[PATCH] Compile options: default to -O2 when -Os is not available

Wolfgang Denk wd at denx.de
Sun May 1 14:58:47 UTC 2011


Dear Rich Felker,

In message <20110501140118.GF277 at brightrain.aerifal.cx> you wrote:
> On Sun, May 01, 2011 at 02:00:27PM +0200, Wolfgang Denk wrote:
> > chains).  This commit changes behaviour so "-O2" gets used as fallback
> > when "-Os" is not available.  This reduces the image size in above
> > test to 1.3 MiB.  This is still 10...15% more then what we get with
> > "-Os", but much better than using no optimization at all.
> 
> Why not -O1?

The -O1 image is ~ 1.5% bigger than the -O2 one
(1278063 versus 1258658 byes for defconfig for PowerPC).

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
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