Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 12
   4 EXTRAVERSION =-rc2
   5 NAME=Woozy Numbat
   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)         KBUILD_VERBOSE=$(KBUILD_VERBOSE)   \
 114         KBUILD_CHECK=$(KBUILD_CHECK) KBUILD_EXTMOD="$(KBUILD_EXTMOD)"   \
 115         -f $(CURDIR)/Makefile $@
 116
 117 # Leave processing to above invocation of make
 118 skip-makefile := 1
 119 endif # ifneq ($(KBUILD_OUTPUT),)
 120 endif # ifeq ($(KBUILD_SRC),)
 121
 122 # We process the rest of the Makefile if this is the final invocation of make
 123 ifeq ($(skip-makefile),)
 124
 125 # If building an external module we do not care about the all: rule
 126 # but instead _all depend on modules
 127 .PHONY: all
 128 ifeq ($(KBUILD_EXTMOD),)
 129 _all: all
 130 else
 131 _all: modules
 132 endif
 133
 134 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 135 TOPDIR          := $(srctree)
 136 # FIXME - TOPDIR is obsolete, use srctree/objtree
 137 objtree         := $(CURDIR)
 138 src             := $(srctree)
 139 obj             := $(objtree)
 140
 141 VPATH           := $(srctree)
 142
 143 export srctree objtree VPATH TOPDIR
 144
 145 nullstring :=
 146 space      := $(nullstring) # end of line
 147
 148 # Take the contents of any files called localversion* and the config
 149 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. Be
 150 # careful not to include files twice if building in the source
 151 # directory. LOCALVERSION from the command line override all of this
 152
 153 localver := $(objtree)/localversion* $(srctree)/localversion*
 154 localver := $(sort $(wildcard $(localver)))
 155 # skip backup files (containing '~')
 156 localver := $(foreach f, $(localver), $(if $(findstring ~, $(f)),,$(f)))
 157
 158 LOCALVERSION = $(subst $(space),, \
 159                $(shell cat /dev/null $(localver)) \
 160                $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 161
 162 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)
 163
 164 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 165 # first, and if a usermode build is happening, the "ARCH=um" on the command
 166 # line overrides the setting of ARCH below.  If a native build is happening,
 167 # then ARCH is assigned, getting whatever value it gets normally, and
 168 # SUBARCH is subsequently ignored.
 169
 170 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 171                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 172                                   -e s/s390x/s390/ -e s/parisc64/parisc/ )
 173
 174 # Cross compiling and selecting different set of gcc/bin-utils
 175 # ---------------------------------------------------------------------------
 176 #
 177 # When performing cross compilation for other architectures ARCH shall be set
 178 # to the target architecture. (See arch/* for the possibilities).
 179 # ARCH can be set during invocation of make:
 180 # make ARCH=ia64
 181 # Another way is to have ARCH set in the environment.
 182 # The default ARCH is the host where make is executed.
 183
 184 # CROSS_COMPILE specify the prefix used for all executables used
 185 # during compilation. Only gcc and related bin-utils executables
 186 # are prefixed with $(CROSS_COMPILE).
 187 # CROSS_COMPILE can be set on the command line
 188 # make CROSS_COMPILE=ia64-linux-
 189 # Alternatively CROSS_COMPILE can be set in the environment.
 190 # Default value for CROSS_COMPILE is not to prefix executables
 191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192
 193 ARCH            ?= $(SUBARCH)
 194 CROSS_COMPILE   ?=
 195
 196 # Architecture as present in compile.h
 197 UTS_MACHINE := $(ARCH)
 198
 199 # SHELL used by kbuild
 200 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 201           else if [ -x /bin/bash ]; then echo /bin/bash; \
 202           else echo sh; fi ; fi)
 203
 204 HOSTCC          = gcc
 205 HOSTCXX         = g++
 206 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 207 HOSTCXXFLAGS    = -O2
 208
 209 #       Decide whether to build built-in, modular, or both.
 210 #       Normally, just do built-in.
 211
 212 KBUILD_MODULES :=
 213 KBUILD_BUILTIN := 1
 214
 215 #       If we have only "make modules", don't compile built-in objects.
 216 #       When we're building modules with modversions, we need to consider
 217 #       the built-in objects during the descend as well, in order to
 218 #       make sure the checksums are uptodate before we record them.
 219
 220 ifeq ($(MAKECMDGOALS),modules)
 221   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 222 endif
 223
 224 #       If we have "make <whatever> modules", compile modules
 225 #       in addition to whatever we do anyway.
 226 #       Just "make" or "make all" shall build modules as well
 227
 228 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 229   KBUILD_MODULES := 1
 230 endif
 231
 232 ifeq ($(MAKECMDGOALS),)
 233   KBUILD_MODULES := 1
 234 endif
 235
 236 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
 237 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 238
 239 # Beautify output
 240 # ---------------------------------------------------------------------------
 241 #
 242 # Normally, we echo the whole command before executing it. By making
 243 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 244 # $(quiet) to choose other forms of output instead, e.g.
 245 #
 246 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 247 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 248 #
 249 # If $(quiet) is empty, the whole command will be printed.
 250 # If it is set to "quiet_", only the short version will be printed.
 251 # If it is set to "silent_", nothing wil be printed at all, since
 252 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 253 #
 254 # A simple variant is to prefix commands with $(Q) - that's usefull
 255 # for commands that shall be hidden in non-verbose mode.
 256 #
 257 #       $(Q)ln $@ :<
 258 #
 259 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 260 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 261
 262 ifeq ($(KBUILD_VERBOSE),1)
 263   quiet =
 264   Q =
 265 else
 266   quiet=quiet_
 267   Q = @
 268 endif
 269
 270 # If the user is running make -s (silent mode), suppress echoing of
 271 # commands
 272
 273 ifneq ($(findstring s,$(MAKEFLAGS)),)
 274   quiet=silent_
 275 endif
 276
 277 export quiet Q KBUILD_VERBOSE
 278
 279 ######
 280 # cc support functions to be used (only) in arch/$(ARCH)/Makefile
 281 # See documentation in Documentation/kbuild/makefiles.txt
 282
 283 # cc-option
 284 # Usage: cflags-y += $(call gcc-option, -march=winchip-c6, -march=i586)
 285
 286 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 287              > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 288
 289 # For backward compatibility
 290 check_gcc = $(warning check_gcc is deprecated - use cc-option) \
 291             $(call cc-option, $(1),$(2))
 292
 293 # cc-option-yn
 294 # Usage: flag := $(call cc-option-yn, -march=winchip-c6)
 295 cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 296                 > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
 297
 298 # cc-option-align
 299 # Prefix align with either -falign or -malign
 300 cc-option-align = $(subst -functions=0,,\
 301         $(call cc-option,-falign-functions=0,-malign-functions=0))
 302
 303 # cc-version
 304 # Usage gcc-ver := $(call cc-version $(CC))
 305 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
 306               $(if $(1), $(1), $(CC)))
 307
 308
 309 # Look for make include files relative to root of kernel src
 310 MAKEFLAGS += --include-dir=$(srctree)
 311
 312 # For maximum performance (+ possibly random breakage, uncomment
 313 # the following)
 314
 315 #MAKEFLAGS += -rR
 316
 317 # Make variables (CC, etc...)
 318
 319 AS              = $(CROSS_COMPILE)as
 320 LD              = $(CROSS_COMPILE)ld
 321 CC              = $(CROSS_COMPILE)gcc
 322 CPP             = $(CC) -E
 323 AR              = $(CROSS_COMPILE)ar
 324 NM              = $(CROSS_COMPILE)nm
 325 STRIP           = $(CROSS_COMPILE)strip
 326 OBJCOPY         = $(CROSS_COMPILE)objcopy
 327 OBJDUMP         = $(CROSS_COMPILE)objdump
 328 AWK             = awk
 329 GENKSYMS        = scripts/genksyms/genksyms
 330 DEPMOD          = /sbin/depmod
 331 KALLSYMS        = scripts/kallsyms
 332 PERL            = perl
 333 CHECK           = sparse
 334
 335 NOSTDINC_FLAGS  = -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 336 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__
 337 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 338 MODFLAGS        = -DMODULE
 339 CFLAGS_MODULE   = $(MODFLAGS)
 340 AFLAGS_MODULE   = $(MODFLAGS)
 341 LDFLAGS_MODULE  = -r
 342 CFLAGS_KERNEL   =
 343 AFLAGS_KERNEL   =
 344
 345
 346 # Use LINUXINCLUDE when you must reference the include/ directory.
 347 # Needed to be compatible with the O= option
 348 LINUXINCLUDE    := -Iinclude \
 349                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
 350
 351 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 352
 353 CFLAGS          := -Wall -Wstrict-prototypes -Wno-trigraphs \
 354                    -fno-strict-aliasing -fno-common \
 355                    -ffreestanding
 356 AFLAGS          := -D__ASSEMBLY__
 357
 358 export  VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \
 359         ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 360         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 361         HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 362
 363 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 364 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 365 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 366
 367 # When compiling out-of-tree modules, put MODVERDIR in the module
 368 # tree rather than in the kernel tree. The kernel tree might
 369 # even be read-only.
 370 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 371
 372 # The temporary file to save gcc -MD generated dependencies must not
 373 # contain a comma
 374 comma := ,
 375 depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
 376
 377 # Files to ignore in find ... statements
 378
 379 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc \) -prune -o
 380 RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc
 381
 382 # ===========================================================================
 383 # Rules shared between *config targets and build targets
 384
 385 # Basic helpers built in scripts/
 386 .PHONY: scripts_basic
 387 scripts_basic:
 388         $(Q)$(MAKE) $(build)=scripts/basic
 389
 390 .PHONY: outputmakefile
 391 # outputmakefile generate a Makefile to be placed in output directory, if
 392 # using a seperate output directory. This allows convinient use
 393 # of make in output directory
 394 outputmakefile:
 395         $(Q)if test ! $(srctree) -ef $(objtree); then \
 396         $(CONFIG_SHELL) $(srctree)/scripts/mkmakefile              \
 397             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)         \
 398             > $(objtree)/Makefile;                                 \
 399             echo '  GEN    $(objtree)/Makefile';                   \
 400         fi
 401
 402 # To make sure we do not include .config for any of the *config targets
 403 # catch them early, and hand them over to scripts/kconfig/Makefile
 404 # It is allowed to specify more targets when calling make, including
 405 # mixing *config targets and build targets.
 406 # For example 'make oldconfig all'.
 407 # Detect when mixed targets is specified, and make a second invocation
 408 # of make so .config is not included in this case either (for *config).
 409
 410 no-dot-config-targets := clean mrproper distclean \
 411                          cscope TAGS tags help %docs check%
 412
 413 config-targets := 0
 414 mixed-targets  := 0
 415 dot-config     := 1
 416
 417 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 418         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 419                 dot-config := 0
 420         endif
 421 endif
 422
 423 ifeq ($(KBUILD_EXTMOD),)
 424         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 425                 config-targets := 1
 426                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 427                         mixed-targets := 1
 428                 endif
 429         endif
 430 endif
 431
 432 ifeq ($(mixed-targets),1)
 433 # ===========================================================================
 434 # We're called with mixed targets (*config and build targets).
 435 # Handle them one by one.
 436
 437 %:: FORCE
 438         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 439
 440 else
 441 ifeq ($(config-targets),1)
 442 # ===========================================================================
 443 # *config targets only - make sure prerequisites are updated, and descend
 444 # in scripts/kconfig to make the *config target
 445
 446 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 447 # KBUILD_DEFCONFIG may point out an alternative default configuration
 448 # used for 'make defconfig'
 449 include $(srctree)/arch/$(ARCH)/Makefile
 450 export KBUILD_DEFCONFIG
 451
 452 config: scripts_basic outputmakefile FORCE
 453         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 454 %config: scripts_basic outputmakefile FORCE
 455         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 456
 457 else
 458 # ===========================================================================
 459 # Build targets only - this includes vmlinux, arch specific targets, clean
 460 # targets and others. In general all targets except *config targets.
 461
 462 ifeq ($(KBUILD_EXTMOD),)
 463 # Additional helpers built in scripts/
 464 # Carefully list dependencies so we do not try to build scripts twice
 465 # in parrallel
 466 .PHONY: scripts
 467 scripts: scripts_basic include/config/MARKER
 468         $(Q)$(MAKE) $(build)=$(@)
 469
 470 scripts_basic: include/linux/autoconf.h
 471
 472 # Objects we will link into vmlinux / subdirs we need to visit
 473 init-y          := init/
 474 drivers-y       := drivers/ sound/
 475 net-y           := net/
 476 libs-y          := lib/
 477 core-y          := usr/
 478 endif # KBUILD_EXTMOD
 479
 480 ifeq ($(dot-config),1)
 481 # In this section, we need .config
 482
 483 # Read in dependencies to all Kconfig* files, make sure to run
 484 # oldconfig if changes are detected.
 485 -include .config.cmd
 486
 487 include .config
 488
 489 # If .config needs to be updated, it will be done via the dependency
 490 # that autoconf has on .config.
 491 # To avoid any implicit rule to kick in, define an empty command
 492 .config: ;
 493
 494 # If .config is newer than include/linux/autoconf.h, someone tinkered
 495 # with it and forgot to run make oldconfig
 496 include/linux/autoconf.h: .config
 497         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 498 else
 499 # Dummy target needed, because used as prerequisite
 500 include/linux/autoconf.h: ;
 501 endif
 502
 503 # The all: target is the default when no target is given on the
 504 # command line.
 505 # This allow a user to issue only 'make' to build a kernel including modules
 506 # Defaults vmlinux but it is usually overriden in the arch makefile
 507 all: vmlinux
 508
 509 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 510 CFLAGS          += -Os
 511 else
 512 CFLAGS          += -O2
 513 endif
 514
 515 #Add align options if CONFIG_CC_* is not equal to 0
 516 add-align = $(if $(filter-out 0,$($(1))),$(cc-option-align)$(2)=$($(1)))
 517 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_FUNCTIONS,-functions)
 518 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LABELS,-labels)
 519 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
 520 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
 521
 522 ifdef CONFIG_FRAME_POINTER
 523 CFLAGS          += -fno-omit-frame-pointer
 524 else
 525 CFLAGS          += -fomit-frame-pointer
 526 endif
 527
 528 ifdef CONFIG_DEBUG_INFO
 529 CFLAGS          += -g
 530 endif
 531
 532 include $(srctree)/arch/$(ARCH)/Makefile
 533
 534 # warn about C99 declaration after statement
 535 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 536
 537 # disable pointer signedness warnings in gcc 4.0
 538 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 539
 540 # Default kernel image to build when no specific target is given.
 541 # KBUILD_IMAGE may be overruled on the commandline or
 542 # set in the environment
 543 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 544 # this default value
 545 export KBUILD_IMAGE ?= vmlinux
 546
 547 #
 548 # INSTALL_PATH specifies where to place the updated kernel and system map
 549 # images. Default is /boot, but you can set it to other values
 550 export  INSTALL_PATH ?= /boot
 551
 552 #
 553 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 554 # relocations required by build roots.  This is not defined in the
 555 # makefile but the arguement can be passed to make if needed.
 556 #
 557
 558 MODLIB  := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 559 export MODLIB
 560
 561
 562 ifeq ($(KBUILD_EXTMOD),)
 563 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/
 564
 565 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 566                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 567                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 568
 569 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 570                      $(init-n) $(init-) \
 571                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 572                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 573
 574 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 575 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 576 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 577 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 578 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 579 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 580 libs-y          := $(libs-y1) $(libs-y2)
 581
 582 # Build vmlinux
 583 # ---------------------------------------------------------------------------
 584 # vmlinux is build from the objects selected by $(vmlinux-init) and
 585 # $(vmlinux-main). Most are built-in.o files from top-level directories
 586 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 587 # Ordering when linking is important, and $(vmlinux-init) must be first.
 588 #
 589 # vmlinux
 590 #   ^
 591 #   |
 592 #   +-< $(vmlinux-init)
 593 #   |   +--< init/version.o + more
 594 #   |
 595 #   +--< $(vmlinux-main)
 596 #   |    +--< driver/built-in.o mm/built-in.o + more
 597 #   |
 598 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 599 #
 600 # vmlinux version (uname -v) cannot be updated during normal
 601 # descending-into-subdirs phase since we do not yet know if we need to
 602 # update vmlinux.
 603 # Therefore this step is delayed until just before final link of vmlinux -
 604 # except in the kallsyms case where it is done just before adding the
 605 # symbols to the kernel.
 606 #
 607 # System.map is generated to document addresses of all kernel symbols
 608
 609 vmlinux-init := $(head-y) $(init-y)
 610 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 611 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 612 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 613
 614 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 615 # May be overridden by arch/$(ARCH)/Makefile
 616 quiet_cmd_vmlinux__ ?= LD      $@
 617       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 618       -T $(vmlinux-lds) $(vmlinux-init)                          \
 619       --start-group $(vmlinux-main) --end-group                  \
 620       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 621
 622 # Generate new vmlinux version
 623 quiet_cmd_vmlinux_version = GEN     .version
 624       cmd_vmlinux_version = set -e;                     \
 625         . $(srctree)/scripts/mkversion > .tmp_version;  \
 626         mv -f .tmp_version .version;                    \
 627         $(MAKE) $(build)=init
 628
 629 # Generate System.map
 630 quiet_cmd_sysmap = SYSMAP
 631       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 632
 633 # Link of vmlinux
 634 # If CONFIG_KALLSYMS is set .version is already updated
 635 # Generate System.map and verify that the content is consistent
 636
 637 define rule_vmlinux__
 638         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 639
 640         $(call cmd,vmlinux__)
 641         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 642
 643         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 644           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 645         $(cmd_sysmap) $@ System.map;                    \
 646         if [ $$? -ne 0 ]; then                          \
 647                 rm -f $@;                               \
 648                 /bin/false;                             \
 649         fi;
 650         $(verify_kallsyms)
 651 endef
 652
 653
 654 ifdef CONFIG_KALLSYMS
 655 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 656 # It's a three stage process:
 657 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 658 #   empty
 659 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 660 #   the right size - vmlinux version (uname -v) is updated during this step
 661 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 662 #   but due to the added section, some addresses have shifted.
 663 #   From here, we generate a correct .tmp_kallsyms2.o
 664 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 665 # o Verify that the System.map from vmlinux matches the map from
 666 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 667 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 668 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 669 #   temporary bypass to allow the kernel to be built while the
 670 #   maintainers work out what went wrong with kallsyms.
 671
 672 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 673 last_kallsyms := 3
 674 else
 675 last_kallsyms := 2
 676 endif
 677
 678 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 679
 680 define verify_kallsyms
 681         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 682           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 683           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 684         $(Q)cmp -s System.map .tmp_System.map ||              \
 685                 (echo Inconsistent kallsyms data;             \
 686                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 687                  rm .tmp_kallsyms* ; /bin/false )
 688 endef
 689
 690 # Update vmlinux version before link
 691 # Use + in front of this rule to silent warning about make -j1
 692 cmd_ksym_ld = $(cmd_vmlinux__)
 693 define rule_ksym_ld
 694         +$(call cmd,vmlinux_version)
 695         $(call cmd,vmlinux__)
 696         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 697 endef
 698
 699 # Generate .S file with all kernel symbols
 700 quiet_cmd_kallsyms = KSYM    $@
 701       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 702                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 703
 704 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 705         $(call if_changed_dep,as_o_S)
 706
 707 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 708         $(call cmd,kallsyms)
 709
 710 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 711 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 712         $(call if_changed_rule,ksym_ld)
 713
 714 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 715         $(call if_changed,vmlinux__)
 716
 717 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 718         $(call if_changed,vmlinux__)
 719
 720 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 721 $(KALLSYMS): scripts ;
 722
 723 endif # ifdef CONFIG_KALLSYMS
 724
 725 # vmlinux image - including updated kernel symbols
 726 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 727         $(call if_changed_rule,vmlinux__)
 728
 729 # The actual objects are generated when descending,
 730 # make sure no implicit rule kicks in
 731 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 732
 733 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 734 # Preset locale variables to speed up the build process. Limit locale
 735 # tweaks to this spot to avoid wrong language settings when running
 736 # make menuconfig etc.
 737 # Error messages still appears in the original language
 738
 739 .PHONY: $(vmlinux-dirs)
 740 $(vmlinux-dirs): prepare-all scripts
 741         $(Q)$(MAKE) $(build)=$@
 742
 743 # Things we need to do before we recursively start building the kernel
 744 # or the modules are listed in "prepare-all".
 745 # A multi level approach is used. prepare1 is updated first, then prepare0.
 746 # prepare-all is the collection point for the prepare targets.
 747
 748 .PHONY: prepare-all prepare prepare0 prepare1 prepare2
 749
 750 # prepare2 is used to check if we are building in a separate output directory,
 751 # and if so do:
 752 # 1) Check that make has not been executed in the kernel src $(srctree)
 753 # 2) Create the include2 directory, used for the second asm symlink
 754
 755 prepare2:
 756 ifneq ($(KBUILD_SRC),)
 757         @echo '  Using $(srctree) as source for kernel'
 758         $(Q)if [ -h $(srctree)/include/asm -o -f $(srctree)/.config ]; then \
 759                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 760                 echo "  in the '$(srctree)' directory.";\
 761                 /bin/false; \
 762         fi;
 763         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 764         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 765 endif
 766
 767 # prepare1 creates a makefile if using a separate output directory
 768 prepare1: prepare2 outputmakefile
 769
 770 prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
 771 ifneq ($(KBUILD_MODULES),)
 772         $(Q)rm -rf $(MODVERDIR)
 773         $(Q)mkdir -p $(MODVERDIR)
 774 endif
 775
 776 # All the preparing..
 777 prepare-all: prepare0 prepare
 778
 779 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 780 #       done in arch/$(ARCH)/kernel/Makefile
 781
 782 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 783
 784 # Single targets
 785 # ---------------------------------------------------------------------------
 786
 787 %.s: %.c scripts FORCE
 788         $(Q)$(MAKE) $(build)=$(@D) $@
 789 %.i: %.c scripts FORCE
 790         $(Q)$(MAKE) $(build)=$(@D) $@
 791 %.o: %.c scripts FORCE
 792         $(Q)$(MAKE) $(build)=$(@D) $@
 793 %/:      scripts prepare FORCE
 794         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
 795 %.lst: %.c scripts FORCE
 796         $(Q)$(MAKE) $(build)=$(@D) $@
 797 %.s: %.S scripts FORCE
 798         $(Q)$(MAKE) $(build)=$(@D) $@
 799 %.o: %.S scripts FORCE
 800         $(Q)$(MAKE) $(build)=$(@D) $@
 801
 802 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 803 #       hard to detect, but I suppose "make mrproper" is a good idea
 804 #       before switching between archs anyway.
 805
 806 include/asm:
 807         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 808         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 809         @ln -fsn asm-$(ARCH) $@
 810
 811 #       Split autoconf.h into include/linux/config/*
 812
 813 include/config/MARKER: include/linux/autoconf.h
 814         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 815         @scripts/basic/split-include include/linux/autoconf.h include/config
 816         @touch $@
 817
 818 # Generate some files
 819 # ---------------------------------------------------------------------------
 820
 821 # KERNELRELEASE can change from a few different places, meaning version.h
 822 # needs to be updated, so this check is forced on all builds
 823
 824 uts_len := 64
 825
 826 define filechk_version.h
 827         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 828           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 829           exit 1; \
 830         fi; \
 831         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 832           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 833          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 834         )
 835 endef
 836
 837 include/linux/version.h: $(srctree)/Makefile FORCE
 838         $(call filechk,version.h)
 839
 840 # ---------------------------------------------------------------------------
 841
 842 .PHONY: depend dep
 843 depend dep:
 844         @echo '*** Warning: make $@ is unnecessary now.'
 845
 846 # ---------------------------------------------------------------------------
 847 # Modules
 848
 849 ifdef CONFIG_MODULES
 850
 851 #       By default, build modules as well
 852
 853 all: modules
 854
 855 #       Build modules
 856
 857 .PHONY: modules
 858 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 859         @echo '  Building modules, stage 2.';
 860         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 861
 862
 863 # Target to prepare building external modules
 864 .PHONY: modules_prepare
 865 modules_prepare: prepare-all scripts
 866
 867 # Target to install modules
 868 .PHONY: modules_install
 869 modules_install: _modinst_ _modinst_post
 870
 871 .PHONY: _modinst_
 872 _modinst_:
 873         @if [ -z "`$(DEPMOD) -V | grep module-init-tools`" ]; then \
 874                 echo "Warning: you may need to install module-init-tools"; \
 875                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 876                 sleep 1; \
 877         fi
 878         @rm -rf $(MODLIB)/kernel
 879         @rm -f $(MODLIB)/source
 880         @mkdir -p $(MODLIB)/kernel
 881         @ln -s $(srctree) $(MODLIB)/source
 882         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 883                 rm -f $(MODLIB)/build ; \
 884                 ln -s $(objtree) $(MODLIB)/build ; \
 885         fi
 886         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 887
 888 # If System.map exists, run depmod.  This deliberately does not have a
 889 # dependency on System.map since that would run the dependency tree on
 890 # vmlinux.  This depmod is only for convenience to give the initial
 891 # boot a modules.dep even before / is mounted read-write.  However the
 892 # boot script depmod is the master version.
 893 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 894 depmod_opts     :=
 895 else
 896 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 897 endif
 898 .PHONY: _modinst_post
 899 _modinst_post: _modinst_
 900         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 901
 902 else # CONFIG_MODULES
 903
 904 # Modules not configured
 905 # ---------------------------------------------------------------------------
 906
 907 modules modules_install: FORCE
 908         @echo
 909         @echo "The present kernel configuration has modules disabled."
 910         @echo "Type 'make config' and enable loadable module support."
 911         @echo "Then build a kernel with module support enabled."
 912         @echo
 913         @exit 1
 914
 915 endif # CONFIG_MODULES
 916
 917 # Generate asm-offsets.h
 918 # ---------------------------------------------------------------------------
 919
 920 define filechk_gen-asm-offsets
 921         (set -e; \
 922          echo "#ifndef __ASM_OFFSETS_H__"; \
 923          echo "#define __ASM_OFFSETS_H__"; \
 924          echo "/*"; \
 925          echo " * DO NOT MODIFY."; \
 926          echo " *"; \
 927          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 928          echo " *"; \
 929          echo " */"; \
 930          echo ""; \
 931          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 932          echo ""; \
 933          echo "#endif" )
 934 endef
 935
 936
 937 ###
 938 # Cleaning is done on three levels.
 939 # make clean     Delete most generated files
 940 #                Leave enough to build external modules
 941 # make mrproper  Delete the current configuration, and all generated files
 942 # make distclean Remove editor backup files, patch leftover files and the like
 943
 944 # Directories & files removed with 'make clean'
 945 CLEAN_DIRS  += $(MODVERDIR)
 946 CLEAN_FILES +=  vmlinux System.map \
 947                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 948
 949 # Directories & files removed with 'make mrproper'
 950 MRPROPER_DIRS  += include/config include2
 951 MRPROPER_FILES += .config .config.old include/asm .version \
 952                   include/linux/autoconf.h include/linux/version.h \
 953                   Module.symvers tags TAGS cscope*
 954
 955 # clean - Delete most, but leave enough to build external modules
 956 #
 957 clean: rm-dirs  := $(CLEAN_DIRS)
 958 clean: rm-files := $(CLEAN_FILES)
 959 clean-dirs      := $(addprefix _clean_,$(vmlinux-alldirs))
 960
 961 .PHONY: $(clean-dirs) clean archclean
 962 $(clean-dirs):
 963         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 964
 965 clean: archclean $(clean-dirs)
 966         $(call cmd,rmdirs)
 967         $(call cmd,rmfiles)
 968         @find . $(RCS_FIND_IGNORE) \
 969                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 970                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 971                 -type f -print | xargs rm -f
 972
 973 # mrproper - Delete all generated files, including .config
 974 #
 975 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 976 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 977 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
 978
 979 .PHONY: $(mrproper-dirs) mrproper archmrproper
 980 $(mrproper-dirs):
 981         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 982
 983 mrproper: clean archmrproper $(mrproper-dirs)
 984         $(call cmd,rmdirs)
 985         $(call cmd,rmfiles)
 986
 987 # distclean
 988 #
 989 .PHONY: distclean
 990
 991 distclean: mrproper
 992         @find $(srctree) $(RCS_FIND_IGNORE) \
 993                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 994                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 995                 -o -name '.*.rej' -o -size 0 \
 996                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
 997                 -type f -print | xargs rm -f
 998
 999
1000 # Packaging of the kernel to various formats
1001 # ---------------------------------------------------------------------------
1002 # rpm target kept for backward compatibility
1003 package-dir     := $(srctree)/scripts/package
1004
1005 .PHONY: %-pkg rpm
1006
1007 %pkg: FORCE
1008         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1009 rpm: FORCE
1010         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1011
1012
1013 # Brief documentation of the typical targets used
1014 # ---------------------------------------------------------------------------
1015
1016 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1017 boards := $(notdir $(boards))
1018
1019 help:
1020         @echo  'Cleaning targets:'
1021         @echo  '  clean           - remove most generated files but keep the config'
1022         @echo  '  mrproper        - remove all generated files + config + various backup files'
1023         @echo  ''
1024         @echo  'Configuration targets:'
1025         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1026         @echo  ''
1027         @echo  'Other generic targets:'
1028         @echo  '  all             - Build all targets marked with [*]'
1029         @echo  '* vmlinux         - Build the bare kernel'
1030         @echo  '* modules         - Build all modules'
1031         @echo  '  modules_install - Install all modules'
1032         @echo  '  dir/            - Build all files in dir and below'
1033         @echo  '  dir/file.[ois]  - Build specified target only'
1034         @echo  '  rpm             - Build a kernel as an RPM package'
1035         @echo  '  tags/TAGS       - Generate tags file for editors'
1036         @echo  '  cscope          - Generate cscope index'
1037         @echo  ''
1038         @echo  'Static analysers'
1039         @echo  '  buildcheck      - List dangling references to vmlinux discarded sections'
1040         @echo  '                    and init sections from non-init sections'
1041         @echo  '  checkstack      - Generate a list of stack hogs'
1042         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1043         @echo  ''
1044         @echo  'Kernel packaging:'
1045         @$(MAKE) -f $(package-dir)/Makefile help
1046         @echo  ''
1047         @echo  'Documentation targets:'
1048         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1049         @echo  ''
1050         @echo  'Architecture specific targets ($(ARCH)):'
1051         @$(if $(archhelp),$(archhelp),\
1052                 echo '  No architecture specific help defined for $(ARCH)')
1053         @echo  ''
1054         @$(if $(boards), \
1055                 $(foreach b, $(boards), \
1056                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1057                 echo '')
1058
1059         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1060         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1061         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1062         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1063         @echo  ''
1064         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1065         @echo  'For further info see the ./README file'
1066
1067
1068 # Documentation targets
1069 # ---------------------------------------------------------------------------
1070 %docs: scripts_basic FORCE
1071         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1072
1073 else # KBUILD_EXTMOD
1074
1075 ###
1076 # External module support.
1077 # When building external modules the kernel used as basis is considered
1078 # read-only, and no consistency checks are made and the make
1079 # system is not used on the basis kernel. If updates are required
1080 # in the basis kernel ordinary make commands (without M=...) must
1081 # be used.
1082 #
1083 # The following are the only valid targets when building external
1084 # modules.
1085 # make M=dir clean     Delete all automatically generated files
1086 # make M=dir modules   Make all modules in specified dir
1087 # make M=dir           Same as 'make M=dir modules'
1088 # make M=dir modules_install
1089 #                      Install the modules build in the module directory
1090 #                      Assumes install directory is already created
1091
1092 # We are always building modules
1093 KBUILD_MODULES := 1
1094 .PHONY: crmodverdir
1095 crmodverdir:
1096         $(Q)mkdir -p $(MODVERDIR)
1097
1098 .PHONY: $(objtree)/Module.symvers
1099 $(objtree)/Module.symvers:
1100         @test -e $(objtree)/Module.symvers || ( \
1101         echo; \
1102         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1103         echo "           is missing; modules will have no dependencies and modversions."; \
1104         echo )
1105
1106 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1107 .PHONY: $(module-dirs) modules
1108 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1109         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1110
1111 modules: $(module-dirs)
1112         @echo '  Building modules, stage 2.';
1113         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1114
1115 .PHONY: modules_install
1116 modules_install:
1117         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1118
1119 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1120
1121 .PHONY: $(clean-dirs) clean
1122 $(clean-dirs):
1123         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1124
1125 clean:  rm-dirs := $(MODVERDIR)
1126 clean: $(clean-dirs)
1127         $(call cmd,rmdirs)
1128         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1129                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1130                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1131                 -type f -print | xargs rm -f
1132
1133 help:
1134         @echo  '  Building external modules.'
1135         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1136         @echo  ''
1137         @echo  '  modules         - default target, build the module(s)'
1138         @echo  '  modules_install - install the module'
1139         @echo  '  clean           - remove generated files in module directory only'
1140         @echo  ''
1141 endif # KBUILD_EXTMOD
1142
1143 # Generate tags for editors
1144 # ---------------------------------------------------------------------------
1145
1146 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1147 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1148 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1149
1150 ifeq ($(KBUILD_OUTPUT),)
1151 __srctree =
1152 else
1153 __srctree = $(srctree)/
1154 endif
1155
1156 define all-sources
1157         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1158                \( -name include -o -name arch \) -prune -o \
1159                -name '*.[chS]' -print; \
1160           find $(__srctree)arch/$(ARCH) $(RCS_FIND_IGNORE) \
1161                -name '*.[chS]' -print; \
1162           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1163                -name '*.[chS]' -print; \
1164           find $(__srctree)include $(RCS_FIND_IGNORE) \
1165                \( -name config -o -name 'asm-*' \) -prune \
1166                -o -name '*.[chS]' -print; \
1167           find $(__srctree)include/asm-$(ARCH) $(RCS_FIND_IGNORE) \
1168                -name '*.[chS]' -print; \
1169           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1170                -name '*.[chS]' -print )
1171 endef
1172
1173 quiet_cmd_cscope-file = FILELST cscope.files
1174       cmd_cscope-file = $(all-sources) > cscope.files
1175
1176 quiet_cmd_cscope = MAKE    cscope.out
1177       cmd_cscope = cscope -k -b -q
1178
1179 cscope: FORCE
1180         $(call cmd,cscope-file)
1181         $(call cmd,cscope)
1182
1183 quiet_cmd_TAGS = MAKE   $@
1184 cmd_TAGS = $(all-sources) | etags -
1185
1186 #       Exuberant ctags works better with -I
1187
1188 quiet_cmd_tags = MAKE   $@
1189 define cmd_tags
1190         rm -f $@; \
1191         CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL"`; \
1192         $(all-sources) | xargs ctags $$CTAGSF -a --extra=+f
1193 endef
1194
1195 TAGS: FORCE
1196         $(call cmd,TAGS)
1197
1198 tags: FORCE
1199         $(call cmd,tags)
1200
1201
1202 # Scripts to check various things for consistency
1203 # ---------------------------------------------------------------------------
1204
1205 configcheck:
1206         find * $(RCS_FIND_IGNORE) \
1207                 -name '*.[hcS]' -type f -print | sort \
1208                 | xargs $(PERL) -w scripts/checkconfig.pl
1209
1210 includecheck:
1211         find * $(RCS_FIND_IGNORE) \
1212                 -name '*.[hcS]' -type f -print | sort \
1213                 | xargs $(PERL) -w scripts/checkincludes.pl
1214
1215 versioncheck:
1216         find * $(RCS_FIND_IGNORE) \
1217                 -name '*.[hcS]' -type f -print | sort \
1218                 | xargs $(PERL) -w scripts/checkversion.pl
1219
1220 buildcheck:
1221         $(PERL) $(srctree)/scripts/reference_discarded.pl
1222         $(PERL) $(srctree)/scripts/reference_init.pl
1223
1224 namespacecheck:
1225         $(PERL) $(srctree)/scripts/namespace.pl
1226
1227 endif #ifeq ($(config-targets),1)
1228 endif #ifeq ($(mixed-targets),1)
1229
1230 .PHONY: checkstack
1231 checkstack:
1232         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1233         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1234
1235 kernelrelease:
1236         @echo $(KERNELRELEASE)
1237
1238 # FIXME Should go into a make.lib or something
1239 # ===========================================================================
1240
1241 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1242       cmd_rmdirs = rm -rf $(rm-dirs)
1243
1244 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1245       cmd_rmfiles = rm -f $(rm-files)
1246
1247
1248 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1249           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1250           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1251
1252 quiet_cmd_as_o_S = AS      $@
1253 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1254
1255 # read all saved command lines
1256
1257 targets := $(wildcard $(sort $(targets)))
1258 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1259
1260 ifneq ($(cmd_files),)
1261   $(cmd_files): ;       # Do not try to update included dependency files
1262   include $(cmd_files)
1263 endif
1264
1265 # Execute command and generate cmd file
1266 if_changed = $(if $(strip $? \
1267                           $(filter-out $(cmd_$(1)),$(cmd_$@))\
1268                           $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1269         @set -e; \
1270         $(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1271         $(cmd_$(1)); \
1272         echo 'cmd_$@ := $(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).cmd)
1273
1274
1275 # execute the command and also postprocess generated .d dependencies
1276 # file
1277 if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
1278                           $(filter-out $(cmd_$(1)),$(cmd_$@))\
1279                           $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1280         $(Q)set -e; \
1281         $(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1282         $(cmd_$(1)); \
1283         scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
1284         rm -f $(depfile); \
1285         mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
1286
1287 # Usage: $(call if_changed_rule,foo)
1288 # will check if $(cmd_foo) changed, or any of the prequisites changed,
1289 # and if so will execute $(rule_foo)
1290
1291 if_changed_rule = $(if $(strip $? \
1292                                $(filter-out $(cmd_$(1)),$(cmd_$(@F)))\
1293                                $(filter-out $(cmd_$(@F)),$(cmd_$(1)))),\
1294                        $(Q)$(rule_$(1)))
1295
1296 # If quiet is set, only print short version of command
1297
1298 cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
1299
1300 # filechk is used to check if the content of a generated file is updated.
1301 # Sample usage:
1302 # define filechk_sample
1303 #       echo $KERNELRELEASE
1304 # endef
1305 # version.h : Makefile
1306 #       $(call filechk,sample)
1307 # The rule defined shall write to stdout the content of the new file.
1308 # The existing file will be compared with the new one.
1309 # - If no file exist it is created
1310 # - If the content differ the new file is used
1311 # - If they are equal no change, and no timestamp update
1312
1313 define filechk
1314         @set -e;                                \
1315         echo '  CHK     $@';                    \
1316         mkdir -p $(dir $@);                     \
1317         $(filechk_$(1)) < $< > $@.tmp;          \
1318         if [ -r $@ ] && cmp -s $@ $@.tmp; then  \
1319                 rm -f $@.tmp;                   \
1320         else                                    \
1321                 echo '  UPD     $@';            \
1322                 mv -f $@.tmp $@;                \
1323         fi
1324 endef
1325
1326 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1327 # Usage:
1328 # $(Q)$(MAKE) $(build)=dir
1329 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
1330
1331 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1332 # Usage:
1333 # $(Q)$(MAKE) $(clean)=dir
1334 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1335
1336 #       $(call descend,<dir>,<target>)
1337 #       Recursively call a sub-make in <dir> with target <target>
1338 # Usage is deprecated, because make does not see this as an invocation of make.
1339 descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
1340
1341 endif   # skip-makefile
1342
1343 FORCE: