Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 8
   3 SUBLEVEL = 0
   4 EXTRAVERSION = -rc6
   5 NAME = Psychotic Stoned Sheep
   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:
 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 NOSTDINC_FLAGS  =
 367 CFLAGS_MODULE   =
 368 AFLAGS_MODULE   =
 369 LDFLAGS_MODULE  =
 370 CFLAGS_KERNEL   =
 371 AFLAGS_KERNEL   =
 372 LDFLAGS_vmlinux =
 373 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
 374 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 375
 376
 377 # Use USERINCLUDE when you must reference the UAPI directories only.
 378 USERINCLUDE    := \
 379                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 380                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 381                 -I$(srctree)/include/uapi \
 382                 -I$(objtree)/include/generated/uapi \
 383                 -include $(srctree)/include/linux/kconfig.h
 384
 385 # Use LINUXINCLUDE when you must reference the include/ directory.
 386 # Needed to be compatible with the O= option
 387 LINUXINCLUDE    := \
 388                 -I$(srctree)/arch/$(hdr-arch)/include \
 389                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 390                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 391                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 392                 -I$(objtree)/include
 393
 394 LINUXINCLUDE    += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
 395
 396 KBUILD_CPPFLAGS := -D__KERNEL__
 397
 398 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 399                    -fno-strict-aliasing -fno-common \
 400                    -Werror-implicit-function-declaration \
 401                    -Wno-format-security \
 402                    -std=gnu89
 403
 404 KBUILD_AFLAGS_KERNEL :=
 405 KBUILD_CFLAGS_KERNEL :=
 406 KBUILD_AFLAGS   := -D__ASSEMBLY__
 407 KBUILD_AFLAGS_MODULE  := -DMODULE
 408 KBUILD_CFLAGS_MODULE  := -DMODULE
 409 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 410
 411 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 412 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 413 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 414
 415 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 416 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 417 export CPP AR NM STRIP OBJCOPY OBJDUMP
 418 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 419 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 420
 421 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 422 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
 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 gcc-plugins
 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
 625 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 626 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 627 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 628 endif
 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 include scripts/Makefile.gcc-plugins
 644
 645 ifdef CONFIG_READABLE_ASM
 646 # Disable optimizations that make assembler listings hard to read.
 647 # reorder blocks reorders the control in the function
 648 # ipa clone creates specialized cloned functions
 649 # partial inlining inlines only parts of functions
 650 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 651                  $(call cc-option,-fno-ipa-cp-clone,) \
 652                  $(call cc-option,-fno-partial-inlining)
 653 endif
 654
 655 ifneq ($(CONFIG_FRAME_WARN),0)
 656 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 657 endif
 658
 659 # This selects the stack protector compiler flag. Testing it is delayed
 660 # until after .config has been reprocessed, in the prepare-compiler-check
 661 # target.
 662 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 663   stackp-flag := -fstack-protector
 664   stackp-name := REGULAR
 665 else
 666 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 667   stackp-flag := -fstack-protector-strong
 668   stackp-name := STRONG
 669 else
 670   # Force off for distro compilers that enable stack protector by default.
 671   stackp-flag := $(call cc-option, -fno-stack-protector)
 672 endif
 673 endif
 674 # Find arch-specific stack protector compiler sanity-checking script.
 675 ifdef CONFIG_CC_STACKPROTECTOR
 676   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 677   stackp-check := $(wildcard $(stackp-path))
 678 endif
 679 KBUILD_CFLAGS += $(stackp-flag)
 680
 681 ifeq ($(cc-name),clang)
 682 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 683 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 684 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 685 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 686 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 687 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 688 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 689 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 690 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 691 # See modpost pattern 2
 692 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 693 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 694 else
 695
 696 # These warnings generated too much noise in a regular build.
 697 # Use make W=1 to enable them (see scripts/Makefile.build)
 698 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 699 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 700 endif
 701
 702 ifdef CONFIG_FRAME_POINTER
 703 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 704 else
 705 # Some targets (ARM with Thumb2, for example), can't be built with frame
 706 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 707 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 708 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 709 # -fomit-frame-pointer with FUNCTION_TRACER.
 710 ifndef CONFIG_FUNCTION_TRACER
 711 KBUILD_CFLAGS   += -fomit-frame-pointer
 712 endif
 713 endif
 714
 715 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 716
 717 ifdef CONFIG_DEBUG_INFO
 718 ifdef CONFIG_DEBUG_INFO_SPLIT
 719 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 720 else
 721 KBUILD_CFLAGS   += -g
 722 endif
 723 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 724 endif
 725 ifdef CONFIG_DEBUG_INFO_DWARF4
 726 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 727 endif
 728
 729 ifdef CONFIG_DEBUG_INFO_REDUCED
 730 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 731                    $(call cc-option,-fno-var-tracking)
 732 endif
 733
 734 ifdef CONFIG_FUNCTION_TRACER
 735 ifndef CC_FLAGS_FTRACE
 736 CC_FLAGS_FTRACE := -pg
 737 endif
 738 export CC_FLAGS_FTRACE
 739 ifdef CONFIG_HAVE_FENTRY
 740 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 741 endif
 742 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 743 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 744 ifdef CONFIG_DYNAMIC_FTRACE
 745         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 746                 BUILD_C_RECORDMCOUNT := y
 747                 export BUILD_C_RECORDMCOUNT
 748         endif
 749 endif
 750 endif
 751
 752 # We trigger additional mismatches with less inlining
 753 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 754 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 755 endif
 756
 757 # arch Makefile may override CC so keep this after arch Makefile is included
 758 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 759 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 760
 761 # warn about C99 declaration after statement
 762 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 763
 764 # disable pointer signed / unsigned warnings in gcc 4.0
 765 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 766
 767 # disable invalid "can't wrap" optimizations for signed / pointers
 768 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 769
 770 # conserve stack if available
 771 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 772
 773 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 774 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 775
 776 # require functions to have arguments in prototypes, not empty 'int foo()'
 777 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 778
 779 # Prohibit date/time macros, which would make the build non-deterministic
 780 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 781
 782 # enforce correct pointer usage
 783 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 784
 785 # use the deterministic mode of AR if available
 786 KBUILD_ARFLAGS := $(call ar-option,D)
 787
 788 # check for 'asm goto'
 789 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 790         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 791         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 792 endif
 793
 794 include scripts/Makefile.kasan
 795 include scripts/Makefile.extrawarn
 796 include scripts/Makefile.ubsan
 797
 798 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 799 # last assignments
 800 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 801 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 802 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 803
 804 # Use --build-id when available.
 805 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 806                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 807 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 808 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 809
 810 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 811 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 812 endif
 813
 814 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 815 LDFLAGS_vmlinux += $(call ld-option, -X,)
 816 endif
 817
 818 # Default kernel image to build when no specific target is given.
 819 # KBUILD_IMAGE may be overruled on the command line or
 820 # set in the environment
 821 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 822 # this default value
 823 export KBUILD_IMAGE ?= vmlinux
 824
 825 #
 826 # INSTALL_PATH specifies where to place the updated kernel and system map
 827 # images. Default is /boot, but you can set it to other values
 828 export  INSTALL_PATH ?= /boot
 829
 830 #
 831 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 832 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 833 # an argument if needed. Otherwise it defaults to the kernel install path
 834 #
 835 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 836
 837 #
 838 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 839 # relocations required by build roots.  This is not defined in the
 840 # makefile but the argument can be passed to make if needed.
 841 #
 842
 843 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 844 export MODLIB
 845
 846 #
 847 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 848 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 849 # the default option --strip-debug will be used.  Otherwise,
 850 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 851
 852 ifdef INSTALL_MOD_STRIP
 853 ifeq ($(INSTALL_MOD_STRIP),1)
 854 mod_strip_cmd = $(STRIP) --strip-debug
 855 else
 856 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 857 endif # INSTALL_MOD_STRIP=1
 858 else
 859 mod_strip_cmd = true
 860 endif # INSTALL_MOD_STRIP
 861 export mod_strip_cmd
 862
 863 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 864 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 865 # or CONFIG_MODULE_COMPRESS_XZ.
 866
 867 mod_compress_cmd = true
 868 ifdef CONFIG_MODULE_COMPRESS
 869   ifdef CONFIG_MODULE_COMPRESS_GZIP
 870     mod_compress_cmd = gzip -n -f
 871   endif # CONFIG_MODULE_COMPRESS_GZIP
 872   ifdef CONFIG_MODULE_COMPRESS_XZ
 873     mod_compress_cmd = xz -f
 874   endif # CONFIG_MODULE_COMPRESS_XZ
 875 endif # CONFIG_MODULE_COMPRESS
 876 export mod_compress_cmd
 877
 878 # Select initial ramdisk compression format, default is gzip(1).
 879 # This shall be used by the dracut(8) tool while creating an initramfs image.
 880 #
 881 INITRD_COMPRESS-y                  := gzip
 882 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 883 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 884 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 885 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 886 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 887 # do not export INITRD_COMPRESS, since we didn't actually
 888 # choose a sane default compression above.
 889 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 890
 891 ifdef CONFIG_MODULE_SIG_ALL
 892 $(eval $(call config_filename,MODULE_SIG_KEY))
 893
 894 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 895 else
 896 mod_sign_cmd = true
 897 endif
 898 export mod_sign_cmd
 899
 900
 901 ifeq ($(KBUILD_EXTMOD),)
 902 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 903
 904 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 905                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 906                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 907
 908 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 909                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 910
 911 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 912 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 913 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 914 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 915 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 916 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 917 libs-y          := $(libs-y1) $(libs-y2)
 918 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 919
 920 # Externally visible symbols (used by link-vmlinux.sh)
 921 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 922 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 923 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 924 export LDFLAGS_vmlinux
 925 # used by scripts/pacmage/Makefile
 926 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 927
 928 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 929
 930 # Include targets which we want to execute sequentially if the rest of the
 931 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 932 # evaluated more than once.
 933 PHONY += vmlinux_prereq
 934 vmlinux_prereq: $(vmlinux-deps) FORCE
 935 ifdef CONFIG_HEADERS_CHECK
 936         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 937 endif
 938 ifdef CONFIG_BUILD_DOCSRC
 939         $(Q)$(MAKE) $(build)=Documentation
 940 endif
 941 ifdef CONFIG_GDB_SCRIPTS
 942         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 943 endif
 944 ifdef CONFIG_TRIM_UNUSED_KSYMS
 945         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 946           "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq"
 947 endif
 948
 949 # standalone target for easier testing
 950 include/generated/autoksyms.h: FORCE
 951         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 952
 953 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 954
 955 # Final link of vmlinux with optional arch pass after final link
 956     cmd_link-vmlinux =                                                 \
 957         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
 958         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 959
 960 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
 961         +$(call if_changed,link-vmlinux)
 962
 963 # Build samples along the rest of the kernel
 964 ifdef CONFIG_SAMPLES
 965 vmlinux-dirs += samples
 966 endif
 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 # From this point forward, .config has been reprocessed, so any rules
1015 # that need to depend on updated CONFIG_* values can be checked here.
1016 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1017
1018 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1019                    include/config/auto.conf
1020         $(cmd_crmodverdir)
1021         $(Q)test -e include/generated/autoksyms.h || \
1022             touch   include/generated/autoksyms.h
1023
1024 archprepare: archheaders archscripts prepare1 scripts_basic
1025
1026 prepare0: archprepare gcc-plugins
1027         $(Q)$(MAKE) $(build)=.
1028
1029 # All the preparing..
1030 prepare: prepare0 prepare-objtool
1031
1032 ifdef CONFIG_STACK_VALIDATION
1033   has_libelf := $(call try-run,\
1034                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1035   ifeq ($(has_libelf),1)
1036     objtool_target := tools/objtool FORCE
1037   else
1038     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1039     SKIP_STACK_VALIDATION := 1
1040     export SKIP_STACK_VALIDATION
1041   endif
1042 endif
1043
1044 PHONY += prepare-objtool
1045 prepare-objtool: $(objtool_target)
1046
1047 # Check for CONFIG flags that require compiler support. Abort the build
1048 # after .config has been processed, but before the kernel build starts.
1049 #
1050 # For security-sensitive CONFIG options, we don't want to fallback and/or
1051 # silently change which compiler flags will be used, since that leads to
1052 # producing kernels with different security feature characteristics
1053 # depending on the compiler used. (For example, "But I selected
1054 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1055 PHONY += prepare-compiler-check
1056 prepare-compiler-check: FORCE
1057 # Make sure compiler supports requested stack protector flag.
1058 ifdef stackp-name
1059   ifeq ($(call cc-option, $(stackp-flag)),)
1060         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1061                   $(stackp-flag) not supported by compiler >&2 && exit 1
1062   endif
1063 endif
1064 # Make sure compiler does not have buggy stack-protector support.
1065 ifdef stackp-check
1066   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1067         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1068                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1069   endif
1070 endif
1071         @:
1072
1073 # Generate some files
1074 # ---------------------------------------------------------------------------
1075
1076 # KERNELRELEASE can change from a few different places, meaning version.h
1077 # needs to be updated, so this check is forced on all builds
1078
1079 uts_len := 64
1080 define filechk_utsrelease.h
1081         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1082           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1083           exit 1;                                                         \
1084         fi;                                                               \
1085         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1086 endef
1087
1088 define filechk_version.h
1089         (echo \#define LINUX_VERSION_CODE $(shell                         \
1090         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1091         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1092 endef
1093
1094 $(version_h): $(srctree)/Makefile FORCE
1095         $(call filechk,version.h)
1096         $(Q)rm -f $(old_version_h)
1097
1098 include/generated/utsrelease.h: include/config/kernel.release FORCE
1099         $(call filechk,utsrelease.h)
1100
1101 PHONY += headerdep
1102 headerdep:
1103         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1104         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1105
1106 # ---------------------------------------------------------------------------
1107 # Firmware install
1108 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1109 export INSTALL_FW_PATH
1110
1111 PHONY += firmware_install
1112 firmware_install:
1113         @mkdir -p $(objtree)/firmware
1114         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1115
1116 # ---------------------------------------------------------------------------
1117 # Kernel headers
1118
1119 #Default location for installed headers
1120 export INSTALL_HDR_PATH = $(objtree)/usr
1121
1122 # If we do an all arch process set dst to asm-$(hdr-arch)
1123 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1124
1125 PHONY += archheaders
1126 archheaders:
1127
1128 PHONY += archscripts
1129 archscripts:
1130
1131 PHONY += __headers
1132 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1133         $(Q)$(MAKE) $(build)=scripts build_unifdef
1134
1135 PHONY += headers_install_all
1136 headers_install_all:
1137         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1138
1139 PHONY += headers_install
1140 headers_install: __headers
1141         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1142           $(error Headers not exportable for the $(SRCARCH) architecture))
1143         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1144         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1145
1146 PHONY += headers_check_all
1147 headers_check_all: headers_install_all
1148         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1149
1150 PHONY += headers_check
1151 headers_check: headers_install
1152         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1153         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1154
1155 # ---------------------------------------------------------------------------
1156 # Kernel selftest
1157
1158 PHONY += kselftest
1159 kselftest:
1160         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1161
1162 kselftest-clean:
1163         $(Q)$(MAKE) -C tools/testing/selftests clean
1164
1165 PHONY += kselftest-merge
1166 kselftest-merge:
1167         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1168         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1169                 -m $(objtree)/.config \
1170                 $(srctree)/tools/testing/selftests/*/config
1171         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1172
1173 # ---------------------------------------------------------------------------
1174 # Modules
1175
1176 ifdef CONFIG_MODULES
1177
1178 # By default, build modules as well
1179
1180 all: modules
1181
1182 # Build modules
1183 #
1184 # A module can be listed more than once in obj-m resulting in
1185 # duplicate lines in modules.order files.  Those are removed
1186 # using awk while concatenating to the final file.
1187
1188 PHONY += modules
1189 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1190         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1191         @$(kecho) '  Building modules, stage 2.';
1192         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1193         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1194
1195 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1196         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1197
1198 %/modules.builtin: include/config/auto.conf
1199         $(Q)$(MAKE) $(modbuiltin)=$*
1200
1201
1202 # Target to prepare building external modules
1203 PHONY += modules_prepare
1204 modules_prepare: prepare scripts
1205
1206 # Target to install modules
1207 PHONY += modules_install
1208 modules_install: _modinst_ _modinst_post
1209
1210 PHONY += _modinst_
1211 _modinst_:
1212         @rm -rf $(MODLIB)/kernel
1213         @rm -f $(MODLIB)/source
1214         @mkdir -p $(MODLIB)/kernel
1215         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1216         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1217                 rm -f $(MODLIB)/build ; \
1218                 ln -s $(CURDIR) $(MODLIB)/build ; \
1219         fi
1220         @cp -f $(objtree)/modules.order $(MODLIB)/
1221         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1222         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1223
1224 # This depmod is only for convenience to give the initial
1225 # boot a modules.dep even before / is mounted read-write.  However the
1226 # boot script depmod is the master version.
1227 PHONY += _modinst_post
1228 _modinst_post: _modinst_
1229         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1230         $(call cmd,depmod)
1231
1232 ifeq ($(CONFIG_MODULE_SIG), y)
1233 PHONY += modules_sign
1234 modules_sign:
1235         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1236 endif
1237
1238 else # CONFIG_MODULES
1239
1240 # Modules not configured
1241 # ---------------------------------------------------------------------------
1242
1243 PHONY += modules modules_install
1244 modules modules_install:
1245         @echo >&2
1246         @echo >&2 "The present kernel configuration has modules disabled."
1247         @echo >&2 "Type 'make config' and enable loadable module support."
1248         @echo >&2 "Then build a kernel with module support enabled."
1249         @echo >&2
1250         @exit 1
1251
1252 endif # CONFIG_MODULES
1253
1254 ###
1255 # Cleaning is done on three levels.
1256 # make clean     Delete most generated files
1257 #                Leave enough to build external modules
1258 # make mrproper  Delete the current configuration, and all generated files
1259 # make distclean Remove editor backup files, patch leftover files and the like
1260
1261 # Directories & files removed with 'make clean'
1262 CLEAN_DIRS  += $(MODVERDIR)
1263
1264 # Directories & files removed with 'make mrproper'
1265 MRPROPER_DIRS  += include/config usr/include include/generated          \
1266                   arch/*/include/generated .tmp_objdiff
1267 MRPROPER_FILES += .config .config.old .version .old_version \
1268                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1269                   signing_key.pem signing_key.priv signing_key.x509     \
1270                   x509.genkey extra_certificates signing_key.x509.keyid \
1271                   signing_key.x509.signer vmlinux-gdb.py
1272
1273 # clean - Delete most, but leave enough to build external modules
1274 #
1275 clean: rm-dirs  := $(CLEAN_DIRS)
1276 clean: rm-files := $(CLEAN_FILES)
1277 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1278
1279 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1280 $(clean-dirs):
1281         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1282
1283 vmlinuxclean:
1284         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1285         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1286
1287 clean: archclean vmlinuxclean
1288
1289 # mrproper - Delete all generated files, including .config
1290 #
1291 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1292 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1293 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1294
1295 PHONY += $(mrproper-dirs) mrproper archmrproper
1296 $(mrproper-dirs):
1297         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1298
1299 mrproper: clean archmrproper $(mrproper-dirs)
1300         $(call cmd,rmdirs)
1301         $(call cmd,rmfiles)
1302
1303 # distclean
1304 #
1305 PHONY += distclean
1306
1307 distclean: mrproper
1308         @find $(srctree) $(RCS_FIND_IGNORE) \
1309                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1310                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1311                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1312                 -type f -print | xargs rm -f
1313
1314
1315 # Packaging of the kernel to various formats
1316 # ---------------------------------------------------------------------------
1317 # rpm target kept for backward compatibility
1318 package-dir     := scripts/package
1319
1320 %src-pkg: FORCE
1321         $(Q)$(MAKE) $(build)=$(package-dir) $@
1322 %pkg: include/config/kernel.release FORCE
1323         $(Q)$(MAKE) $(build)=$(package-dir) $@
1324 rpm: include/config/kernel.release FORCE
1325         $(Q)$(MAKE) $(build)=$(package-dir) $@
1326
1327
1328 # Brief documentation of the typical targets used
1329 # ---------------------------------------------------------------------------
1330
1331 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1332 boards := $(sort $(notdir $(boards)))
1333 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1334 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1335
1336 PHONY += help
1337 help:
1338         @echo  'Cleaning targets:'
1339         @echo  '  clean           - Remove most generated files but keep the config and'
1340         @echo  '                    enough build support to build external modules'
1341         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1342         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1343         @echo  ''
1344         @echo  'Configuration targets:'
1345         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1346         @echo  ''
1347         @echo  'Other generic targets:'
1348         @echo  '  all             - Build all targets marked with [*]'
1349         @echo  '* vmlinux         - Build the bare kernel'
1350         @echo  '* modules         - Build all modules'
1351         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1352         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1353         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1354         @echo  '  dir/            - Build all files in dir and below'
1355         @echo  '  dir/file.[ois]  - Build specified target only'
1356         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1357         @echo  '                    (requires a recent binutils and recent build (System.map))'
1358         @echo  '  dir/file.ko     - Build module including final link'
1359         @echo  '  modules_prepare - Set up for building external modules'
1360         @echo  '  tags/TAGS       - Generate tags file for editors'
1361         @echo  '  cscope          - Generate cscope index'
1362         @echo  '  gtags           - Generate GNU GLOBAL index'
1363         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1364         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1365         @echo  '  image_name      - Output the image name (use with make -s)'
1366         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1367          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1368          echo  ''
1369         @echo  'Static analysers'
1370         @echo  '  checkstack      - Generate a list of stack hogs'
1371         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1372         @echo  '  versioncheck    - Sanity check on version.h usage'
1373         @echo  '  includecheck    - Check for duplicate included header files'
1374         @echo  '  export_report   - List the usages of all exported symbols'
1375         @echo  '  headers_check   - Sanity check on exported headers'
1376         @echo  '  headerdep       - Detect inclusion cycles in headers'
1377         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1378         @echo  ''
1379         @echo  'Kernel selftest'
1380         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1381         @echo  '                    Build, install, and boot kernel before'
1382         @echo  '                    running kselftest on it'
1383         @echo  '  kselftest-clean - Remove all generated kselftest files'
1384         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1385         @echo  '                    .config.'
1386         @echo  ''
1387         @echo  'Kernel packaging:'
1388         @$(MAKE) $(build)=$(package-dir) help
1389         @echo  ''
1390         @echo  'Documentation targets:'
1391         @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1392         @echo  ''
1393         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1394         @echo  ''
1395         @echo  'Architecture specific targets ($(SRCARCH)):'
1396         @$(if $(archhelp),$(archhelp),\
1397                 echo '  No architecture specific help defined for $(SRCARCH)')
1398         @echo  ''
1399         @$(if $(boards), \
1400                 $(foreach b, $(boards), \
1401                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1402                 echo '')
1403         @$(if $(board-dirs), \
1404                 $(foreach b, $(board-dirs), \
1405                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1406                 printf "  %-16s - Show all of the above\\n" help-boards; \
1407                 echo '')
1408
1409         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1410         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1411         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1412         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1413         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1414         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1415         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1416         @echo  '                1: warnings which may be relevant and do not occur too often'
1417         @echo  '                2: warnings which occur quite often but may still be relevant'
1418         @echo  '                3: more obscure warnings, can most likely be ignored'
1419         @echo  '                Multiple levels can be combined with W=12 or W=123'
1420         @echo  ''
1421         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1422         @echo  'For further info see the ./README file'
1423
1424
1425 help-board-dirs := $(addprefix help-,$(board-dirs))
1426
1427 help-boards: $(help-board-dirs)
1428
1429 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1430
1431 $(help-board-dirs): help-%:
1432         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1433         @$(if $(boards-per-dir), \
1434                 $(foreach b, $(boards-per-dir), \
1435                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1436                 echo '')
1437
1438
1439 # Documentation targets
1440 # ---------------------------------------------------------------------------
1441 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1442 PHONY += $(DOC_TARGETS)
1443 $(DOC_TARGETS): scripts_basic FORCE
1444         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1445         $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1446         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1447
1448 else # KBUILD_EXTMOD
1449
1450 ###
1451 # External module support.
1452 # When building external modules the kernel used as basis is considered
1453 # read-only, and no consistency checks are made and the make
1454 # system is not used on the basis kernel. If updates are required
1455 # in the basis kernel ordinary make commands (without M=...) must
1456 # be used.
1457 #
1458 # The following are the only valid targets when building external
1459 # modules.
1460 # make M=dir clean     Delete all automatically generated files
1461 # make M=dir modules   Make all modules in specified dir
1462 # make M=dir           Same as 'make M=dir modules'
1463 # make M=dir modules_install
1464 #                      Install the modules built in the module directory
1465 #                      Assumes install directory is already created
1466
1467 # We are always building modules
1468 KBUILD_MODULES := 1
1469 PHONY += crmodverdir
1470 crmodverdir:
1471         $(cmd_crmodverdir)
1472
1473 PHONY += $(objtree)/Module.symvers
1474 $(objtree)/Module.symvers:
1475         @test -e $(objtree)/Module.symvers || ( \
1476         echo; \
1477         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1478         echo "           is missing; modules will have no dependencies and modversions."; \
1479         echo )
1480
1481 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1482 PHONY += $(module-dirs) modules
1483 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1484         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1485
1486 modules: $(module-dirs)
1487         @$(kecho) '  Building modules, stage 2.';
1488         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1489
1490 PHONY += modules_install
1491 modules_install: _emodinst_ _emodinst_post
1492
1493 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1494 PHONY += _emodinst_
1495 _emodinst_:
1496         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1497         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1498
1499 PHONY += _emodinst_post
1500 _emodinst_post: _emodinst_
1501         $(call cmd,depmod)
1502
1503 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1504
1505 PHONY += $(clean-dirs) clean
1506 $(clean-dirs):
1507         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1508
1509 clean:  rm-dirs := $(MODVERDIR)
1510 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1511
1512 PHONY += help
1513 help:
1514         @echo  '  Building external modules.'
1515         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1516         @echo  ''
1517         @echo  '  modules         - default target, build the module(s)'
1518         @echo  '  modules_install - install the module'
1519         @echo  '  clean           - remove generated files in module directory only'
1520         @echo  ''
1521
1522 # Dummies...
1523 PHONY += prepare scripts
1524 prepare: ;
1525 scripts: ;
1526 endif # KBUILD_EXTMOD
1527
1528 clean: $(clean-dirs)
1529         $(call cmd,rmdirs)
1530         $(call cmd,rmfiles)
1531         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1532                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1533                 -o -name '*.ko.*' \
1534                 -o -name '*.dwo'  \
1535                 -o -name '*.su'  \
1536                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1537                 -o -name '*.symtypes' -o -name 'modules.order' \
1538                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1539                 -o -name '*.c.[012]*.*' \
1540                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1541
1542 # Generate tags for editors
1543 # ---------------------------------------------------------------------------
1544 quiet_cmd_tags = GEN     $@
1545       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1546
1547 tags TAGS cscope gtags: FORCE
1548         $(call cmd,tags)
1549
1550 # Scripts to check various things for consistency
1551 # ---------------------------------------------------------------------------
1552
1553 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1554
1555 includecheck:
1556         find $(srctree)/* $(RCS_FIND_IGNORE) \
1557                 -name '*.[hcS]' -type f -print | sort \
1558                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1559
1560 versioncheck:
1561         find $(srctree)/* $(RCS_FIND_IGNORE) \
1562                 -name '*.[hcS]' -type f -print | sort \
1563                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1564
1565 coccicheck:
1566         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1567
1568 namespacecheck:
1569         $(PERL) $(srctree)/scripts/namespace.pl
1570
1571 export_report:
1572         $(PERL) $(srctree)/scripts/export_report.pl
1573
1574 endif #ifeq ($(config-targets),1)
1575 endif #ifeq ($(mixed-targets),1)
1576
1577 PHONY += checkstack kernelrelease kernelversion image_name
1578
1579 # UML needs a little special treatment here.  It wants to use the host
1580 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1581 # else wants $(ARCH), including people doing cross-builds, which means
1582 # that $(SUBARCH) doesn't work here.
1583 ifeq ($(ARCH), um)
1584 CHECKSTACK_ARCH := $(SUBARCH)
1585 else
1586 CHECKSTACK_ARCH := $(ARCH)
1587 endif
1588 checkstack:
1589         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1590         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1591
1592 kernelrelease:
1593         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1594
1595 kernelversion:
1596         @echo $(KERNELVERSION)
1597
1598 image_name:
1599         @echo $(KBUILD_IMAGE)
1600
1601 # Clear a bunch of variables before executing the submake
1602 tools/: FORCE
1603         $(Q)mkdir -p $(objtree)/tools
1604         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1605
1606 tools/%: FORCE
1607         $(Q)mkdir -p $(objtree)/tools
1608         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1609
1610 # Single targets
1611 # ---------------------------------------------------------------------------
1612 # Single targets are compatible with:
1613 # - build with mixed source and output
1614 # - build with separate output dir 'make O=...'
1615 # - external modules
1616 #
1617 #  target-dir => where to store outputfile
1618 #  build-dir  => directory in kernel source tree to use
1619
1620 ifeq ($(KBUILD_EXTMOD),)
1621         build-dir  = $(patsubst %/,%,$(dir $@))
1622         target-dir = $(dir $@)
1623 else
1624         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1625         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1626         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1627 endif
1628
1629 %.s: %.c prepare scripts FORCE
1630         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1631 %.i: %.c prepare scripts FORCE
1632         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1633 %.o: %.c prepare scripts FORCE
1634         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1635 %.lst: %.c prepare scripts FORCE
1636         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1637 %.s: %.S prepare scripts FORCE
1638         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1639 %.o: %.S prepare scripts FORCE
1640         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1641 %.symtypes: %.c prepare scripts FORCE
1642         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1643
1644 # Modules
1645 /: prepare scripts FORCE
1646         $(cmd_crmodverdir)
1647         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1648         $(build)=$(build-dir)
1649 # Make sure the latest headers are built for Documentation
1650 Documentation/ samples/: headers_install
1651 %/: prepare scripts FORCE
1652         $(cmd_crmodverdir)
1653         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1654         $(build)=$(build-dir)
1655 %.ko: prepare scripts FORCE
1656         $(cmd_crmodverdir)
1657         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1658         $(build)=$(build-dir) $(@:.ko=.o)
1659         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1660
1661 # FIXME Should go into a make.lib or something
1662 # ===========================================================================
1663
1664 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1665       cmd_rmdirs = rm -rf $(rm-dirs)
1666
1667 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1668       cmd_rmfiles = rm -f $(rm-files)
1669
1670 # Run depmod only if we have System.map and depmod is executable
1671 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1672       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1673                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1674
1675 # Create temporary dir for module support files
1676 # clean it up only when building all modules
1677 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1678                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1679
1680 # read all saved command lines
1681
1682 targets := $(wildcard $(sort $(targets)))
1683 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1684
1685 ifneq ($(cmd_files),)
1686   $(cmd_files): ;       # Do not try to update included dependency files
1687   include $(cmd_files)
1688 endif
1689
1690 endif   # skip-makefile
1691
1692 PHONY += FORCE
1693 FORCE:
1694
1695 # Declare the contents of the .PHONY variable as phony.  We keep that
1696 # information in a variable so we can use it in if_changed and friends.
1697 .PHONY: $(PHONY)