Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1# SPDX-License-Identifier: GPL-2.0
2# ==========================================================================
3# Building
4# ==========================================================================
5
6src := $(obj)
7
8PHONY := __build
9__build:
10
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
14obj-y :=
15obj-m :=
16lib-y :=
17lib-m :=
18always-y :=
19always-m :=
20targets :=
21subdir-y :=
22subdir-m :=
23EXTRA_AFLAGS :=
24EXTRA_CFLAGS :=
25EXTRA_CPPFLAGS :=
26EXTRA_LDFLAGS :=
27asflags-y :=
28ccflags-y :=
29cppflags-y :=
30ldflags-y :=
31
32subdir-asflags-y :=
33subdir-ccflags-y :=
34
35# Read auto.conf if it exists, otherwise ignore
36-include include/config/auto.conf
37
38include $(srctree)/scripts/Kbuild.include
39include $(srctree)/scripts/Makefile.compiler
40
41# The filename Kbuild has precedence over Makefile
42kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
43kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
44include $(kbuild-file)
45
46include $(srctree)/scripts/Makefile.lib
47
48# Do not include hostprogs rules unless needed.
49# $(sort ...) is used here to remove duplicated words and excessive spaces.
50hostprogs := $(sort $(hostprogs))
51ifneq ($(hostprogs),)
52include $(srctree)/scripts/Makefile.host
53endif
54
55# Do not include userprogs rules unless needed.
56# $(sort ...) is used here to remove duplicated words and excessive spaces.
57userprogs := $(sort $(userprogs))
58ifneq ($(userprogs),)
59include $(srctree)/scripts/Makefile.userprogs
60endif
61
62ifndef obj
63$(warning kbuild: Makefile.build is included improperly)
64endif
65
66ifeq ($(need-modorder),)
67ifneq ($(obj-m),)
68$(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)
69$(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)
70endif
71endif
72
73# ===========================================================================
74
75# subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...)
76subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y)))
77subdir-modorder := $(sort $(filter %/modules.order, $(obj-m)))
78
79targets-for-builtin := $(extra-y)
80
81ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
82targets-for-builtin += $(obj)/lib.a
83endif
84
85ifdef need-builtin
86targets-for-builtin += $(obj)/built-in.a
87endif
88
89targets-for-modules := $(patsubst %.o, %.mod, $(filter %.o, $(obj-m)))
90
91ifdef need-modorder
92targets-for-modules += $(obj)/modules.order
93endif
94
95targets += $(targets-for-builtin) $(targets-for-modules)
96
97# Linus' kernel sanity checking tool
98ifeq ($(KBUILD_CHECKSRC),1)
99 quiet_cmd_checksrc = CHECK $<
100 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
101else ifeq ($(KBUILD_CHECKSRC),2)
102 quiet_cmd_force_checksrc = CHECK $<
103 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
104endif
105
106ifneq ($(KBUILD_EXTRA_WARN),)
107 cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
108endif
109
110# Compile C sources (.c)
111# ---------------------------------------------------------------------------
112
113quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
114 cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $<
115
116$(obj)/%.s: $(src)/%.c FORCE
117 $(call if_changed_dep,cc_s_c)
118
119quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
120cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
121
122$(obj)/%.i: $(src)/%.c FORCE
123 $(call if_changed_dep,cpp_i_c)
124
125# These mirror gensymtypes_S and co below, keep them in synch.
126cmd_gensymtypes_c = \
127 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
128 scripts/genksyms/genksyms $(if $(1), -T $(2)) \
129 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
130 $(if $(KBUILD_PRESERVE),-p) \
131 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
132
133quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
134cmd_cc_symtypes_c = \
135 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
136 test -s $@ || rm -f $@
137
138$(obj)/%.symtypes : $(src)/%.c FORCE
139 $(call cmd,cc_symtypes_c)
140
141# LLVM assembly
142# Generate .ll files from .c
143quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
144 cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
145
146$(obj)/%.ll: $(src)/%.c FORCE
147 $(call if_changed_dep,cc_ll_c)
148
149# C (.c) files
150# The C file is compiled and updated dependency information is generated.
151# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
152
153quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
154 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
155
156ifdef CONFIG_MODVERSIONS
157# When module versioning is enabled the following steps are executed:
158# o compile a <file>.o from <file>.c
159# o if <file>.o doesn't contain a __ksymtab version, i.e. does
160# not export symbols, it's done.
161# o otherwise, we calculate symbol versions using the good old
162# genksyms on the preprocessed source and postprocess them in a way
163# that they are usable as a linker script
164# o generate .tmp_<file>.o from <file>.o using the linker to
165# replace the unresolved symbols __crc_exported_symbol with
166# the actual value of the checksum generated by genksyms
167# o remove .tmp_<file>.o to <file>.o
168
169ifdef CONFIG_LTO_CLANG
170# Generate .o.symversions files for each .o with exported symbols, and link these
171# to the kernel and/or modules at the end.
172cmd_modversions_c = \
173 if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \
174 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
175 > $@.symversions; \
176 fi;
177else
178cmd_modversions_c = \
179 if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
180 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
181 > $(@D)/.tmp_$(@F:.o=.ver); \
182 \
183 $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
184 -T $(@D)/.tmp_$(@F:.o=.ver); \
185 mv -f $(@D)/.tmp_$(@F) $@; \
186 rm -f $(@D)/.tmp_$(@F:.o=.ver); \
187 fi
188endif
189endif
190
191ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
192# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
193ifdef BUILD_C_RECORDMCOUNT
194ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
195 RECORDMCOUNT_FLAGS = -w
196endif
197# Due to recursion, we must skip empty.o.
198# The empty.o file is created in the make process in order to determine
199# the target endianness and word size. It is made before all other C
200# files, including recordmcount.
201sub_cmd_record_mcount = \
202 if [ $(@) != "scripts/mod/empty.o" ]; then \
203 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
204 fi;
205recordmcount_source := $(srctree)/scripts/recordmcount.c \
206 $(srctree)/scripts/recordmcount.h
207else
208sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
209 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
210 "$(if $(CONFIG_64BIT),64,32)" \
211 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
212 "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
213 "$(if $(part-of-module),1,0)" "$(@)";
214recordmcount_source := $(srctree)/scripts/recordmcount.pl
215endif # BUILD_C_RECORDMCOUNT
216cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \
217 $(sub_cmd_record_mcount))
218endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
219
220ifdef CONFIG_STACK_VALIDATION
221ifndef CONFIG_LTO_CLANG
222ifneq ($(SKIP_STACK_VALIDATION),1)
223
224__objtool_obj := $(objtree)/tools/objtool/objtool
225
226# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
227# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
228# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
229cmd_objtool = $(if $(patsubst y%,, \
230 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
231 $(__objtool_obj) $(objtool_args) $@)
232objtool_obj = $(if $(patsubst y%,, \
233 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
234 $(__objtool_obj))
235
236endif # SKIP_STACK_VALIDATION
237endif # CONFIG_LTO_CLANG
238endif # CONFIG_STACK_VALIDATION
239
240# Rebuild all objects when objtool changes, or is enabled/disabled.
241objtool_dep = $(objtool_obj) \
242 $(wildcard include/config/ORC_UNWINDER \
243 include/config/STACK_VALIDATION)
244
245ifdef CONFIG_TRIM_UNUSED_KSYMS
246cmd_gen_ksymdeps = \
247 $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
248
249# List module undefined symbols
250undefined_syms = $(NM) $< | $(AWK) '$$1 == "U" { printf("%s%s", x++ ? " " : "", $$2) }';
251endif
252
253define rule_cc_o_c
254 $(call cmd_and_fixdep,cc_o_c)
255 $(call cmd,gen_ksymdeps)
256 $(call cmd,checksrc)
257 $(call cmd,checkdoc)
258 $(call cmd,objtool)
259 $(call cmd,modversions_c)
260 $(call cmd,record_mcount)
261endef
262
263define rule_as_o_S
264 $(call cmd_and_fixdep,as_o_S)
265 $(call cmd,gen_ksymdeps)
266 $(call cmd,objtool)
267 $(call cmd,modversions_S)
268endef
269
270# Built-in and composite module parts
271$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
272 $(call if_changed_rule,cc_o_c)
273 $(call cmd,force_checksrc)
274
275cmd_mod = { \
276 echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \
277 $(undefined_syms) echo; \
278 } > $@
279
280$(obj)/%.mod: $(obj)/%.o FORCE
281 $(call if_changed,mod)
282
283quiet_cmd_cc_lst_c = MKLST $@
284 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
285 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
286 System.map $(OBJDUMP) > $@
287
288$(obj)/%.lst: $(src)/%.c FORCE
289 $(call if_changed_dep,cc_lst_c)
290
291# Compile assembler sources (.S)
292# ---------------------------------------------------------------------------
293
294# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
295# or a file that it includes, in order to get versioned symbols. We build a
296# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
297# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
298#
299# This is convoluted. The .S file must first be preprocessed to run guards and
300# expand names, then the resulting exports must be constructed into plain
301# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
302# to make the genksyms input.
303#
304# These mirror gensymtypes_c and co above, keep them in synch.
305cmd_gensymtypes_S = \
306 { echo "\#include <linux/kernel.h>" ; \
307 echo "\#include <asm/asm-prototypes.h>" ; \
308 $(CPP) $(a_flags) $< | \
309 grep "\<___EXPORT_SYMBOL\>" | \
310 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \
311 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
312 scripts/genksyms/genksyms $(if $(1), -T $(2)) \
313 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
314 $(if $(KBUILD_PRESERVE),-p) \
315 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
316
317quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
318cmd_cc_symtypes_S = \
319 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
320 test -s $@ || rm -f $@
321
322$(obj)/%.symtypes : $(src)/%.S FORCE
323 $(call cmd,cc_symtypes_S)
324
325
326quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
327cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
328
329$(obj)/%.s: $(src)/%.S FORCE
330 $(call if_changed_dep,cpp_s_S)
331
332quiet_cmd_as_o_S = AS $(quiet_modtag) $@
333 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
334
335ifdef CONFIG_ASM_MODVERSIONS
336
337# versioning matches the C process described above, with difference that
338# we parse asm-prototypes.h C header to get function definitions.
339
340cmd_modversions_S = \
341 if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
342 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
343 > $(@D)/.tmp_$(@F:.o=.ver); \
344 \
345 $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
346 -T $(@D)/.tmp_$(@F:.o=.ver); \
347 mv -f $(@D)/.tmp_$(@F) $@; \
348 rm -f $(@D)/.tmp_$(@F:.o=.ver); \
349 fi
350endif
351
352$(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
353 $(call if_changed_rule,as_o_S)
354
355targets += $(filter-out $(subdir-builtin), $(real-obj-y))
356targets += $(filter-out $(subdir-modorder), $(real-obj-m))
357targets += $(real-dtb-y) $(lib-y) $(always-y) $(MAKECMDGOALS)
358
359# Linker scripts preprocessor (.lds.S -> .lds)
360# ---------------------------------------------------------------------------
361quiet_cmd_cpp_lds_S = LDS $@
362 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
363 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
364
365$(obj)/%.lds: $(src)/%.lds.S FORCE
366 $(call if_changed_dep,cpp_lds_S)
367
368# ASN.1 grammar
369# ---------------------------------------------------------------------------
370quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch]
371 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
372 $(basename $@).c $(basename $@).h
373
374$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
375 $(call cmd,asn1_compiler)
376
377# Build the compiled-in targets
378# ---------------------------------------------------------------------------
379
380# To build objects in subdirs, we need to descend into the directories
381$(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ;
382$(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ;
383
384# combine symversions for later processing
385quiet_cmd_update_lto_symversions = SYMVER $@
386ifeq ($(CONFIG_LTO_CLANG) $(CONFIG_MODVERSIONS),y y)
387 cmd_update_lto_symversions = \
388 rm -f $@.symversions \
389 $(foreach n, $(filter-out FORCE,$^), \
390 $(if $(wildcard $(n).symversions), \
391 ; cat $(n).symversions >> $@.symversions))
392else
393 cmd_update_lto_symversions = echo >/dev/null
394endif
395
396#
397# Rule to compile a set of .o files into one .a file (without symbol table)
398#
399
400quiet_cmd_ar_builtin = AR $@
401 cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs)
402
403quiet_cmd_ar_and_symver = AR $@
404 cmd_ar_and_symver = $(cmd_update_lto_symversions); $(cmd_ar_builtin)
405
406$(obj)/built-in.a: $(real-obj-y) FORCE
407 $(call if_changed,ar_and_symver)
408
409#
410# Rule to create modules.order file
411#
412# Create commands to either record .ko file or cat modules.order from
413# a subdirectory
414# Add $(obj-m) as the prerequisite to avoid updating the timestamp of
415# modules.order unless contained modules are updated.
416
417cmd_modules_order = { $(foreach m, $(real-prereqs), \
418 $(if $(filter %/modules.order, $m), cat $m, echo $(patsubst %.o,%.ko,$m));) :; } \
419 | $(AWK) '!x[$$0]++' - > $@
420
421$(obj)/modules.order: $(obj-m) FORCE
422 $(call if_changed,modules_order)
423
424#
425# Rule to compile a set of .o files into one .a file (with symbol table)
426#
427quiet_cmd_ar_lib = AR $@
428 cmd_ar_lib = $(cmd_update_lto_symversions); $(cmd_ar)
429
430$(obj)/lib.a: $(lib-y) FORCE
431 $(call if_changed,ar_lib)
432
433# NOTE:
434# Do not replace $(filter %.o,^) with $(real-prereqs). When a single object
435# module is turned into a multi object module, $^ will contain header file
436# dependencies recorded in the .*.cmd file.
437ifdef CONFIG_LTO_CLANG
438quiet_cmd_link_multi-m = AR [M] $@
439cmd_link_multi-m = \
440 $(cmd_update_lto_symversions); \
441 rm -f $@; \
442 $(AR) cDPrsT $@ $(filter %.o,$^)
443else
444quiet_cmd_link_multi-m = LD [M] $@
445 cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^)
446endif
447
448$(multi-obj-m): FORCE
449 $(call if_changed,link_multi-m)
450$(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
451
452targets += $(multi-obj-m)
453targets := $(filter-out $(PHONY), $(targets))
454
455# Add intermediate targets:
456# When building objects with specific suffix patterns, add intermediate
457# targets that the final targets are derived from.
458intermediate_targets = $(foreach sfx, $(2), \
459 $(patsubst %$(strip $(1)),%$(sfx), \
460 $(filter %$(strip $(1)), $(targets))))
461# %.asn1.o <- %.asn1.[ch] <- %.asn1
462# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
463# %.lex.o <- %.lex.c <- %.l
464# %.tab.o <- %.tab.[ch] <- %.y
465targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
466 $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
467 $(call intermediate_targets, .lex.o, .lex.c) \
468 $(call intermediate_targets, .tab.o, .tab.c .tab.h)
469
470# Build
471# ---------------------------------------------------------------------------
472
473ifdef single-build
474
475KBUILD_SINGLE_TARGETS := $(filter $(obj)/%, $(KBUILD_SINGLE_TARGETS))
476
477curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \
478 $(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x))))
479
480# Handle single targets without any rule: show "Nothing to be done for ..." or
481# "No rule to make target ..." depending on whether the target exists.
482unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \
483 $(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS)))
484
485single-subdirs := $(foreach d, $(subdir-ym), \
486 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
487
488__build: $(curdir-single) $(single-subdirs)
489ifneq ($(unknown-single),)
490 $(Q)$(MAKE) -f /dev/null $(unknown-single)
491endif
492 @:
493
494ifeq ($(curdir-single),)
495# Nothing to do in this directory. Do not include any .*.cmd file for speed-up
496targets :=
497else
498targets += $(curdir-single)
499endif
500
501else
502
503__build: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \
504 $(if $(KBUILD_MODULES), $(targets-for-modules)) \
505 $(subdir-ym) $(always-y)
506 @:
507
508endif
509
510# Descending
511# ---------------------------------------------------------------------------
512
513PHONY += $(subdir-ym)
514$(subdir-ym):
515 $(Q)$(MAKE) $(build)=$@ \
516 $(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \
517 need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \
518 need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1)
519
520# Add FORCE to the prequisites of a target to force it to be always rebuilt.
521# ---------------------------------------------------------------------------
522
523PHONY += FORCE
524
525FORCE:
526
527# Read all saved command lines and dependencies for the $(targets) we
528# may be building above, using $(if_changed{,_dep}). As an
529# optimization, we don't need to read them if the target does not
530# exist, we will rebuild anyway in that case.
531
532existing-targets := $(wildcard $(sort $(targets)))
533
534-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
535
536# Create directories for object files if they do not exist
537obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets))))
538# If targets exist, their directories apparently exist. Skip mkdir.
539existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
540obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
541ifneq ($(obj-dirs),)
542$(shell mkdir -p $(obj-dirs))
543endif
544
545.PHONY: $(PHONY)