bug#55178: ghc cannot find libraries of ghc-comonad

[Lars-Dominik Braun]

Hi,

> > guix shell --pure ghc ghc-comonad gcc-toolchain -- ghc LinkMe.hs
> [1 of 1] Compiling Main             ( LinkMe.hs, LinkMe.o )
> Linking LinkMe ...
> ld: cannot find -lHScomonad-5.0.8-KDPzf2kORSz9Qeif8nQH6d
> ld: cannot find -lHStransformers-compat-0.6.6-9ADqfwGTALm8Nq2ZeUpa4p
> ld: cannot find -lHSindexed-traversable-0.1.1-Dfr00dUbJtB3rFEVdhtcE9
> ld: cannot find -lHSdistributive-0.6.2.1-L7rr3EplzD03NITUnJxmCO
> ld: cannot find -lHStagged-0.8.6.1-EiQY3za6Q5HE9cdvqupke2
> ld: cannot find -lHSbase-orphans-0.8.5-Iz1X6ZIULaHC76vf03czEu
> collect2: error: ld returned 1 exit status
> `gcc' failed in phase `Linker'. (Exit code: 1)
the problem here is that in Guix we link Haskell executables dynamically
and sometimes move static libraries to a separate output without updating
the config file (because otherwise it would create a reference, which
we’re trying to avoid to save space).

It works fine for me using

        guix shell --pure ghc ghc-comonad gcc-toolchain@10 -- ghc --make 
-dynamic -v LinkMe.hs

Cheers,
Lars