[FR] - Make `cardano-api/gen` a normal library again due to haskell.nix incompatibility.

[MangoIV]

Internal/External
External When trying to depend on the cardano-node/cardano-api/gen lib, the ghcWrapper somehow doesn't include the lib in the shell environment. This makes it not really usable as a dependency.

Area
Other Any other topic (Delegation, Ranking, ...).

Describe the feature you'd like
I would like the gen library to be a normal toplevel library as long as all the bugs with sublibs aren't fixed.

Describe alternatives you've considered
The alternative is fixing haskell.nix and/or cabal

Additional context / screenshots
Also see this issue on haskell.nix

[github-actions]

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[newhoggy]

It's not possible to make library cardano-api:gen a separate package because test-suite cardano-api:cardano-api-test depends on library cardano-api:gen which in turn depends on library cardano-api.

test-suite cardano-api:cardano-api-test and library cardano-api are defined in the same package cardano-api, so cabal requires that the gen package exist in the same package as well.

Unfortunately, this means fixing haskell.nix and/or cabal is the only viable option.

[eyeinsky]

Unfortunately, this means fixing haskell.nix and/or cabal is the only viable option.

Improving haskell.nix seems like a good thing!

[newhoggy]

@MangoIV , @eyeinsky I'm interested to know if this resolves the issue: #4970

[MangoIV]

Afaict yes.

[newhoggy]

Can you point to where the library is used? Is it for consumption via an srp entry in a cabal.project or something else?

[MangoIV]

I tried it with both srp and nix extra hackage. Neither do worth. Sublibs just don't work. At least for Haskell.nix devShells. See the attached issue. Thank you.