diff --git a/Help/command/cmake_parse_arguments.rst b/Help/command/cmake_parse_arguments.rst
index c8327e2..196d90f 100644
--- a/Help/command/cmake_parse_arguments.rst
+++ b/Help/command/cmake_parse_arguments.rst
@@ -59,6 +59,11 @@
 where recognized. This can be checked afterwards to see
 whether your macro was called with unrecognized parameters.
 
+``<one_value_keywords>`` and ``<multi_value_keywords>`` that where given no
+values at all are collected in a variable ``<prefix>_KEYWORDS_MISSING_VALUES``
+that will be undefined if all keywords received values. This can be checked
+to see if there where keywords without any values given.
+
 As an example here a ``my_install()`` macro, which takes similar arguments
 as the real :command:`install` command:
 
@@ -77,7 +82,7 @@
 
 .. code-block:: cmake
 
-   my_install(TARGETS foo bar DESTINATION bin OPTIONAL blub)
+   my_install(TARGETS foo bar DESTINATION bin OPTIONAL blub CONFIGURATIONS)
 
 After the ``cmake_parse_arguments`` call the macro will have set or undefined
 the following variables::
@@ -89,6 +94,8 @@
    MY_INSTALL_TARGETS = "foo;bar"
    MY_INSTALL_CONFIGURATIONS <UNDEFINED> # was not used
    MY_INSTALL_UNPARSED_ARGUMENTS = "blub" # nothing expected after "OPTIONAL"
+   MY_INSTALL_KEYWORDS_MISSING_VALUES = "CONFIGURATIONS"
+            # No value for "CONFIGURATIONS" given
 
 You can then continue and process these variables.
 
@@ -97,5 +104,6 @@
 interpreted as the beginning of the new option.  E.g.
 ``my_install(TARGETS foo DESTINATION OPTIONAL)`` would result in
 ``MY_INSTALL_DESTINATION`` set to ``"OPTIONAL"``, but as ``OPTIONAL``
-is a keyword itself ``MY_INSTALL_DESTINATION`` will be empty and
-``MY_INSTALL_OPTIONAL`` will therefore be set to ``TRUE``.
+is a keyword itself ``MY_INSTALL_DESTINATION`` will be empty (but added
+to ``MY_INSTALL_KEYWORDS_MISSING_VALUES``) and ``MY_INSTALL_OPTIONAL`` will
+therefore be set to ``TRUE``.
diff --git a/Help/generator/Green Hills MULTI.rst b/Help/generator/Green Hills MULTI.rst
index bfe671f..e474682 100644
--- a/Help/generator/Green Hills MULTI.rst
+++ b/Help/generator/Green Hills MULTI.rst
@@ -59,6 +59,7 @@
 The following properties are available:
 
 * :prop_tgt:`GHS_INTEGRITY_APP`
+* :prop_tgt:`GHS_NO_SOURCE_GROUP_FILE`
 
 .. note::
   This generator is deemed experimental as of CMake |release|
diff --git a/Help/manual/cmake-properties.7.rst b/Help/manual/cmake-properties.7.rst
index e1de134..4366c0d 100644
--- a/Help/manual/cmake-properties.7.rst
+++ b/Help/manual/cmake-properties.7.rst
@@ -195,6 +195,7 @@
    /prop_tgt/FRAMEWORK_VERSION
    /prop_tgt/GENERATOR_FILE_NAME
    /prop_tgt/GHS_INTEGRITY_APP
+   /prop_tgt/GHS_NO_SOURCE_GROUP_FILE
    /prop_tgt/GNUtoMS
    /prop_tgt/HAS_CXX
    /prop_tgt/IMPLICIT_DEPENDS_INCLUDE_TRANSFORM
diff --git a/Help/manual/cmake-variables.7.rst b/Help/manual/cmake-variables.7.rst
index 1698734..83c88a5 100644
--- a/Help/manual/cmake-variables.7.rst
+++ b/Help/manual/cmake-variables.7.rst
@@ -345,6 +345,7 @@
    /variable/CMAKE_FOLDER
    /variable/CMAKE_Fortran_FORMAT
    /variable/CMAKE_Fortran_MODULE_DIRECTORY
+   /variable/CMAKE_GHS_NO_SOURCE_GROUP_FILE
    /variable/CMAKE_GLOBAL_AUTOGEN_TARGET
    /variable/CMAKE_GLOBAL_AUTOGEN_TARGET_NAME
    /variable/CMAKE_GLOBAL_AUTORCC_TARGET
diff --git a/Help/prop_tgt/GHS_NO_SOURCE_GROUP_FILE.rst b/Help/prop_tgt/GHS_NO_SOURCE_GROUP_FILE.rst
new file mode 100644
index 0000000..11ce0b22
--- /dev/null
+++ b/Help/prop_tgt/GHS_NO_SOURCE_GROUP_FILE.rst
@@ -0,0 +1,13 @@
+GHS_NO_SOURCE_GROUP_FILE
+------------------------
+
+``ON`` / ``OFF`` boolean to control if the project file for a target should
+be one single file or multiple files.
+
+The default behavior or when the property is ``OFF`` is to generate a project
+file for the target and then a sub-project file for each source group.
+
+When this property is ``ON`` or if :variable:`CMAKE_GHS_NO_SOURCE_GROUP_FILE`
+is ``ON`` then only a single project file is generated for the target.
+
+Supported on :generator:`Green Hills MULTI`.
diff --git a/Help/release/3.14.rst b/Help/release/3.14.rst
index afc2f5f..13d209f 100644
--- a/Help/release/3.14.rst
+++ b/Help/release/3.14.rst
@@ -25,6 +25,34 @@
   platform.  The VS host toolset selection is now based on the host
   architecture as well.
 
+* The :generator:`Green Hills MULTI` generator has been updated:
+
+  * Now supports :ref:`Object Libraries`.
+
+  * Now warns on unsupported project types such as shared libraries.
+
+  * Now generates a top-level ``<PROJECT-NAME>.top.gpj`` for each directory
+    calling the :command:`project` command.  The top-level project file
+    ``default.gpj`` is no longer created.
+
+  * Now honors target renaming and destination output control properties
+    such as :prop_tgt:`RUNTIME_OUTPUT_DIRECTORY` and :prop_tgt:`OUTPUT_NAME`.
+    This also fixes support for installation rules generated by
+    :command:`install`.
+
+  * Now honors source file properties :prop_sf:`INCLUDE_DIRECTORIES`,
+    :prop_sf:`COMPILE_DEFINITIONS`, and :prop_sf:`COMPILE_OPTIONS`.
+
+  * Now supports Dynamic Download Integrity Applications which did not include
+    Integrate Files via :prop_tgt:`GHS_INTEGRITY_APP` and setting a target
+    link flag of ``-dynamic``.
+
+  * The contents of project files now sorts sources groups and files by name.
+    Set the :prop_tgt:`GHS_NO_SOURCE_GROUP_FILE` target property to ``ON`` to
+    generate a single project file for the target instead of a project file for
+    each source group.  Set the :variable:`CMAKE_GHS_NO_SOURCE_GROUP_FILE`
+    variable to enable this for all targets.
+
 File-Based API
 --------------
 
@@ -56,6 +84,9 @@
 Commands
 --------
 
+* The :command:`file` command learned a new sub-command, ``CREATE_LINK``,
+  which can be used to create hard or symbolic links.
+
 * The :command:`file` command learned a new sub-command, ``READ_SYMLINK``,
   which can be used to determine the path that a symlink points to.
 
diff --git a/Help/release/dev/cmake_parse_arguments-keywords_missing_values.rst b/Help/release/dev/cmake_parse_arguments-keywords_missing_values.rst
new file mode 100644
index 0000000..c7fe96b
--- /dev/null
+++ b/Help/release/dev/cmake_parse_arguments-keywords_missing_values.rst
@@ -0,0 +1,6 @@
+cmake_parse_arguments-keywords_missing_values
+---------------------------------------------
+
+* The :command:`cmake_parse_arguments` command gained an additional
+  ``<prefix>_KEYWORDS_MISSING_VALUES`` output variable to report
+  keyword arguments that were given by the caller with no values.
diff --git a/Help/variable/CMAKE_GHS_NO_SOURCE_GROUP_FILE.rst b/Help/variable/CMAKE_GHS_NO_SOURCE_GROUP_FILE.rst
new file mode 100644
index 0000000..b6768a1
--- /dev/null
+++ b/Help/variable/CMAKE_GHS_NO_SOURCE_GROUP_FILE.rst
@@ -0,0 +1,6 @@
+CMAKE_GHS_NO_SOURCE_GROUP_FILE
+------------------------------
+
+``ON`` / ``OFF`` boolean to control if the project file for a target should
+be one single file or multiple files.  Refer to
+:prop_tgt:`GHS_NO_SOURCE_GROUP_FILE` for further details.
diff --git a/Source/CMakeVersion.cmake b/Source/CMakeVersion.cmake
index 39cb7e6..6c6b3a0 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 14)
-set(CMake_VERSION_PATCH 20190207)
+set(CMake_VERSION_PATCH 20190211)
 #set(CMake_VERSION_RC 1)
diff --git a/Source/CPack/IFW/cmCPackIFWGenerator.cxx b/Source/CPack/IFW/cmCPackIFWGenerator.cxx
index 9102e3e..c1b6eea 100644
--- a/Source/CPack/IFW/cmCPackIFWGenerator.cxx
+++ b/Source/CPack/IFW/cmCPackIFWGenerator.cxx
@@ -85,8 +85,8 @@
     int retVal = 1;
     cmCPackIFWLogger(OUTPUT, "- Generate repository" << std::endl);
     bool res = cmSystemTools::RunSingleCommand(
-      ifwCmd.c_str(), &output, &output, &retVal, nullptr,
-      this->GeneratorVerbose, cmDuration::zero());
+      ifwCmd, &output, &output, &retVal, nullptr, this->GeneratorVerbose,
+      cmDuration::zero());
     if (!res || retVal) {
       cmGeneratedFileStream ofs(ifwTmpFile);
       ofs << "# Run command: " << ifwCmd << std::endl
@@ -198,8 +198,8 @@
     int retVal = 1;
     cmCPackIFWLogger(OUTPUT, "- Generate package" << std::endl);
     bool res = cmSystemTools::RunSingleCommand(
-      ifwCmd.c_str(), &output, &output, &retVal, nullptr,
-      this->GeneratorVerbose, cmDuration::zero());
+      ifwCmd, &output, &output, &retVal, nullptr, this->GeneratorVerbose,
+      cmDuration::zero());
     if (!res || retVal) {
       cmGeneratedFileStream ofs(ifwTmpFile);
       ofs << "# Run command: " << ifwCmd << std::endl
diff --git a/Source/CPack/WiX/cmCPackWIXGenerator.cxx b/Source/CPack/WiX/cmCPackWIXGenerator.cxx
index 398ebd3..f522ce2 100644
--- a/Source/CPack/WiX/cmCPackWIXGenerator.cxx
+++ b/Source/CPack/WiX/cmCPackWIXGenerator.cxx
@@ -61,9 +61,8 @@
   std::string output;
 
   int returnValue = 0;
-  bool status = cmSystemTools::RunSingleCommand(command.c_str(), &output,
-                                                &output, &returnValue, 0,
-                                                cmSystemTools::OUTPUT_NONE);
+  bool status = cmSystemTools::RunSingleCommand(
+    command, &output, &output, &returnValue, 0, cmSystemTools::OUTPUT_NONE);
 
   cmsys::ofstream logFile(logFileName.c_str(), std::ios::app);
   logFile << command << std::endl;
diff --git a/Source/CPack/cmCPackDragNDropGenerator.cxx b/Source/CPack/cmCPackDragNDropGenerator.cxx
index 013ad81..7a3742b 100644
--- a/Source/CPack/cmCPackDragNDropGenerator.cxx
+++ b/Source/CPack/cmCPackDragNDropGenerator.cxx
@@ -244,8 +244,8 @@
   int exit_code = 1;
 
   bool result = cmSystemTools::RunSingleCommand(
-    command.str().c_str(), output, output, &exit_code, nullptr,
-    this->GeneratorVerbose, cmDuration::zero());
+    command.str(), output, output, &exit_code, nullptr, this->GeneratorVerbose,
+    cmDuration::zero());
 
   if (!result || exit_code) {
     cmCPackLogger(cmCPackLog::LOG_ERROR,
diff --git a/Source/CPack/cmCPackGenerator.cxx b/Source/CPack/cmCPackGenerator.cxx
index 57c0545..b4c05ab 100644
--- a/Source/CPack/cmCPackGenerator.cxx
+++ b/Source/CPack/cmCPackGenerator.cxx
@@ -278,7 +278,7 @@
       std::string output;
       int retVal = 1;
       bool resB = cmSystemTools::RunSingleCommand(
-        ic.c_str(), &output, &output, &retVal, nullptr, this->GeneratorVerbose,
+        ic, &output, &output, &retVal, nullptr, this->GeneratorVerbose,
         cmDuration::zero());
       if (!resB || retVal) {
         std::string tmpFile = this->GetOption("CPACK_TOPLEVEL_DIRECTORY");
@@ -647,8 +647,8 @@
     std::string output;
     int retVal = 1;
     bool resB = cmSystemTools::RunSingleCommand(
-      buildCommand.c_str(), &output, &output, &retVal,
-      installDirectory.c_str(), this->GeneratorVerbose, cmDuration::zero());
+      buildCommand, &output, &output, &retVal, installDirectory.c_str(),
+      this->GeneratorVerbose, cmDuration::zero());
     if (!resB || retVal) {
       std::string tmpFile = this->GetOption("CPACK_TOPLEVEL_DIRECTORY");
       tmpFile += "/PreinstallOutput.log";
diff --git a/Source/CPack/cmCPackNSISGenerator.cxx b/Source/CPack/cmCPackNSISGenerator.cxx
index 37ea66e..c77eebc 100644
--- a/Source/CPack/cmCPackNSISGenerator.cxx
+++ b/Source/CPack/cmCPackNSISGenerator.cxx
@@ -302,8 +302,8 @@
   std::string output;
   int retVal = 1;
   bool res = cmSystemTools::RunSingleCommand(
-    nsisCmd.c_str(), &output, &output, &retVal, nullptr,
-    this->GeneratorVerbose, cmDuration::zero());
+    nsisCmd, &output, &output, &retVal, nullptr, this->GeneratorVerbose,
+    cmDuration::zero());
   if (!res || retVal) {
     cmGeneratedFileStream ofs(tmpFile);
     ofs << "# Run command: " << nsisCmd << std::endl
@@ -407,8 +407,8 @@
   std::string output;
   int retVal = 1;
   bool resS = cmSystemTools::RunSingleCommand(
-    nsisCmd.c_str(), &output, &output, &retVal, nullptr,
-    this->GeneratorVerbose, cmDuration::zero());
+    nsisCmd, &output, &output, &retVal, nullptr, this->GeneratorVerbose,
+    cmDuration::zero());
   cmsys::RegularExpression versionRex("v([0-9]+.[0-9]+)");
   cmsys::RegularExpression versionRexCVS("v(.*)\\.cvs");
   if (!resS || retVal ||
@@ -749,7 +749,7 @@
     std::string output;
     int retVal = -1;
     int res = cmSystemTools::RunSingleCommand(
-      cmd.c_str(), &output, &output, &retVal, dirName.c_str(),
+      cmd, &output, &output, &retVal, dirName.c_str(),
       cmSystemTools::OUTPUT_NONE, cmDuration::zero());
     if (!res || retVal) {
       std::string tmpFile = this->GetOption("CPACK_TOPLEVEL_DIRECTORY");
diff --git a/Source/CPack/cmCPackOSXX11Generator.cxx b/Source/CPack/cmCPackOSXX11Generator.cxx
index 486633c..85248c6 100644
--- a/Source/CPack/cmCPackOSXX11Generator.cxx
+++ b/Source/CPack/cmCPackOSXX11Generator.cxx
@@ -155,8 +155,8 @@
   bool res = false;
   while (numTries > 0) {
     res = cmSystemTools::RunSingleCommand(
-      dmgCmd.str().c_str(), &output, &output, &retVal, nullptr,
-      this->GeneratorVerbose, cmDuration::zero());
+      dmgCmd.str(), &output, &output, &retVal, nullptr, this->GeneratorVerbose,
+      cmDuration::zero());
     if (res && !retVal) {
       numTries = -1;
       break;
diff --git a/Source/CPack/cmCPackPackageMakerGenerator.cxx b/Source/CPack/cmCPackPackageMakerGenerator.cxx
index 246178d..3d93c48 100644
--- a/Source/CPack/cmCPackPackageMakerGenerator.cxx
+++ b/Source/CPack/cmCPackPackageMakerGenerator.cxx
@@ -295,8 +295,8 @@
   bool res = false;
   while (numTries > 0) {
     res = cmSystemTools::RunSingleCommand(
-      dmgCmd.str().c_str(), &output, &output, &retVal, nullptr,
-      this->GeneratorVerbose, cmDuration::zero());
+      dmgCmd.str(), &output, &output, &retVal, nullptr, this->GeneratorVerbose,
+      cmDuration::zero());
     if (res && !retVal) {
       numTries = -1;
       break;
diff --git a/Source/CPack/cmCPackProductBuildGenerator.cxx b/Source/CPack/cmCPackProductBuildGenerator.cxx
index a556e0c..94b5b5f 100644
--- a/Source/CPack/cmCPackProductBuildGenerator.cxx
+++ b/Source/CPack/cmCPackProductBuildGenerator.cxx
@@ -145,8 +145,8 @@
   std::string output;
   int retVal = 1;
   bool res = cmSystemTools::RunSingleCommand(
-    command.c_str(), &output, &output, &retVal, nullptr,
-    this->GeneratorVerbose, cmDuration::zero());
+    command, &output, &output, &retVal, nullptr, this->GeneratorVerbose,
+    cmDuration::zero());
   cmCPackLogger(cmCPackLog::LOG_VERBOSE, "Done running command" << std::endl);
   if (!res || retVal) {
     cmGeneratedFileStream ofs(tmpFile);
diff --git a/Source/CTest/cmCTestBuildAndTestHandler.cxx b/Source/CTest/cmCTestBuildAndTestHandler.cxx
index 2fd4c7a..3856569 100644
--- a/Source/CTest/cmCTestBuildAndTestHandler.cxx
+++ b/Source/CTest/cmCTestBuildAndTestHandler.cxx
@@ -118,7 +118,7 @@
     : CM(cm)
   {
     cmSystemTools::SetMessageCallback(
-      [&s](const char* msg, const char* /*unused*/) {
+      [&s](const std::string& msg, const char* /*unused*/) {
         s += msg;
         s += "\n";
       });
diff --git a/Source/CTest/cmCTestScriptHandler.cxx b/Source/CTest/cmCTestScriptHandler.cxx
index 6b57c43..2cbdc4e 100644
--- a/Source/CTest/cmCTestScriptHandler.cxx
+++ b/Source/CTest/cmCTestScriptHandler.cxx
@@ -607,9 +607,8 @@
     cmCTestLog(this->CTest, HANDLER_VERBOSE_OUTPUT,
                "Run cvs: " << this->CVSCheckOut << std::endl);
     res = cmSystemTools::RunSingleCommand(
-      this->CVSCheckOut.c_str(), &output, &output, &retVal,
-      this->CTestRoot.c_str(), this->HandlerVerbose,
-      cmDuration::zero() /*this->TimeOut*/);
+      this->CVSCheckOut, &output, &output, &retVal, this->CTestRoot.c_str(),
+      this->HandlerVerbose, cmDuration::zero() /*this->TimeOut*/);
     if (!res || retVal != 0) {
       cmSystemTools::Error("Unable to perform cvs checkout:\n",
                            output.c_str());
@@ -675,7 +674,7 @@
       cmCTestLog(this->CTest, HANDLER_VERBOSE_OUTPUT,
                  "Run Update: " << fullCommand << std::endl);
       res = cmSystemTools::RunSingleCommand(
-        fullCommand.c_str(), &output, &output, &retVal, cvsArgs[0].c_str(),
+        fullCommand, &output, &output, &retVal, cvsArgs[0].c_str(),
         this->HandlerVerbose, cmDuration::zero() /*this->TimeOut*/);
       if (!res || retVal != 0) {
         cmSystemTools::Error("Unable to perform extra updates:\n", eu.c_str(),
@@ -779,7 +778,7 @@
     cmCTestLog(this->CTest, HANDLER_VERBOSE_OUTPUT,
                "Run cmake command: " << command << std::endl);
     res = cmSystemTools::RunSingleCommand(
-      command.c_str(), &output, &output, &retVal, this->BinaryDir.c_str(),
+      command, &output, &output, &retVal, this->BinaryDir.c_str(),
       this->HandlerVerbose, cmDuration::zero() /*this->TimeOut*/);
 
     if (!this->CMOutFile.empty()) {
@@ -818,7 +817,7 @@
     cmCTestLog(this->CTest, HANDLER_VERBOSE_OUTPUT,
                "Run ctest command: " << command << std::endl);
     res = cmSystemTools::RunSingleCommand(
-      command.c_str(), &output, &output, &retVal, this->BinaryDir.c_str(),
+      command, &output, &output, &retVal, this->BinaryDir.c_str(),
       this->HandlerVerbose, cmDuration::zero() /*this->TimeOut*/);
 
     // did something critical fail in ctest
diff --git a/Source/CTest/cmCTestTestHandler.cxx b/Source/CTest/cmCTestTestHandler.cxx
index cf2652a..c9783e4 100644
--- a/Source/CTest/cmCTestTestHandler.cxx
+++ b/Source/CTest/cmCTestTestHandler.cxx
@@ -1486,7 +1486,7 @@
     int retVal = 0;
     cmCTestOptionalLog(this->CTest, HANDLER_VERBOSE_OUTPUT,
                        "Run command: " << it << std::endl, this->Quiet);
-    if (!cmSystemTools::RunSingleCommand(it.c_str(), nullptr, nullptr, &retVal,
+    if (!cmSystemTools::RunSingleCommand(it, nullptr, nullptr, &retVal,
                                          nullptr, cmSystemTools::OUTPUT_MERGE
                                          /*this->Verbose*/) ||
         retVal != 0) {
diff --git a/Source/CursesDialog/ccmake.cxx b/Source/CursesDialog/ccmake.cxx
index f2982a6..745c6bb 100644
--- a/Source/CursesDialog/ccmake.cxx
+++ b/Source/CursesDialog/ccmake.cxx
@@ -150,7 +150,7 @@
   }
 
   cmSystemTools::SetMessageCallback(
-    [myform](const char* message, const char* title) {
+    [myform](const std::string& message, const char* title) {
       myform->AddError(message, title);
     });
 
diff --git a/Source/CursesDialog/cmCursesForm.h b/Source/CursesDialog/cmCursesForm.h
index ddb67de..7842905 100644
--- a/Source/CursesDialog/cmCursesForm.h
+++ b/Source/CursesDialog/cmCursesForm.h
@@ -9,6 +9,8 @@
 
 #include "cmsys/FStream.hxx"
 
+#include <string>
+
 class cmCursesForm
 {
 public:
@@ -34,7 +36,7 @@
   // Description:
   // During a CMake run, an error handle should add errors
   // to be displayed afterwards.
-  virtual void AddError(const char*, const char*) {}
+  virtual void AddError(const std::string&, const char*) {}
 
   // Description:
   // Turn debugging on. This will create ccmakelog.txt.
diff --git a/Source/CursesDialog/cmCursesMainForm.cxx b/Source/CursesDialog/cmCursesMainForm.cxx
index b9a7c85..076ee3d 100644
--- a/Source/CursesDialog/cmCursesMainForm.cxx
+++ b/Source/CursesDialog/cmCursesMainForm.cxx
@@ -642,7 +642,8 @@
   return 0;
 }
 
-void cmCursesMainForm::AddError(const char* message, const char* /*unused*/)
+void cmCursesMainForm::AddError(const std::string& message,
+                                const char* /*unused*/)
 {
   this->Errors.emplace_back(message);
 }
diff --git a/Source/CursesDialog/cmCursesMainForm.h b/Source/CursesDialog/cmCursesMainForm.h
index cc6482f..c09ce2a 100644
--- a/Source/CursesDialog/cmCursesMainForm.h
+++ b/Source/CursesDialog/cmCursesMainForm.h
@@ -81,7 +81,7 @@
    * During a CMake run, an error handle should add errors
    * to be displayed afterwards.
    */
-  void AddError(const char* message, const char* title) override;
+  void AddError(const std::string& message, const char* title) override;
 
   /**
    * Used to do a configure. If argument is specified, it does only the check
diff --git a/Source/QtDialog/QCMake.cxx b/Source/QtDialog/QCMake.cxx
index bf7726e..c90c142 100644
--- a/Source/QtDialog/QCMake.cxx
+++ b/Source/QtDialog/QCMake.cxx
@@ -25,7 +25,7 @@
   cmSystemTools::SetRunCommandHideConsole(true);
 
   cmSystemTools::SetMessageCallback(
-    [this](const char* msg, const char* title) {
+    [this](std::string const& msg, const char* title) {
       this->messageCallback(msg, title);
     });
   cmSystemTools::SetStdoutCallback(
@@ -356,9 +356,9 @@
   QCoreApplication::processEvents();
 }
 
-void QCMake::messageCallback(const char* msg, const char* /*title*/)
+void QCMake::messageCallback(std::string const& msg, const char* /*title*/)
 {
-  emit this->errorMessage(QString::fromLocal8Bit(msg));
+  emit this->errorMessage(QString::fromStdString(msg));
   QCoreApplication::processEvents();
 }
 
diff --git a/Source/QtDialog/QCMake.h b/Source/QtDialog/QCMake.h
index ef4d2a1..8492606 100644
--- a/Source/QtDialog/QCMake.h
+++ b/Source/QtDialog/QCMake.h
@@ -169,7 +169,7 @@
 
   bool interruptCallback();
   void progressCallback(const char* msg, float percent);
-  void messageCallback(const char* msg, const char* title);
+  void messageCallback(std::string const& msg, const char* title);
   void stdoutCallback(std::string const& msg);
   void stderrCallback(std::string const& msg);
 
diff --git a/Source/cmExtraCodeBlocksGenerator.cxx b/Source/cmExtraCodeBlocksGenerator.cxx
index 345ecaa..9e90547 100644
--- a/Source/cmExtraCodeBlocksGenerator.cxx
+++ b/Source/cmExtraCodeBlocksGenerator.cxx
@@ -247,8 +247,8 @@
 
   // figure out the compiler
   std::string compiler = this->GetCBCompilerId(mf);
-  std::string make = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
-  const std::string makeArgs =
+  const std::string& make = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
+  const std::string& makeArgs =
     mf->GetSafeDefinition("CMAKE_CODEBLOCKS_MAKE_ARGUMENTS");
 
   cmXMLWriter xml(fout);
diff --git a/Source/cmExtraCodeLiteGenerator.cxx b/Source/cmExtraCodeLiteGenerator.cxx
index 0773edc..6fe8c14 100644
--- a/Source/cmExtraCodeLiteGenerator.cxx
+++ b/Source/cmExtraCodeLiteGenerator.cxx
@@ -628,8 +628,8 @@
 std::string cmExtraCodeLiteGenerator::GetBuildCommand(
   const cmMakefile* mf, const std::string& targetName) const
 {
-  std::string generator = mf->GetSafeDefinition("CMAKE_GENERATOR");
-  std::string make = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
+  const std::string& generator = mf->GetSafeDefinition("CMAKE_GENERATOR");
+  const std::string& make = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
   std::string buildCommand = make; // Default
   std::ostringstream ss;
   if (generator == "NMake Makefiles" || generator == "Ninja") {
@@ -669,8 +669,8 @@
   const cmMakefile* mf) const
 {
   std::string buildCommand;
-  std::string make = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
-  std::string generator = mf->GetSafeDefinition("CMAKE_GENERATOR");
+  const std::string& make = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
+  const std::string& generator = mf->GetSafeDefinition("CMAKE_GENERATOR");
   if (generator == "Unix Makefiles" || generator == "MinGW Makefiles") {
     std::ostringstream ss;
 #if defined(_WIN32)
diff --git a/Source/cmExtraEclipseCDT4Generator.cxx b/Source/cmExtraEclipseCDT4Generator.cxx
index 30067b7..a6ce8b7 100644
--- a/Source/cmExtraEclipseCDT4Generator.cxx
+++ b/Source/cmExtraEclipseCDT4Generator.cxx
@@ -878,8 +878,8 @@
   xml.Attribute("moduleId", "org.eclipse.cdt.make.core.buildtargets");
   xml.StartElement("buildTargets");
   emmited.clear();
-  const std::string make = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
-  const std::string makeArgs =
+  const std::string& make = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
+  const std::string& makeArgs =
     mf->GetSafeDefinition("CMAKE_ECLIPSE_MAKE_ARGUMENTS");
 
   cmGlobalGenerator* generator =
@@ -1074,7 +1074,8 @@
   cmXMLWriter& xml, const cmMakefile& makefile)
 {
   // we need the "make" and the C (or C++) compiler which are used, Alex
-  std::string make = makefile.GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
+  const std::string& make =
+    makefile.GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
   std::string compiler = makefile.GetSafeDefinition("CMAKE_C_COMPILER");
   std::string arg1 = makefile.GetSafeDefinition("CMAKE_C_COMPILER_ARG1");
   if (compiler.empty()) {
diff --git a/Source/cmExtraKateGenerator.cxx b/Source/cmExtraKateGenerator.cxx
index 23ba6b7..76de75d 100644
--- a/Source/cmExtraKateGenerator.cxx
+++ b/Source/cmExtraKateGenerator.cxx
@@ -75,8 +75,8 @@
                                         cmGeneratedFileStream& fout) const
 {
   cmMakefile const* mf = lg->GetMakefile();
-  const std::string make = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
-  const std::string makeArgs =
+  const std::string& make = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
+  const std::string& makeArgs =
     mf->GetSafeDefinition("CMAKE_KATE_MAKE_ARGUMENTS");
   std::string const& homeOutputDir = lg->GetBinaryDirectory();
 
diff --git a/Source/cmExtraSublimeTextGenerator.cxx b/Source/cmExtraSublimeTextGenerator.cxx
index 739a177..59cfdca 100644
--- a/Source/cmExtraSublimeTextGenerator.cxx
+++ b/Source/cmExtraSublimeTextGenerator.cxx
@@ -168,7 +168,7 @@
   const std::vector<cmLocalGenerator*>& lgs, const cmMakefile* mf,
   cmGeneratedFileStream& fout, MapSourceFileFlags& sourceFileFlags)
 {
-  std::string make = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
+  const std::string& make = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
   std::string compiler;
   if (!lgs.empty()) {
     this->AppendTarget(fout, "all", lgs[0], nullptr, make.c_str(), mf,
diff --git a/Source/cmGhsMultiTargetGenerator.cxx b/Source/cmGhsMultiTargetGenerator.cxx
index 3562e7e..08441a8 100644
--- a/Source/cmGhsMultiTargetGenerator.cxx
+++ b/Source/cmGhsMultiTargetGenerator.cxx
@@ -447,7 +447,7 @@
       cmSystemTools::IsOn(
         this->GeneratorTarget->GetProperty("GHS_NO_SOURCE_GROUP_FILE")) ||
       cmSystemTools::IsOn(
-        this->Makefile->GetDefinition("GHS_NO_SOURCE_GROUP_FILE"));
+        this->Makefile->GetDefinition("CMAKE_GHS_NO_SOURCE_GROUP_FILE"));
     if (useProjectFile || sg.empty()) {
       fout = &fout_proj;
     } else {
diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index e56dc4c..8e7ca12 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -682,8 +682,9 @@
         std::string compilerEnv = "CMAKE_";
         compilerEnv += lang;
         compilerEnv += "_COMPILER_ENV_VAR";
-        std::string envVar = mf->GetRequiredDefinition(compilerEnv);
-        std::string envVarValue = mf->GetRequiredDefinition(compilerName);
+        const std::string& envVar = mf->GetRequiredDefinition(compilerEnv);
+        const std::string& envVarValue =
+          mf->GetRequiredDefinition(compilerName);
         std::string env = envVar;
         env += "=";
         env += envVarValue;
diff --git a/Source/cmGlobalMSYSMakefileGenerator.cxx b/Source/cmGlobalMSYSMakefileGenerator.cxx
index 3c24556..606febe 100644
--- a/Source/cmGlobalMSYSMakefileGenerator.cxx
+++ b/Source/cmGlobalMSYSMakefileGenerator.cxx
@@ -45,7 +45,8 @@
   std::vector<std::string> const& l, cmMakefile* mf, bool optional)
 {
   this->FindMakeProgram(mf);
-  std::string makeProgram = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
+  const std::string& makeProgram =
+    mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
   std::vector<std::string> locations;
   std::string makeloc = cmSystemTools::GetProgramPath(makeProgram.c_str());
   locations.push_back(this->FindMinGW(makeloc));
diff --git a/Source/cmGlobalMinGWMakefileGenerator.cxx b/Source/cmGlobalMinGWMakefileGenerator.cxx
index c6d46e9..e218b4b 100644
--- a/Source/cmGlobalMinGWMakefileGenerator.cxx
+++ b/Source/cmGlobalMinGWMakefileGenerator.cxx
@@ -23,7 +23,8 @@
   std::vector<std::string> const& l, cmMakefile* mf, bool optional)
 {
   this->FindMakeProgram(mf);
-  std::string makeProgram = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
+  const std::string& makeProgram =
+    mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
   std::vector<std::string> locations;
   locations.push_back(cmSystemTools::GetProgramPath(makeProgram));
   locations.push_back("/mingw/bin");
diff --git a/Source/cmInstallTargetGenerator.cxx b/Source/cmInstallTargetGenerator.cxx
index 59701a1..5cee9d3 100644
--- a/Source/cmInstallTargetGenerator.cxx
+++ b/Source/cmInstallTargetGenerator.cxx
@@ -825,7 +825,7 @@
     return;
   }
 
-  std::string ranlib =
+  const std::string& ranlib =
     this->Target->Target->GetMakefile()->GetRequiredDefinition("CMAKE_RANLIB");
   if (ranlib.empty()) {
     return;
diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index 938098d..ba3c574 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -1364,9 +1364,9 @@
 
   std::string linkLanguage = cli.GetLinkLanguage();
 
-  std::string libPathFlag =
+  const std::string& libPathFlag =
     this->Makefile->GetRequiredDefinition("CMAKE_LIBRARY_PATH_FLAG");
-  std::string libPathTerminator =
+  const std::string& libPathTerminator =
     this->Makefile->GetSafeDefinition("CMAKE_LIBRARY_PATH_TERMINATOR");
 
   // Add standard libraries for this language.
diff --git a/Source/cmLocalVisualStudio7Generator.cxx b/Source/cmLocalVisualStudio7Generator.cxx
index 7c67192..b809be4 100644
--- a/Source/cmLocalVisualStudio7Generator.cxx
+++ b/Source/cmLocalVisualStudio7Generator.cxx
@@ -927,7 +927,7 @@
   std::string extraLinkOptionsBuildTypeDef =
     rootLinkerFlags + "_" + configTypeUpper;
 
-  std::string extraLinkOptionsBuildType =
+  const std::string& extraLinkOptionsBuildType =
     this->Makefile->GetRequiredDefinition(extraLinkOptionsBuildTypeDef);
 
   return extraLinkOptionsBuildType;
@@ -943,21 +943,18 @@
   std::string extraLinkOptions;
   if (target->GetType() == cmStateEnums::EXECUTABLE) {
     extraLinkOptions =
-      this->Makefile->GetRequiredDefinition("CMAKE_EXE_LINKER_FLAGS") +
-      std::string(" ") +
+      this->Makefile->GetRequiredDefinition("CMAKE_EXE_LINKER_FLAGS") + " " +
       GetBuildTypeLinkerFlags("CMAKE_EXE_LINKER_FLAGS", configName);
   }
   if (target->GetType() == cmStateEnums::SHARED_LIBRARY) {
     extraLinkOptions =
       this->Makefile->GetRequiredDefinition("CMAKE_SHARED_LINKER_FLAGS") +
-      std::string(" ") +
-      GetBuildTypeLinkerFlags("CMAKE_SHARED_LINKER_FLAGS", configName);
+      " " + GetBuildTypeLinkerFlags("CMAKE_SHARED_LINKER_FLAGS", configName);
   }
   if (target->GetType() == cmStateEnums::MODULE_LIBRARY) {
     extraLinkOptions =
       this->Makefile->GetRequiredDefinition("CMAKE_MODULE_LINKER_FLAGS") +
-      std::string(" ") +
-      GetBuildTypeLinkerFlags("CMAKE_MODULE_LINKER_FLAGS", configName);
+      " " + GetBuildTypeLinkerFlags("CMAKE_MODULE_LINKER_FLAGS", configName);
   }
 
   const char* targetLinkFlags = target->GetProperty("LINK_FLAGS");
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 3d22f57..f246da2 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -1984,7 +1984,9 @@
   // over changes in CMakeLists.txt, making the information stale and
   // hence useless.
   target->ClearDependencyInformation(*this);
-  if (excludeFromAll || this->GetPropertyAsBool("EXCLUDE_FROM_ALL")) {
+  if (excludeFromAll ||
+      (type != cmStateEnums::INTERFACE_LIBRARY &&
+       this->GetPropertyAsBool("EXCLUDE_FROM_ALL"))) {
     target->SetProperty("EXCLUDE_FROM_ALL", "TRUE");
   }
   target->AddSources(srcs);
@@ -2424,16 +2426,18 @@
     cmSystemTools::SameFile(fileName, this->GetHomeOutputDirectory());
 }
 
-std::string cmMakefile::GetRequiredDefinition(const std::string& name) const
+const std::string& cmMakefile::GetRequiredDefinition(
+  const std::string& name) const
 {
-  const char* ret = this->GetDefinition(name);
-  if (!ret) {
+  static std::string const empty;
+  const std::string* def = GetDef(name);
+  if (!def) {
     cmSystemTools::Error("Error required internal CMake variable not "
                          "set, cmake may not be built correctly.\n",
                          "Missing variable is:\n", name.c_str());
-    return std::string();
+    return empty;
   }
-  return std::string(ret);
+  return *def;
 }
 
 bool cmMakefile::IsDefinitionSet(const std::string& name) const
diff --git a/Source/cmMakefile.h b/Source/cmMakefile.h
index 70a5689..fce90f2 100644
--- a/Source/cmMakefile.h
+++ b/Source/cmMakefile.h
@@ -436,7 +436,7 @@
   const char* GetDefinition(const std::string&) const;
   const std::string* GetDef(const std::string&) const;
   const std::string& GetSafeDefinition(const std::string&) const;
-  std::string GetRequiredDefinition(const std::string& name) const;
+  const std::string& GetRequiredDefinition(const std::string& name) const;
   bool IsDefinitionSet(const std::string&) const;
   /**
    * Get the list of all variables in the current space. If argument
diff --git a/Source/cmMakefileTargetGenerator.cxx b/Source/cmMakefileTargetGenerator.cxx
index 9372ed5..cb595fd 100644
--- a/Source/cmMakefileTargetGenerator.cxx
+++ b/Source/cmMakefileTargetGenerator.cxx
@@ -654,19 +654,20 @@
       std::string cmdVar;
       if (this->GeneratorTarget->GetPropertyAsBool(
             "CUDA_SEPARABLE_COMPILATION")) {
-        cmdVar = std::string("CMAKE_CUDA_COMPILE_SEPARABLE_COMPILATION");
+        cmdVar = "CMAKE_CUDA_COMPILE_SEPARABLE_COMPILATION";
       } else if (this->GeneratorTarget->GetPropertyAsBool(
                    "CUDA_PTX_COMPILATION")) {
-        cmdVar = std::string("CMAKE_CUDA_COMPILE_PTX_COMPILATION");
+        cmdVar = "CMAKE_CUDA_COMPILE_PTX_COMPILATION";
       } else {
-        cmdVar = std::string("CMAKE_CUDA_COMPILE_WHOLE_COMPILATION");
+        cmdVar = "CMAKE_CUDA_COMPILE_WHOLE_COMPILATION";
       }
-      std::string compileRule = this->Makefile->GetRequiredDefinition(cmdVar);
+      const std::string& compileRule =
+        this->Makefile->GetRequiredDefinition(cmdVar);
       cmSystemTools::ExpandListArgument(compileRule, compileCommands);
     } else {
-      const std::string cmdVar =
-        std::string("CMAKE_") + lang + "_COMPILE_OBJECT";
-      std::string compileRule = this->Makefile->GetRequiredDefinition(cmdVar);
+      const std::string cmdVar = "CMAKE_" + lang + "_COMPILE_OBJECT";
+      const std::string& compileRule =
+        this->Makefile->GetRequiredDefinition(cmdVar);
       cmSystemTools::ExpandListArgument(compileRule, compileCommands);
     }
 
diff --git a/Source/cmNinjaTargetGenerator.cxx b/Source/cmNinjaTargetGenerator.cxx
index 5d76dc2..b525dac 100644
--- a/Source/cmNinjaTargetGenerator.cxx
+++ b/Source/cmNinjaTargetGenerator.cxx
@@ -493,7 +493,7 @@
   if (explicitPP) {
     // Lookup the explicit preprocessing rule.
     std::string const ppVar = "CMAKE_" + lang + "_PREPROCESS_SOURCE";
-    std::string const ppCmd =
+    std::string const& ppCmd =
       this->GetMakefile()->GetRequiredDefinition(ppVar);
 
     // Explicit preprocessing always uses a depfile.
@@ -671,19 +671,18 @@
     std::string cmdVar;
     if (this->GeneratorTarget->GetPropertyAsBool(
           "CUDA_SEPARABLE_COMPILATION")) {
-      cmdVar = std::string("CMAKE_CUDA_COMPILE_SEPARABLE_COMPILATION");
+      cmdVar = "CMAKE_CUDA_COMPILE_SEPARABLE_COMPILATION";
     } else if (this->GeneratorTarget->GetPropertyAsBool(
                  "CUDA_PTX_COMPILATION")) {
-      cmdVar = std::string("CMAKE_CUDA_COMPILE_PTX_COMPILATION");
+      cmdVar = "CMAKE_CUDA_COMPILE_PTX_COMPILATION";
     } else {
-      cmdVar = std::string("CMAKE_CUDA_COMPILE_WHOLE_COMPILATION");
+      cmdVar = "CMAKE_CUDA_COMPILE_WHOLE_COMPILATION";
     }
-    std::string compileCmd = mf->GetRequiredDefinition(cmdVar);
+    const std::string& compileCmd = mf->GetRequiredDefinition(cmdVar);
     cmSystemTools::ExpandListArgument(compileCmd, compileCmds);
   } else {
-    const std::string cmdVar =
-      std::string("CMAKE_") + lang + "_COMPILE_OBJECT";
-    std::string compileCmd = mf->GetRequiredDefinition(cmdVar);
+    const std::string cmdVar = "CMAKE_" + lang + "_COMPILE_OBJECT";
+    const std::string& compileCmd = mf->GetRequiredDefinition(cmdVar);
     cmSystemTools::ExpandListArgument(compileCmd, compileCmds);
   }
 
@@ -1213,20 +1212,19 @@
     std::string cmdVar;
     if (this->GeneratorTarget->GetPropertyAsBool(
           "CUDA_SEPARABLE_COMPILATION")) {
-      cmdVar = std::string("CMAKE_CUDA_COMPILE_SEPARABLE_COMPILATION");
+      cmdVar = "CMAKE_CUDA_COMPILE_SEPARABLE_COMPILATION";
     } else if (this->GeneratorTarget->GetPropertyAsBool(
                  "CUDA_PTX_COMPILATION")) {
-      cmdVar = std::string("CMAKE_CUDA_COMPILE_PTX_COMPILATION");
+      cmdVar = "CMAKE_CUDA_COMPILE_PTX_COMPILATION";
     } else {
-      cmdVar = std::string("CMAKE_CUDA_COMPILE_WHOLE_COMPILATION");
+      cmdVar = "CMAKE_CUDA_COMPILE_WHOLE_COMPILATION";
     }
-    std::string compileCmd =
+    const std::string& compileCmd =
       this->GetMakefile()->GetRequiredDefinition(cmdVar);
     cmSystemTools::ExpandListArgument(compileCmd, compileCmds);
   } else {
-    const std::string cmdVar =
-      std::string("CMAKE_") + language + "_COMPILE_OBJECT";
-    std::string compileCmd =
+    const std::string cmdVar = "CMAKE_" + language + "_COMPILE_OBJECT";
+    const std::string& compileCmd =
       this->GetMakefile()->GetRequiredDefinition(cmdVar);
     cmSystemTools::ExpandListArgument(compileCmd, compileCmds);
   }
diff --git a/Source/cmParseArgumentsCommand.cxx b/Source/cmParseArgumentsCommand.cxx
index 796974c..6231aab 100644
--- a/Source/cmParseArgumentsCommand.cxx
+++ b/Source/cmParseArgumentsCommand.cxx
@@ -14,7 +14,7 @@
 
 class cmExecutionStatus;
 
-static std::string escape_arg(const std::string& arg)
+static std::string EscapeArg(const std::string& arg)
 {
   // replace ";" with "\;" so output argument lists will split correctly
   std::string escapedArg;
@@ -27,6 +27,81 @@
   return escapedArg;
 }
 
+namespace {
+enum insideValues
+{
+  NONE,
+  SINGLE,
+  MULTI
+};
+
+typedef std::map<std::string, bool> options_map;
+typedef std::map<std::string, std::string> single_map;
+typedef std::map<std::string, std::vector<std::string>> multi_map;
+typedef std::set<std::string> options_set;
+}
+
+// function to be called every time, a new key word was parsed or all
+// parameters where parsed.
+static void DetectKeywordsMissingValues(insideValues currentState,
+                                        const std::string& currentArgName,
+                                        int& argumentsFound,
+                                        options_set& keywordsMissingValues)
+{
+  if (currentState == SINGLE ||
+      (currentState == MULTI && argumentsFound == 0)) {
+    keywordsMissingValues.insert(currentArgName);
+  }
+
+  argumentsFound = 0;
+}
+
+static void PassParsedArguments(const std::string& prefix,
+                                cmMakefile& makefile,
+                                const options_map& options,
+                                const single_map& singleValArgs,
+                                const multi_map& multiValArgs,
+                                const std::vector<std::string>& unparsed,
+                                const options_set& keywordsMissingValues)
+{
+  for (auto const& iter : options) {
+    makefile.AddDefinition(prefix + iter.first,
+                           iter.second ? "TRUE" : "FALSE");
+  }
+
+  for (auto const& iter : singleValArgs) {
+    if (!iter.second.empty()) {
+      makefile.AddDefinition(prefix + iter.first, iter.second.c_str());
+    } else {
+      makefile.RemoveDefinition(prefix + iter.first);
+    }
+  }
+
+  for (auto const& iter : multiValArgs) {
+    if (!iter.second.empty()) {
+      makefile.AddDefinition(prefix + iter.first,
+                             cmJoin(cmMakeRange(iter.second), ";").c_str());
+    } else {
+      makefile.RemoveDefinition(prefix + iter.first);
+    }
+  }
+
+  if (!unparsed.empty()) {
+    makefile.AddDefinition(prefix + "UNPARSED_ARGUMENTS",
+                           cmJoin(cmMakeRange(unparsed), ";").c_str());
+  } else {
+    makefile.RemoveDefinition(prefix + "UNPARSED_ARGUMENTS");
+  }
+
+  if (!keywordsMissingValues.empty()) {
+    makefile.AddDefinition(
+      prefix + "KEYWORDS_MISSING_VALUES",
+      cmJoin(cmMakeRange(keywordsMissingValues), ";").c_str());
+  } else {
+    makefile.RemoveDefinition(prefix + "KEYWORDS_MISSING_VALUES");
+  }
+}
+
 bool cmParseArgumentsCommand::InitialPass(std::vector<std::string> const& args,
                                           cmExecutionStatus&)
 {
@@ -67,9 +142,6 @@
 
   // define the result maps holding key/value pairs for
   // options, single values and multi values
-  typedef std::map<std::string, bool> options_map;
-  typedef std::map<std::string, std::string> single_map;
-  typedef std::map<std::string, std::vector<std::string>> multi_map;
   options_map options;
   single_map singleValArgs;
   multi_map multiValArgs;
@@ -114,12 +186,7 @@
     multiValArgs[iter]; // default initialize
   }
 
-  enum insideValues
-  {
-    NONE,
-    SINGLE,
-    MULTI
-  } insideValues = NONE;
+  insideValues insideValues = NONE;
   std::string currentArgName;
 
   list.clear();
@@ -155,10 +222,15 @@
     }
   }
 
+  options_set keywordsMissingValues;
+  int multiArgumentsFound = 0;
+
   // iterate over the arguments list and fill in the values where applicable
   for (std::string const& arg : list) {
     const options_map::iterator optIter = options.find(arg);
     if (optIter != options.end()) {
+      DetectKeywordsMissingValues(insideValues, currentArgName,
+                                  multiArgumentsFound, keywordsMissingValues);
       insideValues = NONE;
       optIter->second = true;
       continue;
@@ -166,6 +238,8 @@
 
     const single_map::iterator singleIter = singleValArgs.find(arg);
     if (singleIter != singleValArgs.end()) {
+      DetectKeywordsMissingValues(insideValues, currentArgName,
+                                  multiArgumentsFound, keywordsMissingValues);
       insideValues = SINGLE;
       currentArgName = arg;
       continue;
@@ -173,6 +247,8 @@
 
     const multi_map::iterator multiIter = multiValArgs.find(arg);
     if (multiIter != multiValArgs.end()) {
+      DetectKeywordsMissingValues(insideValues, currentArgName,
+                                  multiArgumentsFound, keywordsMissingValues);
       insideValues = MULTI;
       currentArgName = arg;
       continue;
@@ -184,15 +260,18 @@
         insideValues = NONE;
         break;
       case MULTI:
+        ++multiArgumentsFound;
         if (parseFromArgV) {
-          multiValArgs[currentArgName].push_back(escape_arg(arg));
+          multiValArgs[currentArgName].push_back(EscapeArg(arg));
         } else {
           multiValArgs[currentArgName].push_back(arg);
         }
         break;
       default:
+        multiArgumentsFound = 0;
+
         if (parseFromArgV) {
-          unparsed.push_back(escape_arg(arg));
+          unparsed.push_back(EscapeArg(arg));
         } else {
           unparsed.push_back(arg);
         }
@@ -200,36 +279,11 @@
     }
   }
 
-  // now iterate over the collected values and update their definition
-  // within the current scope. undefine if necessary.
+  DetectKeywordsMissingValues(insideValues, currentArgName,
+                              multiArgumentsFound, keywordsMissingValues);
 
-  for (auto const& iter : options) {
-    this->Makefile->AddDefinition(prefix + iter.first,
-                                  iter.second ? "TRUE" : "FALSE");
-  }
-  for (auto const& iter : singleValArgs) {
-    if (!iter.second.empty()) {
-      this->Makefile->AddDefinition(prefix + iter.first, iter.second.c_str());
-    } else {
-      this->Makefile->RemoveDefinition(prefix + iter.first);
-    }
-  }
-
-  for (auto const& iter : multiValArgs) {
-    if (!iter.second.empty()) {
-      this->Makefile->AddDefinition(
-        prefix + iter.first, cmJoin(cmMakeRange(iter.second), ";").c_str());
-    } else {
-      this->Makefile->RemoveDefinition(prefix + iter.first);
-    }
-  }
-
-  if (!unparsed.empty()) {
-    this->Makefile->AddDefinition(prefix + "UNPARSED_ARGUMENTS",
-                                  cmJoin(cmMakeRange(unparsed), ";").c_str());
-  } else {
-    this->Makefile->RemoveDefinition(prefix + "UNPARSED_ARGUMENTS");
-  }
+  PassParsedArguments(prefix, *this->Makefile, options, singleValArgs,
+                      multiValArgs, unparsed, keywordsMissingValues);
 
   return true;
 }
diff --git a/Source/cmServer.cxx b/Source/cmServer.cxx
index e740c05..719e6b1 100644
--- a/Source/cmServer.cxx
+++ b/Source/cmServer.cxx
@@ -97,7 +97,7 @@
   }
 
   cmSystemTools::SetMessageCallback(
-    [&request](const char* msg, const char* title) {
+    [&request](const std::string& msg, const char* title) {
       reportMessage(msg, title, request);
     });
 
@@ -165,15 +165,14 @@
   }
 }
 
-void cmServer::reportMessage(const char* msg, const char* title,
+void cmServer::reportMessage(const std::string& msg, const char* title,
                              const cmServerRequest& request)
 {
-  assert(msg);
   std::string titleString;
   if (title) {
     titleString = title;
   }
-  request.ReportMessage(std::string(msg), titleString);
+  request.ReportMessage(msg, titleString);
 }
 
 cmServerResponse cmServer::SetProtocolVersion(const cmServerRequest& request)
diff --git a/Source/cmServer.h b/Source/cmServer.h
index e1ed27a..3edc887 100644
--- a/Source/cmServer.h
+++ b/Source/cmServer.h
@@ -121,7 +121,7 @@
 private:
   static void reportProgress(const char* msg, float progress,
                              const cmServerRequest& request);
-  static void reportMessage(const char* msg, const char* title,
+  static void reportMessage(const std::string& msg, const char* title,
                             const cmServerRequest& request);
 
   // Handle requests:
diff --git a/Source/cmSiteNameCommand.cxx b/Source/cmSiteNameCommand.cxx
index 01758ee..9f041bc 100644
--- a/Source/cmSiteNameCommand.cxx
+++ b/Source/cmSiteNameCommand.cxx
@@ -52,9 +52,8 @@
   // try to find the hostname for this computer
   if (!cmSystemTools::IsOff(hostname_cmd)) {
     std::string host;
-    cmSystemTools::RunSingleCommand(hostname_cmd.c_str(), &host, nullptr,
-                                    nullptr, nullptr,
-                                    cmSystemTools::OUTPUT_NONE);
+    cmSystemTools::RunSingleCommand(hostname_cmd, &host, nullptr, nullptr,
+                                    nullptr, cmSystemTools::OUTPUT_NONE);
 
     // got the hostname
     if (!host.empty()) {
diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index aa4e3f9..2d7bce4 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -323,16 +323,16 @@
   }
 }
 
-void cmSystemTools::Message(const char* m1, const char* title)
+void cmSystemTools::Message(const std::string& m, const char* title)
 {
   if (s_DisableMessages) {
     return;
   }
   if (s_MessageCallback) {
-    s_MessageCallback(m1, title);
+    s_MessageCallback(m, title);
     return;
   }
-  std::cerr << m1 << std::endl << std::flush;
+  std::cerr << m << std::endl << std::flush;
 }
 
 void cmSystemTools::ReportLastSystemError(const char* msg)
@@ -866,7 +866,7 @@
   return result;
 }
 
-bool cmSystemTools::RunSingleCommand(const char* command,
+bool cmSystemTools::RunSingleCommand(const std::string& command,
                                      std::string* captureStdOut,
                                      std::string* captureStdErr, int* retVal,
                                      const char* dir, OutputOption outputflag,
@@ -876,7 +876,8 @@
     outputflag = OUTPUT_NONE;
   }
 
-  std::vector<std::string> args = cmSystemTools::ParseArguments(command);
+  std::vector<std::string> args =
+    cmSystemTools::ParseArguments(command.c_str());
 
   if (args.empty()) {
     return false;
diff --git a/Source/cmSystemTools.h b/Source/cmSystemTools.h
index 0f92fe2..88758a6 100644
--- a/Source/cmSystemTools.h
+++ b/Source/cmSystemTools.h
@@ -56,7 +56,7 @@
    */
   static std::string TrimWhitespace(const std::string& s);
 
-  using MessageCallback = std::function<void(const char*, const char*)>;
+  using MessageCallback = std::function<void(const std::string&, const char*)>;
   /**
    *  Set the function used by GUIs to display error messages
    *  Function gets passed: message as a const char*,
@@ -74,11 +74,7 @@
   /**
    * Display a message.
    */
-  static void Message(const char* m, const char* title = nullptr);
-  static void Message(const std::string& m, const char* title = nullptr)
-  {
-    Message(m.c_str(), title);
-  }
+  static void Message(const std::string& m, const char* title = nullptr);
 
   using OutputCallback = std::function<void(std::string const&)>;
 
@@ -224,7 +220,7 @@
     OUTPUT_FORWARD,
     OUTPUT_PASSTHROUGH
   };
-  static bool RunSingleCommand(const char* command,
+  static bool RunSingleCommand(const std::string& command,
                                std::string* captureStdOut = nullptr,
                                std::string* captureStdErr = nullptr,
                                int* retVal = nullptr,
diff --git a/Source/cmTryRunCommand.cxx b/Source/cmTryRunCommand.cxx
index 0f7323d..d863339 100644
--- a/Source/cmTryRunCommand.cxx
+++ b/Source/cmTryRunCommand.cxx
@@ -188,8 +188,8 @@
     finalCommand += runArgs;
   }
   bool worked = cmSystemTools::RunSingleCommand(
-    finalCommand.c_str(), out, out, &retVal, nullptr,
-    cmSystemTools::OUTPUT_NONE, cmDuration::zero());
+    finalCommand, out, out, &retVal, nullptr, cmSystemTools::OUTPUT_NONE,
+    cmDuration::zero());
   // set the run var
   char retChar[16];
   const char* retStr;
diff --git a/Source/cmUtilitySourceCommand.cxx b/Source/cmUtilitySourceCommand.cxx
index 231bca4..b59a587 100644
--- a/Source/cmUtilitySourceCommand.cxx
+++ b/Source/cmUtilitySourceCommand.cxx
@@ -79,7 +79,7 @@
   }
 
   // The source exists.
-  std::string cmakeCFGout =
+  const std::string& cmakeCFGout =
     this->Makefile->GetRequiredDefinition("CMAKE_CFG_INTDIR");
   std::string utilityDirectory = this->Makefile->GetCurrentBinaryDirectory();
   std::string exePath;
diff --git a/Source/cmakemain.cxx b/Source/cmakemain.cxx
index 890b74e..a49246b 100644
--- a/Source/cmakemain.cxx
+++ b/Source/cmakemain.cxx
@@ -142,8 +142,8 @@
   return msg;
 }
 
-static void cmakemainMessageCallback(const char* m, const char* /*unused*/,
-                                     cmake* cm)
+static void cmakemainMessageCallback(const std::string& m,
+                                     const char* /*unused*/, cmake* cm)
 {
   std::cerr << m << cmakemainGetStack(cm) << std::endl << std::flush;
 }
@@ -319,9 +319,10 @@
   cmake cm(role, mode);
   cm.SetHomeDirectory("");
   cm.SetHomeOutputDirectory("");
-  cmSystemTools::SetMessageCallback([&cm](const char* msg, const char* title) {
-    cmakemainMessageCallback(msg, title, &cm);
-  });
+  cmSystemTools::SetMessageCallback(
+    [&cm](const std::string& msg, const char* title) {
+      cmakemainMessageCallback(msg, title, &cm);
+    });
   cm.SetProgressCallback([&cm](const char* msg, float prog) {
     cmakemainProgressCallback(msg, prog, &cm);
   });
@@ -499,9 +500,10 @@
   }
 
   cmake cm(cmake::RoleInternal, cmState::Unknown);
-  cmSystemTools::SetMessageCallback([&cm](const char* msg, const char* title) {
-    cmakemainMessageCallback(msg, title, &cm);
-  });
+  cmSystemTools::SetMessageCallback(
+    [&cm](const std::string& msg, const char* title) {
+      cmakemainMessageCallback(msg, title, &cm);
+    });
   cm.SetProgressCallback([&cm](const char* msg, float prog) {
     cmakemainProgressCallback(msg, prog, &cm);
   });
@@ -541,9 +543,10 @@
   }
 
   cmake cm(cmake::RoleInternal, cmState::Unknown);
-  cmSystemTools::SetMessageCallback([&cm](const char* msg, const char* title) {
-    cmakemainMessageCallback(msg, title, &cm);
-  });
+  cmSystemTools::SetMessageCallback(
+    [&cm](const std::string& msg, const char* title) {
+      cmakemainMessageCallback(msg, title, &cm);
+    });
   cm.SetProgressCallback([&cm](const char* msg, float prog) {
     cmakemainProgressCallback(msg, prog, &cm);
   });
diff --git a/Source/cmcmd.cxx b/Source/cmcmd.cxx
index d20c5d2..4415ba6 100644
--- a/Source/cmcmd.cxx
+++ b/Source/cmcmd.cxx
@@ -826,7 +826,7 @@
         cmWrap('"', cmMakeRange(args).advance(3), '"', " ");
       int retval = 0;
       if (cmSystemTools::RunSingleCommand(
-            command.c_str(), nullptr, nullptr, &retval, directory.c_str(),
+            command, nullptr, nullptr, &retval, directory.c_str(),
             cmSystemTools::OUTPUT_PASSTHROUGH, cmDuration::zero())) {
         return retval;
       }
diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index 8094c40..e8e5a2c 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -2372,7 +2372,7 @@
       add_test_GhsMulti_rename_install(EXEC_AND_LIB)
       add_test_GhsMulti(multiple_source_groups GhsMultiSrcGroups Default "")
       add_test_GhsMulti(multiple_source_groups_folders GhsMultiSrcGroups PropFolders "-DTEST_PROP=ON")
-      add_test_GhsMulti(multiple_source_groups_all_folders GhsMultiSrcGroups AllFolders "-DGHS_NO_SOURCE_GROUP_FILE=ON")
+      add_test_GhsMulti(multiple_source_groups_all_folders GhsMultiSrcGroups AllFolders "-DCMAKE_GHS_NO_SOURCE_GROUP_FILE=ON")
       add_test_GhsMulti(unsupported_targets GhsMultiUnsupportedTargets "" "")
       add_test_GhsMulti(object_library GhsMultiObjectLibrary "" "")
       add_test_GhsMulti(exclude GhsMultiExclude "" ""
diff --git a/Tests/InterfaceLibrary/CMakeLists.txt b/Tests/InterfaceLibrary/CMakeLists.txt
index 6aae09a..954c02d 100644
--- a/Tests/InterfaceLibrary/CMakeLists.txt
+++ b/Tests/InterfaceLibrary/CMakeLists.txt
@@ -47,6 +47,7 @@
 add_dependencies(InterfaceLibrary item_fake_tgt)
 
 add_subdirectory(libsdir)
+add_subdirectory(excluded EXCLUDE_FROM_ALL)
 
 add_executable(sharedlibtestexe sharedlibtestexe.cpp)
 target_link_libraries(sharedlibtestexe shared_iface imported::iface)
diff --git a/Tests/InterfaceLibrary/excluded/CMakeLists.txt b/Tests/InterfaceLibrary/excluded/CMakeLists.txt
new file mode 100644
index 0000000..69a6807
--- /dev/null
+++ b/Tests/InterfaceLibrary/excluded/CMakeLists.txt
@@ -0,0 +1 @@
+add_library(excluded_iface INTERFACE)
diff --git a/Tests/RunCMake/cmake_parse_arguments/KeyWordsMissingValues.cmake b/Tests/RunCMake/cmake_parse_arguments/KeyWordsMissingValues.cmake
new file mode 100644
index 0000000..561f9c0
--- /dev/null
+++ b/Tests/RunCMake/cmake_parse_arguments/KeyWordsMissingValues.cmake
@@ -0,0 +1,133 @@
+include(${CMAKE_CURRENT_LIST_DIR}/test_utils.cmake)
+
+# No keywords that miss any values, _KEYWORDS_MISSING_VALUES should not be defined
+cmake_parse_arguments(PREF "" "P1" "P2" P1 p1 P2 p2_a p2_b)
+
+TEST(PREF_KEYWORDS_MISSING_VALUES "UNDEFINED")
+
+# Keyword should even be deleted from the actual scope
+set(PREF_KEYWORDS_MISSING_VALUES "What ever")
+cmake_parse_arguments(PREF "" "" "")
+
+TEST(PREF_KEYWORDS_MISSING_VALUES "UNDEFINED")
+
+# Given missing keywords as only option
+cmake_parse_arguments(PREF "" "P1" "P2" P1)
+
+TEST(PREF_KEYWORDS_MISSING_VALUES "P1")
+TEST(PREF_P1 "UNDEFINED")
+TEST(PREF_UNPARSED_ARGUMENTS "UNDEFINED")
+
+# Mixed with unparsed arguments
+cmake_parse_arguments(UPREF "" "P1" "P2" A B P2 C P1)
+TEST(UPREF_KEYWORDS_MISSING_VALUES "P1")
+TEST(UPREF_UNPARSED_ARGUMENTS A B)
+
+# one_value_keyword followed by option
+cmake_parse_arguments(REF "OP" "P1" "" P1 OP)
+TEST(REF_KEYWORDS_MISSING_VALUES "P1")
+TEST(REF_UNPARSED_ARGUMENTS "UNDEFINED")
+TEST(REF_OP "TRUE")
+
+# Counter Test
+cmake_parse_arguments(REF "OP" "P1" "" P1 p1 OP)
+TEST(REF_KEYWORDS_MISSING_VALUES "UNDEFINED")
+TEST(REF_P1 "p1")
+TEST(REF_UNPARSED_ARGUMENTS "UNDEFINED")
+TEST(REF_OP "TRUE")
+
+# one_value_keyword followed by a one_value_keyword
+cmake_parse_arguments(REF "" "P1;P2" "" P1 P2 p2)
+TEST(REF_KEYWORDS_MISSING_VALUES "P1")
+TEST(REF_P1 "UNDEFINED")
+TEST(REF_UNPARSED_ARGUMENTS "UNDEFINED")
+TEST(REF_P2 "p2")
+
+# Counter Test
+cmake_parse_arguments(REF "" "P1;P2" "" P1 p1 P2 p2)
+TEST(REF_KEYWORDS_MISSING_VALUES "UNDEFINED")
+TEST(REF_P1 "p1")
+TEST(REF_UNPARSED_ARGUMENTS "UNDEFINED")
+TEST(REF_P2 "p2")
+
+# one_value_keyword followed by a multi_value_keywords
+cmake_parse_arguments(REF "" "P1" "P2" P1 P2 p1 p2)
+TEST(REF_KEYWORDS_MISSING_VALUES "P1")
+TEST(REF_P1 "UNDEFINED")
+TEST(REF_UNPARSED_ARGUMENTS "UNDEFINED")
+TEST(REF_P2 p1 p2)
+
+# Counter Examples
+cmake_parse_arguments(REF "" "P1" "P2" P1 p1 P2 p1 p2)
+TEST(REF_KEYWORDS_MISSING_VALUES "UNDEFINED")
+TEST(REF_P1 "p1")
+TEST(REF_UNPARSED_ARGUMENTS "UNDEFINED")
+TEST(REF_P2 p1 p2)
+
+# multi_value_keywords as only option
+cmake_parse_arguments(REF "" "P1" "P2" P2)
+TEST(REF_KEYWORDS_MISSING_VALUES "P2")
+TEST(REF_P1 "UNDEFINED")
+TEST(REF_UNPARSED_ARGUMENTS "UNDEFINED")
+TEST(REF_P2 "UNDEFINED")
+
+# multi_value_keywords followed by option
+cmake_parse_arguments(REF "O1" "" "P1" P1 O1)
+TEST(REF_KEYWORDS_MISSING_VALUES "P1")
+TEST(REF_P1 "UNDEFINED")
+TEST(REF_UNPARSED_ARGUMENTS "UNDEFINED")
+TEST(REF_O1 "TRUE")
+
+# counter test
+cmake_parse_arguments(REF "O1" "" "P1" P1 p1 p2 O1)
+TEST(REF_KEYWORDS_MISSING_VALUES "UNDEFINED")
+TEST(REF_P1 "p1;p2")
+TEST(REF_UNPARSED_ARGUMENTS "UNDEFINED")
+TEST(REF_O1 "TRUE")
+
+# multi_value_keywords followed by one_value_keyword
+cmake_parse_arguments(REF "" "P1" "P2" P2 P1 p1)
+TEST(REF_KEYWORDS_MISSING_VALUES "P2")
+TEST(REF_P1 "p1")
+TEST(REF_UNPARSED_ARGUMENTS "UNDEFINED")
+TEST(REF_P2 "UNDEFINED")
+
+# counter test
+cmake_parse_arguments(REF "" "P1" "P2" P2 p2 P1 p1)
+TEST(REF_KEYWORDS_MISSING_VALUES "UNDEFINED")
+TEST(REF_P1 "p1")
+TEST(REF_UNPARSED_ARGUMENTS "UNDEFINED")
+TEST(REF_P2 "p2")
+
+# one_value_keyword as last argument
+cmake_parse_arguments(REF "" "P1" "P2" A P2 p2 P1)
+TEST(REF_KEYWORDS_MISSING_VALUES "P1")
+TEST(REF_P1 "UNDEFINED")
+TEST(REF_UNPARSED_ARGUMENTS "A")
+TEST(REF_P2 "p2")
+
+# multi_value_keywords as last argument
+cmake_parse_arguments(REF "" "P1" "P2" P1 p1 P2)
+TEST(REF_KEYWORDS_MISSING_VALUES "P2")
+TEST(REF_P1 "p1")
+TEST(REF_P2 "UNDEFINED")
+
+# Multiple one_value_keyword and multi_value_keywords at different places
+cmake_parse_arguments(REF "O1;O2" "P1" "P2" P1 O1 P2 O2)
+TEST(REF_KEYWORDS_MISSING_VALUES P1 P2)
+TEST(REF_P1 "UNDEFINED")
+TEST(REF_P2 "UNDEFINED")
+
+# Duplicated missing keywords
+cmake_parse_arguments(REF "O1;O2" "P1" "P2" P1 O1 P2 O2 P1 P2)
+TEST(REF_KEYWORDS_MISSING_VALUES P1 P2)
+TEST(REF_P1 "UNDEFINED")
+TEST(REF_P2 "UNDEFINED")
+
+# make sure keywords that are never used, don't get added to KEYWORDS_MISSING_VALUES
+cmake_parse_arguments(REF "O1;O2" "P1" "P2")
+TEST(REF_KEYWORDS_MISSING_VALUES "UNDEFINED")
+TEST(REF_O1 FALSE)
+TEST(REF_O2 FALSE)
+TEST(REF_P1 UNDEFINED)
+TEST(REF_P2 UNDEFINED)
diff --git a/Tests/RunCMake/cmake_parse_arguments/RunCMakeTest.cmake b/Tests/RunCMake/cmake_parse_arguments/RunCMakeTest.cmake
index 1e15b3b..505840d 100644
--- a/Tests/RunCMake/cmake_parse_arguments/RunCMakeTest.cmake
+++ b/Tests/RunCMake/cmake_parse_arguments/RunCMakeTest.cmake
@@ -11,3 +11,4 @@
 run_cmake(BadArgvN3)
 run_cmake(BadArgvN4)
 run_cmake(CornerCasesArgvN)
+run_cmake(KeyWordsMissingValues)