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10c496d79c
Some MPI implementation report -lpthread in the compilation flags. Previously, we'd add -lpthread, but did not set threading=multi, as we really should. One manifestation of this issue is that when building with such an MPI, and requesting "threading=single threading=multi", we'd actually try to build two variants of everything, including "mpi.so" Python extension. And since Python extensions, at present, do not have their name adjusted for different variants, we'd get duplicate target name error. [SVN r57791]