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Diffstat (limited to 'config/ulonglong.m4')
| -rw-r--r-- | config/ulonglong.m4 | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/config/ulonglong.m4 b/config/ulonglong.m4 new file mode 100644 index 0000000..1da8b80 --- /dev/null +++ b/config/ulonglong.m4 @@ -0,0 +1,25 @@ +# ulonglong.m4 serial 3 +dnl Copyright (C) 1999-2003 Free Software Foundation, Inc. +dnl This file is free software, distributed under the terms of the GNU +dnl General Public License. As a special exception to the GNU General +dnl Public License, this file may be distributed as part of a program +dnl that contains a configuration script generated by Autoconf, under +dnl the same distribution terms as the rest of that program. + +dnl From Paul Eggert. + +# Define HAVE_UNSIGNED_LONG_LONG if 'unsigned long long' works. + +AC_DEFUN([jm_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 +]) |