Qt dev branch: "invalid covariant return type" for QEvent

[Florian Bruhin]

Hi,

When trying to build the current dev branch of Qt 6 against the
currently released PyQt:

    PyQt-builder 1.12.2
    PyQt6-sip 13.3.1
    PyQt6 6.3.0

I get:

    /tmp/tmplprdnj33/QtGui/sipQtGuiQCloseEvent.cpp:47:16: error: invalid covariant return type for ‘virtual QEvent* sipQCloseEvent::clone() const’
       47 |      ::QEvent* clone() const SIP_OVERRIDE;
          |                ^~~~~
    In file included from ../../../home/florian/proj/qt/dev6/build/qtbase/include/QtCore/qcoreevent.h:1,
                     from ../../../home/florian/proj/qt/dev6/build/qtbase/include/QtGui/../../../../qt5/qtbase/src/gui/kernel/qevent.h:9,
                     from ../../../home/florian/proj/qt/dev6/build/qtbase/include/QtGui/qevent.h:1,
                     from /home/florian/proj/qt/dev6/pyqt/PyQt6-6.3.0/sip/QtGui/qevent.sip:290:
    ../../../home/florian/proj/qt/dev6/build/qtbase/include/QtCore/../../../../qt5/qtbase/src/corelib/kernel/qcoreevent.h:27:16: note: overridden function is ‘virtual QCloseEvent* QCloseEvent::clone() const’
       27 |         Class* clone() const override; \
          |                ^~~~~
    ../../../home/florian/proj/qt/dev6/build/qtbase/include/QtGui/../../../../qt5/qtbase/src/gui/kernel/qevent.h:554:5: note: in expansion of macro ‘Q_DECL_EVENT_COMMON’
      554 |     Q_DECL_EVENT_COMMON(QCloseEvent)
          |     ^~~~~~~~~~~~~~~~~~~
    make[1]: *** [Makefile:43949: sipQtGuiQCloseEvent.o] Error 1

With similar errors for other clone() implementations too:
https://paste.the-compiler.org/view/6c24584a

Is that an issue in sip/PyQt? A backwards-incompatible change in Qt?
Something else entirely?

Florian

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