1# intdiv0.m4 serial 1 (gettext-0.11.3)
2dnl Copyright (C) 2002 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl From Bruno Haible.
8
9AC_DEFUN([gt_INTDIV0],
10[
11  AC_REQUIRE([AC_PROG_CC])dnl
12  AC_REQUIRE([AC_CANONICAL_HOST])dnl
13
14  AC_CACHE_CHECK([whether integer division by zero raises SIGFPE],
15    gt_cv_int_divbyzero_sigfpe,
16    [
17      AC_TRY_RUN([
18#include <stdlib.h>
19#include <signal.h>
20
21static void
22#ifdef __cplusplus
23sigfpe_handler (int sig)
24#else
25sigfpe_handler (sig) int sig;
26#endif
27{
28  /* Exit with code 0 if SIGFPE, with code 1 if any other signal.  */
29  exit (sig != SIGFPE);
30}
31
32int x = 1;
33int y = 0;
34int z;
35int nan;
36
37int main ()
38{
39  signal (SIGFPE, sigfpe_handler);
40/* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP.  */
41#if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
42  signal (SIGTRAP, sigfpe_handler);
43#endif
44/* Linux/SPARC yields signal SIGILL.  */
45#if defined (__sparc__) && defined (__linux__)
46  signal (SIGILL, sigfpe_handler);
47#endif
48
49  z = x / y;
50  nan = y / y;
51  exit (1);
52}
53], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no,
54        [
55          # Guess based on the CPU.
56          case "$host_cpu" in
57            alpha* | i[34567]86 | m68k | s390*)
58              gt_cv_int_divbyzero_sigfpe="guessing yes";;
59            *)
60              gt_cv_int_divbyzero_sigfpe="guessing no";;
61          esac
62        ])
63    ])
64  case "$gt_cv_int_divbyzero_sigfpe" in
65    *yes) value=1;;
66    *) value=0;;
67  esac
68  AC_DEFINE_UNQUOTED(INTDIV0_RAISES_SIGFPE, $value,
69    [Define if integer division by zero raises signal SIGFPE.])
70])
71