diff options
Diffstat (limited to 'cmake/LargeFiles.cmake')
| -rw-r--r-- | cmake/LargeFiles.cmake | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/cmake/LargeFiles.cmake b/cmake/LargeFiles.cmake new file mode 100644 index 0000000..6e60a8d --- /dev/null +++ b/cmake/LargeFiles.cmake @@ -0,0 +1,107 @@ +macro(test_large_files VARIABLE USE_64_SUFFIX) + if(NOT DEFINED ${VARIABLE}) + message(STATUS "Checking if large (64-bit) file support is available...") + + if(USE_64_SUFFIX) + set(SUFFIX_64 "64") + else(USE_64_SUFFIX) + set(SUFFIX_64 "") + endif(USE_64_SUFFIX) + + # First try without any macros defined + try_compile(LARGE_FILES_SUPPORTED "${CMAKE_BINARY_DIR}" + "${CMAKE_MODULE_PATH}/LargeFiles${SUFFIX_64}.c" + OUTPUT_VARIABLE TRY_LARGE_FILES_OUTPUT) + + if(VERBOSE_LARGE_FILES) + message(STATUS "Large file output (no special flags):\n${TRY_LARGE_FILES_OUTPUT}") + endif(VERBOSE_LARGE_FILES) + + if(NOT LARGE_FILES_SUPPORTED) + # Try with C macro _FILE_OFFSET_BITS=64 + try_compile(LARGE_FILES_SUPPORTED "${CMAKE_BINARY_DIR}" + "${CMAKE_MODULE_PATH}/LargeFiles${SUFFIX_64}.c" + COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64" + OUTPUT_VARIABLE TRY_LARGE_FILES_OUTPUT) + + if(VERBOSE_LARGE_FILES) + message(STATUS "Large file output (_FILE_OFFSET_BITS=64):\n${TRY_LARGE_FILES_OUTPUT}") + endif(VERBOSE_LARGE_FILES) + + if(LARGE_FILES_SUPPORTED) + set(_FILE_OFFSET_BITS=64 CACHE INTERNAL "C macro _FILE_OFFSET_BITS=64 is required for 64-bit file support") + endif(LARGE_FILES_SUPPORTED) + endif(NOT LARGE_FILES_SUPPORTED) + + if(NOT LARGE_FILES_SUPPORTED) + # Try with C macro _LARGEFILE_SOURCE + + try_compile(LARGE_FILES_SUPPORTED "${CMAKE_BINARY_DIR}" + "${CMAKE_MODULE_PATH}/LargeFiles${SUFFIX_64}.c" + COMPILE_DEFINITIONS "-D_LARGEFILE${SUFFIX_64}_SOURCE" + OUTPUT_VARIABLE TRY_LARGE_FILES_OUTPUT) + + if(VERBOSE_LARGE_FILES) + message(STATUS "Large file output (_LARGEFILE${SUFFIX_64}_SOURCE):\n${TRY_LARGE_FILES_OUTPUT}") + endif(VERBOSE_LARGE_FILES) + + if(LARGE_FILES_SUPPORTED) + set(_LARGEFILE${SUFFIX_64}_SOURCE=1 CACHE INTERNAL "C macro _LARGEFILE${SUFFIX_64}_SOURCE is required for 64-bit file support") + endif(LARGE_FILES_SUPPORTED) + endif(NOT LARGE_FILES_SUPPORTED) + + if(NOT LARGE_FILES_SUPPORTED) + # Try with both C macro _FILE_OFFSET_BITS=64 and _LARGEFILE_SOURCE + try_compile(LARGE_FILES_SUPPORTED "${CMAKE_BINARY_DIR}" + "${CMAKE_MODULE_PATH}/LargeFiles${SUFFIX_64}.c" + COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64" "-D_LARGEFILE${SUFFIX_64}_SOURCE" + OUTPUT_VARIABLE TRY_LARGE_FILES_OUTPUT) + + if(VERBOSE_LARGE_FILES) + message(STATUS "Large file output (_FILE_OFFSET_BITS=64 and _LARGEFILE${SUFFIX_64}_SOURCE):\n${TRY_LARGE_FILES_OUTPUT}") + endif(VERBOSE_LARGE_FILES) + + if(LARGE_FILES_SUPPORTED) + set(_FILE_OFFSET_BITS=64 CACHE INTERNAL "C macro _FILE_OFFSET_BITS=64 is required for 64-bit file support") + set(_LARGEFILE${SUFFIX_64}_SOURCE=1 CACHE INTERNAL "C macro _LARGEFILE${SUFFIX_64}_SOURCE is required for 64-bit file support") + endif(LARGE_FILES_SUPPORTED) + endif(NOT LARGE_FILES_SUPPORTED) + + if(NOT LARGE_FILES_SUPPORTED) + # Maybe we are using the Windows C standard library + try_compile(LARGE_FILES_SUPPORTED "${CMAKE_BINARY_DIR}" + "${CMAKE_MODULE_PATH}/LargeFilesWindows.c") + endif(NOT LARGE_FILES_SUPPORTED) + + if(LARGE_FILES_SUPPORTED) + message(STATUS "Checking if large (64-bit) file support is available - yes") + set(${VARIABLE} 1 CACHE INTERNAL "Is large file support available?") + else(LARGE_FILES_SUPPORTED) + message(STATUS "Checking if large (64-bit) file support is available - no") + set(${VARIABLE} 0 CACHE INTERNAL "Is large file support available?") + endif(LARGE_FILES_SUPPORTED) + endif(NOT DEFINED ${VARIABLE}) +endmacro(test_large_files VARIABLE USE_64_SUFFIX) + +macro(use_large_files TARGET USE_64_SUFFIX) + test_large_files(USING_LARGE_FILES ${USE_64_SUFFIX}) + + if(USING_LARGE_FILES) + if(DEFINED _FILE_OFFSET_BITS) + set_property(TARGET ${TARGET} + APPEND PROPERTY COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=${_FILE_OFFSET_BITS}") + endif(DEFINED _FILE_OFFSET_BITS) + + if(DEFINED _LARGEFILE_SOURCE) + set_property(TARGET ${TARGET} + APPEND PROPERTY COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE") + endif(DEFINED _LARGEFILE_SOURCE) + + if(DEFINED _LARGEFILE64_SOURCE) + set_property(TARGET ${TARGET} + APPEND PROPERTY COMPILE_DEFINITIONS "-D_LARGEFILE64_SOURCE") + endif(DEFINED _LARGEFILE64_SOURCE) + else(USING_LARGE_FILES) + message(FATAL_ERROR "Large file support not available") + endif(USING_LARGE_FILES) +endmacro(use_large_files TARGET USE_64_SUFFIX) |