GHC 9.12.4 is now available

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.

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 produced
  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-class
  specialiser (#26682)

• Fixed cast worker/wrapper incorrectly firing on INLINE functions (#26903)

• Fixed LLVM backend miscompilation of bit manipulation operations
  (#20645, #26065, #26109)

• Fixed associated type family and data family instance changes not triggering
  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 backend (#26770)

• Fixes for the bytecode compiler, PPC native code generator, and Wasm backend

• 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 found on
the GHC Wiki status.

GHC development is sponsored by:

• Juspay
• QBayLogic
• Channable
• Haskell Foundation
• Serokell
• Well-Typed
• Tweag
• Dotcom-Monitor
• LoadView
• Web Hosting Buddy
• Find My Electric
• Standard Chartered
• UpCloud
• Mercury

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.