ulonglong_gl.m4   [plain text]

# ulonglong.m4 serial 4
dnl Copyright (C) 1999-2004 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_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;],
  if test $ac_cv_type_unsigned_long_long = yes; then
      [Define if you have the 'unsigned long long' type.])