23 lines
795 B
Nix
23 lines
795 B
Nix
{ config, ... }:
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let
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mkCrossFrom = localSystem: pkgs: import pkgs.path {
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inherit localSystem;
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crossSystem = pkgs.stdenv.hostPlatform.system;
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inherit (config.nixpkgs) config overlays;
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};
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in
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{
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# the configuration of which specific package set `pkgs.cross` refers to happens elsewhere;
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# here we just define them all.
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nixpkgs.overlays = [
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(next: prev: {
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# non-emulated packages build *from* local *for* target.
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# for large packages like the linux kernel which are expensive to build under emulation,
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# the config can explicitly pull such packages from `pkgs.cross` to do more efficient cross-compilation.
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crossFrom."x86_64-linux" = mkCrossFrom "x86_64-linux" next;
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crossFrom."aarch64-linux" = mkCrossFrom "aarch64-linux" next;
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})
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];
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}
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