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Date:   Tue, 21 Jul 2020 07:24:20 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc:     Christoph Hellwig <hch@lst.de>, Shuah Khan <shuah@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>, bpf@vger.kernel.org
Subject: Re: BPF selftests build failures
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On Mon, Jul 20, 2020 at 01:41:52PM -0700, Alexei Starovoitov wrote:
> On Mon, Jul 20, 2020 at 10:09:43AM +0200, Christoph Hellwig wrote:
> > Hi BPF and selftest maintainers.  I get a very strange failure
> > when trying to build the bpf selftests on current net-next master:
> > 
> > hch@brick:~/work/linux/tools/testing/selftests/bpf$ make
> >   GEN      vmlinux.h
> > Error: failed to load BTF from /home/hch/work/linux/vmlinux: No such file or directory
> 
> That's bpftool complaining that BTF is not present in vmlinux.
> You need CONFIG_DEBUG_INFO_BTF=y and pahole >= v1.16
> You also need llvm 10 to build bpf progs.

That's not a very useful error message then.  Can you fix it to
tell people what is wrong?