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