flake.nixosConfigurations."naked-oci" = withSystem "aarch64-linux" (ctx@{ pkgs,config, inputs', ... }:
    inputs.nixpkgs.lib.nixosSystem {
      # Expose `packages`, `inputs` and `inputs'` as module arguments.
      # Use specialArgs permits use in `imports`.
      # Note: if you publish modules for reuse, do not rely on specialArgs, but
      # on the flake scope instead. See also https://flake.parts/define-module-in-separate-file.html
      specialArgs = {
        packages = config.packages;
        inherit inputs inputs';
        pkgs = pkgs.pkgsCross.aarch64-multiplatform;
      };
      modules = [
        # This module could be moved into a separate file; otherwise we might
        # as well have used ctx.config.packages directly.
        ({ config, lib, packages, pkgs, ... }: {
          imports = [
    inputs.disko.nixosModules.disko
  ];
nixpkgs.hostPlatform = "aarch64-linux";

...

tried like that error: a 'aarch64-linux' with features {} is required to build '/nix/store/8zwd7397wqs1dsw6j3v11jkfaivlspc3-aarch64-unknown-linux-gnu-binutils-wrapper-2.40.drv', but I am a 'x86_64-linux' with features {benchmark, big-parallel, kvm, nixos-test, uid-range}

moots: hrnz already said it, but specifically you should just be able to set these nixos options and that's all you need, keep the rest like a non-cross system

{
  nixpkgs.buildPlatform = "x86_64-linux";
  nixpkgs.hostPlatform = "aarch64-linux";
}

In reply to @2xsaiko:tchncs.de

moots: hrnz already said it, but specifically you should just be able to set these nixos options and that's all you need, keep the rest like a non-cross system

{
  nixpkgs.buildPlatform = "x86_64-linux";
  nixpkgs.hostPlatform = "aarch64-linux";
}

In reply to @ulli:hrnz.li
I use https://git.hrnz.li/Ulli/nixos/src/branch/main/hosts/flake-module.nix#L104 and it works like a charm

In reply to @ulli:hrnz.li
I use https://git.hrnz.li/Ulli/nixos/src/branch/main/hosts/flake-module.nix#L104 and it works like a charm

In reply to @2xsaiko:tchncs.de
and I assume "doesn't work" means it doesn't try to cross-compile with just those? that's weird

like
had it like
{ nixpkgs.buildPlatform = "x86_64-linux";
nixpkgs.hostPlatform = "aarch64-linux";

Oracle Cloud uses EFI boot

boot.loader.systemd-boot.enable = true;
boot.loader.efi.canTouchEfiVariables = true;

}

like
had it like

{
  nixpkgs.buildPlatform = "x86\_64-linux";
nixpkgs.hostPlatform = "aarch64-linux";

# Oracle Cloud uses EFI boot

boot.loader.systemd-boot.enable = true;
boot.loader.efi.canTouchEfiVariables = true;

}

not like

{  
  # Oracle Cloud uses EFI boot
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;
} {nixpkgs.buildPlatform = "x86_64-linux";
  nixpkgs.hostPlatform = "aarch64-linux";
}

error: builder for '/nix/store/cwjscarzmmrdhjbsqvwp21qxwnk2sr4q-aarch64-unknown-linux-gnueabihf-stage-static-gcc-12.2.0.drv' failed with exit code 2;
       last 10 log lines:
       > checking for O_CLOEXEC... yes
       > checking for AF_UNIX... yes
       > checking for AF_INET6... yes
       > checking for _LK_LOCK... no
       > checking if mkdir takes one argument... no
       > This target does not support --with-float.