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Oct 12, 2026
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Add GHCJS deprecation notice #12429

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13 changes: 13 additions & 0 deletions release-notes/Cabal-3.18.2.0.md
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Original file line number Diff line number Diff line change
@@ -1,6 +1,19 @@
Cabal and Cabal-syntax 3.18.2.0 changelog and release notes
---

### Notice

- GHCJS support is deprecated [#11609](https://github.com/haskell/cabal/issues/11609) [#12396](https://github.com/haskell/cabal/pull/12396)

This is the last release series that knows about the GHCJS compiler.
The next major release removes the `Distribution.Simple.GHCJS` module,
the `--ghcjs` flag, the `ghcjs` and `ghcjs-pkg` programs and the GHCJS
build paths. The `ghcjs-options` family of fields in package
descriptions will still parse but have no effect.

Use the JavaScript backend of GHC instead, for example
`--with-compiler=javascript-unknown-ghcjs-ghc`.

### Significant changes

- Mark `CabalSpecV3_18` as the latest supported specification [#12271](https://github.com/haskell/cabal/issues/12271) [#12273](https://github.com/haskell/cabal/pull/12273)
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11 changes: 11 additions & 0 deletions release-notes/cabal-install-3.18.2.0.md
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Expand Up @@ -46,6 +46,17 @@ cabal-install 3.18.2.0 changelog and release notes
flags: -pkg-config +bundled-c-zlib
```

- GHCJS support is deprecated [#11609](https://github.com/haskell/cabal/issues/11609) [#12396](https://github.com/haskell/cabal/pull/12396)

This is the last release series that knows about the GHCJS compiler.
The next major release removes the `--ghcjs` flag, the `ghcjs` and
`ghcjs-pkg` programs and the GHCJS build paths, and selecting
`compiler: ghcjs` will fail with an error. The `ghcjs-options` family
of fields in package descriptions will still parse but have no effect.

Use the JavaScript backend of GHC instead, for example
`--with-compiler=javascript-unknown-ghcjs-ghc`.

### Important changes

- Fix `renameFileWithRetry` leaving temporary files after copying [#12244](https://github.com/haskell/cabal/issues/12244) [#12246](https://github.com/haskell/cabal/pull/12246)
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