Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 8
   4 EXTRAVERSION =-rc1
   5 NAME=Zonked Quokka
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # Do not print "Entering directory ..."
  14 MAKEFLAGS += --no-print-directory
  15
  16 # We are using a recursive build, so we need to do a little thinking
  17 # to get the ordering right.
  18 #
  19 # Most importantly: sub-Makefiles should only ever modify files in
  20 # their own directory. If in some directory we have a dependency on
  21 # a file in another dir (which doesn't happen often, but it's of
  22 # unavoidable when linking the built-in.o targets which finally
  23 # turn into vmlinux), we will call a sub make in that other dir, and
  24 # after that we are sure that everything which is in that other dir
  25 # is now up to date.
  26 #
  27 # The only cases where we need to modify files which have global
  28 # effects are thus separated out and done before the recursive
  29 # descending is started. They are now explicitly listed as the
  30 # prepare rule.
  31
  32 # To put more focus on warnings, be less verbose as default
  33 # Use 'make V=1' to see the full commands
  34
  35 ifdef V
  36   ifeq ("$(origin V)", "command line")
  37     KBUILD_VERBOSE = $(V)
  38   endif
  39 endif
  40 ifndef KBUILD_VERBOSE
  41   KBUILD_VERBOSE = 0
  42 endif
  43
  44 # Call sparse as part of compilation of C files
  45 # Use 'make C=1' to enable sparse checking
  46
  47 ifdef C
  48   ifeq ("$(origin C)", "command line")
  49     KBUILD_CHECKSRC = $(C)
  50   endif
  51 endif
  52 ifndef KBUILD_CHECKSRC
  53   KBUILD_CHECKSRC = 0
  54 endif
  55
  56 # Use make M=dir to specify direcotry of external module to build
  57 # Old syntax make ... SUBDIRS=$PWD is still supported
  58 # Setting the environment variable KBUILD_EXTMOD take precedence
  59 ifdef SUBDIRS
  60   KBUILD_EXTMOD ?= $(SUBDIRS)
  61 endif
  62 ifdef M
  63   ifeq ("$(origin M)", "command line")
  64     KBUILD_EXTMOD := $(M)
  65   endif
  66 endif
  67
  68
  69 # kbuild supports saving output files in a separate directory.
  70 # To locate output files in a separate directory two syntax'es are supported.
  71 # In both cases the working directory must be the root of the kernel src.
  72 # 1) O=
  73 # Use "make O=dir/to/store/output/files/"
  74 #
  75 # 2) Set KBUILD_OUTPUT
  76 # Set the environment variable KBUILD_OUTPUT to point to the directory
  77 # where the output files shall be placed.
  78 # export KBUILD_OUTPUT=dir/to/store/output/files/
  79 # make
  80 #
  81 # The O= assigment takes precedence over the KBUILD_OUTPUT environment variable.
  82
  83
  84 # KBUILD_SRC is set on invocation of make in OBJ directory
  85 # KBUILD_SRC is not intended to be used by the regular user (for now)
  86 ifeq ($(KBUILD_SRC),)
  87
  88 # OK, Make called in directory where kernel src resides
  89 # Do we want to locate output files in a separate directory?
  90 ifdef O
  91   ifeq ("$(origin O)", "command line")
  92     KBUILD_OUTPUT := $(O)
  93   endif
  94 endif
  95
  96 # That's our default target when none is given on the command line
  97 .PHONY: _all
  98 _all:
  99
 100 ifneq ($(KBUILD_OUTPUT),)
 101 # Invoke a second make in the output directory, passing relevant variables
 102 # check that the output directory actually exists
 103 saved-output := $(KBUILD_OUTPUT)
 104 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 105 $(if $(wildcard $(KBUILD_OUTPUT)),, \
 106      $(error output directory "$(saved-output)" does not exist))
 107
 108 .PHONY: $(MAKECMDGOALS)
 109
 110 $(filter-out _all,$(MAKECMDGOALS)) _all:
 111         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT)         \
 112         KBUILD_SRC=$(CURDIR)         KBUILD_VERBOSE=$(KBUILD_VERBOSE)   \
 113         KBUILD_CHECK=$(KBUILD_CHECK) KBUILD_EXTMOD="$(KBUILD_EXTMOD)"   \
 114         -f $(CURDIR)/Makefile $@
 115
 116 # Leave processing to above invocation of make
 117 skip-makefile := 1
 118 endif # ifneq ($(KBUILD_OUTPUT),)
 119 endif # ifeq ($(KBUILD_SRC),)
 120
 121 # We process the rest of the Makefile if this is the final invocation of make
 122 ifeq ($(skip-makefile),)
 123
 124 # If building an external module we do not care about the all: rule
 125 # but instead _all depend on modules
 126 .PHONY: all
 127 ifeq ($(KBUILD_EXTMOD),)
 128 _all: all
 129 else
 130 _all: modules
 131 endif
 132
 133 # Make sure we're not wasting cpu-cycles doing locale handling, yet do make
 134 # sure error messages appear in the user-desired language
 135 ifdef LC_ALL
 136 LANG := $(LC_ALL)
 137 LC_ALL :=
 138 endif
 139 LC_COLLATE := C
 140 LC_CTYPE := C
 141 export LANG LC_ALL LC_COLLATE LC_CTYPE
 142
 143 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 144 TOPDIR          := $(srctree)
 145 # FIXME - TOPDIR is obsolete, use srctree/objtree
 146 objtree         := $(CURDIR)
 147 src             := $(srctree)
 148 obj             := $(objtree)
 149
 150 VPATH           := $(srctree)
 151
 152 export srctree objtree VPATH TOPDIR
 153
 154 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 155
 156 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 157 # first, and if a usermode build is happening, the "ARCH=um" on the command
 158 # line overrides the setting of ARCH below.  If a native build is happening,
 159 # then ARCH is assigned, getting whatever value it gets normally, and
 160 # SUBARCH is subsequently ignored.
 161
 162 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 163                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 164                                   -e s/s390x/s390/ -e s/parisc64/parisc/ )
 165
 166 # Cross compiling and selecting different set of gcc/bin-utils
 167 # ---------------------------------------------------------------------------
 168 #
 169 # When performing cross compilation for other architectures ARCH shall be set
 170 # to the target architecture. (See arch/* for the possibilities).
 171 # ARCH can be set during invocation of make:
 172 # make ARCH=ia64
 173 # Another way is to have ARCH set in the environment.
 174 # The default ARCH is the host where make is executed.
 175
 176 # CROSS_COMPILE specify the prefix used for all executables used
 177 # during compilation. Only gcc and related bin-utils executables
 178 # are prefixed with $(CROSS_COMPILE).
 179 # CROSS_COMPILE can be set on the command line
 180 # make CROSS_COMPILE=ia64-linux-
 181 # Alternatively CROSS_COMPILE can be set in the environment.
 182 # Default value for CROSS_COMPILE is not to prefix executables
 183 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 184
 185 ARCH            ?= $(SUBARCH)
 186 CROSS_COMPILE   ?=
 187
 188 # Architecture as present in compile.h
 189 UTS_MACHINE := $(ARCH)
 190
 191 # SHELL used by kbuild
 192 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 193           else if [ -x /bin/bash ]; then echo /bin/bash; \
 194           else echo sh; fi ; fi)
 195
 196 HOSTCC          = gcc
 197 HOSTCXX         = g++
 198 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 199 HOSTCXXFLAGS    = -O2
 200
 201 #       Decide whether to build built-in, modular, or both.
 202 #       Normally, just do built-in.
 203
 204 KBUILD_MODULES :=
 205 KBUILD_BUILTIN := 1
 206
 207 #       If we have only "make modules", don't compile built-in objects.
 208 #       When we're building modules with modversions, we need to consider
 209 #       the built-in objects during the descend as well, in order to
 210 #       make sure the checksums are uptodate before we record them.
 211
 212 ifeq ($(MAKECMDGOALS),modules)
 213   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 214 endif
 215
 216 #       If we have "make <whatever> modules", compile modules
 217 #       in addition to whatever we do anyway.
 218 #       Just "make" or "make all" shall build modules as well
 219
 220 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 221   KBUILD_MODULES := 1
 222 endif
 223
 224 ifeq ($(MAKECMDGOALS),)
 225   KBUILD_MODULES := 1
 226 endif
 227
 228 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
 229 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 230
 231 # Beautify output
 232 # ---------------------------------------------------------------------------
 233 #
 234 # Normally, we echo the whole command before executing it. By making
 235 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 236 # $(quiet) to choose other forms of output instead, e.g.
 237 #
 238 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 239 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 240 #
 241 # If $(quiet) is empty, the whole command will be printed.
 242 # If it is set to "quiet_", only the short version will be printed.
 243 # If it is set to "silent_", nothing wil be printed at all, since
 244 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 245 #
 246 # A simple variant is to prefix commands with $(Q) - that's usefull
 247 # for commands that shall be hidden in non-verbose mode.
 248 #
 249 #       $(Q)ln $@ :<
 250 #
 251 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 252 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 253
 254 ifeq ($(KBUILD_VERBOSE),1)
 255   quiet =
 256   Q =
 257 else
 258   quiet=quiet_
 259   Q = @
 260 endif
 261
 262 # If the user is running make -s (silent mode), suppress echoing of
 263 # commands
 264
 265 ifneq ($(findstring s,$(MAKEFLAGS)),)
 266   quiet=silent_
 267 endif
 268
 269 check_gcc = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 270
 271 export quiet Q KBUILD_VERBOSE check_gcc
 272
 273 # Look for make include files relative to root of kernel src
 274 MAKEFLAGS += --include-dir=$(srctree)
 275
 276 # For maximum performance (+ possibly random breakage, uncomment
 277 # the following)
 278
 279 #MAKEFLAGS += -rR
 280
 281 # Make variables (CC, etc...)
 282
 283 AS              = $(CROSS_COMPILE)as
 284 LD              = $(CROSS_COMPILE)ld
 285 CC              = $(CROSS_COMPILE)gcc
 286 CPP             = $(CC) -E
 287 AR              = $(CROSS_COMPILE)ar
 288 NM              = $(CROSS_COMPILE)nm
 289 STRIP           = $(CROSS_COMPILE)strip
 290 OBJCOPY         = $(CROSS_COMPILE)objcopy
 291 OBJDUMP         = $(CROSS_COMPILE)objdump
 292 AWK             = awk
 293 GENKSYMS        = scripts/genksyms/genksyms
 294 DEPMOD          = /sbin/depmod
 295 KALLSYMS        = scripts/kallsyms
 296 PERL            = perl
 297 CHECK           = sparse
 298 MODFLAGS        = -DMODULE
 299 CFLAGS_MODULE   = $(MODFLAGS)
 300 AFLAGS_MODULE   = $(MODFLAGS)
 301 LDFLAGS_MODULE  = -r
 302 CFLAGS_KERNEL   =
 303 AFLAGS_KERNEL   =
 304
 305 NOSTDINC_FLAGS  = -nostdinc -iwithprefix include
 306
 307 CPPFLAGS        := -D__KERNEL__ -Iinclude \
 308                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
 309
 310 CFLAGS          := -Wall -Wstrict-prototypes -Wno-trigraphs \
 311                    -fno-strict-aliasing -fno-common
 312 AFLAGS          := -D__ASSEMBLY__
 313
 314 export  VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
 315         CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 316         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 317         HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB LDFLAGS_MODULE CHECK
 318
 319 export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFLAGS LDFLAGS
 320 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 321 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 322
 323 # When compiling out-of-tree modules, put MODVERDIR in the module
 324 # tree rather than in the kernel tree. The kernel tree might
 325 # even be read-only.
 326 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 327
 328 # The temporary file to save gcc -MD generated dependencies must not
 329 # contain a comma
 330 comma := ,
 331 depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
 332
 333 # Files to ignore in find ... statements
 334
 335 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc \) -prune -o
 336 RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc
 337
 338 # ===========================================================================
 339 # Rules shared between *config targets and build targets
 340
 341 # Basic helpers built in scripts/
 342 .PHONY: scripts_basic
 343 scripts_basic:
 344         $(Q)$(MAKE) $(build)=scripts/basic
 345
 346 # To make sure we do not include .config for any of the *config targets
 347 # catch them early, and hand them over to scripts/kconfig/Makefile
 348 # It is allowed to specify more targets when calling make, including
 349 # mixing *config targets and build targets.
 350 # For example 'make oldconfig all'.
 351 # Detect when mixed targets is specified, and make a second invocation
 352 # of make so .config is not included in this case either (for *config).
 353
 354 no-dot-config-targets := clean mrproper distclean \
 355                          cscope TAGS tags help %docs check%
 356
 357 config-targets := 0
 358 mixed-targets  := 0
 359 dot-config     := 1
 360
 361 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 362         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 363                 dot-config := 0
 364         endif
 365 endif
 366
 367 ifeq ($(KBUILD_EXTMOD),)
 368         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 369                 config-targets := 1
 370                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 371                         mixed-targets := 1
 372                 endif
 373         endif
 374 endif
 375
 376 ifeq ($(mixed-targets),1)
 377 # ===========================================================================
 378 # We're called with mixed targets (*config and build targets).
 379 # Handle them one by one.
 380
 381 %:: FORCE
 382         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 383
 384 else
 385 ifeq ($(config-targets),1)
 386 # ===========================================================================
 387 # *config targets only - make sure prerequisites are updated, and descend
 388 # in scripts/kconfig to make the *config target
 389
 390 config: scripts_basic FORCE
 391         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 392 %config: scripts_basic FORCE
 393         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 394
 395 else
 396 # ===========================================================================
 397 # Build targets only - this includes vmlinux, arch specific targets, clean
 398 # targets and others. In general all targets except *config targets.
 399
 400 ifeq ($(KBUILD_EXTMOD),)
 401 # Additional helpers built in scripts/
 402 # Carefully list dependencies so we do not try to build scripts twice
 403 # in parrallel
 404 .PHONY: scripts
 405 scripts: scripts_basic include/config/MARKER
 406         $(Q)$(MAKE) $(build)=$(@)
 407
 408 scripts_basic: include/linux/autoconf.h
 409
 410 # Objects we will link into vmlinux / subdirs we need to visit
 411 init-y          := init/
 412 drivers-y       := drivers/ sound/
 413 net-y           := net/
 414 libs-y          := lib/
 415 core-y          := usr/
 416 endif # KBUILD_EXTMOD
 417
 418 ifeq ($(dot-config),1)
 419 # In this section, we need .config
 420
 421 # Read in dependencies to all Kconfig* files, make sure to run
 422 # oldconfig if changes are detected.
 423 -include .config.cmd
 424
 425 include .config
 426
 427 # If .config needs to be updated, it will be done via the dependency
 428 # that autoconf has on .config.
 429 # To avoid any implicit rule to kick in, define an empty command
 430 .config: ;
 431
 432 # If .config is newer than include/linux/autoconf.h, someone tinkered
 433 # with it and forgot to run make oldconfig
 434 include/linux/autoconf.h: .config
 435         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 436 else
 437 # Dummy target needed, because used as prerequisite
 438 include/linux/autoconf.h: ;
 439 endif
 440
 441 include $(srctree)/arch/$(ARCH)/Makefile
 442
 443 # Default kernel image to build when no specific target is given.
 444 # KBUILD_IMAGE may be overruled on the commandline or
 445 # set in the environment
 446 # Also any assingments in arch/$(ARCH)/Makefiel take precedence over
 447 # this default value
 448 export KBUILD_IMAGE ?= vmlinux
 449
 450 # The all: target is the default when no target is given on the
 451 # command line.
 452 # This allow a user to issue only 'make' to build a kernel including modules
 453 # Defaults vmlinux but it is usually overriden in the arch makefile
 454 all: vmlinux
 455
 456 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 457 CFLAGS          += -Os
 458 else
 459 CFLAGS          += -O2
 460 endif
 461
 462 ifndef CONFIG_FRAME_POINTER
 463 CFLAGS          += -fomit-frame-pointer
 464 endif
 465
 466 ifdef CONFIG_DEBUG_INFO
 467 CFLAGS          += -g
 468 endif
 469
 470 # warn about C99 declaration after statement
 471 CFLAGS += $(call check_gcc,-Wdeclaration-after-statement,)
 472
 473 #
 474 # INSTALL_PATH specifies where to place the updated kernel and system map
 475 # images.  Uncomment if you want to place them anywhere other than root.
 476 #
 477
 478 #export INSTALL_PATH=/boot
 479
 480 #
 481 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 482 # relocations required by build roots.  This is not defined in the
 483 # makefile but the arguement can be passed to make if needed.
 484 #
 485
 486 MODLIB  := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 487 export MODLIB
 488
 489
 490 ifeq ($(KBUILD_EXTMOD),)
 491 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/
 492
 493 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 494                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 495                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 496
 497 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 498                      $(init-n) $(init-) \
 499                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 500                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 501
 502 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 503 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 504 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 505 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 506 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 507 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 508 libs-y          := $(libs-y1) $(libs-y2)
 509
 510 # Build vmlinux
 511 # ---------------------------------------------------------------------------
 512
 513 #       This is a bit tricky: If we need to relink vmlinux, we want
 514 #       the version number incremented, which means recompile init/version.o
 515 #       and relink init/init.o. However, we cannot do this during the
 516 #       normal descending-into-subdirs phase, since at that time
 517 #       we cannot yet know if we will need to relink vmlinux.
 518 #       So we descend into init/ inside the rule for vmlinux again.
 519 head-y += $(HEAD)
 520 vmlinux-objs := $(head-y) $(init-y) $(core-y) $(libs-y) $(drivers-y) $(net-y)
 521
 522 quiet_cmd_vmlinux__ = LD      $@
 523 define cmd_vmlinux__
 524         $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) $(head-y) $(init-y) \
 525         --start-group \
 526         $(core-y) \
 527         $(libs-y) \
 528         $(drivers-y) \
 529         $(net-y) \
 530         --end-group \
 531         $(filter .tmp_kallsyms%,$^) \
 532         -o $@
 533 endef
 534
 535 #       set -e makes the rule exit immediately on error
 536
 537 define rule_vmlinux__
 538         +set -e;                                                        \
 539         $(if $(filter .tmp_kallsyms%,$^),,                              \
 540           echo '  GEN     .version';                                    \
 541           . $(srctree)/scripts/mkversion > .tmp_version;                \
 542           mv -f .tmp_version .version;                                  \
 543           $(MAKE) $(build)=init;                                        \
 544         )                                                               \
 545         $(if $($(quiet)cmd_vmlinux__),                                  \
 546           echo '  $($(quiet)cmd_vmlinux__)' &&)                         \
 547         $(cmd_vmlinux__);                                               \
 548         echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 549 endef
 550
 551 do_system_map = $(NM) $(1) | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > $(2)
 552
 553 LDFLAGS_vmlinux += -T arch/$(ARCH)/kernel/vmlinux.lds.s
 554
 555 #       Generate section listing all symbols and add it into vmlinux
 556 #       It's a three stage process:
 557 #       o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 558 #         empty
 559 #         Running kallsyms on that gives us .tmp_kallsyms1.o with
 560 #         the right size
 561 #       o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 562 #         but due to the added section, some addresses have shifted
 563 #         From here, we generate a correct .tmp_kallsyms2.o
 564 #       o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 565 #       o Verify that the System.map from vmlinux matches the map from
 566 #         .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 567 #       o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 568 #         .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 569 #         temporary bypass to allow the kernel to be built while the
 570 #         maintainers work out what went wrong with kallsyms.
 571
 572 ifdef CONFIG_KALLSYMS
 573
 574 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 575 last_kallsyms := 3
 576 else
 577 last_kallsyms := 2
 578 endif
 579
 580 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 581
 582 define rule_verify_kallsyms
 583         @$(call do_system_map, .tmp_vmlinux$(last_kallsyms), .tmp_System.map)
 584         @cmp -s System.map .tmp_System.map || \
 585                 (echo Inconsistent kallsyms data, try setting CONFIG_KALLSYMS_EXTRA_PASS ; rm .tmp_kallsyms* ; false)
 586 endef
 587
 588 quiet_cmd_kallsyms = KSYM    $@
 589 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) $(foreach x,$(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 590
 591 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 592         $(call if_changed_dep,as_o_S)
 593
 594 .tmp_kallsyms%.S: .tmp_vmlinux%
 595         $(call cmd,kallsyms)
 596
 597 .tmp_vmlinux1: $(vmlinux-objs) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 598         $(call if_changed_rule,vmlinux__)
 599
 600 .tmp_vmlinux2: $(vmlinux-objs) .tmp_kallsyms1.o arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 601         $(call if_changed_rule,vmlinux__)
 602
 603 .tmp_vmlinux3: $(vmlinux-objs) .tmp_kallsyms2.o arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 604         $(call if_changed_rule,vmlinux__)
 605
 606 endif
 607
 608 #       Finally the vmlinux rule
 609
 610 define rule_vmlinux
 611         $(rule_vmlinux__); \
 612         $(call do_system_map, $@, System.map)
 613         $(rule_verify_kallsyms)
 614 endef
 615
 616 vmlinux: $(vmlinux-objs) $(kallsyms.o) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 617         $(call if_changed_rule,vmlinux)
 618
 619 #       The actual objects are generated when descending,
 620 #       make sure no implicit rule kicks in
 621
 622 $(sort $(vmlinux-objs)) arch/$(ARCH)/kernel/vmlinux.lds.s: $(vmlinux-dirs) ;
 623
 624 #       Handle descending into subdirectories listed in $(vmlinux-dirs)
 625
 626 .PHONY: $(vmlinux-dirs)
 627 $(vmlinux-dirs): prepare-all scripts
 628         $(Q)$(MAKE) $(build)=$@
 629
 630 # Things we need to do before we recursively start building the kernel
 631 # or the modules are listed in "prepare-all".
 632 # A multi level approach is used. prepare1 is updated first, then prepare0.
 633 # prepare-all is the collection point for the prepare targets.
 634
 635 .PHONY: prepare-all prepare prepare0 prepare1
 636
 637 # prepare1 is used to check if we are building in a separate output directory,
 638 # and if so do:
 639 # 1) Check that make has not been executed in the kernel src $(srctree)
 640 # 2) Create the include2 directory, used for the second asm symlink
 641
 642 prepare1:
 643 ifneq ($(KBUILD_SRC),)
 644         @echo '  Using $(srctree) as source for kernel'
 645         $(Q)if [ -h $(srctree)/include/asm -o -f $(srctree)/.config ]; then \
 646                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 647                 echo "  in the '$(srctree)' directory.";\
 648                 /bin/false; \
 649         fi;
 650         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 651         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 652 endif
 653
 654 prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
 655 ifneq ($(KBUILD_MODULES),)
 656         $(Q)rm -rf $(MODVERDIR)
 657         $(Q)mkdir -p $(MODVERDIR)
 658 endif
 659
 660 # All the preparing..
 661 prepare-all: prepare0 prepare
 662
 663 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 664 #       done in arch/$(ARCH)/kernel/Makefile
 665
 666 export AFLAGS_vmlinux.lds.o += -P -C -U$(ARCH)
 667
 668 # Single targets
 669 # ---------------------------------------------------------------------------
 670
 671 %.s: %.c scripts FORCE
 672         $(Q)$(MAKE) $(build)=$(@D) $@
 673 %.i: %.c scripts FORCE
 674         $(Q)$(MAKE) $(build)=$(@D) $@
 675 %.o: %.c scripts FORCE
 676         $(Q)$(MAKE) $(build)=$(@D) $@
 677 %/:      scripts prepare FORCE
 678         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
 679 %.lst: %.c scripts FORCE
 680         $(Q)$(MAKE) $(build)=$(@D) $@
 681 %.s: %.S scripts FORCE
 682         $(Q)$(MAKE) $(build)=$(@D) $@
 683 %.o: %.S scripts FORCE
 684         $(Q)$(MAKE) $(build)=$(@D) $@
 685
 686 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 687 #       hard to detect, but I suppose "make mrproper" is a good idea
 688 #       before switching between archs anyway.
 689
 690 include/asm:
 691         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 692         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 693         @ln -fsn asm-$(ARCH) $@
 694
 695 #       Split autoconf.h into include/linux/config/*
 696
 697 include/config/MARKER: include/linux/autoconf.h
 698         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 699         @scripts/basic/split-include include/linux/autoconf.h include/config
 700         @touch $@
 701
 702 # Generate some files
 703 # ---------------------------------------------------------------------------
 704
 705 #       version.h changes when $(KERNELRELEASE) etc change, as defined in
 706 #       this Makefile
 707
 708 uts_len := 64
 709
 710 define filechk_version.h
 711         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 712           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 713           exit 1; \
 714         fi; \
 715         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 716           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 717          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 718         )
 719 endef
 720
 721 include/linux/version.h: Makefile
 722         $(call filechk,version.h)
 723
 724 # ---------------------------------------------------------------------------
 725
 726 .PHONY: depend dep
 727 depend dep:
 728         @echo '*** Warning: make $@ is unnecessary now.'
 729
 730 # ---------------------------------------------------------------------------
 731 # Modules
 732
 733 ifdef CONFIG_MODULES
 734
 735 #       By default, build modules as well
 736
 737 all: modules
 738
 739 #       Build modules
 740
 741 .PHONY: modules
 742 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 743         @echo '  Building modules, stage 2.';
 744         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 745
 746
 747 # Target to prepare building external modules
 748 .PHONY: modules_prepare
 749 modules_prepare: prepare-all scripts
 750
 751 # Target to install modules
 752 .PHONY: modules_install
 753 modules_install: _modinst_ _modinst_post
 754
 755 .PHONY: _modinst_
 756 _modinst_:
 757         @if [ -z "`$(DEPMOD) -V | grep module-init-tools`" ]; then \
 758                 echo "Warning: you may need to install module-init-tools"; \
 759                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 760                 sleep 1; \
 761         fi
 762         @rm -rf $(MODLIB)/kernel
 763         @rm -f $(MODLIB)/build
 764         @mkdir -p $(MODLIB)/kernel
 765         @ln -s $(TOPDIR) $(MODLIB)/build
 766         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 767
 768 # If System.map exists, run depmod.  This deliberately does not have a
 769 # dependency on System.map since that would run the dependency tree on
 770 # vmlinux.  This depmod is only for convenience to give the initial
 771 # boot a modules.dep even before / is mounted read-write.  However the
 772 # boot script depmod is the master version.
 773 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 774 depmod_opts     :=
 775 else
 776 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 777 endif
 778 .PHONY: _modinst_post
 779 _modinst_post: _modinst_
 780         if [ -r System.map ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 781
 782 else # CONFIG_MODULES
 783
 784 # Modules not configured
 785 # ---------------------------------------------------------------------------
 786
 787 modules modules_install: FORCE
 788         @echo
 789         @echo "The present kernel configuration has modules disabled."
 790         @echo "Type 'make config' and enable loadable module support."
 791         @echo "Then build a kernel with module support enabled."
 792         @echo
 793         @exit 1
 794
 795 endif # CONFIG_MODULES
 796
 797 # Generate asm-offsets.h
 798 # ---------------------------------------------------------------------------
 799
 800 define filechk_gen-asm-offsets
 801         (set -e; \
 802          echo "#ifndef __ASM_OFFSETS_H__"; \
 803          echo "#define __ASM_OFFSETS_H__"; \
 804          echo "/*"; \
 805          echo " * DO NOT MODIFY."; \
 806          echo " *"; \
 807          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 808          echo " *"; \
 809          echo " */"; \
 810          echo ""; \
 811          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 812          echo ""; \
 813          echo "#endif" )
 814 endef
 815
 816
 817 ###
 818 # Cleaning is done on three levels.
 819 # make clean     Delete most generated files
 820 #                Leave enough to build external modules
 821 # make mrproper  Delete the current configuration, and all generated files
 822 # make distclean Remove editor backup files, patch leftover files and the like
 823
 824 # Directories & files removed with 'make clean'
 825 CLEAN_DIRS  += $(MODVERDIR)
 826 CLEAN_FILES +=  vmlinux System.map \
 827                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 828
 829 # Directories & files removed with 'make mrproper'
 830 MRPROPER_DIRS  += include/config include2
 831 MRPROPER_FILES += .config .config.old include/asm .version \
 832                   include/linux/autoconf.h include/linux/version.h \
 833                   Module.symvers tags TAGS cscope*
 834
 835 # clean - Delete most, but leave enough to build external modules
 836 #
 837 clean: rm-dirs  := $(CLEAN_DIRS)
 838 clean: rm-files := $(CLEAN_FILES)
 839 clean-dirs      := $(addprefix _clean_,$(vmlinux-alldirs))
 840
 841 .PHONY: $(clean-dirs) clean archclean
 842 $(clean-dirs):
 843         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 844
 845 clean: archclean $(clean-dirs)
 846         $(call cmd,rmdirs)
 847         $(call cmd,rmfiles)
 848         @find . $(RCS_FIND_IGNORE) \
 849                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 850                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 851                 -type f -print | xargs rm -f
 852
 853 # mrproper - Delete all generated files, including .config
 854 #
 855 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 856 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 857 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
 858
 859 .PHONY: $(mrproper-dirs) mrproper archmrproper
 860 $(mrproper-dirs):
 861         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 862
 863 mrproper: clean archmrproper $(mrproper-dirs)
 864         $(call cmd,rmdirs)
 865         $(call cmd,rmfiles)
 866
 867 # distclean
 868 #
 869 .PHONY: distclean
 870
 871 distclean: mrproper
 872         @find $(srctree) $(RCS_FIND_IGNORE) \
 873                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 874                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 875                 -o -name '.*.rej' -o -size 0 \
 876                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
 877                 -type f -print | xargs rm -f
 878
 879
 880 # Packaging of the kernel to various formats
 881 # ---------------------------------------------------------------------------
 882 # rpm target kept for backward compatibility
 883 package-dir     := $(srctree)/scripts/package
 884
 885 .PHONY: %-pkg rpm
 886
 887 %pkg: FORCE
 888         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
 889 rpm: FORCE
 890         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
 891
 892
 893 # Brief documentation of the typical targets used
 894 # ---------------------------------------------------------------------------
 895
 896 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
 897 boards := $(notdir $(boards))
 898
 899 help:
 900         @echo  'Cleaning targets:'
 901         @echo  '  clean           - remove most generated files but keep the config'
 902         @echo  '  mrproper        - remove all generated files + config + various backup files'
 903         @echo  ''
 904         @echo  'Configuration targets:'
 905         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
 906         @echo  ''
 907         @echo  'Other generic targets:'
 908         @echo  '  all             - Build all targets marked with [*]'
 909         @echo  '* vmlinux         - Build the bare kernel'
 910         @echo  '* modules         - Build all modules'
 911         @echo  '  modules_install - Install all modules'
 912         @echo  '  dir/            - Build all files in dir and below'
 913         @echo  '  dir/file.[ois]  - Build specified target only'
 914         @echo  '  rpm             - Build a kernel as an RPM package'
 915         @echo  '  tags/TAGS       - Generate tags file for editors'
 916         @echo  '  cscope          - Generate cscope index'
 917         @echo  '  checkstack      - Generate a list of stack hogs'
 918         @echo  'Kernel packaging:'
 919         @$(MAKE) -f $(package-dir)/Makefile help
 920         @echo  ''
 921         @echo  'Documentation targets:'
 922         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
 923         @echo  ''
 924         @echo  'Architecture specific targets ($(ARCH)):'
 925         @$(if $(archhelp),$(archhelp),\
 926                 echo '  No architecture specific help defined for $(ARCH)')
 927         @echo  ''
 928         @$(if $(boards), \
 929                 $(foreach b, $(boards), \
 930                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
 931                 echo '')
 932
 933         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
 934         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
 935         @echo  '  make C=1   [targets] Check all c source with checker tool'
 936         @echo  ''
 937         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
 938         @echo  'For further info see the ./README file'
 939
 940
 941 # Documentation targets
 942 # ---------------------------------------------------------------------------
 943 %docs: scripts_basic FORCE
 944         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
 945
 946 else # KBUILD_EXTMOD
 947
 948 ###
 949 # External module support.
 950 # When building external modules the kernel used as basis is considered
 951 # read-only, and no consistency checks are made and the make
 952 # system is not used on the basis kernel. If updates are required
 953 # in the basis kernel ordinary make commands (without M=...) must
 954 # be used.
 955 #
 956 # The following are the only valid targets when building external
 957 # modules.
 958 # make M=dir clean     Delete all automatically generated files
 959 # make M=dir modules   Make all modules in specified dir
 960 # make M=dir           Same as 'make M=dir modules'
 961 # make M=dir modules_install
 962 #                      Install the modules build in the module directory
 963 #                      Assumes install directory is already created
 964
 965 # We are always building modules
 966 KBUILD_MODULES := 1
 967 .PHONY: crmodverdir
 968 crmodverdir:
 969         $(Q)mkdir -p $(MODVERDIR)
 970
 971 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
 972 .PHONY: $(module-dirs) modules
 973 $(module-dirs): crmodverdir
 974         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
 975
 976 modules: $(module-dirs)
 977         @echo '  Building modules, stage 2.';
 978         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 979
 980 .PHONY: modules_install
 981 modules_install:
 982         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 983
 984 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
 985
 986 .PHONY: $(clean-dirs) clean
 987 $(clean-dirs):
 988         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 989
 990 clean:  rm-dirs := $(MODVERDIR)
 991 clean: $(clean-dirs)
 992         $(call cmd,rmdirs)
 993         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
 994                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 995                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 996                 -type f -print | xargs rm -f
 997
 998 help:
 999         @echo  '  Building external modules.'
1000         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1001         @echo  ''
1002         @echo  '  modules         - default target, build the module(s)'
1003         @echo  '  modules_install - install the module'
1004         @echo  '  clean           - remove generated files in module directory only'
1005         @echo  ''
1006 endif # KBUILD_EXTMOD
1007
1008 # Generate tags for editors
1009 # ---------------------------------------------------------------------------
1010
1011 define all-sources
1012         ( find . $(RCS_FIND_IGNORE) \
1013                \( -name include -o -name arch \) -prune -o \
1014                -name '*.[chS]' -print; \
1015           find arch/$(ARCH) $(RCS_FIND_IGNORE) \
1016                -name '*.[chS]' -print; \
1017           find security/selinux/include $(RCS_FIND_IGNORE) \
1018                -name '*.[chS]' -print; \
1019           find include $(RCS_FIND_IGNORE) \
1020                \( -name config -o -name 'asm-*' \) -prune \
1021                -o -name '*.[chS]' -print; \
1022           find include/asm-$(ARCH) $(RCS_FIND_IGNORE) \
1023                -name '*.[chS]' -print; \
1024           find include/asm-generic $(RCS_FIND_IGNORE) \
1025                -name '*.[chS]' -print )
1026 endef
1027
1028 quiet_cmd_cscope-file = FILELST cscope.files
1029       cmd_cscope-file = $(all-sources) > cscope.files
1030
1031 quiet_cmd_cscope = MAKE    cscope.out
1032       cmd_cscope = cscope -k -b -q
1033
1034 cscope: FORCE
1035         $(call cmd,cscope-file)
1036         $(call cmd,cscope)
1037
1038 quiet_cmd_TAGS = MAKE   $@
1039 cmd_TAGS = $(all-sources) | etags -
1040
1041 #       Exuberant ctags works better with -I
1042
1043 quiet_cmd_tags = MAKE   $@
1044 define cmd_tags
1045         rm -f $@; \
1046         CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
1047         $(all-sources) | xargs ctags $$CTAGSF -a
1048 endef
1049
1050 TAGS: FORCE
1051         $(call cmd,TAGS)
1052
1053 tags: FORCE
1054         $(call cmd,tags)
1055
1056
1057 # Scripts to check various things for consistency
1058 # ---------------------------------------------------------------------------
1059
1060 configcheck:
1061         find * $(RCS_FIND_IGNORE) \
1062                 -name '*.[hcS]' -type f -print | sort \
1063                 | xargs $(PERL) -w scripts/checkconfig.pl
1064
1065 includecheck:
1066         find * $(RCS_FIND_IGNORE) \
1067                 -name '*.[hcS]' -type f -print | sort \
1068                 | xargs $(PERL) -w scripts/checkincludes.pl
1069
1070 versioncheck:
1071         find * $(RCS_FIND_IGNORE) \
1072                 -name '*.[hcS]' -type f -print | sort \
1073                 | xargs $(PERL) -w scripts/checkversion.pl
1074
1075 buildcheck:
1076         $(PERL) scripts/reference_discarded.pl
1077         $(PERL) scripts/reference_init.pl
1078
1079 endif #ifeq ($(config-targets),1)
1080 endif #ifeq ($(mixed-targets),1)
1081
1082 .PHONY: checkstack
1083 checkstack:
1084         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1085         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1086
1087 # FIXME Should go into a make.lib or something
1088 # ===========================================================================
1089
1090 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1091       cmd_rmdirs = rm -rf $(rm-dirs)
1092
1093 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1094       cmd_rmfiles = rm -f $(rm-files)
1095
1096
1097 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1098           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1099           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1100
1101 quiet_cmd_as_o_S = AS      $@
1102 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1103
1104 # read all saved command lines
1105
1106 targets := $(wildcard $(sort $(targets)))
1107 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1108
1109 ifneq ($(cmd_files),)
1110   $(cmd_files): ;       # Do not try to update included dependency files
1111   include $(cmd_files)
1112 endif
1113
1114 # execute the command and also postprocess generated .d dependencies
1115 # file
1116
1117 if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
1118                           $(filter-out $(cmd_$(1)),$(cmd_$@))\
1119                           $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1120         @set -e; \
1121         $(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1122         $(cmd_$(1)); \
1123         scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
1124         rm -f $(depfile); \
1125         mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
1126
1127 # Usage: $(call if_changed_rule,foo)
1128 # will check if $(cmd_foo) changed, or any of the prequisites changed,
1129 # and if so will execute $(rule_foo)
1130
1131 if_changed_rule = $(if $(strip $? \
1132                                $(filter-out $(cmd_$(1)),$(cmd_$(@F)))\
1133                                $(filter-out $(cmd_$(@F)),$(cmd_$(1)))),\
1134                        @$(rule_$(1)))
1135
1136 # If quiet is set, only print short version of command
1137
1138 cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
1139
1140 # filechk is used to check if the content of a generated file is updated.
1141 # Sample usage:
1142 # define filechk_sample
1143 #       echo $KERNELRELEASE
1144 # endef
1145 # version.h : Makefile
1146 #       $(call filechk,sample)
1147 # The rule defined shall write to stdout the content of the new file.
1148 # The existing file will be compared with the new one.
1149 # - If no file exist it is created
1150 # - If the content differ the new file is used
1151 # - If they are equal no change, and no timestamp update
1152
1153 define filechk
1154         @set -e;                                \
1155         echo '  CHK     $@';                    \
1156         mkdir -p $(dir $@);                     \
1157         $(filechk_$(1)) < $< > $@.tmp;          \
1158         if [ -r $@ ] && cmp -s $@ $@.tmp; then  \
1159                 rm -f $@.tmp;                   \
1160         else                                    \
1161                 echo '  UPD     $@';            \
1162                 mv -f $@.tmp $@;                \
1163         fi
1164 endef
1165
1166 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1167 # Usage:
1168 # $(Q)$(MAKE) $(build)=dir
1169 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
1170
1171 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1172 # Usage:
1173 # $(Q)$(MAKE) $(clean)=dir
1174 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1175
1176 #       $(call descend,<dir>,<target>)
1177 #       Recursively call a sub-make in <dir> with target <target>
1178 # Usage is deprecated, because make does not see this as an invocation of make.
1179 descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
1180
1181 endif   # skip-makefile
1182
1183 FORCE: