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include(CheckLinkerFlag OPTIONAL)
if (COMMAND check_linker_flag)
macro(llvm_check_linker_flag)
check_linker_flag(${ARGN})
endmacro()
else()
# Until the minimum CMAKE version is 3.18
include(CheckCXXCompilerFlag)
# cmake builtin compatible, except we assume lang is C or CXX
function(llvm_check_linker_flag lang flag out_var)
cmake_policy(PUSH)
cmake_policy(SET CMP0056 NEW)
set(_CMAKE_EXE_LINKER_FLAGS_SAVE ${CMAKE_EXE_LINKER_FLAGS})
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${flag}")
if("${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()
set(CMAKE_EXE_LINKER_FLAGS ${_CMAKE_EXE_LINKER_FLAGS_SAVE})
cmake_policy(POP)
endfunction()
endif()
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