linux-kernel - Re: [PATCH v2 4/9] gen_compile_commands: reword the help message of -d option

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Date:   Sat, 22 Aug 2020 10:55:50 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Nathan Huckleberry <nhuck@...gle.com>,
        Tom Roeder <tmroeder@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/9] gen_compile_commands: reword the help message of
 -d option

On Sat, Aug 22, 2020 at 9:29 AM 'Nick Desaulniers' via Clang Built
Linux <clang-built-linux@...glegroups.com> wrote:
>
> On Fri, Aug 21, 2020 at 12:02 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >
> > I think the help message of the -d option is somewhat misleading.
> >
> >   Path to the kernel source directory to search (defaults to the working directory)
> >
> > The part "kernel source directory" is the source of the confusion.
> > Some people misunderstand as if this script did not support separate
> > output directories.
> >
> > Actually, this script also works for out-of-tree builds. You can
> > use the -d option to point to the object output directory, not to
> > the source directory. It should match to the O= option used in the
> > previous kernel build, and then appears in the "directory" field of
> > compile_commands.json.
> >
> > Reword the help message.
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> > Changes in v2:
> >   - New patch
> >
> >  scripts/gen_compile_commands.py | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/scripts/gen_compile_commands.py b/scripts/gen_compile_commands.py
> > index 1b9899892d99..5f6318da01a2 100755
> > --- a/scripts/gen_compile_commands.py
> > +++ b/scripts/gen_compile_commands.py
> > @@ -31,13 +31,13 @@ def parse_arguments():
> >
> >      Returns:
> >          log_level: A logging level to filter log output.
> > -        directory: The directory to search for .cmd files.
> > +        directory: The work directory where the objects were built
>
> Punctuation (add a period `.`).

Will fix.


> >          output: Where to write the compile-commands JSON file.
> >      """
> >      usage = 'Creates a compile_commands.json database from kernel .cmd files'
> >      parser = argparse.ArgumentParser(description=usage)
> >
> > -    directory_help = ('Path to the kernel source directory to search '
> > +    directory_help = ('specify the output directory used for the kernel build '
>
> Capitalization (specify -> Specify)




The help message of -h starts with a lower case.
The others start with a capital letter.

It would be better if "show this help message and exit"
started with a capital letter. But, it comes from the
library, so I do not know how to change it.

I changed our code to make it consistent, but
starting them with a capital letter is a preferred style,
I can do as you suggest.


Currently, the help looks like follows:

---------------->8-----------------------
masahiro@...ar:~/ref/linux$ ./scripts/gen_compile_commands.py  -h
usage: gen_compile_commands.py [-h] [-d DIRECTORY] [-o OUTPUT]
                               [--log_level LOG_LEVEL]

Creates a compile_commands.json database from kernel .cmd files

optional arguments:
  -h, --help            show this help message and exit
  -d DIRECTORY, --directory DIRECTORY
                        Path to the kernel source directory to search
                        (defaults to the working directory)
  -o OUTPUT, --output OUTPUT
                        The location to write compile_commands.json
                        (defaults to compile_commands.json in the search
                        directory)
  --log_level LOG_LEVEL
                        The level of log messages to produce (one of
                        DEBUG, INFO, WARNING, ERROR, CRITICAL; defaults to
                        WARNING)
---------------->8-----------------------



Thanks.


-- 
Best Regards
Masahiro Yamada