lupdate never stops working

In our project lupdate starts and never comes to an end.

After a little debugging with an fresh build debug version of lupdate i found an interesting stacktrace in processInclude, see screen dump.

The qt internal headers are parsed. But this never comes to an end. Seems that the include files are parsed more then once and they are detected more than once.

For our purpose the WORKAROUND seen in the screen dump did it. 

This is the same for all tested enviroments.

Best regards,

Henner Kollmann