netdev - Re: linux-next: build failure after merge of the bpf-next tree

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Date:   Mon, 24 Aug 2020 18:25:44 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Networking <netdev@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Miller <davem@...emloft.net>
Subject: Re: linux-next: build failure after merge of the bpf-next tree

On Mon, Aug 24, 2020 at 6:20 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
>
> On Fri, 21 Aug 2020 11:11:11 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> >
> > Hi all,
> >
> > After merging the bpf-next tree, today's linux-next build (x86_64
> > allmodconfig) failed like this:
> >
> > Auto-detecting system features:
> > ...                        libelf: [  [31mOFF [m ]
> > ...                          zlib: [  [31mOFF [m ]
> > ...                           bpf: [  [32mon [m  ]
> >
> > No libelf found
> > make[5]: *** [Makefile:284: elfdep] Error 1
> >
> > Caused by commit
> >
> >   d71fa5c9763c ("bpf: Add kernel module with user mode driver that populates bpffs.")
> >
> > [For a start, can we please *not* add this verbose feature detection
> > output to the nrormal build?]
> >
> > This is a PowerPC hosted cross build.
> >
> > I have marked BPF_PRELOAD as BROKEN for now.
>
> Still getting this failure ...

I don't have powerpc with crosscompiler to x86 to reproduce.
What exactly the error?
bpf_preload has:
"depends on CC_CAN_LINK"
which is exactly the same as bpfilter.
You should have seen this issue with bpfilter for years now.