Makefile

   1 VERSION = 3
   2 PATCHLEVEL = 4
   3 SUBLEVEL = 0
   4 EXTRAVERSION =
   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;                                                           \
 539         echo "  ERROR: Kernel configuration is invalid.";               \
 540         echo "         include/generated/autoconf.h or $@ are missing.";\
 541         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 542         echo;                                                           \
 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 ifdef CONFIG_READABLE_ASM
 565 # Disable optimizations that make assembler listings hard to read.
 566 # reorder blocks reorders the control in the function
 567 # ipa clone creates specialized cloned functions
 568 # partial inlining inlines only parts of functions
 569 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 570                  $(call cc-option,-fno-ipa-cp-clone,) \
 571                  $(call cc-option,-fno-partial-inlining)
 572 endif
 573
 574 include $(srctree)/arch/$(SRCARCH)/Makefile
 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 # But warn user when we do so
 652 warn-assign = \
 653 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 654
 655 ifneq ($(KCPPFLAGS),)
 656         $(call warn-assign,CPPFLAGS)
 657         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 658 endif
 659 ifneq ($(KAFLAGS),)
 660         $(call warn-assign,AFLAGS)
 661         KBUILD_AFLAGS += $(KAFLAGS)
 662 endif
 663 ifneq ($(KCFLAGS),)
 664         $(call warn-assign,CFLAGS)
 665         KBUILD_CFLAGS += $(KCFLAGS)
 666 endif
 667
 668 # Use --build-id when available.
 669 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 670                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 671 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 672 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 673
 674 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 675 LDFLAGS_vmlinux += $(call ld-option, -X,)
 676 endif
 677
 678 # Default kernel image to build when no specific target is given.
 679 # KBUILD_IMAGE may be overruled on the command line or
 680 # set in the environment
 681 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 682 # this default value
 683 export KBUILD_IMAGE ?= vmlinux
 684
 685 #
 686 # INSTALL_PATH specifies where to place the updated kernel and system map
 687 # images. Default is /boot, but you can set it to other values
 688 export  INSTALL_PATH ?= /boot
 689
 690 #
 691 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 692 # relocations required by build roots.  This is not defined in the
 693 # makefile but the argument can be passed to make if needed.
 694 #
 695
 696 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 697 export MODLIB
 698
 699 #
 700 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 701 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 702 #  the default option --strip-debug will be used.  Otherwise,
 703 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 704
 705 ifdef INSTALL_MOD_STRIP
 706 ifeq ($(INSTALL_MOD_STRIP),1)
 707 mod_strip_cmd = $(STRIP) --strip-debug
 708 else
 709 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 710 endif # INSTALL_MOD_STRIP=1
 711 else
 712 mod_strip_cmd = true
 713 endif # INSTALL_MOD_STRIP
 714 export mod_strip_cmd
 715
 716
 717 ifeq ($(KBUILD_EXTMOD),)
 718 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 719
 720 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 721                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 722                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 723
 724 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 725                      $(init-n) $(init-) \
 726                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 727                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 728
 729 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 730 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 731 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 732 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 733 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 734 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 735 libs-y          := $(libs-y1) $(libs-y2)
 736
 737 # Externally visible symbols (used by link-vmlinux.sh)
 738 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 739 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 740 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 741 export LDFLAGS_vmlinux
 742
 743 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 744
 745 # Final link of vmlinux
 746       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 747 quiet_cmd_link-vmlinux = LINK    $@
 748
 749 # Include targets which we want to
 750 # execute if the rest of the kernel build went well.
 751 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 752 ifdef CONFIG_HEADERS_CHECK
 753         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 754 endif
 755 ifdef CONFIG_SAMPLES
 756         $(Q)$(MAKE) $(build)=samples
 757 endif
 758 ifdef CONFIG_BUILD_DOCSRC
 759         $(Q)$(MAKE) $(build)=Documentation
 760 endif
 761         +$(call if_changed,link-vmlinux)
 762
 763 # The actual objects are generated when descending,
 764 # make sure no implicit rule kicks in
 765 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 766
 767 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 768 # Preset locale variables to speed up the build process. Limit locale
 769 # tweaks to this spot to avoid wrong language settings when running
 770 # make menuconfig etc.
 771 # Error messages still appears in the original language
 772
 773 PHONY += $(vmlinux-dirs)
 774 $(vmlinux-dirs): prepare scripts
 775         $(Q)$(MAKE) $(build)=$@
 776
 777 # Store (new) KERNELRELASE string in include/config/kernel.release
 778 include/config/kernel.release: include/config/auto.conf FORCE
 779         $(Q)rm -f $@
 780         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 781
 782
 783 # Things we need to do before we recursively start building the kernel
 784 # or the modules are listed in "prepare".
 785 # A multi level approach is used. prepareN is processed before prepareN-1.
 786 # archprepare is used in arch Makefiles and when processed asm symlink,
 787 # version.h and scripts_basic is processed / created.
 788
 789 # Listed in dependency order
 790 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 791
 792 # prepare3 is used to check if we are building in a separate output directory,
 793 # and if so do:
 794 # 1) Check that make has not been executed in the kernel src $(srctree)
 795 prepare3: include/config/kernel.release
 796 ifneq ($(KBUILD_SRC),)
 797         @$(kecho) '  Using $(srctree) as source for kernel'
 798         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 799                 echo "  $(srctree) is not clean, please run 'make mrproper'"; \
 800                 echo "  in the '$(srctree)' directory.";\
 801                 /bin/false; \
 802         fi;
 803 endif
 804
 805 # prepare2 creates a makefile if using a separate output directory
 806 prepare2: prepare3 outputmakefile asm-generic
 807
 808 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 809                    include/config/auto.conf
 810         $(cmd_crmodverdir)
 811
 812 archprepare: archheaders archscripts prepare1 scripts_basic
 813
 814 prepare0: archprepare FORCE
 815         $(Q)$(MAKE) $(build)=.
 816
 817 # All the preparing..
 818 prepare: prepare0
 819
 820 # Generate some files
 821 # ---------------------------------------------------------------------------
 822
 823 # KERNELRELEASE can change from a few different places, meaning version.h
 824 # needs to be updated, so this check is forced on all builds
 825
 826 uts_len := 64
 827 define filechk_utsrelease.h
 828         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 829           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 830           exit 1;                                                         \
 831         fi;                                                               \
 832         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 833 endef
 834
 835 define filechk_version.h
 836         (echo \#define LINUX_VERSION_CODE $(shell                         \
 837         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 838         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 839 endef
 840
 841 include/linux/version.h: $(srctree)/Makefile FORCE
 842         $(call filechk,version.h)
 843
 844 include/generated/utsrelease.h: include/config/kernel.release FORCE
 845         $(call filechk,utsrelease.h)
 846
 847 PHONY += headerdep
 848 headerdep:
 849         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 850         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 851
 852 # ---------------------------------------------------------------------------
 853
 854 PHONY += depend dep
 855 depend dep:
 856         @echo '*** Warning: make $@ is unnecessary now.'
 857
 858 # ---------------------------------------------------------------------------
 859 # Firmware install
 860 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 861 export INSTALL_FW_PATH
 862
 863 PHONY += firmware_install
 864 firmware_install: FORCE
 865         @mkdir -p $(objtree)/firmware
 866         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 867
 868 # ---------------------------------------------------------------------------
 869 # Kernel headers
 870
 871 #Default location for installed headers
 872 export INSTALL_HDR_PATH = $(objtree)/usr
 873
 874 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 875
 876 # If we do an all arch process set dst to asm-$(hdr-arch)
 877 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 878
 879 PHONY += archheaders
 880 archheaders:
 881
 882 PHONY += archscripts
 883 archscripts:
 884
 885 PHONY += __headers
 886 __headers: include/linux/version.h scripts_basic asm-generic archheaders archscripts FORCE
 887         $(Q)$(MAKE) $(build)=scripts build_unifdef
 888
 889 PHONY += headers_install_all
 890 headers_install_all:
 891         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
 892
 893 PHONY += headers_install
 894 headers_install: __headers
 895         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
 896         $(error Headers not exportable for the $(SRCARCH) architecture))
 897         $(Q)$(MAKE) $(hdr-inst)=include
 898         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
 899
 900 PHONY += headers_check_all
 901 headers_check_all: headers_install_all
 902         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
 903
 904 PHONY += headers_check
 905 headers_check: headers_install
 906         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
 907         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
 908
 909 # ---------------------------------------------------------------------------
 910 # Modules
 911
 912 ifdef CONFIG_MODULES
 913
 914 # By default, build modules as well
 915
 916 all: modules
 917
 918 #       Build modules
 919 #
 920 #       A module can be listed more than once in obj-m resulting in
 921 #       duplicate lines in modules.order files.  Those are removed
 922 #       using awk while concatenating to the final file.
 923
 924 PHONY += modules
 925 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
 926         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
 927         @$(kecho) '  Building modules, stage 2.';
 928         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 929         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
 930
 931 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
 932         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
 933
 934 %/modules.builtin: include/config/auto.conf
 935         $(Q)$(MAKE) $(modbuiltin)=$*
 936
 937
 938 # Target to prepare building external modules
 939 PHONY += modules_prepare
 940 modules_prepare: prepare scripts
 941
 942 # Target to install modules
 943 PHONY += modules_install
 944 modules_install: _modinst_ _modinst_post
 945
 946 PHONY += _modinst_
 947 _modinst_:
 948         @rm -rf $(MODLIB)/kernel
 949         @rm -f $(MODLIB)/source
 950         @mkdir -p $(MODLIB)/kernel
 951         @ln -s $(srctree) $(MODLIB)/source
 952         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 953                 rm -f $(MODLIB)/build ; \
 954                 ln -s $(objtree) $(MODLIB)/build ; \
 955         fi
 956         @cp -f $(objtree)/modules.order $(MODLIB)/
 957         @cp -f $(objtree)/modules.builtin $(MODLIB)/
 958         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
 959
 960 # This depmod is only for convenience to give the initial
 961 # boot a modules.dep even before / is mounted read-write.  However the
 962 # boot script depmod is the master version.
 963 PHONY += _modinst_post
 964 _modinst_post: _modinst_
 965         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
 966         $(call cmd,depmod)
 967
 968 else # CONFIG_MODULES
 969
 970 # Modules not configured
 971 # ---------------------------------------------------------------------------
 972
 973 modules modules_install: FORCE
 974         @echo
 975         @echo "The present kernel configuration has modules disabled."
 976         @echo "Type 'make config' and enable loadable module support."
 977         @echo "Then build a kernel with module support enabled."
 978         @echo
 979         @exit 1
 980
 981 endif # CONFIG_MODULES
 982
 983 ###
 984 # Cleaning is done on three levels.
 985 # make clean     Delete most generated files
 986 #                Leave enough to build external modules
 987 # make mrproper  Delete the current configuration, and all generated files
 988 # make distclean Remove editor backup files, patch leftover files and the like
 989
 990 # Directories & files removed with 'make clean'
 991 CLEAN_DIRS  += $(MODVERDIR)
 992
 993 # Directories & files removed with 'make mrproper'
 994 MRPROPER_DIRS  += include/config usr/include include/generated          \
 995                   arch/*/include/generated
 996 MRPROPER_FILES += .config .config.old .version .old_version             \
 997                   include/linux/version.h                               \
 998                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
 999
1000 # clean - Delete most, but leave enough to build external modules
1001 #
1002 clean: rm-dirs  := $(CLEAN_DIRS)
1003 clean: rm-files := $(CLEAN_FILES)
1004 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1005
1006 PHONY += $(clean-dirs) clean archclean
1007 $(clean-dirs):
1008         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1009
1010 clean: archclean
1011
1012 # mrproper - Delete all generated files, including .config
1013 #
1014 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1015 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1016 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1017
1018 PHONY += $(mrproper-dirs) mrproper archmrproper
1019 $(mrproper-dirs):
1020         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1021
1022 mrproper: clean archmrproper $(mrproper-dirs)
1023         $(call cmd,rmdirs)
1024         $(call cmd,rmfiles)
1025
1026 # distclean
1027 #
1028 PHONY += distclean
1029
1030 distclean: mrproper
1031         @find $(srctree) $(RCS_FIND_IGNORE) \
1032                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1033                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1034                 -o -name '.*.rej' \
1035                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1036                 -type f -print | xargs rm -f
1037
1038
1039 # Packaging of the kernel to various formats
1040 # ---------------------------------------------------------------------------
1041 # rpm target kept for backward compatibility
1042 package-dir     := $(srctree)/scripts/package
1043
1044 %src-pkg: FORCE
1045         $(Q)$(MAKE) $(build)=$(package-dir) $@
1046 %pkg: include/config/kernel.release FORCE
1047         $(Q)$(MAKE) $(build)=$(package-dir) $@
1048 rpm: include/config/kernel.release FORCE
1049         $(Q)$(MAKE) $(build)=$(package-dir) $@
1050
1051
1052 # Brief documentation of the typical targets used
1053 # ---------------------------------------------------------------------------
1054
1055 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1056 boards := $(notdir $(boards))
1057 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1058 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1059
1060 help:
1061         @echo  'Cleaning targets:'
1062         @echo  '  clean           - Remove most generated files but keep the config and'
1063         @echo  '                    enough build support to build external modules'
1064         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1065         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1066         @echo  ''
1067         @echo  'Configuration targets:'
1068         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1069         @echo  ''
1070         @echo  'Other generic targets:'
1071         @echo  '  all             - Build all targets marked with [*]'
1072         @echo  '* vmlinux         - Build the bare kernel'
1073         @echo  '* modules         - Build all modules'
1074         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1075         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1076         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1077         @echo  '  dir/            - Build all files in dir and below'
1078         @echo  '  dir/file.[oisS] - Build specified target only'
1079         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1080         @echo  '                    (requires a recent binutils and recent build (System.map))'
1081         @echo  '  dir/file.ko     - Build module including final link'
1082         @echo  '  modules_prepare - Set up for building external modules'
1083         @echo  '  tags/TAGS       - Generate tags file for editors'
1084         @echo  '  cscope          - Generate cscope index'
1085         @echo  '  gtags           - Generate GNU GLOBAL index'
1086         @echo  '  kernelrelease   - Output the release version string'
1087         @echo  '  kernelversion   - Output the version stored in Makefile'
1088         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1089          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1090          echo  ''
1091         @echo  'Static analysers'
1092         @echo  '  checkstack      - Generate a list of stack hogs'
1093         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1094         @echo  '  versioncheck    - Sanity check on version.h usage'
1095         @echo  '  includecheck    - Check for duplicate included header files'
1096         @echo  '  export_report   - List the usages of all exported symbols'
1097         @echo  '  headers_check   - Sanity check on exported headers'
1098         @echo  '  headerdep       - Detect inclusion cycles in headers'
1099         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1100         @echo  ''
1101         @echo  'Kernel packaging:'
1102         @$(MAKE) $(build)=$(package-dir) help
1103         @echo  ''
1104         @echo  'Documentation targets:'
1105         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1106         @echo  ''
1107         @echo  'Architecture specific targets ($(SRCARCH)):'
1108         @$(if $(archhelp),$(archhelp),\
1109                 echo '  No architecture specific help defined for $(SRCARCH)')
1110         @echo  ''
1111         @$(if $(boards), \
1112                 $(foreach b, $(boards), \
1113                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1114                 echo '')
1115         @$(if $(board-dirs), \
1116                 $(foreach b, $(board-dirs), \
1117                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1118                 printf "  %-16s - Show all of the above\\n" help-boards; \
1119                 echo '')
1120
1121         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1122         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1123         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1124         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1125         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1126         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1127         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1128         @echo  '                1: warnings which may be relevant and do not occur too often'
1129         @echo  '                2: warnings which occur quite often but may still be relevant'
1130         @echo  '                3: more obscure warnings, can most likely be ignored'
1131         @echo  '                Multiple levels can be combined with W=12 or W=123'
1132         @echo  ''
1133         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1134         @echo  'For further info see the ./README file'
1135
1136
1137 help-board-dirs := $(addprefix help-,$(board-dirs))
1138
1139 help-boards: $(help-board-dirs)
1140
1141 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1142
1143 $(help-board-dirs): help-%:
1144         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1145         @$(if $(boards-per-dir), \
1146                 $(foreach b, $(boards-per-dir), \
1147                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1148                 echo '')
1149
1150
1151 # Documentation targets
1152 # ---------------------------------------------------------------------------
1153 %docs: scripts_basic FORCE
1154         $(Q)$(MAKE) $(build)=scripts build_docproc
1155         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1156
1157 else # KBUILD_EXTMOD
1158
1159 ###
1160 # External module support.
1161 # When building external modules the kernel used as basis is considered
1162 # read-only, and no consistency checks are made and the make
1163 # system is not used on the basis kernel. If updates are required
1164 # in the basis kernel ordinary make commands (without M=...) must
1165 # be used.
1166 #
1167 # The following are the only valid targets when building external
1168 # modules.
1169 # make M=dir clean     Delete all automatically generated files
1170 # make M=dir modules   Make all modules in specified dir
1171 # make M=dir           Same as 'make M=dir modules'
1172 # make M=dir modules_install
1173 #                      Install the modules built in the module directory
1174 #                      Assumes install directory is already created
1175
1176 # We are always building modules
1177 KBUILD_MODULES := 1
1178 PHONY += crmodverdir
1179 crmodverdir:
1180         $(cmd_crmodverdir)
1181
1182 PHONY += $(objtree)/Module.symvers
1183 $(objtree)/Module.symvers:
1184         @test -e $(objtree)/Module.symvers || ( \
1185         echo; \
1186         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1187         echo "           is missing; modules will have no dependencies and modversions."; \
1188         echo )
1189
1190 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1191 PHONY += $(module-dirs) modules
1192 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1193         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1194
1195 modules: $(module-dirs)
1196         @$(kecho) '  Building modules, stage 2.';
1197         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1198
1199 PHONY += modules_install
1200 modules_install: _emodinst_ _emodinst_post
1201
1202 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1203 PHONY += _emodinst_
1204 _emodinst_:
1205         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1206         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1207
1208 PHONY += _emodinst_post
1209 _emodinst_post: _emodinst_
1210         $(call cmd,depmod)
1211
1212 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1213
1214 PHONY += $(clean-dirs) clean
1215 $(clean-dirs):
1216         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1217
1218 clean:  rm-dirs := $(MODVERDIR)
1219 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1220
1221 help:
1222         @echo  '  Building external modules.'
1223         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1224         @echo  ''
1225         @echo  '  modules         - default target, build the module(s)'
1226         @echo  '  modules_install - install the module'
1227         @echo  '  clean           - remove generated files in module directory only'
1228         @echo  ''
1229
1230 # Dummies...
1231 PHONY += prepare scripts
1232 prepare: ;
1233 scripts: ;
1234 endif # KBUILD_EXTMOD
1235
1236 clean: $(clean-dirs)
1237         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1238         $(call cmd,rmdirs)
1239         $(call cmd,rmfiles)
1240         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1241                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1242                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1243                 -o -name '*.symtypes' -o -name 'modules.order' \
1244                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1245                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1246
1247 # Generate tags for editors
1248 # ---------------------------------------------------------------------------
1249 quiet_cmd_tags = GEN     $@
1250       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1251
1252 tags TAGS cscope gtags: FORCE
1253         $(call cmd,tags)
1254
1255 # Scripts to check various things for consistency
1256 # ---------------------------------------------------------------------------
1257
1258 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1259
1260 includecheck:
1261         find $(srctree)/* $(RCS_FIND_IGNORE) \
1262                 -name '*.[hcS]' -type f -print | sort \
1263                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1264
1265 versioncheck:
1266         find $(srctree)/* $(RCS_FIND_IGNORE) \
1267                 -name '*.[hcS]' -type f -print | sort \
1268                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1269
1270 coccicheck:
1271         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1272
1273 namespacecheck:
1274         $(PERL) $(srctree)/scripts/namespace.pl
1275
1276 export_report:
1277         $(PERL) $(srctree)/scripts/export_report.pl
1278
1279 endif #ifeq ($(config-targets),1)
1280 endif #ifeq ($(mixed-targets),1)
1281
1282 PHONY += checkstack kernelrelease kernelversion
1283
1284 # UML needs a little special treatment here.  It wants to use the host
1285 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1286 # else wants $(ARCH), including people doing cross-builds, which means
1287 # that $(SUBARCH) doesn't work here.
1288 ifeq ($(ARCH), um)
1289 CHECKSTACK_ARCH := $(SUBARCH)
1290 else
1291 CHECKSTACK_ARCH := $(ARCH)
1292 endif
1293 checkstack:
1294         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1295         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1296
1297 kernelrelease:
1298         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1299
1300 kernelversion:
1301         @echo $(KERNELVERSION)
1302
1303 # Clear a bunch of variables before executing the submake
1304 tools/: FORCE
1305         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/
1306
1307 tools/%: FORCE
1308         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ $*
1309
1310 # Single targets
1311 # ---------------------------------------------------------------------------
1312 # Single targets are compatible with:
1313 # - build with mixed source and output
1314 # - build with separate output dir 'make O=...'
1315 # - external modules
1316 #
1317 #  target-dir => where to store outputfile
1318 #  build-dir  => directory in kernel source tree to use
1319
1320 ifeq ($(KBUILD_EXTMOD),)
1321         build-dir  = $(patsubst %/,%,$(dir $@))
1322         target-dir = $(dir $@)
1323 else
1324         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1325         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1326         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1327 endif
1328
1329 %.s: %.c prepare scripts FORCE
1330         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1331 %.i: %.c prepare scripts FORCE
1332         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1333 %.o: %.c prepare scripts FORCE
1334         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1335 %.lst: %.c prepare scripts FORCE
1336         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1337 %.s: %.S prepare scripts FORCE
1338         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1339 %.o: %.S prepare scripts FORCE
1340         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1341 %.symtypes: %.c prepare scripts FORCE
1342         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1343
1344 # Modules
1345 /: prepare scripts FORCE
1346         $(cmd_crmodverdir)
1347         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1348         $(build)=$(build-dir)
1349 %/: prepare scripts FORCE
1350         $(cmd_crmodverdir)
1351         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1352         $(build)=$(build-dir)
1353 %.ko: prepare scripts FORCE
1354         $(cmd_crmodverdir)
1355         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1356         $(build)=$(build-dir) $(@:.ko=.o)
1357         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1358
1359 # FIXME Should go into a make.lib or something
1360 # ===========================================================================
1361
1362 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1363       cmd_rmdirs = rm -rf $(rm-dirs)
1364
1365 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1366       cmd_rmfiles = rm -f $(rm-files)
1367
1368 # Run depmod only if we have System.map and depmod is executable
1369 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1370       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1371                    $(KERNELRELEASE)
1372
1373 # Create temporary dir for module support files
1374 # clean it up only when building all modules
1375 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1376                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1377
1378 # read all saved command lines
1379
1380 targets := $(wildcard $(sort $(targets)))
1381 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1382
1383 ifneq ($(cmd_files),)
1384   $(cmd_files): ;       # Do not try to update included dependency files
1385   include $(cmd_files)
1386 endif
1387
1388 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1389 # Usage:
1390 # $(Q)$(MAKE) $(clean)=dir
1391 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1392
1393 endif   # skip-makefile
1394
1395 PHONY += FORCE
1396 FORCE:
1397
1398 # Declare the contents of the .PHONY variable as phony.  We keep that
1399 # information in a variable so we can use it in if_changed and friends.
1400 .PHONY: $(PHONY)