8261753: Test java/lang/System/OsVersionTest.java still failing on BigSur patch versions after JDK-8253702

Reviewed-by: rriggs

Author: RealCLanger

test/jdk/java/lang/System/OsVersionTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015 SAP SE. All rights reserved.
+ * Copyright (c) 2015, 2021, SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -24,6 +24,7 @@
 import jdk.test.lib.Platform;
 import jdk.test.lib.process.OutputAnalyzer;
 import jdk.test.lib.process.ProcessTools;
+import jtreg.SkippedException;
 
 /*
  * @test
@@ -49,8 +50,14 @@ public static void main(String args[]) throws Throwable {
         }
         else if (Platform.isOSX()) {
             OutputAnalyzer output = ProcessTools.executeProcess("sw_vers", "-productVersion");
-            if (!osVersion.equals(output.getOutput().trim())) {
-                throw new Error(osVersion + " != " + output.getOutput().trim());
+            String swVersOutput = output.getOutput().trim();
+            if (!osVersion.equals(swVersOutput)) {
+                // This section can be removed if minimum build SDK is xcode 12+
+                if (swVersOutput.startsWith(osVersion)) {
+                    throw new SkippedException("MacOS version only matches in parts, this is expected when " +
+                                               "JDK was built with Xcode < 12 and MacOS version patch is > 0");
+                }
+                throw new Error(osVersion + " != " + swVersOutput);
             }
         }
         else if (Platform.isAix()) {