The Cabal team is excited to announce the release of cabal-install 3.4. This is
the third release of the 3.0 release series, bringing a support for the
`Cabal-Version: 3.4` `.cabal` file format. This introduces a number of
user-facing features including:
- Support for GHC 9.0
- Package sublibrary dependency syntax
- Allowing omission of the `default-language` declaration
- A mixins field allowing the user to specify a sublibrary
- [Many other features](
https://cabal.readthedocs.io/en/latest/file-format-changelog.html#cabal-version-3-4
)
In addition, the `cabal-install` frontend itself has gained a number of new
features including:
- New `active-repositories` `cabal.project` fields allowing users to specify an
order and various ways of combining package repositories
- Improvements to `cabal init`
- A rework of the `cabal v2-sdist` command. `cabal v1-sdist` is removed as of
this version
- `source-repository-package` directories are no longer local
- A new `list-bin` command
- `cabal sandbox` is now removed in favor of default nix-style builds
- `cabal list` now accepts regular expressions
- More rich `index-state` syntax. `v2-freeze` saves `index-state`
I'd also like to thank the many contributors who offered patches, tickets, and
other help in the preparation of this release. We appreciate all of your help!
For a full set of release notes, see
https://github.com/haskell/cabal/blob/master/release-notes/cabal-install-3.4.0.0.md.
If you have issues, we'd love to hear about there here:
https://github.com/haskell/cabal/issues.
Happy hacking!
Emily
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