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Repo Admin 2003-12-09 09:07:09 +00:00
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# 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.])
])