Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 23
   4 EXTRAVERSION =
   5 NAME = Arr Matey! A Hairy Bilge Rat!
   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:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoid hard-to-debug behavour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # We are using a recursive build, so we need to do a little thinking
  20 # to get the ordering right.
  21 #
  22 # Most importantly: sub-Makefiles should only ever modify files in
  23 # their own directory. If in some directory we have a dependency on
  24 # a file in another dir (which doesn't happen often, but it's often
  25 # unavoidable when linking the built-in.o targets which finally
  26 # turn into vmlinux), we will call a sub make in that other dir, and
  27 # after that we are sure that everything which is in that other dir
  28 # is now up to date.
  29 #
  30 # The only cases where we need to modify files which have global
  31 # effects are thus separated out and done before the recursive
  32 # descending is started. They are now explicitly listed as the
  33 # prepare rule.
  34
  35 # To put more focus on warnings, be less verbose as default
  36 # Use 'make V=1' to see the full commands
  37
  38 ifdef V
  39   ifeq ("$(origin V)", "command line")
  40     KBUILD_VERBOSE = $(V)
  41   endif
  42 endif
  43 ifndef KBUILD_VERBOSE
  44   KBUILD_VERBOSE = 0
  45 endif
  46
  47 # Call a source code checker (by default, "sparse") as part of the
  48 # C compilation.
  49 #
  50 # Use 'make C=1' to enable checking of only re-compiled files.
  51 # Use 'make C=2' to enable checking of *all* source files, regardless
  52 # of whether they are re-compiled or not.
  53 #
  54 # See the file "Documentation/sparse.txt" for more details, including
  55 # where to get the "sparse" utility.
  56
  57 ifdef C
  58   ifeq ("$(origin C)", "command line")
  59     KBUILD_CHECKSRC = $(C)
  60   endif
  61 endif
  62 ifndef KBUILD_CHECKSRC
  63   KBUILD_CHECKSRC = 0
  64 endif
  65
  66 # Use make M=dir to specify directory of external module to build
  67 # Old syntax make ... SUBDIRS=$PWD is still supported
  68 # Setting the environment variable KBUILD_EXTMOD take precedence
  69 ifdef SUBDIRS
  70   KBUILD_EXTMOD ?= $(SUBDIRS)
  71 endif
  72 ifdef M
  73   ifeq ("$(origin M)", "command line")
  74     KBUILD_EXTMOD := $(M)
  75   endif
  76 endif
  77
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(KBUILD_SRC),)
  98
  99 # OK, Make called in directory where kernel src resides
 100 # Do we want to locate output files in a separate directory?
 101 ifdef O
 102   ifeq ("$(origin O)", "command line")
 103     KBUILD_OUTPUT := $(O)
 104   endif
 105 endif
 106
 107 # That's our default target when none is given on the command line
 108 PHONY := _all
 109 _all:
 110
 111 ifneq ($(KBUILD_OUTPUT),)
 112 # Invoke a second make in the output directory, passing relevant variables
 113 # check that the output directory actually exists
 114 saved-output := $(KBUILD_OUTPUT)
 115 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 116 $(if $(KBUILD_OUTPUT),, \
 117      $(error output directory "$(saved-output)" does not exist))
 118 # Check that OUTPUT directory is not the same as where we have kernel src
 119 $(if $(filter-out $(KBUILD_OUTPUT),$(shell /bin/pwd)),, \
 120      $(error Output directory (O=...) specifies kernel src dir))
 121
 122 PHONY += $(MAKECMDGOALS) sub-make
 123
 124 $(filter-out _all sub-make,$(MAKECMDGOALS)) _all: sub-make
 125         $(Q)@:
 126
 127 sub-make: FORCE
 128         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 129         KBUILD_SRC=$(CURDIR) \
 130         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 131         $(filter-out _all sub-make,$(MAKECMDGOALS))
 132
 133 # Leave processing to above invocation of make
 134 skip-makefile := 1
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136 endif # ifeq ($(KBUILD_SRC),)
 137
 138 # We process the rest of the Makefile if this is the final invocation of make
 139 ifeq ($(skip-makefile),)
 140
 141 # If building an external module we do not care about the all: rule
 142 # but instead _all depend on modules
 143 PHONY += all
 144 ifeq ($(KBUILD_EXTMOD),)
 145 _all: all
 146 else
 147 _all: modules
 148 endif
 149
 150 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 151 TOPDIR          := $(srctree)
 152 # FIXME - TOPDIR is obsolete, use srctree/objtree
 153 objtree         := $(CURDIR)
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH TOPDIR
 160
 161
 162 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 163 # first, and if a usermode build is happening, the "ARCH=um" on the command
 164 # line overrides the setting of ARCH below.  If a native build is happening,
 165 # then ARCH is assigned, getting whatever value it gets normally, and
 166 # SUBARCH is subsequently ignored.
 167
 168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
 172
 173 # Cross compiling and selecting different set of gcc/bin-utils
 174 # ---------------------------------------------------------------------------
 175 #
 176 # When performing cross compilation for other architectures ARCH shall be set
 177 # to the target architecture. (See arch/* for the possibilities).
 178 # ARCH can be set during invocation of make:
 179 # make ARCH=ia64
 180 # Another way is to have ARCH set in the environment.
 181 # The default ARCH is the host where make is executed.
 182
 183 # CROSS_COMPILE specify the prefix used for all executables used
 184 # during compilation. Only gcc and related bin-utils executables
 185 # are prefixed with $(CROSS_COMPILE).
 186 # CROSS_COMPILE can be set on the command line
 187 # make CROSS_COMPILE=ia64-linux-
 188 # Alternatively CROSS_COMPILE can be set in the environment.
 189 # Default value for CROSS_COMPILE is not to prefix executables
 190 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 191
 192 ARCH            ?= $(SUBARCH)
 193 CROSS_COMPILE   ?=
 194
 195 # Architecture as present in compile.h
 196 UTS_MACHINE     := $(ARCH)
 197 SRCARCH         := $(ARCH)
 198
 199 KCONFIG_CONFIG  ?= .config
 200
 201 # SHELL used by kbuild
 202 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 203           else if [ -x /bin/bash ]; then echo /bin/bash; \
 204           else echo sh; fi ; fi)
 205
 206 HOSTCC       = gcc
 207 HOSTCXX      = g++
 208 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 209 HOSTCXXFLAGS = -O2
 210
 211 # Decide whether to build built-in, modular, or both.
 212 # Normally, just do built-in.
 213
 214 KBUILD_MODULES :=
 215 KBUILD_BUILTIN := 1
 216
 217 #       If we have only "make modules", don't compile built-in objects.
 218 #       When we're building modules with modversions, we need to consider
 219 #       the built-in objects during the descend as well, in order to
 220 #       make sure the checksums are up to date before we record them.
 221
 222 ifeq ($(MAKECMDGOALS),modules)
 223   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 224 endif
 225
 226 #       If we have "make <whatever> modules", compile modules
 227 #       in addition to whatever we do anyway.
 228 #       Just "make" or "make all" shall build modules as well
 229
 230 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 231   KBUILD_MODULES := 1
 232 endif
 233
 234 ifeq ($(MAKECMDGOALS),)
 235   KBUILD_MODULES := 1
 236 endif
 237
 238 export KBUILD_MODULES KBUILD_BUILTIN
 239 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 240
 241 # Beautify output
 242 # ---------------------------------------------------------------------------
 243 #
 244 # Normally, we echo the whole command before executing it. By making
 245 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 246 # $(quiet) to choose other forms of output instead, e.g.
 247 #
 248 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 249 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 250 #
 251 # If $(quiet) is empty, the whole command will be printed.
 252 # If it is set to "quiet_", only the short version will be printed.
 253 # If it is set to "silent_", nothing will be printed at all, since
 254 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 255 #
 256 # A simple variant is to prefix commands with $(Q) - that's useful
 257 # for commands that shall be hidden in non-verbose mode.
 258 #
 259 #       $(Q)ln $@ :<
 260 #
 261 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 262 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 263
 264 ifeq ($(KBUILD_VERBOSE),1)
 265   quiet =
 266   Q =
 267 else
 268   quiet=quiet_
 269   Q = @
 270 endif
 271
 272 # If the user is running make -s (silent mode), suppress echoing of
 273 # commands
 274
 275 ifneq ($(findstring s,$(MAKEFLAGS)),)
 276   quiet=silent_
 277 endif
 278
 279 export quiet Q KBUILD_VERBOSE
 280
 281
 282 # Look for make include files relative to root of kernel src
 283 MAKEFLAGS += --include-dir=$(srctree)
 284
 285 # We need some generic definitions.
 286 include $(srctree)/scripts/Kbuild.include
 287
 288 # Make variables (CC, etc...)
 289
 290 AS              = $(CROSS_COMPILE)as
 291 LD              = $(CROSS_COMPILE)ld
 292 CC              = $(CROSS_COMPILE)gcc
 293 CPP             = $(CC) -E
 294 AR              = $(CROSS_COMPILE)ar
 295 NM              = $(CROSS_COMPILE)nm
 296 STRIP           = $(CROSS_COMPILE)strip
 297 OBJCOPY         = $(CROSS_COMPILE)objcopy
 298 OBJDUMP         = $(CROSS_COMPILE)objdump
 299 AWK             = awk
 300 GENKSYMS        = scripts/genksyms/genksyms
 301 DEPMOD          = /sbin/depmod
 302 KALLSYMS        = scripts/kallsyms
 303 PERL            = perl
 304 CHECK           = sparse
 305
 306 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 307 MODFLAGS        = -DMODULE
 308 CFLAGS_MODULE   = $(MODFLAGS)
 309 AFLAGS_MODULE   = $(MODFLAGS)
 310 LDFLAGS_MODULE  =
 311 CFLAGS_KERNEL   =
 312 AFLAGS_KERNEL   =
 313
 314
 315 # Use LINUXINCLUDE when you must reference the include/ directory.
 316 # Needed to be compatible with the O= option
 317 LINUXINCLUDE    := -Iinclude \
 318                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 319                    -include include/linux/autoconf.h
 320
 321 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
 322
 323 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 324                    -fno-strict-aliasing -fno-common \
 325                    -Werror-implicit-function-declaration
 326 KBUILD_AFLAGS   := -D__ASSEMBLY__
 327
 328 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 329 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 330 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 331
 332 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 333 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 334 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 335 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 336
 337 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 338 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 339 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 340
 341 # When compiling out-of-tree modules, put MODVERDIR in the module
 342 # tree rather than in the kernel tree. The kernel tree might
 343 # even be read-only.
 344 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 345
 346 # Files to ignore in find ... statements
 347
 348 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
 349 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 350
 351 # ===========================================================================
 352 # Rules shared between *config targets and build targets
 353
 354 # Basic helpers built in scripts/
 355 PHONY += scripts_basic
 356 scripts_basic:
 357         $(Q)$(MAKE) $(build)=scripts/basic
 358
 359 # To avoid any implicit rule to kick in, define an empty command.
 360 scripts/basic/%: scripts_basic ;
 361
 362 PHONY += outputmakefile
 363 # outputmakefile generates a Makefile in the output directory, if using a
 364 # separate output directory. This allows convenient use of make in the
 365 # output directory.
 366 outputmakefile:
 367 ifneq ($(KBUILD_SRC),)
 368         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 369             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 370 endif
 371
 372 # To make sure we do not include .config for any of the *config targets
 373 # catch them early, and hand them over to scripts/kconfig/Makefile
 374 # It is allowed to specify more targets when calling make, including
 375 # mixing *config targets and build targets.
 376 # For example 'make oldconfig all'.
 377 # Detect when mixed targets is specified, and make a second invocation
 378 # of make so .config is not included in this case either (for *config).
 379
 380 no-dot-config-targets := clean mrproper distclean \
 381                          cscope TAGS tags help %docs check% \
 382                          include/linux/version.h headers_% \
 383                          kernelrelease kernelversion
 384
 385 config-targets := 0
 386 mixed-targets  := 0
 387 dot-config     := 1
 388
 389 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 390         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 391                 dot-config := 0
 392         endif
 393 endif
 394
 395 ifeq ($(KBUILD_EXTMOD),)
 396         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 397                 config-targets := 1
 398                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 399                         mixed-targets := 1
 400                 endif
 401         endif
 402 endif
 403
 404 ifeq ($(mixed-targets),1)
 405 # ===========================================================================
 406 # We're called with mixed targets (*config and build targets).
 407 # Handle them one by one.
 408
 409 %:: FORCE
 410         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 411
 412 else
 413 ifeq ($(config-targets),1)
 414 # ===========================================================================
 415 # *config targets only - make sure prerequisites are updated, and descend
 416 # in scripts/kconfig to make the *config target
 417
 418 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 419 # KBUILD_DEFCONFIG may point out an alternative default configuration
 420 # used for 'make defconfig'
 421 include $(srctree)/arch/$(ARCH)/Makefile
 422 export KBUILD_DEFCONFIG
 423
 424 config %config: scripts_basic outputmakefile FORCE
 425         $(Q)mkdir -p include/linux include/config
 426         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 427
 428 else
 429 # ===========================================================================
 430 # Build targets only - this includes vmlinux, arch specific targets, clean
 431 # targets and others. In general all targets except *config targets.
 432
 433 ifeq ($(KBUILD_EXTMOD),)
 434 # Additional helpers built in scripts/
 435 # Carefully list dependencies so we do not try to build scripts twice
 436 # in parallel
 437 PHONY += scripts
 438 scripts: scripts_basic include/config/auto.conf
 439         $(Q)$(MAKE) $(build)=$(@)
 440
 441 # Objects we will link into vmlinux / subdirs we need to visit
 442 init-y          := init/
 443 drivers-y       := drivers/ sound/
 444 net-y           := net/
 445 libs-y          := lib/
 446 core-y          := usr/
 447 endif # KBUILD_EXTMOD
 448
 449 ifeq ($(dot-config),1)
 450 # Read in config
 451 -include include/config/auto.conf
 452
 453 ifeq ($(KBUILD_EXTMOD),)
 454 # Read in dependencies to all Kconfig* files, make sure to run
 455 # oldconfig if changes are detected.
 456 -include include/config/auto.conf.cmd
 457
 458 # To avoid any implicit rule to kick in, define an empty command
 459 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 460
 461 # If .config is newer than include/config/auto.conf, someone tinkered
 462 # with it and forgot to run make oldconfig.
 463 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 464 # we execute the config step to be sure to catch updated Kconfig files
 465 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 466         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 467 else
 468 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 469 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 470 PHONY += include/config/auto.conf
 471
 472 include/config/auto.conf:
 473         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 474         echo;                                                           \
 475         echo "  ERROR: Kernel configuration is invalid.";               \
 476         echo "         include/linux/autoconf.h or $@ are missing.";    \
 477         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 478         echo;                                                           \
 479         /bin/false)
 480
 481 endif # KBUILD_EXTMOD
 482
 483 else
 484 # Dummy target needed, because used as prerequisite
 485 include/config/auto.conf: ;
 486 endif # $(dot-config)
 487
 488 # The all: target is the default when no target is given on the
 489 # command line.
 490 # This allow a user to issue only 'make' to build a kernel including modules
 491 # Defaults vmlinux but it is usually overridden in the arch makefile
 492 all: vmlinux
 493
 494 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 495 KBUILD_CFLAGS   += -Os
 496 else
 497 KBUILD_CFLAGS   += -O2
 498 endif
 499
 500 include $(srctree)/arch/$(ARCH)/Makefile
 501
 502 ifdef CONFIG_FRAME_POINTER
 503 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 504 else
 505 KBUILD_CFLAGS   += -fomit-frame-pointer
 506 endif
 507
 508 ifdef CONFIG_DEBUG_INFO
 509 KBUILD_CFLAGS   += -g
 510 KBUILD_AFLAGS   += -gdwarf-2
 511 endif
 512
 513 # Force gcc to behave correct even for buggy distributions
 514 KBUILD_CFLAGS         += $(call cc-option, -fno-stack-protector)
 515
 516 # arch Makefile may override CC so keep this after arch Makefile is included
 517 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 518 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 519
 520 # warn about C99 declaration after statement
 521 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 522
 523 # disable pointer signed / unsigned warnings in gcc 4.0
 524 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 525
 526 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 527 KBUILD_CPPFLAGS += $(CPPFLAGS)
 528 KBUILD_AFLAGS   += $(AFLAGS)
 529 KBUILD_CFLAGS   += $(CFLAGS)
 530
 531 # Use --build-id when available.
 532 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 533                               $(call ld-option, -Wl$(comma)--build-id,))
 534 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 535 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 536
 537 # Default kernel image to build when no specific target is given.
 538 # KBUILD_IMAGE may be overruled on the command line or
 539 # set in the environment
 540 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 541 # this default value
 542 export KBUILD_IMAGE ?= vmlinux
 543
 544 #
 545 # INSTALL_PATH specifies where to place the updated kernel and system map
 546 # images. Default is /boot, but you can set it to other values
 547 export  INSTALL_PATH ?= /boot
 548
 549 #
 550 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 551 # relocations required by build roots.  This is not defined in the
 552 # makefile but the argument can be passed to make if needed.
 553 #
 554
 555 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 556 export MODLIB
 557
 558 #
 559 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 560 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 561 #  the default option --strip-debug will be used.  Otherwise,
 562 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 563
 564 ifdef INSTALL_MOD_STRIP
 565 ifeq ($(INSTALL_MOD_STRIP),1)
 566 mod_strip_cmd = $(STRIP) --strip-debug
 567 else
 568 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 569 endif # INSTALL_MOD_STRIP=1
 570 else
 571 mod_strip_cmd = true
 572 endif # INSTALL_MOD_STRIP
 573 export mod_strip_cmd
 574
 575
 576 ifeq ($(KBUILD_EXTMOD),)
 577 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 578
 579 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 580                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 581                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 582
 583 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 584                      $(init-n) $(init-) \
 585                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 586                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 587
 588 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 589 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 590 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 591 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 592 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 593 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 594 libs-y          := $(libs-y1) $(libs-y2)
 595
 596 # Build vmlinux
 597 # ---------------------------------------------------------------------------
 598 # vmlinux is built from the objects selected by $(vmlinux-init) and
 599 # $(vmlinux-main). Most are built-in.o files from top-level directories
 600 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 601 # Ordering when linking is important, and $(vmlinux-init) must be first.
 602 #
 603 # vmlinux
 604 #   ^
 605 #   |
 606 #   +-< $(vmlinux-init)
 607 #   |   +--< init/version.o + more
 608 #   |
 609 #   +--< $(vmlinux-main)
 610 #   |    +--< driver/built-in.o mm/built-in.o + more
 611 #   |
 612 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 613 #
 614 # vmlinux version (uname -v) cannot be updated during normal
 615 # descending-into-subdirs phase since we do not yet know if we need to
 616 # update vmlinux.
 617 # Therefore this step is delayed until just before final link of vmlinux -
 618 # except in the kallsyms case where it is done just before adding the
 619 # symbols to the kernel.
 620 #
 621 # System.map is generated to document addresses of all kernel symbols
 622
 623 vmlinux-init := $(head-y) $(init-y)
 624 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 625 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 626 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 627 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 628
 629 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 630 # May be overridden by arch/$(ARCH)/Makefile
 631 quiet_cmd_vmlinux__ ?= LD      $@
 632       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 633       -T $(vmlinux-lds) $(vmlinux-init)                          \
 634       --start-group $(vmlinux-main) --end-group                  \
 635       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 636
 637 # Generate new vmlinux version
 638 quiet_cmd_vmlinux_version = GEN     .version
 639       cmd_vmlinux_version = set -e;                     \
 640         if [ ! -r .version ]; then                      \
 641           rm -f .version;                               \
 642           echo 1 >.version;                             \
 643         else                                            \
 644           mv .version .old_version;                     \
 645           expr 0$$(cat .old_version) + 1 >.version;     \
 646         fi;                                             \
 647         $(MAKE) $(build)=init
 648
 649 # Generate System.map
 650 quiet_cmd_sysmap = SYSMAP
 651       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 652
 653 # Link of vmlinux
 654 # If CONFIG_KALLSYMS is set .version is already updated
 655 # Generate System.map and verify that the content is consistent
 656 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 657 # First command is ':' to allow us to use + in front of the rule
 658 define rule_vmlinux__
 659         :
 660         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 661
 662         $(call cmd,vmlinux__)
 663         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 664
 665         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 666           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 667         $(cmd_sysmap) $@ System.map;                                         \
 668         if [ $$? -ne 0 ]; then                                               \
 669                 rm -f $@;                                                    \
 670                 /bin/false;                                                  \
 671         fi;
 672         $(verify_kallsyms)
 673 endef
 674
 675
 676 ifdef CONFIG_KALLSYMS
 677 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 678 # It's a three stage process:
 679 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 680 #   empty
 681 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 682 #   the right size - vmlinux version (uname -v) is updated during this step
 683 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 684 #   but due to the added section, some addresses have shifted.
 685 #   From here, we generate a correct .tmp_kallsyms2.o
 686 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 687 # o Verify that the System.map from vmlinux matches the map from
 688 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 689 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 690 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 691 #   temporary bypass to allow the kernel to be built while the
 692 #   maintainers work out what went wrong with kallsyms.
 693
 694 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 695 last_kallsyms := 3
 696 else
 697 last_kallsyms := 2
 698 endif
 699
 700 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 701
 702 define verify_kallsyms
 703         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 704           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 705           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 706         $(Q)cmp -s System.map .tmp_System.map ||                             \
 707                 (echo Inconsistent kallsyms data;                            \
 708                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 709                  rm .tmp_kallsyms* ; /bin/false )
 710 endef
 711
 712 # Update vmlinux version before link
 713 # Use + in front of this rule to silent warning about make -j1
 714 # First command is ':' to allow us to use + in front of this rule
 715 cmd_ksym_ld = $(cmd_vmlinux__)
 716 define rule_ksym_ld
 717         :
 718         +$(call cmd,vmlinux_version)
 719         $(call cmd,vmlinux__)
 720         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 721 endef
 722
 723 # Generate .S file with all kernel symbols
 724 quiet_cmd_kallsyms = KSYM    $@
 725       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 726                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 727
 728 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 729         $(call if_changed_dep,as_o_S)
 730
 731 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 732         $(call cmd,kallsyms)
 733
 734 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 735 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 736         $(call if_changed_rule,ksym_ld)
 737
 738 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 739         $(call if_changed,vmlinux__)
 740
 741 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 742         $(call if_changed,vmlinux__)
 743
 744 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 745 $(KALLSYMS): scripts ;
 746
 747 # Generate some data for debugging strange kallsyms problems
 748 debug_kallsyms: .tmp_map$(last_kallsyms)
 749
 750 .tmp_map%: .tmp_vmlinux% FORCE
 751         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 752
 753 .tmp_map3: .tmp_map2
 754
 755 .tmp_map2: .tmp_map1
 756
 757 endif # ifdef CONFIG_KALLSYMS
 758
 759 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 760 # relevant sections renamed as per the linker script.
 761 quiet_cmd_vmlinux-modpost = LD      $@
 762       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 763          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 764          $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
 765 define rule_vmlinux-modpost
 766         :
 767         +$(call cmd,vmlinux-modpost)
 768         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 769         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 770 endef
 771
 772 # vmlinux image - including updated kernel symbols
 773 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
 774 ifdef CONFIG_HEADERS_CHECK
 775         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 776 endif
 777 ifdef CONFIG_SAMPLES
 778         $(Q)$(MAKE) $(build)=samples
 779 endif
 780         $(call vmlinux-modpost)
 781         $(call if_changed_rule,vmlinux__)
 782         $(Q)rm -f .old_version
 783
 784 vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 785         $(call if_changed_rule,vmlinux-modpost)
 786
 787 # The actual objects are generated when descending,
 788 # make sure no implicit rule kicks in
 789 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 790
 791 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 792 # Preset locale variables to speed up the build process. Limit locale
 793 # tweaks to this spot to avoid wrong language settings when running
 794 # make menuconfig etc.
 795 # Error messages still appears in the original language
 796
 797 PHONY += $(vmlinux-dirs)
 798 $(vmlinux-dirs): prepare scripts
 799         $(Q)$(MAKE) $(build)=$@
 800
 801 # Build the kernel release string
 802 #
 803 # The KERNELRELEASE value built here is stored in the file
 804 # include/config/kernel.release, and is used when executing several
 805 # make targets, such as "make install" or "make modules_install."
 806 #
 807 # The eventual kernel release string consists of the following fields,
 808 # shown in a hierarchical format to show how smaller parts are concatenated
 809 # to form the larger and final value, with values coming from places like
 810 # the Makefile, kernel config options, make command line options and/or
 811 # SCM tag information.
 812 #
 813 #       $(KERNELVERSION)
 814 #         $(VERSION)                    eg, 2
 815 #         $(PATCHLEVEL)                 eg, 6
 816 #         $(SUBLEVEL)                   eg, 18
 817 #         $(EXTRAVERSION)               eg, -rc6
 818 #       $(localver-full)
 819 #         $(localver)
 820 #           localversion*               (files without backups, containing '~')
 821 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 822 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 823 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 824 #           $(LOCALVERSION)             (from make command line if provided)
 825 #
 826 #  Note how the final $(localver-auto) string is included *only* if the
 827 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 828 # moment, only git is supported but other SCMs can edit the script
 829 # scripts/setlocalversion and add the appropriate checks as needed.
 830
 831 pattern = ".*/localversion[^~]*"
 832 string  = $(shell cat /dev/null \
 833            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 834
 835 localver = $(subst $(space),, $(string) \
 836                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 837
 838 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 839 # and if the SCM is know a tag from the SCM is appended.
 840 # The appended tag is determined by the SCM used.
 841 #
 842 # Currently, only git is supported.
 843 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 844 # checks as needed.
 845 ifdef CONFIG_LOCALVERSION_AUTO
 846         _localver-auto = $(shell $(CONFIG_SHELL) \
 847                           $(srctree)/scripts/setlocalversion $(srctree))
 848         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 849 endif
 850
 851 localver-full = $(localver)$(localver-auto)
 852
 853 # Store (new) KERNELRELASE string in include/config/kernel.release
 854 kernelrelease = $(KERNELVERSION)$(localver-full)
 855 include/config/kernel.release: include/config/auto.conf FORCE
 856         $(Q)rm -f $@
 857         $(Q)echo $(kernelrelease) > $@
 858
 859
 860 # Things we need to do before we recursively start building the kernel
 861 # or the modules are listed in "prepare".
 862 # A multi level approach is used. prepareN is processed before prepareN-1.
 863 # archprepare is used in arch Makefiles and when processed asm symlink,
 864 # version.h and scripts_basic is processed / created.
 865
 866 # Listed in dependency order
 867 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 868
 869 # prepare3 is used to check if we are building in a separate output directory,
 870 # and if so do:
 871 # 1) Check that make has not been executed in the kernel src $(srctree)
 872 # 2) Create the include2 directory, used for the second asm symlink
 873 prepare3: include/config/kernel.release
 874 ifneq ($(KBUILD_SRC),)
 875         @echo '  Using $(srctree) as source for kernel'
 876         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 877                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 878                 echo "  in the '$(srctree)' directory.";\
 879                 /bin/false; \
 880         fi;
 881         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 882         $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
 883 endif
 884
 885 # prepare2 creates a makefile if using a separate output directory
 886 prepare2: prepare3 outputmakefile
 887
 888 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 889                    include/asm include/config/auto.conf
 890 ifneq ($(KBUILD_MODULES),)
 891         $(Q)mkdir -p $(MODVERDIR)
 892         $(Q)rm -f $(MODVERDIR)/*
 893 endif
 894
 895 archprepare: prepare1 scripts_basic
 896
 897 prepare0: archprepare FORCE
 898         $(Q)$(MAKE) $(build)=.
 899         $(Q)$(MAKE) $(build)=. missing-syscalls
 900
 901 # All the preparing..
 902 prepare: prepare0
 903
 904 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 905 # done in arch/$(ARCH)/kernel/Makefile
 906
 907 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 908
 909 # FIXME: The asm symlink changes when $(ARCH) changes. That's
 910 # hard to detect, but I suppose "make mrproper" is a good idea
 911 # before switching between archs anyway.
 912
 913 include/asm:
 914         @echo '  SYMLINK $@ -> include/asm-$(SRCARCH)'
 915         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 916         @ln -fsn asm-$(SRCARCH) $@
 917
 918 # Generate some files
 919 # ---------------------------------------------------------------------------
 920
 921 # KERNELRELEASE can change from a few different places, meaning version.h
 922 # needs to be updated, so this check is forced on all builds
 923
 924 uts_len := 64
 925 define filechk_utsrelease.h
 926         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 927           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 928           exit 1;                                                         \
 929         fi;                                                               \
 930         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 931 endef
 932
 933 define filechk_version.h
 934         (echo \#define LINUX_VERSION_CODE $(shell                             \
 935         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 936         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 937 endef
 938
 939 include/linux/version.h: $(srctree)/Makefile FORCE
 940         $(call filechk,version.h)
 941
 942 include/linux/utsrelease.h: include/config/kernel.release FORCE
 943         $(call filechk,utsrelease.h)
 944
 945 # ---------------------------------------------------------------------------
 946
 947 PHONY += depend dep
 948 depend dep:
 949         @echo '*** Warning: make $@ is unnecessary now.'
 950
 951 # ---------------------------------------------------------------------------
 952 # Kernel headers
 953 INSTALL_HDR_PATH=$(objtree)/usr
 954 export INSTALL_HDR_PATH
 955
 956 HDRFILTER=generic i386 x86_64
 957 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
 958
 959 PHONY += headers_install_all
 960 headers_install_all: include/linux/version.h scripts_basic FORCE
 961         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
 962         $(Q)for arch in $(HDRARCHES); do \
 963          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
 964          done
 965
 966 PHONY += headers_install
 967 headers_install: include/linux/version.h scripts_basic FORCE
 968         @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
 969           echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
 970           exit 1 ; fi
 971         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
 972         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
 973
 974 PHONY += headers_check_all
 975 headers_check_all: headers_install_all
 976         $(Q)for arch in $(HDRARCHES); do \
 977          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
 978          done
 979
 980 PHONY += headers_check
 981 headers_check: headers_install
 982         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
 983
 984 # ---------------------------------------------------------------------------
 985 # Modules
 986
 987 ifdef CONFIG_MODULES
 988
 989 # By default, build modules as well
 990
 991 all: modules
 992
 993 #       Build modules
 994
 995 PHONY += modules
 996 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 997         @echo '  Building modules, stage 2.';
 998         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 999
1000
1001 # Target to prepare building external modules
1002 PHONY += modules_prepare
1003 modules_prepare: prepare scripts
1004
1005 # Target to install modules
1006 PHONY += modules_install
1007 modules_install: _modinst_ _modinst_post
1008
1009 PHONY += _modinst_
1010 _modinst_:
1011         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1012                 echo "Warning: you may need to install module-init-tools"; \
1013                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1014                 sleep 1; \
1015         fi
1016         @rm -rf $(MODLIB)/kernel
1017         @rm -f $(MODLIB)/source
1018         @mkdir -p $(MODLIB)/kernel
1019         @ln -s $(srctree) $(MODLIB)/source
1020         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1021                 rm -f $(MODLIB)/build ; \
1022                 ln -s $(objtree) $(MODLIB)/build ; \
1023         fi
1024         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1025
1026 # If System.map exists, run depmod.  This deliberately does not have a
1027 # dependency on System.map since that would run the dependency tree on
1028 # vmlinux.  This depmod is only for convenience to give the initial
1029 # boot a modules.dep even before / is mounted read-write.  However the
1030 # boot script depmod is the master version.
1031 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
1032 depmod_opts     :=
1033 else
1034 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
1035 endif
1036 PHONY += _modinst_post
1037 _modinst_post: _modinst_
1038         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
1039
1040 else # CONFIG_MODULES
1041
1042 # Modules not configured
1043 # ---------------------------------------------------------------------------
1044
1045 modules modules_install: FORCE
1046         @echo
1047         @echo "The present kernel configuration has modules disabled."
1048         @echo "Type 'make config' and enable loadable module support."
1049         @echo "Then build a kernel with module support enabled."
1050         @echo
1051         @exit 1
1052
1053 endif # CONFIG_MODULES
1054
1055 ###
1056 # Cleaning is done on three levels.
1057 # make clean     Delete most generated files
1058 #                Leave enough to build external modules
1059 # make mrproper  Delete the current configuration, and all generated files
1060 # make distclean Remove editor backup files, patch leftover files and the like
1061
1062 # Directories & files removed with 'make clean'
1063 CLEAN_DIRS  += $(MODVERDIR)
1064 CLEAN_FILES +=  vmlinux System.map \
1065                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1066
1067 # Directories & files removed with 'make mrproper'
1068 MRPROPER_DIRS  += include/config include2 usr/include
1069 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1070                   include/linux/autoconf.h include/linux/version.h      \
1071                   include/linux/utsrelease.h                            \
1072                   Module.symvers tags TAGS cscope*
1073
1074 # clean - Delete most, but leave enough to build external modules
1075 #
1076 clean: rm-dirs  := $(CLEAN_DIRS)
1077 clean: rm-files := $(CLEAN_FILES)
1078 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1079
1080 PHONY += $(clean-dirs) clean archclean
1081 $(clean-dirs):
1082         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1083
1084 clean: archclean $(clean-dirs)
1085         $(call cmd,rmdirs)
1086         $(call cmd,rmfiles)
1087         @find . $(RCS_FIND_IGNORE) \
1088                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1089                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1090                 -o -name '*.symtypes' \) \
1091                 -type f -print | xargs rm -f
1092
1093 # mrproper - Delete all generated files, including .config
1094 #
1095 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1096 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1097 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1098
1099 PHONY += $(mrproper-dirs) mrproper archmrproper
1100 $(mrproper-dirs):
1101         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1102
1103 mrproper: clean archmrproper $(mrproper-dirs)
1104         $(call cmd,rmdirs)
1105         $(call cmd,rmfiles)
1106
1107 # distclean
1108 #
1109 PHONY += distclean
1110
1111 distclean: mrproper
1112         @find $(srctree) $(RCS_FIND_IGNORE) \
1113                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1114                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1115                 -o -name '.*.rej' -o -size 0 \
1116                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1117                 -type f -print | xargs rm -f
1118
1119
1120 # Packaging of the kernel to various formats
1121 # ---------------------------------------------------------------------------
1122 # rpm target kept for backward compatibility
1123 package-dir     := $(srctree)/scripts/package
1124
1125 %pkg: include/config/kernel.release FORCE
1126         $(Q)$(MAKE) $(build)=$(package-dir) $@
1127 rpm: include/config/kernel.release FORCE
1128         $(Q)$(MAKE) $(build)=$(package-dir) $@
1129
1130
1131 # Brief documentation of the typical targets used
1132 # ---------------------------------------------------------------------------
1133
1134 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1135 boards := $(notdir $(boards))
1136
1137 help:
1138         @echo  'Cleaning targets:'
1139         @echo  '  clean           - Remove most generated files but keep the config and'
1140         @echo  '                    enough build support to build external modules'
1141         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1142         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1143         @echo  ''
1144         @echo  'Configuration targets:'
1145         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1146         @echo  ''
1147         @echo  'Other generic targets:'
1148         @echo  '  all             - Build all targets marked with [*]'
1149         @echo  '* vmlinux         - Build the bare kernel'
1150         @echo  '* modules         - Build all modules'
1151         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1152         @echo  '  dir/            - Build all files in dir and below'
1153         @echo  '  dir/file.[ois]  - Build specified target only'
1154         @echo  '  dir/file.ko     - Build module including final link'
1155         @echo  '  rpm             - Build a kernel as an RPM package'
1156         @echo  '  tags/TAGS       - Generate tags file for editors'
1157         @echo  '  cscope          - Generate cscope index'
1158         @echo  '  kernelrelease   - Output the release version string'
1159         @echo  '  kernelversion   - Output the version stored in Makefile'
1160         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1161          echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1162          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1163          fi
1164         @echo  ''
1165         @echo  'Static analysers'
1166         @echo  '  checkstack      - Generate a list of stack hogs'
1167         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1168         @echo  '  export_report   - List the usages of all exported symbols'
1169         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1170          echo  '  headers_check   - Sanity check on exported headers'; \
1171          fi
1172         @echo  ''
1173         @echo  'Kernel packaging:'
1174         @$(MAKE) $(build)=$(package-dir) help
1175         @echo  ''
1176         @echo  'Documentation targets:'
1177         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1178         @echo  ''
1179         @echo  'Architecture specific targets ($(ARCH)):'
1180         @$(if $(archhelp),$(archhelp),\
1181                 echo '  No architecture specific help defined for $(ARCH)')
1182         @echo  ''
1183         @$(if $(boards), \
1184                 $(foreach b, $(boards), \
1185                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1186                 echo '')
1187
1188         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1189         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1190         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1191         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1192         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1193         @echo  ''
1194         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1195         @echo  'For further info see the ./README file'
1196
1197
1198 # Documentation targets
1199 # ---------------------------------------------------------------------------
1200 %docs: scripts_basic FORCE
1201         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1202
1203 else # KBUILD_EXTMOD
1204
1205 ###
1206 # External module support.
1207 # When building external modules the kernel used as basis is considered
1208 # read-only, and no consistency checks are made and the make
1209 # system is not used on the basis kernel. If updates are required
1210 # in the basis kernel ordinary make commands (without M=...) must
1211 # be used.
1212 #
1213 # The following are the only valid targets when building external
1214 # modules.
1215 # make M=dir clean     Delete all automatically generated files
1216 # make M=dir modules   Make all modules in specified dir
1217 # make M=dir           Same as 'make M=dir modules'
1218 # make M=dir modules_install
1219 #                      Install the modules built in the module directory
1220 #                      Assumes install directory is already created
1221
1222 # We are always building modules
1223 KBUILD_MODULES := 1
1224 PHONY += crmodverdir
1225 crmodverdir:
1226         $(Q)mkdir -p $(MODVERDIR)
1227         $(Q)rm -f $(MODVERDIR)/*
1228
1229 PHONY += $(objtree)/Module.symvers
1230 $(objtree)/Module.symvers:
1231         @test -e $(objtree)/Module.symvers || ( \
1232         echo; \
1233         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1234         echo "           is missing; modules will have no dependencies and modversions."; \
1235         echo )
1236
1237 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1238 PHONY += $(module-dirs) modules
1239 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1240         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1241
1242 modules: $(module-dirs)
1243         @echo '  Building modules, stage 2.';
1244         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1245
1246 PHONY += modules_install
1247 modules_install: _emodinst_ _emodinst_post
1248
1249 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1250 PHONY += _emodinst_
1251 _emodinst_:
1252         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1253         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1254
1255 # Run depmod only is we have System.map and depmod is executable
1256 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1257       cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1258                       $(DEPMOD) -ae -F System.map             \
1259                       $(if $(strip $(INSTALL_MOD_PATH)),      \
1260                       -b $(INSTALL_MOD_PATH) -r)              \
1261                       $(KERNELRELEASE);                       \
1262                    fi
1263
1264 PHONY += _emodinst_post
1265 _emodinst_post: _emodinst_
1266         $(call cmd,depmod)
1267
1268 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1269
1270 PHONY += $(clean-dirs) clean
1271 $(clean-dirs):
1272         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1273
1274 clean:  rm-dirs := $(MODVERDIR)
1275 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1276 clean: $(clean-dirs)
1277         $(call cmd,rmdirs)
1278         $(call cmd,rmfiles)
1279         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1280                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1281                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1282                 -type f -print | xargs rm -f
1283
1284 help:
1285         @echo  '  Building external modules.'
1286         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1287         @echo  ''
1288         @echo  '  modules         - default target, build the module(s)'
1289         @echo  '  modules_install - install the module'
1290         @echo  '  clean           - remove generated files in module directory only'
1291         @echo  ''
1292
1293 # Dummies...
1294 PHONY += prepare scripts
1295 prepare: ;
1296 scripts: ;
1297 endif # KBUILD_EXTMOD
1298
1299 # Generate tags for editors
1300 # ---------------------------------------------------------------------------
1301
1302 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1303 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1304 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1305
1306 ifeq ($(src),$(obj))
1307 __srctree =
1308 else
1309 __srctree = $(srctree)/
1310 endif
1311
1312 ifeq ($(ALLSOURCE_ARCHS),)
1313 ifeq ($(ARCH),um)
1314 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1315 else
1316 ALLINCLUDE_ARCHS := $(SRCARCH)
1317 endif
1318 else
1319 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1320 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1321 endif
1322
1323 # Take care of arch/x86
1324 ifeq ($(ARCH), $(SRCARCH))
1325 ALLSOURCE_ARCHS := $(ARCH)
1326 else
1327 ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
1328 endif
1329
1330 define find-sources
1331         ( for arch in $(ALLSOURCE_ARCHS) ; do \
1332                find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1333                     -name $1 -print; \
1334           done ; \
1335           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1336                -name $1 -print; \
1337           find $(__srctree)include $(RCS_FIND_IGNORE) \
1338                \( -name config -o -name 'asm-*' \) -prune \
1339                -o -name $1 -print; \
1340           for arch in $(ALLINCLUDE_ARCHS) ; do \
1341                find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1342                     -name $1 -print; \
1343           done ; \
1344           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1345                -name $1 -print; \
1346           find $(__srctree) $(RCS_FIND_IGNORE) \
1347                \( -name include -o -name arch \) -prune -o \
1348                -name $1 -print; \
1349           )
1350 endef
1351
1352 define all-sources
1353         $(call find-sources,'*.[chS]')
1354 endef
1355 define all-kconfigs
1356         $(call find-sources,'Kconfig*')
1357 endef
1358 define all-defconfigs
1359         $(call find-sources,'defconfig')
1360 endef
1361
1362 define xtags
1363         if $1 --version 2>&1 | grep -iq exuberant; then \
1364             $(all-sources) | xargs $1 -a \
1365                 -I __initdata,__exitdata,__acquires,__releases \
1366                 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1367                 --extra=+f --c-kinds=+px \
1368                 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1369             $(all-kconfigs) | xargs $1 -a \
1370                 --langdef=kconfig \
1371                 --language-force=kconfig \
1372                 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1373             $(all-defconfigs) | xargs -r $1 -a \
1374                 --langdef=dotconfig \
1375                 --language-force=dotconfig \
1376                 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1377         elif $1 --version 2>&1 | grep -iq emacs; then \
1378             $(all-sources) | xargs $1 -a; \
1379             $(all-kconfigs) | xargs $1 -a \
1380                 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1381             $(all-defconfigs) | xargs -r $1 -a \
1382                 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1383         else \
1384             $(all-sources) | xargs $1 -a; \
1385         fi
1386 endef
1387
1388 quiet_cmd_cscope-file = FILELST cscope.files
1389       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1390
1391 quiet_cmd_cscope = MAKE    cscope.out
1392       cmd_cscope = cscope -b
1393
1394 cscope: FORCE
1395         $(call cmd,cscope-file)
1396         $(call cmd,cscope)
1397
1398 quiet_cmd_TAGS = MAKE   $@
1399 define cmd_TAGS
1400         rm -f $@; \
1401         $(call xtags,etags)
1402 endef
1403
1404 TAGS: FORCE
1405         $(call cmd,TAGS)
1406
1407 quiet_cmd_tags = MAKE   $@
1408 define cmd_tags
1409         rm -f $@; \
1410         $(call xtags,ctags)
1411 endef
1412
1413 tags: FORCE
1414         $(call cmd,tags)
1415
1416
1417 # Scripts to check various things for consistency
1418 # ---------------------------------------------------------------------------
1419
1420 includecheck:
1421         find * $(RCS_FIND_IGNORE) \
1422                 -name '*.[hcS]' -type f -print | sort \
1423                 | xargs $(PERL) -w scripts/checkincludes.pl
1424
1425 versioncheck:
1426         find * $(RCS_FIND_IGNORE) \
1427                 -name '*.[hcS]' -type f -print | sort \
1428                 | xargs $(PERL) -w scripts/checkversion.pl
1429
1430 namespacecheck:
1431         $(PERL) $(srctree)/scripts/namespace.pl
1432
1433 export_report:
1434         $(PERL) $(srctree)/scripts/export_report.pl
1435
1436 endif #ifeq ($(config-targets),1)
1437 endif #ifeq ($(mixed-targets),1)
1438
1439 PHONY += checkstack kernelrelease kernelversion
1440
1441 # UML needs a little special treatment here.  It wants to use the host
1442 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1443 # else wants $(ARCH), including people doing cross-builds, which means
1444 # that $(SUBARCH) doesn't work here.
1445 ifeq ($(ARCH), um)
1446 CHECKSTACK_ARCH := $(SUBARCH)
1447 else
1448 CHECKSTACK_ARCH := $(ARCH)
1449 endif
1450 checkstack:
1451         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1452         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1453
1454 kernelrelease:
1455         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1456         $(error kernelrelease not valid - run 'make prepare' to update it))
1457 kernelversion:
1458         @echo $(KERNELVERSION)
1459
1460 # Single targets
1461 # ---------------------------------------------------------------------------
1462 # Single targets are compatible with:
1463 # - build whith mixed source and output
1464 # - build with separate output dir 'make O=...'
1465 # - external modules
1466 #
1467 #  target-dir => where to store outputfile
1468 #  build-dir  => directory in kernel source tree to use
1469
1470 ifeq ($(KBUILD_EXTMOD),)
1471         build-dir  = $(patsubst %/,%,$(dir $@))
1472         target-dir = $(dir $@)
1473 else
1474         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1475         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1476         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1477 endif
1478
1479 %.s: %.c prepare scripts FORCE
1480         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1481 %.i: %.c prepare scripts FORCE
1482         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1483 %.o: %.c prepare scripts FORCE
1484         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1485 %.lst: %.c prepare scripts FORCE
1486         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1487 %.s: %.S prepare scripts FORCE
1488         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1489 %.o: %.S prepare scripts FORCE
1490         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1491 %.symtypes: %.c prepare scripts FORCE
1492         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1493
1494 # Modules
1495 / %/: prepare scripts FORCE
1496         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1497         $(build)=$(build-dir)
1498 %.ko: prepare scripts FORCE
1499         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1500         $(build)=$(build-dir) $(@:.ko=.o)
1501         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1502
1503 # FIXME Should go into a make.lib or something
1504 # ===========================================================================
1505
1506 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1507       cmd_rmdirs = rm -rf $(rm-dirs)
1508
1509 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1510       cmd_rmfiles = rm -f $(rm-files)
1511
1512
1513 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1514           $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1515           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1516
1517 quiet_cmd_as_o_S = AS      $@
1518 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1519
1520 # read all saved command lines
1521
1522 targets := $(wildcard $(sort $(targets)))
1523 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1524
1525 ifneq ($(cmd_files),)
1526   $(cmd_files): ;       # Do not try to update included dependency files
1527   include $(cmd_files)
1528 endif
1529
1530 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1531 # Usage:
1532 # $(Q)$(MAKE) $(clean)=dir
1533 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1534
1535 endif   # skip-makefile
1536
1537 PHONY += FORCE
1538 FORCE:
1539
1540 # Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1541 Makefile: ;
1542
1543 # Declare the contents of the .PHONY variable as phony.  We keep that
1544 # information in a variable se we can use it in if_changed and friends.
1545 .PHONY: $(PHONY)