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1# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)2# Most of this file is copied from tools/lib/traceevent/Makefile3 4RM ?= rm5srctree := $(realpath $(srctree))6 7VERSION_SCRIPT := libbpf.map8LIBBPF_VERSION := $(shell \9 grep -oE '^LIBBPF_([0-9.]+)' $(VERSION_SCRIPT) | \10 sort -rV | head -n1 | cut -d'_' -f2)11LIBBPF_MAJOR_VERSION := $(word 1,$(subst ., ,$(LIBBPF_VERSION)))12LIBBPF_MINOR_VERSION := $(word 2,$(subst ., ,$(LIBBPF_VERSION)))13 14MAKEFLAGS += --no-print-directory15 16# This will work when bpf is built in tools env. where srctree17# isn't set and when invoked from selftests build, where srctree18# is a ".". building_out_of_srctree is undefined for in srctree19# builds20ifndef building_out_of_srctree21srctree := $(patsubst %/,%,$(dir $(CURDIR)))22srctree := $(patsubst %/,%,$(dir $(srctree)))23srctree := $(patsubst %/,%,$(dir $(srctree)))24#$(info Determined 'srctree' to be $(srctree))25endif26 27INSTALL = install28 29# Use DESTDIR for installing into a different root directory.30# This is useful for building a package. The program will be31# installed in this directory as if it was the root directory.32# Then the build tool can move it later.33DESTDIR ?=34DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'35 36include $(srctree)/tools/scripts/Makefile.arch37 38ifeq ($(LP64), 1)39 libdir_relative = lib6440else41 libdir_relative = lib42endif43 44prefix ?= /usr/local45libdir = $(prefix)/$(libdir_relative)46man_dir = $(prefix)/share/man47man_dir_SQ = '$(subst ','\'',$(man_dir))'48 49export man_dir man_dir_SQ INSTALL50export DESTDIR DESTDIR_SQ51 52include $(srctree)/tools/scripts/Makefile.include53 54# copy a bit from Linux kbuild55 56ifeq ("$(origin V)", "command line")57 VERBOSE = $(V)58endif59ifndef VERBOSE60 VERBOSE = 061endif62 63INCLUDES = -I$(or $(OUTPUT),.) \64 -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi65 66export prefix libdir src obj67 68# Shell quotes69libdir_SQ = $(subst ','\'',$(libdir))70libdir_relative_SQ = $(subst ','\'',$(libdir_relative))71 72OBJ = $@73N =74 75LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)76LIB_FILE = libbpf.a libbpf.so*77PC_FILE = libbpf.pc78 79# Set compile option CFLAGS80ifdef EXTRA_CFLAGS81 CFLAGS := $(EXTRA_CFLAGS)82else83 CFLAGS := -g -O284endif85 86# Append required CFLAGS87override CFLAGS += -std=gnu8988override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum89override CFLAGS += -Werror -Wall90override CFLAGS += $(INCLUDES)91override CFLAGS += -fvisibility=hidden92override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=6493override CFLAGS += $(CLANG_CROSS_FLAGS)94 95# flags specific for shared library96SHLIB_FLAGS := -DSHARED -fPIC97 98ifeq ($(VERBOSE),1)99 Q =100else101 Q = @102endif103 104# Disable command line variables (CFLAGS) override from top105# level Makefile (perf), otherwise build Makefile will get106# the same command line setup.107MAKEOVERRIDES=108 109all:110 111OUTPUT ?= ./112OUTPUT := $(abspath $(OUTPUT))/113export srctree OUTPUT CC LD CFLAGS V114include $(srctree)/tools/build/Makefile.include115 116SHARED_OBJDIR := $(OUTPUT)sharedobjs/117STATIC_OBJDIR := $(OUTPUT)staticobjs/118BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o119BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o120BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h121BPF_GENERATED := $(BPF_HELPER_DEFS)122 123LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))124LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))125PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))126 127TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)128 129GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \130 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \131 sed 's/\[.*\]//' | \132 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \133 sort -u | wc -l)134VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \135 sed 's/\[.*\]//' | \136 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \137 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)138 139CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)140 141all: fixdep142 $(Q)$(MAKE) all_cmd143 144all_cmd: $(CMD_TARGETS) check145 146$(SHARED_OBJDIR) $(STATIC_OBJDIR):147 $(Q)mkdir -p $@148 149$(BPF_IN_SHARED): force $(BPF_GENERATED) | $(SHARED_OBJDIR)150 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \151 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \152 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true153 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \154 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \155 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf_common.h' differs from latest version at 'include/uapi/linux/bpf_common.h'" >&2 )) || true156 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \157 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \158 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true159 $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(SHARED_OBJDIR) $(SHARED_OBJDIR)fixdep160 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"161 162$(BPF_IN_STATIC): force $(BPF_GENERATED) | $(STATIC_OBJDIR)163 $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(STATIC_OBJDIR) $(STATIC_OBJDIR)fixdep164 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)165 166$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h167 $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \168 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)169 170$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)171 172$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)173 $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \174 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \175 -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@176 @ln -sf $(@F) $(OUTPUT)libbpf.so177 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)178 179$(OUTPUT)libbpf.a: $(BPF_IN_STATIC)180 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^181 182$(OUTPUT)libbpf.pc:183 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \184 -e "s|@LIBDIR@|$(libdir_SQ)|" \185 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \186 < libbpf.pc.template > $@187 188check: check_abi check_version189 190check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)191 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \192 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \193 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \194 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \195 "Please make sure all LIBBPF_API symbols are" \196 "versioned in $(VERSION_SCRIPT)." >&2; \197 readelf -s --wide $(BPF_IN_SHARED) | \198 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \199 sed 's/\[.*\]//' | \200 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \201 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \202 readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \203 sed 's/\[.*\]//' | \204 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'| \205 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \206 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \207 diff -u $(OUTPUT)libbpf_global_syms.tmp \208 $(OUTPUT)libbpf_versioned_syms.tmp; \209 rm $(OUTPUT)libbpf_global_syms.tmp \210 $(OUTPUT)libbpf_versioned_syms.tmp; \211 exit 1; \212 fi213 214HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)215HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)216 217check_version: $(VERSION_SCRIPT) libbpf_version.h218 @if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then \219 echo "Error: libbpf major version mismatch detected: " \220 "'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2; \221 exit 1; \222 fi223 @if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then \224 echo "Error: libbpf minor version mismatch detected: " \225 "'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \226 exit 1; \227 fi228 229define do_install_mkdir230 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \231 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \232 fi233endef234 235define do_install236 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \237 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \238 fi; \239 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'240endef241 242install_lib: all_cmd243 $(call QUIET_INSTALL, $(LIB_TARGET)) \244 $(call do_install_mkdir,$(libdir_SQ)); \245 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)246 247SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h \248 bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h \249 skel_internal.h libbpf_version.h usdt.bpf.h250GEN_HDRS := $(BPF_GENERATED)251 252INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf253INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS))254INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS)))255 256$(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h257 $(call QUIET_INSTALL, $@) \258 $(call do_install,$<,$(prefix)/include/bpf,644)259 260$(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h261 $(call QUIET_INSTALL, $@) \262 $(call do_install,$<,$(prefix)/include/bpf,644)263 264install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS)265 $(call QUIET_INSTALL, libbpf_headers)266 267install_pkgconfig: $(PC_FILE)268 $(call QUIET_INSTALL, $(PC_FILE)) \269 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)270 271install: install_lib install_pkgconfig install_headers272 273clean: fixdep-clean274 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \275 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED) \276 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \277 $(addprefix $(OUTPUT), \278 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)279 280PHONY += force cscope tags check check_abi check_version281force:282 283cscope:284 ls *.c *.h > cscope.files285 cscope -b -q -I $(srctree)/include -f cscope.out286 287tags:288 $(RM) -f TAGS tags289 ls *.c *.h | xargs $(TAGS_PROG) -a290 291# Declare the contents of the .PHONY variable as phony. We keep that292# information in a variable so we can use it in if_changed and friends.293.PHONY: $(PHONY)294 295# Delete partially updated (corrupted) files on error296.DELETE_ON_ERROR:297 298help:299 @echo 'libbpf common targets:'300 @echo ' HINT: use "V=1" to enable verbose build'301 @echo ' all - build libraries and pkgconfig'302 @echo ' clean - remove all generated files'303 @echo ' check - check ABI and version info'304 @echo ''305 @echo 'libbpf install targets:'306 @echo ' HINT: use "prefix"(defaults to "/usr/local") or "DESTDIR" (defaults to "/")'307 @echo ' to adjust target destination, e.g. "make prefix=/usr/local install"'308 @echo ' install - build and install all headers, libraries and pkgconfig'309 @echo ' install_headers - install only headers to include/bpf'310 @echo ''311 @echo 'libbpf make targets:'312 @echo ' tags - use ctags to make tag information for source code browsing'313 @echo ' cscope - use cscope to make interactive source code browsing database'314