1 # ulonglong.m4 serial 3 2 dnl Copyright (C) 1999-2003 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 # Define HAVE_UNSIGNED_LONG_LONG if 'unsigned long long' works. 12 13 AC_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
