[PATCH v2 1/2] string: _FORTIFY_SOURCE=3 using __builtin_dynamic_object_size

[Florian Weimer]

* Andreas Schwab:

> On Dez 14 2020, Florian Weimer via Libc-alpha wrote:
>
>> “have an additional performance overhead”?
>
> Isn't an overhead always in addition?

Compared to level 2?

Thanks,
Florian
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