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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This change was originally made by commit74b1c9fc8e(Explicitly specify language flag when source LANGUAGE property is set, 2020-06-01, v3.19.0-rc1~722^2), but it was reverted by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
18 lines
578 B
CMake
18 lines
578 B
CMake
include(RunCMake)
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function(run_CMP0119 status)
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set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/CMP0119-${status}-build)
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run_cmake(CMP0119-${status})
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set(RunCMake_TEST_NO_CLEAN 1)
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run_cmake_command(CMP0119-${status}-build "${CMAKE_COMMAND}" --build . --config Debug)
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endfunction()
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if(NOT RunCMake_GENERATOR MATCHES "Visual Studio|Xcode" AND
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NOT CMAKE_C_COMPILER_ID MATCHES "(Borland|Embarcadero|Watcom)")
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run_CMP0119(WARN)
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run_CMP0119(OLD)
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endif()
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if((CMAKE_C_COMPILER_ID MATCHES "(GNU|Clang|MSVC|Borland|Embarcadero|Intel|TI)"))
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run_CMP0119(NEW)
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endif()
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