Subversion Repositories openrisc_2011-10-31

# intdiv0.m4 serial 1 (gettext-0.11.3)

dnl Copyright (C) 2002 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.

AC_DEFUN([gt_INTDIV0],

[

  AC_REQUIRE([AC_PROG_CC])dnl

  AC_REQUIRE([AC_CANONICAL_HOST])dnl

  AC_CACHE_CHECK([whether integer division by zero raises SIGFPE],

    gt_cv_int_divbyzero_sigfpe,

    [

      AC_TRY_RUN([

#include <stdlib.h>

#include <signal.h>

static void

#ifdef __cplusplus

sigfpe_handler (int sig)

#else

sigfpe_handler (sig) int sig;

#endif

{

  /* Exit with code 0 if SIGFPE, with code 1 if any other signal.  */

  exit (sig != SIGFPE);

}

int x = 1;

int y = 0;

int z;

int nan;

int main ()

{

  signal (SIGFPE, sigfpe_handler);

/* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP.  */

#if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)

  signal (SIGTRAP, sigfpe_handler);

#endif

/* Linux/SPARC yields signal SIGILL.  */

#if defined (__sparc__) && defined (__linux__)

  signal (SIGILL, sigfpe_handler);

#endif

  z = x / y;

  nan = y / y;

  exit (1);

}

], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no,

        [

          # Guess based on the CPU.

          case "$host_cpu" in

            alpha* | i[34567]86 | m68k | s390*)

              gt_cv_int_divbyzero_sigfpe="guessing yes";;

            *)

              gt_cv_int_divbyzero_sigfpe="guessing no";;

          esac

        ])

    ])

  case "$gt_cv_int_divbyzero_sigfpe" in

    *yes) value=1;;

    *) value=0;;

  esac

  AC_DEFINE_UNQUOTED(INTDIV0_RAISES_SIGFPE, $value,

    [Define if integer division by zero raises signal SIGFPE.])

])