llvm dev - Jan 2021 - Python version requirement

I just pushed a patch that uses CMake to actually enforce the minimum version of
Python 3.6. (https://reviews.llvm.org/D95635) On
https://llvm.org/docs/GettingStarted.html#software, we document that Python 3.6
is the minimum version of python that is required for LLVM, and some patches
have gone in to use Python 3.6 features. As of a few days ago, if you try to run
the test suite without python 3.6 or greater, you will get a syntax error in the
test suite python code. However, I had to revert my patch because some of the
build bots don't actually have Python 3.6. Specifically, I got a failure in
the fuchsia-x86_64-linux bot that has Python 3.5.3. I have no way of knowing if
any other infrastructure has this issue. (unless they email me to complain)

                I think that Ideally we want CMake to enforce the version
minimum, but we can't do that until the build bots are all updated. I wanted
to raise awareness of this issue so that hopefully we can get this sorted out
soon.

Thanks,
                Christopher Tetreault
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It was actually pointed out to me that the linked page just says "known to
work", not "minimum required", so now I'm very confused as to
what to do. I think two reasonable ways ahead are to just roll with it and
require 3.6, or to revert the recent patches that require it and to find the
lowest version that works with the resulting code. Thoughts?

From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Chris
Tetreault via llvm-dev
Sent: Friday, January 29, 2021 12:18 PM
To: llvm-dev at lists.llvm.org
Subject: [EXT] [llvm-dev] Python version requirement

                I just pushed a patch that uses CMake to actually enforce the
minimum version of Python 3.6. (https://reviews.llvm.org/D95635) On
https://llvm.org/docs/GettingStarted.html#software, we document that Python 3.6
is the minimum version of python that is required for LLVM, and some patches
have gone in to use Python 3.6 features. As of a few days ago, if you try to run
the test suite without python 3.6 or greater, you will get a syntax error in the
test suite python code. However, I had to revert my patch because some of the
build bots don't actually have Python 3.6. Specifically, I got a failure in
the fuchsia-x86_64-linux bot that has Python 3.5.3. I have no way of knowing if
any other infrastructure has this issue. (unless they email me to complain)

                I think that Ideally we want CMake to enforce the version
minimum, but we can't do that until the build bots are all updated. I wanted
to raise awareness of this issue so that hopefully we can get this sorted out
soon.

Thanks,
                Christopher Tetreault
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