Link statically

flake.nix

@@ -8,75 +8,135 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
-  outputs = {
-    nixpkgs,
-    crane,
-    rust-overlay,
-    nix-filter,
-    ...
-  }: let
-    supportedSystems = [
-      "x86_64-linux"
-      "x86_64-darwin"
-      "aarch64-linux"
-      "aarch64-darwin"
-    ];
-    overlays = [(import rust-overlay)];
-    filter = import nix-filter;
-    eachSystem = nixpkgs.lib.genAttrs supportedSystems;
+  outputs =
+    {
+      nixpkgs,
+      crane,
+      rust-overlay,
+      nix-filter,
+      ...
+    }:
+    let
+      supportedSystems = [
+        "x86_64-linux"
+        "x86_64-darwin"
+        "aarch64-linux"
+        "aarch64-darwin"
+      ];
+      overlays = [ (import rust-overlay) ];
+      filter = import nix-filter;
+      eachSystem = nixpkgs.lib.genAttrs supportedSystems;
 
-    toolchainFor = pkgs:
-      pkgs.rust-bin.nightly.latest.minimal.override {
-        extensions = ["clippy" "rust-src"];
-      };
-  in {
-    packages = eachSystem (system: let
-      pkgs = import nixpkgs {inherit system overlays;};
-      craneLib = (crane.mkLib pkgs).overrideToolchain (toolchainFor pkgs);
-      src = filter {
-        root = ./.;
-        include = [
-          "src"
-          "Cargo.toml"
-          "Cargo.lock"
-        ];
-      };
-      craneArgs = {
-        inherit src;
-        strictDeps = true;
-        SSL_CERT_FILE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
-      } // pkgs.lib.optionalAttrs pkgs.stdenv.hostPlatform.isDarwin {
-        RUSTFLAGS = "-C link-arg=-Wl,-dead_strip_dylibs";
-      };
-      cargoArtifacts = craneLib.buildDepsOnly craneArgs;
-    in {
-      default = craneLib.buildPackage (craneArgs
-        // {
-          inherit cargoArtifacts;
-          pname = "brainpod-cli";
-          version = "0.1.0";
-          meta.mainProgram = "brainpod";
+      rustTargetFor =
+        system:
+        {
+          x86_64-linux = "x86_64-unknown-linux-musl";
+          aarch64-linux = "aarch64-unknown-linux-musl";
         }
-        // pkgs.lib.optionalAttrs pkgs.stdenv.hostPlatform.isDarwin {
-          postFixup = ''
-            if otool -L "$out/bin/brainpod" | tail -n +2 | grep -F /nix/store/; then
-              echo "brainpod contains a dynamic Nix store dependency" >&2
-              exit 1
-            fi
-          '';
-        });
-    });
+        .${system} or null;
 
-    devShells = eachSystem (system: let
-      pkgs = import nixpkgs {inherit system overlays;};
-      craneLib = (crane.mkLib pkgs).overrideToolchain (toolchainFor pkgs);
-    in {
-      default = craneLib.devShell {
-        packages = with pkgs; [
-          rustfmt
-          rust-analyzer
-        ];
-      };
-    });
-  };
+      toolchainFor =
+        pkgs:
+        let
+          rustTarget = rustTargetFor pkgs.stdenv.hostPlatform.system;
+        in
+        pkgs.rust-bin.nightly.latest.minimal.override (
+          {
+            extensions = [
+              "clippy"
+              "rust-src"
+            ];
+          }
+          // pkgs.lib.optionalAttrs (rustTarget != null) {
+            targets = [ rustTarget ];
+          }
+        );
+    in
+    {
+      packages = eachSystem (
+        system:
+        let
+          rustTarget = rustTargetFor system;
+          pkgs = import nixpkgs (
+            {
+              localSystem = system;
+              inherit overlays;
+            }
+            // nixpkgs.lib.optionalAttrs (rustTarget != null) {
+              crossSystem.config = rustTarget;
+            }
+          );
+          craneLib = (crane.mkLib pkgs).overrideToolchain toolchainFor;
+          src = filter {
+            root = ./.;
+            include = [
+              "src"
+              "Cargo.toml"
+              "Cargo.lock"
+            ];
+          };
+          craneArgs = {
+            inherit src;
+            strictDeps = true;
+            SSL_CERT_FILE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
+          }
+          // pkgs.lib.optionalAttrs pkgs.stdenv.hostPlatform.isLinux {
+            CARGO_BUILD_TARGET = rustTarget;
+            CARGO_BUILD_RUSTFLAGS = "-C target-feature=+crt-static";
+          }
+          // pkgs.lib.optionalAttrs pkgs.stdenv.hostPlatform.isDarwin {
+            RUSTFLAGS = "-C link-arg=-Wl,-dead_strip_dylibs";
+          };
+          cargoArtifacts = craneLib.buildDepsOnly craneArgs;
+        in
+        {
+          default = craneLib.buildPackage (
+            craneArgs
+            // {
+              inherit cargoArtifacts;
+              pname = "brainpod-cli";
+              version = "0.1.0";
+              meta.mainProgram = "brainpod";
+            }
+            // pkgs.lib.optionalAttrs pkgs.stdenv.hostPlatform.isLinux {
+              nativeBuildInputs = [ pkgs.buildPackages.binutils ];
+              postFixup = ''
+                if readelf -l "$out/bin/brainpod" | grep -F INTERP; then
+                  echo "brainpod contains a dynamic ELF interpreter" >&2
+                  exit 1
+                fi
+                if readelf -d "$out/bin/brainpod" | grep -F '(NEEDED)'; then
+                  echo "brainpod contains a dynamic library dependency" >&2
+                  exit 1
+                fi
+              '';
+            }
+            // pkgs.lib.optionalAttrs pkgs.stdenv.hostPlatform.isDarwin {
+              postFixup = ''
+                if otool -L "$out/bin/brainpod" | tail -n +2 | grep -F /nix/store/; then
+                  echo "brainpod contains a dynamic Nix store dependency" >&2
+                  exit 1
+                fi
+              '';
+            }
+          );
+        }
+      );
+
+      devShells = eachSystem (
+        system:
+        let
+          pkgs = import nixpkgs { inherit system overlays; };
+          craneLib = (crane.mkLib pkgs).overrideToolchain toolchainFor;
+        in
+        {
+          default = craneLib.devShell {
+            packages = with pkgs; [
+              rustfmt
+              rust-analyzer
+            ];
+          };
+        }
+      );
+    };
 }