bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3

[Eli Zaretskii]

> From: Florian Ebeling <florian.ebeling@gmail.com>
> Date: Fri, 1 Jun 2012 08:46:40 +0200
> Cc: mituharu@math.s.chiba-u.ac.jp, 11541@debbugs.gnu.org, cyd@gnu.org
> 
> One assumption offered earlier was stack corruption.

That assumption was false.  It was based on the garbled value of
font_spec displayed by GDB due to optimizations.  Now that we see a
valid value in an unoptimized build, we should forget about that
assumption.  Something else is at work here.

One possibility is that trying to pass empty objects to NS APIs causes
the crash.  Since the test program didn't yield empty objects, one
possible approach is to try to understand what is the difference
between the test program and ns_findfonts.