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

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Message-ID: <20181117050653.wgcv6u4hsqldgb22@mini-arch>
Date:   Fri, 16 Nov 2018 21:06:53 -0800
From:   Stanislav Fomichev <sdf@...ichev.me>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Stanislav Fomichev <sdf@...gle.com>, 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 11/16, Alexei Starovoitov wrote:
> 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.
My understanding was that you periodically merge whatever goes to Linus
back to bpf-next, so my plan was to wait for that event and propose a
v3.

> > 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.
Sure, that's no problem. I'll follow up with another patch whenever that
happens.

> pls don't top post.
Sorry, Gmail :-/

> > 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
> > >