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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | ### # Main build makefile. # # Lots of this code have been borrowed or heavily inspired from parts # of kbuild code, which is not credited, but mostly developed by: # # Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015 # Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015 # PHONY := __build __build: ifeq ($(V),1) quiet = Q = else quiet=quiet_ Q=@ endif ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) quiet=silent_ endif else # make-3.8x ifneq ($(filter s% -s%,$(MAKEFLAGS)),) quiet=silent_ endif endif build-dir := $(srctree)/tools/build # Define $(fixdep) for dep-cmd function ifeq ($(OUTPUT),) fixdep := $(build-dir)/fixdep else fixdep := $(OUTPUT)/fixdep endif # Generic definitions include $(build-dir)/Build.include # do not force detected configuration -include $(OUTPUT).config-detected # Init all relevant variables used in build files so # 1) they have correct type # 2) they do not inherit any value from the environment subdir-y := obj-y := subdir-y := subdir-obj-y := # Build definitions build-file := $(dir)/Build -include $(build-file) quiet_cmd_flex = FLEX $@ quiet_cmd_bison = BISON $@ # Create directory unless it exists quiet_cmd_mkdir = MKDIR $(dir $@) cmd_mkdir = mkdir -p $(dir $@) rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir)) # Compile command quiet_cmd_cc_o_c = CC $@ cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< quiet_cmd_cc_i_c = CPP $@ cmd_cc_i_c = $(CC) $(c_flags) -E -o $@ $< quiet_cmd_cc_s_c = AS $@ cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $< quiet_cmd_gen = GEN $@ # Link agregate command # If there's nothing to link, create empty $@ object. quiet_cmd_ld_multi = LD $@ cmd_ld_multi = $(if $(strip $(obj-y)),\ $(LD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@) # Build rules $(OUTPUT)%.o: %.c FORCE $(call rule_mkdir) $(call if_changed_dep,cc_o_c) $(OUTPUT)%.o: %.S FORCE $(call rule_mkdir) $(call if_changed_dep,cc_o_c) $(OUTPUT)%.i: %.c FORCE $(call rule_mkdir) $(call if_changed_dep,cc_i_c) $(OUTPUT)%.i: %.S FORCE $(call rule_mkdir) $(call if_changed_dep,cc_i_c) $(OUTPUT)%.s: %.c FORCE $(call rule_mkdir) $(call if_changed_dep,cc_s_c) # Gather build data: # obj-y - list of build objects # subdir-y - list of directories to nest # subdir-obj-y - list of directories objects 'dir/$(obj)-in.o' obj-y := $($(obj)-y) subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y)) subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y)) # '$(OUTPUT)/dir' prefix to all objects objprefix := $(subst ./,,$(OUTPUT)$(dir)/) obj-y := $(addprefix $(objprefix),$(obj-y)) subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y)) # Final '$(obj)-in.o' object in-target := $(objprefix)$(obj)-in.o PHONY += $(subdir-y) $(subdir-y): $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj) $(sort $(subdir-obj-y)): $(subdir-y) ; $(in-target): $(obj-y) FORCE $(call rule_mkdir) $(call if_changed,ld_multi) __build: $(in-target) @: PHONY += FORCE FORCE: # Include all cmd files to get all the dependency rules # for all objects included targets := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS))) cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) ifneq ($(cmd_files),) include $(cmd_files) endif .PHONY: $(PHONY) |