[bug#60934] [CORE-UPDATES PATCH] gnu: mesa: Use smaller llvm backend.

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

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On Thu, Jan 19, 2023 at 03:14:46AM +0000, John Kehayias wrote:
> Hi Efraim,
> 
> On Wed, Jan 18, 2023 at 04:49 PM, Efraim Flashner wrote:
> 
> > * gnu/packages/gl.scm (mesa)[inputs]: Replace llvm with llvm-for-mesa.
> > * gnu/packages/llvm.scm (llvm-for-mesa): New variable.
> > ---
> >
> > I wasn't able to tweak this to be able to build a cross compiled mesa. I
> > was able to build and run glxgears on core-updates with this patch
> > applied.
> >
> 
> Nice!
> 
> Not sure if you already saw my message on guix-devel
> https://lists.gnu.org/r/guix-devel/2023-01/msg00218.html but I'll just
> repeat the summary: looks like latest mesa wants latest llvm (llvm-15 to
> be exact) for current hardware support. I think this is the summary:
> https://www.phoronix.com/news/LLVM-15-Branched
> 
> Have you tried with other versions of llvm?
> 
> I haven't checked what version of mesa is in core-updates or any pending
> patches, but I can send an update to the latest version if needed.
> 
> I also haven't reviewed/tested this patch, but I do use current mesa via
> another channel where I could try it out with this modification for
> testing and get back to you.
> 
> Thanks for working on this!
> John

I was going to start with llvm-15 but currently core-updates only has up
to llvm-14 and mesa is currently built there with llvm-13, so that's
what I used. I also ran into a number of cross compiling issues while
trying to test cross compiling on core-updates so I think I'll try
working it on master so it can be more easily tested, and then when it's
good I'll commit it to core-updates.  I'll also see about a
master->core-updates merge.

For the next version of the patch I think I'll copy the static libraries
to a static output instead of deleting them. I'm not sure exactly where
they'd be used, but at least in a different output they won't add to the
closure size if we need them and they're available if needed.

-- 
Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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