linux/Makefile
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   1VERSION = 4
   2PATCHLEVEL = 8
   3SUBLEVEL = 0
   4EXTRAVERSION =
   5NAME = Psychotic Stoned Sheep
   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# o Do not use make's built-in rules and variables
  14#   (this increases performance and avoids hard-to-debug behaviour);
  15# o Look for make include files relative to root of kernel src
  16MAKEFLAGS += -rR --include-dir=$(CURDIR)
  17
  18# Avoid funny character set dependencies
  19unexport LC_ALL
  20LC_COLLATE=C
  21LC_NUMERIC=C
  22export LC_COLLATE LC_NUMERIC
  23
  24# Avoid interference with shell env settings
  25unexport GREP_OPTIONS
  26
  27# We are using a recursive build, so we need to do a little thinking
  28# to get the ordering right.
  29#
  30# Most importantly: sub-Makefiles should only ever modify files in
  31# their own directory. If in some directory we have a dependency on
  32# a file in another dir (which doesn't happen often, but it's often
  33# unavoidable when linking the built-in.o targets which finally
  34# turn into vmlinux), we will call a sub make in that other dir, and
  35# after that we are sure that everything which is in that other dir
  36# is now up to date.
  37#
  38# The only cases where we need to modify files which have global
  39# effects are thus separated out and done before the recursive
  40# descending is started. They are now explicitly listed as the
  41# prepare rule.
  42
  43# Beautify output
  44# ---------------------------------------------------------------------------
  45#
  46# Normally, we echo the whole command before executing it. By making
  47# that echo $($(quiet)$(cmd)), we now have the possibility to set
  48# $(quiet) to choose other forms of output instead, e.g.
  49#
  50#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  51#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  52#
  53# If $(quiet) is empty, the whole command will be printed.
  54# If it is set to "quiet_", only the short version will be printed.
  55# If it is set to "silent_", nothing will be printed at all, since
  56# the variable $(silent_cmd_cc_o_c) doesn't exist.
  57#
  58# A simple variant is to prefix commands with $(Q) - that's useful
  59# for commands that shall be hidden in non-verbose mode.
  60#
  61#       $(Q)ln $@ :<
  62#
  63# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  64# If KBUILD_VERBOSE equals 1 then the above command is displayed.
  65#
  66# To put more focus on warnings, be less verbose as default
  67# Use 'make V=1' to see the full commands
  68
  69ifeq ("$(origin V)", "command line")
  70  KBUILD_VERBOSE = $(V)
  71endif
  72ifndef KBUILD_VERBOSE
  73  KBUILD_VERBOSE = 0
  74endif
  75
  76ifeq ($(KBUILD_VERBOSE),1)
  77  quiet =
  78  Q =
  79else
  80  quiet=quiet_
  81  Q = @
  82endif
  83
  84# If the user is running make -s (silent mode), suppress echoing of
  85# commands
  86
  87ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
  88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  89  quiet=silent_
  90endif
  91else                                    # make-3.8x
  92ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  93  quiet=silent_
  94endif
  95endif
  96
  97export quiet Q KBUILD_VERBOSE
  98
  99# kbuild supports saving output files in a separate directory.
 100# To locate output files in a separate directory two syntaxes are supported.
 101# In both cases the working directory must be the root of the kernel src.
 102# 1) O=
 103# Use "make O=dir/to/store/output/files/"
 104#
 105# 2) Set KBUILD_OUTPUT
 106# Set the environment variable KBUILD_OUTPUT to point to the directory
 107# where the output files shall be placed.
 108# export KBUILD_OUTPUT=dir/to/store/output/files/
 109# make
 110#
 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112# variable.
 113
 114# KBUILD_SRC is set on invocation of make in OBJ directory
 115# KBUILD_SRC is not intended to be used by the regular user (for now)
 116ifeq ($(KBUILD_SRC),)
 117
 118# OK, Make called in directory where kernel src resides
 119# Do we want to locate output files in a separate directory?
 120ifeq ("$(origin O)", "command line")
 121  KBUILD_OUTPUT := $(O)
 122endif
 123
 124# That's our default target when none is given on the command line
 125PHONY := _all
 126_all:
 127
 128# Cancel implicit rules on top Makefile
 129$(CURDIR)/Makefile Makefile: ;
 130
 131ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 132  $(error main directory cannot contain spaces nor colons)
 133endif
 134
 135ifneq ($(KBUILD_OUTPUT),)
 136# Invoke a second make in the output directory, passing relevant variables
 137# check that the output directory actually exists
 138saved-output := $(KBUILD_OUTPUT)
 139KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 140                                                                && /bin/pwd)
 141$(if $(KBUILD_OUTPUT),, \
 142     $(error failed to create output directory "$(saved-output)"))
 143
 144PHONY += $(MAKECMDGOALS) sub-make
 145
 146$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 147        @:
 148
 149sub-make:
 150        $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 151        -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 152
 153# Leave processing to above invocation of make
 154skip-makefile := 1
 155endif # ifneq ($(KBUILD_OUTPUT),)
 156endif # ifeq ($(KBUILD_SRC),)
 157
 158# We process the rest of the Makefile if this is the final invocation of make
 159ifeq ($(skip-makefile),)
 160
 161# Do not print "Entering directory ...",
 162# but we want to display it when entering to the output directory
 163# so that IDEs/editors are able to understand relative filenames.
 164MAKEFLAGS += --no-print-directory
 165
 166# Call a source code checker (by default, "sparse") as part of the
 167# C compilation.
 168#
 169# Use 'make C=1' to enable checking of only re-compiled files.
 170# Use 'make C=2' to enable checking of *all* source files, regardless
 171# of whether they are re-compiled or not.
 172#
 173# See the file "Documentation/sparse.txt" for more details, including
 174# where to get the "sparse" utility.
 175
 176ifeq ("$(origin C)", "command line")
 177  KBUILD_CHECKSRC = $(C)
 178endif
 179ifndef KBUILD_CHECKSRC
 180  KBUILD_CHECKSRC = 0
 181endif
 182
 183# Use make M=dir to specify directory of external module to build
 184# Old syntax make ... SUBDIRS=$PWD is still supported
 185# Setting the environment variable KBUILD_EXTMOD take precedence
 186ifdef SUBDIRS
 187  KBUILD_EXTMOD ?= $(SUBDIRS)
 188endif
 189
 190ifeq ("$(origin M)", "command line")
 191  KBUILD_EXTMOD := $(M)
 192endif
 193
 194# If building an external module we do not care about the all: rule
 195# but instead _all depend on modules
 196PHONY += all
 197ifeq ($(KBUILD_EXTMOD),)
 198_all: all
 199else
 200_all: modules
 201endif
 202
 203ifeq ($(KBUILD_SRC),)
 204        # building in the source tree
 205        srctree := .
 206else
 207        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 208                # building in a subdirectory of the source tree
 209                srctree := ..
 210        else
 211                srctree := $(KBUILD_SRC)
 212        endif
 213endif
 214objtree         := .
 215src             := $(srctree)
 216obj             := $(objtree)
 217
 218VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 219
 220export srctree objtree VPATH
 221
 222# SUBARCH tells the usermode build what the underlying arch is.  That is set
 223# first, and if a usermode build is happening, the "ARCH=um" on the command
 224# line overrides the setting of ARCH below.  If a native build is happening,
 225# then ARCH is assigned, getting whatever value it gets normally, and
 226# SUBARCH is subsequently ignored.
 227
 228SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 229                                  -e s/sun4u/sparc64/ \
 230                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 231                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 232                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 233                                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 234
 235# Cross compiling and selecting different set of gcc/bin-utils
 236# ---------------------------------------------------------------------------
 237#
 238# When performing cross compilation for other architectures ARCH shall be set
 239# to the target architecture. (See arch/* for the possibilities).
 240# ARCH can be set during invocation of make:
 241# make ARCH=ia64
 242# Another way is to have ARCH set in the environment.
 243# The default ARCH is the host where make is executed.
 244
 245# CROSS_COMPILE specify the prefix used for all executables used
 246# during compilation. Only gcc and related bin-utils executables
 247# are prefixed with $(CROSS_COMPILE).
 248# CROSS_COMPILE can be set on the command line
 249# make CROSS_COMPILE=ia64-linux-
 250# Alternatively CROSS_COMPILE can be set in the environment.
 251# A third alternative is to store a setting in .config so that plain
 252# "make" in the configured kernel build directory always uses that.
 253# Default value for CROSS_COMPILE is not to prefix executables
 254# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 255ARCH            ?= $(SUBARCH)
 256CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 257
 258# Architecture as present in compile.h
 259UTS_MACHINE     := $(ARCH)
 260SRCARCH         := $(ARCH)
 261
 262# Additional ARCH settings for x86
 263ifeq ($(ARCH),i386)
 264        SRCARCH := x86
 265endif
 266ifeq ($(ARCH),x86_64)
 267        SRCARCH := x86
 268endif
 269
 270# Additional ARCH settings for sparc
 271ifeq ($(ARCH),sparc32)
 272       SRCARCH := sparc
 273endif
 274ifeq ($(ARCH),sparc64)
 275       SRCARCH := sparc
 276endif
 277
 278# Additional ARCH settings for sh
 279ifeq ($(ARCH),sh64)
 280       SRCARCH := sh
 281endif
 282
 283# Additional ARCH settings for tile
 284ifeq ($(ARCH),tilepro)
 285       SRCARCH := tile
 286endif
 287ifeq ($(ARCH),tilegx)
 288       SRCARCH := tile
 289endif
 290
 291# Where to locate arch specific headers
 292hdr-arch  := $(SRCARCH)
 293
 294KCONFIG_CONFIG  ?= .config
 295export KCONFIG_CONFIG
 296
 297# SHELL used by kbuild
 298CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 299          else if [ -x /bin/bash ]; then echo /bin/bash; \
 300          else echo sh; fi ; fi)
 301
 302HOSTCC       = gcc
 303HOSTCXX      = g++
 304HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 305HOSTCXXFLAGS = -O2
 306
 307ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 308HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 309                -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 310endif
 311
 312# Decide whether to build built-in, modular, or both.
 313# Normally, just do built-in.
 314
 315KBUILD_MODULES :=
 316KBUILD_BUILTIN := 1
 317
 318# If we have only "make modules", don't compile built-in objects.
 319# When we're building modules with modversions, we need to consider
 320# the built-in objects during the descend as well, in order to
 321# make sure the checksums are up to date before we record them.
 322
 323ifeq ($(MAKECMDGOALS),modules)
 324  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 325endif
 326
 327# If we have "make <whatever> modules", compile modules
 328# in addition to whatever we do anyway.
 329# Just "make" or "make all" shall build modules as well
 330
 331ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 332  KBUILD_MODULES := 1
 333endif
 334
 335ifeq ($(MAKECMDGOALS),)
 336  KBUILD_MODULES := 1
 337endif
 338
 339export KBUILD_MODULES KBUILD_BUILTIN
 340export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 341
 342# We need some generic definitions (do not try to remake the file).
 343scripts/Kbuild.include: ;
 344include scripts/Kbuild.include
 345
 346# Make variables (CC, etc...)
 347AS              = $(CROSS_COMPILE)as
 348LD              = $(CROSS_COMPILE)ld
 349CC              = $(CROSS_COMPILE)gcc
 350CPP             = $(CC) -E
 351AR              = $(CROSS_COMPILE)ar
 352NM              = $(CROSS_COMPILE)nm
 353STRIP           = $(CROSS_COMPILE)strip
 354OBJCOPY         = $(CROSS_COMPILE)objcopy
 355OBJDUMP         = $(CROSS_COMPILE)objdump
 356AWK             = awk
 357GENKSYMS        = scripts/genksyms/genksyms
 358INSTALLKERNEL  := installkernel
 359DEPMOD          = /sbin/depmod
 360PERL            = perl
 361PYTHON          = python
 362CHECK           = sparse
 363
 364CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 365                  -Wbitwise -Wno-return-void $(CF)
 366NOSTDINC_FLAGS  =
 367CFLAGS_MODULE   =
 368AFLAGS_MODULE   =
 369LDFLAGS_MODULE  =
 370CFLAGS_KERNEL   =
 371AFLAGS_KERNEL   =
 372LDFLAGS_vmlinux =
 373CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
 374CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 375
 376
 377# Use USERINCLUDE when you must reference the UAPI directories only.
 378USERINCLUDE    := \
 379                -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 380                -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 381                -I$(srctree)/include/uapi \
 382                -I$(objtree)/include/generated/uapi \
 383                -include $(srctree)/include/linux/kconfig.h
 384
 385# Use LINUXINCLUDE when you must reference the include/ directory.
 386# Needed to be compatible with the O= option
 387LINUXINCLUDE    := \
 388                -I$(srctree)/arch/$(hdr-arch)/include \
 389                -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 390                -I$(objtree)/arch/$(hdr-arch)/include/generated \
 391                $(if $(KBUILD_SRC), -I$(srctree)/include) \
 392                -I$(objtree)/include
 393
 394LINUXINCLUDE    += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
 395
 396KBUILD_CPPFLAGS := -D__KERNEL__
 397
 398KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 399                   -fno-strict-aliasing -fno-common \
 400                   -Werror-implicit-function-declaration \
 401                   -Wno-format-security \
 402                   -std=gnu89
 403
 404KBUILD_AFLAGS_KERNEL :=
 405KBUILD_CFLAGS_KERNEL :=
 406KBUILD_AFLAGS   := -D__ASSEMBLY__
 407KBUILD_AFLAGS_MODULE  := -DMODULE
 408KBUILD_CFLAGS_MODULE  := -DMODULE
 409KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 410
 411# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 412KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 413KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 414
 415export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 416export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 417export CPP AR NM STRIP OBJCOPY OBJDUMP
 418export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 419export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 420
 421export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 422export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
 423export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 424export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 425export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 426export KBUILD_ARFLAGS
 427
 428# When compiling out-of-tree modules, put MODVERDIR in the module
 429# tree rather than in the kernel tree. The kernel tree might
 430# even be read-only.
 431export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 432
 433# Files to ignore in find ... statements
 434
 435export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 436                          -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 437                          -prune -o
 438export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 439                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
 440
 441# ===========================================================================
 442# Rules shared between *config targets and build targets
 443
 444# Basic helpers built in scripts/
 445PHONY += scripts_basic
 446scripts_basic:
 447        $(Q)$(MAKE) $(build)=scripts/basic
 448        $(Q)rm -f .tmp_quiet_recordmcount
 449
 450# To avoid any implicit rule to kick in, define an empty command.
 451scripts/basic/%: scripts_basic ;
 452
 453PHONY += outputmakefile
 454# outputmakefile generates a Makefile in the output directory, if using a
 455# separate output directory. This allows convenient use of make in the
 456# output directory.
 457outputmakefile:
 458ifneq ($(KBUILD_SRC),)
 459        $(Q)ln -fsn $(srctree) source
 460        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 461            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 462endif
 463
 464# Support for using generic headers in asm-generic
 465PHONY += asm-generic
 466asm-generic:
 467        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 468                    src=asm obj=arch/$(SRCARCH)/include/generated/asm
 469        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 470                    src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 471
 472# To make sure we do not include .config for any of the *config targets
 473# catch them early, and hand them over to scripts/kconfig/Makefile
 474# It is allowed to specify more targets when calling make, including
 475# mixing *config targets and build targets.
 476# For example 'make oldconfig all'.
 477# Detect when mixed targets is specified, and make a second invocation
 478# of make so .config is not included in this case either (for *config).
 479
 480version_h := include/generated/uapi/linux/version.h
 481old_version_h := include/linux/version.h
 482
 483no-dot-config-targets := clean mrproper distclean \
 484                         cscope gtags TAGS tags help% %docs check% coccicheck \
 485                         $(version_h) headers_% archheaders archscripts \
 486                         kernelversion %src-pkg
 487
 488config-targets := 0
 489mixed-targets  := 0
 490dot-config     := 1
 491
 492ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 493        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 494                dot-config := 0
 495        endif
 496endif
 497
 498ifeq ($(KBUILD_EXTMOD),)
 499        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 500                config-targets := 1
 501                ifneq ($(words $(MAKECMDGOALS)),1)
 502                        mixed-targets := 1
 503                endif
 504        endif
 505endif
 506# install and module_install need also be processed one by one
 507ifneq ($(filter install,$(MAKECMDGOALS)),)
 508        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 509                mixed-targets := 1
 510        endif
 511endif
 512
 513ifeq ($(mixed-targets),1)
 514# ===========================================================================
 515# We're called with mixed targets (*config and build targets).
 516# Handle them one by one.
 517
 518PHONY += $(MAKECMDGOALS) __build_one_by_one
 519
 520$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 521        @:
 522
 523__build_one_by_one:
 524        $(Q)set -e; \
 525        for i in $(MAKECMDGOALS); do \
 526                $(MAKE) -f $(srctree)/Makefile $$i; \
 527        done
 528
 529else
 530ifeq ($(config-targets),1)
 531# ===========================================================================
 532# *config targets only - make sure prerequisites are updated, and descend
 533# in scripts/kconfig to make the *config target
 534
 535# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 536# KBUILD_DEFCONFIG may point out an alternative default configuration
 537# used for 'make defconfig'
 538include arch/$(SRCARCH)/Makefile
 539export KBUILD_DEFCONFIG KBUILD_KCONFIG
 540
 541config: scripts_basic outputmakefile FORCE
 542        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 543
 544%config: scripts_basic outputmakefile FORCE
 545        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 546
 547else
 548# ===========================================================================
 549# Build targets only - this includes vmlinux, arch specific targets, clean
 550# targets and others. In general all targets except *config targets.
 551
 552ifeq ($(KBUILD_EXTMOD),)
 553# Additional helpers built in scripts/
 554# Carefully list dependencies so we do not try to build scripts twice
 555# in parallel
 556PHONY += scripts
 557scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 558         asm-generic gcc-plugins
 559        $(Q)$(MAKE) $(build)=$(@)
 560
 561# Objects we will link into vmlinux / subdirs we need to visit
 562init-y          := init/
 563drivers-y       := drivers/ sound/ firmware/
 564net-y           := net/
 565libs-y          := lib/
 566core-y          := usr/
 567virt-y          := virt/
 568endif # KBUILD_EXTMOD
 569
 570ifeq ($(dot-config),1)
 571# Read in config
 572-include include/config/auto.conf
 573
 574ifeq ($(KBUILD_EXTMOD),)
 575# Read in dependencies to all Kconfig* files, make sure to run
 576# oldconfig if changes are detected.
 577-include include/config/auto.conf.cmd
 578
 579# To avoid any implicit rule to kick in, define an empty command
 580$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 581
 582# If .config is newer than include/config/auto.conf, someone tinkered
 583# with it and forgot to run make oldconfig.
 584# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 585# we execute the config step to be sure to catch updated Kconfig files
 586include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 587        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 588else
 589# external modules needs include/generated/autoconf.h and include/config/auto.conf
 590# but do not care if they are up-to-date. Use auto.conf to trigger the test
 591PHONY += include/config/auto.conf
 592
 593include/config/auto.conf:
 594        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 595        echo >&2;                                                       \
 596        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 597        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 598        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 599        echo >&2 ;                                                      \
 600        /bin/false)
 601
 602endif # KBUILD_EXTMOD
 603
 604else
 605# Dummy target needed, because used as prerequisite
 606include/config/auto.conf: ;
 607endif # $(dot-config)
 608
 609# The all: target is the default when no target is given on the
 610# command line.
 611# This allow a user to issue only 'make' to build a kernel including modules
 612# Defaults to vmlinux, but the arch makefile usually adds further targets
 613all: vmlinux
 614
 615# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 616# values of the respective KBUILD_* variables
 617ARCH_CPPFLAGS :=
 618ARCH_AFLAGS :=
 619ARCH_CFLAGS :=
 620include arch/$(SRCARCH)/Makefile
 621
 622KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 623KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 624
 625ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 626KBUILD_CFLAGS   += -Os
 627else
 628ifdef CONFIG_PROFILE_ALL_BRANCHES
 629KBUILD_CFLAGS   += -O2
 630else
 631KBUILD_CFLAGS   += -O2
 632endif
 633endif
 634
 635# Tell gcc to never replace conditional load with a non-conditional one
 636KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 637
 638include scripts/Makefile.gcc-plugins
 639
 640ifdef CONFIG_READABLE_ASM
 641# Disable optimizations that make assembler listings hard to read.
 642# reorder blocks reorders the control in the function
 643# ipa clone creates specialized cloned functions
 644# partial inlining inlines only parts of functions
 645KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 646                 $(call cc-option,-fno-ipa-cp-clone,) \
 647                 $(call cc-option,-fno-partial-inlining)
 648endif
 649
 650ifneq ($(CONFIG_FRAME_WARN),0)
 651KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 652endif
 653
 654# This selects the stack protector compiler flag. Testing it is delayed
 655# until after .config has been reprocessed, in the prepare-compiler-check
 656# target.
 657ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 658  stackp-flag := -fstack-protector
 659  stackp-name := REGULAR
 660else
 661ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 662  stackp-flag := -fstack-protector-strong
 663  stackp-name := STRONG
 664else
 665  # Force off for distro compilers that enable stack protector by default.
 666  stackp-flag := $(call cc-option, -fno-stack-protector)
 667endif
 668endif
 669# Find arch-specific stack protector compiler sanity-checking script.
 670ifdef CONFIG_CC_STACKPROTECTOR
 671  stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 672  stackp-check := $(wildcard $(stackp-path))
 673endif
 674KBUILD_CFLAGS += $(stackp-flag)
 675
 676ifeq ($(cc-name),clang)
 677KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 678KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 679KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 680KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 681KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 682# Quiet clang warning: comparison of unsigned expression < 0 is always false
 683KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 684# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 685# source of a reference will be _MergedGlobals and not on of the whitelisted names.
 686# See modpost pattern 2
 687KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 688KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 689else
 690
 691# These warnings generated too much noise in a regular build.
 692# Use make W=1 to enable them (see scripts/Makefile.build)
 693KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 694KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 695endif
 696
 697ifdef CONFIG_FRAME_POINTER
 698KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 699else
 700# Some targets (ARM with Thumb2, for example), can't be built with frame
 701# pointers.  For those, we don't have FUNCTION_TRACER automatically
 702# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 703# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 704# -fomit-frame-pointer with FUNCTION_TRACER.
 705ifndef CONFIG_FUNCTION_TRACER
 706KBUILD_CFLAGS   += -fomit-frame-pointer
 707endif
 708endif
 709
 710KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 711
 712ifdef CONFIG_DEBUG_INFO
 713ifdef CONFIG_DEBUG_INFO_SPLIT
 714KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 715else
 716KBUILD_CFLAGS   += -g
 717endif
 718KBUILD_AFLAGS   += -Wa,-gdwarf-2
 719endif
 720ifdef CONFIG_DEBUG_INFO_DWARF4
 721KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 722endif
 723
 724ifdef CONFIG_DEBUG_INFO_REDUCED
 725KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 726                   $(call cc-option,-fno-var-tracking)
 727endif
 728
 729ifdef CONFIG_FUNCTION_TRACER
 730ifndef CC_FLAGS_FTRACE
 731CC_FLAGS_FTRACE := -pg
 732endif
 733export CC_FLAGS_FTRACE
 734ifdef CONFIG_HAVE_FENTRY
 735CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 736endif
 737KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 738KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 739ifdef CONFIG_DYNAMIC_FTRACE
 740        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 741                BUILD_C_RECORDMCOUNT := y
 742                export BUILD_C_RECORDMCOUNT
 743        endif
 744endif
 745endif
 746
 747# We trigger additional mismatches with less inlining
 748ifdef CONFIG_DEBUG_SECTION_MISMATCH
 749KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 750endif
 751
 752# arch Makefile may override CC so keep this after arch Makefile is included
 753NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 754CHECKFLAGS     += $(NOSTDINC_FLAGS)
 755
 756# warn about C99 declaration after statement
 757KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 758
 759# disable pointer signed / unsigned warnings in gcc 4.0
 760KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 761
 762# disable invalid "can't wrap" optimizations for signed / pointers
 763KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 764
 765# conserve stack if available
 766KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 767
 768# disallow errors like 'EXPORT_GPL(foo);' with missing header
 769KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 770
 771# require functions to have arguments in prototypes, not empty 'int foo()'
 772KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 773
 774# Prohibit date/time macros, which would make the build non-deterministic
 775KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 776
 777# enforce correct pointer usage
 778KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 779
 780# use the deterministic mode of AR if available
 781KBUILD_ARFLAGS := $(call ar-option,D)
 782
 783# check for 'asm goto'
 784ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 785        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 786        KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 787endif
 788
 789include scripts/Makefile.kasan
 790include scripts/Makefile.extrawarn
 791include scripts/Makefile.ubsan
 792
 793# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 794# last assignments
 795KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 796KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 797KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 798
 799# Use --build-id when available.
 800LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 801                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 802KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 803LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 804
 805ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 806LDFLAGS_vmlinux += $(call ld-option, -X,)
 807endif
 808
 809# Default kernel image to build when no specific target is given.
 810# KBUILD_IMAGE may be overruled on the command line or
 811# set in the environment
 812# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 813# this default value
 814export KBUILD_IMAGE ?= vmlinux
 815
 816#
 817# INSTALL_PATH specifies where to place the updated kernel and system map
 818# images. Default is /boot, but you can set it to other values
 819export  INSTALL_PATH ?= /boot
 820
 821#
 822# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 823# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 824# an argument if needed. Otherwise it defaults to the kernel install path
 825#
 826export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 827
 828#
 829# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 830# relocations required by build roots.  This is not defined in the
 831# makefile but the argument can be passed to make if needed.
 832#
 833
 834MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 835export MODLIB
 836
 837#
 838# INSTALL_MOD_STRIP, if defined, will cause modules to be
 839# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 840# the default option --strip-debug will be used.  Otherwise,
 841# INSTALL_MOD_STRIP value will be used as the options to the strip command.
 842
 843ifdef INSTALL_MOD_STRIP
 844ifeq ($(INSTALL_MOD_STRIP),1)
 845mod_strip_cmd = $(STRIP) --strip-debug
 846else
 847mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 848endif # INSTALL_MOD_STRIP=1
 849else
 850mod_strip_cmd = true
 851endif # INSTALL_MOD_STRIP
 852export mod_strip_cmd
 853
 854# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 855# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 856# or CONFIG_MODULE_COMPRESS_XZ.
 857
 858mod_compress_cmd = true
 859ifdef CONFIG_MODULE_COMPRESS
 860  ifdef CONFIG_MODULE_COMPRESS_GZIP
 861    mod_compress_cmd = gzip -n -f
 862  endif # CONFIG_MODULE_COMPRESS_GZIP
 863  ifdef CONFIG_MODULE_COMPRESS_XZ
 864    mod_compress_cmd = xz -f
 865  endif # CONFIG_MODULE_COMPRESS_XZ
 866endif # CONFIG_MODULE_COMPRESS
 867export mod_compress_cmd
 868
 869# Select initial ramdisk compression format, default is gzip(1).
 870# This shall be used by the dracut(8) tool while creating an initramfs image.
 871#
 872INITRD_COMPRESS-y                  := gzip
 873INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 874INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 875INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 876INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 877INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 878# do not export INITRD_COMPRESS, since we didn't actually
 879# choose a sane default compression above.
 880# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 881
 882ifdef CONFIG_MODULE_SIG_ALL
 883$(eval $(call config_filename,MODULE_SIG_KEY))
 884
 885mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 886else
 887mod_sign_cmd = true
 888endif
 889export mod_sign_cmd
 890
 891
 892ifeq ($(KBUILD_EXTMOD),)
 893core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 894
 895vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 896                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 897                     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 898
 899vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 900                     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 901
 902init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 903core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 904drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 905net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 906libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 907libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 908libs-y          := $(libs-y1) $(libs-y2)
 909virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 910
 911# Externally visible symbols (used by link-vmlinux.sh)
 912export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 913export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 914export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 915export LDFLAGS_vmlinux
 916# used by scripts/pacmage/Makefile
 917export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 918
 919vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 920
 921# Include targets which we want to execute sequentially if the rest of the
 922# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 923# evaluated more than once.
 924PHONY += vmlinux_prereq
 925vmlinux_prereq: $(vmlinux-deps) FORCE
 926ifdef CONFIG_HEADERS_CHECK
 927        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 928endif
 929ifdef CONFIG_BUILD_DOCSRC
 930        $(Q)$(MAKE) $(build)=Documentation
 931endif
 932ifdef CONFIG_GDB_SCRIPTS
 933        $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 934endif
 935ifdef CONFIG_TRIM_UNUSED_KSYMS
 936        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 937          "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq"
 938endif
 939
 940# standalone target for easier testing
 941include/generated/autoksyms.h: FORCE
 942        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 943
 944# Final link of vmlinux
 945      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 946quiet_cmd_link-vmlinux = LINK    $@
 947
 948vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
 949        +$(call if_changed,link-vmlinux)
 950
 951# Build samples along the rest of the kernel
 952ifdef CONFIG_SAMPLES
 953vmlinux-dirs += samples
 954endif
 955
 956# The actual objects are generated when descending,
 957# make sure no implicit rule kicks in
 958$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 959
 960# Handle descending into subdirectories listed in $(vmlinux-dirs)
 961# Preset locale variables to speed up the build process. Limit locale
 962# tweaks to this spot to avoid wrong language settings when running
 963# make menuconfig etc.
 964# Error messages still appears in the original language
 965
 966PHONY += $(vmlinux-dirs)
 967$(vmlinux-dirs): prepare scripts
 968        $(Q)$(MAKE) $(build)=$@
 969
 970define filechk_kernel.release
 971        echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 972endef
 973
 974# Store (new) KERNELRELEASE string in include/config/kernel.release
 975include/config/kernel.release: include/config/auto.conf FORCE
 976        $(call filechk,kernel.release)
 977
 978
 979# Things we need to do before we recursively start building the kernel
 980# or the modules are listed in "prepare".
 981# A multi level approach is used. prepareN is processed before prepareN-1.
 982# archprepare is used in arch Makefiles and when processed asm symlink,
 983# version.h and scripts_basic is processed / created.
 984
 985# Listed in dependency order
 986PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 987
 988# prepare3 is used to check if we are building in a separate output directory,
 989# and if so do:
 990# 1) Check that make has not been executed in the kernel src $(srctree)
 991prepare3: include/config/kernel.release
 992ifneq ($(KBUILD_SRC),)
 993        @$(kecho) '  Using $(srctree) as source for kernel'
 994        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 995                echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 996                echo >&2 "  in the '$(srctree)' directory.";\
 997                /bin/false; \
 998        fi;
 999endif
1000
1001# prepare2 creates a makefile if using a separate output directory.
1002# From this point forward, .config has been reprocessed, so any rules
1003# that need to depend on updated CONFIG_* values can be checked here.
1004prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1005
1006prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1007                   include/config/auto.conf
1008        $(cmd_crmodverdir)
1009        $(Q)test -e include/generated/autoksyms.h || \
1010            touch   include/generated/autoksyms.h
1011
1012archprepare: archheaders archscripts prepare1 scripts_basic
1013
1014prepare0: archprepare gcc-plugins
1015        $(Q)$(MAKE) $(build)=.
1016
1017# All the preparing..
1018prepare: prepare0 prepare-objtool
1019
1020ifdef CONFIG_STACK_VALIDATION
1021  has_libelf := $(call try-run,\
1022                echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1023  ifeq ($(has_libelf),1)
1024    objtool_target := tools/objtool FORCE
1025  else
1026    $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1027    SKIP_STACK_VALIDATION := 1
1028    export SKIP_STACK_VALIDATION
1029  endif
1030endif
1031
1032PHONY += prepare-objtool
1033prepare-objtool: $(objtool_target)
1034
1035# Check for CONFIG flags that require compiler support. Abort the build
1036# after .config has been processed, but before the kernel build starts.
1037#
1038# For security-sensitive CONFIG options, we don't want to fallback and/or
1039# silently change which compiler flags will be used, since that leads to
1040# producing kernels with different security feature characteristics
1041# depending on the compiler used. (For example, "But I selected
1042# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1043PHONY += prepare-compiler-check
1044prepare-compiler-check: FORCE
1045# Make sure compiler supports requested stack protector flag.
1046ifdef stackp-name
1047  ifeq ($(call cc-option, $(stackp-flag)),)
1048        @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1049                  $(stackp-flag) not supported by compiler >&2 && exit 1
1050  endif
1051endif
1052# Make sure compiler does not have buggy stack-protector support.
1053ifdef stackp-check
1054  ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1055        @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1056                  $(stackp-flag) available but compiler is broken >&2 && exit 1
1057  endif
1058endif
1059        @:
1060
1061# Generate some files
1062# ---------------------------------------------------------------------------
1063
1064# KERNELRELEASE can change from a few different places, meaning version.h
1065# needs to be updated, so this check is forced on all builds
1066
1067uts_len := 64
1068define filechk_utsrelease.h
1069        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1070          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1071          exit 1;                                                         \
1072        fi;                                                               \
1073        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1074endef
1075
1076define filechk_version.h
1077        (echo \#define LINUX_VERSION_CODE $(shell                         \
1078        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1079        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1080endef
1081
1082$(version_h): $(srctree)/Makefile FORCE
1083        $(call filechk,version.h)
1084        $(Q)rm -f $(old_version_h)
1085
1086include/generated/utsrelease.h: include/config/kernel.release FORCE
1087        $(call filechk,utsrelease.h)
1088
1089PHONY += headerdep
1090headerdep:
1091        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1092        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1093
1094# ---------------------------------------------------------------------------
1095# Firmware install
1096INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1097export INSTALL_FW_PATH
1098
1099PHONY += firmware_install
1100firmware_install:
1101        @mkdir -p $(objtree)/firmware
1102        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1103
1104# ---------------------------------------------------------------------------
1105# Kernel headers
1106
1107#Default location for installed headers
1108export INSTALL_HDR_PATH = $(objtree)/usr
1109
1110# If we do an all arch process set dst to asm-$(hdr-arch)
1111hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1112
1113PHONY += archheaders
1114archheaders:
1115
1116PHONY += archscripts
1117archscripts:
1118
1119PHONY += __headers
1120__headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1121        $(Q)$(MAKE) $(build)=scripts build_unifdef
1122
1123PHONY += headers_install_all
1124headers_install_all:
1125        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1126
1127PHONY += headers_install
1128headers_install: __headers
1129        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1130          $(error Headers not exportable for the $(SRCARCH) architecture))
1131        $(Q)$(MAKE) $(hdr-inst)=include/uapi
1132        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1133
1134PHONY += headers_check_all
1135headers_check_all: headers_install_all
1136        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1137
1138PHONY += headers_check
1139headers_check: headers_install
1140        $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1141        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1142
1143# ---------------------------------------------------------------------------
1144# Kernel selftest
1145
1146PHONY += kselftest
1147kselftest:
1148        $(Q)$(MAKE) -C tools/testing/selftests run_tests
1149
1150kselftest-clean:
1151        $(Q)$(MAKE) -C tools/testing/selftests clean
1152
1153PHONY += kselftest-merge
1154kselftest-merge:
1155        $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1156        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1157                -m $(objtree)/.config \
1158                $(srctree)/tools/testing/selftests/*/config
1159        +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1160
1161# ---------------------------------------------------------------------------
1162# Modules
1163
1164ifdef CONFIG_MODULES
1165
1166# By default, build modules as well
1167
1168all: modules
1169
1170# Build modules
1171#
1172# A module can be listed more than once in obj-m resulting in
1173# duplicate lines in modules.order files.  Those are removed
1174# using awk while concatenating to the final file.
1175
1176PHONY += modules
1177modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1178        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1179        @$(kecho) '  Building modules, stage 2.';
1180        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1181        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1182
1183modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1184        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1185
1186%/modules.builtin: include/config/auto.conf
1187        $(Q)$(MAKE) $(modbuiltin)=$*
1188
1189
1190# Target to prepare building external modules
1191PHONY += modules_prepare
1192modules_prepare: prepare scripts
1193
1194# Target to install modules
1195PHONY += modules_install
1196modules_install: _modinst_ _modinst_post
1197
1198PHONY += _modinst_
1199_modinst_:
1200        @rm -rf $(MODLIB)/kernel
1201        @rm -f $(MODLIB)/source
1202        @mkdir -p $(MODLIB)/kernel
1203        @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1204        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1205                rm -f $(MODLIB)/build ; \
1206                ln -s $(CURDIR) $(MODLIB)/build ; \
1207        fi
1208        @cp -f $(objtree)/modules.order $(MODLIB)/
1209        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1210        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1211
1212# This depmod is only for convenience to give the initial
1213# boot a modules.dep even before / is mounted read-write.  However the
1214# boot script depmod is the master version.
1215PHONY += _modinst_post
1216_modinst_post: _modinst_
1217        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1218        $(call cmd,depmod)
1219
1220ifeq ($(CONFIG_MODULE_SIG), y)
1221PHONY += modules_sign
1222modules_sign:
1223        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1224endif
1225
1226else # CONFIG_MODULES
1227
1228# Modules not configured
1229# ---------------------------------------------------------------------------
1230
1231PHONY += modules modules_install
1232modules modules_install:
1233        @echo >&2
1234        @echo >&2 "The present kernel configuration has modules disabled."
1235        @echo >&2 "Type 'make config' and enable loadable module support."
1236        @echo >&2 "Then build a kernel with module support enabled."
1237        @echo >&2
1238        @exit 1
1239
1240endif # CONFIG_MODULES
1241
1242###
1243# Cleaning is done on three levels.
1244# make clean     Delete most generated files
1245#                Leave enough to build external modules
1246# make mrproper  Delete the current configuration, and all generated files
1247# make distclean Remove editor backup files, patch leftover files and the like
1248
1249# Directories & files removed with 'make clean'
1250CLEAN_DIRS  += $(MODVERDIR)
1251
1252# Directories & files removed with 'make mrproper'
1253MRPROPER_DIRS  += include/config usr/include include/generated          \
1254                  arch/*/include/generated .tmp_objdiff
1255MRPROPER_FILES += .config .config.old .version .old_version \
1256                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1257                  signing_key.pem signing_key.priv signing_key.x509     \
1258                  x509.genkey extra_certificates signing_key.x509.keyid \
1259                  signing_key.x509.signer vmlinux-gdb.py
1260
1261# clean - Delete most, but leave enough to build external modules
1262#
1263clean: rm-dirs  := $(CLEAN_DIRS)
1264clean: rm-files := $(CLEAN_FILES)
1265clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1266
1267PHONY += $(clean-dirs) clean archclean vmlinuxclean
1268$(clean-dirs):
1269        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1270
1271vmlinuxclean:
1272        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1273
1274clean: archclean vmlinuxclean
1275
1276# mrproper - Delete all generated files, including .config
1277#
1278mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1279mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1280mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1281
1282PHONY += $(mrproper-dirs) mrproper archmrproper
1283$(mrproper-dirs):
1284        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1285
1286mrproper: clean archmrproper $(mrproper-dirs)
1287        $(call cmd,rmdirs)
1288        $(call cmd,rmfiles)
1289
1290# distclean
1291#
1292PHONY += distclean
1293
1294distclean: mrproper
1295        @find $(srctree) $(RCS_FIND_IGNORE) \
1296                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1297                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1298                -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1299                -type f -print | xargs rm -f
1300
1301
1302# Packaging of the kernel to various formats
1303# ---------------------------------------------------------------------------
1304# rpm target kept for backward compatibility
1305package-dir     := scripts/package
1306
1307%src-pkg: FORCE
1308        $(Q)$(MAKE) $(build)=$(package-dir) $@
1309%pkg: include/config/kernel.release FORCE
1310        $(Q)$(MAKE) $(build)=$(package-dir) $@
1311rpm: include/config/kernel.release FORCE
1312        $(Q)$(MAKE) $(build)=$(package-dir) $@
1313
1314
1315# Brief documentation of the typical targets used
1316# ---------------------------------------------------------------------------
1317
1318boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1319boards := $(sort $(notdir $(boards)))
1320board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1321board-dirs := $(sort $(notdir $(board-dirs:/=)))
1322
1323PHONY += help
1324help:
1325        @echo  'Cleaning targets:'
1326        @echo  '  clean           - Remove most generated files but keep the config and'
1327        @echo  '                    enough build support to build external modules'
1328        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1329        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1330        @echo  ''
1331        @echo  'Configuration targets:'
1332        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1333        @echo  ''
1334        @echo  'Other generic targets:'
1335        @echo  '  all             - Build all targets marked with [*]'
1336        @echo  '* vmlinux         - Build the bare kernel'
1337        @echo  '* modules         - Build all modules'
1338        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1339        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1340        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1341        @echo  '  dir/            - Build all files in dir and below'
1342        @echo  '  dir/file.[ois]  - Build specified target only'
1343        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1344        @echo  '                    (requires a recent binutils and recent build (System.map))'
1345        @echo  '  dir/file.ko     - Build module including final link'
1346        @echo  '  modules_prepare - Set up for building external modules'
1347        @echo  '  tags/TAGS       - Generate tags file for editors'
1348        @echo  '  cscope          - Generate cscope index'
1349        @echo  '  gtags           - Generate GNU GLOBAL index'
1350        @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1351        @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1352        @echo  '  image_name      - Output the image name (use with make -s)'
1353        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1354         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1355         echo  ''
1356        @echo  'Static analysers'
1357        @echo  '  checkstack      - Generate a list of stack hogs'
1358        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1359        @echo  '  versioncheck    - Sanity check on version.h usage'
1360        @echo  '  includecheck    - Check for duplicate included header files'
1361        @echo  '  export_report   - List the usages of all exported symbols'
1362        @echo  '  headers_check   - Sanity check on exported headers'
1363        @echo  '  headerdep       - Detect inclusion cycles in headers'
1364        @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1365        @echo  ''
1366        @echo  'Kernel selftest'
1367        @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1368        @echo  '                    Build, install, and boot kernel before'
1369        @echo  '                    running kselftest on it'
1370        @echo  '  kselftest-clean - Remove all generated kselftest files'
1371        @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1372        @echo  '                    .config.'
1373        @echo  ''
1374        @echo  'Kernel packaging:'
1375        @$(MAKE) $(build)=$(package-dir) help
1376        @echo  ''
1377        @echo  'Documentation targets:'
1378        @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1379        @echo  ''
1380        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1381        @echo  ''
1382        @echo  'Architecture specific targets ($(SRCARCH)):'
1383        @$(if $(archhelp),$(archhelp),\
1384                echo '  No architecture specific help defined for $(SRCARCH)')
1385        @echo  ''
1386        @$(if $(boards), \
1387                $(foreach b, $(boards), \
1388                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1389                echo '')
1390        @$(if $(board-dirs), \
1391                $(foreach b, $(board-dirs), \
1392                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1393                printf "  %-16s - Show all of the above\\n" help-boards; \
1394                echo '')
1395
1396        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1397        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1398        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1399        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1400        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1401        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1402        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1403        @echo  '                1: warnings which may be relevant and do not occur too often'
1404        @echo  '                2: warnings which occur quite often but may still be relevant'
1405        @echo  '                3: more obscure warnings, can most likely be ignored'
1406        @echo  '                Multiple levels can be combined with W=12 or W=123'
1407        @echo  ''
1408        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1409        @echo  'For further info see the ./README file'
1410
1411
1412help-board-dirs := $(addprefix help-,$(board-dirs))
1413
1414help-boards: $(help-board-dirs)
1415
1416boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1417
1418$(help-board-dirs): help-%:
1419        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1420        @$(if $(boards-per-dir), \
1421                $(foreach b, $(boards-per-dir), \
1422                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1423                echo '')
1424
1425
1426# Documentation targets
1427# ---------------------------------------------------------------------------
1428DOC_TARGETS := xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1429PHONY += $(DOC_TARGETS)
1430$(DOC_TARGETS): scripts_basic FORCE
1431        $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1432        $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1433        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1434
1435else # KBUILD_EXTMOD
1436
1437###
1438# External module support.
1439# When building external modules the kernel used as basis is considered
1440# read-only, and no consistency checks are made and the make
1441# system is not used on the basis kernel. If updates are required
1442# in the basis kernel ordinary make commands (without M=...) must
1443# be used.
1444#
1445# The following are the only valid targets when building external
1446# modules.
1447# make M=dir clean     Delete all automatically generated files
1448# make M=dir modules   Make all modules in specified dir
1449# make M=dir           Same as 'make M=dir modules'
1450# make M=dir modules_install
1451#                      Install the modules built in the module directory
1452#                      Assumes install directory is already created
1453
1454# We are always building modules
1455KBUILD_MODULES := 1
1456PHONY += crmodverdir
1457crmodverdir:
1458        $(cmd_crmodverdir)
1459
1460PHONY += $(objtree)/Module.symvers
1461$(objtree)/Module.symvers:
1462        @test -e $(objtree)/Module.symvers || ( \
1463        echo; \
1464        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1465        echo "           is missing; modules will have no dependencies and modversions."; \
1466        echo )
1467
1468module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1469PHONY += $(module-dirs) modules
1470$(module-dirs): crmodverdir $(objtree)/Module.symvers
1471        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1472
1473modules: $(module-dirs)
1474        @$(kecho) '  Building modules, stage 2.';
1475        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1476
1477PHONY += modules_install
1478modules_install: _emodinst_ _emodinst_post
1479
1480install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1481PHONY += _emodinst_
1482_emodinst_:
1483        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1484        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1485
1486PHONY += _emodinst_post
1487_emodinst_post: _emodinst_
1488        $(call cmd,depmod)
1489
1490clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1491
1492PHONY += $(clean-dirs) clean
1493$(clean-dirs):
1494        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1495
1496clean:  rm-dirs := $(MODVERDIR)
1497clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1498
1499PHONY += help
1500help:
1501        @echo  '  Building external modules.'
1502        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1503        @echo  ''
1504        @echo  '  modules         - default target, build the module(s)'
1505        @echo  '  modules_install - install the module'
1506        @echo  '  clean           - remove generated files in module directory only'
1507        @echo  ''
1508
1509# Dummies...
1510PHONY += prepare scripts
1511prepare: ;
1512scripts: ;
1513endif # KBUILD_EXTMOD
1514
1515clean: $(clean-dirs)
1516        $(call cmd,rmdirs)
1517        $(call cmd,rmfiles)
1518        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1519                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1520                -o -name '*.ko.*' \
1521                -o -name '*.dwo'  \
1522                -o -name '*.su'  \
1523                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1524                -o -name '*.symtypes' -o -name 'modules.order' \
1525                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1526                -o -name '*.c.[012]*.*' \
1527                -o -name '*.gcno' \) -type f -print | xargs rm -f
1528
1529# Generate tags for editors
1530# ---------------------------------------------------------------------------
1531quiet_cmd_tags = GEN     $@
1532      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1533
1534tags TAGS cscope gtags: FORCE
1535        $(call cmd,tags)
1536
1537# Scripts to check various things for consistency
1538# ---------------------------------------------------------------------------
1539
1540PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1541
1542includecheck:
1543        find $(srctree)/* $(RCS_FIND_IGNORE) \
1544                -name '*.[hcS]' -type f -print | sort \
1545                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1546
1547versioncheck:
1548        find $(srctree)/* $(RCS_FIND_IGNORE) \
1549                -name '*.[hcS]' -type f -print | sort \
1550                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1551
1552coccicheck:
1553        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1554
1555namespacecheck:
1556        $(PERL) $(srctree)/scripts/namespace.pl
1557
1558export_report:
1559        $(PERL) $(srctree)/scripts/export_report.pl
1560
1561endif #ifeq ($(config-targets),1)
1562endif #ifeq ($(mixed-targets),1)
1563
1564PHONY += checkstack kernelrelease kernelversion image_name
1565
1566# UML needs a little special treatment here.  It wants to use the host
1567# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1568# else wants $(ARCH), including people doing cross-builds, which means
1569# that $(SUBARCH) doesn't work here.
1570ifeq ($(ARCH), um)
1571CHECKSTACK_ARCH := $(SUBARCH)
1572else
1573CHECKSTACK_ARCH := $(ARCH)
1574endif
1575checkstack:
1576        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1577        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1578
1579kernelrelease:
1580        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1581
1582kernelversion:
1583        @echo $(KERNELVERSION)
1584
1585image_name:
1586        @echo $(KBUILD_IMAGE)
1587
1588# Clear a bunch of variables before executing the submake
1589tools/: FORCE
1590        $(Q)mkdir -p $(objtree)/tools
1591        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1592
1593tools/%: FORCE
1594        $(Q)mkdir -p $(objtree)/tools
1595        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1596
1597# Single targets
1598# ---------------------------------------------------------------------------
1599# Single targets are compatible with:
1600# - build with mixed source and output
1601# - build with separate output dir 'make O=...'
1602# - external modules
1603#
1604#  target-dir => where to store outputfile
1605#  build-dir  => directory in kernel source tree to use
1606
1607ifeq ($(KBUILD_EXTMOD),)
1608        build-dir  = $(patsubst %/,%,$(dir $@))
1609        target-dir = $(dir $@)
1610else
1611        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1612        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1613        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1614endif
1615
1616%.s: %.c prepare scripts FORCE
1617        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1618%.i: %.c prepare scripts FORCE
1619        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1620%.o: %.c prepare scripts FORCE
1621        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1622%.lst: %.c prepare scripts FORCE
1623        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1624%.s: %.S prepare scripts FORCE
1625        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1626%.o: %.S prepare scripts FORCE
1627        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1628%.symtypes: %.c prepare scripts FORCE
1629        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1630
1631# Modules
1632/: prepare scripts FORCE
1633        $(cmd_crmodverdir)
1634        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1635        $(build)=$(build-dir)
1636# Make sure the latest headers are built for Documentation
1637Documentation/ samples/: headers_install
1638%/: prepare scripts FORCE
1639        $(cmd_crmodverdir)
1640        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1641        $(build)=$(build-dir)
1642%.ko: prepare scripts FORCE
1643        $(cmd_crmodverdir)
1644        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1645        $(build)=$(build-dir) $(@:.ko=.o)
1646        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1647
1648# FIXME Should go into a make.lib or something
1649# ===========================================================================
1650
1651quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1652      cmd_rmdirs = rm -rf $(rm-dirs)
1653
1654quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1655      cmd_rmfiles = rm -f $(rm-files)
1656
1657# Run depmod only if we have System.map and depmod is executable
1658quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1659      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1660                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1661
1662# Create temporary dir for module support files
1663# clean it up only when building all modules
1664cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1665                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1666
1667# read all saved command lines
1668
1669targets := $(wildcard $(sort $(targets)))
1670cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1671
1672ifneq ($(cmd_files),)
1673  $(cmd_files): ;       # Do not try to update included dependency files
1674  include $(cmd_files)
1675endif
1676
1677endif   # skip-makefile
1678
1679PHONY += FORCE
1680FORCE:
1681
1682# Declare the contents of the .PHONY variable as phony.  We keep that
1683# information in a variable so we can use it in if_changed and friends.
1684.PHONY: $(PHONY)
1685