Description

qmltyperegistrar warns about missing Qt base types not found such as QObject:

Automatic QML type registration for target mymodule
Warning: ClassA.h:6: QObject is used as base type but cannot be found.

This issue can be reproduced either by using the qt_add_qml_module() cmake function or running the qmltyperegistrar executable in qt declarative.

Reproduction

Please find attached a minimal code to reproduce it using cmake and one registered class. Run:

./configure
cmake --build build --target mymodule_qmltyperegistration --verbose

Note: the setup is using conan, so make sure to have qt/6.10.0@local/test built

Additional details 

• This warning didn't exist in Qt 6.5.0. 
• After building and running the tool in debug mode, I've found out that the warning comes from https://github.com/qt/qtdeclarative/blob/dev/src/qmltyperegistrar/qmetatypesjsonprocessor.cpp#L544
• The tools warns only once when using qt_add_qml_module(), change the name of class to make it appear again. Running the tool from qt declarative always gives warning.
• Having this issue in a larger, corporate, project gives more warnings such as: 
  QAbstractListModel, QAbstractItemModel, QQuickImageProvider, QSortFilterProxyModel, Qt3DCore::QEntity, QQuickItem