2.1. Version 9.4.8

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, 13, or 14.

2.1.1. Significant Changes

Issues fixed in this release include:

2.1.1.1. Compiler

  • Fix a recompilation checking bug where GHC may miss changes in transitive dependencies when deciding to relink a program (#23724).

  • Fix a compiler panic resulting from incorrect eta-reduction of join points (#23922).

  • Fix a code generator bug on AArch64 platforms resulting in invalid conditional jumps (#23746).

  • Improve STG code generation in certain scenarios (#23783).

  • Fix a bug where we could silently truncate 64 bit values to 32 bit on 32 bit architectures.

  • Fix -split-sections on Windows (#22834).

2.1.1.2. Runtime system

  • Remove an assertion prone to race conditions (#22563).

  • Fix some crashes and loops with the non-moving GC (#24042, :ghc-ticket:`23003).

  • Properly escape characters when writing JSON profiles (-pJ) (#23924).

2.1.1.3. Build system and packaging

  • Ensure -split-sections is enabled while building binary distributions for all platforms where this is supported (#21135).

  • Make the configure script use AC_PATH_TOOL instead of AC_PATH_PROG to detect tools, making cross-compilation easier (#21601).

  • Fix a bug where -DNOSMP wasn’t being passed to the C compiler even if the target doesn’t support SMP (#24082).

2.1.1.4. Core libraries

  • Bump base to 4.17.2.1

  • Bump bytestring to 0.11.5.3

  • Bump process to 1.6.18.0

2.1.1.5. 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

9.4.8

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

4.17.2.1

Core library

binary

0.8.9.1

Dependency of ghc library

bytestring

0.11.5.3

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

9.4.8

Internal compiler library

ghc-boot

9.4.8

Internal compiler library

ghc-compact

0.1.0.0

Core library

ghc-heap

9.4.8

GHC heap-walking library

ghc-prim

0.9.1

Core library

ghci

9.4.8

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

9.4.8

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

1.6.18.0

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