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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This change was originally made by commit74b1c9fc8e(Explicitly specify language flag when source LANGUAGE property is set, 2020-06-01, v3.19.0-rc1~722^2), but it was reverted by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
32 lines
1.0 KiB
CMake
32 lines
1.0 KiB
CMake
include(Compiler/Clang)
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__compiler_clang(C)
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if(NOT "x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC")
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if((NOT DEFINED CMAKE_DEPENDS_USE_COMPILER OR CMAKE_DEPENDS_USE_COMPILER)
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AND CMAKE_GENERATOR MATCHES "Makefiles"
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AND CMAKE_DEPFILE_FLAGS_C)
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# dependencies are computed by the compiler itself
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set(CMAKE_C_DEPFILE_FORMAT gcc)
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set(CMAKE_C_DEPENDS_USE_COMPILER TRUE)
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endif()
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endif()
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set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -x c)
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if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.0)
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set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90")
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set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90")
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set(CMAKE_C90_STANDARD__HAS_FULL_SUPPORT ON)
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set(CMAKE_C99_STANDARD_COMPILE_OPTION "-std=c99")
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set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")
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set(CMAKE_C99_STANDARD__HAS_FULL_SUPPORT ON)
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set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c11")
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set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
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set(CMAKE_C11_STANDARD__HAS_FULL_SUPPORT ON)
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endif()
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__compiler_check_default_language_standard(C 4.0 99)
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