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Brad King
48aac247e9
This change was originally made by commit74b1c9fc8e(Explicitly specify language flag when source LANGUAGE property is set, 2020-06-01, v3.19.0-rc1~722^2), but it was reverted by commit30aa715fac(Revert "specify language flag when source LANGUAGE property is set", 2020-11-19) to restore compatibility with pre-3.19 behavior. Implement the change again, but add policy CMP0119 to make this change while preserving compatibility with existing projects. Note that the `Compiler/{Clang,Intel,MSVC}-CXX` modules do not need to specify `-TP` for their MSVC-like variants because we already use the flag in `CMAKE_CXX_COMPILE_OBJECT`. Similarly for `Compiler/XL-CXX` and `Platform/Windows-Embarcadero`. Note also that this does not seem possible to implement for XL C. Even with `-qsourcetype=c`, `xlc` complains about an unknown suffix: `1501-218 (W) file /.../AltExtC.zzz contains an incorrect file suffix`. It returns non-zero even with `-qsuppress=1501-218`. Co-Author: Robert Maynard <robert.maynard@kitware.com> Fixes: #14516, #20716
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746 B
ReStructuredText
18 lines
746 B
ReStructuredText
LANGUAGE
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--------
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Specify the programming language in which a source file is written.
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A property that can be set to indicate what programming language the
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source file is. If it is not set the language is determined based on
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the file extension. Typical values are ``CXX`` (i.e. C++), ``C``,
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``CSharp``, ``CUDA``, ``Fortran``, ``ISPC``, and ``ASM``. Setting this
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property for a file means this file will be compiled. Do not set this
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for headers or files that should not be compiled.
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.. versionchanged:: 3.20
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Setting this property causes the source file to be compiled as the
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specified language, using explicit flags if possible. Previously it
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only caused the specified language's compiler to be used.
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See policy :policy:`CMP0119`.
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