1*10d565efSmrg# intdiv0.m4 serial 1 (gettext-0.11.3)
2*10d565efSmrgdnl Copyright (C) 2002 Free Software Foundation, Inc.
3*10d565efSmrgdnl This file is free software, distributed under the terms of the GNU
4*10d565efSmrgdnl General Public License.  As a special exception to the GNU General
5*10d565efSmrgdnl Public License, this file may be distributed as part of a program
6*10d565efSmrgdnl that contains a configuration script generated by Autoconf, under
7*10d565efSmrgdnl the same distribution terms as the rest of that program.
8*10d565efSmrg
9*10d565efSmrgdnl From Bruno Haible.
10*10d565efSmrg
11*10d565efSmrgAC_DEFUN([gt_INTDIV0],
12*10d565efSmrg[
13*10d565efSmrg  AC_REQUIRE([AC_PROG_CC])dnl
14*10d565efSmrg  AC_REQUIRE([AC_CANONICAL_HOST])dnl
15*10d565efSmrg
16*10d565efSmrg  AC_CACHE_CHECK([whether integer division by zero raises SIGFPE],
17*10d565efSmrg    gt_cv_int_divbyzero_sigfpe,
18*10d565efSmrg    [
19*10d565efSmrg      AC_TRY_RUN([
20*10d565efSmrg#include <stdlib.h>
21*10d565efSmrg#include <signal.h>
22*10d565efSmrg
23*10d565efSmrgstatic void
24*10d565efSmrg#ifdef __cplusplus
25*10d565efSmrgsigfpe_handler (int sig)
26*10d565efSmrg#else
27*10d565efSmrgsigfpe_handler (sig) int sig;
28*10d565efSmrg#endif
29*10d565efSmrg{
30*10d565efSmrg  /* Exit with code 0 if SIGFPE, with code 1 if any other signal.  */
31*10d565efSmrg  exit (sig != SIGFPE);
32*10d565efSmrg}
33*10d565efSmrg
34*10d565efSmrgint x = 1;
35*10d565efSmrgint y = 0;
36*10d565efSmrgint z;
37*10d565efSmrgint nan;
38*10d565efSmrg
39*10d565efSmrgint main ()
40*10d565efSmrg{
41*10d565efSmrg  signal (SIGFPE, sigfpe_handler);
42*10d565efSmrg/* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP.  */
43*10d565efSmrg#if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
44*10d565efSmrg  signal (SIGTRAP, sigfpe_handler);
45*10d565efSmrg#endif
46*10d565efSmrg/* Linux/SPARC yields signal SIGILL.  */
47*10d565efSmrg#if defined (__sparc__) && defined (__linux__)
48*10d565efSmrg  signal (SIGILL, sigfpe_handler);
49*10d565efSmrg#endif
50*10d565efSmrg
51*10d565efSmrg  z = x / y;
52*10d565efSmrg  nan = y / y;
53*10d565efSmrg  exit (1);
54*10d565efSmrg}
55*10d565efSmrg], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no,
56*10d565efSmrg        [
57*10d565efSmrg          # Guess based on the CPU.
58*10d565efSmrg          case "$host_cpu" in
59*10d565efSmrg            alpha* | i[34567]86 | m68k | s390*)
60*10d565efSmrg              gt_cv_int_divbyzero_sigfpe="guessing yes";;
61*10d565efSmrg            *)
62*10d565efSmrg              gt_cv_int_divbyzero_sigfpe="guessing no";;
63*10d565efSmrg          esac
64*10d565efSmrg        ])
65*10d565efSmrg    ])
66*10d565efSmrg  case "$gt_cv_int_divbyzero_sigfpe" in
67*10d565efSmrg    *yes) value=1;;
68*10d565efSmrg    *) value=0;;
69*10d565efSmrg  esac
70*10d565efSmrg  AC_DEFINE_UNQUOTED(INTDIV0_RAISES_SIGFPE, $value,
71*10d565efSmrg    [Define if integer division by zero raises signal SIGFPE.])
72*10d565efSmrg])
73