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On Mon, 26 Sep 2016 08:18:27 +0200 |
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Michał Górny <mgorny@g.o> wrote: |
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> On Mon, 26 Sep 2016 00:42:11 +0300 |
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> Mart Raudsepp <leio@g.o> wrote: |
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> |
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> > Ühel kenal päeval, P, 25.09.2016 kell 23:08, kirjutas Michał Górny: |
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> > > I'd like to introduce a new USE_EXPAND for LLVM & clang. It'd be |
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> > > named |
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> > > LLVM_TARGETS, and it's going to replace the current solution based on |
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> > > USE=multitarget & VIDEO_CARDS=radeon. |
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> > > |
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> > > - VIDEO_CARDS=radeon enabled additional R600 target, |
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> > |
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> > No. It enables AMDGPU target these days, which is for the modern stuff |
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> > and very much needed by them. |
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> > r600 stuff was in the llvm 3.3-3.6 era, which was used by old |
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> > experimental mesa[r600-llvm-compiler] as an alternative shader compiler |
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> > for r600 instead of builtin mesa stuff. This work has been ditched long |
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> > ago afaik. |
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> > Instead now VIDEO_CARDS=radeon is required on llvm for radeonsi and |
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> > later AMD GPUs for _ANY_ shader compiler support at all, plus other |
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> > things (from it adding AMDGPU to llvm targets in current ebuild). |
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> |
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> Yes, yes, I am old :-P. You are right, it's AMDGPU these days. |
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> |
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> > > The new system will be applied to 3.9.0 and 9999 ebuilds. VIDEO_CARDS |
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> > > flag will be removed completely because of no revdeps. |
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> > |
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> > People with radeonsi graphics set VIDEO_CARDS=radeon already, I'm a bit |
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> > reserved about having to force them to set some LLVM_TARGETS=radeon or |
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> > LLVM_TARGETS=amdgpu on top of that to satisfy some USE depends on |
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> > mesa[video_cards_radeon]. |
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> |
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> How about nvidia users who seem to require NVPTX for libclc these days? |
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> Do they set VIDEO_CARDS='nvidia nv nouveau ...'? The problem is that |
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> this abuse of VIDEO_CARDS is never going to be 100% clear to users. |
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> |
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> I guess we can enable GPU targets in desktop profiles by default to |
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> save most of our users from the issues. |
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Hmm, I actually see we're enabling them in arch profiles. So I guess |
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matching enable there would fit there as well. |
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-- |
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Best regards, |
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Michał Górny |
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<http://dev.gentoo.org/~mgorny/> |
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