Auxiliary class warnings?

[David Holmes]

I now see a lot of warnings in the build like so:

/java/embedded/users/dh198349/build-infra/jdk/make/tools/src/build/tools/generatenimbus/SynthModel.java:207: 
Note: auxiliary class Rectangle in 
/java/embedded/users/dh198349/build-infra/jdk/make/tools/src/build/tools/generatenimbus/Shape.java 
should not be accessed from outside its own source file
         @XmlElement(name = "rectangle", type = Rectangle.class)
                                                ^
This seems to be due to Fredrik's javac enhancement for 
-Xlint:auxiliaryclass

Is there some reason this is turned on by default?

Aside: the Note is completely inappropriate as there are no Java 
language violations of any kind occurring. It should say "is being 
accessed" not "should not be accessed".

David