2.5. Version 9.2.5

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 9, 10, 11, or 12.

2.5.1. Compiler

  • Fix a number of issues with the simplifier leading to core lint errors and suboptimal performance (%s21694, %s21755, %s22114).

  • Fix a sign extension bug resulting in incorrent runtime results on the native aarch64 backend (%s22282).

  • Improve determinism by not inclusing build directories in interface files (%s22162).

  • Fix a code generation panic when using SIMD types with unboxed sums (%s22187).

  • Fix a code generation bug with the native code generator on aarch64 darwin leading to runtime segmentation faults due to an incorrect ABI (%s21964)

2.5.2. Runtime system

  • Fix a bug where attempting to clear the card table of a zero-length array resulted in an integer underflow (%s21962).

2.5.3. Core libraries

  • Bump base to 4.16.3.0.

  • Bump process to 1.6.16.0

  • base: Fix races in the IOManager to do with the setNumCapabilities and closeFdWith functions (%s21651)

2.5.4. 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

9.2.8

The compiler itself

Cabal

3.6.3.0

Dependency of ghc-pkg utility

Win32

2.12.0.1

Dependency of ghc library

array

0.5.4.0

Dependency of ghc library

base

4.16.4.0

Core library

binary

0.8.9.0

Dependency of ghc library

bytestring

0.11.4.0

Dependency of ghc library

containers

0.6.5.1

Dependency of ghc library

deepseq

1.4.6.1

Dependency of ghc library

directory

1.3.6.2

Dependency of ghc library

exceptions

0.10.4

Dependency of ghc and haskeline library

filepath

1.4.2.2

Dependency of ghc library

ghc-boot-th

9.2.8

Internal compiler library

ghc-boot

9.2.8

Internal compiler library

ghc-compact

0.1.0.0

Core library

ghc-heap

9.2.8

GHC heap-walking library

ghc-prim

0.8.0

Core library

ghci

9.2.8

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

9.2.8

Internal compiler library

mtl

2.2.2

Dependency of Cabal library

parsec

3.1.15.0

Dependency of Cabal library

pretty

1.1.3.6

Dependency of ghc library

process

1.6.16.0

Dependency of ghc library

stm

2.5.0.2

Dependency of haskeline library

template-haskell

2.18.0.0

Core library

terminfo

0.4.1.5

Dependency of haskeline library

text

1.2.5.0

Dependency of Cabal library

time

1.11.1.1

Dependency of ghc library

transformers

0.5.6.2

Dependency of ghc library

unix

2.7.2.2

Dependency of ghc library

xhtml

3000.2.2.1

Dependency of haddock executable