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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++ ${name}")
if(CMAKE_CXX_STANDARD)
set(maybe_cxx_standard -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD})
else()
set(maybe_cxx_standard "")
endif()
try_compile(CMake_HAVE_CXX_${FEATURE}
${CMAKE_CURRENT_BINARY_DIR}
${CMAKE_CURRENT_LIST_DIR}/cm_cxx_${name}.cxx
CMAKE_FLAGS ${maybe_cxx_standard}
OUTPUT_VARIABLE OUTPUT
)
set(check_output "${OUTPUT}")
# Filter out MSBuild output that looks like a warning.
string(REGEX REPLACE " +0 Warning\\(s\\)" "" check_output "${check_output}")
# Filter out warnings caused by user flags.
string(REGEX REPLACE "[^\n]*warning:[^\n]*-Winvalid-command-line-argument[^\n]*" "" check_output "${check_output}")
# If using the feature causes warnings, treat it as broken/unavailable.
if(check_output MATCHES "[Ww]arning")
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()
cm_check_cxx_feature(fallthrough)
if(NOT CMake_HAVE_CXX_FALLTHROUGH)
cm_check_cxx_feature(gnu_fallthrough)
if(NOT CMake_HAVE_CXX_GNU_FALLTHROUGH)
cm_check_cxx_feature(attribute_fallthrough)
endif()
endif()
cm_check_cxx_feature(make_unique)
if(CMake_HAVE_CXX_MAKE_UNIQUE)
set(CMake_HAVE_CXX_UNIQUE_PTR 1)
endif()
cm_check_cxx_feature(unique_ptr)
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