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-mthreads 
  Support thread-safe exception handling on Mingw32. Code that relies on
  thread-safe exception handling must compile and link all code with the 
  -mthreads option. When compiling, -mthreads defines -D_MT; when linking,
  it links in a special thread helper library -lmingwthrd which cleans up
  per thread exception handling data. 

Are we always thread safe? I'm not even sure what exception handling
they refer to...

-- 
Dimi.