Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 36
   4 EXTRAVERSION =
   5 NAME = Flesh-Eating Bats with Fangs
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # Do not:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoids hard-to-debug behaviour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # Avoid funny character set dependencies
  20 unexport LC_ALL
  21 LC_COLLATE=C
  22 LC_NUMERIC=C
  23 export LC_COLLATE LC_NUMERIC
  24
  25 # We are using a recursive build, so we need to do a little thinking
  26 # to get the ordering right.
  27 #
  28 # Most importantly: sub-Makefiles should only ever modify files in
  29 # their own directory. If in some directory we have a dependency on
  30 # a file in another dir (which doesn't happen often, but it's often
  31 # unavoidable when linking the built-in.o targets which finally
  32 # turn into vmlinux), we will call a sub make in that other dir, and
  33 # after that we are sure that everything which is in that other dir
  34 # is now up to date.
  35 #
  36 # The only cases where we need to modify files which have global
  37 # effects are thus separated out and done before the recursive
  38 # descending is started. They are now explicitly listed as the
  39 # prepare rule.
  40
  41 # To put more focus on warnings, be less verbose as default
  42 # Use 'make V=1' to see the full commands
  43
  44 ifeq ("$(origin V)", "command line")
  45   KBUILD_VERBOSE = $(V)
  46 endif
  47 ifndef KBUILD_VERBOSE
  48   KBUILD_VERBOSE = 0
  49 endif
  50
  51 # Call a source code checker (by default, "sparse") as part of the
  52 # C compilation.
  53 #
  54 # Use 'make C=1' to enable checking of only re-compiled files.
  55 # Use 'make C=2' to enable checking of *all* source files, regardless
  56 # of whether they are re-compiled or not.
  57 #
  58 # See the file "Documentation/sparse.txt" for more details, including
  59 # where to get the "sparse" utility.
  60
  61 ifeq ("$(origin C)", "command line")
  62   KBUILD_CHECKSRC = $(C)
  63 endif
  64 ifndef KBUILD_CHECKSRC
  65   KBUILD_CHECKSRC = 0
  66 endif
  67
  68 # Use make M=dir to specify directory of external module to build
  69 # Old syntax make ... SUBDIRS=$PWD is still supported
  70 # Setting the environment variable KBUILD_EXTMOD take precedence
  71 ifdef SUBDIRS
  72   KBUILD_EXTMOD ?= $(SUBDIRS)
  73 endif
  74
  75 ifeq ("$(origin M)", "command line")
  76   KBUILD_EXTMOD := $(M)
  77 endif
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(KBUILD_SRC),)
  98
  99 # OK, Make called in directory where kernel src resides
 100 # Do we want to locate output files in a separate directory?
 101 ifeq ("$(origin O)", "command line")
 102   KBUILD_OUTPUT := $(O)
 103 endif
 104
 105 # That's our default target when none is given on the command line
 106 PHONY := _all
 107 _all:
 108
 109 # Cancel implicit rules on top Makefile
 110 $(CURDIR)/Makefile Makefile: ;
 111
 112 ifneq ($(KBUILD_OUTPUT),)
 113 # Invoke a second make in the output directory, passing relevant variables
 114 # check that the output directory actually exists
 115 saved-output := $(KBUILD_OUTPUT)
 116 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 117 $(if $(KBUILD_OUTPUT),, \
 118      $(error output directory "$(saved-output)" does not exist))
 119
 120 PHONY += $(MAKECMDGOALS) sub-make
 121
 122 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 123         $(Q)@:
 124
 125 sub-make: FORCE
 126         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 127         KBUILD_SRC=$(CURDIR) \
 128         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 129         $(filter-out _all sub-make,$(MAKECMDGOALS))
 130
 131 # Leave processing to above invocation of make
 132 skip-makefile := 1
 133 endif # ifneq ($(KBUILD_OUTPUT),)
 134 endif # ifeq ($(KBUILD_SRC),)
 135
 136 # We process the rest of the Makefile if this is the final invocation of make
 137 ifeq ($(skip-makefile),)
 138
 139 # If building an external module we do not care about the all: rule
 140 # but instead _all depend on modules
 141 PHONY += all
 142 ifeq ($(KBUILD_EXTMOD),)
 143 _all: all
 144 else
 145 _all: modules
 146 endif
 147
 148 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 149 objtree         := $(CURDIR)
 150 src             := $(srctree)
 151 obj             := $(objtree)
 152
 153 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 154
 155 export srctree objtree VPATH
 156
 157
 158 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 159 # first, and if a usermode build is happening, the "ARCH=um" on the command
 160 # line overrides the setting of ARCH below.  If a native build is happening,
 161 # then ARCH is assigned, getting whatever value it gets normally, and
 162 # SUBARCH is subsequently ignored.
 163
 164 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 165                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 166                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 167                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 168                                   -e s/sh[234].*/sh/ )
 169
 170 # Cross compiling and selecting different set of gcc/bin-utils
 171 # ---------------------------------------------------------------------------
 172 #
 173 # When performing cross compilation for other architectures ARCH shall be set
 174 # to the target architecture. (See arch/* for the possibilities).
 175 # ARCH can be set during invocation of make:
 176 # make ARCH=ia64
 177 # Another way is to have ARCH set in the environment.
 178 # The default ARCH is the host where make is executed.
 179
 180 # CROSS_COMPILE specify the prefix used for all executables used
 181 # during compilation. Only gcc and related bin-utils executables
 182 # are prefixed with $(CROSS_COMPILE).
 183 # CROSS_COMPILE can be set on the command line
 184 # make CROSS_COMPILE=ia64-linux-
 185 # Alternatively CROSS_COMPILE can be set in the environment.
 186 # A third alternative is to store a setting in .config so that plain
 187 # "make" in the configured kernel build directory always uses that.
 188 # Default value for CROSS_COMPILE is not to prefix executables
 189 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 190 export KBUILD_BUILDHOST := $(SUBARCH)
 191 ARCH            ?= $(SUBARCH)
 192 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 193
 194 # Architecture as present in compile.h
 195 UTS_MACHINE     := $(ARCH)
 196 SRCARCH         := $(ARCH)
 197
 198 # Additional ARCH settings for x86
 199 ifeq ($(ARCH),i386)
 200         SRCARCH := x86
 201 endif
 202 ifeq ($(ARCH),x86_64)
 203         SRCARCH := x86
 204 endif
 205
 206 # Additional ARCH settings for sparc
 207 ifeq ($(ARCH),sparc64)
 208        SRCARCH := sparc
 209 endif
 210
 211 # Additional ARCH settings for sh
 212 ifeq ($(ARCH),sh64)
 213        SRCARCH := sh
 214 endif
 215
 216 # Where to locate arch specific headers
 217 hdr-arch  := $(SRCARCH)
 218
 219 ifeq ($(ARCH),m68knommu)
 220        hdr-arch  := m68k
 221 endif
 222
 223 KCONFIG_CONFIG  ?= .config
 224
 225 # SHELL used by kbuild
 226 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 227           else if [ -x /bin/bash ]; then echo /bin/bash; \
 228           else echo sh; fi ; fi)
 229
 230 HOSTCC       = gcc
 231 HOSTCXX      = g++
 232 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 233 HOSTCXXFLAGS = -O2
 234
 235 # Decide whether to build built-in, modular, or both.
 236 # Normally, just do built-in.
 237
 238 KBUILD_MODULES :=
 239 KBUILD_BUILTIN := 1
 240
 241 #       If we have only "make modules", don't compile built-in objects.
 242 #       When we're building modules with modversions, we need to consider
 243 #       the built-in objects during the descend as well, in order to
 244 #       make sure the checksums are up to date before we record them.
 245
 246 ifeq ($(MAKECMDGOALS),modules)
 247   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 248 endif
 249
 250 #       If we have "make <whatever> modules", compile modules
 251 #       in addition to whatever we do anyway.
 252 #       Just "make" or "make all" shall build modules as well
 253
 254 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 255   KBUILD_MODULES := 1
 256 endif
 257
 258 ifeq ($(MAKECMDGOALS),)
 259   KBUILD_MODULES := 1
 260 endif
 261
 262 export KBUILD_MODULES KBUILD_BUILTIN
 263 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 264
 265 # Beautify output
 266 # ---------------------------------------------------------------------------
 267 #
 268 # Normally, we echo the whole command before executing it. By making
 269 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 270 # $(quiet) to choose other forms of output instead, e.g.
 271 #
 272 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 273 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 274 #
 275 # If $(quiet) is empty, the whole command will be printed.
 276 # If it is set to "quiet_", only the short version will be printed.
 277 # If it is set to "silent_", nothing will be printed at all, since
 278 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 279 #
 280 # A simple variant is to prefix commands with $(Q) - that's useful
 281 # for commands that shall be hidden in non-verbose mode.
 282 #
 283 #       $(Q)ln $@ :<
 284 #
 285 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 286 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 287
 288 ifeq ($(KBUILD_VERBOSE),1)
 289   quiet =
 290   Q =
 291 else
 292   quiet=quiet_
 293   Q = @
 294 endif
 295
 296 # If the user is running make -s (silent mode), suppress echoing of
 297 # commands
 298
 299 ifneq ($(findstring s,$(MAKEFLAGS)),)
 300   quiet=silent_
 301 endif
 302
 303 export quiet Q KBUILD_VERBOSE
 304
 305
 306 # Look for make include files relative to root of kernel src
 307 MAKEFLAGS += --include-dir=$(srctree)
 308
 309 # We need some generic definitions (do not try to remake the file).
 310 $(srctree)/scripts/Kbuild.include: ;
 311 include $(srctree)/scripts/Kbuild.include
 312
 313 # Make variables (CC, etc...)
 314
 315 AS              = $(CROSS_COMPILE)as
 316 LD              = $(CROSS_COMPILE)ld
 317 CC              = $(CROSS_COMPILE)gcc
 318 CPP             = $(CC) -E
 319 AR              = $(CROSS_COMPILE)ar
 320 NM              = $(CROSS_COMPILE)nm
 321 STRIP           = $(CROSS_COMPILE)strip
 322 OBJCOPY         = $(CROSS_COMPILE)objcopy
 323 OBJDUMP         = $(CROSS_COMPILE)objdump
 324 AWK             = awk
 325 GENKSYMS        = scripts/genksyms/genksyms
 326 INSTALLKERNEL  := installkernel
 327 DEPMOD          = /sbin/depmod
 328 KALLSYMS        = scripts/kallsyms
 329 PERL            = perl
 330 CHECK           = sparse
 331
 332 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 333                   -Wbitwise -Wno-return-void $(CF)
 334 CFLAGS_MODULE   =
 335 AFLAGS_MODULE   =
 336 LDFLAGS_MODULE  =
 337 CFLAGS_KERNEL   =
 338 AFLAGS_KERNEL   =
 339 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 340
 341
 342 # Use LINUXINCLUDE when you must reference the include/ directory.
 343 # Needed to be compatible with the O= option
 344 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 345                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 346                    -include include/generated/autoconf.h
 347
 348 KBUILD_CPPFLAGS := -D__KERNEL__
 349
 350 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 351                    -fno-strict-aliasing -fno-common \
 352                    -Werror-implicit-function-declaration \
 353                    -Wno-format-security \
 354                    -fno-delete-null-pointer-checks
 355 KBUILD_AFLAGS_KERNEL :=
 356 KBUILD_CFLAGS_KERNEL :=
 357 KBUILD_AFLAGS   := -D__ASSEMBLY__
 358 KBUILD_AFLAGS_MODULE  := -DMODULE
 359 KBUILD_CFLAGS_MODULE  := -DMODULE
 360 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 361
 362 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 363 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 364 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 365
 366 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 367 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 368 export CPP AR NM STRIP OBJCOPY OBJDUMP
 369 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 370 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 371
 372 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 373 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 374 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 375 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 376 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 377
 378 # When compiling out-of-tree modules, put MODVERDIR in the module
 379 # tree rather than in the kernel tree. The kernel tree might
 380 # even be read-only.
 381 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 382
 383 # Files to ignore in find ... statements
 384
 385 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 386 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 387
 388 # ===========================================================================
 389 # Rules shared between *config targets and build targets
 390
 391 # Basic helpers built in scripts/
 392 PHONY += scripts_basic
 393 scripts_basic:
 394         $(Q)$(MAKE) $(build)=scripts/basic
 395         $(Q)rm -f .tmp_quiet_recordmcount
 396
 397 # To avoid any implicit rule to kick in, define an empty command.
 398 scripts/basic/%: scripts_basic ;
 399
 400 PHONY += outputmakefile
 401 # outputmakefile generates a Makefile in the output directory, if using a
 402 # separate output directory. This allows convenient use of make in the
 403 # output directory.
 404 outputmakefile:
 405 ifneq ($(KBUILD_SRC),)
 406         $(Q)ln -fsn $(srctree) source
 407         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 408             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 409 endif
 410
 411 # To make sure we do not include .config for any of the *config targets
 412 # catch them early, and hand them over to scripts/kconfig/Makefile
 413 # It is allowed to specify more targets when calling make, including
 414 # mixing *config targets and build targets.
 415 # For example 'make oldconfig all'.
 416 # Detect when mixed targets is specified, and make a second invocation
 417 # of make so .config is not included in this case either (for *config).
 418
 419 no-dot-config-targets := clean mrproper distclean \
 420                          cscope TAGS tags help %docs check% coccicheck \
 421                          include/linux/version.h headers_% \
 422                          kernelversion %src-pkg
 423
 424 config-targets := 0
 425 mixed-targets  := 0
 426 dot-config     := 1
 427
 428 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 429         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 430                 dot-config := 0
 431         endif
 432 endif
 433
 434 ifeq ($(KBUILD_EXTMOD),)
 435         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 436                 config-targets := 1
 437                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 438                         mixed-targets := 1
 439                 endif
 440         endif
 441 endif
 442
 443 ifeq ($(mixed-targets),1)
 444 # ===========================================================================
 445 # We're called with mixed targets (*config and build targets).
 446 # Handle them one by one.
 447
 448 %:: FORCE
 449         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 450
 451 else
 452 ifeq ($(config-targets),1)
 453 # ===========================================================================
 454 # *config targets only - make sure prerequisites are updated, and descend
 455 # in scripts/kconfig to make the *config target
 456
 457 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 458 # KBUILD_DEFCONFIG may point out an alternative default configuration
 459 # used for 'make defconfig'
 460 include $(srctree)/arch/$(SRCARCH)/Makefile
 461 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 462
 463 config: scripts_basic outputmakefile FORCE
 464         $(Q)mkdir -p include/linux include/config
 465         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 466
 467 %config: scripts_basic outputmakefile FORCE
 468         $(Q)mkdir -p include/linux include/config
 469         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 470
 471 else
 472 # ===========================================================================
 473 # Build targets only - this includes vmlinux, arch specific targets, clean
 474 # targets and others. In general all targets except *config targets.
 475
 476 ifeq ($(KBUILD_EXTMOD),)
 477 # Additional helpers built in scripts/
 478 # Carefully list dependencies so we do not try to build scripts twice
 479 # in parallel
 480 PHONY += scripts
 481 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 482         $(Q)$(MAKE) $(build)=$(@)
 483
 484 # Objects we will link into vmlinux / subdirs we need to visit
 485 init-y          := init/
 486 drivers-y       := drivers/ sound/ firmware/
 487 net-y           := net/
 488 libs-y          := lib/
 489 core-y          := usr/
 490 endif # KBUILD_EXTMOD
 491
 492 ifeq ($(dot-config),1)
 493 # Read in config
 494 -include include/config/auto.conf
 495
 496 ifeq ($(KBUILD_EXTMOD),)
 497 # Read in dependencies to all Kconfig* files, make sure to run
 498 # oldconfig if changes are detected.
 499 -include include/config/auto.conf.cmd
 500
 501 # To avoid any implicit rule to kick in, define an empty command
 502 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 503
 504 # If .config is newer than include/config/auto.conf, someone tinkered
 505 # with it and forgot to run make oldconfig.
 506 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 507 # we execute the config step to be sure to catch updated Kconfig files
 508 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 509         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 510 else
 511 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 512 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 513 PHONY += include/config/auto.conf
 514
 515 include/config/auto.conf:
 516         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 517         echo;                                                           \
 518         echo "  ERROR: Kernel configuration is invalid.";               \
 519         echo "         include/generated/autoconf.h or $@ are missing.";\
 520         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 521         echo;                                                           \
 522         /bin/false)
 523
 524 endif # KBUILD_EXTMOD
 525
 526 else
 527 # Dummy target needed, because used as prerequisite
 528 include/config/auto.conf: ;
 529 endif # $(dot-config)
 530
 531 # The all: target is the default when no target is given on the
 532 # command line.
 533 # This allow a user to issue only 'make' to build a kernel including modules
 534 # Defaults to vmlinux, but the arch makefile usually adds further targets
 535 all: vmlinux
 536
 537 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 538 KBUILD_CFLAGS   += -Os
 539 else
 540 KBUILD_CFLAGS   += -O2
 541 endif
 542
 543 include $(srctree)/arch/$(SRCARCH)/Makefile
 544
 545 ifneq ($(CONFIG_FRAME_WARN),0)
 546 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 547 endif
 548
 549 # Force gcc to behave correct even for buggy distributions
 550 ifndef CONFIG_CC_STACKPROTECTOR
 551 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 552 endif
 553
 554 ifdef CONFIG_FRAME_POINTER
 555 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 556 else
 557 KBUILD_CFLAGS   += -fomit-frame-pointer
 558 endif
 559
 560 ifdef CONFIG_DEBUG_INFO
 561 KBUILD_CFLAGS   += -g
 562 KBUILD_AFLAGS   += -gdwarf-2
 563 endif
 564
 565 ifdef CONFIG_DEBUG_INFO_REDUCED
 566 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 567 endif
 568
 569 ifdef CONFIG_FUNCTION_TRACER
 570 KBUILD_CFLAGS   += -pg
 571 endif
 572
 573 # We trigger additional mismatches with less inlining
 574 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 575 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 576 endif
 577
 578 # arch Makefile may override CC so keep this after arch Makefile is included
 579 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 580 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 581
 582 # warn about C99 declaration after statement
 583 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 584
 585 # disable pointer signed / unsigned warnings in gcc 4.0
 586 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 587
 588 # disable invalid "can't wrap" optimizations for signed / pointers
 589 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 590
 591 # conserve stack if available
 592 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 593
 594 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 595 # But warn user when we do so
 596 warn-assign = \
 597 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 598
 599 ifneq ($(KCPPFLAGS),)
 600         $(call warn-assign,CPPFLAGS)
 601         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 602 endif
 603 ifneq ($(KAFLAGS),)
 604         $(call warn-assign,AFLAGS)
 605         KBUILD_AFLAGS += $(KAFLAGS)
 606 endif
 607 ifneq ($(KCFLAGS),)
 608         $(call warn-assign,CFLAGS)
 609         KBUILD_CFLAGS += $(KCFLAGS)
 610 endif
 611
 612 # Use --build-id when available.
 613 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 614                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 615 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 616 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 617
 618 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 619 LDFLAGS_vmlinux += $(call ld-option, -X,)
 620 endif
 621
 622 # Default kernel image to build when no specific target is given.
 623 # KBUILD_IMAGE may be overruled on the command line or
 624 # set in the environment
 625 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 626 # this default value
 627 export KBUILD_IMAGE ?= vmlinux
 628
 629 #
 630 # INSTALL_PATH specifies where to place the updated kernel and system map
 631 # images. Default is /boot, but you can set it to other values
 632 export  INSTALL_PATH ?= /boot
 633
 634 #
 635 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 636 # relocations required by build roots.  This is not defined in the
 637 # makefile but the argument can be passed to make if needed.
 638 #
 639
 640 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 641 export MODLIB
 642
 643 #
 644 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 645 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 646 #  the default option --strip-debug will be used.  Otherwise,
 647 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 648
 649 ifdef INSTALL_MOD_STRIP
 650 ifeq ($(INSTALL_MOD_STRIP),1)
 651 mod_strip_cmd = $(STRIP) --strip-debug
 652 else
 653 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 654 endif # INSTALL_MOD_STRIP=1
 655 else
 656 mod_strip_cmd = true
 657 endif # INSTALL_MOD_STRIP
 658 export mod_strip_cmd
 659
 660
 661 ifeq ($(KBUILD_EXTMOD),)
 662 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 663
 664 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 665                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 666                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 667
 668 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 669                      $(init-n) $(init-) \
 670                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 671                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 672
 673 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 674 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 675 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 676 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 677 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 678 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 679 libs-y          := $(libs-y1) $(libs-y2)
 680
 681 # Build vmlinux
 682 # ---------------------------------------------------------------------------
 683 # vmlinux is built from the objects selected by $(vmlinux-init) and
 684 # $(vmlinux-main). Most are built-in.o files from top-level directories
 685 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 686 # Ordering when linking is important, and $(vmlinux-init) must be first.
 687 #
 688 # vmlinux
 689 #   ^
 690 #   |
 691 #   +-< $(vmlinux-init)
 692 #   |   +--< init/version.o + more
 693 #   |
 694 #   +--< $(vmlinux-main)
 695 #   |    +--< driver/built-in.o mm/built-in.o + more
 696 #   |
 697 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 698 #
 699 # vmlinux version (uname -v) cannot be updated during normal
 700 # descending-into-subdirs phase since we do not yet know if we need to
 701 # update vmlinux.
 702 # Therefore this step is delayed until just before final link of vmlinux -
 703 # except in the kallsyms case where it is done just before adding the
 704 # symbols to the kernel.
 705 #
 706 # System.map is generated to document addresses of all kernel symbols
 707
 708 vmlinux-init := $(head-y) $(init-y)
 709 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 710 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 711 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 712 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 713
 714 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 715 # May be overridden by arch/$(ARCH)/Makefile
 716 quiet_cmd_vmlinux__ ?= LD      $@
 717       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 718       -T $(vmlinux-lds) $(vmlinux-init)                          \
 719       --start-group $(vmlinux-main) --end-group                  \
 720       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 721
 722 # Generate new vmlinux version
 723 quiet_cmd_vmlinux_version = GEN     .version
 724       cmd_vmlinux_version = set -e;                     \
 725         if [ ! -r .version ]; then                      \
 726           rm -f .version;                               \
 727           echo 1 >.version;                             \
 728         else                                            \
 729           mv .version .old_version;                     \
 730           expr 0$$(cat .old_version) + 1 >.version;     \
 731         fi;                                             \
 732         $(MAKE) $(build)=init
 733
 734 # Generate System.map
 735 quiet_cmd_sysmap = SYSMAP
 736       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 737
 738 # Link of vmlinux
 739 # If CONFIG_KALLSYMS is set .version is already updated
 740 # Generate System.map and verify that the content is consistent
 741 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 742 # First command is ':' to allow us to use + in front of the rule
 743 define rule_vmlinux__
 744         :
 745         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 746
 747         $(call cmd,vmlinux__)
 748         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 749
 750         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 751           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 752         $(cmd_sysmap) $@ System.map;                                         \
 753         if [ $$? -ne 0 ]; then                                               \
 754                 rm -f $@;                                                    \
 755                 /bin/false;                                                  \
 756         fi;
 757         $(verify_kallsyms)
 758 endef
 759
 760
 761 ifdef CONFIG_KALLSYMS
 762 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 763 # It's a three stage process:
 764 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 765 #   empty
 766 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 767 #   the right size - vmlinux version (uname -v) is updated during this step
 768 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 769 #   but due to the added section, some addresses have shifted.
 770 #   From here, we generate a correct .tmp_kallsyms2.o
 771 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 772 # o Verify that the System.map from vmlinux matches the map from
 773 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 774 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 775 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 776 #   temporary bypass to allow the kernel to be built while the
 777 #   maintainers work out what went wrong with kallsyms.
 778
 779 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 780 last_kallsyms := 3
 781 else
 782 last_kallsyms := 2
 783 endif
 784
 785 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 786
 787 define verify_kallsyms
 788         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 789           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 790           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 791         $(Q)cmp -s System.map .tmp_System.map ||                             \
 792                 (echo Inconsistent kallsyms data;                            \
 793                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 794                  rm .tmp_kallsyms* ; /bin/false )
 795 endef
 796
 797 # Update vmlinux version before link
 798 # Use + in front of this rule to silent warning about make -j1
 799 # First command is ':' to allow us to use + in front of this rule
 800 cmd_ksym_ld = $(cmd_vmlinux__)
 801 define rule_ksym_ld
 802         :
 803         +$(call cmd,vmlinux_version)
 804         $(call cmd,vmlinux__)
 805         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 806 endef
 807
 808 # Generate .S file with all kernel symbols
 809 quiet_cmd_kallsyms = KSYM    $@
 810       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 811                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 812
 813 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 814         $(call if_changed_dep,as_o_S)
 815
 816 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 817         $(call cmd,kallsyms)
 818
 819 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 820 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 821         $(call if_changed_rule,ksym_ld)
 822
 823 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 824         $(call if_changed,vmlinux__)
 825
 826 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 827         $(call if_changed,vmlinux__)
 828
 829 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 830 $(KALLSYMS): scripts ;
 831
 832 # Generate some data for debugging strange kallsyms problems
 833 debug_kallsyms: .tmp_map$(last_kallsyms)
 834
 835 .tmp_map%: .tmp_vmlinux% FORCE
 836         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 837
 838 .tmp_map3: .tmp_map2
 839
 840 .tmp_map2: .tmp_map1
 841
 842 endif # ifdef CONFIG_KALLSYMS
 843
 844 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 845 # relevant sections renamed as per the linker script.
 846 quiet_cmd_vmlinux-modpost = LD      $@
 847       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 848          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 849          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 850 define rule_vmlinux-modpost
 851         :
 852         +$(call cmd,vmlinux-modpost)
 853         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 854         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 855 endef
 856
 857 # vmlinux image - including updated kernel symbols
 858 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 859 ifdef CONFIG_HEADERS_CHECK
 860         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 861 endif
 862 ifdef CONFIG_SAMPLES
 863         $(Q)$(MAKE) $(build)=samples
 864 endif
 865 ifdef CONFIG_BUILD_DOCSRC
 866         $(Q)$(MAKE) $(build)=Documentation
 867 endif
 868         $(call vmlinux-modpost)
 869         $(call if_changed_rule,vmlinux__)
 870         $(Q)rm -f .old_version
 871
 872 # build vmlinux.o first to catch section mismatch errors early
 873 ifdef CONFIG_KALLSYMS
 874 .tmp_vmlinux1: vmlinux.o
 875 endif
 876
 877 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 878 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 879         $(call if_changed_rule,vmlinux-modpost)
 880
 881 # The actual objects are generated when descending,
 882 # make sure no implicit rule kicks in
 883 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 884
 885 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 886 # Preset locale variables to speed up the build process. Limit locale
 887 # tweaks to this spot to avoid wrong language settings when running
 888 # make menuconfig etc.
 889 # Error messages still appears in the original language
 890
 891 PHONY += $(vmlinux-dirs)
 892 $(vmlinux-dirs): prepare scripts
 893         $(Q)$(MAKE) $(build)=$@
 894
 895 # Store (new) KERNELRELASE string in include/config/kernel.release
 896 include/config/kernel.release: include/config/auto.conf FORCE
 897         $(Q)rm -f $@
 898         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 899
 900
 901 # Things we need to do before we recursively start building the kernel
 902 # or the modules are listed in "prepare".
 903 # A multi level approach is used. prepareN is processed before prepareN-1.
 904 # archprepare is used in arch Makefiles and when processed asm symlink,
 905 # version.h and scripts_basic is processed / created.
 906
 907 # Listed in dependency order
 908 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 909
 910 # prepare3 is used to check if we are building in a separate output directory,
 911 # and if so do:
 912 # 1) Check that make has not been executed in the kernel src $(srctree)
 913 prepare3: include/config/kernel.release
 914 ifneq ($(KBUILD_SRC),)
 915         @$(kecho) '  Using $(srctree) as source for kernel'
 916         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 917                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 918                 echo "  in the '$(srctree)' directory.";\
 919                 /bin/false; \
 920         fi;
 921 endif
 922
 923 # prepare2 creates a makefile if using a separate output directory
 924 prepare2: prepare3 outputmakefile
 925
 926 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 927                    include/config/auto.conf
 928         $(cmd_crmodverdir)
 929
 930 archprepare: prepare1 scripts_basic
 931
 932 prepare0: archprepare FORCE
 933         $(Q)$(MAKE) $(build)=.
 934         $(Q)$(MAKE) $(build)=. missing-syscalls
 935
 936 # All the preparing..
 937 prepare: prepare0
 938
 939 # Generate some files
 940 # ---------------------------------------------------------------------------
 941
 942 # KERNELRELEASE can change from a few different places, meaning version.h
 943 # needs to be updated, so this check is forced on all builds
 944
 945 uts_len := 64
 946 define filechk_utsrelease.h
 947         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 948           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 949           exit 1;                                                         \
 950         fi;                                                               \
 951         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 952 endef
 953
 954 define filechk_version.h
 955         (echo \#define LINUX_VERSION_CODE $(shell                             \
 956         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 957         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 958 endef
 959
 960 include/linux/version.h: $(srctree)/Makefile FORCE
 961         $(call filechk,version.h)
 962
 963 include/generated/utsrelease.h: include/config/kernel.release FORCE
 964         $(call filechk,utsrelease.h)
 965
 966 PHONY += headerdep
 967 headerdep:
 968         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
 969
 970 # ---------------------------------------------------------------------------
 971
 972 PHONY += depend dep
 973 depend dep:
 974         @echo '*** Warning: make $@ is unnecessary now.'
 975
 976 # ---------------------------------------------------------------------------
 977 # Firmware install
 978 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 979 export INSTALL_FW_PATH
 980
 981 PHONY += firmware_install
 982 firmware_install: FORCE
 983         @mkdir -p $(objtree)/firmware
 984         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 985
 986 # ---------------------------------------------------------------------------
 987 # Kernel headers
 988
 989 #Default location for installed headers
 990 export INSTALL_HDR_PATH = $(objtree)/usr
 991
 992 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 993
 994 # If we do an all arch process set dst to asm-$(hdr-arch)
 995 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 996
 997 PHONY += __headers
 998 __headers: include/linux/version.h scripts_basic FORCE
 999         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1000
1001 PHONY += headers_install_all
1002 headers_install_all:
1003         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1004
1005 PHONY += headers_install
1006 headers_install: __headers
1007         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1008         $(error Headers not exportable for the $(SRCARCH) architecture))
1009         $(Q)$(MAKE) $(hdr-inst)=include
1010         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1011
1012 PHONY += headers_check_all
1013 headers_check_all: headers_install_all
1014         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1015
1016 PHONY += headers_check
1017 headers_check: headers_install
1018         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1019         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1020
1021 # ---------------------------------------------------------------------------
1022 # Modules
1023
1024 ifdef CONFIG_MODULES
1025
1026 # By default, build modules as well
1027
1028 all: modules
1029
1030 #       Build modules
1031 #
1032 #       A module can be listed more than once in obj-m resulting in
1033 #       duplicate lines in modules.order files.  Those are removed
1034 #       using awk while concatenating to the final file.
1035
1036 PHONY += modules
1037 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1038         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1039         @$(kecho) '  Building modules, stage 2.';
1040         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1041         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1042
1043 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1044         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1045
1046 %/modules.builtin: include/config/auto.conf
1047         $(Q)$(MAKE) $(modbuiltin)=$*
1048
1049
1050 # Target to prepare building external modules
1051 PHONY += modules_prepare
1052 modules_prepare: prepare scripts
1053
1054 # Target to install modules
1055 PHONY += modules_install
1056 modules_install: _modinst_ _modinst_post
1057
1058 PHONY += _modinst_
1059 _modinst_:
1060         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1061                 echo "Warning: you may need to install module-init-tools"; \
1062                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1063                 sleep 1; \
1064         fi
1065         @rm -rf $(MODLIB)/kernel
1066         @rm -f $(MODLIB)/source
1067         @mkdir -p $(MODLIB)/kernel
1068         @ln -s $(srctree) $(MODLIB)/source
1069         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1070                 rm -f $(MODLIB)/build ; \
1071                 ln -s $(objtree) $(MODLIB)/build ; \
1072         fi
1073         @cp -f $(objtree)/modules.order $(MODLIB)/
1074         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1075         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1076
1077 # This depmod is only for convenience to give the initial
1078 # boot a modules.dep even before / is mounted read-write.  However the
1079 # boot script depmod is the master version.
1080 PHONY += _modinst_post
1081 _modinst_post: _modinst_
1082         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1083         $(call cmd,depmod)
1084
1085 else # CONFIG_MODULES
1086
1087 # Modules not configured
1088 # ---------------------------------------------------------------------------
1089
1090 modules modules_install: FORCE
1091         @echo
1092         @echo "The present kernel configuration has modules disabled."
1093         @echo "Type 'make config' and enable loadable module support."
1094         @echo "Then build a kernel with module support enabled."
1095         @echo
1096         @exit 1
1097
1098 endif # CONFIG_MODULES
1099
1100 ###
1101 # Cleaning is done on three levels.
1102 # make clean     Delete most generated files
1103 #                Leave enough to build external modules
1104 # make mrproper  Delete the current configuration, and all generated files
1105 # make distclean Remove editor backup files, patch leftover files and the like
1106
1107 # Directories & files removed with 'make clean'
1108 CLEAN_DIRS  += $(MODVERDIR)
1109 CLEAN_FILES +=  vmlinux System.map \
1110                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1111
1112 # Directories & files removed with 'make mrproper'
1113 MRPROPER_DIRS  += include/config usr/include include/generated
1114 MRPROPER_FILES += .config .config.old .version .old_version             \
1115                   include/linux/version.h                               \
1116                   Module.symvers tags TAGS cscope*
1117
1118 # clean - Delete most, but leave enough to build external modules
1119 #
1120 clean: rm-dirs  := $(CLEAN_DIRS)
1121 clean: rm-files := $(CLEAN_FILES)
1122 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1123
1124 PHONY += $(clean-dirs) clean archclean
1125 $(clean-dirs):
1126         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1127
1128 clean: archclean $(clean-dirs)
1129         $(call cmd,rmdirs)
1130         $(call cmd,rmfiles)
1131         @find . $(RCS_FIND_IGNORE) \
1132                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1133                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1134                 -o -name '*.symtypes' -o -name 'modules.order' \
1135                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1136                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1137
1138 # mrproper - Delete all generated files, including .config
1139 #
1140 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1141 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1142 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1143
1144 PHONY += $(mrproper-dirs) mrproper archmrproper
1145 $(mrproper-dirs):
1146         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1147
1148 mrproper: clean archmrproper $(mrproper-dirs)
1149         $(call cmd,rmdirs)
1150         $(call cmd,rmfiles)
1151
1152 # distclean
1153 #
1154 PHONY += distclean
1155
1156 distclean: mrproper
1157         @find $(srctree) $(RCS_FIND_IGNORE) \
1158                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1159                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1160                 -o -name '.*.rej' -o -size 0 \
1161                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1162                 -type f -print | xargs rm -f
1163
1164
1165 # Packaging of the kernel to various formats
1166 # ---------------------------------------------------------------------------
1167 # rpm target kept for backward compatibility
1168 package-dir     := $(srctree)/scripts/package
1169
1170 %src-pkg: FORCE
1171         $(Q)$(MAKE) $(build)=$(package-dir) $@
1172 %pkg: include/config/kernel.release FORCE
1173         $(Q)$(MAKE) $(build)=$(package-dir) $@
1174 rpm: include/config/kernel.release FORCE
1175         $(Q)$(MAKE) $(build)=$(package-dir) $@
1176
1177
1178 # Brief documentation of the typical targets used
1179 # ---------------------------------------------------------------------------
1180
1181 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1182 boards := $(notdir $(boards))
1183 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1184 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1185
1186 help:
1187         @echo  'Cleaning targets:'
1188         @echo  '  clean           - Remove most generated files but keep the config and'
1189         @echo  '                    enough build support to build external modules'
1190         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1191         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1192         @echo  ''
1193         @echo  'Configuration targets:'
1194         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1195         @echo  ''
1196         @echo  'Other generic targets:'
1197         @echo  '  all             - Build all targets marked with [*]'
1198         @echo  '* vmlinux         - Build the bare kernel'
1199         @echo  '* modules         - Build all modules'
1200         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1201         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1202         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1203         @echo  '  dir/            - Build all files in dir and below'
1204         @echo  '  dir/file.[oisS] - Build specified target only'
1205         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1206         @echo  '                    (requires a recent binutils and recent build (System.map))'
1207         @echo  '  dir/file.ko     - Build module including final link'
1208         @echo  '  modules_prepare - Set up for building external modules'
1209         @echo  '  tags/TAGS       - Generate tags file for editors'
1210         @echo  '  cscope          - Generate cscope index'
1211         @echo  '  kernelrelease   - Output the release version string'
1212         @echo  '  kernelversion   - Output the version stored in Makefile'
1213         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1214          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1215          echo  ''
1216         @echo  'Static analysers'
1217         @echo  '  checkstack      - Generate a list of stack hogs'
1218         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1219         @echo  '  versioncheck    - Sanity check on version.h usage'
1220         @echo  '  includecheck    - Check for duplicate included header files'
1221         @echo  '  export_report   - List the usages of all exported symbols'
1222         @echo  '  headers_check   - Sanity check on exported headers'
1223         @echo  '  headerdep       - Detect inclusion cycles in headers'
1224         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1225         @echo  ''
1226         @echo  'Kernel packaging:'
1227         @$(MAKE) $(build)=$(package-dir) help
1228         @echo  ''
1229         @echo  'Documentation targets:'
1230         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1231         @echo  ''
1232         @echo  'Architecture specific targets ($(SRCARCH)):'
1233         @$(if $(archhelp),$(archhelp),\
1234                 echo '  No architecture specific help defined for $(SRCARCH)')
1235         @echo  ''
1236         @$(if $(boards), \
1237                 $(foreach b, $(boards), \
1238                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1239                 echo '')
1240         @$(if $(board-dirs), \
1241                 $(foreach b, $(board-dirs), \
1242                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1243                 printf "  %-16s - Show all of the above\\n" help-boards; \
1244                 echo '')
1245
1246         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1247         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1248         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1249         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1250         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1251         @echo  ''
1252         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1253         @echo  'For further info see the ./README file'
1254
1255
1256 help-board-dirs := $(addprefix help-,$(board-dirs))
1257
1258 help-boards: $(help-board-dirs)
1259
1260 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1261
1262 $(help-board-dirs): help-%:
1263         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1264         @$(if $(boards-per-dir), \
1265                 $(foreach b, $(boards-per-dir), \
1266                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1267                 echo '')
1268
1269
1270 # Documentation targets
1271 # ---------------------------------------------------------------------------
1272 %docs: scripts_basic FORCE
1273         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1274
1275 else # KBUILD_EXTMOD
1276
1277 ###
1278 # External module support.
1279 # When building external modules the kernel used as basis is considered
1280 # read-only, and no consistency checks are made and the make
1281 # system is not used on the basis kernel. If updates are required
1282 # in the basis kernel ordinary make commands (without M=...) must
1283 # be used.
1284 #
1285 # The following are the only valid targets when building external
1286 # modules.
1287 # make M=dir clean     Delete all automatically generated files
1288 # make M=dir modules   Make all modules in specified dir
1289 # make M=dir           Same as 'make M=dir modules'
1290 # make M=dir modules_install
1291 #                      Install the modules built in the module directory
1292 #                      Assumes install directory is already created
1293
1294 # We are always building modules
1295 KBUILD_MODULES := 1
1296 PHONY += crmodverdir
1297 crmodverdir:
1298         $(cmd_crmodverdir)
1299
1300 PHONY += $(objtree)/Module.symvers
1301 $(objtree)/Module.symvers:
1302         @test -e $(objtree)/Module.symvers || ( \
1303         echo; \
1304         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1305         echo "           is missing; modules will have no dependencies and modversions."; \
1306         echo )
1307
1308 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1309 PHONY += $(module-dirs) modules
1310 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1311         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1312
1313 modules: $(module-dirs)
1314         @$(kecho) '  Building modules, stage 2.';
1315         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1316
1317 PHONY += modules_install
1318 modules_install: _emodinst_ _emodinst_post
1319
1320 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1321 PHONY += _emodinst_
1322 _emodinst_:
1323         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1324         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1325
1326 PHONY += _emodinst_post
1327 _emodinst_post: _emodinst_
1328         $(call cmd,depmod)
1329
1330 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1331
1332 PHONY += $(clean-dirs) clean
1333 $(clean-dirs):
1334         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1335
1336 clean:  rm-dirs := $(MODVERDIR)
1337 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1338                    $(KBUILD_EXTMOD)/modules.order \
1339                    $(KBUILD_EXTMOD)/modules.builtin
1340 clean: $(clean-dirs)
1341         $(call cmd,rmdirs)
1342         $(call cmd,rmfiles)
1343         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1344                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1345                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1346                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1347
1348 help:
1349         @echo  '  Building external modules.'
1350         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1351         @echo  ''
1352         @echo  '  modules         - default target, build the module(s)'
1353         @echo  '  modules_install - install the module'
1354         @echo  '  clean           - remove generated files in module directory only'
1355         @echo  ''
1356
1357 # Dummies...
1358 PHONY += prepare scripts
1359 prepare: ;
1360 scripts: ;
1361 endif # KBUILD_EXTMOD
1362
1363 # Generate tags for editors
1364 # ---------------------------------------------------------------------------
1365 quiet_cmd_tags = GEN     $@
1366       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1367
1368 tags TAGS cscope: FORCE
1369         $(call cmd,tags)
1370
1371 # Scripts to check various things for consistency
1372 # ---------------------------------------------------------------------------
1373
1374 includecheck:
1375         find * $(RCS_FIND_IGNORE) \
1376                 -name '*.[hcS]' -type f -print | sort \
1377                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1378
1379 versioncheck:
1380         find * $(RCS_FIND_IGNORE) \
1381                 -name '*.[hcS]' -type f -print | sort \
1382                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1383
1384 coccicheck:
1385         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1386
1387 namespacecheck:
1388         $(PERL) $(srctree)/scripts/namespace.pl
1389
1390 export_report:
1391         $(PERL) $(srctree)/scripts/export_report.pl
1392
1393 endif #ifeq ($(config-targets),1)
1394 endif #ifeq ($(mixed-targets),1)
1395
1396 PHONY += checkstack kernelrelease kernelversion
1397
1398 # UML needs a little special treatment here.  It wants to use the host
1399 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1400 # else wants $(ARCH), including people doing cross-builds, which means
1401 # that $(SUBARCH) doesn't work here.
1402 ifeq ($(ARCH), um)
1403 CHECKSTACK_ARCH := $(SUBARCH)
1404 else
1405 CHECKSTACK_ARCH := $(ARCH)
1406 endif
1407 checkstack:
1408         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1409         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1410
1411 kernelrelease:
1412         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1413
1414 kernelversion:
1415         @echo $(KERNELVERSION)
1416
1417 # Single targets
1418 # ---------------------------------------------------------------------------
1419 # Single targets are compatible with:
1420 # - build with mixed source and output
1421 # - build with separate output dir 'make O=...'
1422 # - external modules
1423 #
1424 #  target-dir => where to store outputfile
1425 #  build-dir  => directory in kernel source tree to use
1426
1427 ifeq ($(KBUILD_EXTMOD),)
1428         build-dir  = $(patsubst %/,%,$(dir $@))
1429         target-dir = $(dir $@)
1430 else
1431         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1432         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1433         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1434 endif
1435
1436 %.s: %.c prepare scripts FORCE
1437         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1438 %.i: %.c prepare scripts FORCE
1439         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1440 %.o: %.c prepare scripts FORCE
1441         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1442 %.lst: %.c prepare scripts FORCE
1443         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1444 %.s: %.S prepare scripts FORCE
1445         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1446 %.o: %.S prepare scripts FORCE
1447         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1448 %.symtypes: %.c prepare scripts FORCE
1449         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1450
1451 # Modules
1452 /: prepare scripts FORCE
1453         $(cmd_crmodverdir)
1454         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1455         $(build)=$(build-dir)
1456 %/: prepare scripts FORCE
1457         $(cmd_crmodverdir)
1458         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1459         $(build)=$(build-dir)
1460 %.ko: prepare scripts FORCE
1461         $(cmd_crmodverdir)
1462         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1463         $(build)=$(build-dir) $(@:.ko=.o)
1464         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1465
1466 # FIXME Should go into a make.lib or something
1467 # ===========================================================================
1468
1469 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1470       cmd_rmdirs = rm -rf $(rm-dirs)
1471
1472 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1473       cmd_rmfiles = rm -f $(rm-files)
1474
1475 # Run depmod only if we have System.map and depmod is executable
1476 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1477       cmd_depmod = \
1478         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1479                 $(DEPMOD) -ae -F System.map                                     \
1480                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1481                 $(KERNELRELEASE);                                               \
1482         fi
1483
1484 # Create temporary dir for module support files
1485 # clean it up only when building all modules
1486 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1487                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1488
1489 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1490           $(KBUILD_AFLAGS_KERNEL)                              \
1491           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1492           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1493
1494 quiet_cmd_as_o_S = AS      $@
1495 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1496
1497 # read all saved command lines
1498
1499 targets := $(wildcard $(sort $(targets)))
1500 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1501
1502 ifneq ($(cmd_files),)
1503   $(cmd_files): ;       # Do not try to update included dependency files
1504   include $(cmd_files)
1505 endif
1506
1507 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1508 # Usage:
1509 # $(Q)$(MAKE) $(clean)=dir
1510 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1511
1512 endif   # skip-makefile
1513
1514 PHONY += FORCE
1515 FORCE:
1516
1517 # Declare the contents of the .PHONY variable as phony.  We keep that
1518 # information in a variable so we can use it in if_changed and friends.
1519 .PHONY: $(PHONY)