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Message-ID: <627epdel4gidvu46u5ua2mclieqy3wwqbs7sxjgtgrsmkvn4up@ehu5ru6micnr>
Date: Mon, 18 Mar 2024 22:22:55 +0000
From: NRK <nrk@...root.org>
To: musl@...ts.openwall.com
Cc: Mike Cui <cuicui@...il.com>
Subject: Re: Potential bug in __res_msend_rc() wrt to union
initialization.
On Mon, Mar 18, 2024 at 05:34:42PM -0400, Rich Felker wrote:
> If the clang interpretation is going to be this, we can just reorder
> the union members so that the largest one is first.
Another option is to utilize implicit static initializer rules:
| if it is a union, the first named member is initialized (recursively)
| according to these rules, and any padding is initialized to zero bits;
So something like:
static union u zero;
union u u = zero;
Though, the "padding bits" part was added in C11 and wasn't present in
C99 in case you want to be pedantic about C99 conformance.
- NRK
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