[issue4558] with_stdc89

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

Python core code must be compliant with the C89 standard but we don't
have any checks for C89 compatibility. This patch adds a clean way to
check our code base.

You can verify my patch by adding a // comment somewhere in the code and
./configure --with-stdc89 && make.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4558>
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