tools/lib/bpf/Makefile

   1 # Most of this file is copied from tools/lib/traceevent/Makefile
   2
   3 BPF_VERSION = 0
   4 BPF_PATCHLEVEL = 0
   5 BPF_EXTRAVERSION = 1
   6
   7 MAKEFLAGS += --no-print-directory
   8
   9 ifeq ($(srctree),)
  10 srctree := $(patsubst %/,%,$(dir $(shell pwd)))
  11 srctree := $(patsubst %/,%,$(dir $(srctree)))
  12 srctree := $(patsubst %/,%,$(dir $(srctree)))
  13 #$(info Determined 'srctree' to be $(srctree))
  14 endif
  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.
  21 define allow-override
  22   $(if $(or $(findstring environment,$(origin $(1))),\
  23             $(findstring command line,$(origin $(1)))),,\
  24     $(eval $(1) = $(2)))
  25 endef
  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
  31 INSTALL = 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.
  37 DESTDIR ?=
  38 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
  39
  40 include $(srctree)/tools/scripts/Makefile.arch
  41
  42 ifeq ($(LP64), 1)
  43   libdir_relative = lib64
  44 else
  45   libdir_relative = lib
  46 endif
  47
  48 prefix ?= /usr/local
  49 libdir = $(prefix)/$(libdir_relative)
  50 man_dir = $(prefix)/share/man
  51 man_dir_SQ = '$(subst ','\'',$(man_dir))'
  52
  53 export man_dir man_dir_SQ INSTALL
  54 export DESTDIR DESTDIR_SQ
  55
  56 include ../../scripts/Makefile.include
  57
  58 # copy a bit from Linux kbuild
  59
  60 ifeq ("$(origin V)", "command line")
  61   VERBOSE = $(V)
  62 endif
  63 ifndef VERBOSE
  64   VERBOSE = 0
  65 endif
  66
  67 FEATURE_USER = .libbpf
  68 FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf
  69 FEATURE_DISPLAY = libelf bpf
  70
  71 INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/arch/$(ARCH)/include/uapi -I$(srctree)/include/uapi
  72 FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
  73
  74 check_feat := 1
  75 NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
  76 ifdef MAKECMDGOALS
  77 ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
  78   check_feat := 0
  79 endif
  80 endif
  81
  82 ifeq ($(check_feat),1)
  83 ifeq ($(FEATURES_DUMP),)
  84 include $(srctree)/tools/build/Makefile.feature
  85 else
  86 include $(FEATURES_DUMP)
  87 endif
  88 endif
  89
  90 export prefix libdir src obj
  91
  92 # Shell quotes
  93 libdir_SQ = $(subst ','\'',$(libdir))
  94 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
  95 plugin_dir_SQ = $(subst ','\'',$(plugin_dir))
  96
  97 LIB_FILE = libbpf.a libbpf.so
  98
  99 VERSION         = $(BPF_VERSION)
 100 PATCHLEVEL      = $(BPF_PATCHLEVEL)
 101 EXTRAVERSION    = $(BPF_EXTRAVERSION)
 102
 103 OBJ             = $@
 104 N               =
 105
 106 LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
 107
 108 # Set compile option CFLAGS
 109 ifdef EXTRA_CFLAGS
 110   CFLAGS := $(EXTRA_CFLAGS)
 111 else
 112   CFLAGS := -g -Wall
 113 endif
 114
 115 ifeq ($(feature-libelf-mmap), 1)
 116   override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
 117 endif
 118
 119 ifeq ($(feature-libelf-getphdrnum), 1)
 120   override CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT
 121 endif
 122
 123 # Append required CFLAGS
 124 override CFLAGS += $(EXTRA_WARNINGS)
 125 override CFLAGS += -Werror -Wall
 126 override CFLAGS += -fPIC
 127 override CFLAGS += $(INCLUDES)
 128
 129 ifeq ($(VERBOSE),1)
 130   Q =
 131 else
 132   Q = @
 133 endif
 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.
 138 MAKEOVERRIDES=
 139
 140 all:
 141
 142 export srctree OUTPUT CC LD CFLAGS V
 143 include $(srctree)/tools/build/Makefile.include
 144
 145 BPF_IN    := $(OUTPUT)libbpf-in.o
 146 LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
 147
 148 CMD_TARGETS = $(LIB_FILE)
 149
 150 TARGETS = $(CMD_TARGETS)
 151
 152 all: fixdep $(VERSION_FILES) all_cmd
 153
 154 all_cmd: $(CMD_TARGETS)
 155
 156 $(BPF_IN): force elfdep bpfdep
 157         $(Q)$(MAKE) $(build)=libbpf
 158
 159 $(OUTPUT)libbpf.so: $(BPF_IN)
 160         $(QUIET_LINK)$(CC) --shared $^ -o $@
 161
 162 $(OUTPUT)libbpf.a: $(BPF_IN)
 163         $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
 164
 165 define update_dir
 166   (echo $1 > $@.tmp;                            \
 167    if [ -r $@ ] && cmp -s $@ $@.tmp; then       \
 168      rm -f $@.tmp;                              \
 169    else                                         \
 170      echo '  UPDATE                 $@';        \
 171      mv -f $@.tmp $@;                           \
 172    fi);
 173 endef
 174
 175 define do_install
 176         if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
 177                 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
 178         fi;                                             \
 179         $(INSTALL) $1 '$(DESTDIR_SQ)$2'
 180 endef
 181
 182 install_lib: all_cmd
 183         $(call QUIET_INSTALL, $(LIB_FILE)) \
 184                 $(call do_install,$(LIB_FILE),$(libdir_SQ))
 185
 186 install: install_lib
 187
 188 ### Cleaning rules
 189
 190 config-clean:
 191         $(call QUIET_CLEAN, config)
 192         $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
 193
 194 clean:
 195         $(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d .*.cmd \
 196                 $(RM) LIBBPF-CFLAGS
 197         $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
 198
 199
 200
 201 PHONY += force elfdep bpfdep
 202 force:
 203
 204 elfdep:
 205         @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit -1 ; fi
 206
 207 bpfdep:
 208         @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit -1 ; fi
 209
 210 # Declare the contents of the .PHONY variable as phony.  We keep that
 211 # information in a variable so we can use it in if_changed and friends.
 212 .PHONY: $(PHONY)