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This change was originally made by commit74b1c9fc8e(Explicitly specify language flag when source LANGUAGE property is set, 2020-06-01, v3.19.0-rc1~722^2), but it was reverted by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
66 lines
2.5 KiB
CMake
66 lines
2.5 KiB
CMake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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include(Compiler/CMakeCommonCompilerMacros)
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if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 19.27)
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set(CMAKE_C90_STANDARD_COMPILE_OPTION "")
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set(CMAKE_C90_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_C99_STANDARD_COMPILE_OPTION "")
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set(CMAKE_C99_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std:c11")
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set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std:c11")
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__compiler_check_default_language_standard(C 19.27 99)
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else()
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# MSVC has no specific options to set C language standards, but set them as
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# empty strings anyways so the feature test infrastructure can at least check
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# to see if they are defined.
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set(CMAKE_C90_STANDARD_COMPILE_OPTION "")
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set(CMAKE_C90_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_C99_STANDARD_COMPILE_OPTION "")
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set(CMAKE_C99_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_C11_STANDARD_COMPILE_OPTION "")
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set(CMAKE_C11_EXTENSION_COMPILE_OPTION "")
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# There is no meaningful default for this
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set(CMAKE_C_STANDARD_DEFAULT "")
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endif()
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set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -TC)
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set(CMAKE_C_CLANG_TIDY_DRIVER_MODE "cl")
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# There are no C compiler modes so we hard-code the known compiler supported
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# features. Override the default macro for this special case. Pretend that
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# all language standards are available so that at least compilation
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# can be attempted.
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macro(cmake_record_c_compile_features)
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list(APPEND CMAKE_C_COMPILE_FEATURES
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c_std_90
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c_std_99
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c_std_11
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c_function_prototypes
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)
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list(APPEND CMAKE_C90_COMPILE_FEATURES c_std_90 c_function_prototypes)
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list(APPEND CMAKE_C99_COMPILE_FEATURES c_std_99)
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list(APPEND CMAKE_C11_COMPILE_FEATURES c_std_11)
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if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 14.0)
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list(APPEND CMAKE_C_COMPILE_FEATURES c_variadic_macros)
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list(APPEND CMAKE_C99_COMPILE_FEATURES c_variadic_macros)
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endif()
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if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 19.27)
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list(APPEND CMAKE_C_COMPILE_FEATURES c_restrict)
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list(APPEND CMAKE_C99_COMPILE_FEATURES c_restrict)
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endif()
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if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 19.28)
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list(APPEND CMAKE_C_COMPILE_FEATURES c_static_assert)
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list(APPEND CMAKE_C11_COMPILE_FEATURES c_static_assert)
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endif()
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set(_result 0) # expected by cmake_determine_compile_features
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endmacro()
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# /JMC "Just My Code" is only supported by MSVC 19.05 onward.
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if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 19.05)
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set(CMAKE_C_COMPILE_OPTIONS_JMC "-JMC")
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endif()
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