[ANNOUNCE] GHC 9.6.1-alpha3 is now available

Ben Gamari <[email protected]> Tue, 14 Feb 2023 08:39:08 -0500

Newsgroups	gmane.comp.lang.haskell.ghc.devel,gmane.comp.lang.haskell.glasgow.user,gmane.comp.lang.haskell.cafe
Message-ID	<[email protected]>

The GHC team is very pleased to announce the availability of GHC 9.6.1-alpha3.
As usual, binaries and source distributions are available at
downloads.haskell.org:

    https://downloads.haskell.org/ghc/9.6.1-alpha3/

Beginning with GHC 9.6.1, GHC can be built as a cross-compiler to
WebAssembly and JavaScript. This is an important step towards robust
support for compiling Haskell to the Web, but there are a few caveats to
be aware of in the 9.6 series:

 - Both the Javascript and WebAssembly backends are still at an early
   stage of development and are present in this release as a technology preview

 - Using GHC as a cross-compiler is not as easy as we would like it to
   be; in particular, there are challenges related to Template Haskell

 - GHC is not yet run-time retargetable; a given GHC binary targets
   exactly one platform, and both WebAssembly and JavaScript are considered
   platforms for this purpose. Cross-compilers must be built from source by
   their users

We hope to lift all of these limitations in future releases.

Additionally, 9.6.1 will include:

 - Significant latency improvements in the non-moving garbage collector

 - Efficient runtime support for delimited continuations

 - Improvements in compiler error messages

 - Numerous improvements in the compiler's memory usage

See the [release notes] for a comprehensive accounting of changes in this
release.

As always, one can find a [migration guide] to aid in transitioning from older
releases on the GHC Wiki. We have also recently started extending our
release process to cover a wider set of Linux distributions. In
particular, we now offer Rocky 8 and Ubuntu 20.04 binary distributions
which cover RedHat-derivative and distributions using older `glibc`
releases (namely 2.27), respectively.

Please do give this release a try and open a [ticket] if you see anything
amiss.

Cheers,

- Ben


[ticket]: https://gitlab.haskell.org/ghc/ghc/issues/
[migration guide]: https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/9.6
[release notes]: https://downloads.haskell.org/ghc/9.6.1-alpha3/docs/users_guide/9.6.1-notes.html

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