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      1 # - Check if _FILE_OFFSET_BITS macro needed for large files
      2 # CHECK_FILE_OFFSET_BITS ()
      3 #
      4 # The following variables may be set before calling this macro to
      5 # modify the way the check is run:
      6 #
      7 #  CMAKE_REQUIRED_FLAGS = string of compile command line flags
      8 #  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
      9 #  CMAKE_REQUIRED_INCLUDES = list of include directories
     10 # Copyright (c) 2009, Michihiro NAKAJIMA
     11 #
     12 # Redistribution and use is allowed according to the terms of the BSD license.
     13 # For details see the accompanying COPYING-CMAKE-SCRIPTS file.
     14 
     15 #INCLUDE(CheckCSourceCompiles)
     16 
     17 GET_FILENAME_COMPONENT(_selfdir_CheckFileOffsetBits
     18 	 "${CMAKE_CURRENT_LIST_FILE}" PATH)
     19 
     20 MACRO (CHECK_FILE_OFFSET_BITS)
     21   IF(NOT DEFINED _FILE_OFFSET_BITS)
     22     MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files")
     23     TRY_COMPILE(__WITHOUT_FILE_OFFSET_BITS_64
     24       ${CMAKE_CURRENT_BINARY_DIR}
     25       ${_selfdir_CheckFileOffsetBits}/CheckFileOffsetBits.c
     26       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS})
     27     IF(NOT __WITHOUT_FILE_OFFSET_BITS_64)
     28       TRY_COMPILE(__WITH_FILE_OFFSET_BITS_64
     29         ${CMAKE_CURRENT_BINARY_DIR}
     30         ${_selfdir_CheckFileOffsetBits}/CheckFileOffsetBits.c
     31         COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_FILE_OFFSET_BITS=64)
     32     ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64)
     33 
     34     IF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64)
     35       SET(_FILE_OFFSET_BITS 64 CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files")
     36       MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files - needed")
     37     ELSE(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64)
     38       SET(_FILE_OFFSET_BITS "" CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files")
     39       MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files - not needed")
     40     ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64)
     41   ENDIF(NOT DEFINED _FILE_OFFSET_BITS)
     42 
     43 ENDMACRO (CHECK_FILE_OFFSET_BITS)
     44