Cross Compiling: Difference between revisions

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</syntaxhighlight>You can perform the same operations using the CLI, and Nix will correctly evaluate the <code>localSystem</code> based on your current system:<syntaxhighlight lang="bash">

nix-build '<nixpkgs>' -A pkgsCross.aarch64-multiplatform.hello # nix-legacy

nix-build '<nixpkgs>' --arg crossSystem '(import <nixpkgs> {}).lib.systems.examples.aarch64-multiplatform' -A hello # alternative way

nix build nixpkgs#pkgsCross.aarch64-multiplatform.hello # nix3

</syntaxhighlight>All of the above snippets will resolve to the exact same derivation result, which will provide a binary for GNU Hello that can execute only on an <code>aarch64</code> system. There are many other systems <code>pkgsCross</code> has defined, you can see an exhaustive list of all of them on your system:<syntaxhighlight lang="bash">

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}

) { }

</syntaxhighlight>

=== Using cross-compiled packages in the host NixOS config ===

First, configure your builder as a trusted [[Binary Cache|binary cache]].

Then copy the cross-compiled package to the host using <code>nix copy</code>.

Finally modify your <code>configuration.nix</code> as follows:

let pkgsCross = import <nixpkgs> {

localSystem = "x86_64-linux"; # <-- put your builder's platform here and below

hostSystem = "x86_64-linux";

crossSystem = "aarch64-linux"; # <-- put your host's platform here

};

in

{

environment.systemPackages = [

pkgsCross.hello # <-- put your cross-compiled package here

];

}

</syntaxhighlight>

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* [https://logs.nix.samueldr.com/nixos/2018-08-03#1533327247-1533327971; 2018-08-03 discussion on #nixos] ([https://matrix.to/#/!AinLFXQRxTuqNpXyXk:matrix.org/$15333274371713496LOAor:matrix.org Mirror of chat on Matrix.org])

* [https://nixcademy.com/posts/cpp-with-nix-in-2023-part-2-package/ C++ with Nix in 2023, Part 2: Package Generation and Cross-Compilation, Nixcademy]

* [https://nixcademy.com/posts/cross-compilation-with-nix/ Separation of Concerns in Cross-Compilation, Nixcademy]

* [https://nixcademy.com/posts/cross-compile-nixos-images/ Cross-Compiling NixOS images, Nixcademy]

[[Category:nix]]

[[Category:Development]]

@@ Line 20: / Line 20: @@
 </syntaxhighlight>You can perform the same operations using the CLI, and Nix will correctly evaluate the <code>localSystem</code> based on your current system:<syntaxhighlight lang="bash">
 nix-build '<nixpkgs>' -A pkgsCross.aarch64-multiplatform.hello # nix-legacy
+nix-build '<nixpkgs>' --arg crossSystem '(import <nixpkgs> {}).lib.systems.examples.aarch64-multiplatform' -A hello # alternative way
 nix build nixpkgs#pkgsCross.aarch64-multiplatform.hello # nix3
 </syntaxhighlight>All of the above snippets will resolve to the exact same derivation result, which will provide a binary for GNU Hello that can execute only on an <code>aarch64</code> system. There are many other systems <code>pkgsCross</code> has defined, you can see an exhaustive list of all of them on your system:<syntaxhighlight lang="bash">
@@ Line 159: / Line 160: @@
    }
 ) { }
+</syntaxhighlight>
+=== Using cross-compiled packages in the host NixOS config ===
+First, configure your builder as a trusted [[Binary Cache|binary cache]].
+Then copy the cross-compiled package to the host using <code>nix copy</code>.
+Finally modify your <code>configuration.nix</code> as follows:
+<syntaxhighlight lang="nix">
+let pkgsCross = import <nixpkgs> {
+  localSystem = "x86_64-linux"; # <-- put your builder's platform here and below
+  hostSystem = "x86_64-linux";
+  crossSystem = "aarch64-linux"; # <-- put your host's platform here
+};
+in
+{
+  environment.systemPackages = [
+    pkgsCross.hello # <-- put your cross-compiled package here
+  ];
+}
 </syntaxhighlight>
@@ Line 172: / Line 194: @@
 * [https://logs.nix.samueldr.com/nixos/2018-08-03#1533327247-1533327971; 2018-08-03 discussion on #nixos] ([https://matrix.to/#/!AinLFXQRxTuqNpXyXk:matrix.org/$15333274371713496LOAor:matrix.org Mirror of chat on Matrix.org])
+* [https://nixcademy.com/posts/cpp-with-nix-in-2023-part-2-package/ C++ with Nix in 2023, Part 2: Package Generation and Cross-Compilation, Nixcademy]
+* [https://nixcademy.com/posts/cross-compilation-with-nix/ Separation of Concerns in Cross-Compilation, Nixcademy]
+* [https://nixcademy.com/posts/cross-compile-nixos-images/ Cross-Compiling NixOS images, Nixcademy]
 [[Category:nix]]
 [[Category:Development]]