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