[PATCH] bpftool: build bpf bits with -std=gnu11

[Holger Hoffstätte]

A gcc-15-based bpf toolchain defaults to C23 and fails to compile various
kernel headers due to their use of a custom 'bool' type.
Explicitly using -std=gnu11 works with both clang and bpf-toolchain.

Signed-off-by: Holger Hoffstätte <holger@xxxxxxxxxxxxxxxxxxxxxx>
---
 tools/bpf/bpftool/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
index 9e9a5f006..ca6c1e04b 100644
--- a/tools/bpf/bpftool/Makefile
+++ b/tools/bpf/bpftool/Makefile
@@ -227,7 +227,7 @@ $(OUTPUT)%.bpf.o: skeleton/%.bpf.c $(OUTPUT)vmlinux.h $(LIBBPF_BOOTSTRAP)
 		-I$(or $(OUTPUT),.) \
 		-I$(srctree)/tools/include/uapi/ \
 		-I$(LIBBPF_BOOTSTRAP_INCLUDE) \
-		-g -O2 -Wall -fno-stack-protector \
+		-g -O2 -Wall -fno-stack-protector -std=gnu11 \
 		--target=bpf -c $< -o $@
 	$(Q)$(LLVM_STRIP) -g $@
 
-- 
2.49.0