Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 15
   4 EXTRAVERSION =-rc3
   5 NAME=Affluent Albatross
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # Do not print "Entering directory ..."
  14 MAKEFLAGS += --no-print-directory
  15
  16 # We are using a recursive build, so we need to do a little thinking
  17 # to get the ordering right.
  18 #
  19 # Most importantly: sub-Makefiles should only ever modify files in
  20 # their own directory. If in some directory we have a dependency on
  21 # a file in another dir (which doesn't happen often, but it's often
  22 # unavoidable when linking the built-in.o targets which finally
  23 # turn into vmlinux), we will call a sub make in that other dir, and
  24 # after that we are sure that everything which is in that other dir
  25 # is now up to date.
  26 #
  27 # The only cases where we need to modify files which have global
  28 # effects are thus separated out and done before the recursive
  29 # descending is started. They are now explicitly listed as the
  30 # prepare rule.
  31
  32 # To put more focus on warnings, be less verbose as default
  33 # Use 'make V=1' to see the full commands
  34
  35 ifdef V
  36   ifeq ("$(origin V)", "command line")
  37     KBUILD_VERBOSE = $(V)
  38   endif
  39 endif
  40 ifndef KBUILD_VERBOSE
  41   KBUILD_VERBOSE = 0
  42 endif
  43
  44 # Call sparse as part of compilation of C files
  45 # Use 'make C=1' to enable sparse checking
  46
  47 ifdef C
  48   ifeq ("$(origin C)", "command line")
  49     KBUILD_CHECKSRC = $(C)
  50   endif
  51 endif
  52 ifndef KBUILD_CHECKSRC
  53   KBUILD_CHECKSRC = 0
  54 endif
  55
  56 # Use make M=dir to specify directory of external module to build
  57 # Old syntax make ... SUBDIRS=$PWD is still supported
  58 # Setting the environment variable KBUILD_EXTMOD take precedence
  59 ifdef SUBDIRS
  60   KBUILD_EXTMOD ?= $(SUBDIRS)
  61 endif
  62 ifdef M
  63   ifeq ("$(origin M)", "command line")
  64     KBUILD_EXTMOD := $(M)
  65   endif
  66 endif
  67
  68
  69 # kbuild supports saving output files in a separate directory.
  70 # To locate output files in a separate directory two syntaxes are supported.
  71 # In both cases the working directory must be the root of the kernel src.
  72 # 1) O=
  73 # Use "make O=dir/to/store/output/files/"
  74 #
  75 # 2) Set KBUILD_OUTPUT
  76 # Set the environment variable KBUILD_OUTPUT to point to the directory
  77 # where the output files shall be placed.
  78 # export KBUILD_OUTPUT=dir/to/store/output/files/
  79 # make
  80 #
  81 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  82 # variable.
  83
  84
  85 # KBUILD_SRC is set on invocation of make in OBJ directory
  86 # KBUILD_SRC is not intended to be used by the regular user (for now)
  87 ifeq ($(KBUILD_SRC),)
  88
  89 # OK, Make called in directory where kernel src resides
  90 # Do we want to locate output files in a separate directory?
  91 ifdef O
  92   ifeq ("$(origin O)", "command line")
  93     KBUILD_OUTPUT := $(O)
  94   endif
  95 endif
  96
  97 # That's our default target when none is given on the command line
  98 .PHONY: _all
  99 _all:
 100
 101 ifneq ($(KBUILD_OUTPUT),)
 102 # Invoke a second make in the output directory, passing relevant variables
 103 # check that the output directory actually exists
 104 saved-output := $(KBUILD_OUTPUT)
 105 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 106 $(if $(KBUILD_OUTPUT),, \
 107      $(error output directory "$(saved-output)" does not exist))
 108
 109 .PHONY: $(MAKECMDGOALS)
 110
 111 $(filter-out _all,$(MAKECMDGOALS)) _all:
 112         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 113         KBUILD_SRC=$(CURDIR) \
 114         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
 115
 116 # Leave processing to above invocation of make
 117 skip-makefile := 1
 118 endif # ifneq ($(KBUILD_OUTPUT),)
 119 endif # ifeq ($(KBUILD_SRC),)
 120
 121 # We process the rest of the Makefile if this is the final invocation of make
 122 ifeq ($(skip-makefile),)
 123
 124 # If building an external module we do not care about the all: rule
 125 # but instead _all depend on modules
 126 .PHONY: all
 127 ifeq ($(KBUILD_EXTMOD),)
 128 _all: all
 129 else
 130 _all: modules
 131 endif
 132
 133 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 134 TOPDIR          := $(srctree)
 135 # FIXME - TOPDIR is obsolete, use srctree/objtree
 136 objtree         := $(CURDIR)
 137 src             := $(srctree)
 138 obj             := $(objtree)
 139
 140 VPATH           := $(srctree)
 141
 142 export srctree objtree VPATH TOPDIR
 143
 144 nullstring :=
 145 space      := $(nullstring) # end of line
 146
 147 # Take the contents of any files called localversion* and the config
 148 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. Be
 149 # careful not to include files twice if building in the source
 150 # directory. LOCALVERSION from the command line override all of this
 151
 152 localver := $(objtree)/localversion* $(srctree)/localversion*
 153 localver := $(sort $(wildcard $(localver)))
 154 # skip backup files (containing '~')
 155 localver := $(foreach f, $(localver), $(if $(findstring ~, $(f)),,$(f)))
 156
 157 LOCALVERSION = $(subst $(space),, \
 158                $(shell cat /dev/null $(localver)) \
 159                $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 160
 161 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)
 162
 163 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 164 # first, and if a usermode build is happening, the "ARCH=um" on the command
 165 # line overrides the setting of ARCH below.  If a native build is happening,
 166 # then ARCH is assigned, getting whatever value it gets normally, and
 167 # SUBARCH is subsequently ignored.
 168
 169 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 170                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 171                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 172                                   -e s/ppc64/powerpc/ )
 173
 174 # Cross compiling and selecting different set of gcc/bin-utils
 175 # ---------------------------------------------------------------------------
 176 #
 177 # When performing cross compilation for other architectures ARCH shall be set
 178 # to the target architecture. (See arch/* for the possibilities).
 179 # ARCH can be set during invocation of make:
 180 # make ARCH=ia64
 181 # Another way is to have ARCH set in the environment.
 182 # The default ARCH is the host where make is executed.
 183
 184 # CROSS_COMPILE specify the prefix used for all executables used
 185 # during compilation. Only gcc and related bin-utils executables
 186 # are prefixed with $(CROSS_COMPILE).
 187 # CROSS_COMPILE can be set on the command line
 188 # make CROSS_COMPILE=ia64-linux-
 189 # Alternatively CROSS_COMPILE can be set in the environment.
 190 # Default value for CROSS_COMPILE is not to prefix executables
 191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192
 193 ARCH            ?= $(SUBARCH)
 194 CROSS_COMPILE   ?=
 195
 196 # Architecture as present in compile.h
 197 UTS_MACHINE := $(ARCH)
 198
 199 # SHELL used by kbuild
 200 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 201           else if [ -x /bin/bash ]; then echo /bin/bash; \
 202           else echo sh; fi ; fi)
 203
 204 HOSTCC          = gcc
 205 HOSTCXX         = g++
 206 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 207 HOSTCXXFLAGS    = -O2
 208
 209 #       Decide whether to build built-in, modular, or both.
 210 #       Normally, just do built-in.
 211
 212 KBUILD_MODULES :=
 213 KBUILD_BUILTIN := 1
 214
 215 #       If we have only "make modules", don't compile built-in objects.
 216 #       When we're building modules with modversions, we need to consider
 217 #       the built-in objects during the descend as well, in order to
 218 #       make sure the checksums are uptodate before we record them.
 219
 220 ifeq ($(MAKECMDGOALS),modules)
 221   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 222 endif
 223
 224 #       If we have "make <whatever> modules", compile modules
 225 #       in addition to whatever we do anyway.
 226 #       Just "make" or "make all" shall build modules as well
 227
 228 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 229   KBUILD_MODULES := 1
 230 endif
 231
 232 ifeq ($(MAKECMDGOALS),)
 233   KBUILD_MODULES := 1
 234 endif
 235
 236 export KBUILD_MODULES KBUILD_BUILTIN
 237 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 238
 239 # Beautify output
 240 # ---------------------------------------------------------------------------
 241 #
 242 # Normally, we echo the whole command before executing it. By making
 243 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 244 # $(quiet) to choose other forms of output instead, e.g.
 245 #
 246 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 247 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 248 #
 249 # If $(quiet) is empty, the whole command will be printed.
 250 # If it is set to "quiet_", only the short version will be printed.
 251 # If it is set to "silent_", nothing wil be printed at all, since
 252 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 253 #
 254 # A simple variant is to prefix commands with $(Q) - that's usefull
 255 # for commands that shall be hidden in non-verbose mode.
 256 #
 257 #       $(Q)ln $@ :<
 258 #
 259 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 260 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 261
 262 ifeq ($(KBUILD_VERBOSE),1)
 263   quiet =
 264   Q =
 265 else
 266   quiet=quiet_
 267   Q = @
 268 endif
 269
 270 # If the user is running make -s (silent mode), suppress echoing of
 271 # commands
 272
 273 ifneq ($(findstring s,$(MAKEFLAGS)),)
 274   quiet=silent_
 275 endif
 276
 277 export quiet Q KBUILD_VERBOSE
 278
 279 ######
 280 # cc support functions to be used (only) in arch/$(ARCH)/Makefile
 281 # See documentation in Documentation/kbuild/makefiles.txt
 282
 283 # cc-option
 284 # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
 285
 286 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 287              > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 288
 289 # For backward compatibility
 290 check_gcc = $(warning check_gcc is deprecated - use cc-option) \
 291             $(call cc-option, $(1),$(2))
 292
 293 # cc-option-yn
 294 # Usage: flag := $(call cc-option-yn, -march=winchip-c6)
 295 cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 296                 > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
 297
 298 # cc-option-align
 299 # Prefix align with either -falign or -malign
 300 cc-option-align = $(subst -functions=0,,\
 301         $(call cc-option,-falign-functions=0,-malign-functions=0))
 302
 303 # cc-version
 304 # Usage gcc-ver := $(call cc-version $(CC))
 305 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
 306               $(if $(1), $(1), $(CC)))
 307
 308
 309 # Look for make include files relative to root of kernel src
 310 MAKEFLAGS += --include-dir=$(srctree)
 311
 312 # We need some generic definitions
 313 include  $(srctree)/scripts/Kbuild.include
 314
 315 # For maximum performance (+ possibly random breakage, uncomment
 316 # the following)
 317
 318 #MAKEFLAGS += -rR
 319
 320 # Make variables (CC, etc...)
 321
 322 AS              = $(CROSS_COMPILE)as
 323 LD              = $(CROSS_COMPILE)ld
 324 CC              = $(CROSS_COMPILE)gcc
 325 CPP             = $(CC) -E
 326 AR              = $(CROSS_COMPILE)ar
 327 NM              = $(CROSS_COMPILE)nm
 328 STRIP           = $(CROSS_COMPILE)strip
 329 OBJCOPY         = $(CROSS_COMPILE)objcopy
 330 OBJDUMP         = $(CROSS_COMPILE)objdump
 331 AWK             = awk
 332 GENKSYMS        = scripts/genksyms/genksyms
 333 DEPMOD          = /sbin/depmod
 334 KALLSYMS        = scripts/kallsyms
 335 PERL            = perl
 336 CHECK           = sparse
 337
 338 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 339 MODFLAGS        = -DMODULE
 340 CFLAGS_MODULE   = $(MODFLAGS)
 341 AFLAGS_MODULE   = $(MODFLAGS)
 342 LDFLAGS_MODULE  = -r
 343 CFLAGS_KERNEL   =
 344 AFLAGS_KERNEL   =
 345
 346
 347 # Use LINUXINCLUDE when you must reference the include/ directory.
 348 # Needed to be compatible with the O= option
 349 LINUXINCLUDE    := -Iinclude \
 350                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 351                    -include include/linux/autoconf.h
 352
 353 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 354
 355 CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 356                    -fno-strict-aliasing -fno-common \
 357                    -ffreestanding
 358 AFLAGS          := -D__ASSEMBLY__
 359
 360 export  VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \
 361         ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 362         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 363         HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 364
 365 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 366 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 367 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 368
 369 # When compiling out-of-tree modules, put MODVERDIR in the module
 370 # tree rather than in the kernel tree. The kernel tree might
 371 # even be read-only.
 372 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 373
 374 # Files to ignore in find ... statements
 375
 376 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
 377 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 378
 379 # ===========================================================================
 380 # Rules shared between *config targets and build targets
 381
 382 # Basic helpers built in scripts/
 383 .PHONY: scripts_basic
 384 scripts_basic:
 385         $(Q)$(MAKE) $(build)=scripts/basic
 386
 387 # To avoid any implicit rule to kick in, define an empty command.
 388 scripts/basic/%: scripts_basic ;
 389
 390 .PHONY: outputmakefile
 391 # outputmakefile generate a Makefile to be placed in output directory, if
 392 # using a seperate output directory. This allows convinient use
 393 # of make in output directory
 394 outputmakefile:
 395         $(Q)if test ! $(srctree) -ef $(objtree); then \
 396         $(CONFIG_SHELL) $(srctree)/scripts/mkmakefile              \
 397             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)         \
 398             > $(objtree)/Makefile;                                 \
 399             echo '  GEN    $(objtree)/Makefile';                   \
 400         fi
 401
 402 # To make sure we do not include .config for any of the *config targets
 403 # catch them early, and hand them over to scripts/kconfig/Makefile
 404 # It is allowed to specify more targets when calling make, including
 405 # mixing *config targets and build targets.
 406 # For example 'make oldconfig all'.
 407 # Detect when mixed targets is specified, and make a second invocation
 408 # of make so .config is not included in this case either (for *config).
 409
 410 no-dot-config-targets := clean mrproper distclean \
 411                          cscope TAGS tags help %docs check% kernelrelease
 412
 413 config-targets := 0
 414 mixed-targets  := 0
 415 dot-config     := 1
 416
 417 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 418         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 419                 dot-config := 0
 420         endif
 421 endif
 422
 423 ifeq ($(KBUILD_EXTMOD),)
 424         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 425                 config-targets := 1
 426                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 427                         mixed-targets := 1
 428                 endif
 429         endif
 430 endif
 431
 432 ifeq ($(mixed-targets),1)
 433 # ===========================================================================
 434 # We're called with mixed targets (*config and build targets).
 435 # Handle them one by one.
 436
 437 %:: FORCE
 438         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 439
 440 else
 441 ifeq ($(config-targets),1)
 442 # ===========================================================================
 443 # *config targets only - make sure prerequisites are updated, and descend
 444 # in scripts/kconfig to make the *config target
 445
 446 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 447 # KBUILD_DEFCONFIG may point out an alternative default configuration
 448 # used for 'make defconfig'
 449 include $(srctree)/arch/$(ARCH)/Makefile
 450 export KBUILD_DEFCONFIG
 451
 452 config %config: scripts_basic outputmakefile FORCE
 453         $(Q)mkdir -p include/linux
 454         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 455
 456 else
 457 # ===========================================================================
 458 # Build targets only - this includes vmlinux, arch specific targets, clean
 459 # targets and others. In general all targets except *config targets.
 460
 461 ifeq ($(KBUILD_EXTMOD),)
 462 # Additional helpers built in scripts/
 463 # Carefully list dependencies so we do not try to build scripts twice
 464 # in parrallel
 465 .PHONY: scripts
 466 scripts: scripts_basic include/config/MARKER
 467         $(Q)$(MAKE) $(build)=$(@)
 468
 469 scripts_basic: include/linux/autoconf.h
 470
 471 # Objects we will link into vmlinux / subdirs we need to visit
 472 init-y          := init/
 473 drivers-y       := drivers/ sound/
 474 net-y           := net/
 475 libs-y          := lib/
 476 core-y          := usr/
 477 endif # KBUILD_EXTMOD
 478
 479 ifeq ($(dot-config),1)
 480 # In this section, we need .config
 481
 482 # Read in dependencies to all Kconfig* files, make sure to run
 483 # oldconfig if changes are detected.
 484 -include .config.cmd
 485
 486 include .config
 487
 488 # If .config needs to be updated, it will be done via the dependency
 489 # that autoconf has on .config.
 490 # To avoid any implicit rule to kick in, define an empty command
 491 .config: ;
 492
 493 # If .config is newer than include/linux/autoconf.h, someone tinkered
 494 # with it and forgot to run make oldconfig
 495 include/linux/autoconf.h: .config
 496         $(Q)mkdir -p include/linux
 497         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 498 else
 499 # Dummy target needed, because used as prerequisite
 500 include/linux/autoconf.h: ;
 501 endif
 502
 503 # The all: target is the default when no target is given on the
 504 # command line.
 505 # This allow a user to issue only 'make' to build a kernel including modules
 506 # Defaults vmlinux but it is usually overriden in the arch makefile
 507 all: vmlinux
 508
 509 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 510 CFLAGS          += -Os
 511 else
 512 CFLAGS          += -O2
 513 endif
 514
 515 #Add align options if CONFIG_CC_* is not equal to 0
 516 add-align = $(if $(filter-out 0,$($(1))),$(cc-option-align)$(2)=$($(1)))
 517 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_FUNCTIONS,-functions)
 518 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LABELS,-labels)
 519 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
 520 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
 521
 522 ifdef CONFIG_FRAME_POINTER
 523 CFLAGS          += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 524 else
 525 CFLAGS          += -fomit-frame-pointer
 526 endif
 527
 528 ifdef CONFIG_DEBUG_INFO
 529 CFLAGS          += -g
 530 endif
 531
 532 include $(srctree)/arch/$(ARCH)/Makefile
 533
 534 # arch Makefile may override CC so keep this after arch Makefile is included
 535 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 536 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 537
 538 # warn about C99 declaration after statement
 539 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 540
 541 # disable pointer signedness warnings in gcc 4.0
 542 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 543
 544 # Default kernel image to build when no specific target is given.
 545 # KBUILD_IMAGE may be overruled on the commandline or
 546 # set in the environment
 547 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 548 # this default value
 549 export KBUILD_IMAGE ?= vmlinux
 550
 551 #
 552 # INSTALL_PATH specifies where to place the updated kernel and system map
 553 # images. Default is /boot, but you can set it to other values
 554 export  INSTALL_PATH ?= /boot
 555
 556 # If CONFIG_LOCALVERSION_AUTO is set, we automatically perform some tests
 557 # and try to determine if the current source tree is a release tree, of any sort,
 558 # or if is a pure development tree.
 559 #
 560 # A 'release tree' is any tree with a git TAG associated
 561 # with it.  The primary goal of this is to make it safe for a native
 562 # git/CVS/SVN user to build a release tree (i.e, 2.6.9) and also to
 563 # continue developing against the current Linus tree, without having the Linus
 564 # tree overwrite the 2.6.9 tree when installed.
 565 #
 566 # Currently, only git is supported.
 567 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 568 # checks as needed.
 569
 570
 571 ifdef CONFIG_LOCALVERSION_AUTO
 572         localversion-auto := $(shell $(PERL) $(srctree)/scripts/setlocalversion $(srctree))
 573         LOCALVERSION := $(LOCALVERSION)$(localversion-auto)
 574 endif
 575
 576 #
 577 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 578 # relocations required by build roots.  This is not defined in the
 579 # makefile but the arguement can be passed to make if needed.
 580 #
 581
 582 MODLIB  := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 583 export MODLIB
 584
 585
 586 ifeq ($(KBUILD_EXTMOD),)
 587 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 588
 589 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 590                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 591                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 592
 593 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 594                      $(init-n) $(init-) \
 595                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 596                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 597
 598 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 599 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 600 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 601 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 602 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 603 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 604 libs-y          := $(libs-y1) $(libs-y2)
 605
 606 # Build vmlinux
 607 # ---------------------------------------------------------------------------
 608 # vmlinux is build from the objects selected by $(vmlinux-init) and
 609 # $(vmlinux-main). Most are built-in.o files from top-level directories
 610 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 611 # Ordering when linking is important, and $(vmlinux-init) must be first.
 612 #
 613 # vmlinux
 614 #   ^
 615 #   |
 616 #   +-< $(vmlinux-init)
 617 #   |   +--< init/version.o + more
 618 #   |
 619 #   +--< $(vmlinux-main)
 620 #   |    +--< driver/built-in.o mm/built-in.o + more
 621 #   |
 622 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 623 #
 624 # vmlinux version (uname -v) cannot be updated during normal
 625 # descending-into-subdirs phase since we do not yet know if we need to
 626 # update vmlinux.
 627 # Therefore this step is delayed until just before final link of vmlinux -
 628 # except in the kallsyms case where it is done just before adding the
 629 # symbols to the kernel.
 630 #
 631 # System.map is generated to document addresses of all kernel symbols
 632
 633 vmlinux-init := $(head-y) $(init-y)
 634 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 635 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 636 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 637
 638 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 639 # May be overridden by arch/$(ARCH)/Makefile
 640 quiet_cmd_vmlinux__ ?= LD      $@
 641       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 642       -T $(vmlinux-lds) $(vmlinux-init)                          \
 643       --start-group $(vmlinux-main) --end-group                  \
 644       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 645
 646 # Generate new vmlinux version
 647 quiet_cmd_vmlinux_version = GEN     .version
 648       cmd_vmlinux_version = set -e;                     \
 649         if [ ! -r .version ]; then                      \
 650           rm -f .version;                               \
 651           echo 1 >.version;                             \
 652         else                                            \
 653           mv .version .old_version;                     \
 654           expr 0$$(cat .old_version) + 1 >.version;     \
 655         fi;                                             \
 656         $(MAKE) $(build)=init
 657
 658 # Generate System.map
 659 quiet_cmd_sysmap = SYSMAP
 660       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 661
 662 # Link of vmlinux
 663 # If CONFIG_KALLSYMS is set .version is already updated
 664 # Generate System.map and verify that the content is consistent
 665 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 666 # First command is ':' to allow us to use + in front of the rule
 667 define rule_vmlinux__
 668         :
 669         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 670
 671         $(call cmd,vmlinux__)
 672         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 673
 674         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 675           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 676         $(cmd_sysmap) $@ System.map;                    \
 677         if [ $$? -ne 0 ]; then                          \
 678                 rm -f $@;                               \
 679                 /bin/false;                             \
 680         fi;
 681         $(verify_kallsyms)
 682 endef
 683
 684
 685 ifdef CONFIG_KALLSYMS
 686 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 687 # It's a three stage process:
 688 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 689 #   empty
 690 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 691 #   the right size - vmlinux version (uname -v) is updated during this step
 692 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 693 #   but due to the added section, some addresses have shifted.
 694 #   From here, we generate a correct .tmp_kallsyms2.o
 695 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 696 # o Verify that the System.map from vmlinux matches the map from
 697 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 698 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 699 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 700 #   temporary bypass to allow the kernel to be built while the
 701 #   maintainers work out what went wrong with kallsyms.
 702
 703 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 704 last_kallsyms := 3
 705 else
 706 last_kallsyms := 2
 707 endif
 708
 709 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 710
 711 define verify_kallsyms
 712         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 713           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 714           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 715         $(Q)cmp -s System.map .tmp_System.map ||              \
 716                 (echo Inconsistent kallsyms data;             \
 717                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 718                  rm .tmp_kallsyms* ; /bin/false )
 719 endef
 720
 721 # Update vmlinux version before link
 722 # Use + in front of this rule to silent warning about make -j1
 723 # First command is ':' to allow us to use + in front of this rule
 724 cmd_ksym_ld = $(cmd_vmlinux__)
 725 define rule_ksym_ld
 726         :
 727         +$(call cmd,vmlinux_version)
 728         $(call cmd,vmlinux__)
 729         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 730 endef
 731
 732 # Generate .S file with all kernel symbols
 733 quiet_cmd_kallsyms = KSYM    $@
 734       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 735                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 736
 737 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 738         $(call if_changed_dep,as_o_S)
 739
 740 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 741         $(call cmd,kallsyms)
 742
 743 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 744 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 745         $(call if_changed_rule,ksym_ld)
 746
 747 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 748         $(call if_changed,vmlinux__)
 749
 750 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 751         $(call if_changed,vmlinux__)
 752
 753 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 754 $(KALLSYMS): scripts ;
 755
 756 # Generate some data for debugging strange kallsyms problems
 757 debug_kallsyms: .tmp_map$(last_kallsyms)
 758
 759 .tmp_map%: .tmp_vmlinux% FORCE
 760         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 761
 762 .tmp_map3: .tmp_map2
 763
 764 .tmp_map2: .tmp_map1
 765
 766 endif # ifdef CONFIG_KALLSYMS
 767
 768 # vmlinux image - including updated kernel symbols
 769 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 770         $(call if_changed_rule,vmlinux__)
 771         $(Q)rm -f .old_version
 772
 773 # The actual objects are generated when descending,
 774 # make sure no implicit rule kicks in
 775 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 776
 777 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 778 # Preset locale variables to speed up the build process. Limit locale
 779 # tweaks to this spot to avoid wrong language settings when running
 780 # make menuconfig etc.
 781 # Error messages still appears in the original language
 782
 783 .PHONY: $(vmlinux-dirs)
 784 $(vmlinux-dirs): prepare scripts
 785         $(Q)$(MAKE) $(build)=$@
 786
 787 # Things we need to do before we recursively start building the kernel
 788 # or the modules are listed in "prepare".
 789 # A multi level approach is used. prepareN is processed before prepareN-1.
 790 # archprepare is used in arch Makefiles and when processed asm symlink,
 791 # version.h and scripts_basic is processed / created.
 792
 793 # Listed in dependency order
 794 .PHONY: prepare archprepare prepare0 prepare1 prepare2 prepare3
 795
 796 # prepare-all is deprecated, use prepare as valid replacement
 797 .PHONY: prepare-all
 798
 799 # prepare3 is used to check if we are building in a separate output directory,
 800 # and if so do:
 801 # 1) Check that make has not been executed in the kernel src $(srctree)
 802 # 2) Create the include2 directory, used for the second asm symlink
 803
 804 prepare3:
 805 ifneq ($(KBUILD_SRC),)
 806         @echo '  Using $(srctree) as source for kernel'
 807         $(Q)if [ -f $(srctree)/.config ]; then \
 808                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 809                 echo "  in the '$(srctree)' directory.";\
 810                 /bin/false; \
 811         fi;
 812         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 813         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 814 endif
 815
 816 # prepare2 creates a makefile if using a separate output directory
 817 prepare2: prepare3 outputmakefile
 818
 819 prepare1: prepare2 include/linux/version.h include/asm \
 820                    include/config/MARKER
 821 ifneq ($(KBUILD_MODULES),)
 822         $(Q)rm -rf $(MODVERDIR)
 823         $(Q)mkdir -p $(MODVERDIR)
 824 endif
 825
 826 archprepare: prepare1 scripts_basic
 827
 828 prepare0: archprepare FORCE
 829         $(Q)$(MAKE) $(build)=.
 830
 831 # All the preparing..
 832 prepare prepare-all: prepare0
 833
 834 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 835 #       done in arch/$(ARCH)/kernel/Makefile
 836
 837 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 838
 839 # Single targets
 840 # ---------------------------------------------------------------------------
 841
 842 %.s: %.c scripts FORCE
 843         $(Q)$(MAKE) $(build)=$(@D) $@
 844 %.i: %.c scripts FORCE
 845         $(Q)$(MAKE) $(build)=$(@D) $@
 846 %.o: %.c scripts FORCE
 847         $(Q)$(MAKE) $(build)=$(@D) $@
 848 %.ko: scripts FORCE
 849         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D) $(@:.ko=.o)
 850         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 851 %/:      scripts prepare FORCE
 852         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
 853 %.lst: %.c scripts FORCE
 854         $(Q)$(MAKE) $(build)=$(@D) $@
 855 %.s: %.S scripts FORCE
 856         $(Q)$(MAKE) $(build)=$(@D) $@
 857 %.o: %.S scripts FORCE
 858         $(Q)$(MAKE) $(build)=$(@D) $@
 859
 860 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 861 #       hard to detect, but I suppose "make mrproper" is a good idea
 862 #       before switching between archs anyway.
 863
 864 include/asm:
 865         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 866         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 867         @ln -fsn asm-$(ARCH) $@
 868
 869 #       Split autoconf.h into include/linux/config/*
 870
 871 include/config/MARKER: scripts/basic/split-include include/linux/autoconf.h
 872         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 873         @scripts/basic/split-include include/linux/autoconf.h include/config
 874         @touch $@
 875
 876 # Generate some files
 877 # ---------------------------------------------------------------------------
 878
 879 # KERNELRELEASE can change from a few different places, meaning version.h
 880 # needs to be updated, so this check is forced on all builds
 881
 882 uts_len := 64
 883
 884 define filechk_version.h
 885         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 886           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 887           exit 1; \
 888         fi; \
 889         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 890           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 891          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 892         )
 893 endef
 894
 895 include/linux/version.h: $(srctree)/Makefile FORCE
 896         $(call filechk,version.h)
 897
 898 # ---------------------------------------------------------------------------
 899
 900 .PHONY: depend dep
 901 depend dep:
 902         @echo '*** Warning: make $@ is unnecessary now.'
 903
 904 # ---------------------------------------------------------------------------
 905 # Modules
 906
 907 ifdef CONFIG_MODULES
 908
 909 #       By default, build modules as well
 910
 911 all: modules
 912
 913 #       Build modules
 914
 915 .PHONY: modules
 916 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 917         @echo '  Building modules, stage 2.';
 918         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 919
 920
 921 # Target to prepare building external modules
 922 .PHONY: modules_prepare
 923 modules_prepare: prepare scripts
 924
 925 # Target to install modules
 926 .PHONY: modules_install
 927 modules_install: _modinst_ _modinst_post
 928
 929 .PHONY: _modinst_
 930 _modinst_:
 931         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 932                 echo "Warning: you may need to install module-init-tools"; \
 933                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 934                 sleep 1; \
 935         fi
 936         @rm -rf $(MODLIB)/kernel
 937         @rm -f $(MODLIB)/source
 938         @mkdir -p $(MODLIB)/kernel
 939         @ln -s $(srctree) $(MODLIB)/source
 940         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 941                 rm -f $(MODLIB)/build ; \
 942                 ln -s $(objtree) $(MODLIB)/build ; \
 943         fi
 944         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 945
 946 # If System.map exists, run depmod.  This deliberately does not have a
 947 # dependency on System.map since that would run the dependency tree on
 948 # vmlinux.  This depmod is only for convenience to give the initial
 949 # boot a modules.dep even before / is mounted read-write.  However the
 950 # boot script depmod is the master version.
 951 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 952 depmod_opts     :=
 953 else
 954 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 955 endif
 956 .PHONY: _modinst_post
 957 _modinst_post: _modinst_
 958         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 959
 960 else # CONFIG_MODULES
 961
 962 # Modules not configured
 963 # ---------------------------------------------------------------------------
 964
 965 modules modules_install: FORCE
 966         @echo
 967         @echo "The present kernel configuration has modules disabled."
 968         @echo "Type 'make config' and enable loadable module support."
 969         @echo "Then build a kernel with module support enabled."
 970         @echo
 971         @exit 1
 972
 973 endif # CONFIG_MODULES
 974
 975 ###
 976 # Cleaning is done on three levels.
 977 # make clean     Delete most generated files
 978 #                Leave enough to build external modules
 979 # make mrproper  Delete the current configuration, and all generated files
 980 # make distclean Remove editor backup files, patch leftover files and the like
 981
 982 # Directories & files removed with 'make clean'
 983 CLEAN_DIRS  += $(MODVERDIR)
 984 CLEAN_FILES +=  vmlinux System.map \
 985                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 986
 987 # Directories & files removed with 'make mrproper'
 988 MRPROPER_DIRS  += include/config include2
 989 MRPROPER_FILES += .config .config.old include/asm .version \
 990                   include/linux/autoconf.h include/linux/version.h \
 991                   Module.symvers tags TAGS cscope*
 992
 993 # clean - Delete most, but leave enough to build external modules
 994 #
 995 clean: rm-dirs  := $(CLEAN_DIRS)
 996 clean: rm-files := $(CLEAN_FILES)
 997 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
 998
 999 .PHONY: $(clean-dirs) clean archclean
1000 $(clean-dirs):
1001         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1002
1003 clean: archclean $(clean-dirs)
1004         $(call cmd,rmdirs)
1005         $(call cmd,rmfiles)
1006         @find . $(RCS_FIND_IGNORE) \
1007                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1008                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1009                 -type f -print | xargs rm -f
1010
1011 # mrproper - Delete all generated files, including .config
1012 #
1013 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1014 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1015 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1016
1017 .PHONY: $(mrproper-dirs) mrproper archmrproper
1018 $(mrproper-dirs):
1019         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1020
1021 mrproper: clean archmrproper $(mrproper-dirs)
1022         $(call cmd,rmdirs)
1023         $(call cmd,rmfiles)
1024
1025 # distclean
1026 #
1027 .PHONY: distclean
1028
1029 distclean: mrproper
1030         @find $(srctree) $(RCS_FIND_IGNORE) \
1031                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1032                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1033                 -o -name '.*.rej' -o -size 0 \
1034                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1035                 -type f -print | xargs rm -f
1036
1037
1038 # Packaging of the kernel to various formats
1039 # ---------------------------------------------------------------------------
1040 # rpm target kept for backward compatibility
1041 package-dir     := $(srctree)/scripts/package
1042
1043 .PHONY: %-pkg rpm
1044
1045 %pkg: FORCE
1046         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1047 rpm: FORCE
1048         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1049
1050
1051 # Brief documentation of the typical targets used
1052 # ---------------------------------------------------------------------------
1053
1054 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1055 boards := $(notdir $(boards))
1056
1057 help:
1058         @echo  'Cleaning targets:'
1059         @echo  '  clean           - remove most generated files but keep the config'
1060         @echo  '  mrproper        - remove all generated files + config + various backup files'
1061         @echo  ''
1062         @echo  'Configuration targets:'
1063         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1064         @echo  ''
1065         @echo  'Other generic targets:'
1066         @echo  '  all             - Build all targets marked with [*]'
1067         @echo  '* vmlinux         - Build the bare kernel'
1068         @echo  '* modules         - Build all modules'
1069         @echo  '  modules_install - Install all modules'
1070         @echo  '  dir/            - Build all files in dir and below'
1071         @echo  '  dir/file.[ois]  - Build specified target only'
1072         @echo  '  dir/file.ko     - Build module including final link'
1073         @echo  '  rpm             - Build a kernel as an RPM package'
1074         @echo  '  tags/TAGS       - Generate tags file for editors'
1075         @echo  '  cscope          - Generate cscope index'
1076         @echo  '  kernelrelease   - Output the release version string'
1077         @echo  ''
1078         @echo  'Static analysers'
1079         @echo  '  buildcheck      - List dangling references to vmlinux discarded sections'
1080         @echo  '                    and init sections from non-init sections'
1081         @echo  '  checkstack      - Generate a list of stack hogs'
1082         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1083         @echo  ''
1084         @echo  'Kernel packaging:'
1085         @$(MAKE) -f $(package-dir)/Makefile help
1086         @echo  ''
1087         @echo  'Documentation targets:'
1088         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1089         @echo  ''
1090         @echo  'Architecture specific targets ($(ARCH)):'
1091         @$(if $(archhelp),$(archhelp),\
1092                 echo '  No architecture specific help defined for $(ARCH)')
1093         @echo  ''
1094         @$(if $(boards), \
1095                 $(foreach b, $(boards), \
1096                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1097                 echo '')
1098
1099         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1100         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1101         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1102         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1103         @echo  ''
1104         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1105         @echo  'For further info see the ./README file'
1106
1107
1108 # Documentation targets
1109 # ---------------------------------------------------------------------------
1110 %docs: scripts_basic FORCE
1111         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1112
1113 else # KBUILD_EXTMOD
1114
1115 ###
1116 # External module support.
1117 # When building external modules the kernel used as basis is considered
1118 # read-only, and no consistency checks are made and the make
1119 # system is not used on the basis kernel. If updates are required
1120 # in the basis kernel ordinary make commands (without M=...) must
1121 # be used.
1122 #
1123 # The following are the only valid targets when building external
1124 # modules.
1125 # make M=dir clean     Delete all automatically generated files
1126 # make M=dir modules   Make all modules in specified dir
1127 # make M=dir           Same as 'make M=dir modules'
1128 # make M=dir modules_install
1129 #                      Install the modules build in the module directory
1130 #                      Assumes install directory is already created
1131
1132 # We are always building modules
1133 KBUILD_MODULES := 1
1134 .PHONY: crmodverdir
1135 crmodverdir:
1136         $(Q)mkdir -p $(MODVERDIR)
1137
1138 .PHONY: $(objtree)/Module.symvers
1139 $(objtree)/Module.symvers:
1140         @test -e $(objtree)/Module.symvers || ( \
1141         echo; \
1142         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1143         echo "           is missing; modules will have no dependencies and modversions."; \
1144         echo )
1145
1146 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1147 .PHONY: $(module-dirs) modules
1148 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1149         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1150
1151 modules: $(module-dirs)
1152         @echo '  Building modules, stage 2.';
1153         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1154
1155 .PHONY: modules_install
1156 modules_install:
1157         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1158
1159 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1160
1161 .PHONY: $(clean-dirs) clean
1162 $(clean-dirs):
1163         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1164
1165 clean:  rm-dirs := $(MODVERDIR)
1166 clean: $(clean-dirs)
1167         $(call cmd,rmdirs)
1168         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1169                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1170                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1171                 -type f -print | xargs rm -f
1172
1173 help:
1174         @echo  '  Building external modules.'
1175         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1176         @echo  ''
1177         @echo  '  modules         - default target, build the module(s)'
1178         @echo  '  modules_install - install the module'
1179         @echo  '  clean           - remove generated files in module directory only'
1180         @echo  ''
1181 endif # KBUILD_EXTMOD
1182
1183 # Generate tags for editors
1184 # ---------------------------------------------------------------------------
1185
1186 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1187 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1188 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1189
1190 ifeq ($(src),$(obj))
1191 __srctree =
1192 else
1193 __srctree = $(srctree)/
1194 endif
1195
1196 ifeq ($(ALLSOURCE_ARCHS),)
1197 ifeq ($(ARCH),um)
1198 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1199 else
1200 ALLINCLUDE_ARCHS := $(ARCH)
1201 endif
1202 else
1203 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1204 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1205 endif
1206
1207 ALLSOURCE_ARCHS := $(ARCH)
1208
1209 define all-sources
1210         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1211                \( -name include -o -name arch \) -prune -o \
1212                -name '*.[chS]' -print; \
1213           for ARCH in $(ALLSOURCE_ARCHS) ; do \
1214                find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1215                     -name '*.[chS]' -print; \
1216           done ; \
1217           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1218                -name '*.[chS]' -print; \
1219           find $(__srctree)include $(RCS_FIND_IGNORE) \
1220                \( -name config -o -name 'asm-*' \) -prune \
1221                -o -name '*.[chS]' -print; \
1222           for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1223                find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1224                     -name '*.[chS]' -print; \
1225           done ; \
1226           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1227                -name '*.[chS]' -print )
1228 endef
1229
1230 quiet_cmd_cscope-file = FILELST cscope.files
1231       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1232
1233 quiet_cmd_cscope = MAKE    cscope.out
1234       cmd_cscope = cscope -b
1235
1236 cscope: FORCE
1237         $(call cmd,cscope-file)
1238         $(call cmd,cscope)
1239
1240 quiet_cmd_TAGS = MAKE   $@
1241 define cmd_TAGS
1242         rm -f $@; \
1243         ETAGSF=`etags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL --extra=+f"`; \
1244         $(all-sources) | xargs etags $$ETAGSF -a
1245 endef
1246
1247 TAGS: FORCE
1248         $(call cmd,TAGS)
1249
1250
1251 quiet_cmd_tags = MAKE   $@
1252 define cmd_tags
1253         rm -f $@; \
1254         CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL --extra=+f"`; \
1255         $(all-sources) | xargs ctags $$CTAGSF -a
1256 endef
1257
1258 tags: FORCE
1259         $(call cmd,tags)
1260
1261
1262 # Scripts to check various things for consistency
1263 # ---------------------------------------------------------------------------
1264
1265 includecheck:
1266         find * $(RCS_FIND_IGNORE) \
1267                 -name '*.[hcS]' -type f -print | sort \
1268                 | xargs $(PERL) -w scripts/checkincludes.pl
1269
1270 versioncheck:
1271         find * $(RCS_FIND_IGNORE) \
1272                 -name '*.[hcS]' -type f -print | sort \
1273                 | xargs $(PERL) -w scripts/checkversion.pl
1274
1275 buildcheck:
1276         $(PERL) $(srctree)/scripts/reference_discarded.pl
1277         $(PERL) $(srctree)/scripts/reference_init.pl
1278
1279 namespacecheck:
1280         $(PERL) $(srctree)/scripts/namespace.pl
1281
1282 endif #ifeq ($(config-targets),1)
1283 endif #ifeq ($(mixed-targets),1)
1284
1285 .PHONY: checkstack
1286 checkstack:
1287         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1288         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1289
1290 kernelrelease:
1291         @echo $(KERNELRELEASE)
1292
1293 # FIXME Should go into a make.lib or something
1294 # ===========================================================================
1295
1296 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1297       cmd_rmdirs = rm -rf $(rm-dirs)
1298
1299 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1300       cmd_rmfiles = rm -f $(rm-files)
1301
1302
1303 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1304           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1305           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1306
1307 quiet_cmd_as_o_S = AS      $@
1308 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1309
1310 # read all saved command lines
1311
1312 targets := $(wildcard $(sort $(targets)))
1313 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1314
1315 ifneq ($(cmd_files),)
1316   $(cmd_files): ;       # Do not try to update included dependency files
1317   include $(cmd_files)
1318 endif
1319
1320 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1321 # Usage:
1322 # $(Q)$(MAKE) $(clean)=dir
1323 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1324
1325 endif   # skip-makefile
1326
1327 FORCE: