Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 32
   4 EXTRAVERSION = -rc2
   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 #
 183 # To force ARCH and CROSS_COMPILE settings include kernel.* files
 184 # in the kernel tree - do not patch this file.
 185 export KBUILD_BUILDHOST := $(SUBARCH)
 186
 187 # Kbuild save the ARCH and CROSS_COMPILE setting in kernel.* files.
 188 # Restore these settings and check that user did not specify
 189 # conflicting values.
 190
 191 saved_arch  := $(shell cat include/generated/kernel.arch  2> /dev/null)
 192 saved_cross := $(shell cat include/generated/kernel.cross 2> /dev/null)
 193
 194 ifneq ($(CROSS_COMPILE),)
 195         ifneq ($(saved_cross),)
 196                 ifneq ($(CROSS_COMPILE),$(saved_cross))
 197                         $(error CROSS_COMPILE changed from \
 198                                 "$(saved_cross)" to \
 199                                  to "$(CROSS_COMPILE)". \
 200                                  Use "make mrproper" to fix it up)
 201                 endif
 202         endif
 203 else
 204     CROSS_COMPILE := $(saved_cross)
 205 endif
 206
 207 ifneq ($(ARCH),)
 208         ifneq ($(saved_arch),)
 209                 ifneq ($(saved_arch),$(ARCH))
 210                         $(error ARCH changed from \
 211                                 "$(saved_arch)" to "$(ARCH)". \
 212                                  Use "make mrproper" to fix it up)
 213                 endif
 214         endif
 215 else
 216         ifneq ($(saved_arch),)
 217                 ARCH := $(saved_arch)
 218         else
 219                 ARCH := $(SUBARCH)
 220         endif
 221 endif
 222
 223 # Architecture as present in compile.h
 224 UTS_MACHINE     := $(ARCH)
 225 SRCARCH         := $(ARCH)
 226
 227 # Additional ARCH settings for x86
 228 ifeq ($(ARCH),i386)
 229         SRCARCH := x86
 230 endif
 231 ifeq ($(ARCH),x86_64)
 232         SRCARCH := x86
 233 endif
 234
 235 # Additional ARCH settings for sparc
 236 ifeq ($(ARCH),sparc64)
 237        SRCARCH := sparc
 238 endif
 239
 240 # Additional ARCH settings for sh
 241 ifeq ($(ARCH),sh64)
 242        SRCARCH := sh
 243 endif
 244
 245 # Where to locate arch specific headers
 246 hdr-arch  := $(SRCARCH)
 247
 248 ifeq ($(ARCH),m68knommu)
 249        hdr-arch  := m68k
 250 endif
 251
 252 KCONFIG_CONFIG  ?= .config
 253
 254 # SHELL used by kbuild
 255 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 256           else if [ -x /bin/bash ]; then echo /bin/bash; \
 257           else echo sh; fi ; fi)
 258
 259 HOSTCC       = gcc
 260 HOSTCXX      = g++
 261 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 262 HOSTCXXFLAGS = -O2
 263
 264 # Decide whether to build built-in, modular, or both.
 265 # Normally, just do built-in.
 266
 267 KBUILD_MODULES :=
 268 KBUILD_BUILTIN := 1
 269
 270 #       If we have only "make modules", don't compile built-in objects.
 271 #       When we're building modules with modversions, we need to consider
 272 #       the built-in objects during the descend as well, in order to
 273 #       make sure the checksums are up to date before we record them.
 274
 275 ifeq ($(MAKECMDGOALS),modules)
 276   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 277 endif
 278
 279 #       If we have "make <whatever> modules", compile modules
 280 #       in addition to whatever we do anyway.
 281 #       Just "make" or "make all" shall build modules as well
 282
 283 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 284   KBUILD_MODULES := 1
 285 endif
 286
 287 ifeq ($(MAKECMDGOALS),)
 288   KBUILD_MODULES := 1
 289 endif
 290
 291 export KBUILD_MODULES KBUILD_BUILTIN
 292 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 293
 294 # Beautify output
 295 # ---------------------------------------------------------------------------
 296 #
 297 # Normally, we echo the whole command before executing it. By making
 298 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 299 # $(quiet) to choose other forms of output instead, e.g.
 300 #
 301 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 302 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 303 #
 304 # If $(quiet) is empty, the whole command will be printed.
 305 # If it is set to "quiet_", only the short version will be printed.
 306 # If it is set to "silent_", nothing will be printed at all, since
 307 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 308 #
 309 # A simple variant is to prefix commands with $(Q) - that's useful
 310 # for commands that shall be hidden in non-verbose mode.
 311 #
 312 #       $(Q)ln $@ :<
 313 #
 314 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 315 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 316
 317 ifeq ($(KBUILD_VERBOSE),1)
 318   quiet =
 319   Q =
 320 else
 321   quiet=quiet_
 322   Q = @
 323 endif
 324
 325 # If the user is running make -s (silent mode), suppress echoing of
 326 # commands
 327
 328 ifneq ($(findstring s,$(MAKEFLAGS)),)
 329   quiet=silent_
 330 endif
 331
 332 export quiet Q KBUILD_VERBOSE
 333
 334
 335 # Look for make include files relative to root of kernel src
 336 MAKEFLAGS += --include-dir=$(srctree)
 337
 338 # We need some generic definitions (do not try to remake the file).
 339 $(srctree)/scripts/Kbuild.include: ;
 340 include $(srctree)/scripts/Kbuild.include
 341
 342 # Make variables (CC, etc...)
 343
 344 AS              = $(CROSS_COMPILE)as
 345 LD              = $(CROSS_COMPILE)ld
 346 CC              = $(CROSS_COMPILE)gcc
 347 CPP             = $(CC) -E
 348 AR              = $(CROSS_COMPILE)ar
 349 NM              = $(CROSS_COMPILE)nm
 350 STRIP           = $(CROSS_COMPILE)strip
 351 OBJCOPY         = $(CROSS_COMPILE)objcopy
 352 OBJDUMP         = $(CROSS_COMPILE)objdump
 353 AWK             = awk
 354 GENKSYMS        = scripts/genksyms/genksyms
 355 INSTALLKERNEL  := installkernel
 356 DEPMOD          = /sbin/depmod
 357 KALLSYMS        = scripts/kallsyms
 358 PERL            = perl
 359 CHECK           = sparse
 360
 361 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 362                   -Wbitwise -Wno-return-void $(CF)
 363 MODFLAGS        = -DMODULE
 364 CFLAGS_MODULE   = $(MODFLAGS)
 365 AFLAGS_MODULE   = $(MODFLAGS)
 366 LDFLAGS_MODULE  = -T $(srctree)/scripts/module-common.lds
 367 CFLAGS_KERNEL   =
 368 AFLAGS_KERNEL   =
 369 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 370
 371
 372 # Use LINUXINCLUDE when you must reference the include/ directory.
 373 # Needed to be compatible with the O= option
 374 LINUXINCLUDE    := -Iinclude \
 375                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 376                    -I$(srctree)/arch/$(hdr-arch)/include               \
 377                    -include include/linux/autoconf.h
 378
 379 KBUILD_CPPFLAGS := -D__KERNEL__
 380
 381 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 382                    -fno-strict-aliasing -fno-common \
 383                    -Werror-implicit-function-declaration \
 384                    -Wno-format-security \
 385                    -fno-delete-null-pointer-checks
 386 KBUILD_AFLAGS   := -D__ASSEMBLY__
 387
 388 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 389 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 390 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 391
 392 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 393 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 394 export CPP AR NM STRIP OBJCOPY OBJDUMP
 395 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 396 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 397
 398 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 399 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 400 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 401
 402 # When compiling out-of-tree modules, put MODVERDIR in the module
 403 # tree rather than in the kernel tree. The kernel tree might
 404 # even be read-only.
 405 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 406
 407 # Files to ignore in find ... statements
 408
 409 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
 410 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 411
 412 # ===========================================================================
 413 # Rules shared between *config targets and build targets
 414
 415 # Basic helpers built in scripts/
 416 PHONY += scripts_basic
 417 scripts_basic:
 418         $(Q)$(MAKE) $(build)=scripts/basic
 419
 420 # To avoid any implicit rule to kick in, define an empty command.
 421 scripts/basic/%: scripts_basic ;
 422
 423 PHONY += outputmakefile
 424 # outputmakefile generates a Makefile in the output directory, if using a
 425 # separate output directory. This allows convenient use of make in the
 426 # output directory.
 427 outputmakefile:
 428 ifneq ($(KBUILD_SRC),)
 429         $(Q)ln -fsn $(srctree) source
 430         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 431             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 432 endif
 433
 434 # To make sure we do not include .config for any of the *config targets
 435 # catch them early, and hand them over to scripts/kconfig/Makefile
 436 # It is allowed to specify more targets when calling make, including
 437 # mixing *config targets and build targets.
 438 # For example 'make oldconfig all'.
 439 # Detect when mixed targets is specified, and make a second invocation
 440 # of make so .config is not included in this case either (for *config).
 441
 442 no-dot-config-targets := clean mrproper distclean \
 443                          cscope TAGS tags help %docs check% \
 444                          include/linux/version.h headers_% \
 445                          kernelrelease kernelversion
 446
 447 config-targets := 0
 448 mixed-targets  := 0
 449 dot-config     := 1
 450
 451 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 452         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 453                 dot-config := 0
 454         endif
 455 endif
 456
 457 ifeq ($(KBUILD_EXTMOD),)
 458         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 459                 config-targets := 1
 460                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 461                         mixed-targets := 1
 462                 endif
 463         endif
 464 endif
 465
 466 ifeq ($(mixed-targets),1)
 467 # ===========================================================================
 468 # We're called with mixed targets (*config and build targets).
 469 # Handle them one by one.
 470
 471 %:: FORCE
 472         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 473
 474 else
 475 ifeq ($(config-targets),1)
 476 # ===========================================================================
 477 # *config targets only - make sure prerequisites are updated, and descend
 478 # in scripts/kconfig to make the *config target
 479
 480 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 481 # KBUILD_DEFCONFIG may point out an alternative default configuration
 482 # used for 'make defconfig'
 483 include $(srctree)/arch/$(SRCARCH)/Makefile
 484 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 485
 486 # save ARCH & CROSS_COMPILE settings
 487 $(shell mkdir -p include/generated &&                            \
 488         echo $(ARCH)          > include/generated/kernel.arch && \
 489         echo $(CROSS_COMPILE) > include/generated/kernel.cross)
 490
 491 config: scripts_basic outputmakefile FORCE
 492         $(Q)mkdir -p include/linux include/config
 493         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 494
 495 %config: scripts_basic outputmakefile FORCE
 496         $(Q)mkdir -p include/linux include/config
 497         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 498
 499 else
 500 # ===========================================================================
 501 # Build targets only - this includes vmlinux, arch specific targets, clean
 502 # targets and others. In general all targets except *config targets.
 503
 504 ifeq ($(KBUILD_EXTMOD),)
 505 # Additional helpers built in scripts/
 506 # Carefully list dependencies so we do not try to build scripts twice
 507 # in parallel
 508 PHONY += scripts
 509 scripts: scripts_basic include/config/auto.conf
 510         $(Q)$(MAKE) $(build)=$(@)
 511
 512 # Objects we will link into vmlinux / subdirs we need to visit
 513 init-y          := init/
 514 drivers-y       := drivers/ sound/ firmware/
 515 net-y           := net/
 516 libs-y          := lib/
 517 core-y          := usr/
 518 endif # KBUILD_EXTMOD
 519
 520 ifeq ($(dot-config),1)
 521 # Read in config
 522 -include include/config/auto.conf
 523
 524 ifeq ($(KBUILD_EXTMOD),)
 525 # Read in dependencies to all Kconfig* files, make sure to run
 526 # oldconfig if changes are detected.
 527 -include include/config/auto.conf.cmd
 528
 529 # To avoid any implicit rule to kick in, define an empty command
 530 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 531
 532 # If .config is newer than include/config/auto.conf, someone tinkered
 533 # with it and forgot to run make oldconfig.
 534 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 535 # we execute the config step to be sure to catch updated Kconfig files
 536 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 537         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 538 else
 539 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 540 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 541 PHONY += include/config/auto.conf
 542
 543 include/config/auto.conf:
 544         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 545         echo;                                                           \
 546         echo "  ERROR: Kernel configuration is invalid.";               \
 547         echo "         include/linux/autoconf.h or $@ are missing.";    \
 548         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 549         echo;                                                           \
 550         /bin/false)
 551
 552 endif # KBUILD_EXTMOD
 553
 554 else
 555 # Dummy target needed, because used as prerequisite
 556 include/config/auto.conf: ;
 557 endif # $(dot-config)
 558
 559 # The all: target is the default when no target is given on the
 560 # command line.
 561 # This allow a user to issue only 'make' to build a kernel including modules
 562 # Defaults vmlinux but it is usually overridden in the arch makefile
 563 all: vmlinux
 564
 565 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 566 KBUILD_CFLAGS   += -Os
 567 else
 568 KBUILD_CFLAGS   += -O2
 569 endif
 570
 571 include $(srctree)/arch/$(SRCARCH)/Makefile
 572
 573 ifneq ($(CONFIG_FRAME_WARN),0)
 574 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 575 endif
 576
 577 # Force gcc to behave correct even for buggy distributions
 578 ifndef CONFIG_CC_STACKPROTECTOR
 579 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 580 endif
 581
 582 ifdef CONFIG_FRAME_POINTER
 583 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 584 else
 585 KBUILD_CFLAGS   += -fomit-frame-pointer
 586 endif
 587
 588 ifdef CONFIG_DEBUG_INFO
 589 KBUILD_CFLAGS   += -g
 590 KBUILD_AFLAGS   += -gdwarf-2
 591 endif
 592
 593 ifdef CONFIG_FUNCTION_TRACER
 594 KBUILD_CFLAGS   += -pg
 595 endif
 596
 597 # We trigger additional mismatches with less inlining
 598 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 599 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 600 endif
 601
 602 # arch Makefile may override CC so keep this after arch Makefile is included
 603 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 604 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 605
 606 # warn about C99 declaration after statement
 607 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 608
 609 # disable pointer signed / unsigned warnings in gcc 4.0
 610 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 611
 612 # disable invalid "can't wrap" optimizations for signed / pointers
 613 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 614
 615 # revert to pre-gcc-4.4 behaviour of .eh_frame
 616 KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 617
 618 # conserve stack if available
 619 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 620
 621 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 622 # But warn user when we do so
 623 warn-assign = \
 624 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 625
 626 ifneq ($(KCPPFLAGS),)
 627         $(call warn-assign,CPPFLAGS)
 628         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 629 endif
 630 ifneq ($(KAFLAGS),)
 631         $(call warn-assign,AFLAGS)
 632         KBUILD_AFLAGS += $(KAFLAGS)
 633 endif
 634 ifneq ($(KCFLAGS),)
 635         $(call warn-assign,CFLAGS)
 636         KBUILD_CFLAGS += $(KCFLAGS)
 637 endif
 638
 639 # Use --build-id when available.
 640 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 641                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 642 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 643 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 644
 645 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 646 LDFLAGS_vmlinux += $(call ld-option, -X,)
 647 endif
 648
 649 # Default kernel image to build when no specific target is given.
 650 # KBUILD_IMAGE may be overruled on the command line or
 651 # set in the environment
 652 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 653 # this default value
 654 export KBUILD_IMAGE ?= vmlinux
 655
 656 #
 657 # INSTALL_PATH specifies where to place the updated kernel and system map
 658 # images. Default is /boot, but you can set it to other values
 659 export  INSTALL_PATH ?= /boot
 660
 661 #
 662 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 663 # relocations required by build roots.  This is not defined in the
 664 # makefile but the argument can be passed to make if needed.
 665 #
 666
 667 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 668 export MODLIB
 669
 670 #
 671 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 672 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 673 #  the default option --strip-debug will be used.  Otherwise,
 674 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 675
 676 ifdef INSTALL_MOD_STRIP
 677 ifeq ($(INSTALL_MOD_STRIP),1)
 678 mod_strip_cmd = $(STRIP) --strip-debug
 679 else
 680 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 681 endif # INSTALL_MOD_STRIP=1
 682 else
 683 mod_strip_cmd = true
 684 endif # INSTALL_MOD_STRIP
 685 export mod_strip_cmd
 686
 687
 688 ifeq ($(KBUILD_EXTMOD),)
 689 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 690
 691 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 692                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 693                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 694
 695 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 696                      $(init-n) $(init-) \
 697                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 698                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 699
 700 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 701 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 702 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 703 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 704 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 705 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 706 libs-y          := $(libs-y1) $(libs-y2)
 707
 708 # Build vmlinux
 709 # ---------------------------------------------------------------------------
 710 # vmlinux is built from the objects selected by $(vmlinux-init) and
 711 # $(vmlinux-main). Most are built-in.o files from top-level directories
 712 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 713 # Ordering when linking is important, and $(vmlinux-init) must be first.
 714 #
 715 # vmlinux
 716 #   ^
 717 #   |
 718 #   +-< $(vmlinux-init)
 719 #   |   +--< init/version.o + more
 720 #   |
 721 #   +--< $(vmlinux-main)
 722 #   |    +--< driver/built-in.o mm/built-in.o + more
 723 #   |
 724 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 725 #
 726 # vmlinux version (uname -v) cannot be updated during normal
 727 # descending-into-subdirs phase since we do not yet know if we need to
 728 # update vmlinux.
 729 # Therefore this step is delayed until just before final link of vmlinux -
 730 # except in the kallsyms case where it is done just before adding the
 731 # symbols to the kernel.
 732 #
 733 # System.map is generated to document addresses of all kernel symbols
 734
 735 vmlinux-init := $(head-y) $(init-y)
 736 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 737 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 738 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 739 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 740
 741 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 742 # May be overridden by arch/$(ARCH)/Makefile
 743 quiet_cmd_vmlinux__ ?= LD      $@
 744       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 745       -T $(vmlinux-lds) $(vmlinux-init)                          \
 746       --start-group $(vmlinux-main) --end-group                  \
 747       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 748
 749 # Generate new vmlinux version
 750 quiet_cmd_vmlinux_version = GEN     .version
 751       cmd_vmlinux_version = set -e;                     \
 752         if [ ! -r .version ]; then                      \
 753           rm -f .version;                               \
 754           echo 1 >.version;                             \
 755         else                                            \
 756           mv .version .old_version;                     \
 757           expr 0$$(cat .old_version) + 1 >.version;     \
 758         fi;                                             \
 759         $(MAKE) $(build)=init
 760
 761 # Generate System.map
 762 quiet_cmd_sysmap = SYSMAP
 763       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 764
 765 # Link of vmlinux
 766 # If CONFIG_KALLSYMS is set .version is already updated
 767 # Generate System.map and verify that the content is consistent
 768 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 769 # First command is ':' to allow us to use + in front of the rule
 770 define rule_vmlinux__
 771         :
 772         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 773
 774         $(call cmd,vmlinux__)
 775         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 776
 777         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 778           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 779         $(cmd_sysmap) $@ System.map;                                         \
 780         if [ $$? -ne 0 ]; then                                               \
 781                 rm -f $@;                                                    \
 782                 /bin/false;                                                  \
 783         fi;
 784         $(verify_kallsyms)
 785 endef
 786
 787
 788 ifdef CONFIG_KALLSYMS
 789 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 790 # It's a three stage process:
 791 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 792 #   empty
 793 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 794 #   the right size - vmlinux version (uname -v) is updated during this step
 795 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 796 #   but due to the added section, some addresses have shifted.
 797 #   From here, we generate a correct .tmp_kallsyms2.o
 798 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 799 # o Verify that the System.map from vmlinux matches the map from
 800 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 801 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 802 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 803 #   temporary bypass to allow the kernel to be built while the
 804 #   maintainers work out what went wrong with kallsyms.
 805
 806 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 807 last_kallsyms := 3
 808 else
 809 last_kallsyms := 2
 810 endif
 811
 812 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 813
 814 define verify_kallsyms
 815         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 816           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 817           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 818         $(Q)cmp -s System.map .tmp_System.map ||                             \
 819                 (echo Inconsistent kallsyms data;                            \
 820                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 821                  rm .tmp_kallsyms* ; /bin/false )
 822 endef
 823
 824 # Update vmlinux version before link
 825 # Use + in front of this rule to silent warning about make -j1
 826 # First command is ':' to allow us to use + in front of this rule
 827 cmd_ksym_ld = $(cmd_vmlinux__)
 828 define rule_ksym_ld
 829         :
 830         +$(call cmd,vmlinux_version)
 831         $(call cmd,vmlinux__)
 832         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 833 endef
 834
 835 # Generate .S file with all kernel symbols
 836 quiet_cmd_kallsyms = KSYM    $@
 837       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 838                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 839
 840 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 841         $(call if_changed_dep,as_o_S)
 842
 843 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 844         $(call cmd,kallsyms)
 845
 846 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 847 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 848         $(call if_changed_rule,ksym_ld)
 849
 850 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 851         $(call if_changed,vmlinux__)
 852
 853 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 854         $(call if_changed,vmlinux__)
 855
 856 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 857 $(KALLSYMS): scripts ;
 858
 859 # Generate some data for debugging strange kallsyms problems
 860 debug_kallsyms: .tmp_map$(last_kallsyms)
 861
 862 .tmp_map%: .tmp_vmlinux% FORCE
 863         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 864
 865 .tmp_map3: .tmp_map2
 866
 867 .tmp_map2: .tmp_map1
 868
 869 endif # ifdef CONFIG_KALLSYMS
 870
 871 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 872 # relevant sections renamed as per the linker script.
 873 quiet_cmd_vmlinux-modpost = LD      $@
 874       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 875          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 876          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 877 define rule_vmlinux-modpost
 878         :
 879         +$(call cmd,vmlinux-modpost)
 880         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 881         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 882 endef
 883
 884 # vmlinux image - including updated kernel symbols
 885 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 886 ifdef CONFIG_HEADERS_CHECK
 887         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 888 endif
 889 ifdef CONFIG_SAMPLES
 890         $(Q)$(MAKE) $(build)=samples
 891 endif
 892 ifdef CONFIG_BUILD_DOCSRC
 893         $(Q)$(MAKE) $(build)=Documentation
 894 endif
 895         $(call vmlinux-modpost)
 896         $(call if_changed_rule,vmlinux__)
 897         $(Q)rm -f .old_version
 898
 899 # build vmlinux.o first to catch section mismatch errors early
 900 ifdef CONFIG_KALLSYMS
 901 .tmp_vmlinux1: vmlinux.o
 902 endif
 903
 904 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 905 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 906         $(call if_changed_rule,vmlinux-modpost)
 907
 908 # The actual objects are generated when descending,
 909 # make sure no implicit rule kicks in
 910 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 911
 912 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 913 # Preset locale variables to speed up the build process. Limit locale
 914 # tweaks to this spot to avoid wrong language settings when running
 915 # make menuconfig etc.
 916 # Error messages still appears in the original language
 917
 918 PHONY += $(vmlinux-dirs)
 919 $(vmlinux-dirs): prepare scripts
 920         $(Q)$(MAKE) $(build)=$@
 921
 922 # Build the kernel release string
 923 #
 924 # The KERNELRELEASE value built here is stored in the file
 925 # include/config/kernel.release, and is used when executing several
 926 # make targets, such as "make install" or "make modules_install."
 927 #
 928 # The eventual kernel release string consists of the following fields,
 929 # shown in a hierarchical format to show how smaller parts are concatenated
 930 # to form the larger and final value, with values coming from places like
 931 # the Makefile, kernel config options, make command line options and/or
 932 # SCM tag information.
 933 #
 934 #       $(KERNELVERSION)
 935 #         $(VERSION)                    eg, 2
 936 #         $(PATCHLEVEL)                 eg, 6
 937 #         $(SUBLEVEL)                   eg, 18
 938 #         $(EXTRAVERSION)               eg, -rc6
 939 #       $(localver-full)
 940 #         $(localver)
 941 #           localversion*               (files without backups, containing '~')
 942 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 943 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 944 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 945 #           $(LOCALVERSION)             (from make command line if provided)
 946 #
 947 #  Note how the final $(localver-auto) string is included *only* if the
 948 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 949 # moment, only git is supported but other SCMs can edit the script
 950 # scripts/setlocalversion and add the appropriate checks as needed.
 951
 952 pattern = ".*/localversion[^~]*"
 953 string  = $(shell cat /dev/null \
 954            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 955
 956 localver = $(subst $(space),, $(string) \
 957                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 958
 959 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 960 # and if the SCM is know a tag from the SCM is appended.
 961 # The appended tag is determined by the SCM used.
 962 #
 963 # .scmversion is used when generating rpm packages so we do not loose
 964 # the version information from the SCM when we do the build of the kernel
 965 # from the copied source
 966 ifdef CONFIG_LOCALVERSION_AUTO
 967
 968 ifeq ($(wildcard .scmversion),)
 969         _localver-auto = $(shell $(CONFIG_SHELL) \
 970                          $(srctree)/scripts/setlocalversion $(srctree))
 971 else
 972         _localver-auto = $(shell cat .scmversion 2> /dev/null)
 973 endif
 974
 975         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 976 endif
 977
 978 localver-full = $(localver)$(localver-auto)
 979
 980 # Store (new) KERNELRELASE string in include/config/kernel.release
 981 kernelrelease = $(KERNELVERSION)$(localver-full)
 982 include/config/kernel.release: include/config/auto.conf FORCE
 983         $(Q)rm -f $@
 984         $(Q)echo $(kernelrelease) > $@
 985
 986
 987 # Things we need to do before we recursively start building the kernel
 988 # or the modules are listed in "prepare".
 989 # A multi level approach is used. prepareN is processed before prepareN-1.
 990 # archprepare is used in arch Makefiles and when processed asm symlink,
 991 # version.h and scripts_basic is processed / created.
 992
 993 # Listed in dependency order
 994 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 995
 996 # prepare3 is used to check if we are building in a separate output directory,
 997 # and if so do:
 998 # 1) Check that make has not been executed in the kernel src $(srctree)
 999 # 2) Create the include2 directory, used for the second asm symlink
1000 prepare3: include/config/kernel.release
1001 ifneq ($(KBUILD_SRC),)
1002         @$(kecho) '  Using $(srctree) as source for kernel'
1003         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1004                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
1005                 echo "  in the '$(srctree)' directory.";\
1006                 /bin/false; \
1007         fi;
1008         $(Q)if [ ! -d include2 ]; then                                  \
1009             mkdir -p include2;                                          \
1010             ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
1011         fi
1012 endif
1013
1014 # prepare2 creates a makefile if using a separate output directory
1015 prepare2: prepare3 outputmakefile
1016
1017 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
1018                    include/asm include/config/auto.conf
1019         $(cmd_crmodverdir)
1020
1021 archprepare: prepare1 scripts_basic
1022
1023 prepare0: archprepare FORCE
1024         $(Q)$(MAKE) $(build)=.
1025         $(Q)$(MAKE) $(build)=. missing-syscalls
1026
1027 # All the preparing..
1028 prepare: prepare0
1029
1030 # The asm symlink changes when $(ARCH) changes.
1031 # Detect this and ask user to run make mrproper
1032 # If asm is a stale symlink (point to dir that does not exist) remove it
1033 define check-symlink
1034         set -e;                                                            \
1035         if [ -L include/asm ]; then                                        \
1036                 asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
1037                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
1038                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1039                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
1040                         exit 1;                                            \
1041                 fi;                                                        \
1042                 test -e $$asmlink || rm include/asm;                       \
1043         elif [ -d include/asm ]; then                                      \
1044                 echo "ERROR: $@ is a directory but a symlink was expected";\
1045                 exit 1;                                                    \
1046         fi
1047 endef
1048
1049 # We create the target directory of the symlink if it does
1050 # not exist so the test in check-symlink works and we have a
1051 # directory for generated filesas used by some architectures.
1052 define create-symlink
1053         if [ ! -L include/asm ]; then                                      \
1054                         $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1055                         if [ ! -d include/asm-$(SRCARCH) ]; then           \
1056                                 mkdir -p include/asm-$(SRCARCH);           \
1057                         fi;                                                \
1058                         ln -fsn asm-$(SRCARCH) $@;                         \
1059         fi
1060 endef
1061
1062 include/asm: FORCE
1063         $(Q)$(check-symlink)
1064         $(Q)$(create-symlink)
1065
1066 # Generate some files
1067 # ---------------------------------------------------------------------------
1068
1069 # KERNELRELEASE can change from a few different places, meaning version.h
1070 # needs to be updated, so this check is forced on all builds
1071
1072 uts_len := 64
1073 define filechk_utsrelease.h
1074         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1075           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1076           exit 1;                                                         \
1077         fi;                                                               \
1078         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1079 endef
1080
1081 define filechk_version.h
1082         (echo \#define LINUX_VERSION_CODE $(shell                             \
1083         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1084         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1085 endef
1086
1087 include/linux/version.h: $(srctree)/Makefile FORCE
1088         $(call filechk,version.h)
1089
1090 include/linux/utsrelease.h: include/config/kernel.release FORCE
1091         $(call filechk,utsrelease.h)
1092
1093 PHONY += headerdep
1094 headerdep:
1095         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1096
1097 # ---------------------------------------------------------------------------
1098
1099 PHONY += depend dep
1100 depend dep:
1101         @echo '*** Warning: make $@ is unnecessary now.'
1102
1103 # ---------------------------------------------------------------------------
1104 # Firmware install
1105 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1106 export INSTALL_FW_PATH
1107
1108 PHONY += firmware_install
1109 firmware_install: FORCE
1110         @mkdir -p $(objtree)/firmware
1111         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1112
1113 # ---------------------------------------------------------------------------
1114 # Kernel headers
1115
1116 #Default location for installed headers
1117 export INSTALL_HDR_PATH = $(objtree)/usr
1118
1119 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1120 # Find out where the Kbuild file is located to support
1121 # arch/$(ARCH)/include/asm
1122 hdr-dir = $(strip                                                         \
1123           $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1124                arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1125
1126 # If we do an all arch process set dst to asm-$(hdr-arch)
1127 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1128
1129 PHONY += __headers
1130 __headers: include/linux/version.h scripts_basic FORCE
1131         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1132
1133 PHONY += headers_install_all
1134 headers_install_all:
1135         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1136
1137 PHONY += headers_install
1138 headers_install: __headers
1139         $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1140         $(error Headers not exportable for the $(SRCARCH) architecture))
1141         $(Q)$(MAKE) $(hdr-inst)=include
1142         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1143
1144 PHONY += headers_check_all
1145 headers_check_all: headers_install_all
1146         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1147
1148 PHONY += headers_check
1149 headers_check: headers_install
1150         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1151         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1152
1153 # ---------------------------------------------------------------------------
1154 # Modules
1155
1156 ifdef CONFIG_MODULES
1157
1158 # By default, build modules as well
1159
1160 all: modules
1161
1162 #       Build modules
1163 #
1164 #       A module can be listed more than once in obj-m resulting in
1165 #       duplicate lines in modules.order files.  Those are removed
1166 #       using awk while concatenating to the final file.
1167
1168 PHONY += modules
1169 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1170         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1171         @$(kecho) '  Building modules, stage 2.';
1172         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1173         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1174
1175
1176 # Target to prepare building external modules
1177 PHONY += modules_prepare
1178 modules_prepare: prepare scripts
1179
1180 # Target to install modules
1181 PHONY += modules_install
1182 modules_install: _modinst_ _modinst_post
1183
1184 PHONY += _modinst_
1185 _modinst_:
1186         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1187                 echo "Warning: you may need to install module-init-tools"; \
1188                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1189                 sleep 1; \
1190         fi
1191         @rm -rf $(MODLIB)/kernel
1192         @rm -f $(MODLIB)/source
1193         @mkdir -p $(MODLIB)/kernel
1194         @ln -s $(srctree) $(MODLIB)/source
1195         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1196                 rm -f $(MODLIB)/build ; \
1197                 ln -s $(objtree) $(MODLIB)/build ; \
1198         fi
1199         @cp -f $(objtree)/modules.order $(MODLIB)/
1200         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1201
1202 # This depmod is only for convenience to give the initial
1203 # boot a modules.dep even before / is mounted read-write.  However the
1204 # boot script depmod is the master version.
1205 PHONY += _modinst_post
1206 _modinst_post: _modinst_
1207         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1208         $(call cmd,depmod)
1209
1210 else # CONFIG_MODULES
1211
1212 # Modules not configured
1213 # ---------------------------------------------------------------------------
1214
1215 modules modules_install: FORCE
1216         @echo
1217         @echo "The present kernel configuration has modules disabled."
1218         @echo "Type 'make config' and enable loadable module support."
1219         @echo "Then build a kernel with module support enabled."
1220         @echo
1221         @exit 1
1222
1223 endif # CONFIG_MODULES
1224
1225 ###
1226 # Cleaning is done on three levels.
1227 # make clean     Delete most generated files
1228 #                Leave enough to build external modules
1229 # make mrproper  Delete the current configuration, and all generated files
1230 # make distclean Remove editor backup files, patch leftover files and the like
1231
1232 # Directories & files removed with 'make clean'
1233 CLEAN_DIRS  += $(MODVERDIR)
1234 CLEAN_FILES +=  vmlinux System.map \
1235                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1236
1237 # Directories & files removed with 'make mrproper'
1238 MRPROPER_DIRS  += include/config include2 usr/include include/generated
1239 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1240                   include/linux/autoconf.h include/linux/version.h      \
1241                   include/linux/utsrelease.h                            \
1242                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1243                   Module.symvers Module.markers tags TAGS cscope*
1244
1245 # clean - Delete most, but leave enough to build external modules
1246 #
1247 clean: rm-dirs  := $(CLEAN_DIRS)
1248 clean: rm-files := $(CLEAN_FILES)
1249 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1250
1251 PHONY += $(clean-dirs) clean archclean
1252 $(clean-dirs):
1253         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1254
1255 clean: archclean $(clean-dirs)
1256         $(call cmd,rmdirs)
1257         $(call cmd,rmfiles)
1258         @find . $(RCS_FIND_IGNORE) \
1259                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1260                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1261                 -o -name '*.symtypes' -o -name 'modules.order' \
1262                 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \
1263                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1264
1265 # mrproper - Delete all generated files, including .config
1266 #
1267 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1268 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1269 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1270
1271 PHONY += $(mrproper-dirs) mrproper archmrproper
1272 $(mrproper-dirs):
1273         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1274
1275 mrproper: clean archmrproper $(mrproper-dirs)
1276         $(call cmd,rmdirs)
1277         $(call cmd,rmfiles)
1278
1279 # distclean
1280 #
1281 PHONY += distclean
1282
1283 distclean: mrproper
1284         @find $(srctree) $(RCS_FIND_IGNORE) \
1285                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1286                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1287                 -o -name '.*.rej' -o -size 0 \
1288                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1289                 -type f -print | xargs rm -f
1290
1291
1292 # Packaging of the kernel to various formats
1293 # ---------------------------------------------------------------------------
1294 # rpm target kept for backward compatibility
1295 package-dir     := $(srctree)/scripts/package
1296
1297 %pkg: include/config/kernel.release FORCE
1298         $(Q)$(MAKE) $(build)=$(package-dir) $@
1299 rpm: include/config/kernel.release FORCE
1300         $(Q)$(MAKE) $(build)=$(package-dir) $@
1301
1302
1303 # Brief documentation of the typical targets used
1304 # ---------------------------------------------------------------------------
1305
1306 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1307 boards := $(notdir $(boards))
1308 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1309 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1310
1311 help:
1312         @echo  'Cleaning targets:'
1313         @echo  '  clean           - Remove most generated files but keep the config and'
1314         @echo  '                    enough build support to build external modules'
1315         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1316         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1317         @echo  ''
1318         @echo  'Configuration targets:'
1319         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1320         @echo  ''
1321         @echo  'Other generic targets:'
1322         @echo  '  all             - Build all targets marked with [*]'
1323         @echo  '* vmlinux         - Build the bare kernel'
1324         @echo  '* modules         - Build all modules'
1325         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1326         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1327         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1328         @echo  '  dir/            - Build all files in dir and below'
1329         @echo  '  dir/file.[ois]  - Build specified target only'
1330         @echo  '  dir/file.ko     - Build module including final link'
1331         @echo  '  modules_prepare - Set up for building external modules'
1332         @echo  '  tags/TAGS       - Generate tags file for editors'
1333         @echo  '  cscope          - Generate cscope index'
1334         @echo  '  kernelrelease   - Output the release version string'
1335         @echo  '  kernelversion   - Output the version stored in Makefile'
1336         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1337          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1338          echo  ''
1339         @echo  'Static analysers'
1340         @echo  '  checkstack      - Generate a list of stack hogs'
1341         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1342         @echo  '  versioncheck    - Sanity check on version.h usage'
1343         @echo  '  includecheck    - Check for duplicate included header files'
1344         @echo  '  export_report   - List the usages of all exported symbols'
1345         @echo  '  headers_check   - Sanity check on exported headers'
1346         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1347          echo  ''
1348         @echo  'Kernel packaging:'
1349         @$(MAKE) $(build)=$(package-dir) help
1350         @echo  ''
1351         @echo  'Documentation targets:'
1352         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1353         @echo  ''
1354         @echo  'Architecture specific targets ($(SRCARCH)):'
1355         @$(if $(archhelp),$(archhelp),\
1356                 echo '  No architecture specific help defined for $(SRCARCH)')
1357         @echo  ''
1358         @$(if $(boards), \
1359                 $(foreach b, $(boards), \
1360                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1361                 echo '')
1362         @$(if $(board-dirs), \
1363                 $(foreach b, $(board-dirs), \
1364                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1365                 printf "  %-16s - Show all of the above\\n" help-boards; \
1366                 echo '')
1367
1368         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1369         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1370         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1371         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1372         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1373         @echo  ''
1374         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1375         @echo  'For further info see the ./README file'
1376
1377
1378 help-board-dirs := $(addprefix help-,$(board-dirs))
1379
1380 help-boards: $(help-board-dirs)
1381
1382 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1383
1384 $(help-board-dirs): help-%:
1385         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1386         @$(if $(boards-per-dir), \
1387                 $(foreach b, $(boards-per-dir), \
1388                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1389                 echo '')
1390
1391
1392 # Documentation targets
1393 # ---------------------------------------------------------------------------
1394 %docs: scripts_basic FORCE
1395         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1396
1397 else # KBUILD_EXTMOD
1398
1399 ###
1400 # External module support.
1401 # When building external modules the kernel used as basis is considered
1402 # read-only, and no consistency checks are made and the make
1403 # system is not used on the basis kernel. If updates are required
1404 # in the basis kernel ordinary make commands (without M=...) must
1405 # be used.
1406 #
1407 # The following are the only valid targets when building external
1408 # modules.
1409 # make M=dir clean     Delete all automatically generated files
1410 # make M=dir modules   Make all modules in specified dir
1411 # make M=dir           Same as 'make M=dir modules'
1412 # make M=dir modules_install
1413 #                      Install the modules built in the module directory
1414 #                      Assumes install directory is already created
1415
1416 # We are always building modules
1417 KBUILD_MODULES := 1
1418 PHONY += crmodverdir
1419 crmodverdir:
1420         $(cmd_crmodverdir)
1421
1422 PHONY += $(objtree)/Module.symvers
1423 $(objtree)/Module.symvers:
1424         @test -e $(objtree)/Module.symvers || ( \
1425         echo; \
1426         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1427         echo "           is missing; modules will have no dependencies and modversions."; \
1428         echo )
1429
1430 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1431 PHONY += $(module-dirs) modules
1432 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1433         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1434
1435 modules: $(module-dirs)
1436         @$(kecho) '  Building modules, stage 2.';
1437         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1438
1439 PHONY += modules_install
1440 modules_install: _emodinst_ _emodinst_post
1441
1442 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1443 PHONY += _emodinst_
1444 _emodinst_:
1445         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1446         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1447
1448 PHONY += _emodinst_post
1449 _emodinst_post: _emodinst_
1450         $(call cmd,depmod)
1451
1452 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1453
1454 PHONY += $(clean-dirs) clean
1455 $(clean-dirs):
1456         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1457
1458 clean:  rm-dirs := $(MODVERDIR)
1459 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1460                    $(KBUILD_EXTMOD)/Module.markers \
1461                    $(KBUILD_EXTMOD)/modules.order
1462 clean: $(clean-dirs)
1463         $(call cmd,rmdirs)
1464         $(call cmd,rmfiles)
1465         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1466                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1467                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1468                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1469
1470 help:
1471         @echo  '  Building external modules.'
1472         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1473         @echo  ''
1474         @echo  '  modules         - default target, build the module(s)'
1475         @echo  '  modules_install - install the module'
1476         @echo  '  clean           - remove generated files in module directory only'
1477         @echo  ''
1478
1479 # Dummies...
1480 PHONY += prepare scripts
1481 prepare: ;
1482 scripts: ;
1483 endif # KBUILD_EXTMOD
1484
1485 # Generate tags for editors
1486 # ---------------------------------------------------------------------------
1487 quiet_cmd_tags = GEN     $@
1488       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1489
1490 tags TAGS cscope: FORCE
1491         $(call cmd,tags)
1492
1493 # Scripts to check various things for consistency
1494 # ---------------------------------------------------------------------------
1495
1496 includecheck:
1497         find * $(RCS_FIND_IGNORE) \
1498                 -name '*.[hcS]' -type f -print | sort \
1499                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1500
1501 versioncheck:
1502         find * $(RCS_FIND_IGNORE) \
1503                 -name '*.[hcS]' -type f -print | sort \
1504                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1505
1506 namespacecheck:
1507         $(PERL) $(srctree)/scripts/namespace.pl
1508
1509 export_report:
1510         $(PERL) $(srctree)/scripts/export_report.pl
1511
1512 endif #ifeq ($(config-targets),1)
1513 endif #ifeq ($(mixed-targets),1)
1514
1515 PHONY += checkstack kernelrelease kernelversion
1516
1517 # UML needs a little special treatment here.  It wants to use the host
1518 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1519 # else wants $(ARCH), including people doing cross-builds, which means
1520 # that $(SUBARCH) doesn't work here.
1521 ifeq ($(ARCH), um)
1522 CHECKSTACK_ARCH := $(SUBARCH)
1523 else
1524 CHECKSTACK_ARCH := $(ARCH)
1525 endif
1526 checkstack:
1527         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1528         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1529
1530 kernelrelease:
1531         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1532         $(error kernelrelease not valid - run 'make prepare' to update it))
1533 kernelversion:
1534         @echo $(KERNELVERSION)
1535
1536 # Single targets
1537 # ---------------------------------------------------------------------------
1538 # Single targets are compatible with:
1539 # - build with mixed source and output
1540 # - build with separate output dir 'make O=...'
1541 # - external modules
1542 #
1543 #  target-dir => where to store outputfile
1544 #  build-dir  => directory in kernel source tree to use
1545
1546 ifeq ($(KBUILD_EXTMOD),)
1547         build-dir  = $(patsubst %/,%,$(dir $@))
1548         target-dir = $(dir $@)
1549 else
1550         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1551         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1552         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1553 endif
1554
1555 %.s: %.c prepare scripts FORCE
1556         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1557 %.i: %.c prepare scripts FORCE
1558         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1559 %.o: %.c prepare scripts FORCE
1560         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1561 %.lst: %.c prepare scripts FORCE
1562         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1563 %.s: %.S prepare scripts FORCE
1564         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1565 %.o: %.S prepare scripts FORCE
1566         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1567 %.symtypes: %.c prepare scripts FORCE
1568         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1569
1570 # Modules
1571 /: prepare scripts FORCE
1572         $(cmd_crmodverdir)
1573         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1574         $(build)=$(build-dir)
1575 %/: prepare scripts FORCE
1576         $(cmd_crmodverdir)
1577         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1578         $(build)=$(build-dir)
1579 %.ko: prepare scripts FORCE
1580         $(cmd_crmodverdir)
1581         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1582         $(build)=$(build-dir) $(@:.ko=.o)
1583         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1584
1585 # FIXME Should go into a make.lib or something
1586 # ===========================================================================
1587
1588 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1589       cmd_rmdirs = rm -rf $(rm-dirs)
1590
1591 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1592       cmd_rmfiles = rm -f $(rm-files)
1593
1594 # Run depmod only if we have System.map and depmod is executable
1595 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1596       cmd_depmod = \
1597         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1598                 $(DEPMOD) -ae -F System.map                                     \
1599                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1600                 $(KERNELRELEASE);                                               \
1601         fi
1602
1603 # Create temporary dir for module support files
1604 # clean it up only when building all modules
1605 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1606                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1607
1608 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1609           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1610           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1611
1612 quiet_cmd_as_o_S = AS      $@
1613 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1614
1615 # read all saved command lines
1616
1617 targets := $(wildcard $(sort $(targets)))
1618 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1619
1620 ifneq ($(cmd_files),)
1621   $(cmd_files): ;       # Do not try to update included dependency files
1622   include $(cmd_files)
1623 endif
1624
1625 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1626 # Usage:
1627 # $(Q)$(MAKE) $(clean)=dir
1628 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1629
1630 endif   # skip-makefile
1631
1632 PHONY += FORCE
1633 FORCE:
1634
1635 # Declare the contents of the .PHONY variable as phony.  We keep that
1636 # information in a variable so we can use it in if_changed and friends.
1637 .PHONY: $(PHONY)