Re: GHC 9.12.3-rc2 is now available

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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>

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