This issue is motivated by modules where it would be desirable to organize the source code by module and native library.

The issue for the pack200 is that the native code is used to build both libunpack and unpack200. It would be useful to re-visit this approach to see if were possible to split the unpack code from the JNI functions so that the unpack200 tool and the JNI library could be linked to a library with the pack200 code.