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
  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.
  15 define allow-override
  16   $(if $(or $(findstring environment,$(origin $(1))),\
  17             $(findstring command line,$(origin $(1)))),,\
  18     $(eval $(1) = $(2)))
  19 endef
  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
  25 INSTALL = 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.
  31 DESTDIR ?=
  32 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
  33
  34 LP64 := $(shell echo __LP64__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1)
  35 ifeq ($(LP64), 1)
  36   libdir_relative = lib64
  37 else
  38   libdir_relative = lib
  39 endif
  40
  41 prefix ?= /usr/local
  42 libdir = $(prefix)/$(libdir_relative)
  43 man_dir = $(prefix)/share/man
  44 man_dir_SQ = '$(subst ','\'',$(man_dir))'
  45
  46 export man_dir man_dir_SQ INSTALL
  47 export DESTDIR DESTDIR_SQ
  48
  49 include ../../scripts/Makefile.include
  50
  51 # copy a bit from Linux kbuild
  52
  53 ifeq ("$(origin V)", "command line")
  54   VERBOSE = $(V)
  55 endif
  56 ifndef VERBOSE
  57   VERBOSE = 0
  58 endif
  59
  60 ifeq ($(srctree),)
  61 srctree := $(patsubst %/,%,$(dir $(shell pwd)))
  62 srctree := $(patsubst %/,%,$(dir $(srctree)))
  63 srctree := $(patsubst %/,%,$(dir $(srctree)))
  64 #$(info Determined 'srctree' to be $(srctree))
  65 endif
  66
  67 FEATURE_USER = .libbpf
  68 FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf
  69 FEATURE_DISPLAY = libelf bpf
  70
  71 INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/arch/$(ARCH)/include/uapi -I$(srctree)/include/uapi
  72 FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
  73
  74 include $(srctree)/tools/build/Makefile.feature
  75
  76 export prefix libdir src obj
  77
  78 # Shell quotes
  79 libdir_SQ = $(subst ','\'',$(libdir))
  80 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
  81 plugin_dir_SQ = $(subst ','\'',$(plugin_dir))
  82
  83 LIB_FILE = libbpf.a libbpf.so
  84
  85 VERSION         = $(BPF_VERSION)
  86 PATCHLEVEL      = $(BPF_PATCHLEVEL)
  87 EXTRAVERSION    = $(BPF_EXTRAVERSION)
  88
  89 OBJ             = $@
  90 N               =
  91
  92 LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
  93
  94 # Set compile option CFLAGS
  95 ifdef EXTRA_CFLAGS
  96   CFLAGS := $(EXTRA_CFLAGS)
  97 else
  98   CFLAGS := -g -Wall
  99 endif
 100
 101 ifeq ($(feature-libelf-mmap), 1)
 102   override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
 103 endif
 104
 105 ifeq ($(feature-libelf-getphdrnum), 1)
 106   override CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT
 107 endif
 108
 109 # Append required CFLAGS
 110 override CFLAGS += $(EXTRA_WARNINGS)
 111 override CFLAGS += -Werror -Wall
 112 override CFLAGS += -fPIC
 113 override CFLAGS += $(INCLUDES)
 114
 115 ifeq ($(VERBOSE),1)
 116   Q =
 117 else
 118   Q = @
 119 endif
 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.
 124 MAKEOVERRIDES=
 125
 126 all:
 127
 128 export srctree OUTPUT CC LD CFLAGS V
 129 include $(srctree)/tools/build/Makefile.include
 130
 131 BPF_IN    := $(OUTPUT)libbpf-in.o
 132 LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
 133
 134 CMD_TARGETS = $(LIB_FILE)
 135
 136 TARGETS = $(CMD_TARGETS)
 137
 138 all: fixdep $(VERSION_FILES) all_cmd
 139
 140 all_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
 151 define 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 $@;                           \
 158    fi);
 159 endef
 160
 161 define do_install
 162         if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
 163                 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
 164         fi;                                             \
 165         $(INSTALL) $1 '$(DESTDIR_SQ)$2'
 166 endef
 167
 168 install_lib: all_cmd
 169         $(call QUIET_INSTALL, $(LIB_FILE)) \
 170                 $(call do_install,$(LIB_FILE),$(libdir_SQ))
 171
 172 install: install_lib
 173
 174 ### Cleaning rules
 175
 176 config-clean:
 177         $(call QUIET_CLEAN, config)
 178         $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
 179
 180 clean:
 181         $(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d \
 182                 $(RM) LIBBPF-CFLAGS
 183         $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
 184
 185
 186
 187 PHONY += force elfdep bpfdep
 188 force:
 189
 190 elfdep:
 191         @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit -1 ; fi
 192
 193 bpfdep:
 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)