Re: [PATCH 09/10] netfilter: Add message pragma for deprecated xt_*.h, ipt_*.h.

[Szőke Benjamin]

2025. 01. 07. 23:38 keltezéssel, Jan Engelhardt írta:
> On Tuesday 2025-01-07 23:06, Szőke Benjamin wrote:
> > > I still don't know whether adding the pragmas to notify about header file
> > > deprecation is a good idea.
> >
> > Do you have any other ideas how can you display this information to the
> > users/customers, that it is time to stop using the uppercase header files then
> > they shall to use its merged lowercase named files instead in their userspace
> > SW?
>
> ``__attribute__`` is just as implementation-specific as ``#pragma``, so it's
> not really an improvement, but here goes:
>
> ----
> struct __attribute__((deprecated("This header file is deprecated"))) dontusethisstruct {
> };
> extern struct dontusethisstruct undefinedstruct;
> ----

As i know it is a feature only in GCC, can it work with Clang compiler?
https://renenyffenegger.ch/notes/development/languages/C-C-plus-plus/GCC/__attribute__/deprecated/index

By the way it is perfect for through a warning for a deprecated struct, function 
etc ... only in GCC, but it is not ideal to use a simple header file include and 
the syntax of it is horryble. Usage of a generic #pragma message is more 
feasible in all compilers.