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From: Mike Edenfield <kutulu@kutulu.org>
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Subject: Re: [gentoo-user]  Re: Linux Magazine tests Gentoo performance
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On 10/29/2009 5:13 PM, Nikos Chantziaras wrote:
> On 10/29/2009 10:45 PM, Nikos Chantziaras wrote:
>> I suppose this is interesting to most Gentoo users. Linux Magazine
>> performed a detailed benchmark of Gentoo, comparing it to Ubuntu 9.04:
>>
>> http://www.linux-mag.com/id/7574/1
>
> Btw, I think this is a very nice example of why per-package CFLAGS would
> have been very useful. Some application largely benefit from -Os, others
> from -O2.

If you're willing to put in a bit of effort, I believe you can set up a 
per-package environment (including custom CFLAGS) in a number of ways. 
The one that seems to be most popular is described here:

http://www.mail-archive.com/gentoo-portage-dev@lists.gentoo.org/msg00585.html