Hi all,

Libunwind's configure.ac says that "C++ exception handling doesn't work too
well on x86" and so ./configure defaults to --disable_cxx_exceptions for
x86* (as on aarch64,arm,mips,tile).

I'd love to know a little more about the problem, and whether it's safe to
override this default and enable the flag anyway. Is it just a stale
comment? We are looking at using libunwind for emitting local stack traces,
and we use a lot of exceptions.

Thanks,
  Billy Donahue
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