Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 23
   4 EXTRAVERSION =
   5 NAME = Arr Matey! A Hairy Bilge Rat!
   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:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoid hard-to-debug behavour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # We are using a recursive build, so we need to do a little thinking
  20 # to get the ordering right.
  21 #
  22 # Most importantly: sub-Makefiles should only ever modify files in
  23 # their own directory. If in some directory we have a dependency on
  24 # a file in another dir (which doesn't happen often, but it's often
  25 # unavoidable when linking the built-in.o targets which finally
  26 # turn into vmlinux), we will call a sub make in that other dir, and
  27 # after that we are sure that everything which is in that other dir
  28 # is now up to date.
  29 #
  30 # The only cases where we need to modify files which have global
  31 # effects are thus separated out and done before the recursive
  32 # descending is started. They are now explicitly listed as the
  33 # prepare rule.
  34
  35 # To put more focus on warnings, be less verbose as default
  36 # Use 'make V=1' to see the full commands
  37
  38 ifdef V
  39   ifeq ("$(origin V)", "command line")
  40     KBUILD_VERBOSE = $(V)
  41   endif
  42 endif
  43 ifndef KBUILD_VERBOSE
  44   KBUILD_VERBOSE = 0
  45 endif
  46
  47 # Call a source code checker (by default, "sparse") as part of the
  48 # C compilation.
  49 #
  50 # Use 'make C=1' to enable checking of only re-compiled files.
  51 # Use 'make C=2' to enable checking of *all* source files, regardless
  52 # of whether they are re-compiled or not.
  53 #
  54 # See the file "Documentation/sparse.txt" for more details, including
  55 # where to get the "sparse" utility.
  56
  57 ifdef C
  58   ifeq ("$(origin C)", "command line")
  59     KBUILD_CHECKSRC = $(C)
  60   endif
  61 endif
  62 ifndef KBUILD_CHECKSRC
  63   KBUILD_CHECKSRC = 0
  64 endif
  65
  66 # Use make M=dir to specify directory of external module to build
  67 # Old syntax make ... SUBDIRS=$PWD is still supported
  68 # Setting the environment variable KBUILD_EXTMOD take precedence
  69 ifdef SUBDIRS
  70   KBUILD_EXTMOD ?= $(SUBDIRS)
  71 endif
  72 ifdef M
  73   ifeq ("$(origin M)", "command line")
  74     KBUILD_EXTMOD := $(M)
  75   endif
  76 endif
  77
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(KBUILD_SRC),)
  98
  99 # OK, Make called in directory where kernel src resides
 100 # Do we want to locate output files in a separate directory?
 101 ifdef O
 102   ifeq ("$(origin O)", "command line")
 103     KBUILD_OUTPUT := $(O)
 104   endif
 105 endif
 106
 107 # That's our default target when none is given on the command line
 108 PHONY := _all
 109 _all:
 110
 111 ifneq ($(KBUILD_OUTPUT),)
 112 # Invoke a second make in the output directory, passing relevant variables
 113 # check that the output directory actually exists
 114 saved-output := $(KBUILD_OUTPUT)
 115 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 116 $(if $(KBUILD_OUTPUT),, \
 117      $(error output directory "$(saved-output)" does not exist))
 118 # Check that OUTPUT directory is not the same as where we have kernel src
 119 $(if $(filter-out $(KBUILD_OUTPUT),$(shell /bin/pwd)),, \
 120      $(error Output directory (O=...) specifies kernel src dir))
 121 PHONY += $(MAKECMDGOALS)
 122
 123 $(filter-out _all,$(MAKECMDGOALS)) _all:
 124         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 125         KBUILD_SRC=$(CURDIR) \
 126         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
 127
 128 # Leave processing to above invocation of make
 129 skip-makefile := 1
 130 endif # ifneq ($(KBUILD_OUTPUT),)
 131 endif # ifeq ($(KBUILD_SRC),)
 132
 133 # We process the rest of the Makefile if this is the final invocation of make
 134 ifeq ($(skip-makefile),)
 135
 136 # If building an external module we do not care about the all: rule
 137 # but instead _all depend on modules
 138 PHONY += all
 139 ifeq ($(KBUILD_EXTMOD),)
 140 _all: all
 141 else
 142 _all: modules
 143 endif
 144
 145 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 146 TOPDIR          := $(srctree)
 147 # FIXME - TOPDIR is obsolete, use srctree/objtree
 148 objtree         := $(CURDIR)
 149 src             := $(srctree)
 150 obj             := $(objtree)
 151
 152 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 153
 154 export srctree objtree VPATH TOPDIR
 155
 156
 157 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 158 # first, and if a usermode build is happening, the "ARCH=um" on the command
 159 # line overrides the setting of ARCH below.  If a native build is happening,
 160 # then ARCH is assigned, getting whatever value it gets normally, and
 161 # SUBARCH is subsequently ignored.
 162
 163 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 164                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 165                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 166                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
 167
 168 # Cross compiling and selecting different set of gcc/bin-utils
 169 # ---------------------------------------------------------------------------
 170 #
 171 # When performing cross compilation for other architectures ARCH shall be set
 172 # to the target architecture. (See arch/* for the possibilities).
 173 # ARCH can be set during invocation of make:
 174 # make ARCH=ia64
 175 # Another way is to have ARCH set in the environment.
 176 # The default ARCH is the host where make is executed.
 177
 178 # CROSS_COMPILE specify the prefix used for all executables used
 179 # during compilation. Only gcc and related bin-utils executables
 180 # are prefixed with $(CROSS_COMPILE).
 181 # CROSS_COMPILE can be set on the command line
 182 # make CROSS_COMPILE=ia64-linux-
 183 # Alternatively CROSS_COMPILE can be set in the environment.
 184 # Default value for CROSS_COMPILE is not to prefix executables
 185 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 186
 187 ARCH            ?= $(SUBARCH)
 188 CROSS_COMPILE   ?=
 189
 190 # Architecture as present in compile.h
 191 UTS_MACHINE     := $(ARCH)
 192 SRCARCH         := $(ARCH)
 193
 194 KCONFIG_CONFIG  ?= .config
 195
 196 # SHELL used by kbuild
 197 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 198           else if [ -x /bin/bash ]; then echo /bin/bash; \
 199           else echo sh; fi ; fi)
 200
 201 HOSTCC       = gcc
 202 HOSTCXX      = g++
 203 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 204 HOSTCXXFLAGS = -O2
 205
 206 # Decide whether to build built-in, modular, or both.
 207 # Normally, just do built-in.
 208
 209 KBUILD_MODULES :=
 210 KBUILD_BUILTIN := 1
 211
 212 #       If we have only "make modules", don't compile built-in objects.
 213 #       When we're building modules with modversions, we need to consider
 214 #       the built-in objects during the descend as well, in order to
 215 #       make sure the checksums are up to date before we record them.
 216
 217 ifeq ($(MAKECMDGOALS),modules)
 218   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 219 endif
 220
 221 #       If we have "make <whatever> modules", compile modules
 222 #       in addition to whatever we do anyway.
 223 #       Just "make" or "make all" shall build modules as well
 224
 225 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 226   KBUILD_MODULES := 1
 227 endif
 228
 229 ifeq ($(MAKECMDGOALS),)
 230   KBUILD_MODULES := 1
 231 endif
 232
 233 export KBUILD_MODULES KBUILD_BUILTIN
 234 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 235
 236 # Beautify output
 237 # ---------------------------------------------------------------------------
 238 #
 239 # Normally, we echo the whole command before executing it. By making
 240 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 241 # $(quiet) to choose other forms of output instead, e.g.
 242 #
 243 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 244 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 245 #
 246 # If $(quiet) is empty, the whole command will be printed.
 247 # If it is set to "quiet_", only the short version will be printed.
 248 # If it is set to "silent_", nothing will be printed at all, since
 249 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 250 #
 251 # A simple variant is to prefix commands with $(Q) - that's useful
 252 # for commands that shall be hidden in non-verbose mode.
 253 #
 254 #       $(Q)ln $@ :<
 255 #
 256 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 257 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 258
 259 ifeq ($(KBUILD_VERBOSE),1)
 260   quiet =
 261   Q =
 262 else
 263   quiet=quiet_
 264   Q = @
 265 endif
 266
 267 # If the user is running make -s (silent mode), suppress echoing of
 268 # commands
 269
 270 ifneq ($(findstring s,$(MAKEFLAGS)),)
 271   quiet=silent_
 272 endif
 273
 274 export quiet Q KBUILD_VERBOSE
 275
 276
 277 # Look for make include files relative to root of kernel src
 278 MAKEFLAGS += --include-dir=$(srctree)
 279
 280 # We need some generic definitions.
 281 include $(srctree)/scripts/Kbuild.include
 282
 283 # Make variables (CC, etc...)
 284
 285 AS              = $(CROSS_COMPILE)as
 286 LD              = $(CROSS_COMPILE)ld
 287 CC              = $(CROSS_COMPILE)gcc
 288 CPP             = $(CC) -E
 289 AR              = $(CROSS_COMPILE)ar
 290 NM              = $(CROSS_COMPILE)nm
 291 STRIP           = $(CROSS_COMPILE)strip
 292 OBJCOPY         = $(CROSS_COMPILE)objcopy
 293 OBJDUMP         = $(CROSS_COMPILE)objdump
 294 AWK             = awk
 295 GENKSYMS        = scripts/genksyms/genksyms
 296 DEPMOD          = /sbin/depmod
 297 KALLSYMS        = scripts/kallsyms
 298 PERL            = perl
 299 CHECK           = sparse
 300
 301 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 302 MODFLAGS        = -DMODULE
 303 CFLAGS_MODULE   = $(MODFLAGS)
 304 AFLAGS_MODULE   = $(MODFLAGS)
 305 LDFLAGS_MODULE  =
 306 CFLAGS_KERNEL   =
 307 AFLAGS_KERNEL   =
 308
 309
 310 # Use LINUXINCLUDE when you must reference the include/ directory.
 311 # Needed to be compatible with the O= option
 312 LINUXINCLUDE    := -Iinclude \
 313                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 314                    -include include/linux/autoconf.h
 315
 316 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 317
 318 CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 319                    -fno-strict-aliasing -fno-common \
 320                    -Werror-implicit-function-declaration
 321 AFLAGS          := -D__ASSEMBLY__
 322
 323 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 324 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 325 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 326
 327 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 328 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 329 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 330 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 331
 332 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 333 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 334 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 335
 336 # When compiling out-of-tree modules, put MODVERDIR in the module
 337 # tree rather than in the kernel tree. The kernel tree might
 338 # even be read-only.
 339 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 340
 341 # Files to ignore in find ... statements
 342
 343 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
 344 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 345
 346 # ===========================================================================
 347 # Rules shared between *config targets and build targets
 348
 349 # Basic helpers built in scripts/
 350 PHONY += scripts_basic
 351 scripts_basic:
 352         $(Q)$(MAKE) $(build)=scripts/basic
 353
 354 # To avoid any implicit rule to kick in, define an empty command.
 355 scripts/basic/%: scripts_basic ;
 356
 357 PHONY += outputmakefile
 358 # outputmakefile generates a Makefile in the output directory, if using a
 359 # separate output directory. This allows convenient use of make in the
 360 # output directory.
 361 outputmakefile:
 362 ifneq ($(KBUILD_SRC),)
 363         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 364             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 365 endif
 366
 367 # To make sure we do not include .config for any of the *config targets
 368 # catch them early, and hand them over to scripts/kconfig/Makefile
 369 # It is allowed to specify more targets when calling make, including
 370 # mixing *config targets and build targets.
 371 # For example 'make oldconfig all'.
 372 # Detect when mixed targets is specified, and make a second invocation
 373 # of make so .config is not included in this case either (for *config).
 374
 375 no-dot-config-targets := clean mrproper distclean \
 376                          cscope TAGS tags help %docs check% \
 377                          include/linux/version.h headers_% \
 378                          kernelrelease kernelversion
 379
 380 config-targets := 0
 381 mixed-targets  := 0
 382 dot-config     := 1
 383
 384 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 385         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 386                 dot-config := 0
 387         endif
 388 endif
 389
 390 ifeq ($(KBUILD_EXTMOD),)
 391         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 392                 config-targets := 1
 393                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 394                         mixed-targets := 1
 395                 endif
 396         endif
 397 endif
 398
 399 ifeq ($(mixed-targets),1)
 400 # ===========================================================================
 401 # We're called with mixed targets (*config and build targets).
 402 # Handle them one by one.
 403
 404 %:: FORCE
 405         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 406
 407 else
 408 ifeq ($(config-targets),1)
 409 # ===========================================================================
 410 # *config targets only - make sure prerequisites are updated, and descend
 411 # in scripts/kconfig to make the *config target
 412
 413 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 414 # KBUILD_DEFCONFIG may point out an alternative default configuration
 415 # used for 'make defconfig'
 416 include $(srctree)/arch/$(ARCH)/Makefile
 417 export KBUILD_DEFCONFIG
 418
 419 config %config: scripts_basic outputmakefile FORCE
 420         $(Q)mkdir -p include/linux include/config
 421         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 422
 423 else
 424 # ===========================================================================
 425 # Build targets only - this includes vmlinux, arch specific targets, clean
 426 # targets and others. In general all targets except *config targets.
 427
 428 ifeq ($(KBUILD_EXTMOD),)
 429 # Additional helpers built in scripts/
 430 # Carefully list dependencies so we do not try to build scripts twice
 431 # in parallel
 432 PHONY += scripts
 433 scripts: scripts_basic include/config/auto.conf
 434         $(Q)$(MAKE) $(build)=$(@)
 435
 436 # Objects we will link into vmlinux / subdirs we need to visit
 437 init-y          := init/
 438 drivers-y       := drivers/ sound/
 439 net-y           := net/
 440 libs-y          := lib/
 441 core-y          := usr/
 442 endif # KBUILD_EXTMOD
 443
 444 ifeq ($(dot-config),1)
 445 # Read in config
 446 -include include/config/auto.conf
 447
 448 ifeq ($(KBUILD_EXTMOD),)
 449 # Read in dependencies to all Kconfig* files, make sure to run
 450 # oldconfig if changes are detected.
 451 -include include/config/auto.conf.cmd
 452
 453 # To avoid any implicit rule to kick in, define an empty command
 454 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 455
 456 # If .config is newer than include/config/auto.conf, someone tinkered
 457 # with it and forgot to run make oldconfig.
 458 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 459 # we execute the config step to be sure to catch updated Kconfig files
 460 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 461         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 462 else
 463 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 464 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 465 PHONY += include/config/auto.conf
 466
 467 include/config/auto.conf:
 468         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 469         echo;                                                           \
 470         echo "  ERROR: Kernel configuration is invalid.";               \
 471         echo "         include/linux/autoconf.h or $@ are missing.";    \
 472         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 473         echo;                                                           \
 474         /bin/false)
 475
 476 endif # KBUILD_EXTMOD
 477
 478 else
 479 # Dummy target needed, because used as prerequisite
 480 include/config/auto.conf: ;
 481 endif # $(dot-config)
 482
 483 # The all: target is the default when no target is given on the
 484 # command line.
 485 # This allow a user to issue only 'make' to build a kernel including modules
 486 # Defaults vmlinux but it is usually overridden in the arch makefile
 487 all: vmlinux
 488
 489 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 490 CFLAGS          += -Os
 491 else
 492 CFLAGS          += -O2
 493 endif
 494
 495 include $(srctree)/arch/$(ARCH)/Makefile
 496
 497 ifdef CONFIG_FRAME_POINTER
 498 CFLAGS          += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 499 else
 500 CFLAGS          += -fomit-frame-pointer
 501 endif
 502
 503 ifdef CONFIG_DEBUG_INFO
 504 CFLAGS          += -g
 505 AFLAGS          += -gdwarf-2
 506 endif
 507
 508 # Force gcc to behave correct even for buggy distributions
 509 CFLAGS          += $(call cc-option, -fno-stack-protector)
 510
 511 # arch Makefile may override CC so keep this after arch Makefile is included
 512 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 513 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 514
 515 # warn about C99 declaration after statement
 516 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 517
 518 # disable pointer signed / unsigned warnings in gcc 4.0
 519 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 520
 521 # Use --build-id when available.
 522 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 523                               $(call ld-option, -Wl$(comma)--build-id,))
 524 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 525 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 526
 527 # Default kernel image to build when no specific target is given.
 528 # KBUILD_IMAGE may be overruled on the command line or
 529 # set in the environment
 530 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 531 # this default value
 532 export KBUILD_IMAGE ?= vmlinux
 533
 534 #
 535 # INSTALL_PATH specifies where to place the updated kernel and system map
 536 # images. Default is /boot, but you can set it to other values
 537 export  INSTALL_PATH ?= /boot
 538
 539 #
 540 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 541 # relocations required by build roots.  This is not defined in the
 542 # makefile but the argument can be passed to make if needed.
 543 #
 544
 545 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 546 export MODLIB
 547
 548 #
 549 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 550 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 551 #  the default option --strip-debug will be used.  Otherwise,
 552 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 553
 554 ifdef INSTALL_MOD_STRIP
 555 ifeq ($(INSTALL_MOD_STRIP),1)
 556 mod_strip_cmd = $(STRIP) --strip-debug
 557 else
 558 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 559 endif # INSTALL_MOD_STRIP=1
 560 else
 561 mod_strip_cmd = true
 562 endif # INSTALL_MOD_STRIP
 563 export mod_strip_cmd
 564
 565
 566 ifeq ($(KBUILD_EXTMOD),)
 567 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 568
 569 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 570                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 571                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 572
 573 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 574                      $(init-n) $(init-) \
 575                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 576                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 577
 578 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 579 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 580 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 581 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 582 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 583 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 584 libs-y          := $(libs-y1) $(libs-y2)
 585
 586 # Build vmlinux
 587 # ---------------------------------------------------------------------------
 588 # vmlinux is built from the objects selected by $(vmlinux-init) and
 589 # $(vmlinux-main). Most are built-in.o files from top-level directories
 590 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 591 # Ordering when linking is important, and $(vmlinux-init) must be first.
 592 #
 593 # vmlinux
 594 #   ^
 595 #   |
 596 #   +-< $(vmlinux-init)
 597 #   |   +--< init/version.o + more
 598 #   |
 599 #   +--< $(vmlinux-main)
 600 #   |    +--< driver/built-in.o mm/built-in.o + more
 601 #   |
 602 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 603 #
 604 # vmlinux version (uname -v) cannot be updated during normal
 605 # descending-into-subdirs phase since we do not yet know if we need to
 606 # update vmlinux.
 607 # Therefore this step is delayed until just before final link of vmlinux -
 608 # except in the kallsyms case where it is done just before adding the
 609 # symbols to the kernel.
 610 #
 611 # System.map is generated to document addresses of all kernel symbols
 612
 613 vmlinux-init := $(head-y) $(init-y)
 614 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 615 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 616 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 617 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 618
 619 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 620 # May be overridden by arch/$(ARCH)/Makefile
 621 quiet_cmd_vmlinux__ ?= LD      $@
 622       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 623       -T $(vmlinux-lds) $(vmlinux-init)                          \
 624       --start-group $(vmlinux-main) --end-group                  \
 625       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 626
 627 # Generate new vmlinux version
 628 quiet_cmd_vmlinux_version = GEN     .version
 629       cmd_vmlinux_version = set -e;                     \
 630         if [ ! -r .version ]; then                      \
 631           rm -f .version;                               \
 632           echo 1 >.version;                             \
 633         else                                            \
 634           mv .version .old_version;                     \
 635           expr 0$$(cat .old_version) + 1 >.version;     \
 636         fi;                                             \
 637         $(MAKE) $(build)=init
 638
 639 # Generate System.map
 640 quiet_cmd_sysmap = SYSMAP
 641       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 642
 643 # Link of vmlinux
 644 # If CONFIG_KALLSYMS is set .version is already updated
 645 # Generate System.map and verify that the content is consistent
 646 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 647 # First command is ':' to allow us to use + in front of the rule
 648 define rule_vmlinux__
 649         :
 650         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 651
 652         $(call cmd,vmlinux__)
 653         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 654
 655         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 656           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 657         $(cmd_sysmap) $@ System.map;                                         \
 658         if [ $$? -ne 0 ]; then                                               \
 659                 rm -f $@;                                                    \
 660                 /bin/false;                                                  \
 661         fi;
 662         $(verify_kallsyms)
 663 endef
 664
 665
 666 ifdef CONFIG_KALLSYMS
 667 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 668 # It's a three stage process:
 669 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 670 #   empty
 671 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 672 #   the right size - vmlinux version (uname -v) is updated during this step
 673 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 674 #   but due to the added section, some addresses have shifted.
 675 #   From here, we generate a correct .tmp_kallsyms2.o
 676 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 677 # o Verify that the System.map from vmlinux matches the map from
 678 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 679 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 680 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 681 #   temporary bypass to allow the kernel to be built while the
 682 #   maintainers work out what went wrong with kallsyms.
 683
 684 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 685 last_kallsyms := 3
 686 else
 687 last_kallsyms := 2
 688 endif
 689
 690 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 691
 692 define verify_kallsyms
 693         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 694           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 695           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 696         $(Q)cmp -s System.map .tmp_System.map ||                             \
 697                 (echo Inconsistent kallsyms data;                            \
 698                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 699                  rm .tmp_kallsyms* ; /bin/false )
 700 endef
 701
 702 # Update vmlinux version before link
 703 # Use + in front of this rule to silent warning about make -j1
 704 # First command is ':' to allow us to use + in front of this rule
 705 cmd_ksym_ld = $(cmd_vmlinux__)
 706 define rule_ksym_ld
 707         :
 708         +$(call cmd,vmlinux_version)
 709         $(call cmd,vmlinux__)
 710         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 711 endef
 712
 713 # Generate .S file with all kernel symbols
 714 quiet_cmd_kallsyms = KSYM    $@
 715       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 716                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 717
 718 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 719         $(call if_changed_dep,as_o_S)
 720
 721 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 722         $(call cmd,kallsyms)
 723
 724 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 725 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 726         $(call if_changed_rule,ksym_ld)
 727
 728 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 729         $(call if_changed,vmlinux__)
 730
 731 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 732         $(call if_changed,vmlinux__)
 733
 734 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 735 $(KALLSYMS): scripts ;
 736
 737 # Generate some data for debugging strange kallsyms problems
 738 debug_kallsyms: .tmp_map$(last_kallsyms)
 739
 740 .tmp_map%: .tmp_vmlinux% FORCE
 741         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 742
 743 .tmp_map3: .tmp_map2
 744
 745 .tmp_map2: .tmp_map1
 746
 747 endif # ifdef CONFIG_KALLSYMS
 748
 749 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 750 # relevant sections renamed as per the linker script.
 751 quiet_cmd_vmlinux-modpost = LD      $@
 752       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 753          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 754          $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
 755 define rule_vmlinux-modpost
 756         :
 757         +$(call cmd,vmlinux-modpost)
 758         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 759         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 760 endef
 761
 762 # vmlinux image - including updated kernel symbols
 763 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
 764 ifdef CONFIG_HEADERS_CHECK
 765         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 766 endif
 767         $(call vmlinux-modpost)
 768         $(call if_changed_rule,vmlinux__)
 769         $(Q)rm -f .old_version
 770
 771 vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 772         $(call if_changed_rule,vmlinux-modpost)
 773
 774 # The actual objects are generated when descending,
 775 # make sure no implicit rule kicks in
 776 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 777
 778 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 779 # Preset locale variables to speed up the build process. Limit locale
 780 # tweaks to this spot to avoid wrong language settings when running
 781 # make menuconfig etc.
 782 # Error messages still appears in the original language
 783
 784 PHONY += $(vmlinux-dirs)
 785 $(vmlinux-dirs): prepare scripts
 786         $(Q)$(MAKE) $(build)=$@
 787
 788 # Build the kernel release string
 789 #
 790 # The KERNELRELEASE value built here is stored in the file
 791 # include/config/kernel.release, and is used when executing several
 792 # make targets, such as "make install" or "make modules_install."
 793 #
 794 # The eventual kernel release string consists of the following fields,
 795 # shown in a hierarchical format to show how smaller parts are concatenated
 796 # to form the larger and final value, with values coming from places like
 797 # the Makefile, kernel config options, make command line options and/or
 798 # SCM tag information.
 799 #
 800 #       $(KERNELVERSION)
 801 #         $(VERSION)                    eg, 2
 802 #         $(PATCHLEVEL)                 eg, 6
 803 #         $(SUBLEVEL)                   eg, 18
 804 #         $(EXTRAVERSION)               eg, -rc6
 805 #       $(localver-full)
 806 #         $(localver)
 807 #           localversion*               (files without backups, containing '~')
 808 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 809 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 810 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 811 #           $(LOCALVERSION)             (from make command line if provided)
 812 #
 813 #  Note how the final $(localver-auto) string is included *only* if the
 814 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 815 # moment, only git is supported but other SCMs can edit the script
 816 # scripts/setlocalversion and add the appropriate checks as needed.
 817
 818 pattern = ".*/localversion[^~]*"
 819 string  = $(shell cat /dev/null \
 820            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 821
 822 localver = $(subst $(space),, $(string) \
 823                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 824
 825 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 826 # and if the SCM is know a tag from the SCM is appended.
 827 # The appended tag is determined by the SCM used.
 828 #
 829 # Currently, only git is supported.
 830 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 831 # checks as needed.
 832 ifdef CONFIG_LOCALVERSION_AUTO
 833         _localver-auto = $(shell $(CONFIG_SHELL) \
 834                           $(srctree)/scripts/setlocalversion $(srctree))
 835         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 836 endif
 837
 838 localver-full = $(localver)$(localver-auto)
 839
 840 # Store (new) KERNELRELASE string in include/config/kernel.release
 841 kernelrelease = $(KERNELVERSION)$(localver-full)
 842 include/config/kernel.release: include/config/auto.conf FORCE
 843         $(Q)rm -f $@
 844         $(Q)echo $(kernelrelease) > $@
 845
 846
 847 # Things we need to do before we recursively start building the kernel
 848 # or the modules are listed in "prepare".
 849 # A multi level approach is used. prepareN is processed before prepareN-1.
 850 # archprepare is used in arch Makefiles and when processed asm symlink,
 851 # version.h and scripts_basic is processed / created.
 852
 853 # Listed in dependency order
 854 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 855
 856 # prepare3 is used to check if we are building in a separate output directory,
 857 # and if so do:
 858 # 1) Check that make has not been executed in the kernel src $(srctree)
 859 # 2) Create the include2 directory, used for the second asm symlink
 860 prepare3: include/config/kernel.release
 861 ifneq ($(KBUILD_SRC),)
 862         @echo '  Using $(srctree) as source for kernel'
 863         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 864                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 865                 echo "  in the '$(srctree)' directory.";\
 866                 /bin/false; \
 867         fi;
 868         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 869         $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
 870 endif
 871
 872 # prepare2 creates a makefile if using a separate output directory
 873 prepare2: prepare3 outputmakefile
 874
 875 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 876                    include/asm include/config/auto.conf
 877 ifneq ($(KBUILD_MODULES),)
 878         $(Q)mkdir -p $(MODVERDIR)
 879         $(Q)rm -f $(MODVERDIR)/*
 880 endif
 881
 882 archprepare: prepare1 scripts_basic
 883
 884 prepare0: archprepare FORCE
 885         $(Q)$(MAKE) $(build)=.
 886         $(Q)$(MAKE) $(build)=. missing-syscalls
 887
 888 # All the preparing..
 889 prepare: prepare0
 890
 891 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 892 # done in arch/$(ARCH)/kernel/Makefile
 893
 894 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 895
 896 # FIXME: The asm symlink changes when $(ARCH) changes. That's
 897 # hard to detect, but I suppose "make mrproper" is a good idea
 898 # before switching between archs anyway.
 899
 900 include/asm:
 901         @echo '  SYMLINK $@ -> include/asm-$(SRCARCH)'
 902         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 903         @ln -fsn asm-$(SRCARCH) $@
 904
 905 # Generate some files
 906 # ---------------------------------------------------------------------------
 907
 908 # KERNELRELEASE can change from a few different places, meaning version.h
 909 # needs to be updated, so this check is forced on all builds
 910
 911 uts_len := 64
 912 define filechk_utsrelease.h
 913         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 914           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 915           exit 1;                                                         \
 916         fi;                                                               \
 917         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 918 endef
 919
 920 define filechk_version.h
 921         (echo \#define LINUX_VERSION_CODE $(shell                             \
 922         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 923         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 924 endef
 925
 926 include/linux/version.h: $(srctree)/Makefile FORCE
 927         $(call filechk,version.h)
 928
 929 include/linux/utsrelease.h: include/config/kernel.release FORCE
 930         $(call filechk,utsrelease.h)
 931
 932 # ---------------------------------------------------------------------------
 933
 934 PHONY += depend dep
 935 depend dep:
 936         @echo '*** Warning: make $@ is unnecessary now.'
 937
 938 # ---------------------------------------------------------------------------
 939 # Kernel headers
 940 INSTALL_HDR_PATH=$(objtree)/usr
 941 export INSTALL_HDR_PATH
 942
 943 HDRFILTER=generic i386 x86_64
 944 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
 945
 946 PHONY += headers_install_all
 947 headers_install_all: include/linux/version.h scripts_basic FORCE
 948         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
 949         $(Q)for arch in $(HDRARCHES); do \
 950          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
 951          done
 952
 953 PHONY += headers_install
 954 headers_install: include/linux/version.h scripts_basic FORCE
 955         @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
 956           echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
 957           exit 1 ; fi
 958         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
 959         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
 960
 961 PHONY += headers_check_all
 962 headers_check_all: headers_install_all
 963         $(Q)for arch in $(HDRARCHES); do \
 964          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
 965          done
 966
 967 PHONY += headers_check
 968 headers_check: headers_install
 969         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
 970
 971 # ---------------------------------------------------------------------------
 972 # Modules
 973
 974 ifdef CONFIG_MODULES
 975
 976 # By default, build modules as well
 977
 978 all: modules
 979
 980 #       Build modules
 981
 982 PHONY += modules
 983 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 984         @echo '  Building modules, stage 2.';
 985         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 986
 987
 988 # Target to prepare building external modules
 989 PHONY += modules_prepare
 990 modules_prepare: prepare scripts
 991
 992 # Target to install modules
 993 PHONY += modules_install
 994 modules_install: _modinst_ _modinst_post
 995
 996 PHONY += _modinst_
 997 _modinst_:
 998         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 999                 echo "Warning: you may need to install module-init-tools"; \
1000                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1001                 sleep 1; \
1002         fi
1003         @rm -rf $(MODLIB)/kernel
1004         @rm -f $(MODLIB)/source
1005         @mkdir -p $(MODLIB)/kernel
1006         @ln -s $(srctree) $(MODLIB)/source
1007         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1008                 rm -f $(MODLIB)/build ; \
1009                 ln -s $(objtree) $(MODLIB)/build ; \
1010         fi
1011         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1012
1013 # If System.map exists, run depmod.  This deliberately does not have a
1014 # dependency on System.map since that would run the dependency tree on
1015 # vmlinux.  This depmod is only for convenience to give the initial
1016 # boot a modules.dep even before / is mounted read-write.  However the
1017 # boot script depmod is the master version.
1018 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
1019 depmod_opts     :=
1020 else
1021 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
1022 endif
1023 PHONY += _modinst_post
1024 _modinst_post: _modinst_
1025         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
1026
1027 else # CONFIG_MODULES
1028
1029 # Modules not configured
1030 # ---------------------------------------------------------------------------
1031
1032 modules modules_install: FORCE
1033         @echo
1034         @echo "The present kernel configuration has modules disabled."
1035         @echo "Type 'make config' and enable loadable module support."
1036         @echo "Then build a kernel with module support enabled."
1037         @echo
1038         @exit 1
1039
1040 endif # CONFIG_MODULES
1041
1042 ###
1043 # Cleaning is done on three levels.
1044 # make clean     Delete most generated files
1045 #                Leave enough to build external modules
1046 # make mrproper  Delete the current configuration, and all generated files
1047 # make distclean Remove editor backup files, patch leftover files and the like
1048
1049 # Directories & files removed with 'make clean'
1050 CLEAN_DIRS  += $(MODVERDIR)
1051 CLEAN_FILES +=  vmlinux System.map \
1052                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1053
1054 # Directories & files removed with 'make mrproper'
1055 MRPROPER_DIRS  += include/config include2 usr/include
1056 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1057                   include/linux/autoconf.h include/linux/version.h      \
1058                   include/linux/utsrelease.h                            \
1059                   Module.symvers tags TAGS cscope*
1060
1061 # clean - Delete most, but leave enough to build external modules
1062 #
1063 clean: rm-dirs  := $(CLEAN_DIRS)
1064 clean: rm-files := $(CLEAN_FILES)
1065 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1066
1067 PHONY += $(clean-dirs) clean archclean
1068 $(clean-dirs):
1069         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1070
1071 clean: archclean $(clean-dirs)
1072         $(call cmd,rmdirs)
1073         $(call cmd,rmfiles)
1074         @find . $(RCS_FIND_IGNORE) \
1075                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1076                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1077                 -o -name '*.symtypes' \) \
1078                 -type f -print | xargs rm -f
1079
1080 # mrproper - Delete all generated files, including .config
1081 #
1082 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1083 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1084 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1085
1086 PHONY += $(mrproper-dirs) mrproper archmrproper
1087 $(mrproper-dirs):
1088         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1089
1090 mrproper: clean archmrproper $(mrproper-dirs)
1091         $(call cmd,rmdirs)
1092         $(call cmd,rmfiles)
1093
1094 # distclean
1095 #
1096 PHONY += distclean
1097
1098 distclean: mrproper
1099         @find $(srctree) $(RCS_FIND_IGNORE) \
1100                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1101                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1102                 -o -name '.*.rej' -o -size 0 \
1103                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1104                 -type f -print | xargs rm -f
1105
1106
1107 # Packaging of the kernel to various formats
1108 # ---------------------------------------------------------------------------
1109 # rpm target kept for backward compatibility
1110 package-dir     := $(srctree)/scripts/package
1111
1112 %pkg: include/config/kernel.release FORCE
1113         $(Q)$(MAKE) $(build)=$(package-dir) $@
1114 rpm: include/config/kernel.release FORCE
1115         $(Q)$(MAKE) $(build)=$(package-dir) $@
1116
1117
1118 # Brief documentation of the typical targets used
1119 # ---------------------------------------------------------------------------
1120
1121 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1122 boards := $(notdir $(boards))
1123
1124 help:
1125         @echo  'Cleaning targets:'
1126         @echo  '  clean           - Remove most generated files but keep the config and'
1127         @echo  '                    enough build support to build external modules'
1128         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1129         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1130         @echo  ''
1131         @echo  'Configuration targets:'
1132         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1133         @echo  ''
1134         @echo  'Other generic targets:'
1135         @echo  '  all             - Build all targets marked with [*]'
1136         @echo  '* vmlinux         - Build the bare kernel'
1137         @echo  '* modules         - Build all modules'
1138         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1139         @echo  '  dir/            - Build all files in dir and below'
1140         @echo  '  dir/file.[ois]  - Build specified target only'
1141         @echo  '  dir/file.ko     - Build module including final link'
1142         @echo  '  rpm             - Build a kernel as an RPM package'
1143         @echo  '  tags/TAGS       - Generate tags file for editors'
1144         @echo  '  cscope          - Generate cscope index'
1145         @echo  '  kernelrelease   - Output the release version string'
1146         @echo  '  kernelversion   - Output the version stored in Makefile'
1147         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1148          echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1149          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1150          fi
1151         @echo  ''
1152         @echo  'Static analysers'
1153         @echo  '  checkstack      - Generate a list of stack hogs'
1154         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1155         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1156          echo  '  headers_check   - Sanity check on exported headers'; \
1157          fi
1158         @echo  ''
1159         @echo  'Kernel packaging:'
1160         @$(MAKE) $(build)=$(package-dir) help
1161         @echo  ''
1162         @echo  'Documentation targets:'
1163         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1164         @echo  ''
1165         @echo  'Architecture specific targets ($(ARCH)):'
1166         @$(if $(archhelp),$(archhelp),\
1167                 echo '  No architecture specific help defined for $(ARCH)')
1168         @echo  ''
1169         @$(if $(boards), \
1170                 $(foreach b, $(boards), \
1171                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1172                 echo '')
1173
1174         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1175         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1176         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1177         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1178         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1179         @echo  ''
1180         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1181         @echo  'For further info see the ./README file'
1182
1183
1184 # Documentation targets
1185 # ---------------------------------------------------------------------------
1186 %docs: scripts_basic FORCE
1187         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1188
1189 else # KBUILD_EXTMOD
1190
1191 ###
1192 # External module support.
1193 # When building external modules the kernel used as basis is considered
1194 # read-only, and no consistency checks are made and the make
1195 # system is not used on the basis kernel. If updates are required
1196 # in the basis kernel ordinary make commands (without M=...) must
1197 # be used.
1198 #
1199 # The following are the only valid targets when building external
1200 # modules.
1201 # make M=dir clean     Delete all automatically generated files
1202 # make M=dir modules   Make all modules in specified dir
1203 # make M=dir           Same as 'make M=dir modules'
1204 # make M=dir modules_install
1205 #                      Install the modules built in the module directory
1206 #                      Assumes install directory is already created
1207
1208 # We are always building modules
1209 KBUILD_MODULES := 1
1210 PHONY += crmodverdir
1211 crmodverdir:
1212         $(Q)mkdir -p $(MODVERDIR)
1213         $(Q)rm -f $(MODVERDIR)/*
1214
1215 PHONY += $(objtree)/Module.symvers
1216 $(objtree)/Module.symvers:
1217         @test -e $(objtree)/Module.symvers || ( \
1218         echo; \
1219         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1220         echo "           is missing; modules will have no dependencies and modversions."; \
1221         echo )
1222
1223 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1224 PHONY += $(module-dirs) modules
1225 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1226         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1227
1228 modules: $(module-dirs)
1229         @echo '  Building modules, stage 2.';
1230         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1231
1232 PHONY += modules_install
1233 modules_install: _emodinst_ _emodinst_post
1234
1235 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1236 PHONY += _emodinst_
1237 _emodinst_:
1238         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1239         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1240
1241 # Run depmod only is we have System.map and depmod is executable
1242 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1243       cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1244                       $(DEPMOD) -ae -F System.map             \
1245                       $(if $(strip $(INSTALL_MOD_PATH)),      \
1246                       -b $(INSTALL_MOD_PATH) -r)              \
1247                       $(KERNELRELEASE);                       \
1248                    fi
1249
1250 PHONY += _emodinst_post
1251 _emodinst_post: _emodinst_
1252         $(call cmd,depmod)
1253
1254 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1255
1256 PHONY += $(clean-dirs) clean
1257 $(clean-dirs):
1258         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1259
1260 clean:  rm-dirs := $(MODVERDIR)
1261 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1262 clean: $(clean-dirs)
1263         $(call cmd,rmdirs)
1264         $(call cmd,rmfiles)
1265         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1266                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1267                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1268                 -type f -print | xargs rm -f
1269
1270 help:
1271         @echo  '  Building external modules.'
1272         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1273         @echo  ''
1274         @echo  '  modules         - default target, build the module(s)'
1275         @echo  '  modules_install - install the module'
1276         @echo  '  clean           - remove generated files in module directory only'
1277         @echo  ''
1278
1279 # Dummies...
1280 PHONY += prepare scripts
1281 prepare: ;
1282 scripts: ;
1283 endif # KBUILD_EXTMOD
1284
1285 # Generate tags for editors
1286 # ---------------------------------------------------------------------------
1287
1288 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1289 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1290 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1291
1292 ifeq ($(src),$(obj))
1293 __srctree =
1294 else
1295 __srctree = $(srctree)/
1296 endif
1297
1298 ifeq ($(ALLSOURCE_ARCHS),)
1299 ifeq ($(ARCH),um)
1300 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1301 else
1302 ALLINCLUDE_ARCHS := $(SRCARCH)
1303 endif
1304 else
1305 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1306 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1307 endif
1308
1309 # Take care of arch/x86
1310 ifeq ($(ARCH), $(SRCARCH))
1311 ALLSOURCE_ARCHS := $(ARCH)
1312 else
1313 ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
1314 endif
1315
1316 define find-sources
1317         ( for ARCH in $(ALLSOURCE_ARCHS) ; do \
1318                find $(__srctree)arch/$${SRCARCH} $(RCS_FIND_IGNORE) \
1319                     -name $1 -print; \
1320           done ; \
1321           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1322                -name $1 -print; \
1323           find $(__srctree)include $(RCS_FIND_IGNORE) \
1324                \( -name config -o -name 'asm-*' \) -prune \
1325                -o -name $1 -print; \
1326           for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1327                find $(__srctree)include/asm-$${SRCARCH} $(RCS_FIND_IGNORE) \
1328                     -name $1 -print; \
1329           done ; \
1330           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1331                -name $1 -print; \
1332           find $(__srctree) $(RCS_FIND_IGNORE) \
1333                \( -name include -o -name arch \) -prune -o \
1334                -name $1 -print; \
1335           )
1336 endef
1337
1338 define all-sources
1339         $(call find-sources,'*.[chS]')
1340 endef
1341 define all-kconfigs
1342         $(call find-sources,'Kconfig*')
1343 endef
1344 define all-defconfigs
1345         $(call find-sources,'defconfig')
1346 endef
1347
1348 define xtags
1349         if $1 --version 2>&1 | grep -iq exuberant; then \
1350             $(all-sources) | xargs $1 -a \
1351                 -I __initdata,__exitdata,__acquires,__releases \
1352                 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1353                 --extra=+f --c-kinds=+px \
1354                 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1355             $(all-kconfigs) | xargs $1 -a \
1356                 --langdef=kconfig \
1357                 --language-force=kconfig \
1358                 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1359             $(all-defconfigs) | xargs -r $1 -a \
1360                 --langdef=dotconfig \
1361                 --language-force=dotconfig \
1362                 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1363         elif $1 --version 2>&1 | grep -iq emacs; then \
1364             $(all-sources) | xargs $1 -a; \
1365             $(all-kconfigs) | xargs $1 -a \
1366                 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1367             $(all-defconfigs) | xargs -r $1 -a \
1368                 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1369         else \
1370             $(all-sources) | xargs $1 -a; \
1371         fi
1372 endef
1373
1374 quiet_cmd_cscope-file = FILELST cscope.files
1375       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1376
1377 quiet_cmd_cscope = MAKE    cscope.out
1378       cmd_cscope = cscope -b
1379
1380 cscope: FORCE
1381         $(call cmd,cscope-file)
1382         $(call cmd,cscope)
1383
1384 quiet_cmd_TAGS = MAKE   $@
1385 define cmd_TAGS
1386         rm -f $@; \
1387         $(call xtags,etags)
1388 endef
1389
1390 TAGS: FORCE
1391         $(call cmd,TAGS)
1392
1393 quiet_cmd_tags = MAKE   $@
1394 define cmd_tags
1395         rm -f $@; \
1396         $(call xtags,ctags)
1397 endef
1398
1399 tags: FORCE
1400         $(call cmd,tags)
1401
1402
1403 # Scripts to check various things for consistency
1404 # ---------------------------------------------------------------------------
1405
1406 includecheck:
1407         find * $(RCS_FIND_IGNORE) \
1408                 -name '*.[hcS]' -type f -print | sort \
1409                 | xargs $(PERL) -w scripts/checkincludes.pl
1410
1411 versioncheck:
1412         find * $(RCS_FIND_IGNORE) \
1413                 -name '*.[hcS]' -type f -print | sort \
1414                 | xargs $(PERL) -w scripts/checkversion.pl
1415
1416 namespacecheck:
1417         $(PERL) $(srctree)/scripts/namespace.pl
1418
1419 endif #ifeq ($(config-targets),1)
1420 endif #ifeq ($(mixed-targets),1)
1421
1422 PHONY += checkstack kernelrelease kernelversion
1423
1424 # UML needs a little special treatment here.  It wants to use the host
1425 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1426 # else wants $(ARCH), including people doing cross-builds, which means
1427 # that $(SUBARCH) doesn't work here.
1428 ifeq ($(ARCH), um)
1429 CHECKSTACK_ARCH := $(SUBARCH)
1430 else
1431 CHECKSTACK_ARCH := $(ARCH)
1432 endif
1433 checkstack:
1434         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1435         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1436
1437 kernelrelease:
1438         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1439         $(error kernelrelease not valid - run 'make prepare' to update it))
1440 kernelversion:
1441         @echo $(KERNELVERSION)
1442
1443 # Single targets
1444 # ---------------------------------------------------------------------------
1445 # Single targets are compatible with:
1446 # - build whith mixed source and output
1447 # - build with separate output dir 'make O=...'
1448 # - external modules
1449 #
1450 #  target-dir => where to store outputfile
1451 #  build-dir  => directory in kernel source tree to use
1452
1453 ifeq ($(KBUILD_EXTMOD),)
1454         build-dir  = $(patsubst %/,%,$(dir $@))
1455         target-dir = $(dir $@)
1456 else
1457         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1458         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1459         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1460 endif
1461
1462 %.s: %.c prepare scripts FORCE
1463         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1464 %.i: %.c prepare scripts FORCE
1465         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1466 %.o: %.c prepare scripts FORCE
1467         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1468 %.lst: %.c prepare scripts FORCE
1469         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1470 %.s: %.S prepare scripts FORCE
1471         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1472 %.o: %.S prepare scripts FORCE
1473         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1474 %.symtypes: %.c prepare scripts FORCE
1475         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1476
1477 # Modules
1478 / %/: prepare scripts FORCE
1479         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1480         $(build)=$(build-dir)
1481 %.ko: prepare scripts FORCE
1482         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1483         $(build)=$(build-dir) $(@:.ko=.o)
1484         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1485
1486 # FIXME Should go into a make.lib or something
1487 # ===========================================================================
1488
1489 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1490       cmd_rmdirs = rm -rf $(rm-dirs)
1491
1492 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1493       cmd_rmfiles = rm -f $(rm-files)
1494
1495
1496 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1497           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1498           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1499
1500 quiet_cmd_as_o_S = AS      $@
1501 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1502
1503 # read all saved command lines
1504
1505 targets := $(wildcard $(sort $(targets)))
1506 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1507
1508 ifneq ($(cmd_files),)
1509   $(cmd_files): ;       # Do not try to update included dependency files
1510   include $(cmd_files)
1511 endif
1512
1513 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1514 # Usage:
1515 # $(Q)$(MAKE) $(clean)=dir
1516 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1517
1518 endif   # skip-makefile
1519
1520 PHONY += FORCE
1521 FORCE:
1522
1523 # Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1524 Makefile: ;
1525
1526 # Declare the contents of the .PHONY variable as phony.  We keep that
1527 # information in a variable se we can use it in if_changed and friends.
1528 .PHONY: $(PHONY)