[Haskell] [ANNOUNCE] GHC 8.4.2 released

[Ben Gamari]

Hello everyone,

The GHC team is pleased to announce the availability of GHC 8.4.2. The
source distribution, binary distributions, and documentation for this
release are available at

    https://downloads.haskell.org/~ghc/8.4.2

This release is a bug-fix release, fixing numerous regressions and bugs
present in GHC 8.4.1. These include:

 * A regression resulting in some uses of `Control.Exception.evaluate`
   to be inappropriately optimised away (see #13930)

 * A regression resulting in segmentation faults of programs compiled
   with profiling (#14705)

 * A bug causing runtime system panics while running programs with
   retainer profiling (#14947)

 * The configure scripts now accepts a `--disable-dtrace` option, again
   allowing GHC to be bootstrapped on FreeBSD (#15040)

 * The version number of the `base` package has been bumped to
   4.11.1.0 to reflect the addition of the `GHC.IO.FixIOException` type.
   This interface was added in 8.4.1 but the version bump was missed due to
   an oversight.

 * Support for DWARF debug information has been significantly improved
   (#14894, #14779)

A more thorough list of the changes in this release can be found in the
release notes,

  https://downloads.haskell.org/~ghc/8.4.2/docs/html/users_guide/8.4.2-notes.html

Thanks to everyone who has contributed to developing, documenting, and
testing this release!

As always, let us know if you encounter trouble.


How to get it
~~~~~~~~~~~~~

The easy way is to go to the web page, which should be self-explanatory:

        http://www.haskell.org/ghc/

We supply binary builds in the native package format for many
platforms, and the source distribution is available from the same
place.

Packages will appear as they are built - if the package for your
system isn't available yet, please try again later.


Background
~~~~~~~~~~

Haskell is a standard lazy functional programming language.

GHC is a state-of-the-art programming suite for Haskell.  Included is
an optimising compiler generating efficient code for a variety of
platforms, together with an interactive system for convenient, quick
development.  The distribution includes space and time profiling
facilities, a large collection of libraries, and support for various
language extensions, including concurrency, exceptions, and foreign
language interfaces. GHC is distributed under a BSD-style open source license.

A wide variety of Haskell related resources (tutorials, libraries,
specifications, documentation, compilers, interpreters, references,
contact information, links to research groups) are available from the
Haskell home page (see below).


On-line GHC-related resources
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Relevant URLs on the World-Wide Web:

GHC home page              http://www.haskell.org/ghc/
GHC developers' home page  http://ghc.haskell.org/trac/ghc/
Haskell home page          http://www.haskell.org/


Supported Platforms
~~~~~~~~~~~~~~~~~~~

The list of platforms we support, and the people responsible for them,
is here:

   http://ghc.haskell.org/trac/ghc/wiki/Contributors

Ports to other platforms are possible with varying degrees of
difficulty.  The Building Guide describes how to go about porting to a
new platform:

    http://ghc.haskell.org/trac/ghc/wiki/Building


Developers
~~~~~~~~~~

We welcome new contributors.  Instructions on accessing our source
code repository, and getting started with hacking on GHC, are
available from the GHC's developer's site run by Trac:

  http://ghc.haskell.org/trac/ghc/


Mailing lists
~~~~~~~~~~~~~

We run mailing lists for GHC users and bug reports; to subscribe, use
the web interfaces at

    http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users
    http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-tickets

There are several other haskell and ghc-related mailing lists on
www.haskell.org; for the full list, see

    https://mail.haskell.org/cgi-bin/mailman/listinfo

Some GHC developers hang out on #haskell on IRC, too:

    http://www.haskell.org/haskellwiki/IRC_channel

Please report bugs using our bug tracking system.  Instructions on
reporting bugs can be found here:

    http://www.haskell.org/ghc/reportabug
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