* gg =
+    this->FileAPI.GetCMakeInstance()->GetGlobalGenerator();
+  std::vector<cmLocalGenerator*> const& localGens = gg->GetLocalGenerators();
+
+  // Add directories in forward order to process parents before children.
+  this->Directories.reserve(localGens.size());
+  for (cmLocalGenerator* lg : localGens) {
+    auto directoryIndex =
+      static_cast<Json::ArrayIndex>(this->Directories.size());
+    this->Directories.emplace_back();
+    Directory& d = this->Directories[directoryIndex];
+    d.Snapshot = lg->GetStateSnapshot().GetBuildsystemDirectory();
+    d.LocalGenerator = lg;
+    this->DirectoryMap[d.Snapshot] = directoryIndex;
+
+    d.ProjectIndex = this->AddProject(d.Snapshot);
+    this->Projects[d.ProjectIndex].DirectoryIndexes.append(directoryIndex);
+  }
+
+  // Update directories in reverse order to process children before parents.
+  for (auto di = this->Directories.rbegin(); di != this->Directories.rend();
+       ++di) {
+    Directory& d = *di;
+
+    // Accumulate the presence of install rules on the way up.
+    for (auto gen : d.LocalGenerator->GetMakefile()->GetInstallGenerators()) {
+      if (!dynamic_cast<cmInstallSubdirectoryGenerator*>(gen)) {
+        d.HasInstallRule = true;
+        break;
+      }
+    }
+    if (!d.HasInstallRule) {
+      for (cmStateSnapshot const& child : d.Snapshot.GetChildren()) {
+        cmStateSnapshot childDir = child.GetBuildsystemDirectory();
+        Json::ArrayIndex const childIndex = this->GetDirectoryIndex(childDir);
+        if (this->Directories[childIndex].HasInstallRule) {
+          d.HasInstallRule = true;
+          break;
+        }
+      }
+    }
+  }
+}
+
+Json::ArrayIndex CodemodelConfig::GetDirectoryIndex(cmLocalGenerator const* lg)
+{
+  return this->GetDirectoryIndex(
+    lg->GetStateSnapshot().GetBuildsystemDirectory());
+}
+
+Json::ArrayIndex CodemodelConfig::GetDirectoryIndex(cmStateSnapshot s)
+{
+  auto i = this->DirectoryMap.find(s);
+  assert(i != this->DirectoryMap.end());
+  return i->second;
+}
+
+Json::ArrayIndex CodemodelConfig::AddProject(cmStateSnapshot s)
+{
+  cmStateSnapshot ps = s.GetBuildsystemDirectoryParent();
+  if (ps.IsValid() && ps.GetProjectName() == s.GetProjectName()) {
+    // This directory is part of its parent directory project.
+    Json::ArrayIndex const parentDirIndex = this->GetDirectoryIndex(ps);
+    return this->Directories[parentDirIndex].ProjectIndex;
+  }
+
+  // This directory starts a new project.
+  auto projectIndex = static_cast<Json::ArrayIndex>(this->Projects.size());
+  this->Projects.emplace_back();
+  Project& p = this->Projects[projectIndex];
+  p.Snapshot = s;
+  this->ProjectMap[s] = projectIndex;
+  if (ps.IsValid()) {
+    Json::ArrayIndex const parentDirIndex = this->GetDirectoryIndex(ps);
+    p.ParentIndex = this->Directories[parentDirIndex].ProjectIndex;
+    this->Projects[p.ParentIndex].ChildIndexes.append(projectIndex);
+  }
+  return projectIndex;
+}
+
+Json::Value CodemodelConfig::DumpTargets()
+{
+  Json::Value targets = Json::arrayValue;
+
+  std::vector<cmGeneratorTarget*> targetList;
+  cmGlobalGenerator* gg =
+    this->FileAPI.GetCMakeInstance()->GetGlobalGenerator();
+  for (cmLocalGenerator const* lg : gg->GetLocalGenerators()) {
+    std::vector<cmGeneratorTarget*> const& list = lg->GetGeneratorTargets();
+    targetList.insert(targetList.end(), list.begin(), list.end());
+  }
+  std::sort(targetList.begin(), targetList.end(),
+            [](cmGeneratorTarget* l, cmGeneratorTarget* r) {
+              return l->GetName() < r->GetName();
+            });
+
+  for (cmGeneratorTarget* gt : targetList) {
+    if (gt->GetType() == cmStateEnums::GLOBAL_TARGET ||
+        gt->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+      continue;
+    }
+
+    targets.append(this->DumpTarget(gt, targets.size()));
+  }
+
+  return targets;
+}
+
+Json::Value CodemodelConfig::DumpTarget(cmGeneratorTarget* gt,
+                                        Json::ArrayIndex ti)
+{
+  Target t(gt, this->Config);
+  std::string prefix = "target-" + gt->GetName();
+  if (!this->Config.empty()) {
+    prefix += "-" + this->Config;
+  }
+  Json::Value target = this->FileAPI.MaybeJsonFile(t.Dump(), prefix);
+  target["name"] = gt->GetName();
+  target["id"] = TargetId(gt, this->TopBuild);
+
+  // Cross-reference directory containing target.
+  Json::ArrayIndex di = this->GetDirectoryIndex(gt->GetLocalGenerator());
+  target["directoryIndex"] = di;
+  this->Directories[di].TargetIndexes.append(ti);
+
+  // Cross-reference project containing target.
+  Json::ArrayIndex pi = this->Directories[di].ProjectIndex;
+  target["projectIndex"] = pi;
+  this->Projects[pi].TargetIndexes.append(ti);
+
+  return target;
+}
+
+Json::Value CodemodelConfig::DumpDirectories()
+{
+  Json::Value directories = Json::arrayValue;
+  for (Directory& d : this->Directories) {
+    directories.append(this->DumpDirectory(d));
+  }
+  return directories;
+}
+
+Json::Value CodemodelConfig::DumpDirectory(Directory& d)
+{
+  Json::Value directory = Json::objectValue;
+
+  std::string sourceDir = d.Snapshot.GetDirectory().GetCurrentSource();
+  directory["source"] = RelativeIfUnder(this->TopSource, sourceDir);
+
+  std::string buildDir = d.Snapshot.GetDirectory().GetCurrentBinary();
+  directory["build"] = RelativeIfUnder(this->TopBuild, buildDir);
+
+  cmStateSnapshot parentDir = d.Snapshot.GetBuildsystemDirectoryParent();
+  if (parentDir.IsValid()) {
+    directory["parentIndex"] = this->GetDirectoryIndex(parentDir);
+  }
+
+  Json::Value childIndexes = Json::arrayValue;
+  for (cmStateSnapshot const& child : d.Snapshot.GetChildren()) {
+    childIndexes.append(
+      this->GetDirectoryIndex(child.GetBuildsystemDirectory()));
+  }
+  if (!childIndexes.empty()) {
+    directory["childIndexes"] = std::move(childIndexes);
+  }
+
+  directory["projectIndex"] = d.ProjectIndex;
+
+  if (!d.TargetIndexes.empty()) {
+    directory["targetIndexes"] = std::move(d.TargetIndexes);
+  }
+
+  Json::Value minimumCMakeVersion = this->DumpMinimumCMakeVersion(d.Snapshot);
+  if (!minimumCMakeVersion.isNull()) {
+    directory["minimumCMakeVersion"] = std::move(minimumCMakeVersion);
+  }
+
+  if (d.HasInstallRule) {
+    directory["hasInstallRule"] = true;
+  }
+
+  return directory;
+}
+
+Json::Value CodemodelConfig::DumpProjects()
+{
+  Json::Value projects = Json::arrayValue;
+  for (Project& p : this->Projects) {
+    projects.append(this->DumpProject(p));
+  }
+  return projects;
+}
+
+Json::Value CodemodelConfig::DumpProject(Project& p)
+{
+  Json::Value project = Json::objectValue;
+
+  project["name"] = p.Snapshot.GetProjectName();
+
+  if (p.ParentIndex != Project::NoParentIndex) {
+    project["parentIndex"] = p.ParentIndex;
+  }
+
+  if (!p.ChildIndexes.empty()) {
+    project["childIndexes"] = std::move(p.ChildIndexes);
+  }
+
+  project["directoryIndexes"] = std::move(p.DirectoryIndexes);
+
+  if (!p.TargetIndexes.empty()) {
+    project["targetIndexes"] = std::move(p.TargetIndexes);
+  }
+
+  return project;
+}
+
+Json::Value CodemodelConfig::DumpMinimumCMakeVersion(cmStateSnapshot s)
+{
+  Json::Value minimumCMakeVersion;
+  if (std::string const* def =
+        s.GetDefinition("CMAKE_MINIMUM_REQUIRED_VERSION")) {
+    minimumCMakeVersion = Json::objectValue;
+    minimumCMakeVersion["string"] = *def;
+  }
+  return minimumCMakeVersion;
+}
+
+Target::Target(cmGeneratorTarget* gt, std::string const& config)
+  : GT(gt)
+  , Config(config)
+  , TopSource(gt->GetGlobalGenerator()->GetCMakeInstance()->GetHomeDirectory())
+  , TopBuild(
+      gt->GetGlobalGenerator()->GetCMakeInstance()->GetHomeOutputDirectory())
+  , SourceGroupsLocal(this->GT->Makefile->GetSourceGroups())
+  , Backtraces(this->TopSource)
+{
+}
+
+Json::Value Target::Dump()
+{
+  Json::Value target = Json::objectValue;
+
+  cmStateEnums::TargetType const type = this->GT->GetType();
+
+  target["name"] = this->GT->GetName();
+  target["type"] = cmState::GetTargetTypeName(type);
+  target["id"] = TargetId(this->GT, this->TopBuild);
+  target["paths"] = this->DumpPaths();
+  if (this->GT->Target->GetIsGeneratorProvided()) {
+    target["isGeneratorProvided"] = true;
+  }
+
+  this->AddBacktrace(target, this->GT->GetBacktrace());
+
+  if (this->GT->Target->GetHaveInstallRule()) {
+    target["install"] = this->DumpInstall();
+  }
+
+  if (this->GT->HaveWellDefinedOutputFiles()) {
+    Json::Value artifacts = this->DumpArtifacts();
+    if (!artifacts.empty()) {
+      target["artifacts"] = std::move(artifacts);
+    }
+  }
+
+  if (type == cmStateEnums::EXECUTABLE ||
+      type == cmStateEnums::SHARED_LIBRARY ||
+      type == cmStateEnums::MODULE_LIBRARY) {
+    target["nameOnDisk"] = this->GT->GetFullName(this->Config);
+    target["link"] = this->DumpLink();
+  } else if (type == cmStateEnums::STATIC_LIBRARY) {
+    target["nameOnDisk"] = this->GT->GetFullName(this->Config);
+    target["archive"] = this->DumpArchive();
+  }
+
+  Json::Value dependencies = this->DumpDependencies();
+  if (!dependencies.empty()) {
+    target["dependencies"] = dependencies;
+  }
+
+  {
+    this->ProcessLanguages();
+
+    target["sources"] = this->DumpSources();
+
+    Json::Value folder = this->DumpFolder();
+    if (!folder.isNull()) {
+      target["folder"] = std::move(folder);
+    }
+
+    Json::Value sourceGroups = this->DumpSourceGroups();
+    if (!sourceGroups.empty()) {
+      target["sourceGroups"] = std::move(sourceGroups);
+    }
+
+    Json::Value compileGroups = this->DumpCompileGroups();
+    if (!compileGroups.empty()) {
+      target["compileGroups"] = std::move(compileGroups);
+    }
+  }
+
+  target["backtraceGraph"] = this->Backtraces.Dump();
+
+  return target;
+}
+
+void Target::ProcessLanguages()
+{
+  std::set<std::string> languages;
+  this->GT->GetLanguages(languages, this->Config);
+  for (std::string const& lang : languages) {
+    this->ProcessLanguage(lang);
+  }
+}
+
+void Target::ProcessLanguage(std::string const& lang)
+{
+  CompileData& cd = this->CompileDataMap[lang];
+  cd.Language = lang;
+  if (const char* sysrootCompile =
+        this->GT->Makefile->GetDefinition("CMAKE_SYSROOT_COMPILE")) {
+    cd.Sysroot = sysrootCompile;
+  } else if (const char* sysroot =
+               this->GT->Makefile->GetDefinition("CMAKE_SYSROOT")) {
+    cd.Sysroot = sysroot;
+  }
+  cmLocalGenerator* lg = this->GT->GetLocalGenerator();
+  {
+    // FIXME: Add flags from end section of ExpandRuleVariable,
+    // which may need to be factored out.
+    std::string flags;
+    lg->GetTargetCompileFlags(this->GT, this->Config, lang, flags);
+    cd.Flags.emplace_back(std::move(flags), cmListFileBacktrace());
+  }
+  std::set<BT<std::string>> defines =
+    lg->GetTargetDefines(this->GT, this->Config, lang);
+  cd.SetDefines(defines);
+  std::vector<BT<std::string>> includePathList =
+    lg->GetIncludeDirectories(this->GT, lang, this->Config, true);
+  for (BT<std::string> const& i : includePathList) {
+    cd.Includes.emplace_back(
+      i, this->GT->IsSystemIncludeDirectory(i.Value, this->Config, lang));
+  }
+}
+
+Json::ArrayIndex Target::AddSourceGroup(cmSourceGroup* sg, Json::ArrayIndex si)
+{
+  std::unordered_map<cmSourceGroup const*, Json::ArrayIndex>::iterator i =
+    this->SourceGroupsMap.find(sg);
+  if (i == this->SourceGroupsMap.end()) {
+    auto sgIndex = static_cast<Json::ArrayIndex>(this->SourceGroups.size());
+    i = this->SourceGroupsMap.emplace(sg, sgIndex).first;
+    SourceGroup g;
+    g.Name = sg->GetFullName();
+    this->SourceGroups.push_back(std::move(g));
+  }
+  this->SourceGroups[i->second].SourceIndexes.append(si);
+  return i->second;
+}
+
+CompileData Target::BuildCompileData(cmSourceFile* sf)
+{
+  CompileData fd;
+
+  fd.Language = sf->GetLanguage();
+  if (fd.Language.empty()) {
+    return fd;
+  }
+  CompileData const& cd = this->CompileDataMap.at(fd.Language);
+
+  fd.Sysroot = cd.Sysroot;
+
+  cmLocalGenerator* lg = this->GT->GetLocalGenerator();
+  cmGeneratorExpressionInterpreter genexInterpreter(lg, this->Config, this->GT,
+                                                    fd.Language);
+
+  fd.Flags = cd.Flags;
+  const std::string COMPILE_FLAGS("COMPILE_FLAGS");
+  if (const char* cflags = sf->GetProperty(COMPILE_FLAGS)) {
+    std::string flags = genexInterpreter.Evaluate(cflags, COMPILE_FLAGS);
+    fd.Flags.emplace_back(std::move(flags), cmListFileBacktrace());
+  }
+  const std::string COMPILE_OPTIONS("COMPILE_OPTIONS");
+  if (const char* coptions = sf->GetProperty(COMPILE_OPTIONS)) {
+    std::string flags;
+    lg->AppendCompileOptions(
+      flags, genexInterpreter.Evaluate(coptions, COMPILE_OPTIONS));
+    fd.Flags.emplace_back(std::move(flags), cmListFileBacktrace());
+  }
+
+  // Add include directories from source file properties.
+  {
+    std::vector<std::string> includes;
+    const std::string INCLUDE_DIRECTORIES("INCLUDE_DIRECTORIES");
+    if (const char* cincludes = sf->GetProperty(INCLUDE_DIRECTORIES)) {
+      const std::string& evaluatedIncludes =
+        genexInterpreter.Evaluate(cincludes, INCLUDE_DIRECTORIES);
+      lg->AppendIncludeDirectories(includes, evaluatedIncludes, *sf);
+
+      for (std::string const& include : includes) {
+        bool const isSystemInclude = this->GT->IsSystemIncludeDirectory(
+          include, this->Config, fd.Language);
+        fd.Includes.emplace_back(include, isSystemInclude);
+      }
+    }
+  }
+  fd.Includes.insert(fd.Includes.end(), cd.Includes.begin(),
+                     cd.Includes.end());
+
+  const std::string COMPILE_DEFINITIONS("COMPILE_DEFINITIONS");
+  std::set<std::string> fileDefines;
+  if (const char* defs = sf->GetProperty(COMPILE_DEFINITIONS)) {
+    lg->AppendDefines(fileDefines,
+                      genexInterpreter.Evaluate(defs, COMPILE_DEFINITIONS));
+  }
+
+  const std::string defPropName =
+    "COMPILE_DEFINITIONS_" + cmSystemTools::UpperCase(this->Config);
+  if (const char* config_defs = sf->GetProperty(defPropName)) {
+    lg->AppendDefines(
+      fileDefines,
+      genexInterpreter.Evaluate(config_defs, COMPILE_DEFINITIONS));
+  }
+
+  std::set<BT<std::string>> defines;
+  defines.insert(fileDefines.begin(), fileDefines.end());
+  defines.insert(cd.Defines.begin(), cd.Defines.end());
+
+  fd.SetDefines(defines);
+
+  return fd;
+}
+
+Json::ArrayIndex Target::AddSourceCompileGroup(cmSourceFile* sf,
+                                               Json::ArrayIndex si)
+{
+  Json::Value compileDataJson =
+    this->DumpCompileData(this->BuildCompileData(sf));
+  std::map<Json::Value, Json::ArrayIndex>::iterator i =
+    this->CompileGroupMap.find(compileDataJson);
+  if (i == this->CompileGroupMap.end()) {
+    Json::ArrayIndex cgIndex =
+      static_cast<Json::ArrayIndex>(this->CompileGroups.size());
+    i =
+      this->CompileGroupMap.emplace(std::move(compileDataJson), cgIndex).first;
+    CompileGroup g;
+    g.Entry = i;
+    this->CompileGroups.push_back(std::move(g));
+  }
+  this->CompileGroups[i->second].SourceIndexes.append(si);
+  return i->second;
+}
+
+void Target::AddBacktrace(Json::Value& object, cmListFileBacktrace const& bt)
+{
+  Json::ArrayIndex backtrace;
+  if (this->Backtraces.Add(bt, backtrace)) {
+    object["backtrace"] = backtrace;
+  }
+}
+
+Json::Value Target::DumpPaths()
+{
+  Json::Value paths = Json::objectValue;
+  cmLocalGenerator* lg = this->GT->GetLocalGenerator();
+
+  std::string const& sourceDir = lg->GetCurrentSourceDirectory();
+  paths["source"] = RelativeIfUnder(this->TopSource, sourceDir);
+
+  std::string const& buildDir = lg->GetCurrentBinaryDirectory();
+  paths["build"] = RelativeIfUnder(this->TopBuild, buildDir);
+
+  return paths;
+}
+
+Json::Value Target::DumpSources()
+{
+  Json::Value sources = Json::arrayValue;
+  cmGeneratorTarget::KindedSources const& kinded =
+    this->GT->GetKindedSources(this->Config);
+  for (cmGeneratorTarget::SourceAndKind const& sk : kinded.Sources) {
+    sources.append(this->DumpSource(sk, sources.size()));
+  }
+  return sources;
+}
+
+Json::Value Target::DumpSource(cmGeneratorTarget::SourceAndKind const& sk,
+                               Json::ArrayIndex si)
+{
+  Json::Value source = Json::objectValue;
+
+  std::string const path = sk.Source.Value->GetFullPath();
+  source["path"] = RelativeIfUnder(this->TopSource, path);
+  if (sk.Source.Value->GetPropertyAsBool("GENERATED")) {
+    source["isGenerated"] = true;
+  }
+  this->AddBacktrace(source, sk.Source.Backtrace);
+
+  if (cmSourceGroup* sg =
+        this->GT->Makefile->FindSourceGroup(path, this->SourceGroupsLocal)) {
+    source["sourceGroupIndex"] = this->AddSourceGroup(sg, si);
+  }
+
+  switch (sk.Kind) {
+    case cmGeneratorTarget::SourceKindObjectSource: {
+      source["compileGroupIndex"] =
+        this->AddSourceCompileGroup(sk.Source.Value, si);
+    } break;
+    case cmGeneratorTarget::SourceKindAppManifest:
+    case cmGeneratorTarget::SourceKindCertificate:
+    case cmGeneratorTarget::SourceKindCustomCommand:
+    case cmGeneratorTarget::SourceKindExternalObject:
+    case cmGeneratorTarget::SourceKindExtra:
+    case cmGeneratorTarget::SourceKindHeader:
+    case cmGeneratorTarget::SourceKindIDL:
+    case cmGeneratorTarget::SourceKindManifest:
+    case cmGeneratorTarget::SourceKindModuleDefinition:
+    case cmGeneratorTarget::SourceKindResx:
+    case cmGeneratorTarget::SourceKindXaml:
+      break;
+  }
+
+  return source;
+}
+
+Json::Value Target::DumpCompileData(CompileData cd)
+{
+  Json::Value result = Json::objectValue;
+
+  if (!cd.Language.empty()) {
+    result["language"] = cd.Language;
+  }
+  if (!cd.Sysroot.empty()) {
+    result["sysroot"] = this->DumpSysroot(cd.Sysroot);
+  }
+  if (!cd.Flags.empty()) {
+    result["compileCommandFragments"] = this->DumpCommandFragments(cd.Flags);
+  }
+  if (!cd.Includes.empty()) {
+    Json::Value includes = Json::arrayValue;
+    for (auto const& i : cd.Includes) {
+      includes.append(this->DumpInclude(i));
+    }
+    result["includes"] = includes;
+  }
+  if (!cd.Defines.empty()) {
+    Json::Value defines = Json::arrayValue;
+    for (BT<std::string> const& d : cd.Defines) {
+      defines.append(this->DumpDefine(d));
+    }
+    result["defines"] = std::move(defines);
+  }
+
+  return result;
+}
+
+Json::Value Target::DumpInclude(CompileData::IncludeEntry const& inc)
+{
+  Json::Value include = Json::objectValue;
+  include["path"] = inc.Path.Value;
+  if (inc.IsSystem) {
+    include["isSystem"] = true;
+  }
+  this->AddBacktrace(include, inc.Path.Backtrace);
+  return include;
+}
+
+Json::Value Target::DumpDefine(BT<std::string> const& def)
+{
+  Json::Value define = Json::objectValue;
+  define["define"] = def.Value;
+  this->AddBacktrace(define, def.Backtrace);
+  return define;
+}
+
+Json::Value Target::DumpSourceGroups()
+{
+  Json::Value sourceGroups = Json::arrayValue;
+  for (auto& sg : this->SourceGroups) {
+    sourceGroups.append(this->DumpSourceGroup(sg));
+  }
+  return sourceGroups;
+}
+
+Json::Value Target::DumpSourceGroup(SourceGroup& sg)
+{
+  Json::Value group = Json::objectValue;
+  group["name"] = sg.Name;
+  group["sourceIndexes"] = std::move(sg.SourceIndexes);
+  return group;
+}
+
+Json::Value Target::DumpCompileGroups()
+{
+  Json::Value compileGroups = Json::arrayValue;
+  for (auto& cg : this->CompileGroups) {
+    compileGroups.append(this->DumpCompileGroup(cg));
+  }
+  return compileGroups;
+}
+
+Json::Value Target::DumpCompileGroup(CompileGroup& cg)
+{
+  Json::Value group = cg.Entry->first;
+  group["sourceIndexes"] = std::move(cg.SourceIndexes);
+  return group;
+}
+
+Json::Value Target::DumpSysroot(std::string const& path)
+{
+  Json::Value sysroot = Json::objectValue;
+  sysroot["path"] = path;
+  return sysroot;
+}
+
+Json::Value Target::DumpInstall()
+{
+  Json::Value install = Json::objectValue;
+  install["prefix"] = this->DumpInstallPrefix();
+  install["destinations"] = this->DumpInstallDestinations();
+  return install;
+}
+
+Json::Value Target::DumpInstallPrefix()
+{
+  Json::Value prefix = Json::objectValue;
+  std::string p =
+    this->GT->Makefile->GetSafeDefinition("CMAKE_INSTALL_PREFIX");
+  cmSystemTools::ConvertToUnixSlashes(p);
+  prefix["path"] = p;
+  return prefix;
+}
+
+Json::Value Target::DumpInstallDestinations()
+{
+  Json::Value destinations = Json::arrayValue;
+  auto installGens = this->GT->Makefile->GetInstallGenerators();
+  for (auto iGen : installGens) {
+    auto itGen = dynamic_cast<cmInstallTargetGenerator*>(iGen);
+    if (itGen != nullptr && itGen->GetTarget() == this->GT) {
+      destinations.append(this->DumpInstallDestination(itGen));
+    }
+  }
+  return destinations;
+}
+
+Json::Value Target::DumpInstallDestination(cmInstallTargetGenerator* itGen)
+{
+  Json::Value destination = Json::objectValue;
+  destination["path"] = itGen->GetDestination(this->Config);
+  this->AddBacktrace(destination, itGen->GetBacktrace());
+  return destination;
+}
+
+Json::Value Target::DumpArtifacts()
+{
+  Json::Value artifacts = Json::arrayValue;
+
+  // Object libraries have only object files as artifacts.
+  if (this->GT->GetType() == cmStateEnums::OBJECT_LIBRARY) {
+    if (!this->GT->GetGlobalGenerator()->HasKnownObjectFileLocation(nullptr)) {
+      return artifacts;
+    }
+    std::vector<cmSourceFile const*> objectSources;
+    this->GT->GetObjectSources(objectSources, this->Config);
+    std::string const obj_dir = this->GT->GetObjectDirectory(this->Config);
+    for (cmSourceFile const* sf : objectSources) {
+      const std::string& obj = this->GT->GetObjectName(sf);
+      Json::Value artifact = Json::objectValue;
+      artifact["path"] = RelativeIfUnder(this->TopBuild, obj_dir + obj);
+      artifacts.append(std::move(artifact)); // NOLINT(*)
+    }
+    return artifacts;
+  }
+
+  // Other target types always have a "main" artifact.
+  {
+    Json::Value artifact = Json::objectValue;
+    artifact["path"] =
+      RelativeIfUnder(this->TopBuild,
+                      this->GT->GetFullPath(
+                        this->Config, cmStateEnums::RuntimeBinaryArtifact));
+    artifacts.append(std::move(artifact)); // NOLINT(*)
+  }
+
+  // Add Windows-specific artifacts produced by the linker.
+  if (this->GT->IsDLLPlatform() &&
+      this->GT->GetType() != cmStateEnums::STATIC_LIBRARY) {
+    if (this->GT->GetType() == cmStateEnums::SHARED_LIBRARY ||
+        this->GT->IsExecutableWithExports()) {
+      Json::Value artifact = Json::objectValue;
+      artifact["path"] =
+        RelativeIfUnder(this->TopBuild,
+                        this->GT->GetFullPath(
+                          this->Config, cmStateEnums::ImportLibraryArtifact));
+      artifacts.append(std::move(artifact)); // NOLINT(*)
+    }
+    cmGeneratorTarget::OutputInfo const* output =
+      this->GT->GetOutputInfo(this->Config);
+    if (output && !output->PdbDir.empty()) {
+      Json::Value artifact = Json::objectValue;
+      artifact["path"] = RelativeIfUnder(this->TopBuild,
+                                         output->PdbDir + '/' +
+                                           this->GT->GetPDBName(this->Config));
+      artifacts.append(std::move(artifact)); // NOLINT(*)
+    }
+  }
+  return artifacts;
+}
+
+Json::Value Target::DumpLink()
+{
+  Json::Value link = Json::objectValue;
+  std::string lang = this->GT->GetLinkerLanguage(this->Config);
+  link["language"] = lang;
+  {
+    Json::Value commandFragments = this->DumpLinkCommandFragments();
+    if (!commandFragments.empty()) {
+      link["commandFragments"] = std::move(commandFragments);
+    }
+  }
+  if (const char* sysrootLink =
+        this->GT->Makefile->GetDefinition("CMAKE_SYSROOT_LINK")) {
+    link["sysroot"] = this->DumpSysroot(sysrootLink);
+  } else if (const char* sysroot =
+               this->GT->Makefile->GetDefinition("CMAKE_SYSROOT")) {
+    link["sysroot"] = this->DumpSysroot(sysroot);
+  }
+  if (this->GT->IsIPOEnabled(lang, this->Config)) {
+    link["lto"] = true;
+  }
+  return link;
+}
+
+Json::Value Target::DumpArchive()
+{
+  Json::Value archive = Json::objectValue;
+  {
+    // The "link" fragments not relevant to static libraries are empty.
+    Json::Value commandFragments = this->DumpLinkCommandFragments();
+    if (!commandFragments.empty()) {
+      archive["commandFragments"] = std::move(commandFragments);
+    }
+  }
+  std::string lang = this->GT->GetLinkerLanguage(this->Config);
+  if (this->GT->IsIPOEnabled(lang, this->Config)) {
+    archive["lto"] = true;
+  }
+  return archive;
+}
+
+Json::Value Target::DumpLinkCommandFragments()
+{
+  Json::Value linkFragments = Json::arrayValue;
+
+  std::string linkLanguageFlags;
+  std::string linkFlags;
+  std::string frameworkPath;
+  std::string linkPath;
+  std::string linkLibs;
+  cmLocalGenerator* lg = this->GT->GetLocalGenerator();
+  cmLinkLineComputer linkLineComputer(lg,
+                                      lg->GetStateSnapshot().GetDirectory());
+  lg->GetTargetFlags(&linkLineComputer, this->Config, linkLibs,
+                     linkLanguageFlags, linkFlags, frameworkPath, linkPath,
+                     this->GT);
+  linkLanguageFlags = cmSystemTools::TrimWhitespace(linkLanguageFlags);
+  linkFlags = cmSystemTools::TrimWhitespace(linkFlags);
+  frameworkPath = cmSystemTools::TrimWhitespace(frameworkPath);
+  linkPath = cmSystemTools::TrimWhitespace(linkPath);
+  linkLibs = cmSystemTools::TrimWhitespace(linkLibs);
+
+  if (!linkLanguageFlags.empty()) {
+    linkFragments.append(
+      this->DumpCommandFragment(std::move(linkLanguageFlags), "flags"));
+  }
+
+  if (!linkFlags.empty()) {
+    linkFragments.append(
+      this->DumpCommandFragment(std::move(linkFlags), "flags"));
+  }
+
+  if (!frameworkPath.empty()) {
+    linkFragments.append(
+      this->DumpCommandFragment(std::move(frameworkPath), "frameworkPath"));
+  }
+
+  if (!linkPath.empty()) {
+    linkFragments.append(
+      this->DumpCommandFragment(std::move(linkPath), "libraryPath"));
+  }
+
+  if (!linkLibs.empty()) {
+    linkFragments.append(
+      this->DumpCommandFragment(std::move(linkLibs), "libraries"));
+  }
+
+  return linkFragments;
+}
+
+Json::Value Target::DumpCommandFragments(
+  std::vector<BT<std::string>> const& frags)
+{
+  Json::Value commandFragments = Json::arrayValue;
+  for (BT<std::string> const& f : frags) {
+    commandFragments.append(this->DumpCommandFragment(f));
+  }
+  return commandFragments;
+}
+
+Json::Value Target::DumpCommandFragment(BT<std::string> const& frag,
+                                        std::string const& role)
+{
+  Json::Value fragment = Json::objectValue;
+  fragment["fragment"] = frag.Value;
+  if (!role.empty()) {
+    fragment["role"] = role;
+  }
+  this->AddBacktrace(fragment, frag.Backtrace);
+  return fragment;
+}
+
+Json::Value Target::DumpDependencies()
+{
+  Json::Value dependencies = Json::arrayValue;
+  cmGlobalGenerator* gg = this->GT->GetGlobalGenerator();
+  for (cmTargetDepend const& td : gg->GetTargetDirectDepends(this->GT)) {
+    dependencies.append(this->DumpDependency(td));
+  }
+  return dependencies;
+}
+
+Json::Value Target::DumpDependency(cmTargetDepend const& td)
+{
+  Json::Value dependency = Json::objectValue;
+  dependency["id"] = TargetId(td, this->TopBuild);
+  this->AddBacktrace(dependency, td.GetBacktrace());
+  return dependency;
+}
+
+Json::Value Target::DumpFolder()
+{
+  Json::Value folder;
+  if (const char* f = this->GT->GetProperty("FOLDER")) {
+    folder = Json::objectValue;
+    folder["name"] = f;
+  }
+  return folder;
+}
+}
+
+Json::Value cmFileAPICodemodelDump(cmFileAPI& fileAPI, unsigned long version)
+{
+  Codemodel codemodel(fileAPI, version);
+  return codemodel.Dump();
+}
diff --git a/Source/cmFileAPICodemodel.h b/Source/cmFileAPICodemodel.h
new file mode 100644
index 0000000..ffbd928
--- /dev/null
+++ b/Source/cmFileAPICodemodel.h
@@ -0,0 +1,15 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cmFileAPICodemodel_h
+#define cmFileAPICodemodel_h
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include "cm_jsoncpp_value.h"
+
+class cmFileAPI;
+
+extern Json::Value cmFileAPICodemodelDump(cmFileAPI& fileAPI,
+                                          unsigned long version);
+
+#endif
diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index 8b20db6..35d716c 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -112,6 +112,15 @@
   delete this->ExtraGenerator;
 }
 
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+Json::Value cmGlobalGenerator::GetJson() const
+{
+  Json::Value generator = Json::objectValue;
+  generator["name"] = this->GetName();
+  return generator;
+}
+#endif
+
 bool cmGlobalGenerator::SetGeneratorInstance(std::string const& i,
                                              cmMakefile* mf)
 {
diff --git a/Source/cmGlobalGenerator.h b/Source/cmGlobalGenerator.h
index 1ea2d24..4e6b6de 100644
--- a/Source/cmGlobalGenerator.h
+++ b/Source/cmGlobalGenerator.h
@@ -24,6 +24,7 @@
 
 #if defined(CMAKE_BUILD_WITH_CMAKE)
 #  include "cmFileLockPool.h"
+#  include "cm_jsoncpp_value.h"
 #endif
 
 #define CMAKE_DIRECTORY_ID_SEP "::@"
@@ -70,6 +71,11 @@
     return codecvt::None;
   }
 
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+  /** Get a JSON object describing the generator.  */
+  virtual Json::Value GetJson() const;
+#endif
+
   /** Tell the generator about the target system.  */
   virtual bool SetSystemName(std::string const&, cmMakefile*) { return true; }
 
diff --git a/Source/cmGlobalVisualStudio7Generator.cxx b/Source/cmGlobalVisualStudio7Generator.cxx
index 0b6c149..3648086 100644
--- a/Source/cmGlobalVisualStudio7Generator.cxx
+++ b/Source/cmGlobalVisualStudio7Generator.cxx
@@ -254,6 +254,15 @@
   return lg;
 }
 
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+Json::Value cmGlobalVisualStudio7Generator::GetJson() const
+{
+  Json::Value generator = this->cmGlobalVisualStudioGenerator::GetJson();
+  generator["platform"] = this->GetPlatformName();
+  return generator;
+}
+#endif
+
 std::string const& cmGlobalVisualStudio7Generator::GetPlatformName() const
 {
   if (!this->GeneratorPlatform.empty()) {
diff --git a/Source/cmGlobalVisualStudio7Generator.h b/Source/cmGlobalVisualStudio7Generator.h
index 251478d..59e7a98 100644
--- a/Source/cmGlobalVisualStudio7Generator.h
+++ b/Source/cmGlobalVisualStudio7Generator.h
@@ -28,6 +28,10 @@
   ///! Create a local generator appropriate to this Global Generator
   cmLocalGenerator* CreateLocalGenerator(cmMakefile* mf) override;
 
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+  Json::Value GetJson() const override;
+#endif
+
   bool SetSystemName(std::string const& s, cmMakefile* mf) override;
 
   bool SetGeneratorPlatform(std::string const& p, cmMakefile* mf) override;
diff --git a/Source/cmStateSnapshot.cxx b/Source/cmStateSnapshot.cxx
index c2510f3..a649f5e 100644
--- a/Source/cmStateSnapshot.cxx
+++ b/Source/cmStateSnapshot.cxx
@@ -66,6 +66,12 @@
     : false;
 }
 
+cmStateSnapshot cmStateSnapshot::GetBuildsystemDirectory() const
+{
+  return cmStateSnapshot(this->State,
+                         this->Position->BuildSystemDirectory->DirectoryEnd);
+}
+
 cmStateSnapshot cmStateSnapshot::GetBuildsystemDirectoryParent() const
 {
   cmStateSnapshot snapshot;
diff --git a/Source/cmStateSnapshot.h b/Source/cmStateSnapshot.h
index 014c62e..c315f48 100644
--- a/Source/cmStateSnapshot.h
+++ b/Source/cmStateSnapshot.h
@@ -37,6 +37,7 @@
   std::vector<cmStateSnapshot> GetChildren();
 
   bool IsValid() const;
+  cmStateSnapshot GetBuildsystemDirectory() const;
   cmStateSnapshot GetBuildsystemDirectoryParent() const;
   cmStateSnapshot GetCallStackParent() const;
   cmStateSnapshot GetCallStackBottom() const;
diff --git a/Source/cmString.cxx b/Source/cmString.cxx
new file mode 100644
index 0000000..2a0c125
--- /dev/null
+++ b/Source/cmString.cxx
@@ -0,0 +1,152 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#define _SCL_SECURE_NO_WARNINGS
+
+#include "cmString.hxx"
+
+#include <memory>
+#include <ostream>
+#include <stdexcept>
+#include <string>
+#include <type_traits>
+
+namespace cm {
+
+static std::string const empty_string_;
+
+void String::internally_mutate_to_stable_string()
+{
+  // We assume that only one thread mutates this instance at
+  // a time even if we point to a shared string buffer refernced
+  // by other threads.
+  *this = String(data(), size());
+}
+
+bool String::is_stable() const
+{
+  return str_if_stable() != nullptr;
+}
+
+void String::stabilize()
+{
+  if (is_stable()) {
+    return;
+  }
+  this->internally_mutate_to_stable_string();
+}
+
+std::string const* String::str_if_stable() const
+{
+  if (!data()) {
+    // We view no string.
+    // This is stable for the lifetime of our current value.
+    return &empty_string_;
+  }
+
+  if (string_ && data() == string_->data() && size() == string_->size()) {
+    // We view an entire string.
+    // This is stable for the lifetime of our current value.
+    return string_.get();
+  }
+
+  return nullptr;
+}
+
+std::string const& String::str()
+{
+  if (std::string const* s = str_if_stable()) {
+    return *s;
+  }
+  // Mutate to hold a std::string that is stable for the lifetime
+  // of our current value.
+  this->internally_mutate_to_stable_string();
+  return *string_;
+}
+
+const char* String::c_str()
+{
+  const char* c = data();
+  if (c == nullptr) {
+    return c;
+  }
+
+  // We always point into a null-terminated string so it is safe to
+  // access one past the end.  If it is a null byte then we can use
+  // the pointer directly.
+  if (c[size()] == '\0') {
+    return c;
+  }
+
+  // Mutate to hold a std::string so we can get a null terminator.
+  this->internally_mutate_to_stable_string();
+  c = string_->c_str();
+  return c;
+}
+
+String& String::insert(size_type index, size_type count, char ch)
+{
+  std::string s;
+  s.reserve(size() + count);
+  s.assign(data(), size());
+  s.insert(index, count, ch);
+  return *this = std::move(s);
+}
+
+String& String::erase(size_type index, size_type count)
+{
+  if (index > size()) {
+    throw std::out_of_range("Index out of range in String::erase");
+  }
+  size_type const rcount = std::min(count, size() - index);
+  size_type const rindex = index + rcount;
+  std::string s;
+  s.reserve(size() - rcount);
+  s.assign(data(), index);
+  s.append(data() + rindex, size() - rindex);
+  return *this = std::move(s);
+}
+
+String String::substr(size_type pos, size_type count) const
+{
+  if (pos > size()) {
+    throw std::out_of_range("Index out of range in String::substr");
+  }
+  return String(*this, pos, count);
+}
+
+String::String(std::string&& s, Private)
+  : string_(std::make_shared<std::string>(std::move(s)))
+  , view_(string_->data(), string_->size())
+{
+}
+
+String::size_type String::copy(char* dest, size_type count,
+                               size_type pos) const
+{
+  return view_.copy(dest, count, pos);
+}
+
+std::ostream& operator<<(std::ostream& os, String const& s)
+{
+  return os.write(s.data(), s.size());
+}
+
+std::string& operator+=(std::string& self, String const& s)
+{
+  return self += s.view();
+}
+
+String IntoString<char*>::into_string(const char* s)
+{
+  if (!s) {
+    return String();
+  }
+  return std::string(s);
+}
+
+string_view AsStringView<String>::view(String const& s)
+{
+  return s.view();
+}
+
+} // namespace cm
diff --git a/Source/cmString.hxx b/Source/cmString.hxx
new file mode 100644
index 0000000..1623a43
--- /dev/null
+++ b/Source/cmString.hxx
@@ -0,0 +1,815 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cmString_hxx
+#define cmString_hxx
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include "cm_static_string_view.hxx"
+#include "cm_string_view.hxx"
+
+#include <algorithm>
+#include <functional>
+#include <initializer_list>
+#include <memory>
+#include <ostream>
+#include <string>
+#include <type_traits>
+
+namespace cm {
+
+class String;
+
+/**
+ * Trait to convert type T into a String.
+ * Implementations must derive from 'std::true_type'
+ * and define an 'into_string' member that accepts
+ * type T (by value or reference) and returns one of:
+ *
+ * - 'std::string' to construct an owned instance.
+ * - 'cm::string_view' to construct a borrowed or null instances.
+ *   The buffer from which the view is borrowed must outlive
+ *   all copies of the resulting String, e.g. static storage.
+ * - 'cm::String' for already-constructed instances.
+ */
+template <typename T>
+struct IntoString : std::false_type
+{
+};
+
+template <typename T>
+struct IntoString<T&> : IntoString<T>
+{
+};
+
+template <typename T>
+struct IntoString<T const> : IntoString<T>
+{
+};
+
+template <typename T>
+struct IntoString<T const*> : IntoString<T*>
+{
+};
+
+template <typename T, std::string::size_type N>
+struct IntoString<T const[N]> : IntoString<T[N]>
+{
+};
+
+template <>
+struct IntoString<char*> : std::true_type
+{
+  static String into_string(const char* s);
+};
+
+template <>
+struct IntoString<std::nullptr_t> : std::true_type
+{
+  static string_view into_string(std::nullptr_t) { return string_view(); }
+};
+
+template <std::string::size_type N>
+struct IntoString<char[N]> : std::true_type
+{
+  static std::string into_string(char const (&s)[N])
+  {
+    return std::string(s, N - 1);
+  }
+};
+
+template <>
+struct IntoString<std::string> : std::true_type
+{
+  static std::string into_string(std::string s) { return s; }
+};
+
+template <>
+struct IntoString<string_view> : std::true_type
+{
+  static std::string into_string(string_view s) { return std::string(s); }
+};
+
+template <>
+struct IntoString<static_string_view> : std::true_type
+{
+  static string_view into_string(static_string_view s) { return s; }
+};
+
+template <>
+struct IntoString<char> : std::true_type
+{
+  static std::string into_string(char const& c) { return std::string(1, c); }
+};
+
+/**
+ * Trait to convert type T into a 'cm::string_view'.
+ * Implementations must derive from 'std::true_type' and
+ * define a 'view' member that accepts type T (by reference)
+ * and returns a 'cm::string_view'.
+ */
+template <typename T>
+struct AsStringView : std::false_type
+{
+};
+
+template <typename T>
+struct AsStringView<T&> : AsStringView<T>
+{
+};
+
+template <typename T>
+struct AsStringView<T const> : AsStringView<T>
+{
+};
+
+template <typename T>
+struct AsStringView<T const*> : AsStringView<T*>
+{
+};
+
+template <typename T, std::string::size_type N>
+struct AsStringView<T const[N]> : AsStringView<T[N]>
+{
+};
+
+template <>
+struct AsStringView<char*> : std::true_type
+{
+  static string_view view(const char* s) { return s; }
+};
+
+template <std::string::size_type N>
+struct AsStringView<char[N]> : std::true_type
+{
+  static string_view view(char const (&s)[N]) { return string_view(s, N - 1); }
+};
+
+template <>
+struct AsStringView<std::string> : std::true_type
+{
+  static string_view view(std::string const& s) { return s; }
+};
+
+template <>
+struct AsStringView<char> : std::true_type
+{
+  static string_view view(const char& s) { return string_view(&s, 1); }
+};
+
+template <>
+struct AsStringView<string_view> : std::true_type
+{
+  static string_view view(string_view const& s) { return s; }
+};
+
+template <>
+struct AsStringView<static_string_view> : std::true_type
+{
+  static string_view view(static_string_view const& s) { return s; }
+};
+
+template <>
+struct AsStringView<String> : std::true_type
+{
+  static string_view view(String const& s);
+};
+
+/**
+ * \class String
+ *
+ * A custom string type that holds a view of a string buffer
+ * and optionally shares ownership of the buffer.  Instances
+ * may have one of the following states:
+ *
+ * - null: views and owns nothing.
+ *   Conversion to 'bool' is 'false'.
+ *   'data()' and 'c_str()' return nullptr.
+ *   'size()' returns 0.
+ *   'str()' returns an empty string.
+ *
+ * - borrowed: views a string but does not own it.  This is used
+ *   to bind to static storage (e.g. string literals) or for
+ *   temporary instances that do not outlive the borrowed buffer.
+ *   Copies and substrings still borrow the original buffer.
+ *   Mutation allocates a new internal string and converts to
+ *   the 'owned' state.
+ *   Conversion to 'bool' is 'true'.
+ *   'c_str()' may internally mutate to the 'owned' state.
+ *   'str()' internally mutates to the 'owned' state.
+ *
+ * - owned: views an immutable 'std::string' instance owned internally.
+ *   Copies and substrings share ownership of the internal string.
+ *   Mutation allocates a new internal string.
+ *   Conversion to 'bool' is 'true'.
+ */
+class String
+{
+  enum class Private
+  {
+  };
+
+public:
+  using traits_type = std::string::traits_type;
+  using value_type = string_view::value_type;
+  using pointer = string_view::pointer;
+  using const_pointer = string_view::const_pointer;
+  using reference = string_view::reference;
+  using const_reference = string_view::const_reference;
+  using const_iterator = string_view::const_iterator;
+  using iterator = string_view::const_iterator;
+  using const_reverse_iterator = string_view::const_reverse_iterator;
+  using reverse_iterator = string_view::const_reverse_iterator;
+  using difference_type = string_view::difference_type;
+  using size_type = string_view::size_type;
+
+  static size_type const npos = string_view::npos;
+
+  /** Construct a null string.  */
+  String() = default;
+
+  /** Construct from any type implementing the IntoString trait.  */
+  template <typename T,
+            typename = typename std::enable_if<IntoString<T>::value>::type>
+  String(T&& s)
+    : String(IntoString<T>::into_string(std::forward<T>(s)), Private())
+  {
+  }
+
+  /** Construct via std::string initializer list constructor.  */
+  String(std::initializer_list<char> il)
+    : String(std::string(il))
+  {
+  }
+
+  /** Construct by copying the specified buffer.  */
+  String(const char* d, size_type s)
+    : String(std::string(d, s))
+  {
+  }
+
+  /** Construct by copying from input iterator range.  */
+  template <typename InputIterator>
+  String(InputIterator first, InputIterator last)
+    : String(std::string(first, last))
+  {
+  }
+
+  /** Construct a string with 'n' copies of character 'c'.  */
+  String(size_type n, char c)
+    : String(std::string(n, c))
+  {
+  }
+
+  /** Construct from a substring of another String instance.
+      This shares ownership of the other string's buffer
+      but views only a substring.  */
+  String(String const& s, size_type pos, size_type count = npos)
+    : string_(s.string_)
+    , view_(s.data() + pos, std::min(count, s.size() - pos))
+  {
+  }
+
+  /** Construct by moving from another String instance.
+      The other instance is left as a null string.  */
+  String(String&& s) noexcept
+    : string_(std::move(s.string_))
+    , view_(s.view_)
+  {
+    s.view_ = string_view();
+  }
+
+  /** Construct by copying from another String instance.
+      This shares ownership of the other string's buffer.  */
+  String(String const&) noexcept = default;
+
+  ~String() = default;
+
+  /** Construct by borrowing an externally-owned buffer.  The buffer
+      must outlive the returned instance and all copies of it.  */
+  static String borrow(string_view v) { return String(v, Private()); }
+
+  /** Assign by moving from another String instance.
+      The other instance is left as a null string.  */
+  String& operator=(String&& s) noexcept
+  {
+    string_ = std::move(s.string_);
+    view_ = s.view_;
+    s.view_ = string_view();
+    return *this;
+  }
+
+  /** Assign by copying from another String instance.
+      This shares ownership of the other string's buffer.  */
+  String& operator=(String const&) noexcept = default;
+
+  /** Assign from any type implementing the IntoString trait.  */
+  template <typename T>
+  typename // NOLINT(*)
+    std::enable_if<IntoString<T>::value, String&>::type
+    operator=(T&& s)
+  {
+    *this = String(std::forward<T>(s));
+    return *this;
+  }
+
+  /** Assign via std::string initializer list constructor.  */
+  String& operator=(std::initializer_list<char> il)
+  {
+    *this = String(il);
+    return *this;
+  }
+
+  /** Return true if the instance is not a null string.  */
+  explicit operator bool() const noexcept { return data() != nullptr; }
+
+  /** Return a view of the string.  */
+  string_view view() const noexcept { return view_; }
+
+  /** Return true if the instance is an empty stringn or null string.  */
+  bool empty() const noexcept { return view_.empty(); }
+
+  /** Return a pointer to the start of the string.  */
+  const char* data() const noexcept { return view_.data(); }
+
+  /** Return the length of the string in bytes.  */
+  size_type size() const noexcept { return view_.size(); }
+  size_type length() const noexcept { return view_.length(); }
+
+  /** Return the character at the given position.
+      No bounds checking is performed.  */
+  char operator[](size_type pos) const noexcept { return view_[pos]; }
+
+  /** Return the character at the given position.
+      If the position is out of bounds, throws std::out_of_range.  */
+  char at(size_type pos) const { return view_.at(pos); }
+
+  char front() const noexcept { return view_.front(); }
+
+  char back() const noexcept { return view_.back(); }
+
+  /** Return true if this instance is stable and otherwise false.
+      An instance is stable if it is in the 'null' state or if it is
+      an 'owned' state not produced by substring operations, or
+      after a call to 'stabilize()' or 'str()'.  */
+  bool is_stable() const;
+
+  /** If 'is_stable()' does not return true, mutate so it does.  */
+  void stabilize();
+
+  /** Get a pointer to a normal std::string if 'is_stable()' returns
+      true and otherwise nullptr.  The pointer is valid until this
+      instance is mutated or destroyed.  */
+  std::string const* str_if_stable() const;
+
+  /** Get a refernce to a normal std::string.  The reference
+      is valid until this instance is mutated or destroyed.  */
+  std::string const& str();
+
+  /** Get a pointer to a C-style null-terminated string
+      containing the same value as this instance.  The pointer
+      is valid until this instance is mutated, destroyed,
+      or str() is called.  */
+  const char* c_str();
+
+  const_iterator begin() const noexcept { return view_.begin(); }
+  const_iterator end() const noexcept { return view_.end(); }
+  const_iterator cbegin() const noexcept { return begin(); }
+  const_iterator cend() const noexcept { return end(); }
+
+  const_reverse_iterator rbegin() const noexcept { return view_.rbegin(); }
+  const_reverse_iterator rend() const noexcept { return view_.rend(); }
+  const_reverse_iterator crbegin() const noexcept { return rbegin(); }
+  const_reverse_iterator crend() const noexcept { return rend(); }
+
+  /** Append to the string using any type that implements the
+      AsStringView trait.  */
+  template <typename T>
+  typename std::enable_if<AsStringView<T>::value, String&>::type operator+=(
+    T&& s)
+  {
+    string_view v = AsStringView<T>::view(std::forward<T>(s));
+    std::string r;
+    r.reserve(size() + v.size());
+    r.assign(data(), size());
+    r.append(v.data(), v.size());
+    return *this = std::move(r);
+  }
+
+  /** Assign to an empty string.  */
+  void clear() { *this = ""_s; }
+
+  /** Insert 'count' copies of 'ch' at position 'index'.  */
+  String& insert(size_type index, size_type count, char ch);
+
+  /** Erase 'count' characters starting at position 'index'.  */
+  String& erase(size_type index = 0, size_type count = npos);
+
+  void push_back(char ch)
+  {
+    std::string s;
+    s.reserve(size() + 1);
+    s.assign(data(), size());
+    s.push_back(ch);
+    *this = std::move(s);
+  }
+
+  void pop_back() { *this = String(*this, 0, size() - 1); }
+
+  template <typename T>
+  typename std::enable_if<AsStringView<T>::value, String&>::type replace(
+    size_type pos, size_type count, T&& s)
+  {
+    const_iterator first = begin() + pos;
+    const_iterator last = first + count;
+    return replace(first, last, std::forward<T>(s));
+  }
+
+  template <typename InputIterator>
+  String& replace(const_iterator first, const_iterator last,
+                  InputIterator first2, InputIterator last2)
+  {
+    std::string out;
+    out.append(view_.begin(), first);
+    out.append(first2, last2);
+    out.append(last, view_.end());
+    return *this = std::move(out);
+  }
+
+  template <typename T>
+  typename std::enable_if<AsStringView<T>::value, String&>::type replace(
+    const_iterator first, const_iterator last, T&& s)
+  {
+    string_view v = AsStringView<T>::view(std::forward<T>(s));
+    std::string out;
+    out.reserve((first - view_.begin()) + v.size() + (view_.end() - last));
+    out.append(view_.begin(), first);
+    out.append(v.data(), v.size());
+    out.append(last, view_.end());
+    return *this = std::move(out);
+  }
+
+  template <typename T>
+  typename std::enable_if<AsStringView<T>::value, String&>::type replace(
+    size_type pos, size_type count, T&& s, size_type pos2,
+    size_type count2 = npos)
+  {
+    string_view v = AsStringView<T>::view(std::forward<T>(s));
+    v = v.substr(pos2, count2);
+    return replace(pos, count, v);
+  }
+
+  String& replace(size_type pos, size_type count, size_type count2, char ch)
+  {
+    const_iterator first = begin() + pos;
+    const_iterator last = first + count;
+    return replace(first, last, count2, ch);
+  }
+
+  String& replace(const_iterator first, const_iterator last, size_type count2,
+                  char ch)
+  {
+    std::string out;
+    out.reserve((first - view_.begin()) + count2 + (view_.end() - last));
+    out.append(view_.begin(), first);
+    out.append(count2, ch);
+    out.append(last, view_.end());
+    return *this = std::move(out);
+  }
+
+  size_type copy(char* dest, size_type count, size_type pos = 0) const;
+
+  void resize(size_type count) { resize(count, char()); }
+
+  void resize(size_type count, char ch)
+  {
+    std::string s;
+    s.reserve(count);
+    if (count <= size()) {
+      s.assign(data(), count);
+    } else {
+      s.assign(data(), size());
+      s.resize(count, ch);
+    }
+    *this = std::move(s);
+  }
+
+  void swap(String& other)
+  {
+    std::swap(string_, other.string_);
+    std::swap(view_, other.view_);
+  }
+
+  /** Return a substring starting at position 'pos' and
+      consisting of at most 'count' characters.  */
+  String substr(size_type pos = 0, size_type count = npos) const;
+
+  template <typename T>
+  typename std::enable_if<AsStringView<T>::value, int>::type compare(
+    T&& s) const
+  {
+    return view_.compare(AsStringView<T>::view(std::forward<T>(s)));
+  }
+
+  int compare(size_type pos1, size_type count1, string_view v) const
+  {
+    return view_.compare(pos1, count1, v);
+  }
+
+  int compare(size_type pos1, size_type count1, string_view v, size_type pos2,
+              size_type count2) const
+  {
+    return view_.compare(pos1, count1, v, pos2, count2);
+  }
+
+  int compare(size_type pos1, size_type count1, const char* s) const
+  {
+    return view_.compare(pos1, count1, s);
+  }
+
+  int compare(size_type pos1, size_type count1, const char* s,
+              size_type count2) const
+  {
+    return view_.compare(pos1, count1, s, count2);
+  }
+
+  template <typename T>
+  typename std::enable_if<AsStringView<T>::value, size_type>::type find(
+    T&& s, size_type pos = 0) const
+  {
+    string_view v = AsStringView<T>::view(std::forward<T>(s));
+    return view_.find(v, pos);
+  }
+
+  size_type find(const char* s, size_type pos, size_type count) const
+  {
+    return view_.find(s, pos, count);
+  }
+
+  template <typename T>
+  typename std::enable_if<AsStringView<T>::value, size_type>::type rfind(
+    T&& s, size_type pos = npos) const
+  {
+    string_view v = AsStringView<T>::view(std::forward<T>(s));
+    return view_.rfind(v, pos);
+  }
+
+  size_type rfind(const char* s, size_type pos, size_type count) const
+  {
+    return view_.rfind(s, pos, count);
+  }
+
+  template <typename T>
+  typename std::enable_if<AsStringView<T>::value, size_type>::type
+  find_first_of(T&& s, size_type pos = 0) const
+  {
+    string_view v = AsStringView<T>::view(std::forward<T>(s));
+    return view_.find_first_of(v, pos);
+  }
+
+  size_type find_first_of(const char* s, size_type pos, size_type count) const
+  {
+    return view_.find_first_of(s, pos, count);
+  }
+
+  template <typename T>
+  typename std::enable_if<AsStringView<T>::value, size_type>::type
+  find_first_not_of(T&& s, size_type pos = 0) const
+  {
+    string_view v = AsStringView<T>::view(std::forward<T>(s));
+    return view_.find_first_not_of(v, pos);
+  }
+
+  size_type find_first_not_of(const char* s, size_type pos,
+                              size_type count) const
+  {
+    return view_.find_first_not_of(s, pos, count);
+  }
+
+  template <typename T>
+  typename std::enable_if<AsStringView<T>::value, size_type>::type
+  find_last_of(T&& s, size_type pos = npos) const
+  {
+    string_view v = AsStringView<T>::view(std::forward<T>(s));
+    return view_.find_last_of(v, pos);
+  }
+
+  size_type find_last_of(const char* s, size_type pos, size_type count) const
+  {
+    return view_.find_last_of(s, pos, count);
+  }
+
+  template <typename T>
+  typename std::enable_if<AsStringView<T>::value, size_type>::type
+  find_last_not_of(T&& s, size_type pos = npos) const
+  {
+    string_view v = AsStringView<T>::view(std::forward<T>(s));
+    return view_.find_last_not_of(v, pos);
+  }
+
+  size_type find_last_not_of(const char* s, size_type pos,
+                             size_type count) const
+  {
+    return view_.find_last_not_of(s, pos, count);
+  }
+
+private:
+  // Internal constructor to move from existing String.
+  String(String&& s, Private) noexcept
+    : String(std::move(s))
+  {
+  }
+
+  // Internal constructor for dynamically allocated string.
+  String(std::string&& s, Private);
+
+  // Internal constructor for view of statically allocated string.
+  String(string_view v, Private)
+    : string_()
+    , view_(v)
+  {
+  }
+
+  void internally_mutate_to_stable_string();
+
+  std::shared_ptr<std::string const> string_;
+  string_view view_;
+};
+
+template <typename L, typename R>
+typename std::enable_if<AsStringView<L>::value && AsStringView<R>::value,
+                        bool>::type
+operator==(L&& l, R&& r)
+{
+  return (AsStringView<L>::view(std::forward<L>(l)) ==
+          AsStringView<R>::view(std::forward<R>(r)));
+}
+
+template <typename L, typename R>
+typename std::enable_if<AsStringView<L>::value && AsStringView<R>::value,
+                        bool>::type
+operator!=(L&& l, R&& r)
+{
+  return (AsStringView<L>::view(std::forward<L>(l)) !=
+          AsStringView<R>::view(std::forward<R>(r)));
+}
+
+template <typename L, typename R>
+typename std::enable_if<AsStringView<L>::value && AsStringView<R>::value,
+                        bool>::type
+operator<(L&& l, R&& r)
+{
+  return (AsStringView<L>::view(std::forward<L>(l)) <
+          AsStringView<R>::view(std::forward<R>(r)));
+}
+
+template <typename L, typename R>
+typename std::enable_if<AsStringView<L>::value && AsStringView<R>::value,
+                        bool>::type
+operator<=(L&& l, R&& r)
+{
+  return (AsStringView<L>::view(std::forward<L>(l)) <=
+          AsStringView<R>::view(std::forward<R>(r)));
+}
+
+template <typename L, typename R>
+typename std::enable_if<AsStringView<L>::value && AsStringView<R>::value,
+                        bool>::type
+operator>(L&& l, R&& r)
+{
+  return (AsStringView<L>::view(std::forward<L>(l)) >
+          AsStringView<R>::view(std::forward<R>(r)));
+}
+
+template <typename L, typename R>
+typename std::enable_if<AsStringView<L>::value && AsStringView<R>::value,
+                        bool>::type
+operator>=(L&& l, R&& r)
+{
+  return (AsStringView<L>::view(std::forward<L>(l)) >=
+          AsStringView<R>::view(std::forward<R>(r)));
+}
+
+std::ostream& operator<<(std::ostream& os, String const& s);
+std::string& operator+=(std::string& self, String const& s);
+
+template <typename L, typename R>
+struct StringOpPlus
+{
+  L l;
+  R r;
+#if defined(__SUNPRO_CC)
+  StringOpPlus(L in_l, R in_r)
+    : l(in_l)
+    , r(in_r)
+  {
+  }
+#endif
+  operator std::string() const;
+  std::string::size_type size() const { return l.size() + r.size(); }
+};
+
+template <typename T>
+struct StringAdd
+{
+  static const bool value = AsStringView<T>::value;
+  typedef string_view temp_type;
+  template <typename S>
+  static temp_type temp(S&& s)
+  {
+    return AsStringView<T>::view(std::forward<S>(s));
+  }
+};
+
+template <typename L, typename R>
+struct StringAdd<StringOpPlus<L, R>> : std::true_type
+{
+  typedef StringOpPlus<L, R> const& temp_type;
+  static temp_type temp(temp_type s) { return s; }
+};
+
+template <typename L, typename R>
+StringOpPlus<L, R>::operator std::string() const
+{
+  std::string s;
+  s.reserve(size());
+  s += *this;
+  return s;
+}
+
+template <typename L, typename R>
+std::string& operator+=(std::string& s, StringOpPlus<L, R> const& a)
+{
+  s.reserve(s.size() + a.size());
+  s += a.l;
+  s += a.r;
+  return s;
+}
+
+template <typename L, typename R>
+String& operator+=(String& s, StringOpPlus<L, R> const& a)
+{
+  std::string r;
+  r.reserve(s.size() + a.size());
+  r.assign(s.data(), s.size());
+  r += a.l;
+  r += a.r;
+  s = std::move(r);
+  return s;
+}
+
+template <typename L, typename R>
+std::ostream& operator<<(std::ostream& os, StringOpPlus<L, R> const& a)
+{
+  return os << a.l << a.r;
+}
+
+template <typename L, typename R>
+struct IntoString<StringOpPlus<L, R>> : std::true_type
+{
+  static std::string into_string(StringOpPlus<L, R> const& a) { return a; }
+};
+
+template <typename L, typename R>
+typename std::enable_if<StringAdd<L>::value && StringAdd<R>::value,
+                        StringOpPlus<typename StringAdd<L>::temp_type,
+                                     typename StringAdd<R>::temp_type>>::type
+operator+(L&& l, R&& r)
+{
+  return { StringAdd<L>::temp(std::forward<L>(l)),
+           StringAdd<R>::temp(std::forward<R>(r)) };
+}
+
+template <typename LL, typename LR, typename R>
+typename std::enable_if<AsStringView<R>::value, bool>::type operator==(
+  StringOpPlus<LL, LR> const& l, R&& r)
+{
+  return std::string(l) == AsStringView<R>::view(std::forward<R>(r));
+}
+
+template <typename L, typename RL, typename RR>
+typename std::enable_if<AsStringView<L>::value, bool>::type operator==(
+  L&& l, StringOpPlus<RL, RR> const& r)
+{
+  return AsStringView<L>::view(std::forward<L>(l)) == std::string(r);
+}
+
+} // namespace cm
+
+namespace std {
+
+template <>
+struct hash<cm::String>
+{
+  typedef cm::String argument_type;
+  typedef size_t result_type;
+
+  result_type operator()(argument_type const& s) const noexcept
+  {
+    result_type const h(std::hash<cm::string_view>{}(s.view()));
+    return h;
+  }
+};
+}
+
+#endif
diff --git a/Source/cmTimestamp.h b/Source/cmTimestamp.h
index 8dd499a..2f75acb 100644
--- a/Source/cmTimestamp.h
+++ b/Source/cmTimestamp.h
@@ -23,12 +23,12 @@
                                    const std::string& formatString,
                                    bool utcFlag);
 
-private:
-  time_t CreateUtcTimeTFromTm(struct tm& timeStruct) const;
-
   std::string CreateTimestampFromTimeT(time_t timeT, std::string formatString,
                                        bool utcFlag) const;
 
+private:
+  time_t CreateUtcTimeTFromTm(struct tm& timeStruct) const;
+
   std::string AddTimestampComponent(char flag, struct tm& timeStruct,
                                     time_t timeT) const;
 };
diff --git a/Source/cm_static_string_view.hxx b/Source/cm_static_string_view.hxx
new file mode 100644
index 0000000..1bef0c6
--- /dev/null
+++ b/Source/cm_static_string_view.hxx
@@ -0,0 +1,41 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cm_static_string_view_hxx
+#define cm_static_string_view_hxx
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include "cm_string_view.hxx"
+
+#include <cstddef>
+
+namespace cm {
+
+/** A string_view that only binds to static storage.
+ *
+ * This is used together with the `""_s` user-defined literal operator
+ * to construct a type-safe abstraction of a string_view that only views
+ * statically allocated strings.  These strings are const and available
+ * for the entire lifetime of the program.
+ */
+class static_string_view : public string_view
+{
+  static_string_view(string_view v)
+    : string_view(v)
+  {
+  }
+
+  friend static_string_view operator"" _s(const char* data, size_t size);
+};
+
+/** Create a static_string_view using `""_s` literal syntax.  */
+inline static_string_view operator"" _s(const char* data, size_t size)
+{
+  return string_view(data, size);
+}
+
+} // namespace cm
+
+using cm::operator"" _s;
+
+#endif
diff --git a/Source/cm_string_view.cxx b/Source/cm_string_view.cxx
new file mode 100644
index 0000000..61fa80e
--- /dev/null
+++ b/Source/cm_string_view.cxx
@@ -0,0 +1,301 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+
+#include "cm_string_view.hxx"
+
+#ifndef CMake_HAVE_CXX_STRING_VIEW
+
+#  include "cm_kwiml.h"
+
+#  include <algorithm>
+#  include <ostream>
+#  include <stdexcept>
+
+namespace cm {
+
+string_view::const_reference string_view::at(size_type pos) const
+{
+  if (pos >= size_) {
+    throw std::out_of_range("Index out of range in string_view::at");
+  }
+  return data_[pos];
+}
+
+string_view::size_type string_view::copy(char* dest, size_type count,
+                                         size_type pos) const
+{
+  if (pos > size_) {
+    throw std::out_of_range("Index out of range in string_view::copy");
+  }
+  size_type const rcount = std::min(count, size_ - pos);
+  traits_type::copy(dest, data_ + pos, rcount);
+  return rcount;
+}
+
+string_view string_view::substr(size_type pos, size_type count) const
+{
+  if (pos > size_) {
+    throw std::out_of_range("Index out of range in string_view::substr");
+  }
+  size_type const rcount = std::min(count, size_ - pos);
+  return string_view(data_ + pos, rcount);
+}
+
+int string_view::compare(string_view v) const noexcept
+{
+  size_type const rlen = std::min(size_, v.size_);
+  int c = traits_type::compare(data_, v.data_, rlen);
+  if (c == 0) {
+    if (size_ < v.size_) {
+      c = -1;
+    } else if (size_ > v.size_) {
+      c = 1;
+    }
+  }
+  return c;
+}
+
+int string_view::compare(size_type pos1, size_type count1, string_view v) const
+{
+  return substr(pos1, count1).compare(v);
+}
+
+int string_view::compare(size_type pos1, size_type count1, string_view v,
+                         size_type pos2, size_type count2) const
+{
+  return substr(pos1, count1).compare(v.substr(pos2, count2));
+}
+
+int string_view::compare(const char* s) const
+{
+  return compare(string_view(s));
+}
+
+int string_view::compare(size_type pos1, size_type count1, const char* s) const
+{
+  return substr(pos1, count1).compare(string_view(s));
+}
+
+int string_view::compare(size_type pos1, size_type count1, const char* s,
+                         size_type count2) const
+{
+  return substr(pos1, count1).compare(string_view(s, count2));
+}
+
+string_view::size_type string_view::find(string_view v, size_type pos) const
+  noexcept
+{
+  for (; pos + v.size_ <= size_; ++pos) {
+    if (std::char_traits<char>::compare(data_ + pos, v.data_, v.size_) == 0) {
+      return pos;
+    }
+  }
+  return npos;
+}
+
+string_view::size_type string_view::find(char c, size_type pos) const noexcept
+{
+  return find(string_view(&c, 1), pos);
+}
+
+string_view::size_type string_view::find(const char* s, size_type pos,
+                                         size_type count) const
+{
+  return find(string_view(s, count), pos);
+}
+
+string_view::size_type string_view::find(const char* s, size_type pos) const
+{
+  return find(string_view(s), pos);
+}
+
+string_view::size_type string_view::rfind(string_view v, size_type pos) const
+  noexcept
+{
+  if (size_ >= v.size_) {
+    for (pos = std::min(pos, size_ - v.size_) + 1; pos > 0;) {
+      --pos;
+      if (std::char_traits<char>::compare(data_ + pos, v.data_, v.size_) ==
+          0) {
+        return pos;
+      }
+    }
+  }
+  return npos;
+}
+
+string_view::size_type string_view::rfind(char c, size_type pos) const noexcept
+{
+  return rfind(string_view(&c, 1), pos);
+}
+
+string_view::size_type string_view::rfind(const char* s, size_type pos,
+                                          size_type count) const
+{
+  return rfind(string_view(s, count), pos);
+}
+
+string_view::size_type string_view::rfind(const char* s, size_type pos) const
+{
+  return rfind(string_view(s), pos);
+}
+
+string_view::size_type string_view::find_first_of(string_view v,
+                                                  size_type pos) const noexcept
+{
+  for (; pos < size_; ++pos) {
+    if (traits_type::find(v.data_, v.size_, data_[pos])) {
+      return pos;
+    }
+  }
+  return npos;
+}
+
+string_view::size_type string_view::find_first_of(char c, size_type pos) const
+  noexcept
+{
+  return find_first_of(string_view(&c, 1), pos);
+}
+
+string_view::size_type string_view::find_first_of(const char* s, size_type pos,
+                                                  size_type count) const
+{
+  return find_first_of(string_view(s, count), pos);
+}
+
+string_view::size_type string_view::find_first_of(const char* s,
+                                                  size_type pos) const
+{
+  return find_first_of(string_view(s), pos);
+}
+
+string_view::size_type string_view::find_last_of(string_view v,
+                                                 size_type pos) const noexcept
+{
+  if (size_ > 0) {
+    for (pos = std::min(pos, size_ - 1) + 1; pos > 0;) {
+      --pos;
+      if (traits_type::find(v.data_, v.size_, data_[pos])) {
+        return pos;
+      }
+    }
+  }
+  return npos;
+}
+
+string_view::size_type string_view::find_last_of(char c, size_type pos) const
+  noexcept
+{
+  return find_last_of(string_view(&c, 1), pos);
+}
+
+string_view::size_type string_view::find_last_of(const char* s, size_type pos,
+                                                 size_type count) const
+{
+  return find_last_of(string_view(s, count), pos);
+}
+
+string_view::size_type string_view::find_last_of(const char* s,
+                                                 size_type pos) const
+{
+  return find_last_of(string_view(s), pos);
+}
+
+string_view::size_type string_view::find_first_not_of(string_view v,
+                                                      size_type pos) const
+  noexcept
+{
+  for (; pos < size_; ++pos) {
+    if (!traits_type::find(v.data_, v.size_, data_[pos])) {
+      return pos;
+    }
+  }
+  return npos;
+}
+
+string_view::size_type string_view::find_first_not_of(char c,
+                                                      size_type pos) const
+  noexcept
+{
+  return find_first_not_of(string_view(&c, 1), pos);
+}
+
+string_view::size_type string_view::find_first_not_of(const char* s,
+                                                      size_type pos,
+                                                      size_type count) const
+{
+  return find_first_not_of(string_view(s, count), pos);
+}
+
+string_view::size_type string_view::find_first_not_of(const char* s,
+                                                      size_type pos) const
+{
+  return find_first_not_of(string_view(s), pos);
+}
+
+string_view::size_type string_view::find_last_not_of(string_view v,
+                                                     size_type pos) const
+  noexcept
+{
+  if (size_ > 0) {
+    for (pos = std::min(pos, size_ - 1) + 1; pos > 0;) {
+      --pos;
+      if (!traits_type::find(v.data_, v.size_, data_[pos])) {
+        return pos;
+      }
+    }
+  }
+  return npos;
+}
+
+string_view::size_type string_view::find_last_not_of(char c,
+                                                     size_type pos) const
+  noexcept
+{
+  return find_last_not_of(string_view(&c, 1), pos);
+}
+
+string_view::size_type string_view::find_last_not_of(const char* s,
+                                                     size_type pos,
+                                                     size_type count) const
+{
+  return find_last_not_of(string_view(s, count), pos);
+}
+
+string_view::size_type string_view::find_last_not_of(const char* s,
+                                                     size_type pos) const
+{
+  return find_last_not_of(string_view(s), pos);
+}
+
+std::ostream& operator<<(std::ostream& o, string_view v)
+{
+  return o.write(v.data(), v.size());
+}
+
+std::string& operator+=(std::string& s, string_view v)
+{
+  s.append(v.data(), v.size());
+  return s;
+}
+}
+
+std::hash<cm::string_view>::result_type std::hash<cm::string_view>::operator()(
+  argument_type const& s) const noexcept
+{
+  // FNV-1a hash.
+  static KWIML_INT_uint64_t const fnv_offset_basis = 0xcbf29ce484222325;
+  static KWIML_INT_uint64_t const fnv_prime = 0x100000001b3;
+  KWIML_INT_uint64_t h = fnv_offset_basis;
+  for (char const& c : s) {
+    h = h ^ KWIML_INT_uint64_t(KWIML_INT_uint8_t(c));
+    h = h * fnv_prime;
+  }
+  return result_type(h);
+}
+#else
+// Avoid empty translation unit.
+void cm_string_view_cxx()
+{
+}
+#endif
diff --git a/Source/cm_string_view.hxx b/Source/cm_string_view.hxx
new file mode 100644
index 0000000..d368ed8
--- /dev/null
+++ b/Source/cm_string_view.hxx
@@ -0,0 +1,217 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cm_string_view_hxx
+#define cm_string_view_hxx
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#if __cplusplus >= 201703L || defined(_MSVC_LANG) && _MSVC_LANG >= 201703L
+#  define CMake_HAVE_CXX_STRING_VIEW
+#endif
+
+#ifdef CMake_HAVE_CXX_STRING_VIEW
+#  include <string_view>
+namespace cm {
+using std::string_view;
+}
+#else
+#  include <cstddef>
+#  include <functional>
+#  include <iosfwd>
+#  include <iterator>
+#  include <string>
+
+namespace cm {
+
+class string_view
+{
+public:
+  using traits_type = std::string::traits_type;
+  using value_type = char;
+  using pointer = char*;
+  using const_pointer = const char*;
+  using reference = char&;
+  using const_reference = char const&;
+  using const_iterator = const char*;
+  using iterator = const_iterator;
+  using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+  using reverse_iterator = const_reverse_iterator;
+  using size_type = std::string::size_type;
+  using difference_type = std::string::difference_type;
+
+  static size_type const npos = static_cast<size_type>(-1);
+
+  string_view() noexcept = default;
+  string_view(string_view const&) noexcept = default;
+
+  string_view(const char* s, size_t count) noexcept
+    : data_(s)
+    , size_(count)
+  {
+  }
+
+  string_view(const char* s) noexcept
+    : data_(s)
+    , size_(traits_type::length(s))
+  {
+  }
+
+  // C++17 does not define this constructor.  Instead it defines
+  // a conversion operator on std::string to create a string_view.
+  // Since this implementation is used in C++11, std::string does
+  // not have that conversion.
+  string_view(std::string const& s) noexcept
+    : data_(s.data())
+    , size_(s.size())
+  {
+  }
+
+  // C++17 does not define this conversion.  Instead it defines
+  // a constructor on std::string that can take a string_view.
+  // Since this implementation is used in C++11, std::string does
+  // not have that constructor.
+  explicit operator std::string() const { return std::string(data_, size_); }
+
+  string_view& operator=(string_view const&) = default;
+
+  const_iterator begin() const noexcept { return data_; }
+  const_iterator end() const noexcept { return data_ + size_; }
+  const_iterator cbegin() const noexcept { return begin(); }
+  const_iterator cend() const noexcept { return end(); }
+
+  const_reverse_iterator rbegin() const noexcept
+  {
+    return const_reverse_iterator(end());
+  }
+  const_reverse_iterator rend() const noexcept
+  {
+    return const_reverse_iterator(begin());
+  }
+  const_reverse_iterator crbegin() const noexcept { return rbegin(); }
+  const_reverse_iterator crend() const noexcept { return rend(); }
+
+  const_reference operator[](size_type pos) const noexcept
+  {
+    return data_[pos];
+  }
+  const_reference at(size_type pos) const;
+  const_reference front() const noexcept { return data_[0]; }
+  const_reference back() const noexcept { return data_[size_ - 1]; }
+  const_pointer data() const noexcept { return data_; }
+
+  size_type size() const noexcept { return size_; }
+  size_type length() const noexcept { return size_; }
+  size_type max_size() const noexcept { return npos - 1; }
+  bool empty() const noexcept { return size_ == 0; }
+
+  void remove_prefix(size_type n) noexcept
+  {
+    data_ += n;
+    size_ -= n;
+  }
+  void remove_suffix(size_type n) noexcept { size_ -= n; }
+  void swap(string_view& v) noexcept
+  {
+    string_view tmp = v;
+    v = *this;
+    *this = tmp;
+  }
+
+  size_type copy(char* dest, size_type count, size_type pos = 0) const;
+  string_view substr(size_type pos = 0, size_type count = npos) const;
+
+  int compare(string_view v) const noexcept;
+  int compare(size_type pos1, size_type count1, string_view v) const;
+  int compare(size_type pos1, size_type count1, string_view v, size_type pos2,
+              size_type count2) const;
+  int compare(const char* s) const;
+  int compare(size_type pos1, size_type count1, const char* s) const;
+  int compare(size_type pos1, size_type count1, const char* s,
+              size_type count2) const;
+
+  size_type find(string_view v, size_type pos = 0) const noexcept;
+  size_type find(char c, size_type pos = 0) const noexcept;
+  size_type find(const char* s, size_type pos, size_type count) const;
+  size_type find(const char* s, size_type pos = 0) const;
+
+  size_type rfind(string_view v, size_type pos = npos) const noexcept;
+  size_type rfind(char c, size_type pos = npos) const noexcept;
+  size_type rfind(const char* s, size_type pos, size_type count) const;
+  size_type rfind(const char* s, size_type pos = npos) const;
+
+  size_type find_first_of(string_view v, size_type pos = 0) const noexcept;
+  size_type find_first_of(char c, size_type pos = 0) const noexcept;
+  size_type find_first_of(const char* s, size_type pos, size_type count) const;
+  size_type find_first_of(const char* s, size_type pos = 0) const;
+
+  size_type find_last_of(string_view v, size_type pos = npos) const noexcept;
+  size_type find_last_of(char c, size_type pos = npos) const noexcept;
+  size_type find_last_of(const char* s, size_type pos, size_type count) const;
+  size_type find_last_of(const char* s, size_type pos = npos) const;
+
+  size_type find_first_not_of(string_view v, size_type pos = 0) const noexcept;
+  size_type find_first_not_of(char c, size_type pos = 0) const noexcept;
+  size_type find_first_not_of(const char* s, size_type pos,
+                              size_type count) const;
+  size_type find_first_not_of(const char* s, size_type pos = 0) const;
+
+  size_type find_last_not_of(string_view v, size_type pos = npos) const
+    noexcept;
+  size_type find_last_not_of(char c, size_type pos = npos) const noexcept;
+  size_type find_last_not_of(const char* s, size_type pos,
+                             size_type count) const;
+  size_type find_last_not_of(const char* s, size_type pos = npos) const;
+
+private:
+  const char* data_ = nullptr;
+  size_type size_ = 0;
+};
+
+std::ostream& operator<<(std::ostream& o, string_view v);
+
+std::string& operator+=(std::string& s, string_view v);
+
+inline bool operator==(string_view l, string_view r) noexcept
+{
+  return l.compare(r) == 0;
+}
+
+inline bool operator!=(string_view l, string_view r) noexcept
+{
+  return l.compare(r) != 0;
+}
+
+inline bool operator<(string_view l, string_view r) noexcept
+{
+  return l.compare(r) < 0;
+}
+
+inline bool operator<=(string_view l, string_view r) noexcept
+{
+  return l.compare(r) <= 0;
+}
+
+inline bool operator>(string_view l, string_view r) noexcept
+{
+  return l.compare(r) > 0;
+}
+
+inline bool operator>=(string_view l, string_view r) noexcept
+{
+  return l.compare(r) >= 0;
+}
+}
+
+namespace std {
+
+template <>
+struct hash<cm::string_view>
+{
+  typedef cm::string_view argument_type;
+  typedef size_t result_type;
+  result_type operator()(argument_type const& s) const noexcept;
+};
+}
+
+#endif
+#endif
diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index 2ac7f4d..e81d14b 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -30,6 +30,7 @@
 #if defined(CMAKE_BUILD_WITH_CMAKE)
 #  include "cm_jsoncpp_writer.h"
 
+#  include "cmFileAPI.h"
 #  include "cmGraphVizWriter.h"
 #  include "cmVariableWatch.h"
 #  include <unordered_map>
@@ -1443,6 +1444,11 @@
     this->TruncateOutputLog("CMakeError.log");
   }
 
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+  this->FileAPI = cm::make_unique<cmFileAPI>(this);
+  this->FileAPI->ReadQueries();
+#endif
+
   // actually do the configure
   this->GlobalGenerator->Configure();
   // Before saving the cache
@@ -1682,6 +1688,10 @@
   // for the Visual Studio and Xcode generators.)
   this->SaveCache(this->GetHomeOutputDirectory());
 
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+  this->FileAPI->WriteReplies();
+#endif
+
   return 0;
 }
 
diff --git a/Source/cmake.h b/Source/cmake.h
index d3d0e80..d00acc7 100644
--- a/Source/cmake.h
+++ b/Source/cmake.h
@@ -6,6 +6,7 @@
 #include "cmConfigure.h" // IWYU pragma: keep
 
 #include <map>
+#include <memory> // IWYU pragma: keep
 #include <set>
 #include <string>
 #include <unordered_set>
@@ -21,6 +22,7 @@
 #endif
 
 class cmExternalMakefileProjectGeneratorFactory;
+class cmFileAPI;
 class cmFileTimeComparison;
 class cmGlobalGenerator;
 class cmGlobalGeneratorFactory;
@@ -528,6 +530,7 @@
 
 #if defined(CMAKE_BUILD_WITH_CMAKE)
   cmVariableWatch* VariableWatch;
+  std::unique_ptr<cmFileAPI> FileAPI;
 #endif
 
   cmState* State;
diff --git a/Source/kwsys/SystemTools.cxx b/Source/kwsys/SystemTools.cxx
index 331f16e..c5160a9 100644
--- a/Source/kwsys/SystemTools.cxx
+++ b/Source/kwsys/SystemTools.cxx
@@ -82,6 +82,10 @@
 #  include <signal.h> /* sigprocmask */
 #endif
 
+#ifdef __linux
+#  include <linux/fs.h>
+#endif
+
 // Windows API.
 #if defined(_WIN32)
 #  include <windows.h>
@@ -2158,6 +2162,120 @@
 }
 
 /**
+ * Blockwise copy source to destination file
+ */
+static bool CopyFileContentBlockwise(const std::string& source,
+                                     const std::string& destination)
+{
+// Open files
+#if defined(_WIN32)
+  kwsys::ifstream fin(
+    Encoding::ToNarrow(Encoding::ToWindowsExtendedPath(source)).c_str(),
+    std::ios::in | std::ios::binary);
+#else
+  kwsys::ifstream fin(source.c_str(), std::ios::in | std::ios::binary);
+#endif
+  if (!fin) {
+    return false;
+  }
+
+  // try and remove the destination file so that read only destination files
+  // can be written to.
+  // If the remove fails continue so that files in read only directories
+  // that do not allow file removal can be modified.
+  SystemTools::RemoveFile(destination);
+
+#if defined(_WIN32)
+  kwsys::ofstream fout(
+    Encoding::ToNarrow(Encoding::ToWindowsExtendedPath(destination)).c_str(),
+    std::ios::out | std::ios::trunc | std::ios::binary);
+#else
+  kwsys::ofstream fout(destination.c_str(),
+                       std::ios::out | std::ios::trunc | std::ios::binary);
+#endif
+  if (!fout) {
+    return false;
+  }
+
+  // This copy loop is very sensitive on certain platforms with
+  // slightly broken stream libraries (like HPUX).  Normally, it is
+  // incorrect to not check the error condition on the fin.read()
+  // before using the data, but the fin.gcount() will be zero if an
+  // error occurred.  Therefore, the loop should be safe everywhere.
+  while (fin) {
+    const int bufferSize = 4096;
+    char buffer[bufferSize];
+
+    fin.read(buffer, bufferSize);
+    if (fin.gcount()) {
+      fout.write(buffer, fin.gcount());
+    } else {
+      break;
+    }
+  }
+
+  // Make sure the operating system has finished writing the file
+  // before closing it.  This will ensure the file is finished before
+  // the check below.
+  fout.flush();
+
+  fin.close();
+  fout.close();
+
+  if (!fout) {
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * Clone the source file to the destination file
+ *
+ * If available, the Linux FICLONE ioctl is used to create a check
+ * copy-on-write clone of the source file.
+ *
+ * The method returns false for the following cases:
+ * - The code has not been compiled on Linux or the ioctl was unknown
+ * - The source and destination is on different file systems
+ * - The underlying filesystem does not support file cloning
+ * - An unspecified error occurred
+ */
+static bool CloneFileContent(const std::string& source,
+                             const std::string& destination)
+{
+#if defined(__linux) && defined(FICLONE)
+  int in = open(source.c_str(), O_RDONLY);
+  if (in < 0) {
+    return false;
+  }
+
+  SystemTools::RemoveFile(destination);
+
+  int out =
+    open(destination.c_str(), O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
+  if (out < 0) {
+    close(in);
+    return false;
+  }
+
+  int result = ioctl(out, FICLONE, in);
+  close(in);
+  close(out);
+
+  if (result < 0) {
+    return false;
+  }
+
+  return true;
+#else
+  (void)source;
+  (void)destination;
+  return false;
+#endif
+}
+
+/**
  * Copy a file named by "source" to the file named by "destination".
  */
 bool SystemTools::CopyFileAlways(const std::string& source,
@@ -2174,9 +2292,6 @@
   if (SystemTools::FileIsDirectory(source)) {
     SystemTools::MakeDirectory(destination);
   } else {
-    const int bufferSize = 4096;
-    char buffer[bufferSize];
-
     // If destination is a directory, try to create a file with the same
     // name as the source in that directory.
 
@@ -2195,62 +2310,12 @@
 
     SystemTools::MakeDirectory(destination_dir);
 
-// Open files
-#if defined(_WIN32)
-    kwsys::ifstream fin(
-      Encoding::ToNarrow(Encoding::ToWindowsExtendedPath(source)).c_str(),
-      std::ios::in | std::ios::binary);
-#else
-    kwsys::ifstream fin(source.c_str(), std::ios::in | std::ios::binary);
-#endif
-    if (!fin) {
-      return false;
-    }
-
-    // try and remove the destination file so that read only destination files
-    // can be written to.
-    // If the remove fails continue so that files in read only directories
-    // that do not allow file removal can be modified.
-    SystemTools::RemoveFile(real_destination);
-
-#if defined(_WIN32)
-    kwsys::ofstream fout(
-      Encoding::ToNarrow(Encoding::ToWindowsExtendedPath(real_destination))
-        .c_str(),
-      std::ios::out | std::ios::trunc | std::ios::binary);
-#else
-    kwsys::ofstream fout(real_destination.c_str(),
-                         std::ios::out | std::ios::trunc | std::ios::binary);
-#endif
-    if (!fout) {
-      return false;
-    }
-
-    // This copy loop is very sensitive on certain platforms with
-    // slightly broken stream libraries (like HPUX).  Normally, it is
-    // incorrect to not check the error condition on the fin.read()
-    // before using the data, but the fin.gcount() will be zero if an
-    // error occurred.  Therefore, the loop should be safe everywhere.
-    while (fin) {
-      fin.read(buffer, bufferSize);
-      if (fin.gcount()) {
-        fout.write(buffer, fin.gcount());
-      } else {
-        break;
+    if (!CloneFileContent(source, real_destination)) {
+      // if cloning did not succeed, fall back to blockwise copy
+      if (!CopyFileContentBlockwise(source, real_destination)) {
+        return false;
       }
     }
-
-    // Make sure the operating system has finished writing the file
-    // before closing it.  This will ensure the file is finished before
-    // the check below.
-    fout.flush();
-
-    fin.close();
-    fout.close();
-
-    if (!fout) {
-      return false;
-    }
   }
   if (perms) {
     if (!SystemTools::SetPermissions(real_destination, perm)) {
diff --git a/Tests/CMakeLib/CMakeLists.txt b/Tests/CMakeLib/CMakeLists.txt
index 126076d..f6a9153 100644
--- a/Tests/CMakeLib/CMakeLists.txt
+++ b/Tests/CMakeLib/CMakeLists.txt
@@ -7,6 +7,7 @@
 set(CMakeLib_TESTS
   testGeneratedFileStream.cxx
   testRST.cxx
+  testString.cxx
   testSystemTools.cxx
   testUTF8.cxx
   testXMLParser.cxx
diff --git a/Tests/CMakeLib/testString.cxx b/Tests/CMakeLib/testString.cxx
new file mode 100644
index 0000000..2aa1459
--- /dev/null
+++ b/Tests/CMakeLib/testString.cxx
@@ -0,0 +1,1347 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+
+#include "cmString.hxx"
+
+#include "cm_static_string_view.hxx"
+#include "cm_string_view.hxx"
+
+#include <cstring>
+#include <iostream>
+#include <iterator>
+#include <sstream>
+#include <stdexcept>
+#include <string>
+#include <type_traits>
+#include <utility>
+
+#define ASSERT_TRUE(x)                                                        \
+  if (!(x)) {                                                                 \
+    std::cout << "ASSERT_TRUE(" #x ") failed on line " << __LINE__ << "\n";   \
+    return false;                                                             \
+  }
+
+static bool testConstructDefault()
+{
+  std::cout << "testConstructDefault()\n";
+  cm::String str;
+  cm::String const& str_const = str;
+  ASSERT_TRUE(bool(str_const) == false);
+  ASSERT_TRUE(str_const.data() == nullptr);
+  ASSERT_TRUE(str_const.size() == 0);
+  ASSERT_TRUE(str_const.empty());
+  ASSERT_TRUE(str_const.is_stable());
+  ASSERT_TRUE(str.c_str() == nullptr);
+  ASSERT_TRUE(str.str().empty());
+  ASSERT_TRUE(str.is_stable());
+  return true;
+}
+
+static bool testFromNullPtr(cm::String str)
+{
+  cm::String const& str_const = str;
+  ASSERT_TRUE(bool(str_const) == false);
+  ASSERT_TRUE(str_const.data() == nullptr);
+  ASSERT_TRUE(str_const.size() == 0);
+  ASSERT_TRUE(str_const.empty());
+  ASSERT_TRUE(str_const.is_stable());
+  ASSERT_TRUE(str.c_str() == nullptr);
+  ASSERT_TRUE(str.str().empty());
+  ASSERT_TRUE(str.is_stable());
+  return true;
+}
+
+static bool testConstructFromNullPtr()
+{
+  std::cout << "testConstructFromNullPtr()\n";
+  return testFromNullPtr(nullptr);
+}
+
+static bool testAssignFromNullPtr()
+{
+  std::cout << "testAssignFromNullPtr()\n";
+  cm::String str;
+  str = nullptr;
+  return testFromNullPtr(str);
+}
+
+static bool testFromCStrNull(cm::String str)
+{
+  cm::String const& str_const = str;
+  ASSERT_TRUE(bool(str_const) == false);
+  ASSERT_TRUE(str_const.data() == nullptr);
+  ASSERT_TRUE(str_const.size() == 0);
+  ASSERT_TRUE(str_const.empty());
+  ASSERT_TRUE(str_const.is_stable());
+  ASSERT_TRUE(str.c_str() == nullptr);
+  ASSERT_TRUE(str.str().empty());
+  ASSERT_TRUE(str.is_stable());
+  return true;
+}
+
+static bool testConstructFromCStrNull()
+{
+  std::cout << "testConstructFromCStrNull()\n";
+  const char* null = nullptr;
+  return testFromCStrNull(null);
+}
+
+static bool testAssignFromCStrNull()
+{
+  std::cout << "testAssignFromCStrNull()\n";
+  const char* null = nullptr;
+  cm::String str;
+  str = null;
+  return testFromCStrNull(str);
+}
+
+static char const charArray[] = "abc";
+
+static bool testFromCharArray(cm::String str)
+{
+  cm::String const& str_const = str;
+  ASSERT_TRUE(str_const.data() != charArray);
+  ASSERT_TRUE(str_const.size() == sizeof(charArray) - 1);
+  ASSERT_TRUE(str_const.is_stable());
+  ASSERT_TRUE(str.c_str() != charArray);
+  ASSERT_TRUE(str.is_stable());
+  cm::String substr = str.substr(1);
+  cm::String const& substr_const = substr;
+  ASSERT_TRUE(substr_const.data() != &charArray[1]);
+  ASSERT_TRUE(substr_const.size() == 2);
+  ASSERT_TRUE(!substr_const.is_stable());
+  ASSERT_TRUE(substr.c_str() != &charArray[1]);
+  ASSERT_TRUE(!substr.is_stable());
+  return true;
+}
+
+static bool testConstructFromCharArray()
+{
+  std::cout << "testConstructFromCharArray()\n";
+  return testFromCharArray(charArray);
+}
+
+static bool testAssignFromCharArray()
+{
+  std::cout << "testAssignFromCharArray()\n";
+  cm::String str;
+  str = charArray;
+  return testFromCharArray(str);
+}
+
+static const char* cstr = "abc";
+
+static bool testFromCStr(cm::String const& str)
+{
+  ASSERT_TRUE(str.data() != cstr);
+  ASSERT_TRUE(str.size() == 3);
+  ASSERT_TRUE(std::strncmp(str.data(), cstr, 3) == 0);
+  ASSERT_TRUE(str.is_stable());
+  return true;
+}
+
+static bool testConstructFromCStr()
+{
+  std::cout << "testConstructFromCStr()\n";
+  return testFromCStr(cstr);
+  ;
+}
+
+static bool testAssignFromCStr()
+{
+  std::cout << "testAssignFromCStr()\n";
+  cm::String str;
+  str = cstr;
+  return testFromCStr(str);
+  ;
+}
+
+static const std::string stdstr = "abc";
+
+static bool testFromStdString(cm::String const& str)
+{
+#if defined(_GLIBCXX_USE_CXX11_ABI) && _GLIBCXX_USE_CXX11_ABI
+  // It would be nice to check this everywhere, but several platforms
+  // still use a CoW implementation even in C++11.
+  ASSERT_TRUE(str.data() != stdstr.data());
+#endif
+  ASSERT_TRUE(str.size() == 3);
+  ASSERT_TRUE(std::strncmp(str.data(), stdstr.data(), 3) == 0);
+  ASSERT_TRUE(str.is_stable());
+  return true;
+}
+
+static bool testConstructFromStdString()
+{
+  std::cout << "testConstructFromStdString()\n";
+  return testFromStdString(stdstr);
+}
+
+static bool testAssignFromStdString()
+{
+  std::cout << "testAssignFromStdString()\n";
+  cm::String str;
+  str = stdstr;
+  return testFromStdString(str);
+}
+
+static bool testConstructFromView()
+{
+  std::cout << "testConstructFromView()\n";
+  cm::string_view view = cstr;
+  return testFromCStr(view);
+}
+
+static bool testAssignFromView()
+{
+  std::cout << "testAssignFromView()\n";
+  cm::string_view view = cstr;
+  cm::String str;
+  str = view;
+  return testFromCStr(str);
+}
+
+static bool testFromChar(cm::String const& str)
+{
+  ASSERT_TRUE(str.size() == 1);
+  ASSERT_TRUE(std::strncmp(str.data(), "a", 1) == 0);
+  ASSERT_TRUE(str.is_stable());
+  return true;
+}
+
+static bool testConstructFromChar()
+{
+  std::cout << "testConstructFromChar()\n";
+  return testFromChar('a');
+}
+
+static bool testAssignFromChar()
+{
+  std::cout << "testAssignFromChar()\n";
+  cm::String str;
+  str = 'a';
+  return testFromChar(str);
+}
+
+static bool testConstructFromInitList()
+{
+  std::cout << "testConstructFromInitList()\n";
+  cm::String const str{ 'a', 'b', 'c' };
+  ASSERT_TRUE(str.size() == 3);
+  ASSERT_TRUE(std::strncmp(str.data(), "abc", 3) == 0);
+  ASSERT_TRUE(str.is_stable());
+  return true;
+}
+
+static bool testAssignFromInitList()
+{
+  std::cout << "testAssignFromInitList()\n";
+  cm::String str;
+  str = { 'a', 'b', 'c' };
+  ASSERT_TRUE(str.size() == 3);
+  ASSERT_TRUE(std::strncmp(str.data(), "abc", 3) == 0);
+  ASSERT_TRUE(str.is_stable());
+  return true;
+}
+
+static bool testConstructFromBuffer()
+{
+  std::cout << "testConstructFromBuffer()\n";
+  cm::String const str(cstr, 3);
+  return testFromCStr(str);
+}
+
+static bool testConstructFromInputIterator()
+{
+  std::cout << "testConstructFromInputIterator()\n";
+  cm::String const str(cstr, cstr + 3);
+  ASSERT_TRUE(str.data() != cstr);
+  ASSERT_TRUE(str.size() == 3);
+  ASSERT_TRUE(std::strncmp(str.data(), cstr, 3) == 0);
+  ASSERT_TRUE(str.is_stable());
+  return true;
+}
+
+static bool testConstructFromN()
+{
+  std::cout << "testConstructFromN()\n";
+  cm::String const str(3, 'a');
+  ASSERT_TRUE(str.size() == 3);
+  ASSERT_TRUE(std::strncmp(str.data(), "aaa", 3) == 0);
+  ASSERT_TRUE(str.is_stable());
+  return true;
+}
+
+static const auto staticStringView = "abc"_s;
+
+static bool testFromStaticStringView(cm::String str)
+{
+  cm::String const& str_const = str;
+  ASSERT_TRUE(str_const.data() == staticStringView.data());
+  ASSERT_TRUE(str_const.size() == staticStringView.size());
+  ASSERT_TRUE(!str_const.is_stable());
+  ASSERT_TRUE(str.c_str() == staticStringView);
+  ASSERT_TRUE(!str.is_stable());
+  cm::String substr = str.substr(1);
+  cm::String const& substr_const = substr;
+  ASSERT_TRUE(substr_const.data() == &staticStringView[1]);
+  ASSERT_TRUE(substr_const.size() == 2);
+  ASSERT_TRUE(!substr_const.is_stable());
+  ASSERT_TRUE(substr.c_str() == &staticStringView[1]);
+  ASSERT_TRUE(!substr.is_stable());
+  return true;
+}
+
+static bool testConstructFromStaticStringView()
+{
+  std::cout << "testConstructFromStaticStringView()\n";
+  return testFromStaticStringView(staticStringView);
+}
+
+static bool testAssignFromStaticStringView()
+{
+  std::cout << "testAssignFromStaticStringView()\n";
+  cm::String str;
+  str = staticStringView;
+  return testFromStaticStringView(str);
+}
+
+static bool testConstructCopy()
+{
+  std::cout << "testConstructCopy()\n";
+  cm::String s1 = std::string("abc");
+  cm::String s2 = s1;
+  ASSERT_TRUE(s1.data() == s2.data());
+  ASSERT_TRUE(s1.size() == 3);
+  ASSERT_TRUE(s2.size() == 3);
+  ASSERT_TRUE(std::strncmp(s2.data(), "abc", 3) == 0);
+  ASSERT_TRUE(s1.is_stable());
+  ASSERT_TRUE(s2.is_stable());
+  return true;
+}
+
+static bool testConstructMove()
+{
+  std::cout << "testConstructMove()\n";
+  cm::String s1 = std::string("abc");
+  cm::String s2 = std::move(s1);
+  ASSERT_TRUE(s1.data() == nullptr);
+  ASSERT_TRUE(s1.size() == 0);
+  ASSERT_TRUE(s2.size() == 3);
+  ASSERT_TRUE(std::strncmp(s2.data(), "abc", 3) == 0);
+  ASSERT_TRUE(s1.is_stable());
+  ASSERT_TRUE(s2.is_stable());
+  return true;
+}
+
+static bool testAssignCopy()
+{
+  std::cout << "testAssignCopy()\n";
+  cm::String s1 = std::string("abc");
+  cm::String s2;
+  s2 = s1;
+  ASSERT_TRUE(s1.data() == s2.data());
+  ASSERT_TRUE(s1.size() == 3);
+  ASSERT_TRUE(s2.size() == 3);
+  ASSERT_TRUE(std::strncmp(s2.data(), "abc", 3) == 0);
+  ASSERT_TRUE(s1.is_stable());
+  ASSERT_TRUE(s2.is_stable());
+  return true;
+}
+
+static bool testAssignMove()
+{
+  std::cout << "testAssignMove()\n";
+  cm::String s1 = std::string("abc");
+  cm::String s2;
+  s2 = std::move(s1);
+  ASSERT_TRUE(s1.data() == nullptr);
+  ASSERT_TRUE(s1.size() == 0);
+  ASSERT_TRUE(s2.size() == 3);
+  ASSERT_TRUE(std::strncmp(s2.data(), "abc", 3) == 0);
+  ASSERT_TRUE(s1.is_stable());
+  ASSERT_TRUE(s2.is_stable());
+  return true;
+}
+
+static bool testOperatorBool()
+{
+  std::cout << "testOperatorBool()\n";
+  cm::String str;
+  ASSERT_TRUE(!str);
+  str = "";
+  ASSERT_TRUE(str);
+  str = static_cast<const char*>(nullptr);
+  ASSERT_TRUE(!str);
+  str = std::string();
+  ASSERT_TRUE(str);
+  str = nullptr;
+  ASSERT_TRUE(!str);
+  return true;
+}
+
+static bool testOperatorIndex()
+{
+  std::cout << "testOperatorIndex()\n";
+  cm::String str = "abc";
+  ASSERT_TRUE(str[0] == 'a');
+  ASSERT_TRUE(str[1] == 'b');
+  ASSERT_TRUE(str[2] == 'c');
+  return true;
+}
+
+static bool testOperatorPlusEqual()
+{
+  std::cout << "testOperatorPlusEqual()\n";
+  cm::String str = "a";
+  str += "b";
+  {
+    const char* c = "c";
+    str += c;
+  }
+  str += 'd';
+  str += std::string("e");
+  str += cm::string_view("f", 1);
+  str += cm::String("g");
+  ASSERT_TRUE(str.size() == 7);
+  ASSERT_TRUE(std::strncmp(str.data(), "abcdefg", 7) == 0);
+  ASSERT_TRUE(str.is_stable());
+  return true;
+}
+
+static bool testOperatorCompare()
+{
+  std::cout << "testOperatorCompare()\n";
+  cm::String str = "b";
+  {
+    ASSERT_TRUE(str == "b");
+    ASSERT_TRUE("b" == str);
+    ASSERT_TRUE(str != "a");
+    ASSERT_TRUE("a" != str);
+    ASSERT_TRUE(str < "c");
+    ASSERT_TRUE("a" < str);
+    ASSERT_TRUE(str > "a");
+    ASSERT_TRUE("c" > str);
+    ASSERT_TRUE(str <= "b");
+    ASSERT_TRUE("b" <= str);
+    ASSERT_TRUE(str >= "b");
+    ASSERT_TRUE("b" >= str);
+  }
+  {
+    const char* a = "a";
+    const char* b = "b";
+    const char* c = "c";
+    ASSERT_TRUE(str == b);
+    ASSERT_TRUE(b == str);
+    ASSERT_TRUE(str != a);
+    ASSERT_TRUE(a != str);
+    ASSERT_TRUE(str < c);
+    ASSERT_TRUE(a < str);
+    ASSERT_TRUE(str > a);
+    ASSERT_TRUE(c > str);
+    ASSERT_TRUE(str <= b);
+    ASSERT_TRUE(b <= str);
+    ASSERT_TRUE(str >= b);
+    ASSERT_TRUE(b >= str);
+  }
+  {
+    ASSERT_TRUE(str == 'b');
+    ASSERT_TRUE('b' == str);
+    ASSERT_TRUE(str != 'a');
+    ASSERT_TRUE('a' != str);
+    ASSERT_TRUE(str < 'c');
+    ASSERT_TRUE('a' < str);
+    ASSERT_TRUE(str > 'a');
+    ASSERT_TRUE('c' > str);
+    ASSERT_TRUE(str <= 'b');
+    ASSERT_TRUE('b' <= str);
+    ASSERT_TRUE(str >= 'b');
+    ASSERT_TRUE('b' >= str);
+  }
+  {
+    std::string const a = "a";
+    std::string const b = "b";
+    std::string const c = "c";
+    ASSERT_TRUE(str == b);
+    ASSERT_TRUE(b == str);
+    ASSERT_TRUE(str != a);
+    ASSERT_TRUE(a != str);
+    ASSERT_TRUE(str < c);
+    ASSERT_TRUE(a < str);
+    ASSERT_TRUE(str > a);
+    ASSERT_TRUE(c > str);
+    ASSERT_TRUE(str <= b);
+    ASSERT_TRUE(b <= str);
+    ASSERT_TRUE(str >= b);
+    ASSERT_TRUE(b >= str);
+  }
+  {
+    cm::string_view const a("a", 1);
+    cm::string_view const b("b", 1);
+    cm::string_view const c("c", 1);
+    ASSERT_TRUE(str == b);
+    ASSERT_TRUE(b == str);
+    ASSERT_TRUE(str != a);
+    ASSERT_TRUE(a != str);
+    ASSERT_TRUE(str < c);
+    ASSERT_TRUE(a < str);
+    ASSERT_TRUE(str > a);
+    ASSERT_TRUE(c > str);
+    ASSERT_TRUE(str <= b);
+    ASSERT_TRUE(b <= str);
+    ASSERT_TRUE(str >= b);
+    ASSERT_TRUE(b >= str);
+  }
+  {
+    cm::String const a("a");
+    cm::String const b("b");
+    cm::String const c("c");
+    ASSERT_TRUE(str == b);
+    ASSERT_TRUE(b == str);
+    ASSERT_TRUE(str != a);
+    ASSERT_TRUE(a != str);
+    ASSERT_TRUE(str < c);
+    ASSERT_TRUE(a < str);
+    ASSERT_TRUE(str > a);
+    ASSERT_TRUE(c > str);
+    ASSERT_TRUE(str <= b);
+    ASSERT_TRUE(b <= str);
+    ASSERT_TRUE(str >= b);
+    ASSERT_TRUE(b >= str);
+  }
+  return true;
+}
+
+static bool testOperatorStream()
+{
+  std::cout << "testOperatorStream()\n";
+  std::ostringstream ss;
+  ss << "a" << cm::String("b") << 'c';
+  ASSERT_TRUE(ss.str() == "abc");
+  return true;
+}
+
+static bool testOperatorStdStringPlusEqual()
+{
+  std::cout << "testOperatorStdStringPlusEqual()\n";
+  std::string s = "a";
+  s += cm::String("b");
+  ASSERT_TRUE(s == "ab");
+  return true;
+}
+
+static bool testMethod_borrow()
+{
+  std::cout << "testMethod_borrow()\n";
+  std::string s = "abc";
+  cm::String str = cm::String::borrow(s);
+  ASSERT_TRUE(str.data() == s.data());
+  ASSERT_TRUE(str.size() == s.size());
+  ASSERT_TRUE(str == s);
+  return true;
+}
+
+static bool testMethod_view()
+{
+  std::cout << "testMethod_view()\n";
+  cm::String str;
+  ASSERT_TRUE(str.view().data() == nullptr);
+  ASSERT_TRUE(str.view().size() == 0);
+  str = charArray;
+  ASSERT_TRUE(str.view().data() != charArray);
+  ASSERT_TRUE(str.view().size() == sizeof(charArray) - 1);
+  str = std::string("abc");
+  ASSERT_TRUE(str.view().size() == 3);
+  ASSERT_TRUE(strncmp(str.view().data(), "abc", 3) == 0);
+  return true;
+}
+
+static bool testMethod_empty()
+{
+  std::cout << "testMethod_empty()\n";
+  cm::String str;
+  ASSERT_TRUE(str.empty());
+  str = "";
+  ASSERT_TRUE(str.empty());
+  str = "abc";
+  ASSERT_TRUE(!str.empty());
+  str = std::string();
+  ASSERT_TRUE(str.empty());
+  str = std::string("abc");
+  ASSERT_TRUE(!str.empty());
+  return true;
+}
+
+static bool testMethod_length()
+{
+  std::cout << "testMethod_length()\n";
+  cm::String str;
+  ASSERT_TRUE(str.length() == 0);
+  str = "";
+  ASSERT_TRUE(str.length() == 0);
+  str = "abc";
+  ASSERT_TRUE(str.length() == 3);
+  str = std::string();
+  ASSERT_TRUE(str.length() == 0);
+  str = std::string("abc");
+  ASSERT_TRUE(str.length() == 3);
+  return true;
+}
+
+static bool testMethod_at()
+{
+  std::cout << "testMethod_at()\n";
+  cm::String str = "abc";
+  ASSERT_TRUE(str.at(0) == 'a');
+  ASSERT_TRUE(str.at(1) == 'b');
+  ASSERT_TRUE(str.at(2) == 'c');
+  bool except_out_of_range = false;
+  try {
+    str.at(3);
+  } catch (std::out_of_range&) {
+    except_out_of_range = true;
+  }
+  ASSERT_TRUE(except_out_of_range);
+  return true;
+}
+
+static bool testMethod_front_back()
+{
+  std::cout << "testMethod_front_back()\n";
+  cm::String str = "abc";
+  ASSERT_TRUE(str.front() == 'a');
+  ASSERT_TRUE(str.back() == 'c');
+  return true;
+}
+
+static bool testMethodIterators()
+{
+  std::cout << "testMethodIterators()\n";
+  cm::String str = "abc";
+  ASSERT_TRUE(*str.begin() == 'a');
+  ASSERT_TRUE(*(str.end() - 1) == 'c');
+  ASSERT_TRUE(str.end() - str.begin() == 3);
+  ASSERT_TRUE(*str.cbegin() == 'a');
+  ASSERT_TRUE(*(str.cend() - 1) == 'c');
+  ASSERT_TRUE(str.cend() - str.cbegin() == 3);
+  ASSERT_TRUE(*str.rbegin() == 'c');
+  ASSERT_TRUE(*(str.rend() - 1) == 'a');
+  ASSERT_TRUE(str.rend() - str.rbegin() == 3);
+  ASSERT_TRUE(*str.crbegin() == 'c');
+  ASSERT_TRUE(*(str.crend() - 1) == 'a');
+  ASSERT_TRUE(str.crend() - str.crbegin() == 3);
+  return true;
+}
+
+static bool testMethod_clear()
+{
+  std::cout << "testMethod_clear()\n";
+  cm::String str = "abc";
+  ASSERT_TRUE(!str.empty());
+  str.clear();
+  ASSERT_TRUE(str.empty());
+  return true;
+}
+
+static bool testMethod_insert()
+{
+  std::cout << "testMethod_insert()\n";
+  cm::String str = "abc";
+  str.insert(1, 2, 'd').insert(0, 1, '_');
+  ASSERT_TRUE(str.size() == 6);
+  ASSERT_TRUE(std::strncmp(str.data(), "_addbc", 6) == 0);
+  return true;
+}
+
+static bool testMethod_erase()
+{
+  std::cout << "testMethod_erase()\n";
+  cm::String str = "abcdefg";
+  str.erase(5).erase(1, 2);
+  ASSERT_TRUE(str.size() == 3);
+  ASSERT_TRUE(std::strncmp(str.data(), "ade", 3) == 0);
+  return true;
+}
+
+static bool testMethod_push_back()
+{
+  std::cout << "testMethod_push_back()\n";
+  cm::String str = "abc";
+  str.push_back('d');
+  ASSERT_TRUE(str == "abcd");
+  return true;
+}
+
+static bool testMethod_pop_back()
+{
+  std::cout << "testMethod_pop_back()\n";
+  cm::String str = "abc";
+  str.pop_back();
+  ASSERT_TRUE(str == "ab");
+  return true;
+}
+
+static bool testMethod_replace()
+{
+  std::cout << "testMethod_replace()\n";
+  {
+    cm::String str = "abcd";
+    const char* bc = "bc";
+    ASSERT_TRUE(str.replace(1, 2, "BC") == "aBCd");
+    ASSERT_TRUE(str.replace(1, 2, bc) == "abcd");
+    ASSERT_TRUE(str.replace(1, 2, 'x') == "axd");
+    ASSERT_TRUE(str.replace(1, 1, std::string("bc")) == "abcd");
+    ASSERT_TRUE(str.replace(1, 2, cm::string_view("BC", 2)) == "aBCd");
+    ASSERT_TRUE(str.replace(1, 2, cm::String("bc")) == "abcd");
+  }
+  {
+    cm::String str = "abcd";
+    const char* bc = "bc";
+    ASSERT_TRUE(str.replace(str.begin() + 1, str.begin() + 3, "BC") == "aBCd");
+    ASSERT_TRUE(str.replace(str.begin() + 1, str.begin() + 3, bc) == "abcd");
+    ASSERT_TRUE(str.replace(str.begin() + 1, str.begin() + 3, 'x') == "axd");
+    ASSERT_TRUE(str.replace(str.begin() + 1, str.begin() + 2,
+                            std::string("bc")) == "abcd");
+    ASSERT_TRUE(str.replace(str.begin() + 1, str.begin() + 3,
+                            cm::string_view("BC", 2)) == "aBCd");
+    ASSERT_TRUE(str.replace(str.begin() + 1, str.begin() + 3,
+                            cm::String("bc")) == "abcd");
+  }
+  {
+    cm::String str = "abcd";
+    const char* bc = "_bc";
+    ASSERT_TRUE(str.replace(1, 2, "_BC_", 1, 2) == "aBCd");
+    ASSERT_TRUE(str.replace(1, 2, bc, 1) == "abcd");
+    ASSERT_TRUE(str.replace(1, 2, 'x', 0) == "axd");
+    ASSERT_TRUE(str.replace(1, 1, std::string("_bc_"), 1, 2) == "abcd");
+    ASSERT_TRUE(str.replace(1, 2, cm::string_view("_BC", 3), 1) == "aBCd");
+    ASSERT_TRUE(str.replace(1, 2, cm::String("_bc_"), 1, 2) == "abcd");
+  }
+  {
+    cm::String str = "abcd";
+    const char* bc = "_bc_";
+    ASSERT_TRUE(str.replace(1, 2, 2, 'x') == "axxd");
+    ASSERT_TRUE(str.replace(str.begin() + 1, str.begin() + 3, 2, 'y') ==
+                "ayyd");
+    ASSERT_TRUE(
+      str.replace(str.begin() + 1, str.begin() + 3, bc + 1, bc + 3) == "abcd");
+  }
+  return true;
+}
+
+static bool testMethod_copy()
+{
+  std::cout << "testMethod_copy()\n";
+  cm::String str = "abc";
+  char dest[2];
+  cm::String::size_type n = str.copy(dest, 2, 1);
+  ASSERT_TRUE(n == 2);
+  ASSERT_TRUE(std::strncmp(dest, "bc", 2) == 0);
+  n = str.copy(dest, 2);
+  ASSERT_TRUE(n == 2);
+  ASSERT_TRUE(std::strncmp(dest, "ab", 2) == 0);
+  return true;
+}
+
+static bool testMethod_resize()
+{
+  std::cout << "testMethod_resize()\n";
+  cm::String str = "abc";
+  str.resize(3);
+  ASSERT_TRUE(str == "abc");
+  str.resize(2);
+  ASSERT_TRUE(str == "ab");
+  str.resize(3, 'c');
+  ASSERT_TRUE(str == "abc");
+  return true;
+}
+
+static bool testMethod_swap()
+{
+  std::cout << "testMethod_swap()\n";
+  cm::String str1 = std::string("1");
+  cm::String str2 = std::string("2");
+  str1.swap(str2);
+  ASSERT_TRUE(str1 == "2");
+  ASSERT_TRUE(str2 == "1");
+  return true;
+}
+
+static bool testMethod_substr_AtEnd(cm::String str)
+{
+  cm::String substr = str.substr(1);
+  ASSERT_TRUE(substr.data() == str.data() + 1);
+  ASSERT_TRUE(substr.size() == 2);
+  ASSERT_TRUE(!substr.is_stable());
+
+  // c_str() at the end of the buffer does not internally mutate.
+  ASSERT_TRUE(std::strcmp(substr.c_str(), "bc") == 0);
+  ASSERT_TRUE(substr.c_str() == str.data() + 1);
+  ASSERT_TRUE(substr.data() == str.data() + 1);
+  ASSERT_TRUE(substr.size() == 2);
+  ASSERT_TRUE(!substr.is_stable());
+
+  // str() internally mutates.
+  ASSERT_TRUE(substr.str() == "bc");
+  ASSERT_TRUE(substr.is_stable());
+  ASSERT_TRUE(substr.data() != str.data() + 1);
+  ASSERT_TRUE(substr.size() == 2);
+  ASSERT_TRUE(substr.c_str() != str.data() + 1);
+  ASSERT_TRUE(std::strcmp(substr.c_str(), "bc") == 0);
+  return true;
+}
+
+static bool testMethod_substr_AtEndBorrowed()
+{
+  std::cout << "testMethod_substr_AtEndBorrowed()\n";
+  return testMethod_substr_AtEnd("abc"_s);
+}
+
+static bool testMethod_substr_AtEndOwned()
+{
+  std::cout << "testMethod_substr_AtEndOwned()\n";
+  return testMethod_substr_AtEnd(std::string("abc"));
+}
+
+static bool testMethod_substr_AtStart(cm::String str)
+{
+  {
+    cm::String substr = str.substr(0, 2);
+    ASSERT_TRUE(substr.data() == str.data());
+    ASSERT_TRUE(substr.size() == 2);
+
+    // c_str() not at the end of the buffer internally mutates.
+    const char* substr_c = substr.c_str();
+    ASSERT_TRUE(std::strcmp(substr_c, "ab") == 0);
+    ASSERT_TRUE(substr_c != str.data());
+    ASSERT_TRUE(substr.data() != str.data());
+    ASSERT_TRUE(substr.size() == 2);
+    ASSERT_TRUE(substr.is_stable());
+
+    // str() does not need to internally mutate after c_str() did so
+    ASSERT_TRUE(substr.str() == "ab");
+    ASSERT_TRUE(substr.is_stable());
+    ASSERT_TRUE(substr.data() == substr_c);
+    ASSERT_TRUE(substr.size() == 2);
+    ASSERT_TRUE(substr.c_str() == substr_c);
+  }
+
+  {
+    cm::String substr = str.substr(0, 2);
+    ASSERT_TRUE(substr.data() == str.data());
+    ASSERT_TRUE(substr.size() == 2);
+    ASSERT_TRUE(!substr.is_stable());
+
+    // str() internally mutates.
+    ASSERT_TRUE(substr.str() == "ab");
+    ASSERT_TRUE(substr.is_stable());
+    ASSERT_TRUE(substr.data() != str.data());
+    ASSERT_TRUE(substr.size() == 2);
+    ASSERT_TRUE(substr.c_str() != str.data());
+
+    // c_str() does not internally after str() did so
+    const char* substr_c = substr.c_str();
+    ASSERT_TRUE(std::strcmp(substr_c, "ab") == 0);
+    ASSERT_TRUE(substr_c == substr.data());
+    ASSERT_TRUE(substr.size() == 2);
+    ASSERT_TRUE(substr.is_stable());
+  }
+
+  return true;
+}
+
+static bool testMethod_substr_AtStartBorrowed()
+{
+  std::cout << "testMethod_substr_AtStartBorrowed()\n";
+  return testMethod_substr_AtStart("abc"_s);
+}
+
+static bool testMethod_substr_AtStartOwned()
+{
+  std::cout << "testMethod_substr_AtStartOwned()\n";
+  return testMethod_substr_AtStart(std::string("abc"));
+}
+
+static bool testMethod_compare()
+{
+  std::cout << "testMethod_compare()\n";
+  cm::String str = "b";
+  ASSERT_TRUE(str.compare("a") > 0);
+  ASSERT_TRUE(str.compare("b") == 0);
+  ASSERT_TRUE(str.compare("c") < 0);
+  {
+    const char* a = "a";
+    const char* b = "b";
+    const char* c = "c";
+    ASSERT_TRUE(str.compare(a) > 0);
+    ASSERT_TRUE(str.compare(b) == 0);
+    ASSERT_TRUE(str.compare(c) < 0);
+  }
+  ASSERT_TRUE(str.compare('a') > 0);
+  ASSERT_TRUE(str.compare('b') == 0);
+  ASSERT_TRUE(str.compare('c') < 0);
+  ASSERT_TRUE(str.compare(std::string("a")) > 0);
+  ASSERT_TRUE(str.compare(std::string("b")) == 0);
+  ASSERT_TRUE(str.compare(std::string("c")) < 0);
+  ASSERT_TRUE(str.compare(cm::string_view("a_", 1)) > 0);
+  ASSERT_TRUE(str.compare(cm::string_view("b_", 1)) == 0);
+  ASSERT_TRUE(str.compare(cm::string_view("c_", 1)) < 0);
+  ASSERT_TRUE(str.compare(cm::String("a")) > 0);
+  ASSERT_TRUE(str.compare(cm::String("b")) == 0);
+  ASSERT_TRUE(str.compare(cm::String("c")) < 0);
+  ASSERT_TRUE(str.compare(0, 1, cm::string_view("a", 1)) > 0);
+  ASSERT_TRUE(str.compare(1, 0, cm::string_view("", 0)) == 0);
+  ASSERT_TRUE(str.compare(0, 1, cm::string_view("ac", 2), 1, 1) < 0);
+  ASSERT_TRUE(str.compare(1, 0, "") == 0);
+  ASSERT_TRUE(str.compare(1, 0, "_", 0) == 0);
+  return true;
+}
+
+static bool testMethod_find()
+{
+  std::cout << "testMethod_find()\n";
+  cm::String str = "abcabc";
+  ASSERT_TRUE(str.find("a") == 0);
+  ASSERT_TRUE(str.find("a", 1) == 3);
+  {
+    const char* a = "a";
+    ASSERT_TRUE(str.find(a) == 0);
+    ASSERT_TRUE(str.find(a, 1) == 3);
+  }
+  ASSERT_TRUE(str.find('a') == 0);
+  ASSERT_TRUE(str.find('a', 1) == 3);
+  ASSERT_TRUE(str.find(std::string("a")) == 0);
+  ASSERT_TRUE(str.find(std::string("a"), 1) == 3);
+  ASSERT_TRUE(str.find(cm::string_view("a_", 1)) == 0);
+  ASSERT_TRUE(str.find(cm::string_view("a_", 1), 1) == 3);
+  ASSERT_TRUE(str.find(cm::String("a")) == 0);
+  ASSERT_TRUE(str.find(cm::String("a"), 1) == 3);
+  ASSERT_TRUE(str.find("ab_", 1, 2) == 3);
+  return true;
+}
+
+static bool testMethod_rfind()
+{
+  std::cout << "testMethod_rfind()\n";
+  cm::String str = "abcabc";
+  ASSERT_TRUE(str.rfind("a") == 3);
+  ASSERT_TRUE(str.rfind("a", 1) == 0);
+  {
+    const char* a = "a";
+    ASSERT_TRUE(str.rfind(a) == 3);
+    ASSERT_TRUE(str.rfind(a, 1) == 0);
+  }
+  ASSERT_TRUE(str.rfind('a') == 3);
+  ASSERT_TRUE(str.rfind('a', 1) == 0);
+  ASSERT_TRUE(str.rfind(std::string("a")) == 3);
+  ASSERT_TRUE(str.rfind(std::string("a"), 1) == 0);
+  ASSERT_TRUE(str.rfind(cm::string_view("a_", 1)) == 3);
+  ASSERT_TRUE(str.rfind(cm::string_view("a_", 1), 1) == 0);
+  ASSERT_TRUE(str.rfind(cm::String("a")) == 3);
+  ASSERT_TRUE(str.rfind(cm::String("a"), 1) == 0);
+  ASSERT_TRUE(str.rfind("ab_", 1, 2) == 0);
+  return true;
+}
+
+static bool testMethod_find_first_of()
+{
+  std::cout << "testMethod_find_first_of()\n";
+  cm::String str = "abcabc";
+  ASSERT_TRUE(str.find_first_of("_a") == 0);
+  ASSERT_TRUE(str.find_first_of("_a", 1) == 3);
+  {
+    const char* a = "_a";
+    ASSERT_TRUE(str.find_first_of(a) == 0);
+    ASSERT_TRUE(str.find_first_of(a, 1) == 3);
+  }
+  ASSERT_TRUE(str.find_first_of('a') == 0);
+  ASSERT_TRUE(str.find_first_of('a', 1) == 3);
+  ASSERT_TRUE(str.find_first_of(std::string("_a")) == 0);
+  ASSERT_TRUE(str.find_first_of(std::string("_a"), 1) == 3);
+  ASSERT_TRUE(str.find_first_of(cm::string_view("ba_", 1)) == 1);
+  ASSERT_TRUE(str.find_first_of(cm::string_view("ba_", 1), 2) == 4);
+  ASSERT_TRUE(str.find_first_of(cm::String("ab")) == 0);
+  ASSERT_TRUE(str.find_first_of(cm::String("ab"), 2) == 3);
+  ASSERT_TRUE(str.find_first_of("_ab", 1, 2) == 3);
+  return true;
+}
+
+static bool testMethod_find_first_not_of()
+{
+  std::cout << "testMethod_find_first_not_of()\n";
+  cm::String str = "abcabc";
+  ASSERT_TRUE(str.find_first_not_of("_a") == 1);
+  ASSERT_TRUE(str.find_first_not_of("_a", 2) == 2);
+  {
+    const char* a = "_a";
+    ASSERT_TRUE(str.find_first_not_of(a) == 1);
+    ASSERT_TRUE(str.find_first_not_of(a, 2) == 2);
+  }
+  ASSERT_TRUE(str.find_first_not_of('a') == 1);
+  ASSERT_TRUE(str.find_first_not_of('a', 2) == 2);
+  ASSERT_TRUE(str.find_first_not_of(std::string("_a")) == 1);
+  ASSERT_TRUE(str.find_first_not_of(std::string("_a"), 2) == 2);
+  ASSERT_TRUE(str.find_first_not_of(cm::string_view("ba_", 1)) == 0);
+  ASSERT_TRUE(str.find_first_not_of(cm::string_view("ba_", 1), 1) == 2);
+  ASSERT_TRUE(str.find_first_not_of(cm::String("_a")) == 1);
+  ASSERT_TRUE(str.find_first_not_of(cm::String("_a"), 2) == 2);
+  ASSERT_TRUE(str.find_first_not_of("_bca", 1, 3) == 3);
+  return true;
+}
+
+static bool testMethod_find_last_of()
+{
+  std::cout << "testMethod_find_last_of()\n";
+  cm::String str = "abcabc";
+  ASSERT_TRUE(str.find_last_of("_a") == 3);
+  ASSERT_TRUE(str.find_last_of("_a", 1) == 0);
+  {
+    const char* a = "_a";
+    ASSERT_TRUE(str.find_last_of(a) == 3);
+    ASSERT_TRUE(str.find_last_of(a, 1) == 0);
+  }
+  ASSERT_TRUE(str.find_last_of('a') == 3);
+  ASSERT_TRUE(str.find_last_of('a', 1) == 0);
+  ASSERT_TRUE(str.find_last_of(std::string("_a")) == 3);
+  ASSERT_TRUE(str.find_last_of(std::string("_a"), 1) == 0);
+  ASSERT_TRUE(str.find_last_of(cm::string_view("ba_", 1)) == 4);
+  ASSERT_TRUE(str.find_last_of(cm::string_view("ba_", 1), 2) == 1);
+  ASSERT_TRUE(str.find_last_of(cm::String("ab")) == 4);
+  ASSERT_TRUE(str.find_last_of(cm::String("ab"), 2) == 1);
+  ASSERT_TRUE(str.find_last_of("_ab", 1, 2) == 0);
+  return true;
+}
+
+static bool testMethod_find_last_not_of()
+{
+  std::cout << "testMethod_find_last_not_of()\n";
+  cm::String str = "abcabc";
+  ASSERT_TRUE(str.find_last_not_of("_a") == 5);
+  ASSERT_TRUE(str.find_last_not_of("_a", 1) == 1);
+  {
+    const char* a = "_a";
+    ASSERT_TRUE(str.find_last_not_of(a) == 5);
+    ASSERT_TRUE(str.find_last_not_of(a, 1) == 1);
+  }
+  ASSERT_TRUE(str.find_last_not_of('a') == 5);
+  ASSERT_TRUE(str.find_last_not_of('a', 1) == 1);
+  ASSERT_TRUE(str.find_last_not_of(std::string("_a")) == 5);
+  ASSERT_TRUE(str.find_last_not_of(std::string("_a"), 1) == 1);
+  ASSERT_TRUE(str.find_last_not_of(cm::string_view("cb_", 1)) == 4);
+  ASSERT_TRUE(str.find_last_not_of(cm::string_view("cb_", 1), 2) == 1);
+  ASSERT_TRUE(str.find_last_not_of(cm::String("_a")) == 5);
+  ASSERT_TRUE(str.find_last_not_of(cm::String("_a"), 1) == 1);
+  ASSERT_TRUE(str.find_last_not_of("cb_", 2, 2) == 0);
+  return true;
+}
+
+static bool testAddition()
+{
+  std::cout << "testAddition()\n";
+  {
+    ASSERT_TRUE(cm::String("a") + "b" == "ab");
+    ASSERT_TRUE("ab" == "a" + cm::String("b"));
+    ASSERT_TRUE("a" + cm::String("b") + "c" == "abc");
+    ASSERT_TRUE("abc" == "a" + cm::String("b") + "c");
+    ASSERT_TRUE("a" + (cm::String("b") + "c") + "d" == "abcd");
+    ASSERT_TRUE("abcd" == "a" + (cm::String("b") + "c") + "d");
+  }
+  {
+    ASSERT_TRUE(cm::String("a"_s) + "b"_s == "ab"_s);
+    ASSERT_TRUE("ab"_s == "a"_s + cm::String("b"_s));
+    ASSERT_TRUE("a"_s + cm::String("b"_s) + "c"_s == "abc"_s);
+    ASSERT_TRUE("abc"_s == "a"_s + cm::String("b"_s) + "c"_s);
+    ASSERT_TRUE("a"_s + (cm::String("b"_s) + "c"_s) + "d"_s == "abcd"_s);
+    ASSERT_TRUE("abcd"_s == "a"_s + (cm::String("b"_s) + "c"_s) + "d"_s);
+  }
+  {
+    const char* a = "a";
+    const char* b = "b";
+    const char* ab = "ab";
+    ASSERT_TRUE(cm::String(a) + b == ab);
+    ASSERT_TRUE(ab == a + cm::String(b));
+    const char* c = "c";
+    const char* abc = "abc";
+    ASSERT_TRUE(a + cm::String(b) + c == abc);
+    ASSERT_TRUE(abc == a + cm::String(b) + c);
+    const char* d = "d";
+    const char* abcd = "abcd";
+    ASSERT_TRUE(a + (cm::String(b) + c) + d == abcd);
+    ASSERT_TRUE(abcd == a + (cm::String(b) + c) + d);
+  }
+  {
+    ASSERT_TRUE(cm::String('a') + 'b' == "ab");
+    ASSERT_TRUE("ab" == 'a' + cm::String('b'));
+    ASSERT_TRUE('a' + cm::String('b') + 'c' == "abc");
+    ASSERT_TRUE("abc" == 'a' + cm::String('b') + 'c');
+    ASSERT_TRUE('a' + (cm::String('b') + 'c') + 'd' == "abcd");
+    ASSERT_TRUE("abcd" == 'a' + (cm::String('b') + 'c') + 'd');
+  }
+  {
+    std::string a = "a";
+    std::string b = "b";
+    std::string ab = "ab";
+    ASSERT_TRUE(cm::String(a) + b == ab);
+    ASSERT_TRUE(ab == a + cm::String(b));
+    std::string c = "c";
+    std::string abc = "abc";
+    ASSERT_TRUE(a + cm::String(b) + c == abc);
+    ASSERT_TRUE(abc == a + cm::String(b) + c);
+    std::string d = "d";
+    std::string abcd = "abcd";
+    ASSERT_TRUE(a + (cm::String(b) + c) + d == abcd);
+    ASSERT_TRUE(abcd == a + (cm::String(b) + c) + d);
+  }
+  {
+    cm::string_view a("a", 1);
+    cm::string_view b("b", 1);
+    cm::string_view ab("ab", 2);
+    ASSERT_TRUE(cm::String(a) + b == ab);
+    ASSERT_TRUE(ab == a + cm::String(b));
+    cm::string_view c("c", 1);
+    cm::string_view abc("abc", 3);
+    ASSERT_TRUE(a + cm::String(b) + c == abc);
+    ASSERT_TRUE(abc == a + cm::String(b) + c);
+    cm::string_view d("d", 1);
+    cm::string_view abcd("abcd", 4);
+    ASSERT_TRUE(a + (cm::String(b) + c) + d == abcd);
+    ASSERT_TRUE(abcd == a + (cm::String(b) + c) + d);
+  }
+  {
+    cm::String a = "a";
+    cm::String b = "b";
+    cm::String ab = "ab";
+    ASSERT_TRUE(a + b == ab);
+    ASSERT_TRUE(ab == a + b);
+    cm::String c = "c";
+    cm::String abc = "abc";
+    ASSERT_TRUE(a + cm::String(b) + c == abc);
+    ASSERT_TRUE(abc == a + cm::String(b) + c);
+    cm::String d = "d";
+    cm::String abcd = "abcd";
+    ASSERT_TRUE(a + (cm::String(b) + c) + d == abcd);
+    ASSERT_TRUE(abcd == a + (cm::String(b) + c) + d);
+  }
+  {
+    cm::String str;
+    str += "a" + cm::String("b") + 'c';
+    ASSERT_TRUE(str == "abc");
+    ASSERT_TRUE(str.is_stable());
+  }
+  {
+    std::string s;
+    s += "a" + cm::String("b") + 'c';
+    ASSERT_TRUE(s == "abc");
+  }
+  {
+    std::ostringstream ss;
+    ss << ("a" + cm::String("b") + 'c');
+    ASSERT_TRUE(ss.str() == "abc");
+  }
+  return true;
+}
+
+static bool testStability()
+{
+  std::cout << "testStability()\n";
+  cm::String str = "abc"_s;
+  ASSERT_TRUE(!str.is_stable());
+  ASSERT_TRUE(str.str_if_stable() == nullptr);
+  str.stabilize();
+  ASSERT_TRUE(str.is_stable());
+  std::string const* str_if_stable = str.str_if_stable();
+  ASSERT_TRUE(str_if_stable != nullptr);
+  ASSERT_TRUE(*str_if_stable == "abc");
+  str.stabilize();
+  ASSERT_TRUE(str.is_stable());
+  ASSERT_TRUE(str.str_if_stable() == str_if_stable);
+  return true;
+}
+
+int testString(int /*unused*/, char* /*unused*/ [])
+{
+  if (!testConstructDefault()) {
+    return 1;
+  }
+  if (!testConstructFromNullPtr()) {
+    return 1;
+  }
+  if (!testConstructFromCStrNull()) {
+    return 1;
+  }
+  if (!testConstructFromCharArray()) {
+    return 1;
+  }
+  if (!testConstructFromCStr()) {
+    return 1;
+  }
+  if (!testConstructFromStdString()) {
+    return 1;
+  }
+  if (!testConstructFromView()) {
+    return 1;
+  }
+  if (!testConstructFromChar()) {
+    return 1;
+  }
+  if (!testConstructFromInitList()) {
+    return 1;
+  }
+  if (!testConstructFromBuffer()) {
+    return 1;
+  }
+  if (!testConstructFromInputIterator()) {
+    return 1;
+  }
+  if (!testConstructFromN()) {
+    return 1;
+  }
+  if (!testConstructFromStaticStringView()) {
+    return 1;
+  }
+  if (!testConstructCopy()) {
+    return 1;
+  }
+  if (!testConstructMove()) {
+    return 1;
+  }
+  if (!testAssignCopy()) {
+    return 1;
+  }
+  if (!testAssignMove()) {
+    return 1;
+  }
+  if (!testAssignFromChar()) {
+    return 1;
+  }
+  if (!testAssignFromView()) {
+    return 1;
+  }
+  if (!testAssignFromStdString()) {
+    return 1;
+  }
+  if (!testAssignFromCStr()) {
+    return 1;
+  }
+  if (!testAssignFromCharArray()) {
+    return 1;
+  }
+  if (!testAssignFromCStrNull()) {
+    return 1;
+  }
+  if (!testAssignFromNullPtr()) {
+    return 1;
+  }
+  if (!testAssignFromInitList()) {
+    return 1;
+  }
+  if (!testAssignFromStaticStringView()) {
+    return 1;
+  }
+  if (!testOperatorBool()) {
+    return 1;
+  }
+  if (!testOperatorIndex()) {
+    return 1;
+  }
+  if (!testOperatorPlusEqual()) {
+    return 1;
+  }
+  if (!testOperatorCompare()) {
+    return 1;
+  }
+  if (!testOperatorStream()) {
+    return 1;
+  }
+  if (!testOperatorStdStringPlusEqual()) {
+    return 1;
+  }
+  if (!testMethod_borrow()) {
+    return 1;
+  }
+  if (!testMethod_view()) {
+    return 1;
+  }
+  if (!testMethod_empty()) {
+    return 1;
+  }
+  if (!testMethod_length()) {
+    return 1;
+  }
+  if (!testMethod_at()) {
+    return 1;
+  }
+  if (!testMethod_front_back()) {
+    return 1;
+  }
+  if (!testMethod_clear()) {
+    return 1;
+  }
+  if (!testMethod_insert()) {
+    return 1;
+  }
+  if (!testMethod_erase()) {
+    return 1;
+  }
+  if (!testMethod_push_back()) {
+    return 1;
+  }
+  if (!testMethod_pop_back()) {
+    return 1;
+  }
+  if (!testMethod_replace()) {
+    return 1;
+  }
+  if (!testMethod_copy()) {
+    return 1;
+  }
+  if (!testMethod_resize()) {
+    return 1;
+  }
+  if (!testMethod_swap()) {
+    return 1;
+  }
+  if (!testMethodIterators()) {
+    return 1;
+  }
+  if (!testMethod_substr_AtEndBorrowed()) {
+    return 1;
+  }
+  if (!testMethod_substr_AtEndOwned()) {
+    return 1;
+  }
+  if (!testMethod_substr_AtStartBorrowed()) {
+    return 1;
+  }
+  if (!testMethod_substr_AtStartOwned()) {
+    return 1;
+  }
+  if (!testMethod_compare()) {
+    return 1;
+  }
+  if (!testMethod_find()) {
+    return 1;
+  }
+  if (!testMethod_rfind()) {
+    return 1;
+  }
+  if (!testMethod_find_first_of()) {
+    return 1;
+  }
+  if (!testMethod_find_first_not_of()) {
+    return 1;
+  }
+  if (!testMethod_find_last_of()) {
+    return 1;
+  }
+  if (!testMethod_find_last_not_of()) {
+    return 1;
+  }
+  if (!testAddition()) {
+    return 1;
+  }
+  if (!testStability()) {
+    return 1;
+  }
+  return 0;
+}
diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index 5ff2538..67fd65a 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -66,6 +66,9 @@
   endforeach()
 endfunction()
 
+# Some tests use python for extra checks.
+find_package(PythonInterp QUIET)
+
 if(XCODE_VERSION AND "${XCODE_VERSION}" VERSION_LESS 6.1)
   set(Swift_ARGS -DXCODE_BELOW_6_1=1)
 endif()
@@ -155,6 +158,7 @@
 add_RunCMake_test(ExternalData)
 add_RunCMake_test(FeatureSummary)
 add_RunCMake_test(FPHSA)
+add_RunCMake_test(FileAPI -DPYTHON_EXECUTABLE=${PYTHON_EXECUTABLE})
 add_RunCMake_test(FindBoost)
 add_RunCMake_test(FindLua)
 add_RunCMake_test(FindOpenGL)
diff --git a/Tests/RunCMake/FileAPI/CMakeLists.txt b/Tests/RunCMake/FileAPI/CMakeLists.txt
new file mode 100644
index 0000000..44025d3
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 3.12)
+project(${RunCMake_TEST} NONE)
+include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/FileAPI/ClientStateful-check.cmake b/Tests/RunCMake/FileAPI/ClientStateful-check.cmake
new file mode 100644
index 0000000..1e9aab6
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/ClientStateful-check.cmake
@@ -0,0 +1,68 @@
+set(expect
+  query
+  query/client-client-member
+  query/client-client-member/query.json
+  query/client-empty-array
+  query/client-empty-array/query.json
+  query/client-empty-object
+  query/client-empty-object/query.json
+  query/client-json-bad-root
+  query/client-json-bad-root/query.json
+  query/client-json-empty
+  query/client-json-empty/query.json
+  query/client-json-extra
+  query/client-json-extra/query.json
+  query/client-not-file
+  query/client-not-file/query.json
+  query/client-request-array-negative-major-version
+  query/client-request-array-negative-major-version/query.json
+  query/client-request-array-negative-minor-version
+  query/client-request-array-negative-minor-version/query.json
+  query/client-request-array-negative-version
+  query/client-request-array-negative-version/query.json
+  query/client-request-array-no-major-version
+  query/client-request-array-no-major-version/query.json
+  query/client-request-array-no-supported-version
+  query/client-request-array-no-supported-version-among
+  query/client-request-array-no-supported-version-among/query.json
+  query/client-request-array-no-supported-version/query.json
+  query/client-request-array-version-1
+  query/client-request-array-version-1-1
+  query/client-request-array-version-1-1/query.json
+  query/client-request-array-version-1/query.json
+  query/client-request-array-version-2
+  query/client-request-array-version-2/query.json
+  query/client-request-negative-major-version
+  query/client-request-negative-major-version/query.json
+  query/client-request-negative-minor-version
+  query/client-request-negative-minor-version/query.json
+  query/client-request-negative-version
+  query/client-request-negative-version/query.json
+  query/client-request-no-major-version
+  query/client-request-no-major-version/query.json
+  query/client-request-no-version
+  query/client-request-no-version/query.json
+  query/client-request-version-1
+  query/client-request-version-1-1
+  query/client-request-version-1-1/query.json
+  query/client-request-version-1/query.json
+  query/client-request-version-2
+  query/client-request-version-2/query.json
+  query/client-requests-bad
+  query/client-requests-bad/query.json
+  query/client-requests-empty
+  query/client-requests-empty/query.json
+  query/client-requests-not-kinded
+  query/client-requests-not-kinded/query.json
+  query/client-requests-not-objects
+  query/client-requests-not-objects/query.json
+  query/client-requests-unknown
+  query/client-requests-unknown/query.json
+  reply
+  reply/__test-v1-[0-9a-f]+.json
+  reply/__test-v2-[0-9a-f]+.json
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(ClientStateful)
diff --git a/Tests/RunCMake/FileAPI/ClientStateful-check.py b/Tests/RunCMake/FileAPI/ClientStateful-check.py
new file mode 100644
index 0000000..f3d20d1
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/ClientStateful-check.py
@@ -0,0 +1,258 @@
+from check_index import *
+
+def check_reply(q):
+    assert is_dict(q)
+    assert sorted(q.keys()) == [
+        "client-client-member",
+        "client-empty-array",
+        "client-empty-object",
+        "client-json-bad-root",
+        "client-json-empty",
+        "client-json-extra",
+        "client-not-file",
+        "client-request-array-negative-major-version",
+        "client-request-array-negative-minor-version",
+        "client-request-array-negative-version",
+        "client-request-array-no-major-version",
+        "client-request-array-no-supported-version",
+        "client-request-array-no-supported-version-among",
+        "client-request-array-version-1",
+        "client-request-array-version-1-1",
+        "client-request-array-version-2",
+        "client-request-negative-major-version",
+        "client-request-negative-minor-version",
+        "client-request-negative-version",
+        "client-request-no-major-version",
+        "client-request-no-version",
+        "client-request-version-1",
+        "client-request-version-1-1",
+        "client-request-version-2",
+        "client-requests-bad",
+        "client-requests-empty",
+        "client-requests-not-kinded",
+        "client-requests-not-objects",
+        "client-requests-unknown",
+    ]
+    expected = [
+        (check_query_client_member, "client-client-member"),
+        (check_query_empty_array, "client-empty-array"),
+        (check_query_empty_object, "client-empty-object"),
+        (check_query_json_bad_root, "client-json-bad-root"),
+        (check_query_json_empty, "client-json-empty"),
+        (check_query_json_extra, "client-json-extra"),
+        (check_query_not_file, "client-not-file"),
+        (check_query_requests_bad, "client-requests-bad"),
+        (check_query_requests_empty, "client-requests-empty"),
+        (check_query_requests_not_kinded, "client-requests-not-kinded"),
+        (check_query_requests_not_objects, "client-requests-not-objects"),
+        (check_query_requests_unknown, "client-requests-unknown"),
+    ]
+    for (f, k) in expected:
+        assert is_dict(q[k])
+        assert sorted(q[k].keys()) == ["query.json"]
+        f(q[k]["query.json"])
+    expected = [
+        (check_query_response_array_negative_major_version,     "client-request-array-negative-major-version"),
+        (check_query_response_array_negative_minor_version,     "client-request-array-negative-minor-version"),
+        (check_query_response_array_negative_version,           "client-request-array-negative-version"),
+        (check_query_response_array_no_major_version,           "client-request-array-no-major-version"),
+        (check_query_response_array_no_supported_version,       "client-request-array-no-supported-version"),
+        (check_query_response_array_no_supported_version_among, "client-request-array-no-supported-version-among"),
+        (check_query_response_array_version_1,                  "client-request-array-version-1"),
+        (check_query_response_array_version_1_1,                "client-request-array-version-1-1"),
+        (check_query_response_array_version_2,                  "client-request-array-version-2"),
+        (check_query_response_negative_major_version,           "client-request-negative-major-version"),
+        (check_query_response_negative_minor_version,           "client-request-negative-minor-version"),
+        (check_query_response_negative_version,                 "client-request-negative-version"),
+        (check_query_response_no_major_version,                 "client-request-no-major-version"),
+        (check_query_response_no_version,                       "client-request-no-version"),
+        (check_query_response_version_1,                        "client-request-version-1"),
+        (check_query_response_version_1_1,                      "client-request-version-1-1"),
+        (check_query_response_version_2,                        "client-request-version-2"),
+    ]
+    for (f, k) in expected:
+        assert is_dict(q[k])
+        assert sorted(q[k].keys()) == ["query.json"]
+        assert is_dict(q[k]["query.json"])
+        assert sorted(q[k]["query.json"].keys()) == ["requests", "responses"]
+        r = q[k]["query.json"]["requests"]
+        assert is_list(r)
+        assert len(r) == 1
+        assert is_dict(r[0])
+        assert r[0]["kind"] == "__test"
+        r = q[k]["query.json"]["responses"]
+        assert is_list(r)
+        assert len(r) == 1
+        assert is_dict(r[0])
+        f(r[0])
+
+def check_query_client_member(q):
+    assert is_dict(q)
+    assert sorted(q.keys()) == ["client", "responses"]
+    assert is_dict(q["client"])
+    assert sorted(q["client"].keys()) == []
+    check_error(q["responses"], "'requests' member missing")
+
+def check_query_empty_array(q):
+    check_error(q, "query root is not an object")
+
+def check_query_empty_object(q):
+    assert is_dict(q)
+    assert sorted(q.keys()) == ["responses"]
+    check_error(q["responses"], "'requests' member missing")
+
+def check_query_json_bad_root(q):
+    check_error_re(q, "A valid JSON document must be either an array or an object value")
+
+def check_query_json_empty(q):
+    check_error_re(q, "value, object or array expected")
+
+def check_query_json_extra(q):
+    check_error_re(q, "Extra non-whitespace after JSON value")
+
+def check_query_not_file(q):
+    check_error_re(q, "failed to read from file")
+
+def check_query_requests_bad(q):
+    assert is_dict(q)
+    assert sorted(q.keys()) == ["requests", "responses"]
+    r = q["requests"]
+    assert is_dict(r)
+    assert sorted(r.keys()) == []
+    check_error(q["responses"], "'requests' member is not an array")
+
+def check_query_requests_empty(q):
+    assert is_dict(q)
+    assert sorted(q.keys()) == ["requests", "responses"]
+    r = q["requests"]
+    assert is_list(r)
+    assert len(r) == 0
+    r = q["responses"]
+    assert is_list(r)
+    assert len(r) == 0
+
+def check_query_requests_not_kinded(q):
+    assert is_dict(q)
+    assert sorted(q.keys()) == ["requests", "responses"]
+    r = q["requests"]
+    assert is_list(r)
+    assert len(r) == 4
+    assert is_dict(r[0])
+    assert sorted(r[0].keys()) == []
+    assert is_dict(r[1])
+    assert sorted(r[1].keys()) == ["kind"]
+    assert is_dict(r[1]["kind"])
+    assert is_dict(r[2])
+    assert sorted(r[2].keys()) == ["kind"]
+    assert is_list(r[2]["kind"])
+    assert is_dict(r[3])
+    assert sorted(r[3].keys()) == ["kind"]
+    assert is_int(r[3]["kind"])
+    r = q["responses"]
+    assert is_list(r)
+    assert len(r) == 4
+    check_error(r[0], "'kind' member missing")
+    check_error(r[1], "'kind' member is not a string")
+    check_error(r[2], "'kind' member is not a string")
+    check_error(r[3], "'kind' member is not a string")
+
+def check_query_requests_not_objects(q):
+    assert is_dict(q)
+    assert sorted(q.keys()) == ["requests", "responses"]
+    r = q["requests"]
+    assert is_list(r)
+    assert len(r) == 3
+    assert is_int(r[0])
+    assert is_string(r[1])
+    assert is_list(r[2])
+    r = q["responses"]
+    assert is_list(r)
+    assert len(r) == 3
+    check_error(r[0], "request is not an object")
+    check_error(r[1], "request is not an object")
+    check_error(r[2], "request is not an object")
+
+def check_query_requests_unknown(q):
+    assert is_dict(q)
+    assert sorted(q.keys()) == ["requests", "responses"]
+    r = q["requests"]
+    assert is_list(r)
+    assert len(r) == 3
+    assert is_dict(r[0])
+    assert sorted(r[0].keys()) == ["kind"]
+    assert r[0]["kind"] == "unknownC"
+    assert is_dict(r[1])
+    assert sorted(r[1].keys()) == ["kind"]
+    assert r[1]["kind"] == "unknownB"
+    assert is_dict(r[2])
+    assert sorted(r[2].keys()) == ["kind"]
+    assert r[2]["kind"] == "unknownA"
+    r = q["responses"]
+    assert is_list(r)
+    assert len(r) == 3
+    check_error(r[0], "unknown request kind 'unknownC'")
+    check_error(r[1], "unknown request kind 'unknownB'")
+    check_error(r[2], "unknown request kind 'unknownA'")
+
+def check_query_response_array_negative_major_version(r):
+    check_error(r, "'version' object 'major' member is not a non-negative integer")
+
+def check_query_response_array_negative_minor_version(r):
+    check_error(r, "'version' object 'minor' member is not a non-negative integer")
+
+def check_query_response_array_negative_version(r):
+    check_error(r, "'version' array entry is not a non-negative integer or object")
+
+def check_query_response_array_no_major_version(r):
+    check_error(r, "'version' object 'major' member missing")
+
+def check_query_response_array_no_supported_version(r):
+    check_error(r, "no supported version specified")
+
+def check_query_response_array_no_supported_version_among(r):
+    check_error(r, "no supported version specified among: 4.0 3.0")
+
+def check_query_response_array_version_1(r):
+    check_index__test(r, 1, 3)
+
+def check_query_response_array_version_1_1(r):
+    check_index__test(r, 1, 3) # always uses latest minor version
+
+def check_query_response_array_version_2(r):
+    check_index__test(r, 2, 0)
+
+def check_query_response_negative_major_version(r):
+    check_error(r, "'version' object 'major' member is not a non-negative integer")
+
+def check_query_response_negative_minor_version(r):
+    check_error(r, "'version' object 'minor' member is not a non-negative integer")
+
+def check_query_response_negative_version(r):
+    check_error(r, "'version' member is not a non-negative integer, object, or array")
+
+def check_query_response_no_major_version(r):
+    check_error(r, "'version' object 'major' member missing")
+
+def check_query_response_no_version(r):
+    check_error(r, "'version' member missing")
+
+def check_query_response_version_1(r):
+    check_index__test(r, 1, 3)
+
+def check_query_response_version_1_1(r):
+    check_index__test(r, 1, 3) # always uses latest minor version
+
+def check_query_response_version_2(r):
+    check_index__test(r, 2, 0)
+
+def check_objects(o):
+    assert is_list(o)
+    assert len(o) == 2
+    check_index__test(o[0], 1, 3)
+    check_index__test(o[1], 2, 0)
+
+assert is_dict(index)
+assert sorted(index.keys()) == ["cmake", "objects", "reply"]
+check_cmake(index["cmake"])
+check_reply(index["reply"])
+check_objects(index["objects"])
diff --git a/Tests/RunCMake/FileAPI/ClientStateful-prep.cmake b/Tests/RunCMake/FileAPI/ClientStateful-prep.cmake
new file mode 100644
index 0000000..5b41d7a
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/ClientStateful-prep.cmake
@@ -0,0 +1,73 @@
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-client-member/query.json" [[{ "client": {} }]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-empty-array/query.json" "[]")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-empty-object/query.json" "{}")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-json-bad-root/query.json" [["invalid root"]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-json-empty/query.json" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-json-extra/query.json" "{}x")
+file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-not-file/query.json")
+
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-requests-bad/query.json" [[{ "requests": {} }]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-requests-empty/query.json" [[{ "requests": [] }]])
+
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-requests-not-objects/query.json" [[
+{ "requests": [ 0, "", [] ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-requests-not-kinded/query.json" [[
+{ "requests": [ {}, { "kind": {} }, { "kind": [] }, { "kind": 0 } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-requests-unknown/query.json" [[
+{ "requests": [ { "kind": "unknownC" }, { "kind": "unknownB" }, { "kind": "unknownA" } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-no-version/query.json" [[
+{ "requests": [ { "kind": "__test" } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-negative-version/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : -1 } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-no-major-version/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : {} } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-negative-major-version/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : { "major": -1 } } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-negative-minor-version/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : { "major": 0, "minor": -1 } } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-array-negative-version/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : [ 1, -1 ] } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-array-no-major-version/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : [ 1, {} ] } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-array-negative-major-version/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : [ 1, { "major": -1 } ] } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-array-negative-minor-version/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : [ 1, { "major": 0, "minor": -1 } ] } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-array-no-supported-version/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : [] } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-array-no-supported-version-among/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : [4, 3] } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-version-1/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : 1 } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-version-1-1/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : { "major": 1, "minor": 1 } } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-version-2/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : { "major": 2 } } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-array-version-1/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : [3, 1] } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-array-version-1-1/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : [3, { "major": 1, "minor": 1 }, 2 ] } ] }
+]])
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-request-array-version-2/query.json" [[
+{ "requests": [ { "kind": "__test", "version" : [3, { "major": 2 } ]  } ] }
+]])
+
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/reply/object-to-be-deleted.json" "")
diff --git a/Tests/RunCMake/FileAPI/ClientStateful.cmake b/Tests/RunCMake/FileAPI/ClientStateful.cmake
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/ClientStateful.cmake
diff --git a/Tests/RunCMake/FileAPI/ClientStateless-check.cmake b/Tests/RunCMake/FileAPI/ClientStateless-check.cmake
new file mode 100644
index 0000000..955d9be
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/ClientStateless-check.cmake
@@ -0,0 +1,15 @@
+set(expect
+  query
+  query/client-foo
+  query/client-foo/__test-v1
+  query/client-foo/__test-v2
+  query/client-foo/__test-v3
+  query/client-foo/unknown
+  reply
+  reply/__test-v1-[0-9a-f]+.json
+  reply/__test-v2-[0-9a-f]+.json
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(ClientStateless)
diff --git a/Tests/RunCMake/FileAPI/ClientStateless-check.py b/Tests/RunCMake/FileAPI/ClientStateless-check.py
new file mode 100644
index 0000000..b7da314
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/ClientStateless-check.py
@@ -0,0 +1,26 @@
+from check_index import *
+
+def check_reply(r):
+    assert is_dict(r)
+    assert sorted(r.keys()) == ["client-foo"]
+    check_reply_client_foo(r["client-foo"])
+
+def check_reply_client_foo(r):
+    assert is_dict(r)
+    assert sorted(r.keys()) == ["__test-v1", "__test-v2", "__test-v3", "unknown"]
+    check_index__test(r["__test-v1"], 1, 3)
+    check_index__test(r["__test-v2"], 2, 0)
+    check_error(r["__test-v3"], "unknown query file")
+    check_error(r["unknown"], "unknown query file")
+
+def check_objects(o):
+    assert is_list(o)
+    assert len(o) == 2
+    check_index__test(o[0], 1, 3)
+    check_index__test(o[1], 2, 0)
+
+assert is_dict(index)
+assert sorted(index.keys()) == ["cmake", "objects", "reply"]
+check_cmake(index["cmake"])
+check_reply(index["reply"])
+check_objects(index["objects"])
diff --git a/Tests/RunCMake/FileAPI/ClientStateless-prep.cmake b/Tests/RunCMake/FileAPI/ClientStateless-prep.cmake
new file mode 100644
index 0000000..1b8d772
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/ClientStateless-prep.cmake
@@ -0,0 +1,5 @@
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/__test-v1" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/__test-v2" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/__test-v3" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/unknown" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/reply/object-to-be-deleted.json" "")
diff --git a/Tests/RunCMake/FileAPI/ClientStateless.cmake b/Tests/RunCMake/FileAPI/ClientStateless.cmake
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/ClientStateless.cmake
diff --git a/Tests/RunCMake/FileAPI/DuplicateStateless-check.cmake b/Tests/RunCMake/FileAPI/DuplicateStateless-check.cmake
new file mode 100644
index 0000000..4959c1e
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/DuplicateStateless-check.cmake
@@ -0,0 +1,20 @@
+set(expect
+  query
+  query/__test-v1
+  query/__test-v2
+  query/__test-v3
+  query/client-foo
+  query/client-foo/__test-v1
+  query/client-foo/__test-v2
+  query/client-foo/__test-v3
+  query/client-foo/unknown
+  query/query.json
+  query/unknown
+  reply
+  reply/__test-v1-[0-9a-f]+.json
+  reply/__test-v2-[0-9a-f]+.json
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(DuplicateStateless)
diff --git a/Tests/RunCMake/FileAPI/DuplicateStateless-check.py b/Tests/RunCMake/FileAPI/DuplicateStateless-check.py
new file mode 100644
index 0000000..3335479
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/DuplicateStateless-check.py
@@ -0,0 +1,31 @@
+from check_index import *
+
+def check_reply(r):
+    assert is_dict(r)
+    assert sorted(r.keys()) == ["__test-v1", "__test-v2", "__test-v3", "client-foo", "query.json", "unknown"]
+    check_index__test(r["__test-v1"], 1, 3)
+    check_index__test(r["__test-v2"], 2, 0)
+    check_error(r["__test-v3"], "unknown query file")
+    check_reply_client_foo(r["client-foo"])
+    check_error(r["query.json"], "unknown query file")
+    check_error(r["unknown"], "unknown query file")
+
+def check_reply_client_foo(r):
+    assert is_dict(r)
+    assert sorted(r.keys()) == ["__test-v1", "__test-v2", "__test-v3", "unknown"]
+    check_index__test(r["__test-v1"], 1, 3)
+    check_index__test(r["__test-v2"], 2, 0)
+    check_error(r["__test-v3"], "unknown query file")
+    check_error(r["unknown"], "unknown query file")
+
+def check_objects(o):
+    assert is_list(o)
+    assert len(o) == 2
+    check_index__test(o[0], 1, 3)
+    check_index__test(o[1], 2, 0)
+
+assert is_dict(index)
+assert sorted(index.keys()) == ["cmake", "objects", "reply"]
+check_cmake(index["cmake"])
+check_reply(index["reply"])
+check_objects(index["objects"])
diff --git a/Tests/RunCMake/FileAPI/DuplicateStateless-prep.cmake b/Tests/RunCMake/FileAPI/DuplicateStateless-prep.cmake
new file mode 100644
index 0000000..51b9852
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/DuplicateStateless-prep.cmake
@@ -0,0 +1,10 @@
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/__test-v1" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/__test-v2" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/__test-v3" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/query.json" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/unknown" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/__test-v1" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/__test-v2" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/__test-v3" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/unknown" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/reply/object-to-be-deleted.json" "")
diff --git a/Tests/RunCMake/FileAPI/DuplicateStateless.cmake b/Tests/RunCMake/FileAPI/DuplicateStateless.cmake
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/DuplicateStateless.cmake
diff --git a/Tests/RunCMake/FileAPI/Empty-check.cmake b/Tests/RunCMake/FileAPI/Empty-check.cmake
new file mode 100644
index 0000000..2764b42
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/Empty-check.cmake
@@ -0,0 +1,8 @@
+set(expect
+  query
+  reply
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(Empty)
diff --git a/Tests/RunCMake/FileAPI/Empty-check.py b/Tests/RunCMake/FileAPI/Empty-check.py
new file mode 100644
index 0000000..75bf096
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/Empty-check.py
@@ -0,0 +1,15 @@
+from check_index import *
+
+def check_reply(r):
+    assert is_dict(r)
+    assert sorted(r.keys()) == []
+
+def check_objects(o):
+    assert is_list(o)
+    assert len(o) == 0
+
+assert is_dict(index)
+assert sorted(index.keys()) == ["cmake", "objects", "reply"]
+check_cmake(index["cmake"])
+check_reply(index["reply"])
+check_objects(index["objects"])
diff --git a/Tests/RunCMake/FileAPI/Empty-prep.cmake b/Tests/RunCMake/FileAPI/Empty-prep.cmake
new file mode 100644
index 0000000..1d1f69e
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/Empty-prep.cmake
@@ -0,0 +1 @@
+file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query")
diff --git a/Tests/RunCMake/FileAPI/Empty.cmake b/Tests/RunCMake/FileAPI/Empty.cmake
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/Empty.cmake
diff --git a/Tests/RunCMake/FileAPI/EmptyClient-check.cmake b/Tests/RunCMake/FileAPI/EmptyClient-check.cmake
new file mode 100644
index 0000000..4e5745c
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/EmptyClient-check.cmake
@@ -0,0 +1,9 @@
+set(expect
+  query
+  query/client-foo
+  reply
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(EmptyClient)
diff --git a/Tests/RunCMake/FileAPI/EmptyClient-check.py b/Tests/RunCMake/FileAPI/EmptyClient-check.py
new file mode 100644
index 0000000..f887908
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/EmptyClient-check.py
@@ -0,0 +1,20 @@
+from check_index import *
+
+def check_reply(r):
+    assert is_dict(r)
+    assert sorted(r.keys()) == ["client-foo"]
+    check_reply_client_foo(r["client-foo"])
+
+def check_reply_client_foo(r):
+    assert is_dict(r)
+    assert sorted(r.keys()) == []
+
+def check_objects(o):
+    assert is_list(o)
+    assert len(o) == 0
+
+assert is_dict(index)
+assert sorted(index.keys()) == ["cmake", "objects", "reply"]
+check_cmake(index["cmake"])
+check_reply(index["reply"])
+check_objects(index["objects"])
diff --git a/Tests/RunCMake/FileAPI/EmptyClient-prep.cmake b/Tests/RunCMake/FileAPI/EmptyClient-prep.cmake
new file mode 100644
index 0000000..31512fd
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/EmptyClient-prep.cmake
@@ -0,0 +1,2 @@
+file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/reply/object-to-be-deleted.json" "")
diff --git a/Tests/RunCMake/FileAPI/EmptyClient.cmake b/Tests/RunCMake/FileAPI/EmptyClient.cmake
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/EmptyClient.cmake
diff --git a/Tests/RunCMake/FileAPI/MixedStateless-check.cmake b/Tests/RunCMake/FileAPI/MixedStateless-check.cmake
new file mode 100644
index 0000000..5795614
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/MixedStateless-check.cmake
@@ -0,0 +1,16 @@
+set(expect
+  query
+  query/__test-v1
+  query/__test-v3
+  query/client-foo
+  query/client-foo/__test-v2
+  query/client-foo/unknown
+  query/query.json
+  reply
+  reply/__test-v1-[0-9a-f]+.json
+  reply/__test-v2-[0-9a-f]+.json
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(MixedStateless)
diff --git a/Tests/RunCMake/FileAPI/MixedStateless-check.py b/Tests/RunCMake/FileAPI/MixedStateless-check.py
new file mode 100644
index 0000000..be019ab
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/MixedStateless-check.py
@@ -0,0 +1,27 @@
+from check_index import *
+
+def check_reply(r):
+    assert is_dict(r)
+    assert sorted(r.keys()) == ["__test-v1", "__test-v3", "client-foo", "query.json"]
+    check_index__test(r["__test-v1"], 1, 3)
+    check_error(r["__test-v3"], "unknown query file")
+    check_reply_client_foo(r["client-foo"])
+    check_error(r["query.json"], "unknown query file")
+
+def check_reply_client_foo(r):
+    assert is_dict(r)
+    assert sorted(r.keys()) == ["__test-v2", "unknown"]
+    check_index__test(r["__test-v2"], 2, 0)
+    check_error(r["unknown"], "unknown query file")
+
+def check_objects(o):
+    assert is_list(o)
+    assert len(o) == 2
+    check_index__test(o[0], 1, 3)
+    check_index__test(o[1], 2, 0)
+
+assert is_dict(index)
+assert sorted(index.keys()) == ["cmake", "objects", "reply"]
+check_cmake(index["cmake"])
+check_reply(index["reply"])
+check_objects(index["objects"])
diff --git a/Tests/RunCMake/FileAPI/MixedStateless-prep.cmake b/Tests/RunCMake/FileAPI/MixedStateless-prep.cmake
new file mode 100644
index 0000000..030baac
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/MixedStateless-prep.cmake
@@ -0,0 +1,6 @@
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/__test-v1" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/__test-v2" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/__test-v3" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/query.json" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/unknown" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/reply/object-to-be-deleted.json" "")
diff --git a/Tests/RunCMake/FileAPI/MixedStateless.cmake b/Tests/RunCMake/FileAPI/MixedStateless.cmake
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/MixedStateless.cmake
diff --git a/Tests/RunCMake/FileAPI/Nothing-check.cmake b/Tests/RunCMake/FileAPI/Nothing-check.cmake
new file mode 100644
index 0000000..cd4f42e
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/Nothing-check.cmake
@@ -0,0 +1 @@
+check_api("^$")
diff --git a/Tests/RunCMake/FileAPI/Nothing-prep.cmake b/Tests/RunCMake/FileAPI/Nothing-prep.cmake
new file mode 100644
index 0000000..b850d47
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/Nothing-prep.cmake
@@ -0,0 +1 @@
+file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1")
diff --git a/Tests/RunCMake/FileAPI/Nothing.cmake b/Tests/RunCMake/FileAPI/Nothing.cmake
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/Nothing.cmake
diff --git a/Tests/RunCMake/FileAPI/RunCMakeTest.cmake b/Tests/RunCMake/FileAPI/RunCMakeTest.cmake
new file mode 100644
index 0000000..f8adb64
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/RunCMakeTest.cmake
@@ -0,0 +1,58 @@
+include(RunCMake)
+
+# Function called in *-check.cmake scripts to check api files.
+function(check_api expect)
+  file(GLOB_RECURSE actual
+    LIST_DIRECTORIES TRUE
+    RELATIVE ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1
+    ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/*
+    )
+  if(NOT "${actual}" MATCHES "${expect}")
+    set(RunCMake_TEST_FAILED "API files:
+  ${actual}
+do not match what we expected:
+  ${expect}
+in directory:
+  ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1" PARENT_SCOPE)
+  endif()
+endfunction()
+
+function(check_python case)
+  if(RunCMake_TEST_FAILED OR NOT PYTHON_EXECUTABLE)
+    return()
+  endif()
+  file(GLOB index ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/reply/index-*.json)
+  execute_process(
+    COMMAND ${PYTHON_EXECUTABLE} "${RunCMake_SOURCE_DIR}/${case}-check.py" "${index}"
+    RESULT_VARIABLE result
+    OUTPUT_VARIABLE output
+    ERROR_VARIABLE output
+    )
+  if(NOT result EQUAL 0)
+    string(REPLACE "\n" "\n  " output "  ${output}")
+    set(RunCMake_TEST_FAILED "Unexpected index:\n${output}" PARENT_SCOPE)
+  endif()
+endfunction()
+
+run_cmake(Nothing)
+run_cmake(Empty)
+run_cmake(EmptyClient)
+run_cmake(Stale)
+run_cmake(SharedStateless)
+run_cmake(ClientStateless)
+run_cmake(MixedStateless)
+run_cmake(DuplicateStateless)
+run_cmake(ClientStateful)
+
+function(run_object object)
+  set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/${object}-build)
+  run_cmake(${object})
+  set(RunCMake_TEST_NO_CLEAN 1)
+  run_cmake_command(${object}-SharedStateless ${CMAKE_COMMAND} .)
+  run_cmake_command(${object}-ClientStateless ${CMAKE_COMMAND} .)
+  run_cmake_command(${object}-ClientStateful ${CMAKE_COMMAND} .)
+endfunction()
+
+run_object(codemodel-v2)
+run_object(cache-v2)
+run_object(cmakeFiles-v1)
diff --git a/Tests/RunCMake/FileAPI/SharedStateless-check.cmake b/Tests/RunCMake/FileAPI/SharedStateless-check.cmake
new file mode 100644
index 0000000..7f3bb23
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/SharedStateless-check.cmake
@@ -0,0 +1,15 @@
+set(expect
+  query
+  query/__test-v1
+  query/__test-v2
+  query/__test-v3
+  query/query.json
+  query/unknown
+  reply
+  reply/__test-v1-[0-9a-f]+.json
+  reply/__test-v2-[0-9a-f]+.json
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(SharedStateless)
diff --git a/Tests/RunCMake/FileAPI/SharedStateless-check.py b/Tests/RunCMake/FileAPI/SharedStateless-check.py
new file mode 100644
index 0000000..79f52d7
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/SharedStateless-check.py
@@ -0,0 +1,22 @@
+from check_index import *
+
+def check_reply(r):
+    assert is_dict(r)
+    assert sorted(r.keys()) == ["__test-v1", "__test-v2", "__test-v3", "query.json", "unknown"]
+    check_index__test(r["__test-v1"], 1, 3)
+    check_index__test(r["__test-v2"], 2, 0)
+    check_error(r["__test-v3"], "unknown query file")
+    check_error(r["query.json"], "unknown query file")
+    check_error(r["unknown"], "unknown query file")
+
+def check_objects(o):
+    assert is_list(o)
+    assert len(o) == 2
+    check_index__test(o[0], 1, 3)
+    check_index__test(o[1], 2, 0)
+
+assert is_dict(index)
+assert sorted(index.keys()) == ["cmake", "objects", "reply"]
+check_cmake(index["cmake"])
+check_reply(index["reply"])
+check_objects(index["objects"])
diff --git a/Tests/RunCMake/FileAPI/SharedStateless-prep.cmake b/Tests/RunCMake/FileAPI/SharedStateless-prep.cmake
new file mode 100644
index 0000000..b280414
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/SharedStateless-prep.cmake
@@ -0,0 +1,6 @@
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/__test-v1" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/__test-v2" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/__test-v3" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/query.json" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/unknown" "")
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/reply/object-to-be-deleted.json" "")
diff --git a/Tests/RunCMake/FileAPI/SharedStateless.cmake b/Tests/RunCMake/FileAPI/SharedStateless.cmake
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/SharedStateless.cmake
diff --git a/Tests/RunCMake/FileAPI/Stale-check.cmake b/Tests/RunCMake/FileAPI/Stale-check.cmake
new file mode 100644
index 0000000..7ee2c9e
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/Stale-check.cmake
@@ -0,0 +1,4 @@
+set(expect
+  reply
+  )
+check_api("^${expect}$")
diff --git a/Tests/RunCMake/FileAPI/Stale-prep.cmake b/Tests/RunCMake/FileAPI/Stale-prep.cmake
new file mode 100644
index 0000000..e920925
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/Stale-prep.cmake
@@ -0,0 +1 @@
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/reply/object-to-be-deleted.json" "")
diff --git a/Tests/RunCMake/FileAPI/Stale.cmake b/Tests/RunCMake/FileAPI/Stale.cmake
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/Stale.cmake
diff --git a/Tests/RunCMake/FileAPI/alias/CMakeLists.txt b/Tests/RunCMake/FileAPI/alias/CMakeLists.txt
new file mode 100644
index 0000000..549307d
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/alias/CMakeLists.txt
@@ -0,0 +1,10 @@
+project(Alias)
+enable_language(CXX)
+
+add_library(c_alias_lib ALIAS c_lib)
+add_executable(c_alias_exe ../empty.c)
+target_link_libraries(c_alias_exe PRIVATE c_alias_lib)
+
+add_library(cxx_alias_lib ALIAS cxx_lib)
+add_executable(cxx_alias_exe ../empty.cxx)
+target_link_libraries(cxx_alias_exe PRIVATE cxx_alias_lib)
diff --git a/Tests/RunCMake/FileAPI/cache-v2-ClientStateful-check.cmake b/Tests/RunCMake/FileAPI/cache-v2-ClientStateful-check.cmake
new file mode 100644
index 0000000..0f5ef28
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cache-v2-ClientStateful-check.cmake
@@ -0,0 +1,11 @@
+set(expect
+  query
+  query/client-foo
+  query/client-foo/query.json
+  reply
+  reply/cache-v2-[0-9a-f]+.json
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(cache-v2)
diff --git a/Tests/RunCMake/FileAPI/cache-v2-ClientStateful-prep.cmake b/Tests/RunCMake/FileAPI/cache-v2-ClientStateful-prep.cmake
new file mode 100644
index 0000000..9329280
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cache-v2-ClientStateful-prep.cmake
@@ -0,0 +1,4 @@
+file(REMOVE_RECURSE ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query)
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/query.json" [[
+{ "requests": [ { "kind": "cache", "version" : 2 } ] }
+]])
diff --git a/Tests/RunCMake/FileAPI/cache-v2-ClientStateless-check.cmake b/Tests/RunCMake/FileAPI/cache-v2-ClientStateless-check.cmake
new file mode 100644
index 0000000..c406ec8
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cache-v2-ClientStateless-check.cmake
@@ -0,0 +1,11 @@
+set(expect
+  query
+  query/client-foo
+  query/client-foo/cache-v2
+  reply
+  reply/cache-v2-[0-9a-f]+.json
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(cache-v2)
diff --git a/Tests/RunCMake/FileAPI/cache-v2-ClientStateless-prep.cmake b/Tests/RunCMake/FileAPI/cache-v2-ClientStateless-prep.cmake
new file mode 100644
index 0000000..dccafa5
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cache-v2-ClientStateless-prep.cmake
@@ -0,0 +1,2 @@
+file(REMOVE_RECURSE ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query)
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/cache-v2" "")
diff --git a/Tests/RunCMake/FileAPI/cache-v2-SharedStateless-check.cmake b/Tests/RunCMake/FileAPI/cache-v2-SharedStateless-check.cmake
new file mode 100644
index 0000000..f8337eb
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cache-v2-SharedStateless-check.cmake
@@ -0,0 +1,10 @@
+set(expect
+  query
+  query/cache-v2
+  reply
+  reply/cache-v2-[0-9a-f]+.json
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(cache-v2)
diff --git a/Tests/RunCMake/FileAPI/cache-v2-SharedStateless-prep.cmake b/Tests/RunCMake/FileAPI/cache-v2-SharedStateless-prep.cmake
new file mode 100644
index 0000000..ee5ac57
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cache-v2-SharedStateless-prep.cmake
@@ -0,0 +1,2 @@
+file(REMOVE_RECURSE ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query)
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/cache-v2" "")
diff --git a/Tests/RunCMake/FileAPI/cache-v2-check.py b/Tests/RunCMake/FileAPI/cache-v2-check.py
new file mode 100644
index 0000000..756ef80
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cache-v2-check.py
@@ -0,0 +1,134 @@
+from check_index import *
+
+def check_objects(o):
+    assert is_list(o)
+    assert len(o) == 1
+    check_index_object(o[0], "cache", 2, 0, check_object_cache)
+
+def check_cache_entry(actual, expected):
+    assert is_dict(actual)
+    assert sorted(actual.keys()) == ["name", "properties", "type", "value"]
+
+    assert is_string(actual["type"], expected["type"])
+    assert is_string(actual["value"], expected["value"])
+
+    def check_property(actual, expected):
+        assert is_dict(actual)
+        assert sorted(actual.keys()) == ["name", "value"]
+        assert is_string(actual["value"], expected["value"])
+
+    check_list_match(lambda a, e: is_string(a["name"], e["name"]), actual["properties"], expected["properties"], check=check_property)
+
+def check_object_cache(o):
+    assert sorted(o.keys()) == ["entries", "kind", "version"]
+    # The "kind" and "version" members are handled by check_index_object.
+    check_list_match(lambda a, e: is_string(a["name"], e["name"]), o["entries"], [
+        {
+            "name": "CM_OPTION_BOOL",
+            "type": "BOOL",
+            "value": "OFF",
+            "properties": [
+                {
+                    "name": "HELPSTRING",
+                    "value": "Testing option()",
+                },
+            ],
+        },
+        {
+            "name": "CM_SET_BOOL",
+            "type": "BOOL",
+            "value": "ON",
+            "properties": [
+                {
+                    "name": "HELPSTRING",
+                    "value": "Testing set(CACHE BOOL)",
+                },
+                {
+                    "name": "ADVANCED",
+                    "value": "1",
+                },
+            ],
+        },
+        {
+            "name": "CM_SET_FILEPATH",
+            "type": "FILEPATH",
+            "value": "dir1/dir2/empty.txt",
+            "properties": [
+                {
+                    "name": "HELPSTRING",
+                    "value": "Testing set(CACHE FILEPATH)",
+                },
+            ],
+        },
+        {
+            "name": "CM_SET_PATH",
+            "type": "PATH",
+            "value": "dir1/dir2",
+            "properties": [
+                {
+                    "name": "HELPSTRING",
+                    "value": "Testing set(CACHE PATH)",
+                },
+                {
+                    "name": "ADVANCED",
+                    "value": "ON",
+                },
+            ],
+        },
+        {
+            "name": "CM_SET_STRING",
+            "type": "STRING",
+            "value": "test",
+            "properties": [
+                {
+                    "name": "HELPSTRING",
+                    "value": "Testing set(CACHE STRING)",
+                },
+            ],
+        },
+        {
+            "name": "CM_SET_STRINGS",
+            "type": "STRING",
+            "value": "1",
+            "properties": [
+                {
+                    "name": "HELPSTRING",
+                    "value": "Testing set(CACHE STRING) with STRINGS",
+                },
+                {
+                    "name": "STRINGS",
+                    "value": "1;2;3;4",
+                },
+            ],
+        },
+        {
+            "name": "CM_SET_INTERNAL",
+            "type": "INTERNAL",
+            "value": "int2",
+            "properties": [
+                {
+                    "name": "HELPSTRING",
+                    "value": "Testing set(CACHE INTERNAL)",
+                },
+            ],
+        },
+        {
+            "name": "CM_SET_TYPE",
+            "type": "STRING",
+            "value": "1",
+            "properties": [
+                {
+                    "name": "HELPSTRING",
+                    "value": "Testing set(CACHE INTERNAL) with set_property(TYPE)",
+                },
+                {
+                    "name": "ADVANCED",
+                    "value": "0",
+                },
+            ],
+        },
+    ], check=check_cache_entry, allow_extra=True)
+
+assert is_dict(index)
+assert sorted(index.keys()) == ["cmake", "objects", "reply"]
+check_objects(index["objects"])
diff --git a/Tests/RunCMake/FileAPI/cache-v2.cmake b/Tests/RunCMake/FileAPI/cache-v2.cmake
new file mode 100644
index 0000000..45b402d
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cache-v2.cmake
@@ -0,0 +1,14 @@
+option(CM_OPTION_BOOL "Testing option()" "OFF")
+set(CM_SET_BOOL "ON" CACHE BOOL "Testing set(CACHE BOOL)")
+mark_as_advanced(CM_SET_BOOL)
+set(CM_SET_FILEPATH "dir1/dir2/empty.txt" CACHE FILEPATH "Testing set(CACHE FILEPATH)")
+set(CM_SET_PATH "dir1/dir2" CACHE PATH "Testing set(CACHE PATH)")
+set_property(CACHE CM_SET_PATH PROPERTY ADVANCED ON)
+set(CM_SET_STRING "test" CACHE STRING "Testing set(CACHE STRING)")
+set(CM_SET_STRINGS "1" CACHE STRING "Testing set(CACHE STRING) with STRINGS")
+set_property(CACHE CM_SET_STRINGS PROPERTY STRINGS "1;2;3;4")
+set(CM_SET_INTERNAL "int" CACHE INTERNAL "Testing set(CACHE INTERNAL)")
+set_property(CACHE CM_SET_INTERNAL PROPERTY VALUE "int2")
+set(CM_SET_TYPE "1" CACHE INTERNAL "Testing set(CACHE INTERNAL) with set_property(TYPE)")
+set_property(CACHE CM_SET_TYPE PROPERTY TYPE "STRING")
+set_property(CACHE CM_SET_TYPE PROPERTY ADVANCED "0")
diff --git a/Tests/RunCMake/FileAPI/check_index.py b/Tests/RunCMake/FileAPI/check_index.py
new file mode 100644
index 0000000..cda7234
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/check_index.py
@@ -0,0 +1,163 @@
+import sys
+import os
+import json
+import re
+
+if sys.version_info[0] >= 3:
+    unicode = str
+
+def is_bool(x, val=None):
+    return isinstance(x, bool) and (val is None or x == val)
+
+def is_dict(x):
+    return isinstance(x, dict)
+
+def is_list(x):
+    return isinstance(x, list)
+
+def is_int(x, val=None):
+    return (isinstance(x, int) or isinstance(x, long)) and (val is None or x == val)
+
+def is_string(x, val=None):
+    return (isinstance(x, str) or isinstance(x, unicode)) and (val is None or x == val)
+
+def matches(s, pattern):
+    return is_string(s) and bool(re.search(pattern, s))
+
+def check_list_match(match, actual, expected, check=None, check_exception=None, missing_exception=None, extra_exception=None, allow_extra=False):
+    """
+    Handle the common pattern of making sure every actual item "matches" some
+    item in the expected list, and that neither list has extra items after
+    matching is completed.
+
+    @param match: Callback to check if an actual item matches an expected
+    item. Return True if the item matches, return False if the item doesn't
+    match.
+    @param actual: List of actual items to search.
+    @param expected: List of expected items to match.
+    @param check: Optional function to check that the actual item is valid by
+    comparing it to the expected item.
+    @param check_exception: Optional function that returns an argument to
+    append to any exception thrown by the check function.
+    @param missing_exception: Optional function that returns an argument to
+    append to the exception thrown when an item is not found.
+    @param extra_exception: Optional function that returns an argument to
+    append to the exception thrown when an extra item is found.
+    @param allow_extra: Optional parameter allowing there to be extra actual
+    items after all the expected items have been found.
+    """
+    assert is_list(actual)
+    _actual = actual[:]
+    for expected_item in expected:
+        found = False
+        for i, actual_item in enumerate(_actual):
+            if match(actual_item, expected_item):
+                if check:
+                    try:
+                        check(actual_item, expected_item)
+                    except BaseException as e:
+                        if check_exception:
+                            e.args += (check_exception(actual_item, expected_item),)
+                        raise
+                found = True
+                del _actual[i]
+                break
+        if missing_exception:
+            assert found, missing_exception(expected_item)
+        else:
+            assert found
+    if not allow_extra:
+        if extra_exception:
+            assert len(_actual) == 0, [extra_exception(a) for a in _actual]
+        else:
+            assert len(_actual) == 0
+
+def filter_list(f, l):
+    if l is not None:
+        l = list(filter(f, l))
+    if l == []:
+        l = None
+    return l
+
+def check_cmake(cmake):
+    assert is_dict(cmake)
+    assert sorted(cmake.keys()) == ["generator", "paths", "version"]
+    check_cmake_version(cmake["version"])
+    check_cmake_paths(cmake["paths"])
+    check_cmake_generator(cmake["generator"])
+
+def check_cmake_version(v):
+    assert is_dict(v)
+    assert sorted(v.keys()) == ["isDirty", "major", "minor", "patch", "string", "suffix"]
+    assert is_string(v["string"])
+    assert is_int(v["major"])
+    assert is_int(v["minor"])
+    assert is_int(v["patch"])
+    assert is_string(v["suffix"])
+    assert is_bool(v["isDirty"])
+
+def check_cmake_paths(v):
+    assert is_dict(v)
+    assert sorted(v.keys()) == ["cmake", "cpack", "ctest", "root"]
+    assert is_string(v["cmake"])
+    assert is_string(v["cpack"])
+    assert is_string(v["ctest"])
+    assert is_string(v["root"])
+
+def check_cmake_generator(g):
+    assert is_dict(g)
+    name = g.get("name", None)
+    assert is_string(name)
+    if name.startswith("Visual Studio"):
+        assert sorted(g.keys()) == ["name", "platform"]
+        assert is_string(g["platform"])
+    else:
+        assert sorted(g.keys()) == ["name"]
+
+def check_index_object(indexEntry, kind, major, minor, check):
+    assert is_dict(indexEntry)
+    assert sorted(indexEntry.keys()) == ["jsonFile", "kind", "version"]
+    assert is_string(indexEntry["kind"])
+    assert indexEntry["kind"] == kind
+    assert is_dict(indexEntry["version"])
+    assert sorted(indexEntry["version"].keys()) == ["major", "minor"]
+    assert indexEntry["version"]["major"] == major
+    assert indexEntry["version"]["minor"] == minor
+    assert is_string(indexEntry["jsonFile"])
+    filepath = os.path.join(reply_dir, indexEntry["jsonFile"])
+    with open(filepath) as f:
+        object = json.load(f)
+    assert is_dict(object)
+    assert "kind" in object
+    assert is_string(object["kind"])
+    assert object["kind"] == kind
+    assert "version" in object
+    assert is_dict(object["version"])
+    assert sorted(object["version"].keys()) == ["major", "minor"]
+    assert object["version"]["major"] == major
+    assert object["version"]["minor"] == minor
+    if check:
+        check(object)
+
+def check_index__test(indexEntry, major, minor):
+    def check(object):
+        assert sorted(object.keys()) == ["kind", "version"]
+    check_index_object(indexEntry, "__test", major, minor, check)
+
+def check_error(value, error):
+    assert is_dict(value)
+    assert sorted(value.keys()) == ["error"]
+    assert is_string(value["error"])
+    assert value["error"] == error
+
+def check_error_re(value, error):
+    assert is_dict(value)
+    assert sorted(value.keys()) == ["error"]
+    assert is_string(value["error"])
+    assert re.search(error, value["error"])
+
+reply_index = sys.argv[1]
+reply_dir = os.path.dirname(reply_index)
+
+with open(reply_index) as f:
+    index = json.load(f)
diff --git a/Tests/RunCMake/FileAPI/cmakeFiles-v1-ClientStateful-check.cmake b/Tests/RunCMake/FileAPI/cmakeFiles-v1-ClientStateful-check.cmake
new file mode 100644
index 0000000..21e931e
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cmakeFiles-v1-ClientStateful-check.cmake
@@ -0,0 +1,11 @@
+set(expect
+  query
+  query/client-foo
+  query/client-foo/query.json
+  reply
+  reply/cmakeFiles-v1-[0-9a-f]+.json
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(cmakeFiles-v1)
diff --git a/Tests/RunCMake/FileAPI/cmakeFiles-v1-ClientStateful-prep.cmake b/Tests/RunCMake/FileAPI/cmakeFiles-v1-ClientStateful-prep.cmake
new file mode 100644
index 0000000..7a72696
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cmakeFiles-v1-ClientStateful-prep.cmake
@@ -0,0 +1,4 @@
+file(REMOVE_RECURSE ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query)
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/query.json" [[
+{ "requests": [ { "kind": "cmakeFiles", "version" : 1 } ] }
+]])
diff --git a/Tests/RunCMake/FileAPI/cmakeFiles-v1-ClientStateless-check.cmake b/Tests/RunCMake/FileAPI/cmakeFiles-v1-ClientStateless-check.cmake
new file mode 100644
index 0000000..2ce2e79
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cmakeFiles-v1-ClientStateless-check.cmake
@@ -0,0 +1,11 @@
+set(expect
+  query
+  query/client-foo
+  query/client-foo/cmakeFiles-v1
+  reply
+  reply/cmakeFiles-v1-[0-9a-f]+.json
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(cmakeFiles-v1)
diff --git a/Tests/RunCMake/FileAPI/cmakeFiles-v1-ClientStateless-prep.cmake b/Tests/RunCMake/FileAPI/cmakeFiles-v1-ClientStateless-prep.cmake
new file mode 100644
index 0000000..eb96491
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cmakeFiles-v1-ClientStateless-prep.cmake
@@ -0,0 +1,2 @@
+file(REMOVE_RECURSE ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query)
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/cmakeFiles-v1" "")
diff --git a/Tests/RunCMake/FileAPI/cmakeFiles-v1-SharedStateless-check.cmake b/Tests/RunCMake/FileAPI/cmakeFiles-v1-SharedStateless-check.cmake
new file mode 100644
index 0000000..6e3b49a
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cmakeFiles-v1-SharedStateless-check.cmake
@@ -0,0 +1,10 @@
+set(expect
+  query
+  query/cmakeFiles-v1
+  reply
+  reply/cmakeFiles-v1-[0-9a-f]+.json
+  reply/index-[0-9.T-]+.json
+  )
+check_api("^${expect}$")
+
+check_python(cmakeFiles-v1)
diff --git a/Tests/RunCMake/FileAPI/cmakeFiles-v1-SharedStateless-prep.cmake b/Tests/RunCMake/FileAPI/cmakeFiles-v1-SharedStateless-prep.cmake
new file mode 100644
index 0000000..8c8bdef
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cmakeFiles-v1-SharedStateless-prep.cmake
@@ -0,0 +1,2 @@
+file(REMOVE_RECURSE ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query)
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/cmakeFiles-v1" "")
diff --git a/Tests/RunCMake/FileAPI/cmakeFiles-v1-check.py b/Tests/RunCMake/FileAPI/cmakeFiles-v1-check.py
new file mode 100644
index 0000000..49dfe87
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cmakeFiles-v1-check.py
@@ -0,0 +1,94 @@
+from check_index import *
+
+def check_objects(o):
+    assert is_list(o)
+    assert len(o) == 1
+    check_index_object(o[0], "cmakeFiles", 1, 0, check_object_cmakeFiles)
+
+def check_input(actual, expected):
+    assert is_dict(actual)
+    expected_keys = ["path"]
+
+    if expected["isGenerated"] is not None:
+        expected_keys.append("isGenerated")
+        assert is_bool(actual["isGenerated"], expected["isGenerated"])
+
+    if expected["isExternal"] is not None:
+        expected_keys.append("isExternal")
+        assert is_bool(actual["isExternal"], expected["isExternal"])
+
+    if expected["isCMake"] is not None:
+        expected_keys.append("isCMake")
+        assert is_bool(actual["isCMake"], expected["isCMake"])
+
+    assert sorted(actual.keys()) == sorted(expected_keys)
+
+def check_object_cmakeFiles(o):
+    assert sorted(o.keys()) == ["inputs", "kind", "paths", "version"]
+    # The "kind" and "version" members are handled by check_index_object.
+    assert is_dict(o["paths"])
+    assert sorted(o["paths"].keys()) == ["build", "source"]
+    assert matches(o["paths"]["build"], "^.*/Tests/RunCMake/FileAPI/cmakeFiles-v1-build$")
+    assert matches(o["paths"]["source"], "^.*/Tests/RunCMake/FileAPI$")
+
+    expected = [
+        {
+            "path": "^CMakeLists\\.txt$",
+            "isGenerated": None,
+            "isExternal": None,
+            "isCMake": None,
+        },
+        {
+            "path": "^cmakeFiles-v1\\.cmake$",
+            "isGenerated": None,
+            "isExternal": None,
+            "isCMake": None,
+        },
+        {
+            "path": "^dir/CMakeLists\\.txt$",
+            "isGenerated": None,
+            "isExternal": None,
+            "isCMake": None,
+        },
+        {
+            "path": "^dir/dir/CMakeLists\\.txt$",
+            "isGenerated": None,
+            "isExternal": None,
+            "isCMake": None,
+        },
+        {
+            "path": "^dir/dirtest\\.cmake$",
+            "isGenerated": None,
+            "isExternal": None,
+            "isCMake": None,
+        },
+        {
+            "path": "^.*/Tests/RunCMake/FileAPIDummyFile\\.cmake$",
+            "isGenerated": None,
+            "isExternal": True,
+            "isCMake": None,
+        },
+        {
+            "path": "^.*/Tests/RunCMake/FileAPI/cmakeFiles-v1-build/generated\\.cmake",
+            "isGenerated": True,
+            "isExternal": None,
+            "isCMake": None,
+        },
+        {
+            "path": "^.*/Modules/CMakeParseArguments\\.cmake$",
+            "isGenerated": None,
+            "isExternal": True,
+            "isCMake": True,
+        },
+    ]
+
+    inSource = os.path.dirname(o["paths"]["build"]) == o["paths"]["source"]
+    if inSource:
+        for e in expected:
+            e["path"] = e["path"].replace("^.*/Tests/RunCMake/FileAPI/", "^", 1)
+
+    check_list_match(lambda a, e: matches(a["path"], e["path"]), o["inputs"], expected, check=check_input, allow_extra=True)
+
+assert is_dict(index)
+assert sorted(index.keys()) == ["cmake", "objects", "reply"]
+check_objects(index["objects"])
diff --git a/Tests/RunCMake/FileAPI/cmakeFiles-v1.cmake b/Tests/RunCMake/FileAPI/cmakeFiles-v1.cmake
new file mode 100644
index 0000000..4d4d757
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cmakeFiles-v1.cmake
@@ -0,0 +1,8 @@
+include("${CMAKE_CURRENT_LIST_DIR}/dir/dirtest.cmake")
+include(CMakeParseArguments)
+
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/generated.cmake" "")
+include("${CMAKE_CURRENT_BINARY_DIR}/generated.cmake")
+include("${CMAKE_CURRENT_LIST_DIR}/../FileAPIDummyFile.cmake")
+
+add_subdirectory(dir)
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-ClientStateful-check.cmake b/Tests/RunCMake/FileAPI/codemodel-v2-ClientStateful-check.cmake
new file mode 100644
index 0000000..fb78e87
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-ClientStateful-check.cmake
@@ -0,0 +1,12 @@
+set(expect
+  query
+  query/client-foo
+  query/client-foo/query.json
+  reply
+  reply/codemodel-v2-[0-9a-f]+\\.json
+  reply/index-[0-9.T-]+\\.json
+  .*
+  )
+check_api("^${expect}$")
+
+check_python(codemodel-v2)
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-ClientStateful-prep.cmake b/Tests/RunCMake/FileAPI/codemodel-v2-ClientStateful-prep.cmake
new file mode 100644
index 0000000..e2b38ff
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-ClientStateful-prep.cmake
@@ -0,0 +1,4 @@
+file(REMOVE_RECURSE ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query)
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/query.json" [[
+{ "requests": [ { "kind": "codemodel", "version" : 2 } ] }
+]])
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-ClientStateless-check.cmake b/Tests/RunCMake/FileAPI/codemodel-v2-ClientStateless-check.cmake
new file mode 100644
index 0000000..7c6a35a
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-ClientStateless-check.cmake
@@ -0,0 +1,12 @@
+set(expect
+  query
+  query/client-foo
+  query/client-foo/codemodel-v2
+  reply
+  reply/codemodel-v2-[0-9a-f]+\\.json
+  reply/index-[0-9.T-]+\\.json
+  .*
+  )
+check_api("^${expect}$")
+
+check_python(codemodel-v2)
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-ClientStateless-prep.cmake b/Tests/RunCMake/FileAPI/codemodel-v2-ClientStateless-prep.cmake
new file mode 100644
index 0000000..d1ce292
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-ClientStateless-prep.cmake
@@ -0,0 +1,2 @@
+file(REMOVE_RECURSE ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query)
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/client-foo/codemodel-v2" "")
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-SharedStateless-check.cmake b/Tests/RunCMake/FileAPI/codemodel-v2-SharedStateless-check.cmake
new file mode 100644
index 0000000..cc2f31b
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-SharedStateless-check.cmake
@@ -0,0 +1,11 @@
+set(expect
+  query
+  query/codemodel-v2
+  reply
+  reply/codemodel-v2-[0-9a-f]+\\.json
+  reply/index-[0-9.T-]+\\.json
+  .*
+  )
+check_api("^${expect}$")
+
+check_python(codemodel-v2)
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-SharedStateless-prep.cmake b/Tests/RunCMake/FileAPI/codemodel-v2-SharedStateless-prep.cmake
new file mode 100644
index 0000000..8a519d5
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-SharedStateless-prep.cmake
@@ -0,0 +1,2 @@
+file(REMOVE_RECURSE ${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query)
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/.cmake/api/v1/query/codemodel-v2" "")
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-check.py b/Tests/RunCMake/FileAPI/codemodel-v2-check.py
new file mode 100644
index 0000000..18b9347
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-check.py
@@ -0,0 +1,5085 @@
+from check_index import *
+
+import sys
+import os
+
+def check_objects(o, g):
+    assert is_list(o)
+    assert len(o) == 1
+    check_index_object(o[0], "codemodel", 2, 0, check_object_codemodel(g))
+
+def check_backtrace(t, b, backtrace):
+    btg = t["backtraceGraph"]
+    for expected in backtrace:
+        assert is_int(b)
+        node = btg["nodes"][b]
+        expected_keys = ["file"]
+        assert matches(btg["files"][node["file"]], expected["file"])
+
+        if expected["line"] is not None:
+            expected_keys.append("line")
+            assert is_int(node["line"], expected["line"])
+
+        if expected["command"] is not None:
+            expected_keys.append("command")
+            assert is_int(node["command"])
+            assert is_string(btg["commands"][node["command"]], expected["command"])
+
+        if expected["hasParent"]:
+            expected_keys.append("parent")
+            assert is_int(node["parent"])
+            b = node["parent"]
+        else:
+            b = None
+
+        assert sorted(node.keys()) == sorted(expected_keys)
+
+    assert b is None
+
+def check_directory(c):
+    def _check(actual, expected):
+        assert is_dict(actual)
+        expected_keys = ["build", "source", "projectIndex"]
+        assert matches(actual["build"], expected["build"])
+
+        assert is_int(actual["projectIndex"])
+        assert is_string(c["projects"][actual["projectIndex"]]["name"], expected["projectName"])
+
+        if expected["parentSource"] is not None:
+            expected_keys.append("parentIndex")
+            assert is_int(actual["parentIndex"])
+            assert matches(c["directories"][actual["parentIndex"]]["source"], expected["parentSource"])
+
+        if expected["childSources"] is not None:
+            expected_keys.append("childIndexes")
+            check_list_match(lambda a, e: matches(c["directories"][a]["source"], e),
+                             actual["childIndexes"], expected["childSources"],
+                             missing_exception=lambda e: "Child source: %s" % e,
+                             extra_exception=lambda a: "Child source: %s" % a["source"])
+
+        if expected["targetIds"] is not None:
+            expected_keys.append("targetIndexes")
+            check_list_match(lambda a, e: matches(c["targets"][a]["id"], e),
+                             actual["targetIndexes"], expected["targetIds"],
+                             missing_exception=lambda e: "Target ID: %s" % e,
+                             extra_exception=lambda a: "Target ID: %s" % c["targets"][a]["id"])
+
+        if expected["minimumCMakeVersion"] is not None:
+            expected_keys.append("minimumCMakeVersion")
+            assert is_dict(actual["minimumCMakeVersion"])
+            assert sorted(actual["minimumCMakeVersion"].keys()) == ["string"]
+            assert is_string(actual["minimumCMakeVersion"]["string"], expected["minimumCMakeVersion"])
+
+        if expected["hasInstallRule"] is not None:
+            expected_keys.append("hasInstallRule")
+            assert is_bool(actual["hasInstallRule"], expected["hasInstallRule"])
+
+        assert sorted(actual.keys()) == sorted(expected_keys)
+
+    return _check
+
+def check_target_backtrace_graph(t):
+    btg = t["backtraceGraph"]
+    assert is_dict(btg)
+    assert sorted(btg.keys()) == ["commands", "files", "nodes"]
+    assert is_list(btg["commands"])
+
+    for c in btg["commands"]:
+        assert is_string(c)
+
+    for f in btg["files"]:
+        assert is_string(f)
+
+    for n in btg["nodes"]:
+        expected_keys = ["file"]
+        assert is_dict(n)
+        assert is_int(n["file"])
+        assert 0 <= n["file"] < len(btg["files"])
+
+        if "line" in n:
+            expected_keys.append("line")
+            assert is_int(n["line"])
+
+        if "command" in n:
+            expected_keys.append("command")
+            assert is_int(n["command"])
+            assert 0 <= n["command"] < len(btg["commands"])
+
+        if "parent" in n:
+            expected_keys.append("parent")
+            assert is_int(n["parent"])
+            assert 0 <= n["parent"] < len(btg["nodes"])
+
+        assert sorted(n.keys()) == sorted(expected_keys)
+
+def check_target(c):
+    def _check(actual, expected):
+        assert is_dict(actual)
+        assert sorted(actual.keys()) == ["directoryIndex", "id", "jsonFile", "name", "projectIndex"]
+        assert is_int(actual["directoryIndex"])
+        assert matches(c["directories"][actual["directoryIndex"]]["source"], expected["directorySource"])
+        assert is_string(actual["name"], expected["name"])
+        assert is_string(actual["jsonFile"])
+        assert is_int(actual["projectIndex"])
+        assert is_string(c["projects"][actual["projectIndex"]]["name"], expected["projectName"])
+
+        filepath = os.path.join(reply_dir, actual["jsonFile"])
+        with open(filepath) as f:
+            obj = json.load(f)
+
+        expected_keys = ["name", "id", "type", "backtraceGraph", "paths", "sources"]
+        assert is_dict(obj)
+        assert is_string(obj["name"], expected["name"])
+        assert matches(obj["id"], expected["id"])
+        assert is_string(obj["type"], expected["type"])
+        check_target_backtrace_graph(obj)
+
+        assert is_dict(obj["paths"])
+        assert sorted(obj["paths"].keys()) == ["build", "source"]
+        assert matches(obj["paths"]["build"], expected["build"])
+        assert matches(obj["paths"]["source"], expected["source"])
+
+        def check_source(actual, expected):
+            assert is_dict(actual)
+            expected_keys = ["path"]
+
+            if expected["compileGroupLanguage"] is not None:
+                expected_keys.append("compileGroupIndex")
+                assert is_string(obj["compileGroups"][actual["compileGroupIndex"]]["language"], expected["compileGroupLanguage"])
+
+            if expected["sourceGroupName"] is not None:
+                expected_keys.append("sourceGroupIndex")
+                assert is_string(obj["sourceGroups"][actual["sourceGroupIndex"]]["name"], expected["sourceGroupName"])
+
+            if expected["isGenerated"] is not None:
+                expected_keys.append("isGenerated")
+                assert is_bool(actual["isGenerated"], expected["isGenerated"])
+
+            if expected["backtrace"] is not None:
+                expected_keys.append("backtrace")
+                check_backtrace(obj, actual["backtrace"], expected["backtrace"])
+
+            assert sorted(actual.keys()) == sorted(expected_keys)
+
+        check_list_match(lambda a, e: matches(a["path"], e["path"]), obj["sources"],
+                         expected["sources"], check=check_source,
+                         check_exception=lambda a, e: "Source file: %s" % a["path"],
+                         missing_exception=lambda e: "Source file: %s" % e["path"],
+                         extra_exception=lambda a: "Source file: %s" % a["path"])
+
+        if expected["backtrace"] is not None:
+            expected_keys.append("backtrace")
+            check_backtrace(obj, obj["backtrace"], expected["backtrace"])
+
+        if expected["folder"] is not None:
+            expected_keys.append("folder")
+            assert is_dict(obj["folder"])
+            assert sorted(obj["folder"].keys()) == ["name"]
+            assert is_string(obj["folder"]["name"], expected["folder"])
+
+        if expected["nameOnDisk"] is not None:
+            expected_keys.append("nameOnDisk")
+            assert matches(obj["nameOnDisk"], expected["nameOnDisk"])
+
+        if expected["artifacts"] is not None:
+            expected_keys.append("artifacts")
+
+            def check_artifact(actual, expected):
+                assert is_dict(actual)
+                assert sorted(actual.keys()) == ["path"]
+
+            check_list_match(lambda a, e: matches(a["path"], e["path"]),
+                             obj["artifacts"], expected["artifacts"],
+                             check=check_artifact,
+                             check_exception=lambda a, e: "Artifact: %s" % a["path"],
+                             missing_exception=lambda e: "Artifact: %s" % e["path"],
+                             extra_exception=lambda a: "Artifact: %s" % a["path"])
+
+        if expected["isGeneratorProvided"] is not None:
+            expected_keys.append("isGeneratorProvided")
+            assert is_bool(obj["isGeneratorProvided"], expected["isGeneratorProvided"])
+
+        if expected["install"] is not None:
+            expected_keys.append("install")
+            assert is_dict(obj["install"])
+            assert sorted(obj["install"].keys()) == ["destinations", "prefix"]
+
+            assert is_dict(obj["install"]["prefix"])
+            assert sorted(obj["install"]["prefix"].keys()) == ["path"]
+            assert matches(obj["install"]["prefix"]["path"], expected["install"]["prefix"])
+
+            def check_install_destination(actual, expected):
+                assert is_dict(actual)
+                expected_keys = ["path"]
+
+                if expected["backtrace"] is not None:
+                    expected_keys.append("backtrace")
+                    check_backtrace(obj, actual["backtrace"], expected["backtrace"])
+
+                assert sorted(actual.keys()) == sorted(expected_keys)
+
+            check_list_match(lambda a, e: matches(a["path"], e["path"]),
+                             obj["install"]["destinations"], expected["install"]["destinations"],
+                             check=check_install_destination,
+                             check_exception=lambda a, e: "Install path: %s" % a["path"],
+                             missing_exception=lambda e: "Install path: %s" % e["path"],
+                             extra_exception=lambda a: "Install path: %s" % a["path"])
+
+        if expected["link"] is not None:
+            expected_keys.append("link")
+            assert is_dict(obj["link"])
+            link_keys = ["language"]
+
+            assert is_string(obj["link"]["language"], expected["link"]["language"])
+
+            # FIXME: Properly test commandFragments
+            if "commandFragments" in obj["link"]:
+                link_keys.append("commandFragments")
+                assert is_list(obj["link"]["commandFragments"])
+                for f in obj["link"]["commandFragments"]:
+                    assert is_dict(f)
+                    assert sorted(f.keys()) == ["fragment", "role"]
+                    assert is_string(f["fragment"])
+                    assert is_string(f["role"])
+                    assert f["role"] in ("flags", "libraries", "libraryPath", "frameworkPath")
+
+            if expected["link"]["lto"] is not None:
+                link_keys.append("lto")
+                assert is_bool(obj["link"]["lto"], expected["link"]["lto"])
+
+            # FIXME: Properly test sysroot
+            if "sysroot" in obj["link"]:
+                link_keys.append("sysroot")
+                assert is_string(obj["link"]["sysroot"])
+
+            assert sorted(obj["link"].keys()) == sorted(link_keys)
+
+        if expected["archive"] is not None:
+            expected_keys.append("archive")
+            assert is_dict(obj["archive"])
+            archive_keys = []
+
+            # FIXME: Properly test commandFragments
+            if "commandFragments" in obj["archive"]:
+                archive_keys.append("commandFragments")
+                assert is_list(obj["archive"]["commandFragments"])
+                for f in obj["archive"]["commandFragments"]:
+                    assert is_dict(f)
+                    assert sorted(f.keys()) == ["fragment", "role"]
+                    assert is_string(f["fragment"])
+                    assert is_string(f["role"])
+                    assert f["role"] in ("flags")
+
+            if expected["archive"]["lto"] is not None:
+                archive_keys.append("lto")
+                assert is_bool(obj["archive"]["lto"], expected["archive"]["lto"])
+
+            assert sorted(obj["archive"].keys()) == sorted(archive_keys)
+
+        if expected["dependencies"] is not None:
+            expected_keys.append("dependencies")
+
+            def check_dependency(actual, expected):
+                assert is_dict(actual)
+                expected_keys = ["id"]
+
+                if expected["backtrace"] is not None:
+                    expected_keys.append("backtrace")
+                    check_backtrace(obj, actual["backtrace"], expected["backtrace"])
+
+                assert sorted(actual.keys()) == sorted(expected_keys)
+
+            check_list_match(lambda a, e: matches(a["id"], e["id"]),
+                             obj["dependencies"], expected["dependencies"],
+                             check=check_dependency,
+                             check_exception=lambda a, e: "Dependency ID: %s" % a["id"],
+                             missing_exception=lambda e: "Dependency ID: %s" % e["id"],
+                             extra_exception=lambda a: "Dependency ID: %s" % a["id"])
+
+        if expected["sourceGroups"] is not None:
+            expected_keys.append("sourceGroups")
+
+            def check_source_group(actual, expected):
+                assert is_dict(actual)
+                assert sorted(actual.keys()) == ["name", "sourceIndexes"]
+
+                check_list_match(lambda a, e: matches(obj["sources"][a]["path"], e),
+                                 actual["sourceIndexes"], expected["sourcePaths"],
+                                 missing_exception=lambda e: "Source path: %s" % e,
+                                 extra_exception=lambda a: "Source path: %s" % obj["sources"][a]["path"])
+
+            check_list_match(lambda a, e: is_string(a["name"], e["name"]),
+                             obj["sourceGroups"], expected["sourceGroups"],
+                             check=check_source_group,
+                             check_exception=lambda a, e: "Source group: %s" % a["name"],
+                             missing_exception=lambda e: "Source group: %s" % e["name"],
+                             extra_exception=lambda a: "Source group: %s" % a["name"])
+
+        if expected["compileGroups"] is not None:
+            expected_keys.append("compileGroups")
+
+            def check_compile_group(actual, expected):
+                assert is_dict(actual)
+                expected_keys = ["sourceIndexes", "language"]
+
+                check_list_match(lambda a, e: matches(obj["sources"][a]["path"], e),
+                                 actual["sourceIndexes"], expected["sourcePaths"],
+                                 missing_exception=lambda e: "Source path: %s" % e,
+                                 extra_exception=lambda a: "Source path: %s" % obj["sources"][a]["path"])
+
+                # FIXME: Properly test compileCommandFragments
+                if "compileCommandFragments" in actual:
+                    expected_keys.append("compileCommandFragments")
+                    assert is_list(actual["compileCommandFragments"])
+                    for f in actual["compileCommandFragments"]:
+                        assert is_dict(f)
+                        assert sorted(f.keys()) == ["fragment"]
+                        assert is_string(f["fragment"])
+
+                if expected["includes"] is not None:
+                    expected_keys.append("includes")
+
+                    def check_include(actual, expected):
+                        assert is_dict(actual)
+                        expected_keys = ["path"]
+
+                        if expected["isSystem"] is not None:
+                            expected_keys.append("isSystem")
+                            assert is_bool(actual["isSystem"], expected["isSystem"])
+
+                        if expected["backtrace"] is not None:
+                            expected_keys.append("backtrace")
+                            check_backtrace(obj, actual["backtrace"], expected["backtrace"])
+
+                        assert sorted(actual.keys()) == sorted(expected_keys)
+
+                    check_list_match(lambda a, e: matches(a["path"], e["path"]),
+                                     actual["includes"], expected["includes"],
+                                     check=check_include,
+                                     check_exception=lambda a, e: "Include path: %s" % a["path"],
+                                     missing_exception=lambda e: "Include path: %s" % e["path"],
+                                     extra_exception=lambda a: "Include path: %s" % a["path"])
+
+                if expected["defines"] is not None:
+                    expected_keys.append("defines")
+
+                    def check_define(actual, expected):
+                        assert is_dict(actual)
+                        expected_keys = ["define"]
+
+                        if expected["backtrace"] is not None:
+                            expected_keys.append("backtrace")
+                            check_backtrace(obj, actual["backtrace"], expected["backtrace"])
+
+                        assert sorted(actual.keys()) == sorted(expected_keys)
+
+                    check_list_match(lambda a, e: is_string(a["define"], e["define"]),
+                                     actual["defines"], expected["defines"],
+                                     check=check_define,
+                                     check_exception=lambda a, e: "Define: %s" % a["define"],
+                                     missing_exception=lambda e: "Define: %s" % e["define"],
+                                     extra_exception=lambda a: "Define: %s" % a["define"])
+
+                # FIXME: Properly test sysroot
+                if "sysroot" in actual:
+                    expected_keys.append("sysroot")
+                    assert is_string(actual["sysroot"])
+
+                assert sorted(actual.keys()) == sorted(expected_keys)
+
+            check_list_match(lambda a, e: is_string(a["language"], e["language"]),
+                             obj["compileGroups"], expected["compileGroups"],
+                             check=check_compile_group,
+                             check_exception=lambda a, e: "Compile group: %s" % a["language"],
+                             missing_exception=lambda e: "Compile group: %s" % e["language"],
+                             extra_exception=lambda a: "Compile group: %s" % a["language"])
+
+        assert sorted(obj.keys()) == sorted(expected_keys)
+
+    return _check
+
+def check_project(c):
+    def _check(actual, expected):
+        assert is_dict(actual)
+        expected_keys = ["name", "directoryIndexes"]
+
+        check_list_match(lambda a, e: matches(c["directories"][a]["source"], e),
+                         actual["directoryIndexes"], expected["directorySources"],
+                         missing_exception=lambda e: "Directory source: %s" % e,
+                         extra_exception=lambda a: "Directory source: %s" % c["directories"][a]["source"])
+
+        if expected["parentName"] is not None:
+            expected_keys.append("parentIndex")
+            assert is_int(actual["parentIndex"])
+            assert is_string(c["projects"][actual["parentIndex"]]["name"], expected["parentName"])
+
+        if expected["childNames"] is not None:
+            expected_keys.append("childIndexes")
+            check_list_match(lambda a, e: is_string(c["projects"][a]["name"], e),
+                             actual["childIndexes"], expected["childNames"],
+                             missing_exception=lambda e: "Child name: %s" % e,
+                             extra_exception=lambda a: "Child name: %s" % c["projects"][a]["name"])
+
+        if expected["targetIds"] is not None:
+            expected_keys.append("targetIndexes")
+            check_list_match(lambda a, e: matches(c["targets"][a]["id"], e),
+                             actual["targetIndexes"], expected["targetIds"],
+                             missing_exception=lambda e: "Target ID: %s" % e,
+                             extra_exception=lambda a: "Target ID: %s" % c["targets"][a]["id"])
+
+        assert sorted(actual.keys()) == sorted(expected_keys)
+
+    return _check
+
+def gen_check_directories(c, g):
+    expected = [
+        {
+            "source": "^\\.$",
+            "build": "^\\.$",
+            "parentSource": None,
+            "childSources": [
+                "^alias$",
+                "^custom$",
+                "^cxx$",
+                "^imported$",
+                "^object$",
+                "^.*/Tests/RunCMake/FileAPIExternalSource$",
+                "^dir$",
+            ],
+            "targetIds": [
+                "^ALL_BUILD::@6890427a1f51a3e7e1df$",
+                "^ZERO_CHECK::@6890427a1f51a3e7e1df$",
+                "^c_exe::@6890427a1f51a3e7e1df$",
+                "^c_lib::@6890427a1f51a3e7e1df$",
+                "^c_shared_exe::@6890427a1f51a3e7e1df$",
+                "^c_shared_lib::@6890427a1f51a3e7e1df$",
+                "^c_static_exe::@6890427a1f51a3e7e1df$",
+                "^c_static_lib::@6890427a1f51a3e7e1df$",
+                "^interface_exe::@6890427a1f51a3e7e1df$",
+            ],
+            "projectName": "codemodel-v2",
+            "minimumCMakeVersion": "3.12",
+            "hasInstallRule": True,
+        },
+        {
+            "source": "^alias$",
+            "build": "^alias$",
+            "parentSource": "^\\.$",
+            "childSources": None,
+            "targetIds": [
+                "^ALL_BUILD::@53632cba2752272bb008$",
+                "^ZERO_CHECK::@53632cba2752272bb008$",
+                "^c_alias_exe::@53632cba2752272bb008$",
+                "^cxx_alias_exe::@53632cba2752272bb008$",
+            ],
+            "projectName": "Alias",
+            "minimumCMakeVersion": "3.12",
+            "hasInstallRule": None,
+        },
+        {
+            "source": "^custom$",
+            "build": "^custom$",
+            "parentSource": "^\\.$",
+            "childSources": None,
+            "targetIds": [
+                "^ALL_BUILD::@c11385ffed57b860da63$",
+                "^ZERO_CHECK::@c11385ffed57b860da63$",
+                "^custom_exe::@c11385ffed57b860da63$",
+                "^custom_tgt::@c11385ffed57b860da63$",
+            ],
+            "projectName": "Custom",
+            "minimumCMakeVersion": "3.12",
+            "hasInstallRule": None,
+        },
+        {
+            "source": "^cxx$",
+            "build": "^cxx$",
+            "parentSource": "^\\.$",
+            "childSources": None,
+            "targetIds": [
+                "^ALL_BUILD::@a56b12a3f5c0529fb296$",
+                "^ZERO_CHECK::@a56b12a3f5c0529fb296$",
+                "^cxx_exe::@a56b12a3f5c0529fb296$",
+                "^cxx_lib::@a56b12a3f5c0529fb296$",
+                "^cxx_shared_exe::@a56b12a3f5c0529fb296$",
+                "^cxx_shared_lib::@a56b12a3f5c0529fb296$",
+                "^cxx_static_exe::@a56b12a3f5c0529fb296$",
+                "^cxx_static_lib::@a56b12a3f5c0529fb296$",
+            ],
+            "projectName": "Cxx",
+            "minimumCMakeVersion": "3.12",
+            "hasInstallRule": None,
+        },
+        {
+            "source": "^imported$",
+            "build": "^imported$",
+            "parentSource": "^\\.$",
+            "childSources": None,
+            "targetIds": [
+                "^ALL_BUILD::@ba7eb709d0b48779c6c8$",
+                "^ZERO_CHECK::@ba7eb709d0b48779c6c8$",
+                "^link_imported_exe::@ba7eb709d0b48779c6c8$",
+                "^link_imported_interface_exe::@ba7eb709d0b48779c6c8$",
+                "^link_imported_object_exe::@ba7eb709d0b48779c6c8$",
+                "^link_imported_shared_exe::@ba7eb709d0b48779c6c8$",
+                "^link_imported_static_exe::@ba7eb709d0b48779c6c8$",
+            ],
+            "projectName": "Imported",
+            "minimumCMakeVersion": "3.12",
+            "hasInstallRule": None,
+        },
+        {
+            "source": "^object$",
+            "build": "^object$",
+            "parentSource": "^\\.$",
+            "childSources": None,
+            "targetIds": [
+                "^ALL_BUILD::@5ed5358f70faf8d8af7a$",
+                "^ZERO_CHECK::@5ed5358f70faf8d8af7a$",
+                "^c_object_exe::@5ed5358f70faf8d8af7a$",
+                "^c_object_lib::@5ed5358f70faf8d8af7a$",
+                "^cxx_object_exe::@5ed5358f70faf8d8af7a$",
+                "^cxx_object_lib::@5ed5358f70faf8d8af7a$",
+            ],
+            "projectName": "Object",
+            "minimumCMakeVersion": "3.13",
+            "hasInstallRule": True,
+        },
+        {
+            "source": "^dir$",
+            "build": "^dir$",
+            "parentSource": "^\\.$",
+            "childSources": [
+                "^dir/dir$",
+            ],
+            "targetIds": None,
+            "projectName": "codemodel-v2",
+            "minimumCMakeVersion": "3.12",
+            "hasInstallRule": None,
+        },
+        {
+            "source": "^dir/dir$",
+            "build": "^dir/dir$",
+            "parentSource": "^dir$",
+            "childSources": None,
+            "targetIds": None,
+            "projectName": "codemodel-v2",
+            "minimumCMakeVersion": "3.12",
+            "hasInstallRule": None,
+        },
+        {
+            "source": "^.*/Tests/RunCMake/FileAPIExternalSource$",
+            "build": "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild$",
+            "parentSource": "^\\.$",
+            "childSources": None,
+            "targetIds": [
+                "^ALL_BUILD::@[0-9a-f]+$",
+                "^ZERO_CHECK::@[0-9a-f]+$",
+                "^generated_exe::@[0-9a-f]+$",
+            ],
+            "projectName": "External",
+            "minimumCMakeVersion": "3.12",
+            "hasInstallRule": None,
+        },
+    ]
+
+    if matches(g, "^Visual Studio "):
+        for e in expected:
+            if e["parentSource"] is not None:
+                e["targetIds"] = filter_list(lambda t: not matches(t, "^\\^ZERO_CHECK"), e["targetIds"])
+
+    elif g == "Xcode":
+        if ';' in os.environ.get("CMAKE_OSX_ARCHITECTURES", ""):
+            for e in expected:
+                e["targetIds"] = filter_list(lambda t: not matches(t, "^\\^(link_imported_object_exe)"), e["targetIds"])
+
+    else:
+        for e in expected:
+            e["targetIds"] = filter_list(lambda t: not matches(t, "^\\^(ALL_BUILD|ZERO_CHECK)"), e["targetIds"])
+
+    return expected
+
+def check_directories(c, g):
+    check_list_match(lambda a, e: matches(a["source"], e["source"]), c["directories"], gen_check_directories(c, g),
+                     check=check_directory(c),
+                     check_exception=lambda a, e: "Directory source: %s" % a["source"],
+                     missing_exception=lambda e: "Directory source: %s" % e["source"],
+                     extra_exception=lambda a: "Directory source: %s" % a["source"])
+
+def gen_check_targets(c, g, inSource):
+    expected = [
+        {
+            "name": "ALL_BUILD",
+            "id": "^ALL_BUILD::@6890427a1f51a3e7e1df$",
+            "directorySource": "^\\.$",
+            "projectName": "codemodel-v2",
+            "type": "UTILITY",
+            "isGeneratorProvided": True,
+            "sources": [
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/CMakeFiles/ALL_BUILD$",
+                    "isGenerated": True,
+                    "sourceGroupName": "",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/CMakeFiles/ALL_BUILD\\.rule$",
+                    "isGenerated": True,
+                    "sourceGroupName": "CMake Rules",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/CMakeFiles/ALL_BUILD$",
+                    ],
+                },
+                {
+                    "name": "CMake Rules",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/CMakeFiles/ALL_BUILD\\.rule$",
+                    ],
+                },
+            ],
+            "compileGroups": None,
+            "backtrace": [
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": None,
+            "artifacts": None,
+            "build": "^\\.$",
+            "source": "^\\.$",
+            "install": None,
+            "link": None,
+            "archive": None,
+            "dependencies": [
+                {
+                    "id": "^ZERO_CHECK::@6890427a1f51a3e7e1df$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^interface_exe::@6890427a1f51a3e7e1df$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^c_lib::@6890427a1f51a3e7e1df$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^c_exe::@6890427a1f51a3e7e1df$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^c_shared_lib::@6890427a1f51a3e7e1df$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^c_shared_exe::@6890427a1f51a3e7e1df$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^c_static_lib::@6890427a1f51a3e7e1df$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^c_static_exe::@6890427a1f51a3e7e1df$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^c_alias_exe::@53632cba2752272bb008$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^cxx_alias_exe::@53632cba2752272bb008$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^cxx_lib::@a56b12a3f5c0529fb296$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^cxx_exe::@a56b12a3f5c0529fb296$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^cxx_shared_lib::@a56b12a3f5c0529fb296$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^cxx_shared_exe::@a56b12a3f5c0529fb296$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^cxx_static_lib::@a56b12a3f5c0529fb296$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^cxx_static_exe::@a56b12a3f5c0529fb296$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^c_object_lib::@5ed5358f70faf8d8af7a$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^c_object_exe::@5ed5358f70faf8d8af7a$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^cxx_object_lib::@5ed5358f70faf8d8af7a$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^cxx_object_exe::@5ed5358f70faf8d8af7a$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^link_imported_exe::@ba7eb709d0b48779c6c8$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^link_imported_shared_exe::@ba7eb709d0b48779c6c8$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^link_imported_static_exe::@ba7eb709d0b48779c6c8$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^link_imported_object_exe::@ba7eb709d0b48779c6c8$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^link_imported_interface_exe::@ba7eb709d0b48779c6c8$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^custom_exe::@c11385ffed57b860da63$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^generated_exe::@[0-9a-f]+$",
+                    "backtrace": None,
+                },
+            ],
+        },
+        {
+            "name": "ZERO_CHECK",
+            "id": "^ZERO_CHECK::@6890427a1f51a3e7e1df$",
+            "directorySource": "^\\.$",
+            "projectName": "codemodel-v2",
+            "type": "UTILITY",
+            "isGeneratorProvided": True,
+            "sources": [
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/CMakeFiles/ZERO_CHECK$",
+                    "isGenerated": True,
+                    "sourceGroupName": "",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/CMakeFiles/ZERO_CHECK\\.rule$",
+                    "isGenerated": True,
+                    "sourceGroupName": "CMake Rules",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/CMakeFiles/ZERO_CHECK$",
+                    ],
+                },
+                {
+                    "name": "CMake Rules",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/CMakeFiles/ZERO_CHECK\\.rule$",
+                    ],
+                },
+            ],
+            "compileGroups": None,
+            "backtrace": [
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": None,
+            "artifacts": None,
+            "build": "^\\.$",
+            "source": "^\\.$",
+            "install": None,
+            "link": None,
+            "archive": None,
+            "dependencies": None,
+        },
+        {
+            "name": "interface_exe",
+            "id": "^interface_exe::@6890427a1f51a3e7e1df$",
+            "directorySource": "^\\.$",
+            "projectName": "codemodel-v2",
+            "type": "EXECUTABLE",
+            "isGeneratorProvided": None,
+            "sources": [
+                {
+                    "path": "^empty\\.c$",
+                    "isGenerated": None,
+                    "sourceGroupName": "Source Files",
+                    "compileGroupLanguage": "C",
+                    "backtrace": [
+                        {
+                            "file": "^include_test\\.cmake$",
+                            "line": 3,
+                            "command": "add_executable",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^include_test\\.cmake$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^codemodel-v2\\.cmake$",
+                            "line": 3,
+                            "command": "include",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^codemodel-v2\\.cmake$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": 3,
+                            "command": "include",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "Source Files",
+                    "sourcePaths": [
+                        "^empty\\.c$",
+                    ],
+                },
+            ],
+            "compileGroups": [
+                {
+                    "language": "C",
+                    "sourcePaths": [
+                        "^empty\\.c$",
+                    ],
+                    "includes": None,
+                    "defines": [
+                        {
+                            "define": "interface_exe_EXPORTS",
+                            "backtrace": None,
+                        },
+                    ],
+                },
+            ],
+            "backtrace": [
+                {
+                    "file": "^include_test\\.cmake$",
+                    "line": 3,
+                    "command": "add_executable",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^include_test\\.cmake$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": True,
+                },
+                {
+                    "file": "^codemodel-v2\\.cmake$",
+                    "line": 3,
+                    "command": "include",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^codemodel-v2\\.cmake$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": True,
+                },
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": 3,
+                    "command": "include",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": "^my_interface_exe\\.myexe$",
+            "artifacts": [
+                {
+                    "path": "^bin/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?my_interface_exe\\.myexe$",
+                    "_dllExtra": False,
+                },
+                {
+                    "path": "^lib/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?(lib)?my_interface_exe\\.(dll\\.a|lib)$",
+                    "_dllExtra": True,
+                },
+                {
+                    "path": "^bin/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?my_interface_exe\\.pdb$",
+                    "_dllExtra": True,
+                },
+            ],
+            "build": "^\\.$",
+            "source": "^\\.$",
+            "install": None,
+            "link": {
+                "language": "C",
+                "lto": None,
+            },
+            "archive": None,
+            "dependencies": [
+                {
+                    "id": "^ZERO_CHECK::@6890427a1f51a3e7e1df$",
+                    "backtrace": None,
+                },
+            ],
+        },
+        {
+            "name": "c_lib",
+            "id": "^c_lib::@6890427a1f51a3e7e1df$",
+            "directorySource": "^\\.$",
+            "projectName": "codemodel-v2",
+            "type": "STATIC_LIBRARY",
+            "isGeneratorProvided": None,
+            "sources": [
+                {
+                    "path": "^empty\\.c$",
+                    "isGenerated": None,
+                    "sourceGroupName": "Source Files",
+                    "compileGroupLanguage": "C",
+                    "backtrace": [
+                        {
+                            "file": "^codemodel-v2\\.cmake$",
+                            "line": 5,
+                            "command": "add_library",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^codemodel-v2\\.cmake$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": 3,
+                            "command": "include",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "Source Files",
+                    "sourcePaths": [
+                        "^empty\\.c$",
+                    ],
+                },
+            ],
+            "compileGroups": [
+                {
+                    "language": "C",
+                    "sourcePaths": [
+                        "^empty\\.c$",
+                    ],
+                    "includes": None,
+                    "defines": None,
+                },
+            ],
+            "backtrace": [
+                {
+                    "file": "^codemodel-v2\\.cmake$",
+                    "line": 5,
+                    "command": "add_library",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^codemodel-v2\\.cmake$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": True,
+                },
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": 3,
+                    "command": "include",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": "^(lib)?c_lib\\.(a|lib)$",
+            "artifacts": [
+                {
+                    "path": "^((Debug|Release|RelWithDebInfo|MinSizeRel)/)?(lib)?c_lib\\.(a|lib)$",
+                    "_dllExtra": False,
+                },
+            ],
+            "build": "^\\.$",
+            "source": "^\\.$",
+            "install": None,
+            "link": None,
+            "archive": {
+                "lto": None,
+            },
+            "dependencies": [
+                {
+                    "id": "^ZERO_CHECK::@6890427a1f51a3e7e1df$",
+                    "backtrace": None,
+                },
+            ],
+        },
+        {
+            "name": "c_exe",
+            "id": "^c_exe::@6890427a1f51a3e7e1df$",
+            "directorySource": "^\\.$",
+            "projectName": "codemodel-v2",
+            "type": "EXECUTABLE",
+            "isGeneratorProvided": None,
+            "sources": [
+                {
+                    "path": "^empty\\.c$",
+                    "isGenerated": None,
+                    "sourceGroupName": "Source Files",
+                    "compileGroupLanguage": "C",
+                    "backtrace": [
+                        {
+                            "file": "^codemodel-v2\\.cmake$",
+                            "line": 6,
+                            "command": "add_executable",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^codemodel-v2\\.cmake$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": 3,
+                            "command": "include",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "Source Files",
+                    "sourcePaths": [
+                        "^empty\\.c$",
+                    ],
+                },
+            ],
+            "compileGroups": [
+                {
+                    "language": "C",
+                    "sourcePaths": [
+                        "^empty\\.c$",
+                    ],
+                    "includes": None,
+                    "defines": None,
+                },
+            ],
+            "backtrace": [
+                {
+                    "file": "^codemodel-v2\\.cmake$",
+                    "line": 6,
+                    "command": "add_executable",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^codemodel-v2\\.cmake$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": True,
+                },
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": 3,
+                    "command": "include",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": "^c_exe(\\.exe)?$",
+            "artifacts": [
+                {
+                    "path": "^((Debug|Release|RelWithDebInfo|MinSizeRel)/)?c_exe(\\.exe)?$",
+                    "_dllExtra": False,
+                },
+                {
+                    "path": "^((Debug|Release|RelWithDebInfo|MinSizeRel)/)?c_exe\\.pdb$",
+                    "_dllExtra": True,
+                },
+            ],
+            "build": "^\\.$",
+            "source": "^\\.$",
+            "install": None,
+            "link": {
+                "language": "C",
+                "lto": None,
+            },
+            "archive": None,
+            "dependencies": [
+                {
+                    "id": "^c_lib::@6890427a1f51a3e7e1df$",
+                    "backtrace": [
+                        {
+                            "file": "^codemodel-v2\\.cmake$",
+                            "line": 7,
+                            "command": "target_link_libraries",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^codemodel-v2\\.cmake$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": 3,
+                            "command": "include",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+                {
+                    "id": "^ZERO_CHECK::@6890427a1f51a3e7e1df$",
+                    "backtrace": None,
+                },
+            ],
+        },
+        {
+            "name": "c_shared_lib",
+            "id": "^c_shared_lib::@6890427a1f51a3e7e1df$",
+            "directorySource": "^\\.$",
+            "projectName": "codemodel-v2",
+            "type": "SHARED_LIBRARY",
+            "isGeneratorProvided": None,
+            "sources": [
+                {
+                    "path": "^empty\\.c$",
+                    "isGenerated": None,
+                    "sourceGroupName": "Source Files",
+                    "compileGroupLanguage": "C",
+                    "backtrace": [
+                        {
+                            "file": "^codemodel-v2\\.cmake$",
+                            "line": 9,
+                            "command": "add_library",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^codemodel-v2\\.cmake$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": 3,
+                            "command": "include",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "Source Files",
+                    "sourcePaths": [
+                        "^empty\\.c$",
+                    ],
+                },
+            ],
+            "compileGroups": [
+                {
+                    "language": "C",
+                    "sourcePaths": [
+                        "^empty\\.c$",
+                    ],
+                    "includes": None,
+                    "defines": [
+                        {
+                            "define": "c_shared_lib_EXPORTS",
+                            "backtrace": None,
+                        },
+                    ],
+                },
+            ],
+            "backtrace": [
+                {
+                    "file": "^codemodel-v2\\.cmake$",
+                    "line": 9,
+                    "command": "add_library",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^codemodel-v2\\.cmake$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": True,
+                },
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": 3,
+                    "command": "include",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": "^(lib|cyg)?c_shared_lib\\.(so|dylib|dll)$",
+            "artifacts": [
+                {
+                    "path": "^lib/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?(lib|cyg)?c_shared_lib\\.(so|dylib|dll)$",
+                    "_dllExtra": False,
+                },
+                {
+                    "path": "^((Debug|Release|RelWithDebInfo|MinSizeRel)/)?(lib)?c_shared_lib\\.(dll\\.a|lib)$",
+                    "_dllExtra": True,
+                },
+                {
+                    "path": "^lib/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?(lib|cyg)?c_shared_lib\\.pdb$",
+                    "_dllExtra": True,
+                },
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+                    "id": "^c_object_exe::@5ed5358f70faf8d8af7a$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^cxx_object_lib::@5ed5358f70faf8d8af7a$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^cxx_object_exe::@5ed5358f70faf8d8af7a$",
+                    "backtrace": None,
+                },
+            ],
+        },
+        {
+            "name": "ZERO_CHECK",
+            "id": "^ZERO_CHECK::@5ed5358f70faf8d8af7a$",
+            "directorySource": "^object$",
+            "projectName": "Object",
+            "type": "UTILITY",
+            "isGeneratorProvided": True,
+            "sources": [
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+                    "path": "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/object/CMakeFiles/ZERO_CHECK$",
+                    "isGenerated": True,
+                    "sourceGroupName": "",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/object/CMakeFiles/ZERO_CHECK\\.rule$",
+                    "isGenerated": True,
+                    "sourceGroupName": "CMake Rules",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
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+            "backtrace": [
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+                    "line": None,
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+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": None,
+            "artifacts": None,
+            "build": "^object$",
+            "source": "^object$",
+            "install": None,
+            "link": None,
+            "archive": None,
+            "dependencies": None,
+        },
+        {
+            "name": "c_object_lib",
+            "id": "^c_object_lib::@5ed5358f70faf8d8af7a$",
+            "directorySource": "^object$",
+            "projectName": "Object",
+            "type": "OBJECT_LIBRARY",
+            "isGeneratorProvided": None,
+            "sources": [
+                {
+                    "path": "^empty\\.c$",
+                    "isGenerated": None,
+                    "sourceGroupName": "Source Files",
+                    "compileGroupLanguage": "C",
+                    "backtrace": [
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": 5,
+                            "command": "add_library",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "Source Files",
+                    "sourcePaths": [
+                        "^empty\\.c$",
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+                },
+            ],
+            "compileGroups": [
+                {
+                    "language": "C",
+                    "sourcePaths": [
+                        "^empty\\.c$",
+                    ],
+                    "includes": None,
+                    "defines": None,
+                },
+            ],
+            "backtrace": [
+                {
+                    "file": "^object/CMakeLists\\.txt$",
+                    "line": 5,
+                    "command": "add_library",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^object/CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": None,
+            "artifacts": [
+                {
+                    "path": "^object/.*/empty(\\.c)?\\.o(bj)?$",
+                    "_dllExtra": False,
+                },
+            ],
+            "build": "^object$",
+            "source": "^object$",
+            "install": None,
+            "link": None,
+            "archive": None,
+            "dependencies": [
+                {
+                    "id": "^ZERO_CHECK::@5ed5358f70faf8d8af7a$",
+                    "backtrace": None,
+                },
+            ],
+        },
+        {
+            "name": "c_object_exe",
+            "id": "^c_object_exe::@5ed5358f70faf8d8af7a$",
+            "directorySource": "^object$",
+            "projectName": "Object",
+            "type": "EXECUTABLE",
+            "isGeneratorProvided": None,
+            "sources": [
+                {
+                    "path": "^empty\\.c$",
+                    "isGenerated": None,
+                    "sourceGroupName": "Source Files",
+                    "compileGroupLanguage": "C",
+                    "backtrace": [
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": 6,
+                            "command": "add_executable",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/object/.*/empty(\\.c)?\\.o(bj)?$",
+                    "isGenerated": True,
+                    "sourceGroupName": "Object Libraries",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": 7,
+                            "command": "target_link_libraries",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "Source Files",
+                    "sourcePaths": [
+                        "^empty\\.c$",
+                    ],
+                },
+                {
+                    "name": "Object Libraries",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/object/.*/empty(\\.c)?\\.o(bj)?$",
+                    ],
+                },
+            ],
+            "compileGroups": [
+                {
+                    "language": "C",
+                    "sourcePaths": [
+                        "^empty\\.c$",
+                    ],
+                    "includes": None,
+                    "defines": None,
+                },
+            ],
+            "backtrace": [
+                {
+                    "file": "^object/CMakeLists\\.txt$",
+                    "line": 6,
+                    "command": "add_executable",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^object/CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": "^c_object_exe(\\.exe)?$",
+            "artifacts": [
+                {
+                    "path": "^object/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?c_object_exe(\\.exe)?$",
+                    "_dllExtra": False,
+                },
+                {
+                    "path": "^object/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?c_object_exe\\.pdb$",
+                    "_dllExtra": True,
+                },
+            ],
+            "build": "^object$",
+            "source": "^object$",
+            "install": {
+                "prefix": "^(/usr/local|[A-Za-z]:.*/codemodel-v2)$",
+                "destinations": [
+                    {
+                        "path": "bin",
+                        "backtrace": [
+                            {
+                                "file": "^object/CMakeLists\\.txt$",
+                                "line": 13,
+                                "command": "install",
+                                "hasParent": True,
+                            },
+                            {
+                                "file": "^object/CMakeLists\\.txt$",
+                                "line": None,
+                                "command": None,
+                                "hasParent": False,
+                            },
+                        ],
+                    },
+                ],
+            },
+            "link": {
+                "language": "C",
+                "lto": None,
+            },
+            "archive": None,
+            "dependencies": [
+                {
+                    "id": "^c_object_lib::@5ed5358f70faf8d8af7a$",
+                    # FIXME: Add a backtrace here when it becomes available.
+                    # You'll know when it's available, because this test will
+                    # fail.
+                    "backtrace": None,
+                },
+                {
+                    "id": "^ZERO_CHECK::@5ed5358f70faf8d8af7a$",
+                    "backtrace": None,
+                },
+            ],
+        },
+        {
+            "name": "cxx_object_lib",
+            "id": "^cxx_object_lib::@5ed5358f70faf8d8af7a$",
+            "directorySource": "^object$",
+            "projectName": "Object",
+            "type": "OBJECT_LIBRARY",
+            "isGeneratorProvided": None,
+            "sources": [
+                {
+                    "path": "^empty\\.cxx$",
+                    "isGenerated": None,
+                    "sourceGroupName": "Source Files",
+                    "compileGroupLanguage": "CXX",
+                    "backtrace": [
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": 9,
+                            "command": "add_library",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "Source Files",
+                    "sourcePaths": [
+                        "^empty\\.cxx$",
+                    ],
+                },
+            ],
+            "compileGroups": [
+                {
+                    "language": "CXX",
+                    "sourcePaths": [
+                        "^empty\\.cxx$",
+                    ],
+                    "includes": None,
+                    "defines": None,
+                },
+            ],
+            "backtrace": [
+                {
+                    "file": "^object/CMakeLists\\.txt$",
+                    "line": 9,
+                    "command": "add_library",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^object/CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": None,
+            "artifacts": [
+                {
+                    "path": "^object/.*/empty(\\.cxx)?\\.o(bj)?$",
+                    "_dllExtra": False,
+                },
+            ],
+            "build": "^object$",
+            "source": "^object$",
+            "install": None,
+            "link": None,
+            "archive": None,
+            "dependencies": [
+                {
+                    "id": "^ZERO_CHECK::@5ed5358f70faf8d8af7a$",
+                    "backtrace": None,
+                },
+            ],
+        },
+        {
+            "name": "cxx_object_exe",
+            "id": "^cxx_object_exe::@5ed5358f70faf8d8af7a$",
+            "directorySource": "^object$",
+            "projectName": "Object",
+            "type": "EXECUTABLE",
+            "isGeneratorProvided": None,
+            "sources": [
+                {
+                    "path": "^empty\\.cxx$",
+                    "isGenerated": None,
+                    "sourceGroupName": "Source Files",
+                    "compileGroupLanguage": "CXX",
+                    "backtrace": [
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": 10,
+                            "command": "add_executable",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/object/.*/empty(\\.cxx)?\\.o(bj)?$",
+                    "isGenerated": True,
+                    "sourceGroupName": "Object Libraries",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": 11,
+                            "command": "target_link_libraries",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^object/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "Source Files",
+                    "sourcePaths": [
+                        "^empty\\.cxx$",
+                    ],
+                },
+                {
+                    "name": "Object Libraries",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/object/.*/empty(\\.cxx)?\\.o(bj)?$",
+                    ],
+                },
+            ],
+            "compileGroups": [
+                {
+                    "language": "CXX",
+                    "sourcePaths": [
+                        "^empty\\.cxx$",
+                    ],
+                    "includes": None,
+                    "defines": None,
+                },
+            ],
+            "backtrace": [
+                {
+                    "file": "^object/CMakeLists\\.txt$",
+                    "line": 10,
+                    "command": "add_executable",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^object/CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": "^cxx_object_exe(\\.exe)?$",
+            "artifacts": [
+                {
+                    "path": "^object/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?cxx_object_exe(\\.exe)?$",
+                    "_dllExtra": False,
+                },
+                {
+                    "path": "^object/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?cxx_object_exe\\.pdb$",
+                    "_dllExtra": True,
+                },
+            ],
+            "build": "^object$",
+            "source": "^object$",
+            "install": {
+                "prefix": "^(/usr/local|[A-Za-z]:.*/codemodel-v2)$",
+                "destinations": [
+                    {
+                        "path": "bin",
+                        "backtrace": [
+                            {
+                                "file": "^object/CMakeLists\\.txt$",
+                                "line": 13,
+                                "command": "install",
+                                "hasParent": True,
+                            },
+                            {
+                                "file": "^object/CMakeLists\\.txt$",
+                                "line": None,
+                                "command": None,
+                                "hasParent": False,
+                            },
+                        ],
+                    },
+                ],
+            },
+            "link": {
+                "language": "CXX",
+                "lto": None,
+            },
+            "archive": None,
+            "dependencies": [
+                {
+                    "id": "^cxx_object_lib::@5ed5358f70faf8d8af7a$",
+                    # FIXME: Add a backtrace here when it becomes available.
+                    # You'll know when it's available, because this test will
+                    # fail.
+                    "backtrace": None,
+                },
+                {
+                    "id": "^ZERO_CHECK::@5ed5358f70faf8d8af7a$",
+                    "backtrace": None,
+                },
+            ],
+        },
+        {
+            "name": "ALL_BUILD",
+            "id": "^ALL_BUILD::@ba7eb709d0b48779c6c8$",
+            "directorySource": "^imported$",
+            "projectName": "Imported",
+            "type": "UTILITY",
+            "isGeneratorProvided": True,
+            "sources": [
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+                    "path": "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/imported/CMakeFiles/ALL_BUILD$",
+                    "isGenerated": True,
+                    "sourceGroupName": "",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^imported/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/imported/CMakeFiles/ALL_BUILD\\.rule$",
+                    "isGenerated": True,
+                    "sourceGroupName": "CMake Rules",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^imported/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
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+                {
+                    "name": "CMake Rules",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/imported/CMakeFiles/ALL_BUILD\\.rule$",
+                    ],
+                },
+            ],
+            "compileGroups": None,
+            "backtrace": [
+                {
+                    "file": "^imported/CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": None,
+            "artifacts": None,
+            "build": "^imported$",
+            "source": "^imported$",
+            "install": None,
+            "link": None,
+            "archive": None,
+            "dependencies": [
+                {
+                    "id": "^ZERO_CHECK::@ba7eb709d0b48779c6c8$",
+                    "backtrace": None,
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+                {
+                    "id": "^link_imported_exe::@ba7eb709d0b48779c6c8$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^link_imported_shared_exe::@ba7eb709d0b48779c6c8$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^link_imported_static_exe::@ba7eb709d0b48779c6c8$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^link_imported_object_exe::@ba7eb709d0b48779c6c8$",
+                    "backtrace": None,
+                },
+                {
+                    "id": "^link_imported_interface_exe::@ba7eb709d0b48779c6c8$",
+                    "backtrace": None,
+                },
+            ],
+        },
+        {
+            "name": "ZERO_CHECK",
+            "id": "^ZERO_CHECK::@ba7eb709d0b48779c6c8$",
+            "directorySource": "^imported$",
+            "projectName": "Imported",
+            "type": "UTILITY",
+            "isGeneratorProvided": True,
+            "sources": [
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+                    "isGenerated": True,
+                    "sourceGroupName": "",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^imported/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/imported/CMakeFiles/ZERO_CHECK\\.rule$",
+                    "isGenerated": True,
+                    "sourceGroupName": "CMake Rules",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^imported/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
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+            "compileGroups": None,
+            "backtrace": [
+                {
+                    "file": "^imported/CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": None,
+            "artifacts": None,
+            "build": "^imported$",
+            "source": "^imported$",
+            "install": None,
+            "link": None,
+            "archive": None,
+            "dependencies": None,
+        },
+        {
+            "name": "link_imported_exe",
+            "id": "^link_imported_exe::@ba7eb709d0b48779c6c8$",
+            "directorySource": "^imported$",
+            "projectName": "Imported",
+            "type": "EXECUTABLE",
+            "isGeneratorProvided": None,
+            "sources": [
+                {
+                    "path": "^empty\\.c$",
+                    "isGenerated": None,
+                    "sourceGroupName": "Source Files",
+                    "compileGroupLanguage": "C",
+                    "backtrace": [
+                        {
+                            "file": "^imported/CMakeLists\\.txt$",
+                            "line": 5,
+                            "command": "add_executable",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^imported/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "Source Files",
+                    "sourcePaths": [
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+            "compileGroups": [
+                {
+                    "language": "C",
+                    "sourcePaths": [
+                        "^empty\\.c$",
+                    ],
+                    "includes": None,
+                    "defines": None,
+                },
+            ],
+            "backtrace": [
+                {
+                    "file": "^imported/CMakeLists\\.txt$",
+                    "line": 5,
+                    "command": "add_executable",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^imported/CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": "^link_imported_exe(\\.exe)?$",
+            "artifacts": [
+                {
+                    "path": "^imported/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?link_imported_exe(\\.exe)?$",
+                    "_dllExtra": False,
+                },
+                {
+                    "path": "^imported/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?link_imported_exe\\.pdb$",
+                    "_dllExtra": True,
+                },
+            ],
+            "build": "^imported$",
+            "source": "^imported$",
+            "install": None,
+            "link": {
+                "language": "C",
+                "lto": None,
+            },
+            "archive": None,
+            "dependencies": [
+                {
+                    "id": "^ZERO_CHECK::@ba7eb709d0b48779c6c8$",
+                    "backtrace": None,
+                },
+            ],
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+                    "path": "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild/CMakeFiles/ZERO_CHECK$",
+                    "isGenerated": True,
+                    "sourceGroupName": "",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild/CMakeFiles/ZERO_CHECK\\.rule$",
+                    "isGenerated": True,
+                    "sourceGroupName": "CMake Rules",
+                    "compileGroupLanguage": None,
+                    "backtrace": [
+                        {
+                            "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild/CMakeFiles/ZERO_CHECK$",
+                    ],
+                },
+                {
+                    "name": "CMake Rules",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild/CMakeFiles/ZERO_CHECK\\.rule$",
+                    ],
+                },
+            ],
+            "compileGroups": None,
+            "backtrace": [
+                {
+                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": None,
+            "artifacts": None,
+            "build": "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild$",
+            "source": "^.*/Tests/RunCMake/FileAPIExternalSource$",
+            "install": None,
+            "link": None,
+            "archive": None,
+            "dependencies": None,
+        },
+        {
+            "name": "generated_exe",
+            "id": "^generated_exe::@[0-9a-f]+$",
+            "directorySource": "^.*/Tests/RunCMake/FileAPIExternalSource$",
+            "projectName": "External",
+            "type": "EXECUTABLE",
+            "isGeneratorProvided": None,
+            "sources": [
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPIExternalSource/empty\\.c$",
+                    "isGenerated": None,
+                    "sourceGroupName": "Source Files",
+                    "compileGroupLanguage": "C",
+                    "backtrace": [
+                        {
+                            "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                            "line": 5,
+                            "command": "add_executable",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild/generated\\.cxx$",
+                    "isGenerated": True,
+                    "sourceGroupName": "Generated Source Files",
+                    "compileGroupLanguage": "CXX",
+                    "backtrace": [
+                        {
+                            "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                            "line": 6,
+                            "command": "target_sources",
+                            "hasParent": True,
+                        },
+                        {
+                            "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                            "line": None,
+                            "command": None,
+                            "hasParent": False,
+                        },
+                    ],
+                },
+            ],
+            "sourceGroups": [
+                {
+                    "name": "Source Files",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPIExternalSource/empty\\.c$",
+                    ],
+                },
+                {
+                    "name": "Generated Source Files",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild/generated\\.cxx$",
+                    ],
+                },
+            ],
+            "compileGroups": [
+                {
+                    "language": "C",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPIExternalSource/empty\\.c$",
+                    ],
+                    "includes": [
+                        {
+                            "path": "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild$",
+                            "isSystem": None,
+                            "backtrace": None,
+                        },
+                        {
+                            "path": "^.*/Tests/RunCMake/FileAPIExternalSource$",
+                            "isSystem": True,
+                            "backtrace": [
+                                {
+                                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                                    "line": 11,
+                                    "command": "target_include_directories",
+                                    "hasParent": True,
+                                },
+                                {
+                                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                                    "line": None,
+                                    "command": None,
+                                    "hasParent": False,
+                                },
+                            ],
+                        },
+                    ],
+                    "defines": [
+                        {
+                            "define": "EMPTY_C=1",
+                            "backtrace": None,
+                        },
+                        {
+                            "define": "SRC_DUMMY",
+                            "backtrace": None,
+                        },
+                        {
+                            "define": "GENERATED_EXE=1",
+                            "backtrace": [
+                                {
+                                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                                    "line": 12,
+                                    "command": "target_compile_definitions",
+                                    "hasParent": True,
+                                },
+                                {
+                                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                                    "line": None,
+                                    "command": None,
+                                    "hasParent": False,
+                                },
+                            ],
+                        },
+                        {
+                            "define": "TGT_DUMMY",
+                            "backtrace": [
+                                {
+                                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                                    "line": 12,
+                                    "command": "target_compile_definitions",
+                                    "hasParent": True,
+                                },
+                                {
+                                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                                    "line": None,
+                                    "command": None,
+                                    "hasParent": False,
+                                },
+                            ],
+                        },
+                    ],
+                },
+                {
+                    "language": "CXX",
+                    "sourcePaths": [
+                        "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild/generated\\.cxx$",
+                    ],
+                    "includes": [
+                        {
+                            "path": "^.*/Tests/RunCMake/FileAPIExternalSource$",
+                            "isSystem": True,
+                            "backtrace": [
+                                {
+                                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                                    "line": 11,
+                                    "command": "target_include_directories",
+                                    "hasParent": True,
+                                },
+                                {
+                                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                                    "line": None,
+                                    "command": None,
+                                    "hasParent": False,
+                                },
+                            ],
+                        },
+                    ],
+                    "defines": [
+                        {
+                            "define": "GENERATED_EXE=1",
+                            "backtrace": [
+                                {
+                                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                                    "line": 12,
+                                    "command": "target_compile_definitions",
+                                    "hasParent": True,
+                                },
+                                {
+                                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                                    "line": None,
+                                    "command": None,
+                                    "hasParent": False,
+                                },
+                            ],
+                        },
+                        {
+                            "define": "TGT_DUMMY",
+                            "backtrace": [
+                                {
+                                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                                    "line": 12,
+                                    "command": "target_compile_definitions",
+                                    "hasParent": True,
+                                },
+                                {
+                                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                                    "line": None,
+                                    "command": None,
+                                    "hasParent": False,
+                                },
+                            ],
+                        },
+                    ],
+                },
+            ],
+            "backtrace": [
+                {
+                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                    "line": 5,
+                    "command": "add_executable",
+                    "hasParent": True,
+                },
+                {
+                    "file": "^.*/Tests/RunCMake/FileAPIExternalSource/CMakeLists\\.txt$",
+                    "line": None,
+                    "command": None,
+                    "hasParent": False,
+                },
+            ],
+            "folder": None,
+            "nameOnDisk": "^generated_exe(\\.exe)?$",
+            "artifacts": [
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?generated_exe(\\.exe)?$",
+                    "_dllExtra": False,
+                },
+                {
+                    "path": "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild/((Debug|Release|RelWithDebInfo|MinSizeRel)/)?generated_exe\\.pdb$",
+                    "_dllExtra": True,
+                },
+            ],
+            "build": "^.*/Tests/RunCMake/FileAPI/FileAPIExternalBuild$",
+            "source": "^.*/Tests/RunCMake/FileAPIExternalSource$",
+            "install": None,
+            "link": {
+                "language": "CXX",
+                "lto": None,
+            },
+            "archive": None,
+            "dependencies": [
+                {
+                    "id": "^ZERO_CHECK::@[0-9a-f]+$",
+                    "backtrace": None,
+                },
+            ],
+        },
+    ]
+
+    if not os.path.exists(os.path.join(reply_dir, "..", "..", "..", "..", "ipo_enabled.txt")):
+        for e in expected:
+            try:
+                e["link"]["lto"] = None
+            except TypeError:  # "link" is not a dict, no problem.
+                pass
+            try:
+                e["archive"]["lto"] = None
+            except TypeError:  # "archive" is not a dict, no problem.
+                pass
+
+    if inSource:
+        for e in expected:
+            if e["sources"] is not None:
+                for s in e["sources"]:
+                    s["path"] = s["path"].replace("^.*/Tests/RunCMake/FileAPI/", "^", 1)
+            if e["sourceGroups"] is not None:
+                for g in e["sourceGroups"]:
+                    g["sourcePaths"] = [p.replace("^.*/Tests/RunCMake/FileAPI/", "^", 1) for p in g["sourcePaths"]]
+            if e["compileGroups"] is not None:
+                for g in e["compileGroups"]:
+                    g["sourcePaths"] = [p.replace("^.*/Tests/RunCMake/FileAPI/", "^", 1) for p in g["sourcePaths"]]
+
+    if matches(g, "^Visual Studio "):
+        expected = filter_list(lambda e: e["name"] not in ("ZERO_CHECK") or e["id"] == "^ZERO_CHECK::@6890427a1f51a3e7e1df$", expected)
+        for e in expected:
+            if e["type"] == "UTILITY":
+                if e["id"] == "^ZERO_CHECK::@6890427a1f51a3e7e1df$":
+                    e["sources"] = [
+                        {
+                            "path": "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/CMakeFiles/([0-9a-f]+/)?generate\\.stamp\\.rule$",
+                            "isGenerated": True,
+                            "sourceGroupName": "CMake Rules",
+                            "compileGroupLanguage": None,
+                            "backtrace": [
+                                {
+                                    "file": "^CMakeLists\\.txt$",
+                                    "line": None,
+                                    "command": None,
+                                    "hasParent": False,
+                                },
+                            ],
+                        },
+                    ]
+                    e["sourceGroups"] = [
+                        {
+                            "name": "CMake Rules",
+                            "sourcePaths": [
+                                "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build/CMakeFiles/([0-9a-f]+/)?generate\\.stamp\\.rule$",
+                            ],
+                        },
+                    ]
+                elif e["name"] in ("ALL_BUILD"):
+                    e["sources"] = []
+                    e["sourceGroups"] = None
+            if e["dependencies"] is not None:
+                for d in e["dependencies"]:
+                    if matches(d["id"], "^\\^ZERO_CHECK::@"):
+                        d["id"] = "^ZERO_CHECK::@6890427a1f51a3e7e1df$"
+
+    elif g == "Xcode":
+        if ';' in os.environ.get("CMAKE_OSX_ARCHITECTURES", ""):
+            expected = filter_list(lambda e: e["name"] not in ("link_imported_object_exe"), expected)
+            for e in expected:
+                e["dependencies"] = filter_list(lambda d: not matches(d["id"], "^\\^link_imported_object_exe::@"), e["dependencies"])
+                if e["name"] in ("c_object_lib", "cxx_object_lib"):
+                    e["artifacts"] = None
+
+    else:
+        for e in expected:
+            e["dependencies"] = filter_list(lambda d: not matches(d["id"], "^\\^ZERO_CHECK::@"), e["dependencies"])
+
+        expected = filter_list(lambda t: t["name"] not in ("ALL_BUILD", "ZERO_CHECK"), expected)
+
+    if sys.platform not in ("win32", "cygwin", "msys"):
+        for e in expected:
+            e["artifacts"] = filter_list(lambda a: not a["_dllExtra"], e["artifacts"])
+
+    return expected
+
+def check_targets(c, g, inSource):
+    check_list_match(lambda a, e: matches(a["id"], e["id"]),
+                     c["targets"], gen_check_targets(c, g, inSource),
+                     check=check_target(c),
+                     check_exception=lambda a, e: "Target ID: %s" % a["id"],
+                     missing_exception=lambda e: "Target ID: %s" % e["id"],
+                     extra_exception=lambda a: "Target ID: %s" % a["id"])
+
+def gen_check_projects(c, g):
+    expected = [
+        {
+            "name": "codemodel-v2",
+            "parentName": None,
+            "childNames": [
+                "Alias",
+                "Custom",
+                "Cxx",
+                "Imported",
+                "Object",
+                "External",
+            ],
+            "directorySources": [
+                "^\\.$",
+                "^dir$",
+                "^dir/dir$",
+            ],
+            "targetIds": [
+                "^ALL_BUILD::@6890427a1f51a3e7e1df$",
+                "^ZERO_CHECK::@6890427a1f51a3e7e1df$",
+                "^interface_exe::@6890427a1f51a3e7e1df$",
+                "^c_lib::@6890427a1f51a3e7e1df$",
+                "^c_exe::@6890427a1f51a3e7e1df$",
+                "^c_shared_lib::@6890427a1f51a3e7e1df$",
+                "^c_shared_exe::@6890427a1f51a3e7e1df$",
+                "^c_static_lib::@6890427a1f51a3e7e1df$",
+                "^c_static_exe::@6890427a1f51a3e7e1df$",
+            ],
+        },
+        {
+            "name": "Cxx",
+            "parentName": "codemodel-v2",
+            "childNames": None,
+            "directorySources": [
+                "^cxx$",
+            ],
+            "targetIds": [
+                "^ALL_BUILD::@a56b12a3f5c0529fb296$",
+                "^ZERO_CHECK::@a56b12a3f5c0529fb296$",
+                "^cxx_lib::@a56b12a3f5c0529fb296$",
+                "^cxx_exe::@a56b12a3f5c0529fb296$",
+                "^cxx_shared_lib::@a56b12a3f5c0529fb296$",
+                "^cxx_shared_exe::@a56b12a3f5c0529fb296$",
+                "^cxx_static_lib::@a56b12a3f5c0529fb296$",
+                "^cxx_static_exe::@a56b12a3f5c0529fb296$",
+            ],
+        },
+        {
+            "name": "Alias",
+            "parentName": "codemodel-v2",
+            "childNames": None,
+            "directorySources": [
+                "^alias$",
+            ],
+            "targetIds": [
+                "^ALL_BUILD::@53632cba2752272bb008$",
+                "^ZERO_CHECK::@53632cba2752272bb008$",
+                "^c_alias_exe::@53632cba2752272bb008$",
+                "^cxx_alias_exe::@53632cba2752272bb008$",
+            ],
+        },
+        {
+            "name": "Object",
+            "parentName": "codemodel-v2",
+            "childNames": None,
+            "directorySources": [
+                "^object$",
+            ],
+            "targetIds": [
+                "^ALL_BUILD::@5ed5358f70faf8d8af7a$",
+                "^ZERO_CHECK::@5ed5358f70faf8d8af7a$",
+                "^c_object_lib::@5ed5358f70faf8d8af7a$",
+                "^c_object_exe::@5ed5358f70faf8d8af7a$",
+                "^cxx_object_lib::@5ed5358f70faf8d8af7a$",
+                "^cxx_object_exe::@5ed5358f70faf8d8af7a$",
+            ],
+        },
+        {
+            "name": "Imported",
+            "parentName": "codemodel-v2",
+            "childNames": None,
+            "directorySources": [
+                "^imported$",
+            ],
+            "targetIds": [
+                "^ALL_BUILD::@ba7eb709d0b48779c6c8$",
+                "^ZERO_CHECK::@ba7eb709d0b48779c6c8$",
+                "^link_imported_exe::@ba7eb709d0b48779c6c8$",
+                "^link_imported_shared_exe::@ba7eb709d0b48779c6c8$",
+                "^link_imported_static_exe::@ba7eb709d0b48779c6c8$",
+                "^link_imported_object_exe::@ba7eb709d0b48779c6c8$",
+                "^link_imported_interface_exe::@ba7eb709d0b48779c6c8$",
+            ],
+        },
+        {
+            "name": "Custom",
+            "parentName": "codemodel-v2",
+            "childNames": None,
+            "directorySources": [
+                "^custom$",
+            ],
+            "targetIds": [
+                "^ALL_BUILD::@c11385ffed57b860da63$",
+                "^ZERO_CHECK::@c11385ffed57b860da63$",
+                "^custom_tgt::@c11385ffed57b860da63$",
+                "^custom_exe::@c11385ffed57b860da63$",
+            ],
+        },
+        {
+            "name": "External",
+            "parentName": "codemodel-v2",
+            "childNames": None,
+            "directorySources": [
+                "^.*/Tests/RunCMake/FileAPIExternalSource$",
+            ],
+            "targetIds": [
+                "^ALL_BUILD::@[0-9a-f]+$",
+                "^ZERO_CHECK::@[0-9a-f]+$",
+                "^generated_exe::@[0-9a-f]+$",
+            ],
+        },
+    ]
+
+    if matches(g, "^Visual Studio "):
+        for e in expected:
+            if e["parentName"] is not None:
+                e["targetIds"] = filter_list(lambda t: not matches(t, "^\\^ZERO_CHECK"), e["targetIds"])
+
+    elif g == "Xcode":
+        if ';' in os.environ.get("CMAKE_OSX_ARCHITECTURES", ""):
+            for e in expected:
+                e["targetIds"] = filter_list(lambda t: not matches(t, "^\\^(link_imported_object_exe)"), e["targetIds"])
+
+    else:
+        for e in expected:
+            e["targetIds"] = filter_list(lambda t: not matches(t, "^\\^(ALL_BUILD|ZERO_CHECK)"), e["targetIds"])
+
+    return expected
+
+def check_projects(c, g):
+    check_list_match(lambda a, e: is_string(a["name"], e["name"]), c["projects"], gen_check_projects(c, g),
+                     check=check_project(c),
+                     check_exception=lambda a, e: "Project name: %s" % a["name"],
+                     missing_exception=lambda e: "Project name: %s" % e["name"],
+                     extra_exception=lambda a: "Project name: %s" % a["name"])
+
+def check_object_codemodel_configuration(c, g, inSource):
+    assert sorted(c.keys()) == ["directories", "name", "projects", "targets"]
+    assert is_string(c["name"])
+    check_directories(c, g)
+    check_targets(c, g, inSource)
+    check_projects(c, g)
+
+def check_object_codemodel(g):
+    def _check(o):
+        assert sorted(o.keys()) == ["configurations", "kind", "paths", "version"]
+        # The "kind" and "version" members are handled by check_index_object.
+        assert is_dict(o["paths"])
+        assert sorted(o["paths"].keys()) == ["build", "source"]
+        assert matches(o["paths"]["build"], "^.*/Tests/RunCMake/FileAPI/codemodel-v2-build$")
+        assert matches(o["paths"]["source"], "^.*/Tests/RunCMake/FileAPI$")
+
+        inSource = os.path.dirname(o["paths"]["build"]) == o["paths"]["source"]
+
+        if matches(g, "^(Visual Studio |Xcode$)"):
+            assert sorted([c["name"] for c in o["configurations"]]) == ["Debug", "MinSizeRel", "RelWithDebInfo", "Release"]
+        else:
+            assert len(o["configurations"]) == 1
+            assert o["configurations"][0]["name"] in ("", "Debug", "Release", "RelWithDebInfo", "MinSizeRel")
+
+        for c in o["configurations"]:
+            check_object_codemodel_configuration(c, g, inSource)
+    return _check
+
+assert is_dict(index)
+assert sorted(index.keys()) == ["cmake", "objects", "reply"]
+check_objects(index["objects"], index["cmake"]["generator"]["name"])
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2.cmake b/Tests/RunCMake/FileAPI/codemodel-v2.cmake
new file mode 100644
index 0000000..72073d5
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/codemodel-v2.cmake
@@ -0,0 +1,35 @@
+enable_language(C)
+
+include("${CMAKE_CURRENT_LIST_DIR}/include_test.cmake")
+
+add_library(c_lib empty.c)
+add_executable(c_exe empty.c)
+target_link_libraries(c_exe PRIVATE c_lib)
+
+add_library(c_shared_lib SHARED empty.c)
+add_executable(c_shared_exe empty.c)
+target_link_libraries(c_shared_exe PRIVATE c_shared_lib)
+
+add_library(c_static_lib STATIC empty.c)
+add_executable(c_static_exe empty.c)
+target_link_libraries(c_static_exe PRIVATE c_static_lib)
+
+add_subdirectory(cxx)
+add_subdirectory(alias)
+add_subdirectory(object)
+add_subdirectory(imported)
+add_subdirectory(custom)
+add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/../FileAPIExternalSource" "${CMAKE_CURRENT_BINARY_DIR}/../FileAPIExternalBuild")
+add_subdirectory(dir)
+
+set_property(TARGET c_shared_lib PROPERTY LIBRARY_OUTPUT_DIRECTORY lib)
+set_property(TARGET c_shared_lib PROPERTY RUNTIME_OUTPUT_DIRECTORY lib)
+
+include(CheckIPOSupported)
+check_ipo_supported(RESULT _ipo LANGUAGES C)
+if(_ipo)
+  set_property(TARGET c_shared_lib PROPERTY INTERPROCEDURAL_OPTIMIZATION ON)
+  set_property(TARGET c_shared_exe PROPERTY INTERPROCEDURAL_OPTIMIZATION ON)
+  set_property(TARGET c_static_lib PROPERTY INTERPROCEDURAL_OPTIMIZATION ON)
+  file(WRITE "${CMAKE_BINARY_DIR}/ipo_enabled.txt" "")
+endif()
diff --git a/Tests/RunCMake/FileAPI/custom/CMakeLists.txt b/Tests/RunCMake/FileAPI/custom/CMakeLists.txt
new file mode 100644
index 0000000..1cdf5c2
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/custom/CMakeLists.txt
@@ -0,0 +1,5 @@
+project(Custom)
+
+add_custom_target(custom_tgt COMMAND ${CMAKE_COMMAND} -E echo "Building custom_tgt")
+add_executable(custom_exe ../empty.c)
+add_dependencies(custom_exe custom_tgt)
diff --git a/Tests/RunCMake/FileAPI/cxx/CMakeLists.txt b/Tests/RunCMake/FileAPI/cxx/CMakeLists.txt
new file mode 100644
index 0000000..29b61b8
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/cxx/CMakeLists.txt
@@ -0,0 +1,15 @@
+project(Cxx)
+enable_language(CXX)
+
+add_library(cxx_lib ../empty.cxx)
+add_executable(cxx_exe ../empty.cxx)
+target_link_libraries(cxx_exe PRIVATE cxx_lib)
+set_property(TARGET cxx_exe PROPERTY FOLDER bin)
+
+add_library(cxx_shared_lib SHARED ../empty.cxx)
+add_executable(cxx_shared_exe ../empty.cxx)
+target_link_libraries(cxx_shared_exe PRIVATE cxx_shared_lib)
+
+add_library(cxx_static_lib STATIC ../empty.cxx)
+add_executable(cxx_static_exe ../empty.cxx)
+target_link_libraries(cxx_static_exe PRIVATE cxx_static_lib)
diff --git a/Tests/RunCMake/FileAPI/dir/CMakeLists.txt b/Tests/RunCMake/FileAPI/dir/CMakeLists.txt
new file mode 100644
index 0000000..780445d
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/dir/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(dir)
diff --git a/Tests/RunCMake/FileAPI/dir/dir/CMakeLists.txt b/Tests/RunCMake/FileAPI/dir/dir/CMakeLists.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/dir/dir/CMakeLists.txt
diff --git a/Tests/RunCMake/FileAPI/dir/dirtest.cmake b/Tests/RunCMake/FileAPI/dir/dirtest.cmake
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/dir/dirtest.cmake
diff --git a/Tests/RunCMake/FileAPI/empty.c b/Tests/RunCMake/FileAPI/empty.c
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/empty.c
diff --git a/Tests/RunCMake/FileAPI/empty.cxx b/Tests/RunCMake/FileAPI/empty.cxx
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/empty.cxx
diff --git a/Tests/RunCMake/FileAPI/imported/CMakeLists.txt b/Tests/RunCMake/FileAPI/imported/CMakeLists.txt
new file mode 100644
index 0000000..d36d88b
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/imported/CMakeLists.txt
@@ -0,0 +1,24 @@
+project(Imported)
+
+add_library(imported_lib UNKNOWN IMPORTED)
+add_executable(imported_exe IMPORTED)
+add_executable(link_imported_exe ../empty.c)
+target_link_libraries(link_imported_exe PRIVATE imported_lib)
+
+add_library(imported_shared_lib SHARED IMPORTED)
+add_executable(link_imported_shared_exe ../empty.c)
+target_link_libraries(link_imported_shared_exe PRIVATE imported_shared_lib)
+
+add_library(imported_static_lib STATIC IMPORTED)
+add_executable(link_imported_static_exe ../empty.c)
+target_link_libraries(link_imported_static_exe PRIVATE imported_static_lib)
+
+if(NOT CMAKE_GENERATOR STREQUAL "Xcode" OR NOT CMAKE_OSX_ARCHITECTURES MATCHES "[;$]")
+  add_library(imported_object_lib OBJECT IMPORTED)
+  add_executable(link_imported_object_exe ../empty.c)
+  target_link_libraries(link_imported_object_exe PRIVATE imported_object_lib)
+endif()
+
+add_library(imported_interface_lib INTERFACE IMPORTED)
+add_executable(link_imported_interface_exe ../empty.c)
+target_link_libraries(link_imported_interface_exe PRIVATE imported_interface_lib)
diff --git a/Tests/RunCMake/FileAPI/include_test.cmake b/Tests/RunCMake/FileAPI/include_test.cmake
new file mode 100644
index 0000000..c74d264
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/include_test.cmake
@@ -0,0 +1,9 @@
+add_library(interface_lib INTERFACE)
+target_compile_definitions(interface_lib INTERFACE COMPILED_WITH_INTERFACE_LIB)
+add_executable(interface_exe empty.c)
+target_link_libraries(interface_exe PRIVATE inteface_lib)
+set_property(TARGET interface_exe PROPERTY ENABLE_EXPORTS ON)
+set_property(TARGET interface_exe PROPERTY RUNTIME_OUTPUT_DIRECTORY bin)
+set_property(TARGET interface_exe PROPERTY ARCHIVE_OUTPUT_DIRECTORY lib)
+set_property(TARGET interface_exe PROPERTY OUTPUT_NAME my_interface_exe)
+set_property(TARGET interface_exe PROPERTY SUFFIX .myexe)
diff --git a/Tests/RunCMake/FileAPI/object/CMakeLists.txt b/Tests/RunCMake/FileAPI/object/CMakeLists.txt
new file mode 100644
index 0000000..9773b81
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/object/CMakeLists.txt
@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.13)
+project(Object)
+enable_language(CXX)
+
+add_library(c_object_lib OBJECT ../empty.c)
+add_executable(c_object_exe ../empty.c)
+target_link_libraries(c_object_exe PRIVATE c_object_lib)
+
+add_library(cxx_object_lib OBJECT ../empty.cxx)
+add_executable(cxx_object_exe ../empty.cxx)
+target_link_libraries(cxx_object_exe PRIVATE cxx_object_lib)
+
+install(TARGETS c_object_exe cxx_object_exe DESTINATION bin)
diff --git a/Tests/RunCMake/FileAPIDummyFile.cmake b/Tests/RunCMake/FileAPIDummyFile.cmake
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPIDummyFile.cmake
diff --git a/Tests/RunCMake/FileAPIExternalSource/CMakeLists.txt b/Tests/RunCMake/FileAPIExternalSource/CMakeLists.txt
new file mode 100644
index 0000000..f5670a7
--- /dev/null
+++ b/Tests/RunCMake/FileAPIExternalSource/CMakeLists.txt
@@ -0,0 +1,12 @@
+project(External)
+enable_language(CXX)
+
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/generated.cxx" "")
+add_executable(generated_exe empty.c)
+target_sources(generated_exe PRIVATE "${CMAKE_CURRENT_BINARY_DIR}/generated.cxx")
+source_group("Generated Source Files" FILES "${CMAKE_CURRENT_BINARY_DIR}/generated.cxx")
+set_property(SOURCE "${CMAKE_CURRENT_BINARY_DIR}/generated.cxx" PROPERTY GENERATED ON)
+set_property(SOURCE empty.c PROPERTY COMPILE_DEFINITIONS EMPTY_C=1 SRC_DUMMY)
+set_property(SOURCE empty.c PROPERTY INCLUDE_DIRECTORIES "${CMAKE_CURRENT_BINARY_DIR}")
+target_include_directories(generated_exe SYSTEM PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}")
+target_compile_definitions(generated_exe PRIVATE GENERATED_EXE=1 -DTGT_DUMMY)
diff --git a/Tests/RunCMake/FileAPIExternalSource/empty.c b/Tests/RunCMake/FileAPIExternalSource/empty.c
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPIExternalSource/empty.c
diff --git a/Tests/RunCMake/RunCMake.cmake b/Tests/RunCMake/RunCMake.cmake
index c076ad9..4bacd96 100644
--- a/Tests/RunCMake/RunCMake.cmake
+++ b/Tests/RunCMake/RunCMake.cmake
@@ -45,6 +45,11 @@
     file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
   endif()
   file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}")
+  if(RunCMake-prep-file AND EXISTS ${top_src}/${RunCMake-prep-file})
+    include(${top_src}/${RunCMake-prep-file})
+  else()
+    include(${top_src}/${test}-prep.cmake OPTIONAL)
+  endif()
   if(NOT DEFINED RunCMake_TEST_OPTIONS)
     set(RunCMake_TEST_OPTIONS "")
   endif()
diff --git a/Utilities/IWYU/mapping.imp b/Utilities/IWYU/mapping.imp
index a68d767..c5231bb 100644
--- a/Utilities/IWYU/mapping.imp
+++ b/Utilities/IWYU/mapping.imp
@@ -123,6 +123,8 @@
   { symbol: [ "SIGINT", private, "\"cm_uv.h\"", public ] },
   { symbol: [ "ssize_t", private, "\"cm_uv.h\"", public ] },
 
+  { symbol: [ "Json::ArrayIndex", private, "\"cm_jsoncpp_value.h\"", public ] },
+
   { symbol: [ "std::ifstream", private, "\"cmsys/FStream.hxx\"", public ] },
   { symbol: [ "std::ofstream", private, "\"cmsys/FStream.hxx\"", public ] },
   { symbol: [ "cmsys::ifstream", private, "\"cmsys/FStream.hxx\"", public ] },
diff --git a/Utilities/cmjsoncpp/src/lib_json/json_reader.cpp b/Utilities/cmjsoncpp/src/lib_json/json_reader.cpp
index 0249cc9..6eeba0e 100644
--- a/Utilities/cmjsoncpp/src/lib_json/json_reader.cpp
+++ b/Utilities/cmjsoncpp/src/lib_json/json_reader.cpp
@@ -1581,7 +1581,7 @@
     ++current;
   // TODO: Help the compiler do the div and mod at compile time or get rid of them.
   Value::LargestUInt maxIntegerValue =
-      isNegative ? Value::LargestUInt(-Value::minLargestInt)
+      isNegative ? Value::LargestUInt(Value::minLargestInt)
                  : Value::maxLargestUInt;
   Value::LargestUInt threshold = maxIntegerValue / 10;
   Value::LargestUInt value = 0;
diff --git a/bootstrap b/bootstrap
index 6710d1a..dcc3a83 100755
--- a/bootstrap
+++ b/bootstrap
@@ -430,6 +430,7 @@
   cmake  \
   cmakemain \
   cmcmd  \
+  cm_string_view \
 "
 
 if ${cmake_system_mingw}; then