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# stack-direction.m4 serial 7
dnl Copyright (C) 2002-2021 Free Software Foundation, Inc.
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.
dnl Written by Bruno Haible.
# Determine the stack direction. Define the C macro STACK_DIRECTION.
AC_DEFUN([SV_STACK_DIRECTION],
[
AC_REQUIRE([AC_CANONICAL_HOST])
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 | \
aarch64* | \
alpha* | \
arc | \
arm* | strongarm* | xscale* | \
avr | avr32 | \
bfin | \
c1 | c2 | c32 | c34 | c38 | \
clipper | \
cris | \
d30v | \
elxsi | \
fr30 | \
h8300 | \
i?86 | x86_64 | \
i860 | \
ia64 | \
m32r | \
m68* | \
m88k | \
mcore | \
microblaze | \
mips* | \
mmix | \
mn10200 | \
mn10300 | \
nios2 | \
nds32* | \
ns32k | \
pdp11 | \
pj* | \
powerpc* | rs6000 | \
riscv* | \
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
find_stack_direction (int *addr, int depth)
{
int dir, dummy = 0;
if (! addr)
addr = &dummy;
*addr = addr < &dummy ? 1 : addr == &dummy ? 0 : -1;
dir = depth ? find_stack_direction (addr, depth - 1) : 0;
return dir + dummy;
}
int
main (int argc, char *argv[])
{
printf ("%d\n", find_stack_direction (NULL, argc + 20));
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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