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 ($(V),1) 15 quiet = 16 Q = 17else 18 quiet=quiet_ 19 Q=@ 20endif 21 22ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 23 quiet=silent_ 24endif 25 26build-dir := $(srctree)/tools/build 27 28# Define $(fixdep) for dep-cmd function 29ifeq ($(OUTPUT),) 30 fixdep := $(build-dir)/fixdep 31else 32 fixdep := $(OUTPUT)/fixdep 33endif 34 35# Generic definitions 36include $(build-dir)/Build.include 37 38# do not force detected configuration 39-include $(OUTPUT).config-detected 40 41# Init all relevant variables used in build files so 42# 1) they have correct type 43# 2) they do not inherit any value from the environment 44subdir-y := 45obj-y := 46subdir-y := 47subdir-obj-y := 48 49# Build definitions 50build-file := $(dir)/Build 51-include $(build-file) 52 53quiet_cmd_flex = FLEX $@ 54quiet_cmd_bison = BISON $@ 55 56# Create directory unless it exists 57quiet_cmd_mkdir = MKDIR $(dir $@) 58 cmd_mkdir = mkdir -p $(dir $@) 59 rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir)) 60 61# Compile command 62quiet_cmd_cc_o_c = CC $@ 63 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 64 65quiet_cmd_host_cc_o_c = HOSTCC $@ 66 cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $< 67 68quiet_cmd_cxx_o_c = CXX $@ 69 cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $< 70 71quiet_cmd_cpp_i_c = CPP $@ 72 cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $< 73 74quiet_cmd_cc_s_c = AS $@ 75 cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $< 76 77quiet_cmd_gen = GEN $@ 78 79# Link agregate command 80# If there's nothing to link, create empty $@ object. 81quiet_cmd_ld_multi = LD $@ 82 cmd_ld_multi = $(if $(strip $(obj-y)),\ 83 $(LD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@) 84 85quiet_cmd_host_ld_multi = HOSTLD $@ 86 cmd_host_ld_multi = $(if $(strip $(obj-y)),\ 87 $(HOSTLD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@) 88 89ifneq ($(filter $(obj),$(hostprogs)),) 90 host = host_ 91endif 92 93# Build rules 94$(OUTPUT)%.o: %.c FORCE 95 $(call rule_mkdir) 96 $(call if_changed_dep,$(host)cc_o_c) 97 98$(OUTPUT)%.o: %.cpp FORCE 99 $(call rule_mkdir) 100 $(call if_changed_dep,cxx_o_c) 101 102$(OUTPUT)%.o: %.S FORCE 103 $(call rule_mkdir) 104 $(call if_changed_dep,$(host)cc_o_c) 105 106$(OUTPUT)%.i: %.c FORCE 107 $(call rule_mkdir) 108 $(call if_changed_dep,cpp_i_c) 109 110$(OUTPUT)%.s: %.S FORCE 111 $(call rule_mkdir) 112 $(call if_changed_dep,cpp_i_c) 113 114$(OUTPUT)%.s: %.c FORCE 115 $(call rule_mkdir) 116 $(call if_changed_dep,cc_s_c) 117 118# Gather build data: 119# obj-y - list of build objects 120# subdir-y - list of directories to nest 121# subdir-obj-y - list of directories objects 'dir/$(obj)-in.o' 122obj-y := $($(obj)-y) 123subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) 124obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y)) 125subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y)) 126 127# '$(OUTPUT)/dir' prefix to all objects 128objprefix := $(subst ./,,$(OUTPUT)$(dir)/) 129obj-y := $(addprefix $(objprefix),$(obj-y)) 130subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y)) 131 132# Final '$(obj)-in.o' object 133in-target := $(objprefix)$(obj)-in.o 134 135PHONY += $(subdir-y) 136 137$(subdir-y): 138 $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj) 139 140$(sort $(subdir-obj-y)): $(subdir-y) ; 141 142$(in-target): $(obj-y) FORCE 143 $(call rule_mkdir) 144 $(call if_changed,$(host)ld_multi) 145 146__build: $(in-target) 147 @: 148 149PHONY += FORCE 150FORCE: 151 152# Include all cmd files to get all the dependency rules 153# for all objects included 154targets := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS))) 155cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 156 157ifneq ($(cmd_files),) 158 include $(cmd_files) 159endif 160 161.PHONY: $(PHONY) 162