busybox/Makefile
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   1VERSION = 1
   2PATCHLEVEL = 29
   3SUBLEVEL = 3
   4EXTRAVERSION =
   5NAME = 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 ..."
  14MAKEFLAGS += --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
  35ifdef V
  36  ifeq ("$(origin V)", "command line")
  37    KBUILD_VERBOSE = $(V)
  38  endif
  39endif
  40ifndef KBUILD_VERBOSE
  41  KBUILD_VERBOSE = 0
  42endif
  43
  44# Call sparse as part of compilation of C files
  45# Use 'make C=1' to enable sparse checking
  46
  47ifdef C
  48  ifeq ("$(origin C)", "command line")
  49    KBUILD_CHECKSRC = $(C)
  50  endif
  51endif
  52ifndef KBUILD_CHECKSRC
  53  KBUILD_CHECKSRC = 0
  54endif
  55
  56# Use make M=dir to specify directory of external module to build
  57# Old syntax make ... SUBDIRS=$PWD is still supported
  58# Setting the environment variable KBUILD_EXTMOD take precedence
  59ifdef SUBDIRS
  60  KBUILD_EXTMOD ?= $(SUBDIRS)
  61endif
  62ifdef M
  63  ifeq ("$(origin M)", "command line")
  64    KBUILD_EXTMOD := $(M)
  65  endif
  66endif
  67
  68
  69# kbuild supports saving output files in a separate directory.
  70# To locate output files in a separate directory two syntaxes are supported.
  71# In both cases the working directory must be the root of the kernel src.
  72# 1) O=
  73# Use "make O=dir/to/store/output/files/"
  74#
  75# 2) Set KBUILD_OUTPUT
  76# Set the environment variable KBUILD_OUTPUT to point to the directory
  77# where the output files shall be placed.
  78# export KBUILD_OUTPUT=dir/to/store/output/files/
  79# make
  80#
  81# The O= assignment takes precedence over the KBUILD_OUTPUT environment
  82# variable.
  83
  84
  85# KBUILD_SRC is set on invocation of make in OBJ directory
  86# KBUILD_SRC is not intended to be used by the regular user (for now)
  87ifeq ($(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?
  91ifdef O
  92  ifeq ("$(origin O)", "command line")
  93    KBUILD_OUTPUT := $(O)
  94  endif
  95endif
  96
  97# That's our default target when none is given on the command line
  98PHONY := _all
  99_all:
 100
 101ifneq ($(KBUILD_OUTPUT),)
 102# Invoke a second make in the output directory, passing relevant variables
 103# check that the output directory actually exists
 104saved-output := $(KBUILD_OUTPUT)
 105KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 106$(if $(KBUILD_OUTPUT),, \
 107     $(error output directory "$(saved-output)" does not exist))
 108
 109PHONY += $(MAKECMDGOALS)
 110
 111$(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 $@
 115
 116# Leave processing to above invocation of make
 117skip-makefile := 1
 118endif # ifneq ($(KBUILD_OUTPUT),)
 119endif # ifeq ($(KBUILD_SRC),)
 120
 121# We process the rest of the Makefile if this is the final invocation of make
 122ifeq ($(skip-makefile),)
 123
 124# If building an external module we do not care about the all: rule
 125# but instead _all depend on modules
 126PHONY += all
 127ifeq ($(KBUILD_EXTMOD),)
 128_all: all
 129else
 130_all: modules
 131endif
 132
 133srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 134TOPDIR          := $(srctree)
 135# FIXME - TOPDIR is obsolete, use srctree/objtree
 136objtree         := $(CURDIR)
 137src             := $(srctree)
 138obj             := $(objtree)
 139
 140VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 141
 142export 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 $(CROSS_COMPILE).
 158# CROSS_COMPILE can be set on the command line
 159# make CROSS_COMPILE=ia64-linux-
 160# Alternatively CROSS_COMPILE can be set in the environment.
 161# Default value for CROSS_COMPILE is not to prefix executables
 162# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 163
 164CROSS_COMPILE ?=
 165# bbox: we may have CONFIG_CROSS_COMPILER_PREFIX in .config,
 166# and it has not been included yet... thus using an awkward syntax.
 167ifeq ($(CROSS_COMPILE),)
 168CROSS_COMPILE := $(shell grep ^CONFIG_CROSS_COMPILER_PREFIX .config 2>/dev/null)
 169CROSS_COMPILE := $(subst CONFIG_CROSS_COMPILER_PREFIX=,,$(CROSS_COMPILE))
 170CROSS_COMPILE := $(subst ",,$(CROSS_COMPILE))
 171#")
 172endif
 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
 180ifneq ($(CROSS_COMPILE),)
 181SUBARCH := $(shell echo $(CROSS_COMPILE) | cut -d- -f1 | sed 's:^.*/::g')
 182else
 183SUBARCH := $(shell uname -m)
 184endif
 185SUBARCH := $(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
 190ARCH ?= $(SUBARCH)
 191
 192# Architecture as present in compile.h
 193UTS_MACHINE := $(ARCH)
 194
 195# SHELL used by kbuild
 196CONFIG_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
 203KBUILD_MODULES :=
 204KBUILD_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
 211ifeq ($(MAKECMDGOALS),modules)
 212  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 213endif
 214
 215#       If we have "make <whatever> modules", compile modules
 216#       in addition to whatever we do anyway.
 217#       Just "make" or "make all" shall build modules as well
 218
 219ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 220  KBUILD_MODULES := 1
 221endif
 222
 223ifeq ($(MAKECMDGOALS),)
 224  KBUILD_MODULES := 1
 225endif
 226
 227export KBUILD_MODULES KBUILD_BUILTIN
 228export 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 $@ :<
 249#
 250# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 251# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 252
 253ifeq ($(KBUILD_VERBOSE),1)
 254  quiet =
 255  Q =
 256else
 257  quiet=quiet_
 258  Q = @
 259endif
 260
 261# If the user is running make -s (silent mode), suppress echoing of
 262# commands
 263
 264ifneq ($(findstring s,$(MAKEFLAGS)),)
 265  quiet=silent_
 266endif
 267
 268export quiet Q KBUILD_VERBOSE
 269
 270
 271# Look for make include files relative to root of kernel src
 272MAKEFLAGS += --include-dir=$(srctree)
 273
 274HOSTCC          = gcc
 275HOSTCXX         = g++
 276HOSTCFLAGS      :=
 277HOSTCXXFLAGS    :=
 278# We need some generic definitions
 279include $(srctree)/scripts/Kbuild.include
 280
 281HOSTCFLAGS      += $(call hostcc-option,-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer,)
 282HOSTCXXFLAGS    += -O2
 283
 284# For maximum performance (+ possibly random breakage, uncomment
 285# the following)
 286
 287MAKEFLAGS += -rR
 288
 289# Make variables (CC, etc...)
 290
 291AS              = $(CROSS_COMPILE)as
 292CC              = $(CROSS_COMPILE)gcc
 293LD              = $(CC) -nostdlib
 294CPP             = $(CC) -E
 295AR              = $(CROSS_COMPILE)ar
 296NM              = $(CROSS_COMPILE)nm
 297STRIP           = $(CROSS_COMPILE)strip
 298OBJCOPY         = $(CROSS_COMPILE)objcopy
 299OBJDUMP         = $(CROSS_COMPILE)objdump
 300PKG_CONFIG      ?= $(CROSS_COMPILE)pkg-config
 301AWK             = awk
 302GENKSYMS        = scripts/genksyms/genksyms
 303DEPMOD          = /sbin/depmod
 304KALLSYMS        = scripts/kallsyms
 305PERL            = perl
 306CHECK           = sparse
 307
 308CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 309MODFLAGS        = -DMODULE
 310CFLAGS_MODULE   = $(MODFLAGS)
 311AFLAGS_MODULE   = $(MODFLAGS)
 312LDFLAGS_MODULE  = -r
 313CFLAGS_KERNEL   =
 314AFLAGS_KERNEL   =
 315
 316
 317# Use LINUXINCLUDE when you must reference the include/ directory.
 318# Needed to be compatible with the O= option
 319CFLAGS          := $(CFLAGS)
 320# Added only to final link stage of busybox binary
 321CFLAGS_busybox  := $(CFLAGS_busybox)
 322CPPFLAGS        := $(CPPFLAGS)
 323AFLAGS          := $(AFLAGS)
 324LDFLAGS         := $(LDFLAGS)
 325LDLIBS          :=
 326
 327# Read KERNELRELEASE from .kernelrelease (if it exists)
 328KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
 329KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 330
 331export  VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
 332        ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 333        CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 334        HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 335
 336export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 337export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 338export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 339export FLTFLAGS
 340
 341# When compiling out-of-tree modules, put MODVERDIR in the module
 342# tree rather than in the kernel tree. The kernel tree might
 343# even be read-only.
 344export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 345
 346# Files to ignore in find ... statements
 347
 348RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 349export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 350
 351# ===========================================================================
 352# Rules shared between *config targets and build targets
 353
 354# Basic helpers built in scripts/
 355PHONY += scripts_basic
 356scripts_basic:
 357        $(Q)$(MAKE) $(build)=scripts/basic
 358
 359# To avoid any implicit rule to kick in, define an empty command.
 360scripts/basic/%: scripts_basic ;
 361
 362# This target generates Kbuild's and Config.in's from *.c files
 363PHONY += gen_build_files
 364gen_build_files: $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c)
 365        $(Q)$(srctree)/scripts/gen_build_files.sh $(srctree) $(objtree)
 366
 367# bbox: we have helpers in applets/
 368# we depend on scripts_basic, since scripts/basic/fixdep
 369# must be built before any other host prog
 370PHONY += applets_dir
 371applets_dir: scripts_basic gen_build_files include/config/MARKER
 372        $(Q)$(MAKE) $(build)=applets
 373
 374applets/%: applets_dir ;
 375
 376PHONY += outputmakefile
 377# outputmakefile generates a Makefile in the output directory, if using a
 378# separate output directory. This allows convenient use of make in the
 379# output directory.
 380outputmakefile:
 381ifneq ($(KBUILD_SRC),)
 382        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 383            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 384endif
 385
 386# To make sure we do not include .config for any of the *config targets
 387# catch them early, and hand them over to scripts/kconfig/Makefile
 388# It is allowed to specify more targets when calling make, including
 389# mixing *config targets and build targets.
 390# For example 'make oldconfig all'.
 391# Detect when mixed targets is specified, and make a second invocation
 392# of make so .config is not included in this case either (for *config).
 393
 394no-dot-config-targets := clean mrproper distclean \
 395                         cscope TAGS tags help %docs
 396#bbox# check% is removed from above
 397
 398config-targets := 0
 399mixed-targets  := 0
 400dot-config     := 1
 401
 402ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 403        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 404                dot-config := 0
 405        endif
 406endif
 407
 408ifeq ($(KBUILD_EXTMOD),)
 409        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 410                config-targets := 1
 411                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 412                        mixed-targets := 1
 413                endif
 414        endif
 415endif
 416
 417ifeq ($(mixed-targets),1)
 418# ===========================================================================
 419# We're called with mixed targets (*config and build targets).
 420# Handle them one by one.
 421
 422%:: FORCE
 423        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 424
 425else
 426ifeq ($(config-targets),1)
 427# ===========================================================================
 428# *config targets only - make sure prerequisites are updated, and descend
 429# in scripts/kconfig to make the *config target
 430
 431# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 432# KBUILD_DEFCONFIG may point out an alternative default configuration
 433# used for 'make defconfig'
 434-include $(srctree)/arch/$(ARCH)/Makefile
 435export KBUILD_DEFCONFIG
 436
 437config: scripts_basic outputmakefile gen_build_files FORCE
 438        $(Q)mkdir -p include
 439        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 440        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
 441
 442%config: scripts_basic outputmakefile gen_build_files FORCE
 443        $(Q)mkdir -p include
 444        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 445        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
 446
 447else
 448# ===========================================================================
 449# Build targets only - this includes busybox, arch specific targets, clean
 450# targets and others. In general all targets except *config targets.
 451
 452ifeq ($(KBUILD_EXTMOD),)
 453# Additional helpers built in scripts/
 454# Carefully list dependencies so we do not try to build scripts twice
 455# in parallel
 456PHONY += scripts
 457scripts: gen_build_files scripts_basic include/config/MARKER
 458        $(Q)$(MAKE) $(build)=$(@)
 459
 460scripts_basic: include/autoconf.h
 461
 462# Objects we will link into busybox / subdirs we need to visit
 463core-y          := \
 464                applets/ \
 465
 466libs-y          := \
 467                archival/ \
 468                archival/libarchive/ \
 469                console-tools/ \
 470                coreutils/ \
 471                coreutils/libcoreutils/ \
 472                debianutils/ \
 473                klibc-utils/ \
 474                e2fsprogs/ \
 475                editors/ \
 476                findutils/ \
 477                init/ \
 478                libbb/ \
 479                libpwdgrp/ \
 480                loginutils/ \
 481                mailutils/ \
 482                miscutils/ \
 483                modutils/ \
 484                networking/ \
 485                networking/libiproute/ \
 486                networking/udhcp/ \
 487                printutils/ \
 488                procps/ \
 489                runit/ \
 490                selinux/ \
 491                shell/ \
 492                sysklogd/ \
 493                util-linux/ \
 494                util-linux/volume_id/ \
 495
 496endif # KBUILD_EXTMOD
 497
 498ifeq ($(dot-config),1)
 499# In this section, we need .config
 500
 501# Read in dependencies to all Kconfig* files, make sure to run
 502# oldconfig if changes are detected.
 503-include .kconfig.d
 504
 505-include .config
 506
 507# If .config needs to be updated, it will be done via the dependency
 508# that autoconf has on .config.
 509# To avoid any implicit rule to kick in, define an empty command
 510.config .kconfig.d: ;
 511
 512-include $(srctree)/arch/$(ARCH)/Makefile
 513
 514# Now we can define CFLAGS etc according to .config
 515include $(srctree)/Makefile.flags
 516
 517# If .config is newer than include/autoconf.h, someone tinkered
 518# with it and forgot to run make oldconfig.
 519# If kconfig.d is missing then we are probarly in a cleaned tree so
 520# we execute the config step to be sure to catch updated Kconfig files
 521include/autoconf.h: .kconfig.d .config $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c) | gen_build_files
 522        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 523
 524include/usage.h: gen_build_files
 525
 526else
 527# Dummy target needed, because used as prerequisite
 528include/autoconf.h: ;
 529endif
 530
 531# The all: target is the default when no target is given on the
 532# command line.
 533# This allow a user to issue only 'make' to build a kernel including modules
 534# Defaults busybox but it is usually overridden in the arch makefile
 535all: busybox doc
 536
 537# arch Makefile may override CC so keep this after arch Makefile is included
 538#bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 539CHECKFLAGS += $(NOSTDINC_FLAGS)
 540
 541# Default kernel image to build when no specific target is given.
 542# KBUILD_IMAGE may be overruled on the commandline or
 543# set in the environment
 544# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 545# this default value
 546export KBUILD_IMAGE ?= busybox
 547
 548#
 549# INSTALL_PATH specifies where to place the updated kernel and system map
 550# images. Default is /boot, but you can set it to other values
 551export  INSTALL_PATH ?= /boot
 552
 553#
 554# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 555# relocations required by build roots.  This is not defined in the
 556# makefile but the argument can be passed to make if needed.
 557#
 558
 559MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 560export MODLIB
 561
 562
 563ifeq ($(KBUILD_EXTMOD),)
 564busybox-dirs    := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
 565
 566busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
 567                     $(core-n) $(core-) $(libs-n) $(libs-) \
 568                )))
 569
 570core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 571libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 572libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 573libs-y          := $(libs-y1) $(libs-y2)
 574
 575# Build busybox
 576# ---------------------------------------------------------------------------
 577# busybox is build from the objects selected by $(busybox-init) and
 578# $(busybox-main). Most are built-in.o files from top-level directories
 579# in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 580# Ordering when linking is important, and $(busybox-init) must be first.
 581#
 582# busybox
 583#   ^
 584#   |
 585#   +-< $(busybox-init)
 586#   |   +--< init/version.o + more
 587#   |
 588#   +--< $(busybox-main)
 589#   |    +--< driver/built-in.o mm/built-in.o + more
 590#   |
 591#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 592#
 593# busybox version (uname -v) cannot be updated during normal
 594# descending-into-subdirs phase since we do not yet know if we need to
 595# update busybox.
 596# Therefore this step is delayed until just before final link of busybox -
 597# except in the kallsyms case where it is done just before adding the
 598# symbols to the kernel.
 599#
 600# System.map is generated to document addresses of all kernel symbols
 601
 602busybox-all  := $(core-y) $(libs-y)
 603
 604# Rule to link busybox - also used during CONFIG_KALLSYMS
 605# May be overridden by arch/$(ARCH)/Makefile
 606quiet_cmd_busybox__ ?= LINK    $@
 607      cmd_busybox__ ?= $(srctree)/scripts/trylink \
 608      "$@" \
 609      "$(CC)" \
 610      "$(CFLAGS) $(CFLAGS_busybox)" \
 611      "$(LDFLAGS) $(EXTRA_LDFLAGS)" \
 612      "$(core-y)" \
 613      "$(libs-y)" \
 614      "$(LDLIBS)" \
 615      && $(srctree)/scripts/generate_BUFSIZ.sh --post include/common_bufsiz.h
 616
 617# Generate System.map
 618quiet_cmd_sysmap = SYSMAP
 619      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 620
 621# Link of busybox
 622# If CONFIG_KALLSYMS is set .version is already updated
 623# Generate System.map and verify that the content is consistent
 624# Use + in front of the busybox_version rule to silent warning with make -j2
 625# First command is ':' to allow us to use + in front of the rule
 626define rule_busybox__
 627        :
 628        $(call cmd,busybox__)
 629        $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
 630endef
 631
 632
 633ifdef CONFIG_KALLSYMS
 634# Generate section listing all symbols and add it into busybox $(kallsyms.o)
 635# It's a three stage process:
 636# o .tmp_busybox1 has all symbols and sections, but __kallsyms is
 637#   empty
 638#   Running kallsyms on that gives us .tmp_kallsyms1.o with
 639#   the right size - busybox version (uname -v) is updated during this step
 640# o .tmp_busybox2 now has a __kallsyms section of the right size,
 641#   but due to the added section, some addresses have shifted.
 642#   From here, we generate a correct .tmp_kallsyms2.o
 643# o The correct .tmp_kallsyms2.o is linked into the final busybox.
 644# o Verify that the System.map from busybox matches the map from
 645#   .tmp_busybox2, just in case we did not generate kallsyms correctly.
 646# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 647#   .tmp_busybox3 and .tmp_kallsyms3.o.  This is only meant as a
 648#   temporary bypass to allow the kernel to be built while the
 649#   maintainers work out what went wrong with kallsyms.
 650
 651ifdef CONFIG_KALLSYMS_EXTRA_PASS
 652last_kallsyms := 3
 653else
 654last_kallsyms := 2
 655endif
 656
 657kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 658
 659define verify_kallsyms
 660        $(Q)$(if $($(quiet)cmd_sysmap),                       \
 661          echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 662          $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
 663        $(Q)cmp -s System.map .tmp_System.map ||              \
 664                (echo Inconsistent kallsyms data;             \
 665                 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 666                 rm .tmp_kallsyms* ; /bin/false )
 667endef
 668
 669# Update busybox version before link
 670# Use + in front of this rule to silent warning about make -j1
 671# First command is ':' to allow us to use + in front of this rule
 672cmd_ksym_ld = $(cmd_busybox__)
 673define rule_ksym_ld
 674        :
 675        +$(call cmd,busybox_version)
 676        $(call cmd,busybox__)
 677        $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
 678endef
 679
 680# Generate .S file with all kernel symbols
 681quiet_cmd_kallsyms = KSYM    $@
 682      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 683                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 684
 685.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 686        $(call if_changed_dep,as_o_S)
 687
 688.tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
 689        $(call cmd,kallsyms)
 690
 691# .tmp_busybox1 must be complete except kallsyms, so update busybox version
 692.tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
 693        $(call if_changed_rule,ksym_ld)
 694
 695.tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
 696        $(call if_changed,busybox__)
 697
 698.tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
 699        $(call if_changed,busybox__)
 700
 701# Needs to visit scripts/ before $(KALLSYMS) can be used.
 702$(KALLSYMS): scripts ;
 703
 704# Generate some data for debugging strange kallsyms problems
 705debug_kallsyms: .tmp_map$(last_kallsyms)
 706
 707.tmp_map%: .tmp_busybox% FORCE
 708        ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 709
 710.tmp_map3: .tmp_map2
 711
 712.tmp_map2: .tmp_map1
 713
 714endif # ifdef CONFIG_KALLSYMS
 715
 716# busybox image - including updated kernel symbols
 717busybox_unstripped: $(busybox-all) FORCE
 718        $(call if_changed_rule,busybox__)
 719        $(Q)rm -f .old_version
 720
 721busybox: busybox_unstripped
 722ifeq ($(SKIP_STRIP),y)
 723        $(Q)cp $< $@
 724else
 725        $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \
 726                busybox_unstripped -o $@
 727# strip is confused by PIE executable and does not set exec bits
 728        $(Q)chmod a+x $@
 729endif
 730
 731# The actual objects are generated when descending,
 732# make sure no implicit rule kicks in
 733$(sort $(busybox-all)): $(busybox-dirs) ;
 734
 735# Handle descending into subdirectories listed in $(busybox-dirs)
 736# Preset locale variables to speed up the build process. Limit locale
 737# tweaks to this spot to avoid wrong language settings when running
 738# make menuconfig etc.
 739# Error messages still appears in the original language
 740
 741PHONY += $(busybox-dirs)
 742$(busybox-dirs): prepare scripts
 743        $(Q)$(MAKE) $(build)=$@
 744
 745# Build the kernel release string
 746# The KERNELRELEASE is stored in a file named .kernelrelease
 747# to be used when executing for example make install or make modules_install
 748#
 749# Take the contents of any files called localversion* and the config
 750# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
 751# LOCALVERSION from the command line override all of this
 752
 753nullstring :=
 754space      := $(nullstring) # end of line
 755
 756___localver = $(objtree)/localversion* $(srctree)/localversion*
 757__localver  = $(sort $(wildcard $(___localver)))
 758# skip backup files (containing '~')
 759_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
 760
 761localver = $(subst $(space),, \
 762           $(shell cat /dev/null $(_localver)) \
 763           $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 764
 765# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 766# and if the SCM is know a tag from the SCM is appended.
 767# The appended tag is determinded by the SCM used.
 768#
 769# Currently, only git is supported.
 770# Other SCMs can edit scripts/setlocalversion and add the appropriate
 771# checks as needed.
 772ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO
 773        _localver-auto = $(shell $(CONFIG_SHELL) \
 774                          $(srctree)/scripts/setlocalversion $(srctree))
 775        localver-auto  = $(LOCALVERSION)$(_localver-auto)
 776endif
 777
 778localver-full = $(localver)$(localver-auto)
 779
 780# Store (new) KERNELRELASE string in .kernelrelease
 781kernelrelease = $(KERNELVERSION)$(localver-full)
 782.kernelrelease: FORCE
 783        $(Q)rm -f $@
 784        $(Q)echo $(kernelrelease) > $@
 785
 786
 787# Things we need to do before we recursively start building the kernel
 788# or the modules are listed in "prepare".
 789# A multi level approach is used. prepareN is processed before prepareN-1.
 790# archprepare is used in arch Makefiles and when processed asm symlink,
 791# version.h and scripts_basic is processed / created.
 792
 793# Listed in dependency order
 794PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 795
 796# prepare-all is deprecated, use prepare as valid replacement
 797PHONY += prepare-all
 798
 799# prepare3 is used to check if we are building in a separate output directory,
 800# and if so do:
 801# 1) Check that make has not been executed in the kernel src $(srctree)
 802# 2) Create the include2 directory, used for the second asm symlink
 803prepare3: .kernelrelease
 804ifneq ($(KBUILD_SRC),)
 805        @echo '  Using $(srctree) as source for busybox'
 806        $(Q)if [ -f $(srctree)/.config ]; then \
 807                echo "  $(srctree) is not clean, please run 'make mrproper'";\
 808                echo "  in the '$(srctree)' directory.";\
 809                /bin/false; \
 810        fi;
 811        $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 812        $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 813endif
 814
 815# prepare2 creates a makefile if using a separate output directory
 816prepare2: prepare3 outputmakefile
 817
 818prepare1: prepare2 include/config/MARKER
 819ifneq ($(KBUILD_MODULES),)
 820        $(Q)mkdir -p $(MODVERDIR)
 821        $(Q)rm -f $(MODVERDIR)/*
 822endif
 823
 824archprepare: prepare1 scripts_basic applets_dir
 825
 826prepare0: archprepare FORCE
 827        $(Q)$(MAKE) $(build)=.
 828
 829# All the preparing..
 830prepare prepare-all: prepare0
 831
 832#       Leave this as default for preprocessing busybox.lds.S, which is now
 833#       done in arch/$(ARCH)/kernel/Makefile
 834
 835export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
 836
 837#       FIXME: The asm symlink changes when $(ARCH) changes. That's
 838#       hard to detect, but I suppose "make mrproper" is a good idea
 839#       before switching between archs anyway.
 840
 841#bbox# include/asm:
 842#bbox#  @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 843#bbox#  $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 844#bbox#  @ln -fsn asm-$(ARCH) $@
 845
 846#       Split autoconf.h into include/linux/config/*
 847quiet_cmd_gen_bbconfigopts = GEN     include/bbconfigopts.h
 848      cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs include/bbconfigopts.h include/bbconfigopts_bz2.h
 849quiet_cmd_gen_common_bufsiz = GEN     include/common_bufsiz.h
 850      cmd_gen_common_bufsiz = $(srctree)/scripts/generate_BUFSIZ.sh include/common_bufsiz.h
 851quiet_cmd_split_autoconf   = SPLIT   include/autoconf.h -> include/config/*
 852      cmd_split_autoconf   = scripts/basic/split-include include/autoconf.h include/config
 853#bbox# piggybacked generation of few .h files
 854include/config/MARKER: scripts/basic/split-include include/autoconf.h
 855        $(call cmd,split_autoconf)
 856        $(call cmd,gen_bbconfigopts)
 857        $(call cmd,gen_common_bufsiz)
 858        @touch $@
 859
 860# Generate some files
 861# ---------------------------------------------------------------------------
 862
 863# KERNELRELEASE can change from a few different places, meaning version.h
 864# needs to be updated, so this check is forced on all builds
 865
 866uts_len := 64
 867
 868define filechk_version.h
 869        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 870          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 871          exit 1; \
 872        fi; \
 873        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 874          echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 875         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 876        )
 877endef
 878
 879# ---------------------------------------------------------------------------
 880
 881PHONY += depend dep
 882depend dep:
 883        @echo '*** Warning: make $@ is unnecessary now.'
 884
 885# ---------------------------------------------------------------------------
 886# Modules
 887
 888ifdef _BB_DISABLED_CONFIG_MODULES
 889
 890#       By default, build modules as well
 891
 892all: modules
 893
 894#       Build modules
 895
 896PHONY += modules
 897modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
 898        @echo '  Building modules, stage 2.';
 899        $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 900
 901
 902# Target to prepare building external modules
 903PHONY += modules_prepare
 904modules_prepare: prepare scripts
 905
 906# Target to install modules
 907PHONY += modules_install
 908modules_install: _modinst_ _modinst_post
 909
 910PHONY += _modinst_
 911_modinst_:
 912        @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 913                echo "Warning: you may need to install module-init-tools"; \
 914                echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 915                sleep 1; \
 916        fi
 917        @rm -rf $(MODLIB)/kernel
 918        @rm -f $(MODLIB)/source
 919        @mkdir -p $(MODLIB)/kernel
 920        @ln -s $(srctree) $(MODLIB)/source
 921        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 922                rm -f $(MODLIB)/build ; \
 923                ln -s $(objtree) $(MODLIB)/build ; \
 924        fi
 925        $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 926
 927# If System.map exists, run depmod.  This deliberately does not have a
 928# dependency on System.map since that would run the dependency tree on
 929# busybox.  This depmod is only for convenience to give the initial
 930# boot a modules.dep even before / is mounted read-write.  However the
 931# boot script depmod is the master version.
 932ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 933depmod_opts     :=
 934else
 935depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 936endif
 937PHONY += _modinst_post
 938_modinst_post: _modinst_
 939        if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 940
 941else # CONFIG_MODULES
 942
 943# Modules not configured
 944# ---------------------------------------------------------------------------
 945
 946modules modules_install: FORCE
 947        @echo
 948        @echo "The present busybox configuration has modules disabled."
 949        @echo "Type 'make config' and enable loadable module support."
 950        @echo "Then build a kernel with module support enabled."
 951        @echo
 952        @exit 1
 953
 954endif # CONFIG_MODULES
 955
 956###
 957# Cleaning is done on three levels.
 958# make clean     Delete most generated files
 959#                Leave enough to build external modules
 960# make mrproper  Delete the current configuration, and all generated files
 961# make distclean Remove editor backup files, patch leftover files and the like
 962
 963# Directories & files removed with 'make clean'
 964CLEAN_DIRS  += $(MODVERDIR) _install 0_lib
 965CLEAN_FILES +=  busybox busybox_unstripped* busybox.links \
 966                System.map .kernelrelease \
 967                .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
 968
 969# Directories & files removed with 'make mrproper'
 970MRPROPER_DIRS  += include/config include2
 971MRPROPER_FILES += .config .config.old include/asm .version .old_version \
 972                  include/NUM_APPLETS.h \
 973                  include/common_bufsiz.h \
 974                  include/autoconf.h \
 975                  include/bbconfigopts.h \
 976                  include/bbconfigopts_bz2.h \
 977                  include/usage_compressed.h \
 978                  include/applet_tables.h \
 979                  include/applets.h \
 980                  include/usage.h \
 981                  applets/usage \
 982                  .kernelrelease Module.symvers tags TAGS cscope* \
 983                  busybox_old
 984
 985# clean - Delete most, but leave enough to build external modules
 986#
 987clean: rm-dirs  := $(CLEAN_DIRS)
 988clean: rm-files := $(CLEAN_FILES)
 989clean-dirs      := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
 990
 991PHONY += $(clean-dirs) clean archclean
 992$(clean-dirs):
 993        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 994
 995clean: archclean $(clean-dirs)
 996        $(call cmd,rmdirs)
 997        $(call cmd,rmfiles)
 998        @find . $(RCS_FIND_IGNORE) \
 999                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1000                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1001                -type f -print | xargs rm -f
1002
1003PHONY += doc-clean
1004doc-clean: rm-files := docs/busybox.pod \
1005                  docs/BusyBox.html docs/busybox.1 docs/BusyBox.txt
1006doc-clean:
1007        $(call cmd,rmfiles)
1008
1009# mrproper - Delete all generated files, including .config
1010#
1011mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1012mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1013mrproper-dirs      := $(addprefix _mrproper_,scripts)
1014
1015PHONY += $(mrproper-dirs) mrproper archmrproper
1016$(mrproper-dirs):
1017        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1018
1019mrproper: clean archmrproper $(mrproper-dirs)
1020        $(call cmd,rmdirs)
1021        $(call cmd,rmfiles)
1022        @find . -name Config.src | sed 's/.src$$/.in/' | xargs -r rm -f
1023        @find . -name Kbuild.src | sed 's/.src$$//' | xargs -r rm -f
1024
1025# distclean
1026#
1027PHONY += distclean
1028
1029distclean: mrproper
1030        @find $(srctree) $(RCS_FIND_IGNORE) \
1031                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1032                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1033                -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \
1034                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1035                -type f -print | xargs rm -f
1036
1037
1038# Packaging of the kernel to various formats
1039# ---------------------------------------------------------------------------
1040# rpm target kept for backward compatibility
1041package-dir     := $(srctree)/scripts/package
1042
1043%pkg: FORCE
1044        $(Q)$(MAKE) $(build)=$(package-dir) $@
1045rpm: FORCE
1046        $(Q)$(MAKE) $(build)=$(package-dir) $@
1047
1048
1049# Brief documentation of the typical targets used
1050# ---------------------------------------------------------------------------
1051
1052boards := $(wildcard $(srctree)/configs/*_defconfig)
1053boards := $(notdir $(boards))
1054
1055-include $(srctree)/Makefile.help
1056
1057# Documentation targets
1058# ---------------------------------------------------------------------------
1059%docs: scripts_basic FORCE
1060        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1061
1062else # KBUILD_EXTMOD
1063
1064###
1065# External module support.
1066# When building external modules the kernel used as basis is considered
1067# read-only, and no consistency checks are made and the make
1068# system is not used on the basis kernel. If updates are required
1069# in the basis kernel ordinary make commands (without M=...) must
1070# be used.
1071#
1072# The following are the only valid targets when building external
1073# modules.
1074# make M=dir clean     Delete all automatically generated files
1075# make M=dir modules   Make all modules in specified dir
1076# make M=dir           Same as 'make M=dir modules'
1077# make M=dir modules_install
1078#                      Install the modules build in the module directory
1079#                      Assumes install directory is already created
1080
1081# We are always building modules
1082KBUILD_MODULES := 1
1083PHONY += crmodverdir
1084crmodverdir:
1085        $(Q)mkdir -p $(MODVERDIR)
1086        $(Q)rm -f $(MODVERDIR)/*
1087
1088PHONY += $(objtree)/Module.symvers
1089$(objtree)/Module.symvers:
1090        @test -e $(objtree)/Module.symvers || ( \
1091        echo; \
1092        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1093        echo "           is missing; modules will have no dependencies and modversions."; \
1094        echo )
1095
1096module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1097PHONY += $(module-dirs) modules
1098$(module-dirs): crmodverdir $(objtree)/Module.symvers
1099        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1100
1101modules: $(module-dirs)
1102        @echo '  Building modules, stage 2.';
1103        $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1104
1105PHONY += modules_install
1106modules_install: _emodinst_ _emodinst_post
1107
1108install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1109PHONY += _emodinst_
1110_emodinst_:
1111        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1112        $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1113
1114# Run depmod only is we have System.map and depmod is executable
1115quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1116      cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1117                      $(DEPMOD) -ae -F System.map             \
1118                      $(if $(strip $(INSTALL_MOD_PATH)),      \
1119                      -b $(INSTALL_MOD_PATH) -r)              \
1120                      $(KERNELRELEASE);                       \
1121                   fi
1122
1123PHONY += _emodinst_post
1124_emodinst_post: _emodinst_
1125        $(call cmd,depmod)
1126
1127clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1128
1129PHONY += $(clean-dirs) clean
1130$(clean-dirs):
1131        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1132
1133clean:  rm-dirs := $(MODVERDIR)
1134clean: $(clean-dirs)
1135        $(call cmd,rmdirs)
1136        @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1137                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1138                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1139                -type f -print | xargs rm -f
1140
1141# Dummies...
1142PHONY += prepare scripts
1143prepare: ;
1144scripts: ;
1145endif # KBUILD_EXTMOD
1146
1147# Generate tags for editors
1148# ---------------------------------------------------------------------------
1149
1150#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1151#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1152#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1153
1154ifeq ($(src),$(obj))
1155__srctree =
1156else
1157__srctree = $(srctree)/
1158endif
1159
1160ifeq ($(ALLSOURCE_ARCHS),)
1161ifeq ($(ARCH),um)
1162ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1163else
1164ALLINCLUDE_ARCHS := $(ARCH)
1165endif
1166else
1167#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1168ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1169endif
1170
1171ALLSOURCE_ARCHS := $(ARCH)
1172
1173define all-sources
1174        ( find -regex '.*\.[ch]$$' )
1175endef
1176
1177quiet_cmd_cscope-file = FILELST cscope.files
1178      cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1179
1180quiet_cmd_cscope = MAKE    cscope.out
1181      cmd_cscope = cscope -b
1182
1183cscope: FORCE
1184        $(call cmd,cscope-file)
1185        $(call cmd,cscope)
1186
1187quiet_cmd_TAGS = MAKE   $@
1188define cmd_TAGS
1189        rm -f $@; \
1190        ETAGSF=`etags --version | grep -i exuberant >/dev/null &&     \
1191                echo "-I __initdata,__exitdata,__acquires,__releases  \
1192                      -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1193                      --extra=+f --c-kinds=+px"`;                     \
1194                $(all-sources) | xargs etags $$ETAGSF -a
1195endef
1196
1197TAGS: FORCE
1198        $(call cmd,TAGS)
1199
1200
1201quiet_cmd_tags = MAKE   $@
1202define cmd_tags
1203        rm -f $@; \
1204        CTAGSF=`ctags --version | grep -i exuberant >/dev/null &&     \
1205                echo "-I __initdata,__exitdata,__acquires,__releases  \
1206                      -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1207                      --extra=+f --c-kinds=+px"`;                     \
1208                $(all-sources) | xargs ctags $$CTAGSF -a
1209endef
1210
1211tags: FORCE
1212        $(call cmd,tags)
1213
1214
1215# Scripts to check various things for consistency
1216# ---------------------------------------------------------------------------
1217
1218includecheck:
1219        find * $(RCS_FIND_IGNORE) \
1220                -name '*.[hcS]' -type f -print | sort \
1221                | xargs $(PERL) -w scripts/checkincludes.pl
1222
1223versioncheck:
1224        find * $(RCS_FIND_IGNORE) \
1225                -name '*.[hcS]' -type f -print | sort \
1226                | xargs $(PERL) -w scripts/checkversion.pl
1227
1228namespacecheck:
1229        $(PERL) $(srctree)/scripts/namespace.pl
1230
1231endif #ifeq ($(config-targets),1)
1232endif #ifeq ($(mixed-targets),1)
1233
1234PHONY += checkstack
1235checkstack:
1236        $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
1237        $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1238
1239kernelrelease:
1240        $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1241        $(error kernelrelease not valid - run 'make *config' to update it))
1242kernelversion:
1243        @echo $(KERNELVERSION)
1244
1245# Single targets
1246# ---------------------------------------------------------------------------
1247# Single targets are compatible with:
1248# - build whith mixed source and output
1249# - build with separate output dir 'make O=...'
1250# - external modules
1251#
1252#  target-dir => where to store outputfile
1253#  build-dir  => directory in kernel source tree to use
1254
1255ifeq ($(KBUILD_EXTMOD),)
1256        build-dir  = $(patsubst %/,%,$(dir $@))
1257        target-dir = $(dir $@)
1258else
1259        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1260        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1261        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1262endif
1263
1264%.s: %.c prepare scripts FORCE
1265        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1266%.i: %.c prepare scripts FORCE
1267        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1268%.o: %.c prepare scripts FORCE
1269        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1270%.lst: %.c prepare scripts FORCE
1271        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1272%.s: %.S prepare scripts FORCE
1273        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1274%.o: %.S prepare scripts FORCE
1275        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1276
1277# Modules
1278%/: prepare scripts FORCE
1279        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1280        $(build)=$(build-dir)
1281/: prepare scripts FORCE
1282        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1283        $(build)=$(build-dir)
1284
1285%.ko: prepare scripts FORCE
1286        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1287        $(build)=$(build-dir) $(@:.ko=.o)
1288        $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1289
1290# FIXME Should go into a make.lib or something
1291# ===========================================================================
1292
1293quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1294      cmd_rmdirs = rm -rf $(rm-dirs)
1295
1296quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1297      cmd_rmfiles = rm -f $(rm-files)
1298
1299
1300a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1301          $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1302          $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1303
1304quiet_cmd_as_o_S = AS      $@
1305cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1306
1307# read all saved command lines
1308
1309targets := $(wildcard $(sort $(targets)))
1310cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1311
1312ifneq ($(cmd_files),)
1313  $(cmd_files): ;       # Do not try to update included dependency files
1314  include $(cmd_files)
1315endif
1316
1317# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1318# Usage:
1319# $(Q)$(MAKE) $(clean)=dir
1320clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1321
1322endif   # skip-makefile
1323
1324PHONY += FORCE
1325FORCE:
1326
1327-include $(srctree)/Makefile.custom
1328
1329# Declare the contents of the .PHONY variable as phony.  We keep that
1330# information in a variable se we can use it in if_changed and friends.
1331.PHONY: $(PHONY)
1332