linux-kernel - Re: older gccs and case labels producing integer constants

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Message-ID: <YkwbygWj/C3XooMV@zn.tnic>
Date:   Tue, 5 Apr 2022 12:36:58 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Richard Biener <rguenther@...e.de>
Cc:     linux-toolchains@...r.kernel.org, Michael Matz <matz@...e.de>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: older gccs and case labels producing integer constants

On Tue, Apr 05, 2022 at 12:06:45PM +0200, Richard Biener wrote:
> Wird auch mit gcc 11 rejected.  Kanns sein dass mit gcc 7 andere
> compiler flags genommen werden?

Found it:

$ gcc -fsanitize=shift -c switch.c
switch.c: In function ‘foo’:
switch.c:10:7: error: case label does not reduce to an integer constant
       case (((0xfc08) << 16) | (0x0101)):;

$ gcc --version
gcc (SUSE Linux) 7.4.1 20190905 [gcc-7-branch revision 275407]
Copyright (C) 2017 Free Software Foundation, Inc.

Something not fully backported?

Thx.

-- 
Regards/Gruss,
    Boris.

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