[issue5309] distutils doesn't parallelize extension module compilation

[Éric Araujo]

Éric Araujo added the comment:

> self.parallel = int(self.parallel) would raise ValueError when a
> non-number is passed. I suggest to print user-friendly error message.

The distutils idiom would be to catch the TypeError/ValueError and raise DistutilsOptionError.  Higher layers convert that to a message.

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<http://bugs.python.org/issue5309>
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