--- old/src/share/classes/com/sun/tools/javac/main/Main.java	2013-06-20 12:18:13.110122043 -0400
+++ new/src/share/classes/com/sun/tools/javac/main/Main.java	2013-06-20 12:18:12.953120532 -0400
@@ -377,14 +377,25 @@
     }
 
     public Result compile(String[] args,
-                       String[] classNames,
-                       Context context,
-                       List<JavaFileObject> fileObjects,
-                       Iterable<? extends Processor> processors)
+                          String[] classNames,
+                          Context context,
+                          List<JavaFileObject> fileObjects,
+                          Iterable<? extends Processor> processors)
     {
         context.put(Log.outKey, out);
         log = Log.instance(context);
+        return compile(args,  classNames, context,
+                       fileObjects, processors, log);
+    }
 
+    // Added to allow tests to install their own log subclasses
+    public Result compile(String[] args,
+                          String[] classNames,
+                          Context context,
+                          List<JavaFileObject> fileObjects,
+                          Iterable<? extends Processor> processors,
+                          Log log)
+    {
         if (options == null)
             options = Options.instance(context); // creates a new one