1 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2- 1 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2 # Most of this file is copied from tools/lib/t 2 # Most of this file is copied from tools/lib/traceevent/Makefile
3 3
4 RM ?= rm !! 4 BPF_VERSION = 0
5 srctree := $(realpath $(srctree)) !! 5 BPF_PATCHLEVEL = 0
6 !! 6 BPF_EXTRAVERSION = 2
7 VERSION_SCRIPT := libbpf.map <<
8 LIBBPF_VERSION := $(shell \ <<
9 grep -oE '^LIBBPF_([0-9.]+)' $(VERSION <<
10 sort -rV | head -n1 | cut -d'_' -f2) <<
11 LIBBPF_MAJOR_VERSION := $(word 1,$(subst ., ,$ <<
12 LIBBPF_MINOR_VERSION := $(word 2,$(subst ., ,$ <<
13 7
14 MAKEFLAGS += --no-print-directory 8 MAKEFLAGS += --no-print-directory
15 9
16 # This will work when bpf is built in tools en !! 10 ifeq ($(srctree),)
17 # isn't set and when invoked from selftests bu <<
18 # is a ".". building_out_of_srctree is undefin <<
19 # builds <<
20 ifndef building_out_of_srctree <<
21 srctree := $(patsubst %/,%,$(dir $(CURDIR))) 11 srctree := $(patsubst %/,%,$(dir $(CURDIR)))
22 srctree := $(patsubst %/,%,$(dir $(srctree))) 12 srctree := $(patsubst %/,%,$(dir $(srctree)))
23 srctree := $(patsubst %/,%,$(dir $(srctree))) 13 srctree := $(patsubst %/,%,$(dir $(srctree)))
24 #$(info Determined 'srctree' to be $(srctree)) 14 #$(info Determined 'srctree' to be $(srctree))
25 endif 15 endif
26 16
27 INSTALL = install 17 INSTALL = install
28 18
29 # Use DESTDIR for installing into a different 19 # Use DESTDIR for installing into a different root directory.
30 # This is useful for building a package. The p 20 # This is useful for building a package. The program will be
31 # installed in this directory as if it was the 21 # installed in this directory as if it was the root directory.
32 # Then the build tool can move it later. 22 # Then the build tool can move it later.
33 DESTDIR ?= 23 DESTDIR ?=
34 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))' 24 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
35 25
36 include $(srctree)/tools/scripts/Makefile.arch 26 include $(srctree)/tools/scripts/Makefile.arch
37 27
38 ifeq ($(LP64), 1) 28 ifeq ($(LP64), 1)
39 libdir_relative = lib64 29 libdir_relative = lib64
40 else 30 else
41 libdir_relative = lib 31 libdir_relative = lib
42 endif 32 endif
43 33
44 prefix ?= /usr/local 34 prefix ?= /usr/local
45 libdir = $(prefix)/$(libdir_relative) 35 libdir = $(prefix)/$(libdir_relative)
46 man_dir = $(prefix)/share/man 36 man_dir = $(prefix)/share/man
47 man_dir_SQ = '$(subst ','\'',$(man_dir))' 37 man_dir_SQ = '$(subst ','\'',$(man_dir))'
48 38
49 export man_dir man_dir_SQ INSTALL 39 export man_dir man_dir_SQ INSTALL
50 export DESTDIR DESTDIR_SQ 40 export DESTDIR DESTDIR_SQ
51 41
52 include $(srctree)/tools/scripts/Makefile.incl 42 include $(srctree)/tools/scripts/Makefile.include
53 43
54 # copy a bit from Linux kbuild 44 # copy a bit from Linux kbuild
55 45
56 ifeq ("$(origin V)", "command line") 46 ifeq ("$(origin V)", "command line")
57 VERBOSE = $(V) 47 VERBOSE = $(V)
58 endif 48 endif
59 ifndef VERBOSE 49 ifndef VERBOSE
60 VERBOSE = 0 50 VERBOSE = 0
61 endif 51 endif
62 52
63 INCLUDES = -I$(or $(OUTPUT),.) \ !! 53 FEATURE_USER = .libbpf
64 -I$(srctree)/tools/include -I$(srct !! 54 FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx
>> 55 FEATURE_DISPLAY = libelf bpf
>> 56
>> 57 INCLUDES = -I. -I$(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
65 75
66 export prefix libdir src obj 76 export prefix libdir src obj
67 77
68 # Shell quotes 78 # Shell quotes
69 libdir_SQ = $(subst ','\'',$(libdir)) 79 libdir_SQ = $(subst ','\'',$(libdir))
70 libdir_relative_SQ = $(subst ','\'',$(libdir_r 80 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
71 81
>> 82 VERSION = $(BPF_VERSION)
>> 83 PATCHLEVEL = $(BPF_PATCHLEVEL)
>> 84 EXTRAVERSION = $(BPF_EXTRAVERSION)
>> 85
72 OBJ = $@ 86 OBJ = $@
73 N = 87 N =
74 88
>> 89 LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
>> 90
75 LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_ 91 LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)
76 LIB_FILE = libbpf.a libbpf.so* 92 LIB_FILE = libbpf.a libbpf.so*
77 PC_FILE = libbpf.pc <<
78 93
79 # Set compile option CFLAGS 94 # Set compile option CFLAGS
80 ifdef EXTRA_CFLAGS 95 ifdef EXTRA_CFLAGS
81 CFLAGS := $(EXTRA_CFLAGS) 96 CFLAGS := $(EXTRA_CFLAGS)
82 else 97 else
83 CFLAGS := -g -O2 !! 98 CFLAGS := -g -Wall
>> 99 endif
>> 100
>> 101 ifeq ($(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
84 endif 107 endif
85 108
86 # Append required CFLAGS 109 # Append required CFLAGS
87 override CFLAGS += -std=gnu89 !! 110 override CFLAGS += $(EXTRA_WARNINGS)
88 override CFLAGS += $(EXTRA_WARNINGS) -Wno-swit <<
89 override CFLAGS += -Werror -Wall 111 override CFLAGS += -Werror -Wall
>> 112 override CFLAGS += -fPIC
90 override CFLAGS += $(INCLUDES) 113 override CFLAGS += $(INCLUDES)
91 override CFLAGS += -fvisibility=hidden 114 override CFLAGS += -fvisibility=hidden
92 override CFLAGS += -D_LARGEFILE64_SOURCE -D_FI <<
93 override CFLAGS += $(CLANG_CROSS_FLAGS) <<
94 <<
95 # flags specific for shared library <<
96 SHLIB_FLAGS := -DSHARED -fPIC <<
97 115
98 ifeq ($(VERBOSE),1) 116 ifeq ($(VERBOSE),1)
99 Q = 117 Q =
100 else 118 else
101 Q = @ 119 Q = @
102 endif 120 endif
103 121
104 # Disable command line variables (CFLAGS) over 122 # Disable command line variables (CFLAGS) override from top
105 # level Makefile (perf), otherwise build Makef 123 # level Makefile (perf), otherwise build Makefile will get
106 # the same command line setup. 124 # the same command line setup.
107 MAKEOVERRIDES= 125 MAKEOVERRIDES=
108 126
109 all: 127 all:
110 128
111 OUTPUT ?= ./ <<
112 OUTPUT := $(abspath $(OUTPUT))/ <<
113 export srctree OUTPUT CC LD CFLAGS V 129 export srctree OUTPUT CC LD CFLAGS V
114 include $(srctree)/tools/build/Makefile.includ 130 include $(srctree)/tools/build/Makefile.include
115 131
116 SHARED_OBJDIR := $(OUTPUT)sharedobjs/ !! 132 BPF_IN := $(OUTPUT)libbpf-in.o
117 STATIC_OBJDIR := $(OUTPUT)staticobjs/ !! 133 VERSION_SCRIPT := libbpf.map
118 BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o <<
119 BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o <<
120 BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h <<
121 BPF_GENERATED := $(BPF_HELPER_DEFS) <<
122 134
123 LIB_TARGET := $(addprefix $(OUTPUT),$(LIB 135 LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
124 LIB_FILE := $(addprefix $(OUTPUT),$(LIB 136 LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
125 PC_FILE := $(addprefix $(OUTPUT),$(PC_ <<
126 137
127 TAGS_PROG := $(if $(shell which etags 2>/dev/n !! 138 GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN) | \
128 !! 139 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print s}')
129 GLOBAL_SYM_COUNT = $(shell readelf -s --wide $ !! 140 VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so | \
130 cut -d "@" -f1 | se <<
131 sed 's/\[.*\]//' | <<
132 awk '/GLOBAL/ && /D <<
133 sort -u | wc -l) <<
134 VERSIONED_SYM_COUNT = $(shell readelf --dyn-sy <<
135 sed 's/\[.*\]//' <<
136 awk '/GLOBAL/ && <<
137 grep -Eo '[^ ]+@ 141 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
138 142
139 CMD_TARGETS = $(LIB_TARGET) $(PC_FILE) !! 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)
140 152
141 all: fixdep 153 all: fixdep
142 $(Q)$(MAKE) all_cmd 154 $(Q)$(MAKE) all_cmd
143 155
144 all_cmd: $(CMD_TARGETS) check 156 all_cmd: $(CMD_TARGETS) check
145 157
146 $(SHARED_OBJDIR) $(STATIC_OBJDIR): !! 158 $(BPF_IN): force elfdep bpfdep
147 $(Q)mkdir -p $@ <<
148 <<
149 $(BPF_IN_SHARED): force $(BPF_GENERATED) | $(S <<
150 @(test -f ../../include/uapi/linux/bpf 159 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
151 (diff -B ../../include/uapi/linux/bpf. 160 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
152 echo "Warning: Kernel ABI header at 't 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
153 @(test -f ../../include/uapi/linux/bpf 162 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
154 (diff -B ../../include/uapi/linux/bpf_ 163 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
155 echo "Warning: Kernel ABI header at 't 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
156 @(test -f ../../include/uapi/linux/if_ 171 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
157 (diff -B ../../include/uapi/linux/if_x 172 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
158 echo "Warning: Kernel ABI header at 't 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
159 $(SILENT_MAKE) -C $(srctree)/tools/bui !! 174 $(Q)$(MAKE) $(build)=libbpf
160 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(S <<
161 <<
162 $(BPF_IN_STATIC): force $(BPF_GENERATED) | $(S <<
163 $(SILENT_MAKE) -C $(srctree)/tools/bui <<
164 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(S <<
165 <<
166 $(BPF_HELPER_DEFS): $(srctree)/tools/include/u <<
167 $(QUIET_GEN)$(srctree)/scripts/bpf_doc <<
168 --file $(srctree)/tools/includ <<
169 175
170 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBP 176 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
171 177
172 $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN !! 178 $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN)
173 $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS !! 179 $(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(VERSION) \
174 --shared -Wl,-soname,libbpf.so !! 180 -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@
175 -Wl,--version-script=$(VERSION <<
176 @ln -sf $(@F) $(OUTPUT)libbpf.so 181 @ln -sf $(@F) $(OUTPUT)libbpf.so
177 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIB !! 182 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(VERSION)
178 183
179 $(OUTPUT)libbpf.a: $(BPF_IN_STATIC) !! 184 $(OUTPUT)libbpf.a: $(BPF_IN)
180 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ !! 185 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
181 186
182 $(OUTPUT)libbpf.pc: !! 187 $(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a
183 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefi !! 188 $(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@
184 -e "s|@LIBDIR@|$(libdir_SQ)|" <<
185 -e "s|@VERSION@|$(LIBBPF_VERSI <<
186 < libbpf.pc.template > $@ <<
187 189
188 check: check_abi check_version !! 190 check: check_abi
189 191
190 check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT !! 192 check_abi: $(OUTPUT)libbpf.so
191 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERS 193 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
192 echo "Warning: Num of global s !! 194 echo "Warning: Num of global symbols in $(BPF_IN)" \
193 "($(GLOBAL_SYM_COUNT)) do 195 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \
194 "versioned symbols in $^ 196 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
195 "Please make sure all LIB 197 "Please make sure all LIBBPF_API symbols are" \
196 "versioned in $(VERSION_S 198 "versioned in $(VERSION_SCRIPT)." >&2; \
197 readelf -s --wide $(BPF_IN_SHA <<
198 cut -d "@" -f1 | sed 's/_v <<
199 sed 's/\[.*\]//' | <<
200 awk '/GLOBAL/ && /DEFAULT/ <<
201 sort -u > $(OUTPUT)libbpf_ <<
202 readelf --dyn-syms --wide $(OU <<
203 sed 's/\[.*\]//' | <<
204 awk '/GLOBAL/ && /DEFAULT/ <<
205 grep -Eo '[^ ]+@LIBBPF_' | <<
206 sort -u > $(OUTPUT)libbpf_ <<
207 diff -u $(OUTPUT)libbpf_global <<
208 $(OUTPUT)libbpf_versioned <<
209 rm $(OUTPUT)libbpf_global_syms <<
210 $(OUTPUT)libbpf_versioned_s <<
211 exit 1; 199 exit 1; \
212 fi 200 fi
213 201
214 HDR_MAJ_VERSION := $(shell grep -oE '^$(pound) <<
215 HDR_MIN_VERSION := $(shell grep -oE '^$(pound) <<
216 <<
217 check_version: $(VERSION_SCRIPT) libbpf_versio <<
218 @if [ "$(HDR_MAJ_VERSION)" != "$(LIBBP <<
219 echo "Error: libbpf major vers <<
220 "'$(HDR_MAJ_VERSION)' != <<
221 exit 1; <<
222 fi <<
223 @if [ "$(HDR_MIN_VERSION)" != "$(LIBBP <<
224 echo "Error: libbpf minor vers <<
225 "'$(HDR_MIN_VERSION)' != <<
226 exit 1; <<
227 fi <<
228 <<
229 define do_install_mkdir 202 define do_install_mkdir
230 if [ ! -d '$(DESTDIR_SQ)$1' ]; then 203 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
231 $(INSTALL) -d -m 755 '$(DESTDI 204 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
232 fi 205 fi
233 endef 206 endef
234 207
235 define do_install 208 define do_install
236 if [ ! -d '$(DESTDIR_SQ)$2' ]; then 209 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
237 $(INSTALL) -d -m 755 '$(DESTDI 210 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
238 fi; 211 fi; \
239 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTD !! 212 $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
240 endef 213 endef
241 214
242 install_lib: all_cmd 215 install_lib: all_cmd
243 $(call QUIET_INSTALL, $(LIB_TARGET)) \ 216 $(call QUIET_INSTALL, $(LIB_TARGET)) \
244 $(call do_install_mkdir,$(libd 217 $(call do_install_mkdir,$(libdir_SQ)); \
245 cp -fpR $(LIB_FILE) $(DESTDIR) 218 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
246 219
247 SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common !! 220 install_headers:
248 bpf_helpers.h bpf_tracing.h bpf_en !! 221 $(call QUIET_INSTALL, headers) \
249 skel_internal.h libbpf_version.h u !! 222 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \
250 GEN_HDRS := $(BPF_GENERATED) !! 223 $(call do_install,libbpf.h,$(prefix)/include/bpf,644); \
251 !! 224 $(call do_install,btf.h,$(prefix)/include/bpf,644); \
252 INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf !! 225 $(call do_install,xsk.h,$(prefix)/include/bpf,644);
253 INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX) <<
254 INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX) <<
255 <<
256 $(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h <<
257 $(call QUIET_INSTALL, $@) \ <<
258 $(call do_install,$<,$(prefix) <<
259 <<
260 $(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUT <<
261 $(call QUIET_INSTALL, $@) \ <<
262 $(call do_install,$<,$(prefix) <<
263 <<
264 install_headers: $(BPF_GENERATED) $(INSTALL_SR <<
265 $(call QUIET_INSTALL, libbpf_headers) <<
266 <<
267 install_pkgconfig: $(PC_FILE) <<
268 $(call QUIET_INSTALL, $(PC_FILE)) \ <<
269 $(call do_install,$(PC_FILE),$ <<
270 <<
271 install: install_lib install_pkgconfig install <<
272 <<
273 clean: fixdep-clean <<
274 $(call QUIET_CLEAN, libbpf) $(RM) -rf <<
275 *~ .*.d .*.cmd LIBBPF-CFLAGS $ <<
276 $(SHARED_OBJDIR) $(STATIC_OBJD <<
277 $(addprefix $(OUTPUT), <<
278 *.o *.a *.so *.so. <<
279 226
280 PHONY += force cscope tags check check_abi che !! 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:
>> 236 $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
>> 237 *.o *~ *.a *.so *.so.$(VERSION) .*.d .*.cmd LIBBPF-CFLAGS
>> 238 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
>> 239
>> 240
>> 241
>> 242 PHONY += force elfdep bpfdep
281 force: 243 force:
282 244
283 cscope: !! 245 elfdep:
284 ls *.c *.h > cscope.files !! 246 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
285 cscope -b -q -I $(srctree)/include -f !! 247
286 !! 248 bpfdep:
287 tags: !! 249 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
288 $(RM) -f TAGS tags <<
289 ls *.c *.h | xargs $(TAGS_PROG) -a <<
290 250
291 # Declare the contents of the .PHONY variable 251 # Declare the contents of the .PHONY variable as phony. We keep that
292 # information in a variable so we can use it i 252 # information in a variable so we can use it in if_changed and friends.
293 .PHONY: $(PHONY) 253 .PHONY: $(PHONY)
294 <<
295 # Delete partially updated (corrupted) files o <<
296 .DELETE_ON_ERROR: <<
297 <<
298 help: <<
299 @echo 'libbpf common targets:' <<
300 @echo ' HINT: use "V=1" to enable ver <<
301 @echo ' all - build libraries and <<
302 @echo ' clean - remove all generate <<
303 @echo ' check - check ABI and versi <<
304 @echo '' <<
305 @echo 'libbpf install targets:' <<
306 @echo ' HINT: use "prefix"(defaults t <<
307 @echo ' to adjust target destin <<
308 @echo ' install - build and <<
309 @echo ' install_headers - install on <<
310 @echo '' <<
311 @echo 'libbpf make targets:' <<
312 @echo ' tags - use ctags to make t <<
313 @echo ' cscope - use cscope to make <<
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