xref: /openbmc/linux/tools/lib/bpf/Makefile (revision fe7498ef) 
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:
287