[ANNOUNCE] GHC 8.4.1-alpha1 available

George Colpitts george.colpitts at gmail.com
Thu Dec 21 20:16:01 UTC 2017

Thanks Ben. I installed the Mac binaries.

For others who are wondering, you need llvm 5 if you want to use llvm with

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


On Wed, Dec 20, 2017 at 4:48 PM Ben Gamari <ben at well-typed.com> wrote:

> The GHC development team is pleased to announce the first alpha release
> of the 8.4.1 release. The usual release artifacts are available from
>     https://downloads.haskell.org/~ghc/8.4.1-alpha1
> 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 provided
> 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 [1]. Under this new scheme,
> major releases will be made in 6-month intervals with interstitial minor
> 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!
> Cheers,
> - Ben
> [1] https://ghc.haskell.org/trac/ghc/blog/2017-release-schedule
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