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