Makefile

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