GHC 9.12.4 is now available

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Subject: GHC 9.12.4 is now available
MIME-Version: 1.0

The GHC developers are very pleased to announce the release of GHC 9.12.4.
Binary distributions, source distributions, and documentation are available=
 at
[downloads.haskell.org][] and via [GHCup](https://www.haskell.org/ghcup/).

GHC 9.12.4 is a bug-fix release fixing many issues of a variety of
severities and scopes, including:

* Fixed a critical code generation regression where sub-word division produ=
ced
   incorrect results (#26711, #26668), similar to the bug fixed in 9.12.2

* Numerous fixes for register allocation bugs, preventing data corruption
   when spilling and reloading registers
   (#26411, #26526, #26537, #26542, #26550)

* Fixes for several compiler crashes, including issues with CSE (#25468),
   and the simplifier(#26681), implicit parameters (#26451), and the type-c=
lass
   specialiser (#26682)

* Fixed cast worker/wrapper incorrectly firing on INLINE functions (#26903)
 =20
* Fixed LLVM backend miscompilation of bit manipulation operations
   (#20645, #26065, #26109)

* Fixed associated type family and data family instance changes not trigger=
ing
   recompilation (#26183, #26705)

* Fixed negative type literals causing the compiler to hang (#26861)

* Improvements to determinism of compiler output (#26846, #26858)

* Fixes for eventlog shutdown deadlocks (#26573)
   and lost wakeups in the RTS (#26324)

* Fixed split sections support on Windows (#26696, #26494) and the LLVM bac=
kend (#26770)

* Fixes for the bytecode compiler, PPC native code generator, and Wasm back=
end

* The runtime linker now supports COMMON symbols (#6107)

* Improved backtrace support: backtraces for `error` exceptions are now
   evaluated at throw time

* `NamedDefaults` now correctly requires the class to be standard or have an
   in-scope default declaration, and handles poly-kinded classes (#25775, #=
25778, #25882)

* ... and many more

A full accounting of these fixes can be found in the [release notes][]. As
always, GHC's release status, including planned future releases, can be fou=
nd on
the GHC Wiki [status][].

GHC development is sponsored by:

  * [Juspay](https://juspay.com/)
  * [QBayLogic](https://qbaylogic.com/)
  * [Channable](https://www.channable.com/)
  * [Haskell Foundation](https://haskell.foundation/)
  * [Serokell](https://serokell.io/)
  * [Well-Typed](https://well-typed.com/)
  * [Tweag](https://www.tweag.io/)
  * [Dotcom-Monitor](https://www.dotcom-monitor.com/)
  * [LoadView](https://www.loadview-testing.com/)
  * [Web Hosting Buddy](https://webhostingbuddy.com/)
  * [Find My Electric](https://www.findmyelectric.com/)
  * [Standard Chartered](https://www.sc.com)
  * [UpCloud](https://upcloud.com)
  * [Mercury](https://mercury.com)

We would like to thank these sponsors 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://gitlab.haskell.org/ghc/ghc/-/blob/ghc-9.12/docs/us=
ers_guide/9.12.4-notes.rst?ref_type=3Dheads&plain=3D1
[status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status
[downloads.haskell.org]: https://downloads.haskell.org/ghc/9.12.4
[ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new

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