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