2013/12/15 mame (Yusuke Endoh) <mame / tsg.ne.jp>:
> Issue #9249 has been updated by mame (Yusuke Endoh).
>
> In principle, Boehm GC tries to use, in turn, getcontext, __builtin_unwind_init, and then setjmp.

I think they are not supposed to be used for conservative GC.
So they may encrypt pointers eventually.
-- 
Tanaka Akira