August 2025 - ghc-devs

CI failures
by Ben Gamari 17 Aug '25

17 Aug '25

Hi all, This morning I found that one of the core services running on gitlab.haskell.org had crashed due to an out-of-memory condition. This resulted in a number of spurious CI failures. I have restarted a few but don't hesitate to restart any that I may have missed. Cheers, - Ben

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9.14 progress update
by Andreas Klebinger 12 Aug '25

12 Aug '25

I'm merely forwarding this from ghc-releases for those not following there: Hi all, A brief update on the GHC 9.14 release status. As noted last time, the release process has been held up by a few significant bodies of on-going work: - the upgrade of the Windows toolchain which has revealed a number of linking issues, - enabling support for LLVM 20 (#26267), along with the resolution of a few correctness issues which were uncovered in the process (#26109) - the resolution to #23109, a rather invasive correctness fix which we want to ensure is adequately tested prior to the release, At this point we have resolved, or are close to resolving, all of these issues. We expect that #23109 will land today, with the resolution to #26109 hopefully landing shortly thereafter. One wrinkle here is a late request for a boot library bump (#26268) which has had a number of knock-on effects. We are still trying to land this in `master`; we tentatively plan to backport but given how the state of the release process we will not delay the release if things do not go smoothly. Once the above has happened we will backport to `ghc-9.14` and begin preparation of the first alpha release. This may happen as soon as Thursday. Cheers, - Ben

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Proposal: Roundtrip serialization of Cmm (parser-compatible pretty-printer output)
by Diego Antonio Rosario Palomino 10 Aug '25

10 Aug '25

>Hi Diego, >In the future it would make things easier if you could use one of the >common email quoting conventions (i.e. starting lines with >). It is >otherwise a bit hard to distinguish your replies from the questions >you are responding to. I am sorry, Ben Gamari. I am not used to working in mailing lists. I also messed up the formatting in my last reply. I accidentally created a second topic (but this comment uses the original topic). Please tell me if this comment uses an appropriate format so I can proceed to answer the rest of your reply. Btw, some months back my first topic on this mailing list just linked to the corresponding Discourse post: https://discourse.haskell.org/t/gsoc-2025-documenting-and-improving-cmm/118… Would it be acceptable to use Discourse for my next topic regarding this project? (Maybe with a link here, on this mailing list.) Diego Antonio Rosario Palomino

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GHC 9.10.3-rc3 is now available
by Zubin Duggal 08 Aug '25

08 Aug '25

The GHC developers are very pleased to announce the availability of the third release candidate for GHC 9.10.3. Binary distributions, source distributions, and documentation are available at [downloads.haskell.org][] and via [GHCup](https://www.haskell.org/ghcup/). GHC 9.10.3 is a bug-fix release fixing over 50 issues of a variety of severities and scopes. 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][]. The changes from the second release candidate are: - Reverting a change the exports of the `Backtrace` constructor in the base library that was backported due to confusion on CLC approvals (!14587) - Reverting a change to the configure script (!14324) that dropped probing for ld.gold This release candidate will have a two-week testing period. If all goes well the final release will be available the week of 22 August 2025. We would like to thank Well-Typed, Tweag I/O, Juspay, QBayLogic, Channable, Serokell, 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://gitlab.haskell.org/ghc/ghc/-/blob/ghc-9.10/docs/users_guide/9.10.3-… [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status [downloads.haskell.org] https://downloads.haskell.org/ghc/9.10.3-rc3 [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new

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GHC 9.10.3-rc2 is now available
by Zubin Duggal 06 Aug '25

06 Aug '25

The GHC developers are very pleased to announce the availability of the second release candidate for GHC 9.10.3. Binary distributions, source distributions, and documentation are available at [downloads.haskell.org][] and via [GHCup](https://www.haskell.org/ghcup/). GHC 9.10.3 is a bug-fix release fixing over 50 issues of a variety of severities and scopes. 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][]. The changes from the first release candidate are: - Bumping the text submodule to 2.1.3 - Reverting a bug fix (!14291) that restricted previously allowed namespace specifiers (#26250) - Reverting the bump of the deepseq submodule to 1.5.2.0 (#26251) This release candidate will have a two-week testing period. If all goes well the final release will be available the week of 19 August 2025. We would like to thank Well-Typed, Tweag I/O, Juspay, QBayLogic, Channable, Serokell, 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://gitlab.haskell.org/ghc/ghc/-/blob/ghc-9.10/docs/users_guide/9.10.3-… [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status [downloads.haskell.org] https://downloads.haskell.org/ghc/9.10.3-rc2 [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new

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Generating fresh names in a source plugin
by Wolfgang Jeltsch 05 Aug '25

05 Aug '25

[Since it seems that `glasgow-haskell-users(a)haskell.org` is essentially an announcements-only mailing list these days, I’m re-sending my recent e-mail to that mailing list here.] Hello! I want to generate AST fragments in a source plugin, and for this I need to generate fresh (local) names. My current approach is to use `mkSystemName`, but it, like many of the other name-generating operations, needs a value of type `Unique`. How can I generate such values? It seems that the `Hsc` monad doesn’t carry a value of type `UniqueSupply` with it. All the best, Wolfgang

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