From: Michael Matz <matz@suse.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>,
linux-toolchains@vger.kernel.org,
Richard Biener <rguenther@suse.de>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: older gccs and case labels producing integer constants
Date: Tue, 5 Apr 2022 12:39:20 +0000 (UTC) [thread overview]
Message-ID: <alpine.LSU.2.20.2204051232101.963@wotan.suse.de> (raw)
In-Reply-To: <Ykw0wzdab0ICUFvy@hirez.programming.kicks-ass.net>
[-- Attachment #1: Type: text/plain, Size: 752 bytes --]
Hey,
On Tue, 5 Apr 2022, Peter Zijlstra wrote:
> > sound/usb/midi.c: In function ‘snd_usbmidi_out_endpoint_create’:
> > sound/usb/midi.c:1389:2: error: case label does not reduce to an integer constant
> > case (((0xfc08) << 16) | (0x0101)):
> > ^~~~
>
> IIRC GCC-8 fixed a bunch of -wrapv issues. Could be this is one of them
> I suppose.
Or better said, later GCCs returned back to the old behaviour of rejecting
this only with -pedantic even in the presence of -fsanitize. But
pedantically speaking (ahem!) it really isn't conforming c99 (which the
compilation flags claim) , and in this case it seems easy enough to make
the construct actually be conforming in the kernel sources, so that should
perhaps be done?
Ciao,
Michael.
next prev parent reply other threads:[~2022-04-05 14:59 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-05 9:50 older gccs and case labels producing integer constants Borislav Petkov
2022-04-05 9:58 ` Richard Biener
2022-04-05 10:04 ` Borislav Petkov
2022-04-05 10:06 ` Richard Biener
2022-04-05 10:36 ` Borislav Petkov
2022-04-05 10:45 ` Borislav Petkov
2022-04-05 11:41 ` Richard Biener
2022-04-07 15:16 ` Borislav Petkov
2022-04-05 11:37 ` Richard Biener
2022-04-06 9:53 ` Jakub Jelinek
2022-04-06 10:04 ` Jakub Jelinek
2022-04-05 12:23 ` Peter Zijlstra
2022-04-05 12:39 ` Michael Matz [this message]
2022-04-05 12:53 ` Richard Biener
2022-04-05 13:04 ` Borislav Petkov
2022-04-06 10:13 ` Jakub Jelinek
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