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 $(if $(KBUILD_PRESERVE),-p) \ 168 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) 169 170quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ 171cmd_cc_symtypes_c = \ 172 set -e; \ 173 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \ 174 test -s $@ || rm -f $@ 175 176$(obj)/%.symtypes : $(src)/%.c FORCE 177 $(call cmd,cc_symtypes_c) 178 179# C (.c) files 180# The C file is compiled and updated dependency information is generated. 181# (See cmd_cc_o_c + relevant part of rule_cc_o_c) 182 183quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ 184 185ifndef CONFIG_MODVERSIONS 186cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 187 188else 189# When module versioning is enabled the following steps are executed: 190# o compile a .tmp_<file>.o from <file>.c 191# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does 192# not export symbols, we just rename .tmp_<file>.o to <file>.o and 193# are done. 194# o otherwise, we calculate symbol versions using the good old 195# genksyms on the preprocessed source and postprocess them in a way 196# that they are usable as a linker script 197# o generate <file>.o from .tmp_<file>.o using the linker to 198# replace the unresolved symbols __crc_exported_symbol with 199# the actual value of the checksum generated by genksyms 200 201cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< 202 203cmd_modversions_c = \ 204 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ 205 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ 206 > $(@D)/.tmp_$(@F:.o=.ver); \ 207 \ 208 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ 209 -T $(@D)/.tmp_$(@F:.o=.ver); \ 210 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ 211 else \ 212 mv -f $(@D)/.tmp_$(@F) $@; \ 213 fi; 214endif 215 216ifdef CONFIG_FTRACE_MCOUNT_RECORD 217ifdef BUILD_C_RECORDMCOUNT 218ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") 219 RECORDMCOUNT_FLAGS = -w 220endif 221# Due to recursion, we must skip empty.o. 222# The empty.o file is created in the make process in order to determine 223# the target endianness and word size. It is made before all other C 224# files, including recordmcount. 225sub_cmd_record_mcount = \ 226 if [ $(@) != "scripts/mod/empty.o" ]; then \ 227 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ 228 fi; 229recordmcount_source := $(srctree)/scripts/recordmcount.c \ 230 $(srctree)/scripts/recordmcount.h 231else 232sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ 233 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ 234 "$(if $(CONFIG_64BIT),64,32)" \ 235 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \ 236 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \ 237 "$(if $(part-of-module),1,0)" "$(@)"; 238recordmcount_source := $(srctree)/scripts/recordmcount.pl 239endif 240cmd_record_mcount = \ 241 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \ 242 "$(CC_FLAGS_FTRACE)" ]; then \ 243 $(sub_cmd_record_mcount) \ 244 fi; 245endif 246 247ifdef CONFIG_STACK_VALIDATION 248ifneq ($(SKIP_STACK_VALIDATION),1) 249 250__objtool_obj := $(objtree)/tools/objtool/objtool 251 252objtool_args = check 253ifndef CONFIG_FRAME_POINTER 254objtool_args += --no-fp 255endif 256 257# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory 258# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file 259# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file 260cmd_objtool = $(if $(patsubst y%,, \ 261 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ 262 $(__objtool_obj) $(objtool_args) "$(@)";) 263objtool_obj = $(if $(patsubst y%,, \ 264 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ 265 $(__objtool_obj)) 266 267endif # SKIP_STACK_VALIDATION 268endif # CONFIG_STACK_VALIDATION 269 270define rule_cc_o_c 271 $(call echo-cmd,checksrc) $(cmd_checksrc) \ 272 $(call cmd_and_fixdep,cc_o_c) \ 273 $(cmd_modversions_c) \ 274 $(cmd_objtool) \ 275 $(call echo-cmd,record_mcount) $(cmd_record_mcount) 276endef 277 278define rule_as_o_S 279 $(call cmd_and_fixdep,as_o_S) \ 280 $(cmd_modversions_S) \ 281 $(cmd_objtool) 282endef 283 284# List module undefined symbols (or empty line if not enabled) 285ifdef CONFIG_TRIM_UNUSED_KSYMS 286cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo 287else 288cmd_undef_syms = echo 289endif 290 291# Built-in and composite module parts 292$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE 293 $(call cmd,force_checksrc) 294 $(call if_changed_rule,cc_o_c) 295 296# Single-part modules are special since we need to mark them in $(MODVERDIR) 297 298$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE 299 $(call cmd,force_checksrc) 300 $(call if_changed_rule,cc_o_c) 301 @{ echo $(@:.o=.ko); echo $@; \ 302 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) 303 304quiet_cmd_cc_lst_c = MKLST $@ 305 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ 306 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ 307 System.map $(OBJDUMP) > $@ 308 309$(obj)/%.lst: $(src)/%.c FORCE 310 $(call if_changed_dep,cc_lst_c) 311 312# Compile assembler sources (.S) 313# --------------------------------------------------------------------------- 314 315modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) 316 317$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) 318$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) 319 320# .S file exports must have their C prototypes defined in asm/asm-prototypes.h 321# or a file that it includes, in order to get versioned symbols. We build a 322# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from 323# the .S file (with trailing ';'), and run genksyms on that, to extract vers. 324# 325# This is convoluted. The .S file must first be preprocessed to run guards and 326# expand names, then the resulting exports must be constructed into plain 327# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed 328# to make the genksyms input. 329# 330# These mirror gensymtypes_c and co above, keep them in synch. 331cmd_gensymtypes_S = \ 332 (echo "\#include <linux/kernel.h>" ; \ 333 echo "\#include <asm/asm-prototypes.h>" ; \ 334 $(CPP) $(a_flags) $< | \ 335 grep "\<___EXPORT_SYMBOL\>" | \ 336 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \ 337 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \ 338 $(GENKSYMS) $(if $(1), -T $(2)) \ 339 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ 340 $(if $(KBUILD_PRESERVE),-p) \ 341 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) 342 343quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ 344cmd_cc_symtypes_S = \ 345 set -e; \ 346 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \ 347 test -s $@ || rm -f $@ 348 349$(obj)/%.symtypes : $(src)/%.S FORCE 350 $(call cmd,cc_symtypes_S) 351 352 353quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ 354cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< 355 356$(obj)/%.s: $(src)/%.S FORCE 357 $(call if_changed_dep,cpp_s_S) 358 359quiet_cmd_as_o_S = AS $(quiet_modtag) $@ 360 361ifndef CONFIG_MODVERSIONS 362cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 363 364else 365 366ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h) 367 368ifeq ($(ASM_PROTOTYPES),) 369cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 370 371else 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_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $< 377 378cmd_modversions_S = \ 379 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ 380 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ 381 > $(@D)/.tmp_$(@F:.o=.ver); \ 382 \ 383 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ 384 -T $(@D)/.tmp_$(@F:.o=.ver); \ 385 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ 386 else \ 387 mv -f $(@D)/.tmp_$(@F) $@; \ 388 fi; 389endif 390endif 391 392$(obj)/%.o: $(src)/%.S $(objtool_obj) FORCE 393 $(call if_changed_rule,as_o_S) 394 395targets += $(real-objs-y) $(real-objs-m) $(lib-y) 396targets += $(extra-y) $(MAKECMDGOALS) $(always) 397 398# Linker scripts preprocessor (.lds.S -> .lds) 399# --------------------------------------------------------------------------- 400quiet_cmd_cpp_lds_S = LDS $@ 401 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \ 402 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< 403 404$(obj)/%.lds: $(src)/%.lds.S FORCE 405 $(call if_changed_dep,cpp_lds_S) 406 407# ASN.1 grammar 408# --------------------------------------------------------------------------- 409quiet_cmd_asn1_compiler = ASN.1 $@ 410 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ 411 $(subst .h,.c,$@) $(subst .c,.h,$@) 412 413.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h 414 415$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler 416 $(call cmd,asn1_compiler) 417 418# Build the compiled-in targets 419# --------------------------------------------------------------------------- 420 421# To build objects in subdirs, we need to descend into the directories 422$(sort $(subdir-obj-y)): $(subdir-ym) ; 423 424# 425# Rule to compile a set of .o files into one .o file 426# 427ifdef builtin-target 428 429ifdef CONFIG_THIN_ARCHIVES 430 cmd_make_builtin = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS) 431 cmd_make_empty_builtin = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS) 432 quiet_cmd_link_o_target = AR $@ 433else 434 cmd_make_builtin = $(LD) $(ld_flags) -r -o 435 cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) 436 quiet_cmd_link_o_target = LD $@ 437endif 438 439# If the list of objects to link is empty, just create an empty built-in.o 440cmd_link_o_target = $(if $(strip $(obj-y)),\ 441 $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \ 442 $(cmd_secanalysis),\ 443 $(cmd_make_empty_builtin) $@) 444 445$(builtin-target): $(obj-y) FORCE 446 $(call if_changed,link_o_target) 447 448targets += $(builtin-target) 449endif # builtin-target 450 451# 452# Rule to create modules.order file 453# 454# Create commands to either record .ko file or cat modules.order from 455# a subdirectory 456modorder-cmds = \ 457 $(foreach m, $(modorder), \ 458 $(if $(filter %/modules.order, $m), \ 459 cat $m;, echo kernel/$m;)) 460 461$(modorder-target): $(subdir-ym) FORCE 462 $(Q)(cat /dev/null; $(modorder-cmds)) > $@ 463 464# 465# Rule to compile a set of .o files into one .a file 466# 467ifdef lib-target 468quiet_cmd_link_l_target = AR $@ 469 470ifdef CONFIG_THIN_ARCHIVES 471 cmd_link_l_target = rm -f $@; $(AR) rcsT$(KBUILD_ARFLAGS) $@ $(lib-y) 472else 473 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y) 474endif 475 476$(lib-target): $(lib-y) FORCE 477 $(call if_changed,link_l_target) 478 479targets += $(lib-target) 480 481dummy-object = $(obj)/.lib_exports.o 482ksyms-lds = $(dot-target).lds 483ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX 484ref_prefix = EXTERN(_ 485else 486ref_prefix = EXTERN( 487endif 488 489quiet_cmd_export_list = EXPORTS $@ 490cmd_export_list = $(OBJDUMP) -h $< | \ 491 sed -ne '/___ksymtab/{s/.*+/$(ref_prefix)/;s/ .*/)/;p}' >$(ksyms-lds);\ 492 rm -f $(dummy-object);\ 493 $(AR) rcs$(KBUILD_ARFLAGS) $(dummy-object);\ 494 $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\ 495 rm $(dummy-object) $(ksyms-lds) 496 497$(obj)/lib-ksyms.o: $(lib-target) FORCE 498 $(call if_changed,export_list) 499 500targets += $(obj)/lib-ksyms.o 501 502endif 503 504# 505# Rule to link composite objects 506# 507# Composite objects are specified in kbuild makefile as follows: 508# <composite-object>-objs := <list of .o files> 509# or 510# <composite-object>-y := <list of .o files> 511# or 512# <composite-object>-m := <list of .o files> 513# The -m syntax only works if <composite object> is a module 514link_multi_deps = \ 515$(filter $(addprefix $(obj)/, \ 516$($(subst $(obj)/,,$(@:.o=-objs))) \ 517$($(subst $(obj)/,,$(@:.o=-y))) \ 518$($(subst $(obj)/,,$(@:.o=-m)))), $^) 519 520quiet_cmd_link_multi-y = LD $@ 521cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) 522 523quiet_cmd_link_multi-m = LD [M] $@ 524cmd_link_multi-m = $(cmd_link_multi-y) 525 526$(multi-used-y): FORCE 527 $(call if_changed,link_multi-y) 528$(call multi_depend, $(multi-used-y), .o, -objs -y) 529 530$(multi-used-m): FORCE 531 $(call if_changed,link_multi-m) 532 @{ echo $(@:.o=.ko); echo $(link_multi_deps); \ 533 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) 534$(call multi_depend, $(multi-used-m), .o, -objs -y -m) 535 536targets += $(multi-used-y) $(multi-used-m) 537 538 539# Descending 540# --------------------------------------------------------------------------- 541 542PHONY += $(subdir-ym) 543$(subdir-ym): 544 $(Q)$(MAKE) $(build)=$@ 545 546# Add FORCE to the prequisites of a target to force it to be always rebuilt. 547# --------------------------------------------------------------------------- 548 549PHONY += FORCE 550 551FORCE: 552 553# Read all saved command lines and dependencies for the $(targets) we 554# may be building above, using $(if_changed{,_dep}). As an 555# optimization, we don't need to read them if the target does not 556# exist, we will rebuild anyway in that case. 557 558targets := $(wildcard $(sort $(targets))) 559cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 560 561ifneq ($(cmd_files),) 562 include $(cmd_files) 563endif 564 565# Declare the contents of the .PHONY variable as phony. We keep that 566# information in a variable se we can use it in if_changed and friends. 567 568.PHONY: $(PHONY) 569