2021-12-08 11:32:04 +00:00
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#
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# This file is part of the GROMACS molecular simulation package.
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#
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# Copyright (c) 2009,2010,2012,2014,2019, by the GROMACS development team, led by
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# Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
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# and including many others, as listed in the AUTHORS file in the
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# top-level source directory and at http://www.gromacs.org.
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#
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# GROMACS is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public License
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# as published by the Free Software Foundation; either version 2.1
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# of the License, or (at your option) any later version.
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#
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# GROMACS is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with GROMACS; if not, see
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# http://www.gnu.org/licenses, or write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# If you want to redistribute modifications to GROMACS, please
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# consider that scientific software is very special. Version
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# control is crucial - bugs must be traceable. We will be happy to
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# consider code for inclusion in the official distribution, but
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# derived work must not be called official GROMACS. Details are found
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# in the README & COPYING files - if they are missing, get the
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# official version at http://www.gromacs.org.
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#
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# To help us fund GROMACS development, we humbly ask that you cite
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# the research papers on the package. Check out http://www.gromacs.org.
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# Forked from Gromacs
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# - Define macro to check large file support
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#
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# myx_cmake_test_large_files(VARIABLE)
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#
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# VARIABLE will be set to true if off_t is 64 bits, and fseeko/ftello present.
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# This macro will also set defines necessary enable large file support, for instance
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# _LARGE_FILES
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# _LARGEFILE_SOURCE
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# _FILE_OFFSET_BITS 64
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# HAVE_FSEEKO
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# HAVE__FSEEKI64
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#
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# However, it is YOUR job to make sure these defines are set in a cmakedefine so they
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# end up in a config.h file that is included in your source if necessary!
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include(CheckTypeSize)
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macro(myx_cmake_test_large_files VARIABLE)
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if(NOT DEFINED ${VARIABLE})
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# On most platforms it is probably overkill to first test the flags for 64-bit off_t,
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# and then separately fseeko. However, in the future we might have 128-bit filesystems
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# (ZFS), so it might be dangerous to indiscriminately set e.g. _FILE_OFFSET_BITS=64.
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message(STATUS "Checking for 64-bit off_t")
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# First check without any special flags
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2021-12-09 11:41:26 +00:00
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try_compile(FILE64_OK "${CMAKE_BINARY_DIR}" "${MYX_CMAKE_FUNCTIONS_DIR}/largefiles/TestFileOffsetBits.c")
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2021-12-08 11:32:04 +00:00
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if(FILE64_OK)
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message(STATUS "Checking for 64-bit off_t - present")
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endif()
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if(NOT FILE64_OK)
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# Test with _FILE_OFFSET_BITS=64
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2021-12-09 11:41:26 +00:00
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try_compile(FILE64_OK "${CMAKE_BINARY_DIR}" "${MYX_CMAKE_FUNCTIONS_DIR}/largefiles/TestFileOffsetBits.c"
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2021-12-08 11:32:04 +00:00
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COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64")
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if(FILE64_OK)
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message(STATUS "Checking for 64-bit off_t - present with _FILE_OFFSET_BITS=64")
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set(_FILE_OFFSET_BITS 64 CACHE INTERNAL "64-bit off_t requires _FILE_OFFSET_BITS=64")
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endif()
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endif()
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if(NOT FILE64_OK)
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# Test with _LARGE_FILES
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2021-12-09 11:41:26 +00:00
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try_compile(FILE64_OK "${CMAKE_BINARY_DIR}" "${MYX_CMAKE_FUNCTIONS_DIR}/largefiles/TestFileOffsetBits.c"
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2021-12-08 11:32:04 +00:00
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COMPILE_DEFINITIONS "-D_LARGE_FILES")
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if(FILE64_OK)
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message(STATUS "Checking for 64-bit off_t - present with _LARGE_FILES")
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set(_LARGE_FILES 1 CACHE INTERNAL "64-bit off_t requires _LARGE_FILES")
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endif()
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endif()
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if(NOT FILE64_OK)
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# Test with _LARGEFILE_SOURCE
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2021-12-09 11:41:26 +00:00
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try_compile(FILE64_OK "${CMAKE_BINARY_DIR}" "${MYX_CMAKE_FUNCTIONS_DIR}/largefiles/TestFileOffsetBits.c"
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2021-12-08 11:32:04 +00:00
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COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE")
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if(FILE64_OK)
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message(STATUS "Checking for 64-bit off_t - present with _LARGEFILE_SOURCE")
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set(_LARGEFILE_SOURCE 1 CACHE INTERNAL "64-bit off_t requires _LARGEFILE_SOURCE")
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endif()
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endif()
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if(NOT FILE64_OK)
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message(STATUS "Checking for 64-bit off_t - not present")
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else()
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# 64-bit off_t found. Now check that ftello/fseeko is available.
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# Set the flags we might have determined to be required above
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2021-12-09 11:41:26 +00:00
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configure_file("${MYX_CMAKE_FUNCTIONS_DIR}/largefiles/TestLargeFiles.c.in"
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"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c")
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message(STATUS "Checking for fseeko/ftello")
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# Test if ftello/fseeko are available
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try_compile(FSEEKO_COMPILE_OK "${CMAKE_BINARY_DIR}"
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"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c")
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if(FSEEKO_COMPILE_OK)
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message(STATUS "Checking for fseeko/ftello - present")
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endif()
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if(NOT FSEEKO_COMPILE_OK)
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# glibc 2.2 neds _LARGEFILE_SOURCE for fseeko (but not 64-bit off_t...)
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try_compile(
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FSEEKO_COMPILE_OK "${CMAKE_BINARY_DIR}"
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"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c"
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COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE")
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if(FSEEKO_COMPILE_OK)
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message(STATUS "Checking for fseeko/ftello - present with _LARGEFILE_SOURCE")
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set(_LARGEFILE_SOURCE 1 CACHE INTERNAL "64-bit fseeko requires _LARGEFILE_SOURCE")
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else()
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set(FILE64_OK 0)
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message(STATUS "64-bit off_t present but fseeko/ftello not found!")
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endif()
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endif()
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endif()
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# cmake-lint: disable=C0103
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if(NOT FILE64_OK)
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# now check for Windows stuff
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2021-12-09 11:41:26 +00:00
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try_compile(FILE64_OK "${CMAKE_BINARY_DIR}" "${MYX_CMAKE_FUNCTIONS_DIR}/largefiles/TestWindowsFSeek.c")
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if(FILE64_OK)
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message(STATUS "Checking for 64-bit off_t - present with _fseeki64")
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set(HAVE__FSEEKI64 1 CACHE INTERNAL "64-bit off_t requires _fseeki64")
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endif()
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endif()
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if(FSEEKO_COMPILE_OK)
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set(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE)
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set(HAVE_FSEEKO 1 CACHE INTERNAL "64bit fseeko is available" FORCE)
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elseif(HAVE__FSEEKI64)
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set(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE)
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set(HAVE__FSEEKI64 1 CACHE INTERNAL "Windows 64-bit fseek" FORCE)
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else()
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check_type_size("long int" SIZEOF_LONG_INT)
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if(SIZEOF_LONG_INT EQUAL 8) #standard fseek is OK for 64bit
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set(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE)
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else()
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message(FATAL_ERROR "Checking for 64bit file support failed.")
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endif()
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endif()
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endif()
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endmacro(myx_cmake_test_large_files VARIABLE)
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