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-rw-r--r--gl/m4/intdiv0.m487
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1# intdiv0.m4 serial 6 (gettext-0.18.2)
2dnl Copyright (C) 2002, 2007-2008, 2010-2013 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 "$host_os" in
20 macos* | darwin[6-9]* | darwin[1-9][0-9]*)
21 # On Mac OS X 10.2 or newer, just assume the same as when cross-
22 # compiling. If we were to perform the real test, 1 Crash Report
23 # dialog window would pop up.
24 case "$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 "$gt_cv_int_divbyzero_sigfpe"; then
32 AC_RUN_IFELSE(
33 [AC_LANG_SOURCE([[
34#include <stdlib.h>
35#include <signal.h>
36
37static void
38sigfpe_handler (int sig)
39{
40 /* Exit with code 0 if SIGFPE, with code 1 if any other signal. */
41 exit (sig != SIGFPE);
42}
43
44int x = 1;
45int y = 0;
46int z;
47int nan;
48
49int main ()
50{
51 signal (SIGFPE, sigfpe_handler);
52/* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP. */
53#if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
54 signal (SIGTRAP, sigfpe_handler);
55#endif
56/* Linux/SPARC yields signal SIGILL. */
57#if defined (__sparc__) && defined (__linux__)
58 signal (SIGILL, sigfpe_handler);
59#endif
60
61 z = x / y;
62 nan = y / y;
63 exit (2);
64}
65]])],
66 [gt_cv_int_divbyzero_sigfpe=yes],
67 [gt_cv_int_divbyzero_sigfpe=no],
68 [
69 # Guess based on the CPU.
70changequote(,)dnl
71 case "$host_cpu" in
72 alpha* | i[34567]86 | x86_64 | m68k | s390*)
73 gt_cv_int_divbyzero_sigfpe="guessing yes";;
74 *)
75 gt_cv_int_divbyzero_sigfpe="guessing no";;
76 esac
77changequote([,])dnl
78 ])
79 fi
80 ])
81 case "$gt_cv_int_divbyzero_sigfpe" in
82 *yes) value=1;;
83 *) value=0;;
84 esac
85 AC_DEFINE_UNQUOTED([INTDIV0_RAISES_SIGFPE], [$value],
86 [Define if integer division by zero raises signal SIGFPE.])
87])