linux-kernel - Re: [PATCH] unicode: refactor the rule for regenerating utf8data.h

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Date:   Sat, 27 Apr 2019 15:27:00 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Olaf Weber <olaf@....com>,
        Gabriel Krisman Bertazi <krisman@...labora.co.uk>,
        "Theodore Ts'o" <tytso@....edu>
Cc:     Gabriel Krisman Bertazi <krisman@...labora.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] unicode: refactor the rule for regenerating utf8data.h

On Sat, Apr 27, 2019 at 3:24 PM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> scripts/mkutf8data is used only when regenerating utf8data.h,
> which never happens in the normal kernel build. However, it is
> irrespectively built if CONFIG_UNICODE is enabled.
>
> Moreover, there is no good reason for it to reside in the scripts/
> directory since it is only used in fs/unicode/.
>
> Hence, move it from scripts/ to fs/unicode/.
>
> In some cases, we bypass build artifacts in the normal build. The
> conventianl way to do so is to surround the code with ifdef REGENERATE_*.


This is a typo.

conventianl -> conventional



> For example,
>
>  - 7373f4f83c71 ("kbuild: add implicit rules for parser generation")
>  - 6aaf49b495b4 ("crypto: arm,arm64 - Fix random regeneration of S_shipped")
>
> I rewrote the rule in a more kbuild'ish style.
>
> It works like this:
>
> $ make REGENERATE_UTF8DATA=1 fs/unicode/
>   [ snip ]
>   HOSTCC  fs/unicode/mkutf8data
>   GEN     fs/unicode/utf8data.h
>   CC      fs/unicode/utf8-norm.o
>   CC      fs/unicode/utf8-core.o
>   AR      fs/unicode/built-in.a
>
> Also, I added utf8data.h to .gitignore and dontdiff.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---




-- 
Best Regards
Masahiro Yamada