Re: [PATCH v3 bpf-next 5/7] libbpf: move bpf_{helpers,endian,tracing}.h into libbpf

On 10/3/19 3:28 PM, Andrii Nakryiko wrote:

Move bpf_helpers.h, bpf_tracing.h, and bpf_endian.h into libbpf. Ensure
they are installed along the other libbpf headers. Also, adjust
selftests and samples include path to include libbpf now.

There are side effects to bringing bpf_helpers.h into libbpf if this
gets propagated to the github sync.

bpf_helpers.h references BPF_FUNC_* which are defined in the
uapi/linux/bpf.h header. That is a kernel version dependent api file
which means attempts to use newer libbpf with older kernel headers is
going to throw errors when compiling bpf programs -- bpf_helpers.h will
contain undefined BPF_FUNC references.