On Wed, Oct 28, 2020 at 7:06 PM Hangbin Liu [off-list ref] wrote:

On Wed, Oct 28, 2020 at 05:02:34PM -0600, David Ahern wrote:

quoted

fails to compile on Ubuntu 20.10:

root@u2010-sfo3:~/iproute2.git# ./configure
TC schedulers
 ATM  yes
 IPT  using xtables
 IPSET  yes

iptables modules directory: /usr/lib/x86_64-linux-gnu/xtables
libc has setns: yes
SELinux support: yes
libbpf support: yes
ELF support: yes
libmnl support: yes
Berkeley DB: no
need for strlcpy: yes
libcap support: yes

root@u2010-sfo3:~/iproute2.git# make clean

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.

Why not using libbpf from submodule?

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.

Thanks
Hangbin