cln_mirror/m4/longlong.m4

dnl -*- Autoconf -*-
dnl Copyright (C) 1993-2006 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 Bruno Haible, Marcus Daniels, Sam Steingold, Paul Eggert.

AC_PREREQ(2.57)

AC_DEFUN([CL_LONGLONG],
[AC_CACHE_CHECK(for long long type, cl_cv_c_longlong, [
AC_TRY_RUN([
#include <stdlib.h>
int main()
{
/* long longs don't work right with gcc-2.7.2 on m68k */
/* long longs don't work right with gcc-2.7.2 on rs6000: avcall/tests.c gets
   miscompiled. */
#if defined(__m68k__) || (defined(_IBMR2) || defined(__powerpc))
#if defined(__GNUC__) && (__GNUC__ == 2) && (__GNUC_MINOR__ <= 7)
  exit(1);
#endif
#endif
  { long x = 944938507; long y = 737962842; long z = 162359677;
    exit(!(((long long) x)*((long long) y)>>32 == z));
  }
}],
cl_cv_c_longlong=yes, cl_cv_c_longlong=no, [
dnl When cross-compiling, use the test from gnulib.
AC_TRY_LINK([long long ll = 1LL; int i = 63;],
  [long long llmax = (long long) -1;
   return ll << i | ll >> i | llmax / ll | llmax % ll;],
  cl_cv_c_longlong=yes,
  cl_cv_c_longlong=no)])
])
if test $cl_cv_c_longlong = yes; then
  AC_DEFINE(HAVE_LONGLONG,,[compiler supports the `long long' type])
fi
])