Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 29
   4 EXTRAVERSION = -rc2
   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__ \
 325                   -Wbitwise -Wno-return-void $(CF)
 326 MODFLAGS        = -DMODULE
 327 CFLAGS_MODULE   = $(MODFLAGS)
 328 AFLAGS_MODULE   = $(MODFLAGS)
 329 LDFLAGS_MODULE  =
 330 CFLAGS_KERNEL   =
 331 AFLAGS_KERNEL   =
 332
 333
 334 # Use LINUXINCLUDE when you must reference the include/ directory.
 335 # Needed to be compatible with the O= option
 336 LINUXINCLUDE    := -Iinclude \
 337                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 338                    -I$(srctree)/arch/$(hdr-arch)/include               \
 339                    -include include/linux/autoconf.h
 340
 341 KBUILD_CPPFLAGS := -D__KERNEL__
 342
 343 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 344                    -fno-strict-aliasing -fno-common \
 345                    -Werror-implicit-function-declaration
 346 KBUILD_AFLAGS   := -D__ASSEMBLY__
 347
 348 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 349 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 350 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 351
 352 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 353 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 354 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 355 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 356
 357 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 358 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 359 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 360
 361 # When compiling out-of-tree modules, put MODVERDIR in the module
 362 # tree rather than in the kernel tree. The kernel tree might
 363 # even be read-only.
 364 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 365
 366 # Files to ignore in find ... statements
 367
 368 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
 369 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 370
 371 # ===========================================================================
 372 # Rules shared between *config targets and build targets
 373
 374 # Basic helpers built in scripts/
 375 PHONY += scripts_basic
 376 scripts_basic:
 377         $(Q)$(MAKE) $(build)=scripts/basic
 378
 379 # To avoid any implicit rule to kick in, define an empty command.
 380 scripts/basic/%: scripts_basic ;
 381
 382 PHONY += outputmakefile
 383 # outputmakefile generates a Makefile in the output directory, if using a
 384 # separate output directory. This allows convenient use of make in the
 385 # output directory.
 386 outputmakefile:
 387 ifneq ($(KBUILD_SRC),)
 388         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 389             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 390 endif
 391
 392 # To make sure we do not include .config for any of the *config targets
 393 # catch them early, and hand them over to scripts/kconfig/Makefile
 394 # It is allowed to specify more targets when calling make, including
 395 # mixing *config targets and build targets.
 396 # For example 'make oldconfig all'.
 397 # Detect when mixed targets is specified, and make a second invocation
 398 # of make so .config is not included in this case either (for *config).
 399
 400 no-dot-config-targets := clean mrproper distclean \
 401                          cscope TAGS tags help %docs check% \
 402                          include/linux/version.h headers_% \
 403                          kernelrelease kernelversion
 404
 405 config-targets := 0
 406 mixed-targets  := 0
 407 dot-config     := 1
 408
 409 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 410         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 411                 dot-config := 0
 412         endif
 413 endif
 414
 415 ifeq ($(KBUILD_EXTMOD),)
 416         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 417                 config-targets := 1
 418                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 419                         mixed-targets := 1
 420                 endif
 421         endif
 422 endif
 423
 424 ifeq ($(mixed-targets),1)
 425 # ===========================================================================
 426 # We're called with mixed targets (*config and build targets).
 427 # Handle them one by one.
 428
 429 %:: FORCE
 430         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 431
 432 else
 433 ifeq ($(config-targets),1)
 434 # ===========================================================================
 435 # *config targets only - make sure prerequisites are updated, and descend
 436 # in scripts/kconfig to make the *config target
 437
 438 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 439 # KBUILD_DEFCONFIG may point out an alternative default configuration
 440 # used for 'make defconfig'
 441 include $(srctree)/arch/$(SRCARCH)/Makefile
 442 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 443
 444 config: scripts_basic outputmakefile FORCE
 445         $(Q)mkdir -p include/linux include/config
 446         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 447
 448 %config: scripts_basic outputmakefile FORCE
 449         $(Q)mkdir -p include/linux include/config
 450         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 451
 452 else
 453 # ===========================================================================
 454 # Build targets only - this includes vmlinux, arch specific targets, clean
 455 # targets and others. In general all targets except *config targets.
 456
 457 ifeq ($(KBUILD_EXTMOD),)
 458 # Additional helpers built in scripts/
 459 # Carefully list dependencies so we do not try to build scripts twice
 460 # in parallel
 461 PHONY += scripts
 462 scripts: scripts_basic include/config/auto.conf
 463         $(Q)$(MAKE) $(build)=$(@)
 464
 465 # Objects we will link into vmlinux / subdirs we need to visit
 466 init-y          := init/
 467 drivers-y       := drivers/ sound/ firmware/
 468 net-y           := net/
 469 libs-y          := lib/
 470 core-y          := usr/
 471 endif # KBUILD_EXTMOD
 472
 473 ifeq ($(dot-config),1)
 474 # Read in config
 475 -include include/config/auto.conf
 476
 477 ifeq ($(KBUILD_EXTMOD),)
 478 # Read in dependencies to all Kconfig* files, make sure to run
 479 # oldconfig if changes are detected.
 480 -include include/config/auto.conf.cmd
 481
 482 # To avoid any implicit rule to kick in, define an empty command
 483 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 484
 485 # If .config is newer than include/config/auto.conf, someone tinkered
 486 # with it and forgot to run make oldconfig.
 487 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 488 # we execute the config step to be sure to catch updated Kconfig files
 489 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 490         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 491 else
 492 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 493 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 494 PHONY += include/config/auto.conf
 495
 496 include/config/auto.conf:
 497         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 498         echo;                                                           \
 499         echo "  ERROR: Kernel configuration is invalid.";               \
 500         echo "         include/linux/autoconf.h or $@ are missing.";    \
 501         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 502         echo;                                                           \
 503         /bin/false)
 504
 505 endif # KBUILD_EXTMOD
 506
 507 else
 508 # Dummy target needed, because used as prerequisite
 509 include/config/auto.conf: ;
 510 endif # $(dot-config)
 511
 512 # The all: target is the default when no target is given on the
 513 # command line.
 514 # This allow a user to issue only 'make' to build a kernel including modules
 515 # Defaults vmlinux but it is usually overridden in the arch makefile
 516 all: vmlinux
 517
 518 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 519 KBUILD_CFLAGS   += -Os
 520 else
 521 KBUILD_CFLAGS   += -O2
 522 endif
 523
 524 include $(srctree)/arch/$(SRCARCH)/Makefile
 525
 526 ifneq (CONFIG_FRAME_WARN,0)
 527 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 528 endif
 529
 530 # Force gcc to behave correct even for buggy distributions
 531 # Arch Makefiles may override this setting
 532 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 533
 534 ifdef CONFIG_FRAME_POINTER
 535 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 536 else
 537 KBUILD_CFLAGS   += -fomit-frame-pointer
 538 endif
 539
 540 ifdef CONFIG_DEBUG_INFO
 541 KBUILD_CFLAGS   += -g
 542 KBUILD_AFLAGS   += -gdwarf-2
 543 endif
 544
 545 ifdef CONFIG_FUNCTION_TRACER
 546 KBUILD_CFLAGS   += -pg
 547 endif
 548
 549 # We trigger additional mismatches with less inlining
 550 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 551 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 552 endif
 553
 554 # arch Makefile may override CC so keep this after arch Makefile is included
 555 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 556 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 557
 558 # warn about C99 declaration after statement
 559 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 560
 561 # disable pointer signed / unsigned warnings in gcc 4.0
 562 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 563
 564 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 565 # But warn user when we do so
 566 warn-assign = \
 567 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 568
 569 ifneq ($(KCPPFLAGS),)
 570         $(call warn-assign,CPPFLAGS)
 571         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 572 endif
 573 ifneq ($(KAFLAGS),)
 574         $(call warn-assign,AFLAGS)
 575         KBUILD_AFLAGS += $(KAFLAGS)
 576 endif
 577 ifneq ($(KCFLAGS),)
 578         $(call warn-assign,CFLAGS)
 579         KBUILD_CFLAGS += $(KCFLAGS)
 580 endif
 581
 582 # Use --build-id when available.
 583 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 584                               $(call ld-option, -Wl$(comma)--build-id,))
 585 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 586 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 587
 588 # Default kernel image to build when no specific target is given.
 589 # KBUILD_IMAGE may be overruled on the command line or
 590 # set in the environment
 591 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 592 # this default value
 593 export KBUILD_IMAGE ?= vmlinux
 594
 595 #
 596 # INSTALL_PATH specifies where to place the updated kernel and system map
 597 # images. Default is /boot, but you can set it to other values
 598 export  INSTALL_PATH ?= /boot
 599
 600 #
 601 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 602 # relocations required by build roots.  This is not defined in the
 603 # makefile but the argument can be passed to make if needed.
 604 #
 605
 606 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 607 export MODLIB
 608
 609 strip-symbols := $(srctree)/scripts/strip-symbols \
 610                  $(wildcard $(srctree)/arch/$(ARCH)/scripts/strip-symbols)
 611
 612 #
 613 # INSTALL_MOD_STRIP, if defined, will cause modules to be stripped while
 614 # they get installed.  If INSTALL_MOD_STRIP is '1', then the default
 615 # options (see below) will be used.  Otherwise, INSTALL_MOD_STRIP will
 616 # be used as the option(s) to the objcopy command.
 617 ifdef INSTALL_MOD_STRIP
 618 ifeq ($(INSTALL_MOD_STRIP),1)
 619 mod_strip_cmd = $(OBJCOPY) --strip-debug
 620 ifeq ($(CONFIG_KALLSYMS_ALL),$(CONFIG_KALLSYMS_STRIP_GENERATED))
 621 mod_strip_cmd += --wildcard $(addprefix --strip-symbols ,$(strip-symbols))
 622 endif
 623 else
 624 mod_strip_cmd = $(OBJCOPY) $(INSTALL_MOD_STRIP)
 625 endif # INSTALL_MOD_STRIP=1
 626 else
 627 mod_strip_cmd = false
 628 endif # INSTALL_MOD_STRIP
 629 export mod_strip_cmd
 630
 631
 632 ifeq ($(KBUILD_EXTMOD),)
 633 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 634
 635 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 636                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 637                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 638
 639 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 640                      $(init-n) $(init-) \
 641                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 642                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 643
 644 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 645 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 646 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 647 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 648 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 649 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 650 libs-y          := $(libs-y1) $(libs-y2)
 651
 652 # Build vmlinux
 653 # ---------------------------------------------------------------------------
 654 # vmlinux is built from the objects selected by $(vmlinux-init) and
 655 # $(vmlinux-main). Most are built-in.o files from top-level directories
 656 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 657 # Ordering when linking is important, and $(vmlinux-init) must be first.
 658 #
 659 # vmlinux
 660 #   ^
 661 #   |
 662 #   +-< $(vmlinux-init)
 663 #   |   +--< init/version.o + more
 664 #   |
 665 #   +--< $(vmlinux-main)
 666 #   |    +--< driver/built-in.o mm/built-in.o + more
 667 #   |
 668 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 669 #
 670 # vmlinux version (uname -v) cannot be updated during normal
 671 # descending-into-subdirs phase since we do not yet know if we need to
 672 # update vmlinux.
 673 # Therefore this step is delayed until just before final link of vmlinux -
 674 # except in the kallsyms case where it is done just before adding the
 675 # symbols to the kernel.
 676 #
 677 # System.map is generated to document addresses of all kernel symbols
 678
 679 vmlinux-init := $(head-y) $(init-y)
 680 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 681 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 682 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 683 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 684
 685 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 686 # May be overridden by arch/$(ARCH)/Makefile
 687 quiet_cmd_vmlinux__ ?= LD      $@
 688       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 689       -T $(vmlinux-lds) $(vmlinux-init)                          \
 690       --start-group $(vmlinux-main) --end-group                  \
 691       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 692
 693 # Generate new vmlinux version
 694 quiet_cmd_vmlinux_version = GEN     .version
 695       cmd_vmlinux_version = set -e;                     \
 696         if [ ! -r .version ]; then                      \
 697           rm -f .version;                               \
 698           echo 1 >.version;                             \
 699         else                                            \
 700           mv .version .old_version;                     \
 701           expr 0$$(cat .old_version) + 1 >.version;     \
 702         fi;                                             \
 703         $(MAKE) $(build)=init
 704
 705 # Generate System.map
 706 quiet_cmd_sysmap = SYSMAP
 707       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 708
 709 # Link of vmlinux
 710 # If CONFIG_KALLSYMS is set .version is already updated
 711 # Generate System.map and verify that the content is consistent
 712 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 713 # First command is ':' to allow us to use + in front of the rule
 714 define rule_vmlinux__
 715         :
 716         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 717
 718         $(call cmd,vmlinux__)
 719         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 720
 721         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 722           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 723         $(cmd_sysmap) $@ System.map;                                         \
 724         if [ $$? -ne 0 ]; then                                               \
 725                 rm -f $@;                                                    \
 726                 /bin/false;                                                  \
 727         fi;
 728         $(verify_kallsyms)
 729 endef
 730
 731
 732 ifdef CONFIG_KALLSYMS
 733 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 734 # It's a three stage process:
 735 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 736 #   empty
 737 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 738 #   the right size - vmlinux version (uname -v) is updated during this step
 739 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 740 #   but due to the added section, some addresses have shifted.
 741 #   From here, we generate a correct .tmp_kallsyms2.o
 742 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 743 # o Verify that the System.map from vmlinux matches the map from
 744 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 745 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 746 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 747 #   temporary bypass to allow the kernel to be built while the
 748 #   maintainers work out what went wrong with kallsyms.
 749
 750 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 751 last_kallsyms := 3
 752 else
 753 last_kallsyms := 2
 754 endif
 755
 756 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 757 kallsyms.h := $(wildcard include/config/kallsyms/*.h) $(wildcard include/config/kallsyms/*/*.h)
 758
 759 define verify_kallsyms
 760         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 761           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 762           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 763         $(Q)cmp -s System.map .tmp_System.map ||                             \
 764                 (echo Inconsistent kallsyms data;                            \
 765                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 766                  rm .tmp_kallsyms* ; /bin/false )
 767 endef
 768
 769 # Update vmlinux version before link
 770 # Use + in front of this rule to silent warning about make -j1
 771 # First command is ':' to allow us to use + in front of this rule
 772 cmd_ksym_ld = $(cmd_vmlinux__)
 773 define rule_ksym_ld
 774         :
 775         +$(call cmd,vmlinux_version)
 776         $(call cmd,vmlinux__)
 777         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 778 endef
 779
 780 # Generate .S file with all kernel symbols
 781 quiet_cmd_kallsyms = KSYM    $@
 782       cmd_kallsyms = { test $* -eq 0 || $(NM) -n $<; } \
 783                      | $(KALLSYMS) $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) >$@
 784
 785 quiet_cmd_kstrip = STRIP   $@
 786       cmd_kstrip = $(OBJCOPY) --wildcard $(addprefix --strip$(if $(CONFIG_RELOCATABLE),-unneeded)-symbols ,$(filter %/scripts/strip-symbols,$^)) $< $@
 787
 788 $(foreach n,0 1 2 3,.tmp_kallsyms$(n).o): KBUILD_AFLAGS += -Wa,--strip-local-absolute
 789 $(foreach n,0 1 2 3,.tmp_kallsyms$(n).o): %.o: %.S scripts FORCE
 790         $(call if_changed_dep,as_o_S)
 791
 792 ifeq ($(CONFIG_KALLSYMS_STRIP_GENERATED),y)
 793 strip-ext := .stripped
 794 endif
 795
 796 .tmp_kallsyms%.S: .tmp_vmlinux%$(strip-ext) $(KALLSYMS) $(kallsyms.h)
 797         $(call cmd,kallsyms)
 798
 799 # make -jN seems to have problems with intermediate files, see bug #3330.
 800 .SECONDARY: $(foreach n,1 2 3,.tmp_vmlinux$(n).stripped)
 801 .tmp_vmlinux%.stripped: .tmp_vmlinux% $(strip-symbols) $(kallsyms.h)
 802         $(call cmd,kstrip)
 803
 804 ifneq ($(CONFIG_DEBUG_INFO),y)
 805 .tmp_vmlinux%: LDFLAGS_vmlinux += -S
 806 endif
 807 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 808 .tmp_vmlinux%: $(vmlinux-lds) $(vmlinux-all) FORCE
 809         $(if $(filter 1,$*),$(call if_changed_rule,ksym_ld),$(call if_changed,vmlinux__))
 810
 811 .tmp_vmlinux0$(strip-ext):
 812         $(Q)echo "placeholder" >$@
 813
 814 .tmp_vmlinux1: .tmp_kallsyms0.o
 815 .tmp_vmlinux2: .tmp_kallsyms1.o
 816 .tmp_vmlinux3: .tmp_kallsyms2.o
 817
 818 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 819 $(KALLSYMS): scripts ;
 820
 821 # Generate some data for debugging strange kallsyms problems
 822 debug_kallsyms: .tmp_map$(last_kallsyms)
 823
 824 .tmp_map%: .tmp_vmlinux% FORCE
 825         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 826
 827 .tmp_map3: .tmp_map2
 828
 829 .tmp_map2: .tmp_map1
 830
 831 endif # ifdef CONFIG_KALLSYMS
 832
 833 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 834 # relevant sections renamed as per the linker script.
 835 quiet_cmd_vmlinux-modpost = LD      $@
 836       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 837          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 838          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 839 define rule_vmlinux-modpost
 840         :
 841         +$(call cmd,vmlinux-modpost)
 842         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 843         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 844 endef
 845
 846 # vmlinux image - including updated kernel symbols
 847 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 848 ifdef CONFIG_HEADERS_CHECK
 849         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 850 endif
 851 ifdef CONFIG_SAMPLES
 852         $(Q)$(MAKE) $(build)=samples
 853 endif
 854 ifdef CONFIG_BUILD_DOCSRC
 855         $(Q)$(MAKE) $(build)=Documentation
 856 endif
 857         $(call vmlinux-modpost)
 858         $(call if_changed_rule,vmlinux__)
 859         $(Q)rm -f .old_version
 860
 861 # build vmlinux.o first to catch section mismatch errors early
 862 ifdef CONFIG_KALLSYMS
 863 .tmp_vmlinux1: vmlinux.o
 864 endif
 865
 866 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 867 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 868         $(call if_changed_rule,vmlinux-modpost)
 869
 870 # The actual objects are generated when descending,
 871 # make sure no implicit rule kicks in
 872 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 873
 874 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 875 # Preset locale variables to speed up the build process. Limit locale
 876 # tweaks to this spot to avoid wrong language settings when running
 877 # make menuconfig etc.
 878 # Error messages still appears in the original language
 879
 880 PHONY += $(vmlinux-dirs)
 881 $(vmlinux-dirs): prepare scripts
 882         $(Q)$(MAKE) $(build)=$@
 883
 884 # Build the kernel release string
 885 #
 886 # The KERNELRELEASE value built here is stored in the file
 887 # include/config/kernel.release, and is used when executing several
 888 # make targets, such as "make install" or "make modules_install."
 889 #
 890 # The eventual kernel release string consists of the following fields,
 891 # shown in a hierarchical format to show how smaller parts are concatenated
 892 # to form the larger and final value, with values coming from places like
 893 # the Makefile, kernel config options, make command line options and/or
 894 # SCM tag information.
 895 #
 896 #       $(KERNELVERSION)
 897 #         $(VERSION)                    eg, 2
 898 #         $(PATCHLEVEL)                 eg, 6
 899 #         $(SUBLEVEL)                   eg, 18
 900 #         $(EXTRAVERSION)               eg, -rc6
 901 #       $(localver-full)
 902 #         $(localver)
 903 #           localversion*               (files without backups, containing '~')
 904 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 905 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 906 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 907 #           $(LOCALVERSION)             (from make command line if provided)
 908 #
 909 #  Note how the final $(localver-auto) string is included *only* if the
 910 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 911 # moment, only git is supported but other SCMs can edit the script
 912 # scripts/setlocalversion and add the appropriate checks as needed.
 913
 914 pattern = ".*/localversion[^~]*"
 915 string  = $(shell cat /dev/null \
 916            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 917
 918 localver = $(subst $(space),, $(string) \
 919                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 920
 921 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 922 # and if the SCM is know a tag from the SCM is appended.
 923 # The appended tag is determined by the SCM used.
 924 #
 925 # Currently, only git is supported.
 926 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 927 # checks as needed.
 928 ifdef CONFIG_LOCALVERSION_AUTO
 929         _localver-auto = $(shell $(CONFIG_SHELL) \
 930                           $(srctree)/scripts/setlocalversion $(srctree))
 931         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 932 endif
 933
 934 localver-full = $(localver)$(localver-auto)
 935
 936 # Store (new) KERNELRELASE string in include/config/kernel.release
 937 kernelrelease = $(KERNELVERSION)$(localver-full)
 938 include/config/kernel.release: include/config/auto.conf FORCE
 939         $(Q)rm -f $@
 940         $(Q)echo $(kernelrelease) > $@
 941
 942
 943 # Things we need to do before we recursively start building the kernel
 944 # or the modules are listed in "prepare".
 945 # A multi level approach is used. prepareN is processed before prepareN-1.
 946 # archprepare is used in arch Makefiles and when processed asm symlink,
 947 # version.h and scripts_basic is processed / created.
 948
 949 # Listed in dependency order
 950 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 951
 952 # prepare3 is used to check if we are building in a separate output directory,
 953 # and if so do:
 954 # 1) Check that make has not been executed in the kernel src $(srctree)
 955 # 2) Create the include2 directory, used for the second asm symlink
 956 prepare3: include/config/kernel.release
 957 ifneq ($(KBUILD_SRC),)
 958         @$(kecho) '  Using $(srctree) as source for kernel'
 959         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 960                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 961                 echo "  in the '$(srctree)' directory.";\
 962                 /bin/false; \
 963         fi;
 964         $(Q)if [ ! -d include2 ]; then                                  \
 965             mkdir -p include2;                                          \
 966             ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 967         fi
 968         ln -fsn $(srctree) source
 969 endif
 970
 971 # prepare2 creates a makefile if using a separate output directory
 972 prepare2: prepare3 outputmakefile
 973
 974 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 975                    include/asm include/config/auto.conf
 976         $(cmd_crmodverdir)
 977
 978 archprepare: prepare1 scripts_basic
 979
 980 prepare0: archprepare FORCE
 981         $(Q)$(MAKE) $(build)=.
 982         $(Q)$(MAKE) $(build)=. missing-syscalls
 983
 984 # All the preparing..
 985 prepare: prepare0
 986
 987 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 988 # done in arch/$(ARCH)/kernel/Makefile
 989
 990 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 991
 992 # The asm symlink changes when $(ARCH) changes.
 993 # Detect this and ask user to run make mrproper
 994 # If asm is a stale symlink (point to dir that does not exist) remove it
 995 define check-symlink
 996         set -e;                                                            \
 997         if [ -L include/asm ]; then                                        \
 998                 asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
 999                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
1000                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1001                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
1002                         exit 1;                                            \
1003                 fi;                                                        \
1004                 test -e $$asmlink || rm include/asm;                       \
1005         elif [ -d include/asm ]; then                                      \
1006                 echo "ERROR: $@ is a directory but a symlink was expected";\
1007                 exit 1;                                                    \
1008         fi
1009 endef
1010
1011 # We create the target directory of the symlink if it does
1012 # not exist so the test in check-symlink works and we have a
1013 # directory for generated filesas used by some architectures.
1014 define create-symlink
1015         if [ ! -L include/asm ]; then                                      \
1016                         $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1017                         if [ ! -d include/asm-$(SRCARCH) ]; then           \
1018                                 mkdir -p include/asm-$(SRCARCH);           \
1019                         fi;                                                \
1020                         ln -fsn asm-$(SRCARCH) $@;                         \
1021         fi
1022 endef
1023
1024 include/asm: FORCE
1025         $(Q)$(check-symlink)
1026         $(Q)$(create-symlink)
1027
1028 # Generate some files
1029 # ---------------------------------------------------------------------------
1030
1031 # KERNELRELEASE can change from a few different places, meaning version.h
1032 # needs to be updated, so this check is forced on all builds
1033
1034 uts_len := 64
1035 define filechk_utsrelease.h
1036         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1037           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1038           exit 1;                                                         \
1039         fi;                                                               \
1040         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1041 endef
1042
1043 define filechk_version.h
1044         (echo \#define LINUX_VERSION_CODE $(shell                             \
1045         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1046         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1047 endef
1048
1049 include/linux/version.h: $(srctree)/Makefile FORCE
1050         $(call filechk,version.h)
1051
1052 include/linux/utsrelease.h: include/config/kernel.release FORCE
1053         $(call filechk,utsrelease.h)
1054
1055 PHONY += headerdep
1056 headerdep:
1057         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1058
1059 # ---------------------------------------------------------------------------
1060
1061 PHONY += depend dep
1062 depend dep:
1063         @echo '*** Warning: make $@ is unnecessary now.'
1064
1065 # ---------------------------------------------------------------------------
1066 # Firmware install
1067 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1068 export INSTALL_FW_PATH
1069
1070 PHONY += firmware_install
1071 firmware_install: FORCE
1072         @mkdir -p $(objtree)/firmware
1073         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1074
1075 # ---------------------------------------------------------------------------
1076 # Kernel headers
1077
1078 #Default location for installed headers
1079 export INSTALL_HDR_PATH = $(objtree)/usr
1080
1081 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1082 # Find out where the Kbuild file is located to support
1083 # arch/$(ARCH)/include/asm
1084 hdr-dir = $(strip                                                         \
1085           $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1086                arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1087
1088 # If we do an all arch process set dst to asm-$(hdr-arch)
1089 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1090
1091 PHONY += __headers
1092 __headers: include/linux/version.h scripts_basic FORCE
1093         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1094
1095 PHONY += headers_install_all
1096 headers_install_all:
1097         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1098
1099 PHONY += headers_install
1100 headers_install: __headers
1101         $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1102         $(error Headers not exportable for the $(SRCARCH) architecture))
1103         $(Q)$(MAKE) $(hdr-inst)=include
1104         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1105
1106 PHONY += headers_check_all
1107 headers_check_all: headers_install_all
1108         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1109
1110 PHONY += headers_check
1111 headers_check: headers_install
1112         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1113         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1114
1115 # ---------------------------------------------------------------------------
1116 # Modules
1117
1118 ifdef CONFIG_MODULES
1119
1120 # By default, build modules as well
1121
1122 all: modules
1123
1124 #       Build modules
1125 #
1126 #       A module can be listed more than once in obj-m resulting in
1127 #       duplicate lines in modules.order files.  Those are removed
1128 #       using awk while concatenating to the final file.
1129
1130 PHONY += modules
1131 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1132         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1133         @$(kecho) '  Building modules, stage 2.';
1134         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1135         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1136
1137
1138 # Target to prepare building external modules
1139 PHONY += modules_prepare
1140 modules_prepare: prepare scripts
1141
1142 # Target to install modules
1143 PHONY += modules_install
1144 modules_install: _modinst_ _modinst_post
1145
1146 PHONY += _modinst_
1147 _modinst_:
1148         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1149                 echo "Warning: you may need to install module-init-tools"; \
1150                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1151                 sleep 1; \
1152         fi
1153         @rm -rf $(MODLIB)/kernel
1154         @rm -f $(MODLIB)/source
1155         @mkdir -p $(MODLIB)/kernel
1156         @ln -s $(srctree) $(MODLIB)/source
1157         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1158                 rm -f $(MODLIB)/build ; \
1159                 ln -s $(objtree) $(MODLIB)/build ; \
1160         fi
1161         @cp -f $(objtree)/modules.order $(MODLIB)/
1162         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1163
1164 # This depmod is only for convenience to give the initial
1165 # boot a modules.dep even before / is mounted read-write.  However the
1166 # boot script depmod is the master version.
1167 PHONY += _modinst_post
1168 _modinst_post: _modinst_
1169         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1170         $(call cmd,depmod)
1171
1172 else # CONFIG_MODULES
1173
1174 # Modules not configured
1175 # ---------------------------------------------------------------------------
1176
1177 modules modules_install: FORCE
1178         @echo
1179         @echo "The present kernel configuration has modules disabled."
1180         @echo "Type 'make config' and enable loadable module support."
1181         @echo "Then build a kernel with module support enabled."
1182         @echo
1183         @exit 1
1184
1185 endif # CONFIG_MODULES
1186
1187 ###
1188 # Cleaning is done on three levels.
1189 # make clean     Delete most generated files
1190 #                Leave enough to build external modules
1191 # make mrproper  Delete the current configuration, and all generated files
1192 # make distclean Remove editor backup files, patch leftover files and the like
1193
1194 # Directories & files removed with 'make clean'
1195 CLEAN_DIRS  += $(MODVERDIR)
1196 CLEAN_FILES +=  vmlinux System.map \
1197                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1198
1199 # Directories & files removed with 'make mrproper'
1200 MRPROPER_DIRS  += include/config include2 usr/include
1201 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1202                   include/linux/autoconf.h include/linux/version.h      \
1203                   include/linux/utsrelease.h                            \
1204                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1205                   Module.symvers Module.markers tags TAGS cscope*
1206
1207 # clean - Delete most, but leave enough to build external modules
1208 #
1209 clean: rm-dirs  := $(CLEAN_DIRS)
1210 clean: rm-files := $(CLEAN_FILES)
1211 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1212
1213 PHONY += $(clean-dirs) clean archclean
1214 $(clean-dirs):
1215         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1216
1217 clean: archclean $(clean-dirs)
1218         $(call cmd,rmdirs)
1219         $(call cmd,rmfiles)
1220         @find . $(RCS_FIND_IGNORE) \
1221                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1222                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1223                 -o -name '*.symtypes' -o -name 'modules.order' \
1224                 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1225                 -type f -print | xargs rm -f
1226
1227 # mrproper - Delete all generated files, including .config
1228 #
1229 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1230 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1231 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1232
1233 PHONY += $(mrproper-dirs) mrproper archmrproper
1234 $(mrproper-dirs):
1235         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1236
1237 mrproper: clean archmrproper $(mrproper-dirs)
1238         $(call cmd,rmdirs)
1239         $(call cmd,rmfiles)
1240
1241 # distclean
1242 #
1243 PHONY += distclean
1244
1245 distclean: mrproper
1246         @find $(srctree) $(RCS_FIND_IGNORE) \
1247                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1248                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1249                 -o -name '.*.rej' -o -size 0 \
1250                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1251                 -type f -print | xargs rm -f
1252
1253
1254 # Packaging of the kernel to various formats
1255 # ---------------------------------------------------------------------------
1256 # rpm target kept for backward compatibility
1257 package-dir     := $(srctree)/scripts/package
1258
1259 %pkg: include/config/kernel.release FORCE
1260         $(Q)$(MAKE) $(build)=$(package-dir) $@
1261 rpm: include/config/kernel.release FORCE
1262         $(Q)$(MAKE) $(build)=$(package-dir) $@
1263
1264
1265 # Brief documentation of the typical targets used
1266 # ---------------------------------------------------------------------------
1267
1268 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1269 boards := $(notdir $(boards))
1270 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1271 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1272
1273 help:
1274         @echo  'Cleaning targets:'
1275         @echo  '  clean           - Remove most generated files but keep the config and'
1276         @echo  '                    enough build support to build external modules'
1277         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1278         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1279         @echo  ''
1280         @echo  'Configuration targets:'
1281         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1282         @echo  ''
1283         @echo  'Other generic targets:'
1284         @echo  '  all             - Build all targets marked with [*]'
1285         @echo  '* vmlinux         - Build the bare kernel'
1286         @echo  '* modules         - Build all modules'
1287         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1288         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1289         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1290         @echo  '  dir/            - Build all files in dir and below'
1291         @echo  '  dir/file.[ois]  - Build specified target only'
1292         @echo  '  dir/file.ko     - Build module including final link'
1293         @echo  '  prepare         - Set up for building external modules'
1294         @echo  '  tags/TAGS       - Generate tags file for editors'
1295         @echo  '  cscope          - Generate cscope index'
1296         @echo  '  kernelrelease   - Output the release version string'
1297         @echo  '  kernelversion   - Output the version stored in Makefile'
1298         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1299          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1300          echo  ''
1301         @echo  'Static analysers'
1302         @echo  '  checkstack      - Generate a list of stack hogs'
1303         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1304         @echo  '  versioncheck    - Sanity check on version.h usage'
1305         @echo  '  includecheck    - Check for duplicate included header files'
1306         @echo  '  export_report   - List the usages of all exported symbols'
1307         @echo  '  headers_check   - Sanity check on exported headers'
1308         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1309          echo  ''
1310         @echo  'Kernel packaging:'
1311         @$(MAKE) $(build)=$(package-dir) help
1312         @echo  ''
1313         @echo  'Documentation targets:'
1314         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1315         @echo  ''
1316         @echo  'Architecture specific targets ($(SRCARCH)):'
1317         @$(if $(archhelp),$(archhelp),\
1318                 echo '  No architecture specific help defined for $(SRCARCH)')
1319         @echo  ''
1320         @$(if $(boards), \
1321                 $(foreach b, $(boards), \
1322                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1323                 echo '')
1324         @$(if $(board-dirs), \
1325                 $(foreach b, $(board-dirs), \
1326                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1327                 printf "  %-16s - Show all of the above\\n" help-boards; \
1328                 echo '')
1329
1330         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1331         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1332         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1333         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1334         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1335         @echo  ''
1336         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1337         @echo  'For further info see the ./README file'
1338
1339
1340 help-board-dirs := $(addprefix help-,$(board-dirs))
1341
1342 help-boards: $(help-board-dirs)
1343
1344 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1345
1346 $(help-board-dirs): help-%:
1347         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1348         @$(if $(boards-per-dir), \
1349                 $(foreach b, $(boards-per-dir), \
1350                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1351                 echo '')
1352
1353
1354 # Documentation targets
1355 # ---------------------------------------------------------------------------
1356 %docs: scripts_basic FORCE
1357         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1358
1359 else # KBUILD_EXTMOD
1360
1361 ###
1362 # External module support.
1363 # When building external modules the kernel used as basis is considered
1364 # read-only, and no consistency checks are made and the make
1365 # system is not used on the basis kernel. If updates are required
1366 # in the basis kernel ordinary make commands (without M=...) must
1367 # be used.
1368 #
1369 # The following are the only valid targets when building external
1370 # modules.
1371 # make M=dir clean     Delete all automatically generated files
1372 # make M=dir modules   Make all modules in specified dir
1373 # make M=dir           Same as 'make M=dir modules'
1374 # make M=dir modules_install
1375 #                      Install the modules built in the module directory
1376 #                      Assumes install directory is already created
1377
1378 # We are always building modules
1379 KBUILD_MODULES := 1
1380 PHONY += crmodverdir
1381 crmodverdir:
1382         $(cmd_crmodverdir)
1383
1384 PHONY += $(objtree)/Module.symvers
1385 $(objtree)/Module.symvers:
1386         @test -e $(objtree)/Module.symvers || ( \
1387         echo; \
1388         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1389         echo "           is missing; modules will have no dependencies and modversions."; \
1390         echo )
1391
1392 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1393 PHONY += $(module-dirs) modules
1394 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1395         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1396
1397 modules: $(module-dirs)
1398         @$(kecho) '  Building modules, stage 2.';
1399         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1400
1401 PHONY += modules_install
1402 modules_install: _emodinst_ _emodinst_post
1403
1404 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1405 PHONY += _emodinst_
1406 _emodinst_:
1407         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1408         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1409
1410 PHONY += _emodinst_post
1411 _emodinst_post: _emodinst_
1412         $(call cmd,depmod)
1413
1414 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1415
1416 PHONY += $(clean-dirs) clean
1417 $(clean-dirs):
1418         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1419
1420 clean:  rm-dirs := $(MODVERDIR)
1421 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1422 clean: $(clean-dirs)
1423         $(call cmd,rmdirs)
1424         $(call cmd,rmfiles)
1425         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1426                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1427                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1428                 -type f -print | xargs rm -f
1429
1430 help:
1431         @echo  '  Building external modules.'
1432         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1433         @echo  ''
1434         @echo  '  modules         - default target, build the module(s)'
1435         @echo  '  modules_install - install the module'
1436         @echo  '  clean           - remove generated files in module directory only'
1437         @echo  ''
1438
1439 # Dummies...
1440 PHONY += prepare scripts
1441 prepare: ;
1442 scripts: ;
1443 endif # KBUILD_EXTMOD
1444
1445 # Generate tags for editors
1446 # ---------------------------------------------------------------------------
1447 quiet_cmd_tags = GEN     $@
1448       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1449
1450 tags TAGS cscope: FORCE
1451         $(call cmd,tags)
1452
1453 # Scripts to check various things for consistency
1454 # ---------------------------------------------------------------------------
1455
1456 includecheck:
1457         find * $(RCS_FIND_IGNORE) \
1458                 -name '*.[hcS]' -type f -print | sort \
1459                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1460
1461 versioncheck:
1462         find * $(RCS_FIND_IGNORE) \
1463                 -name '*.[hcS]' -type f -print | sort \
1464                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1465
1466 namespacecheck:
1467         $(PERL) $(srctree)/scripts/namespace.pl
1468
1469 export_report:
1470         $(PERL) $(srctree)/scripts/export_report.pl
1471
1472 endif #ifeq ($(config-targets),1)
1473 endif #ifeq ($(mixed-targets),1)
1474
1475 PHONY += checkstack kernelrelease kernelversion
1476
1477 # UML needs a little special treatment here.  It wants to use the host
1478 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1479 # else wants $(ARCH), including people doing cross-builds, which means
1480 # that $(SUBARCH) doesn't work here.
1481 ifeq ($(ARCH), um)
1482 CHECKSTACK_ARCH := $(SUBARCH)
1483 else
1484 CHECKSTACK_ARCH := $(ARCH)
1485 endif
1486 checkstack:
1487         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1488         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1489
1490 kernelrelease:
1491         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1492         $(error kernelrelease not valid - run 'make prepare' to update it))
1493 kernelversion:
1494         @echo $(KERNELVERSION)
1495
1496 # Single targets
1497 # ---------------------------------------------------------------------------
1498 # Single targets are compatible with:
1499 # - build with mixed source and output
1500 # - build with separate output dir 'make O=...'
1501 # - external modules
1502 #
1503 #  target-dir => where to store outputfile
1504 #  build-dir  => directory in kernel source tree to use
1505
1506 ifeq ($(KBUILD_EXTMOD),)
1507         build-dir  = $(patsubst %/,%,$(dir $@))
1508         target-dir = $(dir $@)
1509 else
1510         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1511         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1512         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1513 endif
1514
1515 %.s: %.c prepare scripts FORCE
1516         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1517 %.i: %.c prepare scripts FORCE
1518         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1519 %.o: %.c prepare scripts FORCE
1520         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1521 %.lst: %.c prepare scripts FORCE
1522         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523 %.s: %.S prepare scripts FORCE
1524         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525 %.o: %.S prepare scripts FORCE
1526         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527 %.symtypes: %.c prepare scripts FORCE
1528         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529
1530 # Modules
1531 /: prepare scripts FORCE
1532         $(cmd_crmodverdir)
1533         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1534         $(build)=$(build-dir)
1535 %/: prepare scripts FORCE
1536         $(cmd_crmodverdir)
1537         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1538         $(build)=$(build-dir)
1539 %.ko: prepare scripts FORCE
1540         $(cmd_crmodverdir)
1541         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1542         $(build)=$(build-dir) $(@:.ko=.o)
1543         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1544
1545 # FIXME Should go into a make.lib or something
1546 # ===========================================================================
1547
1548 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1549       cmd_rmdirs = rm -rf $(rm-dirs)
1550
1551 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1552       cmd_rmfiles = rm -f $(rm-files)
1553
1554 # Run depmod only if we have System.map and depmod is executable
1555 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1556       cmd_depmod = \
1557         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1558                 $(DEPMOD) -ae -F System.map                                     \
1559                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1560                 $(KERNELRELEASE);                                               \
1561         fi
1562
1563 # Create temporary dir for module support files
1564 # clean it up only when building all modules
1565 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1566                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1567
1568 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1569           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1570           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1571
1572 quiet_cmd_as_o_S = AS      $@
1573 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1574
1575 # read all saved command lines
1576
1577 targets := $(wildcard $(sort $(targets)))
1578 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1579
1580 ifneq ($(cmd_files),)
1581   $(cmd_files): ;       # Do not try to update included dependency files
1582   include $(cmd_files)
1583 endif
1584
1585 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1586 # Usage:
1587 # $(Q)$(MAKE) $(clean)=dir
1588 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1589
1590 endif   # skip-makefile
1591
1592 PHONY += FORCE
1593 FORCE:
1594
1595 # Declare the contents of the .PHONY variable as phony.  We keep that
1596 # information in a variable se we can use it in if_changed and friends.
1597 .PHONY: $(PHONY)