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macro(record_compiler_features lang compile_flags feature_list)
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include("${CMAKE_ROOT}/Modules/Compiler/${CMAKE_${lang}_COMPILER_ID}-${lang}-FeatureTests.cmake" OPTIONAL)
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string(TOLOWER ${lang} lang_lc)
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file(REMOVE "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.bin")
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file(WRITE "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.${lang_lc}" "
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const char features[] = {\"\\n\"\n")
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get_property(known_features GLOBAL PROPERTY CMAKE_${lang}_KNOWN_FEATURES)
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foreach(feature ${known_features})
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if (_cmake_feature_test_${feature})
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if (${_cmake_feature_test_${feature}} STREQUAL 1)
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set(_feature_condition "\"1\" ")
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else()
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set(_feature_condition "#if ${_cmake_feature_test_${feature}}\n\"1\"\n#else\n\"0\"\n#endif\n")
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endif()
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file(APPEND "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.${lang_lc}" "\"${lang}_FEATURE:\"\n${_feature_condition}\"${feature}\\n\"\n")
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endif()
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endforeach()
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file(APPEND "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.${lang_lc}"
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"\n};\n\nint main(int argc, char** argv) { (void)argv; return features[argc]; }\n")
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try_compile(CMAKE_${lang}_FEATURE_TEST
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${CMAKE_BINARY_DIR} "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.${lang_lc}"
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COMPILE_DEFINITIONS "${compile_flags}"
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OUTPUT_VARIABLE _output
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COPY_FILE "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.bin"
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COPY_FILE_ERROR _copy_error
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)
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if(CMAKE_${lang}_FEATURE_TEST AND NOT _copy_error)
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set(_result 0)
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else()
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set(_result 255)
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endif()
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unset(CMAKE_${lang}_FEATURE_TEST CACHE)
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if (_result EQUAL 0)
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"\n\nDetecting ${lang} [${compile_flags}] compiler features compiled with the following output:\n${_output}\n\n")
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if(EXISTS "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.bin")
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file(STRINGS "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.bin"
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features REGEX "${lang}_FEATURE:.*")
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foreach(info ${features})
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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" Feature record: ${info}\n")
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string(REPLACE "${lang}_FEATURE:" "" info ${info})
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string(SUBSTRING ${info} 0 1 has_feature)
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if(has_feature)
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string(REGEX REPLACE "^1" "" feature ${info})
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list(APPEND ${feature_list} ${feature})
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endif()
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endforeach()
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endif()
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else()
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Detecting ${lang} [${compile_flags}] compiler features failed to compile with the following output:\n${_output}\n${_copy_error}\n\n")
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endif()
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endmacro()
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