bug#16126: 24.3.50; segfault on Cygwin

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 13 Dec 2013 16:44:40 +0900
> From: Katsumi Yamaoka <yamaoka@jpl.org>
> Cc: 16126@debbugs.gnu.org
> 
> Dmitry Antipov wrote:
> > On 12/13/2013 06:07 AM, Katsumi Yamaoka wrote:
> >> Program received signal SIGSEGV, Segmentation fault.
> >> 0x0053c90d in font_close_object (font_object=font_object@entry=538803829)
> >>      at font.c:2902
> >> 2902	  FRAME_DISPLAY_INFO (font->frame)->n_fonts--;
> 
> > Do you have --enable-checking enabled?
> 
> Ok, I used --enable-checking=yes and CFLAGS=-O0, and rebuilt
> Emacs.
> 
> > If font->frame is not NULL, could you also please do:
> > (gdb) p *font->frame
> > and
> > (gdb) p *font->frame->output_data.x->display_info
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x005ce4d5 in font_close_object ()
> (gdb) p font->frame
> No symbol "font" in current context.
> (gdb) p *font->frame
> No symbol "font" in current context.
> (gdb) p *font->frame->output_data.x->display_info
> No symbol "font" in current context.
> 
> Hm, there is no meaningful info, isn't it?
> Before this I rebuilt Emacs without specifying CFLAGS, and got
> ``value has been optimized out'' for all those.

There was a discussion yesterday on the Cygwin list about a similar
problem (I think), and the solution was to do some cleanup with your
font configuration.  Perhaps your problem is similar?