Add support for building from source with preview features.

source/plugin/Assets/GoogleMobileAds/Api/MobileAds.cs

@@ -283,6 +283,18 @@ public static void OpenAdInspector(Action<AdInspectorError> adInspectorClosedAct
             });
         }
 
+        public static void HelloWorld()
+        {
+            Instance.client.HelloWorld();
+        }
+
+#if GMA_PREVIEW_FEATURES
+        public static void HelloWorldPreview()
+        {
+            Instance.client.HelloWorldPreview();
+        }
+#endif
+
         internal static IClientFactory GetClientFactory() {
           if (clientFactory == null) {
             String typeName = null;

source/plugin/Assets/GoogleMobileAds/Common/IMobileAdsClient.cs

@@ -77,5 +77,11 @@ void Preload(List<PreloadConfiguration> configurations,
         /// </summary>
         /// <param name="onAdInspectorClosed">Called when ad inspector UI closes.</param>
         void OpenAdInspector(Action<AdInspectorErrorClientEventArgs> adInspectorClosedAction);
+
+        void HelloWorld();
+
+#if GMA_PREVIEW_FEATURES
+        void HelloWorldPreview();
+#endif
     }
 }

source/plugin/Assets/GoogleMobileAds/Editor/BuildPostProcessor.cs

@@ -0,0 +1,41 @@
+using UnityEditor;
+using UnityEditor.Build;
+using UnityEditor.Build.Reporting;
+using UnityEditor.iOS.Xcode;
+
+namespace GoogleMobileAds.Editor
+{
+    public class BuildPostProcessor: IPostprocessBuildWithReport
+    {
+
+        public int callbackOrder { get { return 1; } }
+
+        public void OnPostprocessBuild(BuildReport report)
+        {
+            if (report.summary.platform != BuildTarget.iOS)
+            {
+                return;
+            }
+
+            string projectPath = PBXProject.GetPBXProjectPath(report.summary.outputPath);
+            var project = new PBXProject();
+            project.ReadFromFile(projectPath);
+            string unityFrameworkTargetGuid = project.GetUnityFrameworkTargetGuid(); 
+            string scriptingDefineSymbols = PlayerSettings.GetScriptingDefineSymbolsForGroup(
+                BuildTargetGroup.iOS);
+            bool isPreviewEnabled = scriptingDefineSymbols.Contains("GMA_PREVIEW_FEATURES");
+
+            if (isPreviewEnabled)
+            {
+                // This is equivalent to adding `-DGMA_PREVIEW_FEATURES=1` to the compiler flags.
+                project.AddBuildProperty(unityFrameworkTargetGuid,
+                    "GCC_PREPROCESSOR_DEFINITIONS",
+                    "GMA_PREVIEW_FEATURES=1");
+
+                UnityEngine.Debug.Log("GMA Preview Features enabled for iOS build.");
+            }
+
+            project.WriteToFile(projectPath);
+        }
+    }
+}

source/plugin/Assets/GoogleMobileAds/Platforms/Android/MobileAdsClient.cs

@@ -146,6 +146,18 @@ public Version GetSDKVersion()
             return new Version(versionString);
         }
 
+        public void HelloWorld()
+        {
+            Debug.Log("Hello from MobileAdsClient!");
+        }
+
+#if GMA_PREVIEW_FEATURES
+        public void HelloWorldPreview()
+        {
+            Debug.Log("Hello from MobileAdsClient Preview!");
+        }
+#endif
+
         #region Callbacks from OnInitializationCompleteListener.
 
         public void onInitializationComplete(AndroidJavaObject initStatus)

source/plugin/Assets/GoogleMobileAds/Platforms/Unity/MobileAdsClient.cs

@@ -219,5 +219,17 @@ public void DestroyAdInspector()
             AdBehaviour.DestroyAd(dummyAd);
             prefabAd = null;
         }
+
+        public void HelloWorld()
+        {
+            Debug.Log("Hello from MobileAdsClient!");
+        }
+
+#if GMA_PREVIEW_FEATURES
+        public void HelloWorldPreview()
+        {
+            Debug.Log("Hello from MobileAdsClient Preview!");
+        }
+#endif
     }
 }

source/plugin/Assets/GoogleMobileAds/Platforms/iOS/Externs.cs

@@ -966,6 +966,15 @@ internal static extern IntPtr GADUAdapterResponseInfoAdError(
         internal static extern string GADUAdapterResponseInfoDescription(IntPtr error);
 
         #endregion
+
+        [DllImport("__Internal")]
+        internal static extern void HelloWorld();
+
+#if GMA_PREVIEW_FEATURES
+        [DllImport("__Internal")]
+        internal static extern void HelloWorldPreview();
+#endif
+
     }
 }
 #endif

source/plugin/Assets/GoogleMobileAds/Platforms/iOS/MobileAdsClient.cs

@@ -145,6 +145,18 @@ public void OpenAdInspector(Action<AdInspectorErrorClientEventArgs> onAdInspecto
             Externs.GADUPresentAdInspector(this.mobileAdsClientPtr, AdInspectorClosedCallback);
         }
 
+        public void HelloWorld()
+        {
+            Externs.HelloWorld();
+        }
+
+#if GMA_PREVIEW_FEATURES
+        public void HelloWorldPreview()
+        {
+            Externs.HelloWorldPreview();
+        }
+#endif
+
         [MonoPInvokeCallback(typeof(GADUAdAvailableCallback))]
         private static void AdAvailableCallback(IntPtr mobileAdsClient, IntPtr config)
         {

source/plugin/Assets/Plugins/iOS/TestPlugin.h

@@ -0,0 +1,8 @@
+
+#import <Foundation/Foundation.h>
+
+@interface TestPlugin : NSObject
+
++ (void)HelloWorld;
+
+@end

source/plugin/Assets/Plugins/iOS/TestPlugin.m

@@ -0,0 +1,10 @@
+
+#import "TestPlugin.h"
+
+@implementation TestPlugin
+
++ (void)HelloWorld {
+    NSLog(@"Hello World from TestPlugin");
+}
+
+@end

source/plugin/Assets/Plugins/iOS/TestPlugin_Preview.h

@@ -0,0 +1,8 @@
+#import <Foundation/Foundation.h>
+#import "TestPlugin.h"
+
+@interface TestPlugin (Preview)
+
++ (void)HelloWorldPreview;
+
+@end

source/plugin/Assets/Plugins/iOS/TestPlugin_Preview.m

@@ -0,0 +1,11 @@
+#if GMA_PREVIEW_FEATURES
+#import "TestPlugin_Preview.h"
+
+@implementation TestPlugin (Preview)
+
++ (void)HelloWorldPreview {
+    NSLog(@"Hello World from TestPlugin_Preview");
+}
+
+@end
+#endif