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Message-ID: <20250401182347.3422199-2-irogers@google.com>
Date: Tue,  1 Apr 2025 11:22:59 -0700
From: Ian Rogers <irogers@...gle.com>
To: Yury Norov <yury.norov@...il.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Darren Hart <dvhart@...radead.org>, Davidlohr Bueso <dave@...olabs.net>, 
	"André Almeida" <andrealmeid@...lia.com>, John Garry <john.g.garry@...cle.com>, 
	Will Deacon <will@...nel.org>, James Clark <james.clark@...aro.org>, 
	Mike Leach <mike.leach@...aro.org>, Leo Yan <leo.yan@...ux.dev>, 
	Yicong Yang <yangyicong@...ilicon.com>, Jonathan Cameron <jonathan.cameron@...wei.com>, 
	Nathan Chancellor <nathan@...nel.org>, Bill Wendling <morbo@...gle.com>, 
	Justin Stitt <justinstitt@...gle.com>, Josh Poimboeuf <jpoimboe@...nel.org>, 
	Al Viro <viro@...iv.linux.org.uk>, Kyle Meyer <kyle.meyer@....com>, 
	Ben Gainey <ben.gainey@....com>, Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, 
	Kajol Jain <kjain@...ux.ibm.com>, Aditya Gupta <adityag@...ux.ibm.com>, 
	Eder Zulian <ezulian@...hat.com>, Dapeng Mi <dapeng1.mi@...ux.intel.com>, 
	Kuan-Wei Chiu <visitorckw@...il.com>, He Zhe <zhe.he@...driver.com>, 
	Dirk Gouders <dirk@...ders.net>, Brian Geffon <bgeffon@...gle.com>, 
	Ravi Bangoria <ravi.bangoria@....com>, Howard Chu <howardchu95@...il.com>, 
	Charlie Jenkins <charlie@...osinc.com>, Colin Ian King <colin.i.king@...il.com>, 
	Dominique Martinet <asmadeus@...ewreck.org>, Jann Horn <jannh@...gle.com>, 
	Masahiro Yamada <masahiroy@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
	Yang Jihong <yangjihong@...edance.com>, Dmitry Vyukov <dvyukov@...gle.com>, 
	Andi Kleen <ak@...ux.intel.com>, Graham Woodward <graham.woodward@....com>, 
	Ilkka Koskinen <ilkka@...amperecomputing.com>, 
	Anshuman Khandual <anshuman.khandual@....com>, Zhongqiu Han <quic_zhonhan@...cinc.com>, 
	Hao Ge <gehao@...inos.cn>, Tengda Wu <wutengda@...weicloud.com>, 
	Gabriele Monaco <gmonaco@...hat.com>, Chun-Tse Shao <ctshao@...gle.com>, 
	Casey Chen <cachen@...estorage.com>, "Dr. David Alan Gilbert" <linux@...blig.org>, 
	Li Huafei <lihuafei1@...wei.com>, "Steinar H. Gunderson" <sesse@...gle.com>, Levi Yun <yeoreum.yun@....com>, 
	Weilin Wang <weilin.wang@...el.com>, Thomas Falcon <thomas.falcon@...el.com>, 
	Thomas Richter <tmricht@...ux.ibm.com>, Andrew Kreimer <algonell@...il.com>, 
	"Krzysztof Łopatowski" <krzysztof.m.lopatowski@...il.com>, 
	Christophe Leroy <christophe.leroy@...roup.eu>, 
	Jean-Philippe Romain <jean-philippe.romain@...s.st.com>, Junhao He <hejunhao3@...wei.com>, 
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>, Xu Yang <xu.yang_2@....com>, 
	Steve Clevenger <scclevenger@...amperecomputing.com>, Zixian Cai <fzczx123@...il.com>, 
	Stephen Brennan <stephen.s.brennan@...cle.com>, Yujie Liu <yujie.liu@...el.com>, 
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, llvm@...ts.linux.dev
Subject: [PATCH v1 01/48] perf build: Avoid building libbpf/bpftool with LIBBPF_DYNAMIC

Building with LIBBPF_DYNAMIC still requires building libbpf as part of
bpftool, but the build also still accidentally builds it. Make the
parts of the build bringing in libbpf conditional. Don't build bpftool
is a bpftool exists from the which command.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/Makefile.perf | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index d335151736ed..c836e01c8279 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -1001,10 +1001,12 @@ $(LIBAPI)-clean:
 	$(call QUIET_CLEAN, libapi)
 	$(Q)$(RM) -r -- $(LIBAPI_OUTPUT)
 
+ifndef LIBBPF_DYNAMIC
 $(LIBBPF): FORCE | $(LIBBPF_OUTPUT)
 	$(Q)$(MAKE) -C $(LIBBPF_DIR) FEATURES_DUMP=$(FEATURE_DUMP_EXPORT) \
 		O= OUTPUT=$(LIBBPF_OUTPUT)/ DESTDIR=$(LIBBPF_DESTDIR) prefix= subdir= \
 		EXTRA_CFLAGS="-fPIC" $@ install_headers
+endif
 
 $(LIBBPF)-clean:
 	$(call QUIET_CLEAN, libbpf)
@@ -1224,7 +1226,11 @@ $(SKEL_TMP_OUT) $(LIBAPI_OUTPUT) $(LIBBPF_OUTPUT) $(LIBPERF_OUTPUT) $(LIBSUBCMD_
 	$(Q)$(MKDIR) -p $@
 
 ifeq ($(CONFIG_PERF_BPF_SKEL),y)
+BPFTOOL := $(shell which bpftool)
+ifeq ($(BPFTOOL),)
 BPFTOOL := $(SKEL_TMP_OUT)/bootstrap/bpftool
+BUILD_BPFTOOL := y
+endif
 # Get Clang's default includes on this system, as opposed to those seen by
 # '--target=bpf'. This fixes "missing" files on some architectures/distros,
 # such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
@@ -1243,16 +1249,21 @@ endif
 
 CLANG_OPTIONS = -Wall
 CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))
-BPF_INCLUDE := -I$(SKEL_TMP_OUT)/.. -I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES)
+BPF_INCLUDE := -I$(SKEL_TMP_OUT)/.. $(CLANG_SYS_INCLUDES)
+ifneq ($(LIBBPF_INCLUDE),)
+  BPF_INCLUDE += -I$(LIBBPF_INCLUDE)
+endif
 TOOLS_UAPI_INCLUDE := -I$(srctree)/tools/include/uapi
 
 ifneq ($(WERROR),0)
   CLANG_OPTIONS += -Werror
 endif
 
+ifneq ($(BUILD_BPFTOOL),)
 $(BPFTOOL): | $(SKEL_TMP_OUT)
 	$(Q)CFLAGS= $(MAKE) -C ../bpf/bpftool \
 		OUTPUT=$(SKEL_TMP_OUT)/ bootstrap
+endif
 
 # Paths to search for a kernel to generate vmlinux.h from.
 VMLINUX_BTF_ELF_PATHS ?= $(if $(O),$(O)/vmlinux)			\
-- 
2.49.0.504.g3bcea36a83-goog


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