Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 32
   4 EXTRAVERSION = .48
   5 NAME = Man-Eating Seals of Antiquity
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # Do not:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoids hard-to-debug behaviour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # We are using a recursive build, so we need to do a little thinking
  20 # to get the ordering right.
  21 #
  22 # Most importantly: sub-Makefiles should only ever modify files in
  23 # their own directory. If in some directory we have a dependency on
  24 # a file in another dir (which doesn't happen often, but it's often
  25 # unavoidable when linking the built-in.o targets which finally
  26 # turn into vmlinux), we will call a sub make in that other dir, and
  27 # after that we are sure that everything which is in that other dir
  28 # is now up to date.
  29 #
  30 # The only cases where we need to modify files which have global
  31 # effects are thus separated out and done before the recursive
  32 # descending is started. They are now explicitly listed as the
  33 # prepare rule.
  34
  35 # To put more focus on warnings, be less verbose as default
  36 # Use 'make V=1' to see the full commands
  37
  38 ifeq ("$(origin V)", "command line")
  39   KBUILD_VERBOSE = $(V)
  40 endif
  41 ifndef KBUILD_VERBOSE
  42   KBUILD_VERBOSE = 0
  43 endif
  44
  45 # Call a source code checker (by default, "sparse") as part of the
  46 # C compilation.
  47 #
  48 # Use 'make C=1' to enable checking of only re-compiled files.
  49 # Use 'make C=2' to enable checking of *all* source files, regardless
  50 # of whether they are re-compiled or not.
  51 #
  52 # See the file "Documentation/sparse.txt" for more details, including
  53 # where to get the "sparse" utility.
  54
  55 ifeq ("$(origin C)", "command line")
  56   KBUILD_CHECKSRC = $(C)
  57 endif
  58 ifndef KBUILD_CHECKSRC
  59   KBUILD_CHECKSRC = 0
  60 endif
  61
  62 # Use make M=dir to specify directory of external module to build
  63 # Old syntax make ... SUBDIRS=$PWD is still supported
  64 # Setting the environment variable KBUILD_EXTMOD take precedence
  65 ifdef SUBDIRS
  66   KBUILD_EXTMOD ?= $(SUBDIRS)
  67 endif
  68
  69 ifeq ("$(origin M)", "command line")
  70   KBUILD_EXTMOD := $(M)
  71 endif
  72
  73 # kbuild supports saving output files in a separate directory.
  74 # To locate output files in a separate directory two syntaxes are supported.
  75 # In both cases the working directory must be the root of the kernel src.
  76 # 1) O=
  77 # Use "make O=dir/to/store/output/files/"
  78 #
  79 # 2) Set KBUILD_OUTPUT
  80 # Set the environment variable KBUILD_OUTPUT to point to the directory
  81 # where the output files shall be placed.
  82 # export KBUILD_OUTPUT=dir/to/store/output/files/
  83 # make
  84 #
  85 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  86 # variable.
  87
  88
  89 # KBUILD_SRC is set on invocation of make in OBJ directory
  90 # KBUILD_SRC is not intended to be used by the regular user (for now)
  91 ifeq ($(KBUILD_SRC),)
  92
  93 # OK, Make called in directory where kernel src resides
  94 # Do we want to locate output files in a separate directory?
  95 ifeq ("$(origin O)", "command line")
  96   KBUILD_OUTPUT := $(O)
  97 endif
  98
  99 # That's our default target when none is given on the command line
 100 PHONY := _all
 101 _all:
 102
 103 # Cancel implicit rules on top Makefile
 104 $(CURDIR)/Makefile Makefile: ;
 105
 106 ifneq ($(KBUILD_OUTPUT),)
 107 # Invoke a second make in the output directory, passing relevant variables
 108 # check that the output directory actually exists
 109 saved-output := $(KBUILD_OUTPUT)
 110 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 111 $(if $(KBUILD_OUTPUT),, \
 112      $(error output directory "$(saved-output)" does not exist))
 113
 114 PHONY += $(MAKECMDGOALS) sub-make
 115
 116 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 117         $(Q)@:
 118
 119 sub-make: FORCE
 120         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 121         KBUILD_SRC=$(CURDIR) \
 122         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 123         $(filter-out _all sub-make,$(MAKECMDGOALS))
 124
 125 # Leave processing to above invocation of make
 126 skip-makefile := 1
 127 endif # ifneq ($(KBUILD_OUTPUT),)
 128 endif # ifeq ($(KBUILD_SRC),)
 129
 130 # We process the rest of the Makefile if this is the final invocation of make
 131 ifeq ($(skip-makefile),)
 132
 133 # If building an external module we do not care about the all: rule
 134 # but instead _all depend on modules
 135 PHONY += all
 136 ifeq ($(KBUILD_EXTMOD),)
 137 _all: all
 138 else
 139 _all: modules
 140 endif
 141
 142 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 143 objtree         := $(CURDIR)
 144 src             := $(srctree)
 145 obj             := $(objtree)
 146
 147 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 148
 149 export srctree objtree VPATH
 150
 151
 152 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 153 # first, and if a usermode build is happening, the "ARCH=um" on the command
 154 # line overrides the setting of ARCH below.  If a native build is happening,
 155 # then ARCH is assigned, getting whatever value it gets normally, and
 156 # SUBARCH is subsequently ignored.
 157
 158 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 159                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 160                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 161                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 162                                   -e s/sh[234].*/sh/ )
 163
 164 # Cross compiling and selecting different set of gcc/bin-utils
 165 # ---------------------------------------------------------------------------
 166 #
 167 # When performing cross compilation for other architectures ARCH shall be set
 168 # to the target architecture. (See arch/* for the possibilities).
 169 # ARCH can be set during invocation of make:
 170 # make ARCH=ia64
 171 # Another way is to have ARCH set in the environment.
 172 # The default ARCH is the host where make is executed.
 173
 174 # CROSS_COMPILE specify the prefix used for all executables used
 175 # during compilation. Only gcc and related bin-utils executables
 176 # are prefixed with $(CROSS_COMPILE).
 177 # CROSS_COMPILE can be set on the command line
 178 # make CROSS_COMPILE=ia64-linux-
 179 # Alternatively CROSS_COMPILE can be set in the environment.
 180 # Default value for CROSS_COMPILE is not to prefix executables
 181 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 182 export KBUILD_BUILDHOST := $(SUBARCH)
 183 ARCH            ?= $(SUBARCH)
 184 CROSS_COMPILE   ?=
 185
 186 # Architecture as present in compile.h
 187 UTS_MACHINE     := $(ARCH)
 188 SRCARCH         := $(ARCH)
 189
 190 # Additional ARCH settings for x86
 191 ifeq ($(ARCH),i386)
 192         SRCARCH := x86
 193 endif
 194 ifeq ($(ARCH),x86_64)
 195         SRCARCH := x86
 196 endif
 197
 198 # Additional ARCH settings for sparc
 199 ifeq ($(ARCH),sparc64)
 200        SRCARCH := sparc
 201 endif
 202
 203 # Additional ARCH settings for sh
 204 ifeq ($(ARCH),sh64)
 205        SRCARCH := sh
 206 endif
 207
 208 # Where to locate arch specific headers
 209 hdr-arch  := $(SRCARCH)
 210
 211 ifeq ($(ARCH),m68knommu)
 212        hdr-arch  := m68k
 213 endif
 214
 215 KCONFIG_CONFIG  ?= .config
 216
 217 # SHELL used by kbuild
 218 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 219           else if [ -x /bin/bash ]; then echo /bin/bash; \
 220           else echo sh; fi ; fi)
 221
 222 HOSTCC       = gcc
 223 HOSTCXX      = g++
 224 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 225 HOSTCXXFLAGS = -O2
 226
 227 # Decide whether to build built-in, modular, or both.
 228 # Normally, just do built-in.
 229
 230 KBUILD_MODULES :=
 231 KBUILD_BUILTIN := 1
 232
 233 #       If we have only "make modules", don't compile built-in objects.
 234 #       When we're building modules with modversions, we need to consider
 235 #       the built-in objects during the descend as well, in order to
 236 #       make sure the checksums are up to date before we record them.
 237
 238 ifeq ($(MAKECMDGOALS),modules)
 239   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 240 endif
 241
 242 #       If we have "make <whatever> modules", compile modules
 243 #       in addition to whatever we do anyway.
 244 #       Just "make" or "make all" shall build modules as well
 245
 246 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 247   KBUILD_MODULES := 1
 248 endif
 249
 250 ifeq ($(MAKECMDGOALS),)
 251   KBUILD_MODULES := 1
 252 endif
 253
 254 export KBUILD_MODULES KBUILD_BUILTIN
 255 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 256
 257 # Beautify output
 258 # ---------------------------------------------------------------------------
 259 #
 260 # Normally, we echo the whole command before executing it. By making
 261 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 262 # $(quiet) to choose other forms of output instead, e.g.
 263 #
 264 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 265 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 266 #
 267 # If $(quiet) is empty, the whole command will be printed.
 268 # If it is set to "quiet_", only the short version will be printed.
 269 # If it is set to "silent_", nothing will be printed at all, since
 270 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 271 #
 272 # A simple variant is to prefix commands with $(Q) - that's useful
 273 # for commands that shall be hidden in non-verbose mode.
 274 #
 275 #       $(Q)ln $@ :<
 276 #
 277 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 278 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 279
 280 ifeq ($(KBUILD_VERBOSE),1)
 281   quiet =
 282   Q =
 283 else
 284   quiet=quiet_
 285   Q = @
 286 endif
 287
 288 # If the user is running make -s (silent mode), suppress echoing of
 289 # commands
 290
 291 ifneq ($(findstring s,$(MAKEFLAGS)),)
 292   quiet=silent_
 293 endif
 294
 295 export quiet Q KBUILD_VERBOSE
 296
 297
 298 # Look for make include files relative to root of kernel src
 299 MAKEFLAGS += --include-dir=$(srctree)
 300
 301 # We need some generic definitions (do not try to remake the file).
 302 $(srctree)/scripts/Kbuild.include: ;
 303 include $(srctree)/scripts/Kbuild.include
 304
 305 # Make variables (CC, etc...)
 306
 307 AS              = $(CROSS_COMPILE)as
 308 LD              = $(CROSS_COMPILE)ld
 309 CC              = $(CROSS_COMPILE)gcc
 310 CPP             = $(CC) -E
 311 AR              = $(CROSS_COMPILE)ar
 312 NM              = $(CROSS_COMPILE)nm
 313 STRIP           = $(CROSS_COMPILE)strip
 314 OBJCOPY         = $(CROSS_COMPILE)objcopy
 315 OBJDUMP         = $(CROSS_COMPILE)objdump
 316 AWK             = awk
 317 GENKSYMS        = scripts/genksyms/genksyms
 318 INSTALLKERNEL  := installkernel
 319 DEPMOD          = /sbin/depmod
 320 KALLSYMS        = scripts/kallsyms
 321 PERL            = perl
 322 CHECK           = sparse
 323
 324 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 325                   -Wbitwise -Wno-return-void $(CF)
 326 MODFLAGS        = -DMODULE
 327 CFLAGS_MODULE   = $(MODFLAGS)
 328 AFLAGS_MODULE   = $(MODFLAGS)
 329 LDFLAGS_MODULE  = -T $(srctree)/scripts/module-common.lds
 330 CFLAGS_KERNEL   =
 331 AFLAGS_KERNEL   =
 332 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 333
 334
 335 # Use LINUXINCLUDE when you must reference the include/ directory.
 336 # Needed to be compatible with the O= option
 337 LINUXINCLUDE    := -Iinclude \
 338                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 339                    -I$(srctree)/arch/$(hdr-arch)/include               \
 340                    -include include/linux/autoconf.h
 341
 342 KBUILD_CPPFLAGS := -D__KERNEL__
 343
 344 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 345                    -fno-strict-aliasing -fno-common \
 346                    -Werror-implicit-function-declaration \
 347                    -Wno-format-security \
 348                    -fno-delete-null-pointer-checks
 349 KBUILD_AFLAGS   := -D__ASSEMBLY__
 350
 351 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 352 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 353 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 354
 355 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 356 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 357 export CPP AR NM STRIP OBJCOPY OBJDUMP
 358 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 359 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 360
 361 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 362 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 363 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 364
 365 # When compiling out-of-tree modules, put MODVERDIR in the module
 366 # tree rather than in the kernel tree. The kernel tree might
 367 # even be read-only.
 368 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 369
 370 # Files to ignore in find ... statements
 371
 372 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
 373 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 374
 375 # ===========================================================================
 376 # Rules shared between *config targets and build targets
 377
 378 # Basic helpers built in scripts/
 379 PHONY += scripts_basic
 380 scripts_basic:
 381         $(Q)$(MAKE) $(build)=scripts/basic
 382
 383 # To avoid any implicit rule to kick in, define an empty command.
 384 scripts/basic/%: scripts_basic ;
 385
 386 PHONY += outputmakefile
 387 # outputmakefile generates a Makefile in the output directory, if using a
 388 # separate output directory. This allows convenient use of make in the
 389 # output directory.
 390 outputmakefile:
 391 ifneq ($(KBUILD_SRC),)
 392         $(Q)ln -fsn $(srctree) source
 393         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 394             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 395 endif
 396
 397 # To make sure we do not include .config for any of the *config targets
 398 # catch them early, and hand them over to scripts/kconfig/Makefile
 399 # It is allowed to specify more targets when calling make, including
 400 # mixing *config targets and build targets.
 401 # For example 'make oldconfig all'.
 402 # Detect when mixed targets is specified, and make a second invocation
 403 # of make so .config is not included in this case either (for *config).
 404
 405 no-dot-config-targets := clean mrproper distclean \
 406                          cscope TAGS tags help %docs check% \
 407                          include/linux/version.h headers_% \
 408                          kernelrelease kernelversion
 409
 410 config-targets := 0
 411 mixed-targets  := 0
 412 dot-config     := 1
 413
 414 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 415         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 416                 dot-config := 0
 417         endif
 418 endif
 419
 420 ifeq ($(KBUILD_EXTMOD),)
 421         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 422                 config-targets := 1
 423                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 424                         mixed-targets := 1
 425                 endif
 426         endif
 427 endif
 428
 429 ifeq ($(mixed-targets),1)
 430 # ===========================================================================
 431 # We're called with mixed targets (*config and build targets).
 432 # Handle them one by one.
 433
 434 %:: FORCE
 435         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 436
 437 else
 438 ifeq ($(config-targets),1)
 439 # ===========================================================================
 440 # *config targets only - make sure prerequisites are updated, and descend
 441 # in scripts/kconfig to make the *config target
 442
 443 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 444 # KBUILD_DEFCONFIG may point out an alternative default configuration
 445 # used for 'make defconfig'
 446 include $(srctree)/arch/$(SRCARCH)/Makefile
 447 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 448
 449 config: scripts_basic outputmakefile FORCE
 450         $(Q)mkdir -p include/linux include/config
 451         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 452
 453 %config: scripts_basic outputmakefile FORCE
 454         $(Q)mkdir -p include/linux include/config
 455         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 456
 457 else
 458 # ===========================================================================
 459 # Build targets only - this includes vmlinux, arch specific targets, clean
 460 # targets and others. In general all targets except *config targets.
 461
 462 ifeq ($(KBUILD_EXTMOD),)
 463 # Additional helpers built in scripts/
 464 # Carefully list dependencies so we do not try to build scripts twice
 465 # in parallel
 466 PHONY += scripts
 467 scripts: scripts_basic include/config/auto.conf
 468         $(Q)$(MAKE) $(build)=$(@)
 469
 470 # Objects we will link into vmlinux / subdirs we need to visit
 471 init-y          := init/
 472 drivers-y       := drivers/ sound/ firmware/
 473 net-y           := net/
 474 libs-y          := lib/
 475 core-y          := usr/
 476 endif # KBUILD_EXTMOD
 477
 478 ifeq ($(dot-config),1)
 479 # Read in config
 480 -include include/config/auto.conf
 481
 482 ifeq ($(KBUILD_EXTMOD),)
 483 # Read in dependencies to all Kconfig* files, make sure to run
 484 # oldconfig if changes are detected.
 485 -include include/config/auto.conf.cmd
 486
 487 # To avoid any implicit rule to kick in, define an empty command
 488 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 489
 490 # If .config is newer than include/config/auto.conf, someone tinkered
 491 # with it and forgot to run make oldconfig.
 492 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 493 # we execute the config step to be sure to catch updated Kconfig files
 494 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 495         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 496 else
 497 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 498 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 499 PHONY += include/config/auto.conf
 500
 501 include/config/auto.conf:
 502         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 503         echo;                                                           \
 504         echo "  ERROR: Kernel configuration is invalid.";               \
 505         echo "         include/linux/autoconf.h or $@ are missing.";    \
 506         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 507         echo;                                                           \
 508         /bin/false)
 509
 510 endif # KBUILD_EXTMOD
 511
 512 else
 513 # Dummy target needed, because used as prerequisite
 514 include/config/auto.conf: ;
 515 endif # $(dot-config)
 516
 517 # The all: target is the default when no target is given on the
 518 # command line.
 519 # This allow a user to issue only 'make' to build a kernel including modules
 520 # Defaults vmlinux but it is usually overridden in the arch makefile
 521 all: vmlinux
 522
 523 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 524 KBUILD_CFLAGS   += -Os
 525 else
 526 KBUILD_CFLAGS   += -O2
 527 endif
 528
 529 include $(srctree)/arch/$(SRCARCH)/Makefile
 530
 531 ifneq ($(CONFIG_FRAME_WARN),0)
 532 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 533 endif
 534
 535 # Force gcc to behave correct even for buggy distributions
 536 ifndef CONFIG_CC_STACKPROTECTOR
 537 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 538 endif
 539
 540 # This warning generated too much noise in a regular build.
 541 KBUILD_CFLAGS += $(call cc-option, -Wno-unused-but-set-variable)
 542
 543 ifdef CONFIG_FRAME_POINTER
 544 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 545 else
 546 KBUILD_CFLAGS   += -fomit-frame-pointer
 547 endif
 548
 549 ifdef CONFIG_DEBUG_INFO
 550 KBUILD_CFLAGS   += -g
 551 KBUILD_AFLAGS   += -gdwarf-2
 552 endif
 553
 554 ifdef CONFIG_FUNCTION_TRACER
 555 KBUILD_CFLAGS   += -pg
 556 endif
 557
 558 # We trigger additional mismatches with less inlining
 559 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 560 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 561 endif
 562
 563 # arch Makefile may override CC so keep this after arch Makefile is included
 564 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 565 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 566
 567 # warn about C99 declaration after statement
 568 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 569
 570 # disable pointer signed / unsigned warnings in gcc 4.0
 571 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 572
 573 # disable invalid "can't wrap" optimizations for signed / pointers
 574 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 575
 576 # revert to pre-gcc-4.4 behaviour of .eh_frame
 577 KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 578
 579 # conserve stack if available
 580 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 581
 582 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 583 # But warn user when we do so
 584 warn-assign = \
 585 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 586
 587 ifneq ($(KCPPFLAGS),)
 588         $(call warn-assign,CPPFLAGS)
 589         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 590 endif
 591 ifneq ($(KAFLAGS),)
 592         $(call warn-assign,AFLAGS)
 593         KBUILD_AFLAGS += $(KAFLAGS)
 594 endif
 595 ifneq ($(KCFLAGS),)
 596         $(call warn-assign,CFLAGS)
 597         KBUILD_CFLAGS += $(KCFLAGS)
 598 endif
 599
 600 # Use --build-id when available.
 601 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 602                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 603 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 604 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 605
 606 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 607 LDFLAGS_vmlinux += $(call ld-option, -X,)
 608 endif
 609
 610 # Default kernel image to build when no specific target is given.
 611 # KBUILD_IMAGE may be overruled on the command line or
 612 # set in the environment
 613 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 614 # this default value
 615 export KBUILD_IMAGE ?= vmlinux
 616
 617 #
 618 # INSTALL_PATH specifies where to place the updated kernel and system map
 619 # images. Default is /boot, but you can set it to other values
 620 export  INSTALL_PATH ?= /boot
 621
 622 #
 623 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 624 # relocations required by build roots.  This is not defined in the
 625 # makefile but the argument can be passed to make if needed.
 626 #
 627
 628 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 629 export MODLIB
 630
 631 #
 632 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 633 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 634 #  the default option --strip-debug will be used.  Otherwise,
 635 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 636
 637 ifdef INSTALL_MOD_STRIP
 638 ifeq ($(INSTALL_MOD_STRIP),1)
 639 mod_strip_cmd = $(STRIP) --strip-debug
 640 else
 641 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 642 endif # INSTALL_MOD_STRIP=1
 643 else
 644 mod_strip_cmd = true
 645 endif # INSTALL_MOD_STRIP
 646 export mod_strip_cmd
 647
 648
 649 ifeq ($(KBUILD_EXTMOD),)
 650 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 651
 652 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 653                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 654                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 655
 656 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 657                      $(init-n) $(init-) \
 658                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 659                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 660
 661 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 662 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 663 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 664 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 665 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 666 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 667 libs-y          := $(libs-y1) $(libs-y2)
 668
 669 # Build vmlinux
 670 # ---------------------------------------------------------------------------
 671 # vmlinux is built from the objects selected by $(vmlinux-init) and
 672 # $(vmlinux-main). Most are built-in.o files from top-level directories
 673 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 674 # Ordering when linking is important, and $(vmlinux-init) must be first.
 675 #
 676 # vmlinux
 677 #   ^
 678 #   |
 679 #   +-< $(vmlinux-init)
 680 #   |   +--< init/version.o + more
 681 #   |
 682 #   +--< $(vmlinux-main)
 683 #   |    +--< driver/built-in.o mm/built-in.o + more
 684 #   |
 685 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 686 #
 687 # vmlinux version (uname -v) cannot be updated during normal
 688 # descending-into-subdirs phase since we do not yet know if we need to
 689 # update vmlinux.
 690 # Therefore this step is delayed until just before final link of vmlinux -
 691 # except in the kallsyms case where it is done just before adding the
 692 # symbols to the kernel.
 693 #
 694 # System.map is generated to document addresses of all kernel symbols
 695
 696 vmlinux-init := $(head-y) $(init-y)
 697 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 698 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 699 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 700 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 701
 702 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 703 # May be overridden by arch/$(ARCH)/Makefile
 704 quiet_cmd_vmlinux__ ?= LD      $@
 705       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 706       -T $(vmlinux-lds) $(vmlinux-init)                          \
 707       --start-group $(vmlinux-main) --end-group                  \
 708       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 709
 710 # Generate new vmlinux version
 711 quiet_cmd_vmlinux_version = GEN     .version
 712       cmd_vmlinux_version = set -e;                     \
 713         if [ ! -r .version ]; then                      \
 714           rm -f .version;                               \
 715           echo 1 >.version;                             \
 716         else                                            \
 717           mv .version .old_version;                     \
 718           expr 0$$(cat .old_version) + 1 >.version;     \
 719         fi;                                             \
 720         $(MAKE) $(build)=init
 721
 722 # Generate System.map
 723 quiet_cmd_sysmap = SYSMAP
 724       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 725
 726 # Link of vmlinux
 727 # If CONFIG_KALLSYMS is set .version is already updated
 728 # Generate System.map and verify that the content is consistent
 729 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 730 # First command is ':' to allow us to use + in front of the rule
 731 define rule_vmlinux__
 732         :
 733         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 734
 735         $(call cmd,vmlinux__)
 736         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 737
 738         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 739           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 740         $(cmd_sysmap) $@ System.map;                                         \
 741         if [ $$? -ne 0 ]; then                                               \
 742                 rm -f $@;                                                    \
 743                 /bin/false;                                                  \
 744         fi;
 745         $(verify_kallsyms)
 746 endef
 747
 748
 749 ifdef CONFIG_KALLSYMS
 750 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 751 # It's a three stage process:
 752 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 753 #   empty
 754 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 755 #   the right size - vmlinux version (uname -v) is updated during this step
 756 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 757 #   but due to the added section, some addresses have shifted.
 758 #   From here, we generate a correct .tmp_kallsyms2.o
 759 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 760 # o Verify that the System.map from vmlinux matches the map from
 761 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 762 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 763 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 764 #   temporary bypass to allow the kernel to be built while the
 765 #   maintainers work out what went wrong with kallsyms.
 766
 767 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 768 last_kallsyms := 3
 769 else
 770 last_kallsyms := 2
 771 endif
 772
 773 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 774
 775 define verify_kallsyms
 776         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 777           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 778           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 779         $(Q)cmp -s System.map .tmp_System.map ||                             \
 780                 (echo Inconsistent kallsyms data;                            \
 781                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 782                  rm .tmp_kallsyms* ; /bin/false )
 783 endef
 784
 785 # Update vmlinux version before link
 786 # Use + in front of this rule to silent warning about make -j1
 787 # First command is ':' to allow us to use + in front of this rule
 788 cmd_ksym_ld = $(cmd_vmlinux__)
 789 define rule_ksym_ld
 790         :
 791         +$(call cmd,vmlinux_version)
 792         $(call cmd,vmlinux__)
 793         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 794 endef
 795
 796 # Generate .S file with all kernel symbols
 797 quiet_cmd_kallsyms = KSYM    $@
 798       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 799                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 800
 801 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 802         $(call if_changed_dep,as_o_S)
 803
 804 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 805         $(call cmd,kallsyms)
 806
 807 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 808 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 809         $(call if_changed_rule,ksym_ld)
 810
 811 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 812         $(call if_changed,vmlinux__)
 813
 814 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 815         $(call if_changed,vmlinux__)
 816
 817 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 818 $(KALLSYMS): scripts ;
 819
 820 # Generate some data for debugging strange kallsyms problems
 821 debug_kallsyms: .tmp_map$(last_kallsyms)
 822
 823 .tmp_map%: .tmp_vmlinux% FORCE
 824         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 825
 826 .tmp_map3: .tmp_map2
 827
 828 .tmp_map2: .tmp_map1
 829
 830 endif # ifdef CONFIG_KALLSYMS
 831
 832 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 833 # relevant sections renamed as per the linker script.
 834 quiet_cmd_vmlinux-modpost = LD      $@
 835       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 836          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 837          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 838 define rule_vmlinux-modpost
 839         :
 840         +$(call cmd,vmlinux-modpost)
 841         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 842         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 843 endef
 844
 845 # vmlinux image - including updated kernel symbols
 846 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 847 ifdef CONFIG_HEADERS_CHECK
 848         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 849 endif
 850 ifdef CONFIG_SAMPLES
 851         $(Q)$(MAKE) $(build)=samples
 852 endif
 853 ifdef CONFIG_BUILD_DOCSRC
 854         $(Q)$(MAKE) $(build)=Documentation
 855 endif
 856         $(call vmlinux-modpost)
 857         $(call if_changed_rule,vmlinux__)
 858         $(Q)rm -f .old_version
 859
 860 # build vmlinux.o first to catch section mismatch errors early
 861 ifdef CONFIG_KALLSYMS
 862 .tmp_vmlinux1: vmlinux.o
 863 endif
 864
 865 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 866 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 867         $(call if_changed_rule,vmlinux-modpost)
 868
 869 # The actual objects are generated when descending,
 870 # make sure no implicit rule kicks in
 871 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 872
 873 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 874 # Preset locale variables to speed up the build process. Limit locale
 875 # tweaks to this spot to avoid wrong language settings when running
 876 # make menuconfig etc.
 877 # Error messages still appears in the original language
 878
 879 PHONY += $(vmlinux-dirs)
 880 $(vmlinux-dirs): prepare scripts
 881         $(Q)$(MAKE) $(build)=$@
 882
 883 # Build the kernel release string
 884 #
 885 # The KERNELRELEASE value built here is stored in the file
 886 # include/config/kernel.release, and is used when executing several
 887 # make targets, such as "make install" or "make modules_install."
 888 #
 889 # The eventual kernel release string consists of the following fields,
 890 # shown in a hierarchical format to show how smaller parts are concatenated
 891 # to form the larger and final value, with values coming from places like
 892 # the Makefile, kernel config options, make command line options and/or
 893 # SCM tag information.
 894 #
 895 #       $(KERNELVERSION)
 896 #         $(VERSION)                    eg, 2
 897 #         $(PATCHLEVEL)                 eg, 6
 898 #         $(SUBLEVEL)                   eg, 18
 899 #         $(EXTRAVERSION)               eg, -rc6
 900 #       $(localver-full)
 901 #         $(localver)
 902 #           localversion*               (files without backups, containing '~')
 903 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 904 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 905 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 906 #           $(LOCALVERSION)             (from make command line if provided)
 907 #
 908 #  Note how the final $(localver-auto) string is included *only* if the
 909 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 910 # moment, only git is supported but other SCMs can edit the script
 911 # scripts/setlocalversion and add the appropriate checks as needed.
 912
 913 pattern = ".*/localversion[^~]*"
 914 string  = $(shell cat /dev/null \
 915            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 916
 917 localver = $(subst $(space),, $(string) \
 918                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 919
 920 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 921 # and if the SCM is know a tag from the SCM is appended.
 922 # The appended tag is determined by the SCM used.
 923 #
 924 # .scmversion is used when generating rpm packages so we do not loose
 925 # the version information from the SCM when we do the build of the kernel
 926 # from the copied source
 927 ifdef CONFIG_LOCALVERSION_AUTO
 928
 929 ifeq ($(wildcard .scmversion),)
 930         _localver-auto = $(shell $(CONFIG_SHELL) \
 931                          $(srctree)/scripts/setlocalversion $(srctree))
 932 else
 933         _localver-auto = $(shell cat .scmversion 2> /dev/null)
 934 endif
 935
 936         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 937 endif
 938
 939 localver-full = $(localver)$(localver-auto)
 940
 941 # Store (new) KERNELRELASE string in include/config/kernel.release
 942 kernelrelease = $(KERNELVERSION)$(localver-full)
 943 include/config/kernel.release: include/config/auto.conf FORCE
 944         $(Q)rm -f $@
 945         $(Q)echo $(kernelrelease) > $@
 946
 947
 948 # Things we need to do before we recursively start building the kernel
 949 # or the modules are listed in "prepare".
 950 # A multi level approach is used. prepareN is processed before prepareN-1.
 951 # archprepare is used in arch Makefiles and when processed asm symlink,
 952 # version.h and scripts_basic is processed / created.
 953
 954 # Listed in dependency order
 955 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 956
 957 # prepare3 is used to check if we are building in a separate output directory,
 958 # and if so do:
 959 # 1) Check that make has not been executed in the kernel src $(srctree)
 960 # 2) Create the include2 directory, used for the second asm symlink
 961 prepare3: include/config/kernel.release
 962 ifneq ($(KBUILD_SRC),)
 963         @$(kecho) '  Using $(srctree) as source for kernel'
 964         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 965                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 966                 echo "  in the '$(srctree)' directory.";\
 967                 /bin/false; \
 968         fi;
 969         $(Q)if [ ! -d include2 ]; then                                  \
 970             mkdir -p include2;                                          \
 971             ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 972         fi
 973 endif
 974
 975 # prepare2 creates a makefile if using a separate output directory
 976 prepare2: prepare3 outputmakefile
 977
 978 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 979                    include/asm include/config/auto.conf
 980         $(cmd_crmodverdir)
 981
 982 archprepare: prepare1 scripts_basic
 983
 984 prepare0: archprepare FORCE
 985         $(Q)$(MAKE) $(build)=.
 986         $(Q)$(MAKE) $(build)=. missing-syscalls
 987
 988 # All the preparing..
 989 prepare: prepare0
 990
 991 # The asm symlink changes when $(ARCH) changes.
 992 # Detect this and ask user to run make mrproper
 993 # If asm is a stale symlink (point to dir that does not exist) remove it
 994 define check-symlink
 995         set -e;                                                            \
 996         if [ -L include/asm ]; then                                        \
 997                 asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
 998                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
 999                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1000                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
1001                         exit 1;                                            \
1002                 fi;                                                        \
1003                 test -e $$asmlink || rm include/asm;                       \
1004         elif [ -d include/asm ]; then                                      \
1005                 echo "ERROR: $@ is a directory but a symlink was expected";\
1006                 exit 1;                                                    \
1007         fi
1008 endef
1009
1010 # We create the target directory of the symlink if it does
1011 # not exist so the test in check-symlink works and we have a
1012 # directory for generated filesas used by some architectures.
1013 define create-symlink
1014         if [ ! -L include/asm ]; then                                      \
1015                         $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1016                         if [ ! -d include/asm-$(SRCARCH) ]; then           \
1017                                 mkdir -p include/asm-$(SRCARCH);           \
1018                         fi;                                                \
1019                         ln -fsn asm-$(SRCARCH) $@;                         \
1020         fi
1021 endef
1022
1023 include/asm: FORCE
1024         $(Q)$(check-symlink)
1025         $(Q)$(create-symlink)
1026
1027 # Generate some files
1028 # ---------------------------------------------------------------------------
1029
1030 # KERNELRELEASE can change from a few different places, meaning version.h
1031 # needs to be updated, so this check is forced on all builds
1032
1033 uts_len := 64
1034 define filechk_utsrelease.h
1035         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1036           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1037           exit 1;                                                         \
1038         fi;                                                               \
1039         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1040 endef
1041
1042 define filechk_version.h
1043         (echo \#define LINUX_VERSION_CODE $(shell                             \
1044         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1045         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1046 endef
1047
1048 include/linux/version.h: $(srctree)/Makefile FORCE
1049         $(call filechk,version.h)
1050
1051 include/linux/utsrelease.h: include/config/kernel.release FORCE
1052         $(call filechk,utsrelease.h)
1053
1054 PHONY += headerdep
1055 headerdep:
1056         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1057
1058 # ---------------------------------------------------------------------------
1059
1060 PHONY += depend dep
1061 depend dep:
1062         @echo '*** Warning: make $@ is unnecessary now.'
1063
1064 # ---------------------------------------------------------------------------
1065 # Firmware install
1066 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1067 export INSTALL_FW_PATH
1068
1069 PHONY += firmware_install
1070 firmware_install: FORCE
1071         @mkdir -p $(objtree)/firmware
1072         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1073
1074 # ---------------------------------------------------------------------------
1075 # Kernel headers
1076
1077 #Default location for installed headers
1078 export INSTALL_HDR_PATH = $(objtree)/usr
1079
1080 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1081 # Find out where the Kbuild file is located to support
1082 # arch/$(ARCH)/include/asm
1083 hdr-dir = $(strip                                                         \
1084           $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1085                arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1086
1087 # If we do an all arch process set dst to asm-$(hdr-arch)
1088 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1089
1090 PHONY += __headers
1091 __headers: include/linux/version.h scripts_basic FORCE
1092         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1093
1094 PHONY += headers_install_all
1095 headers_install_all:
1096         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1097
1098 PHONY += headers_install
1099 headers_install: __headers
1100         $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1101         $(error Headers not exportable for the $(SRCARCH) architecture))
1102         $(Q)$(MAKE) $(hdr-inst)=include
1103         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1104
1105 PHONY += headers_check_all
1106 headers_check_all: headers_install_all
1107         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1108
1109 PHONY += headers_check
1110 headers_check: headers_install
1111         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1112         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1113
1114 # ---------------------------------------------------------------------------
1115 # Modules
1116
1117 ifdef CONFIG_MODULES
1118
1119 # By default, build modules as well
1120
1121 all: modules
1122
1123 #       Build modules
1124 #
1125 #       A module can be listed more than once in obj-m resulting in
1126 #       duplicate lines in modules.order files.  Those are removed
1127 #       using awk while concatenating to the final file.
1128
1129 PHONY += modules
1130 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1131         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1132         @$(kecho) '  Building modules, stage 2.';
1133         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1134         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1135
1136
1137 # Target to prepare building external modules
1138 PHONY += modules_prepare
1139 modules_prepare: prepare scripts
1140
1141 # Target to install modules
1142 PHONY += modules_install
1143 modules_install: _modinst_ _modinst_post
1144
1145 PHONY += _modinst_
1146 _modinst_:
1147         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1148                 echo "Warning: you may need to install module-init-tools"; \
1149                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1150                 sleep 1; \
1151         fi
1152         @rm -rf $(MODLIB)/kernel
1153         @rm -f $(MODLIB)/source
1154         @mkdir -p $(MODLIB)/kernel
1155         @ln -s $(srctree) $(MODLIB)/source
1156         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1157                 rm -f $(MODLIB)/build ; \
1158                 ln -s $(objtree) $(MODLIB)/build ; \
1159         fi
1160         @cp -f $(objtree)/modules.order $(MODLIB)/
1161         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1162
1163 # This depmod is only for convenience to give the initial
1164 # boot a modules.dep even before / is mounted read-write.  However the
1165 # boot script depmod is the master version.
1166 PHONY += _modinst_post
1167 _modinst_post: _modinst_
1168         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1169         $(call cmd,depmod)
1170
1171 else # CONFIG_MODULES
1172
1173 # Modules not configured
1174 # ---------------------------------------------------------------------------
1175
1176 modules modules_install: FORCE
1177         @echo
1178         @echo "The present kernel configuration has modules disabled."
1179         @echo "Type 'make config' and enable loadable module support."
1180         @echo "Then build a kernel with module support enabled."
1181         @echo
1182         @exit 1
1183
1184 endif # CONFIG_MODULES
1185
1186 ###
1187 # Cleaning is done on three levels.
1188 # make clean     Delete most generated files
1189 #                Leave enough to build external modules
1190 # make mrproper  Delete the current configuration, and all generated files
1191 # make distclean Remove editor backup files, patch leftover files and the like
1192
1193 # Directories & files removed with 'make clean'
1194 CLEAN_DIRS  += $(MODVERDIR)
1195 CLEAN_FILES +=  vmlinux System.map \
1196                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1197
1198 # Directories & files removed with 'make mrproper'
1199 MRPROPER_DIRS  += include/config include2 usr/include include/generated
1200 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1201                   include/linux/autoconf.h include/linux/version.h      \
1202                   include/linux/utsrelease.h                            \
1203                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1204                   Module.symvers Module.markers tags TAGS cscope*
1205
1206 # clean - Delete most, but leave enough to build external modules
1207 #
1208 clean: rm-dirs  := $(CLEAN_DIRS)
1209 clean: rm-files := $(CLEAN_FILES)
1210 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1211
1212 PHONY += $(clean-dirs) clean archclean
1213 $(clean-dirs):
1214         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1215
1216 clean: archclean $(clean-dirs)
1217         $(call cmd,rmdirs)
1218         $(call cmd,rmfiles)
1219         @find . $(RCS_FIND_IGNORE) \
1220                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1221                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1222                 -o -name '*.symtypes' -o -name 'modules.order' \
1223                 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \
1224                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1225
1226 # mrproper - Delete all generated files, including .config
1227 #
1228 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1229 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1230 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1231
1232 PHONY += $(mrproper-dirs) mrproper archmrproper
1233 $(mrproper-dirs):
1234         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1235
1236 mrproper: clean archmrproper $(mrproper-dirs)
1237         $(call cmd,rmdirs)
1238         $(call cmd,rmfiles)
1239
1240 # distclean
1241 #
1242 PHONY += distclean
1243
1244 distclean: mrproper
1245         @find $(srctree) $(RCS_FIND_IGNORE) \
1246                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1247                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1248                 -o -name '.*.rej' -o -size 0 \
1249                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1250                 -type f -print | xargs rm -f
1251
1252
1253 # Packaging of the kernel to various formats
1254 # ---------------------------------------------------------------------------
1255 # rpm target kept for backward compatibility
1256 package-dir     := $(srctree)/scripts/package
1257
1258 %pkg: include/config/kernel.release FORCE
1259         $(Q)$(MAKE) $(build)=$(package-dir) $@
1260 rpm: include/config/kernel.release FORCE
1261         $(Q)$(MAKE) $(build)=$(package-dir) $@
1262
1263
1264 # Brief documentation of the typical targets used
1265 # ---------------------------------------------------------------------------
1266
1267 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1268 boards := $(notdir $(boards))
1269 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1270 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1271
1272 help:
1273         @echo  'Cleaning targets:'
1274         @echo  '  clean           - Remove most generated files but keep the config and'
1275         @echo  '                    enough build support to build external modules'
1276         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1277         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1278         @echo  ''
1279         @echo  'Configuration targets:'
1280         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1281         @echo  ''
1282         @echo  'Other generic targets:'
1283         @echo  '  all             - Build all targets marked with [*]'
1284         @echo  '* vmlinux         - Build the bare kernel'
1285         @echo  '* modules         - Build all modules'
1286         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1287         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1288         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1289         @echo  '  dir/            - Build all files in dir and below'
1290         @echo  '  dir/file.[ois]  - Build specified target only'
1291         @echo  '  dir/file.ko     - Build module including final link'
1292         @echo  '  modules_prepare - Set up for building external modules'
1293         @echo  '  tags/TAGS       - Generate tags file for editors'
1294         @echo  '  cscope          - Generate cscope index'
1295         @echo  '  kernelrelease   - Output the release version string'
1296         @echo  '  kernelversion   - Output the version stored in Makefile'
1297         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1298          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1299          echo  ''
1300         @echo  'Static analysers'
1301         @echo  '  checkstack      - Generate a list of stack hogs'
1302         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1303         @echo  '  versioncheck    - Sanity check on version.h usage'
1304         @echo  '  includecheck    - Check for duplicate included header files'
1305         @echo  '  export_report   - List the usages of all exported symbols'
1306         @echo  '  headers_check   - Sanity check on exported headers'
1307         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1308          echo  ''
1309         @echo  'Kernel packaging:'
1310         @$(MAKE) $(build)=$(package-dir) help
1311         @echo  ''
1312         @echo  'Documentation targets:'
1313         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1314         @echo  ''
1315         @echo  'Architecture specific targets ($(SRCARCH)):'
1316         @$(if $(archhelp),$(archhelp),\
1317                 echo '  No architecture specific help defined for $(SRCARCH)')
1318         @echo  ''
1319         @$(if $(boards), \
1320                 $(foreach b, $(boards), \
1321                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1322                 echo '')
1323         @$(if $(board-dirs), \
1324                 $(foreach b, $(board-dirs), \
1325                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1326                 printf "  %-16s - Show all of the above\\n" help-boards; \
1327                 echo '')
1328
1329         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1330         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1331         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1332         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1333         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1334         @echo  ''
1335         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1336         @echo  'For further info see the ./README file'
1337
1338
1339 help-board-dirs := $(addprefix help-,$(board-dirs))
1340
1341 help-boards: $(help-board-dirs)
1342
1343 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1344
1345 $(help-board-dirs): help-%:
1346         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1347         @$(if $(boards-per-dir), \
1348                 $(foreach b, $(boards-per-dir), \
1349                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1350                 echo '')
1351
1352
1353 # Documentation targets
1354 # ---------------------------------------------------------------------------
1355 %docs: scripts_basic FORCE
1356         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1357
1358 else # KBUILD_EXTMOD
1359
1360 ###
1361 # External module support.
1362 # When building external modules the kernel used as basis is considered
1363 # read-only, and no consistency checks are made and the make
1364 # system is not used on the basis kernel. If updates are required
1365 # in the basis kernel ordinary make commands (without M=...) must
1366 # be used.
1367 #
1368 # The following are the only valid targets when building external
1369 # modules.
1370 # make M=dir clean     Delete all automatically generated files
1371 # make M=dir modules   Make all modules in specified dir
1372 # make M=dir           Same as 'make M=dir modules'
1373 # make M=dir modules_install
1374 #                      Install the modules built in the module directory
1375 #                      Assumes install directory is already created
1376
1377 # We are always building modules
1378 KBUILD_MODULES := 1
1379 PHONY += crmodverdir
1380 crmodverdir:
1381         $(cmd_crmodverdir)
1382
1383 PHONY += $(objtree)/Module.symvers
1384 $(objtree)/Module.symvers:
1385         @test -e $(objtree)/Module.symvers || ( \
1386         echo; \
1387         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1388         echo "           is missing; modules will have no dependencies and modversions."; \
1389         echo )
1390
1391 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1392 PHONY += $(module-dirs) modules
1393 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1394         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1395
1396 modules: $(module-dirs)
1397         @$(kecho) '  Building modules, stage 2.';
1398         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1399
1400 PHONY += modules_install
1401 modules_install: _emodinst_ _emodinst_post
1402
1403 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1404 PHONY += _emodinst_
1405 _emodinst_:
1406         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1407         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1408
1409 PHONY += _emodinst_post
1410 _emodinst_post: _emodinst_
1411         $(call cmd,depmod)
1412
1413 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1414
1415 PHONY += $(clean-dirs) clean
1416 $(clean-dirs):
1417         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1418
1419 clean:  rm-dirs := $(MODVERDIR)
1420 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1421                    $(KBUILD_EXTMOD)/Module.markers \
1422                    $(KBUILD_EXTMOD)/modules.order
1423 clean: $(clean-dirs)
1424         $(call cmd,rmdirs)
1425         $(call cmd,rmfiles)
1426         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1427                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1428                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1429                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1430
1431 help:
1432         @echo  '  Building external modules.'
1433         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1434         @echo  ''
1435         @echo  '  modules         - default target, build the module(s)'
1436         @echo  '  modules_install - install the module'
1437         @echo  '  clean           - remove generated files in module directory only'
1438         @echo  ''
1439
1440 # Dummies...
1441 PHONY += prepare scripts
1442 prepare: ;
1443 scripts: ;
1444 endif # KBUILD_EXTMOD
1445
1446 # Generate tags for editors
1447 # ---------------------------------------------------------------------------
1448 quiet_cmd_tags = GEN     $@
1449       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1450
1451 tags TAGS cscope: FORCE
1452         $(call cmd,tags)
1453
1454 # Scripts to check various things for consistency
1455 # ---------------------------------------------------------------------------
1456
1457 includecheck:
1458         find * $(RCS_FIND_IGNORE) \
1459                 -name '*.[hcS]' -type f -print | sort \
1460                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1461
1462 versioncheck:
1463         find * $(RCS_FIND_IGNORE) \
1464                 -name '*.[hcS]' -type f -print | sort \
1465                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1466
1467 namespacecheck:
1468         $(PERL) $(srctree)/scripts/namespace.pl
1469
1470 export_report:
1471         $(PERL) $(srctree)/scripts/export_report.pl
1472
1473 endif #ifeq ($(config-targets),1)
1474 endif #ifeq ($(mixed-targets),1)
1475
1476 PHONY += checkstack kernelrelease kernelversion
1477
1478 # UML needs a little special treatment here.  It wants to use the host
1479 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1480 # else wants $(ARCH), including people doing cross-builds, which means
1481 # that $(SUBARCH) doesn't work here.
1482 ifeq ($(ARCH), um)
1483 CHECKSTACK_ARCH := $(SUBARCH)
1484 else
1485 CHECKSTACK_ARCH := $(ARCH)
1486 endif
1487 checkstack:
1488         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1489         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1490
1491 kernelrelease:
1492         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1493         $(error kernelrelease not valid - run 'make prepare' to update it))
1494 kernelversion:
1495         @echo $(KERNELVERSION)
1496
1497 # Single targets
1498 # ---------------------------------------------------------------------------
1499 # Single targets are compatible with:
1500 # - build with mixed source and output
1501 # - build with separate output dir 'make O=...'
1502 # - external modules
1503 #
1504 #  target-dir => where to store outputfile
1505 #  build-dir  => directory in kernel source tree to use
1506
1507 ifeq ($(KBUILD_EXTMOD),)
1508         build-dir  = $(patsubst %/,%,$(dir $@))
1509         target-dir = $(dir $@)
1510 else
1511         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1512         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1513         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1514 endif
1515
1516 %.s: %.c prepare scripts FORCE
1517         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1518 %.i: %.c prepare scripts FORCE
1519         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1520 %.o: %.c prepare scripts FORCE
1521         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1522 %.lst: %.c prepare scripts FORCE
1523         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524 %.s: %.S prepare scripts FORCE
1525         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526 %.o: %.S prepare scripts FORCE
1527         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528 %.symtypes: %.c prepare scripts FORCE
1529         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530
1531 # Modules
1532 /: prepare scripts FORCE
1533         $(cmd_crmodverdir)
1534         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1535         $(build)=$(build-dir)
1536 %/: prepare scripts FORCE
1537         $(cmd_crmodverdir)
1538         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1539         $(build)=$(build-dir)
1540 %.ko: prepare scripts FORCE
1541         $(cmd_crmodverdir)
1542         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1543         $(build)=$(build-dir) $(@:.ko=.o)
1544         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1545
1546 # FIXME Should go into a make.lib or something
1547 # ===========================================================================
1548
1549 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1550       cmd_rmdirs = rm -rf $(rm-dirs)
1551
1552 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1553       cmd_rmfiles = rm -f $(rm-files)
1554
1555 # Run depmod only if we have System.map and depmod is executable
1556 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1557       cmd_depmod = \
1558         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1559                 $(DEPMOD) -ae -F System.map                                     \
1560                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1561                 $(KERNELRELEASE);                                               \
1562         fi
1563
1564 # Create temporary dir for module support files
1565 # clean it up only when building all modules
1566 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1567                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1568
1569 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1570           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1571           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1572
1573 quiet_cmd_as_o_S = AS      $@
1574 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1575
1576 # read all saved command lines
1577
1578 targets := $(wildcard $(sort $(targets)))
1579 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1580
1581 ifneq ($(cmd_files),)
1582   $(cmd_files): ;       # Do not try to update included dependency files
1583   include $(cmd_files)
1584 endif
1585
1586 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1587 # Usage:
1588 # $(Q)$(MAKE) $(clean)=dir
1589 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1590
1591 endif   # skip-makefile
1592
1593 PHONY += FORCE
1594 FORCE:
1595
1596 # Declare the contents of the .PHONY variable as phony.  We keep that
1597 # information in a variable so we can use it in if_changed and friends.
1598 .PHONY: $(PHONY)