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

[Pjotr Prins]

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).

Pj.
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