1# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) 2# Most of this file is copied from tools/lib/traceevent/Makefile 3 4BPF_VERSION = 0 5BPF_PATCHLEVEL = 0 6BPF_EXTRAVERSION = 4 7 8MAKEFLAGS += --no-print-directory 9 10ifeq ($(srctree),) 11srctree := $(patsubst %/,%,$(dir $(CURDIR))) 12srctree := $(patsubst %/,%,$(dir $(srctree))) 13srctree := $(patsubst %/,%,$(dir $(srctree))) 14#$(info Determined 'srctree' to be $(srctree)) 15endif 16 17INSTALL = install 18 19# Use DESTDIR for installing into a different root directory. 20# This is useful for building a package. The program will be 21# installed in this directory as if it was the root directory. 22# Then the build tool can move it later. 23DESTDIR ?= 24DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))' 25 26include $(srctree)/tools/scripts/Makefile.arch 27 28ifeq ($(LP64), 1) 29 libdir_relative = lib64 30else 31 libdir_relative = lib 32endif 33 34prefix ?= /usr/local 35libdir = $(prefix)/$(libdir_relative) 36man_dir = $(prefix)/share/man 37man_dir_SQ = '$(subst ','\'',$(man_dir))' 38 39export man_dir man_dir_SQ INSTALL 40export DESTDIR DESTDIR_SQ 41 42include $(srctree)/tools/scripts/Makefile.include 43 44# copy a bit from Linux kbuild 45 46ifeq ("$(origin V)", "command line") 47 VERBOSE = $(V) 48endif 49ifndef VERBOSE 50 VERBOSE = 0 51endif 52 53FEATURE_USER = .libbpf 54FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx 55FEATURE_DISPLAY = libelf bpf 56 57INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi 58FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES) 59 60check_feat := 1 61NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help 62ifdef MAKECMDGOALS 63ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),) 64 check_feat := 0 65endif 66endif 67 68ifeq ($(check_feat),1) 69ifeq ($(FEATURES_DUMP),) 70include $(srctree)/tools/build/Makefile.feature 71else 72include $(FEATURES_DUMP) 73endif 74endif 75 76export prefix libdir src obj 77 78# Shell quotes 79libdir_SQ = $(subst ','\'',$(libdir)) 80libdir_relative_SQ = $(subst ','\'',$(libdir_relative)) 81 82VERSION = $(BPF_VERSION) 83PATCHLEVEL = $(BPF_PATCHLEVEL) 84EXTRAVERSION = $(BPF_EXTRAVERSION) 85 86OBJ = $@ 87N = 88 89LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION) 90 91LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION) 92LIB_FILE = libbpf.a libbpf.so* 93PC_FILE = libbpf.pc 94 95# Set compile option CFLAGS 96ifdef EXTRA_CFLAGS 97 CFLAGS := $(EXTRA_CFLAGS) 98else 99 CFLAGS := -g -Wall 100endif 101 102ifeq ($(feature-libelf-mmap), 1) 103 override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT 104endif 105 106ifeq ($(feature-reallocarray), 0) 107 override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY 108endif 109 110# Append required CFLAGS 111override CFLAGS += $(EXTRA_WARNINGS) 112override CFLAGS += -Werror -Wall 113override CFLAGS += -fPIC 114override CFLAGS += $(INCLUDES) 115override CFLAGS += -fvisibility=hidden 116 117ifeq ($(VERBOSE),1) 118 Q = 119else 120 Q = @ 121endif 122 123# Disable command line variables (CFLAGS) override from top 124# level Makefile (perf), otherwise build Makefile will get 125# the same command line setup. 126MAKEOVERRIDES= 127 128all: 129 130export srctree OUTPUT CC LD CFLAGS V 131include $(srctree)/tools/build/Makefile.include 132 133BPF_IN := $(OUTPUT)libbpf-in.o 134VERSION_SCRIPT := libbpf.map 135 136LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET)) 137LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE)) 138PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE)) 139 140GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN) | \ 141 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print s}') 142VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so | \ 143 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l) 144 145CMD_TARGETS = $(LIB_TARGET) $(PC_FILE) 146 147CXX_TEST_TARGET = $(OUTPUT)test_libbpf 148 149ifeq ($(feature-cxx), 1) 150 CMD_TARGETS += $(CXX_TEST_TARGET) 151endif 152 153TARGETS = $(CMD_TARGETS) 154 155all: fixdep 156 $(Q)$(MAKE) all_cmd 157 158all_cmd: $(CMD_TARGETS) check 159 160$(BPF_IN): force elfdep bpfdep 161 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \ 162 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \ 163 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true 164 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \ 165 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \ 166 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 167 @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \ 168 (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \ 169 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true 170 @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \ 171 (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \ 172 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 173 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \ 174 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \ 175 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 176 $(Q)$(MAKE) $(build)=libbpf 177 178$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION) 179 180$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN) 181 $(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(VERSION) \ 182 -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@ 183 @ln -sf $(@F) $(OUTPUT)libbpf.so 184 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(VERSION) 185 186$(OUTPUT)libbpf.a: $(BPF_IN) 187 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^ 188 189$(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a 190 $(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@ 191 192$(OUTPUT)libbpf.pc: 193 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \ 194 -e "s|@LIBDIR@|$(libdir_SQ)|" \ 195 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \ 196 < libbpf.pc.template > $@ 197 198check: check_abi 199 200check_abi: $(OUTPUT)libbpf.so 201 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \ 202 echo "Warning: Num of global symbols in $(BPF_IN)" \ 203 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \ 204 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \ 205 "Please make sure all LIBBPF_API symbols are" \ 206 "versioned in $(VERSION_SCRIPT)." >&2; \ 207 readelf -s --wide $(OUTPUT)libbpf-in.o | \ 208 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$8}'| \ 209 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \ 210 readelf -s --wide $(OUTPUT)libbpf.so | \ 211 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \ 212 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \ 213 diff -u $(OUTPUT)libbpf_global_syms.tmp \ 214 $(OUTPUT)libbpf_versioned_syms.tmp; \ 215 rm $(OUTPUT)libbpf_global_syms.tmp \ 216 $(OUTPUT)libbpf_versioned_syms.tmp; \ 217 exit 1; \ 218 fi 219 220define do_install_mkdir 221 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \ 222 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \ 223 fi 224endef 225 226define do_install 227 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ 228 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ 229 fi; \ 230 $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2' 231endef 232 233install_lib: all_cmd 234 $(call QUIET_INSTALL, $(LIB_TARGET)) \ 235 $(call do_install_mkdir,$(libdir_SQ)); \ 236 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ) 237 238install_headers: 239 $(call QUIET_INSTALL, headers) \ 240 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \ 241 $(call do_install,libbpf.h,$(prefix)/include/bpf,644); \ 242 $(call do_install,btf.h,$(prefix)/include/bpf,644); \ 243 $(call do_install,libbpf_util.h,$(prefix)/include/bpf,644); \ 244 $(call do_install,xsk.h,$(prefix)/include/bpf,644); 245 246install_pkgconfig: $(PC_FILE) 247 $(call QUIET_INSTALL, $(PC_FILE)) \ 248 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644) 249 250install: install_lib install_pkgconfig 251 252### Cleaning rules 253 254config-clean: 255 $(call QUIET_CLEAN, config) 256 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null 257 258clean: 259 $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \ 260 *.o *~ *.a *.so *.so.$(VERSION) .*.d .*.cmd *.pc LIBBPF-CFLAGS 261 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf 262 263 264 265PHONY += force elfdep bpfdep 266force: 267 268elfdep: 269 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi 270 271bpfdep: 272 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi 273 274# Declare the contents of the .PHONY variable as phony. We keep that 275# information in a variable so we can use it in if_changed and friends. 276.PHONY: $(PHONY) 277