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