On Sun, 25 Sep 2016 23:08:52 +0200 Michał Górny <mgo...@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/>
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