#
# Checks whether this platform has a given preprocessor directive
#
# VARIABLE - variable to store the result to
#

get_filename_component(_CheckCPPDirective_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)

macro(CHECK_CPP_DIRECTIVE_EXISTS DIRECTIVE VARIABLE)
  if(NOT DEFINED "HAVE_${VARIABLE}")
    message(
      STATUS
      "Checking to see if this platform has the ${DIRECTIVE} C-Preprocessor directive"
    )
    set(DIRECTIVE ${DIRECTIVE})
    configure_file(
      ${_CheckCPPDirective_DIR}/CheckCPPDirectiveExists.cxx.in
      ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckCPPDirectiveExists.cxx
    )
    try_compile(
      ${VARIABLE}
      ${CMAKE_BINARY_DIR}
      ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckCPPDirectiveExists.cxx
      OUTPUT_VARIABLE OUTPUT
    )
    if(${VARIABLE})
      set(HAVE_${VARIABLE} TRUE CACHE INTERNAL " ")
      message(
        STATUS
        "Checking to see if this platform supports has the ${DIRECTIVE} C-Preprocessor directive - yes"
      )
      file(
        APPEND
        ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
        "Checking to see if this platform supports has the ${DIRECTIVE} C-Preprocessor directive with "
        "the following output:\n${OUTPUT}\n\n"
      )
    else()
      message(
        STATUS
        "Checking to see if this platform supports has the ${DIRECTIVE} C-Preprocessor directive - no"
      )
      file(
        APPEND
        ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
        "Checking to see if this platform supports has the ${DIRECTIVE} C-Preprocessor directive with "
        "the following output:\n${OUTPUT}\n\n"
      )
    endif()
  endif()
endmacro()