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 := $(realpath $(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 := $(word 1,$(subst ., ,$(LIBBPF_VERSION))) 12LIBBPF_MINOR_VERSION := $(word 2,$(subst ., ,$(LIBBPF_VERSION))) 13 14MAKEFLAGS += --no-print-directory 15 16# This will work when bpf is built in tools env. where srctree 17# isn't set and when invoked from selftests build, where srctree 18# is a ".". building_out_of_srctree is undefined for in srctree 19# builds 20ifndef building_out_of_srctree 21srctree := $(patsubst %/,%,$(dir $(CURDIR))) 22srctree := $(patsubst %/,%,$(dir $(srctree))) 23srctree := $(patsubst %/,%,$(dir $(srctree))) 24#$(info Determined 'srctree' to be $(srctree)) 25endif 26 27INSTALL = install 28 29# Use DESTDIR for installing into a different root directory. 30# This is useful for building a package. The program will be 31# installed in this directory as if it was the root directory. 32# Then the build tool can move it later. 33DESTDIR ?= 34DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))' 35 36include $(srctree)/tools/scripts/Makefile.arch 37 38ifeq ($(LP64), 1) 39 libdir_relative = lib64 40else 41 libdir_relative = lib 42endif 43 44prefix ?= /usr/local 45libdir = $(prefix)/$(libdir_relative) 46man_dir = $(prefix)/share/man 47man_dir_SQ = '$(subst ','\'',$(man_dir))' 48 49export man_dir man_dir_SQ INSTALL 50export DESTDIR DESTDIR_SQ 51 52# Defer assigning EXTRA_CFLAGS to CFLAGS until after including 53# tools/scripts/Makefile.include, as it may add flags to EXTRA_CFLAGS. 54ifdef EXTRA_CFLAGS 55 CFLAGS := 56else 57 CFLAGS := -g -O2 58endif 59 60include $(srctree)/tools/scripts/Makefile.include 61 62# copy a bit from Linux kbuild 63 64INCLUDES = -I$(or $(OUTPUT),.) \ 65 -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi \ 66 -I$(srctree)/tools/arch/$(SRCARCH)/include 67 68export prefix libdir src obj 69 70# Shell quotes 71libdir_SQ = $(subst ','\'',$(libdir)) 72libdir_relative_SQ = $(subst ','\'',$(libdir_relative)) 73 74OBJ = $@ 75N = 76 77LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION) 78LIB_FILE = libbpf.a libbpf.so* 79PC_FILE = libbpf.pc 80 81# Append required CFLAGS 82override CFLAGS += -std=gnu89 83override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum 84override CFLAGS += -Werror -Wall 85override CFLAGS += $(INCLUDES) 86override CFLAGS += -fvisibility=hidden 87override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 88override CFLAGS += $(EXTRA_CFLAGS) 89 90# flags specific for shared library 91SHLIB_FLAGS := -DSHARED -fPIC 92 93# Disable command line variables (CFLAGS) override from top 94# level Makefile (perf), otherwise build Makefile will get 95# the same command line setup. 96MAKEOVERRIDES= 97 98all: 99 100OUTPUT ?= ./ 101OUTPUT := $(abspath $(OUTPUT))/ 102export srctree OUTPUT CC LD CFLAGS V 103include $(srctree)/tools/build/Makefile.include 104 105SHARED_OBJDIR := $(OUTPUT)sharedobjs/ 106STATIC_OBJDIR := $(OUTPUT)staticobjs/ 107BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o 108BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o 109BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h 110BPF_GENERATED := $(BPF_HELPER_DEFS) 111 112LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET)) 113LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE)) 114PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE)) 115 116TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags) 117 118GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \ 119 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \ 120 sed 's/\[.*\]//' | \ 121 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \ 122 sort -u | wc -l) 123VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \ 124 sed 's/\[.*\]//' | \ 125 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \ 126 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l) 127 128CMD_TARGETS = $(LIB_TARGET) $(PC_FILE) 129 130all: fixdep 131 $(Q)$(MAKE) all_cmd 132 133all_cmd: $(CMD_TARGETS) check 134 135$(SHARED_OBJDIR) $(STATIC_OBJDIR): 136 $(Q)mkdir -p $@ 137 138$(BPF_IN_SHARED): force $(BPF_GENERATED) | $(SHARED_OBJDIR) 139 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \ 140 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \ 141 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true 142 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \ 143 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \ 144 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 145 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \ 146 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \ 147 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 148 $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(SHARED_OBJDIR) $(SHARED_OBJDIR)fixdep 149 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)" 150 151$(BPF_IN_STATIC): force $(BPF_GENERATED) | $(STATIC_OBJDIR) 152 $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(STATIC_OBJDIR) $(STATIC_OBJDIR)fixdep 153 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR) 154 155$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h 156 $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \ 157 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS) 158 159$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION) 160 161$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT) 162 $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \ 163 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \ 164 -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@ 165 @ln -sf $(@F) $(OUTPUT)libbpf.so 166 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION) 167 168$(OUTPUT)libbpf.a: $(BPF_IN_STATIC) 169 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^ 170 171$(OUTPUT)libbpf.pc: 172 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \ 173 -e "s|@LIBDIR@|$(libdir_SQ)|" \ 174 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \ 175 < libbpf.pc.template > $@ 176 177check: check_abi check_version 178 179check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT) 180 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \ 181 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \ 182 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \ 183 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \ 184 "Please make sure all LIBBPF_API symbols are" \ 185 "versioned in $(VERSION_SCRIPT)." >&2; \ 186 readelf -s --wide $(BPF_IN_SHARED) | \ 187 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \ 188 sed 's/\[.*\]//' | \ 189 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \ 190 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \ 191 readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \ 192 sed 's/\[.*\]//' | \ 193 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'| \ 194 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \ 195 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \ 196 diff -u $(OUTPUT)libbpf_global_syms.tmp \ 197 $(OUTPUT)libbpf_versioned_syms.tmp; \ 198 rm $(OUTPUT)libbpf_global_syms.tmp \ 199 $(OUTPUT)libbpf_versioned_syms.tmp; \ 200 exit 1; \ 201 fi 202 203HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3) 204HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3) 205 206check_version: $(VERSION_SCRIPT) libbpf_version.h 207 @if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then \ 208 echo "Error: libbpf major version mismatch detected: " \ 209 "'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2; \ 210 exit 1; \ 211 fi 212 @if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then \ 213 echo "Error: libbpf minor version mismatch detected: " \ 214 "'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \ 215 exit 1; \ 216 fi 217 218define do_install_mkdir 219 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \ 220 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \ 221 fi 222endef 223 224define do_install 225 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ 226 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ 227 fi; \ 228 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2' 229endef 230 231install_lib: all_cmd 232 $(call QUIET_INSTALL, $(LIB_TARGET)) \ 233 $(call do_install_mkdir,$(libdir_SQ)); \ 234 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ) 235 236SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h \ 237 bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h \ 238 skel_internal.h libbpf_version.h usdt.bpf.h 239GEN_HDRS := $(BPF_GENERATED) 240 241INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf 242INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS)) 243INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS))) 244 245$(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h 246 $(call QUIET_INSTALL, $@) \ 247 $(call do_install,$<,$(prefix)/include/bpf,644) 248 249$(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h 250 $(call QUIET_INSTALL, $@) \ 251 $(call do_install,$<,$(prefix)/include/bpf,644) 252 253install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS) 254 $(call QUIET_INSTALL, libbpf_headers) 255 256install_pkgconfig: $(PC_FILE) 257 $(call QUIET_INSTALL, $(PC_FILE)) \ 258 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644) 259 260install: install_lib install_pkgconfig install_headers 261 262clean: fixdep-clean 263 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \ 264 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED) \ 265 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \ 266 $(addprefix $(OUTPUT), \ 267 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc) 268 269PHONY += force cscope tags check check_abi check_version 270force: 271 272cscope: 273 ls *.c *.h > cscope.files 274 cscope -b -q -I $(srctree)/include -f cscope.out 275 276tags: 277 $(RM) -f TAGS tags 278 ls *.c *.h | xargs $(TAGS_PROG) -a 279 280# Declare the contents of the .PHONY variable as phony. We keep that 281# information in a variable so we can use it in if_changed and friends. 282.PHONY: $(PHONY) 283 284# Delete partially updated (corrupted) files on error 285.DELETE_ON_ERROR: 286 287help: 288 @echo 'libbpf common targets:' 289 @echo ' HINT: use "V=1" to enable verbose build' 290 @echo ' all - build libraries and pkgconfig' 291 @echo ' clean - remove all generated files' 292 @echo ' check - check ABI and version info' 293 @echo '' 294 @echo 'libbpf install targets:' 295 @echo ' HINT: use "prefix"(defaults to "/usr/local") or "DESTDIR" (defaults to "/")' 296 @echo ' to adjust target destination, e.g. "make prefix=/usr/local install"' 297 @echo ' install - build and install all headers, libraries and pkgconfig' 298 @echo ' install_headers - install only headers to include/bpf' 299 @echo '' 300 @echo 'libbpf make targets:' 301 @echo ' tags - use ctags to make tag information for source code browsing' 302 @echo ' cscope - use cscope to make interactive source code browsing database' 303