diff --git a/cmake/TestFileOffsetBits.c b/cmake/TestFileOffsetBits.c new file mode 100644 index 0000000000..9a9dcfd182 --- /dev/null +++ b/cmake/TestFileOffsetBits.c @@ -0,0 +1,17 @@ +/* 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. + */ + +#include + +int main(int argc, char **argv) +{ + /* Cause a compile-time error if off_t is smaller than 64 bits */ +#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62)) + int off_t_is_large[ (LARGE_OFF_T % 2147483629 == 721 && LARGE_OFF_T % 2147483647 == 1) ? 1 : -1 ]; + return 0; +} + diff --git a/cmake/TestLargeFiles.c.cmakein b/cmake/TestLargeFiles.c.cmakein new file mode 100644 index 0000000000..53a1f614e6 --- /dev/null +++ b/cmake/TestLargeFiles.c.cmakein @@ -0,0 +1,31 @@ +/* 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. + */ + +#cmakedefine _LARGEFILE_SOURCE +#cmakedefine _LARGEFILE64_SOURCE +#cmakedefine _LARGE_FILES +#cmakedefine _FILE_OFFSET_BITS @_FILE_OFFSET_BITS@ + +#include +#include +#include + +int main(int argc, char **argv) +{ + /* Cause a compile-time error if off_t is smaller than 64 bits, + * and make sure we have ftello / fseeko. + */ +#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62)) + int off_t_is_large[ (LARGE_OFF_T % 2147483629 == 721 && LARGE_OFF_T % 2147483647 == 1) ? 1 : -1 ]; + FILE *fp = fopen(argv[0],"r"); + off_t offset = ftello( fp ); + + fseeko( fp, offset, SEEK_CUR ); + fclose(fp); + return 0; +} + diff --git a/cmake/modules/gmxTestLargeFiles.cmake b/cmake/modules/gmxTestLargeFiles.cmake new file mode 100644 index 0000000000..e7593e9924 --- /dev/null +++ b/cmake/modules/gmxTestLargeFiles.cmake @@ -0,0 +1,125 @@ +# 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 off_t is 64 bits, and fseeko/ftello present. +# This macro will also set defines necessary 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}" + "${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c") + if(FILE64_OK) + MESSAGE(STATUS "Checking for 64-bit off_t - present") + endif(FILE64_OK) + + if(NOT FILE64_OK) + # Test with _FILE_OFFSET_BITS=64 + TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}" + "${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c" + COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64" ) + if(FILE64_OK) + MESSAGE(STATUS "Checking for 64-bit off_t - present with _FILE_OFFSET_BITS=64") + set(_FILE_OFFSET_BITS 64 CACHE INTERNAL "64-bit off_t requires _FILE_OFFSET_BITS=64") + endif(FILE64_OK) + endif(NOT FILE64_OK) + + if(NOT FILE64_OK) + # Test with _LARGE_FILES + TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}" + "${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c" + COMPILE_DEFINITIONS "-D_LARGE_FILES" ) + if(FILE64_OK) + MESSAGE(STATUS "Checking for 64-bit off_t - present with _LARGE_FILES") + set(_LARGE_FILES 1 CACHE INTERNAL "64-bit off_t requires _LARGE_FILES") + endif(FILE64_OK) + endif(NOT FILE64_OK) + + if(NOT FILE64_OK) + # Test with _LARGEFILE_SOURCE + TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}" + "${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c" + COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" ) + if(FILE64_OK) + MESSAGE(STATUS "Checking for 64-bit off_t - present with _LARGEFILE_SOURCE") + set(_LARGEFILE_SOURCE 1 CACHE INTERNAL "64-bit off_t requires _LARGEFILE_SOURCE") + endif(FILE64_OK) + endif(NOT FILE64_OK) + + if(NOT FILE64_OK) + # now check for Windows stuff + TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}" + "${CMAKE_SOURCE_DIR}/cmake/TestWindowsFSeek.c") + if(FILE64_OK) + MESSAGE(STATUS "Checking for 64-bit off_t - present with _fseeki64") + set(HAVE__FSEEKI64 1 CACHE INTERNAL "64-bit off_t requires _fseeki64") + endif(FILE64_OK) + endif(NOT FILE64_OK) + + if(NOT FILE64_OK) + MESSAGE(STATUS "Checking for 64-bit off_t - not present") + else(NOT FILE64_OK) + + # Set the flags we might have determined to be required above + configure_file("${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(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE) + set(HAVE_FSEEKO 1 CACHE INTERNAL "64bit fseeko is available" FORCE) + else(FSEEKO_COMPILE_OK) + if (HAVE__FSEEKI64) + SET(${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) + + +