Title: Python ABIFLAGS rebuild needed
Author: Mike Gilbert <floppym@gentoo.org>
Content-Type: text/plain
Posted: 2015-12-16
Revision: 5
News-Item-Format: 1.0
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For several years, Gentoo has been patching python3 in a way that is
incompatible with PEP 3149 [1]. Gentoo has been enabling the PyMalloc feature,
but our python packages have not carried the appropriate ABI flag.

We have removed this patch from the most recent dev-lang/python ebuilds at
the time of this writing. One result of this is that any packages which
install python extension modules must be rebuilt.

You may experience build failures in related packages until this rebuild has
been completed.

You can rebuild affected packages using the following commands.

emerge -1v $(find /usr/lib*/python3* -name '*cpython-3[3-5].so')
emerge -1v /usr/include/python3.{3,4,5}

It is possible that these commands will do nothing (or display a syntax error)
if all affected packages have already been rebuilt, causing the relevent files
to no longer exist.

References:
[1] https://www.python.org/dev/peps/pep-3149/