linux/Makefile
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   1VERSION = 2
   2PATCHLEVEL = 6
   3SUBLEVEL = 24
   4EXTRAVERSION = .3
   5NAME = Err Metey! A Heury Beelge-a Ret!
   6
   7# *DOCUMENTATION*
   8# To see a list of typical targets execute "make help"
   9# More info can be located in ./README
  10# Comments in this file are targeted only to the developer, do not
  11# expect to learn how to build the kernel reading this file.
  12
  13# Do not:
  14# o  use make's built-in rules and variables
  15#    (this increases performance and avoids hard-to-debug behaviour);
  16# o  print "Entering directory ...";
  17MAKEFLAGS += -rR --no-print-directory
  18
  19# We are using a recursive build, so we need to do a little thinking
  20# to get the ordering right.
  21#
  22# Most importantly: sub-Makefiles should only ever modify files in
  23# their own directory. If in some directory we have a dependency on
  24# a file in another dir (which doesn't happen often, but it's often
  25# unavoidable when linking the built-in.o targets which finally
  26# turn into vmlinux), we will call a sub make in that other dir, and
  27# after that we are sure that everything which is in that other dir
  28# is now up to date.
  29#
  30# The only cases where we need to modify files which have global
  31# effects are thus separated out and done before the recursive
  32# descending is started. They are now explicitly listed as the
  33# prepare rule.
  34
  35# To put more focus on warnings, be less verbose as default
  36# Use 'make V=1' to see the full commands
  37
  38ifdef V
  39  ifeq ("$(origin V)", "command line")
  40    KBUILD_VERBOSE = $(V)
  41  endif
  42endif
  43ifndef KBUILD_VERBOSE
  44  KBUILD_VERBOSE = 0
  45endif
  46
  47# Call a source code checker (by default, "sparse") as part of the
  48# C compilation.
  49#
  50# Use 'make C=1' to enable checking of only re-compiled files.
  51# Use 'make C=2' to enable checking of *all* source files, regardless
  52# of whether they are re-compiled or not.
  53#
  54# See the file "Documentation/sparse.txt" for more details, including
  55# where to get the "sparse" utility.
  56
  57ifdef C
  58  ifeq ("$(origin C)", "command line")
  59    KBUILD_CHECKSRC = $(C)
  60  endif
  61endif
  62ifndef KBUILD_CHECKSRC
  63  KBUILD_CHECKSRC = 0
  64endif
  65
  66# Use make M=dir to specify directory of external module to build
  67# Old syntax make ... SUBDIRS=$PWD is still supported
  68# Setting the environment variable KBUILD_EXTMOD take precedence
  69ifdef SUBDIRS
  70  KBUILD_EXTMOD ?= $(SUBDIRS)
  71endif
  72ifdef M
  73  ifeq ("$(origin M)", "command line")
  74    KBUILD_EXTMOD := $(M)
  75  endif
  76endif
  77
  78
  79# kbuild supports saving output files in a separate directory.
  80# To locate output files in a separate directory two syntaxes are supported.
  81# In both cases the working directory must be the root of the kernel src.
  82# 1) O=
  83# Use "make O=dir/to/store/output/files/"
  84#
  85# 2) Set KBUILD_OUTPUT
  86# Set the environment variable KBUILD_OUTPUT to point to the directory
  87# where the output files shall be placed.
  88# export KBUILD_OUTPUT=dir/to/store/output/files/
  89# make
  90#
  91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92# variable.
  93
  94
  95# KBUILD_SRC is set on invocation of make in OBJ directory
  96# KBUILD_SRC is not intended to be used by the regular user (for now)
  97ifeq ($(KBUILD_SRC),)
  98
  99# OK, Make called in directory where kernel src resides
 100# Do we want to locate output files in a separate directory?
 101ifdef O
 102  ifeq ("$(origin O)", "command line")
 103    KBUILD_OUTPUT := $(O)
 104  endif
 105endif
 106
 107# That's our default target when none is given on the command line
 108PHONY := _all
 109_all:
 110
 111# Cancel implicit rules on top Makefile
 112$(CURDIR)/Makefile Makefile: ;
 113
 114ifneq ($(KBUILD_OUTPUT),)
 115# Invoke a second make in the output directory, passing relevant variables
 116# check that the output directory actually exists
 117saved-output := $(KBUILD_OUTPUT)
 118KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 119$(if $(KBUILD_OUTPUT),, \
 120     $(error output directory "$(saved-output)" does not exist))
 121
 122PHONY += $(MAKECMDGOALS) sub-make
 123
 124$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 125        $(Q)@:
 126
 127sub-make: FORCE
 128        $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 129        KBUILD_SRC=$(CURDIR) \
 130        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 131        $(filter-out _all sub-make,$(MAKECMDGOALS))
 132
 133# Leave processing to above invocation of make
 134skip-makefile := 1
 135endif # ifneq ($(KBUILD_OUTPUT),)
 136endif # ifeq ($(KBUILD_SRC),)
 137
 138# We process the rest of the Makefile if this is the final invocation of make
 139ifeq ($(skip-makefile),)
 140
 141# If building an external module we do not care about the all: rule
 142# but instead _all depend on modules
 143PHONY += all
 144ifeq ($(KBUILD_EXTMOD),)
 145_all: all
 146else
 147_all: modules
 148endif
 149
 150srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 151TOPDIR          := $(srctree)
 152# FIXME - TOPDIR is obsolete, use srctree/objtree
 153objtree         := $(CURDIR)
 154src             := $(srctree)
 155obj             := $(objtree)
 156
 157VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159export srctree objtree VPATH TOPDIR
 160
 161
 162# SUBARCH tells the usermode build what the underlying arch is.  That is set
 163# first, and if a usermode build is happening, the "ARCH=um" on the command
 164# line overrides the setting of ARCH below.  If a native build is happening,
 165# then ARCH is assigned, getting whatever value it gets normally, and 
 166# SUBARCH is subsequently ignored.
 167
 168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                  -e s/sh[234].*/sh/ )
 173
 174# Cross compiling and selecting different set of gcc/bin-utils
 175# ---------------------------------------------------------------------------
 176#
 177# When performing cross compilation for other architectures ARCH shall be set
 178# to the target architecture. (See arch/* for the possibilities).
 179# ARCH can be set during invocation of make:
 180# make ARCH=ia64
 181# Another way is to have ARCH set in the environment.
 182# The default ARCH is the host where make is executed.
 183
 184# CROSS_COMPILE specify the prefix used for all executables used
 185# during compilation. Only gcc and related bin-utils executables
 186# are prefixed with $(CROSS_COMPILE).
 187# CROSS_COMPILE can be set on the command line
 188# make CROSS_COMPILE=ia64-linux-
 189# Alternatively CROSS_COMPILE can be set in the environment.
 190# Default value for CROSS_COMPILE is not to prefix executables
 191# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192
 193ARCH            ?= $(SUBARCH)
 194CROSS_COMPILE   ?=
 195
 196# Architecture as present in compile.h
 197UTS_MACHINE     := $(ARCH)
 198SRCARCH         := $(ARCH)
 199
 200# Additional ARCH settings for x86
 201ifeq ($(ARCH),i386)
 202        SRCARCH := x86
 203endif
 204ifeq ($(ARCH),x86_64)
 205        SRCARCH := x86
 206endif
 207
 208KCONFIG_CONFIG  ?= .config
 209
 210# SHELL used by kbuild
 211CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 212          else if [ -x /bin/bash ]; then echo /bin/bash; \
 213          else echo sh; fi ; fi)
 214
 215HOSTCC       = gcc
 216HOSTCXX      = g++
 217HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 218HOSTCXXFLAGS = -O2
 219
 220# Decide whether to build built-in, modular, or both.
 221# Normally, just do built-in.
 222
 223KBUILD_MODULES :=
 224KBUILD_BUILTIN := 1
 225
 226#       If we have only "make modules", don't compile built-in objects.
 227#       When we're building modules with modversions, we need to consider
 228#       the built-in objects during the descend as well, in order to
 229#       make sure the checksums are up to date before we record them.
 230
 231ifeq ($(MAKECMDGOALS),modules)
 232  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 233endif
 234
 235#       If we have "make <whatever> modules", compile modules
 236#       in addition to whatever we do anyway.
 237#       Just "make" or "make all" shall build modules as well
 238
 239ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 240  KBUILD_MODULES := 1
 241endif
 242
 243ifeq ($(MAKECMDGOALS),)
 244  KBUILD_MODULES := 1
 245endif
 246
 247export KBUILD_MODULES KBUILD_BUILTIN
 248export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 249
 250# Beautify output
 251# ---------------------------------------------------------------------------
 252#
 253# Normally, we echo the whole command before executing it. By making
 254# that echo $($(quiet)$(cmd)), we now have the possibility to set
 255# $(quiet) to choose other forms of output instead, e.g.
 256#
 257#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 258#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 259#
 260# If $(quiet) is empty, the whole command will be printed.
 261# If it is set to "quiet_", only the short version will be printed. 
 262# If it is set to "silent_", nothing will be printed at all, since
 263# the variable $(silent_cmd_cc_o_c) doesn't exist.
 264#
 265# A simple variant is to prefix commands with $(Q) - that's useful
 266# for commands that shall be hidden in non-verbose mode.
 267#
 268#       $(Q)ln $@ :<
 269#
 270# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 271# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 272
 273ifeq ($(KBUILD_VERBOSE),1)
 274  quiet =
 275  Q =
 276else
 277  quiet=quiet_
 278  Q = @
 279endif
 280
 281# If the user is running make -s (silent mode), suppress echoing of
 282# commands
 283
 284ifneq ($(findstring s,$(MAKEFLAGS)),)
 285  quiet=silent_
 286endif
 287
 288export quiet Q KBUILD_VERBOSE
 289
 290
 291# Look for make include files relative to root of kernel src
 292MAKEFLAGS += --include-dir=$(srctree)
 293
 294# We need some generic definitions (do not try to remake the file).
 295$(srctree)/scripts/Kbuild.include: ;
 296include $(srctree)/scripts/Kbuild.include
 297
 298# Make variables (CC, etc...)
 299
 300AS              = $(CROSS_COMPILE)as
 301LD              = $(CROSS_COMPILE)ld
 302CC              = $(CROSS_COMPILE)gcc
 303CPP             = $(CC) -E
 304AR              = $(CROSS_COMPILE)ar
 305NM              = $(CROSS_COMPILE)nm
 306STRIP           = $(CROSS_COMPILE)strip
 307OBJCOPY         = $(CROSS_COMPILE)objcopy
 308OBJDUMP         = $(CROSS_COMPILE)objdump
 309AWK             = awk
 310GENKSYMS        = scripts/genksyms/genksyms
 311DEPMOD          = /sbin/depmod
 312KALLSYMS        = scripts/kallsyms
 313PERL            = perl
 314CHECK           = sparse
 315
 316CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 317MODFLAGS        = -DMODULE
 318CFLAGS_MODULE   = $(MODFLAGS)
 319AFLAGS_MODULE   = $(MODFLAGS)
 320LDFLAGS_MODULE  =
 321CFLAGS_KERNEL   =
 322AFLAGS_KERNEL   =
 323
 324
 325# Use LINUXINCLUDE when you must reference the include/ directory.
 326# Needed to be compatible with the O= option
 327LINUXINCLUDE    := -Iinclude \
 328                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 329                   -include include/linux/autoconf.h
 330
 331KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
 332
 333KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 334                   -fno-strict-aliasing -fno-common \
 335                   -Werror-implicit-function-declaration
 336KBUILD_AFLAGS   := -D__ASSEMBLY__
 337
 338# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 339KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 340KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 341
 342export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 343export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 344export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 345export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 346
 347export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 348export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 349export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 350
 351# When compiling out-of-tree modules, put MODVERDIR in the module
 352# tree rather than in the kernel tree. The kernel tree might
 353# even be read-only.
 354export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 355
 356# Files to ignore in find ... statements
 357
 358RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 359export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 360
 361# ===========================================================================
 362# Rules shared between *config targets and build targets
 363
 364# Basic helpers built in scripts/
 365PHONY += scripts_basic
 366scripts_basic:
 367        $(Q)$(MAKE) $(build)=scripts/basic
 368
 369# To avoid any implicit rule to kick in, define an empty command.
 370scripts/basic/%: scripts_basic ;
 371
 372PHONY += outputmakefile
 373# outputmakefile generates a Makefile in the output directory, if using a
 374# separate output directory. This allows convenient use of make in the
 375# output directory.
 376outputmakefile:
 377ifneq ($(KBUILD_SRC),)
 378        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 379            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 380endif
 381
 382# To make sure we do not include .config for any of the *config targets
 383# catch them early, and hand them over to scripts/kconfig/Makefile
 384# It is allowed to specify more targets when calling make, including
 385# mixing *config targets and build targets.
 386# For example 'make oldconfig all'.
 387# Detect when mixed targets is specified, and make a second invocation
 388# of make so .config is not included in this case either (for *config).
 389
 390no-dot-config-targets := clean mrproper distclean \
 391                         cscope TAGS tags help %docs check% \
 392                         include/linux/version.h headers_% \
 393                         kernelrelease kernelversion
 394
 395config-targets := 0
 396mixed-targets  := 0
 397dot-config     := 1
 398
 399ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 400        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 401                dot-config := 0
 402        endif
 403endif
 404
 405ifeq ($(KBUILD_EXTMOD),)
 406        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 407                config-targets := 1
 408                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 409                        mixed-targets := 1
 410                endif
 411        endif
 412endif
 413
 414ifeq ($(mixed-targets),1)
 415# ===========================================================================
 416# We're called with mixed targets (*config and build targets).
 417# Handle them one by one.
 418
 419%:: FORCE
 420        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 421
 422else
 423ifeq ($(config-targets),1)
 424# ===========================================================================
 425# *config targets only - make sure prerequisites are updated, and descend
 426# in scripts/kconfig to make the *config target
 427
 428# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 429# KBUILD_DEFCONFIG may point out an alternative default configuration
 430# used for 'make defconfig'
 431include $(srctree)/arch/$(SRCARCH)/Makefile
 432export KBUILD_DEFCONFIG
 433
 434config %config: scripts_basic outputmakefile FORCE
 435        $(Q)mkdir -p include/linux include/config
 436        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 437
 438else
 439# ===========================================================================
 440# Build targets only - this includes vmlinux, arch specific targets, clean
 441# targets and others. In general all targets except *config targets.
 442
 443ifeq ($(KBUILD_EXTMOD),)
 444# Additional helpers built in scripts/
 445# Carefully list dependencies so we do not try to build scripts twice
 446# in parallel
 447PHONY += scripts
 448scripts: scripts_basic include/config/auto.conf
 449        $(Q)$(MAKE) $(build)=$(@)
 450
 451# Objects we will link into vmlinux / subdirs we need to visit
 452init-y          := init/
 453drivers-y       := drivers/ sound/
 454net-y           := net/
 455libs-y          := lib/
 456core-y          := usr/
 457endif # KBUILD_EXTMOD
 458
 459ifeq ($(dot-config),1)
 460# Read in config
 461-include include/config/auto.conf
 462
 463ifeq ($(KBUILD_EXTMOD),)
 464# Read in dependencies to all Kconfig* files, make sure to run
 465# oldconfig if changes are detected.
 466-include include/config/auto.conf.cmd
 467
 468# To avoid any implicit rule to kick in, define an empty command
 469$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 470
 471# If .config is newer than include/config/auto.conf, someone tinkered
 472# with it and forgot to run make oldconfig.
 473# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 474# we execute the config step to be sure to catch updated Kconfig files
 475include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 476        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 477else
 478# external modules needs include/linux/autoconf.h and include/config/auto.conf
 479# but do not care if they are up-to-date. Use auto.conf to trigger the test
 480PHONY += include/config/auto.conf
 481
 482include/config/auto.conf:
 483        $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 484        echo;                                                           \
 485        echo "  ERROR: Kernel configuration is invalid.";               \
 486        echo "         include/linux/autoconf.h or $@ are missing.";    \
 487        echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 488        echo;                                                           \
 489        /bin/false)
 490
 491endif # KBUILD_EXTMOD
 492
 493else
 494# Dummy target needed, because used as prerequisite
 495include/config/auto.conf: ;
 496endif # $(dot-config)
 497
 498# The all: target is the default when no target is given on the
 499# command line.
 500# This allow a user to issue only 'make' to build a kernel including modules
 501# Defaults vmlinux but it is usually overridden in the arch makefile
 502all: vmlinux
 503
 504ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 505KBUILD_CFLAGS   += -Os
 506else
 507KBUILD_CFLAGS   += -O2
 508endif
 509
 510include $(srctree)/arch/$(SRCARCH)/Makefile
 511
 512ifdef CONFIG_FRAME_POINTER
 513KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 514else
 515KBUILD_CFLAGS   += -fomit-frame-pointer
 516endif
 517
 518ifdef CONFIG_DEBUG_INFO
 519KBUILD_CFLAGS   += -g
 520KBUILD_AFLAGS   += -gdwarf-2
 521endif
 522
 523# Force gcc to behave correct even for buggy distributions
 524KBUILD_CFLAGS         += $(call cc-option, -fno-stack-protector)
 525
 526# arch Makefile may override CC so keep this after arch Makefile is included
 527NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 528CHECKFLAGS     += $(NOSTDINC_FLAGS)
 529
 530# warn about C99 declaration after statement
 531KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 532
 533# disable pointer signed / unsigned warnings in gcc 4.0
 534KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 535
 536# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 537# But warn user when we do so
 538warn-assign = \
 539$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 540
 541ifneq ($(KCPPFLAGS),)
 542        $(call warn-assign,CPPFLAGS)
 543        KBUILD_CPPFLAGS += $(KCPPFLAGS)
 544endif
 545ifneq ($(KAFLAGS),)
 546        $(call warn-assign,AFLAGS)
 547        KBUILD_AFLAGS += $(KAFLAGS)
 548endif
 549ifneq ($(KCFLAGS),)
 550        $(call warn-assign,CFLAGS)
 551        KBUILD_CFLAGS += $(KCFLAGS)
 552endif
 553
 554# Use --build-id when available.
 555LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 556                              $(call ld-option, -Wl$(comma)--build-id,))
 557LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 558LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 559
 560# Default kernel image to build when no specific target is given.
 561# KBUILD_IMAGE may be overruled on the command line or
 562# set in the environment
 563# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 564# this default value
 565export KBUILD_IMAGE ?= vmlinux
 566
 567#
 568# INSTALL_PATH specifies where to place the updated kernel and system map
 569# images. Default is /boot, but you can set it to other values
 570export  INSTALL_PATH ?= /boot
 571
 572#
 573# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 574# relocations required by build roots.  This is not defined in the
 575# makefile but the argument can be passed to make if needed.
 576#
 577
 578MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 579export MODLIB
 580
 581#
 582#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 583#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 584#  the default option --strip-debug will be used.  Otherwise,
 585#  INSTALL_MOD_STRIP will used as the options to the strip command.
 586
 587ifdef INSTALL_MOD_STRIP
 588ifeq ($(INSTALL_MOD_STRIP),1)
 589mod_strip_cmd = $(STRIP) --strip-debug
 590else
 591mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 592endif # INSTALL_MOD_STRIP=1
 593else
 594mod_strip_cmd = true
 595endif # INSTALL_MOD_STRIP
 596export mod_strip_cmd
 597
 598
 599ifeq ($(KBUILD_EXTMOD),)
 600core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 601
 602vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 603                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 604                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 605
 606vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 607                     $(init-n) $(init-) \
 608                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 609                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 610
 611init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 612core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 613drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 614net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 615libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 616libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 617libs-y          := $(libs-y1) $(libs-y2)
 618
 619# Build vmlinux
 620# ---------------------------------------------------------------------------
 621# vmlinux is built from the objects selected by $(vmlinux-init) and
 622# $(vmlinux-main). Most are built-in.o files from top-level directories
 623# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 624# Ordering when linking is important, and $(vmlinux-init) must be first.
 625#
 626# vmlinux
 627#   ^
 628#   |
 629#   +-< $(vmlinux-init)
 630#   |   +--< init/version.o + more
 631#   |
 632#   +--< $(vmlinux-main)
 633#   |    +--< driver/built-in.o mm/built-in.o + more
 634#   |
 635#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 636#
 637# vmlinux version (uname -v) cannot be updated during normal
 638# descending-into-subdirs phase since we do not yet know if we need to
 639# update vmlinux.
 640# Therefore this step is delayed until just before final link of vmlinux -
 641# except in the kallsyms case where it is done just before adding the
 642# symbols to the kernel.
 643#
 644# System.map is generated to document addresses of all kernel symbols
 645
 646vmlinux-init := $(head-y) $(init-y)
 647vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 648vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 649vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 650export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 651
 652# Rule to link vmlinux - also used during CONFIG_KALLSYMS
 653# May be overridden by arch/$(ARCH)/Makefile
 654quiet_cmd_vmlinux__ ?= LD      $@
 655      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 656      -T $(vmlinux-lds) $(vmlinux-init)                          \
 657      --start-group $(vmlinux-main) --end-group                  \
 658      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 659
 660# Generate new vmlinux version
 661quiet_cmd_vmlinux_version = GEN     .version
 662      cmd_vmlinux_version = set -e;                     \
 663        if [ ! -r .version ]; then                      \
 664          rm -f .version;                               \
 665          echo 1 >.version;                             \
 666        else                                            \
 667          mv .version .old_version;                     \
 668          expr 0$$(cat .old_version) + 1 >.version;     \
 669        fi;                                             \
 670        $(MAKE) $(build)=init
 671
 672# Generate System.map
 673quiet_cmd_sysmap = SYSMAP
 674      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 675
 676# Link of vmlinux
 677# If CONFIG_KALLSYMS is set .version is already updated
 678# Generate System.map and verify that the content is consistent
 679# Use + in front of the vmlinux_version rule to silent warning with make -j2
 680# First command is ':' to allow us to use + in front of the rule
 681define rule_vmlinux__
 682        :
 683        $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 684
 685        $(call cmd,vmlinux__)
 686        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 687
 688        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 689          echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 690        $(cmd_sysmap) $@ System.map;                                         \
 691        if [ $$? -ne 0 ]; then                                               \
 692                rm -f $@;                                                    \
 693                /bin/false;                                                  \
 694        fi;
 695        $(verify_kallsyms)
 696endef
 697
 698
 699ifdef CONFIG_KALLSYMS
 700# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 701# It's a three stage process:
 702# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 703#   empty
 704#   Running kallsyms on that gives us .tmp_kallsyms1.o with
 705#   the right size - vmlinux version (uname -v) is updated during this step
 706# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 707#   but due to the added section, some addresses have shifted.
 708#   From here, we generate a correct .tmp_kallsyms2.o
 709# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 710# o Verify that the System.map from vmlinux matches the map from
 711#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 712# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 713#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 714#   temporary bypass to allow the kernel to be built while the
 715#   maintainers work out what went wrong with kallsyms.
 716
 717ifdef CONFIG_KALLSYMS_EXTRA_PASS
 718last_kallsyms := 3
 719else
 720last_kallsyms := 2
 721endif
 722
 723kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 724
 725define verify_kallsyms
 726        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 727          echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 728          $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 729        $(Q)cmp -s System.map .tmp_System.map ||                             \
 730                (echo Inconsistent kallsyms data;                            \
 731                 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 732                 rm .tmp_kallsyms* ; /bin/false )
 733endef
 734
 735# Update vmlinux version before link
 736# Use + in front of this rule to silent warning about make -j1
 737# First command is ':' to allow us to use + in front of this rule
 738cmd_ksym_ld = $(cmd_vmlinux__)
 739define rule_ksym_ld
 740        : 
 741        +$(call cmd,vmlinux_version)
 742        $(call cmd,vmlinux__)
 743        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 744endef
 745
 746# Generate .S file with all kernel symbols
 747quiet_cmd_kallsyms = KSYM    $@
 748      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 749                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 750
 751.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 752        $(call if_changed_dep,as_o_S)
 753
 754.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 755        $(call cmd,kallsyms)
 756
 757# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 758.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 759        $(call if_changed_rule,ksym_ld)
 760
 761.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 762        $(call if_changed,vmlinux__)
 763
 764.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 765        $(call if_changed,vmlinux__)
 766
 767# Needs to visit scripts/ before $(KALLSYMS) can be used.
 768$(KALLSYMS): scripts ;
 769
 770# Generate some data for debugging strange kallsyms problems
 771debug_kallsyms: .tmp_map$(last_kallsyms)
 772
 773.tmp_map%: .tmp_vmlinux% FORCE
 774        ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 775
 776.tmp_map3: .tmp_map2
 777
 778.tmp_map2: .tmp_map1
 779
 780endif # ifdef CONFIG_KALLSYMS
 781
 782# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 783# relevant sections renamed as per the linker script.
 784quiet_cmd_vmlinux-modpost = LD      $@
 785      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 786         $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 787         $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
 788define rule_vmlinux-modpost
 789        :
 790        +$(call cmd,vmlinux-modpost)
 791        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 792        $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 793endef
 794
 795# vmlinux image - including updated kernel symbols
 796vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
 797ifdef CONFIG_HEADERS_CHECK
 798        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 799endif
 800ifdef CONFIG_SAMPLES
 801        $(Q)$(MAKE) $(build)=samples
 802endif
 803        $(call vmlinux-modpost)
 804        $(call if_changed_rule,vmlinux__)
 805        $(Q)rm -f .old_version
 806
 807vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 808        $(call if_changed_rule,vmlinux-modpost)
 809
 810# The actual objects are generated when descending, 
 811# make sure no implicit rule kicks in
 812$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 813
 814# Handle descending into subdirectories listed in $(vmlinux-dirs)
 815# Preset locale variables to speed up the build process. Limit locale
 816# tweaks to this spot to avoid wrong language settings when running
 817# make menuconfig etc.
 818# Error messages still appears in the original language
 819
 820PHONY += $(vmlinux-dirs)
 821$(vmlinux-dirs): prepare scripts
 822        $(Q)$(MAKE) $(build)=$@
 823
 824# Build the kernel release string
 825#
 826# The KERNELRELEASE value built here is stored in the file
 827# include/config/kernel.release, and is used when executing several
 828# make targets, such as "make install" or "make modules_install."
 829#
 830# The eventual kernel release string consists of the following fields,
 831# shown in a hierarchical format to show how smaller parts are concatenated
 832# to form the larger and final value, with values coming from places like
 833# the Makefile, kernel config options, make command line options and/or
 834# SCM tag information.
 835#
 836#       $(KERNELVERSION)
 837#         $(VERSION)                    eg, 2
 838#         $(PATCHLEVEL)                 eg, 6
 839#         $(SUBLEVEL)                   eg, 18
 840#         $(EXTRAVERSION)               eg, -rc6
 841#       $(localver-full)
 842#         $(localver)
 843#           localversion*               (files without backups, containing '~')
 844#           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 845#         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 846#           ./scripts/setlocalversion   (SCM tag, if one exists)
 847#           $(LOCALVERSION)             (from make command line if provided)
 848#
 849#  Note how the final $(localver-auto) string is included *only* if the
 850# kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 851# moment, only git is supported but other SCMs can edit the script
 852# scripts/setlocalversion and add the appropriate checks as needed.
 853
 854pattern = ".*/localversion[^~]*"
 855string  = $(shell cat /dev/null \
 856           `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 857
 858localver = $(subst $(space),, $(string) \
 859                              $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 860
 861# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 862# and if the SCM is know a tag from the SCM is appended.
 863# The appended tag is determined by the SCM used.
 864#
 865# Currently, only git is supported.
 866# Other SCMs can edit scripts/setlocalversion and add the appropriate
 867# checks as needed.
 868ifdef CONFIG_LOCALVERSION_AUTO
 869        _localver-auto = $(shell $(CONFIG_SHELL) \
 870                          $(srctree)/scripts/setlocalversion $(srctree))
 871        localver-auto  = $(LOCALVERSION)$(_localver-auto)
 872endif
 873
 874localver-full = $(localver)$(localver-auto)
 875
 876# Store (new) KERNELRELASE string in include/config/kernel.release
 877kernelrelease = $(KERNELVERSION)$(localver-full)
 878include/config/kernel.release: include/config/auto.conf FORCE
 879        $(Q)rm -f $@
 880        $(Q)echo $(kernelrelease) > $@
 881
 882
 883# Things we need to do before we recursively start building the kernel
 884# or the modules are listed in "prepare".
 885# A multi level approach is used. prepareN is processed before prepareN-1.
 886# archprepare is used in arch Makefiles and when processed asm symlink,
 887# version.h and scripts_basic is processed / created.
 888
 889# Listed in dependency order
 890PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 891
 892# prepare3 is used to check if we are building in a separate output directory,
 893# and if so do:
 894# 1) Check that make has not been executed in the kernel src $(srctree)
 895# 2) Create the include2 directory, used for the second asm symlink
 896prepare3: include/config/kernel.release
 897ifneq ($(KBUILD_SRC),)
 898        @echo '  Using $(srctree) as source for kernel'
 899        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 900                echo "  $(srctree) is not clean, please run 'make mrproper'";\
 901                echo "  in the '$(srctree)' directory.";\
 902                /bin/false; \
 903        fi;
 904        $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 905        $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
 906endif
 907
 908# prepare2 creates a makefile if using a separate output directory
 909prepare2: prepare3 outputmakefile
 910
 911prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 912                   include/asm include/config/auto.conf
 913        $(cmd_crmodverdir)
 914
 915archprepare: prepare1 scripts_basic
 916
 917prepare0: archprepare FORCE
 918        $(Q)$(MAKE) $(build)=.
 919        $(Q)$(MAKE) $(build)=. missing-syscalls
 920
 921# All the preparing..
 922prepare: prepare0
 923
 924# Leave this as default for preprocessing vmlinux.lds.S, which is now
 925# done in arch/$(ARCH)/kernel/Makefile
 926
 927export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 928
 929# The asm symlink changes when $(ARCH) changes.
 930# Detect this and ask user to run make mrproper
 931
 932include/asm: FORCE
 933        $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`;   \
 934        if [ -L include/asm ]; then                                     \
 935                if [ "$$asmlink" != "$(SRCARCH)" ]; then                \
 936                        echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 937                        echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 938                        exit 1;                                         \
 939                fi;                                                     \
 940        else                                                            \
 941                echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';          \
 942                if [ ! -d include ]; then                               \
 943                        mkdir -p include;                               \
 944                fi;                                                     \
 945                ln -fsn asm-$(SRCARCH) $@;                              \
 946        fi
 947
 948# Generate some files
 949# ---------------------------------------------------------------------------
 950
 951# KERNELRELEASE can change from a few different places, meaning version.h
 952# needs to be updated, so this check is forced on all builds
 953
 954uts_len := 64
 955define filechk_utsrelease.h
 956        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 957          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 958          exit 1;                                                         \
 959        fi;                                                               \
 960        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 961endef
 962
 963define filechk_version.h
 964        (echo \#define LINUX_VERSION_CODE $(shell                             \
 965        expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 966        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 967endef
 968
 969include/linux/version.h: $(srctree)/Makefile FORCE
 970        $(call filechk,version.h)
 971
 972include/linux/utsrelease.h: include/config/kernel.release FORCE
 973        $(call filechk,utsrelease.h)
 974
 975# ---------------------------------------------------------------------------
 976
 977PHONY += depend dep
 978depend dep:
 979        @echo '*** Warning: make $@ is unnecessary now.'
 980
 981# ---------------------------------------------------------------------------
 982# Kernel headers
 983INSTALL_HDR_PATH=$(objtree)/usr
 984export INSTALL_HDR_PATH
 985
 986HDRFILTER=generic i386 x86_64
 987HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
 988
 989PHONY += headers_install_all
 990headers_install_all: include/linux/version.h scripts_basic FORCE
 991        $(Q)$(MAKE) $(build)=scripts scripts/unifdef
 992        $(Q)for arch in $(HDRARCHES); do \
 993         $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
 994         done
 995
 996PHONY += headers_install
 997headers_install: include/linux/version.h scripts_basic FORCE
 998        @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
 999          echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
1000          exit 1 ; fi
1001        $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1002        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
1003
1004PHONY += headers_check_all
1005headers_check_all: headers_install_all
1006        $(Q)for arch in $(HDRARCHES); do \
1007         $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
1008         done
1009
1010PHONY += headers_check
1011headers_check: headers_install
1012        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
1013
1014# ---------------------------------------------------------------------------
1015# Modules
1016
1017ifdef CONFIG_MODULES
1018
1019# By default, build modules as well
1020
1021all: modules
1022
1023#       Build modules
1024
1025PHONY += modules
1026modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1027        @echo '  Building modules, stage 2.';
1028        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1029
1030
1031# Target to prepare building external modules
1032PHONY += modules_prepare
1033modules_prepare: prepare scripts
1034
1035# Target to install modules
1036PHONY += modules_install
1037modules_install: _modinst_ _modinst_post
1038
1039PHONY += _modinst_
1040_modinst_:
1041        @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1042                echo "Warning: you may need to install module-init-tools"; \
1043                echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1044                sleep 1; \
1045        fi
1046        @rm -rf $(MODLIB)/kernel
1047        @rm -f $(MODLIB)/source
1048        @mkdir -p $(MODLIB)/kernel
1049        @ln -s $(srctree) $(MODLIB)/source
1050        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1051                rm -f $(MODLIB)/build ; \
1052                ln -s $(objtree) $(MODLIB)/build ; \
1053        fi
1054        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1055
1056# This depmod is only for convenience to give the initial
1057# boot a modules.dep even before / is mounted read-write.  However the
1058# boot script depmod is the master version.
1059PHONY += _modinst_post
1060_modinst_post: _modinst_
1061        $(call cmd,depmod)
1062
1063else # CONFIG_MODULES
1064
1065# Modules not configured
1066# ---------------------------------------------------------------------------
1067
1068modules modules_install: FORCE
1069        @echo
1070        @echo "The present kernel configuration has modules disabled."
1071        @echo "Type 'make config' and enable loadable module support."
1072        @echo "Then build a kernel with module support enabled."
1073        @echo
1074        @exit 1
1075
1076endif # CONFIG_MODULES
1077
1078###
1079# Cleaning is done on three levels.
1080# make clean     Delete most generated files
1081#                Leave enough to build external modules
1082# make mrproper  Delete the current configuration, and all generated files
1083# make distclean Remove editor backup files, patch leftover files and the like
1084
1085# Directories & files removed with 'make clean'
1086CLEAN_DIRS  += $(MODVERDIR)
1087CLEAN_FILES +=  vmlinux System.map \
1088                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1089
1090# Directories & files removed with 'make mrproper'
1091MRPROPER_DIRS  += include/config include2 usr/include
1092MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1093                  include/linux/autoconf.h include/linux/version.h      \
1094                  include/linux/utsrelease.h                            \
1095                  Module.symvers tags TAGS cscope*
1096
1097# clean - Delete most, but leave enough to build external modules
1098#
1099clean: rm-dirs  := $(CLEAN_DIRS)
1100clean: rm-files := $(CLEAN_FILES)
1101clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1102
1103PHONY += $(clean-dirs) clean archclean
1104$(clean-dirs):
1105        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1106
1107clean: archclean $(clean-dirs)
1108        $(call cmd,rmdirs)
1109        $(call cmd,rmfiles)
1110        @find . $(RCS_FIND_IGNORE) \
1111                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1112                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1113                -o -name '*.symtypes' \) \
1114                -type f -print | xargs rm -f
1115
1116# mrproper - Delete all generated files, including .config
1117#
1118mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1119mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1120mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1121
1122PHONY += $(mrproper-dirs) mrproper archmrproper
1123$(mrproper-dirs):
1124        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1125
1126mrproper: clean archmrproper $(mrproper-dirs)
1127        $(call cmd,rmdirs)
1128        $(call cmd,rmfiles)
1129
1130# distclean
1131#
1132PHONY += distclean
1133
1134distclean: mrproper
1135        @find $(srctree) $(RCS_FIND_IGNORE) \
1136                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1137                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1138                -o -name '.*.rej' -o -size 0 \
1139                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1140                -type f -print | xargs rm -f
1141
1142
1143# Packaging of the kernel to various formats
1144# ---------------------------------------------------------------------------
1145# rpm target kept for backward compatibility
1146package-dir     := $(srctree)/scripts/package
1147
1148%pkg: include/config/kernel.release FORCE
1149        $(Q)$(MAKE) $(build)=$(package-dir) $@
1150rpm: include/config/kernel.release FORCE
1151        $(Q)$(MAKE) $(build)=$(package-dir) $@
1152
1153
1154# Brief documentation of the typical targets used
1155# ---------------------------------------------------------------------------
1156
1157boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1158boards := $(notdir $(boards))
1159
1160help:
1161        @echo  'Cleaning targets:'
1162        @echo  '  clean           - Remove most generated files but keep the config and'
1163        @echo  '                    enough build support to build external modules'
1164        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1165        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1166        @echo  ''
1167        @echo  'Configuration targets:'
1168        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1169        @echo  ''
1170        @echo  'Other generic targets:'
1171        @echo  '  all             - Build all targets marked with [*]'
1172        @echo  '* vmlinux         - Build the bare kernel'
1173        @echo  '* modules         - Build all modules'
1174        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1175        @echo  '  dir/            - Build all files in dir and below'
1176        @echo  '  dir/file.[ois]  - Build specified target only'
1177        @echo  '  dir/file.ko     - Build module including final link'
1178        @echo  '  rpm             - Build a kernel as an RPM package'
1179        @echo  '  tags/TAGS       - Generate tags file for editors'
1180        @echo  '  cscope          - Generate cscope index'
1181        @echo  '  kernelrelease   - Output the release version string'
1182        @echo  '  kernelversion   - Output the version stored in Makefile'
1183        @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1184         echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1185         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1186         fi
1187        @echo  ''
1188        @echo  'Static analysers'
1189        @echo  '  checkstack      - Generate a list of stack hogs'
1190        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1191        @echo  '  export_report   - List the usages of all exported symbols'
1192        @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1193         echo  '  headers_check   - Sanity check on exported headers'; \
1194         fi
1195        @echo  ''
1196        @echo  'Kernel packaging:'
1197        @$(MAKE) $(build)=$(package-dir) help
1198        @echo  ''
1199        @echo  'Documentation targets:'
1200        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1201        @echo  ''
1202        @echo  'Architecture specific targets ($(ARCH)):'
1203        @$(if $(archhelp),$(archhelp),\
1204                echo '  No architecture specific help defined for $(ARCH)')
1205        @echo  ''
1206        @$(if $(boards), \
1207                $(foreach b, $(boards), \
1208                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1209                echo '')
1210
1211        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1212        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1213        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1214        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1215        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1216        @echo  ''
1217        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1218        @echo  'For further info see the ./README file'
1219
1220
1221# Documentation targets
1222# ---------------------------------------------------------------------------
1223%docs: scripts_basic FORCE
1224        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1225
1226else # KBUILD_EXTMOD
1227
1228###
1229# External module support.
1230# When building external modules the kernel used as basis is considered
1231# read-only, and no consistency checks are made and the make
1232# system is not used on the basis kernel. If updates are required
1233# in the basis kernel ordinary make commands (without M=...) must
1234# be used.
1235#
1236# The following are the only valid targets when building external
1237# modules.
1238# make M=dir clean     Delete all automatically generated files
1239# make M=dir modules   Make all modules in specified dir
1240# make M=dir           Same as 'make M=dir modules'
1241# make M=dir modules_install
1242#                      Install the modules built in the module directory
1243#                      Assumes install directory is already created
1244
1245# We are always building modules
1246KBUILD_MODULES := 1
1247PHONY += crmodverdir
1248crmodverdir:
1249        $(cmd_crmodverdir)
1250
1251PHONY += $(objtree)/Module.symvers
1252$(objtree)/Module.symvers:
1253        @test -e $(objtree)/Module.symvers || ( \
1254        echo; \
1255        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1256        echo "           is missing; modules will have no dependencies and modversions."; \
1257        echo )
1258
1259module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1260PHONY += $(module-dirs) modules
1261$(module-dirs): crmodverdir $(objtree)/Module.symvers
1262        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1263
1264modules: $(module-dirs)
1265        @echo '  Building modules, stage 2.';
1266        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1267
1268PHONY += modules_install
1269modules_install: _emodinst_ _emodinst_post
1270
1271install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1272PHONY += _emodinst_
1273_emodinst_:
1274        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1275        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1276
1277PHONY += _emodinst_post
1278_emodinst_post: _emodinst_
1279        $(call cmd,depmod)
1280
1281clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1282
1283PHONY += $(clean-dirs) clean
1284$(clean-dirs):
1285        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1286
1287clean:  rm-dirs := $(MODVERDIR)
1288clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1289clean: $(clean-dirs)
1290        $(call cmd,rmdirs)
1291        $(call cmd,rmfiles)
1292        @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1293                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1294                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1295                -type f -print | xargs rm -f
1296
1297help:
1298        @echo  '  Building external modules.'
1299        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1300        @echo  ''
1301        @echo  '  modules         - default target, build the module(s)'
1302        @echo  '  modules_install - install the module'
1303        @echo  '  clean           - remove generated files in module directory only'
1304        @echo  ''
1305
1306# Dummies...
1307PHONY += prepare scripts
1308prepare: ;
1309scripts: ;
1310endif # KBUILD_EXTMOD
1311
1312# Generate tags for editors
1313# ---------------------------------------------------------------------------
1314
1315#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1316#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1317#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1318
1319ifeq ($(src),$(obj))
1320__srctree =
1321else
1322__srctree = $(srctree)/
1323endif
1324
1325ifeq ($(ALLSOURCE_ARCHS),)
1326ifeq ($(ARCH),um)
1327ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1328else
1329ALLINCLUDE_ARCHS := $(SRCARCH)
1330endif
1331else
1332#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1333ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1334endif
1335
1336ALLSOURCE_ARCHS := $(SRCARCH)
1337
1338define find-sources
1339        ( for arch in $(ALLSOURCE_ARCHS) ; do \
1340               find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1341                    -name $1 -print; \
1342          done ; \
1343          find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1344               -name $1 -print; \
1345          find $(__srctree)include $(RCS_FIND_IGNORE) \
1346               \( -name config -o -name 'asm-*' \) -prune \
1347               -o -name $1 -print; \
1348          for arch in $(ALLINCLUDE_ARCHS) ; do \
1349               find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1350                    -name $1 -print; \
1351          done ; \
1352          find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1353               -name $1 -print; \
1354          find $(__srctree) $(RCS_FIND_IGNORE) \
1355               \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1356               -name $1 -print; \
1357          )
1358endef
1359
1360define all-sources
1361        $(call find-sources,'*.[chS]')
1362endef
1363define all-kconfigs
1364        $(call find-sources,'Kconfig*')
1365endef
1366define all-defconfigs
1367        $(call find-sources,'defconfig')
1368endef
1369
1370define xtags
1371        if $1 --version 2>&1 | grep -iq exuberant; then \
1372            $(all-sources) | xargs $1 -a \
1373                -I __initdata,__exitdata,__acquires,__releases \
1374                -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1375                --extra=+f --c-kinds=+px \
1376                --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1377            $(all-kconfigs) | xargs $1 -a \
1378                --langdef=kconfig \
1379                --language-force=kconfig \
1380                --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1381            $(all-defconfigs) | xargs -r $1 -a \
1382                --langdef=dotconfig \
1383                --language-force=dotconfig \
1384                --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1385        elif $1 --version 2>&1 | grep -iq emacs; then \
1386            $(all-sources) | xargs $1 -a; \
1387            $(all-kconfigs) | xargs $1 -a \
1388                --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1389            $(all-defconfigs) | xargs -r $1 -a \
1390                --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1391        else \
1392            $(all-sources) | xargs $1 -a; \
1393        fi
1394endef
1395
1396quiet_cmd_cscope-file = FILELST cscope.files
1397      cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1398
1399quiet_cmd_cscope = MAKE    cscope.out
1400      cmd_cscope = cscope -b
1401
1402cscope: FORCE
1403        $(call cmd,cscope-file)
1404        $(call cmd,cscope)
1405
1406quiet_cmd_TAGS = MAKE   $@
1407define cmd_TAGS
1408        rm -f $@; \
1409        $(call xtags,etags)
1410endef
1411
1412TAGS: FORCE
1413        $(call cmd,TAGS)
1414
1415quiet_cmd_tags = MAKE   $@
1416define cmd_tags
1417        rm -f $@; \
1418        $(call xtags,ctags)
1419endef
1420
1421tags: FORCE
1422        $(call cmd,tags)
1423
1424
1425# Scripts to check various things for consistency
1426# ---------------------------------------------------------------------------
1427
1428includecheck:
1429        find * $(RCS_FIND_IGNORE) \
1430                -name '*.[hcS]' -type f -print | sort \
1431                | xargs $(PERL) -w scripts/checkincludes.pl
1432
1433versioncheck:
1434        find * $(RCS_FIND_IGNORE) \
1435                -name '*.[hcS]' -type f -print | sort \
1436                | xargs $(PERL) -w scripts/checkversion.pl
1437
1438namespacecheck:
1439        $(PERL) $(srctree)/scripts/namespace.pl
1440
1441export_report:
1442        $(PERL) $(srctree)/scripts/export_report.pl
1443
1444endif #ifeq ($(config-targets),1)
1445endif #ifeq ($(mixed-targets),1)
1446
1447PHONY += checkstack kernelrelease kernelversion
1448
1449# UML needs a little special treatment here.  It wants to use the host
1450# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1451# else wants $(ARCH), including people doing cross-builds, which means
1452# that $(SUBARCH) doesn't work here.
1453ifeq ($(ARCH), um)
1454CHECKSTACK_ARCH := $(SUBARCH)
1455else
1456CHECKSTACK_ARCH := $(ARCH)
1457endif
1458checkstack:
1459        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1460        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1461
1462kernelrelease:
1463        $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1464        $(error kernelrelease not valid - run 'make prepare' to update it))
1465kernelversion:
1466        @echo $(KERNELVERSION)
1467
1468# Single targets
1469# ---------------------------------------------------------------------------
1470# Single targets are compatible with:
1471# - build whith mixed source and output
1472# - build with separate output dir 'make O=...'
1473# - external modules
1474#
1475#  target-dir => where to store outputfile
1476#  build-dir  => directory in kernel source tree to use
1477
1478ifeq ($(KBUILD_EXTMOD),)
1479        build-dir  = $(patsubst %/,%,$(dir $@))
1480        target-dir = $(dir $@)
1481else
1482        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1483        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1484        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1485endif
1486
1487%.s: %.c prepare scripts FORCE
1488        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1489%.i: %.c prepare scripts FORCE
1490        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1491%.o: %.c prepare scripts FORCE
1492        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1493%.lst: %.c prepare scripts FORCE
1494        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495%.s: %.S prepare scripts FORCE
1496        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1497%.o: %.S prepare scripts FORCE
1498        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499%.symtypes: %.c prepare scripts FORCE
1500        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501
1502# Modules
1503/ %/: prepare scripts FORCE
1504        $(cmd_crmodverdir)
1505        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1506        $(build)=$(build-dir)
1507%.ko: prepare scripts FORCE
1508        $(cmd_crmodverdir)
1509        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1510        $(build)=$(build-dir) $(@:.ko=.o)
1511        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1512
1513# FIXME Should go into a make.lib or something 
1514# ===========================================================================
1515
1516quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1517      cmd_rmdirs = rm -rf $(rm-dirs)
1518
1519quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1520      cmd_rmfiles = rm -f $(rm-files)
1521
1522# Run depmod only is we have System.map and depmod is executable
1523# and we build for the host arch
1524quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1525      cmd_depmod = \
1526        if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1527                $(DEPMOD) -ae -F System.map                                     \
1528                $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1529                $(KERNELRELEASE);                                               \
1530        fi
1531
1532# Create temporary dir for module support files
1533# clean it up only when building all modules
1534cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1535                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1536
1537a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1538          $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1539          $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1540
1541quiet_cmd_as_o_S = AS      $@
1542cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1543
1544# read all saved command lines
1545
1546targets := $(wildcard $(sort $(targets)))
1547cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1548
1549ifneq ($(cmd_files),)
1550  $(cmd_files): ;       # Do not try to update included dependency files
1551  include $(cmd_files)
1552endif
1553
1554# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1555# Usage:
1556# $(Q)$(MAKE) $(clean)=dir
1557clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1558
1559endif   # skip-makefile
1560
1561PHONY += FORCE
1562FORCE:
1563
1564# Declare the contents of the .PHONY variable as phony.  We keep that
1565# information in a variable se we can use it in if_changed and friends.
1566.PHONY: $(PHONY)
1567
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