feat: add crate swift-rs

swift-rs/src-rs/test-build.rs

@@ -0,0 +1,20 @@
+//! Build script for swift-rs that is a no-op for normal builds, but can be enabled
+//! to include test swift library based on env var `TEST_SWIFT_RS=true` with the
+//! `build` feature being enabled.
+
+#[cfg(feature = "build")]
+mod build;
+
+fn main() {
+    println!("cargo:rerun-if-env-changed=TEST_SWIFT_RS");
+
+    #[cfg(feature = "build")]
+    if std::env::var("TEST_SWIFT_RS").unwrap_or_else(|_| "false".into()) == "true" {
+        use build::SwiftLinker;
+
+        SwiftLinker::new("10.15")
+            .with_ios("11")
+            .with_package("test-swift", "tests/swift-pkg")
+            .link();
+    }
+}