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