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 = 2 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* 93 94# Set compile option CFLAGS 95ifdef EXTRA_CFLAGS 96 CFLAGS := $(EXTRA_CFLAGS) 97else 98 CFLAGS := -g -Wall 99endif 100 101ifeq ($(feature-libelf-mmap), 1) 102 override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT 103endif 104 105ifeq ($(feature-reallocarray), 0) 106 override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY 107endif 108 109# Append required CFLAGS 110override CFLAGS += $(EXTRA_WARNINGS) 111override CFLAGS += -Werror -Wall 112override CFLAGS += -fPIC 113override CFLAGS += $(INCLUDES) 114override CFLAGS += -fvisibility=hidden 115 116ifeq ($(VERBOSE),1) 117 Q = 118else 119 Q = @ 120endif 121 122# Disable command line variables (CFLAGS) override from top 123# level Makefile (perf), otherwise build Makefile will get 124# the same command line setup. 125MAKEOVERRIDES= 126 127all: 128 129export srctree OUTPUT CC LD CFLAGS V 130include $(srctree)/tools/build/Makefile.include 131 132BPF_IN := $(OUTPUT)libbpf-in.o 133VERSION_SCRIPT := libbpf.map 134 135LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET)) 136LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE)) 137 138GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN) | \ 139 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print s}') 140VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so | \ 141 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l) 142 143CMD_TARGETS = $(LIB_TARGET) 144 145CXX_TEST_TARGET = $(OUTPUT)test_libbpf 146 147ifeq ($(feature-cxx), 1) 148 CMD_TARGETS += $(CXX_TEST_TARGET) 149endif 150 151TARGETS = $(CMD_TARGETS) 152 153all: fixdep 154 $(Q)$(MAKE) all_cmd 155 156all_cmd: $(CMD_TARGETS) check 157 158$(BPF_IN): force elfdep bpfdep 159 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \ 160 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \ 161 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true 162 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \ 163 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \ 164 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 165 @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \ 166 (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \ 167 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true 168 @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \ 169 (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \ 170 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 171 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \ 172 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \ 173 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 174 $(Q)$(MAKE) $(build)=libbpf 175 176$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION) 177 178$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN) 179 $(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(VERSION) \ 180 -Wl,--version-script=$(VERSION_SCRIPT) $^ -o $@ 181 @ln -sf $(@F) $(OUTPUT)libbpf.so 182 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(VERSION) 183 184$(OUTPUT)libbpf.a: $(BPF_IN) 185 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^ 186 187$(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a 188 $(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@ 189 190check: check_abi 191 192check_abi: $(OUTPUT)libbpf.so 193 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \ 194 echo "Warning: Num of global symbols in $(BPF_IN)" \ 195 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \ 196 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \ 197 "Please make sure all LIBBPF_API symbols are" \ 198 "versioned in $(VERSION_SCRIPT)." >&2; \ 199 exit 1; \ 200 fi 201 202define do_install_mkdir 203 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \ 204 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \ 205 fi 206endef 207 208define do_install 209 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ 210 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ 211 fi; \ 212 $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2' 213endef 214 215install_lib: all_cmd 216 $(call QUIET_INSTALL, $(LIB_TARGET)) \ 217 $(call do_install_mkdir,$(libdir_SQ)); \ 218 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ) 219 220install_headers: 221 $(call QUIET_INSTALL, headers) \ 222 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \ 223 $(call do_install,libbpf.h,$(prefix)/include/bpf,644); 224 $(call do_install,btf.h,$(prefix)/include/bpf,644); 225 226install: install_lib 227 228### Cleaning rules 229 230config-clean: 231 $(call QUIET_CLEAN, config) 232 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null 233 234clean: 235 $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \ 236 *.o *~ *.a *.so *.so.$(VERSION) .*.d .*.cmd LIBBPF-CFLAGS 237 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf 238 239 240 241PHONY += force elfdep bpfdep 242force: 243 244elfdep: 245 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi 246 247bpfdep: 248 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi 249 250# Declare the contents of the .PHONY variable as phony. We keep that 251# information in a variable so we can use it in if_changed and friends. 252.PHONY: $(PHONY) 253