netdev - Re: [PATCHv2 iproute2-next 0/5] iproute2: add libbpf support

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Date:   Wed, 28 Oct 2020 19:33:08 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Hangbin Liu <haliu@...hat.com>
Cc:     David Ahern <dsahern@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        David Miller <davem@...emloft.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        Jiri Benc <jbenc@...hat.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Toke Høiland-Jørgensen 
        <toke@...hat.com>
Subject: Re: [PATCHv2 iproute2-next 0/5] iproute2: add libbpf support

On Thu, 29 Oct 2020 10:06:37 +0800
Hangbin Liu <haliu@...hat.com> wrote:

> On Wed, Oct 28, 2020 at 05:02:34PM -0600, David Ahern wrote:
> > fails to compile on Ubuntu 20.10:
> > 
> > root@...10-sfo3:~/iproute2.git# ./configure
> > TC schedulers
> >  ATM	yes
> >  IPT	using xtables
> >  IPSET  yes
> > 
> > iptables modules directory: /usr/lib/x86_64-linux-gnu/xtables
> > libc has setns: yes
> > SELinux support: yes
> > libbpf support: yes
> > ELF support: yes
> > libmnl support: yes
> > Berkeley DB: no
> > need for strlcpy: yes
> > libcap support: yes
> > 
> > root@...10-sfo3:~/iproute2.git# make clean
> > 
> > root@...10-sfo3:~/iproute2.git# make -j 4
> > ...
> > /usr/bin/ld: ../lib/libutil.a(bpf_libbpf.o): in function `load_bpf_object':
> > bpf_libbpf.c:(.text+0x3cb): undefined reference to
> > `bpf_program__section_name'
> > /usr/bin/ld: bpf_libbpf.c:(.text+0x438): undefined reference to
> > `bpf_program__section_name'
> > /usr/bin/ld: bpf_libbpf.c:(.text+0x716): undefined reference to
> > `bpf_program__section_name'
> > collect2: error: ld returned 1 exit status
> > make[1]: *** [Makefile:27: ip] Error 1
> > make[1]: *** Waiting for unfinished jobs....
> > make: *** [Makefile:64: all] Error 2  
> 
> You need to update libbpf to latest version.
> 
> But this also remind me that I need to add bpf_program__section_name() to
> configure checking. I will see if I missed other functions' checking.
> 
> Thanks
> Hangbin
> 

Then configure needs to check for this or every distro is going to get real mad...