tools/lib/bpf/Makefile

   1 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
   2 # Most of this file is copied from tools/lib/traceevent/Makefile
   3
   4 LIBBPF_VERSION := $(shell \
   5         grep -oE '^LIBBPF_([0-9.]+)' libbpf.map | \
   6         sort -rV | head -n1 | cut -d'_' -f2)
   7 LIBBPF_MAJOR_VERSION := $(firstword $(subst ., ,$(LIBBPF_VERSION)))
   8
   9 MAKEFLAGS += --no-print-directory
  10
  11 ifeq ($(srctree),)
  12 srctree := $(patsubst %/,%,$(dir $(CURDIR)))
  13 srctree := $(patsubst %/,%,$(dir $(srctree)))
  14 srctree := $(patsubst %/,%,$(dir $(srctree)))
  15 #$(info Determined 'srctree' to be $(srctree))
  16 endif
  17
  18 INSTALL = install
  19
  20 # Use DESTDIR for installing into a different root directory.
  21 # This is useful for building a package. The program will be
  22 # installed in this directory as if it was the root directory.
  23 # Then the build tool can move it later.
  24 DESTDIR ?=
  25 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
  26
  27 include $(srctree)/tools/scripts/Makefile.arch
  28
  29 ifeq ($(LP64), 1)
  30   libdir_relative = lib64
  31 else
  32   libdir_relative = lib
  33 endif
  34
  35 prefix ?= /usr/local
  36 libdir = $(prefix)/$(libdir_relative)
  37 man_dir = $(prefix)/share/man
  38 man_dir_SQ = '$(subst ','\'',$(man_dir))'
  39
  40 export man_dir man_dir_SQ INSTALL
  41 export DESTDIR DESTDIR_SQ
  42
  43 include $(srctree)/tools/scripts/Makefile.include
  44
  45 # copy a bit from Linux kbuild
  46
  47 ifeq ("$(origin V)", "command line")
  48   VERBOSE = $(V)
  49 endif
  50 ifndef VERBOSE
  51   VERBOSE = 0
  52 endif
  53
  54 FEATURE_USER = .libbpf
  55 FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx
  56 FEATURE_DISPLAY = libelf bpf
  57
  58 INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
  59 FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
  60
  61 check_feat := 1
  62 NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
  63 ifdef MAKECMDGOALS
  64 ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
  65   check_feat := 0
  66 endif
  67 endif
  68
  69 ifeq ($(check_feat),1)
  70 ifeq ($(FEATURES_DUMP),)
  71 include $(srctree)/tools/build/Makefile.feature
  72 else
  73 include $(FEATURES_DUMP)
  74 endif
  75 endif
  76
  77 export prefix libdir src obj
  78
  79 # Shell quotes
  80 libdir_SQ = $(subst ','\'',$(libdir))
  81 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
  82
  83 OBJ             = $@
  84 N               =
  85
  86 LIB_TARGET      = libbpf.a libbpf.so.$(LIBBPF_VERSION)
  87 LIB_FILE        = libbpf.a libbpf.so*
  88 PC_FILE         = libbpf.pc
  89
  90 # Set compile option CFLAGS
  91 ifdef EXTRA_CFLAGS
  92   CFLAGS := $(EXTRA_CFLAGS)
  93 else
  94   CFLAGS := -g -Wall
  95 endif
  96
  97 ifeq ($(feature-libelf-mmap), 1)
  98   override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
  99 endif
 100
 101 ifeq ($(feature-reallocarray), 0)
 102   override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
 103 endif
 104
 105 # Append required CFLAGS
 106 override CFLAGS += $(EXTRA_WARNINGS)
 107 override CFLAGS += -Werror -Wall
 108 override CFLAGS += -fPIC
 109 override CFLAGS += $(INCLUDES)
 110 override CFLAGS += -fvisibility=hidden
 111
 112 ifeq ($(VERBOSE),1)
 113   Q =
 114 else
 115   Q = @
 116 endif
 117
 118 # Disable command line variables (CFLAGS) override from top
 119 # level Makefile (perf), otherwise build Makefile will get
 120 # the same command line setup.
 121 MAKEOVERRIDES=
 122
 123 all:
 124
 125 export srctree OUTPUT CC LD CFLAGS V
 126 include $(srctree)/tools/build/Makefile.include
 127
 128 BPF_IN          := $(OUTPUT)libbpf-in.o
 129 VERSION_SCRIPT  := libbpf.map
 130
 131 LIB_TARGET      := $(addprefix $(OUTPUT),$(LIB_TARGET))
 132 LIB_FILE        := $(addprefix $(OUTPUT),$(LIB_FILE))
 133 PC_FILE         := $(addprefix $(OUTPUT),$(PC_FILE))
 134
 135 GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN) | \
 136                            awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print s}')
 137 VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so | \
 138                               grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
 139
 140 CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
 141
 142 CXX_TEST_TARGET = $(OUTPUT)test_libbpf
 143
 144 ifeq ($(feature-cxx), 1)
 145         CMD_TARGETS += $(CXX_TEST_TARGET)
 146 endif
 147
 148 TARGETS = $(CMD_TARGETS)
 149
 150 all: fixdep
 151         $(Q)$(MAKE) all_cmd
 152
 153 all_cmd: $(CMD_TARGETS) check
 154
 155 $(BPF_IN): force elfdep bpfdep
 156         @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
 157         (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
 158         echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
 159         @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
 160         (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
 161         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
 162         @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
 163         (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
 164         echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
 165         @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
 166         (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
 167         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
 168         @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
 169         (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
 170         echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true
 171         $(Q)$(MAKE) $(build)=libbpf
 172
 173 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
 174
 175 $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN)
 176         $(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
 177                                     -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@
 178         @ln -sf $(@F) $(OUTPUT)libbpf.so
 179         @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
 180
 181 $(OUTPUT)libbpf.a: $(BPF_IN)
 182         $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
 183
 184 $(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a
 185         $(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@
 186
 187 $(OUTPUT)libbpf.pc:
 188         $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
 189                 -e "s|@LIBDIR@|$(libdir_SQ)|" \
 190                 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \
 191                 < libbpf.pc.template > $@
 192
 193 check: check_abi
 194
 195 check_abi: $(OUTPUT)libbpf.so
 196         @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then  \
 197                 echo "Warning: Num of global symbols in $(BPF_IN)"       \
 198                      "($(GLOBAL_SYM_COUNT)) does NOT match with num of"  \
 199                      "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
 200                      "Please make sure all LIBBPF_API symbols are"       \
 201                      "versioned in $(VERSION_SCRIPT)." >&2;              \
 202                 readelf -s --wide $(OUTPUT)libbpf-in.o |                 \
 203                     awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$8}'|   \
 204                     sort -u > $(OUTPUT)libbpf_global_syms.tmp;           \
 205                 readelf -s --wide $(OUTPUT)libbpf.so |                   \
 206                     grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 |             \
 207                     sort -u > $(OUTPUT)libbpf_versioned_syms.tmp;        \
 208                 diff -u $(OUTPUT)libbpf_global_syms.tmp                  \
 209                      $(OUTPUT)libbpf_versioned_syms.tmp;                 \
 210                 rm $(OUTPUT)libbpf_global_syms.tmp                       \
 211                    $(OUTPUT)libbpf_versioned_syms.tmp;                   \
 212                 exit 1;                                                  \
 213         fi
 214
 215 define do_install_mkdir
 216         if [ ! -d '$(DESTDIR_SQ)$1' ]; then             \
 217                 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
 218         fi
 219 endef
 220
 221 define do_install
 222         if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
 223                 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
 224         fi;                                             \
 225         $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
 226 endef
 227
 228 install_lib: all_cmd
 229         $(call QUIET_INSTALL, $(LIB_TARGET)) \
 230                 $(call do_install_mkdir,$(libdir_SQ)); \
 231                 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
 232
 233 install_headers:
 234         $(call QUIET_INSTALL, headers) \
 235                 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \
 236                 $(call do_install,libbpf.h,$(prefix)/include/bpf,644); \
 237                 $(call do_install,btf.h,$(prefix)/include/bpf,644); \
 238                 $(call do_install,libbpf_util.h,$(prefix)/include/bpf,644); \
 239                 $(call do_install,xsk.h,$(prefix)/include/bpf,644);
 240
 241 install_pkgconfig: $(PC_FILE)
 242         $(call QUIET_INSTALL, $(PC_FILE)) \
 243                 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
 244
 245 install: install_lib install_pkgconfig
 246
 247 ### Cleaning rules
 248
 249 config-clean:
 250         $(call QUIET_CLEAN, config)
 251         $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
 252
 253 clean:
 254         $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
 255                 *.o *~ *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) .*.d .*.cmd \
 256                 *.pc LIBBPF-CFLAGS
 257         $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
 258
 259
 260
 261 PHONY += force elfdep bpfdep
 262 force:
 263
 264 elfdep:
 265         @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
 266
 267 bpfdep:
 268         @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
 269
 270 # Declare the contents of the .PHONY variable as phony.  We keep that
 271 # information in a variable so we can use it in if_changed and friends.
 272 .PHONY: $(PHONY)