linux-kernel - Re: perf build broken looking for bpf/{libbpf,bpf}.h after merge with upstream

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Date:   Thu, 4 Nov 2021 17:42:38 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Song Liu <songliubraving@...com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Jiri Olsa <jolsa@...nel.org>, bpf <bpf@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: perf build broken looking for bpf/{libbpf,bpf}.h after merge
 with upstream

Em Thu, Nov 04, 2021 at 01:33:20PM -0700, Namhyung Kim escreveu:
> On Thu, Nov 4, 2021 at 11:13 AM Song Liu <songliubraving@...com> wrote:
> > > On Nov 4, 2021, at 11:11 AM, Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> > > Em Thu, Nov 04, 2021 at 10:56:26AM -0700, Andrii Nakryiko escreveu:
> > >> On the side note, why BUILD_BPF_SKEL=1 is not a default, we might have
> > >> caught this sooner. Is there any reason not to flip the default?

> > > I asked Song in the past about this, and asked again on another reply to
> > > this thread, I think it should be the default.

> > > Song, Namhyung? You're the skel guys (so far) :-)

> > Yeah, let's make it default.
 
> Then it'd require 'clang' for the perf build.  Maybe we can check
> the availability of the compiler and disable it back if not.

Right, an extra feature check.

- Arnaldo