Re: [PATCH 1/2] Handle component_ref to a structre/union field including flexible array member [PR101832]

[Qing Zhao via Gcc-patches]

> On Feb 8, 2023, at 2:20 PM, Siddhesh Poyarekar <siddh...@gotplt.org> wrote:
> 
> On 2023-02-08 14:09, Joseph Myers wrote:
>> What must be avoided is -pedantic diagnostics for
>> struct flex1 { int n; int data[1]; };
>> struct out_flex_end1 { int m; struct flex1 flex_data; };
>> regardless of whether considered flexible or not, since that's clearly
>> valid in standard C.
> 
> Are you sure about "regardless of whether considered flexible or not", since 
> ISTM the validity of the above in standard C is limited to when it's 
> considered a non-flexible array.  So with -pedantic it shouldn't warn, but it 
> also then shouldn't consider it a flexible array.
> 
> In other words, perhaps it makes sense to imply -fstrict-flex-arrays with 
> -pedantic?
I think -pedantic might imply -fstrict-flex-arrays=3, but not 
-fstrict-flex-arrays=n when n < 3. Right?

Qing
> 
> Sid