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   1VERSION = 3
   2PATCHLEVEL = 6
   3SUBLEVEL = 2
   4EXTRAVERSION =
   5NAME = Terrified Chipmunk
   6
   7# *DOCUMENTATION*
   8# To see a list of typical targets execute "make help"
   9# More info can be located in ./README
  10# Comments in this file are targeted only to the developer, do not
  11# expect to learn how to build the kernel reading this file.
  12
  13# Do not:
  14# o  use make's built-in rules and variables
  15#    (this increases performance and avoids hard-to-debug behaviour);
  16# o  print "Entering directory ...";
  17MAKEFLAGS += -rR --no-print-directory
  18
  19# Avoid funny character set dependencies
  20unexport LC_ALL
  21LC_COLLATE=C
  22LC_NUMERIC=C
  23export LC_COLLATE LC_NUMERIC
  24
  25# We are using a recursive build, so we need to do a little thinking
  26# to get the ordering right.
  27#
  28# Most importantly: sub-Makefiles should only ever modify files in
  29# their own directory. If in some directory we have a dependency on
  30# a file in another dir (which doesn't happen often, but it's often
  31# unavoidable when linking the built-in.o targets which finally
  32# turn into vmlinux), we will call a sub make in that other dir, and
  33# after that we are sure that everything which is in that other dir
  34# is now up to date.
  35#
  36# The only cases where we need to modify files which have global
  37# effects are thus separated out and done before the recursive
  38# descending is started. They are now explicitly listed as the
  39# prepare rule.
  40
  41# To put more focus on warnings, be less verbose as default
  42# Use 'make V=1' to see the full commands
  43
  44ifeq ("$(origin V)", "command line")
  45  KBUILD_VERBOSE = $(V)
  46endif
  47ifndef KBUILD_VERBOSE
  48  KBUILD_VERBOSE = 0
  49endif
  50
  51# Call a source code checker (by default, "sparse") as part of the
  52# C compilation.
  53#
  54# Use 'make C=1' to enable checking of only re-compiled files.
  55# Use 'make C=2' to enable checking of *all* source files, regardless
  56# of whether they are re-compiled or not.
  57#
  58# See the file "Documentation/sparse.txt" for more details, including
  59# where to get the "sparse" utility.
  60
  61ifeq ("$(origin C)", "command line")
  62  KBUILD_CHECKSRC = $(C)
  63endif
  64ifndef KBUILD_CHECKSRC
  65  KBUILD_CHECKSRC = 0
  66endif
  67
  68# Use make M=dir to specify directory of external module to build
  69# Old syntax make ... SUBDIRS=$PWD is still supported
  70# Setting the environment variable KBUILD_EXTMOD take precedence
  71ifdef SUBDIRS
  72  KBUILD_EXTMOD ?= $(SUBDIRS)
  73endif
  74
  75ifeq ("$(origin M)", "command line")
  76  KBUILD_EXTMOD := $(M)
  77endif
  78
  79# kbuild supports saving output files in a separate directory.
  80# To locate output files in a separate directory two syntaxes are supported.
  81# In both cases the working directory must be the root of the kernel src.
  82# 1) O=
  83# Use "make O=dir/to/store/output/files/"
  84#
  85# 2) Set KBUILD_OUTPUT
  86# Set the environment variable KBUILD_OUTPUT to point to the directory
  87# where the output files shall be placed.
  88# export KBUILD_OUTPUT=dir/to/store/output/files/
  89# make
  90#
  91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92# variable.
  93
  94
  95# KBUILD_SRC is set on invocation of make in OBJ directory
  96# KBUILD_SRC is not intended to be used by the regular user (for now)
  97ifeq ($(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?
 101ifeq ("$(origin O)", "command line")
 102  KBUILD_OUTPUT := $(O)
 103endif
 104
 105ifeq ("$(origin W)", "command line")
 106  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 107endif
 108
 109# That's our default target when none is given on the command line
 110PHONY := _all
 111_all:
 112
 113# Cancel implicit rules on top Makefile
 114$(CURDIR)/Makefile Makefile: ;
 115
 116ifneq ($(KBUILD_OUTPUT),)
 117# Invoke a second make in the output directory, passing relevant variables
 118# check that the output directory actually exists
 119saved-output := $(KBUILD_OUTPUT)
 120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 121$(if $(KBUILD_OUTPUT),, \
 122     $(error output directory "$(saved-output)" does not exist))
 123
 124PHONY += $(MAKECMDGOALS) sub-make
 125
 126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 127        $(Q)@:
 128
 129sub-make: FORCE
 130        $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 131        KBUILD_SRC=$(CURDIR) \
 132        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 133        $(filter-out _all sub-make,$(MAKECMDGOALS))
 134
 135# Leave processing to above invocation of make
 136skip-makefile := 1
 137endif # ifneq ($(KBUILD_OUTPUT),)
 138endif # ifeq ($(KBUILD_SRC),)
 139
 140# We process the rest of the Makefile if this is the final invocation of make
 141ifeq ($(skip-makefile),)
 142
 143# If building an external module we do not care about the all: rule
 144# but instead _all depend on modules
 145PHONY += all
 146ifeq ($(KBUILD_EXTMOD),)
 147_all: all
 148else
 149_all: modules
 150endif
 151
 152srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 153objtree         := $(CURDIR)
 154src             := $(srctree)
 155obj             := $(objtree)
 156
 157VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159export srctree objtree VPATH
 160
 161
 162# SUBARCH tells the usermode build what the underlying arch is.  That is set
 163# first, and if a usermode build is happening, the "ARCH=um" on the command
 164# line overrides the setting of ARCH below.  If a native build is happening,
 165# then ARCH is assigned, getting whatever value it gets normally, and 
 166# SUBARCH is subsequently ignored.
 167
 168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                  -e s/sh[234].*/sh/ )
 173
 174# Cross compiling and selecting different set of gcc/bin-utils
 175# ---------------------------------------------------------------------------
 176#
 177# When performing cross compilation for other architectures ARCH shall be set
 178# to the target architecture. (See arch/* for the possibilities).
 179# ARCH can be set during invocation of make:
 180# make ARCH=ia64
 181# Another way is to have ARCH set in the environment.
 182# The default ARCH is the host where make is executed.
 183
 184# CROSS_COMPILE specify the prefix used for all executables used
 185# during compilation. Only gcc and related bin-utils executables
 186# are prefixed with $(CROSS_COMPILE).
 187# CROSS_COMPILE can be set on the command line
 188# make CROSS_COMPILE=ia64-linux-
 189# Alternatively CROSS_COMPILE can be set in the environment.
 190# A third alternative is to store a setting in .config so that plain
 191# "make" in the configured kernel build directory always uses that.
 192# Default value for CROSS_COMPILE is not to prefix executables
 193# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 194export KBUILD_BUILDHOST := $(SUBARCH)
 195ARCH            ?= $(SUBARCH)
 196CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 197
 198# Architecture as present in compile.h
 199UTS_MACHINE     := $(ARCH)
 200SRCARCH         := $(ARCH)
 201
 202# Additional ARCH settings for x86
 203ifeq ($(ARCH),i386)
 204        SRCARCH := x86
 205endif
 206ifeq ($(ARCH),x86_64)
 207        SRCARCH := x86
 208endif
 209
 210# Additional ARCH settings for sparc
 211ifeq ($(ARCH),sparc32)
 212       SRCARCH := sparc
 213endif
 214ifeq ($(ARCH),sparc64)
 215       SRCARCH := sparc
 216endif
 217
 218# Additional ARCH settings for sh
 219ifeq ($(ARCH),sh64)
 220       SRCARCH := sh
 221endif
 222
 223# Additional ARCH settings for tile
 224ifeq ($(ARCH),tilepro)
 225       SRCARCH := tile
 226endif
 227ifeq ($(ARCH),tilegx)
 228       SRCARCH := tile
 229endif
 230
 231# Where to locate arch specific headers
 232hdr-arch  := $(SRCARCH)
 233
 234KCONFIG_CONFIG  ?= .config
 235export KCONFIG_CONFIG
 236
 237# SHELL used by kbuild
 238CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 239          else if [ -x /bin/bash ]; then echo /bin/bash; \
 240          else echo sh; fi ; fi)
 241
 242HOSTCC       = gcc
 243HOSTCXX      = g++
 244HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 245HOSTCXXFLAGS = -O2
 246
 247# Decide whether to build built-in, modular, or both.
 248# Normally, just do built-in.
 249
 250KBUILD_MODULES :=
 251KBUILD_BUILTIN := 1
 252
 253#       If we have only "make modules", don't compile built-in objects.
 254#       When we're building modules with modversions, we need to consider
 255#       the built-in objects during the descend as well, in order to
 256#       make sure the checksums are up to date before we record them.
 257
 258ifeq ($(MAKECMDGOALS),modules)
 259  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 260endif
 261
 262#       If we have "make <whatever> modules", compile modules
 263#       in addition to whatever we do anyway.
 264#       Just "make" or "make all" shall build modules as well
 265
 266ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 267  KBUILD_MODULES := 1
 268endif
 269
 270ifeq ($(MAKECMDGOALS),)
 271  KBUILD_MODULES := 1
 272endif
 273
 274export KBUILD_MODULES KBUILD_BUILTIN
 275export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 276
 277# Beautify output
 278# ---------------------------------------------------------------------------
 279#
 280# Normally, we echo the whole command before executing it. By making
 281# that echo $($(quiet)$(cmd)), we now have the possibility to set
 282# $(quiet) to choose other forms of output instead, e.g.
 283#
 284#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 285#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 286#
 287# If $(quiet) is empty, the whole command will be printed.
 288# If it is set to "quiet_", only the short version will be printed. 
 289# If it is set to "silent_", nothing will be printed at all, since
 290# the variable $(silent_cmd_cc_o_c) doesn't exist.
 291#
 292# A simple variant is to prefix commands with $(Q) - that's useful
 293# for commands that shall be hidden in non-verbose mode.
 294#
 295#       $(Q)ln $@ :<
 296#
 297# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 298# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 299
 300ifeq ($(KBUILD_VERBOSE),1)
 301  quiet =
 302  Q =
 303else
 304  quiet=quiet_
 305  Q = @
 306endif
 307
 308# If the user is running make -s (silent mode), suppress echoing of
 309# commands
 310
 311ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 312  quiet=silent_
 313endif
 314
 315export quiet Q KBUILD_VERBOSE
 316
 317
 318# Look for make include files relative to root of kernel src
 319MAKEFLAGS += --include-dir=$(srctree)
 320
 321# We need some generic definitions (do not try to remake the file).
 322$(srctree)/scripts/Kbuild.include: ;
 323include $(srctree)/scripts/Kbuild.include
 324
 325# Make variables (CC, etc...)
 326
 327AS              = $(CROSS_COMPILE)as
 328LD              = $(CROSS_COMPILE)ld
 329CC              = $(CROSS_COMPILE)gcc
 330CPP             = $(CC) -E
 331AR              = $(CROSS_COMPILE)ar
 332NM              = $(CROSS_COMPILE)nm
 333STRIP           = $(CROSS_COMPILE)strip
 334OBJCOPY         = $(CROSS_COMPILE)objcopy
 335OBJDUMP         = $(CROSS_COMPILE)objdump
 336AWK             = awk
 337GENKSYMS        = scripts/genksyms/genksyms
 338INSTALLKERNEL  := installkernel
 339DEPMOD          = /sbin/depmod
 340PERL            = perl
 341CHECK           = sparse
 342
 343CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 344                  -Wbitwise -Wno-return-void $(CF)
 345CFLAGS_MODULE   =
 346AFLAGS_MODULE   =
 347LDFLAGS_MODULE  =
 348CFLAGS_KERNEL   =
 349AFLAGS_KERNEL   =
 350CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 351
 352
 353# Use LINUXINCLUDE when you must reference the include/ directory.
 354# Needed to be compatible with the O= option
 355LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include \
 356                   -Iarch/$(hdr-arch)/include/generated -Iinclude \
 357                   $(if $(KBUILD_SRC), -I$(srctree)/include) \
 358                   -include $(srctree)/include/linux/kconfig.h
 359
 360KBUILD_CPPFLAGS := -D__KERNEL__
 361
 362KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 363                   -fno-strict-aliasing -fno-common \
 364                   -Werror-implicit-function-declaration \
 365                   -Wno-format-security \
 366                   -fno-delete-null-pointer-checks
 367KBUILD_AFLAGS_KERNEL :=
 368KBUILD_CFLAGS_KERNEL :=
 369KBUILD_AFLAGS   := -D__ASSEMBLY__
 370KBUILD_AFLAGS_MODULE  := -DMODULE
 371KBUILD_CFLAGS_MODULE  := -DMODULE
 372KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 373
 374# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 375KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 376KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 377
 378export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 379export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 380export CPP AR NM STRIP OBJCOPY OBJDUMP
 381export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 382export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 383
 384export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 385export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 386export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 387export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 388export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 389export KBUILD_ARFLAGS
 390
 391# When compiling out-of-tree modules, put MODVERDIR in the module
 392# tree rather than in the kernel tree. The kernel tree might
 393# even be read-only.
 394export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 395
 396# Files to ignore in find ... statements
 397
 398RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
 399                   -o -name .pc -o -name .hg -o -name .git \) -prune -o
 400export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 401                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
 402
 403# ===========================================================================
 404# Rules shared between *config targets and build targets
 405
 406# Basic helpers built in scripts/
 407PHONY += scripts_basic
 408scripts_basic:
 409        $(Q)$(MAKE) $(build)=scripts/basic
 410        $(Q)rm -f .tmp_quiet_recordmcount
 411
 412# To avoid any implicit rule to kick in, define an empty command.
 413scripts/basic/%: scripts_basic ;
 414
 415PHONY += outputmakefile
 416# outputmakefile generates a Makefile in the output directory, if using a
 417# separate output directory. This allows convenient use of make in the
 418# output directory.
 419outputmakefile:
 420ifneq ($(KBUILD_SRC),)
 421        $(Q)ln -fsn $(srctree) source
 422        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 423            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 424endif
 425
 426# Support for using generic headers in asm-generic
 427PHONY += asm-generic
 428asm-generic:
 429        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 430                    obj=arch/$(SRCARCH)/include/generated/asm
 431
 432# To make sure we do not include .config for any of the *config targets
 433# catch them early, and hand them over to scripts/kconfig/Makefile
 434# It is allowed to specify more targets when calling make, including
 435# mixing *config targets and build targets.
 436# For example 'make oldconfig all'.
 437# Detect when mixed targets is specified, and make a second invocation
 438# of make so .config is not included in this case either (for *config).
 439
 440no-dot-config-targets := clean mrproper distclean \
 441                         cscope gtags TAGS tags help %docs check% coccicheck \
 442                         include/linux/version.h headers_% archheaders archscripts \
 443                         kernelversion %src-pkg
 444
 445config-targets := 0
 446mixed-targets  := 0
 447dot-config     := 1
 448
 449ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 450        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 451                dot-config := 0
 452        endif
 453endif
 454
 455ifeq ($(KBUILD_EXTMOD),)
 456        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 457                config-targets := 1
 458                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 459                        mixed-targets := 1
 460                endif
 461        endif
 462endif
 463
 464ifeq ($(mixed-targets),1)
 465# ===========================================================================
 466# We're called with mixed targets (*config and build targets).
 467# Handle them one by one.
 468
 469%:: FORCE
 470        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 471
 472else
 473ifeq ($(config-targets),1)
 474# ===========================================================================
 475# *config targets only - make sure prerequisites are updated, and descend
 476# in scripts/kconfig to make the *config target
 477
 478# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 479# KBUILD_DEFCONFIG may point out an alternative default configuration
 480# used for 'make defconfig'
 481include $(srctree)/arch/$(SRCARCH)/Makefile
 482export KBUILD_DEFCONFIG KBUILD_KCONFIG
 483
 484config: scripts_basic outputmakefile FORCE
 485        $(Q)mkdir -p include/linux include/config
 486        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 487
 488%config: scripts_basic outputmakefile FORCE
 489        $(Q)mkdir -p include/linux include/config
 490        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 491
 492else
 493# ===========================================================================
 494# Build targets only - this includes vmlinux, arch specific targets, clean
 495# targets and others. In general all targets except *config targets.
 496
 497ifeq ($(KBUILD_EXTMOD),)
 498# Additional helpers built in scripts/
 499# Carefully list dependencies so we do not try to build scripts twice
 500# in parallel
 501PHONY += scripts
 502scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 503        $(Q)$(MAKE) $(build)=$(@)
 504
 505# Objects we will link into vmlinux / subdirs we need to visit
 506init-y          := init/
 507drivers-y       := drivers/ sound/ firmware/
 508net-y           := net/
 509libs-y          := lib/
 510core-y          := usr/
 511endif # KBUILD_EXTMOD
 512
 513ifeq ($(dot-config),1)
 514# Read in config
 515-include include/config/auto.conf
 516
 517ifeq ($(KBUILD_EXTMOD),)
 518# Read in dependencies to all Kconfig* files, make sure to run
 519# oldconfig if changes are detected.
 520-include include/config/auto.conf.cmd
 521
 522# To avoid any implicit rule to kick in, define an empty command
 523$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 524
 525# If .config is newer than include/config/auto.conf, someone tinkered
 526# with it and forgot to run make oldconfig.
 527# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 528# we execute the config step to be sure to catch updated Kconfig files
 529include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 530        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 531else
 532# external modules needs include/generated/autoconf.h and include/config/auto.conf
 533# but do not care if they are up-to-date. Use auto.conf to trigger the test
 534PHONY += include/config/auto.conf
 535
 536include/config/auto.conf:
 537        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 538        echo >&2;                                                       \
 539        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 540        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 541        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 542        echo >&2 ;                                                      \
 543        /bin/false)
 544
 545endif # KBUILD_EXTMOD
 546
 547else
 548# Dummy target needed, because used as prerequisite
 549include/config/auto.conf: ;
 550endif # $(dot-config)
 551
 552# The all: target is the default when no target is given on the
 553# command line.
 554# This allow a user to issue only 'make' to build a kernel including modules
 555# Defaults to vmlinux, but the arch makefile usually adds further targets
 556all: vmlinux
 557
 558ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 559KBUILD_CFLAGS   += -Os
 560else
 561KBUILD_CFLAGS   += -O2
 562endif
 563
 564include $(srctree)/arch/$(SRCARCH)/Makefile
 565
 566ifdef CONFIG_READABLE_ASM
 567# Disable optimizations that make assembler listings hard to read.
 568# reorder blocks reorders the control in the function
 569# ipa clone creates specialized cloned functions
 570# partial inlining inlines only parts of functions
 571KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 572                 $(call cc-option,-fno-ipa-cp-clone,) \
 573                 $(call cc-option,-fno-partial-inlining)
 574endif
 575
 576ifneq ($(CONFIG_FRAME_WARN),0)
 577KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 578endif
 579
 580# Force gcc to behave correct even for buggy distributions
 581ifndef CONFIG_CC_STACKPROTECTOR
 582KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 583endif
 584
 585# This warning generated too much noise in a regular build.
 586# Use make W=1 to enable this warning (see scripts/Makefile.build)
 587KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 588
 589ifdef CONFIG_FRAME_POINTER
 590KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 591else
 592# Some targets (ARM with Thumb2, for example), can't be built with frame
 593# pointers.  For those, we don't have FUNCTION_TRACER automatically
 594# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 595# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 596# -fomit-frame-pointer with FUNCTION_TRACER.
 597ifndef CONFIG_FUNCTION_TRACER
 598KBUILD_CFLAGS   += -fomit-frame-pointer
 599endif
 600endif
 601
 602ifdef CONFIG_DEBUG_INFO
 603KBUILD_CFLAGS   += -g
 604KBUILD_AFLAGS   += -gdwarf-2
 605endif
 606
 607ifdef CONFIG_DEBUG_INFO_REDUCED
 608KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 609endif
 610
 611ifdef CONFIG_FUNCTION_TRACER
 612KBUILD_CFLAGS   += -pg
 613ifdef CONFIG_DYNAMIC_FTRACE
 614        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 615                BUILD_C_RECORDMCOUNT := y
 616                export BUILD_C_RECORDMCOUNT
 617        endif
 618endif
 619endif
 620
 621# We trigger additional mismatches with less inlining
 622ifdef CONFIG_DEBUG_SECTION_MISMATCH
 623KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 624endif
 625
 626# arch Makefile may override CC so keep this after arch Makefile is included
 627NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 628CHECKFLAGS     += $(NOSTDINC_FLAGS)
 629
 630# warn about C99 declaration after statement
 631KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 632
 633# disable pointer signed / unsigned warnings in gcc 4.0
 634KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 635
 636# disable invalid "can't wrap" optimizations for signed / pointers
 637KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 638
 639# conserve stack if available
 640KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 641
 642# use the deterministic mode of AR if available
 643KBUILD_ARFLAGS := $(call ar-option,D)
 644
 645# check for 'asm goto'
 646ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 647        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 648endif
 649
 650# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 651# But warn user when we do so
 652warn-assign = \
 653$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 654
 655ifneq ($(KCPPFLAGS),)
 656        $(call warn-assign,CPPFLAGS)
 657        KBUILD_CPPFLAGS += $(KCPPFLAGS)
 658endif
 659ifneq ($(KAFLAGS),)
 660        $(call warn-assign,AFLAGS)
 661        KBUILD_AFLAGS += $(KAFLAGS)
 662endif
 663ifneq ($(KCFLAGS),)
 664        $(call warn-assign,CFLAGS)
 665        KBUILD_CFLAGS += $(KCFLAGS)
 666endif
 667
 668# Use --build-id when available.
 669LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 670                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 671KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 672LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 673
 674ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 675LDFLAGS_vmlinux += $(call ld-option, -X,)
 676endif
 677
 678# Default kernel image to build when no specific target is given.
 679# KBUILD_IMAGE may be overruled on the command line or
 680# set in the environment
 681# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 682# this default value
 683export KBUILD_IMAGE ?= vmlinux
 684
 685#
 686# INSTALL_PATH specifies where to place the updated kernel and system map
 687# images. Default is /boot, but you can set it to other values
 688export  INSTALL_PATH ?= /boot
 689
 690#
 691# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 692# relocations required by build roots.  This is not defined in the
 693# makefile but the argument can be passed to make if needed.
 694#
 695
 696MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 697export MODLIB
 698
 699#
 700#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 701#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 702#  the default option --strip-debug will be used.  Otherwise,
 703#  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 704
 705ifdef INSTALL_MOD_STRIP
 706ifeq ($(INSTALL_MOD_STRIP),1)
 707mod_strip_cmd = $(STRIP) --strip-debug
 708else
 709mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 710endif # INSTALL_MOD_STRIP=1
 711else
 712mod_strip_cmd = true
 713endif # INSTALL_MOD_STRIP
 714export mod_strip_cmd
 715
 716
 717ifeq ($(KBUILD_EXTMOD),)
 718core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 719
 720vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 721                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 722                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 723
 724vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 725                     $(init-n) $(init-) \
 726                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 727                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 728
 729init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 730core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 731drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 732net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 733libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 734libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 735libs-y          := $(libs-y1) $(libs-y2)
 736
 737# Externally visible symbols (used by link-vmlinux.sh)
 738export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 739export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 740export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 741export LDFLAGS_vmlinux
 742
 743vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 744
 745# Final link of vmlinux
 746      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 747quiet_cmd_link-vmlinux = LINK    $@
 748
 749# Include targets which we want to
 750# execute if the rest of the kernel build went well.
 751vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 752ifdef CONFIG_HEADERS_CHECK
 753        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 754endif
 755ifdef CONFIG_SAMPLES
 756        $(Q)$(MAKE) $(build)=samples
 757endif
 758ifdef CONFIG_BUILD_DOCSRC
 759        $(Q)$(MAKE) $(build)=Documentation
 760endif
 761        +$(call if_changed,link-vmlinux)
 762
 763# The actual objects are generated when descending, 
 764# make sure no implicit rule kicks in
 765$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 766
 767# Handle descending into subdirectories listed in $(vmlinux-dirs)
 768# Preset locale variables to speed up the build process. Limit locale
 769# tweaks to this spot to avoid wrong language settings when running
 770# make menuconfig etc.
 771# Error messages still appears in the original language
 772
 773PHONY += $(vmlinux-dirs)
 774$(vmlinux-dirs): prepare scripts
 775        $(Q)$(MAKE) $(build)=$@
 776
 777# Store (new) KERNELRELASE string in include/config/kernel.release
 778include/config/kernel.release: include/config/auto.conf FORCE
 779        $(Q)rm -f $@
 780        $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 781
 782
 783# Things we need to do before we recursively start building the kernel
 784# or the modules are listed in "prepare".
 785# A multi level approach is used. prepareN is processed before prepareN-1.
 786# archprepare is used in arch Makefiles and when processed asm symlink,
 787# version.h and scripts_basic is processed / created.
 788
 789# Listed in dependency order
 790PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 791
 792# prepare3 is used to check if we are building in a separate output directory,
 793# and if so do:
 794# 1) Check that make has not been executed in the kernel src $(srctree)
 795prepare3: include/config/kernel.release
 796ifneq ($(KBUILD_SRC),)
 797        @$(kecho) '  Using $(srctree) as source for kernel'
 798        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 799                echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 800                echo >&2 "  in the '$(srctree)' directory.";\
 801                /bin/false; \
 802        fi;
 803endif
 804
 805# prepare2 creates a makefile if using a separate output directory
 806prepare2: prepare3 outputmakefile asm-generic
 807
 808prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 809                   include/config/auto.conf
 810        $(cmd_crmodverdir)
 811
 812archprepare: archheaders archscripts prepare1 scripts_basic
 813
 814prepare0: archprepare FORCE
 815        $(Q)$(MAKE) $(build)=.
 816
 817# All the preparing..
 818prepare: prepare0
 819
 820# Generate some files
 821# ---------------------------------------------------------------------------
 822
 823# KERNELRELEASE can change from a few different places, meaning version.h
 824# needs to be updated, so this check is forced on all builds
 825
 826uts_len := 64
 827define filechk_utsrelease.h
 828        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 829          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 830          exit 1;                                                         \
 831        fi;                                                               \
 832        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 833endef
 834
 835define filechk_version.h
 836        (echo \#define LINUX_VERSION_CODE $(shell                         \
 837        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 838        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 839endef
 840
 841include/linux/version.h: $(srctree)/Makefile FORCE
 842        $(call filechk,version.h)
 843
 844include/generated/utsrelease.h: include/config/kernel.release FORCE
 845        $(call filechk,utsrelease.h)
 846
 847PHONY += headerdep
 848headerdep:
 849        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 850        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 851
 852# ---------------------------------------------------------------------------
 853
 854PHONY += depend dep
 855depend dep:
 856        @echo '*** Warning: make $@ is unnecessary now.'
 857
 858# ---------------------------------------------------------------------------
 859# Firmware install
 860INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 861export INSTALL_FW_PATH
 862
 863PHONY += firmware_install
 864firmware_install: FORCE
 865        @mkdir -p $(objtree)/firmware
 866        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 867
 868# ---------------------------------------------------------------------------
 869# Kernel headers
 870
 871#Default location for installed headers
 872export INSTALL_HDR_PATH = $(objtree)/usr
 873
 874hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 875
 876# If we do an all arch process set dst to asm-$(hdr-arch)
 877hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 878
 879PHONY += archheaders
 880archheaders:
 881
 882PHONY += archscripts
 883archscripts:
 884
 885PHONY += __headers
 886__headers: include/linux/version.h scripts_basic asm-generic archheaders archscripts FORCE
 887        $(Q)$(MAKE) $(build)=scripts build_unifdef
 888
 889PHONY += headers_install_all
 890headers_install_all:
 891        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
 892
 893PHONY += headers_install
 894headers_install: __headers
 895        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
 896        $(error Headers not exportable for the $(SRCARCH) architecture))
 897        $(Q)$(MAKE) $(hdr-inst)=include
 898        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
 899
 900PHONY += headers_check_all
 901headers_check_all: headers_install_all
 902        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
 903
 904PHONY += headers_check
 905headers_check: headers_install
 906        $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
 907        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
 908
 909# ---------------------------------------------------------------------------
 910# Modules
 911
 912ifdef CONFIG_MODULES
 913
 914# By default, build modules as well
 915
 916all: modules
 917
 918#       Build modules
 919#
 920#       A module can be listed more than once in obj-m resulting in
 921#       duplicate lines in modules.order files.  Those are removed
 922#       using awk while concatenating to the final file.
 923
 924PHONY += modules
 925modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
 926        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
 927        @$(kecho) '  Building modules, stage 2.';
 928        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 929        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
 930
 931modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
 932        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
 933
 934%/modules.builtin: include/config/auto.conf
 935        $(Q)$(MAKE) $(modbuiltin)=$*
 936
 937
 938# Target to prepare building external modules
 939PHONY += modules_prepare
 940modules_prepare: prepare scripts
 941
 942# Target to install modules
 943PHONY += modules_install
 944modules_install: _modinst_ _modinst_post
 945
 946PHONY += _modinst_
 947_modinst_:
 948        @rm -rf $(MODLIB)/kernel
 949        @rm -f $(MODLIB)/source
 950        @mkdir -p $(MODLIB)/kernel
 951        @ln -s $(srctree) $(MODLIB)/source
 952        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 953                rm -f $(MODLIB)/build ; \
 954                ln -s $(objtree) $(MODLIB)/build ; \
 955        fi
 956        @cp -f $(objtree)/modules.order $(MODLIB)/
 957        @cp -f $(objtree)/modules.builtin $(MODLIB)/
 958        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
 959
 960# This depmod is only for convenience to give the initial
 961# boot a modules.dep even before / is mounted read-write.  However the
 962# boot script depmod is the master version.
 963PHONY += _modinst_post
 964_modinst_post: _modinst_
 965        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
 966        $(call cmd,depmod)
 967
 968else # CONFIG_MODULES
 969
 970# Modules not configured
 971# ---------------------------------------------------------------------------
 972
 973modules modules_install: FORCE
 974        @echo >&2
 975        @echo >&2 "The present kernel configuration has modules disabled."
 976        @echo >&2 "Type 'make config' and enable loadable module support."
 977        @echo >&2 "Then build a kernel with module support enabled."
 978        @echo >&2
 979        @exit 1
 980
 981endif # CONFIG_MODULES
 982
 983###
 984# Cleaning is done on three levels.
 985# make clean     Delete most generated files
 986#                Leave enough to build external modules
 987# make mrproper  Delete the current configuration, and all generated files
 988# make distclean Remove editor backup files, patch leftover files and the like
 989
 990# Directories & files removed with 'make clean'
 991CLEAN_DIRS  += $(MODVERDIR)
 992
 993# Directories & files removed with 'make mrproper'
 994MRPROPER_DIRS  += include/config usr/include include/generated          \
 995                  arch/*/include/generated
 996MRPROPER_FILES += .config .config.old .version .old_version             \
 997                  include/linux/version.h                               \
 998                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
 999
1000# clean - Delete most, but leave enough to build external modules
1001#
1002clean: rm-dirs  := $(CLEAN_DIRS)
1003clean: rm-files := $(CLEAN_FILES)
1004clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1005
1006PHONY += $(clean-dirs) clean archclean
1007$(clean-dirs):
1008        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1009
1010clean: archclean
1011
1012# mrproper - Delete all generated files, including .config
1013#
1014mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1015mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1016mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1017
1018PHONY += $(mrproper-dirs) mrproper archmrproper
1019$(mrproper-dirs):
1020        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1021
1022mrproper: clean archmrproper $(mrproper-dirs)
1023        $(call cmd,rmdirs)
1024        $(call cmd,rmfiles)
1025
1026# distclean
1027#
1028PHONY += distclean
1029
1030distclean: mrproper
1031        @find $(srctree) $(RCS_FIND_IGNORE) \
1032                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1033                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1034                -o -name '.*.rej' \
1035                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1036                -type f -print | xargs rm -f
1037
1038
1039# Packaging of the kernel to various formats
1040# ---------------------------------------------------------------------------
1041# rpm target kept for backward compatibility
1042package-dir     := $(srctree)/scripts/package
1043
1044%src-pkg: FORCE
1045        $(Q)$(MAKE) $(build)=$(package-dir) $@
1046%pkg: include/config/kernel.release FORCE
1047        $(Q)$(MAKE) $(build)=$(package-dir) $@
1048rpm: include/config/kernel.release FORCE
1049        $(Q)$(MAKE) $(build)=$(package-dir) $@
1050
1051
1052# Brief documentation of the typical targets used
1053# ---------------------------------------------------------------------------
1054
1055boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1056boards := $(notdir $(boards))
1057board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1058board-dirs := $(sort $(notdir $(board-dirs:/=)))
1059
1060help:
1061        @echo  'Cleaning targets:'
1062        @echo  '  clean           - Remove most generated files but keep the config and'
1063        @echo  '                    enough build support to build external modules'
1064        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1065        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1066        @echo  ''
1067        @echo  'Configuration targets:'
1068        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1069        @echo  ''
1070        @echo  'Other generic targets:'
1071        @echo  '  all             - Build all targets marked with [*]'
1072        @echo  '* vmlinux         - Build the bare kernel'
1073        @echo  '* modules         - Build all modules'
1074        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1075        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1076        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1077        @echo  '  dir/            - Build all files in dir and below'
1078        @echo  '  dir/file.[oisS] - Build specified target only'
1079        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1080        @echo  '                    (requires a recent binutils and recent build (System.map))'
1081        @echo  '  dir/file.ko     - Build module including final link'
1082        @echo  '  modules_prepare - Set up for building external modules'
1083        @echo  '  tags/TAGS       - Generate tags file for editors'
1084        @echo  '  cscope          - Generate cscope index'
1085        @echo  '  gtags           - Generate GNU GLOBAL index'
1086        @echo  '  kernelrelease   - Output the release version string'
1087        @echo  '  kernelversion   - Output the version stored in Makefile'
1088        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1089         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1090         echo  ''
1091        @echo  'Static analysers'
1092        @echo  '  checkstack      - Generate a list of stack hogs'
1093        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1094        @echo  '  versioncheck    - Sanity check on version.h usage'
1095        @echo  '  includecheck    - Check for duplicate included header files'
1096        @echo  '  export_report   - List the usages of all exported symbols'
1097        @echo  '  headers_check   - Sanity check on exported headers'
1098        @echo  '  headerdep       - Detect inclusion cycles in headers'
1099        @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1100        @echo  ''
1101        @echo  'Kernel packaging:'
1102        @$(MAKE) $(build)=$(package-dir) help
1103        @echo  ''
1104        @echo  'Documentation targets:'
1105        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1106        @echo  ''
1107        @echo  'Architecture specific targets ($(SRCARCH)):'
1108        @$(if $(archhelp),$(archhelp),\
1109                echo '  No architecture specific help defined for $(SRCARCH)')
1110        @echo  ''
1111        @$(if $(boards), \
1112                $(foreach b, $(boards), \
1113                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1114                echo '')
1115        @$(if $(board-dirs), \
1116                $(foreach b, $(board-dirs), \
1117                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1118                printf "  %-16s - Show all of the above\\n" help-boards; \
1119                echo '')
1120
1121        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1122        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1123        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1124        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1125        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1126        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1127        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1128        @echo  '                1: warnings which may be relevant and do not occur too often'
1129        @echo  '                2: warnings which occur quite often but may still be relevant'
1130        @echo  '                3: more obscure warnings, can most likely be ignored'
1131        @echo  '                Multiple levels can be combined with W=12 or W=123'
1132        @echo  ''
1133        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1134        @echo  'For further info see the ./README file'
1135
1136
1137help-board-dirs := $(addprefix help-,$(board-dirs))
1138
1139help-boards: $(help-board-dirs)
1140
1141boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1142
1143$(help-board-dirs): help-%:
1144        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1145        @$(if $(boards-per-dir), \
1146                $(foreach b, $(boards-per-dir), \
1147                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1148                echo '')
1149
1150
1151# Documentation targets
1152# ---------------------------------------------------------------------------
1153%docs: scripts_basic FORCE
1154        $(Q)$(MAKE) $(build)=scripts build_docproc
1155        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1156
1157else # KBUILD_EXTMOD
1158
1159###
1160# External module support.
1161# When building external modules the kernel used as basis is considered
1162# read-only, and no consistency checks are made and the make
1163# system is not used on the basis kernel. If updates are required
1164# in the basis kernel ordinary make commands (without M=...) must
1165# be used.
1166#
1167# The following are the only valid targets when building external
1168# modules.
1169# make M=dir clean     Delete all automatically generated files
1170# make M=dir modules   Make all modules in specified dir
1171# make M=dir           Same as 'make M=dir modules'
1172# make M=dir modules_install
1173#                      Install the modules built in the module directory
1174#                      Assumes install directory is already created
1175
1176# We are always building modules
1177KBUILD_MODULES := 1
1178PHONY += crmodverdir
1179crmodverdir:
1180        $(cmd_crmodverdir)
1181
1182PHONY += $(objtree)/Module.symvers
1183$(objtree)/Module.symvers:
1184        @test -e $(objtree)/Module.symvers || ( \
1185        echo; \
1186        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1187        echo "           is missing; modules will have no dependencies and modversions."; \
1188        echo )
1189
1190module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1191PHONY += $(module-dirs) modules
1192$(module-dirs): crmodverdir $(objtree)/Module.symvers
1193        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1194
1195modules: $(module-dirs)
1196        @$(kecho) '  Building modules, stage 2.';
1197        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1198
1199PHONY += modules_install
1200modules_install: _emodinst_ _emodinst_post
1201
1202install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1203PHONY += _emodinst_
1204_emodinst_:
1205        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1206        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1207
1208PHONY += _emodinst_post
1209_emodinst_post: _emodinst_
1210        $(call cmd,depmod)
1211
1212clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1213
1214PHONY += $(clean-dirs) clean
1215$(clean-dirs):
1216        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1217
1218clean:  rm-dirs := $(MODVERDIR)
1219clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1220
1221help:
1222        @echo  '  Building external modules.'
1223        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1224        @echo  ''
1225        @echo  '  modules         - default target, build the module(s)'
1226        @echo  '  modules_install - install the module'
1227        @echo  '  clean           - remove generated files in module directory only'
1228        @echo  ''
1229
1230# Dummies...
1231PHONY += prepare scripts
1232prepare: ;
1233scripts: ;
1234endif # KBUILD_EXTMOD
1235
1236clean: $(clean-dirs)
1237        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1238        $(call cmd,rmdirs)
1239        $(call cmd,rmfiles)
1240        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1241                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1242                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1243                -o -name '*.symtypes' -o -name 'modules.order' \
1244                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1245                -o -name '*.gcno' \) -type f -print | xargs rm -f
1246
1247# Generate tags for editors
1248# ---------------------------------------------------------------------------
1249quiet_cmd_tags = GEN     $@
1250      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1251
1252tags TAGS cscope gtags: FORCE
1253        $(call cmd,tags)
1254
1255# Scripts to check various things for consistency
1256# ---------------------------------------------------------------------------
1257
1258PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1259
1260includecheck:
1261        find $(srctree)/* $(RCS_FIND_IGNORE) \
1262                -name '*.[hcS]' -type f -print | sort \
1263                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1264
1265versioncheck:
1266        find $(srctree)/* $(RCS_FIND_IGNORE) \
1267                -name '*.[hcS]' -type f -print | sort \
1268                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1269
1270coccicheck:
1271        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1272
1273namespacecheck:
1274        $(PERL) $(srctree)/scripts/namespace.pl
1275
1276export_report:
1277        $(PERL) $(srctree)/scripts/export_report.pl
1278
1279endif #ifeq ($(config-targets),1)
1280endif #ifeq ($(mixed-targets),1)
1281
1282PHONY += checkstack kernelrelease kernelversion
1283
1284# UML needs a little special treatment here.  It wants to use the host
1285# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1286# else wants $(ARCH), including people doing cross-builds, which means
1287# that $(SUBARCH) doesn't work here.
1288ifeq ($(ARCH), um)
1289CHECKSTACK_ARCH := $(SUBARCH)
1290else
1291CHECKSTACK_ARCH := $(ARCH)
1292endif
1293checkstack:
1294        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1295        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1296
1297kernelrelease:
1298        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1299
1300kernelversion:
1301        @echo $(KERNELVERSION)
1302
1303# Clear a bunch of variables before executing the submake
1304tools/: FORCE
1305        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/
1306
1307tools/%: FORCE
1308        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ $*
1309
1310# Single targets
1311# ---------------------------------------------------------------------------
1312# Single targets are compatible with:
1313# - build with mixed source and output
1314# - build with separate output dir 'make O=...'
1315# - external modules
1316#
1317#  target-dir => where to store outputfile
1318#  build-dir  => directory in kernel source tree to use
1319
1320ifeq ($(KBUILD_EXTMOD),)
1321        build-dir  = $(patsubst %/,%,$(dir $@))
1322        target-dir = $(dir $@)
1323else
1324        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1325        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1326        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1327endif
1328
1329%.s: %.c prepare scripts FORCE
1330        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1331%.i: %.c prepare scripts FORCE
1332        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1333%.o: %.c prepare scripts FORCE
1334        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1335%.lst: %.c prepare scripts FORCE
1336        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1337%.s: %.S prepare scripts FORCE
1338        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1339%.o: %.S prepare scripts FORCE
1340        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1341%.symtypes: %.c prepare scripts FORCE
1342        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1343
1344# Modules
1345/: prepare scripts FORCE
1346        $(cmd_crmodverdir)
1347        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1348        $(build)=$(build-dir)
1349%/: prepare scripts FORCE
1350        $(cmd_crmodverdir)
1351        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1352        $(build)=$(build-dir)
1353%.ko: prepare scripts FORCE
1354        $(cmd_crmodverdir)
1355        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1356        $(build)=$(build-dir) $(@:.ko=.o)
1357        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1358
1359# FIXME Should go into a make.lib or something 
1360# ===========================================================================
1361
1362quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1363      cmd_rmdirs = rm -rf $(rm-dirs)
1364
1365quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1366      cmd_rmfiles = rm -f $(rm-files)
1367
1368# Run depmod only if we have System.map and depmod is executable
1369quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1370      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1371                   $(KERNELRELEASE)
1372
1373# Create temporary dir for module support files
1374# clean it up only when building all modules
1375cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1376                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1377
1378# read all saved command lines
1379
1380targets := $(wildcard $(sort $(targets)))
1381cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1382
1383ifneq ($(cmd_files),)
1384  $(cmd_files): ;       # Do not try to update included dependency files
1385  include $(cmd_files)
1386endif
1387
1388# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1389# Usage:
1390# $(Q)$(MAKE) $(clean)=dir
1391clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1392
1393endif   # skip-makefile
1394
1395PHONY += FORCE
1396FORCE:
1397
1398# Declare the contents of the .PHONY variable as phony.  We keep that
1399# information in a variable so we can use it in if_changed and friends.
1400.PHONY: $(PHONY)
1401
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