linux/Makefile
<<
>>
Prefs
   1VERSION = 2
   2PATCHLEVEL = 6
   3SUBLEVEL = 28
   4EXTRAVERSION = .7
   5NAME = Erotic Pickled Herring
   6
   7# *DOCUMENTATION*
   8# To see a list of typical targets execute "make help"
   9# More info can be located in ./README
  10# Comments in this file are targeted only to the developer, do not
  11# expect to learn how to build the kernel reading this file.
  12
  13# Do not:
  14# o  use make's built-in rules and variables
  15#    (this increases performance and avoids hard-to-debug behaviour);
  16# o  print "Entering directory ...";
  17MAKEFLAGS += -rR --no-print-directory
  18
  19# We are using a recursive build, so we need to do a little thinking
  20# to get the ordering right.
  21#
  22# Most importantly: sub-Makefiles should only ever modify files in
  23# their own directory. If in some directory we have a dependency on
  24# a file in another dir (which doesn't happen often, but it's often
  25# unavoidable when linking the built-in.o targets which finally
  26# turn into vmlinux), we will call a sub make in that other dir, and
  27# after that we are sure that everything which is in that other dir
  28# is now up to date.
  29#
  30# The only cases where we need to modify files which have global
  31# effects are thus separated out and done before the recursive
  32# descending is started. They are now explicitly listed as the
  33# prepare rule.
  34
  35# To put more focus on warnings, be less verbose as default
  36# Use 'make V=1' to see the full commands
  37
  38ifdef V
  39  ifeq ("$(origin V)", "command line")
  40    KBUILD_VERBOSE = $(V)
  41  endif
  42endif
  43ifndef KBUILD_VERBOSE
  44  KBUILD_VERBOSE = 0
  45endif
  46
  47# Call a source code checker (by default, "sparse") as part of the
  48# C compilation.
  49#
  50# Use 'make C=1' to enable checking of only re-compiled files.
  51# Use 'make C=2' to enable checking of *all* source files, regardless
  52# of whether they are re-compiled or not.
  53#
  54# See the file "Documentation/sparse.txt" for more details, including
  55# where to get the "sparse" utility.
  56
  57ifdef C
  58  ifeq ("$(origin C)", "command line")
  59    KBUILD_CHECKSRC = $(C)
  60  endif
  61endif
  62ifndef KBUILD_CHECKSRC
  63  KBUILD_CHECKSRC = 0
  64endif
  65
  66# Use make M=dir to specify directory of external module to build
  67# Old syntax make ... SUBDIRS=$PWD is still supported
  68# Setting the environment variable KBUILD_EXTMOD take precedence
  69ifdef SUBDIRS
  70  KBUILD_EXTMOD ?= $(SUBDIRS)
  71endif
  72ifdef M
  73  ifeq ("$(origin M)", "command line")
  74    KBUILD_EXTMOD := $(M)
  75  endif
  76endif
  77
  78
  79# kbuild supports saving output files in a separate directory.
  80# To locate output files in a separate directory two syntaxes are supported.
  81# In both cases the working directory must be the root of the kernel src.
  82# 1) O=
  83# Use "make O=dir/to/store/output/files/"
  84#
  85# 2) Set KBUILD_OUTPUT
  86# Set the environment variable KBUILD_OUTPUT to point to the directory
  87# where the output files shall be placed.
  88# export KBUILD_OUTPUT=dir/to/store/output/files/
  89# make
  90#
  91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92# variable.
  93
  94
  95# KBUILD_SRC is set on invocation of make in OBJ directory
  96# KBUILD_SRC is not intended to be used by the regular user (for now)
  97ifeq ($(KBUILD_SRC),)
  98
  99# OK, Make called in directory where kernel src resides
 100# Do we want to locate output files in a separate directory?
 101ifdef O
 102  ifeq ("$(origin O)", "command line")
 103    KBUILD_OUTPUT := $(O)
 104  endif
 105endif
 106
 107# That's our default target when none is given on the command line
 108PHONY := _all
 109_all:
 110
 111# Cancel implicit rules on top Makefile
 112$(CURDIR)/Makefile Makefile: ;
 113
 114ifneq ($(KBUILD_OUTPUT),)
 115# Invoke a second make in the output directory, passing relevant variables
 116# check that the output directory actually exists
 117saved-output := $(KBUILD_OUTPUT)
 118KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 119$(if $(KBUILD_OUTPUT),, \
 120     $(error output directory "$(saved-output)" does not exist))
 121
 122PHONY += $(MAKECMDGOALS) sub-make
 123
 124$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 125        $(Q)@:
 126
 127sub-make: FORCE
 128        $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 129        KBUILD_SRC=$(CURDIR) \
 130        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 131        $(filter-out _all sub-make,$(MAKECMDGOALS))
 132
 133# Leave processing to above invocation of make
 134skip-makefile := 1
 135endif # ifneq ($(KBUILD_OUTPUT),)
 136endif # ifeq ($(KBUILD_SRC),)
 137
 138# We process the rest of the Makefile if this is the final invocation of make
 139ifeq ($(skip-makefile),)
 140
 141# If building an external module we do not care about the all: rule
 142# but instead _all depend on modules
 143PHONY += all
 144ifeq ($(KBUILD_EXTMOD),)
 145_all: all
 146else
 147_all: modules
 148endif
 149
 150srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 151TOPDIR          := $(srctree)
 152# FIXME - TOPDIR is obsolete, use srctree/objtree
 153objtree         := $(CURDIR)
 154src             := $(srctree)
 155obj             := $(objtree)
 156
 157VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159export srctree objtree VPATH TOPDIR
 160
 161
 162# SUBARCH tells the usermode build what the underlying arch is.  That is set
 163# first, and if a usermode build is happening, the "ARCH=um" on the command
 164# line overrides the setting of ARCH below.  If a native build is happening,
 165# then ARCH is assigned, getting whatever value it gets normally, and 
 166# SUBARCH is subsequently ignored.
 167
 168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                  -e s/sh.*/sh/ )
 173
 174# Cross compiling and selecting different set of gcc/bin-utils
 175# ---------------------------------------------------------------------------
 176#
 177# When performing cross compilation for other architectures ARCH shall be set
 178# to the target architecture. (See arch/* for the possibilities).
 179# ARCH can be set during invocation of make:
 180# make ARCH=ia64
 181# Another way is to have ARCH set in the environment.
 182# The default ARCH is the host where make is executed.
 183
 184# CROSS_COMPILE specify the prefix used for all executables used
 185# during compilation. Only gcc and related bin-utils executables
 186# are prefixed with $(CROSS_COMPILE).
 187# CROSS_COMPILE can be set on the command line
 188# make CROSS_COMPILE=ia64-linux-
 189# Alternatively CROSS_COMPILE can be set in the environment.
 190# Default value for CROSS_COMPILE is not to prefix executables
 191# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192export KBUILD_BUILDHOST := $(SUBARCH)
 193ARCH            ?= $(SUBARCH)
 194CROSS_COMPILE   ?=
 195
 196# Architecture as present in compile.h
 197UTS_MACHINE     := $(ARCH)
 198SRCARCH         := $(ARCH)
 199
 200# Additional ARCH settings for x86
 201ifeq ($(ARCH),i386)
 202        SRCARCH := x86
 203endif
 204ifeq ($(ARCH),x86_64)
 205        SRCARCH := x86
 206endif
 207
 208# Where to locate arch specific headers
 209ifeq ($(ARCH),sparc64)
 210       hdr-arch  := sparc
 211else
 212       hdr-arch  := $(SRCARCH)
 213endif
 214
 215KCONFIG_CONFIG  ?= .config
 216
 217# SHELL used by kbuild
 218CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 219          else if [ -x /bin/bash ]; then echo /bin/bash; \
 220          else echo sh; fi ; fi)
 221
 222HOSTCC       = gcc
 223HOSTCXX      = g++
 224HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 225HOSTCXXFLAGS = -O2
 226
 227# Decide whether to build built-in, modular, or both.
 228# Normally, just do built-in.
 229
 230KBUILD_MODULES :=
 231KBUILD_BUILTIN := 1
 232
 233#       If we have only "make modules", don't compile built-in objects.
 234#       When we're building modules with modversions, we need to consider
 235#       the built-in objects during the descend as well, in order to
 236#       make sure the checksums are up to date before we record them.
 237
 238ifeq ($(MAKECMDGOALS),modules)
 239  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 240endif
 241
 242#       If we have "make <whatever> modules", compile modules
 243#       in addition to whatever we do anyway.
 244#       Just "make" or "make all" shall build modules as well
 245
 246ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 247  KBUILD_MODULES := 1
 248endif
 249
 250ifeq ($(MAKECMDGOALS),)
 251  KBUILD_MODULES := 1
 252endif
 253
 254export KBUILD_MODULES KBUILD_BUILTIN
 255export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 256
 257# Beautify output
 258# ---------------------------------------------------------------------------
 259#
 260# Normally, we echo the whole command before executing it. By making
 261# that echo $($(quiet)$(cmd)), we now have the possibility to set
 262# $(quiet) to choose other forms of output instead, e.g.
 263#
 264#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 265#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 266#
 267# If $(quiet) is empty, the whole command will be printed.
 268# If it is set to "quiet_", only the short version will be printed. 
 269# If it is set to "silent_", nothing will be printed at all, since
 270# the variable $(silent_cmd_cc_o_c) doesn't exist.
 271#
 272# A simple variant is to prefix commands with $(Q) - that's useful
 273# for commands that shall be hidden in non-verbose mode.
 274#
 275#       $(Q)ln $@ :<
 276#
 277# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 278# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 279
 280ifeq ($(KBUILD_VERBOSE),1)
 281  quiet =
 282  Q =
 283else
 284  quiet=quiet_
 285  Q = @
 286endif
 287
 288# If the user is running make -s (silent mode), suppress echoing of
 289# commands
 290
 291ifneq ($(findstring s,$(MAKEFLAGS)),)
 292  quiet=silent_
 293endif
 294
 295export quiet Q KBUILD_VERBOSE
 296
 297
 298# Look for make include files relative to root of kernel src
 299MAKEFLAGS += --include-dir=$(srctree)
 300
 301# We need some generic definitions (do not try to remake the file).
 302$(srctree)/scripts/Kbuild.include: ;
 303include $(srctree)/scripts/Kbuild.include
 304
 305# Make variables (CC, etc...)
 306
 307AS              = $(CROSS_COMPILE)as
 308LD              = $(CROSS_COMPILE)ld
 309CC              = $(CROSS_COMPILE)gcc
 310CPP             = $(CC) -E
 311AR              = $(CROSS_COMPILE)ar
 312NM              = $(CROSS_COMPILE)nm
 313STRIP           = $(CROSS_COMPILE)strip
 314OBJCOPY         = $(CROSS_COMPILE)objcopy
 315OBJDUMP         = $(CROSS_COMPILE)objdump
 316AWK             = awk
 317GENKSYMS        = scripts/genksyms/genksyms
 318DEPMOD          = /sbin/depmod
 319KALLSYMS        = scripts/kallsyms
 320PERL            = perl
 321CHECK           = sparse
 322
 323CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 324MODFLAGS        = -DMODULE
 325CFLAGS_MODULE   = $(MODFLAGS)
 326AFLAGS_MODULE   = $(MODFLAGS)
 327LDFLAGS_MODULE  =
 328CFLAGS_KERNEL   =
 329AFLAGS_KERNEL   =
 330
 331
 332# Use LINUXINCLUDE when you must reference the include/ directory.
 333# Needed to be compatible with the O= option
 334LINUXINCLUDE    := -Iinclude \
 335                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 336                   -I$(srctree)/arch/$(hdr-arch)/include               \
 337                   -include include/linux/autoconf.h
 338
 339KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
 340
 341KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 342                   -fno-strict-aliasing -fno-common \
 343                   -Werror-implicit-function-declaration
 344KBUILD_AFLAGS   := -D__ASSEMBLY__
 345
 346# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 347KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 348KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 349
 350export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 351export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 352export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 353export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 354
 355export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 356export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 357export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 358
 359# When compiling out-of-tree modules, put MODVERDIR in the module
 360# tree rather than in the kernel tree. The kernel tree might
 361# even be read-only.
 362export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 363
 364# Files to ignore in find ... statements
 365
 366RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 367export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 368
 369# ===========================================================================
 370# Rules shared between *config targets and build targets
 371
 372# Basic helpers built in scripts/
 373PHONY += scripts_basic
 374scripts_basic:
 375        $(Q)$(MAKE) $(build)=scripts/basic
 376
 377# To avoid any implicit rule to kick in, define an empty command.
 378scripts/basic/%: scripts_basic ;
 379
 380PHONY += outputmakefile
 381# outputmakefile generates a Makefile in the output directory, if using a
 382# separate output directory. This allows convenient use of make in the
 383# output directory.
 384outputmakefile:
 385ifneq ($(KBUILD_SRC),)
 386        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 387            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 388endif
 389
 390# To make sure we do not include .config for any of the *config targets
 391# catch them early, and hand them over to scripts/kconfig/Makefile
 392# It is allowed to specify more targets when calling make, including
 393# mixing *config targets and build targets.
 394# For example 'make oldconfig all'.
 395# Detect when mixed targets is specified, and make a second invocation
 396# of make so .config is not included in this case either (for *config).
 397
 398no-dot-config-targets := clean mrproper distclean \
 399                         cscope TAGS tags help %docs check% \
 400                         include/linux/version.h headers_% \
 401                         kernelrelease kernelversion
 402
 403config-targets := 0
 404mixed-targets  := 0
 405dot-config     := 1
 406
 407ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 408        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 409                dot-config := 0
 410        endif
 411endif
 412
 413ifeq ($(KBUILD_EXTMOD),)
 414        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 415                config-targets := 1
 416                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 417                        mixed-targets := 1
 418                endif
 419        endif
 420endif
 421
 422ifeq ($(mixed-targets),1)
 423# ===========================================================================
 424# We're called with mixed targets (*config and build targets).
 425# Handle them one by one.
 426
 427%:: FORCE
 428        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 429
 430else
 431ifeq ($(config-targets),1)
 432# ===========================================================================
 433# *config targets only - make sure prerequisites are updated, and descend
 434# in scripts/kconfig to make the *config target
 435
 436# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 437# KBUILD_DEFCONFIG may point out an alternative default configuration
 438# used for 'make defconfig'
 439include $(srctree)/arch/$(SRCARCH)/Makefile
 440export KBUILD_DEFCONFIG KBUILD_KCONFIG
 441
 442config %config: scripts_basic outputmakefile FORCE
 443        $(Q)mkdir -p include/linux include/config
 444        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 445
 446else
 447# ===========================================================================
 448# Build targets only - this includes vmlinux, arch specific targets, clean
 449# targets and others. In general all targets except *config targets.
 450
 451ifeq ($(KBUILD_EXTMOD),)
 452# Additional helpers built in scripts/
 453# Carefully list dependencies so we do not try to build scripts twice
 454# in parallel
 455PHONY += scripts
 456scripts: scripts_basic include/config/auto.conf
 457        $(Q)$(MAKE) $(build)=$(@)
 458
 459# Objects we will link into vmlinux / subdirs we need to visit
 460init-y          := init/
 461drivers-y       := drivers/ sound/ firmware/
 462net-y           := net/
 463libs-y          := lib/
 464core-y          := usr/
 465endif # KBUILD_EXTMOD
 466
 467ifeq ($(dot-config),1)
 468# Read in config
 469-include include/config/auto.conf
 470
 471ifeq ($(KBUILD_EXTMOD),)
 472# Read in dependencies to all Kconfig* files, make sure to run
 473# oldconfig if changes are detected.
 474-include include/config/auto.conf.cmd
 475
 476# To avoid any implicit rule to kick in, define an empty command
 477$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 478
 479# If .config is newer than include/config/auto.conf, someone tinkered
 480# with it and forgot to run make oldconfig.
 481# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 482# we execute the config step to be sure to catch updated Kconfig files
 483include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 484        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 485else
 486# external modules needs include/linux/autoconf.h and include/config/auto.conf
 487# but do not care if they are up-to-date. Use auto.conf to trigger the test
 488PHONY += include/config/auto.conf
 489
 490include/config/auto.conf:
 491        $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 492        echo;                                                           \
 493        echo "  ERROR: Kernel configuration is invalid.";               \
 494        echo "         include/linux/autoconf.h or $@ are missing.";    \
 495        echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 496        echo;                                                           \
 497        /bin/false)
 498
 499endif # KBUILD_EXTMOD
 500
 501else
 502# Dummy target needed, because used as prerequisite
 503include/config/auto.conf: ;
 504endif # $(dot-config)
 505
 506# The all: target is the default when no target is given on the
 507# command line.
 508# This allow a user to issue only 'make' to build a kernel including modules
 509# Defaults vmlinux but it is usually overridden in the arch makefile
 510all: vmlinux
 511
 512ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 513KBUILD_CFLAGS   += -Os
 514else
 515KBUILD_CFLAGS   += -O2
 516endif
 517
 518include $(srctree)/arch/$(SRCARCH)/Makefile
 519
 520ifneq (CONFIG_FRAME_WARN,0)
 521KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 522endif
 523
 524# Force gcc to behave correct even for buggy distributions
 525# Arch Makefiles may override this setting
 526KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 527
 528ifdef CONFIG_FRAME_POINTER
 529KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 530else
 531KBUILD_CFLAGS   += -fomit-frame-pointer
 532endif
 533
 534ifdef CONFIG_DEBUG_INFO
 535KBUILD_CFLAGS   += -g
 536KBUILD_AFLAGS   += -gdwarf-2
 537endif
 538
 539ifdef CONFIG_FUNCTION_TRACER
 540KBUILD_CFLAGS   += -pg
 541endif
 542
 543# We trigger additional mismatches with less inlining
 544ifdef CONFIG_DEBUG_SECTION_MISMATCH
 545KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 546endif
 547
 548# arch Makefile may override CC so keep this after arch Makefile is included
 549NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 550CHECKFLAGS     += $(NOSTDINC_FLAGS)
 551
 552# warn about C99 declaration after statement
 553KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 554
 555# disable pointer signed / unsigned warnings in gcc 4.0
 556KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 557
 558# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 559# But warn user when we do so
 560warn-assign = \
 561$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 562
 563ifneq ($(KCPPFLAGS),)
 564        $(call warn-assign,CPPFLAGS)
 565        KBUILD_CPPFLAGS += $(KCPPFLAGS)
 566endif
 567ifneq ($(KAFLAGS),)
 568        $(call warn-assign,AFLAGS)
 569        KBUILD_AFLAGS += $(KAFLAGS)
 570endif
 571ifneq ($(KCFLAGS),)
 572        $(call warn-assign,CFLAGS)
 573        KBUILD_CFLAGS += $(KCFLAGS)
 574endif
 575
 576# Use --build-id when available.
 577LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 578                              $(call ld-option, -Wl$(comma)--build-id,))
 579LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 580LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 581
 582# Default kernel image to build when no specific target is given.
 583# KBUILD_IMAGE may be overruled on the command line or
 584# set in the environment
 585# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 586# this default value
 587export KBUILD_IMAGE ?= vmlinux
 588
 589#
 590# INSTALL_PATH specifies where to place the updated kernel and system map
 591# images. Default is /boot, but you can set it to other values
 592export  INSTALL_PATH ?= /boot
 593
 594#
 595# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 596# relocations required by build roots.  This is not defined in the
 597# makefile but the argument can be passed to make if needed.
 598#
 599
 600MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 601export MODLIB
 602
 603#
 604#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 605#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 606#  the default option --strip-debug will be used.  Otherwise,
 607#  INSTALL_MOD_STRIP will used as the options to the strip command.
 608
 609ifdef INSTALL_MOD_STRIP
 610ifeq ($(INSTALL_MOD_STRIP),1)
 611mod_strip_cmd = $(STRIP) --strip-debug
 612else
 613mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 614endif # INSTALL_MOD_STRIP=1
 615else
 616mod_strip_cmd = true
 617endif # INSTALL_MOD_STRIP
 618export mod_strip_cmd
 619
 620
 621ifeq ($(KBUILD_EXTMOD),)
 622core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 623
 624vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 625                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 626                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 627
 628vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 629                     $(init-n) $(init-) \
 630                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 631                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 632
 633init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 634core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 635drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 636net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 637libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 638libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 639libs-y          := $(libs-y1) $(libs-y2)
 640
 641# Build vmlinux
 642# ---------------------------------------------------------------------------
 643# vmlinux is built from the objects selected by $(vmlinux-init) and
 644# $(vmlinux-main). Most are built-in.o files from top-level directories
 645# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 646# Ordering when linking is important, and $(vmlinux-init) must be first.
 647#
 648# vmlinux
 649#   ^
 650#   |
 651#   +-< $(vmlinux-init)
 652#   |   +--< init/version.o + more
 653#   |
 654#   +--< $(vmlinux-main)
 655#   |    +--< driver/built-in.o mm/built-in.o + more
 656#   |
 657#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 658#
 659# vmlinux version (uname -v) cannot be updated during normal
 660# descending-into-subdirs phase since we do not yet know if we need to
 661# update vmlinux.
 662# Therefore this step is delayed until just before final link of vmlinux -
 663# except in the kallsyms case where it is done just before adding the
 664# symbols to the kernel.
 665#
 666# System.map is generated to document addresses of all kernel symbols
 667
 668vmlinux-init := $(head-y) $(init-y)
 669vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 670vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 671vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 672export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 673
 674# Rule to link vmlinux - also used during CONFIG_KALLSYMS
 675# May be overridden by arch/$(ARCH)/Makefile
 676quiet_cmd_vmlinux__ ?= LD      $@
 677      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 678      -T $(vmlinux-lds) $(vmlinux-init)                          \
 679      --start-group $(vmlinux-main) --end-group                  \
 680      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 681
 682# Generate new vmlinux version
 683quiet_cmd_vmlinux_version = GEN     .version
 684      cmd_vmlinux_version = set -e;                     \
 685        if [ ! -r .version ]; then                      \
 686          rm -f .version;                               \
 687          echo 1 >.version;                             \
 688        else                                            \
 689          mv .version .old_version;                     \
 690          expr 0$$(cat .old_version) + 1 >.version;     \
 691        fi;                                             \
 692        $(MAKE) $(build)=init
 693
 694# Generate System.map
 695quiet_cmd_sysmap = SYSMAP
 696      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 697
 698# Link of vmlinux
 699# If CONFIG_KALLSYMS is set .version is already updated
 700# Generate System.map and verify that the content is consistent
 701# Use + in front of the vmlinux_version rule to silent warning with make -j2
 702# First command is ':' to allow us to use + in front of the rule
 703define rule_vmlinux__
 704        :
 705        $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 706
 707        $(call cmd,vmlinux__)
 708        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 709
 710        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 711          echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 712        $(cmd_sysmap) $@ System.map;                                         \
 713        if [ $$? -ne 0 ]; then                                               \
 714                rm -f $@;                                                    \
 715                /bin/false;                                                  \
 716        fi;
 717        $(verify_kallsyms)
 718endef
 719
 720
 721ifdef CONFIG_KALLSYMS
 722# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 723# It's a three stage process:
 724# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 725#   empty
 726#   Running kallsyms on that gives us .tmp_kallsyms1.o with
 727#   the right size - vmlinux version (uname -v) is updated during this step
 728# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 729#   but due to the added section, some addresses have shifted.
 730#   From here, we generate a correct .tmp_kallsyms2.o
 731# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 732# o Verify that the System.map from vmlinux matches the map from
 733#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 734# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 735#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 736#   temporary bypass to allow the kernel to be built while the
 737#   maintainers work out what went wrong with kallsyms.
 738
 739ifdef CONFIG_KALLSYMS_EXTRA_PASS
 740last_kallsyms := 3
 741else
 742last_kallsyms := 2
 743endif
 744
 745kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 746
 747define verify_kallsyms
 748        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 749          echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 750          $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 751        $(Q)cmp -s System.map .tmp_System.map ||                             \
 752                (echo Inconsistent kallsyms data;                            \
 753                 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 754                 rm .tmp_kallsyms* ; /bin/false )
 755endef
 756
 757# Update vmlinux version before link
 758# Use + in front of this rule to silent warning about make -j1
 759# First command is ':' to allow us to use + in front of this rule
 760cmd_ksym_ld = $(cmd_vmlinux__)
 761define rule_ksym_ld
 762        : 
 763        +$(call cmd,vmlinux_version)
 764        $(call cmd,vmlinux__)
 765        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 766endef
 767
 768# Generate .S file with all kernel symbols
 769quiet_cmd_kallsyms = KSYM    $@
 770      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 771                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 772
 773.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 774        $(call if_changed_dep,as_o_S)
 775
 776.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 777        $(call cmd,kallsyms)
 778
 779# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 780.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 781        $(call if_changed_rule,ksym_ld)
 782
 783.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 784        $(call if_changed,vmlinux__)
 785
 786.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 787        $(call if_changed,vmlinux__)
 788
 789# Needs to visit scripts/ before $(KALLSYMS) can be used.
 790$(KALLSYMS): scripts ;
 791
 792# Generate some data for debugging strange kallsyms problems
 793debug_kallsyms: .tmp_map$(last_kallsyms)
 794
 795.tmp_map%: .tmp_vmlinux% FORCE
 796        ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 797
 798.tmp_map3: .tmp_map2
 799
 800.tmp_map2: .tmp_map1
 801
 802endif # ifdef CONFIG_KALLSYMS
 803
 804# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 805# relevant sections renamed as per the linker script.
 806quiet_cmd_vmlinux-modpost = LD      $@
 807      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 808         $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 809         $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 810define rule_vmlinux-modpost
 811        :
 812        +$(call cmd,vmlinux-modpost)
 813        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 814        $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 815endef
 816
 817# vmlinux image - including updated kernel symbols
 818vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 819ifdef CONFIG_HEADERS_CHECK
 820        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 821endif
 822ifdef CONFIG_SAMPLES
 823        $(Q)$(MAKE) $(build)=samples
 824endif
 825ifdef CONFIG_BUILD_DOCSRC
 826        $(Q)$(MAKE) $(build)=Documentation
 827endif
 828        $(call vmlinux-modpost)
 829        $(call if_changed_rule,vmlinux__)
 830        $(Q)rm -f .old_version
 831
 832# build vmlinux.o first to catch section mismatch errors early
 833ifdef CONFIG_KALLSYMS
 834.tmp_vmlinux1: vmlinux.o
 835endif
 836
 837modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 838vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 839        $(call if_changed_rule,vmlinux-modpost)
 840
 841# The actual objects are generated when descending, 
 842# make sure no implicit rule kicks in
 843$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 844
 845# Handle descending into subdirectories listed in $(vmlinux-dirs)
 846# Preset locale variables to speed up the build process. Limit locale
 847# tweaks to this spot to avoid wrong language settings when running
 848# make menuconfig etc.
 849# Error messages still appears in the original language
 850
 851PHONY += $(vmlinux-dirs)
 852$(vmlinux-dirs): prepare scripts
 853        $(Q)$(MAKE) $(build)=$@
 854
 855# Build the kernel release string
 856#
 857# The KERNELRELEASE value built here is stored in the file
 858# include/config/kernel.release, and is used when executing several
 859# make targets, such as "make install" or "make modules_install."
 860#
 861# The eventual kernel release string consists of the following fields,
 862# shown in a hierarchical format to show how smaller parts are concatenated
 863# to form the larger and final value, with values coming from places like
 864# the Makefile, kernel config options, make command line options and/or
 865# SCM tag information.
 866#
 867#       $(KERNELVERSION)
 868#         $(VERSION)                    eg, 2
 869#         $(PATCHLEVEL)                 eg, 6
 870#         $(SUBLEVEL)                   eg, 18
 871#         $(EXTRAVERSION)               eg, -rc6
 872#       $(localver-full)
 873#         $(localver)
 874#           localversion*               (files without backups, containing '~')
 875#           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 876#         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 877#           ./scripts/setlocalversion   (SCM tag, if one exists)
 878#           $(LOCALVERSION)             (from make command line if provided)
 879#
 880#  Note how the final $(localver-auto) string is included *only* if the
 881# kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 882# moment, only git is supported but other SCMs can edit the script
 883# scripts/setlocalversion and add the appropriate checks as needed.
 884
 885pattern = ".*/localversion[^~]*"
 886string  = $(shell cat /dev/null \
 887           `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 888
 889localver = $(subst $(space),, $(string) \
 890                              $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 891
 892# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 893# and if the SCM is know a tag from the SCM is appended.
 894# The appended tag is determined by the SCM used.
 895#
 896# Currently, only git is supported.
 897# Other SCMs can edit scripts/setlocalversion and add the appropriate
 898# checks as needed.
 899ifdef CONFIG_LOCALVERSION_AUTO
 900        _localver-auto = $(shell $(CONFIG_SHELL) \
 901                          $(srctree)/scripts/setlocalversion $(srctree))
 902        localver-auto  = $(LOCALVERSION)$(_localver-auto)
 903endif
 904
 905localver-full = $(localver)$(localver-auto)
 906
 907# Store (new) KERNELRELASE string in include/config/kernel.release
 908kernelrelease = $(KERNELVERSION)$(localver-full)
 909include/config/kernel.release: include/config/auto.conf FORCE
 910        $(Q)rm -f $@
 911        $(Q)echo $(kernelrelease) > $@
 912
 913
 914# Things we need to do before we recursively start building the kernel
 915# or the modules are listed in "prepare".
 916# A multi level approach is used. prepareN is processed before prepareN-1.
 917# archprepare is used in arch Makefiles and when processed asm symlink,
 918# version.h and scripts_basic is processed / created.
 919
 920# Listed in dependency order
 921PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 922
 923# prepare3 is used to check if we are building in a separate output directory,
 924# and if so do:
 925# 1) Check that make has not been executed in the kernel src $(srctree)
 926# 2) Create the include2 directory, used for the second asm symlink
 927prepare3: include/config/kernel.release
 928ifneq ($(KBUILD_SRC),)
 929        @echo '  Using $(srctree) as source for kernel'
 930        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 931                echo "  $(srctree) is not clean, please run 'make mrproper'";\
 932                echo "  in the '$(srctree)' directory.";\
 933                /bin/false; \
 934        fi;
 935        $(Q)if [ ! -d include2 ]; then                                  \
 936            mkdir -p include2;                                          \
 937            ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 938        fi
 939endif
 940
 941# prepare2 creates a makefile if using a separate output directory
 942prepare2: prepare3 outputmakefile
 943
 944prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 945                   include/asm include/config/auto.conf
 946        $(cmd_crmodverdir)
 947
 948archprepare: prepare1 scripts_basic
 949
 950prepare0: archprepare FORCE
 951        $(Q)$(MAKE) $(build)=.
 952        $(Q)$(MAKE) $(build)=. missing-syscalls
 953
 954# All the preparing..
 955prepare: prepare0
 956
 957# Leave this as default for preprocessing vmlinux.lds.S, which is now
 958# done in arch/$(ARCH)/kernel/Makefile
 959
 960export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 961
 962# The asm symlink changes when $(ARCH) changes.
 963# Detect this and ask user to run make mrproper
 964# If asm is a stale symlink (point to dir that does not exist) remove it
 965define check-symlink
 966        set -e;                                                            \
 967        if [ -L include/asm ]; then                                        \
 968                asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
 969                if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
 970                        echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 971                        echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 972                        exit 1;                                            \
 973                fi;                                                        \
 974                test -e $$asmlink || rm include/asm;                       \
 975        elif [ -d include/asm ]; then                                      \
 976                echo "ERROR: $@ is a directory but a symlink was expected";\
 977                exit 1;                                                    \
 978        fi
 979endef
 980
 981# We create the target directory of the symlink if it does
 982# not exist so the test in chack-symlink works and we have a
 983# directory for generated filesas used by some architectures.
 984define create-symlink
 985        if [ ! -L include/asm ]; then                                      \
 986                        echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';     \
 987                        if [ ! -d include/asm-$(SRCARCH) ]; then           \
 988                                mkdir -p include/asm-$(SRCARCH);           \
 989                        fi;                                                \
 990                        ln -fsn asm-$(SRCARCH) $@;                         \
 991        fi
 992endef
 993
 994include/asm: FORCE
 995        $(Q)$(check-symlink)
 996        $(Q)$(create-symlink)
 997
 998# Generate some files
 999# ---------------------------------------------------------------------------
1000
1001# KERNELRELEASE can change from a few different places, meaning version.h
1002# needs to be updated, so this check is forced on all builds
1003
1004uts_len := 64
1005define filechk_utsrelease.h
1006        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1007          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1008          exit 1;                                                         \
1009        fi;                                                               \
1010        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1011endef
1012
1013define filechk_version.h
1014        (echo \#define LINUX_VERSION_CODE $(shell                             \
1015        expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1016        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1017endef
1018
1019include/linux/version.h: $(srctree)/Makefile FORCE
1020        $(call filechk,version.h)
1021
1022include/linux/utsrelease.h: include/config/kernel.release FORCE
1023        $(call filechk,utsrelease.h)
1024
1025# ---------------------------------------------------------------------------
1026
1027PHONY += depend dep
1028depend dep:
1029        @echo '*** Warning: make $@ is unnecessary now.'
1030
1031# ---------------------------------------------------------------------------
1032# Firmware install
1033INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1034export INSTALL_FW_PATH
1035
1036PHONY += firmware_install
1037firmware_install: FORCE
1038        @mkdir -p $(objtree)/firmware
1039        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1040
1041# ---------------------------------------------------------------------------
1042# Kernel headers
1043
1044#Default location for installed headers
1045export INSTALL_HDR_PATH = $(objtree)/usr
1046
1047hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1048# Find out where the Kbuild file is located to support
1049# arch/$(ARCH)/include/asm
1050hdr-dir = $(strip                                                         \
1051          $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1052               arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1053
1054# If we do an all arch process set dst to asm-$(hdr-arch)
1055hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1056
1057PHONY += __headers
1058__headers: include/linux/version.h scripts_basic FORCE
1059        $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1060
1061PHONY += headers_install_all
1062headers_install_all:
1063        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1064
1065PHONY += headers_install
1066headers_install: __headers
1067        $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1068        $(error Headers not exportable for the $(SRCARCH) architecture))
1069        $(Q)$(MAKE) $(hdr-inst)=include
1070        $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1071
1072PHONY += headers_check_all
1073headers_check_all: headers_install_all
1074        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1075
1076PHONY += headers_check
1077headers_check: headers_install
1078        $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1079        $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1080
1081# ---------------------------------------------------------------------------
1082# Modules
1083
1084ifdef CONFIG_MODULES
1085
1086# By default, build modules as well
1087
1088all: modules
1089
1090#       Build modules
1091#
1092#       A module can be listed more than once in obj-m resulting in
1093#       duplicate lines in modules.order files.  Those are removed
1094#       using awk while concatenating to the final file.
1095
1096PHONY += modules
1097modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1098        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1099        @echo '  Building modules, stage 2.';
1100        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1101        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1102
1103
1104# Target to prepare building external modules
1105PHONY += modules_prepare
1106modules_prepare: prepare scripts
1107
1108# Target to install modules
1109PHONY += modules_install
1110modules_install: _modinst_ _modinst_post
1111
1112PHONY += _modinst_
1113_modinst_:
1114        @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1115                echo "Warning: you may need to install module-init-tools"; \
1116                echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1117                sleep 1; \
1118        fi
1119        @rm -rf $(MODLIB)/kernel
1120        @rm -f $(MODLIB)/source
1121        @mkdir -p $(MODLIB)/kernel
1122        @ln -s $(srctree) $(MODLIB)/source
1123        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1124                rm -f $(MODLIB)/build ; \
1125                ln -s $(objtree) $(MODLIB)/build ; \
1126        fi
1127        @cp -f $(objtree)/modules.order $(MODLIB)/
1128        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1129
1130# This depmod is only for convenience to give the initial
1131# boot a modules.dep even before / is mounted read-write.  However the
1132# boot script depmod is the master version.
1133PHONY += _modinst_post
1134_modinst_post: _modinst_
1135        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1136        $(call cmd,depmod)
1137
1138else # CONFIG_MODULES
1139
1140# Modules not configured
1141# ---------------------------------------------------------------------------
1142
1143modules modules_install: FORCE
1144        @echo
1145        @echo "The present kernel configuration has modules disabled."
1146        @echo "Type 'make config' and enable loadable module support."
1147        @echo "Then build a kernel with module support enabled."
1148        @echo
1149        @exit 1
1150
1151endif # CONFIG_MODULES
1152
1153###
1154# Cleaning is done on three levels.
1155# make clean     Delete most generated files
1156#                Leave enough to build external modules
1157# make mrproper  Delete the current configuration, and all generated files
1158# make distclean Remove editor backup files, patch leftover files and the like
1159
1160# Directories & files removed with 'make clean'
1161CLEAN_DIRS  += $(MODVERDIR)
1162CLEAN_FILES +=  vmlinux System.map \
1163                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1164
1165# Directories & files removed with 'make mrproper'
1166MRPROPER_DIRS  += include/config include2 usr/include
1167MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1168                  include/linux/autoconf.h include/linux/version.h      \
1169                  include/linux/utsrelease.h                            \
1170                  include/linux/bounds.h include/asm*/asm-offsets.h     \
1171                  Module.symvers Module.markers tags TAGS cscope*
1172
1173# clean - Delete most, but leave enough to build external modules
1174#
1175clean: rm-dirs  := $(CLEAN_DIRS)
1176clean: rm-files := $(CLEAN_FILES)
1177clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1178
1179PHONY += $(clean-dirs) clean archclean
1180$(clean-dirs):
1181        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1182
1183clean: archclean $(clean-dirs)
1184        $(call cmd,rmdirs)
1185        $(call cmd,rmfiles)
1186        @find . $(RCS_FIND_IGNORE) \
1187                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1188                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1189                -o -name '*.symtypes' -o -name 'modules.order' \
1190                -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1191                -type f -print | xargs rm -f
1192
1193# mrproper - Delete all generated files, including .config
1194#
1195mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1196mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1197mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1198
1199PHONY += $(mrproper-dirs) mrproper archmrproper
1200$(mrproper-dirs):
1201        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1202
1203mrproper: clean archmrproper $(mrproper-dirs)
1204        $(call cmd,rmdirs)
1205        $(call cmd,rmfiles)
1206
1207# distclean
1208#
1209PHONY += distclean
1210
1211distclean: mrproper
1212        @find $(srctree) $(RCS_FIND_IGNORE) \
1213                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1214                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1215                -o -name '.*.rej' -o -size 0 \
1216                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1217                -type f -print | xargs rm -f
1218
1219
1220# Packaging of the kernel to various formats
1221# ---------------------------------------------------------------------------
1222# rpm target kept for backward compatibility
1223package-dir     := $(srctree)/scripts/package
1224
1225%pkg: include/config/kernel.release FORCE
1226        $(Q)$(MAKE) $(build)=$(package-dir) $@
1227rpm: include/config/kernel.release FORCE
1228        $(Q)$(MAKE) $(build)=$(package-dir) $@
1229
1230
1231# Brief documentation of the typical targets used
1232# ---------------------------------------------------------------------------
1233
1234boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1235boards := $(notdir $(boards))
1236board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1237board-dirs := $(sort $(notdir $(board-dirs:/=)))
1238
1239help:
1240        @echo  'Cleaning targets:'
1241        @echo  '  clean           - Remove most generated files but keep the config and'
1242        @echo  '                    enough build support to build external modules'
1243        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1244        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1245        @echo  ''
1246        @echo  'Configuration targets:'
1247        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1248        @echo  ''
1249        @echo  'Other generic targets:'
1250        @echo  '  all             - Build all targets marked with [*]'
1251        @echo  '* vmlinux         - Build the bare kernel'
1252        @echo  '* modules         - Build all modules'
1253        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1254        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1255        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1256        @echo  '  dir/            - Build all files in dir and below'
1257        @echo  '  dir/file.[ois]  - Build specified target only'
1258        @echo  '  dir/file.ko     - Build module including final link'
1259        @echo  '  prepare         - Set up for building external modules'
1260        @echo  '  tags/TAGS       - Generate tags file for editors'
1261        @echo  '  cscope          - Generate cscope index'
1262        @echo  '  kernelrelease   - Output the release version string'
1263        @echo  '  kernelversion   - Output the version stored in Makefile'
1264        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1265         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1266         echo  ''
1267        @echo  'Static analysers'
1268        @echo  '  checkstack      - Generate a list of stack hogs'
1269        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1270        @echo  '  versioncheck    - Sanity check on version.h usage'
1271        @echo  '  includecheck    - Check for duplicate included header files'
1272        @echo  '  export_report   - List the usages of all exported symbols'
1273        @echo  '  headers_check   - Sanity check on exported headers'; \
1274         echo  ''
1275        @echo  'Kernel packaging:'
1276        @$(MAKE) $(build)=$(package-dir) help
1277        @echo  ''
1278        @echo  'Documentation targets:'
1279        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1280        @echo  ''
1281        @echo  'Architecture specific targets ($(SRCARCH)):'
1282        @$(if $(archhelp),$(archhelp),\
1283                echo '  No architecture specific help defined for $(SRCARCH)')
1284        @echo  ''
1285        @$(if $(boards), \
1286                $(foreach b, $(boards), \
1287                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1288                echo '')
1289        @$(if $(board-dirs), \
1290                $(foreach b, $(board-dirs), \
1291                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1292                printf "  %-16s - Show all of the above\\n" help-boards; \
1293                echo '')
1294
1295        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1296        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1297        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1298        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1299        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1300        @echo  ''
1301        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1302        @echo  'For further info see the ./README file'
1303
1304
1305help-board-dirs := $(addprefix help-,$(board-dirs))
1306
1307help-boards: $(help-board-dirs)
1308
1309boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1310
1311$(help-board-dirs): help-%:
1312        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1313        @$(if $(boards-per-dir), \
1314                $(foreach b, $(boards-per-dir), \
1315                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1316                echo '')
1317
1318
1319# Documentation targets
1320# ---------------------------------------------------------------------------
1321%docs: scripts_basic FORCE
1322        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1323
1324else # KBUILD_EXTMOD
1325
1326###
1327# External module support.
1328# When building external modules the kernel used as basis is considered
1329# read-only, and no consistency checks are made and the make
1330# system is not used on the basis kernel. If updates are required
1331# in the basis kernel ordinary make commands (without M=...) must
1332# be used.
1333#
1334# The following are the only valid targets when building external
1335# modules.
1336# make M=dir clean     Delete all automatically generated files
1337# make M=dir modules   Make all modules in specified dir
1338# make M=dir           Same as 'make M=dir modules'
1339# make M=dir modules_install
1340#                      Install the modules built in the module directory
1341#                      Assumes install directory is already created
1342
1343# We are always building modules
1344KBUILD_MODULES := 1
1345PHONY += crmodverdir
1346crmodverdir:
1347        $(cmd_crmodverdir)
1348
1349PHONY += $(objtree)/Module.symvers
1350$(objtree)/Module.symvers:
1351        @test -e $(objtree)/Module.symvers || ( \
1352        echo; \
1353        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1354        echo "           is missing; modules will have no dependencies and modversions."; \
1355        echo )
1356
1357module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1358PHONY += $(module-dirs) modules
1359$(module-dirs): crmodverdir $(objtree)/Module.symvers
1360        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1361
1362modules: $(module-dirs)
1363        @echo '  Building modules, stage 2.';
1364        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1365
1366PHONY += modules_install
1367modules_install: _emodinst_ _emodinst_post
1368
1369install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1370PHONY += _emodinst_
1371_emodinst_:
1372        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1373        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1374
1375PHONY += _emodinst_post
1376_emodinst_post: _emodinst_
1377        $(call cmd,depmod)
1378
1379clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1380
1381PHONY += $(clean-dirs) clean
1382$(clean-dirs):
1383        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1384
1385clean:  rm-dirs := $(MODVERDIR)
1386clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1387clean: $(clean-dirs)
1388        $(call cmd,rmdirs)
1389        $(call cmd,rmfiles)
1390        @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1391                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1392                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1393                -type f -print | xargs rm -f
1394
1395help:
1396        @echo  '  Building external modules.'
1397        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1398        @echo  ''
1399        @echo  '  modules         - default target, build the module(s)'
1400        @echo  '  modules_install - install the module'
1401        @echo  '  clean           - remove generated files in module directory only'
1402        @echo  ''
1403
1404# Dummies...
1405PHONY += prepare scripts
1406prepare: ;
1407scripts: ;
1408endif # KBUILD_EXTMOD
1409
1410# Generate tags for editors
1411# ---------------------------------------------------------------------------
1412
1413#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1414#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1415#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1416
1417ifeq ($(src),$(obj))
1418__srctree =
1419else
1420__srctree = $(srctree)/
1421endif
1422
1423ifeq ($(ALLSOURCE_ARCHS),)
1424ifeq ($(ARCH),um)
1425ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1426else
1427ALLINCLUDE_ARCHS := $(SRCARCH)
1428endif
1429else
1430#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1431ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1432endif
1433
1434ALLSOURCE_ARCHS := $(SRCARCH)
1435
1436define find-sources
1437        ( for arch in $(ALLSOURCE_ARCHS) ; do \
1438               find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1439                    -wholename $(__srctree)arch/$${arch}/include/asm -type d -prune \
1440                    -o -name $1 -print; \
1441          done ; \
1442          find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1443               -name $1 -print; \
1444          find $(__srctree)include $(RCS_FIND_IGNORE) \
1445               \( -name config -o -name 'asm-*' \) -prune \
1446               -o -name $1 -print; \
1447          for arch in $(ALLINCLUDE_ARCHS) ; do \
1448               test -e $(__srctree)include/asm-$${arch} && \
1449                 find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1450                    -name $1 -print; \
1451               test -e $(__srctree)arch/$${arch}/include/asm && \
1452                 find $(__srctree)arch/$${arch}/include/asm $(RCS_FIND_IGNORE) \
1453                    -name $1 -print; \
1454          done ; \
1455          find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1456               -name $1 -print; \
1457          find $(__srctree) $(RCS_FIND_IGNORE) \
1458               \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1459               -name $1 -print; \
1460          )
1461endef
1462
1463define all-sources
1464        $(call find-sources,'*.[chS]')
1465endef
1466define all-kconfigs
1467        $(call find-sources,'Kconfig*')
1468endef
1469define all-defconfigs
1470        $(call find-sources,'defconfig')
1471endef
1472
1473define xtags
1474        if $1 --version 2>&1 | grep -iq exuberant; then \
1475            $(all-sources) | xargs $1 -a \
1476                -I __initdata,__exitdata,__acquires,__releases \
1477                -I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
1478                -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1479                --extra=+f --c-kinds=+px \
1480                --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1481            $(all-kconfigs) | xargs $1 -a \
1482                --langdef=kconfig \
1483                --language-force=kconfig \
1484                --regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
1485            $(all-defconfigs) | xargs -r $1 -a \
1486                --langdef=dotconfig \
1487                --language-force=dotconfig \
1488                --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1489        elif $1 --version 2>&1 | grep -iq emacs; then \
1490            $(all-sources) | xargs $1 -a; \
1491            $(all-kconfigs) | xargs $1 -a \
1492                --regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
1493            $(all-defconfigs) | xargs -r $1 -a \
1494                --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1495        else \
1496            $(all-sources) | xargs $1 -a; \
1497        fi
1498endef
1499
1500quiet_cmd_cscope-file = FILELST cscope.files
1501      cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1502
1503quiet_cmd_cscope = MAKE    cscope.out
1504      cmd_cscope = cscope -b -f cscope.out
1505
1506cscope: FORCE
1507        $(call cmd,cscope-file)
1508        $(call cmd,cscope)
1509
1510quiet_cmd_TAGS = MAKE   $@
1511define cmd_TAGS
1512        rm -f $@; \
1513        $(call xtags,etags)
1514endef
1515
1516TAGS: FORCE
1517        $(call cmd,TAGS)
1518
1519quiet_cmd_tags = MAKE   $@
1520define cmd_tags
1521        rm -f $@; \
1522        $(call xtags,ctags)
1523endef
1524
1525tags: FORCE
1526        $(call cmd,tags)
1527
1528
1529# Scripts to check various things for consistency
1530# ---------------------------------------------------------------------------
1531
1532includecheck:
1533        find * $(RCS_FIND_IGNORE) \
1534                -name '*.[hcS]' -type f -print | sort \
1535                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1536
1537versioncheck:
1538        find * $(RCS_FIND_IGNORE) \
1539                -name '*.[hcS]' -type f -print | sort \
1540                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1541
1542namespacecheck:
1543        $(PERL) $(srctree)/scripts/namespace.pl
1544
1545export_report:
1546        $(PERL) $(srctree)/scripts/export_report.pl
1547
1548endif #ifeq ($(config-targets),1)
1549endif #ifeq ($(mixed-targets),1)
1550
1551PHONY += checkstack kernelrelease kernelversion
1552
1553# UML needs a little special treatment here.  It wants to use the host
1554# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1555# else wants $(ARCH), including people doing cross-builds, which means
1556# that $(SUBARCH) doesn't work here.
1557ifeq ($(ARCH), um)
1558CHECKSTACK_ARCH := $(SUBARCH)
1559else
1560CHECKSTACK_ARCH := $(ARCH)
1561endif
1562checkstack:
1563        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1564        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1565
1566kernelrelease:
1567        $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1568        $(error kernelrelease not valid - run 'make prepare' to update it))
1569kernelversion:
1570        @echo $(KERNELVERSION)
1571
1572# Single targets
1573# ---------------------------------------------------------------------------
1574# Single targets are compatible with:
1575# - build with mixed source and output
1576# - build with separate output dir 'make O=...'
1577# - external modules
1578#
1579#  target-dir => where to store outputfile
1580#  build-dir  => directory in kernel source tree to use
1581
1582ifeq ($(KBUILD_EXTMOD),)
1583        build-dir  = $(patsubst %/,%,$(dir $@))
1584        target-dir = $(dir $@)
1585else
1586        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1587        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1588        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1589endif
1590
1591%.s: %.c prepare scripts FORCE
1592        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1593%.i: %.c prepare scripts FORCE
1594        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1595%.o: %.c prepare scripts FORCE
1596        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1597%.lst: %.c prepare scripts FORCE
1598        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1599%.s: %.S prepare scripts FORCE
1600        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1601%.o: %.S prepare scripts FORCE
1602        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1603%.symtypes: %.c prepare scripts FORCE
1604        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1605
1606# Modules
1607/ %/: prepare scripts FORCE
1608        $(cmd_crmodverdir)
1609        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1610        $(build)=$(build-dir)
1611%.ko: prepare scripts FORCE
1612        $(cmd_crmodverdir)
1613        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1614        $(build)=$(build-dir) $(@:.ko=.o)
1615        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1616
1617# FIXME Should go into a make.lib or something 
1618# ===========================================================================
1619
1620quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1621      cmd_rmdirs = rm -rf $(rm-dirs)
1622
1623quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1624      cmd_rmfiles = rm -f $(rm-files)
1625
1626# Run depmod only if we have System.map and depmod is executable
1627quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1628      cmd_depmod = \
1629        if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1630                $(DEPMOD) -ae -F System.map                                     \
1631                $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1632                $(KERNELRELEASE);                                               \
1633        fi
1634
1635# Create temporary dir for module support files
1636# clean it up only when building all modules
1637cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1638                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1639
1640a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1641          $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1642          $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1643
1644quiet_cmd_as_o_S = AS      $@
1645cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1646
1647# read all saved command lines
1648
1649targets := $(wildcard $(sort $(targets)))
1650cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1651
1652ifneq ($(cmd_files),)
1653  $(cmd_files): ;       # Do not try to update included dependency files
1654  include $(cmd_files)
1655endif
1656
1657# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1658# Usage:
1659# $(Q)$(MAKE) $(clean)=dir
1660clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1661
1662endif   # skip-makefile
1663
1664PHONY += FORCE
1665FORCE:
1666
1667# Declare the contents of the .PHONY variable as phony.  We keep that
1668# information in a variable se we can use it in if_changed and friends.
1669.PHONY: $(PHONY)
1670
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.