Fix code generation when overloaded cpp methods have different c names

Cython/Compiler/ExprNodes.py

@@ -7578,6 +7578,9 @@ class AttributeNode(ExprNode):
             if obj.type.is_builtin_type and self.entry and self.entry.is_variable:
                 # accessing a field of a builtin type, need to cast better than result_as() does
                 obj_code = obj.type.cast_code(obj.result(), to_object_struct = True)
+            if obj.type.is_cpp_class and self.entry and self.entry.is_cfunction:
+                # the entry might have been resolved to an overladed alternative in the meantime
+                self.member = self.entry.cname
             if obj.type.is_cyp_class and self.entry and self.entry.from_type:
                 self.member = "%s::%s" % (self.entry.from_type.empty_declaration_code(), self.member)
             return "%s%s%s" % (obj_code, self.op, self.member)