If the jucer file does not specify a macOS/iOS deployment target then default to the latest known working version

extras/Projucer/Source/Project Saving/jucer_ProjectExport_XCode.h

@@ -29,7 +29,7 @@ namespace
 {
     const char* const osxVersionDefault         = "default";
     const int oldestSDKVersion  = 5;
-    const int currentSDKVersion = 11;
+    const int currentSDKVersion = 12;
 
     const char* const osxArch_Default           = "default";
     const char* const osxArch_Native            = "Native";
@@ -374,8 +374,8 @@ protected:
 
             if (iOS)
             {
-                const char* iosVersions[]      = { "Use Default",     "7.0", "7.1", "8.0", "8.1", "8.2", "8.3", "8.4", "9.0", "9.1", "9.2", "9.3", 0 };
-                const char* iosVersionValues[] = { osxVersionDefault, "7.0", "7.1", "8.0", "8.1", "8.2", "8.3", "8.4", "9.0", "9.1", "9.2", "9.3", 0 };
+                const char* iosVersions[]      = { "Use Default",     "7.0", "7.1", "8.0", "8.1", "8.2", "8.3", "8.4", "9.0", "9.1", "9.2", "9.3", "10.0", 0 };
+                const char* iosVersionValues[] = { osxVersionDefault, "7.0", "7.1", "8.0", "8.1", "8.2", "8.3", "8.4", "9.0", "9.1", "9.2", "9.3", "10.0", 0 };
 
                 props.add (new ChoicePropertyComponent (iosDeploymentTarget.getPropertyAsValue(), "iOS Deployment Target",
                                                         StringArray (iosVersions), Array<var> (iosVersionValues)),
@@ -957,12 +957,17 @@ public:
                 const String sdk (config.osxSDKVersion.get());
                 const String sdkCompat (config.osxDeploymentTarget.get());
 
+                // if the user doesn't set it, then use the last known version that works well with JUCE
+                String deploymentTarget = "10.11";
+
                 for (int ver = oldestSDKVersion; ver <= currentSDKVersion; ++ver)
                 {
                     if (sdk == getSDKName (ver))         s.add ("SDKROOT = macosx10." + String (ver));
-                    if (sdkCompat == getSDKName (ver))   s.add ("MACOSX_DEPLOYMENT_TARGET = 10." + String (ver));
+                    if (sdkCompat == getSDKName (ver))   deploymentTarget = "10." + String (ver);
                 }
 
+                s.add ("MACOSX_DEPLOYMENT_TARGET = " + deploymentTarget);
+
                 s.add ("MACOSX_DEPLOYMENT_TARGET_ppc = 10.4");
                 s.add ("SDKROOT_ppc = macosx10.5");
 
@@ -1947,6 +1952,8 @@ private:
             const String iosVersion (config.iosDeploymentTarget.get());
             if (iosVersion.isNotEmpty() && iosVersion != osxVersionDefault)
                 s.add ("IPHONEOS_DEPLOYMENT_TARGET = " + iosVersion);
+            else
+                s.add ("IPHONEOS_DEPLOYMENT_TARGET = 9.3");
         }
         else
         {