RFC: Update Intel386, x86-64 and IA MCU psABIs for passing/returning empty struct

[H.J. Lu]

On Thu, Feb 11, 2016 at 4:40 AM, Matthijs van Duin
<matthijsvanduin@gmail.com> wrote:
> On 11 February 2016 at 11:53, H.J. Lu <hjl.tools@gmail.com> wrote:
>> Since this isn't Plain Old Data (POD) for the purposes of layout, it
>> isn't covered by my proposal for psABI.  I leave this to C++ ABI.
>
> You never define "POD for the purposes of layout", and I can only
> interpret it as being equivalent to "standard-layout". The property of
> being trivially copyable/destructible is not a statement about layout
> and my EmptyInt example is POD in every other aspect.

"POD for the purpose of layout" is defined in the Itanium C++ ABI here:

http://mentorembedded.github.io/cxx-abi/abi.html#definitions


-- 
H.J.