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

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> When building of an extension has failed due to external reasons (e.g.
> headers from too old version of a Python dependency), user might prefer
> to be forced to fix these reasons, than to have Python built without an
> extension.

Ok - but your patch does not implement that. If the extension fails to
compile because the header files are not installed at all, even with
your patch, there is no error indication. So according to your
requirements, your patch is incorrect.

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