forked from osmocom/wireshark
Copy over cmake largfile detection from the gromacs project.
svn path=/trunk/; revision=50824
This commit is contained in:
Jörg Mayer
parent
d937adcc9e
commit
1cbd49e61b
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/* This code was copied from http://www.gromacs.org/
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* and its toplevel COPYING file starts with:
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*
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* GROMACS is free software, distributed under the GNU General Public License
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* (GPL) Version 2.
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*/
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#include <sys/types.h>
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int main(int argc, char **argv)
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{
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/* Cause a compile-time error if off_t is smaller than 64 bits */
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#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
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int off_t_is_large[ (LARGE_OFF_T % 2147483629 == 721 && LARGE_OFF_T % 2147483647 == 1) ? 1 : -1 ];
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return 0;
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}
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/* This code was copied from http://www.gromacs.org/
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* and its toplevel COPYING file starts with:
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*
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* GROMACS is free software, distributed under the GNU General Public License
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* (GPL) Version 2.
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*/
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#cmakedefine _LARGEFILE_SOURCE
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#cmakedefine _LARGEFILE64_SOURCE
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#cmakedefine _LARGE_FILES
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#cmakedefine _FILE_OFFSET_BITS @_FILE_OFFSET_BITS@
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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int main(int argc, char **argv)
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{
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/* Cause a compile-time error if off_t is smaller than 64 bits,
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* and make sure we have ftello / fseeko.
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*/
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#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
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int off_t_is_large[ (LARGE_OFF_T % 2147483629 == 721 && LARGE_OFF_T % 2147483647 == 1) ? 1 : -1 ];
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FILE *fp = fopen(argv[0],"r");
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off_t offset = ftello( fp );
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fseeko( fp, offset, SEEK_CUR );
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fclose(fp);
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return 0;
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}
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# This code was copied from http://www.gromacs.org/
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# and its toplevel COPYING file starts with:
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#
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# GROMACS is free software, distributed under the GNU General Public License
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# (GPL) Version 2.
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# - Define macro to check large file support
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#
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# GMX_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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#
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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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MACRO(GMX_TEST_LARGE_FILES VARIABLE)
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IF(NOT DEFINED ${VARIABLE})
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# On most platforms it is probably overkill to first test the flags for 64-bit off_t,
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# and then separately fseeko. However, in the future we might have 128-bit filesystems
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# (ZFS), so it might be dangerous to indiscriminately set e.g. _FILE_OFFSET_BITS=64.
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MESSAGE(STATUS "Checking for 64-bit off_t")
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# First check without any special flags
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TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}"
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"${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c")
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if(FILE64_OK)
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MESSAGE(STATUS "Checking for 64-bit off_t - present")
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endif(FILE64_OK)
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if(NOT FILE64_OK)
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# Test with _FILE_OFFSET_BITS=64
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TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}"
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"${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c"
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COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64" )
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if(FILE64_OK)
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MESSAGE(STATUS "Checking for 64-bit off_t - present with _FILE_OFFSET_BITS=64")
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set(_FILE_OFFSET_BITS 64 CACHE INTERNAL "64-bit off_t requires _FILE_OFFSET_BITS=64")
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endif(FILE64_OK)
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endif(NOT FILE64_OK)
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if(NOT FILE64_OK)
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# Test with _LARGE_FILES
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TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}"
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"${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c"
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COMPILE_DEFINITIONS "-D_LARGE_FILES" )
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if(FILE64_OK)
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MESSAGE(STATUS "Checking for 64-bit off_t - present with _LARGE_FILES")
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set(_LARGE_FILES 1 CACHE INTERNAL "64-bit off_t requires _LARGE_FILES")
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endif(FILE64_OK)
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endif(NOT FILE64_OK)
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if(NOT FILE64_OK)
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# Test with _LARGEFILE_SOURCE
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TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}"
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"${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c"
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COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" )
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if(FILE64_OK)
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MESSAGE(STATUS "Checking for 64-bit off_t - present with _LARGEFILE_SOURCE")
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set(_LARGEFILE_SOURCE 1 CACHE INTERNAL "64-bit off_t requires _LARGEFILE_SOURCE")
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endif(FILE64_OK)
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endif(NOT FILE64_OK)
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if(NOT FILE64_OK)
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# now check for Windows stuff
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TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}"
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"${CMAKE_SOURCE_DIR}/cmake/TestWindowsFSeek.c")
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if(FILE64_OK)
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MESSAGE(STATUS "Checking for 64-bit off_t - present with _fseeki64")
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set(HAVE__FSEEKI64 1 CACHE INTERNAL "64-bit off_t requires _fseeki64")
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endif(FILE64_OK)
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endif(NOT FILE64_OK)
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if(NOT FILE64_OK)
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MESSAGE(STATUS "Checking for 64-bit off_t - not present")
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else(NOT FILE64_OK)
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# Set the flags we might have determined to be required above
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configure_file("${CMAKE_SOURCE_DIR}/cmake/TestLargeFiles.c.cmakein"
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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}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c")
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if(FSEEKO_COMPILE_OK)
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MESSAGE(STATUS "Checking for fseeko/ftello - present")
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endif(FSEEKO_COMPILE_OK)
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if(NOT FSEEKO_COMPILE_OK)
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# glibc 2.2 neds _LARGEFILE_SOURCE for fseeko (but not 64-bit off_t...)
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TRY_COMPILE(FSEEKO_COMPILE_OK "${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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endif(FSEEKO_COMPILE_OK)
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endif(NOT FSEEKO_COMPILE_OK)
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endif(NOT FILE64_OK)
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if(FSEEKO_COMPILE_OK)
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SET(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE)
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set(HAVE_FSEEKO 1 CACHE INTERNAL "64bit fseeko is available" FORCE)
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else(FSEEKO_COMPILE_OK)
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if (HAVE__FSEEKI64)
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SET(${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 (HAVE__FSEEKI64)
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MESSAGE(STATUS "Checking for fseeko/ftello - not found")
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SET(${VARIABLE} 0 CACHE INTERNAL "Result of test for large file support" FORCE)
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endif (HAVE__FSEEKI64)
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endif(FSEEKO_COMPILE_OK)
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ENDIF(NOT DEFINED ${VARIABLE})
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ENDMACRO(GMX_TEST_LARGE_FILES VARIABLE)
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