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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
4RM ?= rm
5srctree = $(abs_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
66export prefix libdir src obj
67
68# Shell quotes
69libdir_SQ = $(subst ','\'',$(libdir))
70libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
71
72OBJ = $@
73N =
74
75LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)
76LIB_FILE = libbpf.a libbpf.so*
77PC_FILE = libbpf.pc
78
79# Set compile option CFLAGS
80ifdef EXTRA_CFLAGS
81 CFLAGS := $(EXTRA_CFLAGS)
82else
83 CFLAGS := -g -O2
84endif
85
86# Append required CFLAGS
87override CFLAGS += -std=gnu89
88override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
89override CFLAGS += -Werror -Wall
90override CFLAGS += $(INCLUDES)
91override CFLAGS += -fvisibility=hidden
92override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
93override CFLAGS += $(CLANG_CROSS_FLAGS)
94
95# flags specific for shared library
96SHLIB_FLAGS := -DSHARED -fPIC
97
98ifeq ($(VERBOSE),1)
99 Q =
100else
101 Q = @
102endif
103
104# Disable command line variables (CFLAGS) override from top
105# level Makefile (perf), otherwise build Makefile will get
106# the same command line setup.
107MAKEOVERRIDES=
108
109all:
110
111export srctree OUTPUT CC LD CFLAGS V
112include $(srctree)/tools/build/Makefile.include
113
114SHARED_OBJDIR := $(OUTPUT)sharedobjs/
115STATIC_OBJDIR := $(OUTPUT)staticobjs/
116BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o
117BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o
118BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
119BPF_GENERATED := $(BPF_HELPER_DEFS)
120
121LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
122LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
123PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))
124
125TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
126
127GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \
128 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
129 sed 's/\[.*\]//' | \
130 awk '/GLOBAL/ && /DEFAULT && !/UND|ABS/ {print $$NF}' | \
131 sort -u | wc -l)
132VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
133 sed 's/\[.*\]//' | \
134 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
135 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
136
137CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
138
139all: fixdep
140 $(Q)$(MAKE) all_cmd
141
142all_cmd: $(CMD_TARGETS) check
143
144$(BPF_IN_SHARED): force $(BPF_GENERATED)
145 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
146 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
147 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
148 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
149 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
150 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
151 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
152 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
153 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
154 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
155
156$(BPF_IN_STATIC): force $(BPF_GENERATED)
157 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
158
159$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
160 $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \
161 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
162
163$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
164
165$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)
166 $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \
167 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
168 -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@
169 @ln -sf $(@F) $(OUTPUT)libbpf.so
170 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
171
172$(OUTPUT)libbpf.a: $(BPF_IN_STATIC)
173 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^
174
175$(OUTPUT)libbpf.pc:
176 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
177 -e "s|@LIBDIR@|$(libdir_SQ)|" \
178 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \
179 < libbpf.pc.template > $@
180
181check: check_abi check_version
182
183check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)
184 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
185 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \
186 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \
187 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
188 "Please make sure all LIBBPF_API symbols are" \
189 "versioned in $(VERSION_SCRIPT)." >&2; \
190 readelf -s --wide $(BPF_IN_SHARED) | \
191 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
192 sed 's/\[.*\]//' | \
193 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
194 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
195 readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
196 sed 's/\[.*\]//' | \
197 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'| \
198 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
199 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
200 diff -u $(OUTPUT)libbpf_global_syms.tmp \
201 $(OUTPUT)libbpf_versioned_syms.tmp; \
202 rm $(OUTPUT)libbpf_global_syms.tmp \
203 $(OUTPUT)libbpf_versioned_syms.tmp; \
204 exit 1; \
205 fi
206
207HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
208HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
209
210check_version: $(VERSION_SCRIPT) libbpf_version.h
211 @if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then \
212 echo "Error: libbpf major version mismatch detected: " \
213 "'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2; \
214 exit 1; \
215 fi
216 @if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then \
217 echo "Error: libbpf minor version mismatch detected: " \
218 "'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \
219 exit 1; \
220 fi
221
222define do_install_mkdir
223 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
224 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
225 fi
226endef
227
228define do_install
229 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
230 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
231 fi; \
232 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
233endef
234
235install_lib: all_cmd
236 $(call QUIET_INSTALL, $(LIB_TARGET)) \
237 $(call do_install_mkdir,$(libdir_SQ)); \
238 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
239
240SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h \
241 bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h \
242 skel_internal.h libbpf_version.h usdt.bpf.h
243GEN_HDRS := $(BPF_GENERATED)
244
245INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf
246INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS))
247INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS)))
248
249$(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h
250 $(call QUIET_INSTALL, $@) \
251 $(call do_install,$<,$(prefix)/include/bpf,644)
252
253$(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h
254 $(call QUIET_INSTALL, $@) \
255 $(call do_install,$<,$(prefix)/include/bpf,644)
256
257install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS)
258 $(call QUIET_INSTALL, libbpf_headers)
259
260install_pkgconfig: $(PC_FILE)
261 $(call QUIET_INSTALL, $(PC_FILE)) \
262 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
263
264install: install_lib install_pkgconfig install_headers
265
266clean:
267 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \
268 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED) \
269 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \
270 $(addprefix $(OUTPUT), \
271 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
272
273PHONY += force cscope tags check check_abi check_version
274force:
275
276cscope:
277 ls *.c *.h > cscope.files
278 cscope -b -q -I $(srctree)/include -f cscope.out
279
280tags:
281 $(RM) -f TAGS tags
282 ls *.c *.h | xargs $(TAGS_PROG) -a
283
284# Declare the contents of the .PHONY variable as phony. We keep that
285# information in a variable so we can use it in if_changed and friends.
286.PHONY: $(PHONY)
287
288# Delete partially updated (corrupted) files on error
289.DELETE_ON_ERROR:
290
291help:
292 @echo 'libbpf common targets:'
293 @echo ' HINT: use "V=1" to enable verbose build'
294 @echo ' all - build libraries and pkgconfig'
295 @echo ' clean - remove all generated files'
296 @echo ' check - check ABI and version info'
297 @echo ''
298 @echo 'libbpf install targets:'
299 @echo ' HINT: use "prefix"(defaults to "/usr/local") or "DESTDIR" (defaults to "/")'
300 @echo ' to adjust target destination, e.g. "make prefix=/usr/local install"'
301 @echo ' install - build and install all headers, libraries and pkgconfig'
302 @echo ' install_headers - install only headers to include/bpf'
303 @echo ''
304 @echo 'libbpf make targets:'
305 @echo ' tags - use ctags to make tag information for source code browsing'
306 @echo ' cscope - use cscope to make interactive source code browsing database'
1# Most of this file is copied from tools/lib/traceevent/Makefile
2
3BPF_VERSION = 0
4BPF_PATCHLEVEL = 0
5BPF_EXTRAVERSION = 1
6
7MAKEFLAGS += --no-print-directory
8
9ifeq ($(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)