linux/Makefile
<<
>>
Prefs
   1VERSION = 2
   2PATCHLEVEL = 6
   3SUBLEVEL = 37
   4EXTRAVERSION = .5
   5NAME = Flesh-Eating Bats with Fangs
   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 := $(O)
 103endif
 104
 105# That's our default target when none is given on the command line
 106PHONY := _all
 107_all:
 108
 109# Cancel implicit rules on top Makefile
 110$(CURDIR)/Makefile Makefile: ;
 111
 112ifneq ($(KBUILD_OUTPUT),)
 113# Invoke a second make in the output directory, passing relevant variables
 114# check that the output directory actually exists
 115saved-output := $(KBUILD_OUTPUT)
 116KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 117$(if $(KBUILD_OUTPUT),, \
 118     $(error output directory "$(saved-output)" does not exist))
 119
 120PHONY += $(MAKECMDGOALS) sub-make
 121
 122$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 123        $(Q)@:
 124
 125sub-make: FORCE
 126        $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 127        KBUILD_SRC=$(CURDIR) \
 128        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 129        $(filter-out _all sub-make,$(MAKECMDGOALS))
 130
 131# Leave processing to above invocation of make
 132skip-makefile := 1
 133endif # ifneq ($(KBUILD_OUTPUT),)
 134endif # ifeq ($(KBUILD_SRC),)
 135
 136# We process the rest of the Makefile if this is the final invocation of make
 137ifeq ($(skip-makefile),)
 138
 139# If building an external module we do not care about the all: rule
 140# but instead _all depend on modules
 141PHONY += all
 142ifeq ($(KBUILD_EXTMOD),)
 143_all: all
 144else
 145_all: modules
 146endif
 147
 148srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 149objtree         := $(CURDIR)
 150src             := $(srctree)
 151obj             := $(objtree)
 152
 153VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 154
 155export srctree objtree VPATH
 156
 157
 158# SUBARCH tells the usermode build what the underlying arch is.  That is set
 159# first, and if a usermode build is happening, the "ARCH=um" on the command
 160# line overrides the setting of ARCH below.  If a native build is happening,
 161# then ARCH is assigned, getting whatever value it gets normally, and 
 162# SUBARCH is subsequently ignored.
 163
 164SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 165                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 166                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 167                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 168                                  -e s/sh[234].*/sh/ )
 169
 170# Cross compiling and selecting different set of gcc/bin-utils
 171# ---------------------------------------------------------------------------
 172#
 173# When performing cross compilation for other architectures ARCH shall be set
 174# to the target architecture. (See arch/* for the possibilities).
 175# ARCH can be set during invocation of make:
 176# make ARCH=ia64
 177# Another way is to have ARCH set in the environment.
 178# The default ARCH is the host where make is executed.
 179
 180# CROSS_COMPILE specify the prefix used for all executables used
 181# during compilation. Only gcc and related bin-utils executables
 182# are prefixed with $(CROSS_COMPILE).
 183# CROSS_COMPILE can be set on the command line
 184# make CROSS_COMPILE=ia64-linux-
 185# Alternatively CROSS_COMPILE can be set in the environment.
 186# A third alternative is to store a setting in .config so that plain
 187# "make" in the configured kernel build directory always uses that.
 188# Default value for CROSS_COMPILE is not to prefix executables
 189# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 190export KBUILD_BUILDHOST := $(SUBARCH)
 191ARCH            ?= $(SUBARCH)
 192CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 193
 194# Architecture as present in compile.h
 195UTS_MACHINE     := $(ARCH)
 196SRCARCH         := $(ARCH)
 197
 198# Additional ARCH settings for x86
 199ifeq ($(ARCH),i386)
 200        SRCARCH := x86
 201endif
 202ifeq ($(ARCH),x86_64)
 203        SRCARCH := x86
 204endif
 205
 206# Additional ARCH settings for sparc
 207ifeq ($(ARCH),sparc32)
 208       SRCARCH := sparc
 209endif
 210ifeq ($(ARCH),sparc64)
 211       SRCARCH := sparc
 212endif
 213
 214# Additional ARCH settings for sh
 215ifeq ($(ARCH),sh64)
 216       SRCARCH := sh
 217endif
 218
 219# Where to locate arch specific headers
 220hdr-arch  := $(SRCARCH)
 221
 222ifeq ($(ARCH),m68knommu)
 223       hdr-arch  := m68k
 224endif
 225
 226KCONFIG_CONFIG  ?= .config
 227
 228# SHELL used by kbuild
 229CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 230          else if [ -x /bin/bash ]; then echo /bin/bash; \
 231          else echo sh; fi ; fi)
 232
 233HOSTCC       = gcc
 234HOSTCXX      = g++
 235HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 236HOSTCXXFLAGS = -O2
 237
 238# Decide whether to build built-in, modular, or both.
 239# Normally, just do built-in.
 240
 241KBUILD_MODULES :=
 242KBUILD_BUILTIN := 1
 243
 244#       If we have only "make modules", don't compile built-in objects.
 245#       When we're building modules with modversions, we need to consider
 246#       the built-in objects during the descend as well, in order to
 247#       make sure the checksums are up to date before we record them.
 248
 249ifeq ($(MAKECMDGOALS),modules)
 250  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 251endif
 252
 253#       If we have "make <whatever> modules", compile modules
 254#       in addition to whatever we do anyway.
 255#       Just "make" or "make all" shall build modules as well
 256
 257ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 258  KBUILD_MODULES := 1
 259endif
 260
 261ifeq ($(MAKECMDGOALS),)
 262  KBUILD_MODULES := 1
 263endif
 264
 265export KBUILD_MODULES KBUILD_BUILTIN
 266export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 267
 268# Beautify output
 269# ---------------------------------------------------------------------------
 270#
 271# Normally, we echo the whole command before executing it. By making
 272# that echo $($(quiet)$(cmd)), we now have the possibility to set
 273# $(quiet) to choose other forms of output instead, e.g.
 274#
 275#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 276#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 277#
 278# If $(quiet) is empty, the whole command will be printed.
 279# If it is set to "quiet_", only the short version will be printed. 
 280# If it is set to "silent_", nothing will be printed at all, since
 281# the variable $(silent_cmd_cc_o_c) doesn't exist.
 282#
 283# A simple variant is to prefix commands with $(Q) - that's useful
 284# for commands that shall be hidden in non-verbose mode.
 285#
 286#       $(Q)ln $@ :<
 287#
 288# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 289# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 290
 291ifeq ($(KBUILD_VERBOSE),1)
 292  quiet =
 293  Q =
 294else
 295  quiet=quiet_
 296  Q = @
 297endif
 298
 299# If the user is running make -s (silent mode), suppress echoing of
 300# commands
 301
 302ifneq ($(findstring s,$(MAKEFLAGS)),)
 303  quiet=silent_
 304endif
 305
 306export quiet Q KBUILD_VERBOSE
 307
 308
 309# Look for make include files relative to root of kernel src
 310MAKEFLAGS += --include-dir=$(srctree)
 311
 312# We need some generic definitions (do not try to remake the file).
 313$(srctree)/scripts/Kbuild.include: ;
 314include $(srctree)/scripts/Kbuild.include
 315
 316# Make variables (CC, etc...)
 317
 318AS              = $(CROSS_COMPILE)as
 319LD              = $(CROSS_COMPILE)ld
 320CC              = $(CROSS_COMPILE)gcc
 321CPP             = $(CC) -E
 322AR              = $(CROSS_COMPILE)ar
 323NM              = $(CROSS_COMPILE)nm
 324STRIP           = $(CROSS_COMPILE)strip
 325OBJCOPY         = $(CROSS_COMPILE)objcopy
 326OBJDUMP         = $(CROSS_COMPILE)objdump
 327AWK             = awk
 328GENKSYMS        = scripts/genksyms/genksyms
 329INSTALLKERNEL  := installkernel
 330DEPMOD          = /sbin/depmod
 331KALLSYMS        = scripts/kallsyms
 332PERL            = perl
 333CHECK           = sparse
 334
 335CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 336                  -Wbitwise -Wno-return-void $(CF)
 337CFLAGS_MODULE   =
 338AFLAGS_MODULE   =
 339LDFLAGS_MODULE  =
 340CFLAGS_KERNEL   =
 341AFLAGS_KERNEL   =
 342CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 343
 344
 345# Use LINUXINCLUDE when you must reference the include/ directory.
 346# Needed to be compatible with the O= option
 347LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 348                   $(if $(KBUILD_SRC), -I$(srctree)/include) \
 349                   -include include/generated/autoconf.h
 350
 351KBUILD_CPPFLAGS := -D__KERNEL__
 352
 353KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 354                   -fno-strict-aliasing -fno-common \
 355                   -Werror-implicit-function-declaration \
 356                   -Wno-format-security \
 357                   -fno-delete-null-pointer-checks
 358KBUILD_AFLAGS_KERNEL :=
 359KBUILD_CFLAGS_KERNEL :=
 360KBUILD_AFLAGS   := -D__ASSEMBLY__
 361KBUILD_AFLAGS_MODULE  := -DMODULE
 362KBUILD_CFLAGS_MODULE  := -DMODULE
 363KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 364
 365# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 366KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 367KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 368
 369export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 370export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 371export CPP AR NM STRIP OBJCOPY OBJDUMP
 372export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 373export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 374
 375export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 376export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 377export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 378export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 379export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 380
 381# When compiling out-of-tree modules, put MODVERDIR in the module
 382# tree rather than in the kernel tree. The kernel tree might
 383# even be read-only.
 384export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 385
 386# Files to ignore in find ... statements
 387
 388RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 389export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 390
 391# ===========================================================================
 392# Rules shared between *config targets and build targets
 393
 394# Basic helpers built in scripts/
 395PHONY += scripts_basic
 396scripts_basic:
 397        $(Q)$(MAKE) $(build)=scripts/basic
 398        $(Q)rm -f .tmp_quiet_recordmcount
 399
 400# To avoid any implicit rule to kick in, define an empty command.
 401scripts/basic/%: scripts_basic ;
 402
 403PHONY += outputmakefile
 404# outputmakefile generates a Makefile in the output directory, if using a
 405# separate output directory. This allows convenient use of make in the
 406# output directory.
 407outputmakefile:
 408ifneq ($(KBUILD_SRC),)
 409        $(Q)ln -fsn $(srctree) source
 410        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 411            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 412endif
 413
 414# To make sure we do not include .config for any of the *config targets
 415# catch them early, and hand them over to scripts/kconfig/Makefile
 416# It is allowed to specify more targets when calling make, including
 417# mixing *config targets and build targets.
 418# For example 'make oldconfig all'.
 419# Detect when mixed targets is specified, and make a second invocation
 420# of make so .config is not included in this case either (for *config).
 421
 422no-dot-config-targets := clean mrproper distclean \
 423                         cscope TAGS tags help %docs check% coccicheck \
 424                         include/linux/version.h headers_% \
 425                         kernelversion %src-pkg
 426
 427config-targets := 0
 428mixed-targets  := 0
 429dot-config     := 1
 430
 431ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 432        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 433                dot-config := 0
 434        endif
 435endif
 436
 437ifeq ($(KBUILD_EXTMOD),)
 438        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 439                config-targets := 1
 440                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 441                        mixed-targets := 1
 442                endif
 443        endif
 444endif
 445
 446ifeq ($(mixed-targets),1)
 447# ===========================================================================
 448# We're called with mixed targets (*config and build targets).
 449# Handle them one by one.
 450
 451%:: FORCE
 452        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 453
 454else
 455ifeq ($(config-targets),1)
 456# ===========================================================================
 457# *config targets only - make sure prerequisites are updated, and descend
 458# in scripts/kconfig to make the *config target
 459
 460# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 461# KBUILD_DEFCONFIG may point out an alternative default configuration
 462# used for 'make defconfig'
 463include $(srctree)/arch/$(SRCARCH)/Makefile
 464export KBUILD_DEFCONFIG KBUILD_KCONFIG
 465
 466config: scripts_basic outputmakefile FORCE
 467        $(Q)mkdir -p include/linux include/config
 468        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 469
 470%config: scripts_basic outputmakefile FORCE
 471        $(Q)mkdir -p include/linux include/config
 472        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 473
 474else
 475# ===========================================================================
 476# Build targets only - this includes vmlinux, arch specific targets, clean
 477# targets and others. In general all targets except *config targets.
 478
 479ifeq ($(KBUILD_EXTMOD),)
 480# Additional helpers built in scripts/
 481# Carefully list dependencies so we do not try to build scripts twice
 482# in parallel
 483PHONY += scripts
 484scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 485        $(Q)$(MAKE) $(build)=$(@)
 486
 487# Objects we will link into vmlinux / subdirs we need to visit
 488init-y          := init/
 489drivers-y       := drivers/ sound/ firmware/
 490net-y           := net/
 491libs-y          := lib/
 492core-y          := usr/
 493endif # KBUILD_EXTMOD
 494
 495ifeq ($(dot-config),1)
 496# Read in config
 497-include include/config/auto.conf
 498
 499ifeq ($(KBUILD_EXTMOD),)
 500# Read in dependencies to all Kconfig* files, make sure to run
 501# oldconfig if changes are detected.
 502-include include/config/auto.conf.cmd
 503
 504# To avoid any implicit rule to kick in, define an empty command
 505$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 506
 507# If .config is newer than include/config/auto.conf, someone tinkered
 508# with it and forgot to run make oldconfig.
 509# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 510# we execute the config step to be sure to catch updated Kconfig files
 511include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 512        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 513else
 514# external modules needs include/generated/autoconf.h and include/config/auto.conf
 515# but do not care if they are up-to-date. Use auto.conf to trigger the test
 516PHONY += include/config/auto.conf
 517
 518include/config/auto.conf:
 519        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 520        echo;                                                           \
 521        echo "  ERROR: Kernel configuration is invalid.";               \
 522        echo "         include/generated/autoconf.h or $@ are missing.";\
 523        echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 524        echo;                                                           \
 525        /bin/false)
 526
 527endif # KBUILD_EXTMOD
 528
 529else
 530# Dummy target needed, because used as prerequisite
 531include/config/auto.conf: ;
 532endif # $(dot-config)
 533
 534# The all: target is the default when no target is given on the
 535# command line.
 536# This allow a user to issue only 'make' to build a kernel including modules
 537# Defaults to vmlinux, but the arch makefile usually adds further targets
 538all: vmlinux
 539
 540ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 541KBUILD_CFLAGS   += -Os
 542else
 543KBUILD_CFLAGS   += -O2
 544endif
 545
 546include $(srctree)/arch/$(SRCARCH)/Makefile
 547
 548ifneq ($(CONFIG_FRAME_WARN),0)
 549KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 550endif
 551
 552# Force gcc to behave correct even for buggy distributions
 553ifndef CONFIG_CC_STACKPROTECTOR
 554KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 555endif
 556
 557ifdef CONFIG_FRAME_POINTER
 558KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 559else
 560# Some targets (ARM with Thumb2, for example), can't be built with frame
 561# pointers.  For those, we don't have FUNCTION_TRACER automatically
 562# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 563# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 564# -fomit-frame-pointer with FUNCTION_TRACER.
 565ifndef CONFIG_FUNCTION_TRACER
 566KBUILD_CFLAGS   += -fomit-frame-pointer
 567endif
 568endif
 569
 570ifdef CONFIG_DEBUG_INFO
 571KBUILD_CFLAGS   += -g
 572KBUILD_AFLAGS   += -gdwarf-2
 573endif
 574
 575ifdef CONFIG_DEBUG_INFO_REDUCED
 576KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 577endif
 578
 579ifdef CONFIG_FUNCTION_TRACER
 580KBUILD_CFLAGS   += -pg
 581ifdef CONFIG_DYNAMIC_FTRACE
 582        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 583                BUILD_C_RECORDMCOUNT := y
 584                export BUILD_C_RECORDMCOUNT
 585        endif
 586endif
 587endif
 588
 589# We trigger additional mismatches with less inlining
 590ifdef CONFIG_DEBUG_SECTION_MISMATCH
 591KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 592endif
 593
 594# arch Makefile may override CC so keep this after arch Makefile is included
 595NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 596CHECKFLAGS     += $(NOSTDINC_FLAGS)
 597
 598# warn about C99 declaration after statement
 599KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 600
 601# disable pointer signed / unsigned warnings in gcc 4.0
 602KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 603
 604# disable invalid "can't wrap" optimizations for signed / pointers
 605KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 606
 607# conserve stack if available
 608KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 609
 610# check for 'asm goto'
 611ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 612        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 613endif
 614
 615# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 616# But warn user when we do so
 617warn-assign = \
 618$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 619
 620ifneq ($(KCPPFLAGS),)
 621        $(call warn-assign,CPPFLAGS)
 622        KBUILD_CPPFLAGS += $(KCPPFLAGS)
 623endif
 624ifneq ($(KAFLAGS),)
 625        $(call warn-assign,AFLAGS)
 626        KBUILD_AFLAGS += $(KAFLAGS)
 627endif
 628ifneq ($(KCFLAGS),)
 629        $(call warn-assign,CFLAGS)
 630        KBUILD_CFLAGS += $(KCFLAGS)
 631endif
 632
 633# Use --build-id when available.
 634LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 635                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 636KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 637LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 638
 639ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 640LDFLAGS_vmlinux += $(call ld-option, -X,)
 641endif
 642
 643# Default kernel image to build when no specific target is given.
 644# KBUILD_IMAGE may be overruled on the command line or
 645# set in the environment
 646# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 647# this default value
 648export KBUILD_IMAGE ?= vmlinux
 649
 650#
 651# INSTALL_PATH specifies where to place the updated kernel and system map
 652# images. Default is /boot, but you can set it to other values
 653export  INSTALL_PATH ?= /boot
 654
 655#
 656# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 657# relocations required by build roots.  This is not defined in the
 658# makefile but the argument can be passed to make if needed.
 659#
 660
 661MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 662export MODLIB
 663
 664#
 665#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 666#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 667#  the default option --strip-debug will be used.  Otherwise,
 668#  INSTALL_MOD_STRIP will used as the options to the strip command.
 669
 670ifdef INSTALL_MOD_STRIP
 671ifeq ($(INSTALL_MOD_STRIP),1)
 672mod_strip_cmd = $(STRIP) --strip-debug
 673else
 674mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 675endif # INSTALL_MOD_STRIP=1
 676else
 677mod_strip_cmd = true
 678endif # INSTALL_MOD_STRIP
 679export mod_strip_cmd
 680
 681
 682ifeq ($(KBUILD_EXTMOD),)
 683core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 684
 685vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 686                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 687                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 688
 689vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 690                     $(init-n) $(init-) \
 691                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 692                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 693
 694init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 695core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 696drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 697net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 698libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 699libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 700libs-y          := $(libs-y1) $(libs-y2)
 701
 702# Build vmlinux
 703# ---------------------------------------------------------------------------
 704# vmlinux is built from the objects selected by $(vmlinux-init) and
 705# $(vmlinux-main). Most are built-in.o files from top-level directories
 706# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 707# Ordering when linking is important, and $(vmlinux-init) must be first.
 708#
 709# vmlinux
 710#   ^
 711#   |
 712#   +-< $(vmlinux-init)
 713#   |   +--< init/version.o + more
 714#   |
 715#   +--< $(vmlinux-main)
 716#   |    +--< driver/built-in.o mm/built-in.o + more
 717#   |
 718#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 719#
 720# vmlinux version (uname -v) cannot be updated during normal
 721# descending-into-subdirs phase since we do not yet know if we need to
 722# update vmlinux.
 723# Therefore this step is delayed until just before final link of vmlinux -
 724# except in the kallsyms case where it is done just before adding the
 725# symbols to the kernel.
 726#
 727# System.map is generated to document addresses of all kernel symbols
 728
 729vmlinux-init := $(head-y) $(init-y)
 730vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 731vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 732vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 733export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 734
 735# Rule to link vmlinux - also used during CONFIG_KALLSYMS
 736# May be overridden by arch/$(ARCH)/Makefile
 737quiet_cmd_vmlinux__ ?= LD      $@
 738      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 739      -T $(vmlinux-lds) $(vmlinux-init)                          \
 740      --start-group $(vmlinux-main) --end-group                  \
 741      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 742
 743# Generate new vmlinux version
 744quiet_cmd_vmlinux_version = GEN     .version
 745      cmd_vmlinux_version = set -e;                     \
 746        if [ ! -r .version ]; then                      \
 747          rm -f .version;                               \
 748          echo 1 >.version;                             \
 749        else                                            \
 750          mv .version .old_version;                     \
 751          expr 0$$(cat .old_version) + 1 >.version;     \
 752        fi;                                             \
 753        $(MAKE) $(build)=init
 754
 755# Generate System.map
 756quiet_cmd_sysmap = SYSMAP
 757      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 758
 759# Link of vmlinux
 760# If CONFIG_KALLSYMS is set .version is already updated
 761# Generate System.map and verify that the content is consistent
 762# Use + in front of the vmlinux_version rule to silent warning with make -j2
 763# First command is ':' to allow us to use + in front of the rule
 764define rule_vmlinux__
 765        :
 766        $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 767
 768        $(call cmd,vmlinux__)
 769        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 770
 771        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 772          echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 773        $(cmd_sysmap) $@ System.map;                                         \
 774        if [ $$? -ne 0 ]; then                                               \
 775                rm -f $@;                                                    \
 776                /bin/false;                                                  \
 777        fi;
 778        $(verify_kallsyms)
 779endef
 780
 781
 782ifdef CONFIG_KALLSYMS
 783# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 784# It's a three stage process:
 785# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 786#   empty
 787#   Running kallsyms on that gives us .tmp_kallsyms1.o with
 788#   the right size - vmlinux version (uname -v) is updated during this step
 789# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 790#   but due to the added section, some addresses have shifted.
 791#   From here, we generate a correct .tmp_kallsyms2.o
 792# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 793# o Verify that the System.map from vmlinux matches the map from
 794#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 795# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 796#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 797#   temporary bypass to allow the kernel to be built while the
 798#   maintainers work out what went wrong with kallsyms.
 799
 800ifdef CONFIG_KALLSYMS_EXTRA_PASS
 801last_kallsyms := 3
 802else
 803last_kallsyms := 2
 804endif
 805
 806kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 807
 808define verify_kallsyms
 809        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 810          echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 811          $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 812        $(Q)cmp -s System.map .tmp_System.map ||                             \
 813                (echo Inconsistent kallsyms data;                            \
 814                 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 815                 rm .tmp_kallsyms* ; /bin/false )
 816endef
 817
 818# Update vmlinux version before link
 819# Use + in front of this rule to silent warning about make -j1
 820# First command is ':' to allow us to use + in front of this rule
 821cmd_ksym_ld = $(cmd_vmlinux__)
 822define rule_ksym_ld
 823        : 
 824        +$(call cmd,vmlinux_version)
 825        $(call cmd,vmlinux__)
 826        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 827endef
 828
 829# Generate .S file with all kernel symbols
 830quiet_cmd_kallsyms = KSYM    $@
 831      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 832                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 833
 834.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 835        $(call if_changed_dep,as_o_S)
 836
 837.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 838        $(call cmd,kallsyms)
 839
 840# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 841.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 842        $(call if_changed_rule,ksym_ld)
 843
 844.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 845        $(call if_changed,vmlinux__)
 846
 847.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 848        $(call if_changed,vmlinux__)
 849
 850# Needs to visit scripts/ before $(KALLSYMS) can be used.
 851$(KALLSYMS): scripts ;
 852
 853# Generate some data for debugging strange kallsyms problems
 854debug_kallsyms: .tmp_map$(last_kallsyms)
 855
 856.tmp_map%: .tmp_vmlinux% FORCE
 857        ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 858
 859.tmp_map3: .tmp_map2
 860
 861.tmp_map2: .tmp_map1
 862
 863endif # ifdef CONFIG_KALLSYMS
 864
 865# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 866# relevant sections renamed as per the linker script.
 867quiet_cmd_vmlinux-modpost = LD      $@
 868      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 869         $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 870         $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 871define rule_vmlinux-modpost
 872        :
 873        +$(call cmd,vmlinux-modpost)
 874        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 875        $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 876endef
 877
 878# vmlinux image - including updated kernel symbols
 879vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 880ifdef CONFIG_HEADERS_CHECK
 881        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 882endif
 883ifdef CONFIG_SAMPLES
 884        $(Q)$(MAKE) $(build)=samples
 885endif
 886ifdef CONFIG_BUILD_DOCSRC
 887        $(Q)$(MAKE) $(build)=Documentation
 888endif
 889        $(call vmlinux-modpost)
 890        $(call if_changed_rule,vmlinux__)
 891        $(Q)rm -f .old_version
 892
 893# build vmlinux.o first to catch section mismatch errors early
 894ifdef CONFIG_KALLSYMS
 895.tmp_vmlinux1: vmlinux.o
 896endif
 897
 898modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 899vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 900        $(call if_changed_rule,vmlinux-modpost)
 901
 902# The actual objects are generated when descending, 
 903# make sure no implicit rule kicks in
 904$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 905
 906# Handle descending into subdirectories listed in $(vmlinux-dirs)
 907# Preset locale variables to speed up the build process. Limit locale
 908# tweaks to this spot to avoid wrong language settings when running
 909# make menuconfig etc.
 910# Error messages still appears in the original language
 911
 912PHONY += $(vmlinux-dirs)
 913$(vmlinux-dirs): prepare scripts
 914        $(Q)$(MAKE) $(build)=$@
 915
 916# Store (new) KERNELRELASE string in include/config/kernel.release
 917include/config/kernel.release: include/config/auto.conf FORCE
 918        $(Q)rm -f $@
 919        $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 920
 921
 922# Things we need to do before we recursively start building the kernel
 923# or the modules are listed in "prepare".
 924# A multi level approach is used. prepareN is processed before prepareN-1.
 925# archprepare is used in arch Makefiles and when processed asm symlink,
 926# version.h and scripts_basic is processed / created.
 927
 928# Listed in dependency order
 929PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 930
 931# prepare3 is used to check if we are building in a separate output directory,
 932# and if so do:
 933# 1) Check that make has not been executed in the kernel src $(srctree)
 934prepare3: include/config/kernel.release
 935ifneq ($(KBUILD_SRC),)
 936        @$(kecho) '  Using $(srctree) as source for kernel'
 937        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 938                echo "  $(srctree) is not clean, please run 'make mrproper'";\
 939                echo "  in the '$(srctree)' directory.";\
 940                /bin/false; \
 941        fi;
 942endif
 943
 944# prepare2 creates a makefile if using a separate output directory
 945prepare2: prepare3 outputmakefile
 946
 947prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 948                   include/config/auto.conf
 949        $(cmd_crmodverdir)
 950
 951archprepare: prepare1 scripts_basic
 952
 953prepare0: archprepare FORCE
 954        $(Q)$(MAKE) $(build)=.
 955        $(Q)$(MAKE) $(build)=. missing-syscalls
 956
 957# All the preparing..
 958prepare: prepare0
 959
 960# Generate some files
 961# ---------------------------------------------------------------------------
 962
 963# KERNELRELEASE can change from a few different places, meaning version.h
 964# needs to be updated, so this check is forced on all builds
 965
 966uts_len := 64
 967define filechk_utsrelease.h
 968        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 969          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 970          exit 1;                                                         \
 971        fi;                                                               \
 972        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 973endef
 974
 975define filechk_version.h
 976        (echo \#define LINUX_VERSION_CODE $(shell                             \
 977        expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 978        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 979endef
 980
 981include/linux/version.h: $(srctree)/Makefile FORCE
 982        $(call filechk,version.h)
 983
 984include/generated/utsrelease.h: include/config/kernel.release FORCE
 985        $(call filechk,utsrelease.h)
 986
 987PHONY += headerdep
 988headerdep:
 989        $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
 990
 991# ---------------------------------------------------------------------------
 992
 993PHONY += depend dep
 994depend dep:
 995        @echo '*** Warning: make $@ is unnecessary now.'
 996
 997# ---------------------------------------------------------------------------
 998# Firmware install
 999INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1000export INSTALL_FW_PATH
1001
1002PHONY += firmware_install
1003firmware_install: FORCE
1004        @mkdir -p $(objtree)/firmware
1005        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1006
1007# ---------------------------------------------------------------------------
1008# Kernel headers
1009
1010#Default location for installed headers
1011export INSTALL_HDR_PATH = $(objtree)/usr
1012
1013hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1014
1015# If we do an all arch process set dst to asm-$(hdr-arch)
1016hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1017
1018PHONY += __headers
1019__headers: include/linux/version.h scripts_basic FORCE
1020        $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1021
1022PHONY += headers_install_all
1023headers_install_all:
1024        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1025
1026PHONY += headers_install
1027headers_install: __headers
1028        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1029        $(error Headers not exportable for the $(SRCARCH) architecture))
1030        $(Q)$(MAKE) $(hdr-inst)=include
1031        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1032
1033PHONY += headers_check_all
1034headers_check_all: headers_install_all
1035        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1036
1037PHONY += headers_check
1038headers_check: headers_install
1039        $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1040        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1041
1042# ---------------------------------------------------------------------------
1043# Modules
1044
1045ifdef CONFIG_MODULES
1046
1047# By default, build modules as well
1048
1049all: modules
1050
1051#       Build modules
1052#
1053#       A module can be listed more than once in obj-m resulting in
1054#       duplicate lines in modules.order files.  Those are removed
1055#       using awk while concatenating to the final file.
1056
1057PHONY += modules
1058modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1059        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1060        @$(kecho) '  Building modules, stage 2.';
1061        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1062        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1063
1064modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1065        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1066
1067%/modules.builtin: include/config/auto.conf
1068        $(Q)$(MAKE) $(modbuiltin)=$*
1069
1070
1071# Target to prepare building external modules
1072PHONY += modules_prepare
1073modules_prepare: prepare scripts
1074
1075# Target to install modules
1076PHONY += modules_install
1077modules_install: _modinst_ _modinst_post
1078
1079PHONY += _modinst_
1080_modinst_:
1081        @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1082                echo "Warning: you may need to install module-init-tools"; \
1083                echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1084                sleep 1; \
1085        fi
1086        @rm -rf $(MODLIB)/kernel
1087        @rm -f $(MODLIB)/source
1088        @mkdir -p $(MODLIB)/kernel
1089        @ln -s $(srctree) $(MODLIB)/source
1090        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1091                rm -f $(MODLIB)/build ; \
1092                ln -s $(objtree) $(MODLIB)/build ; \
1093        fi
1094        @cp -f $(objtree)/modules.order $(MODLIB)/
1095        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1096        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1097
1098# This depmod is only for convenience to give the initial
1099# boot a modules.dep even before / is mounted read-write.  However the
1100# boot script depmod is the master version.
1101PHONY += _modinst_post
1102_modinst_post: _modinst_
1103        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1104        $(call cmd,depmod)
1105
1106else # CONFIG_MODULES
1107
1108# Modules not configured
1109# ---------------------------------------------------------------------------
1110
1111modules modules_install: FORCE
1112        @echo
1113        @echo "The present kernel configuration has modules disabled."
1114        @echo "Type 'make config' and enable loadable module support."
1115        @echo "Then build a kernel with module support enabled."
1116        @echo
1117        @exit 1
1118
1119endif # CONFIG_MODULES
1120
1121###
1122# Cleaning is done on three levels.
1123# make clean     Delete most generated files
1124#                Leave enough to build external modules
1125# make mrproper  Delete the current configuration, and all generated files
1126# make distclean Remove editor backup files, patch leftover files and the like
1127
1128# Directories & files removed with 'make clean'
1129CLEAN_DIRS  += $(MODVERDIR)
1130CLEAN_FILES +=  vmlinux System.map \
1131                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1132
1133# Directories & files removed with 'make mrproper'
1134MRPROPER_DIRS  += include/config usr/include include/generated
1135MRPROPER_FILES += .config .config.old .version .old_version             \
1136                  include/linux/version.h                               \
1137                  Module.symvers tags TAGS cscope*
1138
1139# clean - Delete most, but leave enough to build external modules
1140#
1141clean: rm-dirs  := $(CLEAN_DIRS)
1142clean: rm-files := $(CLEAN_FILES)
1143clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1144
1145PHONY += $(clean-dirs) clean archclean
1146$(clean-dirs):
1147        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1148
1149clean: archclean
1150
1151# mrproper - Delete all generated files, including .config
1152#
1153mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1154mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1155mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1156
1157PHONY += $(mrproper-dirs) mrproper archmrproper
1158$(mrproper-dirs):
1159        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1160
1161mrproper: clean archmrproper $(mrproper-dirs)
1162        $(call cmd,rmdirs)
1163        $(call cmd,rmfiles)
1164
1165# distclean
1166#
1167PHONY += distclean
1168
1169distclean: mrproper
1170        @find $(srctree) $(RCS_FIND_IGNORE) \
1171                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1172                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1173                -o -name '.*.rej' -o -size 0 \
1174                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1175                -type f -print | xargs rm -f
1176
1177
1178# Packaging of the kernel to various formats
1179# ---------------------------------------------------------------------------
1180# rpm target kept for backward compatibility
1181package-dir     := $(srctree)/scripts/package
1182
1183%src-pkg: FORCE
1184        $(Q)$(MAKE) $(build)=$(package-dir) $@
1185%pkg: include/config/kernel.release FORCE
1186        $(Q)$(MAKE) $(build)=$(package-dir) $@
1187rpm: include/config/kernel.release FORCE
1188        $(Q)$(MAKE) $(build)=$(package-dir) $@
1189
1190
1191# Brief documentation of the typical targets used
1192# ---------------------------------------------------------------------------
1193
1194boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1195boards := $(notdir $(boards))
1196board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1197board-dirs := $(sort $(notdir $(board-dirs:/=)))
1198
1199help:
1200        @echo  'Cleaning targets:'
1201        @echo  '  clean           - Remove most generated files but keep the config and'
1202        @echo  '                    enough build support to build external modules'
1203        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1204        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1205        @echo  ''
1206        @echo  'Configuration targets:'
1207        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1208        @echo  ''
1209        @echo  'Other generic targets:'
1210        @echo  '  all             - Build all targets marked with [*]'
1211        @echo  '* vmlinux         - Build the bare kernel'
1212        @echo  '* modules         - Build all modules'
1213        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1214        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1215        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1216        @echo  '  dir/            - Build all files in dir and below'
1217        @echo  '  dir/file.[oisS] - Build specified target only'
1218        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1219        @echo  '                    (requires a recent binutils and recent build (System.map))'
1220        @echo  '  dir/file.ko     - Build module including final link'
1221        @echo  '  modules_prepare - Set up for building external modules'
1222        @echo  '  tags/TAGS       - Generate tags file for editors'
1223        @echo  '  cscope          - Generate cscope index'
1224        @echo  '  kernelrelease   - Output the release version string'
1225        @echo  '  kernelversion   - Output the version stored in Makefile'
1226        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1227         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1228         echo  ''
1229        @echo  'Static analysers'
1230        @echo  '  checkstack      - Generate a list of stack hogs'
1231        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1232        @echo  '  versioncheck    - Sanity check on version.h usage'
1233        @echo  '  includecheck    - Check for duplicate included header files'
1234        @echo  '  export_report   - List the usages of all exported symbols'
1235        @echo  '  headers_check   - Sanity check on exported headers'
1236        @echo  '  headerdep       - Detect inclusion cycles in headers'
1237        @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1238        @echo  ''
1239        @echo  'Kernel packaging:'
1240        @$(MAKE) $(build)=$(package-dir) help
1241        @echo  ''
1242        @echo  'Documentation targets:'
1243        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1244        @echo  ''
1245        @echo  'Architecture specific targets ($(SRCARCH)):'
1246        @$(if $(archhelp),$(archhelp),\
1247                echo '  No architecture specific help defined for $(SRCARCH)')
1248        @echo  ''
1249        @$(if $(boards), \
1250                $(foreach b, $(boards), \
1251                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1252                echo '')
1253        @$(if $(board-dirs), \
1254                $(foreach b, $(board-dirs), \
1255                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1256                printf "  %-16s - Show all of the above\\n" help-boards; \
1257                echo '')
1258
1259        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1260        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1261        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1262        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1263        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1264        @echo  ''
1265        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1266        @echo  'For further info see the ./README file'
1267
1268
1269help-board-dirs := $(addprefix help-,$(board-dirs))
1270
1271help-boards: $(help-board-dirs)
1272
1273boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1274
1275$(help-board-dirs): help-%:
1276        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1277        @$(if $(boards-per-dir), \
1278                $(foreach b, $(boards-per-dir), \
1279                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1280                echo '')
1281
1282
1283# Documentation targets
1284# ---------------------------------------------------------------------------
1285%docs: scripts_basic FORCE
1286        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1287
1288else # KBUILD_EXTMOD
1289
1290###
1291# External module support.
1292# When building external modules the kernel used as basis is considered
1293# read-only, and no consistency checks are made and the make
1294# system is not used on the basis kernel. If updates are required
1295# in the basis kernel ordinary make commands (without M=...) must
1296# be used.
1297#
1298# The following are the only valid targets when building external
1299# modules.
1300# make M=dir clean     Delete all automatically generated files
1301# make M=dir modules   Make all modules in specified dir
1302# make M=dir           Same as 'make M=dir modules'
1303# make M=dir modules_install
1304#                      Install the modules built in the module directory
1305#                      Assumes install directory is already created
1306
1307# We are always building modules
1308KBUILD_MODULES := 1
1309PHONY += crmodverdir
1310crmodverdir:
1311        $(cmd_crmodverdir)
1312
1313PHONY += $(objtree)/Module.symvers
1314$(objtree)/Module.symvers:
1315        @test -e $(objtree)/Module.symvers || ( \
1316        echo; \
1317        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1318        echo "           is missing; modules will have no dependencies and modversions."; \
1319        echo )
1320
1321module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1322PHONY += $(module-dirs) modules
1323$(module-dirs): crmodverdir $(objtree)/Module.symvers
1324        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1325
1326modules: $(module-dirs)
1327        @$(kecho) '  Building modules, stage 2.';
1328        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1329
1330PHONY += modules_install
1331modules_install: _emodinst_ _emodinst_post
1332
1333install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1334PHONY += _emodinst_
1335_emodinst_:
1336        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1337        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1338
1339PHONY += _emodinst_post
1340_emodinst_post: _emodinst_
1341        $(call cmd,depmod)
1342
1343clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1344
1345PHONY += $(clean-dirs) clean
1346$(clean-dirs):
1347        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1348
1349clean:  rm-dirs := $(MODVERDIR)
1350clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1351
1352help:
1353        @echo  '  Building external modules.'
1354        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1355        @echo  ''
1356        @echo  '  modules         - default target, build the module(s)'
1357        @echo  '  modules_install - install the module'
1358        @echo  '  clean           - remove generated files in module directory only'
1359        @echo  ''
1360
1361# Dummies...
1362PHONY += prepare scripts
1363prepare: ;
1364scripts: ;
1365endif # KBUILD_EXTMOD
1366
1367clean: $(clean-dirs)
1368        $(call cmd,rmdirs)
1369        $(call cmd,rmfiles)
1370        @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1371                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1372                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1373                -o -name '*.symtypes' -o -name 'modules.order' \
1374                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1375                -o -name '*.gcno' \) -type f -print | xargs rm -f
1376
1377# Generate tags for editors
1378# ---------------------------------------------------------------------------
1379quiet_cmd_tags = GEN     $@
1380      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1381
1382tags TAGS cscope: FORCE
1383        $(call cmd,tags)
1384
1385# Scripts to check various things for consistency
1386# ---------------------------------------------------------------------------
1387
1388includecheck:
1389        find * $(RCS_FIND_IGNORE) \
1390                -name '*.[hcS]' -type f -print | sort \
1391                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1392
1393versioncheck:
1394        find * $(RCS_FIND_IGNORE) \
1395                -name '*.[hcS]' -type f -print | sort \
1396                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1397
1398coccicheck:
1399        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1400
1401namespacecheck:
1402        $(PERL) $(srctree)/scripts/namespace.pl
1403
1404export_report:
1405        $(PERL) $(srctree)/scripts/export_report.pl
1406
1407endif #ifeq ($(config-targets),1)
1408endif #ifeq ($(mixed-targets),1)
1409
1410PHONY += checkstack kernelrelease kernelversion
1411
1412# UML needs a little special treatment here.  It wants to use the host
1413# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1414# else wants $(ARCH), including people doing cross-builds, which means
1415# that $(SUBARCH) doesn't work here.
1416ifeq ($(ARCH), um)
1417CHECKSTACK_ARCH := $(SUBARCH)
1418else
1419CHECKSTACK_ARCH := $(ARCH)
1420endif
1421checkstack:
1422        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1423        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1424
1425kernelrelease:
1426        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1427
1428kernelversion:
1429        @echo $(KERNELVERSION)
1430
1431# Single targets
1432# ---------------------------------------------------------------------------
1433# Single targets are compatible with:
1434# - build with mixed source and output
1435# - build with separate output dir 'make O=...'
1436# - external modules
1437#
1438#  target-dir => where to store outputfile
1439#  build-dir  => directory in kernel source tree to use
1440
1441ifeq ($(KBUILD_EXTMOD),)
1442        build-dir  = $(patsubst %/,%,$(dir $@))
1443        target-dir = $(dir $@)
1444else
1445        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1446        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1447        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1448endif
1449
1450%.s: %.c prepare scripts FORCE
1451        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1452%.i: %.c prepare scripts FORCE
1453        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1454%.o: %.c prepare scripts FORCE
1455        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1456%.lst: %.c prepare scripts FORCE
1457        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1458%.s: %.S prepare scripts FORCE
1459        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1460%.o: %.S prepare scripts FORCE
1461        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1462%.symtypes: %.c prepare scripts FORCE
1463        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1464
1465# Modules
1466/: prepare scripts FORCE
1467        $(cmd_crmodverdir)
1468        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1469        $(build)=$(build-dir)
1470%/: prepare scripts FORCE
1471        $(cmd_crmodverdir)
1472        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1473        $(build)=$(build-dir)
1474%.ko: prepare scripts FORCE
1475        $(cmd_crmodverdir)
1476        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1477        $(build)=$(build-dir) $(@:.ko=.o)
1478        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1479
1480# FIXME Should go into a make.lib or something 
1481# ===========================================================================
1482
1483quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1484      cmd_rmdirs = rm -rf $(rm-dirs)
1485
1486quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1487      cmd_rmfiles = rm -f $(rm-files)
1488
1489# Run depmod only if we have System.map and depmod is executable
1490quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1491      cmd_depmod = \
1492        if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1493                $(DEPMOD) -ae -F System.map                                     \
1494                $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1495                $(KERNELRELEASE);                                               \
1496        fi
1497
1498# Create temporary dir for module support files
1499# clean it up only when building all modules
1500cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1501                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1502
1503a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1504          $(KBUILD_AFLAGS_KERNEL)                              \
1505          $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1506          $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1507
1508quiet_cmd_as_o_S = AS      $@
1509cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1510
1511# read all saved command lines
1512
1513targets := $(wildcard $(sort $(targets)))
1514cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1515
1516ifneq ($(cmd_files),)
1517  $(cmd_files): ;       # Do not try to update included dependency files
1518  include $(cmd_files)
1519endif
1520
1521# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1522# Usage:
1523# $(Q)$(MAKE) $(clean)=dir
1524clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1525
1526endif   # skip-makefile
1527
1528PHONY += FORCE
1529FORCE:
1530
1531# Declare the contents of the .PHONY variable as phony.  We keep that
1532# information in a variable so we can use it in if_changed and friends.
1533.PHONY: $(PHONY)
1534