[ANNOUNCE] GHC 9.6.1-rc1 is now available

Ben Gamari <[email protected]> Fri, 03 Mar 2023 16:57:11 -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 the first
(and likely final) release candidate of GHC 9.6.1. As usual, binaries
and source distributions are available at
[downloads.haskell.org](https://downloads.haskell.org/ghc/9.6.1-rc1/).

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][migration-guide]. 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. If all goes well we expect the final release should be
available by late next week.

Happy Haskelling,

~ 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-rc1/docs/users_guide/9.6.1-notes.html

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