1# longlong.m4 serial 4
2dnl Copyright (C) 1999-2003 Free Software Foundation, Inc.
3dnl This file is free software, distributed under the terms of the GNU
4dnl General Public License.  As a special exception to the GNU General
5dnl Public License, this file may be distributed as part of a program
6dnl that contains a configuration script generated by Autoconf, under
7dnl the same distribution terms as the rest of that program.
8
9dnl From Paul Eggert.
10
11# Define HAVE_LONG_LONG if 'long long' works.
12
13AC_DEFUN([jm_AC_TYPE_LONG_LONG],
14[
15  AC_CACHE_CHECK([for long long], ac_cv_type_long_long,
16  [AC_TRY_LINK([long long ll = 1LL; int i = 63;],
17    [long long llmax = (long long) -1;
18     return ll << i | ll >> i | llmax / ll | llmax % ll;],
19    ac_cv_type_long_long=yes,
20    ac_cv_type_long_long=no)])
21  if test $ac_cv_type_long_long = yes; then
22    AC_DEFINE(HAVE_LONG_LONG, 1,
23      [Define if you have the 'long long' type.])
24  fi
25])
26