| function (_cmake_cxx_find_modules_json) |
| if (NOT CMAKE_CXX_STANDARD_LIBRARY STREQUAL "libstdc++") |
| set(CMAKE_CXX_COMPILER_IMPORT_STD_ERROR_MESSAGE "Only `libstdc++` is supported" PARENT_SCOPE) |
| return () |
| endif () |
| |
| if (NOT CMAKE_CXX_STDLIB_MODULES_JSON) |
| execute_process( |
| COMMAND |
| "${CMAKE_CXX_COMPILER}" |
| ${CMAKE_CXX_COMPILER_ID_ARG1} |
| -print-file-name=libstdc++.modules.json |
| OUTPUT_VARIABLE _gnu_libstdcxx_modules_json_file |
| ERROR_VARIABLE _gnu_libstdcxx_modules_json_file_err |
| RESULT_VARIABLE _gnu_libstdcxx_modules_json_file_res |
| OUTPUT_STRIP_TRAILING_WHITESPACE |
| ERROR_STRIP_TRAILING_WHITESPACE) |
| if (_gnu_libstdcxx_modules_json_file_res) |
| set(CMAKE_CXX_COMPILER_IMPORT_STD_ERROR_MESSAGE "Could not find `libstdc++.modules.json` resource" PARENT_SCOPE) |
| return () |
| endif () |
| set(CMAKE_CXX_STDLIB_MODULES_JSON "${_gnu_libstdcxx_modules_json_file}" PARENT_SCOPE) |
| endif () |
| endfunction () |
