The values that are used are (apparently) correct, but most of sysconfig is not. That's very confusing, and makes it difficult to debug. I'm glad I get to maintain the *other* monster (MSBuild) :)

I would much rather sysconfig had a single variable pointing directly to whatever source of information it needs to tell everything about any Python install, whether that's _sysconfigdata or something else.

But I've also got my stuff working with only a minimal patch, so I'm not too concerned here. I'll go invest my time in improving the Windows cross-compilation support.