Hi Matteo,
Now setup.py will rebuild all every time, this is because the policy
of
newer_group in build_extension is to consider 'newer' any missing
file.
Here you certainly mean “older”.
[...] Can someone suggest me the reason of this choice
distutils’ notion of dependencies directly comes from make. A missing
(not existing) target is perfectly normal: it’s usually a generated
file
that make needs to create (i.e. compile from source files). In this
world, you want to (re-)compile when the target is older than the
sources, or when the target is missing.
So here your extension module is a target that needs to be created, and
when distutils does not find a file with the name you give in depends,
it
just thinks it’s another thing that will be generated.
This model is inherently prone to typos; I’m not sure how we can
improve
it to let people catch possible typos.
Cheers
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