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Capture CMAKE_<LANG>_COMPILER_ARG1 from CMAKE_<LANG>_COMPILER in the
same fashion that it is from $ENV{<LANG>}.
Since get_filename_component() returns a single string of all the
arguments from $ENV{<LANG>}, a single string of arguments will be
constructed from the items contained in CMAKE_<LANG>_COMPILER.
Fixes #20089
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13ea190725 Help: Add 3.17.3 release note for Objective C/C++ compiler selection
16bf978e0c Merge branch 'backport-3.16-objc-env-vars' into objc-env-vars
67b9f55d46 Objective C/C++: Honor CC and CXX env vars to select compiler
ab9be6662f Help: Document OBJC and OBJCXX env vars for Objective C/C++ compilers
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !4746
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If the `OBJC` or `OBJCXX` environment variable is not set to specify an
Objective C or C++ compiler, check `CC` or `CXX` too.
Fixes: #20703
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Now detect _CMAKE_TOOLCHAIN_PREFIX whenever a compilers
name matches the heuristics, instead of only doing it
when cross compiling
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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>
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