[ANNOUNCE] GHC 9.12.1-alpha1 is now available

Wed Oct 16 19:52:44 UTC 2024

It worked for me on my M2 mac but only after uninstalling and reinstalling
Command Line Tools.

Hopefully the problem I had was unique to me. I got an error when I ran
./configure on my M2 mac:

checking C++ standard library flavour... actest.cpp:1:10: fatal error:
'iostream' file not found
    1 | #include <iostream>
      |          ^~~~~~~~~~
1 error generated.
configure: error: Failed to compile test program

Following is the complete output I got

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 (18.1.8) is between 13 and 20... yes
checking for clang-19... no
checking for clang-19.0... no
checking for clang19... no
checking for clang-18... clang-18
checking clang-18 version (18.1.8) is between 13 and 20... yes
configure: $CC is not gcc; assuming it's a reasonably new C compiler
checking whether CC supports -no-pie... no
checking whether CC supports flags passed by GHC when compiling via C... yes
checking Setting up CFLAGS, LDFLAGS, IGNORE_LINKER_LD_FLAGS and CPPFLAGS...
done
checking Setting up CONF_CC_OPTS_STAGE0, CONF_GCC_LINKER_OPTS_STAGE0,
CONF_LD_LINKER_OPTS_STAGE0 and CONF_CPP_OPTS_STAGE0... done
checking Setting up CONF_CC_OPTS_STAGE1, CONF_GCC_LINKER_OPTS_STAGE1,
CONF_LD_LINKER_OPTS_STAGE1 and CONF_CPP_OPTS_STAGE1... done
checking Setting up CONF_CC_OPTS_STAGE2, CONF_GCC_LINKER_OPTS_STAGE2,
CONF_LD_LINKER_OPTS_STAGE2 and CONF_CPP_OPTS_STAGE2... done
checking whether ld64 requires -no_fixup_chains... yes
checking whether ld64 requires -no_fixup_chains... yes
checking whether ld64 requires -no_fixup_chains... yes
checking whether ld64 requires -no_fixup_chains... yes
checking whether the linker requires -no_warn_duplicate_libraries... yes
checking whether the linker requires -no_warn_duplicate_libraries... yes
checking whether the linker requires -no_warn_duplicate_libraries... yes
checking whether ld supports response files... yes
checking C++ standard library flavour... actest.cpp:1:10: fatal error:
'iostream' file not found
    1 | #include <iostream>
      |          ^~~~~~~~~~
1 error generated.
configure: error: Failed to compile test program

On Wed, Oct 16, 2024 at 8:51 AM Zubin Duggal <zubin at well-typed.com> wrote:

> The GHC developers are very pleased to announce the availability
> of the first alpha release of GHC 9.12.1. Binary distributions, source
> distributions, and documentation are available at [downloads.haskell.org
> ][].
>
>
> We hope to have this release available via ghcup shortly.
>
> GHC 9.12 will bring a number of new features and improvements, including:
>
>   * The new language extension [OrPatterns] allowing you to combine
> multiple
>     pattern clauses into one.
>
>   * The [MultilineStrings] language extension to allow you to more easily
> write
>     strings spanning multiple lines in your source code.
>
>   * Improvements to the OverloadedRecordDot extension, allowing the
> built-in
>     `HasField` class to be used for records with fields of non lifted
> representations.
>
>   * The [NamedDefaults] language extension has been introduced allowing
> you to
>     define defaults for typeclasses other than `Num`.
>
>   * More deterministic object code output, controlled by the
> `-fobject-determinism`
>     flag, which improves determinism of builds a lot (though does not
> fully do so)
>     at the cost of some compiler performance (1-2%). See #12935 for the
> details
>
>   * GHC now accepts type syntax in expressions as part of [GHC Proposal
> #281].
>
>   * ... and many more
>
> A full accounting of changes 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][].
>
> We would like to thank GitHub, IOG, the Zw3rk stake pool,
> Well-Typed, 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.
>
>
> [release notes]:
> https://downloads.haskell.org/ghc/9.12.1-alpha1/docs/users_guide/9.12.1-notes.html
> [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status
> [downloads.haskell.org]: https://downloads.haskell.org/ghc/9.12.1-alpha1
> [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new
> [OrPatterns]:
> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0522-or-patterns.rst
> [MultilineStrings]:
> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0569-multiline-strings.rst
> [GHC Proposal #281]:
> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0281-visible-forall.rst
> [NamedDefaults]:
> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0409-exportable-named-default.rst
>
>
> Cheers,
> Zubin
> _______________________________________________
> ghc-devs mailing list
> ghc-devs at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/ghc-devs/attachments/20241016/0ad83a2e/attachment.html>