netdev - Re: iproute2 build error due to sr-ipv6 lwtunnel

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Message-ID: <3c0c0584-338d-47d0-76d4-e4408decc2c1@uclouvain.be>
Date:   Thu, 4 May 2017 11:28:03 +0200
From:   David Lebrun <david.lebrun@...ouvain.be>
To:     Daniel Borkmann <daniel@...earbox.net>
CC:     <netdev@...r.kernel.org>, <stephen@...workplumber.org>
Subject: Re: iproute2 build error due to sr-ipv6 lwtunnel

On 05/04/2017 11:13 AM, Daniel Borkmann wrote:
> Hi David,
> 
> I'm getting the following build error from e8493916a8ed ("iproute:
> add support for SR-IPv6 lwtunnel encapsulation"). Reverting your
> commit makes iproute2 build again for me. Please take a look.

Hi Daniel,

This is because linux/seg6.h does an include of linux/in6.h (cf kernel
commit ea3ebc73b46fbdb049dafd47543bb22efaa09c8e "uapi: fix linux/seg6.h
and linux/seg6_iptunnel.h userspace compilation errors"), and iproute2's
include/utils.h requires the system /usr/include/resolv.h, which itself
includes /usr/include/netinet/in.h, re-defining struct in6_addr.

However, netinet/in.h protects some struct definitions with #ifndef
__USE_KERNEL_IPV6_DEFS, which is explicitly defined in
iproute_lwtunnel.c, thus avoiding this specific issue.

What is your glibc version ?

David

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