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# - Check if the _FILE_OFFSET_BITS macro is needed for large files
# CHECK_FILE_OFFSET_BITS()
#
# The following variables may be set before calling this macro to
# modify the way the check is run:
#
# CMAKE_REQUIRED_FLAGS = string of compile command line flags
# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
# CMAKE_REQUIRED_INCLUDES = list of include directories
# Copyright (c) 2009, Chris Robinson
#
# Redistribution and use is allowed according to the terms of the LGPL license.
MACRO(CHECK_FILE_OFFSET_BITS)
IF(NOT DEFINED _FILE_OFFSET_BITS)
MESSAGE(STATUS "Checking _FILE_OFFSET_BITS for large files")
TRY_COMPILE(__WITHOUT_FILE_OFFSET_BITS_64
${CMAKE_CURRENT_BINARY_DIR}
${CMAKE_CURRENT_SOURCE_DIR}/cmake/CheckFileOffsetBits.c
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS})
IF(NOT __WITHOUT_FILE_OFFSET_BITS_64)
TRY_COMPILE(__WITH_FILE_OFFSET_BITS_64
${CMAKE_CURRENT_BINARY_DIR}
${CMAKE_CURRENT_SOURCE_DIR}/cmake/CheckFileOffsetBits.c
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_FILE_OFFSET_BITS=64)
ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64)
IF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64)
SET(_FILE_OFFSET_BITS 64 CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files")
MESSAGE(STATUS "Checking _FILE_OFFSET_BITS for large files - 64")
ELSE(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64)
SET(_FILE_OFFSET_BITS "" CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files")
MESSAGE(STATUS "Checking _FILE_OFFSET_BITS for large files - not needed")
ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64)
ENDIF(NOT DEFINED _FILE_OFFSET_BITS)
ENDMACRO(CHECK_FILE_OFFSET_BITS)
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