1 # SPDX-License-Identifier: GPL-2.0 <<
2 ### 1 ###
3 # Main build makefile. 2 # Main build makefile.
4 # 3 #
5 # Lots of this code have been borrowed or hea 4 # Lots of this code have been borrowed or heavily inspired from parts
6 # of kbuild code, which is not credited, but 5 # of kbuild code, which is not credited, but mostly developed by:
7 # 6 #
8 # Copyright (C) Sam Ravnborg <sam@mars.ravnbor 7 # Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
9 # Copyright (C) Linus Torvalds <torvalds@linux 8 # Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
10 # 9 #
11 10
12 PHONY := __build 11 PHONY := __build
13 __build: 12 __build:
14 13
15 ifeq ($(V),1) 14 ifeq ($(V),1)
16 quiet = 15 quiet =
17 Q = 16 Q =
18 else 17 else
19 quiet=quiet_ 18 quiet=quiet_
20 Q=@ 19 Q=@
21 endif 20 endif
22 21
23 # If the user is running make -s (silent mode) !! 22 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
24 # make-4.0 (and later) keep single letter opti !! 23 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
25 ifeq ($(filter 3.%,$(MAKE_VERSION)),) !! 24 quiet=silent_
26 short-opts := $(firstword -$(MAKEFLAGS)) <<
27 else <<
28 short-opts := $(filter-out --%,$(MAKEFLAGS)) <<
29 endif 25 endif
30 !! 26 else # make-3.8x
31 ifneq ($(findstring s,$(short-opts)),) !! 27 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
32 quiet=silent_ 28 quiet=silent_
33 endif 29 endif
>> 30 endif
34 31
35 build-dir := $(srctree)/tools/build 32 build-dir := $(srctree)/tools/build
36 33
37 # Define $(fixdep) for dep-cmd function 34 # Define $(fixdep) for dep-cmd function
38 ifeq ($(OUTPUT),) 35 ifeq ($(OUTPUT),)
39 fixdep := $(build-dir)/fixdep 36 fixdep := $(build-dir)/fixdep
40 else 37 else
41 fixdep := $(OUTPUT)/fixdep 38 fixdep := $(OUTPUT)/fixdep
42 endif 39 endif
43 40
44 # Generic definitions 41 # Generic definitions
45 include $(build-dir)/Build.include 42 include $(build-dir)/Build.include
46 43
47 # do not force detected configuration 44 # do not force detected configuration
48 -include $(OUTPUT).config-detected 45 -include $(OUTPUT).config-detected
49 46
50 # Init all relevant variables used in build fi 47 # Init all relevant variables used in build files so
51 # 1) they have correct type 48 # 1) they have correct type
52 # 2) they do not inherit any value from the en 49 # 2) they do not inherit any value from the environment
53 subdir-y := 50 subdir-y :=
54 obj-y := 51 obj-y :=
55 subdir-y := 52 subdir-y :=
56 subdir-obj-y := 53 subdir-obj-y :=
57 54
58 # Build definitions 55 # Build definitions
59 build-file := $(dir)/Build 56 build-file := $(dir)/Build
60 -include $(build-file) 57 -include $(build-file)
61 58
62 quiet_cmd_flex = FLEX $@ !! 59 quiet_cmd_flex = FLEX $@
63 quiet_cmd_bison = BISON $@ !! 60 quiet_cmd_bison = BISON $@
64 quiet_cmd_test = TEST $@ <<
65 61
66 # Create directory unless it exists 62 # Create directory unless it exists
67 quiet_cmd_mkdir = MKDIR $(dir $@) !! 63 quiet_cmd_mkdir = MKDIR $(dir $@)
68 cmd_mkdir = mkdir -p $(dir $@) 64 cmd_mkdir = mkdir -p $(dir $@)
69 rule_mkdir = $(if $(wildcard $(dir $@)),, 65 rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir))
70 66
71 # Compile command 67 # Compile command
72 quiet_cmd_cc_o_c = CC $@ !! 68 quiet_cmd_cc_o_c = CC $@
73 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $ 69 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
74 70
75 quiet_cmd_host_cc_o_c = HOSTCC $@ !! 71 quiet_cmd_host_cc_o_c = HOSTCC $@
76 cmd_host_cc_o_c = $(HOSTCC) $(host_c_fla 72 cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $<
77 73
78 quiet_cmd_cxx_o_c = CXX $@ !! 74 quiet_cmd_cxx_o_c = CXX $@
79 cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o 75 cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $<
80 76
81 quiet_cmd_cpp_i_c = CPP $@ !! 77 quiet_cmd_cpp_i_c = CPP $@
82 cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ 78 cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $<
83 79
84 quiet_cmd_cc_s_c = AS $@ !! 80 quiet_cmd_cc_s_c = AS $@
85 cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $ 81 cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
86 82
87 quiet_cmd_gen = GEN $@ !! 83 quiet_cmd_gen = GEN $@
88 84
89 # Link agregate command 85 # Link agregate command
90 # If there's nothing to link, create empty $@ 86 # If there's nothing to link, create empty $@ object.
91 quiet_cmd_ld_multi = LD $@ !! 87 quiet_cmd_ld_multi = LD $@
92 cmd_ld_multi = $(if $(strip $(obj-y)),\ 88 cmd_ld_multi = $(if $(strip $(obj-y)),\
93 $(LD) -r -o $@ $(filter 89 $(LD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
94 90
95 quiet_cmd_host_ld_multi = HOSTLD $@ !! 91 quiet_cmd_host_ld_multi = HOSTLD $@
96 cmd_host_ld_multi = $(if $(strip $(obj-y 92 cmd_host_ld_multi = $(if $(strip $(obj-y)),\
97 $(HOSTLD) -r -o $@ 93 $(HOSTLD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@)
98 94
99 ifneq ($(filter $(obj),$(hostprogs)),) 95 ifneq ($(filter $(obj),$(hostprogs)),)
100 host = host_ 96 host = host_
101 endif 97 endif
102 98
103 # Build rules 99 # Build rules
104 $(OUTPUT)%.o: %.c FORCE 100 $(OUTPUT)%.o: %.c FORCE
105 $(call rule_mkdir) 101 $(call rule_mkdir)
106 $(call if_changed_dep,$(host)cc_o_c) 102 $(call if_changed_dep,$(host)cc_o_c)
107 103
108 $(OUTPUT)%.o: %.cpp FORCE 104 $(OUTPUT)%.o: %.cpp FORCE
109 $(call rule_mkdir) 105 $(call rule_mkdir)
110 $(call if_changed_dep,cxx_o_c) 106 $(call if_changed_dep,cxx_o_c)
111 107
112 $(OUTPUT)%.o: %.S FORCE 108 $(OUTPUT)%.o: %.S FORCE
113 $(call rule_mkdir) 109 $(call rule_mkdir)
114 $(call if_changed_dep,$(host)cc_o_c) 110 $(call if_changed_dep,$(host)cc_o_c)
115 111
116 $(OUTPUT)%.i: %.c FORCE 112 $(OUTPUT)%.i: %.c FORCE
117 $(call rule_mkdir) 113 $(call rule_mkdir)
118 $(call if_changed_dep,cpp_i_c) 114 $(call if_changed_dep,cpp_i_c)
119 115
120 $(OUTPUT)%.s: %.S FORCE 116 $(OUTPUT)%.s: %.S FORCE
121 $(call rule_mkdir) 117 $(call rule_mkdir)
122 $(call if_changed_dep,cpp_i_c) 118 $(call if_changed_dep,cpp_i_c)
123 119
124 $(OUTPUT)%.s: %.c FORCE 120 $(OUTPUT)%.s: %.c FORCE
125 $(call rule_mkdir) 121 $(call rule_mkdir)
126 $(call if_changed_dep,cc_s_c) 122 $(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) <<
137 123
138 # Gather build data: 124 # Gather build data:
139 # obj-y - list of build objects 125 # obj-y - list of build objects
140 # subdir-y - list of directories to nest 126 # subdir-y - list of directories to nest
141 # subdir-obj-y - list of directories objects 127 # subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
142 obj-y := $($(obj)-y) 128 obj-y := $($(obj)-y)
143 subdir-y := $(patsubst %/,%,$(filter %/, $ 129 subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
144 obj-y := $(patsubst %/, %/$(obj)-in.o, 130 obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
145 subdir-obj-y := $(filter %/$(obj)-in.o, $(obj- 131 subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
146 132
147 # '$(OUTPUT)/dir' prefix to all objects 133 # '$(OUTPUT)/dir' prefix to all objects
148 objprefix := $(subst ./,,$(OUTPUT)$(dir)/) 134 objprefix := $(subst ./,,$(OUTPUT)$(dir)/)
149 obj-y := $(addprefix $(objprefix),$(obj 135 obj-y := $(addprefix $(objprefix),$(obj-y))
150 subdir-obj-y := $(addprefix $(objprefix),$(sub 136 subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y))
151 137
152 # Final '$(obj)-in.o' object 138 # Final '$(obj)-in.o' object
153 in-target := $(objprefix)$(obj)-in.o 139 in-target := $(objprefix)$(obj)-in.o
154 140
155 PHONY += $(subdir-y) 141 PHONY += $(subdir-y)
156 142
157 $(subdir-y): 143 $(subdir-y):
158 $(Q)$(MAKE) -f $(build-dir)/Makefile.b 144 $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
159 145
160 $(sort $(subdir-obj-y)): $(subdir-y) ; 146 $(sort $(subdir-obj-y)): $(subdir-y) ;
161 147
162 $(in-target): $(obj-y) FORCE 148 $(in-target): $(obj-y) FORCE
163 $(call rule_mkdir) 149 $(call rule_mkdir)
164 $(call if_changed,$(host)ld_multi) 150 $(call if_changed,$(host)ld_multi)
165 151
166 __build: $(in-target) 152 __build: $(in-target)
167 @: 153 @:
168 154
169 PHONY += FORCE 155 PHONY += FORCE
170 FORCE: 156 FORCE:
171 157
172 # Include all cmd files to get all the depende 158 # Include all cmd files to get all the dependency rules
173 # for all objects included 159 # for all objects included
174 targets := $(wildcard $(sort $(obj-y) $(in-t 160 targets := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
175 cmd_files := $(wildcard $(foreach f,$(targets) 161 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
176 162
177 ifneq ($(cmd_files),) 163 ifneq ($(cmd_files),)
178 include $(cmd_files) 164 include $(cmd_files)
179 endif 165 endif
180 166
181 .PHONY: $(PHONY) 167 .PHONY: $(PHONY)
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