Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 29
   4 EXTRAVERSION = -rc1
   5 NAME = Erotic Pickled Herring
   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 ($(ARCH),x86_64)
 210         SRCARCH := x86
 211 endif
 212
 213 # Additional ARCH settings for sparc
 214 ifeq ($(ARCH),sparc64)
 215        SRCARCH := sparc
 216 endif
 217
 218 # Where to locate arch specific headers
 219 hdr-arch  := $(SRCARCH)
 220
 221 KCONFIG_CONFIG  ?= .config
 222
 223 # SHELL used by kbuild
 224 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 225           else if [ -x /bin/bash ]; then echo /bin/bash; \
 226           else echo sh; fi ; fi)
 227
 228 HOSTCC       = gcc
 229 HOSTCXX      = g++
 230 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 231 HOSTCXXFLAGS = -O2
 232
 233 # Decide whether to build built-in, modular, or both.
 234 # Normally, just do built-in.
 235
 236 KBUILD_MODULES :=
 237 KBUILD_BUILTIN := 1
 238
 239 #       If we have only "make modules", don't compile built-in objects.
 240 #       When we're building modules with modversions, we need to consider
 241 #       the built-in objects during the descend as well, in order to
 242 #       make sure the checksums are up to date before we record them.
 243
 244 ifeq ($(MAKECMDGOALS),modules)
 245   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 246 endif
 247
 248 #       If we have "make <whatever> modules", compile modules
 249 #       in addition to whatever we do anyway.
 250 #       Just "make" or "make all" shall build modules as well
 251
 252 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 253   KBUILD_MODULES := 1
 254 endif
 255
 256 ifeq ($(MAKECMDGOALS),)
 257   KBUILD_MODULES := 1
 258 endif
 259
 260 export KBUILD_MODULES KBUILD_BUILTIN
 261 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 262
 263 # Beautify output
 264 # ---------------------------------------------------------------------------
 265 #
 266 # Normally, we echo the whole command before executing it. By making
 267 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 268 # $(quiet) to choose other forms of output instead, e.g.
 269 #
 270 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 271 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 272 #
 273 # If $(quiet) is empty, the whole command will be printed.
 274 # If it is set to "quiet_", only the short version will be printed.
 275 # If it is set to "silent_", nothing will be printed at all, since
 276 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 277 #
 278 # A simple variant is to prefix commands with $(Q) - that's useful
 279 # for commands that shall be hidden in non-verbose mode.
 280 #
 281 #       $(Q)ln $@ :<
 282 #
 283 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 284 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 285
 286 ifeq ($(KBUILD_VERBOSE),1)
 287   quiet =
 288   Q =
 289 else
 290   quiet=quiet_
 291   Q = @
 292 endif
 293
 294 # If the user is running make -s (silent mode), suppress echoing of
 295 # commands
 296
 297 ifneq ($(findstring s,$(MAKEFLAGS)),)
 298   quiet=silent_
 299 endif
 300
 301 export quiet Q KBUILD_VERBOSE
 302
 303
 304 # Look for make include files relative to root of kernel src
 305 MAKEFLAGS += --include-dir=$(srctree)
 306
 307 # We need some generic definitions (do not try to remake the file).
 308 $(srctree)/scripts/Kbuild.include: ;
 309 include $(srctree)/scripts/Kbuild.include
 310
 311 # Make variables (CC, etc...)
 312
 313 AS              = $(CROSS_COMPILE)as
 314 LD              = $(CROSS_COMPILE)ld
 315 CC              = $(CROSS_COMPILE)gcc
 316 CPP             = $(CC) -E
 317 AR              = $(CROSS_COMPILE)ar
 318 NM              = $(CROSS_COMPILE)nm
 319 STRIP           = $(CROSS_COMPILE)strip
 320 OBJCOPY         = $(CROSS_COMPILE)objcopy
 321 OBJDUMP         = $(CROSS_COMPILE)objdump
 322 AWK             = awk
 323 GENKSYMS        = scripts/genksyms/genksyms
 324 DEPMOD          = /sbin/depmod
 325 KALLSYMS        = scripts/kallsyms
 326 PERL            = perl
 327 CHECK           = sparse
 328
 329 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 330                   -Wbitwise -Wno-return-void $(CF)
 331 MODFLAGS        = -DMODULE
 332 CFLAGS_MODULE   = $(MODFLAGS)
 333 AFLAGS_MODULE   = $(MODFLAGS)
 334 LDFLAGS_MODULE  =
 335 CFLAGS_KERNEL   =
 336 AFLAGS_KERNEL   =
 337
 338
 339 # Use LINUXINCLUDE when you must reference the include/ directory.
 340 # Needed to be compatible with the O= option
 341 LINUXINCLUDE    := -Iinclude \
 342                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 343                    -I$(srctree)/arch/$(hdr-arch)/include               \
 344                    -include include/linux/autoconf.h
 345
 346 KBUILD_CPPFLAGS := -D__KERNEL__
 347
 348 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 349                    -fno-strict-aliasing -fno-common \
 350                    -Werror-implicit-function-declaration
 351 KBUILD_AFLAGS   := -D__ASSEMBLY__
 352
 353 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 354 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 355 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 356
 357 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 358 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 359 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 360 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 361
 362 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 363 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 364 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 365
 366 # When compiling out-of-tree modules, put MODVERDIR in the module
 367 # tree rather than in the kernel tree. The kernel tree might
 368 # even be read-only.
 369 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 370
 371 # Files to ignore in find ... statements
 372
 373 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
 374 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 375
 376 # ===========================================================================
 377 # Rules shared between *config targets and build targets
 378
 379 # Basic helpers built in scripts/
 380 PHONY += scripts_basic
 381 scripts_basic:
 382         $(Q)$(MAKE) $(build)=scripts/basic
 383
 384 # To avoid any implicit rule to kick in, define an empty command.
 385 scripts/basic/%: scripts_basic ;
 386
 387 PHONY += outputmakefile
 388 # outputmakefile generates a Makefile in the output directory, if using a
 389 # separate output directory. This allows convenient use of make in the
 390 # output directory.
 391 outputmakefile:
 392 ifneq ($(KBUILD_SRC),)
 393         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 394             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 395 endif
 396
 397 # To make sure we do not include .config for any of the *config targets
 398 # catch them early, and hand them over to scripts/kconfig/Makefile
 399 # It is allowed to specify more targets when calling make, including
 400 # mixing *config targets and build targets.
 401 # For example 'make oldconfig all'.
 402 # Detect when mixed targets is specified, and make a second invocation
 403 # of make so .config is not included in this case either (for *config).
 404
 405 no-dot-config-targets := clean mrproper distclean \
 406                          cscope TAGS tags help %docs check% \
 407                          include/linux/version.h headers_% \
 408                          kernelrelease kernelversion
 409
 410 config-targets := 0
 411 mixed-targets  := 0
 412 dot-config     := 1
 413
 414 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 415         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 416                 dot-config := 0
 417         endif
 418 endif
 419
 420 ifeq ($(KBUILD_EXTMOD),)
 421         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 422                 config-targets := 1
 423                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 424                         mixed-targets := 1
 425                 endif
 426         endif
 427 endif
 428
 429 ifeq ($(mixed-targets),1)
 430 # ===========================================================================
 431 # We're called with mixed targets (*config and build targets).
 432 # Handle them one by one.
 433
 434 %:: FORCE
 435         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 436
 437 else
 438 ifeq ($(config-targets),1)
 439 # ===========================================================================
 440 # *config targets only - make sure prerequisites are updated, and descend
 441 # in scripts/kconfig to make the *config target
 442
 443 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 444 # KBUILD_DEFCONFIG may point out an alternative default configuration
 445 # used for 'make defconfig'
 446 include $(srctree)/arch/$(SRCARCH)/Makefile
 447 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 448
 449 config: scripts_basic outputmakefile FORCE
 450         $(Q)mkdir -p include/linux include/config
 451         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 452
 453 %config: scripts_basic outputmakefile FORCE
 454         $(Q)mkdir -p include/linux include/config
 455         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 456
 457 else
 458 # ===========================================================================
 459 # Build targets only - this includes vmlinux, arch specific targets, clean
 460 # targets and others. In general all targets except *config targets.
 461
 462 ifeq ($(KBUILD_EXTMOD),)
 463 # Additional helpers built in scripts/
 464 # Carefully list dependencies so we do not try to build scripts twice
 465 # in parallel
 466 PHONY += scripts
 467 scripts: scripts_basic include/config/auto.conf
 468         $(Q)$(MAKE) $(build)=$(@)
 469
 470 # Objects we will link into vmlinux / subdirs we need to visit
 471 init-y          := init/
 472 drivers-y       := drivers/ sound/ firmware/
 473 net-y           := net/
 474 libs-y          := lib/
 475 core-y          := usr/
 476 endif # KBUILD_EXTMOD
 477
 478 ifeq ($(dot-config),1)
 479 # Read in config
 480 -include include/config/auto.conf
 481
 482 ifeq ($(KBUILD_EXTMOD),)
 483 # Read in dependencies to all Kconfig* files, make sure to run
 484 # oldconfig if changes are detected.
 485 -include include/config/auto.conf.cmd
 486
 487 # To avoid any implicit rule to kick in, define an empty command
 488 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 489
 490 # If .config is newer than include/config/auto.conf, someone tinkered
 491 # with it and forgot to run make oldconfig.
 492 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 493 # we execute the config step to be sure to catch updated Kconfig files
 494 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 495         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 496 else
 497 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 498 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 499 PHONY += include/config/auto.conf
 500
 501 include/config/auto.conf:
 502         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 503         echo;                                                           \
 504         echo "  ERROR: Kernel configuration is invalid.";               \
 505         echo "         include/linux/autoconf.h or $@ are missing.";    \
 506         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 507         echo;                                                           \
 508         /bin/false)
 509
 510 endif # KBUILD_EXTMOD
 511
 512 else
 513 # Dummy target needed, because used as prerequisite
 514 include/config/auto.conf: ;
 515 endif # $(dot-config)
 516
 517 # The all: target is the default when no target is given on the
 518 # command line.
 519 # This allow a user to issue only 'make' to build a kernel including modules
 520 # Defaults vmlinux but it is usually overridden in the arch makefile
 521 all: vmlinux
 522
 523 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 524 KBUILD_CFLAGS   += -Os
 525 else
 526 KBUILD_CFLAGS   += -O2
 527 endif
 528
 529 include $(srctree)/arch/$(SRCARCH)/Makefile
 530
 531 ifneq (CONFIG_FRAME_WARN,0)
 532 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 533 endif
 534
 535 # Force gcc to behave correct even for buggy distributions
 536 # Arch Makefiles may override this setting
 537 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 538
 539 ifdef CONFIG_FRAME_POINTER
 540 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 541 else
 542 KBUILD_CFLAGS   += -fomit-frame-pointer
 543 endif
 544
 545 ifdef CONFIG_DEBUG_INFO
 546 KBUILD_CFLAGS   += -g
 547 KBUILD_AFLAGS   += -gdwarf-2
 548 endif
 549
 550 ifdef CONFIG_FUNCTION_TRACER
 551 KBUILD_CFLAGS   += -pg
 552 endif
 553
 554 # We trigger additional mismatches with less inlining
 555 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 556 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 557 endif
 558
 559 # arch Makefile may override CC so keep this after arch Makefile is included
 560 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 561 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 562
 563 # warn about C99 declaration after statement
 564 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 565
 566 # disable pointer signed / unsigned warnings in gcc 4.0
 567 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 568
 569 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 570 # But warn user when we do so
 571 warn-assign = \
 572 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 573
 574 ifneq ($(KCPPFLAGS),)
 575         $(call warn-assign,CPPFLAGS)
 576         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 577 endif
 578 ifneq ($(KAFLAGS),)
 579         $(call warn-assign,AFLAGS)
 580         KBUILD_AFLAGS += $(KAFLAGS)
 581 endif
 582 ifneq ($(KCFLAGS),)
 583         $(call warn-assign,CFLAGS)
 584         KBUILD_CFLAGS += $(KCFLAGS)
 585 endif
 586
 587 # Use --build-id when available.
 588 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 589                               $(call ld-option, -Wl$(comma)--build-id,))
 590 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 591 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 592
 593 # Default kernel image to build when no specific target is given.
 594 # KBUILD_IMAGE may be overruled on the command line or
 595 # set in the environment
 596 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 597 # this default value
 598 export KBUILD_IMAGE ?= vmlinux
 599
 600 #
 601 # INSTALL_PATH specifies where to place the updated kernel and system map
 602 # images. Default is /boot, but you can set it to other values
 603 export  INSTALL_PATH ?= /boot
 604
 605 #
 606 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 607 # relocations required by build roots.  This is not defined in the
 608 # makefile but the argument can be passed to make if needed.
 609 #
 610
 611 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 612 export MODLIB
 613
 614 strip-symbols := $(srctree)/scripts/strip-symbols \
 615                  $(wildcard $(srctree)/arch/$(ARCH)/scripts/strip-symbols)
 616
 617 #
 618 # INSTALL_MOD_STRIP, if defined, will cause modules to be stripped while
 619 # they get installed.  If INSTALL_MOD_STRIP is '1', then the default
 620 # options (see below) will be used.  Otherwise, INSTALL_MOD_STRIP will
 621 # be used as the option(s) to the objcopy command.
 622 ifdef INSTALL_MOD_STRIP
 623 ifeq ($(INSTALL_MOD_STRIP),1)
 624 mod_strip_cmd = $(OBJCOPY) --strip-debug
 625 ifeq ($(CONFIG_KALLSYMS_ALL),$(CONFIG_KALLSYMS_STRIP_GENERATED))
 626 mod_strip_cmd += --wildcard $(addprefix --strip-symbols ,$(strip-symbols))
 627 endif
 628 else
 629 mod_strip_cmd = $(OBJCOPY) $(INSTALL_MOD_STRIP)
 630 endif # INSTALL_MOD_STRIP=1
 631 else
 632 mod_strip_cmd = false
 633 endif # INSTALL_MOD_STRIP
 634 export mod_strip_cmd
 635
 636
 637 ifeq ($(KBUILD_EXTMOD),)
 638 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 639
 640 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 641                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 642                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 643
 644 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 645                      $(init-n) $(init-) \
 646                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 647                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 648
 649 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 650 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 651 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 652 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 653 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 654 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 655 libs-y          := $(libs-y1) $(libs-y2)
 656
 657 # Build vmlinux
 658 # ---------------------------------------------------------------------------
 659 # vmlinux is built from the objects selected by $(vmlinux-init) and
 660 # $(vmlinux-main). Most are built-in.o files from top-level directories
 661 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 662 # Ordering when linking is important, and $(vmlinux-init) must be first.
 663 #
 664 # vmlinux
 665 #   ^
 666 #   |
 667 #   +-< $(vmlinux-init)
 668 #   |   +--< init/version.o + more
 669 #   |
 670 #   +--< $(vmlinux-main)
 671 #   |    +--< driver/built-in.o mm/built-in.o + more
 672 #   |
 673 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 674 #
 675 # vmlinux version (uname -v) cannot be updated during normal
 676 # descending-into-subdirs phase since we do not yet know if we need to
 677 # update vmlinux.
 678 # Therefore this step is delayed until just before final link of vmlinux -
 679 # except in the kallsyms case where it is done just before adding the
 680 # symbols to the kernel.
 681 #
 682 # System.map is generated to document addresses of all kernel symbols
 683
 684 vmlinux-init := $(head-y) $(init-y)
 685 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 686 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 687 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 688 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 689
 690 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 691 # May be overridden by arch/$(ARCH)/Makefile
 692 quiet_cmd_vmlinux__ ?= LD      $@
 693       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 694       -T $(vmlinux-lds) $(vmlinux-init)                          \
 695       --start-group $(vmlinux-main) --end-group                  \
 696       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 697
 698 # Generate new vmlinux version
 699 quiet_cmd_vmlinux_version = GEN     .version
 700       cmd_vmlinux_version = set -e;                     \
 701         if [ ! -r .version ]; then                      \
 702           rm -f .version;                               \
 703           echo 1 >.version;                             \
 704         else                                            \
 705           mv .version .old_version;                     \
 706           expr 0$$(cat .old_version) + 1 >.version;     \
 707         fi;                                             \
 708         $(MAKE) $(build)=init
 709
 710 # Generate System.map
 711 quiet_cmd_sysmap = SYSMAP
 712       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 713
 714 # Link of vmlinux
 715 # If CONFIG_KALLSYMS is set .version is already updated
 716 # Generate System.map and verify that the content is consistent
 717 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 718 # First command is ':' to allow us to use + in front of the rule
 719 define rule_vmlinux__
 720         :
 721         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 722
 723         $(call cmd,vmlinux__)
 724         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 725
 726         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 727           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 728         $(cmd_sysmap) $@ System.map;                                         \
 729         if [ $$? -ne 0 ]; then                                               \
 730                 rm -f $@;                                                    \
 731                 /bin/false;                                                  \
 732         fi;
 733         $(verify_kallsyms)
 734 endef
 735
 736
 737 ifdef CONFIG_KALLSYMS
 738 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 739 # It's a three stage process:
 740 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 741 #   empty
 742 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 743 #   the right size - vmlinux version (uname -v) is updated during this step
 744 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 745 #   but due to the added section, some addresses have shifted.
 746 #   From here, we generate a correct .tmp_kallsyms2.o
 747 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 748 # o Verify that the System.map from vmlinux matches the map from
 749 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 750 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 751 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 752 #   temporary bypass to allow the kernel to be built while the
 753 #   maintainers work out what went wrong with kallsyms.
 754
 755 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 756 last_kallsyms := 3
 757 else
 758 last_kallsyms := 2
 759 endif
 760
 761 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 762 kallsyms.h := $(wildcard include/config/kallsyms/*.h) $(wildcard include/config/kallsyms/*/*.h)
 763
 764 define verify_kallsyms
 765         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 766           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 767           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 768         $(Q)cmp -s System.map .tmp_System.map ||                             \
 769                 (echo Inconsistent kallsyms data;                            \
 770                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 771                  rm .tmp_kallsyms* ; /bin/false )
 772 endef
 773
 774 # Update vmlinux version before link
 775 # Use + in front of this rule to silent warning about make -j1
 776 # First command is ':' to allow us to use + in front of this rule
 777 cmd_ksym_ld = $(cmd_vmlinux__)
 778 define rule_ksym_ld
 779         :
 780         +$(call cmd,vmlinux_version)
 781         $(call cmd,vmlinux__)
 782         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 783 endef
 784
 785 # Generate .S file with all kernel symbols
 786 quiet_cmd_kallsyms = KSYM    $@
 787       cmd_kallsyms = { test $* -eq 0 || $(NM) -n $<; } \
 788                      | $(KALLSYMS) $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) >$@
 789
 790 quiet_cmd_kstrip = STRIP   $@
 791       cmd_kstrip = $(OBJCOPY) --wildcard $(addprefix --strip$(if $(CONFIG_RELOCATABLE),-unneeded)-symbols ,$(filter %/scripts/strip-symbols,$^)) $< $@
 792
 793 $(foreach n,0 1 2 3,.tmp_kallsyms$(n).o): KBUILD_AFLAGS += -Wa,--strip-local-absolute
 794 $(foreach n,0 1 2 3,.tmp_kallsyms$(n).o): %.o: %.S scripts FORCE
 795         $(call if_changed_dep,as_o_S)
 796
 797 ifeq ($(CONFIG_KALLSYMS_STRIP_GENERATED),y)
 798 strip-ext := .stripped
 799 endif
 800
 801 .tmp_kallsyms%.S: .tmp_vmlinux%$(strip-ext) $(KALLSYMS) $(kallsyms.h)
 802         $(call cmd,kallsyms)
 803
 804 # make -jN seems to have problems with intermediate files, see bug #3330.
 805 .SECONDARY: $(foreach n,1 2 3,.tmp_vmlinux$(n).stripped)
 806 .tmp_vmlinux%.stripped: .tmp_vmlinux% $(strip-symbols) $(kallsyms.h)
 807         $(call cmd,kstrip)
 808
 809 ifneq ($(CONFIG_DEBUG_INFO),y)
 810 .tmp_vmlinux%: LDFLAGS_vmlinux += -S
 811 endif
 812 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 813 .tmp_vmlinux%: $(vmlinux-lds) $(vmlinux-all) FORCE
 814         $(if $(filter 1,$*),$(call if_changed_rule,ksym_ld),$(call if_changed,vmlinux__))
 815
 816 .tmp_vmlinux0$(strip-ext):
 817         $(Q)echo "placeholder" >$@
 818
 819 .tmp_vmlinux1: .tmp_kallsyms0.o
 820 .tmp_vmlinux2: .tmp_kallsyms1.o
 821 .tmp_vmlinux3: .tmp_kallsyms2.o
 822
 823 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 824 $(KALLSYMS): scripts ;
 825
 826 # Generate some data for debugging strange kallsyms problems
 827 debug_kallsyms: .tmp_map$(last_kallsyms)
 828
 829 .tmp_map%: .tmp_vmlinux% FORCE
 830         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 831
 832 .tmp_map3: .tmp_map2
 833
 834 .tmp_map2: .tmp_map1
 835
 836 endif # ifdef CONFIG_KALLSYMS
 837
 838 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 839 # relevant sections renamed as per the linker script.
 840 quiet_cmd_vmlinux-modpost = LD      $@
 841       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 842          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 843          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 844 define rule_vmlinux-modpost
 845         :
 846         +$(call cmd,vmlinux-modpost)
 847         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 848         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 849 endef
 850
 851 # vmlinux image - including updated kernel symbols
 852 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 853 ifdef CONFIG_HEADERS_CHECK
 854         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 855 endif
 856 ifdef CONFIG_SAMPLES
 857         $(Q)$(MAKE) $(build)=samples
 858 endif
 859 ifdef CONFIG_BUILD_DOCSRC
 860         $(Q)$(MAKE) $(build)=Documentation
 861 endif
 862         $(call vmlinux-modpost)
 863         $(call if_changed_rule,vmlinux__)
 864         $(Q)rm -f .old_version
 865
 866 # build vmlinux.o first to catch section mismatch errors early
 867 ifdef CONFIG_KALLSYMS
 868 .tmp_vmlinux1: vmlinux.o
 869 endif
 870
 871 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 872 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 873         $(call if_changed_rule,vmlinux-modpost)
 874
 875 # The actual objects are generated when descending,
 876 # make sure no implicit rule kicks in
 877 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 878
 879 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 880 # Preset locale variables to speed up the build process. Limit locale
 881 # tweaks to this spot to avoid wrong language settings when running
 882 # make menuconfig etc.
 883 # Error messages still appears in the original language
 884
 885 PHONY += $(vmlinux-dirs)
 886 $(vmlinux-dirs): prepare scripts
 887         $(Q)$(MAKE) $(build)=$@
 888
 889 # Build the kernel release string
 890 #
 891 # The KERNELRELEASE value built here is stored in the file
 892 # include/config/kernel.release, and is used when executing several
 893 # make targets, such as "make install" or "make modules_install."
 894 #
 895 # The eventual kernel release string consists of the following fields,
 896 # shown in a hierarchical format to show how smaller parts are concatenated
 897 # to form the larger and final value, with values coming from places like
 898 # the Makefile, kernel config options, make command line options and/or
 899 # SCM tag information.
 900 #
 901 #       $(KERNELVERSION)
 902 #         $(VERSION)                    eg, 2
 903 #         $(PATCHLEVEL)                 eg, 6
 904 #         $(SUBLEVEL)                   eg, 18
 905 #         $(EXTRAVERSION)               eg, -rc6
 906 #       $(localver-full)
 907 #         $(localver)
 908 #           localversion*               (files without backups, containing '~')
 909 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 910 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 911 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 912 #           $(LOCALVERSION)             (from make command line if provided)
 913 #
 914 #  Note how the final $(localver-auto) string is included *only* if the
 915 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 916 # moment, only git is supported but other SCMs can edit the script
 917 # scripts/setlocalversion and add the appropriate checks as needed.
 918
 919 pattern = ".*/localversion[^~]*"
 920 string  = $(shell cat /dev/null \
 921            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 922
 923 localver = $(subst $(space),, $(string) \
 924                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 925
 926 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 927 # and if the SCM is know a tag from the SCM is appended.
 928 # The appended tag is determined by the SCM used.
 929 #
 930 # Currently, only git is supported.
 931 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 932 # checks as needed.
 933 ifdef CONFIG_LOCALVERSION_AUTO
 934         _localver-auto = $(shell $(CONFIG_SHELL) \
 935                           $(srctree)/scripts/setlocalversion $(srctree))
 936         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 937 endif
 938
 939 localver-full = $(localver)$(localver-auto)
 940
 941 # Store (new) KERNELRELASE string in include/config/kernel.release
 942 kernelrelease = $(KERNELVERSION)$(localver-full)
 943 include/config/kernel.release: include/config/auto.conf FORCE
 944         $(Q)rm -f $@
 945         $(Q)echo $(kernelrelease) > $@
 946
 947
 948 # Things we need to do before we recursively start building the kernel
 949 # or the modules are listed in "prepare".
 950 # A multi level approach is used. prepareN is processed before prepareN-1.
 951 # archprepare is used in arch Makefiles and when processed asm symlink,
 952 # version.h and scripts_basic is processed / created.
 953
 954 # Listed in dependency order
 955 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 956
 957 # prepare3 is used to check if we are building in a separate output directory,
 958 # and if so do:
 959 # 1) Check that make has not been executed in the kernel src $(srctree)
 960 # 2) Create the include2 directory, used for the second asm symlink
 961 prepare3: include/config/kernel.release
 962 ifneq ($(KBUILD_SRC),)
 963         @$(kecho) '  Using $(srctree) as source for kernel'
 964         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 965                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 966                 echo "  in the '$(srctree)' directory.";\
 967                 /bin/false; \
 968         fi;
 969         $(Q)if [ ! -d include2 ]; then                                  \
 970             mkdir -p include2;                                          \
 971             ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 972         fi
 973         ln -fsn $(srctree) source
 974 endif
 975
 976 # prepare2 creates a makefile if using a separate output directory
 977 prepare2: prepare3 outputmakefile
 978
 979 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 980                    include/asm include/config/auto.conf
 981         $(cmd_crmodverdir)
 982
 983 archprepare: prepare1 scripts_basic
 984
 985 prepare0: archprepare FORCE
 986         $(Q)$(MAKE) $(build)=.
 987         $(Q)$(MAKE) $(build)=. missing-syscalls
 988
 989 # All the preparing..
 990 prepare: prepare0
 991
 992 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 993 # done in arch/$(ARCH)/kernel/Makefile
 994
 995 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 996
 997 # The asm symlink changes when $(ARCH) changes.
 998 # Detect this and ask user to run make mrproper
 999 # If asm is a stale symlink (point to dir that does not exist) remove it
1000 define check-symlink
1001         set -e;                                                            \
1002         if [ -L include/asm ]; then                                        \
1003                 asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
1004                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
1005                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1006                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
1007                         exit 1;                                            \
1008                 fi;                                                        \
1009                 test -e $$asmlink || rm include/asm;                       \
1010         elif [ -d include/asm ]; then                                      \
1011                 echo "ERROR: $@ is a directory but a symlink was expected";\
1012                 exit 1;                                                    \
1013         fi
1014 endef
1015
1016 # We create the target directory of the symlink if it does
1017 # not exist so the test in check-symlink works and we have a
1018 # directory for generated filesas used by some architectures.
1019 define create-symlink
1020         if [ ! -L include/asm ]; then                                      \
1021                         $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1022                         if [ ! -d include/asm-$(SRCARCH) ]; then           \
1023                                 mkdir -p include/asm-$(SRCARCH);           \
1024                         fi;                                                \
1025                         ln -fsn asm-$(SRCARCH) $@;                         \
1026         fi
1027 endef
1028
1029 include/asm: FORCE
1030         $(Q)$(check-symlink)
1031         $(Q)$(create-symlink)
1032
1033 # Generate some files
1034 # ---------------------------------------------------------------------------
1035
1036 # KERNELRELEASE can change from a few different places, meaning version.h
1037 # needs to be updated, so this check is forced on all builds
1038
1039 uts_len := 64
1040 define filechk_utsrelease.h
1041         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1042           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1043           exit 1;                                                         \
1044         fi;                                                               \
1045         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1046 endef
1047
1048 define filechk_version.h
1049         (echo \#define LINUX_VERSION_CODE $(shell                             \
1050         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1051         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1052 endef
1053
1054 include/linux/version.h: $(srctree)/Makefile FORCE
1055         $(call filechk,version.h)
1056
1057 include/linux/utsrelease.h: include/config/kernel.release FORCE
1058         $(call filechk,utsrelease.h)
1059
1060 PHONY += headerdep
1061 headerdep:
1062         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1063
1064 # ---------------------------------------------------------------------------
1065
1066 PHONY += depend dep
1067 depend dep:
1068         @echo '*** Warning: make $@ is unnecessary now.'
1069
1070 # ---------------------------------------------------------------------------
1071 # Firmware install
1072 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1073 export INSTALL_FW_PATH
1074
1075 PHONY += firmware_install
1076 firmware_install: FORCE
1077         @mkdir -p $(objtree)/firmware
1078         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1079
1080 # ---------------------------------------------------------------------------
1081 # Kernel headers
1082
1083 #Default location for installed headers
1084 export INSTALL_HDR_PATH = $(objtree)/usr
1085
1086 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1087 # Find out where the Kbuild file is located to support
1088 # arch/$(ARCH)/include/asm
1089 hdr-dir = $(strip                                                         \
1090           $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1091                arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1092
1093 # If we do an all arch process set dst to asm-$(hdr-arch)
1094 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1095
1096 PHONY += __headers
1097 __headers: include/linux/version.h scripts_basic FORCE
1098         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1099
1100 PHONY += headers_install_all
1101 headers_install_all:
1102         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1103
1104 PHONY += headers_install
1105 headers_install: __headers
1106         $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1107         $(error Headers not exportable for the $(SRCARCH) architecture))
1108         $(Q)$(MAKE) $(hdr-inst)=include
1109         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1110
1111 PHONY += headers_check_all
1112 headers_check_all: headers_install_all
1113         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1114
1115 PHONY += headers_check
1116 headers_check: headers_install
1117         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1118         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1119
1120 # ---------------------------------------------------------------------------
1121 # Modules
1122
1123 ifdef CONFIG_MODULES
1124
1125 # By default, build modules as well
1126
1127 all: modules
1128
1129 #       Build modules
1130 #
1131 #       A module can be listed more than once in obj-m resulting in
1132 #       duplicate lines in modules.order files.  Those are removed
1133 #       using awk while concatenating to the final file.
1134
1135 PHONY += modules
1136 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1137         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1138         @$(kecho) '  Building modules, stage 2.';
1139         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1140         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1141
1142
1143 # Target to prepare building external modules
1144 PHONY += modules_prepare
1145 modules_prepare: prepare scripts
1146
1147 # Target to install modules
1148 PHONY += modules_install
1149 modules_install: _modinst_ _modinst_post
1150
1151 PHONY += _modinst_
1152 _modinst_:
1153         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1154                 echo "Warning: you may need to install module-init-tools"; \
1155                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1156                 sleep 1; \
1157         fi
1158         @rm -rf $(MODLIB)/kernel
1159         @rm -f $(MODLIB)/source
1160         @mkdir -p $(MODLIB)/kernel
1161         @ln -s $(srctree) $(MODLIB)/source
1162         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1163                 rm -f $(MODLIB)/build ; \
1164                 ln -s $(objtree) $(MODLIB)/build ; \
1165         fi
1166         @cp -f $(objtree)/modules.order $(MODLIB)/
1167         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1168
1169 # This depmod is only for convenience to give the initial
1170 # boot a modules.dep even before / is mounted read-write.  However the
1171 # boot script depmod is the master version.
1172 PHONY += _modinst_post
1173 _modinst_post: _modinst_
1174         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1175         $(call cmd,depmod)
1176
1177 else # CONFIG_MODULES
1178
1179 # Modules not configured
1180 # ---------------------------------------------------------------------------
1181
1182 modules modules_install: FORCE
1183         @echo
1184         @echo "The present kernel configuration has modules disabled."
1185         @echo "Type 'make config' and enable loadable module support."
1186         @echo "Then build a kernel with module support enabled."
1187         @echo
1188         @exit 1
1189
1190 endif # CONFIG_MODULES
1191
1192 ###
1193 # Cleaning is done on three levels.
1194 # make clean     Delete most generated files
1195 #                Leave enough to build external modules
1196 # make mrproper  Delete the current configuration, and all generated files
1197 # make distclean Remove editor backup files, patch leftover files and the like
1198
1199 # Directories & files removed with 'make clean'
1200 CLEAN_DIRS  += $(MODVERDIR)
1201 CLEAN_FILES +=  vmlinux System.map \
1202                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1203
1204 # Directories & files removed with 'make mrproper'
1205 MRPROPER_DIRS  += include/config include2 usr/include
1206 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1207                   include/linux/autoconf.h include/linux/version.h      \
1208                   include/linux/utsrelease.h                            \
1209                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1210                   Module.symvers Module.markers tags TAGS cscope*
1211
1212 # clean - Delete most, but leave enough to build external modules
1213 #
1214 clean: rm-dirs  := $(CLEAN_DIRS)
1215 clean: rm-files := $(CLEAN_FILES)
1216 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1217
1218 PHONY += $(clean-dirs) clean archclean
1219 $(clean-dirs):
1220         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1221
1222 clean: archclean $(clean-dirs)
1223         $(call cmd,rmdirs)
1224         $(call cmd,rmfiles)
1225         @find . $(RCS_FIND_IGNORE) \
1226                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1227                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1228                 -o -name '*.symtypes' -o -name 'modules.order' \
1229                 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1230                 -type f -print | xargs rm -f
1231
1232 # mrproper - Delete all generated files, including .config
1233 #
1234 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1235 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1236 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1237
1238 PHONY += $(mrproper-dirs) mrproper archmrproper
1239 $(mrproper-dirs):
1240         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1241
1242 mrproper: clean archmrproper $(mrproper-dirs)
1243         $(call cmd,rmdirs)
1244         $(call cmd,rmfiles)
1245
1246 # distclean
1247 #
1248 PHONY += distclean
1249
1250 distclean: mrproper
1251         @find $(srctree) $(RCS_FIND_IGNORE) \
1252                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1253                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1254                 -o -name '.*.rej' -o -size 0 \
1255                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1256                 -type f -print | xargs rm -f
1257
1258
1259 # Packaging of the kernel to various formats
1260 # ---------------------------------------------------------------------------
1261 # rpm target kept for backward compatibility
1262 package-dir     := $(srctree)/scripts/package
1263
1264 %pkg: include/config/kernel.release FORCE
1265         $(Q)$(MAKE) $(build)=$(package-dir) $@
1266 rpm: include/config/kernel.release FORCE
1267         $(Q)$(MAKE) $(build)=$(package-dir) $@
1268
1269
1270 # Brief documentation of the typical targets used
1271 # ---------------------------------------------------------------------------
1272
1273 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1274 boards := $(notdir $(boards))
1275 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1276 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1277
1278 help:
1279         @echo  'Cleaning targets:'
1280         @echo  '  clean           - Remove most generated files but keep the config and'
1281         @echo  '                    enough build support to build external modules'
1282         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1283         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1284         @echo  ''
1285         @echo  'Configuration targets:'
1286         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1287         @echo  ''
1288         @echo  'Other generic targets:'
1289         @echo  '  all             - Build all targets marked with [*]'
1290         @echo  '* vmlinux         - Build the bare kernel'
1291         @echo  '* modules         - Build all modules'
1292         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1293         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1294         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1295         @echo  '  dir/            - Build all files in dir and below'
1296         @echo  '  dir/file.[ois]  - Build specified target only'
1297         @echo  '  dir/file.ko     - Build module including final link'
1298         @echo  '  prepare         - Set up for building external modules'
1299         @echo  '  tags/TAGS       - Generate tags file for editors'
1300         @echo  '  cscope          - Generate cscope index'
1301         @echo  '  kernelrelease   - Output the release version string'
1302         @echo  '  kernelversion   - Output the version stored in Makefile'
1303         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1304          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1305          echo  ''
1306         @echo  'Static analysers'
1307         @echo  '  checkstack      - Generate a list of stack hogs'
1308         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1309         @echo  '  versioncheck    - Sanity check on version.h usage'
1310         @echo  '  includecheck    - Check for duplicate included header files'
1311         @echo  '  export_report   - List the usages of all exported symbols'
1312         @echo  '  headers_check   - Sanity check on exported headers'
1313         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1314          echo  ''
1315         @echo  'Kernel packaging:'
1316         @$(MAKE) $(build)=$(package-dir) help
1317         @echo  ''
1318         @echo  'Documentation targets:'
1319         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1320         @echo  ''
1321         @echo  'Architecture specific targets ($(SRCARCH)):'
1322         @$(if $(archhelp),$(archhelp),\
1323                 echo '  No architecture specific help defined for $(SRCARCH)')
1324         @echo  ''
1325         @$(if $(boards), \
1326                 $(foreach b, $(boards), \
1327                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1328                 echo '')
1329         @$(if $(board-dirs), \
1330                 $(foreach b, $(board-dirs), \
1331                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1332                 printf "  %-16s - Show all of the above\\n" help-boards; \
1333                 echo '')
1334
1335         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1336         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1337         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1338         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1339         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1340         @echo  ''
1341         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1342         @echo  'For further info see the ./README file'
1343
1344
1345 help-board-dirs := $(addprefix help-,$(board-dirs))
1346
1347 help-boards: $(help-board-dirs)
1348
1349 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1350
1351 $(help-board-dirs): help-%:
1352         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1353         @$(if $(boards-per-dir), \
1354                 $(foreach b, $(boards-per-dir), \
1355                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1356                 echo '')
1357
1358
1359 # Documentation targets
1360 # ---------------------------------------------------------------------------
1361 %docs: scripts_basic FORCE
1362         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1363
1364 else # KBUILD_EXTMOD
1365
1366 ###
1367 # External module support.
1368 # When building external modules the kernel used as basis is considered
1369 # read-only, and no consistency checks are made and the make
1370 # system is not used on the basis kernel. If updates are required
1371 # in the basis kernel ordinary make commands (without M=...) must
1372 # be used.
1373 #
1374 # The following are the only valid targets when building external
1375 # modules.
1376 # make M=dir clean     Delete all automatically generated files
1377 # make M=dir modules   Make all modules in specified dir
1378 # make M=dir           Same as 'make M=dir modules'
1379 # make M=dir modules_install
1380 #                      Install the modules built in the module directory
1381 #                      Assumes install directory is already created
1382
1383 # We are always building modules
1384 KBUILD_MODULES := 1
1385 PHONY += crmodverdir
1386 crmodverdir:
1387         $(cmd_crmodverdir)
1388
1389 PHONY += $(objtree)/Module.symvers
1390 $(objtree)/Module.symvers:
1391         @test -e $(objtree)/Module.symvers || ( \
1392         echo; \
1393         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1394         echo "           is missing; modules will have no dependencies and modversions."; \
1395         echo )
1396
1397 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1398 PHONY += $(module-dirs) modules
1399 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1400         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1401
1402 modules: $(module-dirs)
1403         @$(kecho) '  Building modules, stage 2.';
1404         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1405
1406 PHONY += modules_install
1407 modules_install: _emodinst_ _emodinst_post
1408
1409 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1410 PHONY += _emodinst_
1411 _emodinst_:
1412         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1413         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1414
1415 PHONY += _emodinst_post
1416 _emodinst_post: _emodinst_
1417         $(call cmd,depmod)
1418
1419 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1420
1421 PHONY += $(clean-dirs) clean
1422 $(clean-dirs):
1423         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1424
1425 clean:  rm-dirs := $(MODVERDIR)
1426 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1427 clean: $(clean-dirs)
1428         $(call cmd,rmdirs)
1429         $(call cmd,rmfiles)
1430         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1431                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1432                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1433                 -type f -print | xargs rm -f
1434
1435 help:
1436         @echo  '  Building external modules.'
1437         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1438         @echo  ''
1439         @echo  '  modules         - default target, build the module(s)'
1440         @echo  '  modules_install - install the module'
1441         @echo  '  clean           - remove generated files in module directory only'
1442         @echo  ''
1443
1444 # Dummies...
1445 PHONY += prepare scripts
1446 prepare: ;
1447 scripts: ;
1448 endif # KBUILD_EXTMOD
1449
1450 # Generate tags for editors
1451 # ---------------------------------------------------------------------------
1452 quiet_cmd_tags = GEN     $@
1453       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1454
1455 tags TAGS cscope: FORCE
1456         $(call cmd,tags)
1457
1458 # Scripts to check various things for consistency
1459 # ---------------------------------------------------------------------------
1460
1461 includecheck:
1462         find * $(RCS_FIND_IGNORE) \
1463                 -name '*.[hcS]' -type f -print | sort \
1464                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1465
1466 versioncheck:
1467         find * $(RCS_FIND_IGNORE) \
1468                 -name '*.[hcS]' -type f -print | sort \
1469                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1470
1471 namespacecheck:
1472         $(PERL) $(srctree)/scripts/namespace.pl
1473
1474 export_report:
1475         $(PERL) $(srctree)/scripts/export_report.pl
1476
1477 endif #ifeq ($(config-targets),1)
1478 endif #ifeq ($(mixed-targets),1)
1479
1480 PHONY += checkstack kernelrelease kernelversion
1481
1482 # UML needs a little special treatment here.  It wants to use the host
1483 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1484 # else wants $(ARCH), including people doing cross-builds, which means
1485 # that $(SUBARCH) doesn't work here.
1486 ifeq ($(ARCH), um)
1487 CHECKSTACK_ARCH := $(SUBARCH)
1488 else
1489 CHECKSTACK_ARCH := $(ARCH)
1490 endif
1491 checkstack:
1492         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1493         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1494
1495 kernelrelease:
1496         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1497         $(error kernelrelease not valid - run 'make prepare' to update it))
1498 kernelversion:
1499         @echo $(KERNELVERSION)
1500
1501 # Single targets
1502 # ---------------------------------------------------------------------------
1503 # Single targets are compatible with:
1504 # - build with mixed source and output
1505 # - build with separate output dir 'make O=...'
1506 # - external modules
1507 #
1508 #  target-dir => where to store outputfile
1509 #  build-dir  => directory in kernel source tree to use
1510
1511 ifeq ($(KBUILD_EXTMOD),)
1512         build-dir  = $(patsubst %/,%,$(dir $@))
1513         target-dir = $(dir $@)
1514 else
1515         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1516         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1517         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1518 endif
1519
1520 %.s: %.c prepare scripts FORCE
1521         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1522 %.i: %.c prepare scripts FORCE
1523         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524 %.o: %.c prepare scripts FORCE
1525         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526 %.lst: %.c prepare scripts FORCE
1527         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528 %.s: %.S prepare scripts FORCE
1529         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530 %.o: %.S prepare scripts FORCE
1531         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1532 %.symtypes: %.c prepare scripts FORCE
1533         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1534
1535 # Modules
1536 /: prepare scripts FORCE
1537         $(cmd_crmodverdir)
1538         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1539         $(build)=$(build-dir)
1540 %/: prepare scripts FORCE
1541         $(cmd_crmodverdir)
1542         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1543         $(build)=$(build-dir)
1544 %.ko: prepare scripts FORCE
1545         $(cmd_crmodverdir)
1546         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1547         $(build)=$(build-dir) $(@:.ko=.o)
1548         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1549
1550 # FIXME Should go into a make.lib or something
1551 # ===========================================================================
1552
1553 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1554       cmd_rmdirs = rm -rf $(rm-dirs)
1555
1556 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1557       cmd_rmfiles = rm -f $(rm-files)
1558
1559 # Run depmod only if we have System.map and depmod is executable
1560 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1561       cmd_depmod = \
1562         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1563                 $(DEPMOD) -ae -F System.map                                     \
1564                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1565                 $(KERNELRELEASE);                                               \
1566         fi
1567
1568 # Create temporary dir for module support files
1569 # clean it up only when building all modules
1570 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1571                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1572
1573 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1574           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1575           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1576
1577 quiet_cmd_as_o_S = AS      $@
1578 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1579
1580 # read all saved command lines
1581
1582 targets := $(wildcard $(sort $(targets)))
1583 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1584
1585 ifneq ($(cmd_files),)
1586   $(cmd_files): ;       # Do not try to update included dependency files
1587   include $(cmd_files)
1588 endif
1589
1590 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1591 # Usage:
1592 # $(Q)$(MAKE) $(clean)=dir
1593 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1594
1595 endif   # skip-makefile
1596
1597 PHONY += FORCE
1598 FORCE:
1599
1600 # Declare the contents of the .PHONY variable as phony.  We keep that
1601 # information in a variable se we can use it in if_changed and friends.
1602 .PHONY: $(PHONY)