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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: $(PHONY)
310
311# Delete partially updated (corrupted) files on error
312.DELETE_ON_ERROR:
1# Most of this file is copied from tools/lib/traceevent/Makefile
2
3BPF_VERSION = 0
4BPF_PATCHLEVEL = 0
5BPF_EXTRAVERSION = 1
6
7MAKEFLAGS += --no-print-directory
8
9ifeq ($(srctree),)
10srctree := $(patsubst %/,%,$(dir $(shell pwd)))
11srctree := $(patsubst %/,%,$(dir $(srctree)))
12srctree := $(patsubst %/,%,$(dir $(srctree)))
13#$(info Determined 'srctree' to be $(srctree))
14endif
15
16# Makefiles suck: This macro sets a default value of $(2) for the
17# variable named by $(1), unless the variable has been set by
18# environment or command line. This is necessary for CC and AR
19# because make sets default values, so the simpler ?= approach
20# won't work as expected.
21define allow-override
22 $(if $(or $(findstring environment,$(origin $(1))),\
23 $(findstring command line,$(origin $(1)))),,\
24 $(eval $(1) = $(2)))
25endef
26
27# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
28$(call allow-override,CC,$(CROSS_COMPILE)gcc)
29$(call allow-override,AR,$(CROSS_COMPILE)ar)
30
31INSTALL = install
32
33# Use DESTDIR for installing into a different root directory.
34# This is useful for building a package. The program will be
35# installed in this directory as if it was the root directory.
36# Then the build tool can move it later.
37DESTDIR ?=
38DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
39
40include $(srctree)/tools/scripts/Makefile.arch
41
42ifeq ($(LP64), 1)
43 libdir_relative = lib64
44else
45 libdir_relative = lib
46endif
47
48prefix ?= /usr/local
49libdir = $(prefix)/$(libdir_relative)
50man_dir = $(prefix)/share/man
51man_dir_SQ = '$(subst ','\'',$(man_dir))'
52
53export man_dir man_dir_SQ INSTALL
54export DESTDIR DESTDIR_SQ
55
56include ../../scripts/Makefile.include
57
58# copy a bit from Linux kbuild
59
60ifeq ("$(origin V)", "command line")
61 VERBOSE = $(V)
62endif
63ifndef VERBOSE
64 VERBOSE = 0
65endif
66
67FEATURE_USER = .libbpf
68FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf
69FEATURE_DISPLAY = libelf bpf
70
71INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/arch/$(ARCH)/include/uapi -I$(srctree)/include/uapi
72FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
73
74check_feat := 1
75NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
76ifdef MAKECMDGOALS
77ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
78 check_feat := 0
79endif
80endif
81
82ifeq ($(check_feat),1)
83ifeq ($(FEATURES_DUMP),)
84include $(srctree)/tools/build/Makefile.feature
85else
86include $(FEATURES_DUMP)
87endif
88endif
89
90export prefix libdir src obj
91
92# Shell quotes
93libdir_SQ = $(subst ','\'',$(libdir))
94libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
95plugin_dir_SQ = $(subst ','\'',$(plugin_dir))
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) overide 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 $(VERSION_FILES) all_cmd
153
154all_cmd: $(CMD_TARGETS)
155
156$(BPF_IN): force elfdep bpfdep
157 $(Q)$(MAKE) $(build)=libbpf
158
159$(OUTPUT)libbpf.so: $(BPF_IN)
160 $(QUIET_LINK)$(CC) --shared $^ -o $@
161
162$(OUTPUT)libbpf.a: $(BPF_IN)
163 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
164
165define update_dir
166 (echo $1 > $@.tmp; \
167 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
168 rm -f $@.tmp; \
169 else \
170 echo ' UPDATE $@'; \
171 mv -f $@.tmp $@; \
172 fi);
173endef
174
175define do_install
176 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
177 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
178 fi; \
179 $(INSTALL) $1 '$(DESTDIR_SQ)$2'
180endef
181
182install_lib: all_cmd
183 $(call QUIET_INSTALL, $(LIB_FILE)) \
184 $(call do_install,$(LIB_FILE),$(libdir_SQ))
185
186install: install_lib
187
188### Cleaning rules
189
190config-clean:
191 $(call QUIET_CLEAN, config)
192 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
193
194clean:
195 $(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d .*.cmd \
196 $(RM) LIBBPF-CFLAGS
197 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
198
199
200
201PHONY += force elfdep bpfdep
202force:
203
204elfdep:
205 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit -1 ; fi
206
207bpfdep:
208 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit -1 ; fi
209
210# Declare the contents of the .PHONY variable as phony. We keep that
211# information in a variable so we can use it in if_changed and friends.
212.PHONY: $(PHONY)