Re: [jazzplusplus-devel] Core dumpage

[Matt K. <ra...@ch...>]

OK, I've found the problem.  It's a wxGTK bug, in the wxString
class.

The default constructor initializes a pointer data member (the member that
holds the actual storage) to NULL.  The destructor blindly 
dereferences this pointer.  If the string never gets set to anything,
it dereferences a NULL pointer minus an index, making for a truly
horrible pointer value.

Unfortunately, the wxGTK library has a few global wxString variables
which normally don't get used.  Thus, they contain these NULL pointers
and seg fault on exit when their destructors get called globally.

There is a very simple fix, but sadly, the bug is within wxGTK.
If anyone is interested, I'll post the fix.  I'll also contact
the wxWindows team and notify them.

Matt

> 
> As Patrick wrote, It's been there as long as I can remember.
> 
> It has always annoyed me so it would be great if you could eliminate it.
> 
> Cheers,
> /Joakim
> 
> Matt Kelly wrote:
> 
> > All,
> >
> > I've been looking into why JAZZ dumps core when you exit.
> > I think I may be onto something.  It appears to be dumping
> > core during the destruction of a global wxString located
> > within the wxGTK library itself.  Not sure if it's a wxGTK
> > bug, a wxWindows bug, or if it's something we're causing,
> > but it smells like it might be a wxGTK bug.
> >
> > My question to the group: how many of you see this behavior?
> > I'm asking because I see the same behavior with Audacity.
> > My copy of Audacity came bundled with my SuSE installation.
> > This seems to reinforce my beliefs.
> >
> > Also, interestingly, I grabbed the latest wxGTK source, and
> > compiled it in debug mode, and installed it.  I made Jazz
> > use it for its compiling.  Guess what, same thing on exit!!!
> >
> > I just want to see if other distros see this same behavior.
> >
> > Thanks,
> >
> > Matt