Christoph Groth schrieb am 03.05.2016 um 16:19:

The setup.py script of our package "kwant" uses Cython.Build.cythonize. Everything works well, except that for pyx files that cimport a module from "." an error message is generated. E.g. for the file "kwant/linalg/lapack.pyx" that contains the line

from . cimport f_lapack

The following message appears whenever setup.py is run:

missing cimport in module '.': kwant/linalg/lapack.pyx

No error message appears for files that cimport only from somewhere else than ".", e.g.:

from .defs cimport gint

The said messages do not seem to cause any problems, but they are of course somewhat of a nuiscance. They seem to be created by Cython.Build.Dependencies.cimported_files(). The culprit seems to be the function find_pxd in that module that does not seem to handle properly the case when module is ".".

Yes, that's a known problem. It only impacts the dependency collector that decides if a rebuild is necessary, and which is intentionally kept simple. It does not have an effect on the compiler itself. Looks like no-one has worked on this so far, but the correct code is available in other places (obviously) where the imports are resolved. Patches welcome. Stefan