[prev in list] [next in list] [prev in thread] [next in thread] 

List:       gentoo-dev
Subject:    Re: [gentoo-dev] [RFC] New USE_EXPAND: LLVM_TARGETS
From:       Michał Górny <mgorny () gentoo ! org>
Date:       2016-09-29 14:28:26
Message-ID: 20160929162826.548de03c.mgorny () gentoo ! org
[Download RAW message or body]


On Sun, 25 Sep 2016 23:08:52 +0200
Michał Górny <mgorny@gentoo.org> wrote:

> Hi,
> 
> I'd like to introduce a new USE_EXPAND for LLVM & clang. It'd be named
> LLVM_TARGETS, and it's going to replace the current solution based on
> USE=multitarget & VIDEO_CARDS=radeon.
> 
> In the old system, the following rules applied:
> 
> - host (implicitly figured out by LLVM) and BPF targets were always
>   built,
> 
> - VIDEO_CARDS=radeon enabled additional R600 target,
> 
> - USE=multitarget enabled all targets.
> 
> In the new system, LLVM_TARGETS explicitly controls *all* targets
> built. To avoid dependency hell, the host target is package.use.forced
> in specific arch profiles. Additionally, the BPF target is on by
> default.
> 
> The new system will be applied to 3.9.0 and 9999 ebuilds. VIDEO_CARDS
> flag will be removed completely because of no revdeps. USE=multitarget
> will be kept for compatibility until all revdeps are clean.
> 
> As far as revdeps are concerned:
> 
> - Packages that require only host target will not have to be changed at
>   all (since host is still forced-on).
> 
> - Packages that used to require multitarget will eventually have to be
>   changed to request the specific targets they need. They could switch
>   to this when they stop supporting LLVM < 3.9.
> 
> The draft implementation is available in the following PR:
> https://github.com/gentoo/gentoo/pull/2405
> 
> Any comments?

Committed now.

-- 
Best regards,
Michał Górny
<http://dev.gentoo.org/~mgorny/>

[Attachment #3 (application/pgp-signature)]

[prev in list] [next in list] [prev in thread] [next in thread]