[Mesa-maintainers] [Mesa-dev] Building Mesa GIT with LLVM prior to 3.9

[Vedran Miletić]

On 09/18/2017 06:00 PM, Emil Velikov wrote:
> Hi all,
> 
> As you may know, different components in Mesa use LLVM for various purposes.
> 
> In particular:
>  - 3.3.0 for the aux gallium module, gallivm
>  - 3.6.0 for the opencl state-tracker, clover
>  - 3.9.0 for multiple drivers r600, radeonsi, radv and swr
> 
> AFAICT gallivm is build on Windows, and using newer LLVM in there is
> rather hard/messy.
> 
> On the other hand, Clover is built on Linux/BSD platforms. Which seems
> to be OK wrt availability and the respective packaging.
> So leaving the former out for now, I'm wondering if we cannot bump the
> Clover requirement to 3.9.0.
> 
> Quick search shows:
>  - Debian - 3.9 since stretch (stable)
>  - Ubuntu - 3.9 since trusty (14.04LTS)
>  - FreeBSD - 3.9
>  - openSUSE - 3.9 since Leap 42.2 (unofficial), official since Tumbleweed
>  - Fedora - 3.9 since F25
>  - Gentoo - 3.9 is marked as stable
>  - Archlinux - using 5.0
> 
> Note: older enterprise distributions seems to be in the cold.
> Yet there's little point in them building Clover since it cannot be
> run on those.
> 
> Thanks
> Emil
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> 

I'm normally on the "let's keep it compatible as long as realistically
possible" side, but given that all drivers that Clover works with
already require LLVM 3.9, I'd say yes, bump the requirement (this allows
us to get rid of three quarter of #if HAVE_LLVM version checks).

Regards,
Vedran

-- 
Vedran Miletić
vedran.miletic.net