[Interest] [Qt6] QML_ATTACHED failing with ::QQmlPrivate not declared

[Konstantin Shegunov]

Hello,
I've been doing some experimenting with Qt6's QML - C++ integration
(qtdeclarative @ 3d23912b0e, following the docs on providing attached
properties for a QML exposed class and I'd got the aforementioned compile
error.

I have the C++ class(es) in a dynamic library where in the CMakeLists.txt
I've added the absolute minimum:

qt_add_qml_module(TscCore

    URI TscCore

    VERSION ${TSC_VERSION}

)

The code which causes the error is very bare-bones; it basically
follows the documentation's examples. The classes are in a namespace,
but I don't believe that's the actual cause for the error.
Here's a very condensed snippet of the declarations:


#include <QtQml/qqmlregistration.h>


TSC_BEGIN_NAMESPACE


class TSCCORE_API SimulationAttachedType : public QObject

{

    Q_OBJECT

    QML_ANONYMOUS

public:

... };

class TSCCORE_API Simulation : public QObject

{

    Q_OBJECT

    Q_DISABLE_COPY(Simulation)


    QML_ATTACHED(SimulationAttachedType)

    QML_UNCREATABLE("")

    QML_NAMED_ELEMENT(Simulation)

... };

TSC_END_NAMESPACE

With a bit of sifting through the headers the error goes away if I include
QtQml/qqmlprivate.h. After that the integration part works just fine, the
objects are available and the attached properties accessible.

So, did I stumble on a bug?

Kind regards,
Konstantin.
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