[Bug target/106773] libbpf: failed to find BTF info for global/extern symbol 'bpf_link_fops'

[james.hilliard1 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106773

--- Comment #7 from James Hilliard <james.hilliard1 at gmail dot com> ---
There's also this error during skeleton generation for kfunc_call_test.c:
$ /home/buildroot/bpf-next/tools/testing/selftests/bpf/tools/sbin/bpftool
--debug gen skeleton
/home/buildroot/bpf-next/tools/testing/selftests/bpf/bpf_gcc/kfunc_call_test.bpf.linked3.o
name kfunc_call_test
libbpf: loading object 'kfunc_call_test' from buffer
libbpf: elf: section(2) .symtab, size 648, link 1, flags 0, type=2
libbpf: elf: section(3) .data, size 0, link 0, flags 3, type=1
libbpf: elf: skipping section(3) .data (size 0)
libbpf: elf: section(4) .bss, size 0, link 0, flags 3, type=8
libbpf: elf: section(5) tc, size 1120, link 0, flags 6, type=1
libbpf: sec 'tc': found program 'kfunc_call_test2' at insn offset 0 (0 bytes),
code size 13 insns (104 bytes)
libbpf: sec 'tc': found program 'kfunc_call_test1' at insn offset 13 (104
bytes), code size 21 insns (168 bytes)
libbpf: sec 'tc': found program 'kfunc_call_test_ref_btf_id' at insn offset 34
(272 bytes), code size 22 insns (176 bytes)
libbpf: sec 'tc': found program 'kfunc_call_test_pass' at insn offset 56 (448
bytes), code size 52 insns (416 bytes)
libbpf: sec 'tc': found program 'kfunc_call_test_get_mem' at insn offset 108
(864 bytes), code size 32 insns (256 bytes)
libbpf: elf: section(6) syscall, size 152, link 0, flags 6, type=1
libbpf: sec 'syscall': found program 'kfunc_syscall_test' at insn offset 0 (0
bytes), code size 15 insns (120 bytes)
libbpf: sec 'syscall': found program 'kfunc_syscall_test_null' at insn offset
15 (120 bytes), code size 4 insns (32 bytes)
libbpf: elf: section(7) license, size 4, link 0, flags 3, type=1
libbpf: license of kfunc_call_test is GPL
libbpf: elf: section(8) .comment, size 43, link 0, flags 30, type=1
libbpf: elf: skipping unrecognized data section(8) .comment
libbpf: elf: section(9) .reltc, size 272, link 2, flags 40, type=9
libbpf: elf: section(10) .relsyscall, size 64, link 2, flags 40, type=9
libbpf: elf: section(11) .BTF, size 467261, link 0, flags 0, type=1
libbpf: looking for externs among 27 symbols...
libbpf: failed to find BTF for extern 'bpf_kfunc_call_test2': -22
Error: failed to open BPF object file: Invalid argument