Re: [PATCH v3] perf python: Clean up and restructure setup.py

[Namhyung Kim <namhyung@kernel.org>]

On Thu, 23 Jul 2026 10:27:09 -0700, Ian Rogers wrote:
> Clean up and restructure the python setup script to resolve pylint
> warnings, improve code quality, and increase robustness and
> readability, targeting Python 3.9+ (the Linux kernel build minimum
> Python version).
> 
> Changes:
> - Restructure the script to use a `main()` function as the entry point,
>   leaving only imports, classes, and pure functions at module level.
> - Eliminate all global/module-level variables, making them local to
>   `main()` or the respective classes/functions.
> - Make `clang_has_option` a pure function by passing all necessary
>   parameters explicitly.
> - Extract clang compiler flag filtering into a new
>   `filter_clang_options` helper function. This function uses a loop
>   over a tuple of options, replacing ~30 lines of repetitive blocks
>   and reducing branch/statement complexity in the main flow.
> - Cleanly define attributes in `__init__` for `BuildExt` and
>   `InstallLib` and read environment variables dynamically within the
>   methods (including `srctree` in `InstallLib.run`), removing their
>   dependency on global variables.
> - Replace legacy Popen with subprocess.run for safer process handling.
> - Use quote-aware flag filtering (`shlex.split`, filter, `shlex.join`)
>   on sysconfig CFLAGS and OPT instead of regex `re.sub` substitutions.
>   This avoids boundary bugs and safely handles quoted arguments and
>   options with values.
> - Rely on setuptools to handle user CFLAGS from the environment
>   directly rather than manually prepending them to extra_compile_args.
> - Safely parse `CC` env var using `shlex.split` to handle quotes and
>   pass compiler arguments as `list[str]` lists to helper functions,
>   avoiding redundant string formatting and parsing.
> - Remove unused `import re`.
> - Rename setuptools command subclasses to PascalCase (BuildExt,
>   InstallLib).
> - Add type annotations to functions and methods.
> - Add missing docstrings for module, functions, and classes.
> - Split long lines to adhere to standard limits.
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung