netdev - Re: [PATCH bpf-next v2] bpftool: make libbfd optional

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Date:   Fri, 16 Nov 2018 20:57:14 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        jakub.kicinski@...ronome.com, quentin.monnet@...ronome.com
Subject: Re: [PATCH bpf-next v2] bpftool: make libbfd optional

On Fri, Nov 16, 2018 at 08:52:23PM -0800, Stanislav Fomichev wrote:
> I actually wanted to follow up with a v2 when
> https://lkml.org/lkml/2018/11/16/243 reaches bpf-next (I got an ack
> already).

it will go via perf tree, so not related.

> Alternatively, I can follow up with another patch on top of that to fix
> libbfd feature detection (it's semi broken on ubuntu/fedora now).

I think you'd need to wait until all trees merge.

pls don't top post.

> On Fri, Nov 16, 2018 at 8:47 PM Alexei Starovoitov <
> alexei.starovoitov@...il.com> wrote:
> 
> > On Mon, Nov 12, 2018 at 1:44 PM Stanislav Fomichev <sdf@...gle.com> wrote:
> > >
> > > Make it possible to build bpftool without libbfd. libbfd and libopcodes
> > are
> > > typically provided in dev/dbg packages (binutils-dev in debian) which we
> > > usually don't have installed on the fleet machines and we'd like a way
> > to have
> > > bpftool version that works without installing any additional packages.
> > > This excludes support for disassembling jit-ted code and prints an error
> > if
> > > the user tries to use these features.
> > >
> > > Tested by:
> > > cat > FEATURES_DUMP.bpftool <<EOF
> > > feature-libbfd=0
> > > feature-disassembler-four-args=1
> > > feature-reallocarray=0
> > > feature-libelf=1
> > > feature-libelf-mmap=1
> > > feature-bpf=1
> > > EOF
> > > FEATURES_DUMP=$PWD/FEATURES_DUMP.bpftool make
> > > ldd bpftool | grep libbfd
> > >
> > > Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> >
> > applied, thanks
> >