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_cc_i_c = CPP $@ 62 cmd_cc_i_c = $(CC) $(c_flags) -E -o $@ $< 63 64quiet_cmd_cc_s_c = AS $@ 65 cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $< 66 67quiet_cmd_gen = GEN $@ 68 69# Link agregate command 70# If there's nothing to link, create empty $@ object. 71quiet_cmd_ld_multi = LD $@ 72 cmd_ld_multi = $(if $(strip $(obj-y)),\ 73 $(LD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@) 74 75# Build rules 76$(OUTPUT)%.o: %.c FORCE 77 $(call rule_mkdir) 78 $(call if_changed_dep,cc_o_c) 79 80$(OUTPUT)%.o: %.S FORCE 81 $(call rule_mkdir) 82 $(call if_changed_dep,cc_o_c) 83 84$(OUTPUT)%.i: %.c FORCE 85 $(call rule_mkdir) 86 $(call if_changed_dep,cc_i_c) 87 88$(OUTPUT)%.s: %.S FORCE 89 $(call rule_mkdir) 90 $(call if_changed_dep,cc_i_c) 91 92$(OUTPUT)%.s: %.c FORCE 93 $(call rule_mkdir) 94 $(call if_changed_dep,cc_s_c) 95 96# Gather build data: 97# obj-y - list of build objects 98# subdir-y - list of directories to nest 99# subdir-obj-y - list of directories objects 'dir/$(obj)-in.o' 100obj-y := $($(obj)-y) 101subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) 102obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y)) 103subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y)) 104 105# '$(OUTPUT)/dir' prefix to all objects 106objprefix := $(subst ./,,$(OUTPUT)$(dir)/) 107obj-y := $(addprefix $(objprefix),$(obj-y)) 108subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y)) 109 110# Final '$(obj)-in.o' object 111in-target := $(objprefix)$(obj)-in.o 112 113PHONY += $(subdir-y) 114 115$(subdir-y): 116 $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj) 117 118$(sort $(subdir-obj-y)): $(subdir-y) ; 119 120$(in-target): $(obj-y) FORCE 121 $(call rule_mkdir) 122 $(call if_changed,ld_multi) 123 124__build: $(in-target) 125 @: 126 127PHONY += FORCE 128FORCE: 129 130# Include all cmd files to get all the dependency rules 131# for all objects included 132targets := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS))) 133cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 134 135ifneq ($(cmd_files),) 136 include $(cmd_files) 137endif 138 139.PHONY: $(PHONY) 140