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From: Masahiro Yamada <masahiroy@kernel.org>
Date: Fri, 29 Mar 2024 18:59:26 +0900
Message-ID: <CAK7LNATQJ6HXwsY2ziDPnQ5AdhFHL=M=qPW2idyPQrumsXmkrQ@mail.gmail.com>
Subject: Re: [PATCH] scripts/unifdef: avoid constexpr keyword
To: Arnd Bergmann <arnd@kernel.org>
Cc: Tony Finch <dot@dotat.at>, Sam Ravnborg <sam@ravnborg.org>, Arnd Bergmann <arnd@arndb.de>, 
	Nathan Chancellor <nathan@kernel.org>, Nicolas Schier <nicolas@fjasle.eu>, linux-kbuild@vger.kernel.org, 
	Michal Marek <mmarek@suse.cz>, linux-kernel@vger.kernel.org
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On Thu, Mar 21, 2024 at 3:01=E2=80=AFAM Arnd Bergmann <arnd@kernel.org> wro=
te:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> Starting with c23, 'constexpr' is a keyword in C like in C++ and cannot
> be used as an identifier:
>
> scripts/unifdef.c:206:25: error: 'constexpr' can only be used in variable=
 declarations
>   206 | static bool             constexpr;              /* constant #if e=
xpression */
>       |                         ^
> scripts/unifdef.c:880:13: error: expected identifier or '('
>   880 |                 constexpr =3D false;
>       |                           ^
>
> Rename this instance to allow changing to C23 at some point in the future=
.
>
> Fixes: d8379ab1dde3 ("unifdef: update to upstream revision 1.190")

This can be a problem only for future kernels.
Is it worth adding Fixes?

Even if the kernel bumps to C23 at some point,
such a patch will not be backported.


--=20
Best Regards
Masahiro Yamada