[llvm-dev] [RFC] Python 2 / Python 3 status, final step(s)

[Serge Guelton via llvm-dev]

Hi Folks,

unless someone has strong arguments against it, the transition to Python 3
will happen *this week*, on Thursday morning, european time.
The associated review is https://reviews.llvm.org/D93097, feel free to drop
in.
The impact should be low, Python3 is already picked by CMake as default,
but a Python 2 fallback still exists, and it will be removed.

**If you're a bot owner** please make sure Python3 is available on your
system ! Now, is the time :-)

On Mon, Oct 19, 2020 at 9:34 PM Jonas Devlieghere via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Sounds good. In LLDB we have a slightly different timeline for the test
> suite (outlined in
> http://lists.llvm.org/pipermail/lldb-dev/2020-August/016388.html) but
> everything else aligns with the plan here. I already removed the fallback
> to Python 2 in preparation for the 12.0 release.
>
> On Tue, Oct 13, 2020 at 11:49 AM David Blaikie via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> *thumbs up*
>>
>> Re: out of date buildbots: maybe stage the shebang changes in a time/way
>> that's easy to rollback (or even intended to rollback after a small time
>> window (few hours) off-peak) to flush out the buildbots. Then after that
>> rollout, go over the buildbot failures and follow-up with buildbot owners
>> to get them cleaned up before a more intended-to-stick rollout is done.
>>
>> On Tue, Oct 13, 2020 at 7:18 AM James Y Knight via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>>> Yay, thanks for persevering with this migration!
>>>
>>> On Tue, Oct 13, 2020 at 8:04 AM Serge Guelton via llvm-dev <
>>> llvm-dev at lists.llvm.org> wrote:
>>>
>>>> Hi Folks,
>>>>
>>>> Now that LLVM 11.0.0 has been released, it's time to prepare for the
>>>> final step
>>>> envisionned in the previous RFC named *[RFC] Python 2 / Python 3
>>>> status* [0],
>>>> ie. requiring Python3.6 for LLVM 12.0.0, to be released in 2021.
>>>> At least Fedora already only ships Python3 and we didn't have much bugs
>>>> reported
>>>> wrt. Python compatibility for the LLVM toolchain.
>>>>
>>>> Indeed, all Python scripts should now be at least compatible with both
>>>> python2 (py2)
>>>> and python3 (py3), some of them already are already py3 only.
>>>>
>>>> The build system still depends on Python in a few place, but it
>>>> explicitly
>>>> mentions Python3_EXECUTABLE, and the main dependency (llvm-build) is
>>>> currently
>>>> being removed  in D89142.
>>>>
>>>> The shebangs have already been harmonized in D83857: some mention
>>>> /usr/bin/env
>>>> python, some mention /usr/bin/env python3, and none mention python2
>>>> anymore. It
>>>> would be great to have all script use the same shebang, PEP394 [1]
>>>> makes it
>>>> (relatively) clear that in our case, explicitly requiring python3 is
>>>> the way to
>>>> go.
>>>>
>>>> So basically, next step would be to update the documentation, remove
>>>> the Python2
>>>> fallback in root CMakeLists.txt and update shebangs.
>>>>
>>>> Anyone seeing an issue with that approach? I'm still a bit worried about
>>>> buildbots still running on py2 (?)
>>>>
>>>> Serge
>>>>
>>>> [0] http://lists.llvm.org/pipermail/llvm-dev/2020-January/138730.html
>>>> [1] https://www.python.org/dev/peps/pep-0394/
>>>>
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