[PATCH v0 0/2] Add C23 stdbit.h functions

[Corinna Vinschen]

On Apr  3 17:08, Brian Inglis wrote:
> On 2026-04-03 11:14, Joel Sherrill wrote:
> > Sorry for the delay. I got back to Corrina's comment:
> > 
> >  > No, they are not.  Target was Cygwin with its own limits.h, but even in
> >  > newlib's limits.h, these WIDTH macros are not defined.  Incidentally,
> >  > they are not defined anywhere in the newlib-cygwin repo.  If this works
> >  > for you, you're probably overloading the newlib headers with rtems
> >  > headers.
> > 
> > RTEMS does indeed have its own limits.h. And it must be aligned with  C23.
> > 
> > And Cygwin has its own limits.h which has not been updated to have any of
> > the new C23 constants. Four show up in compiler error messages building
> > the stdbit code.
> > 
> > https://en.cppreference.com/w/c/header/limits.html
> > <https://en.cppreference.com/w/c/header/limits.html>
> > 
> > The stdbit.h addition needs a limits.h with the C23 constants.
> > 
> > Can those be added to the Cygwin limits.h? Then we can proceed with
> > the stdbit.h addition.
> 
> For fastest response, please submit a patch with subject like:
> 
> [PATCH] Cygwin: winsup/cygwin/include/limits.h: Add C23 ..._WIDTH definitions
> 
> similar to your RTEMS changes, using normal feature test macros as
> appropriate, with git format-patch & git send-email to:
> 
> Cygwin core component patch submission and discussion
> 						<cygwin-patches@cygwin.com>

Either that (patches are always welcome), or just use the
compiler-provided constants.


Thanks,
Corinna