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 = 2
   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
  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-reallocarray), 0)
 106   override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
 107 endif
 108
 109 # Append required CFLAGS
 110 override CFLAGS += $(EXTRA_WARNINGS)
 111 override CFLAGS += -Werror -Wall
 112 override CFLAGS += -fPIC
 113 override CFLAGS += $(INCLUDES)
 114 override CFLAGS += -fvisibility=hidden
 115
 116 ifeq ($(VERBOSE),1)
 117   Q =
 118 else
 119   Q = @
 120 endif
 121
 122 # Disable command line variables (CFLAGS) override from top
 123 # level Makefile (perf), otherwise build Makefile will get
 124 # the same command line setup.
 125 MAKEOVERRIDES=
 126
 127 all:
 128
 129 export srctree OUTPUT CC LD CFLAGS V
 130 include $(srctree)/tools/build/Makefile.include
 131
 132 BPF_IN          := $(OUTPUT)libbpf-in.o
 133 VERSION_SCRIPT  := libbpf.map
 134
 135 LIB_TARGET      := $(addprefix $(OUTPUT),$(LIB_TARGET))
 136 LIB_FILE        := $(addprefix $(OUTPUT),$(LIB_FILE))
 137
 138 GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN) | \
 139                            awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print s}')
 140 VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so | \
 141                               grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
 142
 143 CMD_TARGETS = $(LIB_TARGET)
 144
 145 CXX_TEST_TARGET = $(OUTPUT)test_libbpf
 146
 147 ifeq ($(feature-cxx), 1)
 148         CMD_TARGETS += $(CXX_TEST_TARGET)
 149 endif
 150
 151 TARGETS = $(CMD_TARGETS)
 152
 153 all: fixdep
 154         $(Q)$(MAKE) all_cmd
 155
 156 all_cmd: $(CMD_TARGETS) check
 157
 158 $(BPF_IN): force elfdep bpfdep
 159         @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
 160         (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
 161         echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
 162         @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
 163         (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
 164         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
 165         @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
 166         (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
 167         echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
 168         @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
 169         (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
 170         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
 171         @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
 172         (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
 173         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
 174         $(Q)$(MAKE) $(build)=libbpf
 175
 176 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
 177
 178 $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN)
 179         $(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(VERSION) \
 180                                     -Wl,--version-script=$(VERSION_SCRIPT) $^ -o $@
 181         @ln -sf $(@F) $(OUTPUT)libbpf.so
 182         @ln -sf $(@F) $(OUTPUT)libbpf.so.$(VERSION)
 183
 184 $(OUTPUT)libbpf.a: $(BPF_IN)
 185         $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
 186
 187 $(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a
 188         $(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@
 189
 190 check: check_abi
 191
 192 check_abi: $(OUTPUT)libbpf.so
 193         @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then  \
 194                 echo "Warning: Num of global symbols in $(BPF_IN)"       \
 195                      "($(GLOBAL_SYM_COUNT)) does NOT match with num of"  \
 196                      "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
 197                      "Please make sure all LIBBPF_API symbols are"       \
 198                      "versioned in $(VERSION_SCRIPT)." >&2;              \
 199                 exit 1;                                                  \
 200         fi
 201
 202 define do_install_mkdir
 203         if [ ! -d '$(DESTDIR_SQ)$1' ]; then             \
 204                 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
 205         fi
 206 endef
 207
 208 define do_install
 209         if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
 210                 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
 211         fi;                                             \
 212         $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
 213 endef
 214
 215 install_lib: all_cmd
 216         $(call QUIET_INSTALL, $(LIB_TARGET)) \
 217                 $(call do_install_mkdir,$(libdir_SQ)); \
 218                 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
 219
 220 install_headers:
 221         $(call QUIET_INSTALL, headers) \
 222                 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \
 223                 $(call do_install,libbpf.h,$(prefix)/include/bpf,644);
 224                 $(call do_install,btf.h,$(prefix)/include/bpf,644);
 225
 226 install: install_lib
 227
 228 ### Cleaning rules
 229
 230 config-clean:
 231         $(call QUIET_CLEAN, config)
 232         $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
 233
 234 clean:
 235         $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
 236                 *.o *~ *.a *.so *.so.$(VERSION) .*.d .*.cmd LIBBPF-CFLAGS
 237         $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
 238
 239
 240
 241 PHONY += force elfdep bpfdep
 242 force:
 243
 244 elfdep:
 245         @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
 246
 247 bpfdep:
 248         @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
 249
 250 # Declare the contents of the .PHONY variable as phony.  We keep that
 251 # information in a variable so we can use it in if_changed and friends.
 252 .PHONY: $(PHONY)