QtMultimediaQuick links against QtMultimediaPrivate. Since QtMultimediaPrivate is an interface library, we did not add its master header to the precompiled headers of QtMultimediaQuick. However, it's likely that if one uses a private module then headers of the public module are used. Now, we don't discard all interface libraries in qt_update_precompiled_header_with_library but - detect if it's a private Qt module - retrieve the public Qt module target - call qt_update_precompiled_header_with_library with that Fixes: QTBUG-142078 Change-Id: Ic0eff21b8265cd622202efdd4ffd878e1f1fdea1 Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>