Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 33
   4 EXTRAVERSION = .7
   5 NAME = Man-Eating Seals of Antiquity
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # Do not:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoids hard-to-debug behaviour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # Avoid funny character set dependencies
  20 unexport LC_ALL
  21 LC_COLLATE=C
  22 LC_NUMERIC=C
  23 export LC_COLLATE LC_NUMERIC
  24
  25 # We are using a recursive build, so we need to do a little thinking
  26 # to get the ordering right.
  27 #
  28 # Most importantly: sub-Makefiles should only ever modify files in
  29 # their own directory. If in some directory we have a dependency on
  30 # a file in another dir (which doesn't happen often, but it's often
  31 # unavoidable when linking the built-in.o targets which finally
  32 # turn into vmlinux), we will call a sub make in that other dir, and
  33 # after that we are sure that everything which is in that other dir
  34 # is now up to date.
  35 #
  36 # The only cases where we need to modify files which have global
  37 # effects are thus separated out and done before the recursive
  38 # descending is started. They are now explicitly listed as the
  39 # prepare rule.
  40
  41 # To put more focus on warnings, be less verbose as default
  42 # Use 'make V=1' to see the full commands
  43
  44 ifeq ("$(origin V)", "command line")
  45   KBUILD_VERBOSE = $(V)
  46 endif
  47 ifndef KBUILD_VERBOSE
  48   KBUILD_VERBOSE = 0
  49 endif
  50
  51 # Call a source code checker (by default, "sparse") as part of the
  52 # C compilation.
  53 #
  54 # Use 'make C=1' to enable checking of only re-compiled files.
  55 # Use 'make C=2' to enable checking of *all* source files, regardless
  56 # of whether they are re-compiled or not.
  57 #
  58 # See the file "Documentation/sparse.txt" for more details, including
  59 # where to get the "sparse" utility.
  60
  61 ifeq ("$(origin C)", "command line")
  62   KBUILD_CHECKSRC = $(C)
  63 endif
  64 ifndef KBUILD_CHECKSRC
  65   KBUILD_CHECKSRC = 0
  66 endif
  67
  68 # Use make M=dir to specify directory of external module to build
  69 # Old syntax make ... SUBDIRS=$PWD is still supported
  70 # Setting the environment variable KBUILD_EXTMOD take precedence
  71 ifdef SUBDIRS
  72   KBUILD_EXTMOD ?= $(SUBDIRS)
  73 endif
  74
  75 ifeq ("$(origin M)", "command line")
  76   KBUILD_EXTMOD := $(M)
  77 endif
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(KBUILD_SRC),)
  98
  99 # OK, Make called in directory where kernel src resides
 100 # Do we want to locate output files in a separate directory?
 101 ifeq ("$(origin O)", "command line")
 102   KBUILD_OUTPUT := $(O)
 103 endif
 104
 105 # That's our default target when none is given on the command line
 106 PHONY := _all
 107 _all:
 108
 109 # Cancel implicit rules on top Makefile
 110 $(CURDIR)/Makefile Makefile: ;
 111
 112 ifneq ($(KBUILD_OUTPUT),)
 113 # Invoke a second make in the output directory, passing relevant variables
 114 # check that the output directory actually exists
 115 saved-output := $(KBUILD_OUTPUT)
 116 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 117 $(if $(KBUILD_OUTPUT),, \
 118      $(error output directory "$(saved-output)" does not exist))
 119
 120 PHONY += $(MAKECMDGOALS) sub-make
 121
 122 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 123         $(Q)@:
 124
 125 sub-make: FORCE
 126         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 127         KBUILD_SRC=$(CURDIR) \
 128         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 129         $(filter-out _all sub-make,$(MAKECMDGOALS))
 130
 131 # Leave processing to above invocation of make
 132 skip-makefile := 1
 133 endif # ifneq ($(KBUILD_OUTPUT),)
 134 endif # ifeq ($(KBUILD_SRC),)
 135
 136 # We process the rest of the Makefile if this is the final invocation of make
 137 ifeq ($(skip-makefile),)
 138
 139 # If building an external module we do not care about the all: rule
 140 # but instead _all depend on modules
 141 PHONY += all
 142 ifeq ($(KBUILD_EXTMOD),)
 143 _all: all
 144 else
 145 _all: modules
 146 endif
 147
 148 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 149 objtree         := $(CURDIR)
 150 src             := $(srctree)
 151 obj             := $(objtree)
 152
 153 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 154
 155 export srctree objtree VPATH
 156
 157
 158 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 159 # first, and if a usermode build is happening, the "ARCH=um" on the command
 160 # line overrides the setting of ARCH below.  If a native build is happening,
 161 # then ARCH is assigned, getting whatever value it gets normally, and
 162 # SUBARCH is subsequently ignored.
 163
 164 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 165                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 166                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 167                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 168                                   -e s/sh[234].*/sh/ )
 169
 170 # Cross compiling and selecting different set of gcc/bin-utils
 171 # ---------------------------------------------------------------------------
 172 #
 173 # When performing cross compilation for other architectures ARCH shall be set
 174 # to the target architecture. (See arch/* for the possibilities).
 175 # ARCH can be set during invocation of make:
 176 # make ARCH=ia64
 177 # Another way is to have ARCH set in the environment.
 178 # The default ARCH is the host where make is executed.
 179
 180 # CROSS_COMPILE specify the prefix used for all executables used
 181 # during compilation. Only gcc and related bin-utils executables
 182 # are prefixed with $(CROSS_COMPILE).
 183 # CROSS_COMPILE can be set on the command line
 184 # make CROSS_COMPILE=ia64-linux-
 185 # Alternatively CROSS_COMPILE can be set in the environment.
 186 # Default value for CROSS_COMPILE is not to prefix executables
 187 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 188 export KBUILD_BUILDHOST := $(SUBARCH)
 189 ARCH            ?= $(SUBARCH)
 190 CROSS_COMPILE   ?=
 191
 192 # Architecture as present in compile.h
 193 UTS_MACHINE     := $(ARCH)
 194 SRCARCH         := $(ARCH)
 195
 196 # Additional ARCH settings for x86
 197 ifeq ($(ARCH),i386)
 198         SRCARCH := x86
 199 endif
 200 ifeq ($(ARCH),x86_64)
 201         SRCARCH := x86
 202 endif
 203
 204 # Additional ARCH settings for sparc
 205 ifeq ($(ARCH),sparc64)
 206        SRCARCH := sparc
 207 endif
 208
 209 # Additional ARCH settings for sh
 210 ifeq ($(ARCH),sh64)
 211        SRCARCH := sh
 212 endif
 213
 214 # Where to locate arch specific headers
 215 hdr-arch  := $(SRCARCH)
 216
 217 ifeq ($(ARCH),m68knommu)
 218        hdr-arch  := m68k
 219 endif
 220
 221 KCONFIG_CONFIG  ?= .config
 222
 223 # SHELL used by kbuild
 224 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 225           else if [ -x /bin/bash ]; then echo /bin/bash; \
 226           else echo sh; fi ; fi)
 227
 228 HOSTCC       = gcc
 229 HOSTCXX      = g++
 230 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 231 HOSTCXXFLAGS = -O2
 232
 233 # Decide whether to build built-in, modular, or both.
 234 # Normally, just do built-in.
 235
 236 KBUILD_MODULES :=
 237 KBUILD_BUILTIN := 1
 238
 239 #       If we have only "make modules", don't compile built-in objects.
 240 #       When we're building modules with modversions, we need to consider
 241 #       the built-in objects during the descend as well, in order to
 242 #       make sure the checksums are up to date before we record them.
 243
 244 ifeq ($(MAKECMDGOALS),modules)
 245   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 246 endif
 247
 248 #       If we have "make <whatever> modules", compile modules
 249 #       in addition to whatever we do anyway.
 250 #       Just "make" or "make all" shall build modules as well
 251
 252 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 253   KBUILD_MODULES := 1
 254 endif
 255
 256 ifeq ($(MAKECMDGOALS),)
 257   KBUILD_MODULES := 1
 258 endif
 259
 260 export KBUILD_MODULES KBUILD_BUILTIN
 261 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 262
 263 # Beautify output
 264 # ---------------------------------------------------------------------------
 265 #
 266 # Normally, we echo the whole command before executing it. By making
 267 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 268 # $(quiet) to choose other forms of output instead, e.g.
 269 #
 270 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 271 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 272 #
 273 # If $(quiet) is empty, the whole command will be printed.
 274 # If it is set to "quiet_", only the short version will be printed.
 275 # If it is set to "silent_", nothing will be printed at all, since
 276 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 277 #
 278 # A simple variant is to prefix commands with $(Q) - that's useful
 279 # for commands that shall be hidden in non-verbose mode.
 280 #
 281 #       $(Q)ln $@ :<
 282 #
 283 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 284 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 285
 286 ifeq ($(KBUILD_VERBOSE),1)
 287   quiet =
 288   Q =
 289 else
 290   quiet=quiet_
 291   Q = @
 292 endif
 293
 294 # If the user is running make -s (silent mode), suppress echoing of
 295 # commands
 296
 297 ifneq ($(findstring s,$(MAKEFLAGS)),)
 298   quiet=silent_
 299 endif
 300
 301 export quiet Q KBUILD_VERBOSE
 302
 303
 304 # Look for make include files relative to root of kernel src
 305 MAKEFLAGS += --include-dir=$(srctree)
 306
 307 # We need some generic definitions (do not try to remake the file).
 308 $(srctree)/scripts/Kbuild.include: ;
 309 include $(srctree)/scripts/Kbuild.include
 310
 311 # Make variables (CC, etc...)
 312
 313 AS              = $(CROSS_COMPILE)as
 314 LD              = $(CROSS_COMPILE)ld
 315 CC              = $(CROSS_COMPILE)gcc
 316 CPP             = $(CC) -E
 317 AR              = $(CROSS_COMPILE)ar
 318 NM              = $(CROSS_COMPILE)nm
 319 STRIP           = $(CROSS_COMPILE)strip
 320 OBJCOPY         = $(CROSS_COMPILE)objcopy
 321 OBJDUMP         = $(CROSS_COMPILE)objdump
 322 AWK             = awk
 323 GENKSYMS        = scripts/genksyms/genksyms
 324 INSTALLKERNEL  := installkernel
 325 DEPMOD          = /sbin/depmod
 326 KALLSYMS        = scripts/kallsyms
 327 PERL            = perl
 328 CHECK           = sparse
 329
 330 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 331                   -Wbitwise -Wno-return-void $(CF)
 332 MODFLAGS        = -DMODULE
 333 CFLAGS_MODULE   = $(MODFLAGS)
 334 AFLAGS_MODULE   = $(MODFLAGS)
 335 LDFLAGS_MODULE  = -T $(srctree)/scripts/module-common.lds
 336 CFLAGS_KERNEL   =
 337 AFLAGS_KERNEL   =
 338 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 339
 340
 341 # Use LINUXINCLUDE when you must reference the include/ directory.
 342 # Needed to be compatible with the O= option
 343 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 344                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 345                    -include include/generated/autoconf.h
 346
 347 KBUILD_CPPFLAGS := -D__KERNEL__
 348
 349 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 350                    -fno-strict-aliasing -fno-common \
 351                    -Werror-implicit-function-declaration \
 352                    -Wno-format-security \
 353                    -fno-delete-null-pointer-checks
 354 KBUILD_AFLAGS   := -D__ASSEMBLY__
 355
 356 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 357 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 358 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 359
 360 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 361 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 362 export CPP AR NM STRIP OBJCOPY OBJDUMP
 363 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 364 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 365
 366 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 367 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 368 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 369
 370 # When compiling out-of-tree modules, put MODVERDIR in the module
 371 # tree rather than in the kernel tree. The kernel tree might
 372 # even be read-only.
 373 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 374
 375 # Files to ignore in find ... statements
 376
 377 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
 378 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 379
 380 # ===========================================================================
 381 # Rules shared between *config targets and build targets
 382
 383 # Basic helpers built in scripts/
 384 PHONY += scripts_basic
 385 scripts_basic:
 386         $(Q)$(MAKE) $(build)=scripts/basic
 387         $(Q)rm -f .tmp_quiet_recordmcount
 388
 389 # To avoid any implicit rule to kick in, define an empty command.
 390 scripts/basic/%: scripts_basic ;
 391
 392 PHONY += outputmakefile
 393 # outputmakefile generates a Makefile in the output directory, if using a
 394 # separate output directory. This allows convenient use of make in the
 395 # output directory.
 396 outputmakefile:
 397 ifneq ($(KBUILD_SRC),)
 398         $(Q)ln -fsn $(srctree) source
 399         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 400             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 401 endif
 402
 403 # To make sure we do not include .config for any of the *config targets
 404 # catch them early, and hand them over to scripts/kconfig/Makefile
 405 # It is allowed to specify more targets when calling make, including
 406 # mixing *config targets and build targets.
 407 # For example 'make oldconfig all'.
 408 # Detect when mixed targets is specified, and make a second invocation
 409 # of make so .config is not included in this case either (for *config).
 410
 411 no-dot-config-targets := clean mrproper distclean \
 412                          cscope TAGS tags help %docs check% \
 413                          include/linux/version.h headers_% \
 414                          kernelrelease kernelversion
 415
 416 config-targets := 0
 417 mixed-targets  := 0
 418 dot-config     := 1
 419
 420 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 421         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 422                 dot-config := 0
 423         endif
 424 endif
 425
 426 ifeq ($(KBUILD_EXTMOD),)
 427         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 428                 config-targets := 1
 429                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 430                         mixed-targets := 1
 431                 endif
 432         endif
 433 endif
 434
 435 ifeq ($(mixed-targets),1)
 436 # ===========================================================================
 437 # We're called with mixed targets (*config and build targets).
 438 # Handle them one by one.
 439
 440 %:: FORCE
 441         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 442
 443 else
 444 ifeq ($(config-targets),1)
 445 # ===========================================================================
 446 # *config targets only - make sure prerequisites are updated, and descend
 447 # in scripts/kconfig to make the *config target
 448
 449 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 450 # KBUILD_DEFCONFIG may point out an alternative default configuration
 451 # used for 'make defconfig'
 452 include $(srctree)/arch/$(SRCARCH)/Makefile
 453 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 454
 455 config: scripts_basic outputmakefile FORCE
 456         $(Q)mkdir -p include/linux include/config
 457         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 458
 459 %config: scripts_basic outputmakefile FORCE
 460         $(Q)mkdir -p include/linux include/config
 461         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 462
 463 else
 464 # ===========================================================================
 465 # Build targets only - this includes vmlinux, arch specific targets, clean
 466 # targets and others. In general all targets except *config targets.
 467
 468 ifeq ($(KBUILD_EXTMOD),)
 469 # Additional helpers built in scripts/
 470 # Carefully list dependencies so we do not try to build scripts twice
 471 # in parallel
 472 PHONY += scripts
 473 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 474         $(Q)$(MAKE) $(build)=$(@)
 475
 476 # Objects we will link into vmlinux / subdirs we need to visit
 477 init-y          := init/
 478 drivers-y       := drivers/ sound/ firmware/
 479 net-y           := net/
 480 libs-y          := lib/
 481 core-y          := usr/
 482 endif # KBUILD_EXTMOD
 483
 484 ifeq ($(dot-config),1)
 485 # Read in config
 486 -include include/config/auto.conf
 487
 488 ifeq ($(KBUILD_EXTMOD),)
 489 # Read in dependencies to all Kconfig* files, make sure to run
 490 # oldconfig if changes are detected.
 491 -include include/config/auto.conf.cmd
 492
 493 # To avoid any implicit rule to kick in, define an empty command
 494 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 495
 496 # If .config is newer than include/config/auto.conf, someone tinkered
 497 # with it and forgot to run make oldconfig.
 498 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 499 # we execute the config step to be sure to catch updated Kconfig files
 500 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 501         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 502 else
 503 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 504 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 505 PHONY += include/config/auto.conf
 506
 507 include/config/auto.conf:
 508         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 509         echo;                                                           \
 510         echo "  ERROR: Kernel configuration is invalid.";               \
 511         echo "         include/generated/autoconf.h or $@ are missing.";\
 512         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 513         echo;                                                           \
 514         /bin/false)
 515
 516 endif # KBUILD_EXTMOD
 517
 518 else
 519 # Dummy target needed, because used as prerequisite
 520 include/config/auto.conf: ;
 521 endif # $(dot-config)
 522
 523 # The all: target is the default when no target is given on the
 524 # command line.
 525 # This allow a user to issue only 'make' to build a kernel including modules
 526 # Defaults vmlinux but it is usually overridden in the arch makefile
 527 all: vmlinux
 528
 529 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 530 KBUILD_CFLAGS   += -Os
 531 else
 532 KBUILD_CFLAGS   += -O2
 533 endif
 534
 535 include $(srctree)/arch/$(SRCARCH)/Makefile
 536
 537 ifneq ($(CONFIG_FRAME_WARN),0)
 538 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 539 endif
 540
 541 # Force gcc to behave correct even for buggy distributions
 542 ifndef CONFIG_CC_STACKPROTECTOR
 543 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 544 endif
 545
 546 ifdef CONFIG_FRAME_POINTER
 547 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 548 else
 549 KBUILD_CFLAGS   += -fomit-frame-pointer
 550 endif
 551
 552 ifdef CONFIG_DEBUG_INFO
 553 KBUILD_CFLAGS   += -g
 554 KBUILD_AFLAGS   += -gdwarf-2
 555 endif
 556
 557 ifdef CONFIG_FUNCTION_TRACER
 558 KBUILD_CFLAGS   += -pg
 559 endif
 560
 561 # We trigger additional mismatches with less inlining
 562 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 563 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 564 endif
 565
 566 # arch Makefile may override CC so keep this after arch Makefile is included
 567 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 568 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 569
 570 # warn about C99 declaration after statement
 571 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 572
 573 # disable pointer signed / unsigned warnings in gcc 4.0
 574 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 575
 576 # disable invalid "can't wrap" optimizations for signed / pointers
 577 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 578
 579 # revert to pre-gcc-4.4 behaviour of .eh_frame
 580 KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 581
 582 # conserve stack if available
 583 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 584
 585 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 586 # But warn user when we do so
 587 warn-assign = \
 588 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 589
 590 ifneq ($(KCPPFLAGS),)
 591         $(call warn-assign,CPPFLAGS)
 592         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 593 endif
 594 ifneq ($(KAFLAGS),)
 595         $(call warn-assign,AFLAGS)
 596         KBUILD_AFLAGS += $(KAFLAGS)
 597 endif
 598 ifneq ($(KCFLAGS),)
 599         $(call warn-assign,CFLAGS)
 600         KBUILD_CFLAGS += $(KCFLAGS)
 601 endif
 602
 603 # Use --build-id when available.
 604 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 605                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 606 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 607 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 608
 609 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 610 LDFLAGS_vmlinux += $(call ld-option, -X,)
 611 endif
 612
 613 # Default kernel image to build when no specific target is given.
 614 # KBUILD_IMAGE may be overruled on the command line or
 615 # set in the environment
 616 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 617 # this default value
 618 export KBUILD_IMAGE ?= vmlinux
 619
 620 #
 621 # INSTALL_PATH specifies where to place the updated kernel and system map
 622 # images. Default is /boot, but you can set it to other values
 623 export  INSTALL_PATH ?= /boot
 624
 625 #
 626 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 627 # relocations required by build roots.  This is not defined in the
 628 # makefile but the argument can be passed to make if needed.
 629 #
 630
 631 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 632 export MODLIB
 633
 634 #
 635 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 636 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 637 #  the default option --strip-debug will be used.  Otherwise,
 638 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 639
 640 ifdef INSTALL_MOD_STRIP
 641 ifeq ($(INSTALL_MOD_STRIP),1)
 642 mod_strip_cmd = $(STRIP) --strip-debug
 643 else
 644 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 645 endif # INSTALL_MOD_STRIP=1
 646 else
 647 mod_strip_cmd = true
 648 endif # INSTALL_MOD_STRIP
 649 export mod_strip_cmd
 650
 651
 652 ifeq ($(KBUILD_EXTMOD),)
 653 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 654
 655 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 656                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 657                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 658
 659 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 660                      $(init-n) $(init-) \
 661                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 662                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 663
 664 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 665 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 666 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 667 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 668 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 669 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 670 libs-y          := $(libs-y1) $(libs-y2)
 671
 672 # Build vmlinux
 673 # ---------------------------------------------------------------------------
 674 # vmlinux is built from the objects selected by $(vmlinux-init) and
 675 # $(vmlinux-main). Most are built-in.o files from top-level directories
 676 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 677 # Ordering when linking is important, and $(vmlinux-init) must be first.
 678 #
 679 # vmlinux
 680 #   ^
 681 #   |
 682 #   +-< $(vmlinux-init)
 683 #   |   +--< init/version.o + more
 684 #   |
 685 #   +--< $(vmlinux-main)
 686 #   |    +--< driver/built-in.o mm/built-in.o + more
 687 #   |
 688 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 689 #
 690 # vmlinux version (uname -v) cannot be updated during normal
 691 # descending-into-subdirs phase since we do not yet know if we need to
 692 # update vmlinux.
 693 # Therefore this step is delayed until just before final link of vmlinux -
 694 # except in the kallsyms case where it is done just before adding the
 695 # symbols to the kernel.
 696 #
 697 # System.map is generated to document addresses of all kernel symbols
 698
 699 vmlinux-init := $(head-y) $(init-y)
 700 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 701 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 702 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 703 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 704
 705 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 706 # May be overridden by arch/$(ARCH)/Makefile
 707 quiet_cmd_vmlinux__ ?= LD      $@
 708       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 709       -T $(vmlinux-lds) $(vmlinux-init)                          \
 710       --start-group $(vmlinux-main) --end-group                  \
 711       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 712
 713 # Generate new vmlinux version
 714 quiet_cmd_vmlinux_version = GEN     .version
 715       cmd_vmlinux_version = set -e;                     \
 716         if [ ! -r .version ]; then                      \
 717           rm -f .version;                               \
 718           echo 1 >.version;                             \
 719         else                                            \
 720           mv .version .old_version;                     \
 721           expr 0$$(cat .old_version) + 1 >.version;     \
 722         fi;                                             \
 723         $(MAKE) $(build)=init
 724
 725 # Generate System.map
 726 quiet_cmd_sysmap = SYSMAP
 727       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 728
 729 # Link of vmlinux
 730 # If CONFIG_KALLSYMS is set .version is already updated
 731 # Generate System.map and verify that the content is consistent
 732 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 733 # First command is ':' to allow us to use + in front of the rule
 734 define rule_vmlinux__
 735         :
 736         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 737
 738         $(call cmd,vmlinux__)
 739         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 740
 741         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 742           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 743         $(cmd_sysmap) $@ System.map;                                         \
 744         if [ $$? -ne 0 ]; then                                               \
 745                 rm -f $@;                                                    \
 746                 /bin/false;                                                  \
 747         fi;
 748         $(verify_kallsyms)
 749 endef
 750
 751
 752 ifdef CONFIG_KALLSYMS
 753 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 754 # It's a three stage process:
 755 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 756 #   empty
 757 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 758 #   the right size - vmlinux version (uname -v) is updated during this step
 759 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 760 #   but due to the added section, some addresses have shifted.
 761 #   From here, we generate a correct .tmp_kallsyms2.o
 762 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 763 # o Verify that the System.map from vmlinux matches the map from
 764 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 765 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 766 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 767 #   temporary bypass to allow the kernel to be built while the
 768 #   maintainers work out what went wrong with kallsyms.
 769
 770 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 771 last_kallsyms := 3
 772 else
 773 last_kallsyms := 2
 774 endif
 775
 776 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 777
 778 define verify_kallsyms
 779         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 780           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 781           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 782         $(Q)cmp -s System.map .tmp_System.map ||                             \
 783                 (echo Inconsistent kallsyms data;                            \
 784                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 785                  rm .tmp_kallsyms* ; /bin/false )
 786 endef
 787
 788 # Update vmlinux version before link
 789 # Use + in front of this rule to silent warning about make -j1
 790 # First command is ':' to allow us to use + in front of this rule
 791 cmd_ksym_ld = $(cmd_vmlinux__)
 792 define rule_ksym_ld
 793         :
 794         +$(call cmd,vmlinux_version)
 795         $(call cmd,vmlinux__)
 796         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 797 endef
 798
 799 # Generate .S file with all kernel symbols
 800 quiet_cmd_kallsyms = KSYM    $@
 801       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 802                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 803
 804 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 805         $(call if_changed_dep,as_o_S)
 806
 807 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 808         $(call cmd,kallsyms)
 809
 810 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 811 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 812         $(call if_changed_rule,ksym_ld)
 813
 814 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 815         $(call if_changed,vmlinux__)
 816
 817 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 818         $(call if_changed,vmlinux__)
 819
 820 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 821 $(KALLSYMS): scripts ;
 822
 823 # Generate some data for debugging strange kallsyms problems
 824 debug_kallsyms: .tmp_map$(last_kallsyms)
 825
 826 .tmp_map%: .tmp_vmlinux% FORCE
 827         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 828
 829 .tmp_map3: .tmp_map2
 830
 831 .tmp_map2: .tmp_map1
 832
 833 endif # ifdef CONFIG_KALLSYMS
 834
 835 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 836 # relevant sections renamed as per the linker script.
 837 quiet_cmd_vmlinux-modpost = LD      $@
 838       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 839          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 840          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 841 define rule_vmlinux-modpost
 842         :
 843         +$(call cmd,vmlinux-modpost)
 844         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 845         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 846 endef
 847
 848 # vmlinux image - including updated kernel symbols
 849 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 850 ifdef CONFIG_HEADERS_CHECK
 851         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 852 endif
 853 ifdef CONFIG_SAMPLES
 854         $(Q)$(MAKE) $(build)=samples
 855 endif
 856 ifdef CONFIG_BUILD_DOCSRC
 857         $(Q)$(MAKE) $(build)=Documentation
 858 endif
 859         $(call vmlinux-modpost)
 860         $(call if_changed_rule,vmlinux__)
 861         $(Q)rm -f .old_version
 862
 863 # build vmlinux.o first to catch section mismatch errors early
 864 ifdef CONFIG_KALLSYMS
 865 .tmp_vmlinux1: vmlinux.o
 866 endif
 867
 868 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 869 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 870         $(call if_changed_rule,vmlinux-modpost)
 871
 872 # The actual objects are generated when descending,
 873 # make sure no implicit rule kicks in
 874 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 875
 876 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 877 # Preset locale variables to speed up the build process. Limit locale
 878 # tweaks to this spot to avoid wrong language settings when running
 879 # make menuconfig etc.
 880 # Error messages still appears in the original language
 881
 882 PHONY += $(vmlinux-dirs)
 883 $(vmlinux-dirs): prepare scripts
 884         $(Q)$(MAKE) $(build)=$@
 885 ifdef CONFIG_MODULES
 886         $(Q)$(MAKE) $(modbuiltin)=$@
 887 endif
 888
 889 # Build the kernel release string
 890 #
 891 # The KERNELRELEASE value built here is stored in the file
 892 # include/config/kernel.release, and is used when executing several
 893 # make targets, such as "make install" or "make modules_install."
 894 #
 895 # The eventual kernel release string consists of the following fields,
 896 # shown in a hierarchical format to show how smaller parts are concatenated
 897 # to form the larger and final value, with values coming from places like
 898 # the Makefile, kernel config options, make command line options and/or
 899 # SCM tag information.
 900 #
 901 #       $(KERNELVERSION)
 902 #         $(VERSION)                    eg, 2
 903 #         $(PATCHLEVEL)                 eg, 6
 904 #         $(SUBLEVEL)                   eg, 18
 905 #         $(EXTRAVERSION)               eg, -rc6
 906 #       $(localver-full)
 907 #         $(localver)
 908 #           localversion*               (files without backups, containing '~')
 909 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 910 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 911 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 912 #           $(LOCALVERSION)             (from make command line if provided)
 913 #
 914 #  Note how the final $(localver-auto) string is included *only* if the
 915 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 916 # moment, only git is supported but other SCMs can edit the script
 917 # scripts/setlocalversion and add the appropriate checks as needed.
 918
 919 pattern = ".*/localversion[^~]*"
 920 string  = $(shell cat /dev/null \
 921            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 922
 923 localver = $(subst $(space),, $(string) \
 924                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 925
 926 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 927 # and if the SCM is know a tag from the SCM is appended.
 928 # The appended tag is determined by the SCM used.
 929 #
 930 # .scmversion is used when generating rpm packages so we do not loose
 931 # the version information from the SCM when we do the build of the kernel
 932 # from the copied source
 933 ifdef CONFIG_LOCALVERSION_AUTO
 934
 935 ifeq ($(wildcard .scmversion),)
 936         _localver-auto = $(shell $(CONFIG_SHELL) \
 937                          $(srctree)/scripts/setlocalversion $(srctree))
 938 else
 939         _localver-auto = $(shell cat .scmversion 2> /dev/null)
 940 endif
 941
 942         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 943 endif
 944
 945 localver-full = $(localver)$(localver-auto)
 946
 947 # Store (new) KERNELRELASE string in include/config/kernel.release
 948 kernelrelease = $(KERNELVERSION)$(localver-full)
 949 include/config/kernel.release: include/config/auto.conf FORCE
 950         $(Q)rm -f $@
 951         $(Q)echo $(kernelrelease) > $@
 952
 953
 954 # Things we need to do before we recursively start building the kernel
 955 # or the modules are listed in "prepare".
 956 # A multi level approach is used. prepareN is processed before prepareN-1.
 957 # archprepare is used in arch Makefiles and when processed asm symlink,
 958 # version.h and scripts_basic is processed / created.
 959
 960 # Listed in dependency order
 961 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 962
 963 # prepare3 is used to check if we are building in a separate output directory,
 964 # and if so do:
 965 # 1) Check that make has not been executed in the kernel src $(srctree)
 966 prepare3: include/config/kernel.release
 967 ifneq ($(KBUILD_SRC),)
 968         @$(kecho) '  Using $(srctree) as source for kernel'
 969         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 970                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 971                 echo "  in the '$(srctree)' directory.";\
 972                 /bin/false; \
 973         fi;
 974 endif
 975
 976 # prepare2 creates a makefile if using a separate output directory
 977 prepare2: prepare3 outputmakefile
 978
 979 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 980                    include/config/auto.conf
 981         $(cmd_crmodverdir)
 982
 983 archprepare: prepare1 scripts_basic
 984
 985 prepare0: archprepare FORCE
 986         $(Q)$(MAKE) $(build)=.
 987         $(Q)$(MAKE) $(build)=. missing-syscalls
 988
 989 # All the preparing..
 990 prepare: prepare0
 991
 992 # Generate some files
 993 # ---------------------------------------------------------------------------
 994
 995 # KERNELRELEASE can change from a few different places, meaning version.h
 996 # needs to be updated, so this check is forced on all builds
 997
 998 uts_len := 64
 999 define filechk_utsrelease.h
1000         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1001           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1002           exit 1;                                                         \
1003         fi;                                                               \
1004         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1005 endef
1006
1007 define filechk_version.h
1008         (echo \#define LINUX_VERSION_CODE $(shell                             \
1009         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1010         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1011 endef
1012
1013 include/linux/version.h: $(srctree)/Makefile FORCE
1014         $(call filechk,version.h)
1015
1016 include/generated/utsrelease.h: include/config/kernel.release FORCE
1017         $(call filechk,utsrelease.h)
1018
1019 PHONY += headerdep
1020 headerdep:
1021         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1022
1023 # ---------------------------------------------------------------------------
1024
1025 PHONY += depend dep
1026 depend dep:
1027         @echo '*** Warning: make $@ is unnecessary now.'
1028
1029 # ---------------------------------------------------------------------------
1030 # Firmware install
1031 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1032 export INSTALL_FW_PATH
1033
1034 PHONY += firmware_install
1035 firmware_install: FORCE
1036         @mkdir -p $(objtree)/firmware
1037         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1038
1039 # ---------------------------------------------------------------------------
1040 # Kernel headers
1041
1042 #Default location for installed headers
1043 export INSTALL_HDR_PATH = $(objtree)/usr
1044
1045 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1046
1047 # If we do an all arch process set dst to asm-$(hdr-arch)
1048 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1049
1050 PHONY += __headers
1051 __headers: include/linux/version.h scripts_basic FORCE
1052         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1053
1054 PHONY += headers_install_all
1055 headers_install_all:
1056         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1057
1058 PHONY += headers_install
1059 headers_install: __headers
1060         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1061         $(error Headers not exportable for the $(SRCARCH) architecture))
1062         $(Q)$(MAKE) $(hdr-inst)=include
1063         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1064
1065 PHONY += headers_check_all
1066 headers_check_all: headers_install_all
1067         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1068
1069 PHONY += headers_check
1070 headers_check: headers_install
1071         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1072         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1073
1074 # ---------------------------------------------------------------------------
1075 # Modules
1076
1077 ifdef CONFIG_MODULES
1078
1079 # By default, build modules as well
1080
1081 all: modules
1082
1083 #       Build modules
1084 #
1085 #       A module can be listed more than once in obj-m resulting in
1086 #       duplicate lines in modules.order files.  Those are removed
1087 #       using awk while concatenating to the final file.
1088
1089 PHONY += modules
1090 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1091         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1092         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.builtin) > $(objtree)/modules.builtin
1093         @$(kecho) '  Building modules, stage 2.';
1094         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1095         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1096
1097
1098 # Target to prepare building external modules
1099 PHONY += modules_prepare
1100 modules_prepare: prepare scripts
1101
1102 # Target to install modules
1103 PHONY += modules_install
1104 modules_install: _modinst_ _modinst_post
1105
1106 PHONY += _modinst_
1107 _modinst_:
1108         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1109                 echo "Warning: you may need to install module-init-tools"; \
1110                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1111                 sleep 1; \
1112         fi
1113         @rm -rf $(MODLIB)/kernel
1114         @rm -f $(MODLIB)/source
1115         @mkdir -p $(MODLIB)/kernel
1116         @ln -s $(srctree) $(MODLIB)/source
1117         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1118                 rm -f $(MODLIB)/build ; \
1119                 ln -s $(objtree) $(MODLIB)/build ; \
1120         fi
1121         @cp -f $(objtree)/modules.order $(MODLIB)/
1122         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1123         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1124
1125 # This depmod is only for convenience to give the initial
1126 # boot a modules.dep even before / is mounted read-write.  However the
1127 # boot script depmod is the master version.
1128 PHONY += _modinst_post
1129 _modinst_post: _modinst_
1130         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1131         $(call cmd,depmod)
1132
1133 else # CONFIG_MODULES
1134
1135 # Modules not configured
1136 # ---------------------------------------------------------------------------
1137
1138 modules modules_install: FORCE
1139         @echo
1140         @echo "The present kernel configuration has modules disabled."
1141         @echo "Type 'make config' and enable loadable module support."
1142         @echo "Then build a kernel with module support enabled."
1143         @echo
1144         @exit 1
1145
1146 endif # CONFIG_MODULES
1147
1148 ###
1149 # Cleaning is done on three levels.
1150 # make clean     Delete most generated files
1151 #                Leave enough to build external modules
1152 # make mrproper  Delete the current configuration, and all generated files
1153 # make distclean Remove editor backup files, patch leftover files and the like
1154
1155 # Directories & files removed with 'make clean'
1156 CLEAN_DIRS  += $(MODVERDIR)
1157 CLEAN_FILES +=  vmlinux System.map \
1158                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1159
1160 # Directories & files removed with 'make mrproper'
1161 MRPROPER_DIRS  += include/config usr/include include/generated
1162 MRPROPER_FILES += .config .config.old .version .old_version             \
1163                   include/linux/version.h                               \
1164                   Module.symvers tags TAGS cscope*
1165
1166 # clean - Delete most, but leave enough to build external modules
1167 #
1168 clean: rm-dirs  := $(CLEAN_DIRS)
1169 clean: rm-files := $(CLEAN_FILES)
1170 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1171
1172 PHONY += $(clean-dirs) clean archclean
1173 $(clean-dirs):
1174         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1175
1176 clean: archclean $(clean-dirs)
1177         $(call cmd,rmdirs)
1178         $(call cmd,rmfiles)
1179         @find . $(RCS_FIND_IGNORE) \
1180                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1181                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1182                 -o -name '*.symtypes' -o -name 'modules.order' \
1183                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1184                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1185
1186 # mrproper - Delete all generated files, including .config
1187 #
1188 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1189 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1190 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1191
1192 PHONY += $(mrproper-dirs) mrproper archmrproper
1193 $(mrproper-dirs):
1194         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1195
1196 mrproper: clean archmrproper $(mrproper-dirs)
1197         $(call cmd,rmdirs)
1198         $(call cmd,rmfiles)
1199
1200 # distclean
1201 #
1202 PHONY += distclean
1203
1204 distclean: mrproper
1205         @find $(srctree) $(RCS_FIND_IGNORE) \
1206                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1207                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1208                 -o -name '.*.rej' -o -size 0 \
1209                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1210                 -type f -print | xargs rm -f
1211
1212
1213 # Packaging of the kernel to various formats
1214 # ---------------------------------------------------------------------------
1215 # rpm target kept for backward compatibility
1216 package-dir     := $(srctree)/scripts/package
1217
1218 %pkg: include/config/kernel.release FORCE
1219         $(Q)$(MAKE) $(build)=$(package-dir) $@
1220 rpm: include/config/kernel.release FORCE
1221         $(Q)$(MAKE) $(build)=$(package-dir) $@
1222
1223
1224 # Brief documentation of the typical targets used
1225 # ---------------------------------------------------------------------------
1226
1227 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1228 boards := $(notdir $(boards))
1229 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1230 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1231
1232 help:
1233         @echo  'Cleaning targets:'
1234         @echo  '  clean           - Remove most generated files but keep the config and'
1235         @echo  '                    enough build support to build external modules'
1236         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1237         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1238         @echo  ''
1239         @echo  'Configuration targets:'
1240         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1241         @echo  ''
1242         @echo  'Other generic targets:'
1243         @echo  '  all             - Build all targets marked with [*]'
1244         @echo  '* vmlinux         - Build the bare kernel'
1245         @echo  '* modules         - Build all modules'
1246         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1247         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1248         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1249         @echo  '  dir/            - Build all files in dir and below'
1250         @echo  '  dir/file.[ois]  - Build specified target only'
1251         @echo  '  dir/file.ko     - Build module including final link'
1252         @echo  '  modules_prepare - Set up for building external modules'
1253         @echo  '  tags/TAGS       - Generate tags file for editors'
1254         @echo  '  cscope          - Generate cscope index'
1255         @echo  '  kernelrelease   - Output the release version string'
1256         @echo  '  kernelversion   - Output the version stored in Makefile'
1257         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1258          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1259          echo  ''
1260         @echo  'Static analysers'
1261         @echo  '  checkstack      - Generate a list of stack hogs'
1262         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1263         @echo  '  versioncheck    - Sanity check on version.h usage'
1264         @echo  '  includecheck    - Check for duplicate included header files'
1265         @echo  '  export_report   - List the usages of all exported symbols'
1266         @echo  '  headers_check   - Sanity check on exported headers'
1267         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1268          echo  ''
1269         @echo  'Kernel packaging:'
1270         @$(MAKE) $(build)=$(package-dir) help
1271         @echo  ''
1272         @echo  'Documentation targets:'
1273         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1274         @echo  ''
1275         @echo  'Architecture specific targets ($(SRCARCH)):'
1276         @$(if $(archhelp),$(archhelp),\
1277                 echo '  No architecture specific help defined for $(SRCARCH)')
1278         @echo  ''
1279         @$(if $(boards), \
1280                 $(foreach b, $(boards), \
1281                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1282                 echo '')
1283         @$(if $(board-dirs), \
1284                 $(foreach b, $(board-dirs), \
1285                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1286                 printf "  %-16s - Show all of the above\\n" help-boards; \
1287                 echo '')
1288
1289         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1290         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1291         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1292         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1293         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1294         @echo  ''
1295         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1296         @echo  'For further info see the ./README file'
1297
1298
1299 help-board-dirs := $(addprefix help-,$(board-dirs))
1300
1301 help-boards: $(help-board-dirs)
1302
1303 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1304
1305 $(help-board-dirs): help-%:
1306         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1307         @$(if $(boards-per-dir), \
1308                 $(foreach b, $(boards-per-dir), \
1309                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1310                 echo '')
1311
1312
1313 # Documentation targets
1314 # ---------------------------------------------------------------------------
1315 %docs: scripts_basic FORCE
1316         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1317
1318 else # KBUILD_EXTMOD
1319
1320 ###
1321 # External module support.
1322 # When building external modules the kernel used as basis is considered
1323 # read-only, and no consistency checks are made and the make
1324 # system is not used on the basis kernel. If updates are required
1325 # in the basis kernel ordinary make commands (without M=...) must
1326 # be used.
1327 #
1328 # The following are the only valid targets when building external
1329 # modules.
1330 # make M=dir clean     Delete all automatically generated files
1331 # make M=dir modules   Make all modules in specified dir
1332 # make M=dir           Same as 'make M=dir modules'
1333 # make M=dir modules_install
1334 #                      Install the modules built in the module directory
1335 #                      Assumes install directory is already created
1336
1337 # We are always building modules
1338 KBUILD_MODULES := 1
1339 PHONY += crmodverdir
1340 crmodverdir:
1341         $(cmd_crmodverdir)
1342
1343 PHONY += $(objtree)/Module.symvers
1344 $(objtree)/Module.symvers:
1345         @test -e $(objtree)/Module.symvers || ( \
1346         echo; \
1347         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1348         echo "           is missing; modules will have no dependencies and modversions."; \
1349         echo )
1350
1351 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1352 PHONY += $(module-dirs) modules
1353 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1354         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1355
1356 modules: $(module-dirs)
1357         @$(kecho) '  Building modules, stage 2.';
1358         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1359
1360 PHONY += modules_install
1361 modules_install: _emodinst_ _emodinst_post
1362
1363 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1364 PHONY += _emodinst_
1365 _emodinst_:
1366         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1367         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1368
1369 PHONY += _emodinst_post
1370 _emodinst_post: _emodinst_
1371         $(call cmd,depmod)
1372
1373 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1374
1375 PHONY += $(clean-dirs) clean
1376 $(clean-dirs):
1377         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1378
1379 clean:  rm-dirs := $(MODVERDIR)
1380 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1381                    $(KBUILD_EXTMOD)/modules.order \
1382                    $(KBUILD_EXTMOD)/modules.builtin
1383 clean: $(clean-dirs)
1384         $(call cmd,rmdirs)
1385         $(call cmd,rmfiles)
1386         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1387                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1388                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1389                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1390
1391 help:
1392         @echo  '  Building external modules.'
1393         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1394         @echo  ''
1395         @echo  '  modules         - default target, build the module(s)'
1396         @echo  '  modules_install - install the module'
1397         @echo  '  clean           - remove generated files in module directory only'
1398         @echo  ''
1399
1400 # Dummies...
1401 PHONY += prepare scripts
1402 prepare: ;
1403 scripts: ;
1404 endif # KBUILD_EXTMOD
1405
1406 # Generate tags for editors
1407 # ---------------------------------------------------------------------------
1408 quiet_cmd_tags = GEN     $@
1409       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1410
1411 tags TAGS cscope: FORCE
1412         $(call cmd,tags)
1413
1414 # Scripts to check various things for consistency
1415 # ---------------------------------------------------------------------------
1416
1417 includecheck:
1418         find * $(RCS_FIND_IGNORE) \
1419                 -name '*.[hcS]' -type f -print | sort \
1420                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1421
1422 versioncheck:
1423         find * $(RCS_FIND_IGNORE) \
1424                 -name '*.[hcS]' -type f -print | sort \
1425                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1426
1427 namespacecheck:
1428         $(PERL) $(srctree)/scripts/namespace.pl
1429
1430 export_report:
1431         $(PERL) $(srctree)/scripts/export_report.pl
1432
1433 endif #ifeq ($(config-targets),1)
1434 endif #ifeq ($(mixed-targets),1)
1435
1436 PHONY += checkstack kernelrelease kernelversion
1437
1438 # UML needs a little special treatment here.  It wants to use the host
1439 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1440 # else wants $(ARCH), including people doing cross-builds, which means
1441 # that $(SUBARCH) doesn't work here.
1442 ifeq ($(ARCH), um)
1443 CHECKSTACK_ARCH := $(SUBARCH)
1444 else
1445 CHECKSTACK_ARCH := $(ARCH)
1446 endif
1447 checkstack:
1448         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1449         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1450
1451 kernelrelease:
1452         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1453         $(error kernelrelease not valid - run 'make prepare' to update it))
1454 kernelversion:
1455         @echo $(KERNELVERSION)
1456
1457 # Single targets
1458 # ---------------------------------------------------------------------------
1459 # Single targets are compatible with:
1460 # - build with mixed source and output
1461 # - build with separate output dir 'make O=...'
1462 # - external modules
1463 #
1464 #  target-dir => where to store outputfile
1465 #  build-dir  => directory in kernel source tree to use
1466
1467 ifeq ($(KBUILD_EXTMOD),)
1468         build-dir  = $(patsubst %/,%,$(dir $@))
1469         target-dir = $(dir $@)
1470 else
1471         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1472         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1473         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1474 endif
1475
1476 %.s: %.c prepare scripts FORCE
1477         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1478 %.i: %.c prepare scripts FORCE
1479         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1480 %.o: %.c prepare scripts FORCE
1481         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1482 %.lst: %.c prepare scripts FORCE
1483         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1484 %.s: %.S prepare scripts FORCE
1485         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1486 %.o: %.S prepare scripts FORCE
1487         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1488 %.symtypes: %.c prepare scripts FORCE
1489         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1490
1491 # Modules
1492 /: prepare scripts FORCE
1493         $(cmd_crmodverdir)
1494         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1495         $(build)=$(build-dir)
1496 %/: prepare scripts FORCE
1497         $(cmd_crmodverdir)
1498         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1499         $(build)=$(build-dir)
1500 %.ko: prepare scripts FORCE
1501         $(cmd_crmodverdir)
1502         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1503         $(build)=$(build-dir) $(@:.ko=.o)
1504         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1505
1506 # FIXME Should go into a make.lib or something
1507 # ===========================================================================
1508
1509 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1510       cmd_rmdirs = rm -rf $(rm-dirs)
1511
1512 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1513       cmd_rmfiles = rm -f $(rm-files)
1514
1515 # Run depmod only if we have System.map and depmod is executable
1516 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1517       cmd_depmod = \
1518         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1519                 $(DEPMOD) -ae -F System.map                                     \
1520                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1521                 $(KERNELRELEASE);                                               \
1522         fi
1523
1524 # Create temporary dir for module support files
1525 # clean it up only when building all modules
1526 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1527                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1528
1529 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1530           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1531           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1532
1533 quiet_cmd_as_o_S = AS      $@
1534 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1535
1536 # read all saved command lines
1537
1538 targets := $(wildcard $(sort $(targets)))
1539 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1540
1541 ifneq ($(cmd_files),)
1542   $(cmd_files): ;       # Do not try to update included dependency files
1543   include $(cmd_files)
1544 endif
1545
1546 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1547 # Usage:
1548 # $(Q)$(MAKE) $(clean)=dir
1549 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1550
1551 endif   # skip-makefile
1552
1553 PHONY += FORCE
1554 FORCE:
1555
1556 # Declare the contents of the .PHONY variable as phony.  We keep that
1557 # information in a variable so we can use it in if_changed and friends.
1558 .PHONY: $(PHONY)