linux-kernel - Re: [RFC PATCH] compiler_attributes.h: Add 'fallthrough' pseudo keyword for switch/case use

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Message-ID: <CANiq72=s1nu9=R9ypFwL+J4NGT_yUkwahpgOOOXzezvNfDrx5g@mail.gmail.com>
Date:   Thu, 1 Aug 2019 01:55:47 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     "H. Peter Anvin" <hpa@...or.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Joe Perches <joe@...ches.com>, Pavel Machek <pavel@....cz>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "Gustavo A . R . Silva" <gustavo@...eddedor.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Shawn Landden <shawn@....icu>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] compiler_attributes.h: Add 'fallthrough' pseudo
 keyword for switch/case use

On Wed, Jul 31, 2019 at 11:01 PM <hpa@...or.com> wrote:
>
> The standard is moving toward adding this as an attribute with the [[fallthrough]] syntax; it is in C++17, not sure when it will be in C be if it isn't already.

Not yet, but it seems to be coming:

  http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2268.pdf

However, even if C2x gets it, it will be quite a while until the GCC
minimum version gets bumped up to that, so...

Cheers,
Miguel