2.7. Version 9.2.7

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.

2.7.1. Compiler

  • Fix a bug related to placeholder values (rubbish literals) emitted by the worker/wrapper optimisation leading to -dcore-lint errors and compiler panics in certain cases (#19882, #22914, #23000).

  • Fix a bug with the graph-colouring register allocater leading to compiler panics when compiling with -fregs-graph on AArch64 platforms with the native code generator. A fix was also attempted in GHC 9.2.6 but was incomplete (#22798, #23002).

2.7.2. Runtime system

  • Fix a bug with the RTS linker being unable to resolve the setKeepCAFs symbol which started being used by the GHC library in 9.2.6, resulting in code depending on this symbol failing to load in GHCi or via a compile time splice when using a statically linked GHC, such as on Windows (#22961).

  • Fix a bug with the alignment of RTS data structures that could result in segfaults when compiled with high optimisation settings on certain platforms (#22975 , #22965).

  • Fix a RTS bug resulting in segfaults while using cost center profiling on code that uses the newArrayArray# primop (#22129).

  • Use C11 compatible static assertion syntax (#22777).

2.7.3. Build system and packaging

  • Remove quarantine attribute when installing binary distribution on MacOS (#21506, #23009).

  • Enable SMP on powerp64{le} (#19825).

2.7.4. 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

9.2.7

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

9.2.7

Internal compiler library

ghc-boot

9.2.7

Internal compiler library

ghc-compact

0.1.0.0

Core library

ghc-heap

9.2.7

GHC heap-walking library

ghc-prim

0.8.0

Core library

ghci

9.2.7

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

9.2.7

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