Hi all!
On 2016-10-17 09:47, Kubilay Kocak wrote:
On 17/10/2016 6:22 AM, Ruslan Makhmatkhanov wrote:
- if port has a build dependency upon python and it can be built
both with python2 and python3, force it to build with python3 - if
some standalone application can be running both with python2 and
python3 and it have equivalent python3 dependencies, force it to be
run with python3
This can be achieved now by setting DEFAULT_VERSIONS= python=3
python3=3.5. See https://wiki.freebsd.org/DEFAULT_VERSIONS
And if I misunderstood you correctly and you meant force it via port
itself, I don't think we have a mechanism for that and even if we did,
that'd be very bad.
One such problem I've noticed is with shared dependencies. If port X can
work with 3, and port Y can only work with 2, and both have a common
dependency Z which can run both 2 and 3, Z won't be built for both,
it'll be built for DEFAULT_VERSION version, and if that's 3, it spells
trouble for Y. It'll build fine, but Y will fail at runtime.
Case in point was building py-sphinx and saltstack with Py3.5 set as
default. They both have a dependency that broke sphinx, iirc.
To fix this we desperately need variants.
https://reviews.freebsd.org/D5563
We also need to explicitly mark python2-only ports to simplify
switching to python3 as default at some point of time.
Definitely. I've started doing that, and caught some. weechat was one of
them which has been fixed now. But, because of my build server
reorganization I had to stop with that for some time and will pick it up
again with a permanent, bi-weekly (twice a week) poudriere build of ALL
ports that USE= python, with a public poudriere status page so we can
track how it goes.
What you guys think about? If there is general consensus, we may
enforce this via Porters Handbook.
I'm not sure the PHB is the right place. When I get the continuous
poudriere build going, I'll post to the mailing lists announcing it,
with an intention to pretty please let's switch to py3 as soon as
possible. Also see next:
I suggest we document something like a 'Road to Python 3 as Default'
page in the Python/ wiki outlining the goal (with timelines),
motivation, potential problems and possible alternative methods. Kind
of
like a Python PEP.
Definitely. I was thinking about that, inspired by Bernard's LibreSSL
list of ports that fail, to have a list of ports that:
a) Have USE= python but fail on 3
b) Have USE= python:2 but are actually supported on 3
But I need to get that poudriere running with a public status page for
that.
--
Vlad K.
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