release/src/router/busybox/Makefile

   1 VERSION = 1
   2 PATCHLEVEL = 14
   3 SUBLEVEL = 4
   4 EXTRAVERSION =
   5 NAME = Unnamed
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # Do not print "Entering directory ..."
  14 MAKEFLAGS += --no-print-directory
  15
  16 # We are using a recursive build, so we need to do a little thinking
  17 # to get the ordering right.
  18 #
  19 # Most importantly: sub-Makefiles should only ever modify files in
  20 # their own directory. If in some directory we have a dependency on
  21 # a file in another dir (which doesn't happen often, but it's often
  22 # unavoidable when linking the built-in.o targets which finally
  23 # turn into busybox), we will call a sub make in that other dir, and
  24 # after that we are sure that everything which is in that other dir
  25 # is now up to date.
  26 #
  27 # The only cases where we need to modify files which have global
  28 # effects are thus separated out and done before the recursive
  29 # descending is started. They are now explicitly listed as the
  30 # prepare rule.
  31
  32 # To put more focus on warnings, be less verbose as default
  33 # Use 'make V=1' to see the full commands
  34
  35 ifdef V
  36   ifeq ("$(origin V)", "command line")
  37     KBUILD_VERBOSE = $(V)
  38   endif
  39 endif
  40 ifndef KBUILD_VERBOSE
  41   KBUILD_VERBOSE = 0
  42 endif
  43
  44 # Call sparse as part of compilation of C files
  45 # Use 'make C=1' to enable sparse checking
  46
  47 ifdef C
  48   ifeq ("$(origin C)", "command line")
  49     KBUILD_CHECKSRC = $(C)
  50   endif
  51 endif
  52 ifndef KBUILD_CHECKSRC
  53   KBUILD_CHECKSRC = 0
  54 endif
  55
  56 # Use make M=dir to specify directory of external module to build
  57 # Old syntax make ... SUBDIRS=$PWD is still supported
  58 # Setting the environment variable KBUILD_EXTMOD take precedence
  59 ifdef SUBDIRS
  60   KBUILD_EXTMOD ?= $(SUBDIRS)
  61 endif
  62 ifdef M
  63   ifeq ("$(origin M)", "command line")
  64     KBUILD_EXTMOD := $(M)
  65   endif
  66 endif
  67
  68
  69 # kbuild supports saving output files in a separate directory.
  70 # To locate output files in a separate directory two syntaxes are supported.
  71 # In both cases the working directory must be the root of the kernel src.
  72 # 1) O=
  73 # Use "make O=dir/to/store/output/files/"
  74 #
  75 # 2) Set KBUILD_OUTPUT
  76 # Set the environment variable KBUILD_OUTPUT to point to the directory
  77 # where the output files shall be placed.
  78 # export KBUILD_OUTPUT=dir/to/store/output/files/
  79 # make
  80 #
  81 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  82 # variable.
  83
  84
  85 # KBUILD_SRC is set on invocation of make in OBJ directory
  86 # KBUILD_SRC is not intended to be used by the regular user (for now)
  87 ifeq ($(KBUILD_SRC),)
  88
  89 # OK, Make called in directory where kernel src resides
  90 # Do we want to locate output files in a separate directory?
  91 ifdef O
  92   ifeq ("$(origin O)", "command line")
  93     KBUILD_OUTPUT := $(O)
  94   endif
  95 endif
  96
  97 # That's our default target when none is given on the command line
  98 PHONY := _all
  99 _all:
 100
 101 ifneq ($(KBUILD_OUTPUT),)
 102 # Invoke a second make in the output directory, passing relevant variables
 103 # check that the output directory actually exists
 104 saved-output := $(KBUILD_OUTPUT)
 105 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 106 $(if $(KBUILD_OUTPUT),, \
 107      $(error output directory "$(saved-output)" does not exist))
 108
 109 PHONY += $(MAKECMDGOALS)
 110
 111 $(filter-out _all,$(MAKECMDGOALS)) _all:
 112         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 113         KBUILD_SRC=$(CURDIR) \
 114         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
 115
 116 # Leave processing to above invocation of make
 117 skip-makefile := 1
 118 endif # ifneq ($(KBUILD_OUTPUT),)
 119 endif # ifeq ($(KBUILD_SRC),)
 120
 121 # We process the rest of the Makefile if this is the final invocation of make
 122 ifeq ($(skip-makefile),)
 123
 124 # If building an external module we do not care about the all: rule
 125 # but instead _all depend on modules
 126 PHONY += all
 127 ifeq ($(KBUILD_EXTMOD),)
 128 _all: all
 129 else
 130 _all: modules
 131 endif
 132
 133 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 134 TOPDIR          := $(srctree)
 135 # FIXME - TOPDIR is obsolete, use srctree/objtree
 136 objtree         := $(CURDIR)
 137 src             := $(srctree)
 138 obj             := $(objtree)
 139
 140 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 141
 142 export srctree objtree VPATH TOPDIR
 143
 144
 145 # Cross compiling and selecting different set of gcc/bin-utils
 146 # ---------------------------------------------------------------------------
 147 #
 148 # When performing cross compilation for other architectures ARCH shall be set
 149 # to the target architecture. (See arch/* for the possibilities).
 150 # ARCH can be set during invocation of make:
 151 # make ARCH=ia64
 152 # Another way is to have ARCH set in the environment.
 153 # The default ARCH is the host where make is executed.
 154
 155 # CROSS_COMPILE specify the prefix used for all executables used
 156 # during compilation. Only gcc and related bin-utils executables
 157 # are prefixed with $(CROSS_COMPILE).
 158 # CROSS_COMPILE can be set on the command line
 159 # make CROSS_COMPILE=ia64-linux-
 160 # Alternatively CROSS_COMPILE can be set in the environment.
 161 # Default value for CROSS_COMPILE is not to prefix executables
 162 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 163
 164 CROSS_COMPILE ?=
 165 # bbox: we may have CONFIG_CROSS_COMPILER_PREFIX in .config,
 166 # and it has not been included yet... thus using an awkward syntax.
 167 ifeq ($(CROSS_COMPILE),)
 168 CROSS_COMPILE := $(shell grep ^CONFIG_CROSS_COMPILER_PREFIX .config 2>/dev/null)
 169 CROSS_COMPILE := $(subst CONFIG_CROSS_COMPILER_PREFIX=,,$(CROSS_COMPILE))
 170 CROSS_COMPILE := $(subst ",,$(CROSS_COMPILE))
 171 #")
 172 endif
 173
 174 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 175 # first, and if a usermode build is happening, the "ARCH=um" on the command
 176 # line overrides the setting of ARCH below.  If a native build is happening,
 177 # then ARCH is assigned, getting whatever value it gets normally, and
 178 # SUBARCH is subsequently ignored.
 179
 180 ifneq ($(CROSS_COMPILE),)
 181 SUBARCH := $(shell echo $(CROSS_COMPILE) | cut -d- -f1)
 182 else
 183 SUBARCH := $(shell uname -m)
 184 endif
 185 SUBARCH := $(shell echo $(SUBARCH) | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 186                                          -e s/arm.*/arm/ -e s/sa110/arm/ \
 187                                          -e s/s390x/s390/ -e s/parisc64/parisc/ \
 188                                          -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
 189
 190 ARCH ?= $(SUBARCH)
 191
 192 # Architecture as present in compile.h
 193 UTS_MACHINE := $(ARCH)
 194
 195 # SHELL used by kbuild
 196 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 197           else if [ -x /bin/bash ]; then echo /bin/bash; \
 198           else echo sh; fi ; fi)
 199
 200 #       Decide whether to build built-in, modular, or both.
 201 #       Normally, just do built-in.
 202
 203 KBUILD_MODULES :=
 204 KBUILD_BUILTIN := 1
 205
 206 #       If we have only "make modules", don't compile built-in objects.
 207 #       When we're building modules with modversions, we need to consider
 208 #       the built-in objects during the descend as well, in order to
 209 #       make sure the checksums are uptodate before we record them.
 210
 211 ifeq ($(MAKECMDGOALS),modules)
 212   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 213 endif
 214
 215 #       If we have "make <whatever> modules", compile modules
 216 #       in addition to whatever we do anyway.
 217 #       Just "make" or "make all" shall build modules as well
 218
 219 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 220   KBUILD_MODULES := 1
 221 endif
 222
 223 ifeq ($(MAKECMDGOALS),)
 224   KBUILD_MODULES := 1
 225 endif
 226
 227 export KBUILD_MODULES KBUILD_BUILTIN
 228 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 229
 230 # Beautify output
 231 # ---------------------------------------------------------------------------
 232 #
 233 # Normally, we echo the whole command before executing it. By making
 234 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 235 # $(quiet) to choose other forms of output instead, e.g.
 236 #
 237 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 238 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 239 #
 240 # If $(quiet) is empty, the whole command will be printed.
 241 # If it is set to "quiet_", only the short version will be printed.
 242 # If it is set to "silent_", nothing wil be printed at all, since
 243 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 244 #
 245 # A simple variant is to prefix commands with $(Q) - that's useful
 246 # for commands that shall be hidden in non-verbose mode.
 247 #
 248 #       $(Q)ln $@ :<
 249 #
 250 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 251 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 252
 253 ifeq ($(KBUILD_VERBOSE),1)
 254   quiet =
 255   Q =
 256 else
 257   quiet=quiet_
 258   Q = @
 259 endif
 260
 261 # If the user is running make -s (silent mode), suppress echoing of
 262 # commands
 263
 264 ifneq ($(findstring s,$(MAKEFLAGS)),)
 265   quiet=silent_
 266 endif
 267
 268 export quiet Q KBUILD_VERBOSE
 269
 270
 271 # Look for make include files relative to root of kernel src
 272 MAKEFLAGS += --include-dir=$(srctree)
 273
 274 HOSTCC          = gcc
 275 HOSTCXX         = g++
 276 HOSTCFLAGS      :=
 277 HOSTCXXFLAGS    :=
 278 # We need some generic definitions
 279 include $(srctree)/scripts/Kbuild.include
 280
 281 HOSTCFLAGS      += $(call hostcc-option,-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer,)
 282 HOSTCXXFLAGS    += -O2
 283
 284 # For maximum performance (+ possibly random breakage, uncomment
 285 # the following)
 286
 287 MAKEFLAGS += -rR
 288
 289 # Make variables (CC, etc...)
 290
 291 AS              = $(CROSS_COMPILE)as
 292 CC              = $(CROSS_COMPILE)gcc
 293 LD              = $(CC) -nostdlib
 294 CPP             = $(CC) -E
 295 AR              = $(CROSS_COMPILE)ar
 296 NM              = $(CROSS_COMPILE)nm
 297 STRIP           = $(CROSS_COMPILE)strip
 298 OBJCOPY         = $(CROSS_COMPILE)objcopy
 299 OBJDUMP         = $(CROSS_COMPILE)objdump
 300 AWK             = awk
 301 GENKSYMS        = scripts/genksyms/genksyms
 302 DEPMOD          = /sbin/depmod
 303 KALLSYMS        = scripts/kallsyms
 304 PERL            = perl
 305 CHECK           = sparse
 306
 307 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 308 MODFLAGS        = -DMODULE
 309 CFLAGS_MODULE   = $(MODFLAGS)
 310 AFLAGS_MODULE   = $(MODFLAGS)
 311 LDFLAGS_MODULE  = -r
 312 CFLAGS_KERNEL   =
 313 AFLAGS_KERNEL   =
 314
 315
 316 # Use LINUXINCLUDE when you must reference the include/ directory.
 317 # Needed to be compatible with the O= option
 318 CFLAGS          := $(CFLAGS)
 319 # Added only to final link stage of busybox binary
 320 CFLAGS_busybox  := $(CFLAGS_busybox)
 321 CPPFLAGS        := $(CPPFLAGS)
 322 AFLAGS          := $(AFLAGS)
 323 LDFLAGS         := $(LDFLAGS)
 324 LDLIBS          :=
 325
 326 # Read KERNELRELEASE from .kernelrelease (if it exists)
 327 KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
 328 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 329
 330 export  VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
 331         ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 332         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 333         HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 334
 335 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 336 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 337 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 338 export FLTFLAGS
 339
 340 # When compiling out-of-tree modules, put MODVERDIR in the module
 341 # tree rather than in the kernel tree. The kernel tree might
 342 # even be read-only.
 343 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 344
 345 # Files to ignore in find ... statements
 346
 347 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
 348 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 349
 350 # ===========================================================================
 351 # Rules shared between *config targets and build targets
 352
 353 # Basic helpers built in scripts/
 354 PHONY += scripts_basic
 355 scripts_basic:
 356         $(Q)$(MAKE) $(build)=scripts/basic
 357
 358 # To avoid any implicit rule to kick in, define an empty command.
 359 scripts/basic/%: scripts_basic ;
 360
 361 PHONY += outputmakefile
 362 # outputmakefile generates a Makefile in the output directory, if using a
 363 # separate output directory. This allows convenient use of make in the
 364 # output directory.
 365 outputmakefile:
 366 ifneq ($(KBUILD_SRC),)
 367         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 368             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 369 endif
 370
 371 # To make sure we do not include .config for any of the *config targets
 372 # catch them early, and hand them over to scripts/kconfig/Makefile
 373 # It is allowed to specify more targets when calling make, including
 374 # mixing *config targets and build targets.
 375 # For example 'make oldconfig all'.
 376 # Detect when mixed targets is specified, and make a second invocation
 377 # of make so .config is not included in this case either (for *config).
 378
 379 no-dot-config-targets := clean mrproper distclean \
 380                          cscope TAGS tags help %docs
 381 #bbox# check% is removed from above
 382
 383 config-targets := 0
 384 mixed-targets  := 0
 385 dot-config     := 1
 386
 387 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 388         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 389                 dot-config := 0
 390         endif
 391 endif
 392
 393 ifeq ($(KBUILD_EXTMOD),)
 394         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 395                 config-targets := 1
 396                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 397                         mixed-targets := 1
 398                 endif
 399         endif
 400 endif
 401
 402 ifeq ($(mixed-targets),1)
 403 # ===========================================================================
 404 # We're called with mixed targets (*config and build targets).
 405 # Handle them one by one.
 406
 407 %:: FORCE
 408         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 409
 410 else
 411 ifeq ($(config-targets),1)
 412 # ===========================================================================
 413 # *config targets only - make sure prerequisites are updated, and descend
 414 # in scripts/kconfig to make the *config target
 415
 416 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 417 # KBUILD_DEFCONFIG may point out an alternative default configuration
 418 # used for 'make defconfig'
 419 -include $(srctree)/arch/$(ARCH)/Makefile
 420 export KBUILD_DEFCONFIG
 421
 422 config %config: scripts_basic outputmakefile FORCE
 423         $(Q)mkdir -p include
 424         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 425         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
 426
 427 else
 428 # ===========================================================================
 429 # Build targets only - this includes busybox, arch specific targets, clean
 430 # targets and others. In general all targets except *config targets.
 431
 432 ifeq ($(KBUILD_EXTMOD),)
 433 # Additional helpers built in scripts/
 434 # Carefully list dependencies so we do not try to build scripts twice
 435 # in parrallel
 436 PHONY += scripts
 437 scripts: scripts_basic include/config/MARKER
 438         $(Q)$(MAKE) $(build)=$(@)
 439
 440 scripts_basic: include/autoconf.h
 441
 442 # Objects we will link into busybox / subdirs we need to visit
 443 core-y          := \
 444                 applets/ \
 445
 446 libs-y          := \
 447                 archival/ \
 448                 archival/libunarchive/ \
 449                 console-tools/ \
 450                 coreutils/ \
 451                 coreutils/libcoreutils/ \
 452                 debianutils/ \
 453                 e2fsprogs/old_e2fsprogs/ \
 454                 e2fsprogs/old_e2fsprogs/blkid/ \
 455                 e2fsprogs/old_e2fsprogs/e2p/ \
 456                 e2fsprogs/old_e2fsprogs/ext2fs/ \
 457                 e2fsprogs/old_e2fsprogs/uuid/ \
 458                 editors/ \
 459                 findutils/ \
 460                 init/ \
 461                 libbb/ \
 462                 libpwdgrp/ \
 463                 loginutils/ \
 464                 mailutils/ \
 465                 miscutils/ \
 466                 modutils/ \
 467                 networking/ \
 468                 networking/libiproute/ \
 469                 networking/udhcp/ \
 470                 printutils/ \
 471                 procps/ \
 472                 runit/ \
 473                 selinux/ \
 474                 shell/ \
 475                 sysklogd/ \
 476                 util-linux/ \
 477                 util-linux/volume_id/ \
 478
 479 endif # KBUILD_EXTMOD
 480
 481 ifeq ($(dot-config),1)
 482 # In this section, we need .config
 483
 484 # Read in dependencies to all Kconfig* files, make sure to run
 485 # oldconfig if changes are detected.
 486 -include .kconfig.d
 487
 488 -include .config
 489
 490 # If .config needs to be updated, it will be done via the dependency
 491 # that autoconf has on .config.
 492 # To avoid any implicit rule to kick in, define an empty command
 493 .config .kconfig.d: ;
 494
 495 # Now we can define CFLAGS etc according to .config
 496 include $(srctree)/Makefile.flags
 497
 498 # If .config is newer than include/autoconf.h, someone tinkered
 499 # with it and forgot to run make oldconfig.
 500 # If kconfig.d is missing then we are probarly in a cleaned tree so
 501 # we execute the config step to be sure to catch updated Kconfig files
 502 include/autoconf.h: .kconfig.d .config
 503         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 504
 505 else
 506 # Dummy target needed, because used as prerequisite
 507 include/autoconf.h: ;
 508 endif
 509
 510 # The all: target is the default when no target is given on the
 511 # command line.
 512 # This allow a user to issue only 'make' to build a kernel including modules
 513 # Defaults busybox but it is usually overridden in the arch makefile
 514 all: busybox doc
 515
 516 -include $(srctree)/arch/$(ARCH)/Makefile
 517
 518 # arch Makefile may override CC so keep this after arch Makefile is included
 519 #bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 520 CHECKFLAGS += $(NOSTDINC_FLAGS)
 521
 522 # Default kernel image to build when no specific target is given.
 523 # KBUILD_IMAGE may be overruled on the commandline or
 524 # set in the environment
 525 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 526 # this default value
 527 export KBUILD_IMAGE ?= busybox
 528
 529 #
 530 # INSTALL_PATH specifies where to place the updated kernel and system map
 531 # images. Default is /boot, but you can set it to other values
 532 export  INSTALL_PATH ?= /boot
 533
 534 #
 535 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 536 # relocations required by build roots.  This is not defined in the
 537 # makefile but the arguement can be passed to make if needed.
 538 #
 539
 540 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 541 export MODLIB
 542
 543
 544 ifeq ($(KBUILD_EXTMOD),)
 545 busybox-dirs    := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
 546
 547 busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
 548                      $(core-n) $(core-) $(libs-n) $(libs-) \
 549                 )))
 550
 551 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 552 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 553 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 554 libs-y          := $(libs-y1) $(libs-y2)
 555
 556 # Build busybox
 557 # ---------------------------------------------------------------------------
 558 # busybox is build from the objects selected by $(busybox-init) and
 559 # $(busybox-main). Most are built-in.o files from top-level directories
 560 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 561 # Ordering when linking is important, and $(busybox-init) must be first.
 562 #
 563 # busybox
 564 #   ^
 565 #   |
 566 #   +-< $(busybox-init)
 567 #   |   +--< init/version.o + more
 568 #   |
 569 #   +--< $(busybox-main)
 570 #   |    +--< driver/built-in.o mm/built-in.o + more
 571 #   |
 572 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 573 #
 574 # busybox version (uname -v) cannot be updated during normal
 575 # descending-into-subdirs phase since we do not yet know if we need to
 576 # update busybox.
 577 # Therefore this step is delayed until just before final link of busybox -
 578 # except in the kallsyms case where it is done just before adding the
 579 # symbols to the kernel.
 580 #
 581 # System.map is generated to document addresses of all kernel symbols
 582
 583 busybox-all  := $(core-y) $(libs-y)
 584
 585 # Rule to link busybox - also used during CONFIG_KALLSYMS
 586 # May be overridden by arch/$(ARCH)/Makefile
 587 quiet_cmd_busybox__ ?= LINK    $@
 588       cmd_busybox__ ?= $(srctree)/scripts/trylink \
 589       "$@" \
 590       "$(CC)" \
 591       "$(CFLAGS) $(CFLAGS_busybox)" \
 592       "$(LDFLAGS) $(EXTRA_LDFLAGS)" \
 593       "$(core-y)" \
 594       "$(libs-y)" \
 595       "$(LDLIBS)"
 596
 597 # Generate System.map
 598 quiet_cmd_sysmap = SYSMAP
 599       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 600
 601 # Link of busybox
 602 # If CONFIG_KALLSYMS is set .version is already updated
 603 # Generate System.map and verify that the content is consistent
 604 # Use + in front of the busybox_version rule to silent warning with make -j2
 605 # First command is ':' to allow us to use + in front of the rule
 606 define rule_busybox__
 607         :
 608         $(call cmd,busybox__)
 609         $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
 610 endef
 611
 612
 613 ifdef CONFIG_KALLSYMS
 614 # Generate section listing all symbols and add it into busybox $(kallsyms.o)
 615 # It's a three stage process:
 616 # o .tmp_busybox1 has all symbols and sections, but __kallsyms is
 617 #   empty
 618 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 619 #   the right size - busybox version (uname -v) is updated during this step
 620 # o .tmp_busybox2 now has a __kallsyms section of the right size,
 621 #   but due to the added section, some addresses have shifted.
 622 #   From here, we generate a correct .tmp_kallsyms2.o
 623 # o The correct .tmp_kallsyms2.o is linked into the final busybox.
 624 # o Verify that the System.map from busybox matches the map from
 625 #   .tmp_busybox2, just in case we did not generate kallsyms correctly.
 626 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 627 #   .tmp_busybox3 and .tmp_kallsyms3.o.  This is only meant as a
 628 #   temporary bypass to allow the kernel to be built while the
 629 #   maintainers work out what went wrong with kallsyms.
 630
 631 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 632 last_kallsyms := 3
 633 else
 634 last_kallsyms := 2
 635 endif
 636
 637 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 638
 639 define verify_kallsyms
 640         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 641           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 642           $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
 643         $(Q)cmp -s System.map .tmp_System.map ||              \
 644                 (echo Inconsistent kallsyms data;             \
 645                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 646                  rm .tmp_kallsyms* ; /bin/false )
 647 endef
 648
 649 # Update busybox version before link
 650 # Use + in front of this rule to silent warning about make -j1
 651 # First command is ':' to allow us to use + in front of this rule
 652 cmd_ksym_ld = $(cmd_busybox__)
 653 define rule_ksym_ld
 654         :
 655         +$(call cmd,busybox_version)
 656         $(call cmd,busybox__)
 657         $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
 658 endef
 659
 660 # Generate .S file with all kernel symbols
 661 quiet_cmd_kallsyms = KSYM    $@
 662       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 663                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 664
 665 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 666         $(call if_changed_dep,as_o_S)
 667
 668 .tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
 669         $(call cmd,kallsyms)
 670
 671 # .tmp_busybox1 must be complete except kallsyms, so update busybox version
 672 .tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
 673         $(call if_changed_rule,ksym_ld)
 674
 675 .tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
 676         $(call if_changed,busybox__)
 677
 678 .tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
 679         $(call if_changed,busybox__)
 680
 681 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 682 $(KALLSYMS): scripts ;
 683
 684 # Generate some data for debugging strange kallsyms problems
 685 debug_kallsyms: .tmp_map$(last_kallsyms)
 686
 687 .tmp_map%: .tmp_busybox% FORCE
 688         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 689
 690 .tmp_map3: .tmp_map2
 691
 692 .tmp_map2: .tmp_map1
 693
 694 endif # ifdef CONFIG_KALLSYMS
 695
 696 # busybox image - including updated kernel symbols
 697 busybox_unstripped: $(busybox-all) FORCE
 698         $(call if_changed_rule,busybox__)
 699         $(Q)rm -f .old_version
 700
 701 busybox: busybox_unstripped
 702 ifeq ($(SKIP_STRIP),y)
 703         $(Q)cp $< $@
 704 else
 705         $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \
 706                 busybox_unstripped -o $@
 707 # strip is confused by PIE executable and does not set exec bits
 708         $(Q)chmod a+x $@
 709 endif
 710
 711 # The actual objects are generated when descending,
 712 # make sure no implicit rule kicks in
 713 $(sort $(busybox-all)): $(busybox-dirs) ;
 714
 715 # Handle descending into subdirectories listed in $(busybox-dirs)
 716 # Preset locale variables to speed up the build process. Limit locale
 717 # tweaks to this spot to avoid wrong language settings when running
 718 # make menuconfig etc.
 719 # Error messages still appears in the original language
 720
 721 PHONY += $(busybox-dirs)
 722 $(busybox-dirs): prepare scripts
 723         $(Q)$(MAKE) $(build)=$@
 724
 725 # Build the kernel release string
 726 # The KERNELRELEASE is stored in a file named .kernelrelease
 727 # to be used when executing for example make install or make modules_install
 728 #
 729 # Take the contents of any files called localversion* and the config
 730 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
 731 # LOCALVERSION from the command line override all of this
 732
 733 nullstring :=
 734 space      := $(nullstring) # end of line
 735
 736 ___localver = $(objtree)/localversion* $(srctree)/localversion*
 737 __localver  = $(sort $(wildcard $(___localver)))
 738 # skip backup files (containing '~')
 739 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
 740
 741 localver = $(subst $(space),, \
 742            $(shell cat /dev/null $(_localver)) \
 743            $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 744
 745 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 746 # and if the SCM is know a tag from the SCM is appended.
 747 # The appended tag is determinded by the SCM used.
 748 #
 749 # Currently, only git is supported.
 750 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 751 # checks as needed.
 752 ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO
 753         _localver-auto = $(shell $(CONFIG_SHELL) \
 754                           $(srctree)/scripts/setlocalversion $(srctree))
 755         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 756 endif
 757
 758 localver-full = $(localver)$(localver-auto)
 759
 760 # Store (new) KERNELRELASE string in .kernelrelease
 761 kernelrelease = $(KERNELVERSION)$(localver-full)
 762 .kernelrelease: FORCE
 763         $(Q)rm -f $@
 764         $(Q)echo $(kernelrelease) > $@
 765
 766
 767 # Things we need to do before we recursively start building the kernel
 768 # or the modules are listed in "prepare".
 769 # A multi level approach is used. prepareN is processed before prepareN-1.
 770 # archprepare is used in arch Makefiles and when processed asm symlink,
 771 # version.h and scripts_basic is processed / created.
 772
 773 # Listed in dependency order
 774 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 775
 776 # prepare-all is deprecated, use prepare as valid replacement
 777 PHONY += prepare-all
 778
 779 # prepare3 is used to check if we are building in a separate output directory,
 780 # and if so do:
 781 # 1) Check that make has not been executed in the kernel src $(srctree)
 782 # 2) Create the include2 directory, used for the second asm symlink
 783 prepare3: .kernelrelease
 784 ifneq ($(KBUILD_SRC),)
 785         @echo '  Using $(srctree) as source for busybox'
 786         $(Q)if [ -f $(srctree)/.config ]; then \
 787                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 788                 echo "  in the '$(srctree)' directory.";\
 789                 /bin/false; \
 790         fi;
 791         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 792         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 793 endif
 794
 795 # prepare2 creates a makefile if using a separate output directory
 796 prepare2: prepare3 outputmakefile
 797
 798 prepare1: prepare2 include/config/MARKER
 799 ifneq ($(KBUILD_MODULES),)
 800         $(Q)mkdir -p $(MODVERDIR)
 801         $(Q)rm -f $(MODVERDIR)/*
 802 endif
 803
 804 archprepare: prepare1 scripts_basic
 805
 806 prepare0: archprepare FORCE
 807         $(Q)$(MAKE) $(build)=.
 808
 809 # All the preparing..
 810 prepare prepare-all: prepare0
 811
 812 #       Leave this as default for preprocessing busybox.lds.S, which is now
 813 #       done in arch/$(ARCH)/kernel/Makefile
 814
 815 export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
 816
 817 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 818 #       hard to detect, but I suppose "make mrproper" is a good idea
 819 #       before switching between archs anyway.
 820
 821 #bbox# include/asm:
 822 #bbox#  @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 823 #bbox#  $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 824 #bbox#  @ln -fsn asm-$(ARCH) $@
 825
 826 #       Split autoconf.h into include/linux/config/*
 827 quiet_cmd_gen_bbconfigopts = GEN     include/bbconfigopts.h
 828       cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs > include/bbconfigopts.h
 829 quiet_cmd_split_autoconf   = SPLIT   include/autoconf.h -> include/config/*
 830       cmd_split_autoconf   = scripts/basic/split-include include/autoconf.h include/config
 831 #bbox# piggybacked generation of few .h files
 832 include/config/MARKER: scripts/basic/split-include include/autoconf.h
 833         $(call cmd,split_autoconf)
 834         $(call cmd,gen_bbconfigopts)
 835         @touch $@
 836
 837 # Generate some files
 838 # ---------------------------------------------------------------------------
 839
 840 # KERNELRELEASE can change from a few different places, meaning version.h
 841 # needs to be updated, so this check is forced on all builds
 842
 843 uts_len := 64
 844
 845 define filechk_version.h
 846         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 847           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 848           exit 1; \
 849         fi; \
 850         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 851           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 852          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 853         )
 854 endef
 855
 856 # ---------------------------------------------------------------------------
 857
 858 PHONY += depend dep
 859 depend dep:
 860         @echo '*** Warning: make $@ is unnecessary now.'
 861
 862 # ---------------------------------------------------------------------------
 863 # Modules
 864
 865 ifdef _BB_DISABLED_CONFIG_MODULES
 866
 867 #       By default, build modules as well
 868
 869 all: modules
 870
 871 #       Build modules
 872
 873 PHONY += modules
 874 modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
 875         @echo '  Building modules, stage 2.';
 876         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 877
 878
 879 # Target to prepare building external modules
 880 PHONY += modules_prepare
 881 modules_prepare: prepare scripts
 882
 883 # Target to install modules
 884 PHONY += modules_install
 885 modules_install: _modinst_ _modinst_post
 886
 887 PHONY += _modinst_
 888 _modinst_:
 889         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 890                 echo "Warning: you may need to install module-init-tools"; \
 891                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 892                 sleep 1; \
 893         fi
 894         @rm -rf $(MODLIB)/kernel
 895         @rm -f $(MODLIB)/source
 896         @mkdir -p $(MODLIB)/kernel
 897         @ln -s $(srctree) $(MODLIB)/source
 898         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 899                 rm -f $(MODLIB)/build ; \
 900                 ln -s $(objtree) $(MODLIB)/build ; \
 901         fi
 902         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 903
 904 # If System.map exists, run depmod.  This deliberately does not have a
 905 # dependency on System.map since that would run the dependency tree on
 906 # busybox.  This depmod is only for convenience to give the initial
 907 # boot a modules.dep even before / is mounted read-write.  However the
 908 # boot script depmod is the master version.
 909 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 910 depmod_opts     :=
 911 else
 912 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 913 endif
 914 PHONY += _modinst_post
 915 _modinst_post: _modinst_
 916         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 917
 918 else # CONFIG_MODULES
 919
 920 # Modules not configured
 921 # ---------------------------------------------------------------------------
 922
 923 modules modules_install: FORCE
 924         @echo
 925         @echo "The present busybox configuration has modules disabled."
 926         @echo "Type 'make config' and enable loadable module support."
 927         @echo "Then build a kernel with module support enabled."
 928         @echo
 929         @exit 1
 930
 931 endif # CONFIG_MODULES
 932
 933 ###
 934 # Cleaning is done on three levels.
 935 # make clean     Delete most generated files
 936 #                Leave enough to build external modules
 937 # make mrproper  Delete the current configuration, and all generated files
 938 # make distclean Remove editor backup files, patch leftover files and the like
 939
 940 # Directories & files removed with 'make clean'
 941 CLEAN_DIRS  += $(MODVERDIR) _install 0_lib
 942 CLEAN_FILES +=  busybox busybox_unstripped* busybox.links \
 943                 System.map .kernelrelease \
 944                 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
 945
 946 # Directories & files removed with 'make mrproper'
 947 MRPROPER_DIRS  += include/config include2
 948 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
 949                   include/autoconf.h \
 950                   include/bbconfigopts.h \
 951                   include/usage_compressed.h \
 952                   include/applet_tables.h \
 953                   applets/usage \
 954                   .kernelrelease Module.symvers tags TAGS cscope* \
 955                   busybox_old
 956
 957 # clean - Delete most, but leave enough to build external modules
 958 #
 959 clean: rm-dirs  := $(CLEAN_DIRS)
 960 clean: rm-files := $(CLEAN_FILES)
 961 clean-dirs      := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
 962
 963 PHONY += $(clean-dirs) clean archclean
 964 $(clean-dirs):
 965         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 966
 967 clean: archclean $(clean-dirs)
 968         $(call cmd,rmdirs)
 969         $(call cmd,rmfiles)
 970         @find . $(RCS_FIND_IGNORE) \
 971                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 972                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 973                 -type f -print | xargs rm -f
 974
 975 PHONY += doc-clean
 976 doc-clean: rm-files := docs/busybox.pod \
 977                   docs/BusyBox.html docs/BusyBox.1 docs/BusyBox.txt
 978 doc-clean:
 979         $(call cmd,rmfiles)
 980
 981 # mrproper - Delete all generated files, including .config
 982 #
 983 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 984 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 985 mrproper-dirs      := $(addprefix _mrproper_,scripts)
 986
 987 PHONY += $(mrproper-dirs) mrproper archmrproper
 988 $(mrproper-dirs):
 989         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 990
 991 mrproper: clean archmrproper $(mrproper-dirs)
 992         $(call cmd,rmdirs)
 993         $(call cmd,rmfiles)
 994
 995 # distclean
 996 #
 997 PHONY += distclean
 998
 999 distclean: mrproper
1000         @find $(srctree) $(RCS_FIND_IGNORE) \
1001                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1002                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1003                 -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \
1004                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1005                 -type f -print | xargs rm -f
1006
1007
1008 # Packaging of the kernel to various formats
1009 # ---------------------------------------------------------------------------
1010 # rpm target kept for backward compatibility
1011 package-dir     := $(srctree)/scripts/package
1012
1013 %pkg: FORCE
1014         $(Q)$(MAKE) $(build)=$(package-dir) $@
1015 rpm: FORCE
1016         $(Q)$(MAKE) $(build)=$(package-dir) $@
1017
1018
1019 # Brief documentation of the typical targets used
1020 # ---------------------------------------------------------------------------
1021
1022 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1023 boards := $(notdir $(boards))
1024
1025 -include $(srctree)/Makefile.help
1026
1027 # Documentation targets
1028 # ---------------------------------------------------------------------------
1029 %docs: scripts_basic FORCE
1030         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1031
1032 else # KBUILD_EXTMOD
1033
1034 ###
1035 # External module support.
1036 # When building external modules the kernel used as basis is considered
1037 # read-only, and no consistency checks are made and the make
1038 # system is not used on the basis kernel. If updates are required
1039 # in the basis kernel ordinary make commands (without M=...) must
1040 # be used.
1041 #
1042 # The following are the only valid targets when building external
1043 # modules.
1044 # make M=dir clean     Delete all automatically generated files
1045 # make M=dir modules   Make all modules in specified dir
1046 # make M=dir           Same as 'make M=dir modules'
1047 # make M=dir modules_install
1048 #                      Install the modules build in the module directory
1049 #                      Assumes install directory is already created
1050
1051 # We are always building modules
1052 KBUILD_MODULES := 1
1053 PHONY += crmodverdir
1054 crmodverdir:
1055         $(Q)mkdir -p $(MODVERDIR)
1056         $(Q)rm -f $(MODVERDIR)/*
1057
1058 PHONY += $(objtree)/Module.symvers
1059 $(objtree)/Module.symvers:
1060         @test -e $(objtree)/Module.symvers || ( \
1061         echo; \
1062         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1063         echo "           is missing; modules will have no dependencies and modversions."; \
1064         echo )
1065
1066 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1067 PHONY += $(module-dirs) modules
1068 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1069         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1070
1071 modules: $(module-dirs)
1072         @echo '  Building modules, stage 2.';
1073         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1074
1075 PHONY += modules_install
1076 modules_install: _emodinst_ _emodinst_post
1077
1078 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1079 PHONY += _emodinst_
1080 _emodinst_:
1081         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1082         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1083
1084 # Run depmod only is we have System.map and depmod is executable
1085 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1086       cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1087                       $(DEPMOD) -ae -F System.map             \
1088                       $(if $(strip $(INSTALL_MOD_PATH)),      \
1089                       -b $(INSTALL_MOD_PATH) -r)              \
1090                       $(KERNELRELEASE);                       \
1091                    fi
1092
1093 PHONY += _emodinst_post
1094 _emodinst_post: _emodinst_
1095         $(call cmd,depmod)
1096
1097 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1098
1099 PHONY += $(clean-dirs) clean
1100 $(clean-dirs):
1101         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1102
1103 clean:  rm-dirs := $(MODVERDIR)
1104 clean: $(clean-dirs)
1105         $(call cmd,rmdirs)
1106         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1107                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1108                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1109                 -type f -print | xargs rm -f
1110
1111 help:
1112         @echo  '  Building external modules.'
1113         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1114         @echo  ''
1115         @echo  '  modules         - default target, build the module(s)'
1116         @echo  '  modules_install - install the module'
1117         @echo  '  clean           - remove generated files in module directory only'
1118         @echo  ''
1119
1120 # Dummies...
1121 PHONY += prepare scripts
1122 prepare: ;
1123 scripts: ;
1124 endif # KBUILD_EXTMOD
1125
1126 # Generate tags for editors
1127 # ---------------------------------------------------------------------------
1128
1129 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1130 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1131 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1132
1133 ifeq ($(src),$(obj))
1134 __srctree =
1135 else
1136 __srctree = $(srctree)/
1137 endif
1138
1139 ifeq ($(ALLSOURCE_ARCHS),)
1140 ifeq ($(ARCH),um)
1141 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1142 else
1143 ALLINCLUDE_ARCHS := $(ARCH)
1144 endif
1145 else
1146 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1147 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1148 endif
1149
1150 ALLSOURCE_ARCHS := $(ARCH)
1151
1152 define all-sources
1153         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1154                \( -name include -o -name arch \) -prune -o \
1155                -name '*.[chS]' -print; \
1156           for ARCH in $(ALLSOURCE_ARCHS) ; do \
1157                find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1158                     -name '*.[chS]' -print; \
1159           done ; \
1160           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1161                -name '*.[chS]' -print; \
1162           find $(__srctree)include $(RCS_FIND_IGNORE) \
1163                \( -name config -o -name 'asm-*' \) -prune \
1164                -o -name '*.[chS]' -print; \
1165           for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1166                find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1167                     -name '*.[chS]' -print; \
1168           done ; \
1169           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1170                -name '*.[chS]' -print )
1171 endef
1172
1173 quiet_cmd_cscope-file = FILELST cscope.files
1174       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1175
1176 quiet_cmd_cscope = MAKE    cscope.out
1177       cmd_cscope = cscope -b
1178
1179 cscope: FORCE
1180         $(call cmd,cscope-file)
1181         $(call cmd,cscope)
1182
1183 quiet_cmd_TAGS = MAKE   $@
1184 define cmd_TAGS
1185         rm -f $@; \
1186         ETAGSF=`etags --version | grep -i exuberant >/dev/null &&     \
1187                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1188                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1189                       --extra=+f --c-kinds=+px"`;                     \
1190                 $(all-sources) | xargs etags $$ETAGSF -a
1191 endef
1192
1193 TAGS: FORCE
1194         $(call cmd,TAGS)
1195
1196
1197 quiet_cmd_tags = MAKE   $@
1198 define cmd_tags
1199         rm -f $@; \
1200         CTAGSF=`ctags --version | grep -i exuberant >/dev/null &&     \
1201                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1202                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1203                       --extra=+f --c-kinds=+px"`;                     \
1204                 $(all-sources) | xargs ctags $$CTAGSF -a
1205 endef
1206
1207 tags: FORCE
1208         $(call cmd,tags)
1209
1210
1211 # Scripts to check various things for consistency
1212 # ---------------------------------------------------------------------------
1213
1214 includecheck:
1215         find * $(RCS_FIND_IGNORE) \
1216                 -name '*.[hcS]' -type f -print | sort \
1217                 | xargs $(PERL) -w scripts/checkincludes.pl
1218
1219 versioncheck:
1220         find * $(RCS_FIND_IGNORE) \
1221                 -name '*.[hcS]' -type f -print | sort \
1222                 | xargs $(PERL) -w scripts/checkversion.pl
1223
1224 namespacecheck:
1225         $(PERL) $(srctree)/scripts/namespace.pl
1226
1227 endif #ifeq ($(config-targets),1)
1228 endif #ifeq ($(mixed-targets),1)
1229
1230 PHONY += checkstack
1231 checkstack:
1232         $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
1233         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1234
1235 kernelrelease:
1236         $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1237         $(error kernelrelease not valid - run 'make *config' to update it))
1238 kernelversion:
1239         @echo $(KERNELVERSION)
1240
1241 # Single targets
1242 # ---------------------------------------------------------------------------
1243 # Single targets are compatible with:
1244 # - build whith mixed source and output
1245 # - build with separate output dir 'make O=...'
1246 # - external modules
1247 #
1248 #  target-dir => where to store outputfile
1249 #  build-dir  => directory in kernel source tree to use
1250
1251 ifeq ($(KBUILD_EXTMOD),)
1252         build-dir  = $(patsubst %/,%,$(dir $@))
1253         target-dir = $(dir $@)
1254 else
1255         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1256         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1257         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1258 endif
1259
1260 %.s: %.c prepare scripts FORCE
1261         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1262 %.i: %.c prepare scripts FORCE
1263         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1264 %.o: %.c prepare scripts FORCE
1265         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1266 %.lst: %.c prepare scripts FORCE
1267         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1268 %.s: %.S prepare scripts FORCE
1269         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1270 %.o: %.S prepare scripts FORCE
1271         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1272
1273 # Modules
1274 / %/: prepare scripts FORCE
1275         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1276         $(build)=$(build-dir)
1277 %.ko: prepare scripts FORCE
1278         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1279         $(build)=$(build-dir) $(@:.ko=.o)
1280         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1281
1282 # FIXME Should go into a make.lib or something
1283 # ===========================================================================
1284
1285 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1286       cmd_rmdirs = rm -rf $(rm-dirs)
1287
1288 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1289       cmd_rmfiles = rm -f $(rm-files)
1290
1291
1292 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1293           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1294           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1295
1296 quiet_cmd_as_o_S = AS      $@
1297 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1298
1299 # read all saved command lines
1300
1301 targets := $(wildcard $(sort $(targets)))
1302 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1303
1304 ifneq ($(cmd_files),)
1305   $(cmd_files): ;       # Do not try to update included dependency files
1306   include $(cmd_files)
1307 endif
1308
1309 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1310 # Usage:
1311 # $(Q)$(MAKE) $(clean)=dir
1312 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1313
1314 endif   # skip-makefile
1315
1316 PHONY += FORCE
1317 FORCE:
1318
1319 -include $(srctree)/Makefile.custom
1320
1321 # Declare the contents of the .PHONY variable as phony.  We keep that
1322 # information in a variable se we can use it in if_changed and friends.
1323 .PHONY: $(PHONY)