Adapt for ghc-bignum

By using @bgamari's ghc-artefact-nix fork for the moment.

I'm not entirely sure what using a fork of ghc-artefact-nix is supposed to accomplish here?

FWIW, I'm also running into ghc-bignum–related troubles in !99 (merged) (see https://gitlab.haskell.org/RyanGlScott/head.hackage/-/jobs/387249). Perhaps we should join forces there.

ghc-artefact-nix needs to be adapted to patch the ghc-bignum library. See https://github.com/bgamari/ghc-artefact-nix/commit/58552c112d1bdf8c86bfa291e7f0abec34ddef4f. If you cherry-pick this patch into your branch I suspect that should resolve your issues.

Curiously, I haven't ran into any issues with ghc-artefact-nix itself. The troubles that I allude to in !100 (comment 286468) are more that libraries like cryptonite and integer-gmp no longer build due to ghc-bignum no longer defining libgmp-specific primitives.

@RyanGlScott indeed, I believe that is because my ghc-artefact-nix branch has been merged upstream and CI pulls from master. Consequently, I believe this MR can be closed.

closed