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9236047476
**tl;dr** Applying this patch makes Cabal work in Guix environments and ensures that Cabal picks up Haskell packages installed via Guix. Guix makes heavy use of GHC_PACKAGE_PATH to make GHC pickup Haskell packages installed via the Guix package manager. The environment variable is set using native-search-paths from the GHC packages. Unfortunately, upstream Cabal does presently not respect GHC_PACKAGE_PATH. If this environment variable is set, `cabal build` and other commands will terminate. For building packages, Guix does not make much use of cabal-install hence this is not as big of an issue. However, cabal-install does therefore presently not work out-of-the-box in environments created by Guix. For example, in `guix shell` environments. This makes it essentially impossible to use Guix for setting up development environments for Haskell software. Cabal upstream is aware of this issue and a patch exists to workaround this problem. The patch is currently not merged upstream due to issues related to reconfiguration (changing GHC_PACKAGE_PATH between `cabal configure` and `cabal build`). However, I would argue that this edge case is not that relevant for Guix and therefore propose including this patch with the Cabal Guix package. As outlined above, cabal-install is not usable by default presently, and I would therefore argue that this is a major improvement over the current situation. I am willing to work with Cabal upstream to have this issue fixed upstream eventually. Note that this requires patching the GHC package instead of the cabal-install package as Guix uses the version of the Cabal package <https://hackage.haskell.org/package/Cabal> distributed with GHC. See: https://github.com/haskell/cabal/issues/3728 * gnu/packages/haskell-apps.scm (cabal-install): Include patch to support the GHC_PACKAGE_PATH environment variable. Signed-off-by: Sören Tempel <soeren@soeren-tempel.net> Signed-off-by: Lars-Dominik Braun <lars@6xq.net> Change-Id: Ib77ffa937b878690d0e2d8964b534842b99da039 |
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