1# intdiv0.m4 serial 2 (gettext-0.17)
2dnl Copyright (C) 2002, 2007 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      gt_cv_int_divbyzero_sigfpe=
18changequote(,)dnl
19      case "$host_os" in
20        macos* | darwin[6-9]* | darwin[1-9][0-9]*)
21          # On MacOS X 10.2 or newer, just assume the same as when cross-
22          # compiling. If we were to perform the real test, 1 Crash Report
23          # dialog window would pop up.
24          case "$host_cpu" in
25            i[34567]86 | x86_64)
26              gt_cv_int_divbyzero_sigfpe="guessing yes" ;;
27          esac
28          ;;
29      esac
30changequote([,])dnl
31      if test -z "$gt_cv_int_divbyzero_sigfpe"; then
32        AC_TRY_RUN([
33#include <stdlib.h>
34#include <signal.h>
35
36static void
37sigfpe_handler (int sig)
38{
39  /* Exit with code 0 if SIGFPE, with code 1 if any other signal.  */
40  exit (sig != SIGFPE);
41}
42
43int x = 1;
44int y = 0;
45int z;
46int nan;
47
48int main ()
49{
50  signal (SIGFPE, sigfpe_handler);
51/* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP.  */
52#if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
53  signal (SIGTRAP, sigfpe_handler);
54#endif
55/* Linux/SPARC yields signal SIGILL.  */
56#if defined (__sparc__) && defined (__linux__)
57  signal (SIGILL, sigfpe_handler);
58#endif
59
60  z = x / y;
61  nan = y / y;
62  exit (1);
63}
64], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no,
65          [
66            # Guess based on the CPU.
67changequote(,)dnl
68            case "$host_cpu" in
69              alpha* | i[34567]86 | x86_64 | m68k | s390*)
70                gt_cv_int_divbyzero_sigfpe="guessing yes";;
71              *)
72                gt_cv_int_divbyzero_sigfpe="guessing no";;
73            esac
74changequote([,])dnl
75          ])
76      fi
77    ])
78  case "$gt_cv_int_divbyzero_sigfpe" in
79    *yes) value=1;;
80    *) value=0;;
81  esac
82  AC_DEFINE_UNQUOTED(INTDIV0_RAISES_SIGFPE, $value,
83    [Define if integer division by zero raises signal SIGFPE.])
84])
85