Re: [PATCH 3/4] pc-bios/s390-ccw: Silence GCC 11 stringop-overflow warning

[Philippe Mathieu-Daudé]

On 5/3/21 11:31 AM, Thomas Huth wrote:
> On 03/05/2021 11.30, Philippe Mathieu-Daudé wrote:
>> On 5/3/21 11:00 AM, Cornelia Huck wrote:
>>> On Sun,  2 May 2021 19:48:35 +0200
>>> Thomas Huth <thuth@redhat.com> wrote:
>>>
>>>> From: Philippe Mathieu-Daudé <philmd@redhat.com>
>>>>
>>>> When building on Fedora 34 (gcc version 11.0.0 20210210) we get:
>>>>
>>>>    In file included from pc-bios/s390-ccw/main.c:11:
>>>>    In function ‘memset’,
>>>>        inlined from ‘boot_setup’ at pc-bios/s390-ccw/main.c:185:5,
>>>>        inlined from ‘main’ at pc-bios/s390-ccw/main.c:288:5:
>>>>    pc-bios/s390-ccw/libc.h:28:14: warning: writing 1 byte into a
>>>> region of size 0 [-Wstringop-overflow=]
>>>>       28 |         p[i] = c;
>>>>          |         ~~~~~^~~
>>>>
>>>> The offending code is:
>>>>
>>>>    memset((char *)S390EP, 0, 6);
>>>>
>>>> where S390EP is a const address:
>>>>
>>>>    #define S390EP 0x10008
>>>>
>>>> The compiler doesn't now how big that pointed area is, so assume its
>>>
>>> s/now/know/
>>> s/assume/it assumes that/
>>
>> Oops, thanks. Thomas, do you want me to repost this patch fixed?
> 
> I can fix it up in my tree here, no need to resend.

Great, thank you!

Phil.