Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 16
   4 EXTRAVERSION =-rc4
   5 NAME=Sliding Snow Leopard
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # Do not print "Entering directory ..."
  14 MAKEFLAGS += --no-print-directory
  15
  16 # We are using a recursive build, so we need to do a little thinking
  17 # to get the ordering right.
  18 #
  19 # Most importantly: sub-Makefiles should only ever modify files in
  20 # their own directory. If in some directory we have a dependency on
  21 # a file in another dir (which doesn't happen often, but it's often
  22 # unavoidable when linking the built-in.o targets which finally
  23 # turn into vmlinux), we will call a sub make in that other dir, and
  24 # after that we are sure that everything which is in that other dir
  25 # is now up to date.
  26 #
  27 # The only cases where we need to modify files which have global
  28 # effects are thus separated out and done before the recursive
  29 # descending is started. They are now explicitly listed as the
  30 # prepare rule.
  31
  32 # To put more focus on warnings, be less verbose as default
  33 # Use 'make V=1' to see the full commands
  34
  35 ifdef V
  36   ifeq ("$(origin V)", "command line")
  37     KBUILD_VERBOSE = $(V)
  38   endif
  39 endif
  40 ifndef KBUILD_VERBOSE
  41   KBUILD_VERBOSE = 0
  42 endif
  43
  44 # Call sparse as part of compilation of C files
  45 # Use 'make C=1' to enable sparse checking
  46
  47 ifdef C
  48   ifeq ("$(origin C)", "command line")
  49     KBUILD_CHECKSRC = $(C)
  50   endif
  51 endif
  52 ifndef KBUILD_CHECKSRC
  53   KBUILD_CHECKSRC = 0
  54 endif
  55
  56 # Use make M=dir to specify directory of external module to build
  57 # Old syntax make ... SUBDIRS=$PWD is still supported
  58 # Setting the environment variable KBUILD_EXTMOD take precedence
  59 ifdef SUBDIRS
  60   KBUILD_EXTMOD ?= $(SUBDIRS)
  61 endif
  62 ifdef M
  63   ifeq ("$(origin M)", "command line")
  64     KBUILD_EXTMOD := $(M)
  65   endif
  66 endif
  67
  68
  69 # kbuild supports saving output files in a separate directory.
  70 # To locate output files in a separate directory two syntaxes are supported.
  71 # In both cases the working directory must be the root of the kernel src.
  72 # 1) O=
  73 # Use "make O=dir/to/store/output/files/"
  74 #
  75 # 2) Set KBUILD_OUTPUT
  76 # Set the environment variable KBUILD_OUTPUT to point to the directory
  77 # where the output files shall be placed.
  78 # export KBUILD_OUTPUT=dir/to/store/output/files/
  79 # make
  80 #
  81 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  82 # variable.
  83
  84
  85 # KBUILD_SRC is set on invocation of make in OBJ directory
  86 # KBUILD_SRC is not intended to be used by the regular user (for now)
  87 ifeq ($(KBUILD_SRC),)
  88
  89 # OK, Make called in directory where kernel src resides
  90 # Do we want to locate output files in a separate directory?
  91 ifdef O
  92   ifeq ("$(origin O)", "command line")
  93     KBUILD_OUTPUT := $(O)
  94   endif
  95 endif
  96
  97 # That's our default target when none is given on the command line
  98 .PHONY: _all
  99 _all:
 100
 101 ifneq ($(KBUILD_OUTPUT),)
 102 # Invoke a second make in the output directory, passing relevant variables
 103 # check that the output directory actually exists
 104 saved-output := $(KBUILD_OUTPUT)
 105 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 106 $(if $(KBUILD_OUTPUT),, \
 107      $(error output directory "$(saved-output)" does not exist))
 108
 109 .PHONY: $(MAKECMDGOALS)
 110
 111 $(filter-out _all,$(MAKECMDGOALS)) _all:
 112         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 113         KBUILD_SRC=$(CURDIR) \
 114         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
 115
 116 # Leave processing to above invocation of make
 117 skip-makefile := 1
 118 endif # ifneq ($(KBUILD_OUTPUT),)
 119 endif # ifeq ($(KBUILD_SRC),)
 120
 121 # We process the rest of the Makefile if this is the final invocation of make
 122 ifeq ($(skip-makefile),)
 123
 124 # If building an external module we do not care about the all: rule
 125 # but instead _all depend on modules
 126 .PHONY: all
 127 ifeq ($(KBUILD_EXTMOD),)
 128 _all: all
 129 else
 130 _all: modules
 131 endif
 132
 133 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 134 TOPDIR          := $(srctree)
 135 # FIXME - TOPDIR is obsolete, use srctree/objtree
 136 objtree         := $(CURDIR)
 137 src             := $(srctree)
 138 obj             := $(objtree)
 139
 140 VPATH           := $(srctree):$(KBUILD_EXTMOD)
 141
 142 export srctree objtree VPATH TOPDIR
 143
 144
 145 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 146 # first, and if a usermode build is happening, the "ARCH=um" on the command
 147 # line overrides the setting of ARCH below.  If a native build is happening,
 148 # then ARCH is assigned, getting whatever value it gets normally, and
 149 # SUBARCH is subsequently ignored.
 150
 151 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 152                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 153                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 154                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
 155
 156 # Cross compiling and selecting different set of gcc/bin-utils
 157 # ---------------------------------------------------------------------------
 158 #
 159 # When performing cross compilation for other architectures ARCH shall be set
 160 # to the target architecture. (See arch/* for the possibilities).
 161 # ARCH can be set during invocation of make:
 162 # make ARCH=ia64
 163 # Another way is to have ARCH set in the environment.
 164 # The default ARCH is the host where make is executed.
 165
 166 # CROSS_COMPILE specify the prefix used for all executables used
 167 # during compilation. Only gcc and related bin-utils executables
 168 # are prefixed with $(CROSS_COMPILE).
 169 # CROSS_COMPILE can be set on the command line
 170 # make CROSS_COMPILE=ia64-linux-
 171 # Alternatively CROSS_COMPILE can be set in the environment.
 172 # Default value for CROSS_COMPILE is not to prefix executables
 173 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 174
 175 ARCH            ?= $(SUBARCH)
 176 CROSS_COMPILE   ?=
 177
 178 # Architecture as present in compile.h
 179 UTS_MACHINE := $(ARCH)
 180
 181 # SHELL used by kbuild
 182 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 183           else if [ -x /bin/bash ]; then echo /bin/bash; \
 184           else echo sh; fi ; fi)
 185
 186 HOSTCC          = gcc
 187 HOSTCXX         = g++
 188 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 189 HOSTCXXFLAGS    = -O2
 190
 191 #       Decide whether to build built-in, modular, or both.
 192 #       Normally, just do built-in.
 193
 194 KBUILD_MODULES :=
 195 KBUILD_BUILTIN := 1
 196
 197 #       If we have only "make modules", don't compile built-in objects.
 198 #       When we're building modules with modversions, we need to consider
 199 #       the built-in objects during the descend as well, in order to
 200 #       make sure the checksums are uptodate before we record them.
 201
 202 ifeq ($(MAKECMDGOALS),modules)
 203   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 204 endif
 205
 206 #       If we have "make <whatever> modules", compile modules
 207 #       in addition to whatever we do anyway.
 208 #       Just "make" or "make all" shall build modules as well
 209
 210 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 211   KBUILD_MODULES := 1
 212 endif
 213
 214 ifeq ($(MAKECMDGOALS),)
 215   KBUILD_MODULES := 1
 216 endif
 217
 218 export KBUILD_MODULES KBUILD_BUILTIN
 219 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 220
 221 # Beautify output
 222 # ---------------------------------------------------------------------------
 223 #
 224 # Normally, we echo the whole command before executing it. By making
 225 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 226 # $(quiet) to choose other forms of output instead, e.g.
 227 #
 228 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 229 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 230 #
 231 # If $(quiet) is empty, the whole command will be printed.
 232 # If it is set to "quiet_", only the short version will be printed.
 233 # If it is set to "silent_", nothing wil be printed at all, since
 234 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 235 #
 236 # A simple variant is to prefix commands with $(Q) - that's useful
 237 # for commands that shall be hidden in non-verbose mode.
 238 #
 239 #       $(Q)ln $@ :<
 240 #
 241 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 242 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 243
 244 ifeq ($(KBUILD_VERBOSE),1)
 245   quiet =
 246   Q =
 247 else
 248   quiet=quiet_
 249   Q = @
 250 endif
 251
 252 # If the user is running make -s (silent mode), suppress echoing of
 253 # commands
 254
 255 ifneq ($(findstring s,$(MAKEFLAGS)),)
 256   quiet=silent_
 257 endif
 258
 259 export quiet Q KBUILD_VERBOSE
 260
 261 ######
 262 # cc support functions to be used (only) in arch/$(ARCH)/Makefile
 263 # See documentation in Documentation/kbuild/makefiles.txt
 264
 265 # as-option
 266 # Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,)
 267
 268 as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \
 269              -xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \
 270              else echo "$(2)"; fi ;)
 271
 272 # cc-option
 273 # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
 274
 275 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 276              > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 277
 278 # cc-option-yn
 279 # Usage: flag := $(call cc-option-yn, -march=winchip-c6)
 280 cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 281                 > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
 282
 283 # cc-option-align
 284 # Prefix align with either -falign or -malign
 285 cc-option-align = $(subst -functions=0,,\
 286         $(call cc-option,-falign-functions=0,-malign-functions=0))
 287
 288 # cc-version
 289 # Usage gcc-ver := $(call cc-version $(CC))
 290 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
 291               $(if $(1), $(1), $(CC)))
 292
 293
 294 # Look for make include files relative to root of kernel src
 295 MAKEFLAGS += --include-dir=$(srctree)
 296
 297 # We need some generic definitions
 298 include  $(srctree)/scripts/Kbuild.include
 299
 300 # For maximum performance (+ possibly random breakage, uncomment
 301 # the following)
 302
 303 #MAKEFLAGS += -rR
 304
 305 # Make variables (CC, etc...)
 306
 307 AS              = $(CROSS_COMPILE)as
 308 LD              = $(CROSS_COMPILE)ld
 309 CC              = $(CROSS_COMPILE)gcc
 310 CPP             = $(CC) -E
 311 AR              = $(CROSS_COMPILE)ar
 312 NM              = $(CROSS_COMPILE)nm
 313 STRIP           = $(CROSS_COMPILE)strip
 314 OBJCOPY         = $(CROSS_COMPILE)objcopy
 315 OBJDUMP         = $(CROSS_COMPILE)objdump
 316 AWK             = awk
 317 GENKSYMS        = scripts/genksyms/genksyms
 318 DEPMOD          = /sbin/depmod
 319 KALLSYMS        = scripts/kallsyms
 320 PERL            = perl
 321 CHECK           = sparse
 322
 323 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 324 MODFLAGS        = -DMODULE
 325 CFLAGS_MODULE   = $(MODFLAGS)
 326 AFLAGS_MODULE   = $(MODFLAGS)
 327 LDFLAGS_MODULE  = -r
 328 CFLAGS_KERNEL   =
 329 AFLAGS_KERNEL   =
 330
 331
 332 # Use LINUXINCLUDE when you must reference the include/ directory.
 333 # Needed to be compatible with the O= option
 334 LINUXINCLUDE    := -Iinclude \
 335                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 336                    -include include/linux/autoconf.h
 337
 338 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 339
 340 CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 341                    -fno-strict-aliasing -fno-common \
 342                    -ffreestanding
 343 AFLAGS          := -D__ASSEMBLY__
 344
 345 # Read KERNELRELEASE from .kernelrelease (if it exists)
 346 KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
 347 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 348
 349 export  VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
 350         ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 351         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 352         HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 353
 354 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 355 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 356 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 357
 358 # When compiling out-of-tree modules, put MODVERDIR in the module
 359 # tree rather than in the kernel tree. The kernel tree might
 360 # even be read-only.
 361 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 362
 363 # Files to ignore in find ... statements
 364
 365 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
 366 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 367
 368 # ===========================================================================
 369 # Rules shared between *config targets and build targets
 370
 371 # Basic helpers built in scripts/
 372 .PHONY: scripts_basic
 373 scripts_basic:
 374         $(Q)$(MAKE) $(build)=scripts/basic
 375
 376 # To avoid any implicit rule to kick in, define an empty command.
 377 scripts/basic/%: scripts_basic ;
 378
 379 .PHONY: outputmakefile
 380 # outputmakefile generate a Makefile to be placed in output directory, if
 381 # using a seperate output directory. This allows convinient use
 382 # of make in output directory
 383 outputmakefile:
 384         $(Q)if test ! $(srctree) -ef $(objtree); then \
 385         $(CONFIG_SHELL) $(srctree)/scripts/mkmakefile              \
 386             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)         \
 387             > $(objtree)/Makefile;                                 \
 388             echo '  GEN    $(objtree)/Makefile';                   \
 389         fi
 390
 391 # To make sure we do not include .config for any of the *config targets
 392 # catch them early, and hand them over to scripts/kconfig/Makefile
 393 # It is allowed to specify more targets when calling make, including
 394 # mixing *config targets and build targets.
 395 # For example 'make oldconfig all'.
 396 # Detect when mixed targets is specified, and make a second invocation
 397 # of make so .config is not included in this case either (for *config).
 398
 399 no-dot-config-targets := clean mrproper distclean \
 400                          cscope TAGS tags help %docs check%
 401
 402 config-targets := 0
 403 mixed-targets  := 0
 404 dot-config     := 1
 405
 406 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 407         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 408                 dot-config := 0
 409         endif
 410 endif
 411
 412 ifeq ($(KBUILD_EXTMOD),)
 413         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 414                 config-targets := 1
 415                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 416                         mixed-targets := 1
 417                 endif
 418         endif
 419 endif
 420
 421 ifeq ($(mixed-targets),1)
 422 # ===========================================================================
 423 # We're called with mixed targets (*config and build targets).
 424 # Handle them one by one.
 425
 426 %:: FORCE
 427         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 428
 429 else
 430 ifeq ($(config-targets),1)
 431 # ===========================================================================
 432 # *config targets only - make sure prerequisites are updated, and descend
 433 # in scripts/kconfig to make the *config target
 434
 435 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 436 # KBUILD_DEFCONFIG may point out an alternative default configuration
 437 # used for 'make defconfig'
 438 include $(srctree)/arch/$(ARCH)/Makefile
 439 export KBUILD_DEFCONFIG
 440
 441 config %config: scripts_basic outputmakefile FORCE
 442         $(Q)mkdir -p include/linux
 443         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 444         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
 445
 446 else
 447 # ===========================================================================
 448 # Build targets only - this includes vmlinux, arch specific targets, clean
 449 # targets and others. In general all targets except *config targets.
 450
 451 ifeq ($(KBUILD_EXTMOD),)
 452 # Additional helpers built in scripts/
 453 # Carefully list dependencies so we do not try to build scripts twice
 454 # in parrallel
 455 .PHONY: scripts
 456 scripts: scripts_basic include/config/MARKER
 457         $(Q)$(MAKE) $(build)=$(@)
 458
 459 scripts_basic: include/linux/autoconf.h
 460
 461 # Objects we will link into vmlinux / subdirs we need to visit
 462 init-y          := init/
 463 drivers-y       := drivers/ sound/
 464 net-y           := net/
 465 libs-y          := lib/
 466 core-y          := usr/
 467 endif # KBUILD_EXTMOD
 468
 469 ifeq ($(dot-config),1)
 470 # In this section, we need .config
 471
 472 # Read in dependencies to all Kconfig* files, make sure to run
 473 # oldconfig if changes are detected.
 474 -include .kconfig.d
 475
 476 include .config
 477
 478 # If .config needs to be updated, it will be done via the dependency
 479 # that autoconf has on .config.
 480 # To avoid any implicit rule to kick in, define an empty command
 481 .config .kconfig.d: ;
 482
 483 # If .config is newer than include/linux/autoconf.h, someone tinkered
 484 # with it and forgot to run make oldconfig.
 485 # If kconfig.d is missing then we are probarly in a cleaned tree so
 486 # we execute the config step to be sure to catch updated Kconfig files
 487 include/linux/autoconf.h: .kconfig.d .config
 488         $(Q)mkdir -p include/linux
 489         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 490 else
 491 # Dummy target needed, because used as prerequisite
 492 include/linux/autoconf.h: ;
 493 endif
 494
 495 # The all: target is the default when no target is given on the
 496 # command line.
 497 # This allow a user to issue only 'make' to build a kernel including modules
 498 # Defaults vmlinux but it is usually overriden in the arch makefile
 499 all: vmlinux
 500
 501 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 502 CFLAGS          += -Os
 503 else
 504 CFLAGS          += -O2
 505 endif
 506
 507 #Add align options if CONFIG_CC_* is not equal to 0
 508 add-align = $(if $(filter-out 0,$($(1))),$(cc-option-align)$(2)=$($(1)))
 509 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_FUNCTIONS,-functions)
 510 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LABELS,-labels)
 511 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
 512 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
 513
 514 ifdef CONFIG_FRAME_POINTER
 515 CFLAGS          += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 516 else
 517 CFLAGS          += -fomit-frame-pointer
 518 endif
 519
 520 ifdef CONFIG_DEBUG_INFO
 521 CFLAGS          += -g
 522 endif
 523
 524 include $(srctree)/arch/$(ARCH)/Makefile
 525
 526 # arch Makefile may override CC so keep this after arch Makefile is included
 527 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 528 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 529
 530 # warn about C99 declaration after statement
 531 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 532
 533 # disable pointer signedness warnings in gcc 4.0
 534 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 535
 536 # Default kernel image to build when no specific target is given.
 537 # KBUILD_IMAGE may be overruled on the commandline or
 538 # set in the environment
 539 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 540 # this default value
 541 export KBUILD_IMAGE ?= vmlinux
 542
 543 #
 544 # INSTALL_PATH specifies where to place the updated kernel and system map
 545 # images. Default is /boot, but you can set it to other values
 546 export  INSTALL_PATH ?= /boot
 547
 548 #
 549 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 550 # relocations required by build roots.  This is not defined in the
 551 # makefile but the arguement can be passed to make if needed.
 552 #
 553
 554 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 555 export MODLIB
 556
 557
 558 ifeq ($(KBUILD_EXTMOD),)
 559 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 560
 561 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 562                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 563                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 564
 565 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 566                      $(init-n) $(init-) \
 567                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 568                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 569
 570 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 571 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 572 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 573 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 574 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 575 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 576 libs-y          := $(libs-y1) $(libs-y2)
 577
 578 # Build vmlinux
 579 # ---------------------------------------------------------------------------
 580 # vmlinux is build from the objects selected by $(vmlinux-init) and
 581 # $(vmlinux-main). Most are built-in.o files from top-level directories
 582 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 583 # Ordering when linking is important, and $(vmlinux-init) must be first.
 584 #
 585 # vmlinux
 586 #   ^
 587 #   |
 588 #   +-< $(vmlinux-init)
 589 #   |   +--< init/version.o + more
 590 #   |
 591 #   +--< $(vmlinux-main)
 592 #   |    +--< driver/built-in.o mm/built-in.o + more
 593 #   |
 594 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 595 #
 596 # vmlinux version (uname -v) cannot be updated during normal
 597 # descending-into-subdirs phase since we do not yet know if we need to
 598 # update vmlinux.
 599 # Therefore this step is delayed until just before final link of vmlinux -
 600 # except in the kallsyms case where it is done just before adding the
 601 # symbols to the kernel.
 602 #
 603 # System.map is generated to document addresses of all kernel symbols
 604
 605 vmlinux-init := $(head-y) $(init-y)
 606 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 607 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 608 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 609
 610 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 611 # May be overridden by arch/$(ARCH)/Makefile
 612 quiet_cmd_vmlinux__ ?= LD      $@
 613       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 614       -T $(vmlinux-lds) $(vmlinux-init)                          \
 615       --start-group $(vmlinux-main) --end-group                  \
 616       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 617
 618 # Generate new vmlinux version
 619 quiet_cmd_vmlinux_version = GEN     .version
 620       cmd_vmlinux_version = set -e;                     \
 621         if [ ! -r .version ]; then                      \
 622           rm -f .version;                               \
 623           echo 1 >.version;                             \
 624         else                                            \
 625           mv .version .old_version;                     \
 626           expr 0$$(cat .old_version) + 1 >.version;     \
 627         fi;                                             \
 628         $(MAKE) $(build)=init
 629
 630 # Generate System.map
 631 quiet_cmd_sysmap = SYSMAP
 632       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 633
 634 # Link of vmlinux
 635 # If CONFIG_KALLSYMS is set .version is already updated
 636 # Generate System.map and verify that the content is consistent
 637 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 638 # First command is ':' to allow us to use + in front of the rule
 639 define rule_vmlinux__
 640         :
 641         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 642
 643         $(call cmd,vmlinux__)
 644         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 645
 646         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 647           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 648         $(cmd_sysmap) $@ System.map;                    \
 649         if [ $$? -ne 0 ]; then                          \
 650                 rm -f $@;                               \
 651                 /bin/false;                             \
 652         fi;
 653         $(verify_kallsyms)
 654 endef
 655
 656
 657 ifdef CONFIG_KALLSYMS
 658 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 659 # It's a three stage process:
 660 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 661 #   empty
 662 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 663 #   the right size - vmlinux version (uname -v) is updated during this step
 664 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 665 #   but due to the added section, some addresses have shifted.
 666 #   From here, we generate a correct .tmp_kallsyms2.o
 667 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 668 # o Verify that the System.map from vmlinux matches the map from
 669 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 670 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 671 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 672 #   temporary bypass to allow the kernel to be built while the
 673 #   maintainers work out what went wrong with kallsyms.
 674
 675 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 676 last_kallsyms := 3
 677 else
 678 last_kallsyms := 2
 679 endif
 680
 681 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 682
 683 define verify_kallsyms
 684         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 685           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 686           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 687         $(Q)cmp -s System.map .tmp_System.map ||              \
 688                 (echo Inconsistent kallsyms data;             \
 689                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 690                  rm .tmp_kallsyms* ; /bin/false )
 691 endef
 692
 693 # Update vmlinux version before link
 694 # Use + in front of this rule to silent warning about make -j1
 695 # First command is ':' to allow us to use + in front of this rule
 696 cmd_ksym_ld = $(cmd_vmlinux__)
 697 define rule_ksym_ld
 698         :
 699         +$(call cmd,vmlinux_version)
 700         $(call cmd,vmlinux__)
 701         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 702 endef
 703
 704 # Generate .S file with all kernel symbols
 705 quiet_cmd_kallsyms = KSYM    $@
 706       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 707                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 708
 709 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 710         $(call if_changed_dep,as_o_S)
 711
 712 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 713         $(call cmd,kallsyms)
 714
 715 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 716 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 717         $(call if_changed_rule,ksym_ld)
 718
 719 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 720         $(call if_changed,vmlinux__)
 721
 722 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 723         $(call if_changed,vmlinux__)
 724
 725 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 726 $(KALLSYMS): scripts ;
 727
 728 # Generate some data for debugging strange kallsyms problems
 729 debug_kallsyms: .tmp_map$(last_kallsyms)
 730
 731 .tmp_map%: .tmp_vmlinux% FORCE
 732         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 733
 734 .tmp_map3: .tmp_map2
 735
 736 .tmp_map2: .tmp_map1
 737
 738 endif # ifdef CONFIG_KALLSYMS
 739
 740 # vmlinux image - including updated kernel symbols
 741 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 742         $(call if_changed_rule,vmlinux__)
 743         $(Q)rm -f .old_version
 744
 745 # The actual objects are generated when descending,
 746 # make sure no implicit rule kicks in
 747 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 748
 749 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 750 # Preset locale variables to speed up the build process. Limit locale
 751 # tweaks to this spot to avoid wrong language settings when running
 752 # make menuconfig etc.
 753 # Error messages still appears in the original language
 754
 755 .PHONY: $(vmlinux-dirs)
 756 $(vmlinux-dirs): prepare scripts
 757         $(Q)$(MAKE) $(build)=$@
 758
 759 # Build the kernel release string
 760 # The KERNELRELEASE is stored in a file named .kernelrelease
 761 # to be used when executing for example make install or make modules_install
 762 #
 763 # Take the contents of any files called localversion* and the config
 764 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
 765 # LOCALVERSION from the command line override all of this
 766
 767 nullstring :=
 768 space      := $(nullstring) # end of line
 769
 770 ___localver = $(objtree)/localversion* $(srctree)/localversion*
 771 __localver  = $(sort $(wildcard $(___localver)))
 772 # skip backup files (containing '~')
 773 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
 774
 775 localver = $(subst $(space),, \
 776            $(shell cat /dev/null $(_localver)) \
 777            $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 778
 779 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 780 # and if the SCM is know a tag from the SCM is appended.
 781 # The appended tag is determinded by the SCM used.
 782 #
 783 # Currently, only git is supported.
 784 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 785 # checks as needed.
 786 ifdef CONFIG_LOCALVERSION_AUTO
 787         _localver-auto = $(shell $(CONFIG_SHELL) \
 788                           $(srctree)/scripts/setlocalversion $(srctree))
 789         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 790 endif
 791
 792 localver-full = $(localver)$(localver-auto)
 793
 794 # Store (new) KERNELRELASE string in .kernelrelease
 795 kernelrelease = $(KERNELVERSION)$(localver-full)
 796 .kernelrelease: FORCE
 797         $(Q)rm -f $@
 798         $(Q)echo $(kernelrelease) > $@
 799
 800
 801 # Things we need to do before we recursively start building the kernel
 802 # or the modules are listed in "prepare".
 803 # A multi level approach is used. prepareN is processed before prepareN-1.
 804 # archprepare is used in arch Makefiles and when processed asm symlink,
 805 # version.h and scripts_basic is processed / created.
 806
 807 # Listed in dependency order
 808 .PHONY: prepare archprepare prepare0 prepare1 prepare2 prepare3
 809
 810 # prepare-all is deprecated, use prepare as valid replacement
 811 .PHONY: prepare-all
 812
 813 # prepare3 is used to check if we are building in a separate output directory,
 814 # and if so do:
 815 # 1) Check that make has not been executed in the kernel src $(srctree)
 816 # 2) Create the include2 directory, used for the second asm symlink
 817 prepare3: .kernelrelease
 818 ifneq ($(KBUILD_SRC),)
 819         @echo '  Using $(srctree) as source for kernel'
 820         $(Q)if [ -f $(srctree)/.config ]; then \
 821                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 822                 echo "  in the '$(srctree)' directory.";\
 823                 /bin/false; \
 824         fi;
 825         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 826         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 827 endif
 828
 829 # prepare2 creates a makefile if using a separate output directory
 830 prepare2: prepare3 outputmakefile
 831
 832 prepare1: prepare2 include/linux/version.h include/asm \
 833                    include/config/MARKER
 834 ifneq ($(KBUILD_MODULES),)
 835         $(Q)rm -rf $(MODVERDIR)
 836         $(Q)mkdir -p $(MODVERDIR)
 837 endif
 838
 839 archprepare: prepare1 scripts_basic
 840
 841 prepare0: archprepare FORCE
 842         $(Q)$(MAKE) $(build)=.
 843
 844 # All the preparing..
 845 prepare prepare-all: prepare0
 846
 847 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 848 #       done in arch/$(ARCH)/kernel/Makefile
 849
 850 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 851
 852 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 853 #       hard to detect, but I suppose "make mrproper" is a good idea
 854 #       before switching between archs anyway.
 855
 856 include/asm:
 857         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 858         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 859         @ln -fsn asm-$(ARCH) $@
 860
 861 #       Split autoconf.h into include/linux/config/*
 862
 863 include/config/MARKER: scripts/basic/split-include include/linux/autoconf.h
 864         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 865         @scripts/basic/split-include include/linux/autoconf.h include/config
 866         @touch $@
 867
 868 # Generate some files
 869 # ---------------------------------------------------------------------------
 870
 871 # KERNELRELEASE can change from a few different places, meaning version.h
 872 # needs to be updated, so this check is forced on all builds
 873
 874 uts_len := 64
 875
 876 define filechk_version.h
 877         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 878           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 879           exit 1; \
 880         fi; \
 881         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 882           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 883          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 884         )
 885 endef
 886
 887 include/linux/version.h: $(srctree)/Makefile .config FORCE
 888         $(call filechk,version.h)
 889
 890 # ---------------------------------------------------------------------------
 891
 892 .PHONY: depend dep
 893 depend dep:
 894         @echo '*** Warning: make $@ is unnecessary now.'
 895
 896 # ---------------------------------------------------------------------------
 897 # Modules
 898
 899 ifdef CONFIG_MODULES
 900
 901 #       By default, build modules as well
 902
 903 all: modules
 904
 905 #       Build modules
 906
 907 .PHONY: modules
 908 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 909         @echo '  Building modules, stage 2.';
 910         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 911
 912
 913 # Target to prepare building external modules
 914 .PHONY: modules_prepare
 915 modules_prepare: prepare scripts
 916
 917 # Target to install modules
 918 .PHONY: modules_install
 919 modules_install: _modinst_ _modinst_post
 920
 921 .PHONY: _modinst_
 922 _modinst_:
 923         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 924                 echo "Warning: you may need to install module-init-tools"; \
 925                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 926                 sleep 1; \
 927         fi
 928         @rm -rf $(MODLIB)/kernel
 929         @rm -f $(MODLIB)/source
 930         @mkdir -p $(MODLIB)/kernel
 931         @ln -s $(srctree) $(MODLIB)/source
 932         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 933                 rm -f $(MODLIB)/build ; \
 934                 ln -s $(objtree) $(MODLIB)/build ; \
 935         fi
 936         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 937
 938 # If System.map exists, run depmod.  This deliberately does not have a
 939 # dependency on System.map since that would run the dependency tree on
 940 # vmlinux.  This depmod is only for convenience to give the initial
 941 # boot a modules.dep even before / is mounted read-write.  However the
 942 # boot script depmod is the master version.
 943 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 944 depmod_opts     :=
 945 else
 946 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 947 endif
 948 .PHONY: _modinst_post
 949 _modinst_post: _modinst_
 950         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 951
 952 else # CONFIG_MODULES
 953
 954 # Modules not configured
 955 # ---------------------------------------------------------------------------
 956
 957 modules modules_install: FORCE
 958         @echo
 959         @echo "The present kernel configuration has modules disabled."
 960         @echo "Type 'make config' and enable loadable module support."
 961         @echo "Then build a kernel with module support enabled."
 962         @echo
 963         @exit 1
 964
 965 endif # CONFIG_MODULES
 966
 967 ###
 968 # Cleaning is done on three levels.
 969 # make clean     Delete most generated files
 970 #                Leave enough to build external modules
 971 # make mrproper  Delete the current configuration, and all generated files
 972 # make distclean Remove editor backup files, patch leftover files and the like
 973
 974 # Directories & files removed with 'make clean'
 975 CLEAN_DIRS  += $(MODVERDIR)
 976 CLEAN_FILES +=  vmlinux System.map \
 977                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 978
 979 # Directories & files removed with 'make mrproper'
 980 MRPROPER_DIRS  += include/config include2
 981 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
 982                   include/linux/autoconf.h include/linux/version.h \
 983                   .kernelrelease Module.symvers tags TAGS cscope*
 984
 985 # clean - Delete most, but leave enough to build external modules
 986 #
 987 clean: rm-dirs  := $(CLEAN_DIRS)
 988 clean: rm-files := $(CLEAN_FILES)
 989 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
 990
 991 .PHONY: $(clean-dirs) clean archclean
 992 $(clean-dirs):
 993         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 994
 995 clean: archclean $(clean-dirs)
 996         $(call cmd,rmdirs)
 997         $(call cmd,rmfiles)
 998         @find . $(RCS_FIND_IGNORE) \
 999                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1000                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1001                 -type f -print | xargs rm -f
1002
1003 # mrproper - Delete all generated files, including .config
1004 #
1005 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1006 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1007 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1008
1009 .PHONY: $(mrproper-dirs) mrproper archmrproper
1010 $(mrproper-dirs):
1011         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1012
1013 mrproper: clean archmrproper $(mrproper-dirs)
1014         $(call cmd,rmdirs)
1015         $(call cmd,rmfiles)
1016
1017 # distclean
1018 #
1019 .PHONY: distclean
1020
1021 distclean: mrproper
1022         @find $(srctree) $(RCS_FIND_IGNORE) \
1023                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1024                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1025                 -o -name '.*.rej' -o -size 0 \
1026                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1027                 -type f -print | xargs rm -f
1028
1029
1030 # Packaging of the kernel to various formats
1031 # ---------------------------------------------------------------------------
1032 # rpm target kept for backward compatibility
1033 package-dir     := $(srctree)/scripts/package
1034
1035 .PHONY: %-pkg rpm
1036
1037 %pkg: FORCE
1038         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1039 rpm: FORCE
1040         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1041
1042
1043 # Brief documentation of the typical targets used
1044 # ---------------------------------------------------------------------------
1045
1046 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1047 boards := $(notdir $(boards))
1048
1049 help:
1050         @echo  'Cleaning targets:'
1051         @echo  '  clean           - remove most generated files but keep the config'
1052         @echo  '  mrproper        - remove all generated files + config + various backup files'
1053         @echo  ''
1054         @echo  'Configuration targets:'
1055         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1056         @echo  ''
1057         @echo  'Other generic targets:'
1058         @echo  '  all             - Build all targets marked with [*]'
1059         @echo  '* vmlinux         - Build the bare kernel'
1060         @echo  '* modules         - Build all modules'
1061         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1062         @echo  '  dir/            - Build all files in dir and below'
1063         @echo  '  dir/file.[ois]  - Build specified target only'
1064         @echo  '  dir/file.ko     - Build module including final link'
1065         @echo  '  rpm             - Build a kernel as an RPM package'
1066         @echo  '  tags/TAGS       - Generate tags file for editors'
1067         @echo  '  cscope          - Generate cscope index'
1068         @echo  '  kernelrelease   - Output the release version string'
1069         @echo  '  kernelversion   - Output the version stored in Makefile'
1070         @echo  ''
1071         @echo  'Static analysers'
1072         @echo  '  buildcheck      - List dangling references to vmlinux discarded sections'
1073         @echo  '                    and init sections from non-init sections'
1074         @echo  '  checkstack      - Generate a list of stack hogs'
1075         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1076         @echo  ''
1077         @echo  'Kernel packaging:'
1078         @$(MAKE) -f $(package-dir)/Makefile help
1079         @echo  ''
1080         @echo  'Documentation targets:'
1081         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1082         @echo  ''
1083         @echo  'Architecture specific targets ($(ARCH)):'
1084         @$(if $(archhelp),$(archhelp),\
1085                 echo '  No architecture specific help defined for $(ARCH)')
1086         @echo  ''
1087         @$(if $(boards), \
1088                 $(foreach b, $(boards), \
1089                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1090                 echo '')
1091
1092         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1093         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1094         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1095         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1096         @echo  ''
1097         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1098         @echo  'For further info see the ./README file'
1099
1100
1101 # Documentation targets
1102 # ---------------------------------------------------------------------------
1103 %docs: scripts_basic FORCE
1104         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1105
1106 else # KBUILD_EXTMOD
1107
1108 ###
1109 # External module support.
1110 # When building external modules the kernel used as basis is considered
1111 # read-only, and no consistency checks are made and the make
1112 # system is not used on the basis kernel. If updates are required
1113 # in the basis kernel ordinary make commands (without M=...) must
1114 # be used.
1115 #
1116 # The following are the only valid targets when building external
1117 # modules.
1118 # make M=dir clean     Delete all automatically generated files
1119 # make M=dir modules   Make all modules in specified dir
1120 # make M=dir           Same as 'make M=dir modules'
1121 # make M=dir modules_install
1122 #                      Install the modules build in the module directory
1123 #                      Assumes install directory is already created
1124
1125 # We are always building modules
1126 KBUILD_MODULES := 1
1127 .PHONY: crmodverdir
1128 crmodverdir:
1129         $(Q)rm -rf $(MODVERDIR)
1130         $(Q)mkdir -p $(MODVERDIR)
1131
1132 .PHONY: $(objtree)/Module.symvers
1133 $(objtree)/Module.symvers:
1134         @test -e $(objtree)/Module.symvers || ( \
1135         echo; \
1136         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1137         echo "           is missing; modules will have no dependencies and modversions."; \
1138         echo )
1139
1140 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1141 .PHONY: $(module-dirs) modules
1142 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1143         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1144
1145 modules: $(module-dirs)
1146         @echo '  Building modules, stage 2.';
1147         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1148
1149 .PHONY: modules_install
1150 modules_install: _emodinst_ _emodinst_post
1151
1152 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1153 .PHONY: _emodinst_
1154 _emodinst_:
1155         $(Q)rm -rf $(MODLIB)/$(install-dir)
1156         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1157         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1158
1159 # Run depmod only is we have System.map and depmod is executable
1160 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1161       cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1162                       $(DEPMOD) -ae -F System.map             \
1163                       $(if $(strip $(INSTALL_MOD_PATH)),      \
1164                       -b $(INSTALL_MOD_PATH) -r)              \
1165                       $(KERNELRELEASE);                       \
1166                    fi
1167
1168 .PHONY: _emodinst_post
1169 _emodinst_post: _emodinst_
1170         $(call cmd,depmod)
1171
1172 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1173
1174 .PHONY: $(clean-dirs) clean
1175 $(clean-dirs):
1176         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1177
1178 clean:  rm-dirs := $(MODVERDIR)
1179 clean: $(clean-dirs)
1180         $(call cmd,rmdirs)
1181         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1182                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1183                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1184                 -type f -print | xargs rm -f
1185
1186 help:
1187         @echo  '  Building external modules.'
1188         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1189         @echo  ''
1190         @echo  '  modules         - default target, build the module(s)'
1191         @echo  '  modules_install - install the module'
1192         @echo  '  clean           - remove generated files in module directory only'
1193         @echo  ''
1194
1195 # Dummies...
1196 .PHONY: prepare scripts
1197 prepare: ;
1198 scripts: ;
1199 endif # KBUILD_EXTMOD
1200
1201 # Generate tags for editors
1202 # ---------------------------------------------------------------------------
1203
1204 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1205 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1206 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1207
1208 ifeq ($(src),$(obj))
1209 __srctree =
1210 else
1211 __srctree = $(srctree)/
1212 endif
1213
1214 ifeq ($(ALLSOURCE_ARCHS),)
1215 ifeq ($(ARCH),um)
1216 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1217 else
1218 ALLINCLUDE_ARCHS := $(ARCH)
1219 endif
1220 else
1221 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1222 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1223 endif
1224
1225 ALLSOURCE_ARCHS := $(ARCH)
1226
1227 define all-sources
1228         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1229                \( -name include -o -name arch \) -prune -o \
1230                -name '*.[chS]' -print; \
1231           for ARCH in $(ALLSOURCE_ARCHS) ; do \
1232                find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1233                     -name '*.[chS]' -print; \
1234           done ; \
1235           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1236                -name '*.[chS]' -print; \
1237           find $(__srctree)include $(RCS_FIND_IGNORE) \
1238                \( -name config -o -name 'asm-*' \) -prune \
1239                -o -name '*.[chS]' -print; \
1240           for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1241                find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1242                     -name '*.[chS]' -print; \
1243           done ; \
1244           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1245                -name '*.[chS]' -print )
1246 endef
1247
1248 quiet_cmd_cscope-file = FILELST cscope.files
1249       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1250
1251 quiet_cmd_cscope = MAKE    cscope.out
1252       cmd_cscope = cscope -b
1253
1254 cscope: FORCE
1255         $(call cmd,cscope-file)
1256         $(call cmd,cscope)
1257
1258 quiet_cmd_TAGS = MAKE   $@
1259 define cmd_TAGS
1260         rm -f $@; \
1261         ETAGSF=`etags --version | grep -i exuberant >/dev/null &&     \
1262                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1263                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1264                       --extra=+f --c-kinds=+px"`;                     \
1265                 $(all-sources) | xargs etags $$ETAGSF -a
1266 endef
1267
1268 TAGS: FORCE
1269         $(call cmd,TAGS)
1270
1271
1272 quiet_cmd_tags = MAKE   $@
1273 define cmd_tags
1274         rm -f $@; \
1275         CTAGSF=`ctags --version | grep -i exuberant >/dev/null &&     \
1276                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1277                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1278                       --extra=+f --c-kinds=+px"`;                     \
1279                 $(all-sources) | xargs ctags $$CTAGSF -a
1280 endef
1281
1282 tags: FORCE
1283         $(call cmd,tags)
1284
1285
1286 # Scripts to check various things for consistency
1287 # ---------------------------------------------------------------------------
1288
1289 includecheck:
1290         find * $(RCS_FIND_IGNORE) \
1291                 -name '*.[hcS]' -type f -print | sort \
1292                 | xargs $(PERL) -w scripts/checkincludes.pl
1293
1294 versioncheck:
1295         find * $(RCS_FIND_IGNORE) \
1296                 -name '*.[hcS]' -type f -print | sort \
1297                 | xargs $(PERL) -w scripts/checkversion.pl
1298
1299 buildcheck:
1300         $(PERL) $(srctree)/scripts/reference_discarded.pl
1301         $(PERL) $(srctree)/scripts/reference_init.pl
1302
1303 namespacecheck:
1304         $(PERL) $(srctree)/scripts/namespace.pl
1305
1306 endif #ifeq ($(config-targets),1)
1307 endif #ifeq ($(mixed-targets),1)
1308
1309 .PHONY: checkstack
1310 checkstack:
1311         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1312         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1313
1314 kernelrelease:
1315         $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1316         $(error kernelrelease not valid - run 'make *config' to update it))
1317 kernelversion:
1318         @echo $(KERNELVERSION)
1319
1320 # Single targets
1321 # ---------------------------------------------------------------------------
1322 # The directory part is taken from first prerequisite, so this
1323 # works even with external modules
1324 %.s: %.c scripts FORCE
1325         $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1326 %.i: %.c scripts FORCE
1327         $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1328 %.o: %.c scripts FORCE
1329         $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1330 %.lst: %.c scripts FORCE
1331         $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1332 %.s: %.S scripts FORCE
1333         $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1334 %.o: %.S scripts FORCE
1335         $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
1336
1337 # For external modules we shall include any directory of the target,
1338 # but usual case there is no directory part.
1339 # make M=`pwd` module.o     => $(dir $@)=./
1340 # make M=`pwd` foo/module.o => $(dir $@)=foo/
1341 # make M=`pwd` /            => $(dir $@)=/
1342
1343 ifeq ($(KBUILD_EXTMOD),)
1344         target-dir = $(@D)
1345 else
1346         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1347         target-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1348 endif
1349
1350 / %/:      scripts prepare FORCE
1351         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1352         $(build)=$(target-dir)
1353 %.ko: scripts FORCE
1354         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1355         $(build)=$(target-dir) $(@:.ko=.o)
1356         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1357
1358 # FIXME Should go into a make.lib or something
1359 # ===========================================================================
1360
1361 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1362       cmd_rmdirs = rm -rf $(rm-dirs)
1363
1364 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1365       cmd_rmfiles = rm -f $(rm-files)
1366
1367
1368 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1369           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1370           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1371
1372 quiet_cmd_as_o_S = AS      $@
1373 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1374
1375 # read all saved command lines
1376
1377 targets := $(wildcard $(sort $(targets)))
1378 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1379
1380 ifneq ($(cmd_files),)
1381   $(cmd_files): ;       # Do not try to update included dependency files
1382   include $(cmd_files)
1383 endif
1384
1385 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1386 # Usage:
1387 # $(Q)$(MAKE) $(clean)=dir
1388 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1389
1390 endif   # skip-makefile
1391
1392 FORCE: