Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 30
   4 EXTRAVERSION = -rc4
   5 NAME = Vindictive Armadillo
   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 # We are using a recursive build, so we need to do a little thinking
  20 # to get the ordering right.
  21 #
  22 # Most importantly: sub-Makefiles should only ever modify files in
  23 # their own directory. If in some directory we have a dependency on
  24 # a file in another dir (which doesn't happen often, but it's often
  25 # unavoidable when linking the built-in.o targets which finally
  26 # turn into vmlinux), we will call a sub make in that other dir, and
  27 # after that we are sure that everything which is in that other dir
  28 # is now up to date.
  29 #
  30 # The only cases where we need to modify files which have global
  31 # effects are thus separated out and done before the recursive
  32 # descending is started. They are now explicitly listed as the
  33 # prepare rule.
  34
  35 # To put more focus on warnings, be less verbose as default
  36 # Use 'make V=1' to see the full commands
  37
  38 ifdef V
  39   ifeq ("$(origin V)", "command line")
  40     KBUILD_VERBOSE = $(V)
  41   endif
  42 endif
  43 ifndef KBUILD_VERBOSE
  44   KBUILD_VERBOSE = 0
  45 endif
  46
  47 # Call a source code checker (by default, "sparse") as part of the
  48 # C compilation.
  49 #
  50 # Use 'make C=1' to enable checking of only re-compiled files.
  51 # Use 'make C=2' to enable checking of *all* source files, regardless
  52 # of whether they are re-compiled or not.
  53 #
  54 # See the file "Documentation/sparse.txt" for more details, including
  55 # where to get the "sparse" utility.
  56
  57 ifdef C
  58   ifeq ("$(origin C)", "command line")
  59     KBUILD_CHECKSRC = $(C)
  60   endif
  61 endif
  62 ifndef KBUILD_CHECKSRC
  63   KBUILD_CHECKSRC = 0
  64 endif
  65
  66 # Use make M=dir to specify directory of external module to build
  67 # Old syntax make ... SUBDIRS=$PWD is still supported
  68 # Setting the environment variable KBUILD_EXTMOD take precedence
  69 ifdef SUBDIRS
  70   KBUILD_EXTMOD ?= $(SUBDIRS)
  71 endif
  72 ifdef M
  73   ifeq ("$(origin M)", "command line")
  74     KBUILD_EXTMOD := $(M)
  75   endif
  76 endif
  77
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(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 ifdef O
 102   ifeq ("$(origin O)", "command line")
 103     KBUILD_OUTPUT := $(O)
 104   endif
 105 endif
 106
 107 # That's our default target when none is given on the command line
 108 PHONY := _all
 109 _all:
 110
 111 # Cancel implicit rules on top Makefile
 112 $(CURDIR)/Makefile Makefile: ;
 113
 114 ifneq ($(KBUILD_OUTPUT),)
 115 # Invoke a second make in the output directory, passing relevant variables
 116 # check that the output directory actually exists
 117 saved-output := $(KBUILD_OUTPUT)
 118 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 119 $(if $(KBUILD_OUTPUT),, \
 120      $(error output directory "$(saved-output)" does not exist))
 121
 122 PHONY += $(MAKECMDGOALS) sub-make
 123
 124 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 125         $(Q)@:
 126
 127 sub-make: FORCE
 128         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 129         KBUILD_SRC=$(CURDIR) \
 130         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 131         $(filter-out _all sub-make,$(MAKECMDGOALS))
 132
 133 # Leave processing to above invocation of make
 134 skip-makefile := 1
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136 endif # ifeq ($(KBUILD_SRC),)
 137
 138 # We process the rest of the Makefile if this is the final invocation of make
 139 ifeq ($(skip-makefile),)
 140
 141 # If building an external module we do not care about the all: rule
 142 # but instead _all depend on modules
 143 PHONY += all
 144 ifeq ($(KBUILD_EXTMOD),)
 145 _all: all
 146 else
 147 _all: modules
 148 endif
 149
 150 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 151 TOPDIR          := $(srctree)
 152 # FIXME - TOPDIR is obsolete, use srctree/objtree
 153 objtree         := $(CURDIR)
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH TOPDIR
 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 # Default value for CROSS_COMPILE is not to prefix executables
 191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192
 193 export KBUILD_BUILDHOST := $(SUBARCH)
 194 ARCH            ?= mips
 195 CROSS_COMPILE   ?=
 196
 197 # Architecture as present in compile.h
 198 UTS_MACHINE     := $(ARCH)
 199 SRCARCH         := $(ARCH)
 200
 201 # Additional ARCH settings for x86
 202 ifeq ($(ARCH),i386)
 203         SRCARCH := x86
 204 endif
 205 ifeq ($(ARCH),x86_64)
 206         SRCARCH := x86
 207 endif
 208
 209 # Additional ARCH settings for sparc
 210 ifeq ($(ARCH),sparc64)
 211        SRCARCH := sparc
 212 endif
 213
 214 # Additional ARCH settings for sh
 215 ifeq ($(ARCH),sh64)
 216        SRCARCH := sh
 217 endif
 218
 219 # Where to locate arch specific headers
 220 hdr-arch  := $(SRCARCH)
 221
 222 ifeq ($(ARCH),m68knommu)
 223        hdr-arch  := m68k
 224 endif
 225
 226 KCONFIG_CONFIG  ?= .config
 227
 228 # SHELL used by kbuild
 229 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 230           else if [ -x /bin/bash ]; then echo /bin/bash; \
 231           else echo sh; fi ; fi)
 232
 233 HOSTCC       = gcc
 234 HOSTCXX      = g++
 235 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 236 HOSTCXXFLAGS = -O2
 237
 238 # Decide whether to build built-in, modular, or both.
 239 # Normally, just do built-in.
 240
 241 KBUILD_MODULES :=
 242 KBUILD_BUILTIN := 1
 243
 244 #       If we have only "make modules", don't compile built-in objects.
 245 #       When we're building modules with modversions, we need to consider
 246 #       the built-in objects during the descend as well, in order to
 247 #       make sure the checksums are up to date before we record them.
 248
 249 ifeq ($(MAKECMDGOALS),modules)
 250   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 251 endif
 252
 253 #       If we have "make <whatever> modules", compile modules
 254 #       in addition to whatever we do anyway.
 255 #       Just "make" or "make all" shall build modules as well
 256
 257 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 258   KBUILD_MODULES := 1
 259 endif
 260
 261 ifeq ($(MAKECMDGOALS),)
 262   KBUILD_MODULES := 1
 263 endif
 264
 265 export KBUILD_MODULES KBUILD_BUILTIN
 266 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 267
 268 # Beautify output
 269 # ---------------------------------------------------------------------------
 270 #
 271 # Normally, we echo the whole command before executing it. By making
 272 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 273 # $(quiet) to choose other forms of output instead, e.g.
 274 #
 275 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 276 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 277 #
 278 # If $(quiet) is empty, the whole command will be printed.
 279 # If it is set to "quiet_", only the short version will be printed.
 280 # If it is set to "silent_", nothing will be printed at all, since
 281 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 282 #
 283 # A simple variant is to prefix commands with $(Q) - that's useful
 284 # for commands that shall be hidden in non-verbose mode.
 285 #
 286 #       $(Q)ln $@ :<
 287 #
 288 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 289 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 290
 291 ifeq ($(KBUILD_VERBOSE),1)
 292   quiet =
 293   Q =
 294 else
 295   quiet=quiet_
 296   Q = @
 297 endif
 298
 299 # If the user is running make -s (silent mode), suppress echoing of
 300 # commands
 301
 302 ifneq ($(findstring s,$(MAKEFLAGS)),)
 303   quiet=silent_
 304 endif
 305
 306 export quiet Q KBUILD_VERBOSE
 307
 308
 309 # Look for make include files relative to root of kernel src
 310 MAKEFLAGS += --include-dir=$(srctree)
 311
 312 # We need some generic definitions (do not try to remake the file).
 313 $(srctree)/scripts/Kbuild.include: ;
 314 include $(srctree)/scripts/Kbuild.include
 315
 316 # Make variables (CC, etc...)
 317
 318 AS              = $(CROSS_COMPILE)as
 319 LD              = $(CROSS_COMPILE)ld
 320 CC              = $(CROSS_COMPILE)gcc
 321 CPP             = $(CC) -E
 322 AR              = $(CROSS_COMPILE)ar
 323 NM              = $(CROSS_COMPILE)nm
 324 STRIP           = $(CROSS_COMPILE)strip
 325 OBJCOPY         = $(CROSS_COMPILE)objcopy
 326 OBJDUMP         = $(CROSS_COMPILE)objdump
 327 AWK             = awk
 328 GENKSYMS        = scripts/genksyms/genksyms
 329 DEPMOD          = /sbin/depmod
 330 KALLSYMS        = scripts/kallsyms
 331 PERL            = perl
 332 CHECK           = sparse
 333
 334 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 335                   -Wbitwise -Wno-return-void $(CF)
 336 MODFLAGS        = -DMODULE
 337 CFLAGS_MODULE   = $(MODFLAGS)
 338 AFLAGS_MODULE   = $(MODFLAGS)
 339 LDFLAGS_MODULE  =
 340 CFLAGS_KERNEL   =
 341 AFLAGS_KERNEL   =
 342
 343
 344 # Use LINUXINCLUDE when you must reference the include/ directory.
 345 # Needed to be compatible with the O= option
 346 LINUXINCLUDE    := -Iinclude \
 347                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 348                    -I$(srctree)/arch/$(hdr-arch)/include               \
 349                    -include include/linux/autoconf.h
 350
 351 KBUILD_CPPFLAGS := -D__KERNEL__
 352
 353 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 354                    -fno-strict-aliasing -fno-common \
 355                    -Werror-implicit-function-declaration
 356 KBUILD_AFLAGS   := -D__ASSEMBLY__
 357
 358 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 359 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 360 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 361
 362 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 363 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 364 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 365 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 366
 367 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 368 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 369 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 370
 371 # When compiling out-of-tree modules, put MODVERDIR in the module
 372 # tree rather than in the kernel tree. The kernel tree might
 373 # even be read-only.
 374 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 375
 376 # Files to ignore in find ... statements
 377
 378 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 379 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 380
 381 # ===========================================================================
 382 # Rules shared between *config targets and build targets
 383
 384 # Basic helpers built in scripts/
 385 PHONY += scripts_basic
 386 scripts_basic:
 387         $(Q)$(MAKE) $(build)=scripts/basic
 388
 389 # To avoid any implicit rule to kick in, define an empty command.
 390 scripts/basic/%: scripts_basic ;
 391
 392 PHONY += outputmakefile
 393 # outputmakefile generates a Makefile in the output directory, if using a
 394 # separate output directory. This allows convenient use of make in the
 395 # output directory.
 396 outputmakefile:
 397 ifneq ($(KBUILD_SRC),)
 398         $(Q)ln -fsn $(srctree) source
 399         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 400             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 401 endif
 402
 403 # To make sure we do not include .config for any of the *config targets
 404 # catch them early, and hand them over to scripts/kconfig/Makefile
 405 # It is allowed to specify more targets when calling make, including
 406 # mixing *config targets and build targets.
 407 # For example 'make oldconfig all'.
 408 # Detect when mixed targets is specified, and make a second invocation
 409 # of make so .config is not included in this case either (for *config).
 410
 411 no-dot-config-targets := clean mrproper distclean \
 412                          cscope TAGS tags help %docs check% \
 413                          include/linux/version.h headers_% \
 414                          kernelrelease kernelversion
 415
 416 config-targets := 0
 417 mixed-targets  := 0
 418 dot-config     := 1
 419
 420 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 421         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 422                 dot-config := 0
 423         endif
 424 endif
 425
 426 ifeq ($(KBUILD_EXTMOD),)
 427         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 428                 config-targets := 1
 429                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 430                         mixed-targets := 1
 431                 endif
 432         endif
 433 endif
 434
 435 ifeq ($(mixed-targets),1)
 436 # ===========================================================================
 437 # We're called with mixed targets (*config and build targets).
 438 # Handle them one by one.
 439
 440 %:: FORCE
 441         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 442
 443 else
 444 ifeq ($(config-targets),1)
 445 # ===========================================================================
 446 # *config targets only - make sure prerequisites are updated, and descend
 447 # in scripts/kconfig to make the *config target
 448
 449 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 450 # KBUILD_DEFCONFIG may point out an alternative default configuration
 451 # used for 'make defconfig'
 452 include $(srctree)/arch/$(SRCARCH)/Makefile
 453 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 454
 455 config: scripts_basic outputmakefile FORCE
 456         $(Q)mkdir -p include/linux include/config
 457         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 458
 459 %config: scripts_basic outputmakefile FORCE
 460         $(Q)mkdir -p include/linux include/config
 461         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 462
 463 else
 464 # ===========================================================================
 465 # Build targets only - this includes vmlinux, arch specific targets, clean
 466 # targets and others. In general all targets except *config targets.
 467
 468 ifeq ($(KBUILD_EXTMOD),)
 469 # Additional helpers built in scripts/
 470 # Carefully list dependencies so we do not try to build scripts twice
 471 # in parallel
 472 PHONY += scripts
 473 scripts: scripts_basic include/config/auto.conf
 474         $(Q)$(MAKE) $(build)=$(@)
 475
 476 # Objects we will link into vmlinux / subdirs we need to visit
 477 init-y          := init/
 478 drivers-y       := drivers/ sound/ firmware/
 479 net-y           := net/
 480 libs-y          := lib/
 481 core-y          := usr/
 482 endif # KBUILD_EXTMOD
 483
 484 ifeq ($(dot-config),1)
 485 # Read in config
 486 -include include/config/auto.conf
 487
 488 ifeq ($(KBUILD_EXTMOD),)
 489 # Read in dependencies to all Kconfig* files, make sure to run
 490 # oldconfig if changes are detected.
 491 -include include/config/auto.conf.cmd
 492
 493 # To avoid any implicit rule to kick in, define an empty command
 494 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 495
 496 # If .config is newer than include/config/auto.conf, someone tinkered
 497 # with it and forgot to run make oldconfig.
 498 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 499 # we execute the config step to be sure to catch updated Kconfig files
 500 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 501         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 502 else
 503 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 504 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 505 PHONY += include/config/auto.conf
 506
 507 include/config/auto.conf:
 508         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 509         echo;                                                           \
 510         echo "  ERROR: Kernel configuration is invalid.";               \
 511         echo "         include/linux/autoconf.h or $@ are missing.";    \
 512         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 513         echo;                                                           \
 514         /bin/false)
 515
 516 endif # KBUILD_EXTMOD
 517
 518 else
 519 # Dummy target needed, because used as prerequisite
 520 include/config/auto.conf: ;
 521 endif # $(dot-config)
 522
 523 # The all: target is the default when no target is given on the
 524 # command line.
 525 # This allow a user to issue only 'make' to build a kernel including modules
 526 # Defaults vmlinux but it is usually overridden in the arch makefile
 527 all: vmlinux
 528
 529 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 530 KBUILD_CFLAGS   += -Os
 531 else
 532 KBUILD_CFLAGS   += -O2
 533 endif
 534
 535 include $(srctree)/arch/$(SRCARCH)/Makefile
 536
 537 ifneq (CONFIG_FRAME_WARN,0)
 538 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 539 endif
 540
 541 # Force gcc to behave correct even for buggy distributions
 542 ifndef CONFIG_CC_STACKPROTECTOR
 543 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 544 endif
 545
 546 ifdef CONFIG_FRAME_POINTER
 547 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 548 else
 549 KBUILD_CFLAGS   += -fomit-frame-pointer
 550 endif
 551
 552 ifdef CONFIG_DEBUG_INFO
 553 KBUILD_CFLAGS   += -g
 554 KBUILD_AFLAGS   += -gdwarf-2
 555 endif
 556
 557 ifdef CONFIG_FUNCTION_TRACER
 558 KBUILD_CFLAGS   += -pg
 559 endif
 560
 561 # We trigger additional mismatches with less inlining
 562 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 563 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 564 endif
 565
 566 # arch Makefile may override CC so keep this after arch Makefile is included
 567 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 568 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 569
 570 # warn about C99 declaration after statement
 571 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 572
 573 # disable pointer signed / unsigned warnings in gcc 4.0
 574 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 575
 576 # disable invalid "can't wrap" optimizations for signed / pointers
 577 KBUILD_CFLAGS   += $(call cc-option,-fwrapv)
 578
 579 # revert to pre-gcc-4.4 behaviour of .eh_frame
 580 KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 581
 582 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 583 # But warn user when we do so
 584 warn-assign = \
 585 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 586
 587 ifneq ($(KCPPFLAGS),)
 588         $(call warn-assign,CPPFLAGS)
 589         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 590 endif
 591 ifneq ($(KAFLAGS),)
 592         $(call warn-assign,AFLAGS)
 593         KBUILD_AFLAGS += $(KAFLAGS)
 594 endif
 595 ifneq ($(KCFLAGS),)
 596         $(call warn-assign,CFLAGS)
 597         KBUILD_CFLAGS += $(KCFLAGS)
 598 endif
 599
 600 # Use --build-id when available.
 601 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 602                               $(call ld-option, -Wl$(comma)--build-id,))
 603 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 604 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 605
 606 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 607 LDFLAGS_vmlinux += -X
 608 endif
 609
 610 # Default kernel image to build when no specific target is given.
 611 # KBUILD_IMAGE may be overruled on the command line or
 612 # set in the environment
 613 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 614 # this default value
 615 export KBUILD_IMAGE ?= vmlinux
 616
 617 #
 618 # INSTALL_PATH specifies where to place the updated kernel and system map
 619 # images. Default is /boot, but you can set it to other values
 620 export  INSTALL_PATH ?= /boot
 621
 622 #
 623 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 624 # relocations required by build roots.  This is not defined in the
 625 # makefile but the argument can be passed to make if needed.
 626 #
 627
 628 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 629 export MODLIB
 630
 631 #
 632 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 633 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 634 #  the default option --strip-debug will be used.  Otherwise,
 635 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 636
 637 ifdef INSTALL_MOD_STRIP
 638 ifeq ($(INSTALL_MOD_STRIP),1)
 639 mod_strip_cmd = $(STRIP) --strip-debug
 640 else
 641 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 642 endif # INSTALL_MOD_STRIP=1
 643 else
 644 mod_strip_cmd = true
 645 endif # INSTALL_MOD_STRIP
 646 export mod_strip_cmd
 647
 648
 649 ifeq ($(KBUILD_EXTMOD),)
 650 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 651
 652 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 653                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 654                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 655
 656 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 657                      $(init-n) $(init-) \
 658                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 659                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 660
 661 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 662 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 663 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 664 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 665 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 666 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 667 libs-y          := $(libs-y1) $(libs-y2)
 668
 669 # Build vmlinux
 670 # ---------------------------------------------------------------------------
 671 # vmlinux is built from the objects selected by $(vmlinux-init) and
 672 # $(vmlinux-main). Most are built-in.o files from top-level directories
 673 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 674 # Ordering when linking is important, and $(vmlinux-init) must be first.
 675 #
 676 # vmlinux
 677 #   ^
 678 #   |
 679 #   +-< $(vmlinux-init)
 680 #   |   +--< init/version.o + more
 681 #   |
 682 #   +--< $(vmlinux-main)
 683 #   |    +--< driver/built-in.o mm/built-in.o + more
 684 #   |
 685 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 686 #
 687 # vmlinux version (uname -v) cannot be updated during normal
 688 # descending-into-subdirs phase since we do not yet know if we need to
 689 # update vmlinux.
 690 # Therefore this step is delayed until just before final link of vmlinux -
 691 # except in the kallsyms case where it is done just before adding the
 692 # symbols to the kernel.
 693 #
 694 # System.map is generated to document addresses of all kernel symbols
 695
 696 vmlinux-init := $(head-y) $(init-y)
 697 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 698 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 699 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 700 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 701
 702 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 703 # May be overridden by arch/$(ARCH)/Makefile
 704 quiet_cmd_vmlinux__ ?= LD      $@
 705       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 706       -T $(vmlinux-lds) $(vmlinux-init)                          \
 707       --start-group $(vmlinux-main) --end-group                  \
 708       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 709
 710 # Generate new vmlinux version
 711 quiet_cmd_vmlinux_version = GEN     .version
 712       cmd_vmlinux_version = set -e;                     \
 713         if [ ! -r .version ]; then                      \
 714           rm -f .version;                               \
 715           echo 1 >.version;                             \
 716         else                                            \
 717           mv .version .old_version;                     \
 718           expr 0$$(cat .old_version) + 1 >.version;     \
 719         fi;                                             \
 720         $(MAKE) $(build)=init
 721
 722 # Generate System.map
 723 quiet_cmd_sysmap = SYSMAP
 724       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 725
 726 # Link of vmlinux
 727 # If CONFIG_KALLSYMS is set .version is already updated
 728 # Generate System.map and verify that the content is consistent
 729 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 730 # First command is ':' to allow us to use + in front of the rule
 731 define rule_vmlinux__
 732         :
 733         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 734
 735         $(call cmd,vmlinux__)
 736         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 737
 738         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 739           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 740         $(cmd_sysmap) $@ System.map;                                         \
 741         if [ $$? -ne 0 ]; then                                               \
 742                 rm -f $@;                                                    \
 743                 /bin/false;                                                  \
 744         fi;
 745         $(verify_kallsyms)
 746 endef
 747
 748
 749 ifdef CONFIG_KALLSYMS
 750 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 751 # It's a three stage process:
 752 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 753 #   empty
 754 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 755 #   the right size - vmlinux version (uname -v) is updated during this step
 756 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 757 #   but due to the added section, some addresses have shifted.
 758 #   From here, we generate a correct .tmp_kallsyms2.o
 759 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 760 # o Verify that the System.map from vmlinux matches the map from
 761 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 762 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 763 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 764 #   temporary bypass to allow the kernel to be built while the
 765 #   maintainers work out what went wrong with kallsyms.
 766
 767 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 768 last_kallsyms := 3
 769 else
 770 last_kallsyms := 2
 771 endif
 772
 773 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 774
 775 define verify_kallsyms
 776         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 777           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 778           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 779         $(Q)cmp -s System.map .tmp_System.map ||                             \
 780                 (echo Inconsistent kallsyms data;                            \
 781                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 782                  rm .tmp_kallsyms* ; /bin/false )
 783 endef
 784
 785 # Update vmlinux version before link
 786 # Use + in front of this rule to silent warning about make -j1
 787 # First command is ':' to allow us to use + in front of this rule
 788 cmd_ksym_ld = $(cmd_vmlinux__)
 789 define rule_ksym_ld
 790         :
 791         +$(call cmd,vmlinux_version)
 792         $(call cmd,vmlinux__)
 793         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 794 endef
 795
 796 # Generate .S file with all kernel symbols
 797 quiet_cmd_kallsyms = KSYM    $@
 798       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 799                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 800
 801 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 802         $(call if_changed_dep,as_o_S)
 803
 804 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 805         $(call cmd,kallsyms)
 806
 807 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 808 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 809         $(call if_changed_rule,ksym_ld)
 810
 811 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 812         $(call if_changed,vmlinux__)
 813
 814 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 815         $(call if_changed,vmlinux__)
 816
 817 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 818 $(KALLSYMS): scripts ;
 819
 820 # Generate some data for debugging strange kallsyms problems
 821 debug_kallsyms: .tmp_map$(last_kallsyms)
 822
 823 .tmp_map%: .tmp_vmlinux% FORCE
 824         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 825
 826 .tmp_map3: .tmp_map2
 827
 828 .tmp_map2: .tmp_map1
 829
 830 endif # ifdef CONFIG_KALLSYMS
 831
 832 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 833 # relevant sections renamed as per the linker script.
 834 quiet_cmd_vmlinux-modpost = LD      $@
 835       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 836          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 837          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 838 define rule_vmlinux-modpost
 839         :
 840         +$(call cmd,vmlinux-modpost)
 841         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 842         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 843 endef
 844
 845 # vmlinux image - including updated kernel symbols
 846 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 847 ifdef CONFIG_HEADERS_CHECK
 848         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 849 endif
 850 ifdef CONFIG_SAMPLES
 851         $(Q)$(MAKE) $(build)=samples
 852 endif
 853 ifdef CONFIG_BUILD_DOCSRC
 854         $(Q)$(MAKE) $(build)=Documentation
 855 endif
 856         $(call vmlinux-modpost)
 857         $(call if_changed_rule,vmlinux__)
 858         $(Q)rm -f .old_version
 859
 860 # build vmlinux.o first to catch section mismatch errors early
 861 ifdef CONFIG_KALLSYMS
 862 .tmp_vmlinux1: vmlinux.o
 863 endif
 864
 865 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 866 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 867         $(call if_changed_rule,vmlinux-modpost)
 868
 869 # The actual objects are generated when descending,
 870 # make sure no implicit rule kicks in
 871 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 872
 873 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 874 # Preset locale variables to speed up the build process. Limit locale
 875 # tweaks to this spot to avoid wrong language settings when running
 876 # make menuconfig etc.
 877 # Error messages still appears in the original language
 878
 879 PHONY += $(vmlinux-dirs)
 880 $(vmlinux-dirs): prepare scripts
 881         $(Q)$(MAKE) $(build)=$@
 882
 883 # Build the kernel release string
 884 #
 885 # The KERNELRELEASE value built here is stored in the file
 886 # include/config/kernel.release, and is used when executing several
 887 # make targets, such as "make install" or "make modules_install."
 888 #
 889 # The eventual kernel release string consists of the following fields,
 890 # shown in a hierarchical format to show how smaller parts are concatenated
 891 # to form the larger and final value, with values coming from places like
 892 # the Makefile, kernel config options, make command line options and/or
 893 # SCM tag information.
 894 #
 895 #       $(KERNELVERSION)
 896 #         $(VERSION)                    eg, 2
 897 #         $(PATCHLEVEL)                 eg, 6
 898 #         $(SUBLEVEL)                   eg, 18
 899 #         $(EXTRAVERSION)               eg, -rc6
 900 #       $(localver-full)
 901 #         $(localver)
 902 #           localversion*               (files without backups, containing '~')
 903 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 904 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 905 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 906 #           $(LOCALVERSION)             (from make command line if provided)
 907 #
 908 #  Note how the final $(localver-auto) string is included *only* if the
 909 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 910 # moment, only git is supported but other SCMs can edit the script
 911 # scripts/setlocalversion and add the appropriate checks as needed.
 912
 913 pattern = ".*/localversion[^~]*"
 914 string  = $(shell cat /dev/null \
 915            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 916
 917 localver = $(subst $(space),, $(string) \
 918                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 919
 920 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 921 # and if the SCM is know a tag from the SCM is appended.
 922 # The appended tag is determined by the SCM used.
 923 #
 924 # .scmversion is used when generating rpm packages so we do not loose
 925 # the version information from the SCM when we do the build of the kernel
 926 # from the copied source
 927 ifdef CONFIG_LOCALVERSION_AUTO
 928
 929 ifeq ($(wildcard .scmversion),)
 930         _localver-auto = $(shell $(CONFIG_SHELL) \
 931                          $(srctree)/scripts/setlocalversion $(srctree))
 932 else
 933         _localver-auto = $(shell cat .scmversion 2> /dev/null)
 934 endif
 935
 936         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 937 endif
 938
 939 localver-full = $(localver)$(localver-auto)
 940
 941 # Store (new) KERNELRELASE string in include/config/kernel.release
 942 kernelrelease = $(KERNELVERSION)$(localver-full)
 943 include/config/kernel.release: include/config/auto.conf FORCE
 944         $(Q)rm -f $@
 945         $(Q)echo $(kernelrelease) > $@
 946
 947
 948 # Things we need to do before we recursively start building the kernel
 949 # or the modules are listed in "prepare".
 950 # A multi level approach is used. prepareN is processed before prepareN-1.
 951 # archprepare is used in arch Makefiles and when processed asm symlink,
 952 # version.h and scripts_basic is processed / created.
 953
 954 # Listed in dependency order
 955 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 956
 957 # prepare3 is used to check if we are building in a separate output directory,
 958 # and if so do:
 959 # 1) Check that make has not been executed in the kernel src $(srctree)
 960 # 2) Create the include2 directory, used for the second asm symlink
 961 prepare3: include/config/kernel.release
 962 ifneq ($(KBUILD_SRC),)
 963         @$(kecho) '  Using $(srctree) as source for kernel'
 964         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 965                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 966                 echo "  in the '$(srctree)' directory.";\
 967                 /bin/false; \
 968         fi;
 969         $(Q)if [ ! -d include2 ]; then                                  \
 970             mkdir -p include2;                                          \
 971             ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 972         fi
 973 endif
 974
 975 # prepare2 creates a makefile if using a separate output directory
 976 prepare2: prepare3 outputmakefile
 977
 978 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 979                    include/asm include/config/auto.conf
 980         $(cmd_crmodverdir)
 981
 982 archprepare: prepare1 scripts_basic
 983
 984 prepare0: archprepare FORCE
 985         $(Q)$(MAKE) $(build)=.
 986         $(Q)$(MAKE) $(build)=. missing-syscalls
 987
 988 # All the preparing..
 989 prepare: prepare0
 990
 991 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 992 # done in arch/$(ARCH)/kernel/Makefile
 993
 994 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 995
 996 # The asm symlink changes when $(ARCH) changes.
 997 # Detect this and ask user to run make mrproper
 998 # If asm is a stale symlink (point to dir that does not exist) remove it
 999 define check-symlink
1000         set -e;                                                            \
1001         if [ -L include/asm ]; then                                        \
1002                 asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
1003                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
1004                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1005                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
1006                         exit 1;                                            \
1007                 fi;                                                        \
1008                 test -e $$asmlink || rm include/asm;                       \
1009         elif [ -d include/asm ]; then                                      \
1010                 echo "ERROR: $@ is a directory but a symlink was expected";\
1011                 exit 1;                                                    \
1012         fi
1013 endef
1014
1015 # We create the target directory of the symlink if it does
1016 # not exist so the test in check-symlink works and we have a
1017 # directory for generated filesas used by some architectures.
1018 define create-symlink
1019         if [ ! -L include/asm ]; then                                      \
1020                         $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1021                         if [ ! -d include/asm-$(SRCARCH) ]; then           \
1022                                 mkdir -p include/asm-$(SRCARCH);           \
1023                         fi;                                                \
1024                         ln -fsn asm-$(SRCARCH) $@;                         \
1025         fi
1026 endef
1027
1028 include/asm: FORCE
1029         $(Q)$(check-symlink)
1030         $(Q)$(create-symlink)
1031
1032 # Generate some files
1033 # ---------------------------------------------------------------------------
1034
1035 # KERNELRELEASE can change from a few different places, meaning version.h
1036 # needs to be updated, so this check is forced on all builds
1037
1038 uts_len := 64
1039 define filechk_utsrelease.h
1040         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1041           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1042           exit 1;                                                         \
1043         fi;                                                               \
1044         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1045 endef
1046
1047 define filechk_version.h
1048         (echo \#define LINUX_VERSION_CODE $(shell                             \
1049         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1050         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1051 endef
1052
1053 include/linux/version.h: $(srctree)/Makefile FORCE
1054         $(call filechk,version.h)
1055
1056 include/linux/utsrelease.h: include/config/kernel.release FORCE
1057         $(call filechk,utsrelease.h)
1058
1059 PHONY += headerdep
1060 headerdep:
1061         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1062
1063 # ---------------------------------------------------------------------------
1064
1065 PHONY += depend dep
1066 depend dep:
1067         @echo '*** Warning: make $@ is unnecessary now.'
1068
1069 # ---------------------------------------------------------------------------
1070 # Firmware install
1071 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1072 export INSTALL_FW_PATH
1073
1074 PHONY += firmware_install
1075 firmware_install: FORCE
1076         @mkdir -p $(objtree)/firmware
1077         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1078
1079 # ---------------------------------------------------------------------------
1080 # Kernel headers
1081
1082 #Default location for installed headers
1083 export INSTALL_HDR_PATH = $(objtree)/usr
1084
1085 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1086 # Find out where the Kbuild file is located to support
1087 # arch/$(ARCH)/include/asm
1088 hdr-dir = $(strip                                                         \
1089           $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1090                arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1091
1092 # If we do an all arch process set dst to asm-$(hdr-arch)
1093 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1094
1095 PHONY += __headers
1096 __headers: include/linux/version.h scripts_basic FORCE
1097         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1098
1099 PHONY += headers_install_all
1100 headers_install_all:
1101         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1102
1103 PHONY += headers_install
1104 headers_install: __headers
1105         $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1106         $(error Headers not exportable for the $(SRCARCH) architecture))
1107         $(Q)$(MAKE) $(hdr-inst)=include
1108         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1109
1110 PHONY += headers_check_all
1111 headers_check_all: headers_install_all
1112         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1113
1114 PHONY += headers_check
1115 headers_check: headers_install
1116         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1117         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1118
1119 # ---------------------------------------------------------------------------
1120 # Modules
1121
1122 ifdef CONFIG_MODULES
1123
1124 # By default, build modules as well
1125
1126 all: modules
1127
1128 #       Build modules
1129 #
1130 #       A module can be listed more than once in obj-m resulting in
1131 #       duplicate lines in modules.order files.  Those are removed
1132 #       using awk while concatenating to the final file.
1133
1134 PHONY += modules
1135 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1136         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1137         @$(kecho) '  Building modules, stage 2.';
1138         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1139         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1140
1141
1142 # Target to prepare building external modules
1143 PHONY += modules_prepare
1144 modules_prepare: prepare scripts
1145
1146 # Target to install modules
1147 PHONY += modules_install
1148 modules_install: _modinst_ _modinst_post
1149
1150 PHONY += _modinst_
1151 _modinst_:
1152         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1153                 echo "Warning: you may need to install module-init-tools"; \
1154                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1155                 sleep 1; \
1156         fi
1157         @rm -rf $(MODLIB)/kernel
1158         @rm -f $(MODLIB)/source
1159         @mkdir -p $(MODLIB)/kernel
1160         @ln -s $(srctree) $(MODLIB)/source
1161         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1162                 rm -f $(MODLIB)/build ; \
1163                 ln -s $(objtree) $(MODLIB)/build ; \
1164         fi
1165         @cp -f $(objtree)/modules.order $(MODLIB)/
1166         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1167
1168 # This depmod is only for convenience to give the initial
1169 # boot a modules.dep even before / is mounted read-write.  However the
1170 # boot script depmod is the master version.
1171 PHONY += _modinst_post
1172 _modinst_post: _modinst_
1173         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1174         $(call cmd,depmod)
1175
1176 else # CONFIG_MODULES
1177
1178 # Modules not configured
1179 # ---------------------------------------------------------------------------
1180
1181 modules modules_install: FORCE
1182         @echo
1183         @echo "The present kernel configuration has modules disabled."
1184         @echo "Type 'make config' and enable loadable module support."
1185         @echo "Then build a kernel with module support enabled."
1186         @echo
1187         @exit 1
1188
1189 endif # CONFIG_MODULES
1190
1191 ###
1192 # Cleaning is done on three levels.
1193 # make clean     Delete most generated files
1194 #                Leave enough to build external modules
1195 # make mrproper  Delete the current configuration, and all generated files
1196 # make distclean Remove editor backup files, patch leftover files and the like
1197
1198 # Directories & files removed with 'make clean'
1199 CLEAN_DIRS  += $(MODVERDIR)
1200 CLEAN_FILES +=  vmlinux System.map \
1201                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1202
1203 # Directories & files removed with 'make mrproper'
1204 MRPROPER_DIRS  += include/config include2 usr/include include/generated
1205 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1206                   include/linux/autoconf.h include/linux/version.h      \
1207                   include/linux/utsrelease.h                            \
1208                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1209                   Module.symvers Module.markers tags TAGS cscope*
1210
1211 # clean - Delete most, but leave enough to build external modules
1212 #
1213 clean: rm-dirs  := $(CLEAN_DIRS)
1214 clean: rm-files := $(CLEAN_FILES)
1215 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1216
1217 PHONY += $(clean-dirs) clean archclean
1218 $(clean-dirs):
1219         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1220
1221 clean: archclean $(clean-dirs)
1222         $(call cmd,rmdirs)
1223         $(call cmd,rmfiles)
1224         @find . $(RCS_FIND_IGNORE) \
1225                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1226                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1227                 -o -name '*.symtypes' -o -name 'modules.order' \
1228                 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1229                 -type f -print | xargs rm -f
1230
1231 # mrproper - Delete all generated files, including .config
1232 #
1233 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1234 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1235 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1236
1237 PHONY += $(mrproper-dirs) mrproper archmrproper
1238 $(mrproper-dirs):
1239         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1240
1241 mrproper: clean archmrproper $(mrproper-dirs)
1242         $(call cmd,rmdirs)
1243         $(call cmd,rmfiles)
1244
1245 # distclean
1246 #
1247 PHONY += distclean
1248
1249 distclean: mrproper
1250         @find $(srctree) $(RCS_FIND_IGNORE) \
1251                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1252                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1253                 -o -name '.*.rej' -o -size 0 \
1254                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1255                 -type f -print | xargs rm -f
1256
1257
1258 # Packaging of the kernel to various formats
1259 # ---------------------------------------------------------------------------
1260 # rpm target kept for backward compatibility
1261 package-dir     := $(srctree)/scripts/package
1262
1263 %pkg: include/config/kernel.release FORCE
1264         $(Q)$(MAKE) $(build)=$(package-dir) $@
1265 rpm: include/config/kernel.release FORCE
1266         $(Q)$(MAKE) $(build)=$(package-dir) $@
1267
1268
1269 # Brief documentation of the typical targets used
1270 # ---------------------------------------------------------------------------
1271
1272 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1273 boards := $(notdir $(boards))
1274 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1275 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1276
1277 help:
1278         @echo  'Cleaning targets:'
1279         @echo  '  clean           - Remove most generated files but keep the config and'
1280         @echo  '                    enough build support to build external modules'
1281         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1282         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1283         @echo  ''
1284         @echo  'Configuration targets:'
1285         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1286         @echo  ''
1287         @echo  'Other generic targets:'
1288         @echo  '  all             - Build all targets marked with [*]'
1289         @echo  '* vmlinux         - Build the bare kernel'
1290         @echo  '* modules         - Build all modules'
1291         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1292         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1293         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1294         @echo  '  dir/            - Build all files in dir and below'
1295         @echo  '  dir/file.[ois]  - Build specified target only'
1296         @echo  '  dir/file.ko     - Build module including final link'
1297         @echo  '  modules_prepare - Set up for building external modules'
1298         @echo  '  tags/TAGS       - Generate tags file for editors'
1299         @echo  '  cscope          - Generate cscope index'
1300         @echo  '  kernelrelease   - Output the release version string'
1301         @echo  '  kernelversion   - Output the version stored in Makefile'
1302         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1303          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1304          echo  ''
1305         @echo  'Static analysers'
1306         @echo  '  checkstack      - Generate a list of stack hogs'
1307         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1308         @echo  '  versioncheck    - Sanity check on version.h usage'
1309         @echo  '  includecheck    - Check for duplicate included header files'
1310         @echo  '  export_report   - List the usages of all exported symbols'
1311         @echo  '  headers_check   - Sanity check on exported headers'
1312         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1313          echo  ''
1314         @echo  'Kernel packaging:'
1315         @$(MAKE) $(build)=$(package-dir) help
1316         @echo  ''
1317         @echo  'Documentation targets:'
1318         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1319         @echo  ''
1320         @echo  'Architecture specific targets ($(SRCARCH)):'
1321         @$(if $(archhelp),$(archhelp),\
1322                 echo '  No architecture specific help defined for $(SRCARCH)')
1323         @echo  ''
1324         @$(if $(boards), \
1325                 $(foreach b, $(boards), \
1326                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1327                 echo '')
1328         @$(if $(board-dirs), \
1329                 $(foreach b, $(board-dirs), \
1330                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1331                 printf "  %-16s - Show all of the above\\n" help-boards; \
1332                 echo '')
1333
1334         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1335         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1336         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1337         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1338         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1339         @echo  ''
1340         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1341         @echo  'For further info see the ./README file'
1342
1343
1344 help-board-dirs := $(addprefix help-,$(board-dirs))
1345
1346 help-boards: $(help-board-dirs)
1347
1348 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1349
1350 $(help-board-dirs): help-%:
1351         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1352         @$(if $(boards-per-dir), \
1353                 $(foreach b, $(boards-per-dir), \
1354                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1355                 echo '')
1356
1357
1358 # Documentation targets
1359 # ---------------------------------------------------------------------------
1360 %docs: scripts_basic FORCE
1361         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1362
1363 else # KBUILD_EXTMOD
1364
1365 ###
1366 # External module support.
1367 # When building external modules the kernel used as basis is considered
1368 # read-only, and no consistency checks are made and the make
1369 # system is not used on the basis kernel. If updates are required
1370 # in the basis kernel ordinary make commands (without M=...) must
1371 # be used.
1372 #
1373 # The following are the only valid targets when building external
1374 # modules.
1375 # make M=dir clean     Delete all automatically generated files
1376 # make M=dir modules   Make all modules in specified dir
1377 # make M=dir           Same as 'make M=dir modules'
1378 # make M=dir modules_install
1379 #                      Install the modules built in the module directory
1380 #                      Assumes install directory is already created
1381
1382 # We are always building modules
1383 KBUILD_MODULES := 1
1384 PHONY += crmodverdir
1385 crmodverdir:
1386         $(cmd_crmodverdir)
1387
1388 PHONY += $(objtree)/Module.symvers
1389 $(objtree)/Module.symvers:
1390         @test -e $(objtree)/Module.symvers || ( \
1391         echo; \
1392         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1393         echo "           is missing; modules will have no dependencies and modversions."; \
1394         echo )
1395
1396 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1397 PHONY += $(module-dirs) modules
1398 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1399         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1400
1401 modules: $(module-dirs)
1402         @$(kecho) '  Building modules, stage 2.';
1403         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1404
1405 PHONY += modules_install
1406 modules_install: _emodinst_ _emodinst_post
1407
1408 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1409 PHONY += _emodinst_
1410 _emodinst_:
1411         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1412         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1413
1414 PHONY += _emodinst_post
1415 _emodinst_post: _emodinst_
1416         $(call cmd,depmod)
1417
1418 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1419
1420 PHONY += $(clean-dirs) clean
1421 $(clean-dirs):
1422         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1423
1424 clean:  rm-dirs := $(MODVERDIR)
1425 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1426                    $(KBUILD_EXTMOD)/Module.markers \
1427                    $(KBUILD_EXTMOD)/modules.order
1428 clean: $(clean-dirs)
1429         $(call cmd,rmdirs)
1430         $(call cmd,rmfiles)
1431         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1432                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1433                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1434                 -type f -print | xargs rm -f
1435
1436 help:
1437         @echo  '  Building external modules.'
1438         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1439         @echo  ''
1440         @echo  '  modules         - default target, build the module(s)'
1441         @echo  '  modules_install - install the module'
1442         @echo  '  clean           - remove generated files in module directory only'
1443         @echo  ''
1444
1445 # Dummies...
1446 PHONY += prepare scripts
1447 prepare: ;
1448 scripts: ;
1449 endif # KBUILD_EXTMOD
1450
1451 # Generate tags for editors
1452 # ---------------------------------------------------------------------------
1453 quiet_cmd_tags = GEN     $@
1454       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1455
1456 tags TAGS cscope: FORCE
1457         $(call cmd,tags)
1458
1459 # Scripts to check various things for consistency
1460 # ---------------------------------------------------------------------------
1461
1462 includecheck:
1463         find * $(RCS_FIND_IGNORE) \
1464                 -name '*.[hcS]' -type f -print | sort \
1465                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1466
1467 versioncheck:
1468         find * $(RCS_FIND_IGNORE) \
1469                 -name '*.[hcS]' -type f -print | sort \
1470                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1471
1472 namespacecheck:
1473         $(PERL) $(srctree)/scripts/namespace.pl
1474
1475 export_report:
1476         $(PERL) $(srctree)/scripts/export_report.pl
1477
1478 endif #ifeq ($(config-targets),1)
1479 endif #ifeq ($(mixed-targets),1)
1480
1481 PHONY += checkstack kernelrelease kernelversion
1482
1483 # UML needs a little special treatment here.  It wants to use the host
1484 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1485 # else wants $(ARCH), including people doing cross-builds, which means
1486 # that $(SUBARCH) doesn't work here.
1487 ifeq ($(ARCH), um)
1488 CHECKSTACK_ARCH := $(SUBARCH)
1489 else
1490 CHECKSTACK_ARCH := $(ARCH)
1491 endif
1492 checkstack:
1493         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1494         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1495
1496 kernelrelease:
1497         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1498         $(error kernelrelease not valid - run 'make prepare' to update it))
1499 kernelversion:
1500         @echo $(KERNELVERSION)
1501
1502 # Single targets
1503 # ---------------------------------------------------------------------------
1504 # Single targets are compatible with:
1505 # - build with mixed source and output
1506 # - build with separate output dir 'make O=...'
1507 # - external modules
1508 #
1509 #  target-dir => where to store outputfile
1510 #  build-dir  => directory in kernel source tree to use
1511
1512 ifeq ($(KBUILD_EXTMOD),)
1513         build-dir  = $(patsubst %/,%,$(dir $@))
1514         target-dir = $(dir $@)
1515 else
1516         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1517         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1518         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1519 endif
1520
1521 %.s: %.c prepare scripts FORCE
1522         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523 %.i: %.c prepare scripts FORCE
1524         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525 %.o: %.c prepare scripts FORCE
1526         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527 %.lst: %.c prepare scripts FORCE
1528         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529 %.s: %.S prepare scripts FORCE
1530         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531 %.o: %.S prepare scripts FORCE
1532         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533 %.symtypes: %.c prepare scripts FORCE
1534         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535
1536 # Modules
1537 /: prepare scripts FORCE
1538         $(cmd_crmodverdir)
1539         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1540         $(build)=$(build-dir)
1541 %/: prepare scripts FORCE
1542         $(cmd_crmodverdir)
1543         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1544         $(build)=$(build-dir)
1545 %.ko: prepare scripts FORCE
1546         $(cmd_crmodverdir)
1547         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1548         $(build)=$(build-dir) $(@:.ko=.o)
1549         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1550
1551 # FIXME Should go into a make.lib or something
1552 # ===========================================================================
1553
1554 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1555       cmd_rmdirs = rm -rf $(rm-dirs)
1556
1557 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1558       cmd_rmfiles = rm -f $(rm-files)
1559
1560 # Run depmod only if we have System.map and depmod is executable
1561 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1562       cmd_depmod = \
1563         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1564                 $(DEPMOD) -ae -F System.map                                     \
1565                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1566                 $(KERNELRELEASE);                                               \
1567         fi
1568
1569 # Create temporary dir for module support files
1570 # clean it up only when building all modules
1571 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1572                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1573
1574 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1575           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1576           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1577
1578 quiet_cmd_as_o_S = AS      $@
1579 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1580
1581 # read all saved command lines
1582
1583 targets := $(wildcard $(sort $(targets)))
1584 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1585
1586 ifneq ($(cmd_files),)
1587   $(cmd_files): ;       # Do not try to update included dependency files
1588   include $(cmd_files)
1589 endif
1590
1591 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1592 # Usage:
1593 # $(Q)$(MAKE) $(clean)=dir
1594 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1595
1596 endif   # skip-makefile
1597
1598 PHONY += FORCE
1599 FORCE:
1600
1601 # Declare the contents of the .PHONY variable as phony.  We keep that
1602 # information in a variable so we can use it in if_changed and friends.
1603 .PHONY: $(PHONY)