> On Apr 17, 2015, at 9:14 AM, Peter Sewell <peter.sew...@cl.cam.ac.uk> wrote:
>
> Dear gcc list,
>
> we are trying to clarify what behaviour of C implementations is
> actually relied upon in modern practice, and what behaviour is
> guaranteed by current mainstream implementations (these are quite
> different from the ISO standards, and may differ in different
> contexts).
I’m not sure what you mean by “guaranteed”.
I suspect what the GCC team will say is guaranteed is “what the standard says”.
If by “guaranteed” you mean the behavior that happens to be implemented in a
particular version of the compiler, that may well be different, as you said.
But it’s also not particularly meaningful, because it is subject to change at
any time subject to the constraints of the standard, and is likely to be
different among different versions, and for that matter among different target
architectures and of course optimization settings.
paul
