Makefile

   1 VERSION = 3
   2 PATCHLEVEL = 13
   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 # Handle stack protector mode.
 599 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 600   stackp-flag := -fstack-protector
 601   ifeq ($(call cc-option, $(stackp-flag)),)
 602     $(warning Cannot use CONFIG_CC_STACKPROTECTOR: \
 603               -fstack-protector not supported by compiler))
 604   endif
 605 else ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 606   stackp-flag := -fstack-protector-strong
 607   ifeq ($(call cc-option, $(stackp-flag)),)
 608     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 609               -fstack-protector-strong not supported by compiler)
 610   endif
 611 else
 612   # Force off for distro compilers that enable stack protector by default.
 613   stackp-flag := $(call cc-option, -fno-stack-protector)
 614 endif
 615 KBUILD_CFLAGS += $(stackp-flag)
 616
 617 # This warning generated too much noise in a regular build.
 618 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 619 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 620
 621 ifdef CONFIG_FRAME_POINTER
 622 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 623 else
 624 # Some targets (ARM with Thumb2, for example), can't be built with frame
 625 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 626 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 627 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 628 # -fomit-frame-pointer with FUNCTION_TRACER.
 629 ifndef CONFIG_FUNCTION_TRACER
 630 KBUILD_CFLAGS   += -fomit-frame-pointer
 631 endif
 632 endif
 633
 634 ifdef CONFIG_DEBUG_INFO
 635 KBUILD_CFLAGS   += -g
 636 KBUILD_AFLAGS   += -gdwarf-2
 637 endif
 638
 639 ifdef CONFIG_DEBUG_INFO_REDUCED
 640 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 641                    $(call cc-option,-fno-var-tracking)
 642 endif
 643
 644 ifdef CONFIG_FUNCTION_TRACER
 645 ifdef CONFIG_HAVE_FENTRY
 646 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 647 endif
 648 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
 649 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 650 ifdef CONFIG_DYNAMIC_FTRACE
 651         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 652                 BUILD_C_RECORDMCOUNT := y
 653                 export BUILD_C_RECORDMCOUNT
 654         endif
 655 endif
 656 endif
 657
 658 # We trigger additional mismatches with less inlining
 659 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 660 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 661 endif
 662
 663 # arch Makefile may override CC so keep this after arch Makefile is included
 664 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 665 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 666
 667 # warn about C99 declaration after statement
 668 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 669
 670 # disable pointer signed / unsigned warnings in gcc 4.0
 671 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 672
 673 # disable invalid "can't wrap" optimizations for signed / pointers
 674 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 675
 676 # conserve stack if available
 677 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 678
 679 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 680 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 681
 682 # require functions to have arguments in prototypes, not empty 'int foo()'
 683 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 684
 685 # use the deterministic mode of AR if available
 686 KBUILD_ARFLAGS := $(call ar-option,D)
 687
 688 # check for 'asm goto'
 689 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 690         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 691 endif
 692
 693 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 694 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 695 KBUILD_AFLAGS += $(KAFLAGS)
 696 KBUILD_CFLAGS += $(KCFLAGS)
 697
 698 # Use --build-id when available.
 699 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 700                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 701 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 702 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 703
 704 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 705 LDFLAGS_vmlinux += $(call ld-option, -X,)
 706 endif
 707
 708 # Default kernel image to build when no specific target is given.
 709 # KBUILD_IMAGE may be overruled on the command line or
 710 # set in the environment
 711 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 712 # this default value
 713 export KBUILD_IMAGE ?= vmlinux
 714
 715 #
 716 # INSTALL_PATH specifies where to place the updated kernel and system map
 717 # images. Default is /boot, but you can set it to other values
 718 export  INSTALL_PATH ?= /boot
 719
 720 #
 721 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 722 # relocations required by build roots.  This is not defined in the
 723 # makefile but the argument can be passed to make if needed.
 724 #
 725
 726 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 727 export MODLIB
 728
 729 #
 730 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 731 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 732 #  the default option --strip-debug will be used.  Otherwise,
 733 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 734
 735 ifdef INSTALL_MOD_STRIP
 736 ifeq ($(INSTALL_MOD_STRIP),1)
 737 mod_strip_cmd = $(STRIP) --strip-debug
 738 else
 739 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 740 endif # INSTALL_MOD_STRIP=1
 741 else
 742 mod_strip_cmd = true
 743 endif # INSTALL_MOD_STRIP
 744 export mod_strip_cmd
 745
 746 # Select initial ramdisk compression format, default is gzip(1).
 747 # This shall be used by the dracut(8) tool while creating an initramfs image.
 748 #
 749 INITRD_COMPRESS-y                  := gzip
 750 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 751 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 752 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 753 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 754 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 755 # do not export INITRD_COMPRESS, since we didn't actually
 756 # choose a sane default compression above.
 757 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 758
 759 ifdef CONFIG_MODULE_SIG_ALL
 760 MODSECKEY = ./signing_key.priv
 761 MODPUBKEY = ./signing_key.x509
 762 export MODPUBKEY
 763 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
 764 else
 765 mod_sign_cmd = true
 766 endif
 767 export mod_sign_cmd
 768
 769
 770 ifeq ($(KBUILD_EXTMOD),)
 771 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 772
 773 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 774                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 775                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 776
 777 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 778                      $(init-n) $(init-) \
 779                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 780                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 781
 782 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 783 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 784 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 785 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 786 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 787 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 788 libs-y          := $(libs-y1) $(libs-y2)
 789
 790 # Externally visible symbols (used by link-vmlinux.sh)
 791 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 792 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 793 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 794 export LDFLAGS_vmlinux
 795 # used by scripts/pacmage/Makefile
 796 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
 797
 798 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 799
 800 # Final link of vmlinux
 801       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 802 quiet_cmd_link-vmlinux = LINK    $@
 803
 804 # Include targets which we want to
 805 # execute if the rest of the kernel build went well.
 806 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 807 ifdef CONFIG_HEADERS_CHECK
 808         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 809 endif
 810 ifdef CONFIG_SAMPLES
 811         $(Q)$(MAKE) $(build)=samples
 812 endif
 813 ifdef CONFIG_BUILD_DOCSRC
 814         $(Q)$(MAKE) $(build)=Documentation
 815 endif
 816         +$(call if_changed,link-vmlinux)
 817
 818 # The actual objects are generated when descending,
 819 # make sure no implicit rule kicks in
 820 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 821
 822 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 823 # Preset locale variables to speed up the build process. Limit locale
 824 # tweaks to this spot to avoid wrong language settings when running
 825 # make menuconfig etc.
 826 # Error messages still appears in the original language
 827
 828 PHONY += $(vmlinux-dirs)
 829 $(vmlinux-dirs): prepare scripts
 830         $(Q)$(MAKE) $(build)=$@
 831
 832 define filechk_kernel.release
 833         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 834 endef
 835
 836 # Store (new) KERNELRELEASE string in include/config/kernel.release
 837 include/config/kernel.release: include/config/auto.conf FORCE
 838         $(call filechk,kernel.release)
 839
 840
 841 # Things we need to do before we recursively start building the kernel
 842 # or the modules are listed in "prepare".
 843 # A multi level approach is used. prepareN is processed before prepareN-1.
 844 # archprepare is used in arch Makefiles and when processed asm symlink,
 845 # version.h and scripts_basic is processed / created.
 846
 847 # Listed in dependency order
 848 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 849
 850 # prepare3 is used to check if we are building in a separate output directory,
 851 # and if so do:
 852 # 1) Check that make has not been executed in the kernel src $(srctree)
 853 prepare3: include/config/kernel.release
 854 ifneq ($(KBUILD_SRC),)
 855         @$(kecho) '  Using $(srctree) as source for kernel'
 856         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 857                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 858                 echo >&2 "  in the '$(srctree)' directory.";\
 859                 /bin/false; \
 860         fi;
 861 endif
 862
 863 # prepare2 creates a makefile if using a separate output directory
 864 prepare2: prepare3 outputmakefile asm-generic
 865
 866 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 867                    include/config/auto.conf
 868         $(cmd_crmodverdir)
 869
 870 archprepare: archheaders archscripts prepare1 scripts_basic
 871
 872 prepare0: archprepare FORCE
 873         $(Q)$(MAKE) $(build)=.
 874
 875 # All the preparing..
 876 prepare: prepare0
 877
 878 # Generate some files
 879 # ---------------------------------------------------------------------------
 880
 881 # KERNELRELEASE can change from a few different places, meaning version.h
 882 # needs to be updated, so this check is forced on all builds
 883
 884 uts_len := 64
 885 define filechk_utsrelease.h
 886         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 887           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 888           exit 1;                                                         \
 889         fi;                                                               \
 890         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 891 endef
 892
 893 define filechk_version.h
 894         (echo \#define LINUX_VERSION_CODE $(shell                         \
 895         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 896         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 897 endef
 898
 899 $(version_h): $(srctree)/Makefile FORCE
 900         $(call filechk,version.h)
 901
 902 include/generated/utsrelease.h: include/config/kernel.release FORCE
 903         $(call filechk,utsrelease.h)
 904
 905 PHONY += headerdep
 906 headerdep:
 907         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 908         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 909
 910 # ---------------------------------------------------------------------------
 911
 912 PHONY += depend dep
 913 depend dep:
 914         @echo '*** Warning: make $@ is unnecessary now.'
 915
 916 # ---------------------------------------------------------------------------
 917 # Firmware install
 918 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 919 export INSTALL_FW_PATH
 920
 921 PHONY += firmware_install
 922 firmware_install: FORCE
 923         @mkdir -p $(objtree)/firmware
 924         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 925
 926 # ---------------------------------------------------------------------------
 927 # Kernel headers
 928
 929 #Default location for installed headers
 930 export INSTALL_HDR_PATH = $(objtree)/usr
 931
 932 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 933
 934 # If we do an all arch process set dst to asm-$(hdr-arch)
 935 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 936
 937 PHONY += archheaders
 938 archheaders:
 939
 940 PHONY += archscripts
 941 archscripts:
 942
 943 PHONY += __headers
 944 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
 945         $(Q)$(MAKE) $(build)=scripts build_unifdef
 946
 947 PHONY += headers_install_all
 948 headers_install_all:
 949         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
 950
 951 PHONY += headers_install
 952 headers_install: __headers
 953         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
 954           $(error Headers not exportable for the $(SRCARCH) architecture))
 955         $(Q)$(MAKE) $(hdr-inst)=include/uapi
 956         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
 957
 958 PHONY += headers_check_all
 959 headers_check_all: headers_install_all
 960         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
 961
 962 PHONY += headers_check
 963 headers_check: headers_install
 964         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
 965         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
 966
 967 # ---------------------------------------------------------------------------
 968 # Modules
 969
 970 ifdef CONFIG_MODULES
 971
 972 # By default, build modules as well
 973
 974 all: modules
 975
 976 #       Build modules
 977 #
 978 #       A module can be listed more than once in obj-m resulting in
 979 #       duplicate lines in modules.order files.  Those are removed
 980 #       using awk while concatenating to the final file.
 981
 982 PHONY += modules
 983 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
 984         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
 985         @$(kecho) '  Building modules, stage 2.';
 986         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 987         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
 988
 989 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
 990         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
 991
 992 %/modules.builtin: include/config/auto.conf
 993         $(Q)$(MAKE) $(modbuiltin)=$*
 994
 995
 996 # Target to prepare building external modules
 997 PHONY += modules_prepare
 998 modules_prepare: prepare scripts
 999
1000 # Target to install modules
1001 PHONY += modules_install
1002 modules_install: _modinst_ _modinst_post
1003
1004 PHONY += _modinst_
1005 _modinst_:
1006         @rm -rf $(MODLIB)/kernel
1007         @rm -f $(MODLIB)/source
1008         @mkdir -p $(MODLIB)/kernel
1009         @ln -s $(srctree) $(MODLIB)/source
1010         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1011                 rm -f $(MODLIB)/build ; \
1012                 ln -s $(objtree) $(MODLIB)/build ; \
1013         fi
1014         @cp -f $(objtree)/modules.order $(MODLIB)/
1015         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1016         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1017
1018 # This depmod is only for convenience to give the initial
1019 # boot a modules.dep even before / is mounted read-write.  However the
1020 # boot script depmod is the master version.
1021 PHONY += _modinst_post
1022 _modinst_post: _modinst_
1023         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1024         $(call cmd,depmod)
1025
1026 ifeq ($(CONFIG_MODULE_SIG), y)
1027 PHONY += modules_sign
1028 modules_sign:
1029         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1030 endif
1031
1032 else # CONFIG_MODULES
1033
1034 # Modules not configured
1035 # ---------------------------------------------------------------------------
1036
1037 modules modules_install: FORCE
1038         @echo >&2
1039         @echo >&2 "The present kernel configuration has modules disabled."
1040         @echo >&2 "Type 'make config' and enable loadable module support."
1041         @echo >&2 "Then build a kernel with module support enabled."
1042         @echo >&2
1043         @exit 1
1044
1045 endif # CONFIG_MODULES
1046
1047 ###
1048 # Cleaning is done on three levels.
1049 # make clean     Delete most generated files
1050 #                Leave enough to build external modules
1051 # make mrproper  Delete the current configuration, and all generated files
1052 # make distclean Remove editor backup files, patch leftover files and the like
1053
1054 # Directories & files removed with 'make clean'
1055 CLEAN_DIRS  += $(MODVERDIR)
1056
1057 # Directories & files removed with 'make mrproper'
1058 MRPROPER_DIRS  += include/config usr/include include/generated          \
1059                   arch/*/include/generated
1060 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1061                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1062                   signing_key.priv signing_key.x509 x509.genkey         \
1063                   extra_certificates signing_key.x509.keyid             \
1064                   signing_key.x509.signer
1065
1066 # clean - Delete most, but leave enough to build external modules
1067 #
1068 clean: rm-dirs  := $(CLEAN_DIRS)
1069 clean: rm-files := $(CLEAN_FILES)
1070 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1071
1072 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1073 $(clean-dirs):
1074         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1075
1076 vmlinuxclean:
1077         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1078
1079 clean: archclean vmlinuxclean
1080
1081 # mrproper - Delete all generated files, including .config
1082 #
1083 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1084 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1085 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1086
1087 PHONY += $(mrproper-dirs) mrproper archmrproper
1088 $(mrproper-dirs):
1089         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1090
1091 mrproper: clean archmrproper $(mrproper-dirs)
1092         $(call cmd,rmdirs)
1093         $(call cmd,rmfiles)
1094
1095 # distclean
1096 #
1097 PHONY += distclean
1098
1099 distclean: mrproper
1100         @find $(srctree) $(RCS_FIND_IGNORE) \
1101                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1102                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1103                 -o -name '.*.rej' \
1104                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1105                 -type f -print | xargs rm -f
1106
1107
1108 # Packaging of the kernel to various formats
1109 # ---------------------------------------------------------------------------
1110 # rpm target kept for backward compatibility
1111 package-dir     := $(srctree)/scripts/package
1112
1113 %src-pkg: FORCE
1114         $(Q)$(MAKE) $(build)=$(package-dir) $@
1115 %pkg: include/config/kernel.release FORCE
1116         $(Q)$(MAKE) $(build)=$(package-dir) $@
1117 rpm: include/config/kernel.release FORCE
1118         $(Q)$(MAKE) $(build)=$(package-dir) $@
1119
1120
1121 # Brief documentation of the typical targets used
1122 # ---------------------------------------------------------------------------
1123
1124 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1125 boards := $(notdir $(boards))
1126 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1127 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1128
1129 help:
1130         @echo  'Cleaning targets:'
1131         @echo  '  clean           - Remove most generated files but keep the config and'
1132         @echo  '                    enough build support to build external modules'
1133         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1134         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1135         @echo  ''
1136         @echo  'Configuration targets:'
1137         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1138         @echo  ''
1139         @echo  'Other generic targets:'
1140         @echo  '  all             - Build all targets marked with [*]'
1141         @echo  '* vmlinux         - Build the bare kernel'
1142         @echo  '* modules         - Build all modules'
1143         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1144         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1145         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1146         @echo  '  dir/            - Build all files in dir and below'
1147         @echo  '  dir/file.[oisS] - Build specified target only'
1148         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1149         @echo  '                    (requires a recent binutils and recent build (System.map))'
1150         @echo  '  dir/file.ko     - Build module including final link'
1151         @echo  '  modules_prepare - Set up for building external modules'
1152         @echo  '  tags/TAGS       - Generate tags file for editors'
1153         @echo  '  cscope          - Generate cscope index'
1154         @echo  '  gtags           - Generate GNU GLOBAL index'
1155         @echo  '  kernelrelease   - Output the release version string'
1156         @echo  '  kernelversion   - Output the version stored in Makefile'
1157         @echo  '  image_name      - Output the image name'
1158         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1159          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1160          echo  ''
1161         @echo  'Static analysers'
1162         @echo  '  checkstack      - Generate a list of stack hogs'
1163         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1164         @echo  '  versioncheck    - Sanity check on version.h usage'
1165         @echo  '  includecheck    - Check for duplicate included header files'
1166         @echo  '  export_report   - List the usages of all exported symbols'
1167         @echo  '  headers_check   - Sanity check on exported headers'
1168         @echo  '  headerdep       - Detect inclusion cycles in headers'
1169         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1170         @echo  ''
1171         @echo  'Kernel packaging:'
1172         @$(MAKE) $(build)=$(package-dir) help
1173         @echo  ''
1174         @echo  'Documentation targets:'
1175         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1176         @echo  ''
1177         @echo  'Architecture specific targets ($(SRCARCH)):'
1178         @$(if $(archhelp),$(archhelp),\
1179                 echo '  No architecture specific help defined for $(SRCARCH)')
1180         @echo  ''
1181         @$(if $(boards), \
1182                 $(foreach b, $(boards), \
1183                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1184                 echo '')
1185         @$(if $(board-dirs), \
1186                 $(foreach b, $(board-dirs), \
1187                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1188                 printf "  %-16s - Show all of the above\\n" help-boards; \
1189                 echo '')
1190
1191         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1192         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1193         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1194         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1195         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1196         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1197         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1198         @echo  '                1: warnings which may be relevant and do not occur too often'
1199         @echo  '                2: warnings which occur quite often but may still be relevant'
1200         @echo  '                3: more obscure warnings, can most likely be ignored'
1201         @echo  '                Multiple levels can be combined with W=12 or W=123'
1202         @echo  ''
1203         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1204         @echo  'For further info see the ./README file'
1205
1206
1207 help-board-dirs := $(addprefix help-,$(board-dirs))
1208
1209 help-boards: $(help-board-dirs)
1210
1211 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1212
1213 $(help-board-dirs): help-%:
1214         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1215         @$(if $(boards-per-dir), \
1216                 $(foreach b, $(boards-per-dir), \
1217                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1218                 echo '')
1219
1220
1221 # Documentation targets
1222 # ---------------------------------------------------------------------------
1223 %docs: scripts_basic FORCE
1224         $(Q)$(MAKE) $(build)=scripts build_docproc
1225         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1226
1227 else # KBUILD_EXTMOD
1228
1229 ###
1230 # External module support.
1231 # When building external modules the kernel used as basis is considered
1232 # read-only, and no consistency checks are made and the make
1233 # system is not used on the basis kernel. If updates are required
1234 # in the basis kernel ordinary make commands (without M=...) must
1235 # be used.
1236 #
1237 # The following are the only valid targets when building external
1238 # modules.
1239 # make M=dir clean     Delete all automatically generated files
1240 # make M=dir modules   Make all modules in specified dir
1241 # make M=dir           Same as 'make M=dir modules'
1242 # make M=dir modules_install
1243 #                      Install the modules built in the module directory
1244 #                      Assumes install directory is already created
1245
1246 # We are always building modules
1247 KBUILD_MODULES := 1
1248 PHONY += crmodverdir
1249 crmodverdir:
1250         $(cmd_crmodverdir)
1251
1252 PHONY += $(objtree)/Module.symvers
1253 $(objtree)/Module.symvers:
1254         @test -e $(objtree)/Module.symvers || ( \
1255         echo; \
1256         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1257         echo "           is missing; modules will have no dependencies and modversions."; \
1258         echo )
1259
1260 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1261 PHONY += $(module-dirs) modules
1262 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1263         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1264
1265 modules: $(module-dirs)
1266         @$(kecho) '  Building modules, stage 2.';
1267         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1268
1269 PHONY += modules_install
1270 modules_install: _emodinst_ _emodinst_post
1271
1272 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1273 PHONY += _emodinst_
1274 _emodinst_:
1275         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1276         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1277
1278 PHONY += _emodinst_post
1279 _emodinst_post: _emodinst_
1280         $(call cmd,depmod)
1281
1282 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1283
1284 PHONY += $(clean-dirs) clean
1285 $(clean-dirs):
1286         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1287
1288 clean:  rm-dirs := $(MODVERDIR)
1289 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1290
1291 help:
1292         @echo  '  Building external modules.'
1293         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1294         @echo  ''
1295         @echo  '  modules         - default target, build the module(s)'
1296         @echo  '  modules_install - install the module'
1297         @echo  '  clean           - remove generated files in module directory only'
1298         @echo  ''
1299
1300 # Dummies...
1301 PHONY += prepare scripts
1302 prepare: ;
1303 scripts: ;
1304 endif # KBUILD_EXTMOD
1305
1306 clean: $(clean-dirs)
1307         $(call cmd,rmdirs)
1308         $(call cmd,rmfiles)
1309         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1310                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1311                 -o -name '*.ko.*' \
1312                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1313                 -o -name '*.symtypes' -o -name 'modules.order' \
1314                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1315                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1316
1317 # Generate tags for editors
1318 # ---------------------------------------------------------------------------
1319 quiet_cmd_tags = GEN     $@
1320       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1321
1322 tags TAGS cscope gtags: FORCE
1323         $(call cmd,tags)
1324
1325 # Scripts to check various things for consistency
1326 # ---------------------------------------------------------------------------
1327
1328 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1329
1330 includecheck:
1331         find $(srctree)/* $(RCS_FIND_IGNORE) \
1332                 -name '*.[hcS]' -type f -print | sort \
1333                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1334
1335 versioncheck:
1336         find $(srctree)/* $(RCS_FIND_IGNORE) \
1337                 -name '*.[hcS]' -type f -print | sort \
1338                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1339
1340 coccicheck:
1341         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1342
1343 namespacecheck:
1344         $(PERL) $(srctree)/scripts/namespace.pl
1345
1346 export_report:
1347         $(PERL) $(srctree)/scripts/export_report.pl
1348
1349 endif #ifeq ($(config-targets),1)
1350 endif #ifeq ($(mixed-targets),1)
1351
1352 PHONY += checkstack kernelrelease kernelversion image_name
1353
1354 # UML needs a little special treatment here.  It wants to use the host
1355 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1356 # else wants $(ARCH), including people doing cross-builds, which means
1357 # that $(SUBARCH) doesn't work here.
1358 ifeq ($(ARCH), um)
1359 CHECKSTACK_ARCH := $(SUBARCH)
1360 else
1361 CHECKSTACK_ARCH := $(ARCH)
1362 endif
1363 checkstack:
1364         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1365         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1366
1367 kernelrelease:
1368         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1369
1370 kernelversion:
1371         @echo $(KERNELVERSION)
1372
1373 image_name:
1374         @echo $(KBUILD_IMAGE)
1375
1376 # Clear a bunch of variables before executing the submake
1377 tools/: FORCE
1378         $(Q)mkdir -p $(objtree)/tools
1379         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1380
1381 tools/%: FORCE
1382         $(Q)mkdir -p $(objtree)/tools
1383         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1384
1385 # Single targets
1386 # ---------------------------------------------------------------------------
1387 # Single targets are compatible with:
1388 # - build with mixed source and output
1389 # - build with separate output dir 'make O=...'
1390 # - external modules
1391 #
1392 #  target-dir => where to store outputfile
1393 #  build-dir  => directory in kernel source tree to use
1394
1395 ifeq ($(KBUILD_EXTMOD),)
1396         build-dir  = $(patsubst %/,%,$(dir $@))
1397         target-dir = $(dir $@)
1398 else
1399         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1400         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1401         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1402 endif
1403
1404 %.s: %.c prepare scripts FORCE
1405         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1406 %.i: %.c prepare scripts FORCE
1407         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1408 %.o: %.c prepare scripts FORCE
1409         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1410 %.lst: %.c prepare scripts FORCE
1411         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1412 %.s: %.S prepare scripts FORCE
1413         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1414 %.o: %.S prepare scripts FORCE
1415         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1416 %.symtypes: %.c prepare scripts FORCE
1417         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1418
1419 # Modules
1420 /: prepare scripts FORCE
1421         $(cmd_crmodverdir)
1422         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1423         $(build)=$(build-dir)
1424 %/: prepare scripts FORCE
1425         $(cmd_crmodverdir)
1426         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1427         $(build)=$(build-dir)
1428 %.ko: prepare scripts FORCE
1429         $(cmd_crmodverdir)
1430         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1431         $(build)=$(build-dir) $(@:.ko=.o)
1432         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1433
1434 # FIXME Should go into a make.lib or something
1435 # ===========================================================================
1436
1437 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1438       cmd_rmdirs = rm -rf $(rm-dirs)
1439
1440 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1441       cmd_rmfiles = rm -f $(rm-files)
1442
1443 # Run depmod only if we have System.map and depmod is executable
1444 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1445       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1446                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1447
1448 # Create temporary dir for module support files
1449 # clean it up only when building all modules
1450 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1451                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1452
1453 # read all saved command lines
1454
1455 targets := $(wildcard $(sort $(targets)))
1456 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1457
1458 ifneq ($(cmd_files),)
1459   $(cmd_files): ;       # Do not try to update included dependency files
1460   include $(cmd_files)
1461 endif
1462
1463 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1464 # Usage:
1465 # $(Q)$(MAKE) $(clean)=dir
1466 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1467
1468 endif   # skip-makefile
1469
1470 PHONY += FORCE
1471 FORCE:
1472
1473 # Declare the contents of the .PHONY variable as phony.  We keep that
1474 # information in a variable so we can use it in if_changed and friends.
1475 .PHONY: $(PHONY)