[ANNOUNCE] GHC 8.4.2 released

Ben Gamari ben at well-typed.com
Fri Apr 20 00:01:22 UTC 2018

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


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 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,


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:


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

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


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:


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



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:


Mailing lists

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


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


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


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

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