Magnus pushed to branch ghc-9.12 at Glasgow Haskell Compiler / GHC Commits: 6132cc92 by mangoiv at 2026-06-02T12:47:17+02:00 release 9.12.5: write release notes - - - - - 2 changed files: - + docs/users_guide/9.12.5-notes.rst - docs/users_guide/release-notes.rst Changes: ===================================== docs/users_guide/9.12.5-notes.rst ===================================== @@ -0,0 +1,134 @@ +.. _release-9-12-5: + +Version 9.12.5 +============== + +The significant changes to the various parts of the compiler are listed in the +following sections. See the `migration guide +<https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/9.12>`_ on the GHC Wiki +for specific guidance on migrating programs to this release. + +Compiler +~~~~~~~~ + +This release of GHC supports LLVM versions 13 through 19. + +- When there are no remaining argument demands, bottoming applications are now being trimmed to avoid panics (:ghc-ticket:`27261`) +- Implement version 2 of the ghc ``semaphore`` protocol for GHC's ``-jsem`` jobserver on Linux and other ``POSIX`` platforms (:ghc-ticket:`25087`, :ghc-ticket:`27253`) +- several improvements to the pattern match checker (:ghc-ticket:`25926`, :ghc-ticket:`27124`) +- Avoid putting ticks around coercions (:ghc-ticket:`27121`) +- Let the driver recognise ``.dyn_o`` as valid object files to allow plugins with this suffix to run. (:ghc-ticket:`24486`) +- Don't move ticks in between a join point and its jumps (:ghc-ticket:`26929`, :ghc-ticket:`26642`, :ghc-ticket:`26693`) +- Remove ``StgAsyncResult`` to fix crash/leaks (:ghc-ticket:`26341`) +- ffi: collapse void pointer chains in capi wrappers (:ghc-ticket:`26852`) +- aarch64: fix ``MOVK reguUsageOfInstr`` to mark dst as both read and written (:ghc-ticket:`26980`) +- Fix ``dsuppress-uniques`` for free variables in demand signatures (:ghc-ticket:`27106`) +- demand analysis: take stable unfoldings into account when determining argument demands (:ghc-ticket:`26416`) + +Runtime System +~~~~~~~~~~~~~~ + +- prevent the WinIO manager from swallowing exceptions in overlapped ``IO`` (:ghc-ticket:`27283`) +- several fixes for blackholes (:ghc-ticket:`27261`) +- add ``--optimistic-linking`` flag which binds unknown symbols in the runtime linker to ``0xDEADBEEF`` instead of failing (:ghc-ticket:`25240`) +- add a few missing i386 relocations in the rts linker +- handle heap allocation failures in I/O primops (:ghc-ticket:`24105`) +- small fixes to allow more configurations to succesfully build (debugging RTS with optimizations) +- fix race conditions between ``flushEventLog`` acquiring/releasing the ``state_change`` mutex +- align stack to 64-byte boundary in StgRun on x65 (:ghc-ticket:`26595`, ghc-ticket:`26822`) +- carefully SLIDE off the end of a stack chunk (:ghc-ticket:`27001`) +- Fix missing profiling header for origin_thunk frame (:ghc-ticket:`27007`) + + +Code Generation +~~~~~~~~~~~~~~~ + +- aarch64: use ``ASR`` not ``LSR`` for ``MO_U_Shr`` at ``W8/W16`` (:ghc-ticet:`26979`) +- fix finalizers on multiple platforms (:ghc-ticket:`27072`) + +Bytecode Compiler +~~~~~~~~~~~~~~~~~ + +``base`` library +~~~~~~~~~~~~~~~~ + +``ghc-internal`` library +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +- update to unicode 17.0.0 + +``ghc-experimental`` library +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + + +``ghc-pkg`` +~~~~~~~~~~~~ + +``ghc-toolchain`` +~~~~~~~~~~~~~~~~~ + +Packaging and Build System +~~~~~~~~~~~~~~~~~~~~~~~~~~ + +- bumped ``process`` submodule to 1.6.29.0 +- bumped ``semaphore-compat`` submodule to 2.0.0 +- accept ``happy`` version 2.2 +- hadrian: don't include package hash in haddock library +- configure: fix check for ``--target`` support in stage0 ``CC`` (:ghc-ticket:`26999`) + +Wasm Backend +~~~~~~~~~~~~ + +- ensure post-linker output is synchronous ESM (:ghc-ticket:`27257`) + +Included libraries +~~~~~~~~~~~~~~~~~~ + +The package database provided with this distribution also contains a number of +packages other than GHC itself. See the changelogs provided with these packages +for further change information. + +.. ghc-package-list:: + + compiler/ghc.cabal: The compiler itself + libraries/array/array.cabal: Dependency of ``ghc`` library + libraries/base/base.cabal: Core library + libraries/binary/binary.cabal: Dependency of ``ghc`` library + libraries/bytestring/bytestring.cabal: Dependency of ``ghc`` library + libraries/Cabal/Cabal/Cabal.cabal: Dependency of ``ghc-pkg`` utility + libraries/Cabal/Cabal-syntax/Cabal-syntax.cabal: Dependency of ``ghc-pkg`` utility + libraries/containers/containers/containers.cabal: Dependency of ``ghc`` library + libraries/deepseq/deepseq.cabal: Dependency of ``ghc`` library + libraries/directory/directory.cabal: Dependency of ``ghc`` library + libraries/exceptions/exceptions.cabal: Dependency of ``ghc`` and ``haskeline`` library + libraries/file-io/file-io.cabal: Dependency of ``directory`` library + libraries/filepath/filepath.cabal: Dependency of ``ghc`` library + libraries/ghc-boot/ghc-boot.cabal: Internal compiler library + libraries/ghc-boot-th/ghc-boot-th.cabal: Internal compiler library + libraries/ghc-compact/ghc-compact.cabal: Core library + libraries/ghc-experimental/ghc-experimental.cabal: Core library + libraries/ghc-heap/ghc-heap.cabal: GHC heap-walking library + libraries/ghci/ghci.cabal: The REPL interface + libraries/ghc-internal/ghc-internal.cabal: Core library + libraries/ghc-platform/ghc-platform.cabal: Internal library + libraries/ghc-prim/ghc-prim.cabal: Core library + libraries/haskeline/haskeline.cabal: Dependency of ``ghci`` executable + libraries/hpc/hpc.cabal: Dependency of ``hpc`` executable + libraries/integer-gmp/integer-gmp.cabal: Core library + libraries/mtl/mtl.cabal: Dependency of ``Cabal`` library + libraries/os-string/os-string.cabal: Dependency of ``filepath`` library + libraries/parsec/parsec.cabal: Dependency of ``Cabal`` library + libraries/pretty/pretty.cabal: Dependency of ``ghc`` library + libraries/process/process.cabal: Dependency of ``ghc`` library + libraries/semaphore-compat/semaphore-compat.cabal: Dependency of ``ghc`` library + libraries/stm/stm.cabal: Dependency of ``haskeline`` library + libraries/template-haskell/template-haskell.cabal: Core library + libraries/terminfo/terminfo.cabal: Dependency of ``haskeline`` library + libraries/text/text.cabal: Dependency of ``Cabal`` library + libraries/time/time.cabal: Dependency of ``ghc`` library + libraries/transformers/transformers.cabal: Dependency of ``ghc`` library + libraries/unix/unix.cabal: Dependency of ``ghc`` library + libraries/Win32/Win32.cabal: Dependency of ``ghc`` library + libraries/xhtml/xhtml.cabal: Dependency of ``haddock`` executable + utils/haddock/haddock-api/haddock-api.cabal: Dependency of ``haddock`` executable + utils/haddock/haddock-library/haddock-library.cabal: Dependency of ``haddock`` executable ===================================== docs/users_guide/release-notes.rst ===================================== @@ -8,3 +8,4 @@ Release notes 9.12.2-notes 9.12.3-notes 9.12.4-notes + 9.12.5-notes View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/6132cc920f9aa803b72a790f33d4ef86... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/6132cc920f9aa803b72a790f33d4ef86... 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