qDebug repeating output

[Spacehopper]

Hi,
I seem to have managed to do something strange to my Qt5 library on macOS Sequoia 15.4. I resurrected some old C++ code from several years ago and in the process seem to have made every call to qDebug repeat the output.

For instance: qDebug("Grid solved.")
results in this output:
Grid solved.
Grid solved.

Is it possible to reinstall the relevant library?

TIA.

Chris

[piervalli]

There more load instance.

[SGaist]

@Spacehopper hi,

Do you see that in Qt Creator ? On the command line ?
Do you have a custom message handler ?

[Spacehopper]

@SGaist

Thanks for responding.

I use Xcode as my IDE and I don't have a custom message handler. I don't have access to or use Qt Creator.

[Spacehopper]

I run the code from Xcode using Product -> Run

The output from qDebug appears in the console pane of Xcode

[Spacehopper]

This is code I started back in 2008 to solve Sudoku puzzles. It ran fine up until 2021 when I lost interest. However my wife has now become a Sudoku fanatic and asked me how to solve a slightly difficult puzzle. I resurrected the code to demonstrate using certain strategies and noticed that all qDebug output to the Xcode console pane was repeated. I put a breakpoint on a common code line using qDebug and when I single stepped through the code line it caused the output to be repeated so I assumed something odd had happened to the relevant library.

[Spacehopper]

Ah! Interesting. If I run the app from a terminal the repeated output is absent. Any clue there?

[JonB]

@Spacehopper
I do not know how it works under Mac/Xcode, but I would say: qDebug() output appears on "stdout"/"stderr" or similar. That is one output you see from a plain terminal. Whatever "IDE" Xcode is, it sounds like inside it it (Xcode) also echoes any such messages --- debug output or stderr or whatever --- to output, hence you see it twice? I do not know whether there is maybe an Xcode setting for that.

[Spacehopper]

OK, so thinking this through, it looks like the problem lies with some setting in Xcode. I apologise for posting to the wrong forum and thank you for your forbearance.

[Spacehopper]

@JonB

Xcode is the macOS IDE offering for development for ANY Apple OS. I have been using it, on and off, since 2006 without too much in the way of problems but Xcode has changed a lot since I last used it in 2021 hence my rustiness. :-)