[PATCH] Add -funknown-commons to work around PR/69368 (and others) in SPEC2006

[Jakub Jelinek]

On Fri, Mar 04, 2016 at 02:27:46PM +0100, Richard Biener wrote:
> > +funknown-commons
> > +Common Var(flag_unknown_commons)
> > +Assume common declarations may be overridden with unknown larger sizes
> 
> I think to make it work with LTO you need to mark it 'Optimization'.
> Also it's about
> arrays so maybe
> 
> 'Assume common declarations may be overridden with ones with a larger
> trailing array'
> 
> also if we document it here we should eventually document it in invoke.texi.

Also, isn't the *.opt description line supposed to end with a full stop?

	Jakub