[Haskell] [ANNOUNCE] GHC 9.2.4 released

[George Colpitts]

Thanks Zubin, this is good news.

On a Mac when do ./configure I see

checking Xcode version... xcode-select: error: tool 'xcodebuild' requires
Xcode, but active developer directory '/Library/Developer/CommandLineTools'
is a command line tools instance

not found (too old?)

I assume I can ignore that but FWIW it's weird as I do have that
directory and it is not old:


$ ls -ld /Library/Developer/CommandLineTools
drwxr-xr-x@ 5 root  wheel  160 27 May 20:54
/Library/Developer/CommandLineTools

$ xcode-select --version
xcode-select version 2395.


On a Mac it is still necessary to do

xattr -rc .

before doing

sudo make install


this is also true for 9.4.1-rc1 which I noted in 21506
<https://gitlab.haskell.org/ghc/ghc/-/issues/21506>.

Thanks
George





On Thu, Jul 28, 2022 at 8:17 AM Zubin Duggal <zubin at well-typed.com> wrote:

> The GHC developers are very happy to at announce the availability of GHC
> 9.2.4. Binary distributions, source distributions, and documentation are
> available at [`downloads.haskell.org`](
> https://downloads.haskell.org/ghc/9.2.4).
>
> Download Page: https://www.haskell.org/ghc/download_ghc_9_2_4.html
> Blog Post:
> https://www.haskell.org/ghc/blog/20220728-ghc-9.2.4-released.html
>
> This release will include:
>
>   - The new `DeepSubsumption` language extension which reverses the
>     effects of the [Simplified Subsumption Proposal] introduced in GHC
> 9.0. This
>     is an attempt to make GHC 9.2.4 more backwards compatible with GHC
> 8.10 and
>     eases migration for users who depended on this feature.
>
>     This extension is enabled by default with the `Haskell2010`
>     and `Haskell98` languages but disabled with the `GHC2021`
>     language originally introduced in GHC 9.2.1.
>
>     See the [Deep Subsumption Proposal] for more details.
>
>   - Fixes for segfaults that may arise due to a bug in the implementation
> of the
>     `keepAlive#` primop. This may regress performance for certain programs
> which
>     use this primop or functions which use the primop, such as
> `withForeignPtr`.
>     These regressions are mostly small, but can be larger in certain edge
> cases.
>     Judicious use of `unsafeWithForeignPtr` when its argument is known not
> to
>     statically diverge can mitigate these in many cases. It is our
> judgment that
>     the critical correctness issues justify the regression in performance
> and that
>     it is important to get a release out with the fix while we work on a
> better
>     approach which will improve performance for future releases (#21708).
>
>     We have a [wiki page](
> https://gitlab.haskell.org/ghc/ghc/-/wikis/proposal/with-combinator)
>     that tracks possible solutions to this problem, and Ben wrote a
>     [blog post](
> https://www.haskell.org/ghc/blog/20210607-the-keepAlive-story.html)
>     detailing the introduction of the `keepAlive#` primop and its history.
>
>   - Fixes for a number of miscompilations on AArch64 and other platforms
> (#21624,
>     #21773, #20735, #21685).
>
>   - Fixes for segfaults due to bugs in the RTS and GC (#21708, #21880,
> #21885).
>
>   - Fixing the behaviour of Ctrl-C with GHCi on Windows (#21889).
>
>    - ... and much more. See the [release notes] for a full accounting.
>
> 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, 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 compiling,
>
> - Zubin
>
> [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new
> [release notes]:
> https://downloads.haskell.org/~ghc/9.2.4/docs/users_guide/9.2.4-notes.html
> [Simplified Subsumption Proposal]:
> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0287-simplify-subsumption.rst
> [Deep Subsumption Proposal]:
> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0511-deep-subsumption.rst
> _______________________________________________
> Glasgow-haskell-users mailing list
> Glasgow-haskell-users at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users
>
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