source: trunk/libs/newlib/src/config/intdiv0.m4 @ 679

Last change on this file since 679 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 1.9 KB
Line 
1# intdiv0.m4 serial 1 (gettext-0.11.3)
2dnl Copyright (C) 2002 Free Software Foundation, Inc.
3dnl This file is free software, distributed under the terms of the GNU
4dnl General Public License.  As a special exception to the GNU General
5dnl Public License, this file may be distributed as part of a program
6dnl that contains a configuration script generated by Autoconf, under
7dnl the same distribution terms as the rest of that program.
8
9dnl From Bruno Haible.
10
11AC_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
23static void
24#ifdef __cplusplus
25sigfpe_handler (int sig)
26#else
27sigfpe_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
34int x = 1;
35int y = 0;
36int z;
37int nan;
38
39int 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])
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