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