Re: [PATCH for Xen 4.5] xen/arm: Add support for GICv3 for domU

[Julien Grall <julien.grall@linaro.org>]

On 11/18/2014 03:10 PM, Ian Jackson wrote:
> Julien Grall writes ("Re: [PATCH for Xen 4.5] xen/arm: Add support for GICv3 for domU"):
>> I need to create an empty structure. Is the dummy field really needed?
> 
> Empty structs are a gcc extension (`(gcc-4.4) Empty Structures').  I
> would be very surprised if clang didn't support them too.

AFAIK, clang doesn't complain about empty structures.

> AIUI our policy, gcc extensions are fine except in the Xen public
> headers.

We have at least 2 "empty" structure on the ARM public header.

>> If so, did you meant?
>>
>> struct
>> {
>>    int :0;
>> }
> 
> Whatever you do, don't do this!

Would something like below be better?

struct
{
  int dummy:1
};

Regards,

-- 
Julien Grall