Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 30
   4 EXTRAVERSION =
   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 # Add custom flags here to avoid conflict with updates
  20 EXTRAVERSION := $(EXTRAVERSION)-omap1
  21
  22 # We are using a recursive build, so we need to do a little thinking
  23 # to get the ordering right.
  24 #
  25 # Most importantly: sub-Makefiles should only ever modify files in
  26 # their own directory. If in some directory we have a dependency on
  27 # a file in another dir (which doesn't happen often, but it's often
  28 # unavoidable when linking the built-in.o targets which finally
  29 # turn into vmlinux), we will call a sub make in that other dir, and
  30 # after that we are sure that everything which is in that other dir
  31 # is now up to date.
  32 #
  33 # The only cases where we need to modify files which have global
  34 # effects are thus separated out and done before the recursive
  35 # descending is started. They are now explicitly listed as the
  36 # prepare rule.
  37
  38 # To put more focus on warnings, be less verbose as default
  39 # Use 'make V=1' to see the full commands
  40
  41 ifdef V
  42   ifeq ("$(origin V)", "command line")
  43     KBUILD_VERBOSE = $(V)
  44   endif
  45 endif
  46 ifndef KBUILD_VERBOSE
  47   KBUILD_VERBOSE = 0
  48 endif
  49
  50 # Call a source code checker (by default, "sparse") as part of the
  51 # C compilation.
  52 #
  53 # Use 'make C=1' to enable checking of only re-compiled files.
  54 # Use 'make C=2' to enable checking of *all* source files, regardless
  55 # of whether they are re-compiled or not.
  56 #
  57 # See the file "Documentation/sparse.txt" for more details, including
  58 # where to get the "sparse" utility.
  59
  60 ifdef C
  61   ifeq ("$(origin C)", "command line")
  62     KBUILD_CHECKSRC = $(C)
  63   endif
  64 endif
  65 ifndef KBUILD_CHECKSRC
  66   KBUILD_CHECKSRC = 0
  67 endif
  68
  69 # Use make M=dir to specify directory of external module to build
  70 # Old syntax make ... SUBDIRS=$PWD is still supported
  71 # Setting the environment variable KBUILD_EXTMOD take precedence
  72 ifdef SUBDIRS
  73   KBUILD_EXTMOD ?= $(SUBDIRS)
  74 endif
  75 ifdef M
  76   ifeq ("$(origin M)", "command line")
  77     KBUILD_EXTMOD := $(M)
  78   endif
  79 endif
  80
  81
  82 # kbuild supports saving output files in a separate directory.
  83 # To locate output files in a separate directory two syntaxes are supported.
  84 # In both cases the working directory must be the root of the kernel src.
  85 # 1) O=
  86 # Use "make O=dir/to/store/output/files/"
  87 #
  88 # 2) Set KBUILD_OUTPUT
  89 # Set the environment variable KBUILD_OUTPUT to point to the directory
  90 # where the output files shall be placed.
  91 # export KBUILD_OUTPUT=dir/to/store/output/files/
  92 # make
  93 #
  94 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  95 # variable.
  96
  97
  98 # KBUILD_SRC is set on invocation of make in OBJ directory
  99 # KBUILD_SRC is not intended to be used by the regular user (for now)
 100 ifeq ($(KBUILD_SRC),)
 101
 102 # OK, Make called in directory where kernel src resides
 103 # Do we want to locate output files in a separate directory?
 104 ifdef O
 105   ifeq ("$(origin O)", "command line")
 106     KBUILD_OUTPUT := $(O)
 107   endif
 108 endif
 109
 110 # That's our default target when none is given on the command line
 111 PHONY := _all
 112 _all:
 113
 114 # Cancel implicit rules on top Makefile
 115 $(CURDIR)/Makefile Makefile: ;
 116
 117 ifneq ($(KBUILD_OUTPUT),)
 118 # Invoke a second make in the output directory, passing relevant variables
 119 # check that the output directory actually exists
 120 saved-output := $(KBUILD_OUTPUT)
 121 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 122 $(if $(KBUILD_OUTPUT),, \
 123      $(error output directory "$(saved-output)" does not exist))
 124
 125 PHONY += $(MAKECMDGOALS) sub-make
 126
 127 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 128         $(Q)@:
 129
 130 sub-make: FORCE
 131         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 132         KBUILD_SRC=$(CURDIR) \
 133         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 134         $(filter-out _all sub-make,$(MAKECMDGOALS))
 135
 136 # Leave processing to above invocation of make
 137 skip-makefile := 1
 138 endif # ifneq ($(KBUILD_OUTPUT),)
 139 endif # ifeq ($(KBUILD_SRC),)
 140
 141 # We process the rest of the Makefile if this is the final invocation of make
 142 ifeq ($(skip-makefile),)
 143
 144 # If building an external module we do not care about the all: rule
 145 # but instead _all depend on modules
 146 PHONY += all
 147 ifeq ($(KBUILD_EXTMOD),)
 148 _all: all
 149 else
 150 _all: modules
 151 endif
 152
 153 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 154 TOPDIR          := $(srctree)
 155 # FIXME - TOPDIR is obsolete, use srctree/objtree
 156 objtree         := $(CURDIR)
 157 src             := $(srctree)
 158 obj             := $(objtree)
 159
 160 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 161
 162 export srctree objtree VPATH TOPDIR
 163
 164
 165 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 166 # first, and if a usermode build is happening, the "ARCH=um" on the command
 167 # line overrides the setting of ARCH below.  If a native build is happening,
 168 # then ARCH is assigned, getting whatever value it gets normally, and
 169 # SUBARCH is subsequently ignored.
 170
 171 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 172                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 173                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 174                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 175                                   -e s/sh[234].*/sh/ )
 176
 177 SUBARCH := arm
 178
 179 # Cross compiling and selecting different set of gcc/bin-utils
 180 # ---------------------------------------------------------------------------
 181 #
 182 # When performing cross compilation for other architectures ARCH shall be set
 183 # to the target architecture. (See arch/* for the possibilities).
 184 # ARCH can be set during invocation of make:
 185 # make ARCH=ia64
 186 # Another way is to have ARCH set in the environment.
 187 # The default ARCH is the host where make is executed.
 188
 189 # CROSS_COMPILE specify the prefix used for all executables used
 190 # during compilation. Only gcc and related bin-utils executables
 191 # are prefixed with $(CROSS_COMPILE).
 192 # CROSS_COMPILE can be set on the command line
 193 # make CROSS_COMPILE=ia64-linux-
 194 # Alternatively CROSS_COMPILE can be set in the environment.
 195 # Default value for CROSS_COMPILE is not to prefix executables
 196 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 197 export KBUILD_BUILDHOST := $(SUBARCH)
 198 ARCH            ?= $(SUBARCH)
 199 CROSS_COMPILE   ?= arm-linux-
 200
 201 # Architecture as present in compile.h
 202 UTS_MACHINE     := $(ARCH)
 203 SRCARCH         := $(ARCH)
 204
 205 # Additional ARCH settings for x86
 206 ifeq ($(ARCH),i386)
 207         SRCARCH := x86
 208 endif
 209 ifeq ($(ARCH),x86_64)
 210         SRCARCH := x86
 211 endif
 212
 213 # Additional ARCH settings for sparc
 214 ifeq ($(ARCH),sparc64)
 215        SRCARCH := sparc
 216 endif
 217
 218 # Additional ARCH settings for sh
 219 ifeq ($(ARCH),sh64)
 220        SRCARCH := sh
 221 endif
 222
 223 # Where to locate arch specific headers
 224 hdr-arch  := $(SRCARCH)
 225
 226 ifeq ($(ARCH),m68knommu)
 227        hdr-arch  := m68k
 228 endif
 229
 230 KCONFIG_CONFIG  ?= .config
 231
 232 # SHELL used by kbuild
 233 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 234           else if [ -x /bin/bash ]; then echo /bin/bash; \
 235           else echo sh; fi ; fi)
 236
 237 HOSTCC       = gcc
 238 HOSTCXX      = g++
 239 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 240 HOSTCXXFLAGS = -O2
 241
 242 # Decide whether to build built-in, modular, or both.
 243 # Normally, just do built-in.
 244
 245 KBUILD_MODULES :=
 246 KBUILD_BUILTIN := 1
 247
 248 #       If we have only "make modules", don't compile built-in objects.
 249 #       When we're building modules with modversions, we need to consider
 250 #       the built-in objects during the descend as well, in order to
 251 #       make sure the checksums are up to date before we record them.
 252
 253 ifeq ($(MAKECMDGOALS),modules)
 254   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 255 endif
 256
 257 #       If we have "make <whatever> modules", compile modules
 258 #       in addition to whatever we do anyway.
 259 #       Just "make" or "make all" shall build modules as well
 260
 261 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 262   KBUILD_MODULES := 1
 263 endif
 264
 265 ifeq ($(MAKECMDGOALS),)
 266   KBUILD_MODULES := 1
 267 endif
 268
 269 export KBUILD_MODULES KBUILD_BUILTIN
 270 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 271
 272 # Beautify output
 273 # ---------------------------------------------------------------------------
 274 #
 275 # Normally, we echo the whole command before executing it. By making
 276 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 277 # $(quiet) to choose other forms of output instead, e.g.
 278 #
 279 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 280 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 281 #
 282 # If $(quiet) is empty, the whole command will be printed.
 283 # If it is set to "quiet_", only the short version will be printed.
 284 # If it is set to "silent_", nothing will be printed at all, since
 285 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 286 #
 287 # A simple variant is to prefix commands with $(Q) - that's useful
 288 # for commands that shall be hidden in non-verbose mode.
 289 #
 290 #       $(Q)ln $@ :<
 291 #
 292 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 293 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 294
 295 ifeq ($(KBUILD_VERBOSE),1)
 296   quiet =
 297   Q =
 298 else
 299   quiet=quiet_
 300   Q = @
 301 endif
 302
 303 # If the user is running make -s (silent mode), suppress echoing of
 304 # commands
 305
 306 ifneq ($(findstring s,$(MAKEFLAGS)),)
 307   quiet=silent_
 308 endif
 309
 310 export quiet Q KBUILD_VERBOSE
 311
 312
 313 # Look for make include files relative to root of kernel src
 314 MAKEFLAGS += --include-dir=$(srctree)
 315
 316 # We need some generic definitions (do not try to remake the file).
 317 $(srctree)/scripts/Kbuild.include: ;
 318 include $(srctree)/scripts/Kbuild.include
 319
 320 # Make variables (CC, etc...)
 321
 322 AS              = $(CROSS_COMPILE)as
 323 LD              = $(CROSS_COMPILE)ld
 324 CC              = $(CROSS_COMPILE)gcc
 325 CPP             = $(CC) -E
 326 AR              = $(CROSS_COMPILE)ar
 327 NM              = $(CROSS_COMPILE)nm
 328 STRIP           = $(CROSS_COMPILE)strip
 329 OBJCOPY         = $(CROSS_COMPILE)objcopy
 330 OBJDUMP         = $(CROSS_COMPILE)objdump
 331 AWK             = awk
 332 GENKSYMS        = scripts/genksyms/genksyms
 333 DEPMOD          = /sbin/depmod
 334 KALLSYMS        = scripts/kallsyms
 335 PERL            = perl
 336 CHECK           = sparse
 337
 338 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 339                   -Wbitwise -Wno-return-void $(CF)
 340 MODFLAGS        = -DMODULE
 341 CFLAGS_MODULE   = $(MODFLAGS)
 342 AFLAGS_MODULE   = $(MODFLAGS)
 343 LDFLAGS_MODULE  =
 344 CFLAGS_KERNEL   =
 345 AFLAGS_KERNEL   =
 346
 347
 348 # Use LINUXINCLUDE when you must reference the include/ directory.
 349 # Needed to be compatible with the O= option
 350 LINUXINCLUDE    := -Iinclude \
 351                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 352                    -I$(srctree)/arch/$(hdr-arch)/include               \
 353                    -include include/linux/autoconf.h
 354
 355 KBUILD_CPPFLAGS := -D__KERNEL__
 356
 357 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 358                    -fno-strict-aliasing -fno-common \
 359                    -Werror-implicit-function-declaration
 360 KBUILD_AFLAGS   := -D__ASSEMBLY__
 361
 362 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 363 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 364 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 365
 366 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 367 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 368 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 369 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 370
 371 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 372 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 373 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 374
 375 # When compiling out-of-tree modules, put MODVERDIR in the module
 376 # tree rather than in the kernel tree. The kernel tree might
 377 # even be read-only.
 378 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 379
 380 # Files to ignore in find ... statements
 381
 382 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
 383 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 384
 385 # ===========================================================================
 386 # Rules shared between *config targets and build targets
 387
 388 # Basic helpers built in scripts/
 389 PHONY += scripts_basic
 390 scripts_basic:
 391         $(Q)$(MAKE) $(build)=scripts/basic
 392
 393 # To avoid any implicit rule to kick in, define an empty command.
 394 scripts/basic/%: scripts_basic ;
 395
 396 PHONY += outputmakefile
 397 # outputmakefile generates a Makefile in the output directory, if using a
 398 # separate output directory. This allows convenient use of make in the
 399 # output directory.
 400 outputmakefile:
 401 ifneq ($(KBUILD_SRC),)
 402         $(Q)ln -fsn $(srctree) source
 403         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 404             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 405 endif
 406
 407 # To make sure we do not include .config for any of the *config targets
 408 # catch them early, and hand them over to scripts/kconfig/Makefile
 409 # It is allowed to specify more targets when calling make, including
 410 # mixing *config targets and build targets.
 411 # For example 'make oldconfig all'.
 412 # Detect when mixed targets is specified, and make a second invocation
 413 # of make so .config is not included in this case either (for *config).
 414
 415 no-dot-config-targets := clean mrproper distclean \
 416                          cscope TAGS tags help %docs check% \
 417                          include/linux/version.h headers_% \
 418                          kernelrelease kernelversion
 419
 420 config-targets := 0
 421 mixed-targets  := 0
 422 dot-config     := 1
 423
 424 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 425         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 426                 dot-config := 0
 427         endif
 428 endif
 429
 430 ifeq ($(KBUILD_EXTMOD),)
 431         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 432                 config-targets := 1
 433                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 434                         mixed-targets := 1
 435                 endif
 436         endif
 437 endif
 438
 439 ifeq ($(mixed-targets),1)
 440 # ===========================================================================
 441 # We're called with mixed targets (*config and build targets).
 442 # Handle them one by one.
 443
 444 %:: FORCE
 445         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 446
 447 else
 448 ifeq ($(config-targets),1)
 449 # ===========================================================================
 450 # *config targets only - make sure prerequisites are updated, and descend
 451 # in scripts/kconfig to make the *config target
 452
 453 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 454 # KBUILD_DEFCONFIG may point out an alternative default configuration
 455 # used for 'make defconfig'
 456 include $(srctree)/arch/$(SRCARCH)/Makefile
 457 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 458
 459 config: scripts_basic outputmakefile FORCE
 460         $(Q)mkdir -p include/linux include/config
 461         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 462
 463 %config: scripts_basic outputmakefile FORCE
 464         $(Q)mkdir -p include/linux include/config
 465         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 466
 467 else
 468 # ===========================================================================
 469 # Build targets only - this includes vmlinux, arch specific targets, clean
 470 # targets and others. In general all targets except *config targets.
 471
 472 ifeq ($(KBUILD_EXTMOD),)
 473 # Additional helpers built in scripts/
 474 # Carefully list dependencies so we do not try to build scripts twice
 475 # in parallel
 476 PHONY += scripts
 477 scripts: scripts_basic include/config/auto.conf
 478         $(Q)$(MAKE) $(build)=$(@)
 479
 480 # Objects we will link into vmlinux / subdirs we need to visit
 481 init-y          := init/
 482 drivers-y       := drivers/ sound/ firmware/
 483 net-y           := net/
 484 libs-y          := lib/
 485 core-y          := usr/
 486 endif # KBUILD_EXTMOD
 487
 488 ifeq ($(dot-config),1)
 489 # Read in config
 490 -include include/config/auto.conf
 491
 492 ifeq ($(KBUILD_EXTMOD),)
 493 # Read in dependencies to all Kconfig* files, make sure to run
 494 # oldconfig if changes are detected.
 495 -include include/config/auto.conf.cmd
 496
 497 # To avoid any implicit rule to kick in, define an empty command
 498 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 499
 500 # If .config is newer than include/config/auto.conf, someone tinkered
 501 # with it and forgot to run make oldconfig.
 502 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 503 # we execute the config step to be sure to catch updated Kconfig files
 504 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 505         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 506 else
 507 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 508 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 509 PHONY += include/config/auto.conf
 510
 511 include/config/auto.conf:
 512         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 513         echo;                                                           \
 514         echo "  ERROR: Kernel configuration is invalid.";               \
 515         echo "         include/linux/autoconf.h or $@ are missing.";    \
 516         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 517         echo;                                                           \
 518         /bin/false)
 519
 520 endif # KBUILD_EXTMOD
 521
 522 else
 523 # Dummy target needed, because used as prerequisite
 524 include/config/auto.conf: ;
 525 endif # $(dot-config)
 526
 527 # The all: target is the default when no target is given on the
 528 # command line.
 529 # This allow a user to issue only 'make' to build a kernel including modules
 530 # Defaults vmlinux but it is usually overridden in the arch makefile
 531 all: vmlinux
 532
 533 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 534 KBUILD_CFLAGS   += -Os
 535 else
 536 KBUILD_CFLAGS   += -O2
 537 endif
 538
 539 include $(srctree)/arch/$(SRCARCH)/Makefile
 540
 541 ifneq ($(CONFIG_FRAME_WARN),0)
 542 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 543 endif
 544
 545 # Force gcc to behave correct even for buggy distributions
 546 ifndef CONFIG_CC_STACKPROTECTOR
 547 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 548 endif
 549
 550 ifdef CONFIG_FRAME_POINTER
 551 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 552 else
 553 KBUILD_CFLAGS   += -fomit-frame-pointer
 554 endif
 555
 556 ifdef CONFIG_DEBUG_INFO
 557 KBUILD_CFLAGS   += -g
 558 KBUILD_AFLAGS   += -gdwarf-2
 559 endif
 560
 561 ifdef CONFIG_FUNCTION_TRACER
 562 KBUILD_CFLAGS   += -pg
 563 endif
 564
 565 # We trigger additional mismatches with less inlining
 566 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 567 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 568 endif
 569
 570 # arch Makefile may override CC so keep this after arch Makefile is included
 571 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 572 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 573
 574 # warn about C99 declaration after statement
 575 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 576
 577 # disable pointer signed / unsigned warnings in gcc 4.0
 578 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 579
 580 # disable invalid "can't wrap" optimizations for signed / pointers
 581 KBUILD_CFLAGS   += $(call cc-option,-fwrapv)
 582
 583 # revert to pre-gcc-4.4 behaviour of .eh_frame
 584 KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 585
 586 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 587 # But warn user when we do so
 588 warn-assign = \
 589 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 590
 591 ifneq ($(KCPPFLAGS),)
 592         $(call warn-assign,CPPFLAGS)
 593         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 594 endif
 595 ifneq ($(KAFLAGS),)
 596         $(call warn-assign,AFLAGS)
 597         KBUILD_AFLAGS += $(KAFLAGS)
 598 endif
 599 ifneq ($(KCFLAGS),)
 600         $(call warn-assign,CFLAGS)
 601         KBUILD_CFLAGS += $(KCFLAGS)
 602 endif
 603
 604 # Use --build-id when available.
 605 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 606                               $(call ld-option, -Wl$(comma)--build-id,))
 607 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 608 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 609
 610 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 611 LDFLAGS_vmlinux += -X
 612 endif
 613
 614 # Default kernel image to build when no specific target is given.
 615 # KBUILD_IMAGE may be overruled on the command line or
 616 # set in the environment
 617 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 618 # this default value
 619 export KBUILD_IMAGE ?= vmlinux
 620
 621 #
 622 # INSTALL_PATH specifies where to place the updated kernel and system map
 623 # images. Default is /boot, but you can set it to other values
 624 export  INSTALL_PATH ?= /boot
 625
 626 #
 627 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 628 # relocations required by build roots.  This is not defined in the
 629 # makefile but the argument can be passed to make if needed.
 630 #
 631
 632 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 633 export MODLIB
 634
 635 #
 636 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 637 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 638 #  the default option --strip-debug will be used.  Otherwise,
 639 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 640
 641 ifdef INSTALL_MOD_STRIP
 642 ifeq ($(INSTALL_MOD_STRIP),1)
 643 mod_strip_cmd = $(STRIP) --strip-debug
 644 else
 645 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 646 endif # INSTALL_MOD_STRIP=1
 647 else
 648 mod_strip_cmd = true
 649 endif # INSTALL_MOD_STRIP
 650 export mod_strip_cmd
 651
 652
 653 ifeq ($(KBUILD_EXTMOD),)
 654 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 655
 656 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 657                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 658                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 659
 660 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 661                      $(init-n) $(init-) \
 662                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 663                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 664
 665 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 666 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 667 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 668 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 669 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 670 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 671 libs-y          := $(libs-y1) $(libs-y2)
 672
 673 # Build vmlinux
 674 # ---------------------------------------------------------------------------
 675 # vmlinux is built from the objects selected by $(vmlinux-init) and
 676 # $(vmlinux-main). Most are built-in.o files from top-level directories
 677 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 678 # Ordering when linking is important, and $(vmlinux-init) must be first.
 679 #
 680 # vmlinux
 681 #   ^
 682 #   |
 683 #   +-< $(vmlinux-init)
 684 #   |   +--< init/version.o + more
 685 #   |
 686 #   +--< $(vmlinux-main)
 687 #   |    +--< driver/built-in.o mm/built-in.o + more
 688 #   |
 689 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 690 #
 691 # vmlinux version (uname -v) cannot be updated during normal
 692 # descending-into-subdirs phase since we do not yet know if we need to
 693 # update vmlinux.
 694 # Therefore this step is delayed until just before final link of vmlinux -
 695 # except in the kallsyms case where it is done just before adding the
 696 # symbols to the kernel.
 697 #
 698 # System.map is generated to document addresses of all kernel symbols
 699
 700 vmlinux-init := $(head-y) $(init-y)
 701 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 702 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 703 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 704 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 705
 706 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 707 # May be overridden by arch/$(ARCH)/Makefile
 708 quiet_cmd_vmlinux__ ?= LD      $@
 709       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 710       -T $(vmlinux-lds) $(vmlinux-init)                          \
 711       --start-group $(vmlinux-main) --end-group                  \
 712       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 713
 714 # Generate new vmlinux version
 715 quiet_cmd_vmlinux_version = GEN     .version
 716       cmd_vmlinux_version = set -e;                     \
 717         if [ ! -r .version ]; then                      \
 718           rm -f .version;                               \
 719           echo 1 >.version;                             \
 720         else                                            \
 721           mv .version .old_version;                     \
 722           expr 0$$(cat .old_version) + 1 >.version;     \
 723         fi;                                             \
 724         $(MAKE) $(build)=init
 725
 726 # Generate System.map
 727 quiet_cmd_sysmap = SYSMAP
 728       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 729
 730 # Link of vmlinux
 731 # If CONFIG_KALLSYMS is set .version is already updated
 732 # Generate System.map and verify that the content is consistent
 733 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 734 # First command is ':' to allow us to use + in front of the rule
 735 define rule_vmlinux__
 736         :
 737         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 738
 739         $(call cmd,vmlinux__)
 740         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 741
 742         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 743           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 744         $(cmd_sysmap) $@ System.map;                                         \
 745         if [ $$? -ne 0 ]; then                                               \
 746                 rm -f $@;                                                    \
 747                 /bin/false;                                                  \
 748         fi;
 749         $(verify_kallsyms)
 750 endef
 751
 752
 753 ifdef CONFIG_KALLSYMS
 754 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 755 # It's a three stage process:
 756 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 757 #   empty
 758 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 759 #   the right size - vmlinux version (uname -v) is updated during this step
 760 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 761 #   but due to the added section, some addresses have shifted.
 762 #   From here, we generate a correct .tmp_kallsyms2.o
 763 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 764 # o Verify that the System.map from vmlinux matches the map from
 765 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 766 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 767 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 768 #   temporary bypass to allow the kernel to be built while the
 769 #   maintainers work out what went wrong with kallsyms.
 770
 771 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 772 last_kallsyms := 3
 773 else
 774 last_kallsyms := 2
 775 endif
 776
 777 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 778
 779 define verify_kallsyms
 780         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 781           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 782           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 783         $(Q)cmp -s System.map .tmp_System.map ||                             \
 784                 (echo Inconsistent kallsyms data;                            \
 785                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 786                  rm .tmp_kallsyms* ; /bin/false )
 787 endef
 788
 789 # Update vmlinux version before link
 790 # Use + in front of this rule to silent warning about make -j1
 791 # First command is ':' to allow us to use + in front of this rule
 792 cmd_ksym_ld = $(cmd_vmlinux__)
 793 define rule_ksym_ld
 794         :
 795         +$(call cmd,vmlinux_version)
 796         $(call cmd,vmlinux__)
 797         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 798 endef
 799
 800 # Generate .S file with all kernel symbols
 801 quiet_cmd_kallsyms = KSYM    $@
 802       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 803                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 804
 805 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 806         $(call if_changed_dep,as_o_S)
 807
 808 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 809         $(call cmd,kallsyms)
 810
 811 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 812 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 813         $(call if_changed_rule,ksym_ld)
 814
 815 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 816         $(call if_changed,vmlinux__)
 817
 818 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 819         $(call if_changed,vmlinux__)
 820
 821 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 822 $(KALLSYMS): scripts ;
 823
 824 # Generate some data for debugging strange kallsyms problems
 825 debug_kallsyms: .tmp_map$(last_kallsyms)
 826
 827 .tmp_map%: .tmp_vmlinux% FORCE
 828         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 829
 830 .tmp_map3: .tmp_map2
 831
 832 .tmp_map2: .tmp_map1
 833
 834 endif # ifdef CONFIG_KALLSYMS
 835
 836 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 837 # relevant sections renamed as per the linker script.
 838 quiet_cmd_vmlinux-modpost = LD      $@
 839       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 840          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 841          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 842 define rule_vmlinux-modpost
 843         :
 844         +$(call cmd,vmlinux-modpost)
 845         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 846         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 847 endef
 848
 849 # vmlinux image - including updated kernel symbols
 850 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 851 ifdef CONFIG_HEADERS_CHECK
 852         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 853 endif
 854 ifdef CONFIG_SAMPLES
 855         $(Q)$(MAKE) $(build)=samples
 856 endif
 857 ifdef CONFIG_BUILD_DOCSRC
 858         $(Q)$(MAKE) $(build)=Documentation
 859 endif
 860         $(call vmlinux-modpost)
 861         $(call if_changed_rule,vmlinux__)
 862         $(Q)rm -f .old_version
 863
 864 # build vmlinux.o first to catch section mismatch errors early
 865 ifdef CONFIG_KALLSYMS
 866 .tmp_vmlinux1: vmlinux.o
 867 endif
 868
 869 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 870 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 871         $(call if_changed_rule,vmlinux-modpost)
 872
 873 # The actual objects are generated when descending,
 874 # make sure no implicit rule kicks in
 875 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 876
 877 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 878 # Preset locale variables to speed up the build process. Limit locale
 879 # tweaks to this spot to avoid wrong language settings when running
 880 # make menuconfig etc.
 881 # Error messages still appears in the original language
 882
 883 PHONY += $(vmlinux-dirs)
 884 $(vmlinux-dirs): prepare scripts
 885         $(Q)$(MAKE) $(build)=$@
 886
 887 # Build the kernel release string
 888 #
 889 # The KERNELRELEASE value built here is stored in the file
 890 # include/config/kernel.release, and is used when executing several
 891 # make targets, such as "make install" or "make modules_install."
 892 #
 893 # The eventual kernel release string consists of the following fields,
 894 # shown in a hierarchical format to show how smaller parts are concatenated
 895 # to form the larger and final value, with values coming from places like
 896 # the Makefile, kernel config options, make command line options and/or
 897 # SCM tag information.
 898 #
 899 #       $(KERNELVERSION)
 900 #         $(VERSION)                    eg, 2
 901 #         $(PATCHLEVEL)                 eg, 6
 902 #         $(SUBLEVEL)                   eg, 18
 903 #         $(EXTRAVERSION)               eg, -rc6
 904 #       $(localver-full)
 905 #         $(localver)
 906 #           localversion*               (files without backups, containing '~')
 907 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 908 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 909 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 910 #           $(LOCALVERSION)             (from make command line if provided)
 911 #
 912 #  Note how the final $(localver-auto) string is included *only* if the
 913 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 914 # moment, only git is supported but other SCMs can edit the script
 915 # scripts/setlocalversion and add the appropriate checks as needed.
 916
 917 pattern = ".*/localversion[^~]*"
 918 string  = $(shell cat /dev/null \
 919            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 920
 921 localver = $(subst $(space),, $(string) \
 922                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 923
 924 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 925 # and if the SCM is know a tag from the SCM is appended.
 926 # The appended tag is determined by the SCM used.
 927 #
 928 # .scmversion is used when generating rpm packages so we do not loose
 929 # the version information from the SCM when we do the build of the kernel
 930 # from the copied source
 931 ifdef CONFIG_LOCALVERSION_AUTO
 932
 933 ifeq ($(wildcard .scmversion),)
 934         _localver-auto = $(shell $(CONFIG_SHELL) \
 935                          $(srctree)/scripts/setlocalversion $(srctree))
 936 else
 937         _localver-auto = $(shell cat .scmversion 2> /dev/null)
 938 endif
 939
 940         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 941 endif
 942
 943 localver-full = $(localver)$(localver-auto)
 944
 945 # Store (new) KERNELRELASE string in include/config/kernel.release
 946 kernelrelease = $(KERNELVERSION)$(localver-full)
 947 include/config/kernel.release: include/config/auto.conf FORCE
 948         $(Q)rm -f $@
 949         $(Q)echo $(kernelrelease) > $@
 950
 951
 952 # Things we need to do before we recursively start building the kernel
 953 # or the modules are listed in "prepare".
 954 # A multi level approach is used. prepareN is processed before prepareN-1.
 955 # archprepare is used in arch Makefiles and when processed asm symlink,
 956 # version.h and scripts_basic is processed / created.
 957
 958 # Listed in dependency order
 959 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 960
 961 # prepare3 is used to check if we are building in a separate output directory,
 962 # and if so do:
 963 # 1) Check that make has not been executed in the kernel src $(srctree)
 964 # 2) Create the include2 directory, used for the second asm symlink
 965 prepare3: include/config/kernel.release
 966 ifneq ($(KBUILD_SRC),)
 967         @$(kecho) '  Using $(srctree) as source for kernel'
 968         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 969                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 970                 echo "  in the '$(srctree)' directory.";\
 971                 /bin/false; \
 972         fi;
 973         $(Q)if [ ! -d include2 ]; then                                  \
 974             mkdir -p include2;                                          \
 975             ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 976         fi
 977 endif
 978
 979 # prepare2 creates a makefile if using a separate output directory
 980 prepare2: prepare3 outputmakefile
 981
 982 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 983                    include/asm include/config/auto.conf
 984         $(cmd_crmodverdir)
 985
 986 archprepare: prepare1 scripts_basic
 987
 988 prepare0: archprepare FORCE
 989         $(Q)$(MAKE) $(build)=.
 990         $(Q)$(MAKE) $(build)=. missing-syscalls
 991
 992 # All the preparing..
 993 prepare: prepare0
 994
 995 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 996 # done in arch/$(ARCH)/kernel/Makefile
 997
 998 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 999
1000 # The asm symlink changes when $(ARCH) changes.
1001 # Detect this and ask user to run make mrproper
1002 # If asm is a stale symlink (point to dir that does not exist) remove it
1003 define check-symlink
1004         set -e;                                                            \
1005         if [ -L include/asm ]; then                                        \
1006                 asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
1007                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
1008                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1009                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
1010                         exit 1;                                            \
1011                 fi;                                                        \
1012                 test -e $$asmlink || rm include/asm;                       \
1013         elif [ -d include/asm ]; then                                      \
1014                 echo "ERROR: $@ is a directory but a symlink was expected";\
1015                 exit 1;                                                    \
1016         fi
1017 endef
1018
1019 # We create the target directory of the symlink if it does
1020 # not exist so the test in check-symlink works and we have a
1021 # directory for generated filesas used by some architectures.
1022 define create-symlink
1023         if [ ! -L include/asm ]; then                                      \
1024                         $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1025                         if [ ! -d include/asm-$(SRCARCH) ]; then           \
1026                                 mkdir -p include/asm-$(SRCARCH);           \
1027                         fi;                                                \
1028                         ln -fsn asm-$(SRCARCH) $@;                         \
1029         fi
1030 endef
1031
1032 include/asm: FORCE
1033         $(Q)$(check-symlink)
1034         $(Q)$(create-symlink)
1035
1036 # Generate some files
1037 # ---------------------------------------------------------------------------
1038
1039 # KERNELRELEASE can change from a few different places, meaning version.h
1040 # needs to be updated, so this check is forced on all builds
1041
1042 uts_len := 64
1043 define filechk_utsrelease.h
1044         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1045           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1046           exit 1;                                                         \
1047         fi;                                                               \
1048         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1049 endef
1050
1051 define filechk_version.h
1052         (echo \#define LINUX_VERSION_CODE $(shell                             \
1053         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1054         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1055 endef
1056
1057 include/linux/version.h: $(srctree)/Makefile FORCE
1058         $(call filechk,version.h)
1059
1060 include/linux/utsrelease.h: include/config/kernel.release FORCE
1061         $(call filechk,utsrelease.h)
1062
1063 PHONY += headerdep
1064 headerdep:
1065         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1066
1067 # ---------------------------------------------------------------------------
1068
1069 PHONY += depend dep
1070 depend dep:
1071         @echo '*** Warning: make $@ is unnecessary now.'
1072
1073 # ---------------------------------------------------------------------------
1074 # Firmware install
1075 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1076 export INSTALL_FW_PATH
1077
1078 PHONY += firmware_install
1079 firmware_install: FORCE
1080         @mkdir -p $(objtree)/firmware
1081         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1082
1083 # ---------------------------------------------------------------------------
1084 # Kernel headers
1085
1086 #Default location for installed headers
1087 export INSTALL_HDR_PATH = $(objtree)/usr
1088
1089 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1090 # Find out where the Kbuild file is located to support
1091 # arch/$(ARCH)/include/asm
1092 hdr-dir = $(strip                                                         \
1093           $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1094                arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1095
1096 # If we do an all arch process set dst to asm-$(hdr-arch)
1097 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1098
1099 PHONY += __headers
1100 __headers: include/linux/version.h scripts_basic FORCE
1101         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1102
1103 PHONY += headers_install_all
1104 headers_install_all:
1105         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1106
1107 PHONY += headers_install
1108 headers_install: __headers
1109         $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1110         $(error Headers not exportable for the $(SRCARCH) architecture))
1111         $(Q)$(MAKE) $(hdr-inst)=include
1112         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1113
1114 PHONY += headers_check_all
1115 headers_check_all: headers_install_all
1116         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1117
1118 PHONY += headers_check
1119 headers_check: headers_install
1120         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1121         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1122
1123 # ---------------------------------------------------------------------------
1124 # Modules
1125
1126 ifdef CONFIG_MODULES
1127
1128 # By default, build modules as well
1129
1130 all: modules
1131
1132 #       Build modules
1133 #
1134 #       A module can be listed more than once in obj-m resulting in
1135 #       duplicate lines in modules.order files.  Those are removed
1136 #       using awk while concatenating to the final file.
1137
1138 PHONY += modules
1139 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1140         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1141         @$(kecho) '  Building modules, stage 2.';
1142         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1143         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1144
1145
1146 # Target to prepare building external modules
1147 PHONY += modules_prepare
1148 modules_prepare: prepare scripts
1149
1150 # Target to install modules
1151 PHONY += modules_install
1152 modules_install: _modinst_ _modinst_post
1153
1154 PHONY += _modinst_
1155 _modinst_:
1156         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1157                 echo "Warning: you may need to install module-init-tools"; \
1158                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1159                 sleep 1; \
1160         fi
1161         @rm -rf $(MODLIB)/kernel
1162         @rm -f $(MODLIB)/source
1163         @mkdir -p $(MODLIB)/kernel
1164         @ln -s $(srctree) $(MODLIB)/source
1165         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1166                 rm -f $(MODLIB)/build ; \
1167                 ln -s $(objtree) $(MODLIB)/build ; \
1168         fi
1169         @cp -f $(objtree)/modules.order $(MODLIB)/
1170         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1171
1172 # This depmod is only for convenience to give the initial
1173 # boot a modules.dep even before / is mounted read-write.  However the
1174 # boot script depmod is the master version.
1175 PHONY += _modinst_post
1176 _modinst_post: _modinst_
1177         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1178         $(call cmd,depmod)
1179
1180 else # CONFIG_MODULES
1181
1182 # Modules not configured
1183 # ---------------------------------------------------------------------------
1184
1185 modules modules_install: FORCE
1186         @echo
1187         @echo "The present kernel configuration has modules disabled."
1188         @echo "Type 'make config' and enable loadable module support."
1189         @echo "Then build a kernel with module support enabled."
1190         @echo
1191         @exit 1
1192
1193 endif # CONFIG_MODULES
1194
1195 ###
1196 # Cleaning is done on three levels.
1197 # make clean     Delete most generated files
1198 #                Leave enough to build external modules
1199 # make mrproper  Delete the current configuration, and all generated files
1200 # make distclean Remove editor backup files, patch leftover files and the like
1201
1202 # Directories & files removed with 'make clean'
1203 CLEAN_DIRS  += $(MODVERDIR)
1204 CLEAN_FILES +=  vmlinux System.map \
1205                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1206
1207 # Directories & files removed with 'make mrproper'
1208 MRPROPER_DIRS  += include/config include2 usr/include include/generated
1209 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1210                   include/linux/autoconf.h include/linux/version.h      \
1211                   include/linux/utsrelease.h                            \
1212                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1213                   Module.symvers Module.markers tags TAGS cscope*
1214
1215 # clean - Delete most, but leave enough to build external modules
1216 #
1217 clean: rm-dirs  := $(CLEAN_DIRS)
1218 clean: rm-files := $(CLEAN_FILES)
1219 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1220
1221 PHONY += $(clean-dirs) clean archclean
1222 $(clean-dirs):
1223         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1224
1225 clean: archclean $(clean-dirs)
1226         $(call cmd,rmdirs)
1227         $(call cmd,rmfiles)
1228         @find . $(RCS_FIND_IGNORE) \
1229                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1230                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1231                 -o -name '*.symtypes' -o -name 'modules.order' \
1232                 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1233                 -type f -print | xargs rm -f
1234
1235 # mrproper - Delete all generated files, including .config
1236 #
1237 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1238 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1239 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1240
1241 PHONY += $(mrproper-dirs) mrproper archmrproper
1242 $(mrproper-dirs):
1243         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1244
1245 mrproper: clean archmrproper $(mrproper-dirs)
1246         $(call cmd,rmdirs)
1247         $(call cmd,rmfiles)
1248
1249 # distclean
1250 #
1251 PHONY += distclean
1252
1253 distclean: mrproper
1254         @find $(srctree) $(RCS_FIND_IGNORE) \
1255                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1256                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1257                 -o -name '.*.rej' -o -size 0 \
1258                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1259                 -type f -print | xargs rm -f
1260
1261
1262 # Packaging of the kernel to various formats
1263 # ---------------------------------------------------------------------------
1264 # rpm target kept for backward compatibility
1265 package-dir     := $(srctree)/scripts/package
1266
1267 %pkg: include/config/kernel.release FORCE
1268         $(Q)$(MAKE) $(build)=$(package-dir) $@
1269 rpm: include/config/kernel.release FORCE
1270         $(Q)$(MAKE) $(build)=$(package-dir) $@
1271
1272
1273 # Brief documentation of the typical targets used
1274 # ---------------------------------------------------------------------------
1275
1276 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1277 boards := $(notdir $(boards))
1278 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1279 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1280
1281 help:
1282         @echo  'Cleaning targets:'
1283         @echo  '  clean           - Remove most generated files but keep the config and'
1284         @echo  '                    enough build support to build external modules'
1285         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1286         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1287         @echo  ''
1288         @echo  'Configuration targets:'
1289         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1290         @echo  ''
1291         @echo  'Other generic targets:'
1292         @echo  '  all             - Build all targets marked with [*]'
1293         @echo  '* vmlinux         - Build the bare kernel'
1294         @echo  '* modules         - Build all modules'
1295         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1296         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1297         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1298         @echo  '  dir/            - Build all files in dir and below'
1299         @echo  '  dir/file.[ois]  - Build specified target only'
1300         @echo  '  dir/file.ko     - Build module including final link'
1301         @echo  '  modules_prepare - Set up for building external modules'
1302         @echo  '  tags/TAGS       - Generate tags file for editors'
1303         @echo  '  cscope          - Generate cscope index'
1304         @echo  '  kernelrelease   - Output the release version string'
1305         @echo  '  kernelversion   - Output the version stored in Makefile'
1306         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1307          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1308          echo  ''
1309         @echo  'Static analysers'
1310         @echo  '  checkstack      - Generate a list of stack hogs'
1311         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1312         @echo  '  versioncheck    - Sanity check on version.h usage'
1313         @echo  '  includecheck    - Check for duplicate included header files'
1314         @echo  '  export_report   - List the usages of all exported symbols'
1315         @echo  '  headers_check   - Sanity check on exported headers'
1316         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1317          echo  ''
1318         @echo  'Kernel packaging:'
1319         @$(MAKE) $(build)=$(package-dir) help
1320         @echo  ''
1321         @echo  'Documentation targets:'
1322         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1323         @echo  ''
1324         @echo  'Architecture specific targets ($(SRCARCH)):'
1325         @$(if $(archhelp),$(archhelp),\
1326                 echo '  No architecture specific help defined for $(SRCARCH)')
1327         @echo  ''
1328         @$(if $(boards), \
1329                 $(foreach b, $(boards), \
1330                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1331                 echo '')
1332         @$(if $(board-dirs), \
1333                 $(foreach b, $(board-dirs), \
1334                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1335                 printf "  %-16s - Show all of the above\\n" help-boards; \
1336                 echo '')
1337
1338         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1339         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1340         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1341         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1342         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1343         @echo  ''
1344         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1345         @echo  'For further info see the ./README file'
1346
1347
1348 help-board-dirs := $(addprefix help-,$(board-dirs))
1349
1350 help-boards: $(help-board-dirs)
1351
1352 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1353
1354 $(help-board-dirs): help-%:
1355         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1356         @$(if $(boards-per-dir), \
1357                 $(foreach b, $(boards-per-dir), \
1358                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1359                 echo '')
1360
1361
1362 # Documentation targets
1363 # ---------------------------------------------------------------------------
1364 %docs: scripts_basic FORCE
1365         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1366
1367 else # KBUILD_EXTMOD
1368
1369 ###
1370 # External module support.
1371 # When building external modules the kernel used as basis is considered
1372 # read-only, and no consistency checks are made and the make
1373 # system is not used on the basis kernel. If updates are required
1374 # in the basis kernel ordinary make commands (without M=...) must
1375 # be used.
1376 #
1377 # The following are the only valid targets when building external
1378 # modules.
1379 # make M=dir clean     Delete all automatically generated files
1380 # make M=dir modules   Make all modules in specified dir
1381 # make M=dir           Same as 'make M=dir modules'
1382 # make M=dir modules_install
1383 #                      Install the modules built in the module directory
1384 #                      Assumes install directory is already created
1385
1386 # We are always building modules
1387 KBUILD_MODULES := 1
1388 PHONY += crmodverdir
1389 crmodverdir:
1390         $(cmd_crmodverdir)
1391
1392 PHONY += $(objtree)/Module.symvers
1393 $(objtree)/Module.symvers:
1394         @test -e $(objtree)/Module.symvers || ( \
1395         echo; \
1396         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1397         echo "           is missing; modules will have no dependencies and modversions."; \
1398         echo )
1399
1400 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1401 PHONY += $(module-dirs) modules
1402 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1403         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1404
1405 modules: $(module-dirs)
1406         @$(kecho) '  Building modules, stage 2.';
1407         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1408
1409 PHONY += modules_install
1410 modules_install: _emodinst_ _emodinst_post
1411
1412 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1413 PHONY += _emodinst_
1414 _emodinst_:
1415         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1416         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1417
1418 PHONY += _emodinst_post
1419 _emodinst_post: _emodinst_
1420         $(call cmd,depmod)
1421
1422 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1423
1424 PHONY += $(clean-dirs) clean
1425 $(clean-dirs):
1426         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1427
1428 clean:  rm-dirs := $(MODVERDIR)
1429 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1430                    $(KBUILD_EXTMOD)/Module.markers \
1431                    $(KBUILD_EXTMOD)/modules.order
1432 clean: $(clean-dirs)
1433         $(call cmd,rmdirs)
1434         $(call cmd,rmfiles)
1435         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1436                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1437                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1438                 -type f -print | xargs rm -f
1439
1440 help:
1441         @echo  '  Building external modules.'
1442         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1443         @echo  ''
1444         @echo  '  modules         - default target, build the module(s)'
1445         @echo  '  modules_install - install the module'
1446         @echo  '  clean           - remove generated files in module directory only'
1447         @echo  ''
1448
1449 # Dummies...
1450 PHONY += prepare scripts
1451 prepare: ;
1452 scripts: ;
1453 endif # KBUILD_EXTMOD
1454
1455 # Generate tags for editors
1456 # ---------------------------------------------------------------------------
1457 quiet_cmd_tags = GEN     $@
1458       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1459
1460 tags TAGS cscope: FORCE
1461         $(call cmd,tags)
1462
1463 # Scripts to check various things for consistency
1464 # ---------------------------------------------------------------------------
1465
1466 includecheck:
1467         find * $(RCS_FIND_IGNORE) \
1468                 -name '*.[hcS]' -type f -print | sort \
1469                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1470
1471 versioncheck:
1472         find * $(RCS_FIND_IGNORE) \
1473                 -name '*.[hcS]' -type f -print | sort \
1474                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1475
1476 namespacecheck:
1477         $(PERL) $(srctree)/scripts/namespace.pl
1478
1479 export_report:
1480         $(PERL) $(srctree)/scripts/export_report.pl
1481
1482 endif #ifeq ($(config-targets),1)
1483 endif #ifeq ($(mixed-targets),1)
1484
1485 PHONY += checkstack kernelrelease kernelversion
1486
1487 # UML needs a little special treatment here.  It wants to use the host
1488 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1489 # else wants $(ARCH), including people doing cross-builds, which means
1490 # that $(SUBARCH) doesn't work here.
1491 ifeq ($(ARCH), um)
1492 CHECKSTACK_ARCH := $(SUBARCH)
1493 else
1494 CHECKSTACK_ARCH := $(ARCH)
1495 endif
1496 checkstack:
1497         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1498         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1499
1500 kernelrelease:
1501         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1502         $(error kernelrelease not valid - run 'make prepare' to update it))
1503 kernelversion:
1504         @echo $(KERNELVERSION)
1505
1506 # Single targets
1507 # ---------------------------------------------------------------------------
1508 # Single targets are compatible with:
1509 # - build with mixed source and output
1510 # - build with separate output dir 'make O=...'
1511 # - external modules
1512 #
1513 #  target-dir => where to store outputfile
1514 #  build-dir  => directory in kernel source tree to use
1515
1516 ifeq ($(KBUILD_EXTMOD),)
1517         build-dir  = $(patsubst %/,%,$(dir $@))
1518         target-dir = $(dir $@)
1519 else
1520         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1521         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1522         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1523 endif
1524
1525 %.s: %.c prepare scripts FORCE
1526         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527 %.i: %.c prepare scripts FORCE
1528         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529 %.o: %.c prepare scripts FORCE
1530         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531 %.lst: %.c prepare scripts FORCE
1532         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533 %.s: %.S prepare scripts FORCE
1534         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535 %.o: %.S prepare scripts FORCE
1536         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537 %.symtypes: %.c prepare scripts FORCE
1538         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1539
1540 # Modules
1541 /: prepare scripts FORCE
1542         $(cmd_crmodverdir)
1543         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1544         $(build)=$(build-dir)
1545 %/: prepare scripts FORCE
1546         $(cmd_crmodverdir)
1547         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1548         $(build)=$(build-dir)
1549 %.ko: prepare scripts FORCE
1550         $(cmd_crmodverdir)
1551         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1552         $(build)=$(build-dir) $(@:.ko=.o)
1553         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1554
1555 # FIXME Should go into a make.lib or something
1556 # ===========================================================================
1557
1558 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1559       cmd_rmdirs = rm -rf $(rm-dirs)
1560
1561 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1562       cmd_rmfiles = rm -f $(rm-files)
1563
1564 # Run depmod only if we have System.map and depmod is executable
1565 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1566       cmd_depmod = \
1567         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1568                 $(DEPMOD) -ae -F System.map                                     \
1569                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1570                 $(KERNELRELEASE);                                               \
1571         fi
1572
1573 # Create temporary dir for module support files
1574 # clean it up only when building all modules
1575 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1576                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1577
1578 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1579           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1580           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1581
1582 quiet_cmd_as_o_S = AS      $@
1583 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1584
1585 # read all saved command lines
1586
1587 targets := $(wildcard $(sort $(targets)))
1588 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1589
1590 ifneq ($(cmd_files),)
1591   $(cmd_files): ;       # Do not try to update included dependency files
1592   include $(cmd_files)
1593 endif
1594
1595 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1596 # Usage:
1597 # $(Q)$(MAKE) $(clean)=dir
1598 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1599
1600 endif   # skip-makefile
1601
1602 PHONY += FORCE
1603 FORCE:
1604
1605 # Declare the contents of the .PHONY variable as phony.  We keep that
1606 # information in a variable so we can use it in if_changed and friends.
1607 .PHONY: $(PHONY)