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Status update.
* configure works: it checks options (like install does) and writes to a file.
* New design for build: It uses set_undefined_options to get options from configure (previously it read the cache file, but this caused nasty issues; I’ll document those designs some day, it was instructional for me). All tests pass.
* Same thing for install, but it’s harder to make it work. install.finalize_options checks for conflicts (for example you can’t set --user and --prefix=x) and then fills all options (so prefix gets a value). Now configure has the same checks, so that it does not write non-working options to the cache file. The problem is that all options are set in configure.finalize_install_options and then passed to install with set_undefined_options, and then install.finalize_options shouts at you because you can’t set all options. I tried a simple and stupid fix for that (disable option conflict check when options come from configure), which fixed all configure tests but caused test_core to fail. This means that while the configure tests passed, they were only superficially working; I have to be suspicious to my own tests and out general test coverage.