18 lines · plain
1include(CMakePushCheckState)2include(CheckCompilerFlag)3 4function(llvm_check_compiler_linker_flag lang flag out_var)5 # If testing a flag with check_compiler_flag, it gets added to the compile6 # command only, but not to the linker command in that test. If the flag7 # is vital for linking to succeed, the test would fail even if it would8 # have succeeded if it was included on both commands.9 #10 # Therefore, try adding the flag to CMAKE_REQUIRED_FLAGS, which gets11 # added to both compiling and linking commands in the tests.12 13 cmake_push_check_state()14 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${flag}")15 check_compiler_flag("${lang}" "" ${out_var})16 cmake_pop_check_state()17endfunction()18