Hi Jakub, On Tue, Oct 08, 2024 at 10:25:24AM GMT, Jakub Łukasiewicz wrote: > I think it would be beneficial to have different syntax/spelling for > features still in development. That way we, as a committee, can tweak it as > we please, while mitigating effect on early adopters. > > If what ends in final document is exactly the same as in early phrases, then > great, all users are left to do is simple find and replace. > > Warning about using an experimental feature that is prone to changes is > obviously useful, but it disappears after upgrade to latest standard. If > there were diverges between early and final versions, it would be nice to > have warnings about that too.
How about adding the __lower__ version now as a GNU extension with compatible semantics, and when it's closer to an ISO C2y release add the _Upper one? That gives us more freedom. Cheers, Alex > > ~ J.Ł. > > On 2024-10-07 19:35 CEST, Joseph Myers <josmy...@redhat.com> wrote: > > Patches 1, 2 and 3 are logically nothing to do with this feature. I'll > > wait for them to be reviewed so that we only have a single-patch series, > > before doing final review of the main patch. > > > > Since the feature was accepted as _Lengthof, that's the form that should > > be added to GCC; no __lengthof__ variant needed. In general in GCC, > > although not strictly required by the standard in this case, we use > > pedwarn_c23 (pass OPT_Wpedantic as the option) to diagnose the use of a > > new C2Y feature that's not in C23 (if -pedantic with a pre-C2Y standard, > > or -Wc23-c2y-compat even in C2Y mode), with appropriate testcases to > > verify this (error with -std=c23 -pedantic-errors, warning with -std=c23 > > -pedantic, no diagnostic with -std=c23 -pedantic-errors > > -Wno-c23-c2y-compat, no diagnostic with -std=c2y -pedantic-errors, > > warning with -std=c2y -pedantic-errors -Wc23-c2y-compat). (pedwarn_c23 > > handles that logic, you just need the pedwarn_c23 call and the tests for > > those various cases.) -- <https://www.alejandro-colomar.es/>
signature.asc
Description: PGP signature
