aboutsummaryrefslogtreecommitdiff
path: root/m4/intdiv0.m4
diff options
context:
space:
mode:
Diffstat (limited to 'm4/intdiv0.m4')
-rw-r--r--m4/intdiv0.m484
1 files changed, 84 insertions, 0 deletions
diff --git a/m4/intdiv0.m4 b/m4/intdiv0.m4
new file mode 100644
index 00000000..289c4df5
--- /dev/null
+++ b/m4/intdiv0.m4
@@ -0,0 +1,84 @@
1# intdiv0.m4 serial 3 (gettext-0.18)
2dnl Copyright (C) 2002, 2007-2010 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])