Hi Gabriel,
Gabriel Giamarchi <gabri...@student.ethz.ch> writes:
> Installing only 'ghc 8.6.5' (Glasgow Haskell compiler) and sourcing
>
> '~/.guix-profile/etc/profile' leads to ghc not finding core modules.
> ('ghci' doesn't find System.IO for instance).
>
> This is due to $GHC_PACKAGE_PATH not containing ghc 8.6.5's
> package.conf.d, but
> instead ghc 8.4.3's database.
Ouch!
> Note: Not setting this variable leads to a working ghc (will search in
> default
> location), but is required to install additional packages via guix.
>
> The issue might come from guix/profiles.scm:812, since
> (module-ref (resolve-interface '(gnu packages haskell)) 'ghc)
> evaluates to <package ghc@8.4.3 gnu/packages/haskell.scm:445> in my repl.
Good catch. I can confirm this is the issue, but I’m not sure how to
fix it. We could try to find GHC from the profile rather than
unconditionally using a certain package. However, that would not help
if someone were to install GHC 8.4 and 8.6 in the same profile.
-- Tim
