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 145 # FIXME - TOPDIR is obsolete, use srctree/objtree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