perf build: Always disable stack protection for BPF skeleton objects

When the clang toolchain has stack protection enabled, the bpf
skeletons build fails with:

error: A call to built-in function '__stack_chk_fail' is not supported.

Since stack-protector makes no sense for the BPF bits, just unconditionally
disable it.

See also similar case at 878625e1c7a10dfbb1fdaaaae2c4d2a58fbce627

Signed-off-by: Federico Pellegrin <fede@evolware.org>
Link: https://lore.kernel.org/r/20250718041224.12389-1-fede@evolware.org
[ rearrange long lines ]
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 9b51593628c175182987291cbafdf69dfea310bc..e2150acc2c13325f93a2d5cd4a60b4a6bfeedc94 100644 (file)
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -1249,8 +1249,10 @@ else
        $(Q)cp "$(VMLINUX_H)" $@
 endif
 
-$(SKEL_TMP_OUT)/%.bpf.o: util/bpf_skel/%.bpf.c $(OUTPUT)PERF-VERSION-FILE util/bpf_skel/perf_version.h $(LIBBPF) $(SKEL_OUT)/vmlinux.h | $(SKEL_TMP_OUT)
-       $(QUIET_CLANG)$(CLANG) -g -O2 --target=bpf $(CLANG_OPTIONS) $(BPF_INCLUDE) $(TOOLS_UAPI_INCLUDE) \
+$(SKEL_TMP_OUT)/%.bpf.o: $(OUTPUT)PERF-VERSION-FILE util/bpf_skel/perf_version.h | $(SKEL_TMP_OUT)
+$(SKEL_TMP_OUT)/%.bpf.o: util/bpf_skel/%.bpf.c $(LIBBPF) $(SKEL_OUT)/vmlinux.h
+       $(QUIET_CLANG)$(CLANG) -g -O2 -fno-stack-protector --target=bpf \
+         $(CLANG_OPTIONS) $(BPF_INCLUDE) $(TOOLS_UAPI_INCLUDE) \
          -include $(OUTPUT)PERF-VERSION-FILE -include util/bpf_skel/perf_version.h \
          -c $(filter util/bpf_skel/%.bpf.c,$^) -o $@