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

[Christoph Schumacher]

I found several bugs with the ghc and ghc-comonad packages:

- ghc needs gcc-toolchain in order to work.  This has already been 
reported:
  https://issues.guix.gnu.org/32131 and 
https://issues.guix.gnu.org/34850
- In the store, ghc-libraries seem to have the version appended to their 
name.
  The linker does not know this and cannot find the libraries.
- I created soft links with the names ghc expects in the current working 
directory
  and extended LIBRARY_PATH to include the current working directory.
  Then linking succeeds.
- But the executable again fails to find the libraries.
  It knows about the appended version strings, but it cannot find the 
files anyway.
  So I created more soft links, and now the simple test program runs.
- But as soon as I try to use a Comonad, the executable crashes.

Here is a minimal example:

> ls
LinkMe.hs
Main.hs

> cat LinkMe.hs
import Control.Comonad
main = putStrLn "Congratulations!"

> guix shell --pure ghc ghc-comonad -- ghc LinkMe.hs
[1 of 1] Compiling Main             ( LinkMe.hs, LinkMe.o )

<no location info>: error:
    Warning: Couldn't figure out C compiler information!
             Make sure you're using GNU gcc, or clang
ghc: could not execute: gcc

> 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)

> ln -s 
> /gnu/store/7xfvafaxbpc88bjmvijg38pr8djjx465-ghc-base-orphans-0.8.5/lib/x86_64-linux-ghc-8.10.7/libHSbase-orphans-0.8.5-Iz1X6ZIULaHC76vf03czEu-ghc8.10.7.so 
> libHSbase-orphans-0.8.5-Iz1X6ZIULaHC76vf03czEu.so
> ln -s 
> /gnu/store/rjkyixykafdhbf67aa3zlhappxl1dgai-ghc-comonad-5.0.8/lib/x86_64-linux-ghc-8.10.7/libHScomonad-5.0.8-KDPzf2kORSz9Qeif8nQH6d-ghc8.10.7.so 
> libHScomonad-5.0.8-KDPzf2kORSz9Qeif8nQH6d.so
> ln -s 
> /gnu/store/4jfs13lg5g93ssbfdr4hqqadw2iadir7-profile/lib/x86_64-linux-ghc-8.10.7/libHSdistributive-0.6.2.1-L7rr3EplzD03NITUnJxmCO-ghc8.10.7.so 
> libHSdistributive-0.6.2.1-L7rr3EplzD03NITUnJxmCO.so
> ln -s 
> /gnu/store/4jfs13lg5g93ssbfdr4hqqadw2iadir7-profile/lib/x86_64-linux-ghc-8.10.7/libHSindexed-traversable-0.1.1-Dfr00dUbJtB3rFEVdhtcE9-ghc8.10.7.so 
> libHSindexed-traversable-0.1.1-Dfr00dUbJtB3rFEVdhtcE9.so
> ln -s 
> /gnu/store/4jfs13lg5g93ssbfdr4hqqadw2iadir7-profile/lib/x86_64-linux-ghc-8.10.7/libHStagged-0.8.6.1-EiQY3za6Q5HE9cdvqupke2-ghc8.10.7.so 
> libHStagged-0.8.6.1-EiQY3za6Q5HE9cdvqupke2.so
> ln -s 
> /gnu/store/4jfs13lg5g93ssbfdr4hqqadw2iadir7-profile/lib/x86_64-linux-ghc-8.10.7/libHStransformers-compat-0.6.6-9ADqfwGTALm8Nq2ZeUpa4p-ghc8.10.7.so 
> libHStransformers-compat-0.6.6-9ADqfwGTALm8Nq2ZeUpa4p.so

> guix shell --pure ghc ghc-comonad gcc-toolchain coreutils -- env 
> LIBRARY_PATH=$LIBRARY_PATH:. ghc LinkMe.hs
Linking LinkMe ...

> ./LinkMe
./LinkMe: error while loading shared libraries: 
libHScomonad-5.0.8-KDPzf2kORSz9Qeif8nQH6d-ghc8.10.7.so: cannot open 
shared object file: No such file or directory

> ln -s 
> /gnu/store/rjkyixykafdhbf67aa3zlhappxl1dgai-ghc-comonad-5.0.8/lib/x86_64-linux-ghc-8.10.7/libHScomonad-5.0.8-KDPzf2kORSz9Qeif8nQH6d-ghc8.10.7.so 
> ./

> ./LinkMe
./LinkMe: error while loading shared libraries: 
libHStransformers-compat-0.6.6-9ADqfwGTALm8Nq2ZeUpa4p-ghc8.10.7.so: 
cannot open shared object file: No such file or directory

> ln -s 
> /gnu/store/4jfs13lg5g93ssbfdr4hqqadw2iadir7-profile/lib/x86_64-linux-ghc-8.10.7/libHStransformers-compat-0.6.6-9ADqfwGTALm8Nq2ZeUpa4p-ghc8.10.7.so 
> ./

> ./LinkMe
./LinkMe: error while loading shared libraries: 
libHSindexed-traversable-0.1.1-Dfr00dUbJtB3rFEVdhtcE9-ghc8.10.7.so: 
cannot open shared object file: No such file or directory

> ln -s 
> /gnu/store/4jfs13lg5g93ssbfdr4hqqadw2iadir7-profile/lib/x86_64-linux-ghc-8.10.7/libHSindexed-traversable-0.1.1-Dfr00dUbJtB3rFEVdhtcE9-ghc8.10.7.so 
> ./

 ./LinkMe
./LinkMe: error while loading shared libraries: 
libHSdistributive-0.6.2.1-L7rr3EplzD03NITUnJxmCO-ghc8.10.7.so: cannot 
open shared object file: No such file or directory

> ln -s 
> /gnu/store/4jfs13lg5g93ssbfdr4hqqadw2iadir7-profile/lib/x86_64-linux-ghc-8.10.7/libHSdistributive-0.6.2.1-L7rr3EplzD03NITUnJxmCO-ghc8.10.7.so 
> ./

> ./LinkMe
./LinkMe: error while loading shared libraries: 
libHStagged-0.8.6.1-EiQY3za6Q5HE9cdvqupke2-ghc8.10.7.so: cannot open 
shared object file: No such file or directory

> ln -s 
> /gnu/store/4jfs13lg5g93ssbfdr4hqqadw2iadir7-profile/lib/x86_64-linux-ghc-8.10.7/libHStagged-0.8.6.1-EiQY3za6Q5HE9cdvqupke2-ghc8.10.7.so 
> ./

> ./LinkMe
./LinkMe: error while loading shared libraries: 
libHSbase-orphans-0.8.5-Iz1X6ZIULaHC76vf03czEu-ghc8.10.7.so: cannot open 
shared object file: No such file or directory

> ln -s 
> /gnu/store/7xfvafaxbpc88bjmvijg38pr8djjx465-ghc-base-orphans-0.8.5/lib/x86_64-linux-ghc-8.10.7/libHSbase-orphans-0.8.5-Iz1X6ZIULaHC76vf03czEu-ghc8.10.7.so 
> ./

> ./LinkMe
Congratulations!

> cat Main.hs
{-# LANGUAGE DeriveFunctor #-}

import Control.Comonad (Comonad(..), extend)

data C a = C a deriving (Show, Functor)

instance Comonad C where
  extract (C a) = a
  duplicate x = C x

main :: IO ()
main = print $ extend id (C 0)

> guix shell --pure ghc ghc-comonad gcc-toolchain coreutils -- env 
> LIBRARY_PATH=$LIBRARY_PATH:. ghc Main.hs
[1 of 1] Compiling Main             ( Main.hs, Main.o )
Linking Main ...

> guix shell --pure ghc ghc-comonad gcc-toolchain coreutils -- env 
> LIBRARY_PATH=$LIBRARY_PATH:. ./Main
Main: internal error: stg_ap_p_ret
    (GHC version 8.10.7 for x86_64_unknown_linux)
    Please report this as a GHC bug:  
https://www.haskell.org/ghc/reportabug