Re: [gentoo-user] Portage parenthesis

[Danie Iliev]

On Mon, 2 Oct 2006 08:45:24 +0200
Bo Ørsted Andresen <bo.andresen@××××.dk> wrote:

> On Monday 02 October 2006 08:21, Danie Iliev wrote:
> > Several days ago the guys at gentoo-am64 mailing list explained to me
> > all these flags enable different CFLAGS optimizations which came as the
> [SNIP]
>
> Please don't confuse CFLAGS with USE flags. CFLAGS are passed on to the
> compiler and tell it what kind of code to generate. E.g. an mmx USE flag
> usually tells the package through a configure switch (such as --enable-mmx)
> to autotools to enable some assembly code that uses the mmx instructions
> instead of some fallback code which doesn't. That assembly code is written
> manually rather than generated by the compiler (otherwise the CFLAG would
> suffice).
>
> > There is also another article which explains why these are hard-masked:
> >
> > http://dev.gentoo.org/~plasmaroo/devmanual/archs/amd64/
>
> Thanks, I forgot that one. The url is obsolete though:
>
> http://devmanual.gentoo.org/archs/amd64/index.html
>

Wouldn't CFLAGS and the mentioned USE flags lead to the same thing
(even through different mechanisms) in this particular case?


-- 
Best regards,
Daniel


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