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 9 10# Makefiles suck: This macro sets a default value of $(2) for the 11# variable named by $(1), unless the variable has been set by 12# environment or command line. This is necessary for CC and AR 13# because make sets default values, so the simpler ?= approach 14# won't work as expected. 15define allow-override 16 $(if $(or $(findstring environment,$(origin $(1))),\ 17 $(findstring command line,$(origin $(1)))),,\ 18 $(eval $(1) = $(2))) 19endef 20 21# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix. 22$(call allow-override,CC,$(CROSS_COMPILE)gcc) 23$(call allow-override,AR,$(CROSS_COMPILE)ar) 24 25INSTALL = install 26 27# Use DESTDIR for installing into a different root directory. 28# This is useful for building a package. The program will be 29# installed in this directory as if it was the root directory. 30# Then the build tool can move it later. 31DESTDIR ?= 32DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))' 33 34LP64 := $(shell echo __LP64__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1) 35ifeq ($(LP64), 1) 36 libdir_relative = lib64 37else 38 libdir_relative = lib 39endif 40 41prefix ?= /usr/local 42libdir = $(prefix)/$(libdir_relative) 43man_dir = $(prefix)/share/man 44man_dir_SQ = '$(subst ','\'',$(man_dir))' 45 46export man_dir man_dir_SQ INSTALL 47export DESTDIR DESTDIR_SQ 48 49include ../../scripts/Makefile.include 50 51# copy a bit from Linux kbuild 52 53ifeq ("$(origin V)", "command line") 54 VERBOSE = $(V) 55endif 56ifndef VERBOSE 57 VERBOSE = 0 58endif 59 60ifeq ($(srctree),) 61srctree := $(patsubst %/,%,$(dir $(shell pwd))) 62srctree := $(patsubst %/,%,$(dir $(srctree))) 63srctree := $(patsubst %/,%,$(dir $(srctree))) 64#$(info Determined 'srctree' to be $(srctree)) 65endif 66 67FEATURE_USER = .libbpf 68FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf 69FEATURE_DISPLAY = libelf bpf 70 71INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/arch/$(ARCH)/include/uapi -I$(srctree)/include/uapi 72FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES) 73 74include $(srctree)/tools/build/Makefile.feature 75 76export prefix libdir src obj 77 78# Shell quotes 79libdir_SQ = $(subst ','\'',$(libdir)) 80libdir_relative_SQ = $(subst ','\'',$(libdir_relative)) 81plugin_dir_SQ = $(subst ','\'',$(plugin_dir)) 82 83LIB_FILE = libbpf.a libbpf.so 84 85VERSION = $(BPF_VERSION) 86PATCHLEVEL = $(BPF_PATCHLEVEL) 87EXTRAVERSION = $(BPF_EXTRAVERSION) 88 89OBJ = $@ 90N = 91 92LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION) 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-libelf-getphdrnum), 1) 106 override CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT 107endif 108 109# Append required CFLAGS 110override CFLAGS += $(EXTRA_WARNINGS) 111override CFLAGS += -Werror -Wall 112override CFLAGS += -fPIC 113override CFLAGS += $(INCLUDES) 114 115ifeq ($(VERBOSE),1) 116 Q = 117else 118 Q = @ 119endif 120 121# Disable command line variables (CFLAGS) overide 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)) 133 134CMD_TARGETS = $(LIB_FILE) 135 136TARGETS = $(CMD_TARGETS) 137 138all: fixdep $(VERSION_FILES) all_cmd 139 140all_cmd: $(CMD_TARGETS) 141 142$(BPF_IN): force elfdep bpfdep 143 $(Q)$(MAKE) $(build)=libbpf 144 145$(OUTPUT)libbpf.so: $(BPF_IN) 146 $(QUIET_LINK)$(CC) --shared $^ -o $@ 147 148$(OUTPUT)libbpf.a: $(BPF_IN) 149 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^ 150 151define update_dir 152 (echo $1 > $@.tmp; \ 153 if [ -r $@ ] && cmp -s $@ $@.tmp; then \ 154 rm -f $@.tmp; \ 155 else \ 156 echo ' UPDATE $@'; \ 157 mv -f $@.tmp $@; \ 158 fi); 159endef 160 161define do_install 162 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ 163 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ 164 fi; \ 165 $(INSTALL) $1 '$(DESTDIR_SQ)$2' 166endef 167 168install_lib: all_cmd 169 $(call QUIET_INSTALL, $(LIB_FILE)) \ 170 $(call do_install,$(LIB_FILE),$(libdir_SQ)) 171 172install: install_lib 173 174### Cleaning rules 175 176config-clean: 177 $(call QUIET_CLEAN, config) 178 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null 179 180clean: 181 $(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d \ 182 $(RM) LIBBPF-CFLAGS 183 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf 184 185 186 187PHONY += force elfdep bpfdep 188force: 189 190elfdep: 191 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit -1 ; fi 192 193bpfdep: 194 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit -1 ; fi 195 196# Declare the contents of the .PHONY variable as phony. We keep that 197# information in a variable so we can use it in if_changed and friends. 198.PHONY: $(PHONY) 199