Merge tag 'kbuild-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy...
[muen/linux.git] / scripts / Makefile.build
1 # SPDX-License-Identifier: GPL-2.0
2 # ==========================================================================
3 # Building
4 # ==========================================================================
5
6 src := $(obj)
7
8 PHONY := __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
14 obj-y :=
15 obj-m :=
16 lib-y :=
17 lib-m :=
18 always :=
19 targets :=
20 subdir-y :=
21 subdir-m :=
22 EXTRA_AFLAGS   :=
23 EXTRA_CFLAGS   :=
24 EXTRA_CPPFLAGS :=
25 EXTRA_LDFLAGS  :=
26 asflags-y  :=
27 ccflags-y  :=
28 cppflags-y :=
29 ldflags-y  :=
30
31 subdir-asflags-y :=
32 subdir-ccflags-y :=
33
34 # Read auto.conf if it exists, otherwise ignore
35 -include include/config/auto.conf
36
37 include scripts/Kbuild.include
38
39 # The filename Kbuild has precedence over Makefile
40 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
41 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
42 include $(kbuild-file)
43
44 include scripts/Makefile.lib
45
46 # Do not include host rules unless needed
47 ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
48 include scripts/Makefile.host
49 endif
50
51 ifndef obj
52 $(warning kbuild: Makefile.build is included improperly)
53 endif
54
55 # ===========================================================================
56
57 ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
58 lib-target := $(obj)/lib.a
59 real-obj-y += $(obj)/lib-ksyms.o
60 endif
61
62 ifneq ($(strip $(real-obj-y) $(need-builtin)),)
63 builtin-target := $(obj)/built-in.a
64 endif
65
66 modorder-target := $(obj)/modules.order
67
68 # We keep a list of all modules in $(MODVERDIR)
69
70 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
71          $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
72          $(subdir-ym) $(always)
73         @:
74
75 # Linus' kernel sanity checking tool
76 ifeq ($(KBUILD_CHECKSRC),1)
77   quiet_cmd_checksrc       = CHECK   $<
78         cmd_checksrc       = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
79 else ifeq ($(KBUILD_CHECKSRC),2)
80   quiet_cmd_force_checksrc = CHECK   $<
81         cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
82 endif
83
84 ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
85   cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
86 endif
87
88 # Do section mismatch analysis for each module/built-in.a
89 ifdef CONFIG_DEBUG_SECTION_MISMATCH
90   cmd_secanalysis = ; scripts/mod/modpost $@
91 endif
92
93 # Compile C sources (.c)
94 # ---------------------------------------------------------------------------
95
96 # Default is built-in, unless we know otherwise
97 $(foreach x, i ll lst o s symtypes, $(patsubst %.o,%.$(x),$(real-obj-m))): \
98         part-of-module := y
99
100 modkern_cflags =                                          \
101         $(if $(part-of-module),                           \
102                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
103                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
104 quiet_modtag = $(if $(part-of-module),[M],   )
105
106 quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
107 cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
108
109 $(obj)/%.s: $(src)/%.c FORCE
110         $(call if_changed_dep,cc_s_c)
111
112 quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
113 cmd_cpp_i_c       = $(CPP) $(c_flags) -o $@ $<
114
115 $(obj)/%.i: $(src)/%.c FORCE
116         $(call if_changed_dep,cpp_i_c)
117
118 # These mirror gensymtypes_S and co below, keep them in synch.
119 cmd_gensymtypes_c =                                                         \
120     $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
121     $(GENKSYMS) $(if $(1), -T $(2))                                         \
122      $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \
123      $(if $(KBUILD_PRESERVE),-p)                                            \
124      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
125
126 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
127 cmd_cc_symtypes_c =                                                         \
128     $(call cmd_gensymtypes_c,true,$@) >/dev/null;                           \
129     test -s $@ || rm -f $@
130
131 $(obj)/%.symtypes : $(src)/%.c FORCE
132         $(call cmd,cc_symtypes_c)
133
134 # LLVM assembly
135 # Generate .ll files from .c
136 quiet_cmd_cc_ll_c = CC $(quiet_modtag)  $@
137       cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
138
139 $(obj)/%.ll: $(src)/%.c FORCE
140         $(call if_changed_dep,cc_ll_c)
141
142 # C (.c) files
143 # The C file is compiled and updated dependency information is generated.
144 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
145
146 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
147       cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
148
149 ifdef CONFIG_MODVERSIONS
150 # When module versioning is enabled the following steps are executed:
151 # o compile a <file>.o from <file>.c
152 # o if <file>.o doesn't contain a __ksymtab version, i.e. does
153 #   not export symbols, it's done.
154 # o otherwise, we calculate symbol versions using the good old
155 #   genksyms on the preprocessed source and postprocess them in a way
156 #   that they are usable as a linker script
157 # o generate .tmp_<file>.o from <file>.o using the linker to
158 #   replace the unresolved symbols __crc_exported_symbol with
159 #   the actual value of the checksum generated by genksyms
160 # o remove .tmp_<file>.o to <file>.o
161
162 cmd_modversions_c =                                                             \
163         if $(OBJDUMP) -h $@ | grep -q __ksymtab; then                           \
164                 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))  \
165                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
166                                                                                 \
167                 $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@               \
168                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
169                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
170                 rm -f $(@D)/.tmp_$(@F:.o=.ver);                                 \
171         fi
172 endif
173
174 ifdef CONFIG_FTRACE_MCOUNT_RECORD
175 ifndef CC_USING_RECORD_MCOUNT
176 # compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
177 ifdef BUILD_C_RECORDMCOUNT
178 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
179   RECORDMCOUNT_FLAGS = -w
180 endif
181 # Due to recursion, we must skip empty.o.
182 # The empty.o file is created in the make process in order to determine
183 # the target endianness and word size. It is made before all other C
184 # files, including recordmcount.
185 sub_cmd_record_mcount =                                 \
186         if [ $(@) != "scripts/mod/empty.o" ]; then      \
187                 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";   \
188         fi;
189 recordmcount_source := $(srctree)/scripts/recordmcount.c \
190                     $(srctree)/scripts/recordmcount.h
191 else
192 sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
193         "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
194         "$(if $(CONFIG_64BIT),64,32)" \
195         "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
196         "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
197         "$(if $(part-of-module),1,0)" "$(@)";
198 recordmcount_source := $(srctree)/scripts/recordmcount.pl
199 endif # BUILD_C_RECORDMCOUNT
200 cmd_record_mcount =                                             \
201         if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" =   \
202              "$(CC_FLAGS_FTRACE)" ]; then                       \
203                 $(sub_cmd_record_mcount)                        \
204         fi
205 endif # CC_USING_RECORD_MCOUNT
206 endif # CONFIG_FTRACE_MCOUNT_RECORD
207
208 ifdef CONFIG_STACK_VALIDATION
209 ifneq ($(SKIP_STACK_VALIDATION),1)
210
211 __objtool_obj := $(objtree)/tools/objtool/objtool
212
213 objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check)
214
215 objtool_args += $(if $(part-of-module), --module,)
216
217 ifndef CONFIG_FRAME_POINTER
218 objtool_args += --no-fp
219 endif
220 ifdef CONFIG_GCOV_KERNEL
221 objtool_args += --no-unreachable
222 endif
223 ifdef CONFIG_RETPOLINE
224   objtool_args += --retpoline
225 endif
226
227 # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
228 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
229 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
230 cmd_objtool = $(if $(patsubst y%,, \
231         $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
232         $(__objtool_obj) $(objtool_args) $@)
233 objtool_obj = $(if $(patsubst y%,, \
234         $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
235         $(__objtool_obj))
236
237 endif # SKIP_STACK_VALIDATION
238 endif # CONFIG_STACK_VALIDATION
239
240 # Rebuild all objects when objtool changes, or is enabled/disabled.
241 objtool_dep = $(objtool_obj)                                    \
242               $(wildcard include/config/orc/unwinder.h          \
243                          include/config/stack/validation.h)
244
245 ifdef CONFIG_TRIM_UNUSED_KSYMS
246 cmd_gen_ksymdeps = \
247         $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
248 endif
249
250 define rule_cc_o_c
251         $(call cmd,checksrc)
252         $(call cmd_and_fixdep,cc_o_c)
253         $(call cmd,gen_ksymdeps)
254         $(call cmd,checkdoc)
255         $(call cmd,objtool)
256         $(call cmd,modversions_c)
257         $(call cmd,record_mcount)
258 endef
259
260 define rule_as_o_S
261         $(call cmd_and_fixdep,as_o_S)
262         $(call cmd,gen_ksymdeps)
263         $(call cmd,objtool)
264         $(call cmd,modversions_S)
265 endef
266
267 # List module undefined symbols (or empty line if not enabled)
268 ifdef CONFIG_TRIM_UNUSED_KSYMS
269 cmd_undef_syms = $(NM) $@ | sed -n 's/^  *U //p' | xargs echo
270 else
271 cmd_undef_syms = echo
272 endif
273
274 # Built-in and composite module parts
275 $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
276         $(call cmd,force_checksrc)
277         $(call if_changed_rule,cc_o_c)
278
279 # Single-part modules are special since we need to mark them in $(MODVERDIR)
280
281 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
282         $(call cmd,force_checksrc)
283         $(call if_changed_rule,cc_o_c)
284         @{ echo $(@:.o=.ko); echo $@; \
285            $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
286
287 quiet_cmd_cc_lst_c = MKLST   $@
288       cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
289                      $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
290                                      System.map $(OBJDUMP) > $@
291
292 $(obj)/%.lst: $(src)/%.c FORCE
293         $(call if_changed_dep,cc_lst_c)
294
295 # Compile assembler sources (.S)
296 # ---------------------------------------------------------------------------
297
298 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
299
300 $(real-obj-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
301 $(real-obj-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
302
303 # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
304 # or a file that it includes, in order to get versioned symbols. We build a
305 # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
306 # the .S file (with trailing ';'), and run genksyms on that, to extract vers.
307 #
308 # This is convoluted. The .S file must first be preprocessed to run guards and
309 # expand names, then the resulting exports must be constructed into plain
310 # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
311 # to make the genksyms input.
312 #
313 # These mirror gensymtypes_c and co above, keep them in synch.
314 cmd_gensymtypes_S =                                                         \
315     (echo "\#include <linux/kernel.h>" ;                                    \
316      echo "\#include <asm/asm-prototypes.h>" ;                              \
317     $(CPP) $(a_flags) $< |                                                  \
318      grep "\<___EXPORT_SYMBOL\>" |                                          \
319      sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
320     $(CPP) -D__GENKSYMS__ $(c_flags) -xc - |                                \
321     $(GENKSYMS) $(if $(1), -T $(2))                                         \
322      $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \
323      $(if $(KBUILD_PRESERVE),-p)                                            \
324      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
325
326 quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
327 cmd_cc_symtypes_S =                                                         \
328     $(call cmd_gensymtypes_S,true,$@) >/dev/null;                           \
329     test -s $@ || rm -f $@
330
331 $(obj)/%.symtypes : $(src)/%.S FORCE
332         $(call cmd,cc_symtypes_S)
333
334
335 quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
336 cmd_cpp_s_S       = $(CPP) $(a_flags) -o $@ $<
337
338 $(obj)/%.s: $(src)/%.S FORCE
339         $(call if_changed_dep,cpp_s_S)
340
341 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
342       cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
343
344 ifdef CONFIG_MODVERSIONS
345
346 ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
347
348 ifneq ($(ASM_PROTOTYPES),)
349
350 # versioning matches the C process described above, with difference that
351 # we parse asm-prototypes.h C header to get function definitions.
352
353 cmd_modversions_S =                                                             \
354         if $(OBJDUMP) -h $@ | grep -q __ksymtab; then                           \
355                 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))  \
356                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
357                                                                                 \
358                 $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@               \
359                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
360                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
361                 rm -f $(@D)/.tmp_$(@F:.o=.ver);                                 \
362         fi
363 endif
364 endif
365
366 $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
367         $(call if_changed_rule,as_o_S)
368
369 targets += $(filter-out $(subdir-obj-y), $(real-obj-y)) $(real-obj-m) $(lib-y)
370 targets += $(extra-y) $(MAKECMDGOALS) $(always)
371
372 # Linker scripts preprocessor (.lds.S -> .lds)
373 # ---------------------------------------------------------------------------
374 quiet_cmd_cpp_lds_S = LDS     $@
375       cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
376                              -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
377
378 $(obj)/%.lds: $(src)/%.lds.S FORCE
379         $(call if_changed_dep,cpp_lds_S)
380
381 # ASN.1 grammar
382 # ---------------------------------------------------------------------------
383 quiet_cmd_asn1_compiler = ASN.1   $@
384       cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
385                                 $(subst .h,.c,$@) $(subst .c,.h,$@)
386
387 $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
388         $(call cmd,asn1_compiler)
389
390 # Build the compiled-in targets
391 # ---------------------------------------------------------------------------
392
393 # To build objects in subdirs, we need to descend into the directories
394 $(sort $(subdir-obj-y)): $(subdir-ym) ;
395
396 #
397 # Rule to compile a set of .o files into one .o file
398 #
399 ifdef builtin-target
400
401 # built-in.a archives are made with no symbol table or index which
402 # makes them small and fast, but unable to be used by the linker.
403 # scripts/link-vmlinux.sh builds an aggregate built-in.a with a symbol
404 # table and index.
405 quiet_cmd_ar_builtin = AR      $@
406       cmd_ar_builtin = rm -f $@; \
407                      $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(filter $(real-obj-y), $^)
408
409 $(builtin-target): $(real-obj-y) FORCE
410         $(call if_changed,ar_builtin)
411
412 targets += $(builtin-target)
413 endif # builtin-target
414
415 #
416 # Rule to create modules.order file
417 #
418 # Create commands to either record .ko file or cat modules.order from
419 # a subdirectory
420 modorder-cmds =                                         \
421         $(foreach m, $(modorder),                       \
422                 $(if $(filter %/modules.order, $m),     \
423                         cat $m;, echo kernel/$m;))
424
425 $(modorder-target): $(subdir-ym) FORCE
426         $(Q)(cat /dev/null; $(modorder-cmds)) > $@
427
428 #
429 # Rule to compile a set of .o files into one .a file
430 #
431 ifdef lib-target
432 quiet_cmd_link_l_target = AR      $@
433
434 # lib target archives do get a symbol table and index
435 cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
436
437 $(lib-target): $(lib-y) FORCE
438         $(call if_changed,link_l_target)
439
440 targets += $(lib-target)
441
442 dummy-object = $(obj)/.lib_exports.o
443 ksyms-lds = $(dot-target).lds
444
445 quiet_cmd_export_list = EXPORTS $@
446 cmd_export_list = $(OBJDUMP) -h $< | \
447         sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/EXTERN(\1)/p' >$(ksyms-lds);\
448         rm -f $(dummy-object);\
449         echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
450         $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
451         rm $(dummy-object) $(ksyms-lds)
452
453 $(obj)/lib-ksyms.o: $(lib-target) FORCE
454         $(call if_changed,export_list)
455
456 targets += $(obj)/lib-ksyms.o
457
458 endif
459
460 quiet_cmd_link_multi-m = LD [M]  $@
461 cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^) $(cmd_secanalysis)
462
463 $(multi-used-m): FORCE
464         $(call if_changed,link_multi-m)
465         @{ echo $(@:.o=.ko); echo $(filter %.o,$^); \
466            $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
467 $(call multi_depend, $(multi-used-m), .o, -objs -y -m)
468
469 targets += $(multi-used-m)
470 targets := $(filter-out $(PHONY), $(targets))
471
472 # Add intermediate targets:
473 # When building objects with specific suffix patterns, add intermediate
474 # targets that the final targets are derived from.
475 intermediate_targets = $(foreach sfx, $(2), \
476                                 $(patsubst %$(strip $(1)),%$(sfx), \
477                                         $(filter %$(strip $(1)), $(targets))))
478 # %.asn1.o <- %.asn1.[ch] <- %.asn1
479 # %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
480 # %.lex.o <- %.lex.c <- %.l
481 # %.tab.o <- %.tab.[ch] <- %.y
482 targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
483            $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
484            $(call intermediate_targets, .lex.o, .lex.c) \
485            $(call intermediate_targets, .tab.o, .tab.c .tab.h)
486
487 # Descending
488 # ---------------------------------------------------------------------------
489
490 PHONY += $(subdir-ym)
491 $(subdir-ym):
492         $(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1)
493
494 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
495 # ---------------------------------------------------------------------------
496
497 PHONY += FORCE
498
499 FORCE:
500
501 # Read all saved command lines and dependencies for the $(targets) we
502 # may be building above, using $(if_changed{,_dep}). As an
503 # optimization, we don't need to read them if the target does not
504 # exist, we will rebuild anyway in that case.
505
506 existing-targets := $(wildcard $(sort $(targets)))
507
508 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
509
510 ifneq ($(KBUILD_SRC),)
511 # Create directories for object files if they do not exist
512 obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets))))
513 # If targets exist, their directories apparently exist. Skip mkdir.
514 existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
515 obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
516 ifneq ($(obj-dirs),)
517 $(shell mkdir -p $(obj-dirs))
518 endif
519 endif
520
521 .PHONY: $(PHONY)