When relying on implicit PCH, QML_ELEMENT is not processed by qmltyperegistrar

See attached project. The CppObj class contains both Q_OBJECT and QML_ELEMENT. The relevant headers for those macros are precompiled but not explicitly #include-d.

The Clang code model is happy with the C++ code (when using MSVC) and the project does not produce any compile-time errors. But, it contains runtime errors:

• CppObj::metaObject() is implemented by moc and can be called in C++ (Expected)
• CppObj is not registered as a QML type and is invisible to the QML engine (Not Expected)

Workaround

Explicitly #include-ing the PCH (or <qqmlintegration.h>) fixes the error.