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 145# FIXME - TOPDIR is obsolete, use srctree/objtree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