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# stack-direction.m4 serial 1 (libsigsegv-2.8)
dnl Copyright (C) 2002-2009 Bruno Haible <bruno@clisp.org>
dnl This file is free software, distributed under the terms of the GNU
dnl General Public License. As a special exception to the GNU General
dnl Public License, this file may be distributed as part of a program
dnl that contains a configuration script generated by Autoconf, under
dnl the same distribution terms as the rest of that program.
# Determine the stack direction. Define the C macro STACK_DIRECTION.
AC_DEFUN([SV_STACK_DIRECTION],
[
AC_CACHE_CHECK([for stack direction], [sv_cv_stack_direction_msg], [
case "$host_cpu" in
dnl See the #define STACK_GROWS_DOWNWARD in gcc-3.1/gcc/config/*/*.h.
a29k | \
alpha* | \
arc | \
aarch64 | arm* | strongarm* | xscale* | \
avr | \
c1 | c2 | c32 | c34 | c38 | \
clipper | \
cris | \
d30v | \
elxsi | \
fr30 | \
h8300 | \
i?86 | x86_64 | \
i860 | \
ia64 | \
m32r | \
m68* | \
m88k | \
mcore | \
mips* | \
mmix | \
mn10200 | \
mn10300 | \
ns32k | \
pdp11 | \
pj* | \
powerpc* | rs6000 | \
romp | \
s390* | \
sh* | \
sparc* | \
v850 | \
vax | \
xtensa)
sv_cv_stack_direction=-1 ;;
c4x | \
dsp16xx | \
i960 | \
hppa* | parisc* | \
stormy16 | \
we32k)
sv_cv_stack_direction=1 ;;
*)
if test $cross_compiling = no; then
cat > conftest.c <<EOF
#include <stdio.h>
int
get_stack_direction ()
{
auto char dummy;
static char *dummyaddr = (char *)0;
if (dummyaddr != (char *)0)
return &dummy > dummyaddr ? 1 : &dummy < dummyaddr ? -1 : 0;
else
{
dummyaddr = &dummy;
{
int result = get_stack_direction ();
/* The next assignment avoids tail recursion elimination
(IRIX 6.4 CC). */
dummyaddr = (char *)0;
return result;
}
}
}
int
main ()
{
printf ("%d\n", get_stack_direction ());
return 0;
}
EOF
AC_TRY_EVAL([ac_link])
sv_cv_stack_direction=`./conftest`
else
sv_cv_stack_direction=0
fi
;;
esac
case $sv_cv_stack_direction in
1) sv_cv_stack_direction_msg="grows up";;
-1) sv_cv_stack_direction_msg="grows down";;
*) sv_cv_stack_direction_msg="unknown";;
esac
])
AC_DEFINE_UNQUOTED([STACK_DIRECTION], [$sv_cv_stack_direction],
[Define as the direction of stack growth for your system.
STACK_DIRECTION > 0 => grows toward higher addresses
STACK_DIRECTION < 0 => grows toward lower addresses
STACK_DIRECTION = 0 => spaghetti stack.])
])
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