17.11.2010 14:51, Andrew пишет:
> IMHO - this means that -march option also sets by default -mtune for
> arch if it isn't specified in command line. At least, performance tests
> show this behavior.
> I tested different -mrach and -mtune (look at dry2 package - dhrystone
> benchmark) and it shows different performance. Strange, but -march=i686
> for me shows slightly worse results that -march=i486 -mtune=i686.
>
After brief look - I found that slackware used same behavior: 
http://slackbuilds.org/howto/versions/

if [ "$ARCH" = "i486" ]; then
   SLKCFLAGS="-O2 -march=i486 -mtune=i686"
elif [ "$ARCH" = "i686" ]; then
   SLKCFLAGS="-O2 -march=i686 -mtune=i686"
fi

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