CMake/Source/Checks/cm_cxx11_unordered_map.cmake

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if(CMAKE_CXX_STANDARD AND NOT DEFINED CMake_HAVE_CXX11_UNORDERED_MAP)
message(STATUS "Checking if compiler supports C++11 unordered_map")
try_compile(CMake_HAVE_CXX11_UNORDERED_MAP
${CMAKE_CURRENT_BINARY_DIR}
${CMAKE_CURRENT_LIST_DIR}/cm_cxx11_unordered_map.cpp
CMAKE_FLAGS -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}
OUTPUT_VARIABLE OUTPUT
)
if(CMake_HAVE_CXX11_UNORDERED_MAP)
message(STATUS "Checking if compiler supports C++11 unordered_map - yes")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Determining if compiler supports C++11 unordered_map passed with the following output:\n"
"${OUTPUT}\n"
"\n"
)
else()
message(STATUS "Checking if compiler supports C++11 unordered_map - no")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining if compiler supports C++11 unordered_map failed with the following output:\n"
"${OUTPUT}\n"
"\n"
)
endif()
endif()