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