On Thu, May 23, 2024 at 1:47 PM Aaron Ballman via Liaison <
liaison_at_[hidden]> wrote:

> On Thu, May 23, 2024 at 7:24 AM Robert Seacord via Liaison
> <liaison_at_[hidden]> wrote:
> >
> > I cannot think of any reasons why this paper would cause any C/C++
> compatibility issues.
>
> Aside from it meaning these C interfaces are mandatory in C++ but
> optional in C. ;-)
>

Which is not a compatibility concern afaict (though the reverse would be)


>
> This topic came up in WG14 as part of
> https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2889.htm and that
> paper was rejected because of concerns from several implementers. One
> of the concerns I recall was around implementations supporting very
> wide pointer types, such as capability-based memory architectures.
>

I think WG21 can decide independently whether it want to restrict the
compatible set of hardware more than C does

(As an aside, while I understand there are platforms where uintptr would
need to be bigger than sizeof(void*)... that's allowed!
It's what CHERI seem to be doing
https://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-947.pdf )


> ~Aaron
>
> >
> > Thanks,
> > rCs
> >
> > On Thu, May 23, 2024 at 6:17 AM Nina Dinka Ranns via Liaison <
> liaison_at_[hidden]> wrote:
> >>
> >> Hello,
> >>
> >> We have a question from the author of P3248R0 Require [u]intptr_t :
> >>
> >> - If C++ requires [u]intptr_t with the proposed semantics (same as C),
> does SG22 have any concerns w.r.t. C++ compatibility with C on platforms
> C++ supports?
> >>
> >> Thoughts ?
> >>
> >> Thank you,
> >> Nina
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