[oe] [rfc] change default for BUILD_OPTIMIZATION, remove spurious assignments

[Holger Hans Peter Freyther]

On Tuesday 23 June 2009 19:46:54 Phil Blundell wrote:
> On Tue, 2009-06-23 at 10:30 -0700, Khem Raj wrote:
> >  -frename-registers was a workaround to get past a ARM GCC ICE in 4.2
> > IIRC we should get rid of it.
>
> No, -frename-registers is an optimisation in its own right.  I think we
> probably want to keep that.  You might be thinking of the
> -fno-rename-registers that we do use for some packages to avoid an ice
> on arm with gcc 3.4.
>
> > -fexpensive-optimizations and -fomit-frame-pointer are passed by
> > default at O2 so we should get rid of them too.
>
> Is that true on all targets?  I didn't think that -O2 implied
> -fomit-frame-pointer on arm.

From my  testing on recent gcc... it is turned on by default.

z.