| include(CMakePushCheckState) | |
| include(CheckCompilerFlag) | |
| function(llvm_check_compiler_linker_flag lang flag out_var) | |
| # If testing a flag with check_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} ${flag}") | |
| check_compiler_flag("${lang}" "" ${out_var}) | |
| cmake_pop_check_state() | |
| endfunction() |