Differences between clang and gcc handling of int[static n] function arguments

[Florian Weimer]

* Jonathan Wakely via Gcc:

>> It seems it might even be trivial enough for me to investigate and
>> tackle myself, in some spare time.
>>
>> I see very little code using either of these features, so it's
>> definitely not a high priority task regardless.
>>
>
> Glibc uses the nonnull attribute in many places. Libstdc++ uses it in a few
> places.

Note that the glibc uses are frequently incompatible with libstdc++
(std::vector in particular).  Unfortunately, there is no consensus to
fix this.  For example, one issue is that

  memset(vec.data(), 0, sizeof(decltype(vec)::value_type) * vec.size())

isn't necessarily defined even for vectors of POD type.

Thanks,
Florian