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Message-ID: <20230524162643.584eea6e@inria.fr>
Date: Wed, 24 May 2023 16:26:43 +0200
From: Jₑₙₛ Gustedt <jens.gustedt@...ia.fr>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: [C23 divers headers 15/17] C23: add the unreachable
macro
Rich,
on Wed, 24 May 2023 10:21:05 -0400 you (Rich Felker <dalias@...c.org>)
wrote:
> On Wed, Apr 19, 2023 at 08:38:04AM +0200, Jens Gustedt wrote:
> > ---
> > include/stddef.h | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/include/stddef.h b/include/stddef.h
> > index f25b8639..09be5fb6 100644
> > --- a/include/stddef.h
> > +++ b/include/stddef.h
> > @@ -24,4 +24,6 @@
> > #define offsetof(type, member) ((size_t)( (char *)&(((type
> > *)0)->member) - (char *)0 )) #endif
> >
> > +#define unreachable() __builtin_unreachable()
> > +
> > #endif
> > --
> > 2.34.1
>
> This is a namespace violation unless protected by a C version check.
That would have been my first take also. I changed these things after
you (I think it was you) telling me that generally interfaces that are
added in newer versions of C need not be protected for older
version. I probably misunderstood something. Can you please clarify
under which circumstances you want feature tests and when not?
Thanks
Jₑₙₛ
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