apt produces the following output:

 /opt/jdk/jdk1.7.0/bin/apt -J-Xbootclasspath/p::/w/jjg/work/jtreg-failures/tl/7/langtools/build/classes @options7
apt Round : 1
filenames: []
options: com.sun.tools.javac.util.Options@1a679b7
apt Round : 2
filenames: [./src/Round1.java]
options: com.sun.tools.javac.util.Options@77a7f9
apt Round : 3
filenames: [./src/AhOne.java, ./src/AndAhTwo.java]
options: com.sun.tools.javac.util.Options@15663a2

Options should be printed in a more helpful format