[ANNOUNCE] GHC 9.4.1-rc1 is now available

[George Colpitts]

Hi Ben,

I expected https://gitlab.haskell.org/ghc/ghc/-/issues/21506 (ghc-9.4.1-alpha1
does not install on macos: ghc-pkg-9.4.0-20220501 cannot be opened because
the developer cannot be verified) to be fixed in rc1 but it is not. Are my
expectations wrong? What is the ETA for fixing it?

Thanks
George


On Fri, Jul 22, 2022 at 10:05 AM Ben Gamari <ben at well-typed.com> wrote:

>
> The GHC developers are happy to announce the availability of the first
> (and likely last) release candidate of GHC 9.4.1. Binary distributions,
> source
> distributions, and documentation are available at [downloads.haskell.org].
>
> This major release will include:
>
>  - A new profiling mode, `-fprof-late`, which adds automatic cost-center
>    annotations to all top-level functions *after* Core optimisation has
>    run. This provides informative profiles while interfering
>    significantly less with GHC's aggressive optimisations, making it
>    easier to understand the performance of programs which depend upon
>    simplification..
>
>  - A variety of plugin improvements including the introduction of a new
>    plugin type, *defaulting plugins*, and the ability for typechecking
>    plugins to rewrite type-families.
>
>  - An improved constructed product result analysis, allowing unboxing of
>    nested structures, and a new boxity analysis, leading to less reboxing.
>
>  - Introduction of a tag-check elision optimisation, bringing
>    significant performance improvements in strict programs.
>
>  - Generalisation of a variety of primitive types to be levity
>    polymorphic. Consequently, the `ArrayArray#` type can at long last be
>    retired, replaced by standard `Array#`.
>
>  - Introduction of the `\cases` syntax from [GHC proposal 0302]
>
>  - A complete overhaul of GHC's Windows support. This includes a
>    migration to a fully Clang-based C toolchain, a deep refactoring of
>    the linker, and many fixes in WinIO.
>
>  - Support for multiple home packages, significantly improving support
>    in IDEs and other tools for multi-package projects.
>
>  - A refactoring of GHC's error message infrastructure, allowing GHC to
>    provide diagnostic information to downstream consumers as structured
>    data, greatly easing IDE support.
>
>  - Significant compile-time improvements to runtime and memory consumption.
>
>  - On overhaul of our packaging infrastructure, allowing full
>    traceability of release artifacts and more reliable binary
>    distributions.
>
>  - Reintroduction of deep subsumption (which was previously dropped with
> the
>    *simplified subsumption* change) as a language extension.
>
>  - ... and much more. See the [release notes] for a full accounting.
>
> Note that, as 9.4.1 is the first release for which the released artifacts
> will
> all be generated by our Hadrian build system, it is possible that there
> will be
> packaging issues. If you enounter trouble while using a binary
> distribution,
> please open a [ticket]. Likewise, if you are a downstream packager, do
> consider
> migrating to [Hadrian] to run your build; the Hadrian build system can be
> built
> using `cabal-install`, `stack`, or the in-tree [bootstrap script]. We will
> be
> publishing a blog post describing the migration process to Hadrian in the
> coming weeks.
>
> We would like to thank Microsoft Azure, GitHub, IOG, the Zw3rk
> stake pool, Tweag I/O, Serokell, Equinix, SimSpace, the 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 testing,
>
> - Ben
>
> [downloads.haskell.org]: https://downloads.haskell.org/ghc/9.4.1-rc1/
> [GHC proposal 0302]:
> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0302-cases.rst
> [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new
> [bootstrap script]:
> https://gitlab.haskell.org/ghc/ghc/-/blob/e2520df3fffa0cf22fb19c5fb872832d11c07d35/hadrian/bootstrap/README.md
> [Hadrian]:
> https://gitlab.haskell.org/ghc/ghc/-/blob/e2520df3fffa0cf22fb19c5fb872832d11c07d35/hadrian
> [release notes]:
> https://downloads.haskell.org/~ghc/9.4.1-rc1/docs/users_guide/9.4.1-notes.html
>
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>
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