netdev - Re: [PATCHv3 iproute2-next 1/5] configure: add check

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Date:   Mon, 2 Nov 2020 08:37:37 -0700
From:   David Ahern <dsahern@...il.com>
To:     Hangbin Liu <haliu@...hat.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>
Cc:     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: [PATCHv3 iproute2-next 1/5] configure: add check_libbpf() for
 later libbpf support

On 10/29/20 9:11 AM, Hangbin Liu wrote:
> This patch adds a check to see if we support libbpf. By default the
> system libbpf will be used, but static linking against a custom libbpf
> version can be achieved by passing LIBBPF_DIR to configure. FORCE_LIBBPF
> can be set to force configure to abort if no suitable libbpf is found,
> which is useful for automatic packaging that wants to enforce the
> dependency.
> 

Add an option to force libbpf off and use of the legacy code. i.e, yes
it is installed, but don't use it.

configure script really needs a usage to dump options like disabling libbpf.