From e5a9dcb9d8863fc2ad44c4f85a10a95329e3c154 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 28 Jun 2003 03:29:00 +0000
Subject: * configure.in (rb_cv_stack_grow_dir): check stack growing direction.

* eval.c (rb_thread_restore_context): prior configuration macro.

* gc.c (ruby_stack_length): always return the address of lower edge.

* gc.c (rb_gc_mark_locations): remove margin.  [ruby-dev:20462]

* gc.c (rb_gc, Init_stack): prior configuration macro.

* gc.c (Init_stack): add safety margin.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4012 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 configure.in | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'configure.in')

diff --git a/configure.in b/configure.in
index ec6abaef71..cebfc766b0 100644
--- a/configure.in
+++ b/configure.in
@@ -616,6 +616,30 @@ if test "$rb_cv_need_io_flush_before_seek" = yes; then
   AC_DEFINE(NEED_IO_FLUSH_BEFORE_SEEK, 1)
 fi
 
+case "$target_cpu" in
+m68*|i?86|sparc) rb_cv_stack_grow_dir=-1;;
+esac
+AC_CACHE_CHECK(stack growing direction, rb_cv_stack_grow_dir,
+  [AC_TRY_RUN([
+/* recurse to get rid of inlining */
+static int
+stack_growup_p(addr, n)
+    volatile int *addr, n;
+{
+    volatile int end;
+    if (n > 0)
+	return *addr = stack_growup_p(addr, n - 1);
+    else
+	return (&end > addr);
+}
+int main()
+{
+    int x;
+    return stack_growup_p(&x, 10);
+}
+], rb_cv_stack_grow_dir=-1, rb_cv_stack_grow_dir=+1, rb_cv_stack_grow_dir=0)])
+AC_DEFINE_UNQUOTED(STACK_GROW_DIRECTION, $rb_cv_stack_grow_dir)
+
 dnl default value for $KANJI
 DEFAULT_KCODE="KCODE_NONE"
 
-- 
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