linux/Makefile
<<
>>
Prefs
   1VERSION = 3
   2PATCHLEVEL = 1
   3SUBLEVEL = 6
   4EXTRAVERSION =
   5NAME = "Divemaster Edition"
   6
   7# *DOCUMENTATION*
   8# To see a list of typical targets execute "make help"
   9# More info can be located in ./README
  10# Comments in this file are targeted only to the developer, do not
  11# expect to learn how to build the kernel reading this file.
  12
  13# Do not:
  14# o  use make's built-in rules and variables
  15#    (this increases performance and avoids hard-to-debug behaviour);
  16# o  print "Entering directory ...";
  17MAKEFLAGS += -rR --no-print-directory
  18
  19# Avoid funny character set dependencies
  20unexport LC_ALL
  21LC_COLLATE=C
  22LC_NUMERIC=C
  23export LC_COLLATE LC_NUMERIC
  24
  25# We are using a recursive build, so we need to do a little thinking
  26# to get the ordering right.
  27#
  28# Most importantly: sub-Makefiles should only ever modify files in
  29# their own directory. If in some directory we have a dependency on
  30# a file in another dir (which doesn't happen often, but it's often
  31# unavoidable when linking the built-in.o targets which finally
  32# turn into vmlinux), we will call a sub make in that other dir, and
  33# after that we are sure that everything which is in that other dir
  34# is now up to date.
  35#
  36# The only cases where we need to modify files which have global
  37# effects are thus separated out and done before the recursive
  38# descending is started. They are now explicitly listed as the
  39# prepare rule.
  40
  41# To put more focus on warnings, be less verbose as default
  42# Use 'make V=1' to see the full commands
  43
  44ifeq ("$(origin V)", "command line")
  45  KBUILD_VERBOSE = $(V)
  46endif
  47ifndef KBUILD_VERBOSE
  48  KBUILD_VERBOSE = 0
  49endif
  50
  51# Call a source code checker (by default, "sparse") as part of the
  52# C compilation.
  53#
  54# Use 'make C=1' to enable checking of only re-compiled files.
  55# Use 'make C=2' to enable checking of *all* source files, regardless
  56# of whether they are re-compiled or not.
  57#
  58# See the file "Documentation/sparse.txt" for more details, including
  59# where to get the "sparse" utility.
  60
  61ifeq ("$(origin C)", "command line")
  62  KBUILD_CHECKSRC = $(C)
  63endif
  64ifndef KBUILD_CHECKSRC
  65  KBUILD_CHECKSRC = 0
  66endif
  67
  68# Use make M=dir to specify directory of external module to build
  69# Old syntax make ... SUBDIRS=$PWD is still supported
  70# Setting the environment variable KBUILD_EXTMOD take precedence
  71ifdef SUBDIRS
  72  KBUILD_EXTMOD ?= $(SUBDIRS)
  73endif
  74
  75ifeq ("$(origin M)", "command line")
  76  KBUILD_EXTMOD := $(M)
  77endif
  78
  79# kbuild supports saving output files in a separate directory.
  80# To locate output files in a separate directory two syntaxes are supported.
  81# In both cases the working directory must be the root of the kernel src.
  82# 1) O=
  83# Use "make O=dir/to/store/output/files/"
  84#
  85# 2) Set KBUILD_OUTPUT
  86# Set the environment variable KBUILD_OUTPUT to point to the directory
  87# where the output files shall be placed.
  88# export KBUILD_OUTPUT=dir/to/store/output/files/
  89# make
  90#
  91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92# variable.
  93
  94
  95# KBUILD_SRC is set on invocation of make in OBJ directory
  96# KBUILD_SRC is not intended to be used by the regular user (for now)
  97ifeq ($(KBUILD_SRC),)
  98
  99# OK, Make called in directory where kernel src resides
 100# Do we want to locate output files in a separate directory?
 101ifeq ("$(origin O)", "command line")
 102  KBUILD_OUTPUT := $(O)
 103endif
 104
 105ifeq ("$(origin W)", "command line")
 106  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 107endif
 108
 109# That's our default target when none is given on the command line
 110PHONY := _all
 111_all:
 112
 113# Cancel implicit rules on top Makefile
 114$(CURDIR)/Makefile Makefile: ;
 115
 116ifneq ($(KBUILD_OUTPUT),)
 117# Invoke a second make in the output directory, passing relevant variables
 118# check that the output directory actually exists
 119saved-output := $(KBUILD_OUTPUT)
 120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 121$(if $(KBUILD_OUTPUT),, \
 122     $(error output directory "$(saved-output)" does not exist))
 123
 124PHONY += $(MAKECMDGOALS) sub-make
 125
 126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 127        $(Q)@:
 128
 129sub-make: FORCE
 130        $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 131        KBUILD_SRC=$(CURDIR) \
 132        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 133        $(filter-out _all sub-make,$(MAKECMDGOALS))
 134
 135# Leave processing to above invocation of make
 136skip-makefile := 1
 137endif # ifneq ($(KBUILD_OUTPUT),)
 138endif # ifeq ($(KBUILD_SRC),)
 139
 140# We process the rest of the Makefile if this is the final invocation of make
 141ifeq ($(skip-makefile),)
 142
 143# If building an external module we do not care about the all: rule
 144# but instead _all depend on modules
 145PHONY += all
 146ifeq ($(KBUILD_EXTMOD),)
 147_all: all
 148else
 149_all: modules
 150endif
 151
 152srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 153objtree         := $(CURDIR)
 154src             := $(srctree)
 155obj             := $(objtree)
 156
 157VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159export srctree objtree VPATH
 160
 161
 162# SUBARCH tells the usermode build what the underlying arch is.  That is set
 163# first, and if a usermode build is happening, the "ARCH=um" on the command
 164# line overrides the setting of ARCH below.  If a native build is happening,
 165# then ARCH is assigned, getting whatever value it gets normally, and 
 166# SUBARCH is subsequently ignored.
 167
 168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                  -e s/sh[234].*/sh/ )
 173
 174# Cross compiling and selecting different set of gcc/bin-utils
 175# ---------------------------------------------------------------------------
 176#
 177# When performing cross compilation for other architectures ARCH shall be set
 178# to the target architecture. (See arch/* for the possibilities).
 179# ARCH can be set during invocation of make:
 180# make ARCH=ia64
 181# Another way is to have ARCH set in the environment.
 182# The default ARCH is the host where make is executed.
 183
 184# CROSS_COMPILE specify the prefix used for all executables used
 185# during compilation. Only gcc and related bin-utils executables
 186# are prefixed with $(CROSS_COMPILE).
 187# CROSS_COMPILE can be set on the command line
 188# make CROSS_COMPILE=ia64-linux-
 189# Alternatively CROSS_COMPILE can be set in the environment.
 190# A third alternative is to store a setting in .config so that plain
 191# "make" in the configured kernel build directory always uses that.
 192# Default value for CROSS_COMPILE is not to prefix executables
 193# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 194export KBUILD_BUILDHOST := $(SUBARCH)
 195ARCH            ?= $(SUBARCH)
 196CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 197
 198# Architecture as present in compile.h
 199UTS_MACHINE     := $(ARCH)
 200SRCARCH         := $(ARCH)
 201
 202# Additional ARCH settings for x86
 203ifeq ($(ARCH),i386)
 204        SRCARCH := x86
 205endif
 206ifeq ($(ARCH),x86_64)
 207        SRCARCH := x86
 208endif
 209
 210# Additional ARCH settings for sparc
 211ifeq ($(ARCH),sparc32)
 212       SRCARCH := sparc
 213endif
 214ifeq ($(ARCH),sparc64)
 215       SRCARCH := sparc
 216endif
 217
 218# Additional ARCH settings for sh
 219ifeq ($(ARCH),sh64)
 220       SRCARCH := sh
 221endif
 222
 223# Additional ARCH settings for tile
 224ifeq ($(ARCH),tilepro)
 225       SRCARCH := tile
 226endif
 227ifeq ($(ARCH),tilegx)
 228       SRCARCH := tile
 229endif
 230
 231# Where to locate arch specific headers
 232hdr-arch  := $(SRCARCH)
 233
 234ifeq ($(ARCH),m68knommu)
 235       hdr-arch  := m68k
 236endif
 237
 238KCONFIG_CONFIG  ?= .config
 239export KCONFIG_CONFIG
 240
 241# SHELL used by kbuild
 242CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 243          else if [ -x /bin/bash ]; then echo /bin/bash; \
 244          else echo sh; fi ; fi)
 245
 246HOSTCC       = gcc
 247HOSTCXX      = g++
 248HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 249HOSTCXXFLAGS = -O2
 250
 251# Decide whether to build built-in, modular, or both.
 252# Normally, just do built-in.
 253
 254KBUILD_MODULES :=
 255KBUILD_BUILTIN := 1
 256
 257#       If we have only "make modules", don't compile built-in objects.
 258#       When we're building modules with modversions, we need to consider
 259#       the built-in objects during the descend as well, in order to
 260#       make sure the checksums are up to date before we record them.
 261
 262ifeq ($(MAKECMDGOALS),modules)
 263  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 264endif
 265
 266#       If we have "make <whatever> modules", compile modules
 267#       in addition to whatever we do anyway.
 268#       Just "make" or "make all" shall build modules as well
 269
 270ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 271  KBUILD_MODULES := 1
 272endif
 273
 274ifeq ($(MAKECMDGOALS),)
 275  KBUILD_MODULES := 1
 276endif
 277
 278export KBUILD_MODULES KBUILD_BUILTIN
 279export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 280
 281# Beautify output
 282# ---------------------------------------------------------------------------
 283#
 284# Normally, we echo the whole command before executing it. By making
 285# that echo $($(quiet)$(cmd)), we now have the possibility to set
 286# $(quiet) to choose other forms of output instead, e.g.
 287#
 288#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 289#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 290#
 291# If $(quiet) is empty, the whole command will be printed.
 292# If it is set to "quiet_", only the short version will be printed. 
 293# If it is set to "silent_", nothing will be printed at all, since
 294# the variable $(silent_cmd_cc_o_c) doesn't exist.
 295#
 296# A simple variant is to prefix commands with $(Q) - that's useful
 297# for commands that shall be hidden in non-verbose mode.
 298#
 299#       $(Q)ln $@ :<
 300#
 301# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 302# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 303
 304ifeq ($(KBUILD_VERBOSE),1)
 305  quiet =
 306  Q =
 307else
 308  quiet=quiet_
 309  Q = @
 310endif
 311
 312# If the user is running make -s (silent mode), suppress echoing of
 313# commands
 314
 315ifneq ($(findstring s,$(MAKEFLAGS)),)
 316  quiet=silent_
 317endif
 318
 319export quiet Q KBUILD_VERBOSE
 320
 321
 322# Look for make include files relative to root of kernel src
 323MAKEFLAGS += --include-dir=$(srctree)
 324
 325# We need some generic definitions (do not try to remake the file).
 326$(srctree)/scripts/Kbuild.include: ;
 327include $(srctree)/scripts/Kbuild.include
 328
 329# Make variables (CC, etc...)
 330
 331AS              = $(CROSS_COMPILE)as
 332LD              = $(CROSS_COMPILE)ld
 333CC              = $(CROSS_COMPILE)gcc
 334CPP             = $(CC) -E
 335AR              = $(CROSS_COMPILE)ar
 336NM              = $(CROSS_COMPILE)nm
 337STRIP           = $(CROSS_COMPILE)strip
 338OBJCOPY         = $(CROSS_COMPILE)objcopy
 339OBJDUMP         = $(CROSS_COMPILE)objdump
 340AWK             = awk
 341GENKSYMS        = scripts/genksyms/genksyms
 342INSTALLKERNEL  := installkernel
 343DEPMOD          = /sbin/depmod
 344KALLSYMS        = scripts/kallsyms
 345PERL            = perl
 346CHECK           = sparse
 347
 348CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 349                  -Wbitwise -Wno-return-void $(CF)
 350CFLAGS_MODULE   =
 351AFLAGS_MODULE   =
 352LDFLAGS_MODULE  =
 353CFLAGS_KERNEL   =
 354AFLAGS_KERNEL   =
 355CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 356
 357
 358# Use LINUXINCLUDE when you must reference the include/ directory.
 359# Needed to be compatible with the O= option
 360LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include \
 361                   -Iarch/$(hdr-arch)/include/generated -Iinclude \
 362                   $(if $(KBUILD_SRC), -I$(srctree)/include) \
 363                   -include $(srctree)/include/linux/kconfig.h
 364
 365KBUILD_CPPFLAGS := -D__KERNEL__
 366
 367KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 368                   -fno-strict-aliasing -fno-common \
 369                   -Werror-implicit-function-declaration \
 370                   -Wno-format-security \
 371                   -fno-delete-null-pointer-checks
 372KBUILD_AFLAGS_KERNEL :=
 373KBUILD_CFLAGS_KERNEL :=
 374KBUILD_AFLAGS   := -D__ASSEMBLY__
 375KBUILD_AFLAGS_MODULE  := -DMODULE
 376KBUILD_CFLAGS_MODULE  := -DMODULE
 377KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 378
 379# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 380KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 381KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 382
 383export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 384export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 385export CPP AR NM STRIP OBJCOPY OBJDUMP
 386export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 387export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 388
 389export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 390export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 391export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 392export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 393export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 394export KBUILD_ARFLAGS
 395
 396# When compiling out-of-tree modules, put MODVERDIR in the module
 397# tree rather than in the kernel tree. The kernel tree might
 398# even be read-only.
 399export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 400
 401# Files to ignore in find ... statements
 402
 403RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 404export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 405
 406# ===========================================================================
 407# Rules shared between *config targets and build targets
 408
 409# Basic helpers built in scripts/
 410PHONY += scripts_basic
 411scripts_basic:
 412        $(Q)$(MAKE) $(build)=scripts/basic
 413        $(Q)rm -f .tmp_quiet_recordmcount
 414
 415# To avoid any implicit rule to kick in, define an empty command.
 416scripts/basic/%: scripts_basic ;
 417
 418PHONY += outputmakefile
 419# outputmakefile generates a Makefile in the output directory, if using a
 420# separate output directory. This allows convenient use of make in the
 421# output directory.
 422outputmakefile:
 423ifneq ($(KBUILD_SRC),)
 424        $(Q)ln -fsn $(srctree) source
 425        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 426            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 427endif
 428
 429# Support for using generic headers in asm-generic
 430PHONY += asm-generic
 431asm-generic:
 432        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 433                    obj=arch/$(SRCARCH)/include/generated/asm
 434
 435# To make sure we do not include .config for any of the *config targets
 436# catch them early, and hand them over to scripts/kconfig/Makefile
 437# It is allowed to specify more targets when calling make, including
 438# mixing *config targets and build targets.
 439# For example 'make oldconfig all'.
 440# Detect when mixed targets is specified, and make a second invocation
 441# of make so .config is not included in this case either (for *config).
 442
 443no-dot-config-targets := clean mrproper distclean \
 444                         cscope gtags TAGS tags help %docs check% coccicheck \
 445                         include/linux/version.h headers_% \
 446                         kernelversion %src-pkg
 447
 448config-targets := 0
 449mixed-targets  := 0
 450dot-config     := 1
 451
 452ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 453        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 454                dot-config := 0
 455        endif
 456endif
 457
 458ifeq ($(KBUILD_EXTMOD),)
 459        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 460                config-targets := 1
 461                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 462                        mixed-targets := 1
 463                endif
 464        endif
 465endif
 466
 467ifeq ($(mixed-targets),1)
 468# ===========================================================================
 469# We're called with mixed targets (*config and build targets).
 470# Handle them one by one.
 471
 472%:: FORCE
 473        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 474
 475else
 476ifeq ($(config-targets),1)
 477# ===========================================================================
 478# *config targets only - make sure prerequisites are updated, and descend
 479# in scripts/kconfig to make the *config target
 480
 481# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 482# KBUILD_DEFCONFIG may point out an alternative default configuration
 483# used for 'make defconfig'
 484include $(srctree)/arch/$(SRCARCH)/Makefile
 485export KBUILD_DEFCONFIG KBUILD_KCONFIG
 486
 487config: scripts_basic outputmakefile FORCE
 488        $(Q)mkdir -p include/linux include/config
 489        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 490
 491%config: scripts_basic outputmakefile FORCE
 492        $(Q)mkdir -p include/linux include/config
 493        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 494
 495else
 496# ===========================================================================
 497# Build targets only - this includes vmlinux, arch specific targets, clean
 498# targets and others. In general all targets except *config targets.
 499
 500ifeq ($(KBUILD_EXTMOD),)
 501# Additional helpers built in scripts/
 502# Carefully list dependencies so we do not try to build scripts twice
 503# in parallel
 504PHONY += scripts
 505scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 506        $(Q)$(MAKE) $(build)=$(@)
 507
 508# Objects we will link into vmlinux / subdirs we need to visit
 509init-y          := init/
 510drivers-y       := drivers/ sound/ firmware/
 511net-y           := net/
 512libs-y          := lib/
 513core-y          := usr/
 514endif # KBUILD_EXTMOD
 515
 516ifeq ($(dot-config),1)
 517# Read in config
 518-include include/config/auto.conf
 519
 520ifeq ($(KBUILD_EXTMOD),)
 521# Read in dependencies to all Kconfig* files, make sure to run
 522# oldconfig if changes are detected.
 523-include include/config/auto.conf.cmd
 524
 525# To avoid any implicit rule to kick in, define an empty command
 526$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 527
 528# If .config is newer than include/config/auto.conf, someone tinkered
 529# with it and forgot to run make oldconfig.
 530# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 531# we execute the config step to be sure to catch updated Kconfig files
 532include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 533        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 534else
 535# external modules needs include/generated/autoconf.h and include/config/auto.conf
 536# but do not care if they are up-to-date. Use auto.conf to trigger the test
 537PHONY += include/config/auto.conf
 538
 539include/config/auto.conf:
 540        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 541        echo;                                                           \
 542        echo "  ERROR: Kernel configuration is invalid.";               \
 543        echo "         include/generated/autoconf.h or $@ are missing.";\
 544        echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 545        echo;                                                           \
 546        /bin/false)
 547
 548endif # KBUILD_EXTMOD
 549
 550else
 551# Dummy target needed, because used as prerequisite
 552include/config/auto.conf: ;
 553endif # $(dot-config)
 554
 555# The all: target is the default when no target is given on the
 556# command line.
 557# This allow a user to issue only 'make' to build a kernel including modules
 558# Defaults to vmlinux, but the arch makefile usually adds further targets
 559all: vmlinux
 560
 561ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 562KBUILD_CFLAGS   += -Os
 563else
 564KBUILD_CFLAGS   += -O2
 565endif
 566
 567include $(srctree)/arch/$(SRCARCH)/Makefile
 568
 569ifneq ($(CONFIG_FRAME_WARN),0)
 570KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 571endif
 572
 573# Force gcc to behave correct even for buggy distributions
 574ifndef CONFIG_CC_STACKPROTECTOR
 575KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 576endif
 577
 578# This warning generated too much noise in a regular build.
 579# Use make W=1 to enable this warning (see scripts/Makefile.build)
 580KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 581
 582ifdef CONFIG_FRAME_POINTER
 583KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 584else
 585# Some targets (ARM with Thumb2, for example), can't be built with frame
 586# pointers.  For those, we don't have FUNCTION_TRACER automatically
 587# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 588# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 589# -fomit-frame-pointer with FUNCTION_TRACER.
 590ifndef CONFIG_FUNCTION_TRACER
 591KBUILD_CFLAGS   += -fomit-frame-pointer
 592endif
 593endif
 594
 595ifdef CONFIG_DEBUG_INFO
 596KBUILD_CFLAGS   += -g
 597KBUILD_AFLAGS   += -gdwarf-2
 598endif
 599
 600ifdef CONFIG_DEBUG_INFO_REDUCED
 601KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 602endif
 603
 604ifdef CONFIG_FUNCTION_TRACER
 605KBUILD_CFLAGS   += -pg
 606ifdef CONFIG_DYNAMIC_FTRACE
 607        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 608                BUILD_C_RECORDMCOUNT := y
 609                export BUILD_C_RECORDMCOUNT
 610        endif
 611endif
 612endif
 613
 614# We trigger additional mismatches with less inlining
 615ifdef CONFIG_DEBUG_SECTION_MISMATCH
 616KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 617endif
 618
 619# arch Makefile may override CC so keep this after arch Makefile is included
 620NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 621CHECKFLAGS     += $(NOSTDINC_FLAGS)
 622
 623# warn about C99 declaration after statement
 624KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 625
 626# disable pointer signed / unsigned warnings in gcc 4.0
 627KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 628
 629# disable invalid "can't wrap" optimizations for signed / pointers
 630KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 631
 632# conserve stack if available
 633KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 634
 635# use the deterministic mode of AR if available
 636KBUILD_ARFLAGS := $(call ar-option,D)
 637
 638# check for 'asm goto'
 639ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 640        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 641endif
 642
 643# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 644# But warn user when we do so
 645warn-assign = \
 646$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 647
 648ifneq ($(KCPPFLAGS),)
 649        $(call warn-assign,CPPFLAGS)
 650        KBUILD_CPPFLAGS += $(KCPPFLAGS)
 651endif
 652ifneq ($(KAFLAGS),)
 653        $(call warn-assign,AFLAGS)
 654        KBUILD_AFLAGS += $(KAFLAGS)
 655endif
 656ifneq ($(KCFLAGS),)
 657        $(call warn-assign,CFLAGS)
 658        KBUILD_CFLAGS += $(KCFLAGS)
 659endif
 660
 661# Use --build-id when available.
 662LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 663                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 664KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 665LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 666
 667ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 668LDFLAGS_vmlinux += $(call ld-option, -X,)
 669endif
 670
 671# Default kernel image to build when no specific target is given.
 672# KBUILD_IMAGE may be overruled on the command line or
 673# set in the environment
 674# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 675# this default value
 676export KBUILD_IMAGE ?= vmlinux
 677
 678#
 679# INSTALL_PATH specifies where to place the updated kernel and system map
 680# images. Default is /boot, but you can set it to other values
 681export  INSTALL_PATH ?= /boot
 682
 683#
 684# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 685# relocations required by build roots.  This is not defined in the
 686# makefile but the argument can be passed to make if needed.
 687#
 688
 689MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 690export MODLIB
 691
 692#
 693#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 694#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 695#  the default option --strip-debug will be used.  Otherwise,
 696#  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 697
 698ifdef INSTALL_MOD_STRIP
 699ifeq ($(INSTALL_MOD_STRIP),1)
 700mod_strip_cmd = $(STRIP) --strip-debug
 701else
 702mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 703endif # INSTALL_MOD_STRIP=1
 704else
 705mod_strip_cmd = true
 706endif # INSTALL_MOD_STRIP
 707export mod_strip_cmd
 708
 709
 710ifeq ($(KBUILD_EXTMOD),)
 711core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 712
 713vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 714                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 715                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 716
 717vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 718                     $(init-n) $(init-) \
 719                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 720                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 721
 722init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 723core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 724drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 725net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 726libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 727libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 728libs-y          := $(libs-y1) $(libs-y2)
 729
 730# Build vmlinux
 731# ---------------------------------------------------------------------------
 732# vmlinux is built from the objects selected by $(vmlinux-init) and
 733# $(vmlinux-main). Most are built-in.o files from top-level directories
 734# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 735# Ordering when linking is important, and $(vmlinux-init) must be first.
 736#
 737# vmlinux
 738#   ^
 739#   |
 740#   +-< $(vmlinux-init)
 741#   |   +--< init/version.o + more
 742#   |
 743#   +--< $(vmlinux-main)
 744#   |    +--< driver/built-in.o mm/built-in.o + more
 745#   |
 746#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 747#
 748# vmlinux version (uname -v) cannot be updated during normal
 749# descending-into-subdirs phase since we do not yet know if we need to
 750# update vmlinux.
 751# Therefore this step is delayed until just before final link of vmlinux -
 752# except in the kallsyms case where it is done just before adding the
 753# symbols to the kernel.
 754#
 755# System.map is generated to document addresses of all kernel symbols
 756
 757vmlinux-init := $(head-y) $(init-y)
 758vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 759vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 760vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 761export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 762
 763# Rule to link vmlinux - also used during CONFIG_KALLSYMS
 764# May be overridden by arch/$(ARCH)/Makefile
 765quiet_cmd_vmlinux__ ?= LD      $@
 766      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 767      -T $(vmlinux-lds) $(vmlinux-init)                          \
 768      --start-group $(vmlinux-main) --end-group                  \
 769      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 770
 771# Generate new vmlinux version
 772quiet_cmd_vmlinux_version = GEN     .version
 773      cmd_vmlinux_version = set -e;                     \
 774        if [ ! -r .version ]; then                      \
 775          rm -f .version;                               \
 776          echo 1 >.version;                             \
 777        else                                            \
 778          mv .version .old_version;                     \
 779          expr 0$$(cat .old_version) + 1 >.version;     \
 780        fi;                                             \
 781        $(MAKE) $(build)=init
 782
 783# Generate System.map
 784quiet_cmd_sysmap = SYSMAP
 785      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 786
 787# Link of vmlinux
 788# If CONFIG_KALLSYMS is set .version is already updated
 789# Generate System.map and verify that the content is consistent
 790# Use + in front of the vmlinux_version rule to silent warning with make -j2
 791# First command is ':' to allow us to use + in front of the rule
 792define rule_vmlinux__
 793        :
 794        $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 795
 796        $(call cmd,vmlinux__)
 797        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 798
 799        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 800          echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 801        $(cmd_sysmap) $@ System.map;                                         \
 802        if [ $$? -ne 0 ]; then                                               \
 803                rm -f $@;                                                    \
 804                /bin/false;                                                  \
 805        fi;
 806        $(verify_kallsyms)
 807endef
 808
 809
 810ifdef CONFIG_KALLSYMS
 811# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 812# It's a three stage process:
 813# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 814#   empty
 815#   Running kallsyms on that gives us .tmp_kallsyms1.o with
 816#   the right size - vmlinux version (uname -v) is updated during this step
 817# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 818#   but due to the added section, some addresses have shifted.
 819#   From here, we generate a correct .tmp_kallsyms2.o
 820# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 821# o Verify that the System.map from vmlinux matches the map from
 822#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 823# o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
 824#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 825#   temporary bypass to allow the kernel to be built while the
 826#   maintainers work out what went wrong with kallsyms.
 827
 828last_kallsyms := 2
 829
 830ifdef KALLSYMS_EXTRA_PASS
 831ifneq ($(KALLSYMS_EXTRA_PASS),0)
 832last_kallsyms := 3
 833endif
 834endif
 835
 836kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 837
 838define verify_kallsyms
 839        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 840          echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 841          $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 842        $(Q)cmp -s System.map .tmp_System.map ||                             \
 843                (echo Inconsistent kallsyms data;                            \
 844                 echo This is a bug - please report about it;                \
 845                 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround;      \
 846                 rm .tmp_kallsyms* ; /bin/false )
 847endef
 848
 849# Update vmlinux version before link
 850# Use + in front of this rule to silent warning about make -j1
 851# First command is ':' to allow us to use + in front of this rule
 852cmd_ksym_ld = $(cmd_vmlinux__)
 853define rule_ksym_ld
 854        : 
 855        +$(call cmd,vmlinux_version)
 856        $(call cmd,vmlinux__)
 857        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 858endef
 859
 860# Generate .S file with all kernel symbols
 861quiet_cmd_kallsyms = KSYM    $@
 862      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 863                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 864
 865.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 866        $(call if_changed_dep,as_o_S)
 867
 868.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 869        $(call cmd,kallsyms)
 870
 871# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 872.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 873        $(call if_changed_rule,ksym_ld)
 874
 875.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 876        $(call if_changed,vmlinux__)
 877
 878.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 879        $(call if_changed,vmlinux__)
 880
 881# Needs to visit scripts/ before $(KALLSYMS) can be used.
 882$(KALLSYMS): scripts ;
 883
 884# Generate some data for debugging strange kallsyms problems
 885debug_kallsyms: .tmp_map$(last_kallsyms)
 886
 887.tmp_map%: .tmp_vmlinux% FORCE
 888        ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 889
 890.tmp_map3: .tmp_map2
 891
 892.tmp_map2: .tmp_map1
 893
 894endif # ifdef CONFIG_KALLSYMS
 895
 896# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 897# relevant sections renamed as per the linker script.
 898quiet_cmd_vmlinux-modpost = LD      $@
 899      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 900         $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 901         $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 902define rule_vmlinux-modpost
 903        :
 904        +$(call cmd,vmlinux-modpost)
 905        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 906        $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 907endef
 908
 909# vmlinux image - including updated kernel symbols
 910vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 911ifdef CONFIG_HEADERS_CHECK
 912        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 913endif
 914ifdef CONFIG_SAMPLES
 915        $(Q)$(MAKE) $(build)=samples
 916endif
 917ifdef CONFIG_BUILD_DOCSRC
 918        $(Q)$(MAKE) $(build)=Documentation
 919endif
 920        $(call vmlinux-modpost)
 921        $(call if_changed_rule,vmlinux__)
 922        $(Q)rm -f .old_version
 923
 924# build vmlinux.o first to catch section mismatch errors early
 925ifdef CONFIG_KALLSYMS
 926.tmp_vmlinux1: vmlinux.o
 927endif
 928
 929modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 930vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 931        $(call if_changed_rule,vmlinux-modpost)
 932
 933# The actual objects are generated when descending, 
 934# make sure no implicit rule kicks in
 935$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 936
 937# Handle descending into subdirectories listed in $(vmlinux-dirs)
 938# Preset locale variables to speed up the build process. Limit locale
 939# tweaks to this spot to avoid wrong language settings when running
 940# make menuconfig etc.
 941# Error messages still appears in the original language
 942
 943PHONY += $(vmlinux-dirs)
 944$(vmlinux-dirs): prepare scripts
 945        $(Q)$(MAKE) $(build)=$@
 946
 947# Store (new) KERNELRELASE string in include/config/kernel.release
 948include/config/kernel.release: include/config/auto.conf FORCE
 949        $(Q)rm -f $@
 950        $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 951
 952
 953# Things we need to do before we recursively start building the kernel
 954# or the modules are listed in "prepare".
 955# A multi level approach is used. prepareN is processed before prepareN-1.
 956# archprepare is used in arch Makefiles and when processed asm symlink,
 957# version.h and scripts_basic is processed / created.
 958
 959# Listed in dependency order
 960PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 961
 962# prepare3 is used to check if we are building in a separate output directory,
 963# and if so do:
 964# 1) Check that make has not been executed in the kernel src $(srctree)
 965prepare3: include/config/kernel.release
 966ifneq ($(KBUILD_SRC),)
 967        @$(kecho) '  Using $(srctree) as source for kernel'
 968        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 969                echo "  $(srctree) is not clean, please run 'make mrproper'";\
 970                echo "  in the '$(srctree)' directory.";\
 971                /bin/false; \
 972        fi;
 973endif
 974
 975# prepare2 creates a makefile if using a separate output directory
 976prepare2: prepare3 outputmakefile asm-generic
 977
 978prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 979                   include/config/auto.conf
 980        $(cmd_crmodverdir)
 981
 982archprepare: prepare1 scripts_basic
 983
 984prepare0: archprepare FORCE
 985        $(Q)$(MAKE) $(build)=.
 986        $(Q)$(MAKE) $(build)=. missing-syscalls
 987
 988# All the preparing..
 989prepare: prepare0
 990
 991# Generate some files
 992# ---------------------------------------------------------------------------
 993
 994# KERNELRELEASE can change from a few different places, meaning version.h
 995# needs to be updated, so this check is forced on all builds
 996
 997uts_len := 64
 998define filechk_utsrelease.h
 999        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1000          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1001          exit 1;                                                         \
1002        fi;                                                               \
1003        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1004endef
1005
1006define filechk_version.h
1007        (echo \#define LINUX_VERSION_CODE $(shell                             \
1008        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL));    \
1009        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1010endef
1011
1012include/linux/version.h: $(srctree)/Makefile FORCE
1013        $(call filechk,version.h)
1014
1015include/generated/utsrelease.h: include/config/kernel.release FORCE
1016        $(call filechk,utsrelease.h)
1017
1018PHONY += headerdep
1019headerdep:
1020        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1021        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1022
1023# ---------------------------------------------------------------------------
1024
1025PHONY += depend dep
1026depend dep:
1027        @echo '*** Warning: make $@ is unnecessary now.'
1028
1029# ---------------------------------------------------------------------------
1030# Firmware install
1031INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1032export INSTALL_FW_PATH
1033
1034PHONY += firmware_install
1035firmware_install: FORCE
1036        @mkdir -p $(objtree)/firmware
1037        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1038
1039# ---------------------------------------------------------------------------
1040# Kernel headers
1041
1042#Default location for installed headers
1043export INSTALL_HDR_PATH = $(objtree)/usr
1044
1045hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1046
1047# If we do an all arch process set dst to asm-$(hdr-arch)
1048hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1049
1050PHONY += __headers
1051__headers: include/linux/version.h scripts_basic asm-generic FORCE
1052        $(Q)$(MAKE) $(build)=scripts build_unifdef
1053
1054PHONY += headers_install_all
1055headers_install_all:
1056        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1057
1058PHONY += headers_install
1059headers_install: __headers
1060        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1061        $(error Headers not exportable for the $(SRCARCH) architecture))
1062        $(Q)$(MAKE) $(hdr-inst)=include
1063        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1064
1065PHONY += headers_check_all
1066headers_check_all: headers_install_all
1067        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1068
1069PHONY += headers_check
1070headers_check: headers_install
1071        $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1072        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1073
1074# ---------------------------------------------------------------------------
1075# Modules
1076
1077ifdef CONFIG_MODULES
1078
1079# By default, build modules as well
1080
1081all: modules
1082
1083#       Build modules
1084#
1085#       A module can be listed more than once in obj-m resulting in
1086#       duplicate lines in modules.order files.  Those are removed
1087#       using awk while concatenating to the final file.
1088
1089PHONY += modules
1090modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1091        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1092        @$(kecho) '  Building modules, stage 2.';
1093        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1094        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1095
1096modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1097        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1098
1099%/modules.builtin: include/config/auto.conf
1100        $(Q)$(MAKE) $(modbuiltin)=$*
1101
1102
1103# Target to prepare building external modules
1104PHONY += modules_prepare
1105modules_prepare: prepare scripts
1106
1107# Target to install modules
1108PHONY += modules_install
1109modules_install: _modinst_ _modinst_post
1110
1111PHONY += _modinst_
1112_modinst_:
1113        @rm -rf $(MODLIB)/kernel
1114        @rm -f $(MODLIB)/source
1115        @mkdir -p $(MODLIB)/kernel
1116        @ln -s $(srctree) $(MODLIB)/source
1117        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1118                rm -f $(MODLIB)/build ; \
1119                ln -s $(objtree) $(MODLIB)/build ; \
1120        fi
1121        @cp -f $(objtree)/modules.order $(MODLIB)/
1122        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1123        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1124
1125# This depmod is only for convenience to give the initial
1126# boot a modules.dep even before / is mounted read-write.  However the
1127# boot script depmod is the master version.
1128PHONY += _modinst_post
1129_modinst_post: _modinst_
1130        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1131        $(call cmd,depmod)
1132
1133else # CONFIG_MODULES
1134
1135# Modules not configured
1136# ---------------------------------------------------------------------------
1137
1138modules modules_install: FORCE
1139        @echo
1140        @echo "The present kernel configuration has modules disabled."
1141        @echo "Type 'make config' and enable loadable module support."
1142        @echo "Then build a kernel with module support enabled."
1143        @echo
1144        @exit 1
1145
1146endif # CONFIG_MODULES
1147
1148###
1149# Cleaning is done on three levels.
1150# make clean     Delete most generated files
1151#                Leave enough to build external modules
1152# make mrproper  Delete the current configuration, and all generated files
1153# make distclean Remove editor backup files, patch leftover files and the like
1154
1155# Directories & files removed with 'make clean'
1156CLEAN_DIRS  += $(MODVERDIR)
1157CLEAN_FILES +=  vmlinux System.map \
1158                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1159
1160# Directories & files removed with 'make mrproper'
1161MRPROPER_DIRS  += include/config usr/include include/generated          \
1162                  arch/*/include/generated
1163MRPROPER_FILES += .config .config.old .version .old_version             \
1164                  include/linux/version.h                               \
1165                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1166
1167# clean - Delete most, but leave enough to build external modules
1168#
1169clean: rm-dirs  := $(CLEAN_DIRS)
1170clean: rm-files := $(CLEAN_FILES)
1171clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1172
1173PHONY += $(clean-dirs) clean archclean
1174$(clean-dirs):
1175        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1176
1177clean: archclean
1178
1179# mrproper - Delete all generated files, including .config
1180#
1181mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1182mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1183mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1184
1185PHONY += $(mrproper-dirs) mrproper archmrproper
1186$(mrproper-dirs):
1187        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1188
1189mrproper: clean archmrproper $(mrproper-dirs)
1190        $(call cmd,rmdirs)
1191        $(call cmd,rmfiles)
1192
1193# distclean
1194#
1195PHONY += distclean
1196
1197distclean: mrproper
1198        @find $(srctree) $(RCS_FIND_IGNORE) \
1199                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1200                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1201                -o -name '.*.rej' -o -size 0 \
1202                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1203                -type f -print | xargs rm -f
1204
1205
1206# Packaging of the kernel to various formats
1207# ---------------------------------------------------------------------------
1208# rpm target kept for backward compatibility
1209package-dir     := $(srctree)/scripts/package
1210
1211%src-pkg: FORCE
1212        $(Q)$(MAKE) $(build)=$(package-dir) $@
1213%pkg: include/config/kernel.release FORCE
1214        $(Q)$(MAKE) $(build)=$(package-dir) $@
1215rpm: include/config/kernel.release FORCE
1216        $(Q)$(MAKE) $(build)=$(package-dir) $@
1217
1218
1219# Brief documentation of the typical targets used
1220# ---------------------------------------------------------------------------
1221
1222boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1223boards := $(notdir $(boards))
1224board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1225board-dirs := $(sort $(notdir $(board-dirs:/=)))
1226
1227help:
1228        @echo  'Cleaning targets:'
1229        @echo  '  clean           - Remove most generated files but keep the config and'
1230        @echo  '                    enough build support to build external modules'
1231        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1232        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1233        @echo  ''
1234        @echo  'Configuration targets:'
1235        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1236        @echo  ''
1237        @echo  'Other generic targets:'
1238        @echo  '  all             - Build all targets marked with [*]'
1239        @echo  '* vmlinux         - Build the bare kernel'
1240        @echo  '* modules         - Build all modules'
1241        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1242        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1243        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1244        @echo  '  dir/            - Build all files in dir and below'
1245        @echo  '  dir/file.[oisS] - Build specified target only'
1246        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1247        @echo  '                    (requires a recent binutils and recent build (System.map))'
1248        @echo  '  dir/file.ko     - Build module including final link'
1249        @echo  '  modules_prepare - Set up for building external modules'
1250        @echo  '  tags/TAGS       - Generate tags file for editors'
1251        @echo  '  cscope          - Generate cscope index'
1252        @echo  '  gtags           - Generate GNU GLOBAL index'
1253        @echo  '  kernelrelease   - Output the release version string'
1254        @echo  '  kernelversion   - Output the version stored in Makefile'
1255        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1256         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1257         echo  ''
1258        @echo  'Static analysers'
1259        @echo  '  checkstack      - Generate a list of stack hogs'
1260        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1261        @echo  '  versioncheck    - Sanity check on version.h usage'
1262        @echo  '  includecheck    - Check for duplicate included header files'
1263        @echo  '  export_report   - List the usages of all exported symbols'
1264        @echo  '  headers_check   - Sanity check on exported headers'
1265        @echo  '  headerdep       - Detect inclusion cycles in headers'
1266        @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1267        @echo  ''
1268        @echo  'Kernel packaging:'
1269        @$(MAKE) $(build)=$(package-dir) help
1270        @echo  ''
1271        @echo  'Documentation targets:'
1272        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1273        @echo  ''
1274        @echo  'Architecture specific targets ($(SRCARCH)):'
1275        @$(if $(archhelp),$(archhelp),\
1276                echo '  No architecture specific help defined for $(SRCARCH)')
1277        @echo  ''
1278        @$(if $(boards), \
1279                $(foreach b, $(boards), \
1280                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1281                echo '')
1282        @$(if $(board-dirs), \
1283                $(foreach b, $(board-dirs), \
1284                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1285                printf "  %-16s - Show all of the above\\n" help-boards; \
1286                echo '')
1287
1288        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1289        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1290        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1291        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1292        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1293        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1294        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1295        @echo  '                1: warnings which may be relevant and do not occur too often'
1296        @echo  '                2: warnings which occur quite often but may still be relevant'
1297        @echo  '                3: more obscure warnings, can most likely be ignored'
1298        @echo  '                Multiple levels can be combined with W=12 or W=123'
1299        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
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)=scripts build_docproc
1323        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1324
1325else # KBUILD_EXTMOD
1326
1327###
1328# External module support.
1329# When building external modules the kernel used as basis is considered
1330# read-only, and no consistency checks are made and the make
1331# system is not used on the basis kernel. If updates are required
1332# in the basis kernel ordinary make commands (without M=...) must
1333# be used.
1334#
1335# The following are the only valid targets when building external
1336# modules.
1337# make M=dir clean     Delete all automatically generated files
1338# make M=dir modules   Make all modules in specified dir
1339# make M=dir           Same as 'make M=dir modules'
1340# make M=dir modules_install
1341#                      Install the modules built in the module directory
1342#                      Assumes install directory is already created
1343
1344# We are always building modules
1345KBUILD_MODULES := 1
1346PHONY += crmodverdir
1347crmodverdir:
1348        $(cmd_crmodverdir)
1349
1350PHONY += $(objtree)/Module.symvers
1351$(objtree)/Module.symvers:
1352        @test -e $(objtree)/Module.symvers || ( \
1353        echo; \
1354        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1355        echo "           is missing; modules will have no dependencies and modversions."; \
1356        echo )
1357
1358module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1359PHONY += $(module-dirs) modules
1360$(module-dirs): crmodverdir $(objtree)/Module.symvers
1361        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1362
1363modules: $(module-dirs)
1364        @$(kecho) '  Building modules, stage 2.';
1365        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1366
1367PHONY += modules_install
1368modules_install: _emodinst_ _emodinst_post
1369
1370install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1371PHONY += _emodinst_
1372_emodinst_:
1373        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1374        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1375
1376PHONY += _emodinst_post
1377_emodinst_post: _emodinst_
1378        $(call cmd,depmod)
1379
1380clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1381
1382PHONY += $(clean-dirs) clean
1383$(clean-dirs):
1384        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1385
1386clean:  rm-dirs := $(MODVERDIR)
1387clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1388
1389help:
1390        @echo  '  Building external modules.'
1391        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1392        @echo  ''
1393        @echo  '  modules         - default target, build the module(s)'
1394        @echo  '  modules_install - install the module'
1395        @echo  '  clean           - remove generated files in module directory only'
1396        @echo  ''
1397
1398# Dummies...
1399PHONY += prepare scripts
1400prepare: ;
1401scripts: ;
1402endif # KBUILD_EXTMOD
1403
1404clean: $(clean-dirs)
1405        $(call cmd,rmdirs)
1406        $(call cmd,rmfiles)
1407        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1408                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1409                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1410                -o -name '*.symtypes' -o -name 'modules.order' \
1411                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1412                -o -name '*.gcno' \) -type f -print | xargs rm -f
1413
1414# Generate tags for editors
1415# ---------------------------------------------------------------------------
1416quiet_cmd_tags = GEN     $@
1417      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1418
1419tags TAGS cscope gtags: FORCE
1420        $(call cmd,tags)
1421
1422# Scripts to check various things for consistency
1423# ---------------------------------------------------------------------------
1424
1425PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1426
1427includecheck:
1428        find $(srctree)/* $(RCS_FIND_IGNORE) \
1429                -name '*.[hcS]' -type f -print | sort \
1430                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1431
1432versioncheck:
1433        find $(srctree)/* $(RCS_FIND_IGNORE) \
1434                -name '*.[hcS]' -type f -print | sort \
1435                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1436
1437coccicheck:
1438        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1439
1440namespacecheck:
1441        $(PERL) $(srctree)/scripts/namespace.pl
1442
1443export_report:
1444        $(PERL) $(srctree)/scripts/export_report.pl
1445
1446endif #ifeq ($(config-targets),1)
1447endif #ifeq ($(mixed-targets),1)
1448
1449PHONY += checkstack kernelrelease kernelversion
1450
1451# UML needs a little special treatment here.  It wants to use the host
1452# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1453# else wants $(ARCH), including people doing cross-builds, which means
1454# that $(SUBARCH) doesn't work here.
1455ifeq ($(ARCH), um)
1456CHECKSTACK_ARCH := $(SUBARCH)
1457else
1458CHECKSTACK_ARCH := $(ARCH)
1459endif
1460checkstack:
1461        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1462        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1463
1464kernelrelease:
1465        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1466
1467kernelversion:
1468        @echo $(KERNELVERSION)
1469
1470# Single targets
1471# ---------------------------------------------------------------------------
1472# Single targets are compatible with:
1473# - build with mixed source and output
1474# - build with separate output dir 'make O=...'
1475# - external modules
1476#
1477#  target-dir => where to store outputfile
1478#  build-dir  => directory in kernel source tree to use
1479
1480ifeq ($(KBUILD_EXTMOD),)
1481        build-dir  = $(patsubst %/,%,$(dir $@))
1482        target-dir = $(dir $@)
1483else
1484        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1485        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1486        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1487endif
1488
1489%.s: %.c prepare scripts FORCE
1490        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1491%.i: %.c prepare scripts FORCE
1492        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1493%.o: %.c prepare scripts FORCE
1494        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495%.lst: %.c prepare scripts FORCE
1496        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1497%.s: %.S prepare scripts FORCE
1498        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499%.o: %.S prepare scripts FORCE
1500        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501%.symtypes: %.c prepare scripts FORCE
1502        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1503
1504# Modules
1505/: prepare scripts FORCE
1506        $(cmd_crmodverdir)
1507        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1508        $(build)=$(build-dir)
1509%/: prepare scripts FORCE
1510        $(cmd_crmodverdir)
1511        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1512        $(build)=$(build-dir)
1513%.ko: prepare scripts FORCE
1514        $(cmd_crmodverdir)
1515        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1516        $(build)=$(build-dir) $(@:.ko=.o)
1517        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1518
1519# FIXME Should go into a make.lib or something 
1520# ===========================================================================
1521
1522quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1523      cmd_rmdirs = rm -rf $(rm-dirs)
1524
1525quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1526      cmd_rmfiles = rm -f $(rm-files)
1527
1528# Run depmod only if we have System.map and depmod is executable
1529quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1530      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1531                   $(KERNELRELEASE)
1532
1533# Create temporary dir for module support files
1534# clean it up only when building all modules
1535cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1536                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1537
1538a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1539          $(KBUILD_AFLAGS_KERNEL)                              \
1540          $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1541          $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1542
1543quiet_cmd_as_o_S = AS      $@
1544cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1545
1546# read all saved command lines
1547
1548targets := $(wildcard $(sort $(targets)))
1549cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1550
1551ifneq ($(cmd_files),)
1552  $(cmd_files): ;       # Do not try to update included dependency files
1553  include $(cmd_files)
1554endif
1555
1556# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1557# Usage:
1558# $(Q)$(MAKE) $(clean)=dir
1559clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1560
1561endif   # skip-makefile
1562
1563PHONY += FORCE
1564FORCE:
1565
1566# Declare the contents of the .PHONY variable as phony.  We keep that
1567# information in a variable so we can use it in if_changed and friends.
1568.PHONY: $(PHONY)
1569
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.