2.2. Version 9.4.4

The significant changes to the various parts of the compiler are listed in the following sections.

The LLVM backend of this release is to be used with LLVM 10, 11, 12, or 13.

2.2.1. Significant Changes

Issues fixed in this release include:

  • An issue where the wrong labels were used in the eventlog for events emitted when using info table profiling which was broken in 9.4.3. (#22452)

  • Fix a long standing bug where invalid eventlogs would be produced with long command lines. (#20221)

  • Fix another mistake in eta-expansion which resulted in serious performance regressions in 9.4.3. (#22424)

  • Fix the -fdefer-diagnostics. (#22391)

  • Fixes to several subtle compiler panics. (#22491, #22416, #22549, #22475, #22039)

  • Add correct write barries to IORef operations. (#22468)

  • The toolchain provided with Windows binary distributions now searches for its own headers and libraries before those of the host system’s msys2 installation (#22561)

2.2.1.1. Included libraries

The package database provided with this distribution also contains a number of packages other than GHC itself. See the changelogs provided with these packages for further change information.

Package Version Reason for inclusion

ghc

9.4.5

The compiler itself

Cabal-syntax

3.8.1.0

Dependency of ghc-pkg utility

Cabal

3.8.1.0

Dependency of ghc-pkg utility

Win32

2.12.0.1

Dependency of ghc library

array

0.5.4.0

Dependency of ghc library

base

4.17.1.0

Core library

binary

0.8.9.1

Dependency of ghc library

bytestring

0.11.4.0

Dependency of ghc library

containers

0.6.7

Dependency of ghc library

deepseq

1.4.8.0

Dependency of ghc library

directory

1.3.7.1

Dependency of ghc library

exceptions

0.10.5

Dependency of ghc and haskeline library

filepath

1.4.2.2

Dependency of ghc library

ghc-boot-th

9.4.5

Internal compiler library

ghc-boot

9.4.5

Internal compiler library

ghc-compact

0.1.0.0

Core library

ghc-heap

9.4.5

GHC heap-walking library

ghc-prim

0.9.0

Core library

ghci

9.4.5

The REPL interface

haskeline

0.8.2

Dependency of ghci executable

hpc

0.6.1.0

Dependency of hpc executable

integer-gmp

1.1

Core library

libiserv

9.4.5

Internal compiler library

mtl

2.2.2

Dependency of Cabal library

parsec

3.1.16.1

Dependency of Cabal library

pretty

1.1.3.6

Dependency of ghc library

process

1.6.16.0

Dependency of ghc library

stm

2.5.1.0

Dependency of haskeline library

template-haskell

2.19.0.0

Core library

terminfo

0.4.1.5

Dependency of haskeline library

text

2.0.2

Dependency of Cabal library

time

1.12.2

Dependency of ghc library

transformers

0.5.6.2

Dependency of ghc library

unix

2.7.3

Dependency of ghc library

xhtml

3000.2.2.1

Dependency of haddock executable