1 # SPDX-License-Identifier: GPL-2.0
2 ###
3 # Main build makefile.
4 #
5 # Lots of this code have been borrowed or hea
6 # of kbuild code, which is not credited, but
7 #
8 # Copyright (C) Sam Ravnborg <sam@mars.ravnbor
9 # Copyright (C) Linus Torvalds <torvalds@linux
10 #
11
12 PHONY := __build
13 __build:
14
15 ifeq ($(V),1)
16 quiet =
17 Q =
18 else
19 quiet=quiet_
20 Q=@
21 endif
22
23 # If the user is running make -s (silent mode)
24 # make-4.0 (and later) keep single letter opti
25 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
26 short-opts := $(firstword -$(MAKEFLAGS))
27 else
28 short-opts := $(filter-out --%,$(MAKEFLAGS))
29 endif
30
31 ifneq ($(findstring s,$(short-opts)),)
32 quiet=silent_
33 endif
34
35 build-dir := $(srctree)/tools/build
36
37 # Define $(fixdep) for dep-cmd function
38 ifeq ($(OUTPUT),)
39 fixdep := $(build-dir)/fixdep
40 else
41 fixdep := $(OUTPUT)/fixdep
42 endif
43
44 # Generic definitions
45 include $(build-dir)/Build.include
46
47 # do not force detected configuration
48 -include $(OUTPUT).config-detected
49
50 # Init all relevant variables used in build fi
51 # 1) they have correct type
52 # 2) they do not inherit any value from the en
53 subdir-y :=
54 obj-y :=
55 subdir-y :=
56 subdir-obj-y :=
57
58 # Build definitions
59 build-file := $(dir)/Build
60 -include $(build-file)
61
62 quiet_cmd_flex = FLEX $@
63 quiet_cmd_bison = BISON $@
64 quiet_cmd_test = TEST $@
65
66 # Create directory unless it exists
67 quiet_cmd_mkdir = MKDIR $(dir $@)
68 cmd_mkdir = mkdir -p $(dir $@)
69 rule_mkdir = $(if $(wildcard $(dir $@)),,
70
71 # Compile command
72 quiet_cmd_cc_o_c = CC $@
73 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $
74
75 quiet_cmd_host_cc_o_c = HOSTCC $@
76 cmd_host_cc_o_c = $(HOSTCC) $(host_c_fla
77
78 quiet_cmd_cxx_o_c = CXX $@
79 cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o
80
81 quiet_cmd_cpp_i_c = CPP $@
82 cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@
83
84 quiet_cmd_cc_s_c = AS $@
85 cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $
86
87 quiet_cmd_gen = GEN $@
88
89 # Link agregate command
90 # If there's nothing to link, create empty $@
91 quiet_cmd_ld_multi = LD $@
92 cmd_ld_multi = $(if $(strip $(obj-y)),\
93 $(LD) -r -o $@ $(filter
94
95 quiet_cmd_host_ld_multi = HOSTLD $@
96 cmd_host_ld_multi = $(if $(strip $(obj-y
97 $(HOSTLD) -r -o $@
98
99 ifneq ($(filter $(obj),$(hostprogs)),)
100 host = host_
101 endif
102
103 # Build rules
104 $(OUTPUT)%.o: %.c FORCE
105 $(call rule_mkdir)
106 $(call if_changed_dep,$(host)cc_o_c)
107
108 $(OUTPUT)%.o: %.cpp FORCE
109 $(call rule_mkdir)
110 $(call if_changed_dep,cxx_o_c)
111
112 $(OUTPUT)%.o: %.S FORCE
113 $(call rule_mkdir)
114 $(call if_changed_dep,$(host)cc_o_c)
115
116 $(OUTPUT)%.i: %.c FORCE
117 $(call rule_mkdir)
118 $(call if_changed_dep,cpp_i_c)
119
120 $(OUTPUT)%.s: %.S FORCE
121 $(call rule_mkdir)
122 $(call if_changed_dep,cpp_i_c)
123
124 $(OUTPUT)%.s: %.c FORCE
125 $(call rule_mkdir)
126 $(call if_changed_dep,cc_s_c)
127
128 # bison and flex files are generated in the OU
129 # so it needs a separate rule to depend on the
130 $(OUTPUT)%-bison.o: $(OUTPUT)%-bison.c FORCE
131 $(call rule_mkdir)
132 $(call if_changed_dep,$(host)cc_o_c)
133
134 $(OUTPUT)%-flex.o: $(OUTPUT)%-flex.c FORCE
135 $(call rule_mkdir)
136 $(call if_changed_dep,$(host)cc_o_c)
137
138 # Gather build data:
139 # obj-y - list of build objects
140 # subdir-y - list of directories to nest
141 # subdir-obj-y - list of directories objects
142 obj-y := $($(obj)-y)
143 subdir-y := $(patsubst %/,%,$(filter %/, $
144 obj-y := $(patsubst %/, %/$(obj)-in.o,
145 subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-
146
147 # '$(OUTPUT)/dir' prefix to all objects
148 objprefix := $(subst ./,,$(OUTPUT)$(dir)/)
149 obj-y := $(addprefix $(objprefix),$(obj
150 subdir-obj-y := $(addprefix $(objprefix),$(sub
151
152 # Final '$(obj)-in.o' object
153 in-target := $(objprefix)$(obj)-in.o
154
155 PHONY += $(subdir-y)
156
157 $(subdir-y):
158 $(Q)$(MAKE) -f $(build-dir)/Makefile.b
159
160 $(sort $(subdir-obj-y)): $(subdir-y) ;
161
162 $(in-target): $(obj-y) FORCE
163 $(call rule_mkdir)
164 $(call if_changed,$(host)ld_multi)
165
166 __build: $(in-target)
167 @:
168
169 PHONY += FORCE
170 FORCE:
171
172 # Include all cmd files to get all the depende
173 # for all objects included
174 targets := $(wildcard $(sort $(obj-y) $(in-t
175 cmd_files := $(wildcard $(foreach f,$(targets)
176
177 ifneq ($(cmd_files),)
178 include $(cmd_files)
179 endif
180
181 .PHONY: $(PHONY)
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