[llvm-dev] Migrate utils/ Python 2 scripts to Python 3

[陳韋任 via llvm-dev]

Does Python 3 have feature we want to use in LLVM codebase, and no
workaround there? If so, please give some examples. I think that makes the
discussion more concrete.

2018-01-30 4:46 GMT+08:00 Fāng-ruì Sòng via llvm-dev <
llvm-dev at lists.llvm.org>:

> Hi LLVM-Devs,
>
> I noticed that many Python scripts under utils/ have a shebang of
> `#!/usr/bin/python` (which is a symlink to python2.7 on many platforms)
> and some of them use Python 2 syntax that is not compatible with Python 3
> (e.g. print statements; str/bytes)
>
> I created a revision to migrate utils/update_{llc_,}_test_checks.py from
> Python 2 to Python 3 https://reviews.llvm.org/D42450 , the arguments
> against making it Python 3 is:
>
> * There are many Mac OS X users and Mac OS X 10.8 comes with Python 2.7
> pre-installed [0] but not Python 3.
> * Forcing scripts to use Python 3 (by doing so we can avoid some
> compatibility trouble) may not be a good idea.
>
> Python 2.7 was published in 2010 and planned as the last of the 2.x
> releases. It will not be maintained past 2020 and there is also a
> retirement page https://pythonclock.org/ .
>
> The second argument would not need to be addressed if the first one did
> not lay too much burden on developers. After all, we have to install
> `cmake, ninja/GNU Make / libedit(for lldb)` to build LLVM. These packages
> are not installed by default on many platforms.
>
> Thoughts on deprecating Python 2 for utils/ scripts (different from
> libclang or lldb scripts) which are not user-facing?
>
> [0]: https://docs.python.org/3/using/mac.html#getting-and-install
> ing-macpython
>
>
> Thanks,
> Fangrui
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>



-- 
Wei-Ren Chen (陳韋任)
Homepage: https://people.cs.nctu.edu.tw/~chenwj
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