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44 lines
1.9 KiB
CMake
44 lines
1.9 KiB
CMake
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# - Check if _FILE_OFFSET_BITS macro needed for large files
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# CHECK_FILE_OFFSET_BITS ()
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#
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# The following variables may be set before calling this macro to
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# modify the way the check is run:
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#
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# CMAKE_REQUIRED_FLAGS = string of compile command line flags
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# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
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# CMAKE_REQUIRED_INCLUDES = list of include directories
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# Copyright (c) 2009, Michihiro NAKAJIMA
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#
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# Redistribution and use is allowed according to the terms of the BSD license.
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# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
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#INCLUDE(CheckCSourceCompiles)
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GET_FILENAME_COMPONENT(_selfdir_CheckFileOffsetBits
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"${CMAKE_CURRENT_LIST_FILE}" PATH)
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MACRO (CHECK_FILE_OFFSET_BITS)
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IF(NOT DEFINED _FILE_OFFSET_BITS)
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MESSAGE(STATUS "Checking _FILE_OFFSET_BITS for large files")
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TRY_COMPILE(__WITHOUT_FILE_OFFSET_BITS_64
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${CMAKE_CURRENT_BINARY_DIR}
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${_selfdir_CheckFileOffsetBits}/CheckFileOffsetBits.c
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS})
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IF(NOT __WITHOUT_FILE_OFFSET_BITS_64)
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TRY_COMPILE(__WITH_FILE_OFFSET_BITS_64
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${CMAKE_CURRENT_BINARY_DIR}
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${_selfdir_CheckFileOffsetBits}/CheckFileOffsetBits.c
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_FILE_OFFSET_BITS=64)
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ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64)
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IF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64)
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SET(_FILE_OFFSET_BITS 64 CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files")
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MESSAGE(STATUS "Checking _FILE_OFFSET_BITS for large files - needed")
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ELSE(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64)
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SET(_FILE_OFFSET_BITS "" CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files")
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MESSAGE(STATUS "Checking _FILE_OFFSET_BITS for large files - not needed")
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ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64)
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ENDIF(NOT DEFINED _FILE_OFFSET_BITS)
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ENDMACRO (CHECK_FILE_OFFSET_BITS)
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