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# This code was copied from http://www.gromacs.org/
# and its toplevel COPYING file starts with:
#
# GROMACS is free software, distributed under the GNU General Public License
# (GPL) Version 2.
# - Define macro to check large file support
#
# GMX_TEST_LARGE_FILES(VARIABLE)
#
# VARIABLE will be set to true if 64-bit file support is available.
# This macro will also set defines as necessary to enable large file
# support, for instance:
# _LARGE_FILES
# _LARGEFILE_SOURCE
# _FILE_OFFSET_BITS=64
#
# 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(GMX_TEST_LARGE_FILES VARIABLE)
IF(NOT DEFINED ${VARIABLE})
# On most platforms it is probably overkill to first test the flags for 64-bit off_t,
# and then separately fseeko. However, in the future we might have 128-bit filesystems
# (ZFS), so it might be dangerous to indiscriminately set e.g. _FILE_OFFSET_BITS=64.
MESSAGE(STATUS "Checking for 64-bit off_t")
# First check without any special flags
TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}"
"${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c")
if(FILE64_OK)
MESSAGE(STATUS "64-bit off_t is present with no special flags")
endif(FILE64_OK)
if(NOT FILE64_OK)
# Test with _FILE_OFFSET_BITS=64
TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}"
"${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c"
COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64" )
if(FILE64_OK)
MESSAGE(STATUS "64-bit off_t is present with _FILE_OFFSET_BITS=64")
set(_FILE_OFFSET_BITS 64 CACHE INTERNAL "64-bit off_t requires _FILE_OFFSET_BITS=64")
endif(FILE64_OK)
endif(NOT FILE64_OK)
if(NOT FILE64_OK)
# Test with _LARGE_FILES
TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}"
"${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c"
COMPILE_DEFINITIONS "-D_LARGE_FILES" )
if(FILE64_OK)
MESSAGE(STATUS "64-bit off_t is present with _LARGE_FILES")
set(_LARGE_FILES 1 CACHE INTERNAL "64-bit off_t requires _LARGE_FILES")
endif(FILE64_OK)
endif(NOT FILE64_OK)
if(NOT FILE64_OK)
# Test with _LARGEFILE_SOURCE
TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}"
"${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c"
COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" )
if(FILE64_OK)
MESSAGE(STATUS "64-bit off_t is present with _LARGEFILE_SOURCE")
set(_LARGEFILE_SOURCE 1 CACHE INTERNAL "64-bit off_t requires _LARGEFILE_SOURCE")
endif(FILE64_OK)
endif(NOT FILE64_OK)
if(NOT FILE64_OK)
# now check for Windows stuff
MESSAGE(STATUS "64-bit off_t is not present")
MESSAGE(STATUS "Checking for _fseeki64")
TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}"
"${CMAKE_SOURCE_DIR}/cmake/TestWindowsFSeek.c")
if(FILE64_OK)
MESSAGE(STATUS "_fseeki64 is present")
set(HAVE__FSEEKI64 1 CACHE INTERNAL "64-bit file offsets require _fseeki64")
endif(FILE64_OK)
endif(NOT FILE64_OK)
if(NOT FILE64_OK)
MESSAGE(STATUS "64-bit file offset support not available")
else(NOT FILE64_OK)
# Set the flags we might have determined to be required above
configure_file("${CMAKE_SOURCE_DIR}/cmake/TestLargeFiles.c.cmakein"
"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c")
MESSAGE(STATUS "Checking for fseeko/ftello")
# Test if ftello/fseeko are available
TRY_COMPILE(FSEEKO_COMPILE_OK "${CMAKE_BINARY_DIR}"
"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c")
if(FSEEKO_COMPILE_OK)
MESSAGE(STATUS "Checking for fseeko/ftello - present")
endif(FSEEKO_COMPILE_OK)
if(NOT FSEEKO_COMPILE_OK)
# glibc 2.2 neds _LARGEFILE_SOURCE for fseeko (but not 64-bit off_t...)
TRY_COMPILE(FSEEKO_COMPILE_OK "${CMAKE_BINARY_DIR}"
"${CMAKE_BINARY_DIR}${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 CACHE INTERNAL "64-bit fseeko requires _LARGEFILE_SOURCE")
endif(FSEEKO_COMPILE_OK)
endif(NOT FSEEKO_COMPILE_OK)
endif(NOT FILE64_OK)
if(FSEEKO_COMPILE_OK)
SET(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE)
set(HAVE_FSEEKO 1 CACHE INTERNAL "64-bit fseeko is available" FORCE)
else(FSEEKO_COMPILE_OK)
if (HAVE__FSEEKI64)
SET(${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(GMX_TEST_LARGE_FILES VARIABLE)
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