bpo-43774: Document the Python Build System by vstinner · Pull Request #25302 · python/cpython
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I found https://en.wikipedia.org/wiki/PurifyPlus but I'm not sure if it's this software. In case of doubt, I prefer to omit it.
Yeah, it's closed source. GCC and Clang have now great open source implementations (ASAN, UBSAN, etc.) supported by Python, see the Debug Options in this document.