cross compile support

[blaggacao]

Is your feature request related to a problem? Please describe.
On my attempt to cross-compile for a RaspberryPi host, I got frustrated with a refusal to cross compile.

(I'm a layman, more than others who claim it, but) I believe, the reason is that nixflk currently doesn't hanle the crossSytem attribute, which I reference from my own context and ongoing line of thought here and here.

Describe the solution you'd like
Not sure how to sort this out short vs long term. A consolidated numtide/flake-utils backed solution would be ideal. (see the linked passages).

Describe alternatives you've considered
Too little a knowledge to be serious on alternatives.

Additional context

I'm trying to get some PI-based "home-automation" going.

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[nrdxp]

Is this a duplicate of #72? Cross compiling packages already works by pulling from pkgsCross as usual, so at the very least, the title may need revision.

I am also able to build for aarch by adding:

{
  boot.binfmt.emulatedSystems = [ "aarch64-linux" ];
}

So I'm not sure if this may solve the issue, at least for building aarch packages on x86.

[blaggacao]

Is this a duplicate of #72?

Indeed! Or at least subsumable thereunder. Thanks for pointing this out.