1 # longlong.m4 serial 4 2 dnl Copyright (C) 1999-2003 Free Software Foundation, Inc. 3 dnl This file is free software, distributed under the terms of the GNU 4 dnl General Public License. As a special exception to the GNU General 5 dnl Public License, this file may be distributed as part of a program 6 dnl that contains a configuration script generated by Autoconf, under 7 dnl the same distribution terms as the rest of that program. 8 9 dnl From Paul Eggert. 10 11 # Define HAVE_LONG_LONG if 'long long' works. 12 13 AC_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
