Document a known modern compiler on windows bug.

PR: 3345
Submission By: jesse.glick@netbeans.com (Jesse Glick)


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@270107 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/javac.html

@@ -57,6 +57,13 @@ a JDK1.1 or higher to be set in java.home.
 </p>
 <p>This task will drop all entries that point to non-existant
 files/directories from the CLASSPATH it passes to the compiler.</p>
+<p><strong>Windows Note:</strong>When the modern compiler is used
+in unforked mode on Windows, it locks up the files present in the
+classpath of the <javac> task, and does not release them.  The side
+effect of this is that you will not be able to delete or move
+those files later on in the build.  The workaround is to fork when
+invoking the compiler.</p>
+</p>
 <h3>Parameters</h3>
 <table border="1" cellpadding="2" cellspacing="0">
   <tr>