Makefile

   1 VERSION = 3
   2 PATCHLEVEL = 18
   3 SUBLEVEL = 0
   4 EXTRAVERSION = -rc3
   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
 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 $(CF)
 374 CFLAGS_MODULE   =
 375 AFLAGS_MODULE   =
 376 LDFLAGS_MODULE  =
 377 CFLAGS_KERNEL   =
 378 AFLAGS_KERNEL   =
 379 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 380
 381
 382 # Use USERINCLUDE when you must reference the UAPI directories only.
 383 USERINCLUDE    := \
 384                 -I$(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
 406 KBUILD_AFLAGS_KERNEL :=
 407 KBUILD_CFLAGS_KERNEL :=
 408 KBUILD_AFLAGS   := -D__ASSEMBLY__
 409 KBUILD_AFLAGS_MODULE  := -DMODULE
 410 KBUILD_CFLAGS_MODULE  := -DMODULE
 411 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 412
 413 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 414 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 415 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 416
 417 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 418 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 419 export CPP AR NM STRIP OBJCOPY OBJDUMP
 420 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 421 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 422
 423 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 424 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 425 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 426 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 427 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 428 export 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.
 433 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 434
 435 # Files to ignore in find ... statements
 436
 437 export 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
 440 export 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/
 447 PHONY += scripts_basic
 448 scripts_basic:
 449         $(Q)$(MAKE) $(build)=scripts/basic
 450         $(Q)rm -f .tmp_quiet_recordmcount
 451
 452 # To avoid any implicit rule to kick in, define an empty command.
 453 scripts/basic/%: scripts_basic ;
 454
 455 PHONY += outputmakefile
 456 # outputmakefile generates a Makefile in the output directory, if using a
 457 # separate output directory. This allows convenient use of make in the
 458 # output directory.
 459 outputmakefile:
 460 ifneq ($(KBUILD_SRC),)
 461         $(Q)ln -fsn $(srctree) source
 462         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 463             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 464 endif
 465
 466 # Support for using generic headers in asm-generic
 467 PHONY += asm-generic
 468 asm-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
 482 version_h := include/generated/uapi/linux/version.h
 483
 484 no-dot-config-targets := clean mrproper distclean \
 485                          cscope gtags TAGS tags help %docs check% coccicheck \
 486                          $(version_h) headers_% archheaders archscripts \
 487                          kernelversion %src-pkg
 488
 489 config-targets := 0
 490 mixed-targets  := 0
 491 dot-config     := 1
 492
 493 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 494         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 495                 dot-config := 0
 496         endif
 497 endif
 498
 499 ifeq ($(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
 506 endif
 507
 508 ifeq ($(mixed-targets),1)
 509 # ===========================================================================
 510 # We're called with mixed targets (*config and build targets).
 511 # Handle them one by one.
 512
 513 PHONY += $(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
 524 else
 525 ifeq ($(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'
 533 include $(srctree)/arch/$(SRCARCH)/Makefile
 534 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 535
 536 config: scripts_basic outputmakefile FORCE
 537         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 538
 539 %config: scripts_basic outputmakefile FORCE
 540         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 541
 542 else
 543 # ===========================================================================
 544 # Build targets only - this includes vmlinux, arch specific targets, clean
 545 # targets and others. In general all targets except *config targets.
 546
 547 ifeq ($(KBUILD_EXTMOD),)
 548 # Additional helpers built in scripts/
 549 # Carefully list dependencies so we do not try to build scripts twice
 550 # in parallel
 551 PHONY += scripts
 552 scripts: 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
 557 init-y          := init/
 558 drivers-y       := drivers/ sound/ firmware/
 559 net-y           := net/
 560 libs-y          := lib/
 561 core-y          := usr/
 562 endif # KBUILD_EXTMOD
 563
 564 ifeq ($(dot-config),1)
 565 # Read in config
 566 -include include/config/auto.conf
 567
 568 ifeq ($(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
 580 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 581         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 582 else
 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
 585 PHONY += include/config/auto.conf
 586
 587 include/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
 596 endif # KBUILD_EXTMOD
 597
 598 else
 599 # Dummy target needed, because used as prerequisite
 600 include/config/auto.conf: ;
 601 endif # $(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
 607 all: vmlinux
 608
 609 include $(srctree)/arch/$(SRCARCH)/Makefile
 610
 611 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 612
 613 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 614 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 615 else
 616 KBUILD_CFLAGS   += -O2
 617 endif
 618
 619 # Tell gcc to never replace conditional load with a non-conditional one
 620 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 621
 622 ifdef CONFIG_READABLE_ASM
 623 # Disable optimizations that make assembler listings hard to read.
 624 # reorder blocks reorders the control in the function
 625 # ipa clone creates specialized cloned functions
 626 # partial inlining inlines only parts of functions
 627 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 628                  $(call cc-option,-fno-ipa-cp-clone,) \
 629                  $(call cc-option,-fno-partial-inlining)
 630 endif
 631
 632 ifneq ($(CONFIG_FRAME_WARN),0)
 633 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 634 endif
 635
 636 # Handle stack protector mode.
 637 #
 638 # Since kbuild can potentially perform two passes (first with the old
 639 # .config values and then with updated .config values), we cannot error out
 640 # if a desired compiler option is unsupported. If we were to error, kbuild
 641 # could never get to the second pass and actually notice that we changed
 642 # the option to something that was supported.
 643 #
 644 # Additionally, we don't want to fallback and/or silently change which compiler
 645 # flags will be used, since that leads to producing kernels with different
 646 # security feature characteristics depending on the compiler used. ("But I
 647 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
 648 #
 649 # The middle ground is to warn here so that the failed option is obvious, but
 650 # to let the build fail with bad compiler flags so that we can't produce a
 651 # kernel when there is a CONFIG and compiler mismatch.
 652 #
 653 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 654   stackp-flag := -fstack-protector
 655   ifeq ($(call cc-option, $(stackp-flag)),)
 656     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
 657              -fstack-protector not supported by compiler)
 658   endif
 659 else
 660 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 661   stackp-flag := -fstack-protector-strong
 662   ifeq ($(call cc-option, $(stackp-flag)),)
 663     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 664               -fstack-protector-strong not supported by compiler)
 665   endif
 666 else
 667   # Force off for distro compilers that enable stack protector by default.
 668   stackp-flag := $(call cc-option, -fno-stack-protector)
 669 endif
 670 endif
 671 KBUILD_CFLAGS += $(stackp-flag)
 672
 673 ifeq ($(COMPILER),clang)
 674 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 675 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 676 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 677 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 678 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 679 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 680 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 681 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 682 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 683 # See modpost pattern 2
 684 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 685 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 686 else
 687
 688 # This warning generated too much noise in a regular build.
 689 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 690 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 691 endif
 692
 693 ifdef CONFIG_FRAME_POINTER
 694 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 695 else
 696 # Some targets (ARM with Thumb2, for example), can't be built with frame
 697 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 698 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 699 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 700 # -fomit-frame-pointer with FUNCTION_TRACER.
 701 ifndef CONFIG_FUNCTION_TRACER
 702 KBUILD_CFLAGS   += -fomit-frame-pointer
 703 endif
 704 endif
 705
 706 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 707
 708 ifdef CONFIG_DEBUG_INFO
 709 ifdef CONFIG_DEBUG_INFO_SPLIT
 710 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 711 else
 712 KBUILD_CFLAGS   += -g
 713 endif
 714 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 715 endif
 716 ifdef CONFIG_DEBUG_INFO_DWARF4
 717 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 718 endif
 719
 720 ifdef CONFIG_DEBUG_INFO_REDUCED
 721 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 722                    $(call cc-option,-fno-var-tracking)
 723 endif
 724
 725 ifdef CONFIG_FUNCTION_TRACER
 726 ifdef CONFIG_HAVE_FENTRY
 727 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 728 endif
 729 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
 730 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 731 ifdef CONFIG_DYNAMIC_FTRACE
 732         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 733                 BUILD_C_RECORDMCOUNT := y
 734                 export BUILD_C_RECORDMCOUNT
 735         endif
 736 endif
 737 endif
 738
 739 # We trigger additional mismatches with less inlining
 740 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 741 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 742 endif
 743
 744 # arch Makefile may override CC so keep this after arch Makefile is included
 745 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 746 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 747
 748 # warn about C99 declaration after statement
 749 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 750
 751 # disable pointer signed / unsigned warnings in gcc 4.0
 752 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 753
 754 # disable invalid "can't wrap" optimizations for signed / pointers
 755 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 756
 757 # conserve stack if available
 758 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 759
 760 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 761 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 762
 763 # require functions to have arguments in prototypes, not empty 'int foo()'
 764 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 765
 766 # Prohibit date/time macros, which would make the build non-deterministic
 767 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 768
 769 # use the deterministic mode of AR if available
 770 KBUILD_ARFLAGS := $(call ar-option,D)
 771
 772 # check for 'asm goto'
 773 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 774         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 775 endif
 776
 777 include $(srctree)/scripts/Makefile.extrawarn
 778
 779 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 780 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 781 KBUILD_AFLAGS += $(KAFLAGS)
 782 KBUILD_CFLAGS += $(KCFLAGS)
 783
 784 # Use --build-id when available.
 785 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 786                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 787 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 788 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 789
 790 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 791 LDFLAGS_vmlinux += $(call ld-option, -X,)
 792 endif
 793
 794 # Default kernel image to build when no specific target is given.
 795 # KBUILD_IMAGE may be overruled on the command line or
 796 # set in the environment
 797 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 798 # this default value
 799 export KBUILD_IMAGE ?= vmlinux
 800
 801 #
 802 # INSTALL_PATH specifies where to place the updated kernel and system map
 803 # images. Default is /boot, but you can set it to other values
 804 export  INSTALL_PATH ?= /boot
 805
 806 #
 807 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 808 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 809 # an argument if needed. Otherwise it defaults to the kernel install path
 810 #
 811 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 812
 813 #
 814 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 815 # relocations required by build roots.  This is not defined in the
 816 # makefile but the argument can be passed to make if needed.
 817 #
 818
 819 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 820 export MODLIB
 821
 822 #
 823 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 824 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 825 # the default option --strip-debug will be used.  Otherwise,
 826 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 827
 828 ifdef INSTALL_MOD_STRIP
 829 ifeq ($(INSTALL_MOD_STRIP),1)
 830 mod_strip_cmd = $(STRIP) --strip-debug
 831 else
 832 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 833 endif # INSTALL_MOD_STRIP=1
 834 else
 835 mod_strip_cmd = true
 836 endif # INSTALL_MOD_STRIP
 837 export mod_strip_cmd
 838
 839 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 840 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 841 # or CONFIG_MODULE_COMPRESS_XZ.
 842
 843 mod_compress_cmd = true
 844 ifdef CONFIG_MODULE_COMPRESS
 845   ifdef CONFIG_MODULE_COMPRESS_GZIP
 846     mod_compress_cmd = gzip -n
 847   endif # CONFIG_MODULE_COMPRESS_GZIP
 848   ifdef CONFIG_MODULE_COMPRESS_XZ
 849     mod_compress_cmd = xz
 850   endif # CONFIG_MODULE_COMPRESS_XZ
 851 endif # CONFIG_MODULE_COMPRESS
 852 export mod_compress_cmd
 853
 854 # Select initial ramdisk compression format, default is gzip(1).
 855 # This shall be used by the dracut(8) tool while creating an initramfs image.
 856 #
 857 INITRD_COMPRESS-y                  := gzip
 858 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 859 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 860 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 861 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 862 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 863 # do not export INITRD_COMPRESS, since we didn't actually
 864 # choose a sane default compression above.
 865 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 866
 867 ifdef CONFIG_MODULE_SIG_ALL
 868 MODSECKEY = ./signing_key.priv
 869 MODPUBKEY = ./signing_key.x509
 870 export MODPUBKEY
 871 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
 872 else
 873 mod_sign_cmd = true
 874 endif
 875 export mod_sign_cmd
 876
 877
 878 ifeq ($(KBUILD_EXTMOD),)
 879 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 880
 881 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 882                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 883                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 884
 885 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 886                      $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
 887
 888 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 889 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 890 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 891 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 892 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 893 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 894 libs-y          := $(libs-y1) $(libs-y2)
 895
 896 # Externally visible symbols (used by link-vmlinux.sh)
 897 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 898 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 899 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 900 export LDFLAGS_vmlinux
 901 # used by scripts/pacmage/Makefile
 902 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
 903
 904 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 905
 906 # Final link of vmlinux
 907       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 908 quiet_cmd_link-vmlinux = LINK    $@
 909
 910 # Include targets which we want to
 911 # execute if the rest of the kernel build went well.
 912 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 913 ifdef CONFIG_HEADERS_CHECK
 914         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 915 endif
 916 ifdef CONFIG_SAMPLES
 917         $(Q)$(MAKE) $(build)=samples
 918 endif
 919 ifdef CONFIG_BUILD_DOCSRC
 920         $(Q)$(MAKE) $(build)=Documentation
 921 endif
 922         +$(call if_changed,link-vmlinux)
 923
 924 # The actual objects are generated when descending,
 925 # make sure no implicit rule kicks in
 926 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 927
 928 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 929 # Preset locale variables to speed up the build process. Limit locale
 930 # tweaks to this spot to avoid wrong language settings when running
 931 # make menuconfig etc.
 932 # Error messages still appears in the original language
 933
 934 PHONY += $(vmlinux-dirs)
 935 $(vmlinux-dirs): prepare scripts
 936         $(Q)$(MAKE) $(build)=$@
 937
 938 define filechk_kernel.release
 939         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 940 endef
 941
 942 # Store (new) KERNELRELEASE string in include/config/kernel.release
 943 include/config/kernel.release: include/config/auto.conf FORCE
 944         $(call filechk,kernel.release)
 945
 946
 947 # Things we need to do before we recursively start building the kernel
 948 # or the modules are listed in "prepare".
 949 # A multi level approach is used. prepareN is processed before prepareN-1.
 950 # archprepare is used in arch Makefiles and when processed asm symlink,
 951 # version.h and scripts_basic is processed / created.
 952
 953 # Listed in dependency order
 954 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 955
 956 # prepare3 is used to check if we are building in a separate output directory,
 957 # and if so do:
 958 # 1) Check that make has not been executed in the kernel src $(srctree)
 959 prepare3: include/config/kernel.release
 960 ifneq ($(KBUILD_SRC),)
 961         @$(kecho) '  Using $(srctree) as source for kernel'
 962         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 963                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 964                 echo >&2 "  in the '$(srctree)' directory.";\
 965                 /bin/false; \
 966         fi;
 967 endif
 968
 969 # prepare2 creates a makefile if using a separate output directory
 970 prepare2: prepare3 outputmakefile asm-generic
 971
 972 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 973                    include/config/auto.conf
 974         $(cmd_crmodverdir)
 975
 976 archprepare: archheaders archscripts prepare1 scripts_basic
 977
 978 prepare0: archprepare FORCE
 979         $(Q)$(MAKE) $(build)=.
 980
 981 # All the preparing..
 982 prepare: prepare0
 983
 984 # Generate some files
 985 # ---------------------------------------------------------------------------
 986
 987 # KERNELRELEASE can change from a few different places, meaning version.h
 988 # needs to be updated, so this check is forced on all builds
 989
 990 uts_len := 64
 991 define filechk_utsrelease.h
 992         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 993           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 994           exit 1;                                                         \
 995         fi;                                                               \
 996         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 997 endef
 998
 999 define filechk_version.h
1000         (echo \#define LINUX_VERSION_CODE $(shell                         \
1001         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1002         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1003 endef
1004
1005 $(version_h): $(srctree)/Makefile FORCE
1006         $(call filechk,version.h)
1007
1008 include/generated/utsrelease.h: include/config/kernel.release FORCE
1009         $(call filechk,utsrelease.h)
1010
1011 PHONY += headerdep
1012 headerdep:
1013         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1014         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1015
1016 # ---------------------------------------------------------------------------
1017
1018 PHONY += depend dep
1019 depend dep:
1020         @echo '*** Warning: make $@ is unnecessary now.'
1021
1022 # ---------------------------------------------------------------------------
1023 # Firmware install
1024 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1025 export INSTALL_FW_PATH
1026
1027 PHONY += firmware_install
1028 firmware_install: FORCE
1029         @mkdir -p $(objtree)/firmware
1030         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1031
1032 # ---------------------------------------------------------------------------
1033 # Kernel headers
1034
1035 #Default location for installed headers
1036 export INSTALL_HDR_PATH = $(objtree)/usr
1037
1038 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1039
1040 # If we do an all arch process set dst to asm-$(hdr-arch)
1041 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1042
1043 PHONY += archheaders
1044 archheaders:
1045
1046 PHONY += archscripts
1047 archscripts:
1048
1049 PHONY += __headers
1050 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1051         $(Q)$(MAKE) $(build)=scripts build_unifdef
1052
1053 PHONY += headers_install_all
1054 headers_install_all:
1055         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1056
1057 PHONY += headers_install
1058 headers_install: __headers
1059         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1060           $(error Headers not exportable for the $(SRCARCH) architecture))
1061         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1062         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1063
1064 PHONY += headers_check_all
1065 headers_check_all: headers_install_all
1066         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1067
1068 PHONY += headers_check
1069 headers_check: headers_install
1070         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1071         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1072
1073 # ---------------------------------------------------------------------------
1074 # Kernel selftest
1075
1076 PHONY += kselftest
1077 kselftest:
1078         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1079
1080 # ---------------------------------------------------------------------------
1081 # Modules
1082
1083 ifdef CONFIG_MODULES
1084
1085 # By default, build modules as well
1086
1087 all: modules
1088
1089 # Build modules
1090 #
1091 # A module can be listed more than once in obj-m resulting in
1092 # duplicate lines in modules.order files.  Those are removed
1093 # using awk while concatenating to the final file.
1094
1095 PHONY += modules
1096 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1097         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1098         @$(kecho) '  Building modules, stage 2.';
1099         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1100         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1101
1102 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1103         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1104
1105 %/modules.builtin: include/config/auto.conf
1106         $(Q)$(MAKE) $(modbuiltin)=$*
1107
1108
1109 # Target to prepare building external modules
1110 PHONY += modules_prepare
1111 modules_prepare: prepare scripts
1112
1113 # Target to install modules
1114 PHONY += modules_install
1115 modules_install: _modinst_ _modinst_post
1116
1117 PHONY += _modinst_
1118 _modinst_:
1119         @rm -rf $(MODLIB)/kernel
1120         @rm -f $(MODLIB)/source
1121         @mkdir -p $(MODLIB)/kernel
1122         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1123         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1124                 rm -f $(MODLIB)/build ; \
1125                 ln -s $(CURDIR) $(MODLIB)/build ; \
1126         fi
1127         @cp -f $(objtree)/modules.order $(MODLIB)/
1128         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1129         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1130
1131 # This depmod is only for convenience to give the initial
1132 # boot a modules.dep even before / is mounted read-write.  However the
1133 # boot script depmod is the master version.
1134 PHONY += _modinst_post
1135 _modinst_post: _modinst_
1136         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1137         $(call cmd,depmod)
1138
1139 ifeq ($(CONFIG_MODULE_SIG), y)
1140 PHONY += modules_sign
1141 modules_sign:
1142         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1143 endif
1144
1145 else # CONFIG_MODULES
1146
1147 # Modules not configured
1148 # ---------------------------------------------------------------------------
1149
1150 modules modules_install: FORCE
1151         @echo >&2
1152         @echo >&2 "The present kernel configuration has modules disabled."
1153         @echo >&2 "Type 'make config' and enable loadable module support."
1154         @echo >&2 "Then build a kernel with module support enabled."
1155         @echo >&2
1156         @exit 1
1157
1158 endif # CONFIG_MODULES
1159
1160 ###
1161 # Cleaning is done on three levels.
1162 # make clean     Delete most generated files
1163 #                Leave enough to build external modules
1164 # make mrproper  Delete the current configuration, and all generated files
1165 # make distclean Remove editor backup files, patch leftover files and the like
1166
1167 # Directories & files removed with 'make clean'
1168 CLEAN_DIRS  += $(MODVERDIR)
1169
1170 # Directories & files removed with 'make mrproper'
1171 MRPROPER_DIRS  += include/config usr/include include/generated          \
1172                   arch/*/include/generated .tmp_objdiff
1173 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1174                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1175                   signing_key.priv signing_key.x509 x509.genkey         \
1176                   extra_certificates signing_key.x509.keyid             \
1177                   signing_key.x509.signer include/linux/version.h
1178
1179 # clean - Delete most, but leave enough to build external modules
1180 #
1181 clean: rm-dirs  := $(CLEAN_DIRS)
1182 clean: rm-files := $(CLEAN_FILES)
1183 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1184
1185 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1186 $(clean-dirs):
1187         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1188
1189 vmlinuxclean:
1190         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1191
1192 clean: archclean vmlinuxclean
1193
1194 # mrproper - Delete all generated files, including .config
1195 #
1196 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1197 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1198 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1199
1200 PHONY += $(mrproper-dirs) mrproper archmrproper
1201 $(mrproper-dirs):
1202         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1203
1204 mrproper: clean archmrproper $(mrproper-dirs)
1205         $(call cmd,rmdirs)
1206         $(call cmd,rmfiles)
1207
1208 # distclean
1209 #
1210 PHONY += distclean
1211
1212 distclean: mrproper
1213         @find $(srctree) $(RCS_FIND_IGNORE) \
1214                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1215                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1216                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1217                 -type f -print | xargs rm -f
1218
1219
1220 # Packaging of the kernel to various formats
1221 # ---------------------------------------------------------------------------
1222 # rpm target kept for backward compatibility
1223 package-dir     := scripts/package
1224
1225 %src-pkg: FORCE
1226         $(Q)$(MAKE) $(build)=$(package-dir) $@
1227 %pkg: include/config/kernel.release FORCE
1228         $(Q)$(MAKE) $(build)=$(package-dir) $@
1229 rpm: include/config/kernel.release FORCE
1230         $(Q)$(MAKE) $(build)=$(package-dir) $@
1231
1232
1233 # Brief documentation of the typical targets used
1234 # ---------------------------------------------------------------------------
1235
1236 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1237 boards := $(notdir $(boards))
1238 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1239 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1240
1241 help:
1242         @echo  'Cleaning targets:'
1243         @echo  '  clean           - Remove most generated files but keep the config and'
1244         @echo  '                    enough build support to build external modules'
1245         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1246         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1247         @echo  ''
1248         @echo  'Configuration targets:'
1249         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1250         @echo  ''
1251         @echo  'Other generic targets:'
1252         @echo  '  all             - Build all targets marked with [*]'
1253         @echo  '* vmlinux         - Build the bare kernel'
1254         @echo  '* modules         - Build all modules'
1255         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1256         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1257         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1258         @echo  '  dir/            - Build all files in dir and below'
1259         @echo  '  dir/file.[oisS] - Build specified target only'
1260         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1261         @echo  '                    (requires a recent binutils and recent build (System.map))'
1262         @echo  '  dir/file.ko     - Build module including final link'
1263         @echo  '  modules_prepare - Set up for building external modules'
1264         @echo  '  tags/TAGS       - Generate tags file for editors'
1265         @echo  '  cscope          - Generate cscope index'
1266         @echo  '  gtags           - Generate GNU GLOBAL index'
1267         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1268         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1269         @echo  '  image_name      - Output the image name (use with make -s)'
1270         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1271          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1272          echo  ''
1273         @echo  'Static analysers'
1274         @echo  '  checkstack      - Generate a list of stack hogs'
1275         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1276         @echo  '  versioncheck    - Sanity check on version.h usage'
1277         @echo  '  includecheck    - Check for duplicate included header files'
1278         @echo  '  export_report   - List the usages of all exported symbols'
1279         @echo  '  headers_check   - Sanity check on exported headers'
1280         @echo  '  headerdep       - Detect inclusion cycles in headers'
1281         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1282         @echo  ''
1283         @echo  'Kernel selftest'
1284         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1285         @echo  '                    Build, install, and boot kernel before'
1286         @echo  '                    running kselftest on it'
1287         @echo  ''
1288         @echo  'Kernel packaging:'
1289         @$(MAKE) $(build)=$(package-dir) help
1290         @echo  ''
1291         @echo  'Documentation targets:'
1292         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1293         @echo  ''
1294         @echo  'Architecture specific targets ($(SRCARCH)):'
1295         @$(if $(archhelp),$(archhelp),\
1296                 echo '  No architecture specific help defined for $(SRCARCH)')
1297         @echo  ''
1298         @$(if $(boards), \
1299                 $(foreach b, $(boards), \
1300                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1301                 echo '')
1302         @$(if $(board-dirs), \
1303                 $(foreach b, $(board-dirs), \
1304                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1305                 printf "  %-16s - Show all of the above\\n" help-boards; \
1306                 echo '')
1307
1308         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1309         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1310         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1311         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1312         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1313         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1314         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1315         @echo  '                1: warnings which may be relevant and do not occur too often'
1316         @echo  '                2: warnings which occur quite often but may still be relevant'
1317         @echo  '                3: more obscure warnings, can most likely be ignored'
1318         @echo  '                Multiple levels can be combined with W=12 or W=123'
1319         @echo  ''
1320         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1321         @echo  'For further info see the ./README file'
1322
1323
1324 help-board-dirs := $(addprefix help-,$(board-dirs))
1325
1326 help-boards: $(help-board-dirs)
1327
1328 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1329
1330 $(help-board-dirs): help-%:
1331         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1332         @$(if $(boards-per-dir), \
1333                 $(foreach b, $(boards-per-dir), \
1334                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1335                 echo '')
1336
1337
1338 # Documentation targets
1339 # ---------------------------------------------------------------------------
1340 %docs: scripts_basic FORCE
1341         $(Q)$(MAKE) $(build)=scripts build_docproc
1342         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1343
1344 else # KBUILD_EXTMOD
1345
1346 ###
1347 # External module support.
1348 # When building external modules the kernel used as basis is considered
1349 # read-only, and no consistency checks are made and the make
1350 # system is not used on the basis kernel. If updates are required
1351 # in the basis kernel ordinary make commands (without M=...) must
1352 # be used.
1353 #
1354 # The following are the only valid targets when building external
1355 # modules.
1356 # make M=dir clean     Delete all automatically generated files
1357 # make M=dir modules   Make all modules in specified dir
1358 # make M=dir           Same as 'make M=dir modules'
1359 # make M=dir modules_install
1360 #                      Install the modules built in the module directory
1361 #                      Assumes install directory is already created
1362
1363 # We are always building modules
1364 KBUILD_MODULES := 1
1365 PHONY += crmodverdir
1366 crmodverdir:
1367         $(cmd_crmodverdir)
1368
1369 PHONY += $(objtree)/Module.symvers
1370 $(objtree)/Module.symvers:
1371         @test -e $(objtree)/Module.symvers || ( \
1372         echo; \
1373         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1374         echo "           is missing; modules will have no dependencies and modversions."; \
1375         echo )
1376
1377 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1378 PHONY += $(module-dirs) modules
1379 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1380         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1381
1382 modules: $(module-dirs)
1383         @$(kecho) '  Building modules, stage 2.';
1384         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1385
1386 PHONY += modules_install
1387 modules_install: _emodinst_ _emodinst_post
1388
1389 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1390 PHONY += _emodinst_
1391 _emodinst_:
1392         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1393         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1394
1395 PHONY += _emodinst_post
1396 _emodinst_post: _emodinst_
1397         $(call cmd,depmod)
1398
1399 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1400
1401 PHONY += $(clean-dirs) clean
1402 $(clean-dirs):
1403         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1404
1405 clean:  rm-dirs := $(MODVERDIR)
1406 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1407
1408 help:
1409         @echo  '  Building external modules.'
1410         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1411         @echo  ''
1412         @echo  '  modules         - default target, build the module(s)'
1413         @echo  '  modules_install - install the module'
1414         @echo  '  clean           - remove generated files in module directory only'
1415         @echo  ''
1416
1417 # Dummies...
1418 PHONY += prepare scripts
1419 prepare: ;
1420 scripts: ;
1421 endif # KBUILD_EXTMOD
1422
1423 clean: $(clean-dirs)
1424         $(call cmd,rmdirs)
1425         $(call cmd,rmfiles)
1426         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1427                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1428                 -o -name '*.ko.*' \
1429                 -o -name '*.dwo'  \
1430                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1431                 -o -name '*.symtypes' -o -name 'modules.order' \
1432                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1433                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1434
1435 # Generate tags for editors
1436 # ---------------------------------------------------------------------------
1437 quiet_cmd_tags = GEN     $@
1438       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1439
1440 tags TAGS cscope gtags: FORCE
1441         $(call cmd,tags)
1442
1443 # Scripts to check various things for consistency
1444 # ---------------------------------------------------------------------------
1445
1446 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1447
1448 includecheck:
1449         find $(srctree)/* $(RCS_FIND_IGNORE) \
1450                 -name '*.[hcS]' -type f -print | sort \
1451                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1452
1453 versioncheck:
1454         find $(srctree)/* $(RCS_FIND_IGNORE) \
1455                 -name '*.[hcS]' -type f -print | sort \
1456                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1457
1458 coccicheck:
1459         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1460
1461 namespacecheck:
1462         $(PERL) $(srctree)/scripts/namespace.pl
1463
1464 export_report:
1465         $(PERL) $(srctree)/scripts/export_report.pl
1466
1467 endif #ifeq ($(config-targets),1)
1468 endif #ifeq ($(mixed-targets),1)
1469
1470 PHONY += checkstack kernelrelease kernelversion image_name
1471
1472 # UML needs a little special treatment here.  It wants to use the host
1473 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1474 # else wants $(ARCH), including people doing cross-builds, which means
1475 # that $(SUBARCH) doesn't work here.
1476 ifeq ($(ARCH), um)
1477 CHECKSTACK_ARCH := $(SUBARCH)
1478 else
1479 CHECKSTACK_ARCH := $(ARCH)
1480 endif
1481 checkstack:
1482         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1483         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1484
1485 kernelrelease:
1486         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1487
1488 kernelversion:
1489         @echo $(KERNELVERSION)
1490
1491 image_name:
1492         @echo $(KBUILD_IMAGE)
1493
1494 # Clear a bunch of variables before executing the submake
1495 tools/: FORCE
1496         $(Q)mkdir -p $(objtree)/tools
1497         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1498
1499 tools/%: FORCE
1500         $(Q)mkdir -p $(objtree)/tools
1501         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1502
1503 # Single targets
1504 # ---------------------------------------------------------------------------
1505 # Single targets are compatible with:
1506 # - build with mixed source and output
1507 # - build with separate output dir 'make O=...'
1508 # - external modules
1509 #
1510 #  target-dir => where to store outputfile
1511 #  build-dir  => directory in kernel source tree to use
1512
1513 ifeq ($(KBUILD_EXTMOD),)
1514         build-dir  = $(patsubst %/,%,$(dir $@))
1515         target-dir = $(dir $@)
1516 else
1517         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1518         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1519         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1520 endif
1521
1522 %.s: %.c prepare scripts FORCE
1523         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524 %.i: %.c prepare scripts FORCE
1525         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526 %.o: %.c prepare scripts FORCE
1527         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528 %.lst: %.c prepare scripts FORCE
1529         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530 %.s: %.S prepare scripts FORCE
1531         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1532 %.o: %.S prepare scripts FORCE
1533         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1534 %.symtypes: %.c prepare scripts FORCE
1535         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1536
1537 # Modules
1538 /: prepare scripts FORCE
1539         $(cmd_crmodverdir)
1540         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1541         $(build)=$(build-dir)
1542 # Make sure the latest headers are built for Documentation
1543 Documentation/: headers_install
1544 %/: prepare scripts FORCE
1545         $(cmd_crmodverdir)
1546         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1547         $(build)=$(build-dir)
1548 %.ko: prepare scripts FORCE
1549         $(cmd_crmodverdir)
1550         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1551         $(build)=$(build-dir) $(@:.ko=.o)
1552         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1553
1554 # FIXME Should go into a make.lib or something
1555 # ===========================================================================
1556
1557 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1558       cmd_rmdirs = rm -rf $(rm-dirs)
1559
1560 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1561       cmd_rmfiles = rm -f $(rm-files)
1562
1563 # Run depmod only if we have System.map and depmod is executable
1564 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1565       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1566                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1567
1568 # Create temporary dir for module support files
1569 # clean it up only when building all modules
1570 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1571                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1572
1573 # read all saved command lines
1574
1575 targets := $(wildcard $(sort $(targets)))
1576 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1577
1578 ifneq ($(cmd_files),)
1579   $(cmd_files): ;       # Do not try to update included dependency files
1580   include $(cmd_files)
1581 endif
1582
1583 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1584 # Usage:
1585 # $(Q)$(MAKE) $(clean)=dir
1586 clean := -f $(srctree)/scripts/Makefile.clean obj
1587
1588 endif   # skip-makefile
1589
1590 PHONY += FORCE
1591 FORCE:
1592
1593 # Declare the contents of the .PHONY variable as phony.  We keep that
1594 # information in a variable so we can use it in if_changed and friends.
1595 .PHONY: $(PHONY)