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Subject[PATCHv4 0/6] perf/bpftool: Allow to link libbpf dynamically
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 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.

Also available in:

v4 changes:
- based on Toke's v3 post, there's no need for additional API exports:

Since bpftool uses bits of libbpf that are not exported as public API in
the .so version, we also pass in libbpf.a to the linker, which allows it to
pick up the private functions from the static library without having to
expose them as ABI.

- changing some Makefile variable names
- documenting LIBBPF_DYNAMIC and LIBBPF_DIR in the Makefile comment
- extending with libbpf dynamic link


Jiri Olsa (6):
perf tools: Allow to specify libbpf install directory
bpftool: Allow to link libbpf dynamically
bpftool: Rename BPF_DIR Makefile variable to LIBBPF_SRC_DIR
bpftool: Rename LIBBPF_OUTPUT Makefile variable to LIBBPF_BUILD_OUTPUT
bpftool: Rename LIBBPF_PATH Makefile variable to LIBBPF_BUILD_PATH
selftests, bpftool: Add build test for libbpf dynamic linking

tools/bpf/bpftool/Makefile | 54 ++++++++++++++++++++++++++++++++++++++++++++++--------
tools/perf/Makefile.config | 27 ++++++++++++++++++++-------
tools/testing/selftests/bpf/ | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 119 insertions(+), 15 deletions(-)

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