[llvm-dev] Python 2 end-of-life and llvm

Reid Kleckner via llvm-dev llvm-dev at lists.llvm.org
Mon May 20 14:21:44 PDT 2019

I don't think those comments are necessarily authoritative. LLDB on Windows
basically requires Python 3, so I've been configuring my entire checkout
with -DPYTHON_EXECUTABLE=C:/src/Python37/python.exe, and things work OK.
However, I think that mainly controls how cmake invokes lit when you build
`check-llvm`, so I wouldn't be surprised if the longer tail of scripts is
Python2 only.

So, I think in practice, for important scripts that run as part of build &
test, we are Python 3 ready. For the long tail of things that developers
run locally (git-llvm, update_llc_test_checks.py, etc), I imagine things
are done on an ad hoc basis.

If someone wanted to do a lot of testing and try to make CMake prefer
python 3 if both are available, I think that would be reasonable now that
Python 2 is approaching EOL. On reflection, that was just a long, hopefully
nicer, way of saying "patches welcome." :)

On Sun, May 19, 2019 at 7:55 AM Zero Zero via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi,
> Python 2.7 will become obsolete in January 2020 [1] with no further
> maintenance. LLVM still explicitly does not support Python 3 [2]. Is there
> a plan or a tracking bug for things that need to be done to support Python
> 3? The only thing I could find was this [3] from over three years ago.
> Regards,
> Z
> 1. https://www.python.org/dev/peps/pep-0373/
> 2.
> https://github.com/llvm/llvm-project/blob/master/llvm/CMakeLists.txt#L668-L682
> 3. https://reviews.llvm.org/D20825
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