Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 28
   4 EXTRAVERSION =
   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 # We are using a recursive build, so we need to do a little thinking
  20 # to get the ordering right.
  21 #
  22 # Most importantly: sub-Makefiles should only ever modify files in
  23 # their own directory. If in some directory we have a dependency on
  24 # a file in another dir (which doesn't happen often, but it's often
  25 # unavoidable when linking the built-in.o targets which finally
  26 # turn into vmlinux), we will call a sub make in that other dir, and
  27 # after that we are sure that everything which is in that other dir
  28 # is now up to date.
  29 #
  30 # The only cases where we need to modify files which have global
  31 # effects are thus separated out and done before the recursive
  32 # descending is started. They are now explicitly listed as the
  33 # prepare rule.
  34
  35 # To put more focus on warnings, be less verbose as default
  36 # Use 'make V=1' to see the full commands
  37
  38 ifdef V
  39   ifeq ("$(origin V)", "command line")
  40     KBUILD_VERBOSE = $(V)
  41   endif
  42 endif
  43 ifndef KBUILD_VERBOSE
  44   KBUILD_VERBOSE = 0
  45 endif
  46
  47 # Call a source code checker (by default, "sparse") as part of the
  48 # C compilation.
  49 #
  50 # Use 'make C=1' to enable checking of only re-compiled files.
  51 # Use 'make C=2' to enable checking of *all* source files, regardless
  52 # of whether they are re-compiled or not.
  53 #
  54 # See the file "Documentation/sparse.txt" for more details, including
  55 # where to get the "sparse" utility.
  56
  57 ifdef C
  58   ifeq ("$(origin C)", "command line")
  59     KBUILD_CHECKSRC = $(C)
  60   endif
  61 endif
  62 ifndef KBUILD_CHECKSRC
  63   KBUILD_CHECKSRC = 0
  64 endif
  65
  66 # Use make M=dir to specify directory of external module to build
  67 # Old syntax make ... SUBDIRS=$PWD is still supported
  68 # Setting the environment variable KBUILD_EXTMOD take precedence
  69 ifdef SUBDIRS
  70   KBUILD_EXTMOD ?= $(SUBDIRS)
  71 endif
  72 ifdef M
  73   ifeq ("$(origin M)", "command line")
  74     KBUILD_EXTMOD := $(M)
  75   endif
  76 endif
  77
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(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 ifdef O
 102   ifeq ("$(origin O)", "command line")
 103     KBUILD_OUTPUT := $(O)
 104   endif
 105 endif
 106
 107 # That's our default target when none is given on the command line
 108 PHONY := _all
 109 _all:
 110
 111 # Cancel implicit rules on top Makefile
 112 $(CURDIR)/Makefile Makefile: ;
 113
 114 ifneq ($(KBUILD_OUTPUT),)
 115 # Invoke a second make in the output directory, passing relevant variables
 116 # check that the output directory actually exists
 117 saved-output := $(KBUILD_OUTPUT)
 118 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 119 $(if $(KBUILD_OUTPUT),, \
 120      $(error output directory "$(saved-output)" does not exist))
 121
 122 PHONY += $(MAKECMDGOALS) sub-make
 123
 124 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 125         $(Q)@:
 126
 127 sub-make: FORCE
 128         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 129         KBUILD_SRC=$(CURDIR) \
 130         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 131         $(filter-out _all sub-make,$(MAKECMDGOALS))
 132
 133 # Leave processing to above invocation of make
 134 skip-makefile := 1
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136 endif # ifeq ($(KBUILD_SRC),)
 137
 138 # We process the rest of the Makefile if this is the final invocation of make
 139 ifeq ($(skip-makefile),)
 140
 141 # If building an external module we do not care about the all: rule
 142 # but instead _all depend on modules
 143 PHONY += all
 144 ifeq ($(KBUILD_EXTMOD),)
 145 _all: all
 146 else
 147 _all: modules
 148 endif
 149
 150 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 151 TOPDIR          := $(srctree)
 152 # FIXME - TOPDIR is obsolete, use srctree/objtree
 153 objtree         := $(CURDIR)
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH TOPDIR
 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.*/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 # Default value for CROSS_COMPILE is not to prefix executables
 191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192 export KBUILD_BUILDHOST := $(SUBARCH)
 193 ARCH            ?= $(SUBARCH)
 194 CROSS_COMPILE   ?=
 195
 196 # Architecture as present in compile.h
 197 UTS_MACHINE     := $(ARCH)
 198 SRCARCH         := $(ARCH)
 199
 200 # Additional ARCH settings for x86
 201 ifeq ($(ARCH),i386)
 202         SRCARCH := x86
 203 endif
 204 ifeq ($(ARCH),x86_64)
 205         SRCARCH := x86
 206 endif
 207
 208 # Additional ARCH settings for sparc
 209 ifeq ($(ARCH),sparc64)
 210        SRCARCH := sparc
 211 endif
 212
 213 # Where to locate arch specific headers
 214 hdr-arch  := $(SRCARCH)
 215
 216 KCONFIG_CONFIG  ?= .config
 217
 218 # SHELL used by kbuild
 219 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 220           else if [ -x /bin/bash ]; then echo /bin/bash; \
 221           else echo sh; fi ; fi)
 222
 223 HOSTCC       = gcc
 224 HOSTCXX      = g++
 225 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 226 HOSTCXXFLAGS = -O2
 227
 228 # Decide whether to build built-in, modular, or both.
 229 # Normally, just do built-in.
 230
 231 KBUILD_MODULES :=
 232 KBUILD_BUILTIN := 1
 233
 234 #       If we have only "make modules", don't compile built-in objects.
 235 #       When we're building modules with modversions, we need to consider
 236 #       the built-in objects during the descend as well, in order to
 237 #       make sure the checksums are up to date before we record them.
 238
 239 ifeq ($(MAKECMDGOALS),modules)
 240   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 241 endif
 242
 243 #       If we have "make <whatever> modules", compile modules
 244 #       in addition to whatever we do anyway.
 245 #       Just "make" or "make all" shall build modules as well
 246
 247 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 248   KBUILD_MODULES := 1
 249 endif
 250
 251 ifeq ($(MAKECMDGOALS),)
 252   KBUILD_MODULES := 1
 253 endif
 254
 255 export KBUILD_MODULES KBUILD_BUILTIN
 256 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 257
 258 # Beautify output
 259 # ---------------------------------------------------------------------------
 260 #
 261 # Normally, we echo the whole command before executing it. By making
 262 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 263 # $(quiet) to choose other forms of output instead, e.g.
 264 #
 265 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 266 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 267 #
 268 # If $(quiet) is empty, the whole command will be printed.
 269 # If it is set to "quiet_", only the short version will be printed.
 270 # If it is set to "silent_", nothing will be printed at all, since
 271 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 272 #
 273 # A simple variant is to prefix commands with $(Q) - that's useful
 274 # for commands that shall be hidden in non-verbose mode.
 275 #
 276 #       $(Q)ln $@ :<
 277 #
 278 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 279 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 280
 281 ifeq ($(KBUILD_VERBOSE),1)
 282   quiet =
 283   Q =
 284 else
 285   quiet=quiet_
 286   Q = @
 287 endif
 288
 289 # If the user is running make -s (silent mode), suppress echoing of
 290 # commands
 291
 292 ifneq ($(findstring s,$(MAKEFLAGS)),)
 293   quiet=silent_
 294 endif
 295
 296 export quiet Q KBUILD_VERBOSE
 297
 298
 299 # Look for make include files relative to root of kernel src
 300 MAKEFLAGS += --include-dir=$(srctree)
 301
 302 # We need some generic definitions (do not try to remake the file).
 303 $(srctree)/scripts/Kbuild.include: ;
 304 include $(srctree)/scripts/Kbuild.include
 305
 306 # Make variables (CC, etc...)
 307
 308 AS              = $(CROSS_COMPILE)as
 309 LD              = $(CROSS_COMPILE)ld
 310 CC              = $(CROSS_COMPILE)gcc
 311 CPP             = $(CC) -E
 312 AR              = $(CROSS_COMPILE)ar
 313 NM              = $(CROSS_COMPILE)nm
 314 STRIP           = $(CROSS_COMPILE)strip
 315 OBJCOPY         = $(CROSS_COMPILE)objcopy
 316 OBJDUMP         = $(CROSS_COMPILE)objdump
 317 AWK             = awk
 318 GENKSYMS        = scripts/genksyms/genksyms
 319 DEPMOD          = /sbin/depmod
 320 KALLSYMS        = scripts/kallsyms
 321 PERL            = perl
 322 CHECK           = sparse
 323
 324 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 325 MODFLAGS        = -DMODULE
 326 CFLAGS_MODULE   = $(MODFLAGS)
 327 AFLAGS_MODULE   = $(MODFLAGS)
 328 LDFLAGS_MODULE  =
 329 CFLAGS_KERNEL   =
 330 AFLAGS_KERNEL   =
 331
 332
 333 # Use LINUXINCLUDE when you must reference the include/ directory.
 334 # Needed to be compatible with the O= option
 335 LINUXINCLUDE    := -Iinclude \
 336                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 337                    -I$(srctree)/arch/$(hdr-arch)/include               \
 338                    -include include/linux/autoconf.h
 339
 340 KBUILD_CPPFLAGS := -D__KERNEL__
 341
 342 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 343                    -fno-strict-aliasing -fno-common \
 344                    -Werror-implicit-function-declaration
 345 KBUILD_AFLAGS   := -D__ASSEMBLY__
 346
 347 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 348 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 349 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 350
 351 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 352 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 353 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 354 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 355
 356 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 357 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 358 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 359
 360 # When compiling out-of-tree modules, put MODVERDIR in the module
 361 # tree rather than in the kernel tree. The kernel tree might
 362 # even be read-only.
 363 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 364
 365 # Files to ignore in find ... statements
 366
 367 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
 368 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 369
 370 # ===========================================================================
 371 # Rules shared between *config targets and build targets
 372
 373 # Basic helpers built in scripts/
 374 PHONY += scripts_basic
 375 scripts_basic:
 376         $(Q)$(MAKE) $(build)=scripts/basic
 377
 378 # To avoid any implicit rule to kick in, define an empty command.
 379 scripts/basic/%: scripts_basic ;
 380
 381 PHONY += outputmakefile
 382 # outputmakefile generates a Makefile in the output directory, if using a
 383 # separate output directory. This allows convenient use of make in the
 384 # output directory.
 385 outputmakefile:
 386 ifneq ($(KBUILD_SRC),)
 387         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 388             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 389 endif
 390
 391 # To make sure we do not include .config for any of the *config targets
 392 # catch them early, and hand them over to scripts/kconfig/Makefile
 393 # It is allowed to specify more targets when calling make, including
 394 # mixing *config targets and build targets.
 395 # For example 'make oldconfig all'.
 396 # Detect when mixed targets is specified, and make a second invocation
 397 # of make so .config is not included in this case either (for *config).
 398
 399 no-dot-config-targets := clean mrproper distclean \
 400                          cscope TAGS tags help %docs check% \
 401                          include/linux/version.h headers_% \
 402                          kernelrelease kernelversion
 403
 404 config-targets := 0
 405 mixed-targets  := 0
 406 dot-config     := 1
 407
 408 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 409         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 410                 dot-config := 0
 411         endif
 412 endif
 413
 414 ifeq ($(KBUILD_EXTMOD),)
 415         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 416                 config-targets := 1
 417                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 418                         mixed-targets := 1
 419                 endif
 420         endif
 421 endif
 422
 423 ifeq ($(mixed-targets),1)
 424 # ===========================================================================
 425 # We're called with mixed targets (*config and build targets).
 426 # Handle them one by one.
 427
 428 %:: FORCE
 429         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 430
 431 else
 432 ifeq ($(config-targets),1)
 433 # ===========================================================================
 434 # *config targets only - make sure prerequisites are updated, and descend
 435 # in scripts/kconfig to make the *config target
 436
 437 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 438 # KBUILD_DEFCONFIG may point out an alternative default configuration
 439 # used for 'make defconfig'
 440 include $(srctree)/arch/$(SRCARCH)/Makefile
 441 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 442
 443 config: scripts_basic outputmakefile FORCE
 444         $(Q)mkdir -p include/linux include/config
 445         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 446
 447 %config: scripts_basic outputmakefile FORCE
 448         $(Q)mkdir -p include/linux include/config
 449         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 450
 451 else
 452 # ===========================================================================
 453 # Build targets only - this includes vmlinux, arch specific targets, clean
 454 # targets and others. In general all targets except *config targets.
 455
 456 ifeq ($(KBUILD_EXTMOD),)
 457 # Additional helpers built in scripts/
 458 # Carefully list dependencies so we do not try to build scripts twice
 459 # in parallel
 460 PHONY += scripts
 461 scripts: scripts_basic include/config/auto.conf
 462         $(Q)$(MAKE) $(build)=$(@)
 463
 464 # Objects we will link into vmlinux / subdirs we need to visit
 465 init-y          := init/
 466 drivers-y       := drivers/ sound/ firmware/
 467 net-y           := net/
 468 libs-y          := lib/
 469 core-y          := usr/
 470 endif # KBUILD_EXTMOD
 471
 472 ifeq ($(dot-config),1)
 473 # Read in config
 474 -include include/config/auto.conf
 475
 476 ifeq ($(KBUILD_EXTMOD),)
 477 # Read in dependencies to all Kconfig* files, make sure to run
 478 # oldconfig if changes are detected.
 479 -include include/config/auto.conf.cmd
 480
 481 # To avoid any implicit rule to kick in, define an empty command
 482 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 483
 484 # If .config is newer than include/config/auto.conf, someone tinkered
 485 # with it and forgot to run make oldconfig.
 486 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 487 # we execute the config step to be sure to catch updated Kconfig files
 488 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 489         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 490 else
 491 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 492 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 493 PHONY += include/config/auto.conf
 494
 495 include/config/auto.conf:
 496         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 497         echo;                                                           \
 498         echo "  ERROR: Kernel configuration is invalid.";               \
 499         echo "         include/linux/autoconf.h or $@ are missing.";    \
 500         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 501         echo;                                                           \
 502         /bin/false)
 503
 504 endif # KBUILD_EXTMOD
 505
 506 else
 507 # Dummy target needed, because used as prerequisite
 508 include/config/auto.conf: ;
 509 endif # $(dot-config)
 510
 511 # The all: target is the default when no target is given on the
 512 # command line.
 513 # This allow a user to issue only 'make' to build a kernel including modules
 514 # Defaults vmlinux but it is usually overridden in the arch makefile
 515 all: vmlinux
 516
 517 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 518 KBUILD_CFLAGS   += -Os
 519 else
 520 KBUILD_CFLAGS   += -O2
 521 endif
 522
 523 include $(srctree)/arch/$(SRCARCH)/Makefile
 524
 525 ifneq (CONFIG_FRAME_WARN,0)
 526 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 527 endif
 528
 529 # Force gcc to behave correct even for buggy distributions
 530 # Arch Makefiles may override this setting
 531 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 532
 533 ifdef CONFIG_FRAME_POINTER
 534 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 535 else
 536 KBUILD_CFLAGS   += -fomit-frame-pointer
 537 endif
 538
 539 ifdef CONFIG_DEBUG_INFO
 540 KBUILD_CFLAGS   += -g
 541 KBUILD_AFLAGS   += -gdwarf-2
 542 endif
 543
 544 ifdef CONFIG_FUNCTION_TRACER
 545 KBUILD_CFLAGS   += -pg
 546 endif
 547
 548 # We trigger additional mismatches with less inlining
 549 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 550 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 551 endif
 552
 553 # arch Makefile may override CC so keep this after arch Makefile is included
 554 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 555 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 556
 557 # warn about C99 declaration after statement
 558 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 559
 560 # disable pointer signed / unsigned warnings in gcc 4.0
 561 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 562
 563 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 564 # But warn user when we do so
 565 warn-assign = \
 566 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 567
 568 ifneq ($(KCPPFLAGS),)
 569         $(call warn-assign,CPPFLAGS)
 570         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 571 endif
 572 ifneq ($(KAFLAGS),)
 573         $(call warn-assign,AFLAGS)
 574         KBUILD_AFLAGS += $(KAFLAGS)
 575 endif
 576 ifneq ($(KCFLAGS),)
 577         $(call warn-assign,CFLAGS)
 578         KBUILD_CFLAGS += $(KCFLAGS)
 579 endif
 580
 581 # Use --build-id when available.
 582 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 583                               $(call ld-option, -Wl$(comma)--build-id,))
 584 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 585 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 586
 587 # Default kernel image to build when no specific target is given.
 588 # KBUILD_IMAGE may be overruled on the command line or
 589 # set in the environment
 590 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 591 # this default value
 592 export KBUILD_IMAGE ?= vmlinux
 593
 594 #
 595 # INSTALL_PATH specifies where to place the updated kernel and system map
 596 # images. Default is /boot, but you can set it to other values
 597 export  INSTALL_PATH ?= /boot
 598
 599 #
 600 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 601 # relocations required by build roots.  This is not defined in the
 602 # makefile but the argument can be passed to make if needed.
 603 #
 604
 605 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 606 export MODLIB
 607
 608 strip-symbols := $(srctree)/scripts/strip-symbols \
 609                  $(wildcard $(srctree)/arch/$(ARCH)/scripts/strip-symbols)
 610
 611 #
 612 # INSTALL_MOD_STRIP, if defined, will cause modules to be stripped while
 613 # they get installed.  If INSTALL_MOD_STRIP is '1', then the default
 614 # options (see below) will be used.  Otherwise, INSTALL_MOD_STRIP will
 615 # be used as the option(s) to the objcopy command.
 616 ifdef INSTALL_MOD_STRIP
 617 ifeq ($(INSTALL_MOD_STRIP),1)
 618 mod_strip_cmd = $(OBJCOPY) --strip-debug
 619 ifeq ($(CONFIG_KALLSYMS_ALL),$(CONFIG_KALLSYMS_STRIP_GENERATED))
 620 mod_strip_cmd += --wildcard $(addprefix --strip-symbols ,$(strip-symbols))
 621 endif
 622 else
 623 mod_strip_cmd = $(OBJCOPY) $(INSTALL_MOD_STRIP)
 624 endif # INSTALL_MOD_STRIP=1
 625 else
 626 mod_strip_cmd = false
 627 endif # INSTALL_MOD_STRIP
 628 export mod_strip_cmd
 629
 630
 631 ifeq ($(KBUILD_EXTMOD),)
 632 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 633
 634 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 635                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 636                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 637
 638 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 639                      $(init-n) $(init-) \
 640                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 641                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 642
 643 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 644 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 645 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 646 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 647 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 648 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 649 libs-y          := $(libs-y1) $(libs-y2)
 650
 651 # Build vmlinux
 652 # ---------------------------------------------------------------------------
 653 # vmlinux is built from the objects selected by $(vmlinux-init) and
 654 # $(vmlinux-main). Most are built-in.o files from top-level directories
 655 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 656 # Ordering when linking is important, and $(vmlinux-init) must be first.
 657 #
 658 # vmlinux
 659 #   ^
 660 #   |
 661 #   +-< $(vmlinux-init)
 662 #   |   +--< init/version.o + more
 663 #   |
 664 #   +--< $(vmlinux-main)
 665 #   |    +--< driver/built-in.o mm/built-in.o + more
 666 #   |
 667 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 668 #
 669 # vmlinux version (uname -v) cannot be updated during normal
 670 # descending-into-subdirs phase since we do not yet know if we need to
 671 # update vmlinux.
 672 # Therefore this step is delayed until just before final link of vmlinux -
 673 # except in the kallsyms case where it is done just before adding the
 674 # symbols to the kernel.
 675 #
 676 # System.map is generated to document addresses of all kernel symbols
 677
 678 vmlinux-init := $(head-y) $(init-y)
 679 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 680 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 681 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 682 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 683
 684 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 685 # May be overridden by arch/$(ARCH)/Makefile
 686 quiet_cmd_vmlinux__ ?= LD      $@
 687       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 688       -T $(vmlinux-lds) $(vmlinux-init)                          \
 689       --start-group $(vmlinux-main) --end-group                  \
 690       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 691
 692 # Generate new vmlinux version
 693 quiet_cmd_vmlinux_version = GEN     .version
 694       cmd_vmlinux_version = set -e;                     \
 695         if [ ! -r .version ]; then                      \
 696           rm -f .version;                               \
 697           echo 1 >.version;                             \
 698         else                                            \
 699           mv .version .old_version;                     \
 700           expr 0$$(cat .old_version) + 1 >.version;     \
 701         fi;                                             \
 702         $(MAKE) $(build)=init
 703
 704 # Generate System.map
 705 quiet_cmd_sysmap = SYSMAP
 706       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 707
 708 # Link of vmlinux
 709 # If CONFIG_KALLSYMS is set .version is already updated
 710 # Generate System.map and verify that the content is consistent
 711 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 712 # First command is ':' to allow us to use + in front of the rule
 713 define rule_vmlinux__
 714         :
 715         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 716
 717         $(call cmd,vmlinux__)
 718         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 719
 720         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 721           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 722         $(cmd_sysmap) $@ System.map;                                         \
 723         if [ $$? -ne 0 ]; then                                               \
 724                 rm -f $@;                                                    \
 725                 /bin/false;                                                  \
 726         fi;
 727         $(verify_kallsyms)
 728 endef
 729
 730
 731 ifdef CONFIG_KALLSYMS
 732 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 733 # It's a three stage process:
 734 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 735 #   empty
 736 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 737 #   the right size - vmlinux version (uname -v) is updated during this step
 738 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 739 #   but due to the added section, some addresses have shifted.
 740 #   From here, we generate a correct .tmp_kallsyms2.o
 741 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 742 # o Verify that the System.map from vmlinux matches the map from
 743 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 744 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 745 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 746 #   temporary bypass to allow the kernel to be built while the
 747 #   maintainers work out what went wrong with kallsyms.
 748
 749 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 750 last_kallsyms := 3
 751 else
 752 last_kallsyms := 2
 753 endif
 754
 755 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 756 kallsyms.h := $(wildcard include/config/kallsyms/*.h) $(wildcard include/config/kallsyms/*/*.h)
 757
 758 define verify_kallsyms
 759         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 760           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 761           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 762         $(Q)cmp -s System.map .tmp_System.map ||                             \
 763                 (echo Inconsistent kallsyms data;                            \
 764                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 765                  rm .tmp_kallsyms* ; /bin/false )
 766 endef
 767
 768 # Update vmlinux version before link
 769 # Use + in front of this rule to silent warning about make -j1
 770 # First command is ':' to allow us to use + in front of this rule
 771 cmd_ksym_ld = $(cmd_vmlinux__)
 772 define rule_ksym_ld
 773         :
 774         +$(call cmd,vmlinux_version)
 775         $(call cmd,vmlinux__)
 776         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 777 endef
 778
 779 # Generate .S file with all kernel symbols
 780 quiet_cmd_kallsyms = KSYM    $@
 781       cmd_kallsyms = { test $* -eq 0 || $(NM) -n $<; } \
 782                      | $(KALLSYMS) $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) >$@
 783
 784 quiet_cmd_kstrip = STRIP   $@
 785       cmd_kstrip = $(OBJCOPY) --wildcard $(addprefix --strip$(if $(CONFIG_RELOCATABLE),-unneeded)-symbols ,$(filter %/scripts/strip-symbols,$^)) $< $@
 786
 787 $(foreach n,0 1 2 3,.tmp_kallsyms$(n).o): KBUILD_AFLAGS += -Wa,--strip-local-absolute
 788 $(foreach n,0 1 2 3,.tmp_kallsyms$(n).o): %.o: %.S scripts FORCE
 789         $(call if_changed_dep,as_o_S)
 790
 791 ifeq ($(CONFIG_KALLSYMS_STRIP_GENERATED),y)
 792 strip-ext := .stripped
 793 endif
 794
 795 .tmp_kallsyms%.S: .tmp_vmlinux%$(strip-ext) $(KALLSYMS) $(kallsyms.h)
 796         $(call cmd,kallsyms)
 797
 798 # make -jN seems to have problems with intermediate files, see bug #3330.
 799 .SECONDARY: $(foreach n,1 2 3,.tmp_vmlinux$(n).stripped)
 800 .tmp_vmlinux%.stripped: .tmp_vmlinux% $(strip-symbols) $(kallsyms.h)
 801         $(call cmd,kstrip)
 802
 803 ifneq ($(CONFIG_DEBUG_INFO),y)
 804 .tmp_vmlinux%: LDFLAGS_vmlinux += -S
 805 endif
 806 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 807 .tmp_vmlinux%: $(vmlinux-lds) $(vmlinux-all) FORCE
 808         $(if $(filter 1,$*),$(call if_changed_rule,ksym_ld),$(call if_changed,vmlinux__))
 809
 810 .tmp_vmlinux0$(strip-ext):
 811         $(Q)echo "placeholder" >$@
 812
 813 .tmp_vmlinux1: .tmp_kallsyms0.o
 814 .tmp_vmlinux2: .tmp_kallsyms1.o
 815 .tmp_vmlinux3: .tmp_kallsyms2.o
 816
 817 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 818 $(KALLSYMS): scripts ;
 819
 820 # Generate some data for debugging strange kallsyms problems
 821 debug_kallsyms: .tmp_map$(last_kallsyms)
 822
 823 .tmp_map%: .tmp_vmlinux% FORCE
 824         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 825
 826 .tmp_map3: .tmp_map2
 827
 828 .tmp_map2: .tmp_map1
 829
 830 endif # ifdef CONFIG_KALLSYMS
 831
 832 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 833 # relevant sections renamed as per the linker script.
 834 quiet_cmd_vmlinux-modpost = LD      $@
 835       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 836          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 837          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 838 define rule_vmlinux-modpost
 839         :
 840         +$(call cmd,vmlinux-modpost)
 841         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 842         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 843 endef
 844
 845 # vmlinux image - including updated kernel symbols
 846 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 847 ifdef CONFIG_HEADERS_CHECK
 848         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 849 endif
 850 ifdef CONFIG_SAMPLES
 851         $(Q)$(MAKE) $(build)=samples
 852 endif
 853 ifdef CONFIG_BUILD_DOCSRC
 854         $(Q)$(MAKE) $(build)=Documentation
 855 endif
 856         $(call vmlinux-modpost)
 857         $(call if_changed_rule,vmlinux__)
 858         $(Q)rm -f .old_version
 859
 860 # build vmlinux.o first to catch section mismatch errors early
 861 ifdef CONFIG_KALLSYMS
 862 .tmp_vmlinux1: vmlinux.o
 863 endif
 864
 865 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 866 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 867         $(call if_changed_rule,vmlinux-modpost)
 868
 869 # The actual objects are generated when descending,
 870 # make sure no implicit rule kicks in
 871 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 872
 873 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 874 # Preset locale variables to speed up the build process. Limit locale
 875 # tweaks to this spot to avoid wrong language settings when running
 876 # make menuconfig etc.
 877 # Error messages still appears in the original language
 878
 879 PHONY += $(vmlinux-dirs)
 880 $(vmlinux-dirs): prepare scripts
 881         $(Q)$(MAKE) $(build)=$@
 882
 883 # Build the kernel release string
 884 #
 885 # The KERNELRELEASE value built here is stored in the file
 886 # include/config/kernel.release, and is used when executing several
 887 # make targets, such as "make install" or "make modules_install."
 888 #
 889 # The eventual kernel release string consists of the following fields,
 890 # shown in a hierarchical format to show how smaller parts are concatenated
 891 # to form the larger and final value, with values coming from places like
 892 # the Makefile, kernel config options, make command line options and/or
 893 # SCM tag information.
 894 #
 895 #       $(KERNELVERSION)
 896 #         $(VERSION)                    eg, 2
 897 #         $(PATCHLEVEL)                 eg, 6
 898 #         $(SUBLEVEL)                   eg, 18
 899 #         $(EXTRAVERSION)               eg, -rc6
 900 #       $(localver-full)
 901 #         $(localver)
 902 #           localversion*               (files without backups, containing '~')
 903 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 904 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 905 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 906 #           $(LOCALVERSION)             (from make command line if provided)
 907 #
 908 #  Note how the final $(localver-auto) string is included *only* if the
 909 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 910 # moment, only git is supported but other SCMs can edit the script
 911 # scripts/setlocalversion and add the appropriate checks as needed.
 912
 913 pattern = ".*/localversion[^~]*"
 914 string  = $(shell cat /dev/null \
 915            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 916
 917 localver = $(subst $(space),, $(string) \
 918                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 919
 920 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 921 # and if the SCM is know a tag from the SCM is appended.
 922 # The appended tag is determined by the SCM used.
 923 #
 924 # Currently, only git is supported.
 925 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 926 # checks as needed.
 927 ifdef CONFIG_LOCALVERSION_AUTO
 928         _localver-auto = $(shell $(CONFIG_SHELL) \
 929                           $(srctree)/scripts/setlocalversion $(srctree))
 930         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 931 endif
 932
 933 localver-full = $(localver)$(localver-auto)
 934
 935 # Store (new) KERNELRELASE string in include/config/kernel.release
 936 kernelrelease = $(KERNELVERSION)$(localver-full)
 937 include/config/kernel.release: include/config/auto.conf FORCE
 938         $(Q)rm -f $@
 939         $(Q)echo $(kernelrelease) > $@
 940
 941
 942 # Things we need to do before we recursively start building the kernel
 943 # or the modules are listed in "prepare".
 944 # A multi level approach is used. prepareN is processed before prepareN-1.
 945 # archprepare is used in arch Makefiles and when processed asm symlink,
 946 # version.h and scripts_basic is processed / created.
 947
 948 # Listed in dependency order
 949 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 950
 951 # prepare3 is used to check if we are building in a separate output directory,
 952 # and if so do:
 953 # 1) Check that make has not been executed in the kernel src $(srctree)
 954 # 2) Create the include2 directory, used for the second asm symlink
 955 prepare3: include/config/kernel.release
 956 ifneq ($(KBUILD_SRC),)
 957         @$(kecho) '  Using $(srctree) as source for kernel'
 958         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 959                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 960                 echo "  in the '$(srctree)' directory.";\
 961                 /bin/false; \
 962         fi;
 963         $(Q)if [ ! -d include2 ]; then                                  \
 964             mkdir -p include2;                                          \
 965             ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 966         fi
 967 endif
 968
 969 # prepare2 creates a makefile if using a separate output directory
 970 prepare2: prepare3 outputmakefile
 971
 972 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 973                    include/asm include/config/auto.conf
 974         $(cmd_crmodverdir)
 975
 976 archprepare: prepare1 scripts_basic
 977
 978 prepare0: archprepare FORCE
 979         $(Q)$(MAKE) $(build)=.
 980         $(Q)$(MAKE) $(build)=. missing-syscalls
 981
 982 # All the preparing..
 983 prepare: prepare0
 984
 985 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 986 # done in arch/$(ARCH)/kernel/Makefile
 987
 988 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 989
 990 # The asm symlink changes when $(ARCH) changes.
 991 # Detect this and ask user to run make mrproper
 992 # If asm is a stale symlink (point to dir that does not exist) remove it
 993 define check-symlink
 994         set -e;                                                            \
 995         if [ -L include/asm ]; then                                        \
 996                 asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
 997                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
 998                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 999                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
1000                         exit 1;                                            \
1001                 fi;                                                        \
1002                 test -e $$asmlink || rm include/asm;                       \
1003         elif [ -d include/asm ]; then                                      \
1004                 echo "ERROR: $@ is a directory but a symlink was expected";\
1005                 exit 1;                                                    \
1006         fi
1007 endef
1008
1009 # We create the target directory of the symlink if it does
1010 # not exist so the test in chack-symlink works and we have a
1011 # directory for generated filesas used by some architectures.
1012 define create-symlink
1013         if [ ! -L include/asm ]; then                                      \
1014                         $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1015                         if [ ! -d include/asm-$(SRCARCH) ]; then           \
1016                                 mkdir -p include/asm-$(SRCARCH);           \
1017                         fi;                                                \
1018                         ln -fsn asm-$(SRCARCH) $@;                         \
1019         fi
1020 endef
1021
1022 include/asm: FORCE
1023         $(Q)$(check-symlink)
1024         $(Q)$(create-symlink)
1025
1026 # Generate some files
1027 # ---------------------------------------------------------------------------
1028
1029 # KERNELRELEASE can change from a few different places, meaning version.h
1030 # needs to be updated, so this check is forced on all builds
1031
1032 uts_len := 64
1033 define filechk_utsrelease.h
1034         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1035           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1036           exit 1;                                                         \
1037         fi;                                                               \
1038         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1039 endef
1040
1041 define filechk_version.h
1042         (echo \#define LINUX_VERSION_CODE $(shell                             \
1043         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1044         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1045 endef
1046
1047 include/linux/version.h: $(srctree)/Makefile FORCE
1048         $(call filechk,version.h)
1049
1050 include/linux/utsrelease.h: include/config/kernel.release FORCE
1051         $(call filechk,utsrelease.h)
1052
1053 PHONY += headerdep
1054 headerdep:
1055         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1056
1057 # ---------------------------------------------------------------------------
1058
1059 PHONY += depend dep
1060 depend dep:
1061         @echo '*** Warning: make $@ is unnecessary now.'
1062
1063 # ---------------------------------------------------------------------------
1064 # Firmware install
1065 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1066 export INSTALL_FW_PATH
1067
1068 PHONY += firmware_install
1069 firmware_install: FORCE
1070         @mkdir -p $(objtree)/firmware
1071         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1072
1073 # ---------------------------------------------------------------------------
1074 # Kernel headers
1075
1076 #Default location for installed headers
1077 export INSTALL_HDR_PATH = $(objtree)/usr
1078
1079 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1080 # Find out where the Kbuild file is located to support
1081 # arch/$(ARCH)/include/asm
1082 hdr-dir = $(strip                                                         \
1083           $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1084                arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1085
1086 # If we do an all arch process set dst to asm-$(hdr-arch)
1087 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1088
1089 PHONY += __headers
1090 __headers: include/linux/version.h scripts_basic FORCE
1091         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1092
1093 PHONY += headers_install_all
1094 headers_install_all:
1095         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1096
1097 PHONY += headers_install
1098 headers_install: __headers
1099         $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1100         $(error Headers not exportable for the $(SRCARCH) architecture))
1101         $(Q)$(MAKE) $(hdr-inst)=include
1102         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1103
1104 PHONY += headers_check_all
1105 headers_check_all: headers_install_all
1106         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1107
1108 PHONY += headers_check
1109 headers_check: headers_install
1110         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1111         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1112
1113 # ---------------------------------------------------------------------------
1114 # Modules
1115
1116 ifdef CONFIG_MODULES
1117
1118 # By default, build modules as well
1119
1120 all: modules
1121
1122 #       Build modules
1123 #
1124 #       A module can be listed more than once in obj-m resulting in
1125 #       duplicate lines in modules.order files.  Those are removed
1126 #       using awk while concatenating to the final file.
1127
1128 PHONY += modules
1129 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1130         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1131         @$(kecho) '  Building modules, stage 2.';
1132         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1133         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1134
1135
1136 # Target to prepare building external modules
1137 PHONY += modules_prepare
1138 modules_prepare: prepare scripts
1139
1140 # Target to install modules
1141 PHONY += modules_install
1142 modules_install: _modinst_ _modinst_post
1143
1144 PHONY += _modinst_
1145 _modinst_:
1146         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1147                 echo "Warning: you may need to install module-init-tools"; \
1148                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1149                 sleep 1; \
1150         fi
1151         @rm -rf $(MODLIB)/kernel
1152         @rm -f $(MODLIB)/source
1153         @mkdir -p $(MODLIB)/kernel
1154         @ln -s $(srctree) $(MODLIB)/source
1155         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1156                 rm -f $(MODLIB)/build ; \
1157                 ln -s $(objtree) $(MODLIB)/build ; \
1158         fi
1159         @cp -f $(objtree)/modules.order $(MODLIB)/
1160         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1161
1162 # This depmod is only for convenience to give the initial
1163 # boot a modules.dep even before / is mounted read-write.  However the
1164 # boot script depmod is the master version.
1165 PHONY += _modinst_post
1166 _modinst_post: _modinst_
1167         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1168         $(call cmd,depmod)
1169
1170 else # CONFIG_MODULES
1171
1172 # Modules not configured
1173 # ---------------------------------------------------------------------------
1174
1175 modules modules_install: FORCE
1176         @echo
1177         @echo "The present kernel configuration has modules disabled."
1178         @echo "Type 'make config' and enable loadable module support."
1179         @echo "Then build a kernel with module support enabled."
1180         @echo
1181         @exit 1
1182
1183 endif # CONFIG_MODULES
1184
1185 ###
1186 # Cleaning is done on three levels.
1187 # make clean     Delete most generated files
1188 #                Leave enough to build external modules
1189 # make mrproper  Delete the current configuration, and all generated files
1190 # make distclean Remove editor backup files, patch leftover files and the like
1191
1192 # Directories & files removed with 'make clean'
1193 CLEAN_DIRS  += $(MODVERDIR)
1194 CLEAN_FILES +=  vmlinux System.map \
1195                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1196
1197 # Directories & files removed with 'make mrproper'
1198 MRPROPER_DIRS  += include/config include2 usr/include
1199 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1200                   include/linux/autoconf.h include/linux/version.h      \
1201                   include/linux/utsrelease.h                            \
1202                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1203                   Module.symvers Module.markers tags TAGS cscope*
1204
1205 # clean - Delete most, but leave enough to build external modules
1206 #
1207 clean: rm-dirs  := $(CLEAN_DIRS)
1208 clean: rm-files := $(CLEAN_FILES)
1209 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1210
1211 PHONY += $(clean-dirs) clean archclean
1212 $(clean-dirs):
1213         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1214
1215 clean: archclean $(clean-dirs)
1216         $(call cmd,rmdirs)
1217         $(call cmd,rmfiles)
1218         @find . $(RCS_FIND_IGNORE) \
1219                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1220                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1221                 -o -name '*.symtypes' -o -name 'modules.order' \
1222                 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1223                 -type f -print | xargs rm -f
1224
1225 # mrproper - Delete all generated files, including .config
1226 #
1227 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1228 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1229 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1230
1231 PHONY += $(mrproper-dirs) mrproper archmrproper
1232 $(mrproper-dirs):
1233         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1234
1235 mrproper: clean archmrproper $(mrproper-dirs)
1236         $(call cmd,rmdirs)
1237         $(call cmd,rmfiles)
1238
1239 # distclean
1240 #
1241 PHONY += distclean
1242
1243 distclean: mrproper
1244         @find $(srctree) $(RCS_FIND_IGNORE) \
1245                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1246                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1247                 -o -name '.*.rej' -o -size 0 \
1248                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1249                 -type f -print | xargs rm -f
1250
1251
1252 # Packaging of the kernel to various formats
1253 # ---------------------------------------------------------------------------
1254 # rpm target kept for backward compatibility
1255 package-dir     := $(srctree)/scripts/package
1256
1257 %pkg: include/config/kernel.release FORCE
1258         $(Q)$(MAKE) $(build)=$(package-dir) $@
1259 rpm: include/config/kernel.release FORCE
1260         $(Q)$(MAKE) $(build)=$(package-dir) $@
1261
1262
1263 # Brief documentation of the typical targets used
1264 # ---------------------------------------------------------------------------
1265
1266 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1267 boards := $(notdir $(boards))
1268 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1269 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1270
1271 help:
1272         @echo  'Cleaning targets:'
1273         @echo  '  clean           - Remove most generated files but keep the config and'
1274         @echo  '                    enough build support to build external modules'
1275         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1276         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1277         @echo  ''
1278         @echo  'Configuration targets:'
1279         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1280         @echo  ''
1281         @echo  'Other generic targets:'
1282         @echo  '  all             - Build all targets marked with [*]'
1283         @echo  '* vmlinux         - Build the bare kernel'
1284         @echo  '* modules         - Build all modules'
1285         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1286         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1287         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1288         @echo  '  dir/            - Build all files in dir and below'
1289         @echo  '  dir/file.[ois]  - Build specified target only'
1290         @echo  '  dir/file.ko     - Build module including final link'
1291         @echo  '  prepare         - Set up for building external modules'
1292         @echo  '  tags/TAGS       - Generate tags file for editors'
1293         @echo  '  cscope          - Generate cscope index'
1294         @echo  '  kernelrelease   - Output the release version string'
1295         @echo  '  kernelversion   - Output the version stored in Makefile'
1296         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1297          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1298          echo  ''
1299         @echo  'Static analysers'
1300         @echo  '  checkstack      - Generate a list of stack hogs'
1301         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1302         @echo  '  versioncheck    - Sanity check on version.h usage'
1303         @echo  '  includecheck    - Check for duplicate included header files'
1304         @echo  '  export_report   - List the usages of all exported symbols'
1305         @echo  '  headers_check   - Sanity check on exported headers'
1306         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1307          echo  ''
1308         @echo  'Kernel packaging:'
1309         @$(MAKE) $(build)=$(package-dir) help
1310         @echo  ''
1311         @echo  'Documentation targets:'
1312         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1313         @echo  ''
1314         @echo  'Architecture specific targets ($(SRCARCH)):'
1315         @$(if $(archhelp),$(archhelp),\
1316                 echo '  No architecture specific help defined for $(SRCARCH)')
1317         @echo  ''
1318         @$(if $(boards), \
1319                 $(foreach b, $(boards), \
1320                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1321                 echo '')
1322         @$(if $(board-dirs), \
1323                 $(foreach b, $(board-dirs), \
1324                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1325                 printf "  %-16s - Show all of the above\\n" help-boards; \
1326                 echo '')
1327
1328         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1329         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1330         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1331         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1332         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1333         @echo  ''
1334         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1335         @echo  'For further info see the ./README file'
1336
1337
1338 help-board-dirs := $(addprefix help-,$(board-dirs))
1339
1340 help-boards: $(help-board-dirs)
1341
1342 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1343
1344 $(help-board-dirs): help-%:
1345         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1346         @$(if $(boards-per-dir), \
1347                 $(foreach b, $(boards-per-dir), \
1348                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1349                 echo '')
1350
1351
1352 # Documentation targets
1353 # ---------------------------------------------------------------------------
1354 %docs: scripts_basic FORCE
1355         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1356
1357 else # KBUILD_EXTMOD
1358
1359 ###
1360 # External module support.
1361 # When building external modules the kernel used as basis is considered
1362 # read-only, and no consistency checks are made and the make
1363 # system is not used on the basis kernel. If updates are required
1364 # in the basis kernel ordinary make commands (without M=...) must
1365 # be used.
1366 #
1367 # The following are the only valid targets when building external
1368 # modules.
1369 # make M=dir clean     Delete all automatically generated files
1370 # make M=dir modules   Make all modules in specified dir
1371 # make M=dir           Same as 'make M=dir modules'
1372 # make M=dir modules_install
1373 #                      Install the modules built in the module directory
1374 #                      Assumes install directory is already created
1375
1376 # We are always building modules
1377 KBUILD_MODULES := 1
1378 PHONY += crmodverdir
1379 crmodverdir:
1380         $(cmd_crmodverdir)
1381
1382 PHONY += $(objtree)/Module.symvers
1383 $(objtree)/Module.symvers:
1384         @test -e $(objtree)/Module.symvers || ( \
1385         echo; \
1386         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1387         echo "           is missing; modules will have no dependencies and modversions."; \
1388         echo )
1389
1390 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1391 PHONY += $(module-dirs) modules
1392 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1393         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1394
1395 modules: $(module-dirs)
1396         @$(kecho) '  Building modules, stage 2.';
1397         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1398
1399 PHONY += modules_install
1400 modules_install: _emodinst_ _emodinst_post
1401
1402 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1403 PHONY += _emodinst_
1404 _emodinst_:
1405         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1406         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1407
1408 PHONY += _emodinst_post
1409 _emodinst_post: _emodinst_
1410         $(call cmd,depmod)
1411
1412 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1413
1414 PHONY += $(clean-dirs) clean
1415 $(clean-dirs):
1416         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1417
1418 clean:  rm-dirs := $(MODVERDIR)
1419 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1420 clean: $(clean-dirs)
1421         $(call cmd,rmdirs)
1422         $(call cmd,rmfiles)
1423         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1424                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1425                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1426                 -type f -print | xargs rm -f
1427
1428 help:
1429         @echo  '  Building external modules.'
1430         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1431         @echo  ''
1432         @echo  '  modules         - default target, build the module(s)'
1433         @echo  '  modules_install - install the module'
1434         @echo  '  clean           - remove generated files in module directory only'
1435         @echo  ''
1436
1437 # Dummies...
1438 PHONY += prepare scripts
1439 prepare: ;
1440 scripts: ;
1441 endif # KBUILD_EXTMOD
1442
1443 # Generate tags for editors
1444 # ---------------------------------------------------------------------------
1445 quiet_cmd_tags = GEN     $@
1446       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1447
1448 tags TAGS cscope: FORCE
1449         $(call cmd,tags)
1450
1451 # Scripts to check various things for consistency
1452 # ---------------------------------------------------------------------------
1453
1454 includecheck:
1455         find * $(RCS_FIND_IGNORE) \
1456                 -name '*.[hcS]' -type f -print | sort \
1457                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1458
1459 versioncheck:
1460         find * $(RCS_FIND_IGNORE) \
1461                 -name '*.[hcS]' -type f -print | sort \
1462                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1463
1464 namespacecheck:
1465         $(PERL) $(srctree)/scripts/namespace.pl
1466
1467 export_report:
1468         $(PERL) $(srctree)/scripts/export_report.pl
1469
1470 endif #ifeq ($(config-targets),1)
1471 endif #ifeq ($(mixed-targets),1)
1472
1473 PHONY += checkstack kernelrelease kernelversion
1474
1475 # UML needs a little special treatment here.  It wants to use the host
1476 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1477 # else wants $(ARCH), including people doing cross-builds, which means
1478 # that $(SUBARCH) doesn't work here.
1479 ifeq ($(ARCH), um)
1480 CHECKSTACK_ARCH := $(SUBARCH)
1481 else
1482 CHECKSTACK_ARCH := $(ARCH)
1483 endif
1484 checkstack:
1485         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1486         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1487
1488 kernelrelease:
1489         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1490         $(error kernelrelease not valid - run 'make prepare' to update it))
1491 kernelversion:
1492         @echo $(KERNELVERSION)
1493
1494 # Single targets
1495 # ---------------------------------------------------------------------------
1496 # Single targets are compatible with:
1497 # - build with mixed source and output
1498 # - build with separate output dir 'make O=...'
1499 # - external modules
1500 #
1501 #  target-dir => where to store outputfile
1502 #  build-dir  => directory in kernel source tree to use
1503
1504 ifeq ($(KBUILD_EXTMOD),)
1505         build-dir  = $(patsubst %/,%,$(dir $@))
1506         target-dir = $(dir $@)
1507 else
1508         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1509         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1510         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1511 endif
1512
1513 %.s: %.c prepare scripts FORCE
1514         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1515 %.i: %.c prepare scripts FORCE
1516         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1517 %.o: %.c prepare scripts FORCE
1518         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1519 %.lst: %.c prepare scripts FORCE
1520         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1521 %.s: %.S prepare scripts FORCE
1522         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523 %.o: %.S prepare scripts FORCE
1524         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525 %.symtypes: %.c prepare scripts FORCE
1526         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527
1528 # Modules
1529 /: prepare scripts FORCE
1530         $(cmd_crmodverdir)
1531         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1532         $(build)=$(build-dir)
1533 %/: prepare scripts FORCE
1534         $(cmd_crmodverdir)
1535         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1536         $(build)=$(build-dir)
1537 %.ko: prepare scripts FORCE
1538         $(cmd_crmodverdir)
1539         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1540         $(build)=$(build-dir) $(@:.ko=.o)
1541         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1542
1543 # FIXME Should go into a make.lib or something
1544 # ===========================================================================
1545
1546 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1547       cmd_rmdirs = rm -rf $(rm-dirs)
1548
1549 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1550       cmd_rmfiles = rm -f $(rm-files)
1551
1552 # Run depmod only if we have System.map and depmod is executable
1553 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1554       cmd_depmod = \
1555         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1556                 $(DEPMOD) -ae -F System.map                                     \
1557                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1558                 $(KERNELRELEASE);                                               \
1559         fi
1560
1561 # Create temporary dir for module support files
1562 # clean it up only when building all modules
1563 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1564                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1565
1566 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1567           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1568           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1569
1570 quiet_cmd_as_o_S = AS      $@
1571 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1572
1573 # read all saved command lines
1574
1575 targets := $(wildcard $(sort $(targets)))
1576 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1577
1578 ifneq ($(cmd_files),)
1579   $(cmd_files): ;       # Do not try to update included dependency files
1580   include $(cmd_files)
1581 endif
1582
1583 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1584 # Usage:
1585 # $(Q)$(MAKE) $(clean)=dir
1586 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1587
1588 endif   # skip-makefile
1589
1590 PHONY += FORCE
1591 FORCE:
1592
1593 # Declare the contents of the .PHONY variable as phony.  We keep that
1594 # information in a variable se we can use it in if_changed and friends.
1595 .PHONY: $(PHONY)