Dogcows Code - chaz/openbox/blob - m4/ulonglong.m4

   1 # ulonglong.m4 serial 2 (fileutils-4.0.32, gettext-0.10.40)
   2 dnl Copyright (C) 1999-2002 Free Software Foundation, Inc.
   3 dnl This file is free software, distributed under the terms of the GNU
   4 dnl General Public License.  As a special exception to the GNU General
   5 dnl Public License, this file may be distributed as part of a program
   6 dnl that contains a configuration script generated by Autoconf, under
   7 dnl the same distribution terms as the rest of that program.
   8
   9 dnl From Paul Eggert.
  10
  11 AC_DEFUN([jm_AC_TYPE_UNSIGNED_LONG_LONG],
  12 [
  13   AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long,
  14   [AC_TRY_LINK([unsigned long long ull = 1; int i = 63;],
  15     [unsigned long long ullmax = (unsigned long long) -1;
  16      return ull << i | ull >> i | ullmax / ull | ullmax % ull;],
  17     ac_cv_type_unsigned_long_long=yes,
  18     ac_cv_type_unsigned_long_long=no)])
  19   if test $ac_cv_type_unsigned_long_long = yes; then
  20     AC_DEFINE(HAVE_UNSIGNED_LONG_LONG, 1,
  21       [Define if you have the unsigned long long type.])
  22   fi
  23 ])