[issue20935] Support building Python with Clang sanitizer rules

[Ned Deily]

Ned Deily added the comment:

("Cherry pick" has a special meaning for the release process.)

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nosy: +ned.deily
title: Cherry pick CFLAGS, add to flags for $(BUILDPYTHON) Makefile rule -> Support building Python with Clang sanitizer rules

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20935>
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