Makefile

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