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 compile 6 # command only, but not to the linker command in that test. If the flag 7 # is vital for linking to succeed, the test would fail even if it would 8 # have succeeded if it was included on both commands. 9 # 10 # Therefore, try adding the flag to CMAKE_REQUIRED_FLAGS, which gets 11 # 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