Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 4
   3 SUBLEVEL = 150
   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
 422 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE
 423 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 424 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 425 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 426 export KBUILD_ARFLAGS
 427
 428 # When compiling out-of-tree modules, put MODVERDIR in the module
 429 # tree rather than in the kernel tree. The kernel tree might
 430 # even be read-only.
 431 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 432
 433 # Files to ignore in find ... statements
 434
 435 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 436                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 437                           -prune -o
 438 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 439                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 440
 441 # ===========================================================================
 442 # Rules shared between *config targets and build targets
 443
 444 # Basic helpers built in scripts/
 445 PHONY += scripts_basic
 446 scripts_basic:
 447         $(Q)$(MAKE) $(build)=scripts/basic
 448         $(Q)rm -f .tmp_quiet_recordmcount
 449
 450 # To avoid any implicit rule to kick in, define an empty command.
 451 scripts/basic/%: scripts_basic ;
 452
 453 PHONY += outputmakefile
 454 # outputmakefile generates a Makefile in the output directory, if using a
 455 # separate output directory. This allows convenient use of make in the
 456 # output directory.
 457 outputmakefile:
 458 ifneq ($(KBUILD_SRC),)
 459         $(Q)ln -fsn $(srctree) source
 460         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 461             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 462 endif
 463
 464 # Support for using generic headers in asm-generic
 465 PHONY += asm-generic
 466 asm-generic:
 467         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 468                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 469         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 470                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 471
 472 # To make sure we do not include .config for any of the *config targets
 473 # catch them early, and hand them over to scripts/kconfig/Makefile
 474 # It is allowed to specify more targets when calling make, including
 475 # mixing *config targets and build targets.
 476 # For example 'make oldconfig all'.
 477 # Detect when mixed targets is specified, and make a second invocation
 478 # of make so .config is not included in this case either (for *config).
 479
 480 version_h := include/generated/uapi/linux/version.h
 481 old_version_h := include/linux/version.h
 482
 483 no-dot-config-targets := clean mrproper distclean \
 484                          cscope gtags TAGS tags help% %docs check% coccicheck \
 485                          $(version_h) headers_% archheaders archscripts \
 486                          kernelversion %src-pkg
 487
 488 config-targets := 0
 489 mixed-targets  := 0
 490 dot-config     := 1
 491
 492 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 493         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 494                 dot-config := 0
 495         endif
 496 endif
 497
 498 ifeq ($(KBUILD_EXTMOD),)
 499         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 500                 config-targets := 1
 501                 ifneq ($(words $(MAKECMDGOALS)),1)
 502                         mixed-targets := 1
 503                 endif
 504         endif
 505 endif
 506 # install and module_install need also be processed one by one
 507 ifneq ($(filter install,$(MAKECMDGOALS)),)
 508         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 509                 mixed-targets := 1
 510         endif
 511 endif
 512
 513 ifeq ($(mixed-targets),1)
 514 # ===========================================================================
 515 # We're called with mixed targets (*config and build targets).
 516 # Handle them one by one.
 517
 518 PHONY += $(MAKECMDGOALS) __build_one_by_one
 519
 520 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 521         @:
 522
 523 __build_one_by_one:
 524         $(Q)set -e; \
 525         for i in $(MAKECMDGOALS); do \
 526                 $(MAKE) -f $(srctree)/Makefile $$i; \
 527         done
 528
 529 else
 530 ifeq ($(config-targets),1)
 531 # ===========================================================================
 532 # *config targets only - make sure prerequisites are updated, and descend
 533 # in scripts/kconfig to make the *config target
 534
 535 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 536 # KBUILD_DEFCONFIG may point out an alternative default configuration
 537 # used for 'make defconfig'
 538 include arch/$(SRCARCH)/Makefile
 539 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 540
 541 config: scripts_basic outputmakefile FORCE
 542         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 543
 544 %config: scripts_basic outputmakefile FORCE
 545         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 546
 547 else
 548 # ===========================================================================
 549 # Build targets only - this includes vmlinux, arch specific targets, clean
 550 # targets and others. In general all targets except *config targets.
 551
 552 ifeq ($(KBUILD_EXTMOD),)
 553 # Additional helpers built in scripts/
 554 # Carefully list dependencies so we do not try to build scripts twice
 555 # in parallel
 556 PHONY += scripts
 557 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 558          asm-generic
 559         $(Q)$(MAKE) $(build)=$(@)
 560
 561 # Objects we will link into vmlinux / subdirs we need to visit
 562 init-y          := init/
 563 drivers-y       := drivers/ sound/ firmware/
 564 net-y           := net/
 565 libs-y          := lib/
 566 core-y          := usr/
 567 virt-y          := virt/
 568 endif # KBUILD_EXTMOD
 569
 570 ifeq ($(dot-config),1)
 571 # Read in config
 572 -include include/config/auto.conf
 573
 574 ifeq ($(KBUILD_EXTMOD),)
 575 # Read in dependencies to all Kconfig* files, make sure to run
 576 # oldconfig if changes are detected.
 577 -include include/config/auto.conf.cmd
 578
 579 # To avoid any implicit rule to kick in, define an empty command
 580 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 581
 582 # If .config is newer than include/config/auto.conf, someone tinkered
 583 # with it and forgot to run make oldconfig.
 584 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 585 # we execute the config step to be sure to catch updated Kconfig files
 586 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 587         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 588 else
 589 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 590 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 591 PHONY += include/config/auto.conf
 592
 593 include/config/auto.conf:
 594         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 595         echo >&2;                                                       \
 596         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 597         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 598         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 599         echo >&2 ;                                                      \
 600         /bin/false)
 601
 602 endif # KBUILD_EXTMOD
 603
 604 else
 605 # Dummy target needed, because used as prerequisite
 606 include/config/auto.conf: ;
 607 endif # $(dot-config)
 608
 609 # The all: target is the default when no target is given on the
 610 # command line.
 611 # This allow a user to issue only 'make' to build a kernel including modules
 612 # Defaults to vmlinux, but the arch makefile usually adds further targets
 613 all: vmlinux
 614
 615 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 616 # values of the respective KBUILD_* variables
 617 ARCH_CPPFLAGS :=
 618 ARCH_AFLAGS :=
 619 ARCH_CFLAGS :=
 620 include arch/$(SRCARCH)/Makefile
 621
 622 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 623 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 624 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 625 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 626 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 627 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 628 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 629
 630 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 631 KBUILD_CFLAGS   += -Os
 632 else
 633 ifdef CONFIG_PROFILE_ALL_BRANCHES
 634 KBUILD_CFLAGS   += -O2
 635 else
 636 KBUILD_CFLAGS   += -O2
 637 endif
 638 endif
 639
 640 # Tell gcc to never replace conditional load with a non-conditional one
 641 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 642
 643 # check for 'asm goto'
 644 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 645         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 646         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 647 endif
 648
 649 ifdef CONFIG_READABLE_ASM
 650 # Disable optimizations that make assembler listings hard to read.
 651 # reorder blocks reorders the control in the function
 652 # ipa clone creates specialized cloned functions
 653 # partial inlining inlines only parts of functions
 654 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 655                  $(call cc-option,-fno-ipa-cp-clone,) \
 656                  $(call cc-option,-fno-partial-inlining)
 657 endif
 658
 659 ifneq ($(CONFIG_FRAME_WARN),0)
 660 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 661 endif
 662
 663 # Handle stack protector mode.
 664 #
 665 # Since kbuild can potentially perform two passes (first with the old
 666 # .config values and then with updated .config values), we cannot error out
 667 # if a desired compiler option is unsupported. If we were to error, kbuild
 668 # could never get to the second pass and actually notice that we changed
 669 # the option to something that was supported.
 670 #
 671 # Additionally, we don't want to fallback and/or silently change which compiler
 672 # flags will be used, since that leads to producing kernels with different
 673 # security feature characteristics depending on the compiler used. ("But I
 674 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
 675 #
 676 # The middle ground is to warn here so that the failed option is obvious, but
 677 # to let the build fail with bad compiler flags so that we can't produce a
 678 # kernel when there is a CONFIG and compiler mismatch.
 679 #
 680 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 681   stackp-flag := -fstack-protector
 682   ifeq ($(call cc-option, $(stackp-flag)),)
 683     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
 684              -fstack-protector not supported by compiler)
 685   endif
 686 else
 687 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 688   stackp-flag := -fstack-protector-strong
 689   ifeq ($(call cc-option, $(stackp-flag)),)
 690     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 691               -fstack-protector-strong not supported by compiler)
 692   endif
 693 else
 694   # Force off for distro compilers that enable stack protector by default.
 695   stackp-flag := $(call cc-option, -fno-stack-protector)
 696 endif
 697 endif
 698 KBUILD_CFLAGS += $(stackp-flag)
 699
 700 ifeq ($(cc-name),clang)
 701 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 702 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 703 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 704 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 705 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 706 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 707 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 708 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 709 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 710 # See modpost pattern 2
 711 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 712 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 713 else
 714
 715 # These warnings generated too much noise in a regular build.
 716 # Use make W=1 to enable them (see scripts/Makefile.build)
 717 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 718 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 719 endif
 720
 721 ifdef CONFIG_FRAME_POINTER
 722 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 723 else
 724 # Some targets (ARM with Thumb2, for example), can't be built with frame
 725 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 726 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 727 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 728 # -fomit-frame-pointer with FUNCTION_TRACER.
 729 ifndef CONFIG_FUNCTION_TRACER
 730 KBUILD_CFLAGS   += -fomit-frame-pointer
 731 endif
 732 endif
 733
 734 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 735
 736 ifdef CONFIG_DEBUG_INFO
 737 ifdef CONFIG_DEBUG_INFO_SPLIT
 738 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 739 else
 740 KBUILD_CFLAGS   += -g
 741 endif
 742 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 743 endif
 744 ifdef CONFIG_DEBUG_INFO_DWARF4
 745 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 746 endif
 747
 748 ifdef CONFIG_DEBUG_INFO_REDUCED
 749 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 750                    $(call cc-option,-fno-var-tracking)
 751 endif
 752
 753 ifdef CONFIG_FUNCTION_TRACER
 754 ifndef CC_FLAGS_FTRACE
 755 CC_FLAGS_FTRACE := -pg
 756 endif
 757 export CC_FLAGS_FTRACE
 758 ifdef CONFIG_HAVE_FENTRY
 759 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 760 endif
 761 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 762 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 763 ifdef CONFIG_DYNAMIC_FTRACE
 764         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 765                 BUILD_C_RECORDMCOUNT := y
 766                 export BUILD_C_RECORDMCOUNT
 767         endif
 768 endif
 769 endif
 770
 771 # We trigger additional mismatches with less inlining
 772 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 773 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 774 endif
 775
 776 # arch Makefile may override CC so keep this after arch Makefile is included
 777 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 778 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 779
 780 # warn about C99 declaration after statement
 781 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 782
 783 # disable pointer signed / unsigned warnings in gcc 4.0
 784 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 785
 786 # disable invalid "can't wrap" optimizations for signed / pointers
 787 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 788
 789 # clang sets -fmerge-all-constants by default as optimization, but this
 790 # is non-conforming behavior for C and in fact breaks the kernel, so we
 791 # need to disable it here generally.
 792 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 793
 794 # for gcc -fno-merge-all-constants disables everything, but it is fine
 795 # to have actual conforming behavior enabled.
 796 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 797
 798 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 799 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 800
 801 # conserve stack if available
 802 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 803
 804 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 805 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 806
 807 # require functions to have arguments in prototypes, not empty 'int foo()'
 808 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 809
 810 # Prohibit date/time macros, which would make the build non-deterministic
 811 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 812
 813 # use the deterministic mode of AR if available
 814 KBUILD_ARFLAGS := $(call ar-option,D)
 815
 816 include scripts/Makefile.kasan
 817 include scripts/Makefile.extrawarn
 818
 819 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 820 # last assignments
 821 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 822 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 823 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 824
 825 # Use --build-id when available.
 826 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 827                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 828 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 829 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 830
 831 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 832 LDFLAGS_vmlinux += $(call ld-option, -X,)
 833 endif
 834
 835 # Default kernel image to build when no specific target is given.
 836 # KBUILD_IMAGE may be overruled on the command line or
 837 # set in the environment
 838 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 839 # this default value
 840 export KBUILD_IMAGE ?= vmlinux
 841
 842 #
 843 # INSTALL_PATH specifies where to place the updated kernel and system map
 844 # images. Default is /boot, but you can set it to other values
 845 export  INSTALL_PATH ?= /boot
 846
 847 #
 848 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 849 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 850 # an argument if needed. Otherwise it defaults to the kernel install path
 851 #
 852 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 853
 854 #
 855 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 856 # relocations required by build roots.  This is not defined in the
 857 # makefile but the argument can be passed to make if needed.
 858 #
 859
 860 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 861 export MODLIB
 862
 863 #
 864 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 865 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 866 # the default option --strip-debug will be used.  Otherwise,
 867 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 868
 869 ifdef INSTALL_MOD_STRIP
 870 ifeq ($(INSTALL_MOD_STRIP),1)
 871 mod_strip_cmd = $(STRIP) --strip-debug
 872 else
 873 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 874 endif # INSTALL_MOD_STRIP=1
 875 else
 876 mod_strip_cmd = true
 877 endif # INSTALL_MOD_STRIP
 878 export mod_strip_cmd
 879
 880 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 881 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 882 # or CONFIG_MODULE_COMPRESS_XZ.
 883
 884 mod_compress_cmd = true
 885 ifdef CONFIG_MODULE_COMPRESS
 886   ifdef CONFIG_MODULE_COMPRESS_GZIP
 887     mod_compress_cmd = gzip -n -f
 888   endif # CONFIG_MODULE_COMPRESS_GZIP
 889   ifdef CONFIG_MODULE_COMPRESS_XZ
 890     mod_compress_cmd = xz -f
 891   endif # CONFIG_MODULE_COMPRESS_XZ
 892 endif # CONFIG_MODULE_COMPRESS
 893 export mod_compress_cmd
 894
 895 # Select initial ramdisk compression format, default is gzip(1).
 896 # This shall be used by the dracut(8) tool while creating an initramfs image.
 897 #
 898 INITRD_COMPRESS-y                  := gzip
 899 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 900 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 901 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 902 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 903 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 904 # do not export INITRD_COMPRESS, since we didn't actually
 905 # choose a sane default compression above.
 906 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 907
 908 ifdef CONFIG_MODULE_SIG_ALL
 909 $(eval $(call config_filename,MODULE_SIG_KEY))
 910
 911 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 912 else
 913 mod_sign_cmd = true
 914 endif
 915 export mod_sign_cmd
 916
 917
 918 ifeq ($(KBUILD_EXTMOD),)
 919 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 920
 921 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 922                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 923                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 924
 925 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 926                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 927
 928 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 929 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 930 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 931 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 932 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 933 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 934 libs-y          := $(libs-y1) $(libs-y2)
 935 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 936
 937 # Externally visible symbols (used by link-vmlinux.sh)
 938 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 939 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 940 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 941 export LDFLAGS_vmlinux
 942 # used by scripts/pacmage/Makefile
 943 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 944
 945 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 946
 947 # Final link of vmlinux
 948       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 949 quiet_cmd_link-vmlinux = LINK    $@
 950
 951 # Include targets which we want to
 952 # execute if the rest of the kernel build went well.
 953 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 954 ifdef CONFIG_HEADERS_CHECK
 955         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 956 endif
 957 ifdef CONFIG_SAMPLES
 958         $(Q)$(MAKE) $(build)=samples
 959 endif
 960 ifdef CONFIG_BUILD_DOCSRC
 961         $(Q)$(MAKE) $(build)=Documentation
 962 endif
 963 ifdef CONFIG_GDB_SCRIPTS
 964         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 965 endif
 966         +$(call if_changed,link-vmlinux)
 967
 968 # The actual objects are generated when descending,
 969 # make sure no implicit rule kicks in
 970 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 971
 972 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 973 # Preset locale variables to speed up the build process. Limit locale
 974 # tweaks to this spot to avoid wrong language settings when running
 975 # make menuconfig etc.
 976 # Error messages still appears in the original language
 977
 978 PHONY += $(vmlinux-dirs)
 979 $(vmlinux-dirs): prepare scripts
 980         $(Q)$(MAKE) $(build)=$@
 981
 982 define filechk_kernel.release
 983         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 984 endef
 985
 986 # Store (new) KERNELRELEASE string in include/config/kernel.release
 987 include/config/kernel.release: include/config/auto.conf FORCE
 988         $(call filechk,kernel.release)
 989
 990
 991 # Things we need to do before we recursively start building the kernel
 992 # or the modules are listed in "prepare".
 993 # A multi level approach is used. prepareN is processed before prepareN-1.
 994 # archprepare is used in arch Makefiles and when processed asm symlink,
 995 # version.h and scripts_basic is processed / created.
 996
 997 # Listed in dependency order
 998 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 999
1000 # prepare3 is used to check if we are building in a separate output directory,
1001 # and if so do:
1002 # 1) Check that make has not been executed in the kernel src $(srctree)
1003 prepare3: include/config/kernel.release
1004 ifneq ($(KBUILD_SRC),)
1005         @$(kecho) '  Using $(srctree) as source for kernel'
1006         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1007                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1008                 echo >&2 "  in the '$(srctree)' directory.";\
1009                 /bin/false; \
1010         fi;
1011 endif
1012
1013 # prepare2 creates a makefile if using a separate output directory
1014 prepare2: prepare3 outputmakefile asm-generic
1015
1016 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1017                    include/config/auto.conf
1018         $(cmd_crmodverdir)
1019
1020 archprepare: archheaders archscripts prepare1 scripts_basic
1021
1022 prepare0: archprepare FORCE
1023         $(Q)$(MAKE) $(build)=.
1024
1025 # All the preparing..
1026 prepare: prepare0
1027
1028 # Generate some files
1029 # ---------------------------------------------------------------------------
1030
1031 # KERNELRELEASE can change from a few different places, meaning version.h
1032 # needs to be updated, so this check is forced on all builds
1033
1034 uts_len := 64
1035 define filechk_utsrelease.h
1036         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1037           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1038           exit 1;                                                         \
1039         fi;                                                               \
1040         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1041 endef
1042
1043 define filechk_version.h
1044         (echo \#define LINUX_VERSION_CODE $(shell                         \
1045         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1046         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1047 endef
1048
1049 $(version_h): $(srctree)/Makefile FORCE
1050         $(call filechk,version.h)
1051         $(Q)rm -f $(old_version_h)
1052
1053 include/generated/utsrelease.h: include/config/kernel.release FORCE
1054         $(call filechk,utsrelease.h)
1055
1056 PHONY += headerdep
1057 headerdep:
1058         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1059         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1060
1061 # ---------------------------------------------------------------------------
1062 # Firmware install
1063 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1064 export INSTALL_FW_PATH
1065
1066 PHONY += firmware_install
1067 firmware_install: FORCE
1068         @mkdir -p $(objtree)/firmware
1069         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1070
1071 # ---------------------------------------------------------------------------
1072 # Kernel headers
1073
1074 #Default location for installed headers
1075 export INSTALL_HDR_PATH = $(objtree)/usr
1076
1077 # If we do an all arch process set dst to asm-$(hdr-arch)
1078 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1079
1080 PHONY += archheaders
1081 archheaders:
1082
1083 PHONY += archscripts
1084 archscripts:
1085
1086 PHONY += __headers
1087 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1088         $(Q)$(MAKE) $(build)=scripts build_unifdef
1089
1090 PHONY += headers_install_all
1091 headers_install_all:
1092         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1093
1094 PHONY += headers_install
1095 headers_install: __headers
1096         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1097           $(error Headers not exportable for the $(SRCARCH) architecture))
1098         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1099         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1100
1101 PHONY += headers_check_all
1102 headers_check_all: headers_install_all
1103         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1104
1105 PHONY += headers_check
1106 headers_check: headers_install
1107         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1108         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1109
1110 # ---------------------------------------------------------------------------
1111 # Kernel selftest
1112
1113 PHONY += kselftest
1114 kselftest:
1115         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1116
1117 kselftest-clean:
1118         $(Q)$(MAKE) -C tools/testing/selftests clean
1119
1120 # ---------------------------------------------------------------------------
1121 # Modules
1122
1123 ifdef CONFIG_MODULES
1124
1125 # By default, build modules as well
1126
1127 all: modules
1128
1129 # Build modules
1130 #
1131 # A module can be listed more than once in obj-m resulting in
1132 # duplicate lines in modules.order files.  Those are removed
1133 # using awk while concatenating to the final file.
1134
1135 PHONY += modules
1136 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1137         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1138         @$(kecho) '  Building modules, stage 2.';
1139         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1140         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1141
1142 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1143         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1144
1145 %/modules.builtin: include/config/auto.conf
1146         $(Q)$(MAKE) $(modbuiltin)=$*
1147
1148
1149 # Target to prepare building external modules
1150 PHONY += modules_prepare
1151 modules_prepare: prepare scripts
1152
1153 # Target to install modules
1154 PHONY += modules_install
1155 modules_install: _modinst_ _modinst_post
1156
1157 PHONY += _modinst_
1158 _modinst_:
1159         @rm -rf $(MODLIB)/kernel
1160         @rm -f $(MODLIB)/source
1161         @mkdir -p $(MODLIB)/kernel
1162         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1163         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1164                 rm -f $(MODLIB)/build ; \
1165                 ln -s $(CURDIR) $(MODLIB)/build ; \
1166         fi
1167         @cp -f $(objtree)/modules.order $(MODLIB)/
1168         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1169         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1170
1171 # This depmod is only for convenience to give the initial
1172 # boot a modules.dep even before / is mounted read-write.  However the
1173 # boot script depmod is the master version.
1174 PHONY += _modinst_post
1175 _modinst_post: _modinst_
1176         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1177         $(call cmd,depmod)
1178
1179 ifeq ($(CONFIG_MODULE_SIG), y)
1180 PHONY += modules_sign
1181 modules_sign:
1182         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1183 endif
1184
1185 else # CONFIG_MODULES
1186
1187 # Modules not configured
1188 # ---------------------------------------------------------------------------
1189
1190 modules modules_install: FORCE
1191         @echo >&2
1192         @echo >&2 "The present kernel configuration has modules disabled."
1193         @echo >&2 "Type 'make config' and enable loadable module support."
1194         @echo >&2 "Then build a kernel with module support enabled."
1195         @echo >&2
1196         @exit 1
1197
1198 endif # CONFIG_MODULES
1199
1200 ###
1201 # Cleaning is done on three levels.
1202 # make clean     Delete most generated files
1203 #                Leave enough to build external modules
1204 # make mrproper  Delete the current configuration, and all generated files
1205 # make distclean Remove editor backup files, patch leftover files and the like
1206
1207 # Directories & files removed with 'make clean'
1208 CLEAN_DIRS  += $(MODVERDIR)
1209
1210 # Directories & files removed with 'make mrproper'
1211 MRPROPER_DIRS  += include/config usr/include include/generated          \
1212                   arch/*/include/generated .tmp_objdiff
1213 MRPROPER_FILES += .config .config.old .version .old_version \
1214                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1215                   signing_key.pem signing_key.priv signing_key.x509     \
1216                   x509.genkey extra_certificates signing_key.x509.keyid \
1217                   signing_key.x509.signer vmlinux-gdb.py
1218
1219 # clean - Delete most, but leave enough to build external modules
1220 #
1221 clean: rm-dirs  := $(CLEAN_DIRS)
1222 clean: rm-files := $(CLEAN_FILES)
1223 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1224
1225 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1226 $(clean-dirs):
1227         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1228
1229 vmlinuxclean:
1230         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1231
1232 clean: archclean vmlinuxclean
1233
1234 # mrproper - Delete all generated files, including .config
1235 #
1236 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1237 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1238 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1239
1240 PHONY += $(mrproper-dirs) mrproper archmrproper
1241 $(mrproper-dirs):
1242         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1243
1244 mrproper: clean archmrproper $(mrproper-dirs)
1245         $(call cmd,rmdirs)
1246         $(call cmd,rmfiles)
1247
1248 # distclean
1249 #
1250 PHONY += distclean
1251
1252 distclean: mrproper
1253         @find $(srctree) $(RCS_FIND_IGNORE) \
1254                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1255                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1256                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1257                 -type f -print | xargs rm -f
1258
1259
1260 # Packaging of the kernel to various formats
1261 # ---------------------------------------------------------------------------
1262 # rpm target kept for backward compatibility
1263 package-dir     := scripts/package
1264
1265 %src-pkg: FORCE
1266         $(Q)$(MAKE) $(build)=$(package-dir) $@
1267 %pkg: include/config/kernel.release FORCE
1268         $(Q)$(MAKE) $(build)=$(package-dir) $@
1269 rpm: include/config/kernel.release FORCE
1270         $(Q)$(MAKE) $(build)=$(package-dir) $@
1271
1272
1273 # Brief documentation of the typical targets used
1274 # ---------------------------------------------------------------------------
1275
1276 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1277 boards := $(sort $(notdir $(boards)))
1278 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1279 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1280
1281 help:
1282         @echo  'Cleaning targets:'
1283         @echo  '  clean           - Remove most generated files but keep the config and'
1284         @echo  '                    enough build support to build external modules'
1285         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1286         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1287         @echo  ''
1288         @echo  'Configuration targets:'
1289         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1290         @echo  ''
1291         @echo  'Other generic targets:'
1292         @echo  '  all             - Build all targets marked with [*]'
1293         @echo  '* vmlinux         - Build the bare kernel'
1294         @echo  '* modules         - Build all modules'
1295         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1296         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1297         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1298         @echo  '  dir/            - Build all files in dir and below'
1299         @echo  '  dir/file.[ois]  - Build specified target only'
1300         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1301         @echo  '                    (requires a recent binutils and recent build (System.map))'
1302         @echo  '  dir/file.ko     - Build module including final link'
1303         @echo  '  modules_prepare - Set up for building external modules'
1304         @echo  '  tags/TAGS       - Generate tags file for editors'
1305         @echo  '  cscope          - Generate cscope index'
1306         @echo  '  gtags           - Generate GNU GLOBAL index'
1307         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1308         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1309         @echo  '  image_name      - Output the image name (use with make -s)'
1310         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1311          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1312          echo  ''
1313         @echo  'Static analysers'
1314         @echo  '  checkstack      - Generate a list of stack hogs'
1315         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1316         @echo  '  versioncheck    - Sanity check on version.h usage'
1317         @echo  '  includecheck    - Check for duplicate included header files'
1318         @echo  '  export_report   - List the usages of all exported symbols'
1319         @echo  '  headers_check   - Sanity check on exported headers'
1320         @echo  '  headerdep       - Detect inclusion cycles in headers'
1321         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1322         @echo  ''
1323         @echo  'Kernel selftest'
1324         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1325         @echo  '                    Build, install, and boot kernel before'
1326         @echo  '                    running kselftest on it'
1327         @echo  '  kselftest-clean - Remove all generated kselftest files'
1328         @echo  ''
1329         @echo  'Kernel packaging:'
1330         @$(MAKE) $(build)=$(package-dir) help
1331         @echo  ''
1332         @echo  'Documentation targets:'
1333         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1334         @echo  ''
1335         @echo  'Architecture specific targets ($(SRCARCH)):'
1336         @$(if $(archhelp),$(archhelp),\
1337                 echo '  No architecture specific help defined for $(SRCARCH)')
1338         @echo  ''
1339         @$(if $(boards), \
1340                 $(foreach b, $(boards), \
1341                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1342                 echo '')
1343         @$(if $(board-dirs), \
1344                 $(foreach b, $(board-dirs), \
1345                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1346                 printf "  %-16s - Show all of the above\\n" help-boards; \
1347                 echo '')
1348
1349         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1350         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1351         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1352         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1353         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1354         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1355         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1356         @echo  '                1: warnings which may be relevant and do not occur too often'
1357         @echo  '                2: warnings which occur quite often but may still be relevant'
1358         @echo  '                3: more obscure warnings, can most likely be ignored'
1359         @echo  '                Multiple levels can be combined with W=12 or W=123'
1360         @echo  ''
1361         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1362         @echo  'For further info see the ./README file'
1363
1364
1365 help-board-dirs := $(addprefix help-,$(board-dirs))
1366
1367 help-boards: $(help-board-dirs)
1368
1369 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1370
1371 $(help-board-dirs): help-%:
1372         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1373         @$(if $(boards-per-dir), \
1374                 $(foreach b, $(boards-per-dir), \
1375                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1376                 echo '')
1377
1378
1379 # Documentation targets
1380 # ---------------------------------------------------------------------------
1381 %docs: scripts_basic FORCE
1382         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1383         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1384
1385 else # KBUILD_EXTMOD
1386
1387 ###
1388 # External module support.
1389 # When building external modules the kernel used as basis is considered
1390 # read-only, and no consistency checks are made and the make
1391 # system is not used on the basis kernel. If updates are required
1392 # in the basis kernel ordinary make commands (without M=...) must
1393 # be used.
1394 #
1395 # The following are the only valid targets when building external
1396 # modules.
1397 # make M=dir clean     Delete all automatically generated files
1398 # make M=dir modules   Make all modules in specified dir
1399 # make M=dir           Same as 'make M=dir modules'
1400 # make M=dir modules_install
1401 #                      Install the modules built in the module directory
1402 #                      Assumes install directory is already created
1403
1404 # We are always building modules
1405 KBUILD_MODULES := 1
1406 PHONY += crmodverdir
1407 crmodverdir:
1408         $(cmd_crmodverdir)
1409
1410 PHONY += $(objtree)/Module.symvers
1411 $(objtree)/Module.symvers:
1412         @test -e $(objtree)/Module.symvers || ( \
1413         echo; \
1414         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1415         echo "           is missing; modules will have no dependencies and modversions."; \
1416         echo )
1417
1418 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1419 PHONY += $(module-dirs) modules
1420 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1421         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1422
1423 modules: $(module-dirs)
1424         @$(kecho) '  Building modules, stage 2.';
1425         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1426
1427 PHONY += modules_install
1428 modules_install: _emodinst_ _emodinst_post
1429
1430 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1431 PHONY += _emodinst_
1432 _emodinst_:
1433         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1434         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1435
1436 PHONY += _emodinst_post
1437 _emodinst_post: _emodinst_
1438         $(call cmd,depmod)
1439
1440 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1441
1442 PHONY += $(clean-dirs) clean
1443 $(clean-dirs):
1444         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1445
1446 clean:  rm-dirs := $(MODVERDIR)
1447 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1448
1449 help:
1450         @echo  '  Building external modules.'
1451         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1452         @echo  ''
1453         @echo  '  modules         - default target, build the module(s)'
1454         @echo  '  modules_install - install the module'
1455         @echo  '  clean           - remove generated files in module directory only'
1456         @echo  ''
1457
1458 # Dummies...
1459 PHONY += prepare scripts
1460 prepare: ;
1461 scripts: ;
1462 endif # KBUILD_EXTMOD
1463
1464 clean: $(clean-dirs)
1465         $(call cmd,rmdirs)
1466         $(call cmd,rmfiles)
1467         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1468                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1469                 -o -name '*.ko.*' \
1470                 -o -name '*.dwo'  \
1471                 -o -name '*.su'  \
1472                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1473                 -o -name '*.symtypes' -o -name 'modules.order' \
1474                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1475                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1476
1477 # Generate tags for editors
1478 # ---------------------------------------------------------------------------
1479 quiet_cmd_tags = GEN     $@
1480       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1481
1482 tags TAGS cscope gtags: FORCE
1483         $(call cmd,tags)
1484
1485 # Scripts to check various things for consistency
1486 # ---------------------------------------------------------------------------
1487
1488 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1489
1490 includecheck:
1491         find $(srctree)/* $(RCS_FIND_IGNORE) \
1492                 -name '*.[hcS]' -type f -print | sort \
1493                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1494
1495 versioncheck:
1496         find $(srctree)/* $(RCS_FIND_IGNORE) \
1497                 -name '*.[hcS]' -type f -print | sort \
1498                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1499
1500 coccicheck:
1501         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1502
1503 namespacecheck:
1504         $(PERL) $(srctree)/scripts/namespace.pl
1505
1506 export_report:
1507         $(PERL) $(srctree)/scripts/export_report.pl
1508
1509 endif #ifeq ($(config-targets),1)
1510 endif #ifeq ($(mixed-targets),1)
1511
1512 PHONY += checkstack kernelrelease kernelversion image_name
1513
1514 # UML needs a little special treatment here.  It wants to use the host
1515 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1516 # else wants $(ARCH), including people doing cross-builds, which means
1517 # that $(SUBARCH) doesn't work here.
1518 ifeq ($(ARCH), um)
1519 CHECKSTACK_ARCH := $(SUBARCH)
1520 else
1521 CHECKSTACK_ARCH := $(ARCH)
1522 endif
1523 checkstack:
1524         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1525         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1526
1527 kernelrelease:
1528         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1529
1530 kernelversion:
1531         @echo $(KERNELVERSION)
1532
1533 image_name:
1534         @echo $(KBUILD_IMAGE)
1535
1536 # Clear a bunch of variables before executing the submake
1537 tools/: FORCE
1538         $(Q)mkdir -p $(objtree)/tools
1539         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1540
1541 tools/%: FORCE
1542         $(Q)mkdir -p $(objtree)/tools
1543         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1544
1545 # Single targets
1546 # ---------------------------------------------------------------------------
1547 # Single targets are compatible with:
1548 # - build with mixed source and output
1549 # - build with separate output dir 'make O=...'
1550 # - external modules
1551 #
1552 #  target-dir => where to store outputfile
1553 #  build-dir  => directory in kernel source tree to use
1554
1555 ifeq ($(KBUILD_EXTMOD),)
1556         build-dir  = $(patsubst %/,%,$(dir $@))
1557         target-dir = $(dir $@)
1558 else
1559         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1560         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1561         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1562 endif
1563
1564 %.s: %.c prepare scripts FORCE
1565         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1566 %.i: %.c prepare scripts FORCE
1567         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1568 %.o: %.c prepare scripts FORCE
1569         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1570 %.lst: %.c prepare scripts FORCE
1571         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1572 %.s: %.S prepare scripts FORCE
1573         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1574 %.o: %.S prepare scripts FORCE
1575         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1576 %.symtypes: %.c prepare scripts FORCE
1577         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1578
1579 # Modules
1580 /: prepare scripts FORCE
1581         $(cmd_crmodverdir)
1582         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1583         $(build)=$(build-dir)
1584 # Make sure the latest headers are built for Documentation
1585 Documentation/: headers_install
1586 %/: prepare scripts FORCE
1587         $(cmd_crmodverdir)
1588         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1589         $(build)=$(build-dir)
1590 %.ko: prepare scripts FORCE
1591         $(cmd_crmodverdir)
1592         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1593         $(build)=$(build-dir) $(@:.ko=.o)
1594         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1595
1596 # FIXME Should go into a make.lib or something
1597 # ===========================================================================
1598
1599 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1600       cmd_rmdirs = rm -rf $(rm-dirs)
1601
1602 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1603       cmd_rmfiles = rm -f $(rm-files)
1604
1605 # Run depmod only if we have System.map and depmod is executable
1606 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1607       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1608                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1609
1610 # Create temporary dir for module support files
1611 # clean it up only when building all modules
1612 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1613                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1614
1615 # read all saved command lines
1616
1617 targets := $(wildcard $(sort $(targets)))
1618 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1619
1620 ifneq ($(cmd_files),)
1621   $(cmd_files): ;       # Do not try to update included dependency files
1622   include $(cmd_files)
1623 endif
1624
1625 endif   # skip-makefile
1626
1627 PHONY += FORCE
1628 FORCE:
1629
1630 # Declare the contents of the .PHONY variable as phony.  We keep that
1631 # information in a variable so we can use it in if_changed and friends.
1632 .PHONY: $(PHONY)