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1 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2 # Most of this file is copied from tools/lib/traceevent/Makefile
3
4 BPF_VERSION = 0
5 BPF_PATCHLEVEL = 0
6 BPF_EXTRAVERSION = 1
7
8 MAKEFLAGS += --no-print-directory
9
10 ifeq ($(srctree),)
11 srctree := $(patsubst %/,%,$(dir $(CURDIR)))
12 srctree := $(patsubst %/,%,$(dir $(srctree)))
13 srctree := $(patsubst %/,%,$(dir $(srctree)))
14 #$(info Determined 'srctree' to be $(srctree))
15 endif
16
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.
22 define allow-override
23   $(if $(or $(findstring environment,$(origin $(1))),\
24             $(findstring command line,$(origin $(1)))),,\
25     $(eval $(1) = $(2)))
26 endef
27
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)
31
32 INSTALL = install
33
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.
38 DESTDIR ?=
39 DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
40
41 include $(srctree)/tools/scripts/Makefile.arch
42
43 ifeq ($(LP64), 1)
44   libdir_relative = lib64
45 else
46   libdir_relative = lib
47 endif
48
49 prefix ?= /usr/local
50 libdir = $(prefix)/$(libdir_relative)
51 man_dir = $(prefix)/share/man
52 man_dir_SQ = '$(subst ','\'',$(man_dir))'
53
54 export man_dir man_dir_SQ INSTALL
55 export DESTDIR DESTDIR_SQ
56
57 include ../../scripts/Makefile.include
58
59 # copy a bit from Linux kbuild
60
61 ifeq ("$(origin V)", "command line")
62   VERBOSE = $(V)
63 endif
64 ifndef VERBOSE
65   VERBOSE = 0
66 endif
67
68 FEATURE_USER = .libbpf
69 FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx
70 FEATURE_DISPLAY = libelf bpf
71
72 INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
73 FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
74
75 check_feat := 1
76 NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
77 ifdef MAKECMDGOALS
78 ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
79   check_feat := 0
80 endif
81 endif
82
83 ifeq ($(check_feat),1)
84 ifeq ($(FEATURES_DUMP),)
85 include $(srctree)/tools/build/Makefile.feature
86 else
87 include $(FEATURES_DUMP)
88 endif
89 endif
90
91 export prefix libdir src obj
92
93 # Shell quotes
94 libdir_SQ = $(subst ','\'',$(libdir))
95 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
96
97 LIB_FILE = libbpf.a libbpf.so
98
99 VERSION         = $(BPF_VERSION)
100 PATCHLEVEL      = $(BPF_PATCHLEVEL)
101 EXTRAVERSION    = $(BPF_EXTRAVERSION)
102
103 OBJ             = $@
104 N               =
105
106 LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
107
108 # Set compile option CFLAGS
109 ifdef EXTRA_CFLAGS
110   CFLAGS := $(EXTRA_CFLAGS)
111 else
112   CFLAGS := -g -Wall
113 endif
114
115 ifeq ($(feature-libelf-mmap), 1)
116   override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
117 endif
118
119 ifeq ($(feature-reallocarray), 0)
120   override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
121 endif
122
123 # Append required CFLAGS
124 override CFLAGS += $(EXTRA_WARNINGS)
125 override CFLAGS += -Werror -Wall
126 override CFLAGS += -fPIC
127 override CFLAGS += $(INCLUDES)
128 override CFLAGS += -fvisibility=hidden
129
130 ifeq ($(VERBOSE),1)
131   Q =
132 else
133   Q = @
134 endif
135
136 # Disable command line variables (CFLAGS) override from top
137 # level Makefile (perf), otherwise build Makefile will get
138 # the same command line setup.
139 MAKEOVERRIDES=
140
141 all:
142
143 export srctree OUTPUT CC LD CFLAGS V
144 include $(srctree)/tools/build/Makefile.include
145
146 BPF_IN    := $(OUTPUT)libbpf-in.o
147 LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
148 VERSION_SCRIPT := libbpf.map
149
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)
154
155 CMD_TARGETS = $(LIB_FILE)
156
157 CXX_TEST_TARGET = $(OUTPUT)test_libbpf
158
159 ifeq ($(feature-cxx), 1)
160         CMD_TARGETS += $(CXX_TEST_TARGET)
161 endif
162
163 TARGETS = $(CMD_TARGETS)
164
165 all: fixdep all_cmd
166
167 all_cmd: $(CMD_TARGETS) check
168
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
183
184 $(OUTPUT)libbpf.so: $(BPF_IN)
185         $(QUIET_LINK)$(CC) --shared -Wl,--version-script=$(VERSION_SCRIPT) \
186                 $^ -o $@
187
188 $(OUTPUT)libbpf.a: $(BPF_IN)
189         $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
190
191 $(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a
192         $(QUIET_LINK)$(CXX) $^ -lelf -o $@
193
194 check: check_abi
195
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 $(VERSION_SCRIPT)." >&2;              \
203                 exit 1;                                                  \
204         fi
205
206 define do_install
207         if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
208                 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
209         fi;                                             \
210         $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
211 endef
212
213 install_lib: all_cmd
214         $(call QUIET_INSTALL, $(LIB_FILE)) \
215                 $(call do_install,$(LIB_FILE),$(libdir_SQ))
216
217 install_headers:
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);
222
223 install: install_lib
224
225 ### Cleaning rules
226
227 config-clean:
228         $(call QUIET_CLEAN, config)
229         $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
230
231 clean:
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) $(OUTPUT)FEATURE-DUMP.libbpf
235
236
237
238 PHONY += force elfdep bpfdep
239 force:
240
241 elfdep:
242         @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
243
244 bpfdep:
245         @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
246
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.
249 .PHONY: $(PHONY)
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