1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 ### 2 ###
3 # Main build makefile. 3 # Main build makefile.
4 # 4 #
5 # Lots of this code have been borrowed or hea 5 # Lots of this code have been borrowed or heavily inspired from parts
6 # of kbuild code, which is not credited, but 6 # of kbuild code, which is not credited, but mostly developed by:
7 # 7 #
8 # Copyright (C) Sam Ravnborg <sam@mars.ravnbor 8 # Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
9 # Copyright (C) Linus Torvalds <torvalds@linux 9 # Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
10 # 10 #
11 11
12 PHONY := __build 12 PHONY := __build
13 __build: 13 __build:
14 14
15 ifeq ($(V),1) 15 ifeq ($(V),1)
16 quiet = 16 quiet =
17 Q = 17 Q =
18 else 18 else
19 quiet=quiet_ 19 quiet=quiet_
20 Q=@ 20 Q=@
21 endif 21 endif
22 22
23 # If the user is running make -s (silent mode) 23 # If the user is running make -s (silent mode), suppress echoing of commands
24 # make-4.0 (and later) keep single letter opti 24 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
25 ifeq ($(filter 3.%,$(MAKE_VERSION)),) 25 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
26 short-opts := $(firstword -$(MAKEFLAGS)) 26 short-opts := $(firstword -$(MAKEFLAGS))
27 else 27 else
28 short-opts := $(filter-out --%,$(MAKEFLAGS)) 28 short-opts := $(filter-out --%,$(MAKEFLAGS))
29 endif 29 endif
30 30
31 ifneq ($(findstring s,$(short-opts)),) 31 ifneq ($(findstring s,$(short-opts)),)
32 quiet=silent_ 32 quiet=silent_
33 endif 33 endif
34 34
35 build-dir := $(srctree)/tools/build 35 build-dir := $(srctree)/tools/build
36 36
37 # Define $(fixdep) for dep-cmd function 37 # Define $(fixdep) for dep-cmd function
38 ifeq ($(OUTPUT),) 38 ifeq ($(OUTPUT),)
39 fixdep := $(build-dir)/fixdep 39 fixdep := $(build-dir)/fixdep
40 else 40 else
41 fixdep := $(OUTPUT)/fixdep 41 fixdep := $(OUTPUT)/fixdep
42 endif 42 endif
43 43
44 # Generic definitions 44 # Generic definitions
45 include $(build-dir)/Build.include 45 include $(build-dir)/Build.include
46 46
47 # do not force detected configuration 47 # do not force detected configuration
48 -include $(OUTPUT).config-detected 48 -include $(OUTPUT).config-detected
49 49
50 # Init all relevant variables used in build fi 50 # Init all relevant variables used in build files so
51 # 1) they have correct type 51 # 1) they have correct type
52 # 2) they do not inherit any value from the en 52 # 2) they do not inherit any value from the environment
53 subdir-y := 53 subdir-y :=
54 obj-y := 54 obj-y :=
55 subdir-y := 55 subdir-y :=
56 subdir-obj-y := 56 subdir-obj-y :=
57 57
58 # Build definitions 58 # Build definitions
59 build-file := $(dir)/Build 59 build-file := $(dir)/Build
60 -include $(build-file) 60 -include $(build-file)
61 61
62 quiet_cmd_flex = FLEX $@ 62 quiet_cmd_flex = FLEX $@
63 quiet_cmd_bison = BISON $@ 63 quiet_cmd_bison = BISON $@
64 quiet_cmd_test = TEST $@ 64 quiet_cmd_test = TEST $@
65 65
66 # Create directory unless it exists 66 # Create directory unless it exists
67 quiet_cmd_mkdir = MKDIR $(dir $@) 67 quiet_cmd_mkdir = MKDIR $(dir $@)
68 cmd_mkdir = mkdir -p $(dir $@) 68 cmd_mkdir = mkdir -p $(dir $@)
69 rule_mkdir = $(if $(wildcard $(dir $@)),, 69 rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir))
70 70
71 # Compile command 71 # Compile command
72 quiet_cmd_cc_o_c = CC $@ 72 quiet_cmd_cc_o_c = CC $@
73 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $ 73 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
74 74
75 quiet_cmd_host_cc_o_c = HOSTCC $@ 75 quiet_cmd_host_cc_o_c = HOSTCC $@
76 cmd_host_cc_o_c = $(HOSTCC) $(host_c_fla 76 cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $<
77 77
78 quiet_cmd_cxx_o_c = CXX $@ 78 quiet_cmd_cxx_o_c = CXX $@
79 cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o 79 cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $<
80 80
81 quiet_cmd_cpp_i_c = CPP $@ 81 quiet_cmd_cpp_i_c = CPP $@
82 cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ 82 cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $<
83 83
84 quiet_cmd_cc_s_c = AS $@ 84 quiet_cmd_cc_s_c = AS $@
85 cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $ 85 cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
86 86
87 quiet_cmd_gen = GEN $@ 87 quiet_cmd_gen = GEN $@
88 88
89 # Link agregate command 89 # Link agregate command
90 # If there's nothing to link, create empty $@ 90 # If there's nothing to link, create empty $@ object.
91 quiet_cmd_ld_multi = LD $@ 91 quiet_cmd_ld_multi = LD $@
92 cmd_ld_multi = $(if $(strip $(obj-y)),\ 92 cmd_ld_multi = $(if $(strip $(obj-y)),\
93 $(LD) -r -o $@ $(filter 93 $(LD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
94 94
95 quiet_cmd_host_ld_multi = HOSTLD $@ 95 quiet_cmd_host_ld_multi = HOSTLD $@
96 cmd_host_ld_multi = $(if $(strip $(obj-y 96 cmd_host_ld_multi = $(if $(strip $(obj-y)),\
97 $(HOSTLD) -r -o $@ 97 $(HOSTLD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@)
98 98
99 ifneq ($(filter $(obj),$(hostprogs)),) 99 ifneq ($(filter $(obj),$(hostprogs)),)
100 host = host_ 100 host = host_
101 endif 101 endif
102 102
103 # Build rules 103 # Build rules
104 $(OUTPUT)%.o: %.c FORCE 104 $(OUTPUT)%.o: %.c FORCE
105 $(call rule_mkdir) 105 $(call rule_mkdir)
106 $(call if_changed_dep,$(host)cc_o_c) 106 $(call if_changed_dep,$(host)cc_o_c)
107 107
108 $(OUTPUT)%.o: %.cpp FORCE 108 $(OUTPUT)%.o: %.cpp FORCE
109 $(call rule_mkdir) 109 $(call rule_mkdir)
110 $(call if_changed_dep,cxx_o_c) 110 $(call if_changed_dep,cxx_o_c)
111 111
112 $(OUTPUT)%.o: %.S FORCE 112 $(OUTPUT)%.o: %.S FORCE
113 $(call rule_mkdir) 113 $(call rule_mkdir)
114 $(call if_changed_dep,$(host)cc_o_c) 114 $(call if_changed_dep,$(host)cc_o_c)
115 115
116 $(OUTPUT)%.i: %.c FORCE 116 $(OUTPUT)%.i: %.c FORCE
117 $(call rule_mkdir) 117 $(call rule_mkdir)
118 $(call if_changed_dep,cpp_i_c) 118 $(call if_changed_dep,cpp_i_c)
119 119
120 $(OUTPUT)%.s: %.S FORCE 120 $(OUTPUT)%.s: %.S FORCE
121 $(call rule_mkdir) 121 $(call rule_mkdir)
122 $(call if_changed_dep,cpp_i_c) 122 $(call if_changed_dep,cpp_i_c)
123 123
124 $(OUTPUT)%.s: %.c FORCE 124 $(OUTPUT)%.s: %.c FORCE
125 $(call rule_mkdir) 125 $(call rule_mkdir)
126 $(call if_changed_dep,cc_s_c) 126 $(call if_changed_dep,cc_s_c)
127 127
128 # bison and flex files are generated in the OU 128 # bison and flex files are generated in the OUTPUT directory
129 # so it needs a separate rule to depend on the 129 # so it needs a separate rule to depend on them properly
130 $(OUTPUT)%-bison.o: $(OUTPUT)%-bison.c FORCE 130 $(OUTPUT)%-bison.o: $(OUTPUT)%-bison.c FORCE
131 $(call rule_mkdir) 131 $(call rule_mkdir)
132 $(call if_changed_dep,$(host)cc_o_c) 132 $(call if_changed_dep,$(host)cc_o_c)
133 133
134 $(OUTPUT)%-flex.o: $(OUTPUT)%-flex.c FORCE 134 $(OUTPUT)%-flex.o: $(OUTPUT)%-flex.c FORCE
135 $(call rule_mkdir) 135 $(call rule_mkdir)
136 $(call if_changed_dep,$(host)cc_o_c) 136 $(call if_changed_dep,$(host)cc_o_c)
137 137
138 # Gather build data: 138 # Gather build data:
139 # obj-y - list of build objects 139 # obj-y - list of build objects
140 # subdir-y - list of directories to nest 140 # subdir-y - list of directories to nest
141 # subdir-obj-y - list of directories objects 141 # subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
142 obj-y := $($(obj)-y) 142 obj-y := $($(obj)-y)
143 subdir-y := $(patsubst %/,%,$(filter %/, $ 143 subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
144 obj-y := $(patsubst %/, %/$(obj)-in.o, 144 obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
145 subdir-obj-y := $(filter %/$(obj)-in.o, $(obj- 145 subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
146 146
147 # '$(OUTPUT)/dir' prefix to all objects 147 # '$(OUTPUT)/dir' prefix to all objects
148 objprefix := $(subst ./,,$(OUTPUT)$(dir)/) 148 objprefix := $(subst ./,,$(OUTPUT)$(dir)/)
149 obj-y := $(addprefix $(objprefix),$(obj 149 obj-y := $(addprefix $(objprefix),$(obj-y))
150 subdir-obj-y := $(addprefix $(objprefix),$(sub 150 subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y))
151 151
152 # Final '$(obj)-in.o' object 152 # Final '$(obj)-in.o' object
153 in-target := $(objprefix)$(obj)-in.o 153 in-target := $(objprefix)$(obj)-in.o
154 154
155 PHONY += $(subdir-y) 155 PHONY += $(subdir-y)
156 156
157 $(subdir-y): 157 $(subdir-y):
158 $(Q)$(MAKE) -f $(build-dir)/Makefile.b 158 $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
159 159
160 $(sort $(subdir-obj-y)): $(subdir-y) ; 160 $(sort $(subdir-obj-y)): $(subdir-y) ;
161 161
162 $(in-target): $(obj-y) FORCE 162 $(in-target): $(obj-y) FORCE
163 $(call rule_mkdir) 163 $(call rule_mkdir)
164 $(call if_changed,$(host)ld_multi) 164 $(call if_changed,$(host)ld_multi)
165 165
166 __build: $(in-target) 166 __build: $(in-target)
167 @: 167 @:
168 168
169 PHONY += FORCE 169 PHONY += FORCE
170 FORCE: 170 FORCE:
171 171
172 # Include all cmd files to get all the depende 172 # Include all cmd files to get all the dependency rules
173 # for all objects included 173 # for all objects included
174 targets := $(wildcard $(sort $(obj-y) $(in-t 174 targets := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
175 cmd_files := $(wildcard $(foreach f,$(targets) 175 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
176 176
177 ifneq ($(cmd_files),) 177 ifneq ($(cmd_files),)
178 include $(cmd_files) 178 include $(cmd_files)
179 endif 179 endif
180 180
181 .PHONY: $(PHONY) 181 .PHONY: $(PHONY)
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