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

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Message-ID: <20250502085710.3980-1-holger@applied-asynchrony.com>
Date: Fri,  2 May 2025 10:57:10 +0200
From: Holger Hoffstätte <holger@...lied-asynchrony.com>
To: Quentin Monnet <qmo@...nel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Holger Hoffstätte <holger@...lied-asynchrony.com>
Subject: [PATCH] bpftool: build bpf bits with -std=gnu11

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@...lied-asynchrony.com>
---
 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