Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 17
   4 EXTRAVERSION =-rc6
   5 NAME=Crazed Snow-Weasel
   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           := $(srctree)$(if $(KBUILD_EXTMOD),:$(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 KCONFIG_CONFIG  ?= .config
 182
 183 # SHELL used by kbuild
 184 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 185           else if [ -x /bin/bash ]; then echo /bin/bash; \
 186           else echo sh; fi ; fi)
 187
 188 HOSTCC          = gcc
 189 HOSTCXX         = g++
 190 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 191 HOSTCXXFLAGS    = -O2
 192
 193 #       Decide whether to build built-in, modular, or both.
 194 #       Normally, just do built-in.
 195
 196 KBUILD_MODULES :=
 197 KBUILD_BUILTIN := 1
 198
 199 #       If we have only "make modules", don't compile built-in objects.
 200 #       When we're building modules with modversions, we need to consider
 201 #       the built-in objects during the descend as well, in order to
 202 #       make sure the checksums are uptodate before we record them.
 203
 204 ifeq ($(MAKECMDGOALS),modules)
 205   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 206 endif
 207
 208 #       If we have "make <whatever> modules", compile modules
 209 #       in addition to whatever we do anyway.
 210 #       Just "make" or "make all" shall build modules as well
 211
 212 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 213   KBUILD_MODULES := 1
 214 endif
 215
 216 ifeq ($(MAKECMDGOALS),)
 217   KBUILD_MODULES := 1
 218 endif
 219
 220 export KBUILD_MODULES KBUILD_BUILTIN
 221 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 222
 223 # Beautify output
 224 # ---------------------------------------------------------------------------
 225 #
 226 # Normally, we echo the whole command before executing it. By making
 227 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 228 # $(quiet) to choose other forms of output instead, e.g.
 229 #
 230 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 231 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 232 #
 233 # If $(quiet) is empty, the whole command will be printed.
 234 # If it is set to "quiet_", only the short version will be printed.
 235 # If it is set to "silent_", nothing wil be printed at all, since
 236 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 237 #
 238 # A simple variant is to prefix commands with $(Q) - that's useful
 239 # for commands that shall be hidden in non-verbose mode.
 240 #
 241 #       $(Q)ln $@ :<
 242 #
 243 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 244 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 245
 246 ifeq ($(KBUILD_VERBOSE),1)
 247   quiet =
 248   Q =
 249 else
 250   quiet=quiet_
 251   Q = @
 252 endif
 253
 254 # If the user is running make -s (silent mode), suppress echoing of
 255 # commands
 256
 257 ifneq ($(findstring s,$(MAKEFLAGS)),)
 258   quiet=silent_
 259 endif
 260
 261 export quiet Q KBUILD_VERBOSE
 262
 263
 264 # Look for make include files relative to root of kernel src
 265 MAKEFLAGS += --include-dir=$(srctree)
 266
 267 # We need some generic definitions
 268 include  $(srctree)/scripts/Kbuild.include
 269
 270 # Do not use make's built-in rules and variables
 271 # This increases performance and avoid hard-to-debug behaviour
 272 MAKEFLAGS += -rR
 273
 274 # Make variables (CC, etc...)
 275
 276 AS              = $(CROSS_COMPILE)as
 277 LD              = $(CROSS_COMPILE)ld
 278 CC              = $(CROSS_COMPILE)gcc
 279 CPP             = $(CC) -E
 280 AR              = $(CROSS_COMPILE)ar
 281 NM              = $(CROSS_COMPILE)nm
 282 STRIP           = $(CROSS_COMPILE)strip
 283 OBJCOPY         = $(CROSS_COMPILE)objcopy
 284 OBJDUMP         = $(CROSS_COMPILE)objdump
 285 AWK             = awk
 286 GENKSYMS        = scripts/genksyms/genksyms
 287 DEPMOD          = /sbin/depmod
 288 KALLSYMS        = scripts/kallsyms
 289 PERL            = perl
 290 CHECK           = sparse
 291
 292 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 293 MODFLAGS        = -DMODULE
 294 CFLAGS_MODULE   = $(MODFLAGS)
 295 AFLAGS_MODULE   = $(MODFLAGS)
 296 LDFLAGS_MODULE  = -r
 297 CFLAGS_KERNEL   =
 298 AFLAGS_KERNEL   =
 299
 300
 301 # Use LINUXINCLUDE when you must reference the include/ directory.
 302 # Needed to be compatible with the O= option
 303 LINUXINCLUDE    := -Iinclude \
 304                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 305                    -include include/linux/autoconf.h
 306
 307 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 308
 309 CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 310                    -fno-strict-aliasing -fno-common
 311 AFLAGS          := -D__ASSEMBLY__
 312
 313 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 314 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 315 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 316
 317 export  VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
 318         ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 319         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 320         HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 321
 322 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 323 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 324 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 325
 326 # When compiling out-of-tree modules, put MODVERDIR in the module
 327 # tree rather than in the kernel tree. The kernel tree might
 328 # even be read-only.
 329 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 330
 331 # Files to ignore in find ... statements
 332
 333 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
 334 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 335
 336 # ===========================================================================
 337 # Rules shared between *config targets and build targets
 338
 339 # Basic helpers built in scripts/
 340 PHONY += scripts_basic
 341 scripts_basic:
 342         $(Q)$(MAKE) $(build)=scripts/basic
 343
 344 # To avoid any implicit rule to kick in, define an empty command.
 345 scripts/basic/%: scripts_basic ;
 346
 347 PHONY += outputmakefile
 348 # outputmakefile generates a Makefile in the output directory, if using a
 349 # separate output directory. This allows convenient use of make in the
 350 # output directory.
 351 outputmakefile:
 352 ifneq ($(KBUILD_SRC),)
 353         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 354             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 355 endif
 356
 357 # To make sure we do not include .config for any of the *config targets
 358 # catch them early, and hand them over to scripts/kconfig/Makefile
 359 # It is allowed to specify more targets when calling make, including
 360 # mixing *config targets and build targets.
 361 # For example 'make oldconfig all'.
 362 # Detect when mixed targets is specified, and make a second invocation
 363 # of make so .config is not included in this case either (for *config).
 364
 365 no-dot-config-targets := clean mrproper distclean \
 366                          cscope TAGS tags help %docs check% \
 367                          kernelrelease kernelversion
 368
 369 config-targets := 0
 370 mixed-targets  := 0
 371 dot-config     := 1
 372
 373 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 374         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 375                 dot-config := 0
 376         endif
 377 endif
 378
 379 ifeq ($(KBUILD_EXTMOD),)
 380         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 381                 config-targets := 1
 382                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 383                         mixed-targets := 1
 384                 endif
 385         endif
 386 endif
 387
 388 ifeq ($(mixed-targets),1)
 389 # ===========================================================================
 390 # We're called with mixed targets (*config and build targets).
 391 # Handle them one by one.
 392
 393 %:: FORCE
 394         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 395
 396 else
 397 ifeq ($(config-targets),1)
 398 # ===========================================================================
 399 # *config targets only - make sure prerequisites are updated, and descend
 400 # in scripts/kconfig to make the *config target
 401
 402 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 403 # KBUILD_DEFCONFIG may point out an alternative default configuration
 404 # used for 'make defconfig'
 405 include $(srctree)/arch/$(ARCH)/Makefile
 406 export KBUILD_DEFCONFIG
 407
 408 config %config: scripts_basic outputmakefile FORCE
 409         $(Q)mkdir -p include/linux include/config
 410         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 411
 412 else
 413 # ===========================================================================
 414 # Build targets only - this includes vmlinux, arch specific targets, clean
 415 # targets and others. In general all targets except *config targets.
 416
 417 ifeq ($(KBUILD_EXTMOD),)
 418 # Additional helpers built in scripts/
 419 # Carefully list dependencies so we do not try to build scripts twice
 420 # in parrallel
 421 PHONY += scripts
 422 scripts: scripts_basic include/config/auto.conf
 423         $(Q)$(MAKE) $(build)=$(@)
 424
 425 # Objects we will link into vmlinux / subdirs we need to visit
 426 init-y          := init/
 427 drivers-y       := drivers/ sound/
 428 net-y           := net/
 429 libs-y          := lib/
 430 core-y          := usr/
 431 endif # KBUILD_EXTMOD
 432
 433 ifeq ($(dot-config),1)
 434 # In this section, we need .config
 435
 436 # Read in dependencies to all Kconfig* files, make sure to run
 437 # oldconfig if changes are detected.
 438 -include include/config/auto.conf.cmd
 439 -include include/config/auto.conf
 440
 441 # To avoid any implicit rule to kick in, define an empty command
 442 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 443
 444 # If .config is newer than include/config/auto.conf, someone tinkered
 445 # with it and forgot to run make oldconfig.
 446 # if auto.conf.cmd is missing then we are probarly in a cleaned tree so
 447 # we execute the config step to be sure to catch updated Kconfig files
 448 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 449 ifeq ($(KBUILD_EXTMOD),)
 450         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 451 else
 452         $(error kernel configuration not valid - run 'make prepare' in $(srctree) to update it)
 453 endif
 454
 455 else
 456 # Dummy target needed, because used as prerequisite
 457 include/config/auto.conf: ;
 458 endif
 459
 460 # The all: target is the default when no target is given on the
 461 # command line.
 462 # This allow a user to issue only 'make' to build a kernel including modules
 463 # Defaults vmlinux but it is usually overriden in the arch makefile
 464 all: vmlinux
 465
 466 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 467 CFLAGS          += -Os
 468 else
 469 CFLAGS          += -O2
 470 endif
 471
 472 ifdef CONFIG_FRAME_POINTER
 473 CFLAGS          += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 474 else
 475 CFLAGS          += -fomit-frame-pointer
 476 endif
 477
 478 ifdef CONFIG_UNWIND_INFO
 479 CFLAGS          += -fasynchronous-unwind-tables
 480 endif
 481
 482 ifdef CONFIG_DEBUG_INFO
 483 CFLAGS          += -g
 484 endif
 485
 486 include $(srctree)/arch/$(ARCH)/Makefile
 487
 488 # arch Makefile may override CC so keep this after arch Makefile is included
 489 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 490 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 491
 492 # warn about C99 declaration after statement
 493 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 494
 495 # disable pointer signedness warnings in gcc 4.0
 496 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 497
 498 # Default kernel image to build when no specific target is given.
 499 # KBUILD_IMAGE may be overruled on the commandline or
 500 # set in the environment
 501 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 502 # this default value
 503 export KBUILD_IMAGE ?= vmlinux
 504
 505 #
 506 # INSTALL_PATH specifies where to place the updated kernel and system map
 507 # images. Default is /boot, but you can set it to other values
 508 export  INSTALL_PATH ?= /boot
 509
 510 #
 511 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 512 # relocations required by build roots.  This is not defined in the
 513 # makefile but the arguement can be passed to make if needed.
 514 #
 515
 516 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 517 export MODLIB
 518
 519 #
 520 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 521 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 522 #  the default option --strip-debug will be used.  Otherwise,
 523 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 524
 525 ifdef INSTALL_MOD_STRIP
 526 ifeq ($(INSTALL_MOD_STRIP),1)
 527 mod_strip_cmd = $STRIP) --strip-debug
 528 else
 529 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 530 endif # INSTALL_MOD_STRIP=1
 531 else
 532 mod_strip_cmd = true
 533 endif # INSTALL_MOD_STRIP
 534 export mod_strip_cmd
 535
 536
 537 ifeq ($(KBUILD_EXTMOD),)
 538 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 539
 540 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 541                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 542                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 543
 544 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 545                      $(init-n) $(init-) \
 546                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 547                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 548
 549 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 550 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 551 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 552 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 553 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 554 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 555 libs-y          := $(libs-y1) $(libs-y2)
 556
 557 # Build vmlinux
 558 # ---------------------------------------------------------------------------
 559 # vmlinux is build from the objects selected by $(vmlinux-init) and
 560 # $(vmlinux-main). Most are built-in.o files from top-level directories
 561 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 562 # Ordering when linking is important, and $(vmlinux-init) must be first.
 563 #
 564 # vmlinux
 565 #   ^
 566 #   |
 567 #   +-< $(vmlinux-init)
 568 #   |   +--< init/version.o + more
 569 #   |
 570 #   +--< $(vmlinux-main)
 571 #   |    +--< driver/built-in.o mm/built-in.o + more
 572 #   |
 573 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 574 #
 575 # vmlinux version (uname -v) cannot be updated during normal
 576 # descending-into-subdirs phase since we do not yet know if we need to
 577 # update vmlinux.
 578 # Therefore this step is delayed until just before final link of vmlinux -
 579 # except in the kallsyms case where it is done just before adding the
 580 # symbols to the kernel.
 581 #
 582 # System.map is generated to document addresses of all kernel symbols
 583
 584 vmlinux-init := $(head-y) $(init-y)
 585 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 586 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 587 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 588
 589 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 590 # May be overridden by arch/$(ARCH)/Makefile
 591 quiet_cmd_vmlinux__ ?= LD      $@
 592       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 593       -T $(vmlinux-lds) $(vmlinux-init)                          \
 594       --start-group $(vmlinux-main) --end-group                  \
 595       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 596
 597 # Generate new vmlinux version
 598 quiet_cmd_vmlinux_version = GEN     .version
 599       cmd_vmlinux_version = set -e;                     \
 600         if [ ! -r .version ]; then                      \
 601           rm -f .version;                               \
 602           echo 1 >.version;                             \
 603         else                                            \
 604           mv .version .old_version;                     \
 605           expr 0$$(cat .old_version) + 1 >.version;     \
 606         fi;                                             \
 607         $(MAKE) $(build)=init
 608
 609 # Generate System.map
 610 quiet_cmd_sysmap = SYSMAP
 611       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 612
 613 # Link of vmlinux
 614 # If CONFIG_KALLSYMS is set .version is already updated
 615 # Generate System.map and verify that the content is consistent
 616 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 617 # First command is ':' to allow us to use + in front of the rule
 618 define rule_vmlinux__
 619         :
 620         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 621
 622         $(call cmd,vmlinux__)
 623         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 624
 625         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 626           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 627         $(cmd_sysmap) $@ System.map;                    \
 628         if [ $$? -ne 0 ]; then                          \
 629                 rm -f $@;                               \
 630                 /bin/false;                             \
 631         fi;
 632         $(verify_kallsyms)
 633 endef
 634
 635
 636 ifdef CONFIG_KALLSYMS
 637 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 638 # It's a three stage process:
 639 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 640 #   empty
 641 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 642 #   the right size - vmlinux version (uname -v) is updated during this step
 643 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 644 #   but due to the added section, some addresses have shifted.
 645 #   From here, we generate a correct .tmp_kallsyms2.o
 646 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 647 # o Verify that the System.map from vmlinux matches the map from
 648 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 649 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 650 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 651 #   temporary bypass to allow the kernel to be built while the
 652 #   maintainers work out what went wrong with kallsyms.
 653
 654 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 655 last_kallsyms := 3
 656 else
 657 last_kallsyms := 2
 658 endif
 659
 660 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 661
 662 define verify_kallsyms
 663         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 664           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 665           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 666         $(Q)cmp -s System.map .tmp_System.map ||              \
 667                 (echo Inconsistent kallsyms data;             \
 668                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 669                  rm .tmp_kallsyms* ; /bin/false )
 670 endef
 671
 672 # Update vmlinux version before link
 673 # Use + in front of this rule to silent warning about make -j1
 674 # First command is ':' to allow us to use + in front of this rule
 675 cmd_ksym_ld = $(cmd_vmlinux__)
 676 define rule_ksym_ld
 677         :
 678         +$(call cmd,vmlinux_version)
 679         $(call cmd,vmlinux__)
 680         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 681 endef
 682
 683 # Generate .S file with all kernel symbols
 684 quiet_cmd_kallsyms = KSYM    $@
 685       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 686                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 687
 688 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 689         $(call if_changed_dep,as_o_S)
 690
 691 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 692         $(call cmd,kallsyms)
 693
 694 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 695 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 696         $(call if_changed_rule,ksym_ld)
 697
 698 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 699         $(call if_changed,vmlinux__)
 700
 701 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 702         $(call if_changed,vmlinux__)
 703
 704 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 705 $(KALLSYMS): scripts ;
 706
 707 # Generate some data for debugging strange kallsyms problems
 708 debug_kallsyms: .tmp_map$(last_kallsyms)
 709
 710 .tmp_map%: .tmp_vmlinux% FORCE
 711         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 712
 713 .tmp_map3: .tmp_map2
 714
 715 .tmp_map2: .tmp_map1
 716
 717 endif # ifdef CONFIG_KALLSYMS
 718
 719 # vmlinux image - including updated kernel symbols
 720 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 721         $(call if_changed_rule,vmlinux__)
 722         $(Q)rm -f .old_version
 723
 724 # The actual objects are generated when descending,
 725 # make sure no implicit rule kicks in
 726 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 727
 728 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 729 # Preset locale variables to speed up the build process. Limit locale
 730 # tweaks to this spot to avoid wrong language settings when running
 731 # make menuconfig etc.
 732 # Error messages still appears in the original language
 733
 734 PHONY += $(vmlinux-dirs)
 735 $(vmlinux-dirs): prepare scripts
 736         $(Q)$(MAKE) $(build)=$@
 737
 738 # Build the kernel release string
 739 # The KERNELRELEASE is stored in a file named include/config/kernel.release
 740 # to be used when executing for example make install or make modules_install
 741 #
 742 # Take the contents of any files called localversion* and the config
 743 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
 744 # LOCALVERSION from the command line override all of this
 745
 746 nullstring :=
 747 space      := $(nullstring) # end of line
 748
 749 ___localver = $(objtree)/localversion* $(srctree)/localversion*
 750 __localver  = $(sort $(wildcard $(___localver)))
 751 # skip backup files (containing '~')
 752 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
 753
 754 localver = $(subst $(space),, \
 755            $(shell cat /dev/null $(_localver)) \
 756            $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 757
 758 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 759 # and if the SCM is know a tag from the SCM is appended.
 760 # The appended tag is determinded by the SCM used.
 761 #
 762 # Currently, only git is supported.
 763 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 764 # checks as needed.
 765 ifdef CONFIG_LOCALVERSION_AUTO
 766         _localver-auto = $(shell $(CONFIG_SHELL) \
 767                           $(srctree)/scripts/setlocalversion $(srctree))
 768         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 769 endif
 770
 771 localver-full = $(localver)$(localver-auto)
 772
 773 # Store (new) KERNELRELASE string in include/config/kernel.release
 774 kernelrelease = $(KERNELVERSION)$(localver-full)
 775 include/config/kernel.release: include/config/auto.conf FORCE
 776         $(Q)rm -f $@
 777         $(Q)echo $(kernelrelease) > $@
 778
 779
 780 # Things we need to do before we recursively start building the kernel
 781 # or the modules are listed in "prepare".
 782 # A multi level approach is used. prepareN is processed before prepareN-1.
 783 # archprepare is used in arch Makefiles and when processed asm symlink,
 784 # version.h and scripts_basic is processed / created.
 785
 786 # Listed in dependency order
 787 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 788
 789 # prepare-all is deprecated, use prepare as valid replacement
 790 PHONY += prepare-all
 791
 792 # prepare3 is used to check if we are building in a separate output directory,
 793 # and if so do:
 794 # 1) Check that make has not been executed in the kernel src $(srctree)
 795 # 2) Create the include2 directory, used for the second asm symlink
 796 prepare3: include/config/kernel.release
 797 ifneq ($(KBUILD_SRC),)
 798         @echo '  Using $(srctree) as source for kernel'
 799         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 800                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 801                 echo "  in the '$(srctree)' directory.";\
 802                 /bin/false; \
 803         fi;
 804         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 805         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 806 endif
 807
 808 # prepare2 creates a makefile if using a separate output directory
 809 prepare2: prepare3 outputmakefile
 810
 811 prepare1: prepare2 include/linux/version.h include/asm \
 812                    include/config/auto.conf
 813 ifneq ($(KBUILD_MODULES),)
 814         $(Q)mkdir -p $(MODVERDIR)
 815         $(Q)rm -f $(MODVERDIR)/*
 816 endif
 817
 818 archprepare: prepare1 scripts_basic
 819
 820 prepare0: archprepare FORCE
 821         $(Q)$(MAKE) $(build)=.
 822
 823 # All the preparing..
 824 prepare prepare-all: prepare0
 825
 826 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 827 #       done in arch/$(ARCH)/kernel/Makefile
 828
 829 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 830
 831 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 832 #       hard to detect, but I suppose "make mrproper" is a good idea
 833 #       before switching between archs anyway.
 834
 835 include/asm:
 836         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 837         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 838         @ln -fsn asm-$(ARCH) $@
 839
 840 # Generate some files
 841 # ---------------------------------------------------------------------------
 842
 843 # KERNELRELEASE can change from a few different places, meaning version.h
 844 # needs to be updated, so this check is forced on all builds
 845
 846 uts_len := 64
 847
 848 define filechk_version.h
 849         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 850           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 851           exit 1; \
 852         fi; \
 853         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 854           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 855          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 856         )
 857 endef
 858
 859 include/linux/version.h: $(srctree)/Makefile include/config/kernel.release FORCE
 860         $(call filechk,version.h)
 861
 862 # ---------------------------------------------------------------------------
 863
 864 PHONY += depend dep
 865 depend dep:
 866         @echo '*** Warning: make $@ is unnecessary now.'
 867
 868 # ---------------------------------------------------------------------------
 869 # Modules
 870
 871 ifdef CONFIG_MODULES
 872
 873 #       By default, build modules as well
 874
 875 all: modules
 876
 877 #       Build modules
 878
 879 PHONY += modules
 880 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 881         @echo '  Building modules, stage 2.';
 882         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 883
 884
 885 # Target to prepare building external modules
 886 PHONY += modules_prepare
 887 modules_prepare: prepare scripts
 888
 889 # Target to install modules
 890 PHONY += modules_install
 891 modules_install: _modinst_ _modinst_post
 892
 893 PHONY += _modinst_
 894 _modinst_:
 895         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 896                 echo "Warning: you may need to install module-init-tools"; \
 897                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 898                 sleep 1; \
 899         fi
 900         @rm -rf $(MODLIB)/kernel
 901         @rm -f $(MODLIB)/source
 902         @mkdir -p $(MODLIB)/kernel
 903         @ln -s $(srctree) $(MODLIB)/source
 904         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 905                 rm -f $(MODLIB)/build ; \
 906                 ln -s $(objtree) $(MODLIB)/build ; \
 907         fi
 908         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 909
 910 # If System.map exists, run depmod.  This deliberately does not have a
 911 # dependency on System.map since that would run the dependency tree on
 912 # vmlinux.  This depmod is only for convenience to give the initial
 913 # boot a modules.dep even before / is mounted read-write.  However the
 914 # boot script depmod is the master version.
 915 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 916 depmod_opts     :=
 917 else
 918 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 919 endif
 920 PHONY += _modinst_post
 921 _modinst_post: _modinst_
 922         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 923
 924 else # CONFIG_MODULES
 925
 926 # Modules not configured
 927 # ---------------------------------------------------------------------------
 928
 929 modules modules_install: FORCE
 930         @echo
 931         @echo "The present kernel configuration has modules disabled."
 932         @echo "Type 'make config' and enable loadable module support."
 933         @echo "Then build a kernel with module support enabled."
 934         @echo
 935         @exit 1
 936
 937 endif # CONFIG_MODULES
 938
 939 ###
 940 # Cleaning is done on three levels.
 941 # make clean     Delete most generated files
 942 #                Leave enough to build external modules
 943 # make mrproper  Delete the current configuration, and all generated files
 944 # make distclean Remove editor backup files, patch leftover files and the like
 945
 946 # Directories & files removed with 'make clean'
 947 CLEAN_DIRS  += $(MODVERDIR)
 948 CLEAN_FILES +=  vmlinux System.map \
 949                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 950
 951 # Directories & files removed with 'make mrproper'
 952 MRPROPER_DIRS  += include/config include2
 953 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
 954                   include/linux/autoconf.h include/linux/version.h \
 955                   Module.symvers tags TAGS cscope*
 956
 957 # clean - Delete most, but leave enough to build external modules
 958 #
 959 clean: rm-dirs  := $(CLEAN_DIRS)
 960 clean: rm-files := $(CLEAN_FILES)
 961 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
 962
 963 PHONY += $(clean-dirs) clean archclean
 964 $(clean-dirs):
 965         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 966
 967 clean: archclean $(clean-dirs)
 968         $(call cmd,rmdirs)
 969         $(call cmd,rmfiles)
 970         @find . $(RCS_FIND_IGNORE) \
 971                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 972                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
 973                 -o -name '*.symtypes' \) \
 974                 -type f -print | xargs rm -f
 975
 976 # mrproper - Delete all generated files, including .config
 977 #
 978 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 979 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 980 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
 981
 982 PHONY += $(mrproper-dirs) mrproper archmrproper
 983 $(mrproper-dirs):
 984         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 985
 986 mrproper: clean archmrproper $(mrproper-dirs)
 987         $(call cmd,rmdirs)
 988         $(call cmd,rmfiles)
 989
 990 # distclean
 991 #
 992 PHONY += distclean
 993
 994 distclean: mrproper
 995         @find $(srctree) $(RCS_FIND_IGNORE) \
 996                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 997                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 998                 -o -name '.*.rej' -o -size 0 \
 999                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1000                 -type f -print | xargs rm -f
1001
1002
1003 # Packaging of the kernel to various formats
1004 # ---------------------------------------------------------------------------
1005 # rpm target kept for backward compatibility
1006 package-dir     := $(srctree)/scripts/package
1007
1008 %pkg: include/config/kernel.release FORCE
1009         $(Q)$(MAKE) $(build)=$(package-dir) $@
1010 rpm: include/config/kernel.release FORCE
1011         $(Q)$(MAKE) $(build)=$(package-dir) $@
1012
1013
1014 # Brief documentation of the typical targets used
1015 # ---------------------------------------------------------------------------
1016
1017 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1018 boards := $(notdir $(boards))
1019
1020 help:
1021         @echo  'Cleaning targets:'
1022         @echo  '  clean           - remove most generated files but keep the config'
1023         @echo  '  mrproper        - remove all generated files + config + various backup files'
1024         @echo  ''
1025         @echo  'Configuration targets:'
1026         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1027         @echo  ''
1028         @echo  'Other generic targets:'
1029         @echo  '  all             - Build all targets marked with [*]'
1030         @echo  '* vmlinux         - Build the bare kernel'
1031         @echo  '* modules         - Build all modules'
1032         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1033         @echo  '  dir/            - Build all files in dir and below'
1034         @echo  '  dir/file.[ois]  - Build specified target only'
1035         @echo  '  dir/file.ko     - Build module including final link'
1036         @echo  '  rpm             - Build a kernel as an RPM package'
1037         @echo  '  tags/TAGS       - Generate tags file for editors'
1038         @echo  '  cscope          - Generate cscope index'
1039         @echo  '  kernelrelease   - Output the release version string'
1040         @echo  '  kernelversion   - Output the version stored in Makefile'
1041         @echo  ''
1042         @echo  'Static analysers'
1043         @echo  '  checkstack      - Generate a list of stack hogs'
1044         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1045         @echo  ''
1046         @echo  'Kernel packaging:'
1047         @$(MAKE) $(build)=$(package-dir) help
1048         @echo  ''
1049         @echo  'Documentation targets:'
1050         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1051         @echo  ''
1052         @echo  'Architecture specific targets ($(ARCH)):'
1053         @$(if $(archhelp),$(archhelp),\
1054                 echo '  No architecture specific help defined for $(ARCH)')
1055         @echo  ''
1056         @$(if $(boards), \
1057                 $(foreach b, $(boards), \
1058                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1059                 echo '')
1060
1061         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1062         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1063         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1064         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1065         @echo  ''
1066         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1067         @echo  'For further info see the ./README file'
1068
1069
1070 # Documentation targets
1071 # ---------------------------------------------------------------------------
1072 %docs: scripts_basic FORCE
1073         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1074
1075 else # KBUILD_EXTMOD
1076
1077 ###
1078 # External module support.
1079 # When building external modules the kernel used as basis is considered
1080 # read-only, and no consistency checks are made and the make
1081 # system is not used on the basis kernel. If updates are required
1082 # in the basis kernel ordinary make commands (without M=...) must
1083 # be used.
1084 #
1085 # The following are the only valid targets when building external
1086 # modules.
1087 # make M=dir clean     Delete all automatically generated files
1088 # make M=dir modules   Make all modules in specified dir
1089 # make M=dir           Same as 'make M=dir modules'
1090 # make M=dir modules_install
1091 #                      Install the modules build in the module directory
1092 #                      Assumes install directory is already created
1093
1094 # We are always building modules
1095 KBUILD_MODULES := 1
1096 PHONY += crmodverdir
1097 crmodverdir:
1098         $(Q)mkdir -p $(MODVERDIR)
1099         $(Q)rm -f $(MODVERDIR)/*
1100
1101 PHONY += $(objtree)/Module.symvers
1102 $(objtree)/Module.symvers:
1103         @test -e $(objtree)/Module.symvers || ( \
1104         echo; \
1105         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1106         echo "           is missing; modules will have no dependencies and modversions."; \
1107         echo )
1108
1109 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1110 PHONY += $(module-dirs) modules
1111 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1112         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1113
1114 modules: $(module-dirs)
1115         @echo '  Building modules, stage 2.';
1116         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1117
1118 PHONY += modules_install
1119 modules_install: _emodinst_ _emodinst_post
1120
1121 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1122 PHONY += _emodinst_
1123 _emodinst_:
1124         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1125         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1126
1127 # Run depmod only is we have System.map and depmod is executable
1128 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1129       cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1130                       $(DEPMOD) -ae -F System.map             \
1131                       $(if $(strip $(INSTALL_MOD_PATH)),      \
1132                       -b $(INSTALL_MOD_PATH) -r)              \
1133                       $(KERNELRELEASE);                       \
1134                    fi
1135
1136 PHONY += _emodinst_post
1137 _emodinst_post: _emodinst_
1138         $(call cmd,depmod)
1139
1140 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1141
1142 PHONY += $(clean-dirs) clean
1143 $(clean-dirs):
1144         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1145
1146 clean:  rm-dirs := $(MODVERDIR)
1147 clean: $(clean-dirs)
1148         $(call cmd,rmdirs)
1149         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1150                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1151                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1152                 -type f -print | xargs rm -f
1153
1154 help:
1155         @echo  '  Building external modules.'
1156         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1157         @echo  ''
1158         @echo  '  modules         - default target, build the module(s)'
1159         @echo  '  modules_install - install the module'
1160         @echo  '  clean           - remove generated files in module directory only'
1161         @echo  ''
1162
1163 # Dummies...
1164 PHONY += prepare scripts
1165 prepare: ;
1166 scripts: ;
1167 endif # KBUILD_EXTMOD
1168
1169 # Generate tags for editors
1170 # ---------------------------------------------------------------------------
1171
1172 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1173 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1174 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1175
1176 ifeq ($(src),$(obj))
1177 __srctree =
1178 else
1179 __srctree = $(srctree)/
1180 endif
1181
1182 ifeq ($(ALLSOURCE_ARCHS),)
1183 ifeq ($(ARCH),um)
1184 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1185 else
1186 ALLINCLUDE_ARCHS := $(ARCH)
1187 endif
1188 else
1189 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1190 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1191 endif
1192
1193 ALLSOURCE_ARCHS := $(ARCH)
1194
1195 define all-sources
1196         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1197                \( -name include -o -name arch \) -prune -o \
1198                -name '*.[chS]' -print; \
1199           for ARCH in $(ALLSOURCE_ARCHS) ; do \
1200                find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1201                     -name '*.[chS]' -print; \
1202           done ; \
1203           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1204                -name '*.[chS]' -print; \
1205           find $(__srctree)include $(RCS_FIND_IGNORE) \
1206                \( -name config -o -name 'asm-*' \) -prune \
1207                -o -name '*.[chS]' -print; \
1208           for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1209                find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1210                     -name '*.[chS]' -print; \
1211           done ; \
1212           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1213                -name '*.[chS]' -print )
1214 endef
1215
1216 quiet_cmd_cscope-file = FILELST cscope.files
1217       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1218
1219 quiet_cmd_cscope = MAKE    cscope.out
1220       cmd_cscope = cscope -b
1221
1222 cscope: FORCE
1223         $(call cmd,cscope-file)
1224         $(call cmd,cscope)
1225
1226 quiet_cmd_TAGS = MAKE   $@
1227 define cmd_TAGS
1228         rm -f $@; \
1229         ETAGSF=`etags --version | grep -i exuberant >/dev/null &&     \
1230                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1231                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1232                       --extra=+f --c-kinds=+px"`;                     \
1233                 $(all-sources) | xargs etags $$ETAGSF -a
1234 endef
1235
1236 TAGS: FORCE
1237         $(call cmd,TAGS)
1238
1239
1240 quiet_cmd_tags = MAKE   $@
1241 define cmd_tags
1242         rm -f $@; \
1243         CTAGSF=`ctags --version | grep -i exuberant >/dev/null &&     \
1244                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1245                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1246                       --extra=+f --c-kinds=+px"`;                     \
1247                 $(all-sources) | xargs ctags $$CTAGSF -a
1248 endef
1249
1250 tags: FORCE
1251         $(call cmd,tags)
1252
1253
1254 # Scripts to check various things for consistency
1255 # ---------------------------------------------------------------------------
1256
1257 includecheck:
1258         find * $(RCS_FIND_IGNORE) \
1259                 -name '*.[hcS]' -type f -print | sort \
1260                 | xargs $(PERL) -w scripts/checkincludes.pl
1261
1262 versioncheck:
1263         find * $(RCS_FIND_IGNORE) \
1264                 -name '*.[hcS]' -type f -print | sort \
1265                 | xargs $(PERL) -w scripts/checkversion.pl
1266
1267 namespacecheck:
1268         $(PERL) $(srctree)/scripts/namespace.pl
1269
1270 endif #ifeq ($(config-targets),1)
1271 endif #ifeq ($(mixed-targets),1)
1272
1273 PHONY += checkstack kernelrelease kernelversion
1274 checkstack:
1275         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1276         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1277
1278 kernelrelease:
1279         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1280         $(error kernelrelease not valid - run 'make prepare' to update it))
1281 kernelversion:
1282         @echo $(KERNELVERSION)
1283
1284 # Single targets
1285 # ---------------------------------------------------------------------------
1286 # Single targets are compatible with:
1287 # - build whith mixed source and output
1288 # - build with separate output dir 'make O=...'
1289 # - external modules
1290 #
1291 #  target-dir => where to store outputfile
1292 #  build-dir  => directory in kernel source tree to use
1293
1294 ifeq ($(KBUILD_EXTMOD),)
1295         build-dir  = $(patsubst %/,%,$(dir $@))
1296         target-dir = $(dir $@)
1297 else
1298         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1299         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1300         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1301 endif
1302
1303 %.s: %.c prepare scripts FORCE
1304         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1305 %.i: %.c prepare scripts FORCE
1306         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1307 %.o: %.c prepare scripts FORCE
1308         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1309 %.lst: %.c prepare scripts FORCE
1310         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1311 %.s: %.S prepare scripts FORCE
1312         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1313 %.o: %.S prepare scripts FORCE
1314         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1315 %.symtypes: %.c prepare scripts FORCE
1316         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1317
1318 # Modules
1319 / %/: prepare scripts FORCE
1320         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1321         $(build)=$(build-dir)
1322 %.ko: prepare scripts FORCE
1323         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1324         $(build)=$(build-dir) $(@:.ko=.o)
1325         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1326
1327 # FIXME Should go into a make.lib or something
1328 # ===========================================================================
1329
1330 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1331       cmd_rmdirs = rm -rf $(rm-dirs)
1332
1333 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1334       cmd_rmfiles = rm -f $(rm-files)
1335
1336
1337 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1338           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1339           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1340
1341 quiet_cmd_as_o_S = AS      $@
1342 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1343
1344 # read all saved command lines
1345
1346 targets := $(wildcard $(sort $(targets)))
1347 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1348
1349 ifneq ($(cmd_files),)
1350   $(cmd_files): ;       # Do not try to update included dependency files
1351   include $(cmd_files)
1352 endif
1353
1354 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1355 # Usage:
1356 # $(Q)$(MAKE) $(clean)=dir
1357 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1358
1359 endif   # skip-makefile
1360
1361 PHONY += FORCE
1362 FORCE:
1363
1364
1365 # Declare the contents of the .PHONY variable as phony.  We keep that
1366 # information in a variable se we can use it in if_changed and friends.
1367 .PHONY: $(PHONY)