netdev - Re: [PATCH bpf] samples/bpf: kbuild: add CONFIG_SAMPLE

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Date:   Thu, 3 Oct 2019 08:28:14 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Björn Töpel <bjorn.topel@...el.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf] samples/bpf: kbuild: add CONFIG_SAMPLE_BPF Kconfig

On Thu, 3 Oct 2019 at 01:14, Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org> wrote:
>
> On Wed, Oct 02, 2019 at 09:41:15AM +0200, Björn Töpel wrote:
> >On Wed, 2 Oct 2019 at 03:49, Masahiro Yamada
> ><yamada.masahiro@...ionext.com> wrote:
> >>
> >[...]
> >> > Yes, the BPF samples require clang/LLVM with BPF support to build. Any
> >> > suggestion on a good way to address this (missing tools), better than
> >> > the warning above? After the commit 394053f4a4b3 ("kbuild: make single
> >> > targets work more correctly"), it's no longer possible to build
> >> > samples/bpf without support in the samples/Makefile.
> >>
> >>
> >> You can with
> >>
> >> "make M=samples/bpf"
> >>
> >
> >Oh, I didn't know that. Does M= support "output" builds (O=)?
> >
> >I usually just build samples/bpf/ with:
> >
> >  $ make V=1 O=/home/foo/build/bleh samples/bpf/
> >
> >
> >Björn
>
> Shouldn't README be updated?
>

Hmm, the M= variant doesn't work at all for me. The build is still
broken for me. Maybe I'm missing anything obvious...


> --
> Regards,
> Ivan Khoronzhuk