Comment 3 for bug 2028932

This is failing with Lunar + 6.5-rc3 (clang-15, llvm-15, gcc-12), as well:

  CLNG-BPF [test_maps] test_check_mtu.bpf.o
  CLNG-BPF [test_maps] test_cls_redirect.bpf.o
progs/test_cls_redirect.c:90:2: error: static assertion expression is not an integral constant expression
        sizeof(flow_ports_t) !=
        ^~~~~~~~~~~~~~~~~~~~~~~
progs/test_cls_redirect.c:91:3: note: cast that performs the conversions of a reinterpret_cast is not allowed in a constant expression
                offsetofend(struct bpf_sock_tuple, ipv4.dport) -
                ^
progs/test_cls_redirect.c:32:3: note: expanded from macro 'offsetofend'
        (offsetof(TYPE, MEMBER) + sizeof((((TYPE *)0)->MEMBER)))
         ^
/home/ubuntu/mainline-crack/tools/testing/selftests/bpf/tools/include/bpf/bpf_helpers.h:86:33: note: expanded from macro 'offsetof'
#define offsetof(type, member) ((unsigned long)&((type *)0)->member)
                                 ^
progs/test_cls_redirect.c:95:2: error: static assertion expression is not an integral constant expression
        sizeof(flow_ports_t) !=
        ^~~~~~~~~~~~~~~~~~~~~~~
progs/test_cls_redirect.c:96:3: note: cast that performs the conversions of a reinterpret_cast is not allowed in a constant expression
                offsetofend(struct bpf_sock_tuple, ipv6.dport) -
                ^
progs/test_cls_redirect.c:32:3: note: expanded from macro 'offsetofend'
        (offsetof(TYPE, MEMBER) + sizeof((((TYPE *)0)->MEMBER)))
         ^
/home/ubuntu/mainline-crack/tools/testing/selftests/bpf/tools/include/bpf/bpf_helpers.h:86:33: note: expanded from macro 'offsetof'
#define offsetof(type, member) ((unsigned long)&((type *)0)->member)
                                 ^
2 errors generated.
make[1]: *** [Makefile:576: /home/ubuntu/mainline-crack/tools/testing/selftests/bpf/test_cls_redirect.bpf.o] Error 1
make[1]: Leaving directory '/home/ubuntu/mainline-crack/tools/testing/selftests/bpf'
make: *** [Makefile:169: all] Error 2
make: Leaving directory '/home/ubuntu/mainline-crack/tools/testing/selftests'

ubuntu@autovm4:~/mainline-crack$ git log --oneline
a941e05c6 (grafted, HEAD, tag: cod/mainline/v6.5-rc3) debian changelog