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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)
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