This is probably one in a serious of CRs with regard to build infrastructure changes, that will include:

* parallel javac compilation (per package), using -implicit:none
* possible re-use of implicitly compiled classes
* possible use of javac server to avoid restarting JVMs
* full and complete dependencies in the makefiles
* shared (common) makefile logic used by all repositories
* build deps feature that automatically installs any non-system software needed for the builds from a build serve
* autoconf setup for the pattern:
   ./configure && make && make test && make [install or packages]

Plus more....
In addition, in the corba repository the idlj tool from the boot is used and it should build a bootstrap idlj from it's sources, and use that in the corba build, then build an official idlj tool as part of the deliver. Just like langtools.