2.5. Version 9.6.5

The significant changes to the various parts of the compiler are listed below. See the migration guide on the GHC Wiki for specific guidance on migrating programs to this release.

The LLVM backend of this release is to be used with LLVM 11, 12, 13, 14 or 15.

2.5.1. Significant Changes

Issues fixed in this release include:

2.5.1.1. Compiler

  • Disable -fasm-shortcutting with -O2 as it leads to unsound optimisations (:ghc-ticket:`24462).

  • Fix a typechecker bug resulting in TYPE and CONSTRAINT being apart (#24279).

  • Fix a bug resulting in incorrect runtime results due to a botched simplifier pass (#24295).

  • Assign correct source spans to nested documentation comments in the AST (#24378).

  • Fix a bug causing suboptimal error messages for certain invalid cyclic module graphs with hs-boot files (#24196, #24275).

  • Fix a bug resulting in infix (~) and (@) operators not being usable in TH quotes (#23748).

  • Fix a bug arising from incorrect parsing of paths containing spaces in the settings file (#24265).

  • Allow special pragmas to desugar correctly in a few more cases (#24370).

2.5.1.2. Runtime system

  • Fix an off-by-one while writing eventlogs (#24287).

  • Avoid segfaults with using -Dn with the non-moving collector (#24393).

2.5.1.3. Build system and packaging

  • Fix a bug resulting in the distributed hsc2hs wrapper using flags from the compiler build environment (#24050).

  • Better compatibility for newer alex versions in the configure script (#24302).

  • Handle autotools adding the -std flag to the CC/CXX variables (#24324).

  • Fix a typo in the configure script resulting in the target for the linker being set incorrectly when configuring a cross-compiler (#24414).

  • Do not override existing linker flags in FP_LD_NO_FIXUP_CHAINS.

  • Ensure the genapply program is built with the write constants when cross compiling (#24347).

  • Ensure we take LDFLAGS into account when configuring a linker (#24565).

  • Fix a segfault with the non-moving GC (#24492).

2.5.1.4. Core libraries

  • Bump base to 4.18.2.1

  • Bump filepath to 1.4.300.1

  • Bump directory to 1.3.8.4

  • Bump Cabal to 3.10.3.0

  • Bump process to 1.6.19.0

  • Bump libffi-tarballs to 3.4.6

2.5.1.5. 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

9.6.5

The compiler itself

Cabal-syntax

3.10.3.0

Dependency of ghc-pkg utility

Cabal

3.10.3.0

Dependency of ghc-pkg utility

Win32

2.13.3.0

Dependency of ghc library

array

0.5.6.0

Dependency of ghc library

base

4.18.2.1

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

1.4.8.1

Dependency of ghc library

directory

1.3.8.4

Dependency of ghc library

exceptions

0.10.7

Dependency of ghc and haskeline library

filepath

1.4.300.1

Dependency of ghc library

ghc-boot-th

9.6.5

Internal compiler library

ghc-boot

9.6.5

Internal compiler library

ghc-compact

0.1.0.0

Core library

ghc-heap

9.6.5

GHC heap-walking library

ghc-prim

0.10.0

Core library

ghci

9.6.5

The REPL interface

haskeline

0.8.2.1

Dependency of ghci executable

hpc

0.6.2.0

Dependency of hpc executable

integer-gmp

1.1

Core library

libiserv

9.6.5

Internal compiler library

mtl

2.3.1

Dependency of Cabal library

parsec

3.1.16.1

Dependency of Cabal library

pretty

1.1.3.6

Dependency of ghc library

process

1.6.19.0

Dependency of ghc library

stm

2.5.1.0

Dependency of haskeline library

template-haskell

2.20.0.0

Core library

terminfo

0.4.1.6

Dependency of haskeline library

text

2.0.2

Dependency of Cabal library

time

1.12.2

Dependency of ghc library

transformers

0.6.1.0

Dependency of ghc library

unix

2.8.4.0

Dependency of ghc library

xhtml

3000.2.2.1

Dependency of haddock executable