135 lines
5.4 KiB
CMake
135 lines
5.4 KiB
CMake
# - Define macro to check large file support
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#
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# OPJ_TEST_LARGE_FILES(VARIABLE)
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#
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# VARIABLE will be set to true if off_t is 64 bits, and fseeko/ftello present.
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# This macro will also defines the necessary variable enable large file support, for instance
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# _LARGE_FILES
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# _LARGEFILE_SOURCE
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# _FILE_OFFSET_BITS 64
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# OPJ_HAVE_FSEEKO
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#
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# However, it is YOUR job to make sure these defines are set in a #cmakedefine so they
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# end up in a config.h file that is included in your source if necessary!
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#
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# Adapted from Gromacs project (http://www.gromacs.org/)
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# by Julien Malik
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#
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macro(OPJ_TEST_LARGE_FILES VARIABLE)
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if(NOT DEFINED ${VARIABLE})
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# On most platforms it is probably overkill to first test the flags for 64-bit off_t,
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# and then separately fseeko. However, in the future we might have 128-bit filesystems
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# (ZFS), so it might be dangerous to indiscriminately set e.g. _FILE_OFFSET_BITS=64.
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message(STATUS "Checking for 64-bit off_t")
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# First check without any special flags
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try_compile(FILE64_OK "${PROJECT_BINARY_DIR}"
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"${PROJECT_SOURCE_DIR}/cmake/TestFileOffsetBits.c")
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if(FILE64_OK)
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message(STATUS "Checking for 64-bit off_t - present")
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endif()
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if(NOT FILE64_OK)
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# Test with _FILE_OFFSET_BITS=64
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try_compile(FILE64_OK "${PROJECT_BINARY_DIR}"
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"${PROJECT_SOURCE_DIR}/cmake/TestFileOffsetBits.c"
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COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64" )
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if(FILE64_OK)
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message(STATUS "Checking for 64-bit off_t - present with _FILE_OFFSET_BITS=64")
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set(_FILE_OFFSET_BITS 64)
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endif()
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endif()
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if(NOT FILE64_OK)
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# Test with _LARGE_FILES
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try_compile(FILE64_OK "${PROJECT_BINARY_DIR}"
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"${PROJECT_SOURCE_DIR}/cmake/TestFileOffsetBits.c"
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COMPILE_DEFINITIONS "-D_LARGE_FILES" )
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if(FILE64_OK)
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message(STATUS "Checking for 64-bit off_t - present with _LARGE_FILES")
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set(_LARGE_FILES 1)
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endif()
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endif()
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if(NOT FILE64_OK)
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# Test with _LARGEFILE_SOURCE
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try_compile(FILE64_OK "${PROJECT_BINARY_DIR}"
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"${PROJECT_SOURCE_DIR}/cmake/TestFileOffsetBits.c"
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COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" )
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if(FILE64_OK)
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message(STATUS "Checking for 64-bit off_t - present with _LARGEFILE_SOURCE")
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set(_LARGEFILE_SOURCE 1)
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endif()
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endif()
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#if(NOT FILE64_OK)
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# # now check for Windows stuff
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# try_compile(FILE64_OK "${PROJECT_BINARY_DIR}"
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# "${PROJECT_SOURCE_DIR}/cmake/TestWindowsFSeek.c")
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# if(FILE64_OK)
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# message(STATUS "Checking for 64-bit off_t - present with _fseeki64")
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# set(HAVE__FSEEKI64 1)
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# endif()
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#endif()
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if(NOT FILE64_OK)
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message(STATUS "Checking for 64-bit off_t - not present")
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endif()
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set(_FILE_OFFSET_BITS ${_FILE_OFFSET_BITS} CACHE INTERNAL "Result of test for needed _FILE_OFFSET_BITS=64")
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set(_LARGE_FILES ${_LARGE_FILES} CACHE INTERNAL "Result of test for needed _LARGE_FILES")
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set(_LARGEFILE_SOURCE ${_LARGEFILE_SOURCE} CACHE INTERNAL "Result of test for needed _LARGEFILE_SOURCE")
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# Set the flags we might have determined to be required above
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configure_file("${PROJECT_SOURCE_DIR}/cmake/TestLargeFiles.c.cmake.in"
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"${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c")
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message(STATUS "Checking for fseeko/ftello")
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# Test if ftello/fseeko are available
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try_compile(FSEEKO_COMPILE_OK
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"${PROJECT_BINARY_DIR}"
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"${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c")
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if(FSEEKO_COMPILE_OK)
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message(STATUS "Checking for fseeko/ftello - present")
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endif()
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if(NOT FSEEKO_COMPILE_OK)
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# glibc 2.2 needs _LARGEFILE_SOURCE for fseeko (but not for 64-bit off_t...)
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try_compile(FSEEKO_COMPILE_OK
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"${PROJECT_BINARY_DIR}"
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"${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c"
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COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" )
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if(FSEEKO_COMPILE_OK)
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message(STATUS "Checking for fseeko/ftello - present with _LARGEFILE_SOURCE")
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set(_LARGEFILE_SOURCE ${_LARGEFILE_SOURCE} CACHE INTERNAL "Result of test for needed _LARGEFILE_SOURCE")
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endif()
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endif()
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if(FSEEKO_COMPILE_OK)
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set(OPJ_HAVE_FSEEKO ON CACHE INTERNAL "Result of test for fseeko/ftello")
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else()
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message(STATUS "Checking for fseeko/ftello - not found")
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set(OPJ_HAVE_FSEEKO OFF CACHE INTERNAL "Result of test for fseeko/ftello")
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endif()
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if(FILE64_OK AND FSEEKO_COMPILE_OK)
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message(STATUS "Large File support - found")
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set(${VARIABLE} ON CACHE INTERNAL "Result of test for large file support")
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else()
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message(STATUS "Large File support - not found")
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set(${VARIABLE} OFF CACHE INTERNAL "Result of test for large file support")
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endif()
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endif()
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endmacro()
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