39 lines
1.8 KiB
CMake
39 lines
1.8 KiB
CMake
# - Check if the _FILE_OFFSET_BITS macro is 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, Chris Robinson
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#
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# Redistribution and use is allowed according to the terms of the LGPL license.
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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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${CMAKE_CURRENT_BINARY_DIR}
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${CMAKE_CURRENT_SOURCE_DIR}/cmake/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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${CMAKE_CURRENT_SOURCE_DIR}/cmake/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 - 64")
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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) |