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 = 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 $(srctree))
  15 endif
  16
  17 INSTALL = install
  18
  19 # Use DESTDIR for installing into a different root directory.
  20 # This is useful for building a package. The program will be
  21 # installed in this directory as if it was the root directory.
  22 # Then the build tool can move it later.
  23 DESTDIR ?=
  24 DESTDIR_SQ = '$(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 LIB_FILE = libbpf.a libbpf.so
  83
  84 VERSION         = $(BPF_VERSION)
  85 PATCHLEVEL      = $(BPF_PATCHLEVEL)
  86 EXTRAVERSION    = $(BPF_EXTRAVERSION)
  87
  88 OBJ             = $@
  89 N               =
  90
  91 LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
  92
  93 # Set compile option CFLAGS
  94 ifdef EXTRA_CFLAGS
  95   CFLAGS := $(EXTRA_CFLAGS)
  96 else
  97   CFLAGS := -g -Wall
  98 endif
  99
 100 ifeq ($(feature-libelf-mmap), 1)
 101   override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
 102 endif
 103
 104 ifeq ($(feature-reallocarray), 0)
 105   override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
 106 endif
 107
 108 # Append required CFLAGS
 109 override CFLAGS += $(EXTRA_WARNINGS)
 110 override CFLAGS += -Werror -Wall
 111 override CFLAGS += -fPIC
 112 override CFLAGS += $(INCLUDES)
 113 override CFLAGS += -fvisibility=hidden
 114
 115 ifeq ($(VERBOSE),1)
 116   Q =
 117 else
 118   Q = @
 119 endif
 120
 121 # Disable command line variables (CFLAGS) override from top
 122 # level Makefile (perf), otherwise build Makefile will get
 123 # the same command line setup.
 124 MAKEOVERRIDES=
 125
 126 all:
 127
 128 export srctree OUTPUT CC LD CFLAGS V
 129 include $(srctree)/tools/build/Makefile.include
 130
 131 BPF_IN    := $(OUTPUT)libbpf-in.o
 132 LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
 133 VERSION_SCRIPT := libbpf.map
 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_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: $(BPF_IN)
 174         $(QUIET_LINK)$(CC) --shared -Wl,--version-script=$(VERSION_SCRIPT) \
 175                 $^ -o $@
 176
 177 $(OUTPUT)libbpf.a: $(BPF_IN)
 178         $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
 179
 180 $(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a
 181         $(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@
 182
 183 check: check_abi
 184
 185 check_abi: $(OUTPUT)libbpf.so
 186         @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then  \
 187                 echo "Warning: Num of global symbols in $(BPF_IN)"       \
 188                      "($(GLOBAL_SYM_COUNT)) does NOT match with num of"  \
 189                      "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
 190                      "Please make sure all LIBBPF_API symbols are"       \
 191                      "versioned in $(VERSION_SCRIPT)." >&2;              \
 192                 exit 1;                                                  \
 193         fi
 194
 195 define do_install
 196         if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
 197                 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
 198         fi;                                             \
 199         $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
 200 endef
 201
 202 install_lib: all_cmd
 203         $(call QUIET_INSTALL, $(LIB_FILE)) \
 204                 $(call do_install,$(LIB_FILE),$(libdir_SQ))
 205
 206 install_headers:
 207         $(call QUIET_INSTALL, headers) \
 208                 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \
 209                 $(call do_install,libbpf.h,$(prefix)/include/bpf,644);
 210                 $(call do_install,btf.h,$(prefix)/include/bpf,644);
 211
 212 install: install_lib
 213
 214 ### Cleaning rules
 215
 216 config-clean:
 217         $(call QUIET_CLEAN, config)
 218         $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
 219
 220 clean:
 221         $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
 222                 *.o *~ *.a *.so .*.d .*.cmd LIBBPF-CFLAGS
 223         $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
 224
 225
 226
 227 PHONY += force elfdep bpfdep
 228 force:
 229
 230 elfdep:
 231         @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
 232
 233 bpfdep:
 234         @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
 235
 236 # Declare the contents of the .PHONY variable as phony.  We keep that
 237 # information in a variable so we can use it in if_changed and friends.
 238 .PHONY: $(PHONY)