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