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