.. _release-9-4-6:
Version 9.4.6
==============
The significant changes to the various parts of the compiler are listed in the
following sections.
The :ghc-flag:`LLVM backend <-fllvm>` of this release is to be used with LLVM
10, 11, 12, 13, or 14.
Significant Changes
~~~~~~~~~~~~~~~~~~~~
Issues fixed in this release include:
Compiler
--------
- Fix a bug where certain dictionaries for undecidable instances could end up
looping at runtime (:ghc-ticket:`22549`).
- Fix a compiler panic involving newtype family instances (:ghc-ticket:`23329).
- Fix a bug preventing using the command line to compile ``.cmm`` files to
assembly (:ghc-ticket:`23610`).
- Fix compiler panics with certain RULE pragmas (:ghc-ticket:`23208`,
:ghc-ticket:`22761`).
- Fix a loop in the simplifier due to a bug in the representation of certain
fields in interface files (:ghc-ticket:`22272`).
- Make type equality ``(~)`` checks in the presence of quantified contrains more
robust to argument ordering (:ghc-ticket:`23333`).
- Fix some segfaults when using ``UnliftedDataTypes`` (:ghc-ticket:`23231`,
:ghc-ticket:`23146`).
- Improve bounds checking with ``-fcheck-prim-bounds`` (:ghc-ticket:`21054`).
- Fix a bug in the simplifier leading to core lint errors (:ghc-ticket:`23012`).
- Ensure array read operations have proper memory barries (:ghc-ticket:`23541`).
- Fix a spurious ``-dcore-lint`` failure with certain kinds of type family
instances (:ghc-ticket:`22547`).
- Fix a bug with ``.hie`` files containing spurious references to generated
functions in files with partial field selectors (:ghc-ticket:`23492`).
- With the aarch64 backend, fix a bug arising from lack of zero-extension for
8/16 bit add/sub with immediate (:ghc-ticket:`23749`).
- Fix a number of bugs having to do with default representation polymorphic type
variables (:ghc-ticket:`23153`, :ghc-ticket:`23154`, :ghc-ticket:`23176`).
GHCi and Bytecode Interpreter
-----------------------------
- Add support for top-level ``Addr#`` literals (:ghc-ticket:`22376`)
- Fix some tag inference bugs when using the bytecode interpreter
(:ghc-ticket:`22840`).
- Support the ``foreign import prim`` calling convention in the
bytecode interpreter (:ghc-ticket:`22051`).
- Support sized literals in the bytecode interpreter (:ghc-ticket:`21945`).
- Fix a bug with the handling of unboxed tuples in the bytecode interpreter
(:ghc-ticket:`23068`).
- Make the bytecode interpreter more robust when run on optimised code
(:ghc-ticket:`22958`)
Runtime system
--------------
- Accurately account for mutator allocations when using the non-moving GC
(:ghc-ticket:`23312`).
- Prevent some segfaults by ensuring that pinned allocations respect block size
(:ghc-ticket:`23400`).
- Fix warnings with clang 14.0.3 (:ghc-ticket:`23561`).
- On Windows, ensure reliability of IO manager shutdown (:ghc-ticket:`23691`).
- Fix a bug with the GHC linker on windows (:ghc-ticket:`22941`).
Build system and packaging
--------------------------
- Allow building documentation with sphinx 6.0.0 (:ghc-ticket:`22690`).
- Fix a bug with the install scripts that prevented reinstallation of binary
distributions (:ghc-ticket:`23373`).
- Fix some dependency tracking bugs with hadrian (:ghc-ticket:`23554`).
Core libraries
--------------
- Bump ``base`` to 4.17.2.0
- base: Restore``mingwex`` dependency on Windows (:ghc-ticket:`23309`).
- Bump ``process`` to 1.6.17.0
- Bump ``bytestring`` to 0.11.5.1
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.
.. ghc-package-list::
libraries/array/array.cabal: Dependency of ``ghc`` library
libraries/base/base.cabal: Core library
libraries/binary/binary.cabal: Dependency of ``ghc`` library
libraries/bytestring/bytestring.cabal: Dependency of ``ghc`` library
libraries/Cabal/Cabal/Cabal.cabal: Dependency of ``ghc-pkg`` utility
libraries/Cabal/Cabal-syntax/Cabal-syntax.cabal: Dependency of ``ghc-pkg`` utility
libraries/containers/containers/containers.cabal: Dependency of ``ghc`` library
libraries/deepseq/deepseq.cabal: Dependency of ``ghc`` library
libraries/directory/directory.cabal: Dependency of ``ghc`` library
libraries/exceptions/exceptions.cabal: Dependency of ``ghc`` and ``haskeline`` library
libraries/filepath/filepath.cabal: Dependency of ``ghc`` library
compiler/ghc.cabal: The compiler itself
libraries/ghci/ghci.cabal: The REPL interface
libraries/ghc-boot/ghc-boot.cabal: Internal compiler library
libraries/ghc-boot-th/ghc-boot-th.cabal: Internal compiler library
libraries/ghc-compact/ghc-compact.cabal: Core library
libraries/ghc-heap/ghc-heap.cabal: GHC heap-walking library
libraries/ghc-prim/ghc-prim.cabal: Core library
libraries/haskeline/haskeline.cabal: Dependency of ``ghci`` executable
libraries/hpc/hpc.cabal: Dependency of ``hpc`` executable
libraries/integer-gmp/integer-gmp.cabal: Core library
libraries/libiserv/libiserv.cabal: Internal compiler library
libraries/mtl/mtl.cabal: Dependency of ``Cabal`` library
libraries/parsec/parsec.cabal: Dependency of ``Cabal`` library
libraries/pretty/pretty.cabal: Dependency of ``ghc`` library
libraries/process/process.cabal: Dependency of ``ghc`` library
libraries/stm/stm.cabal: Dependency of ``haskeline`` library
libraries/template-haskell/template-haskell.cabal: Core library
libraries/terminfo/terminfo.cabal: Dependency of ``haskeline`` library
libraries/text/text.cabal: Dependency of ``Cabal`` library
libraries/time/time.cabal: Dependency of ``ghc`` library
libraries/transformers/transformers.cabal: Dependency of ``ghc`` library
libraries/unix/unix.cabal: Dependency of ``ghc`` library
libraries/Win32/Win32.cabal: Dependency of ``ghc`` library
libraries/xhtml/xhtml.cabal: Dependency of ``haddock`` executable