On ke, 06 marras 2019, Miro Hrončok wrote:
On 06. 11. 19 11:41, Alexander Bokovoy wrote:
Python extension modules embedding Python and linking to libpython
- needs to be evaluated case by case
- changes to cmake/autotools are needed
- changes in code might be necessary as well
- if not changed, might misbehave
- Python Maint will provide help if asked for
Do you have a list of affected packages?
We anticipate that the number of affected packages that actually need
to link to libpython from extension modules is (very close to) 0.
But no, we don't have a list yet. We intent to go package by package
(see the list in the proposal) and examine the reason the file is
linked to libpython.
We are aware about samba linking to libpython and we anticipate
changes will be needed. This was already semi-discussed when samba
libs didn't build with Python 3.8.
If you'd be able to help us removing this linking dependency, that would
be great.
Samba (and thus SSSD and FreeIPA) is affected. It is pretty fundamental
that Samba modules link to libpython and I think it was designed so by
you guys (Python team at Red Hat) when we ported Samba bindings to Python3.
Why is it fundamental to link extension modules to libpython?
I wasn't directly involved with porting Samba, looping Lumír in.
However note that when samba was ported, it was common to ink Python
extension to libpython by default.
We had to support two different Python builds in parallel and had to do
a lot to link them properly to both runtimes in a correct way.
# find /usr/lib64/python3.7/site-packages/samba -name '*.so' | xargs
-n1 -I '{}' sh -c "ldd {} | egrep -q libpython && echo 'LINKED: {}'
"
LINKED: /usr/lib64/python3.7/site-packages/samba/_glue.cpython-37m-x86_64-linux-gnu.so
...
On Python 3.7, extension modules are linked to libpython by default.
On Python 3.8, extension modules are only linked to libpython if
explicitly told so by the build system, such as sambas's waf.
Extension modules built with distutils/setuptools are not linked to libpython.
Important pointer:
https://bugzilla.redhat.com/show_bug.cgi?id=1711638#c8 ... #c34
Thanks for the link, will read later.
--
/ Alexander Bokovoy
Sr. Principal Software Engineer
Security / Identity Management Engineering
Red Hat Limited, Finland
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