From 62bc1072c19e81bb0f9e42a5034e7ab8c27d3b94 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Sun, 1 Jul 2012 17:32:03 +0200
Subject: [PATCH] Fix stack growth direction check.

Backport of 236f901b0e2b18093421e2e440cf80d00fb98757 from `stable-2.0'.
Fixes <http://bugs.gnu.org/11845>.
Reported by Cyprien Nicolas <c.nicolas@gmail.com>.

* configure.in: Pull stack growth direction check from upstream
  Autoconf.  See
  http://lists.gnu.org/archive/html/bug-autoconf/2011-06/msg00035.html
  for a discussion.
---
 configure.in | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/configure.in b/configure.in
index f0588417f..682e31f51 100644
--- a/configure.in
+++ b/configure.in
@@ -1244,23 +1244,20 @@ SCM_I_GSC_STACK_GROWS_UP=0
 AC_RUN_IFELSE([AC_LANG_SOURCE(
 [AC_INCLUDES_DEFAULT
 int
-find_stack_direction ()
+find_stack_direction (int *addr, int depth)
 {
-  static char *addr = 0;
-  auto char dummy;
-  if (addr == 0)
-    {
-      addr = &dummy;
-      return find_stack_direction ();
-    }
-  else
-    return (&dummy > addr) ? 1 : -1;
+  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 ()
+main (int argc, char **argv)
 {
-  return find_stack_direction () < 0;
+  return find_stack_direction (0, argc + !argv + 20) < 0;
 }])],
 	       [SCM_I_GSC_STACK_GROWS_UP=1],
 	       [],