Are you sure you build is failing? It looks like it succeeded, if we only speak about the build.

You're seeing AddressSanitizer reports because, during the build, the built python is used. Like in `./python -E -S -m sysconfig --generate-posix-vars`.

So if you see AddressSanitizer output, it's because a `./python` has been successfully built and used.

The built cpython with AddressSanitizer however reports leaks, which is probably reproductible by running, typically:

  ./python -c ''