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c819e2cf JO |
1 | ### |
2 | # Main build makefile. | |
3 | # | |
4 | # Lots of this code have been borrowed or heavily inspired from parts | |
5 | # of kbuild code, which is not credited, but mostly developed by: | |
6 | # | |
7 | # Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015 | |
8 | # Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015 | |
9 | # | |
10 | ||
11 | PHONY := __build | |
12 | __build: | |
13 | ||
14 | ifeq ($(V),1) | |
15 | quiet = | |
16 | else | |
17 | quiet=quiet_ | |
18 | endif | |
19 | ||
20 | build-dir := $(srctree)/tools/build | |
21 | ||
22 | # Generic definitions | |
23 | include $(build-dir)/Build.include | |
24 | ||
fcfd6611 JO |
25 | # do not force detected configuration |
26 | -include .config-detected | |
27 | ||
c819e2cf JO |
28 | # Init all relevant variables used in build files so |
29 | # 1) they have correct type | |
30 | # 2) they do not inherit any value from the environment | |
31 | subdir-y := | |
32 | obj-y := | |
33 | subdir-y := | |
34 | subdir-obj-y := | |
35 | ||
36 | # Build definitions | |
37 | build-file := $(dir)/Build | |
38 | include $(build-file) | |
39 | ||
9352aaba JO |
40 | quiet_cmd_flex = FLEX $@ |
41 | quiet_cmd_bison = BISON $@ | |
42 | ||
579ff6d4 JO |
43 | # Create directory unless it exists |
44 | quiet_cmd_mkdir = MKDIR $(dir $@) | |
45 | cmd_mkdir = mkdir -p $(dir $@) | |
46 | rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir)) | |
47 | ||
c819e2cf JO |
48 | # Compile command |
49 | quiet_cmd_cc_o_c = CC $@ | |
50 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
51 | ||
1999307b JO |
52 | quiet_cmd_cc_i_c = CPP $@ |
53 | cmd_cc_i_c = $(CC) $(c_flags) -E -o $@ $< | |
54 | ||
55 | quiet_cmd_cc_s_c = AS $@ | |
56 | cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $< | |
57 | ||
c819e2cf JO |
58 | # Link agregate command |
59 | # If there's nothing to link, create empty $@ object. | |
60 | quiet_cmd_ld_multi = LD $@ | |
61 | cmd_ld_multi = $(if $(strip $(obj-y)),\ | |
62 | $(LD) -r -o $@ $(obj-y),rm -f $@; $(AR) rcs $@) | |
63 | ||
64 | # Build rules | |
65 | $(OUTPUT)%.o: %.c FORCE | |
579ff6d4 | 66 | $(call rule_mkdir) |
c819e2cf JO |
67 | $(call if_changed_dep,cc_o_c) |
68 | ||
69 | $(OUTPUT)%.o: %.S FORCE | |
579ff6d4 | 70 | $(call rule_mkdir) |
c819e2cf JO |
71 | $(call if_changed_dep,cc_o_c) |
72 | ||
1999307b JO |
73 | $(OUTPUT)%.i: %.c FORCE |
74 | $(call rule_mkdir) | |
75 | $(call if_changed_dep,cc_i_c) | |
76 | ||
77 | $(OUTPUT)%.i: %.S FORCE | |
78 | $(call rule_mkdir) | |
79 | $(call if_changed_dep,cc_i_c) | |
80 | ||
81 | $(OUTPUT)%.s: %.c FORCE | |
82 | $(call rule_mkdir) | |
83 | $(call if_changed_dep,cc_s_c) | |
84 | ||
c819e2cf JO |
85 | # Gather build data: |
86 | # obj-y - list of build objects | |
87 | # subdir-y - list of directories to nest | |
88 | # subdir-obj-y - list of directories objects 'dir/$(obj)-in.o' | |
89 | obj-y := $($(obj)-y) | |
90 | subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) | |
91 | obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y)) | |
92 | subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y)) | |
93 | ||
94 | # '$(OUTPUT)/dir' prefix to all objects | |
95 | prefix := $(subst ./,,$(OUTPUT)$(dir)/) | |
96 | obj-y := $(addprefix $(prefix),$(obj-y)) | |
97 | subdir-obj-y := $(addprefix $(prefix),$(subdir-obj-y)) | |
98 | ||
99 | # Final '$(obj)-in.o' object | |
100 | in-target := $(prefix)$(obj)-in.o | |
101 | ||
102 | PHONY += $(subdir-y) | |
103 | ||
104 | $(subdir-y): | |
105 | @$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj) | |
106 | ||
107 | $(sort $(subdir-obj-y)): $(subdir-y) ; | |
108 | ||
109 | $(in-target): $(obj-y) FORCE | |
110 | $(call rule_mkdir) | |
111 | $(call if_changed,ld_multi) | |
112 | ||
113 | __build: $(in-target) | |
114 | @: | |
115 | ||
116 | PHONY += FORCE | |
117 | FORCE: | |
118 | ||
119 | # Include all cmd files to get all the dependency rules | |
120 | # for all objects included | |
1999307b | 121 | targets := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS))) |
c819e2cf JO |
122 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) |
123 | ||
124 | ifneq ($(cmd_files),) | |
125 | include $(cmd_files) | |
126 | endif | |
127 | ||
128 | .PHONY: $(PHONY) |