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

[James Y Knight via llvm-dev]

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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