[thirdparty/kernel/stable.git] / tools / lib / bpf / Makefile

# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
# Most of this file is copied from tools/lib/traceevent/Makefile

BPF_VERSION = 0
BPF_PATCHLEVEL = 0
BPF_EXTRAVERSION = 2

MAKEFLAGS += --no-print-directory

ifeq ($(srctree),)
srctree := $(patsubst %/,%,$(dir $(CURDIR)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
#$(info Determined 'srctree' to be $(srctree))
endif

INSTALL = install

# Use DESTDIR for installing into a different root directory.
# This is useful for building a package. The program will be
# installed in this directory as if it was the root directory.
# Then the build tool can move it later.
DESTDIR ?=
DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'

include $(srctree)/tools/scripts/Makefile.arch

ifeq ($(LP64), 1)
  libdir_relative = lib64
else
  libdir_relative = lib
endif

prefix ?= /usr/local
libdir = $(prefix)/$(libdir_relative)
man_dir = $(prefix)/share/man
man_dir_SQ = '$(subst ','\'',$(man_dir))'

export man_dir man_dir_SQ INSTALL
export DESTDIR DESTDIR_SQ

include $(srctree)/tools/scripts/Makefile.include

# copy a bit from Linux kbuild

ifeq ("$(origin V)", "command line")
  VERBOSE = $(V)
endif
ifndef VERBOSE
  VERBOSE = 0
endif

FEATURE_USER = .libbpf
FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx
FEATURE_DISPLAY = libelf bpf

INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)

check_feat := 1
NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
ifdef MAKECMDGOALS
ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
  check_feat := 0
endif
endif

ifeq ($(check_feat),1)
ifeq ($(FEATURES_DUMP),)
include $(srctree)/tools/build/Makefile.feature
else
include $(FEATURES_DUMP)
endif
endif

export prefix libdir src obj

# Shell quotes
libdir_SQ = $(subst ','\'',$(libdir))
libdir_relative_SQ = $(subst ','\'',$(libdir_relative))

VERSION		= $(BPF_VERSION)
PATCHLEVEL	= $(BPF_PATCHLEVEL)
EXTRAVERSION	= $(BPF_EXTRAVERSION)

OBJ		= $@
N		=

LIBBPF_VERSION	= $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)

LIB_TARGET	= libbpf.a libbpf.so.$(LIBBPF_VERSION)
LIB_FILE	= libbpf.a libbpf.so*

# Set compile option CFLAGS
ifdef EXTRA_CFLAGS
  CFLAGS := $(EXTRA_CFLAGS)
else
  CFLAGS := -g -Wall
endif

ifeq ($(feature-libelf-mmap), 1)
  override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
endif

ifeq ($(feature-reallocarray), 0)
  override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
endif

# Append required CFLAGS
override CFLAGS += $(EXTRA_WARNINGS)
override CFLAGS += -Werror -Wall
override CFLAGS += -fPIC
override CFLAGS += $(INCLUDES)
override CFLAGS += -fvisibility=hidden

ifeq ($(VERBOSE),1)
  Q =
else
  Q = @
endif

# Disable command line variables (CFLAGS) override from top
# level Makefile (perf), otherwise build Makefile will get
# the same command line setup.
MAKEOVERRIDES=

all:

export srctree OUTPUT CC LD CFLAGS V
include $(srctree)/tools/build/Makefile.include

BPF_IN		:= $(OUTPUT)libbpf-in.o
VERSION_SCRIPT	:= libbpf.map

LIB_TARGET	:= $(addprefix $(OUTPUT),$(LIB_TARGET))
LIB_FILE	:= $(addprefix $(OUTPUT),$(LIB_FILE))

GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN) | \
			   awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print s}')
VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so | \
			      grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)

CMD_TARGETS = $(LIB_TARGET)

CXX_TEST_TARGET = $(OUTPUT)test_libbpf

ifeq ($(feature-cxx), 1)
	CMD_TARGETS += $(CXX_TEST_TARGET)
endif

TARGETS = $(CMD_TARGETS)

all: fixdep
	$(Q)$(MAKE) all_cmd

all_cmd: $(CMD_TARGETS) check

$(BPF_IN): force elfdep bpfdep
	@(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
	(diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
	echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
	@(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
	(diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
	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
	@(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
	(diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
	echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
	@(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
	(diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
	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
	@(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
	(diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
	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
	$(Q)$(MAKE) $(build)=libbpf

$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)

$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN)
	$(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(VERSION) \
				    -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@
	@ln -sf $(@F) $(OUTPUT)libbpf.so
	@ln -sf $(@F) $(OUTPUT)libbpf.so.$(VERSION)

$(OUTPUT)libbpf.a: $(BPF_IN)
	$(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^

$(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a
	$(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@

check: check_abi

check_abi: $(OUTPUT)libbpf.so
	@if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then	 \
		echo "Warning: Num of global symbols in $(BPF_IN)"	 \
		     "($(GLOBAL_SYM_COUNT)) does NOT match with num of"	 \
		     "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
		     "Please make sure all LIBBPF_API symbols are"	 \
		     "versioned in $(VERSION_SCRIPT)." >&2;		 \
		exit 1;							 \
	fi

define do_install_mkdir
	if [ ! -d '$(DESTDIR_SQ)$1' ]; then		\
		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1';	\
	fi
endef

define do_install
	if [ ! -d '$(DESTDIR_SQ)$2' ]; then		\
		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2';	\
	fi;						\
	$(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
endef

install_lib: all_cmd
	$(call QUIET_INSTALL, $(LIB_TARGET)) \
		$(call do_install_mkdir,$(libdir_SQ)); \
		cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)

install_headers:
	$(call QUIET_INSTALL, headers) \
		$(call do_install,bpf.h,$(prefix)/include/bpf,644); \
		$(call do_install,libbpf.h,$(prefix)/include/bpf,644); \
		$(call do_install,btf.h,$(prefix)/include/bpf,644); \
		$(call do_install,xsk.h,$(prefix)/include/bpf,644);

install: install_lib

### Cleaning rules

config-clean:
	$(call QUIET_CLEAN, config)
	$(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null

clean:
	$(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
		*.o *~ *.a *.so *.so.$(VERSION) .*.d .*.cmd LIBBPF-CFLAGS
	$(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf


PHONY += force elfdep bpfdep
force:

elfdep:
	@if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi

bpfdep:
	@if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi

# Declare the contents of the .PHONY variable as phony.  We keep that
# information in a variable so we can use it in if_changed and friends.
.PHONY: $(PHONY)
Commit	Line	Data
1bc38b8f	1	# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
1b76c13e WN	2	# Most of this file is copied from tools/lib/traceevent/Makefile
	3
	4	BPF_VERSION = 0
	5	BPF_PATCHLEVEL = 0
1d382264	6	BPF_EXTRAVERSION = 2
1b76c13e WN	7
	8	MAKEFLAGS += --no-print-directory
	9
d5ef3140	10	ifeq ($(srctree),)
e19b7cee	11	srctree := $(patsubst %/,%,$(dir $(CURDIR)))
d5ef3140 NR	12	srctree := $(patsubst %/,%,$(dir $(srctree)))
	13	srctree := $(patsubst %/,%,$(dir $(srctree)))
	14	#$(info Determined 'srctree' to be $(srctree))
	15	endif
1b76c13e	16
1b76c13e WN	17	INSTALL = install
	18
	19	# Use DESTDIR for installing into a different root directory.
	20	# This is useful for building a package. The program will be
	21	# installed in this directory as if it was the root directory.
	22	# Then the build tool can move it later.
	23	DESTDIR ?=
	24	DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
	25
d5ef3140 NR	26	include $(srctree)/tools/scripts/Makefile.arch
d5ef3140 NR	27
1b76c13e WN	28	ifeq ($(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
eeedd352	42	include $(srctree)/tools/scripts/Makefile.include
1b76c13e WN	43
	44	# copy a bit from Linux kbuild
	45
	46	ifeq ("$(origin V)", "command line")
	47	VERBOSE = $(V)
	48	endif
	49	ifndef VERBOSE
	50	VERBOSE = 0
	51	endif
	52
65f041be	53	FEATURE_USER = .libbpf
8c4905b9	54	FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx
20517cd9	55	FEATURE_DISPLAY = libelf bpf
1b76c13e	56
438363c0	57	INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
1b76c13e WN	58	FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
1b76c13e WN	59
d8ad6a15 WN	60	check_feat := 1
	61	NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
	62	ifdef MAKECMDGOALS
	63	ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
	64	check_feat := 0
	65	endif
	66	endif
	67
	68	ifeq ($(check_feat),1)
58683600	69	ifeq ($(FEATURES_DUMP),)
1b76c13e	70	include $(srctree)/tools/build/Makefile.feature
58683600 JO	71	else
	72	include $(FEATURES_DUMP)
	73	endif
d8ad6a15	74	endif
1b76c13e WN	75
	76	export prefix libdir src obj
	77
	78	# Shell quotes
	79	libdir_SQ = $(subst ','\'',$(libdir))
	80	libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
1b76c13e	81
1b76c13e WN	82	VERSION = $(BPF_VERSION)
	83	PATCHLEVEL = $(BPF_PATCHLEVEL)
	84	EXTRAVERSION = $(BPF_EXTRAVERSION)
	85
	86	OBJ = $@
	87	N =
	88
1d382264 DB	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*
1b76c13e WN	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
531b014e JK	105	ifeq ($(feature-reallocarray), 0)
	106	override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
	107	endif
	108
1b76c13e WN	109	# Append required CFLAGS
	110	override CFLAGS += $(EXTRA_WARNINGS)
	111	override CFLAGS += -Werror -Wall
	112	override CFLAGS += -fPIC
	113	override CFLAGS += $(INCLUDES)
ab9e0848	114	override CFLAGS += -fvisibility=hidden
1b76c13e WN	115
	116	ifeq ($(VERBOSE),1)
	117	Q =
	118	else
	119	Q = @
	120	endif
	121
505d3085	122	# Disable command line variables (CFLAGS) override from top
1b76c13e WN	123	# level Makefile (perf), otherwise build Makefile will get
	124	# the same command line setup.
	125	MAKEOVERRIDES=
	126
7c422f55 JO	127	all:
7c422f55 JO	128
1b76c13e	129	export srctree OUTPUT CC LD CFLAGS V
ab6201d0	130	include $(srctree)/tools/build/Makefile.include
1b76c13e	131
1d382264 DB	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))
1b76c13e	137
771744f9	138	GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN) \| \
306b267c	139	awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print s}')
771744f9	140	VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so \| \
306b267c AI	141	grep -Eo '[^ ]+@LIBBPF_' \| cut -d@ -f1 \| sort -u \| wc -l)
306b267c AI	142
1d382264	143	CMD_TARGETS = $(LIB_TARGET)
1b76c13e	144
8c4905b9 SF	145	CXX_TEST_TARGET = $(OUTPUT)test_libbpf
	146
	147	ifeq ($(feature-cxx), 1)
	148	CMD_TARGETS += $(CXX_TEST_TARGET)
	149	endif
	150
1b76c13e WN	151	TARGETS = $(CMD_TARGETS)
1b76c13e WN	152
8e268887 SF	153	all: fixdep
8e268887 SF	154	$(Q)$(MAKE) all_cmd
1b76c13e	155
306b267c	156	all_cmd: $(CMD_TARGETS) check
1b76c13e WN	157
1b76c13e WN	158	$(BPF_IN): force elfdep bpfdep
f15d5e6d	159	@(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
971e827b	160	(diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) \|\| \
8255e1ef	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
f15d5e6d	162	@(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
971e827b	163	(diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) \|\| \
8255e1ef	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
dc2b9f19 EL	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
1cad0788 MK	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
1b76c13e WN	174	$(Q)$(MAKE) $(build)=libbpf
1b76c13e WN	175
1d382264 DB	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.$(VERSION) \
89dedaef	180	-Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@
1d382264 DB	181	@ln -sf $(@F) $(OUTPUT)libbpf.so
1d382264 DB	182	@ln -sf $(@F) $(OUTPUT)libbpf.so.$(VERSION)
1b76c13e WN	183
	184	$(OUTPUT)libbpf.a: $(BPF_IN)
	185	$(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
	186
8c4905b9	187	$(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a
1cad0788	188	$(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@
8c4905b9	189
306b267c AI	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 $(VERSION_SCRIPT)." >&2; \
	199	exit 1; \
	200	fi
	201
1d382264 DB	202	define do_install_mkdir
	203	if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
	204	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
	205	fi
	206	endef
	207
1b76c13e WN	208	define do_install
	209	if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
	210	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
	211	fi; \
7110d80d	212	$(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
1b76c13e WN	213	endef
	214
	215	install_lib: all_cmd
1d382264 DB	216	$(call QUIET_INSTALL, $(LIB_TARGET)) \
	217	$(call do_install_mkdir,$(libdir_SQ)); \
	218	cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
1b76c13e	219
eb54e522 JK	220	install_headers:
eb54e522 JK	221	$(call QUIET_INSTALL, headers) \
7d386c62	222	$(call do_install,bpf.h,$(prefix)/include/bpf,644); \
8543e437 DB	223	$(call do_install,libbpf.h,$(prefix)/include/bpf,644); \
8543e437 DB	224	$(call do_install,btf.h,$(prefix)/include/bpf,644); \
379e2014	225	$(call do_install,xsk.h,$(prefix)/include/bpf,644);
eb54e522	226
1b76c13e WN	227	install: install_lib
	228
	229	### Cleaning rules
	230
	231	config-clean:
	232	$(call QUIET_CLEAN, config)
	233	$(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
	234
	235	clean:
8c4905b9	236	$(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
1d382264	237	.o ~ .a .so .so.$(VERSION) ..d .*.cmd LIBBPF-CFLAGS
0c77c04a	238	$(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
1b76c13e WN	239
	240
	241
	242	PHONY += force elfdep bpfdep
	243	force:
	244
	245	elfdep:
21567ede	246	@if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
1b76c13e WN	247
1b76c13e WN	248	bpfdep:
21567ede	249	@if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
1b76c13e WN	250
	251	# Declare the contents of the .PHONY variable as phony. We keep that
	252	# information in a variable so we can use it in if_changed and friends.
	253	.PHONY: $(PHONY)