On Wed, Oct 28, 2020 at 08:20:55PM -0600, David Ahern wrote:

quoted

quoted

root@u2010-sfo3:~/iproute2.git# make -j 4
...
/usr/bin/ld: ../lib/libutil.a(bpf_libbpf.o): in function `load_bpf_object':
bpf_libbpf.c:(.text+0x3cb): undefined reference to
`bpf_program__section_name'
/usr/bin/ld: bpf_libbpf.c:(.text+0x438): undefined reference to
`bpf_program__section_name'
/usr/bin/ld: bpf_libbpf.c:(.text+0x716): undefined reference to
`bpf_program__section_name'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:27: ip] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:64: all] Error 2

You need to update libbpf to latest version.

nope. you need to be able to handle this. Ubuntu 20.10 was just
released, and it has a version of libbpf. If you are going to integrate
libbpf into other packages like iproute2, it needs to just work with
that version.

OK, I can replace bpf_program__section_name by bpf_program__title().

quoted

But this also remind me that I need to add bpf_program__section_name() to
configure checking. I will see if I missed other functions' checking.

This is going to be an on-going problem. iproute2 should work with
whatever version of libbpf is installed on that system.

I will make it works on Ubuntu 20.10, but with whatever version of libbpf?
That looks hard, especially with old libbpf.

Thanks
Hangbin