1# SPDX-License-Identifier: GPL-2.0-only
2include ../../scripts/Makefile.include
3include ../../scripts/Makefile.arch
4
5srctree := $(abspath $(CURDIR)/../../../)
6
7ifeq ($(V),1)
8  Q =
9  msg =
10else
11  Q = @
12  ifeq ($(silent),1)
13    msg =
14  else
15    msg = @printf '  %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
16  endif
17  MAKEFLAGS=--no-print-directory
18endif
19
20# always use the host compiler
21HOST_OVERRIDES := AR="$(HOSTAR)" CC="$(HOSTCC)" LD="$(HOSTLD)" ARCH="$(HOSTARCH)" \
22		  EXTRA_CFLAGS="$(HOSTCFLAGS) $(KBUILD_HOSTCFLAGS)"
23
24RM      ?= rm
25CROSS_COMPILE =
26
27OUTPUT ?= $(srctree)/tools/bpf/resolve_btfids/
28
29LIBBPF_SRC := $(srctree)/tools/lib/bpf/
30SUBCMD_SRC := $(srctree)/tools/lib/subcmd/
31
32BPFOBJ     := $(OUTPUT)/libbpf/libbpf.a
33LIBBPF_OUT := $(abspath $(dir $(BPFOBJ)))/
34SUBCMDOBJ  := $(OUTPUT)/libsubcmd/libsubcmd.a
35SUBCMD_OUT := $(abspath $(dir $(SUBCMDOBJ)))/
36
37LIBBPF_DESTDIR := $(LIBBPF_OUT)
38LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)include
39
40SUBCMD_DESTDIR := $(SUBCMD_OUT)
41SUBCMD_INCLUDE := $(SUBCMD_DESTDIR)include
42
43BINARY     := $(OUTPUT)/resolve_btfids
44BINARY_IN  := $(BINARY)-in.o
45
46all: $(BINARY)
47
48prepare: $(BPFOBJ) $(SUBCMDOBJ)
49
50$(OUTPUT) $(OUTPUT)/libsubcmd $(LIBBPF_OUT):
51	$(call msg,MKDIR,,$@)
52	$(Q)mkdir -p $(@)
53
54$(SUBCMDOBJ): fixdep FORCE | $(OUTPUT)/libsubcmd
55	$(Q)$(MAKE) -C $(SUBCMD_SRC) OUTPUT=$(SUBCMD_OUT) \
56		    DESTDIR=$(SUBCMD_DESTDIR) $(HOST_OVERRIDES) prefix= subdir= \
57		    $(abspath $@) install_headers
58
59$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUT)
60	$(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) OUTPUT=$(LIBBPF_OUT)    \
61		    DESTDIR=$(LIBBPF_DESTDIR) $(HOST_OVERRIDES) prefix= subdir= \
62		    $(abspath $@) install_headers
63
64LIBELF_FLAGS := $(shell $(HOSTPKG_CONFIG) libelf --cflags 2>/dev/null)
65LIBELF_LIBS  := $(shell $(HOSTPKG_CONFIG) libelf --libs 2>/dev/null || echo -lelf)
66
67CFLAGS += -g \
68          -I$(srctree)/tools/include \
69          -I$(srctree)/tools/include/uapi \
70          -I$(LIBBPF_INCLUDE) \
71          -I$(SUBCMD_INCLUDE) \
72          $(LIBELF_FLAGS)
73
74LIBS = $(LIBELF_LIBS) -lz
75
76export srctree OUTPUT CFLAGS Q
77include $(srctree)/tools/build/Makefile.include
78
79$(BINARY_IN): fixdep FORCE prepare | $(OUTPUT)
80	$(Q)$(MAKE) $(build)=resolve_btfids $(HOST_OVERRIDES)
81
82$(BINARY): $(BPFOBJ) $(SUBCMDOBJ) $(BINARY_IN)
83	$(call msg,LINK,$@)
84	$(Q)$(HOSTCC) $(BINARY_IN) $(KBUILD_HOSTLDFLAGS) -o $@ $(BPFOBJ) $(SUBCMDOBJ) $(LIBS)
85
86clean_objects := $(wildcard $(OUTPUT)/*.o                \
87                            $(OUTPUT)/.*.o.cmd           \
88                            $(OUTPUT)/.*.o.d             \
89                            $(LIBBPF_OUT)                \
90                            $(LIBBPF_DESTDIR)            \
91                            $(SUBCMD_OUT)                \
92                            $(SUBCMD_DESTDIR)            \
93                            $(OUTPUT)/resolve_btfids)
94
95ifneq ($(clean_objects),)
96clean: fixdep-clean
97	$(call msg,CLEAN,$(BINARY))
98	$(Q)$(RM) -rf $(clean_objects)
99else
100clean:
101endif
102
103tags:
104	$(call msg,GEN,,tags)
105	$(Q)ctags -R . $(LIBBPF_SRC) $(SUBCMD_SRC)
106
107FORCE:
108
109.PHONY: all FORCE clean tags prepare
110