GHC 9.6.4 is now available

The GHC developers are happy to announce the availability of GHC 9.6.4. Binary
distributions, source distributions, and documentation are available on the
release page.

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

  • A fix for a bug where certain warnings flags were not recognised (#24071)
  • Fixes for a number of simplifier bugs (#23952, #23862).
  • Fixes for compiler panics with certain package databases involving unusable
    units and module reexports (#21097, #16996, #11050).
  • A fix for a typechecker crash (#24083).
  • A fix for a code generator bug on AArch64 platforms resulting in invalid
    conditional jumps (#23746).
  • Fixes for some memory leaks in GHCi (#24107, #24118)
  • And a few other 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.

Happy hacking!



Congratulations for the release!

I have updated Stack’s default setup-info dictionary for these binary distributions, and added GHC 9.6.4’s global hints to global-hints.yaml.



Fedora users can now install ghc9.6-9.6.4 from the Fedora updates & EPEL 9 repos.

Stackage LTS is now on ghc-9.6.4 as of lts-22.7 released today