Initial commit

flake-multi-platform/README.md

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+# flake-multi-platform
+
+```
+> nix build
+...
+
+> nix flake show
+warning: Git tree '/home/mycroft/dev/nix-samples' is dirty
+git+file:///home/mycroft/dev/nix-samples?dir=flake-multi-platform
+└───packages
+    ├───aarch64-darwin
+    │   └───default omitted (use '--all-systems' to show)
+    ├───aarch64-linux
+    │   └───default omitted (use '--all-systems' to show)
+    ├───x86_64-darwin
+    │   └───default omitted (use '--all-systems' to show)
+    └───x86_64-linux
+        └───default: package 'simple'
+```

flake-multi-platform/flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1710631334,
+        "narHash": "sha256-rL5LSYd85kplL5othxK5lmAtjyMOBg390sGBTb3LRMM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c75037bbf9093a2acb617804ee46320d6d1fea5a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake-multi-platform/flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        # no need to define `system` anymore
+        name = "simple";
+        src = ./.;
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        # `eachDefaultSystem` transforms the input, our output set
+        # now simply has `packages.default` which gets turned into
+        # `packages.${system}.default` (for each system)
+        packages.default = derivation {
+          inherit system name src;
+          builder = with pkgs; "${bash}/bin/bash";
+          args = [ "-c" "echo foo > $out" ];
+        };
+      }
+    );
+}