[issue12801] C realpath not used by os.path.realpath

[Charles-François Natali]

Charles-François Natali <neologix at free.fr> added the comment:

> Patch to get #ifdef REALPATH_SUPPORT_NULL:

I'm not really familiar with autotools, but I have the impression that
this will only check that the given code snippet compiles (and it
will), and we want to check that a NULL buffer is supported at
runtime.
Am I missing something?

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<http://bugs.python.org/issue12801>
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