Ismail Donmez <ismail <at> pardus.org.tr> writes:
> -O4 will just overwrite the -O2 here unless you hacked configure script not to
> use -O4 by default.
No, -O2 will overwrite -O4:
man gcc
...
If you use multiple -O options, with or without level numbers, the
last such option is the one that is effective.
Carl Eugen