@SGaist It's a bit inconvenient because it causes a new terminal window to open every time. I'd prefer to have just one window that all of my app's output goes to so I can place it in a specific spot.
I see that, behind the scenes, Qt Creator is calling a bash script that executes some AppleScript to get the terminal window to open. I may try tinkering with it to see if I can get it to behave how I want, but it'd be much more convenient if Qt Creator allowed breaking off the Application Output (and the issues section now that I think about it) into its own floating window so that I can make full use of the vertical real estate of my screen.
Just just launch your app from the console. qDebug, qWarning etc. will be printed to the console too (stdout/stderr). Make sure you don't define QT_NO_DEBUG_OUTPUT -- see http://doc.qt.io/qt-5/debug.html for more info.
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