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

[Arfrever Frehtes Taifersar Arahesis]

Arfrever Frehtes Taifersar Arahesis <Arfrever.FTA at GMail.Com> added the comment:

> 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.

`make` will return error:

$ cat Makefile
x:
        false
all: x
$ make
false
make: *** [x] Error 1
$ 

Also note that my original patch was created before I slightly changed
my suggestion :) .

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