netdev - Re: [PATCH iproute2] ip, route: fix minor compile warning

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Message-ID: <20151214155104.GE6555@orbit.nwl.cc>
Date:	Mon, 14 Dec 2015 16:51:04 +0100
From:	Phil Sutter <phil@....cc>
To:	Daniel Borkmann <daniel@...earbox.net>
Cc:	stephen@...workplumber.org, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2] ip, route: fix minor compile warning

On Mon, Dec 14, 2015 at 04:34:29PM +0100, Daniel Borkmann wrote:
> Seems like gcc (4.8.3) doesn't catch this false positive, triggering
> after 0f7543322c5f ("route: ignore RTAX_HOPLIMIT of value -1"):
> 
>   iproute.c: In function 'print_route':
>   iproute.c:301:12: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
>      features &= ~RTAX_FEATURE_ECN;
>               ^
>   iproute.c:575:10: note: 'val' was declared here
>       __u32 val;
>             ^
> So just shut it up by initializing to 0.

Hmm. Interestingly, my patch shouldn't have changed anything relevant
for gcc's decision. OTOH, I don't see a warning using gcc-4.9.3.

Cheers, Phil
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