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