#
# Check if the CXX compiler accepts a flag
#
# CHECK_FUNCTION_EXISTS - macro which checks if the function exists
# FLAG - the flags to try
# VARIABLE - variable to store the result
#

MACRO(CHECK_CXX_ACCEPTS_FLAG FLAGS  VARIABLE)
  MESSAGE(STATUS "Checking to see if CXX compiler acepts flag ${FLAGS}")
  TRY_COMPILE(${VARIABLE}
    ${CMAKE_BINARY_DIR}
    ${CMAKE_ROOT}/Modules/DummyCXXFile.cxx
    CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${FLAGS}
    OUTPUT_VARIABLE OUTPUT) 
  IF(${VARIABLE})
    MESSAGE(STATUS "Checking to see if CXX compiler acepts flag ${FLAGS} - yes")
    FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeOutput.log
      "Determining if the CXX compiler accepts the flag ${FLAGS} passed with "
      "the following output:\n${OUTPUT}\n\n")
  ELSE(${VARIABLE})
    MESSAGE(STATUS "Checking to see if CXX compiler acepts flag ${FLAGS} - no")
    FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeError.log
      "Determining if the CXX compiler accepts the flag ${FLAGS} failed with "
      "the following output:\n${OUTPUT}\n\n")
  ENDIF(${VARIABLE})
ENDMACRO(CHECK_CXX_ACCEPTS_FLAG)
