Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 24
   4 EXTRAVERSION = -rc1
   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 # for i386 and x86_64 we use SRCARCH equal to x86
 200 SRCARCH := $(if $(filter x86_64 i386,$(SRCARCH)),x86,$(SRCARCH))
 201
 202 KCONFIG_CONFIG  ?= .config
 203
 204 # SHELL used by kbuild
 205 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 206           else if [ -x /bin/bash ]; then echo /bin/bash; \
 207           else echo sh; fi ; fi)
 208
 209 HOSTCC       = gcc
 210 HOSTCXX      = g++
 211 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 212 HOSTCXXFLAGS = -O2
 213
 214 # Decide whether to build built-in, modular, or both.
 215 # Normally, just do built-in.
 216
 217 KBUILD_MODULES :=
 218 KBUILD_BUILTIN := 1
 219
 220 #       If we have only "make modules", don't compile built-in objects.
 221 #       When we're building modules with modversions, we need to consider
 222 #       the built-in objects during the descend as well, in order to
 223 #       make sure the checksums are up to date before we record them.
 224
 225 ifeq ($(MAKECMDGOALS),modules)
 226   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 227 endif
 228
 229 #       If we have "make <whatever> modules", compile modules
 230 #       in addition to whatever we do anyway.
 231 #       Just "make" or "make all" shall build modules as well
 232
 233 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 234   KBUILD_MODULES := 1
 235 endif
 236
 237 ifeq ($(MAKECMDGOALS),)
 238   KBUILD_MODULES := 1
 239 endif
 240
 241 export KBUILD_MODULES KBUILD_BUILTIN
 242 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 243
 244 # Beautify output
 245 # ---------------------------------------------------------------------------
 246 #
 247 # Normally, we echo the whole command before executing it. By making
 248 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 249 # $(quiet) to choose other forms of output instead, e.g.
 250 #
 251 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 252 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 253 #
 254 # If $(quiet) is empty, the whole command will be printed.
 255 # If it is set to "quiet_", only the short version will be printed.
 256 # If it is set to "silent_", nothing will be printed at all, since
 257 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 258 #
 259 # A simple variant is to prefix commands with $(Q) - that's useful
 260 # for commands that shall be hidden in non-verbose mode.
 261 #
 262 #       $(Q)ln $@ :<
 263 #
 264 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 265 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 266
 267 ifeq ($(KBUILD_VERBOSE),1)
 268   quiet =
 269   Q =
 270 else
 271   quiet=quiet_
 272   Q = @
 273 endif
 274
 275 # If the user is running make -s (silent mode), suppress echoing of
 276 # commands
 277
 278 ifneq ($(findstring s,$(MAKEFLAGS)),)
 279   quiet=silent_
 280 endif
 281
 282 export quiet Q KBUILD_VERBOSE
 283
 284
 285 # Look for make include files relative to root of kernel src
 286 MAKEFLAGS += --include-dir=$(srctree)
 287
 288 # We need some generic definitions.
 289 include $(srctree)/scripts/Kbuild.include
 290
 291 # Make variables (CC, etc...)
 292
 293 AS              = $(CROSS_COMPILE)as
 294 LD              = $(CROSS_COMPILE)ld
 295 CC              = $(CROSS_COMPILE)gcc
 296 CPP             = $(CC) -E
 297 AR              = $(CROSS_COMPILE)ar
 298 NM              = $(CROSS_COMPILE)nm
 299 STRIP           = $(CROSS_COMPILE)strip
 300 OBJCOPY         = $(CROSS_COMPILE)objcopy
 301 OBJDUMP         = $(CROSS_COMPILE)objdump
 302 AWK             = awk
 303 GENKSYMS        = scripts/genksyms/genksyms
 304 DEPMOD          = /sbin/depmod
 305 KALLSYMS        = scripts/kallsyms
 306 PERL            = perl
 307 CHECK           = sparse
 308
 309 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 310 MODFLAGS        = -DMODULE
 311 CFLAGS_MODULE   = $(MODFLAGS)
 312 AFLAGS_MODULE   = $(MODFLAGS)
 313 LDFLAGS_MODULE  =
 314 CFLAGS_KERNEL   =
 315 AFLAGS_KERNEL   =
 316
 317
 318 # Use LINUXINCLUDE when you must reference the include/ directory.
 319 # Needed to be compatible with the O= option
 320 LINUXINCLUDE    := -Iinclude \
 321                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 322                    -include include/linux/autoconf.h
 323
 324 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
 325
 326 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 327                    -fno-strict-aliasing -fno-common \
 328                    -Werror-implicit-function-declaration
 329 KBUILD_AFLAGS   := -D__ASSEMBLY__
 330
 331 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 332 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 333 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 334
 335 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 336 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 337 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 338 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 339
 340 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 341 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 342 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 343
 344 # When compiling out-of-tree modules, put MODVERDIR in the module
 345 # tree rather than in the kernel tree. The kernel tree might
 346 # even be read-only.
 347 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 348
 349 # Files to ignore in find ... statements
 350
 351 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
 352 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 353
 354 # ===========================================================================
 355 # Rules shared between *config targets and build targets
 356
 357 # Basic helpers built in scripts/
 358 PHONY += scripts_basic
 359 scripts_basic:
 360         $(Q)$(MAKE) $(build)=scripts/basic
 361
 362 # To avoid any implicit rule to kick in, define an empty command.
 363 scripts/basic/%: scripts_basic ;
 364
 365 PHONY += outputmakefile
 366 # outputmakefile generates a Makefile in the output directory, if using a
 367 # separate output directory. This allows convenient use of make in the
 368 # output directory.
 369 outputmakefile:
 370 ifneq ($(KBUILD_SRC),)
 371         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 372             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 373 endif
 374
 375 # To make sure we do not include .config for any of the *config targets
 376 # catch them early, and hand them over to scripts/kconfig/Makefile
 377 # It is allowed to specify more targets when calling make, including
 378 # mixing *config targets and build targets.
 379 # For example 'make oldconfig all'.
 380 # Detect when mixed targets is specified, and make a second invocation
 381 # of make so .config is not included in this case either (for *config).
 382
 383 no-dot-config-targets := clean mrproper distclean \
 384                          cscope TAGS tags help %docs check% \
 385                          include/linux/version.h headers_% \
 386                          kernelrelease kernelversion
 387
 388 config-targets := 0
 389 mixed-targets  := 0
 390 dot-config     := 1
 391
 392 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 393         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 394                 dot-config := 0
 395         endif
 396 endif
 397
 398 ifeq ($(KBUILD_EXTMOD),)
 399         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 400                 config-targets := 1
 401                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 402                         mixed-targets := 1
 403                 endif
 404         endif
 405 endif
 406
 407 ifeq ($(mixed-targets),1)
 408 # ===========================================================================
 409 # We're called with mixed targets (*config and build targets).
 410 # Handle them one by one.
 411
 412 %:: FORCE
 413         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 414
 415 else
 416 ifeq ($(config-targets),1)
 417 # ===========================================================================
 418 # *config targets only - make sure prerequisites are updated, and descend
 419 # in scripts/kconfig to make the *config target
 420
 421 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 422 # KBUILD_DEFCONFIG may point out an alternative default configuration
 423 # used for 'make defconfig'
 424 include $(srctree)/arch/$(SRCARCH)/Makefile
 425 export KBUILD_DEFCONFIG
 426
 427 config %config: scripts_basic outputmakefile FORCE
 428         $(Q)mkdir -p include/linux include/config
 429         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 430
 431 else
 432 # ===========================================================================
 433 # Build targets only - this includes vmlinux, arch specific targets, clean
 434 # targets and others. In general all targets except *config targets.
 435
 436 ifeq ($(KBUILD_EXTMOD),)
 437 # Additional helpers built in scripts/
 438 # Carefully list dependencies so we do not try to build scripts twice
 439 # in parallel
 440 PHONY += scripts
 441 scripts: scripts_basic include/config/auto.conf
 442         $(Q)$(MAKE) $(build)=$(@)
 443
 444 # Objects we will link into vmlinux / subdirs we need to visit
 445 init-y          := init/
 446 drivers-y       := drivers/ sound/
 447 net-y           := net/
 448 libs-y          := lib/
 449 core-y          := usr/
 450 endif # KBUILD_EXTMOD
 451
 452 ifeq ($(dot-config),1)
 453 # Read in config
 454 -include include/config/auto.conf
 455
 456 ifeq ($(KBUILD_EXTMOD),)
 457 # Read in dependencies to all Kconfig* files, make sure to run
 458 # oldconfig if changes are detected.
 459 -include include/config/auto.conf.cmd
 460
 461 # To avoid any implicit rule to kick in, define an empty command
 462 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 463
 464 # If .config is newer than include/config/auto.conf, someone tinkered
 465 # with it and forgot to run make oldconfig.
 466 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 467 # we execute the config step to be sure to catch updated Kconfig files
 468 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 469         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 470 else
 471 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 472 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 473 PHONY += include/config/auto.conf
 474
 475 include/config/auto.conf:
 476         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 477         echo;                                                           \
 478         echo "  ERROR: Kernel configuration is invalid.";               \
 479         echo "         include/linux/autoconf.h or $@ are missing.";    \
 480         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 481         echo;                                                           \
 482         /bin/false)
 483
 484 endif # KBUILD_EXTMOD
 485
 486 else
 487 # Dummy target needed, because used as prerequisite
 488 include/config/auto.conf: ;
 489 endif # $(dot-config)
 490
 491 # The all: target is the default when no target is given on the
 492 # command line.
 493 # This allow a user to issue only 'make' to build a kernel including modules
 494 # Defaults vmlinux but it is usually overridden in the arch makefile
 495 all: vmlinux
 496
 497 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 498 KBUILD_CFLAGS   += -Os
 499 else
 500 KBUILD_CFLAGS   += -O2
 501 endif
 502
 503 include $(srctree)/arch/$(SRCARCH)/Makefile
 504
 505 ifdef CONFIG_FRAME_POINTER
 506 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 507 else
 508 KBUILD_CFLAGS   += -fomit-frame-pointer
 509 endif
 510
 511 ifdef CONFIG_DEBUG_INFO
 512 KBUILD_CFLAGS   += -g
 513 KBUILD_AFLAGS   += -gdwarf-2
 514 endif
 515
 516 # Force gcc to behave correct even for buggy distributions
 517 KBUILD_CFLAGS         += $(call cc-option, -fno-stack-protector)
 518
 519 # arch Makefile may override CC so keep this after arch Makefile is included
 520 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 521 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 522
 523 # warn about C99 declaration after statement
 524 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 525
 526 # disable pointer signed / unsigned warnings in gcc 4.0
 527 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 528
 529 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 530 KBUILD_CPPFLAGS += $(CPPFLAGS)
 531 KBUILD_AFLAGS   += $(AFLAGS)
 532 KBUILD_CFLAGS   += $(CFLAGS)
 533
 534 # Use --build-id when available.
 535 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 536                               $(call ld-option, -Wl$(comma)--build-id,))
 537 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 538 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 539
 540 # Default kernel image to build when no specific target is given.
 541 # KBUILD_IMAGE may be overruled on the command line or
 542 # set in the environment
 543 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 544 # this default value
 545 export KBUILD_IMAGE ?= vmlinux
 546
 547 #
 548 # INSTALL_PATH specifies where to place the updated kernel and system map
 549 # images. Default is /boot, but you can set it to other values
 550 export  INSTALL_PATH ?= /boot
 551
 552 #
 553 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 554 # relocations required by build roots.  This is not defined in the
 555 # makefile but the argument can be passed to make if needed.
 556 #
 557
 558 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 559 export MODLIB
 560
 561 #
 562 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 563 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 564 #  the default option --strip-debug will be used.  Otherwise,
 565 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 566
 567 ifdef INSTALL_MOD_STRIP
 568 ifeq ($(INSTALL_MOD_STRIP),1)
 569 mod_strip_cmd = $(STRIP) --strip-debug
 570 else
 571 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 572 endif # INSTALL_MOD_STRIP=1
 573 else
 574 mod_strip_cmd = true
 575 endif # INSTALL_MOD_STRIP
 576 export mod_strip_cmd
 577
 578
 579 ifeq ($(KBUILD_EXTMOD),)
 580 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 581
 582 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 583                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 584                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 585
 586 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 587                      $(init-n) $(init-) \
 588                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 589                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 590
 591 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 592 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 593 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 594 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 595 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 596 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 597 libs-y          := $(libs-y1) $(libs-y2)
 598
 599 # Build vmlinux
 600 # ---------------------------------------------------------------------------
 601 # vmlinux is built from the objects selected by $(vmlinux-init) and
 602 # $(vmlinux-main). Most are built-in.o files from top-level directories
 603 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 604 # Ordering when linking is important, and $(vmlinux-init) must be first.
 605 #
 606 # vmlinux
 607 #   ^
 608 #   |
 609 #   +-< $(vmlinux-init)
 610 #   |   +--< init/version.o + more
 611 #   |
 612 #   +--< $(vmlinux-main)
 613 #   |    +--< driver/built-in.o mm/built-in.o + more
 614 #   |
 615 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 616 #
 617 # vmlinux version (uname -v) cannot be updated during normal
 618 # descending-into-subdirs phase since we do not yet know if we need to
 619 # update vmlinux.
 620 # Therefore this step is delayed until just before final link of vmlinux -
 621 # except in the kallsyms case where it is done just before adding the
 622 # symbols to the kernel.
 623 #
 624 # System.map is generated to document addresses of all kernel symbols
 625
 626 vmlinux-init := $(head-y) $(init-y)
 627 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 628 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 629 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 630 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 631
 632 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 633 # May be overridden by arch/$(ARCH)/Makefile
 634 quiet_cmd_vmlinux__ ?= LD      $@
 635       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 636       -T $(vmlinux-lds) $(vmlinux-init)                          \
 637       --start-group $(vmlinux-main) --end-group                  \
 638       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 639
 640 # Generate new vmlinux version
 641 quiet_cmd_vmlinux_version = GEN     .version
 642       cmd_vmlinux_version = set -e;                     \
 643         if [ ! -r .version ]; then                      \
 644           rm -f .version;                               \
 645           echo 1 >.version;                             \
 646         else                                            \
 647           mv .version .old_version;                     \
 648           expr 0$$(cat .old_version) + 1 >.version;     \
 649         fi;                                             \
 650         $(MAKE) $(build)=init
 651
 652 # Generate System.map
 653 quiet_cmd_sysmap = SYSMAP
 654       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 655
 656 # Link of vmlinux
 657 # If CONFIG_KALLSYMS is set .version is already updated
 658 # Generate System.map and verify that the content is consistent
 659 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 660 # First command is ':' to allow us to use + in front of the rule
 661 define rule_vmlinux__
 662         :
 663         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 664
 665         $(call cmd,vmlinux__)
 666         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 667
 668         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 669           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 670         $(cmd_sysmap) $@ System.map;                                         \
 671         if [ $$? -ne 0 ]; then                                               \
 672                 rm -f $@;                                                    \
 673                 /bin/false;                                                  \
 674         fi;
 675         $(verify_kallsyms)
 676 endef
 677
 678
 679 ifdef CONFIG_KALLSYMS
 680 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 681 # It's a three stage process:
 682 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 683 #   empty
 684 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 685 #   the right size - vmlinux version (uname -v) is updated during this step
 686 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 687 #   but due to the added section, some addresses have shifted.
 688 #   From here, we generate a correct .tmp_kallsyms2.o
 689 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 690 # o Verify that the System.map from vmlinux matches the map from
 691 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 692 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 693 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 694 #   temporary bypass to allow the kernel to be built while the
 695 #   maintainers work out what went wrong with kallsyms.
 696
 697 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 698 last_kallsyms := 3
 699 else
 700 last_kallsyms := 2
 701 endif
 702
 703 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 704
 705 define verify_kallsyms
 706         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 707           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 708           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 709         $(Q)cmp -s System.map .tmp_System.map ||                             \
 710                 (echo Inconsistent kallsyms data;                            \
 711                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 712                  rm .tmp_kallsyms* ; /bin/false )
 713 endef
 714
 715 # Update vmlinux version before link
 716 # Use + in front of this rule to silent warning about make -j1
 717 # First command is ':' to allow us to use + in front of this rule
 718 cmd_ksym_ld = $(cmd_vmlinux__)
 719 define rule_ksym_ld
 720         :
 721         +$(call cmd,vmlinux_version)
 722         $(call cmd,vmlinux__)
 723         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 724 endef
 725
 726 # Generate .S file with all kernel symbols
 727 quiet_cmd_kallsyms = KSYM    $@
 728       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 729                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 730
 731 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 732         $(call if_changed_dep,as_o_S)
 733
 734 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 735         $(call cmd,kallsyms)
 736
 737 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 738 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 739         $(call if_changed_rule,ksym_ld)
 740
 741 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 742         $(call if_changed,vmlinux__)
 743
 744 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 745         $(call if_changed,vmlinux__)
 746
 747 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 748 $(KALLSYMS): scripts ;
 749
 750 # Generate some data for debugging strange kallsyms problems
 751 debug_kallsyms: .tmp_map$(last_kallsyms)
 752
 753 .tmp_map%: .tmp_vmlinux% FORCE
 754         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 755
 756 .tmp_map3: .tmp_map2
 757
 758 .tmp_map2: .tmp_map1
 759
 760 endif # ifdef CONFIG_KALLSYMS
 761
 762 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 763 # relevant sections renamed as per the linker script.
 764 quiet_cmd_vmlinux-modpost = LD      $@
 765       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 766          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 767          $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
 768 define rule_vmlinux-modpost
 769         :
 770         +$(call cmd,vmlinux-modpost)
 771         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 772         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 773 endef
 774
 775 # vmlinux image - including updated kernel symbols
 776 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
 777 ifdef CONFIG_HEADERS_CHECK
 778         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 779 endif
 780 ifdef CONFIG_SAMPLES
 781         $(Q)$(MAKE) $(build)=samples
 782 endif
 783         $(call vmlinux-modpost)
 784         $(call if_changed_rule,vmlinux__)
 785         $(Q)rm -f .old_version
 786
 787 vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 788         $(call if_changed_rule,vmlinux-modpost)
 789
 790 # The actual objects are generated when descending,
 791 # make sure no implicit rule kicks in
 792 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 793
 794 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 795 # Preset locale variables to speed up the build process. Limit locale
 796 # tweaks to this spot to avoid wrong language settings when running
 797 # make menuconfig etc.
 798 # Error messages still appears in the original language
 799
 800 PHONY += $(vmlinux-dirs)
 801 $(vmlinux-dirs): prepare scripts
 802         $(Q)$(MAKE) $(build)=$@
 803
 804 # Build the kernel release string
 805 #
 806 # The KERNELRELEASE value built here is stored in the file
 807 # include/config/kernel.release, and is used when executing several
 808 # make targets, such as "make install" or "make modules_install."
 809 #
 810 # The eventual kernel release string consists of the following fields,
 811 # shown in a hierarchical format to show how smaller parts are concatenated
 812 # to form the larger and final value, with values coming from places like
 813 # the Makefile, kernel config options, make command line options and/or
 814 # SCM tag information.
 815 #
 816 #       $(KERNELVERSION)
 817 #         $(VERSION)                    eg, 2
 818 #         $(PATCHLEVEL)                 eg, 6
 819 #         $(SUBLEVEL)                   eg, 18
 820 #         $(EXTRAVERSION)               eg, -rc6
 821 #       $(localver-full)
 822 #         $(localver)
 823 #           localversion*               (files without backups, containing '~')
 824 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 825 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 826 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 827 #           $(LOCALVERSION)             (from make command line if provided)
 828 #
 829 #  Note how the final $(localver-auto) string is included *only* if the
 830 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 831 # moment, only git is supported but other SCMs can edit the script
 832 # scripts/setlocalversion and add the appropriate checks as needed.
 833
 834 pattern = ".*/localversion[^~]*"
 835 string  = $(shell cat /dev/null \
 836            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 837
 838 localver = $(subst $(space),, $(string) \
 839                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 840
 841 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 842 # and if the SCM is know a tag from the SCM is appended.
 843 # The appended tag is determined by the SCM used.
 844 #
 845 # Currently, only git is supported.
 846 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 847 # checks as needed.
 848 ifdef CONFIG_LOCALVERSION_AUTO
 849         _localver-auto = $(shell $(CONFIG_SHELL) \
 850                           $(srctree)/scripts/setlocalversion $(srctree))
 851         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 852 endif
 853
 854 localver-full = $(localver)$(localver-auto)
 855
 856 # Store (new) KERNELRELASE string in include/config/kernel.release
 857 kernelrelease = $(KERNELVERSION)$(localver-full)
 858 include/config/kernel.release: include/config/auto.conf FORCE
 859         $(Q)rm -f $@
 860         $(Q)echo $(kernelrelease) > $@
 861
 862
 863 # Things we need to do before we recursively start building the kernel
 864 # or the modules are listed in "prepare".
 865 # A multi level approach is used. prepareN is processed before prepareN-1.
 866 # archprepare is used in arch Makefiles and when processed asm symlink,
 867 # version.h and scripts_basic is processed / created.
 868
 869 # Listed in dependency order
 870 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 871
 872 # prepare3 is used to check if we are building in a separate output directory,
 873 # and if so do:
 874 # 1) Check that make has not been executed in the kernel src $(srctree)
 875 # 2) Create the include2 directory, used for the second asm symlink
 876 prepare3: include/config/kernel.release
 877 ifneq ($(KBUILD_SRC),)
 878         @echo '  Using $(srctree) as source for kernel'
 879         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 880                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 881                 echo "  in the '$(srctree)' directory.";\
 882                 /bin/false; \
 883         fi;
 884         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 885         $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
 886 endif
 887
 888 # prepare2 creates a makefile if using a separate output directory
 889 prepare2: prepare3 outputmakefile
 890
 891 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 892                    include/asm include/config/auto.conf
 893         $(cmd_crmodverdir)
 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 # The asm symlink changes when $(ARCH) changes.
 910 # Detect this and ask user to run make mrproper
 911
 912 include/asm: FORCE
 913         $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`;   \
 914         if [ -L include/asm ]; then                                     \
 915                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                \
 916                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 917                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 918                         exit 1;                                         \
 919                 fi;                                                     \
 920         else                                                            \
 921                 echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';          \
 922                 if [ ! -d include ]; then                               \
 923                         mkdir -p include;                               \
 924                 fi;                                                     \
 925                 ln -fsn asm-$(SRCARCH) $@;                              \
 926         fi
 927
 928 # Generate some files
 929 # ---------------------------------------------------------------------------
 930
 931 # KERNELRELEASE can change from a few different places, meaning version.h
 932 # needs to be updated, so this check is forced on all builds
 933
 934 uts_len := 64
 935 define filechk_utsrelease.h
 936         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 937           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 938           exit 1;                                                         \
 939         fi;                                                               \
 940         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 941 endef
 942
 943 define filechk_version.h
 944         (echo \#define LINUX_VERSION_CODE $(shell                             \
 945         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 946         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 947 endef
 948
 949 include/linux/version.h: $(srctree)/Makefile FORCE
 950         $(call filechk,version.h)
 951
 952 include/linux/utsrelease.h: include/config/kernel.release FORCE
 953         $(call filechk,utsrelease.h)
 954
 955 # ---------------------------------------------------------------------------
 956
 957 PHONY += depend dep
 958 depend dep:
 959         @echo '*** Warning: make $@ is unnecessary now.'
 960
 961 # ---------------------------------------------------------------------------
 962 # Kernel headers
 963 INSTALL_HDR_PATH=$(objtree)/usr
 964 export INSTALL_HDR_PATH
 965
 966 HDRFILTER=generic i386 x86_64
 967 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
 968
 969 PHONY += headers_install_all
 970 headers_install_all: include/linux/version.h scripts_basic FORCE
 971         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
 972         $(Q)for arch in $(HDRARCHES); do \
 973          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
 974          done
 975
 976 PHONY += headers_install
 977 headers_install: include/linux/version.h scripts_basic FORCE
 978         @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
 979           echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
 980           exit 1 ; fi
 981         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
 982         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
 983
 984 PHONY += headers_check_all
 985 headers_check_all: headers_install_all
 986         $(Q)for arch in $(HDRARCHES); do \
 987          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
 988          done
 989
 990 PHONY += headers_check
 991 headers_check: headers_install
 992         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
 993
 994 # ---------------------------------------------------------------------------
 995 # Modules
 996
 997 ifdef CONFIG_MODULES
 998
 999 # By default, build modules as well
1000
1001 all: modules
1002
1003 #       Build modules
1004
1005 PHONY += modules
1006 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1007         @echo '  Building modules, stage 2.';
1008         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1009
1010
1011 # Target to prepare building external modules
1012 PHONY += modules_prepare
1013 modules_prepare: prepare scripts
1014
1015 # Target to install modules
1016 PHONY += modules_install
1017 modules_install: _modinst_ _modinst_post
1018
1019 PHONY += _modinst_
1020 _modinst_:
1021         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1022                 echo "Warning: you may need to install module-init-tools"; \
1023                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1024                 sleep 1; \
1025         fi
1026         @rm -rf $(MODLIB)/kernel
1027         @rm -f $(MODLIB)/source
1028         @mkdir -p $(MODLIB)/kernel
1029         @ln -s $(srctree) $(MODLIB)/source
1030         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1031                 rm -f $(MODLIB)/build ; \
1032                 ln -s $(objtree) $(MODLIB)/build ; \
1033         fi
1034         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1035
1036 # This depmod is only for convenience to give the initial
1037 # boot a modules.dep even before / is mounted read-write.  However the
1038 # boot script depmod is the master version.
1039 PHONY += _modinst_post
1040 _modinst_post: _modinst_
1041         $(call cmd,depmod)
1042
1043 else # CONFIG_MODULES
1044
1045 # Modules not configured
1046 # ---------------------------------------------------------------------------
1047
1048 modules modules_install: FORCE
1049         @echo
1050         @echo "The present kernel configuration has modules disabled."
1051         @echo "Type 'make config' and enable loadable module support."
1052         @echo "Then build a kernel with module support enabled."
1053         @echo
1054         @exit 1
1055
1056 endif # CONFIG_MODULES
1057
1058 ###
1059 # Cleaning is done on three levels.
1060 # make clean     Delete most generated files
1061 #                Leave enough to build external modules
1062 # make mrproper  Delete the current configuration, and all generated files
1063 # make distclean Remove editor backup files, patch leftover files and the like
1064
1065 # Directories & files removed with 'make clean'
1066 CLEAN_DIRS  += $(MODVERDIR)
1067 CLEAN_FILES +=  vmlinux System.map \
1068                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1069
1070 # Directories & files removed with 'make mrproper'
1071 MRPROPER_DIRS  += include/config include2 usr/include
1072 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1073                   include/linux/autoconf.h include/linux/version.h      \
1074                   include/linux/utsrelease.h                            \
1075                   Module.symvers tags TAGS cscope*
1076
1077 # clean - Delete most, but leave enough to build external modules
1078 #
1079 clean: rm-dirs  := $(CLEAN_DIRS)
1080 clean: rm-files := $(CLEAN_FILES)
1081 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1082
1083 PHONY += $(clean-dirs) clean archclean
1084 $(clean-dirs):
1085         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1086
1087 clean: archclean $(clean-dirs)
1088         $(call cmd,rmdirs)
1089         $(call cmd,rmfiles)
1090         @find . $(RCS_FIND_IGNORE) \
1091                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1092                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1093                 -o -name '*.symtypes' \) \
1094                 -type f -print | xargs rm -f
1095
1096 # mrproper - Delete all generated files, including .config
1097 #
1098 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1099 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1100 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1101
1102 PHONY += $(mrproper-dirs) mrproper archmrproper
1103 $(mrproper-dirs):
1104         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1105
1106 mrproper: clean archmrproper $(mrproper-dirs)
1107         $(call cmd,rmdirs)
1108         $(call cmd,rmfiles)
1109
1110 # distclean
1111 #
1112 PHONY += distclean
1113
1114 distclean: mrproper
1115         @find $(srctree) $(RCS_FIND_IGNORE) \
1116                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1117                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1118                 -o -name '.*.rej' -o -size 0 \
1119                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1120                 -type f -print | xargs rm -f
1121
1122
1123 # Packaging of the kernel to various formats
1124 # ---------------------------------------------------------------------------
1125 # rpm target kept for backward compatibility
1126 package-dir     := $(srctree)/scripts/package
1127
1128 %pkg: include/config/kernel.release FORCE
1129         $(Q)$(MAKE) $(build)=$(package-dir) $@
1130 rpm: include/config/kernel.release FORCE
1131         $(Q)$(MAKE) $(build)=$(package-dir) $@
1132
1133
1134 # Brief documentation of the typical targets used
1135 # ---------------------------------------------------------------------------
1136
1137 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1138 boards := $(notdir $(boards))
1139
1140 help:
1141         @echo  'Cleaning targets:'
1142         @echo  '  clean           - Remove most generated files but keep the config and'
1143         @echo  '                    enough build support to build external modules'
1144         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1145         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1146         @echo  ''
1147         @echo  'Configuration targets:'
1148         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1149         @echo  ''
1150         @echo  'Other generic targets:'
1151         @echo  '  all             - Build all targets marked with [*]'
1152         @echo  '* vmlinux         - Build the bare kernel'
1153         @echo  '* modules         - Build all modules'
1154         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1155         @echo  '  dir/            - Build all files in dir and below'
1156         @echo  '  dir/file.[ois]  - Build specified target only'
1157         @echo  '  dir/file.ko     - Build module including final link'
1158         @echo  '  rpm             - Build a kernel as an RPM package'
1159         @echo  '  tags/TAGS       - Generate tags file for editors'
1160         @echo  '  cscope          - Generate cscope index'
1161         @echo  '  kernelrelease   - Output the release version string'
1162         @echo  '  kernelversion   - Output the version stored in Makefile'
1163         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1164          echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1165          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1166          fi
1167         @echo  ''
1168         @echo  'Static analysers'
1169         @echo  '  checkstack      - Generate a list of stack hogs'
1170         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1171         @echo  '  export_report   - List the usages of all exported symbols'
1172         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1173          echo  '  headers_check   - Sanity check on exported headers'; \
1174          fi
1175         @echo  ''
1176         @echo  'Kernel packaging:'
1177         @$(MAKE) $(build)=$(package-dir) help
1178         @echo  ''
1179         @echo  'Documentation targets:'
1180         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1181         @echo  ''
1182         @echo  'Architecture specific targets ($(ARCH)):'
1183         @$(if $(archhelp),$(archhelp),\
1184                 echo '  No architecture specific help defined for $(ARCH)')
1185         @echo  ''
1186         @$(if $(boards), \
1187                 $(foreach b, $(boards), \
1188                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1189                 echo '')
1190
1191         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1192         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1193         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1194         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1195         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1196         @echo  ''
1197         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1198         @echo  'For further info see the ./README file'
1199
1200
1201 # Documentation targets
1202 # ---------------------------------------------------------------------------
1203 %docs: scripts_basic FORCE
1204         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1205
1206 else # KBUILD_EXTMOD
1207
1208 ###
1209 # External module support.
1210 # When building external modules the kernel used as basis is considered
1211 # read-only, and no consistency checks are made and the make
1212 # system is not used on the basis kernel. If updates are required
1213 # in the basis kernel ordinary make commands (without M=...) must
1214 # be used.
1215 #
1216 # The following are the only valid targets when building external
1217 # modules.
1218 # make M=dir clean     Delete all automatically generated files
1219 # make M=dir modules   Make all modules in specified dir
1220 # make M=dir           Same as 'make M=dir modules'
1221 # make M=dir modules_install
1222 #                      Install the modules built in the module directory
1223 #                      Assumes install directory is already created
1224
1225 # We are always building modules
1226 KBUILD_MODULES := 1
1227 PHONY += crmodverdir
1228 crmodverdir:
1229         $(cmd_crmodverdir)
1230
1231 PHONY += $(objtree)/Module.symvers
1232 $(objtree)/Module.symvers:
1233         @test -e $(objtree)/Module.symvers || ( \
1234         echo; \
1235         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1236         echo "           is missing; modules will have no dependencies and modversions."; \
1237         echo )
1238
1239 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1240 PHONY += $(module-dirs) modules
1241 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1242         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1243
1244 modules: $(module-dirs)
1245         @echo '  Building modules, stage 2.';
1246         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1247
1248 PHONY += modules_install
1249 modules_install: _emodinst_ _emodinst_post
1250
1251 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1252 PHONY += _emodinst_
1253 _emodinst_:
1254         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1255         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1256
1257 PHONY += _emodinst_post
1258 _emodinst_post: _emodinst_
1259         $(call cmd,depmod)
1260
1261 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1262
1263 PHONY += $(clean-dirs) clean
1264 $(clean-dirs):
1265         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1266
1267 clean:  rm-dirs := $(MODVERDIR)
1268 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1269 clean: $(clean-dirs)
1270         $(call cmd,rmdirs)
1271         $(call cmd,rmfiles)
1272         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1273                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1274                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1275                 -type f -print | xargs rm -f
1276
1277 help:
1278         @echo  '  Building external modules.'
1279         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1280         @echo  ''
1281         @echo  '  modules         - default target, build the module(s)'
1282         @echo  '  modules_install - install the module'
1283         @echo  '  clean           - remove generated files in module directory only'
1284         @echo  ''
1285
1286 # Dummies...
1287 PHONY += prepare scripts
1288 prepare: ;
1289 scripts: ;
1290 endif # KBUILD_EXTMOD
1291
1292 # Generate tags for editors
1293 # ---------------------------------------------------------------------------
1294
1295 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1296 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1297 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1298
1299 ifeq ($(src),$(obj))
1300 __srctree =
1301 else
1302 __srctree = $(srctree)/
1303 endif
1304
1305 ifeq ($(ALLSOURCE_ARCHS),)
1306 ifeq ($(ARCH),um)
1307 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1308 else
1309 ALLINCLUDE_ARCHS := $(SRCARCH)
1310 endif
1311 else
1312 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1313 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1314 endif
1315
1316 # Take care of arch/x86
1317 ifeq ($(ARCH), $(SRCARCH))
1318 ALLSOURCE_ARCHS := $(ARCH)
1319 else
1320 ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
1321 endif
1322
1323 define find-sources
1324         ( for arch in $(ALLSOURCE_ARCHS) ; do \
1325                find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1326                     -name $1 -print; \
1327           done ; \
1328           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1329                -name $1 -print; \
1330           find $(__srctree)include $(RCS_FIND_IGNORE) \
1331                \( -name config -o -name 'asm-*' \) -prune \
1332                -o -name $1 -print; \
1333           for arch in $(ALLINCLUDE_ARCHS) ; do \
1334                find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1335                     -name $1 -print; \
1336           done ; \
1337           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1338                -name $1 -print; \
1339           find $(__srctree) $(RCS_FIND_IGNORE) \
1340                \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1341                -name $1 -print; \
1342           )
1343 endef
1344
1345 define all-sources
1346         $(call find-sources,'*.[chS]')
1347 endef
1348 define all-kconfigs
1349         $(call find-sources,'Kconfig*')
1350 endef
1351 define all-defconfigs
1352         $(call find-sources,'defconfig')
1353 endef
1354
1355 define xtags
1356         if $1 --version 2>&1 | grep -iq exuberant; then \
1357             $(all-sources) | xargs $1 -a \
1358                 -I __initdata,__exitdata,__acquires,__releases \
1359                 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1360                 --extra=+f --c-kinds=+px \
1361                 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1362             $(all-kconfigs) | xargs $1 -a \
1363                 --langdef=kconfig \
1364                 --language-force=kconfig \
1365                 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1366             $(all-defconfigs) | xargs -r $1 -a \
1367                 --langdef=dotconfig \
1368                 --language-force=dotconfig \
1369                 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1370         elif $1 --version 2>&1 | grep -iq emacs; then \
1371             $(all-sources) | xargs $1 -a; \
1372             $(all-kconfigs) | xargs $1 -a \
1373                 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1374             $(all-defconfigs) | xargs -r $1 -a \
1375                 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1376         else \
1377             $(all-sources) | xargs $1 -a; \
1378         fi
1379 endef
1380
1381 quiet_cmd_cscope-file = FILELST cscope.files
1382       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1383
1384 quiet_cmd_cscope = MAKE    cscope.out
1385       cmd_cscope = cscope -b
1386
1387 cscope: FORCE
1388         $(call cmd,cscope-file)
1389         $(call cmd,cscope)
1390
1391 quiet_cmd_TAGS = MAKE   $@
1392 define cmd_TAGS
1393         rm -f $@; \
1394         $(call xtags,etags)
1395 endef
1396
1397 TAGS: FORCE
1398         $(call cmd,TAGS)
1399
1400 quiet_cmd_tags = MAKE   $@
1401 define cmd_tags
1402         rm -f $@; \
1403         $(call xtags,ctags)
1404 endef
1405
1406 tags: FORCE
1407         $(call cmd,tags)
1408
1409
1410 # Scripts to check various things for consistency
1411 # ---------------------------------------------------------------------------
1412
1413 includecheck:
1414         find * $(RCS_FIND_IGNORE) \
1415                 -name '*.[hcS]' -type f -print | sort \
1416                 | xargs $(PERL) -w scripts/checkincludes.pl
1417
1418 versioncheck:
1419         find * $(RCS_FIND_IGNORE) \
1420                 -name '*.[hcS]' -type f -print | sort \
1421                 | xargs $(PERL) -w scripts/checkversion.pl
1422
1423 namespacecheck:
1424         $(PERL) $(srctree)/scripts/namespace.pl
1425
1426 export_report:
1427         $(PERL) $(srctree)/scripts/export_report.pl
1428
1429 endif #ifeq ($(config-targets),1)
1430 endif #ifeq ($(mixed-targets),1)
1431
1432 PHONY += checkstack kernelrelease kernelversion
1433
1434 # UML needs a little special treatment here.  It wants to use the host
1435 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1436 # else wants $(ARCH), including people doing cross-builds, which means
1437 # that $(SUBARCH) doesn't work here.
1438 ifeq ($(ARCH), um)
1439 CHECKSTACK_ARCH := $(SUBARCH)
1440 else
1441 CHECKSTACK_ARCH := $(ARCH)
1442 endif
1443 checkstack:
1444         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1445         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1446
1447 kernelrelease:
1448         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1449         $(error kernelrelease not valid - run 'make prepare' to update it))
1450 kernelversion:
1451         @echo $(KERNELVERSION)
1452
1453 # Single targets
1454 # ---------------------------------------------------------------------------
1455 # Single targets are compatible with:
1456 # - build whith mixed source and output
1457 # - build with separate output dir 'make O=...'
1458 # - external modules
1459 #
1460 #  target-dir => where to store outputfile
1461 #  build-dir  => directory in kernel source tree to use
1462
1463 ifeq ($(KBUILD_EXTMOD),)
1464         build-dir  = $(patsubst %/,%,$(dir $@))
1465         target-dir = $(dir $@)
1466 else
1467         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1468         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1469         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1470 endif
1471
1472 %.s: %.c prepare scripts FORCE
1473         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1474 %.i: %.c prepare scripts FORCE
1475         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1476 %.o: %.c prepare scripts FORCE
1477         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1478 %.lst: %.c prepare scripts FORCE
1479         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1480 %.s: %.S prepare scripts FORCE
1481         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1482 %.o: %.S prepare scripts FORCE
1483         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1484 %.symtypes: %.c prepare scripts FORCE
1485         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1486
1487 # Modules
1488 / %/: prepare scripts FORCE
1489         $(cmd_crmodverdir)
1490         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1491         $(build)=$(build-dir)
1492 %.ko: prepare scripts FORCE
1493         $(cmd_crmodverdir)
1494         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1495         $(build)=$(build-dir) $(@:.ko=.o)
1496         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1497
1498 # FIXME Should go into a make.lib or something
1499 # ===========================================================================
1500
1501 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1502       cmd_rmdirs = rm -rf $(rm-dirs)
1503
1504 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1505       cmd_rmfiles = rm -f $(rm-files)
1506
1507 # Run depmod only is we have System.map and depmod is executable
1508 # and we build for the host arch
1509 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1510       cmd_depmod = \
1511         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1512                 $(DEPMOD) -ae -F System.map                                     \
1513                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1514                 $(KERNELRELEASE);                                               \
1515         fi
1516
1517 # Create temporary dir for module support files
1518 # clean it up only when building all modules
1519 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1520                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1521
1522 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1523           $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1524           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1525
1526 quiet_cmd_as_o_S = AS      $@
1527 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1528
1529 # read all saved command lines
1530
1531 targets := $(wildcard $(sort $(targets)))
1532 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1533
1534 ifneq ($(cmd_files),)
1535   $(cmd_files): ;       # Do not try to update included dependency files
1536   include $(cmd_files)
1537 endif
1538
1539 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1540 # Usage:
1541 # $(Q)$(MAKE) $(clean)=dir
1542 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1543
1544 endif   # skip-makefile
1545
1546 PHONY += FORCE
1547 FORCE:
1548
1549 # Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1550 Makefile: ;
1551
1552 # Declare the contents of the .PHONY variable as phony.  We keep that
1553 # information in a variable se we can use it in if_changed and friends.
1554 .PHONY: $(PHONY)