.. _release-9-8-3:
Version 9.8.3
==============
The :ghc-flag:`LLVM backend <-fllvm>` of this release is to be used with LLVM
11, 12, 13, 14 or 15.
Significant Changes
~~~~~~~~~~~~~~~~~~~~
Issues fixed in this release include:
Compiler
--------
- Fixed a bug that caused GHC to panic when using the AArch64 ncg and :ghc-flag:`-fregs-graph`
on certain programs (:ghc-ticket:`24941`).
- Fix invalid optimisation of Cmm programs on 32-bit platforms when targetting 64-bit targets (:ghc-ticket:`24893` and :ghc-ticket:`24700`)
- Improve float-out surrounding applications of ``runRW#`` (:ghc-ticket:`25055`)
- Fix :ghc-flag:`-fregs-graph` crash when targetting AArch64 (:ghc-ticket:`24941`)
- Fix native code generator miscompilation of signed sub-word arguments of FFI calls on x86 (:ghc-ticket:`25018`)
- Fix code generation of foreign exports with more than 6 arguments when some are subword-width (:ghc-ticket:`24314`)
- Fix recompilation avoidance behavior of :ghc-flag:`-fwrite-if-simplified-core` (:ghc-ticket:`24656`)
- Fix linking error when :extension:`TypeData` and :extension:`StrictData` are in use (:ghc-ticket:`24620`)
- Fix miscompilation by x86 native code generator due to shortcutting (:ghc-ticket:`24507`)
- Fix uses of ``(~)`` and ``(@)`` being rejected in :extension:`TemplateHaskell` splices (:ghc-ticket:`23748`)
Runtime system
--------------
- Significantly improve performance of code loading via dynamic linking (:ghc-ticket:`23415`)
- Internal fragmentation incurred by the non-moving garbage collector's allocator has been reduced for small objects.
In one real-world application, this has reduced resident set size by about 20% and modestly improved run-time.
See :ghc-ticket:`23340`.
:rts-flag:`--nonmoving-dense-allocator-count=⟨count⟩` has been added to fine-tune this behaviour.
- Fix runtime crash of the :rts-flag:`nonmoving garbage collector <--nonmoving-gc>` due to weak pointers with static key (:ghc-ticket:`24492`)
- Allow heap profiling when the :rts-flag:`--nonmoving-gc` is in use
GHCi
----
- Fix a crash involving use of field selectors in GHCi (:ghc-ticket:`25109`)
JavaScript backend
------------------
- Fix compiler crash involving rubbish literals (:ghc-ticket:`25177`, :ghc-ticket:`24664`)
``base``
--------
- Bump version to 4.19.2.0
- Fix spurious closing of file descriptors after ``fork`` on platforms using the KQueue event manager backend (:ghc-ticket:`24672`)
Haddock
-------
- Fix source links to hyperlinked sources output (:ghc-ticket:`24086`)
Other Core Libraries
--------------------
- Bump ``stm`` to 2.5.3.1
- Bump ``deepseq`` to 1.5.1.0
- Bump ``array`` to 0.5.8.0
- Bump ``Cabal`` to 3.10.3.0
- Bump ``directory`` to 1.3.8.5
- Bump ``process`` to 1.6.25.0
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/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/semaphore-compat/semaphore-compat.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