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gengtype vs ObjC++

While everybody else gets to work on compiler speedup :-), I'm stuck
with the somewhat mundane task of getting our ObjC++ implementation
to work with gengtype machinery.  Conceptually, it's simple; ObjC++
just needs to be able to trace all the roots in Objective-C, plus
all the roots in C++, effectively a union of gtype-objc.h and

However, gengtype seems to be very big on the idea of having
gtype-<lang>.h synthesized from a <lang>/foo.h file.  But if I make
a synthetic objcp/all.h made by catting cp/decl.h etc plus
objc/objc-act.h, I get a bunch of duplicate structure errors, and
even if I dike out the error reports in gengtype, the result is still
missing all the root tables for C++, so I'm still being outsmarted

Is this a plausible approach, or should I look for something else?
Gluing gtype-objc.h and gtype-cp.h together seems hard because
of the way the root tables are built up.  Could it work to have
the ObjC roots always in cc1plus, but be empty/undefined?


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