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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])