Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 13
   4 EXTRAVERSION =
   5 NAME=Affluent Albatross
   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 print "Entering directory ..."
  14 MAKEFLAGS += --no-print-directory
  15
  16 # We are using a recursive build, so we need to do a little thinking
  17 # to get the ordering right.
  18 #
  19 # Most importantly: sub-Makefiles should only ever modify files in
  20 # their own directory. If in some directory we have a dependency on
  21 # a file in another dir (which doesn't happen often, but it's often
  22 # unavoidable when linking the built-in.o targets which finally
  23 # turn into vmlinux), we will call a sub make in that other dir, and
  24 # after that we are sure that everything which is in that other dir
  25 # is now up to date.
  26 #
  27 # The only cases where we need to modify files which have global
  28 # effects are thus separated out and done before the recursive
  29 # descending is started. They are now explicitly listed as the
  30 # prepare rule.
  31
  32 # To put more focus on warnings, be less verbose as default
  33 # Use 'make V=1' to see the full commands
  34
  35 ifdef V
  36   ifeq ("$(origin V)", "command line")
  37     KBUILD_VERBOSE = $(V)
  38   endif
  39 endif
  40 ifndef KBUILD_VERBOSE
  41   KBUILD_VERBOSE = 0
  42 endif
  43
  44 # Call sparse as part of compilation of C files
  45 # Use 'make C=1' to enable sparse checking
  46
  47 ifdef C
  48   ifeq ("$(origin C)", "command line")
  49     KBUILD_CHECKSRC = $(C)
  50   endif
  51 endif
  52 ifndef KBUILD_CHECKSRC
  53   KBUILD_CHECKSRC = 0
  54 endif
  55
  56 # Use make M=dir to specify directory of external module to build
  57 # Old syntax make ... SUBDIRS=$PWD is still supported
  58 # Setting the environment variable KBUILD_EXTMOD take precedence
  59 ifdef SUBDIRS
  60   KBUILD_EXTMOD ?= $(SUBDIRS)
  61 endif
  62 ifdef M
  63   ifeq ("$(origin M)", "command line")
  64     KBUILD_EXTMOD := $(M)
  65   endif
  66 endif
  67
  68
  69 # kbuild supports saving output files in a separate directory.
  70 # To locate output files in a separate directory two syntaxes are supported.
  71 # In both cases the working directory must be the root of the kernel src.
  72 # 1) O=
  73 # Use "make O=dir/to/store/output/files/"
  74 #
  75 # 2) Set KBUILD_OUTPUT
  76 # Set the environment variable KBUILD_OUTPUT to point to the directory
  77 # where the output files shall be placed.
  78 # export KBUILD_OUTPUT=dir/to/store/output/files/
  79 # make
  80 #
  81 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  82 # variable.
  83
  84
  85 # KBUILD_SRC is set on invocation of make in OBJ directory
  86 # KBUILD_SRC is not intended to be used by the regular user (for now)
  87 ifeq ($(KBUILD_SRC),)
  88
  89 # OK, Make called in directory where kernel src resides
  90 # Do we want to locate output files in a separate directory?
  91 ifdef O
  92   ifeq ("$(origin O)", "command line")
  93     KBUILD_OUTPUT := $(O)
  94   endif
  95 endif
  96
  97 # That's our default target when none is given on the command line
  98 .PHONY: _all
  99 _all:
 100
 101 ifneq ($(KBUILD_OUTPUT),)
 102 # Invoke a second make in the output directory, passing relevant variables
 103 # check that the output directory actually exists
 104 saved-output := $(KBUILD_OUTPUT)
 105 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 106 $(if $(KBUILD_OUTPUT),, \
 107      $(error output directory "$(saved-output)" does not exist))
 108
 109 .PHONY: $(MAKECMDGOALS)
 110
 111 $(filter-out _all,$(MAKECMDGOALS)) _all:
 112         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 113         KBUILD_SRC=$(CURDIR) \
 114         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
 115
 116 # Leave processing to above invocation of make
 117 skip-makefile := 1
 118 endif # ifneq ($(KBUILD_OUTPUT),)
 119 endif # ifeq ($(KBUILD_SRC),)
 120
 121 # We process the rest of the Makefile if this is the final invocation of make
 122 ifeq ($(skip-makefile),)
 123
 124 # If building an external module we do not care about the all: rule
 125 # but instead _all depend on modules
 126 .PHONY: all
 127 ifeq ($(KBUILD_EXTMOD),)
 128 _all: all
 129 else
 130 _all: modules
 131 endif
 132
 133 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 134 TOPDIR          := $(srctree)
 135 # FIXME - TOPDIR is obsolete, use srctree/objtree
 136 objtree         := $(CURDIR)
 137 src             := $(srctree)
 138 obj             := $(objtree)
 139
 140 VPATH           := $(srctree)
 141
 142 export srctree objtree VPATH TOPDIR
 143
 144 nullstring :=
 145 space      := $(nullstring) # end of line
 146
 147 # Take the contents of any files called localversion* and the config
 148 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. Be
 149 # careful not to include files twice if building in the source
 150 # directory. LOCALVERSION from the command line override all of this
 151
 152 localver := $(objtree)/localversion* $(srctree)/localversion*
 153 localver := $(sort $(wildcard $(localver)))
 154 # skip backup files (containing '~')
 155 localver := $(foreach f, $(localver), $(if $(findstring ~, $(f)),,$(f)))
 156
 157 LOCALVERSION = $(subst $(space),, \
 158                $(shell cat /dev/null $(localver)) \
 159                $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 160
 161 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)
 162
 163 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 164 # first, and if a usermode build is happening, the "ARCH=um" on the command
 165 # line overrides the setting of ARCH below.  If a native build is happening,
 166 # then ARCH is assigned, getting whatever value it gets normally, and
 167 # SUBARCH is subsequently ignored.
 168
 169 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 170                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 171                                   -e s/s390x/s390/ -e s/parisc64/parisc/ )
 172
 173 # Cross compiling and selecting different set of gcc/bin-utils
 174 # ---------------------------------------------------------------------------
 175 #
 176 # When performing cross compilation for other architectures ARCH shall be set
 177 # to the target architecture. (See arch/* for the possibilities).
 178 # ARCH can be set during invocation of make:
 179 # make ARCH=ia64
 180 # Another way is to have ARCH set in the environment.
 181 # The default ARCH is the host where make is executed.
 182
 183 # CROSS_COMPILE specify the prefix used for all executables used
 184 # during compilation. Only gcc and related bin-utils executables
 185 # are prefixed with $(CROSS_COMPILE).
 186 # CROSS_COMPILE can be set on the command line
 187 # make CROSS_COMPILE=ia64-linux-
 188 # Alternatively CROSS_COMPILE can be set in the environment.
 189 # Default value for CROSS_COMPILE is not to prefix executables
 190 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 191
 192 ARCH            ?= $(SUBARCH)
 193 CROSS_COMPILE   ?=
 194
 195 # Architecture as present in compile.h
 196 UTS_MACHINE := $(ARCH)
 197
 198 # SHELL used by kbuild
 199 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 200           else if [ -x /bin/bash ]; then echo /bin/bash; \
 201           else echo sh; fi ; fi)
 202
 203 HOSTCC          = gcc
 204 HOSTCXX         = g++
 205 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 206 HOSTCXXFLAGS    = -O2
 207
 208 #       Decide whether to build built-in, modular, or both.
 209 #       Normally, just do built-in.
 210
 211 KBUILD_MODULES :=
 212 KBUILD_BUILTIN := 1
 213
 214 #       If we have only "make modules", don't compile built-in objects.
 215 #       When we're building modules with modversions, we need to consider
 216 #       the built-in objects during the descend as well, in order to
 217 #       make sure the checksums are uptodate before we record them.
 218
 219 ifeq ($(MAKECMDGOALS),modules)
 220   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 221 endif
 222
 223 #       If we have "make <whatever> modules", compile modules
 224 #       in addition to whatever we do anyway.
 225 #       Just "make" or "make all" shall build modules as well
 226
 227 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 228   KBUILD_MODULES := 1
 229 endif
 230
 231 ifeq ($(MAKECMDGOALS),)
 232   KBUILD_MODULES := 1
 233 endif
 234
 235 export KBUILD_MODULES KBUILD_BUILTIN
 236 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 237
 238 # Beautify output
 239 # ---------------------------------------------------------------------------
 240 #
 241 # Normally, we echo the whole command before executing it. By making
 242 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 243 # $(quiet) to choose other forms of output instead, e.g.
 244 #
 245 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 246 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 247 #
 248 # If $(quiet) is empty, the whole command will be printed.
 249 # If it is set to "quiet_", only the short version will be printed.
 250 # If it is set to "silent_", nothing wil be printed at all, since
 251 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 252 #
 253 # A simple variant is to prefix commands with $(Q) - that's usefull
 254 # for commands that shall be hidden in non-verbose mode.
 255 #
 256 #       $(Q)ln $@ :<
 257 #
 258 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 259 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 260
 261 ifeq ($(KBUILD_VERBOSE),1)
 262   quiet =
 263   Q =
 264 else
 265   quiet=quiet_
 266   Q = @
 267 endif
 268
 269 # If the user is running make -s (silent mode), suppress echoing of
 270 # commands
 271
 272 ifneq ($(findstring s,$(MAKEFLAGS)),)
 273   quiet=silent_
 274 endif
 275
 276 export quiet Q KBUILD_VERBOSE
 277
 278 ######
 279 # cc support functions to be used (only) in arch/$(ARCH)/Makefile
 280 # See documentation in Documentation/kbuild/makefiles.txt
 281
 282 # cc-option
 283 # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
 284
 285 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 286              > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 287
 288 # For backward compatibility
 289 check_gcc = $(warning check_gcc is deprecated - use cc-option) \
 290             $(call cc-option, $(1),$(2))
 291
 292 # cc-option-yn
 293 # Usage: flag := $(call cc-option-yn, -march=winchip-c6)
 294 cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 295                 > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
 296
 297 # cc-option-align
 298 # Prefix align with either -falign or -malign
 299 cc-option-align = $(subst -functions=0,,\
 300         $(call cc-option,-falign-functions=0,-malign-functions=0))
 301
 302 # cc-version
 303 # Usage gcc-ver := $(call cc-version $(CC))
 304 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
 305               $(if $(1), $(1), $(CC)))
 306
 307
 308 # Look for make include files relative to root of kernel src
 309 MAKEFLAGS += --include-dir=$(srctree)
 310
 311 # We need some generic definitions
 312 include  $(srctree)/scripts/Kbuild.include
 313
 314 # For maximum performance (+ possibly random breakage, uncomment
 315 # the following)
 316
 317 #MAKEFLAGS += -rR
 318
 319 # Make variables (CC, etc...)
 320
 321 AS              = $(CROSS_COMPILE)as
 322 LD              = $(CROSS_COMPILE)ld
 323 CC              = $(CROSS_COMPILE)gcc
 324 CPP             = $(CC) -E
 325 AR              = $(CROSS_COMPILE)ar
 326 NM              = $(CROSS_COMPILE)nm
 327 STRIP           = $(CROSS_COMPILE)strip
 328 OBJCOPY         = $(CROSS_COMPILE)objcopy
 329 OBJDUMP         = $(CROSS_COMPILE)objdump
 330 AWK             = awk
 331 GENKSYMS        = scripts/genksyms/genksyms
 332 DEPMOD          = /sbin/depmod
 333 KALLSYMS        = scripts/kallsyms
 334 PERL            = perl
 335 CHECK           = sparse
 336
 337 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ $(CF)
 338 MODFLAGS        = -DMODULE
 339 CFLAGS_MODULE   = $(MODFLAGS)
 340 AFLAGS_MODULE   = $(MODFLAGS)
 341 LDFLAGS_MODULE  = -r
 342 CFLAGS_KERNEL   =
 343 AFLAGS_KERNEL   =
 344
 345
 346 # Use LINUXINCLUDE when you must reference the include/ directory.
 347 # Needed to be compatible with the O= option
 348 LINUXINCLUDE    := -Iinclude \
 349                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
 350
 351 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 352
 353 CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 354                    -fno-strict-aliasing -fno-common \
 355                    -ffreestanding
 356 AFLAGS          := -D__ASSEMBLY__
 357
 358 export  VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \
 359         ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 360         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 361         HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 362
 363 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 364 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 365 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 366
 367 # When compiling out-of-tree modules, put MODVERDIR in the module
 368 # tree rather than in the kernel tree. The kernel tree might
 369 # even be read-only.
 370 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 371
 372 # Files to ignore in find ... statements
 373
 374 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg \) -prune -o
 375 RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg
 376
 377 # ===========================================================================
 378 # Rules shared between *config targets and build targets
 379
 380 # Basic helpers built in scripts/
 381 .PHONY: scripts_basic
 382 scripts_basic:
 383         $(Q)$(MAKE) $(build)=scripts/basic
 384
 385 .PHONY: outputmakefile
 386 # outputmakefile generate a Makefile to be placed in output directory, if
 387 # using a seperate output directory. This allows convinient use
 388 # of make in output directory
 389 outputmakefile:
 390         $(Q)if test ! $(srctree) -ef $(objtree); then \
 391         $(CONFIG_SHELL) $(srctree)/scripts/mkmakefile              \
 392             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)         \
 393             > $(objtree)/Makefile;                                 \
 394             echo '  GEN    $(objtree)/Makefile';                   \
 395         fi
 396
 397 # To make sure we do not include .config for any of the *config targets
 398 # catch them early, and hand them over to scripts/kconfig/Makefile
 399 # It is allowed to specify more targets when calling make, including
 400 # mixing *config targets and build targets.
 401 # For example 'make oldconfig all'.
 402 # Detect when mixed targets is specified, and make a second invocation
 403 # of make so .config is not included in this case either (for *config).
 404
 405 no-dot-config-targets := clean mrproper distclean \
 406                          cscope TAGS tags help %docs check%
 407
 408 config-targets := 0
 409 mixed-targets  := 0
 410 dot-config     := 1
 411
 412 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 413         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 414                 dot-config := 0
 415         endif
 416 endif
 417
 418 ifeq ($(KBUILD_EXTMOD),)
 419         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 420                 config-targets := 1
 421                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 422                         mixed-targets := 1
 423                 endif
 424         endif
 425 endif
 426
 427 ifeq ($(mixed-targets),1)
 428 # ===========================================================================
 429 # We're called with mixed targets (*config and build targets).
 430 # Handle them one by one.
 431
 432 %:: FORCE
 433         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 434
 435 else
 436 ifeq ($(config-targets),1)
 437 # ===========================================================================
 438 # *config targets only - make sure prerequisites are updated, and descend
 439 # in scripts/kconfig to make the *config target
 440
 441 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 442 # KBUILD_DEFCONFIG may point out an alternative default configuration
 443 # used for 'make defconfig'
 444 include $(srctree)/arch/$(ARCH)/Makefile
 445 export KBUILD_DEFCONFIG
 446
 447 config: scripts_basic outputmakefile FORCE
 448         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 449 %config: scripts_basic outputmakefile FORCE
 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 parrallel
 461 .PHONY: scripts
 462 scripts: scripts_basic include/config/MARKER
 463         $(Q)$(MAKE) $(build)=$(@)
 464
 465 scripts_basic: include/linux/autoconf.h
 466
 467 # Objects we will link into vmlinux / subdirs we need to visit
 468 init-y          := init/
 469 drivers-y       := drivers/ sound/
 470 net-y           := net/
 471 libs-y          := lib/
 472 core-y          := usr/
 473 endif # KBUILD_EXTMOD
 474
 475 ifeq ($(dot-config),1)
 476 # In this section, we need .config
 477
 478 # Read in dependencies to all Kconfig* files, make sure to run
 479 # oldconfig if changes are detected.
 480 -include .config.cmd
 481
 482 include .config
 483
 484 # If .config needs to be updated, it will be done via the dependency
 485 # that autoconf has on .config.
 486 # To avoid any implicit rule to kick in, define an empty command
 487 .config: ;
 488
 489 # If .config is newer than include/linux/autoconf.h, someone tinkered
 490 # with it and forgot to run make oldconfig
 491 include/linux/autoconf.h: .config
 492         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 493 else
 494 # Dummy target needed, because used as prerequisite
 495 include/linux/autoconf.h: ;
 496 endif
 497
 498 # The all: target is the default when no target is given on the
 499 # command line.
 500 # This allow a user to issue only 'make' to build a kernel including modules
 501 # Defaults vmlinux but it is usually overriden in the arch makefile
 502 all: vmlinux
 503
 504 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 505 CFLAGS          += -Os
 506 else
 507 CFLAGS          += -O2
 508 endif
 509
 510 #Add align options if CONFIG_CC_* is not equal to 0
 511 add-align = $(if $(filter-out 0,$($(1))),$(cc-option-align)$(2)=$($(1)))
 512 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_FUNCTIONS,-functions)
 513 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LABELS,-labels)
 514 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
 515 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
 516
 517 ifdef CONFIG_FRAME_POINTER
 518 CFLAGS          += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 519 else
 520 CFLAGS          += -fomit-frame-pointer
 521 endif
 522
 523 ifdef CONFIG_DEBUG_INFO
 524 CFLAGS          += -g
 525 endif
 526
 527 include $(srctree)/arch/$(ARCH)/Makefile
 528
 529 # arch Makefile may override CC so keep this after arch Makefile is included
 530 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 531 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 532
 533 # warn about C99 declaration after statement
 534 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 535
 536 # disable pointer signedness warnings in gcc 4.0
 537 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 538
 539 # Default kernel image to build when no specific target is given.
 540 # KBUILD_IMAGE may be overruled on the commandline or
 541 # set in the environment
 542 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 543 # this default value
 544 export KBUILD_IMAGE ?= vmlinux
 545
 546 #
 547 # INSTALL_PATH specifies where to place the updated kernel and system map
 548 # images. Default is /boot, but you can set it to other values
 549 export  INSTALL_PATH ?= /boot
 550
 551 # If CONFIG_LOCALVERSION_AUTO is set, we automatically perform some tests
 552 # and try to determine if the current source tree is a release tree, of any sort,
 553 # or if is a pure development tree.
 554 #
 555 # A 'release tree' is any tree with a git TAG associated
 556 # with it.  The primary goal of this is to make it safe for a native
 557 # git/CVS/SVN user to build a release tree (i.e, 2.6.9) and also to
 558 # continue developing against the current Linus tree, without having the Linus
 559 # tree overwrite the 2.6.9 tree when installed.
 560 #
 561 # Currently, only git is supported.
 562 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 563 # checks as needed.
 564
 565
 566 ifdef CONFIG_LOCALVERSION_AUTO
 567         localversion-auto := $(shell $(PERL) $(srctree)/scripts/setlocalversion $(srctree))
 568         LOCALVERSION := $(LOCALVERSION)$(localversion-auto)
 569 endif
 570
 571 #
 572 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 573 # relocations required by build roots.  This is not defined in the
 574 # makefile but the arguement can be passed to make if needed.
 575 #
 576
 577 MODLIB  := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 578 export MODLIB
 579
 580
 581 ifeq ($(KBUILD_EXTMOD),)
 582 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/
 583
 584 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 585                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 586                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 587
 588 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 589                      $(init-n) $(init-) \
 590                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 591                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 592
 593 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 594 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 595 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 596 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 597 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 598 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 599 libs-y          := $(libs-y1) $(libs-y2)
 600
 601 # Build vmlinux
 602 # ---------------------------------------------------------------------------
 603 # vmlinux is build from the objects selected by $(vmlinux-init) and
 604 # $(vmlinux-main). Most are built-in.o files from top-level directories
 605 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 606 # Ordering when linking is important, and $(vmlinux-init) must be first.
 607 #
 608 # vmlinux
 609 #   ^
 610 #   |
 611 #   +-< $(vmlinux-init)
 612 #   |   +--< init/version.o + more
 613 #   |
 614 #   +--< $(vmlinux-main)
 615 #   |    +--< driver/built-in.o mm/built-in.o + more
 616 #   |
 617 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 618 #
 619 # vmlinux version (uname -v) cannot be updated during normal
 620 # descending-into-subdirs phase since we do not yet know if we need to
 621 # update vmlinux.
 622 # Therefore this step is delayed until just before final link of vmlinux -
 623 # except in the kallsyms case where it is done just before adding the
 624 # symbols to the kernel.
 625 #
 626 # System.map is generated to document addresses of all kernel symbols
 627
 628 vmlinux-init := $(head-y) $(init-y)
 629 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 630 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 631 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 632
 633 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 634 # May be overridden by arch/$(ARCH)/Makefile
 635 quiet_cmd_vmlinux__ ?= LD      $@
 636       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 637       -T $(vmlinux-lds) $(vmlinux-init)                          \
 638       --start-group $(vmlinux-main) --end-group                  \
 639       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 640
 641 # Generate new vmlinux version
 642 quiet_cmd_vmlinux_version = GEN     .version
 643       cmd_vmlinux_version = set -e;                     \
 644         if [ ! -r .version ]; then                      \
 645           rm -f .version;                               \
 646           echo 1 >.version;                             \
 647         else                                            \
 648           mv .version .old_version;                     \
 649           expr 0$$(cat .old_version) + 1 >.version;     \
 650         fi;                                             \
 651         $(MAKE) $(build)=init
 652
 653 # Generate System.map
 654 quiet_cmd_sysmap = SYSMAP
 655       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 656
 657 # Link of vmlinux
 658 # If CONFIG_KALLSYMS is set .version is already updated
 659 # Generate System.map and verify that the content is consistent
 660
 661 define rule_vmlinux__
 662         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 663
 664         $(call cmd,vmlinux__)
 665         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 666
 667         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 668           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 669         $(cmd_sysmap) $@ System.map;                    \
 670         if [ $$? -ne 0 ]; then                          \
 671                 rm -f $@;                               \
 672                 /bin/false;                             \
 673         fi;
 674         $(verify_kallsyms)
 675 endef
 676
 677
 678 ifdef CONFIG_KALLSYMS
 679 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 680 # It's a three stage process:
 681 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 682 #   empty
 683 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 684 #   the right size - vmlinux version (uname -v) is updated during this step
 685 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 686 #   but due to the added section, some addresses have shifted.
 687 #   From here, we generate a correct .tmp_kallsyms2.o
 688 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 689 # o Verify that the System.map from vmlinux matches the map from
 690 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 691 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 692 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 693 #   temporary bypass to allow the kernel to be built while the
 694 #   maintainers work out what went wrong with kallsyms.
 695
 696 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 697 last_kallsyms := 3
 698 else
 699 last_kallsyms := 2
 700 endif
 701
 702 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 703
 704 define verify_kallsyms
 705         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 706           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 707           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 708         $(Q)cmp -s System.map .tmp_System.map ||              \
 709                 (echo Inconsistent kallsyms data;             \
 710                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 711                  rm .tmp_kallsyms* ; /bin/false )
 712 endef
 713
 714 # Update vmlinux version before link
 715 # Use + in front of this rule to silent warning about make -j1
 716 # First command is ':' to allow us to use + in front of this rule
 717 cmd_ksym_ld = $(cmd_vmlinux__)
 718 define rule_ksym_ld
 719         :
 720         +$(call cmd,vmlinux_version)
 721         $(call cmd,vmlinux__)
 722         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 723 endef
 724
 725 # Generate .S file with all kernel symbols
 726 quiet_cmd_kallsyms = KSYM    $@
 727       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 728                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 729
 730 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 731         $(call if_changed_dep,as_o_S)
 732
 733 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 734         $(call cmd,kallsyms)
 735
 736 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 737 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 738         $(call if_changed_rule,ksym_ld)
 739
 740 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 741         $(call if_changed,vmlinux__)
 742
 743 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 744         $(call if_changed,vmlinux__)
 745
 746 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 747 $(KALLSYMS): scripts ;
 748
 749 # Generate some data for debugging strange kallsyms problems
 750 debug_kallsyms: .tmp_map$(last_kallsyms)
 751
 752 .tmp_map%: .tmp_vmlinux% FORCE
 753         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 754
 755 .tmp_map3: .tmp_map2
 756
 757 .tmp_map2: .tmp_map1
 758
 759 endif # ifdef CONFIG_KALLSYMS
 760
 761 # vmlinux image - including updated kernel symbols
 762 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 763         $(call if_changed_rule,vmlinux__)
 764         $(Q)rm -f .old_version
 765
 766 # The actual objects are generated when descending,
 767 # make sure no implicit rule kicks in
 768 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 769
 770 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 771 # Preset locale variables to speed up the build process. Limit locale
 772 # tweaks to this spot to avoid wrong language settings when running
 773 # make menuconfig etc.
 774 # Error messages still appears in the original language
 775
 776 .PHONY: $(vmlinux-dirs)
 777 $(vmlinux-dirs): prepare-all scripts
 778         $(Q)$(MAKE) $(build)=$@
 779
 780 # Things we need to do before we recursively start building the kernel
 781 # or the modules are listed in "prepare-all".
 782 # A multi level approach is used. prepare1 is updated first, then prepare0.
 783 # prepare-all is the collection point for the prepare targets.
 784
 785 .PHONY: prepare-all prepare prepare0 prepare1 prepare2 prepare3
 786
 787 # prepare3 is used to check if we are building in a separate output directory,
 788 # and if so do:
 789 # 1) Check that make has not been executed in the kernel src $(srctree)
 790 # 2) Create the include2 directory, used for the second asm symlink
 791
 792 prepare3:
 793 ifneq ($(KBUILD_SRC),)
 794         @echo '  Using $(srctree) as source for kernel'
 795         $(Q)if [ -f $(srctree)/.config ]; then \
 796                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 797                 echo "  in the '$(srctree)' directory.";\
 798                 /bin/false; \
 799         fi;
 800         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 801         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 802 endif
 803
 804 # prepare2 creates a makefile if using a separate output directory
 805 prepare2: prepare3 outputmakefile
 806
 807 prepare1: prepare2 include/linux/version.h include/asm \
 808                    include/config/MARKER
 809 ifneq ($(KBUILD_MODULES),)
 810         $(Q)rm -rf $(MODVERDIR)
 811         $(Q)mkdir -p $(MODVERDIR)
 812 endif
 813
 814 prepare0: prepare prepare1 FORCE
 815         $(Q)$(MAKE) $(build)=$(srctree)
 816
 817 # All the preparing..
 818 prepare-all: prepare0
 819
 820 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 821 #       done in arch/$(ARCH)/kernel/Makefile
 822
 823 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 824
 825 # Single targets
 826 # ---------------------------------------------------------------------------
 827
 828 %.s: %.c scripts FORCE
 829         $(Q)$(MAKE) $(build)=$(@D) $@
 830 %.i: %.c scripts FORCE
 831         $(Q)$(MAKE) $(build)=$(@D) $@
 832 %.o: %.c scripts FORCE
 833         $(Q)$(MAKE) $(build)=$(@D) $@
 834 %.ko: scripts FORCE
 835         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D) $(@:.ko=.o)
 836         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 837 %/:      scripts prepare FORCE
 838         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
 839 %.lst: %.c scripts FORCE
 840         $(Q)$(MAKE) $(build)=$(@D) $@
 841 %.s: %.S scripts FORCE
 842         $(Q)$(MAKE) $(build)=$(@D) $@
 843 %.o: %.S scripts FORCE
 844         $(Q)$(MAKE) $(build)=$(@D) $@
 845
 846 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 847 #       hard to detect, but I suppose "make mrproper" is a good idea
 848 #       before switching between archs anyway.
 849
 850 include/asm:
 851         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 852         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 853         @ln -fsn asm-$(ARCH) $@
 854
 855 #       Split autoconf.h into include/linux/config/*
 856
 857 include/config/MARKER: include/linux/autoconf.h
 858         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 859         @scripts/basic/split-include include/linux/autoconf.h include/config
 860         @touch $@
 861
 862 # Generate some files
 863 # ---------------------------------------------------------------------------
 864
 865 # KERNELRELEASE can change from a few different places, meaning version.h
 866 # needs to be updated, so this check is forced on all builds
 867
 868 uts_len := 64
 869
 870 define filechk_version.h
 871         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 872           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 873           exit 1; \
 874         fi; \
 875         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 876           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 877          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 878         )
 879 endef
 880
 881 include/linux/version.h: $(srctree)/Makefile FORCE
 882         $(call filechk,version.h)
 883
 884 # ---------------------------------------------------------------------------
 885
 886 .PHONY: depend dep
 887 depend dep:
 888         @echo '*** Warning: make $@ is unnecessary now.'
 889
 890 # ---------------------------------------------------------------------------
 891 # Modules
 892
 893 ifdef CONFIG_MODULES
 894
 895 #       By default, build modules as well
 896
 897 all: modules
 898
 899 #       Build modules
 900
 901 .PHONY: modules
 902 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 903         @echo '  Building modules, stage 2.';
 904         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 905
 906
 907 # Target to prepare building external modules
 908 .PHONY: modules_prepare
 909 modules_prepare: prepare-all scripts
 910
 911 # Target to install modules
 912 .PHONY: modules_install
 913 modules_install: _modinst_ _modinst_post
 914
 915 .PHONY: _modinst_
 916 _modinst_:
 917         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 918                 echo "Warning: you may need to install module-init-tools"; \
 919                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 920                 sleep 1; \
 921         fi
 922         @rm -rf $(MODLIB)/kernel
 923         @rm -f $(MODLIB)/source
 924         @mkdir -p $(MODLIB)/kernel
 925         @ln -s $(srctree) $(MODLIB)/source
 926         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 927                 rm -f $(MODLIB)/build ; \
 928                 ln -s $(objtree) $(MODLIB)/build ; \
 929         fi
 930         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 931
 932 # If System.map exists, run depmod.  This deliberately does not have a
 933 # dependency on System.map since that would run the dependency tree on
 934 # vmlinux.  This depmod is only for convenience to give the initial
 935 # boot a modules.dep even before / is mounted read-write.  However the
 936 # boot script depmod is the master version.
 937 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 938 depmod_opts     :=
 939 else
 940 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 941 endif
 942 .PHONY: _modinst_post
 943 _modinst_post: _modinst_
 944         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 945
 946 else # CONFIG_MODULES
 947
 948 # Modules not configured
 949 # ---------------------------------------------------------------------------
 950
 951 modules modules_install: FORCE
 952         @echo
 953         @echo "The present kernel configuration has modules disabled."
 954         @echo "Type 'make config' and enable loadable module support."
 955         @echo "Then build a kernel with module support enabled."
 956         @echo
 957         @exit 1
 958
 959 endif # CONFIG_MODULES
 960
 961 ###
 962 # Cleaning is done on three levels.
 963 # make clean     Delete most generated files
 964 #                Leave enough to build external modules
 965 # make mrproper  Delete the current configuration, and all generated files
 966 # make distclean Remove editor backup files, patch leftover files and the like
 967
 968 # Directories & files removed with 'make clean'
 969 CLEAN_DIRS  += $(MODVERDIR)
 970 CLEAN_FILES +=  vmlinux System.map \
 971                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 972
 973 # Directories & files removed with 'make mrproper'
 974 MRPROPER_DIRS  += include/config include2
 975 MRPROPER_FILES += .config .config.old include/asm .version \
 976                   include/linux/autoconf.h include/linux/version.h \
 977                   Module.symvers tags TAGS cscope*
 978
 979 # clean - Delete most, but leave enough to build external modules
 980 #
 981 clean: rm-dirs  := $(CLEAN_DIRS)
 982 clean: rm-files := $(CLEAN_FILES)
 983 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
 984
 985 .PHONY: $(clean-dirs) clean archclean
 986 $(clean-dirs):
 987         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 988
 989 clean: archclean $(clean-dirs)
 990         $(call cmd,rmdirs)
 991         $(call cmd,rmfiles)
 992         @find . $(RCS_FIND_IGNORE) \
 993                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 994                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 995                 -type f -print | xargs rm -f
 996
 997 # mrproper - Delete all generated files, including .config
 998 #
 999 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1000 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1001 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1002
1003 .PHONY: $(mrproper-dirs) mrproper archmrproper
1004 $(mrproper-dirs):
1005         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1006
1007 mrproper: clean archmrproper $(mrproper-dirs)
1008         $(call cmd,rmdirs)
1009         $(call cmd,rmfiles)
1010
1011 # distclean
1012 #
1013 .PHONY: distclean
1014
1015 distclean: mrproper
1016         @find $(srctree) $(RCS_FIND_IGNORE) \
1017                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1018                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1019                 -o -name '.*.rej' -o -size 0 \
1020                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1021                 -type f -print | xargs rm -f
1022
1023
1024 # Packaging of the kernel to various formats
1025 # ---------------------------------------------------------------------------
1026 # rpm target kept for backward compatibility
1027 package-dir     := $(srctree)/scripts/package
1028
1029 .PHONY: %-pkg rpm
1030
1031 %pkg: FORCE
1032         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1033 rpm: FORCE
1034         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1035
1036
1037 # Brief documentation of the typical targets used
1038 # ---------------------------------------------------------------------------
1039
1040 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1041 boards := $(notdir $(boards))
1042
1043 help:
1044         @echo  'Cleaning targets:'
1045         @echo  '  clean           - remove most generated files but keep the config'
1046         @echo  '  mrproper        - remove all generated files + config + various backup files'
1047         @echo  ''
1048         @echo  'Configuration targets:'
1049         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1050         @echo  ''
1051         @echo  'Other generic targets:'
1052         @echo  '  all             - Build all targets marked with [*]'
1053         @echo  '* vmlinux         - Build the bare kernel'
1054         @echo  '* modules         - Build all modules'
1055         @echo  '  modules_install - Install all modules'
1056         @echo  '  dir/            - Build all files in dir and below'
1057         @echo  '  dir/file.[ois]  - Build specified target only'
1058         @echo  '  dir/file.ko     - Build module including final link'
1059         @echo  '  rpm             - Build a kernel as an RPM package'
1060         @echo  '  tags/TAGS       - Generate tags file for editors'
1061         @echo  '  cscope          - Generate cscope index'
1062         @echo  '  kernelrelease   - Output the release version string'
1063         @echo  ''
1064         @echo  'Static analysers'
1065         @echo  '  buildcheck      - List dangling references to vmlinux discarded sections'
1066         @echo  '                    and init sections from non-init sections'
1067         @echo  '  checkstack      - Generate a list of stack hogs'
1068         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1069         @echo  ''
1070         @echo  'Kernel packaging:'
1071         @$(MAKE) -f $(package-dir)/Makefile help
1072         @echo  ''
1073         @echo  'Documentation targets:'
1074         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1075         @echo  ''
1076         @echo  'Architecture specific targets ($(ARCH)):'
1077         @$(if $(archhelp),$(archhelp),\
1078                 echo '  No architecture specific help defined for $(ARCH)')
1079         @echo  ''
1080         @$(if $(boards), \
1081                 $(foreach b, $(boards), \
1082                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1083                 echo '')
1084
1085         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1086         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1087         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1088         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1089         @echo  ''
1090         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1091         @echo  'For further info see the ./README file'
1092
1093
1094 # Documentation targets
1095 # ---------------------------------------------------------------------------
1096 %docs: scripts_basic FORCE
1097         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1098
1099 else # KBUILD_EXTMOD
1100
1101 ###
1102 # External module support.
1103 # When building external modules the kernel used as basis is considered
1104 # read-only, and no consistency checks are made and the make
1105 # system is not used on the basis kernel. If updates are required
1106 # in the basis kernel ordinary make commands (without M=...) must
1107 # be used.
1108 #
1109 # The following are the only valid targets when building external
1110 # modules.
1111 # make M=dir clean     Delete all automatically generated files
1112 # make M=dir modules   Make all modules in specified dir
1113 # make M=dir           Same as 'make M=dir modules'
1114 # make M=dir modules_install
1115 #                      Install the modules build in the module directory
1116 #                      Assumes install directory is already created
1117
1118 # We are always building modules
1119 KBUILD_MODULES := 1
1120 .PHONY: crmodverdir
1121 crmodverdir:
1122         $(Q)mkdir -p $(MODVERDIR)
1123
1124 .PHONY: $(objtree)/Module.symvers
1125 $(objtree)/Module.symvers:
1126         @test -e $(objtree)/Module.symvers || ( \
1127         echo; \
1128         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1129         echo "           is missing; modules will have no dependencies and modversions."; \
1130         echo )
1131
1132 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1133 .PHONY: $(module-dirs) modules
1134 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1135         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1136
1137 modules: $(module-dirs)
1138         @echo '  Building modules, stage 2.';
1139         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1140
1141 .PHONY: modules_install
1142 modules_install:
1143         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1144
1145 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1146
1147 .PHONY: $(clean-dirs) clean
1148 $(clean-dirs):
1149         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1150
1151 clean:  rm-dirs := $(MODVERDIR)
1152 clean: $(clean-dirs)
1153         $(call cmd,rmdirs)
1154         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1155                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1156                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1157                 -type f -print | xargs rm -f
1158
1159 help:
1160         @echo  '  Building external modules.'
1161         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1162         @echo  ''
1163         @echo  '  modules         - default target, build the module(s)'
1164         @echo  '  modules_install - install the module'
1165         @echo  '  clean           - remove generated files in module directory only'
1166         @echo  ''
1167 endif # KBUILD_EXTMOD
1168
1169 # Generate tags for editors
1170 # ---------------------------------------------------------------------------
1171
1172 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1173 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1174 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1175
1176 ifeq ($(src),$(obj))
1177 __srctree =
1178 else
1179 __srctree = $(srctree)/
1180 endif
1181
1182 ALLSOURCE_ARCHS := $(ARCH)
1183
1184 define all-sources
1185         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1186                \( -name include -o -name arch \) -prune -o \
1187                -name '*.[chS]' -print; \
1188           for ARCH in $(ALLSOURCE_ARCHS) ; do \
1189                find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1190                     -name '*.[chS]' -print; \
1191           done ; \
1192           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1193                -name '*.[chS]' -print; \
1194           find $(__srctree)include $(RCS_FIND_IGNORE) \
1195                \( -name config -o -name 'asm-*' \) -prune \
1196                -o -name '*.[chS]' -print; \
1197           for ARCH in $(ALLSOURCE_ARCHS) ; do \
1198                find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1199                     -name '*.[chS]' -print; \
1200           done ; \
1201           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1202                -name '*.[chS]' -print )
1203 endef
1204
1205 quiet_cmd_cscope-file = FILELST cscope.files
1206       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1207
1208 quiet_cmd_cscope = MAKE    cscope.out
1209       cmd_cscope = cscope -b
1210
1211 cscope: FORCE
1212         $(call cmd,cscope-file)
1213         $(call cmd,cscope)
1214
1215 quiet_cmd_TAGS = MAKE   $@
1216 define cmd_TAGS
1217         rm -f $@; \
1218         ETAGSF=`etags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL --extra=+f"`; \
1219         $(all-sources) | xargs etags $$ETAGSF -a
1220 endef
1221
1222 TAGS: FORCE
1223         $(call cmd,TAGS)
1224
1225
1226 quiet_cmd_tags = MAKE   $@
1227 define cmd_tags
1228         rm -f $@; \
1229         CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL --extra=+f"`; \
1230         $(all-sources) | xargs ctags $$CTAGSF -a
1231 endef
1232
1233 tags: FORCE
1234         $(call cmd,tags)
1235
1236
1237 # Scripts to check various things for consistency
1238 # ---------------------------------------------------------------------------
1239
1240 configcheck:
1241         find * $(RCS_FIND_IGNORE) \
1242                 -name '*.[hcS]' -type f -print | sort \
1243                 | xargs $(PERL) -w scripts/checkconfig.pl
1244
1245 includecheck:
1246         find * $(RCS_FIND_IGNORE) \
1247                 -name '*.[hcS]' -type f -print | sort \
1248                 | xargs $(PERL) -w scripts/checkincludes.pl
1249
1250 versioncheck:
1251         find * $(RCS_FIND_IGNORE) \
1252                 -name '*.[hcS]' -type f -print | sort \
1253                 | xargs $(PERL) -w scripts/checkversion.pl
1254
1255 buildcheck:
1256         $(PERL) $(srctree)/scripts/reference_discarded.pl
1257         $(PERL) $(srctree)/scripts/reference_init.pl
1258
1259 namespacecheck:
1260         $(PERL) $(srctree)/scripts/namespace.pl
1261
1262 endif #ifeq ($(config-targets),1)
1263 endif #ifeq ($(mixed-targets),1)
1264
1265 .PHONY: checkstack
1266 checkstack:
1267         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1268         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1269
1270 kernelrelease:
1271         @echo $(KERNELRELEASE)
1272
1273 # FIXME Should go into a make.lib or something
1274 # ===========================================================================
1275
1276 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1277       cmd_rmdirs = rm -rf $(rm-dirs)
1278
1279 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1280       cmd_rmfiles = rm -f $(rm-files)
1281
1282
1283 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1284           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1285           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1286
1287 quiet_cmd_as_o_S = AS      $@
1288 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1289
1290 # read all saved command lines
1291
1292 targets := $(wildcard $(sort $(targets)))
1293 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1294
1295 ifneq ($(cmd_files),)
1296   $(cmd_files): ;       # Do not try to update included dependency files
1297   include $(cmd_files)
1298 endif
1299
1300 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1301 # Usage:
1302 # $(Q)$(MAKE) $(clean)=dir
1303 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1304
1305 endif   # skip-makefile
1306
1307 FORCE: