xref: /openbmc/linux/tools/lib/bpf/Makefile (revision da2ef666) 
1# SPDX-License-Identifier: GPL-2.0
2# Most of this file is copied from tools/lib/traceevent/Makefile
3
4BPF_VERSION = 0
5BPF_PATCHLEVEL = 0
6BPF_EXTRAVERSION = 1
7
8MAKEFLAGS += --no-print-directory
9
10ifeq ($(srctree),)
11srctree := $(patsubst %/,%,$(dir $(CURDIR)))
12srctree := $(patsubst %/,%,$(dir $(srctree)))
13srctree := $(patsubst %/,%,$(dir $(srctree)))
14#$(info Determined 'srctree' to be $(srctree))
15endif
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.
22define allow-override
23  $(if $(or $(findstring environment,$(origin $(1))),\
24            $(findstring command line,$(origin $(1)))),,\
25    $(eval $(1) = $(2)))
26endef
27
28# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
29$(call allow-override,CC,$(CROSS_COMPILE)gcc)
30$(call allow-override,AR,$(CROSS_COMPILE)ar)
31
32INSTALL = install
33
34# Use DESTDIR for installing into a different root directory.
35# This is useful for building a package. The program will be
36# installed in this directory as if it was the root directory.
37# Then the build tool can move it later.
38DESTDIR ?=
39DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
40
41include $(srctree)/tools/scripts/Makefile.arch
42
43ifeq ($(LP64), 1)
44  libdir_relative = lib64
45else
46  libdir_relative = lib
47endif
48
49prefix ?= /usr/local
50libdir = $(prefix)/$(libdir_relative)
51man_dir = $(prefix)/share/man
52man_dir_SQ = '$(subst ','\'',$(man_dir))'
53
54export man_dir man_dir_SQ INSTALL
55export DESTDIR DESTDIR_SQ
56
57include ../../scripts/Makefile.include
58
59# copy a bit from Linux kbuild
60
61ifeq ("$(origin V)", "command line")
62  VERBOSE = $(V)
63endif
64ifndef VERBOSE
65  VERBOSE = 0
66endif
67
68FEATURE_USER = .libbpf
69FEATURE_TESTS = libelf libelf-mmap bpf reallocarray
70FEATURE_DISPLAY = libelf bpf
71
72INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi -I$(srctree)/tools/perf
73FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
74
75check_feat := 1
76NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
77ifdef MAKECMDGOALS
78ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
79  check_feat := 0
80endif
81endif
82
83ifeq ($(check_feat),1)
84ifeq ($(FEATURES_DUMP),)
85include $(srctree)/tools/build/Makefile.feature
86else
87include $(FEATURES_DUMP)
88endif
89endif
90
91export prefix libdir src obj
92
93# Shell quotes
94libdir_SQ = $(subst ','\'',$(libdir))
95libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
96
97LIB_FILE = libbpf.a libbpf.so
98
99VERSION		= $(BPF_VERSION)
100PATCHLEVEL	= $(BPF_PATCHLEVEL)
101EXTRAVERSION	= $(BPF_EXTRAVERSION)
102
103OBJ		= $@
104N		=
105
106LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
107
108# Set compile option CFLAGS
109ifdef EXTRA_CFLAGS
110  CFLAGS := $(EXTRA_CFLAGS)
111else
112  CFLAGS := -g -Wall
113endif
114
115ifeq ($(feature-libelf-mmap), 1)
116  override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
117endif
118
119ifeq ($(feature-reallocarray), 0)
120  override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
121endif
122
123# Append required CFLAGS
124override CFLAGS += $(EXTRA_WARNINGS)
125override CFLAGS += -Werror -Wall
126override CFLAGS += -fPIC
127override CFLAGS += $(INCLUDES)
128
129ifeq ($(VERBOSE),1)
130  Q =
131else
132  Q = @
133endif
134
135# Disable command line variables (CFLAGS) override from top
136# level Makefile (perf), otherwise build Makefile will get
137# the same command line setup.
138MAKEOVERRIDES=
139
140all:
141
142export srctree OUTPUT CC LD CFLAGS V
143include $(srctree)/tools/build/Makefile.include
144
145BPF_IN    := $(OUTPUT)libbpf-in.o
146LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
147
148CMD_TARGETS = $(LIB_FILE)
149
150TARGETS = $(CMD_TARGETS)
151
152all: fixdep all_cmd
153
154all_cmd: $(CMD_TARGETS)
155
156$(BPF_IN): force elfdep bpfdep
157	@(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
158	(diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
159	echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
160	@(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
161	(diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
162	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
163	@(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
164	(diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
165	echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
166	@(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
167	(diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
168	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
169	$(Q)$(MAKE) $(build)=libbpf
170
171$(OUTPUT)libbpf.so: $(BPF_IN)
172	$(QUIET_LINK)$(CC) --shared $^ -o $@
173
174$(OUTPUT)libbpf.a: $(BPF_IN)
175	$(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
176
177define do_install
178	if [ ! -d '$(DESTDIR_SQ)$2' ]; then		\
179		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2';	\
180	fi;						\
181	$(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
182endef
183
184install_lib: all_cmd
185	$(call QUIET_INSTALL, $(LIB_FILE)) \
186		$(call do_install,$(LIB_FILE),$(libdir_SQ))
187
188install_headers:
189	$(call QUIET_INSTALL, headers) \
190		$(call do_install,bpf.h,$(prefix)/include/bpf,644); \
191		$(call do_install,libbpf.h,$(prefix)/include/bpf,644);
192		$(call do_install,btf.h,$(prefix)/include/bpf,644);
193
194install: install_lib
195
196### Cleaning rules
197
198config-clean:
199	$(call QUIET_CLEAN, config)
200	$(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
201
202clean:
203	$(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so .*.d .*.cmd \
204		$(RM) LIBBPF-CFLAGS
205	$(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
206
207
208
209PHONY += force elfdep bpfdep
210force:
211
212elfdep:
213	@if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
214
215bpfdep:
216	@if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
217
218# Declare the contents of the .PHONY variable as phony.  We keep that
219# information in a variable so we can use it in if_changed and friends.
220.PHONY: $(PHONY)
221