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GHC 9.12 release schedule and submodule status
by Zubin Duggal 11 Nov '24

11 Nov '24

Cc Bcc: Subject: 9.12 schedule and submodule status Hi all, I'm writing to your in your role as a maintainer of one of the GHC boot packages. This is an update on the 9.12 release schedule. We plan to have the release out by the end of the month (ideally on 29/11/24), with an alpha/rc every week from now until the release is finalised: | Date | Event | | ----------------- | -------- | | Nov 15 2024 | alpha 3 | | Nov 22 2024 | release candidate | | Nov 29 2024 | final | Additionally, this is the final call for any submodule bumps that may be desired. The current status of the submodules is described in this spreadsheet, under the GHC 9.12 tab: https://docs.google.com/spreadsheets/d/19WeWjXPh8Q64qoe3fjs8AswpTHk6uLBD8WG… If any version that is not listed in the spreadsheet is desired, please notify me and ensure that a release is tagged and uploaded to hackage as soon as possible. I would like to finalise the state of submodules by the first release candidate. This email is individually addressed to the maintainers of all the boot libraries, as best as we could collate such a list. If you are aware of any changes to the list of GHC boot packages maintainers, please let us know. We aim to have a more systematic process for such communications with library maintainers for releases in the future. Once we finalise such a process we will let you know. Thanks for all your work, Zubin.

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9.12.1-alpha2 and submodule status
by Zubin Duggal 01 Nov '24

01 Nov '24

Hi all, I am currently in the process of preparing 9.12.1-alpha2. I expect a release to be published by the end of this week. We are tracking the current status of the submodules in this spreadsheet: https://docs.google.com/spreadsheets/d/19WeWjXPh8Q64qoe3fjs8AswpTHk6uLBD8WG… I want to finalise submodule versions by the next alpha in 2 weeks. If you have any requests for newer versions of submodules/boot libraries, please update the spreadsheet and drop me a message. Cheers, Zubin

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GHC 9.8.3 plans
by Ben Gamari 30 Sep '24

30 Sep '24

Hi all, I am currently in the process of preparing our next release in the 9.8 series, 9.8.3. This release will include well over 70 backports. As I am a bit less than half-way through the backport process I have currently scheduled the release date for Wednesday 16 October 2024. I have included a list of currently-planned backports below (however it is possible that some of those in the to-do section may be dropped due to feasibility). If you know of anything else which you suspect should be backported do let me know on this thread and by applying the usual ~"backport needed:9.8" label. Cheers, - Ben # Already backported * [x] !12748: rts: fix checkClosure error message * [x] !12734: Various rts fixes for issues spotted by UndefinedBehaviorSanitizer * [x] !13252: Bump submodule array to 0.5.8.0 * [x] !13240: Bump submodule deepseq to 1.5.1.0 * [x] !13306: ci: Fix variable inheritence for ghcup-metadata testing job * [x] !13276: Fix interaction between fork and kqueue (#24672) * [x] !13151: JS: support rubbish static literals (#25177) * [x] !13113: AARCH64 linker: skip NONE relocations * [x] !13096: Cmm: don't perform unsound optimizations on 32-bit compiler hosts (#24893 #24700) * [x] !13091: GHCi debugger: drop record name spaces for Ids * [x] !13070: Only lookup ghcversion.h file in the RTS include-dirs by default. * [x] !13038: Address #25055, by disabling case-of-runRW# in Gentle phase * [x] !13010: Linker: Add windows R_X86_64_PC64 relocation support * [x] !12990: Fix -freg-graphs for FP and AARch64 NCG (#24941). * [x] !12885: PPC NCG: Fix sign hints in C calls * [x] !12975: X86 NCG: Fix argument promotion in foreign C calls * [x] !12914: Linker: use m32 allocator for sections when NEED_PLT (#24432) * [x] !12784: compiler: emit NaturallyAligned when element type & index type are the same width * [x] !12773: GHCi interpreter: Tag constructor closures when possible. * [x] !12713: user_guide: Fix typo in MultiWayIf chapter * [x] !12665: Add missing parenthesizePat in cvtp * [x] !12655: Reverse arguments to stgCallocBytes (fix #24828) * [x] !12574: doc: Fix type error in hs_try_putmvar example * [x] !12558: Add test cases for #24664 * [x] !12484: compiler: Fingerprint -fwrite-if-simplified-core * [x] !12463: JS: correctly handle RUBBISH literals (#24664) * [x] !12459: Don't depend on registerPackage function in Cabal * [x] !12432: Fix ghc API link in docs/index.html # To-do * [ ] !13237: Add `IsBootInterface` to finder cache keys * [ ] !12756: WIP: GHC.Cmm.Opt: Fix overflow on 32bit hosts (error) * [ ] !12639: Bump os-string submodule to 2.0.2.2 * [ ] !12607: refactor quadratic search in warnMissingHomeModules * [ ] !12603: Compatibility with 9.8.1 as boot compiler (error) * [ ] !12548: driver: always merge objects when possible * [ ] !12514: Track in-scope variables in ruleCheckProgram * [ ] !12500: GHCi: support cross-module inlining of breakpoints (#24712) * [ ] !12416: Don't generate wrappers for `type data` constructors with StrictData * [ ] !12370: NCG: Fix a bug where we errounously removed a required jump instruction. * [ ] !12344: Fix off by one error in seekBinNoExpand and seekBin * [ ] !12328: Improve the duplicate-tyvar check * [ ] !12321: Fix type of _get_osfhandle foreign import * [ ] !12313: driver: force merge objects when building dynamic objects * [ ] !12308: JS: fix for h$appendToHsString (#24495) * [ ] !12299: libffi-tarballs: bump libffi-tarballs submodule to libffi 3.4.6 * [ ] !12282: configure: Use LDFLAGS when trying linkers * [ ] !12264: rts: Lookup symbols in relevant DLLs only (originally !11164) * [ ] !12256: NCG: Fix a bug in jump shortcutting. * [ ] !12227: rts: fix clang compilation on aarch64 * [ ] !12184: Use "module" instead of "library" when applicable in base haddocks * [ ] !12177: Update correct counter in bumpTickyAllocd * [ ] !12162: driver: Make `checkHomeUnitsClosed` faster * [ ] !12161: Fix haddock source links and hyperlinked source * [ ] !12158: x86-ncg: Fix fma codegen when arguments are globals. * [ ] !12146: rts: avoid checking bdescr of value outside of Haskell heap * [ ] !12122: Improve base library synopsis and description * [ ] !12116: rel-eng/fetch-gitlab.py: Fix name of aarch64 alpine 3_18 release job * [ ] !12042: rts: only collect live words in nonmoving census when non-concurrent * [ ] !12016: Enhance documentation of Data.Complex * [ ] !12011: Add @since annotation to Data.Data.mkConstrTag * [ ] !11989: Fix ffi callbacks with >6 args and non-64bit args. * [ ] !11938: Escape multiple arguments in the settings file * [ ] !11575: configure: Do not override existing linker flags in FP_LD_NO_FIXUP_CHAINS * [ ] !11548: Update the unification count in wrapUnifierX * [ ] !11541: Compability with 9.8.1 as boot compiler (error) * [ ] !11384: hadrian: Move hsc2hs wrapper generation to bindist installation * [ ] !11383: testsuite: Run some tests unconditionally in nonmoving ways (error) * [ ] !11285: Draft: hadrian: Update bootstrap plans (error) * [ ] !11181: Bump Haddock to fix #23616 [GHC 9.8 branch] (error) * [ ] !10995: Fix (~) and (@) infix operators in TH splices (#23748) * [ ] !10890: nonmoving: Add support for heap profiling * [ ] !10659: nonmoving: introduce a family of dense allocators * [ ] !10523: Add missing BCO handling in scavenge_one (#23375) * [ ] !10417: StgToByteCode: Don't assume that data con workers are nullary (error) * [ ] !9762: nativeGen/AArch64: Fix graph-colouring register allocator

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[ANNOUNCE] GHC 9.10.1-alpha3 is now available
by Ben Gamari 16 Apr '24

16 Apr '24

The GHC developers are very pleased to announce the availability of the third alpha release of GHC 9.10.1. Binary distributions, source distributions, and documentation are available at https://downloads.haskell.org/ghc/9.10.1-alpha3 We hope to have this release available via ghcup shortly. GHC 9.10 will bring a number of new features and improvements, including: * The introduction of the `GHC2024` language edition, building upon `GHC2021` with the addition of a number of widely-used extensions. * Partial implementation of the [GHC Proposal #281], allowing visible quantification to be used in the types of terms. * [Extension] of LinearTypes to allow linear `let` and `where` bindings ([linear let]) * The implementation of the [exception backtrace proposal], allowing the annotation of exceptions with backtraces, as well as other user-defined context * Further improvements in the info table provenance mechanism, reducing code size to allow IPE information to be enabled more widely * Javascript FFI support in the WebAssembly backend * Improvements in the fragmentation characteristics of the low-latency non-moving garbage collector. * ... and many more A full accounting of changes 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 alpha is the penultimate prerelease leading to 9.10.1. In two weeks we plan to publish a release candidate, followed, if all things go well, by the final release a week later. We would like to thank GitHub, IOG, the Zw3rk stake pool, Well-Typed, Tweag I/O, Serokell, Equinix, SimSpace, the Haskell Foundation, 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. Cheers, ~ Ben [release notes]: https://downloads.haskell.org/ghc/9.10.1-alpha3/docs/users_guide/9.10.1-not… [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status [exception backtrace]: https://github.com/ghc-proposals/ghc-proposals/pull/330 [GHC Proposal #281]: https://github.com/ghc-proposals/ghc-proposals/pull/281 [linear let]: https://github.com/ghc-proposals/ghc-proposals/pull/624 [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new

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[ANNOUNCE] GHC 9.10.1-alpha2 is now available
by Ben Gamari 30 Mar '24

30 Mar '24

The GHC developers are very pleased to announce the availability of the second alpha release of GHC 9.10.1. Binary distributions, source distributions, and documentation are available at https://downloads.haskell.org/ghc/9.10.1-alpha2 We hope to have this release available via ghcup shortly. GHC 9.10 will bring a number of new features and improvements, including: * The introduction of the `GHC2024` language edition, building upon `GHC2021` with the addition of a number of widely-used extensions. * Partial implementation of the [GHC Proposal #281], allowing visible quantification to be used in the types of terms. * [Extension] of LinearTypes to allow linear `let` and `where` bindings ([linear let]) * The implementation of the [exception backtrace proposal], allowing the annotation of exceptions with backtraces, as well as other user-defined context * Further improvements in the info table provenance mechanism, reducing code size to allow IPE information to be enabled more widely * Javascript FFI support in the WebAssembly backend * Improvements in the fragmentation characteristics of the low-latency non-moving garbage collector. * ... and many more A full accounting of changes 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]. We would like to thank GitHub, IOG, the Zw3rk stake pool, Well-Typed, Tweag I/O, Serokell, Equinix, SimSpace, the Haskell Foundation, 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://downloads.haskell.org/ghc/9.10.1-alpha2/docs/users_guide/9.10.1-not… [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status [exception backtrace]: https://github.com/ghc-proposals/ghc-proposals/pull/330 [GHC Proposal #281]: https://github.com/ghc-proposals/ghc-proposals/pull/281 [linear let]: https://github.com/ghc-proposals/ghc-proposals/pull/624 [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new

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[ANNOUNCE] GHC 9.10.1-alpha1 is now available
by Ben Gamari 15 Mar '24

15 Mar '24

The GHC developers are very pleased to announce the availability of the first alpha release of GHC 9.10.1. Binary distributions, source distributions, and documentation are available at https://downloads.haskell.org/ghc/9.10.1-alpha1 We hope to have this release available via ghcup shortly. GHC 9.10 will bring a number of new features and improvements, including: * The introduction of the GHC2024 language edition, building upon GHC2021 with the addition of a number of widely-used extensions. * Partial implementation of the [GHC Proposal #281], allowing visible quantification to be used in the types of terms. * Extension of LinearTypes to allow linear `let` and `where` bindings ([linear-let]) * The implementation of the exception backtrace proposal, allowing the annotation of exceptions with backtraces, as well as other user-defined context [exception backtrace] * Further improvements in the info table provenance mechanism, reducing code size to allow IPE information to be enabled more widely * Javascript FFI support in the WebAssembly backend * Improvements in the fragmentation characteristics of the low-latency non-moving garbage collector. * ... and many more A full accounting of changes 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]. Many will notice that this release comes a fair bit later than the previously-announced schedule. While this delay has been attributable to a variety factors, the most recent cause is a set of issues with GHC 9.10's binary distributions on Windows (#24542). Instead of continuing to hold up the release process while we sort out this situation, we have instead provided this alpha without the usual assortment of Windows binary distributions. We expect to have this resolved by alpha 2; apologies to eager Windows testers for this delay. We would like to thank GitHub, IOG, the Zw3rk stake pool, Well-Typed, Tweag I/O, Serokell, Equinix, SimSpace, the Haskell Foundation, 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. Happy compiling, ~ Ben [release notes]: https://downloads.haskell.org/ghc/9.10.1-alpha1/docs/users_guide/9.10.1-not… [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status [exception backtrace]: https://github.com/ghc-proposals/ghc-proposals/pull/330 [GHC Proposal #281]: https://github.com/ghc-proposals/ghc-proposals/pull/281 [linear let]: https://github.com/ghc-proposals/ghc-proposals/pull/624

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GHC 9.10.1 alpha 1 delay
by Ben Gamari 01 Mar '24

01 Mar '24

Hi all, Unfortunately due to persistent trouble merging the last few patches destined for 9.10.1-alpha1 I will need to delay the release by a few days. As I will be away for the first two days of next week I will be delaying by one week, placing the new alpha 1 release date on 7 March 2024. Cheers, - Ben

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GHC 9.10 release schedule and core library status
by Ben Gamari 23 Feb '24

23 Feb '24

Hi all, First, apologies for the silence regarding the 9.10 fork; I was hoping to improve our communications with boot library authors in the run-up to GHC 9.10 but illness unfortunately took me largely out of commission for a first few weeks of the year. Happily, things are looking rosier now. Having had a chance to look at the 9.10 branch and the release goals, I am planning to cut the fork for GHC 9.10 around a month from today, on 23 Februrary 2024. This leaves around a month of time to merge the `ghc-internals` split and a few of the other bits of work that remain outstanding. We anticipate the first alpha release will come a week after the fork (see the Milestone [1] for further details). How does this sound to you? For organizational purposes, it would be helpful if we designated a coordinating maintainer for each of our boot packagers for the 9.10 release. My understanding is that our boot libraries have the following primary maintainers but don't hesitate to let me know if you believe this to be incorrect: | Package | Maintainer | | --------------- | -------------------------- | | Cabal | Mikolaj Konarski | | Win32 | Tamar Christina | | array | (orphaned) | | binary | Lennart Kolmodin? | | bytestring | Andrew Lelechanko | | containers | David Feuer | | deepseq | Melanie Phoenix | | directory | Phil Rufflewind | | exceptions | Ryan Scott | | filepath | Julian Ospald | | haddock | Hecate | | haskeline | Judah Jacobson | | hpc | David Binder | | mtl | Emily Pillmore | | parsec | Oleg Grenrus | | process | Michael Snoyman | | stm | Simon Marlow | | terminfo | Judah Jacobson | | text | Andrew Lelechanko | | time | Ashley Yakeley | | transformers | Ross Paterson | | unix | Julian Ospald | It would be great if each maintainer could let me know what they would like to do for the 9.10 release. In general we would love to have the set of boot libraries pinned down at least in version by the second alpha, which we are planning for the second week of March 2024. Does this sound reasonable? As always, I would encourage core library maintainers to be conservative in their plans for a GHC release and avoid introducing major features or refactorings in their release. Such changes both add risk to the release schedule and complicate the users' migration paths; consequently, they are ideally best held for releases asynchronous to the GHC release process. Thanks again for all of your work! Cheers, - Ben [1] https://gitlab.haskell.org/ghc/ghc/-/milestones/380#tab-issues

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[ANNOUNCE] GHC 9.8.1 is now available
by Ben Gamari 10 Oct '23

10 Oct '23

The GHC developers are very pleased to announce the availability of the final release of GHC 9.8.1. Binary distributions, source distributions, and documentation are available at downloads.haskell.org: https://downloads.haskell.org/ghc/9.8.1 GHC 9.8 brings a number of new features and improvements, including: * Preliminary support the `TypeAbstractions` language extension, allowing types to be bound in type declarations [TypeAbstractions]. * Support for the `ExtendedLiterals` extension, providing syntax for non-word-sized numeric literals in the surface language [extended-literals] * Improved rewrite rule matching behavior, allowing limited matching of higher-order patterns * Better support for user-defined warnings by way of the `WARNING` pragma [warnings] * The introduction of the new `GHC.TypeError.Unsatisfiable` constraint, allowing more predictable user-defined type errors [unsatisfiable] * Implementation of the export deprecation proposal, allowing module exports to be marked with `DEPRECATE` pragmas [deprecated-exports] * The addition of build semaphore support for parallel compilation; with coming support in `cabal-install` this will allow better use of parallelism in multi-package builds [jsem] * More efficient representation of info table provenance information, reducing binary sizes by over 50% in some cases when `-finfo-table-map` is in use A full accounting of changes can be found in the [release notes][]. Plans for GHC's future releases can be found on the [GHC Wiki][status]. We would like to thank GitHub, IOG, the Zw3rk stake pool, Well-Typed, Tweag I/O, Serokell, Equinix, SimSpace, the Haskell Foundation, 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. Happy compiling, ~ Ben [TypeAbstractions]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0425-d… [extended-literals]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0451-s… [unsatisfiable]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0433-u… [warnings]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0541-w… [deprecated-exports]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0134-d… [jsem]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0540-j… [release notes]: https://downloads.haskell.org/ghc/9.8.1/docs/users_guide/9.8.1-notes.html [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status

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[ANNOUNCE] GHC 9.8.1-rc1 is now available
by Ben Gamari 30 Sep '23

30 Sep '23

The GHC developers are very pleased to announce the availability of the release candidate of GHC 9.8.1. Binary distributions, source distributions, and documentation are available at https://downloads.haskell.org/ghc/9.8.1-rc1 GHC 9.8 will bring a number of new features and improvements, including: * Preliminary support the `TypeAbstractions` language extension, allowing types to be bound in type declarations [TypeAbstractions]. * Support for the `ExtendedLiterals` extension, providing syntax for non-word-sized numeric literals in the surface language [extended-literals] * Improved rewrite rule matching behavior, allowing limited matching of higher-order patterns * Better support for user-defined warnings by way of the `WARNING` pragma [warnings] * The introduction of the new `GHC.TypeError.Unsatisfiable` constraint, allowing more predictable user-defined type errors [unsatisfiable] * Implementation of the export deprecation proposal, allowing module exports to be marked with `DEPRECATE` pragmas [deprecated-exports] * The addition of build semaphore support for parallel compilation; with coming support in `cabal-install` this will allow better use of parallelism in multi-package builds [jsem] * More efficient representation of info table provenance information, reducing binary sizes by over 50% in some cases when `-finfo-table-map` is in use A full accounting of changes can be found in the [release notes]. This candidate includes roughly 20 new commits relative to alpha 4, including what we believe should be nearly the last changes to GHC's boot libraries. As always, GHC's release status can be found on the GHC Wiki [status]. We would like to thank GitHub, IOG, the Zw3rk stake pool, Well-Typed, Tweag I/O, Serokell, Equinix, SimSpace, the Haskell Foundation, 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. Happy compiling, ~ Ben [TypeAbstractions]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0425-d… [extended-literals]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0451-s… [unsatisfiable]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0433-u… [warnings]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0541-w… [deprecated-exports]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0134-d… [jsem]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0540-j… [release notes]: https://downloads.haskell.org/ghc/9.8.1-alpha4/docs/users_guide/9.8.1-notes… [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status

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