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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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src := $(srcroot)/$(obj)
PHONY := $(obj)/$(obj)/:
# 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 :=asflags-y :=ccflags-y :=rustflags-y :=cppflags-y :=ldflags-y :=
subdir-asflags-y :=subdir-ccflags-y :=
# Read auto.conf if it exists, otherwise ignore-include $(objtree)/include/config/auto.conf
include $(srctree)/scripts/Kbuild.includeinclude $(srctree)/scripts/Makefile.compilerinclude $(kbuild-file)include $(srctree)/scripts/Makefile.lib
# flags that take effect in current and sub directoriesKBUILD_AFLAGS += $(subdir-asflags-y)KBUILD_CFLAGS += $(subdir-ccflags-y)KBUILD_RUSTFLAGS += $(subdir-rustflags-y)
# Figure out what we need to build from the various variables# ===========================================================================
# When an object is listed to be built compiled-in and modular,# only build the compiled-in versionobj-m := $(filter-out $(obj-y),$(obj-m))
# Libraries are always collected in one lib file.# Filter out objects already built-inlib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
# Subdirectories we need to descend intosubdir-ym := $(sort $(subdir-y) $(subdir-m) \ $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))
# Handle objects in subdirs:# - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and# foo/modules.order# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order## Generate modules.order to determine modorder. Unfortunately, we don't have# information about ordering between -y and -m subdirs. Just put -y's first.
ifdef need-modorderobj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))elseobj-m := $(filter-out %/, $(obj-m))endif
ifdef need-builtinobj-y := $(patsubst %/, %/built-in.a, $(obj-y))elseobj-y := $(filter-out %/, $(obj-y))endif
# Expand $(foo-objs) $(foo-y) etc. by replacing their individualssuffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s))))# List composite targets that are constructed by combining other targetsmulti-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m)))# List primitive targets that are compiled from source filesreal-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m))
# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite objectmulti-obj-y := $(call multi-search, $(obj-y), .o, -objs -y)multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m)multi-obj-ym := $(multi-obj-y) $(multi-obj-m)
# Replace multi-part objects by their individual parts,# including built-in.a from subdirectoriesreal-obj-y := $(call real-search, $(obj-y), .o, -objs -y)real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m)
always-y += $(always-m)
# hostprogs-always-y += foo# ... is a shorthand for# hostprogs += foo# always-y += foohostprogs += $(hostprogs-always-y) $(hostprogs-always-m)always-y += $(hostprogs-always-y) $(hostprogs-always-m)
# userprogs-always-y is likewise.userprogs += $(userprogs-always-y) $(userprogs-always-m)always-y += $(userprogs-always-y) $(userprogs-always-m)
# Add subdir path
ifneq ($(obj),.)extra-y := $(addprefix $(obj)/, $(extra-y))always-y := $(addprefix $(obj)/, $(always-y))targets := $(addprefix $(obj)/, $(targets))obj-m := $(addprefix $(obj)/, $(obj-m))lib-y := $(addprefix $(obj)/, $(lib-y))real-obj-y := $(addprefix $(obj)/, $(real-obj-y))real-obj-m := $(addprefix $(obj)/, $(real-obj-m))multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m))subdir-ym := $(addprefix $(obj)/, $(subdir-ym))endif
ifndef obj$(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.)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 := $(foreach x, o mod, \ $(patsubst %.o, %.$x, $(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) $<endif
ifeq ($(KBUILD_EXTMOD),)ifneq ($(KBUILD_EXTRA_WARN),) cmd_checkdoc = PYTHONDONTWRITEBYTECODE=1 $(PYTHON3) $(KERNELDOC) -none $(KDOCFLAGS) \ $(if $(findstring 2, $(KBUILD_EXTRA_WARN)), -Wall) \ $<endifendif
# 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: $(obj)/%.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: $(obj)/%.c FORCE $(call if_changed_dep,cpp_i_c)
getexportsymbols = $(NM) $@ | sed -n 's/.* __export_symbol_\(.*\)/$(1)/p'
gendwarfksyms = $(objtree)/scripts/gendwarfksyms/gendwarfksyms \ $(if $(KBUILD_SYMTYPES), --symtypes $(@:.o=.symtypes)) \ $(if $(KBUILD_GENDWARFKSYMS_STABLE), --stable)
genksyms = $(objtree)/scripts/genksyms/genksyms \ $(if $(KBUILD_SYMTYPES), -T $(@:.o=.symtypes)) \ $(if $(KBUILD_PRESERVE), -p) \ $(addprefix -r , $(wildcard $(@:.o=.symref)))
# These mirror gensymtypes_S and co below, keep them in synch.ifdef CONFIG_GENDWARFKSYMScmd_gensymtypes_c = $(if $(skip_gendwarfksyms),, \ $(call getexportsymbols,\1) | $(gendwarfksyms) $@)elsecmd_gensymtypes_c = $(CPP) -D__GENKSYMS__ $(c_flags) $< | $(genksyms)endif # CONFIG_GENDWARFKSYMS
# LLVM assembly# Generate .ll files from .cquiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -fno-discard-value-names -o $@ $<
$(obj)/%.ll: $(obj)/%.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)
is-single-obj-m = $(and $(part-of-module),$(filter $@, $(obj-m)),y)
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 __export_symbol_*, 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 dump them into the .cmd file.# o modpost will extract versions from that file and create *.c files that will# be compiled and linked to the kernel and/or modules.
gen_symversions = \ if $(NM) $@ 2>/dev/null | grep -q ' __export_symbol_'; then \ $(cmd_gensymtypes_$1) >> $(dot-target).cmd; \ fi
cmd_gen_symversions_c = $(call gen_symversions,c)
endif
ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT# compiler will not generate __mcount_loc use recordmcount or recordmcount.plifdef BUILD_C_RECORDMCOUNTifeq ("$(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
# '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
is-standard-object = $(if $(filter-out y%, $(OBJECT_FILES_NON_STANDARD_$(target-stem).o)$(OBJECT_FILES_NON_STANDARD)n),$(is-kernel-object))
ifdef CONFIG_OBJTOOL$(obj)/%.o: private objtool-enabled = $(if $(is-standard-object),$(if $(delay-objtool),$(is-single-obj-m),y))endif
ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)cmd_warn_shared_object = $(if $(word 2, $(modname-multi)),$(warning $(kbuild-file): $*.o is added to multiple modules: $(modname-multi)))endif
# Built-in and composite module parts$(obj)/%.o: $(obj)/%.c $(recordmcount_source) FORCE $(call if_changed_rule,cc_o_c) $(call cmd,force_checksrc)
# To make this rule robust against "Argument list too long" error,# ensure to add $(obj)/ prefix by a shell command.cmd_mod = printf '%s\n' $(call real-search, $*.o, .o, -objs -y -m) | \ $(AWK) '!x[$$0]++ { print("$(obj)/"$$0) }' > $@
$(obj)/%.mod: 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: $(obj)/%.c FORCE $(call if_changed_dep,cc_lst_c)
# Compile Rust sources (.rs)# ---------------------------------------------------------------------------
# The features in this list are the ones allowed for non-`rust/` code.## - Stable since Rust 1.87.0: `feature(asm_goto)`.# - Stable since Rust 1.89.0: `feature(generic_arg_infer)`.# - Expected to become stable: `feature(arbitrary_self_types)`.# - To be determined: `feature(used_with_arg)`.## Please see https://github.com/Rust-for-Linux/linux/issues/2 for details on# the unstable features in use.rust_allowed_features := arbitrary_self_types,asm_goto,generic_arg_infer,used_with_arg
# `--out-dir` is required to avoid temporaries being created by `rustc` in the# current working directory, which may be not accessible in the out-of-tree# modules case.rust_common_cmd = \ OBJTREE=$(abspath $(objtree)) \ RUST_MODFILE=$(modfile) $(RUSTC_OR_CLIPPY) $(rust_flags) \ -Zallow-features=$(rust_allowed_features) \ -Zcrate-attr=no_std \ -Zcrate-attr='feature($(rust_allowed_features))' \ -Zunstable-options --extern pin_init --extern kernel \ --extern zerocopy --extern zerocopy_derive \ --crate-type rlib -L $(objtree)/rust/ \ --sysroot=/dev/null \ --out-dir $(dir $@) --emit=dep-info=$(depfile)
# `--emit=obj`, `--emit=asm` and `--emit=llvm-ir` imply a single codegen unit# will be used. We explicitly request `-Ccodegen-units=1` in any case, and# the compiler shows a warning if it is not 1. However, if we ever stop# requesting it explicitly and we start using some other `--emit` that does not# imply it (and for which codegen is performed), then we would be out of sync,# i.e. the outputs we would get for the different single targets (e.g. `.ll`)# would not match each other.
quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ cmd_rustc_o_rs = $(rust_common_cmd) --emit=$(if $(CONFIG_RUST_INLINE_HELPERS),llvm-bc=$(patsubst %.o,%.bc,$@),obj=$@) $< \ $(if $(CONFIG_RUST_INLINE_HELPERS),;$(LLVM_LINK) --internalize --suppress-warnings $(patsubst %.o,%.bc,$@) \ $(objtree)/rust/helpers/helpers$(if $(part-of-module),_module).bc -o $(patsubst %.o,%.m.bc,$@); \ $(CC) $(CLANG_FLAGS) $(KBUILD_CFLAGS) -Wno-override-module -c $(patsubst %.o,%.m.bc,$@) -o $@ \ $(cmd_ld_single)) \ $(cmd_objtool)
define rule_rustc_o_rs $(call cmd_and_fixdep,rustc_o_rs) $(call cmd,gen_objtooldep)endef
$(obj)/%.o: $(obj)/%.rs FORCE +$(call if_changed_rule,rustc_o_rs)
quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ cmd_rustc_rsi_rs = \ $(rust_common_cmd) -Zunpretty=expanded $< >$@; \ command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) --config-path $(srctree)/.rustfmt.toml $@
$(obj)/%.rsi: $(obj)/%.rs FORCE +$(call if_changed_dep,rustc_rsi_rs)
quiet_cmd_rustc_s_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ cmd_rustc_s_rs = $(rust_common_cmd) --emit=asm=$@ $<
$(obj)/%.s: $(obj)/%.rs FORCE +$(call if_changed_dep,rustc_s_rs)
quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ cmd_rustc_ll_rs = $(rust_common_cmd) --emit=llvm-ir=$@ $<
$(obj)/%.ll: $(obj)/%.rs FORCE +$(call if_changed_dep,rustc_ll_rs)
quiet_cmd_rustc_rs_rs_S = RSCPP $(quiet_modtag) $@ cmd_rustc_rs_rs_S = $(CPP) $(c_flags) -xc -C -P $< | sed '1,/^\/\/ Cut here.$$/d' >$@
$(obj)/%.rs: $(obj)/%.rs.S FORCE +$(call if_changed_dep,rustc_rs_rs_S)
# 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 or compiled into an object for gendwarfksyms.## These mirror gensymtypes_c and co above, keep them in synch.getasmexports = \ { echo "\#include <linux/kernel.h>" ; \ echo "\#include <linux/string.h>" ; \ echo "\#include <asm/asm-prototypes.h>" ; \ $(call getexportsymbols,EXPORT_SYMBOL(\1);) ; }
ifdef CONFIG_GENDWARFKSYMScmd_gensymtypes_S = \ $(getasmexports) | \ $(CC) $(c_flags) -c -o $(@:.o=.gendwarfksyms.o) -xc -; \ $(call getexportsymbols,\1) | \ $(gendwarfksyms) $(@:.o=.gendwarfksyms.o)elsecmd_gensymtypes_S = \ $(getasmexports) | \ $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)endif # CONFIG_GENDWARFKSYMS
quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
$(obj)/%.s: $(obj)/%.S FORCE $(call if_changed_dep,cpp_s_S)
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_gen_symversions_S = $(call gen_symversions,S)
endif
$(obj)/%.o: $(obj)/%.S 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 += $(lib-y) $(always-y)
# 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)/% ;
## Rule to compile a set of .o files into one .a file (without symbol table)## To make this rule robust against "Argument list too long" error,# remove $(obj)/ prefix, and restore it by a shell command.
quiet_cmd_ar_builtin = AR $@ cmd_ar_builtin = rm -f $@; \ $(if $(real-prereqs), printf "$(obj)/%s " $(patsubst $(obj)/%,%,$(real-prereqs)) | xargs) \ $(AR) cDPrST $@
$(obj)/built-in.a: $(real-obj-y) FORCE $(call if_changed,ar_builtin)
# This is a list of build artifacts from the current Makefile and its# sub-directories. The timestamp should be updated when any of the member files.
cmd_gen_order = { $(foreach m, $(real-prereqs), \ $(if $(filter %/$(notdir $@), $m), cat $m, echo $m);) :; } \ > $@
$(obj)/modules.order: $(obj-m) FORCE $(call if_changed,gen_order)
## Rule to compile a set of .o files into one .a file (with symbol table)#
$(obj)/lib.a: $(lib-y) FORCE $(call if_changed,ar)
quiet_cmd_ld_multi_m = LD [M] $@ cmd_ld_multi_m = $(LD) $(ld_flags) -r -o $@ @$< $(cmd_objtool)
define rule_ld_multi_m $(call cmd_and_savecmd,ld_multi_m) $(call cmd,gen_objtooldep)endef
$(multi-obj-m): private objtool-enabled := $(delay-objtool)$(multi-obj-m): private part-of-module := y$(multi-obj-m): %.o: %.mod FORCE $(call if_changed_rule,ld_multi_m)$(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
# 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] <- %.asn1targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h)
# Include additional build rules when necessary# ---------------------------------------------------------------------------
# $(sort ...) is used here to remove duplicated words and excessive spaces.hostprogs := $(sort $(hostprogs))ifneq ($(hostprogs),)include $(srctree)/scripts/Makefile.hostendif
# $(sort ...) is used here to remove duplicated words and excessive spaces.userprogs := $(sort $(userprogs))ifneq ($(userprogs),)include $(srctree)/scripts/Makefile.userprogsendif
# Single targets# ---------------------------------------------------------------------------
single-subdirs := $(foreach d, $(subdir-ym), $(if $(filter $d/%, $(MAKECMDGOALS)), $d))single-subdir-goals := $(filter $(addsuffix /%, $(single-subdirs)), $(MAKECMDGOALS))
$(single-subdir-goals): $(single-subdirs) @:
# Descending# ---------------------------------------------------------------------------
PHONY += $(subdir-ym)$(subdir-ym): $(Q)$(MAKE) $(build)=$@ \ need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \ need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1) \ $(filter $@/%, $(single-subdir-goals))
# Add FORCE to the prerequisites of a target to force it to be always rebuilt.# ---------------------------------------------------------------------------
PHONY += FORCE
FORCE:
targets += $(filter-out $(single-subdir-goals), $(MAKECMDGOALS))targets := $(filter-out $(PHONY), $(targets))
# Now that targets is fully known, include dtb rules if neededifneq ($(need-dtbslist)$(dtb-y)$(dtb-)$(filter %.dtb %.dtb.o %.dtbo.o,$(targets)),)include $(srctree)/scripts/Makefile.dtbsendif
# Build# Needs to be after the include of Makefile.dtbs, which updates always-y# ---------------------------------------------------------------------------
$(obj)/: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \ $(if $(KBUILD_MODULES), $(targets-for-modules)) \ $(subdir-ym) $(always-y) @:
# 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.
existing-targets := $(wildcard $(sort $(targets)))
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
# Create directories for object files if they do not existobj-dirs := $(sort $(patsubst %/,%, $(dir $(targets))))# If targets exist, their directories apparently exist. Skip mkdir.existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))ifneq ($(obj-dirs),)$(shell mkdir -p $(obj-dirs))endif
.PHONY: $(PHONY)