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1# SPDX-License-Identifier: GPL-2.0
2# Most of this file is copied from tools/lib/traceevent/Makefile
3
4BPF_VERSION = 0
5BPF_PATCHLEVEL = 0
6BPF_EXTRAVERSION = 1
7
8MAKEFLAGS += --no-print-directory
9
10ifeq ($(srctree),)
11srctree := $(patsubst %/,%,$(dir $(CURDIR)))
12srctree := $(patsubst %/,%,$(dir $(srctree)))
13srctree := $(patsubst %/,%,$(dir $(srctree)))
14#$(info Determined 'srctree' to be $(srctree))
15endif
16
17# Makefiles suck: This macro sets a default value of $(2) for the
18# variable named by $(1), unless the variable has been set by
19# environment or command line. This is necessary for CC and AR
20# because make sets default values, so the simpler ?= approach
21# won't work as expected.
22define allow-override
23 $(if $(or $(findstring environment,$(origin $(1))),\
24 $(findstring command line,$(origin $(1)))),,\
25 $(eval $(1) = $(2)))
26endef
27
28# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
29$(call allow-override,CC,$(CROSS_COMPILE)gcc)
30$(call allow-override,AR,$(CROSS_COMPILE)ar)
31
32INSTALL = install
33
34# Use DESTDIR for installing into a different root directory.
35# This is useful for building a package. The program will be
36# installed in this directory as if it was the root directory.
37# Then the build tool can move it later.
38DESTDIR ?=
39DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
40
41include $(srctree)/tools/scripts/Makefile.arch
42
43ifeq ($(LP64), 1)
44 libdir_relative = lib64
45else
46 libdir_relative = lib
47endif
48
49prefix ?= /usr/local
50libdir = $(prefix)/$(libdir_relative)
51man_dir = $(prefix)/share/man
52man_dir_SQ = '$(subst ','\'',$(man_dir))'
53
54export man_dir man_dir_SQ INSTALL
55export DESTDIR DESTDIR_SQ
56
57include ../../scripts/Makefile.include
58
59# copy a bit from Linux kbuild
60
61ifeq ("$(origin V)", "command line")
62 VERBOSE = $(V)
63endif
64ifndef VERBOSE
65 VERBOSE = 0
66endif
67
68FEATURE_USER = .libbpf
69FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf
70FEATURE_DISPLAY = libelf bpf
71
72INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
73FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
74
75check_feat := 1
76NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
77ifdef MAKECMDGOALS
78ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
79 check_feat := 0
80endif
81endif
82
83ifeq ($(check_feat),1)
84ifeq ($(FEATURES_DUMP),)
85include $(srctree)/tools/build/Makefile.feature
86else
87include $(FEATURES_DUMP)
88endif
89endif
90
91export prefix libdir src obj
92
93# Shell quotes
94libdir_SQ = $(subst ','\'',$(libdir))
95libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
96
97LIB_FILE = libbpf.a libbpf.so
98
99VERSION = $(BPF_VERSION)
100PATCHLEVEL = $(BPF_PATCHLEVEL)
101EXTRAVERSION = $(BPF_EXTRAVERSION)
102
103OBJ = $@
104N =
105
106LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
107
108# Set compile option CFLAGS
109ifdef EXTRA_CFLAGS
110 CFLAGS := $(EXTRA_CFLAGS)
111else
112 CFLAGS := -g -Wall
113endif
114
115ifeq ($(feature-libelf-mmap), 1)
116 override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
117endif
118
119ifeq ($(feature-libelf-getphdrnum), 1)
120 override CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT
121endif
122
123# Append required CFLAGS
124override CFLAGS += $(EXTRA_WARNINGS)
125override CFLAGS += -Werror -Wall
126override CFLAGS += -fPIC
127override CFLAGS += $(INCLUDES)
128
129ifeq ($(VERBOSE),1)
130 Q =
131else
132 Q = @
133endif
134
135# Disable command line variables (CFLAGS) override from top
136# level Makefile (perf), otherwise build Makefile will get
137# the same command line setup.
138MAKEOVERRIDES=
139
140all:
141
142export srctree OUTPUT CC LD CFLAGS V
143include $(srctree)/tools/build/Makefile.include
144
145BPF_IN := $(OUTPUT)libbpf-in.o
146LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
147
148CMD_TARGETS = $(LIB_FILE)
149
150TARGETS = $(CMD_TARGETS)
151
152all: fixdep all_cmd
153
154all_cmd: $(CMD_TARGETS)
155
156$(BPF_IN): force elfdep bpfdep
157 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
158 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
159 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
160 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
161 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
162 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
163 @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
164 (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
165 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
166 @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
167 (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
168 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
169 $(Q)$(MAKE) $(build)=libbpf
170
171$(OUTPUT)libbpf.so: $(BPF_IN)
172 $(QUIET_LINK)$(CC) --shared $^ -o $@
173
174$(OUTPUT)libbpf.a: $(BPF_IN)
175 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
176
177define do_install
178 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
179 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
180 fi; \
181 $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
182endef
183
184install_lib: all_cmd
185 $(call QUIET_INSTALL, $(LIB_FILE)) \
186 $(call do_install,$(LIB_FILE),$(libdir_SQ))
187
188install_headers:
189 $(call QUIET_INSTALL, headers) \
190 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \
191 $(call do_install,libbpf.h,$(prefix)/include/bpf,644);
192
193install: install_lib
194
195### Cleaning rules
196
197config-clean:
198 $(call QUIET_CLEAN, config)
199 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
200
201clean:
202 $(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so .*.d .*.cmd \
203 $(RM) LIBBPF-CFLAGS
204 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
205
206
207
208PHONY += force elfdep bpfdep
209force:
210
211elfdep:
212 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
213
214bpfdep:
215 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
216
217# Declare the contents of the .PHONY variable as phony. We keep that
218# information in a variable so we can use it in if_changed and friends.
219.PHONY: $(PHONY)
1# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2# Most of this file is copied from tools/lib/traceevent/Makefile
3
4RM ?= rm
5srctree := $(realpath $(srctree))
6
7VERSION_SCRIPT := libbpf.map
8LIBBPF_VERSION := $(shell \
9 grep -oE '^LIBBPF_([0-9.]+)' $(VERSION_SCRIPT) | \
10 sort -rV | head -n1 | cut -d'_' -f2)
11LIBBPF_MAJOR_VERSION := $(word 1,$(subst ., ,$(LIBBPF_VERSION)))
12LIBBPF_MINOR_VERSION := $(word 2,$(subst ., ,$(LIBBPF_VERSION)))
13
14MAKEFLAGS += --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
20ifndef building_out_of_srctree
21srctree := $(patsubst %/,%,$(dir $(CURDIR)))
22srctree := $(patsubst %/,%,$(dir $(srctree)))
23srctree := $(patsubst %/,%,$(dir $(srctree)))
24#$(info Determined 'srctree' to be $(srctree))
25endif
26
27INSTALL = install
28
29# Use DESTDIR for installing into a different root directory.
30# This is useful for building a package. The program will be
31# installed in this directory as if it was the root directory.
32# Then the build tool can move it later.
33DESTDIR ?=
34DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
35
36include $(srctree)/tools/scripts/Makefile.arch
37
38ifeq ($(LP64), 1)
39 libdir_relative = lib64
40else
41 libdir_relative = lib
42endif
43
44prefix ?= /usr/local
45libdir = $(prefix)/$(libdir_relative)
46man_dir = $(prefix)/share/man
47man_dir_SQ = '$(subst ','\'',$(man_dir))'
48
49export man_dir man_dir_SQ INSTALL
50export DESTDIR DESTDIR_SQ
51
52include $(srctree)/tools/scripts/Makefile.include
53
54# copy a bit from Linux kbuild
55
56ifeq ("$(origin V)", "command line")
57 VERBOSE = $(V)
58endif
59ifndef VERBOSE
60 VERBOSE = 0
61endif
62
63INCLUDES = -I$(or $(OUTPUT),.) \
64 -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi \
65 -I$(srctree)/tools/arch/$(SRCARCH)/include
66
67export prefix libdir src obj
68
69# Shell quotes
70libdir_SQ = $(subst ','\'',$(libdir))
71libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
72
73OBJ = $@
74N =
75
76LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)
77LIB_FILE = libbpf.a libbpf.so*
78PC_FILE = libbpf.pc
79
80# Set compile option CFLAGS
81ifdef EXTRA_CFLAGS
82 CFLAGS := $(EXTRA_CFLAGS)
83else
84 CFLAGS := -g -O2
85endif
86
87# Append required CFLAGS
88override CFLAGS += -std=gnu89
89override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
90override CFLAGS += -Werror -Wall
91override CFLAGS += $(INCLUDES)
92override CFLAGS += -fvisibility=hidden
93override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
94override CFLAGS += $(CLANG_CROSS_FLAGS)
95
96# flags specific for shared library
97SHLIB_FLAGS := -DSHARED -fPIC
98
99ifeq ($(VERBOSE),1)
100 Q =
101else
102 Q = @
103endif
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.
108MAKEOVERRIDES=
109
110all:
111
112OUTPUT ?= ./
113OUTPUT := $(abspath $(OUTPUT))/
114export srctree OUTPUT CC LD CFLAGS V
115include $(srctree)/tools/build/Makefile.include
116
117SHARED_OBJDIR := $(OUTPUT)sharedobjs/
118STATIC_OBJDIR := $(OUTPUT)staticobjs/
119BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o
120BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o
121BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
122BPF_GENERATED := $(BPF_HELPER_DEFS)
123
124LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
125LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
126PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))
127
128TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
129
130GLOBAL_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)
135VERSIONED_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
140CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
141
142all: fixdep
143 $(Q)$(MAKE) all_cmd
144
145all_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
189check: check_abi check_version
190
191check_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 $$NF}'| \
206 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
207 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
208 diff -u $(OUTPUT)libbpf_global_syms.tmp \
209 $(OUTPUT)libbpf_versioned_syms.tmp; \
210 rm $(OUTPUT)libbpf_global_syms.tmp \
211 $(OUTPUT)libbpf_versioned_syms.tmp; \
212 exit 1; \
213 fi
214
215HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
216HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
217
218check_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)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \
227 exit 1; \
228 fi
229
230define do_install_mkdir
231 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
232 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
233 fi
234endef
235
236define do_install
237 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
238 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
239 fi; \
240 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
241endef
242
243install_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
248SRC_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
251GEN_HDRS := $(BPF_GENERATED)
252
253INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf
254INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS))
255INSTALL_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
265install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS)
266 $(call QUIET_INSTALL, libbpf_headers)
267
268install_pkgconfig: $(PC_FILE)
269 $(call QUIET_INSTALL, $(PC_FILE)) \
270 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
271
272install: install_lib install_pkgconfig install_headers
273
274clean: 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
281PHONY += force cscope tags check check_abi check_version
282force:
283
284cscope:
285 ls *.c *.h > cscope.files
286 cscope -b -q -I $(srctree)/include -f cscope.out
287
288tags:
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
299help:
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'