[ANNOUNCE] GHC 8.4.3 released

Ben Gamari ben at well-typed.com
Tue May 29 20:07:23 UTC 2018

Hello everyone,

The GHC team is pleased to announce the availability of GHC 8.4.3. The
source distribution, binary distributions, and documentation for this
release are available at


This release includes a few bug fixes including:

 * A code generation bug resulting in crashing of some programs using
   UnboxedSums has been fixed (#15038).

 * #14381, where Cabal and GHC would disagree about abi-depends,
   resulting in build failures, has been worked around. Note that the
   work-around patch has already been shipped by several distributions
   in previous releases, so this change may not be visible to you.

 * By popular demand, GHC now logs a message when it reads a package
   environment file, hopefully eliminating some of the confusion wrought
   by this feature.

 * GHC now emits assembler agreeable to newer versions of Gnu binutils,
   fixing #15068.

 * SmallArray#s can now be compacted into a compact region

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.


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