first

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "azookey-binding"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "azookey-binding"
+version = "0.1.0"
+edition = "2024"
+

azookey-swift/.gitignore

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+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

azookey-swift/Package.swift

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+// swift-tools-version: 6.1
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "azookey-swift",
+    products: [
+        // Products define the executables and libraries a package produces, making them visible to other packages.
+        .library(
+            name: "azookey-swift",
+            type: .dynamic,
+            targets: ["azookey-swift"]),
+        .library(
+            name: "ffi",
+            targets: ["azookey-swift"]
+        )
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .target(name: "ffi"),
+        .target(
+            name: "azookey-swift",
+            dependencies: [
+                "ffi"
+            ]
+        ),
+        .testTarget(
+            name: "azookey-swiftTests",
+            dependencies: ["azookey-swift"]
+        ),
+    ]
+)

azookey-swift/Sources/azookey-swift/azookey_swift.swift

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+import Foundation
+import ffi
+
+@_silgen_name("HelloSwift")
+@MainActor public func hello_swift() {
+    print("hello_swift")
+}

azookey-swift/Sources/ffi/include/ffi.h

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+#ifndef ffi_h
+#define ffi_h
+
+#include <stdio.h>
+
+#endif
+

azookey-swift/Sources/ffi/module.modulemap

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+module ffi {
+  header "ffi.h"
+
+  export *
+}

azookey-swift/Tests/azookey-swiftTests/azookey_swiftTests.swift

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+import Testing
+@testable import azookey_swift
+
+@Test func example() async throws {
+    // Write your test here and use APIs like `#expect(...)` to check expected conditions.
+}

build.rs

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+fn main() {
+    let project_dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
+    println!(
+        "cargo:rustc-link-search={}/azookey-swift/.build/release/",
+        project_dir
+    );
+    println!("cargo:rustc-link-lib=azookey-swift");
+}

src/lib.rs

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+unsafe extern "C" {
+    pub fn HelloSwift();
+}

src/main.rs

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+fn main() {
+    unsafe { azookey_binding::HelloSwift() };
+}