| Adam Tkac | fc4cd71 | 2009-03-11 11:14:37 +0000 | [diff] [blame^] | 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 | ]) |