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 $(srctree)) 65endif 66 67FEATURE_DISPLAY = libelf libelf-getphdrnum libelf-mmap bpf 68FEATURE_TESTS = libelf bpf 69 70INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/arch/$(ARCH)/include/uapi -I$(srctree)/include/uapi 71FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES) 72 73include $(srctree)/tools/build/Makefile.feature 74 75export prefix libdir src obj 76 77# Shell quotes 78libdir_SQ = $(subst ','\'',$(libdir)) 79libdir_relative_SQ = $(subst ','\'',$(libdir_relative)) 80plugin_dir_SQ = $(subst ','\'',$(plugin_dir)) 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-libelf-getphdrnum), 1) 105 override CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT 106endif 107 108# Append required CFLAGS 109override CFLAGS += $(EXTRA_WARNINGS) 110override CFLAGS += -Werror -Wall 111override CFLAGS += -fPIC 112override CFLAGS += $(INCLUDES) 113 114ifeq ($(VERBOSE),1) 115 Q = 116else 117 Q = @ 118endif 119 120# Disable command line variables (CFLAGS) overide from top 121# level Makefile (perf), otherwise build Makefile will get 122# the same command line setup. 123MAKEOVERRIDES= 124 125export srctree OUTPUT CC LD CFLAGS V 126build := -f $(srctree)/tools/build/Makefile.build dir=. obj 127 128BPF_IN := $(OUTPUT)libbpf-in.o 129LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE)) 130 131CMD_TARGETS = $(LIB_FILE) 132 133TARGETS = $(CMD_TARGETS) 134 135all: $(VERSION_FILES) all_cmd 136 137all_cmd: $(CMD_TARGETS) 138 139$(BPF_IN): force elfdep bpfdep 140 $(Q)$(MAKE) $(build)=libbpf 141 142$(OUTPUT)libbpf.so: $(BPF_IN) 143 $(QUIET_LINK)$(CC) --shared $^ -o $@ 144 145$(OUTPUT)libbpf.a: $(BPF_IN) 146 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^ 147 148define update_dir 149 (echo $1 > $@.tmp; \ 150 if [ -r $@ ] && cmp -s $@ $@.tmp; then \ 151 rm -f $@.tmp; \ 152 else \ 153 echo ' UPDATE $@'; \ 154 mv -f $@.tmp $@; \ 155 fi); 156endef 157 158define do_install 159 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ 160 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ 161 fi; \ 162 $(INSTALL) $1 '$(DESTDIR_SQ)$2' 163endef 164 165install_lib: all_cmd 166 $(call QUIET_INSTALL, $(LIB_FILE)) \ 167 $(call do_install,$(LIB_FILE),$(libdir_SQ)) 168 169install: install_lib 170 171### Cleaning rules 172 173config-clean: 174 $(call QUIET_CLEAN, config) 175 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null 176 177clean: 178 $(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d \ 179 $(RM) LIBBPF-CFLAGS 180 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP 181 182 183 184PHONY += force elfdep bpfdep 185force: 186 187elfdep: 188 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit -1 ; fi 189 190bpfdep: 191 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit -1 ; fi 192 193# Declare the contents of the .PHONY variable as phony. We keep that 194# information in a variable so we can use it in if_changed and friends. 195.PHONY: $(PHONY) 196