Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 39
   4 EXTRAVERSION =
   5 NAME = Flesh-Eating Bats with Fangs
   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 # Avoid funny character set dependencies
  20 unexport LC_ALL
  21 LC_COLLATE=C
  22 LC_NUMERIC=C
  23 export LC_COLLATE LC_NUMERIC
  24
  25 # We are using a recursive build, so we need to do a little thinking
  26 # to get the ordering right.
  27 #
  28 # Most importantly: sub-Makefiles should only ever modify files in
  29 # their own directory. If in some directory we have a dependency on
  30 # a file in another dir (which doesn't happen often, but it's often
  31 # unavoidable when linking the built-in.o targets which finally
  32 # turn into vmlinux), we will call a sub make in that other dir, and
  33 # after that we are sure that everything which is in that other dir
  34 # is now up to date.
  35 #
  36 # The only cases where we need to modify files which have global
  37 # effects are thus separated out and done before the recursive
  38 # descending is started. They are now explicitly listed as the
  39 # prepare rule.
  40
  41 # To put more focus on warnings, be less verbose as default
  42 # Use 'make V=1' to see the full commands
  43
  44 ifeq ("$(origin V)", "command line")
  45   KBUILD_VERBOSE = $(V)
  46 endif
  47 ifndef KBUILD_VERBOSE
  48   KBUILD_VERBOSE = 0
  49 endif
  50
  51 # Call a source code checker (by default, "sparse") as part of the
  52 # C compilation.
  53 #
  54 # Use 'make C=1' to enable checking of only re-compiled files.
  55 # Use 'make C=2' to enable checking of *all* source files, regardless
  56 # of whether they are re-compiled or not.
  57 #
  58 # See the file "Documentation/sparse.txt" for more details, including
  59 # where to get the "sparse" utility.
  60
  61 ifeq ("$(origin C)", "command line")
  62   KBUILD_CHECKSRC = $(C)
  63 endif
  64 ifndef KBUILD_CHECKSRC
  65   KBUILD_CHECKSRC = 0
  66 endif
  67
  68 # Use make M=dir to specify directory of external module to build
  69 # Old syntax make ... SUBDIRS=$PWD is still supported
  70 # Setting the environment variable KBUILD_EXTMOD take precedence
  71 ifdef SUBDIRS
  72   KBUILD_EXTMOD ?= $(SUBDIRS)
  73 endif
  74
  75 ifeq ("$(origin M)", "command line")
  76   KBUILD_EXTMOD := $(M)
  77 endif
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(KBUILD_SRC),)
  98
  99 # OK, Make called in directory where kernel src resides
 100 # Do we want to locate output files in a separate directory?
 101 ifeq ("$(origin O)", "command line")
 102   KBUILD_OUTPUT := $(O)
 103 endif
 104
 105 ifeq ("$(origin W)", "command line")
 106   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 107 endif
 108
 109 # That's our default target when none is given on the command line
 110 PHONY := _all
 111 _all:
 112
 113 # Cancel implicit rules on top Makefile
 114 $(CURDIR)/Makefile Makefile: ;
 115
 116 ifneq ($(KBUILD_OUTPUT),)
 117 # Invoke a second make in the output directory, passing relevant variables
 118 # check that the output directory actually exists
 119 saved-output := $(KBUILD_OUTPUT)
 120 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 121 $(if $(KBUILD_OUTPUT),, \
 122      $(error output directory "$(saved-output)" does not exist))
 123
 124 PHONY += $(MAKECMDGOALS) sub-make
 125
 126 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 127         $(Q)@:
 128
 129 sub-make: FORCE
 130         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 131         KBUILD_SRC=$(CURDIR) \
 132         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 133         $(filter-out _all sub-make,$(MAKECMDGOALS))
 134
 135 # Leave processing to above invocation of make
 136 skip-makefile := 1
 137 endif # ifneq ($(KBUILD_OUTPUT),)
 138 endif # ifeq ($(KBUILD_SRC),)
 139
 140 # We process the rest of the Makefile if this is the final invocation of make
 141 ifeq ($(skip-makefile),)
 142
 143 # If building an external module we do not care about the all: rule
 144 # but instead _all depend on modules
 145 PHONY += all
 146 ifeq ($(KBUILD_EXTMOD),)
 147 _all: all
 148 else
 149 _all: modules
 150 endif
 151
 152 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 153 objtree         := $(CURDIR)
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH
 160
 161
 162 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 163 # first, and if a usermode build is happening, the "ARCH=um" on the command
 164 # line overrides the setting of ARCH below.  If a native build is happening,
 165 # then ARCH is assigned, getting whatever value it gets normally, and
 166 # SUBARCH is subsequently ignored.
 167
 168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                   -e s/sh[234].*/sh/ )
 173
 174 # Cross compiling and selecting different set of gcc/bin-utils
 175 # ---------------------------------------------------------------------------
 176 #
 177 # When performing cross compilation for other architectures ARCH shall be set
 178 # to the target architecture. (See arch/* for the possibilities).
 179 # ARCH can be set during invocation of make:
 180 # make ARCH=ia64
 181 # Another way is to have ARCH set in the environment.
 182 # The default ARCH is the host where make is executed.
 183
 184 # CROSS_COMPILE specify the prefix used for all executables used
 185 # during compilation. Only gcc and related bin-utils executables
 186 # are prefixed with $(CROSS_COMPILE).
 187 # CROSS_COMPILE can be set on the command line
 188 # make CROSS_COMPILE=ia64-linux-
 189 # Alternatively CROSS_COMPILE can be set in the environment.
 190 # A third alternative is to store a setting in .config so that plain
 191 # "make" in the configured kernel build directory always uses that.
 192 # Default value for CROSS_COMPILE is not to prefix executables
 193 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 194 export KBUILD_BUILDHOST := $(SUBARCH)
 195 ARCH            ?= $(SUBARCH)
 196 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 197
 198 # Architecture as present in compile.h
 199 UTS_MACHINE     := $(ARCH)
 200 SRCARCH         := $(ARCH)
 201
 202 # Additional ARCH settings for x86
 203 ifeq ($(ARCH),i386)
 204         SRCARCH := x86
 205 endif
 206 ifeq ($(ARCH),x86_64)
 207         SRCARCH := x86
 208 endif
 209
 210 # Additional ARCH settings for sparc
 211 ifeq ($(ARCH),sparc32)
 212        SRCARCH := sparc
 213 endif
 214 ifeq ($(ARCH),sparc64)
 215        SRCARCH := sparc
 216 endif
 217
 218 # Additional ARCH settings for sh
 219 ifeq ($(ARCH),sh64)
 220        SRCARCH := sh
 221 endif
 222
 223 # Additional ARCH settings for tile
 224 ifeq ($(ARCH),tilegx)
 225        SRCARCH := tile
 226 endif
 227
 228 # Where to locate arch specific headers
 229 hdr-arch  := $(SRCARCH)
 230
 231 ifeq ($(ARCH),m68knommu)
 232        hdr-arch  := m68k
 233 endif
 234
 235 KCONFIG_CONFIG  ?= .config
 236 export KCONFIG_CONFIG
 237
 238 # SHELL used by kbuild
 239 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 240           else if [ -x /bin/bash ]; then echo /bin/bash; \
 241           else echo sh; fi ; fi)
 242
 243 HOSTCC       = gcc
 244 HOSTCXX      = g++
 245 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 246 HOSTCXXFLAGS = -O2
 247
 248 # Decide whether to build built-in, modular, or both.
 249 # Normally, just do built-in.
 250
 251 KBUILD_MODULES :=
 252 KBUILD_BUILTIN := 1
 253
 254 #       If we have only "make modules", don't compile built-in objects.
 255 #       When we're building modules with modversions, we need to consider
 256 #       the built-in objects during the descend as well, in order to
 257 #       make sure the checksums are up to date before we record them.
 258
 259 ifeq ($(MAKECMDGOALS),modules)
 260   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 261 endif
 262
 263 #       If we have "make <whatever> modules", compile modules
 264 #       in addition to whatever we do anyway.
 265 #       Just "make" or "make all" shall build modules as well
 266
 267 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 268   KBUILD_MODULES := 1
 269 endif
 270
 271 ifeq ($(MAKECMDGOALS),)
 272   KBUILD_MODULES := 1
 273 endif
 274
 275 export KBUILD_MODULES KBUILD_BUILTIN
 276 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 277
 278 # Beautify output
 279 # ---------------------------------------------------------------------------
 280 #
 281 # Normally, we echo the whole command before executing it. By making
 282 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 283 # $(quiet) to choose other forms of output instead, e.g.
 284 #
 285 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 286 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 287 #
 288 # If $(quiet) is empty, the whole command will be printed.
 289 # If it is set to "quiet_", only the short version will be printed.
 290 # If it is set to "silent_", nothing will be printed at all, since
 291 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 292 #
 293 # A simple variant is to prefix commands with $(Q) - that's useful
 294 # for commands that shall be hidden in non-verbose mode.
 295 #
 296 #       $(Q)ln $@ :<
 297 #
 298 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 299 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 300
 301 ifeq ($(KBUILD_VERBOSE),1)
 302   quiet =
 303   Q =
 304 else
 305   quiet=quiet_
 306   Q = @
 307 endif
 308
 309 # If the user is running make -s (silent mode), suppress echoing of
 310 # commands
 311
 312 ifneq ($(findstring s,$(MAKEFLAGS)),)
 313   quiet=silent_
 314 endif
 315
 316 export quiet Q KBUILD_VERBOSE
 317
 318
 319 # Look for make include files relative to root of kernel src
 320 MAKEFLAGS += --include-dir=$(srctree)
 321
 322 # We need some generic definitions (do not try to remake the file).
 323 $(srctree)/scripts/Kbuild.include: ;
 324 include $(srctree)/scripts/Kbuild.include
 325
 326 # Make variables (CC, etc...)
 327
 328 AS              = $(CROSS_COMPILE)as
 329 LD              = $(CROSS_COMPILE)ld
 330 CC              = $(CROSS_COMPILE)gcc
 331 CPP             = $(CC) -E
 332 AR              = $(CROSS_COMPILE)ar
 333 NM              = $(CROSS_COMPILE)nm
 334 STRIP           = $(CROSS_COMPILE)strip
 335 OBJCOPY         = $(CROSS_COMPILE)objcopy
 336 OBJDUMP         = $(CROSS_COMPILE)objdump
 337 AWK             = awk
 338 GENKSYMS        = scripts/genksyms/genksyms
 339 INSTALLKERNEL  := installkernel
 340 DEPMOD          = /sbin/depmod
 341 KALLSYMS        = scripts/kallsyms
 342 PERL            = perl
 343 CHECK           = sparse
 344
 345 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 346                   -Wbitwise -Wno-return-void $(CF)
 347 CFLAGS_MODULE   =
 348 AFLAGS_MODULE   =
 349 LDFLAGS_MODULE  =
 350 CFLAGS_KERNEL   =
 351 AFLAGS_KERNEL   =
 352 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 353
 354
 355 # Use LINUXINCLUDE when you must reference the include/ directory.
 356 # Needed to be compatible with the O= option
 357 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include \
 358                    -Iarch/$(hdr-arch)/include/generated -Iinclude \
 359                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 360                    -include include/generated/autoconf.h
 361
 362 KBUILD_CPPFLAGS := -D__KERNEL__
 363
 364 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 365                    -fno-strict-aliasing -fno-common \
 366                    -Werror-implicit-function-declaration \
 367                    -Wno-format-security \
 368                    -fno-delete-null-pointer-checks
 369 KBUILD_AFLAGS_KERNEL :=
 370 KBUILD_CFLAGS_KERNEL :=
 371 KBUILD_AFLAGS   := -D__ASSEMBLY__
 372 KBUILD_AFLAGS_MODULE  := -DMODULE
 373 KBUILD_CFLAGS_MODULE  := -DMODULE
 374 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 375
 376 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 377 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 378 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 379
 380 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 381 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 382 export CPP AR NM STRIP OBJCOPY OBJDUMP
 383 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 384 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 385
 386 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 387 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 388 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 389 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 390 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 391 export KBUILD_ARFLAGS
 392
 393 # When compiling out-of-tree modules, put MODVERDIR in the module
 394 # tree rather than in the kernel tree. The kernel tree might
 395 # even be read-only.
 396 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 397
 398 # Files to ignore in find ... statements
 399
 400 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
 401 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 402
 403 # ===========================================================================
 404 # Rules shared between *config targets and build targets
 405
 406 # Basic helpers built in scripts/
 407 PHONY += scripts_basic
 408 scripts_basic:
 409         $(Q)$(MAKE) $(build)=scripts/basic
 410         $(Q)rm -f .tmp_quiet_recordmcount
 411
 412 # To avoid any implicit rule to kick in, define an empty command.
 413 scripts/basic/%: scripts_basic ;
 414
 415 PHONY += outputmakefile
 416 # outputmakefile generates a Makefile in the output directory, if using a
 417 # separate output directory. This allows convenient use of make in the
 418 # output directory.
 419 outputmakefile:
 420 ifneq ($(KBUILD_SRC),)
 421         $(Q)ln -fsn $(srctree) source
 422         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 423             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 424 endif
 425
 426 # Support for using generic headers in asm-generic
 427 PHONY += asm-generic
 428 asm-generic:
 429         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 430                     obj=arch/$(SRCARCH)/include/generated/asm
 431
 432 # To make sure we do not include .config for any of the *config targets
 433 # catch them early, and hand them over to scripts/kconfig/Makefile
 434 # It is allowed to specify more targets when calling make, including
 435 # mixing *config targets and build targets.
 436 # For example 'make oldconfig all'.
 437 # Detect when mixed targets is specified, and make a second invocation
 438 # of make so .config is not included in this case either (for *config).
 439
 440 no-dot-config-targets := clean mrproper distclean \
 441                          cscope gtags TAGS tags help %docs check% coccicheck \
 442                          include/linux/version.h headers_% \
 443                          kernelversion %src-pkg
 444
 445 config-targets := 0
 446 mixed-targets  := 0
 447 dot-config     := 1
 448
 449 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 450         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 451                 dot-config := 0
 452         endif
 453 endif
 454
 455 ifeq ($(KBUILD_EXTMOD),)
 456         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 457                 config-targets := 1
 458                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 459                         mixed-targets := 1
 460                 endif
 461         endif
 462 endif
 463
 464 ifeq ($(mixed-targets),1)
 465 # ===========================================================================
 466 # We're called with mixed targets (*config and build targets).
 467 # Handle them one by one.
 468
 469 %:: FORCE
 470         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 471
 472 else
 473 ifeq ($(config-targets),1)
 474 # ===========================================================================
 475 # *config targets only - make sure prerequisites are updated, and descend
 476 # in scripts/kconfig to make the *config target
 477
 478 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 479 # KBUILD_DEFCONFIG may point out an alternative default configuration
 480 # used for 'make defconfig'
 481 include $(srctree)/arch/$(SRCARCH)/Makefile
 482 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 483
 484 config: scripts_basic outputmakefile FORCE
 485         $(Q)mkdir -p include/linux include/config
 486         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 487
 488 %config: scripts_basic outputmakefile FORCE
 489         $(Q)mkdir -p include/linux include/config
 490         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 491
 492 else
 493 # ===========================================================================
 494 # Build targets only - this includes vmlinux, arch specific targets, clean
 495 # targets and others. In general all targets except *config targets.
 496
 497 ifeq ($(KBUILD_EXTMOD),)
 498 # Additional helpers built in scripts/
 499 # Carefully list dependencies so we do not try to build scripts twice
 500 # in parallel
 501 PHONY += scripts
 502 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 503         $(Q)$(MAKE) $(build)=$(@)
 504
 505 # Objects we will link into vmlinux / subdirs we need to visit
 506 init-y          := init/
 507 drivers-y       := drivers/ sound/ firmware/
 508 net-y           := net/
 509 libs-y          := lib/
 510 core-y          := usr/
 511 endif # KBUILD_EXTMOD
 512
 513 ifeq ($(dot-config),1)
 514 # Read in config
 515 -include include/config/auto.conf
 516
 517 ifeq ($(KBUILD_EXTMOD),)
 518 # Read in dependencies to all Kconfig* files, make sure to run
 519 # oldconfig if changes are detected.
 520 -include include/config/auto.conf.cmd
 521
 522 # To avoid any implicit rule to kick in, define an empty command
 523 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 524
 525 # If .config is newer than include/config/auto.conf, someone tinkered
 526 # with it and forgot to run make oldconfig.
 527 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 528 # we execute the config step to be sure to catch updated Kconfig files
 529 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 530         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 531 else
 532 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 533 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 534 PHONY += include/config/auto.conf
 535
 536 include/config/auto.conf:
 537         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 538         echo;                                                           \
 539         echo "  ERROR: Kernel configuration is invalid.";               \
 540         echo "         include/generated/autoconf.h or $@ are missing.";\
 541         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 542         echo;                                                           \
 543         /bin/false)
 544
 545 endif # KBUILD_EXTMOD
 546
 547 else
 548 # Dummy target needed, because used as prerequisite
 549 include/config/auto.conf: ;
 550 endif # $(dot-config)
 551
 552 # The all: target is the default when no target is given on the
 553 # command line.
 554 # This allow a user to issue only 'make' to build a kernel including modules
 555 # Defaults to vmlinux, but the arch makefile usually adds further targets
 556 all: vmlinux
 557
 558 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 559 KBUILD_CFLAGS   += -Os
 560 else
 561 KBUILD_CFLAGS   += -O2
 562 endif
 563
 564 include $(srctree)/arch/$(SRCARCH)/Makefile
 565
 566 ifneq ($(CONFIG_FRAME_WARN),0)
 567 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 568 endif
 569
 570 # Force gcc to behave correct even for buggy distributions
 571 ifndef CONFIG_CC_STACKPROTECTOR
 572 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 573 endif
 574
 575 # This warning generated too much noise in a regular build.
 576 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 577 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 578
 579 ifdef CONFIG_FRAME_POINTER
 580 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 581 else
 582 # Some targets (ARM with Thumb2, for example), can't be built with frame
 583 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 584 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 585 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 586 # -fomit-frame-pointer with FUNCTION_TRACER.
 587 ifndef CONFIG_FUNCTION_TRACER
 588 KBUILD_CFLAGS   += -fomit-frame-pointer
 589 endif
 590 endif
 591
 592 ifdef CONFIG_DEBUG_INFO
 593 KBUILD_CFLAGS   += -g
 594 KBUILD_AFLAGS   += -gdwarf-2
 595 endif
 596
 597 ifdef CONFIG_DEBUG_INFO_REDUCED
 598 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 599 endif
 600
 601 ifdef CONFIG_FUNCTION_TRACER
 602 KBUILD_CFLAGS   += -pg
 603 ifdef CONFIG_DYNAMIC_FTRACE
 604         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 605                 BUILD_C_RECORDMCOUNT := y
 606                 export BUILD_C_RECORDMCOUNT
 607         endif
 608 endif
 609 endif
 610
 611 # We trigger additional mismatches with less inlining
 612 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 613 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 614 endif
 615
 616 # arch Makefile may override CC so keep this after arch Makefile is included
 617 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 618 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 619
 620 # warn about C99 declaration after statement
 621 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 622
 623 # disable pointer signed / unsigned warnings in gcc 4.0
 624 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 625
 626 # disable invalid "can't wrap" optimizations for signed / pointers
 627 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 628
 629 # conserve stack if available
 630 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 631
 632 # use the deterministic mode of AR if available
 633 KBUILD_ARFLAGS := $(call ar-option,D)
 634
 635 # check for 'asm goto'
 636 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 637         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 638 endif
 639
 640 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 641 # But warn user when we do so
 642 warn-assign = \
 643 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 644
 645 ifneq ($(KCPPFLAGS),)
 646         $(call warn-assign,CPPFLAGS)
 647         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 648 endif
 649 ifneq ($(KAFLAGS),)
 650         $(call warn-assign,AFLAGS)
 651         KBUILD_AFLAGS += $(KAFLAGS)
 652 endif
 653 ifneq ($(KCFLAGS),)
 654         $(call warn-assign,CFLAGS)
 655         KBUILD_CFLAGS += $(KCFLAGS)
 656 endif
 657
 658 # Use --build-id when available.
 659 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 660                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 661 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 662 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 663
 664 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 665 LDFLAGS_vmlinux += $(call ld-option, -X,)
 666 endif
 667
 668 # Default kernel image to build when no specific target is given.
 669 # KBUILD_IMAGE may be overruled on the command line or
 670 # set in the environment
 671 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 672 # this default value
 673 export KBUILD_IMAGE ?= vmlinux
 674
 675 #
 676 # INSTALL_PATH specifies where to place the updated kernel and system map
 677 # images. Default is /boot, but you can set it to other values
 678 export  INSTALL_PATH ?= /boot
 679
 680 #
 681 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 682 # relocations required by build roots.  This is not defined in the
 683 # makefile but the argument can be passed to make if needed.
 684 #
 685
 686 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 687 export MODLIB
 688
 689 #
 690 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 691 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 692 #  the default option --strip-debug will be used.  Otherwise,
 693 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 694
 695 ifdef INSTALL_MOD_STRIP
 696 ifeq ($(INSTALL_MOD_STRIP),1)
 697 mod_strip_cmd = $(STRIP) --strip-debug
 698 else
 699 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 700 endif # INSTALL_MOD_STRIP=1
 701 else
 702 mod_strip_cmd = true
 703 endif # INSTALL_MOD_STRIP
 704 export mod_strip_cmd
 705
 706
 707 ifeq ($(KBUILD_EXTMOD),)
 708 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 709
 710 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 711                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 712                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 713
 714 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 715                      $(init-n) $(init-) \
 716                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 717                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 718
 719 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 720 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 721 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 722 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 723 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 724 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 725 libs-y          := $(libs-y1) $(libs-y2)
 726
 727 # Build vmlinux
 728 # ---------------------------------------------------------------------------
 729 # vmlinux is built from the objects selected by $(vmlinux-init) and
 730 # $(vmlinux-main). Most are built-in.o files from top-level directories
 731 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 732 # Ordering when linking is important, and $(vmlinux-init) must be first.
 733 #
 734 # vmlinux
 735 #   ^
 736 #   |
 737 #   +-< $(vmlinux-init)
 738 #   |   +--< init/version.o + more
 739 #   |
 740 #   +--< $(vmlinux-main)
 741 #   |    +--< driver/built-in.o mm/built-in.o + more
 742 #   |
 743 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 744 #
 745 # vmlinux version (uname -v) cannot be updated during normal
 746 # descending-into-subdirs phase since we do not yet know if we need to
 747 # update vmlinux.
 748 # Therefore this step is delayed until just before final link of vmlinux -
 749 # except in the kallsyms case where it is done just before adding the
 750 # symbols to the kernel.
 751 #
 752 # System.map is generated to document addresses of all kernel symbols
 753
 754 vmlinux-init := $(head-y) $(init-y)
 755 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 756 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 757 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 758 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 759
 760 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 761 # May be overridden by arch/$(ARCH)/Makefile
 762 quiet_cmd_vmlinux__ ?= LD      $@
 763       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 764       -T $(vmlinux-lds) $(vmlinux-init)                          \
 765       --start-group $(vmlinux-main) --end-group                  \
 766       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 767
 768 # Generate new vmlinux version
 769 quiet_cmd_vmlinux_version = GEN     .version
 770       cmd_vmlinux_version = set -e;                     \
 771         if [ ! -r .version ]; then                      \
 772           rm -f .version;                               \
 773           echo 1 >.version;                             \
 774         else                                            \
 775           mv .version .old_version;                     \
 776           expr 0$$(cat .old_version) + 1 >.version;     \
 777         fi;                                             \
 778         $(MAKE) $(build)=init
 779
 780 # Generate System.map
 781 quiet_cmd_sysmap = SYSMAP
 782       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 783
 784 # Link of vmlinux
 785 # If CONFIG_KALLSYMS is set .version is already updated
 786 # Generate System.map and verify that the content is consistent
 787 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 788 # First command is ':' to allow us to use + in front of the rule
 789 define rule_vmlinux__
 790         :
 791         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 792
 793         $(call cmd,vmlinux__)
 794         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 795
 796         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 797           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 798         $(cmd_sysmap) $@ System.map;                                         \
 799         if [ $$? -ne 0 ]; then                                               \
 800                 rm -f $@;                                                    \
 801                 /bin/false;                                                  \
 802         fi;
 803         $(verify_kallsyms)
 804 endef
 805
 806
 807 ifdef CONFIG_KALLSYMS
 808 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 809 # It's a three stage process:
 810 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 811 #   empty
 812 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 813 #   the right size - vmlinux version (uname -v) is updated during this step
 814 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 815 #   but due to the added section, some addresses have shifted.
 816 #   From here, we generate a correct .tmp_kallsyms2.o
 817 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 818 # o Verify that the System.map from vmlinux matches the map from
 819 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 820 # o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
 821 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 822 #   temporary bypass to allow the kernel to be built while the
 823 #   maintainers work out what went wrong with kallsyms.
 824
 825 last_kallsyms := 2
 826
 827 ifdef KALLSYMS_EXTRA_PASS
 828 ifneq ($(KALLSYMS_EXTRA_PASS),0)
 829 last_kallsyms := 3
 830 endif
 831 endif
 832
 833 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 834
 835 define verify_kallsyms
 836         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 837           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 838           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 839         $(Q)cmp -s System.map .tmp_System.map ||                             \
 840                 (echo Inconsistent kallsyms data;                            \
 841                  echo This is a bug - please report about it;                \
 842                  echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround;      \
 843                  rm .tmp_kallsyms* ; /bin/false )
 844 endef
 845
 846 # Update vmlinux version before link
 847 # Use + in front of this rule to silent warning about make -j1
 848 # First command is ':' to allow us to use + in front of this rule
 849 cmd_ksym_ld = $(cmd_vmlinux__)
 850 define rule_ksym_ld
 851         :
 852         +$(call cmd,vmlinux_version)
 853         $(call cmd,vmlinux__)
 854         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 855 endef
 856
 857 # Generate .S file with all kernel symbols
 858 quiet_cmd_kallsyms = KSYM    $@
 859       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 860                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 861
 862 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 863         $(call if_changed_dep,as_o_S)
 864
 865 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 866         $(call cmd,kallsyms)
 867
 868 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 869 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 870         $(call if_changed_rule,ksym_ld)
 871
 872 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 873         $(call if_changed,vmlinux__)
 874
 875 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 876         $(call if_changed,vmlinux__)
 877
 878 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 879 $(KALLSYMS): scripts ;
 880
 881 # Generate some data for debugging strange kallsyms problems
 882 debug_kallsyms: .tmp_map$(last_kallsyms)
 883
 884 .tmp_map%: .tmp_vmlinux% FORCE
 885         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 886
 887 .tmp_map3: .tmp_map2
 888
 889 .tmp_map2: .tmp_map1
 890
 891 endif # ifdef CONFIG_KALLSYMS
 892
 893 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 894 # relevant sections renamed as per the linker script.
 895 quiet_cmd_vmlinux-modpost = LD      $@
 896       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 897          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 898          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 899 define rule_vmlinux-modpost
 900         :
 901         +$(call cmd,vmlinux-modpost)
 902         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 903         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 904 endef
 905
 906 # vmlinux image - including updated kernel symbols
 907 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 908 ifdef CONFIG_HEADERS_CHECK
 909         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 910 endif
 911 ifdef CONFIG_SAMPLES
 912         $(Q)$(MAKE) $(build)=samples
 913 endif
 914 ifdef CONFIG_BUILD_DOCSRC
 915         $(Q)$(MAKE) $(build)=Documentation
 916 endif
 917         $(call vmlinux-modpost)
 918         $(call if_changed_rule,vmlinux__)
 919         $(Q)rm -f .old_version
 920
 921 # build vmlinux.o first to catch section mismatch errors early
 922 ifdef CONFIG_KALLSYMS
 923 .tmp_vmlinux1: vmlinux.o
 924 endif
 925
 926 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 927 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 928         $(call if_changed_rule,vmlinux-modpost)
 929
 930 # The actual objects are generated when descending,
 931 # make sure no implicit rule kicks in
 932 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 933
 934 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 935 # Preset locale variables to speed up the build process. Limit locale
 936 # tweaks to this spot to avoid wrong language settings when running
 937 # make menuconfig etc.
 938 # Error messages still appears in the original language
 939
 940 PHONY += $(vmlinux-dirs)
 941 $(vmlinux-dirs): prepare scripts
 942         $(Q)$(MAKE) $(build)=$@
 943
 944 # Store (new) KERNELRELASE string in include/config/kernel.release
 945 include/config/kernel.release: include/config/auto.conf FORCE
 946         $(Q)rm -f $@
 947         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 948
 949
 950 # Things we need to do before we recursively start building the kernel
 951 # or the modules are listed in "prepare".
 952 # A multi level approach is used. prepareN is processed before prepareN-1.
 953 # archprepare is used in arch Makefiles and when processed asm symlink,
 954 # version.h and scripts_basic is processed / created.
 955
 956 # Listed in dependency order
 957 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 958
 959 # prepare3 is used to check if we are building in a separate output directory,
 960 # and if so do:
 961 # 1) Check that make has not been executed in the kernel src $(srctree)
 962 prepare3: include/config/kernel.release
 963 ifneq ($(KBUILD_SRC),)
 964         @$(kecho) '  Using $(srctree) as source for kernel'
 965         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 966                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 967                 echo "  in the '$(srctree)' directory.";\
 968                 /bin/false; \
 969         fi;
 970 endif
 971
 972 # prepare2 creates a makefile if using a separate output directory
 973 prepare2: prepare3 outputmakefile asm-generic
 974
 975 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 976                    include/config/auto.conf
 977         $(cmd_crmodverdir)
 978
 979 archprepare: prepare1 scripts_basic
 980
 981 prepare0: archprepare FORCE
 982         $(Q)$(MAKE) $(build)=.
 983         $(Q)$(MAKE) $(build)=. missing-syscalls
 984
 985 # All the preparing..
 986 prepare: prepare0
 987
 988 # Generate some files
 989 # ---------------------------------------------------------------------------
 990
 991 # KERNELRELEASE can change from a few different places, meaning version.h
 992 # needs to be updated, so this check is forced on all builds
 993
 994 uts_len := 64
 995 define filechk_utsrelease.h
 996         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 997           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 998           exit 1;                                                         \
 999         fi;                                                               \
1000         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1001 endef
1002
1003 define filechk_version.h
1004         (echo \#define LINUX_VERSION_CODE $(shell                             \
1005         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1006         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1007 endef
1008
1009 include/linux/version.h: $(srctree)/Makefile FORCE
1010         $(call filechk,version.h)
1011
1012 include/generated/utsrelease.h: include/config/kernel.release FORCE
1013         $(call filechk,utsrelease.h)
1014
1015 PHONY += headerdep
1016 headerdep:
1017         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1018         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1019
1020 # ---------------------------------------------------------------------------
1021
1022 PHONY += depend dep
1023 depend dep:
1024         @echo '*** Warning: make $@ is unnecessary now.'
1025
1026 # ---------------------------------------------------------------------------
1027 # Firmware install
1028 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1029 export INSTALL_FW_PATH
1030
1031 PHONY += firmware_install
1032 firmware_install: FORCE
1033         @mkdir -p $(objtree)/firmware
1034         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1035
1036 # ---------------------------------------------------------------------------
1037 # Kernel headers
1038
1039 #Default location for installed headers
1040 export INSTALL_HDR_PATH = $(objtree)/usr
1041
1042 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1043
1044 # If we do an all arch process set dst to asm-$(hdr-arch)
1045 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1046
1047 PHONY += __headers
1048 __headers: include/linux/version.h scripts_basic asm-generic FORCE
1049         $(Q)$(MAKE) $(build)=scripts build_unifdef
1050
1051 PHONY += headers_install_all
1052 headers_install_all:
1053         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1054
1055 PHONY += headers_install
1056 headers_install: __headers
1057         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1058         $(error Headers not exportable for the $(SRCARCH) architecture))
1059         $(Q)$(MAKE) $(hdr-inst)=include
1060         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1061
1062 PHONY += headers_check_all
1063 headers_check_all: headers_install_all
1064         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1065
1066 PHONY += headers_check
1067 headers_check: headers_install
1068         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1069         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1070
1071 # ---------------------------------------------------------------------------
1072 # Modules
1073
1074 ifdef CONFIG_MODULES
1075
1076 # By default, build modules as well
1077
1078 all: modules
1079
1080 #       Build modules
1081 #
1082 #       A module can be listed more than once in obj-m resulting in
1083 #       duplicate lines in modules.order files.  Those are removed
1084 #       using awk while concatenating to the final file.
1085
1086 PHONY += modules
1087 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1088         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1089         @$(kecho) '  Building modules, stage 2.';
1090         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1091         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1092
1093 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1094         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1095
1096 %/modules.builtin: include/config/auto.conf
1097         $(Q)$(MAKE) $(modbuiltin)=$*
1098
1099
1100 # Target to prepare building external modules
1101 PHONY += modules_prepare
1102 modules_prepare: prepare scripts
1103
1104 # Target to install modules
1105 PHONY += modules_install
1106 modules_install: _modinst_ _modinst_post
1107
1108 PHONY += _modinst_
1109 _modinst_:
1110         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1111                 echo "Warning: you may need to install module-init-tools"; \
1112                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1113                 sleep 1; \
1114         fi
1115         @rm -rf $(MODLIB)/kernel
1116         @rm -f $(MODLIB)/source
1117         @mkdir -p $(MODLIB)/kernel
1118         @ln -s $(srctree) $(MODLIB)/source
1119         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1120                 rm -f $(MODLIB)/build ; \
1121                 ln -s $(objtree) $(MODLIB)/build ; \
1122         fi
1123         @cp -f $(objtree)/modules.order $(MODLIB)/
1124         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1125         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1126
1127 # This depmod is only for convenience to give the initial
1128 # boot a modules.dep even before / is mounted read-write.  However the
1129 # boot script depmod is the master version.
1130 PHONY += _modinst_post
1131 _modinst_post: _modinst_
1132         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1133         $(call cmd,depmod)
1134
1135 else # CONFIG_MODULES
1136
1137 # Modules not configured
1138 # ---------------------------------------------------------------------------
1139
1140 modules modules_install: FORCE
1141         @echo
1142         @echo "The present kernel configuration has modules disabled."
1143         @echo "Type 'make config' and enable loadable module support."
1144         @echo "Then build a kernel with module support enabled."
1145         @echo
1146         @exit 1
1147
1148 endif # CONFIG_MODULES
1149
1150 ###
1151 # Cleaning is done on three levels.
1152 # make clean     Delete most generated files
1153 #                Leave enough to build external modules
1154 # make mrproper  Delete the current configuration, and all generated files
1155 # make distclean Remove editor backup files, patch leftover files and the like
1156
1157 # Directories & files removed with 'make clean'
1158 CLEAN_DIRS  += $(MODVERDIR)
1159 CLEAN_FILES +=  vmlinux System.map \
1160                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1161
1162 # Directories & files removed with 'make mrproper'
1163 MRPROPER_DIRS  += include/config usr/include include/generated          \
1164                   arch/*/include/generated
1165 MRPROPER_FILES += .config .config.old .version .old_version             \
1166                   include/linux/version.h                               \
1167                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1168
1169 # clean - Delete most, but leave enough to build external modules
1170 #
1171 clean: rm-dirs  := $(CLEAN_DIRS)
1172 clean: rm-files := $(CLEAN_FILES)
1173 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1174
1175 PHONY += $(clean-dirs) clean archclean
1176 $(clean-dirs):
1177         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1178
1179 clean: archclean
1180
1181 # mrproper - Delete all generated files, including .config
1182 #
1183 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1184 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1185 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1186
1187 PHONY += $(mrproper-dirs) mrproper archmrproper
1188 $(mrproper-dirs):
1189         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1190
1191 mrproper: clean archmrproper $(mrproper-dirs)
1192         $(call cmd,rmdirs)
1193         $(call cmd,rmfiles)
1194
1195 # distclean
1196 #
1197 PHONY += distclean
1198
1199 distclean: mrproper
1200         @find $(srctree) $(RCS_FIND_IGNORE) \
1201                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1202                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1203                 -o -name '.*.rej' -o -size 0 \
1204                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1205                 -type f -print | xargs rm -f
1206
1207
1208 # Packaging of the kernel to various formats
1209 # ---------------------------------------------------------------------------
1210 # rpm target kept for backward compatibility
1211 package-dir     := $(srctree)/scripts/package
1212
1213 %src-pkg: FORCE
1214         $(Q)$(MAKE) $(build)=$(package-dir) $@
1215 %pkg: include/config/kernel.release FORCE
1216         $(Q)$(MAKE) $(build)=$(package-dir) $@
1217 rpm: include/config/kernel.release FORCE
1218         $(Q)$(MAKE) $(build)=$(package-dir) $@
1219
1220
1221 # Brief documentation of the typical targets used
1222 # ---------------------------------------------------------------------------
1223
1224 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1225 boards := $(notdir $(boards))
1226 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1227 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1228
1229 help:
1230         @echo  'Cleaning targets:'
1231         @echo  '  clean           - Remove most generated files but keep the config and'
1232         @echo  '                    enough build support to build external modules'
1233         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1234         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1235         @echo  ''
1236         @echo  'Configuration targets:'
1237         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1238         @echo  ''
1239         @echo  'Other generic targets:'
1240         @echo  '  all             - Build all targets marked with [*]'
1241         @echo  '* vmlinux         - Build the bare kernel'
1242         @echo  '* modules         - Build all modules'
1243         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1244         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1245         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1246         @echo  '  dir/            - Build all files in dir and below'
1247         @echo  '  dir/file.[oisS] - Build specified target only'
1248         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1249         @echo  '                    (requires a recent binutils and recent build (System.map))'
1250         @echo  '  dir/file.ko     - Build module including final link'
1251         @echo  '  modules_prepare - Set up for building external modules'
1252         @echo  '  tags/TAGS       - Generate tags file for editors'
1253         @echo  '  cscope          - Generate cscope index'
1254         @echo  '  gtags           - Generate GNU GLOBAL index'
1255         @echo  '  kernelrelease   - Output the release version string'
1256         @echo  '  kernelversion   - Output the version stored in Makefile'
1257         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1258          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1259          echo  ''
1260         @echo  'Static analysers'
1261         @echo  '  checkstack      - Generate a list of stack hogs'
1262         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1263         @echo  '  versioncheck    - Sanity check on version.h usage'
1264         @echo  '  includecheck    - Check for duplicate included header files'
1265         @echo  '  export_report   - List the usages of all exported symbols'
1266         @echo  '  headers_check   - Sanity check on exported headers'
1267         @echo  '  headerdep       - Detect inclusion cycles in headers'
1268         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1269         @echo  ''
1270         @echo  'Kernel packaging:'
1271         @$(MAKE) $(build)=$(package-dir) help
1272         @echo  ''
1273         @echo  'Documentation targets:'
1274         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1275         @echo  ''
1276         @echo  'Architecture specific targets ($(SRCARCH)):'
1277         @$(if $(archhelp),$(archhelp),\
1278                 echo '  No architecture specific help defined for $(SRCARCH)')
1279         @echo  ''
1280         @$(if $(boards), \
1281                 $(foreach b, $(boards), \
1282                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1283                 echo '')
1284         @$(if $(board-dirs), \
1285                 $(foreach b, $(board-dirs), \
1286                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1287                 printf "  %-16s - Show all of the above\\n" help-boards; \
1288                 echo '')
1289
1290         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1291         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1292         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1293         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1294         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1295         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1296         @echo  '                1: warnings which may be relevant and do not occur too often'
1297         @echo  '                2: warnings which occur quite often but may still be relevant'
1298         @echo  '                3: more obscure warnings, can most likely be ignored'
1299         @echo  '                Multiple levels can be combined with W=12 or W=123'
1300         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1301         @echo  ''
1302         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1303         @echo  'For further info see the ./README file'
1304
1305
1306 help-board-dirs := $(addprefix help-,$(board-dirs))
1307
1308 help-boards: $(help-board-dirs)
1309
1310 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1311
1312 $(help-board-dirs): help-%:
1313         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1314         @$(if $(boards-per-dir), \
1315                 $(foreach b, $(boards-per-dir), \
1316                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1317                 echo '')
1318
1319
1320 # Documentation targets
1321 # ---------------------------------------------------------------------------
1322 %docs: scripts_basic FORCE
1323         $(Q)$(MAKE) $(build)=scripts build_docproc
1324         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1325
1326 else # KBUILD_EXTMOD
1327
1328 ###
1329 # External module support.
1330 # When building external modules the kernel used as basis is considered
1331 # read-only, and no consistency checks are made and the make
1332 # system is not used on the basis kernel. If updates are required
1333 # in the basis kernel ordinary make commands (without M=...) must
1334 # be used.
1335 #
1336 # The following are the only valid targets when building external
1337 # modules.
1338 # make M=dir clean     Delete all automatically generated files
1339 # make M=dir modules   Make all modules in specified dir
1340 # make M=dir           Same as 'make M=dir modules'
1341 # make M=dir modules_install
1342 #                      Install the modules built in the module directory
1343 #                      Assumes install directory is already created
1344
1345 # We are always building modules
1346 KBUILD_MODULES := 1
1347 PHONY += crmodverdir
1348 crmodverdir:
1349         $(cmd_crmodverdir)
1350
1351 PHONY += $(objtree)/Module.symvers
1352 $(objtree)/Module.symvers:
1353         @test -e $(objtree)/Module.symvers || ( \
1354         echo; \
1355         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1356         echo "           is missing; modules will have no dependencies and modversions."; \
1357         echo )
1358
1359 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1360 PHONY += $(module-dirs) modules
1361 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1362         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1363
1364 modules: $(module-dirs)
1365         @$(kecho) '  Building modules, stage 2.';
1366         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1367
1368 PHONY += modules_install
1369 modules_install: _emodinst_ _emodinst_post
1370
1371 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1372 PHONY += _emodinst_
1373 _emodinst_:
1374         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1375         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1376
1377 PHONY += _emodinst_post
1378 _emodinst_post: _emodinst_
1379         $(call cmd,depmod)
1380
1381 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1382
1383 PHONY += $(clean-dirs) clean
1384 $(clean-dirs):
1385         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1386
1387 clean:  rm-dirs := $(MODVERDIR)
1388 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1389
1390 help:
1391         @echo  '  Building external modules.'
1392         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1393         @echo  ''
1394         @echo  '  modules         - default target, build the module(s)'
1395         @echo  '  modules_install - install the module'
1396         @echo  '  clean           - remove generated files in module directory only'
1397         @echo  ''
1398
1399 # Dummies...
1400 PHONY += prepare scripts
1401 prepare: ;
1402 scripts: ;
1403 endif # KBUILD_EXTMOD
1404
1405 clean: $(clean-dirs)
1406         $(call cmd,rmdirs)
1407         $(call cmd,rmfiles)
1408         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1409                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1410                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1411                 -o -name '*.symtypes' -o -name 'modules.order' \
1412                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1413                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1414
1415 # Generate tags for editors
1416 # ---------------------------------------------------------------------------
1417 quiet_cmd_tags = GEN     $@
1418       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1419
1420 tags TAGS cscope gtags: FORCE
1421         $(call cmd,tags)
1422
1423 # Scripts to check various things for consistency
1424 # ---------------------------------------------------------------------------
1425
1426 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1427
1428 includecheck:
1429         find $(srctree)/* $(RCS_FIND_IGNORE) \
1430                 -name '*.[hcS]' -type f -print | sort \
1431                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1432
1433 versioncheck:
1434         find $(srctree)/* $(RCS_FIND_IGNORE) \
1435                 -name '*.[hcS]' -type f -print | sort \
1436                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1437
1438 coccicheck:
1439         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1440
1441 namespacecheck:
1442         $(PERL) $(srctree)/scripts/namespace.pl
1443
1444 export_report:
1445         $(PERL) $(srctree)/scripts/export_report.pl
1446
1447 endif #ifeq ($(config-targets),1)
1448 endif #ifeq ($(mixed-targets),1)
1449
1450 PHONY += checkstack kernelrelease kernelversion
1451
1452 # UML needs a little special treatment here.  It wants to use the host
1453 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1454 # else wants $(ARCH), including people doing cross-builds, which means
1455 # that $(SUBARCH) doesn't work here.
1456 ifeq ($(ARCH), um)
1457 CHECKSTACK_ARCH := $(SUBARCH)
1458 else
1459 CHECKSTACK_ARCH := $(ARCH)
1460 endif
1461 checkstack:
1462         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1463         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1464
1465 kernelrelease:
1466         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1467
1468 kernelversion:
1469         @echo $(KERNELVERSION)
1470
1471 # Single targets
1472 # ---------------------------------------------------------------------------
1473 # Single targets are compatible with:
1474 # - build with mixed source and output
1475 # - build with separate output dir 'make O=...'
1476 # - external modules
1477 #
1478 #  target-dir => where to store outputfile
1479 #  build-dir  => directory in kernel source tree to use
1480
1481 ifeq ($(KBUILD_EXTMOD),)
1482         build-dir  = $(patsubst %/,%,$(dir $@))
1483         target-dir = $(dir $@)
1484 else
1485         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1486         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1487         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1488 endif
1489
1490 %.s: %.c prepare scripts FORCE
1491         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1492 %.i: %.c prepare scripts FORCE
1493         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1494 %.o: %.c prepare scripts FORCE
1495         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1496 %.lst: %.c prepare scripts FORCE
1497         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1498 %.s: %.S prepare scripts FORCE
1499         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1500 %.o: %.S prepare scripts FORCE
1501         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1502 %.symtypes: %.c prepare scripts FORCE
1503         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1504
1505 # Modules
1506 /: prepare scripts FORCE
1507         $(cmd_crmodverdir)
1508         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1509         $(build)=$(build-dir)
1510 %/: prepare scripts FORCE
1511         $(cmd_crmodverdir)
1512         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1513         $(build)=$(build-dir)
1514 %.ko: prepare scripts FORCE
1515         $(cmd_crmodverdir)
1516         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1517         $(build)=$(build-dir) $(@:.ko=.o)
1518         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1519
1520 # FIXME Should go into a make.lib or something
1521 # ===========================================================================
1522
1523 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1524       cmd_rmdirs = rm -rf $(rm-dirs)
1525
1526 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1527       cmd_rmfiles = rm -f $(rm-files)
1528
1529 # Run depmod only if we have System.map and depmod is executable
1530 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1531       cmd_depmod = \
1532         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1533                 $(DEPMOD) -ae -F System.map                                     \
1534                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1535                 $(KERNELRELEASE);                                               \
1536         fi
1537
1538 # Create temporary dir for module support files
1539 # clean it up only when building all modules
1540 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1541                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1542
1543 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1544           $(KBUILD_AFLAGS_KERNEL)                              \
1545           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1546           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1547
1548 quiet_cmd_as_o_S = AS      $@
1549 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1550
1551 # read all saved command lines
1552
1553 targets := $(wildcard $(sort $(targets)))
1554 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1555
1556 ifneq ($(cmd_files),)
1557   $(cmd_files): ;       # Do not try to update included dependency files
1558   include $(cmd_files)
1559 endif
1560
1561 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1562 # Usage:
1563 # $(Q)$(MAKE) $(clean)=dir
1564 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1565
1566 endif   # skip-makefile
1567
1568 PHONY += FORCE
1569 FORCE:
1570
1571 # Declare the contents of the .PHONY variable as phony.  We keep that
1572 # information in a variable so we can use it in if_changed and friends.
1573 .PHONY: $(PHONY)