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# SPDX-License-Identifier: GPL-2.0 ### # 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 ($(V),1) quiet = Q = else quiet=quiet_ Q=@ endif # If the user is running make -s (silent mode), suppress echoing of commands # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. ifeq ($(filter 3.%,$(MAKE_VERSION)),) short-opts := $(firstword -$(MAKEFLAGS)) else short-opts := $(filter-out --%,$(MAKEFLAGS)) endif ifneq ($(findstring s,$(short-opts)),) quiet=silent_ 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 $@ quiet_cmd_test = TEST $@ # 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_host_cc_o_c = HOSTCC $@ cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $< quiet_cmd_cxx_o_c = CXX $@ cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $< quiet_cmd_cpp_i_c = CPP $@ cmd_cpp_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 $@) quiet_cmd_host_ld_multi = HOSTLD $@ cmd_host_ld_multi = $(if $(strip $(obj-y)),\ $(HOSTLD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@) ifneq ($(filter $(obj),$(hostprogs)),) host = host_ endif # Build rules $(OUTPUT)%.o: %.c FORCE $(call rule_mkdir) $(call if_changed_dep,$(host)cc_o_c) $(OUTPUT)%.o: %.cpp FORCE $(call rule_mkdir) $(call if_changed_dep,cxx_o_c) $(OUTPUT)%.o: %.S FORCE $(call rule_mkdir) $(call if_changed_dep,$(host)cc_o_c) $(OUTPUT)%.i: %.c FORCE $(call rule_mkdir) $(call if_changed_dep,cpp_i_c) $(OUTPUT)%.s: %.S FORCE $(call rule_mkdir) $(call if_changed_dep,cpp_i_c) $(OUTPUT)%.s: %.c FORCE $(call rule_mkdir) $(call if_changed_dep,cc_s_c) # bison and flex files are generated in the OUTPUT directory # so it needs a separate rule to depend on them properly $(OUTPUT)%-bison.o: $(OUTPUT)%-bison.c FORCE $(call rule_mkdir) $(call if_changed_dep,$(host)cc_o_c) $(OUTPUT)%-flex.o: $(OUTPUT)%-flex.c FORCE $(call rule_mkdir) $(call if_changed_dep,$(host)cc_o_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) $(call if_changed,$(host)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)