1 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2 # Most of this file is copied from tools/lib/traceevent/Makefile
8 MAKEFLAGS += --no-print-directory
11 srctree := $(patsubst %/,%,$(dir $(CURDIR)))
12 srctree := $(patsubst %/,%,$(dir $(srctree)))
13 srctree := $(patsubst %/,%,$(dir $(srctree)))
14 #$(info Determined 'srctree' to be $(srctree))
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.
23 $(if $(or $(findstring environment,$(origin $(1))),\
24 $(findstring command line,$(origin $(1)))),,\
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)
34 # Use DESTDIR for installing into a different root directory.
35 # This is useful for building a package. The program will be
36 # installed in this directory as if it was the root directory.
37 # Then the build tool can move it later.
39 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
41 include $(srctree)/tools/scripts/Makefile.arch
44 libdir_relative = lib64
50 libdir = $(prefix)/$(libdir_relative)
51 man_dir = $(prefix)/share/man
52 man_dir_SQ = '$(subst ','\'',$(man_dir))'
54 export man_dir man_dir_SQ INSTALL
55 export DESTDIR DESTDIR_SQ
57 include ../../scripts/Makefile.include
59 # copy a bit from Linux kbuild
61 ifeq ("$(origin V)", "command line")
68 FEATURE_USER = .libbpf
69 FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx
70 FEATURE_DISPLAY = libelf bpf
72 INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
73 FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
76 NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
78 ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
83 ifeq ($(check_feat),1)
84 ifeq ($(FEATURES_DUMP),)
85 include $(srctree)/tools/build/Makefile.feature
87 include $(FEATURES_DUMP)
91 export prefix libdir src obj
94 libdir_SQ = $(subst ','\'',$(libdir))
95 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
97 LIB_FILE = libbpf.a libbpf.so
99 VERSION = $(BPF_VERSION)
100 PATCHLEVEL = $(BPF_PATCHLEVEL)
101 EXTRAVERSION = $(BPF_EXTRAVERSION)
106 LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
108 # Set compile option CFLAGS
110 CFLAGS := $(EXTRA_CFLAGS)
115 ifeq ($(feature-libelf-mmap), 1)
116 override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
119 ifeq ($(feature-reallocarray), 0)
120 override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
123 # Append required CFLAGS
124 override CFLAGS += $(EXTRA_WARNINGS)
125 override CFLAGS += -Werror -Wall
126 override CFLAGS += -fPIC
127 override CFLAGS += $(INCLUDES)
128 override CFLAGS += -fvisibility=hidden
136 # Disable command line variables (CFLAGS) override from top
137 # level Makefile (perf), otherwise build Makefile will get
138 # the same command line setup.
143 export srctree OUTPUT CC LD CFLAGS V
144 include $(srctree)/tools/build/Makefile.include
146 BPF_IN := $(OUTPUT)libbpf-in.o
147 LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
148 VERSION_SCRIPT := libbpf.map
150 GLOBAL_SYM_COUNT = $(shell readelf -s $(BPF_IN) | \
151 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print s}')
152 VERSIONED_SYM_COUNT = $(shell readelf -s $(OUTPUT)libbpf.so | \
153 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
155 CMD_TARGETS = $(LIB_FILE)
157 CXX_TEST_TARGET = $(OUTPUT)test_libbpf
159 ifeq ($(feature-cxx), 1)
160 CMD_TARGETS += $(CXX_TEST_TARGET)
163 TARGETS = $(CMD_TARGETS)
167 all_cmd: $(CMD_TARGETS) check
169 $(BPF_IN): force elfdep bpfdep
170 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
171 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
172 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
173 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
174 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
175 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
176 @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
177 (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
178 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
179 @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
180 (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
181 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
182 $(Q)$(MAKE) $(build)=libbpf
184 $(OUTPUT)libbpf.so: $(BPF_IN)
185 $(QUIET_LINK)$(CC) --shared -Wl,--version-script=$(VERSION_SCRIPT) \
188 $(OUTPUT)libbpf.a: $(BPF_IN)
189 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
191 $(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a
192 $(QUIET_LINK)$(CXX) $^ -lelf -o $@
196 check_abi: $(OUTPUT)libbpf.so
197 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
198 echo "Warning: Num of global symbols in $(BPF_IN)" \
199 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \
200 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
201 "Please make sure all LIBBPF_API symbols are" \
202 "versioned in $(VERSION_SCRIPT)." >&2; \
207 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
208 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
210 $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
214 $(call QUIET_INSTALL, $(LIB_FILE)) \
215 $(call do_install,$(LIB_FILE),$(libdir_SQ))
218 $(call QUIET_INSTALL, headers) \
219 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \
220 $(call do_install,libbpf.h,$(prefix)/include/bpf,644);
221 $(call do_install,btf.h,$(prefix)/include/bpf,644);
228 $(call QUIET_CLEAN, config)
229 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
232 $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
233 *.o *~ *.a *.so .*.d .*.cmd LIBBPF-CFLAGS
234 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
238 PHONY += force elfdep bpfdep
242 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
245 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
247 # Declare the contents of the .PHONY variable as phony. We keep that
248 # information in a variable so we can use it in if_changed and friends.