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 LIBBPF_VERSION := $(shell \
8 grep -oE '^LIBBPF_([0-9.]+)' libbpf.map | \
9 sort -rV | head -n1 | cut -d'_' -f2)
10 LIBBPF_MAJOR_VERSION := $(firstword $(subst ., ,$(LIBBPF_VERSION)))
12 MAKEFLAGS += --no-print-directory
14 # This will work when bpf is built in tools env. where srctree
15 # isn't set and when invoked from selftests build, where srctree
16 # is a ".". building_out_of_srctree is undefined for in srctree
18 ifndef building_out_of_srctree
19 srctree := $(patsubst %/,%,$(dir $(CURDIR)))
20 srctree := $(patsubst %/,%,$(dir $(srctree)))
21 srctree := $(patsubst %/,%,$(dir $(srctree)))
22 #$(info Determined 'srctree' to be $(srctree))
27 # Use DESTDIR for installing into a different root directory.
28 # This is useful for building a package. The program will be
29 # installed in this directory as if it was the root directory.
30 # Then the build tool can move it later.
32 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
34 include $(srctree)/tools/scripts/Makefile.arch
37 libdir_relative = lib64
43 libdir = $(prefix)/$(libdir_relative)
44 man_dir = $(prefix)/share/man
45 man_dir_SQ = '$(subst ','\'',$(man_dir))'
47 export man_dir man_dir_SQ INSTALL
48 export DESTDIR DESTDIR_SQ
50 include $(srctree)/tools/scripts/Makefile.include
52 # copy a bit from Linux kbuild
54 ifeq ("$(origin V)", "command line")
61 INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi
63 export prefix libdir src obj
66 libdir_SQ = $(subst ','\'',$(libdir))
67 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
72 LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)
73 LIB_FILE = libbpf.a libbpf.so*
76 # Set compile option CFLAGS
78 CFLAGS := $(EXTRA_CFLAGS)
83 # Append required CFLAGS
84 override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
85 override CFLAGS += -Werror -Wall
86 override CFLAGS += $(INCLUDES)
87 override CFLAGS += -fvisibility=hidden
88 override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
90 # flags specific for shared library
91 SHLIB_FLAGS := -DSHARED -fPIC
99 # Disable command line variables (CFLAGS) override from top
100 # level Makefile (perf), otherwise build Makefile will get
101 # the same command line setup.
106 export srctree OUTPUT CC LD CFLAGS V
107 include $(srctree)/tools/build/Makefile.include
109 SHARED_OBJDIR := $(OUTPUT)sharedobjs/
110 STATIC_OBJDIR := $(OUTPUT)staticobjs/
111 BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o
112 BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o
113 VERSION_SCRIPT := libbpf.map
114 BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
116 LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
117 LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
118 PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))
120 TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
122 GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \
123 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
125 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \
127 VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
129 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \
130 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
132 CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
137 all_cmd: $(CMD_TARGETS) check
139 $(BPF_IN_SHARED): force $(BPF_HELPER_DEFS)
140 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
141 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
142 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
143 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
144 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
145 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
146 @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
147 (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
148 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
149 @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
150 (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
151 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
152 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
153 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
154 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
155 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
157 $(BPF_IN_STATIC): force $(BPF_HELPER_DEFS)
158 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
160 $(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
161 $(QUIET_GEN)$(srctree)/scripts/bpf_helpers_doc.py --header \
162 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
164 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
166 $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED)
167 $(QUIET_LINK)$(CC) $(LDFLAGS) \
168 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
169 -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -lz -o $@
170 @ln -sf $(@F) $(OUTPUT)libbpf.so
171 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
173 $(OUTPUT)libbpf.a: $(BPF_IN_STATIC)
174 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^
177 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
178 -e "s|@LIBDIR@|$(libdir_SQ)|" \
179 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \
180 < libbpf.pc.template > $@
184 check_abi: $(OUTPUT)libbpf.so
185 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
186 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \
187 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \
188 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
189 "Please make sure all LIBBPF_API symbols are" \
190 "versioned in $(VERSION_SCRIPT)." >&2; \
191 readelf -s --wide $(BPF_IN_SHARED) | \
192 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
194 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
195 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
196 readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
198 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
199 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
200 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
201 diff -u $(OUTPUT)libbpf_global_syms.tmp \
202 $(OUTPUT)libbpf_versioned_syms.tmp; \
203 rm $(OUTPUT)libbpf_global_syms.tmp \
204 $(OUTPUT)libbpf_versioned_syms.tmp; \
208 define do_install_mkdir
209 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
210 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
215 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
216 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
218 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
222 $(call QUIET_INSTALL, $(LIB_TARGET)) \
223 $(call do_install_mkdir,$(libdir_SQ)); \
224 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
226 install_headers: $(BPF_HELPER_DEFS)
227 $(call QUIET_INSTALL, headers) \
228 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \
229 $(call do_install,libbpf.h,$(prefix)/include/bpf,644); \
230 $(call do_install,btf.h,$(prefix)/include/bpf,644); \
231 $(call do_install,libbpf_util.h,$(prefix)/include/bpf,644); \
232 $(call do_install,libbpf_common.h,$(prefix)/include/bpf,644); \
233 $(call do_install,xsk.h,$(prefix)/include/bpf,644); \
234 $(call do_install,bpf_helpers.h,$(prefix)/include/bpf,644); \
235 $(call do_install,$(BPF_HELPER_DEFS),$(prefix)/include/bpf,644); \
236 $(call do_install,bpf_tracing.h,$(prefix)/include/bpf,644); \
237 $(call do_install,bpf_endian.h,$(prefix)/include/bpf,644); \
238 $(call do_install,bpf_core_read.h,$(prefix)/include/bpf,644);
240 install_pkgconfig: $(PC_FILE)
241 $(call QUIET_INSTALL, $(PC_FILE)) \
242 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
244 install: install_lib install_pkgconfig install_headers
247 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \
248 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_HELPER_DEFS) \
249 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \
250 $(addprefix $(OUTPUT), \
251 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
253 PHONY += force cscope tags
257 ls *.c *.h > cscope.files
258 cscope -b -q -I $(srctree)/include -f cscope.out
262 ls *.c *.h | xargs $(TAGS_PROG) -a
264 # Declare the contents of the .PHONY variable as phony. We keep that
265 # information in a variable so we can use it in if_changed and friends.
268 # Delete partially updated (corrupted) files on error