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comparison config/intdiv0.m4 @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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-1:000000000000 0:a06113de4d67
1 # intdiv0.m4 serial 1 (gettext-0.11.3)
2 dnl Copyright (C) 2002 Free Software Foundation, Inc.
3 dnl This file is free software, distributed under the terms of the GNU
4 dnl General Public License. As a special exception to the GNU General
5 dnl Public License, this file may be distributed as part of a program
6 dnl that contains a configuration script generated by Autoconf, under
7 dnl the same distribution terms as the rest of that program.
8
9 dnl From Bruno Haible.
10
11 AC_DEFUN([gt_INTDIV0],
12 [
13 AC_REQUIRE([AC_PROG_CC])dnl
14 AC_REQUIRE([AC_CANONICAL_HOST])dnl
15
16 AC_CACHE_CHECK([whether integer division by zero raises SIGFPE],
17 gt_cv_int_divbyzero_sigfpe,
18 [
19 AC_TRY_RUN([
20 #include <stdlib.h>
21 #include <signal.h>
22
23 static void
24 #ifdef __cplusplus
25 sigfpe_handler (int sig)
26 #else
27 sigfpe_handler (sig) int sig;
28 #endif
29 {
30 /* Exit with code 0 if SIGFPE, with code 1 if any other signal. */
31 exit (sig != SIGFPE);
32 }
33
34 int x = 1;
35 int y = 0;
36 int z;
37 int nan;
38
39 int main ()
40 {
41 signal (SIGFPE, sigfpe_handler);
42 /* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP. */
43 #if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
44 signal (SIGTRAP, sigfpe_handler);
45 #endif
46 /* Linux/SPARC yields signal SIGILL. */
47 #if defined (__sparc__) && defined (__linux__)
48 signal (SIGILL, sigfpe_handler);
49 #endif
50
51 z = x / y;
52 nan = y / y;
53 exit (1);
54 }
55 ], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no,
56 [
57 # Guess based on the CPU.
58 case "$host_cpu" in
59 alpha* | i[34567]86 | m68k | s390*)
60 gt_cv_int_divbyzero_sigfpe="guessing yes";;
61 *)
62 gt_cv_int_divbyzero_sigfpe="guessing no";;
63 esac
64 ])
65 ])
66 case "$gt_cv_int_divbyzero_sigfpe" in
67 *yes) value=1;;
68 *) value=0;;
69 esac
70 AC_DEFINE_UNQUOTED(INTDIV0_RAISES_SIGFPE, $value,
71 [Define if integer division by zero raises signal SIGFPE.])
72 ])