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 7LIBBPF_VERSION := $(shell \ 8 grep -oE '^LIBBPF_([0-9.]+)' libbpf.map | \ 9 sort -rV | head -n1 | cut -d'_' -f2) 10LIBBPF_MAJOR_VERSION := $(firstword $(subst ., ,$(LIBBPF_VERSION))) 11 12MAKEFLAGS += --no-print-directory 13 14# This will work when bpf is built in tools env. where srctree 15# isn't set and when invoked from selftests build, where srctree 16# is a ".". building_out_of_srctree is undefined for in srctree 17# builds 18ifndef building_out_of_srctree 19srctree := $(patsubst %/,%,$(dir $(CURDIR))) 20srctree := $(patsubst %/,%,$(dir $(srctree))) 21srctree := $(patsubst %/,%,$(dir $(srctree))) 22#$(info Determined 'srctree' to be $(srctree)) 23endif 24 25INSTALL = install 26 27# Use DESTDIR for installing into a different root directory. 28# This is useful for building a package. The program will be 29# installed in this directory as if it was the root directory. 30# Then the build tool can move it later. 31DESTDIR ?= 32DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))' 33 34include $(srctree)/tools/scripts/Makefile.arch 35 36ifeq ($(LP64), 1) 37 libdir_relative = lib64 38else 39 libdir_relative = lib 40endif 41 42prefix ?= /usr/local 43libdir = $(prefix)/$(libdir_relative) 44man_dir = $(prefix)/share/man 45man_dir_SQ = '$(subst ','\'',$(man_dir))' 46 47export man_dir man_dir_SQ INSTALL 48export DESTDIR DESTDIR_SQ 49 50include $(srctree)/tools/scripts/Makefile.include 51 52# copy a bit from Linux kbuild 53 54ifeq ("$(origin V)", "command line") 55 VERBOSE = $(V) 56endif 57ifndef VERBOSE 58 VERBOSE = 0 59endif 60 61INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi 62 63export prefix libdir src obj 64 65# Shell quotes 66libdir_SQ = $(subst ','\'',$(libdir)) 67libdir_relative_SQ = $(subst ','\'',$(libdir_relative)) 68 69OBJ = $@ 70N = 71 72LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION) 73LIB_FILE = libbpf.a libbpf.so* 74PC_FILE = libbpf.pc 75 76# Set compile option CFLAGS 77ifdef EXTRA_CFLAGS 78 CFLAGS := $(EXTRA_CFLAGS) 79else 80 CFLAGS := -g -O2 81endif 82 83# Append required CFLAGS 84override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum 85override CFLAGS += -Werror -Wall 86override CFLAGS += $(INCLUDES) 87override CFLAGS += -fvisibility=hidden 88override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 89 90# flags specific for shared library 91SHLIB_FLAGS := -DSHARED -fPIC 92 93ifeq ($(VERBOSE),1) 94 Q = 95else 96 Q = @ 97endif 98 99# Disable command line variables (CFLAGS) override from top 100# level Makefile (perf), otherwise build Makefile will get 101# the same command line setup. 102MAKEOVERRIDES= 103 104all: 105 106export srctree OUTPUT CC LD CFLAGS V 107include $(srctree)/tools/build/Makefile.include 108 109SHARED_OBJDIR := $(OUTPUT)sharedobjs/ 110STATIC_OBJDIR := $(OUTPUT)staticobjs/ 111BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o 112BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o 113VERSION_SCRIPT := libbpf.map 114BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h 115 116LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET)) 117LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE)) 118PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE)) 119 120TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags) 121 122GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \ 123 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \ 124 sed 's/\[.*\]//' | \ 125 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \ 126 sort -u | wc -l) 127VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \ 128 sed 's/\[.*\]//' | \ 129 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \ 130 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l) 131 132CMD_TARGETS = $(LIB_TARGET) $(PC_FILE) 133 134all: fixdep 135 $(Q)$(MAKE) all_cmd 136 137all_cmd: $(CMD_TARGETS) check 138 139$(BPF_IN_SHARED): force $(BPF_HELPER_DEFS) 140 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \ 141 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \ 142 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true 143 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \ 144 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \ 145 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 146 @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \ 147 (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \ 148 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true 149 @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \ 150 (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \ 151 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 152 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \ 153 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \ 154 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 155 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)" 156 157$(BPF_IN_STATIC): force $(BPF_HELPER_DEFS) 158 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR) 159 160$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h 161 $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \ 162 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS) 163 164$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION) 165 166$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) 167 $(QUIET_LINK)$(CC) $(LDFLAGS) \ 168 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \ 169 -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -lz -o $@ 170 @ln -sf $(@F) $(OUTPUT)libbpf.so 171 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION) 172 173$(OUTPUT)libbpf.a: $(BPF_IN_STATIC) 174 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^ 175 176$(OUTPUT)libbpf.pc: 177 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \ 178 -e "s|@LIBDIR@|$(libdir_SQ)|" \ 179 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \ 180 < libbpf.pc.template > $@ 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 $(BPF_IN_SHARED)" \ 187 "($(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 readelf -s --wide $(BPF_IN_SHARED) | \ 192 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \ 193 sed 's/\[.*\]//' | \ 194 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \ 195 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \ 196 readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \ 197 sed 's/\[.*\]//' | \ 198 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \ 199 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \ 200 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \ 201 diff -u $(OUTPUT)libbpf_global_syms.tmp \ 202 $(OUTPUT)libbpf_versioned_syms.tmp; \ 203 rm $(OUTPUT)libbpf_global_syms.tmp \ 204 $(OUTPUT)libbpf_versioned_syms.tmp; \ 205 exit 1; \ 206 fi 207 208define do_install_mkdir 209 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \ 210 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \ 211 fi 212endef 213 214define do_install 215 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ 216 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ 217 fi; \ 218 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2' 219endef 220 221install_lib: all_cmd 222 $(call QUIET_INSTALL, $(LIB_TARGET)) \ 223 $(call do_install_mkdir,$(libdir_SQ)); \ 224 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ) 225 226INSTALL_HEADERS = bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h xsk.h \ 227 bpf_helpers.h $(BPF_HELPER_DEFS) bpf_tracing.h \ 228 bpf_endian.h bpf_core_read.h skel_internal.h 229 230install_headers: $(BPF_HELPER_DEFS) 231 $(call QUIET_INSTALL, headers) \ 232 $(foreach hdr,$(INSTALL_HEADERS), \ 233 $(call do_install,$(hdr),$(prefix)/include/bpf,644);) 234 235install_pkgconfig: $(PC_FILE) 236 $(call QUIET_INSTALL, $(PC_FILE)) \ 237 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644) 238 239install: install_lib install_pkgconfig install_headers 240 241clean: 242 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \ 243 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_HELPER_DEFS) \ 244 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \ 245 $(addprefix $(OUTPUT), \ 246 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc) 247 248PHONY += force cscope tags 249force: 250 251cscope: 252 ls *.c *.h > cscope.files 253 cscope -b -q -I $(srctree)/include -f cscope.out 254 255tags: 256 $(RM) -f TAGS tags 257 ls *.c *.h | xargs $(TAGS_PROG) -a 258 259# Declare the contents of the .PHONY variable as phony. We keep that 260# information in a variable so we can use it in if_changed and friends. 261.PHONY: $(PHONY) 262 263# Delete partially updated (corrupted) files on error 264.DELETE_ON_ERROR: 265