The file given to --compare-found-sources is not closed after being read by sjavac. This causes the build to fail on Windows since the makefile is trying to rename that file after being used and Windows won't let it because the sjavac server process is still holding a handle to it.

Suggested patch:

diff -r 500d36bee375 src/jdk.compiler/share/classes/com/sun/tools/sjavac/JavacState.java
--- a/src/jdk.compiler/share/classes/com/sun/tools/sjavac/JavacState.java Wed Nov 18 16:37:12 2015 +0530
+++ b/src/jdk.compiler/share/classes/com/sun/tools/sjavac/JavacState.java Thu Nov 19 11:54:10 2015 +0100
@@ -954,8 +954,7 @@
             }
         }
         // Read in the file and create another set of filenames with full paths.
- try {
- BufferedReader in = new BufferedReader(new FileReader(makefileSourceList));
+ try (BufferedReader in = new BufferedReader(new FileReader(makefileSourceList))) {
             for (;;) {
                 String l = in.readLine();
                 if (l==null) break;