class Bar: has a Q_PROPERTY(bool whatever READ whatever)
class Foo: has a Q_PROPERTY(QWidget* bar READ bar NOTIFY barChanged)

And an instance of "Foo" is set as a property "foo" in the root context.

Then the qml "Text

" will NOT complain about the lack of a NOTIFY signal for Bar::whatever. (Note, I can still successfully access the property 'whatever').

However, if instead, Foo's property is a QObject*, then qml WILL complain (as appropriate).

I think that any class that derives from QObject* should have the appropriate warnings provided.