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