Add the MLX backend product to the SwiftPM package template

Package.swift.template

@@ -46,6 +46,15 @@ let products = deliverables([
  "sqlite3",
  ],
  ],
+ "backend_mlx": [
+ "sha256": "__SHA256_backend_mlx__",
+ "sha256" + debug_suffix: "__SHA256_backend_mlx_debug__",
+ "frameworks": [
+ "Metal",
+ "Foundation",
+ "QuartzCore",
+ ],
+ ],
  "backend_xnnpack": [
  "sha256": "__SHA256_backend_xnnpack__",
  "sha256" + debug_suffix: "__SHA256_backend_xnnpack_debug__",
@@ -134,11 +143,43 @@ for (key, value) in products {
  packageTargets.append(target)
 }
 
+// The MLX Metal kernel libraries, one per platform slice, shipped as a single
+// resource bundle both MLX products share. Kept out of the generic loop above so
+// there is one bundle (executorch_backend_mlx_resources.bundle) rather than a
+// separate debug copy, and so the release and debug delegates resolve the same
+// name. Each slice's MLX binary asks for its own mlx-<slice>.metallib.
+//
+// The release job commits all three files to this branch before publishing, so
+// they are declared unconditionally: a slice that failed to arrive is then
+// reported as "Invalid Resource ... File not found" at resolve time, rather than
+// silently producing a bundle with no kernels that the delegate would only fault
+// on at Metal device init inside a consumer's app.
+// Do not gate these on FileManager.fileExists: a relative path is resolved
+// against the process working directory, and when this package is a dependency
+// that is the consumer's root, so every slice would appear missing and the
+// bundle would ship empty.
+let mlxMetallibSlices = ["mlx-ios", "mlx-ios-simulator", "mlx-macos"]
+let mlxResourcesDir = ".Package.swift/backend_mlx_resources"
+if products.keys.contains("backend_mlx") {
+ packageTargets.append(.target(
+ name: "backend_mlx_resources",
+ path: mlxResourcesDir,
+ resources: mlxMetallibSlices.map { .copy("\($0).metallib") }
+ ))
+ for suffix in ["", debug_suffix] {
+ if let index = packageTargets.firstIndex(where: {
+ $0.name == "backend_mlx\(suffix)\(dependencies_suffix)"
+ }) {
+ packageTargets[index].dependencies.append(.target(name: "backend_mlx_resources"))
+ }
+ }
+}
+
 let package = Package(
  name: "executorch",
  platforms: [
  .iOS(.v17),
- .macOS(.v12),
+ .macOS(.v14),
  ],
  products: packageProducts,
  targets: packageTargets