Heads up: Mesa/LLVM rebase and OpenGTL retirement in F20

[Jens Petersen]

Hi,

> We'd like to update to Mesa 10.1 in Fedora 20, since the cycle is so
> long before F21 and (among other goodies) it enables OpenGL 3.3 on some
> newer Radeons.  This implies rebasing LLVM 3.4, and that's where it gets
> a little awkward: the OpenGTL package only works up to LLVM 3.3.

One concern from me is that ghc on ARM uses llvm as its compiler backend.
To be honest things are already bad enough for ghc with llvm-3.3 there
that I am not sure if they could get much worse with 3.4... ;)
though really need to test (3.2 was better).  I haven't seen
any Haskell build regressions yet though with llvm-3.4 in Rawhide
relative to 3.3 at least.

(ghc-7.6.3 officially supports only llvm <= 3.1, but ghc-7.8, which will be
released soon and I am planning to ship it in F21, will support 3.4.
Maybe I should add "Requires: llvm <= 3.4" at that time to ghc.spec for ARM.;)

Jens