1# ulonglong.m4 serial 3
2dnl Copyright (C) 1999-2003 Free Software Foundation, Inc.
3dnl This file is free software, distributed under the terms of the GNU
4dnl General Public License.  As a special exception to the GNU General
5dnl Public License, this file may be distributed as part of a program
6dnl that contains a configuration script generated by Autoconf, under
7dnl the same distribution terms as the rest of that program.
8
9dnl From Paul Eggert.
10
11# Define HAVE_UNSIGNED_LONG_LONG if 'unsigned long long' works.
12
13AC_DEFUN([jm_AC_TYPE_UNSIGNED_LONG_LONG],
14[
15  AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long,
16  [AC_TRY_LINK([unsigned long long ull = 1ULL; int i = 63;],
17    [unsigned long long ullmax = (unsigned long long) -1;
18     return ull << i | ull >> i | ullmax / ull | ullmax % ull;],
19    ac_cv_type_unsigned_long_long=yes,
20    ac_cv_type_unsigned_long_long=no)])
21  if test $ac_cv_type_unsigned_long_long = yes; then
22    AC_DEFINE(HAVE_UNSIGNED_LONG_LONG, 1,
23      [Define if you have the 'unsigned long long' type.])
24  fi
25])
26