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TheRock/compiler/amd-llvm/compiler-rt/cmake/Modules/CheckAssemblerFlag.cmake
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41 lines
1.5 KiB
CMake

# Helper function to find out whether the assembler supports a particular
# command-line flag. You'd like to use the standard check_compiler_flag(), but
# that only supports a fixed list of languages, and ASM isn't one of them. So
# we do it ourselves, by trying to assemble an empty source file.
function(check_assembler_flag outvar flag)
if(NOT DEFINED "${outvar}")
if(NOT CMAKE_REQUIRED_QUIET)
message(CHECK_START "Checking for assembler flag ${flag}")
endif()
# Stop try_compile from attempting to link the result of the assembly, so
# that we don't depend on having a working linker, and also don't have to
# figure out what special symbol like _start needs to be defined in the
# test input.
#
# This change is made within the dynamic scope of this function, so
# CMAKE_TRY_COMPILE_TARGET_TYPE will be restored to its previous value on
# return.
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
# Try to assemble an empty file with a .S name, using the provided flag.
set(asm_source_file
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckAssemblerFlag.S)
write_file(${asm_source_file} "")
try_compile(${outvar}
${CMAKE_BINARY_DIR}
SOURCES ${asm_source_file}
CMAKE_FLAGS -DCMAKE_ASM_COMPILER_TARGET=${CMAKE_C_COMPILER_TARGET}
COMPILE_DEFINITIONS ${flag})
if(NOT CMAKE_REQUIRED_QUIET)
if(${outvar})
message(CHECK_PASS "Accepted")
else()
message(CHECK_FAIL "Not accepted")
endif()
endif()
endif()
endfunction()