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Languages: Add support for Objective-C++

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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>
This commit is contained in:
Steve Wilson
2019-09-13 18:12:15 +01:00
committed by Cristian Adam
parent 80f120a85f
commit 9e66397c28
39 changed files with 1453 additions and 32 deletions
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5
Help/command/enable_language.rst
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@@ -1,7 +1,6 @@
enable_language
---------------
Enable a language (CXX/C/OBJC/Fortran/etc)
Enable a language (CXX/C/OBJC/OBJCXX/Fortran/etc)
.. code-block:: cmake
@@ -10,7 +9,7 @@ Enable a language (CXX/C/OBJC/Fortran/etc)
Enables support for the named language in CMake. This is
the same as the :command:`project` command but does not create any of the extra
variables that are created by the project command. Example languages
are ``CXX``, ``C``, ``CUDA``, ``OBJC``, ``Fortran``, and ``ASM``.
are ``CXX``, ``C``, ``CUDA``, ``OBJC``, ``OBJCXX``, ``Fortran``, and ``ASM``.
If enabling ``ASM``, enable it last so that CMake can check whether
compilers for other languages like ``C`` work for assembly too.