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