GHC 9.6.6 is now available

Zubin Duggal - 2024-07-01

The GHC developers are happy to announce the availability of GHC 9.6.6. Binary distributions, source distributions, and documentation are available on the release page.

This release is primarily a bugfix release addressing some issues found in the 9.6 series. These include:

• A fix for a bug in the NCG that could lead to incorrect runtime results due to erroneously removing a jump instruction (#24507).
• A fix for a linker error that manifested on certain platform/toolchain combinations, particularly darwin with a brew provisioned toolchain, arising due to a confusion in linker options between GHC and cabal (#22210).
• A fix for a compiler panic in the simplifier due to incorrect eta expansion (#24718).
• A fix for possible segfaults when using the bytecode interpreter due to incorrect constructor tagging (#24870).
• And a few more fixes

A full accounting of changes can be found in the release notes. As some of the fixed issues do affect correctness users are encouraged to upgrade promptly.

We would like to thank Microsoft Azure, GitHub, IOG, the Zw3rk stake pool, Well-Typed, Tweag I/O, Serokell, Equinix, SimSpace, 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.

Enjoy!

-Zubin