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)$(hostcxxlibs-m),) 65include scripts/Makefile.host 66endif 67 68ifndef obj 69$(warning kbuild: Makefile.build is included improperly) 70endif 71 72# =========================================================================== 73 74ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) 75lib-target := $(obj)/lib.a 76obj-y += $(obj)/lib-ksyms.o 77endif 78 79ifneq ($(strip $(obj-y) $(need-builtin)),) 80builtin-target := $(obj)/built-in.o 81endif 82 83modorder-target := $(obj)/modules.order 84 85# We keep a list of all modules in $(MODVERDIR) 86 87__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ 88 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ 89 $(subdir-ym) $(always) 90 @: 91 92# Linus' kernel sanity checking tool 93ifneq ($(KBUILD_CHECKSRC),0) 94 ifeq ($(KBUILD_CHECKSRC),2) 95 quiet_cmd_force_checksrc = CHECK $< 96 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; 97 else 98 quiet_cmd_checksrc = CHECK $< 99 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; 100 endif 101endif 102 103ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),) 104 cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< ; 105endif 106 107# Do section mismatch analysis for each module/built-in.o 108ifdef CONFIG_DEBUG_SECTION_MISMATCH 109 cmd_secanalysis = ; scripts/mod/modpost $@ 110endif 111 112# Compile C sources (.c) 113# --------------------------------------------------------------------------- 114 115# Default is built-in, unless we know otherwise 116modkern_cflags = \ 117 $(if $(part-of-module), \ 118 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ 119 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL)) 120quiet_modtag := $(empty) $(empty) 121 122$(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$(real-objs-m:.o=.lst): part-of-module := y 126 127$(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$(real-objs-m:.o=.lst): quiet_modtag := [M] 131 132$(obj-m) : quiet_modtag := [M] 133 134# Default for not multi-part modules 135modname = $(basetarget) 136 137$(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) 145 146quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ 147cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $< 148 149$(obj)/%.s: $(src)/%.c FORCE 150 $(call if_changed_dep,cc_s_c) 151 152quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ 153cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< 154 155$(obj)/%.i: $(src)/%.c FORCE 156 $(call if_changed_dep,cpp_i_c) 157 158# These mirror gensymtypes_S and co below, keep them in synch. 159cmd_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)) 166 167quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ 168cmd_cc_symtypes_c = \ 169 set -e; \ 170 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \ 171 test -s $@ || rm -f $@ 172 173$(obj)/%.symtypes : $(src)/%.c FORCE 174 $(call cmd,cc_symtypes_c) 175 176# LLVM assembly 177# Generate .ll files from .c 178quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ 179 cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< 180 181$(obj)/%.ll: $(src)/%.c FORCE 182 $(call if_changed_dep,cc_ll_c) 183 184# C (.c) files 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) 187 188quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ 189 190ifndef CONFIG_MODVERSIONS 191cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 192 193else 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 198# are done. 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 205 206cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< 207 208cmd_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); \ 212 \ 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); \ 216 else \ 217 mv -f $(@D)/.tmp_$(@F) $@; \ 218 fi; 219endif 220 221ifdef CONFIG_FTRACE_MCOUNT_RECORD 222ifdef BUILD_C_RECORDMCOUNT 223ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") 224 RECORDMCOUNT_FLAGS = -w 225endif 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. 230sub_cmd_record_mcount = \ 231 if [ $(@) != "scripts/mod/empty.o" ]; then \ 232 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ 233 fi; 234recordmcount_source := $(srctree)/scripts/recordmcount.c \ 235 $(srctree)/scripts/recordmcount.h 236else 237sub_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 $(part-of-module),1,0)" "$(@)"; 243recordmcount_source := $(srctree)/scripts/recordmcount.pl 244endif # BUILD_C_RECORDMCOUNT 245cmd_record_mcount = \ 246 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \ 247 "$(CC_FLAGS_FTRACE)" ]; then \ 248 $(sub_cmd_record_mcount) \ 249 fi; 250endif # CONFIG_FTRACE_MCOUNT_RECORD 251 252ifdef CONFIG_STACK_VALIDATION 253ifneq ($(SKIP_STACK_VALIDATION),1) 254 255__objtool_obj := $(objtree)/tools/objtool/objtool 256 257objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check) 258 259ifndef CONFIG_FRAME_POINTER 260objtool_args += --no-fp 261endif 262ifdef CONFIG_GCOV_KERNEL 263objtool_args += --no-unreachable 264else 265objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable) 266endif 267 268ifdef CONFIG_MODVERSIONS 269objtool_o = $(@D)/.tmp_$(@F) 270else 271objtool_o = $(@) 272endif 273 274# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory 275# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file 276# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file 277cmd_objtool = $(if $(patsubst y%,, \ 278 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ 279 $(__objtool_obj) $(objtool_args) "$(objtool_o)";) 280objtool_obj = $(if $(patsubst y%,, \ 281 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ 282 $(__objtool_obj)) 283 284endif # SKIP_STACK_VALIDATION 285endif # CONFIG_STACK_VALIDATION 286 287# Rebuild all objects when objtool changes, or is enabled/disabled. 288objtool_dep = $(objtool_obj) \ 289 $(wildcard include/config/orc/unwinder.h \ 290 include/config/stack/validation.h) 291 292define rule_cc_o_c 293 $(call echo-cmd,checksrc) $(cmd_checksrc) \ 294 $(call cmd_and_fixdep,cc_o_c) \ 295 $(cmd_checkdoc) \ 296 $(call echo-cmd,objtool) $(cmd_objtool) \ 297 $(cmd_modversions_c) \ 298 $(call echo-cmd,record_mcount) $(cmd_record_mcount) 299endef 300 301define rule_as_o_S 302 $(call cmd_and_fixdep,as_o_S) \ 303 $(call echo-cmd,objtool) $(cmd_objtool) \ 304 $(cmd_modversions_S) 305endef 306 307# List module undefined symbols (or empty line if not enabled) 308ifdef CONFIG_TRIM_UNUSED_KSYMS 309cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo 310else 311cmd_undef_syms = echo 312endif 313 314# Built-in and composite module parts 315$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE 316 $(call cmd,force_checksrc) 317 $(call if_changed_rule,cc_o_c) 318 319# Single-part modules are special since we need to mark them in $(MODVERDIR) 320 321$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE 322 $(call cmd,force_checksrc) 323 $(call if_changed_rule,cc_o_c) 324 @{ echo $(@:.o=.ko); echo $@; \ 325 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) 326 327quiet_cmd_cc_lst_c = MKLST $@ 328 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ 329 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ 330 System.map $(OBJDUMP) > $@ 331 332$(obj)/%.lst: $(src)/%.c FORCE 333 $(call if_changed_dep,cc_lst_c) 334 335# Compile assembler sources (.S) 336# --------------------------------------------------------------------------- 337 338modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) 339 340$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) 341$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) 342 343# .S file exports must have their C prototypes defined in asm/asm-prototypes.h 344# or a file that it includes, in order to get versioned symbols. We build a 345# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from 346# the .S file (with trailing ';'), and run genksyms on that, to extract vers. 347# 348# This is convoluted. The .S file must first be preprocessed to run guards and 349# expand names, then the resulting exports must be constructed into plain 350# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed 351# to make the genksyms input. 352# 353# These mirror gensymtypes_c and co above, keep them in synch. 354cmd_gensymtypes_S = \ 355 (echo "\#include <linux/kernel.h>" ; \ 356 echo "\#include <asm/asm-prototypes.h>" ; \ 357 $(CPP) $(a_flags) $< | \ 358 grep "\<___EXPORT_SYMBOL\>" | \ 359 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \ 360 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \ 361 $(GENKSYMS) $(if $(1), -T $(2)) \ 362 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ 363 $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ 364 $(if $(KBUILD_PRESERVE),-p) \ 365 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) 366 367quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ 368cmd_cc_symtypes_S = \ 369 set -e; \ 370 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \ 371 test -s $@ || rm -f $@ 372 373$(obj)/%.symtypes : $(src)/%.S FORCE 374 $(call cmd,cc_symtypes_S) 375 376 377quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ 378cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< 379 380$(obj)/%.s: $(src)/%.S FORCE 381 $(call if_changed_dep,cpp_s_S) 382 383quiet_cmd_as_o_S = AS $(quiet_modtag) $@ 384 385ifndef CONFIG_MODVERSIONS 386cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 387 388else 389 390ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h) 391 392ifeq ($(ASM_PROTOTYPES),) 393cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 394 395else 396 397# versioning matches the C process described above, with difference that 398# we parse asm-prototypes.h C header to get function definitions. 399 400cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $< 401 402cmd_modversions_S = \ 403 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ 404 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ 405 > $(@D)/.tmp_$(@F:.o=.ver); \ 406 \ 407 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ 408 -T $(@D)/.tmp_$(@F:.o=.ver); \ 409 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ 410 else \ 411 mv -f $(@D)/.tmp_$(@F) $@; \ 412 fi; 413endif 414endif 415 416$(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE 417 $(call if_changed_rule,as_o_S) 418 419targets += $(real-objs-y) $(real-objs-m) $(lib-y) 420targets += $(extra-y) $(MAKECMDGOALS) $(always) 421 422# Linker scripts preprocessor (.lds.S -> .lds) 423# --------------------------------------------------------------------------- 424quiet_cmd_cpp_lds_S = LDS $@ 425 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ 426 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< 427 428$(obj)/%.lds: $(src)/%.lds.S FORCE 429 $(call if_changed_dep,cpp_lds_S) 430 431# ASN.1 grammar 432# --------------------------------------------------------------------------- 433quiet_cmd_asn1_compiler = ASN.1 $@ 434 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ 435 $(subst .h,.c,$@) $(subst .c,.h,$@) 436 437.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h 438 439$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler 440 $(call cmd,asn1_compiler) 441 442# Build the compiled-in targets 443# --------------------------------------------------------------------------- 444 445# To build objects in subdirs, we need to descend into the directories 446$(sort $(subdir-obj-y)): $(subdir-ym) ; 447 448# 449# Rule to compile a set of .o files into one .o file 450# 451ifdef builtin-target 452 453ifdef CONFIG_THIN_ARCHIVES 454 cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) 455 cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) 456 quiet_cmd_link_o_target = AR $@ 457else 458 cmd_make_builtin = $(LD) $(ld_flags) -r -o 459 cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) 460 quiet_cmd_link_o_target = LD $@ 461endif 462 463# If the list of objects to link is empty, just create an empty built-in.o 464cmd_link_o_target = $(if $(strip $(obj-y)),\ 465 $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \ 466 $(cmd_secanalysis),\ 467 $(cmd_make_empty_builtin) $@) 468 469$(builtin-target): $(obj-y) FORCE 470 $(call if_changed,link_o_target) 471 472targets += $(builtin-target) 473endif # builtin-target 474 475# 476# Rule to create modules.order file 477# 478# Create commands to either record .ko file or cat modules.order from 479# a subdirectory 480modorder-cmds = \ 481 $(foreach m, $(modorder), \ 482 $(if $(filter %/modules.order, $m), \ 483 cat $m;, echo kernel/$m;)) 484 485$(modorder-target): $(subdir-ym) FORCE 486 $(Q)(cat /dev/null; $(modorder-cmds)) > $@ 487 488# 489# Rule to compile a set of .o files into one .a file 490# 491ifdef lib-target 492quiet_cmd_link_l_target = AR $@ 493 494ifdef CONFIG_THIN_ARCHIVES 495 cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y) 496else 497 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y) 498endif 499 500$(lib-target): $(lib-y) FORCE 501 $(call if_changed,link_l_target) 502 503targets += $(lib-target) 504 505dummy-object = $(obj)/.lib_exports.o 506ksyms-lds = $(dot-target).lds 507ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX 508ref_prefix = EXTERN(_ 509else 510ref_prefix = EXTERN( 511endif 512 513quiet_cmd_export_list = EXPORTS $@ 514cmd_export_list = $(OBJDUMP) -h $< | \ 515 sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\ 516 rm -f $(dummy-object);\ 517 echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\ 518 $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\ 519 rm $(dummy-object) $(ksyms-lds) 520 521$(obj)/lib-ksyms.o: $(lib-target) FORCE 522 $(call if_changed,export_list) 523 524targets += $(obj)/lib-ksyms.o 525 526endif 527 528# 529# Rule to link composite objects 530# 531# Composite objects are specified in kbuild makefile as follows: 532# <composite-object>-objs := <list of .o files> 533# or 534# <composite-object>-y := <list of .o files> 535# or 536# <composite-object>-m := <list of .o files> 537# The -m syntax only works if <composite object> is a module 538link_multi_deps = \ 539$(filter $(addprefix $(obj)/, \ 540$($(subst $(obj)/,,$(@:.o=-objs))) \ 541$($(subst $(obj)/,,$(@:.o=-y))) \ 542$($(subst $(obj)/,,$(@:.o=-m)))), $^) 543 544cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) 545 546ifdef CONFIG_THIN_ARCHIVES 547 quiet_cmd_link_multi-y = AR $@ 548 cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps) 549else 550 quiet_cmd_link_multi-y = LD $@ 551 cmd_link_multi-y = $(cmd_link_multi-link) 552endif 553 554quiet_cmd_link_multi-m = LD [M] $@ 555cmd_link_multi-m = $(cmd_link_multi-link) 556 557$(multi-used-y): FORCE 558 $(call if_changed,link_multi-y) 559$(call multi_depend, $(multi-used-y), .o, -objs -y) 560 561$(multi-used-m): FORCE 562 $(call if_changed,link_multi-m) 563 @{ echo $(@:.o=.ko); echo $(link_multi_deps); \ 564 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) 565$(call multi_depend, $(multi-used-m), .o, -objs -y -m) 566 567targets += $(multi-used-y) $(multi-used-m) 568targets := $(filter-out $(PHONY), $(targets)) 569 570# Descending 571# --------------------------------------------------------------------------- 572 573PHONY += $(subdir-ym) 574$(subdir-ym): 575 $(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1) 576 577# Add FORCE to the prequisites of a target to force it to be always rebuilt. 578# --------------------------------------------------------------------------- 579 580PHONY += FORCE 581 582FORCE: 583 584# Read all saved command lines and dependencies for the $(targets) we 585# may be building above, using $(if_changed{,_dep}). As an 586# optimization, we don't need to read them if the target does not 587# exist, we will rebuild anyway in that case. 588 589cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 590 591ifneq ($(cmd_files),) 592 include $(cmd_files) 593endif 594 595ifneq ($(KBUILD_SRC),) 596# Create directories for object files if they do not exist 597obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets)))) 598# If cmd_files exist, their directories apparently exist. Skip mkdir. 599exist-dirs := $(sort $(patsubst %/,%, $(dir $(cmd_files)))) 600obj-dirs := $(strip $(filter-out $(exist-dirs), $(obj-dirs))) 601ifneq ($(obj-dirs),) 602$(shell mkdir -p $(obj-dirs)) 603endif 604endif 605 606# Declare the contents of the .PHONY variable as phony. We keep that 607# information in a variable se we can use it in if_changed and friends. 608 609.PHONY: $(PHONY) 610