Make DLLs in deps available to wine TH runner

[hamishmack]

This is a better fix to the problem of making DLLs available to the process running in wine that is used to evaluate TH code when cross compiling for Windows.

[hamishmack]

bors try

[iohk-bors]

try

Build failed:

• buildkite/haskell-dot-nix

[hamishmack]

bors try

[hamishmack]

bors try-

[hamishmack]

bors try

[michaelpj]

Looks reasonable, just could do with some more comments!

[iohk-bors]

try

Timed out.

[hamishmack]

bors try

[iohk-bors]

try

Build succeeded:

• buildkite/haskell-dot-nix
• ci/hydra:Cardano:haskell-nix:required

[hamishmack]

bors try

[iohk-bors]

try

Build failed:

• ci/hydra:Cardano:haskell-nix:required

[hamishmack]

I've checked that this PR fixes #1402 and that it still works for IntersectMBO/plutus#4368.

[michaelpj]

Looks great, thanks!

[ramirez7]

Would this fix #1098? It sounds like it?

I've been using a bash script to use TH splices to work around this for over a year. So I'm very interested in fixing it. If you want, I can see if this PR fixes my issue?

EDIT: I tried it and I don't get any SDL.dll errors..but my build does seem to still hang entirely on the first invocation of TH. Not sure if it's related to this (or even a haskell.nix issue to begin with). I'll try to make a minimal repro in any case.

[michaelpj]

Would this fix #1098? It sounds like it?

Seems plausible! It's weird that it's hanging, though. From that issue, it sounds like you got the hang in the past also when you hacked it up to get the library to the right place. So it looks like we've again progressed to that point, and we are stuck with the mystery of the hanging.

[michaelpj]

bors try

[iohk-bors]

try

Timed out.

[hamishmack]

bors try

[iohk-bors]

try

Timed out.