decl.c (duplicate_decls): When combining typedefs, remove the new type from the variants list.

	* decl.c (duplicate_decls): When combining typedefs, remove the
	new type from the variants list.

From-SVN: r230202

gcc/cp/ChangeLog

 2015-11-11  Jason Merrill  <jason@redhat.com>
 
+	* decl.c (duplicate_decls): When combining typedefs, remove the
+	new type from the variants list.
+
+2015-11-11  Jason Merrill  <jason@redhat.com>
+
 	* pt.c (instantiate_class_template_1): Set function_depth around
 	instantiation of lambda op().
 

gcc/cp/decl.c

@@ -2014,7 +2014,22 @@ duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
       /* For typedefs use the old type, as the new type's DECL_NAME points
 	 at newdecl, which will be ggc_freed.  */
       if (TREE_CODE (newdecl) == TYPE_DECL)
-	newtype = oldtype;
+	{
+	  newtype = oldtype;
+
+	  /* And remove the new type from the variants list.  */
+	  if (TYPE_NAME (TREE_TYPE (newdecl)) == newdecl)
+	    {
+	      tree remove = TREE_TYPE (newdecl);
+	      for (tree t = TYPE_MAIN_VARIANT (remove); ;
+		   t = TYPE_NEXT_VARIANT (t))
+		if (TYPE_NEXT_VARIANT (t) == remove)
+		  {
+		    TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (remove);
+		    break;
+		  }
+	    }
+	}
       else
 	/* Merge the data types specified in the two decls.  */
 	newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));