Makefile

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