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