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#
# Check if the system supports 64 bit streams
#
# CHECK_FOR_64BIT_STREAMS - macro which checks the existence of 64 bit streams
# VARIABLE - variable to return result
#
MACRO(CHECK_FOR_64BIT_STREAMS VARIABLE)
IF(NOT DEFINED "${VARIABLE}")
SET(MACRO_CHECK_FOR_64BIT_STREAMS_FLAGS ${CMAKE_REQUIRED_FLAGS})
IF(CMAKE_NO_ANSI_STREAM_HEADERS)
SET(MACRO_CHECK_FOR_64BIT_STREAMS_FLAGS
"${MACRO_CHECK_FOR_64BIT_STREAMS_FLAGS} -DNO_ANSI")
ENDIF()
IF(SIZEOF_LONG_LONG)
SET(MACRO_CHECK_FOR_64BIT_STREAMS_FLAGS
"${MACRO_CHECK_FOR_64BIT_STREAMS_FLAGS} -DSIZEOF_LONG_LONG")
ENDIF()
IF(SIZEOF___INT64)
SET(MACRO_CHECK_FOR_64BIT_STREAMS_FLAGS
"${MACRO_CHECK_FOR_64BIT_STREAMS_FLAGS} -DSIZEOF___INT64")
ENDIF()
MESSAGE(STATUS "Check if system supports 64 bit streams")
TRY_COMPILE(${VARIABLE}
${CMAKE_BINARY_DIR}
${xdmf2_SOURCE_DIR}/CMake/CheckFor64BitStreams.cxx
CMAKE_FLAGS
-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FOR_64BIT_STREAMS_FLAGS}
OUTPUT_VARIABLE OUTPUT)
IF(${VARIABLE})
MESSAGE(STATUS "Check if system supports 64 bit streams - yes")
SET(${VARIABLE} 1 CACHE INTERNAL "Whether streams support 64-bit types")
ELSE()
MESSAGE(STATUS "Check if system supports 64 bit streams - no")
SET(${VARIABLE} "" CACHE INTERNAL "Whether streams support 64-bit types")
FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeError.log
"Determining if the system supports 64 bit streams "
"failed with the following output:\n"
"${OUTPUT}\n")
ENDIF()
ENDIF()
ENDMACRO()
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