9. Release notes for version 8.10.7¶
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 versions 9
through 12.
9.1. Portability fixes¶
Actually fix a linking portability issue on macOS that resulted in undefined symbol errors for
___darwin_check_fd_set_overflow(#19950), working around a bug in certain versions of XCode 11. We claimed to have fixed this in GHC 8.10.6, but alas this wasn’t the case. The fix was originally tested on the master branch, which uses a different build configuration from the 8.10 branch. We have now tested the fix on the GHC 8.10 branch and finally squashed the bug.
9.2. Known issues¶
A long-standing bug (#16893) which can cause some applications of
unsafeCoerceto segmentation fault is only partially fixed in this release. This release only avoids this issue in the uses ofunsafeCoerceinData.Typeable.Internal, which was the proximate cause of #16893.However, it is possible that this bug could manifest in user-code using
unsafeCoerceto perform dynamic type checks. See the ticket for details.We expect that this issue will be fixed in the next major release of GHC.
A long-standing bug (#17760) where some uses of the
touch#primop can be dropped by the simplifier is present in this release. This bug will be fixed in GHC 9.0.1. In the meantime, see the ticket for mitigations.
9.3. 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 |
8.10.7 | The compiler itself |
Cabal |
3.2.1.0 | Dependency of |
Win32 |
2.6.2.1 | Dependency of |
array |
0.5.4.0 | Dependency of |
base |
4.14.3.0 | Core library |
binary |
0.8.8.0 | Dependency of |
bytestring |
0.10.12.0 | Dependency of |
containers |
0.6.5.1 | Dependency of |
deepseq |
1.4.4.0 | Dependency of |
directory |
1.3.6.0 | Dependency of |
exceptions |
0.10.4 | Dependency of |
filepath |
1.4.2.1 | Dependency of |
ghc-boot-th |
8.10.7 | Internal compiler library |
ghc-boot |
8.10.7 | Internal compiler library |
ghc-compact |
0.1.0.0 | Core library |
ghc-heap |
8.10.7 | GHC heap-walking library |
ghc-prim |
0.6.1 | Core library |
ghci |
8.10.7 | The REPL interface |
haskeline |
0.8.2 | Dependency of |
hpc |
0.6.1.0 | Dependency of |
integer-gmp |
1.0.3.0 | Core library |
libiserv |
8.10.7 | Internal compiler library |
mtl |
2.2.2 | Dependency of |
parsec |
3.1.14.0 | Dependency of |
pretty |
1.1.3.6 | Dependency of |
process |
1.6.13.2 | Dependency of |
stm |
2.5.0.1 | Dependency of |
template-haskell |
2.16.0.0 | Core library |
terminfo |
0.4.1.4 | Dependency of |
text |
1.2.4.1 | Dependency of |
time |
1.9.3 | Dependency of |
transformers |
0.5.6.2 | Dependency of |
unix |
2.7.2.2 | Dependency of |
xhtml |
3000.2.2.1 | Dependency of |