CMake/Source/Checks/cm_cxx14_cstdio.cmake

set(CMake_CXX14_CSTDIO_BROKEN 0)
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang" AND CMAKE_CXX14_STANDARD_COMPILE_OPTION)
  if(NOT DEFINED CMake_CXX14_CSTDIO_WORKS)
    message(STATUS "Checking if compiler supports C++14 cstdio")
    try_compile(CMake_CXX14_CSTDIO_WORKS
      ${CMAKE_CURRENT_BINARY_DIR}
      ${CMAKE_CURRENT_LIST_DIR}/cm_cxx14_cstdio.cpp
      CMAKE_FLAGS -DCMAKE_CXX_STANDARD=14
      OUTPUT_VARIABLE OUTPUT
      )
    if(CMake_CXX14_CSTDIO_WORKS AND "${OUTPUT}" MATCHES "error: no member named.*gets.*in the global namespace")
      set_property(CACHE CMake_CXX14_CSTDIO_WORKS PROPERTY VALUE 0)
    endif()
    if(CMake_CXX14_CSTDIO_WORKS)
      message(STATUS "Checking if compiler supports C++14 cstdio - yes")
      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
        "Determining if compiler supports C++14 cstdio passed with the following output:\n"
        "${OUTPUT}\n"
        "\n"
        )
    else()
      message(STATUS "Checking if compiler supports C++14 cstdio - no")
      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
        "Determining if compiler supports C++14 cstdio failed with the following output:\n"
        "${OUTPUT}\n"
        "\n"
        )
    endif()
  endif()
  if(NOT CMake_CXX14_CSTDIO_WORKS)
    set(CMake_CXX14_CSTDIO_BROKEN 1)
  endif()
endif()