Hi,
I cloned the bpf-next and tried to compile the bpf selftest.
first I got error
"
CC /usr/src/bpf
next/tools/testing/selftests/bpf/tools/build/bpftool/xlated_dumper.o
make[1]: *** No rule to make target
'/usr/src/bpf-next/tools/include/asm-generic/bitops/find.h', needed by
'/usr/src/bpf-next/tools/testing/selftests/bpf/tools/build/bpftool/btf_dumper.o'.
Stop.
I could not find find.h in
/usr/src/bpf-next/tools/include/asm-generic/bitops/find.h but I found
it in /usr/src/bpf-next/tools/include/linux/find.h, copied it to
/usr/src/bpf-next/tools/include/asm-generic/bitops, seems resolved the
problem,
then I got another error below,
CLNG-BPF [test_maps] map_kptr.o
progs/map_kptr.c:7:29: error: unknown attribute 'btf_type_tag' ignored
[-Werror,-Wunknown-attributes]
struct prog_test_ref_kfunc __kptr *unref_ptr;
^~~~~~
/usr/src/bpf-next/tools/testing/selftests/bpf/tools/include/bpf/bpf_helpers.h:176:31:
note: expanded from macro '__kptr'
#define __kptr __attribute__((btf_type_tag("kptr")))
^~~~~~~~~~~~~~~~~~~~
progs/map_kptr.c:8:29: error: unknown attribute 'btf_type_tag' ignored
[-Werror,-Wunknown-attributes]
struct prog_test_ref_kfunc __kptr_ref *ref_ptr;
^~~~~~~~~~
/usr/src/bpf-next/tools/testing/selftests/bpf/tools/include/bpf/bpf_helpers.h:177:35:
note: expanded from macro '__kptr_ref'
#define __kptr_ref __attribute__((btf_type_tag("kptr_ref")))
"
my clang is 12.0.1 and installed new clang from llvm github repository
clang version 15.0.0 (https://github.com/llvm/llvm-project.git
e91a73de24d60954700d7ac0293c050ab2cbe90b)
it resolved the problem, but now I got error
GEN-SKEL [test_progs] test_bpf_nf.skel.h
libbpf: failed to find BTF info for global/extern symbol 'bpf_skb_ct_lookup'
Error: failed to link
'/usr/src/bpf-next/tools/testing/selftests/bpf/test_bpf_nf.o': Unknown
error -2 (-2)
make: *** [Makefile:508:
/usr/src/bpf-next/tools/testing/selftests/bpf/test_bpf_nf.skel.h]
Error 254
running out of ideas on how to fix the compiling error. I hope I am
not doing something wrong :)
