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