cabalPkgConfigWrapper is broken for cross-compilation

[ramirez7]

mingwW64 in my case.

This is caused by #1641 (@hamishmack)

---

https://gitlab.com/macaroni.dev/macaroni.nix/-/merge_requests/12

^ You can try the sdl2-minimal example in this branch. make windows will do x-compilation. The Linux build (make build) works fine.

It will fail to resolve the sdl2 pkgconfig-depends despite that library being mapped in haskell.nix itself explicitly. This points to something being off in haskell.nix.

Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: sdl2-minimal-0.1.0.0 (user goal)
[__1] trying: sdl2-2.5.3.3 (dependency of sdl2-minimal)
[__2] rejecting: sdl2:+recent-ish (conflict: pkg-config package sdl2>=2.0.10,
not found in the pkg-config database)
[__2] rejecting: sdl2:-recent-ish (conflict: pkg-config package sdl2>=2.0.6,
not found in the pkg-config database)
[__2] fail (backjumping, conflict set: sdl2, sdl2:recent-ish)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: sdl2, sdl2:recent-ish, sdl2-minimal

Error: cabal: Could not resolve dependencies:
trace: ERROR: cabal configure failed with:
Warning: The package list for 'hackage.haskell.org-at-2022-09-12T000000Z' is
19248 days old.
Run 'cabal update' to get the latest list of available packages.
Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: sdl2-minimal-0.1.0.0 (user goal)
[__1] trying: sdl2-2.5.3.3 (dependency of sdl2-minimal)
[__2] rejecting: sdl2:+recent-ish (conflict: pkg-config package sdl2>=2.0.10,
not found in the pkg-config database)
[__2] rejecting: sdl2:-recent-ish (conflict: pkg-config package sdl2>=2.0.6,
not found in the pkg-config database)
[__2] fail (backjumping, conflict set: sdl2, sdl2:recent-ish)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: sdl2, sdl2:recent-ish, sdl2-minimal

[ramirez7]

fwiw, setting evalPackages = pkgs in my cabalProject call fixes this. Here's an example.

Not sure if there are any side-effects to that I should know about, but things are working e2e cross-compiling to mingwW64.

[stale]

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