[ANNOUNCE] GHC 8.4.1-alpha1 available
oleg.grenrus at iki.fi
Thu Dec 21 20:48:45 UTC 2017
I copy & paste Hervert's reddit answer here , for ones who don't
As the suffix "alpha" implies, this is a very bleeding edge release with
very little guarantees regarding API stability (c.f. new GHC schedule
Put differently, a package that works now with GHC 8.4.1-alpha1 may not
necessarily work with the final GHC 8.4.1 release.
In order to support early adopters in testing GHC 8.4.1-alpha, there's a
new Overlay Hackage Package Index <https://github.com/hvr/head.hackage>
 which provides packages patched for unreleased GHCs (currently GHC
8.4.1-alpha1 & GHC 8.5/HEAD). See its README
<https://github.com/hvr/head.hackage#README>  for instructions on how
to use it; there's also a shell script included which automates common
workflows; finally there's also support for HEAD.hackage in
themake-travis-yml Travis CI script generator
<https://github.com/haskell-hvr/multi-ghc-travis>.  Don't hesitate to
ask if you have questions!
As usual, there's already an (incomplete & work-in-progress) GHC 8.4.x
Migration Guide <https://ghc.haskell.org/trac/ghc/wiki/Migration/8.4>
 you can consult and maybe even help complete.
- : https://github.com/hvr/head.hackage
- : https://github.com/hvr/head.hackage#README
- : https://github.com/haskell-hvr/multi-ghc-travis
- : https://ghc.haskell.org/trac/ghc/wiki/Migration/8.4
On 21.12.2017 22:16, George Colpitts wrote:
> Thanks Ben. I installed the Mac binaries.
> For others who are wondering, you need llvm 5 if you want to use llvm
> with this.
> Needless to say, many libraries, e.g. haskell-src-exts, primitive, and
> intero won't compile with this even with --allow-newer
> I'll notify those libraries about that in case they want to get
> started on 8.4.1
> On Wed, Dec 20, 2017 at 4:48 PM Ben Gamari <ben at well-typed.com
> <mailto:ben at well-typed.com>> wrote:
> The GHC development team is pleased to announce the first alpha
> of the 8.4.1 release. The usual release artifacts are available from
> Note that this release drops compatibility with GCC 4.6 and earlier.
> While we generally try to place as few constraints on system toolchain
> as possible, this release depends upon the __atomic__ builtins
> by GCC 4.7 and later (see #14244).
> === Notes on release scheduling ===
> The 8.4.1 release marks the first release where GHC will be
> adhering to
> its new, higher-cadence release schedule . Under this new scheme,
> major releases will be made in 6-month intervals with interstitial
> releases as necessary.
> In order to minimize the likelihood of schedule slippage and to ensure
> adequate testing, each major release will be preceeded by a number of
> regular alpha releases. We will begin issuing these releases roughly
> three months before the final date of the major release and will issue
> roughly one every two weeks during this period. This high release
> cadence will allow us to quickly get fixes in to users hands and allow
> better feedback on the status of the release.
> GHC 8.4 is slated to be released in mid-February but, due to technical
> constraints, we are starting the alpha-release cycle a bit later than
> planned under the above schedule. For this reason, it would be greatly
> appreciated if users could put this alpha through its paces to make up
> for lost time.
> As always, do let us know if you encounter any trouble in the
> course of
> testing. Thanks for your help!
> - Ben
>  https://ghc.haskell.org/trac/ghc/blog/2017-release-schedule
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