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# ==========================================================================# Building# ========================================================================== src := $(obj) .PHONY: __build__build: # Read .config if it exist, otherwise ignore-include .config # The filename Kbuild has precedence over Makefilekbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-dir)/Makefile) include scripts/Kbuild.includeinclude scripts/Makefile.lib ifdef host-progsifneq ($(hostprogs-y),$(host-progs))$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)hostprogs-y += $(host-progs)endifendif # Do not include host rules unles neededifneq ($(hostprogs-y)$(hostprogs-m),)include scripts/Makefile.hostendif ifneq ($(KBUILD_SRC),)# Create output directory if not already present_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) # Create directories for object files if directory does not exist# Needed when obj-y := dir/file.o syntax is used_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))endif  ifdef EXTRA_TARGETS$(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!)endif ifdef build-targets$(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!)endif ifdef export-objs$(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!)endif ifdef O_TARGET$(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!)endif ifdef L_TARGET$(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!)endif ifdef list-multi$(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!)endif ifndef obj$(warning kbuild: Makefile.build is included improperly)endif # =========================================================================== ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)lib-target := $(obj)/lib.aendif ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)builtin-target := $(obj)/built-in.oendif # We keep a list of all modules in $(MODVERDIR) __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \	 $(if $(KBUILD_MODULES),$(obj-m)) \	 $(subdir-ym) $(always)	@: # Linus' kernel sanity checking toolifneq ($(KBUILD_CHECKSRC),0)  ifeq ($(KBUILD_CHECKSRC),2)    quiet_cmd_force_checksrc = CHECK   $<          cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;  else      quiet_cmd_checksrc     = CHECK   $<            cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;  endifendif  # Compile C sources (.c)# --------------------------------------------------------------------------- # Default is built-in, unless we know otherwisemodkern_cflags := $(CFLAGS_KERNEL)quiet_modtag := $(empty)   $(empty) $(real-objs-m)        : modkern_cflags := $(CFLAGS_MODULE)$(real-objs-m:.o=.i)  : modkern_cflags := $(CFLAGS_MODULE)$(real-objs-m:.o=.s)  : modkern_cflags := $(CFLAGS_MODULE)$(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE) $(real-objs-m)        : quiet_modtag := [M]$(real-objs-m:.o=.i)  : quiet_modtag := [M]$(real-objs-m:.o=.s)  : quiet_modtag := [M]$(real-objs-m:.o=.lst): quiet_modtag := [M] $(obj-m)              : quiet_modtag := [M] # Default for not multi-part modulesmodname = $(*F) $(multi-objs-m)         : modname = $(modname-multi)$(multi-objs-m:.o=.i)   : modname = $(modname-multi)$(multi-objs-m:.o=.s)   : modname = $(modname-multi)$(multi-objs-m:.o=.lst) : modname = $(modname-multi)$(multi-objs-y)         : modname = $(modname-multi)$(multi-objs-y:.o=.i)   : modname = $(modname-multi)$(multi-objs-y:.o=.s)   : modname = $(modname-multi)$(multi-objs-y:.o=.lst) : modname = $(modname-multi) quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@cmd_cc_s_c       = $(CC) $(c_flags) -S -o $@ $<  %.s: %.c FORCE	$(call if_changed_dep,cc_s_c) quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $< %.i: %.c FORCE	$(call if_changed_dep,cc_i_c) # C (.c) files# The C file is compiled and updated dependency information is generated.# (See cmd_cc_o_c + relevant part of rule_cc_o_c) quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@ ifndef CONFIG_MODVERSIONScmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< else# When module versioning is enabled the following steps are executed:# o compile a .tmp_<file>.o from <file>.c# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does#   not export symbols, we just rename .tmp_<file>.o to <file>.o and#   are done.# o otherwise, we calculate symbol versions using the good old#   genksyms on the preprocessed source and postprocess them in a way#   that they are usable as a linker script# o generate <file>.o from .tmp_<file>.o using the linker to#   replace the unresolved symbols __crc_exported_symbol with#   the actual value of the checksum generated by genksyms cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<cmd_modversions =							\	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then	\		$(CPP) -D__GENKSYMS__ $(c_flags) $<			\		| $(GENKSYMS)						\		> $(@D)/.tmp_$(@F:.o=.ver);				\									\		$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) 		\			-T $(@D)/.tmp_$(@F:.o=.ver);			\		rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);	\	else								\		mv -f $(@D)/.tmp_$(@F) $@;				\	fi;endif define rule_cc_o_c	$(if $($(quiet)cmd_checksrc),echo '  $($(quiet)cmd_checksrc)';)   \	$(cmd_checksrc)							  \	$(if $($(quiet)cmd_cc_o_c),echo '  $(subst ','\'',$($(quiet)cmd_cc_o_c))';)  \	$(cmd_cc_o_c);							  \	$(cmd_modversions)						  \	scripts/basic/fixdep $(depfile) $@ '$(subst ','\'',$(cmd_cc_o_c))' > $(@D)/.$(@F).tmp;  \	rm -f $(depfile);						  \	mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmdendef # Built-in and composite module parts %.o: %.c FORCE	$(call cmd,force_checksrc)	$(call if_changed_rule,cc_o_c) # Single-part modules are special since we need to mark them in $(MODVERDIR) $(single-used-m): %.o: %.c FORCE	$(call cmd,force_checksrc)	$(call if_changed_rule,cc_o_c)	@{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) quiet_cmd_cc_lst_c = MKLST   $@      cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \		     $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \				     System.map $(OBJDUMP) > $@ %.lst: %.c FORCE	$(call if_changed_dep,cc_lst_c) # Compile assembler sources (.S)# --------------------------------------------------------------------------- modkern_aflags := $(AFLAGS_KERNEL) $(real-objs-m)      : modkern_aflags := $(AFLAGS_MODULE)$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE) quiet_cmd_as_s_S = CPP $(quiet_modtag) $@cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $<  %.s: %.S FORCE	$(call if_changed_dep,as_s_S) quiet_cmd_as_o_S = AS $(quiet_modtag)  $@cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $< %.o: %.S FORCE	$(call if_changed_dep,as_o_S) targets += $(real-objs-y) $(real-objs-m) $(lib-y)targets += $(extra-y) $(MAKECMDGOALS) $(always) # Linker scripts preprocessor (.lds.S -> .lds)# ---------------------------------------------------------------------------quiet_cmd_cpp_lds_S = LDS     $@      cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $< %.lds: %.lds.S FORCE	$(call if_changed_dep,cpp_lds_S) # Build the compiled-in targets# --------------------------------------------------------------------------- # To build objects in subdirs, we need to descend into the directories$(sort $(subdir-obj-y)): $(subdir-ym) ; ## Rule to compile a set of .o files into one .o file#ifdef builtin-targetquiet_cmd_link_o_target = LD      $@# If the list of objects to link is empty, just create an empty built-in.ocmd_link_o_target = $(if $(strip $(obj-y)),\		      $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\		      rm -f $@; $(AR) rcs $@) $(builtin-target): $(obj-y) FORCE	$(call if_changed,link_o_target) targets += $(builtin-target)endif # builtin-target ## Rule to compile a set of .o files into one .a file#ifdef lib-targetquiet_cmd_link_l_target = AR      $@cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y) $(lib-target): $(lib-y) FORCE	$(call if_changed,link_l_target) targets += $(lib-target)endif ## Rule to link composite objects##  Composite objects are specified in kbuild makefile as follows:#    <composite-object>-objs := <list of .o files>#  or#    <composite-object>-y    := <list of .o files>link_multi_deps =                     \$(filter $(addprefix $(obj)/,         \$($(subst $(obj)/,,$(@:.o=-objs)))    \$($(subst $(obj)/,,$(@:.o=-y)))), $^) quiet_cmd_link_multi-y = LD      $@cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) quiet_cmd_link_multi-m = LD [M]  $@cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps) # We would rather have a list of rules like# 	foo.o: $(foo-objs)# but that's not so easy, so we rather make all composite objects depend# on the set of all their parts$(multi-used-y) : %.o: $(multi-objs-y) FORCE	$(call if_changed,link_multi-y) $(multi-used-m) : %.o: $(multi-objs-m) FORCE	$(call if_changed,link_multi-m)	@{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) targets += $(multi-used-y) $(multi-used-m)  # Descending# --------------------------------------------------------------------------- .PHONY: $(subdir-ym)$(subdir-ym):	$(Q)$(MAKE) $(build)=$@ # Add FORCE to the prequisites of a target to force it to be always rebuilt.# --------------------------------------------------------------------------- .PHONY: FORCE FORCE: # Read all saved command lines and dependencies for the $(targets) we# may be building above, using $(if_changed{,_dep}). As an# optimization, we don't need to read them if the target does not# exist, we will rebuild anyway in that case. targets := $(wildcard $(sort $(targets)))cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) ifneq ($(cmd_files),)  include $(cmd_files)endif