From: Namhyung Kim <namhyung@kernel.org>
Date: Mon, 4 May 2026 06:27:57 +0000 (-0700)
Subject: perf build: Add -fms-extensions for GEN_VMLINUX_H=1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=53bc032892782e54f33dfe18b86c461492a55fa4;p=thirdparty%2Fkernel%2Fstable.git

perf build: Add -fms-extensions for GEN_VMLINUX_H=1

On my system, `make GEN_VMLINUX_H=1` fails with a lot of error messages
like below:

  ./util/bpf_skel/vmlinux.h:134488:4: error: declaration does not declare anything [-Werror,-Wmissing-declarations]
   134488 |                         struct freelist_counters;
          |                         ^~~~~~~~~~~~~~~~~~~~~~~~
  make[2]: *** [Makefile.perf:1249: linux/tools/perf/util/bpf_skel/.tmp/lock_contention.bpf.o] Error 1

I saw commit 835a50753579a ("selftests/bpf: Add -fms-extensions to bpf
build flags") also added the same flags to bpf programs.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index cee19c923c06..0aba14f22a06 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -1249,6 +1249,7 @@ $(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) $(EXTRA_BPF_FLAGS) $(BPF_INCLUDE) $(TOOLS_UAPI_INCLUDE) \
 	  -include $(OUTPUT)PERF-VERSION-FILE -include util/bpf_skel/perf_version.h \
+	  -fms-extensions -Wno-microsoft-anon-tag \
 	  -c $(filter util/bpf_skel/%.bpf.c,$^) -o $@
 
 $(SKEL_OUT)/%.skel.h: $(SKEL_TMP_OUT)/%.bpf.o | $(BPFTOOL)