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function(cm_check_cxx_feature name)
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string(TOUPPER ${name} FEATURE)
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if(NOT DEFINED CMake_HAVE_CXX_${FEATURE})
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message(STATUS "Checking if compiler supports C++ ${name}")
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if(CMAKE_CXX_STANDARD)
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set(maybe_cxx_standard -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD})
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else()
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set(maybe_cxx_standard "")
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endif()
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try_compile(CMake_HAVE_CXX_${FEATURE}
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${CMAKE_CURRENT_BINARY_DIR}
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${CMAKE_CURRENT_LIST_DIR}/cm_cxx_${name}.cxx
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CMAKE_FLAGS ${maybe_cxx_standard}
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OUTPUT_VARIABLE OUTPUT
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)
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set(check_output "${OUTPUT}")
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# Filter out MSBuild output that looks like a warning.
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string(REGEX REPLACE " +0 Warning\\(s\\)" "" check_output "${check_output}")
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# Filter out warnings caused by user flags.
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string(REGEX REPLACE "[^\n]*warning:[^\n]*-Winvalid-command-line-argument[^\n]*" "" check_output "${check_output}")
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# Filter out warnings caused by local configuration.
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string(REGEX REPLACE "[^\n]*warning:[^\n]*directory not found for option[^\n]*" "" check_output "${check_output}")
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string(REGEX REPLACE "[^\n]*warning:[^\n]*object file compiled with -mlong-branch which is no longer needed[^\n]*" "" check_output "${check_output}")
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# Filter out xcodebuild warnings.
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string(REGEX REPLACE "[^\n]* xcodebuild\\[[0-9]*:[0-9]*\\] warning: [^\n]*" "" check_output "${check_output}")
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# If using the feature causes warnings, treat it as broken/unavailable.
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if(check_output MATCHES "[Ww]arning")
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set(CMake_HAVE_CXX_${FEATURE} OFF CACHE INTERNAL "TRY_COMPILE" FORCE)
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endif()
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if(CMake_HAVE_CXX_${FEATURE})
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message(STATUS "Checking if compiler supports C++ ${name} - yes")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Determining if compiler supports C++ ${name} passed with the following output:\n"
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"${OUTPUT}\n"
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"\n"
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)
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else()
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message(STATUS "Checking if compiler supports C++ ${name} - no")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Determining if compiler supports C++ ${name} failed with the following output:\n"
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"${OUTPUT}\n"
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"\n"
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)
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endif()
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endif()
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endfunction()
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cm_check_cxx_feature(make_unique)
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if(CMake_HAVE_CXX_MAKE_UNIQUE)
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set(CMake_HAVE_CXX_UNIQUE_PTR 1)
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endif()
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cm_check_cxx_feature(unique_ptr)
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