projects/linux·blob master · refs

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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
4RM ?= rm
5srctree := $(realpath $(srctree))
6
7VERSION_SCRIPT := libbpf.map
8LIBBPF_VERSION := $(shell \
9 grep -oE '^LIBBPF_([0-9.]+)' $(VERSION_SCRIPT) | \
10 sort -rV | head -n1 | cut -d'_' -f2)
11LIBBPF_MAJOR_VERSION := $(word 1,$(subst ., ,$(LIBBPF_VERSION)))
12LIBBPF_MINOR_VERSION := $(word 2,$(subst ., ,$(LIBBPF_VERSION)))
13
14MAKEFLAGS += --no-print-directory
15
16# This will work when bpf is built in tools env. where srctree
17# isn't set and when invoked from selftests build, where srctree
18# is a ".". building_out_of_srctree is undefined for in srctree
19# builds
20ifndef building_out_of_srctree
21srctree := $(patsubst %/,%,$(dir $(CURDIR)))
22srctree := $(patsubst %/,%,$(dir $(srctree)))
23srctree := $(patsubst %/,%,$(dir $(srctree)))
24#$(info Determined 'srctree' to be $(srctree))
25endif
26
27INSTALL = install
28
29# Use DESTDIR for installing into a different root directory.
30# This is useful for building a package. The program will be
31# installed in this directory as if it was the root directory.
32# Then the build tool can move it later.
33DESTDIR ?=
34DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
35
36include $(srctree)/tools/scripts/Makefile.arch
37
38ifeq ($(LP64), 1)
39 libdir_relative = lib64
40else
41 libdir_relative = lib
42endif
43
44prefix ?= /usr/local
45libdir = $(prefix)/$(libdir_relative)
46man_dir = $(prefix)/share/man
47man_dir_SQ = '$(subst ','\'',$(man_dir))'
48
49export man_dir man_dir_SQ INSTALL
50export DESTDIR DESTDIR_SQ
51
52# Defer assigning EXTRA_CFLAGS to CFLAGS until after including
53# tools/scripts/Makefile.include, as it may add flags to EXTRA_CFLAGS.
54ifdef EXTRA_CFLAGS
55 CFLAGS :=
56else
57 CFLAGS := -g -O2
58endif
59
60include $(srctree)/tools/scripts/Makefile.include
61
62# copy a bit from Linux kbuild
63
64INCLUDES = -I$(or $(OUTPUT),.) \
65 -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi \
66 -I$(srctree)/tools/arch/$(SRCARCH)/include
67
68export prefix libdir src obj
69
70# Shell quotes
71libdir_SQ = $(subst ','\'',$(libdir))
72libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
73
74OBJ = $@
75N =
76
77LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)
78LIB_FILE = libbpf.a libbpf.so*
79PC_FILE = libbpf.pc
80
81# Append required CFLAGS
82override CFLAGS += -std=gnu89
83override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
84override CFLAGS += -Werror -Wall
85override CFLAGS += $(INCLUDES)
86override CFLAGS += -fvisibility=hidden
87override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
88override CFLAGS += $(EXTRA_CFLAGS)
89
90# flags specific for shared library
91SHLIB_FLAGS := -DSHARED -fPIC
92
93# Disable command line variables (CFLAGS) override from top
94# level Makefile (perf), otherwise build Makefile will get
95# the same command line setup.
96MAKEOVERRIDES=
97
98all:
99
100OUTPUT ?= ./
101OUTPUT := $(abspath $(OUTPUT))/
102export srctree OUTPUT CC LD CFLAGS V
103include $(srctree)/tools/build/Makefile.include
104
105SHARED_OBJDIR := $(OUTPUT)sharedobjs/
106STATIC_OBJDIR := $(OUTPUT)staticobjs/
107BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o
108BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o
109BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
110BPF_GENERATED := $(BPF_HELPER_DEFS)
111
112LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
113LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
114PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))
115
116TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
117
118GLOBAL_SYM_COUNT = $(shell $(HOSTREADELF) -s --wide $(BPF_IN_SHARED) | \
119 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
120 sed 's/\[.*\]//' | \
121 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
122 sort -u | wc -l)
123VERSIONED_SYM_COUNT = $(shell $(HOSTREADELF) --dyn-syms --wide $(OUTPUT)libbpf.so | \
124 sed 's/\[.*\]//' | \
125 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
126 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
127
128CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
129
130all: fixdep
131 $(Q)$(MAKE) all_cmd
132
133all_cmd: $(CMD_TARGETS) check
134
135$(SHARED_OBJDIR) $(STATIC_OBJDIR):
136 $(Q)mkdir -p $@
137
138$(BPF_IN_SHARED): force $(BPF_GENERATED) | $(SHARED_OBJDIR)
139 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
140 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
141 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
142 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
143 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
144 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
145 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
146 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
147 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
148 $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(SHARED_OBJDIR) $(SHARED_OBJDIR)fixdep
149 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
150
151$(BPF_IN_STATIC): force $(BPF_GENERATED) | $(STATIC_OBJDIR)
152 $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(STATIC_OBJDIR) $(STATIC_OBJDIR)fixdep
153 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
154
155$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
156 $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \
157 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
158
159$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
160
161$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)
162 $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \
163 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
164 -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@
165 @ln -sf $(@F) $(OUTPUT)libbpf.so
166 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
167
168$(OUTPUT)libbpf.a: $(BPF_IN_STATIC)
169 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^
170
171$(OUTPUT)libbpf.pc:
172 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
173 -e "s|@LIBDIR@|$(libdir_SQ)|" \
174 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \
175 < libbpf.pc.template > $@
176
177check: check_abi check_version
178
179check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)
180 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
181 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \
182 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \
183 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
184 "Please make sure all LIBBPF_API symbols are" \
185 "versioned in $(VERSION_SCRIPT)." >&2; \
186 $(HOSTREADELF) -s --wide $(BPF_IN_SHARED) | \
187 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
188 sed 's/\[.*\]//' | \
189 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
190 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
191 $(HOSTREADELF) --dyn-syms --wide $(OUTPUT)libbpf.so | \
192 sed 's/\[.*\]//' | \
193 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'| \
194 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
195 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
196 diff -u $(OUTPUT)libbpf_global_syms.tmp \
197 $(OUTPUT)libbpf_versioned_syms.tmp; \
198 rm $(OUTPUT)libbpf_global_syms.tmp \
199 $(OUTPUT)libbpf_versioned_syms.tmp; \
200 exit 1; \
201 fi
202
203HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
204HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
205
206check_version: $(VERSION_SCRIPT) libbpf_version.h
207 @if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then \
208 echo "Error: libbpf major version mismatch detected: " \
209 "'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2; \
210 exit 1; \
211 fi
212 @if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then \
213 echo "Error: libbpf minor version mismatch detected: " \
214 "'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \
215 exit 1; \
216 fi
217
218define do_install_mkdir
219 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
220 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
221 fi
222endef
223
224define do_install
225 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
226 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
227 fi; \
228 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
229endef
230
231install_lib: all_cmd
232 $(call QUIET_INSTALL, $(LIB_TARGET)) \
233 $(call do_install_mkdir,$(libdir_SQ)); \
234 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
235
236SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h \
237 bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h \
238 skel_internal.h libbpf_version.h usdt.bpf.h
239GEN_HDRS := $(BPF_GENERATED)
240
241INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf
242INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS))
243INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS)))
244
245$(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h
246 $(call QUIET_INSTALL, $@) \
247 $(call do_install,$<,$(prefix)/include/bpf,644)
248
249$(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h
250 $(call QUIET_INSTALL, $@) \
251 $(call do_install,$<,$(prefix)/include/bpf,644)
252
253install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS)
254 $(call QUIET_INSTALL, libbpf_headers)
255
256install_pkgconfig: $(PC_FILE)
257 $(call QUIET_INSTALL, $(PC_FILE)) \
258 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
259
260install: install_lib install_pkgconfig install_headers
261
262clean: fixdep-clean
263 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \
264 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED) \
265 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \
266 $(addprefix $(OUTPUT), \
267 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
268
269PHONY += force cscope tags check check_abi check_version
270force:
271
272cscope:
273 ls *.c *.h > cscope.files
274 cscope -b -q -I $(srctree)/include -f cscope.out
275
276tags:
277 $(RM) -f TAGS tags
278 ls *.c *.h | xargs $(TAGS_PROG) -a
279
280# Declare the contents of the .PHONY variable as phony. We keep that
281# information in a variable so we can use it in if_changed and friends.
282.PHONY: $(PHONY)
283
284# Delete partially updated (corrupted) files on error
285.DELETE_ON_ERROR:
286
287help:
288 @echo 'libbpf common targets:'
289 @echo ' HINT: use "V=1" to enable verbose build'
290 @echo ' all - build libraries and pkgconfig'
291 @echo ' clean - remove all generated files'
292 @echo ' check - check ABI and version info'
293 @echo ''
294 @echo 'libbpf install targets:'
295 @echo ' HINT: use "prefix"(defaults to "/usr/local") or "DESTDIR" (defaults to "/")'
296 @echo ' to adjust target destination, e.g. "make prefix=/usr/local install"'
297 @echo ' install - build and install all headers, libraries and pkgconfig'
298 @echo ' install_headers - install only headers to include/bpf'
299 @echo ''
300 @echo 'libbpf make targets:'
301 @echo ' tags - use ctags to make tag information for source code browsing'
302 @echo ' cscope - use cscope to make interactive source code browsing database'