1# Most of this file is copied from tools/lib/traceevent/Makefile 2 3BPF_VERSION = 0 4BPF_PATCHLEVEL = 0 5BPF_EXTRAVERSION = 1 6 7MAKEFLAGS += --no-print-directory 8 9ifeq ($(srctree),) 10srctree := $(patsubst %/,%,$(dir $(shell pwd))) 11srctree := $(patsubst %/,%,$(dir $(srctree))) 12srctree := $(patsubst %/,%,$(dir $(srctree))) 13#$(info Determined 'srctree' to be $(srctree)) 14endif 15 16# Makefiles suck: This macro sets a default value of $(2) for the 17# variable named by $(1), unless the variable has been set by 18# environment or command line. This is necessary for CC and AR 19# because make sets default values, so the simpler ?= approach 20# won't work as expected. 21define allow-override 22 $(if $(or $(findstring environment,$(origin $(1))),\ 23 $(findstring command line,$(origin $(1)))),,\ 24 $(eval $(1) = $(2))) 25endef 26 27# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix. 28$(call allow-override,CC,$(CROSS_COMPILE)gcc) 29$(call allow-override,AR,$(CROSS_COMPILE)ar) 30 31INSTALL = install 32 33# Use DESTDIR for installing into a different root directory. 34# This is useful for building a package. The program will be 35# installed in this directory as if it was the root directory. 36# Then the build tool can move it later. 37DESTDIR ?= 38DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))' 39 40include $(srctree)/tools/scripts/Makefile.arch 41 42ifeq ($(LP64), 1) 43 libdir_relative = lib64 44else 45 libdir_relative = lib 46endif 47 48prefix ?= /usr/local 49libdir = $(prefix)/$(libdir_relative) 50man_dir = $(prefix)/share/man 51man_dir_SQ = '$(subst ','\'',$(man_dir))' 52 53export man_dir man_dir_SQ INSTALL 54export DESTDIR DESTDIR_SQ 55 56include ../../scripts/Makefile.include 57 58# copy a bit from Linux kbuild 59 60ifeq ("$(origin V)", "command line") 61 VERBOSE = $(V) 62endif 63ifndef VERBOSE 64 VERBOSE = 0 65endif 66 67FEATURE_USER = .libbpf 68FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf 69FEATURE_DISPLAY = libelf bpf 70 71INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi 72FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES) 73 74check_feat := 1 75NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help 76ifdef MAKECMDGOALS 77ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),) 78 check_feat := 0 79endif 80endif 81 82ifeq ($(check_feat),1) 83ifeq ($(FEATURES_DUMP),) 84include $(srctree)/tools/build/Makefile.feature 85else 86include $(FEATURES_DUMP) 87endif 88endif 89 90export prefix libdir src obj 91 92# Shell quotes 93libdir_SQ = $(subst ','\'',$(libdir)) 94libdir_relative_SQ = $(subst ','\'',$(libdir_relative)) 95plugin_dir_SQ = $(subst ','\'',$(plugin_dir)) 96 97LIB_FILE = libbpf.a libbpf.so 98 99VERSION = $(BPF_VERSION) 100PATCHLEVEL = $(BPF_PATCHLEVEL) 101EXTRAVERSION = $(BPF_EXTRAVERSION) 102 103OBJ = $@ 104N = 105 106LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION) 107 108# Set compile option CFLAGS 109ifdef EXTRA_CFLAGS 110 CFLAGS := $(EXTRA_CFLAGS) 111else 112 CFLAGS := -g -Wall 113endif 114 115ifeq ($(feature-libelf-mmap), 1) 116 override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT 117endif 118 119ifeq ($(feature-libelf-getphdrnum), 1) 120 override CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT 121endif 122 123# Append required CFLAGS 124override CFLAGS += $(EXTRA_WARNINGS) 125override CFLAGS += -Werror -Wall 126override CFLAGS += -fPIC 127override CFLAGS += $(INCLUDES) 128 129ifeq ($(VERBOSE),1) 130 Q = 131else 132 Q = @ 133endif 134 135# Disable command line variables (CFLAGS) overide from top 136# level Makefile (perf), otherwise build Makefile will get 137# the same command line setup. 138MAKEOVERRIDES= 139 140all: 141 142export srctree OUTPUT CC LD CFLAGS V 143include $(srctree)/tools/build/Makefile.include 144 145BPF_IN := $(OUTPUT)libbpf-in.o 146LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE)) 147 148CMD_TARGETS = $(LIB_FILE) 149 150TARGETS = $(CMD_TARGETS) 151 152all: fixdep $(VERSION_FILES) all_cmd 153 154all_cmd: $(CMD_TARGETS) 155 156$(BPF_IN): force elfdep bpfdep 157 @(test -f ../../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \ 158 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \ 159 echo "Warning: tools/include/uapi/linux/bpf.h differs from kernel" >&2 )) || true 160 @(test -f ../../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \ 161 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \ 162 echo "Warning: tools/include/uapi/linux/bpf_common.h differs from kernel" >&2 )) || true 163 $(Q)$(MAKE) $(build)=libbpf 164 165$(OUTPUT)libbpf.so: $(BPF_IN) 166 $(QUIET_LINK)$(CC) --shared $^ -o $@ 167 168$(OUTPUT)libbpf.a: $(BPF_IN) 169 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^ 170 171define update_dir 172 (echo $1 > $@.tmp; \ 173 if [ -r $@ ] && cmp -s $@ $@.tmp; then \ 174 rm -f $@.tmp; \ 175 else \ 176 echo ' UPDATE $@'; \ 177 mv -f $@.tmp $@; \ 178 fi); 179endef 180 181define do_install 182 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ 183 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ 184 fi; \ 185 $(INSTALL) $1 '$(DESTDIR_SQ)$2' 186endef 187 188install_lib: all_cmd 189 $(call QUIET_INSTALL, $(LIB_FILE)) \ 190 $(call do_install,$(LIB_FILE),$(libdir_SQ)) 191 192install: install_lib 193 194### Cleaning rules 195 196config-clean: 197 $(call QUIET_CLEAN, config) 198 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null 199 200clean: 201 $(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d .*.cmd \ 202 $(RM) LIBBPF-CFLAGS 203 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf 204 205 206 207PHONY += force elfdep bpfdep 208force: 209 210elfdep: 211 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit -1 ; fi 212 213bpfdep: 214 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit -1 ; fi 215 216# Declare the contents of the .PHONY variable as phony. We keep that 217# information in a variable so we can use it in if_changed and friends. 218.PHONY: $(PHONY) 219