libgcc exception handling not thread safe

[Andreas Damm]

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libgcc.a in the gcc package does not seem to be thread safe with regards
to c++ exception handling. Doing a nm libgcc.a does not show any
dependencies on Windows synchronisation and thread functions (e.g.
InterlockedIncrement and TlsAlloc).

When compiling a c++ program with -mno-cygwin which runs multiple threads
it will eventually crash.

Should this be fixed?


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