Re: [PATCH bpf-next] perf build: Install libbpf headers locally when building
From: Andrii Nakryiko <hidden>
Date: 2021-11-05 18:39:05
Also in:
bpf, lkml
On Thu, Nov 4, 2021 at 7:02 PM Quentin Monnet [off-list ref] wrote:
API headers from libbpf should not be accessed directly from the library's source directory. Instead, they should be exported with "make install_headers". Let's adjust perf's Makefile to install those headers locally when building libbpf. Signed-off-by: Quentin Monnet <redacted> --- Note: Sending to bpf-next because it's directly related to libbpf, and to similar patches merged through bpf-next, but maybe Arnaldo prefers to take it?
Arnaldo would know better how to thoroughly test it, so I'd prefer to route this through perf tree. Any objections, Arnaldo?
quoted hunk ↗ jump to hunk
--- tools/perf/Makefile.perf | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-)diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf index b856afa6eb52..3a81b6c712a9 100644 --- a/tools/perf/Makefile.perf +++ b/tools/perf/Makefile.perf@@ -241,7 +241,7 @@ else # force_fixdep LIB_DIR = $(srctree)/tools/lib/api/ TRACE_EVENT_DIR = $(srctree)/tools/lib/traceevent/ -BPF_DIR = $(srctree)/tools/lib/bpf/ +LIBBPF_DIR = $(srctree)/tools/lib/bpf/ SUBCMD_DIR = $(srctree)/tools/lib/subcmd/ LIBPERF_DIR = $(srctree)/tools/lib/perf/ DOC_DIR = $(srctree)/tools/perf/Documentation/@@ -293,7 +293,6 @@ strip-libs = $(filter-out -l%,$(1)) ifneq ($(OUTPUT),) TE_PATH=$(OUTPUT) PLUGINS_PATH=$(OUTPUT) - BPF_PATH=$(OUTPUT) SUBCMD_PATH=$(OUTPUT) LIBPERF_PATH=$(OUTPUT) ifneq ($(subdir),)@@ -305,7 +304,6 @@ else TE_PATH=$(TRACE_EVENT_DIR) PLUGINS_PATH=$(TRACE_EVENT_DIR)plugins/ API_PATH=$(LIB_DIR) - BPF_PATH=$(BPF_DIR) SUBCMD_PATH=$(SUBCMD_DIR) LIBPERF_PATH=$(LIBPERF_DIR) endif@@ -324,7 +322,10 @@ LIBTRACEEVENT_DYNAMIC_LIST_LDFLAGS = $(if $(findstring -static,$(LDFLAGS)),,$(DY LIBAPI = $(API_PATH)libapi.a export LIBAPI -LIBBPF = $(BPF_PATH)libbpf.a +LIBBPF_OUTPUT = $(OUTPUT)libbpf +LIBBPF_DESTDIR = $(LIBBPF_OUTPUT) +LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include +LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a LIBSUBCMD = $(SUBCMD_PATH)libsubcmd.a@@ -829,12 +830,14 @@ $(LIBAPI)-clean: $(call QUIET_CLEAN, libapi) $(Q)$(MAKE) -C $(LIB_DIR) O=$(OUTPUT) clean >/dev/null -$(LIBBPF): FORCE - $(Q)$(MAKE) -C $(BPF_DIR) O=$(OUTPUT) $(OUTPUT)libbpf.a FEATURES_DUMP=$(FEATURE_DUMP_EXPORT) +$(LIBBPF): FORCE | $(LIBBPF_OUTPUT) + $(Q)$(MAKE) -C $(LIBBPF_DIR) FEATURES_DUMP=$(FEATURE_DUMP_EXPORT) \ + O= OUTPUT=$(LIBBPF_OUTPUT)/ DESTDIR=$(LIBBPF_DESTDIR) prefix= \ + $@ install_headers $(LIBBPF)-clean: $(call QUIET_CLEAN, libbpf) - $(Q)$(MAKE) -C $(BPF_DIR) O=$(OUTPUT) clean >/dev/null + $(Q)$(RM) -r -- $(LIBBPF_OUTPUT) $(LIBPERF): FORCE $(Q)$(MAKE) -C $(LIBPERF_DIR) EXTRA_CFLAGS="$(LIBPERF_CFLAGS)" O=$(OUTPUT) $(OUTPUT)libperf.a@@ -1036,14 +1039,13 @@ SKELETONS += $(SKEL_OUT)/bperf_cgroup.skel.h ifdef BUILD_BPF_SKEL BPFTOOL := $(SKEL_TMP_OUT)/bootstrap/bpftool -LIBBPF_SRC := $(abspath ../lib/bpf) -BPF_INCLUDE := -I$(SKEL_TMP_OUT)/.. -I$(BPF_PATH) -I$(LIBBPF_SRC)/.. +BPF_INCLUDE := -I$(SKEL_TMP_OUT)/.. -I$(LIBBPF_INCLUDE) -$(SKEL_TMP_OUT): +$(SKEL_TMP_OUT) $(LIBBPF_OUTPUT): $(Q)$(MKDIR) -p $@ $(BPFTOOL): | $(SKEL_TMP_OUT) - CFLAGS= $(MAKE) -C ../bpf/bpftool \ + $(Q)CFLAGS= $(MAKE) -C ../bpf/bpftool \ OUTPUT=$(SKEL_TMP_OUT)/ bootstrap VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \ --2.32.0