bug#11583: 24.0.97; 24 pretest Emacs.app crashes closing frames

[Eli Zaretskii]

> From: Steven Parkes <smparkes@smparkes.net>
> Date: Tue, 29 May 2012 20:07:28 -0700
> Cc: "11583@debbugs.gnu.org" <11583@debbugs.gnu.org>
> 
> 
> On May 29, 2012, at 7:52 PM, Eli Zaretskii wrote:
> 
> > Can you tell what is error_symbol and data in frame #31 and what
> > symbol is being passed to Fsymbol_value in frame #34?
> 
> Can you give me hints on how to answer this? Something I can do in gdb?

Yes, in GDB.  Like this:

 (gdb) fr 31
 (gdb) p error_symbol
 (gdb) xtype

According to what "xtype" says, use the appropriate x* command to
display the Lisp object.  For example, if "xtype" says it's a symbol,
use "xsymbol", for strings use "xstring", etc.  (You will have to make
sure src/.gdbinit is sourced before you can use the x* commands.)

> I could try building w/o optimizations and see if it still fails. If it does, 
> presumably I can get more info from gdb more easily.

That would be even better.

> Got it. Just looked up how to do this. I overlooked where it was defined on 
> the first go around. Sorry 'bout that.

If you start GDB from the src directory, this works automagically,
because .gdbinit is read and xbacktrace is invoked after each "bt".

Thanks.