[Buildroot] [PATCH] package/linux-tools: perf: explicitly disable BPF skeletons

[Buildroot] [PATCH] package/linux-tools: perf: explicitly disable BPF skeletons

[Yegor Yefremov via buildroot]

From: Yegor Yefremov <yegorslists@googlemail.com>

perf builds its BPF skeletons by default whenever libelf, zlib, libbpf
and openssl support are enabled and a clang >= 12.0.1 is found in the
PATH. That clang is the host's one, and it compiles the BPF programs
against the host's system headers, so the build fails (here with
linux 7.2.6 on ARM and Ubuntu's clang 21.1.8):

/usr/include/linux/ioctl.h:5:10: fatal error: 'asm/ioctl.h' file not found
make[6]: *** [.../tools/perf/bpf_skel.mak:87: .../tools/perf/util/bpf_skel/.tmp/bpf_prog_profiler.bpf.o] Error 1

Without clang on the host, perf silently disables them, so whether the
build works depends on the build machine.

The perf tool does not depend on host-clang, so always pass
BUILD_BPF_SKEL=0 rather than let the host's clang be picked up.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
---
 package/linux-tools/linux-tool-perf.mk.in | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/package/linux-tools/linux-tool-perf.mk.in b/package/linux-tools/linux-tool-perf.mk.in
index 3271fd5683..45bb2bd7a3 100644
--- a/package/linux-tools/linux-tool-perf.mk.in
+++ b/package/linux-tools/linux-tool-perf.mk.in
@@ -30,7 +30,8 @@ PERF_MAKE_FLAGS = \
 	NO_LIBPYTHON=1 \
 	NO_LIBBIONIC=1 \
 	NO_RUST=1 \
-	NO_SHELLCHECK=1
+	NO_SHELLCHECK=1 \
+	BUILD_BPF_SKEL=0
 
 # We need to pass an argument to ld for setting the emulation when
 # building for MIPS architecture, otherwise the default one will always
-- 
2.55.0

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Re: [Buildroot] [PATCH] package/linux-tools: perf: explicitly disable BPF skeletons

[Thomas Petazzoni via buildroot]

On Fri, Oct 30, 2026 at 11:26:48PM +0100, Yegor Yefremov via buildroot wrote:
> From: Yegor Yefremov <yegorslists@googlemail.com>
> 
> perf builds its BPF skeletons by default whenever libelf, zlib, libbpf
> and openssl support are enabled and a clang >= 12.0.1 is found in the
> PATH. That clang is the host's one, and it compiles the BPF programs
> against the host's system headers, so the build fails (here with
> linux 7.2.6 on ARM and Ubuntu's clang 21.1.8):
> 
> /usr/include/linux/ioctl.h:5:10: fatal error: 'asm/ioctl.h' file not found
> make[6]: *** [.../tools/perf/bpf_skel.mak:87: .../tools/perf/util/bpf_skel/.tmp/bpf_prog_profiler.bpf.o] Error 1
> 
> Without clang on the host, perf silently disables them, so whether the
> build works depends on the build machine.
> 
> The perf tool does not depend on host-clang, so always pass
> BUILD_BPF_SKEL=0 rather than let the host's clang be picked up.
> 
> Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>

Applied to master, thanks!

Best regards,

Thomas Petazzoni
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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