GHC 9.12.1 is now available

Zubin Duggal <[email protected]> Mon, 16 Dec 2024 15:50:54 +0530
Newsgroups	gmane.comp.lang.haskell.ghc.devel,gmane.comp.lang.haskell.glasgow.user,gmane.comp.lang.haskell.cafe
Message-ID	<ekr3carfz5nni3ttotg4vxycmzvo7y3xgdm75mooxbmrmud5s6@mfajegzz3jxw>
The GHC developers are very pleased to announce the release of GHC 9.12.1.
Binary distributions, source distributions, and documentation are available at
[downloads.haskell.org][].
  
We hope to have this release available via ghcup shortly.
  
GHC 9.12 will bring a number of new features and improvements, including:
  
  * The new language extension [OrPatterns] allowing you to combine multiple
    pattern clauses into one.
  
  * The [MultilineStrings] language extension to allow you to more easily write
    strings spanning multiple lines in your source code.
  
  * Improvements to the OverloadedRecordDot extension, allowing the built-in
    `HasField` class to be used for records with fields of non lifted representations.
  
  * The [NamedDefaults] language extension has been introduced allowing you to
    define defaults for typeclasses other than `Num`.
  
  * More deterministic object code output, controlled by the `-fobject-determinism`
    flag, which improves determinism of builds a lot (though does not fully do so)
    at the cost of some compiler performance (1-2%). See #12935 for the details
  
  * GHC now accepts type syntax in expressions as part of [GHC Proposal #281].
  
  * The WASM backend now has support for TemplateHaskell.
  
  * Experimental support for the RISC-V platform with the native code generator.
  
  * ... and many more
  
A full accounting of changes can be found in the [release notes][].
As always, GHC's release status, including planned future releases, can
be found on the GHC Wiki [status][].
  
We would like to thank GitHub, IOG, the Zw3rk stake pool,
Well-Typed, Tweag I/O, Serokell, Equinix, SimSpace, the Haskell
Foundation, and other anonymous contributors whose on-going financial
and in-kind support has facilitated GHC maintenance and release
management over the years. Finally, this release would not have been
possible without the hundreds of open-source contributors whose work
comprise this release.
  
As always, do give this release a try and open a [ticket][] if you see
anything amiss.
  
  
[release notes]: https://downloads.haskell.org/ghc/9.12.1/docs/users_guide/9.12.1-notes.html
[status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status
[downloads.haskell.org]: https://downloads.haskell.org/ghc/9.12.1
[ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new
[OrPatterns]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0522-or-patterns.rst
[MultilineStrings]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0569-multiline-strings.rst
[GHC Proposal #281]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0281-visible-forall.rst
[NamedDefaults]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0409-exportable-named-default.rst

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