1 # SPDX-License-Identifier: GPL-2.0
2 # ==========================================================================
4 # ==========================================================================
11 # Init all relevant variables used in kbuild files so
12 # 1) they have correct type
13 # 2) they do not inherit any value from the environment
34 # Read auto.conf if it exists, otherwise ignore
35 -include include/config/auto.conf
37 include scripts/Kbuild.include
39 # For backward compatibility check that these variables do not change
40 save-cflags := $(CFLAGS)
42 # The filename Kbuild has precedence over Makefile
43 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
44 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
45 include $(kbuild-file)
47 # If the save-* variables changed error out
48 ifeq ($(KBUILD_NOPEDANTIC),)
49 ifneq ("$(save-cflags)","$(CFLAGS)")
50 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
54 include scripts/Makefile.lib
57 ifneq ($(hostprogs-y),$(host-progs))
58 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
59 hostprogs-y += $(host-progs)
63 # Do not include host rules unless needed
64 ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
65 include scripts/Makefile.host
69 $(warning kbuild: Makefile.build is included improperly)
72 # ===========================================================================
74 ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
75 lib-target := $(obj)/lib.a
76 obj-y += $(obj)/lib-ksyms.o
79 ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
80 builtin-target := $(obj)/built-in.o
83 modorder-target := $(obj)/modules.order
85 # We keep a list of all modules in $(MODVERDIR)
87 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
88 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
89 $(subdir-ym) $(always)
92 # Linus' kernel sanity checking tool
93 ifneq ($(KBUILD_CHECKSRC),0)
94 ifeq ($(KBUILD_CHECKSRC),2)
95 quiet_cmd_force_checksrc = CHECK $<
96 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
98 quiet_cmd_checksrc = CHECK $<
99 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
103 # Do section mismatch analysis for each module/built-in.o
104 ifdef CONFIG_DEBUG_SECTION_MISMATCH
105 cmd_secanalysis = ; scripts/mod/modpost $@
108 # Compile C sources (.c)
109 # ---------------------------------------------------------------------------
111 # Default is built-in, unless we know otherwise
113 $(if $(part-of-module), \
114 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
115 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
116 quiet_modtag := $(empty) $(empty)
118 $(real-objs-m) : part-of-module := y
119 $(real-objs-m:.o=.i) : part-of-module := y
120 $(real-objs-m:.o=.s) : part-of-module := y
121 $(real-objs-m:.o=.lst): part-of-module := y
123 $(real-objs-m) : quiet_modtag := [M]
124 $(real-objs-m:.o=.i) : quiet_modtag := [M]
125 $(real-objs-m:.o=.s) : quiet_modtag := [M]
126 $(real-objs-m:.o=.lst): quiet_modtag := [M]
128 $(obj-m) : quiet_modtag := [M]
130 # Default for not multi-part modules
131 modname = $(basetarget)
133 $(multi-objs-m) : modname = $(modname-multi)
134 $(multi-objs-m:.o=.i) : modname = $(modname-multi)
135 $(multi-objs-m:.o=.s) : modname = $(modname-multi)
136 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
137 $(multi-objs-y) : modname = $(modname-multi)
138 $(multi-objs-y:.o=.i) : modname = $(modname-multi)
139 $(multi-objs-y:.o=.s) : modname = $(modname-multi)
140 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
142 quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
143 cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
145 $(obj)/%.s: $(src)/%.c FORCE
146 $(call if_changed_dep,cc_s_c)
148 quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
149 cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
151 $(obj)/%.i: $(src)/%.c FORCE
152 $(call if_changed_dep,cpp_i_c)
154 # These mirror gensymtypes_S and co below, keep them in synch.
155 cmd_gensymtypes_c = \
156 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
157 $(GENKSYMS) $(if $(1), -T $(2)) \
158 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
159 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
160 $(if $(KBUILD_PRESERVE),-p) \
161 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
163 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
164 cmd_cc_symtypes_c = \
166 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
167 test -s $@ || rm -f $@
169 $(obj)/%.symtypes : $(src)/%.c FORCE
170 $(call cmd,cc_symtypes_c)
173 # Generate .ll files from .c
174 quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
175 cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
177 $(obj)/%.ll: $(src)/%.c FORCE
178 $(call if_changed_dep,cc_ll_c)
181 # The C file is compiled and updated dependency information is generated.
182 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
184 quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
186 ifndef CONFIG_MODVERSIONS
187 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
190 # When module versioning is enabled the following steps are executed:
191 # o compile a .tmp_<file>.o from <file>.c
192 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
193 # not export symbols, we just rename .tmp_<file>.o to <file>.o and
195 # o otherwise, we calculate symbol versions using the good old
196 # genksyms on the preprocessed source and postprocess them in a way
197 # that they are usable as a linker script
198 # o generate <file>.o from .tmp_<file>.o using the linker to
199 # replace the unresolved symbols __crc_exported_symbol with
200 # the actual value of the checksum generated by genksyms
202 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
204 cmd_modversions_c = \
205 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
206 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
207 > $(@D)/.tmp_$(@F:.o=.ver); \
209 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
210 -T $(@D)/.tmp_$(@F:.o=.ver); \
211 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
213 mv -f $(@D)/.tmp_$(@F) $@; \
217 ifdef CONFIG_FTRACE_MCOUNT_RECORD
218 ifdef BUILD_C_RECORDMCOUNT
219 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
220 RECORDMCOUNT_FLAGS = -w
222 # Due to recursion, we must skip empty.o.
223 # The empty.o file is created in the make process in order to determine
224 # the target endianness and word size. It is made before all other C
225 # files, including recordmcount.
226 sub_cmd_record_mcount = \
227 if [ $(@) != "scripts/mod/empty.o" ]; then \
228 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
230 recordmcount_source := $(srctree)/scripts/recordmcount.c \
231 $(srctree)/scripts/recordmcount.h
233 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
234 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
235 "$(if $(CONFIG_64BIT),64,32)" \
236 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
237 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
238 "$(if $(part-of-module),1,0)" "$(@)";
239 recordmcount_source := $(srctree)/scripts/recordmcount.pl
240 endif # BUILD_C_RECORDMCOUNT
241 cmd_record_mcount = \
242 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
243 "$(CC_FLAGS_FTRACE)" ]; then \
244 $(sub_cmd_record_mcount) \
246 endif # CONFIG_FTRACE_MCOUNT_RECORD
248 ifdef CONFIG_STACK_VALIDATION
249 ifneq ($(SKIP_STACK_VALIDATION),1)
251 __objtool_obj := $(objtree)/tools/objtool/objtool
253 objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check)
255 ifndef CONFIG_FRAME_POINTER
256 objtool_args += --no-fp
258 ifdef CONFIG_GCOV_KERNEL
259 objtool_args += --no-unreachable
261 objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable)
264 # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
265 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
266 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
267 cmd_objtool = $(if $(patsubst y%,, \
268 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
269 $(__objtool_obj) $(objtool_args) "$(@)";)
270 objtool_obj = $(if $(patsubst y%,, \
271 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
274 endif # SKIP_STACK_VALIDATION
275 endif # CONFIG_STACK_VALIDATION
277 # Rebuild all objects when objtool changes, or is enabled/disabled.
278 objtool_dep = $(objtool_obj) \
279 $(wildcard include/config/orc/unwinder.h \
280 include/config/stack/validation.h)
283 $(call echo-cmd,checksrc) $(cmd_checksrc) \
284 $(call cmd_and_fixdep,cc_o_c) \
285 $(cmd_modversions_c) \
286 $(call echo-cmd,objtool) $(cmd_objtool) \
287 $(call echo-cmd,record_mcount) $(cmd_record_mcount)
291 $(call cmd_and_fixdep,as_o_S) \
292 $(cmd_modversions_S) \
293 $(call echo-cmd,objtool) $(cmd_objtool)
296 # List module undefined symbols (or empty line if not enabled)
297 ifdef CONFIG_TRIM_UNUSED_KSYMS
298 cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
300 cmd_undef_syms = echo
303 # Built-in and composite module parts
304 $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
305 $(call cmd,force_checksrc)
306 $(call if_changed_rule,cc_o_c)
308 # Single-part modules are special since we need to mark them in $(MODVERDIR)
310 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
311 $(call cmd,force_checksrc)
312 $(call if_changed_rule,cc_o_c)
313 @{ echo $(@:.o=.ko); echo $@; \
314 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
316 quiet_cmd_cc_lst_c = MKLST $@
317 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
318 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
319 System.map $(OBJDUMP) > $@
321 $(obj)/%.lst: $(src)/%.c FORCE
322 $(call if_changed_dep,cc_lst_c)
324 # Compile assembler sources (.S)
325 # ---------------------------------------------------------------------------
327 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
329 $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
330 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
332 # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
333 # or a file that it includes, in order to get versioned symbols. We build a
334 # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
335 # the .S file (with trailing ';'), and run genksyms on that, to extract vers.
337 # This is convoluted. The .S file must first be preprocessed to run guards and
338 # expand names, then the resulting exports must be constructed into plain
339 # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
340 # to make the genksyms input.
342 # These mirror gensymtypes_c and co above, keep them in synch.
343 cmd_gensymtypes_S = \
344 (echo "\#include <linux/kernel.h>" ; \
345 echo "\#include <asm/asm-prototypes.h>" ; \
346 $(CPP) $(a_flags) $< | \
347 grep "\<___EXPORT_SYMBOL\>" | \
348 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
349 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
350 $(GENKSYMS) $(if $(1), -T $(2)) \
351 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
352 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
353 $(if $(KBUILD_PRESERVE),-p) \
354 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
356 quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
357 cmd_cc_symtypes_S = \
359 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
360 test -s $@ || rm -f $@
362 $(obj)/%.symtypes : $(src)/%.S FORCE
363 $(call cmd,cc_symtypes_S)
366 quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
367 cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
369 $(obj)/%.s: $(src)/%.S FORCE
370 $(call if_changed_dep,cpp_s_S)
372 quiet_cmd_as_o_S = AS $(quiet_modtag) $@
374 ifndef CONFIG_MODVERSIONS
375 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
379 ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
381 ifeq ($(ASM_PROTOTYPES),)
382 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
386 # versioning matches the C process described above, with difference that
387 # we parse asm-prototypes.h C header to get function definitions.
389 cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
391 cmd_modversions_S = \
392 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
393 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
394 > $(@D)/.tmp_$(@F:.o=.ver); \
396 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
397 -T $(@D)/.tmp_$(@F:.o=.ver); \
398 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
400 mv -f $(@D)/.tmp_$(@F) $@; \
405 $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
406 $(call if_changed_rule,as_o_S)
408 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
409 targets += $(extra-y) $(MAKECMDGOALS) $(always)
411 # Linker scripts preprocessor (.lds.S -> .lds)
412 # ---------------------------------------------------------------------------
413 quiet_cmd_cpp_lds_S = LDS $@
414 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
415 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
417 $(obj)/%.lds: $(src)/%.lds.S FORCE
418 $(call if_changed_dep,cpp_lds_S)
421 # ---------------------------------------------------------------------------
422 quiet_cmd_asn1_compiler = ASN.1 $@
423 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
424 $(subst .h,.c,$@) $(subst .c,.h,$@)
426 .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
428 $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
429 $(call cmd,asn1_compiler)
431 # Build the compiled-in targets
432 # ---------------------------------------------------------------------------
434 # To build objects in subdirs, we need to descend into the directories
435 $(sort $(subdir-obj-y)): $(subdir-ym) ;
438 # Rule to compile a set of .o files into one .o file
442 ifdef CONFIG_THIN_ARCHIVES
443 cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
444 cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
445 quiet_cmd_link_o_target = AR $@
447 cmd_make_builtin = $(LD) $(ld_flags) -r -o
448 cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
449 quiet_cmd_link_o_target = LD $@
452 # If the list of objects to link is empty, just create an empty built-in.o
453 cmd_link_o_target = $(if $(strip $(obj-y)),\
454 $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
456 $(cmd_make_empty_builtin) $@)
458 $(builtin-target): $(obj-y) FORCE
459 $(call if_changed,link_o_target)
461 targets += $(builtin-target)
462 endif # builtin-target
465 # Rule to create modules.order file
467 # Create commands to either record .ko file or cat modules.order from
470 $(foreach m, $(modorder), \
471 $(if $(filter %/modules.order, $m), \
472 cat $m;, echo kernel/$m;))
474 $(modorder-target): $(subdir-ym) FORCE
475 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
478 # Rule to compile a set of .o files into one .a file
481 quiet_cmd_link_l_target = AR $@
483 ifdef CONFIG_THIN_ARCHIVES
484 cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
486 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
489 $(lib-target): $(lib-y) FORCE
490 $(call if_changed,link_l_target)
492 targets += $(lib-target)
494 dummy-object = $(obj)/.lib_exports.o
495 ksyms-lds = $(dot-target).lds
496 ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
497 ref_prefix = EXTERN(_
502 quiet_cmd_export_list = EXPORTS $@
503 cmd_export_list = $(OBJDUMP) -h $< | \
504 sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\
505 rm -f $(dummy-object);\
506 echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
507 $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
508 rm $(dummy-object) $(ksyms-lds)
510 $(obj)/lib-ksyms.o: $(lib-target) FORCE
511 $(call if_changed,export_list)
513 targets += $(obj)/lib-ksyms.o
518 # Rule to link composite objects
520 # Composite objects are specified in kbuild makefile as follows:
521 # <composite-object>-objs := <list of .o files>
523 # <composite-object>-y := <list of .o files>
525 # <composite-object>-m := <list of .o files>
526 # The -m syntax only works if <composite object> is a module
528 $(filter $(addprefix $(obj)/, \
529 $($(subst $(obj)/,,$(@:.o=-objs))) \
530 $($(subst $(obj)/,,$(@:.o=-y))) \
531 $($(subst $(obj)/,,$(@:.o=-m)))), $^)
533 cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
535 ifdef CONFIG_THIN_ARCHIVES
536 quiet_cmd_link_multi-y = AR $@
537 cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps)
539 quiet_cmd_link_multi-y = LD $@
540 cmd_link_multi-y = $(cmd_link_multi-link)
543 quiet_cmd_link_multi-m = LD [M] $@
544 cmd_link_multi-m = $(cmd_link_multi-link)
546 $(multi-used-y): FORCE
547 $(call if_changed,link_multi-y)
548 $(call multi_depend, $(multi-used-y), .o, -objs -y)
550 $(multi-used-m): FORCE
551 $(call if_changed,link_multi-m)
552 @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
553 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
554 $(call multi_depend, $(multi-used-m), .o, -objs -y -m)
556 targets += $(multi-used-y) $(multi-used-m)
557 targets := $(filter-out $(PHONY), $(targets))
560 # ---------------------------------------------------------------------------
562 PHONY += $(subdir-ym)
564 $(Q)$(MAKE) $(build)=$@
566 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
567 # ---------------------------------------------------------------------------
573 # Read all saved command lines and dependencies for the $(targets) we
574 # may be building above, using $(if_changed{,_dep}). As an
575 # optimization, we don't need to read them if the target does not
576 # exist, we will rebuild anyway in that case.
578 cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
580 ifneq ($(cmd_files),)
584 ifneq ($(KBUILD_SRC),)
585 # Create directories for object files if they do not exist
586 obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets))))
587 # If cmd_files exist, their directories apparently exist. Skip mkdir.
588 exist-dirs := $(sort $(patsubst %/,%, $(dir $(cmd_files))))
589 obj-dirs := $(strip $(filter-out $(exist-dirs), $(obj-dirs)))
591 $(shell mkdir -p $(obj-dirs))
595 # Declare the contents of the .PHONY variable as phony. We keep that
596 # information in a variable se we can use it in if_changed and friends.