Re: [PATCH 04/11] UAPI: bcache: Fix use of embedded flexible array

[Jan Engelhardt]

On Tuesday 2018-10-09 17:41, David Howells wrote:

>Jan Engelhardt <jengelh@xxxxxxx> wrote:
>
>> """it [the array size expression] shall be a converted constant expression of
>> type std::size_t and its value shall be greater than zero."""
>> âhttp://eel.is/c++draft/dcl.array
>
>Interesting.  You're not actually quoting the full sentence:
>
>	If the constant-expression is present, it shall be a converted
>	constant expression of type stdâ::âsize_Ât and its value shall be
>	greater than zero.
>
>This suggests that:
>
>	__u64 ptr[]
>
>is actually valid

I think that kind of validity only goes for this kind of standalone 
decl:

	extern int myints[];

but not for []-inside-struct.