Re: Erroneous -Werror=missing-braces on old GCC

On Mon, 25 Dec 2023 at 10:42, Richard Guo <guofenglinux@gmail.com> wrote:
> I came across the 'missing braces' warning again when building master
> (0a93f803f4) on old GCC (4.8.5).
>
> blkreftable.c: In function ‘BlockRefTableSetLimitBlock’:
> blkreftable.c:268:2: warning: missing braces around initializer
> [-Wmissing-braces]
>   BlockRefTableKey key = {0}; /* make sure any padding is zero */
>   ^
>

I doubt if `key = {0}` equals `key = {{0}}`, since the second only
initialize the first field in `key`, it may depend on compiler to
initialize other fields (include padding).

> This has popped up a few times in the past, and it seems to be GCC bug
> 53119.  We previously used the {{...}} approach to suppress it.  Should
> we do the same here, like attached?
>
> FWIW, in the same file we initialize BlockRefTableSerializedEntry
> variables also with {{0}}.
>
> Thanks
> Richard


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Regrads,
Japin Li
ChengDu WenWu Information Technology Co., Ltd.