linux-kernel - Re: [PATCH -next 006/491] ARM/RISCPC ARCHITECTURE: Use fallthrough;

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Message-ID: <81bad451e9ffee6990ffc3571bc7b558c1c26bb3.camel@perches.com>
Date:   Thu, 12 Mar 2020 03:19:57 -0700
From:   Joe Perches <joe@...ches.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH -next 006/491] ARM/RISCPC ARCHITECTURE: Use fallthrough;

On Thu, 2020-03-12 at 10:11 +0000, Russell King - ARM Linux admin wrote:
> On Tue, Mar 10, 2020 at 09:51:20PM -0700, Joe Perches wrote:
> > Convert the various uses of fallthrough comments to fallthrough;
> 
> And the point of what on the face of it seems to be useless churn is?
> 
> What compilers support this?

gcc 7.1, clang 9

clang does not support the /* fallthrough */ comment styles.

clang does support the __attribute__((__fallthrough__))
and the c++17 [[fallthrough]] weirdness.

see:

commit 294f69e662d1 ("compiler_attributes.h: Add 'fallthrough' pseudo
keyword for switch/case use")