4. Release notes for version 8.10.2¶
The significant changes to the various parts of the compiler are listed in the following sections.
Like previous releases in the 8.10 series, the LLVM backend
of this release is to be used with LLVM 9.
4.1. Highlights¶
A few important correctness fixes for the low-latency garbage collector. Users of
--nonmoving-gcare strongly encouraged to upgrade promptly.Fixes a bug in process creation on Windows (#17926).
Works around a Linux kernel bug in the implementation of
timerfds (#18033).Fixes a few specialiser regressions (#17810, #18120) and introduces a variety of miscellaneous specialiser improvements (#16473, #17930, #17966)
Fixes a potential loss of sharing due to left operator sections (#18151).
Fix bootstrapping of GHC with the LLVM backend on x86-64 (#17920).
4.2. Full details¶
4.2.1. Compiler¶
4.2.2. Runtime system¶
The RTS now supports a flag,
--copying-gc, to counter-act the effect of--nonmoving-gc.The RTS now allows the user to specify a minimum time between idle GCs with the
-Iw ⟨seconds⟩flag. 8.10.1 contained a user’s guide reference to this flag but did not include the associated implementation.A memory leak in the cost-center profiler has been fixed (#18348)
A potential integer overflow in the compact normal form import logic has been fixed (#16992)
We now work around a Linux kernel bug in the implementation of timerfd which could previously result in program crashes (#18033)
The cost-center profiler’s JSON output backend now escapes backslashes correctly (#18438)
A variety of linker issues on ARM platforms have been fixed.
4.2.3. base library¶
Fix a precision issue in the implementation of
log1mexp(#17125)
4.2.4. Build system¶
Fix a bug wherein GHC would link against the non-thread-safe unique supply implementation when bootstrapping with an unregisterised compiler (#18024)
4.3. 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.
4.4. 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 |
8.10.6 | 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 |
8.10.6 | Internal compiler library |
ghc-boot |
8.10.6 | Internal compiler library |
ghc-compact |
0.1.0.0 | Core library |
ghc-heap |
8.10.6 | GHC heap-walking library |
ghc-prim |
0.6.1 | Core library |
ghci |
8.10.6 | 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 |
8.10.6 | 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 |