selftests/bpf: Add -fms-extensions to bpf build flags

Alexei Starovoitov · Alexei Starovoitov · commit 835a50753579 · 2025-12-03T20:20:11.000-08:00
The kernel is now built with -fms-extensions, therefore
generated vmlinux.h contains types like:
struct slab {
   ..
   struct freelist_counters;
};

Use -fms-extensions and -Wno-microsoft-anon-tag flags
to build bpf programs that #include "vmlinux.h"

Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
@@ -437,6 +437,8 @@ BPF_CFLAGS = -g -Wall -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN)	\
 	     -I$(abspath $(OUTPUT)/../usr/include)			\
 	     -std=gnu11		 					\
 	     -fno-strict-aliasing 					\
+	     -Wno-microsoft-anon-tag					\
+	     -fms-extensions						\
 	     -Wno-compare-distinct-pointer-types			\
 	     -Wno-initializer-overrides					\
 	     #

Original file line number	Diff line number	Diff line change
`@@ -437,6 +437,8 @@ BPF_CFLAGS = -g -Wall -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) \`
`437`	`437`	`-I$(abspath $(OUTPUT)/../usr/include) \`
`438`	`438`	`-std=gnu11 \`
`439`	`439`	`-fno-strict-aliasing \`
	`440`	`+ -Wno-microsoft-anon-tag \`
	`441`	`+ -fms-extensions \`
`440`	`442`	`-Wno-compare-distinct-pointer-types \`
`441`	`443`	`-Wno-initializer-overrides \`
`442`	`444`	`#`