tools/lib/bpf/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Most of this file is copied from tools/lib/traceevent/Makefile
   3
   4 BPF_VERSION = 0
   5 BPF_PATCHLEVEL = 0
   6 BPF_EXTRAVERSION = 1
   7
   8 MAKEFLAGS += --no-print-directory
   9
  10 ifeq ($(srctree),)
  11 srctree := $(patsubst %/,%,$(dir $(CURDIR)))
  12 srctree := $(patsubst %/,%,$(dir $(srctree)))
  13 srctree := $(patsubst %/,%,$(dir $(srctree)))
  14 #$(info Determined 'srctree' to be $(srctree))
  15 endif
  16
  17 # Makefiles suck: This macro sets a default value of $(2) for the
  18 # variable named by $(1), unless the variable has been set by
  19 # environment or command line. This is necessary for CC and AR
  20 # because make sets default values, so the simpler ?= approach
  21 # won't work as expected.
  22 define allow-override
  23   $(if $(or $(findstring environment,$(origin $(1))),\
  24             $(findstring command line,$(origin $(1)))),,\
  25     $(eval $(1) = $(2)))
  26 endef
  27
  28 # Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
  29 $(call allow-override,CC,$(CROSS_COMPILE)gcc)
  30 $(call allow-override,AR,$(CROSS_COMPILE)ar)
  31
  32 INSTALL = install
  33
  34 # Use DESTDIR for installing into a different root directory.
  35 # This is useful for building a package. The program will be
  36 # installed in this directory as if it was the root directory.
  37 # Then the build tool can move it later.
  38 DESTDIR ?=
  39 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
  40
  41 include $(srctree)/tools/scripts/Makefile.arch
  42
  43 ifeq ($(LP64), 1)
  44   libdir_relative = lib64
  45 else
  46   libdir_relative = lib
  47 endif
  48
  49 prefix ?= /usr/local
  50 libdir = $(prefix)/$(libdir_relative)
  51 man_dir = $(prefix)/share/man
  52 man_dir_SQ = '$(subst ','\'',$(man_dir))'
  53
  54 export man_dir man_dir_SQ INSTALL
  55 export DESTDIR DESTDIR_SQ
  56
  57 include ../../scripts/Makefile.include
  58
  59 # copy a bit from Linux kbuild
  60
  61 ifeq ("$(origin V)", "command line")
  62   VERBOSE = $(V)
  63 endif
  64 ifndef VERBOSE
  65   VERBOSE = 0
  66 endif
  67
  68 FEATURE_USER = .libbpf
  69 FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf
  70 FEATURE_DISPLAY = libelf bpf
  71
  72 INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
  73 FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
  74
  75 check_feat := 1
  76 NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
  77 ifdef MAKECMDGOALS
  78 ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
  79   check_feat := 0
  80 endif
  81 endif
  82
  83 ifeq ($(check_feat),1)
  84 ifeq ($(FEATURES_DUMP),)
  85 include $(srctree)/tools/build/Makefile.feature
  86 else
  87 include $(FEATURES_DUMP)
  88 endif
  89 endif
  90
  91 export prefix libdir src obj
  92
  93 # Shell quotes
  94 libdir_SQ = $(subst ','\'',$(libdir))
  95 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
  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) override 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 all_cmd
 153
 154 all_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: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&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: Kernel ABI header at 'tools/include/uapi/linux/bpf_common.h' differs from latest version at 'include/uapi/linux/bpf_common.h'" >&2 )) || true
 163         @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
 164         (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
 165         echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
 166         @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
 167         (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
 168         echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_link.h' differs from latest version at 'include/uapi/linux/if_link.h'" >&2 )) || true
 169         $(Q)$(MAKE) $(build)=libbpf
 170
 171 $(OUTPUT)libbpf.so: $(BPF_IN)
 172         $(QUIET_LINK)$(CC) --shared $^ -o $@
 173
 174 $(OUTPUT)libbpf.a: $(BPF_IN)
 175         $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
 176
 177 define do_install
 178         if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
 179                 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
 180         fi;                                             \
 181         $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
 182 endef
 183
 184 install_lib: all_cmd
 185         $(call QUIET_INSTALL, $(LIB_FILE)) \
 186                 $(call do_install,$(LIB_FILE),$(libdir_SQ))
 187
 188 install_headers:
 189         $(call QUIET_INSTALL, headers) \
 190                 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \
 191                 $(call do_install,libbpf.h,$(prefix)/include/bpf,644);
 192
 193 install: install_lib
 194
 195 ### Cleaning rules
 196
 197 config-clean:
 198         $(call QUIET_CLEAN, config)
 199         $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
 200
 201 clean:
 202         $(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so .*.d .*.cmd \
 203                 $(RM) LIBBPF-CFLAGS
 204         $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
 205
 206
 207
 208 PHONY += force elfdep bpfdep
 209 force:
 210
 211 elfdep:
 212         @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
 213
 214 bpfdep:
 215         @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
 216
 217 # Declare the contents of the .PHONY variable as phony.  We keep that
 218 # information in a variable so we can use it in if_changed and friends.
 219 .PHONY: $(PHONY)