Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 17
   4 EXTRAVERSION =
   5 NAME=Crazed Snow-Weasel
   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 = $(V)
  38   endif
  39 endif
  40 ifndef KBUILD_VERBOSE
  41   KBUILD_VERBOSE = 0
  42 endif
  43
  44 # Call checker as part of compilation of C files
  45 # Use 'make C=1' to enable checking (sparse, by default)
  46 # Override with 'make C=1 CHECK=checker_executable CHECKFLAGS=....'
  47
  48 ifdef C
  49   ifeq ("$(origin C)", "command line")
  50     KBUILD_CHECKSRC = $(C)
  51   endif
  52 endif
  53 ifndef KBUILD_CHECKSRC
  54   KBUILD_CHECKSRC = 0
  55 endif
  56
  57 # Use make M=dir to specify directory of external module to build
  58 # Old syntax make ... SUBDIRS=$PWD is still supported
  59 # Setting the environment variable KBUILD_EXTMOD take precedence
  60 ifdef SUBDIRS
  61   KBUILD_EXTMOD ?= $(SUBDIRS)
  62 endif
  63 ifdef M
  64   ifeq ("$(origin M)", "command line")
  65     KBUILD_EXTMOD := $(M)
  66   endif
  67 endif
  68
  69
  70 # kbuild supports saving output files in a separate directory.
  71 # To locate output files in a separate directory two syntaxes are supported.
  72 # In both cases the working directory must be the root of the kernel src.
  73 # 1) O=
  74 # Use "make O=dir/to/store/output/files/"
  75 #
  76 # 2) Set KBUILD_OUTPUT
  77 # Set the environment variable KBUILD_OUTPUT to point to the directory
  78 # where the output files shall be placed.
  79 # export KBUILD_OUTPUT=dir/to/store/output/files/
  80 # make
  81 #
  82 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  83 # variable.
  84
  85
  86 # KBUILD_SRC is set on invocation of make in OBJ directory
  87 # KBUILD_SRC is not intended to be used by the regular user (for now)
  88 ifeq ($(KBUILD_SRC),)
  89
  90 # OK, Make called in directory where kernel src resides
  91 # Do we want to locate output files in a separate directory?
  92 ifdef O
  93   ifeq ("$(origin O)", "command line")
  94     KBUILD_OUTPUT := $(O)
  95   endif
  96 endif
  97
  98 # That's our default target when none is given on the command line
  99 PHONY := _all
 100 _all:
 101
 102 ifneq ($(KBUILD_OUTPUT),)
 103 # Invoke a second make in the output directory, passing relevant variables
 104 # check that the output directory actually exists
 105 saved-output := $(KBUILD_OUTPUT)
 106 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 107 $(if $(KBUILD_OUTPUT),, \
 108      $(error output directory "$(saved-output)" does not exist))
 109
 110 PHONY += $(MAKECMDGOALS)
 111
 112 $(filter-out _all,$(MAKECMDGOALS)) _all:
 113         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 114         KBUILD_SRC=$(CURDIR) \
 115         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
 116
 117 # Leave processing to above invocation of make
 118 skip-makefile := 1
 119 endif # ifneq ($(KBUILD_OUTPUT),)
 120 endif # ifeq ($(KBUILD_SRC),)
 121
 122 # We process the rest of the Makefile if this is the final invocation of make
 123 ifeq ($(skip-makefile),)
 124
 125 # If building an external module we do not care about the all: rule
 126 # but instead _all depend on modules
 127 PHONY += all
 128 ifeq ($(KBUILD_EXTMOD),)
 129 _all: all
 130 else
 131 _all: modules
 132 endif
 133
 134 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 135 TOPDIR          := $(srctree)
 136 # FIXME - TOPDIR is obsolete, use srctree/objtree
 137 objtree         := $(CURDIR)
 138 src             := $(srctree)
 139 obj             := $(objtree)
 140
 141 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 142
 143 export srctree objtree VPATH TOPDIR
 144
 145
 146 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 147 # first, and if a usermode build is happening, the "ARCH=um" on the command
 148 # line overrides the setting of ARCH below.  If a native build is happening,
 149 # then ARCH is assigned, getting whatever value it gets normally, and
 150 # SUBARCH is subsequently ignored.
 151
 152 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 153                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 154                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 155                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
 156
 157 # Cross compiling and selecting different set of gcc/bin-utils
 158 # ---------------------------------------------------------------------------
 159 #
 160 # When performing cross compilation for other architectures ARCH shall be set
 161 # to the target architecture. (See arch/* for the possibilities).
 162 # ARCH can be set during invocation of make:
 163 # make ARCH=ia64
 164 # Another way is to have ARCH set in the environment.
 165 # The default ARCH is the host where make is executed.
 166
 167 # CROSS_COMPILE specify the prefix used for all executables used
 168 # during compilation. Only gcc and related bin-utils executables
 169 # are prefixed with $(CROSS_COMPILE).
 170 # CROSS_COMPILE can be set on the command line
 171 # make CROSS_COMPILE=ia64-linux-
 172 # Alternatively CROSS_COMPILE can be set in the environment.
 173 # Default value for CROSS_COMPILE is not to prefix executables
 174 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 175
 176 ARCH            ?= $(SUBARCH)
 177 CROSS_COMPILE   ?=
 178
 179 # Architecture as present in compile.h
 180 UTS_MACHINE := $(ARCH)
 181
 182 KCONFIG_CONFIG  ?= .config
 183
 184 # SHELL used by kbuild
 185 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 186           else if [ -x /bin/bash ]; then echo /bin/bash; \
 187           else echo sh; fi ; fi)
 188
 189 HOSTCC       = gcc
 190 HOSTCXX      = g++
 191 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 192 HOSTCXXFLAGS = -O2
 193
 194 # Decide whether to build built-in, modular, or both.
 195 # Normally, just do built-in.
 196
 197 KBUILD_MODULES :=
 198 KBUILD_BUILTIN := 1
 199
 200 #       If we have only "make modules", don't compile built-in objects.
 201 #       When we're building modules with modversions, we need to consider
 202 #       the built-in objects during the descend as well, in order to
 203 #       make sure the checksums are up to date before we record them.
 204
 205 ifeq ($(MAKECMDGOALS),modules)
 206   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 207 endif
 208
 209 #       If we have "make <whatever> modules", compile modules
 210 #       in addition to whatever we do anyway.
 211 #       Just "make" or "make all" shall build modules as well
 212
 213 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 214   KBUILD_MODULES := 1
 215 endif
 216
 217 ifeq ($(MAKECMDGOALS),)
 218   KBUILD_MODULES := 1
 219 endif
 220
 221 export KBUILD_MODULES KBUILD_BUILTIN
 222 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 223
 224 # Beautify output
 225 # ---------------------------------------------------------------------------
 226 #
 227 # Normally, we echo the whole command before executing it. By making
 228 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 229 # $(quiet) to choose other forms of output instead, e.g.
 230 #
 231 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 232 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 233 #
 234 # If $(quiet) is empty, the whole command will be printed.
 235 # If it is set to "quiet_", only the short version will be printed.
 236 # If it is set to "silent_", nothing will be printed at all, since
 237 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 238 #
 239 # A simple variant is to prefix commands with $(Q) - that's useful
 240 # for commands that shall be hidden in non-verbose mode.
 241 #
 242 #       $(Q)ln $@ :<
 243 #
 244 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 245 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 246
 247 ifeq ($(KBUILD_VERBOSE),1)
 248   quiet =
 249   Q =
 250 else
 251   quiet=quiet_
 252   Q = @
 253 endif
 254
 255 # If the user is running make -s (silent mode), suppress echoing of
 256 # commands
 257
 258 ifneq ($(findstring s,$(MAKEFLAGS)),)
 259   quiet=silent_
 260 endif
 261
 262 export quiet Q KBUILD_VERBOSE
 263
 264
 265 # Look for make include files relative to root of kernel src
 266 MAKEFLAGS += --include-dir=$(srctree)
 267
 268 # We need some generic definitions
 269 include  $(srctree)/scripts/Kbuild.include
 270
 271 # Do not use make's built-in rules and variables
 272 # This increases performance and avoid hard-to-debug behavour
 273 MAKEFLAGS += -rR
 274
 275 # Make variables (CC, etc...)
 276
 277 AS              = $(CROSS_COMPILE)as
 278 LD              = $(CROSS_COMPILE)ld
 279 CC              = $(CROSS_COMPILE)gcc
 280 CPP             = $(CC) -E
 281 AR              = $(CROSS_COMPILE)ar
 282 NM              = $(CROSS_COMPILE)nm
 283 STRIP           = $(CROSS_COMPILE)strip
 284 OBJCOPY         = $(CROSS_COMPILE)objcopy
 285 OBJDUMP         = $(CROSS_COMPILE)objdump
 286 AWK             = awk
 287 GENKSYMS        = scripts/genksyms/genksyms
 288 DEPMOD          = /sbin/depmod
 289 KALLSYMS        = scripts/kallsyms
 290 PERL            = perl
 291 CHECK           = sparse
 292
 293 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 294 MODFLAGS        = -DMODULE
 295 CFLAGS_MODULE   = $(MODFLAGS)
 296 AFLAGS_MODULE   = $(MODFLAGS)
 297 LDFLAGS_MODULE  = -r
 298 CFLAGS_KERNEL   =
 299 AFLAGS_KERNEL   =
 300
 301
 302 # Use LINUXINCLUDE when you must reference the include/ directory.
 303 # Needed to be compatible with the O= option
 304 LINUXINCLUDE    := -Iinclude \
 305                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 306                    -include include/linux/autoconf.h
 307
 308 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 309
 310 CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 311                    -fno-strict-aliasing -fno-common
 312 # Force gcc to behave correct even for buggy distributions
 313 CFLAGS          += $(call cc-option, -fno-stack-protector-all \
 314                                      -fno-stack-protector)
 315 AFLAGS          := -D__ASSEMBLY__
 316
 317 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 318 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 319 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 320
 321 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 322 export ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 323 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 324 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 325
 326 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 327 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 328 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 329
 330 # When compiling out-of-tree modules, put MODVERDIR in the module
 331 # tree rather than in the kernel tree. The kernel tree might
 332 # even be read-only.
 333 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 334
 335 # Files to ignore in find ... statements
 336
 337 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
 338 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 339
 340 # ===========================================================================
 341 # Rules shared between *config targets and build targets
 342
 343 # Basic helpers built in scripts/
 344 PHONY += scripts_basic
 345 scripts_basic:
 346         $(Q)$(MAKE) $(build)=scripts/basic
 347
 348 # To avoid any implicit rule to kick in, define an empty command.
 349 scripts/basic/%: scripts_basic ;
 350
 351 PHONY += outputmakefile
 352 # outputmakefile generates a Makefile in the output directory, if using a
 353 # separate output directory. This allows convenient use of make in the
 354 # output directory.
 355 outputmakefile:
 356 ifneq ($(KBUILD_SRC),)
 357         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 358             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 359 endif
 360
 361 # To make sure we do not include .config for any of the *config targets
 362 # catch them early, and hand them over to scripts/kconfig/Makefile
 363 # It is allowed to specify more targets when calling make, including
 364 # mixing *config targets and build targets.
 365 # For example 'make oldconfig all'.
 366 # Detect when mixed targets is specified, and make a second invocation
 367 # of make so .config is not included in this case either (for *config).
 368
 369 no-dot-config-targets := clean mrproper distclean \
 370                          cscope TAGS tags help %docs check% \
 371                          kernelrelease kernelversion
 372
 373 config-targets := 0
 374 mixed-targets  := 0
 375 dot-config     := 1
 376
 377 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 378         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 379                 dot-config := 0
 380         endif
 381 endif
 382
 383 ifeq ($(KBUILD_EXTMOD),)
 384         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 385                 config-targets := 1
 386                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 387                         mixed-targets := 1
 388                 endif
 389         endif
 390 endif
 391
 392 ifeq ($(mixed-targets),1)
 393 # ===========================================================================
 394 # We're called with mixed targets (*config and build targets).
 395 # Handle them one by one.
 396
 397 %:: FORCE
 398         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 399
 400 else
 401 ifeq ($(config-targets),1)
 402 # ===========================================================================
 403 # *config targets only - make sure prerequisites are updated, and descend
 404 # in scripts/kconfig to make the *config target
 405
 406 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 407 # KBUILD_DEFCONFIG may point out an alternative default configuration
 408 # used for 'make defconfig'
 409 include $(srctree)/arch/$(ARCH)/Makefile
 410 export KBUILD_DEFCONFIG
 411
 412 config %config: scripts_basic outputmakefile FORCE
 413         $(Q)mkdir -p include/linux include/config
 414         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 415
 416 else
 417 # ===========================================================================
 418 # Build targets only - this includes vmlinux, arch specific targets, clean
 419 # targets and others. In general all targets except *config targets.
 420
 421 ifeq ($(KBUILD_EXTMOD),)
 422 # Additional helpers built in scripts/
 423 # Carefully list dependencies so we do not try to build scripts twice
 424 # in parallel
 425 PHONY += scripts
 426 scripts: scripts_basic include/config/auto.conf
 427         $(Q)$(MAKE) $(build)=$(@)
 428
 429 # Objects we will link into vmlinux / subdirs we need to visit
 430 init-y          := init/
 431 drivers-y       := drivers/ sound/
 432 net-y           := net/
 433 libs-y          := lib/
 434 core-y          := usr/
 435 endif # KBUILD_EXTMOD
 436
 437 ifeq ($(dot-config),1)
 438 # In this section, we need .config
 439
 440 # Read in dependencies to all Kconfig* files, make sure to run
 441 # oldconfig if changes are detected.
 442 -include include/config/auto.conf.cmd
 443 -include include/config/auto.conf
 444
 445 # To avoid any implicit rule to kick in, define an empty command
 446 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 447
 448 # If .config is newer than include/config/auto.conf, someone tinkered
 449 # with it and forgot to run make oldconfig.
 450 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 451 # we execute the config step to be sure to catch updated Kconfig files
 452 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 453 ifeq ($(KBUILD_EXTMOD),)
 454         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 455 else
 456         $(error kernel configuration not valid - run 'make prepare' in $(srctree) to update it)
 457 endif
 458
 459 else
 460 # Dummy target needed, because used as prerequisite
 461 include/config/auto.conf: ;
 462 endif
 463
 464 # The all: target is the default when no target is given on the
 465 # command line.
 466 # This allow a user to issue only 'make' to build a kernel including modules
 467 # Defaults vmlinux but it is usually overridden in the arch makefile
 468 all: vmlinux
 469
 470 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 471 CFLAGS          += -Os
 472 else
 473 CFLAGS          += -O2
 474 endif
 475
 476 ifdef CONFIG_FRAME_POINTER
 477 CFLAGS          += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 478 else
 479 CFLAGS          += -fomit-frame-pointer
 480 endif
 481
 482 ifdef CONFIG_UNWIND_INFO
 483 CFLAGS          += -fasynchronous-unwind-tables
 484 endif
 485
 486 ifdef CONFIG_DEBUG_INFO
 487 CFLAGS          += -g
 488 endif
 489
 490 include $(srctree)/arch/$(ARCH)/Makefile
 491
 492 # arch Makefile may override CC so keep this after arch Makefile is included
 493 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 494 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 495
 496 # warn about C99 declaration after statement
 497 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 498
 499 # disable pointer signed / unsigned warnings in gcc 4.0
 500 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 501
 502 # Default kernel image to build when no specific target is given.
 503 # KBUILD_IMAGE may be overruled on the command line or
 504 # set in the environment
 505 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 506 # this default value
 507 export KBUILD_IMAGE ?= vmlinux
 508
 509 #
 510 # INSTALL_PATH specifies where to place the updated kernel and system map
 511 # images. Default is /boot, but you can set it to other values
 512 export  INSTALL_PATH ?= /boot
 513
 514 #
 515 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 516 # relocations required by build roots.  This is not defined in the
 517 # makefile but the argument can be passed to make if needed.
 518 #
 519
 520 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 521 export MODLIB
 522
 523 #
 524 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 525 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 526 #  the default option --strip-debug will be used.  Otherwise,
 527 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 528
 529 ifdef INSTALL_MOD_STRIP
 530 ifeq ($(INSTALL_MOD_STRIP),1)
 531 mod_strip_cmd = $STRIP) --strip-debug
 532 else
 533 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 534 endif # INSTALL_MOD_STRIP=1
 535 else
 536 mod_strip_cmd = true
 537 endif # INSTALL_MOD_STRIP
 538 export mod_strip_cmd
 539
 540
 541 ifeq ($(KBUILD_EXTMOD),)
 542 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 543
 544 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 545                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 546                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 547
 548 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 549                      $(init-n) $(init-) \
 550                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 551                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 552
 553 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 554 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 555 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 556 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 557 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 558 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 559 libs-y          := $(libs-y1) $(libs-y2)
 560
 561 # Build vmlinux
 562 # ---------------------------------------------------------------------------
 563 # vmlinux is built from the objects selected by $(vmlinux-init) and
 564 # $(vmlinux-main). Most are built-in.o files from top-level directories
 565 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 566 # Ordering when linking is important, and $(vmlinux-init) must be first.
 567 #
 568 # vmlinux
 569 #   ^
 570 #   |
 571 #   +-< $(vmlinux-init)
 572 #   |   +--< init/version.o + more
 573 #   |
 574 #   +--< $(vmlinux-main)
 575 #   |    +--< driver/built-in.o mm/built-in.o + more
 576 #   |
 577 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 578 #
 579 # vmlinux version (uname -v) cannot be updated during normal
 580 # descending-into-subdirs phase since we do not yet know if we need to
 581 # update vmlinux.
 582 # Therefore this step is delayed until just before final link of vmlinux -
 583 # except in the kallsyms case where it is done just before adding the
 584 # symbols to the kernel.
 585 #
 586 # System.map is generated to document addresses of all kernel symbols
 587
 588 vmlinux-init := $(head-y) $(init-y)
 589 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 590 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 591 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 592
 593 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 594 # May be overridden by arch/$(ARCH)/Makefile
 595 quiet_cmd_vmlinux__ ?= LD      $@
 596       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 597       -T $(vmlinux-lds) $(vmlinux-init)                          \
 598       --start-group $(vmlinux-main) --end-group                  \
 599       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 600
 601 # Generate new vmlinux version
 602 quiet_cmd_vmlinux_version = GEN     .version
 603       cmd_vmlinux_version = set -e;                     \
 604         if [ ! -r .version ]; then                      \
 605           rm -f .version;                               \
 606           echo 1 >.version;                             \
 607         else                                            \
 608           mv .version .old_version;                     \
 609           expr 0$$(cat .old_version) + 1 >.version;     \
 610         fi;                                             \
 611         $(MAKE) $(build)=init
 612
 613 # Generate System.map
 614 quiet_cmd_sysmap = SYSMAP
 615       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 616
 617 # Link of vmlinux
 618 # If CONFIG_KALLSYMS is set .version is already updated
 619 # Generate System.map and verify that the content is consistent
 620 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 621 # First command is ':' to allow us to use + in front of the rule
 622 define rule_vmlinux__
 623         :
 624         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 625
 626         $(call cmd,vmlinux__)
 627         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 628
 629         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 630           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 631         $(cmd_sysmap) $@ System.map;                    \
 632         if [ $$? -ne 0 ]; then                          \
 633                 rm -f $@;                               \
 634                 /bin/false;                             \
 635         fi;
 636         $(verify_kallsyms)
 637 endef
 638
 639
 640 ifdef CONFIG_KALLSYMS
 641 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 642 # It's a three stage process:
 643 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 644 #   empty
 645 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 646 #   the right size - vmlinux version (uname -v) is updated during this step
 647 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 648 #   but due to the added section, some addresses have shifted.
 649 #   From here, we generate a correct .tmp_kallsyms2.o
 650 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 651 # o Verify that the System.map from vmlinux matches the map from
 652 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 653 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 654 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 655 #   temporary bypass to allow the kernel to be built while the
 656 #   maintainers work out what went wrong with kallsyms.
 657
 658 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 659 last_kallsyms := 3
 660 else
 661 last_kallsyms := 2
 662 endif
 663
 664 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 665
 666 define verify_kallsyms
 667         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 668           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 669           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 670         $(Q)cmp -s System.map .tmp_System.map ||              \
 671                 (echo Inconsistent kallsyms data;             \
 672                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 673                  rm .tmp_kallsyms* ; /bin/false )
 674 endef
 675
 676 # Update vmlinux version before link
 677 # Use + in front of this rule to silent warning about make -j1
 678 # First command is ':' to allow us to use + in front of this rule
 679 cmd_ksym_ld = $(cmd_vmlinux__)
 680 define rule_ksym_ld
 681         :
 682         +$(call cmd,vmlinux_version)
 683         $(call cmd,vmlinux__)
 684         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 685 endef
 686
 687 # Generate .S file with all kernel symbols
 688 quiet_cmd_kallsyms = KSYM    $@
 689       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 690                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 691
 692 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 693         $(call if_changed_dep,as_o_S)
 694
 695 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 696         $(call cmd,kallsyms)
 697
 698 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 699 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 700         $(call if_changed_rule,ksym_ld)
 701
 702 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 703         $(call if_changed,vmlinux__)
 704
 705 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 706         $(call if_changed,vmlinux__)
 707
 708 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 709 $(KALLSYMS): scripts ;
 710
 711 # Generate some data for debugging strange kallsyms problems
 712 debug_kallsyms: .tmp_map$(last_kallsyms)
 713
 714 .tmp_map%: .tmp_vmlinux% FORCE
 715         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 716
 717 .tmp_map3: .tmp_map2
 718
 719 .tmp_map2: .tmp_map1
 720
 721 endif # ifdef CONFIG_KALLSYMS
 722
 723 # vmlinux image - including updated kernel symbols
 724 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 725         $(call if_changed_rule,vmlinux__)
 726         $(Q)rm -f .old_version
 727
 728 # The actual objects are generated when descending,
 729 # make sure no implicit rule kicks in
 730 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 731
 732 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 733 # Preset locale variables to speed up the build process. Limit locale
 734 # tweaks to this spot to avoid wrong language settings when running
 735 # make menuconfig etc.
 736 # Error messages still appears in the original language
 737
 738 PHONY += $(vmlinux-dirs)
 739 $(vmlinux-dirs): prepare scripts
 740         $(Q)$(MAKE) $(build)=$@
 741
 742 # Build the kernel release string
 743 # The KERNELRELEASE is stored in a file named include/config/kernel.release
 744 # to be used when executing for example make install or make modules_install
 745 #
 746 # Take the contents of any files called localversion* and the config
 747 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
 748 # LOCALVERSION from the command line override all of this
 749
 750 nullstring :=
 751 space      := $(nullstring) # end of line
 752
 753 ___localver = $(objtree)/localversion* $(srctree)/localversion*
 754 __localver  = $(sort $(wildcard $(___localver)))
 755 # skip backup files (containing '~')
 756 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
 757
 758 localver = $(subst $(space),, \
 759            $(shell cat /dev/null $(_localver)) \
 760            $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 761
 762 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 763 # and if the SCM is know a tag from the SCM is appended.
 764 # The appended tag is determined by the SCM used.
 765 #
 766 # Currently, only git is supported.
 767 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 768 # checks as needed.
 769 ifdef CONFIG_LOCALVERSION_AUTO
 770         _localver-auto = $(shell $(CONFIG_SHELL) \
 771                           $(srctree)/scripts/setlocalversion $(srctree))
 772         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 773 endif
 774
 775 localver-full = $(localver)$(localver-auto)
 776
 777 # Store (new) KERNELRELASE string in include/config/kernel.release
 778 kernelrelease = $(KERNELVERSION)$(localver-full)
 779 include/config/kernel.release: include/config/auto.conf FORCE
 780         $(Q)rm -f $@
 781         $(Q)echo $(kernelrelease) > $@
 782
 783
 784 # Things we need to do before we recursively start building the kernel
 785 # or the modules are listed in "prepare".
 786 # A multi level approach is used. prepareN is processed before prepareN-1.
 787 # archprepare is used in arch Makefiles and when processed asm symlink,
 788 # version.h and scripts_basic is processed / created.
 789
 790 # Listed in dependency order
 791 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 792
 793 # prepare-all is deprecated, use prepare as valid replacement
 794 PHONY += prepare-all
 795
 796 # prepare3 is used to check if we are building in a separate output directory,
 797 # and if so do:
 798 # 1) Check that make has not been executed in the kernel src $(srctree)
 799 # 2) Create the include2 directory, used for the second asm symlink
 800 prepare3: include/config/kernel.release
 801 ifneq ($(KBUILD_SRC),)
 802         @echo '  Using $(srctree) as source for kernel'
 803         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 804                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 805                 echo "  in the '$(srctree)' directory.";\
 806                 /bin/false; \
 807         fi;
 808         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 809         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 810 endif
 811
 812 # prepare2 creates a makefile if using a separate output directory
 813 prepare2: prepare3 outputmakefile
 814
 815 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 816                    include/asm include/config/auto.conf
 817 ifneq ($(KBUILD_MODULES),)
 818         $(Q)mkdir -p $(MODVERDIR)
 819         $(Q)rm -f $(MODVERDIR)/*
 820 endif
 821
 822 archprepare: prepare1 scripts_basic
 823
 824 prepare0: archprepare FORCE
 825         $(Q)$(MAKE) $(build)=.
 826
 827 # All the preparing..
 828 prepare prepare-all: prepare0
 829
 830 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 831 # done in arch/$(ARCH)/kernel/Makefile
 832
 833 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 834
 835 # FIXME: The asm symlink changes when $(ARCH) changes. That's
 836 # hard to detect, but I suppose "make mrproper" is a good idea
 837 # before switching between archs anyway.
 838
 839 include/asm:
 840         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 841         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 842         @ln -fsn asm-$(ARCH) $@
 843
 844 # Generate some files
 845 # ---------------------------------------------------------------------------
 846
 847 # KERNELRELEASE can change from a few different places, meaning version.h
 848 # needs to be updated, so this check is forced on all builds
 849
 850 uts_len := 64
 851 define filechk_utsrelease.h
 852         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 853           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 854           exit 1;                                                         \
 855         fi;                                                               \
 856         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 857 endef
 858
 859 define filechk_version.h
 860         (echo \#define LINUX_VERSION_CODE $(shell                             \
 861         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 862         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 863 endef
 864
 865 include/linux/version.h: $(srctree)/Makefile FORCE
 866         $(call filechk,version.h)
 867
 868 include/linux/utsrelease.h: include/config/kernel.release FORCE
 869         $(call filechk,utsrelease.h)
 870
 871 # ---------------------------------------------------------------------------
 872
 873 PHONY += depend dep
 874 depend dep:
 875         @echo '*** Warning: make $@ is unnecessary now.'
 876
 877 # ---------------------------------------------------------------------------
 878 # Kernel headers
 879 INSTALL_HDR_PATH=$(MODLIB)/abi
 880 export INSTALL_HDR_PATH
 881
 882 PHONY += headers_install
 883 headers_install: include/linux/version.h
 884         $(Q)unifdef -Ux /dev/null
 885         $(Q)rm -rf $(INSTALL_HDR_PATH)/include
 886         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.headersinst obj=include
 887
 888 PHONY += headers_check
 889 headers_check: headers_install
 890         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.headersinst obj=include HDRCHECK=1
 891
 892 # ---------------------------------------------------------------------------
 893 # Modules
 894
 895 ifdef CONFIG_MODULES
 896
 897 # By default, build modules as well
 898
 899 all: modules
 900
 901 #       Build modules
 902
 903 PHONY += modules
 904 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 905         @echo '  Building modules, stage 2.';
 906         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 907
 908
 909 # Target to prepare building external modules
 910 PHONY += modules_prepare
 911 modules_prepare: prepare scripts
 912
 913 # Target to install modules
 914 PHONY += modules_install
 915 modules_install: _modinst_ _modinst_post
 916
 917 PHONY += _modinst_
 918 _modinst_:
 919         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 920                 echo "Warning: you may need to install module-init-tools"; \
 921                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 922                 sleep 1; \
 923         fi
 924         @rm -rf $(MODLIB)/kernel
 925         @rm -f $(MODLIB)/source
 926         @mkdir -p $(MODLIB)/kernel
 927         @ln -s $(srctree) $(MODLIB)/source
 928         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 929                 rm -f $(MODLIB)/build ; \
 930                 ln -s $(objtree) $(MODLIB)/build ; \
 931         fi
 932         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 933
 934 # If System.map exists, run depmod.  This deliberately does not have a
 935 # dependency on System.map since that would run the dependency tree on
 936 # vmlinux.  This depmod is only for convenience to give the initial
 937 # boot a modules.dep even before / is mounted read-write.  However the
 938 # boot script depmod is the master version.
 939 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 940 depmod_opts     :=
 941 else
 942 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 943 endif
 944 PHONY += _modinst_post
 945 _modinst_post: _modinst_
 946         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 947
 948 else # CONFIG_MODULES
 949
 950 # Modules not configured
 951 # ---------------------------------------------------------------------------
 952
 953 modules modules_install: FORCE
 954         @echo
 955         @echo "The present kernel configuration has modules disabled."
 956         @echo "Type 'make config' and enable loadable module support."
 957         @echo "Then build a kernel with module support enabled."
 958         @echo
 959         @exit 1
 960
 961 endif # CONFIG_MODULES
 962
 963 ###
 964 # Cleaning is done on three levels.
 965 # make clean     Delete most generated files
 966 #                Leave enough to build external modules
 967 # make mrproper  Delete the current configuration, and all generated files
 968 # make distclean Remove editor backup files, patch leftover files and the like
 969
 970 # Directories & files removed with 'make clean'
 971 CLEAN_DIRS  += $(MODVERDIR)
 972 CLEAN_FILES +=  vmlinux System.map \
 973                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 974
 975 # Directories & files removed with 'make mrproper'
 976 MRPROPER_DIRS  += include/config include2
 977 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
 978                   include/linux/autoconf.h include/linux/version.h      \
 979                   include/linux/utsrelease.h                            \
 980                   Module.symvers tags TAGS cscope*
 981
 982 # clean - Delete most, but leave enough to build external modules
 983 #
 984 clean: rm-dirs  := $(CLEAN_DIRS)
 985 clean: rm-files := $(CLEAN_FILES)
 986 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
 987
 988 PHONY += $(clean-dirs) clean archclean
 989 $(clean-dirs):
 990         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 991
 992 clean: archclean $(clean-dirs)
 993         $(call cmd,rmdirs)
 994         $(call cmd,rmfiles)
 995         @find . $(RCS_FIND_IGNORE) \
 996                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 997                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
 998                 -o -name '*.symtypes' \) \
 999                 -type f -print | xargs rm -f
1000
1001 # mrproper - Delete all generated files, including .config
1002 #
1003 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1004 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1005 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1006
1007 PHONY += $(mrproper-dirs) mrproper archmrproper
1008 $(mrproper-dirs):
1009         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1010
1011 mrproper: clean archmrproper $(mrproper-dirs)
1012         $(call cmd,rmdirs)
1013         $(call cmd,rmfiles)
1014
1015 # distclean
1016 #
1017 PHONY += distclean
1018
1019 distclean: mrproper
1020         @find $(srctree) $(RCS_FIND_IGNORE) \
1021                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1022                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1023                 -o -name '.*.rej' -o -size 0 \
1024                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1025                 -type f -print | xargs rm -f
1026
1027
1028 # Packaging of the kernel to various formats
1029 # ---------------------------------------------------------------------------
1030 # rpm target kept for backward compatibility
1031 package-dir     := $(srctree)/scripts/package
1032
1033 %pkg: include/config/kernel.release FORCE
1034         $(Q)$(MAKE) $(build)=$(package-dir) $@
1035 rpm: include/config/kernel.release FORCE
1036         $(Q)$(MAKE) $(build)=$(package-dir) $@
1037
1038
1039 # Brief documentation of the typical targets used
1040 # ---------------------------------------------------------------------------
1041
1042 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1043 boards := $(notdir $(boards))
1044
1045 help:
1046         @echo  'Cleaning targets:'
1047         @echo  '  clean           - remove most generated files but keep the config'
1048         @echo  '  mrproper        - remove all generated files + config + various backup files'
1049         @echo  ''
1050         @echo  'Configuration targets:'
1051         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1052         @echo  ''
1053         @echo  'Other generic targets:'
1054         @echo  '  all             - Build all targets marked with [*]'
1055         @echo  '* vmlinux         - Build the bare kernel'
1056         @echo  '* modules         - Build all modules'
1057         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1058         @echo  '  dir/            - Build all files in dir and below'
1059         @echo  '  dir/file.[ois]  - Build specified target only'
1060         @echo  '  dir/file.ko     - Build module including final link'
1061         @echo  '  rpm             - Build a kernel as an RPM package'
1062         @echo  '  tags/TAGS       - Generate tags file for editors'
1063         @echo  '  cscope          - Generate cscope index'
1064         @echo  '  kernelrelease   - Output the release version string'
1065         @echo  '  kernelversion   - Output the version stored in Makefile'
1066         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'
1067         @echo  '                    (default: /lib/modules/$$VERSION/abi)'
1068         @echo  ''
1069         @echo  'Static analysers'
1070         @echo  '  checkstack      - Generate a list of stack hogs'
1071         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1072         @echo  ''
1073         @echo  'Kernel packaging:'
1074         @$(MAKE) $(build)=$(package-dir) help
1075         @echo  ''
1076         @echo  'Documentation targets:'
1077         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1078         @echo  ''
1079         @echo  'Architecture specific targets ($(ARCH)):'
1080         @$(if $(archhelp),$(archhelp),\
1081                 echo '  No architecture specific help defined for $(ARCH)')
1082         @echo  ''
1083         @$(if $(boards), \
1084                 $(foreach b, $(boards), \
1085                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1086                 echo '')
1087
1088         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1089         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1090         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1091         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1092         @echo  ''
1093         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1094         @echo  'For further info see the ./README file'
1095
1096
1097 # Documentation targets
1098 # ---------------------------------------------------------------------------
1099 %docs: scripts_basic FORCE
1100         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1101
1102 else # KBUILD_EXTMOD
1103
1104 ###
1105 # External module support.
1106 # When building external modules the kernel used as basis is considered
1107 # read-only, and no consistency checks are made and the make
1108 # system is not used on the basis kernel. If updates are required
1109 # in the basis kernel ordinary make commands (without M=...) must
1110 # be used.
1111 #
1112 # The following are the only valid targets when building external
1113 # modules.
1114 # make M=dir clean     Delete all automatically generated files
1115 # make M=dir modules   Make all modules in specified dir
1116 # make M=dir           Same as 'make M=dir modules'
1117 # make M=dir modules_install
1118 #                      Install the modules built in the module directory
1119 #                      Assumes install directory is already created
1120
1121 # We are always building modules
1122 KBUILD_MODULES := 1
1123 PHONY += crmodverdir
1124 crmodverdir:
1125         $(Q)mkdir -p $(MODVERDIR)
1126         $(Q)rm -f $(MODVERDIR)/*
1127
1128 PHONY += $(objtree)/Module.symvers
1129 $(objtree)/Module.symvers:
1130         @test -e $(objtree)/Module.symvers || ( \
1131         echo; \
1132         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1133         echo "           is missing; modules will have no dependencies and modversions."; \
1134         echo )
1135
1136 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1137 PHONY += $(module-dirs) modules
1138 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1139         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1140
1141 modules: $(module-dirs)
1142         @echo '  Building modules, stage 2.';
1143         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1144
1145 PHONY += modules_install
1146 modules_install: _emodinst_ _emodinst_post
1147
1148 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1149 PHONY += _emodinst_
1150 _emodinst_:
1151         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1152         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1153
1154 # Run depmod only is we have System.map and depmod is executable
1155 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1156       cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1157                       $(DEPMOD) -ae -F System.map             \
1158                       $(if $(strip $(INSTALL_MOD_PATH)),      \
1159                       -b $(INSTALL_MOD_PATH) -r)              \
1160                       $(KERNELRELEASE);                       \
1161                    fi
1162
1163 PHONY += _emodinst_post
1164 _emodinst_post: _emodinst_
1165         $(call cmd,depmod)
1166
1167 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1168
1169 PHONY += $(clean-dirs) clean
1170 $(clean-dirs):
1171         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1172
1173 clean:  rm-dirs := $(MODVERDIR)
1174 clean: $(clean-dirs)
1175         $(call cmd,rmdirs)
1176         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1177                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1178                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1179                 -type f -print | xargs rm -f
1180
1181 help:
1182         @echo  '  Building external modules.'
1183         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1184         @echo  ''
1185         @echo  '  modules         - default target, build the module(s)'
1186         @echo  '  modules_install - install the module'
1187         @echo  '  clean           - remove generated files in module directory only'
1188         @echo  ''
1189
1190 # Dummies...
1191 PHONY += prepare scripts
1192 prepare: ;
1193 scripts: ;
1194 endif # KBUILD_EXTMOD
1195
1196 # Generate tags for editors
1197 # ---------------------------------------------------------------------------
1198
1199 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1200 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1201 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1202
1203 ifeq ($(src),$(obj))
1204 __srctree =
1205 else
1206 __srctree = $(srctree)/
1207 endif
1208
1209 ifeq ($(ALLSOURCE_ARCHS),)
1210 ifeq ($(ARCH),um)
1211 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1212 else
1213 ALLINCLUDE_ARCHS := $(ARCH)
1214 endif
1215 else
1216 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1217 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1218 endif
1219
1220 ALLSOURCE_ARCHS := $(ARCH)
1221
1222 define find-sources
1223         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1224                \( -name include -o -name arch \) -prune -o \
1225                -name $1 -print; \
1226           for ARCH in $(ALLSOURCE_ARCHS) ; do \
1227                find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1228                     -name $1 -print; \
1229           done ; \
1230           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1231                -name $1 -print; \
1232           find $(__srctree)include $(RCS_FIND_IGNORE) \
1233                \( -name config -o -name 'asm-*' \) -prune \
1234                -o -name $1 -print; \
1235           for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1236                find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1237                     -name $1 -print; \
1238           done ; \
1239           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1240                -name $1 -print )
1241 endef
1242
1243 define all-sources
1244         $(call find-sources,'*.[chS]')
1245 endef
1246 define all-kconfigs
1247         $(call find-sources,'Kconfig*')
1248 endef
1249 define all-defconfigs
1250         $(call find-sources,'defconfig')
1251 endef
1252
1253 quiet_cmd_cscope-file = FILELST cscope.files
1254       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1255
1256 quiet_cmd_cscope = MAKE    cscope.out
1257       cmd_cscope = cscope -b
1258
1259 cscope: FORCE
1260         $(call cmd,cscope-file)
1261         $(call cmd,cscope)
1262
1263 quiet_cmd_TAGS = MAKE   $@
1264 define cmd_TAGS
1265         rm -f $@; \
1266         ETAGSF=`etags --version | grep -i exuberant >/dev/null &&     \
1267                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1268                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1269                       --extra=+f --c-kinds=+px"`;                     \
1270                 $(all-sources) | xargs etags $$ETAGSF -a;             \
1271         if test "x$$ETAGSF" = x; then                                 \
1272                 $(all-kconfigs) | xargs etags -a                      \
1273                 --regex='/^config[ \t]+\([a-zA-Z0-9_]+\)/\1/';        \
1274                 $(all-defconfigs) | xargs etags -a                    \
1275                 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/';     \
1276         fi
1277 endef
1278
1279 TAGS: FORCE
1280         $(call cmd,TAGS)
1281
1282
1283 quiet_cmd_tags = MAKE   $@
1284 define cmd_tags
1285         rm -f $@; \
1286         CTAGSF=`ctags --version | grep -i exuberant >/dev/null &&     \
1287                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1288                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1289                       --extra=+f --c-kinds=+px"`;                     \
1290                 $(all-sources) | xargs ctags $$CTAGSF -a
1291 endef
1292
1293 tags: FORCE
1294         $(call cmd,tags)
1295
1296
1297 # Scripts to check various things for consistency
1298 # ---------------------------------------------------------------------------
1299
1300 includecheck:
1301         find * $(RCS_FIND_IGNORE) \
1302                 -name '*.[hcS]' -type f -print | sort \
1303                 | xargs $(PERL) -w scripts/checkincludes.pl
1304
1305 versioncheck:
1306         find * $(RCS_FIND_IGNORE) \
1307                 -name '*.[hcS]' -type f -print | sort \
1308                 | xargs $(PERL) -w scripts/checkversion.pl
1309
1310 namespacecheck:
1311         $(PERL) $(srctree)/scripts/namespace.pl
1312
1313 endif #ifeq ($(config-targets),1)
1314 endif #ifeq ($(mixed-targets),1)
1315
1316 PHONY += checkstack kernelrelease kernelversion
1317 checkstack:
1318         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1319         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1320
1321 kernelrelease:
1322         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1323         $(error kernelrelease not valid - run 'make prepare' to update it))
1324 kernelversion:
1325         @echo $(KERNELVERSION)
1326
1327 # Single targets
1328 # ---------------------------------------------------------------------------
1329 # Single targets are compatible with:
1330 # - build whith mixed source and output
1331 # - build with separate output dir 'make O=...'
1332 # - external modules
1333 #
1334 #  target-dir => where to store outputfile
1335 #  build-dir  => directory in kernel source tree to use
1336
1337 ifeq ($(KBUILD_EXTMOD),)
1338         build-dir  = $(patsubst %/,%,$(dir $@))
1339         target-dir = $(dir $@)
1340 else
1341         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1342         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1343         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1344 endif
1345
1346 %.s: %.c prepare scripts FORCE
1347         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1348 %.i: %.c prepare scripts FORCE
1349         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1350 %.o: %.c prepare scripts FORCE
1351         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1352 %.lst: %.c prepare scripts FORCE
1353         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1354 %.s: %.S prepare scripts FORCE
1355         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1356 %.o: %.S prepare scripts FORCE
1357         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1358 %.symtypes: %.c prepare scripts FORCE
1359         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1360
1361 # Modules
1362 / %/: prepare scripts FORCE
1363         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1364         $(build)=$(build-dir)
1365 %.ko: prepare scripts FORCE
1366         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1367         $(build)=$(build-dir) $(@:.ko=.o)
1368         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1369
1370 # FIXME Should go into a make.lib or something
1371 # ===========================================================================
1372
1373 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1374       cmd_rmdirs = rm -rf $(rm-dirs)
1375
1376 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1377       cmd_rmfiles = rm -f $(rm-files)
1378
1379
1380 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1381           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1382           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1383
1384 quiet_cmd_as_o_S = AS      $@
1385 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1386
1387 # read all saved command lines
1388
1389 targets := $(wildcard $(sort $(targets)))
1390 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1391
1392 ifneq ($(cmd_files),)
1393   $(cmd_files): ;       # Do not try to update included dependency files
1394   include $(cmd_files)
1395 endif
1396
1397 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1398 # Usage:
1399 # $(Q)$(MAKE) $(clean)=dir
1400 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1401
1402 endif   # skip-makefile
1403
1404 PHONY += FORCE
1405 FORCE:
1406
1407
1408 # Declare the contents of the .PHONY variable as phony.  We keep that
1409 # information in a variable se we can use it in if_changed and friends.
1410 .PHONY: $(PHONY)