1 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2- !! 1 # SPDX-License-Identifier: GPL-2.0
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 = 1
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
>> 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.
>> 22 define allow-override
>> 23 $(if $(or $(findstring environment,$(origin $(1))),\
>> 24 $(findstring command line,$(origin $(1)))),,\
>> 25 $(eval $(1) = $(2)))
>> 26 endef
>> 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
27 INSTALL = install 32 INSTALL = install
28 33
29 # Use DESTDIR for installing into a different 34 # Use DESTDIR for installing into a different root directory.
30 # This is useful for building a package. The p 35 # This is useful for building a package. The program will be
31 # installed in this directory as if it was the 36 # installed in this directory as if it was the root directory.
32 # Then the build tool can move it later. 37 # Then the build tool can move it later.
33 DESTDIR ?= 38 DESTDIR ?=
34 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))' 39 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
35 40
36 include $(srctree)/tools/scripts/Makefile.arch 41 include $(srctree)/tools/scripts/Makefile.arch
37 42
38 ifeq ($(LP64), 1) 43 ifeq ($(LP64), 1)
39 libdir_relative = lib64 44 libdir_relative = lib64
40 else 45 else
41 libdir_relative = lib 46 libdir_relative = lib
42 endif 47 endif
43 48
44 prefix ?= /usr/local 49 prefix ?= /usr/local
45 libdir = $(prefix)/$(libdir_relative) 50 libdir = $(prefix)/$(libdir_relative)
46 man_dir = $(prefix)/share/man 51 man_dir = $(prefix)/share/man
47 man_dir_SQ = '$(subst ','\'',$(man_dir))' 52 man_dir_SQ = '$(subst ','\'',$(man_dir))'
48 53
49 export man_dir man_dir_SQ INSTALL 54 export man_dir man_dir_SQ INSTALL
50 export DESTDIR DESTDIR_SQ 55 export DESTDIR DESTDIR_SQ
51 56
52 include $(srctree)/tools/scripts/Makefile.incl !! 57 include ../../scripts/Makefile.include
53 58
54 # copy a bit from Linux kbuild 59 # copy a bit from Linux kbuild
55 60
56 ifeq ("$(origin V)", "command line") 61 ifeq ("$(origin V)", "command line")
57 VERBOSE = $(V) 62 VERBOSE = $(V)
58 endif 63 endif
59 ifndef VERBOSE 64 ifndef VERBOSE
60 VERBOSE = 0 65 VERBOSE = 0
61 endif 66 endif
62 67
63 INCLUDES = -I$(or $(OUTPUT),.) \ !! 68 FEATURE_USER = .libbpf
64 -I$(srctree)/tools/include -I$(srct !! 69 FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf
>> 70 FEATURE_DISPLAY = libelf bpf
>> 71
>> 72 INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
>> 73 FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
>> 74
>> 75 check_feat := 1
>> 76 NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
>> 77 ifdef MAKECMDGOALS
>> 78 ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
>> 79 check_feat := 0
>> 80 endif
>> 81 endif
>> 82
>> 83 ifeq ($(check_feat),1)
>> 84 ifeq ($(FEATURES_DUMP),)
>> 85 include $(srctree)/tools/build/Makefile.feature
>> 86 else
>> 87 include $(FEATURES_DUMP)
>> 88 endif
>> 89 endif
65 90
66 export prefix libdir src obj 91 export prefix libdir src obj
67 92
68 # Shell quotes 93 # Shell quotes
69 libdir_SQ = $(subst ','\'',$(libdir)) 94 libdir_SQ = $(subst ','\'',$(libdir))
70 libdir_relative_SQ = $(subst ','\'',$(libdir_r 95 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
>> 96 plugin_dir_SQ = $(subst ','\'',$(plugin_dir))
>> 97
>> 98 LIB_FILE = libbpf.a libbpf.so
>> 99
>> 100 VERSION = $(BPF_VERSION)
>> 101 PATCHLEVEL = $(BPF_PATCHLEVEL)
>> 102 EXTRAVERSION = $(BPF_EXTRAVERSION)
71 103
72 OBJ = $@ 104 OBJ = $@
73 N = 105 N =
74 106
75 LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_ !! 107 LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
76 LIB_FILE = libbpf.a libbpf.so* <<
77 PC_FILE = libbpf.pc <<
78 108
79 # Set compile option CFLAGS 109 # Set compile option CFLAGS
80 ifdef EXTRA_CFLAGS 110 ifdef EXTRA_CFLAGS
81 CFLAGS := $(EXTRA_CFLAGS) 111 CFLAGS := $(EXTRA_CFLAGS)
82 else 112 else
83 CFLAGS := -g -O2 !! 113 CFLAGS := -g -Wall
>> 114 endif
>> 115
>> 116 ifeq ($(feature-libelf-mmap), 1)
>> 117 override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
>> 118 endif
>> 119
>> 120 ifeq ($(feature-libelf-getphdrnum), 1)
>> 121 override CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT
84 endif 122 endif
85 123
86 # Append required CFLAGS 124 # Append required CFLAGS
87 override CFLAGS += -std=gnu89 !! 125 override CFLAGS += $(EXTRA_WARNINGS)
88 override CFLAGS += $(EXTRA_WARNINGS) -Wno-swit <<
89 override CFLAGS += -Werror -Wall 126 override CFLAGS += -Werror -Wall
>> 127 override CFLAGS += -fPIC
90 override CFLAGS += $(INCLUDES) 128 override CFLAGS += $(INCLUDES)
91 override CFLAGS += -fvisibility=hidden <<
92 override CFLAGS += -D_LARGEFILE64_SOURCE -D_FI <<
93 override CFLAGS += $(CLANG_CROSS_FLAGS) <<
94 <<
95 # flags specific for shared library <<
96 SHLIB_FLAGS := -DSHARED -fPIC <<
97 129
98 ifeq ($(VERBOSE),1) 130 ifeq ($(VERBOSE),1)
99 Q = 131 Q =
100 else 132 else
101 Q = @ 133 Q = @
102 endif 134 endif
103 135
104 # Disable command line variables (CFLAGS) over 136 # Disable command line variables (CFLAGS) override from top
105 # level Makefile (perf), otherwise build Makef 137 # level Makefile (perf), otherwise build Makefile will get
106 # the same command line setup. 138 # the same command line setup.
107 MAKEOVERRIDES= 139 MAKEOVERRIDES=
108 140
109 all: 141 all:
110 142
111 OUTPUT ?= ./ <<
112 OUTPUT := $(abspath $(OUTPUT))/ <<
113 export srctree OUTPUT CC LD CFLAGS V 143 export srctree OUTPUT CC LD CFLAGS V
114 include $(srctree)/tools/build/Makefile.includ 144 include $(srctree)/tools/build/Makefile.include
115 145
116 SHARED_OBJDIR := $(OUTPUT)sharedobjs/ !! 146 BPF_IN := $(OUTPUT)libbpf-in.o
117 STATIC_OBJDIR := $(OUTPUT)staticobjs/ !! 147 LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
118 BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o !! 148
119 BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o !! 149 CMD_TARGETS = $(LIB_FILE)
120 BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h <<
121 BPF_GENERATED := $(BPF_HELPER_DEFS) <<
122 <<
123 LIB_TARGET := $(addprefix $(OUTPUT),$(LIB <<
124 LIB_FILE := $(addprefix $(OUTPUT),$(LIB <<
125 PC_FILE := $(addprefix $(OUTPUT),$(PC_ <<
126 <<
127 TAGS_PROG := $(if $(shell which etags 2>/dev/n <<
128 <<
129 GLOBAL_SYM_COUNT = $(shell readelf -s --wide $ <<
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 '[^ ]+@ <<
138 <<
139 CMD_TARGETS = $(LIB_TARGET) $(PC_FILE) <<
140 <<
141 all: fixdep <<
142 $(Q)$(MAKE) all_cmd <<
143 150
144 all_cmd: $(CMD_TARGETS) check !! 151 TARGETS = $(CMD_TARGETS)
145 152
146 $(SHARED_OBJDIR) $(STATIC_OBJDIR): !! 153 all: fixdep $(VERSION_FILES) all_cmd
147 $(Q)mkdir -p $@ <<
148 154
149 $(BPF_IN_SHARED): force $(BPF_GENERATED) | $(S !! 155 all_cmd: $(CMD_TARGETS)
>> 156
>> 157 $(BPF_IN): force elfdep bpfdep
150 @(test -f ../../include/uapi/linux/bpf 158 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
151 (diff -B ../../include/uapi/linux/bpf. 159 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
152 echo "Warning: Kernel ABI header at 't 160 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 161 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
154 (diff -B ../../include/uapi/linux/bpf_ 162 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
155 echo "Warning: Kernel ABI header at 't 163 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
156 @(test -f ../../include/uapi/linux/if_ !! 164 $(Q)$(MAKE) $(build)=libbpf
157 (diff -B ../../include/uapi/linux/if_x !! 165
158 echo "Warning: Kernel ABI header at 't !! 166 $(OUTPUT)libbpf.so: $(BPF_IN)
159 $(SILENT_MAKE) -C $(srctree)/tools/bui !! 167 $(QUIET_LINK)$(CC) --shared $^ -o $@
160 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(S !! 168
161 !! 169 $(OUTPUT)libbpf.a: $(BPF_IN)
162 $(BPF_IN_STATIC): force $(BPF_GENERATED) | $(S !! 170 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
163 $(SILENT_MAKE) -C $(srctree)/tools/bui !! 171
164 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(S !! 172 define update_dir
165 !! 173 (echo $1 > $@.tmp; \
166 $(BPF_HELPER_DEFS): $(srctree)/tools/include/u !! 174 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
167 $(QUIET_GEN)$(srctree)/scripts/bpf_doc !! 175 rm -f $@.tmp; \
168 --file $(srctree)/tools/includ !! 176 else \
169 !! 177 echo ' UPDATE $@'; \
170 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBP !! 178 mv -f $@.tmp $@; \
171 !! 179 fi);
172 $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN <<
173 $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS <<
174 --shared -Wl,-soname,libbpf.so <<
175 -Wl,--version-script=$(VERSION <<
176 @ln -sf $(@F) $(OUTPUT)libbpf.so <<
177 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIB <<
178 <<
179 $(OUTPUT)libbpf.a: $(BPF_IN_STATIC) <<
180 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ <<
181 <<
182 $(OUTPUT)libbpf.pc: <<
183 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefi <<
184 -e "s|@LIBDIR@|$(libdir_SQ)|" <<
185 -e "s|@VERSION@|$(LIBBPF_VERSI <<
186 < libbpf.pc.template > $@ <<
187 <<
188 check: check_abi check_version <<
189 <<
190 check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT <<
191 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERS <<
192 echo "Warning: Num of global s <<
193 "($(GLOBAL_SYM_COUNT)) do <<
194 "versioned symbols in $^ <<
195 "Please make sure all LIB <<
196 "versioned in $(VERSION_S <<
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; <<
212 fi <<
213 <<
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 "'$(HDR_MIN_VERSION)' != <<
226 exit 1; <<
227 fi <<
228 <<
229 define do_install_mkdir <<
230 if [ ! -d '$(DESTDIR_SQ)$1' ]; then <<
231 $(INSTALL) -d -m 755 '$(DESTDI <<
232 fi <<
233 endef 180 endef
234 181
235 define do_install 182 define do_install
236 if [ ! -d '$(DESTDIR_SQ)$2' ]; then 183 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
237 $(INSTALL) -d -m 755 '$(DESTDI 184 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
238 fi; 185 fi; \
239 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTD 186 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
240 endef 187 endef
241 188
242 install_lib: all_cmd 189 install_lib: all_cmd
243 $(call QUIET_INSTALL, $(LIB_TARGET)) \ !! 190 $(call QUIET_INSTALL, $(LIB_FILE)) \
244 $(call do_install_mkdir,$(libd !! 191 $(call do_install,$(LIB_FILE),$(libdir_SQ))
245 cp -fpR $(LIB_FILE) $(DESTDIR) !! 192
246 !! 193 install_headers:
247 SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common !! 194 $(call QUIET_INSTALL, headers) \
248 bpf_helpers.h bpf_tracing.h bpf_en !! 195 $(call do_install,bpf.h,$(prefix)/include/bpf,644)
249 skel_internal.h libbpf_version.h u !! 196
250 GEN_HDRS := $(BPF_GENERATED) !! 197 install: install_lib
251 <<
252 INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf <<
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. <<
279 198
280 PHONY += force cscope tags check check_abi che !! 199 ### Cleaning rules
>> 200
>> 201 config-clean:
>> 202 $(call QUIET_CLEAN, config)
>> 203 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
>> 204
>> 205 clean:
>> 206 $(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d .*.cmd \
>> 207 $(RM) LIBBPF-CFLAGS
>> 208 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
>> 209
>> 210
>> 211
>> 212 PHONY += force elfdep bpfdep
281 force: 213 force:
282 214
283 cscope: !! 215 elfdep:
284 ls *.c *.h > cscope.files !! 216 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit -1 ; fi
285 cscope -b -q -I $(srctree)/include -f !! 217
286 !! 218 bpfdep:
287 tags: !! 219 @if [ "$(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 <<
290 220
291 # Declare the contents of the .PHONY variable 221 # Declare the contents of the .PHONY variable as phony. We keep that
292 # information in a variable so we can use it i 222 # information in a variable so we can use it in if_changed and friends.
293 .PHONY: $(PHONY) 223 .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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