Makefile

   1 VERSION = 3
   2 PATCHLEVEL = 12
   3 SUBLEVEL = 0
   4 EXTRAVERSION =
   5 NAME = One Giant Leap for Frogkind
   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 # Avoid interference with shell env settings
  26 unexport GREP_OPTIONS
  27
  28 # We are using a recursive build, so we need to do a little thinking
  29 # to get the ordering right.
  30 #
  31 # Most importantly: sub-Makefiles should only ever modify files in
  32 # their own directory. If in some directory we have a dependency on
  33 # a file in another dir (which doesn't happen often, but it's often
  34 # unavoidable when linking the built-in.o targets which finally
  35 # turn into vmlinux), we will call a sub make in that other dir, and
  36 # after that we are sure that everything which is in that other dir
  37 # is now up to date.
  38 #
  39 # The only cases where we need to modify files which have global
  40 # effects are thus separated out and done before the recursive
  41 # descending is started. They are now explicitly listed as the
  42 # prepare rule.
  43
  44 # To put more focus on warnings, be less verbose as default
  45 # Use 'make V=1' to see the full commands
  46
  47 ifeq ("$(origin V)", "command line")
  48   KBUILD_VERBOSE = $(V)
  49 endif
  50 ifndef KBUILD_VERBOSE
  51   KBUILD_VERBOSE = 0
  52 endif
  53
  54 # Call a source code checker (by default, "sparse") as part of the
  55 # C compilation.
  56 #
  57 # Use 'make C=1' to enable checking of only re-compiled files.
  58 # Use 'make C=2' to enable checking of *all* source files, regardless
  59 # of whether they are re-compiled or not.
  60 #
  61 # See the file "Documentation/sparse.txt" for more details, including
  62 # where to get the "sparse" utility.
  63
  64 ifeq ("$(origin C)", "command line")
  65   KBUILD_CHECKSRC = $(C)
  66 endif
  67 ifndef KBUILD_CHECKSRC
  68   KBUILD_CHECKSRC = 0
  69 endif
  70
  71 # Use make M=dir to specify directory of external module to build
  72 # Old syntax make ... SUBDIRS=$PWD is still supported
  73 # Setting the environment variable KBUILD_EXTMOD take precedence
  74 ifdef SUBDIRS
  75   KBUILD_EXTMOD ?= $(SUBDIRS)
  76 endif
  77
  78 ifeq ("$(origin M)", "command line")
  79   KBUILD_EXTMOD := $(M)
  80 endif
  81
  82 # kbuild supports saving output files in a separate directory.
  83 # To locate output files in a separate directory two syntaxes are supported.
  84 # In both cases the working directory must be the root of the kernel src.
  85 # 1) O=
  86 # Use "make O=dir/to/store/output/files/"
  87 #
  88 # 2) Set KBUILD_OUTPUT
  89 # Set the environment variable KBUILD_OUTPUT to point to the directory
  90 # where the output files shall be placed.
  91 # export KBUILD_OUTPUT=dir/to/store/output/files/
  92 # make
  93 #
  94 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  95 # variable.
  96
  97
  98 # KBUILD_SRC is set on invocation of make in OBJ directory
  99 # KBUILD_SRC is not intended to be used by the regular user (for now)
 100 ifeq ($(KBUILD_SRC),)
 101
 102 # OK, Make called in directory where kernel src resides
 103 # Do we want to locate output files in a separate directory?
 104 ifeq ("$(origin O)", "command line")
 105   KBUILD_OUTPUT := $(O)
 106 endif
 107
 108 ifeq ("$(origin W)", "command line")
 109   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 110 endif
 111
 112 # That's our default target when none is given on the command line
 113 PHONY := _all
 114 _all:
 115
 116 # Cancel implicit rules on top Makefile
 117 $(CURDIR)/Makefile Makefile: ;
 118
 119 ifneq ($(KBUILD_OUTPUT),)
 120 # Invoke a second make in the output directory, passing relevant variables
 121 # check that the output directory actually exists
 122 saved-output := $(KBUILD_OUTPUT)
 123 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 124 $(if $(KBUILD_OUTPUT),, \
 125      $(error output directory "$(saved-output)" does not exist))
 126
 127 PHONY += $(MAKECMDGOALS) sub-make
 128
 129 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 130         @:
 131
 132 sub-make: FORCE
 133         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 134         KBUILD_SRC=$(CURDIR) \
 135         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 136         $(filter-out _all sub-make,$(MAKECMDGOALS))
 137
 138 # Leave processing to above invocation of make
 139 skip-makefile := 1
 140 endif # ifneq ($(KBUILD_OUTPUT),)
 141 endif # ifeq ($(KBUILD_SRC),)
 142
 143 # We process the rest of the Makefile if this is the final invocation of make
 144 ifeq ($(skip-makefile),)
 145
 146 # If building an external module we do not care about the all: rule
 147 # but instead _all depend on modules
 148 PHONY += all
 149 ifeq ($(KBUILD_EXTMOD),)
 150 _all: all
 151 else
 152 _all: modules
 153 endif
 154
 155 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 156 objtree         := $(CURDIR)
 157 src             := $(srctree)
 158 obj             := $(objtree)
 159
 160 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 161
 162 export srctree objtree VPATH
 163
 164
 165 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 166 # first, and if a usermode build is happening, the "ARCH=um" on the command
 167 # line overrides the setting of ARCH below.  If a native build is happening,
 168 # then ARCH is assigned, getting whatever value it gets normally, and
 169 # SUBARCH is subsequently ignored.
 170
 171 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 172                                   -e s/sun4u/sparc64/ \
 173                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 174                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 175                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 176                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 177
 178 # Cross compiling and selecting different set of gcc/bin-utils
 179 # ---------------------------------------------------------------------------
 180 #
 181 # When performing cross compilation for other architectures ARCH shall be set
 182 # to the target architecture. (See arch/* for the possibilities).
 183 # ARCH can be set during invocation of make:
 184 # make ARCH=ia64
 185 # Another way is to have ARCH set in the environment.
 186 # The default ARCH is the host where make is executed.
 187
 188 # CROSS_COMPILE specify the prefix used for all executables used
 189 # during compilation. Only gcc and related bin-utils executables
 190 # are prefixed with $(CROSS_COMPILE).
 191 # CROSS_COMPILE can be set on the command line
 192 # make CROSS_COMPILE=ia64-linux-
 193 # Alternatively CROSS_COMPILE can be set in the environment.
 194 # A third alternative is to store a setting in .config so that plain
 195 # "make" in the configured kernel build directory always uses that.
 196 # Default value for CROSS_COMPILE is not to prefix executables
 197 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 198 ARCH            ?= $(SUBARCH)
 199 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 200
 201 # Architecture as present in compile.h
 202 UTS_MACHINE     := $(ARCH)
 203 SRCARCH         := $(ARCH)
 204
 205 # Additional ARCH settings for x86
 206 ifeq ($(ARCH),i386)
 207         SRCARCH := x86
 208 endif
 209 ifeq ($(ARCH),x86_64)
 210         SRCARCH := x86
 211 endif
 212
 213 # Additional ARCH settings for sparc
 214 ifeq ($(ARCH),sparc32)
 215        SRCARCH := sparc
 216 endif
 217 ifeq ($(ARCH),sparc64)
 218        SRCARCH := sparc
 219 endif
 220
 221 # Additional ARCH settings for sh
 222 ifeq ($(ARCH),sh64)
 223        SRCARCH := sh
 224 endif
 225
 226 # Additional ARCH settings for tile
 227 ifeq ($(ARCH),tilepro)
 228        SRCARCH := tile
 229 endif
 230 ifeq ($(ARCH),tilegx)
 231        SRCARCH := tile
 232 endif
 233
 234 # Where to locate arch specific headers
 235 hdr-arch  := $(SRCARCH)
 236
 237 KCONFIG_CONFIG  ?= .config
 238 export KCONFIG_CONFIG
 239
 240 # SHELL used by kbuild
 241 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 242           else if [ -x /bin/bash ]; then echo /bin/bash; \
 243           else echo sh; fi ; fi)
 244
 245 HOSTCC       = gcc
 246 HOSTCXX      = g++
 247 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 248 HOSTCXXFLAGS = -O2
 249
 250 # Decide whether to build built-in, modular, or both.
 251 # Normally, just do built-in.
 252
 253 KBUILD_MODULES :=
 254 KBUILD_BUILTIN := 1
 255
 256 #       If we have only "make modules", don't compile built-in objects.
 257 #       When we're building modules with modversions, we need to consider
 258 #       the built-in objects during the descend as well, in order to
 259 #       make sure the checksums are up to date before we record them.
 260
 261 ifeq ($(MAKECMDGOALS),modules)
 262   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 263 endif
 264
 265 #       If we have "make <whatever> modules", compile modules
 266 #       in addition to whatever we do anyway.
 267 #       Just "make" or "make all" shall build modules as well
 268
 269 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 270   KBUILD_MODULES := 1
 271 endif
 272
 273 ifeq ($(MAKECMDGOALS),)
 274   KBUILD_MODULES := 1
 275 endif
 276
 277 export KBUILD_MODULES KBUILD_BUILTIN
 278 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 279
 280 # Beautify output
 281 # ---------------------------------------------------------------------------
 282 #
 283 # Normally, we echo the whole command before executing it. By making
 284 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 285 # $(quiet) to choose other forms of output instead, e.g.
 286 #
 287 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 288 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 289 #
 290 # If $(quiet) is empty, the whole command will be printed.
 291 # If it is set to "quiet_", only the short version will be printed.
 292 # If it is set to "silent_", nothing will be printed at all, since
 293 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 294 #
 295 # A simple variant is to prefix commands with $(Q) - that's useful
 296 # for commands that shall be hidden in non-verbose mode.
 297 #
 298 #       $(Q)ln $@ :<
 299 #
 300 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 301 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 302
 303 ifeq ($(KBUILD_VERBOSE),1)
 304   quiet =
 305   Q =
 306 else
 307   quiet=quiet_
 308   Q = @
 309 endif
 310
 311 # If the user is running make -s (silent mode), suppress echoing of
 312 # commands
 313
 314 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 315   quiet=silent_
 316 endif
 317
 318 export quiet Q KBUILD_VERBOSE
 319
 320
 321 # Look for make include files relative to root of kernel src
 322 MAKEFLAGS += --include-dir=$(srctree)
 323
 324 # We need some generic definitions (do not try to remake the file).
 325 $(srctree)/scripts/Kbuild.include: ;
 326 include $(srctree)/scripts/Kbuild.include
 327
 328 # Make variables (CC, etc...)
 329
 330 AS              = $(CROSS_COMPILE)as
 331 LD              = $(CROSS_COMPILE)ld
 332 CC              = $(CROSS_COMPILE)gcc
 333 CPP             = $(CC) -E
 334 AR              = $(CROSS_COMPILE)ar
 335 NM              = $(CROSS_COMPILE)nm
 336 STRIP           = $(CROSS_COMPILE)strip
 337 OBJCOPY         = $(CROSS_COMPILE)objcopy
 338 OBJDUMP         = $(CROSS_COMPILE)objdump
 339 AWK             = awk
 340 GENKSYMS        = scripts/genksyms/genksyms
 341 INSTALLKERNEL  := installkernel
 342 DEPMOD          = /sbin/depmod
 343 PERL            = perl
 344 CHECK           = sparse
 345
 346 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 347                   -Wbitwise -Wno-return-void $(CF)
 348 CFLAGS_MODULE   =
 349 AFLAGS_MODULE   =
 350 LDFLAGS_MODULE  =
 351 CFLAGS_KERNEL   =
 352 AFLAGS_KERNEL   =
 353 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 354
 355
 356 # Use USERINCLUDE when you must reference the UAPI directories only.
 357 USERINCLUDE    := \
 358                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 359                 -Iarch/$(hdr-arch)/include/generated/uapi \
 360                 -I$(srctree)/include/uapi \
 361                 -Iinclude/generated/uapi \
 362                 -include $(srctree)/include/linux/kconfig.h
 363
 364 # Use LINUXINCLUDE when you must reference the include/ directory.
 365 # Needed to be compatible with the O= option
 366 LINUXINCLUDE    := \
 367                 -I$(srctree)/arch/$(hdr-arch)/include \
 368                 -Iarch/$(hdr-arch)/include/generated \
 369                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 370                 -Iinclude \
 371                 $(USERINCLUDE)
 372
 373 KBUILD_CPPFLAGS := -D__KERNEL__
 374
 375 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 376                    -fno-strict-aliasing -fno-common \
 377                    -Werror-implicit-function-declaration \
 378                    -Wno-format-security \
 379                    -fno-delete-null-pointer-checks
 380 KBUILD_AFLAGS_KERNEL :=
 381 KBUILD_CFLAGS_KERNEL :=
 382 KBUILD_AFLAGS   := -D__ASSEMBLY__
 383 KBUILD_AFLAGS_MODULE  := -DMODULE
 384 KBUILD_CFLAGS_MODULE  := -DMODULE
 385 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 386
 387 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 388 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 389 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 390
 391 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 392 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 393 export CPP AR NM STRIP OBJCOPY OBJDUMP
 394 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 395 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 396
 397 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 398 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 399 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 400 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 401 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 402 export KBUILD_ARFLAGS
 403
 404 # When compiling out-of-tree modules, put MODVERDIR in the module
 405 # tree rather than in the kernel tree. The kernel tree might
 406 # even be read-only.
 407 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 408
 409 # Files to ignore in find ... statements
 410
 411 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
 412                    -o -name .pc -o -name .hg -o -name .git \) -prune -o
 413 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 414                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 415
 416 # ===========================================================================
 417 # Rules shared between *config targets and build targets
 418
 419 # Basic helpers built in scripts/
 420 PHONY += scripts_basic
 421 scripts_basic:
 422         $(Q)$(MAKE) $(build)=scripts/basic
 423         $(Q)rm -f .tmp_quiet_recordmcount
 424
 425 # To avoid any implicit rule to kick in, define an empty command.
 426 scripts/basic/%: scripts_basic ;
 427
 428 PHONY += outputmakefile
 429 # outputmakefile generates a Makefile in the output directory, if using a
 430 # separate output directory. This allows convenient use of make in the
 431 # output directory.
 432 outputmakefile:
 433 ifneq ($(KBUILD_SRC),)
 434         $(Q)ln -fsn $(srctree) source
 435         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 436             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 437 endif
 438
 439 # Support for using generic headers in asm-generic
 440 PHONY += asm-generic
 441 asm-generic:
 442         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 443                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 444         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 445                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 446
 447 # To make sure we do not include .config for any of the *config targets
 448 # catch them early, and hand them over to scripts/kconfig/Makefile
 449 # It is allowed to specify more targets when calling make, including
 450 # mixing *config targets and build targets.
 451 # For example 'make oldconfig all'.
 452 # Detect when mixed targets is specified, and make a second invocation
 453 # of make so .config is not included in this case either (for *config).
 454
 455 version_h := include/generated/uapi/linux/version.h
 456
 457 no-dot-config-targets := clean mrproper distclean \
 458                          cscope gtags TAGS tags help %docs check% coccicheck \
 459                          $(version_h) headers_% archheaders archscripts \
 460                          kernelversion %src-pkg
 461
 462 config-targets := 0
 463 mixed-targets  := 0
 464 dot-config     := 1
 465
 466 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 467         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 468                 dot-config := 0
 469         endif
 470 endif
 471
 472 ifeq ($(KBUILD_EXTMOD),)
 473         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 474                 config-targets := 1
 475                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 476                         mixed-targets := 1
 477                 endif
 478         endif
 479 endif
 480
 481 ifeq ($(mixed-targets),1)
 482 # ===========================================================================
 483 # We're called with mixed targets (*config and build targets).
 484 # Handle them one by one.
 485
 486 %:: FORCE
 487         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 488
 489 else
 490 ifeq ($(config-targets),1)
 491 # ===========================================================================
 492 # *config targets only - make sure prerequisites are updated, and descend
 493 # in scripts/kconfig to make the *config target
 494
 495 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 496 # KBUILD_DEFCONFIG may point out an alternative default configuration
 497 # used for 'make defconfig'
 498 include $(srctree)/arch/$(SRCARCH)/Makefile
 499 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 500
 501 config: scripts_basic outputmakefile FORCE
 502         $(Q)mkdir -p include/linux include/config
 503         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 504
 505 %config: scripts_basic outputmakefile FORCE
 506         $(Q)mkdir -p include/linux include/config
 507         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 508
 509 else
 510 # ===========================================================================
 511 # Build targets only - this includes vmlinux, arch specific targets, clean
 512 # targets and others. In general all targets except *config targets.
 513
 514 ifeq ($(KBUILD_EXTMOD),)
 515 # Additional helpers built in scripts/
 516 # Carefully list dependencies so we do not try to build scripts twice
 517 # in parallel
 518 PHONY += scripts
 519 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 520          asm-generic
 521         $(Q)$(MAKE) $(build)=$(@)
 522
 523 # Objects we will link into vmlinux / subdirs we need to visit
 524 init-y          := init/
 525 drivers-y       := drivers/ sound/ firmware/
 526 net-y           := net/
 527 libs-y          := lib/
 528 core-y          := usr/
 529 endif # KBUILD_EXTMOD
 530
 531 ifeq ($(dot-config),1)
 532 # Read in config
 533 -include include/config/auto.conf
 534
 535 ifeq ($(KBUILD_EXTMOD),)
 536 # Read in dependencies to all Kconfig* files, make sure to run
 537 # oldconfig if changes are detected.
 538 -include include/config/auto.conf.cmd
 539
 540 # To avoid any implicit rule to kick in, define an empty command
 541 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 542
 543 # If .config is newer than include/config/auto.conf, someone tinkered
 544 # with it and forgot to run make oldconfig.
 545 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 546 # we execute the config step to be sure to catch updated Kconfig files
 547 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 548         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 549 else
 550 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 551 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 552 PHONY += include/config/auto.conf
 553
 554 include/config/auto.conf:
 555         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 556         echo >&2;                                                       \
 557         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 558         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 559         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 560         echo >&2 ;                                                      \
 561         /bin/false)
 562
 563 endif # KBUILD_EXTMOD
 564
 565 else
 566 # Dummy target needed, because used as prerequisite
 567 include/config/auto.conf: ;
 568 endif # $(dot-config)
 569
 570 # The all: target is the default when no target is given on the
 571 # command line.
 572 # This allow a user to issue only 'make' to build a kernel including modules
 573 # Defaults to vmlinux, but the arch makefile usually adds further targets
 574 all: vmlinux
 575
 576 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 577 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 578 else
 579 KBUILD_CFLAGS   += -O2
 580 endif
 581
 582 include $(srctree)/arch/$(SRCARCH)/Makefile
 583
 584 ifdef CONFIG_READABLE_ASM
 585 # Disable optimizations that make assembler listings hard to read.
 586 # reorder blocks reorders the control in the function
 587 # ipa clone creates specialized cloned functions
 588 # partial inlining inlines only parts of functions
 589 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 590                  $(call cc-option,-fno-ipa-cp-clone,) \
 591                  $(call cc-option,-fno-partial-inlining)
 592 endif
 593
 594 ifneq ($(CONFIG_FRAME_WARN),0)
 595 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 596 endif
 597
 598 # Force gcc to behave correct even for buggy distributions
 599 ifndef CONFIG_CC_STACKPROTECTOR
 600 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 601 endif
 602
 603 # This warning generated too much noise in a regular build.
 604 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 605 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 606
 607 ifdef CONFIG_FRAME_POINTER
 608 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 609 else
 610 # Some targets (ARM with Thumb2, for example), can't be built with frame
 611 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 612 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 613 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 614 # -fomit-frame-pointer with FUNCTION_TRACER.
 615 ifndef CONFIG_FUNCTION_TRACER
 616 KBUILD_CFLAGS   += -fomit-frame-pointer
 617 endif
 618 endif
 619
 620 ifdef CONFIG_DEBUG_INFO
 621 KBUILD_CFLAGS   += -g
 622 KBUILD_AFLAGS   += -gdwarf-2
 623 endif
 624
 625 ifdef CONFIG_DEBUG_INFO_REDUCED
 626 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 627                    $(call cc-option,-fno-var-tracking)
 628 endif
 629
 630 ifdef CONFIG_FUNCTION_TRACER
 631 ifdef CONFIG_HAVE_FENTRY
 632 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 633 endif
 634 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
 635 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 636 ifdef CONFIG_DYNAMIC_FTRACE
 637         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 638                 BUILD_C_RECORDMCOUNT := y
 639                 export BUILD_C_RECORDMCOUNT
 640         endif
 641 endif
 642 endif
 643
 644 # We trigger additional mismatches with less inlining
 645 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 646 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 647 endif
 648
 649 # arch Makefile may override CC so keep this after arch Makefile is included
 650 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 651 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 652
 653 # warn about C99 declaration after statement
 654 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 655
 656 # disable pointer signed / unsigned warnings in gcc 4.0
 657 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 658
 659 # disable invalid "can't wrap" optimizations for signed / pointers
 660 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 661
 662 # conserve stack if available
 663 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 664
 665 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 666 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 667
 668 # require functions to have arguments in prototypes, not empty 'int foo()'
 669 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 670
 671 # use the deterministic mode of AR if available
 672 KBUILD_ARFLAGS := $(call ar-option,D)
 673
 674 # check for 'asm goto'
 675 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 676         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 677 endif
 678
 679 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 680 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 681 KBUILD_AFLAGS += $(KAFLAGS)
 682 KBUILD_CFLAGS += $(KCFLAGS)
 683
 684 # Use --build-id when available.
 685 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 686                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 687 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 688 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 689
 690 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 691 LDFLAGS_vmlinux += $(call ld-option, -X,)
 692 endif
 693
 694 # Default kernel image to build when no specific target is given.
 695 # KBUILD_IMAGE may be overruled on the command line or
 696 # set in the environment
 697 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 698 # this default value
 699 export KBUILD_IMAGE ?= vmlinux
 700
 701 #
 702 # INSTALL_PATH specifies where to place the updated kernel and system map
 703 # images. Default is /boot, but you can set it to other values
 704 export  INSTALL_PATH ?= /boot
 705
 706 #
 707 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 708 # relocations required by build roots.  This is not defined in the
 709 # makefile but the argument can be passed to make if needed.
 710 #
 711
 712 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 713 export MODLIB
 714
 715 #
 716 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 717 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 718 #  the default option --strip-debug will be used.  Otherwise,
 719 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 720
 721 ifdef INSTALL_MOD_STRIP
 722 ifeq ($(INSTALL_MOD_STRIP),1)
 723 mod_strip_cmd = $(STRIP) --strip-debug
 724 else
 725 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 726 endif # INSTALL_MOD_STRIP=1
 727 else
 728 mod_strip_cmd = true
 729 endif # INSTALL_MOD_STRIP
 730 export mod_strip_cmd
 731
 732 # Select initial ramdisk compression format, default is gzip(1).
 733 # This shall be used by the dracut(8) tool while creating an initramfs image.
 734 #
 735 INITRD_COMPRESS=gzip
 736 ifeq ($(CONFIG_RD_BZIP2), y)
 737         INITRD_COMPRESS=bzip2
 738 else ifeq ($(CONFIG_RD_LZMA), y)
 739         INITRD_COMPRESS=lzma
 740 else ifeq ($(CONFIG_RD_XZ), y)
 741         INITRD_COMPRESS=xz
 742 else ifeq ($(CONFIG_RD_LZO), y)
 743         INITRD_COMPRESS=lzo
 744 else ifeq ($(CONFIG_RD_LZ4), y)
 745         INITRD_COMPRESS=lz4
 746 endif
 747 export INITRD_COMPRESS
 748
 749 ifdef CONFIG_MODULE_SIG_ALL
 750 MODSECKEY = ./signing_key.priv
 751 MODPUBKEY = ./signing_key.x509
 752 export MODPUBKEY
 753 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
 754 else
 755 mod_sign_cmd = true
 756 endif
 757 export mod_sign_cmd
 758
 759
 760 ifeq ($(KBUILD_EXTMOD),)
 761 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 762
 763 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 764                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 765                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 766
 767 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 768                      $(init-n) $(init-) \
 769                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 770                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 771
 772 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 773 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 774 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 775 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 776 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 777 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 778 libs-y          := $(libs-y1) $(libs-y2)
 779
 780 # Externally visible symbols (used by link-vmlinux.sh)
 781 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 782 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 783 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 784 export LDFLAGS_vmlinux
 785 # used by scripts/pacmage/Makefile
 786 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
 787
 788 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 789
 790 # Final link of vmlinux
 791       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 792 quiet_cmd_link-vmlinux = LINK    $@
 793
 794 # Include targets which we want to
 795 # execute if the rest of the kernel build went well.
 796 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 797 ifdef CONFIG_HEADERS_CHECK
 798         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 799 endif
 800 ifdef CONFIG_SAMPLES
 801         $(Q)$(MAKE) $(build)=samples
 802 endif
 803 ifdef CONFIG_BUILD_DOCSRC
 804         $(Q)$(MAKE) $(build)=Documentation
 805 endif
 806         +$(call if_changed,link-vmlinux)
 807
 808 # The actual objects are generated when descending,
 809 # make sure no implicit rule kicks in
 810 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 811
 812 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 813 # Preset locale variables to speed up the build process. Limit locale
 814 # tweaks to this spot to avoid wrong language settings when running
 815 # make menuconfig etc.
 816 # Error messages still appears in the original language
 817
 818 PHONY += $(vmlinux-dirs)
 819 $(vmlinux-dirs): prepare scripts
 820         $(Q)$(MAKE) $(build)=$@
 821
 822 define filechk_kernel.release
 823         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 824 endef
 825
 826 # Store (new) KERNELRELEASE string in include/config/kernel.release
 827 include/config/kernel.release: include/config/auto.conf FORCE
 828         $(call filechk,kernel.release)
 829
 830
 831 # Things we need to do before we recursively start building the kernel
 832 # or the modules are listed in "prepare".
 833 # A multi level approach is used. prepareN is processed before prepareN-1.
 834 # archprepare is used in arch Makefiles and when processed asm symlink,
 835 # version.h and scripts_basic is processed / created.
 836
 837 # Listed in dependency order
 838 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 839
 840 # prepare3 is used to check if we are building in a separate output directory,
 841 # and if so do:
 842 # 1) Check that make has not been executed in the kernel src $(srctree)
 843 prepare3: include/config/kernel.release
 844 ifneq ($(KBUILD_SRC),)
 845         @$(kecho) '  Using $(srctree) as source for kernel'
 846         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 847                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 848                 echo >&2 "  in the '$(srctree)' directory.";\
 849                 /bin/false; \
 850         fi;
 851 endif
 852
 853 # prepare2 creates a makefile if using a separate output directory
 854 prepare2: prepare3 outputmakefile asm-generic
 855
 856 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 857                    include/config/auto.conf
 858         $(cmd_crmodverdir)
 859
 860 archprepare: archheaders archscripts prepare1 scripts_basic
 861
 862 prepare0: archprepare FORCE
 863         $(Q)$(MAKE) $(build)=.
 864
 865 # All the preparing..
 866 prepare: prepare0
 867
 868 # Generate some files
 869 # ---------------------------------------------------------------------------
 870
 871 # KERNELRELEASE can change from a few different places, meaning version.h
 872 # needs to be updated, so this check is forced on all builds
 873
 874 uts_len := 64
 875 define filechk_utsrelease.h
 876         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 877           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 878           exit 1;                                                         \
 879         fi;                                                               \
 880         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 881 endef
 882
 883 define filechk_version.h
 884         (echo \#define LINUX_VERSION_CODE $(shell                         \
 885         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 886         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 887 endef
 888
 889 $(version_h): $(srctree)/Makefile FORCE
 890         $(call filechk,version.h)
 891
 892 include/generated/utsrelease.h: include/config/kernel.release FORCE
 893         $(call filechk,utsrelease.h)
 894
 895 PHONY += headerdep
 896 headerdep:
 897         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 898         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 899
 900 # ---------------------------------------------------------------------------
 901
 902 PHONY += depend dep
 903 depend dep:
 904         @echo '*** Warning: make $@ is unnecessary now.'
 905
 906 # ---------------------------------------------------------------------------
 907 # Firmware install
 908 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 909 export INSTALL_FW_PATH
 910
 911 PHONY += firmware_install
 912 firmware_install: FORCE
 913         @mkdir -p $(objtree)/firmware
 914         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 915
 916 # ---------------------------------------------------------------------------
 917 # Kernel headers
 918
 919 #Default location for installed headers
 920 export INSTALL_HDR_PATH = $(objtree)/usr
 921
 922 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 923
 924 # If we do an all arch process set dst to asm-$(hdr-arch)
 925 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 926
 927 PHONY += archheaders
 928 archheaders:
 929
 930 PHONY += archscripts
 931 archscripts:
 932
 933 PHONY += __headers
 934 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
 935         $(Q)$(MAKE) $(build)=scripts build_unifdef
 936
 937 PHONY += headers_install_all
 938 headers_install_all:
 939         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
 940
 941 PHONY += headers_install
 942 headers_install: __headers
 943         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
 944           $(error Headers not exportable for the $(SRCARCH) architecture))
 945         $(Q)$(MAKE) $(hdr-inst)=include/uapi
 946         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
 947
 948 PHONY += headers_check_all
 949 headers_check_all: headers_install_all
 950         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
 951
 952 PHONY += headers_check
 953 headers_check: headers_install
 954         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
 955         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
 956
 957 # ---------------------------------------------------------------------------
 958 # Modules
 959
 960 ifdef CONFIG_MODULES
 961
 962 # By default, build modules as well
 963
 964 all: modules
 965
 966 #       Build modules
 967 #
 968 #       A module can be listed more than once in obj-m resulting in
 969 #       duplicate lines in modules.order files.  Those are removed
 970 #       using awk while concatenating to the final file.
 971
 972 PHONY += modules
 973 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
 974         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
 975         @$(kecho) '  Building modules, stage 2.';
 976         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 977         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
 978
 979 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
 980         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
 981
 982 %/modules.builtin: include/config/auto.conf
 983         $(Q)$(MAKE) $(modbuiltin)=$*
 984
 985
 986 # Target to prepare building external modules
 987 PHONY += modules_prepare
 988 modules_prepare: prepare scripts
 989
 990 # Target to install modules
 991 PHONY += modules_install
 992 modules_install: _modinst_ _modinst_post
 993
 994 PHONY += _modinst_
 995 _modinst_:
 996         @rm -rf $(MODLIB)/kernel
 997         @rm -f $(MODLIB)/source
 998         @mkdir -p $(MODLIB)/kernel
 999         @ln -s $(srctree) $(MODLIB)/source
1000         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1001                 rm -f $(MODLIB)/build ; \
1002                 ln -s $(objtree) $(MODLIB)/build ; \
1003         fi
1004         @cp -f $(objtree)/modules.order $(MODLIB)/
1005         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1006         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1007
1008 # This depmod is only for convenience to give the initial
1009 # boot a modules.dep even before / is mounted read-write.  However the
1010 # boot script depmod is the master version.
1011 PHONY += _modinst_post
1012 _modinst_post: _modinst_
1013         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1014         $(call cmd,depmod)
1015
1016 ifeq ($(CONFIG_MODULE_SIG), y)
1017 PHONY += modules_sign
1018 modules_sign:
1019         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1020 endif
1021
1022 else # CONFIG_MODULES
1023
1024 # Modules not configured
1025 # ---------------------------------------------------------------------------
1026
1027 modules modules_install: FORCE
1028         @echo >&2
1029         @echo >&2 "The present kernel configuration has modules disabled."
1030         @echo >&2 "Type 'make config' and enable loadable module support."
1031         @echo >&2 "Then build a kernel with module support enabled."
1032         @echo >&2
1033         @exit 1
1034
1035 endif # CONFIG_MODULES
1036
1037 ###
1038 # Cleaning is done on three levels.
1039 # make clean     Delete most generated files
1040 #                Leave enough to build external modules
1041 # make mrproper  Delete the current configuration, and all generated files
1042 # make distclean Remove editor backup files, patch leftover files and the like
1043
1044 # Directories & files removed with 'make clean'
1045 CLEAN_DIRS  += $(MODVERDIR)
1046
1047 # Directories & files removed with 'make mrproper'
1048 MRPROPER_DIRS  += include/config usr/include include/generated          \
1049                   arch/*/include/generated
1050 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1051                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1052                   signing_key.priv signing_key.x509 x509.genkey         \
1053                   extra_certificates signing_key.x509.keyid             \
1054                   signing_key.x509.signer
1055
1056 # clean - Delete most, but leave enough to build external modules
1057 #
1058 clean: rm-dirs  := $(CLEAN_DIRS)
1059 clean: rm-files := $(CLEAN_FILES)
1060 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1061
1062 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1063 $(clean-dirs):
1064         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1065
1066 vmlinuxclean:
1067         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1068
1069 clean: archclean vmlinuxclean
1070
1071 # mrproper - Delete all generated files, including .config
1072 #
1073 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1074 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1075 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1076
1077 PHONY += $(mrproper-dirs) mrproper archmrproper
1078 $(mrproper-dirs):
1079         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1080
1081 mrproper: clean archmrproper $(mrproper-dirs)
1082         $(call cmd,rmdirs)
1083         $(call cmd,rmfiles)
1084
1085 # distclean
1086 #
1087 PHONY += distclean
1088
1089 distclean: mrproper
1090         @find $(srctree) $(RCS_FIND_IGNORE) \
1091                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1092                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1093                 -o -name '.*.rej' \
1094                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1095                 -type f -print | xargs rm -f
1096
1097
1098 # Packaging of the kernel to various formats
1099 # ---------------------------------------------------------------------------
1100 # rpm target kept for backward compatibility
1101 package-dir     := $(srctree)/scripts/package
1102
1103 %src-pkg: FORCE
1104         $(Q)$(MAKE) $(build)=$(package-dir) $@
1105 %pkg: include/config/kernel.release FORCE
1106         $(Q)$(MAKE) $(build)=$(package-dir) $@
1107 rpm: include/config/kernel.release FORCE
1108         $(Q)$(MAKE) $(build)=$(package-dir) $@
1109
1110
1111 # Brief documentation of the typical targets used
1112 # ---------------------------------------------------------------------------
1113
1114 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1115 boards := $(notdir $(boards))
1116 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1117 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1118
1119 help:
1120         @echo  'Cleaning targets:'
1121         @echo  '  clean           - Remove most generated files but keep the config and'
1122         @echo  '                    enough build support to build external modules'
1123         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1124         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1125         @echo  ''
1126         @echo  'Configuration targets:'
1127         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1128         @echo  ''
1129         @echo  'Other generic targets:'
1130         @echo  '  all             - Build all targets marked with [*]'
1131         @echo  '* vmlinux         - Build the bare kernel'
1132         @echo  '* modules         - Build all modules'
1133         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1134         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1135         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1136         @echo  '  dir/            - Build all files in dir and below'
1137         @echo  '  dir/file.[oisS] - Build specified target only'
1138         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1139         @echo  '                    (requires a recent binutils and recent build (System.map))'
1140         @echo  '  dir/file.ko     - Build module including final link'
1141         @echo  '  modules_prepare - Set up for building external modules'
1142         @echo  '  tags/TAGS       - Generate tags file for editors'
1143         @echo  '  cscope          - Generate cscope index'
1144         @echo  '  gtags           - Generate GNU GLOBAL index'
1145         @echo  '  kernelrelease   - Output the release version string'
1146         @echo  '  kernelversion   - Output the version stored in Makefile'
1147         @echo  '  image_name      - Output the image name'
1148         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1149          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1150          echo  ''
1151         @echo  'Static analysers'
1152         @echo  '  checkstack      - Generate a list of stack hogs'
1153         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1154         @echo  '  versioncheck    - Sanity check on version.h usage'
1155         @echo  '  includecheck    - Check for duplicate included header files'
1156         @echo  '  export_report   - List the usages of all exported symbols'
1157         @echo  '  headers_check   - Sanity check on exported headers'
1158         @echo  '  headerdep       - Detect inclusion cycles in headers'
1159         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1160         @echo  ''
1161         @echo  'Kernel packaging:'
1162         @$(MAKE) $(build)=$(package-dir) help
1163         @echo  ''
1164         @echo  'Documentation targets:'
1165         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1166         @echo  ''
1167         @echo  'Architecture specific targets ($(SRCARCH)):'
1168         @$(if $(archhelp),$(archhelp),\
1169                 echo '  No architecture specific help defined for $(SRCARCH)')
1170         @echo  ''
1171         @$(if $(boards), \
1172                 $(foreach b, $(boards), \
1173                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1174                 echo '')
1175         @$(if $(board-dirs), \
1176                 $(foreach b, $(board-dirs), \
1177                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1178                 printf "  %-16s - Show all of the above\\n" help-boards; \
1179                 echo '')
1180
1181         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1182         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1183         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1184         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1185         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1186         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1187         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1188         @echo  '                1: warnings which may be relevant and do not occur too often'
1189         @echo  '                2: warnings which occur quite often but may still be relevant'
1190         @echo  '                3: more obscure warnings, can most likely be ignored'
1191         @echo  '                Multiple levels can be combined with W=12 or W=123'
1192         @echo  ''
1193         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1194         @echo  'For further info see the ./README file'
1195
1196
1197 help-board-dirs := $(addprefix help-,$(board-dirs))
1198
1199 help-boards: $(help-board-dirs)
1200
1201 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1202
1203 $(help-board-dirs): help-%:
1204         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1205         @$(if $(boards-per-dir), \
1206                 $(foreach b, $(boards-per-dir), \
1207                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1208                 echo '')
1209
1210
1211 # Documentation targets
1212 # ---------------------------------------------------------------------------
1213 %docs: scripts_basic FORCE
1214         $(Q)$(MAKE) $(build)=scripts build_docproc
1215         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1216
1217 else # KBUILD_EXTMOD
1218
1219 ###
1220 # External module support.
1221 # When building external modules the kernel used as basis is considered
1222 # read-only, and no consistency checks are made and the make
1223 # system is not used on the basis kernel. If updates are required
1224 # in the basis kernel ordinary make commands (without M=...) must
1225 # be used.
1226 #
1227 # The following are the only valid targets when building external
1228 # modules.
1229 # make M=dir clean     Delete all automatically generated files
1230 # make M=dir modules   Make all modules in specified dir
1231 # make M=dir           Same as 'make M=dir modules'
1232 # make M=dir modules_install
1233 #                      Install the modules built in the module directory
1234 #                      Assumes install directory is already created
1235
1236 # We are always building modules
1237 KBUILD_MODULES := 1
1238 PHONY += crmodverdir
1239 crmodverdir:
1240         $(cmd_crmodverdir)
1241
1242 PHONY += $(objtree)/Module.symvers
1243 $(objtree)/Module.symvers:
1244         @test -e $(objtree)/Module.symvers || ( \
1245         echo; \
1246         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1247         echo "           is missing; modules will have no dependencies and modversions."; \
1248         echo )
1249
1250 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1251 PHONY += $(module-dirs) modules
1252 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1253         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1254
1255 modules: $(module-dirs)
1256         @$(kecho) '  Building modules, stage 2.';
1257         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1258
1259 PHONY += modules_install
1260 modules_install: _emodinst_ _emodinst_post
1261
1262 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1263 PHONY += _emodinst_
1264 _emodinst_:
1265         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1266         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1267
1268 PHONY += _emodinst_post
1269 _emodinst_post: _emodinst_
1270         $(call cmd,depmod)
1271
1272 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1273
1274 PHONY += $(clean-dirs) clean
1275 $(clean-dirs):
1276         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1277
1278 clean:  rm-dirs := $(MODVERDIR)
1279 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1280
1281 help:
1282         @echo  '  Building external modules.'
1283         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1284         @echo  ''
1285         @echo  '  modules         - default target, build the module(s)'
1286         @echo  '  modules_install - install the module'
1287         @echo  '  clean           - remove generated files in module directory only'
1288         @echo  ''
1289
1290 # Dummies...
1291 PHONY += prepare scripts
1292 prepare: ;
1293 scripts: ;
1294 endif # KBUILD_EXTMOD
1295
1296 clean: $(clean-dirs)
1297         $(call cmd,rmdirs)
1298         $(call cmd,rmfiles)
1299         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1300                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1301                 -o -name '*.ko.*' \
1302                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1303                 -o -name '*.symtypes' -o -name 'modules.order' \
1304                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1305                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1306
1307 # Generate tags for editors
1308 # ---------------------------------------------------------------------------
1309 quiet_cmd_tags = GEN     $@
1310       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1311
1312 tags TAGS cscope gtags: FORCE
1313         $(call cmd,tags)
1314
1315 # Scripts to check various things for consistency
1316 # ---------------------------------------------------------------------------
1317
1318 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1319
1320 includecheck:
1321         find $(srctree)/* $(RCS_FIND_IGNORE) \
1322                 -name '*.[hcS]' -type f -print | sort \
1323                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1324
1325 versioncheck:
1326         find $(srctree)/* $(RCS_FIND_IGNORE) \
1327                 -name '*.[hcS]' -type f -print | sort \
1328                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1329
1330 coccicheck:
1331         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1332
1333 namespacecheck:
1334         $(PERL) $(srctree)/scripts/namespace.pl
1335
1336 export_report:
1337         $(PERL) $(srctree)/scripts/export_report.pl
1338
1339 endif #ifeq ($(config-targets),1)
1340 endif #ifeq ($(mixed-targets),1)
1341
1342 PHONY += checkstack kernelrelease kernelversion image_name
1343
1344 # UML needs a little special treatment here.  It wants to use the host
1345 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1346 # else wants $(ARCH), including people doing cross-builds, which means
1347 # that $(SUBARCH) doesn't work here.
1348 ifeq ($(ARCH), um)
1349 CHECKSTACK_ARCH := $(SUBARCH)
1350 else
1351 CHECKSTACK_ARCH := $(ARCH)
1352 endif
1353 checkstack:
1354         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1355         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1356
1357 kernelrelease:
1358         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1359
1360 kernelversion:
1361         @echo $(KERNELVERSION)
1362
1363 image_name:
1364         @echo $(KBUILD_IMAGE)
1365
1366 # Clear a bunch of variables before executing the submake
1367 tools/: FORCE
1368         $(Q)mkdir -p $(objtree)/tools
1369         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1370
1371 tools/%: FORCE
1372         $(Q)mkdir -p $(objtree)/tools
1373         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1374
1375 # Single targets
1376 # ---------------------------------------------------------------------------
1377 # Single targets are compatible with:
1378 # - build with mixed source and output
1379 # - build with separate output dir 'make O=...'
1380 # - external modules
1381 #
1382 #  target-dir => where to store outputfile
1383 #  build-dir  => directory in kernel source tree to use
1384
1385 ifeq ($(KBUILD_EXTMOD),)
1386         build-dir  = $(patsubst %/,%,$(dir $@))
1387         target-dir = $(dir $@)
1388 else
1389         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1390         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1391         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1392 endif
1393
1394 %.s: %.c prepare scripts FORCE
1395         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1396 %.i: %.c prepare scripts FORCE
1397         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1398 %.o: %.c prepare scripts FORCE
1399         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1400 %.lst: %.c prepare scripts FORCE
1401         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1402 %.s: %.S prepare scripts FORCE
1403         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1404 %.o: %.S prepare scripts FORCE
1405         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1406 %.symtypes: %.c prepare scripts FORCE
1407         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1408
1409 # Modules
1410 /: prepare scripts FORCE
1411         $(cmd_crmodverdir)
1412         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1413         $(build)=$(build-dir)
1414 %/: prepare scripts FORCE
1415         $(cmd_crmodverdir)
1416         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1417         $(build)=$(build-dir)
1418 %.ko: prepare scripts FORCE
1419         $(cmd_crmodverdir)
1420         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1421         $(build)=$(build-dir) $(@:.ko=.o)
1422         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1423
1424 # FIXME Should go into a make.lib or something
1425 # ===========================================================================
1426
1427 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1428       cmd_rmdirs = rm -rf $(rm-dirs)
1429
1430 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1431       cmd_rmfiles = rm -f $(rm-files)
1432
1433 # Run depmod only if we have System.map and depmod is executable
1434 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1435       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1436                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1437
1438 # Create temporary dir for module support files
1439 # clean it up only when building all modules
1440 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1441                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1442
1443 # read all saved command lines
1444
1445 targets := $(wildcard $(sort $(targets)))
1446 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1447
1448 ifneq ($(cmd_files),)
1449   $(cmd_files): ;       # Do not try to update included dependency files
1450   include $(cmd_files)
1451 endif
1452
1453 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1454 # Usage:
1455 # $(Q)$(MAKE) $(clean)=dir
1456 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1457
1458 endif   # skip-makefile
1459
1460 PHONY += FORCE
1461 FORCE:
1462
1463 # Declare the contents of the .PHONY variable as phony.  We keep that
1464 # information in a variable so we can use it in if_changed and friends.
1465 .PHONY: $(PHONY)