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SubjectRe: [PATCH 0/3] perf/bpftool: Allow to link libbpf dynamically
Alexei Starovoitov <> writes:

> On Wed, Nov 27, 2019 at 1:48 AM Jiri Olsa <> wrote:
>> hi,
>> adding support to link bpftool with libbpf dynamically,
>> and config change for perf.
>> It's now possible to use:
>> $ make -C tools/bpf/bpftool/ LIBBPF_DYNAMIC=1
>> which will detect libbpf devel package with needed version,
>> and if found, link it with bpftool.
>> It's possible to use arbitrary installed libbpf:
>> $ make -C tools/bpf/bpftool/ LIBBPF_DYNAMIC=1 LIBBPF_DIR=/tmp/libbpf/
>> I based this change on top of Arnaldo's perf/core, because
>> it contains libbpf feature detection code as dependency.
>> It's now also synced with latest bpf-next, so Toke's change
>> applies correctly.
> I don't like it.
> Especially Toke's patch to expose netlink as public and stable libbpf
> api.

Figured you might say that :)

> bpftools needs to stay tightly coupled with libbpf (and statically
> linked for that reason).
> Otherwise libbpf will grow a ton of public api that would have to be stable
> and will quickly become a burden.

I can see why you don't want to expose the "internal" functions as
LIBBPF_API. Doesn't *have* to mean we can't link bpftool dynamically
against the .so version of libbpf, though; will see if I can figure out
a clean way to do that...


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