netdev - Re: header conflict introduced by change to netfilter_ipv4/ip

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Message-ID: <20160225210856.GB10608@pox.localdomain>
Date:	Thu, 25 Feb 2016 22:08:56 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	Stephen Hemminger <shemming@...cade.com>
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	Mikko Rapeli <mikko.rapeli@....fi>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: header conflict introduced by change to
 netfilter_ipv4/ip_tables.h

On 01/06/16 at 09:20am, Stephen Hemminger wrote:
> This commit breaks compilation of iproute2 with net-next.
> 
> commit 1ffad83dffd675cd742286ae82dca7d746cb0da8
> Author: Mikko Rapeli <mikko.rapeli@....fi>
> Date:   Thu Oct 15 07:56:30 2015 +0200
> 
>     netfilter: fix include files for compilation
>     
>     Add missing header dependencies and other small changes so that each file
>     compiles alone in userspace.
>     
>     Signed-off-by: Mikko Rapeli <mikko.rapeli@....fi>
>     Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
> 
> For iproute2, a copy of kernel headers (from make install_headers) is used.
> After this change. the build of x_tables.c fails because IFNAMSIZ is already
> defined in net/if.h

There is another issue with this commit. iptables.h included from m_ipt.c
includes  xtables.h which includes <xtables-version.h> which is not
available on a system without xtables.

gcc -Wall -Wstrict-prototypes  -Wmissing-prototypes -Wmissing-declarations -Wold-style-definition -Wformat=2 -O2 -I../include -DRESOLVE_HOSTNAMES -DLIBDIR=\"/usr/lib\" -DCONFDIR=\"/etc/iproute2\" -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE  -DHAVE_SETNS -DHAVE_ELF -DCONFIG_GACT -DCONFIG_GACT_PROB -DIPT_LIB_DIR=\"/lib/xtables\" -DYY_NO_INPUT   -c -o m_ipt.o m_ipt.c
In file included from ../include/iptables.h:5:0,
                 from m_ipt.c:17:
../include/xtables.h:34:29: fatal error: xtables-version.h: No such file or directory
 #include <xtables-version.h>