Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 31
   4 EXTRAVERSION = -rc5
   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 SUBARCH := $(shell echo "i386")
 164
 165 # Cross compiling and selecting different set of gcc/bin-utils
 166 # ---------------------------------------------------------------------------
 167 #
 168 # When performing cross compilation for other architectures ARCH shall be set
 169 # to the target architecture. (See arch/* for the possibilities).
 170 # ARCH can be set during invocation of make:
 171 # make ARCH=ia64
 172 # Another way is to have ARCH set in the environment.
 173 # The default ARCH is the host where make is executed.
 174
 175 # CROSS_COMPILE specify the prefix used for all executables used
 176 # during compilation. Only gcc and related bin-utils executables
 177 # are prefixed with $(CROSS_COMPILE).
 178 # CROSS_COMPILE can be set on the command line
 179 # make CROSS_COMPILE=ia64-linux-
 180 # Alternatively CROSS_COMPILE can be set in the environment.
 181 # Default value for CROSS_COMPILE is not to prefix executables
 182 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 183 export KBUILD_BUILDHOST := $(SUBARCH)
 184 ARCH            ?= $(SUBARCH)
 185 CROSS_COMPILE   ?=
 186
 187 # Architecture as present in compile.h
 188 UTS_MACHINE     := $(ARCH)
 189 SRCARCH         := $(ARCH)
 190
 191 # Additional ARCH settings for x86
 192 ifeq ($(ARCH),i386)
 193         SRCARCH := x86
 194 endif
 195 ifeq ($(ARCH),x86_64)
 196         SRCARCH := x86
 197 endif
 198
 199 # Additional ARCH settings for sparc
 200 ifeq ($(ARCH),sparc64)
 201        SRCARCH := sparc
 202 endif
 203
 204 # Additional ARCH settings for sh
 205 ifeq ($(ARCH),sh64)
 206        SRCARCH := sh
 207 endif
 208
 209 # Where to locate arch specific headers
 210 hdr-arch  := $(SRCARCH)
 211
 212 ifeq ($(ARCH),m68knommu)
 213        hdr-arch  := m68k
 214 endif
 215
 216 KCONFIG_CONFIG  ?= .config
 217
 218 # SHELL used by kbuild
 219 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 220           else if [ -x /bin/bash ]; then echo /bin/bash; \
 221           else echo sh; fi ; fi)
 222
 223 HOSTCC       = gcc
 224 HOSTCXX      = g++
 225 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 226 HOSTCXXFLAGS = -O2
 227
 228 # Decide whether to build built-in, modular, or both.
 229 # Normally, just do built-in.
 230
 231 KBUILD_MODULES :=
 232 KBUILD_BUILTIN := 1
 233
 234 #       If we have only "make modules", don't compile built-in objects.
 235 #       When we're building modules with modversions, we need to consider
 236 #       the built-in objects during the descend as well, in order to
 237 #       make sure the checksums are up to date before we record them.
 238
 239 ifeq ($(MAKECMDGOALS),modules)
 240   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 241 endif
 242
 243 #       If we have "make <whatever> modules", compile modules
 244 #       in addition to whatever we do anyway.
 245 #       Just "make" or "make all" shall build modules as well
 246
 247 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 248   KBUILD_MODULES := 1
 249 endif
 250
 251 ifeq ($(MAKECMDGOALS),)
 252   KBUILD_MODULES := 1
 253 endif
 254
 255 export KBUILD_MODULES KBUILD_BUILTIN
 256 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 257
 258 # Beautify output
 259 # ---------------------------------------------------------------------------
 260 #
 261 # Normally, we echo the whole command before executing it. By making
 262 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 263 # $(quiet) to choose other forms of output instead, e.g.
 264 #
 265 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 266 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 267 #
 268 # If $(quiet) is empty, the whole command will be printed.
 269 # If it is set to "quiet_", only the short version will be printed.
 270 # If it is set to "silent_", nothing will be printed at all, since
 271 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 272 #
 273 # A simple variant is to prefix commands with $(Q) - that's useful
 274 # for commands that shall be hidden in non-verbose mode.
 275 #
 276 #       $(Q)ln $@ :<
 277 #
 278 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 279 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 280
 281 ifeq ($(KBUILD_VERBOSE),1)
 282   quiet =
 283   Q =
 284 else
 285   quiet=quiet_
 286   Q = @
 287 endif
 288
 289 # If the user is running make -s (silent mode), suppress echoing of
 290 # commands
 291
 292 ifneq ($(findstring s,$(MAKEFLAGS)),)
 293   quiet=silent_
 294 endif
 295
 296 export quiet Q KBUILD_VERBOSE
 297
 298
 299 # Look for make include files relative to root of kernel src
 300 MAKEFLAGS += --include-dir=$(srctree)
 301
 302 # We need some generic definitions (do not try to remake the file).
 303 $(srctree)/scripts/Kbuild.include: ;
 304 include $(srctree)/scripts/Kbuild.include
 305
 306 # Make variables (CC, etc...)
 307
 308 AS              = $(CROSS_COMPILE)as
 309 LD              = $(CROSS_COMPILE)ld
 310 CC              = $(CROSS_COMPILE)gcc
 311 CPP             = $(CC) -E
 312 AR              = $(CROSS_COMPILE)ar
 313 NM              = $(CROSS_COMPILE)nm
 314 STRIP           = $(CROSS_COMPILE)strip
 315 OBJCOPY         = $(CROSS_COMPILE)objcopy
 316 OBJDUMP         = $(CROSS_COMPILE)objdump
 317 AWK             = awk
 318 GENKSYMS        = scripts/genksyms/genksyms
 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  =
 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 MAKE AWK GENKSYMS PERL UTS_MACHINE
 358 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 359
 360 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 361 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 362 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 363
 364 # When compiling out-of-tree modules, put MODVERDIR in the module
 365 # tree rather than in the kernel tree. The kernel tree might
 366 # even be read-only.
 367 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 368
 369 # Files to ignore in find ... statements
 370
 371 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
 372 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 373
 374 # ===========================================================================
 375 # Rules shared between *config targets and build targets
 376
 377 # Basic helpers built in scripts/
 378 PHONY += scripts_basic
 379 scripts_basic:
 380         $(Q)$(MAKE) $(build)=scripts/basic
 381
 382 # To avoid any implicit rule to kick in, define an empty command.
 383 scripts/basic/%: scripts_basic ;
 384
 385 PHONY += outputmakefile
 386 # outputmakefile generates a Makefile in the output directory, if using a
 387 # separate output directory. This allows convenient use of make in the
 388 # output directory.
 389 outputmakefile:
 390 ifneq ($(KBUILD_SRC),)
 391         $(Q)ln -fsn $(srctree) source
 392         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 393             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 394 endif
 395
 396 # To make sure we do not include .config for any of the *config targets
 397 # catch them early, and hand them over to scripts/kconfig/Makefile
 398 # It is allowed to specify more targets when calling make, including
 399 # mixing *config targets and build targets.
 400 # For example 'make oldconfig all'.
 401 # Detect when mixed targets is specified, and make a second invocation
 402 # of make so .config is not included in this case either (for *config).
 403
 404 no-dot-config-targets := clean mrproper distclean \
 405                          cscope TAGS tags help %docs check% \
 406                          include/linux/version.h headers_% \
 407                          kernelrelease kernelversion
 408
 409 config-targets := 0
 410 mixed-targets  := 0
 411 dot-config     := 1
 412
 413 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 414         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 415                 dot-config := 0
 416         endif
 417 endif
 418
 419 ifeq ($(KBUILD_EXTMOD),)
 420         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 421                 config-targets := 1
 422                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 423                         mixed-targets := 1
 424                 endif
 425         endif
 426 endif
 427
 428 ifeq ($(mixed-targets),1)
 429 # ===========================================================================
 430 # We're called with mixed targets (*config and build targets).
 431 # Handle them one by one.
 432
 433 %:: FORCE
 434         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 435
 436 else
 437 ifeq ($(config-targets),1)
 438 # ===========================================================================
 439 # *config targets only - make sure prerequisites are updated, and descend
 440 # in scripts/kconfig to make the *config target
 441
 442 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 443 # KBUILD_DEFCONFIG may point out an alternative default configuration
 444 # used for 'make defconfig'
 445 include $(srctree)/arch/$(SRCARCH)/Makefile
 446 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 447
 448 config: scripts_basic outputmakefile FORCE
 449         $(Q)mkdir -p include/linux include/config
 450         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 451
 452 %config: scripts_basic outputmakefile FORCE
 453         $(Q)mkdir -p include/linux include/config
 454         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 455
 456 else
 457 # ===========================================================================
 458 # Build targets only - this includes vmlinux, arch specific targets, clean
 459 # targets and others. In general all targets except *config targets.
 460
 461 ifeq ($(KBUILD_EXTMOD),)
 462 # Additional helpers built in scripts/
 463 # Carefully list dependencies so we do not try to build scripts twice
 464 # in parallel
 465 PHONY += scripts
 466 scripts: scripts_basic include/config/auto.conf
 467         $(Q)$(MAKE) $(build)=$(@)
 468
 469 # Objects we will link into vmlinux / subdirs we need to visit
 470 init-y          := init/
 471 drivers-y       := drivers/ sound/ firmware/
 472 net-y           := net/
 473 libs-y          := lib/
 474 core-y          := usr/
 475 endif # KBUILD_EXTMOD
 476
 477 ifeq ($(dot-config),1)
 478 # Read in config
 479 -include include/config/auto.conf
 480
 481 ifeq ($(KBUILD_EXTMOD),)
 482 # Read in dependencies to all Kconfig* files, make sure to run
 483 # oldconfig if changes are detected.
 484 -include include/config/auto.conf.cmd
 485
 486 # To avoid any implicit rule to kick in, define an empty command
 487 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 488
 489 # If .config is newer than include/config/auto.conf, someone tinkered
 490 # with it and forgot to run make oldconfig.
 491 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 492 # we execute the config step to be sure to catch updated Kconfig files
 493 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 494         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 495 else
 496 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 497 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 498 PHONY += include/config/auto.conf
 499
 500 include/config/auto.conf:
 501         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 502         echo;                                                           \
 503         echo "  ERROR: Kernel configuration is invalid.";               \
 504         echo "         include/linux/autoconf.h or $@ are missing.";    \
 505         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 506         echo;                                                           \
 507         /bin/false)
 508
 509 endif # KBUILD_EXTMOD
 510
 511 else
 512 # Dummy target needed, because used as prerequisite
 513 include/config/auto.conf: ;
 514 endif # $(dot-config)
 515
 516 # The all: target is the default when no target is given on the
 517 # command line.
 518 # This allow a user to issue only 'make' to build a kernel including modules
 519 # Defaults vmlinux but it is usually overridden in the arch makefile
 520 all: vmlinux
 521
 522 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 523 KBUILD_CFLAGS   += -Os
 524 else
 525 KBUILD_CFLAGS   += -O2
 526 endif
 527
 528 include $(srctree)/arch/$(SRCARCH)/Makefile
 529
 530 ifneq ($(CONFIG_FRAME_WARN),0)
 531 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 532 endif
 533
 534 # Force gcc to behave correct even for buggy distributions
 535 ifndef CONFIG_CC_STACKPROTECTOR
 536 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 537 endif
 538
 539 ifdef CONFIG_FRAME_POINTER
 540 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 541 else
 542 KBUILD_CFLAGS   += -fomit-frame-pointer
 543 endif
 544
 545 ifdef CONFIG_DEBUG_INFO
 546 KBUILD_CFLAGS   += -g
 547 KBUILD_AFLAGS   += -gdwarf-2
 548 endif
 549
 550 ifdef CONFIG_FUNCTION_TRACER
 551 KBUILD_CFLAGS   += -pg
 552 endif
 553
 554 # We trigger additional mismatches with less inlining
 555 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 556 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 557 endif
 558
 559 # arch Makefile may override CC so keep this after arch Makefile is included
 560 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 561 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 562
 563 # warn about C99 declaration after statement
 564 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 565
 566 # disable pointer signed / unsigned warnings in gcc 4.0
 567 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 568
 569 # disable invalid "can't wrap" optimizations for signed / pointers
 570 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 571
 572 # revert to pre-gcc-4.4 behaviour of .eh_frame
 573 KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 574
 575 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 576 # But warn user when we do so
 577 warn-assign = \
 578 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 579
 580 ifneq ($(KCPPFLAGS),)
 581         $(call warn-assign,CPPFLAGS)
 582         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 583 endif
 584 ifneq ($(KAFLAGS),)
 585         $(call warn-assign,AFLAGS)
 586         KBUILD_AFLAGS += $(KAFLAGS)
 587 endif
 588 ifneq ($(KCFLAGS),)
 589         $(call warn-assign,CFLAGS)
 590         KBUILD_CFLAGS += $(KCFLAGS)
 591 endif
 592
 593 # Use --build-id when available.
 594 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 595                               $(call ld-option, -Wl$(comma)--build-id,))
 596 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 597 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 598
 599 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 600 LDFLAGS_vmlinux += -X
 601 endif
 602
 603 # Default kernel image to build when no specific target is given.
 604 # KBUILD_IMAGE may be overruled on the command line or
 605 # set in the environment
 606 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 607 # this default value
 608 export KBUILD_IMAGE ?= vmlinux
 609
 610 #
 611 # INSTALL_PATH specifies where to place the updated kernel and system map
 612 # images. Default is /boot, but you can set it to other values
 613 export  INSTALL_PATH ?= /boot
 614
 615 #
 616 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 617 # relocations required by build roots.  This is not defined in the
 618 # makefile but the argument can be passed to make if needed.
 619 #
 620
 621 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 622 export MODLIB
 623
 624 #
 625 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 626 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 627 #  the default option --strip-debug will be used.  Otherwise,
 628 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 629
 630 ifdef INSTALL_MOD_STRIP
 631 ifeq ($(INSTALL_MOD_STRIP),1)
 632 mod_strip_cmd = $(STRIP) --strip-debug
 633 else
 634 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 635 endif # INSTALL_MOD_STRIP=1
 636 else
 637 mod_strip_cmd = true
 638 endif # INSTALL_MOD_STRIP
 639 export mod_strip_cmd
 640
 641
 642 ifeq ($(KBUILD_EXTMOD),)
 643 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 644
 645 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 646                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 647                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 648
 649 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 650                      $(init-n) $(init-) \
 651                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 652                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 653
 654 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 655 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 656 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 657 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 658 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 659 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 660 libs-y          := $(libs-y1) $(libs-y2)
 661
 662 # Build vmlinux
 663 # ---------------------------------------------------------------------------
 664 # vmlinux is built from the objects selected by $(vmlinux-init) and
 665 # $(vmlinux-main). Most are built-in.o files from top-level directories
 666 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 667 # Ordering when linking is important, and $(vmlinux-init) must be first.
 668 #
 669 # vmlinux
 670 #   ^
 671 #   |
 672 #   +-< $(vmlinux-init)
 673 #   |   +--< init/version.o + more
 674 #   |
 675 #   +--< $(vmlinux-main)
 676 #   |    +--< driver/built-in.o mm/built-in.o + more
 677 #   |
 678 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 679 #
 680 # vmlinux version (uname -v) cannot be updated during normal
 681 # descending-into-subdirs phase since we do not yet know if we need to
 682 # update vmlinux.
 683 # Therefore this step is delayed until just before final link of vmlinux -
 684 # except in the kallsyms case where it is done just before adding the
 685 # symbols to the kernel.
 686 #
 687 # System.map is generated to document addresses of all kernel symbols
 688
 689 vmlinux-init := $(head-y) $(init-y)
 690 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 691 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 692 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 693 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 694
 695 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 696 # May be overridden by arch/$(ARCH)/Makefile
 697 quiet_cmd_vmlinux__ ?= LD      $@
 698       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 699       -T $(vmlinux-lds) $(vmlinux-init)                          \
 700       --start-group $(vmlinux-main) --end-group                  \
 701       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 702
 703 # Generate new vmlinux version
 704 quiet_cmd_vmlinux_version = GEN     .version
 705       cmd_vmlinux_version = set -e;                     \
 706         if [ ! -r .version ]; then                      \
 707           rm -f .version;                               \
 708           echo 1 >.version;                             \
 709         else                                            \
 710           mv .version .old_version;                     \
 711           expr 0$$(cat .old_version) + 1 >.version;     \
 712         fi;                                             \
 713         $(MAKE) $(build)=init
 714
 715 # Generate System.map
 716 quiet_cmd_sysmap = SYSMAP
 717       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 718
 719 # Link of vmlinux
 720 # If CONFIG_KALLSYMS is set .version is already updated
 721 # Generate System.map and verify that the content is consistent
 722 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 723 # First command is ':' to allow us to use + in front of the rule
 724 define rule_vmlinux__
 725         :
 726         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 727
 728         $(call cmd,vmlinux__)
 729         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 730
 731         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 732           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 733         $(cmd_sysmap) $@ System.map;                                         \
 734         if [ $$? -ne 0 ]; then                                               \
 735                 rm -f $@;                                                    \
 736                 /bin/false;                                                  \
 737         fi;
 738         $(verify_kallsyms)
 739 endef
 740
 741
 742 ifdef CONFIG_KALLSYMS
 743 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 744 # It's a three stage process:
 745 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 746 #   empty
 747 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 748 #   the right size - vmlinux version (uname -v) is updated during this step
 749 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 750 #   but due to the added section, some addresses have shifted.
 751 #   From here, we generate a correct .tmp_kallsyms2.o
 752 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 753 # o Verify that the System.map from vmlinux matches the map from
 754 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 755 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 756 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 757 #   temporary bypass to allow the kernel to be built while the
 758 #   maintainers work out what went wrong with kallsyms.
 759
 760 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 761 last_kallsyms := 3
 762 else
 763 last_kallsyms := 2
 764 endif
 765
 766 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 767
 768 define verify_kallsyms
 769         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 770           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 771           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 772         $(Q)cmp -s System.map .tmp_System.map ||                             \
 773                 (echo Inconsistent kallsyms data;                            \
 774                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 775                  rm .tmp_kallsyms* ; /bin/false )
 776 endef
 777
 778 # Update vmlinux version before link
 779 # Use + in front of this rule to silent warning about make -j1
 780 # First command is ':' to allow us to use + in front of this rule
 781 cmd_ksym_ld = $(cmd_vmlinux__)
 782 define rule_ksym_ld
 783         :
 784         +$(call cmd,vmlinux_version)
 785         $(call cmd,vmlinux__)
 786         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 787 endef
 788
 789 # Generate .S file with all kernel symbols
 790 quiet_cmd_kallsyms = KSYM    $@
 791       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 792                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 793
 794 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 795         $(call if_changed_dep,as_o_S)
 796
 797 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 798         $(call cmd,kallsyms)
 799
 800 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 801 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 802         $(call if_changed_rule,ksym_ld)
 803
 804 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 805         $(call if_changed,vmlinux__)
 806
 807 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 808         $(call if_changed,vmlinux__)
 809
 810 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 811 $(KALLSYMS): scripts ;
 812
 813 # Generate some data for debugging strange kallsyms problems
 814 debug_kallsyms: .tmp_map$(last_kallsyms)
 815
 816 .tmp_map%: .tmp_vmlinux% FORCE
 817         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 818
 819 .tmp_map3: .tmp_map2
 820
 821 .tmp_map2: .tmp_map1
 822
 823 endif # ifdef CONFIG_KALLSYMS
 824
 825 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 826 # relevant sections renamed as per the linker script.
 827 quiet_cmd_vmlinux-modpost = LD      $@
 828       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 829          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 830          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 831 define rule_vmlinux-modpost
 832         :
 833         +$(call cmd,vmlinux-modpost)
 834         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 835         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 836 endef
 837
 838 # vmlinux image - including updated kernel symbols
 839 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 840 ifdef CONFIG_HEADERS_CHECK
 841         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 842 endif
 843 ifdef CONFIG_SAMPLES
 844         $(Q)$(MAKE) $(build)=samples
 845 endif
 846 ifdef CONFIG_BUILD_DOCSRC
 847         $(Q)$(MAKE) $(build)=Documentation
 848 endif
 849         $(call vmlinux-modpost)
 850         $(call if_changed_rule,vmlinux__)
 851         $(Q)rm -f .old_version
 852
 853 # build vmlinux.o first to catch section mismatch errors early
 854 ifdef CONFIG_KALLSYMS
 855 .tmp_vmlinux1: vmlinux.o
 856 endif
 857
 858 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 859 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 860         $(call if_changed_rule,vmlinux-modpost)
 861
 862 # The actual objects are generated when descending,
 863 # make sure no implicit rule kicks in
 864 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 865
 866 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 867 # Preset locale variables to speed up the build process. Limit locale
 868 # tweaks to this spot to avoid wrong language settings when running
 869 # make menuconfig etc.
 870 # Error messages still appears in the original language
 871
 872 PHONY += $(vmlinux-dirs)
 873 $(vmlinux-dirs): prepare scripts
 874         $(Q)$(MAKE) $(build)=$@
 875
 876 # Build the kernel release string
 877 #
 878 # The KERNELRELEASE value built here is stored in the file
 879 # include/config/kernel.release, and is used when executing several
 880 # make targets, such as "make install" or "make modules_install."
 881 #
 882 # The eventual kernel release string consists of the following fields,
 883 # shown in a hierarchical format to show how smaller parts are concatenated
 884 # to form the larger and final value, with values coming from places like
 885 # the Makefile, kernel config options, make command line options and/or
 886 # SCM tag information.
 887 #
 888 #       $(KERNELVERSION)
 889 #         $(VERSION)                    eg, 2
 890 #         $(PATCHLEVEL)                 eg, 6
 891 #         $(SUBLEVEL)                   eg, 18
 892 #         $(EXTRAVERSION)               eg, -rc6
 893 #       $(localver-full)
 894 #         $(localver)
 895 #           localversion*               (files without backups, containing '~')
 896 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 897 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 898 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 899 #           $(LOCALVERSION)             (from make command line if provided)
 900 #
 901 #  Note how the final $(localver-auto) string is included *only* if the
 902 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 903 # moment, only git is supported but other SCMs can edit the script
 904 # scripts/setlocalversion and add the appropriate checks as needed.
 905
 906 pattern = ".*/localversion[^~]*"
 907 string  = $(shell cat /dev/null \
 908            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 909
 910 localver = $(subst $(space),, $(string) \
 911                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 912
 913 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 914 # and if the SCM is know a tag from the SCM is appended.
 915 # The appended tag is determined by the SCM used.
 916 #
 917 # .scmversion is used when generating rpm packages so we do not loose
 918 # the version information from the SCM when we do the build of the kernel
 919 # from the copied source
 920 ifdef CONFIG_LOCALVERSION_AUTO
 921
 922 ifeq ($(wildcard .scmversion),)
 923         _localver-auto = $(shell $(CONFIG_SHELL) \
 924                          $(srctree)/scripts/setlocalversion $(srctree))
 925 else
 926         _localver-auto = $(shell cat .scmversion 2> /dev/null)
 927 endif
 928
 929         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 930 endif
 931
 932 localver-full = $(localver)$(localver-auto)
 933
 934 # Store (new) KERNELRELASE string in include/config/kernel.release
 935 kernelrelease = $(KERNELVERSION)$(localver-full)
 936 include/config/kernel.release: include/config/auto.conf FORCE
 937         $(Q)rm -f $@
 938         $(Q)echo $(kernelrelease) > $@
 939
 940
 941 # Things we need to do before we recursively start building the kernel
 942 # or the modules are listed in "prepare".
 943 # A multi level approach is used. prepareN is processed before prepareN-1.
 944 # archprepare is used in arch Makefiles and when processed asm symlink,
 945 # version.h and scripts_basic is processed / created.
 946
 947 # Listed in dependency order
 948 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 949
 950 # prepare3 is used to check if we are building in a separate output directory,
 951 # and if so do:
 952 # 1) Check that make has not been executed in the kernel src $(srctree)
 953 # 2) Create the include2 directory, used for the second asm symlink
 954 prepare3: include/config/kernel.release
 955 ifneq ($(KBUILD_SRC),)
 956         @$(kecho) '  Using $(srctree) as source for kernel'
 957         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 958                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 959                 echo "  in the '$(srctree)' directory.";\
 960                 /bin/false; \
 961         fi;
 962         $(Q)if [ ! -d include2 ]; then                                  \
 963             mkdir -p include2;                                          \
 964             ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 965         fi
 966 endif
 967
 968 # prepare2 creates a makefile if using a separate output directory
 969 prepare2: prepare3 outputmakefile
 970
 971 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 972                    include/asm include/config/auto.conf
 973         $(cmd_crmodverdir)
 974
 975 archprepare: prepare1 scripts_basic
 976
 977 prepare0: archprepare FORCE
 978         $(Q)$(MAKE) $(build)=.
 979         $(Q)$(MAKE) $(build)=. missing-syscalls
 980
 981 # All the preparing..
 982 prepare: prepare0
 983
 984 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 985 # done in arch/$(ARCH)/kernel/Makefile
 986
 987 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 988
 989 # The asm symlink changes when $(ARCH) changes.
 990 # Detect this and ask user to run make mrproper
 991 # If asm is a stale symlink (point to dir that does not exist) remove it
 992 define check-symlink
 993         set -e;                                                            \
 994         if [ -L include/asm ]; then                                        \
 995                 asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
 996                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
 997                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 998                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 999                         exit 1;                                            \
1000                 fi;                                                        \
1001                 test -e $$asmlink || rm include/asm;                       \
1002         elif [ -d include/asm ]; then                                      \
1003                 echo "ERROR: $@ is a directory but a symlink was expected";\
1004                 exit 1;                                                    \
1005         fi
1006 endef
1007
1008 # We create the target directory of the symlink if it does
1009 # not exist so the test in check-symlink works and we have a
1010 # directory for generated filesas used by some architectures.
1011 define create-symlink
1012         if [ ! -L include/asm ]; then                                      \
1013                         $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1014                         if [ ! -d include/asm-$(SRCARCH) ]; then           \
1015                                 mkdir -p include/asm-$(SRCARCH);           \
1016                         fi;                                                \
1017                         ln -fsn asm-$(SRCARCH) $@;                         \
1018         fi
1019 endef
1020
1021 include/asm: FORCE
1022         $(Q)$(check-symlink)
1023         $(Q)$(create-symlink)
1024
1025 # Generate some files
1026 # ---------------------------------------------------------------------------
1027
1028 # KERNELRELEASE can change from a few different places, meaning version.h
1029 # needs to be updated, so this check is forced on all builds
1030
1031 uts_len := 64
1032 define filechk_utsrelease.h
1033         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1034           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1035           exit 1;                                                         \
1036         fi;                                                               \
1037         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1038 endef
1039
1040 define filechk_version.h
1041         (echo \#define LINUX_VERSION_CODE $(shell                             \
1042         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1043         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1044 endef
1045
1046 include/linux/version.h: $(srctree)/Makefile FORCE
1047         $(call filechk,version.h)
1048
1049 include/linux/utsrelease.h: include/config/kernel.release FORCE
1050         $(call filechk,utsrelease.h)
1051
1052 PHONY += headerdep
1053 headerdep:
1054         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1055
1056 # ---------------------------------------------------------------------------
1057
1058 PHONY += depend dep
1059 depend dep:
1060         @echo '*** Warning: make $@ is unnecessary now.'
1061
1062 # ---------------------------------------------------------------------------
1063 # Firmware install
1064 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1065 export INSTALL_FW_PATH
1066
1067 PHONY += firmware_install
1068 firmware_install: FORCE
1069         @mkdir -p $(objtree)/firmware
1070         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1071
1072 # ---------------------------------------------------------------------------
1073 # Kernel headers
1074
1075 #Default location for installed headers
1076 export INSTALL_HDR_PATH = $(objtree)/usr
1077
1078 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1079 # Find out where the Kbuild file is located to support
1080 # arch/$(ARCH)/include/asm
1081 hdr-dir = $(strip                                                         \
1082           $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1083                arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1084
1085 # If we do an all arch process set dst to asm-$(hdr-arch)
1086 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1087
1088 PHONY += __headers
1089 __headers: include/linux/version.h scripts_basic FORCE
1090         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1091
1092 PHONY += headers_install_all
1093 headers_install_all:
1094         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1095
1096 PHONY += headers_install
1097 headers_install: __headers
1098         $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1099         $(error Headers not exportable for the $(SRCARCH) architecture))
1100         $(Q)$(MAKE) $(hdr-inst)=include
1101         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1102
1103 PHONY += headers_check_all
1104 headers_check_all: headers_install_all
1105         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1106
1107 PHONY += headers_check
1108 headers_check: headers_install
1109         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1110         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1111
1112 # ---------------------------------------------------------------------------
1113 # Modules
1114
1115 ifdef CONFIG_MODULES
1116
1117 # By default, build modules as well
1118
1119 all: modules
1120
1121 #       Build modules
1122 #
1123 #       A module can be listed more than once in obj-m resulting in
1124 #       duplicate lines in modules.order files.  Those are removed
1125 #       using awk while concatenating to the final file.
1126
1127 PHONY += modules
1128 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1129         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1130         @$(kecho) '  Building modules, stage 2.';
1131         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1132         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1133
1134
1135 # Target to prepare building external modules
1136 PHONY += modules_prepare
1137 modules_prepare: prepare scripts
1138
1139 # Target to install modules
1140 PHONY += modules_install
1141 modules_install: _modinst_ _modinst_post
1142
1143 PHONY += _modinst_
1144 _modinst_:
1145         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1146                 echo "Warning: you may need to install module-init-tools"; \
1147                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1148                 sleep 1; \
1149         fi
1150         @rm -rf $(MODLIB)/kernel
1151         @rm -f $(MODLIB)/source
1152         @mkdir -p $(MODLIB)/kernel
1153         @ln -s $(srctree) $(MODLIB)/source
1154         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1155                 rm -f $(MODLIB)/build ; \
1156                 ln -s $(objtree) $(MODLIB)/build ; \
1157         fi
1158         @cp -f $(objtree)/modules.order $(MODLIB)/
1159         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1160
1161 # This depmod is only for convenience to give the initial
1162 # boot a modules.dep even before / is mounted read-write.  However the
1163 # boot script depmod is the master version.
1164 PHONY += _modinst_post
1165 _modinst_post: _modinst_
1166         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1167         $(call cmd,depmod)
1168
1169 else # CONFIG_MODULES
1170
1171 # Modules not configured
1172 # ---------------------------------------------------------------------------
1173
1174 modules modules_install: FORCE
1175         @echo
1176         @echo "The present kernel configuration has modules disabled."
1177         @echo "Type 'make config' and enable loadable module support."
1178         @echo "Then build a kernel with module support enabled."
1179         @echo
1180         @exit 1
1181
1182 endif # CONFIG_MODULES
1183
1184 ###
1185 # Cleaning is done on three levels.
1186 # make clean     Delete most generated files
1187 #                Leave enough to build external modules
1188 # make mrproper  Delete the current configuration, and all generated files
1189 # make distclean Remove editor backup files, patch leftover files and the like
1190
1191 # Directories & files removed with 'make clean'
1192 CLEAN_DIRS  += $(MODVERDIR)
1193 CLEAN_FILES +=  vmlinux System.map \
1194                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1195
1196 # Directories & files removed with 'make mrproper'
1197 MRPROPER_DIRS  += include/config include2 usr/include include/generated
1198 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1199                   include/linux/autoconf.h include/linux/version.h      \
1200                   include/linux/utsrelease.h                            \
1201                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1202                   Module.symvers Module.markers tags TAGS cscope*
1203
1204 # clean - Delete most, but leave enough to build external modules
1205 #
1206 clean: rm-dirs  := $(CLEAN_DIRS)
1207 clean: rm-files := $(CLEAN_FILES)
1208 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1209
1210 PHONY += $(clean-dirs) clean archclean
1211 $(clean-dirs):
1212         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1213
1214 clean: archclean $(clean-dirs)
1215         $(call cmd,rmdirs)
1216         $(call cmd,rmfiles)
1217         @find . $(RCS_FIND_IGNORE) \
1218                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1219                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1220                 -o -name '*.symtypes' -o -name 'modules.order' \
1221                 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \
1222                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1223
1224 # mrproper - Delete all generated files, including .config
1225 #
1226 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1227 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1228 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1229
1230 PHONY += $(mrproper-dirs) mrproper archmrproper
1231 $(mrproper-dirs):
1232         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1233
1234 mrproper: clean archmrproper $(mrproper-dirs)
1235         $(call cmd,rmdirs)
1236         $(call cmd,rmfiles)
1237
1238 # distclean
1239 #
1240 PHONY += distclean
1241
1242 distclean: mrproper
1243         @find $(srctree) $(RCS_FIND_IGNORE) \
1244                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1245                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1246                 -o -name '.*.rej' -o -size 0 \
1247                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1248                 -type f -print | xargs rm -f
1249
1250
1251 # Packaging of the kernel to various formats
1252 # ---------------------------------------------------------------------------
1253 # rpm target kept for backward compatibility
1254 package-dir     := $(srctree)/scripts/package
1255
1256 %pkg: include/config/kernel.release FORCE
1257         $(Q)$(MAKE) $(build)=$(package-dir) $@
1258 rpm: include/config/kernel.release FORCE
1259         $(Q)$(MAKE) $(build)=$(package-dir) $@
1260
1261
1262 # Brief documentation of the typical targets used
1263 # ---------------------------------------------------------------------------
1264
1265 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1266 boards := $(notdir $(boards))
1267 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1268 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1269
1270 help:
1271         @echo  'Cleaning targets:'
1272         @echo  '  clean           - Remove most generated files but keep the config and'
1273         @echo  '                    enough build support to build external modules'
1274         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1275         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1276         @echo  ''
1277         @echo  'Configuration targets:'
1278         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1279         @echo  ''
1280         @echo  'Other generic targets:'
1281         @echo  '  all             - Build all targets marked with [*]'
1282         @echo  '* vmlinux         - Build the bare kernel'
1283         @echo  '* modules         - Build all modules'
1284         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1285         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1286         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1287         @echo  '  dir/            - Build all files in dir and below'
1288         @echo  '  dir/file.[ois]  - Build specified target only'
1289         @echo  '  dir/file.ko     - Build module including final link'
1290         @echo  '  modules_prepare - Set up for building external modules'
1291         @echo  '  tags/TAGS       - Generate tags file for editors'
1292         @echo  '  cscope          - Generate cscope index'
1293         @echo  '  kernelrelease   - Output the release version string'
1294         @echo  '  kernelversion   - Output the version stored in Makefile'
1295         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1296          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1297          echo  ''
1298         @echo  'Static analysers'
1299         @echo  '  checkstack      - Generate a list of stack hogs'
1300         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1301         @echo  '  versioncheck    - Sanity check on version.h usage'
1302         @echo  '  includecheck    - Check for duplicate included header files'
1303         @echo  '  export_report   - List the usages of all exported symbols'
1304         @echo  '  headers_check   - Sanity check on exported headers'
1305         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1306          echo  ''
1307         @echo  'Kernel packaging:'
1308         @$(MAKE) $(build)=$(package-dir) help
1309         @echo  ''
1310         @echo  'Documentation targets:'
1311         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1312         @echo  ''
1313         @echo  'Architecture specific targets ($(SRCARCH)):'
1314         @$(if $(archhelp),$(archhelp),\
1315                 echo '  No architecture specific help defined for $(SRCARCH)')
1316         @echo  ''
1317         @$(if $(boards), \
1318                 $(foreach b, $(boards), \
1319                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1320                 echo '')
1321         @$(if $(board-dirs), \
1322                 $(foreach b, $(board-dirs), \
1323                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1324                 printf "  %-16s - Show all of the above\\n" help-boards; \
1325                 echo '')
1326
1327         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1328         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1329         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1330         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1331         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1332         @echo  ''
1333         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1334         @echo  'For further info see the ./README file'
1335
1336
1337 help-board-dirs := $(addprefix help-,$(board-dirs))
1338
1339 help-boards: $(help-board-dirs)
1340
1341 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1342
1343 $(help-board-dirs): help-%:
1344         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1345         @$(if $(boards-per-dir), \
1346                 $(foreach b, $(boards-per-dir), \
1347                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1348                 echo '')
1349
1350
1351 # Documentation targets
1352 # ---------------------------------------------------------------------------
1353 %docs: scripts_basic FORCE
1354         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1355
1356 else # KBUILD_EXTMOD
1357
1358 ###
1359 # External module support.
1360 # When building external modules the kernel used as basis is considered
1361 # read-only, and no consistency checks are made and the make
1362 # system is not used on the basis kernel. If updates are required
1363 # in the basis kernel ordinary make commands (without M=...) must
1364 # be used.
1365 #
1366 # The following are the only valid targets when building external
1367 # modules.
1368 # make M=dir clean     Delete all automatically generated files
1369 # make M=dir modules   Make all modules in specified dir
1370 # make M=dir           Same as 'make M=dir modules'
1371 # make M=dir modules_install
1372 #                      Install the modules built in the module directory
1373 #                      Assumes install directory is already created
1374
1375 # We are always building modules
1376 KBUILD_MODULES := 1
1377 PHONY += crmodverdir
1378 crmodverdir:
1379         $(cmd_crmodverdir)
1380
1381 PHONY += $(objtree)/Module.symvers
1382 $(objtree)/Module.symvers:
1383         @test -e $(objtree)/Module.symvers || ( \
1384         echo; \
1385         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1386         echo "           is missing; modules will have no dependencies and modversions."; \
1387         echo )
1388
1389 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1390 PHONY += $(module-dirs) modules
1391 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1392         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1393
1394 modules: $(module-dirs)
1395         @$(kecho) '  Building modules, stage 2.';
1396         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1397
1398 PHONY += modules_install
1399 modules_install: _emodinst_ _emodinst_post
1400
1401 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1402 PHONY += _emodinst_
1403 _emodinst_:
1404         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1405         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1406
1407 PHONY += _emodinst_post
1408 _emodinst_post: _emodinst_
1409         $(call cmd,depmod)
1410
1411 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1412
1413 PHONY += $(clean-dirs) clean
1414 $(clean-dirs):
1415         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1416
1417 clean:  rm-dirs := $(MODVERDIR)
1418 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1419                    $(KBUILD_EXTMOD)/Module.markers \
1420                    $(KBUILD_EXTMOD)/modules.order
1421 clean: $(clean-dirs)
1422         $(call cmd,rmdirs)
1423         $(call cmd,rmfiles)
1424         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1425                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1426                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1427                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1428
1429 help:
1430         @echo  '  Building external modules.'
1431         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1432         @echo  ''
1433         @echo  '  modules         - default target, build the module(s)'
1434         @echo  '  modules_install - install the module'
1435         @echo  '  clean           - remove generated files in module directory only'
1436         @echo  ''
1437
1438 # Dummies...
1439 PHONY += prepare scripts
1440 prepare: ;
1441 scripts: ;
1442 endif # KBUILD_EXTMOD
1443
1444 # Generate tags for editors
1445 # ---------------------------------------------------------------------------
1446 quiet_cmd_tags = GEN     $@
1447       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1448
1449 tags TAGS cscope: FORCE
1450         $(call cmd,tags)
1451
1452 # Scripts to check various things for consistency
1453 # ---------------------------------------------------------------------------
1454
1455 includecheck:
1456         find * $(RCS_FIND_IGNORE) \
1457                 -name '*.[hcS]' -type f -print | sort \
1458                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1459
1460 versioncheck:
1461         find * $(RCS_FIND_IGNORE) \
1462                 -name '*.[hcS]' -type f -print | sort \
1463                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1464
1465 namespacecheck:
1466         $(PERL) $(srctree)/scripts/namespace.pl
1467
1468 export_report:
1469         $(PERL) $(srctree)/scripts/export_report.pl
1470
1471 endif #ifeq ($(config-targets),1)
1472 endif #ifeq ($(mixed-targets),1)
1473
1474 PHONY += checkstack kernelrelease kernelversion
1475
1476 # UML needs a little special treatment here.  It wants to use the host
1477 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1478 # else wants $(ARCH), including people doing cross-builds, which means
1479 # that $(SUBARCH) doesn't work here.
1480 ifeq ($(ARCH), um)
1481 CHECKSTACK_ARCH := $(SUBARCH)
1482 else
1483 CHECKSTACK_ARCH := $(ARCH)
1484 endif
1485 checkstack:
1486         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1487         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1488
1489 kernelrelease:
1490         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1491         $(error kernelrelease not valid - run 'make prepare' to update it))
1492 kernelversion:
1493         @echo $(KERNELVERSION)
1494
1495 # Single targets
1496 # ---------------------------------------------------------------------------
1497 # Single targets are compatible with:
1498 # - build with mixed source and output
1499 # - build with separate output dir 'make O=...'
1500 # - external modules
1501 #
1502 #  target-dir => where to store outputfile
1503 #  build-dir  => directory in kernel source tree to use
1504
1505 ifeq ($(KBUILD_EXTMOD),)
1506         build-dir  = $(patsubst %/,%,$(dir $@))
1507         target-dir = $(dir $@)
1508 else
1509         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1510         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1511         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1512 endif
1513
1514 %.s: %.c prepare scripts FORCE
1515         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1516 %.i: %.c prepare scripts FORCE
1517         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1518 %.o: %.c prepare scripts FORCE
1519         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1520 %.lst: %.c prepare scripts FORCE
1521         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1522 %.s: %.S prepare scripts FORCE
1523         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524 %.o: %.S prepare scripts FORCE
1525         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526 %.symtypes: %.c prepare scripts FORCE
1527         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528
1529 # Modules
1530 /: prepare scripts FORCE
1531         $(cmd_crmodverdir)
1532         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1533         $(build)=$(build-dir)
1534 %/: prepare scripts FORCE
1535         $(cmd_crmodverdir)
1536         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1537         $(build)=$(build-dir)
1538 %.ko: prepare scripts FORCE
1539         $(cmd_crmodverdir)
1540         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1541         $(build)=$(build-dir) $(@:.ko=.o)
1542         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1543
1544 # FIXME Should go into a make.lib or something
1545 # ===========================================================================
1546
1547 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1548       cmd_rmdirs = rm -rf $(rm-dirs)
1549
1550 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1551       cmd_rmfiles = rm -f $(rm-files)
1552
1553 # Run depmod only if we have System.map and depmod is executable
1554 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1555       cmd_depmod = \
1556         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1557                 $(DEPMOD) -ae -F System.map                                     \
1558                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1559                 $(KERNELRELEASE);                                               \
1560         fi
1561
1562 # Create temporary dir for module support files
1563 # clean it up only when building all modules
1564 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1565                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1566
1567 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1568           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1569           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1570
1571 quiet_cmd_as_o_S = AS      $@
1572 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1573
1574 # read all saved command lines
1575
1576 targets := $(wildcard $(sort $(targets)))
1577 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1578
1579 ifneq ($(cmd_files),)
1580   $(cmd_files): ;       # Do not try to update included dependency files
1581   include $(cmd_files)
1582 endif
1583
1584 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1585 # Usage:
1586 # $(Q)$(MAKE) $(clean)=dir
1587 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1588
1589 endif   # skip-makefile
1590
1591 PHONY += FORCE
1592 FORCE:
1593
1594 # Declare the contents of the .PHONY variable as phony.  We keep that
1595 # information in a variable so we can use it in if_changed and friends.
1596 .PHONY: $(PHONY)