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Message-ID: <20240319213640.GN4163@brightrain.aerifal.cx>
Date: Tue, 19 Mar 2024 17:36:41 -0400
From: Rich Felker <dalias@...c.org>
To: NRK <nrk@...root.org>
Cc: Jāāā Gustedt <jens.gustedt@...ia.fr>,
musl@...ts.openwall.com, Mike Cui <cuicui@...il.com>
Subject: Re: Potential bug in __res_msend_rc() wrt to union
initialization.
On Tue, Mar 19, 2024 at 09:04:41PM +0000, NRK wrote:
> > actually the introduction of `{}` versus `{0}` in C23 was not meant to
> > provide any difference in semantics, just to make the syntax nicer and
> > consistent with C++.
>
> Regardless of what the intention was, the reality is that it *does* have
> semantic difference. Specifically, empty initialization `{}` benefits
> from the default initialization rules, which specify zero-ing out the
> padding bits whereas `{0}` doesn't guarantee that.
That's simply not true. There is no difference in the rules as
specified by the standard.
Rich
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