varpool: do not add NULL vnodes to referenced

Avoid adding NULL vnodes to referenced tables.

for  gcc/ChangeLog

	* varpool.cc (symbol_table::remove_unreferenced_decls): Do not
	add NULL vnodes to referenced table.

diff --git a/gcc/varpool.cc b/gcc/varpool.cc
index bfd17f1250cc02280dd53ad8699a34d9b220967b..ccbd6e50f4b012955ed11dddb53cc7bf15143a57 100644 (file)
--- a/gcc/varpool.cc
+++ b/gcc/varpool.cc
@@ -680,10 +680,12 @@ symbol_table::remove_unreferenced_decls (void)
            enqueue_node (vnode, &first);
          else
            {
-             referenced.add (vnode);
+             if (vnode)
+               referenced.add (vnode);
              while (vnode && vnode->alias && vnode->definition)
                {
                  vnode = vnode->get_alias_target ();
+                 gcc_checking_assert (vnode);
                  referenced.add (vnode);
                }
            }