m4/large-file.m4

   1 AC_DEFUN([MOONLIGHT_CHECK_LARGE_FILE],
   2 [
   3         AC_SYS_LARGEFILE
   4         AC_CACHE_CHECK([whether _LARGEFILE64_SOURCE needs to be defined for large files], moon_cv_largefile64_source, [
   5                 AC_TRY_COMPILE([
   6                         #include <sys/types.h>
   7                         #include <sys/stat.h>
   8                         #include <fcntl.h>
   9                 ],[
  10                         int fd = open ("__o_largefile", O_CREAT | O_RDWR | O_LARGEFILE, 0644);
  11                 ],[
  12                         moon_cv_largefile64_source="no"
  13                 ],[
  14                         AC_TRY_COMPILE([
  15                                 #define _LARGEFILE64_SOURCE 1
  16                                 #include <sys/types.h>
  17                                 #include <sys/stat.h>
  18                                 #include <fcntl.h>
  19                         ],[
  20                                 int fd = open ("__o_largefile", O_CREAT | O_RDWR | O_LARGEFILE, 0644);
  21                         ],[
  22                                 moon_cv_largefile64_source="yes"
  23                         ],[
  24                                 moon_cv_largefile64_source="unknown (large files may not be supported)"
  25                         ])
  26                 ])
  27         ])
  28
  29         if test "x$largefile64_source" = "xyes"; then
  30                 LARGEFILE_CFLAGS="-D_LARGEFILE64_SOURCE=1"
  31         elif test "x$largefile64_source" = "xundefined"; then
  32                 AC_DEFINE(O_LARGEFILE, 0, [Define to 0 if your system does not have the O_LARGEFILE flag])
  33         fi
  34
  35         if test -n "$ac_cv_sys_large_files" -a "x$ac_cv_sys_large_files" != "xno"; then
  36                 LARGEFILE_CFLAGS="$LARGEFILE_CFLAGS -D_LARGE_FILES=1"
  37         fi
  38
  39         if test "x$ac_cv_sys_file_offset_bits" != "xno"; then
  40                 LARGEFILE_CFLAGS="$LARGEFILE_CFLAGS -D_FILE_OFFSET_BITS=$ac_cv_sys_file_offset_bits"
  41         fi
  42 ])