Makefile

   1 VERSION = 3
   2 PATCHLEVEL = 4
   3 SUBLEVEL = 0
   4 EXTRAVERSION =
   5 NAME = Saber-toothed Squirrel
   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         $(Q)@:
 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/i386/ -e s/sun4u/sparc64/ \
 169                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                   -e s/sh[234].*/sh/ )
 173
 174 # Cross compiling and selecting different set of gcc/bin-utils
 175 # ---------------------------------------------------------------------------
 176 #
 177 # When performing cross compilation for other architectures ARCH shall be set
 178 # to the target architecture. (See arch/* for the possibilities).
 179 # ARCH can be set during invocation of make:
 180 # make ARCH=ia64
 181 # Another way is to have ARCH set in the environment.
 182 # The default ARCH is the host where make is executed.
 183
 184 # CROSS_COMPILE specify the prefix used for all executables used
 185 # during compilation. Only gcc and related bin-utils executables
 186 # are prefixed with $(CROSS_COMPILE).
 187 # CROSS_COMPILE can be set on the command line
 188 # make CROSS_COMPILE=ia64-linux-
 189 # Alternatively CROSS_COMPILE can be set in the environment.
 190 # A third alternative is to store a setting in .config so that plain
 191 # "make" in the configured kernel build directory always uses that.
 192 # Default value for CROSS_COMPILE is not to prefix executables
 193 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 194 export KBUILD_BUILDHOST := $(SUBARCH)
 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  := $(SRCARCH)
 233
 234 ifeq ($(ARCH),m68knommu)
 235        hdr-arch  := m68k
 236 endif
 237
 238 KCONFIG_CONFIG  ?= .config
 239 export KCONFIG_CONFIG
 240
 241 # SHELL used by kbuild
 242 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 243           else if [ -x /bin/bash ]; then echo /bin/bash; \
 244           else echo sh; fi ; fi)
 245
 246 HOSTCC       = gcc
 247 HOSTCXX      = g++
 248 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 249 HOSTCXXFLAGS = -O2
 250
 251 # Decide whether to build built-in, modular, or both.
 252 # Normally, just do built-in.
 253
 254 KBUILD_MODULES :=
 255 KBUILD_BUILTIN := 1
 256
 257 #       If we have only "make modules", don't compile built-in objects.
 258 #       When we're building modules with modversions, we need to consider
 259 #       the built-in objects during the descend as well, in order to
 260 #       make sure the checksums are up to date before we record them.
 261
 262 ifeq ($(MAKECMDGOALS),modules)
 263   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 264 endif
 265
 266 #       If we have "make <whatever> modules", compile modules
 267 #       in addition to whatever we do anyway.
 268 #       Just "make" or "make all" shall build modules as well
 269
 270 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 271   KBUILD_MODULES := 1
 272 endif
 273
 274 ifeq ($(MAKECMDGOALS),)
 275   KBUILD_MODULES := 1
 276 endif
 277
 278 export KBUILD_MODULES KBUILD_BUILTIN
 279 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 280
 281 # Beautify output
 282 # ---------------------------------------------------------------------------
 283 #
 284 # Normally, we echo the whole command before executing it. By making
 285 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 286 # $(quiet) to choose other forms of output instead, e.g.
 287 #
 288 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 289 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 290 #
 291 # If $(quiet) is empty, the whole command will be printed.
 292 # If it is set to "quiet_", only the short version will be printed.
 293 # If it is set to "silent_", nothing will be printed at all, since
 294 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 295 #
 296 # A simple variant is to prefix commands with $(Q) - that's useful
 297 # for commands that shall be hidden in non-verbose mode.
 298 #
 299 #       $(Q)ln $@ :<
 300 #
 301 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 302 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 303
 304 ifeq ($(KBUILD_VERBOSE),1)
 305   quiet =
 306   Q =
 307 else
 308   quiet=quiet_
 309   Q = @
 310 endif
 311
 312 # If the user is running make -s (silent mode), suppress echoing of
 313 # commands
 314
 315 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 316   quiet=silent_
 317 endif
 318
 319 export quiet Q KBUILD_VERBOSE
 320
 321
 322 # Look for make include files relative to root of kernel src
 323 MAKEFLAGS += --include-dir=$(srctree)
 324
 325 # We need some generic definitions (do not try to remake the file).
 326 $(srctree)/scripts/Kbuild.include: ;
 327 include $(srctree)/scripts/Kbuild.include
 328
 329 # Make variables (CC, etc...)
 330
 331 AS              = $(CROSS_COMPILE)as
 332 LD              = $(CROSS_COMPILE)ld
 333 CC              = $(CROSS_COMPILE)gcc
 334 CPP             = $(CC) -E
 335 AR              = $(CROSS_COMPILE)ar
 336 NM              = $(CROSS_COMPILE)nm
 337 STRIP           = $(CROSS_COMPILE)strip
 338 OBJCOPY         = $(CROSS_COMPILE)objcopy
 339 OBJDUMP         = $(CROSS_COMPILE)objdump
 340 AWK             = awk
 341 GENKSYMS        = scripts/genksyms/genksyms
 342 INSTALLKERNEL  := installkernel
 343 DEPMOD          = /sbin/depmod
 344 KALLSYMS        = scripts/kallsyms
 345 PERL            = perl
 346 CHECK           = sparse
 347
 348 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 349                   -Wbitwise -Wno-return-void $(CF)
 350 CFLAGS_MODULE   =
 351 AFLAGS_MODULE   =
 352 LDFLAGS_MODULE  =
 353 CFLAGS_KERNEL   =
 354 AFLAGS_KERNEL   =
 355 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 356
 357
 358 # Use LINUXINCLUDE when you must reference the include/ directory.
 359 # Needed to be compatible with the O= option
 360 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include \
 361                    -Iarch/$(hdr-arch)/include/generated -Iinclude \
 362                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 363                    -include $(srctree)/include/linux/kconfig.h
 364
 365 KBUILD_CPPFLAGS := -D__KERNEL__
 366
 367 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 368                    -fno-strict-aliasing -fno-common \
 369                    -Werror-implicit-function-declaration \
 370                    -Wno-format-security \
 371                    -fno-delete-null-pointer-checks
 372 KBUILD_AFLAGS_KERNEL :=
 373 KBUILD_CFLAGS_KERNEL :=
 374 KBUILD_AFLAGS   := -D__ASSEMBLY__
 375 KBUILD_AFLAGS_MODULE  := -DMODULE
 376 KBUILD_CFLAGS_MODULE  := -DMODULE
 377 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 378
 379 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 380 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 381 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 382
 383 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 384 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 385 export CPP AR NM STRIP OBJCOPY OBJDUMP
 386 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 387 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 388
 389 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 390 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 391 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 392 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 393 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 394 export KBUILD_ARFLAGS
 395
 396 # When compiling out-of-tree modules, put MODVERDIR in the module
 397 # tree rather than in the kernel tree. The kernel tree might
 398 # even be read-only.
 399 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 400
 401 # Files to ignore in find ... statements
 402
 403 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
 404                    -o -name .pc -o -name .hg -o -name .git \) -prune -o
 405 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 406                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 407
 408 # ===========================================================================
 409 # Rules shared between *config targets and build targets
 410
 411 # Basic helpers built in scripts/
 412 PHONY += scripts_basic
 413 scripts_basic:
 414         $(Q)$(MAKE) $(build)=scripts/basic
 415         $(Q)rm -f .tmp_quiet_recordmcount
 416
 417 # To avoid any implicit rule to kick in, define an empty command.
 418 scripts/basic/%: scripts_basic ;
 419
 420 PHONY += outputmakefile
 421 # outputmakefile generates a Makefile in the output directory, if using a
 422 # separate output directory. This allows convenient use of make in the
 423 # output directory.
 424 outputmakefile:
 425 ifneq ($(KBUILD_SRC),)
 426         $(Q)ln -fsn $(srctree) source
 427         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 428             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 429 endif
 430
 431 # Support for using generic headers in asm-generic
 432 PHONY += asm-generic
 433 asm-generic:
 434         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 435                     obj=arch/$(SRCARCH)/include/generated/asm
 436
 437 # To make sure we do not include .config for any of the *config targets
 438 # catch them early, and hand them over to scripts/kconfig/Makefile
 439 # It is allowed to specify more targets when calling make, including
 440 # mixing *config targets and build targets.
 441 # For example 'make oldconfig all'.
 442 # Detect when mixed targets is specified, and make a second invocation
 443 # of make so .config is not included in this case either (for *config).
 444
 445 no-dot-config-targets := clean mrproper distclean \
 446                          cscope gtags TAGS tags help %docs check% coccicheck \
 447                          include/linux/version.h headers_% archheaders archscripts \
 448                          kernelversion %src-pkg
 449
 450 config-targets := 0
 451 mixed-targets  := 0
 452 dot-config     := 1
 453
 454 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 455         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 456                 dot-config := 0
 457         endif
 458 endif
 459
 460 ifeq ($(KBUILD_EXTMOD),)
 461         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 462                 config-targets := 1
 463                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 464                         mixed-targets := 1
 465                 endif
 466         endif
 467 endif
 468
 469 ifeq ($(mixed-targets),1)
 470 # ===========================================================================
 471 # We're called with mixed targets (*config and build targets).
 472 # Handle them one by one.
 473
 474 %:: FORCE
 475         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 476
 477 else
 478 ifeq ($(config-targets),1)
 479 # ===========================================================================
 480 # *config targets only - make sure prerequisites are updated, and descend
 481 # in scripts/kconfig to make the *config target
 482
 483 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 484 # KBUILD_DEFCONFIG may point out an alternative default configuration
 485 # used for 'make defconfig'
 486 include $(srctree)/arch/$(SRCARCH)/Makefile
 487 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 488
 489 config: scripts_basic outputmakefile FORCE
 490         $(Q)mkdir -p include/linux include/config
 491         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 492
 493 %config: scripts_basic outputmakefile FORCE
 494         $(Q)mkdir -p include/linux include/config
 495         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 496
 497 else
 498 # ===========================================================================
 499 # Build targets only - this includes vmlinux, arch specific targets, clean
 500 # targets and others. In general all targets except *config targets.
 501
 502 ifeq ($(KBUILD_EXTMOD),)
 503 # Additional helpers built in scripts/
 504 # Carefully list dependencies so we do not try to build scripts twice
 505 # in parallel
 506 PHONY += scripts
 507 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 508         $(Q)$(MAKE) $(build)=$(@)
 509
 510 # Objects we will link into vmlinux / subdirs we need to visit
 511 init-y          := init/
 512 drivers-y       := drivers/ sound/ firmware/
 513 net-y           := net/
 514 libs-y          := lib/
 515 core-y          := usr/
 516 endif # KBUILD_EXTMOD
 517
 518 ifeq ($(dot-config),1)
 519 # Read in config
 520 -include include/config/auto.conf
 521
 522 ifeq ($(KBUILD_EXTMOD),)
 523 # Read in dependencies to all Kconfig* files, make sure to run
 524 # oldconfig if changes are detected.
 525 -include include/config/auto.conf.cmd
 526
 527 # To avoid any implicit rule to kick in, define an empty command
 528 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 529
 530 # If .config is newer than include/config/auto.conf, someone tinkered
 531 # with it and forgot to run make oldconfig.
 532 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 533 # we execute the config step to be sure to catch updated Kconfig files
 534 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 535         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 536 else
 537 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 538 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 539 PHONY += include/config/auto.conf
 540
 541 include/config/auto.conf:
 542         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 543         echo;                                                           \
 544         echo "  ERROR: Kernel configuration is invalid.";               \
 545         echo "         include/generated/autoconf.h or $@ are missing.";\
 546         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 547         echo;                                                           \
 548         /bin/false)
 549
 550 endif # KBUILD_EXTMOD
 551
 552 else
 553 # Dummy target needed, because used as prerequisite
 554 include/config/auto.conf: ;
 555 endif # $(dot-config)
 556
 557 # The all: target is the default when no target is given on the
 558 # command line.
 559 # This allow a user to issue only 'make' to build a kernel including modules
 560 # Defaults to vmlinux, but the arch makefile usually adds further targets
 561 all: vmlinux
 562
 563 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 564 KBUILD_CFLAGS   += -Os
 565 else
 566 KBUILD_CFLAGS   += -O2
 567 endif
 568
 569 ifdef CONFIG_READABLE_ASM
 570 # Disable optimizations that make assembler listings hard to read.
 571 # reorder blocks reorders the control in the function
 572 # ipa clone creates specialized cloned functions
 573 # partial inlining inlines only parts of functions
 574 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 575                  $(call cc-option,-fno-ipa-cp-clone,) \
 576                  $(call cc-option,-fno-partial-inlining)
 577 endif
 578
 579 include $(srctree)/arch/$(SRCARCH)/Makefile
 580
 581 ifneq ($(CONFIG_FRAME_WARN),0)
 582 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 583 endif
 584
 585 # Force gcc to behave correct even for buggy distributions
 586 ifndef CONFIG_CC_STACKPROTECTOR
 587 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 588 endif
 589
 590 # This warning generated too much noise in a regular build.
 591 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 592 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 593
 594 ifdef CONFIG_FRAME_POINTER
 595 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 596 else
 597 # Some targets (ARM with Thumb2, for example), can't be built with frame
 598 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 599 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 600 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 601 # -fomit-frame-pointer with FUNCTION_TRACER.
 602 ifndef CONFIG_FUNCTION_TRACER
 603 KBUILD_CFLAGS   += -fomit-frame-pointer
 604 endif
 605 endif
 606
 607 ifdef CONFIG_DEBUG_INFO
 608 KBUILD_CFLAGS   += -g
 609 KBUILD_AFLAGS   += -gdwarf-2
 610 endif
 611
 612 ifdef CONFIG_DEBUG_INFO_REDUCED
 613 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 614 endif
 615
 616 ifdef CONFIG_FUNCTION_TRACER
 617 KBUILD_CFLAGS   += -pg
 618 ifdef CONFIG_DYNAMIC_FTRACE
 619         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 620                 BUILD_C_RECORDMCOUNT := y
 621                 export BUILD_C_RECORDMCOUNT
 622         endif
 623 endif
 624 endif
 625
 626 # We trigger additional mismatches with less inlining
 627 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 628 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 629 endif
 630
 631 # arch Makefile may override CC so keep this after arch Makefile is included
 632 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 633 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 634
 635 # warn about C99 declaration after statement
 636 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 637
 638 # disable pointer signed / unsigned warnings in gcc 4.0
 639 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 640
 641 # disable invalid "can't wrap" optimizations for signed / pointers
 642 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 643
 644 # conserve stack if available
 645 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 646
 647 # use the deterministic mode of AR if available
 648 KBUILD_ARFLAGS := $(call ar-option,D)
 649
 650 # check for 'asm goto'
 651 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 652         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 653 endif
 654
 655 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 656 # But warn user when we do so
 657 warn-assign = \
 658 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 659
 660 ifneq ($(KCPPFLAGS),)
 661         $(call warn-assign,CPPFLAGS)
 662         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 663 endif
 664 ifneq ($(KAFLAGS),)
 665         $(call warn-assign,AFLAGS)
 666         KBUILD_AFLAGS += $(KAFLAGS)
 667 endif
 668 ifneq ($(KCFLAGS),)
 669         $(call warn-assign,CFLAGS)
 670         KBUILD_CFLAGS += $(KCFLAGS)
 671 endif
 672
 673 # Use --build-id when available.
 674 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 675                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 676 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 677 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 678
 679 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 680 LDFLAGS_vmlinux += $(call ld-option, -X,)
 681 endif
 682
 683 # Default kernel image to build when no specific target is given.
 684 # KBUILD_IMAGE may be overruled on the command line or
 685 # set in the environment
 686 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 687 # this default value
 688 export KBUILD_IMAGE ?= vmlinux
 689
 690 #
 691 # INSTALL_PATH specifies where to place the updated kernel and system map
 692 # images. Default is /boot, but you can set it to other values
 693 export  INSTALL_PATH ?= /boot
 694
 695 #
 696 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 697 # relocations required by build roots.  This is not defined in the
 698 # makefile but the argument can be passed to make if needed.
 699 #
 700
 701 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 702 export MODLIB
 703
 704 #
 705 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 706 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 707 #  the default option --strip-debug will be used.  Otherwise,
 708 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 709
 710 ifdef INSTALL_MOD_STRIP
 711 ifeq ($(INSTALL_MOD_STRIP),1)
 712 mod_strip_cmd = $(STRIP) --strip-debug
 713 else
 714 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 715 endif # INSTALL_MOD_STRIP=1
 716 else
 717 mod_strip_cmd = true
 718 endif # INSTALL_MOD_STRIP
 719 export mod_strip_cmd
 720
 721
 722 ifeq ($(KBUILD_EXTMOD),)
 723 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 724
 725 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 726                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 727                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 728
 729 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 730                      $(init-n) $(init-) \
 731                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 732                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 733
 734 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 735 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 736 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 737 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 738 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 739 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 740 libs-y          := $(libs-y1) $(libs-y2)
 741
 742 # Build vmlinux
 743 # ---------------------------------------------------------------------------
 744 # vmlinux is built from the objects selected by $(vmlinux-init) and
 745 # $(vmlinux-main). Most are built-in.o files from top-level directories
 746 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 747 # Ordering when linking is important, and $(vmlinux-init) must be first.
 748 #
 749 # vmlinux
 750 #   ^
 751 #   |
 752 #   +-< $(vmlinux-init)
 753 #   |   +--< init/version.o + more
 754 #   |
 755 #   +--< $(vmlinux-main)
 756 #   |    +--< driver/built-in.o mm/built-in.o + more
 757 #   |
 758 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 759 #
 760 # vmlinux version (uname -v) cannot be updated during normal
 761 # descending-into-subdirs phase since we do not yet know if we need to
 762 # update vmlinux.
 763 # Therefore this step is delayed until just before final link of vmlinux -
 764 # except in the kallsyms case where it is done just before adding the
 765 # symbols to the kernel.
 766 #
 767 # System.map is generated to document addresses of all kernel symbols
 768
 769 vmlinux-init := $(head-y) $(init-y)
 770 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 771 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 772 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 773 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 774
 775 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 776 # May be overridden by arch/$(ARCH)/Makefile
 777 quiet_cmd_vmlinux__ ?= LD      $@
 778       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 779       -T $(vmlinux-lds) $(vmlinux-init)                          \
 780       --start-group $(vmlinux-main) --end-group                  \
 781       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 782
 783 # Generate new vmlinux version
 784 quiet_cmd_vmlinux_version = GEN     .version
 785       cmd_vmlinux_version = set -e;                     \
 786         if [ ! -r .version ]; then                      \
 787           rm -f .version;                               \
 788           echo 1 >.version;                             \
 789         else                                            \
 790           mv .version .old_version;                     \
 791           expr 0$$(cat .old_version) + 1 >.version;     \
 792         fi;                                             \
 793         $(MAKE) $(build)=init
 794
 795 # Generate System.map
 796 quiet_cmd_sysmap = SYSMAP
 797       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 798
 799 # Sort exception table at build time
 800 quiet_cmd_sortextable = SORTEX
 801       cmd_sortextable = $(objtree)/scripts/sortextable
 802
 803 # Link of vmlinux
 804 # If CONFIG_KALLSYMS is set .version is already updated
 805 # Generate System.map and verify that the content is consistent
 806 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 807 # First command is ':' to allow us to use + in front of the rule
 808 define rule_vmlinux__
 809         :
 810         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 811
 812         $(call cmd,vmlinux__)
 813         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 814
 815         $(if $(CONFIG_BUILDTIME_EXTABLE_SORT),                          \
 816           $(Q)$(if $($(quiet)cmd_sortextable),                          \
 817             echo '  $($(quiet)cmd_sortextable)  vmlinux' &&)            \
 818           $(cmd_sortextable)  vmlinux)
 819
 820
 821         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 822           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 823         $(cmd_sysmap) $@ System.map;                                         \
 824         if [ $$? -ne 0 ]; then                                               \
 825                 rm -f $@;                                                    \
 826                 /bin/false;                                                  \
 827         fi;
 828         $(verify_kallsyms)
 829 endef
 830
 831
 832 ifdef CONFIG_KALLSYMS
 833 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 834 # It's a three stage process:
 835 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 836 #   empty
 837 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 838 #   the right size - vmlinux version (uname -v) is updated during this step
 839 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 840 #   but due to the added section, some addresses have shifted.
 841 #   From here, we generate a correct .tmp_kallsyms2.o
 842 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 843 # o Verify that the System.map from vmlinux matches the map from
 844 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 845 # o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
 846 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 847 #   temporary bypass to allow the kernel to be built while the
 848 #   maintainers work out what went wrong with kallsyms.
 849
 850 last_kallsyms := 2
 851
 852 ifdef KALLSYMS_EXTRA_PASS
 853 ifneq ($(KALLSYMS_EXTRA_PASS),0)
 854 last_kallsyms := 3
 855 endif
 856 endif
 857
 858 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 859
 860 define verify_kallsyms
 861         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 862           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 863           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 864         $(Q)cmp -s System.map .tmp_System.map ||                             \
 865                 (echo Inconsistent kallsyms data;                            \
 866                  echo This is a bug - please report about it;                \
 867                  echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround;      \
 868                  rm .tmp_kallsyms* ; /bin/false )
 869 endef
 870
 871 # Update vmlinux version before link
 872 # Use + in front of this rule to silent warning about make -j1
 873 # First command is ':' to allow us to use + in front of this rule
 874 cmd_ksym_ld = $(cmd_vmlinux__)
 875 define rule_ksym_ld
 876         :
 877         +$(call cmd,vmlinux_version)
 878         $(call cmd,vmlinux__)
 879         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 880 endef
 881
 882 # Generate .S file with all kernel symbols
 883 quiet_cmd_kallsyms = KSYM    $@
 884       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 885                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 886
 887 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 888         $(call if_changed_dep,as_o_S)
 889
 890 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 891         $(call cmd,kallsyms)
 892
 893 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 894 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 895         $(call if_changed_rule,ksym_ld)
 896
 897 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 898         $(call if_changed,vmlinux__)
 899
 900 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 901         $(call if_changed,vmlinux__)
 902
 903 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 904 $(KALLSYMS): scripts ;
 905
 906 # Generate some data for debugging strange kallsyms problems
 907 debug_kallsyms: .tmp_map$(last_kallsyms)
 908
 909 .tmp_map%: .tmp_vmlinux% FORCE
 910         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 911
 912 .tmp_map3: .tmp_map2
 913
 914 .tmp_map2: .tmp_map1
 915
 916 endif # ifdef CONFIG_KALLSYMS
 917
 918 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 919 # relevant sections renamed as per the linker script.
 920 quiet_cmd_vmlinux-modpost = LD      $@
 921       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 922          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 923          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 924 define rule_vmlinux-modpost
 925         :
 926         +$(call cmd,vmlinux-modpost)
 927         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 928         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 929 endef
 930
 931 # vmlinux image - including updated kernel symbols
 932 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 933 ifdef CONFIG_HEADERS_CHECK
 934         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 935 endif
 936 ifdef CONFIG_SAMPLES
 937         $(Q)$(MAKE) $(build)=samples
 938 endif
 939 ifdef CONFIG_BUILD_DOCSRC
 940         $(Q)$(MAKE) $(build)=Documentation
 941 endif
 942         $(call vmlinux-modpost)
 943         $(call if_changed_rule,vmlinux__)
 944         $(Q)rm -f .old_version
 945
 946 # build vmlinux.o first to catch section mismatch errors early
 947 ifdef CONFIG_KALLSYMS
 948 .tmp_vmlinux1: vmlinux.o
 949 endif
 950
 951 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 952 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 953         $(call if_changed_rule,vmlinux-modpost)
 954
 955 # The actual objects are generated when descending,
 956 # make sure no implicit rule kicks in
 957 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 958
 959 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 960 # Preset locale variables to speed up the build process. Limit locale
 961 # tweaks to this spot to avoid wrong language settings when running
 962 # make menuconfig etc.
 963 # Error messages still appears in the original language
 964
 965 PHONY += $(vmlinux-dirs)
 966 $(vmlinux-dirs): prepare scripts
 967         $(Q)$(MAKE) $(build)=$@
 968
 969 # Store (new) KERNELRELASE string in include/config/kernel.release
 970 include/config/kernel.release: include/config/auto.conf FORCE
 971         $(Q)rm -f $@
 972         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 973
 974
 975 # Things we need to do before we recursively start building the kernel
 976 # or the modules are listed in "prepare".
 977 # A multi level approach is used. prepareN is processed before prepareN-1.
 978 # archprepare is used in arch Makefiles and when processed asm symlink,
 979 # version.h and scripts_basic is processed / created.
 980
 981 # Listed in dependency order
 982 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 983
 984 # prepare3 is used to check if we are building in a separate output directory,
 985 # and if so do:
 986 # 1) Check that make has not been executed in the kernel src $(srctree)
 987 prepare3: include/config/kernel.release
 988 ifneq ($(KBUILD_SRC),)
 989         @$(kecho) '  Using $(srctree) as source for kernel'
 990         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 991                 echo "  $(srctree) is not clean, please run 'make mrproper'"; \
 992                 echo "  in the '$(srctree)' directory.";\
 993                 /bin/false; \
 994         fi;
 995 endif
 996
 997 # prepare2 creates a makefile if using a separate output directory
 998 prepare2: prepare3 outputmakefile asm-generic
 999
1000 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
1001                    include/config/auto.conf
1002         $(cmd_crmodverdir)
1003
1004 archprepare: archheaders archscripts prepare1 scripts_basic
1005
1006 prepare0: archprepare FORCE
1007         $(Q)$(MAKE) $(build)=.
1008
1009 # All the preparing..
1010 prepare: prepare0
1011
1012 # Generate some files
1013 # ---------------------------------------------------------------------------
1014
1015 # KERNELRELEASE can change from a few different places, meaning version.h
1016 # needs to be updated, so this check is forced on all builds
1017
1018 uts_len := 64
1019 define filechk_utsrelease.h
1020         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1021           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1022           exit 1;                                                         \
1023         fi;                                                               \
1024         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1025 endef
1026
1027 define filechk_version.h
1028         (echo \#define LINUX_VERSION_CODE $(shell                         \
1029         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1030         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1031 endef
1032
1033 include/linux/version.h: $(srctree)/Makefile FORCE
1034         $(call filechk,version.h)
1035
1036 include/generated/utsrelease.h: include/config/kernel.release FORCE
1037         $(call filechk,utsrelease.h)
1038
1039 PHONY += headerdep
1040 headerdep:
1041         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1042         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1043
1044 # ---------------------------------------------------------------------------
1045
1046 PHONY += depend dep
1047 depend dep:
1048         @echo '*** Warning: make $@ is unnecessary now.'
1049
1050 # ---------------------------------------------------------------------------
1051 # Firmware install
1052 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1053 export INSTALL_FW_PATH
1054
1055 PHONY += firmware_install
1056 firmware_install: FORCE
1057         @mkdir -p $(objtree)/firmware
1058         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1059
1060 # ---------------------------------------------------------------------------
1061 # Kernel headers
1062
1063 #Default location for installed headers
1064 export INSTALL_HDR_PATH = $(objtree)/usr
1065
1066 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1067
1068 # If we do an all arch process set dst to asm-$(hdr-arch)
1069 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1070
1071 PHONY += archheaders
1072 archheaders:
1073
1074 PHONY += archscripts
1075 archscripts:
1076
1077 PHONY += __headers
1078 __headers: include/linux/version.h scripts_basic asm-generic archheaders archscripts FORCE
1079         $(Q)$(MAKE) $(build)=scripts build_unifdef
1080
1081 PHONY += headers_install_all
1082 headers_install_all:
1083         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1084
1085 PHONY += headers_install
1086 headers_install: __headers
1087         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1088         $(error Headers not exportable for the $(SRCARCH) architecture))
1089         $(Q)$(MAKE) $(hdr-inst)=include
1090         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1091
1092 PHONY += headers_check_all
1093 headers_check_all: headers_install_all
1094         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1095
1096 PHONY += headers_check
1097 headers_check: headers_install
1098         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1099         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1100
1101 # ---------------------------------------------------------------------------
1102 # Modules
1103
1104 ifdef CONFIG_MODULES
1105
1106 # By default, build modules as well
1107
1108 all: modules
1109
1110 #       Build modules
1111 #
1112 #       A module can be listed more than once in obj-m resulting in
1113 #       duplicate lines in modules.order files.  Those are removed
1114 #       using awk while concatenating to the final file.
1115
1116 PHONY += modules
1117 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1118         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1119         @$(kecho) '  Building modules, stage 2.';
1120         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1121         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1122
1123 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1124         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1125
1126 %/modules.builtin: include/config/auto.conf
1127         $(Q)$(MAKE) $(modbuiltin)=$*
1128
1129
1130 # Target to prepare building external modules
1131 PHONY += modules_prepare
1132 modules_prepare: prepare scripts
1133
1134 # Target to install modules
1135 PHONY += modules_install
1136 modules_install: _modinst_ _modinst_post
1137
1138 PHONY += _modinst_
1139 _modinst_:
1140         @rm -rf $(MODLIB)/kernel
1141         @rm -f $(MODLIB)/source
1142         @mkdir -p $(MODLIB)/kernel
1143         @ln -s $(srctree) $(MODLIB)/source
1144         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1145                 rm -f $(MODLIB)/build ; \
1146                 ln -s $(objtree) $(MODLIB)/build ; \
1147         fi
1148         @cp -f $(objtree)/modules.order $(MODLIB)/
1149         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1150         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1151
1152 # This depmod is only for convenience to give the initial
1153 # boot a modules.dep even before / is mounted read-write.  However the
1154 # boot script depmod is the master version.
1155 PHONY += _modinst_post
1156 _modinst_post: _modinst_
1157         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1158         $(call cmd,depmod)
1159
1160 else # CONFIG_MODULES
1161
1162 # Modules not configured
1163 # ---------------------------------------------------------------------------
1164
1165 modules modules_install: FORCE
1166         @echo
1167         @echo "The present kernel configuration has modules disabled."
1168         @echo "Type 'make config' and enable loadable module support."
1169         @echo "Then build a kernel with module support enabled."
1170         @echo
1171         @exit 1
1172
1173 endif # CONFIG_MODULES
1174
1175 ###
1176 # Cleaning is done on three levels.
1177 # make clean     Delete most generated files
1178 #                Leave enough to build external modules
1179 # make mrproper  Delete the current configuration, and all generated files
1180 # make distclean Remove editor backup files, patch leftover files and the like
1181
1182 # Directories & files removed with 'make clean'
1183 CLEAN_DIRS  += $(MODVERDIR)
1184 CLEAN_FILES +=  vmlinux System.map \
1185                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1186
1187 # Directories & files removed with 'make mrproper'
1188 MRPROPER_DIRS  += include/config usr/include include/generated          \
1189                   arch/*/include/generated
1190 MRPROPER_FILES += .config .config.old .version .old_version             \
1191                   include/linux/version.h                               \
1192                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1193
1194 # clean - Delete most, but leave enough to build external modules
1195 #
1196 clean: rm-dirs  := $(CLEAN_DIRS)
1197 clean: rm-files := $(CLEAN_FILES)
1198 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1199
1200 PHONY += $(clean-dirs) clean archclean
1201 $(clean-dirs):
1202         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1203
1204 clean: archclean
1205
1206 # mrproper - Delete all generated files, including .config
1207 #
1208 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1209 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1210 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1211
1212 PHONY += $(mrproper-dirs) mrproper archmrproper
1213 $(mrproper-dirs):
1214         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1215
1216 mrproper: clean archmrproper $(mrproper-dirs)
1217         $(call cmd,rmdirs)
1218         $(call cmd,rmfiles)
1219
1220 # distclean
1221 #
1222 PHONY += distclean
1223
1224 distclean: mrproper
1225         @find $(srctree) $(RCS_FIND_IGNORE) \
1226                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1227                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1228                 -o -name '.*.rej' \
1229                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1230                 -type f -print | xargs rm -f
1231
1232
1233 # Packaging of the kernel to various formats
1234 # ---------------------------------------------------------------------------
1235 # rpm target kept for backward compatibility
1236 package-dir     := $(srctree)/scripts/package
1237
1238 %src-pkg: FORCE
1239         $(Q)$(MAKE) $(build)=$(package-dir) $@
1240 %pkg: include/config/kernel.release FORCE
1241         $(Q)$(MAKE) $(build)=$(package-dir) $@
1242 rpm: include/config/kernel.release FORCE
1243         $(Q)$(MAKE) $(build)=$(package-dir) $@
1244
1245
1246 # Brief documentation of the typical targets used
1247 # ---------------------------------------------------------------------------
1248
1249 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1250 boards := $(notdir $(boards))
1251 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1252 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1253
1254 help:
1255         @echo  'Cleaning targets:'
1256         @echo  '  clean           - Remove most generated files but keep the config and'
1257         @echo  '                    enough build support to build external modules'
1258         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1259         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1260         @echo  ''
1261         @echo  'Configuration targets:'
1262         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1263         @echo  ''
1264         @echo  'Other generic targets:'
1265         @echo  '  all             - Build all targets marked with [*]'
1266         @echo  '* vmlinux         - Build the bare kernel'
1267         @echo  '* modules         - Build all modules'
1268         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1269         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1270         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1271         @echo  '  dir/            - Build all files in dir and below'
1272         @echo  '  dir/file.[oisS] - Build specified target only'
1273         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1274         @echo  '                    (requires a recent binutils and recent build (System.map))'
1275         @echo  '  dir/file.ko     - Build module including final link'
1276         @echo  '  modules_prepare - Set up for building external modules'
1277         @echo  '  tags/TAGS       - Generate tags file for editors'
1278         @echo  '  cscope          - Generate cscope index'
1279         @echo  '  gtags           - Generate GNU GLOBAL index'
1280         @echo  '  kernelrelease   - Output the release version string'
1281         @echo  '  kernelversion   - Output the version stored in Makefile'
1282         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1283          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1284          echo  ''
1285         @echo  'Static analysers'
1286         @echo  '  checkstack      - Generate a list of stack hogs'
1287         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1288         @echo  '  versioncheck    - Sanity check on version.h usage'
1289         @echo  '  includecheck    - Check for duplicate included header files'
1290         @echo  '  export_report   - List the usages of all exported symbols'
1291         @echo  '  headers_check   - Sanity check on exported headers'
1292         @echo  '  headerdep       - Detect inclusion cycles in headers'
1293         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1294         @echo  ''
1295         @echo  'Kernel packaging:'
1296         @$(MAKE) $(build)=$(package-dir) help
1297         @echo  ''
1298         @echo  'Documentation targets:'
1299         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1300         @echo  ''
1301         @echo  'Architecture specific targets ($(SRCARCH)):'
1302         @$(if $(archhelp),$(archhelp),\
1303                 echo '  No architecture specific help defined for $(SRCARCH)')
1304         @echo  ''
1305         @$(if $(boards), \
1306                 $(foreach b, $(boards), \
1307                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1308                 echo '')
1309         @$(if $(board-dirs), \
1310                 $(foreach b, $(board-dirs), \
1311                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1312                 printf "  %-16s - Show all of the above\\n" help-boards; \
1313                 echo '')
1314
1315         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1316         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1317         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1318         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1319         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1320         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1321         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1322         @echo  '                1: warnings which may be relevant and do not occur too often'
1323         @echo  '                2: warnings which occur quite often but may still be relevant'
1324         @echo  '                3: more obscure warnings, can most likely be ignored'
1325         @echo  '                Multiple levels can be combined with W=12 or W=123'
1326         @echo  ''
1327         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1328         @echo  'For further info see the ./README file'
1329
1330
1331 help-board-dirs := $(addprefix help-,$(board-dirs))
1332
1333 help-boards: $(help-board-dirs)
1334
1335 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1336
1337 $(help-board-dirs): help-%:
1338         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1339         @$(if $(boards-per-dir), \
1340                 $(foreach b, $(boards-per-dir), \
1341                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1342                 echo '')
1343
1344
1345 # Documentation targets
1346 # ---------------------------------------------------------------------------
1347 %docs: scripts_basic FORCE
1348         $(Q)$(MAKE) $(build)=scripts build_docproc
1349         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1350
1351 else # KBUILD_EXTMOD
1352
1353 ###
1354 # External module support.
1355 # When building external modules the kernel used as basis is considered
1356 # read-only, and no consistency checks are made and the make
1357 # system is not used on the basis kernel. If updates are required
1358 # in the basis kernel ordinary make commands (without M=...) must
1359 # be used.
1360 #
1361 # The following are the only valid targets when building external
1362 # modules.
1363 # make M=dir clean     Delete all automatically generated files
1364 # make M=dir modules   Make all modules in specified dir
1365 # make M=dir           Same as 'make M=dir modules'
1366 # make M=dir modules_install
1367 #                      Install the modules built in the module directory
1368 #                      Assumes install directory is already created
1369
1370 # We are always building modules
1371 KBUILD_MODULES := 1
1372 PHONY += crmodverdir
1373 crmodverdir:
1374         $(cmd_crmodverdir)
1375
1376 PHONY += $(objtree)/Module.symvers
1377 $(objtree)/Module.symvers:
1378         @test -e $(objtree)/Module.symvers || ( \
1379         echo; \
1380         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1381         echo "           is missing; modules will have no dependencies and modversions."; \
1382         echo )
1383
1384 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1385 PHONY += $(module-dirs) modules
1386 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1387         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1388
1389 modules: $(module-dirs)
1390         @$(kecho) '  Building modules, stage 2.';
1391         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1392
1393 PHONY += modules_install
1394 modules_install: _emodinst_ _emodinst_post
1395
1396 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1397 PHONY += _emodinst_
1398 _emodinst_:
1399         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1400         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1401
1402 PHONY += _emodinst_post
1403 _emodinst_post: _emodinst_
1404         $(call cmd,depmod)
1405
1406 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1407
1408 PHONY += $(clean-dirs) clean
1409 $(clean-dirs):
1410         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1411
1412 clean:  rm-dirs := $(MODVERDIR)
1413 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1414
1415 help:
1416         @echo  '  Building external modules.'
1417         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1418         @echo  ''
1419         @echo  '  modules         - default target, build the module(s)'
1420         @echo  '  modules_install - install the module'
1421         @echo  '  clean           - remove generated files in module directory only'
1422         @echo  ''
1423
1424 # Dummies...
1425 PHONY += prepare scripts
1426 prepare: ;
1427 scripts: ;
1428 endif # KBUILD_EXTMOD
1429
1430 clean: $(clean-dirs)
1431         $(call cmd,rmdirs)
1432         $(call cmd,rmfiles)
1433         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1434                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1435                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1436                 -o -name '*.symtypes' -o -name 'modules.order' \
1437                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1438                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1439
1440 # Generate tags for editors
1441 # ---------------------------------------------------------------------------
1442 quiet_cmd_tags = GEN     $@
1443       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1444
1445 tags TAGS cscope gtags: FORCE
1446         $(call cmd,tags)
1447
1448 # Scripts to check various things for consistency
1449 # ---------------------------------------------------------------------------
1450
1451 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1452
1453 includecheck:
1454         find $(srctree)/* $(RCS_FIND_IGNORE) \
1455                 -name '*.[hcS]' -type f -print | sort \
1456                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1457
1458 versioncheck:
1459         find $(srctree)/* $(RCS_FIND_IGNORE) \
1460                 -name '*.[hcS]' -type f -print | sort \
1461                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1462
1463 coccicheck:
1464         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1465
1466 namespacecheck:
1467         $(PERL) $(srctree)/scripts/namespace.pl
1468
1469 export_report:
1470         $(PERL) $(srctree)/scripts/export_report.pl
1471
1472 endif #ifeq ($(config-targets),1)
1473 endif #ifeq ($(mixed-targets),1)
1474
1475 PHONY += checkstack kernelrelease kernelversion
1476
1477 # UML needs a little special treatment here.  It wants to use the host
1478 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1479 # else wants $(ARCH), including people doing cross-builds, which means
1480 # that $(SUBARCH) doesn't work here.
1481 ifeq ($(ARCH), um)
1482 CHECKSTACK_ARCH := $(SUBARCH)
1483 else
1484 CHECKSTACK_ARCH := $(ARCH)
1485 endif
1486 checkstack:
1487         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1488         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1489
1490 kernelrelease:
1491         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1492
1493 kernelversion:
1494         @echo $(KERNELVERSION)
1495
1496 # Clear a bunch of variables before executing the submake
1497 tools/: FORCE
1498         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/
1499
1500 tools/%: FORCE
1501         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ $*
1502
1503 # Single targets
1504 # ---------------------------------------------------------------------------
1505 # Single targets are compatible with:
1506 # - build with mixed source and output
1507 # - build with separate output dir 'make O=...'
1508 # - external modules
1509 #
1510 #  target-dir => where to store outputfile
1511 #  build-dir  => directory in kernel source tree to use
1512
1513 ifeq ($(KBUILD_EXTMOD),)
1514         build-dir  = $(patsubst %/,%,$(dir $@))
1515         target-dir = $(dir $@)
1516 else
1517         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1518         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1519         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1520 endif
1521
1522 %.s: %.c prepare scripts FORCE
1523         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524 %.i: %.c prepare scripts FORCE
1525         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526 %.o: %.c prepare scripts FORCE
1527         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528 %.lst: %.c prepare scripts FORCE
1529         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530 %.s: %.S prepare scripts FORCE
1531         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1532 %.o: %.S prepare scripts FORCE
1533         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1534 %.symtypes: %.c prepare scripts FORCE
1535         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1536
1537 # Modules
1538 /: prepare scripts FORCE
1539         $(cmd_crmodverdir)
1540         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1541         $(build)=$(build-dir)
1542 %/: prepare scripts FORCE
1543         $(cmd_crmodverdir)
1544         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1545         $(build)=$(build-dir)
1546 %.ko: prepare scripts FORCE
1547         $(cmd_crmodverdir)
1548         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1549         $(build)=$(build-dir) $(@:.ko=.o)
1550         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1551
1552 # FIXME Should go into a make.lib or something
1553 # ===========================================================================
1554
1555 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1556       cmd_rmdirs = rm -rf $(rm-dirs)
1557
1558 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1559       cmd_rmfiles = rm -f $(rm-files)
1560
1561 # Run depmod only if we have System.map and depmod is executable
1562 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1563       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1564                    $(KERNELRELEASE)
1565
1566 # Create temporary dir for module support files
1567 # clean it up only when building all modules
1568 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1569                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1570
1571 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1572           $(KBUILD_AFLAGS_KERNEL)                              \
1573           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1574           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1575
1576 quiet_cmd_as_o_S = AS      $@
1577 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1578
1579 # read all saved command lines
1580
1581 targets := $(wildcard $(sort $(targets)))
1582 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1583
1584 ifneq ($(cmd_files),)
1585   $(cmd_files): ;       # Do not try to update included dependency files
1586   include $(cmd_files)
1587 endif
1588
1589 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1590 # Usage:
1591 # $(Q)$(MAKE) $(clean)=dir
1592 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1593
1594 endif   # skip-makefile
1595
1596 PHONY += FORCE
1597 FORCE:
1598
1599 # Declare the contents of the .PHONY variable as phony.  We keep that
1600 # information in a variable so we can use it in if_changed and friends.
1601 .PHONY: $(PHONY)