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 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 = $(V) 58endif 59ifndef VERBOSE 60 VERBOSE = 0 61endif 62 63INCLUDES = -I$(if $(OUTPUT),$(OUTPUT),.) \ 64 -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi 65 66export prefix libdir src obj 67 68# Shell quotes 69libdir_SQ = $(subst ','\'',$(libdir)) 70libdir_relative_SQ = $(subst ','\'',$(libdir_relative)) 71 72OBJ = $@ 73N = 74 75LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION) 76LIB_FILE = libbpf.a libbpf.so* 77PC_FILE = libbpf.pc 78 79# Set compile option CFLAGS 80ifdef EXTRA_CFLAGS 81 CFLAGS := $(EXTRA_CFLAGS) 82else 83 CFLAGS := -g -O2 84endif 85 86# Append required CFLAGS 87override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum 88override CFLAGS += -Werror -Wall 89override CFLAGS += $(INCLUDES) 90override CFLAGS += -fvisibility=hidden 91override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 92 93# flags specific for shared library 94SHLIB_FLAGS := -DSHARED -fPIC 95 96ifeq ($(VERBOSE),1) 97 Q = 98else 99 Q = @ 100endif 101 102# Disable command line variables (CFLAGS) override from top 103# level Makefile (perf), otherwise build Makefile will get 104# the same command line setup. 105MAKEOVERRIDES= 106 107all: 108 109export srctree OUTPUT CC LD CFLAGS V 110include $(srctree)/tools/build/Makefile.include 111 112SHARED_OBJDIR := $(OUTPUT)sharedobjs/ 113STATIC_OBJDIR := $(OUTPUT)staticobjs/ 114BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o 115BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o 116VERSION_HDR := $(OUTPUT)libbpf_version.h 117BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h 118BPF_GENERATED := $(BPF_HELPER_DEFS) $(VERSION_HDR) 119 120LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET)) 121LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE)) 122PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE)) 123 124TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags) 125 126GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \ 127 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \ 128 sed 's/\[.*\]//' | \ 129 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \ 130 sort -u | wc -l) 131VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \ 132 sed 's/\[.*\]//' | \ 133 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \ 134 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l) 135 136CMD_TARGETS = $(LIB_TARGET) $(PC_FILE) 137 138all: fixdep 139 $(Q)$(MAKE) all_cmd 140 141all_cmd: $(CMD_TARGETS) check 142 143$(BPF_IN_SHARED): force $(BPF_GENERATED) 144 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \ 145 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \ 146 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true 147 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \ 148 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \ 149 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 150 @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \ 151 (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \ 152 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true 153 @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \ 154 (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \ 155 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 156 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \ 157 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \ 158 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 159 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)" 160 161$(BPF_IN_STATIC): force $(BPF_GENERATED) 162 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR) 163 164$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h 165 $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \ 166 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS) 167 168$(VERSION_HDR): force 169 $(QUIET_GEN)echo "/* This file was auto-generated. */" > $@ 170 @echo "" >> $@ 171 @echo "#define LIBBPF_MAJOR_VERSION $(LIBBPF_MAJOR_VERSION)" >> $@ 172 @echo "#define LIBBPF_MINOR_VERSION $(LIBBPF_MINOR_VERSION)" >> $@ 173 174$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION) 175 176$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT) 177 $(QUIET_LINK)$(CC) $(LDFLAGS) \ 178 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \ 179 -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@ 180 @ln -sf $(@F) $(OUTPUT)libbpf.so 181 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION) 182 183$(OUTPUT)libbpf.a: $(BPF_IN_STATIC) 184 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^ 185 186$(OUTPUT)libbpf.pc: 187 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \ 188 -e "s|@LIBDIR@|$(libdir_SQ)|" \ 189 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \ 190 < libbpf.pc.template > $@ 191 192check: check_abi 193 194check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT) 195 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \ 196 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \ 197 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \ 198 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \ 199 "Please make sure all LIBBPF_API symbols are" \ 200 "versioned in $(VERSION_SCRIPT)." >&2; \ 201 readelf -s --wide $(BPF_IN_SHARED) | \ 202 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \ 203 sed 's/\[.*\]//' | \ 204 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \ 205 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \ 206 readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \ 207 sed 's/\[.*\]//' | \ 208 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \ 209 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \ 210 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \ 211 diff -u $(OUTPUT)libbpf_global_syms.tmp \ 212 $(OUTPUT)libbpf_versioned_syms.tmp; \ 213 rm $(OUTPUT)libbpf_global_syms.tmp \ 214 $(OUTPUT)libbpf_versioned_syms.tmp; \ 215 exit 1; \ 216 fi 217 218define do_install_mkdir 219 if [ ! -d '$(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 236INSTALL_HEADERS = bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h xsk.h \ 237 bpf_helpers.h $(BPF_GENERATED) bpf_tracing.h \ 238 bpf_endian.h bpf_core_read.h skel_internal.h 239 240install_headers: $(BPF_GENERATED) 241 $(call QUIET_INSTALL, headers) \ 242 $(foreach hdr,$(INSTALL_HEADERS), \ 243 $(call do_install,$(hdr),$(prefix)/include/bpf,644);) 244 245install_pkgconfig: $(PC_FILE) 246 $(call QUIET_INSTALL, $(PC_FILE)) \ 247 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644) 248 249install: install_lib install_pkgconfig install_headers 250 251clean: 252 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \ 253 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED) \ 254 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \ 255 $(addprefix $(OUTPUT), \ 256 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc) 257 258PHONY += force cscope tags 259force: 260 261cscope: 262 ls *.c *.h > cscope.files 263 cscope -b -q -I $(srctree)/include -f cscope.out 264 265tags: 266 $(RM) -f TAGS tags 267 ls *.c *.h | xargs $(TAGS_PROG) -a 268 269# Declare the contents of the .PHONY variable as phony. We keep that 270# information in a variable so we can use it in if_changed and friends. 271.PHONY: $(PHONY) 272 273# Delete partially updated (corrupted) files on error 274.DELETE_ON_ERROR: 275