Makefile

   1 VERSION = 3
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 0
   4 EXTRAVERSION = -rc1
   5 NAME = Saber-toothed Squirrel
   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/ )
 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 $(CF)
 345 CFLAGS_MODULE   =
 346 AFLAGS_MODULE   =
 347 LDFLAGS_MODULE  =
 348 CFLAGS_KERNEL   =
 349 AFLAGS_KERNEL   =
 350 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 351
 352
 353 # Use LINUXINCLUDE when you must reference the include/ directory.
 354 # Needed to be compatible with the O= option
 355 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include \
 356                    -Iarch/$(hdr-arch)/include/generated -Iinclude \
 357                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 358                    -include $(srctree)/include/linux/kconfig.h
 359
 360 KBUILD_CPPFLAGS := -D__KERNEL__
 361
 362 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 363                    -fno-strict-aliasing -fno-common \
 364                    -Werror-implicit-function-declaration \
 365                    -Wno-format-security \
 366                    -fno-delete-null-pointer-checks
 367 KBUILD_AFLAGS_KERNEL :=
 368 KBUILD_CFLAGS_KERNEL :=
 369 KBUILD_AFLAGS   := -D__ASSEMBLY__
 370 KBUILD_AFLAGS_MODULE  := -DMODULE
 371 KBUILD_CFLAGS_MODULE  := -DMODULE
 372 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 373
 374 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 375 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 376 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 377
 378 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 379 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 380 export CPP AR NM STRIP OBJCOPY OBJDUMP
 381 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 382 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 383
 384 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 385 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 386 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 387 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 388 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 389 export KBUILD_ARFLAGS
 390
 391 # When compiling out-of-tree modules, put MODVERDIR in the module
 392 # tree rather than in the kernel tree. The kernel tree might
 393 # even be read-only.
 394 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 395
 396 # Files to ignore in find ... statements
 397
 398 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
 399                    -o -name .pc -o -name .hg -o -name .git \) -prune -o
 400 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 401                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 402
 403 # ===========================================================================
 404 # Rules shared between *config targets and build targets
 405
 406 # Basic helpers built in scripts/
 407 PHONY += scripts_basic
 408 scripts_basic:
 409         $(Q)$(MAKE) $(build)=scripts/basic
 410         $(Q)rm -f .tmp_quiet_recordmcount
 411
 412 # To avoid any implicit rule to kick in, define an empty command.
 413 scripts/basic/%: scripts_basic ;
 414
 415 PHONY += outputmakefile
 416 # outputmakefile generates a Makefile in the output directory, if using a
 417 # separate output directory. This allows convenient use of make in the
 418 # output directory.
 419 outputmakefile:
 420 ifneq ($(KBUILD_SRC),)
 421         $(Q)ln -fsn $(srctree) source
 422         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 423             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 424 endif
 425
 426 # Support for using generic headers in asm-generic
 427 PHONY += asm-generic
 428 asm-generic:
 429         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 430                     obj=arch/$(SRCARCH)/include/generated/asm
 431
 432 # To make sure we do not include .config for any of the *config targets
 433 # catch them early, and hand them over to scripts/kconfig/Makefile
 434 # It is allowed to specify more targets when calling make, including
 435 # mixing *config targets and build targets.
 436 # For example 'make oldconfig all'.
 437 # Detect when mixed targets is specified, and make a second invocation
 438 # of make so .config is not included in this case either (for *config).
 439
 440 no-dot-config-targets := clean mrproper distclean \
 441                          cscope gtags TAGS tags help %docs check% coccicheck \
 442                          include/linux/version.h headers_% archheaders archscripts \
 443                          kernelversion %src-pkg
 444
 445 config-targets := 0
 446 mixed-targets  := 0
 447 dot-config     := 1
 448
 449 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 450         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 451                 dot-config := 0
 452         endif
 453 endif
 454
 455 ifeq ($(KBUILD_EXTMOD),)
 456         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 457                 config-targets := 1
 458                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 459                         mixed-targets := 1
 460                 endif
 461         endif
 462 endif
 463
 464 ifeq ($(mixed-targets),1)
 465 # ===========================================================================
 466 # We're called with mixed targets (*config and build targets).
 467 # Handle them one by one.
 468
 469 %:: FORCE
 470         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 471
 472 else
 473 ifeq ($(config-targets),1)
 474 # ===========================================================================
 475 # *config targets only - make sure prerequisites are updated, and descend
 476 # in scripts/kconfig to make the *config target
 477
 478 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 479 # KBUILD_DEFCONFIG may point out an alternative default configuration
 480 # used for 'make defconfig'
 481 include $(srctree)/arch/$(SRCARCH)/Makefile
 482 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 483
 484 config: scripts_basic outputmakefile FORCE
 485         $(Q)mkdir -p include/linux include/config
 486         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 487
 488 %config: scripts_basic outputmakefile FORCE
 489         $(Q)mkdir -p include/linux include/config
 490         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 491
 492 else
 493 # ===========================================================================
 494 # Build targets only - this includes vmlinux, arch specific targets, clean
 495 # targets and others. In general all targets except *config targets.
 496
 497 ifeq ($(KBUILD_EXTMOD),)
 498 # Additional helpers built in scripts/
 499 # Carefully list dependencies so we do not try to build scripts twice
 500 # in parallel
 501 PHONY += scripts
 502 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 503         $(Q)$(MAKE) $(build)=$(@)
 504
 505 # Objects we will link into vmlinux / subdirs we need to visit
 506 init-y          := init/
 507 drivers-y       := drivers/ sound/ firmware/
 508 net-y           := net/
 509 libs-y          := lib/
 510 core-y          := usr/
 511 endif # KBUILD_EXTMOD
 512
 513 ifeq ($(dot-config),1)
 514 # Read in config
 515 -include include/config/auto.conf
 516
 517 ifeq ($(KBUILD_EXTMOD),)
 518 # Read in dependencies to all Kconfig* files, make sure to run
 519 # oldconfig if changes are detected.
 520 -include include/config/auto.conf.cmd
 521
 522 # To avoid any implicit rule to kick in, define an empty command
 523 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 524
 525 # If .config is newer than include/config/auto.conf, someone tinkered
 526 # with it and forgot to run make oldconfig.
 527 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 528 # we execute the config step to be sure to catch updated Kconfig files
 529 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 530         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 531 else
 532 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 533 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 534 PHONY += include/config/auto.conf
 535
 536 include/config/auto.conf:
 537         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 538         echo >&2;                                                       \
 539         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 540         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 541         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 542         echo >&2 ;                                                      \
 543         /bin/false)
 544
 545 endif # KBUILD_EXTMOD
 546
 547 else
 548 # Dummy target needed, because used as prerequisite
 549 include/config/auto.conf: ;
 550 endif # $(dot-config)
 551
 552 # The all: target is the default when no target is given on the
 553 # command line.
 554 # This allow a user to issue only 'make' to build a kernel including modules
 555 # Defaults to vmlinux, but the arch makefile usually adds further targets
 556 all: vmlinux
 557
 558 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 559 KBUILD_CFLAGS   += -Os
 560 else
 561 KBUILD_CFLAGS   += -O2
 562 endif
 563
 564 include $(srctree)/arch/$(SRCARCH)/Makefile
 565
 566 ifdef CONFIG_READABLE_ASM
 567 # Disable optimizations that make assembler listings hard to read.
 568 # reorder blocks reorders the control in the function
 569 # ipa clone creates specialized cloned functions
 570 # partial inlining inlines only parts of functions
 571 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 572                  $(call cc-option,-fno-ipa-cp-clone,) \
 573                  $(call cc-option,-fno-partial-inlining)
 574 endif
 575
 576 ifneq ($(CONFIG_FRAME_WARN),0)
 577 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 578 endif
 579
 580 # Force gcc to behave correct even for buggy distributions
 581 ifndef CONFIG_CC_STACKPROTECTOR
 582 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 583 endif
 584
 585 # This warning generated too much noise in a regular build.
 586 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 587 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 588
 589 ifdef CONFIG_FRAME_POINTER
 590 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 591 else
 592 # Some targets (ARM with Thumb2, for example), can't be built with frame
 593 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 594 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 595 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 596 # -fomit-frame-pointer with FUNCTION_TRACER.
 597 ifndef CONFIG_FUNCTION_TRACER
 598 KBUILD_CFLAGS   += -fomit-frame-pointer
 599 endif
 600 endif
 601
 602 ifdef CONFIG_DEBUG_INFO
 603 KBUILD_CFLAGS   += -g
 604 KBUILD_AFLAGS   += -gdwarf-2
 605 endif
 606
 607 ifdef CONFIG_DEBUG_INFO_REDUCED
 608 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 609 endif
 610
 611 ifdef CONFIG_FUNCTION_TRACER
 612 KBUILD_CFLAGS   += -pg
 613 ifdef CONFIG_DYNAMIC_FTRACE
 614         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 615                 BUILD_C_RECORDMCOUNT := y
 616                 export BUILD_C_RECORDMCOUNT
 617         endif
 618 endif
 619 endif
 620
 621 # We trigger additional mismatches with less inlining
 622 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 623 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 624 endif
 625
 626 # arch Makefile may override CC so keep this after arch Makefile is included
 627 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 628 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 629
 630 # warn about C99 declaration after statement
 631 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 632
 633 # disable pointer signed / unsigned warnings in gcc 4.0
 634 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 635
 636 # disable invalid "can't wrap" optimizations for signed / pointers
 637 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 638
 639 # conserve stack if available
 640 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 641
 642 # use the deterministic mode of AR if available
 643 KBUILD_ARFLAGS := $(call ar-option,D)
 644
 645 # check for 'asm goto'
 646 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 647         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 648 endif
 649
 650 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 651 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 652 KBUILD_AFLAGS += $(KAFLAGS)
 653 KBUILD_CFLAGS += $(KCFLAGS)
 654
 655 # Use --build-id when available.
 656 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 657                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 658 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 659 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 660
 661 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 662 LDFLAGS_vmlinux += $(call ld-option, -X,)
 663 endif
 664
 665 # Default kernel image to build when no specific target is given.
 666 # KBUILD_IMAGE may be overruled on the command line or
 667 # set in the environment
 668 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 669 # this default value
 670 export KBUILD_IMAGE ?= vmlinux
 671
 672 #
 673 # INSTALL_PATH specifies where to place the updated kernel and system map
 674 # images. Default is /boot, but you can set it to other values
 675 export  INSTALL_PATH ?= /boot
 676
 677 #
 678 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 679 # relocations required by build roots.  This is not defined in the
 680 # makefile but the argument can be passed to make if needed.
 681 #
 682
 683 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 684 export MODLIB
 685
 686 #
 687 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 688 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 689 #  the default option --strip-debug will be used.  Otherwise,
 690 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 691
 692 ifdef INSTALL_MOD_STRIP
 693 ifeq ($(INSTALL_MOD_STRIP),1)
 694 mod_strip_cmd = $(STRIP) --strip-debug
 695 else
 696 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 697 endif # INSTALL_MOD_STRIP=1
 698 else
 699 mod_strip_cmd = true
 700 endif # INSTALL_MOD_STRIP
 701 export mod_strip_cmd
 702
 703
 704 ifeq ($(KBUILD_EXTMOD),)
 705 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 706
 707 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 708                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 709                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 710
 711 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 712                      $(init-n) $(init-) \
 713                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 714                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 715
 716 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 717 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 718 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 719 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 720 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 721 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 722 libs-y          := $(libs-y1) $(libs-y2)
 723
 724 # Externally visible symbols (used by link-vmlinux.sh)
 725 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 726 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 727 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 728 export LDFLAGS_vmlinux
 729
 730 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 731
 732 # Final link of vmlinux
 733       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 734 quiet_cmd_link-vmlinux = LINK    $@
 735
 736 # Include targets which we want to
 737 # execute if the rest of the kernel build went well.
 738 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 739 ifdef CONFIG_HEADERS_CHECK
 740         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 741 endif
 742 ifdef CONFIG_SAMPLES
 743         $(Q)$(MAKE) $(build)=samples
 744 endif
 745 ifdef CONFIG_BUILD_DOCSRC
 746         $(Q)$(MAKE) $(build)=Documentation
 747 endif
 748         +$(call if_changed,link-vmlinux)
 749
 750 # The actual objects are generated when descending,
 751 # make sure no implicit rule kicks in
 752 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 753
 754 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 755 # Preset locale variables to speed up the build process. Limit locale
 756 # tweaks to this spot to avoid wrong language settings when running
 757 # make menuconfig etc.
 758 # Error messages still appears in the original language
 759
 760 PHONY += $(vmlinux-dirs)
 761 $(vmlinux-dirs): prepare scripts
 762         $(Q)$(MAKE) $(build)=$@
 763
 764 # Store (new) KERNELRELASE string in include/config/kernel.release
 765 include/config/kernel.release: include/config/auto.conf FORCE
 766         $(Q)rm -f $@
 767         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 768
 769
 770 # Things we need to do before we recursively start building the kernel
 771 # or the modules are listed in "prepare".
 772 # A multi level approach is used. prepareN is processed before prepareN-1.
 773 # archprepare is used in arch Makefiles and when processed asm symlink,
 774 # version.h and scripts_basic is processed / created.
 775
 776 # Listed in dependency order
 777 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 778
 779 # prepare3 is used to check if we are building in a separate output directory,
 780 # and if so do:
 781 # 1) Check that make has not been executed in the kernel src $(srctree)
 782 prepare3: include/config/kernel.release
 783 ifneq ($(KBUILD_SRC),)
 784         @$(kecho) '  Using $(srctree) as source for kernel'
 785         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 786                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 787                 echo >&2 "  in the '$(srctree)' directory.";\
 788                 /bin/false; \
 789         fi;
 790 endif
 791
 792 # prepare2 creates a makefile if using a separate output directory
 793 prepare2: prepare3 outputmakefile asm-generic
 794
 795 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 796                    include/config/auto.conf
 797         $(cmd_crmodverdir)
 798
 799 archprepare: archheaders archscripts prepare1 scripts_basic
 800
 801 prepare0: archprepare FORCE
 802         $(Q)$(MAKE) $(build)=.
 803
 804 # All the preparing..
 805 prepare: prepare0
 806
 807 # Generate some files
 808 # ---------------------------------------------------------------------------
 809
 810 # KERNELRELEASE can change from a few different places, meaning version.h
 811 # needs to be updated, so this check is forced on all builds
 812
 813 uts_len := 64
 814 define filechk_utsrelease.h
 815         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 816           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 817           exit 1;                                                         \
 818         fi;                                                               \
 819         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 820 endef
 821
 822 define filechk_version.h
 823         (echo \#define LINUX_VERSION_CODE $(shell                         \
 824         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 825         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 826 endef
 827
 828 include/linux/version.h: $(srctree)/Makefile FORCE
 829         $(call filechk,version.h)
 830
 831 include/generated/utsrelease.h: include/config/kernel.release FORCE
 832         $(call filechk,utsrelease.h)
 833
 834 PHONY += headerdep
 835 headerdep:
 836         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 837         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 838
 839 # ---------------------------------------------------------------------------
 840
 841 PHONY += depend dep
 842 depend dep:
 843         @echo '*** Warning: make $@ is unnecessary now.'
 844
 845 # ---------------------------------------------------------------------------
 846 # Firmware install
 847 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 848 export INSTALL_FW_PATH
 849
 850 PHONY += firmware_install
 851 firmware_install: FORCE
 852         @mkdir -p $(objtree)/firmware
 853         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 854
 855 # ---------------------------------------------------------------------------
 856 # Kernel headers
 857
 858 #Default location for installed headers
 859 export INSTALL_HDR_PATH = $(objtree)/usr
 860
 861 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 862
 863 # If we do an all arch process set dst to asm-$(hdr-arch)
 864 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 865
 866 PHONY += archheaders
 867 archheaders:
 868
 869 PHONY += archscripts
 870 archscripts:
 871
 872 PHONY += __headers
 873 __headers: include/linux/version.h scripts_basic asm-generic archheaders archscripts FORCE
 874         $(Q)$(MAKE) $(build)=scripts build_unifdef
 875
 876 PHONY += headers_install_all
 877 headers_install_all:
 878         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
 879
 880 PHONY += headers_install
 881 headers_install: __headers
 882         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
 883         $(error Headers not exportable for the $(SRCARCH) architecture))
 884         $(Q)$(MAKE) $(hdr-inst)=include
 885         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
 886
 887 PHONY += headers_check_all
 888 headers_check_all: headers_install_all
 889         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
 890
 891 PHONY += headers_check
 892 headers_check: headers_install
 893         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
 894         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
 895
 896 # ---------------------------------------------------------------------------
 897 # Modules
 898
 899 ifdef CONFIG_MODULES
 900
 901 # By default, build modules as well
 902
 903 all: modules
 904
 905 #       Build modules
 906 #
 907 #       A module can be listed more than once in obj-m resulting in
 908 #       duplicate lines in modules.order files.  Those are removed
 909 #       using awk while concatenating to the final file.
 910
 911 PHONY += modules
 912 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
 913         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
 914         @$(kecho) '  Building modules, stage 2.';
 915         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 916         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
 917
 918 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
 919         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
 920
 921 %/modules.builtin: include/config/auto.conf
 922         $(Q)$(MAKE) $(modbuiltin)=$*
 923
 924
 925 # Target to prepare building external modules
 926 PHONY += modules_prepare
 927 modules_prepare: prepare scripts
 928
 929 # Target to install modules
 930 PHONY += modules_install
 931 modules_install: _modinst_ _modinst_post
 932
 933 PHONY += _modinst_
 934 _modinst_:
 935         @rm -rf $(MODLIB)/kernel
 936         @rm -f $(MODLIB)/source
 937         @mkdir -p $(MODLIB)/kernel
 938         @ln -s $(srctree) $(MODLIB)/source
 939         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 940                 rm -f $(MODLIB)/build ; \
 941                 ln -s $(objtree) $(MODLIB)/build ; \
 942         fi
 943         @cp -f $(objtree)/modules.order $(MODLIB)/
 944         @cp -f $(objtree)/modules.builtin $(MODLIB)/
 945         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
 946
 947 # This depmod is only for convenience to give the initial
 948 # boot a modules.dep even before / is mounted read-write.  However the
 949 # boot script depmod is the master version.
 950 PHONY += _modinst_post
 951 _modinst_post: _modinst_
 952         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
 953         $(call cmd,depmod)
 954
 955 else # CONFIG_MODULES
 956
 957 # Modules not configured
 958 # ---------------------------------------------------------------------------
 959
 960 modules modules_install: FORCE
 961         @echo >&2
 962         @echo >&2 "The present kernel configuration has modules disabled."
 963         @echo >&2 "Type 'make config' and enable loadable module support."
 964         @echo >&2 "Then build a kernel with module support enabled."
 965         @echo >&2
 966         @exit 1
 967
 968 endif # CONFIG_MODULES
 969
 970 ###
 971 # Cleaning is done on three levels.
 972 # make clean     Delete most generated files
 973 #                Leave enough to build external modules
 974 # make mrproper  Delete the current configuration, and all generated files
 975 # make distclean Remove editor backup files, patch leftover files and the like
 976
 977 # Directories & files removed with 'make clean'
 978 CLEAN_DIRS  += $(MODVERDIR)
 979
 980 # Directories & files removed with 'make mrproper'
 981 MRPROPER_DIRS  += include/config usr/include include/generated          \
 982                   arch/*/include/generated
 983 MRPROPER_FILES += .config .config.old .version .old_version             \
 984                   include/linux/version.h                               \
 985                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
 986
 987 # clean - Delete most, but leave enough to build external modules
 988 #
 989 clean: rm-dirs  := $(CLEAN_DIRS)
 990 clean: rm-files := $(CLEAN_FILES)
 991 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
 992
 993 PHONY += $(clean-dirs) clean archclean
 994 $(clean-dirs):
 995         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 996
 997 clean: archclean
 998
 999 # mrproper - Delete all generated files, including .config
1000 #
1001 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1002 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1003 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1004
1005 PHONY += $(mrproper-dirs) mrproper archmrproper
1006 $(mrproper-dirs):
1007         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1008
1009 mrproper: clean archmrproper $(mrproper-dirs)
1010         $(call cmd,rmdirs)
1011         $(call cmd,rmfiles)
1012
1013 # distclean
1014 #
1015 PHONY += distclean
1016
1017 distclean: mrproper
1018         @find $(srctree) $(RCS_FIND_IGNORE) \
1019                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1020                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1021                 -o -name '.*.rej' \
1022                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1023                 -type f -print | xargs rm -f
1024
1025
1026 # Packaging of the kernel to various formats
1027 # ---------------------------------------------------------------------------
1028 # rpm target kept for backward compatibility
1029 package-dir     := $(srctree)/scripts/package
1030
1031 %src-pkg: FORCE
1032         $(Q)$(MAKE) $(build)=$(package-dir) $@
1033 %pkg: include/config/kernel.release FORCE
1034         $(Q)$(MAKE) $(build)=$(package-dir) $@
1035 rpm: include/config/kernel.release FORCE
1036         $(Q)$(MAKE) $(build)=$(package-dir) $@
1037
1038
1039 # Brief documentation of the typical targets used
1040 # ---------------------------------------------------------------------------
1041
1042 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1043 boards := $(notdir $(boards))
1044 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1045 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1046
1047 help:
1048         @echo  'Cleaning targets:'
1049         @echo  '  clean           - Remove most generated files but keep the config and'
1050         @echo  '                    enough build support to build external modules'
1051         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1052         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1053         @echo  ''
1054         @echo  'Configuration targets:'
1055         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1056         @echo  ''
1057         @echo  'Other generic targets:'
1058         @echo  '  all             - Build all targets marked with [*]'
1059         @echo  '* vmlinux         - Build the bare kernel'
1060         @echo  '* modules         - Build all modules'
1061         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1062         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1063         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1064         @echo  '  dir/            - Build all files in dir and below'
1065         @echo  '  dir/file.[oisS] - Build specified target only'
1066         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1067         @echo  '                    (requires a recent binutils and recent build (System.map))'
1068         @echo  '  dir/file.ko     - Build module including final link'
1069         @echo  '  modules_prepare - Set up for building external modules'
1070         @echo  '  tags/TAGS       - Generate tags file for editors'
1071         @echo  '  cscope          - Generate cscope index'
1072         @echo  '  gtags           - Generate GNU GLOBAL index'
1073         @echo  '  kernelrelease   - Output the release version string'
1074         @echo  '  kernelversion   - Output the version stored in Makefile'
1075         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1076          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1077          echo  ''
1078         @echo  'Static analysers'
1079         @echo  '  checkstack      - Generate a list of stack hogs'
1080         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1081         @echo  '  versioncheck    - Sanity check on version.h usage'
1082         @echo  '  includecheck    - Check for duplicate included header files'
1083         @echo  '  export_report   - List the usages of all exported symbols'
1084         @echo  '  headers_check   - Sanity check on exported headers'
1085         @echo  '  headerdep       - Detect inclusion cycles in headers'
1086         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1087         @echo  ''
1088         @echo  'Kernel packaging:'
1089         @$(MAKE) $(build)=$(package-dir) help
1090         @echo  ''
1091         @echo  'Documentation targets:'
1092         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1093         @echo  ''
1094         @echo  'Architecture specific targets ($(SRCARCH)):'
1095         @$(if $(archhelp),$(archhelp),\
1096                 echo '  No architecture specific help defined for $(SRCARCH)')
1097         @echo  ''
1098         @$(if $(boards), \
1099                 $(foreach b, $(boards), \
1100                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1101                 echo '')
1102         @$(if $(board-dirs), \
1103                 $(foreach b, $(board-dirs), \
1104                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1105                 printf "  %-16s - Show all of the above\\n" help-boards; \
1106                 echo '')
1107
1108         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1109         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1110         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1111         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1112         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1113         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1114         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1115         @echo  '                1: warnings which may be relevant and do not occur too often'
1116         @echo  '                2: warnings which occur quite often but may still be relevant'
1117         @echo  '                3: more obscure warnings, can most likely be ignored'
1118         @echo  '                Multiple levels can be combined with W=12 or W=123'
1119         @echo  ''
1120         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1121         @echo  'For further info see the ./README file'
1122
1123
1124 help-board-dirs := $(addprefix help-,$(board-dirs))
1125
1126 help-boards: $(help-board-dirs)
1127
1128 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1129
1130 $(help-board-dirs): help-%:
1131         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1132         @$(if $(boards-per-dir), \
1133                 $(foreach b, $(boards-per-dir), \
1134                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1135                 echo '')
1136
1137
1138 # Documentation targets
1139 # ---------------------------------------------------------------------------
1140 %docs: scripts_basic FORCE
1141         $(Q)$(MAKE) $(build)=scripts build_docproc
1142         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1143
1144 else # KBUILD_EXTMOD
1145
1146 ###
1147 # External module support.
1148 # When building external modules the kernel used as basis is considered
1149 # read-only, and no consistency checks are made and the make
1150 # system is not used on the basis kernel. If updates are required
1151 # in the basis kernel ordinary make commands (without M=...) must
1152 # be used.
1153 #
1154 # The following are the only valid targets when building external
1155 # modules.
1156 # make M=dir clean     Delete all automatically generated files
1157 # make M=dir modules   Make all modules in specified dir
1158 # make M=dir           Same as 'make M=dir modules'
1159 # make M=dir modules_install
1160 #                      Install the modules built in the module directory
1161 #                      Assumes install directory is already created
1162
1163 # We are always building modules
1164 KBUILD_MODULES := 1
1165 PHONY += crmodverdir
1166 crmodverdir:
1167         $(cmd_crmodverdir)
1168
1169 PHONY += $(objtree)/Module.symvers
1170 $(objtree)/Module.symvers:
1171         @test -e $(objtree)/Module.symvers || ( \
1172         echo; \
1173         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1174         echo "           is missing; modules will have no dependencies and modversions."; \
1175         echo )
1176
1177 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1178 PHONY += $(module-dirs) modules
1179 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1180         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1181
1182 modules: $(module-dirs)
1183         @$(kecho) '  Building modules, stage 2.';
1184         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1185
1186 PHONY += modules_install
1187 modules_install: _emodinst_ _emodinst_post
1188
1189 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1190 PHONY += _emodinst_
1191 _emodinst_:
1192         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1193         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1194
1195 PHONY += _emodinst_post
1196 _emodinst_post: _emodinst_
1197         $(call cmd,depmod)
1198
1199 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1200
1201 PHONY += $(clean-dirs) clean
1202 $(clean-dirs):
1203         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1204
1205 clean:  rm-dirs := $(MODVERDIR)
1206 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1207
1208 help:
1209         @echo  '  Building external modules.'
1210         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1211         @echo  ''
1212         @echo  '  modules         - default target, build the module(s)'
1213         @echo  '  modules_install - install the module'
1214         @echo  '  clean           - remove generated files in module directory only'
1215         @echo  ''
1216
1217 # Dummies...
1218 PHONY += prepare scripts
1219 prepare: ;
1220 scripts: ;
1221 endif # KBUILD_EXTMOD
1222
1223 clean: $(clean-dirs)
1224         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1225         $(call cmd,rmdirs)
1226         $(call cmd,rmfiles)
1227         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1228                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1229                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1230                 -o -name '*.symtypes' -o -name 'modules.order' \
1231                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1232                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1233
1234 # Generate tags for editors
1235 # ---------------------------------------------------------------------------
1236 quiet_cmd_tags = GEN     $@
1237       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1238
1239 tags TAGS cscope gtags: FORCE
1240         $(call cmd,tags)
1241
1242 # Scripts to check various things for consistency
1243 # ---------------------------------------------------------------------------
1244
1245 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1246
1247 includecheck:
1248         find $(srctree)/* $(RCS_FIND_IGNORE) \
1249                 -name '*.[hcS]' -type f -print | sort \
1250                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1251
1252 versioncheck:
1253         find $(srctree)/* $(RCS_FIND_IGNORE) \
1254                 -name '*.[hcS]' -type f -print | sort \
1255                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1256
1257 coccicheck:
1258         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1259
1260 namespacecheck:
1261         $(PERL) $(srctree)/scripts/namespace.pl
1262
1263 export_report:
1264         $(PERL) $(srctree)/scripts/export_report.pl
1265
1266 endif #ifeq ($(config-targets),1)
1267 endif #ifeq ($(mixed-targets),1)
1268
1269 PHONY += checkstack kernelrelease kernelversion
1270
1271 # UML needs a little special treatment here.  It wants to use the host
1272 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1273 # else wants $(ARCH), including people doing cross-builds, which means
1274 # that $(SUBARCH) doesn't work here.
1275 ifeq ($(ARCH), um)
1276 CHECKSTACK_ARCH := $(SUBARCH)
1277 else
1278 CHECKSTACK_ARCH := $(ARCH)
1279 endif
1280 checkstack:
1281         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1282         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1283
1284 kernelrelease:
1285         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1286
1287 kernelversion:
1288         @echo $(KERNELVERSION)
1289
1290 # Clear a bunch of variables before executing the submake
1291 tools/: FORCE
1292         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/
1293
1294 tools/%: FORCE
1295         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ $*
1296
1297 # Single targets
1298 # ---------------------------------------------------------------------------
1299 # Single targets are compatible with:
1300 # - build with mixed source and output
1301 # - build with separate output dir 'make O=...'
1302 # - external modules
1303 #
1304 #  target-dir => where to store outputfile
1305 #  build-dir  => directory in kernel source tree to use
1306
1307 ifeq ($(KBUILD_EXTMOD),)
1308         build-dir  = $(patsubst %/,%,$(dir $@))
1309         target-dir = $(dir $@)
1310 else
1311         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1312         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1313         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1314 endif
1315
1316 %.s: %.c prepare scripts FORCE
1317         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1318 %.i: %.c prepare scripts FORCE
1319         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1320 %.o: %.c prepare scripts FORCE
1321         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1322 %.lst: %.c prepare scripts FORCE
1323         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1324 %.s: %.S prepare scripts FORCE
1325         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1326 %.o: %.S prepare scripts FORCE
1327         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1328 %.symtypes: %.c prepare scripts FORCE
1329         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1330
1331 # Modules
1332 /: prepare scripts FORCE
1333         $(cmd_crmodverdir)
1334         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1335         $(build)=$(build-dir)
1336 %/: prepare scripts FORCE
1337         $(cmd_crmodverdir)
1338         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1339         $(build)=$(build-dir)
1340 %.ko: prepare scripts FORCE
1341         $(cmd_crmodverdir)
1342         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1343         $(build)=$(build-dir) $(@:.ko=.o)
1344         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1345
1346 # FIXME Should go into a make.lib or something
1347 # ===========================================================================
1348
1349 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1350       cmd_rmdirs = rm -rf $(rm-dirs)
1351
1352 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1353       cmd_rmfiles = rm -f $(rm-files)
1354
1355 # Run depmod only if we have System.map and depmod is executable
1356 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1357       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1358                    $(KERNELRELEASE)
1359
1360 # Create temporary dir for module support files
1361 # clean it up only when building all modules
1362 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1363                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1364
1365 # read all saved command lines
1366
1367 targets := $(wildcard $(sort $(targets)))
1368 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1369
1370 ifneq ($(cmd_files),)
1371   $(cmd_files): ;       # Do not try to update included dependency files
1372   include $(cmd_files)
1373 endif
1374
1375 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1376 # Usage:
1377 # $(Q)$(MAKE) $(clean)=dir
1378 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1379
1380 endif   # skip-makefile
1381
1382 PHONY += FORCE
1383 FORCE:
1384
1385 # Declare the contents of the .PHONY variable as phony.  We keep that
1386 # information in a variable so we can use it in if_changed and friends.
1387 .PHONY: $(PHONY)