linux-kernel - Re: [PATCH] Makefile: Convert -Wimplicit-fallthrough=3 to just -Wimplicit-fallthrough for clang

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Message-ID: <871efd6113ee2f6491410409511b871b7637f9e3.camel@perches.com>
Date:   Sat, 10 Aug 2019 20:06:05 -0700
From:   Joe Perches <joe@...ches.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] Makefile: Convert -Wimplicit-fallthrough=3 to just
 -Wimplicit-fallthrough for clang

On Sat, 2019-08-10 at 19:04 -0700, Nathan Chancellor wrote:
> On a tangential note, how are you planning on doing the fallthrough
> comment to attribute conversion? The reason I ask is clang does not
> support the comment annotations, meaning that when Nathan Huckleberry's
> patch is applied to clang (which has been accepted [1]), we are going
> to get slammed by the warnings. I just ran an x86 defconfig build at
> 296d05cb0d3c with his patch applied and I see 27673 instances of this
> warning... (mostly coming from some header files so nothing crazy but it
> will be super noisy).
> 
> If you have something to share like a script or patch, I'd be happy to
> test it locally.
> 
> [1]: https://reviews.llvm.org/D64838

Something like this patch:

https://lore.kernel.org/patchwork/patch/1108577/

Maybe use:

#define fallthrough [[fallthrough]]

if the compiler supports that notation