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List:       gentoo-dev
Subject:    Re: [gentoo-dev] RFCv2: USE=avcodec (+ USE=ffmpeg/libav)
From:       Zac Medico <zmedico () gentoo ! org>
Date:       2015-01-20 20:23:30
Message-ID: 54BEB942.4070300 () gentoo ! org
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On 01/20/2015 12:15 PM, Ciaran McCreesh wrote:
> On Tue, 20 Jan 2015 12:12:32 -0800
> Zac Medico <zmedico@gentoo.org> wrote:
>>>> Regardless of whether or not (or how) we choose to apply
>>>> REQUIRED_USE to various cases, I think we should keep REQUIRED_USE
>>>> around, since having a machine-readable representation of these
>>>> constraints can potentially be extremely useful to dependency
>>>> resolvers.
>>>
>>> [evidence needed]
>>
>> REQUIRED_USE is already successfully used to apply constraints that
>> would otherwise need to be enforced by executing shell code in
>> pkg_pretend. I think it's obvious that the declarative and
>> machine-readable nature of REQUIRED_USE make if preferable to using
>> pkg_pretend in many cases.
> 
> It's not obvious at all. The evidence so far suggests that good human
> readable messages are important, and that if we're ever going to get
> automated resolution then we'll need a new not-SAT-based format anyway.

Nothing stops us from using pkg_pretend right now. Since REQUIRED_USE
remains useful, I would suggest that we keep it around until we have
implemented a replacement that allows for automated resolution.
-- 
Thanks,
Zac

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