linux-kernel - Re: [PATCH bpf] bpftool: fix compilation failure for net.o with older glibc

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Message-ID: <20210106213946.sfnjfiycieo3f3em@kafai-mbp.dhcp.thefacebook.com>
Date:   Wed, 6 Jan 2021 13:39:46 -0800
From:   Martin KaFai Lau <kafai@...com>
To:     Alan Maguire <alan.maguire@...cle.com>
CC:     <ast@...nel.org>, <daniel@...earbox.net>, <andrii@...nel.org>,
        <songliubraving@...com>, <yhs@...com>, <john.fastabend@...il.com>,
        <kpsingh@...nel.org>, <toke@...hat.com>, <wanghai38@...wei.com>,
        <quentin@...valent.com>, <netdev@...r.kernel.org>,
        <bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf] bpftool: fix compilation failure for net.o with
 older glibc

On Wed, Jan 06, 2021 at 03:59:06PM +0000, Alan Maguire wrote:
> For older glibc ~2.17, #include'ing both linux/if.h and net/if.h
> fails due to complaints about redefinition of interface flags:
> 
>   CC       net.o
> In file included from net.c:13:0:
> /usr/include/linux/if.h:71:2: error: redeclaration of enumerator ‘IFF_UP’
>   IFF_UP    = 1<<0,  /* sysfs */
>   ^
> /usr/include/net/if.h:44:5: note: previous definition of ‘IFF_UP’ was here
>      IFF_UP = 0x1,  /* Interface is up.  */
> 
> The issue was fixed in kernel headers in [1], but since compilation
> of net.c picks up system headers the problem can recur.
> 
> Dropping #include <linux/if.h> resolves the issue and it is
> not needed for compilation anyhow.
Acked-by: Martin KaFai Lau <kafai@...com>