The keyword here is "linking exception". It is a hack to sidestep the licensing problems caused by dynamic linking. e.g. If I encase gcc in java, and release gcc.class under GPL3+, but use it extensively in a separate proprietary java program, does that infringe on the terms of the GPL? Does providing copies of the two together, with a single installer make a difference?

https://en.wikipedia.org/wiki/GPL_linking_exception