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 = 1 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 82LIB_FILE = libbpf.a libbpf.so 83 84VERSION = $(BPF_VERSION) 85PATCHLEVEL = $(BPF_PATCHLEVEL) 86EXTRAVERSION = $(BPF_EXTRAVERSION) 87 88OBJ = $@ 89N = 90 91LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION) 92 93# Set compile option CFLAGS 94ifdef EXTRA_CFLAGS 95 CFLAGS := $(EXTRA_CFLAGS) 96else 97 CFLAGS := -g -Wall 98endif 99 100ifeq ($(feature-libelf-mmap), 1) 101 override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT 102endif 103 104ifeq ($(feature-reallocarray), 0) 105 override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY 106endif 107 108# Append required CFLAGS 109override CFLAGS += $(EXTRA_WARNINGS) 110override CFLAGS += -Werror -Wall 111override CFLAGS += -fPIC 112override CFLAGS += $(INCLUDES) 113override CFLAGS += -fvisibility=hidden 114 115ifeq ($(VERBOSE),1) 116 Q = 117else 118 Q = @ 119endif 120 121# Disable command line variables (CFLAGS) override from top 122# level Makefile (perf), otherwise build Makefile will get 123# the same command line setup. 124MAKEOVERRIDES= 125 126all: 127 128export srctree OUTPUT CC LD CFLAGS V 129include $(srctree)/tools/build/Makefile.include 130 131BPF_IN := $(OUTPUT)libbpf-in.o 132LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE)) 133VERSION_SCRIPT := libbpf.map 134 135GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN) | \ 136 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print s}') 137VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so | \ 138 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l) 139 140CMD_TARGETS = $(LIB_FILE) 141 142CXX_TEST_TARGET = $(OUTPUT)test_libbpf 143 144ifeq ($(feature-cxx), 1) 145 CMD_TARGETS += $(CXX_TEST_TARGET) 146endif 147 148TARGETS = $(CMD_TARGETS) 149 150all: fixdep all_cmd 151 152all_cmd: $(CMD_TARGETS) check 153 154$(BPF_IN): force elfdep bpfdep 155 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \ 156 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \ 157 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true 158 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \ 159 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \ 160 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 161 @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \ 162 (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \ 163 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true 164 @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \ 165 (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \ 166 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 167 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \ 168 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \ 169 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 170 $(Q)$(MAKE) $(build)=libbpf 171 172$(OUTPUT)libbpf.so: $(BPF_IN) 173 $(QUIET_LINK)$(CC) --shared -Wl,--version-script=$(VERSION_SCRIPT) \ 174 $^ -o $@ 175 176$(OUTPUT)libbpf.a: $(BPF_IN) 177 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^ 178 179$(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a 180 $(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@ 181 182check: check_abi 183 184check_abi: $(OUTPUT)libbpf.so 185 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \ 186 echo "Warning: Num of global symbols in $(BPF_IN)" \ 187 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \ 188 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \ 189 "Please make sure all LIBBPF_API symbols are" \ 190 "versioned in $(VERSION_SCRIPT)." >&2; \ 191 exit 1; \ 192 fi 193 194define do_install 195 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ 196 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ 197 fi; \ 198 $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2' 199endef 200 201install_lib: all_cmd 202 $(call QUIET_INSTALL, $(LIB_FILE)) \ 203 $(call do_install,$(LIB_FILE),$(libdir_SQ)) 204 205install_headers: 206 $(call QUIET_INSTALL, headers) \ 207 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \ 208 $(call do_install,libbpf.h,$(prefix)/include/bpf,644); 209 $(call do_install,btf.h,$(prefix)/include/bpf,644); 210 211install: install_lib 212 213### Cleaning rules 214 215config-clean: 216 $(call QUIET_CLEAN, config) 217 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null 218 219clean: 220 $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \ 221 *.o *~ *.a *.so .*.d .*.cmd LIBBPF-CFLAGS 222 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf 223 224 225 226PHONY += force elfdep bpfdep 227force: 228 229elfdep: 230 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi 231 232bpfdep: 233 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi 234 235# Declare the contents of the .PHONY variable as phony. We keep that 236# information in a variable so we can use it in if_changed and friends. 237.PHONY: $(PHONY) 238