Makefile

   1 VERSION = 3
   2 PATCHLEVEL = 10
   3 SUBLEVEL = 51
   4 EXTRAVERSION =
   5 NAME = TOSSUG Baby Fish
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # Do not:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoids hard-to-debug behaviour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # Avoid funny character set dependencies
  20 unexport LC_ALL
  21 LC_COLLATE=C
  22 LC_NUMERIC=C
  23 export LC_COLLATE LC_NUMERIC
  24
  25 # We are using a recursive build, so we need to do a little thinking
  26 # to get the ordering right.
  27 #
  28 # Most importantly: sub-Makefiles should only ever modify files in
  29 # their own directory. If in some directory we have a dependency on
  30 # a file in another dir (which doesn't happen often, but it's often
  31 # unavoidable when linking the built-in.o targets which finally
  32 # turn into vmlinux), we will call a sub make in that other dir, and
  33 # after that we are sure that everything which is in that other dir
  34 # is now up to date.
  35 #
  36 # The only cases where we need to modify files which have global
  37 # effects are thus separated out and done before the recursive
  38 # descending is started. They are now explicitly listed as the
  39 # prepare rule.
  40
  41 # To put more focus on warnings, be less verbose as default
  42 # Use 'make V=1' to see the full commands
  43
  44 ifeq ("$(origin V)", "command line")
  45   KBUILD_VERBOSE = $(V)
  46 endif
  47 ifndef KBUILD_VERBOSE
  48   KBUILD_VERBOSE = 0
  49 endif
  50
  51 # Call a source code checker (by default, "sparse") as part of the
  52 # C compilation.
  53 #
  54 # Use 'make C=1' to enable checking of only re-compiled files.
  55 # Use 'make C=2' to enable checking of *all* source files, regardless
  56 # of whether they are re-compiled or not.
  57 #
  58 # See the file "Documentation/sparse.txt" for more details, including
  59 # where to get the "sparse" utility.
  60
  61 ifeq ("$(origin C)", "command line")
  62   KBUILD_CHECKSRC = $(C)
  63 endif
  64 ifndef KBUILD_CHECKSRC
  65   KBUILD_CHECKSRC = 0
  66 endif
  67
  68 # Use make M=dir to specify directory of external module to build
  69 # Old syntax make ... SUBDIRS=$PWD is still supported
  70 # Setting the environment variable KBUILD_EXTMOD take precedence
  71 ifdef SUBDIRS
  72   KBUILD_EXTMOD ?= $(SUBDIRS)
  73 endif
  74
  75 ifeq ("$(origin M)", "command line")
  76   KBUILD_EXTMOD := $(M)
  77 endif
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(KBUILD_SRC),)
  98
  99 # OK, Make called in directory where kernel src resides
 100 # Do we want to locate output files in a separate directory?
 101 ifeq ("$(origin O)", "command line")
 102   KBUILD_OUTPUT := $(O)
 103 endif
 104
 105 ifeq ("$(origin W)", "command line")
 106   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 107 endif
 108
 109 # That's our default target when none is given on the command line
 110 PHONY := _all
 111 _all:
 112
 113 # Cancel implicit rules on top Makefile
 114 $(CURDIR)/Makefile Makefile: ;
 115
 116 ifneq ($(KBUILD_OUTPUT),)
 117 # Invoke a second make in the output directory, passing relevant variables
 118 # check that the output directory actually exists
 119 saved-output := $(KBUILD_OUTPUT)
 120 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 121 $(if $(KBUILD_OUTPUT),, \
 122      $(error output directory "$(saved-output)" does not exist))
 123
 124 PHONY += $(MAKECMDGOALS) sub-make
 125
 126 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 127         @:
 128
 129 sub-make: FORCE
 130         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 131         KBUILD_SRC=$(CURDIR) \
 132         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 133         $(filter-out _all sub-make,$(MAKECMDGOALS))
 134
 135 # Leave processing to above invocation of make
 136 skip-makefile := 1
 137 endif # ifneq ($(KBUILD_OUTPUT),)
 138 endif # ifeq ($(KBUILD_SRC),)
 139
 140 # We process the rest of the Makefile if this is the final invocation of make
 141 ifeq ($(skip-makefile),)
 142
 143 # If building an external module we do not care about the all: rule
 144 # but instead _all depend on modules
 145 PHONY += all
 146 ifeq ($(KBUILD_EXTMOD),)
 147 _all: all
 148 else
 149 _all: modules
 150 endif
 151
 152 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 153 objtree         := $(CURDIR)
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH
 160
 161
 162 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 163 # first, and if a usermode build is happening, the "ARCH=um" on the command
 164 # line overrides the setting of ARCH below.  If a native build is happening,
 165 # then ARCH is assigned, getting whatever value it gets normally, and
 166 # SUBARCH is subsequently ignored.
 167
 168 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 169                                   -e s/sun4u/sparc64/ \
 170                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 171                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 172                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 173                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 174
 175 # Cross compiling and selecting different set of gcc/bin-utils
 176 # ---------------------------------------------------------------------------
 177 #
 178 # When performing cross compilation for other architectures ARCH shall be set
 179 # to the target architecture. (See arch/* for the possibilities).
 180 # ARCH can be set during invocation of make:
 181 # make ARCH=ia64
 182 # Another way is to have ARCH set in the environment.
 183 # The default ARCH is the host where make is executed.
 184
 185 # CROSS_COMPILE specify the prefix used for all executables used
 186 # during compilation. Only gcc and related bin-utils executables
 187 # are prefixed with $(CROSS_COMPILE).
 188 # CROSS_COMPILE can be set on the command line
 189 # make CROSS_COMPILE=ia64-linux-
 190 # Alternatively CROSS_COMPILE can be set in the environment.
 191 # A third alternative is to store a setting in .config so that plain
 192 # "make" in the configured kernel build directory always uses that.
 193 # Default value for CROSS_COMPILE is not to prefix executables
 194 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 195 ARCH            ?= $(SUBARCH)
 196 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 197
 198 # Architecture as present in compile.h
 199 UTS_MACHINE     := $(ARCH)
 200 SRCARCH         := $(ARCH)
 201
 202 # Additional ARCH settings for x86
 203 ifeq ($(ARCH),i386)
 204         SRCARCH := x86
 205 endif
 206 ifeq ($(ARCH),x86_64)
 207         SRCARCH := x86
 208 endif
 209
 210 # Additional ARCH settings for sparc
 211 ifeq ($(ARCH),sparc32)
 212        SRCARCH := sparc
 213 endif
 214 ifeq ($(ARCH),sparc64)
 215        SRCARCH := sparc
 216 endif
 217
 218 # Additional ARCH settings for sh
 219 ifeq ($(ARCH),sh64)
 220        SRCARCH := sh
 221 endif
 222
 223 # Additional ARCH settings for tile
 224 ifeq ($(ARCH),tilepro)
 225        SRCARCH := tile
 226 endif
 227 ifeq ($(ARCH),tilegx)
 228        SRCARCH := tile
 229 endif
 230
 231 # Where to locate arch specific headers
 232 hdr-arch  := $(SRCARCH)
 233
 234 KCONFIG_CONFIG  ?= .config
 235 export KCONFIG_CONFIG
 236
 237 # SHELL used by kbuild
 238 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 239           else if [ -x /bin/bash ]; then echo /bin/bash; \
 240           else echo sh; fi ; fi)
 241
 242 HOSTCC       = gcc
 243 HOSTCXX      = g++
 244 HOSTCFLAGS   = -Wall -W -Wmissing-prototypes -Wstrict-prototypes -Wno-unused-parameter -Wno-missing-field-initializers -O2 -fomit-frame-pointer -fno-delete-null-pointer-checks
 245 HOSTCFLAGS  += $(call cc-option, -Wno-empty-body)
 246 HOSTCXXFLAGS = -O2 -Wall -W -fno-delete-null-pointer-checks
 247
 248 # Decide whether to build built-in, modular, or both.
 249 # Normally, just do built-in.
 250
 251 KBUILD_MODULES :=
 252 KBUILD_BUILTIN := 1
 253
 254 #       If we have only "make modules", don't compile built-in objects.
 255 #       When we're building modules with modversions, we need to consider
 256 #       the built-in objects during the descend as well, in order to
 257 #       make sure the checksums are up to date before we record them.
 258
 259 ifeq ($(MAKECMDGOALS),modules)
 260   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 261 endif
 262
 263 #       If we have "make <whatever> modules", compile modules
 264 #       in addition to whatever we do anyway.
 265 #       Just "make" or "make all" shall build modules as well
 266
 267 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 268   KBUILD_MODULES := 1
 269 endif
 270
 271 ifeq ($(MAKECMDGOALS),)
 272   KBUILD_MODULES := 1
 273 endif
 274
 275 export KBUILD_MODULES KBUILD_BUILTIN
 276 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 277
 278 # Beautify output
 279 # ---------------------------------------------------------------------------
 280 #
 281 # Normally, we echo the whole command before executing it. By making
 282 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 283 # $(quiet) to choose other forms of output instead, e.g.
 284 #
 285 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 286 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 287 #
 288 # If $(quiet) is empty, the whole command will be printed.
 289 # If it is set to "quiet_", only the short version will be printed.
 290 # If it is set to "silent_", nothing will be printed at all, since
 291 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 292 #
 293 # A simple variant is to prefix commands with $(Q) - that's useful
 294 # for commands that shall be hidden in non-verbose mode.
 295 #
 296 #       $(Q)ln $@ :<
 297 #
 298 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 299 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 300
 301 ifeq ($(KBUILD_VERBOSE),1)
 302   quiet =
 303   Q =
 304 else
 305   quiet=quiet_
 306   Q = @
 307 endif
 308
 309 # If the user is running make -s (silent mode), suppress echoing of
 310 # commands
 311
 312 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 313   quiet=silent_
 314 endif
 315
 316 export quiet Q KBUILD_VERBOSE
 317
 318
 319 # Look for make include files relative to root of kernel src
 320 MAKEFLAGS += --include-dir=$(srctree)
 321
 322 # We need some generic definitions (do not try to remake the file).
 323 $(srctree)/scripts/Kbuild.include: ;
 324 include $(srctree)/scripts/Kbuild.include
 325
 326 # Make variables (CC, etc...)
 327
 328 AS              = $(CROSS_COMPILE)as
 329 LD              = $(CROSS_COMPILE)ld
 330 CC              = $(CROSS_COMPILE)gcc
 331 CPP             = $(CC) -E
 332 AR              = $(CROSS_COMPILE)ar
 333 NM              = $(CROSS_COMPILE)nm
 334 STRIP           = $(CROSS_COMPILE)strip
 335 OBJCOPY         = $(CROSS_COMPILE)objcopy
 336 OBJDUMP         = $(CROSS_COMPILE)objdump
 337 AWK             = awk
 338 GENKSYMS        = scripts/genksyms/genksyms
 339 INSTALLKERNEL  := installkernel
 340 DEPMOD          = /sbin/depmod
 341 PERL            = perl
 342 CHECK           = sparse
 343
 344 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 345                   -Wbitwise -Wno-return-void $(CF)
 346 CFLAGS_MODULE   =
 347 AFLAGS_MODULE   =
 348 LDFLAGS_MODULE  =
 349 CFLAGS_KERNEL   =
 350 AFLAGS_KERNEL   =
 351 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 352
 353
 354 # Use USERINCLUDE when you must reference the UAPI directories only.
 355 USERINCLUDE    := \
 356                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 357                 -Iarch/$(hdr-arch)/include/generated/uapi \
 358                 -I$(srctree)/include/uapi \
 359                 -Iinclude/generated/uapi \
 360                 -include $(srctree)/include/linux/kconfig.h
 361
 362 # Use LINUXINCLUDE when you must reference the include/ directory.
 363 # Needed to be compatible with the O= option
 364 LINUXINCLUDE    := \
 365                 -I$(srctree)/arch/$(hdr-arch)/include \
 366                 -Iarch/$(hdr-arch)/include/generated \
 367                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 368                 -Iinclude \
 369                 $(USERINCLUDE)
 370
 371 KBUILD_CPPFLAGS := -D__KERNEL__
 372
 373 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 374                    -fno-strict-aliasing -fno-common \
 375                    -Werror-implicit-function-declaration \
 376                    -Wno-format-security \
 377                    -fno-delete-null-pointer-checks
 378 KBUILD_AFLAGS_KERNEL :=
 379 KBUILD_CFLAGS_KERNEL :=
 380 KBUILD_AFLAGS   := -D__ASSEMBLY__
 381 KBUILD_AFLAGS_MODULE  := -DMODULE
 382 KBUILD_CFLAGS_MODULE  := -DMODULE
 383 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 384
 385 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 386 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 387 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 388
 389 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 390 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 391 export CPP AR NM STRIP OBJCOPY OBJDUMP
 392 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 393 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 394
 395 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 396 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 397 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 398 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 399 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 400 export KBUILD_ARFLAGS
 401
 402 # When compiling out-of-tree modules, put MODVERDIR in the module
 403 # tree rather than in the kernel tree. The kernel tree might
 404 # even be read-only.
 405 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 406
 407 # Files to ignore in find ... statements
 408
 409 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
 410                    -o -name .pc -o -name .hg -o -name .git \) -prune -o
 411 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 412                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 413
 414 # ===========================================================================
 415 # Rules shared between *config targets and build targets
 416
 417 # Basic helpers built in scripts/
 418 PHONY += scripts_basic gcc-plugins
 419 scripts_basic: gcc-plugins
 420         $(Q)$(MAKE) $(build)=scripts/basic
 421         $(Q)rm -f .tmp_quiet_recordmcount
 422
 423 # To avoid any implicit rule to kick in, define an empty command.
 424 scripts/basic/%: scripts_basic ;
 425
 426 PHONY += outputmakefile
 427 # outputmakefile generates a Makefile in the output directory, if using a
 428 # separate output directory. This allows convenient use of make in the
 429 # output directory.
 430 outputmakefile:
 431 ifneq ($(KBUILD_SRC),)
 432         $(Q)ln -fsn $(srctree) source
 433         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 434             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 435 endif
 436
 437 # Support for using generic headers in asm-generic
 438 PHONY += asm-generic
 439 asm-generic:
 440         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 441                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 442         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 443                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 444
 445 # To make sure we do not include .config for any of the *config targets
 446 # catch them early, and hand them over to scripts/kconfig/Makefile
 447 # It is allowed to specify more targets when calling make, including
 448 # mixing *config targets and build targets.
 449 # For example 'make oldconfig all'.
 450 # Detect when mixed targets is specified, and make a second invocation
 451 # of make so .config is not included in this case either (for *config).
 452
 453 version_h := include/generated/uapi/linux/version.h
 454
 455 no-dot-config-targets := clean mrproper distclean \
 456                          cscope gtags TAGS tags help %docs check% coccicheck \
 457                          $(version_h) headers_% archheaders archscripts \
 458                          kernelversion %src-pkg
 459
 460 config-targets := 0
 461 mixed-targets  := 0
 462 dot-config     := 1
 463
 464 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 465         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 466                 dot-config := 0
 467         endif
 468 endif
 469
 470 ifeq ($(KBUILD_EXTMOD),)
 471         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 472                 config-targets := 1
 473                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 474                         mixed-targets := 1
 475                 endif
 476         endif
 477 endif
 478
 479 ifeq ($(mixed-targets),1)
 480 # ===========================================================================
 481 # We're called with mixed targets (*config and build targets).
 482 # Handle them one by one.
 483
 484 %:: FORCE
 485         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 486
 487 else
 488 ifeq ($(config-targets),1)
 489 # ===========================================================================
 490 # *config targets only - make sure prerequisites are updated, and descend
 491 # in scripts/kconfig to make the *config target
 492
 493 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 494 # KBUILD_DEFCONFIG may point out an alternative default configuration
 495 # used for 'make defconfig'
 496 include $(srctree)/arch/$(SRCARCH)/Makefile
 497 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 498
 499 config: scripts_basic outputmakefile FORCE
 500         $(Q)mkdir -p include/linux include/config
 501         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 502
 503 %config: scripts_basic outputmakefile FORCE
 504         $(Q)mkdir -p include/linux include/config
 505         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 506
 507 else
 508 # ===========================================================================
 509 # Build targets only - this includes vmlinux, arch specific targets, clean
 510 # targets and others. In general all targets except *config targets.
 511
 512 ifeq ($(KBUILD_EXTMOD),)
 513 # Additional helpers built in scripts/
 514 # Carefully list dependencies so we do not try to build scripts twice
 515 # in parallel
 516 PHONY += scripts
 517 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 518          asm-generic
 519         $(Q)$(MAKE) $(build)=$(@)
 520
 521 # Objects we will link into vmlinux / subdirs we need to visit
 522 init-y          := init/
 523 drivers-y       := drivers/ sound/ firmware/
 524 net-y           := net/
 525 libs-y          := lib/
 526 core-y          := usr/
 527 endif # KBUILD_EXTMOD
 528
 529 ifeq ($(dot-config),1)
 530 # Read in config
 531 -include include/config/auto.conf
 532
 533 ifeq ($(KBUILD_EXTMOD),)
 534 # Read in dependencies to all Kconfig* files, make sure to run
 535 # oldconfig if changes are detected.
 536 -include include/config/auto.conf.cmd
 537
 538 # To avoid any implicit rule to kick in, define an empty command
 539 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 540
 541 # If .config is newer than include/config/auto.conf, someone tinkered
 542 # with it and forgot to run make oldconfig.
 543 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 544 # we execute the config step to be sure to catch updated Kconfig files
 545 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 546         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 547 else
 548 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 549 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 550 PHONY += include/config/auto.conf
 551
 552 include/config/auto.conf:
 553         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 554         echo >&2;                                                       \
 555         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 556         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 557         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 558         echo >&2 ;                                                      \
 559         /bin/false)
 560
 561 endif # KBUILD_EXTMOD
 562
 563 else
 564 # Dummy target needed, because used as prerequisite
 565 include/config/auto.conf: ;
 566 endif # $(dot-config)
 567
 568 # The all: target is the default when no target is given on the
 569 # command line.
 570 # This allow a user to issue only 'make' to build a kernel including modules
 571 # Defaults to vmlinux, but the arch makefile usually adds further targets
 572 all: vmlinux
 573
 574 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 575 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 576 else
 577 KBUILD_CFLAGS   += -O2
 578 endif
 579
 580 ifndef DISABLE_PAX_PLUGINS
 581 ifeq ($(call cc-ifversion, -ge, 0408, y), y)
 582 PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(HOSTCXX)" "$(HOSTCXX)" "$(CC)")
 583 else
 584 PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(HOSTCC)" "$(HOSTCXX)" "$(CC)")
 585 endif
 586 ifneq ($(PLUGINCC),)
 587 ifdef CONFIG_PAX_CONSTIFY_PLUGIN
 588 CONSTIFY_PLUGIN_CFLAGS := -fplugin=$(objtree)/tools/gcc/constify_plugin.so -DCONSTIFY_PLUGIN
 589 endif
 590 ifdef CONFIG_PAX_MEMORY_STACKLEAK
 591 STACKLEAK_PLUGIN_CFLAGS := -fplugin=$(objtree)/tools/gcc/stackleak_plugin.so -DSTACKLEAK_PLUGIN
 592 STACKLEAK_PLUGIN_CFLAGS += -fplugin-arg-stackleak_plugin-track-lowest-sp=100
 593 endif
 594 ifdef CONFIG_KALLOCSTAT_PLUGIN
 595 KALLOCSTAT_PLUGIN_CFLAGS := -fplugin=$(objtree)/tools/gcc/kallocstat_plugin.so
 596 endif
 597 ifdef CONFIG_PAX_KERNEXEC_PLUGIN
 598 KERNEXEC_PLUGIN_CFLAGS := -fplugin=$(objtree)/tools/gcc/kernexec_plugin.so
 599 KERNEXEC_PLUGIN_CFLAGS += -fplugin-arg-kernexec_plugin-method=$(CONFIG_PAX_KERNEXEC_PLUGIN_METHOD) -DKERNEXEC_PLUGIN
 600 KERNEXEC_PLUGIN_AFLAGS := -DKERNEXEC_PLUGIN
 601 endif
 602 ifdef CONFIG_CHECKER_PLUGIN
 603 ifeq ($(call cc-ifversion, -ge, 0406, y), y)
 604 CHECKER_PLUGIN_CFLAGS := -fplugin=$(objtree)/tools/gcc/checker_plugin.so -DCHECKER_PLUGIN
 605 endif
 606 endif
 607 COLORIZE_PLUGIN_CFLAGS := -fplugin=$(objtree)/tools/gcc/colorize_plugin.so
 608 ifdef CONFIG_PAX_SIZE_OVERFLOW
 609 SIZE_OVERFLOW_PLUGIN_CFLAGS := -fplugin=$(objtree)/tools/gcc/size_overflow_plugin.so -DSIZE_OVERFLOW_PLUGIN
 610 endif
 611 ifdef CONFIG_PAX_LATENT_ENTROPY
 612 LATENT_ENTROPY_PLUGIN_CFLAGS := -fplugin=$(objtree)/tools/gcc/latent_entropy_plugin.so -DLATENT_ENTROPY_PLUGIN
 613 endif
 614 ifdef CONFIG_PAX_MEMORY_STRUCTLEAK
 615 STRUCTLEAK_PLUGIN_CFLAGS := -fplugin=$(objtree)/tools/gcc/structleak_plugin.so -DSTRUCTLEAK_PLUGIN
 616 endif
 617 GCC_PLUGINS_CFLAGS := $(CONSTIFY_PLUGIN_CFLAGS) $(STACKLEAK_PLUGIN_CFLAGS) $(KALLOCSTAT_PLUGIN_CFLAGS)
 618 GCC_PLUGINS_CFLAGS += $(KERNEXEC_PLUGIN_CFLAGS) $(CHECKER_PLUGIN_CFLAGS) $(COLORIZE_PLUGIN_CFLAGS)
 619 GCC_PLUGINS_CFLAGS += $(SIZE_OVERFLOW_PLUGIN_CFLAGS) $(LATENT_ENTROPY_PLUGIN_CFLAGS) $(STRUCTLEAK_PLUGIN_CFLAGS)
 620 GCC_PLUGINS_AFLAGS := $(KERNEXEC_PLUGIN_AFLAGS)
 621 export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGINS_AFLAGS CONSTIFY_PLUGIN
 622 ifeq ($(KBUILD_EXTMOD),)
 623 gcc-plugins:
 624         $(Q)$(MAKE) $(build)=tools/gcc
 625 else
 626 gcc-plugins: ;
 627 endif
 628 else
 629 gcc-plugins:
 630 ifeq ($(call cc-ifversion, -ge, 0405, y), y)
 631         $(error Your gcc installation does not support plugins.  If the necessary headers for plugin support are missing, they should be installed.  On Debian, apt-get install gcc-<ver>-plugin-dev.  If you choose to ignore this error and lessen the improvements provided by this patch, re-run make with the DISABLE_PAX_PLUGINS=y argument.))
 632 else
 633         $(Q)echo "warning, your gcc version does not support plugins, you should upgrade it to gcc 4.5 at least"
 634 endif
 635         $(Q)echo "PAX_MEMORY_STACKLEAK, constification, PAX_LATENT_ENTROPY and other features will be less secure.  PAX_SIZE_OVERFLOW will not be active."
 636 endif
 637 endif
 638
 639 include $(srctree)/arch/$(SRCARCH)/Makefile
 640
 641 ifdef CONFIG_READABLE_ASM
 642 # Disable optimizations that make assembler listings hard to read.
 643 # reorder blocks reorders the control in the function
 644 # ipa clone creates specialized cloned functions
 645 # partial inlining inlines only parts of functions
 646 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 647                  $(call cc-option,-fno-ipa-cp-clone,) \
 648                  $(call cc-option,-fno-partial-inlining)
 649 endif
 650
 651 ifneq ($(CONFIG_FRAME_WARN),0)
 652 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 653 endif
 654
 655 # Force gcc to behave correct even for buggy distributions
 656 ifndef CONFIG_CC_STACKPROTECTOR
 657 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 658 endif
 659
 660 # This warning generated too much noise in a regular build.
 661 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 662 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 663
 664 ifdef CONFIG_FRAME_POINTER
 665 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 666 else
 667 # Some targets (ARM with Thumb2, for example), can't be built with frame
 668 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 669 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 670 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 671 # -fomit-frame-pointer with FUNCTION_TRACER.
 672 ifndef CONFIG_FUNCTION_TRACER
 673 KBUILD_CFLAGS   += -fomit-frame-pointer
 674 endif
 675 endif
 676
 677 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 678
 679 ifdef CONFIG_DEBUG_INFO
 680 KBUILD_CFLAGS   += -g
 681 KBUILD_AFLAGS   += -gdwarf-2
 682 endif
 683
 684 ifdef CONFIG_DEBUG_INFO_REDUCED
 685 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 686                    $(call cc-option,-fno-var-tracking)
 687 endif
 688
 689 ifdef CONFIG_FUNCTION_TRACER
 690 ifdef CONFIG_HAVE_FENTRY
 691 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 692 endif
 693 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
 694 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 695 ifdef CONFIG_DYNAMIC_FTRACE
 696         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 697                 BUILD_C_RECORDMCOUNT := y
 698                 export BUILD_C_RECORDMCOUNT
 699         endif
 700 endif
 701 endif
 702
 703 # We trigger additional mismatches with less inlining
 704 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 705 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 706 endif
 707
 708 # arch Makefile may override CC so keep this after arch Makefile is included
 709 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 710 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 711
 712 # warn about C99 declaration after statement
 713 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 714
 715 # disable pointer signed / unsigned warnings in gcc 4.0
 716 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 717
 718 # disable invalid "can't wrap" optimizations for signed / pointers
 719 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 720
 721 # conserve stack if available
 722 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 723
 724 # use the deterministic mode of AR if available
 725 KBUILD_ARFLAGS := $(call ar-option,D)
 726
 727 # check for 'asm goto'
 728 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 729         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 730 endif
 731
 732 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 733 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 734 KBUILD_AFLAGS += $(KAFLAGS)
 735 KBUILD_CFLAGS += $(KCFLAGS)
 736
 737 # Use --build-id when available.
 738 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 739                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 740 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 741 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 742
 743 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 744 LDFLAGS_vmlinux += $(call ld-option, -X,)
 745 endif
 746
 747 # Default kernel image to build when no specific target is given.
 748 # KBUILD_IMAGE may be overruled on the command line or
 749 # set in the environment
 750 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 751 # this default value
 752 export KBUILD_IMAGE ?= vmlinux
 753
 754 #
 755 # INSTALL_PATH specifies where to place the updated kernel and system map
 756 # images. Default is /boot, but you can set it to other values
 757 export  INSTALL_PATH ?= /boot
 758
 759 #
 760 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 761 # relocations required by build roots.  This is not defined in the
 762 # makefile but the argument can be passed to make if needed.
 763 #
 764
 765 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 766 export MODLIB
 767
 768 #
 769 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 770 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 771 #  the default option --strip-debug will be used.  Otherwise,
 772 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 773
 774 ifdef INSTALL_MOD_STRIP
 775 ifeq ($(INSTALL_MOD_STRIP),1)
 776 mod_strip_cmd = $(STRIP) --strip-debug
 777 else
 778 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 779 endif # INSTALL_MOD_STRIP=1
 780 else
 781 mod_strip_cmd = true
 782 endif # INSTALL_MOD_STRIP
 783 export mod_strip_cmd
 784
 785
 786 ifdef CONFIG_MODULE_SIG_ALL
 787 MODSECKEY = ./signing_key.priv
 788 MODPUBKEY = ./signing_key.x509
 789 export MODPUBKEY
 790 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
 791 else
 792 mod_sign_cmd = true
 793 endif
 794 export mod_sign_cmd
 795
 796
 797 ifeq ($(KBUILD_EXTMOD),)
 798 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ grsecurity/
 799
 800 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 801                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 802                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 803
 804 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 805                      $(init-n) $(init-) \
 806                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 807                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 808
 809 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 810 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 811 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 812 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 813 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 814 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 815 libs-y          := $(libs-y1) $(libs-y2)
 816
 817 # Externally visible symbols (used by link-vmlinux.sh)
 818 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 819 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 820 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 821 export LDFLAGS_vmlinux
 822 # used by scripts/pacmage/Makefile
 823 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
 824
 825 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 826
 827 # Final link of vmlinux
 828       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 829 quiet_cmd_link-vmlinux = LINK    $@
 830
 831 # Include targets which we want to
 832 # execute if the rest of the kernel build went well.
 833 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 834 ifdef CONFIG_HEADERS_CHECK
 835         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 836 endif
 837 ifdef CONFIG_SAMPLES
 838         $(Q)$(MAKE) $(build)=samples
 839 endif
 840 ifdef CONFIG_BUILD_DOCSRC
 841         $(Q)$(MAKE) $(build)=Documentation
 842 endif
 843         +$(call if_changed,link-vmlinux)
 844
 845 # The actual objects are generated when descending,
 846 # make sure no implicit rule kicks in
 847 $(filter-out $(init-y),$(vmlinux-deps)): KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
 848 $(filter-out $(init-y),$(vmlinux-deps)): KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
 849 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 850
 851 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 852 # Preset locale variables to speed up the build process. Limit locale
 853 # tweaks to this spot to avoid wrong language settings when running
 854 # make menuconfig etc.
 855 # Error messages still appears in the original language
 856
 857 PHONY += $(vmlinux-dirs)
 858 $(vmlinux-dirs): gcc-plugins prepare scripts
 859         $(Q)$(MAKE) $(build)=$@
 860
 861 # Store (new) KERNELRELASE string in include/config/kernel.release
 862 include/config/kernel.release: include/config/auto.conf FORCE
 863         $(Q)rm -f $@
 864         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 865
 866
 867 # Things we need to do before we recursively start building the kernel
 868 # or the modules are listed in "prepare".
 869 # A multi level approach is used. prepareN is processed before prepareN-1.
 870 # archprepare is used in arch Makefiles and when processed asm symlink,
 871 # version.h and scripts_basic is processed / created.
 872
 873 # Listed in dependency order
 874 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 875
 876 # prepare3 is used to check if we are building in a separate output directory,
 877 # and if so do:
 878 # 1) Check that make has not been executed in the kernel src $(srctree)
 879 prepare3: include/config/kernel.release
 880 ifneq ($(KBUILD_SRC),)
 881         @$(kecho) '  Using $(srctree) as source for kernel'
 882         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 883                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 884                 echo >&2 "  in the '$(srctree)' directory.";\
 885                 /bin/false; \
 886         fi;
 887 endif
 888
 889 # prepare2 creates a makefile if using a separate output directory
 890 prepare2: prepare3 outputmakefile asm-generic
 891
 892 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 893                    include/config/auto.conf
 894         $(cmd_crmodverdir)
 895
 896 archprepare: archheaders archscripts prepare1 scripts_basic
 897
 898 prepare0: archprepare FORCE
 899         $(Q)$(MAKE) $(build)=.
 900
 901 # All the preparing..
 902 prepare: KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
 903 prepare: prepare0
 904
 905 # Generate some files
 906 # ---------------------------------------------------------------------------
 907
 908 # KERNELRELEASE can change from a few different places, meaning version.h
 909 # needs to be updated, so this check is forced on all builds
 910
 911 uts_len := 64
 912 define filechk_utsrelease.h
 913         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 914           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 915           exit 1;                                                         \
 916         fi;                                                               \
 917         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 918 endef
 919
 920 define filechk_version.h
 921         (echo \#define LINUX_VERSION_CODE $(shell                         \
 922         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 923         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 924 endef
 925
 926 $(version_h): $(srctree)/Makefile FORCE
 927         $(call filechk,version.h)
 928
 929 include/generated/utsrelease.h: include/config/kernel.release FORCE
 930         $(call filechk,utsrelease.h)
 931
 932 PHONY += headerdep
 933 headerdep:
 934         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 935         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 936
 937 # ---------------------------------------------------------------------------
 938
 939 PHONY += depend dep
 940 depend dep:
 941         @echo '*** Warning: make $@ is unnecessary now.'
 942
 943 # ---------------------------------------------------------------------------
 944 # Firmware install
 945 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 946 export INSTALL_FW_PATH
 947
 948 PHONY += firmware_install
 949 firmware_install: FORCE
 950         @mkdir -p $(objtree)/firmware
 951         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 952
 953 # ---------------------------------------------------------------------------
 954 # Kernel headers
 955
 956 #Default location for installed headers
 957 export INSTALL_HDR_PATH = $(objtree)/usr
 958
 959 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 960
 961 # If we do an all arch process set dst to asm-$(hdr-arch)
 962 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 963
 964 PHONY += archheaders
 965 archheaders:
 966
 967 PHONY += archscripts
 968 archscripts:
 969
 970 PHONY += __headers
 971 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
 972         $(Q)$(MAKE) $(build)=scripts build_unifdef
 973
 974 PHONY += headers_install_all
 975 headers_install_all:
 976         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
 977
 978 PHONY += headers_install
 979 headers_install: __headers
 980         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
 981           $(error Headers not exportable for the $(SRCARCH) architecture))
 982         $(Q)$(MAKE) $(hdr-inst)=include/uapi
 983         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
 984
 985 PHONY += headers_check_all
 986 headers_check_all: headers_install_all
 987         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
 988
 989 PHONY += headers_check
 990 headers_check: headers_install
 991         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
 992         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
 993
 994 # ---------------------------------------------------------------------------
 995 # Modules
 996
 997 ifdef CONFIG_MODULES
 998
 999 # By default, build modules as well
1000
1001 all: modules
1002
1003 #       Build modules
1004 #
1005 #       A module can be listed more than once in obj-m resulting in
1006 #       duplicate lines in modules.order files.  Those are removed
1007 #       using awk while concatenating to the final file.
1008
1009 PHONY += modules
1010 modules: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
1011 modules: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
1012 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1013         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1014         @$(kecho) '  Building modules, stage 2.';
1015         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1016         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1017
1018 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1019         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1020
1021 %/modules.builtin: include/config/auto.conf
1022         $(Q)$(MAKE) $(modbuiltin)=$*
1023
1024
1025 # Target to prepare building external modules
1026 PHONY += modules_prepare
1027 modules_prepare: gcc-plugins prepare scripts
1028
1029 # Target to install modules
1030 PHONY += modules_install
1031 modules_install: _modinst_ _modinst_post
1032
1033 PHONY += _modinst_
1034 _modinst_:
1035         @rm -rf $(MODLIB)/kernel
1036         @rm -f $(MODLIB)/source
1037         @mkdir -p $(MODLIB)/kernel
1038         @ln -s $(srctree) $(MODLIB)/source
1039         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1040                 rm -f $(MODLIB)/build ; \
1041                 ln -s $(objtree) $(MODLIB)/build ; \
1042         fi
1043         @cp -f $(objtree)/modules.order $(MODLIB)/
1044         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1045         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1046
1047 # This depmod is only for convenience to give the initial
1048 # boot a modules.dep even before / is mounted read-write.  However the
1049 # boot script depmod is the master version.
1050 PHONY += _modinst_post
1051 _modinst_post: _modinst_
1052         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1053         $(call cmd,depmod)
1054
1055 ifeq ($(CONFIG_MODULE_SIG), y)
1056 PHONY += modules_sign
1057 modules_sign:
1058         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1059 endif
1060
1061 else # CONFIG_MODULES
1062
1063 # Modules not configured
1064 # ---------------------------------------------------------------------------
1065
1066 modules modules_install: FORCE
1067         @echo >&2
1068         @echo >&2 "The present kernel configuration has modules disabled."
1069         @echo >&2 "Type 'make config' and enable loadable module support."
1070         @echo >&2 "Then build a kernel with module support enabled."
1071         @echo >&2
1072         @exit 1
1073
1074 endif # CONFIG_MODULES
1075
1076 ###
1077 # Cleaning is done on three levels.
1078 # make clean     Delete most generated files
1079 #                Leave enough to build external modules
1080 # make mrproper  Delete the current configuration, and all generated files
1081 # make distclean Remove editor backup files, patch leftover files and the like
1082
1083 # Directories & files removed with 'make clean'
1084 CLEAN_DIRS  += $(MODVERDIR)
1085
1086 # Directories & files removed with 'make mrproper'
1087 MRPROPER_DIRS  += include/config usr/include include/generated          \
1088                   arch/*/include/generated
1089 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1090                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1091                   signing_key.priv signing_key.x509 x509.genkey         \
1092                   extra_certificates signing_key.x509.keyid             \
1093                   signing_key.x509.signer tools/gcc/size_overflow_hash.h
1094
1095 # clean - Delete most, but leave enough to build external modules
1096 #
1097 clean: rm-dirs  := $(CLEAN_DIRS)
1098 clean: rm-files := $(CLEAN_FILES)
1099 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1100
1101 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1102 $(clean-dirs):
1103         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1104
1105 vmlinuxclean:
1106         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1107
1108 clean: archclean vmlinuxclean
1109
1110 # mrproper - Delete all generated files, including .config
1111 #
1112 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1113 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1114 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1115
1116 PHONY += $(mrproper-dirs) mrproper archmrproper
1117 $(mrproper-dirs):
1118         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1119
1120 mrproper: clean archmrproper $(mrproper-dirs)
1121         $(call cmd,rmdirs)
1122         $(call cmd,rmfiles)
1123
1124 # distclean
1125 #
1126 PHONY += distclean
1127
1128 distclean: mrproper
1129         @find $(srctree) $(RCS_FIND_IGNORE) \
1130                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1131                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1132                 -o -name '.*.rej' \
1133                 -o -name '.*.rej' -o -name '*.so' \
1134                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1135                 -type f -print | xargs rm -f
1136
1137
1138 # Packaging of the kernel to various formats
1139 # ---------------------------------------------------------------------------
1140 # rpm target kept for backward compatibility
1141 package-dir     := $(srctree)/scripts/package
1142
1143 %src-pkg: FORCE
1144         $(Q)$(MAKE) $(build)=$(package-dir) $@
1145 %pkg: include/config/kernel.release FORCE
1146         $(Q)$(MAKE) $(build)=$(package-dir) $@
1147 rpm: include/config/kernel.release FORCE
1148         $(Q)$(MAKE) $(build)=$(package-dir) $@
1149
1150
1151 # Brief documentation of the typical targets used
1152 # ---------------------------------------------------------------------------
1153
1154 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1155 boards := $(notdir $(boards))
1156 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1157 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1158
1159 help:
1160         @echo  'Cleaning targets:'
1161         @echo  '  clean           - Remove most generated files but keep the config and'
1162         @echo  '                    enough build support to build external modules'
1163         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1164         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1165         @echo  ''
1166         @echo  'Configuration targets:'
1167         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1168         @echo  ''
1169         @echo  'Other generic targets:'
1170         @echo  '  all             - Build all targets marked with [*]'
1171         @echo  '* vmlinux         - Build the bare kernel'
1172         @echo  '* modules         - Build all modules'
1173         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1174         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1175         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1176         @echo  '  dir/            - Build all files in dir and below'
1177         @echo  '  dir/file.[oisS] - Build specified target only'
1178         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1179         @echo  '                    (requires a recent binutils and recent build (System.map))'
1180         @echo  '  dir/file.ko     - Build module including final link'
1181         @echo  '  modules_prepare - Set up for building external modules'
1182         @echo  '  tags/TAGS       - Generate tags file for editors'
1183         @echo  '  cscope          - Generate cscope index'
1184         @echo  '  gtags           - Generate GNU GLOBAL index'
1185         @echo  '  kernelrelease   - Output the release version string'
1186         @echo  '  kernelversion   - Output the version stored in Makefile'
1187         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1188          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1189          echo  ''
1190         @echo  'Static analysers'
1191         @echo  '  checkstack      - Generate a list of stack hogs'
1192         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1193         @echo  '  versioncheck    - Sanity check on version.h usage'
1194         @echo  '  includecheck    - Check for duplicate included header files'
1195         @echo  '  export_report   - List the usages of all exported symbols'
1196         @echo  '  headers_check   - Sanity check on exported headers'
1197         @echo  '  headerdep       - Detect inclusion cycles in headers'
1198         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1199         @echo  ''
1200         @echo  'Kernel packaging:'
1201         @$(MAKE) $(build)=$(package-dir) help
1202         @echo  ''
1203         @echo  'Documentation targets:'
1204         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1205         @echo  ''
1206         @echo  'Architecture specific targets ($(SRCARCH)):'
1207         @$(if $(archhelp),$(archhelp),\
1208                 echo '  No architecture specific help defined for $(SRCARCH)')
1209         @echo  ''
1210         @$(if $(boards), \
1211                 $(foreach b, $(boards), \
1212                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1213                 echo '')
1214         @$(if $(board-dirs), \
1215                 $(foreach b, $(board-dirs), \
1216                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1217                 printf "  %-16s - Show all of the above\\n" help-boards; \
1218                 echo '')
1219
1220         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1221         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1222         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1223         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1224         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1225         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1226         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1227         @echo  '                1: warnings which may be relevant and do not occur too often'
1228         @echo  '                2: warnings which occur quite often but may still be relevant'
1229         @echo  '                3: more obscure warnings, can most likely be ignored'
1230         @echo  '                Multiple levels can be combined with W=12 or W=123'
1231         @echo  ''
1232         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1233         @echo  'For further info see the ./README file'
1234
1235
1236 help-board-dirs := $(addprefix help-,$(board-dirs))
1237
1238 help-boards: $(help-board-dirs)
1239
1240 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1241
1242 $(help-board-dirs): help-%:
1243         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1244         @$(if $(boards-per-dir), \
1245                 $(foreach b, $(boards-per-dir), \
1246                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1247                 echo '')
1248
1249
1250 # Documentation targets
1251 # ---------------------------------------------------------------------------
1252 %docs: scripts_basic FORCE
1253         $(Q)$(MAKE) $(build)=scripts build_docproc
1254         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1255
1256 else # KBUILD_EXTMOD
1257
1258 ###
1259 # External module support.
1260 # When building external modules the kernel used as basis is considered
1261 # read-only, and no consistency checks are made and the make
1262 # system is not used on the basis kernel. If updates are required
1263 # in the basis kernel ordinary make commands (without M=...) must
1264 # be used.
1265 #
1266 # The following are the only valid targets when building external
1267 # modules.
1268 # make M=dir clean     Delete all automatically generated files
1269 # make M=dir modules   Make all modules in specified dir
1270 # make M=dir           Same as 'make M=dir modules'
1271 # make M=dir modules_install
1272 #                      Install the modules built in the module directory
1273 #                      Assumes install directory is already created
1274
1275 # We are always building modules
1276 KBUILD_MODULES := 1
1277 PHONY += crmodverdir
1278 crmodverdir:
1279         $(cmd_crmodverdir)
1280
1281 PHONY += $(objtree)/Module.symvers
1282 $(objtree)/Module.symvers:
1283         @test -e $(objtree)/Module.symvers || ( \
1284         echo; \
1285         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1286         echo "           is missing; modules will have no dependencies and modversions."; \
1287         echo )
1288
1289 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1290 PHONY += $(module-dirs) modules
1291 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1292         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1293
1294 modules: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
1295 modules: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
1296 modules: $(module-dirs)
1297         @$(kecho) '  Building modules, stage 2.';
1298         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1299
1300 PHONY += modules_install
1301 modules_install: _emodinst_ _emodinst_post
1302
1303 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1304 PHONY += _emodinst_
1305 _emodinst_:
1306         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1307         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1308
1309 PHONY += _emodinst_post
1310 _emodinst_post: _emodinst_
1311         $(call cmd,depmod)
1312
1313 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1314
1315 PHONY += $(clean-dirs) clean
1316 $(clean-dirs):
1317         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1318
1319 clean:  rm-dirs := $(MODVERDIR)
1320 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1321
1322 help:
1323         @echo  '  Building external modules.'
1324         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1325         @echo  ''
1326         @echo  '  modules         - default target, build the module(s)'
1327         @echo  '  modules_install - install the module'
1328         @echo  '  clean           - remove generated files in module directory only'
1329         @echo  ''
1330
1331 # Dummies...
1332 PHONY += prepare scripts
1333 prepare: ;
1334 scripts: ;
1335 endif # KBUILD_EXTMOD
1336
1337 clean: $(clean-dirs)
1338         $(call cmd,rmdirs)
1339         $(call cmd,rmfiles)
1340         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1341                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1342                 -o -name '*.ko.*' \
1343                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1344                 -o -name '*.symtypes' -o -name 'modules.order' \
1345                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1346                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1347
1348 # Generate tags for editors
1349 # ---------------------------------------------------------------------------
1350 quiet_cmd_tags = GEN     $@
1351       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1352
1353 tags TAGS cscope gtags: FORCE
1354         $(call cmd,tags)
1355
1356 # Scripts to check various things for consistency
1357 # ---------------------------------------------------------------------------
1358
1359 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1360
1361 includecheck:
1362         find $(srctree)/* $(RCS_FIND_IGNORE) \
1363                 -name '*.[hcS]' -type f -print | sort \
1364                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1365
1366 versioncheck:
1367         find $(srctree)/* $(RCS_FIND_IGNORE) \
1368                 -name '*.[hcS]' -type f -print | sort \
1369                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1370
1371 coccicheck:
1372         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1373
1374 namespacecheck:
1375         $(PERL) $(srctree)/scripts/namespace.pl
1376
1377 export_report:
1378         $(PERL) $(srctree)/scripts/export_report.pl
1379
1380 endif #ifeq ($(config-targets),1)
1381 endif #ifeq ($(mixed-targets),1)
1382
1383 PHONY += checkstack kernelrelease kernelversion
1384
1385 # UML needs a little special treatment here.  It wants to use the host
1386 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1387 # else wants $(ARCH), including people doing cross-builds, which means
1388 # that $(SUBARCH) doesn't work here.
1389 ifeq ($(ARCH), um)
1390 CHECKSTACK_ARCH := $(SUBARCH)
1391 else
1392 CHECKSTACK_ARCH := $(ARCH)
1393 endif
1394 checkstack:
1395         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1396         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1397
1398 kernelrelease:
1399         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1400
1401 kernelversion:
1402         @echo $(KERNELVERSION)
1403
1404 # Clear a bunch of variables before executing the submake
1405 tools/: FORCE
1406         $(Q)mkdir -p $(objtree)/tools
1407         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1408
1409 tools/%: FORCE
1410         $(Q)mkdir -p $(objtree)/tools
1411         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1412
1413 # Single targets
1414 # ---------------------------------------------------------------------------
1415 # Single targets are compatible with:
1416 # - build with mixed source and output
1417 # - build with separate output dir 'make O=...'
1418 # - external modules
1419 #
1420 #  target-dir => where to store outputfile
1421 #  build-dir  => directory in kernel source tree to use
1422
1423 ifeq ($(KBUILD_EXTMOD),)
1424         build-dir  = $(patsubst %/,%,$(dir $@))
1425         target-dir = $(dir $@)
1426 else
1427         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1428         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1429         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1430 endif
1431
1432 %.s: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
1433 %.s: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
1434 %.s: %.c gcc-plugins prepare scripts FORCE
1435         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1436 %.i: %.c prepare scripts FORCE
1437         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1438 %.o: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
1439 %.o: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
1440 %.o: %.c gcc-plugins prepare scripts FORCE
1441         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1442 %.lst: %.c prepare scripts FORCE
1443         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1444 %.s: %.S gcc-plugins prepare scripts FORCE
1445         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1446 %.o: %.S gcc-plugins prepare scripts FORCE
1447         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1448 %.symtypes: %.c prepare scripts FORCE
1449         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1450
1451 # Modules
1452 /: prepare scripts FORCE
1453         $(cmd_crmodverdir)
1454         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1455         $(build)=$(build-dir)
1456 %/: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
1457 %/: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
1458 %/: gcc-plugins prepare scripts FORCE
1459         $(cmd_crmodverdir)
1460         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1461         $(build)=$(build-dir)
1462 %.ko: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
1463 %.ko: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
1464 %.ko: gcc-plugins prepare scripts FORCE
1465         $(cmd_crmodverdir)
1466         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1467         $(build)=$(build-dir) $(@:.ko=.o)
1468         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1469
1470 # FIXME Should go into a make.lib or something
1471 # ===========================================================================
1472
1473 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1474       cmd_rmdirs = rm -rf $(rm-dirs)
1475
1476 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1477       cmd_rmfiles = rm -f $(rm-files)
1478
1479 # Run depmod only if we have System.map and depmod is executable
1480 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1481       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1482                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1483
1484 # Create temporary dir for module support files
1485 # clean it up only when building all modules
1486 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1487                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1488
1489 # read all saved command lines
1490
1491 targets := $(wildcard $(sort $(targets)))
1492 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1493
1494 ifneq ($(cmd_files),)
1495   $(cmd_files): ;       # Do not try to update included dependency files
1496   include $(cmd_files)
1497 endif
1498
1499 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1500 # Usage:
1501 # $(Q)$(MAKE) $(clean)=dir
1502 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1503
1504 endif   # skip-makefile
1505
1506 PHONY += FORCE
1507 FORCE:
1508
1509 # Declare the contents of the .PHONY variable as phony.  We keep that
1510 # information in a variable so we can use it in if_changed and friends.
1511 .PHONY: $(PHONY)