Re: GTK error messages

On Mon, 28 Dec 2020, Michael Eager wrote:

> I'm running a wxPython program using a wx.ScrolledWindow.  I'm getting a lot 
> of the following console messages:
>
> (main.py:1170792): Gtk-CRITICAL **: 08:59:46.366: gtk_box_gadget_distribute: 
> assertion 'size >= 0' failed in GtkScrollbar
>
> I'm guessing that there is something in the way that the ScrolledWindow 
> widget is initialized that is incorrect or incomplete.
>
> Can anyone suggest how to debug this?
>
> What's the best way to track back from a GTK error to the wxWidgets code 
> triggering the error?
>
> wxWidgets Library Version 3.1.5,  Compiled Dec 17, 2020 (using pip3).
> Runtime version 3.22.  Compile-time GTK 3.22.30.

Unfortunately, GTK is rather noisy with its warnings and this doesn't 
*necessarily* indicate that there's a bug somewhere (although there could 
be).  Do you see any problems in your application?

You can make a GTK program abort on the first warning using a special 
command line option, --g-fatal-warnings.  With this you can get a stack 
trace with gdb when the warning occurs.  Doing it with Python is a little 
tricky, but here's how you can do it:

$ gdb python3

...

(gdb) run <your program>.py --g-fatal-warnings

Then you should be able to get a stack trace, debug, etc. when one of 
those warnings occurs.

Scott

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