optimization levels for 6-STABLE build{kernel,world}

[Gary Kline]

On Thu, Sep 14, 2006 at 10:07:35AM +1000, Tony Maher wrote:
> Gary Kline wrote:
> 
> > <deleted>
> >
> > 	A couple of things.  Will having gcc unroll loops have any
> > 	negative consequences?  (I can't imagine how:: but better 
> > 	informed than to have something crash inexplicability.)
> > 	With 6.X safe at -O2 and with -funroll-loops, that should be
> > 	a slight gain, right?  (It also will make an upgrade from 5.5 
> > 	to 6.[12] that much more rational.)
> 
> -funroll-loops affect loader see
> http://lists.freebsd.org/pipermail/freebsd-stable/2006-September/028145.html
> 

	Right.  This is probably what Chuck Swiger was talking about.
	I've never had this problems on my 5.[345] releases.  And not
	with 6.1 (knock-wood!!). 

	I've just upgraded to -RELEASE and going to rebuild overnight on
	the server that traped out.  With -funroll-loops gone :-)

	gary

> --
> tonym

-- 
   Gary Kline     kline at thought.org   www.thought.org     Public service Unix