[bug#49569] [PATCH] gnu: Add make-single-arch-llvm procedure.

[Efraim Flashner <efraim@flashner.co.il>]

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On Mon, Jul 26, 2021 at 06:47:14PM +0200, Ludovic Courtès wrote:
> Hi,
> 
> Efraim Flashner <efraim@flashner.co.il> skribis:
> 
> > * gnu/packages/llvm.scm (make-single-arch-llvm): New procedure.
> > (llvm-native-12, llvm-native): New variables.
> > ---
> >
> > Using this copy of llvm for packages like mesa will reduce the closure
> > of those packages. I don't suppose it would work as well for compilers
> > like rust which use LLVM for compiling and targeting different
> > architectures.
> >
> > This drops the size of llvm-12 from 167M to 111M.
> 
> That’s less impressive than I would have thought.
> 
> For Mesa perhaps we could maybe have a variant that’s even more
> stripped?
> 
> The downside of this is that we risk having several LLVM copies on
> typical installations.
> 
> Thoughts?
> 
> Thanks,
> Ludo’.

I think you're mostly shocked by the large numbers, it is a drop of 33%.

It turns out that llvm-julia uses something similar to only target one
arch, so the idea's there somewhere. We could probably add it in there
too for dlang. Icecat/icedove/mozjs-78 should be OK to switch. And
xf86-video-vmware already has mesa as an input and could likely use a
special llvm-for-mesa version.

I can look at mesa and see which libraries from llvm it links to and see
about just building those. A first look shows 50 llvm libraries from
mesa and about 150 from llvm@11, with the 4 libraries being
libOSMesa  libvulkan_radeon  libxatracker  libXvMCnouveau


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