1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
# intdiv0.m4 serial 6 (gettext-0.18.2)
dnl Copyright (C) 2002, 2007-2008, 2010-2017 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl From Bruno Haible.
AC_DEFUN([gt_INTDIV0],
[
AC_REQUIRE([AC_PROG_CC])dnl
AC_REQUIRE([AC_CANONICAL_HOST])dnl
AC_CACHE_CHECK([whether integer division by zero raises SIGFPE],
gt_cv_int_divbyzero_sigfpe,
[
gt_cv_int_divbyzero_sigfpe=
changequote(,)dnl
case "$host_os" in
macos* | darwin[6-9]* | darwin[1-9][0-9]*)
# On Mac OS X 10.2 or newer, just assume the same as when cross-
# compiling. If we were to perform the real test, 1 Crash Report
# dialog window would pop up.
case "$host_cpu" in
i[34567]86 | x86_64)
gt_cv_int_divbyzero_sigfpe="guessing yes" ;;
esac
;;
esac
changequote([,])dnl
if test -z "$gt_cv_int_divbyzero_sigfpe"; then
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <stdlib.h>
#include <signal.h>
static void
sigfpe_handler (int sig)
{
/* Exit with code 0 if SIGFPE, with code 1 if any other signal. */
_exit (sig != SIGFPE);
}
int x = 1;
int y = 0;
int z;
int nan;
int main ()
{
signal (SIGFPE, sigfpe_handler);
/* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP. */
#if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
signal (SIGTRAP, sigfpe_handler);
#endif
/* Linux/SPARC yields signal SIGILL. */
#if defined (__sparc__) && defined (__linux__)
signal (SIGILL, sigfpe_handler);
#endif
z = x / y;
nan = y / y;
exit (2);
}
]])],
[gt_cv_int_divbyzero_sigfpe=yes],
[gt_cv_int_divbyzero_sigfpe=no],
[
# Guess based on the CPU.
changequote(,)dnl
case "$host_cpu" in
alpha* | i[34567]86 | x86_64 | m68k | s390*)
gt_cv_int_divbyzero_sigfpe="guessing yes";;
*)
gt_cv_int_divbyzero_sigfpe="guessing no";;
esac
changequote([,])dnl
])
fi
])
case "$gt_cv_int_divbyzero_sigfpe" in
*yes) value=1;;
*) value=0;;
esac
AC_DEFINE_UNQUOTED([INTDIV0_RAISES_SIGFPE], [$value],
[Define if integer division by zero raises signal SIGFPE.])
])
|
