Modules/FeatureSummary.cmake

# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
FeatureSummary
--------------

Functions for generating a summary of enabled/disabled features.

These functions can be used to generate a summary of enabled and disabled
packages and/or feature for a build tree such as::

    -- The following OPTIONAL packages have been found:
    LibXml2 (required version >= 2.4), XML processing lib, <http://xmlsoft.org>
       * Enables HTML-import in MyWordProcessor
       * Enables odt-export in MyWordProcessor
    PNG, A PNG image library., <http://www.libpng.org/pub/png/>
       * Enables saving screenshots
    -- The following OPTIONAL packages have not been found:
    Lua51, The Lua scripting language., <http://www.lua.org>
       * Enables macros in MyWordProcessor
    Foo, Foo provides cool stuff.

Global Properties
^^^^^^^^^^^^^^^^^

.. variable:: FeatureSummary_PKG_TYPES

The global property :variable:`FeatureSummary_PKG_TYPES` defines the type of
packages used by `FeatureSummary`.

The order in this list is important, the first package type in the list is the
least important, the last is the most important. the of a package can only be
changed to higher types.

The default package types are , ``RUNTIME``, ``OPTIONAL``, ``RECOMMENDED`` and
``REQUIRED``, and their importance is
``RUNTIME < OPTIONAL < RECOMMENDED < REQUIRED``.


.. variable:: FeatureSummary_REQUIRED_PKG_TYPES

The global property :variable:`FeatureSummary_REQUIRED_PKG_TYPES` defines which
package types are required.

If one or more package in this categories has not been found, CMake will abort
when calling :command:`feature_summary` with the
'FATAL_ON_MISSING_REQUIRED_PACKAGES' option enabled.

The default value for this global property is ``REQUIRED``.


.. variable:: FeatureSummary_DEFAULT_PKG_TYPE

The global property :variable:`FeatureSummary_DEFAULT_PKG_TYPE` defines which
package type is the default one.
When calling :command:`feature_summary`, if the user did not set the package type
explicitly, the package will be assigned to this category.

This value must be one of the types defined in the
:variable:`FeatureSummary_PKG_TYPES` global property unless the package type
is set for all the packages.

The default value for this global property is ``OPTIONAL``.


.. variable:: FeatureSummary_<TYPE>_DESCRIPTION

The global property :variable:`FeatureSummary_<TYPE>_DESCRIPTION` can be defined
for each type to replace the type name with the specified string whenever the
package type is used in an output string.

If not set, the string "``<TYPE>`` packages" is used.


#]=======================================================================]

get_property(_fsPkgTypeIsSet GLOBAL PROPERTY FeatureSummary_PKG_TYPES SET)
if(NOT _fsPkgTypeIsSet)
  set_property(GLOBAL PROPERTY FeatureSummary_PKG_TYPES RUNTIME OPTIONAL RECOMMENDED REQUIRED)
endif()

get_property(_fsReqPkgTypesIsSet GLOBAL PROPERTY FeatureSummary_REQUIRED_PKG_TYPES SET)
if(NOT _fsReqPkgTypesIsSet)
  set_property(GLOBAL PROPERTY FeatureSummary_REQUIRED_PKG_TYPES REQUIRED)
endif()

get_property(_fsDefaultPkgTypeIsSet GLOBAL PROPERTY FeatureSummary_DEFAULT_PKG_TYPE SET)
if(NOT _fsDefaultPkgTypeIsSet)
  set_property(GLOBAL PROPERTY FeatureSummary_DEFAULT_PKG_TYPE OPTIONAL)
endif()

#[=======================================================================[.rst:

Functions
^^^^^^^^^

#]=======================================================================]

include(CMakeParseArguments)

function(_FS_GET_FEATURE_SUMMARY _property _var _includeQuiet)

  get_property(_fsPkgTypes GLOBAL PROPERTY FeatureSummary_PKG_TYPES)
  get_property(_fsDefaultPkgType GLOBAL PROPERTY FeatureSummary_DEFAULT_PKG_TYPE)

  set(_type "ANY")
  foreach(_fsPkgType ${_fsPkgTypes})
    if("${_property}" MATCHES "${_fsPkgType}_PACKAGES_(NOT_)?FOUND")
      set(_type "${_fsPkgType}")
      break()
    endif()
  endforeach()

  if("${_property}" MATCHES "PACKAGES_FOUND")
    set(_property "PACKAGES_FOUND")
  elseif("${_property}" MATCHES "PACKAGES_NOT_FOUND")
    set(_property "PACKAGES_NOT_FOUND")
  endif()


  set(_currentFeatureText "")
  get_property(_EnabledFeatures  GLOBAL PROPERTY ${_property})
  if(_EnabledFeatures)
    list(REMOVE_DUPLICATES _EnabledFeatures)
  endif(_EnabledFeatures)

  foreach(_currentFeature ${_EnabledFeatures})

    # does this package belong to the type we currently want to list ?
    get_property(_currentType  GLOBAL PROPERTY _CMAKE_${_currentFeature}_TYPE)
    if(NOT _currentType)
      list(FIND _fsPkgTypes "${_fsDefaultPkgType}" _defaultInPkgTypes)
      if("${_defaultInPkgTypes}" STREQUAL "-1")
        string(REGEX REPLACE ";([^;]+)$" " and \\1" _fsPkgTypes_msg "${_fsPkgTypes}")
        string(REPLACE ";" ", " _fsPkgTypes_msg "${_fsPkgTypes_msg}")
        message(FATAL_ERROR "Bad package property type ${_fsDefaultPkgType} used in global property FeatureSummary_DEFAULT_PKG_TYPE. "
                            "Valid types are ${_fsPkgTypes_msg}. "
                            "Either update FeatureSummary_DEFAULT_PKG_TYPE or add ${_fsDefaultPkgType} to the FeatureSummary_PKG_TYPES global property.")
      endif()
      set(_currentType ${_fsDefaultPkgType})
    endif()

    if("${_type}" STREQUAL ANY  OR  "${_type}" STREQUAL "${_currentType}")
      # check whether the current feature/package should be in the output depending on whether it was QUIET or not
      set(includeThisOne TRUE)
      set(_required FALSE)
      # skip QUIET packages, except if they are REQUIRED or INCLUDE_QUIET_PACKAGES has been set
      get_property(_fsReqPkgTypes GLOBAL PROPERTY FeatureSummary_REQUIRED_PKG_TYPES)
      foreach(_fsReqPkgType ${_fsReqPkgTypes})
        if("${_currentType}" STREQUAL "${_fsReqPkgType}")
          set(_required TRUE)
          break()
        endif()
      endforeach()
      if(NOT _required AND NOT _includeQuiet)
        get_property(_isQuiet  GLOBAL PROPERTY _CMAKE_${_currentFeature}_QUIET)
        if(_isQuiet)
          set(includeThisOne FALSE)
        endif()
      endif()
      get_property(_isTransitiveDepend
        GLOBAL PROPERTY _CMAKE_${_currentFeature}_TRANSITIVE_DEPENDENCY
      )
      if(_isTransitiveDepend)
        set(includeThisOne FALSE)
      endif()

      if(includeThisOne)

        string(APPEND _currentFeatureText "\n * ${_currentFeature}")
        get_property(_info  GLOBAL PROPERTY _CMAKE_${_currentFeature}_REQUIRED_VERSION)
        if(_info)
          string(APPEND _currentFeatureText " (required version ${_info})")
        endif()
        get_property(_info  GLOBAL PROPERTY _CMAKE_${_currentFeature}_DESCRIPTION)
        if(_info)
          string(APPEND _currentFeatureText ", ${_info}")
        endif()
        get_property(_info  GLOBAL PROPERTY _CMAKE_${_currentFeature}_URL)
        if(_info)
          string(APPEND _currentFeatureText ", <${_info}>")
        endif()

        get_property(_info  GLOBAL PROPERTY _CMAKE_${_currentFeature}_PURPOSE)
        foreach(_purpose ${_info})
          string(APPEND _currentFeatureText "\n   ${_purpose}")
        endforeach()

      endif()

    endif()

  endforeach()
  set(${_var} "${_currentFeatureText}" PARENT_SCOPE)
endfunction()


#[=======================================================================[.rst:
.. command:: feature_summary

  ::

    feature_summary( [FILENAME <file>]
                     [APPEND]
                     [VAR <variable_name>]
                     [INCLUDE_QUIET_PACKAGES]
                     [FATAL_ON_MISSING_REQUIRED_PACKAGES]
                     [DESCRIPTION "<description>" | DEFAULT_DESCRIPTION]
                     [QUIET_ON_EMPTY]
                     WHAT (ALL
                          | PACKAGES_FOUND | PACKAGES_NOT_FOUND
                          | <TYPE>_PACKAGES_FOUND | <TYPE>_PACKAGES_NOT_FOUND
                          | ENABLED_FEATURES | DISABLED_FEATURES)
                   )

  The ``feature_summary()`` macro can be used to print information about
  enabled or disabled packages or features of a project.  By default,
  only the names of the features/packages will be printed and their
  required version when one was specified.  Use ``set_package_properties()``
  to add more useful information, like e.g.  a download URL for the
  respective package or their purpose in the project.

  The ``WHAT`` option is the only mandatory option.  Here you specify what
  information will be printed:

  ``ALL``
   print everything
  ``ENABLED_FEATURES``
   the list of all features which are enabled
  ``DISABLED_FEATURES``
   the list of all features which are disabled
  ``PACKAGES_FOUND``
   the list of all packages which have been found
  ``PACKAGES_NOT_FOUND``
   the list of all packages which have not been found

  For each package type ``<TYPE>`` defined by the
  :variable:`FeatureSummary_PKG_TYPES` global property, the following
  information can also be used:

  ``<TYPE>_PACKAGES_FOUND``
   only those packages which have been found which have the type <TYPE>
  ``<TYPE>_PACKAGES_NOT_FOUND``
   only those packages which have not been found which have the type <TYPE>

  With the exception of the ``ALL`` value, these values can be combined
  in order to customize the output. For example:

  .. code-block:: cmake

    feature_summary(WHAT ENABLED_FEATURES DISABLED_FEATURES)

  If a ``FILENAME`` is given, the information is printed into this file.  If
  ``APPEND`` is used, it is appended to this file, otherwise the file is
  overwritten if it already existed.  If the VAR option is used, the
  information is "printed" into the specified variable.  If ``FILENAME`` is
  not used, the information is printed to the terminal.  Using the
  ``DESCRIPTION`` option a description or headline can be set which will be
  printed above the actual content.  If only one type of
  package was requested, no title is printed, unless it is explicitly set using
  either ``DESCRIPTION`` to use a custom string, or ``DEFAULT_DESCRIPTION`` to
  use a default title for the requested type.
  If ``INCLUDE_QUIET_PACKAGES`` is given, packages which have been searched with
  ``find_package(... QUIET)`` will also be listed. By default they are skipped.
  If ``FATAL_ON_MISSING_REQUIRED_PACKAGES`` is given, CMake will abort if a
  package which is marked as one of the package types listed in the
  :variable:`FeatureSummary_REQUIRED_PKG_TYPES` global property has not been
  found.
  The default value for the :variable:`FeatureSummary_REQUIRED_PKG_TYPES` global
  property is ``REQUIRED``.

  The :variable:`FeatureSummary_DEFAULT_PKG_TYPE` global property can be
  modified to change the default package type assigned when not explicitly
  assigned by the user.

  If the ``QUIET_ON_EMPTY`` option is used, if only one type of package was
  requested, and no packages belonging to that category were found, then no
  output (including the ``DESCRIPTION``) is printed or added to the ``VAR``
  variable.

  Example 1, append everything to a file:

  .. code-block:: cmake

   include(FeatureSummary)
   feature_summary(WHAT ALL
                   FILENAME ${CMAKE_BINARY_DIR}/all.log APPEND)

  Example 2, print the enabled features into the variable
  enabledFeaturesText, including QUIET packages:

  .. code-block:: cmake

   include(FeatureSummary)
   feature_summary(WHAT ENABLED_FEATURES
                   INCLUDE_QUIET_PACKAGES
                   DESCRIPTION "Enabled Features:"
                   VAR enabledFeaturesText)
   message(STATUS "${enabledFeaturesText}")

  Example 3, change default package types and print only the categories that
  are not empty:

  .. code-block:: cmake

   include(FeatureSummary)
   set_property(GLOBAL APPEND PROPERTY FeatureSummary_PKG_TYPES BUILD)
   find_package(FOO)
   set_package_properties(FOO PROPERTIES TYPE BUILD)
   feature_summary(WHAT BUILD_PACKAGES_FOUND
                   Description "Build tools found:"
                   QUIET_ON_EMPTY)
   feature_summary(WHAT BUILD_PACKAGES_NOT_FOUND
                   Description "Build tools not found:"
                   QUIET_ON_EMPTY)

#]=======================================================================]

function(FEATURE_SUMMARY)
# CMAKE_PARSE_ARGUMENTS(<prefix> <options> <one_value_keywords> <multi_value_keywords> args...)
  set(options APPEND
              INCLUDE_QUIET_PACKAGES
              FATAL_ON_MISSING_REQUIRED_PACKAGES
              QUIET_ON_EMPTY
              DEFAULT_DESCRIPTION)
  set(oneValueArgs FILENAME
                   VAR
                   DESCRIPTION)
  set(multiValueArgs WHAT)

  CMAKE_PARSE_ARGUMENTS(_FS "${options}" "${oneValueArgs}" "${multiValueArgs}"  ${_FIRST_ARG} ${ARGN})

  if(_FS_UNPARSED_ARGUMENTS)
    message(FATAL_ERROR "Unknown keywords given to FEATURE_SUMMARY(): \"${_FS_UNPARSED_ARGUMENTS}\"")
  endif()

  if(NOT _FS_WHAT)
    message(FATAL_ERROR "The call to FEATURE_SUMMARY() doesn't set the required WHAT argument.")
  endif()

  if(_FS_DEFAULT_DESCRIPTION AND DEFINED _FS_DESCRIPTION)
    message(WARNING "DEFAULT_DESCRIPTION option discarded since DESCRIPTION is set.")
    set(_FS_DEFAULT_DESCRIPTION 0)
  endif()

  set(validWhatParts "ENABLED_FEATURES"
                     "DISABLED_FEATURES"
                     "PACKAGES_FOUND"
                     "PACKAGES_NOT_FOUND")

  get_property(_fsPkgTypes GLOBAL PROPERTY FeatureSummary_PKG_TYPES)
  get_property(_fsReqPkgTypes GLOBAL PROPERTY FeatureSummary_REQUIRED_PKG_TYPES)
  foreach(_fsPkgType ${_fsPkgTypes})
    list(APPEND validWhatParts "${_fsPkgType}_PACKAGES_FOUND"
                               "${_fsPkgType}_PACKAGES_NOT_FOUND")
  endforeach()

  set(title_ENABLED_FEATURES               "The following features have been enabled:")
  set(title_DISABLED_FEATURES              "The following features have been disabled:")
  set(title_PACKAGES_FOUND                 "The following packages have been found:")
  set(title_PACKAGES_NOT_FOUND             "The following packages have not been found:")
  foreach(_fsPkgType ${_fsPkgTypes})
    set(_fsPkgTypeDescription "${_fsPkgType} packages")
    get_property(_fsPkgTypeDescriptionIsSet GLOBAL PROPERTY FeatureSummary_${_fsPkgType}_DESCRIPTION SET)
    if(_fsPkgTypeDescriptionIsSet)
      get_property(_fsPkgTypeDescription GLOBAL PROPERTY FeatureSummary_${_fsPkgType}_DESCRIPTION )
    endif()
    set(title_${_fsPkgType}_PACKAGES_FOUND     "The following ${_fsPkgTypeDescription} have been found:")
    set(title_${_fsPkgType}_PACKAGES_NOT_FOUND "The following ${_fsPkgTypeDescription} have not been found:")
  endforeach()

  list(FIND validWhatParts "${_FS_WHAT}" indexInList)
  if(NOT "${indexInList}" STREQUAL "-1")
    _FS_GET_FEATURE_SUMMARY( ${_FS_WHAT} _featureSummary ${_FS_INCLUDE_QUIET_PACKAGES} )
    if(_featureSummary OR NOT _FS_QUIET_ON_EMPTY)
      if(_FS_DEFAULT_DESCRIPTION)
        set(_fullText "${title_${_FS_WHAT}}\n${_featureSummary}\n")
      else()
        set(_fullText "${_FS_DESCRIPTION}${_featureSummary}\n")
      endif()
    endif()

    if(_featureSummary)
      foreach(_fsReqPkgType ${_fsReqPkgTypes})
        if("${_FS_WHAT}" STREQUAL "${_fsReqPkgType}_PACKAGES_NOT_FOUND")
          set(requiredPackagesNotFound TRUE)
          break()
        endif()
      endforeach()
    endif()

  else()
    if("${_FS_WHAT}" STREQUAL "ALL")

      set(allWhatParts "ENABLED_FEATURES")
      foreach(_fsPkgType ${_fsPkgTypes})
        list(APPEND allWhatParts "${_fsPkgType}_PACKAGES_FOUND")
      endforeach()
      list(APPEND allWhatParts "DISABLED_FEATURES")
      foreach(_fsPkgType ${_fsPkgTypes})
        list(APPEND allWhatParts "${_fsPkgType}_PACKAGES_NOT_FOUND")
      endforeach()
    else()
      set(allWhatParts)
      foreach(part ${_FS_WHAT})
        list(FIND validWhatParts "${part}" indexInList)
        if(NOT "${indexInList}" STREQUAL "-1")
          list(APPEND allWhatParts "${part}")
        else()
          if("${part}" STREQUAL "ALL")
            message(FATAL_ERROR "The WHAT argument of FEATURE_SUMMARY() contains ALL, which cannot be combined with other values.")
          else()
            message(FATAL_ERROR "The WHAT argument of FEATURE_SUMMARY() contains ${part}, which is not a valid value.")
          endif()
        endif()
      endforeach()
    endif()

    set(_fullText "${_FS_DESCRIPTION}")
    foreach(part ${allWhatParts})
      set(_tmp)
      _FS_GET_FEATURE_SUMMARY( ${part} _tmp ${_FS_INCLUDE_QUIET_PACKAGES})
      if(_tmp)
        if(_fullText)
          string(APPEND _fullText "\n-- ")
        endif()
        string(APPEND _fullText "${title_${part}}\n${_tmp}\n")
        foreach(_fsReqPkgType ${_fsReqPkgTypes})
          if("${part}" STREQUAL "${_fsReqPkgType}_PACKAGES_NOT_FOUND")
            set(requiredPackagesNotFound TRUE)
            break()
          endif()
        endforeach()
      endif()
    endforeach()
  endif()

  if(_fullText OR NOT _FS_QUIET_ON_EMPTY)
    if(_FS_FILENAME)
      if(_FS_APPEND)
        file(APPEND "${_FS_FILENAME}" "${_fullText}")
      else()
        file(WRITE  "${_FS_FILENAME}" "${_fullText}")
      endif()

    else()
      if(NOT _FS_VAR)
        message(STATUS "${_fullText}")
      endif()
    endif()

    if(_FS_VAR)
      set(${_FS_VAR} "${_fullText}" PARENT_SCOPE)
    endif()
  endif()

  if(requiredPackagesNotFound  AND  _FS_FATAL_ON_MISSING_REQUIRED_PACKAGES)
    message(FATAL_ERROR "feature_summary() Error: REQUIRED package(s) are missing, aborting CMake run.")
  endif()

endfunction()

#[=======================================================================[.rst:
.. command:: set_package_properties

  ::

    set_package_properties(<name> PROPERTIES
                           [ URL <url> ]
                           [ DESCRIPTION <description> ]
                           [ TYPE (RUNTIME|OPTIONAL|RECOMMENDED|REQUIRED) ]
                           [ PURPOSE <purpose> ]
                          )

  Use this macro to set up information about the named package, which
  can then be displayed via FEATURE_SUMMARY().  This can be done either
  directly in the Find-module or in the project which uses the module
  after the find_package() call.  The features for which information can
  be set are added automatically by the find_package() command.

  ``URL <url>``
    This should be the homepage of the package, or something similar.
    Ideally this is set already directly in the Find-module.

  ``DESCRIPTION <description>``
    A short description what that package is, at most one sentence.
    Ideally this is set already directly in the Find-module.

  ``TYPE <type>``
    What type of dependency has the using project on that package.
    Default is ``OPTIONAL``.  In this case it is a package which can be used
    by the project when available at buildtime, but it also work without.
    ``RECOMMENDED`` is similar to ``OPTIONAL``, i.e.  the project will build if
    the package is not present, but the functionality of the resulting
    binaries will be severely limited.  If a ``REQUIRED`` package is not
    available at buildtime, the project may not even build.  This can be
    combined with the ``FATAL_ON_MISSING_REQUIRED_PACKAGES`` argument for
    ``feature_summary()``.  Last, a ``RUNTIME`` package is a package which is
    actually not used at all during the build, but which is required for
    actually running the resulting binaries.  So if such a package is
    missing, the project can still be built, but it may not work later on.
    If ``set_package_properties()`` is called multiple times for the same
    package with different TYPEs, the ``TYPE`` is only changed to higher
    TYPEs (``RUNTIME < OPTIONAL < RECOMMENDED < REQUIRED``), lower TYPEs are
    ignored.  The ``TYPE`` property is project-specific, so it cannot be set
    by the Find-module, but must be set in the project.
    Type accepted can be changed by setting the
    :variable:`FeatureSummary_PKG_TYPES` global property.

  ``PURPOSE <purpose>``
    This describes which features this package enables in the
    project, i.e.  it tells the user what functionality he gets in the
    resulting binaries.  If set_package_properties() is called multiple
    times for a package, all PURPOSE properties are appended to a list of
    purposes of the package in the project.  As the TYPE property, also
    the PURPOSE property is project-specific, so it cannot be set by the
    Find-module, but must be set in the project.

  Example for setting the info for a package:

  .. code-block:: cmake

    find_package(LibXml2)
    set_package_properties(LibXml2 PROPERTIES
                           DESCRIPTION "A XML processing library."
                           URL "http://xmlsoft.org/")
    # or
    set_package_properties(LibXml2 PROPERTIES
                           TYPE RECOMMENDED
                           PURPOSE "Enables HTML-import in MyWordProcessor")
    # or
    set_package_properties(LibXml2 PROPERTIES
                           TYPE OPTIONAL
                           PURPOSE "Enables odt-export in MyWordProcessor")

    find_package(DBUS)
    set_package_properties(DBUS PROPERTIES
      TYPE RUNTIME
      PURPOSE "Necessary to disable the screensaver during a presentation")
#]=======================================================================]
function(SET_PACKAGE_PROPERTIES _name _props)
  if(NOT "${_props}" STREQUAL "PROPERTIES")
    message(FATAL_ERROR "PROPERTIES keyword is missing in SET_PACKAGE_PROPERTIES() call.")
  endif()

  set(options ) # none
  set(oneValueArgs DESCRIPTION URL TYPE PURPOSE )
  set(multiValueArgs ) # none

  CMAKE_PARSE_ARGUMENTS(_SPP "${options}" "${oneValueArgs}" "${multiValueArgs}"  ${ARGN})

  if(_SPP_UNPARSED_ARGUMENTS)
    message(FATAL_ERROR "Unknown keywords given to SET_PACKAGE_PROPERTIES(): \"${_SPP_UNPARSED_ARGUMENTS}\"")
  endif()

  if(_SPP_DESCRIPTION)
    get_property(_info  GLOBAL PROPERTY _CMAKE_${_name}_DESCRIPTION)
    if(_info AND NOT "${_info}" STREQUAL "${_SPP_DESCRIPTION}")
      message(STATUS "Warning: Property DESCRIPTION for package ${_name} already set to \"${_info}\", overriding it with \"${_SPP_DESCRIPTION}\"")
    endif()

    set_property(GLOBAL PROPERTY _CMAKE_${_name}_DESCRIPTION "${_SPP_DESCRIPTION}" )
  endif()


  if(_SPP_URL)
    get_property(_info  GLOBAL PROPERTY _CMAKE_${_name}_URL)
    if(_info AND NOT "${_info}" STREQUAL "${_SPP_URL}")
      message(STATUS "Warning: Property URL already set to \"${_info}\", overriding it with \"${_SPP_URL}\"")
    endif()

    set_property(GLOBAL PROPERTY _CMAKE_${_name}_URL "${_SPP_URL}" )
  endif()


  # handle the PURPOSE: use APPEND, since there can be multiple purposes for one package inside a project
  if(_SPP_PURPOSE)
    set_property(GLOBAL APPEND PROPERTY _CMAKE_${_name}_PURPOSE "${_SPP_PURPOSE}" )
  endif()

  get_property(_fsPkgTypes GLOBAL PROPERTY FeatureSummary_PKG_TYPES)
  get_property(_fsDefaultPkgType GLOBAL PROPERTY FeatureSummary_DEFAULT_PKG_TYPE)

  # handle the TYPE
  if(DEFINED _SPP_TYPE)
    # Supported types are listed in FeatureSummary_PKG_TYPES according to their priority
    get_property(_fsPkgTypes GLOBAL PROPERTY FeatureSummary_PKG_TYPES)
    list(FIND _fsPkgTypes ${_SPP_TYPE} _typeIndexInList)
    if("${_typeIndexInList}" STREQUAL "-1" )
      string(REGEX REPLACE ";([^;]+)$" " and \\1" _fsPkgTypes_msg "${_fsPkgTypes}")
      string(REPLACE ";" ", " _fsPkgTypes_msg "${_fsPkgTypes_msg}")
      message(FATAL_ERROR "Bad package property type ${_SPP_TYPE} used in SET_PACKAGE_PROPERTIES(). "
                          "Valid types are ${_fsPkgTypes_msg}." )
    endif()

    get_property(_previousType  GLOBAL PROPERTY _CMAKE_${_name}_TYPE)
    list(FIND _fsPkgTypes "${_previousType}" _prevTypeIndexInList)

    # make sure a previously set TYPE is not overridden with a lower new TYPE:
    if("${_typeIndexInList}" GREATER "${_prevTypeIndexInList}")
      set_property(GLOBAL PROPERTY _CMAKE_${_name}_TYPE "${_SPP_TYPE}" )
    endif()
  endif()

endfunction()

#[=======================================================================[.rst:
.. command:: add_feature_info

  ::

    add_feature_info(<name> <enabled> <description>)

  Use this macro to add information about a feature with the given ``<name>``.
  ``<enabled>`` contains whether this feature is enabled or not. It can be a
  variable or a list of conditions.
  ``<description>`` is a text describing the feature.  The information can
  be displayed using ``feature_summary()`` for ``ENABLED_FEATURES`` and
  ``DISABLED_FEATURES`` respectively.

  Example for setting the info for a feature:

  .. code-block:: cmake

     option(WITH_FOO "Help for foo" ON)
     add_feature_info(Foo WITH_FOO "The Foo feature provides very cool stuff.")
#]=======================================================================]
function(ADD_FEATURE_INFO _name _depends _desc)
  set(_enabled 1)
  foreach(_d ${_depends})
    string(REGEX REPLACE " +" ";" _d "${_d}")
    if(${_d})
    else()
      set(_enabled 0)
      break()
    endif()
  endforeach()
  if (${_enabled})
    set_property(GLOBAL APPEND PROPERTY ENABLED_FEATURES "${_name}")
  else ()
    set_property(GLOBAL APPEND PROPERTY DISABLED_FEATURES "${_name}")
  endif ()

  set_property(GLOBAL PROPERTY _CMAKE_${_name}_DESCRIPTION "${_desc}" )
endfunction()


# The stuff below is only kept for compatibility

#[=======================================================================[.rst:
Legacy Macros
^^^^^^^^^^^^^

The following macros are provided for compatibility with previous
CMake versions:

.. command:: set_package_info

  ::

    set_package_info(<name> <description> [ <url> [<purpose>] ])

  Use this macro to set up information about the named package, which
  can then be displayed via ``feature_summary()``.  This can be done either
  directly in the Find-module or in the project which uses the module
  after the :command:`find_package` call.  The features for which information
  can be set are added automatically by the ``find_package()`` command.
#]=======================================================================]
function(SET_PACKAGE_INFO _name _desc)
  message(DEPRECATION "SET_PACKAGE_INFO is deprecated. Use SET_PACKAGE_PROPERTIES instead.")
  unset(_url)
  unset(_purpose)
  if(ARGC GREATER 2)
    set(_url "${ARGV2}")
  endif()
  if(ARGC GREATER 3)
    set(_purpose "${ARGV3}")
  endif()
  set_property(GLOBAL PROPERTY _CMAKE_${_name}_DESCRIPTION "${_desc}" )
  if(NOT _url STREQUAL "")
    set_property(GLOBAL PROPERTY _CMAKE_${_name}_URL "${_url}" )
  endif()
  if(NOT _purpose STREQUAL "")
    set_property(GLOBAL APPEND PROPERTY _CMAKE_${_name}_PURPOSE "${_purpose}" )
  endif()
endfunction()

#[=======================================================================[.rst:
.. command:: set_feature_info

  ::

    set_feature_info(<name> <description> [<url>])

  Does the same as::

    set_package_info(<name> <description> <url>)
#]=======================================================================]
function(SET_FEATURE_INFO)
  message(DEPRECATION "SET_FEATURE_INFO is deprecated. Use ADD_FEATURE_INFO instead.")
  SET_PACKAGE_INFO(${ARGN})
endfunction()

#[=======================================================================[.rst:
.. command:: print_enabled_features

  ::

    print_enabled_features()

  Does the same as

  .. code-block:: cmake

    feature_summary(WHAT ENABLED_FEATURES DESCRIPTION "Enabled features:")
#]=======================================================================]
function(PRINT_ENABLED_FEATURES)
  message(DEPRECATION "PRINT_ENABLED_FEATURES is deprecated. Use
    feature_summary(WHAT ENABLED_FEATURES DESCRIPTION \"Enabled features:\")")
  FEATURE_SUMMARY(WHAT ENABLED_FEATURES  DESCRIPTION "Enabled features:")
endfunction()

#[=======================================================================[.rst:
.. command:: print_disabled_features

  ::

    print_disabled_features()

  Does the same as

  .. code-block:: cmake

    feature_summary(WHAT DISABLED_FEATURES DESCRIPTION "Disabled features:")
#]=======================================================================]
function(PRINT_DISABLED_FEATURES)
  message(DEPRECATION "PRINT_DISABLED_FEATURES is deprecated. Use
    feature_summary(WHAT DISABLED_FEATURES DESCRIPTION \"Disabled features:\")")
  FEATURE_SUMMARY(WHAT DISABLED_FEATURES  DESCRIPTION "Disabled features:")
endfunction()