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 10:56:26 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Song Liu <songliubraving@...com>, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...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

On Thu, Nov 4, 2021 at 10:49 AM Arnaldo Carvalho de Melo
<arnaldo.melo@...il.com> wrote:
>
> Em Thu, Nov 04, 2021 at 02:37:57PM -0300, Arnaldo Carvalho de Melo escreveu:
> >
> > Hi Song,
> >
> >       I just did a merge with upstream and I'm getting this:
> >
> >   LINK    /tmp/build/perf/plugins/plugin_scsi.so
> >   INSTALL trace_plugins
>
> To clarify, the command line to build perf that results in this problem
> is:
>
>   make -k BUILD_BPF_SKEL=1 CORESIGHT=1 PYTHON=python3 O=/tmp/build/perf -C tools/perf install-bin

Oh, I dropped CORESIGN and left BUILD_BPF_SKEL=1 and yeah, I see the
build failure. I do think now that it's related to the recent Makefile
revamp effort. Quentin, PTAL.

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?

>
> > Auto-detecting system features:
> > ...                        libbfd: [ on  ]
> > ...        disassembler-four-args: [ on  ]
> > ...                          zlib: [ on  ]
> > ...                        libcap: [ on  ]
> > ...               clang-bpf-co-re: [ on  ]
> >
> >

[...]