# - Define macro to check large file support # # OPJ_TEST_LARGE_FILES(VARIABLE) # # VARIABLE will be set to true if off_t is 64 bits, and fseeko/ftello present. # This macro will also set defines necessary enable large file support, for instance # _LARGE_FILES # _LARGEFILE_SOURCE # _FILE_OFFSET_BITS 64 # HAVE_FSEEKO # # However, it is YOUR job to make sure these defines are set in a CMakedefine so they # end up in a config.h file that is included in your source if necessary! MACRO(OPJ_TEST_LARGE_FILES VARIABLE) IF(NOT DEFINED ${VARIABLE}) # On most platforms it is probably overkill to first test the flags for 64-bit off_t, # and then separately fseeko. However, in the future we might have 128-bit filesystems # (ZFS), so it might be dangerous to indiscriminately set e.g. _FILE_OFFSET_BITS=64. MESSAGE(STATUS "Checking for 64-bit off_t") # First check without any special flags TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}" "${PROJECT_SOURCE_DIR}/CMake/TestFileOffsetBits.c") if(FILE64_OK) MESSAGE(STATUS "Checking for 64-bit off_t - present") endif(FILE64_OK) if(NOT FILE64_OK) # Test with _FILE_OFFSET_BITS=64 TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}" "${PROJECT_SOURCE_DIR}/CMake/TestFileOffsetBits.c" COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64" ) if(FILE64_OK) MESSAGE(STATUS "Checking for 64-bit off_t - present with _FILE_OFFSET_BITS=64") set(_FILE_OFFSET_BITS 64) endif(FILE64_OK) endif(NOT FILE64_OK) if(NOT FILE64_OK) # Test with _LARGE_FILES TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}" "${PROJECT_SOURCE_DIR}/CMake/TestFileOffsetBits.c" COMPILE_DEFINITIONS "-D_LARGE_FILES" ) if(FILE64_OK) MESSAGE(STATUS "Checking for 64-bit off_t - present with _LARGE_FILES") set(_LARGE_FILES 1) endif(FILE64_OK) endif(NOT FILE64_OK) if(NOT FILE64_OK) # Test with _LARGEFILE_SOURCE TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}" "${PROJECT_SOURCE_DIR}/CMake/TestFileOffsetBits.c" COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" ) if(FILE64_OK) MESSAGE(STATUS "Checking for 64-bit off_t - present with _LARGEFILE_SOURCE") set(_LARGEFILE_SOURCE 1) endif(FILE64_OK) endif(NOT FILE64_OK) if(NOT FILE64_OK) # now check for Windows stuff TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}" "${PROJECT_SOURCE_DIR}/CMake/TestWindowsFSeek.c") if(FILE64_OK) MESSAGE(STATUS "Checking for 64-bit off_t - present with _fseeki64") set(HAVE__FSEEKI64 1) endif(FILE64_OK) endif(NOT FILE64_OK) if(NOT FILE64_OK) MESSAGE(STATUS "Checking for 64-bit off_t - not present") else(NOT FILE64_OK) # Set the flags we might have determined to be required above configure_file("${PROJECT_SOURCE_DIR}/CMake/TestLargeFiles.c.cmake.in" "${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c") MESSAGE(STATUS "Checking for fseeko/ftello") # Test if ftello/fseeko are available TRY_COMPILE(FSEEKO_COMPILE_OK "${PROJECT_BINARY_DIR}" "${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c") if(FSEEKO_COMPILE_OK) MESSAGE(STATUS "Checking for fseeko/ftello - present") endif(FSEEKO_COMPILE_OK) if(NOT FSEEKO_COMPILE_OK) # glibc 2.2 neds _LARGEFILE_SOURCE for fseeko (but not 64-bit off_t...) TRY_COMPILE(FSEEKO_COMPILE_OK "${PROJECT_BINARY_DIR}" "${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c" COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" ) if(FSEEKO_COMPILE_OK) MESSAGE(STATUS "Checking for fseeko/ftello - present with _LARGEFILE_SOURCE") set(_LARGEFILE_SOURCE 1) endif(FSEEKO_COMPILE_OK) endif(NOT FSEEKO_COMPILE_OK) endif(NOT FILE64_OK) if(FSEEKO_COMPILE_OK) SET(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE) set(HAVE_FSEEKO 1) else(FSEEKO_COMPILE_OK) if (HAVE__FSEEKI64) SET(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE) SET(HAVE__FSEEKI64 1 CACHE INTERNAL "Windows 64-bit fseek" FORCE) else (HAVE__FSEEKI64) MESSAGE(STATUS "Checking for fseeko/ftello - not found") SET(${VARIABLE} 0 CACHE INTERNAL "Result of test for large file support" FORCE) endif (HAVE__FSEEKI64) endif(FSEEKO_COMPILE_OK) ENDIF(NOT DEFINED ${VARIABLE}) ENDMACRO(OPJ_TEST_LARGE_FILES VARIABLE)