Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 39
   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 := $(O)
 103 endif
 104
 105 ifeq ("$(origin W)", "command line")
 106   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := 1
 107 endif
 108
 109 # That's our default target when none is given on the command line
 110 PHONY := _all
 111 _all:
 112
 113 # Cancel implicit rules on top Makefile
 114 $(CURDIR)/Makefile Makefile: ;
 115
 116 ifneq ($(KBUILD_OUTPUT),)
 117 # Invoke a second make in the output directory, passing relevant variables
 118 # check that the output directory actually exists
 119 saved-output := $(KBUILD_OUTPUT)
 120 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 121 $(if $(KBUILD_OUTPUT),, \
 122      $(error output directory "$(saved-output)" does not exist))
 123
 124 PHONY += $(MAKECMDGOALS) sub-make
 125
 126 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 127         $(Q)@:
 128
 129 sub-make: FORCE
 130         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 131         KBUILD_SRC=$(CURDIR) \
 132         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 133         $(filter-out _all sub-make,$(MAKECMDGOALS))
 134
 135 # Leave processing to above invocation of make
 136 skip-makefile := 1
 137 endif # ifneq ($(KBUILD_OUTPUT),)
 138 endif # ifeq ($(KBUILD_SRC),)
 139
 140 # We process the rest of the Makefile if this is the final invocation of make
 141 ifeq ($(skip-makefile),)
 142
 143 # If building an external module we do not care about the all: rule
 144 # but instead _all depend on modules
 145 PHONY += all
 146 ifeq ($(KBUILD_EXTMOD),)
 147 _all: all
 148 else
 149 _all: modules
 150 endif
 151
 152 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 153 objtree         := $(CURDIR)
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH
 160
 161
 162 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 163 # first, and if a usermode build is happening, the "ARCH=um" on the command
 164 # line overrides the setting of ARCH below.  If a native build is happening,
 165 # then ARCH is assigned, getting whatever value it gets normally, and
 166 # SUBARCH is subsequently ignored.
 167
 168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                   -e s/sh[234].*/sh/ )
 173
 174 # Cross compiling and selecting different set of gcc/bin-utils
 175 # ---------------------------------------------------------------------------
 176 #
 177 # When performing cross compilation for other architectures ARCH shall be set
 178 # to the target architecture. (See arch/* for the possibilities).
 179 # ARCH can be set during invocation of make:
 180 # make ARCH=ia64
 181 # Another way is to have ARCH set in the environment.
 182 # The default ARCH is the host where make is executed.
 183
 184 # CROSS_COMPILE specify the prefix used for all executables used
 185 # during compilation. Only gcc and related bin-utils executables
 186 # are prefixed with $(CROSS_COMPILE).
 187 # CROSS_COMPILE can be set on the command line
 188 # make CROSS_COMPILE=ia64-linux-
 189 # Alternatively CROSS_COMPILE can be set in the environment.
 190 # A third alternative is to store a setting in .config so that plain
 191 # "make" in the configured kernel build directory always uses that.
 192 # Default value for CROSS_COMPILE is not to prefix executables
 193 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 194 export KBUILD_BUILDHOST := $(SUBARCH)
 195 ARCH            ?= $(SUBARCH)
 196 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 197
 198 # Architecture as present in compile.h
 199 UTS_MACHINE     := $(ARCH)
 200 SRCARCH         := $(ARCH)
 201
 202 # Additional ARCH settings for x86
 203 ifeq ($(ARCH),i386)
 204         SRCARCH := x86
 205 endif
 206 ifeq ($(ARCH),x86_64)
 207         SRCARCH := x86
 208 endif
 209
 210 # Additional ARCH settings for sparc
 211 ifeq ($(ARCH),sparc32)
 212        SRCARCH := sparc
 213 endif
 214 ifeq ($(ARCH),sparc64)
 215        SRCARCH := sparc
 216 endif
 217
 218 # Additional ARCH settings for sh
 219 ifeq ($(ARCH),sh64)
 220        SRCARCH := sh
 221 endif
 222
 223 # Additional ARCH settings for tile
 224 ifeq ($(ARCH),tilepro)
 225        SRCARCH := tile
 226 endif
 227 ifeq ($(ARCH),tilegx)
 228        SRCARCH := tile
 229 endif
 230
 231 # Where to locate arch specific headers
 232 hdr-arch  := $(SRCARCH)
 233
 234 ifeq ($(ARCH),m68knommu)
 235        hdr-arch  := m68k
 236 endif
 237
 238 KCONFIG_CONFIG  ?= .config
 239 export KCONFIG_CONFIG
 240
 241 # SHELL used by kbuild
 242 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 243           else if [ -x /bin/bash ]; then echo /bin/bash; \
 244           else echo sh; fi ; fi)
 245
 246 HOSTCC       = gcc
 247 HOSTCXX      = g++
 248 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 249 HOSTCXXFLAGS = -O2
 250
 251 # Decide whether to build built-in, modular, or both.
 252 # Normally, just do built-in.
 253
 254 KBUILD_MODULES :=
 255 KBUILD_BUILTIN := 1
 256
 257 #       If we have only "make modules", don't compile built-in objects.
 258 #       When we're building modules with modversions, we need to consider
 259 #       the built-in objects during the descend as well, in order to
 260 #       make sure the checksums are up to date before we record them.
 261
 262 ifeq ($(MAKECMDGOALS),modules)
 263   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 264 endif
 265
 266 #       If we have "make <whatever> modules", compile modules
 267 #       in addition to whatever we do anyway.
 268 #       Just "make" or "make all" shall build modules as well
 269
 270 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 271   KBUILD_MODULES := 1
 272 endif
 273
 274 ifeq ($(MAKECMDGOALS),)
 275   KBUILD_MODULES := 1
 276 endif
 277
 278 export KBUILD_MODULES KBUILD_BUILTIN
 279 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 280
 281 # Beautify output
 282 # ---------------------------------------------------------------------------
 283 #
 284 # Normally, we echo the whole command before executing it. By making
 285 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 286 # $(quiet) to choose other forms of output instead, e.g.
 287 #
 288 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 289 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 290 #
 291 # If $(quiet) is empty, the whole command will be printed.
 292 # If it is set to "quiet_", only the short version will be printed.
 293 # If it is set to "silent_", nothing will be printed at all, since
 294 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 295 #
 296 # A simple variant is to prefix commands with $(Q) - that's useful
 297 # for commands that shall be hidden in non-verbose mode.
 298 #
 299 #       $(Q)ln $@ :<
 300 #
 301 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 302 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 303
 304 ifeq ($(KBUILD_VERBOSE),1)
 305   quiet =
 306   Q =
 307 else
 308   quiet=quiet_
 309   Q = @
 310 endif
 311
 312 # If the user is running make -s (silent mode), suppress echoing of
 313 # commands
 314
 315 ifneq ($(findstring s,$(MAKEFLAGS)),)
 316   quiet=silent_
 317 endif
 318
 319 export quiet Q KBUILD_VERBOSE
 320
 321
 322 # Look for make include files relative to root of kernel src
 323 MAKEFLAGS += --include-dir=$(srctree)
 324
 325 # We need some generic definitions (do not try to remake the file).
 326 $(srctree)/scripts/Kbuild.include: ;
 327 include $(srctree)/scripts/Kbuild.include
 328
 329 # Make variables (CC, etc...)
 330
 331 AS              = $(CROSS_COMPILE)as
 332 LD              = $(CROSS_COMPILE)ld
 333 CC              = $(CROSS_COMPILE)gcc
 334 CPP             = $(CC) -E
 335 AR              = $(CROSS_COMPILE)ar
 336 NM              = $(CROSS_COMPILE)nm
 337 STRIP           = $(CROSS_COMPILE)strip
 338 OBJCOPY         = $(CROSS_COMPILE)objcopy
 339 OBJDUMP         = $(CROSS_COMPILE)objdump
 340 AWK             = awk
 341 GENKSYMS        = scripts/genksyms/genksyms
 342 INSTALLKERNEL  := installkernel
 343 DEPMOD          = /sbin/depmod
 344 KALLSYMS        = scripts/kallsyms
 345 PERL            = perl
 346 CHECK           = sparse
 347
 348 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 349                   -Wbitwise -Wno-return-void $(CF)
 350 CFLAGS_MODULE   =
 351 AFLAGS_MODULE   =
 352 LDFLAGS_MODULE  =
 353 CFLAGS_KERNEL   =
 354 AFLAGS_KERNEL   =
 355 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 356
 357
 358 # Use LINUXINCLUDE when you must reference the include/ directory.
 359 # Needed to be compatible with the O= option
 360 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 361                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 362                    -include include/generated/autoconf.h
 363
 364 KBUILD_CPPFLAGS := -D__KERNEL__
 365
 366 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 367                    -fno-strict-aliasing -fno-common \
 368                    -Werror-implicit-function-declaration \
 369                    -Wno-format-security \
 370                    -fno-delete-null-pointer-checks
 371 KBUILD_AFLAGS_KERNEL :=
 372 KBUILD_CFLAGS_KERNEL :=
 373 KBUILD_AFLAGS   := -D__ASSEMBLY__
 374 KBUILD_AFLAGS_MODULE  := -DMODULE
 375 KBUILD_CFLAGS_MODULE  := -DMODULE
 376 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 377
 378 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 379 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 380 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 381
 382 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 383 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 384 export CPP AR NM STRIP OBJCOPY OBJDUMP
 385 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 386 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 387
 388 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 389 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 390 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 391 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 392 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 393
 394 # When compiling out-of-tree modules, put MODVERDIR in the module
 395 # tree rather than in the kernel tree. The kernel tree might
 396 # even be read-only.
 397 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 398
 399 # Files to ignore in find ... statements
 400
 401 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
 402 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 403
 404 # ===========================================================================
 405 # Rules shared between *config targets and build targets
 406
 407 # Basic helpers built in scripts/
 408 PHONY += scripts_basic
 409 scripts_basic:
 410         $(Q)$(MAKE) $(build)=scripts/basic
 411         $(Q)rm -f .tmp_quiet_recordmcount
 412
 413 # To avoid any implicit rule to kick in, define an empty command.
 414 scripts/basic/%: scripts_basic ;
 415
 416 PHONY += outputmakefile
 417 # outputmakefile generates a Makefile in the output directory, if using a
 418 # separate output directory. This allows convenient use of make in the
 419 # output directory.
 420 outputmakefile:
 421 ifneq ($(KBUILD_SRC),)
 422         $(Q)ln -fsn $(srctree) source
 423         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 424             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 425 endif
 426
 427 # To make sure we do not include .config for any of the *config targets
 428 # catch them early, and hand them over to scripts/kconfig/Makefile
 429 # It is allowed to specify more targets when calling make, including
 430 # mixing *config targets and build targets.
 431 # For example 'make oldconfig all'.
 432 # Detect when mixed targets is specified, and make a second invocation
 433 # of make so .config is not included in this case either (for *config).
 434
 435 no-dot-config-targets := clean mrproper distclean \
 436                          cscope gtags TAGS tags help %docs check% coccicheck \
 437                          include/linux/version.h headers_% \
 438                          kernelversion %src-pkg
 439
 440 config-targets := 0
 441 mixed-targets  := 0
 442 dot-config     := 1
 443
 444 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 445         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 446                 dot-config := 0
 447         endif
 448 endif
 449
 450 ifeq ($(KBUILD_EXTMOD),)
 451         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 452                 config-targets := 1
 453                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 454                         mixed-targets := 1
 455                 endif
 456         endif
 457 endif
 458
 459 ifeq ($(mixed-targets),1)
 460 # ===========================================================================
 461 # We're called with mixed targets (*config and build targets).
 462 # Handle them one by one.
 463
 464 %:: FORCE
 465         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 466
 467 else
 468 ifeq ($(config-targets),1)
 469 # ===========================================================================
 470 # *config targets only - make sure prerequisites are updated, and descend
 471 # in scripts/kconfig to make the *config target
 472
 473 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 474 # KBUILD_DEFCONFIG may point out an alternative default configuration
 475 # used for 'make defconfig'
 476 include $(srctree)/arch/$(SRCARCH)/Makefile
 477 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 478
 479 config: scripts_basic outputmakefile FORCE
 480         $(Q)mkdir -p include/linux include/config
 481         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 482
 483 %config: scripts_basic outputmakefile FORCE
 484         $(Q)mkdir -p include/linux include/config
 485         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 486
 487 else
 488 # ===========================================================================
 489 # Build targets only - this includes vmlinux, arch specific targets, clean
 490 # targets and others. In general all targets except *config targets.
 491
 492 ifeq ($(KBUILD_EXTMOD),)
 493 # Additional helpers built in scripts/
 494 # Carefully list dependencies so we do not try to build scripts twice
 495 # in parallel
 496 PHONY += scripts
 497 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 498         $(Q)$(MAKE) $(build)=$(@)
 499
 500 # Objects we will link into vmlinux / subdirs we need to visit
 501 init-y          := init/
 502 drivers-y       := drivers/ sound/ firmware/
 503 net-y           := net/
 504 libs-y          := lib/
 505 core-y          := usr/
 506 endif # KBUILD_EXTMOD
 507
 508 ifeq ($(dot-config),1)
 509 # Read in config
 510 -include include/config/auto.conf
 511
 512 ifeq ($(KBUILD_EXTMOD),)
 513 # Read in dependencies to all Kconfig* files, make sure to run
 514 # oldconfig if changes are detected.
 515 -include include/config/auto.conf.cmd
 516
 517 # To avoid any implicit rule to kick in, define an empty command
 518 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 519
 520 # If .config is newer than include/config/auto.conf, someone tinkered
 521 # with it and forgot to run make oldconfig.
 522 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 523 # we execute the config step to be sure to catch updated Kconfig files
 524 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 525         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 526 else
 527 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 528 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 529 PHONY += include/config/auto.conf
 530
 531 include/config/auto.conf:
 532         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 533         echo;                                                           \
 534         echo "  ERROR: Kernel configuration is invalid.";               \
 535         echo "         include/generated/autoconf.h or $@ are missing.";\
 536         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 537         echo;                                                           \
 538         /bin/false)
 539
 540 endif # KBUILD_EXTMOD
 541
 542 else
 543 # Dummy target needed, because used as prerequisite
 544 include/config/auto.conf: ;
 545 endif # $(dot-config)
 546
 547 # The all: target is the default when no target is given on the
 548 # command line.
 549 # This allow a user to issue only 'make' to build a kernel including modules
 550 # Defaults to vmlinux, but the arch makefile usually adds further targets
 551 all: vmlinux
 552
 553 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 554 KBUILD_CFLAGS   += -Os
 555 else
 556 KBUILD_CFLAGS   += -O2
 557 endif
 558
 559 include $(srctree)/arch/$(SRCARCH)/Makefile
 560
 561 ifneq ($(CONFIG_FRAME_WARN),0)
 562 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 563 endif
 564
 565 # Force gcc to behave correct even for buggy distributions
 566 ifndef CONFIG_CC_STACKPROTECTOR
 567 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 568 endif
 569
 570 ifdef CONFIG_FRAME_POINTER
 571 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 572 else
 573 # Some targets (ARM with Thumb2, for example), can't be built with frame
 574 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 575 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 576 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 577 # -fomit-frame-pointer with FUNCTION_TRACER.
 578 ifndef CONFIG_FUNCTION_TRACER
 579 KBUILD_CFLAGS   += -fomit-frame-pointer
 580 endif
 581 endif
 582
 583 ifdef CONFIG_DEBUG_INFO
 584 KBUILD_CFLAGS   += -g
 585 KBUILD_AFLAGS   += -gdwarf-2
 586 endif
 587
 588 ifdef CONFIG_DEBUG_INFO_REDUCED
 589 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 590 endif
 591
 592 ifdef CONFIG_FUNCTION_TRACER
 593 KBUILD_CFLAGS   += -pg
 594 ifdef CONFIG_DYNAMIC_FTRACE
 595         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 596                 BUILD_C_RECORDMCOUNT := y
 597                 export BUILD_C_RECORDMCOUNT
 598         endif
 599 endif
 600 endif
 601
 602 # We trigger additional mismatches with less inlining
 603 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 604 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 605 endif
 606
 607 # arch Makefile may override CC so keep this after arch Makefile is included
 608 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 609 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 610
 611 # warn about C99 declaration after statement
 612 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 613
 614 # disable pointer signed / unsigned warnings in gcc 4.0
 615 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 616
 617 # disable invalid "can't wrap" optimizations for signed / pointers
 618 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 619
 620 # conserve stack if available
 621 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 622
 623 # check for 'asm goto'
 624 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 625         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 626 endif
 627
 628 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 629 # But warn user when we do so
 630 warn-assign = \
 631 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 632
 633 ifneq ($(KCPPFLAGS),)
 634         $(call warn-assign,CPPFLAGS)
 635         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 636 endif
 637 ifneq ($(KAFLAGS),)
 638         $(call warn-assign,AFLAGS)
 639         KBUILD_AFLAGS += $(KAFLAGS)
 640 endif
 641 ifneq ($(KCFLAGS),)
 642         $(call warn-assign,CFLAGS)
 643         KBUILD_CFLAGS += $(KCFLAGS)
 644 endif
 645
 646 # Use --build-id when available.
 647 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 648                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 649 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 650 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 651
 652 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 653 LDFLAGS_vmlinux += $(call ld-option, -X,)
 654 endif
 655
 656 # Default kernel image to build when no specific target is given.
 657 # KBUILD_IMAGE may be overruled on the command line or
 658 # set in the environment
 659 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 660 # this default value
 661 export KBUILD_IMAGE ?= vmlinux
 662
 663 #
 664 # INSTALL_PATH specifies where to place the updated kernel and system map
 665 # images. Default is /boot, but you can set it to other values
 666 export  INSTALL_PATH ?= /boot
 667
 668 #
 669 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 670 # relocations required by build roots.  This is not defined in the
 671 # makefile but the argument can be passed to make if needed.
 672 #
 673
 674 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 675 export MODLIB
 676
 677 #
 678 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 679 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 680 #  the default option --strip-debug will be used.  Otherwise,
 681 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 682
 683 ifdef INSTALL_MOD_STRIP
 684 ifeq ($(INSTALL_MOD_STRIP),1)
 685 mod_strip_cmd = $(STRIP) --strip-debug
 686 else
 687 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 688 endif # INSTALL_MOD_STRIP=1
 689 else
 690 mod_strip_cmd = true
 691 endif # INSTALL_MOD_STRIP
 692 export mod_strip_cmd
 693
 694
 695 ifeq ($(KBUILD_EXTMOD),)
 696 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 697
 698 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 699                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 700                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 701
 702 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 703                      $(init-n) $(init-) \
 704                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 705                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 706
 707 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 708 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 709 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 710 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 711 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 712 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 713 libs-y          := $(libs-y1) $(libs-y2)
 714
 715 # Build vmlinux
 716 # ---------------------------------------------------------------------------
 717 # vmlinux is built from the objects selected by $(vmlinux-init) and
 718 # $(vmlinux-main). Most are built-in.o files from top-level directories
 719 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 720 # Ordering when linking is important, and $(vmlinux-init) must be first.
 721 #
 722 # vmlinux
 723 #   ^
 724 #   |
 725 #   +-< $(vmlinux-init)
 726 #   |   +--< init/version.o + more
 727 #   |
 728 #   +--< $(vmlinux-main)
 729 #   |    +--< driver/built-in.o mm/built-in.o + more
 730 #   |
 731 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 732 #
 733 # vmlinux version (uname -v) cannot be updated during normal
 734 # descending-into-subdirs phase since we do not yet know if we need to
 735 # update vmlinux.
 736 # Therefore this step is delayed until just before final link of vmlinux -
 737 # except in the kallsyms case where it is done just before adding the
 738 # symbols to the kernel.
 739 #
 740 # System.map is generated to document addresses of all kernel symbols
 741
 742 vmlinux-init := $(head-y) $(init-y)
 743 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 744 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 745 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 746 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 747
 748 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 749 # May be overridden by arch/$(ARCH)/Makefile
 750 quiet_cmd_vmlinux__ ?= LD      $@
 751       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 752       -T $(vmlinux-lds) $(vmlinux-init)                          \
 753       --start-group $(vmlinux-main) --end-group                  \
 754       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 755
 756 # Generate new vmlinux version
 757 quiet_cmd_vmlinux_version = GEN     .version
 758       cmd_vmlinux_version = set -e;                     \
 759         if [ ! -r .version ]; then                      \
 760           rm -f .version;                               \
 761           echo 1 >.version;                             \
 762         else                                            \
 763           mv .version .old_version;                     \
 764           expr 0$$(cat .old_version) + 1 >.version;     \
 765         fi;                                             \
 766         $(MAKE) $(build)=init
 767
 768 # Generate System.map
 769 quiet_cmd_sysmap = SYSMAP
 770       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 771
 772 # Link of vmlinux
 773 # If CONFIG_KALLSYMS is set .version is already updated
 774 # Generate System.map and verify that the content is consistent
 775 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 776 # First command is ':' to allow us to use + in front of the rule
 777 define rule_vmlinux__
 778         :
 779         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 780
 781         $(call cmd,vmlinux__)
 782         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 783
 784         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 785           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 786         $(cmd_sysmap) $@ System.map;                                         \
 787         if [ $$? -ne 0 ]; then                                               \
 788                 rm -f $@;                                                    \
 789                 /bin/false;                                                  \
 790         fi;
 791         $(verify_kallsyms)
 792 endef
 793
 794
 795 ifdef CONFIG_KALLSYMS
 796 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 797 # It's a three stage process:
 798 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 799 #   empty
 800 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 801 #   the right size - vmlinux version (uname -v) is updated during this step
 802 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 803 #   but due to the added section, some addresses have shifted.
 804 #   From here, we generate a correct .tmp_kallsyms2.o
 805 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 806 # o Verify that the System.map from vmlinux matches the map from
 807 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 808 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 809 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 810 #   temporary bypass to allow the kernel to be built while the
 811 #   maintainers work out what went wrong with kallsyms.
 812
 813 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 814 last_kallsyms := 3
 815 else
 816 last_kallsyms := 2
 817 endif
 818
 819 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 820
 821 define verify_kallsyms
 822         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 823           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 824           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 825         $(Q)cmp -s System.map .tmp_System.map ||                             \
 826                 (echo Inconsistent kallsyms data;                            \
 827                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 828                  rm .tmp_kallsyms* ; /bin/false )
 829 endef
 830
 831 # Update vmlinux version before link
 832 # Use + in front of this rule to silent warning about make -j1
 833 # First command is ':' to allow us to use + in front of this rule
 834 cmd_ksym_ld = $(cmd_vmlinux__)
 835 define rule_ksym_ld
 836         :
 837         +$(call cmd,vmlinux_version)
 838         $(call cmd,vmlinux__)
 839         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 840 endef
 841
 842 # Generate .S file with all kernel symbols
 843 quiet_cmd_kallsyms = KSYM    $@
 844       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 845                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 846
 847 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 848         $(call if_changed_dep,as_o_S)
 849
 850 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 851         $(call cmd,kallsyms)
 852
 853 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 854 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 855         $(call if_changed_rule,ksym_ld)
 856
 857 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 858         $(call if_changed,vmlinux__)
 859
 860 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 861         $(call if_changed,vmlinux__)
 862
 863 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 864 $(KALLSYMS): scripts ;
 865
 866 # Generate some data for debugging strange kallsyms problems
 867 debug_kallsyms: .tmp_map$(last_kallsyms)
 868
 869 .tmp_map%: .tmp_vmlinux% FORCE
 870         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 871
 872 .tmp_map3: .tmp_map2
 873
 874 .tmp_map2: .tmp_map1
 875
 876 endif # ifdef CONFIG_KALLSYMS
 877
 878 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 879 # relevant sections renamed as per the linker script.
 880 quiet_cmd_vmlinux-modpost = LD      $@
 881       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 882          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 883          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 884 define rule_vmlinux-modpost
 885         :
 886         +$(call cmd,vmlinux-modpost)
 887         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 888         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 889 endef
 890
 891 # vmlinux image - including updated kernel symbols
 892 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 893 ifdef CONFIG_HEADERS_CHECK
 894         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 895 endif
 896 ifdef CONFIG_SAMPLES
 897         $(Q)$(MAKE) $(build)=samples
 898 endif
 899 ifdef CONFIG_BUILD_DOCSRC
 900         $(Q)$(MAKE) $(build)=Documentation
 901 endif
 902         $(call vmlinux-modpost)
 903         $(call if_changed_rule,vmlinux__)
 904         $(Q)rm -f .old_version
 905
 906 # build vmlinux.o first to catch section mismatch errors early
 907 ifdef CONFIG_KALLSYMS
 908 .tmp_vmlinux1: vmlinux.o
 909 endif
 910
 911 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 912 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 913         $(call if_changed_rule,vmlinux-modpost)
 914
 915 # The actual objects are generated when descending,
 916 # make sure no implicit rule kicks in
 917 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 918
 919 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 920 # Preset locale variables to speed up the build process. Limit locale
 921 # tweaks to this spot to avoid wrong language settings when running
 922 # make menuconfig etc.
 923 # Error messages still appears in the original language
 924
 925 PHONY += $(vmlinux-dirs)
 926 $(vmlinux-dirs): prepare scripts
 927         $(Q)$(MAKE) $(build)=$@
 928
 929 # Store (new) KERNELRELASE string in include/config/kernel.release
 930 include/config/kernel.release: include/config/auto.conf FORCE
 931         $(Q)rm -f $@
 932         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 933
 934
 935 # Things we need to do before we recursively start building the kernel
 936 # or the modules are listed in "prepare".
 937 # A multi level approach is used. prepareN is processed before prepareN-1.
 938 # archprepare is used in arch Makefiles and when processed asm symlink,
 939 # version.h and scripts_basic is processed / created.
 940
 941 # Listed in dependency order
 942 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 943
 944 # prepare3 is used to check if we are building in a separate output directory,
 945 # and if so do:
 946 # 1) Check that make has not been executed in the kernel src $(srctree)
 947 prepare3: include/config/kernel.release
 948 ifneq ($(KBUILD_SRC),)
 949         @$(kecho) '  Using $(srctree) as source for kernel'
 950         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 951                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 952                 echo "  in the '$(srctree)' directory.";\
 953                 /bin/false; \
 954         fi;
 955 endif
 956
 957 # prepare2 creates a makefile if using a separate output directory
 958 prepare2: prepare3 outputmakefile
 959
 960 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 961                    include/config/auto.conf
 962         $(cmd_crmodverdir)
 963
 964 archprepare: prepare1 scripts_basic
 965
 966 prepare0: archprepare FORCE
 967         $(Q)$(MAKE) $(build)=.
 968         $(Q)$(MAKE) $(build)=. missing-syscalls
 969
 970 # All the preparing..
 971 prepare: prepare0
 972
 973 # Generate some files
 974 # ---------------------------------------------------------------------------
 975
 976 # KERNELRELEASE can change from a few different places, meaning version.h
 977 # needs to be updated, so this check is forced on all builds
 978
 979 uts_len := 64
 980 define filechk_utsrelease.h
 981         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 982           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 983           exit 1;                                                         \
 984         fi;                                                               \
 985         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 986 endef
 987
 988 define filechk_version.h
 989         (echo \#define LINUX_VERSION_CODE $(shell                             \
 990         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 991         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 992 endef
 993
 994 include/linux/version.h: $(srctree)/Makefile FORCE
 995         $(call filechk,version.h)
 996
 997 include/generated/utsrelease.h: include/config/kernel.release FORCE
 998         $(call filechk,utsrelease.h)
 999
1000 PHONY += headerdep
1001 headerdep:
1002         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1003
1004 # ---------------------------------------------------------------------------
1005
1006 PHONY += depend dep
1007 depend dep:
1008         @echo '*** Warning: make $@ is unnecessary now.'
1009
1010 # ---------------------------------------------------------------------------
1011 # Firmware install
1012 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1013 export INSTALL_FW_PATH
1014
1015 PHONY += firmware_install
1016 firmware_install: FORCE
1017         @mkdir -p $(objtree)/firmware
1018         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1019
1020 # ---------------------------------------------------------------------------
1021 # Kernel headers
1022
1023 #Default location for installed headers
1024 export INSTALL_HDR_PATH = $(objtree)/usr
1025
1026 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1027
1028 # If we do an all arch process set dst to asm-$(hdr-arch)
1029 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1030
1031 PHONY += __headers
1032 __headers: include/linux/version.h scripts_basic FORCE
1033         $(Q)$(MAKE) $(build)=scripts build_unifdef
1034
1035 PHONY += headers_install_all
1036 headers_install_all:
1037         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1038
1039 PHONY += headers_install
1040 headers_install: __headers
1041         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1042         $(error Headers not exportable for the $(SRCARCH) architecture))
1043         $(Q)$(MAKE) $(hdr-inst)=include
1044         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1045
1046 PHONY += headers_check_all
1047 headers_check_all: headers_install_all
1048         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1049
1050 PHONY += headers_check
1051 headers_check: headers_install
1052         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1053         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1054
1055 # ---------------------------------------------------------------------------
1056 # Modules
1057
1058 ifdef CONFIG_MODULES
1059
1060 # By default, build modules as well
1061
1062 all: modules
1063
1064 #       Build modules
1065 #
1066 #       A module can be listed more than once in obj-m resulting in
1067 #       duplicate lines in modules.order files.  Those are removed
1068 #       using awk while concatenating to the final file.
1069
1070 PHONY += modules
1071 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1072         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1073         @$(kecho) '  Building modules, stage 2.';
1074         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1075         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1076
1077 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1078         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1079
1080 %/modules.builtin: include/config/auto.conf
1081         $(Q)$(MAKE) $(modbuiltin)=$*
1082
1083
1084 # Target to prepare building external modules
1085 PHONY += modules_prepare
1086 modules_prepare: prepare scripts
1087
1088 # Target to install modules
1089 PHONY += modules_install
1090 modules_install: _modinst_ _modinst_post
1091
1092 PHONY += _modinst_
1093 _modinst_:
1094         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1095                 echo "Warning: you may need to install module-init-tools"; \
1096                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1097                 sleep 1; \
1098         fi
1099         @rm -rf $(MODLIB)/kernel
1100         @rm -f $(MODLIB)/source
1101         @mkdir -p $(MODLIB)/kernel
1102         @ln -s $(srctree) $(MODLIB)/source
1103         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1104                 rm -f $(MODLIB)/build ; \
1105                 ln -s $(objtree) $(MODLIB)/build ; \
1106         fi
1107         @cp -f $(objtree)/modules.order $(MODLIB)/
1108         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1109         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1110
1111 # This depmod is only for convenience to give the initial
1112 # boot a modules.dep even before / is mounted read-write.  However the
1113 # boot script depmod is the master version.
1114 PHONY += _modinst_post
1115 _modinst_post: _modinst_
1116         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1117         $(call cmd,depmod)
1118
1119 else # CONFIG_MODULES
1120
1121 # Modules not configured
1122 # ---------------------------------------------------------------------------
1123
1124 modules modules_install: FORCE
1125         @echo
1126         @echo "The present kernel configuration has modules disabled."
1127         @echo "Type 'make config' and enable loadable module support."
1128         @echo "Then build a kernel with module support enabled."
1129         @echo
1130         @exit 1
1131
1132 endif # CONFIG_MODULES
1133
1134 ###
1135 # Cleaning is done on three levels.
1136 # make clean     Delete most generated files
1137 #                Leave enough to build external modules
1138 # make mrproper  Delete the current configuration, and all generated files
1139 # make distclean Remove editor backup files, patch leftover files and the like
1140
1141 # Directories & files removed with 'make clean'
1142 CLEAN_DIRS  += $(MODVERDIR)
1143 CLEAN_FILES +=  vmlinux System.map \
1144                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1145
1146 # Directories & files removed with 'make mrproper'
1147 MRPROPER_DIRS  += include/config usr/include include/generated
1148 MRPROPER_FILES += .config .config.old .version .old_version             \
1149                   include/linux/version.h                               \
1150                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1151
1152 # clean - Delete most, but leave enough to build external modules
1153 #
1154 clean: rm-dirs  := $(CLEAN_DIRS)
1155 clean: rm-files := $(CLEAN_FILES)
1156 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1157
1158 PHONY += $(clean-dirs) clean archclean
1159 $(clean-dirs):
1160         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1161
1162 clean: archclean
1163
1164 # mrproper - Delete all generated files, including .config
1165 #
1166 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1167 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1168 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1169
1170 PHONY += $(mrproper-dirs) mrproper archmrproper
1171 $(mrproper-dirs):
1172         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1173
1174 mrproper: clean archmrproper $(mrproper-dirs)
1175         $(call cmd,rmdirs)
1176         $(call cmd,rmfiles)
1177
1178 # distclean
1179 #
1180 PHONY += distclean
1181
1182 distclean: mrproper
1183         @find $(srctree) $(RCS_FIND_IGNORE) \
1184                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1185                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1186                 -o -name '.*.rej' -o -size 0 \
1187                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1188                 -type f -print | xargs rm -f
1189
1190
1191 # Packaging of the kernel to various formats
1192 # ---------------------------------------------------------------------------
1193 # rpm target kept for backward compatibility
1194 package-dir     := $(srctree)/scripts/package
1195
1196 %src-pkg: FORCE
1197         $(Q)$(MAKE) $(build)=$(package-dir) $@
1198 %pkg: include/config/kernel.release FORCE
1199         $(Q)$(MAKE) $(build)=$(package-dir) $@
1200 rpm: include/config/kernel.release FORCE
1201         $(Q)$(MAKE) $(build)=$(package-dir) $@
1202
1203
1204 # Brief documentation of the typical targets used
1205 # ---------------------------------------------------------------------------
1206
1207 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1208 boards := $(notdir $(boards))
1209 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1210 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1211
1212 help:
1213         @echo  'Cleaning targets:'
1214         @echo  '  clean           - Remove most generated files but keep the config and'
1215         @echo  '                    enough build support to build external modules'
1216         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1217         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1218         @echo  ''
1219         @echo  'Configuration targets:'
1220         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1221         @echo  ''
1222         @echo  'Other generic targets:'
1223         @echo  '  all             - Build all targets marked with [*]'
1224         @echo  '* vmlinux         - Build the bare kernel'
1225         @echo  '* modules         - Build all modules'
1226         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1227         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1228         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1229         @echo  '  dir/            - Build all files in dir and below'
1230         @echo  '  dir/file.[oisS] - Build specified target only'
1231         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1232         @echo  '                    (requires a recent binutils and recent build (System.map))'
1233         @echo  '  dir/file.ko     - Build module including final link'
1234         @echo  '  modules_prepare - Set up for building external modules'
1235         @echo  '  tags/TAGS       - Generate tags file for editors'
1236         @echo  '  cscope          - Generate cscope index'
1237         @echo  '  gtags           - Generate GNU GLOBAL index'
1238         @echo  '  kernelrelease   - Output the release version string'
1239         @echo  '  kernelversion   - Output the version stored in Makefile'
1240         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1241          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1242          echo  ''
1243         @echo  'Static analysers'
1244         @echo  '  checkstack      - Generate a list of stack hogs'
1245         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1246         @echo  '  versioncheck    - Sanity check on version.h usage'
1247         @echo  '  includecheck    - Check for duplicate included header files'
1248         @echo  '  export_report   - List the usages of all exported symbols'
1249         @echo  '  headers_check   - Sanity check on exported headers'
1250         @echo  '  headerdep       - Detect inclusion cycles in headers'
1251         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1252         @echo  ''
1253         @echo  'Kernel packaging:'
1254         @$(MAKE) $(build)=$(package-dir) help
1255         @echo  ''
1256         @echo  'Documentation targets:'
1257         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1258         @echo  ''
1259         @echo  'Architecture specific targets ($(SRCARCH)):'
1260         @$(if $(archhelp),$(archhelp),\
1261                 echo '  No architecture specific help defined for $(SRCARCH)')
1262         @echo  ''
1263         @$(if $(boards), \
1264                 $(foreach b, $(boards), \
1265                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1266                 echo '')
1267         @$(if $(board-dirs), \
1268                 $(foreach b, $(board-dirs), \
1269                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1270                 printf "  %-16s - Show all of the above\\n" help-boards; \
1271                 echo '')
1272
1273         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1274         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1275         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1276         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1277         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1278         @echo  '  make W=1   [targets] Enable extra gcc checks'
1279         @echo  ''
1280         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1281         @echo  'For further info see the ./README file'
1282
1283
1284 help-board-dirs := $(addprefix help-,$(board-dirs))
1285
1286 help-boards: $(help-board-dirs)
1287
1288 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1289
1290 $(help-board-dirs): help-%:
1291         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1292         @$(if $(boards-per-dir), \
1293                 $(foreach b, $(boards-per-dir), \
1294                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1295                 echo '')
1296
1297
1298 # Documentation targets
1299 # ---------------------------------------------------------------------------
1300 %docs: scripts_basic FORCE
1301         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1302
1303 else # KBUILD_EXTMOD
1304
1305 ###
1306 # External module support.
1307 # When building external modules the kernel used as basis is considered
1308 # read-only, and no consistency checks are made and the make
1309 # system is not used on the basis kernel. If updates are required
1310 # in the basis kernel ordinary make commands (without M=...) must
1311 # be used.
1312 #
1313 # The following are the only valid targets when building external
1314 # modules.
1315 # make M=dir clean     Delete all automatically generated files
1316 # make M=dir modules   Make all modules in specified dir
1317 # make M=dir           Same as 'make M=dir modules'
1318 # make M=dir modules_install
1319 #                      Install the modules built in the module directory
1320 #                      Assumes install directory is already created
1321
1322 # We are always building modules
1323 KBUILD_MODULES := 1
1324 PHONY += crmodverdir
1325 crmodverdir:
1326         $(cmd_crmodverdir)
1327
1328 PHONY += $(objtree)/Module.symvers
1329 $(objtree)/Module.symvers:
1330         @test -e $(objtree)/Module.symvers || ( \
1331         echo; \
1332         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1333         echo "           is missing; modules will have no dependencies and modversions."; \
1334         echo )
1335
1336 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1337 PHONY += $(module-dirs) modules
1338 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1339         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1340
1341 modules: $(module-dirs)
1342         @$(kecho) '  Building modules, stage 2.';
1343         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1344
1345 PHONY += modules_install
1346 modules_install: _emodinst_ _emodinst_post
1347
1348 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1349 PHONY += _emodinst_
1350 _emodinst_:
1351         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1352         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1353
1354 PHONY += _emodinst_post
1355 _emodinst_post: _emodinst_
1356         $(call cmd,depmod)
1357
1358 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1359
1360 PHONY += $(clean-dirs) clean
1361 $(clean-dirs):
1362         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1363
1364 clean:  rm-dirs := $(MODVERDIR)
1365 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1366
1367 help:
1368         @echo  '  Building external modules.'
1369         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1370         @echo  ''
1371         @echo  '  modules         - default target, build the module(s)'
1372         @echo  '  modules_install - install the module'
1373         @echo  '  clean           - remove generated files in module directory only'
1374         @echo  ''
1375
1376 # Dummies...
1377 PHONY += prepare scripts
1378 prepare: ;
1379 scripts: ;
1380 endif # KBUILD_EXTMOD
1381
1382 clean: $(clean-dirs)
1383         $(call cmd,rmdirs)
1384         $(call cmd,rmfiles)
1385         @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1386                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1387                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1388                 -o -name '*.symtypes' -o -name 'modules.order' \
1389                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1390                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1391
1392 # Generate tags for editors
1393 # ---------------------------------------------------------------------------
1394 quiet_cmd_tags = GEN     $@
1395       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1396
1397 tags TAGS cscope gtags: FORCE
1398         $(call cmd,tags)
1399
1400 # Scripts to check various things for consistency
1401 # ---------------------------------------------------------------------------
1402
1403 includecheck:
1404         find * $(RCS_FIND_IGNORE) \
1405                 -name '*.[hcS]' -type f -print | sort \
1406                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1407
1408 versioncheck:
1409         find * $(RCS_FIND_IGNORE) \
1410                 -name '*.[hcS]' -type f -print | sort \
1411                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1412
1413 coccicheck:
1414         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1415
1416 namespacecheck:
1417         $(PERL) $(srctree)/scripts/namespace.pl
1418
1419 export_report:
1420         $(PERL) $(srctree)/scripts/export_report.pl
1421
1422 endif #ifeq ($(config-targets),1)
1423 endif #ifeq ($(mixed-targets),1)
1424
1425 PHONY += checkstack kernelrelease kernelversion
1426
1427 # UML needs a little special treatment here.  It wants to use the host
1428 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1429 # else wants $(ARCH), including people doing cross-builds, which means
1430 # that $(SUBARCH) doesn't work here.
1431 ifeq ($(ARCH), um)
1432 CHECKSTACK_ARCH := $(SUBARCH)
1433 else
1434 CHECKSTACK_ARCH := $(ARCH)
1435 endif
1436 checkstack:
1437         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1438         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1439
1440 kernelrelease:
1441         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1442
1443 kernelversion:
1444         @echo $(KERNELVERSION)
1445
1446 # Single targets
1447 # ---------------------------------------------------------------------------
1448 # Single targets are compatible with:
1449 # - build with mixed source and output
1450 # - build with separate output dir 'make O=...'
1451 # - external modules
1452 #
1453 #  target-dir => where to store outputfile
1454 #  build-dir  => directory in kernel source tree to use
1455
1456 ifeq ($(KBUILD_EXTMOD),)
1457         build-dir  = $(patsubst %/,%,$(dir $@))
1458         target-dir = $(dir $@)
1459 else
1460         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1461         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1462         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1463 endif
1464
1465 %.s: %.c prepare scripts FORCE
1466         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1467 %.i: %.c prepare scripts FORCE
1468         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1469 %.o: %.c prepare scripts FORCE
1470         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1471 %.lst: %.c prepare scripts FORCE
1472         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1473 %.s: %.S prepare scripts FORCE
1474         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1475 %.o: %.S prepare scripts FORCE
1476         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1477 %.symtypes: %.c prepare scripts FORCE
1478         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1479
1480 # Modules
1481 /: prepare scripts FORCE
1482         $(cmd_crmodverdir)
1483         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1484         $(build)=$(build-dir)
1485 %/: prepare scripts FORCE
1486         $(cmd_crmodverdir)
1487         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1488         $(build)=$(build-dir)
1489 %.ko: prepare scripts FORCE
1490         $(cmd_crmodverdir)
1491         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1492         $(build)=$(build-dir) $(@:.ko=.o)
1493         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1494
1495 # FIXME Should go into a make.lib or something
1496 # ===========================================================================
1497
1498 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1499       cmd_rmdirs = rm -rf $(rm-dirs)
1500
1501 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1502       cmd_rmfiles = rm -f $(rm-files)
1503
1504 # Run depmod only if we have System.map and depmod is executable
1505 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1506       cmd_depmod = \
1507         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1508                 $(DEPMOD) -ae -F System.map                                     \
1509                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1510                 $(KERNELRELEASE);                                               \
1511         fi
1512
1513 # Create temporary dir for module support files
1514 # clean it up only when building all modules
1515 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1516                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1517
1518 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1519           $(KBUILD_AFLAGS_KERNEL)                              \
1520           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1521           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1522
1523 quiet_cmd_as_o_S = AS      $@
1524 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1525
1526 # read all saved command lines
1527
1528 targets := $(wildcard $(sort $(targets)))
1529 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1530
1531 ifneq ($(cmd_files),)
1532   $(cmd_files): ;       # Do not try to update included dependency files
1533   include $(cmd_files)
1534 endif
1535
1536 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1537 # Usage:
1538 # $(Q)$(MAKE) $(clean)=dir
1539 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1540
1541 endif   # skip-makefile
1542
1543 PHONY += FORCE
1544 FORCE:
1545
1546 # Declare the contents of the .PHONY variable as phony.  We keep that
1547 # information in a variable so we can use it in if_changed and friends.
1548 .PHONY: $(PHONY)