Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1# ==========================================================================
2# Building
3# ==========================================================================
4
5src := $(obj)
6
7PHONY := __build
8__build:
9
10# Init all relevant variables used in kbuild files so
11# 1) they have correct type
12# 2) they do not inherit any value from the environment
13obj-y :=
14obj-m :=
15lib-y :=
16lib-m :=
17always :=
18targets :=
19subdir-y :=
20subdir-m :=
21EXTRA_AFLAGS :=
22EXTRA_CFLAGS :=
23EXTRA_CPPFLAGS :=
24EXTRA_LDFLAGS :=
25asflags-y :=
26ccflags-y :=
27cppflags-y :=
28ldflags-y :=
29
30subdir-asflags-y :=
31subdir-ccflags-y :=
32
33# Read auto.conf if it exists, otherwise ignore
34-include include/config/auto.conf
35
36include scripts/Kbuild.include
37
38# For backward compatibility check that these variables do not change
39save-cflags := $(CFLAGS)
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 $(kbuild-file)
45
46# If the save-* variables changed error out
47ifeq ($(KBUILD_NOPEDANTIC),)
48 ifneq ("$(save-cflags)","$(CFLAGS)")
49 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
50 endif
51endif
52
53include scripts/Makefile.lib
54
55ifdef host-progs
56ifneq ($(hostprogs-y),$(host-progs))
57$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
58hostprogs-y += $(host-progs)
59endif
60endif
61
62# Do not include host rules unless needed
63ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
64include scripts/Makefile.host
65endif
66
67ifneq ($(KBUILD_SRC),)
68# Create output directory if not already present
69_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
70
71# Create directories for object files if directory does not exist
72# Needed when obj-y := dir/file.o syntax is used
73_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
74endif
75
76ifndef obj
77$(warning kbuild: Makefile.build is included improperly)
78endif
79
80# ===========================================================================
81
82ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
83lib-target := $(obj)/lib.a
84obj-y += $(obj)/lib-ksyms.o
85endif
86
87ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
88builtin-target := $(obj)/built-in.o
89endif
90
91modorder-target := $(obj)/modules.order
92
93# We keep a list of all modules in $(MODVERDIR)
94
95__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
96 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
97 $(subdir-ym) $(always)
98 @:
99
100# Linus' kernel sanity checking tool
101ifneq ($(KBUILD_CHECKSRC),0)
102 ifeq ($(KBUILD_CHECKSRC),2)
103 quiet_cmd_force_checksrc = CHECK $<
104 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
105 else
106 quiet_cmd_checksrc = CHECK $<
107 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
108 endif
109endif
110
111# Do section mismatch analysis for each module/built-in.o
112ifdef CONFIG_DEBUG_SECTION_MISMATCH
113 cmd_secanalysis = ; scripts/mod/modpost $@
114endif
115
116# Compile C sources (.c)
117# ---------------------------------------------------------------------------
118
119# Default is built-in, unless we know otherwise
120modkern_cflags = \
121 $(if $(part-of-module), \
122 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
123 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
124quiet_modtag := $(empty) $(empty)
125
126$(real-objs-m) : part-of-module := y
127$(real-objs-m:.o=.i) : part-of-module := y
128$(real-objs-m:.o=.s) : part-of-module := y
129$(real-objs-m:.o=.lst): part-of-module := y
130
131$(real-objs-m) : quiet_modtag := [M]
132$(real-objs-m:.o=.i) : quiet_modtag := [M]
133$(real-objs-m:.o=.s) : quiet_modtag := [M]
134$(real-objs-m:.o=.lst): quiet_modtag := [M]
135
136$(obj-m) : quiet_modtag := [M]
137
138# Default for not multi-part modules
139modname = $(basetarget)
140
141$(multi-objs-m) : modname = $(modname-multi)
142$(multi-objs-m:.o=.i) : modname = $(modname-multi)
143$(multi-objs-m:.o=.s) : modname = $(modname-multi)
144$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
145$(multi-objs-y) : modname = $(modname-multi)
146$(multi-objs-y:.o=.i) : modname = $(modname-multi)
147$(multi-objs-y:.o=.s) : modname = $(modname-multi)
148$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
149
150quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
151cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
152
153$(obj)/%.s: $(src)/%.c FORCE
154 $(call if_changed_dep,cc_s_c)
155
156quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
157cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
158
159$(obj)/%.i: $(src)/%.c FORCE
160 $(call if_changed_dep,cpp_i_c)
161
162# These mirror gensymtypes_S and co below, keep them in synch.
163cmd_gensymtypes_c = \
164 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
165 $(GENKSYMS) $(if $(1), -T $(2)) \
166 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
167 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
168 $(if $(KBUILD_PRESERVE),-p) \
169 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
170
171quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
172cmd_cc_symtypes_c = \
173 set -e; \
174 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
175 test -s $@ || rm -f $@
176
177$(obj)/%.symtypes : $(src)/%.c FORCE
178 $(call cmd,cc_symtypes_c)
179
180# LLVM assembly
181# Generate .ll files from .c
182quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
183 cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
184
185$(obj)/%.ll: $(src)/%.c FORCE
186 $(call if_changed_dep,cc_ll_c)
187
188# C (.c) files
189# The C file is compiled and updated dependency information is generated.
190# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
191
192quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
193
194ifndef CONFIG_MODVERSIONS
195cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
196
197else
198# When module versioning is enabled the following steps are executed:
199# o compile a .tmp_<file>.o from <file>.c
200# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
201# not export symbols, we just rename .tmp_<file>.o to <file>.o and
202# are done.
203# o otherwise, we calculate symbol versions using the good old
204# genksyms on the preprocessed source and postprocess them in a way
205# that they are usable as a linker script
206# o generate <file>.o from .tmp_<file>.o using the linker to
207# replace the unresolved symbols __crc_exported_symbol with
208# the actual value of the checksum generated by genksyms
209
210cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
211
212cmd_modversions_c = \
213 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
214 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
215 > $(@D)/.tmp_$(@F:.o=.ver); \
216 \
217 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
218 -T $(@D)/.tmp_$(@F:.o=.ver); \
219 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
220 else \
221 mv -f $(@D)/.tmp_$(@F) $@; \
222 fi;
223endif
224
225ifdef CONFIG_FTRACE_MCOUNT_RECORD
226ifdef BUILD_C_RECORDMCOUNT
227ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
228 RECORDMCOUNT_FLAGS = -w
229endif
230# Due to recursion, we must skip empty.o.
231# The empty.o file is created in the make process in order to determine
232# the target endianness and word size. It is made before all other C
233# files, including recordmcount.
234sub_cmd_record_mcount = \
235 if [ $(@) != "scripts/mod/empty.o" ]; then \
236 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
237 fi;
238recordmcount_source := $(srctree)/scripts/recordmcount.c \
239 $(srctree)/scripts/recordmcount.h
240else
241sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
242 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
243 "$(if $(CONFIG_64BIT),64,32)" \
244 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
245 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
246 "$(if $(part-of-module),1,0)" "$(@)";
247recordmcount_source := $(srctree)/scripts/recordmcount.pl
248endif # BUILD_C_RECORDMCOUNT
249cmd_record_mcount = \
250 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
251 "$(CC_FLAGS_FTRACE)" ]; then \
252 $(sub_cmd_record_mcount) \
253 fi;
254endif # CONFIG_FTRACE_MCOUNT_RECORD
255
256ifdef CONFIG_STACK_VALIDATION
257ifneq ($(SKIP_STACK_VALIDATION),1)
258
259__objtool_obj := $(objtree)/tools/objtool/objtool
260
261objtool_args = $(if $(CONFIG_ORC_UNWINDER),orc generate,check)
262
263ifndef CONFIG_FRAME_POINTER
264objtool_args += --no-fp
265endif
266ifdef CONFIG_GCOV_KERNEL
267objtool_args += --no-unreachable
268endif
269
270# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
271# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
272# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
273cmd_objtool = $(if $(patsubst y%,, \
274 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
275 $(__objtool_obj) $(objtool_args) "$(@)";)
276objtool_obj = $(if $(patsubst y%,, \
277 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
278 $(__objtool_obj))
279
280endif # SKIP_STACK_VALIDATION
281endif # CONFIG_STACK_VALIDATION
282
283# Rebuild all objects when objtool changes, or is enabled/disabled.
284objtool_dep = $(objtool_obj) \
285 $(wildcard include/config/orc/unwinder.h \
286 include/config/stack/validation.h)
287
288define rule_cc_o_c
289 $(call echo-cmd,checksrc) $(cmd_checksrc) \
290 $(call cmd_and_fixdep,cc_o_c) \
291 $(cmd_modversions_c) \
292 $(call echo-cmd,objtool) $(cmd_objtool) \
293 $(call echo-cmd,record_mcount) $(cmd_record_mcount)
294endef
295
296define rule_as_o_S
297 $(call cmd_and_fixdep,as_o_S) \
298 $(cmd_modversions_S) \
299 $(call echo-cmd,objtool) $(cmd_objtool)
300endef
301
302# List module undefined symbols (or empty line if not enabled)
303ifdef CONFIG_TRIM_UNUSED_KSYMS
304cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
305else
306cmd_undef_syms = echo
307endif
308
309# Built-in and composite module parts
310$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
311 $(call cmd,force_checksrc)
312 $(call if_changed_rule,cc_o_c)
313
314# Single-part modules are special since we need to mark them in $(MODVERDIR)
315
316$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
317 $(call cmd,force_checksrc)
318 $(call if_changed_rule,cc_o_c)
319 @{ echo $(@:.o=.ko); echo $@; \
320 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
321
322quiet_cmd_cc_lst_c = MKLST $@
323 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
324 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
325 System.map $(OBJDUMP) > $@
326
327$(obj)/%.lst: $(src)/%.c FORCE
328 $(call if_changed_dep,cc_lst_c)
329
330# Compile assembler sources (.S)
331# ---------------------------------------------------------------------------
332
333modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
334
335$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
336$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
337
338# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
339# or a file that it includes, in order to get versioned symbols. We build a
340# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
341# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
342#
343# This is convoluted. The .S file must first be preprocessed to run guards and
344# expand names, then the resulting exports must be constructed into plain
345# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
346# to make the genksyms input.
347#
348# These mirror gensymtypes_c and co above, keep them in synch.
349cmd_gensymtypes_S = \
350 (echo "\#include <linux/kernel.h>" ; \
351 echo "\#include <asm/asm-prototypes.h>" ; \
352 $(CPP) $(a_flags) $< | \
353 grep "\<___EXPORT_SYMBOL\>" | \
354 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
355 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
356 $(GENKSYMS) $(if $(1), -T $(2)) \
357 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
358 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
359 $(if $(KBUILD_PRESERVE),-p) \
360 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
361
362quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
363cmd_cc_symtypes_S = \
364 set -e; \
365 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
366 test -s $@ || rm -f $@
367
368$(obj)/%.symtypes : $(src)/%.S FORCE
369 $(call cmd,cc_symtypes_S)
370
371
372quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
373cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
374
375$(obj)/%.s: $(src)/%.S FORCE
376 $(call if_changed_dep,cpp_s_S)
377
378quiet_cmd_as_o_S = AS $(quiet_modtag) $@
379
380ifndef CONFIG_MODVERSIONS
381cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
382
383else
384
385ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
386
387ifeq ($(ASM_PROTOTYPES),)
388cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
389
390else
391
392# versioning matches the C process described above, with difference that
393# we parse asm-prototypes.h C header to get function definitions.
394
395cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
396
397cmd_modversions_S = \
398 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
399 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
400 > $(@D)/.tmp_$(@F:.o=.ver); \
401 \
402 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
403 -T $(@D)/.tmp_$(@F:.o=.ver); \
404 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
405 else \
406 mv -f $(@D)/.tmp_$(@F) $@; \
407 fi;
408endif
409endif
410
411$(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
412 $(call if_changed_rule,as_o_S)
413
414targets += $(real-objs-y) $(real-objs-m) $(lib-y)
415targets += $(extra-y) $(MAKECMDGOALS) $(always)
416
417# Linker scripts preprocessor (.lds.S -> .lds)
418# ---------------------------------------------------------------------------
419quiet_cmd_cpp_lds_S = LDS $@
420 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
421 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
422
423$(obj)/%.lds: $(src)/%.lds.S FORCE
424 $(call if_changed_dep,cpp_lds_S)
425
426# ASN.1 grammar
427# ---------------------------------------------------------------------------
428quiet_cmd_asn1_compiler = ASN.1 $@
429 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
430 $(subst .h,.c,$@) $(subst .c,.h,$@)
431
432.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
433
434$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
435 $(call cmd,asn1_compiler)
436
437# Build the compiled-in targets
438# ---------------------------------------------------------------------------
439
440# To build objects in subdirs, we need to descend into the directories
441$(sort $(subdir-obj-y)): $(subdir-ym) ;
442
443#
444# Rule to compile a set of .o files into one .o file
445#
446ifdef builtin-target
447
448ifdef CONFIG_THIN_ARCHIVES
449 cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
450 cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
451 quiet_cmd_link_o_target = AR $@
452else
453 cmd_make_builtin = $(LD) $(ld_flags) -r -o
454 cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
455 quiet_cmd_link_o_target = LD $@
456endif
457
458# If the list of objects to link is empty, just create an empty built-in.o
459cmd_link_o_target = $(if $(strip $(obj-y)),\
460 $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
461 $(cmd_secanalysis),\
462 $(cmd_make_empty_builtin) $@)
463
464$(builtin-target): $(obj-y) FORCE
465 $(call if_changed,link_o_target)
466
467targets += $(builtin-target)
468endif # builtin-target
469
470#
471# Rule to create modules.order file
472#
473# Create commands to either record .ko file or cat modules.order from
474# a subdirectory
475modorder-cmds = \
476 $(foreach m, $(modorder), \
477 $(if $(filter %/modules.order, $m), \
478 cat $m;, echo kernel/$m;))
479
480$(modorder-target): $(subdir-ym) FORCE
481 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
482
483#
484# Rule to compile a set of .o files into one .a file
485#
486ifdef lib-target
487quiet_cmd_link_l_target = AR $@
488
489ifdef CONFIG_THIN_ARCHIVES
490 cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
491else
492 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
493endif
494
495$(lib-target): $(lib-y) FORCE
496 $(call if_changed,link_l_target)
497
498targets += $(lib-target)
499
500dummy-object = $(obj)/.lib_exports.o
501ksyms-lds = $(dot-target).lds
502ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
503ref_prefix = EXTERN(_
504else
505ref_prefix = EXTERN(
506endif
507
508quiet_cmd_export_list = EXPORTS $@
509cmd_export_list = $(OBJDUMP) -h $< | \
510 sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\
511 rm -f $(dummy-object);\
512 echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
513 $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
514 rm $(dummy-object) $(ksyms-lds)
515
516$(obj)/lib-ksyms.o: $(lib-target) FORCE
517 $(call if_changed,export_list)
518
519targets += $(obj)/lib-ksyms.o
520
521endif
522
523#
524# Rule to link composite objects
525#
526# Composite objects are specified in kbuild makefile as follows:
527# <composite-object>-objs := <list of .o files>
528# or
529# <composite-object>-y := <list of .o files>
530# or
531# <composite-object>-m := <list of .o files>
532# The -m syntax only works if <composite object> is a module
533link_multi_deps = \
534$(filter $(addprefix $(obj)/, \
535$($(subst $(obj)/,,$(@:.o=-objs))) \
536$($(subst $(obj)/,,$(@:.o=-y))) \
537$($(subst $(obj)/,,$(@:.o=-m)))), $^)
538
539cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
540
541ifdef CONFIG_THIN_ARCHIVES
542 quiet_cmd_link_multi-y = AR $@
543 cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps)
544else
545 quiet_cmd_link_multi-y = LD $@
546 cmd_link_multi-y = $(cmd_link_multi-link)
547endif
548
549quiet_cmd_link_multi-m = LD [M] $@
550cmd_link_multi-m = $(cmd_link_multi-link)
551
552$(multi-used-y): FORCE
553 $(call if_changed,link_multi-y)
554$(call multi_depend, $(multi-used-y), .o, -objs -y)
555
556$(multi-used-m): FORCE
557 $(call if_changed,link_multi-m)
558 @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
559 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
560$(call multi_depend, $(multi-used-m), .o, -objs -y -m)
561
562targets += $(multi-used-y) $(multi-used-m)
563
564
565# Descending
566# ---------------------------------------------------------------------------
567
568PHONY += $(subdir-ym)
569$(subdir-ym):
570 $(Q)$(MAKE) $(build)=$@
571
572# Add FORCE to the prequisites of a target to force it to be always rebuilt.
573# ---------------------------------------------------------------------------
574
575PHONY += FORCE
576
577FORCE:
578
579# Read all saved command lines and dependencies for the $(targets) we
580# may be building above, using $(if_changed{,_dep}). As an
581# optimization, we don't need to read them if the target does not
582# exist, we will rebuild anyway in that case.
583
584targets := $(wildcard $(sort $(targets)))
585cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
586
587ifneq ($(cmd_files),)
588 include $(cmd_files)
589endif
590
591# Declare the contents of the .PHONY variable as phony. We keep that
592# information in a variable se we can use it in if_changed and friends.
593
594.PHONY: $(PHONY)