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-rw-r--r--cmake/LargeFiles.cmake87
1 files changed, 87 insertions, 0 deletions
diff --git a/cmake/LargeFiles.cmake b/cmake/LargeFiles.cmake
new file mode 100644
index 0000000..b59295a
--- /dev/null
+++ b/cmake/LargeFiles.cmake
@@ -0,0 +1,87 @@
+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${SUFFIX_64}.c")
+
+ if(NOT LARGE_FILES_SUPPORTED)
+ # Try with C macro _FILE_OFFSET_BITS=64
+ try_compile(LARGE_FILES_SUPPORTED "${CMAKE_BINARY_DIR}"
+ "${CMAKE_MODULE_PATH}/LargeFiles${SUFFIX_64}.c"
+ COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64")
+
+ 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${SUFFIX_64}.c"
+ COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE${SUFFIX_64}")
+
+ if(LARGE_FILES_SUPPORTED)
+ set(_LARGEFILE_SOURCE${SUFFIX_64}=1 CACHE INTERNAL "C macro _LARGEFILE_SOURCE${SUFFIX_64} 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${SUFFIX_64}.c"
+ COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64" "-D_LARGEFILE_SOURCE${SUFFIX_64}")
+
+ 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_SOURCE${SUFFIX_64}=1 CACHE INTERNAL "C macro _LARGEFILE_SOURCE${SUFFIX_64} 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 _LARGEFILE_SOURCE64)
+ set_property(TARGET ${TARGET}
+ APPEND PROPERTY COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE64")
+ endif(DEFINED _LARGEFILE_SOURCE64)
+ else(USING_LARGE_FILES)
+ message(FATAL_ERROR "Large file support not available")
+ endif(USING_LARGE_FILES)
+endmacro(use_large_files TARGET USE_64_SUFFIX)