linux-kernel - Re: nouveau: r535.c:1266:3: error: label at end of compound statement default: with gcc-8

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Message-Id: <91dacd68-fdbe-4cb4-92c0-e5d6bc777658@app.fastmail.com>
Date: Mon, 29 Apr 2024 19:17:22 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Timur Tabi" <ttabi@...dia.com>,
 "Naresh Kamboju" <naresh.kamboju@...aro.org>,
 "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
 "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
 "lkft-triage@...ts.linaro.org" <lkft-triage@...ts.linaro.org>,
 "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Cc: "Anders Roxell" <anders.roxell@...aro.org>,
 "Dan Carpenter" <dan.carpenter@...aro.org>,
 "Danilo Krummrich" <dakr@...hat.com>
Subject: Re: nouveau: r535.c:1266:3: error: label at end of compound statement default:
 with gcc-8

On Mon, Apr 29, 2024, at 19:08, Timur Tabi wrote:
> On Mon, 2024-04-29 at 17:30 +0200, Linux regression tracking (Thorsten
> Leemhuis) wrote:
>> TWIMC, there is another report about this in this thread (sadly some of
>> its post did not make it to lore):
>> 
>> https://lore.kernel.org/all/162ef3c0-1d7b-4220-a21f-b0008657f8a5@redhat.com/
>> 
>> Ciao, Thorsten
>
> This doesn't fail on x86-64 when I build it.  I also did a cross-compile to
> arm64 with the arm64 defconfig, and it doesn't fail there either.
>
> I'm guessing this is a compiler version thing.  I'm using gcc 11.4.  Is that
> just too old?

It's too new: this is valid syntax in c23 and accepted by newer compilers
as an extension to gnu11, but older versions don't like it.

gcc-11 and clang-16 are fine, while gcc-10 and clang-15 as well as
earlier versions produce this warning.

      Arnd