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