1 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2 # Most of this file is copied from tools/lib/traceevent/Makefile
5 srctree = $(abs_srctree)
7 VERSION_SCRIPT := libbpf.map
8 LIBBPF_VERSION := $(shell \
9 grep -oE '^LIBBPF_([0-9.]+)' $(VERSION_SCRIPT) | \
10 sort -rV | head -n1 | cut -d'_' -f2)
11 LIBBPF_MAJOR_VERSION := $(firstword $(subst ., ,$(LIBBPF_VERSION)))
13 MAKEFLAGS += --no-print-directory
15 # This will work when bpf is built in tools env. where srctree
16 # isn't set and when invoked from selftests build, where srctree
17 # is a ".". building_out_of_srctree is undefined for in srctree
19 ifndef building_out_of_srctree
20 srctree := $(patsubst %/,%,$(dir $(CURDIR)))
21 srctree := $(patsubst %/,%,$(dir $(srctree)))
22 srctree := $(patsubst %/,%,$(dir $(srctree)))
23 #$(info Determined 'srctree' to be $(srctree))
28 # Use DESTDIR for installing into a different root directory.
29 # This is useful for building a package. The program will be
30 # installed in this directory as if it was the root directory.
31 # Then the build tool can move it later.
33 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
35 include $(srctree)/tools/scripts/Makefile.arch
38 libdir_relative = lib64
44 libdir = $(prefix)/$(libdir_relative)
45 man_dir = $(prefix)/share/man
46 man_dir_SQ = '$(subst ','\'',$(man_dir))'
48 export man_dir man_dir_SQ INSTALL
49 export DESTDIR DESTDIR_SQ
51 include $(srctree)/tools/scripts/Makefile.include
53 # copy a bit from Linux kbuild
55 ifeq ("$(origin V)", "command line")
62 FEATURE_USER = .libbpf
63 FEATURE_TESTS = libelf zlib bpf
64 FEATURE_DISPLAY = libelf zlib bpf
66 INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi
67 FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
70 NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
72 ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
77 ifeq ($(check_feat),1)
78 ifeq ($(FEATURES_DUMP),)
79 include $(srctree)/tools/build/Makefile.feature
81 include $(FEATURES_DUMP)
85 export prefix libdir src obj
88 libdir_SQ = $(subst ','\'',$(libdir))
89 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
94 LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)
95 LIB_FILE = libbpf.a libbpf.so*
98 # Set compile option CFLAGS
100 CFLAGS := $(EXTRA_CFLAGS)
105 # Append required CFLAGS
106 override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
107 override CFLAGS += -Werror -Wall
108 override CFLAGS += $(INCLUDES)
109 override CFLAGS += -fvisibility=hidden
110 override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
112 # flags specific for shared library
113 SHLIB_FLAGS := -DSHARED -fPIC
121 # Disable command line variables (CFLAGS) override from top
122 # level Makefile (perf), otherwise build Makefile will get
123 # the same command line setup.
128 export srctree OUTPUT CC LD CFLAGS V
129 include $(srctree)/tools/build/Makefile.include
131 SHARED_OBJDIR := $(OUTPUT)sharedobjs/
132 STATIC_OBJDIR := $(OUTPUT)staticobjs/
133 BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o
134 BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o
135 BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
137 LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
138 LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
139 PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))
141 TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
143 GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \
144 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
146 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \
148 VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
150 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
151 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
153 CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
158 all_cmd: $(CMD_TARGETS) check
160 $(BPF_IN_SHARED): force elfdep zdep bpfdep $(BPF_HELPER_DEFS)
161 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
162 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
163 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
164 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
165 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
166 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
167 @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
168 (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
169 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
170 @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
171 (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
172 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
173 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
174 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
175 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
176 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
178 $(BPF_IN_STATIC): force elfdep zdep bpfdep $(BPF_HELPER_DEFS)
179 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
181 $(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
182 $(QUIET_GEN)$(srctree)/scripts/bpf_helpers_doc.py --header \
183 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
185 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
187 $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)
188 $(QUIET_LINK)$(CC) $(LDFLAGS) \
189 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
190 -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@
191 @ln -sf $(@F) $(OUTPUT)libbpf.so
192 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
194 $(OUTPUT)libbpf.a: $(BPF_IN_STATIC)
195 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^
198 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
199 -e "s|@LIBDIR@|$(libdir_SQ)|" \
200 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \
201 < libbpf.pc.template > $@
205 check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)
206 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
207 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \
208 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \
209 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
210 "Please make sure all LIBBPF_API symbols are" \
211 "versioned in $(VERSION_SCRIPT)." >&2; \
212 readelf -s --wide $(BPF_IN_SHARED) | \
213 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
215 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
216 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
217 readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
219 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'| \
220 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
221 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
222 diff -u $(OUTPUT)libbpf_global_syms.tmp \
223 $(OUTPUT)libbpf_versioned_syms.tmp; \
224 rm $(OUTPUT)libbpf_global_syms.tmp \
225 $(OUTPUT)libbpf_versioned_syms.tmp; \
229 define do_install_mkdir
230 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
231 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
236 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
237 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
239 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
243 $(call QUIET_INSTALL, $(LIB_TARGET)) \
244 $(call do_install_mkdir,$(libdir_SQ)); \
245 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
247 install_headers: $(BPF_HELPER_DEFS)
248 $(call QUIET_INSTALL, headers) \
249 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \
250 $(call do_install,libbpf.h,$(prefix)/include/bpf,644); \
251 $(call do_install,btf.h,$(prefix)/include/bpf,644); \
252 $(call do_install,libbpf_util.h,$(prefix)/include/bpf,644); \
253 $(call do_install,libbpf_common.h,$(prefix)/include/bpf,644); \
254 $(call do_install,xsk.h,$(prefix)/include/bpf,644); \
255 $(call do_install,bpf_helpers.h,$(prefix)/include/bpf,644); \
256 $(call do_install,$(BPF_HELPER_DEFS),$(prefix)/include/bpf,644); \
257 $(call do_install,bpf_tracing.h,$(prefix)/include/bpf,644); \
258 $(call do_install,bpf_endian.h,$(prefix)/include/bpf,644); \
259 $(call do_install,bpf_core_read.h,$(prefix)/include/bpf,644);
261 install_pkgconfig: $(PC_FILE)
262 $(call QUIET_INSTALL, $(PC_FILE)) \
263 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
265 install: install_lib install_pkgconfig install_headers
270 $(call QUIET_CLEAN, feature-detect)
271 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
274 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \
275 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_HELPER_DEFS) \
276 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \
277 $(addprefix $(OUTPUT), \
278 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
279 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
283 PHONY += force elfdep zdep bpfdep cscope tags
287 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
290 @if [ "$(feature-zlib)" != "1" ]; then echo "No zlib found"; exit 1 ; fi
293 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
296 ls *.c *.h > cscope.files
297 cscope -b -q -I $(srctree)/include -f cscope.out
301 ls *.c *.h | xargs $(TAGS_PROG) -a
303 # Declare the contents of the .PHONY variable as phony. We keep that
304 # information in a variable so we can use it in if_changed and friends.
307 # Delete partially updated (corrupted) files on error