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Well, that escalated quickly :-)
I think I should clarify my use case that resulted in raising this bug.
1. Create a fresh hg clone, say, ~/hg/cpython-3.2.
2. Make it readonly: `zfs set readonly=on tank/home/cpython/hg/cpython-3.2`
3. cd /tmp/cpython-3.2-build
4. /home/cpython/hg/cpython-3.2/configure --srcdir=/home/cpython/hg/cpython-3.2/configure
So, my patches address that use case. The thing I like about the approach above is that I can set the source directory to readonly immediately -- I don't have to do an intermediate ./configure in that directory in order to generate a Makefile so I can `make touch`. (Side note: I'm almost certain `make touch` wouldn't work for my use case.)
Richard: what was your use case? What steps did you take that resulted in getting typeslots.inc and _sysconfigdata.py written to?
....although I just tried an out-of-tree build with 'default' using the exact steps above and got the same error with _sysconfigdata.py.
Martin: I think I understand your arguments, and I (think) I agree with them. Especially your last point with regards to always running ASDLGEN.
I think I'm +1 on reverting and trying the '-' approach originally used by Neil.