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         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 450
 451 else
 452 # Dummy target needed, because used as prerequisite
 453 include/config/auto.conf: ;
 454 endif
 455
 456 # The all: target is the default when no target is given on the
 457 # command line.
 458 # This allow a user to issue only 'make' to build a kernel including modules
 459 # Defaults vmlinux but it is usually overriden in the arch makefile
 460 all: vmlinux
 461
 462 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 463 CFLAGS          += -Os
 464 else
 465 CFLAGS          += -O2
 466 endif
 467
 468 ifdef CONFIG_FRAME_POINTER
 469 CFLAGS          += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 470 else
 471 CFLAGS          += -fomit-frame-pointer
 472 endif
 473
 474 ifdef CONFIG_UNWIND_INFO
 475 CFLAGS          += -fasynchronous-unwind-tables
 476 endif
 477
 478 ifdef CONFIG_DEBUG_INFO
 479 CFLAGS          += -g
 480 endif
 481
 482 include $(srctree)/arch/$(ARCH)/Makefile
 483
 484 # arch Makefile may override CC so keep this after arch Makefile is included
 485 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 486 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 487
 488 # warn about C99 declaration after statement
 489 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 490
 491 # disable pointer signedness warnings in gcc 4.0
 492 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 493
 494 # Default kernel image to build when no specific target is given.
 495 # KBUILD_IMAGE may be overruled on the commandline or
 496 # set in the environment
 497 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 498 # this default value
 499 export KBUILD_IMAGE ?= vmlinux
 500
 501 #
 502 # INSTALL_PATH specifies where to place the updated kernel and system map
 503 # images. Default is /boot, but you can set it to other values
 504 export  INSTALL_PATH ?= /boot
 505
 506 #
 507 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 508 # relocations required by build roots.  This is not defined in the
 509 # makefile but the arguement can be passed to make if needed.
 510 #
 511
 512 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 513 export MODLIB
 514
 515 #
 516 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 517 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 518 #  the default option --strip-debug will be used.  Otherwise,
 519 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 520
 521 ifdef INSTALL_MOD_STRIP
 522 ifeq ($(INSTALL_MOD_STRIP),1)
 523 mod_strip_cmd = $STRIP) --strip-debug
 524 else
 525 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 526 endif # INSTALL_MOD_STRIP=1
 527 else
 528 mod_strip_cmd = true
 529 endif # INSTALL_MOD_STRIP
 530 export mod_strip_cmd
 531
 532
 533 ifeq ($(KBUILD_EXTMOD),)
 534 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 535
 536 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 537                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 538                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 539
 540 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 541                      $(init-n) $(init-) \
 542                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 543                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 544
 545 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 546 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 547 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 548 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 549 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 550 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 551 libs-y          := $(libs-y1) $(libs-y2)
 552
 553 # Build vmlinux
 554 # ---------------------------------------------------------------------------
 555 # vmlinux is build from the objects selected by $(vmlinux-init) and
 556 # $(vmlinux-main). Most are built-in.o files from top-level directories
 557 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 558 # Ordering when linking is important, and $(vmlinux-init) must be first.
 559 #
 560 # vmlinux
 561 #   ^
 562 #   |
 563 #   +-< $(vmlinux-init)
 564 #   |   +--< init/version.o + more
 565 #   |
 566 #   +--< $(vmlinux-main)
 567 #   |    +--< driver/built-in.o mm/built-in.o + more
 568 #   |
 569 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 570 #
 571 # vmlinux version (uname -v) cannot be updated during normal
 572 # descending-into-subdirs phase since we do not yet know if we need to
 573 # update vmlinux.
 574 # Therefore this step is delayed until just before final link of vmlinux -
 575 # except in the kallsyms case where it is done just before adding the
 576 # symbols to the kernel.
 577 #
 578 # System.map is generated to document addresses of all kernel symbols
 579
 580 vmlinux-init := $(head-y) $(init-y)
 581 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 582 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 583 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 584
 585 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 586 # May be overridden by arch/$(ARCH)/Makefile
 587 quiet_cmd_vmlinux__ ?= LD      $@
 588       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 589       -T $(vmlinux-lds) $(vmlinux-init)                          \
 590       --start-group $(vmlinux-main) --end-group                  \
 591       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 592
 593 # Generate new vmlinux version
 594 quiet_cmd_vmlinux_version = GEN     .version
 595       cmd_vmlinux_version = set -e;                     \
 596         if [ ! -r .version ]; then                      \
 597           rm -f .version;                               \
 598           echo 1 >.version;                             \
 599         else                                            \
 600           mv .version .old_version;                     \
 601           expr 0$$(cat .old_version) + 1 >.version;     \
 602         fi;                                             \
 603         $(MAKE) $(build)=init
 604
 605 # Generate System.map
 606 quiet_cmd_sysmap = SYSMAP
 607       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 608
 609 # Link of vmlinux
 610 # If CONFIG_KALLSYMS is set .version is already updated
 611 # Generate System.map and verify that the content is consistent
 612 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 613 # First command is ':' to allow us to use + in front of the rule
 614 define rule_vmlinux__
 615         :
 616         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 617
 618         $(call cmd,vmlinux__)
 619         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 620
 621         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 622           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 623         $(cmd_sysmap) $@ System.map;                    \
 624         if [ $$? -ne 0 ]; then                          \
 625                 rm -f $@;                               \
 626                 /bin/false;                             \
 627         fi;
 628         $(verify_kallsyms)
 629 endef
 630
 631
 632 ifdef CONFIG_KALLSYMS
 633 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 634 # It's a three stage process:
 635 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 636 #   empty
 637 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 638 #   the right size - vmlinux version (uname -v) is updated during this step
 639 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 640 #   but due to the added section, some addresses have shifted.
 641 #   From here, we generate a correct .tmp_kallsyms2.o
 642 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 643 # o Verify that the System.map from vmlinux matches the map from
 644 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 645 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 646 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 647 #   temporary bypass to allow the kernel to be built while the
 648 #   maintainers work out what went wrong with kallsyms.
 649
 650 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 651 last_kallsyms := 3
 652 else
 653 last_kallsyms := 2
 654 endif
 655
 656 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 657
 658 define verify_kallsyms
 659         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 660           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 661           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 662         $(Q)cmp -s System.map .tmp_System.map ||              \
 663                 (echo Inconsistent kallsyms data;             \
 664                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 665                  rm .tmp_kallsyms* ; /bin/false )
 666 endef
 667
 668 # Update vmlinux version before link
 669 # Use + in front of this rule to silent warning about make -j1
 670 # First command is ':' to allow us to use + in front of this rule
 671 cmd_ksym_ld = $(cmd_vmlinux__)
 672 define rule_ksym_ld
 673         :
 674         +$(call cmd,vmlinux_version)
 675         $(call cmd,vmlinux__)
 676         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 677 endef
 678
 679 # Generate .S file with all kernel symbols
 680 quiet_cmd_kallsyms = KSYM    $@
 681       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 682                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 683
 684 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 685         $(call if_changed_dep,as_o_S)
 686
 687 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 688         $(call cmd,kallsyms)
 689
 690 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 691 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 692         $(call if_changed_rule,ksym_ld)
 693
 694 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 695         $(call if_changed,vmlinux__)
 696
 697 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 698         $(call if_changed,vmlinux__)
 699
 700 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 701 $(KALLSYMS): scripts ;
 702
 703 # Generate some data for debugging strange kallsyms problems
 704 debug_kallsyms: .tmp_map$(last_kallsyms)
 705
 706 .tmp_map%: .tmp_vmlinux% FORCE
 707         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 708
 709 .tmp_map3: .tmp_map2
 710
 711 .tmp_map2: .tmp_map1
 712
 713 endif # ifdef CONFIG_KALLSYMS
 714
 715 # vmlinux image - including updated kernel symbols
 716 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 717         $(call if_changed_rule,vmlinux__)
 718         $(Q)rm -f .old_version
 719
 720 # The actual objects are generated when descending,
 721 # make sure no implicit rule kicks in
 722 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 723
 724 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 725 # Preset locale variables to speed up the build process. Limit locale
 726 # tweaks to this spot to avoid wrong language settings when running
 727 # make menuconfig etc.
 728 # Error messages still appears in the original language
 729
 730 PHONY += $(vmlinux-dirs)
 731 $(vmlinux-dirs): prepare scripts
 732         $(Q)$(MAKE) $(build)=$@
 733
 734 # Build the kernel release string
 735 # The KERNELRELEASE is stored in a file named include/config/kernel.release
 736 # to be used when executing for example make install or make modules_install
 737 #
 738 # Take the contents of any files called localversion* and the config
 739 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
 740 # LOCALVERSION from the command line override all of this
 741
 742 nullstring :=
 743 space      := $(nullstring) # end of line
 744
 745 ___localver = $(objtree)/localversion* $(srctree)/localversion*
 746 __localver  = $(sort $(wildcard $(___localver)))
 747 # skip backup files (containing '~')
 748 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
 749
 750 localver = $(subst $(space),, \
 751            $(shell cat /dev/null $(_localver)) \
 752            $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 753
 754 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 755 # and if the SCM is know a tag from the SCM is appended.
 756 # The appended tag is determinded by the SCM used.
 757 #
 758 # Currently, only git is supported.
 759 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 760 # checks as needed.
 761 ifdef CONFIG_LOCALVERSION_AUTO
 762         _localver-auto = $(shell $(CONFIG_SHELL) \
 763                           $(srctree)/scripts/setlocalversion $(srctree))
 764         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 765 endif
 766
 767 localver-full = $(localver)$(localver-auto)
 768
 769 # Store (new) KERNELRELASE string in include/config/kernel.release
 770 kernelrelease = $(KERNELVERSION)$(localver-full)
 771 include/config/kernel.release: include/config/auto.conf FORCE
 772         $(Q)rm -f $@
 773         $(Q)echo $(kernelrelease) > $@
 774
 775
 776 # Things we need to do before we recursively start building the kernel
 777 # or the modules are listed in "prepare".
 778 # A multi level approach is used. prepareN is processed before prepareN-1.
 779 # archprepare is used in arch Makefiles and when processed asm symlink,
 780 # version.h and scripts_basic is processed / created.
 781
 782 # Listed in dependency order
 783 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 784
 785 # prepare-all is deprecated, use prepare as valid replacement
 786 PHONY += prepare-all
 787
 788 # prepare3 is used to check if we are building in a separate output directory,
 789 # and if so do:
 790 # 1) Check that make has not been executed in the kernel src $(srctree)
 791 # 2) Create the include2 directory, used for the second asm symlink
 792 prepare3: include/config/kernel.release
 793 ifneq ($(KBUILD_SRC),)
 794         @echo '  Using $(srctree) as source for kernel'
 795         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 796                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 797                 echo "  in the '$(srctree)' directory.";\
 798                 /bin/false; \
 799         fi;
 800         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 801         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 802 endif
 803
 804 # prepare2 creates a makefile if using a separate output directory
 805 prepare2: prepare3 outputmakefile
 806
 807 prepare1: prepare2 include/linux/version.h include/asm \
 808                    include/config/auto.conf
 809 ifneq ($(KBUILD_MODULES),)
 810         $(Q)mkdir -p $(MODVERDIR)
 811         $(Q)rm -f $(MODVERDIR)/*
 812 endif
 813
 814 archprepare: prepare1 scripts_basic
 815
 816 prepare0: archprepare FORCE
 817         $(Q)$(MAKE) $(build)=.
 818
 819 # All the preparing..
 820 prepare prepare-all: prepare0
 821
 822 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 823 #       done in arch/$(ARCH)/kernel/Makefile
 824
 825 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 826
 827 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 828 #       hard to detect, but I suppose "make mrproper" is a good idea
 829 #       before switching between archs anyway.
 830
 831 include/asm:
 832         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 833         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 834         @ln -fsn asm-$(ARCH) $@
 835
 836 # Generate some files
 837 # ---------------------------------------------------------------------------
 838
 839 # KERNELRELEASE can change from a few different places, meaning version.h
 840 # needs to be updated, so this check is forced on all builds
 841
 842 uts_len := 64
 843
 844 define filechk_version.h
 845         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 846           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 847           exit 1; \
 848         fi; \
 849         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 850           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 851          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 852         )
 853 endef
 854
 855 include/linux/version.h: $(srctree)/Makefile include/config/kernel.release FORCE
 856         $(call filechk,version.h)
 857
 858 # ---------------------------------------------------------------------------
 859
 860 PHONY += depend dep
 861 depend dep:
 862         @echo '*** Warning: make $@ is unnecessary now.'
 863
 864 # ---------------------------------------------------------------------------
 865 # Modules
 866
 867 ifdef CONFIG_MODULES
 868
 869 #       By default, build modules as well
 870
 871 all: modules
 872
 873 #       Build modules
 874
 875 PHONY += modules
 876 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 877         @echo '  Building modules, stage 2.';
 878         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 879
 880
 881 # Target to prepare building external modules
 882 PHONY += modules_prepare
 883 modules_prepare: prepare scripts
 884
 885 # Target to install modules
 886 PHONY += modules_install
 887 modules_install: _modinst_ _modinst_post
 888
 889 PHONY += _modinst_
 890 _modinst_:
 891         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 892                 echo "Warning: you may need to install module-init-tools"; \
 893                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 894                 sleep 1; \
 895         fi
 896         @rm -rf $(MODLIB)/kernel
 897         @rm -f $(MODLIB)/source
 898         @mkdir -p $(MODLIB)/kernel
 899         @ln -s $(srctree) $(MODLIB)/source
 900         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 901                 rm -f $(MODLIB)/build ; \
 902                 ln -s $(objtree) $(MODLIB)/build ; \
 903         fi
 904         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 905
 906 # If System.map exists, run depmod.  This deliberately does not have a
 907 # dependency on System.map since that would run the dependency tree on
 908 # vmlinux.  This depmod is only for convenience to give the initial
 909 # boot a modules.dep even before / is mounted read-write.  However the
 910 # boot script depmod is the master version.
 911 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 912 depmod_opts     :=
 913 else
 914 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 915 endif
 916 PHONY += _modinst_post
 917 _modinst_post: _modinst_
 918         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 919
 920 else # CONFIG_MODULES
 921
 922 # Modules not configured
 923 # ---------------------------------------------------------------------------
 924
 925 modules modules_install: FORCE
 926         @echo
 927         @echo "The present kernel configuration has modules disabled."
 928         @echo "Type 'make config' and enable loadable module support."
 929         @echo "Then build a kernel with module support enabled."
 930         @echo
 931         @exit 1
 932
 933 endif # CONFIG_MODULES
 934
 935 ###
 936 # Cleaning is done on three levels.
 937 # make clean     Delete most generated files
 938 #                Leave enough to build external modules
 939 # make mrproper  Delete the current configuration, and all generated files
 940 # make distclean Remove editor backup files, patch leftover files and the like
 941
 942 # Directories & files removed with 'make clean'
 943 CLEAN_DIRS  += $(MODVERDIR)
 944 CLEAN_FILES +=  vmlinux System.map \
 945                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 946
 947 # Directories & files removed with 'make mrproper'
 948 MRPROPER_DIRS  += include/config include2
 949 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
 950                   include/linux/autoconf.h include/linux/version.h \
 951                   Module.symvers tags TAGS cscope*
 952
 953 # clean - Delete most, but leave enough to build external modules
 954 #
 955 clean: rm-dirs  := $(CLEAN_DIRS)
 956 clean: rm-files := $(CLEAN_FILES)
 957 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
 958
 959 PHONY += $(clean-dirs) clean archclean
 960 $(clean-dirs):
 961         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 962
 963 clean: archclean $(clean-dirs)
 964         $(call cmd,rmdirs)
 965         $(call cmd,rmfiles)
 966         @find . $(RCS_FIND_IGNORE) \
 967                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 968                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 969                 -type f -print | xargs rm -f
 970
 971 # mrproper - Delete all generated files, including .config
 972 #
 973 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 974 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 975 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
 976
 977 PHONY += $(mrproper-dirs) mrproper archmrproper
 978 $(mrproper-dirs):
 979         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 980
 981 mrproper: clean archmrproper $(mrproper-dirs)
 982         $(call cmd,rmdirs)
 983         $(call cmd,rmfiles)
 984
 985 # distclean
 986 #
 987 PHONY += distclean
 988
 989 distclean: mrproper
 990         @find $(srctree) $(RCS_FIND_IGNORE) \
 991                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 992                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 993                 -o -name '.*.rej' -o -size 0 \
 994                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
 995                 -type f -print | xargs rm -f
 996
 997
 998 # Packaging of the kernel to various formats
 999 # ---------------------------------------------------------------------------
1000 # rpm target kept for backward compatibility
1001 package-dir     := $(srctree)/scripts/package
1002
1003 %pkg: include/config/kernel.release FORCE
1004         $(Q)$(MAKE) $(build)=$(package-dir) $@
1005 rpm: include/config/kernel.release FORCE
1006         $(Q)$(MAKE) $(build)=$(package-dir) $@
1007
1008
1009 # Brief documentation of the typical targets used
1010 # ---------------------------------------------------------------------------
1011
1012 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1013 boards := $(notdir $(boards))
1014
1015 help:
1016         @echo  'Cleaning targets:'
1017         @echo  '  clean           - remove most generated files but keep the config'
1018         @echo  '  mrproper        - remove all generated files + config + various backup files'
1019         @echo  ''
1020         @echo  'Configuration targets:'
1021         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1022         @echo  ''
1023         @echo  'Other generic targets:'
1024         @echo  '  all             - Build all targets marked with [*]'
1025         @echo  '* vmlinux         - Build the bare kernel'
1026         @echo  '* modules         - Build all modules'
1027         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1028         @echo  '  dir/            - Build all files in dir and below'
1029         @echo  '  dir/file.[ois]  - Build specified target only'
1030         @echo  '  dir/file.ko     - Build module including final link'
1031         @echo  '  rpm             - Build a kernel as an RPM package'
1032         @echo  '  tags/TAGS       - Generate tags file for editors'
1033         @echo  '  cscope          - Generate cscope index'
1034         @echo  '  kernelrelease   - Output the release version string'
1035         @echo  '  kernelversion   - Output the version stored in Makefile'
1036         @echo  ''
1037         @echo  'Static analysers'
1038         @echo  '  checkstack      - Generate a list of stack hogs'
1039         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1040         @echo  ''
1041         @echo  'Kernel packaging:'
1042         @$(MAKE) $(build)=$(package-dir) help
1043         @echo  ''
1044         @echo  'Documentation targets:'
1045         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1046         @echo  ''
1047         @echo  'Architecture specific targets ($(ARCH)):'
1048         @$(if $(archhelp),$(archhelp),\
1049                 echo '  No architecture specific help defined for $(ARCH)')
1050         @echo  ''
1051         @$(if $(boards), \
1052                 $(foreach b, $(boards), \
1053                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1054                 echo '')
1055
1056         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1057         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1058         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1059         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1060         @echo  ''
1061         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1062         @echo  'For further info see the ./README file'
1063
1064
1065 # Documentation targets
1066 # ---------------------------------------------------------------------------
1067 %docs: scripts_basic FORCE
1068         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1069
1070 else # KBUILD_EXTMOD
1071
1072 ###
1073 # External module support.
1074 # When building external modules the kernel used as basis is considered
1075 # read-only, and no consistency checks are made and the make
1076 # system is not used on the basis kernel. If updates are required
1077 # in the basis kernel ordinary make commands (without M=...) must
1078 # be used.
1079 #
1080 # The following are the only valid targets when building external
1081 # modules.
1082 # make M=dir clean     Delete all automatically generated files
1083 # make M=dir modules   Make all modules in specified dir
1084 # make M=dir           Same as 'make M=dir modules'
1085 # make M=dir modules_install
1086 #                      Install the modules build in the module directory
1087 #                      Assumes install directory is already created
1088
1089 # We are always building modules
1090 KBUILD_MODULES := 1
1091 PHONY += crmodverdir
1092 crmodverdir:
1093         $(Q)mkdir -p $(MODVERDIR)
1094         $(Q)rm -f $(MODVERDIR)/*
1095
1096 PHONY += $(objtree)/Module.symvers
1097 $(objtree)/Module.symvers:
1098         @test -e $(objtree)/Module.symvers || ( \
1099         echo; \
1100         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1101         echo "           is missing; modules will have no dependencies and modversions."; \
1102         echo )
1103
1104 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1105 PHONY += $(module-dirs) modules
1106 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1107         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1108
1109 modules: $(module-dirs)
1110         @echo '  Building modules, stage 2.';
1111         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1112
1113 PHONY += modules_install
1114 modules_install: _emodinst_ _emodinst_post
1115
1116 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1117 PHONY += _emodinst_
1118 _emodinst_:
1119         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1120         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1121
1122 # Run depmod only is we have System.map and depmod is executable
1123 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1124       cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1125                       $(DEPMOD) -ae -F System.map             \
1126                       $(if $(strip $(INSTALL_MOD_PATH)),      \
1127                       -b $(INSTALL_MOD_PATH) -r)              \
1128                       $(KERNELRELEASE);                       \
1129                    fi
1130
1131 PHONY += _emodinst_post
1132 _emodinst_post: _emodinst_
1133         $(call cmd,depmod)
1134
1135 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1136
1137 PHONY += $(clean-dirs) clean
1138 $(clean-dirs):
1139         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1140
1141 clean:  rm-dirs := $(MODVERDIR)
1142 clean: $(clean-dirs)
1143         $(call cmd,rmdirs)
1144         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1145                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1146                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1147                 -type f -print | xargs rm -f
1148
1149 help:
1150         @echo  '  Building external modules.'
1151         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1152         @echo  ''
1153         @echo  '  modules         - default target, build the module(s)'
1154         @echo  '  modules_install - install the module'
1155         @echo  '  clean           - remove generated files in module directory only'
1156         @echo  ''
1157
1158 # Dummies...
1159 PHONY += prepare scripts
1160 prepare: ;
1161 scripts: ;
1162 endif # KBUILD_EXTMOD
1163
1164 # Generate tags for editors
1165 # ---------------------------------------------------------------------------
1166
1167 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1168 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1169 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1170
1171 ifeq ($(src),$(obj))
1172 __srctree =
1173 else
1174 __srctree = $(srctree)/
1175 endif
1176
1177 ifeq ($(ALLSOURCE_ARCHS),)
1178 ifeq ($(ARCH),um)
1179 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1180 else
1181 ALLINCLUDE_ARCHS := $(ARCH)
1182 endif
1183 else
1184 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1185 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1186 endif
1187
1188 ALLSOURCE_ARCHS := $(ARCH)
1189
1190 define all-sources
1191         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1192                \( -name include -o -name arch \) -prune -o \
1193                -name '*.[chS]' -print; \
1194           for ARCH in $(ALLSOURCE_ARCHS) ; do \
1195                find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1196                     -name '*.[chS]' -print; \
1197           done ; \
1198           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1199                -name '*.[chS]' -print; \
1200           find $(__srctree)include $(RCS_FIND_IGNORE) \
1201                \( -name config -o -name 'asm-*' \) -prune \
1202                -o -name '*.[chS]' -print; \
1203           for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1204                find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1205                     -name '*.[chS]' -print; \
1206           done ; \
1207           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1208                -name '*.[chS]' -print )
1209 endef
1210
1211 quiet_cmd_cscope-file = FILELST cscope.files
1212       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1213
1214 quiet_cmd_cscope = MAKE    cscope.out
1215       cmd_cscope = cscope -b
1216
1217 cscope: FORCE
1218         $(call cmd,cscope-file)
1219         $(call cmd,cscope)
1220
1221 quiet_cmd_TAGS = MAKE   $@
1222 define cmd_TAGS
1223         rm -f $@; \
1224         ETAGSF=`etags --version | grep -i exuberant >/dev/null &&     \
1225                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1226                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1227                       --extra=+f --c-kinds=+px"`;                     \
1228                 $(all-sources) | xargs etags $$ETAGSF -a
1229 endef
1230
1231 TAGS: FORCE
1232         $(call cmd,TAGS)
1233
1234
1235 quiet_cmd_tags = MAKE   $@
1236 define cmd_tags
1237         rm -f $@; \
1238         CTAGSF=`ctags --version | grep -i exuberant >/dev/null &&     \
1239                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1240                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1241                       --extra=+f --c-kinds=+px"`;                     \
1242                 $(all-sources) | xargs ctags $$CTAGSF -a
1243 endef
1244
1245 tags: FORCE
1246         $(call cmd,tags)
1247
1248
1249 # Scripts to check various things for consistency
1250 # ---------------------------------------------------------------------------
1251
1252 includecheck:
1253         find * $(RCS_FIND_IGNORE) \
1254                 -name '*.[hcS]' -type f -print | sort \
1255                 | xargs $(PERL) -w scripts/checkincludes.pl
1256
1257 versioncheck:
1258         find * $(RCS_FIND_IGNORE) \
1259                 -name '*.[hcS]' -type f -print | sort \
1260                 | xargs $(PERL) -w scripts/checkversion.pl
1261
1262 namespacecheck:
1263         $(PERL) $(srctree)/scripts/namespace.pl
1264
1265 endif #ifeq ($(config-targets),1)
1266 endif #ifeq ($(mixed-targets),1)
1267
1268 PHONY += checkstack kernelrelease kernelversion
1269 checkstack:
1270         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1271         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1272
1273 kernelrelease:
1274         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1275         $(error kernelrelease not valid - run 'make prepare' to update it))
1276 kernelversion:
1277         @echo $(KERNELVERSION)
1278
1279 # Single targets
1280 # ---------------------------------------------------------------------------
1281 # Single targets are compatible with:
1282 # - build whith mixed source and output
1283 # - build with separate output dir 'make O=...'
1284 # - external modules
1285 #
1286 #  target-dir => where to store outputfile
1287 #  build-dir  => directory in kernel source tree to use
1288
1289 ifeq ($(KBUILD_EXTMOD),)
1290         build-dir  = $(patsubst %/,%,$(dir $@))
1291         target-dir = $(dir $@)
1292 else
1293         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1294         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1295         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1296 endif
1297
1298 %.s: %.c prepare scripts FORCE
1299         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1300 %.i: %.c prepare scripts FORCE
1301         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1302 %.o: %.c prepare scripts FORCE
1303         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1304 %.lst: %.c prepare scripts FORCE
1305         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1306 %.s: %.S prepare scripts FORCE
1307         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1308 %.o: %.S prepare scripts FORCE
1309         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1310
1311 # Modules
1312 / %/: prepare scripts FORCE
1313         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1314         $(build)=$(build-dir)
1315 %.ko: prepare scripts FORCE
1316         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1317         $(build)=$(build-dir) $(@:.ko=.o)
1318         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1319
1320 # FIXME Should go into a make.lib or something
1321 # ===========================================================================
1322
1323 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1324       cmd_rmdirs = rm -rf $(rm-dirs)
1325
1326 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1327       cmd_rmfiles = rm -f $(rm-files)
1328
1329
1330 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1331           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1332           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1333
1334 quiet_cmd_as_o_S = AS      $@
1335 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1336
1337 # read all saved command lines
1338
1339 targets := $(wildcard $(sort $(targets)))
1340 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1341
1342 ifneq ($(cmd_files),)
1343   $(cmd_files): ;       # Do not try to update included dependency files
1344   include $(cmd_files)
1345 endif
1346
1347 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1348 # Usage:
1349 # $(Q)$(MAKE) $(clean)=dir
1350 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1351
1352 endif   # skip-makefile
1353
1354 PHONY += FORCE
1355 FORCE:
1356
1357
1358 # Declare the contents of the .PHONY variable as phony.  We keep that
1359 # information in a variable se we can use it in if_changed and friends.
1360 .PHONY: $(PHONY)