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b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
c819e2cf JO |
2 | ### |
3 | # Main build makefile. | |
4 | # | |
5 | # Lots of this code have been borrowed or heavily inspired from parts | |
6 | # of kbuild code, which is not credited, but mostly developed by: | |
7 | # | |
8 | # Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015 | |
9 | # Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015 | |
10 | # | |
11 | ||
12 | PHONY := __build | |
13 | __build: | |
14 | ||
15 | ifeq ($(V),1) | |
16 | quiet = | |
ceed252f | 17 | Q = |
c819e2cf JO |
18 | else |
19 | quiet=quiet_ | |
ceed252f | 20 | Q=@ |
c819e2cf JO |
21 | endif |
22 | ||
6f0fa58e | 23 | ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) |
e572d088 JP |
24 | quiet=silent_ |
25 | endif | |
e572d088 | 26 | |
c819e2cf JO |
27 | build-dir := $(srctree)/tools/build |
28 | ||
9fb81323 JO |
29 | # Define $(fixdep) for dep-cmd function |
30 | ifeq ($(OUTPUT),) | |
31 | fixdep := $(build-dir)/fixdep | |
32 | else | |
33 | fixdep := $(OUTPUT)/fixdep | |
34 | endif | |
35 | ||
c819e2cf JO |
36 | # Generic definitions |
37 | include $(build-dir)/Build.include | |
38 | ||
fcfd6611 | 39 | # do not force detected configuration |
64227379 | 40 | -include $(OUTPUT).config-detected |
fcfd6611 | 41 | |
c819e2cf JO |
42 | # Init all relevant variables used in build files so |
43 | # 1) they have correct type | |
44 | # 2) they do not inherit any value from the environment | |
45 | subdir-y := | |
46 | obj-y := | |
47 | subdir-y := | |
48 | subdir-obj-y := | |
49 | ||
50 | # Build definitions | |
51 | build-file := $(dir)/Build | |
d7a3d85e | 52 | -include $(build-file) |
c819e2cf | 53 | |
c6de37dd KC |
54 | quiet_cmd_flex = FLEX $@ |
55 | quiet_cmd_bison = BISON $@ | |
e30f3405 | 56 | quiet_cmd_test = TEST $@ |
9352aaba | 57 | |
579ff6d4 | 58 | # Create directory unless it exists |
c6de37dd | 59 | quiet_cmd_mkdir = MKDIR $(dir $@) |
579ff6d4 JO |
60 | cmd_mkdir = mkdir -p $(dir $@) |
61 | rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir)) | |
62 | ||
c819e2cf | 63 | # Compile command |
c6de37dd | 64 | quiet_cmd_cc_o_c = CC $@ |
c819e2cf JO |
65 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< |
66 | ||
c6de37dd | 67 | quiet_cmd_host_cc_o_c = HOSTCC $@ |
0c3b7e42 JO |
68 | cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $< |
69 | ||
c6de37dd | 70 | quiet_cmd_cxx_o_c = CXX $@ |
f61bdc33 WN |
71 | cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $< |
72 | ||
c6de37dd | 73 | quiet_cmd_cpp_i_c = CPP $@ |
23d43848 | 74 | cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $< |
1999307b | 75 | |
c6de37dd | 76 | quiet_cmd_cc_s_c = AS $@ |
1999307b JO |
77 | cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $< |
78 | ||
c6de37dd | 79 | quiet_cmd_gen = GEN $@ |
237fae79 | 80 | |
c819e2cf JO |
81 | # Link agregate command |
82 | # If there's nothing to link, create empty $@ object. | |
c6de37dd | 83 | quiet_cmd_ld_multi = LD $@ |
c819e2cf | 84 | cmd_ld_multi = $(if $(strip $(obj-y)),\ |
0c3b7e42 JO |
85 | $(LD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@) |
86 | ||
c6de37dd | 87 | quiet_cmd_host_ld_multi = HOSTLD $@ |
0c3b7e42 JO |
88 | cmd_host_ld_multi = $(if $(strip $(obj-y)),\ |
89 | $(HOSTLD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@) | |
90 | ||
91 | ifneq ($(filter $(obj),$(hostprogs)),) | |
92 | host = host_ | |
93 | endif | |
c819e2cf JO |
94 | |
95 | # Build rules | |
96 | $(OUTPUT)%.o: %.c FORCE | |
579ff6d4 | 97 | $(call rule_mkdir) |
0c3b7e42 | 98 | $(call if_changed_dep,$(host)cc_o_c) |
c819e2cf | 99 | |
f61bdc33 WN |
100 | $(OUTPUT)%.o: %.cpp FORCE |
101 | $(call rule_mkdir) | |
102 | $(call if_changed_dep,cxx_o_c) | |
103 | ||
c819e2cf | 104 | $(OUTPUT)%.o: %.S FORCE |
579ff6d4 | 105 | $(call rule_mkdir) |
0c3b7e42 | 106 | $(call if_changed_dep,$(host)cc_o_c) |
c819e2cf | 107 | |
1999307b JO |
108 | $(OUTPUT)%.i: %.c FORCE |
109 | $(call rule_mkdir) | |
23d43848 | 110 | $(call if_changed_dep,cpp_i_c) |
1999307b | 111 | |
67678793 | 112 | $(OUTPUT)%.s: %.S FORCE |
1999307b | 113 | $(call rule_mkdir) |
23d43848 | 114 | $(call if_changed_dep,cpp_i_c) |
1999307b JO |
115 | |
116 | $(OUTPUT)%.s: %.c FORCE | |
117 | $(call rule_mkdir) | |
118 | $(call if_changed_dep,cc_s_c) | |
119 | ||
7822a891 NK |
120 | # bison and flex files are generated in the OUTPUT directory |
121 | # so it needs a separate rule to depend on them properly | |
122 | $(OUTPUT)%-bison.o: $(OUTPUT)%-bison.c FORCE | |
123 | $(call rule_mkdir) | |
124 | $(call if_changed_dep,$(host)cc_o_c) | |
125 | ||
126 | $(OUTPUT)%-flex.o: $(OUTPUT)%-flex.c FORCE | |
127 | $(call rule_mkdir) | |
128 | $(call if_changed_dep,$(host)cc_o_c) | |
129 | ||
c819e2cf JO |
130 | # Gather build data: |
131 | # obj-y - list of build objects | |
132 | # subdir-y - list of directories to nest | |
133 | # subdir-obj-y - list of directories objects 'dir/$(obj)-in.o' | |
134 | obj-y := $($(obj)-y) | |
135 | subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) | |
136 | obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y)) | |
137 | subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y)) | |
138 | ||
139 | # '$(OUTPUT)/dir' prefix to all objects | |
75e84ab9 LW |
140 | objprefix := $(subst ./,,$(OUTPUT)$(dir)/) |
141 | obj-y := $(addprefix $(objprefix),$(obj-y)) | |
142 | subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y)) | |
c819e2cf JO |
143 | |
144 | # Final '$(obj)-in.o' object | |
75e84ab9 | 145 | in-target := $(objprefix)$(obj)-in.o |
c819e2cf JO |
146 | |
147 | PHONY += $(subdir-y) | |
148 | ||
149 | $(subdir-y): | |
ceed252f | 150 | $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj) |
c819e2cf JO |
151 | |
152 | $(sort $(subdir-obj-y)): $(subdir-y) ; | |
153 | ||
154 | $(in-target): $(obj-y) FORCE | |
155 | $(call rule_mkdir) | |
0c3b7e42 | 156 | $(call if_changed,$(host)ld_multi) |
c819e2cf JO |
157 | |
158 | __build: $(in-target) | |
159 | @: | |
160 | ||
161 | PHONY += FORCE | |
162 | FORCE: | |
163 | ||
164 | # Include all cmd files to get all the dependency rules | |
165 | # for all objects included | |
1999307b | 166 | targets := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS))) |
c819e2cf JO |
167 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) |
168 | ||
169 | ifneq ($(cmd_files),) | |
170 | include $(cmd_files) | |
171 | endif | |
172 | ||
173 | .PHONY: $(PHONY) |