Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 4
   3 SUBLEVEL = 141
   4 EXTRAVERSION =
   5 NAME = Blurry Fish Butt
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # o Do not use make's built-in rules and variables
  14 #   (this increases performance and avoids hard-to-debug behaviour);
  15 # o Look for make include files relative to root of kernel src
  16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  17
  18 # Avoid funny character set dependencies
  19 unexport LC_ALL
  20 LC_COLLATE=C
  21 LC_NUMERIC=C
  22 export LC_COLLATE LC_NUMERIC
  23
  24 # Avoid interference with shell env settings
  25 unexport GREP_OPTIONS
  26
  27 # We are using a recursive build, so we need to do a little thinking
  28 # to get the ordering right.
  29 #
  30 # Most importantly: sub-Makefiles should only ever modify files in
  31 # their own directory. If in some directory we have a dependency on
  32 # a file in another dir (which doesn't happen often, but it's often
  33 # unavoidable when linking the built-in.o targets which finally
  34 # turn into vmlinux), we will call a sub make in that other dir, and
  35 # after that we are sure that everything which is in that other dir
  36 # is now up to date.
  37 #
  38 # The only cases where we need to modify files which have global
  39 # effects are thus separated out and done before the recursive
  40 # descending is started. They are now explicitly listed as the
  41 # prepare rule.
  42
  43 # Beautify output
  44 # ---------------------------------------------------------------------------
  45 #
  46 # Normally, we echo the whole command before executing it. By making
  47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  48 # $(quiet) to choose other forms of output instead, e.g.
  49 #
  50 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  51 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  52 #
  53 # If $(quiet) is empty, the whole command will be printed.
  54 # If it is set to "quiet_", only the short version will be printed.
  55 # If it is set to "silent_", nothing will be printed at all, since
  56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  57 #
  58 # A simple variant is to prefix commands with $(Q) - that's useful
  59 # for commands that shall be hidden in non-verbose mode.
  60 #
  61 #       $(Q)ln $@ :<
  62 #
  63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  65 #
  66 # To put more focus on warnings, be less verbose as default
  67 # Use 'make V=1' to see the full commands
  68
  69 ifeq ("$(origin V)", "command line")
  70   KBUILD_VERBOSE = $(V)
  71 endif
  72 ifndef KBUILD_VERBOSE
  73   KBUILD_VERBOSE = 0
  74 endif
  75
  76 ifeq ($(KBUILD_VERBOSE),1)
  77   quiet =
  78   Q =
  79 else
  80   quiet=quiet_
  81   Q = @
  82 endif
  83
  84 # If the user is running make -s (silent mode), suppress echoing of
  85 # commands
  86
  87 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
  88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  89   quiet=silent_
  90   tools_silent=s
  91 endif
  92 else                                    # make-3.8x
  93 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  94   quiet=silent_
  95   tools_silent=-s
  96 endif
  97 endif
  98
  99 export quiet Q KBUILD_VERBOSE
 100
 101 # kbuild supports saving output files in a separate directory.
 102 # To locate output files in a separate directory two syntaxes are supported.
 103 # In both cases the working directory must be the root of the kernel src.
 104 # 1) O=
 105 # Use "make O=dir/to/store/output/files/"
 106 #
 107 # 2) Set KBUILD_OUTPUT
 108 # Set the environment variable KBUILD_OUTPUT to point to the directory
 109 # where the output files shall be placed.
 110 # export KBUILD_OUTPUT=dir/to/store/output/files/
 111 # make
 112 #
 113 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 114 # variable.
 115
 116 # KBUILD_SRC is set on invocation of make in OBJ directory
 117 # KBUILD_SRC is not intended to be used by the regular user (for now)
 118 ifeq ($(KBUILD_SRC),)
 119
 120 # OK, Make called in directory where kernel src resides
 121 # Do we want to locate output files in a separate directory?
 122 ifeq ("$(origin O)", "command line")
 123   KBUILD_OUTPUT := $(O)
 124 endif
 125
 126 # That's our default target when none is given on the command line
 127 PHONY := _all
 128 _all:
 129
 130 # Cancel implicit rules on top Makefile
 131 $(CURDIR)/Makefile Makefile: ;
 132
 133 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 134   $(error main directory cannot contain spaces nor colons)
 135 endif
 136
 137 ifneq ($(KBUILD_OUTPUT),)
 138 # Invoke a second make in the output directory, passing relevant variables
 139 # check that the output directory actually exists
 140 saved-output := $(KBUILD_OUTPUT)
 141 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 142                                                                 && /bin/pwd)
 143 $(if $(KBUILD_OUTPUT),, \
 144      $(error failed to create output directory "$(saved-output)"))
 145
 146 PHONY += $(MAKECMDGOALS) sub-make
 147
 148 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 149         @:
 150
 151 sub-make: FORCE
 152         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 153         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 154
 155 # Leave processing to above invocation of make
 156 skip-makefile := 1
 157 endif # ifneq ($(KBUILD_OUTPUT),)
 158 endif # ifeq ($(KBUILD_SRC),)
 159
 160 # We process the rest of the Makefile if this is the final invocation of make
 161 ifeq ($(skip-makefile),)
 162
 163 # Do not print "Entering directory ...",
 164 # but we want to display it when entering to the output directory
 165 # so that IDEs/editors are able to understand relative filenames.
 166 MAKEFLAGS += --no-print-directory
 167
 168 # Call a source code checker (by default, "sparse") as part of the
 169 # C compilation.
 170 #
 171 # Use 'make C=1' to enable checking of only re-compiled files.
 172 # Use 'make C=2' to enable checking of *all* source files, regardless
 173 # of whether they are re-compiled or not.
 174 #
 175 # See the file "Documentation/sparse.txt" for more details, including
 176 # where to get the "sparse" utility.
 177
 178 ifeq ("$(origin C)", "command line")
 179   KBUILD_CHECKSRC = $(C)
 180 endif
 181 ifndef KBUILD_CHECKSRC
 182   KBUILD_CHECKSRC = 0
 183 endif
 184
 185 # Use make M=dir to specify directory of external module to build
 186 # Old syntax make ... SUBDIRS=$PWD is still supported
 187 # Setting the environment variable KBUILD_EXTMOD take precedence
 188 ifdef SUBDIRS
 189   KBUILD_EXTMOD ?= $(SUBDIRS)
 190 endif
 191
 192 ifeq ("$(origin M)", "command line")
 193   KBUILD_EXTMOD := $(M)
 194 endif
 195
 196 # If building an external module we do not care about the all: rule
 197 # but instead _all depend on modules
 198 PHONY += all
 199 ifeq ($(KBUILD_EXTMOD),)
 200 _all: all
 201 else
 202 _all: modules
 203 endif
 204
 205 ifeq ($(KBUILD_SRC),)
 206         # building in the source tree
 207         srctree := .
 208 else
 209         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 210                 # building in a subdirectory of the source tree
 211                 srctree := ..
 212         else
 213                 srctree := $(KBUILD_SRC)
 214         endif
 215 endif
 216 objtree         := .
 217 src             := $(srctree)
 218 obj             := $(objtree)
 219
 220 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 221
 222 export srctree objtree VPATH
 223
 224 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 225 # first, and if a usermode build is happening, the "ARCH=um" on the command
 226 # line overrides the setting of ARCH below.  If a native build is happening,
 227 # then ARCH is assigned, getting whatever value it gets normally, and
 228 # SUBARCH is subsequently ignored.
 229
 230 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 231                                   -e s/sun4u/sparc64/ \
 232                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 233                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 234                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 235                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 236
 237 # Cross compiling and selecting different set of gcc/bin-utils
 238 # ---------------------------------------------------------------------------
 239 #
 240 # When performing cross compilation for other architectures ARCH shall be set
 241 # to the target architecture. (See arch/* for the possibilities).
 242 # ARCH can be set during invocation of make:
 243 # make ARCH=ia64
 244 # Another way is to have ARCH set in the environment.
 245 # The default ARCH is the host where make is executed.
 246
 247 # CROSS_COMPILE specify the prefix used for all executables used
 248 # during compilation. Only gcc and related bin-utils executables
 249 # are prefixed with $(CROSS_COMPILE).
 250 # CROSS_COMPILE can be set on the command line
 251 # make CROSS_COMPILE=ia64-linux-
 252 # Alternatively CROSS_COMPILE can be set in the environment.
 253 # A third alternative is to store a setting in .config so that plain
 254 # "make" in the configured kernel build directory always uses that.
 255 # Default value for CROSS_COMPILE is not to prefix executables
 256 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 257 ARCH            ?= $(SUBARCH)
 258 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 259
 260 # Architecture as present in compile.h
 261 UTS_MACHINE     := $(ARCH)
 262 SRCARCH         := $(ARCH)
 263
 264 # Additional ARCH settings for x86
 265 ifeq ($(ARCH),i386)
 266         SRCARCH := x86
 267 endif
 268 ifeq ($(ARCH),x86_64)
 269         SRCARCH := x86
 270 endif
 271
 272 # Additional ARCH settings for sparc
 273 ifeq ($(ARCH),sparc32)
 274        SRCARCH := sparc
 275 endif
 276 ifeq ($(ARCH),sparc64)
 277        SRCARCH := sparc
 278 endif
 279
 280 # Additional ARCH settings for sh
 281 ifeq ($(ARCH),sh64)
 282        SRCARCH := sh
 283 endif
 284
 285 # Additional ARCH settings for tile
 286 ifeq ($(ARCH),tilepro)
 287        SRCARCH := tile
 288 endif
 289 ifeq ($(ARCH),tilegx)
 290        SRCARCH := tile
 291 endif
 292
 293 # Where to locate arch specific headers
 294 hdr-arch  := $(SRCARCH)
 295
 296 KCONFIG_CONFIG  ?= .config
 297 export KCONFIG_CONFIG
 298
 299 # SHELL used by kbuild
 300 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 301           else if [ -x /bin/bash ]; then echo /bin/bash; \
 302           else echo sh; fi ; fi)
 303
 304 HOSTCC       = gcc
 305 HOSTCXX      = g++
 306 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 307 HOSTCXXFLAGS = -O2
 308
 309 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 310 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 311                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 312 endif
 313
 314 # Decide whether to build built-in, modular, or both.
 315 # Normally, just do built-in.
 316
 317 KBUILD_MODULES :=
 318 KBUILD_BUILTIN := 1
 319
 320 # If we have only "make modules", don't compile built-in objects.
 321 # When we're building modules with modversions, we need to consider
 322 # the built-in objects during the descend as well, in order to
 323 # make sure the checksums are up to date before we record them.
 324
 325 ifeq ($(MAKECMDGOALS),modules)
 326   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 327 endif
 328
 329 # If we have "make <whatever> modules", compile modules
 330 # in addition to whatever we do anyway.
 331 # Just "make" or "make all" shall build modules as well
 332
 333 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 334   KBUILD_MODULES := 1
 335 endif
 336
 337 ifeq ($(MAKECMDGOALS),)
 338   KBUILD_MODULES := 1
 339 endif
 340
 341 export KBUILD_MODULES KBUILD_BUILTIN
 342 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 343
 344 # We need some generic definitions (do not try to remake the file).
 345 scripts/Kbuild.include: ;
 346 include scripts/Kbuild.include
 347
 348 # Make variables (CC, etc...)
 349 AS              = $(CROSS_COMPILE)as
 350 LD              = $(CROSS_COMPILE)ld
 351 CC              = $(CROSS_COMPILE)gcc
 352 CPP             = $(CC) -E
 353 AR              = $(CROSS_COMPILE)ar
 354 NM              = $(CROSS_COMPILE)nm
 355 STRIP           = $(CROSS_COMPILE)strip
 356 OBJCOPY         = $(CROSS_COMPILE)objcopy
 357 OBJDUMP         = $(CROSS_COMPILE)objdump
 358 AWK             = awk
 359 GENKSYMS        = scripts/genksyms/genksyms
 360 INSTALLKERNEL  := installkernel
 361 DEPMOD          = /sbin/depmod
 362 PERL            = perl
 363 PYTHON          = python
 364 CHECK           = sparse
 365
 366 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 367                   -Wbitwise -Wno-return-void $(CF)
 368 CFLAGS_MODULE   =
 369 AFLAGS_MODULE   =
 370 LDFLAGS_MODULE  =
 371 CFLAGS_KERNEL   =
 372 AFLAGS_KERNEL   =
 373 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
 374
 375
 376 # Use USERINCLUDE when you must reference the UAPI directories only.
 377 USERINCLUDE    := \
 378                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 379                 -Iarch/$(hdr-arch)/include/generated/uapi \
 380                 -I$(srctree)/include/uapi \
 381                 -Iinclude/generated/uapi \
 382                 -include $(srctree)/include/linux/kconfig.h
 383
 384 # Use LINUXINCLUDE when you must reference the include/ directory.
 385 # Needed to be compatible with the O= option
 386 LINUXINCLUDE    := \
 387                 -I$(srctree)/arch/$(hdr-arch)/include \
 388                 -Iarch/$(hdr-arch)/include/generated/uapi \
 389                 -Iarch/$(hdr-arch)/include/generated \
 390                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 391                 -Iinclude \
 392                 $(USERINCLUDE)
 393
 394 KBUILD_CPPFLAGS := -D__KERNEL__
 395
 396 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 397                    -fno-strict-aliasing -fno-common \
 398                    -Werror-implicit-function-declaration \
 399                    -Wno-format-security \
 400                    -std=gnu89 $(call cc-option,-fno-PIE)
 401
 402
 403 KBUILD_AFLAGS_KERNEL :=
 404 KBUILD_CFLAGS_KERNEL :=
 405 KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
 406 KBUILD_AFLAGS_MODULE  := -DMODULE
 407 KBUILD_CFLAGS_MODULE  := -DMODULE
 408 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 409
 410 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 411 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 412 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 413
 414 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 415 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 416 export CPP AR NM STRIP OBJCOPY OBJDUMP
 417 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 418 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 419
 420 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 421 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
 422 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 423 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 424 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 425 export KBUILD_ARFLAGS
 426
 427 # When compiling out-of-tree modules, put MODVERDIR in the module
 428 # tree rather than in the kernel tree. The kernel tree might
 429 # even be read-only.
 430 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 431
 432 # Files to ignore in find ... statements
 433
 434 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 435                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 436                           -prune -o
 437 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 438                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 439
 440 # ===========================================================================
 441 # Rules shared between *config targets and build targets
 442
 443 # Basic helpers built in scripts/
 444 PHONY += scripts_basic
 445 scripts_basic:
 446         $(Q)$(MAKE) $(build)=scripts/basic
 447         $(Q)rm -f .tmp_quiet_recordmcount
 448
 449 # To avoid any implicit rule to kick in, define an empty command.
 450 scripts/basic/%: scripts_basic ;
 451
 452 PHONY += outputmakefile
 453 # outputmakefile generates a Makefile in the output directory, if using a
 454 # separate output directory. This allows convenient use of make in the
 455 # output directory.
 456 outputmakefile:
 457 ifneq ($(KBUILD_SRC),)
 458         $(Q)ln -fsn $(srctree) source
 459         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 460             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 461 endif
 462
 463 # Support for using generic headers in asm-generic
 464 PHONY += asm-generic
 465 asm-generic:
 466         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 467                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 468         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 469                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 470
 471 # To make sure we do not include .config for any of the *config targets
 472 # catch them early, and hand them over to scripts/kconfig/Makefile
 473 # It is allowed to specify more targets when calling make, including
 474 # mixing *config targets and build targets.
 475 # For example 'make oldconfig all'.
 476 # Detect when mixed targets is specified, and make a second invocation
 477 # of make so .config is not included in this case either (for *config).
 478
 479 version_h := include/generated/uapi/linux/version.h
 480 old_version_h := include/linux/version.h
 481
 482 no-dot-config-targets := clean mrproper distclean \
 483                          cscope gtags TAGS tags help% %docs check% coccicheck \
 484                          $(version_h) headers_% archheaders archscripts \
 485                          kernelversion %src-pkg
 486
 487 config-targets := 0
 488 mixed-targets  := 0
 489 dot-config     := 1
 490
 491 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 492         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 493                 dot-config := 0
 494         endif
 495 endif
 496
 497 ifeq ($(KBUILD_EXTMOD),)
 498         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 499                 config-targets := 1
 500                 ifneq ($(words $(MAKECMDGOALS)),1)
 501                         mixed-targets := 1
 502                 endif
 503         endif
 504 endif
 505 # install and module_install need also be processed one by one
 506 ifneq ($(filter install,$(MAKECMDGOALS)),)
 507         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 508                 mixed-targets := 1
 509         endif
 510 endif
 511
 512 ifeq ($(mixed-targets),1)
 513 # ===========================================================================
 514 # We're called with mixed targets (*config and build targets).
 515 # Handle them one by one.
 516
 517 PHONY += $(MAKECMDGOALS) __build_one_by_one
 518
 519 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 520         @:
 521
 522 __build_one_by_one:
 523         $(Q)set -e; \
 524         for i in $(MAKECMDGOALS); do \
 525                 $(MAKE) -f $(srctree)/Makefile $$i; \
 526         done
 527
 528 else
 529 ifeq ($(config-targets),1)
 530 # ===========================================================================
 531 # *config targets only - make sure prerequisites are updated, and descend
 532 # in scripts/kconfig to make the *config target
 533
 534 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 535 # KBUILD_DEFCONFIG may point out an alternative default configuration
 536 # used for 'make defconfig'
 537 include arch/$(SRCARCH)/Makefile
 538 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 539
 540 config: scripts_basic outputmakefile FORCE
 541         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 542
 543 %config: scripts_basic outputmakefile FORCE
 544         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 545
 546 else
 547 # ===========================================================================
 548 # Build targets only - this includes vmlinux, arch specific targets, clean
 549 # targets and others. In general all targets except *config targets.
 550
 551 ifeq ($(KBUILD_EXTMOD),)
 552 # Additional helpers built in scripts/
 553 # Carefully list dependencies so we do not try to build scripts twice
 554 # in parallel
 555 PHONY += scripts
 556 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 557          asm-generic
 558         $(Q)$(MAKE) $(build)=$(@)
 559
 560 # Objects we will link into vmlinux / subdirs we need to visit
 561 init-y          := init/
 562 drivers-y       := drivers/ sound/ firmware/
 563 net-y           := net/
 564 libs-y          := lib/
 565 core-y          := usr/
 566 virt-y          := virt/
 567 endif # KBUILD_EXTMOD
 568
 569 ifeq ($(dot-config),1)
 570 # Read in config
 571 -include include/config/auto.conf
 572
 573 ifeq ($(KBUILD_EXTMOD),)
 574 # Read in dependencies to all Kconfig* files, make sure to run
 575 # oldconfig if changes are detected.
 576 -include include/config/auto.conf.cmd
 577
 578 # To avoid any implicit rule to kick in, define an empty command
 579 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 580
 581 # If .config is newer than include/config/auto.conf, someone tinkered
 582 # with it and forgot to run make oldconfig.
 583 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 584 # we execute the config step to be sure to catch updated Kconfig files
 585 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 586         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 587 else
 588 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 589 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 590 PHONY += include/config/auto.conf
 591
 592 include/config/auto.conf:
 593         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 594         echo >&2;                                                       \
 595         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 596         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 597         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 598         echo >&2 ;                                                      \
 599         /bin/false)
 600
 601 endif # KBUILD_EXTMOD
 602
 603 else
 604 # Dummy target needed, because used as prerequisite
 605 include/config/auto.conf: ;
 606 endif # $(dot-config)
 607
 608 # The all: target is the default when no target is given on the
 609 # command line.
 610 # This allow a user to issue only 'make' to build a kernel including modules
 611 # Defaults to vmlinux, but the arch makefile usually adds further targets
 612 all: vmlinux
 613
 614 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 615 # values of the respective KBUILD_* variables
 616 ARCH_CPPFLAGS :=
 617 ARCH_AFLAGS :=
 618 ARCH_CFLAGS :=
 619 include arch/$(SRCARCH)/Makefile
 620
 621 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 622 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 623 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 624 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 625 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 626 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 627
 628 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 629 KBUILD_CFLAGS   += -Os
 630 else
 631 ifdef CONFIG_PROFILE_ALL_BRANCHES
 632 KBUILD_CFLAGS   += -O2
 633 else
 634 KBUILD_CFLAGS   += -O2
 635 endif
 636 endif
 637
 638 # Tell gcc to never replace conditional load with a non-conditional one
 639 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 640
 641 # check for 'asm goto'
 642 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 643         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 644         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 645 endif
 646
 647 ifdef CONFIG_READABLE_ASM
 648 # Disable optimizations that make assembler listings hard to read.
 649 # reorder blocks reorders the control in the function
 650 # ipa clone creates specialized cloned functions
 651 # partial inlining inlines only parts of functions
 652 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 653                  $(call cc-option,-fno-ipa-cp-clone,) \
 654                  $(call cc-option,-fno-partial-inlining)
 655 endif
 656
 657 ifneq ($(CONFIG_FRAME_WARN),0)
 658 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 659 endif
 660
 661 # Handle stack protector mode.
 662 #
 663 # Since kbuild can potentially perform two passes (first with the old
 664 # .config values and then with updated .config values), we cannot error out
 665 # if a desired compiler option is unsupported. If we were to error, kbuild
 666 # could never get to the second pass and actually notice that we changed
 667 # the option to something that was supported.
 668 #
 669 # Additionally, we don't want to fallback and/or silently change which compiler
 670 # flags will be used, since that leads to producing kernels with different
 671 # security feature characteristics depending on the compiler used. ("But I
 672 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
 673 #
 674 # The middle ground is to warn here so that the failed option is obvious, but
 675 # to let the build fail with bad compiler flags so that we can't produce a
 676 # kernel when there is a CONFIG and compiler mismatch.
 677 #
 678 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 679   stackp-flag := -fstack-protector
 680   ifeq ($(call cc-option, $(stackp-flag)),)
 681     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
 682              -fstack-protector not supported by compiler)
 683   endif
 684 else
 685 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 686   stackp-flag := -fstack-protector-strong
 687   ifeq ($(call cc-option, $(stackp-flag)),)
 688     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 689               -fstack-protector-strong not supported by compiler)
 690   endif
 691 else
 692   # Force off for distro compilers that enable stack protector by default.
 693   stackp-flag := $(call cc-option, -fno-stack-protector)
 694 endif
 695 endif
 696 KBUILD_CFLAGS += $(stackp-flag)
 697
 698 ifeq ($(cc-name),clang)
 699 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 700 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 701 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 702 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 703 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 704 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 705 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 706 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 707 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 708 # See modpost pattern 2
 709 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 710 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 711 else
 712
 713 # These warnings generated too much noise in a regular build.
 714 # Use make W=1 to enable them (see scripts/Makefile.build)
 715 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 716 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 717 endif
 718
 719 ifdef CONFIG_FRAME_POINTER
 720 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 721 else
 722 # Some targets (ARM with Thumb2, for example), can't be built with frame
 723 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 724 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 725 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 726 # -fomit-frame-pointer with FUNCTION_TRACER.
 727 ifndef CONFIG_FUNCTION_TRACER
 728 KBUILD_CFLAGS   += -fomit-frame-pointer
 729 endif
 730 endif
 731
 732 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 733
 734 ifdef CONFIG_DEBUG_INFO
 735 ifdef CONFIG_DEBUG_INFO_SPLIT
 736 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 737 else
 738 KBUILD_CFLAGS   += -g
 739 endif
 740 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 741 endif
 742 ifdef CONFIG_DEBUG_INFO_DWARF4
 743 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 744 endif
 745
 746 ifdef CONFIG_DEBUG_INFO_REDUCED
 747 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 748                    $(call cc-option,-fno-var-tracking)
 749 endif
 750
 751 ifdef CONFIG_FUNCTION_TRACER
 752 ifndef CC_FLAGS_FTRACE
 753 CC_FLAGS_FTRACE := -pg
 754 endif
 755 export CC_FLAGS_FTRACE
 756 ifdef CONFIG_HAVE_FENTRY
 757 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 758 endif
 759 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 760 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 761 ifdef CONFIG_DYNAMIC_FTRACE
 762         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 763                 BUILD_C_RECORDMCOUNT := y
 764                 export BUILD_C_RECORDMCOUNT
 765         endif
 766 endif
 767 endif
 768
 769 # We trigger additional mismatches with less inlining
 770 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 771 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 772 endif
 773
 774 # arch Makefile may override CC so keep this after arch Makefile is included
 775 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 776 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 777
 778 # warn about C99 declaration after statement
 779 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 780
 781 # disable pointer signed / unsigned warnings in gcc 4.0
 782 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 783
 784 # disable invalid "can't wrap" optimizations for signed / pointers
 785 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 786
 787 # clang sets -fmerge-all-constants by default as optimization, but this
 788 # is non-conforming behavior for C and in fact breaks the kernel, so we
 789 # need to disable it here generally.
 790 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 791
 792 # for gcc -fno-merge-all-constants disables everything, but it is fine
 793 # to have actual conforming behavior enabled.
 794 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 795
 796 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 797 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 798
 799 # conserve stack if available
 800 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 801
 802 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 803 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 804
 805 # require functions to have arguments in prototypes, not empty 'int foo()'
 806 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 807
 808 # Prohibit date/time macros, which would make the build non-deterministic
 809 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 810
 811 # use the deterministic mode of AR if available
 812 KBUILD_ARFLAGS := $(call ar-option,D)
 813
 814 include scripts/Makefile.kasan
 815 include scripts/Makefile.extrawarn
 816
 817 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 818 # last assignments
 819 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 820 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 821 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 822
 823 # Use --build-id when available.
 824 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 825                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 826 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 827 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 828
 829 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 830 LDFLAGS_vmlinux += $(call ld-option, -X,)
 831 endif
 832
 833 # Default kernel image to build when no specific target is given.
 834 # KBUILD_IMAGE may be overruled on the command line or
 835 # set in the environment
 836 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 837 # this default value
 838 export KBUILD_IMAGE ?= vmlinux
 839
 840 #
 841 # INSTALL_PATH specifies where to place the updated kernel and system map
 842 # images. Default is /boot, but you can set it to other values
 843 export  INSTALL_PATH ?= /boot
 844
 845 #
 846 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 847 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 848 # an argument if needed. Otherwise it defaults to the kernel install path
 849 #
 850 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 851
 852 #
 853 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 854 # relocations required by build roots.  This is not defined in the
 855 # makefile but the argument can be passed to make if needed.
 856 #
 857
 858 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 859 export MODLIB
 860
 861 #
 862 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 863 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 864 # the default option --strip-debug will be used.  Otherwise,
 865 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 866
 867 ifdef INSTALL_MOD_STRIP
 868 ifeq ($(INSTALL_MOD_STRIP),1)
 869 mod_strip_cmd = $(STRIP) --strip-debug
 870 else
 871 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 872 endif # INSTALL_MOD_STRIP=1
 873 else
 874 mod_strip_cmd = true
 875 endif # INSTALL_MOD_STRIP
 876 export mod_strip_cmd
 877
 878 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 879 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 880 # or CONFIG_MODULE_COMPRESS_XZ.
 881
 882 mod_compress_cmd = true
 883 ifdef CONFIG_MODULE_COMPRESS
 884   ifdef CONFIG_MODULE_COMPRESS_GZIP
 885     mod_compress_cmd = gzip -n -f
 886   endif # CONFIG_MODULE_COMPRESS_GZIP
 887   ifdef CONFIG_MODULE_COMPRESS_XZ
 888     mod_compress_cmd = xz -f
 889   endif # CONFIG_MODULE_COMPRESS_XZ
 890 endif # CONFIG_MODULE_COMPRESS
 891 export mod_compress_cmd
 892
 893 # Select initial ramdisk compression format, default is gzip(1).
 894 # This shall be used by the dracut(8) tool while creating an initramfs image.
 895 #
 896 INITRD_COMPRESS-y                  := gzip
 897 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 898 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 899 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 900 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 901 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 902 # do not export INITRD_COMPRESS, since we didn't actually
 903 # choose a sane default compression above.
 904 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 905
 906 ifdef CONFIG_MODULE_SIG_ALL
 907 $(eval $(call config_filename,MODULE_SIG_KEY))
 908
 909 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 910 else
 911 mod_sign_cmd = true
 912 endif
 913 export mod_sign_cmd
 914
 915
 916 ifeq ($(KBUILD_EXTMOD),)
 917 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 918
 919 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 920                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 921                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 922
 923 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 924                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 925
 926 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 927 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 928 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 929 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 930 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 931 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 932 libs-y          := $(libs-y1) $(libs-y2)
 933 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 934
 935 # Externally visible symbols (used by link-vmlinux.sh)
 936 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 937 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 938 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 939 export LDFLAGS_vmlinux
 940 # used by scripts/pacmage/Makefile
 941 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 942
 943 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 944
 945 # Final link of vmlinux
 946       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 947 quiet_cmd_link-vmlinux = LINK    $@
 948
 949 # Include targets which we want to
 950 # execute if the rest of the kernel build went well.
 951 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 952 ifdef CONFIG_HEADERS_CHECK
 953         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 954 endif
 955 ifdef CONFIG_SAMPLES
 956         $(Q)$(MAKE) $(build)=samples
 957 endif
 958 ifdef CONFIG_BUILD_DOCSRC
 959         $(Q)$(MAKE) $(build)=Documentation
 960 endif
 961 ifdef CONFIG_GDB_SCRIPTS
 962         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 963 endif
 964         +$(call if_changed,link-vmlinux)
 965
 966 # The actual objects are generated when descending,
 967 # make sure no implicit rule kicks in
 968 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 969
 970 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 971 # Preset locale variables to speed up the build process. Limit locale
 972 # tweaks to this spot to avoid wrong language settings when running
 973 # make menuconfig etc.
 974 # Error messages still appears in the original language
 975
 976 PHONY += $(vmlinux-dirs)
 977 $(vmlinux-dirs): prepare scripts
 978         $(Q)$(MAKE) $(build)=$@
 979
 980 define filechk_kernel.release
 981         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 982 endef
 983
 984 # Store (new) KERNELRELEASE string in include/config/kernel.release
 985 include/config/kernel.release: include/config/auto.conf FORCE
 986         $(call filechk,kernel.release)
 987
 988
 989 # Things we need to do before we recursively start building the kernel
 990 # or the modules are listed in "prepare".
 991 # A multi level approach is used. prepareN is processed before prepareN-1.
 992 # archprepare is used in arch Makefiles and when processed asm symlink,
 993 # version.h and scripts_basic is processed / created.
 994
 995 # Listed in dependency order
 996 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 997
 998 # prepare3 is used to check if we are building in a separate output directory,
 999 # and if so do:
1000 # 1) Check that make has not been executed in the kernel src $(srctree)
1001 prepare3: include/config/kernel.release
1002 ifneq ($(KBUILD_SRC),)
1003         @$(kecho) '  Using $(srctree) as source for kernel'
1004         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1005                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1006                 echo >&2 "  in the '$(srctree)' directory.";\
1007                 /bin/false; \
1008         fi;
1009 endif
1010
1011 # prepare2 creates a makefile if using a separate output directory
1012 prepare2: prepare3 outputmakefile asm-generic
1013
1014 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1015                    include/config/auto.conf
1016         $(cmd_crmodverdir)
1017
1018 archprepare: archheaders archscripts prepare1 scripts_basic
1019
1020 prepare0: archprepare FORCE
1021         $(Q)$(MAKE) $(build)=.
1022
1023 # All the preparing..
1024 prepare: prepare0
1025
1026 # Generate some files
1027 # ---------------------------------------------------------------------------
1028
1029 # KERNELRELEASE can change from a few different places, meaning version.h
1030 # needs to be updated, so this check is forced on all builds
1031
1032 uts_len := 64
1033 define filechk_utsrelease.h
1034         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1035           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1036           exit 1;                                                         \
1037         fi;                                                               \
1038         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1039 endef
1040
1041 define filechk_version.h
1042         (echo \#define LINUX_VERSION_CODE $(shell                         \
1043         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1044         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1045 endef
1046
1047 $(version_h): $(srctree)/Makefile FORCE
1048         $(call filechk,version.h)
1049         $(Q)rm -f $(old_version_h)
1050
1051 include/generated/utsrelease.h: include/config/kernel.release FORCE
1052         $(call filechk,utsrelease.h)
1053
1054 PHONY += headerdep
1055 headerdep:
1056         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1057         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1058
1059 # ---------------------------------------------------------------------------
1060 # Firmware install
1061 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1062 export INSTALL_FW_PATH
1063
1064 PHONY += firmware_install
1065 firmware_install: FORCE
1066         @mkdir -p $(objtree)/firmware
1067         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1068
1069 # ---------------------------------------------------------------------------
1070 # Kernel headers
1071
1072 #Default location for installed headers
1073 export INSTALL_HDR_PATH = $(objtree)/usr
1074
1075 # If we do an all arch process set dst to asm-$(hdr-arch)
1076 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1077
1078 PHONY += archheaders
1079 archheaders:
1080
1081 PHONY += archscripts
1082 archscripts:
1083
1084 PHONY += __headers
1085 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1086         $(Q)$(MAKE) $(build)=scripts build_unifdef
1087
1088 PHONY += headers_install_all
1089 headers_install_all:
1090         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1091
1092 PHONY += headers_install
1093 headers_install: __headers
1094         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1095           $(error Headers not exportable for the $(SRCARCH) architecture))
1096         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1097         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1098
1099 PHONY += headers_check_all
1100 headers_check_all: headers_install_all
1101         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1102
1103 PHONY += headers_check
1104 headers_check: headers_install
1105         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1106         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1107
1108 # ---------------------------------------------------------------------------
1109 # Kernel selftest
1110
1111 PHONY += kselftest
1112 kselftest:
1113         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1114
1115 kselftest-clean:
1116         $(Q)$(MAKE) -C tools/testing/selftests clean
1117
1118 # ---------------------------------------------------------------------------
1119 # Modules
1120
1121 ifdef CONFIG_MODULES
1122
1123 # By default, build modules as well
1124
1125 all: modules
1126
1127 # Build modules
1128 #
1129 # A module can be listed more than once in obj-m resulting in
1130 # duplicate lines in modules.order files.  Those are removed
1131 # using awk while concatenating to the final file.
1132
1133 PHONY += modules
1134 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1135         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1136         @$(kecho) '  Building modules, stage 2.';
1137         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1138         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1139
1140 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1141         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1142
1143 %/modules.builtin: include/config/auto.conf
1144         $(Q)$(MAKE) $(modbuiltin)=$*
1145
1146
1147 # Target to prepare building external modules
1148 PHONY += modules_prepare
1149 modules_prepare: prepare scripts
1150
1151 # Target to install modules
1152 PHONY += modules_install
1153 modules_install: _modinst_ _modinst_post
1154
1155 PHONY += _modinst_
1156 _modinst_:
1157         @rm -rf $(MODLIB)/kernel
1158         @rm -f $(MODLIB)/source
1159         @mkdir -p $(MODLIB)/kernel
1160         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1161         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1162                 rm -f $(MODLIB)/build ; \
1163                 ln -s $(CURDIR) $(MODLIB)/build ; \
1164         fi
1165         @cp -f $(objtree)/modules.order $(MODLIB)/
1166         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1167         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1168
1169 # This depmod is only for convenience to give the initial
1170 # boot a modules.dep even before / is mounted read-write.  However the
1171 # boot script depmod is the master version.
1172 PHONY += _modinst_post
1173 _modinst_post: _modinst_
1174         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1175         $(call cmd,depmod)
1176
1177 ifeq ($(CONFIG_MODULE_SIG), y)
1178 PHONY += modules_sign
1179 modules_sign:
1180         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1181 endif
1182
1183 else # CONFIG_MODULES
1184
1185 # Modules not configured
1186 # ---------------------------------------------------------------------------
1187
1188 modules modules_install: FORCE
1189         @echo >&2
1190         @echo >&2 "The present kernel configuration has modules disabled."
1191         @echo >&2 "Type 'make config' and enable loadable module support."
1192         @echo >&2 "Then build a kernel with module support enabled."
1193         @echo >&2
1194         @exit 1
1195
1196 endif # CONFIG_MODULES
1197
1198 ###
1199 # Cleaning is done on three levels.
1200 # make clean     Delete most generated files
1201 #                Leave enough to build external modules
1202 # make mrproper  Delete the current configuration, and all generated files
1203 # make distclean Remove editor backup files, patch leftover files and the like
1204
1205 # Directories & files removed with 'make clean'
1206 CLEAN_DIRS  += $(MODVERDIR)
1207
1208 # Directories & files removed with 'make mrproper'
1209 MRPROPER_DIRS  += include/config usr/include include/generated          \
1210                   arch/*/include/generated .tmp_objdiff
1211 MRPROPER_FILES += .config .config.old .version .old_version \
1212                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1213                   signing_key.pem signing_key.priv signing_key.x509     \
1214                   x509.genkey extra_certificates signing_key.x509.keyid \
1215                   signing_key.x509.signer vmlinux-gdb.py
1216
1217 # clean - Delete most, but leave enough to build external modules
1218 #
1219 clean: rm-dirs  := $(CLEAN_DIRS)
1220 clean: rm-files := $(CLEAN_FILES)
1221 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1222
1223 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1224 $(clean-dirs):
1225         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1226
1227 vmlinuxclean:
1228         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1229
1230 clean: archclean vmlinuxclean
1231
1232 # mrproper - Delete all generated files, including .config
1233 #
1234 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1235 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1236 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1237
1238 PHONY += $(mrproper-dirs) mrproper archmrproper
1239 $(mrproper-dirs):
1240         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1241
1242 mrproper: clean archmrproper $(mrproper-dirs)
1243         $(call cmd,rmdirs)
1244         $(call cmd,rmfiles)
1245
1246 # distclean
1247 #
1248 PHONY += distclean
1249
1250 distclean: mrproper
1251         @find $(srctree) $(RCS_FIND_IGNORE) \
1252                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1253                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1254                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1255                 -type f -print | xargs rm -f
1256
1257
1258 # Packaging of the kernel to various formats
1259 # ---------------------------------------------------------------------------
1260 # rpm target kept for backward compatibility
1261 package-dir     := scripts/package
1262
1263 %src-pkg: FORCE
1264         $(Q)$(MAKE) $(build)=$(package-dir) $@
1265 %pkg: include/config/kernel.release FORCE
1266         $(Q)$(MAKE) $(build)=$(package-dir) $@
1267 rpm: include/config/kernel.release FORCE
1268         $(Q)$(MAKE) $(build)=$(package-dir) $@
1269
1270
1271 # Brief documentation of the typical targets used
1272 # ---------------------------------------------------------------------------
1273
1274 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1275 boards := $(sort $(notdir $(boards)))
1276 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1277 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1278
1279 help:
1280         @echo  'Cleaning targets:'
1281         @echo  '  clean           - Remove most generated files but keep the config and'
1282         @echo  '                    enough build support to build external modules'
1283         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1284         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1285         @echo  ''
1286         @echo  'Configuration targets:'
1287         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1288         @echo  ''
1289         @echo  'Other generic targets:'
1290         @echo  '  all             - Build all targets marked with [*]'
1291         @echo  '* vmlinux         - Build the bare kernel'
1292         @echo  '* modules         - Build all modules'
1293         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1294         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1295         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1296         @echo  '  dir/            - Build all files in dir and below'
1297         @echo  '  dir/file.[ois]  - Build specified target only'
1298         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1299         @echo  '                    (requires a recent binutils and recent build (System.map))'
1300         @echo  '  dir/file.ko     - Build module including final link'
1301         @echo  '  modules_prepare - Set up for building external modules'
1302         @echo  '  tags/TAGS       - Generate tags file for editors'
1303         @echo  '  cscope          - Generate cscope index'
1304         @echo  '  gtags           - Generate GNU GLOBAL index'
1305         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1306         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1307         @echo  '  image_name      - Output the image name (use with make -s)'
1308         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1309          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1310          echo  ''
1311         @echo  'Static analysers'
1312         @echo  '  checkstack      - Generate a list of stack hogs'
1313         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1314         @echo  '  versioncheck    - Sanity check on version.h usage'
1315         @echo  '  includecheck    - Check for duplicate included header files'
1316         @echo  '  export_report   - List the usages of all exported symbols'
1317         @echo  '  headers_check   - Sanity check on exported headers'
1318         @echo  '  headerdep       - Detect inclusion cycles in headers'
1319         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1320         @echo  ''
1321         @echo  'Kernel selftest'
1322         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1323         @echo  '                    Build, install, and boot kernel before'
1324         @echo  '                    running kselftest on it'
1325         @echo  '  kselftest-clean - Remove all generated kselftest files'
1326         @echo  ''
1327         @echo  'Kernel packaging:'
1328         @$(MAKE) $(build)=$(package-dir) help
1329         @echo  ''
1330         @echo  'Documentation targets:'
1331         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1332         @echo  ''
1333         @echo  'Architecture specific targets ($(SRCARCH)):'
1334         @$(if $(archhelp),$(archhelp),\
1335                 echo '  No architecture specific help defined for $(SRCARCH)')
1336         @echo  ''
1337         @$(if $(boards), \
1338                 $(foreach b, $(boards), \
1339                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1340                 echo '')
1341         @$(if $(board-dirs), \
1342                 $(foreach b, $(board-dirs), \
1343                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1344                 printf "  %-16s - Show all of the above\\n" help-boards; \
1345                 echo '')
1346
1347         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1348         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1349         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1350         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1351         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1352         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1353         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1354         @echo  '                1: warnings which may be relevant and do not occur too often'
1355         @echo  '                2: warnings which occur quite often but may still be relevant'
1356         @echo  '                3: more obscure warnings, can most likely be ignored'
1357         @echo  '                Multiple levels can be combined with W=12 or W=123'
1358         @echo  ''
1359         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1360         @echo  'For further info see the ./README file'
1361
1362
1363 help-board-dirs := $(addprefix help-,$(board-dirs))
1364
1365 help-boards: $(help-board-dirs)
1366
1367 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1368
1369 $(help-board-dirs): help-%:
1370         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1371         @$(if $(boards-per-dir), \
1372                 $(foreach b, $(boards-per-dir), \
1373                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1374                 echo '')
1375
1376
1377 # Documentation targets
1378 # ---------------------------------------------------------------------------
1379 %docs: scripts_basic FORCE
1380         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1381         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1382
1383 else # KBUILD_EXTMOD
1384
1385 ###
1386 # External module support.
1387 # When building external modules the kernel used as basis is considered
1388 # read-only, and no consistency checks are made and the make
1389 # system is not used on the basis kernel. If updates are required
1390 # in the basis kernel ordinary make commands (without M=...) must
1391 # be used.
1392 #
1393 # The following are the only valid targets when building external
1394 # modules.
1395 # make M=dir clean     Delete all automatically generated files
1396 # make M=dir modules   Make all modules in specified dir
1397 # make M=dir           Same as 'make M=dir modules'
1398 # make M=dir modules_install
1399 #                      Install the modules built in the module directory
1400 #                      Assumes install directory is already created
1401
1402 # We are always building modules
1403 KBUILD_MODULES := 1
1404 PHONY += crmodverdir
1405 crmodverdir:
1406         $(cmd_crmodverdir)
1407
1408 PHONY += $(objtree)/Module.symvers
1409 $(objtree)/Module.symvers:
1410         @test -e $(objtree)/Module.symvers || ( \
1411         echo; \
1412         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1413         echo "           is missing; modules will have no dependencies and modversions."; \
1414         echo )
1415
1416 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1417 PHONY += $(module-dirs) modules
1418 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1419         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1420
1421 modules: $(module-dirs)
1422         @$(kecho) '  Building modules, stage 2.';
1423         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1424
1425 PHONY += modules_install
1426 modules_install: _emodinst_ _emodinst_post
1427
1428 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1429 PHONY += _emodinst_
1430 _emodinst_:
1431         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1432         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1433
1434 PHONY += _emodinst_post
1435 _emodinst_post: _emodinst_
1436         $(call cmd,depmod)
1437
1438 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1439
1440 PHONY += $(clean-dirs) clean
1441 $(clean-dirs):
1442         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1443
1444 clean:  rm-dirs := $(MODVERDIR)
1445 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1446
1447 help:
1448         @echo  '  Building external modules.'
1449         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1450         @echo  ''
1451         @echo  '  modules         - default target, build the module(s)'
1452         @echo  '  modules_install - install the module'
1453         @echo  '  clean           - remove generated files in module directory only'
1454         @echo  ''
1455
1456 # Dummies...
1457 PHONY += prepare scripts
1458 prepare: ;
1459 scripts: ;
1460 endif # KBUILD_EXTMOD
1461
1462 clean: $(clean-dirs)
1463         $(call cmd,rmdirs)
1464         $(call cmd,rmfiles)
1465         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1466                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1467                 -o -name '*.ko.*' \
1468                 -o -name '*.dwo'  \
1469                 -o -name '*.su'  \
1470                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1471                 -o -name '*.symtypes' -o -name 'modules.order' \
1472                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1473                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1474
1475 # Generate tags for editors
1476 # ---------------------------------------------------------------------------
1477 quiet_cmd_tags = GEN     $@
1478       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1479
1480 tags TAGS cscope gtags: FORCE
1481         $(call cmd,tags)
1482
1483 # Scripts to check various things for consistency
1484 # ---------------------------------------------------------------------------
1485
1486 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1487
1488 includecheck:
1489         find $(srctree)/* $(RCS_FIND_IGNORE) \
1490                 -name '*.[hcS]' -type f -print | sort \
1491                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1492
1493 versioncheck:
1494         find $(srctree)/* $(RCS_FIND_IGNORE) \
1495                 -name '*.[hcS]' -type f -print | sort \
1496                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1497
1498 coccicheck:
1499         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1500
1501 namespacecheck:
1502         $(PERL) $(srctree)/scripts/namespace.pl
1503
1504 export_report:
1505         $(PERL) $(srctree)/scripts/export_report.pl
1506
1507 endif #ifeq ($(config-targets),1)
1508 endif #ifeq ($(mixed-targets),1)
1509
1510 PHONY += checkstack kernelrelease kernelversion image_name
1511
1512 # UML needs a little special treatment here.  It wants to use the host
1513 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1514 # else wants $(ARCH), including people doing cross-builds, which means
1515 # that $(SUBARCH) doesn't work here.
1516 ifeq ($(ARCH), um)
1517 CHECKSTACK_ARCH := $(SUBARCH)
1518 else
1519 CHECKSTACK_ARCH := $(ARCH)
1520 endif
1521 checkstack:
1522         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1523         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1524
1525 kernelrelease:
1526         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1527
1528 kernelversion:
1529         @echo $(KERNELVERSION)
1530
1531 image_name:
1532         @echo $(KBUILD_IMAGE)
1533
1534 # Clear a bunch of variables before executing the submake
1535 tools/: FORCE
1536         $(Q)mkdir -p $(objtree)/tools
1537         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1538
1539 tools/%: FORCE
1540         $(Q)mkdir -p $(objtree)/tools
1541         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1542
1543 # Single targets
1544 # ---------------------------------------------------------------------------
1545 # Single targets are compatible with:
1546 # - build with mixed source and output
1547 # - build with separate output dir 'make O=...'
1548 # - external modules
1549 #
1550 #  target-dir => where to store outputfile
1551 #  build-dir  => directory in kernel source tree to use
1552
1553 ifeq ($(KBUILD_EXTMOD),)
1554         build-dir  = $(patsubst %/,%,$(dir $@))
1555         target-dir = $(dir $@)
1556 else
1557         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1558         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1559         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1560 endif
1561
1562 %.s: %.c prepare scripts FORCE
1563         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1564 %.i: %.c prepare scripts FORCE
1565         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1566 %.o: %.c prepare scripts FORCE
1567         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1568 %.lst: %.c prepare scripts FORCE
1569         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1570 %.s: %.S prepare scripts FORCE
1571         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1572 %.o: %.S prepare scripts FORCE
1573         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1574 %.symtypes: %.c prepare scripts FORCE
1575         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1576
1577 # Modules
1578 /: prepare scripts FORCE
1579         $(cmd_crmodverdir)
1580         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1581         $(build)=$(build-dir)
1582 # Make sure the latest headers are built for Documentation
1583 Documentation/: headers_install
1584 %/: prepare scripts FORCE
1585         $(cmd_crmodverdir)
1586         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1587         $(build)=$(build-dir)
1588 %.ko: prepare scripts FORCE
1589         $(cmd_crmodverdir)
1590         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1591         $(build)=$(build-dir) $(@:.ko=.o)
1592         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1593
1594 # FIXME Should go into a make.lib or something
1595 # ===========================================================================
1596
1597 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1598       cmd_rmdirs = rm -rf $(rm-dirs)
1599
1600 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1601       cmd_rmfiles = rm -f $(rm-files)
1602
1603 # Run depmod only if we have System.map and depmod is executable
1604 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1605       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1606                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1607
1608 # Create temporary dir for module support files
1609 # clean it up only when building all modules
1610 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1611                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1612
1613 # read all saved command lines
1614
1615 targets := $(wildcard $(sort $(targets)))
1616 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1617
1618 ifneq ($(cmd_files),)
1619   $(cmd_files): ;       # Do not try to update included dependency files
1620   include $(cmd_files)
1621 endif
1622
1623 endif   # skip-makefile
1624
1625 PHONY += FORCE
1626 FORCE:
1627
1628 # Declare the contents of the .PHONY variable as phony.  We keep that
1629 # information in a variable so we can use it in if_changed and friends.
1630 .PHONY: $(PHONY)