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

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Message-ID: <CAJ+HfNgem7ijzQkz7BU-Z_A-CqWXY_uMF6_p0tGZ6eUMx_N3QQ@mail.gmail.com>
Date:   Wed, 2 Oct 2019 09:41:15 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     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 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