# SPDX-License-Identifier: GPL-2.0# ==========================================================================# Building# ========================================================================== src := $(obj) PHONY := __build__build: # Init all relevant variables used in kbuild files so# 1) they have correct type# 2) they do not inherit any value from the environmentobj-y :=obj-m :=lib-y :=lib-m :=always-y :=always-m :=targets :=subdir-y :=subdir-m :=EXTRA_AFLAGS :=EXTRA_CFLAGS :=EXTRA_CPPFLAGS :=EXTRA_LDFLAGS :=asflags-y :=ccflags-y :=cppflags-y :=ldflags-y := subdir-asflags-y :=subdir-ccflags-y := # Read auto.conf if it exists, otherwise ignore-include include/config/auto.conf include $(srctree)/scripts/Kbuild.includeinclude $(srctree)/scripts/Makefile.compiler # The filename Kbuild has precedence over Makefilekbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)include $(kbuild-file) include $(srctree)/scripts/Makefile.lib # Do not include hostprogs rules unless needed.# $(sort ...) is used here to remove duplicated words and excessive spaces.hostprogs := $(sort $(hostprogs))ifneq ($(hostprogs),)include $(srctree)/scripts/Makefile.hostendif # Do not include userprogs rules unless needed.# $(sort ...) is used here to remove duplicated words and excessive spaces.userprogs := $(sort $(userprogs))ifneq ($(userprogs),)include $(srctree)/scripts/Makefile.userprogsendif ifndef obj$(warning kbuild: Makefile.build is included improperly)endif ifeq ($(need-modorder),)ifneq ($(obj-m),)$(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)$(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)endifendif # =========================================================================== # subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...)subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y)))subdir-modorder := $(sort $(filter %/modules.order, $(obj-m))) targets-for-builtin := $(extra-y) ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)targets-for-builtin += $(obj)/lib.aendif ifdef need-builtintargets-for-builtin += $(obj)/built-in.aendif targets-for-modules := $(patsubst %.o, %.mod, $(filter %.o, $(obj-m))) ifdef need-modordertargets-for-modules += $(obj)/modules.orderendif targets += $(targets-for-builtin) $(targets-for-modules) # Linus' kernel sanity checking toolifeq ($(KBUILD_CHECKSRC),1) quiet_cmd_checksrc = CHECK $< cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<else ifeq ($(KBUILD_CHECKSRC),2) quiet_cmd_force_checksrc = CHECK $< cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<endif ifneq ($(KBUILD_EXTRA_WARN),) cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<endif # Compile C sources (.c)# --------------------------------------------------------------------------- quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $< $(obj)/%.s: $(src)/%.c FORCE $(call if_changed_dep,cc_s_c) quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< $(obj)/%.i: $(src)/%.c FORCE $(call if_changed_dep,cpp_i_c) # These mirror gensymtypes_S and co below, keep them in synch.cmd_gensymtypes_c = \ $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ scripts/genksyms/genksyms $(if $(1), -T $(2)) \ $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ $(if $(KBUILD_PRESERVE),-p) \ -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@cmd_cc_symtypes_c = \ $(call cmd_gensymtypes_c,true,$@) >/dev/null; \ test -s $@ || rm -f $@ $(obj)/%.symtypes : $(src)/%.c FORCE $(call cmd,cc_symtypes_c) # LLVM assembly# Generate .ll files from .cquiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< $(obj)/%.ll: $(src)/%.c FORCE $(call if_changed_dep,cc_ll_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) $@ cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< ifdef CONFIG_MODVERSIONS# When module versioning is enabled the following steps are executed:# o compile a <file>.o from <file>.c# o if <file>.o doesn't contain a __ksymtab version, i.e. does# not export symbols, it's 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 .tmp_<file>.o from <file>.o using the linker to# replace the unresolved symbols __crc_exported_symbol with# the actual value of the checksum generated by genksyms# o remove .tmp_<file>.o to <file>.o ifdef CONFIG_LTO_CLANG# Generate .o.symversions files for each .o with exported symbols, and link these# to the kernel and/or modules at the end.cmd_modversions_c = \ if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \ $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ > $@.symversions; \ fi;elsecmd_modversions_c = \ if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \ $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ > $(@D)/.tmp_$(@F:.o=.ver); \ \ $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \ -T $(@D)/.tmp_$(@F:.o=.ver); \ mv -f $(@D)/.tmp_$(@F) $@; \ rm -f $(@D)/.tmp_$(@F:.o=.ver); \ fiendifendif ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT# compiler will not generate __mcount_loc use recordmcount or recordmcount.plifdef BUILD_C_RECORDMCOUNTifeq ("$(origin RECORDMCOUNT_WARN)", "command line") RECORDMCOUNT_FLAGS = -wendif# Due to recursion, we must skip empty.o.# The empty.o file is created in the make process in order to determine# the target endianness and word size. It is made before all other C# files, including recordmcount.sub_cmd_record_mcount = \ if [ $(@) != "scripts/mod/empty.o" ]; then \ $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ fi;recordmcount_source := $(srctree)/scripts/recordmcount.c \ $(srctree)/scripts/recordmcount.helsesub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ "$(if $(CONFIG_64BIT),64,32)" \ "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \ "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \ "$(if $(part-of-module),1,0)" "$(@)";recordmcount_source := $(srctree)/scripts/recordmcount.plendif # BUILD_C_RECORDMCOUNTcmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \ $(sub_cmd_record_mcount))endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT ifdef CONFIG_STACK_VALIDATIONifndef CONFIG_LTO_CLANGifneq ($(SKIP_STACK_VALIDATION),1) __objtool_obj := $(objtree)/tools/objtool/objtool # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a filecmd_objtool = $(if $(patsubst y%,, \ $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ $(__objtool_obj) $(objtool_args) $@)objtool_obj = $(if $(patsubst y%,, \ $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ $(__objtool_obj)) endif # SKIP_STACK_VALIDATIONendif # CONFIG_LTO_CLANGendif # CONFIG_STACK_VALIDATION # Rebuild all objects when objtool changes, or is enabled/disabled.objtool_dep = $(objtool_obj) \ $(wildcard include/config/ORC_UNWINDER \ include/config/STACK_VALIDATION) ifdef CONFIG_TRIM_UNUSED_KSYMScmd_gen_ksymdeps = \ $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd # List module undefined symbolsundefined_syms = $(NM) $< | $(AWK) '$$1 == "U" { printf("%s%s", x++ ? " " : "", $$2) }';endif define rule_cc_o_c $(call cmd_and_fixdep,cc_o_c) $(call cmd,gen_ksymdeps) $(call cmd,checksrc) $(call cmd,checkdoc) $(call cmd,objtool) $(call cmd,modversions_c) $(call cmd,record_mcount)endef define rule_as_o_S $(call cmd_and_fixdep,as_o_S) $(call cmd,gen_ksymdeps) $(call cmd,objtool) $(call cmd,modversions_S)endef # Built-in and composite module parts$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE $(call if_changed_rule,cc_o_c) $(call cmd,force_checksrc) cmd_mod = { \ echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \ $(undefined_syms) echo; \ } > $@ $(obj)/%.mod: $(obj)/%.o FORCE $(call if_changed,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) > $@ $(obj)/%.lst: $(src)/%.c FORCE $(call if_changed_dep,cc_lst_c) # Compile assembler sources (.S)# --------------------------------------------------------------------------- # .S file exports must have their C prototypes defined in asm/asm-prototypes.h# or a file that it includes, in order to get versioned symbols. We build a# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from# the .S file (with trailing ';'), and run genksyms on that, to extract vers.## This is convoluted. The .S file must first be preprocessed to run guards and# expand names, then the resulting exports must be constructed into plain# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed# to make the genksyms input.## These mirror gensymtypes_c and co above, keep them in synch.cmd_gensymtypes_S = \ { echo "\#include <linux/kernel.h>" ; \ echo "\#include <asm/asm-prototypes.h>" ; \ $(CPP) $(a_flags) $< | \ grep "\<___EXPORT_SYMBOL\>" | \ sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \ $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \ scripts/genksyms/genksyms $(if $(1), -T $(2)) \ $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ $(if $(KBUILD_PRESERVE),-p) \ -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@cmd_cc_symtypes_S = \ $(call cmd_gensymtypes_S,true,$@) >/dev/null; \ test -s $@ || rm -f $@ $(obj)/%.symtypes : $(src)/%.S FORCE $(call cmd,cc_symtypes_S) quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< $(obj)/%.s: $(src)/%.S FORCE $(call if_changed_dep,cpp_s_S) quiet_cmd_as_o_S = AS $(quiet_modtag) $@ cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< ifdef CONFIG_ASM_MODVERSIONS # versioning matches the C process described above, with difference that# we parse asm-prototypes.h C header to get function definitions. cmd_modversions_S = \ if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \ $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ > $(@D)/.tmp_$(@F:.o=.ver); \ \ $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \ -T $(@D)/.tmp_$(@F:.o=.ver); \ mv -f $(@D)/.tmp_$(@F) $@; \ rm -f $(@D)/.tmp_$(@F:.o=.ver); \ fiendif $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE $(call if_changed_rule,as_o_S) targets += $(filter-out $(subdir-builtin), $(real-obj-y))targets += $(filter-out $(subdir-modorder), $(real-obj-m))targets += $(real-dtb-y) $(lib-y) $(always-y) $(MAKECMDGOALS) # Linker scripts preprocessor (.lds.S -> .lds)# ---------------------------------------------------------------------------quiet_cmd_cpp_lds_S = LDS $@ cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< $(obj)/%.lds: $(src)/%.lds.S FORCE $(call if_changed_dep,cpp_lds_S) # ASN.1 grammar# ---------------------------------------------------------------------------quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch] cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ $(basename $@).c $(basename $@).h $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler $(call cmd,asn1_compiler) # Build the compiled-in targets# --------------------------------------------------------------------------- # To build objects in subdirs, we need to descend into the directories$(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ;$(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ; # combine symversions for later processingquiet_cmd_update_lto_symversions = SYMVER $@ifeq ($(CONFIG_LTO_CLANG) $(CONFIG_MODVERSIONS),y y) cmd_update_lto_symversions = \ rm -f $@.symversions \ $(foreach n, $(filter-out FORCE,$^), \ $(if $(wildcard $(n).symversions), \ ; cat $(n).symversions >> $@.symversions))else cmd_update_lto_symversions = echo >/dev/nullendif ## Rule to compile a set of .o files into one .a file (without symbol table)# quiet_cmd_ar_builtin = AR $@ cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs) quiet_cmd_ar_and_symver = AR $@ cmd_ar_and_symver = $(cmd_update_lto_symversions); $(cmd_ar_builtin) $(obj)/built-in.a: $(real-obj-y) FORCE $(call if_changed,ar_and_symver) ## Rule to create modules.order file## Create commands to either record .ko file or cat modules.order from# a subdirectory# Add $(obj-m) as the prerequisite to avoid updating the timestamp of# modules.order unless contained modules are updated. cmd_modules_order = { $(foreach m, $(real-prereqs), \ $(if $(filter %/modules.order, $m), cat $m, echo $(patsubst %.o,%.ko,$m));) :; } \ | $(AWK) '!x[$$0]++' - > $@ $(obj)/modules.order: $(obj-m) FORCE $(call if_changed,modules_order) ## Rule to compile a set of .o files into one .a file (with symbol table)#quiet_cmd_ar_lib = AR $@ cmd_ar_lib = $(cmd_update_lto_symversions); $(cmd_ar) $(obj)/lib.a: $(lib-y) FORCE $(call if_changed,ar_lib) # NOTE:# Do not replace $(filter %.o,^) with $(real-prereqs). When a single object# module is turned into a multi object module, $^ will contain header file# dependencies recorded in the .*.cmd file.ifdef CONFIG_LTO_CLANGquiet_cmd_link_multi-m = AR [M] $@cmd_link_multi-m = \ $(cmd_update_lto_symversions); \ rm -f $@; \ $(AR) cDPrsT $@ $(filter %.o,$^)elsequiet_cmd_link_multi-m = LD [M] $@ cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^)endif $(multi-obj-m): FORCE $(call if_changed,link_multi-m)$(call multi_depend, $(multi-obj-m), .o, -objs -y -m) targets += $(multi-obj-m)targets := $(filter-out $(PHONY), $(targets)) # Add intermediate targets:# When building objects with specific suffix patterns, add intermediate# targets that the final targets are derived from.intermediate_targets = $(foreach sfx, $(2), \ $(patsubst %$(strip $(1)),%$(sfx), \ $(filter %$(strip $(1)), $(targets))))# %.asn1.o <- %.asn1.[ch] <- %.asn1# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts# %.lex.o <- %.lex.c <- %.l# %.tab.o <- %.tab.[ch] <- %.ytargets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \ $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \ $(call intermediate_targets, .lex.o, .lex.c) \ $(call intermediate_targets, .tab.o, .tab.c .tab.h) # Build# --------------------------------------------------------------------------- ifdef single-build KBUILD_SINGLE_TARGETS := $(filter $(obj)/%, $(KBUILD_SINGLE_TARGETS)) curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \ $(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x)))) # Handle single targets without any rule: show "Nothing to be done for ..." or# "No rule to make target ..." depending on whether the target exists.unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \ $(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS))) single-subdirs := $(foreach d, $(subdir-ym), \ $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) __build: $(curdir-single) $(single-subdirs)ifneq ($(unknown-single),) $(Q)$(MAKE) -f /dev/null $(unknown-single)endif @: ifeq ($(curdir-single),)# Nothing to do in this directory. Do not include any .*.cmd file for speed-uptargets :=elsetargets += $(curdir-single)endif Lines 1–500 of 545. Load more
# SPDX-License-Identifier: GPL-2.0 # ========================================================================== # Building # ========================================================================== src := $(obj) PHONY := __build __build: # Init all relevant variables used in kbuild files so # 1) they have correct type # 2) they do not inherit any value from the environment obj-y := obj-m := lib-y := lib-m := always-y := always-m := targets := subdir-y := subdir-m := EXTRA_AFLAGS := EXTRA_CFLAGS := EXTRA_CPPFLAGS := EXTRA_LDFLAGS := asflags-y := ccflags-y := cppflags-y := ldflags-y := subdir-asflags-y := subdir-ccflags-y := # Read auto.conf if it exists, otherwise ignore -include include/config/auto.conf include $(srctree)/scripts/Kbuild.include include $(srctree)/scripts/Makefile.compiler # The filename Kbuild has precedence over Makefile kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) include $(kbuild-file) include $(srctree)/scripts/Makefile.lib # Do not include hostprogs rules unless needed. # $(sort ...) is used here to remove duplicated words and excessive spaces. hostprogs := $(sort $(hostprogs)) ifneq ($(hostprogs),) include $(srctree)/scripts/Makefile.host endif # Do not include userprogs rules unless needed. # $(sort ...) is used here to remove duplicated words and excessive spaces. userprogs := $(sort $(userprogs)) ifneq ($(userprogs),) include $(srctree)/scripts/Makefile.userprogs endif ifndef obj $(warning kbuild: Makefile.build is included improperly) endif ifeq ($(need-modorder),) ifneq ($(obj-m),) $(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.) $(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.) endif endif # =========================================================================== # subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...) subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y))) subdir-modorder := $(sort $(filter %/modules.order, $(obj-m))) targets-for-builtin := $(extra-y) ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) targets-for-builtin += $(obj)/lib.a endif ifdef need-builtin targets-for-builtin += $(obj)/built-in.a endif targets-for-modules := $(patsubst %.o, %.mod, $(filter %.o, $(obj-m))) ifdef need-modorder targets-for-modules += $(obj)/modules.order endif targets += $(targets-for-builtin) $(targets-for-modules) # Linus' kernel sanity checking tool ifeq ($(KBUILD_CHECKSRC),1) quiet_cmd_checksrc = CHECK $< cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< else ifeq ($(KBUILD_CHECKSRC),2) quiet_cmd_force_checksrc = CHECK $< cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< endif ifneq ($(KBUILD_EXTRA_WARN),) cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< endif # Compile C sources (.c) # --------------------------------------------------------------------------- quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $< $(obj)/%.s: $(src)/%.c FORCE $(call if_changed_dep,cc_s_c) quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< $(obj)/%.i: $(src)/%.c FORCE $(call if_changed_dep,cpp_i_c) # These mirror gensymtypes_S and co below, keep them in synch. cmd_gensymtypes_c = \ $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ scripts/genksyms/genksyms $(if $(1), -T $(2)) \ $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ $(if $(KBUILD_PRESERVE),-p) \ -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ cmd_cc_symtypes_c = \ $(call cmd_gensymtypes_c,true,$@) >/dev/null; \ test -s $@ || rm -f $@ $(obj)/%.symtypes : $(src)/%.c FORCE $(call cmd,cc_symtypes_c) # LLVM assembly # Generate .ll files from .c quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< $(obj)/%.ll: $(src)/%.c FORCE $(call if_changed_dep,cc_ll_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) $@ cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< ifdef CONFIG_MODVERSIONS # When module versioning is enabled the following steps are executed: # o compile a <file>.o from <file>.c # o if <file>.o doesn't contain a __ksymtab version, i.e. does # not export symbols, it's 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 .tmp_<file>.o from <file>.o using the linker to # replace the unresolved symbols __crc_exported_symbol with # the actual value of the checksum generated by genksyms # o remove .tmp_<file>.o to <file>.o ifdef CONFIG_LTO_CLANG # Generate .o.symversions files for each .o with exported symbols, and link these # to the kernel and/or modules at the end. cmd_modversions_c = \ if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \ $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ > $@.symversions; \ fi; else cmd_modversions_c = \ if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \ $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ > $(@D)/.tmp_$(@F:.o=.ver); \ \ $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \ -T $(@D)/.tmp_$(@F:.o=.ver); \ mv -f $(@D)/.tmp_$(@F) $@; \ rm -f $(@D)/.tmp_$(@F:.o=.ver); \ fi endif endif ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT # compiler will not generate __mcount_loc use recordmcount or recordmcount.pl ifdef BUILD_C_RECORDMCOUNT ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") RECORDMCOUNT_FLAGS = -w endif # Due to recursion, we must skip empty.o. # The empty.o file is created in the make process in order to determine # the target endianness and word size. It is made before all other C # files, including recordmcount. sub_cmd_record_mcount = \ if [ $(@) != "scripts/mod/empty.o" ]; then \ $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ fi; recordmcount_source := $(srctree)/scripts/recordmcount.c \ $(srctree)/scripts/recordmcount.h else sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ "$(if $(CONFIG_64BIT),64,32)" \ "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \ "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \ "$(if $(part-of-module),1,0)" "$(@)"; recordmcount_source := $(srctree)/scripts/recordmcount.pl endif # BUILD_C_RECORDMCOUNT cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \ $(sub_cmd_record_mcount)) endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT ifdef CONFIG_STACK_VALIDATION ifndef CONFIG_LTO_CLANG ifneq ($(SKIP_STACK_VALIDATION),1) __objtool_obj := $(objtree)/tools/objtool/objtool # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file cmd_objtool = $(if $(patsubst y%,, \ $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ $(__objtool_obj) $(objtool_args) $@) objtool_obj = $(if $(patsubst y%,, \ $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ $(__objtool_obj)) endif # SKIP_STACK_VALIDATION endif # CONFIG_LTO_CLANG endif # CONFIG_STACK_VALIDATION # Rebuild all objects when objtool changes, or is enabled/disabled. objtool_dep = $(objtool_obj) \ $(wildcard include/config/ORC_UNWINDER \ include/config/STACK_VALIDATION) ifdef CONFIG_TRIM_UNUSED_KSYMS cmd_gen_ksymdeps = \ $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd # List module undefined symbols undefined_syms = $(NM) $< | $(AWK) '$$1 == "U" { printf("%s%s", x++ ? " " : "", $$2) }'; endif define rule_cc_o_c $(call cmd_and_fixdep,cc_o_c) $(call cmd,gen_ksymdeps) $(call cmd,checksrc) $(call cmd,checkdoc) $(call cmd,objtool) $(call cmd,modversions_c) $(call cmd,record_mcount) endef define rule_as_o_S $(call cmd_and_fixdep,as_o_S) $(call cmd,gen_ksymdeps) $(call cmd,objtool) $(call cmd,modversions_S) endef # Built-in and composite module parts $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE $(call if_changed_rule,cc_o_c) $(call cmd,force_checksrc) cmd_mod = { \ echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \ $(undefined_syms) echo; \ } > $@ $(obj)/%.mod: $(obj)/%.o FORCE $(call if_changed,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) > $@ $(obj)/%.lst: $(src)/%.c FORCE $(call if_changed_dep,cc_lst_c) # Compile assembler sources (.S) # --------------------------------------------------------------------------- # .S file exports must have their C prototypes defined in asm/asm-prototypes.h # or a file that it includes, in order to get versioned symbols. We build a # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from # the .S file (with trailing ';'), and run genksyms on that, to extract vers. # # This is convoluted. The .S file must first be preprocessed to run guards and # expand names, then the resulting exports must be constructed into plain # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed # to make the genksyms input. # # These mirror gensymtypes_c and co above, keep them in synch. cmd_gensymtypes_S = \ { echo "\#include <linux/kernel.h>" ; \ echo "\#include <asm/asm-prototypes.h>" ; \ $(CPP) $(a_flags) $< | \ grep "\<___EXPORT_SYMBOL\>" | \ sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \ $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \ scripts/genksyms/genksyms $(if $(1), -T $(2)) \ $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ $(if $(KBUILD_PRESERVE),-p) \ -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ cmd_cc_symtypes_S = \ $(call cmd_gensymtypes_S,true,$@) >/dev/null; \ test -s $@ || rm -f $@ $(obj)/%.symtypes : $(src)/%.S FORCE $(call cmd,cc_symtypes_S) quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< $(obj)/%.s: $(src)/%.S FORCE $(call if_changed_dep,cpp_s_S) quiet_cmd_as_o_S = AS $(quiet_modtag) $@ cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< ifdef CONFIG_ASM_MODVERSIONS # versioning matches the C process described above, with difference that # we parse asm-prototypes.h C header to get function definitions. cmd_modversions_S = \ if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \ $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ > $(@D)/.tmp_$(@F:.o=.ver); \ \ $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \ -T $(@D)/.tmp_$(@F:.o=.ver); \ mv -f $(@D)/.tmp_$(@F) $@; \ rm -f $(@D)/.tmp_$(@F:.o=.ver); \ fi endif $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE $(call if_changed_rule,as_o_S) targets += $(filter-out $(subdir-builtin), $(real-obj-y)) targets += $(filter-out $(subdir-modorder), $(real-obj-m)) targets += $(real-dtb-y) $(lib-y) $(always-y) $(MAKECMDGOALS) # Linker scripts preprocessor (.lds.S -> .lds) # --------------------------------------------------------------------------- quiet_cmd_cpp_lds_S = LDS $@ cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< $(obj)/%.lds: $(src)/%.lds.S FORCE $(call if_changed_dep,cpp_lds_S) # ASN.1 grammar # --------------------------------------------------------------------------- quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch] cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ $(basename $@).c $(basename $@).h $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler $(call cmd,asn1_compiler) # Build the compiled-in targets # --------------------------------------------------------------------------- # To build objects in subdirs, we need to descend into the directories $(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ; $(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ; # combine symversions for later processing quiet_cmd_update_lto_symversions = SYMVER $@ ifeq ($(CONFIG_LTO_CLANG) $(CONFIG_MODVERSIONS),y y) cmd_update_lto_symversions = \ rm -f $@.symversions \ $(foreach n, $(filter-out FORCE,$^), \ $(if $(wildcard $(n).symversions), \ ; cat $(n).symversions >> $@.symversions)) else cmd_update_lto_symversions = echo >/dev/null endif # # Rule to compile a set of .o files into one .a file (without symbol table) # quiet_cmd_ar_builtin = AR $@ cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs) quiet_cmd_ar_and_symver = AR $@ cmd_ar_and_symver = $(cmd_update_lto_symversions); $(cmd_ar_builtin) $(obj)/built-in.a: $(real-obj-y) FORCE $(call if_changed,ar_and_symver) # # Rule to create modules.order file # # Create commands to either record .ko file or cat modules.order from # a subdirectory # Add $(obj-m) as the prerequisite to avoid updating the timestamp of # modules.order unless contained modules are updated. cmd_modules_order = { $(foreach m, $(real-prereqs), \ $(if $(filter %/modules.order, $m), cat $m, echo $(patsubst %.o,%.ko,$m));) :; } \ | $(AWK) '!x[$$0]++' - > $@ $(obj)/modules.order: $(obj-m) FORCE $(call if_changed,modules_order) # # Rule to compile a set of .o files into one .a file (with symbol table) # quiet_cmd_ar_lib = AR $@ cmd_ar_lib = $(cmd_update_lto_symversions); $(cmd_ar) $(obj)/lib.a: $(lib-y) FORCE $(call if_changed,ar_lib) # NOTE: # Do not replace $(filter %.o,^) with $(real-prereqs). When a single object # module is turned into a multi object module, $^ will contain header file # dependencies recorded in the .*.cmd file. ifdef CONFIG_LTO_CLANG quiet_cmd_link_multi-m = AR [M] $@ cmd_link_multi-m = \ $(cmd_update_lto_symversions); \ rm -f $@; \ $(AR) cDPrsT $@ $(filter %.o,$^) else quiet_cmd_link_multi-m = LD [M] $@ cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^) endif $(multi-obj-m): FORCE $(call if_changed,link_multi-m) $(call multi_depend, $(multi-obj-m), .o, -objs -y -m) targets += $(multi-obj-m) targets := $(filter-out $(PHONY), $(targets)) # Add intermediate targets: # When building objects with specific suffix patterns, add intermediate # targets that the final targets are derived from. intermediate_targets = $(foreach sfx, $(2), \ $(patsubst %$(strip $(1)),%$(sfx), \ $(filter %$(strip $(1)), $(targets)))) # %.asn1.o <- %.asn1.[ch] <- %.asn1 # %.dtb.o <- %.dtb.S <- %.dtb <- %.dts # %.lex.o <- %.lex.c <- %.l # %.tab.o <- %.tab.[ch] <- %.y targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \ $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \ $(call intermediate_targets, .lex.o, .lex.c) \ $(call intermediate_targets, .tab.o, .tab.c .tab.h) # Build # --------------------------------------------------------------------------- ifdef single-build KBUILD_SINGLE_TARGETS := $(filter $(obj)/%, $(KBUILD_SINGLE_TARGETS)) curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \ $(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x)))) # Handle single targets without any rule: show "Nothing to be done for ..." or # "No rule to make target ..." depending on whether the target exists. unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \ $(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS))) single-subdirs := $(foreach d, $(subdir-ym), \ $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) __build: $(curdir-single) $(single-subdirs) ifneq ($(unknown-single),) $(Q)$(MAKE) -f /dev/null $(unknown-single) endif @: ifeq ($(curdir-single),) # Nothing to do in this directory. Do not include any .*.cmd file for speed-up targets := else targets += $(curdir-single) endif