Clang: "no_keywords" in .pro file leads to "could not parse included file" in Qt headers

The situation is a QMake project where CONFIG += no_keywords is set (see attached no_keywords_bug.zip for a minimal example project). The main.cpp file includes QObject, which makes the Clang codemodel in Qt Creator 4.2-rc1 complain (see attached error1.png):

The code model could not parse an included file, which might lead to slow or incorrect codecompletion … qobject.h:424:7

The resp. line in Qt 5.6 qobject.h reads:

public Q_SLOTS:

The code model marks this line as an error and the tooltip says (see error2.png):

error. unknown type name 'slots' … expanded from macro 'Q_SLOTS'

In Creator 4.1 a Ctrl+Click on Q_SLOTS in that line jumps to the empty Q_SLOTS definition in qobjectdefs.h:71 as expected. In Creator 4.2 the same Ctrl+Click is disabled.

When I remove the "no_keywords" from the project config the problem disappears.

Qt Creator 4.1 shows the same error in qobject.h, but nothing in main.pp (since I guess those error popups are new; they’re a great feature btw).

Compilation (tried with GCC and Clang) succeeds without any warnings or errors.