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))
43include $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile)
44
45include $(srctree)/scripts/Makefile.lib
46
47# Do not include hostprogs rules unless needed.
48# $(sort ...) is used here to remove duplicated words and excessive spaces.
49hostprogs := $(sort $(hostprogs))
50ifneq ($(hostprogs),)
51include $(srctree)/scripts/Makefile.host
52endif
53
54# Do not include userprogs rules unless needed.
55# $(sort ...) is used here to remove duplicated words and excessive spaces.
56userprogs := $(sort $(userprogs))
57ifneq ($(userprogs),)
58include $(srctree)/scripts/Makefile.userprogs
59endif
60
61ifndef obj
62$(warning kbuild: Makefile.build is included improperly)
63endif
64
65ifeq ($(need-modorder),)
66ifneq ($(obj-m),)
67$(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)
68$(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)
69endif
70endif
71
72# ===========================================================================
73
74# subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...)
75subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y)))
76subdir-modorder := $(sort $(filter %/modules.order, $(obj-m)))
77
78targets-for-builtin := $(extra-y)
79
80ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
81targets-for-builtin += $(obj)/lib.a
82endif
83
84ifdef need-builtin
85targets-for-builtin += $(obj)/built-in.a
86endif
87
88targets-for-modules := $(patsubst %.o, %.mod, $(filter %.o, $(obj-m)))
89
90ifneq ($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT),)
91targets-for-modules += $(patsubst %.o, %.prelink.o, $(filter %.o, $(obj-m)))
92endif
93
94ifdef need-modorder
95targets-for-modules += $(obj)/modules.order
96endif
97
98targets += $(targets-for-builtin) $(targets-for-modules)
99
100# Linus' kernel sanity checking tool
101ifeq ($(KBUILD_CHECKSRC),1)
102 quiet_cmd_checksrc = CHECK $<
103 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
104else ifeq ($(KBUILD_CHECKSRC),2)
105 quiet_cmd_force_checksrc = CHECK $<
106 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
107endif
108
109ifneq ($(KBUILD_EXTRA_WARN),)
110 cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
111endif
112
113# Compile C sources (.c)
114# ---------------------------------------------------------------------------
115
116quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
117 cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $<
118
119$(obj)/%.s: $(src)/%.c FORCE
120 $(call if_changed_dep,cc_s_c)
121
122quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
123cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
124
125$(obj)/%.i: $(src)/%.c FORCE
126 $(call if_changed_dep,cpp_i_c)
127
128# These mirror gensymtypes_S and co below, keep them in synch.
129cmd_gensymtypes_c = \
130 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
131 scripts/genksyms/genksyms $(if $(1), -T $(2)) \
132 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
133 $(if $(KBUILD_PRESERVE),-p) \
134 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
135
136quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
137cmd_cc_symtypes_c = \
138 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
139 test -s $@ || rm -f $@
140
141$(obj)/%.symtypes : $(src)/%.c FORCE
142 $(call cmd,cc_symtypes_c)
143
144# LLVM assembly
145# Generate .ll files from .c
146quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
147 cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
148
149$(obj)/%.ll: $(src)/%.c FORCE
150 $(call if_changed_dep,cc_ll_c)
151
152# C (.c) files
153# The C file is compiled and updated dependency information is generated.
154# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
155
156quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
157 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< $(cmd_objtool)
158
159ifdef CONFIG_MODVERSIONS
160# When module versioning is enabled the following steps are executed:
161# o compile a <file>.o from <file>.c
162# o if <file>.o doesn't contain a __ksymtab version, i.e. does
163# not export symbols, it's done.
164# o otherwise, we calculate symbol versions using the good old
165# genksyms on the preprocessed source and postprocess them in a way
166# that they are usable as a linker script
167# o generate .tmp_<file>.o from <file>.o using the linker to
168# replace the unresolved symbols __crc_exported_symbol with
169# the actual value of the checksum generated by genksyms
170# o remove .tmp_<file>.o to <file>.o
171
172ifdef CONFIG_LTO_CLANG
173# Generate .o.symversions files for each .o with exported symbols, and link these
174# to the kernel and/or modules at the end.
175cmd_modversions_c = \
176 if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \
177 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
178 > $@.symversions; \
179 else \
180 rm -f $@.symversions; \
181 fi;
182else
183cmd_modversions_c = \
184 if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
185 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
186 > $(@D)/.tmp_$(@F:.o=.ver); \
187 \
188 $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
189 -T $(@D)/.tmp_$(@F:.o=.ver); \
190 mv -f $(@D)/.tmp_$(@F) $@; \
191 rm -f $(@D)/.tmp_$(@F:.o=.ver); \
192 fi
193endif
194endif
195
196ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
197# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
198ifdef BUILD_C_RECORDMCOUNT
199ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
200 RECORDMCOUNT_FLAGS = -w
201endif
202# Due to recursion, we must skip empty.o.
203# The empty.o file is created in the make process in order to determine
204# the target endianness and word size. It is made before all other C
205# files, including recordmcount.
206sub_cmd_record_mcount = \
207 if [ $(@) != "scripts/mod/empty.o" ]; then \
208 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
209 fi;
210recordmcount_source := $(srctree)/scripts/recordmcount.c \
211 $(srctree)/scripts/recordmcount.h
212else
213sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
214 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
215 "$(if $(CONFIG_64BIT),64,32)" \
216 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
217 "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
218 "$(if $(part-of-module),1,0)" "$(@)";
219recordmcount_source := $(srctree)/scripts/recordmcount.pl
220endif # BUILD_C_RECORDMCOUNT
221cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \
222 $(sub_cmd_record_mcount))
223endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
224
225ifdef CONFIG_STACK_VALIDATION
226
227objtool := $(objtree)/tools/objtool/objtool
228
229objtool_args = \
230 $(if $(CONFIG_UNWINDER_ORC),orc generate,check) \
231 $(if $(part-of-module), --module) \
232 $(if $(CONFIG_X86_KERNEL_IBT), --lto --ibt) \
233 $(if $(CONFIG_FRAME_POINTER),, --no-fp) \
234 $(if $(CONFIG_GCOV_KERNEL)$(CONFIG_LTO_CLANG), --no-unreachable)\
235 $(if $(CONFIG_RETPOLINE), --retpoline) \
236 $(if $(CONFIG_X86_SMAP), --uaccess) \
237 $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount) \
238 $(if $(CONFIG_SLS), --sls)
239
240cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@)
241cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
242
243endif # CONFIG_STACK_VALIDATION
244
245ifneq ($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT),)
246
247# Skip objtool for LLVM bitcode
248$(obj)/%.o: objtool-enabled :=
249
250else
251
252# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
253# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
254# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
255
256$(obj)/%.o: objtool-enabled = $(if $(filter-out y%, \
257 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n),y)
258
259endif
260
261ifdef CONFIG_TRIM_UNUSED_KSYMS
262cmd_gen_ksymdeps = \
263 $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
264
265# List module undefined symbols
266undefined_syms = $(NM) $< | $(AWK) '$$1 == "U" { printf("%s%s", x++ ? " " : "", $$2) }';
267endif
268
269define rule_cc_o_c
270 $(call cmd_and_fixdep,cc_o_c)
271 $(call cmd,gen_ksymdeps)
272 $(call cmd,checksrc)
273 $(call cmd,checkdoc)
274 $(call cmd,gen_objtooldep)
275 $(call cmd,modversions_c)
276 $(call cmd,record_mcount)
277endef
278
279define rule_as_o_S
280 $(call cmd_and_fixdep,as_o_S)
281 $(call cmd,gen_ksymdeps)
282 $(call cmd,gen_objtooldep)
283 $(call cmd,modversions_S)
284endef
285
286# Built-in and composite module parts
287$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
288 $(call if_changed_rule,cc_o_c)
289 $(call cmd,force_checksrc)
290
291ifneq ($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT),)
292# Module .o files may contain LLVM bitcode, compile them into native code
293# before ELF processing
294quiet_cmd_cc_prelink_modules = LD [M] $@
295 cmd_cc_prelink_modules = \
296 $(LD) $(ld_flags) -r -o $@ \
297 $(shell [ -s $(@:.prelink.o=.o.symversions) ] && \
298 echo -T $(@:.prelink.o=.o.symversions)) \
299 --whole-archive $(filter-out FORCE,$^) \
300 $(cmd_objtool)
301
302# objtool was skipped for LLVM bitcode, run it now that we have compiled
303# modules into native code
304$(obj)/%.prelink.o: objtool-enabled = y
305$(obj)/%.prelink.o: part-of-module := y
306
307$(obj)/%.prelink.o: $(obj)/%.o FORCE
308 $(call if_changed,cc_prelink_modules)
309endif
310
311cmd_mod = { \
312 echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \
313 $(undefined_syms) echo; \
314 } > $@
315
316$(obj)/%.mod: $(obj)/%$(mod-prelink-ext).o FORCE
317 $(call if_changed,mod)
318
319quiet_cmd_cc_lst_c = MKLST $@
320 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
321 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
322 System.map $(OBJDUMP) > $@
323
324$(obj)/%.lst: $(src)/%.c FORCE
325 $(call if_changed_dep,cc_lst_c)
326
327# Compile assembler sources (.S)
328# ---------------------------------------------------------------------------
329
330# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
331# or a file that it includes, in order to get versioned symbols. We build a
332# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
333# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
334#
335# This is convoluted. The .S file must first be preprocessed to run guards and
336# expand names, then the resulting exports must be constructed into plain
337# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
338# to make the genksyms input.
339#
340# These mirror gensymtypes_c and co above, keep them in synch.
341cmd_gensymtypes_S = \
342 { echo "\#include <linux/kernel.h>" ; \
343 echo "\#include <asm/asm-prototypes.h>" ; \
344 $(CPP) $(a_flags) $< | \
345 grep "\<___EXPORT_SYMBOL\>" | \
346 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \
347 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
348 scripts/genksyms/genksyms $(if $(1), -T $(2)) \
349 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
350 $(if $(KBUILD_PRESERVE),-p) \
351 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
352
353quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
354cmd_cc_symtypes_S = \
355 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
356 test -s $@ || rm -f $@
357
358$(obj)/%.symtypes : $(src)/%.S FORCE
359 $(call cmd,cc_symtypes_S)
360
361
362quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
363cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
364
365$(obj)/%.s: $(src)/%.S FORCE
366 $(call if_changed_dep,cpp_s_S)
367
368quiet_cmd_as_o_S = AS $(quiet_modtag) $@
369 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool)
370
371ifdef CONFIG_ASM_MODVERSIONS
372
373# versioning matches the C process described above, with difference that
374# we parse asm-prototypes.h C header to get function definitions.
375
376cmd_modversions_S = \
377 if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
378 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
379 > $(@D)/.tmp_$(@F:.o=.ver); \
380 \
381 $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
382 -T $(@D)/.tmp_$(@F:.o=.ver); \
383 mv -f $(@D)/.tmp_$(@F) $@; \
384 rm -f $(@D)/.tmp_$(@F:.o=.ver); \
385 fi
386endif
387
388$(obj)/%.o: $(src)/%.S FORCE
389 $(call if_changed_rule,as_o_S)
390
391targets += $(filter-out $(subdir-builtin), $(real-obj-y))
392targets += $(filter-out $(subdir-modorder), $(real-obj-m))
393targets += $(real-dtb-y) $(lib-y) $(always-y) $(MAKECMDGOALS)
394
395# Linker scripts preprocessor (.lds.S -> .lds)
396# ---------------------------------------------------------------------------
397quiet_cmd_cpp_lds_S = LDS $@
398 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
399 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
400
401$(obj)/%.lds: $(src)/%.lds.S FORCE
402 $(call if_changed_dep,cpp_lds_S)
403
404# ASN.1 grammar
405# ---------------------------------------------------------------------------
406quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch]
407 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
408 $(basename $@).c $(basename $@).h
409
410$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
411 $(call cmd,asn1_compiler)
412
413# Build the compiled-in targets
414# ---------------------------------------------------------------------------
415
416# To build objects in subdirs, we need to descend into the directories
417$(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ;
418$(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ;
419
420# combine symversions for later processing
421ifeq ($(CONFIG_LTO_CLANG) $(CONFIG_MODVERSIONS),y y)
422 cmd_update_lto_symversions = \
423 rm -f $@.symversions \
424 $(foreach n, $(filter-out FORCE,$^), \
425 $(if $(shell test -s $(n).symversions && echo y), \
426 ; cat $(n).symversions >> $@.symversions))
427else
428 cmd_update_lto_symversions = echo >/dev/null
429endif
430
431#
432# Rule to compile a set of .o files into one .a file (without symbol table)
433#
434
435quiet_cmd_ar_builtin = AR $@
436 cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs)
437
438quiet_cmd_ar_and_symver = AR $@
439 cmd_ar_and_symver = $(cmd_update_lto_symversions); $(cmd_ar_builtin)
440
441$(obj)/built-in.a: $(real-obj-y) FORCE
442 $(call if_changed,ar_and_symver)
443
444#
445# Rule to create modules.order file
446#
447# Create commands to either record .ko file or cat modules.order from
448# a subdirectory
449# Add $(obj-m) as the prerequisite to avoid updating the timestamp of
450# modules.order unless contained modules are updated.
451
452cmd_modules_order = { $(foreach m, $(real-prereqs), \
453 $(if $(filter %/modules.order, $m), cat $m, echo $(patsubst %.o,%.ko,$m));) :; } \
454 | $(AWK) '!x[$$0]++' - > $@
455
456$(obj)/modules.order: $(obj-m) FORCE
457 $(call if_changed,modules_order)
458
459#
460# Rule to compile a set of .o files into one .a file (with symbol table)
461#
462quiet_cmd_ar_lib = AR $@
463 cmd_ar_lib = $(cmd_update_lto_symversions); $(cmd_ar)
464
465$(obj)/lib.a: $(lib-y) FORCE
466 $(call if_changed,ar_lib)
467
468# NOTE:
469# Do not replace $(filter %.o,^) with $(real-prereqs). When a single object
470# module is turned into a multi object module, $^ will contain header file
471# dependencies recorded in the .*.cmd file.
472ifneq ($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT),)
473quiet_cmd_link_multi-m = AR [M] $@
474cmd_link_multi-m = \
475 $(cmd_update_lto_symversions); \
476 rm -f $@; \
477 $(AR) cDPrsT $@ $(filter %.o,$^)
478else
479quiet_cmd_link_multi-m = LD [M] $@
480 cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^)
481endif
482
483$(multi-obj-m): FORCE
484 $(call if_changed,link_multi-m)
485$(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
486
487targets += $(multi-obj-m)
488targets := $(filter-out $(PHONY), $(targets))
489
490# Add intermediate targets:
491# When building objects with specific suffix patterns, add intermediate
492# targets that the final targets are derived from.
493intermediate_targets = $(foreach sfx, $(2), \
494 $(patsubst %$(strip $(1)),%$(sfx), \
495 $(filter %$(strip $(1)), $(targets))))
496# %.asn1.o <- %.asn1.[ch] <- %.asn1
497# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
498# %.lex.o <- %.lex.c <- %.l
499# %.tab.o <- %.tab.[ch] <- %.y
500targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
501 $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
502 $(call intermediate_targets, .lex.o, .lex.c) \
503 $(call intermediate_targets, .tab.o, .tab.c .tab.h)
504
505# Build
506# ---------------------------------------------------------------------------
507
508ifdef single-build
509
510KBUILD_SINGLE_TARGETS := $(filter $(obj)/%, $(KBUILD_SINGLE_TARGETS))
511
512curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \
513 $(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x))))
514
515# Handle single targets without any rule: show "Nothing to be done for ..." or
516# "No rule to make target ..." depending on whether the target exists.
517unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \
518 $(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS)))
519
520single-subdirs := $(foreach d, $(subdir-ym), \
521 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
522
523__build: $(curdir-single) $(single-subdirs)
524ifneq ($(unknown-single),)
525 $(Q)$(MAKE) -f /dev/null $(unknown-single)
526endif
527 @:
528
529ifeq ($(curdir-single),)
530# Nothing to do in this directory. Do not include any .*.cmd file for speed-up
531targets :=
532else
533targets += $(curdir-single)
534endif
535
536else
537
538__build: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \
539 $(if $(KBUILD_MODULES), $(targets-for-modules)) \
540 $(subdir-ym) $(always-y)
541 @:
542
543endif
544
545# Descending
546# ---------------------------------------------------------------------------
547
548PHONY += $(subdir-ym)
549$(subdir-ym):
550 $(Q)$(MAKE) $(build)=$@ \
551 $(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \
552 need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \
553 need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1)
554
555# Add FORCE to the prequisites of a target to force it to be always rebuilt.
556# ---------------------------------------------------------------------------
557
558PHONY += FORCE
559
560FORCE:
561
562# Read all saved command lines and dependencies for the $(targets) we
563# may be building above, using $(if_changed{,_dep}). As an
564# optimization, we don't need to read them if the target does not
565# exist, we will rebuild anyway in that case.
566
567existing-targets := $(wildcard $(sort $(targets)))
568
569-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
570
571# Create directories for object files if they do not exist
572obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets))))
573# If targets exist, their directories apparently exist. Skip mkdir.
574existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
575obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
576ifneq ($(obj-dirs),)
577$(shell mkdir -p $(obj-dirs))
578endif
579
580.PHONY: $(PHONY)