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 := $(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
52include $(srctree)/tools/scripts/Makefile.include
53
54# copy a bit from Linux kbuild
55
56ifeq ("$(origin V)", "command line")
57 VERBOSE = $(V)
58endif
59ifndef VERBOSE
60 VERBOSE = 0
61endif
62
63INCLUDES = -I$(or $(OUTPUT),.) \
64 -I$(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 += -std=gnu89
88override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
89override CFLAGS += -Werror -Wall
90override CFLAGS += $(INCLUDES)
91override CFLAGS += -fvisibility=hidden
92override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
93override CFLAGS += $(CLANG_CROSS_FLAGS)
94
95# flags specific for shared library
96SHLIB_FLAGS := -DSHARED -fPIC
97
98ifeq ($(VERBOSE),1)
99 Q =
100else
101 Q = @
102endif
103
104# Disable command line variables (CFLAGS) override from top
105# level Makefile (perf), otherwise build Makefile will get
106# the same command line setup.
107MAKEOVERRIDES=
108
109all:
110
111OUTPUT ?= ./
112OUTPUT := $(abspath $(OUTPUT))/
113export srctree OUTPUT CC LD CFLAGS V
114include $(srctree)/tools/build/Makefile.include
115
116SHARED_OBJDIR := $(OUTPUT)sharedobjs/
117STATIC_OBJDIR := $(OUTPUT)staticobjs/
118BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o
119BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o
120BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
121BPF_GENERATED := $(BPF_HELPER_DEFS)
122
123LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
124LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
125PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))
126
127TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
128
129GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \
130 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
131 sed 's/\[.*\]//' | \
132 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
133 sort -u | wc -l)
134VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
135 sed 's/\[.*\]//' | \
136 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
137 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
138
139CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
140
141all: fixdep
142 $(Q)$(MAKE) all_cmd
143
144all_cmd: $(CMD_TARGETS) check
145
146$(SHARED_OBJDIR) $(STATIC_OBJDIR):
147 $(Q)mkdir -p $@
148
149$(BPF_IN_SHARED): force $(BPF_GENERATED) | $(SHARED_OBJDIR)
150 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
151 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
152 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
153 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
154 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
155 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
156 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
157 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
158 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
159 $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(SHARED_OBJDIR) $(SHARED_OBJDIR)fixdep
160 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
161
162$(BPF_IN_STATIC): force $(BPF_GENERATED) | $(STATIC_OBJDIR)
163 $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(STATIC_OBJDIR) $(STATIC_OBJDIR)fixdep
164 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
165
166$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
167 $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \
168 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
169
170$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
171
172$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)
173 $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \
174 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
175 -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@
176 @ln -sf $(@F) $(OUTPUT)libbpf.so
177 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
178
179$(OUTPUT)libbpf.a: $(BPF_IN_STATIC)
180 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^
181
182$(OUTPUT)libbpf.pc:
183 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
184 -e "s|@LIBDIR@|$(libdir_SQ)|" \
185 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \
186 < libbpf.pc.template > $@
187
188check: check_abi check_version
189
190check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)
191 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
192 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \
193 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \
194 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
195 "Please make sure all LIBBPF_API symbols are" \
196 "versioned in $(VERSION_SCRIPT)." >&2; \
197 readelf -s --wide $(BPF_IN_SHARED) | \
198 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
199 sed 's/\[.*\]//' | \
200 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
201 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
202 readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
203 sed 's/\[.*\]//' | \
204 awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'| \
205 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
206 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
207 diff -u $(OUTPUT)libbpf_global_syms.tmp \
208 $(OUTPUT)libbpf_versioned_syms.tmp; \
209 rm $(OUTPUT)libbpf_global_syms.tmp \
210 $(OUTPUT)libbpf_versioned_syms.tmp; \
211 exit 1; \
212 fi
213
214HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
215HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
216
217check_version: $(VERSION_SCRIPT) libbpf_version.h
218 @if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then \
219 echo "Error: libbpf major version mismatch detected: " \
220 "'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2; \
221 exit 1; \
222 fi
223 @if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then \
224 echo "Error: libbpf minor version mismatch detected: " \
225 "'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \
226 exit 1; \
227 fi
228
229define do_install_mkdir
230 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
231 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
232 fi
233endef
234
235define do_install
236 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
237 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
238 fi; \
239 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
240endef
241
242install_lib: all_cmd
243 $(call QUIET_INSTALL, $(LIB_TARGET)) \
244 $(call do_install_mkdir,$(libdir_SQ)); \
245 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
246
247SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h \
248 bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h \
249 skel_internal.h libbpf_version.h usdt.bpf.h
250GEN_HDRS := $(BPF_GENERATED)
251
252INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf
253INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS))
254INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS)))
255
256$(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h
257 $(call QUIET_INSTALL, $@) \
258 $(call do_install,$<,$(prefix)/include/bpf,644)
259
260$(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h
261 $(call QUIET_INSTALL, $@) \
262 $(call do_install,$<,$(prefix)/include/bpf,644)
263
264install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS)
265 $(call QUIET_INSTALL, libbpf_headers)
266
267install_pkgconfig: $(PC_FILE)
268 $(call QUIET_INSTALL, $(PC_FILE)) \
269 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
270
271install: install_lib install_pkgconfig install_headers
272
273clean: fixdep-clean
274 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \
275 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED) \
276 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \
277 $(addprefix $(OUTPUT), \
278 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
279
280PHONY += force cscope tags check check_abi check_version
281force:
282
283cscope:
284 ls *.c *.h > cscope.files
285 cscope -b -q -I $(srctree)/include -f cscope.out
286
287tags:
288 $(RM) -f TAGS tags
289 ls *.c *.h | xargs $(TAGS_PROG) -a
290
291# Declare the contents of the .PHONY variable as phony. We keep that
292# information in a variable so we can use it in if_changed and friends.
293.PHONY: $(PHONY)
294
295# Delete partially updated (corrupted) files on error
296.DELETE_ON_ERROR:
297
298help:
299 @echo 'libbpf common targets:'
300 @echo ' HINT: use "V=1" to enable verbose build'
301 @echo ' all - build libraries and pkgconfig'
302 @echo ' clean - remove all generated files'
303 @echo ' check - check ABI and version info'
304 @echo ''
305 @echo 'libbpf install targets:'
306 @echo ' HINT: use "prefix"(defaults to "/usr/local") or "DESTDIR" (defaults to "/")'
307 @echo ' to adjust target destination, e.g. "make prefix=/usr/local install"'
308 @echo ' install - build and install all headers, libraries and pkgconfig'
309 @echo ' install_headers - install only headers to include/bpf'
310 @echo ''
311 @echo 'libbpf make targets:'
312 @echo ' tags - use ctags to make tag information for source code browsing'
313 @echo ' cscope - use cscope to make interactive source code browsing database'