prevent rb_cObject from GC

* class.c (Init_class_hierarchy): prevent rb_cObject which is the
  class tree root, from GC.  [ruby-dev:49666] [Bug #12492]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55429 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/class.c b/class.c
index 1215b6d93d..6b818a326f 100644
--- a/class.c
+++ b/class.c
@@ -547,6 +547,7 @@ Init_class_hierarchy(void)
 {
     rb_cBasicObject = boot_defclass("BasicObject", 0);
     rb_cObject = boot_defclass("Object", rb_cBasicObject);
+    rb_gc_register_mark_object(rb_cObject);
 
     /* resolve class name ASAP for order-independence */
     rb_class_name(rb_cObject);