On Mon, Jul 20, 2020 at 01:41:52PM -0700, Alexei Starovoitov wrote: > On Mon, Jul 20, 2020 at 10:09:43AM +0200, Christoph Hellwig wrote: > > Hi BPF and selftest maintainers. I get a very strange failure > > when trying to build the bpf selftests on current net-next master: > > > > hch@brick:~/work/linux/tools/testing/selftests/bpf$ make > > GEN vmlinux.h > > Error: failed to load BTF from /home/hch/work/linux/vmlinux: No such file or directory > > That's bpftool complaining that BTF is not present in vmlinux. > You need CONFIG_DEBUG_INFO_BTF=y and pahole >= v1.16 > You also need llvm 10 to build bpf progs. Oh well, after the non-obvious enabling of CONFIG_DEBUG_INFO_BTF I did run into the too old clang (clang 9) as well, which just creates random errors instead of warning about a too old compiler, sight. Then I installed clang-10, but there still seem to be various failures in the net-next baseline, and the setsockopt code I'm trying to test doesn't even get exercised from sticking a printk in there. That is not a great testcase experience..
