a little late to the party, but luajit is broken with clang because it needs
special libunwind support or something. that's the story so far.
anyway, looking closer at luajit I notice that "external" unwinding is only
the default on amd64. i386 and others use internal unwinding. one can also
disable unwinding by defining LJ_NO_UNWIND.
anyway, that's what I did, and things seem to work fine. there's a long
comment in src/lj_err.c that lays out the pros and cons of each approach,
mostly less c++ compat. i personally don't much care, and if it only works on
one architecture, I'd say it's questionable to rely on this feature.
maybe we can live without unwind in luajit?
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