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i.e. GCC emits _empty_ dwarf unwind information for thumb functions, rather than none at all. That's unlikely to work. We'd need to modify the dwarf2 unwinder to ignore empty FDEs.
I'll check in the non-dwarf parts now, and then we can figure out what to do about that.
Though of course a trivial leaf function *will* have an empty FDE. Consider
int func(void) { return 0;}
Which compiles to
mov r0, #0 bx lr
I would have thought that wouldn't need any frame unwind information. So we would have a problem distinguishing trivial cases from "not generated" cases.
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