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

[Emil Velikov]

On 19 September 2017 at 15:23, Vedran Miletić <vedran at miletic.net> wrote:
> 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).
>
Dropping a handful of HAVE_LLVM hunk is an added bonus. A very nice
one though ;-)

Considering the input so far, I'll send a patch to bump the
requirement early next week.
Just giving another few days for people to shout ;-)

-Emil