1# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) 2# Most of this file is copied from tools/lib/traceevent/Makefile 3 4RM ?= rm 5srctree = $(abs_srctree) 6 7VERSION_SCRIPT := libbpf.map 8LIBBPF_VERSION := $(shell \ 9 grep -oE '^LIBBPF_([0-9.]+)' $(VERSION_SCRIPT) | \ 10 sort -rV | head -n1 | cut -d'_' -f2) 11LIBBPF_MAJOR_VERSION := $(firstword $(subst ., ,$(LIBBPF_VERSION))) 12 13MAKEFLAGS += --no-print-directory 14 15# This will work when bpf is built in tools env. where srctree 16# isn't set and when invoked from selftests build, where srctree 17# is a ".". building_out_of_srctree is undefined for in srctree 18# builds 19ifndef building_out_of_srctree 20srctree := $(patsubst %/,%,$(dir $(CURDIR))) 21srctree := $(patsubst %/,%,$(dir $(srctree))) 22srctree := $(patsubst %/,%,$(dir $(srctree))) 23#$(info Determined 'srctree' to be $(srctree)) 24endif 25 26INSTALL = install 27 28# Use DESTDIR for installing into a different root directory. 29# This is useful for building a package. The program will be 30# installed in this directory as if it was the root directory. 31# Then the build tool can move it later. 32DESTDIR ?= 33DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))' 34 35include $(srctree)/tools/scripts/Makefile.arch 36 37ifeq ($(LP64), 1) 38 libdir_relative = lib64 39else 40 libdir_relative = lib 41endif 42 43prefix ?= /usr/local 44libdir = $(prefix)/$(libdir_relative) 45man_dir = $(prefix)/share/man 46man_dir_SQ = '$(subst ','\'',$(man_dir))' 47 48export man_dir man_dir_SQ INSTALL 49export DESTDIR DESTDIR_SQ 50 51include $(srctree)/tools/scripts/Makefile.include 52 53# copy a bit from Linux kbuild 54 55ifeq ("$(origin V)", "command line") 56 VERBOSE = $(V) 57endif 58ifndef VERBOSE 59 VERBOSE = 0 60endif 61 62FEATURE_USER = .libbpf 63FEATURE_TESTS = libelf zlib bpf 64FEATURE_DISPLAY = libelf zlib bpf 65 66INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi 67FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES) 68 69check_feat := 1 70NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help 71ifdef MAKECMDGOALS 72ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),) 73 check_feat := 0 74endif 75endif 76 77ifeq ($(check_feat),1) 78ifeq ($(FEATURES_DUMP),) 79include $(srctree)/tools/build/Makefile.feature 80else 81include $(FEATURES_DUMP) 82endif 83endif 84 85export prefix libdir src obj 86 87# Shell quotes 88libdir_SQ = $(subst ','\'',$(libdir)) 89libdir_relative_SQ = $(subst ','\'',$(libdir_relative)) 90 91OBJ = $@ 92N = 93 94LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION) 95LIB_FILE = libbpf.a libbpf.so* 96PC_FILE = libbpf.pc 97 98# Set compile option CFLAGS 99ifdef EXTRA_CFLAGS 100 CFLAGS := $(EXTRA_CFLAGS) 101else 102 CFLAGS := -g -O2 103endif 104 105# Append required CFLAGS 106override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum 107override CFLAGS += -Werror -Wall 108override CFLAGS += $(INCLUDES) 109override CFLAGS += -fvisibility=hidden 110override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 111 112# flags specific for shared library 113SHLIB_FLAGS := -DSHARED -fPIC 114 115ifeq ($(VERBOSE),1) 116 Q = 117else 118 Q = @ 119endif 120 121# Disable command line variables (CFLAGS) override from top 122# level Makefile (perf), otherwise build Makefile will get 123# the same command line setup. 124MAKEOVERRIDES= 125 126all: 127 128export srctree OUTPUT CC LD CFLAGS V 129include $(srctree)/tools/build/Makefile.include 130 131SHARED_OBJDIR := $(OUTPUT)sharedobjs/ 132STATIC_OBJDIR := $(OUTPUT)staticobjs/ 133BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o 134BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o 135BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h 136 137LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET)) 138LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE)) 139PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE)) 140 141TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags) 142 143GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \ 144 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \ 145 sed 's/\[.*\]//' | \ 146 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \ 147 sort -u | wc -l) 148VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \ 149 sed 's/\[.*\]//' | \ 150 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \ 151 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l) 152 153CMD_TARGETS = $(LIB_TARGET) $(PC_FILE) 154 155all: fixdep 156 $(Q)$(MAKE) all_cmd 157 158all_cmd: $(CMD_TARGETS) check 159 160$(BPF_IN_SHARED): force elfdep zdep bpfdep $(BPF_HELPER_DEFS) 161 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \ 162 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \ 163 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true 164 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \ 165 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \ 166 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 )) || true 167 @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \ 168 (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \ 169 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true 170 @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \ 171 (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \ 172 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_link.h' differs from latest version at 'include/uapi/linux/if_link.h'" >&2 )) || true 173 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \ 174 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \ 175 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 )) || true 176 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)" 177 178$(BPF_IN_STATIC): force elfdep zdep bpfdep $(BPF_HELPER_DEFS) 179 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR) 180 181$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h 182 $(QUIET_GEN)$(srctree)/scripts/bpf_helpers_doc.py --header \ 183 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS) 184 185$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION) 186 187$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT) 188 $(QUIET_LINK)$(CC) $(LDFLAGS) \ 189 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \ 190 -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@ 191 @ln -sf $(@F) $(OUTPUT)libbpf.so 192 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION) 193 194$(OUTPUT)libbpf.a: $(BPF_IN_STATIC) 195 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^ 196 197$(OUTPUT)libbpf.pc: 198 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \ 199 -e "s|@LIBDIR@|$(libdir_SQ)|" \ 200 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \ 201 < libbpf.pc.template > $@ 202 203check: check_abi 204 205check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT) 206 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \ 207 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \ 208 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \ 209 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \ 210 "Please make sure all LIBBPF_API symbols are" \ 211 "versioned in $(VERSION_SCRIPT)." >&2; \ 212 readelf -s --wide $(BPF_IN_SHARED) | \ 213 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \ 214 sed 's/\[.*\]//' | \ 215 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \ 216 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \ 217 readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \ 218 sed 's/\[.*\]//' | \ 219 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'| \ 220 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \ 221 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \ 222 diff -u $(OUTPUT)libbpf_global_syms.tmp \ 223 $(OUTPUT)libbpf_versioned_syms.tmp; \ 224 rm $(OUTPUT)libbpf_global_syms.tmp \ 225 $(OUTPUT)libbpf_versioned_syms.tmp; \ 226 exit 1; \ 227 fi 228 229define do_install_mkdir 230 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \ 231 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \ 232 fi 233endef 234 235define do_install 236 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ 237 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ 238 fi; \ 239 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2' 240endef 241 242install_lib: all_cmd 243 $(call QUIET_INSTALL, $(LIB_TARGET)) \ 244 $(call do_install_mkdir,$(libdir_SQ)); \ 245 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ) 246 247install_headers: $(BPF_HELPER_DEFS) 248 $(call QUIET_INSTALL, headers) \ 249 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \ 250 $(call do_install,libbpf.h,$(prefix)/include/bpf,644); \ 251 $(call do_install,btf.h,$(prefix)/include/bpf,644); \ 252 $(call do_install,libbpf_util.h,$(prefix)/include/bpf,644); \ 253 $(call do_install,libbpf_common.h,$(prefix)/include/bpf,644); \ 254 $(call do_install,xsk.h,$(prefix)/include/bpf,644); \ 255 $(call do_install,bpf_helpers.h,$(prefix)/include/bpf,644); \ 256 $(call do_install,$(BPF_HELPER_DEFS),$(prefix)/include/bpf,644); \ 257 $(call do_install,bpf_tracing.h,$(prefix)/include/bpf,644); \ 258 $(call do_install,bpf_endian.h,$(prefix)/include/bpf,644); \ 259 $(call do_install,bpf_core_read.h,$(prefix)/include/bpf,644); 260 261install_pkgconfig: $(PC_FILE) 262 $(call QUIET_INSTALL, $(PC_FILE)) \ 263 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644) 264 265install: install_lib install_pkgconfig install_headers 266 267### Cleaning rules 268 269config-clean: 270 $(call QUIET_CLEAN, feature-detect) 271 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null 272 273clean: config-clean 274 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \ 275 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_HELPER_DEFS) \ 276 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \ 277 $(addprefix $(OUTPUT), \ 278 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc) 279 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf 280 281 282 283PHONY += force elfdep zdep bpfdep cscope tags 284force: 285 286elfdep: 287 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi 288 289zdep: 290 @if [ "$(feature-zlib)" != "1" ]; then echo "No zlib found"; exit 1 ; fi 291 292bpfdep: 293 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi 294 295cscope: 296 ls *.c *.h > cscope.files 297 cscope -b -q -I $(srctree)/include -f cscope.out 298 299tags: 300 $(RM) -f TAGS tags 301 ls *.c *.h | xargs $(TAGS_PROG) -a 302 303# Declare the contents of the .PHONY variable as phony. We keep that 304# information in a variable so we can use it in if_changed and friends. 305.PHONY: $(PHONY) 306 307# Delete partially updated (corrupted) files on error 308.DELETE_ON_ERROR: 309