[Bug 204786] devel/libcxxrt: crash when mixing different languages with exceptions

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204786

            Bug ID: 204786
           Summary: devel/libcxxrt: crash when mixing different languages
                    with exceptions
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: mejedi at gmail.com

Unwind API was specifically designed to allow mixed language environments where
exceptions from different runtimes interoperate. One particular example is
C++/LuaJit combination. Due to the issues in libcxxrt, databases/tarantool
crashes when linked against libcxxrt.

__cxa_free_exception does the math wrong when converting from
_Unwind_Exception* to __cxx_exception*. _Unwind_Exception instance is actually
enclosed within __cxx_exception structure, the last member. The resulting
pointer is off by -32 bytes. Leads to a crash in _Unwind_DeleteException when
LuaJIT is releasing a C++ exception.

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