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 := 19targets := 20subdir-y := 21subdir-m := 22EXTRA_AFLAGS := 23EXTRA_CFLAGS := 24EXTRA_CPPFLAGS := 25EXTRA_LDFLAGS := 26asflags-y := 27ccflags-y := 28cppflags-y := 29ldflags-y := 30 31subdir-asflags-y := 32subdir-ccflags-y := 33 34# Read auto.conf if it exists, otherwise ignore 35-include include/config/auto.conf 36 37include scripts/Kbuild.include 38 39# For backward compatibility check that these variables do not change 40save-cflags := $(CFLAGS) 41 42# The filename Kbuild has precedence over Makefile 43kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) 44kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) 45include $(kbuild-file) 46 47# If the save-* variables changed error out 48ifeq ($(KBUILD_NOPEDANTIC),) 49 ifneq ("$(save-cflags)","$(CFLAGS)") 50 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y) 51 endif 52endif 53 54include scripts/Makefile.lib 55 56ifdef host-progs 57ifneq ($(hostprogs-y),$(host-progs)) 58$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) 59hostprogs-y += $(host-progs) 60endif 61endif 62 63# Do not include host rules unless needed 64ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),) 65include scripts/Makefile.host 66endif 67 68ifneq ($(KBUILD_SRC),) 69# Create output directory if not already present 70_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) 71 72# Create directories for object files if directory does not exist 73# Needed when obj-y := dir/file.o syntax is used 74_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) 75endif 76 77ifndef obj 78$(warning kbuild: Makefile.build is included improperly) 79endif 80 81# =========================================================================== 82 83ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) 84lib-target := $(obj)/lib.a 85obj-y += $(obj)/lib-ksyms.o 86endif 87 88ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),) 89builtin-target := $(obj)/built-in.o 90endif 91 92modorder-target := $(obj)/modules.order 93 94# We keep a list of all modules in $(MODVERDIR) 95 96__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ 97 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ 98 $(subdir-ym) $(always) 99 @: 100 101# Linus' kernel sanity checking tool 102ifneq ($(KBUILD_CHECKSRC),0) 103 ifeq ($(KBUILD_CHECKSRC),2) 104 quiet_cmd_force_checksrc = CHECK $< 105 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; 106 else 107 quiet_cmd_checksrc = CHECK $< 108 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; 109 endif 110endif 111 112# Do section mismatch analysis for each module/built-in.o 113ifdef CONFIG_DEBUG_SECTION_MISMATCH 114 cmd_secanalysis = ; scripts/mod/modpost $@ 115endif 116 117# Compile C sources (.c) 118# --------------------------------------------------------------------------- 119 120# Default is built-in, unless we know otherwise 121modkern_cflags = \ 122 $(if $(part-of-module), \ 123 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ 124 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL)) 125quiet_modtag := $(empty) $(empty) 126 127$(real-objs-m) : part-of-module := y 128$(real-objs-m:.o=.i) : part-of-module := y 129$(real-objs-m:.o=.s) : part-of-module := y 130$(real-objs-m:.o=.lst): part-of-module := y 131 132$(real-objs-m) : quiet_modtag := [M] 133$(real-objs-m:.o=.i) : quiet_modtag := [M] 134$(real-objs-m:.o=.s) : quiet_modtag := [M] 135$(real-objs-m:.o=.lst): quiet_modtag := [M] 136 137$(obj-m) : quiet_modtag := [M] 138 139# Default for not multi-part modules 140modname = $(basetarget) 141 142$(multi-objs-m) : modname = $(modname-multi) 143$(multi-objs-m:.o=.i) : modname = $(modname-multi) 144$(multi-objs-m:.o=.s) : modname = $(modname-multi) 145$(multi-objs-m:.o=.lst) : modname = $(modname-multi) 146$(multi-objs-y) : modname = $(modname-multi) 147$(multi-objs-y:.o=.i) : modname = $(modname-multi) 148$(multi-objs-y:.o=.s) : modname = $(modname-multi) 149$(multi-objs-y:.o=.lst) : modname = $(modname-multi) 150 151quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ 152cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $< 153 154$(obj)/%.s: $(src)/%.c FORCE 155 $(call if_changed_dep,cc_s_c) 156 157quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ 158cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< 159 160$(obj)/%.i: $(src)/%.c FORCE 161 $(call if_changed_dep,cpp_i_c) 162 163# These mirror gensymtypes_S and co below, keep them in synch. 164cmd_gensymtypes_c = \ 165 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ 166 $(GENKSYMS) $(if $(1), -T $(2)) \ 167 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ 168 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ 169 $(if $(KBUILD_PRESERVE),-p) \ 170 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) 171 172quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ 173cmd_cc_symtypes_c = \ 174 set -e; \ 175 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \ 176 test -s $@ || rm -f $@ 177 178$(obj)/%.symtypes : $(src)/%.c FORCE 179 $(call cmd,cc_symtypes_c) 180 181# LLVM assembly 182# Generate .ll files from .c 183quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ 184 cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< 185 186$(obj)/%.ll: $(src)/%.c FORCE 187 $(call if_changed_dep,cc_ll_c) 188 189# C (.c) files 190# The C file is compiled and updated dependency information is generated. 191# (See cmd_cc_o_c + relevant part of rule_cc_o_c) 192 193quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ 194 195ifndef CONFIG_MODVERSIONS 196cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 197 198else 199# When module versioning is enabled the following steps are executed: 200# o compile a .tmp_<file>.o from <file>.c 201# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does 202# not export symbols, we just rename .tmp_<file>.o to <file>.o and 203# are done. 204# o otherwise, we calculate symbol versions using the good old 205# genksyms on the preprocessed source and postprocess them in a way 206# that they are usable as a linker script 207# o generate <file>.o from .tmp_<file>.o using the linker to 208# replace the unresolved symbols __crc_exported_symbol with 209# the actual value of the checksum generated by genksyms 210 211cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< 212 213cmd_modversions_c = \ 214 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ 215 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ 216 > $(@D)/.tmp_$(@F:.o=.ver); \ 217 \ 218 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ 219 -T $(@D)/.tmp_$(@F:.o=.ver); \ 220 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ 221 else \ 222 mv -f $(@D)/.tmp_$(@F) $@; \ 223 fi; 224endif 225 226ifdef CONFIG_FTRACE_MCOUNT_RECORD 227ifdef BUILD_C_RECORDMCOUNT 228ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") 229 RECORDMCOUNT_FLAGS = -w 230endif 231# Due to recursion, we must skip empty.o. 232# The empty.o file is created in the make process in order to determine 233# the target endianness and word size. It is made before all other C 234# files, including recordmcount. 235sub_cmd_record_mcount = \ 236 if [ $(@) != "scripts/mod/empty.o" ]; then \ 237 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ 238 fi; 239recordmcount_source := $(srctree)/scripts/recordmcount.c \ 240 $(srctree)/scripts/recordmcount.h 241else 242sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ 243 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ 244 "$(if $(CONFIG_64BIT),64,32)" \ 245 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \ 246 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \ 247 "$(if $(part-of-module),1,0)" "$(@)"; 248recordmcount_source := $(srctree)/scripts/recordmcount.pl 249endif # BUILD_C_RECORDMCOUNT 250cmd_record_mcount = \ 251 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \ 252 "$(CC_FLAGS_FTRACE)" ]; then \ 253 $(sub_cmd_record_mcount) \ 254 fi; 255endif # CONFIG_FTRACE_MCOUNT_RECORD 256 257ifdef CONFIG_STACK_VALIDATION 258ifneq ($(SKIP_STACK_VALIDATION),1) 259 260__objtool_obj := $(objtree)/tools/objtool/objtool 261 262objtool_args = $(if $(CONFIG_ORC_UNWINDER),orc generate,check) 263 264ifndef CONFIG_FRAME_POINTER 265objtool_args += --no-fp 266endif 267ifdef CONFIG_GCOV_KERNEL 268objtool_args += --no-unreachable 269else 270objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable) 271endif 272 273# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory 274# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file 275# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file 276cmd_objtool = $(if $(patsubst y%,, \ 277 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ 278 $(__objtool_obj) $(objtool_args) "$(@)";) 279objtool_obj = $(if $(patsubst y%,, \ 280 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ 281 $(__objtool_obj)) 282 283endif # SKIP_STACK_VALIDATION 284endif # CONFIG_STACK_VALIDATION 285 286# Rebuild all objects when objtool changes, or is enabled/disabled. 287objtool_dep = $(objtool_obj) \ 288 $(wildcard include/config/orc/unwinder.h \ 289 include/config/stack/validation.h) 290 291define rule_cc_o_c 292 $(call echo-cmd,checksrc) $(cmd_checksrc) \ 293 $(call cmd_and_fixdep,cc_o_c) \ 294 $(cmd_modversions_c) \ 295 $(call echo-cmd,objtool) $(cmd_objtool) \ 296 $(call echo-cmd,record_mcount) $(cmd_record_mcount) 297endef 298 299define rule_as_o_S 300 $(call cmd_and_fixdep,as_o_S) \ 301 $(cmd_modversions_S) \ 302 $(call echo-cmd,objtool) $(cmd_objtool) 303endef 304 305# List module undefined symbols (or empty line if not enabled) 306ifdef CONFIG_TRIM_UNUSED_KSYMS 307cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo 308else 309cmd_undef_syms = echo 310endif 311 312# Built-in and composite module parts 313$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE 314 $(call cmd,force_checksrc) 315 $(call if_changed_rule,cc_o_c) 316 317# Single-part modules are special since we need to mark them in $(MODVERDIR) 318 319$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE 320 $(call cmd,force_checksrc) 321 $(call if_changed_rule,cc_o_c) 322 @{ echo $(@:.o=.ko); echo $@; \ 323 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) 324 325quiet_cmd_cc_lst_c = MKLST $@ 326 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ 327 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ 328 System.map $(OBJDUMP) > $@ 329 330$(obj)/%.lst: $(src)/%.c FORCE 331 $(call if_changed_dep,cc_lst_c) 332 333# Compile assembler sources (.S) 334# --------------------------------------------------------------------------- 335 336modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) 337 338$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) 339$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) 340 341# .S file exports must have their C prototypes defined in asm/asm-prototypes.h 342# or a file that it includes, in order to get versioned symbols. We build a 343# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from 344# the .S file (with trailing ';'), and run genksyms on that, to extract vers. 345# 346# This is convoluted. The .S file must first be preprocessed to run guards and 347# expand names, then the resulting exports must be constructed into plain 348# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed 349# to make the genksyms input. 350# 351# These mirror gensymtypes_c and co above, keep them in synch. 352cmd_gensymtypes_S = \ 353 (echo "\#include <linux/kernel.h>" ; \ 354 echo "\#include <asm/asm-prototypes.h>" ; \ 355 $(CPP) $(a_flags) $< | \ 356 grep "\<___EXPORT_SYMBOL\>" | \ 357 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \ 358 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \ 359 $(GENKSYMS) $(if $(1), -T $(2)) \ 360 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ 361 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ 362 $(if $(KBUILD_PRESERVE),-p) \ 363 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) 364 365quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ 366cmd_cc_symtypes_S = \ 367 set -e; \ 368 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \ 369 test -s $@ || rm -f $@ 370 371$(obj)/%.symtypes : $(src)/%.S FORCE 372 $(call cmd,cc_symtypes_S) 373 374 375quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ 376cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< 377 378$(obj)/%.s: $(src)/%.S FORCE 379 $(call if_changed_dep,cpp_s_S) 380 381quiet_cmd_as_o_S = AS $(quiet_modtag) $@ 382 383ifndef CONFIG_MODVERSIONS 384cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 385 386else 387 388ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h) 389 390ifeq ($(ASM_PROTOTYPES),) 391cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 392 393else 394 395# versioning matches the C process described above, with difference that 396# we parse asm-prototypes.h C header to get function definitions. 397 398cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $< 399 400cmd_modversions_S = \ 401 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ 402 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ 403 > $(@D)/.tmp_$(@F:.o=.ver); \ 404 \ 405 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ 406 -T $(@D)/.tmp_$(@F:.o=.ver); \ 407 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ 408 else \ 409 mv -f $(@D)/.tmp_$(@F) $@; \ 410 fi; 411endif 412endif 413 414$(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE 415 $(call if_changed_rule,as_o_S) 416 417targets += $(real-objs-y) $(real-objs-m) $(lib-y) 418targets += $(extra-y) $(MAKECMDGOALS) $(always) 419 420# Linker scripts preprocessor (.lds.S -> .lds) 421# --------------------------------------------------------------------------- 422quiet_cmd_cpp_lds_S = LDS $@ 423 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ 424 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< 425 426$(obj)/%.lds: $(src)/%.lds.S FORCE 427 $(call if_changed_dep,cpp_lds_S) 428 429# ASN.1 grammar 430# --------------------------------------------------------------------------- 431quiet_cmd_asn1_compiler = ASN.1 $@ 432 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ 433 $(subst .h,.c,$@) $(subst .c,.h,$@) 434 435.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h 436 437$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler 438 $(call cmd,asn1_compiler) 439 440# Build the compiled-in targets 441# --------------------------------------------------------------------------- 442 443# To build objects in subdirs, we need to descend into the directories 444$(sort $(subdir-obj-y)): $(subdir-ym) ; 445 446# 447# Rule to compile a set of .o files into one .o file 448# 449ifdef builtin-target 450 451ifdef CONFIG_THIN_ARCHIVES 452 cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) 453 cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) 454 quiet_cmd_link_o_target = AR $@ 455else 456 cmd_make_builtin = $(LD) $(ld_flags) -r -o 457 cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) 458 quiet_cmd_link_o_target = LD $@ 459endif 460 461# If the list of objects to link is empty, just create an empty built-in.o 462cmd_link_o_target = $(if $(strip $(obj-y)),\ 463 $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \ 464 $(cmd_secanalysis),\ 465 $(cmd_make_empty_builtin) $@) 466 467$(builtin-target): $(obj-y) FORCE 468 $(call if_changed,link_o_target) 469 470targets += $(builtin-target) 471endif # builtin-target 472 473# 474# Rule to create modules.order file 475# 476# Create commands to either record .ko file or cat modules.order from 477# a subdirectory 478modorder-cmds = \ 479 $(foreach m, $(modorder), \ 480 $(if $(filter %/modules.order, $m), \ 481 cat $m;, echo kernel/$m;)) 482 483$(modorder-target): $(subdir-ym) FORCE 484 $(Q)(cat /dev/null; $(modorder-cmds)) > $@ 485 486# 487# Rule to compile a set of .o files into one .a file 488# 489ifdef lib-target 490quiet_cmd_link_l_target = AR $@ 491 492ifdef CONFIG_THIN_ARCHIVES 493 cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y) 494else 495 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y) 496endif 497 498$(lib-target): $(lib-y) FORCE 499 $(call if_changed,link_l_target) 500 501targets += $(lib-target) 502 503dummy-object = $(obj)/.lib_exports.o 504ksyms-lds = $(dot-target).lds 505ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX 506ref_prefix = EXTERN(_ 507else 508ref_prefix = EXTERN( 509endif 510 511quiet_cmd_export_list = EXPORTS $@ 512cmd_export_list = $(OBJDUMP) -h $< | \ 513 sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\ 514 rm -f $(dummy-object);\ 515 echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\ 516 $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\ 517 rm $(dummy-object) $(ksyms-lds) 518 519$(obj)/lib-ksyms.o: $(lib-target) FORCE 520 $(call if_changed,export_list) 521 522targets += $(obj)/lib-ksyms.o 523 524endif 525 526# 527# Rule to link composite objects 528# 529# Composite objects are specified in kbuild makefile as follows: 530# <composite-object>-objs := <list of .o files> 531# or 532# <composite-object>-y := <list of .o files> 533# or 534# <composite-object>-m := <list of .o files> 535# The -m syntax only works if <composite object> is a module 536link_multi_deps = \ 537$(filter $(addprefix $(obj)/, \ 538$($(subst $(obj)/,,$(@:.o=-objs))) \ 539$($(subst $(obj)/,,$(@:.o=-y))) \ 540$($(subst $(obj)/,,$(@:.o=-m)))), $^) 541 542cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) 543 544ifdef CONFIG_THIN_ARCHIVES 545 quiet_cmd_link_multi-y = AR $@ 546 cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps) 547else 548 quiet_cmd_link_multi-y = LD $@ 549 cmd_link_multi-y = $(cmd_link_multi-link) 550endif 551 552quiet_cmd_link_multi-m = LD [M] $@ 553cmd_link_multi-m = $(cmd_link_multi-link) 554 555$(multi-used-y): FORCE 556 $(call if_changed,link_multi-y) 557$(call multi_depend, $(multi-used-y), .o, -objs -y) 558 559$(multi-used-m): FORCE 560 $(call if_changed,link_multi-m) 561 @{ echo $(@:.o=.ko); echo $(link_multi_deps); \ 562 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) 563$(call multi_depend, $(multi-used-m), .o, -objs -y -m) 564 565targets += $(multi-used-y) $(multi-used-m) 566 567 568# Descending 569# --------------------------------------------------------------------------- 570 571PHONY += $(subdir-ym) 572$(subdir-ym): 573 $(Q)$(MAKE) $(build)=$@ 574 575# Add FORCE to the prequisites of a target to force it to be always rebuilt. 576# --------------------------------------------------------------------------- 577 578PHONY += FORCE 579 580FORCE: 581 582# Read all saved command lines and dependencies for the $(targets) we 583# may be building above, using $(if_changed{,_dep}). As an 584# optimization, we don't need to read them if the target does not 585# exist, we will rebuild anyway in that case. 586 587targets := $(wildcard $(sort $(targets))) 588cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 589 590ifneq ($(cmd_files),) 591 include $(cmd_files) 592endif 593 594# Declare the contents of the .PHONY variable as phony. We keep that 595# information in a variable se we can use it in if_changed and friends. 596 597.PHONY: $(PHONY) 598