Makefile

   1 VERSION = 3
   2 PATCHLEVEL = 7
   3 SUBLEVEL = 6
   4 EXTRAVERSION =
   5 NAME = Terrified Chipmunk
   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 # Avoid funny character set dependencies
  20 unexport LC_ALL
  21 LC_COLLATE=C
  22 LC_NUMERIC=C
  23 export LC_COLLATE LC_NUMERIC
  24
  25 # We are using a recursive build, so we need to do a little thinking
  26 # to get the ordering right.
  27 #
  28 # Most importantly: sub-Makefiles should only ever modify files in
  29 # their own directory. If in some directory we have a dependency on
  30 # a file in another dir (which doesn't happen often, but it's often
  31 # unavoidable when linking the built-in.o targets which finally
  32 # turn into vmlinux), we will call a sub make in that other dir, and
  33 # after that we are sure that everything which is in that other dir
  34 # is now up to date.
  35 #
  36 # The only cases where we need to modify files which have global
  37 # effects are thus separated out and done before the recursive
  38 # descending is started. They are now explicitly listed as the
  39 # prepare rule.
  40
  41 # To put more focus on warnings, be less verbose as default
  42 # Use 'make V=1' to see the full commands
  43
  44 ifeq ("$(origin V)", "command line")
  45   KBUILD_VERBOSE = $(V)
  46 endif
  47 ifndef KBUILD_VERBOSE
  48   KBUILD_VERBOSE = 0
  49 endif
  50
  51 # Call a source code checker (by default, "sparse") as part of the
  52 # C compilation.
  53 #
  54 # Use 'make C=1' to enable checking of only re-compiled files.
  55 # Use 'make C=2' to enable checking of *all* source files, regardless
  56 # of whether they are re-compiled or not.
  57 #
  58 # See the file "Documentation/sparse.txt" for more details, including
  59 # where to get the "sparse" utility.
  60
  61 ifeq ("$(origin C)", "command line")
  62   KBUILD_CHECKSRC = $(C)
  63 endif
  64 ifndef KBUILD_CHECKSRC
  65   KBUILD_CHECKSRC = 0
  66 endif
  67
  68 # Use make M=dir to specify directory of external module to build
  69 # Old syntax make ... SUBDIRS=$PWD is still supported
  70 # Setting the environment variable KBUILD_EXTMOD take precedence
  71 ifdef SUBDIRS
  72   KBUILD_EXTMOD ?= $(SUBDIRS)
  73 endif
  74
  75 ifeq ("$(origin M)", "command line")
  76   KBUILD_EXTMOD := $(M)
  77 endif
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(KBUILD_SRC),)
  98
  99 # OK, Make called in directory where kernel src resides
 100 # Do we want to locate output files in a separate directory?
 101 ifeq ("$(origin O)", "command line")
 102   KBUILD_OUTPUT := $(O)
 103 endif
 104
 105 ifeq ("$(origin W)", "command line")
 106   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 107 endif
 108
 109 # That's our default target when none is given on the command line
 110 PHONY := _all
 111 _all:
 112
 113 # Cancel implicit rules on top Makefile
 114 $(CURDIR)/Makefile Makefile: ;
 115
 116 ifneq ($(KBUILD_OUTPUT),)
 117 # Invoke a second make in the output directory, passing relevant variables
 118 # check that the output directory actually exists
 119 saved-output := $(KBUILD_OUTPUT)
 120 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 121 $(if $(KBUILD_OUTPUT),, \
 122      $(error output directory "$(saved-output)" does not exist))
 123
 124 PHONY += $(MAKECMDGOALS) sub-make
 125
 126 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 127         $(Q)@:
 128
 129 sub-make: FORCE
 130         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 131         KBUILD_SRC=$(CURDIR) \
 132         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 133         $(filter-out _all sub-make,$(MAKECMDGOALS))
 134
 135 # Leave processing to above invocation of make
 136 skip-makefile := 1
 137 endif # ifneq ($(KBUILD_OUTPUT),)
 138 endif # ifeq ($(KBUILD_SRC),)
 139
 140 # We process the rest of the Makefile if this is the final invocation of make
 141 ifeq ($(skip-makefile),)
 142
 143 # If building an external module we do not care about the all: rule
 144 # but instead _all depend on modules
 145 PHONY += all
 146 ifeq ($(KBUILD_EXTMOD),)
 147 _all: all
 148 else
 149 _all: modules
 150 endif
 151
 152 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 153 objtree         := $(CURDIR)
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH
 160
 161
 162 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 163 # first, and if a usermode build is happening, the "ARCH=um" on the command
 164 # line overrides the setting of ARCH below.  If a native build is happening,
 165 # then ARCH is assigned, getting whatever value it gets normally, and
 166 # SUBARCH is subsequently ignored.
 167
 168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 173
 174 # Cross compiling and selecting different set of gcc/bin-utils
 175 # ---------------------------------------------------------------------------
 176 #
 177 # When performing cross compilation for other architectures ARCH shall be set
 178 # to the target architecture. (See arch/* for the possibilities).
 179 # ARCH can be set during invocation of make:
 180 # make ARCH=ia64
 181 # Another way is to have ARCH set in the environment.
 182 # The default ARCH is the host where make is executed.
 183
 184 # CROSS_COMPILE specify the prefix used for all executables used
 185 # during compilation. Only gcc and related bin-utils executables
 186 # are prefixed with $(CROSS_COMPILE).
 187 # CROSS_COMPILE can be set on the command line
 188 # make CROSS_COMPILE=ia64-linux-
 189 # Alternatively CROSS_COMPILE can be set in the environment.
 190 # A third alternative is to store a setting in .config so that plain
 191 # "make" in the configured kernel build directory always uses that.
 192 # Default value for CROSS_COMPILE is not to prefix executables
 193 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 194 export KBUILD_BUILDHOST := $(SUBARCH)
 195 ARCH            ?= $(SUBARCH)
 196 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 197
 198 # Architecture as present in compile.h
 199 UTS_MACHINE     := $(ARCH)
 200 SRCARCH         := $(ARCH)
 201
 202 # Additional ARCH settings for x86
 203 ifeq ($(ARCH),i386)
 204         SRCARCH := x86
 205 endif
 206 ifeq ($(ARCH),x86_64)
 207         SRCARCH := x86
 208 endif
 209
 210 # Additional ARCH settings for sparc
 211 ifeq ($(ARCH),sparc32)
 212        SRCARCH := sparc
 213 endif
 214 ifeq ($(ARCH),sparc64)
 215        SRCARCH := sparc
 216 endif
 217
 218 # Additional ARCH settings for sh
 219 ifeq ($(ARCH),sh64)
 220        SRCARCH := sh
 221 endif
 222
 223 # Additional ARCH settings for tile
 224 ifeq ($(ARCH),tilepro)
 225        SRCARCH := tile
 226 endif
 227 ifeq ($(ARCH),tilegx)
 228        SRCARCH := tile
 229 endif
 230
 231 # Where to locate arch specific headers
 232 hdr-arch  := $(SRCARCH)
 233
 234 KCONFIG_CONFIG  ?= .config
 235 export KCONFIG_CONFIG
 236
 237 # SHELL used by kbuild
 238 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 239           else if [ -x /bin/bash ]; then echo /bin/bash; \
 240           else echo sh; fi ; fi)
 241
 242 HOSTCC       = gcc
 243 HOSTCXX      = g++
 244 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 245 HOSTCXXFLAGS = -O2
 246
 247 # Decide whether to build built-in, modular, or both.
 248 # Normally, just do built-in.
 249
 250 KBUILD_MODULES :=
 251 KBUILD_BUILTIN := 1
 252
 253 #       If we have only "make modules", don't compile built-in objects.
 254 #       When we're building modules with modversions, we need to consider
 255 #       the built-in objects during the descend as well, in order to
 256 #       make sure the checksums are up to date before we record them.
 257
 258 ifeq ($(MAKECMDGOALS),modules)
 259   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 260 endif
 261
 262 #       If we have "make <whatever> modules", compile modules
 263 #       in addition to whatever we do anyway.
 264 #       Just "make" or "make all" shall build modules as well
 265
 266 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 267   KBUILD_MODULES := 1
 268 endif
 269
 270 ifeq ($(MAKECMDGOALS),)
 271   KBUILD_MODULES := 1
 272 endif
 273
 274 export KBUILD_MODULES KBUILD_BUILTIN
 275 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 276
 277 # Beautify output
 278 # ---------------------------------------------------------------------------
 279 #
 280 # Normally, we echo the whole command before executing it. By making
 281 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 282 # $(quiet) to choose other forms of output instead, e.g.
 283 #
 284 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 285 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 286 #
 287 # If $(quiet) is empty, the whole command will be printed.
 288 # If it is set to "quiet_", only the short version will be printed.
 289 # If it is set to "silent_", nothing will be printed at all, since
 290 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 291 #
 292 # A simple variant is to prefix commands with $(Q) - that's useful
 293 # for commands that shall be hidden in non-verbose mode.
 294 #
 295 #       $(Q)ln $@ :<
 296 #
 297 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 298 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 299
 300 ifeq ($(KBUILD_VERBOSE),1)
 301   quiet =
 302   Q =
 303 else
 304   quiet=quiet_
 305   Q = @
 306 endif
 307
 308 # If the user is running make -s (silent mode), suppress echoing of
 309 # commands
 310
 311 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 312   quiet=silent_
 313 endif
 314
 315 export quiet Q KBUILD_VERBOSE
 316
 317
 318 # Look for make include files relative to root of kernel src
 319 MAKEFLAGS += --include-dir=$(srctree)
 320
 321 # We need some generic definitions (do not try to remake the file).
 322 $(srctree)/scripts/Kbuild.include: ;
 323 include $(srctree)/scripts/Kbuild.include
 324
 325 # Make variables (CC, etc...)
 326
 327 AS              = $(CROSS_COMPILE)as
 328 LD              = $(CROSS_COMPILE)ld
 329 CC              = $(CROSS_COMPILE)gcc
 330 CPP             = $(CC) -E
 331 AR              = $(CROSS_COMPILE)ar
 332 NM              = $(CROSS_COMPILE)nm
 333 STRIP           = $(CROSS_COMPILE)strip
 334 OBJCOPY         = $(CROSS_COMPILE)objcopy
 335 OBJDUMP         = $(CROSS_COMPILE)objdump
 336 AWK             = awk
 337 GENKSYMS        = scripts/genksyms/genksyms
 338 INSTALLKERNEL  := installkernel
 339 DEPMOD          = /sbin/depmod
 340 PERL            = perl
 341 CHECK           = sparse
 342
 343 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 344                   -Wbitwise -Wno-return-void $(CF)
 345 CFLAGS_MODULE   =
 346 AFLAGS_MODULE   =
 347 LDFLAGS_MODULE  =
 348 CFLAGS_KERNEL   =
 349 AFLAGS_KERNEL   =
 350 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 351
 352
 353 # Use USERINCLUDE when you must reference the UAPI directories only.
 354 USERINCLUDE    := \
 355                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 356                 -Iarch/$(hdr-arch)/include/generated/uapi \
 357                 -I$(srctree)/include/uapi \
 358                 -Iinclude/generated/uapi \
 359                 -include $(srctree)/include/linux/kconfig.h
 360
 361 # Use LINUXINCLUDE when you must reference the include/ directory.
 362 # Needed to be compatible with the O= option
 363 LINUXINCLUDE    := \
 364                 -I$(srctree)/arch/$(hdr-arch)/include \
 365                 -Iarch/$(hdr-arch)/include/generated \
 366                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 367                 -Iinclude \
 368                 $(USERINCLUDE)
 369
 370 KBUILD_CPPFLAGS := -D__KERNEL__
 371
 372 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 373                    -fno-strict-aliasing -fno-common \
 374                    -Werror-implicit-function-declaration \
 375                    -Wno-format-security \
 376                    -fno-delete-null-pointer-checks
 377 KBUILD_AFLAGS_KERNEL :=
 378 KBUILD_CFLAGS_KERNEL :=
 379 KBUILD_AFLAGS   := -D__ASSEMBLY__
 380 KBUILD_AFLAGS_MODULE  := -DMODULE
 381 KBUILD_CFLAGS_MODULE  := -DMODULE
 382 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 383
 384 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 385 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 386 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 387
 388 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 389 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 390 export CPP AR NM STRIP OBJCOPY OBJDUMP
 391 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 392 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 393
 394 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 395 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 396 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 397 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 398 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 399 export KBUILD_ARFLAGS
 400
 401 # When compiling out-of-tree modules, put MODVERDIR in the module
 402 # tree rather than in the kernel tree. The kernel tree might
 403 # even be read-only.
 404 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 405
 406 # Files to ignore in find ... statements
 407
 408 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
 409                    -o -name .pc -o -name .hg -o -name .git \) -prune -o
 410 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 411                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 412
 413 # ===========================================================================
 414 # Rules shared between *config targets and build targets
 415
 416 # Basic helpers built in scripts/
 417 PHONY += scripts_basic
 418 scripts_basic:
 419         $(Q)$(MAKE) $(build)=scripts/basic
 420         $(Q)rm -f .tmp_quiet_recordmcount
 421
 422 # To avoid any implicit rule to kick in, define an empty command.
 423 scripts/basic/%: scripts_basic ;
 424
 425 PHONY += outputmakefile
 426 # outputmakefile generates a Makefile in the output directory, if using a
 427 # separate output directory. This allows convenient use of make in the
 428 # output directory.
 429 outputmakefile:
 430 ifneq ($(KBUILD_SRC),)
 431         $(Q)ln -fsn $(srctree) source
 432         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 433             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 434 endif
 435
 436 # Support for using generic headers in asm-generic
 437 PHONY += asm-generic
 438 asm-generic:
 439         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 440                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 441         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 442                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 443
 444 # To make sure we do not include .config for any of the *config targets
 445 # catch them early, and hand them over to scripts/kconfig/Makefile
 446 # It is allowed to specify more targets when calling make, including
 447 # mixing *config targets and build targets.
 448 # For example 'make oldconfig all'.
 449 # Detect when mixed targets is specified, and make a second invocation
 450 # of make so .config is not included in this case either (for *config).
 451
 452 version_h := include/generated/uapi/linux/version.h
 453
 454 no-dot-config-targets := clean mrproper distclean \
 455                          cscope gtags TAGS tags help %docs check% coccicheck \
 456                          $(version_h) headers_% archheaders archscripts \
 457                          kernelversion %src-pkg
 458
 459 config-targets := 0
 460 mixed-targets  := 0
 461 dot-config     := 1
 462
 463 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 464         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 465                 dot-config := 0
 466         endif
 467 endif
 468
 469 ifeq ($(KBUILD_EXTMOD),)
 470         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 471                 config-targets := 1
 472                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 473                         mixed-targets := 1
 474                 endif
 475         endif
 476 endif
 477
 478 ifeq ($(mixed-targets),1)
 479 # ===========================================================================
 480 # We're called with mixed targets (*config and build targets).
 481 # Handle them one by one.
 482
 483 %:: FORCE
 484         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 485
 486 else
 487 ifeq ($(config-targets),1)
 488 # ===========================================================================
 489 # *config targets only - make sure prerequisites are updated, and descend
 490 # in scripts/kconfig to make the *config target
 491
 492 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 493 # KBUILD_DEFCONFIG may point out an alternative default configuration
 494 # used for 'make defconfig'
 495 include $(srctree)/arch/$(SRCARCH)/Makefile
 496 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 497
 498 config: scripts_basic outputmakefile FORCE
 499         $(Q)mkdir -p include/linux include/config
 500         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 501
 502 %config: scripts_basic outputmakefile FORCE
 503         $(Q)mkdir -p include/linux include/config
 504         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 505
 506 else
 507 # ===========================================================================
 508 # Build targets only - this includes vmlinux, arch specific targets, clean
 509 # targets and others. In general all targets except *config targets.
 510
 511 ifeq ($(KBUILD_EXTMOD),)
 512 # Additional helpers built in scripts/
 513 # Carefully list dependencies so we do not try to build scripts twice
 514 # in parallel
 515 PHONY += scripts
 516 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 517         $(Q)$(MAKE) $(build)=$(@)
 518
 519 # Objects we will link into vmlinux / subdirs we need to visit
 520 init-y          := init/
 521 drivers-y       := drivers/ sound/ firmware/
 522 net-y           := net/
 523 libs-y          := lib/
 524 core-y          := usr/
 525 endif # KBUILD_EXTMOD
 526
 527 ifeq ($(dot-config),1)
 528 # Read in config
 529 -include include/config/auto.conf
 530
 531 ifeq ($(KBUILD_EXTMOD),)
 532 # Read in dependencies to all Kconfig* files, make sure to run
 533 # oldconfig if changes are detected.
 534 -include include/config/auto.conf.cmd
 535
 536 # To avoid any implicit rule to kick in, define an empty command
 537 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 538
 539 # If .config is newer than include/config/auto.conf, someone tinkered
 540 # with it and forgot to run make oldconfig.
 541 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 542 # we execute the config step to be sure to catch updated Kconfig files
 543 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 544         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 545 else
 546 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 547 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 548 PHONY += include/config/auto.conf
 549
 550 include/config/auto.conf:
 551         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 552         echo >&2;                                                       \
 553         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 554         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 555         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 556         echo >&2 ;                                                      \
 557         /bin/false)
 558
 559 endif # KBUILD_EXTMOD
 560
 561 else
 562 # Dummy target needed, because used as prerequisite
 563 include/config/auto.conf: ;
 564 endif # $(dot-config)
 565
 566 # The all: target is the default when no target is given on the
 567 # command line.
 568 # This allow a user to issue only 'make' to build a kernel including modules
 569 # Defaults to vmlinux, but the arch makefile usually adds further targets
 570 all: vmlinux
 571
 572 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 573 KBUILD_CFLAGS   += -Os
 574 else
 575 KBUILD_CFLAGS   += -O2
 576 endif
 577
 578 include $(srctree)/arch/$(SRCARCH)/Makefile
 579
 580 ifdef CONFIG_READABLE_ASM
 581 # Disable optimizations that make assembler listings hard to read.
 582 # reorder blocks reorders the control in the function
 583 # ipa clone creates specialized cloned functions
 584 # partial inlining inlines only parts of functions
 585 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 586                  $(call cc-option,-fno-ipa-cp-clone,) \
 587                  $(call cc-option,-fno-partial-inlining)
 588 endif
 589
 590 ifneq ($(CONFIG_FRAME_WARN),0)
 591 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 592 endif
 593
 594 # Force gcc to behave correct even for buggy distributions
 595 ifndef CONFIG_CC_STACKPROTECTOR
 596 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 597 endif
 598
 599 # This warning generated too much noise in a regular build.
 600 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 601 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 602
 603 ifdef CONFIG_FRAME_POINTER
 604 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 605 else
 606 # Some targets (ARM with Thumb2, for example), can't be built with frame
 607 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 608 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 609 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 610 # -fomit-frame-pointer with FUNCTION_TRACER.
 611 ifndef CONFIG_FUNCTION_TRACER
 612 KBUILD_CFLAGS   += -fomit-frame-pointer
 613 endif
 614 endif
 615
 616 ifdef CONFIG_DEBUG_INFO
 617 KBUILD_CFLAGS   += -g
 618 KBUILD_AFLAGS   += -gdwarf-2
 619 endif
 620
 621 ifdef CONFIG_DEBUG_INFO_REDUCED
 622 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 623 endif
 624
 625 ifdef CONFIG_FUNCTION_TRACER
 626 ifdef CONFIG_HAVE_FENTRY
 627 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 628 endif
 629 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
 630 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 631 ifdef CONFIG_DYNAMIC_FTRACE
 632         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 633                 BUILD_C_RECORDMCOUNT := y
 634                 export BUILD_C_RECORDMCOUNT
 635         endif
 636 endif
 637 endif
 638
 639 # We trigger additional mismatches with less inlining
 640 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 641 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 642 endif
 643
 644 # arch Makefile may override CC so keep this after arch Makefile is included
 645 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 646 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 647
 648 # warn about C99 declaration after statement
 649 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 650
 651 # disable pointer signed / unsigned warnings in gcc 4.0
 652 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 653
 654 # disable invalid "can't wrap" optimizations for signed / pointers
 655 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 656
 657 # conserve stack if available
 658 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 659
 660 # use the deterministic mode of AR if available
 661 KBUILD_ARFLAGS := $(call ar-option,D)
 662
 663 # check for 'asm goto'
 664 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 665         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 666 endif
 667
 668 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 669 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 670 KBUILD_AFLAGS += $(KAFLAGS)
 671 KBUILD_CFLAGS += $(KCFLAGS)
 672
 673 # Use --build-id when available.
 674 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 675                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 676 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 677 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 678
 679 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 680 LDFLAGS_vmlinux += $(call ld-option, -X,)
 681 endif
 682
 683 # Default kernel image to build when no specific target is given.
 684 # KBUILD_IMAGE may be overruled on the command line or
 685 # set in the environment
 686 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 687 # this default value
 688 export KBUILD_IMAGE ?= vmlinux
 689
 690 #
 691 # INSTALL_PATH specifies where to place the updated kernel and system map
 692 # images. Default is /boot, but you can set it to other values
 693 export  INSTALL_PATH ?= /boot
 694
 695 #
 696 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 697 # relocations required by build roots.  This is not defined in the
 698 # makefile but the argument can be passed to make if needed.
 699 #
 700
 701 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 702 export MODLIB
 703
 704 #
 705 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 706 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 707 #  the default option --strip-debug will be used.  Otherwise,
 708 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 709
 710 ifdef INSTALL_MOD_STRIP
 711 ifeq ($(INSTALL_MOD_STRIP),1)
 712 mod_strip_cmd = $(STRIP) --strip-debug
 713 else
 714 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 715 endif # INSTALL_MOD_STRIP=1
 716 else
 717 mod_strip_cmd = true
 718 endif # INSTALL_MOD_STRIP
 719 export mod_strip_cmd
 720
 721
 722 ifeq ($(CONFIG_MODULE_SIG),y)
 723 MODSECKEY = ./signing_key.priv
 724 MODPUBKEY = ./signing_key.x509
 725 export MODPUBKEY
 726 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(MODSECKEY) $(MODPUBKEY)
 727 else
 728 mod_sign_cmd = true
 729 endif
 730 export mod_sign_cmd
 731
 732
 733 ifeq ($(KBUILD_EXTMOD),)
 734 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 735
 736 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 737                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 738                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 739
 740 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 741                      $(init-n) $(init-) \
 742                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 743                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 744
 745 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 746 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 747 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 748 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 749 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 750 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 751 libs-y          := $(libs-y1) $(libs-y2)
 752
 753 # Externally visible symbols (used by link-vmlinux.sh)
 754 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 755 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 756 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 757 export LDFLAGS_vmlinux
 758
 759 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 760
 761 # Final link of vmlinux
 762       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 763 quiet_cmd_link-vmlinux = LINK    $@
 764
 765 # Include targets which we want to
 766 # execute if the rest of the kernel build went well.
 767 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 768 ifdef CONFIG_HEADERS_CHECK
 769         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 770 endif
 771 ifdef CONFIG_SAMPLES
 772         $(Q)$(MAKE) $(build)=samples
 773 endif
 774 ifdef CONFIG_BUILD_DOCSRC
 775         $(Q)$(MAKE) $(build)=Documentation
 776 endif
 777         +$(call if_changed,link-vmlinux)
 778
 779 # The actual objects are generated when descending,
 780 # make sure no implicit rule kicks in
 781 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 782
 783 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 784 # Preset locale variables to speed up the build process. Limit locale
 785 # tweaks to this spot to avoid wrong language settings when running
 786 # make menuconfig etc.
 787 # Error messages still appears in the original language
 788
 789 PHONY += $(vmlinux-dirs)
 790 $(vmlinux-dirs): prepare scripts
 791         $(Q)$(MAKE) $(build)=$@
 792
 793 # Store (new) KERNELRELASE string in include/config/kernel.release
 794 include/config/kernel.release: include/config/auto.conf FORCE
 795         $(Q)rm -f $@
 796         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 797
 798
 799 # Things we need to do before we recursively start building the kernel
 800 # or the modules are listed in "prepare".
 801 # A multi level approach is used. prepareN is processed before prepareN-1.
 802 # archprepare is used in arch Makefiles and when processed asm symlink,
 803 # version.h and scripts_basic is processed / created.
 804
 805 # Listed in dependency order
 806 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 807
 808 # prepare3 is used to check if we are building in a separate output directory,
 809 # and if so do:
 810 # 1) Check that make has not been executed in the kernel src $(srctree)
 811 prepare3: include/config/kernel.release
 812 ifneq ($(KBUILD_SRC),)
 813         @$(kecho) '  Using $(srctree) as source for kernel'
 814         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 815                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 816                 echo >&2 "  in the '$(srctree)' directory.";\
 817                 /bin/false; \
 818         fi;
 819 endif
 820
 821 # prepare2 creates a makefile if using a separate output directory
 822 prepare2: prepare3 outputmakefile asm-generic
 823
 824 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 825                    include/config/auto.conf
 826         $(cmd_crmodverdir)
 827
 828 archprepare: archheaders archscripts prepare1 scripts_basic
 829
 830 prepare0: archprepare FORCE
 831         $(Q)$(MAKE) $(build)=.
 832
 833 # All the preparing..
 834 prepare: prepare0
 835
 836 # Generate some files
 837 # ---------------------------------------------------------------------------
 838
 839 # KERNELRELEASE can change from a few different places, meaning version.h
 840 # needs to be updated, so this check is forced on all builds
 841
 842 uts_len := 64
 843 define filechk_utsrelease.h
 844         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 845           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 846           exit 1;                                                         \
 847         fi;                                                               \
 848         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 849 endef
 850
 851 define filechk_version.h
 852         (echo \#define LINUX_VERSION_CODE $(shell                         \
 853         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 854         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 855 endef
 856
 857 $(version_h): $(srctree)/Makefile FORCE
 858         $(call filechk,version.h)
 859
 860 include/generated/utsrelease.h: include/config/kernel.release FORCE
 861         $(call filechk,utsrelease.h)
 862
 863 PHONY += headerdep
 864 headerdep:
 865         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 866         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 867
 868 # ---------------------------------------------------------------------------
 869
 870 PHONY += depend dep
 871 depend dep:
 872         @echo '*** Warning: make $@ is unnecessary now.'
 873
 874 # ---------------------------------------------------------------------------
 875 # Firmware install
 876 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 877 export INSTALL_FW_PATH
 878
 879 PHONY += firmware_install
 880 firmware_install: FORCE
 881         @mkdir -p $(objtree)/firmware
 882         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 883
 884 # ---------------------------------------------------------------------------
 885 # Kernel headers
 886
 887 #Default location for installed headers
 888 export INSTALL_HDR_PATH = $(objtree)/usr
 889
 890 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 891
 892 # If we do an all arch process set dst to asm-$(hdr-arch)
 893 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 894
 895 PHONY += archheaders
 896 archheaders:
 897
 898 PHONY += archscripts
 899 archscripts:
 900
 901 PHONY += __headers
 902 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
 903         $(Q)$(MAKE) $(build)=scripts build_unifdef
 904
 905 PHONY += headers_install_all
 906 headers_install_all:
 907         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
 908
 909 PHONY += headers_install
 910 headers_install: __headers
 911         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
 912           $(error Headers not exportable for the $(SRCARCH) architecture))
 913         $(Q)$(MAKE) $(hdr-inst)=include/uapi
 914         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
 915
 916 PHONY += headers_check_all
 917 headers_check_all: headers_install_all
 918         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
 919
 920 PHONY += headers_check
 921 headers_check: headers_install
 922         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
 923         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
 924
 925 # ---------------------------------------------------------------------------
 926 # Modules
 927
 928 ifdef CONFIG_MODULES
 929
 930 # By default, build modules as well
 931
 932 all: modules
 933
 934 #       Build modules
 935 #
 936 #       A module can be listed more than once in obj-m resulting in
 937 #       duplicate lines in modules.order files.  Those are removed
 938 #       using awk while concatenating to the final file.
 939
 940 PHONY += modules
 941 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
 942         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
 943         @$(kecho) '  Building modules, stage 2.';
 944         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 945         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
 946
 947 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
 948         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
 949
 950 %/modules.builtin: include/config/auto.conf
 951         $(Q)$(MAKE) $(modbuiltin)=$*
 952
 953
 954 # Target to prepare building external modules
 955 PHONY += modules_prepare
 956 modules_prepare: prepare scripts
 957
 958 # Target to install modules
 959 PHONY += modules_install
 960 modules_install: _modinst_ _modinst_post
 961
 962 PHONY += _modinst_
 963 _modinst_:
 964         @rm -rf $(MODLIB)/kernel
 965         @rm -f $(MODLIB)/source
 966         @mkdir -p $(MODLIB)/kernel
 967         @ln -s $(srctree) $(MODLIB)/source
 968         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 969                 rm -f $(MODLIB)/build ; \
 970                 ln -s $(objtree) $(MODLIB)/build ; \
 971         fi
 972         @cp -f $(objtree)/modules.order $(MODLIB)/
 973         @cp -f $(objtree)/modules.builtin $(MODLIB)/
 974         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
 975
 976 # This depmod is only for convenience to give the initial
 977 # boot a modules.dep even before / is mounted read-write.  However the
 978 # boot script depmod is the master version.
 979 PHONY += _modinst_post
 980 _modinst_post: _modinst_
 981         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
 982         $(call cmd,depmod)
 983
 984 else # CONFIG_MODULES
 985
 986 # Modules not configured
 987 # ---------------------------------------------------------------------------
 988
 989 modules modules_install: FORCE
 990         @echo >&2
 991         @echo >&2 "The present kernel configuration has modules disabled."
 992         @echo >&2 "Type 'make config' and enable loadable module support."
 993         @echo >&2 "Then build a kernel with module support enabled."
 994         @echo >&2
 995         @exit 1
 996
 997 endif # CONFIG_MODULES
 998
 999 ###
1000 # Cleaning is done on three levels.
1001 # make clean     Delete most generated files
1002 #                Leave enough to build external modules
1003 # make mrproper  Delete the current configuration, and all generated files
1004 # make distclean Remove editor backup files, patch leftover files and the like
1005
1006 # Directories & files removed with 'make clean'
1007 CLEAN_DIRS  += $(MODVERDIR)
1008
1009 # Directories & files removed with 'make mrproper'
1010 MRPROPER_DIRS  += include/config usr/include include/generated          \
1011                   arch/*/include/generated
1012 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1013                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1014                   signing_key.priv signing_key.x509 x509.genkey         \
1015                   extra_certificates signing_key.x509.keyid             \
1016                   signing_key.x509.signer
1017
1018 # clean - Delete most, but leave enough to build external modules
1019 #
1020 clean: rm-dirs  := $(CLEAN_DIRS)
1021 clean: rm-files := $(CLEAN_FILES)
1022 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1023
1024 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1025 $(clean-dirs):
1026         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1027
1028 vmlinuxclean:
1029         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1030
1031 clean: archclean vmlinuxclean
1032
1033 # mrproper - Delete all generated files, including .config
1034 #
1035 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1036 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1037 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1038
1039 PHONY += $(mrproper-dirs) mrproper archmrproper
1040 $(mrproper-dirs):
1041         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1042
1043 mrproper: clean archmrproper $(mrproper-dirs)
1044         $(call cmd,rmdirs)
1045         $(call cmd,rmfiles)
1046
1047 # distclean
1048 #
1049 PHONY += distclean
1050
1051 distclean: mrproper
1052         @find $(srctree) $(RCS_FIND_IGNORE) \
1053                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1054                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1055                 -o -name '.*.rej' \
1056                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1057                 -type f -print | xargs rm -f
1058
1059
1060 # Packaging of the kernel to various formats
1061 # ---------------------------------------------------------------------------
1062 # rpm target kept for backward compatibility
1063 package-dir     := $(srctree)/scripts/package
1064
1065 %src-pkg: FORCE
1066         $(Q)$(MAKE) $(build)=$(package-dir) $@
1067 %pkg: include/config/kernel.release FORCE
1068         $(Q)$(MAKE) $(build)=$(package-dir) $@
1069 rpm: include/config/kernel.release FORCE
1070         $(Q)$(MAKE) $(build)=$(package-dir) $@
1071
1072
1073 # Brief documentation of the typical targets used
1074 # ---------------------------------------------------------------------------
1075
1076 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1077 boards := $(notdir $(boards))
1078 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1079 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1080
1081 help:
1082         @echo  'Cleaning targets:'
1083         @echo  '  clean           - Remove most generated files but keep the config and'
1084         @echo  '                    enough build support to build external modules'
1085         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1086         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1087         @echo  ''
1088         @echo  'Configuration targets:'
1089         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1090         @echo  ''
1091         @echo  'Other generic targets:'
1092         @echo  '  all             - Build all targets marked with [*]'
1093         @echo  '* vmlinux         - Build the bare kernel'
1094         @echo  '* modules         - Build all modules'
1095         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1096         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1097         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1098         @echo  '  dir/            - Build all files in dir and below'
1099         @echo  '  dir/file.[oisS] - Build specified target only'
1100         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1101         @echo  '                    (requires a recent binutils and recent build (System.map))'
1102         @echo  '  dir/file.ko     - Build module including final link'
1103         @echo  '  modules_prepare - Set up for building external modules'
1104         @echo  '  tags/TAGS       - Generate tags file for editors'
1105         @echo  '  cscope          - Generate cscope index'
1106         @echo  '  gtags           - Generate GNU GLOBAL index'
1107         @echo  '  kernelrelease   - Output the release version string'
1108         @echo  '  kernelversion   - Output the version stored in Makefile'
1109         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1110          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1111          echo  ''
1112         @echo  'Static analysers'
1113         @echo  '  checkstack      - Generate a list of stack hogs'
1114         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1115         @echo  '  versioncheck    - Sanity check on version.h usage'
1116         @echo  '  includecheck    - Check for duplicate included header files'
1117         @echo  '  export_report   - List the usages of all exported symbols'
1118         @echo  '  headers_check   - Sanity check on exported headers'
1119         @echo  '  headerdep       - Detect inclusion cycles in headers'
1120         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1121         @echo  ''
1122         @echo  'Kernel packaging:'
1123         @$(MAKE) $(build)=$(package-dir) help
1124         @echo  ''
1125         @echo  'Documentation targets:'
1126         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1127         @echo  ''
1128         @echo  'Architecture specific targets ($(SRCARCH)):'
1129         @$(if $(archhelp),$(archhelp),\
1130                 echo '  No architecture specific help defined for $(SRCARCH)')
1131         @echo  ''
1132         @$(if $(boards), \
1133                 $(foreach b, $(boards), \
1134                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1135                 echo '')
1136         @$(if $(board-dirs), \
1137                 $(foreach b, $(board-dirs), \
1138                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1139                 printf "  %-16s - Show all of the above\\n" help-boards; \
1140                 echo '')
1141
1142         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1143         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1144         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1145         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1146         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1147         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1148         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1149         @echo  '                1: warnings which may be relevant and do not occur too often'
1150         @echo  '                2: warnings which occur quite often but may still be relevant'
1151         @echo  '                3: more obscure warnings, can most likely be ignored'
1152         @echo  '                Multiple levels can be combined with W=12 or W=123'
1153         @echo  ''
1154         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1155         @echo  'For further info see the ./README file'
1156
1157
1158 help-board-dirs := $(addprefix help-,$(board-dirs))
1159
1160 help-boards: $(help-board-dirs)
1161
1162 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1163
1164 $(help-board-dirs): help-%:
1165         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1166         @$(if $(boards-per-dir), \
1167                 $(foreach b, $(boards-per-dir), \
1168                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1169                 echo '')
1170
1171
1172 # Documentation targets
1173 # ---------------------------------------------------------------------------
1174 %docs: scripts_basic FORCE
1175         $(Q)$(MAKE) $(build)=scripts build_docproc
1176         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1177
1178 else # KBUILD_EXTMOD
1179
1180 ###
1181 # External module support.
1182 # When building external modules the kernel used as basis is considered
1183 # read-only, and no consistency checks are made and the make
1184 # system is not used on the basis kernel. If updates are required
1185 # in the basis kernel ordinary make commands (without M=...) must
1186 # be used.
1187 #
1188 # The following are the only valid targets when building external
1189 # modules.
1190 # make M=dir clean     Delete all automatically generated files
1191 # make M=dir modules   Make all modules in specified dir
1192 # make M=dir           Same as 'make M=dir modules'
1193 # make M=dir modules_install
1194 #                      Install the modules built in the module directory
1195 #                      Assumes install directory is already created
1196
1197 # We are always building modules
1198 KBUILD_MODULES := 1
1199 PHONY += crmodverdir
1200 crmodverdir:
1201         $(cmd_crmodverdir)
1202
1203 PHONY += $(objtree)/Module.symvers
1204 $(objtree)/Module.symvers:
1205         @test -e $(objtree)/Module.symvers || ( \
1206         echo; \
1207         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1208         echo "           is missing; modules will have no dependencies and modversions."; \
1209         echo )
1210
1211 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1212 PHONY += $(module-dirs) modules
1213 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1214         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1215
1216 modules: $(module-dirs)
1217         @$(kecho) '  Building modules, stage 2.';
1218         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1219
1220 PHONY += modules_install
1221 modules_install: _emodinst_ _emodinst_post
1222
1223 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1224 PHONY += _emodinst_
1225 _emodinst_:
1226         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1227         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1228
1229 PHONY += _emodinst_post
1230 _emodinst_post: _emodinst_
1231         $(call cmd,depmod)
1232
1233 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1234
1235 PHONY += $(clean-dirs) clean
1236 $(clean-dirs):
1237         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1238
1239 clean:  rm-dirs := $(MODVERDIR)
1240 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1241
1242 help:
1243         @echo  '  Building external modules.'
1244         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1245         @echo  ''
1246         @echo  '  modules         - default target, build the module(s)'
1247         @echo  '  modules_install - install the module'
1248         @echo  '  clean           - remove generated files in module directory only'
1249         @echo  ''
1250
1251 # Dummies...
1252 PHONY += prepare scripts
1253 prepare: ;
1254 scripts: ;
1255 endif # KBUILD_EXTMOD
1256
1257 clean: $(clean-dirs)
1258         $(call cmd,rmdirs)
1259         $(call cmd,rmfiles)
1260         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1261                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1262                 -o -name '*.ko.*' \
1263                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1264                 -o -name '*.symtypes' -o -name 'modules.order' \
1265                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1266                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1267
1268 # Generate tags for editors
1269 # ---------------------------------------------------------------------------
1270 quiet_cmd_tags = GEN     $@
1271       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1272
1273 tags TAGS cscope gtags: FORCE
1274         $(call cmd,tags)
1275
1276 # Scripts to check various things for consistency
1277 # ---------------------------------------------------------------------------
1278
1279 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1280
1281 includecheck:
1282         find $(srctree)/* $(RCS_FIND_IGNORE) \
1283                 -name '*.[hcS]' -type f -print | sort \
1284                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1285
1286 versioncheck:
1287         find $(srctree)/* $(RCS_FIND_IGNORE) \
1288                 -name '*.[hcS]' -type f -print | sort \
1289                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1290
1291 coccicheck:
1292         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1293
1294 namespacecheck:
1295         $(PERL) $(srctree)/scripts/namespace.pl
1296
1297 export_report:
1298         $(PERL) $(srctree)/scripts/export_report.pl
1299
1300 endif #ifeq ($(config-targets),1)
1301 endif #ifeq ($(mixed-targets),1)
1302
1303 PHONY += checkstack kernelrelease kernelversion
1304
1305 # UML needs a little special treatment here.  It wants to use the host
1306 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1307 # else wants $(ARCH), including people doing cross-builds, which means
1308 # that $(SUBARCH) doesn't work here.
1309 ifeq ($(ARCH), um)
1310 CHECKSTACK_ARCH := $(SUBARCH)
1311 else
1312 CHECKSTACK_ARCH := $(ARCH)
1313 endif
1314 checkstack:
1315         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1316         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1317
1318 kernelrelease:
1319         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1320
1321 kernelversion:
1322         @echo $(KERNELVERSION)
1323
1324 # Clear a bunch of variables before executing the submake
1325 tools/: FORCE
1326         $(Q)mkdir -p $(objtree)/tools
1327         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= O=$(objtree) subdir=tools -C $(src)/tools/
1328
1329 tools/%: FORCE
1330         $(Q)mkdir -p $(objtree)/tools
1331         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= O=$(objtree) subdir=tools -C $(src)/tools/ $*
1332
1333 # Single targets
1334 # ---------------------------------------------------------------------------
1335 # Single targets are compatible with:
1336 # - build with mixed source and output
1337 # - build with separate output dir 'make O=...'
1338 # - external modules
1339 #
1340 #  target-dir => where to store outputfile
1341 #  build-dir  => directory in kernel source tree to use
1342
1343 ifeq ($(KBUILD_EXTMOD),)
1344         build-dir  = $(patsubst %/,%,$(dir $@))
1345         target-dir = $(dir $@)
1346 else
1347         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1348         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1349         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1350 endif
1351
1352 %.s: %.c prepare scripts FORCE
1353         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1354 %.i: %.c prepare scripts FORCE
1355         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1356 %.o: %.c prepare scripts FORCE
1357         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1358 %.lst: %.c prepare scripts FORCE
1359         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1360 %.s: %.S prepare scripts FORCE
1361         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1362 %.o: %.S prepare scripts FORCE
1363         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1364 %.symtypes: %.c prepare scripts FORCE
1365         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1366
1367 # Modules
1368 /: prepare scripts FORCE
1369         $(cmd_crmodverdir)
1370         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1371         $(build)=$(build-dir)
1372 %/: prepare scripts FORCE
1373         $(cmd_crmodverdir)
1374         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1375         $(build)=$(build-dir)
1376 %.ko: prepare scripts FORCE
1377         $(cmd_crmodverdir)
1378         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1379         $(build)=$(build-dir) $(@:.ko=.o)
1380         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1381
1382 # FIXME Should go into a make.lib or something
1383 # ===========================================================================
1384
1385 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1386       cmd_rmdirs = rm -rf $(rm-dirs)
1387
1388 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1389       cmd_rmfiles = rm -f $(rm-files)
1390
1391 # Run depmod only if we have System.map and depmod is executable
1392 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1393       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1394                    $(KERNELRELEASE)
1395
1396 # Create temporary dir for module support files
1397 # clean it up only when building all modules
1398 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1399                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1400
1401 # read all saved command lines
1402
1403 targets := $(wildcard $(sort $(targets)))
1404 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1405
1406 ifneq ($(cmd_files),)
1407   $(cmd_files): ;       # Do not try to update included dependency files
1408   include $(cmd_files)
1409 endif
1410
1411 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1412 # Usage:
1413 # $(Q)$(MAKE) $(clean)=dir
1414 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1415
1416 endif   # skip-makefile
1417
1418 PHONY += FORCE
1419 FORCE:
1420
1421 # Declare the contents of the .PHONY variable as phony.  We keep that
1422 # information in a variable so we can use it in if_changed and friends.
1423 .PHONY: $(PHONY)