Languages: Add support for Objective-C++

Add entries in Modules and Modules/Platform to support
Objective-C++ compiler determination and identification.
Add Modules to check Objective-C++ compiler flags, source
compilations, program checks, etc...

Use OBJCXX as the designator of the language, eg:

project(foo OBJCXX)

Add various tests for Objective-C++ language features.  Add
tests to preserve C++ handling of .M and .mm files when
Objective-C++ is not a configured language.

Co-authored-by: Cristian Adam <cristian.adam@gmail.com>

1 files changed, 145 insertions, 0 deletions

diff --git a/Modules/CheckOBJCXXSourceRuns.cmake b/Modules/CheckOBJCXXSourceRuns.cmake
new file mode 100644
index 0000000000..a3d5923e9f
--- /dev/null
+++ b/Modules/CheckOBJCXXSourceRuns.cmake
@@ -0,0 +1,145 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+CheckOBJCXXSourceRuns
+---------------------
+
+Check if given Objective-C++ source compiles and links into an executable and can
+subsequently be run.
+
+.. command:: check_objcxx_source_runs
+
+  .. code-block:: cmake
+
+    check_objcxx_source_runs(<code> <resultVar>)
+
+  Check that the source supplied in ``<code>`` can be compiled as a Objective-C++ source
+  file, linked as an executable and then run. The ``<code>`` must contain at
+  least a ``main()`` function. If the ``<code>`` could be built and run
+  successfully, the internal cache variable specified by ``<resultVar>`` will
+  be set to 1, otherwise it will be set to an value that evaluates to boolean
+  false (e.g. an empty string or an error message).
+
+  The underlying check is performed by the :command:`try_run` command. The
+  compile and link commands can be influenced by setting any of the following
+  variables prior to calling ``check_objcxx_source_runs()``:
+
+  ``CMAKE_REQUIRED_FLAGS``
+    Additional flags to pass to the compiler. Note that the contents of
+    :variable:`CMAKE_OBJCXX_FLAGS <CMAKE_<LANG>_FLAGS>` and its associated
+    configuration-specific variable are automatically added to the compiler
+    command before the contents of ``CMAKE_REQUIRED_FLAGS``.
+
+  ``CMAKE_REQUIRED_DEFINITIONS``
+    A :ref:`;-list <CMake Language Lists>` of compiler definitions of the form
+    ``-DFOO`` or ``-DFOO=bar``. A definition for the name specified by
+    ``<resultVar>`` will also be added automatically.
+
+  ``CMAKE_REQUIRED_INCLUDES``
+    A :ref:`;-list <CMake Language Lists>` of header search paths to pass to
+    the compiler. These will be the only header search paths used by
+    ``try_run()``, i.e. the contents of the :prop_dir:`INCLUDE_DIRECTORIES`
+    directory property will be ignored.
+
+  ``CMAKE_REQUIRED_LINK_OPTIONS``
+    A :ref:`;-list <CMake Language Lists>` of options to add to the link
+    command (see :command:`try_run` for further details).
+
+  ``CMAKE_REQUIRED_LIBRARIES``
+    A :ref:`;-list <CMake Language Lists>` of libraries to add to the link
+    command. These can be the name of system libraries or they can be
+    :ref:`Imported Targets <Imported Targets>` (see :command:`try_run` for
+    further details).
+
+  ``CMAKE_REQUIRED_QUIET``
+    If this variable evaluates to a boolean true value, all status messages
+    associated with the check will be suppressed.
+
+  The check is only performed once, with the result cached in the variable
+  named by ``<resultVar>``. Every subsequent CMake run will re-use this cached
+  value rather than performing the check again, even if the ``<code>`` changes.
+  In order to force the check to be re-evaluated, the variable named by
+  ``<resultVar>`` must be manually removed from the cache.
+
+#]=======================================================================]
+
+include_guard(GLOBAL)
+
+macro(CHECK_OBJCXX_SOURCE_RUNS SOURCE VAR)
+  if(NOT DEFINED "${VAR}")
+    set(MACRO_CHECK_FUNCTION_DEFINITIONS
+      "-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
+    if(CMAKE_REQUIRED_LINK_OPTIONS)
+      set(CHECK_OBJCXX_SOURCE_COMPILES_ADD_LINK_OPTIONS
+        LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
+    else()
+      set(CHECK_OBJCXX_SOURCE_COMPILES_ADD_LINK_OPTIONS)
+    endif()
+    if(CMAKE_REQUIRED_LIBRARIES)
+      set(CHECK_OBJCXX_SOURCE_COMPILES_ADD_LIBRARIES
+        LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
+    else()
+      set(CHECK_OBJCXX_SOURCE_COMPILES_ADD_LIBRARIES)
+    endif()
+    if(CMAKE_REQUIRED_INCLUDES)
+      set(CHECK_OBJCXX_SOURCE_COMPILES_ADD_INCLUDES
+        "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
+    else()
+      set(CHECK_OBJCXX_SOURCE_COMPILES_ADD_INCLUDES)
+    endif()
+    file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.mm"
+      "${SOURCE}\n")
+
+    if(NOT CMAKE_REQUIRED_QUIET)
+      message(STATUS "Performing Test ${VAR}")
+    endif()
+    try_run(${VAR}_EXITCODE ${VAR}_COMPILED
+      ${CMAKE_BINARY_DIR}
+      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.mm
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
+      ${CHECK_OBJCXX_SOURCE_COMPILES_ADD_LINK_OPTIONS}
+      ${CHECK_OBJCXX_SOURCE_COMPILES_ADD_LIBRARIES}
+      CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
+      -DCMAKE_SKIP_RPATH:BOOL=${CMAKE_SKIP_RPATH}
+      "${CHECK_OBJCXX_SOURCE_COMPILES_ADD_INCLUDES}"
+      COMPILE_OUTPUT_VARIABLE OUTPUT
+      RUN_OUTPUT_VARIABLE RUN_OUTPUT)
+
+    # if it did not compile make the return value fail code of 1
+    if(NOT ${VAR}_COMPILED)
+      set(${VAR}_EXITCODE 1)
+    endif()
+    # if the return value was 0 then it worked
+    if("${${VAR}_EXITCODE}" EQUAL 0)
+      set(${VAR} 1 CACHE INTERNAL "Test ${VAR}")
+      if(NOT CMAKE_REQUIRED_QUIET)
+        message(STATUS "Performing Test ${VAR} - Success")
+      endif()
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+        "Performing Objective-C++ SOURCE FILE Test ${VAR} succeeded with the following output:\n"
+        "${OUTPUT}\n"
+        "...and run output:\n"
+        "${RUN_OUTPUT}\n"
+        "Return value: ${${VAR}}\n"
+        "Source file was:\n${SOURCE}\n")
+    else()
+      if(CMAKE_CROSSCOMPILING AND "${${VAR}_EXITCODE}" MATCHES  "FAILED_TO_RUN")
+        set(${VAR} "${${VAR}_EXITCODE}")
+      else()
+        set(${VAR} "" CACHE INTERNAL "Test ${VAR}")
+      endif()
+
+      if(NOT CMAKE_REQUIRED_QUIET)
+        message(STATUS "Performing Test ${VAR} - Failed")
+      endif()
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+        "Performing Objective-C++ SOURCE FILE Test ${VAR} failed with the following output:\n"
+        "${OUTPUT}\n"
+        "...and run output:\n"
+        "${RUN_OUTPUT}\n"
+        "Return value: ${${VAR}_EXITCODE}\n"
+        "Source file was:\n${SOURCE}\n")
+    endif()
+  endif()
+endmacro()