[issue6731] Add option of non-zero exit status of setup.py when building of extensions has failed

[Jean-Paul Calderone]

Jean-Paul Calderone <exarkun at divmod.com> added the comment:

This makes it more easily possible for automated systems to detect that
there was a problem with the build.

Checking an exit code is easy.  Grabbing and parsing stdout and stderr
is hard and fragile.

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nosy: +exarkun

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<http://bugs.python.org/issue6731>
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