Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 16
   4 EXTRAVERSION =-rc4
   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                    -ffreestanding
 311 AFLAGS          := -D__ASSEMBLY__
 312
 313 # Read KERNELRELEASE from .kernelrelease (if it exists)
 314 KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
 315 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 316
 317 export  VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
 318         ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 319         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 320         HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 321
 322 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 323 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 324 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 325
 326 # When compiling out-of-tree modules, put MODVERDIR in the module
 327 # tree rather than in the kernel tree. The kernel tree might
 328 # even be read-only.
 329 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 330
 331 # Files to ignore in find ... statements
 332
 333 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
 334 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 335
 336 # ===========================================================================
 337 # Rules shared between *config targets and build targets
 338
 339 # Basic helpers built in scripts/
 340 PHONY += scripts_basic
 341 scripts_basic:
 342         $(Q)$(MAKE) $(build)=scripts/basic
 343
 344 # To avoid any implicit rule to kick in, define an empty command.
 345 scripts/basic/%: scripts_basic ;
 346
 347 PHONY += outputmakefile
 348 # outputmakefile generate a Makefile to be placed in output directory, if
 349 # using a seperate output directory. This allows convinient use
 350 # of make in output directory
 351 outputmakefile:
 352         $(Q)if test ! $(srctree) -ef $(objtree); then \
 353         $(CONFIG_SHELL) $(srctree)/scripts/mkmakefile              \
 354             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)         \
 355             > $(objtree)/Makefile;                                 \
 356             echo '  GEN    $(objtree)/Makefile';                   \
 357         fi
 358
 359 # To make sure we do not include .config for any of the *config targets
 360 # catch them early, and hand them over to scripts/kconfig/Makefile
 361 # It is allowed to specify more targets when calling make, including
 362 # mixing *config targets and build targets.
 363 # For example 'make oldconfig all'.
 364 # Detect when mixed targets is specified, and make a second invocation
 365 # of make so .config is not included in this case either (for *config).
 366
 367 no-dot-config-targets := clean mrproper distclean \
 368                          cscope TAGS tags help %docs check%
 369
 370 config-targets := 0
 371 mixed-targets  := 0
 372 dot-config     := 1
 373
 374 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 375         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 376                 dot-config := 0
 377         endif
 378 endif
 379
 380 ifeq ($(KBUILD_EXTMOD),)
 381         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 382                 config-targets := 1
 383                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 384                         mixed-targets := 1
 385                 endif
 386         endif
 387 endif
 388
 389 ifeq ($(mixed-targets),1)
 390 # ===========================================================================
 391 # We're called with mixed targets (*config and build targets).
 392 # Handle them one by one.
 393
 394 %:: FORCE
 395         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 396
 397 else
 398 ifeq ($(config-targets),1)
 399 # ===========================================================================
 400 # *config targets only - make sure prerequisites are updated, and descend
 401 # in scripts/kconfig to make the *config target
 402
 403 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 404 # KBUILD_DEFCONFIG may point out an alternative default configuration
 405 # used for 'make defconfig'
 406 include $(srctree)/arch/$(ARCH)/Makefile
 407 export KBUILD_DEFCONFIG
 408
 409 config %config: scripts_basic outputmakefile FORCE
 410         $(Q)mkdir -p include/linux
 411         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 412         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
 413
 414 else
 415 # ===========================================================================
 416 # Build targets only - this includes vmlinux, arch specific targets, clean
 417 # targets and others. In general all targets except *config targets.
 418
 419 ifeq ($(KBUILD_EXTMOD),)
 420 # Additional helpers built in scripts/
 421 # Carefully list dependencies so we do not try to build scripts twice
 422 # in parrallel
 423 PHONY += scripts
 424 scripts: scripts_basic include/config/MARKER
 425         $(Q)$(MAKE) $(build)=$(@)
 426
 427 scripts_basic: include/linux/autoconf.h
 428
 429 # Objects we will link into vmlinux / subdirs we need to visit
 430 init-y          := init/
 431 drivers-y       := drivers/ sound/
 432 net-y           := net/
 433 libs-y          := lib/
 434 core-y          := usr/
 435 endif # KBUILD_EXTMOD
 436
 437 ifeq ($(dot-config),1)
 438 # In this section, we need .config
 439
 440 # Read in dependencies to all Kconfig* files, make sure to run
 441 # oldconfig if changes are detected.
 442 -include .kconfig.d
 443
 444 include .config
 445
 446 # If .config needs to be updated, it will be done via the dependency
 447 # that autoconf has on .config.
 448 # To avoid any implicit rule to kick in, define an empty command
 449 .config .kconfig.d: ;
 450
 451 # If .config is newer than include/linux/autoconf.h, someone tinkered
 452 # with it and forgot to run make oldconfig.
 453 # If kconfig.d is missing then we are probarly in a cleaned tree so
 454 # we execute the config step to be sure to catch updated Kconfig files
 455 include/linux/autoconf.h: .kconfig.d .config
 456         $(Q)mkdir -p include/linux
 457         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 458 else
 459 # Dummy target needed, because used as prerequisite
 460 include/linux/autoconf.h: ;
 461 endif
 462
 463 # The all: target is the default when no target is given on the
 464 # command line.
 465 # This allow a user to issue only 'make' to build a kernel including modules
 466 # Defaults vmlinux but it is usually overriden in the arch makefile
 467 all: vmlinux
 468
 469 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 470 CFLAGS          += -Os
 471 else
 472 CFLAGS          += -O2
 473 endif
 474
 475 ifdef CONFIG_FRAME_POINTER
 476 CFLAGS          += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 477 else
 478 CFLAGS          += -fomit-frame-pointer
 479 endif
 480
 481 ifdef CONFIG_DEBUG_INFO
 482 CFLAGS          += -g
 483 endif
 484
 485 include $(srctree)/arch/$(ARCH)/Makefile
 486
 487 # arch Makefile may override CC so keep this after arch Makefile is included
 488 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 489 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 490
 491 # warn about C99 declaration after statement
 492 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 493
 494 # disable pointer signedness warnings in gcc 4.0
 495 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 496
 497 # Default kernel image to build when no specific target is given.
 498 # KBUILD_IMAGE may be overruled on the commandline or
 499 # set in the environment
 500 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 501 # this default value
 502 export KBUILD_IMAGE ?= vmlinux
 503
 504 #
 505 # INSTALL_PATH specifies where to place the updated kernel and system map
 506 # images. Default is /boot, but you can set it to other values
 507 export  INSTALL_PATH ?= /boot
 508
 509 #
 510 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 511 # relocations required by build roots.  This is not defined in the
 512 # makefile but the arguement can be passed to make if needed.
 513 #
 514
 515 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 516 export MODLIB
 517
 518
 519 ifeq ($(KBUILD_EXTMOD),)
 520 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 521
 522 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 523                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 524                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 525
 526 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 527                      $(init-n) $(init-) \
 528                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 529                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 530
 531 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 532 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 533 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 534 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 535 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 536 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 537 libs-y          := $(libs-y1) $(libs-y2)
 538
 539 # Build vmlinux
 540 # ---------------------------------------------------------------------------
 541 # vmlinux is build from the objects selected by $(vmlinux-init) and
 542 # $(vmlinux-main). Most are built-in.o files from top-level directories
 543 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 544 # Ordering when linking is important, and $(vmlinux-init) must be first.
 545 #
 546 # vmlinux
 547 #   ^
 548 #   |
 549 #   +-< $(vmlinux-init)
 550 #   |   +--< init/version.o + more
 551 #   |
 552 #   +--< $(vmlinux-main)
 553 #   |    +--< driver/built-in.o mm/built-in.o + more
 554 #   |
 555 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 556 #
 557 # vmlinux version (uname -v) cannot be updated during normal
 558 # descending-into-subdirs phase since we do not yet know if we need to
 559 # update vmlinux.
 560 # Therefore this step is delayed until just before final link of vmlinux -
 561 # except in the kallsyms case where it is done just before adding the
 562 # symbols to the kernel.
 563 #
 564 # System.map is generated to document addresses of all kernel symbols
 565
 566 vmlinux-init := $(head-y) $(init-y)
 567 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 568 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 569 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 570
 571 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 572 # May be overridden by arch/$(ARCH)/Makefile
 573 quiet_cmd_vmlinux__ ?= LD      $@
 574       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 575       -T $(vmlinux-lds) $(vmlinux-init)                          \
 576       --start-group $(vmlinux-main) --end-group                  \
 577       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 578
 579 # Generate new vmlinux version
 580 quiet_cmd_vmlinux_version = GEN     .version
 581       cmd_vmlinux_version = set -e;                     \
 582         if [ ! -r .version ]; then                      \
 583           rm -f .version;                               \
 584           echo 1 >.version;                             \
 585         else                                            \
 586           mv .version .old_version;                     \
 587           expr 0$$(cat .old_version) + 1 >.version;     \
 588         fi;                                             \
 589         $(MAKE) $(build)=init
 590
 591 # Generate System.map
 592 quiet_cmd_sysmap = SYSMAP
 593       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 594
 595 # Link of vmlinux
 596 # If CONFIG_KALLSYMS is set .version is already updated
 597 # Generate System.map and verify that the content is consistent
 598 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 599 # First command is ':' to allow us to use + in front of the rule
 600 define rule_vmlinux__
 601         :
 602         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 603
 604         $(call cmd,vmlinux__)
 605         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 606
 607         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 608           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 609         $(cmd_sysmap) $@ System.map;                    \
 610         if [ $$? -ne 0 ]; then                          \
 611                 rm -f $@;                               \
 612                 /bin/false;                             \
 613         fi;
 614         $(verify_kallsyms)
 615 endef
 616
 617
 618 ifdef CONFIG_KALLSYMS
 619 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 620 # It's a three stage process:
 621 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 622 #   empty
 623 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 624 #   the right size - vmlinux version (uname -v) is updated during this step
 625 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 626 #   but due to the added section, some addresses have shifted.
 627 #   From here, we generate a correct .tmp_kallsyms2.o
 628 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 629 # o Verify that the System.map from vmlinux matches the map from
 630 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 631 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 632 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 633 #   temporary bypass to allow the kernel to be built while the
 634 #   maintainers work out what went wrong with kallsyms.
 635
 636 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 637 last_kallsyms := 3
 638 else
 639 last_kallsyms := 2
 640 endif
 641
 642 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 643
 644 define verify_kallsyms
 645         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 646           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 647           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 648         $(Q)cmp -s System.map .tmp_System.map ||              \
 649                 (echo Inconsistent kallsyms data;             \
 650                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 651                  rm .tmp_kallsyms* ; /bin/false )
 652 endef
 653
 654 # Update vmlinux version before link
 655 # Use + in front of this rule to silent warning about make -j1
 656 # First command is ':' to allow us to use + in front of this rule
 657 cmd_ksym_ld = $(cmd_vmlinux__)
 658 define rule_ksym_ld
 659         :
 660         +$(call cmd,vmlinux_version)
 661         $(call cmd,vmlinux__)
 662         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 663 endef
 664
 665 # Generate .S file with all kernel symbols
 666 quiet_cmd_kallsyms = KSYM    $@
 667       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 668                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 669
 670 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 671         $(call if_changed_dep,as_o_S)
 672
 673 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 674         $(call cmd,kallsyms)
 675
 676 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 677 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 678         $(call if_changed_rule,ksym_ld)
 679
 680 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 681         $(call if_changed,vmlinux__)
 682
 683 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 684         $(call if_changed,vmlinux__)
 685
 686 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 687 $(KALLSYMS): scripts ;
 688
 689 # Generate some data for debugging strange kallsyms problems
 690 debug_kallsyms: .tmp_map$(last_kallsyms)
 691
 692 .tmp_map%: .tmp_vmlinux% FORCE
 693         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 694
 695 .tmp_map3: .tmp_map2
 696
 697 .tmp_map2: .tmp_map1
 698
 699 endif # ifdef CONFIG_KALLSYMS
 700
 701 # vmlinux image - including updated kernel symbols
 702 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 703         $(call if_changed_rule,vmlinux__)
 704         $(Q)rm -f .old_version
 705
 706 # The actual objects are generated when descending,
 707 # make sure no implicit rule kicks in
 708 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 709
 710 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 711 # Preset locale variables to speed up the build process. Limit locale
 712 # tweaks to this spot to avoid wrong language settings when running
 713 # make menuconfig etc.
 714 # Error messages still appears in the original language
 715
 716 PHONY += $(vmlinux-dirs)
 717 $(vmlinux-dirs): prepare scripts
 718         $(Q)$(MAKE) $(build)=$@
 719
 720 # Build the kernel release string
 721 # The KERNELRELEASE is stored in a file named .kernelrelease
 722 # to be used when executing for example make install or make modules_install
 723 #
 724 # Take the contents of any files called localversion* and the config
 725 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
 726 # LOCALVERSION from the command line override all of this
 727
 728 nullstring :=
 729 space      := $(nullstring) # end of line
 730
 731 ___localver = $(objtree)/localversion* $(srctree)/localversion*
 732 __localver  = $(sort $(wildcard $(___localver)))
 733 # skip backup files (containing '~')
 734 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
 735
 736 localver = $(subst $(space),, \
 737            $(shell cat /dev/null $(_localver)) \
 738            $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 739
 740 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 741 # and if the SCM is know a tag from the SCM is appended.
 742 # The appended tag is determinded by the SCM used.
 743 #
 744 # Currently, only git is supported.
 745 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 746 # checks as needed.
 747 ifdef CONFIG_LOCALVERSION_AUTO
 748         _localver-auto = $(shell $(CONFIG_SHELL) \
 749                           $(srctree)/scripts/setlocalversion $(srctree))
 750         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 751 endif
 752
 753 localver-full = $(localver)$(localver-auto)
 754
 755 # Store (new) KERNELRELASE string in .kernelrelease
 756 kernelrelease = $(KERNELVERSION)$(localver-full)
 757 .kernelrelease: FORCE
 758         $(Q)rm -f $@
 759         $(Q)echo $(kernelrelease) > $@
 760
 761
 762 # Things we need to do before we recursively start building the kernel
 763 # or the modules are listed in "prepare".
 764 # A multi level approach is used. prepareN is processed before prepareN-1.
 765 # archprepare is used in arch Makefiles and when processed asm symlink,
 766 # version.h and scripts_basic is processed / created.
 767
 768 # Listed in dependency order
 769 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 770
 771 # prepare-all is deprecated, use prepare as valid replacement
 772 PHONY += prepare-all
 773
 774 # prepare3 is used to check if we are building in a separate output directory,
 775 # and if so do:
 776 # 1) Check that make has not been executed in the kernel src $(srctree)
 777 # 2) Create the include2 directory, used for the second asm symlink
 778 prepare3: .kernelrelease
 779 ifneq ($(KBUILD_SRC),)
 780         @echo '  Using $(srctree) as source for kernel'
 781         $(Q)if [ -f $(srctree)/.config ]; then \
 782                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 783                 echo "  in the '$(srctree)' directory.";\
 784                 /bin/false; \
 785         fi;
 786         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 787         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 788 endif
 789
 790 # prepare2 creates a makefile if using a separate output directory
 791 prepare2: prepare3 outputmakefile
 792
 793 prepare1: prepare2 include/linux/version.h include/asm \
 794                    include/config/MARKER
 795 ifneq ($(KBUILD_MODULES),)
 796         $(Q)rm -rf $(MODVERDIR)
 797         $(Q)mkdir -p $(MODVERDIR)
 798 endif
 799
 800 archprepare: prepare1 scripts_basic
 801
 802 prepare0: archprepare FORCE
 803         $(Q)$(MAKE) $(build)=.
 804
 805 # All the preparing..
 806 prepare prepare-all: prepare0
 807
 808 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 809 #       done in arch/$(ARCH)/kernel/Makefile
 810
 811 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 812
 813 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 814 #       hard to detect, but I suppose "make mrproper" is a good idea
 815 #       before switching between archs anyway.
 816
 817 include/asm:
 818         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 819         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 820         @ln -fsn asm-$(ARCH) $@
 821
 822 #       Split autoconf.h into include/linux/config/*
 823
 824 include/config/MARKER: scripts/basic/split-include include/linux/autoconf.h
 825         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 826         @scripts/basic/split-include include/linux/autoconf.h include/config
 827         @touch $@
 828
 829 # Generate some files
 830 # ---------------------------------------------------------------------------
 831
 832 # KERNELRELEASE can change from a few different places, meaning version.h
 833 # needs to be updated, so this check is forced on all builds
 834
 835 uts_len := 64
 836
 837 define filechk_version.h
 838         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 839           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 840           exit 1; \
 841         fi; \
 842         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 843           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 844          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 845         )
 846 endef
 847
 848 include/linux/version.h: $(srctree)/Makefile .config .kernelrelease FORCE
 849         $(call filechk,version.h)
 850
 851 # ---------------------------------------------------------------------------
 852
 853 PHONY += depend dep
 854 depend dep:
 855         @echo '*** Warning: make $@ is unnecessary now.'
 856
 857 # ---------------------------------------------------------------------------
 858 # Modules
 859
 860 ifdef CONFIG_MODULES
 861
 862 #       By default, build modules as well
 863
 864 all: modules
 865
 866 #       Build modules
 867
 868 PHONY += modules
 869 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 870         @echo '  Building modules, stage 2.';
 871         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 872
 873
 874 # Target to prepare building external modules
 875 PHONY += modules_prepare
 876 modules_prepare: prepare scripts
 877
 878 # Target to install modules
 879 PHONY += modules_install
 880 modules_install: _modinst_ _modinst_post
 881
 882 PHONY += _modinst_
 883 _modinst_:
 884         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 885                 echo "Warning: you may need to install module-init-tools"; \
 886                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 887                 sleep 1; \
 888         fi
 889         @rm -rf $(MODLIB)/kernel
 890         @rm -f $(MODLIB)/source
 891         @mkdir -p $(MODLIB)/kernel
 892         @ln -s $(srctree) $(MODLIB)/source
 893         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 894                 rm -f $(MODLIB)/build ; \
 895                 ln -s $(objtree) $(MODLIB)/build ; \
 896         fi
 897         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 898
 899 # If System.map exists, run depmod.  This deliberately does not have a
 900 # dependency on System.map since that would run the dependency tree on
 901 # vmlinux.  This depmod is only for convenience to give the initial
 902 # boot a modules.dep even before / is mounted read-write.  However the
 903 # boot script depmod is the master version.
 904 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 905 depmod_opts     :=
 906 else
 907 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 908 endif
 909 PHONY += _modinst_post
 910 _modinst_post: _modinst_
 911         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 912
 913 else # CONFIG_MODULES
 914
 915 # Modules not configured
 916 # ---------------------------------------------------------------------------
 917
 918 modules modules_install: FORCE
 919         @echo
 920         @echo "The present kernel configuration has modules disabled."
 921         @echo "Type 'make config' and enable loadable module support."
 922         @echo "Then build a kernel with module support enabled."
 923         @echo
 924         @exit 1
 925
 926 endif # CONFIG_MODULES
 927
 928 ###
 929 # Cleaning is done on three levels.
 930 # make clean     Delete most generated files
 931 #                Leave enough to build external modules
 932 # make mrproper  Delete the current configuration, and all generated files
 933 # make distclean Remove editor backup files, patch leftover files and the like
 934
 935 # Directories & files removed with 'make clean'
 936 CLEAN_DIRS  += $(MODVERDIR)
 937 CLEAN_FILES +=  vmlinux System.map \
 938                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 939
 940 # Directories & files removed with 'make mrproper'
 941 MRPROPER_DIRS  += include/config include2
 942 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
 943                   include/linux/autoconf.h include/linux/version.h \
 944                   .kernelrelease Module.symvers tags TAGS cscope*
 945
 946 # clean - Delete most, but leave enough to build external modules
 947 #
 948 clean: rm-dirs  := $(CLEAN_DIRS)
 949 clean: rm-files := $(CLEAN_FILES)
 950 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
 951
 952 PHONY += $(clean-dirs) clean archclean
 953 $(clean-dirs):
 954         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 955
 956 clean: archclean $(clean-dirs)
 957         $(call cmd,rmdirs)
 958         $(call cmd,rmfiles)
 959         @find . $(RCS_FIND_IGNORE) \
 960                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 961                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 962                 -type f -print | xargs rm -f
 963
 964 # mrproper - Delete all generated files, including .config
 965 #
 966 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 967 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 968 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
 969
 970 PHONY += $(mrproper-dirs) mrproper archmrproper
 971 $(mrproper-dirs):
 972         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 973
 974 mrproper: clean archmrproper $(mrproper-dirs)
 975         $(call cmd,rmdirs)
 976         $(call cmd,rmfiles)
 977
 978 # distclean
 979 #
 980 PHONY += distclean
 981
 982 distclean: mrproper
 983         @find $(srctree) $(RCS_FIND_IGNORE) \
 984                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 985                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 986                 -o -name '.*.rej' -o -size 0 \
 987                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
 988                 -type f -print | xargs rm -f
 989
 990
 991 # Packaging of the kernel to various formats
 992 # ---------------------------------------------------------------------------
 993 # rpm target kept for backward compatibility
 994 package-dir     := $(srctree)/scripts/package
 995
 996 %pkg: FORCE
 997         $(Q)$(MAKE) $(build)=$(package-dir) $@
 998 rpm: FORCE
 999         $(Q)$(MAKE) $(build)=$(package-dir) $@
1000
1001
1002 # Brief documentation of the typical targets used
1003 # ---------------------------------------------------------------------------
1004
1005 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1006 boards := $(notdir $(boards))
1007
1008 help:
1009         @echo  'Cleaning targets:'
1010         @echo  '  clean           - remove most generated files but keep the config'
1011         @echo  '  mrproper        - remove all generated files + config + various backup files'
1012         @echo  ''
1013         @echo  'Configuration targets:'
1014         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1015         @echo  ''
1016         @echo  'Other generic targets:'
1017         @echo  '  all             - Build all targets marked with [*]'
1018         @echo  '* vmlinux         - Build the bare kernel'
1019         @echo  '* modules         - Build all modules'
1020         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1021         @echo  '  dir/            - Build all files in dir and below'
1022         @echo  '  dir/file.[ois]  - Build specified target only'
1023         @echo  '  dir/file.ko     - Build module including final link'
1024         @echo  '  rpm             - Build a kernel as an RPM package'
1025         @echo  '  tags/TAGS       - Generate tags file for editors'
1026         @echo  '  cscope          - Generate cscope index'
1027         @echo  '  kernelrelease   - Output the release version string'
1028         @echo  '  kernelversion   - Output the version stored in Makefile'
1029         @echo  ''
1030         @echo  'Static analysers'
1031         @echo  '  buildcheck      - List dangling references to vmlinux discarded sections'
1032         @echo  '                    and init sections from non-init sections'
1033         @echo  '  checkstack      - Generate a list of stack hogs'
1034         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1035         @echo  ''
1036         @echo  'Kernel packaging:'
1037         @$(MAKE) $(build)=$(package-dir) help
1038         @echo  ''
1039         @echo  'Documentation targets:'
1040         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1041         @echo  ''
1042         @echo  'Architecture specific targets ($(ARCH)):'
1043         @$(if $(archhelp),$(archhelp),\
1044                 echo '  No architecture specific help defined for $(ARCH)')
1045         @echo  ''
1046         @$(if $(boards), \
1047                 $(foreach b, $(boards), \
1048                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1049                 echo '')
1050
1051         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1052         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1053         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1054         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1055         @echo  ''
1056         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1057         @echo  'For further info see the ./README file'
1058
1059
1060 # Documentation targets
1061 # ---------------------------------------------------------------------------
1062 %docs: scripts_basic FORCE
1063         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1064
1065 else # KBUILD_EXTMOD
1066
1067 ###
1068 # External module support.
1069 # When building external modules the kernel used as basis is considered
1070 # read-only, and no consistency checks are made and the make
1071 # system is not used on the basis kernel. If updates are required
1072 # in the basis kernel ordinary make commands (without M=...) must
1073 # be used.
1074 #
1075 # The following are the only valid targets when building external
1076 # modules.
1077 # make M=dir clean     Delete all automatically generated files
1078 # make M=dir modules   Make all modules in specified dir
1079 # make M=dir           Same as 'make M=dir modules'
1080 # make M=dir modules_install
1081 #                      Install the modules build in the module directory
1082 #                      Assumes install directory is already created
1083
1084 # We are always building modules
1085 KBUILD_MODULES := 1
1086 PHONY += crmodverdir
1087 crmodverdir:
1088         $(Q)rm -rf $(MODVERDIR)
1089         $(Q)mkdir -p $(MODVERDIR)
1090
1091 PHONY += $(objtree)/Module.symvers
1092 $(objtree)/Module.symvers:
1093         @test -e $(objtree)/Module.symvers || ( \
1094         echo; \
1095         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1096         echo "           is missing; modules will have no dependencies and modversions."; \
1097         echo )
1098
1099 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1100 PHONY += $(module-dirs) modules
1101 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1102         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1103
1104 modules: $(module-dirs)
1105         @echo '  Building modules, stage 2.';
1106         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1107
1108 PHONY += modules_install
1109 modules_install: _emodinst_ _emodinst_post
1110
1111 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1112 PHONY += _emodinst_
1113 _emodinst_:
1114         $(Q)rm -rf $(MODLIB)/$(install-dir)
1115         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1116         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1117
1118 # Run depmod only is we have System.map and depmod is executable
1119 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1120       cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1121                       $(DEPMOD) -ae -F System.map             \
1122                       $(if $(strip $(INSTALL_MOD_PATH)),      \
1123                       -b $(INSTALL_MOD_PATH) -r)              \
1124                       $(KERNELRELEASE);                       \
1125                    fi
1126
1127 PHONY += _emodinst_post
1128 _emodinst_post: _emodinst_
1129         $(call cmd,depmod)
1130
1131 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1132
1133 PHONY += $(clean-dirs) clean
1134 $(clean-dirs):
1135         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1136
1137 clean:  rm-dirs := $(MODVERDIR)
1138 clean: $(clean-dirs)
1139         $(call cmd,rmdirs)
1140         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1141                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1142                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1143                 -type f -print | xargs rm -f
1144
1145 help:
1146         @echo  '  Building external modules.'
1147         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1148         @echo  ''
1149         @echo  '  modules         - default target, build the module(s)'
1150         @echo  '  modules_install - install the module'
1151         @echo  '  clean           - remove generated files in module directory only'
1152         @echo  ''
1153
1154 # Dummies...
1155 PHONY += prepare scripts
1156 prepare: ;
1157 scripts: ;
1158 endif # KBUILD_EXTMOD
1159
1160 # Generate tags for editors
1161 # ---------------------------------------------------------------------------
1162
1163 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1164 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1165 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1166
1167 ifeq ($(src),$(obj))
1168 __srctree =
1169 else
1170 __srctree = $(srctree)/
1171 endif
1172
1173 ifeq ($(ALLSOURCE_ARCHS),)
1174 ifeq ($(ARCH),um)
1175 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1176 else
1177 ALLINCLUDE_ARCHS := $(ARCH)
1178 endif
1179 else
1180 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1181 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1182 endif
1183
1184 ALLSOURCE_ARCHS := $(ARCH)
1185
1186 define all-sources
1187         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1188                \( -name include -o -name arch \) -prune -o \
1189                -name '*.[chS]' -print; \
1190           for ARCH in $(ALLSOURCE_ARCHS) ; do \
1191                find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1192                     -name '*.[chS]' -print; \
1193           done ; \
1194           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1195                -name '*.[chS]' -print; \
1196           find $(__srctree)include $(RCS_FIND_IGNORE) \
1197                \( -name config -o -name 'asm-*' \) -prune \
1198                -o -name '*.[chS]' -print; \
1199           for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1200                find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1201                     -name '*.[chS]' -print; \
1202           done ; \
1203           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1204                -name '*.[chS]' -print )
1205 endef
1206
1207 quiet_cmd_cscope-file = FILELST cscope.files
1208       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1209
1210 quiet_cmd_cscope = MAKE    cscope.out
1211       cmd_cscope = cscope -b
1212
1213 cscope: FORCE
1214         $(call cmd,cscope-file)
1215         $(call cmd,cscope)
1216
1217 quiet_cmd_TAGS = MAKE   $@
1218 define cmd_TAGS
1219         rm -f $@; \
1220         ETAGSF=`etags --version | grep -i exuberant >/dev/null &&     \
1221                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1222                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1223                       --extra=+f --c-kinds=+px"`;                     \
1224                 $(all-sources) | xargs etags $$ETAGSF -a
1225 endef
1226
1227 TAGS: FORCE
1228         $(call cmd,TAGS)
1229
1230
1231 quiet_cmd_tags = MAKE   $@
1232 define cmd_tags
1233         rm -f $@; \
1234         CTAGSF=`ctags --version | grep -i exuberant >/dev/null &&     \
1235                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1236                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1237                       --extra=+f --c-kinds=+px"`;                     \
1238                 $(all-sources) | xargs ctags $$CTAGSF -a
1239 endef
1240
1241 tags: FORCE
1242         $(call cmd,tags)
1243
1244
1245 # Scripts to check various things for consistency
1246 # ---------------------------------------------------------------------------
1247
1248 includecheck:
1249         find * $(RCS_FIND_IGNORE) \
1250                 -name '*.[hcS]' -type f -print | sort \
1251                 | xargs $(PERL) -w scripts/checkincludes.pl
1252
1253 versioncheck:
1254         find * $(RCS_FIND_IGNORE) \
1255                 -name '*.[hcS]' -type f -print | sort \
1256                 | xargs $(PERL) -w scripts/checkversion.pl
1257
1258 buildcheck:
1259         $(PERL) $(srctree)/scripts/reference_discarded.pl
1260         $(PERL) $(srctree)/scripts/reference_init.pl
1261
1262 namespacecheck:
1263         $(PERL) $(srctree)/scripts/namespace.pl
1264
1265 endif #ifeq ($(config-targets),1)
1266 endif #ifeq ($(mixed-targets),1)
1267
1268 PHONY += checkstack
1269 checkstack:
1270         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1271         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1272
1273 kernelrelease:
1274         $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1275         $(error kernelrelease not valid - run 'make *config' to update it))
1276 kernelversion:
1277         @echo $(KERNELVERSION)
1278
1279 # Single targets
1280 # ---------------------------------------------------------------------------
1281 # The directory part is taken from first prerequisite, so this
1282 # works even with external modules
1283 %.s: %.c prepare scripts FORCE
1284         $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1285 %.i: %.c prepare scripts FORCE
1286         $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1287 %.o: %.c prepare scripts FORCE
1288         $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1289 %.lst: %.c prepare scripts FORCE
1290         $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1291 %.s: %.S prepare scripts FORCE
1292         $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1293 %.o: %.S prepare scripts FORCE
1294         $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1295
1296 # For external modules we shall include any directory of the target,
1297 # but usual case there is no directory part.
1298 # make M=`pwd` module.o     => $(dir $@)=./
1299 # make M=`pwd` foo/module.o => $(dir $@)=foo/
1300 # make M=`pwd` /            => $(dir $@)=/
1301
1302 ifeq ($(KBUILD_EXTMOD),)
1303         target-dir = $(@D)
1304 else
1305         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1306         target-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1307 endif
1308
1309 / %/:      scripts prepare FORCE
1310         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1311         $(build)=$(target-dir)
1312 %.ko: scripts FORCE
1313         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1314         $(build)=$(target-dir) $(@:.ko=.o)
1315         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1316
1317 # FIXME Should go into a make.lib or something
1318 # ===========================================================================
1319
1320 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1321       cmd_rmdirs = rm -rf $(rm-dirs)
1322
1323 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1324       cmd_rmfiles = rm -f $(rm-files)
1325
1326
1327 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1328           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1329           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1330
1331 quiet_cmd_as_o_S = AS      $@
1332 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1333
1334 # read all saved command lines
1335
1336 targets := $(wildcard $(sort $(targets)))
1337 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1338
1339 ifneq ($(cmd_files),)
1340   $(cmd_files): ;       # Do not try to update included dependency files
1341   include $(cmd_files)
1342 endif
1343
1344 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1345 # Usage:
1346 # $(Q)$(MAKE) $(clean)=dir
1347 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1348
1349 endif   # skip-makefile
1350
1351 PHONY += FORCE
1352 FORCE:
1353
1354
1355 # Declare the contents of the .PHONY variable as phony.  We keep that
1356 # information in a variable se we can use it in if_changed and friends.
1357 .PHONY: $(PHONY)