Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 31
   4 EXTRAVERSION = -rc4
   5 NAME = Man-Eating Seals of Antiquity
   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 ifeq ("$(origin V)", "command line")
  39   KBUILD_VERBOSE = $(V)
  40 endif
  41 ifndef KBUILD_VERBOSE
  42   KBUILD_VERBOSE = 0
  43 endif
  44
  45 # Call a source code checker (by default, "sparse") as part of the
  46 # C compilation.
  47 #
  48 # Use 'make C=1' to enable checking of only re-compiled files.
  49 # Use 'make C=2' to enable checking of *all* source files, regardless
  50 # of whether they are re-compiled or not.
  51 #
  52 # See the file "Documentation/sparse.txt" for more details, including
  53 # where to get the "sparse" utility.
  54
  55 ifeq ("$(origin C)", "command line")
  56   KBUILD_CHECKSRC = $(C)
  57 endif
  58 ifndef KBUILD_CHECKSRC
  59   KBUILD_CHECKSRC = 0
  60 endif
  61
  62 # Use make M=dir to specify directory of external module to build
  63 # Old syntax make ... SUBDIRS=$PWD is still supported
  64 # Setting the environment variable KBUILD_EXTMOD take precedence
  65 ifdef SUBDIRS
  66   KBUILD_EXTMOD ?= $(SUBDIRS)
  67 endif
  68
  69 ifeq ("$(origin M)", "command line")
  70   KBUILD_EXTMOD := $(M)
  71 endif
  72
  73 # kbuild supports saving output files in a separate directory.
  74 # To locate output files in a separate directory two syntaxes are supported.
  75 # In both cases the working directory must be the root of the kernel src.
  76 # 1) O=
  77 # Use "make O=dir/to/store/output/files/"
  78 #
  79 # 2) Set KBUILD_OUTPUT
  80 # Set the environment variable KBUILD_OUTPUT to point to the directory
  81 # where the output files shall be placed.
  82 # export KBUILD_OUTPUT=dir/to/store/output/files/
  83 # make
  84 #
  85 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  86 # variable.
  87
  88
  89 # KBUILD_SRC is set on invocation of make in OBJ directory
  90 # KBUILD_SRC is not intended to be used by the regular user (for now)
  91 ifeq ($(KBUILD_SRC),)
  92
  93 # OK, Make called in directory where kernel src resides
  94 # Do we want to locate output files in a separate directory?
  95 ifeq ("$(origin O)", "command line")
  96   KBUILD_OUTPUT := $(O)
  97 endif
  98
  99 # That's our default target when none is given on the command line
 100 PHONY := _all
 101 _all:
 102
 103 # Cancel implicit rules on top Makefile
 104 $(CURDIR)/Makefile Makefile: ;
 105
 106 ifneq ($(KBUILD_OUTPUT),)
 107 # Invoke a second make in the output directory, passing relevant variables
 108 # check that the output directory actually exists
 109 saved-output := $(KBUILD_OUTPUT)
 110 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 111 $(if $(KBUILD_OUTPUT),, \
 112      $(error output directory "$(saved-output)" does not exist))
 113
 114 PHONY += $(MAKECMDGOALS) sub-make
 115
 116 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 117         $(Q)@:
 118
 119 sub-make: FORCE
 120         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 121         KBUILD_SRC=$(CURDIR) \
 122         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 123         $(filter-out _all sub-make,$(MAKECMDGOALS))
 124
 125 # Leave processing to above invocation of make
 126 skip-makefile := 1
 127 endif # ifneq ($(KBUILD_OUTPUT),)
 128 endif # ifeq ($(KBUILD_SRC),)
 129
 130 # We process the rest of the Makefile if this is the final invocation of make
 131 ifeq ($(skip-makefile),)
 132
 133 # If building an external module we do not care about the all: rule
 134 # but instead _all depend on modules
 135 PHONY += all
 136 ifeq ($(KBUILD_EXTMOD),)
 137 _all: all
 138 else
 139 _all: modules
 140 endif
 141
 142 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 143 objtree         := $(CURDIR)
 144 src             := $(srctree)
 145 obj             := $(objtree)
 146
 147 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 148
 149 export srctree objtree VPATH
 150
 151
 152 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 153 # first, and if a usermode build is happening, the "ARCH=um" on the command
 154 # line overrides the setting of ARCH below.  If a native build is happening,
 155 # then ARCH is assigned, getting whatever value it gets normally, and
 156 # SUBARCH is subsequently ignored.
 157
 158 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 159                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 160                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 161                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 162                                   -e s/sh[234].*/sh/ )
 163
 164 # Cross compiling and selecting different set of gcc/bin-utils
 165 # ---------------------------------------------------------------------------
 166 #
 167 # When performing cross compilation for other architectures ARCH shall be set
 168 # to the target architecture. (See arch/* for the possibilities).
 169 # ARCH can be set during invocation of make:
 170 # make ARCH=ia64
 171 # Another way is to have ARCH set in the environment.
 172 # The default ARCH is the host where make is executed.
 173
 174 # CROSS_COMPILE specify the prefix used for all executables used
 175 # during compilation. Only gcc and related bin-utils executables
 176 # are prefixed with $(CROSS_COMPILE).
 177 # CROSS_COMPILE can be set on the command line
 178 # make CROSS_COMPILE=ia64-linux-
 179 # Alternatively CROSS_COMPILE can be set in the environment.
 180 # Default value for CROSS_COMPILE is not to prefix executables
 181 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 182 export KBUILD_BUILDHOST := $(SUBARCH)
 183 ARCH            ?= $(SUBARCH)
 184 CROSS_COMPILE   ?=
 185
 186 # Architecture as present in compile.h
 187 UTS_MACHINE     := $(ARCH)
 188 SRCARCH         := $(ARCH)
 189
 190 # Additional ARCH settings for x86
 191 ifeq ($(ARCH),i386)
 192         SRCARCH := x86
 193 endif
 194 ifeq ($(ARCH),x86_64)
 195         SRCARCH := x86
 196 endif
 197
 198 # Additional ARCH settings for sparc
 199 ifeq ($(ARCH),sparc64)
 200        SRCARCH := sparc
 201 endif
 202
 203 # Additional ARCH settings for sh
 204 ifeq ($(ARCH),sh64)
 205        SRCARCH := sh
 206 endif
 207
 208 # Where to locate arch specific headers
 209 hdr-arch  := $(SRCARCH)
 210
 211 ifeq ($(ARCH),m68knommu)
 212        hdr-arch  := m68k
 213 endif
 214
 215 KCONFIG_CONFIG  ?= .config
 216
 217 # SHELL used by kbuild
 218 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 219           else if [ -x /bin/bash ]; then echo /bin/bash; \
 220           else echo sh; fi ; fi)
 221
 222 HOSTCC       = gcc
 223 HOSTCXX      = g++
 224 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 225 HOSTCXXFLAGS = -O2
 226
 227 # Decide whether to build built-in, modular, or both.
 228 # Normally, just do built-in.
 229
 230 KBUILD_MODULES :=
 231 KBUILD_BUILTIN := 1
 232
 233 #       If we have only "make modules", don't compile built-in objects.
 234 #       When we're building modules with modversions, we need to consider
 235 #       the built-in objects during the descend as well, in order to
 236 #       make sure the checksums are up to date before we record them.
 237
 238 ifeq ($(MAKECMDGOALS),modules)
 239   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 240 endif
 241
 242 #       If we have "make <whatever> modules", compile modules
 243 #       in addition to whatever we do anyway.
 244 #       Just "make" or "make all" shall build modules as well
 245
 246 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 247   KBUILD_MODULES := 1
 248 endif
 249
 250 ifeq ($(MAKECMDGOALS),)
 251   KBUILD_MODULES := 1
 252 endif
 253
 254 export KBUILD_MODULES KBUILD_BUILTIN
 255 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 256
 257 # Beautify output
 258 # ---------------------------------------------------------------------------
 259 #
 260 # Normally, we echo the whole command before executing it. By making
 261 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 262 # $(quiet) to choose other forms of output instead, e.g.
 263 #
 264 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 265 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 266 #
 267 # If $(quiet) is empty, the whole command will be printed.
 268 # If it is set to "quiet_", only the short version will be printed.
 269 # If it is set to "silent_", nothing will be printed at all, since
 270 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 271 #
 272 # A simple variant is to prefix commands with $(Q) - that's useful
 273 # for commands that shall be hidden in non-verbose mode.
 274 #
 275 #       $(Q)ln $@ :<
 276 #
 277 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 278 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 279
 280 ifeq ($(KBUILD_VERBOSE),1)
 281   quiet =
 282   Q =
 283 else
 284   quiet=quiet_
 285   Q = @
 286 endif
 287
 288 # If the user is running make -s (silent mode), suppress echoing of
 289 # commands
 290
 291 ifneq ($(findstring s,$(MAKEFLAGS)),)
 292   quiet=silent_
 293 endif
 294
 295 export quiet Q KBUILD_VERBOSE
 296
 297
 298 # Look for make include files relative to root of kernel src
 299 MAKEFLAGS += --include-dir=$(srctree)
 300
 301 # We need some generic definitions (do not try to remake the file).
 302 $(srctree)/scripts/Kbuild.include: ;
 303 include $(srctree)/scripts/Kbuild.include
 304
 305 # Make variables (CC, etc...)
 306
 307 AS              = $(CROSS_COMPILE)as
 308 LD              = $(CROSS_COMPILE)ld
 309 CC              = $(CROSS_COMPILE)gcc
 310 CPP             = $(CC) -E
 311 AR              = $(CROSS_COMPILE)ar
 312 NM              = $(CROSS_COMPILE)nm
 313 STRIP           = $(CROSS_COMPILE)strip
 314 OBJCOPY         = $(CROSS_COMPILE)objcopy
 315 OBJDUMP         = $(CROSS_COMPILE)objdump
 316 AWK             = awk
 317 GENKSYMS        = scripts/genksyms/genksyms
 318 DEPMOD          = /sbin/depmod
 319 KALLSYMS        = scripts/kallsyms
 320 PERL            = perl
 321 CHECK           = sparse
 322
 323 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 324                   -Wbitwise -Wno-return-void $(CF)
 325 MODFLAGS        = -DMODULE
 326 CFLAGS_MODULE   = $(MODFLAGS)
 327 AFLAGS_MODULE   = $(MODFLAGS)
 328 LDFLAGS_MODULE  =
 329 CFLAGS_KERNEL   =
 330 AFLAGS_KERNEL   =
 331 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 332
 333
 334 # Use LINUXINCLUDE when you must reference the include/ directory.
 335 # Needed to be compatible with the O= option
 336 LINUXINCLUDE    := -Iinclude \
 337                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 338                    -I$(srctree)/arch/$(hdr-arch)/include               \
 339                    -include include/linux/autoconf.h
 340
 341 KBUILD_CPPFLAGS := -D__KERNEL__
 342
 343 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 344                    -fno-strict-aliasing -fno-common \
 345                    -Werror-implicit-function-declaration \
 346                    -Wno-format-security \
 347                    -fno-delete-null-pointer-checks
 348 KBUILD_AFLAGS   := -D__ASSEMBLY__
 349
 350 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 351 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 352 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 353
 354 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 355 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 356 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 357 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 358
 359 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 360 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 361 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 362
 363 # When compiling out-of-tree modules, put MODVERDIR in the module
 364 # tree rather than in the kernel tree. The kernel tree might
 365 # even be read-only.
 366 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 367
 368 # Files to ignore in find ... statements
 369
 370 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
 371 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 372
 373 # ===========================================================================
 374 # Rules shared between *config targets and build targets
 375
 376 # Basic helpers built in scripts/
 377 PHONY += scripts_basic
 378 scripts_basic:
 379         $(Q)$(MAKE) $(build)=scripts/basic
 380
 381 # To avoid any implicit rule to kick in, define an empty command.
 382 scripts/basic/%: scripts_basic ;
 383
 384 PHONY += outputmakefile
 385 # outputmakefile generates a Makefile in the output directory, if using a
 386 # separate output directory. This allows convenient use of make in the
 387 # output directory.
 388 outputmakefile:
 389 ifneq ($(KBUILD_SRC),)
 390         $(Q)ln -fsn $(srctree) source
 391         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 392             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 393 endif
 394
 395 # To make sure we do not include .config for any of the *config targets
 396 # catch them early, and hand them over to scripts/kconfig/Makefile
 397 # It is allowed to specify more targets when calling make, including
 398 # mixing *config targets and build targets.
 399 # For example 'make oldconfig all'.
 400 # Detect when mixed targets is specified, and make a second invocation
 401 # of make so .config is not included in this case either (for *config).
 402
 403 no-dot-config-targets := clean mrproper distclean \
 404                          cscope TAGS tags help %docs check% \
 405                          include/linux/version.h headers_% \
 406                          kernelrelease kernelversion
 407
 408 config-targets := 0
 409 mixed-targets  := 0
 410 dot-config     := 1
 411
 412 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 413         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 414                 dot-config := 0
 415         endif
 416 endif
 417
 418 ifeq ($(KBUILD_EXTMOD),)
 419         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 420                 config-targets := 1
 421                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 422                         mixed-targets := 1
 423                 endif
 424         endif
 425 endif
 426
 427 ifeq ($(mixed-targets),1)
 428 # ===========================================================================
 429 # We're called with mixed targets (*config and build targets).
 430 # Handle them one by one.
 431
 432 %:: FORCE
 433         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 434
 435 else
 436 ifeq ($(config-targets),1)
 437 # ===========================================================================
 438 # *config targets only - make sure prerequisites are updated, and descend
 439 # in scripts/kconfig to make the *config target
 440
 441 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 442 # KBUILD_DEFCONFIG may point out an alternative default configuration
 443 # used for 'make defconfig'
 444 include $(srctree)/arch/$(SRCARCH)/Makefile
 445 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 446
 447 config: scripts_basic outputmakefile FORCE
 448         $(Q)mkdir -p include/linux include/config
 449         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 450
 451 %config: scripts_basic outputmakefile FORCE
 452         $(Q)mkdir -p include/linux include/config
 453         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 454
 455 else
 456 # ===========================================================================
 457 # Build targets only - this includes vmlinux, arch specific targets, clean
 458 # targets and others. In general all targets except *config targets.
 459
 460 ifeq ($(KBUILD_EXTMOD),)
 461 # Additional helpers built in scripts/
 462 # Carefully list dependencies so we do not try to build scripts twice
 463 # in parallel
 464 PHONY += scripts
 465 scripts: scripts_basic include/config/auto.conf
 466         $(Q)$(MAKE) $(build)=$(@)
 467
 468 # Objects we will link into vmlinux / subdirs we need to visit
 469 init-y          := init/
 470 drivers-y       := drivers/ sound/ firmware/
 471 net-y           := net/
 472 libs-y          := lib/
 473 core-y          := usr/
 474 endif # KBUILD_EXTMOD
 475
 476 ifeq ($(dot-config),1)
 477 # Read in config
 478 -include include/config/auto.conf
 479
 480 ifeq ($(KBUILD_EXTMOD),)
 481 # Read in dependencies to all Kconfig* files, make sure to run
 482 # oldconfig if changes are detected.
 483 -include include/config/auto.conf.cmd
 484
 485 # To avoid any implicit rule to kick in, define an empty command
 486 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 487
 488 # If .config is newer than include/config/auto.conf, someone tinkered
 489 # with it and forgot to run make oldconfig.
 490 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 491 # we execute the config step to be sure to catch updated Kconfig files
 492 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 493         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 494 else
 495 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 496 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 497 PHONY += include/config/auto.conf
 498
 499 include/config/auto.conf:
 500         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 501         echo;                                                           \
 502         echo "  ERROR: Kernel configuration is invalid.";               \
 503         echo "         include/linux/autoconf.h or $@ are missing.";    \
 504         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 505         echo;                                                           \
 506         /bin/false)
 507
 508 endif # KBUILD_EXTMOD
 509
 510 else
 511 # Dummy target needed, because used as prerequisite
 512 include/config/auto.conf: ;
 513 endif # $(dot-config)
 514
 515 # The all: target is the default when no target is given on the
 516 # command line.
 517 # This allow a user to issue only 'make' to build a kernel including modules
 518 # Defaults vmlinux but it is usually overridden in the arch makefile
 519 all: vmlinux
 520
 521 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 522 KBUILD_CFLAGS   += -Os
 523 else
 524 KBUILD_CFLAGS   += -O2
 525 endif
 526
 527 include $(srctree)/arch/$(SRCARCH)/Makefile
 528
 529 ifneq ($(CONFIG_FRAME_WARN),0)
 530 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 531 endif
 532
 533 # Force gcc to behave correct even for buggy distributions
 534 ifndef CONFIG_CC_STACKPROTECTOR
 535 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 536 endif
 537
 538 ifdef CONFIG_FRAME_POINTER
 539 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 540 else
 541 KBUILD_CFLAGS   += -fomit-frame-pointer
 542 endif
 543
 544 ifdef CONFIG_DEBUG_INFO
 545 KBUILD_CFLAGS   += -g
 546 KBUILD_AFLAGS   += -gdwarf-2
 547 endif
 548
 549 ifdef CONFIG_FUNCTION_TRACER
 550 KBUILD_CFLAGS   += -pg
 551 endif
 552
 553 # We trigger additional mismatches with less inlining
 554 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 555 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 556 endif
 557
 558 # arch Makefile may override CC so keep this after arch Makefile is included
 559 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 560 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 561
 562 # warn about C99 declaration after statement
 563 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 564
 565 # disable pointer signed / unsigned warnings in gcc 4.0
 566 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 567
 568 # disable invalid "can't wrap" optimizations for signed / pointers
 569 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 570
 571 # revert to pre-gcc-4.4 behaviour of .eh_frame
 572 KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 573
 574 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 575 # But warn user when we do so
 576 warn-assign = \
 577 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 578
 579 ifneq ($(KCPPFLAGS),)
 580         $(call warn-assign,CPPFLAGS)
 581         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 582 endif
 583 ifneq ($(KAFLAGS),)
 584         $(call warn-assign,AFLAGS)
 585         KBUILD_AFLAGS += $(KAFLAGS)
 586 endif
 587 ifneq ($(KCFLAGS),)
 588         $(call warn-assign,CFLAGS)
 589         KBUILD_CFLAGS += $(KCFLAGS)
 590 endif
 591
 592 # Use --build-id when available.
 593 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 594                               $(call ld-option, -Wl$(comma)--build-id,))
 595 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 596 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 597
 598 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 599 LDFLAGS_vmlinux += -X
 600 endif
 601
 602 # Default kernel image to build when no specific target is given.
 603 # KBUILD_IMAGE may be overruled on the command line or
 604 # set in the environment
 605 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 606 # this default value
 607 export KBUILD_IMAGE ?= vmlinux
 608
 609 #
 610 # INSTALL_PATH specifies where to place the updated kernel and system map
 611 # images. Default is /boot, but you can set it to other values
 612 export  INSTALL_PATH ?= /boot
 613
 614 #
 615 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 616 # relocations required by build roots.  This is not defined in the
 617 # makefile but the argument can be passed to make if needed.
 618 #
 619
 620 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 621 export MODLIB
 622
 623 #
 624 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 625 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 626 #  the default option --strip-debug will be used.  Otherwise,
 627 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 628
 629 ifdef INSTALL_MOD_STRIP
 630 ifeq ($(INSTALL_MOD_STRIP),1)
 631 mod_strip_cmd = $(STRIP) --strip-debug
 632 else
 633 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 634 endif # INSTALL_MOD_STRIP=1
 635 else
 636 mod_strip_cmd = true
 637 endif # INSTALL_MOD_STRIP
 638 export mod_strip_cmd
 639
 640
 641 ifeq ($(KBUILD_EXTMOD),)
 642 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 643
 644 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 645                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 646                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 647
 648 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 649                      $(init-n) $(init-) \
 650                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 651                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 652
 653 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 654 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 655 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 656 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 657 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 658 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 659 libs-y          := $(libs-y1) $(libs-y2)
 660
 661 # Build vmlinux
 662 # ---------------------------------------------------------------------------
 663 # vmlinux is built from the objects selected by $(vmlinux-init) and
 664 # $(vmlinux-main). Most are built-in.o files from top-level directories
 665 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 666 # Ordering when linking is important, and $(vmlinux-init) must be first.
 667 #
 668 # vmlinux
 669 #   ^
 670 #   |
 671 #   +-< $(vmlinux-init)
 672 #   |   +--< init/version.o + more
 673 #   |
 674 #   +--< $(vmlinux-main)
 675 #   |    +--< driver/built-in.o mm/built-in.o + more
 676 #   |
 677 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 678 #
 679 # vmlinux version (uname -v) cannot be updated during normal
 680 # descending-into-subdirs phase since we do not yet know if we need to
 681 # update vmlinux.
 682 # Therefore this step is delayed until just before final link of vmlinux -
 683 # except in the kallsyms case where it is done just before adding the
 684 # symbols to the kernel.
 685 #
 686 # System.map is generated to document addresses of all kernel symbols
 687
 688 vmlinux-init := $(head-y) $(init-y)
 689 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 690 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 691 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 692 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 693
 694 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 695 # May be overridden by arch/$(ARCH)/Makefile
 696 quiet_cmd_vmlinux__ ?= LD      $@
 697       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 698       -T $(vmlinux-lds) $(vmlinux-init)                          \
 699       --start-group $(vmlinux-main) --end-group                  \
 700       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 701
 702 # Generate new vmlinux version
 703 quiet_cmd_vmlinux_version = GEN     .version
 704       cmd_vmlinux_version = set -e;                     \
 705         if [ ! -r .version ]; then                      \
 706           rm -f .version;                               \
 707           echo 1 >.version;                             \
 708         else                                            \
 709           mv .version .old_version;                     \
 710           expr 0$$(cat .old_version) + 1 >.version;     \
 711         fi;                                             \
 712         $(MAKE) $(build)=init
 713
 714 # Generate System.map
 715 quiet_cmd_sysmap = SYSMAP
 716       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 717
 718 # Link of vmlinux
 719 # If CONFIG_KALLSYMS is set .version is already updated
 720 # Generate System.map and verify that the content is consistent
 721 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 722 # First command is ':' to allow us to use + in front of the rule
 723 define rule_vmlinux__
 724         :
 725         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 726
 727         $(call cmd,vmlinux__)
 728         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 729
 730         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 731           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 732         $(cmd_sysmap) $@ System.map;                                         \
 733         if [ $$? -ne 0 ]; then                                               \
 734                 rm -f $@;                                                    \
 735                 /bin/false;                                                  \
 736         fi;
 737         $(verify_kallsyms)
 738 endef
 739
 740
 741 ifdef CONFIG_KALLSYMS
 742 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 743 # It's a three stage process:
 744 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 745 #   empty
 746 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 747 #   the right size - vmlinux version (uname -v) is updated during this step
 748 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 749 #   but due to the added section, some addresses have shifted.
 750 #   From here, we generate a correct .tmp_kallsyms2.o
 751 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 752 # o Verify that the System.map from vmlinux matches the map from
 753 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 754 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 755 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 756 #   temporary bypass to allow the kernel to be built while the
 757 #   maintainers work out what went wrong with kallsyms.
 758
 759 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 760 last_kallsyms := 3
 761 else
 762 last_kallsyms := 2
 763 endif
 764
 765 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 766
 767 define verify_kallsyms
 768         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 769           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 770           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 771         $(Q)cmp -s System.map .tmp_System.map ||                             \
 772                 (echo Inconsistent kallsyms data;                            \
 773                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 774                  rm .tmp_kallsyms* ; /bin/false )
 775 endef
 776
 777 # Update vmlinux version before link
 778 # Use + in front of this rule to silent warning about make -j1
 779 # First command is ':' to allow us to use + in front of this rule
 780 cmd_ksym_ld = $(cmd_vmlinux__)
 781 define rule_ksym_ld
 782         :
 783         +$(call cmd,vmlinux_version)
 784         $(call cmd,vmlinux__)
 785         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 786 endef
 787
 788 # Generate .S file with all kernel symbols
 789 quiet_cmd_kallsyms = KSYM    $@
 790       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 791                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 792
 793 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 794         $(call if_changed_dep,as_o_S)
 795
 796 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 797         $(call cmd,kallsyms)
 798
 799 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 800 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 801         $(call if_changed_rule,ksym_ld)
 802
 803 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 804         $(call if_changed,vmlinux__)
 805
 806 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 807         $(call if_changed,vmlinux__)
 808
 809 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 810 $(KALLSYMS): scripts ;
 811
 812 # Generate some data for debugging strange kallsyms problems
 813 debug_kallsyms: .tmp_map$(last_kallsyms)
 814
 815 .tmp_map%: .tmp_vmlinux% FORCE
 816         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 817
 818 .tmp_map3: .tmp_map2
 819
 820 .tmp_map2: .tmp_map1
 821
 822 endif # ifdef CONFIG_KALLSYMS
 823
 824 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 825 # relevant sections renamed as per the linker script.
 826 quiet_cmd_vmlinux-modpost = LD      $@
 827       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 828          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 829          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 830 define rule_vmlinux-modpost
 831         :
 832         +$(call cmd,vmlinux-modpost)
 833         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 834         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 835 endef
 836
 837 # vmlinux image - including updated kernel symbols
 838 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 839 ifdef CONFIG_HEADERS_CHECK
 840         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 841 endif
 842 ifdef CONFIG_SAMPLES
 843         $(Q)$(MAKE) $(build)=samples
 844 endif
 845 ifdef CONFIG_BUILD_DOCSRC
 846         $(Q)$(MAKE) $(build)=Documentation
 847 endif
 848         $(call vmlinux-modpost)
 849         $(call if_changed_rule,vmlinux__)
 850         $(Q)rm -f .old_version
 851
 852 # build vmlinux.o first to catch section mismatch errors early
 853 ifdef CONFIG_KALLSYMS
 854 .tmp_vmlinux1: vmlinux.o
 855 endif
 856
 857 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 858 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 859         $(call if_changed_rule,vmlinux-modpost)
 860
 861 # The actual objects are generated when descending,
 862 # make sure no implicit rule kicks in
 863 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 864
 865 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 866 # Preset locale variables to speed up the build process. Limit locale
 867 # tweaks to this spot to avoid wrong language settings when running
 868 # make menuconfig etc.
 869 # Error messages still appears in the original language
 870
 871 PHONY += $(vmlinux-dirs)
 872 $(vmlinux-dirs): prepare scripts
 873         $(Q)$(MAKE) $(build)=$@
 874
 875 # Build the kernel release string
 876 #
 877 # The KERNELRELEASE value built here is stored in the file
 878 # include/config/kernel.release, and is used when executing several
 879 # make targets, such as "make install" or "make modules_install."
 880 #
 881 # The eventual kernel release string consists of the following fields,
 882 # shown in a hierarchical format to show how smaller parts are concatenated
 883 # to form the larger and final value, with values coming from places like
 884 # the Makefile, kernel config options, make command line options and/or
 885 # SCM tag information.
 886 #
 887 #       $(KERNELVERSION)
 888 #         $(VERSION)                    eg, 2
 889 #         $(PATCHLEVEL)                 eg, 6
 890 #         $(SUBLEVEL)                   eg, 18
 891 #         $(EXTRAVERSION)               eg, -rc6
 892 #       $(localver-full)
 893 #         $(localver)
 894 #           localversion*               (files without backups, containing '~')
 895 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 896 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 897 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 898 #           $(LOCALVERSION)             (from make command line if provided)
 899 #
 900 #  Note how the final $(localver-auto) string is included *only* if the
 901 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 902 # moment, only git is supported but other SCMs can edit the script
 903 # scripts/setlocalversion and add the appropriate checks as needed.
 904
 905 pattern = ".*/localversion[^~]*"
 906 string  = $(shell cat /dev/null \
 907            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 908
 909 localver = $(subst $(space),, $(string) \
 910                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 911
 912 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 913 # and if the SCM is know a tag from the SCM is appended.
 914 # The appended tag is determined by the SCM used.
 915 #
 916 # .scmversion is used when generating rpm packages so we do not loose
 917 # the version information from the SCM when we do the build of the kernel
 918 # from the copied source
 919 ifdef CONFIG_LOCALVERSION_AUTO
 920
 921 ifeq ($(wildcard .scmversion),)
 922         _localver-auto = $(shell $(CONFIG_SHELL) \
 923                          $(srctree)/scripts/setlocalversion $(srctree))
 924 else
 925         _localver-auto = $(shell cat .scmversion 2> /dev/null)
 926 endif
 927
 928         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 929 endif
 930
 931 localver-full = $(localver)$(localver-auto)
 932
 933 # Store (new) KERNELRELASE string in include/config/kernel.release
 934 kernelrelease = $(KERNELVERSION)$(localver-full)
 935 include/config/kernel.release: include/config/auto.conf FORCE
 936         $(Q)rm -f $@
 937         $(Q)echo $(kernelrelease) > $@
 938
 939
 940 # Things we need to do before we recursively start building the kernel
 941 # or the modules are listed in "prepare".
 942 # A multi level approach is used. prepareN is processed before prepareN-1.
 943 # archprepare is used in arch Makefiles and when processed asm symlink,
 944 # version.h and scripts_basic is processed / created.
 945
 946 # Listed in dependency order
 947 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 948
 949 # prepare3 is used to check if we are building in a separate output directory,
 950 # and if so do:
 951 # 1) Check that make has not been executed in the kernel src $(srctree)
 952 # 2) Create the include2 directory, used for the second asm symlink
 953 prepare3: include/config/kernel.release
 954 ifneq ($(KBUILD_SRC),)
 955         @$(kecho) '  Using $(srctree) as source for kernel'
 956         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 957                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 958                 echo "  in the '$(srctree)' directory.";\
 959                 /bin/false; \
 960         fi;
 961         $(Q)if [ ! -d include2 ]; then                                  \
 962             mkdir -p include2;                                          \
 963             ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 964         fi
 965 endif
 966
 967 # prepare2 creates a makefile if using a separate output directory
 968 prepare2: prepare3 outputmakefile
 969
 970 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 971                    include/asm include/config/auto.conf
 972         $(cmd_crmodverdir)
 973
 974 archprepare: prepare1 scripts_basic
 975
 976 prepare0: archprepare FORCE
 977         $(Q)$(MAKE) $(build)=.
 978         $(Q)$(MAKE) $(build)=. missing-syscalls
 979
 980 # All the preparing..
 981 prepare: prepare0
 982
 983 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 984 # done in arch/$(ARCH)/kernel/Makefile
 985
 986 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 987
 988 # The asm symlink changes when $(ARCH) changes.
 989 # Detect this and ask user to run make mrproper
 990 # If asm is a stale symlink (point to dir that does not exist) remove it
 991 define check-symlink
 992         set -e;                                                            \
 993         if [ -L include/asm ]; then                                        \
 994                 asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
 995                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
 996                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 997                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 998                         exit 1;                                            \
 999                 fi;                                                        \
1000                 test -e $$asmlink || rm include/asm;                       \
1001         elif [ -d include/asm ]; then                                      \
1002                 echo "ERROR: $@ is a directory but a symlink was expected";\
1003                 exit 1;                                                    \
1004         fi
1005 endef
1006
1007 # We create the target directory of the symlink if it does
1008 # not exist so the test in check-symlink works and we have a
1009 # directory for generated filesas used by some architectures.
1010 define create-symlink
1011         if [ ! -L include/asm ]; then                                      \
1012                         $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1013                         if [ ! -d include/asm-$(SRCARCH) ]; then           \
1014                                 mkdir -p include/asm-$(SRCARCH);           \
1015                         fi;                                                \
1016                         ln -fsn asm-$(SRCARCH) $@;                         \
1017         fi
1018 endef
1019
1020 include/asm: FORCE
1021         $(Q)$(check-symlink)
1022         $(Q)$(create-symlink)
1023
1024 # Generate some files
1025 # ---------------------------------------------------------------------------
1026
1027 # KERNELRELEASE can change from a few different places, meaning version.h
1028 # needs to be updated, so this check is forced on all builds
1029
1030 uts_len := 64
1031 define filechk_utsrelease.h
1032         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1033           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1034           exit 1;                                                         \
1035         fi;                                                               \
1036         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1037 endef
1038
1039 define filechk_version.h
1040         (echo \#define LINUX_VERSION_CODE $(shell                             \
1041         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1042         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1043 endef
1044
1045 include/linux/version.h: $(srctree)/Makefile FORCE
1046         $(call filechk,version.h)
1047
1048 include/linux/utsrelease.h: include/config/kernel.release FORCE
1049         $(call filechk,utsrelease.h)
1050
1051 PHONY += headerdep
1052 headerdep:
1053         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1054
1055 # ---------------------------------------------------------------------------
1056
1057 PHONY += depend dep
1058 depend dep:
1059         @echo '*** Warning: make $@ is unnecessary now.'
1060
1061 # ---------------------------------------------------------------------------
1062 # Firmware install
1063 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1064 export INSTALL_FW_PATH
1065
1066 PHONY += firmware_install
1067 firmware_install: FORCE
1068         @mkdir -p $(objtree)/firmware
1069         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1070
1071 # ---------------------------------------------------------------------------
1072 # Kernel headers
1073
1074 #Default location for installed headers
1075 export INSTALL_HDR_PATH = $(objtree)/usr
1076
1077 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1078 # Find out where the Kbuild file is located to support
1079 # arch/$(ARCH)/include/asm
1080 hdr-dir = $(strip                                                         \
1081           $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1082                arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1083
1084 # If we do an all arch process set dst to asm-$(hdr-arch)
1085 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1086
1087 PHONY += __headers
1088 __headers: include/linux/version.h scripts_basic FORCE
1089         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1090
1091 PHONY += headers_install_all
1092 headers_install_all:
1093         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1094
1095 PHONY += headers_install
1096 headers_install: __headers
1097         $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1098         $(error Headers not exportable for the $(SRCARCH) architecture))
1099         $(Q)$(MAKE) $(hdr-inst)=include
1100         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1101
1102 PHONY += headers_check_all
1103 headers_check_all: headers_install_all
1104         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1105
1106 PHONY += headers_check
1107 headers_check: headers_install
1108         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1109         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1110
1111 # ---------------------------------------------------------------------------
1112 # Modules
1113
1114 ifdef CONFIG_MODULES
1115
1116 # By default, build modules as well
1117
1118 all: modules
1119
1120 #       Build modules
1121 #
1122 #       A module can be listed more than once in obj-m resulting in
1123 #       duplicate lines in modules.order files.  Those are removed
1124 #       using awk while concatenating to the final file.
1125
1126 PHONY += modules
1127 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1128         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1129         @$(kecho) '  Building modules, stage 2.';
1130         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1131         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1132
1133
1134 # Target to prepare building external modules
1135 PHONY += modules_prepare
1136 modules_prepare: prepare scripts
1137
1138 # Target to install modules
1139 PHONY += modules_install
1140 modules_install: _modinst_ _modinst_post
1141
1142 PHONY += _modinst_
1143 _modinst_:
1144         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1145                 echo "Warning: you may need to install module-init-tools"; \
1146                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1147                 sleep 1; \
1148         fi
1149         @rm -rf $(MODLIB)/kernel
1150         @rm -f $(MODLIB)/source
1151         @mkdir -p $(MODLIB)/kernel
1152         @ln -s $(srctree) $(MODLIB)/source
1153         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1154                 rm -f $(MODLIB)/build ; \
1155                 ln -s $(objtree) $(MODLIB)/build ; \
1156         fi
1157         @cp -f $(objtree)/modules.order $(MODLIB)/
1158         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1159
1160 # This depmod is only for convenience to give the initial
1161 # boot a modules.dep even before / is mounted read-write.  However the
1162 # boot script depmod is the master version.
1163 PHONY += _modinst_post
1164 _modinst_post: _modinst_
1165         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1166         $(call cmd,depmod)
1167
1168 else # CONFIG_MODULES
1169
1170 # Modules not configured
1171 # ---------------------------------------------------------------------------
1172
1173 modules modules_install: FORCE
1174         @echo
1175         @echo "The present kernel configuration has modules disabled."
1176         @echo "Type 'make config' and enable loadable module support."
1177         @echo "Then build a kernel with module support enabled."
1178         @echo
1179         @exit 1
1180
1181 endif # CONFIG_MODULES
1182
1183 ###
1184 # Cleaning is done on three levels.
1185 # make clean     Delete most generated files
1186 #                Leave enough to build external modules
1187 # make mrproper  Delete the current configuration, and all generated files
1188 # make distclean Remove editor backup files, patch leftover files and the like
1189
1190 # Directories & files removed with 'make clean'
1191 CLEAN_DIRS  += $(MODVERDIR)
1192 CLEAN_FILES +=  vmlinux System.map \
1193                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1194
1195 # Directories & files removed with 'make mrproper'
1196 MRPROPER_DIRS  += include/config include2 usr/include include/generated
1197 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1198                   include/linux/autoconf.h include/linux/version.h      \
1199                   include/linux/utsrelease.h                            \
1200                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1201                   Module.symvers Module.markers tags TAGS cscope*
1202
1203 # clean - Delete most, but leave enough to build external modules
1204 #
1205 clean: rm-dirs  := $(CLEAN_DIRS)
1206 clean: rm-files := $(CLEAN_FILES)
1207 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1208
1209 PHONY += $(clean-dirs) clean archclean
1210 $(clean-dirs):
1211         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1212
1213 clean: archclean $(clean-dirs)
1214         $(call cmd,rmdirs)
1215         $(call cmd,rmfiles)
1216         @find . $(RCS_FIND_IGNORE) \
1217                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1218                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1219                 -o -name '*.symtypes' -o -name 'modules.order' \
1220                 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \
1221                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1222
1223 # mrproper - Delete all generated files, including .config
1224 #
1225 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1226 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1227 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1228
1229 PHONY += $(mrproper-dirs) mrproper archmrproper
1230 $(mrproper-dirs):
1231         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1232
1233 mrproper: clean archmrproper $(mrproper-dirs)
1234         $(call cmd,rmdirs)
1235         $(call cmd,rmfiles)
1236
1237 # distclean
1238 #
1239 PHONY += distclean
1240
1241 distclean: mrproper
1242         @find $(srctree) $(RCS_FIND_IGNORE) \
1243                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1244                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1245                 -o -name '.*.rej' -o -size 0 \
1246                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1247                 -type f -print | xargs rm -f
1248
1249
1250 # Packaging of the kernel to various formats
1251 # ---------------------------------------------------------------------------
1252 # rpm target kept for backward compatibility
1253 package-dir     := $(srctree)/scripts/package
1254
1255 %pkg: include/config/kernel.release FORCE
1256         $(Q)$(MAKE) $(build)=$(package-dir) $@
1257 rpm: include/config/kernel.release FORCE
1258         $(Q)$(MAKE) $(build)=$(package-dir) $@
1259
1260
1261 # Brief documentation of the typical targets used
1262 # ---------------------------------------------------------------------------
1263
1264 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1265 boards := $(notdir $(boards))
1266 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1267 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1268
1269 help:
1270         @echo  'Cleaning targets:'
1271         @echo  '  clean           - Remove most generated files but keep the config and'
1272         @echo  '                    enough build support to build external modules'
1273         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1274         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1275         @echo  ''
1276         @echo  'Configuration targets:'
1277         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1278         @echo  ''
1279         @echo  'Other generic targets:'
1280         @echo  '  all             - Build all targets marked with [*]'
1281         @echo  '* vmlinux         - Build the bare kernel'
1282         @echo  '* modules         - Build all modules'
1283         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1284         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1285         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1286         @echo  '  dir/            - Build all files in dir and below'
1287         @echo  '  dir/file.[ois]  - Build specified target only'
1288         @echo  '  dir/file.ko     - Build module including final link'
1289         @echo  '  modules_prepare - Set up for building external modules'
1290         @echo  '  tags/TAGS       - Generate tags file for editors'
1291         @echo  '  cscope          - Generate cscope index'
1292         @echo  '  kernelrelease   - Output the release version string'
1293         @echo  '  kernelversion   - Output the version stored in Makefile'
1294         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1295          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1296          echo  ''
1297         @echo  'Static analysers'
1298         @echo  '  checkstack      - Generate a list of stack hogs'
1299         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1300         @echo  '  versioncheck    - Sanity check on version.h usage'
1301         @echo  '  includecheck    - Check for duplicate included header files'
1302         @echo  '  export_report   - List the usages of all exported symbols'
1303         @echo  '  headers_check   - Sanity check on exported headers'
1304         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1305          echo  ''
1306         @echo  'Kernel packaging:'
1307         @$(MAKE) $(build)=$(package-dir) help
1308         @echo  ''
1309         @echo  'Documentation targets:'
1310         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1311         @echo  ''
1312         @echo  'Architecture specific targets ($(SRCARCH)):'
1313         @$(if $(archhelp),$(archhelp),\
1314                 echo '  No architecture specific help defined for $(SRCARCH)')
1315         @echo  ''
1316         @$(if $(boards), \
1317                 $(foreach b, $(boards), \
1318                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1319                 echo '')
1320         @$(if $(board-dirs), \
1321                 $(foreach b, $(board-dirs), \
1322                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1323                 printf "  %-16s - Show all of the above\\n" help-boards; \
1324                 echo '')
1325
1326         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1327         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1328         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1329         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1330         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1331         @echo  ''
1332         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1333         @echo  'For further info see the ./README file'
1334
1335
1336 help-board-dirs := $(addprefix help-,$(board-dirs))
1337
1338 help-boards: $(help-board-dirs)
1339
1340 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1341
1342 $(help-board-dirs): help-%:
1343         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1344         @$(if $(boards-per-dir), \
1345                 $(foreach b, $(boards-per-dir), \
1346                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1347                 echo '')
1348
1349
1350 # Documentation targets
1351 # ---------------------------------------------------------------------------
1352 %docs: scripts_basic FORCE
1353         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1354
1355 else # KBUILD_EXTMOD
1356
1357 ###
1358 # External module support.
1359 # When building external modules the kernel used as basis is considered
1360 # read-only, and no consistency checks are made and the make
1361 # system is not used on the basis kernel. If updates are required
1362 # in the basis kernel ordinary make commands (without M=...) must
1363 # be used.
1364 #
1365 # The following are the only valid targets when building external
1366 # modules.
1367 # make M=dir clean     Delete all automatically generated files
1368 # make M=dir modules   Make all modules in specified dir
1369 # make M=dir           Same as 'make M=dir modules'
1370 # make M=dir modules_install
1371 #                      Install the modules built in the module directory
1372 #                      Assumes install directory is already created
1373
1374 # We are always building modules
1375 KBUILD_MODULES := 1
1376 PHONY += crmodverdir
1377 crmodverdir:
1378         $(cmd_crmodverdir)
1379
1380 PHONY += $(objtree)/Module.symvers
1381 $(objtree)/Module.symvers:
1382         @test -e $(objtree)/Module.symvers || ( \
1383         echo; \
1384         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1385         echo "           is missing; modules will have no dependencies and modversions."; \
1386         echo )
1387
1388 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1389 PHONY += $(module-dirs) modules
1390 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1391         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1392
1393 modules: $(module-dirs)
1394         @$(kecho) '  Building modules, stage 2.';
1395         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1396
1397 PHONY += modules_install
1398 modules_install: _emodinst_ _emodinst_post
1399
1400 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1401 PHONY += _emodinst_
1402 _emodinst_:
1403         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1404         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1405
1406 PHONY += _emodinst_post
1407 _emodinst_post: _emodinst_
1408         $(call cmd,depmod)
1409
1410 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1411
1412 PHONY += $(clean-dirs) clean
1413 $(clean-dirs):
1414         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1415
1416 clean:  rm-dirs := $(MODVERDIR)
1417 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1418                    $(KBUILD_EXTMOD)/Module.markers \
1419                    $(KBUILD_EXTMOD)/modules.order
1420 clean: $(clean-dirs)
1421         $(call cmd,rmdirs)
1422         $(call cmd,rmfiles)
1423         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1424                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1425                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1426                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1427
1428 help:
1429         @echo  '  Building external modules.'
1430         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1431         @echo  ''
1432         @echo  '  modules         - default target, build the module(s)'
1433         @echo  '  modules_install - install the module'
1434         @echo  '  clean           - remove generated files in module directory only'
1435         @echo  ''
1436
1437 # Dummies...
1438 PHONY += prepare scripts
1439 prepare: ;
1440 scripts: ;
1441 endif # KBUILD_EXTMOD
1442
1443 # Generate tags for editors
1444 # ---------------------------------------------------------------------------
1445 quiet_cmd_tags = GEN     $@
1446       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1447
1448 tags TAGS cscope: FORCE
1449         $(call cmd,tags)
1450
1451 # Scripts to check various things for consistency
1452 # ---------------------------------------------------------------------------
1453
1454 includecheck:
1455         find * $(RCS_FIND_IGNORE) \
1456                 -name '*.[hcS]' -type f -print | sort \
1457                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1458
1459 versioncheck:
1460         find * $(RCS_FIND_IGNORE) \
1461                 -name '*.[hcS]' -type f -print | sort \
1462                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1463
1464 namespacecheck:
1465         $(PERL) $(srctree)/scripts/namespace.pl
1466
1467 export_report:
1468         $(PERL) $(srctree)/scripts/export_report.pl
1469
1470 endif #ifeq ($(config-targets),1)
1471 endif #ifeq ($(mixed-targets),1)
1472
1473 PHONY += checkstack kernelrelease kernelversion
1474
1475 # UML needs a little special treatment here.  It wants to use the host
1476 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1477 # else wants $(ARCH), including people doing cross-builds, which means
1478 # that $(SUBARCH) doesn't work here.
1479 ifeq ($(ARCH), um)
1480 CHECKSTACK_ARCH := $(SUBARCH)
1481 else
1482 CHECKSTACK_ARCH := $(ARCH)
1483 endif
1484 checkstack:
1485         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1486         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1487
1488 kernelrelease:
1489         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1490         $(error kernelrelease not valid - run 'make prepare' to update it))
1491 kernelversion:
1492         @echo $(KERNELVERSION)
1493
1494 # Single targets
1495 # ---------------------------------------------------------------------------
1496 # Single targets are compatible with:
1497 # - build with mixed source and output
1498 # - build with separate output dir 'make O=...'
1499 # - external modules
1500 #
1501 #  target-dir => where to store outputfile
1502 #  build-dir  => directory in kernel source tree to use
1503
1504 ifeq ($(KBUILD_EXTMOD),)
1505         build-dir  = $(patsubst %/,%,$(dir $@))
1506         target-dir = $(dir $@)
1507 else
1508         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1509         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1510         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1511 endif
1512
1513 %.s: %.c prepare scripts FORCE
1514         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1515 %.i: %.c prepare scripts FORCE
1516         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1517 %.o: %.c prepare scripts FORCE
1518         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1519 %.lst: %.c prepare scripts FORCE
1520         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1521 %.s: %.S prepare scripts FORCE
1522         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523 %.o: %.S prepare scripts FORCE
1524         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525 %.symtypes: %.c prepare scripts FORCE
1526         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527
1528 # Modules
1529 /: prepare scripts FORCE
1530         $(cmd_crmodverdir)
1531         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1532         $(build)=$(build-dir)
1533 %/: prepare scripts FORCE
1534         $(cmd_crmodverdir)
1535         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1536         $(build)=$(build-dir)
1537 %.ko: prepare scripts FORCE
1538         $(cmd_crmodverdir)
1539         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1540         $(build)=$(build-dir) $(@:.ko=.o)
1541         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1542
1543 # FIXME Should go into a make.lib or something
1544 # ===========================================================================
1545
1546 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1547       cmd_rmdirs = rm -rf $(rm-dirs)
1548
1549 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1550       cmd_rmfiles = rm -f $(rm-files)
1551
1552 # Run depmod only if we have System.map and depmod is executable
1553 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1554       cmd_depmod = \
1555         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1556                 $(DEPMOD) -ae -F System.map                                     \
1557                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1558                 $(KERNELRELEASE);                                               \
1559         fi
1560
1561 # Create temporary dir for module support files
1562 # clean it up only when building all modules
1563 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1564                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1565
1566 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1567           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1568           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1569
1570 quiet_cmd_as_o_S = AS      $@
1571 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1572
1573 # read all saved command lines
1574
1575 targets := $(wildcard $(sort $(targets)))
1576 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1577
1578 ifneq ($(cmd_files),)
1579   $(cmd_files): ;       # Do not try to update included dependency files
1580   include $(cmd_files)
1581 endif
1582
1583 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1584 # Usage:
1585 # $(Q)$(MAKE) $(clean)=dir
1586 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1587
1588 endif   # skip-makefile
1589
1590 PHONY += FORCE
1591 FORCE:
1592
1593 # Declare the contents of the .PHONY variable as phony.  We keep that
1594 # information in a variable so we can use it in if_changed and friends.
1595 .PHONY: $(PHONY)