Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 39
   4 EXTRAVERSION = -rc1
   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 # Where to locate arch specific headers
 224 hdr-arch  := $(SRCARCH)
 225
 226 ifeq ($(ARCH),m68knommu)
 227        hdr-arch  := m68k
 228 endif
 229
 230 KCONFIG_CONFIG  ?= .config
 231 export KCONFIG_CONFIG
 232
 233 # SHELL used by kbuild
 234 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 235           else if [ -x /bin/bash ]; then echo /bin/bash; \
 236           else echo sh; fi ; fi)
 237
 238 HOSTCC       = gcc
 239 HOSTCXX      = g++
 240 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 241 HOSTCXXFLAGS = -O2
 242
 243 # Decide whether to build built-in, modular, or both.
 244 # Normally, just do built-in.
 245
 246 KBUILD_MODULES :=
 247 KBUILD_BUILTIN := 1
 248
 249 #       If we have only "make modules", don't compile built-in objects.
 250 #       When we're building modules with modversions, we need to consider
 251 #       the built-in objects during the descend as well, in order to
 252 #       make sure the checksums are up to date before we record them.
 253
 254 ifeq ($(MAKECMDGOALS),modules)
 255   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 256 endif
 257
 258 #       If we have "make <whatever> modules", compile modules
 259 #       in addition to whatever we do anyway.
 260 #       Just "make" or "make all" shall build modules as well
 261
 262 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 263   KBUILD_MODULES := 1
 264 endif
 265
 266 ifeq ($(MAKECMDGOALS),)
 267   KBUILD_MODULES := 1
 268 endif
 269
 270 export KBUILD_MODULES KBUILD_BUILTIN
 271 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 272
 273 # Beautify output
 274 # ---------------------------------------------------------------------------
 275 #
 276 # Normally, we echo the whole command before executing it. By making
 277 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 278 # $(quiet) to choose other forms of output instead, e.g.
 279 #
 280 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 281 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 282 #
 283 # If $(quiet) is empty, the whole command will be printed.
 284 # If it is set to "quiet_", only the short version will be printed.
 285 # If it is set to "silent_", nothing will be printed at all, since
 286 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 287 #
 288 # A simple variant is to prefix commands with $(Q) - that's useful
 289 # for commands that shall be hidden in non-verbose mode.
 290 #
 291 #       $(Q)ln $@ :<
 292 #
 293 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 294 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 295
 296 ifeq ($(KBUILD_VERBOSE),1)
 297   quiet =
 298   Q =
 299 else
 300   quiet=quiet_
 301   Q = @
 302 endif
 303
 304 # If the user is running make -s (silent mode), suppress echoing of
 305 # commands
 306
 307 ifneq ($(findstring s,$(MAKEFLAGS)),)
 308   quiet=silent_
 309 endif
 310
 311 export quiet Q KBUILD_VERBOSE
 312
 313
 314 # Look for make include files relative to root of kernel src
 315 MAKEFLAGS += --include-dir=$(srctree)
 316
 317 # We need some generic definitions (do not try to remake the file).
 318 $(srctree)/scripts/Kbuild.include: ;
 319 include $(srctree)/scripts/Kbuild.include
 320
 321 # Make variables (CC, etc...)
 322
 323 AS              = $(CROSS_COMPILE)as
 324 LD              = $(CROSS_COMPILE)ld
 325 CC              = $(CROSS_COMPILE)gcc
 326 CPP             = $(CC) -E
 327 AR              = $(CROSS_COMPILE)ar
 328 NM              = $(CROSS_COMPILE)nm
 329 STRIP           = $(CROSS_COMPILE)strip
 330 OBJCOPY         = $(CROSS_COMPILE)objcopy
 331 OBJDUMP         = $(CROSS_COMPILE)objdump
 332 AWK             = awk
 333 GENKSYMS        = scripts/genksyms/genksyms
 334 INSTALLKERNEL  := installkernel
 335 DEPMOD          = /sbin/depmod
 336 KALLSYMS        = scripts/kallsyms
 337 PERL            = perl
 338 CHECK           = sparse
 339
 340 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 341                   -Wbitwise -Wno-return-void $(CF)
 342 CFLAGS_MODULE   =
 343 AFLAGS_MODULE   =
 344 LDFLAGS_MODULE  =
 345 CFLAGS_KERNEL   =
 346 AFLAGS_KERNEL   =
 347 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 348
 349
 350 # Use LINUXINCLUDE when you must reference the include/ directory.
 351 # Needed to be compatible with the O= option
 352 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 353                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 354                    -include include/generated/autoconf.h
 355
 356 KBUILD_CPPFLAGS := -D__KERNEL__
 357
 358 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 359                    -fno-strict-aliasing -fno-common \
 360                    -Werror-implicit-function-declaration \
 361                    -Wno-format-security \
 362                    -fno-delete-null-pointer-checks
 363 KBUILD_AFLAGS_KERNEL :=
 364 KBUILD_CFLAGS_KERNEL :=
 365 KBUILD_AFLAGS   := -D__ASSEMBLY__
 366 KBUILD_AFLAGS_MODULE  := -DMODULE
 367 KBUILD_CFLAGS_MODULE  := -DMODULE
 368 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 369
 370 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 371 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 372 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 373
 374 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 375 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 376 export CPP AR NM STRIP OBJCOPY OBJDUMP
 377 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 378 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 379
 380 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 381 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 382 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 383 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 384 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 385
 386 # When compiling out-of-tree modules, put MODVERDIR in the module
 387 # tree rather than in the kernel tree. The kernel tree might
 388 # even be read-only.
 389 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 390
 391 # Files to ignore in find ... statements
 392
 393 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
 394 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 395
 396 # ===========================================================================
 397 # Rules shared between *config targets and build targets
 398
 399 # Basic helpers built in scripts/
 400 PHONY += scripts_basic
 401 scripts_basic:
 402         $(Q)$(MAKE) $(build)=scripts/basic
 403         $(Q)rm -f .tmp_quiet_recordmcount
 404
 405 # To avoid any implicit rule to kick in, define an empty command.
 406 scripts/basic/%: scripts_basic ;
 407
 408 PHONY += outputmakefile
 409 # outputmakefile generates a Makefile in the output directory, if using a
 410 # separate output directory. This allows convenient use of make in the
 411 # output directory.
 412 outputmakefile:
 413 ifneq ($(KBUILD_SRC),)
 414         $(Q)ln -fsn $(srctree) source
 415         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 416             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 417 endif
 418
 419 # To make sure we do not include .config for any of the *config targets
 420 # catch them early, and hand them over to scripts/kconfig/Makefile
 421 # It is allowed to specify more targets when calling make, including
 422 # mixing *config targets and build targets.
 423 # For example 'make oldconfig all'.
 424 # Detect when mixed targets is specified, and make a second invocation
 425 # of make so .config is not included in this case either (for *config).
 426
 427 no-dot-config-targets := clean mrproper distclean \
 428                          cscope gtags TAGS tags help %docs check% coccicheck \
 429                          include/linux/version.h headers_% \
 430                          kernelversion %src-pkg
 431
 432 config-targets := 0
 433 mixed-targets  := 0
 434 dot-config     := 1
 435
 436 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 437         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 438                 dot-config := 0
 439         endif
 440 endif
 441
 442 ifeq ($(KBUILD_EXTMOD),)
 443         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 444                 config-targets := 1
 445                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 446                         mixed-targets := 1
 447                 endif
 448         endif
 449 endif
 450
 451 ifeq ($(mixed-targets),1)
 452 # ===========================================================================
 453 # We're called with mixed targets (*config and build targets).
 454 # Handle them one by one.
 455
 456 %:: FORCE
 457         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 458
 459 else
 460 ifeq ($(config-targets),1)
 461 # ===========================================================================
 462 # *config targets only - make sure prerequisites are updated, and descend
 463 # in scripts/kconfig to make the *config target
 464
 465 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 466 # KBUILD_DEFCONFIG may point out an alternative default configuration
 467 # used for 'make defconfig'
 468 include $(srctree)/arch/$(SRCARCH)/Makefile
 469 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 470
 471 config: scripts_basic outputmakefile FORCE
 472         $(Q)mkdir -p include/linux include/config
 473         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 474
 475 %config: scripts_basic outputmakefile FORCE
 476         $(Q)mkdir -p include/linux include/config
 477         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 478
 479 else
 480 # ===========================================================================
 481 # Build targets only - this includes vmlinux, arch specific targets, clean
 482 # targets and others. In general all targets except *config targets.
 483
 484 ifeq ($(KBUILD_EXTMOD),)
 485 # Additional helpers built in scripts/
 486 # Carefully list dependencies so we do not try to build scripts twice
 487 # in parallel
 488 PHONY += scripts
 489 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 490         $(Q)$(MAKE) $(build)=$(@)
 491
 492 # Objects we will link into vmlinux / subdirs we need to visit
 493 init-y          := init/
 494 drivers-y       := drivers/ sound/ firmware/
 495 net-y           := net/
 496 libs-y          := lib/
 497 core-y          := usr/
 498 endif # KBUILD_EXTMOD
 499
 500 ifeq ($(dot-config),1)
 501 # Read in config
 502 -include include/config/auto.conf
 503
 504 ifeq ($(KBUILD_EXTMOD),)
 505 # Read in dependencies to all Kconfig* files, make sure to run
 506 # oldconfig if changes are detected.
 507 -include include/config/auto.conf.cmd
 508
 509 # To avoid any implicit rule to kick in, define an empty command
 510 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 511
 512 # If .config is newer than include/config/auto.conf, someone tinkered
 513 # with it and forgot to run make oldconfig.
 514 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 515 # we execute the config step to be sure to catch updated Kconfig files
 516 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 517         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 518 else
 519 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 520 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 521 PHONY += include/config/auto.conf
 522
 523 include/config/auto.conf:
 524         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 525         echo;                                                           \
 526         echo "  ERROR: Kernel configuration is invalid.";               \
 527         echo "         include/generated/autoconf.h or $@ are missing.";\
 528         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 529         echo;                                                           \
 530         /bin/false)
 531
 532 endif # KBUILD_EXTMOD
 533
 534 else
 535 # Dummy target needed, because used as prerequisite
 536 include/config/auto.conf: ;
 537 endif # $(dot-config)
 538
 539 # The all: target is the default when no target is given on the
 540 # command line.
 541 # This allow a user to issue only 'make' to build a kernel including modules
 542 # Defaults to vmlinux, but the arch makefile usually adds further targets
 543 all: vmlinux
 544
 545 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 546 KBUILD_CFLAGS   += -Os
 547 else
 548 KBUILD_CFLAGS   += -O2
 549 endif
 550
 551 include $(srctree)/arch/$(SRCARCH)/Makefile
 552
 553 ifneq ($(CONFIG_FRAME_WARN),0)
 554 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 555 endif
 556
 557 # Force gcc to behave correct even for buggy distributions
 558 ifndef CONFIG_CC_STACKPROTECTOR
 559 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 560 endif
 561
 562 ifdef CONFIG_FRAME_POINTER
 563 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 564 else
 565 # Some targets (ARM with Thumb2, for example), can't be built with frame
 566 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 567 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 568 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 569 # -fomit-frame-pointer with FUNCTION_TRACER.
 570 ifndef CONFIG_FUNCTION_TRACER
 571 KBUILD_CFLAGS   += -fomit-frame-pointer
 572 endif
 573 endif
 574
 575 ifdef CONFIG_DEBUG_INFO
 576 KBUILD_CFLAGS   += -g
 577 KBUILD_AFLAGS   += -gdwarf-2
 578 endif
 579
 580 ifdef CONFIG_DEBUG_INFO_REDUCED
 581 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 582 endif
 583
 584 ifdef CONFIG_FUNCTION_TRACER
 585 KBUILD_CFLAGS   += -pg
 586 ifdef CONFIG_DYNAMIC_FTRACE
 587         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 588                 BUILD_C_RECORDMCOUNT := y
 589                 export BUILD_C_RECORDMCOUNT
 590         endif
 591 endif
 592 endif
 593
 594 # We trigger additional mismatches with less inlining
 595 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 596 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 597 endif
 598
 599 # arch Makefile may override CC so keep this after arch Makefile is included
 600 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 601 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 602
 603 # warn about C99 declaration after statement
 604 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 605
 606 # disable pointer signed / unsigned warnings in gcc 4.0
 607 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 608
 609 # disable invalid "can't wrap" optimizations for signed / pointers
 610 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 611
 612 # conserve stack if available
 613 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 614
 615 # check for 'asm goto'
 616 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 617         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 618 endif
 619
 620 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 621 # But warn user when we do so
 622 warn-assign = \
 623 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 624
 625 ifneq ($(KCPPFLAGS),)
 626         $(call warn-assign,CPPFLAGS)
 627         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 628 endif
 629 ifneq ($(KAFLAGS),)
 630         $(call warn-assign,AFLAGS)
 631         KBUILD_AFLAGS += $(KAFLAGS)
 632 endif
 633 ifneq ($(KCFLAGS),)
 634         $(call warn-assign,CFLAGS)
 635         KBUILD_CFLAGS += $(KCFLAGS)
 636 endif
 637
 638 # Use --build-id when available.
 639 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 640                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 641 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 642 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 643
 644 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 645 LDFLAGS_vmlinux += $(call ld-option, -X,)
 646 endif
 647
 648 # Default kernel image to build when no specific target is given.
 649 # KBUILD_IMAGE may be overruled on the command line or
 650 # set in the environment
 651 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 652 # this default value
 653 export KBUILD_IMAGE ?= vmlinux
 654
 655 #
 656 # INSTALL_PATH specifies where to place the updated kernel and system map
 657 # images. Default is /boot, but you can set it to other values
 658 export  INSTALL_PATH ?= /boot
 659
 660 #
 661 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 662 # relocations required by build roots.  This is not defined in the
 663 # makefile but the argument can be passed to make if needed.
 664 #
 665
 666 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 667 export MODLIB
 668
 669 #
 670 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 671 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 672 #  the default option --strip-debug will be used.  Otherwise,
 673 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 674
 675 ifdef INSTALL_MOD_STRIP
 676 ifeq ($(INSTALL_MOD_STRIP),1)
 677 mod_strip_cmd = $(STRIP) --strip-debug
 678 else
 679 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 680 endif # INSTALL_MOD_STRIP=1
 681 else
 682 mod_strip_cmd = true
 683 endif # INSTALL_MOD_STRIP
 684 export mod_strip_cmd
 685
 686
 687 ifeq ($(KBUILD_EXTMOD),)
 688 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 689
 690 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 691                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 692                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 693
 694 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 695                      $(init-n) $(init-) \
 696                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 697                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 698
 699 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 700 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 701 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 702 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 703 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 704 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 705 libs-y          := $(libs-y1) $(libs-y2)
 706
 707 # Build vmlinux
 708 # ---------------------------------------------------------------------------
 709 # vmlinux is built from the objects selected by $(vmlinux-init) and
 710 # $(vmlinux-main). Most are built-in.o files from top-level directories
 711 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 712 # Ordering when linking is important, and $(vmlinux-init) must be first.
 713 #
 714 # vmlinux
 715 #   ^
 716 #   |
 717 #   +-< $(vmlinux-init)
 718 #   |   +--< init/version.o + more
 719 #   |
 720 #   +--< $(vmlinux-main)
 721 #   |    +--< driver/built-in.o mm/built-in.o + more
 722 #   |
 723 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 724 #
 725 # vmlinux version (uname -v) cannot be updated during normal
 726 # descending-into-subdirs phase since we do not yet know if we need to
 727 # update vmlinux.
 728 # Therefore this step is delayed until just before final link of vmlinux -
 729 # except in the kallsyms case where it is done just before adding the
 730 # symbols to the kernel.
 731 #
 732 # System.map is generated to document addresses of all kernel symbols
 733
 734 vmlinux-init := $(head-y) $(init-y)
 735 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 736 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 737 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 738 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 739
 740 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 741 # May be overridden by arch/$(ARCH)/Makefile
 742 quiet_cmd_vmlinux__ ?= LD      $@
 743       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 744       -T $(vmlinux-lds) $(vmlinux-init)                          \
 745       --start-group $(vmlinux-main) --end-group                  \
 746       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 747
 748 # Generate new vmlinux version
 749 quiet_cmd_vmlinux_version = GEN     .version
 750       cmd_vmlinux_version = set -e;                     \
 751         if [ ! -r .version ]; then                      \
 752           rm -f .version;                               \
 753           echo 1 >.version;                             \
 754         else                                            \
 755           mv .version .old_version;                     \
 756           expr 0$$(cat .old_version) + 1 >.version;     \
 757         fi;                                             \
 758         $(MAKE) $(build)=init
 759
 760 # Generate System.map
 761 quiet_cmd_sysmap = SYSMAP
 762       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 763
 764 # Link of vmlinux
 765 # If CONFIG_KALLSYMS is set .version is already updated
 766 # Generate System.map and verify that the content is consistent
 767 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 768 # First command is ':' to allow us to use + in front of the rule
 769 define rule_vmlinux__
 770         :
 771         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 772
 773         $(call cmd,vmlinux__)
 774         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 775
 776         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 777           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 778         $(cmd_sysmap) $@ System.map;                                         \
 779         if [ $$? -ne 0 ]; then                                               \
 780                 rm -f $@;                                                    \
 781                 /bin/false;                                                  \
 782         fi;
 783         $(verify_kallsyms)
 784 endef
 785
 786
 787 ifdef CONFIG_KALLSYMS
 788 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 789 # It's a three stage process:
 790 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 791 #   empty
 792 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 793 #   the right size - vmlinux version (uname -v) is updated during this step
 794 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 795 #   but due to the added section, some addresses have shifted.
 796 #   From here, we generate a correct .tmp_kallsyms2.o
 797 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 798 # o Verify that the System.map from vmlinux matches the map from
 799 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 800 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 801 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 802 #   temporary bypass to allow the kernel to be built while the
 803 #   maintainers work out what went wrong with kallsyms.
 804
 805 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 806 last_kallsyms := 3
 807 else
 808 last_kallsyms := 2
 809 endif
 810
 811 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 812
 813 define verify_kallsyms
 814         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 815           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 816           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 817         $(Q)cmp -s System.map .tmp_System.map ||                             \
 818                 (echo Inconsistent kallsyms data;                            \
 819                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 820                  rm .tmp_kallsyms* ; /bin/false )
 821 endef
 822
 823 # Update vmlinux version before link
 824 # Use + in front of this rule to silent warning about make -j1
 825 # First command is ':' to allow us to use + in front of this rule
 826 cmd_ksym_ld = $(cmd_vmlinux__)
 827 define rule_ksym_ld
 828         :
 829         +$(call cmd,vmlinux_version)
 830         $(call cmd,vmlinux__)
 831         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 832 endef
 833
 834 # Generate .S file with all kernel symbols
 835 quiet_cmd_kallsyms = KSYM    $@
 836       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 837                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 838
 839 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 840         $(call if_changed_dep,as_o_S)
 841
 842 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 843         $(call cmd,kallsyms)
 844
 845 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 846 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 847         $(call if_changed_rule,ksym_ld)
 848
 849 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 850         $(call if_changed,vmlinux__)
 851
 852 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 853         $(call if_changed,vmlinux__)
 854
 855 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 856 $(KALLSYMS): scripts ;
 857
 858 # Generate some data for debugging strange kallsyms problems
 859 debug_kallsyms: .tmp_map$(last_kallsyms)
 860
 861 .tmp_map%: .tmp_vmlinux% FORCE
 862         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 863
 864 .tmp_map3: .tmp_map2
 865
 866 .tmp_map2: .tmp_map1
 867
 868 endif # ifdef CONFIG_KALLSYMS
 869
 870 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 871 # relevant sections renamed as per the linker script.
 872 quiet_cmd_vmlinux-modpost = LD      $@
 873       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 874          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 875          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 876 define rule_vmlinux-modpost
 877         :
 878         +$(call cmd,vmlinux-modpost)
 879         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 880         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 881 endef
 882
 883 # vmlinux image - including updated kernel symbols
 884 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 885 ifdef CONFIG_HEADERS_CHECK
 886         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 887 endif
 888 ifdef CONFIG_SAMPLES
 889         $(Q)$(MAKE) $(build)=samples
 890 endif
 891 ifdef CONFIG_BUILD_DOCSRC
 892         $(Q)$(MAKE) $(build)=Documentation
 893 endif
 894         $(call vmlinux-modpost)
 895         $(call if_changed_rule,vmlinux__)
 896         $(Q)rm -f .old_version
 897
 898 # build vmlinux.o first to catch section mismatch errors early
 899 ifdef CONFIG_KALLSYMS
 900 .tmp_vmlinux1: vmlinux.o
 901 endif
 902
 903 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 904 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 905         $(call if_changed_rule,vmlinux-modpost)
 906
 907 # The actual objects are generated when descending,
 908 # make sure no implicit rule kicks in
 909 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 910
 911 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 912 # Preset locale variables to speed up the build process. Limit locale
 913 # tweaks to this spot to avoid wrong language settings when running
 914 # make menuconfig etc.
 915 # Error messages still appears in the original language
 916
 917 PHONY += $(vmlinux-dirs)
 918 $(vmlinux-dirs): prepare scripts
 919         $(Q)$(MAKE) $(build)=$@
 920
 921 # Store (new) KERNELRELASE string in include/config/kernel.release
 922 include/config/kernel.release: include/config/auto.conf FORCE
 923         $(Q)rm -f $@
 924         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 925
 926
 927 # Things we need to do before we recursively start building the kernel
 928 # or the modules are listed in "prepare".
 929 # A multi level approach is used. prepareN is processed before prepareN-1.
 930 # archprepare is used in arch Makefiles and when processed asm symlink,
 931 # version.h and scripts_basic is processed / created.
 932
 933 # Listed in dependency order
 934 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 935
 936 # prepare3 is used to check if we are building in a separate output directory,
 937 # and if so do:
 938 # 1) Check that make has not been executed in the kernel src $(srctree)
 939 prepare3: include/config/kernel.release
 940 ifneq ($(KBUILD_SRC),)
 941         @$(kecho) '  Using $(srctree) as source for kernel'
 942         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 943                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 944                 echo "  in the '$(srctree)' directory.";\
 945                 /bin/false; \
 946         fi;
 947 endif
 948
 949 # prepare2 creates a makefile if using a separate output directory
 950 prepare2: prepare3 outputmakefile
 951
 952 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 953                    include/config/auto.conf
 954         $(cmd_crmodverdir)
 955
 956 archprepare: prepare1 scripts_basic
 957
 958 prepare0: archprepare FORCE
 959         $(Q)$(MAKE) $(build)=.
 960         $(Q)$(MAKE) $(build)=. missing-syscalls
 961
 962 # All the preparing..
 963 prepare: prepare0
 964
 965 # Generate some files
 966 # ---------------------------------------------------------------------------
 967
 968 # KERNELRELEASE can change from a few different places, meaning version.h
 969 # needs to be updated, so this check is forced on all builds
 970
 971 uts_len := 64
 972 define filechk_utsrelease.h
 973         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 974           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 975           exit 1;                                                         \
 976         fi;                                                               \
 977         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 978 endef
 979
 980 define filechk_version.h
 981         (echo \#define LINUX_VERSION_CODE $(shell                             \
 982         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 983         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 984 endef
 985
 986 include/linux/version.h: $(srctree)/Makefile FORCE
 987         $(call filechk,version.h)
 988
 989 include/generated/utsrelease.h: include/config/kernel.release FORCE
 990         $(call filechk,utsrelease.h)
 991
 992 PHONY += headerdep
 993 headerdep:
 994         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
 995
 996 # ---------------------------------------------------------------------------
 997
 998 PHONY += depend dep
 999 depend dep:
1000         @echo '*** Warning: make $@ is unnecessary now.'
1001
1002 # ---------------------------------------------------------------------------
1003 # Firmware install
1004 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1005 export INSTALL_FW_PATH
1006
1007 PHONY += firmware_install
1008 firmware_install: FORCE
1009         @mkdir -p $(objtree)/firmware
1010         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1011
1012 # ---------------------------------------------------------------------------
1013 # Kernel headers
1014
1015 #Default location for installed headers
1016 export INSTALL_HDR_PATH = $(objtree)/usr
1017
1018 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1019
1020 # If we do an all arch process set dst to asm-$(hdr-arch)
1021 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1022
1023 PHONY += __headers
1024 __headers: include/linux/version.h scripts_basic FORCE
1025         $(Q)$(MAKE) $(build)=scripts build_unifdef
1026
1027 PHONY += headers_install_all
1028 headers_install_all:
1029         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1030
1031 PHONY += headers_install
1032 headers_install: __headers
1033         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1034         $(error Headers not exportable for the $(SRCARCH) architecture))
1035         $(Q)$(MAKE) $(hdr-inst)=include
1036         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1037
1038 PHONY += headers_check_all
1039 headers_check_all: headers_install_all
1040         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1041
1042 PHONY += headers_check
1043 headers_check: headers_install
1044         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1045         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1046
1047 # ---------------------------------------------------------------------------
1048 # Modules
1049
1050 ifdef CONFIG_MODULES
1051
1052 # By default, build modules as well
1053
1054 all: modules
1055
1056 #       Build modules
1057 #
1058 #       A module can be listed more than once in obj-m resulting in
1059 #       duplicate lines in modules.order files.  Those are removed
1060 #       using awk while concatenating to the final file.
1061
1062 PHONY += modules
1063 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1064         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1065         @$(kecho) '  Building modules, stage 2.';
1066         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1067         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1068
1069 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1070         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1071
1072 %/modules.builtin: include/config/auto.conf
1073         $(Q)$(MAKE) $(modbuiltin)=$*
1074
1075
1076 # Target to prepare building external modules
1077 PHONY += modules_prepare
1078 modules_prepare: prepare scripts
1079
1080 # Target to install modules
1081 PHONY += modules_install
1082 modules_install: _modinst_ _modinst_post
1083
1084 PHONY += _modinst_
1085 _modinst_:
1086         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1087                 echo "Warning: you may need to install module-init-tools"; \
1088                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1089                 sleep 1; \
1090         fi
1091         @rm -rf $(MODLIB)/kernel
1092         @rm -f $(MODLIB)/source
1093         @mkdir -p $(MODLIB)/kernel
1094         @ln -s $(srctree) $(MODLIB)/source
1095         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1096                 rm -f $(MODLIB)/build ; \
1097                 ln -s $(objtree) $(MODLIB)/build ; \
1098         fi
1099         @cp -f $(objtree)/modules.order $(MODLIB)/
1100         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1101         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1102
1103 # This depmod is only for convenience to give the initial
1104 # boot a modules.dep even before / is mounted read-write.  However the
1105 # boot script depmod is the master version.
1106 PHONY += _modinst_post
1107 _modinst_post: _modinst_
1108         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1109         $(call cmd,depmod)
1110
1111 else # CONFIG_MODULES
1112
1113 # Modules not configured
1114 # ---------------------------------------------------------------------------
1115
1116 modules modules_install: FORCE
1117         @echo
1118         @echo "The present kernel configuration has modules disabled."
1119         @echo "Type 'make config' and enable loadable module support."
1120         @echo "Then build a kernel with module support enabled."
1121         @echo
1122         @exit 1
1123
1124 endif # CONFIG_MODULES
1125
1126 ###
1127 # Cleaning is done on three levels.
1128 # make clean     Delete most generated files
1129 #                Leave enough to build external modules
1130 # make mrproper  Delete the current configuration, and all generated files
1131 # make distclean Remove editor backup files, patch leftover files and the like
1132
1133 # Directories & files removed with 'make clean'
1134 CLEAN_DIRS  += $(MODVERDIR)
1135 CLEAN_FILES +=  vmlinux System.map \
1136                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1137
1138 # Directories & files removed with 'make mrproper'
1139 MRPROPER_DIRS  += include/config usr/include include/generated
1140 MRPROPER_FILES += .config .config.old .version .old_version             \
1141                   include/linux/version.h                               \
1142                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1143
1144 # clean - Delete most, but leave enough to build external modules
1145 #
1146 clean: rm-dirs  := $(CLEAN_DIRS)
1147 clean: rm-files := $(CLEAN_FILES)
1148 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1149
1150 PHONY += $(clean-dirs) clean archclean
1151 $(clean-dirs):
1152         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1153
1154 clean: archclean
1155
1156 # mrproper - Delete all generated files, including .config
1157 #
1158 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1159 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1160 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1161
1162 PHONY += $(mrproper-dirs) mrproper archmrproper
1163 $(mrproper-dirs):
1164         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1165
1166 mrproper: clean archmrproper $(mrproper-dirs)
1167         $(call cmd,rmdirs)
1168         $(call cmd,rmfiles)
1169
1170 # distclean
1171 #
1172 PHONY += distclean
1173
1174 distclean: mrproper
1175         @find $(srctree) $(RCS_FIND_IGNORE) \
1176                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1177                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1178                 -o -name '.*.rej' -o -size 0 \
1179                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1180                 -type f -print | xargs rm -f
1181
1182
1183 # Packaging of the kernel to various formats
1184 # ---------------------------------------------------------------------------
1185 # rpm target kept for backward compatibility
1186 package-dir     := $(srctree)/scripts/package
1187
1188 %src-pkg: FORCE
1189         $(Q)$(MAKE) $(build)=$(package-dir) $@
1190 %pkg: include/config/kernel.release FORCE
1191         $(Q)$(MAKE) $(build)=$(package-dir) $@
1192 rpm: include/config/kernel.release FORCE
1193         $(Q)$(MAKE) $(build)=$(package-dir) $@
1194
1195
1196 # Brief documentation of the typical targets used
1197 # ---------------------------------------------------------------------------
1198
1199 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1200 boards := $(notdir $(boards))
1201 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1202 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1203
1204 help:
1205         @echo  'Cleaning targets:'
1206         @echo  '  clean           - Remove most generated files but keep the config and'
1207         @echo  '                    enough build support to build external modules'
1208         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1209         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1210         @echo  ''
1211         @echo  'Configuration targets:'
1212         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1213         @echo  ''
1214         @echo  'Other generic targets:'
1215         @echo  '  all             - Build all targets marked with [*]'
1216         @echo  '* vmlinux         - Build the bare kernel'
1217         @echo  '* modules         - Build all modules'
1218         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1219         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1220         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1221         @echo  '  dir/            - Build all files in dir and below'
1222         @echo  '  dir/file.[oisS] - Build specified target only'
1223         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1224         @echo  '                    (requires a recent binutils and recent build (System.map))'
1225         @echo  '  dir/file.ko     - Build module including final link'
1226         @echo  '  modules_prepare - Set up for building external modules'
1227         @echo  '  tags/TAGS       - Generate tags file for editors'
1228         @echo  '  cscope          - Generate cscope index'
1229         @echo  '  gtags           - Generate GNU GLOBAL index'
1230         @echo  '  kernelrelease   - Output the release version string'
1231         @echo  '  kernelversion   - Output the version stored in Makefile'
1232         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1233          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1234          echo  ''
1235         @echo  'Static analysers'
1236         @echo  '  checkstack      - Generate a list of stack hogs'
1237         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1238         @echo  '  versioncheck    - Sanity check on version.h usage'
1239         @echo  '  includecheck    - Check for duplicate included header files'
1240         @echo  '  export_report   - List the usages of all exported symbols'
1241         @echo  '  headers_check   - Sanity check on exported headers'
1242         @echo  '  headerdep       - Detect inclusion cycles in headers'
1243         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1244         @echo  ''
1245         @echo  'Kernel packaging:'
1246         @$(MAKE) $(build)=$(package-dir) help
1247         @echo  ''
1248         @echo  'Documentation targets:'
1249         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1250         @echo  ''
1251         @echo  'Architecture specific targets ($(SRCARCH)):'
1252         @$(if $(archhelp),$(archhelp),\
1253                 echo '  No architecture specific help defined for $(SRCARCH)')
1254         @echo  ''
1255         @$(if $(boards), \
1256                 $(foreach b, $(boards), \
1257                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1258                 echo '')
1259         @$(if $(board-dirs), \
1260                 $(foreach b, $(board-dirs), \
1261                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1262                 printf "  %-16s - Show all of the above\\n" help-boards; \
1263                 echo '')
1264
1265         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1266         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1267         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1268         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1269         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1270         @echo  '  make W=1   [targets] Enable extra gcc checks'
1271         @echo  ''
1272         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1273         @echo  'For further info see the ./README file'
1274
1275
1276 help-board-dirs := $(addprefix help-,$(board-dirs))
1277
1278 help-boards: $(help-board-dirs)
1279
1280 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1281
1282 $(help-board-dirs): help-%:
1283         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1284         @$(if $(boards-per-dir), \
1285                 $(foreach b, $(boards-per-dir), \
1286                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1287                 echo '')
1288
1289
1290 # Documentation targets
1291 # ---------------------------------------------------------------------------
1292 %docs: scripts_basic FORCE
1293         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1294
1295 else # KBUILD_EXTMOD
1296
1297 ###
1298 # External module support.
1299 # When building external modules the kernel used as basis is considered
1300 # read-only, and no consistency checks are made and the make
1301 # system is not used on the basis kernel. If updates are required
1302 # in the basis kernel ordinary make commands (without M=...) must
1303 # be used.
1304 #
1305 # The following are the only valid targets when building external
1306 # modules.
1307 # make M=dir clean     Delete all automatically generated files
1308 # make M=dir modules   Make all modules in specified dir
1309 # make M=dir           Same as 'make M=dir modules'
1310 # make M=dir modules_install
1311 #                      Install the modules built in the module directory
1312 #                      Assumes install directory is already created
1313
1314 # We are always building modules
1315 KBUILD_MODULES := 1
1316 PHONY += crmodverdir
1317 crmodverdir:
1318         $(cmd_crmodverdir)
1319
1320 PHONY += $(objtree)/Module.symvers
1321 $(objtree)/Module.symvers:
1322         @test -e $(objtree)/Module.symvers || ( \
1323         echo; \
1324         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1325         echo "           is missing; modules will have no dependencies and modversions."; \
1326         echo )
1327
1328 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1329 PHONY += $(module-dirs) modules
1330 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1331         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1332
1333 modules: $(module-dirs)
1334         @$(kecho) '  Building modules, stage 2.';
1335         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1336
1337 PHONY += modules_install
1338 modules_install: _emodinst_ _emodinst_post
1339
1340 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1341 PHONY += _emodinst_
1342 _emodinst_:
1343         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1344         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1345
1346 PHONY += _emodinst_post
1347 _emodinst_post: _emodinst_
1348         $(call cmd,depmod)
1349
1350 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1351
1352 PHONY += $(clean-dirs) clean
1353 $(clean-dirs):
1354         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1355
1356 clean:  rm-dirs := $(MODVERDIR)
1357 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1358
1359 help:
1360         @echo  '  Building external modules.'
1361         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1362         @echo  ''
1363         @echo  '  modules         - default target, build the module(s)'
1364         @echo  '  modules_install - install the module'
1365         @echo  '  clean           - remove generated files in module directory only'
1366         @echo  ''
1367
1368 # Dummies...
1369 PHONY += prepare scripts
1370 prepare: ;
1371 scripts: ;
1372 endif # KBUILD_EXTMOD
1373
1374 clean: $(clean-dirs)
1375         $(call cmd,rmdirs)
1376         $(call cmd,rmfiles)
1377         @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1378                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1379                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1380                 -o -name '*.symtypes' -o -name 'modules.order' \
1381                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1382                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1383
1384 # Generate tags for editors
1385 # ---------------------------------------------------------------------------
1386 quiet_cmd_tags = GEN     $@
1387       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1388
1389 tags TAGS cscope gtags: FORCE
1390         $(call cmd,tags)
1391
1392 # Scripts to check various things for consistency
1393 # ---------------------------------------------------------------------------
1394
1395 includecheck:
1396         find * $(RCS_FIND_IGNORE) \
1397                 -name '*.[hcS]' -type f -print | sort \
1398                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1399
1400 versioncheck:
1401         find * $(RCS_FIND_IGNORE) \
1402                 -name '*.[hcS]' -type f -print | sort \
1403                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1404
1405 coccicheck:
1406         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1407
1408 namespacecheck:
1409         $(PERL) $(srctree)/scripts/namespace.pl
1410
1411 export_report:
1412         $(PERL) $(srctree)/scripts/export_report.pl
1413
1414 endif #ifeq ($(config-targets),1)
1415 endif #ifeq ($(mixed-targets),1)
1416
1417 PHONY += checkstack kernelrelease kernelversion
1418
1419 # UML needs a little special treatment here.  It wants to use the host
1420 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1421 # else wants $(ARCH), including people doing cross-builds, which means
1422 # that $(SUBARCH) doesn't work here.
1423 ifeq ($(ARCH), um)
1424 CHECKSTACK_ARCH := $(SUBARCH)
1425 else
1426 CHECKSTACK_ARCH := $(ARCH)
1427 endif
1428 checkstack:
1429         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1430         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1431
1432 kernelrelease:
1433         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1434
1435 kernelversion:
1436         @echo $(KERNELVERSION)
1437
1438 # Single targets
1439 # ---------------------------------------------------------------------------
1440 # Single targets are compatible with:
1441 # - build with mixed source and output
1442 # - build with separate output dir 'make O=...'
1443 # - external modules
1444 #
1445 #  target-dir => where to store outputfile
1446 #  build-dir  => directory in kernel source tree to use
1447
1448 ifeq ($(KBUILD_EXTMOD),)
1449         build-dir  = $(patsubst %/,%,$(dir $@))
1450         target-dir = $(dir $@)
1451 else
1452         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1453         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1454         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1455 endif
1456
1457 %.s: %.c prepare scripts FORCE
1458         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1459 %.i: %.c prepare scripts FORCE
1460         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1461 %.o: %.c prepare scripts FORCE
1462         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1463 %.lst: %.c prepare scripts FORCE
1464         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1465 %.s: %.S prepare scripts FORCE
1466         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1467 %.o: %.S prepare scripts FORCE
1468         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1469 %.symtypes: %.c prepare scripts FORCE
1470         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1471
1472 # Modules
1473 /: prepare scripts FORCE
1474         $(cmd_crmodverdir)
1475         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1476         $(build)=$(build-dir)
1477 %/: prepare scripts FORCE
1478         $(cmd_crmodverdir)
1479         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1480         $(build)=$(build-dir)
1481 %.ko: prepare scripts FORCE
1482         $(cmd_crmodverdir)
1483         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1484         $(build)=$(build-dir) $(@:.ko=.o)
1485         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1486
1487 # FIXME Should go into a make.lib or something
1488 # ===========================================================================
1489
1490 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1491       cmd_rmdirs = rm -rf $(rm-dirs)
1492
1493 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1494       cmd_rmfiles = rm -f $(rm-files)
1495
1496 # Run depmod only if we have System.map and depmod is executable
1497 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1498       cmd_depmod = \
1499         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1500                 $(DEPMOD) -ae -F System.map                                     \
1501                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1502                 $(KERNELRELEASE);                                               \
1503         fi
1504
1505 # Create temporary dir for module support files
1506 # clean it up only when building all modules
1507 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1508                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1509
1510 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1511           $(KBUILD_AFLAGS_KERNEL)                              \
1512           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1513           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1514
1515 quiet_cmd_as_o_S = AS      $@
1516 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1517
1518 # read all saved command lines
1519
1520 targets := $(wildcard $(sort $(targets)))
1521 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1522
1523 ifneq ($(cmd_files),)
1524   $(cmd_files): ;       # Do not try to update included dependency files
1525   include $(cmd_files)
1526 endif
1527
1528 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1529 # Usage:
1530 # $(Q)$(MAKE) $(clean)=dir
1531 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1532
1533 endif   # skip-makefile
1534
1535 PHONY += FORCE
1536 FORCE:
1537
1538 # Declare the contents of the .PHONY variable as phony.  We keep that
1539 # information in a variable so we can use it in if_changed and friends.
1540 .PHONY: $(PHONY)