fix: accessing Availability.h macros in Swift (Xcode 26 support) (#4013)

* Create AmplifyAvailability shim for Availability.h imports

* Update ASFAppInfo to use AmplifyAvailability

* Use traditional target instead of systemLibrary with better support for Xcode 15

Author: liamnichols

AmplifyPlugins/Auth/Sources/AWSCognitoAuthPlugin/ASF/ASFAppInfo.swift

@@ -5,6 +5,7 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+import AmplifyAvailability
 import Foundation
 
 struct ASFAppInfo: ASFAppInfoBehavior {
@@ -16,9 +17,9 @@ struct ASFAppInfo: ASFAppInfoBehavior {
     var targetSDK: String {
         var targetSDK: String = ""
 #if os(iOS) || os(watchOS) || os(tvOS)
-        targetSDK = "\(__IPHONE_OS_VERSION_MIN_REQUIRED)"
+        targetSDK = "\(getIOSVersionMinRequired())"
 #elseif os(macOS)
-        targetSDK = "\(__MAC_OS_X_VERSION_MIN_REQUIRED)"
+        targetSDK = "\(getMACOSXVersionMinRequired())"
 #else
         targetSDK = "Unknown"
 #endif

AmplifyPlugins/Auth/Sources/AmplifyAvailability/AmplityAvailability.c

@@ -0,0 +1,21 @@
+//
+// Copyright Amazon.com Inc. or its affiliates.
+// All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+#include "include/AmplifyAvailability.h"
+#include <Availability.h>
+
+#if TARGET_OS_IOS || TARGET_OS_WATCH || TARGET_OS_TV
+int getIOSVersionMinRequired(void) {
+    return __IPHONE_OS_VERSION_MIN_REQUIRED;
+}
+#endif
+
+#if TARGET_OS_OSX
+int getMACOSXVersionMinRequired(void) {
+    return __MAC_OS_X_VERSION_MIN_REQUIRED;
+}
+#endif

AmplifyPlugins/Auth/Sources/AmplifyAvailability/include/AmplifyAvailability.h

@@ -0,0 +1,21 @@
+//
+// Copyright Amazon.com Inc. or its affiliates.
+// All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+#ifndef AmplifyAvailability_h
+#define AmplifyAvailability_h
+
+#include <TargetConditionals.h>
+
+#if TARGET_OS_IOS || TARGET_OS_WATCH || TARGET_OS_TV
+int getIOSVersionMinRequired(void);
+#endif
+
+#if TARGET_OS_OSX
+int getMACOSXVersionMinRequired(void);
+#endif
+
+#endif /* AmplifyAvailability_h */

AmplifyPlugins/Auth/Sources/AmplifyAvailability/module.modulemap

@@ -0,0 +1,4 @@
+module AmplifyAvailability {
+    header "include/AmplifyAvailability.h"
+    export *
+}

Package.swift

@@ -179,6 +179,7 @@ let authTargets: [Target] = [
         name: "AWSCognitoAuthPlugin",
         dependencies: [
             .target(name: "Amplify"),
+            .target(name: "AmplifyAvailability"),
             .target(name: "AmplifySRP"),
             .target(name: "AWSPluginsCore"),
             .target(name: "InternalAmplifyCredentials"),
@@ -191,6 +192,11 @@ let authTargets: [Target] = [
             .copy("Resources/PrivacyInfo.xcprivacy")
         ]
     ),
+    .target(
+        name: "AmplifyAvailability",
+        path: "AmplifyPlugins/Auth/Sources/AmplifyAvailability",
+        publicHeadersPath: "include"
+    ),
     .target(
         name: "libtommathAmplify",
         path: "AmplifyPlugins/Auth/Sources/libtommath",