[issue3375] _multiprocessing.so build problems

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

When a second 'make' fixes things, that usually means that there's a
dependency on another extension that is built later in the normal build
sequence. I vaguely we had this before and fixed it by reordering things.

Grepping the sources of _multiprocessing for Import, I wonder if it
could be _pickle?  Or something that _pickle imports?  (Since _pickle
seems to be built before _multiprocessing.)

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nosy: +gvanrossum

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