macro(_record_compiler_features lang compile_flags feature_list) include("${CMAKE_ROOT}/Modules/Compiler/${CMAKE_${lang}_COMPILER_ID}-${lang}-FeatureTests.cmake" OPTIONAL) string(TOLOWER ${lang} lang_lc) file(REMOVE "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.bin") file(WRITE "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.${lang_lc}" " const char features[] = {\"\\n\"\n") get_property(known_features GLOBAL PROPERTY CMAKE_${lang}_KNOWN_FEATURES) foreach(feature ${known_features}) if (_cmake_feature_test_${feature}) if (${_cmake_feature_test_${feature}} STREQUAL 1) set(_feature_condition "\"1\" ") else() set(_feature_condition "#if ${_cmake_feature_test_${feature}}\n\"1\"\n#else\n\"0\"\n#endif\n") endif() file(APPEND "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.${lang_lc}" "\"${lang}_FEATURE:\"\n${_feature_condition}\"${feature}\\n\"\n") endif() endforeach() file(APPEND "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.${lang_lc}" "\n};\n\nint main(int argc, char** argv) { (void)argv; return features[argc]; }\n") if(CMAKE_${lang}_LINK_WITH_STANDARD_COMPILE_OPTION) # This toolchain requires use of the language standard flag # when linking in order to use the matching standard library. set(compile_flags_for_link "${compile_flags}") else() set(compile_flags_for_link "") endif() try_compile(CMAKE_${lang}_FEATURE_TEST ${CMAKE_BINARY_DIR} "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.${lang_lc}" COMPILE_DEFINITIONS "${compile_flags}" LINK_LIBRARIES "${compile_flags_for_link}" OUTPUT_VARIABLE _output COPY_FILE "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.bin" COPY_FILE_ERROR _copy_error ) if(CMAKE_${lang}_FEATURE_TEST AND NOT _copy_error) set(_result 0) else() set(_result 255) endif() unset(CMAKE_${lang}_FEATURE_TEST CACHE) unset(compile_flags_for_link) if (_result EQUAL 0) file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log "\n\nDetecting ${lang} [${compile_flags}] compiler features compiled with the following output:\n${_output}\n\n") if(EXISTS "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.bin") file(STRINGS "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.bin" features REGEX "${lang}_FEATURE:.*") foreach(info ${features}) file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log " Feature record: ${info}\n") string(REPLACE "${lang}_FEATURE:" "" info ${info}) string(SUBSTRING ${info} 0 1 has_feature) if(has_feature) string(REGEX REPLACE "^1" "" feature ${info}) list(APPEND ${feature_list} ${feature}) endif() endforeach() endif() else() file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log "Detecting ${lang} [${compile_flags}] compiler features failed to compile with the following output:\n${_output}\n${_copy_error}\n\n") endif() endmacro() macro(_record_compiler_features_c std) list(APPEND CMAKE_C${std}_COMPILE_FEATURES c_std_${std}) _record_compiler_features(C "${CMAKE_C${std}_STANDARD_COMPILE_OPTION}" CMAKE_C${std}_COMPILE_FEATURES) endmacro() macro(_record_compiler_features_cxx std) list(APPEND CMAKE_CXX${std}_COMPILE_FEATURES cxx_std_${std}) _record_compiler_features(CXX "${CMAKE_CXX${std}_STANDARD_COMPILE_OPTION}" CMAKE_CXX${std}_COMPILE_FEATURES) endmacro()