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| author | Sören Tempel <soeren@soeren-tempel.net> | 2023-12-19 11:05:32 +0100 |
|---|---|---|
| committer | Lars-Dominik Braun <lars@6xq.net> | 2024-06-29 08:56:16 +0200 |
| commit | 9236047476e728b9ae1746d56b8547e023f72307 (patch) | |
| tree | 9567d2f8d42015960889a515b0d2508e10fac6da /tests/composer.scm | |
| parent | 208c2d63bb13c26c45a18e1d9e430fa3c5c3fadf (diff) | |
| download | guix-9236047476e728b9ae1746d56b8547e023f72307.tar.gz guix-9236047476e728b9ae1746d56b8547e023f72307.zip | |
gnu: ghc-9.2: Make Cabal respect GHC_PACKAGE_PATH
**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
Diffstat (limited to 'tests/composer.scm')
0 files changed, 0 insertions, 0 deletions