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Diffstat (limited to 'CMake/TestLargeFiles.cmake')
| -rw-r--r-- | CMake/TestLargeFiles.cmake | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/CMake/TestLargeFiles.cmake b/CMake/TestLargeFiles.cmake new file mode 100644 index 00000000..96159d69 --- /dev/null +++ b/CMake/TestLargeFiles.cmake @@ -0,0 +1,120 @@ +# - 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) + + + |