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  "path": "/t/ghc-9-12-4-is-now-available/13852#post_1",
  "publishedAt": "2026-03-27T12:20:25.000Z",
  "site": "https://discourse.haskell.org",
  "tags": [
    "downloads.haskell.org",
    "GHCup",
    "release notes",
    "status",
    "Juspay",
    "QBayLogic",
    "Channable",
    "Haskell Foundation",
    "Serokell",
    "Well-Typed",
    "Tweag",
    "Dotcom-Monitor",
    "LoadView",
    "Web Hosting Buddy",
    "Find My Electric",
    "Standard Chartered",
    "UpCloud",
    "Mercury",
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  "textContent": "The GHC developers are very pleased to announce the release of GHC 9.12.4.\nBinary distributions, source distributions, and documentation are available at\ndownloads.haskell.org and via GHCup.\n\nGHC 9.12.4 is a bug-fix release fixing many issues of a variety of\nseverities and scopes, including:\n\n  * Fixed a critical code generation regression where sub-word division produced\nincorrect results (#26711, #26668), similar to the bug fixed in 9.12.2\n\n  * Numerous fixes for register allocation bugs, preventing data corruption\nwhen spilling and reloading registers\n(#26411, #26526, #26537, #26542, #26550)\n\n  * Fixes for several compiler crashes, including issues with CSE (#25468),\nand the simplifier(#26681), implicit parameters (#26451), and the type-class\nspecialiser (#26682)\n\n  * Fixed cast worker/wrapper incorrectly firing on INLINE functions (#26903)\n\n  * Fixed LLVM backend miscompilation of bit manipulation operations\n(#20645, #26065, #26109)\n\n  * Fixed associated type family and data family instance changes not triggering\nrecompilation (#26183, #26705)\n\n  * Fixed negative type literals causing the compiler to hang (#26861)\n\n  * Improvements to determinism of compiler output (#26846, #26858)\n\n  * Fixes for eventlog shutdown deadlocks (#26573)\nand lost wakeups in the RTS (#26324)\n\n  * Fixed split sections support on Windows (#26696, #26494) and the LLVM backend (#26770)\n\n  * Fixes for the bytecode compiler, PPC native code generator, and Wasm backend\n\n  * The runtime linker now supports COMMON symbols (#6107)\n\n  * Improved backtrace support: backtraces for `error` exceptions are now\nevaluated at throw time\n\n  * `NamedDefaults` now correctly requires the class to be standard or have an\nin-scope default declaration, and handles poly-kinded classes (#25775, #25778, #25882)\n\n  * … and many more\n\n\n\n\nA full accounting of these fixes can be found in the release notes. As\nalways, GHC’s release status, including planned future releases, can be found on\nthe GHC Wiki status.\n\nGHC development is sponsored by:\n\n  * Juspay\n  * QBayLogic\n  * Channable\n  * Haskell Foundation\n  * Serokell\n  * Well-Typed\n  * Tweag\n  * Dotcom-Monitor\n  * LoadView\n  * Web Hosting Buddy\n  * Find My Electric\n  * Standard Chartered\n  * UpCloud\n  * Mercury\n\n\n\nWe would like to thank these sponsors and other anonymous contributors\nwhose on-going financial and in-kind support has facilitated GHC maintenance\nand release management over the years. Finally, this release would not have\nbeen possible without the hundreds of open-source contributors whose work\ncomprise this release.\n\nAs always, do give this release a try and open a ticket if you see\nanything amiss.",
  "title": "GHC 9.12.4 is now available"
}