1. #26564 <https://gitlab.haskell.org/ghc/ghc/-/issues/26564>


On Wed, Nov 12, 2025 at 2:54 AM Zubin Duggal <[email protected]> wrote:

> Can you open a ticket for this please?
>
> On 25/11/11 14:17, George Colpitts wrote:
> >Thanks Zubin. I found a small problem; hopefully it is unique to me:
> >
> > % ghc --version
> >The Glorious Glasgow Haskell Compilation System, version 9.12.2.20251110
> >
> >% ghc -O2 -fllvm prob214ff.hs
> >Loaded package environment from
> >/Users/gcolpitts/.ghc/aarch64-darwin-9.12.2.20251110/environments/default
> >[1 of 2] Compiling Main             ( prob214ff.hs, prob214ff.o ) [Missing
> >object file]
> ><no location info>: warning: [GHC-66599]
> >    GHC was not configured with a supported LLVM toolchain
> >    Make sure you have installed LLVM between [13 and 20) and reinstall
> GHC
> >to ensure -fllvm works
> >
> >
> ><no location info>: error:
> >    Warning: Couldn't figure out LLVM version!
> >             Make sure you have installed LLVM between [13 and 20)
> >
> >
> >Failed to detect LLVM version!
> >Make sure LLVM is installed correctly.
> >We will try though...
> ><no location info>: error: LLVM Optimiser: could not execute:
> >
> >Although llvm 21 is not supported my understanding is that it is supposed
> >to try as it says above. I do have llvm installed:
> >
> > opt --version
> >Homebrew LLVM version 21.1.5
> >  Optimized build.
> >  Default target: arm64-apple-darwin25.1.0
> >  Host CPU: apple-m4
> >(base) gcolpitts@Mac haskell %
> >
> >Plus configure also thinks I have it installed:
> >
> >checking for llc... llc
> >checking llc version (21.1.5) is between 13 and 20... no
> >configure: We only support llvm 13 upto 20 (non-inclusive) *(found
> 21.1.5).*
> >checking for opt-19... no
> >checking for opt-19.0... no
> >checking for opt19... no
> >checking for opt-18... no
> >checking for opt-18.0... no
> >checking for opt18... no
> >checking for opt-17... no
> >checking for opt-17.0... no
> >checking for opt17... no
> >checking for opt-16... no
> >checking for opt-16.0... no
> >checking for opt16... no
> >checking for opt-15... no
> >checking for opt-15.0... no
> >checking for opt15... no
> >checking for opt-14... no
> >checking for opt-14.0... no
> >checking for opt14... no
> >checking for opt-13... no
> >checking for opt-13.0... no
> >checking for opt13... no
> >checking for opt... opt
> >checking opt version (21.1.5) is between 13 and 20... no
> >configure: We only support llvm 13 upto 20 (non-inclusive)
> >checking for llc... llc
> >checking llc version (21.1.5) is between 13 and 20... no
> >configure: We only support llvm 13 upto 20 (non-inclusive) *(found
> 21.1.5).*
> >checking for opt-19... no
> >checking for opt-19.0... no
> >checking for opt19... no
> >checking for opt-18... no
> >checking for opt-18.0... no
> >checking for opt18... no
> >checking for opt-17... no
> >checking for opt-17.0... no
> >checking for opt17... no
> >checking for opt-16... no
> >checking for opt-16.0... no
> >checking for opt16... no
> >checking for opt-15... no
> >checking for opt-15.0... no
> >checking for opt15... no
> >checking for opt-14... no
> >checking for opt-14.0... no
> >checking for opt14... no
> >checking for opt-13... no
> >checking for opt-13.0... no
> >checking for opt13... no
> >checking for opt... opt
> >checking opt version (21.1.5) is between 13 and 20... no
> >configure: We only support llvm 13 upto 20 (non-inclusive) *(found
> 21.1.5).*
> >
> >Suggestions?
> >
> >Thanks
> >George
> >
> >
> >On Tue, Nov 11, 2025 at 4:02 AM Zubin Duggal <[email protected]>
> wrote:
> >
> >> The GHC developers are very pleased to announce the availability
> >> of the second release candidate for GHC 9.12.3. Binary distributions,
> >> source
> >> distributions, and documentation are available at [
> downloads.haskell.org][]
> >> and
> >> via [GHCup](https://www.haskell.org/ghcup/).
> >>
> >> GHC 9.12.3 is a bug-fix release fixing several 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][].
> >>
> >> This release candidate will have a two-week testing period. If all goes
> >> well
> >> the final release will be available the week of 24 November 2025.
> >>
> >> The changes from the first release candidate are
> >>
> >> * Fix a regression resulting in a panic with empty cases (#26442,
> #25960).
> >> * Fix for a potential segfault in the bytecode interpreter (#23210).
> >> * Fix for a regression with tabs not being allowed in string gaps
> (#26415).
> >> * Fix for a crash with the non-moving GC (#26204).
> >> * A rework of how internal symbols used by the code-generator are
> handled
> >> to
> >>    adapt to changes in the Apple toolchain, enabling this release to
> >> bootstrap on
> >>    macOS 26 Tahoe (#26166).
> >>
> >> 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)
> >>
> >> We would like to that 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-9.12/docs/users_guide/9.12.3-notes.rst?ref_type=heads&plain=1
> >> [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status
> >> [downloads.haskell.org]: https://downloads.haskell.org/ghc/9.12.3-rc2
> >> [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new
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