Re: GTK build crashes under X

[Jan Djärv]

Stephen Berman skrev:
> On Thu, 07 Dec 2006 11:11:18 +0100 Stephen Berman wrote:
>
> > This was the state of things last night.  This morning I wanted to
> > pursue it but, to my surprise, I now cannot get GTK-Emacs to segfault.
> > I first started it with no ~/.fonts.cache-2 and no
> > /var/cache/fontconfig (and without setting LD_LIBRARY_PATH to
> > /usr/local/lib) and, as last night, it started slow and a ~1.6 MB
> > large ~/.fonts.cache-2 was rebuilt.  But then I could start further
> > instances without deleting ~/.fonts.cache-2, unlike last night.
> > Moreover, when I moved fontconfig back into /var/cache/, I still could
> > start GTK-Emacs (and a big ~/.fonts.cache-2 was again rebuilt).
> > That's the current situation.  So, I'm pleased that I have GTK-Emacs
> > back again, but I would still like to know why I lost it in the first
> > place, so if anyone has an suggestions, I'd be grateful.
>
> Well, now I can get GTK-Emacs to segfault again :-).  I noticed that
> the desktop fonts didn't look as sharp as they normally do (it took me
> a while to notice this, probably because the fonts in Emacs are always
> not so sharp :-), so I ran fc-cache, exited KDE and logged on again.
> Now my desktop fonts are back to their previous sharpness, but
> Emacs-GTK segfaults again with the standard invocation (but I can
> start it by setting LD_LIBRARY_PATH to /usr/local/lib).  So if someone
> is able to advise me how to debug this, I can try to do it.

It is hard if Emacs doesn't fail with the debug-compiled fontconfig.  Does 
wxGTK install fonts?  The cache handling seems to have some bug in it.  As it 
only fails sometimes it might be that the code that builds or reads the cache 
have some uninitialized variable that gets random garbage.  Sometimes that 
garbage is OK, sometimes it isn't.

If you rebuild the cache several times with the same fontconfig, are the 
~/.fonts.cache-2 then identical?  And are they different if you rebuild with 
the fontconfig you compiled?  Does any other Gnome/GTK application fail when 
Emacs fails or is it just Emacs?

        Jan D.