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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This change was originally made by commit74b1c9fc8e(Explicitly specify language flag when source LANGUAGE property is set, 2020-06-01, v3.19.0-rc1~722^2), but it was reverted by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
31 lines
1.0 KiB
CMake
31 lines
1.0 KiB
CMake
include(Compiler/Clang)
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__compiler_clang(CXX)
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__compiler_clang_cxx_standards(CXX)
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if("x${CMAKE_CXX_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU")
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if((NOT DEFINED CMAKE_DEPENDS_USE_COMPILER OR CMAKE_DEPENDS_USE_COMPILER)
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AND CMAKE_GENERATOR MATCHES "Makefiles|WMake"
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AND CMAKE_DEPFILE_FLAGS_CXX)
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# dependencies are computed by the compiler itself
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set(CMAKE_CXX_DEPFILE_FORMAT gcc)
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set(CMAKE_CXX_DEPENDS_USE_COMPILER TRUE)
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endif()
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set(CMAKE_CXX_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -x c++)
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set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
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endif()
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cmake_policy(GET CMP0025 appleClangPolicy)
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if(APPLE AND NOT appleClangPolicy STREQUAL NEW)
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return()
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endif()
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if("x${CMAKE_CXX_COMPILER_FRONTEND_VARIANT}" STREQUAL "xMSVC")
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set(CMAKE_CXX_CLANG_TIDY_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"
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AND CMAKE_DEPFILE_FLAGS_CXX)
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set(CMAKE_CXX_DEPENDS_USE_COMPILER TRUE)
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endif()
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endif()
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