firefox build broken under clang 3.3

[Dimitry Andric]

On Apr 30, 2013, at 17:25, Dimitry Andric <dim at freebsd.org> wrote:
...
> In any case, I have just built the latest Firefox from ports, with clang 3.3, and I see no issues at all.  At least with approximately 10 minutes of browsing, and visiting a varied bunch of sites.  I do have it built with debug info, but without cranking down the optimization level to -O0 (which is what bsd.port.mk seems to do, unfortunately).
> 
> I will rebuild it again, without any debug info, to see if that makes any difference.  I don't think it will, though...

Rebuilt without debug info, worked just fine.  Is there a particular scenario that makes it crash?