| # ulonglong.m4 serial 4 |
| dnl Copyright (C) 1999-2004 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| dnl From Paul Eggert. |
| |
| # Define HAVE_UNSIGNED_LONG_LONG if 'unsigned long long' works. |
| |
| AC_DEFUN([gl_AC_TYPE_UNSIGNED_LONG_LONG], |
| [ |
| AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long, |
| [AC_TRY_LINK([unsigned long long ull = 1ULL; int i = 63;], |
| [unsigned long long ullmax = (unsigned long long) -1; |
| return ull << i | ull >> i | ullmax / ull | ullmax % ull;], |
| ac_cv_type_unsigned_long_long=yes, |
| ac_cv_type_unsigned_long_long=no)]) |
| if test $ac_cv_type_unsigned_long_long = yes; then |
| AC_DEFINE(HAVE_UNSIGNED_LONG_LONG, 1, |
| [Define if you have the 'unsigned long long' type.]) |
| fi |
| ]) |
