linux-kernel - Re: [PATCH 1/2] Compiler Attributes: add support for _

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Date:   Mon, 22 Oct 2018 10:17:44 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Kees Cook <keescook@...omium.org>, gustavo@...eddedor.com,
        "Theodore Ts'o" <tytso@....edu>,
        Greg KH <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>, dan.carpenter@...cle.com,
        adilger.kernel@...ger.ca,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>, rostedt@...dmis.org,
        mchehab+samsung@...nel.org, olof@...m.net,
        Konstantin Ryabitsev <konstantin@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Paul Lawrence <paullawrence@...gle.com>,
        sandipan@...ux.vnet.ibm.com,
        Andrey Konovalov <andreyknvl@...gle.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        paul.burton@...s.com, David Rientjes <rientjes@...gle.com>,
        Willy Tarreau <w@....eu>, msebor@...il.com, sparse@...isli.org,
        Jonathan Corbet <corbet@....net>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>, joe@...ches.com,
        Arnd Bergmann <arnd@...db.de>, asmadeus@...ewreck.org,
        Stefan Agner <stefan@...er.ch>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-doc@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-sparse@...r.kernel.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH 1/2] Compiler Attributes: add support for __fallthrough
 (gcc >= 7.1)

On Mon, Oct 22, 2018 at 2:43 AM Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
>
> On Mon, Oct 22, 2018 at 11:41 AM Miguel Ojeda
> <miguel.ojeda.sandonis@...il.com> wrote:
> >
> >   * clang does *not* support the attribute in C.
>
> ...nor the warning at all, by the way (which is why this is OK).
>
> Cheers,
> Miguel

Oh? We're going through and annotating all of Android's C++ source
right now with it.
https://clang.llvm.org/docs/DiagnosticsReference.html#wimplicit-fallthrough

Though it looks like the attribute syntax I like from GCC is not yet
supported in Clang.
https://bugs.llvm.org/show_bug.cgi?id=37135
https://github.com/ClangBuiltLinux/linux/issues/235
I'll take a look at adding support.

So Kees sent me this embarrassing example:
https://godbolt.org/z/gV_c9_
(try changing the language from C++ to C; it works)!  That's embarrassing!
https://bugs.llvm.org/show_bug.cgi?id=39382
https://github.com/ClangBuiltLinux/linux/issues/236
Will get these both fixed up.
-- 
Thanks,
~Nick Desaulniers