# intdiv0.m4 serial 2 (gettext-0.17)

dnl Copyright (C) 2002, 2007 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

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,

    [

      gt_cv_int_divbyzero_sigfpe=

changequote(,)dnl

      case "$host_os" in

        macos* | darwin[6-9]* | darwin[1-9][0-9]*)

          # On MacOS X 10.2 or newer, just assume the same as when cross-

          # compiling. If we were to perform the real test, 1 Crash Report

          # dialog window would pop up.

          case "$host_cpu" in

            i[34567]86 | x86_64)

              gt_cv_int_divbyzero_sigfpe="guessing yes" ;;

          esac

          ;;

      esac

changequote([,])dnl

      if test -z "$gt_cv_int_divbyzero_sigfpe"; then

        AC_TRY_RUN([

#include <stdlib.h>

#include <signal.h>

static void

sigfpe_handler (int sig)

{

  /* 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.

changequote(,)dnl

            case "$host_cpu" in

              alpha* | i[34567]86 | x86_64 | m68k | s390*)

                gt_cv_int_divbyzero_sigfpe="guessing yes";;

              *)

                gt_cv_int_divbyzero_sigfpe="guessing no";;

            esac

changequote([,])dnl

          ])

      fi

    ])

  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.])

])