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From:   Joel Fernandes <joelaf@google.com>
Date:   Tue, 14 Aug 2018 18:22:21 -0700
Message-ID: <CAJWu+orb35w6O5B9KyHdYtwc2RbaR9d72HW-i5Bsup72QP8Oag@mail.gmail.com>
Subject: Re: samples don't build on v4.18
To:     LKML <linux-kernel@vger.kernel.org>, wangnan0@huawei.com,
        "open list:BPF (Safe dynamic programs and tools)" 
        <netdev@vger.kernel.org>, Alexei Starovoitov <ast@kernel.org>,
        acme@kernel.org, Chenbo Feng <fengc@google.com>,
        Jakub Kicinski <jakub.kicinski@netronome.com>
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Forgot to add the patch author, doing so now. thanks

On Tue, Aug 14, 2018 at 6:20 PM, Joel Fernandes <joelaf@google.com> wrote:
>
> Hi,
> When building BPF samples on v4.18, I get the following errors:
>
> $ cd samples/bpf/
> $ make
>
> Auto-detecting system features:
> ...                        libelf: [ OFF ]
> ...                           bpf: [ OFF ]
>
> No libelf found
> Makefile:213: recipe for target 'elfdep' failed
> -----------
>
> I bissected it down to commit 5f9380572b4bb24f60cd492b1
>
> Author: Jakub Kicinski <jakub.kicinski@netronome.com>
> Date:   Thu May 10 10:24:39 2018 -0700
>
>     samples: bpf: compile and link against full libbpf
> ---------
>
> Checking out a kernel before this commit makes the samples build. Also I do
> have libelf on my system.
>
> Any thoughts on this issue?
>
> thank you,
>
> - Joel