[pkg-uWSGI-devel] Bug#865224: uwsgi: ftbfs with multiple supported python3 versions

[Scott Kitterman]

On Friday, July 14, 2017 12:37:12 AM Niko Tyni wrote:
> On Fri, Jun 30, 2017 at 10:28:09PM +0200, Jonas Smedegaard wrote:
> > Quoting Scott Kitterman (2017-06-30 08:25:19)
> > 
> > > On Tue, 20 Jun 2017 11:26:35 +1200 Michael Hudson-Doyle
> > > 
> > > <michael.hudson at ubuntu.com> wrote:
> > > > This may well turn out to be a cdbs bug in the end, but uwsgi does
> > > > not build when pysupport -r returns more than one version:
> > > > 
> > > > https://launchpadlibrarian.net/323025281/buildlog_ubuntu-artful-amd64.
> > > > uwsgi_2.0.15-1ubuntu3_BUILDING.txt.gz
> > > > 
> > > > Picking out the failing lines:
> > > > 
> > > > *** asyncio_python27 plugin built and available in
> > > > ./asyncio_python27_plugin.so *** touch
> > > > debian/stamp-uwsgi-plugin-asyncio-python
> > > > debian/rules:452: *** no python implementation resolved from flavor
> > > > "python3.6" among packages python-uwsgidecorators
> > > > python3-uwsgidecorators.  Stop.
> > > > 
> > > > In this build python 3.5 is the default and python 3.6 is supported.
> > > > In a build where python 3.6 is default and python 3.5 is supported,
> > > > the error complains about python 3.5 instead. And if python 3.6 is
> > > > the only supported version, the build completes successfully. So I
> > > > think this is really a problem in uwsgi or cdbs' handling of
> > > > multiple supported python versions.
> > > 
> > > We now have this in Debian, so bumping to serious.
> > 
> > Thanks, both for reporting initially and for bumping!
> 
> It looks like a cdbs issue to me,
>   $(call cdbs_expand_pythonruntime,,python3.6)
> breaks while
>   $(call cdbs_expand_pythonruntime,,python3.5)
> works (and results in "python3" as expected.)
> 
> A workaround that seems to help is putting
>  X-Python3-Version: 3.5
> in the Source paragraph of debian/control to prevent it from trying 3.6
> at all. This makes the build work for me (but doesn't help the python3.6
> transition of course.)
> 
> This is the worst blocker for the Perl 5.26 transition too (uwsgi needs
> to be rebuilt because uwsgi-plugin-psgi links against libperl), so even
> a temporary ugly workaround would be appreciated from this side :)

Changing the python3-all-dev build-depends to python3-dev would accomplish the 
same thing while allowing a binNMU to work when we make python3.6 default.  
Since this is blocking your work, I would recommend you NMU with that change 
(I have forgotten approximately everything I ever new about CDBS, so I don't 
mess with CDBS packages if I can possibly avoid it - I don't plan to do this 
NMU).

Scott K
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