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From: "Björn Töpel" <bjorn.topel@gmail.com>
To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: "Ivan Khoronzhuk" <ivan.khoronzhuk@linaro.org>,
	Networking <netdev@vger.kernel.org>,
	"Alexei Starovoitov" <ast@kernel.org>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	"Björn Töpel" <bjorn.topel@intel.com>,
	"Linux Kbuild mailing list" <linux-kbuild@vger.kernel.org>,
	bpf <bpf@vger.kernel.org>
Subject: Re: [PATCH bpf] samples/bpf: kbuild: add CONFIG_SAMPLE_BPF Kconfig
Date: Thu, 3 Oct 2019 12:50:23 +0200	[thread overview]
Message-ID: <CAJ+HfNhx+gQmRMb18UDRrmzciDYUbdezUh9bRhWG8_HTUCLk9w@mail.gmail.com> (raw)
In-Reply-To: <CAK7LNARd4_o4E=TSONZjJ9iyyeUE1=L_njU7LiEZFpNunSEEkw@mail.gmail.com>

On Thu, 3 Oct 2019 at 12:37, Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
>
> On Thu, Oct 3, 2019 at 3:28 PM Björn Töpel <bjorn.topel@gmail.com> wrote:
> >
> > On Thu, 3 Oct 2019 at 01:14, Ivan Khoronzhuk <ivan.khoronzhuk@linaro.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@socionext.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.
>

Hmm, I can't even get "make M=samples/bpf/" to build. Am I missing
something obvious?

Prior 394053f4a4b3 "make samples/bpf/" and "make O=/foo/bar
samples/bpf/" worked, but I guess I can live with that...


Thanks!
Björn


>
>
> > > >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

  reply	other threads:[~2019-10-03 10:50 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-01 10:14 [PATCH bpf] samples/bpf: kbuild: add CONFIG_SAMPLE_BPF Kconfig Björn Töpel
2019-10-01 10:17 ` Björn Töpel
2019-10-01 12:33 ` Masahiro Yamada
2019-10-01 14:16   ` Björn Töpel
2019-10-02  1:48     ` Masahiro Yamada
2019-10-02  7:41       ` Björn Töpel
2019-10-02 23:14         ` Ivan Khoronzhuk
2019-10-03  6:28           ` Björn Töpel
2019-10-03 10:36             ` Masahiro Yamada
2019-10-03 10:50               ` Björn Töpel [this message]
2019-10-03 17:16                 ` Andrii Nakryiko
2019-10-03 17:37                   ` Björn Töpel

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