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function(cm_check_cxx_feature name)
string(TOUPPER ${name} FEATURE)
if(NOT DEFINED CMake_HAVE_CXX_${FEATURE})
message(STATUS "Checking if compiler supports C++ ${name}")
try_compile(CMake_HAVE_CXX_${FEATURE}
${CMAKE_CURRENT_BINARY_DIR}
${CMAKE_CURRENT_LIST_DIR}/cm_cxx_${name}.cxx
CMAKE_FLAGS -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}
OUTPUT_VARIABLE OUTPUT
)
# If using the feature causes warnings, treat it as broken/unavailable.
if(OUTPUT MATCHES "warning")
set(CMake_HAVE_CXX_${FEATURE} OFF CACHE INTERNAL "TRY_COMPILE" FORCE)
endif()
if(CMake_HAVE_CXX_${FEATURE})
message(STATUS "Checking if compiler supports C++ ${name} - yes")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Determining if compiler supports C++ ${name} passed with the following output:\n"
"${OUTPUT}\n"
"\n"
)
else()
message(STATUS "Checking if compiler supports C++ ${name} - no")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining if compiler supports C++ ${name} failed with the following output:\n"
"${OUTPUT}\n"
"\n"
)
endif()
endif()
endfunction()
if(CMAKE_CXX_STANDARD)
cm_check_cxx_feature(nullptr)
cm_check_cxx_feature(override)
cm_check_cxx_feature(unordered_map)
cm_check_cxx_feature(unordered_set)
endif()
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