Re: [Qemu-devel] [PATCH v2 0/3] Fix strncpy() warnings for GCC8 new -Wstringop-truncation

[Paolo Bonzini]

On 18/12/18 15:54, Michael S. Tsirkin wrote:
> On Tue, Dec 18, 2018 at 03:45:08PM +0100, Paolo Bonzini wrote:
>> On 18/12/18 15:31, Michael S. Tsirkin wrote:
>>> Do you happen to know why does it build fine with
>>> Gcc 8.2.1?
>>>
>>> Reading the GCC manual it seems that
>>> there is a "nostring" attribute that means
>>> "might not be 0 terminated".
>>> I think we should switch to that which fixes the warning
>>> but also warns if someone tries to misuse these
>>> as C-strings.
>>>
>>> Seems to be a better option, does it not?
>>>
>>>
>>
>> Using strpadcpy is clever and self-documenting, though.  We have it
>> already, so why not use it.
>>
>> Paolo
> 
> The advantage of nonstring is that it will catch attempts to
> use these fields with functions that expect a 0 terminated string.
> 
> strpadcpy will instead just silence the warning.

Ah, I see.  We could also do both, that's a matter of taste.

Paolo