Implement an undocumented _US_FORCE_UNWIND state for force
Why not add this to the public interface in include/unwind.h? If we're matching the behavior between gcc's unwinder, then perhaps it makes sense to 'advertise' that fact.
can the state ever be set to just _US_FORCE_UNWIND? Also, continue_unwind() takes three parameters now... can you rebase this patch?
Thanks. I have moved this flag to unwind.h.
Some explaination on this: Although _Unwind_Backtrace() only uses one of the case, it is required to implement the personality for both _US_VIRTUAL_UNWIND_FRAME and _US_UNWIND_FRAME_STARTING cases.
p.s. The later case is used by _Unwind_ForcedUnwind(). However, it is not working yet. I am debugging at the moment.