OpenWRT normally sets it in the Build Options section of the menuconfig.

On Tue, Mar 31, 2015 at 10:20 AM, Dave Taht <dave.taht@gmail.com> wrote:

> How do I try a different set of compile options nowadays?
>
> I change it in CC .config, it changes back.
>
> Used -O2 in cero...
>
> python, for example, is way slower than it was.
>
> Evan:  old box: 0.210u 0.020s 0:00.23 100.0%        0+0k 0+0io 0pf+0w
> new box: 3.280u 0.080s 0:03.36 100.0%        0+0k 0+0io 0pf+0w
> there's slow and then there's slow
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