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 52include $(srctree)/tools/scripts/Makefile.include 53 54# copy a bit from Linux kbuild 55 56ifeq ("$(origin V)", "command line") 57 VERBOSE = $(V) 58endif 59ifndef VERBOSE 60 VERBOSE = 0 61endif 62 63INCLUDES = -I$(or $(OUTPUT),.) \ 64 -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi \ 65 -I$(srctree)/tools/arch/$(SRCARCH)/include 66 67export prefix libdir src obj 68 69# Shell quotes 70libdir_SQ = $(subst ','\'',$(libdir)) 71libdir_relative_SQ = $(subst ','\'',$(libdir_relative)) 72 73OBJ = $@ 74N = 75 76LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION) 77LIB_FILE = libbpf.a libbpf.so* 78PC_FILE = libbpf.pc 79 80# Set compile option CFLAGS 81ifdef EXTRA_CFLAGS 82 CFLAGS := $(EXTRA_CFLAGS) 83else 84 CFLAGS := -g -O2 85endif 86 87# Append required CFLAGS 88override CFLAGS += -std=gnu89 89override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum 90override CFLAGS += -Werror -Wall 91override CFLAGS += $(INCLUDES) 92override CFLAGS += -fvisibility=hidden 93override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 94override CFLAGS += $(CLANG_CROSS_FLAGS) 95 96# flags specific for shared library 97SHLIB_FLAGS := -DSHARED -fPIC 98 99ifeq ($(VERBOSE),1) 100 Q = 101else 102 Q = @ 103endif 104 105# Disable command line variables (CFLAGS) override from top 106# level Makefile (perf), otherwise build Makefile will get 107# the same command line setup. 108MAKEOVERRIDES= 109 110all: 111 112OUTPUT ?= ./ 113OUTPUT := $(abspath $(OUTPUT))/ 114export srctree OUTPUT CC LD CFLAGS V 115include $(srctree)/tools/build/Makefile.include 116 117SHARED_OBJDIR := $(OUTPUT)sharedobjs/ 118STATIC_OBJDIR := $(OUTPUT)staticobjs/ 119BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o 120BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o 121BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h 122BPF_GENERATED := $(BPF_HELPER_DEFS) 123 124LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET)) 125LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE)) 126PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE)) 127 128TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags) 129 130GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \ 131 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \ 132 sed 's/\[.*\]//' | \ 133 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \ 134 sort -u | wc -l) 135VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \ 136 sed 's/\[.*\]//' | \ 137 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \ 138 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l) 139 140CMD_TARGETS = $(LIB_TARGET) $(PC_FILE) 141 142all: fixdep 143 $(Q)$(MAKE) all_cmd 144 145all_cmd: $(CMD_TARGETS) check 146 147$(SHARED_OBJDIR) $(STATIC_OBJDIR): 148 $(Q)mkdir -p $@ 149 150$(BPF_IN_SHARED): force $(BPF_GENERATED) | $(SHARED_OBJDIR) 151 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \ 152 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \ 153 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true 154 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \ 155 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \ 156 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 157 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \ 158 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \ 159 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 160 $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(SHARED_OBJDIR) $(SHARED_OBJDIR)fixdep 161 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)" 162 163$(BPF_IN_STATIC): force $(BPF_GENERATED) | $(STATIC_OBJDIR) 164 $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(STATIC_OBJDIR) $(STATIC_OBJDIR)fixdep 165 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR) 166 167$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h 168 $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \ 169 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS) 170 171$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION) 172 173$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT) 174 $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \ 175 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \ 176 -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@ 177 @ln -sf $(@F) $(OUTPUT)libbpf.so 178 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION) 179 180$(OUTPUT)libbpf.a: $(BPF_IN_STATIC) 181 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^ 182 183$(OUTPUT)libbpf.pc: 184 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \ 185 -e "s|@LIBDIR@|$(libdir_SQ)|" \ 186 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \ 187 < libbpf.pc.template > $@ 188 189check: check_abi check_version 190 191check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT) 192 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \ 193 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \ 194 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \ 195 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \ 196 "Please make sure all LIBBPF_API symbols are" \ 197 "versioned in $(VERSION_SCRIPT)." >&2; \ 198 readelf -s --wide $(BPF_IN_SHARED) | \ 199 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \ 200 sed 's/\[.*\]//' | \ 201 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \ 202 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \ 203 readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \ 204 sed 's/\[.*\]//' | \ 205 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'| \ 206 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \ 207 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \ 208 diff -u $(OUTPUT)libbpf_global_syms.tmp \ 209 $(OUTPUT)libbpf_versioned_syms.tmp; \ 210 rm $(OUTPUT)libbpf_global_syms.tmp \ 211 $(OUTPUT)libbpf_versioned_syms.tmp; \ 212 exit 1; \ 213 fi 214 215HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3) 216HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3) 217 218check_version: $(VERSION_SCRIPT) libbpf_version.h 219 @if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then \ 220 echo "Error: libbpf major version mismatch detected: " \ 221 "'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2; \ 222 exit 1; \ 223 fi 224 @if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then \ 225 echo "Error: libbpf minor version mismatch detected: " \ 226 "'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \ 227 exit 1; \ 228 fi 229 230define do_install_mkdir 231 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \ 232 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \ 233 fi 234endef 235 236define do_install 237 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ 238 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ 239 fi; \ 240 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2' 241endef 242 243install_lib: all_cmd 244 $(call QUIET_INSTALL, $(LIB_TARGET)) \ 245 $(call do_install_mkdir,$(libdir_SQ)); \ 246 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ) 247 248SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h \ 249 bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h \ 250 skel_internal.h libbpf_version.h usdt.bpf.h 251GEN_HDRS := $(BPF_GENERATED) 252 253INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf 254INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS)) 255INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS))) 256 257$(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h 258 $(call QUIET_INSTALL, $@) \ 259 $(call do_install,$<,$(prefix)/include/bpf,644) 260 261$(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h 262 $(call QUIET_INSTALL, $@) \ 263 $(call do_install,$<,$(prefix)/include/bpf,644) 264 265install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS) 266 $(call QUIET_INSTALL, libbpf_headers) 267 268install_pkgconfig: $(PC_FILE) 269 $(call QUIET_INSTALL, $(PC_FILE)) \ 270 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644) 271 272install: install_lib install_pkgconfig install_headers 273 274clean: fixdep-clean 275 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \ 276 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED) \ 277 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \ 278 $(addprefix $(OUTPUT), \ 279 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc) 280 281PHONY += force cscope tags check check_abi check_version 282force: 283 284cscope: 285 ls *.c *.h > cscope.files 286 cscope -b -q -I $(srctree)/include -f cscope.out 287 288tags: 289 $(RM) -f TAGS tags 290 ls *.c *.h | xargs $(TAGS_PROG) -a 291 292# Declare the contents of the .PHONY variable as phony. We keep that 293# information in a variable so we can use it in if_changed and friends. 294.PHONY: $(PHONY) 295 296# Delete partially updated (corrupted) files on error 297.DELETE_ON_ERROR: 298 299help: 300 @echo 'libbpf common targets:' 301 @echo ' HINT: use "V=1" to enable verbose build' 302 @echo ' all - build libraries and pkgconfig' 303 @echo ' clean - remove all generated files' 304 @echo ' check - check ABI and version info' 305 @echo '' 306 @echo 'libbpf install targets:' 307 @echo ' HINT: use "prefix"(defaults to "/usr/local") or "DESTDIR" (defaults to "/")' 308 @echo ' to adjust target destination, e.g. "make prefix=/usr/local install"' 309 @echo ' install - build and install all headers, libraries and pkgconfig' 310 @echo ' install_headers - install only headers to include/bpf' 311 @echo '' 312 @echo 'libbpf make targets:' 313 @echo ' tags - use ctags to make tag information for source code browsing' 314 @echo ' cscope - use cscope to make interactive source code browsing database' 315