Cypclass Cyobject base added after type analysis

Cython/Compiler/Nodes.py

@@ -1485,15 +1485,6 @@ class CppClassNode(CStructOrUnionDefNode, BlockNode):
             base_classes=[], visibility=self.visibility, templates=template_types, cypclass=self.cypclass)
 
     def analyse_declarations(self, env):
-        if self.cypclass:
-            cyobject_class = CSimpleBaseTypeNode(self.pos,
-                name = "cyobject", module_path = [],
-                is_basic_c_type = 0, signed = 0,
-                complex = 0, longness = 0,
-                is_self_arg = 0, templates = None
-            )
-            self.base_classes.append(cyobject_class)
-
         if self.templates is None:
             template_types = template_names = None
         else:
@@ -1508,7 +1499,21 @@ class CppClassNode(CStructOrUnionDefNode, BlockNode):
                 return True
             else:
                 error(self.pos, "Base class '%s' not a struct or class." % base_class)
-        base_class_types = filter(base_ok, [b.analyse(scope or env) for b in self.base_classes])
+        base_types_list = [b.analyse(scope or env) for b in self.base_classes]
+        if self.cypclass:
+            cyobject_base = False
+            for base_type in base_types_list:
+                cyobject_base = cyobject_base or base_type is cy_object_type or base_type.is_cyp_class
+            if not cyobject_base:
+                cyobject_class = CSimpleBaseTypeNode(self.pos,
+                    name = "cyobject", module_path = [],
+                    is_basic_c_type = 0, signed = 0,
+                    complex = 0, longness = 0,
+                    is_self_arg = 0, templates = None
+                )
+                self.base_classes.append(cyobject_class)
+                base_types_list.append(cyobject_class.analyse(scope or env))
+        base_class_types = filter(base_ok, base_types_list)
         self.entry = env.declare_cpp_class(
             self.name, scope, self.pos,
             self.cname, base_class_types, visibility=self.visibility, templates=template_types, cypclass=self.cypclass)