1# ulonglong.m4 serial 4
2dnl Copyright (C) 1999-2004 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl From Paul Eggert.
8
9# Define HAVE_UNSIGNED_LONG_LONG if 'unsigned long long' works.
10
11AC_DEFUN([gl_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 = 1ULL; 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])
24