Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 30
   4 EXTRAVERSION = -rc7
   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 ifdef V
  39   ifeq ("$(origin V)", "command line")
  40     KBUILD_VERBOSE = $(V)
  41   endif
  42 endif
  43 ifndef KBUILD_VERBOSE
  44   KBUILD_VERBOSE = 0
  45 endif
  46
  47 # Call a source code checker (by default, "sparse") as part of the
  48 # C compilation.
  49 #
  50 # Use 'make C=1' to enable checking of only re-compiled files.
  51 # Use 'make C=2' to enable checking of *all* source files, regardless
  52 # of whether they are re-compiled or not.
  53 #
  54 # See the file "Documentation/sparse.txt" for more details, including
  55 # where to get the "sparse" utility.
  56
  57 ifdef C
  58   ifeq ("$(origin C)", "command line")
  59     KBUILD_CHECKSRC = $(C)
  60   endif
  61 endif
  62 ifndef KBUILD_CHECKSRC
  63   KBUILD_CHECKSRC = 0
  64 endif
  65
  66 # Use make M=dir to specify directory of external module to build
  67 # Old syntax make ... SUBDIRS=$PWD is still supported
  68 # Setting the environment variable KBUILD_EXTMOD take precedence
  69 ifdef SUBDIRS
  70   KBUILD_EXTMOD ?= $(SUBDIRS)
  71 endif
  72 ifdef M
  73   ifeq ("$(origin M)", "command line")
  74     KBUILD_EXTMOD := $(M)
  75   endif
  76 endif
  77
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(KBUILD_SRC),)
  98
  99 # OK, Make called in directory where kernel src resides
 100 # Do we want to locate output files in a separate directory?
 101 ifdef O
 102   ifeq ("$(origin O)", "command line")
 103     KBUILD_OUTPUT := $(O)
 104   endif
 105 endif
 106
 107 # That's our default target when none is given on the command line
 108 PHONY := _all
 109 _all:
 110
 111 # Cancel implicit rules on top Makefile
 112 $(CURDIR)/Makefile Makefile: ;
 113
 114 ifneq ($(KBUILD_OUTPUT),)
 115 # Invoke a second make in the output directory, passing relevant variables
 116 # check that the output directory actually exists
 117 saved-output := $(KBUILD_OUTPUT)
 118 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 119 $(if $(KBUILD_OUTPUT),, \
 120      $(error output directory "$(saved-output)" does not exist))
 121
 122 PHONY += $(MAKECMDGOALS) sub-make
 123
 124 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 125         $(Q)@:
 126
 127 sub-make: FORCE
 128         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 129         KBUILD_SRC=$(CURDIR) \
 130         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 131         $(filter-out _all sub-make,$(MAKECMDGOALS))
 132
 133 # Leave processing to above invocation of make
 134 skip-makefile := 1
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136 endif # ifeq ($(KBUILD_SRC),)
 137
 138 # We process the rest of the Makefile if this is the final invocation of make
 139 ifeq ($(skip-makefile),)
 140
 141 # If building an external module we do not care about the all: rule
 142 # but instead _all depend on modules
 143 PHONY += all
 144 ifeq ($(KBUILD_EXTMOD),)
 145 _all: all
 146 else
 147 _all: modules
 148 endif
 149
 150 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 151 TOPDIR          := $(srctree)
 152 # FIXME - TOPDIR is obsolete, use srctree/objtree
 153 objtree         := $(CURDIR)
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH TOPDIR
 160
 161
 162 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 163 # first, and if a usermode build is happening, the "ARCH=um" on the command
 164 # line overrides the setting of ARCH below.  If a native build is happening,
 165 # then ARCH is assigned, getting whatever value it gets normally, and
 166 # SUBARCH is subsequently ignored.
 167
 168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                   -e s/sh[234].*/sh/ )
 173
 174 # Cross compiling and selecting different set of gcc/bin-utils
 175 # ---------------------------------------------------------------------------
 176 #
 177 # When performing cross compilation for other architectures ARCH shall be set
 178 # to the target architecture. (See arch/* for the possibilities).
 179 # ARCH can be set during invocation of make:
 180 # make ARCH=ia64
 181 # Another way is to have ARCH set in the environment.
 182 # The default ARCH is the host where make is executed.
 183
 184 # CROSS_COMPILE specify the prefix used for all executables used
 185 # during compilation. Only gcc and related bin-utils executables
 186 # are prefixed with $(CROSS_COMPILE).
 187 # CROSS_COMPILE can be set on the command line
 188 # make CROSS_COMPILE=ia64-linux-
 189 # Alternatively CROSS_COMPILE can be set in the environment.
 190 # Default value for CROSS_COMPILE is not to prefix executables
 191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192 export KBUILD_BUILDHOST := $(SUBARCH)
 193 ARCH            ?= $(SUBARCH)
 194 CROSS_COMPILE   ?=
 195
 196 # Architecture as present in compile.h
 197 UTS_MACHINE     := $(ARCH)
 198 SRCARCH         := $(ARCH)
 199
 200 # Additional ARCH settings for x86
 201 ifeq ($(ARCH),i386)
 202         SRCARCH := x86
 203 endif
 204 ifeq ($(ARCH),x86_64)
 205         SRCARCH := x86
 206 endif
 207
 208 # Additional ARCH settings for sparc
 209 ifeq ($(ARCH),sparc64)
 210        SRCARCH := sparc
 211 endif
 212
 213 # Additional ARCH settings for sh
 214 ifeq ($(ARCH),sh64)
 215        SRCARCH := sh
 216 endif
 217
 218 # Where to locate arch specific headers
 219 hdr-arch  := $(SRCARCH)
 220
 221 ifeq ($(ARCH),m68knommu)
 222        hdr-arch  := m68k
 223 endif
 224
 225 KCONFIG_CONFIG  ?= .config
 226
 227 # SHELL used by kbuild
 228 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 229           else if [ -x /bin/bash ]; then echo /bin/bash; \
 230           else echo sh; fi ; fi)
 231
 232 HOSTCC       = gcc
 233 HOSTCXX      = g++
 234 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 235 HOSTCXXFLAGS = -O2
 236
 237 # Decide whether to build built-in, modular, or both.
 238 # Normally, just do built-in.
 239
 240 KBUILD_MODULES :=
 241 KBUILD_BUILTIN := 1
 242
 243 #       If we have only "make modules", don't compile built-in objects.
 244 #       When we're building modules with modversions, we need to consider
 245 #       the built-in objects during the descend as well, in order to
 246 #       make sure the checksums are up to date before we record them.
 247
 248 ifeq ($(MAKECMDGOALS),modules)
 249   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 250 endif
 251
 252 #       If we have "make <whatever> modules", compile modules
 253 #       in addition to whatever we do anyway.
 254 #       Just "make" or "make all" shall build modules as well
 255
 256 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 257   KBUILD_MODULES := 1
 258 endif
 259
 260 ifeq ($(MAKECMDGOALS),)
 261   KBUILD_MODULES := 1
 262 endif
 263
 264 export KBUILD_MODULES KBUILD_BUILTIN
 265 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 266
 267 # Beautify output
 268 # ---------------------------------------------------------------------------
 269 #
 270 # Normally, we echo the whole command before executing it. By making
 271 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 272 # $(quiet) to choose other forms of output instead, e.g.
 273 #
 274 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 275 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 276 #
 277 # If $(quiet) is empty, the whole command will be printed.
 278 # If it is set to "quiet_", only the short version will be printed.
 279 # If it is set to "silent_", nothing will be printed at all, since
 280 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 281 #
 282 # A simple variant is to prefix commands with $(Q) - that's useful
 283 # for commands that shall be hidden in non-verbose mode.
 284 #
 285 #       $(Q)ln $@ :<
 286 #
 287 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 288 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 289
 290 ifeq ($(KBUILD_VERBOSE),1)
 291   quiet =
 292   Q =
 293 else
 294   quiet=quiet_
 295   Q = @
 296 endif
 297
 298 # If the user is running make -s (silent mode), suppress echoing of
 299 # commands
 300
 301 ifneq ($(findstring s,$(MAKEFLAGS)),)
 302   quiet=silent_
 303 endif
 304
 305 export quiet Q KBUILD_VERBOSE
 306
 307
 308 # Look for make include files relative to root of kernel src
 309 MAKEFLAGS += --include-dir=$(srctree)
 310
 311 # We need some generic definitions (do not try to remake the file).
 312 $(srctree)/scripts/Kbuild.include: ;
 313 include $(srctree)/scripts/Kbuild.include
 314
 315 # Make variables (CC, etc...)
 316
 317 AS              = $(CROSS_COMPILE)as
 318 LD              = $(CROSS_COMPILE)ld
 319 CC              = $(CROSS_COMPILE)gcc
 320 CPP             = $(CC) -E
 321 AR              = $(CROSS_COMPILE)ar
 322 NM              = $(CROSS_COMPILE)nm
 323 STRIP           = $(CROSS_COMPILE)strip
 324 OBJCOPY         = $(CROSS_COMPILE)objcopy
 325 OBJDUMP         = $(CROSS_COMPILE)objdump
 326 AWK             = awk
 327 GENKSYMS        = scripts/genksyms/genksyms
 328 DEPMOD          = /sbin/depmod
 329 KALLSYMS        = scripts/kallsyms
 330 PERL            = perl
 331 CHECK           = sparse
 332
 333 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 334                   -Wbitwise -Wno-return-void $(CF)
 335 MODFLAGS        = -DMODULE
 336 CFLAGS_MODULE   = $(MODFLAGS)
 337 AFLAGS_MODULE   = $(MODFLAGS)
 338 LDFLAGS_MODULE  =
 339 CFLAGS_KERNEL   =
 340 AFLAGS_KERNEL   =
 341
 342
 343 # Use LINUXINCLUDE when you must reference the include/ directory.
 344 # Needed to be compatible with the O= option
 345 LINUXINCLUDE    := -Iinclude \
 346                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 347                    -I$(srctree)/arch/$(hdr-arch)/include               \
 348                    -include include/linux/autoconf.h
 349
 350 KBUILD_CPPFLAGS := -D__KERNEL__
 351
 352 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 353                    -fno-strict-aliasing -fno-common \
 354                    -Werror-implicit-function-declaration
 355 KBUILD_AFLAGS   := -D__ASSEMBLY__
 356
 357 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 358 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 359 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 360
 361 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 362 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 363 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 364 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 365
 366 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 367 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 368 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 369
 370 # When compiling out-of-tree modules, put MODVERDIR in the module
 371 # tree rather than in the kernel tree. The kernel tree might
 372 # even be read-only.
 373 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 374
 375 # Files to ignore in find ... statements
 376
 377 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
 378 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 379
 380 # ===========================================================================
 381 # Rules shared between *config targets and build targets
 382
 383 # Basic helpers built in scripts/
 384 PHONY += scripts_basic
 385 scripts_basic:
 386         $(Q)$(MAKE) $(build)=scripts/basic
 387
 388 # To avoid any implicit rule to kick in, define an empty command.
 389 scripts/basic/%: scripts_basic ;
 390
 391 PHONY += outputmakefile
 392 # outputmakefile generates a Makefile in the output directory, if using a
 393 # separate output directory. This allows convenient use of make in the
 394 # output directory.
 395 outputmakefile:
 396 ifneq ($(KBUILD_SRC),)
 397         $(Q)ln -fsn $(srctree) source
 398         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 399             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 400 endif
 401
 402 # To make sure we do not include .config for any of the *config targets
 403 # catch them early, and hand them over to scripts/kconfig/Makefile
 404 # It is allowed to specify more targets when calling make, including
 405 # mixing *config targets and build targets.
 406 # For example 'make oldconfig all'.
 407 # Detect when mixed targets is specified, and make a second invocation
 408 # of make so .config is not included in this case either (for *config).
 409
 410 no-dot-config-targets := clean mrproper distclean \
 411                          cscope TAGS tags help %docs check% \
 412                          include/linux/version.h headers_% \
 413                          kernelrelease kernelversion
 414
 415 config-targets := 0
 416 mixed-targets  := 0
 417 dot-config     := 1
 418
 419 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 420         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 421                 dot-config := 0
 422         endif
 423 endif
 424
 425 ifeq ($(KBUILD_EXTMOD),)
 426         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 427                 config-targets := 1
 428                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 429                         mixed-targets := 1
 430                 endif
 431         endif
 432 endif
 433
 434 ifeq ($(mixed-targets),1)
 435 # ===========================================================================
 436 # We're called with mixed targets (*config and build targets).
 437 # Handle them one by one.
 438
 439 %:: FORCE
 440         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 441
 442 else
 443 ifeq ($(config-targets),1)
 444 # ===========================================================================
 445 # *config targets only - make sure prerequisites are updated, and descend
 446 # in scripts/kconfig to make the *config target
 447
 448 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 449 # KBUILD_DEFCONFIG may point out an alternative default configuration
 450 # used for 'make defconfig'
 451 include $(srctree)/arch/$(SRCARCH)/Makefile
 452 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 453
 454 config: scripts_basic outputmakefile FORCE
 455         $(Q)mkdir -p include/linux include/config
 456         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 457
 458 %config: scripts_basic outputmakefile FORCE
 459         $(Q)mkdir -p include/linux include/config
 460         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 461
 462 else
 463 # ===========================================================================
 464 # Build targets only - this includes vmlinux, arch specific targets, clean
 465 # targets and others. In general all targets except *config targets.
 466
 467 ifeq ($(KBUILD_EXTMOD),)
 468 # Additional helpers built in scripts/
 469 # Carefully list dependencies so we do not try to build scripts twice
 470 # in parallel
 471 PHONY += scripts
 472 scripts: scripts_basic include/config/auto.conf
 473         $(Q)$(MAKE) $(build)=$(@)
 474
 475 # Objects we will link into vmlinux / subdirs we need to visit
 476 init-y          := init/
 477 drivers-y       := drivers/ sound/ firmware/
 478 net-y           := net/
 479 libs-y          := lib/
 480 core-y          := usr/
 481 endif # KBUILD_EXTMOD
 482
 483 ifeq ($(dot-config),1)
 484 # Read in config
 485 -include include/config/auto.conf
 486
 487 ifeq ($(KBUILD_EXTMOD),)
 488 # Read in dependencies to all Kconfig* files, make sure to run
 489 # oldconfig if changes are detected.
 490 -include include/config/auto.conf.cmd
 491
 492 # To avoid any implicit rule to kick in, define an empty command
 493 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 494
 495 # If .config is newer than include/config/auto.conf, someone tinkered
 496 # with it and forgot to run make oldconfig.
 497 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 498 # we execute the config step to be sure to catch updated Kconfig files
 499 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 500         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 501 else
 502 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 503 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 504 PHONY += include/config/auto.conf
 505
 506 include/config/auto.conf:
 507         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 508         echo;                                                           \
 509         echo "  ERROR: Kernel configuration is invalid.";               \
 510         echo "         include/linux/autoconf.h or $@ are missing.";    \
 511         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 512         echo;                                                           \
 513         /bin/false)
 514
 515 endif # KBUILD_EXTMOD
 516
 517 else
 518 # Dummy target needed, because used as prerequisite
 519 include/config/auto.conf: ;
 520 endif # $(dot-config)
 521
 522 # The all: target is the default when no target is given on the
 523 # command line.
 524 # This allow a user to issue only 'make' to build a kernel including modules
 525 # Defaults vmlinux but it is usually overridden in the arch makefile
 526 all: vmlinux
 527
 528 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 529 KBUILD_CFLAGS   += -Os
 530 else
 531 KBUILD_CFLAGS   += -O2
 532 endif
 533
 534 include $(srctree)/arch/$(SRCARCH)/Makefile
 535
 536 ifneq (CONFIG_FRAME_WARN,0)
 537 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 538 endif
 539
 540 # Force gcc to behave correct even for buggy distributions
 541 ifndef CONFIG_CC_STACKPROTECTOR
 542 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 543 endif
 544
 545 ifdef CONFIG_FRAME_POINTER
 546 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 547 else
 548 KBUILD_CFLAGS   += -fomit-frame-pointer
 549 endif
 550
 551 ifdef CONFIG_DEBUG_INFO
 552 KBUILD_CFLAGS   += -g
 553 KBUILD_AFLAGS   += -gdwarf-2
 554 endif
 555
 556 ifdef CONFIG_FUNCTION_TRACER
 557 KBUILD_CFLAGS   += -pg
 558 endif
 559
 560 # We trigger additional mismatches with less inlining
 561 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 562 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 563 endif
 564
 565 # arch Makefile may override CC so keep this after arch Makefile is included
 566 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 567 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 568
 569 # warn about C99 declaration after statement
 570 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 571
 572 # disable pointer signed / unsigned warnings in gcc 4.0
 573 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 574
 575 # disable invalid "can't wrap" optimizations for signed / pointers
 576 KBUILD_CFLAGS   += $(call cc-option,-fwrapv)
 577
 578 # revert to pre-gcc-4.4 behaviour of .eh_frame
 579 KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 580
 581 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 582 # But warn user when we do so
 583 warn-assign = \
 584 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 585
 586 ifneq ($(KCPPFLAGS),)
 587         $(call warn-assign,CPPFLAGS)
 588         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 589 endif
 590 ifneq ($(KAFLAGS),)
 591         $(call warn-assign,AFLAGS)
 592         KBUILD_AFLAGS += $(KAFLAGS)
 593 endif
 594 ifneq ($(KCFLAGS),)
 595         $(call warn-assign,CFLAGS)
 596         KBUILD_CFLAGS += $(KCFLAGS)
 597 endif
 598
 599 # Use --build-id when available.
 600 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 601                               $(call ld-option, -Wl$(comma)--build-id,))
 602 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 603 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 604
 605 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 606 LDFLAGS_vmlinux += -X
 607 endif
 608
 609 # Default kernel image to build when no specific target is given.
 610 # KBUILD_IMAGE may be overruled on the command line or
 611 # set in the environment
 612 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 613 # this default value
 614 export KBUILD_IMAGE ?= vmlinux
 615
 616 #
 617 # INSTALL_PATH specifies where to place the updated kernel and system map
 618 # images. Default is /boot, but you can set it to other values
 619 export  INSTALL_PATH ?= /boot
 620
 621 #
 622 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 623 # relocations required by build roots.  This is not defined in the
 624 # makefile but the argument can be passed to make if needed.
 625 #
 626
 627 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 628 export MODLIB
 629
 630 #
 631 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 632 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 633 #  the default option --strip-debug will be used.  Otherwise,
 634 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 635
 636 ifdef INSTALL_MOD_STRIP
 637 ifeq ($(INSTALL_MOD_STRIP),1)
 638 mod_strip_cmd = $(STRIP) --strip-debug
 639 else
 640 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 641 endif # INSTALL_MOD_STRIP=1
 642 else
 643 mod_strip_cmd = true
 644 endif # INSTALL_MOD_STRIP
 645 export mod_strip_cmd
 646
 647
 648 ifeq ($(KBUILD_EXTMOD),)
 649 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 650
 651 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 652                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 653                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 654
 655 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 656                      $(init-n) $(init-) \
 657                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 658                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 659
 660 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 661 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 662 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 663 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 664 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 665 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 666 libs-y          := $(libs-y1) $(libs-y2)
 667
 668 # Build vmlinux
 669 # ---------------------------------------------------------------------------
 670 # vmlinux is built from the objects selected by $(vmlinux-init) and
 671 # $(vmlinux-main). Most are built-in.o files from top-level directories
 672 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 673 # Ordering when linking is important, and $(vmlinux-init) must be first.
 674 #
 675 # vmlinux
 676 #   ^
 677 #   |
 678 #   +-< $(vmlinux-init)
 679 #   |   +--< init/version.o + more
 680 #   |
 681 #   +--< $(vmlinux-main)
 682 #   |    +--< driver/built-in.o mm/built-in.o + more
 683 #   |
 684 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 685 #
 686 # vmlinux version (uname -v) cannot be updated during normal
 687 # descending-into-subdirs phase since we do not yet know if we need to
 688 # update vmlinux.
 689 # Therefore this step is delayed until just before final link of vmlinux -
 690 # except in the kallsyms case where it is done just before adding the
 691 # symbols to the kernel.
 692 #
 693 # System.map is generated to document addresses of all kernel symbols
 694
 695 vmlinux-init := $(head-y) $(init-y)
 696 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 697 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 698 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 699 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 700
 701 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 702 # May be overridden by arch/$(ARCH)/Makefile
 703 quiet_cmd_vmlinux__ ?= LD      $@
 704       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 705       -T $(vmlinux-lds) $(vmlinux-init)                          \
 706       --start-group $(vmlinux-main) --end-group                  \
 707       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 708
 709 # Generate new vmlinux version
 710 quiet_cmd_vmlinux_version = GEN     .version
 711       cmd_vmlinux_version = set -e;                     \
 712         if [ ! -r .version ]; then                      \
 713           rm -f .version;                               \
 714           echo 1 >.version;                             \
 715         else                                            \
 716           mv .version .old_version;                     \
 717           expr 0$$(cat .old_version) + 1 >.version;     \
 718         fi;                                             \
 719         $(MAKE) $(build)=init
 720
 721 # Generate System.map
 722 quiet_cmd_sysmap = SYSMAP
 723       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 724
 725 # Link of vmlinux
 726 # If CONFIG_KALLSYMS is set .version is already updated
 727 # Generate System.map and verify that the content is consistent
 728 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 729 # First command is ':' to allow us to use + in front of the rule
 730 define rule_vmlinux__
 731         :
 732         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 733
 734         $(call cmd,vmlinux__)
 735         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 736
 737         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 738           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 739         $(cmd_sysmap) $@ System.map;                                         \
 740         if [ $$? -ne 0 ]; then                                               \
 741                 rm -f $@;                                                    \
 742                 /bin/false;                                                  \
 743         fi;
 744         $(verify_kallsyms)
 745 endef
 746
 747
 748 ifdef CONFIG_KALLSYMS
 749 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 750 # It's a three stage process:
 751 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 752 #   empty
 753 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 754 #   the right size - vmlinux version (uname -v) is updated during this step
 755 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 756 #   but due to the added section, some addresses have shifted.
 757 #   From here, we generate a correct .tmp_kallsyms2.o
 758 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 759 # o Verify that the System.map from vmlinux matches the map from
 760 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 761 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 762 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 763 #   temporary bypass to allow the kernel to be built while the
 764 #   maintainers work out what went wrong with kallsyms.
 765
 766 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 767 last_kallsyms := 3
 768 else
 769 last_kallsyms := 2
 770 endif
 771
 772 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 773
 774 define verify_kallsyms
 775         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 776           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 777           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 778         $(Q)cmp -s System.map .tmp_System.map ||                             \
 779                 (echo Inconsistent kallsyms data;                            \
 780                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 781                  rm .tmp_kallsyms* ; /bin/false )
 782 endef
 783
 784 # Update vmlinux version before link
 785 # Use + in front of this rule to silent warning about make -j1
 786 # First command is ':' to allow us to use + in front of this rule
 787 cmd_ksym_ld = $(cmd_vmlinux__)
 788 define rule_ksym_ld
 789         :
 790         +$(call cmd,vmlinux_version)
 791         $(call cmd,vmlinux__)
 792         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 793 endef
 794
 795 # Generate .S file with all kernel symbols
 796 quiet_cmd_kallsyms = KSYM    $@
 797       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 798                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 799
 800 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 801         $(call if_changed_dep,as_o_S)
 802
 803 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 804         $(call cmd,kallsyms)
 805
 806 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 807 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 808         $(call if_changed_rule,ksym_ld)
 809
 810 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 811         $(call if_changed,vmlinux__)
 812
 813 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 814         $(call if_changed,vmlinux__)
 815
 816 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 817 $(KALLSYMS): scripts ;
 818
 819 # Generate some data for debugging strange kallsyms problems
 820 debug_kallsyms: .tmp_map$(last_kallsyms)
 821
 822 .tmp_map%: .tmp_vmlinux% FORCE
 823         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 824
 825 .tmp_map3: .tmp_map2
 826
 827 .tmp_map2: .tmp_map1
 828
 829 endif # ifdef CONFIG_KALLSYMS
 830
 831 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 832 # relevant sections renamed as per the linker script.
 833 quiet_cmd_vmlinux-modpost = LD      $@
 834       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 835          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 836          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 837 define rule_vmlinux-modpost
 838         :
 839         +$(call cmd,vmlinux-modpost)
 840         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 841         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 842 endef
 843
 844 # vmlinux image - including updated kernel symbols
 845 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 846 ifdef CONFIG_HEADERS_CHECK
 847         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 848 endif
 849 ifdef CONFIG_SAMPLES
 850         $(Q)$(MAKE) $(build)=samples
 851 endif
 852 ifdef CONFIG_BUILD_DOCSRC
 853         $(Q)$(MAKE) $(build)=Documentation
 854 endif
 855         $(call vmlinux-modpost)
 856         $(call if_changed_rule,vmlinux__)
 857         $(Q)rm -f .old_version
 858
 859 # build vmlinux.o first to catch section mismatch errors early
 860 ifdef CONFIG_KALLSYMS
 861 .tmp_vmlinux1: vmlinux.o
 862 endif
 863
 864 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 865 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 866         $(call if_changed_rule,vmlinux-modpost)
 867
 868 # The actual objects are generated when descending,
 869 # make sure no implicit rule kicks in
 870 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 871
 872 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 873 # Preset locale variables to speed up the build process. Limit locale
 874 # tweaks to this spot to avoid wrong language settings when running
 875 # make menuconfig etc.
 876 # Error messages still appears in the original language
 877
 878 PHONY += $(vmlinux-dirs)
 879 $(vmlinux-dirs): prepare scripts
 880         $(Q)$(MAKE) $(build)=$@
 881
 882 # Build the kernel release string
 883 #
 884 # The KERNELRELEASE value built here is stored in the file
 885 # include/config/kernel.release, and is used when executing several
 886 # make targets, such as "make install" or "make modules_install."
 887 #
 888 # The eventual kernel release string consists of the following fields,
 889 # shown in a hierarchical format to show how smaller parts are concatenated
 890 # to form the larger and final value, with values coming from places like
 891 # the Makefile, kernel config options, make command line options and/or
 892 # SCM tag information.
 893 #
 894 #       $(KERNELVERSION)
 895 #         $(VERSION)                    eg, 2
 896 #         $(PATCHLEVEL)                 eg, 6
 897 #         $(SUBLEVEL)                   eg, 18
 898 #         $(EXTRAVERSION)               eg, -rc6
 899 #       $(localver-full)
 900 #         $(localver)
 901 #           localversion*               (files without backups, containing '~')
 902 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 903 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 904 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 905 #           $(LOCALVERSION)             (from make command line if provided)
 906 #
 907 #  Note how the final $(localver-auto) string is included *only* if the
 908 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 909 # moment, only git is supported but other SCMs can edit the script
 910 # scripts/setlocalversion and add the appropriate checks as needed.
 911
 912 pattern = ".*/localversion[^~]*"
 913 string  = $(shell cat /dev/null \
 914            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 915
 916 localver = $(subst $(space),, $(string) \
 917                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 918
 919 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 920 # and if the SCM is know a tag from the SCM is appended.
 921 # The appended tag is determined by the SCM used.
 922 #
 923 # .scmversion is used when generating rpm packages so we do not loose
 924 # the version information from the SCM when we do the build of the kernel
 925 # from the copied source
 926 ifdef CONFIG_LOCALVERSION_AUTO
 927
 928 ifeq ($(wildcard .scmversion),)
 929         _localver-auto = $(shell $(CONFIG_SHELL) \
 930                          $(srctree)/scripts/setlocalversion $(srctree))
 931 else
 932         _localver-auto = $(shell cat .scmversion 2> /dev/null)
 933 endif
 934
 935         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 936 endif
 937
 938 localver-full = $(localver)$(localver-auto)
 939
 940 # Store (new) KERNELRELASE string in include/config/kernel.release
 941 kernelrelease = $(KERNELVERSION)$(localver-full)
 942 include/config/kernel.release: include/config/auto.conf FORCE
 943         $(Q)rm -f $@
 944         $(Q)echo $(kernelrelease) > $@
 945
 946
 947 # Things we need to do before we recursively start building the kernel
 948 # or the modules are listed in "prepare".
 949 # A multi level approach is used. prepareN is processed before prepareN-1.
 950 # archprepare is used in arch Makefiles and when processed asm symlink,
 951 # version.h and scripts_basic is processed / created.
 952
 953 # Listed in dependency order
 954 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 955
 956 # prepare3 is used to check if we are building in a separate output directory,
 957 # and if so do:
 958 # 1) Check that make has not been executed in the kernel src $(srctree)
 959 # 2) Create the include2 directory, used for the second asm symlink
 960 prepare3: include/config/kernel.release
 961 ifneq ($(KBUILD_SRC),)
 962         @$(kecho) '  Using $(srctree) as source for kernel'
 963         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 964                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 965                 echo "  in the '$(srctree)' directory.";\
 966                 /bin/false; \
 967         fi;
 968         $(Q)if [ ! -d include2 ]; then                                  \
 969             mkdir -p include2;                                          \
 970             ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 971         fi
 972 endif
 973
 974 # prepare2 creates a makefile if using a separate output directory
 975 prepare2: prepare3 outputmakefile
 976
 977 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 978                    include/asm include/config/auto.conf
 979         $(cmd_crmodverdir)
 980
 981 archprepare: prepare1 scripts_basic
 982
 983 prepare0: archprepare FORCE
 984         $(Q)$(MAKE) $(build)=.
 985         $(Q)$(MAKE) $(build)=. missing-syscalls
 986
 987 # All the preparing..
 988 prepare: prepare0
 989
 990 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 991 # done in arch/$(ARCH)/kernel/Makefile
 992
 993 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 994
 995 # The asm symlink changes when $(ARCH) changes.
 996 # Detect this and ask user to run make mrproper
 997 # If asm is a stale symlink (point to dir that does not exist) remove it
 998 define check-symlink
 999         set -e;                                                            \
1000         if [ -L include/asm ]; then                                        \
1001                 asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
1002                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
1003                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1004                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
1005                         exit 1;                                            \
1006                 fi;                                                        \
1007                 test -e $$asmlink || rm include/asm;                       \
1008         elif [ -d include/asm ]; then                                      \
1009                 echo "ERROR: $@ is a directory but a symlink was expected";\
1010                 exit 1;                                                    \
1011         fi
1012 endef
1013
1014 # We create the target directory of the symlink if it does
1015 # not exist so the test in check-symlink works and we have a
1016 # directory for generated filesas used by some architectures.
1017 define create-symlink
1018         if [ ! -L include/asm ]; then                                      \
1019                         $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1020                         if [ ! -d include/asm-$(SRCARCH) ]; then           \
1021                                 mkdir -p include/asm-$(SRCARCH);           \
1022                         fi;                                                \
1023                         ln -fsn asm-$(SRCARCH) $@;                         \
1024         fi
1025 endef
1026
1027 include/asm: FORCE
1028         $(Q)$(check-symlink)
1029         $(Q)$(create-symlink)
1030
1031 # Generate some files
1032 # ---------------------------------------------------------------------------
1033
1034 # KERNELRELEASE can change from a few different places, meaning version.h
1035 # needs to be updated, so this check is forced on all builds
1036
1037 uts_len := 64
1038 define filechk_utsrelease.h
1039         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1040           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1041           exit 1;                                                         \
1042         fi;                                                               \
1043         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1044 endef
1045
1046 define filechk_version.h
1047         (echo \#define LINUX_VERSION_CODE $(shell                             \
1048         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1049         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1050 endef
1051
1052 include/linux/version.h: $(srctree)/Makefile FORCE
1053         $(call filechk,version.h)
1054
1055 include/linux/utsrelease.h: include/config/kernel.release FORCE
1056         $(call filechk,utsrelease.h)
1057
1058 PHONY += headerdep
1059 headerdep:
1060         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1061
1062 # ---------------------------------------------------------------------------
1063
1064 PHONY += depend dep
1065 depend dep:
1066         @echo '*** Warning: make $@ is unnecessary now.'
1067
1068 # ---------------------------------------------------------------------------
1069 # Firmware install
1070 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1071 export INSTALL_FW_PATH
1072
1073 PHONY += firmware_install
1074 firmware_install: FORCE
1075         @mkdir -p $(objtree)/firmware
1076         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1077
1078 # ---------------------------------------------------------------------------
1079 # Kernel headers
1080
1081 #Default location for installed headers
1082 export INSTALL_HDR_PATH = $(objtree)/usr
1083
1084 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1085 # Find out where the Kbuild file is located to support
1086 # arch/$(ARCH)/include/asm
1087 hdr-dir = $(strip                                                         \
1088           $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1089                arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1090
1091 # If we do an all arch process set dst to asm-$(hdr-arch)
1092 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1093
1094 PHONY += __headers
1095 __headers: include/linux/version.h scripts_basic FORCE
1096         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1097
1098 PHONY += headers_install_all
1099 headers_install_all:
1100         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1101
1102 PHONY += headers_install
1103 headers_install: __headers
1104         $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1105         $(error Headers not exportable for the $(SRCARCH) architecture))
1106         $(Q)$(MAKE) $(hdr-inst)=include
1107         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1108
1109 PHONY += headers_check_all
1110 headers_check_all: headers_install_all
1111         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1112
1113 PHONY += headers_check
1114 headers_check: headers_install
1115         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1116         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1117
1118 # ---------------------------------------------------------------------------
1119 # Modules
1120
1121 ifdef CONFIG_MODULES
1122
1123 # By default, build modules as well
1124
1125 all: modules
1126
1127 #       Build modules
1128 #
1129 #       A module can be listed more than once in obj-m resulting in
1130 #       duplicate lines in modules.order files.  Those are removed
1131 #       using awk while concatenating to the final file.
1132
1133 PHONY += modules
1134 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1135         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1136         @$(kecho) '  Building modules, stage 2.';
1137         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1138         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1139
1140
1141 # Target to prepare building external modules
1142 PHONY += modules_prepare
1143 modules_prepare: prepare scripts
1144
1145 # Target to install modules
1146 PHONY += modules_install
1147 modules_install: _modinst_ _modinst_post
1148
1149 PHONY += _modinst_
1150 _modinst_:
1151         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1152                 echo "Warning: you may need to install module-init-tools"; \
1153                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1154                 sleep 1; \
1155         fi
1156         @rm -rf $(MODLIB)/kernel
1157         @rm -f $(MODLIB)/source
1158         @mkdir -p $(MODLIB)/kernel
1159         @ln -s $(srctree) $(MODLIB)/source
1160         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1161                 rm -f $(MODLIB)/build ; \
1162                 ln -s $(objtree) $(MODLIB)/build ; \
1163         fi
1164         @cp -f $(objtree)/modules.order $(MODLIB)/
1165         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1166
1167 # This depmod is only for convenience to give the initial
1168 # boot a modules.dep even before / is mounted read-write.  However the
1169 # boot script depmod is the master version.
1170 PHONY += _modinst_post
1171 _modinst_post: _modinst_
1172         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1173         $(call cmd,depmod)
1174
1175 else # CONFIG_MODULES
1176
1177 # Modules not configured
1178 # ---------------------------------------------------------------------------
1179
1180 modules modules_install: FORCE
1181         @echo
1182         @echo "The present kernel configuration has modules disabled."
1183         @echo "Type 'make config' and enable loadable module support."
1184         @echo "Then build a kernel with module support enabled."
1185         @echo
1186         @exit 1
1187
1188 endif # CONFIG_MODULES
1189
1190 ###
1191 # Cleaning is done on three levels.
1192 # make clean     Delete most generated files
1193 #                Leave enough to build external modules
1194 # make mrproper  Delete the current configuration, and all generated files
1195 # make distclean Remove editor backup files, patch leftover files and the like
1196
1197 # Directories & files removed with 'make clean'
1198 CLEAN_DIRS  += $(MODVERDIR)
1199 CLEAN_FILES +=  vmlinux System.map \
1200                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1201
1202 # Directories & files removed with 'make mrproper'
1203 MRPROPER_DIRS  += include/config include2 usr/include include/generated
1204 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1205                   include/linux/autoconf.h include/linux/version.h      \
1206                   include/linux/utsrelease.h                            \
1207                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1208                   Module.symvers Module.markers tags TAGS cscope*
1209
1210 # clean - Delete most, but leave enough to build external modules
1211 #
1212 clean: rm-dirs  := $(CLEAN_DIRS)
1213 clean: rm-files := $(CLEAN_FILES)
1214 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1215
1216 PHONY += $(clean-dirs) clean archclean
1217 $(clean-dirs):
1218         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1219
1220 clean: archclean $(clean-dirs)
1221         $(call cmd,rmdirs)
1222         $(call cmd,rmfiles)
1223         @find . $(RCS_FIND_IGNORE) \
1224                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1225                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1226                 -o -name '*.symtypes' -o -name 'modules.order' \
1227                 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1228                 -type f -print | xargs rm -f
1229
1230 # mrproper - Delete all generated files, including .config
1231 #
1232 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1233 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1234 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1235
1236 PHONY += $(mrproper-dirs) mrproper archmrproper
1237 $(mrproper-dirs):
1238         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1239
1240 mrproper: clean archmrproper $(mrproper-dirs)
1241         $(call cmd,rmdirs)
1242         $(call cmd,rmfiles)
1243
1244 # distclean
1245 #
1246 PHONY += distclean
1247
1248 distclean: mrproper
1249         @find $(srctree) $(RCS_FIND_IGNORE) \
1250                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1251                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1252                 -o -name '.*.rej' -o -size 0 \
1253                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1254                 -type f -print | xargs rm -f
1255
1256
1257 # Packaging of the kernel to various formats
1258 # ---------------------------------------------------------------------------
1259 # rpm target kept for backward compatibility
1260 package-dir     := $(srctree)/scripts/package
1261
1262 %pkg: include/config/kernel.release FORCE
1263         $(Q)$(MAKE) $(build)=$(package-dir) $@
1264 rpm: include/config/kernel.release FORCE
1265         $(Q)$(MAKE) $(build)=$(package-dir) $@
1266
1267
1268 # Brief documentation of the typical targets used
1269 # ---------------------------------------------------------------------------
1270
1271 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1272 boards := $(notdir $(boards))
1273 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1274 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1275
1276 help:
1277         @echo  'Cleaning targets:'
1278         @echo  '  clean           - Remove most generated files but keep the config and'
1279         @echo  '                    enough build support to build external modules'
1280         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1281         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1282         @echo  ''
1283         @echo  'Configuration targets:'
1284         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1285         @echo  ''
1286         @echo  'Other generic targets:'
1287         @echo  '  all             - Build all targets marked with [*]'
1288         @echo  '* vmlinux         - Build the bare kernel'
1289         @echo  '* modules         - Build all modules'
1290         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1291         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1292         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1293         @echo  '  dir/            - Build all files in dir and below'
1294         @echo  '  dir/file.[ois]  - Build specified target only'
1295         @echo  '  dir/file.ko     - Build module including final link'
1296         @echo  '  modules_prepare - Set up for building external modules'
1297         @echo  '  tags/TAGS       - Generate tags file for editors'
1298         @echo  '  cscope          - Generate cscope index'
1299         @echo  '  kernelrelease   - Output the release version string'
1300         @echo  '  kernelversion   - Output the version stored in Makefile'
1301         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1302          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1303          echo  ''
1304         @echo  'Static analysers'
1305         @echo  '  checkstack      - Generate a list of stack hogs'
1306         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1307         @echo  '  versioncheck    - Sanity check on version.h usage'
1308         @echo  '  includecheck    - Check for duplicate included header files'
1309         @echo  '  export_report   - List the usages of all exported symbols'
1310         @echo  '  headers_check   - Sanity check on exported headers'
1311         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1312          echo  ''
1313         @echo  'Kernel packaging:'
1314         @$(MAKE) $(build)=$(package-dir) help
1315         @echo  ''
1316         @echo  'Documentation targets:'
1317         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1318         @echo  ''
1319         @echo  'Architecture specific targets ($(SRCARCH)):'
1320         @$(if $(archhelp),$(archhelp),\
1321                 echo '  No architecture specific help defined for $(SRCARCH)')
1322         @echo  ''
1323         @$(if $(boards), \
1324                 $(foreach b, $(boards), \
1325                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1326                 echo '')
1327         @$(if $(board-dirs), \
1328                 $(foreach b, $(board-dirs), \
1329                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1330                 printf "  %-16s - Show all of the above\\n" help-boards; \
1331                 echo '')
1332
1333         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1334         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1335         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1336         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1337         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1338         @echo  ''
1339         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1340         @echo  'For further info see the ./README file'
1341
1342
1343 help-board-dirs := $(addprefix help-,$(board-dirs))
1344
1345 help-boards: $(help-board-dirs)
1346
1347 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1348
1349 $(help-board-dirs): help-%:
1350         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1351         @$(if $(boards-per-dir), \
1352                 $(foreach b, $(boards-per-dir), \
1353                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1354                 echo '')
1355
1356
1357 # Documentation targets
1358 # ---------------------------------------------------------------------------
1359 %docs: scripts_basic FORCE
1360         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1361
1362 else # KBUILD_EXTMOD
1363
1364 ###
1365 # External module support.
1366 # When building external modules the kernel used as basis is considered
1367 # read-only, and no consistency checks are made and the make
1368 # system is not used on the basis kernel. If updates are required
1369 # in the basis kernel ordinary make commands (without M=...) must
1370 # be used.
1371 #
1372 # The following are the only valid targets when building external
1373 # modules.
1374 # make M=dir clean     Delete all automatically generated files
1375 # make M=dir modules   Make all modules in specified dir
1376 # make M=dir           Same as 'make M=dir modules'
1377 # make M=dir modules_install
1378 #                      Install the modules built in the module directory
1379 #                      Assumes install directory is already created
1380
1381 # We are always building modules
1382 KBUILD_MODULES := 1
1383 PHONY += crmodverdir
1384 crmodverdir:
1385         $(cmd_crmodverdir)
1386
1387 PHONY += $(objtree)/Module.symvers
1388 $(objtree)/Module.symvers:
1389         @test -e $(objtree)/Module.symvers || ( \
1390         echo; \
1391         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1392         echo "           is missing; modules will have no dependencies and modversions."; \
1393         echo )
1394
1395 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1396 PHONY += $(module-dirs) modules
1397 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1398         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1399
1400 modules: $(module-dirs)
1401         @$(kecho) '  Building modules, stage 2.';
1402         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1403
1404 PHONY += modules_install
1405 modules_install: _emodinst_ _emodinst_post
1406
1407 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1408 PHONY += _emodinst_
1409 _emodinst_:
1410         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1411         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1412
1413 PHONY += _emodinst_post
1414 _emodinst_post: _emodinst_
1415         $(call cmd,depmod)
1416
1417 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1418
1419 PHONY += $(clean-dirs) clean
1420 $(clean-dirs):
1421         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1422
1423 clean:  rm-dirs := $(MODVERDIR)
1424 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1425                    $(KBUILD_EXTMOD)/Module.markers \
1426                    $(KBUILD_EXTMOD)/modules.order
1427 clean: $(clean-dirs)
1428         $(call cmd,rmdirs)
1429         $(call cmd,rmfiles)
1430         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1431                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1432                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1433                 -type f -print | xargs rm -f
1434
1435 help:
1436         @echo  '  Building external modules.'
1437         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1438         @echo  ''
1439         @echo  '  modules         - default target, build the module(s)'
1440         @echo  '  modules_install - install the module'
1441         @echo  '  clean           - remove generated files in module directory only'
1442         @echo  ''
1443
1444 # Dummies...
1445 PHONY += prepare scripts
1446 prepare: ;
1447 scripts: ;
1448 endif # KBUILD_EXTMOD
1449
1450 # Generate tags for editors
1451 # ---------------------------------------------------------------------------
1452 quiet_cmd_tags = GEN     $@
1453       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1454
1455 tags TAGS cscope: FORCE
1456         $(call cmd,tags)
1457
1458 # Scripts to check various things for consistency
1459 # ---------------------------------------------------------------------------
1460
1461 includecheck:
1462         find * $(RCS_FIND_IGNORE) \
1463                 -name '*.[hcS]' -type f -print | sort \
1464                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1465
1466 versioncheck:
1467         find * $(RCS_FIND_IGNORE) \
1468                 -name '*.[hcS]' -type f -print | sort \
1469                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1470
1471 namespacecheck:
1472         $(PERL) $(srctree)/scripts/namespace.pl
1473
1474 export_report:
1475         $(PERL) $(srctree)/scripts/export_report.pl
1476
1477 endif #ifeq ($(config-targets),1)
1478 endif #ifeq ($(mixed-targets),1)
1479
1480 PHONY += checkstack kernelrelease kernelversion
1481
1482 # UML needs a little special treatment here.  It wants to use the host
1483 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1484 # else wants $(ARCH), including people doing cross-builds, which means
1485 # that $(SUBARCH) doesn't work here.
1486 ifeq ($(ARCH), um)
1487 CHECKSTACK_ARCH := $(SUBARCH)
1488 else
1489 CHECKSTACK_ARCH := $(ARCH)
1490 endif
1491 checkstack:
1492         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1493         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1494
1495 kernelrelease:
1496         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1497         $(error kernelrelease not valid - run 'make prepare' to update it))
1498 kernelversion:
1499         @echo $(KERNELVERSION)
1500
1501 # Single targets
1502 # ---------------------------------------------------------------------------
1503 # Single targets are compatible with:
1504 # - build with mixed source and output
1505 # - build with separate output dir 'make O=...'
1506 # - external modules
1507 #
1508 #  target-dir => where to store outputfile
1509 #  build-dir  => directory in kernel source tree to use
1510
1511 ifeq ($(KBUILD_EXTMOD),)
1512         build-dir  = $(patsubst %/,%,$(dir $@))
1513         target-dir = $(dir $@)
1514 else
1515         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1516         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1517         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1518 endif
1519
1520 %.s: %.c prepare scripts FORCE
1521         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1522 %.i: %.c prepare scripts FORCE
1523         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524 %.o: %.c prepare scripts FORCE
1525         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526 %.lst: %.c prepare scripts FORCE
1527         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528 %.s: %.S prepare scripts FORCE
1529         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530 %.o: %.S prepare scripts FORCE
1531         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1532 %.symtypes: %.c prepare scripts FORCE
1533         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1534
1535 # Modules
1536 /: prepare scripts FORCE
1537         $(cmd_crmodverdir)
1538         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1539         $(build)=$(build-dir)
1540 %/: prepare scripts FORCE
1541         $(cmd_crmodverdir)
1542         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1543         $(build)=$(build-dir)
1544 %.ko: prepare scripts FORCE
1545         $(cmd_crmodverdir)
1546         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1547         $(build)=$(build-dir) $(@:.ko=.o)
1548         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1549
1550 # FIXME Should go into a make.lib or something
1551 # ===========================================================================
1552
1553 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1554       cmd_rmdirs = rm -rf $(rm-dirs)
1555
1556 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1557       cmd_rmfiles = rm -f $(rm-files)
1558
1559 # Run depmod only if we have System.map and depmod is executable
1560 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1561       cmd_depmod = \
1562         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1563                 $(DEPMOD) -ae -F System.map                                     \
1564                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1565                 $(KERNELRELEASE);                                               \
1566         fi
1567
1568 # Create temporary dir for module support files
1569 # clean it up only when building all modules
1570 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1571                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1572
1573 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1574           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1575           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1576
1577 quiet_cmd_as_o_S = AS      $@
1578 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1579
1580 # read all saved command lines
1581
1582 targets := $(wildcard $(sort $(targets)))
1583 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1584
1585 ifneq ($(cmd_files),)
1586   $(cmd_files): ;       # Do not try to update included dependency files
1587   include $(cmd_files)
1588 endif
1589
1590 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1591 # Usage:
1592 # $(Q)$(MAKE) $(clean)=dir
1593 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1594
1595 endif   # skip-makefile
1596
1597 PHONY += FORCE
1598 FORCE:
1599
1600 # Declare the contents of the .PHONY variable as phony.  We keep that
1601 # information in a variable so we can use it in if_changed and friends.
1602 .PHONY: $(PHONY)