Mac OS X doesn't support DWARF yet and the compiler doesn't omit frame
pointers (though you can write asm functions which omit them), so for
now regular backtracing code will work fine in nearly all cases.
Unfortunately, MoreBacktrace should handle all cases, not nearly all,
so it'll take a little bit longer before it's ready.
Actually the compiler does emit enough dwarf2 to do this as you only
need the
information from -fasynchronous-unwind-tables which is the same
information that is
used for undwinding from exceptions.
-- Pinski
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