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1# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2
3ifeq ($(V),1)
4	Q =
5	msg =
6else
7	Q = @
8	msg = @printf '  %-8s %s%s\n' "$(1)" "$(2)" "$(if $(3), $(3))";
9endif
10
11LIBBPF_MAJOR_VERSION := 1
12LIBBPF_MINOR_VERSION := 1
13LIBBPF_PATCH_VERSION := 0
14LIBBPF_VERSION := $(LIBBPF_MAJOR_VERSION).$(LIBBPF_MINOR_VERSION).$(LIBBPF_PATCH_VERSION)
15LIBBPF_MAJMIN_VERSION := $(LIBBPF_MAJOR_VERSION).$(LIBBPF_MINOR_VERSION).0
16LIBBPF_MAP_VERSION := $(shell grep -oE '^LIBBPF_([0-9.]+)' libbpf.map | sort -rV | head -n1 | cut -d'_' -f2)
17ifneq ($(LIBBPF_MAJMIN_VERSION), $(LIBBPF_MAP_VERSION))
18$(error Libbpf release ($(LIBBPF_VERSION)) and map ($(LIBBPF_MAP_VERSION)) versions are out of sync!)
19endif
20
21define allow-override
22  $(if $(or $(findstring environment,$(origin $(1))),\
23            $(findstring command line,$(origin $(1)))),,\
24    $(eval $(1) = $(2)))
25endef
26
27$(call allow-override,CC,$(CROSS_COMPILE)cc)
28$(call allow-override,LD,$(CROSS_COMPILE)ld)
29
30TOPDIR = ..
31
32INCLUDES := -I. -I$(TOPDIR)/include -I$(TOPDIR)/include/uapi
33ALL_CFLAGS := $(INCLUDES)
34
35SHARED_CFLAGS += -fPIC -fvisibility=hidden -DSHARED
36
37CFLAGS ?= -g -O2 -Werror -Wall -std=gnu89
38ALL_CFLAGS += $(CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 $(EXTRA_CFLAGS)
39ALL_LDFLAGS += $(LDFLAGS) $(EXTRA_LDFLAGS)
40
41ifdef NO_PKG_CONFIG
42	ALL_LDFLAGS += -lelf -lz
43else
44	PKG_CONFIG ?= pkg-config
45	ALL_CFLAGS += $(shell $(PKG_CONFIG) --cflags libelf zlib)
46	ALL_LDFLAGS += $(shell $(PKG_CONFIG) --libs libelf zlib)
47endif
48
49OBJDIR ?= .
50SHARED_OBJDIR := $(OBJDIR)/sharedobjs
51STATIC_OBJDIR := $(OBJDIR)/staticobjs
52OBJS := bpf.o btf.o libbpf.o libbpf_errno.o netlink.o \
53	nlattr.o str_error.o libbpf_probes.o bpf_prog_linfo.o \
54	btf_dump.o hashmap.o ringbuf.o strset.o linker.o gen_loader.o \
55	relo_core.o usdt.o
56SHARED_OBJS := $(addprefix $(SHARED_OBJDIR)/,$(OBJS))
57STATIC_OBJS := $(addprefix $(STATIC_OBJDIR)/,$(OBJS))
58
59STATIC_LIBS := $(OBJDIR)/libbpf.a
60ifndef BUILD_STATIC_ONLY
61	SHARED_LIBS := $(OBJDIR)/libbpf.so \
62		       $(OBJDIR)/libbpf.so.$(LIBBPF_MAJOR_VERSION) \
63		       $(OBJDIR)/libbpf.so.$(LIBBPF_VERSION)
64	VERSION_SCRIPT := libbpf.map
65endif
66
67HEADERS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h \
68	   bpf_helpers.h bpf_helper_defs.h bpf_tracing.h \
69	   bpf_endian.h bpf_core_read.h skel_internal.h libbpf_version.h \
70	   usdt.bpf.h
71UAPI_HEADERS := $(addprefix $(TOPDIR)/include/uapi/linux/,\
72			    bpf.h bpf_common.h btf.h)
73
74PC_FILE := $(OBJDIR)/libbpf.pc
75
76INSTALL = install
77
78DESTDIR ?=
79
80HOSTARCH = $(firstword $(subst -, ,$(shell $(CC) -dumpmachine)))
81ifeq ($(filter-out %64 %64be %64eb %64le %64el s390x, $(HOSTARCH)),)
82	LIBSUBDIR := lib64
83else
84	LIBSUBDIR := lib
85endif
86
87# By default let the pc file itself use ${prefix} in includedir/libdir so that
88# the prefix can be overridden at runtime (eg: --define-prefix)
89ifndef LIBDIR
90	LIBDIR_PC := $$\{prefix\}/$(LIBSUBDIR)
91else
92	LIBDIR_PC := $(LIBDIR)
93endif
94PREFIX ?= /usr
95LIBDIR ?= $(PREFIX)/$(LIBSUBDIR)
96INCLUDEDIR ?= $(PREFIX)/include
97UAPIDIR ?= $(PREFIX)/include
98
99TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
100
101all: $(STATIC_LIBS) $(SHARED_LIBS) $(PC_FILE)
102
103$(OBJDIR)/libbpf.a: $(STATIC_OBJS)
104	$(call msg,AR,$@)
105	$(Q)$(AR) rcs $@ $^
106
107$(OBJDIR)/libbpf.so: $(OBJDIR)/libbpf.so.$(LIBBPF_MAJOR_VERSION)
108	$(Q)ln -sf $(^F) $@
109
110$(OBJDIR)/libbpf.so.$(LIBBPF_MAJOR_VERSION): $(OBJDIR)/libbpf.so.$(LIBBPF_VERSION)
111	$(Q)ln -sf $(^F) $@
112
113$(OBJDIR)/libbpf.so.$(LIBBPF_VERSION): $(SHARED_OBJS)
114	$(call msg,CC,$@)
115	$(Q)$(CC) -shared -Wl,--version-script=$(VERSION_SCRIPT) \
116		  -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
117		  $^ $(ALL_LDFLAGS) -o $@
118
119$(OBJDIR)/libbpf.pc: force
120	$(Q)sed -e "s|@PREFIX@|$(PREFIX)|" \
121		-e "s|@LIBDIR@|$(LIBDIR_PC)|" \
122		-e "s|@VERSION@|$(LIBBPF_VERSION)|" \
123		< libbpf.pc.template > $@
124
125$(STATIC_OBJDIR) $(SHARED_OBJDIR):
126	$(call msg,MKDIR,$@)
127	$(Q)mkdir -p $@
128
129$(STATIC_OBJDIR)/%.o: %.c | $(STATIC_OBJDIR)
130	$(call msg,CC,$@)
131	$(Q)$(CC) $(ALL_CFLAGS) $(CPPFLAGS) -c $< -o $@
132
133$(SHARED_OBJDIR)/%.o: %.c | $(SHARED_OBJDIR)
134	$(call msg,CC,$@)
135	$(Q)$(CC) $(ALL_CFLAGS) $(SHARED_CFLAGS) $(CPPFLAGS) -c $< -o $@
136
137define do_install
138	$(call msg,INSTALL,$1)
139	$(Q)if [ ! -d '$(DESTDIR)$2' ]; then		\
140		$(INSTALL) -d -m 755 '$(DESTDIR)$2';	\
141	fi;
142	$(Q)$(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR)$2'
143endef
144
145# Preserve symlinks at installation.
146define do_s_install
147	$(call msg,INSTALL,$1)
148	$(Q)if [ ! -d '$(DESTDIR)$2' ]; then		\
149		$(INSTALL) -d -m 755 '$(DESTDIR)$2';	\
150	fi;
151	$(Q)cp -fR $1 '$(DESTDIR)$2'
152endef
153
154install: all install_headers install_pkgconfig
155	$(call do_s_install,$(STATIC_LIBS) $(SHARED_LIBS),$(LIBDIR))
156
157install_headers:
158	$(call do_install,$(HEADERS),$(INCLUDEDIR)/bpf,644)
159
160# UAPI headers can be installed by a different package so they're not installed
161# in by install rule.
162install_uapi_headers:
163	$(call do_install,$(UAPI_HEADERS),$(UAPIDIR)/linux,644)
164
165install_pkgconfig: $(PC_FILE)
166	$(call do_install,$(PC_FILE),$(LIBDIR)/pkgconfig,644)
167
168clean:
169	$(call msg,CLEAN)
170	$(Q)rm -rf *.o *.a *.so *.so.* *.pc $(SHARED_OBJDIR) $(STATIC_OBJDIR)
171
172.PHONY: cscope tags force
173cscope:
174	$(call msg,CSCOPE)
175	$(Q)ls *.c *.h > cscope.files
176	$(Q)cscope -b -q -f cscope.out
177
178tags:
179	$(call msg,CTAGS)
180	$(Q)rm -f TAGS tags
181	$(Q)ls *.c *.h | xargs $(TAGS_PROG) -a
182
183force:
184