bug#25879: [PATCH] gnu: Add LLVM and CLANG 3.9.1.

[Ricardo Wurmus <rekado@elephly.net>]

Roel Janssen <roel@gnu.org> writes:

> Ricardo Wurmus writes:
>
>> Pjotr Prins <pjotr.public12@thebird.nl> writes:
>>
>>> On Tue, Mar 07, 2017 at 09:06:28PM +0100, Ludovic Courtès wrote:
>>>> > Well, actually, this is just the latest release, so maybe I should
>>>> > update the 3.8.1 recipe to3.9.1 instead.  WDYT?
>>>>
>>>> If the other users of LLVM and Clang (as per ‘guix refresh -l llvm’) can
>>>> cope with it, upgrading sounds better indeed.  Could you check if that
>>>> is the case?
>>>
>>> With LLVM it is probably a good idea to keep the major versions as
>>> packages tend to lag after latest. Many compiler writers are a bit
>>> behind and sometimes people want to use older compilers (like with
>>> Julia).
>>
>> I agree.
>>
>> @Roel: I see that this patch hasn’t been pushed yet.  Is there anything
>> missing or was it just forgotten?
>
> I think the idea was to upgrade, instead of have this newer version next
> to the current version.  The upgrade involves a lot of rebuilding, and I
> am stuck at compiling 'dub' with 3.9.1.
>
> If we can instead apply this patch as (having both 3.8.1 and 3.9.1), we
> can push it, and after that add the darktable patch as well.

I think it’s fine to have multiple versions of LLVM + Clang around,
especially considering that in my experience many dependent projects
won’t build with later versions without adjustments.  (RStudio, for
example, still insists on the oldest version of Clang that we offer, and
it crashes with later versions.)

It would be good to keep an eye on this, though, to make sure that we
don’t provide outdated versions that have no users and no maintainer.

--
Ricardo

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