Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 = $(abs_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
52include $(srctree)/tools/scripts/Makefile.include
53
54# copy a bit from Linux kbuild
55
56ifeq ("$(origin V)", "command line")
57 VERBOSE = $(V)
58endif
59ifndef VERBOSE
60 VERBOSE = 0
61endif
62
63INCLUDES = -I$(if $(OUTPUT),$(OUTPUT),.) \
64 -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi
65
66export prefix libdir src obj
67
68# Shell quotes
69libdir_SQ = $(subst ','\'',$(libdir))
70libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
71
72OBJ = $@
73N =
74
75LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)
76LIB_FILE = libbpf.a libbpf.so*
77PC_FILE = libbpf.pc
78
79# Set compile option CFLAGS
80ifdef EXTRA_CFLAGS
81 CFLAGS := $(EXTRA_CFLAGS)
82else
83 CFLAGS := -g -O2
84endif
85
86# Append required CFLAGS
87override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
88override CFLAGS += -Werror -Wall
89override CFLAGS += $(INCLUDES)
90override CFLAGS += -fvisibility=hidden
91override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
92
93# flags specific for shared library
94SHLIB_FLAGS := -DSHARED -fPIC
95
96ifeq ($(VERBOSE),1)
97 Q =
98else
99 Q = @
100endif
101
102# Disable command line variables (CFLAGS) override from top
103# level Makefile (perf), otherwise build Makefile will get
104# the same command line setup.
105MAKEOVERRIDES=
106
107all:
108
109export srctree OUTPUT CC LD CFLAGS V
110include $(srctree)/tools/build/Makefile.include
111
112SHARED_OBJDIR := $(OUTPUT)sharedobjs/
113STATIC_OBJDIR := $(OUTPUT)staticobjs/
114BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o
115BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o
116BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
117BPF_GENERATED := $(BPF_HELPER_DEFS)
118
119LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
120LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
121PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))
122
123TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
124
125GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \
126 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
127 sed 's/\[.*\]//' | \
128 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \
129 sort -u | wc -l)
130VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
131 sed 's/\[.*\]//' | \
132 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \
133 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
134
135CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
136
137all: fixdep
138 $(Q)$(MAKE) all_cmd
139
140all_cmd: $(CMD_TARGETS) check
141
142$(BPF_IN_SHARED): force $(BPF_GENERATED)
143 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
144 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
145 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
146 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
147 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
148 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
149 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
150 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
151 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
152 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
153
154$(BPF_IN_STATIC): force $(BPF_GENERATED)
155 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
156
157$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
158 $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \
159 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
160
161$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
162
163$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)
164 $(QUIET_LINK)$(CC) $(LDFLAGS) \
165 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
166 -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@
167 @ln -sf $(@F) $(OUTPUT)libbpf.so
168 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
169
170$(OUTPUT)libbpf.a: $(BPF_IN_STATIC)
171 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^
172
173$(OUTPUT)libbpf.pc:
174 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
175 -e "s|@LIBDIR@|$(libdir_SQ)|" \
176 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \
177 < libbpf.pc.template > $@
178
179check: check_abi check_version
180
181check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)
182 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
183 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \
184 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \
185 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
186 "Please make sure all LIBBPF_API symbols are" \
187 "versioned in $(VERSION_SCRIPT)." >&2; \
188 readelf -s --wide $(BPF_IN_SHARED) | \
189 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
190 sed 's/\[.*\]//' | \
191 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
192 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
193 readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
194 sed 's/\[.*\]//' | \
195 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
196 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
197 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
198 diff -u $(OUTPUT)libbpf_global_syms.tmp \
199 $(OUTPUT)libbpf_versioned_syms.tmp; \
200 rm $(OUTPUT)libbpf_global_syms.tmp \
201 $(OUTPUT)libbpf_versioned_syms.tmp; \
202 exit 1; \
203 fi
204
205HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
206HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
207
208check_version: $(VERSION_SCRIPT) libbpf_version.h
209 @if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then \
210 echo "Error: libbpf major version mismatch detected: " \
211 "'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2; \
212 exit 1; \
213 fi
214 @if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then \
215 echo "Error: libbpf minor version mismatch detected: " \
216 "'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \
217 exit 1; \
218 fi
219
220define do_install_mkdir
221 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
222 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
223 fi
224endef
225
226define do_install
227 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
228 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
229 fi; \
230 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
231endef
232
233install_lib: all_cmd
234 $(call QUIET_INSTALL, $(LIB_TARGET)) \
235 $(call do_install_mkdir,$(libdir_SQ)); \
236 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
237
238SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h xsk.h \
239 bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h \
240 skel_internal.h libbpf_version.h
241GEN_HDRS := $(BPF_GENERATED)
242
243INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf
244INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS))
245INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS)))
246
247$(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h
248 $(call QUIET_INSTALL, $@) \
249 $(call do_install,$<,$(prefix)/include/bpf,644)
250
251$(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h
252 $(call QUIET_INSTALL, $@) \
253 $(call do_install,$<,$(prefix)/include/bpf,644)
254
255install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS)
256
257install_pkgconfig: $(PC_FILE)
258 $(call QUIET_INSTALL, $(PC_FILE)) \
259 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
260
261install: install_lib install_pkgconfig install_headers
262
263clean:
264 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \
265 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED) \
266 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \
267 $(addprefix $(OUTPUT), \
268 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
269
270PHONY += force cscope tags check check_abi check_version
271force:
272
273cscope:
274 ls *.c *.h > cscope.files
275 cscope -b -q -I $(srctree)/include -f cscope.out
276
277tags:
278 $(RM) -f TAGS tags
279 ls *.c *.h | xargs $(TAGS_PROG) -a
280
281# Declare the contents of the .PHONY variable as phony. We keep that
282# information in a variable so we can use it in if_changed and friends.
283.PHONY: $(PHONY)
284
285# Delete partially updated (corrupted) files on error
286.DELETE_ON_ERROR: