RE: GHC 7.6 failes to build

| The HEAD version of DPH might work with ghc-7.6 right now, but we don't
| expect it to in the future.

Indeed. That's entirely reasonable. I started off building the ghc-7.6 branch by saying
	sync-all checkout ghc-7.6
to get compatible compilers and libraries.  But for
	dph
	vector
	random
there *is* no ghc-7.6 branch, so I had to use master.

So the question (for Ben, Manuel) is this: which branch of DPH should one use with ghc-7.6?  Maybe the answer is "none", in which case we can be careful
  a) to ignore DPH when testing the ghc-7.6 branch
  b) to tell users that they should not attempt to use DPH with ghc 7.6

Is that the idea? Or is there a version that should work? 

For vector and random the same questions apply, but since we simply have lagging git repos for them we can create a ghc-7.6 branch.  Did you deliberately not do that, Ian?

Simon


| -----Original Message-----
| From: Ben Lippmeier [mailto:[email protected]]
| Sent: 06 December 2012 02:06
| To: Ian Lynagh
| Cc: [email protected] list; Simon Peyton-Jones; Manuel M T Chakravarty
| Subject: Re: GHC 7.6 failes to build
| 
| 
| On 06/12/2012, at 5:19 AM, Ian Lynagh wrote:
| 
| > On Wed, Dec 05, 2012 at 05:49:03PM +0000, Simon Peyton-Jones wrote:
| >>
| >> validate from scratch on Linux on the 7.6 branch fails thus in dph.
| >> My validate.mk is htis
| >>
| >> I will move dph out of the way for now, but what's wrong?
| >
| > Hmm, we don't build DPH in the 7.6 branch by default, and I recently
| > bumped HEAD's base version and updated DPH to match. For some reason
| > all the DPH deps are of the form x.y.*, which means 7.6's base doesn't
| > satisfy the dependency.
| >
| > Ben, Manuel, is there a reason the dependencies are in that form? Is
| > the HEAD DPH supposed to work with the GHC 7.6 branch?
| 
| No. The DPH libraries for a particular GHC branch are only expected to
| work with that branch. The DPH libraries are tied to a particular
| version of GHC, because they depend so much on properties of the
| vectoriser.
| 
| I've been using a dependency on the base package as a proxy for the GHC
| version number. If you bump the base package version then you'll need to
| make a ghc-7.6 branch for DPH, like you've been doing for the other
| libraries.
| 
| The HEAD version of DPH might work with ghc-7.6 right now, but we don't
| expect it to in the future.
| 
| Is that ok?
| 
| Ben.