oh well, perhaps someday. Keep up the good work on Sourceboost, it's a great compiler.
As an alternative, perhaps easier...perhaps not. Would it be possible to link to libraries created with MPLAB? The idea being a blob of code such as the much desired CDC stack can be created with MPLAB then linked to a sourceboost codebase.
Even a manual process of static linking would help. Surely it's just a matter of getting the right function locations, making sure sourceboost doesn't clobber MPLAB variables and getting call stack conventions right. A shim of sourceboost code could surround the calls.