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

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Message-ID: <CAK7LNARd4_o4E=TSONZjJ9iyyeUE1=L_njU7LiEZFpNunSEEkw@mail.gmail.com>
Date:   Thu, 3 Oct 2019 19:36:47 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Björn Töpel <bjorn.topel@...il.com>
Cc:     Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        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, Oct 3, 2019 at 3:28 PM Björn Töpel <bjorn.topel@...il.com> wrote:
>
> 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=)?

No.
O= points to the output directory of vmlinux,
not of the external module.

You cannot put the build artifacts from samples/bpf/
in a separate directory.



> > >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



-- 
Best Regards
Masahiro Yamada