Makefile

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