1 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2- <<
2 # Most of this file is copied from tools/lib/t 1 # Most of this file is copied from tools/lib/traceevent/Makefile
3 2
4 RM ?= rm !! 3 BPF_VERSION = 0
5 srctree := $(realpath $(srctree)) !! 4 BPF_PATCHLEVEL = 0
6 !! 5 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 6
14 MAKEFLAGS += --no-print-directory 7 MAKEFLAGS += --no-print-directory
15 8
16 # This will work when bpf is built in tools en !! 9
17 # isn't set and when invoked from selftests bu !! 10 # Makefiles suck: This macro sets a default value of $(2) for the
18 # is a ".". building_out_of_srctree is undefin !! 11 # variable named by $(1), unless the variable has been set by
19 # builds !! 12 # environment or command line. This is necessary for CC and AR
20 ifndef building_out_of_srctree !! 13 # because make sets default values, so the simpler ?= approach
21 srctree := $(patsubst %/,%,$(dir $(CURDIR))) !! 14 # won't work as expected.
22 srctree := $(patsubst %/,%,$(dir $(srctree))) !! 15 define allow-override
23 srctree := $(patsubst %/,%,$(dir $(srctree))) !! 16 $(if $(or $(findstring environment,$(origin $(1))),\
24 #$(info Determined 'srctree' to be $(srctree)) !! 17 $(findstring command line,$(origin $(1)))),,\
25 endif !! 18 $(eval $(1) = $(2)))
>> 19 endef
>> 20
>> 21 # Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
>> 22 $(call allow-override,CC,$(CROSS_COMPILE)gcc)
>> 23 $(call allow-override,AR,$(CROSS_COMPILE)ar)
26 24
27 INSTALL = install 25 INSTALL = install
28 26
29 # Use DESTDIR for installing into a different 27 # Use DESTDIR for installing into a different root directory.
30 # This is useful for building a package. The p 28 # This is useful for building a package. The program will be
31 # installed in this directory as if it was the 29 # installed in this directory as if it was the root directory.
32 # Then the build tool can move it later. 30 # Then the build tool can move it later.
33 DESTDIR ?= 31 DESTDIR ?=
34 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))' 32 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
35 33
36 include $(srctree)/tools/scripts/Makefile.arch !! 34 LP64 := $(shell echo __LP64__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1)
37 <<
38 ifeq ($(LP64), 1) 35 ifeq ($(LP64), 1)
39 libdir_relative = lib64 36 libdir_relative = lib64
40 else 37 else
41 libdir_relative = lib 38 libdir_relative = lib
42 endif 39 endif
43 40
44 prefix ?= /usr/local 41 prefix ?= /usr/local
45 libdir = $(prefix)/$(libdir_relative) 42 libdir = $(prefix)/$(libdir_relative)
46 man_dir = $(prefix)/share/man 43 man_dir = $(prefix)/share/man
47 man_dir_SQ = '$(subst ','\'',$(man_dir))' 44 man_dir_SQ = '$(subst ','\'',$(man_dir))'
48 45
49 export man_dir man_dir_SQ INSTALL 46 export man_dir man_dir_SQ INSTALL
50 export DESTDIR DESTDIR_SQ 47 export DESTDIR DESTDIR_SQ
51 48
52 include $(srctree)/tools/scripts/Makefile.incl !! 49 include ../../scripts/Makefile.include
53 50
54 # copy a bit from Linux kbuild 51 # copy a bit from Linux kbuild
55 52
56 ifeq ("$(origin V)", "command line") 53 ifeq ("$(origin V)", "command line")
57 VERBOSE = $(V) 54 VERBOSE = $(V)
58 endif 55 endif
59 ifndef VERBOSE 56 ifndef VERBOSE
60 VERBOSE = 0 57 VERBOSE = 0
61 endif 58 endif
62 59
63 INCLUDES = -I$(or $(OUTPUT),.) \ !! 60 ifeq ($(srctree),)
64 -I$(srctree)/tools/include -I$(srct !! 61 srctree := $(patsubst %/,%,$(dir $(shell pwd)))
>> 62 srctree := $(patsubst %/,%,$(dir $(srctree)))
>> 63 srctree := $(patsubst %/,%,$(dir $(srctree)))
>> 64 #$(info Determined 'srctree' to be $(srctree))
>> 65 endif
>> 66
>> 67 FEATURE_USER = .libbpf
>> 68 FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf
>> 69 FEATURE_DISPLAY = libelf bpf
>> 70
>> 71 INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/arch/$(ARCH)/include/uapi -I$(srctree)/include/uapi
>> 72 FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
>> 73
>> 74 include $(srctree)/tools/build/Makefile.feature
65 75
66 export prefix libdir src obj 76 export prefix libdir src obj
67 77
68 # Shell quotes 78 # Shell quotes
69 libdir_SQ = $(subst ','\'',$(libdir)) 79 libdir_SQ = $(subst ','\'',$(libdir))
70 libdir_relative_SQ = $(subst ','\'',$(libdir_r 80 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
>> 81 plugin_dir_SQ = $(subst ','\'',$(plugin_dir))
>> 82
>> 83 LIB_FILE = libbpf.a libbpf.so
>> 84
>> 85 VERSION = $(BPF_VERSION)
>> 86 PATCHLEVEL = $(BPF_PATCHLEVEL)
>> 87 EXTRAVERSION = $(BPF_EXTRAVERSION)
71 88
72 OBJ = $@ 89 OBJ = $@
73 N = 90 N =
74 91
75 LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_ !! 92 LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
76 LIB_FILE = libbpf.a libbpf.so* <<
77 PC_FILE = libbpf.pc <<
78 93
79 # Set compile option CFLAGS 94 # Set compile option CFLAGS
80 ifdef EXTRA_CFLAGS 95 ifdef EXTRA_CFLAGS
81 CFLAGS := $(EXTRA_CFLAGS) 96 CFLAGS := $(EXTRA_CFLAGS)
82 else 97 else
83 CFLAGS := -g -O2 !! 98 CFLAGS := -g -Wall
>> 99 endif
>> 100
>> 101 ifeq ($(feature-libelf-mmap), 1)
>> 102 override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
>> 103 endif
>> 104
>> 105 ifeq ($(feature-libelf-getphdrnum), 1)
>> 106 override CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT
84 endif 107 endif
85 108
86 # Append required CFLAGS 109 # Append required CFLAGS
87 override CFLAGS += -std=gnu89 !! 110 override CFLAGS += $(EXTRA_WARNINGS)
88 override CFLAGS += $(EXTRA_WARNINGS) -Wno-swit <<
89 override CFLAGS += -Werror -Wall 111 override CFLAGS += -Werror -Wall
>> 112 override CFLAGS += -fPIC
90 override CFLAGS += $(INCLUDES) 113 override CFLAGS += $(INCLUDES)
91 override CFLAGS += -fvisibility=hidden <<
92 override CFLAGS += -D_LARGEFILE64_SOURCE -D_FI <<
93 override CFLAGS += $(CLANG_CROSS_FLAGS) <<
94 <<
95 # flags specific for shared library <<
96 SHLIB_FLAGS := -DSHARED -fPIC <<
97 114
98 ifeq ($(VERBOSE),1) 115 ifeq ($(VERBOSE),1)
99 Q = 116 Q =
100 else 117 else
101 Q = @ 118 Q = @
102 endif 119 endif
103 120
104 # Disable command line variables (CFLAGS) over !! 121 # Disable command line variables (CFLAGS) overide from top
105 # level Makefile (perf), otherwise build Makef 122 # level Makefile (perf), otherwise build Makefile will get
106 # the same command line setup. 123 # the same command line setup.
107 MAKEOVERRIDES= 124 MAKEOVERRIDES=
108 125
109 all: 126 all:
110 127
111 OUTPUT ?= ./ <<
112 OUTPUT := $(abspath $(OUTPUT))/ <<
113 export srctree OUTPUT CC LD CFLAGS V 128 export srctree OUTPUT CC LD CFLAGS V
114 include $(srctree)/tools/build/Makefile.includ 129 include $(srctree)/tools/build/Makefile.include
115 130
116 SHARED_OBJDIR := $(OUTPUT)sharedobjs/ !! 131 BPF_IN := $(OUTPUT)libbpf-in.o
117 STATIC_OBJDIR := $(OUTPUT)staticobjs/ !! 132 LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
118 BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o !! 133
119 BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o !! 134 CMD_TARGETS = $(LIB_FILE)
120 BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h !! 135
121 BPF_GENERATED := $(BPF_HELPER_DEFS) !! 136 TARGETS = $(CMD_TARGETS)
122 !! 137
123 LIB_TARGET := $(addprefix $(OUTPUT),$(LIB !! 138 all: fixdep $(VERSION_FILES) all_cmd
124 LIB_FILE := $(addprefix $(OUTPUT),$(LIB !! 139
125 PC_FILE := $(addprefix $(OUTPUT),$(PC_ !! 140 all_cmd: $(CMD_TARGETS)
126 !! 141
127 TAGS_PROG := $(if $(shell which etags 2>/dev/n !! 142 $(BPF_IN): force elfdep bpfdep
128 !! 143 $(Q)$(MAKE) $(build)=libbpf
129 GLOBAL_SYM_COUNT = $(shell readelf -s --wide $ !! 144
130 cut -d "@" -f1 | se !! 145 $(OUTPUT)libbpf.so: $(BPF_IN)
131 sed 's/\[.*\]//' | !! 146 $(QUIET_LINK)$(CC) --shared $^ -o $@
132 awk '/GLOBAL/ && /D !! 147
133 sort -u | wc -l) !! 148 $(OUTPUT)libbpf.a: $(BPF_IN)
134 VERSIONED_SYM_COUNT = $(shell readelf --dyn-sy !! 149 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
135 sed 's/\[.*\]//' !! 150
136 awk '/GLOBAL/ && !! 151 define update_dir
137 grep -Eo '[^ ]+@ !! 152 (echo $1 > $@.tmp; \
138 !! 153 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
139 CMD_TARGETS = $(LIB_TARGET) $(PC_FILE) !! 154 rm -f $@.tmp; \
140 !! 155 else \
141 all: fixdep !! 156 echo ' UPDATE $@'; \
142 $(Q)$(MAKE) all_cmd !! 157 mv -f $@.tmp $@; \
143 !! 158 fi);
144 all_cmd: $(CMD_TARGETS) check <<
145 <<
146 $(SHARED_OBJDIR) $(STATIC_OBJDIR): <<
147 $(Q)mkdir -p $@ <<
148 <<
149 $(BPF_IN_SHARED): force $(BPF_GENERATED) | $(S <<
150 @(test -f ../../include/uapi/linux/bpf <<
151 (diff -B ../../include/uapi/linux/bpf. <<
152 echo "Warning: Kernel ABI header at 't <<
153 @(test -f ../../include/uapi/linux/bpf <<
154 (diff -B ../../include/uapi/linux/bpf_ <<
155 echo "Warning: Kernel ABI header at 't <<
156 @(test -f ../../include/uapi/linux/if_ <<
157 (diff -B ../../include/uapi/linux/if_x <<
158 echo "Warning: Kernel ABI header at 't <<
159 $(SILENT_MAKE) -C $(srctree)/tools/bui <<
160 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(S <<
161 <<
162 $(BPF_IN_STATIC): force $(BPF_GENERATED) | $(S <<
163 $(SILENT_MAKE) -C $(srctree)/tools/bui <<
164 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(S <<
165 <<
166 $(BPF_HELPER_DEFS): $(srctree)/tools/include/u <<
167 $(QUIET_GEN)$(srctree)/scripts/bpf_doc <<
168 --file $(srctree)/tools/includ <<
169 <<
170 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBP <<
171 <<
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 159 endef
234 160
235 define do_install 161 define do_install
236 if [ ! -d '$(DESTDIR_SQ)$2' ]; then 162 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
237 $(INSTALL) -d -m 755 '$(DESTDI 163 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
238 fi; 164 fi; \
239 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTD !! 165 $(INSTALL) $1 '$(DESTDIR_SQ)$2'
240 endef 166 endef
241 167
242 install_lib: all_cmd 168 install_lib: all_cmd
243 $(call QUIET_INSTALL, $(LIB_TARGET)) \ !! 169 $(call QUIET_INSTALL, $(LIB_FILE)) \
244 $(call do_install_mkdir,$(libd !! 170 $(call do_install,$(LIB_FILE),$(libdir_SQ))
245 cp -fpR $(LIB_FILE) $(DESTDIR) !! 171
246 !! 172 install: install_lib
247 SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common !! 173
248 bpf_helpers.h bpf_tracing.h bpf_en !! 174 ### Cleaning rules
249 skel_internal.h libbpf_version.h u !! 175
250 GEN_HDRS := $(BPF_GENERATED) !! 176 config-clean:
251 !! 177 $(call QUIET_CLEAN, config)
252 INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf !! 178 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
253 INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX) !! 179
254 INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX) !! 180 clean:
255 !! 181 $(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d \
256 $(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h !! 182 $(RM) LIBBPF-CFLAGS
257 $(call QUIET_INSTALL, $@) \ !! 183 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
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 $(OUTPUT), <<
278 *.o *.a *.so *.so. <<
279 184
280 PHONY += force cscope tags check check_abi che !! 185
>> 186
>> 187 PHONY += force elfdep bpfdep
281 force: 188 force:
282 189
283 cscope: !! 190 elfdep:
284 ls *.c *.h > cscope.files !! 191 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit -1 ; fi
285 cscope -b -q -I $(srctree)/include -f !! 192
286 !! 193 bpfdep:
287 tags: !! 194 @if [ "$(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 <<
290 195
291 # Declare the contents of the .PHONY variable 196 # Declare the contents of the .PHONY variable as phony. We keep that
292 # information in a variable so we can use it i 197 # information in a variable so we can use it in if_changed and friends.
293 .PHONY: $(PHONY) 198 .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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