I've pushed a second commit that wraps the compiler for cross-compilation, but at the moment I don't have access to the right hardware to test cross-compilation.

This adds nim-unwrapped and nim-stdlib to the top-level of nixpkgs, which can be overridden in overlays to affect the final nim wrapper.

For cross a test could be added that uses a qemu emulator. See e.g. https://github.com/NixOS/nixpkgs/blob/master/pkgs/test/cross/default.nix.

For cross a test could be added that uses a qemu emulator.

Unfortunately I only found two packages in the tree to cross-compile, one has a dependency that is broken for cross-compiles and the other is quite expensive to build. I've used this method to cross-compile Nim from Linux to Genode so I think it should work, and if it doesn't I'll fix it eventually.

Now Nimble gives me the dreaded Invalid section: . error:

     Error: Could not validate package:
        ... Could not read package info file in /home/repo/nimpkgs/geminim/geminim.nimble;
        ...   Reading as ini file failed with:
        ...     Invalid section: .
        ...   Evaluating as NimScript file failed with:
        ...     /home/repo/nimpkgs/geminim/geminim_20571.nims(5, 22) Warning: imported and not used: 'strutils' [UnusedImport]
        ... printPkgInfo() failed.