GHC 8.6.3 is a bug-fix release, fixing a few regressions found in 8.6.1 and 8.6.2. As some of these issues are soundness issues users are strongly encouraged to upgrade.
The highlights, since the 8.6.2 release, are:
Note that the LLVM code generator (-fllvm) in GHC 8.6, as well as all earlier releases, are affected by Trac #14251, which can result in miscompilation of some programs calling functions with unboxed floating-point arguments. While originally scheduled to be fixed for this release, the fix ended up being more difficult than anticipated and, given that issue is not a strict regression from 8.4, we decided to proceed with the release.
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 | 8.6.4 | The compiler itself |
| Cabal | 2.4.0.1 | Dependency of ghc-pkg utility |
| Win32 | 2.6.1.0 | Dependency of ghc library |
| array | 0.5.3.0 | Dependency of ghc library |
| base | 4.12.0.0 | Core library |
| binary | 0.8.6.0 | Dependency of ghc library |
| bytestring | 0.10.8.2 | Deppendency of ghc library |
| containers | 0.6.0.1 | Dependency of ghc library |
| deepseq | 1.4.4.0 | Dependency of ghc library |
| directory | 1.3.3.0 | Dependency of ghc library |
| filepath | 1.4.2.1 | Dependency of ghc library |
| ghc-boot | 8.6.4 | Internal compiler library |
| ghc-compact | 0.1.0.0 | Core library |
| ghc-prim | 0.5.3 | Core library |
| ghci | 8.6.4 | The REPL interface |
| haskeline | 0.7.4.3 | Dependency of ghci executable |
| hpc | 0.6.0.3 | Dependency of hpc executable |
| integer-gmp | 1.0.2.0 | Core library |
| mtl | 2.2.2 | Dependency of Cabal library |
| parsec | 3.1.13.0 | Dependency of Cabal library |
| process | 1.6.5.0 | Dependency of ghc library |
| template-haskell | 2.14.0.0 | Core library |
| text | 1.2.3.1 | Dependency of Cabal library |
| time | 1.8.0.2 | 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 |