GHC 9.12 and cabal 3.14 release announcement

content/ghc-9.12-cabal-3.14/index.md

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+title = "GHC 9.12 & Cabal 3.14 releases"
+date = 2024-12-22
+[taxonomies]
+authors = ["Hécate"]
+categories = ["Cabal", "GHC"]
+tags = ["Release"]
++++
+
+To conclude the year 2024, the GHC and Cabal teams are happy to announce the releases of GHC 9.12 and cabal 3.14.
+
+<!-- more -->
+
+
+Here are some highlights:
+
+## GHC 9.12
+
+### Language Extensions
+
+This release brings many new and exciting extensions:
+* [Multiline string literals][MultilineStrings] to write string literals with newlines kept verbatim,
+  enabling multiline strings without the need for string gaps and literal \n characters";
+* [Or-Patterns][OrPatterns], allowing you to match on several patterns in a single `case` branch:
+
+```haskell
+data Sweet = Cupcake | Liquorice | Cookie | Raisins
+
+-- Without Or-Patterns
+tasty Cupcake = True
+tasty Cookie = True
+tasty _ = False
+
+-- With Or-Patterns
+tasty (Cupcake; Cookie) = True
+tasty (Liquorice; Raisins) = False
+```
+
+* [NamedDefaults][NamedDefaults] allows you to create type defaulting declarations for literals other than for the `Num` class. This mechanism is used to make sure that in the expression `print (6 + 7)`, the multiplication gets a concrete type like `Integer`, `Int` or `Double`, instead of the vague  `Num a => a`.  
+You can now apply this mechanism to other typeclasses, like:
+
+```haskell
+default IsString (Text, String)
+```
+
+Which means that in a module with [`OverloadedStrings`][OverloadedStrings], string literals `"like this"` will default to [`Text`][Text]
+instead of triggering an error about a polymorphic type.
+
+### Base Library
+
+* Improvements to backtraces and exceptions. Lots of them.
+
+#### ⚠️ Deprecations
+
+* The deprecation cycle of [GHC.Pack][GHC.Pack] has reached its conclusion and the module has been removed.
+* [GHC.Desugar][GHC.Desugar] will be removed in GHC 9.14.
+
+### Code Generation
+
+* Experimental support for the [RISC-V Platform](https://gitlab.haskell.org/ghc/ghc/-/issues/16783);
+* SIMD! In the x86: Most floating-point operations and some integer vector operations are supported 128-bit vectors **without LLVM**. [Get in touch](https://matrix.to/#/#ghc:matrix.org) to help with this effort
+* You can try the new experimental [`-fobject-determinism`][-fobject-determinism] flag to enable deterministic object code generation.
+
+#### ⚠️ Deprecations
+
+* Support 32-bit Windows & macOS/iOS has been dropped;
+* As a result, the `stdcall` calling convention for FFI has been dropped, `ccall` should be used instead.
+
+You can read the full release notes [here](https://downloads.haskell.org/ghc/9.12.1/docs/users_guide/9.12.1-notes.html).
+
+## Cabal 3.14
+
+### New things
+
+* (Spec v3.14 only) New field: `extra-files` allows you to bundle files in the source distribution (*sdist*) of your cabal package. It serves as an alternative when the files you want to bundle do not fit in the existing `data-files` (for runtime data), `extra-source-files` (built by cabal) or `extra-doc-files` (shipped with Haddocks). This field has no inherent meaning, to avoid misuse of the already existing fields. For instance, you can use `extra-files` to ship `stack.yaml` files, which are not used either by the program at run-time, nor by Cabal or Haddock.
+
+* You can now compile projects dynamically with profiling enabled. The following options are now available:
+  * cabal.project: `profiling-shared: <Boolean>`;
+  * cabal file: `ghc-prof-shared-options` for passing options when building in profiling dynamic way;
+  * Command-line arguments: `--enable-profiling --enable-executable-dynamic`.
+
+* [New GHC options and extensions](https://downloads.haskell.org/ghc/9.12.1/docs/users_guide/9.12.1-notes.html) are supported.
+
+* New build type: Hooks. This build type, intended to eventually replace the Custom build type, integrates better with the rest of the ecosystem (cabal-install, Haskell Language Server).
+
+* The experimental `haddock-project` command supports sub-components.
+
+### Changed
+
+* `cabal init` remembers the chosen language within current session (`Haskell2010`, `GHC2021`, etc.).
+
+* `cabal check` will raise an error about the insecure `git://` protocol in `source-repository`.
+
+* Enable recompilation avoidance during Haddock generation.
+
+* Clarify error message when `pkg-config` is not found.
+
+* Print out which project file(s) we are using.
+
+### Fixed
+
+* The `--promised-dependency` flag now accepts the version of a package in the package name. Previously you could only call it with an argument like `void=void-0.5.8`.
+Now, it is possible to write: `--promised-dependency=void-0.5.8=void-0.5.8`.
+
+* Always pass `ghc-options` to GHC.
+
+* Enhance error detection for cabal root project files, including broken symlinks.
+
+* Don't pass `--coverage-for` for non-dependency libs of a testsuite.
+
+* Fix a bug that causes `cabal init` to crash if `git` is not installed.
+
+### Unresolved
+
+* Recompilation avoidance during Haddock generation sometimes does not work on Windows ([haskell/cabal#9177](https://github.com/haskell/cabal/pull/9177#issuecomment-2167768305)).
+
+You can see the full changelogs for [Cabal & Cabal-syntax](https://github.com/haskell/cabal/blob/master/release-notes/Cabal-3.14.1.0.md), and for [cabal-install and cabal-install-solver](https://github.com/haskell/cabal/blob/master/release-notes/cabal-install-3.14.0.0.md)
+
+As always, the Cabal team is always welcoming of new contributors. We have a nice back catalogue of bugs, oddities and feature requests. Stop by our [matrix channel](https://matrix.to/#/#hackage:matrix.org)!
+
+[MultilineStrings]: https://downloads.haskell.org/ghc/9.12.1/docs/users_guide/exts/multiline_strings.html#multiline-string-literals
+[OrPatterns]: https://downloads.haskell.org/ghc/9.12.1/docs/users_guide/exts/or_patterns.html#or-patterns
+[NamedDefaults]: https://downloads.haskell.org/ghc/9.12.1/docs/users_guide/exts/named_defaults.html#named-default-declarations
+[OverloadedStrings]: https://downloads.haskell.org/ghc/9.12.1/docs/users_guide/exts/overloaded_strings.html
+[Text]: https://hackage.haskell.org/package/text/docs/Data-Text.html#t:Text
+[-fobject-determinism]: https://downloads.haskell.org/ghc/9.12.1/docs/users_guide/using-optimisation.html#ghc-flag-fobject-determinism
+[GHC.Pack]: https://gitlab.haskell.org/ghc/ghc/-/issues/21461
+[GHC.Desugar]: https://hackage.haskell.org/package/base-4.21.0.0/docs/GHC-Desugar.html