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36 lines
1.2 KiB
CMake
36 lines
1.2 KiB
CMake
include(CMakePushCheckState)
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include(CheckCompilerFlag OPTIONAL)
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if(NOT COMMAND check_compiler_flag)
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include(CheckCCompilerFlag)
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include(CheckCXXCompilerFlag)
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endif()
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function(llvm_check_compiler_linker_flag lang flag out_var)
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# If testing a flag with check_c_compiler_flag, it gets added to the compile
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# command only, but not to the linker command in that test. If the flag
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# is vital for linking to succeed, the test would fail even if it would
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# have succeeded if it was included on both commands.
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#
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# Therefore, try adding the flag to CMAKE_REQUIRED_FLAGS, which gets
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# added to both compiling and linking commands in the tests.
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cmake_push_check_state()
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${flag}")
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if(COMMAND check_compiler_flag)
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check_compiler_flag("${lang}" "" ${out_var})
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else()
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# Until the minimum CMAKE version is 3.19
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# cmake builtin compatible, except we assume lang is C or CXX
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if("${lang}" STREQUAL "C")
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check_c_compiler_flag("" ${out_var})
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elseif("${lang}" STREQUAL "CXX")
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check_cxx_compiler_flag("" ${out_var})
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else()
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message(FATAL_ERROR "\"${lang}\" is not C or CXX")
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endif()
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endif()
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cmake_pop_check_state()
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endfunction()
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