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Message-ID: <20240421122358.33440bcb@inria.fr>
Date: Sun, 21 Apr 2024 12:23:58 +0200
From: Jₑₙₛ Gustedt <jens.gustedt@...ia.fr>
To: Markus Wichmann <nullplan@....net>
Cc: musl@...ts.openwall.com
Subject: Re: Alignment attribute in headers
Markus,
on Sun, 21 Apr 2024 09:38:38 +0200 you (Markus Wichmann
<nullplan@....net>) wrote:
> Am Sun, Apr 21, 2024 at 09:16:05AM +0200 schrieb Jₑₙₛ Gustedt:
> > Since this is unified starting with C23 and I think we morally
> > should have C conformance first and fallbacks only if imperatively
> > needed I would go for
> >
>
> Ugh. Let the bike shedding begin. I will tell you that moral arguments
> about software don't make a lot of sense to me, though.
I am not a native speaker, but I think this is generally used as
figure of speech for "there got reasons to do something".
> > #if __STDC_VERSION >= 202311L || __cplusplus >= 201100L
> > /* use alignas */
> > #elif __STDC_VERSION >= 201100L
> > /* use _Alignas */
> > #elif __GNUC__
> > /* use attribute */
> > #endif
> >
>
> Did you not read the part about the GCC version that claims C11
> conformance but doesn't have _Alignas? Yes, that's a bug. Yes, it was
> fixed. No, musl can't break compatibility with it.
ah, sorry
then how about
#if __GNUC__ /* or ifdef if preferable for some reason */
/* use gcc attribute */
#elif __STDC_VERSION >= 202311L || __cplusplus >= 201100L
/* use alignas */
#elif __STDC_VERSION >= 201100L
/* use _Alignas */
#endif
Thanks
Jₑₙₛ
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