Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 17
   4 EXTRAVERSION =
   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 = $(V)
  38   endif
  39 endif
  40 ifndef KBUILD_VERBOSE
  41   KBUILD_VERBOSE = 0
  42 endif
  43
  44 # Call checker as part of compilation of C files
  45 # Use 'make C=1' to enable checking (sparse, by default)
  46 # Override with 'make C=1 CHECK=checker_executable CHECKFLAGS=....'
  47
  48 ifdef C
  49   ifeq ("$(origin C)", "command line")
  50     KBUILD_CHECKSRC = $(C)
  51   endif
  52 endif
  53 ifndef KBUILD_CHECKSRC
  54   KBUILD_CHECKSRC = 0
  55 endif
  56
  57 # Use make M=dir to specify directory of external module to build
  58 # Old syntax make ... SUBDIRS=$PWD is still supported
  59 # Setting the environment variable KBUILD_EXTMOD take precedence
  60 ifdef SUBDIRS
  61   KBUILD_EXTMOD ?= $(SUBDIRS)
  62 endif
  63 ifdef M
  64   ifeq ("$(origin M)", "command line")
  65     KBUILD_EXTMOD := $(M)
  66   endif
  67 endif
  68
  69
  70 # kbuild supports saving output files in a separate directory.
  71 # To locate output files in a separate directory two syntaxes are supported.
  72 # In both cases the working directory must be the root of the kernel src.
  73 # 1) O=
  74 # Use "make O=dir/to/store/output/files/"
  75 #
  76 # 2) Set KBUILD_OUTPUT
  77 # Set the environment variable KBUILD_OUTPUT to point to the directory
  78 # where the output files shall be placed.
  79 # export KBUILD_OUTPUT=dir/to/store/output/files/
  80 # make
  81 #
  82 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  83 # variable.
  84
  85
  86 # KBUILD_SRC is set on invocation of make in OBJ directory
  87 # KBUILD_SRC is not intended to be used by the regular user (for now)
  88 ifeq ($(KBUILD_SRC),)
  89
  90 # OK, Make called in directory where kernel src resides
  91 # Do we want to locate output files in a separate directory?
  92 ifdef O
  93   ifeq ("$(origin O)", "command line")
  94     KBUILD_OUTPUT := $(O)
  95   endif
  96 endif
  97
  98 # That's our default target when none is given on the command line
  99 PHONY := _all
 100 _all:
 101
 102 ifneq ($(KBUILD_OUTPUT),)
 103 # Invoke a second make in the output directory, passing relevant variables
 104 # check that the output directory actually exists
 105 saved-output := $(KBUILD_OUTPUT)
 106 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 107 $(if $(KBUILD_OUTPUT),, \
 108      $(error output directory "$(saved-output)" does not exist))
 109
 110 PHONY += $(MAKECMDGOALS)
 111
 112 $(filter-out _all,$(MAKECMDGOALS)) _all:
 113         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 114         KBUILD_SRC=$(CURDIR) \
 115         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
 116
 117 # Leave processing to above invocation of make
 118 skip-makefile := 1
 119 endif # ifneq ($(KBUILD_OUTPUT),)
 120 endif # ifeq ($(KBUILD_SRC),)
 121
 122 # We process the rest of the Makefile if this is the final invocation of make
 123 ifeq ($(skip-makefile),)
 124
 125 # If building an external module we do not care about the all: rule
 126 # but instead _all depend on modules
 127 PHONY += all
 128 ifeq ($(KBUILD_EXTMOD),)
 129 _all: all
 130 else
 131 _all: modules
 132 endif
 133
 134 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 135 TOPDIR          := $(srctree)
 136 # FIXME - TOPDIR is obsolete, use srctree/objtree
 137 objtree         := $(CURDIR)
 138 src             := $(srctree)
 139 obj             := $(objtree)
 140
 141 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 142
 143 export srctree objtree VPATH TOPDIR
 144
 145
 146 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 147 # first, and if a usermode build is happening, the "ARCH=um" on the command
 148 # line overrides the setting of ARCH below.  If a native build is happening,
 149 # then ARCH is assigned, getting whatever value it gets normally, and
 150 # SUBARCH is subsequently ignored.
 151
 152 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 153                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 154                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 155                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
 156
 157 # Cross compiling and selecting different set of gcc/bin-utils
 158 # ---------------------------------------------------------------------------
 159 #
 160 # When performing cross compilation for other architectures ARCH shall be set
 161 # to the target architecture. (See arch/* for the possibilities).
 162 # ARCH can be set during invocation of make:
 163 # make ARCH=ia64
 164 # Another way is to have ARCH set in the environment.
 165 # The default ARCH is the host where make is executed.
 166
 167 # CROSS_COMPILE specify the prefix used for all executables used
 168 # during compilation. Only gcc and related bin-utils executables
 169 # are prefixed with $(CROSS_COMPILE).
 170 # CROSS_COMPILE can be set on the command line
 171 # make CROSS_COMPILE=ia64-linux-
 172 # Alternatively CROSS_COMPILE can be set in the environment.
 173 # Default value for CROSS_COMPILE is not to prefix executables
 174 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 175
 176 ARCH            ?= $(SUBARCH)
 177 CROSS_COMPILE   ?=
 178
 179 # Architecture as present in compile.h
 180 UTS_MACHINE := $(ARCH)
 181
 182 KCONFIG_CONFIG  ?= .config
 183
 184 # SHELL used by kbuild
 185 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 186           else if [ -x /bin/bash ]; then echo /bin/bash; \
 187           else echo sh; fi ; fi)
 188
 189 HOSTCC       = gcc
 190 HOSTCXX      = g++
 191 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 192 HOSTCXXFLAGS = -O2
 193
 194 # Decide whether to build built-in, modular, or both.
 195 # Normally, just do built-in.
 196
 197 KBUILD_MODULES :=
 198 KBUILD_BUILTIN := 1
 199
 200 #       If we have only "make modules", don't compile built-in objects.
 201 #       When we're building modules with modversions, we need to consider
 202 #       the built-in objects during the descend as well, in order to
 203 #       make sure the checksums are up to date before we record them.
 204
 205 ifeq ($(MAKECMDGOALS),modules)
 206   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 207 endif
 208
 209 #       If we have "make <whatever> modules", compile modules
 210 #       in addition to whatever we do anyway.
 211 #       Just "make" or "make all" shall build modules as well
 212
 213 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 214   KBUILD_MODULES := 1
 215 endif
 216
 217 ifeq ($(MAKECMDGOALS),)
 218   KBUILD_MODULES := 1
 219 endif
 220
 221 export KBUILD_MODULES KBUILD_BUILTIN
 222 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 223
 224 # Beautify output
 225 # ---------------------------------------------------------------------------
 226 #
 227 # Normally, we echo the whole command before executing it. By making
 228 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 229 # $(quiet) to choose other forms of output instead, e.g.
 230 #
 231 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 232 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 233 #
 234 # If $(quiet) is empty, the whole command will be printed.
 235 # If it is set to "quiet_", only the short version will be printed.
 236 # If it is set to "silent_", nothing will be printed at all, since
 237 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 238 #
 239 # A simple variant is to prefix commands with $(Q) - that's useful
 240 # for commands that shall be hidden in non-verbose mode.
 241 #
 242 #       $(Q)ln $@ :<
 243 #
 244 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 245 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 246
 247 ifeq ($(KBUILD_VERBOSE),1)
 248   quiet =
 249   Q =
 250 else
 251   quiet=quiet_
 252   Q = @
 253 endif
 254
 255 # If the user is running make -s (silent mode), suppress echoing of
 256 # commands
 257
 258 ifneq ($(findstring s,$(MAKEFLAGS)),)
 259   quiet=silent_
 260 endif
 261
 262 export quiet Q KBUILD_VERBOSE
 263
 264
 265 # Look for make include files relative to root of kernel src
 266 MAKEFLAGS += --include-dir=$(srctree)
 267
 268 # We need some generic definitions
 269 include  $(srctree)/scripts/Kbuild.include
 270
 271 # Do not use make's built-in rules and variables
 272 # This increases performance and avoid hard-to-debug behavour
 273 MAKEFLAGS += -rR
 274
 275 # Make variables (CC, etc...)
 276
 277 AS              = $(CROSS_COMPILE)as
 278 LD              = $(CROSS_COMPILE)ld
 279 CC              = $(CROSS_COMPILE)gcc
 280 CPP             = $(CC) -E
 281 AR              = $(CROSS_COMPILE)ar
 282 NM              = $(CROSS_COMPILE)nm
 283 STRIP           = $(CROSS_COMPILE)strip
 284 OBJCOPY         = $(CROSS_COMPILE)objcopy
 285 OBJDUMP         = $(CROSS_COMPILE)objdump
 286 AWK             = awk
 287 GENKSYMS        = scripts/genksyms/genksyms
 288 DEPMOD          = /sbin/depmod
 289 KALLSYMS        = scripts/kallsyms
 290 PERL            = perl
 291 CHECK           = sparse
 292
 293 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 294 MODFLAGS        = -DMODULE
 295 CFLAGS_MODULE   = $(MODFLAGS)
 296 AFLAGS_MODULE   = $(MODFLAGS)
 297 LDFLAGS_MODULE  = -r
 298 CFLAGS_KERNEL   =
 299 AFLAGS_KERNEL   =
 300
 301
 302 # Use LINUXINCLUDE when you must reference the include/ directory.
 303 # Needed to be compatible with the O= option
 304 LINUXINCLUDE    := -Iinclude \
 305                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 306                    -include include/linux/autoconf.h
 307
 308 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 309
 310 CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 311                    -fno-strict-aliasing -fno-common
 312 AFLAGS          := -D__ASSEMBLY__
 313
 314 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 315 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 316 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 317
 318 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 319 export ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 320 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 321 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 322
 323 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 324 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 325 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 326
 327 # When compiling out-of-tree modules, put MODVERDIR in the module
 328 # tree rather than in the kernel tree. The kernel tree might
 329 # even be read-only.
 330 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 331
 332 # Files to ignore in find ... statements
 333
 334 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
 335 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 336
 337 # ===========================================================================
 338 # Rules shared between *config targets and build targets
 339
 340 # Basic helpers built in scripts/
 341 PHONY += scripts_basic
 342 scripts_basic:
 343         $(Q)$(MAKE) $(build)=scripts/basic
 344
 345 # To avoid any implicit rule to kick in, define an empty command.
 346 scripts/basic/%: scripts_basic ;
 347
 348 PHONY += outputmakefile
 349 # outputmakefile generates a Makefile in the output directory, if using a
 350 # separate output directory. This allows convenient use of make in the
 351 # output directory.
 352 outputmakefile:
 353 ifneq ($(KBUILD_SRC),)
 354         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 355             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 356 endif
 357
 358 # To make sure we do not include .config for any of the *config targets
 359 # catch them early, and hand them over to scripts/kconfig/Makefile
 360 # It is allowed to specify more targets when calling make, including
 361 # mixing *config targets and build targets.
 362 # For example 'make oldconfig all'.
 363 # Detect when mixed targets is specified, and make a second invocation
 364 # of make so .config is not included in this case either (for *config).
 365
 366 no-dot-config-targets := clean mrproper distclean \
 367                          cscope TAGS tags help %docs check% \
 368                          kernelrelease kernelversion
 369
 370 config-targets := 0
 371 mixed-targets  := 0
 372 dot-config     := 1
 373
 374 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 375         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 376                 dot-config := 0
 377         endif
 378 endif
 379
 380 ifeq ($(KBUILD_EXTMOD),)
 381         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 382                 config-targets := 1
 383                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 384                         mixed-targets := 1
 385                 endif
 386         endif
 387 endif
 388
 389 ifeq ($(mixed-targets),1)
 390 # ===========================================================================
 391 # We're called with mixed targets (*config and build targets).
 392 # Handle them one by one.
 393
 394 %:: FORCE
 395         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 396
 397 else
 398 ifeq ($(config-targets),1)
 399 # ===========================================================================
 400 # *config targets only - make sure prerequisites are updated, and descend
 401 # in scripts/kconfig to make the *config target
 402
 403 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 404 # KBUILD_DEFCONFIG may point out an alternative default configuration
 405 # used for 'make defconfig'
 406 include $(srctree)/arch/$(ARCH)/Makefile
 407 export KBUILD_DEFCONFIG
 408
 409 config %config: scripts_basic outputmakefile FORCE
 410         $(Q)mkdir -p include/linux include/config
 411         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 412
 413 else
 414 # ===========================================================================
 415 # Build targets only - this includes vmlinux, arch specific targets, clean
 416 # targets and others. In general all targets except *config targets.
 417
 418 ifeq ($(KBUILD_EXTMOD),)
 419 # Additional helpers built in scripts/
 420 # Carefully list dependencies so we do not try to build scripts twice
 421 # in parallel
 422 PHONY += scripts
 423 scripts: scripts_basic include/config/auto.conf
 424         $(Q)$(MAKE) $(build)=$(@)
 425
 426 # Objects we will link into vmlinux / subdirs we need to visit
 427 init-y          := init/
 428 drivers-y       := drivers/ sound/
 429 net-y           := net/
 430 libs-y          := lib/
 431 core-y          := usr/
 432 endif # KBUILD_EXTMOD
 433
 434 ifeq ($(dot-config),1)
 435 # In this section, we need .config
 436
 437 # Read in dependencies to all Kconfig* files, make sure to run
 438 # oldconfig if changes are detected.
 439 -include include/config/auto.conf.cmd
 440 -include include/config/auto.conf
 441
 442 # To avoid any implicit rule to kick in, define an empty command
 443 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 444
 445 # If .config is newer than include/config/auto.conf, someone tinkered
 446 # with it and forgot to run make oldconfig.
 447 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 448 # we execute the config step to be sure to catch updated Kconfig files
 449 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 450 ifeq ($(KBUILD_EXTMOD),)
 451         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 452 else
 453         $(error kernel configuration not valid - run 'make prepare' in $(srctree) to update it)
 454 endif
 455
 456 else
 457 # Dummy target needed, because used as prerequisite
 458 include/config/auto.conf: ;
 459 endif
 460
 461 # The all: target is the default when no target is given on the
 462 # command line.
 463 # This allow a user to issue only 'make' to build a kernel including modules
 464 # Defaults vmlinux but it is usually overridden in the arch makefile
 465 all: vmlinux
 466
 467 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 468 CFLAGS          += -Os
 469 else
 470 CFLAGS          += -O2
 471 endif
 472
 473 ifdef CONFIG_FRAME_POINTER
 474 CFLAGS          += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 475 else
 476 CFLAGS          += -fomit-frame-pointer
 477 endif
 478
 479 ifdef CONFIG_UNWIND_INFO
 480 CFLAGS          += -fasynchronous-unwind-tables
 481 endif
 482
 483 ifdef CONFIG_DEBUG_INFO
 484 CFLAGS          += -g
 485 endif
 486
 487 include $(srctree)/arch/$(ARCH)/Makefile
 488
 489 # arch Makefile may override CC so keep this after arch Makefile is included
 490 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 491 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 492
 493 # warn about C99 declaration after statement
 494 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 495
 496 # disable pointer signed / unsigned warnings in gcc 4.0
 497 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 498
 499 # Default kernel image to build when no specific target is given.
 500 # KBUILD_IMAGE may be overruled on the command line or
 501 # set in the environment
 502 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 503 # this default value
 504 export KBUILD_IMAGE ?= vmlinux
 505
 506 #
 507 # INSTALL_PATH specifies where to place the updated kernel and system map
 508 # images. Default is /boot, but you can set it to other values
 509 export  INSTALL_PATH ?= /boot
 510
 511 #
 512 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 513 # relocations required by build roots.  This is not defined in the
 514 # makefile but the argument can be passed to make if needed.
 515 #
 516
 517 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 518 export MODLIB
 519
 520 #
 521 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 522 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 523 #  the default option --strip-debug will be used.  Otherwise,
 524 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 525
 526 ifdef INSTALL_MOD_STRIP
 527 ifeq ($(INSTALL_MOD_STRIP),1)
 528 mod_strip_cmd = $STRIP) --strip-debug
 529 else
 530 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 531 endif # INSTALL_MOD_STRIP=1
 532 else
 533 mod_strip_cmd = true
 534 endif # INSTALL_MOD_STRIP
 535 export mod_strip_cmd
 536
 537
 538 ifeq ($(KBUILD_EXTMOD),)
 539 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 540
 541 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 542                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 543                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 544
 545 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 546                      $(init-n) $(init-) \
 547                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 548                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 549
 550 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 551 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 552 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 553 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 554 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 555 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 556 libs-y          := $(libs-y1) $(libs-y2)
 557
 558 # Build vmlinux
 559 # ---------------------------------------------------------------------------
 560 # vmlinux is built from the objects selected by $(vmlinux-init) and
 561 # $(vmlinux-main). Most are built-in.o files from top-level directories
 562 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 563 # Ordering when linking is important, and $(vmlinux-init) must be first.
 564 #
 565 # vmlinux
 566 #   ^
 567 #   |
 568 #   +-< $(vmlinux-init)
 569 #   |   +--< init/version.o + more
 570 #   |
 571 #   +--< $(vmlinux-main)
 572 #   |    +--< driver/built-in.o mm/built-in.o + more
 573 #   |
 574 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 575 #
 576 # vmlinux version (uname -v) cannot be updated during normal
 577 # descending-into-subdirs phase since we do not yet know if we need to
 578 # update vmlinux.
 579 # Therefore this step is delayed until just before final link of vmlinux -
 580 # except in the kallsyms case where it is done just before adding the
 581 # symbols to the kernel.
 582 #
 583 # System.map is generated to document addresses of all kernel symbols
 584
 585 vmlinux-init := $(head-y) $(init-y)
 586 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 587 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 588 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 589
 590 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 591 # May be overridden by arch/$(ARCH)/Makefile
 592 quiet_cmd_vmlinux__ ?= LD      $@
 593       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 594       -T $(vmlinux-lds) $(vmlinux-init)                          \
 595       --start-group $(vmlinux-main) --end-group                  \
 596       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 597
 598 # Generate new vmlinux version
 599 quiet_cmd_vmlinux_version = GEN     .version
 600       cmd_vmlinux_version = set -e;                     \
 601         if [ ! -r .version ]; then                      \
 602           rm -f .version;                               \
 603           echo 1 >.version;                             \
 604         else                                            \
 605           mv .version .old_version;                     \
 606           expr 0$$(cat .old_version) + 1 >.version;     \
 607         fi;                                             \
 608         $(MAKE) $(build)=init
 609
 610 # Generate System.map
 611 quiet_cmd_sysmap = SYSMAP
 612       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 613
 614 # Link of vmlinux
 615 # If CONFIG_KALLSYMS is set .version is already updated
 616 # Generate System.map and verify that the content is consistent
 617 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 618 # First command is ':' to allow us to use + in front of the rule
 619 define rule_vmlinux__
 620         :
 621         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 622
 623         $(call cmd,vmlinux__)
 624         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 625
 626         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 627           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 628         $(cmd_sysmap) $@ System.map;                    \
 629         if [ $$? -ne 0 ]; then                          \
 630                 rm -f $@;                               \
 631                 /bin/false;                             \
 632         fi;
 633         $(verify_kallsyms)
 634 endef
 635
 636
 637 ifdef CONFIG_KALLSYMS
 638 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 639 # It's a three stage process:
 640 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 641 #   empty
 642 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 643 #   the right size - vmlinux version (uname -v) is updated during this step
 644 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 645 #   but due to the added section, some addresses have shifted.
 646 #   From here, we generate a correct .tmp_kallsyms2.o
 647 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 648 # o Verify that the System.map from vmlinux matches the map from
 649 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 650 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 651 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 652 #   temporary bypass to allow the kernel to be built while the
 653 #   maintainers work out what went wrong with kallsyms.
 654
 655 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 656 last_kallsyms := 3
 657 else
 658 last_kallsyms := 2
 659 endif
 660
 661 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 662
 663 define verify_kallsyms
 664         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 665           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 666           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 667         $(Q)cmp -s System.map .tmp_System.map ||              \
 668                 (echo Inconsistent kallsyms data;             \
 669                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 670                  rm .tmp_kallsyms* ; /bin/false )
 671 endef
 672
 673 # Update vmlinux version before link
 674 # Use + in front of this rule to silent warning about make -j1
 675 # First command is ':' to allow us to use + in front of this rule
 676 cmd_ksym_ld = $(cmd_vmlinux__)
 677 define rule_ksym_ld
 678         :
 679         +$(call cmd,vmlinux_version)
 680         $(call cmd,vmlinux__)
 681         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 682 endef
 683
 684 # Generate .S file with all kernel symbols
 685 quiet_cmd_kallsyms = KSYM    $@
 686       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 687                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 688
 689 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 690         $(call if_changed_dep,as_o_S)
 691
 692 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 693         $(call cmd,kallsyms)
 694
 695 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 696 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 697         $(call if_changed_rule,ksym_ld)
 698
 699 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 700         $(call if_changed,vmlinux__)
 701
 702 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 703         $(call if_changed,vmlinux__)
 704
 705 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 706 $(KALLSYMS): scripts ;
 707
 708 # Generate some data for debugging strange kallsyms problems
 709 debug_kallsyms: .tmp_map$(last_kallsyms)
 710
 711 .tmp_map%: .tmp_vmlinux% FORCE
 712         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 713
 714 .tmp_map3: .tmp_map2
 715
 716 .tmp_map2: .tmp_map1
 717
 718 endif # ifdef CONFIG_KALLSYMS
 719
 720 # vmlinux image - including updated kernel symbols
 721 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 722         $(call if_changed_rule,vmlinux__)
 723         $(Q)rm -f .old_version
 724
 725 # The actual objects are generated when descending,
 726 # make sure no implicit rule kicks in
 727 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 728
 729 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 730 # Preset locale variables to speed up the build process. Limit locale
 731 # tweaks to this spot to avoid wrong language settings when running
 732 # make menuconfig etc.
 733 # Error messages still appears in the original language
 734
 735 PHONY += $(vmlinux-dirs)
 736 $(vmlinux-dirs): prepare scripts
 737         $(Q)$(MAKE) $(build)=$@
 738
 739 # Build the kernel release string
 740 # The KERNELRELEASE is stored in a file named include/config/kernel.release
 741 # to be used when executing for example make install or make modules_install
 742 #
 743 # Take the contents of any files called localversion* and the config
 744 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
 745 # LOCALVERSION from the command line override all of this
 746
 747 nullstring :=
 748 space      := $(nullstring) # end of line
 749
 750 ___localver = $(objtree)/localversion* $(srctree)/localversion*
 751 __localver  = $(sort $(wildcard $(___localver)))
 752 # skip backup files (containing '~')
 753 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
 754
 755 localver = $(subst $(space),, \
 756            $(shell cat /dev/null $(_localver)) \
 757            $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 758
 759 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 760 # and if the SCM is know a tag from the SCM is appended.
 761 # The appended tag is determined by the SCM used.
 762 #
 763 # Currently, only git is supported.
 764 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 765 # checks as needed.
 766 ifdef CONFIG_LOCALVERSION_AUTO
 767         _localver-auto = $(shell $(CONFIG_SHELL) \
 768                           $(srctree)/scripts/setlocalversion $(srctree))
 769         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 770 endif
 771
 772 localver-full = $(localver)$(localver-auto)
 773
 774 # Store (new) KERNELRELASE string in include/config/kernel.release
 775 kernelrelease = $(KERNELVERSION)$(localver-full)
 776 include/config/kernel.release: include/config/auto.conf FORCE
 777         $(Q)rm -f $@
 778         $(Q)echo $(kernelrelease) > $@
 779
 780
 781 # Things we need to do before we recursively start building the kernel
 782 # or the modules are listed in "prepare".
 783 # A multi level approach is used. prepareN is processed before prepareN-1.
 784 # archprepare is used in arch Makefiles and when processed asm symlink,
 785 # version.h and scripts_basic is processed / created.
 786
 787 # Listed in dependency order
 788 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 789
 790 # prepare-all is deprecated, use prepare as valid replacement
 791 PHONY += prepare-all
 792
 793 # prepare3 is used to check if we are building in a separate output directory,
 794 # and if so do:
 795 # 1) Check that make has not been executed in the kernel src $(srctree)
 796 # 2) Create the include2 directory, used for the second asm symlink
 797 prepare3: include/config/kernel.release
 798 ifneq ($(KBUILD_SRC),)
 799         @echo '  Using $(srctree) as source for kernel'
 800         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 801                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 802                 echo "  in the '$(srctree)' directory.";\
 803                 /bin/false; \
 804         fi;
 805         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 806         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 807 endif
 808
 809 # prepare2 creates a makefile if using a separate output directory
 810 prepare2: prepare3 outputmakefile
 811
 812 prepare1: prepare2 include/linux/version.h include/asm \
 813                    include/config/auto.conf
 814 ifneq ($(KBUILD_MODULES),)
 815         $(Q)mkdir -p $(MODVERDIR)
 816         $(Q)rm -f $(MODVERDIR)/*
 817 endif
 818
 819 archprepare: prepare1 scripts_basic
 820
 821 prepare0: archprepare FORCE
 822         $(Q)$(MAKE) $(build)=.
 823
 824 # All the preparing..
 825 prepare prepare-all: prepare0
 826
 827 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 828 # done in arch/$(ARCH)/kernel/Makefile
 829
 830 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 831
 832 # FIXME: The asm symlink changes when $(ARCH) changes. That's
 833 # hard to detect, but I suppose "make mrproper" is a good idea
 834 # before switching between archs anyway.
 835
 836 include/asm:
 837         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 838         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 839         @ln -fsn asm-$(ARCH) $@
 840
 841 # Generate some files
 842 # ---------------------------------------------------------------------------
 843
 844 # KERNELRELEASE can change from a few different places, meaning version.h
 845 # needs to be updated, so this check is forced on all builds
 846
 847 uts_len := 64
 848
 849 define filechk_version.h
 850         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 851           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 852           exit 1; \
 853         fi; \
 854         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 855           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 856          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 857         )
 858 endef
 859
 860 include/linux/version.h: $(srctree)/Makefile include/config/kernel.release FORCE
 861         $(call filechk,version.h)
 862
 863 # ---------------------------------------------------------------------------
 864
 865 PHONY += depend dep
 866 depend dep:
 867         @echo '*** Warning: make $@ is unnecessary now.'
 868
 869 # ---------------------------------------------------------------------------
 870 # Modules
 871
 872 ifdef CONFIG_MODULES
 873
 874 # By default, build modules as well
 875
 876 all: modules
 877
 878 #       Build modules
 879
 880 PHONY += modules
 881 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 882         @echo '  Building modules, stage 2.';
 883         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 884
 885
 886 # Target to prepare building external modules
 887 PHONY += modules_prepare
 888 modules_prepare: prepare scripts
 889
 890 # Target to install modules
 891 PHONY += modules_install
 892 modules_install: _modinst_ _modinst_post
 893
 894 PHONY += _modinst_
 895 _modinst_:
 896         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 897                 echo "Warning: you may need to install module-init-tools"; \
 898                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 899                 sleep 1; \
 900         fi
 901         @rm -rf $(MODLIB)/kernel
 902         @rm -f $(MODLIB)/source
 903         @mkdir -p $(MODLIB)/kernel
 904         @ln -s $(srctree) $(MODLIB)/source
 905         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 906                 rm -f $(MODLIB)/build ; \
 907                 ln -s $(objtree) $(MODLIB)/build ; \
 908         fi
 909         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 910
 911 # If System.map exists, run depmod.  This deliberately does not have a
 912 # dependency on System.map since that would run the dependency tree on
 913 # vmlinux.  This depmod is only for convenience to give the initial
 914 # boot a modules.dep even before / is mounted read-write.  However the
 915 # boot script depmod is the master version.
 916 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 917 depmod_opts     :=
 918 else
 919 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 920 endif
 921 PHONY += _modinst_post
 922 _modinst_post: _modinst_
 923         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 924
 925 else # CONFIG_MODULES
 926
 927 # Modules not configured
 928 # ---------------------------------------------------------------------------
 929
 930 modules modules_install: FORCE
 931         @echo
 932         @echo "The present kernel configuration has modules disabled."
 933         @echo "Type 'make config' and enable loadable module support."
 934         @echo "Then build a kernel with module support enabled."
 935         @echo
 936         @exit 1
 937
 938 endif # CONFIG_MODULES
 939
 940 ###
 941 # Cleaning is done on three levels.
 942 # make clean     Delete most generated files
 943 #                Leave enough to build external modules
 944 # make mrproper  Delete the current configuration, and all generated files
 945 # make distclean Remove editor backup files, patch leftover files and the like
 946
 947 # Directories & files removed with 'make clean'
 948 CLEAN_DIRS  += $(MODVERDIR)
 949 CLEAN_FILES +=  vmlinux System.map \
 950                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 951
 952 # Directories & files removed with 'make mrproper'
 953 MRPROPER_DIRS  += include/config include2
 954 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
 955                   include/linux/autoconf.h include/linux/version.h \
 956                   Module.symvers tags TAGS cscope*
 957
 958 # clean - Delete most, but leave enough to build external modules
 959 #
 960 clean: rm-dirs  := $(CLEAN_DIRS)
 961 clean: rm-files := $(CLEAN_FILES)
 962 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
 963
 964 PHONY += $(clean-dirs) clean archclean
 965 $(clean-dirs):
 966         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 967
 968 clean: archclean $(clean-dirs)
 969         $(call cmd,rmdirs)
 970         $(call cmd,rmfiles)
 971         @find . $(RCS_FIND_IGNORE) \
 972                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 973                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
 974                 -o -name '*.symtypes' \) \
 975                 -type f -print | xargs rm -f
 976
 977 # mrproper - Delete all generated files, including .config
 978 #
 979 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 980 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 981 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
 982
 983 PHONY += $(mrproper-dirs) mrproper archmrproper
 984 $(mrproper-dirs):
 985         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 986
 987 mrproper: clean archmrproper $(mrproper-dirs)
 988         $(call cmd,rmdirs)
 989         $(call cmd,rmfiles)
 990
 991 # distclean
 992 #
 993 PHONY += distclean
 994
 995 distclean: mrproper
 996         @find $(srctree) $(RCS_FIND_IGNORE) \
 997                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 998                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 999                 -o -name '.*.rej' -o -size 0 \
1000                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1001                 -type f -print | xargs rm -f
1002
1003
1004 # Packaging of the kernel to various formats
1005 # ---------------------------------------------------------------------------
1006 # rpm target kept for backward compatibility
1007 package-dir     := $(srctree)/scripts/package
1008
1009 %pkg: include/config/kernel.release FORCE
1010         $(Q)$(MAKE) $(build)=$(package-dir) $@
1011 rpm: include/config/kernel.release FORCE
1012         $(Q)$(MAKE) $(build)=$(package-dir) $@
1013
1014
1015 # Brief documentation of the typical targets used
1016 # ---------------------------------------------------------------------------
1017
1018 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1019 boards := $(notdir $(boards))
1020
1021 help:
1022         @echo  'Cleaning targets:'
1023         @echo  '  clean           - remove most generated files but keep the config'
1024         @echo  '  mrproper        - remove all generated files + config + various backup files'
1025         @echo  ''
1026         @echo  'Configuration targets:'
1027         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1028         @echo  ''
1029         @echo  'Other generic targets:'
1030         @echo  '  all             - Build all targets marked with [*]'
1031         @echo  '* vmlinux         - Build the bare kernel'
1032         @echo  '* modules         - Build all modules'
1033         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1034         @echo  '  dir/            - Build all files in dir and below'
1035         @echo  '  dir/file.[ois]  - Build specified target only'
1036         @echo  '  dir/file.ko     - Build module including final link'
1037         @echo  '  rpm             - Build a kernel as an RPM package'
1038         @echo  '  tags/TAGS       - Generate tags file for editors'
1039         @echo  '  cscope          - Generate cscope index'
1040         @echo  '  kernelrelease   - Output the release version string'
1041         @echo  '  kernelversion   - Output the version stored in Makefile'
1042         @echo  ''
1043         @echo  'Static analysers'
1044         @echo  '  checkstack      - Generate a list of stack hogs'
1045         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1046         @echo  ''
1047         @echo  'Kernel packaging:'
1048         @$(MAKE) $(build)=$(package-dir) help
1049         @echo  ''
1050         @echo  'Documentation targets:'
1051         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1052         @echo  ''
1053         @echo  'Architecture specific targets ($(ARCH)):'
1054         @$(if $(archhelp),$(archhelp),\
1055                 echo '  No architecture specific help defined for $(ARCH)')
1056         @echo  ''
1057         @$(if $(boards), \
1058                 $(foreach b, $(boards), \
1059                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1060                 echo '')
1061
1062         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1063         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1064         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1065         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1066         @echo  ''
1067         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1068         @echo  'For further info see the ./README file'
1069
1070
1071 # Documentation targets
1072 # ---------------------------------------------------------------------------
1073 %docs: scripts_basic FORCE
1074         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1075
1076 else # KBUILD_EXTMOD
1077
1078 ###
1079 # External module support.
1080 # When building external modules the kernel used as basis is considered
1081 # read-only, and no consistency checks are made and the make
1082 # system is not used on the basis kernel. If updates are required
1083 # in the basis kernel ordinary make commands (without M=...) must
1084 # be used.
1085 #
1086 # The following are the only valid targets when building external
1087 # modules.
1088 # make M=dir clean     Delete all automatically generated files
1089 # make M=dir modules   Make all modules in specified dir
1090 # make M=dir           Same as 'make M=dir modules'
1091 # make M=dir modules_install
1092 #                      Install the modules built in the module directory
1093 #                      Assumes install directory is already created
1094
1095 # We are always building modules
1096 KBUILD_MODULES := 1
1097 PHONY += crmodverdir
1098 crmodverdir:
1099         $(Q)mkdir -p $(MODVERDIR)
1100         $(Q)rm -f $(MODVERDIR)/*
1101
1102 PHONY += $(objtree)/Module.symvers
1103 $(objtree)/Module.symvers:
1104         @test -e $(objtree)/Module.symvers || ( \
1105         echo; \
1106         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1107         echo "           is missing; modules will have no dependencies and modversions."; \
1108         echo )
1109
1110 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1111 PHONY += $(module-dirs) modules
1112 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1113         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1114
1115 modules: $(module-dirs)
1116         @echo '  Building modules, stage 2.';
1117         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1118
1119 PHONY += modules_install
1120 modules_install: _emodinst_ _emodinst_post
1121
1122 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1123 PHONY += _emodinst_
1124 _emodinst_:
1125         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1126         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1127
1128 # Run depmod only is we have System.map and depmod is executable
1129 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1130       cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1131                       $(DEPMOD) -ae -F System.map             \
1132                       $(if $(strip $(INSTALL_MOD_PATH)),      \
1133                       -b $(INSTALL_MOD_PATH) -r)              \
1134                       $(KERNELRELEASE);                       \
1135                    fi
1136
1137 PHONY += _emodinst_post
1138 _emodinst_post: _emodinst_
1139         $(call cmd,depmod)
1140
1141 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1142
1143 PHONY += $(clean-dirs) clean
1144 $(clean-dirs):
1145         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1146
1147 clean:  rm-dirs := $(MODVERDIR)
1148 clean: $(clean-dirs)
1149         $(call cmd,rmdirs)
1150         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1151                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1152                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1153                 -type f -print | xargs rm -f
1154
1155 help:
1156         @echo  '  Building external modules.'
1157         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1158         @echo  ''
1159         @echo  '  modules         - default target, build the module(s)'
1160         @echo  '  modules_install - install the module'
1161         @echo  '  clean           - remove generated files in module directory only'
1162         @echo  ''
1163
1164 # Dummies...
1165 PHONY += prepare scripts
1166 prepare: ;
1167 scripts: ;
1168 endif # KBUILD_EXTMOD
1169
1170 # Generate tags for editors
1171 # ---------------------------------------------------------------------------
1172
1173 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1174 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1175 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1176
1177 ifeq ($(src),$(obj))
1178 __srctree =
1179 else
1180 __srctree = $(srctree)/
1181 endif
1182
1183 ifeq ($(ALLSOURCE_ARCHS),)
1184 ifeq ($(ARCH),um)
1185 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1186 else
1187 ALLINCLUDE_ARCHS := $(ARCH)
1188 endif
1189 else
1190 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1191 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1192 endif
1193
1194 ALLSOURCE_ARCHS := $(ARCH)
1195
1196 define find-sources
1197         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1198                \( -name include -o -name arch \) -prune -o \
1199                -name $1 -print; \
1200           for ARCH in $(ALLSOURCE_ARCHS) ; do \
1201                find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1202                     -name $1 -print; \
1203           done ; \
1204           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1205                -name $1 -print; \
1206           find $(__srctree)include $(RCS_FIND_IGNORE) \
1207                \( -name config -o -name 'asm-*' \) -prune \
1208                -o -name $1 -print; \
1209           for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1210                find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1211                     -name $1 -print; \
1212           done ; \
1213           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1214                -name $1 -print )
1215 endef
1216
1217 define all-sources
1218         $(call find-sources,'*.[chS]')
1219 endef
1220 define all-kconfigs
1221         $(call find-sources,'Kconfig*')
1222 endef
1223 define all-defconfigs
1224         $(call find-sources,'defconfig')
1225 endef
1226
1227 quiet_cmd_cscope-file = FILELST cscope.files
1228       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1229
1230 quiet_cmd_cscope = MAKE    cscope.out
1231       cmd_cscope = cscope -b
1232
1233 cscope: FORCE
1234         $(call cmd,cscope-file)
1235         $(call cmd,cscope)
1236
1237 quiet_cmd_TAGS = MAKE   $@
1238 define cmd_TAGS
1239         rm -f $@; \
1240         ETAGSF=`etags --version | grep -i exuberant >/dev/null &&     \
1241                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1242                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1243                       --extra=+f --c-kinds=+px"`;                     \
1244                 $(all-sources) | xargs etags $$ETAGSF -a;             \
1245         if test "x$$ETAGSF" = x; then                                 \
1246                 $(all-kconfigs) | xargs etags -a                      \
1247                 --regex='/^config[ \t]+\([a-zA-Z0-9_]+\)/\1/';        \
1248                 $(all-defconfigs) | xargs etags -a                    \
1249                 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/';     \
1250         fi
1251 endef
1252
1253 TAGS: FORCE
1254         $(call cmd,TAGS)
1255
1256
1257 quiet_cmd_tags = MAKE   $@
1258 define cmd_tags
1259         rm -f $@; \
1260         CTAGSF=`ctags --version | grep -i exuberant >/dev/null &&     \
1261                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1262                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1263                       --extra=+f --c-kinds=+px"`;                     \
1264                 $(all-sources) | xargs ctags $$CTAGSF -a
1265 endef
1266
1267 tags: FORCE
1268         $(call cmd,tags)
1269
1270
1271 # Scripts to check various things for consistency
1272 # ---------------------------------------------------------------------------
1273
1274 includecheck:
1275         find * $(RCS_FIND_IGNORE) \
1276                 -name '*.[hcS]' -type f -print | sort \
1277                 | xargs $(PERL) -w scripts/checkincludes.pl
1278
1279 versioncheck:
1280         find * $(RCS_FIND_IGNORE) \
1281                 -name '*.[hcS]' -type f -print | sort \
1282                 | xargs $(PERL) -w scripts/checkversion.pl
1283
1284 namespacecheck:
1285         $(PERL) $(srctree)/scripts/namespace.pl
1286
1287 endif #ifeq ($(config-targets),1)
1288 endif #ifeq ($(mixed-targets),1)
1289
1290 PHONY += checkstack kernelrelease kernelversion
1291 checkstack:
1292         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1293         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1294
1295 kernelrelease:
1296         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1297         $(error kernelrelease not valid - run 'make prepare' to update it))
1298 kernelversion:
1299         @echo $(KERNELVERSION)
1300
1301 # Single targets
1302 # ---------------------------------------------------------------------------
1303 # Single targets are compatible with:
1304 # - build whith mixed source and output
1305 # - build with separate output dir 'make O=...'
1306 # - external modules
1307 #
1308 #  target-dir => where to store outputfile
1309 #  build-dir  => directory in kernel source tree to use
1310
1311 ifeq ($(KBUILD_EXTMOD),)
1312         build-dir  = $(patsubst %/,%,$(dir $@))
1313         target-dir = $(dir $@)
1314 else
1315         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1316         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1317         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1318 endif
1319
1320 %.s: %.c prepare scripts FORCE
1321         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1322 %.i: %.c prepare scripts FORCE
1323         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1324 %.o: %.c prepare scripts FORCE
1325         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1326 %.lst: %.c prepare scripts FORCE
1327         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1328 %.s: %.S prepare scripts FORCE
1329         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1330 %.o: %.S prepare scripts FORCE
1331         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1332 %.symtypes: %.c prepare scripts FORCE
1333         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1334
1335 # Modules
1336 / %/: prepare scripts FORCE
1337         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1338         $(build)=$(build-dir)
1339 %.ko: prepare scripts FORCE
1340         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1341         $(build)=$(build-dir) $(@:.ko=.o)
1342         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1343
1344 # FIXME Should go into a make.lib or something
1345 # ===========================================================================
1346
1347 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1348       cmd_rmdirs = rm -rf $(rm-dirs)
1349
1350 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1351       cmd_rmfiles = rm -f $(rm-files)
1352
1353
1354 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1355           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1356           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1357
1358 quiet_cmd_as_o_S = AS      $@
1359 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1360
1361 # read all saved command lines
1362
1363 targets := $(wildcard $(sort $(targets)))
1364 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1365
1366 ifneq ($(cmd_files),)
1367   $(cmd_files): ;       # Do not try to update included dependency files
1368   include $(cmd_files)
1369 endif
1370
1371 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1372 # Usage:
1373 # $(Q)$(MAKE) $(clean)=dir
1374 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1375
1376 endif   # skip-makefile
1377
1378 PHONY += FORCE
1379 FORCE:
1380
1381
1382 # Declare the contents of the .PHONY variable as phony.  We keep that
1383 # information in a variable se we can use it in if_changed and friends.
1384 .PHONY: $(PHONY)