Add Windows Cross Compilers

[hamishmack]

I don't think our Darwin -> Windows cross toolchain works.

It has in the past. I think current mix of wine/mingw/ghc 9.6/darwin/nixpkgs is broken though.

[angerman]

I don't think our Darwin -> Windows cross toolchain works.

It has in the past. I think current mix of wine/mingw/ghc 9.6/darwin/nixpkgs is broken though.

I believe it's been broken, or flake for quite some time :( So for now I'd just ignore it.

[angerman]

So I've added a bunch of changes:

• turned the build/run into a reusable workflow, this allows us to get around the annoying double matrix.
• fixed the windows-latest (leading space); GH runners are awesome in not showing you the leading space, and just waiting forever for a runner to show up with a leading space 🤦
• Added an inspect phase. This shows us for dynamic linux:

  /nix/store/c35hf8g5b9vksadym9dbjrd6p2y11m8h-glibc-2.35-224/lib/ld-linux-x86-64.so.2
  libgmp.so.10
  libc.so.6
  libm.so.6
  librt.so.1
  libdl.so.2
  libffi.so.8
  libnuma.so.1

  So this will likely never work. We can use patchelf to change the interpreter to /lib/ld-linux.so.2 for unbuntu

  patchelf --set-interpreter /lib/ld-linux.so.2 bin/test

  we'd also need to copy all the dynamic libraries alongside and package them as well. (or maybe we can remove them; not sure if they are really used?)

• [!] we need to embed a git hash into the devx shell. Currently it's impossible to tell from which revision the specific shell was built.

[angerman]

I've extracted most of the cleanup into #49

[angerman]

somehow the changed base did not work properly.

[angerman]

git diff shows the proper output, GitHub seems screwed somehow.

[angerman]

Ahh force push seems to have gotten the confusion away

[angerman]

[!] we need to embed a git hash into the devx shell. Currently it's impossible to tell from which revision the specific shell was built.

I've implemented this one now in main.

[angerman]

Current status:

• windows failures: because we need to regenerate the devx containers, once hydra is done.
• linux failures: dynamic libraries are missing (need to find, and copy the .so's along). I did set the interpreter, hence the error messages are more meaningful now.

[angerman]

After discussing this with @hamishmack; we may come back to this for Darwin -> Windows, once that works again in haskell.nix.