[issue28870] Reduce stack consumption of PyObject_CallFunctionObjArgs() and like

[STINNER Victor]

STINNER Victor added the comment:

I also tried to use alloca(): see attached alloca.patch. But the result is quite bad: 528 bytes of stack memory per call. I only attach the patch to discuss the issue, but I now dislike the option: the result is bad, it's less portable and more dangerous.

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Added file: http://bugs.python.org/file45917/alloca.patch

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