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) $(need-builtin)),)
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) $< ;
103 ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
104 cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< ;
107 # Do section mismatch analysis for each module/built-in.o
108 ifdef CONFIG_DEBUG_SECTION_MISMATCH
109 cmd_secanalysis = ; scripts/mod/modpost $@
112 # Compile C sources (.c)
113 # ---------------------------------------------------------------------------
115 # Default is built-in, unless we know otherwise
117 $(if $(part-of-module), \
118 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
119 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
120 quiet_modtag := $(empty) $(empty)
122 $(real-objs-m) : part-of-module := y
123 $(real-objs-m:.o=.i) : part-of-module := y
124 $(real-objs-m:.o=.s) : part-of-module := y
125 $(real-objs-m:.o=.lst): part-of-module := y
127 $(real-objs-m) : quiet_modtag := [M]
128 $(real-objs-m:.o=.i) : quiet_modtag := [M]
129 $(real-objs-m:.o=.s) : quiet_modtag := [M]
130 $(real-objs-m:.o=.lst): quiet_modtag := [M]
132 $(obj-m) : quiet_modtag := [M]
134 # Default for not multi-part modules
135 modname = $(basetarget)
137 $(multi-objs-m) : modname = $(modname-multi)
138 $(multi-objs-m:.o=.i) : modname = $(modname-multi)
139 $(multi-objs-m:.o=.s) : modname = $(modname-multi)
140 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
141 $(multi-objs-y) : modname = $(modname-multi)
142 $(multi-objs-y:.o=.i) : modname = $(modname-multi)
143 $(multi-objs-y:.o=.s) : modname = $(modname-multi)
144 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
146 quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
147 cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
149 $(obj)/%.s: $(src)/%.c FORCE
150 $(call if_changed_dep,cc_s_c)
152 quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
153 cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
155 $(obj)/%.i: $(src)/%.c FORCE
156 $(call if_changed_dep,cpp_i_c)
158 # These mirror gensymtypes_S and co below, keep them in synch.
159 cmd_gensymtypes_c = \
160 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
161 $(GENKSYMS) $(if $(1), -T $(2)) \
162 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
163 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
164 $(if $(KBUILD_PRESERVE),-p) \
165 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
167 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
168 cmd_cc_symtypes_c = \
170 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
171 test -s $@ || rm -f $@
173 $(obj)/%.symtypes : $(src)/%.c FORCE
174 $(call cmd,cc_symtypes_c)
177 # Generate .ll files from .c
178 quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
179 cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
181 $(obj)/%.ll: $(src)/%.c FORCE
182 $(call if_changed_dep,cc_ll_c)
185 # The C file is compiled and updated dependency information is generated.
186 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
188 quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
190 ifndef CONFIG_MODVERSIONS
191 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
194 # When module versioning is enabled the following steps are executed:
195 # o compile a .tmp_<file>.o from <file>.c
196 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
197 # not export symbols, we just rename .tmp_<file>.o to <file>.o and
199 # o otherwise, we calculate symbol versions using the good old
200 # genksyms on the preprocessed source and postprocess them in a way
201 # that they are usable as a linker script
202 # o generate <file>.o from .tmp_<file>.o using the linker to
203 # replace the unresolved symbols __crc_exported_symbol with
204 # the actual value of the checksum generated by genksyms
206 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
208 cmd_modversions_c = \
209 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
210 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
211 > $(@D)/.tmp_$(@F:.o=.ver); \
213 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
214 -T $(@D)/.tmp_$(@F:.o=.ver); \
215 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
217 mv -f $(@D)/.tmp_$(@F) $@; \
221 ifdef CONFIG_FTRACE_MCOUNT_RECORD
222 ifdef BUILD_C_RECORDMCOUNT
223 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
224 RECORDMCOUNT_FLAGS = -w
226 # Due to recursion, we must skip empty.o.
227 # The empty.o file is created in the make process in order to determine
228 # the target endianness and word size. It is made before all other C
229 # files, including recordmcount.
230 sub_cmd_record_mcount = \
231 if [ $(@) != "scripts/mod/empty.o" ]; then \
232 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
234 recordmcount_source := $(srctree)/scripts/recordmcount.c \
235 $(srctree)/scripts/recordmcount.h
237 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
238 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
239 "$(if $(CONFIG_64BIT),64,32)" \
240 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
241 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
242 "$(if $(part-of-module),1,0)" "$(@)";
243 recordmcount_source := $(srctree)/scripts/recordmcount.pl
244 endif # BUILD_C_RECORDMCOUNT
245 cmd_record_mcount = \
246 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
247 "$(CC_FLAGS_FTRACE)" ]; then \
248 $(sub_cmd_record_mcount) \
250 endif # CONFIG_FTRACE_MCOUNT_RECORD
252 ifdef CONFIG_STACK_VALIDATION
253 ifneq ($(SKIP_STACK_VALIDATION),1)
255 __objtool_obj := $(objtree)/tools/objtool/objtool
257 objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check)
259 objtool_args += $(if $(part-of-module), --module,)
261 ifndef CONFIG_FRAME_POINTER
262 objtool_args += --no-fp
264 ifdef CONFIG_GCOV_KERNEL
265 objtool_args += --no-unreachable
267 objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable)
269 ifdef CONFIG_RETPOLINE
270 ifneq ($(RETPOLINE_CFLAGS),)
271 objtool_args += --retpoline
276 ifdef CONFIG_MODVERSIONS
277 objtool_o = $(@D)/.tmp_$(@F)
282 # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
283 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
284 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
285 cmd_objtool = $(if $(patsubst y%,, \
286 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
287 $(__objtool_obj) $(objtool_args) "$(objtool_o)";)
288 objtool_obj = $(if $(patsubst y%,, \
289 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
292 endif # SKIP_STACK_VALIDATION
293 endif # CONFIG_STACK_VALIDATION
295 # Rebuild all objects when objtool changes, or is enabled/disabled.
296 objtool_dep = $(objtool_obj) \
297 $(wildcard include/config/orc/unwinder.h \
298 include/config/stack/validation.h)
300 ifdef CONFIG_RETPOLINE
301 cmd_ubuntu_retpoline = $(CONFIG_SHELL) $(srctree)/scripts/ubuntu-retpoline-extract-one $(@) $(<) "$(filter -m16 %code16gcc.h,$(a_flags))";
303 cmd_ubuntu_retpoline =
307 $(call echo-cmd,checksrc) $(cmd_checksrc) \
308 $(call cmd_and_fixdep,cc_o_c) \
310 $(call echo-cmd,objtool) $(cmd_objtool) \
311 $(cmd_modversions_c) \
312 $(call echo-cmd,ubuntu-retpoline) $(cmd_ubuntu_retpoline) \
313 $(call echo-cmd,record_mcount) $(cmd_record_mcount)
317 $(call cmd_and_fixdep,as_o_S) \
318 $(call echo-cmd,objtool) $(cmd_objtool) \
319 $(cmd_modversions_S) \
320 $(call echo-cmd,ubuntu-retpoline) $(cmd_ubuntu_retpoline)
323 # List module undefined symbols (or empty line if not enabled)
324 ifdef CONFIG_TRIM_UNUSED_KSYMS
325 cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
327 cmd_undef_syms = echo
330 # Built-in and composite module parts
331 $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
332 $(call cmd,force_checksrc)
333 $(call cmd,force_check_kmsg)
334 $(call if_changed_rule,cc_o_c)
336 # Single-part modules are special since we need to mark them in $(MODVERDIR)
338 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
339 $(call cmd,force_checksrc)
340 $(call cmd,force_check_kmsg)
341 $(call if_changed_rule,cc_o_c)
342 @{ echo $(@:.o=.ko); echo $@; \
343 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
345 quiet_cmd_cc_lst_c = MKLST $@
346 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
347 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
348 System.map $(OBJDUMP) > $@
350 $(obj)/%.lst: $(src)/%.c FORCE
351 $(call if_changed_dep,cc_lst_c)
353 # Compile assembler sources (.S)
354 # ---------------------------------------------------------------------------
356 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
358 $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
359 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
361 # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
362 # or a file that it includes, in order to get versioned symbols. We build a
363 # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
364 # the .S file (with trailing ';'), and run genksyms on that, to extract vers.
366 # This is convoluted. The .S file must first be preprocessed to run guards and
367 # expand names, then the resulting exports must be constructed into plain
368 # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
369 # to make the genksyms input.
371 # These mirror gensymtypes_c and co above, keep them in synch.
372 cmd_gensymtypes_S = \
373 (echo "\#include <linux/kernel.h>" ; \
374 echo "\#include <asm/asm-prototypes.h>" ; \
375 $(CPP) $(a_flags) $< | \
376 grep "\<___EXPORT_SYMBOL\>" | \
377 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
378 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
379 $(GENKSYMS) $(if $(1), -T $(2)) \
380 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
381 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
382 $(if $(KBUILD_PRESERVE),-p) \
383 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
385 quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
386 cmd_cc_symtypes_S = \
388 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
389 test -s $@ || rm -f $@
391 $(obj)/%.symtypes : $(src)/%.S FORCE
392 $(call cmd,cc_symtypes_S)
395 quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
396 cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
398 $(obj)/%.s: $(src)/%.S FORCE
399 $(call if_changed_dep,cpp_s_S)
401 quiet_cmd_as_o_S = AS $(quiet_modtag) $@
403 ifndef CONFIG_MODVERSIONS
404 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
408 ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
410 ifeq ($(ASM_PROTOTYPES),)
411 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
415 # versioning matches the C process described above, with difference that
416 # we parse asm-prototypes.h C header to get function definitions.
418 cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
420 cmd_modversions_S = \
421 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
422 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
423 > $(@D)/.tmp_$(@F:.o=.ver); \
425 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
426 -T $(@D)/.tmp_$(@F:.o=.ver); \
427 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
429 mv -f $(@D)/.tmp_$(@F) $@; \
434 $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
435 $(call if_changed_rule,as_o_S)
437 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
438 targets += $(extra-y) $(MAKECMDGOALS) $(always)
440 # Linker scripts preprocessor (.lds.S -> .lds)
441 # ---------------------------------------------------------------------------
442 quiet_cmd_cpp_lds_S = LDS $@
443 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
444 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
446 $(obj)/%.lds: $(src)/%.lds.S FORCE
447 $(call if_changed_dep,cpp_lds_S)
450 # ---------------------------------------------------------------------------
451 quiet_cmd_asn1_compiler = ASN.1 $@
452 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
453 $(subst .h,.c,$@) $(subst .c,.h,$@)
455 .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
457 $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
458 $(call cmd,asn1_compiler)
460 # Build the compiled-in targets
461 # ---------------------------------------------------------------------------
463 # To build objects in subdirs, we need to descend into the directories
464 $(sort $(subdir-obj-y)): $(subdir-ym) ;
467 # Rule to compile a set of .o files into one .o file
471 ifdef CONFIG_THIN_ARCHIVES
472 cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
473 cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
474 quiet_cmd_link_o_target = AR $@
476 cmd_make_builtin = $(LD) $(ld_flags) -r -o
477 cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
478 quiet_cmd_link_o_target = LD $@
481 # If the list of objects to link is empty, just create an empty built-in.o
482 cmd_link_o_target = $(if $(strip $(obj-y)),\
483 $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
485 $(cmd_make_empty_builtin) $@)
487 $(builtin-target): $(obj-y) FORCE
488 $(call if_changed,link_o_target)
490 targets += $(builtin-target)
491 endif # builtin-target
494 # Rule to create modules.order file
496 # Create commands to either record .ko file or cat modules.order from
499 $(foreach m, $(modorder), \
500 $(if $(filter %/modules.order, $m), \
501 cat $m;, echo kernel/$m;))
503 $(modorder-target): $(subdir-ym) FORCE
504 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
507 # Rule to compile a set of .o files into one .a file
510 quiet_cmd_link_l_target = AR $@
512 ifdef CONFIG_THIN_ARCHIVES
513 cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
515 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
518 $(lib-target): $(lib-y) FORCE
519 $(call if_changed,link_l_target)
521 targets += $(lib-target)
523 dummy-object = $(obj)/.lib_exports.o
524 ksyms-lds = $(dot-target).lds
525 ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
526 ref_prefix = EXTERN(_
531 quiet_cmd_export_list = EXPORTS $@
532 cmd_export_list = $(OBJDUMP) -h $< | \
533 sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\
534 rm -f $(dummy-object);\
535 echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
536 $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
537 rm $(dummy-object) $(ksyms-lds)
539 $(obj)/lib-ksyms.o: $(lib-target) FORCE
540 $(call if_changed,export_list)
542 targets += $(obj)/lib-ksyms.o
547 # Rule to link composite objects
549 # Composite objects are specified in kbuild makefile as follows:
550 # <composite-object>-objs := <list of .o files>
552 # <composite-object>-y := <list of .o files>
554 # <composite-object>-m := <list of .o files>
555 # The -m syntax only works if <composite object> is a module
557 $(filter $(addprefix $(obj)/, \
558 $($(subst $(obj)/,,$(@:.o=-objs))) \
559 $($(subst $(obj)/,,$(@:.o=-y))) \
560 $($(subst $(obj)/,,$(@:.o=-m)))), $^)
562 cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
564 ifdef CONFIG_THIN_ARCHIVES
565 quiet_cmd_link_multi-y = AR $@
566 cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps)
568 quiet_cmd_link_multi-y = LD $@
569 cmd_link_multi-y = $(cmd_link_multi-link)
572 quiet_cmd_link_multi-m = LD [M] $@
573 cmd_link_multi-m = $(cmd_link_multi-link)
575 $(multi-used-y): FORCE
576 $(call if_changed,link_multi-y)
577 $(call multi_depend, $(multi-used-y), .o, -objs -y)
579 $(multi-used-m): FORCE
580 $(call if_changed,link_multi-m)
581 @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
582 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
583 $(call multi_depend, $(multi-used-m), .o, -objs -y -m)
585 targets += $(multi-used-y) $(multi-used-m)
586 targets := $(filter-out $(PHONY), $(targets))
589 ifneq ($(KBUILD_KMSG_CHECK),0)
590 ifeq ($(KBUILD_KMSG_CHECK),2)
592 quiet_cmd_force_check_kmsg = KMSG_PRINT $<
593 $(shell [ -d $(objtree)/man ] || mkdir -p $(objtree)/man)
596 quiet_cmd_force_check_kmsg = KMSG_CHECK $<
598 cmd_force_check_kmsg = $(KMSG_CHECK) $(kmsg_cmd) $(CC) $(c_flags) $< ;
602 # ---------------------------------------------------------------------------
604 PHONY += $(subdir-ym)
606 $(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1)
608 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
609 # ---------------------------------------------------------------------------
615 # Read all saved command lines and dependencies for the $(targets) we
616 # may be building above, using $(if_changed{,_dep}). As an
617 # optimization, we don't need to read them if the target does not
618 # exist, we will rebuild anyway in that case.
620 cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
622 ifneq ($(cmd_files),)
626 ifneq ($(KBUILD_SRC),)
627 # Create directories for object files if they do not exist
628 obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets))))
629 # If cmd_files exist, their directories apparently exist. Skip mkdir.
630 exist-dirs := $(sort $(patsubst %/,%, $(dir $(cmd_files))))
631 obj-dirs := $(strip $(filter-out $(exist-dirs), $(obj-dirs)))
633 $(shell mkdir -p $(obj-dirs))
637 # Declare the contents of the .PHONY variable as phony. We keep that
638 # information in a variable se we can use it in if_changed and friends.