Re: GHC 9.12.3-rc2 is now available

Somehow when I created the bug I deleted /label ~bug /label ~"needs triage" Editing and adding them doesn't work. Can someone fix this? Thanks George On Wed, Nov 12, 2025 at 10:35 AM George Colpitts wrote:

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

On Wed, Nov 12, 2025 at 2:54 AM Zubin Duggal wrote:

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Can you open a ticket for this please?

On 25/11/11 14:17, George Colpitts wrote:

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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 wrote:

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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 _______________________________________________ ghc-devs mailing list -- ghc-devs@haskell.org To unsubscribe send an email to ghc-devs-leave@haskell.org