108 lines
4.9 KiB
CMake
108 lines
4.9 KiB
CMake
macro(test_large_files VARIABLE USE_64_SUFFIX)
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if(NOT DEFINED ${VARIABLE})
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message(STATUS "Checking if large (64-bit) file support is available...")
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if(USE_64_SUFFIX)
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set(SUFFIX_64 "64")
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else(USE_64_SUFFIX)
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set(SUFFIX_64 "")
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endif(USE_64_SUFFIX)
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# First try without any macros defined
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try_compile(LARGE_FILES_SUPPORTED "${CMAKE_BINARY_DIR}"
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"${CMAKE_MODULE_PATH}/LargeFiles${SUFFIX_64}.c"
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OUTPUT_VARIABLE TRY_LARGE_FILES_OUTPUT)
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if(VERBOSE_LARGE_FILES)
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message(STATUS "Large file output (no special flags):\n${TRY_LARGE_FILES_OUTPUT}")
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endif(VERBOSE_LARGE_FILES)
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if(NOT LARGE_FILES_SUPPORTED)
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# Try with C macro _FILE_OFFSET_BITS=64
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try_compile(LARGE_FILES_SUPPORTED "${CMAKE_BINARY_DIR}"
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"${CMAKE_MODULE_PATH}/LargeFiles${SUFFIX_64}.c"
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COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64"
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OUTPUT_VARIABLE TRY_LARGE_FILES_OUTPUT)
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if(VERBOSE_LARGE_FILES)
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message(STATUS "Large file output (_FILE_OFFSET_BITS=64):\n${TRY_LARGE_FILES_OUTPUT}")
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endif(VERBOSE_LARGE_FILES)
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if(LARGE_FILES_SUPPORTED)
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set(_FILE_OFFSET_BITS=64 CACHE INTERNAL "C macro _FILE_OFFSET_BITS=64 is required for 64-bit file support")
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endif(LARGE_FILES_SUPPORTED)
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endif(NOT LARGE_FILES_SUPPORTED)
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if(NOT LARGE_FILES_SUPPORTED)
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# Try with C macro _LARGEFILE_SOURCE
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try_compile(LARGE_FILES_SUPPORTED "${CMAKE_BINARY_DIR}"
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"${CMAKE_MODULE_PATH}/LargeFiles${SUFFIX_64}.c"
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COMPILE_DEFINITIONS "-D_LARGEFILE${SUFFIX_64}_SOURCE"
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OUTPUT_VARIABLE TRY_LARGE_FILES_OUTPUT)
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if(VERBOSE_LARGE_FILES)
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message(STATUS "Large file output (_LARGEFILE${SUFFIX_64}_SOURCE):\n${TRY_LARGE_FILES_OUTPUT}")
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endif(VERBOSE_LARGE_FILES)
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if(LARGE_FILES_SUPPORTED)
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set(_LARGEFILE${SUFFIX_64}_SOURCE=1 CACHE INTERNAL "C macro _LARGEFILE${SUFFIX_64}_SOURCE is required for 64-bit file support")
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endif(LARGE_FILES_SUPPORTED)
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endif(NOT LARGE_FILES_SUPPORTED)
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if(NOT LARGE_FILES_SUPPORTED)
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# Try with both C macro _FILE_OFFSET_BITS=64 and _LARGEFILE_SOURCE
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try_compile(LARGE_FILES_SUPPORTED "${CMAKE_BINARY_DIR}"
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"${CMAKE_MODULE_PATH}/LargeFiles${SUFFIX_64}.c"
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COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64" "-D_LARGEFILE${SUFFIX_64}_SOURCE"
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OUTPUT_VARIABLE TRY_LARGE_FILES_OUTPUT)
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if(VERBOSE_LARGE_FILES)
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message(STATUS "Large file output (_FILE_OFFSET_BITS=64 and _LARGEFILE${SUFFIX_64}_SOURCE):\n${TRY_LARGE_FILES_OUTPUT}")
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endif(VERBOSE_LARGE_FILES)
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if(LARGE_FILES_SUPPORTED)
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set(_FILE_OFFSET_BITS=64 CACHE INTERNAL "C macro _FILE_OFFSET_BITS=64 is required for 64-bit file support")
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set(_LARGEFILE${SUFFIX_64}_SOURCE=1 CACHE INTERNAL "C macro _LARGEFILE${SUFFIX_64}_SOURCE is required for 64-bit file support")
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endif(LARGE_FILES_SUPPORTED)
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endif(NOT LARGE_FILES_SUPPORTED)
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if(NOT LARGE_FILES_SUPPORTED)
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# Maybe we are using the Windows C standard library
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try_compile(LARGE_FILES_SUPPORTED "${CMAKE_BINARY_DIR}"
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"${CMAKE_MODULE_PATH}/LargeFilesWindows.c")
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endif(NOT LARGE_FILES_SUPPORTED)
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if(LARGE_FILES_SUPPORTED)
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message(STATUS "Checking if large (64-bit) file support is available - yes")
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set(${VARIABLE} 1 CACHE INTERNAL "Is large file support available?")
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else(LARGE_FILES_SUPPORTED)
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message(STATUS "Checking if large (64-bit) file support is available - no")
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set(${VARIABLE} 0 CACHE INTERNAL "Is large file support available?")
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endif(LARGE_FILES_SUPPORTED)
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endif(NOT DEFINED ${VARIABLE})
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endmacro(test_large_files VARIABLE USE_64_SUFFIX)
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macro(use_large_files TARGET USE_64_SUFFIX)
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test_large_files(USING_LARGE_FILES ${USE_64_SUFFIX})
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if(USING_LARGE_FILES)
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if(DEFINED _FILE_OFFSET_BITS)
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set_property(TARGET ${TARGET}
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APPEND PROPERTY COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=${_FILE_OFFSET_BITS}")
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endif(DEFINED _FILE_OFFSET_BITS)
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if(DEFINED _LARGEFILE_SOURCE)
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set_property(TARGET ${TARGET}
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APPEND PROPERTY COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE")
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endif(DEFINED _LARGEFILE_SOURCE)
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if(DEFINED _LARGEFILE64_SOURCE)
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set_property(TARGET ${TARGET}
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APPEND PROPERTY COMPILE_DEFINITIONS "-D_LARGEFILE64_SOURCE")
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endif(DEFINED _LARGEFILE64_SOURCE)
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else(USING_LARGE_FILES)
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message(FATAL_ERROR "Large file support not available")
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endif(USING_LARGE_FILES)
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endmacro(use_large_files TARGET USE_64_SUFFIX)
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