selftests/bpf: Skip callx switch table test for clang-22 with cpu=v4

clang-22 miscompiles call_by_switch() when targeting -mcpu=v4: it turns
the switch into an array of pointers to functions and then erroneously
removes the array in BPFAsmPrinter::doFinalization(), breaking the build
with:

  error: Undefined temporary symbol .Lswitch.table.call_by_switch

Fixed by llvm commit 9fc458a1d95b ("[BPF] Fix erroneous removal of
non-jump-table globals"), first released in clang-23; older clangs are
fine. test_progs-cpuv4 is built by default whenever clang supports v4,
so selftests/bpf fails to build with any clang-22 release. Guard just
this test with the compiler/cpu check and leave a __skip placeholder
for the broken combination, so the gap is reported as SKIP instead of
silently missing.

Fixes: b018e998e645 ("selftests/bpf: Add tests for callx through pointers in read-only data")
Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20260930020851.71691-1-ihor.solodrai@linux.dev

0 files changed, 0 insertions, 0 deletions