The GHC developers are very pleased to announce the availability of the release candidate for GHC 9.14.2. Binary distributions, source distributions, and documentation are available at [downloads.haskell.org][] and via [GHCup](https://www.haskell.org/ghcup/).
GHC 9.14.2 is a bug-fix release fixing many issues of a variety of severities and scopes, including: * Fixed a CorePrep miscompilation that could project a field out of an absent dictionary, resulting in a segfault (#25924) * Fixed demand analysis giving an absent demand to an argument that was still used by the function's stable unfolding, which could cause a run-time crash (#26416) * Numerous fixes for register allocation and Cmm register-conflict analysis bugs, preventing incorrect code generation and corruption of vector registers when spilling and reloading (#26411, #26526, #26537, #26542, #26550, #26668) * Many NGG fixes on AArch64: `MOVK` clobbering live values (#26980), register clobbering and an incorrect overflow bit in `MUL2` (#27046, #27047), and incorrect sign extension (#26978) and unsigned right shift (#26979) at sub-word widths * Fixed several black hole handling bugs that could lead to deadlocks or crashes in multithreaded programs, showing up as hangs or "END_TSO_QUEUE object entered" errors (#26922, #26936) * Fixed a stack alignment bug on x86 that could cause segfaults or corrupted registers when using AVX/AVX-512 vector code (#26595, #26822) * Fixed an "unknown/strange object" crash in the compacting garbage collector (#27434) * Fixed a regression that caused overloaded functions to no longer be specialised as effectively as in previous releases, hurting runtime performance (#26831) * Fixed exponential-time desugaring of nested `case` expressions (#27383, #20251) * Fixes for several compiler panics, including issues with SetLevels (#26681), the type-class specialiser (#26682), `mkTick` (#26772, #27121) and CoreToStg (#27182, #27386) * Fixed cast worker/wrapper incorrectly firing on INLINE functions (#26903) * Fixed negative type literals causing the compiler to hang (#26861) * Fixed associated type family and data family instance changes not triggering recompilation (#26183, #26705) * Improvements to determinism of compiler output, including the order in which `:info` lists instances (#26846, #26858, #26877, #27532) * Fixed split sections support on Windows (#26696, #26494) and the LLVM backend (#26770) * The JavaScript backend now supports more than 128 registers, fixing runtime `ReferenceError` failures for functions taking very many arguments (#26558) * Fixes for the Wasm backend, and the RISC-V and PowerPC native code generators * ... 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][]. This release candidate will have a two-week testing period. If all goes well the final release will be available the week of 13 August 2026. 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-9.14/docs/users_guide/9.14.2-notes.rst [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status [downloads.haskell.org]: https://downloads.haskell.org/ghc/9.14.2-rc1 [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new
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