project: Add infrastructure for recording CXX compiler features
Add a feature test using the compiler macros and the preprocessor to determine available features. Add a CMAKE_CXX_COMPILE_FEATURES variable which contains all features known to the loaded compiler, and a CMAKE_CXX_KNOWN_FEATURES variable containing all features known to CMake. Add language standard specific variables for internal use to determine the standard-specific compile flags to use. This will be extended to other languages in the future. Follow-up commits will add features which will be recorded by the feature test.
This commit is contained in:
Stephen Kelly
parent
913394af24
commit
faeddf64f2
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@ -257,6 +257,8 @@ Variables for Languages
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:maxdepth: 1
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/variable/CMAKE_COMPILER_IS_GNULANG
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/variable/CMAKE_CXX_COMPILE_FEATURES
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/variable/CMAKE_CXX_KNOWN_FEATURES
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/variable/CMAKE_CXX_STANDARD
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/variable/CMAKE_CXX_EXTENSIONS
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/variable/CMAKE_Fortran_MODDIR_DEFAULT
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@ -0,0 +1,8 @@
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CMAKE_CXX_COMPILE_FEATURES
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--------------------------
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List of features known to the C++ compiler
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These features are known to be available for use with the C++ compiler. This
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list is a subset of the features listed in the :variable:`CMAKE_CXX_KNOWN_FEATURES`
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variable.
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@ -0,0 +1,8 @@
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CMAKE_CXX_KNOWN_FEATURES
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------------------------
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List of C++ features known to this version of CMake.
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The features listed in this variable may be known to be available to the
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C++ compiler. If the feature is available with the C++ compiler, it will
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be listed in the :variable:`CMAKE_CXX_COMPILE_FEATURES` variable.
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@ -2,6 +2,9 @@ set(CMAKE_CXX_COMPILER "@CMAKE_CXX_COMPILER@")
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set(CMAKE_CXX_COMPILER_ARG1 "@CMAKE_CXX_COMPILER_ARG1@")
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set(CMAKE_CXX_COMPILER_ID "@CMAKE_CXX_COMPILER_ID@")
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set(CMAKE_CXX_COMPILER_VERSION "@CMAKE_CXX_COMPILER_VERSION@")
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set(CMAKE_CXX_COMPILE_FEATURES "@CMAKE_CXX_COMPILE_FEATURES@")
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set(CMAKE_CXX11_COMPILE_FEATURES "@CMAKE_CXX11_COMPILE_FEATURES@")
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set(CMAKE_CXX_PLATFORM_ID "@CMAKE_CXX_PLATFORM_ID@")
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set(CMAKE_CXX_SIMULATE_ID "@CMAKE_CXX_SIMULATE_ID@")
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set(CMAKE_CXX_SIMULATE_VERSION "@CMAKE_CXX_SIMULATE_VERSION@")
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@ -0,0 +1,43 @@
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#=============================================================================
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# Copyright 2013 Stephen Kelly <steveire@gmail.com>
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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function(cmake_determine_compile_features lang)
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if(lang STREQUAL CXX AND COMMAND cmake_record_cxx_compile_features)
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message(STATUS "Detecting ${lang} compile features")
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set(CMAKE_CXX11_COMPILE_FEATURES)
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include("${CMAKE_ROOT}/Modules/Internal/FeatureTesting.cmake")
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cmake_record_cxx_compile_features()
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if(NOT _result EQUAL 0)
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message(STATUS "Detecting ${lang} compile features - failed")
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return()
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endif()
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if(NOT CMAKE_CXX_COMPILE_FEATURES)
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set(CMAKE_CXX_COMPILE_FEATURES
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${CMAKE_CXX11_COMPILE_FEATURES}
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)
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endif()
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set(CMAKE_CXX_COMPILE_FEATURES ${CMAKE_CXX_COMPILE_FEATURES} PARENT_SCOPE)
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set(CMAKE_CXX11_COMPILE_FEATURES ${CMAKE_CXX11_COMPILE_FEATURES} PARENT_SCOPE)
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message(STATUS "Detecting ${lang} compile features - done")
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endif()
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endfunction()
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@ -66,6 +66,9 @@ else()
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# Try to identify the ABI and configure it into CMakeCXXCompiler.cmake
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include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerABI.cmake)
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CMAKE_DETERMINE_COMPILER_ABI(CXX ${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp)
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# Try to identify the compiler features
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include(${CMAKE_ROOT}/Modules/CMakeDetermineCompileFeatures.cmake)
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CMAKE_DETERMINE_COMPILE_FEATURES(CXX)
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# Re-configure to save learned information.
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configure_file(
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@ -0,0 +1,57 @@
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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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extern const char features[] = {\"\"\n")
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foreach(feature ${CMAKE_${lang}_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.${lang_lc}"
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"\n};\n\nint main(int, char **) { return 0; }\n")
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try_compile(CMAKE_${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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