Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 25
   4 EXTRAVERSION =
   5 NAME = Funky Weasel is Jiggy wit it
   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:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoids hard-to-debug behaviour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # Add custom flags here to avoid conflict with updates
  20 EXTRAVERSION := $(EXTRAVERSION)-omap1
  21
  22 # We are using a recursive build, so we need to do a little thinking
  23 # to get the ordering right.
  24 #
  25 # Most importantly: sub-Makefiles should only ever modify files in
  26 # their own directory. If in some directory we have a dependency on
  27 # a file in another dir (which doesn't happen often, but it's often
  28 # unavoidable when linking the built-in.o targets which finally
  29 # turn into vmlinux), we will call a sub make in that other dir, and
  30 # after that we are sure that everything which is in that other dir
  31 # is now up to date.
  32 #
  33 # The only cases where we need to modify files which have global
  34 # effects are thus separated out and done before the recursive
  35 # descending is started. They are now explicitly listed as the
  36 # prepare rule.
  37
  38 # To put more focus on warnings, be less verbose as default
  39 # Use 'make V=1' to see the full commands
  40
  41 ifdef V
  42   ifeq ("$(origin V)", "command line")
  43     KBUILD_VERBOSE = $(V)
  44   endif
  45 endif
  46 ifndef KBUILD_VERBOSE
  47   KBUILD_VERBOSE = 0
  48 endif
  49
  50 # Call a source code checker (by default, "sparse") as part of the
  51 # C compilation.
  52 #
  53 # Use 'make C=1' to enable checking of only re-compiled files.
  54 # Use 'make C=2' to enable checking of *all* source files, regardless
  55 # of whether they are re-compiled or not.
  56 #
  57 # See the file "Documentation/sparse.txt" for more details, including
  58 # where to get the "sparse" utility.
  59
  60 ifdef C
  61   ifeq ("$(origin C)", "command line")
  62     KBUILD_CHECKSRC = $(C)
  63   endif
  64 endif
  65 ifndef KBUILD_CHECKSRC
  66   KBUILD_CHECKSRC = 0
  67 endif
  68
  69 # Use make M=dir to specify directory of external module to build
  70 # Old syntax make ... SUBDIRS=$PWD is still supported
  71 # Setting the environment variable KBUILD_EXTMOD take precedence
  72 ifdef SUBDIRS
  73   KBUILD_EXTMOD ?= $(SUBDIRS)
  74 endif
  75 ifdef M
  76   ifeq ("$(origin M)", "command line")
  77     KBUILD_EXTMOD := $(M)
  78   endif
  79 endif
  80
  81
  82 # kbuild supports saving output files in a separate directory.
  83 # To locate output files in a separate directory two syntaxes are supported.
  84 # In both cases the working directory must be the root of the kernel src.
  85 # 1) O=
  86 # Use "make O=dir/to/store/output/files/"
  87 #
  88 # 2) Set KBUILD_OUTPUT
  89 # Set the environment variable KBUILD_OUTPUT to point to the directory
  90 # where the output files shall be placed.
  91 # export KBUILD_OUTPUT=dir/to/store/output/files/
  92 # make
  93 #
  94 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  95 # variable.
  96
  97
  98 # KBUILD_SRC is set on invocation of make in OBJ directory
  99 # KBUILD_SRC is not intended to be used by the regular user (for now)
 100 ifeq ($(KBUILD_SRC),)
 101
 102 # OK, Make called in directory where kernel src resides
 103 # Do we want to locate output files in a separate directory?
 104 ifdef O
 105   ifeq ("$(origin O)", "command line")
 106     KBUILD_OUTPUT := $(O)
 107   endif
 108 endif
 109
 110 # That's our default target when none is given on the command line
 111 PHONY := _all
 112 _all:
 113
 114 # Cancel implicit rules on top Makefile
 115 $(CURDIR)/Makefile Makefile: ;
 116
 117 ifneq ($(KBUILD_OUTPUT),)
 118 # Invoke a second make in the output directory, passing relevant variables
 119 # check that the output directory actually exists
 120 saved-output := $(KBUILD_OUTPUT)
 121 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 122 $(if $(KBUILD_OUTPUT),, \
 123      $(error output directory "$(saved-output)" does not exist))
 124
 125 PHONY += $(MAKECMDGOALS) sub-make
 126
 127 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 128         $(Q)@:
 129
 130 sub-make: FORCE
 131         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 132         KBUILD_SRC=$(CURDIR) \
 133         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 134         $(filter-out _all sub-make,$(MAKECMDGOALS))
 135
 136 # Leave processing to above invocation of make
 137 skip-makefile := 1
 138 endif # ifneq ($(KBUILD_OUTPUT),)
 139 endif # ifeq ($(KBUILD_SRC),)
 140
 141 # We process the rest of the Makefile if this is the final invocation of make
 142 ifeq ($(skip-makefile),)
 143
 144 # If building an external module we do not care about the all: rule
 145 # but instead _all depend on modules
 146 PHONY += all
 147 ifeq ($(KBUILD_EXTMOD),)
 148 _all: all
 149 else
 150 _all: modules
 151 endif
 152
 153 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 154 TOPDIR          := $(srctree)
 155 # FIXME - TOPDIR is obsolete, use srctree/objtree
 156 objtree         := $(CURDIR)
 157 src             := $(srctree)
 158 obj             := $(objtree)
 159
 160 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 161
 162 export srctree objtree VPATH TOPDIR
 163
 164
 165 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 166 # first, and if a usermode build is happening, the "ARCH=um" on the command
 167 # line overrides the setting of ARCH below.  If a native build is happening,
 168 # then ARCH is assigned, getting whatever value it gets normally, and
 169 # SUBARCH is subsequently ignored.
 170
 171 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 172                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 173                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 174                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 175                                   -e s/sh.*/sh/ )
 176
 177 SUBARCH := arm
 178
 179 # Cross compiling and selecting different set of gcc/bin-utils
 180 # ---------------------------------------------------------------------------
 181 #
 182 # When performing cross compilation for other architectures ARCH shall be set
 183 # to the target architecture. (See arch/* for the possibilities).
 184 # ARCH can be set during invocation of make:
 185 # make ARCH=ia64
 186 # Another way is to have ARCH set in the environment.
 187 # The default ARCH is the host where make is executed.
 188
 189 # CROSS_COMPILE specify the prefix used for all executables used
 190 # during compilation. Only gcc and related bin-utils executables
 191 # are prefixed with $(CROSS_COMPILE).
 192 # CROSS_COMPILE can be set on the command line
 193 # make CROSS_COMPILE=ia64-linux-
 194 # Alternatively CROSS_COMPILE can be set in the environment.
 195 # Default value for CROSS_COMPILE is not to prefix executables
 196 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 197 export KBUILD_BUILDHOST := $(SUBARCH)
 198 ARCH            ?= $(SUBARCH)
 199 CROSS_COMPILE   ?= arm-linux-
 200
 201 # Architecture as present in compile.h
 202 UTS_MACHINE     := $(ARCH)
 203 SRCARCH         := $(ARCH)
 204
 205 # Additional ARCH settings for x86
 206 ifeq ($(ARCH),i386)
 207         SRCARCH := x86
 208 endif
 209 ifeq ($(ARCH),x86_64)
 210         SRCARCH := x86
 211 endif
 212
 213 KCONFIG_CONFIG  ?= .config
 214
 215 # SHELL used by kbuild
 216 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 217           else if [ -x /bin/bash ]; then echo /bin/bash; \
 218           else echo sh; fi ; fi)
 219
 220 HOSTCC       = gcc
 221 HOSTCXX      = g++
 222 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 223 HOSTCXXFLAGS = -O2
 224
 225 # Decide whether to build built-in, modular, or both.
 226 # Normally, just do built-in.
 227
 228 KBUILD_MODULES :=
 229 KBUILD_BUILTIN := 1
 230
 231 #       If we have only "make modules", don't compile built-in objects.
 232 #       When we're building modules with modversions, we need to consider
 233 #       the built-in objects during the descend as well, in order to
 234 #       make sure the checksums are up to date before we record them.
 235
 236 ifeq ($(MAKECMDGOALS),modules)
 237   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 238 endif
 239
 240 #       If we have "make <whatever> modules", compile modules
 241 #       in addition to whatever we do anyway.
 242 #       Just "make" or "make all" shall build modules as well
 243
 244 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 245   KBUILD_MODULES := 1
 246 endif
 247
 248 ifeq ($(MAKECMDGOALS),)
 249   KBUILD_MODULES := 1
 250 endif
 251
 252 export KBUILD_MODULES KBUILD_BUILTIN
 253 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 254
 255 # Beautify output
 256 # ---------------------------------------------------------------------------
 257 #
 258 # Normally, we echo the whole command before executing it. By making
 259 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 260 # $(quiet) to choose other forms of output instead, e.g.
 261 #
 262 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 263 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 264 #
 265 # If $(quiet) is empty, the whole command will be printed.
 266 # If it is set to "quiet_", only the short version will be printed.
 267 # If it is set to "silent_", nothing will be printed at all, since
 268 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 269 #
 270 # A simple variant is to prefix commands with $(Q) - that's useful
 271 # for commands that shall be hidden in non-verbose mode.
 272 #
 273 #       $(Q)ln $@ :<
 274 #
 275 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 276 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 277
 278 ifeq ($(KBUILD_VERBOSE),1)
 279   quiet =
 280   Q =
 281 else
 282   quiet=quiet_
 283   Q = @
 284 endif
 285
 286 # If the user is running make -s (silent mode), suppress echoing of
 287 # commands
 288
 289 ifneq ($(findstring s,$(MAKEFLAGS)),)
 290   quiet=silent_
 291 endif
 292
 293 export quiet Q KBUILD_VERBOSE
 294
 295
 296 # Look for make include files relative to root of kernel src
 297 MAKEFLAGS += --include-dir=$(srctree)
 298
 299 # We need some generic definitions (do not try to remake the file).
 300 $(srctree)/scripts/Kbuild.include: ;
 301 include $(srctree)/scripts/Kbuild.include
 302
 303 # Make variables (CC, etc...)
 304
 305 AS              = $(CROSS_COMPILE)as
 306 LD              = $(CROSS_COMPILE)ld
 307 CC              = $(CROSS_COMPILE)gcc
 308 CPP             = $(CC) -E
 309 AR              = $(CROSS_COMPILE)ar
 310 NM              = $(CROSS_COMPILE)nm
 311 STRIP           = $(CROSS_COMPILE)strip
 312 OBJCOPY         = $(CROSS_COMPILE)objcopy
 313 OBJDUMP         = $(CROSS_COMPILE)objdump
 314 AWK             = awk
 315 GENKSYMS        = scripts/genksyms/genksyms
 316 DEPMOD          = /sbin/depmod
 317 KALLSYMS        = scripts/kallsyms
 318 PERL            = perl
 319 CHECK           = sparse
 320
 321 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 322 MODFLAGS        = -DMODULE
 323 CFLAGS_MODULE   = $(MODFLAGS)
 324 AFLAGS_MODULE   = $(MODFLAGS)
 325 LDFLAGS_MODULE  =
 326 CFLAGS_KERNEL   =
 327 AFLAGS_KERNEL   =
 328
 329
 330 # Use LINUXINCLUDE when you must reference the include/ directory.
 331 # Needed to be compatible with the O= option
 332 LINUXINCLUDE    := -Iinclude \
 333                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 334                    -include include/linux/autoconf.h
 335
 336 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
 337
 338 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 339                    -fno-strict-aliasing -fno-common \
 340                    -Werror-implicit-function-declaration
 341 KBUILD_AFLAGS   := -D__ASSEMBLY__
 342
 343 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 344 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 345 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 346
 347 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 348 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 349 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 350 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 351
 352 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 353 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 354 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 355
 356 # When compiling out-of-tree modules, put MODVERDIR in the module
 357 # tree rather than in the kernel tree. The kernel tree might
 358 # even be read-only.
 359 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 360
 361 # Files to ignore in find ... statements
 362
 363 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 364 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 365
 366 # ===========================================================================
 367 # Rules shared between *config targets and build targets
 368
 369 # Basic helpers built in scripts/
 370 PHONY += scripts_basic
 371 scripts_basic:
 372         $(Q)$(MAKE) $(build)=scripts/basic
 373
 374 # To avoid any implicit rule to kick in, define an empty command.
 375 scripts/basic/%: scripts_basic ;
 376
 377 PHONY += outputmakefile
 378 # outputmakefile generates a Makefile in the output directory, if using a
 379 # separate output directory. This allows convenient use of make in the
 380 # output directory.
 381 outputmakefile:
 382 ifneq ($(KBUILD_SRC),)
 383         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 384             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 385 endif
 386
 387 # To make sure we do not include .config for any of the *config targets
 388 # catch them early, and hand them over to scripts/kconfig/Makefile
 389 # It is allowed to specify more targets when calling make, including
 390 # mixing *config targets and build targets.
 391 # For example 'make oldconfig all'.
 392 # Detect when mixed targets is specified, and make a second invocation
 393 # of make so .config is not included in this case either (for *config).
 394
 395 no-dot-config-targets := clean mrproper distclean \
 396                          cscope TAGS tags help %docs check% \
 397                          include/linux/version.h headers_% \
 398                          kernelrelease kernelversion
 399
 400 config-targets := 0
 401 mixed-targets  := 0
 402 dot-config     := 1
 403
 404 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 405         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 406                 dot-config := 0
 407         endif
 408 endif
 409
 410 ifeq ($(KBUILD_EXTMOD),)
 411         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 412                 config-targets := 1
 413                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 414                         mixed-targets := 1
 415                 endif
 416         endif
 417 endif
 418
 419 ifeq ($(mixed-targets),1)
 420 # ===========================================================================
 421 # We're called with mixed targets (*config and build targets).
 422 # Handle them one by one.
 423
 424 %:: FORCE
 425         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 426
 427 else
 428 ifeq ($(config-targets),1)
 429 # ===========================================================================
 430 # *config targets only - make sure prerequisites are updated, and descend
 431 # in scripts/kconfig to make the *config target
 432
 433 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 434 # KBUILD_DEFCONFIG may point out an alternative default configuration
 435 # used for 'make defconfig'
 436 include $(srctree)/arch/$(SRCARCH)/Makefile
 437 export KBUILD_DEFCONFIG
 438
 439 config %config: scripts_basic outputmakefile FORCE
 440         $(Q)mkdir -p include/linux include/config
 441         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 442
 443 else
 444 # ===========================================================================
 445 # Build targets only - this includes vmlinux, arch specific targets, clean
 446 # targets and others. In general all targets except *config targets.
 447
 448 ifeq ($(KBUILD_EXTMOD),)
 449 # Additional helpers built in scripts/
 450 # Carefully list dependencies so we do not try to build scripts twice
 451 # in parallel
 452 PHONY += scripts
 453 scripts: scripts_basic include/config/auto.conf
 454         $(Q)$(MAKE) $(build)=$(@)
 455
 456 # Objects we will link into vmlinux / subdirs we need to visit
 457 init-y          := init/
 458 drivers-y       := drivers/ sound/
 459 net-y           := net/
 460 libs-y          := lib/
 461 core-y          := usr/
 462 endif # KBUILD_EXTMOD
 463
 464 ifeq ($(dot-config),1)
 465 # Read in config
 466 -include include/config/auto.conf
 467
 468 ifeq ($(KBUILD_EXTMOD),)
 469 # Read in dependencies to all Kconfig* files, make sure to run
 470 # oldconfig if changes are detected.
 471 -include include/config/auto.conf.cmd
 472
 473 # To avoid any implicit rule to kick in, define an empty command
 474 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 475
 476 # If .config is newer than include/config/auto.conf, someone tinkered
 477 # with it and forgot to run make oldconfig.
 478 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 479 # we execute the config step to be sure to catch updated Kconfig files
 480 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 481         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 482 else
 483 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 484 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 485 PHONY += include/config/auto.conf
 486
 487 include/config/auto.conf:
 488         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 489         echo;                                                           \
 490         echo "  ERROR: Kernel configuration is invalid.";               \
 491         echo "         include/linux/autoconf.h or $@ are missing.";    \
 492         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 493         echo;                                                           \
 494         /bin/false)
 495
 496 endif # KBUILD_EXTMOD
 497
 498 else
 499 # Dummy target needed, because used as prerequisite
 500 include/config/auto.conf: ;
 501 endif # $(dot-config)
 502
 503 # The all: target is the default when no target is given on the
 504 # command line.
 505 # This allow a user to issue only 'make' to build a kernel including modules
 506 # Defaults vmlinux but it is usually overridden in the arch makefile
 507 all: vmlinux
 508
 509 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 510 KBUILD_CFLAGS   += -Os
 511 else
 512 KBUILD_CFLAGS   += -O2
 513 endif
 514
 515 # Force gcc to behave correct even for buggy distributions
 516 # Arch Makefiles may override this setting
 517 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 518
 519 include $(srctree)/arch/$(SRCARCH)/Makefile
 520
 521 ifdef CONFIG_FRAME_POINTER
 522 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 523 else
 524 KBUILD_CFLAGS   += -fomit-frame-pointer
 525 endif
 526
 527 ifdef CONFIG_DEBUG_INFO
 528 KBUILD_CFLAGS   += -g
 529 KBUILD_AFLAGS   += -gdwarf-2
 530 endif
 531
 532 # We trigger additional mismatches with less inlining
 533 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 534 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 535 endif
 536
 537 # arch Makefile may override CC so keep this after arch Makefile is included
 538 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 539 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 540
 541 # warn about C99 declaration after statement
 542 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 543
 544 # disable pointer signed / unsigned warnings in gcc 4.0
 545 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 546
 547 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 548 # But warn user when we do so
 549 warn-assign = \
 550 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 551
 552 ifneq ($(KCPPFLAGS),)
 553         $(call warn-assign,CPPFLAGS)
 554         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 555 endif
 556 ifneq ($(KAFLAGS),)
 557         $(call warn-assign,AFLAGS)
 558         KBUILD_AFLAGS += $(KAFLAGS)
 559 endif
 560 ifneq ($(KCFLAGS),)
 561         $(call warn-assign,CFLAGS)
 562         KBUILD_CFLAGS += $(KCFLAGS)
 563 endif
 564
 565 # Use --build-id when available.
 566 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 567                               $(call ld-option, -Wl$(comma)--build-id,))
 568 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 569 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 570
 571 # Default kernel image to build when no specific target is given.
 572 # KBUILD_IMAGE may be overruled on the command line or
 573 # set in the environment
 574 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 575 # this default value
 576 export KBUILD_IMAGE ?= vmlinux
 577
 578 #
 579 # INSTALL_PATH specifies where to place the updated kernel and system map
 580 # images. Default is /boot, but you can set it to other values
 581 export  INSTALL_PATH ?= /boot
 582
 583 #
 584 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 585 # relocations required by build roots.  This is not defined in the
 586 # makefile but the argument can be passed to make if needed.
 587 #
 588
 589 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 590 export MODLIB
 591
 592 #
 593 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 594 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 595 #  the default option --strip-debug will be used.  Otherwise,
 596 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 597
 598 ifdef INSTALL_MOD_STRIP
 599 ifeq ($(INSTALL_MOD_STRIP),1)
 600 mod_strip_cmd = $(STRIP) --strip-debug
 601 else
 602 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 603 endif # INSTALL_MOD_STRIP=1
 604 else
 605 mod_strip_cmd = true
 606 endif # INSTALL_MOD_STRIP
 607 export mod_strip_cmd
 608
 609
 610 ifeq ($(KBUILD_EXTMOD),)
 611 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 612
 613 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 614                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 615                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 616
 617 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 618                      $(init-n) $(init-) \
 619                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 620                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 621
 622 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 623 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 624 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 625 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 626 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 627 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 628 libs-y          := $(libs-y1) $(libs-y2)
 629
 630 # Build vmlinux
 631 # ---------------------------------------------------------------------------
 632 # vmlinux is built from the objects selected by $(vmlinux-init) and
 633 # $(vmlinux-main). Most are built-in.o files from top-level directories
 634 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 635 # Ordering when linking is important, and $(vmlinux-init) must be first.
 636 #
 637 # vmlinux
 638 #   ^
 639 #   |
 640 #   +-< $(vmlinux-init)
 641 #   |   +--< init/version.o + more
 642 #   |
 643 #   +--< $(vmlinux-main)
 644 #   |    +--< driver/built-in.o mm/built-in.o + more
 645 #   |
 646 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 647 #
 648 # vmlinux version (uname -v) cannot be updated during normal
 649 # descending-into-subdirs phase since we do not yet know if we need to
 650 # update vmlinux.
 651 # Therefore this step is delayed until just before final link of vmlinux -
 652 # except in the kallsyms case where it is done just before adding the
 653 # symbols to the kernel.
 654 #
 655 # System.map is generated to document addresses of all kernel symbols
 656
 657 vmlinux-init := $(head-y) $(init-y)
 658 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 659 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 660 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 661 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 662
 663 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 664 # May be overridden by arch/$(ARCH)/Makefile
 665 quiet_cmd_vmlinux__ ?= LD      $@
 666       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 667       -T $(vmlinux-lds) $(vmlinux-init)                          \
 668       --start-group $(vmlinux-main) --end-group                  \
 669       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 670
 671 # Generate new vmlinux version
 672 quiet_cmd_vmlinux_version = GEN     .version
 673       cmd_vmlinux_version = set -e;                     \
 674         if [ ! -r .version ]; then                      \
 675           rm -f .version;                               \
 676           echo 1 >.version;                             \
 677         else                                            \
 678           mv .version .old_version;                     \
 679           expr 0$$(cat .old_version) + 1 >.version;     \
 680         fi;                                             \
 681         $(MAKE) $(build)=init
 682
 683 # Generate System.map
 684 quiet_cmd_sysmap = SYSMAP
 685       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 686
 687 # Link of vmlinux
 688 # If CONFIG_KALLSYMS is set .version is already updated
 689 # Generate System.map and verify that the content is consistent
 690 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 691 # First command is ':' to allow us to use + in front of the rule
 692 define rule_vmlinux__
 693         :
 694         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 695
 696         $(call cmd,vmlinux__)
 697         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 698
 699         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 700           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 701         $(cmd_sysmap) $@ System.map;                                         \
 702         if [ $$? -ne 0 ]; then                                               \
 703                 rm -f $@;                                                    \
 704                 /bin/false;                                                  \
 705         fi;
 706         $(verify_kallsyms)
 707 endef
 708
 709
 710 ifdef CONFIG_KALLSYMS
 711 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 712 # It's a three stage process:
 713 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 714 #   empty
 715 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 716 #   the right size - vmlinux version (uname -v) is updated during this step
 717 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 718 #   but due to the added section, some addresses have shifted.
 719 #   From here, we generate a correct .tmp_kallsyms2.o
 720 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 721 # o Verify that the System.map from vmlinux matches the map from
 722 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 723 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 724 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 725 #   temporary bypass to allow the kernel to be built while the
 726 #   maintainers work out what went wrong with kallsyms.
 727
 728 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 729 last_kallsyms := 3
 730 else
 731 last_kallsyms := 2
 732 endif
 733
 734 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 735
 736 define verify_kallsyms
 737         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 738           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 739           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 740         $(Q)cmp -s System.map .tmp_System.map ||                             \
 741                 (echo Inconsistent kallsyms data;                            \
 742                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 743                  rm .tmp_kallsyms* ; /bin/false )
 744 endef
 745
 746 # Update vmlinux version before link
 747 # Use + in front of this rule to silent warning about make -j1
 748 # First command is ':' to allow us to use + in front of this rule
 749 cmd_ksym_ld = $(cmd_vmlinux__)
 750 define rule_ksym_ld
 751         :
 752         +$(call cmd,vmlinux_version)
 753         $(call cmd,vmlinux__)
 754         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 755 endef
 756
 757 # Generate .S file with all kernel symbols
 758 quiet_cmd_kallsyms = KSYM    $@
 759       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 760                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 761
 762 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 763         $(call if_changed_dep,as_o_S)
 764
 765 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 766         $(call cmd,kallsyms)
 767
 768 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 769 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 770         $(call if_changed_rule,ksym_ld)
 771
 772 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 773         $(call if_changed,vmlinux__)
 774
 775 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 776         $(call if_changed,vmlinux__)
 777
 778 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 779 $(KALLSYMS): scripts ;
 780
 781 # Generate some data for debugging strange kallsyms problems
 782 debug_kallsyms: .tmp_map$(last_kallsyms)
 783
 784 .tmp_map%: .tmp_vmlinux% FORCE
 785         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 786
 787 .tmp_map3: .tmp_map2
 788
 789 .tmp_map2: .tmp_map1
 790
 791 endif # ifdef CONFIG_KALLSYMS
 792
 793 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 794 # relevant sections renamed as per the linker script.
 795 quiet_cmd_vmlinux-modpost = LD      $@
 796       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 797          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 798          $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
 799 define rule_vmlinux-modpost
 800         :
 801         +$(call cmd,vmlinux-modpost)
 802         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 803         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 804 endef
 805
 806 # vmlinux image - including updated kernel symbols
 807 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 808 ifdef CONFIG_HEADERS_CHECK
 809         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 810 endif
 811 ifdef CONFIG_SAMPLES
 812         $(Q)$(MAKE) $(build)=samples
 813 endif
 814         $(call vmlinux-modpost)
 815         $(call if_changed_rule,vmlinux__)
 816         $(Q)rm -f .old_version
 817
 818 # build vmlinux.o first to catch section mismatch errors early
 819 ifdef CONFIG_KALLSYMS
 820 .tmp_vmlinux1: vmlinux.o
 821 endif
 822 vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE
 823         $(call if_changed_rule,vmlinux-modpost)
 824
 825 # The actual objects are generated when descending,
 826 # make sure no implicit rule kicks in
 827 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 828
 829 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 830 # Preset locale variables to speed up the build process. Limit locale
 831 # tweaks to this spot to avoid wrong language settings when running
 832 # make menuconfig etc.
 833 # Error messages still appears in the original language
 834
 835 PHONY += $(vmlinux-dirs)
 836 $(vmlinux-dirs): prepare scripts
 837         $(Q)$(MAKE) $(build)=$@
 838
 839 # Build the kernel release string
 840 #
 841 # The KERNELRELEASE value built here is stored in the file
 842 # include/config/kernel.release, and is used when executing several
 843 # make targets, such as "make install" or "make modules_install."
 844 #
 845 # The eventual kernel release string consists of the following fields,
 846 # shown in a hierarchical format to show how smaller parts are concatenated
 847 # to form the larger and final value, with values coming from places like
 848 # the Makefile, kernel config options, make command line options and/or
 849 # SCM tag information.
 850 #
 851 #       $(KERNELVERSION)
 852 #         $(VERSION)                    eg, 2
 853 #         $(PATCHLEVEL)                 eg, 6
 854 #         $(SUBLEVEL)                   eg, 18
 855 #         $(EXTRAVERSION)               eg, -rc6
 856 #       $(localver-full)
 857 #         $(localver)
 858 #           localversion*               (files without backups, containing '~')
 859 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 860 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 861 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 862 #           $(LOCALVERSION)             (from make command line if provided)
 863 #
 864 #  Note how the final $(localver-auto) string is included *only* if the
 865 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 866 # moment, only git is supported but other SCMs can edit the script
 867 # scripts/setlocalversion and add the appropriate checks as needed.
 868
 869 pattern = ".*/localversion[^~]*"
 870 string  = $(shell cat /dev/null \
 871            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 872
 873 localver = $(subst $(space),, $(string) \
 874                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 875
 876 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 877 # and if the SCM is know a tag from the SCM is appended.
 878 # The appended tag is determined by the SCM used.
 879 #
 880 # Currently, only git is supported.
 881 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 882 # checks as needed.
 883 ifdef CONFIG_LOCALVERSION_AUTO
 884         _localver-auto = $(shell $(CONFIG_SHELL) \
 885                           $(srctree)/scripts/setlocalversion $(srctree))
 886         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 887 endif
 888
 889 localver-full = $(localver)$(localver-auto)
 890
 891 # Store (new) KERNELRELASE string in include/config/kernel.release
 892 kernelrelease = $(KERNELVERSION)$(localver-full)
 893 include/config/kernel.release: include/config/auto.conf FORCE
 894         $(Q)rm -f $@
 895         $(Q)echo $(kernelrelease) > $@
 896
 897
 898 # Things we need to do before we recursively start building the kernel
 899 # or the modules are listed in "prepare".
 900 # A multi level approach is used. prepareN is processed before prepareN-1.
 901 # archprepare is used in arch Makefiles and when processed asm symlink,
 902 # version.h and scripts_basic is processed / created.
 903
 904 # Listed in dependency order
 905 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 906
 907 # prepare3 is used to check if we are building in a separate output directory,
 908 # and if so do:
 909 # 1) Check that make has not been executed in the kernel src $(srctree)
 910 # 2) Create the include2 directory, used for the second asm symlink
 911 prepare3: include/config/kernel.release
 912 ifneq ($(KBUILD_SRC),)
 913         @echo '  Using $(srctree) as source for kernel'
 914         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 915                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 916                 echo "  in the '$(srctree)' directory.";\
 917                 /bin/false; \
 918         fi;
 919         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 920         $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
 921 endif
 922
 923 # prepare2 creates a makefile if using a separate output directory
 924 prepare2: prepare3 outputmakefile
 925
 926 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 927                    include/asm include/config/auto.conf
 928         $(cmd_crmodverdir)
 929
 930 archprepare: prepare1 scripts_basic
 931
 932 prepare0: archprepare FORCE
 933         $(Q)$(MAKE) $(build)=.
 934         $(Q)$(MAKE) $(build)=. missing-syscalls
 935
 936 # All the preparing..
 937 prepare: prepare0
 938
 939 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 940 # done in arch/$(ARCH)/kernel/Makefile
 941
 942 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 943
 944 # The asm symlink changes when $(ARCH) changes.
 945 # Detect this and ask user to run make mrproper
 946
 947 include/asm: FORCE
 948         $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`;   \
 949         if [ -L include/asm ]; then                                     \
 950                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                \
 951                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 952                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 953                         exit 1;                                         \
 954                 fi;                                                     \
 955         else                                                            \
 956                 echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';          \
 957                 if [ ! -d include ]; then                               \
 958                         mkdir -p include;                               \
 959                 fi;                                                     \
 960                 ln -fsn asm-$(SRCARCH) $@;                              \
 961         fi
 962
 963 # Generate some files
 964 # ---------------------------------------------------------------------------
 965
 966 # KERNELRELEASE can change from a few different places, meaning version.h
 967 # needs to be updated, so this check is forced on all builds
 968
 969 uts_len := 64
 970 define filechk_utsrelease.h
 971         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 972           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 973           exit 1;                                                         \
 974         fi;                                                               \
 975         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 976 endef
 977
 978 define filechk_version.h
 979         (echo \#define LINUX_VERSION_CODE $(shell                             \
 980         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 981         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 982 endef
 983
 984 include/linux/version.h: $(srctree)/Makefile FORCE
 985         $(call filechk,version.h)
 986
 987 include/linux/utsrelease.h: include/config/kernel.release FORCE
 988         $(call filechk,utsrelease.h)
 989
 990 # ---------------------------------------------------------------------------
 991
 992 PHONY += depend dep
 993 depend dep:
 994         @echo '*** Warning: make $@ is unnecessary now.'
 995
 996 # ---------------------------------------------------------------------------
 997 # Kernel headers
 998 INSTALL_HDR_PATH=$(objtree)/usr
 999 export INSTALL_HDR_PATH
1000
1001 HDRFILTER=generic i386 x86_64
1002 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
1003
1004 PHONY += headers_install_all
1005 headers_install_all: include/linux/version.h scripts_basic FORCE
1006         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1007         $(Q)for arch in $(HDRARCHES); do \
1008          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
1009          done
1010
1011 PHONY += headers_install
1012 headers_install: include/linux/version.h scripts_basic FORCE
1013         @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1014           echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
1015           exit 1 ; fi
1016         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1017         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
1018
1019 PHONY += headers_check_all
1020 headers_check_all: headers_install_all
1021         $(Q)for arch in $(HDRARCHES); do \
1022          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
1023          done
1024
1025 PHONY += headers_check
1026 headers_check: headers_install
1027         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
1028
1029 # ---------------------------------------------------------------------------
1030 # Modules
1031
1032 ifdef CONFIG_MODULES
1033
1034 # By default, build modules as well
1035
1036 all: modules
1037
1038 #       Build modules
1039 #
1040 #       A module can be listed more than once in obj-m resulting in
1041 #       duplicate lines in modules.order files.  Those are removed
1042 #       using awk while concatenating to the final file.
1043
1044 PHONY += modules
1045 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1046         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1047         @echo '  Building modules, stage 2.';
1048         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1049
1050
1051 # Target to prepare building external modules
1052 PHONY += modules_prepare
1053 modules_prepare: prepare scripts
1054
1055 # Target to install modules
1056 PHONY += modules_install
1057 modules_install: _modinst_ _modinst_post
1058
1059 PHONY += _modinst_
1060 _modinst_:
1061         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1062                 echo "Warning: you may need to install module-init-tools"; \
1063                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1064                 sleep 1; \
1065         fi
1066         @rm -rf $(MODLIB)/kernel
1067         @rm -f $(MODLIB)/source
1068         @mkdir -p $(MODLIB)/kernel
1069         @ln -s $(srctree) $(MODLIB)/source
1070         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1071                 rm -f $(MODLIB)/build ; \
1072                 ln -s $(objtree) $(MODLIB)/build ; \
1073         fi
1074         @cp -f $(objtree)/modules.order $(MODLIB)/
1075         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1076
1077 # This depmod is only for convenience to give the initial
1078 # boot a modules.dep even before / is mounted read-write.  However the
1079 # boot script depmod is the master version.
1080 PHONY += _modinst_post
1081 _modinst_post: _modinst_
1082         $(call cmd,depmod)
1083
1084 else # CONFIG_MODULES
1085
1086 # Modules not configured
1087 # ---------------------------------------------------------------------------
1088
1089 modules modules_install: FORCE
1090         @echo
1091         @echo "The present kernel configuration has modules disabled."
1092         @echo "Type 'make config' and enable loadable module support."
1093         @echo "Then build a kernel with module support enabled."
1094         @echo
1095         @exit 1
1096
1097 endif # CONFIG_MODULES
1098
1099 ###
1100 # Cleaning is done on three levels.
1101 # make clean     Delete most generated files
1102 #                Leave enough to build external modules
1103 # make mrproper  Delete the current configuration, and all generated files
1104 # make distclean Remove editor backup files, patch leftover files and the like
1105
1106 # Directories & files removed with 'make clean'
1107 CLEAN_DIRS  += $(MODVERDIR)
1108 CLEAN_FILES +=  vmlinux System.map \
1109                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1110
1111 # Directories & files removed with 'make mrproper'
1112 MRPROPER_DIRS  += include/config include2 usr/include
1113 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1114                   include/linux/autoconf.h include/linux/version.h      \
1115                   include/linux/utsrelease.h                            \
1116                   Module.symvers tags TAGS cscope*
1117
1118 # clean - Delete most, but leave enough to build external modules
1119 #
1120 clean: rm-dirs  := $(CLEAN_DIRS)
1121 clean: rm-files := $(CLEAN_FILES)
1122 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1123
1124 PHONY += $(clean-dirs) clean archclean
1125 $(clean-dirs):
1126         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1127
1128 clean: archclean $(clean-dirs)
1129         $(call cmd,rmdirs)
1130         $(call cmd,rmfiles)
1131         @find . $(RCS_FIND_IGNORE) \
1132                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1133                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1134                 -o -name '*.symtypes' -o -name 'modules.order' \) \
1135                 -type f -print | xargs rm -f
1136
1137 # mrproper - Delete all generated files, including .config
1138 #
1139 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1140 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1141 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1142
1143 PHONY += $(mrproper-dirs) mrproper archmrproper
1144 $(mrproper-dirs):
1145         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1146
1147 mrproper: clean archmrproper $(mrproper-dirs)
1148         $(call cmd,rmdirs)
1149         $(call cmd,rmfiles)
1150
1151 # distclean
1152 #
1153 PHONY += distclean
1154
1155 distclean: mrproper
1156         @find $(srctree) $(RCS_FIND_IGNORE) \
1157                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1158                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1159                 -o -name '.*.rej' -o -size 0 \
1160                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1161                 -type f -print | xargs rm -f
1162
1163
1164 # Packaging of the kernel to various formats
1165 # ---------------------------------------------------------------------------
1166 # rpm target kept for backward compatibility
1167 package-dir     := $(srctree)/scripts/package
1168
1169 %pkg: include/config/kernel.release FORCE
1170         $(Q)$(MAKE) $(build)=$(package-dir) $@
1171 rpm: include/config/kernel.release FORCE
1172         $(Q)$(MAKE) $(build)=$(package-dir) $@
1173
1174
1175 # Brief documentation of the typical targets used
1176 # ---------------------------------------------------------------------------
1177
1178 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1179 boards := $(notdir $(boards))
1180
1181 help:
1182         @echo  'Cleaning targets:'
1183         @echo  '  clean           - Remove most generated files but keep the config and'
1184         @echo  '                    enough build support to build external modules'
1185         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1186         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1187         @echo  ''
1188         @echo  'Configuration targets:'
1189         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1190         @echo  ''
1191         @echo  'Other generic targets:'
1192         @echo  '  all             - Build all targets marked with [*]'
1193         @echo  '* vmlinux         - Build the bare kernel'
1194         @echo  '* modules         - Build all modules'
1195         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1196         @echo  '  dir/            - Build all files in dir and below'
1197         @echo  '  dir/file.[ois]  - Build specified target only'
1198         @echo  '  dir/file.ko     - Build module including final link'
1199         @echo  '  prepare         - Set up for building external modules'
1200         @echo  '  tags/TAGS       - Generate tags file for editors'
1201         @echo  '  cscope          - Generate cscope index'
1202         @echo  '  kernelrelease   - Output the release version string'
1203         @echo  '  kernelversion   - Output the version stored in Makefile'
1204         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1205          echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1206          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1207          fi
1208         @echo  ''
1209         @echo  'Static analysers'
1210         @echo  '  checkstack      - Generate a list of stack hogs'
1211         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1212         @echo  '  versioncheck    - Sanity check on version.h usage'
1213         @echo  '  includecheck    - Check for duplicate included header files'
1214         @echo  '  export_report   - List the usages of all exported symbols'
1215         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1216          echo  '  headers_check   - Sanity check on exported headers'; \
1217          fi
1218         @echo  ''
1219         @echo  'Kernel packaging:'
1220         @$(MAKE) $(build)=$(package-dir) help
1221         @echo  ''
1222         @echo  'Documentation targets:'
1223         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1224         @echo  ''
1225         @echo  'Architecture specific targets ($(ARCH)):'
1226         @$(if $(archhelp),$(archhelp),\
1227                 echo '  No architecture specific help defined for $(ARCH)')
1228         @echo  ''
1229         @$(if $(boards), \
1230                 $(foreach b, $(boards), \
1231                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1232                 echo '')
1233
1234         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1235         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1236         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1237         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1238         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1239         @echo  ''
1240         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1241         @echo  'For further info see the ./README file'
1242
1243
1244 # Documentation targets
1245 # ---------------------------------------------------------------------------
1246 %docs: scripts_basic FORCE
1247         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1248
1249 else # KBUILD_EXTMOD
1250
1251 ###
1252 # External module support.
1253 # When building external modules the kernel used as basis is considered
1254 # read-only, and no consistency checks are made and the make
1255 # system is not used on the basis kernel. If updates are required
1256 # in the basis kernel ordinary make commands (without M=...) must
1257 # be used.
1258 #
1259 # The following are the only valid targets when building external
1260 # modules.
1261 # make M=dir clean     Delete all automatically generated files
1262 # make M=dir modules   Make all modules in specified dir
1263 # make M=dir           Same as 'make M=dir modules'
1264 # make M=dir modules_install
1265 #                      Install the modules built in the module directory
1266 #                      Assumes install directory is already created
1267
1268 # We are always building modules
1269 KBUILD_MODULES := 1
1270 PHONY += crmodverdir
1271 crmodverdir:
1272         $(cmd_crmodverdir)
1273
1274 PHONY += $(objtree)/Module.symvers
1275 $(objtree)/Module.symvers:
1276         @test -e $(objtree)/Module.symvers || ( \
1277         echo; \
1278         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1279         echo "           is missing; modules will have no dependencies and modversions."; \
1280         echo )
1281
1282 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1283 PHONY += $(module-dirs) modules
1284 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1285         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1286
1287 modules: $(module-dirs)
1288         @echo '  Building modules, stage 2.';
1289         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1290
1291 PHONY += modules_install
1292 modules_install: _emodinst_ _emodinst_post
1293
1294 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1295 PHONY += _emodinst_
1296 _emodinst_:
1297         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1298         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1299
1300 PHONY += _emodinst_post
1301 _emodinst_post: _emodinst_
1302         $(call cmd,depmod)
1303
1304 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1305
1306 PHONY += $(clean-dirs) clean
1307 $(clean-dirs):
1308         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1309
1310 clean:  rm-dirs := $(MODVERDIR)
1311 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1312 clean: $(clean-dirs)
1313         $(call cmd,rmdirs)
1314         $(call cmd,rmfiles)
1315         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1316                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1317                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1318                 -type f -print | xargs rm -f
1319
1320 help:
1321         @echo  '  Building external modules.'
1322         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1323         @echo  ''
1324         @echo  '  modules         - default target, build the module(s)'
1325         @echo  '  modules_install - install the module'
1326         @echo  '  clean           - remove generated files in module directory only'
1327         @echo  ''
1328
1329 # Dummies...
1330 PHONY += prepare scripts
1331 prepare: ;
1332 scripts: ;
1333 endif # KBUILD_EXTMOD
1334
1335 # Generate tags for editors
1336 # ---------------------------------------------------------------------------
1337
1338 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1339 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1340 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1341
1342 ifeq ($(src),$(obj))
1343 __srctree =
1344 else
1345 __srctree = $(srctree)/
1346 endif
1347
1348 ifeq ($(ALLSOURCE_ARCHS),)
1349 ifeq ($(ARCH),um)
1350 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1351 else
1352 ALLINCLUDE_ARCHS := $(SRCARCH)
1353 endif
1354 else
1355 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1356 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1357 endif
1358
1359 ALLSOURCE_ARCHS := $(SRCARCH)
1360
1361 define find-sources
1362         ( for arch in $(ALLSOURCE_ARCHS) ; do \
1363                find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1364                     -name $1 -print; \
1365           done ; \
1366           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1367                -name $1 -print; \
1368           find $(__srctree)include $(RCS_FIND_IGNORE) \
1369                \( -name config -o -name 'asm-*' \) -prune \
1370                -o -name $1 -print; \
1371           for arch in $(ALLINCLUDE_ARCHS) ; do \
1372                find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1373                     -name $1 -print; \
1374           done ; \
1375           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1376                -name $1 -print; \
1377           find $(__srctree) $(RCS_FIND_IGNORE) \
1378                \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1379                -name $1 -print; \
1380           )
1381 endef
1382
1383 define all-sources
1384         $(call find-sources,'*.[chS]')
1385 endef
1386 define all-kconfigs
1387         $(call find-sources,'Kconfig*')
1388 endef
1389 define all-defconfigs
1390         $(call find-sources,'defconfig')
1391 endef
1392
1393 define xtags
1394         if $1 --version 2>&1 | grep -iq exuberant; then \
1395             $(all-sources) | xargs $1 -a \
1396                 -I __initdata,__exitdata,__acquires,__releases \
1397                 -I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
1398                 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1399                 --extra=+f --c-kinds=+px \
1400                 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1401             $(all-kconfigs) | xargs $1 -a \
1402                 --langdef=kconfig \
1403                 --language-force=kconfig \
1404                 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1405             $(all-defconfigs) | xargs -r $1 -a \
1406                 --langdef=dotconfig \
1407                 --language-force=dotconfig \
1408                 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1409         elif $1 --version 2>&1 | grep -iq emacs; then \
1410             $(all-sources) | xargs $1 -a; \
1411             $(all-kconfigs) | xargs $1 -a \
1412                 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1413             $(all-defconfigs) | xargs -r $1 -a \
1414                 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1415         else \
1416             $(all-sources) | xargs $1 -a; \
1417         fi
1418 endef
1419
1420 quiet_cmd_cscope-file = FILELST cscope.files
1421       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1422
1423 quiet_cmd_cscope = MAKE    cscope.out
1424       cmd_cscope = cscope -b
1425
1426 cscope: FORCE
1427         $(call cmd,cscope-file)
1428         $(call cmd,cscope)
1429
1430 quiet_cmd_TAGS = MAKE   $@
1431 define cmd_TAGS
1432         rm -f $@; \
1433         $(call xtags,etags)
1434 endef
1435
1436 TAGS: FORCE
1437         $(call cmd,TAGS)
1438
1439 quiet_cmd_tags = MAKE   $@
1440 define cmd_tags
1441         rm -f $@; \
1442         $(call xtags,ctags)
1443 endef
1444
1445 tags: FORCE
1446         $(call cmd,tags)
1447
1448
1449 # Scripts to check various things for consistency
1450 # ---------------------------------------------------------------------------
1451
1452 includecheck:
1453         find * $(RCS_FIND_IGNORE) \
1454                 -name '*.[hcS]' -type f -print | sort \
1455                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1456
1457 versioncheck:
1458         find * $(RCS_FIND_IGNORE) \
1459                 -name '*.[hcS]' -type f -print | sort \
1460                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1461
1462 namespacecheck:
1463         $(PERL) $(srctree)/scripts/namespace.pl
1464
1465 export_report:
1466         $(PERL) $(srctree)/scripts/export_report.pl
1467
1468 endif #ifeq ($(config-targets),1)
1469 endif #ifeq ($(mixed-targets),1)
1470
1471 PHONY += checkstack kernelrelease kernelversion
1472
1473 # UML needs a little special treatment here.  It wants to use the host
1474 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1475 # else wants $(ARCH), including people doing cross-builds, which means
1476 # that $(SUBARCH) doesn't work here.
1477 ifeq ($(ARCH), um)
1478 CHECKSTACK_ARCH := $(SUBARCH)
1479 else
1480 CHECKSTACK_ARCH := $(ARCH)
1481 endif
1482 checkstack:
1483         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1484         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1485
1486 kernelrelease:
1487         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1488         $(error kernelrelease not valid - run 'make prepare' to update it))
1489 kernelversion:
1490         @echo $(KERNELVERSION)
1491
1492 # Single targets
1493 # ---------------------------------------------------------------------------
1494 # Single targets are compatible with:
1495 # - build with mixed source and output
1496 # - build with separate output dir 'make O=...'
1497 # - external modules
1498 #
1499 #  target-dir => where to store outputfile
1500 #  build-dir  => directory in kernel source tree to use
1501
1502 ifeq ($(KBUILD_EXTMOD),)
1503         build-dir  = $(patsubst %/,%,$(dir $@))
1504         target-dir = $(dir $@)
1505 else
1506         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1507         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1508         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1509 endif
1510
1511 %.s: %.c prepare scripts FORCE
1512         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1513 %.i: %.c prepare scripts FORCE
1514         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1515 %.o: %.c prepare scripts FORCE
1516         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1517 %.lst: %.c prepare scripts FORCE
1518         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1519 %.s: %.S prepare scripts FORCE
1520         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1521 %.o: %.S prepare scripts FORCE
1522         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523 %.symtypes: %.c prepare scripts FORCE
1524         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525
1526 # Modules
1527 / %/: prepare scripts FORCE
1528         $(cmd_crmodverdir)
1529         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1530         $(build)=$(build-dir)
1531 %.ko: prepare scripts FORCE
1532         $(cmd_crmodverdir)
1533         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1534         $(build)=$(build-dir) $(@:.ko=.o)
1535         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1536
1537 # FIXME Should go into a make.lib or something
1538 # ===========================================================================
1539
1540 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1541       cmd_rmdirs = rm -rf $(rm-dirs)
1542
1543 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1544       cmd_rmfiles = rm -f $(rm-files)
1545
1546 # Run depmod only if we have System.map and depmod is executable
1547 # and we build for the host arch
1548 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1549       cmd_depmod = \
1550         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1551                 $(DEPMOD) -ae -F System.map                                     \
1552                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1553                 $(KERNELRELEASE);                                               \
1554         fi
1555
1556 # Create temporary dir for module support files
1557 # clean it up only when building all modules
1558 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1559                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1560
1561 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1562           $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1563           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1564
1565 quiet_cmd_as_o_S = AS      $@
1566 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1567
1568 # read all saved command lines
1569
1570 targets := $(wildcard $(sort $(targets)))
1571 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1572
1573 ifneq ($(cmd_files),)
1574   $(cmd_files): ;       # Do not try to update included dependency files
1575   include $(cmd_files)
1576 endif
1577
1578 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1579 # Usage:
1580 # $(Q)$(MAKE) $(clean)=dir
1581 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1582
1583 endif   # skip-makefile
1584
1585 PHONY += FORCE
1586 FORCE:
1587
1588 # Declare the contents of the .PHONY variable as phony.  We keep that
1589 # information in a variable se we can use it in if_changed and friends.
1590 .PHONY: $(PHONY)