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9a720d96eb
Although there is no `cl -std:c23` flag, the underlying Clang compiler
does have a C23 mode we can activate by passing `-std=c23` through a
`clang-cl` wrapper flag.
Also port the fix from commit 30139913e9 (VS: Restore support for mixing
C++23 and C in one target with clang-cl, 2024-12-09, v3.31.3~10^2).
Fixes: #27038
Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Co-authored-by: Brad King <brad.king@kitware.com>
105 lines
3.8 KiB
CMake
105 lines
3.8 KiB
CMake
include(Compiler/Clang)
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__compiler_clang(C)
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if("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xMSVC")
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set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -TC)
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set(CMAKE_C_CLANG_TIDY_DRIVER_MODE "cl")
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set(CMAKE_C_INCLUDE_WHAT_YOU_USE_DRIVER_MODE "cl")
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if((NOT DEFINED CMAKE_DEPENDS_USE_COMPILER OR CMAKE_DEPENDS_USE_COMPILER)
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AND CMAKE_GENERATOR MATCHES "Makefiles|WMake"
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AND CMAKE_DEPFILE_FLAGS_C)
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set(CMAKE_C_DEPENDS_USE_COMPILER TRUE)
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endif()
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elseif("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU")
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set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -x c)
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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|WMake"
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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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if("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU")
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if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 2.1)
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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_C99_STANDARD_COMPILE_OPTION "-std=c99")
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set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")
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set(CMAKE_C_STANDARD_LATEST 99)
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endif()
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if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 3.1)
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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_C_STANDARD_LATEST 11)
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elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 3.0)
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set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c1x")
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set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu1x")
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set(CMAKE_C_STANDARD_LATEST 11)
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endif()
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if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 6.0)
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set(CMAKE_C17_STANDARD_COMPILE_OPTION "-std=c17")
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set(CMAKE_C17_EXTENSION_COMPILE_OPTION "-std=gnu17")
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set(CMAKE_C_STANDARD_LATEST 17)
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endif()
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if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 18.0)
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set(CMAKE_C23_STANDARD_COMPILE_OPTION "-std=c23")
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set(CMAKE_C23_EXTENSION_COMPILE_OPTION "-std=gnu23")
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set(CMAKE_C_STANDARD_LATEST 23)
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elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 9.0)
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set(CMAKE_C23_STANDARD_COMPILE_OPTION "-std=c2x")
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set(CMAKE_C23_EXTENSION_COMPILE_OPTION "-std=gnu2x")
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set(CMAKE_C_STANDARD_LATEST 23)
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endif()
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else()
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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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if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 13.0)
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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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set(CMAKE_C17_STANDARD_COMPILE_OPTION "/std:c17")
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set(CMAKE_C17_EXTENSION_COMPILE_OPTION "/std:c17")
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else()
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set(CMAKE_C11_STANDARD_COMPILE_OPTION "")
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set(CMAKE_C11_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_C17_STANDARD_COMPILE_OPTION "")
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set(CMAKE_C17_EXTENSION_COMPILE_OPTION "")
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endif()
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set(CMAKE_C_STANDARD_LATEST 17)
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if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 18.0)
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# This version of clang-cl does not have a -std:c23 flag.
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# Pass the standard through to the underlying clang directly.
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# Note that cmVisualStudio10TargetGenerator::ComputeClOptions
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# has a special case to map this back to -std:clatest in .vcxproj
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# files that also have CXX sources.
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set(CMAKE_C23_STANDARD_COMPILE_OPTION "-clang:-std=c23")
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set(CMAKE_C23_EXTENSION_COMPILE_OPTION "-clang:-std=c23")
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set(CMAKE_C_STANDARD_LATEST 23)
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endif()
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endif()
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if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 2.1)
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set(CMAKE_C90_STANDARD__HAS_FULL_SUPPORT ON)
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set(CMAKE_C99_STANDARD__HAS_FULL_SUPPORT ON)
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endif()
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if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 3.0)
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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 2.1 99 3.5.2 11 11.0 17)
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