[Buildroot] [PATCH 1/1] package/libselinux: fix build with python 3.8

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Hello,

+Matt Weber, SELinux stuff inside.

On Tue, 22 Oct 2019 09:45:00 +0200
Thomas Petazzoni <thomas.petazzoni@bootlin.com> wrote:

> So I believe the right fix is:

With this fix, the module builds properly. With
http://patchwork.ozlabs.org/patch/1181164/, it gets installed to the
target. However, importing the module fails:

Python 3.8.0 (default, Oct 21 2019, 21:15:12) 
[GCC 4.9.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import selinux
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "usr/lib/python3.8/site-packages/selinux/__init__.py", line 13, in <module>
ImportError: cannot import name '_selinux' from partially initialized module 'selinux' (most likely due to a circular import) (/usr/lib/python3.8/site-packages/selinux/__init__.pyc)

One interesting thing is that the name of the _selinux module is incorrect:

_selinux.cpython-38-x86_64-linux-gnu.so

See the "x86_64-linux-gnu" ? A properly working module has the following name:

alsaaudio.cpython-38-arm-linux-gnueabi.so

You might think _selinux.cpython-38-x86_64-linux-gnu.so is built for
x86-64, but it's not, it's properly cross-compiled for ARM:

$ file _selinux.cpython-38-x86_64-linux-gnu.so 
_selinux.cpython-38-x86_64-linux-gnu.so: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, stripped

More investigation is needed.

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com