[pfx] Re: Postfix stable release 3.11.4 and legacy releases 3.10.11, 3.9.12, 3.8.18

Sean McBride via Postfix-users:
> On 22 Jun 2026, at 15:48, Wietse Venema wrote:
> 
> > Wouldn't -Wimplicit-fallthrough catch that?
> >
> > Sure. And it would break existing legtimate Postfix code.
> 
> Deliberate fallthrough can be annotated with [[fallthrough]], but as 
> that's new in C23, postfix probably can't use it yet. Still, it's easy 
> to create a macro that does some pre-C23 per-complier equivalents, like:
> 
> ```
> #if (defined(GCC_VERSION) && GCC_VERSION>=7000000) || blahblah)
>    #define POSTFIX_FALLTHROUGH __attribute__((fallthrough));
> #else
>    #define POSTFIX_FALLTHROUGH /* FALLTHROUGH */
> #endif
> ```
> 
> I've never contributed a patch to postfix before, but I could give it a 
> try...

If you can test this on systems:

- Compilers with and without this feature.

- With GCC, and with CLANG.

Note that Postfix does not use autotools.

	Wietse
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