Console window?

I knew once, but I have forgotten (sorry, senior moment here) and I can't find it again.
What is it that controls whether the Windows o/s console window shows for debugging?

I'm building a release, and it is still showing up.

My pro file has
CONFIG += release \
help

If your subsystem is Console, then console window shows up.

For showing console window it was -

CONFIG += console

may be you can try
CONFIG -= console for release :rolleyes:

Thanks for your suggestions, but nothing is working so far. I've tried changing likely looking settings in Projects, but no luck.

you are sure it is not a QtCoreApplication, right ?

Right, I'm sure. QtGui, no QtCore

Working now - it was the testlib. Thanks for all of your suggestions.