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 RM ?= rm
   5 srctree := $(realpath $(srctree))
   6
   7 VERSION_SCRIPT := libbpf.map
   8 LIBBPF_VERSION := $(shell \
   9         grep -oE '^LIBBPF_([0-9.]+)' $(VERSION_SCRIPT) | \
  10         sort -rV | head -n1 | cut -d'_' -f2)
  11 LIBBPF_MAJOR_VERSION := $(word 1,$(subst ., ,$(LIBBPF_VERSION)))
  12 LIBBPF_MINOR_VERSION := $(word 2,$(subst ., ,$(LIBBPF_VERSION)))
  13
  14 MAKEFLAGS += --no-print-directory
  15
  16 # This will work when bpf is built in tools env. where srctree
  17 # isn't set and when invoked from selftests build, where srctree
  18 # is a ".". building_out_of_srctree is undefined for in srctree
  19 # builds
  20 ifndef building_out_of_srctree
  21 srctree := $(patsubst %/,%,$(dir $(CURDIR)))
  22 srctree := $(patsubst %/,%,$(dir $(srctree)))
  23 srctree := $(patsubst %/,%,$(dir $(srctree)))
  24 #$(info Determined 'srctree' to be $(srctree))
  25 endif
  26
  27 INSTALL = install
  28
  29 # Use DESTDIR for installing into a different root directory.
  30 # This is useful for building a package. The program will be
  31 # installed in this directory as if it was the root directory.
  32 # Then the build tool can move it later.
  33 DESTDIR ?=
  34 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
  35
  36 include $(srctree)/tools/scripts/Makefile.arch
  37
  38 ifeq ($(LP64), 1)
  39   libdir_relative = lib64
  40 else
  41   libdir_relative = lib
  42 endif
  43
  44 prefix ?= /usr/local
  45 libdir = $(prefix)/$(libdir_relative)
  46 man_dir = $(prefix)/share/man
  47 man_dir_SQ = '$(subst ','\'',$(man_dir))'
  48
  49 export man_dir man_dir_SQ INSTALL
  50 export DESTDIR DESTDIR_SQ
  51
  52 include $(srctree)/tools/scripts/Makefile.include
  53
  54 # copy a bit from Linux kbuild
  55
  56 ifeq ("$(origin V)", "command line")
  57   VERBOSE = $(V)
  58 endif
  59 ifndef VERBOSE
  60   VERBOSE = 0
  61 endif
  62
  63 INCLUDES = -I$(or $(OUTPUT),.) \
  64            -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi \
  65            -I$(srctree)/tools/arch/$(SRCARCH)/include
  66
  67 export prefix libdir src obj
  68
  69 # Shell quotes
  70 libdir_SQ = $(subst ','\'',$(libdir))
  71 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
  72
  73 OBJ             = $@
  74 N               =
  75
  76 LIB_TARGET      = libbpf.a libbpf.so.$(LIBBPF_VERSION)
  77 LIB_FILE        = libbpf.a libbpf.so*
  78 PC_FILE         = libbpf.pc
  79
  80 # Set compile option CFLAGS
  81 ifdef EXTRA_CFLAGS
  82   CFLAGS := $(EXTRA_CFLAGS)
  83 else
  84   CFLAGS := -g -O2
  85 endif
  86
  87 # Append required CFLAGS
  88 override CFLAGS += -std=gnu89
  89 override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
  90 override CFLAGS += -Werror -Wall
  91 override CFLAGS += $(INCLUDES)
  92 override CFLAGS += -fvisibility=hidden
  93 override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
  94 override CFLAGS += $(CLANG_CROSS_FLAGS)
  95
  96 # flags specific for shared library
  97 SHLIB_FLAGS := -DSHARED -fPIC
  98
  99 ifeq ($(VERBOSE),1)
 100   Q =
 101 else
 102   Q = @
 103 endif
 104
 105 # Disable command line variables (CFLAGS) override from top
 106 # level Makefile (perf), otherwise build Makefile will get
 107 # the same command line setup.
 108 MAKEOVERRIDES=
 109
 110 all:
 111
 112 OUTPUT ?= ./
 113 OUTPUT := $(abspath $(OUTPUT))/
 114 export srctree OUTPUT CC LD CFLAGS V
 115 include $(srctree)/tools/build/Makefile.include
 116
 117 SHARED_OBJDIR   := $(OUTPUT)sharedobjs/
 118 STATIC_OBJDIR   := $(OUTPUT)staticobjs/
 119 BPF_IN_SHARED   := $(SHARED_OBJDIR)libbpf-in.o
 120 BPF_IN_STATIC   := $(STATIC_OBJDIR)libbpf-in.o
 121 BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
 122 BPF_GENERATED   := $(BPF_HELPER_DEFS)
 123
 124 LIB_TARGET      := $(addprefix $(OUTPUT),$(LIB_TARGET))
 125 LIB_FILE        := $(addprefix $(OUTPUT),$(LIB_FILE))
 126 PC_FILE         := $(addprefix $(OUTPUT),$(PC_FILE))
 127
 128 TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
 129
 130 GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \
 131                            cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
 132                            sed 's/\[.*\]//' | \
 133                            awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
 134                            sort -u | wc -l)
 135 VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
 136                               sed 's/\[.*\]//' | \
 137                               awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
 138                               grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
 139
 140 CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
 141
 142 all: fixdep
 143         $(Q)$(MAKE) all_cmd
 144
 145 all_cmd: $(CMD_TARGETS) check
 146
 147 $(SHARED_OBJDIR) $(STATIC_OBJDIR):
 148         $(Q)mkdir -p $@
 149
 150 $(BPF_IN_SHARED): force $(BPF_GENERATED) | $(SHARED_OBJDIR)
 151         @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
 152         (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
 153         echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
 154         @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
 155         (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
 156         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
 157         @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
 158         (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
 159         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
 160         $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(SHARED_OBJDIR) $(SHARED_OBJDIR)fixdep
 161         $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
 162
 163 $(BPF_IN_STATIC): force $(BPF_GENERATED) | $(STATIC_OBJDIR)
 164         $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(STATIC_OBJDIR) $(STATIC_OBJDIR)fixdep
 165         $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
 166
 167 $(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
 168         $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \
 169                 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
 170
 171 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
 172
 173 $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)
 174         $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \
 175                 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
 176                 -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@
 177         @ln -sf $(@F) $(OUTPUT)libbpf.so
 178         @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
 179
 180 $(OUTPUT)libbpf.a: $(BPF_IN_STATIC)
 181         $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^
 182
 183 $(OUTPUT)libbpf.pc:
 184         $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
 185                 -e "s|@LIBDIR@|$(libdir_SQ)|" \
 186                 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \
 187                 < libbpf.pc.template > $@
 188
 189 check: check_abi check_version
 190
 191 check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)
 192         @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then  \
 193                 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)"        \
 194                      "($(GLOBAL_SYM_COUNT)) does NOT match with num of"  \
 195                      "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
 196                      "Please make sure all LIBBPF_API symbols are"       \
 197                      "versioned in $(VERSION_SCRIPT)." >&2;              \
 198                 readelf -s --wide $(BPF_IN_SHARED) |                     \
 199                     cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' |   \
 200                     sed 's/\[.*\]//' |                                   \
 201                     awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'|  \
 202                     sort -u > $(OUTPUT)libbpf_global_syms.tmp;           \
 203                 readelf --dyn-syms --wide $(OUTPUT)libbpf.so |           \
 204                     sed 's/\[.*\]//' |                                   \
 205                     awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'|  \
 206                     grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 |             \
 207                     sort -u > $(OUTPUT)libbpf_versioned_syms.tmp;        \
 208                 diff -u $(OUTPUT)libbpf_global_syms.tmp                  \
 209                      $(OUTPUT)libbpf_versioned_syms.tmp;                 \
 210                 rm $(OUTPUT)libbpf_global_syms.tmp                       \
 211                    $(OUTPUT)libbpf_versioned_syms.tmp;                   \
 212                 exit 1;                                                  \
 213         fi
 214
 215 HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
 216 HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
 217
 218 check_version: $(VERSION_SCRIPT) libbpf_version.h
 219         @if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then        \
 220                 echo "Error: libbpf major version mismatch detected: "         \
 221                      "'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2;  \
 222                 exit 1;                                                        \
 223         fi
 224         @if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then        \
 225                 echo "Error: libbpf minor version mismatch detected: "         \
 226                      "'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2;  \
 227                 exit 1;                                                        \
 228         fi
 229
 230 define do_install_mkdir
 231         if [ ! -d '$(DESTDIR_SQ)$1' ]; then             \
 232                 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
 233         fi
 234 endef
 235
 236 define do_install
 237         if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
 238                 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
 239         fi;                                             \
 240         $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
 241 endef
 242
 243 install_lib: all_cmd
 244         $(call QUIET_INSTALL, $(LIB_TARGET)) \
 245                 $(call do_install_mkdir,$(libdir_SQ)); \
 246                 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
 247
 248 SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h             \
 249             bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h         \
 250             skel_internal.h libbpf_version.h usdt.bpf.h
 251 GEN_HDRS := $(BPF_GENERATED)
 252
 253 INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf
 254 INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS))
 255 INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS)))
 256
 257 $(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h
 258         $(call QUIET_INSTALL, $@) \
 259                 $(call do_install,$<,$(prefix)/include/bpf,644)
 260
 261 $(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h
 262         $(call QUIET_INSTALL, $@) \
 263                 $(call do_install,$<,$(prefix)/include/bpf,644)
 264
 265 install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS)
 266         $(call QUIET_INSTALL, libbpf_headers)
 267
 268 install_pkgconfig: $(PC_FILE)
 269         $(call QUIET_INSTALL, $(PC_FILE)) \
 270                 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
 271
 272 install: install_lib install_pkgconfig install_headers
 273
 274 clean: fixdep-clean
 275         $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS)                 \
 276                 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED)                \
 277                 $(SHARED_OBJDIR) $(STATIC_OBJDIR)                            \
 278                 $(addprefix $(OUTPUT),                                       \
 279                             *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
 280
 281 PHONY += force cscope tags check check_abi check_version
 282 force:
 283
 284 cscope:
 285         ls *.c *.h > cscope.files
 286         cscope -b -q -I $(srctree)/include -f cscope.out
 287
 288 tags:
 289         $(RM) -f TAGS tags
 290         ls *.c *.h | xargs $(TAGS_PROG) -a
 291
 292 # Declare the contents of the .PHONY variable as phony.  We keep that
 293 # information in a variable so we can use it in if_changed and friends.
 294 .PHONY: $(PHONY)
 295
 296 # Delete partially updated (corrupted) files on error
 297 .DELETE_ON_ERROR:
 298
 299 help:
 300         @echo 'libbpf common targets:'
 301         @echo '  HINT: use "V=1" to enable verbose build'
 302         @echo '  all     - build libraries and pkgconfig'
 303         @echo '  clean   - remove all generated files'
 304         @echo '  check   - check ABI and version info'
 305         @echo ''
 306         @echo 'libbpf install targets:'
 307         @echo '  HINT: use "prefix"(defaults to "/usr/local") or "DESTDIR" (defaults to "/")'
 308         @echo '        to adjust target destination, e.g. "make prefix=/usr/local install"'
 309         @echo '  install          - build and install all headers, libraries and pkgconfig'
 310         @echo '  install_headers  - install only headers to include/bpf'
 311         @echo ''
 312         @echo 'libbpf make targets:'
 313         @echo '  tags    - use ctags to make tag information for source code browsing'
 314         @echo '  cscope  - use cscope to make interactive source code browsing database'