On 02/19/2018 11:38 AM, Michał Górny wrote: > W dniu pon, 19.02.2018 o godzinie 21∶32 +0200, użytkownik Mart Raudsepp > napisał: >> On Mon, 2018-02-19 at 18:34 +0100, Ulrich Mueller wrote: >>>>>>>> On Mon, 19 Feb 2018, Michael Lienhardt wrote: >>>>> >>>>> 2. ||= (binding any-of) dep groups. >>>> >>>> I don't understand what this group means, and the PMS-7 is unclear >>>> as well: >>>> "binding-any-of A binding-any-of group, which has the same format >>>> as the any-of group, but begins with the string ||= instead." >>>> Is it a "or", like the "any-of" group, but with a different >>>> behavior >>>> at compiling/linking time? >>> >>> It is explained in section 8.2.4: >>> https://dev.gentoo.org/~ulm/pms/7-draft/pms.html#x1-800008.2.4 >> >> Maybe I missed this, but a real world use case example would be nice, >> maybe someone feels a harder itch to scratch then :) >> > > The original use case was for providers-like thingies, e.g.: > > ||= ( ffmpeg:0= libav:0= ) > > That said, I'd personally prefer doing that with proper USE_EXPAND > and REQUIRED_USE enforcing but this has been rejected.
Indeed, the tendency of || deps to make things less deterministic can be troublesome. Maybe automatic REQUIRED_USE satisfaction will make the REQUIRED_USE approach more acceptable to those who have rejected it. -- Thanks, Zac
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