Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 38
   4 EXTRAVERSION = .8
   5 NAME = Flesh-Eating Bats with Fangs
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # Do not:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoids hard-to-debug behaviour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # Avoid funny character set dependencies
  20 unexport LC_ALL
  21 LC_COLLATE=C
  22 LC_NUMERIC=C
  23 export LC_COLLATE LC_NUMERIC
  24
  25 # We are using a recursive build, so we need to do a little thinking
  26 # to get the ordering right.
  27 #
  28 # Most importantly: sub-Makefiles should only ever modify files in
  29 # their own directory. If in some directory we have a dependency on
  30 # a file in another dir (which doesn't happen often, but it's often
  31 # unavoidable when linking the built-in.o targets which finally
  32 # turn into vmlinux), we will call a sub make in that other dir, and
  33 # after that we are sure that everything which is in that other dir
  34 # is now up to date.
  35 #
  36 # The only cases where we need to modify files which have global
  37 # effects are thus separated out and done before the recursive
  38 # descending is started. They are now explicitly listed as the
  39 # prepare rule.
  40
  41 # To put more focus on warnings, be less verbose as default
  42 # Use 'make V=1' to see the full commands
  43
  44 ifeq ("$(origin V)", "command line")
  45   KBUILD_VERBOSE = $(V)
  46 endif
  47 ifndef KBUILD_VERBOSE
  48   KBUILD_VERBOSE = 0
  49 endif
  50
  51 # Call a source code checker (by default, "sparse") as part of the
  52 # C compilation.
  53 #
  54 # Use 'make C=1' to enable checking of only re-compiled files.
  55 # Use 'make C=2' to enable checking of *all* source files, regardless
  56 # of whether they are re-compiled or not.
  57 #
  58 # See the file "Documentation/sparse.txt" for more details, including
  59 # where to get the "sparse" utility.
  60
  61 ifeq ("$(origin C)", "command line")
  62   KBUILD_CHECKSRC = $(C)
  63 endif
  64 ifndef KBUILD_CHECKSRC
  65   KBUILD_CHECKSRC = 0
  66 endif
  67
  68 # Use make M=dir to specify directory of external module to build
  69 # Old syntax make ... SUBDIRS=$PWD is still supported
  70 # Setting the environment variable KBUILD_EXTMOD take precedence
  71 ifdef SUBDIRS
  72   KBUILD_EXTMOD ?= $(SUBDIRS)
  73 endif
  74
  75 ifeq ("$(origin M)", "command line")
  76   KBUILD_EXTMOD := $(M)
  77 endif
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(KBUILD_SRC),)
  98
  99 # OK, Make called in directory where kernel src resides
 100 # Do we want to locate output files in a separate directory?
 101 ifeq ("$(origin O)", "command line")
 102   KBUILD_OUTPUT := $(O)
 103 endif
 104
 105 # That's our default target when none is given on the command line
 106 PHONY := _all
 107 _all:
 108
 109 # Cancel implicit rules on top Makefile
 110 $(CURDIR)/Makefile Makefile: ;
 111
 112 ifneq ($(KBUILD_OUTPUT),)
 113 # Invoke a second make in the output directory, passing relevant variables
 114 # check that the output directory actually exists
 115 saved-output := $(KBUILD_OUTPUT)
 116 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 117 $(if $(KBUILD_OUTPUT),, \
 118      $(error output directory "$(saved-output)" does not exist))
 119
 120 PHONY += $(MAKECMDGOALS) sub-make
 121
 122 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 123         $(Q)@:
 124
 125 sub-make: FORCE
 126         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 127         KBUILD_SRC=$(CURDIR) \
 128         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 129         $(filter-out _all sub-make,$(MAKECMDGOALS))
 130
 131 # Leave processing to above invocation of make
 132 skip-makefile := 1
 133 endif # ifneq ($(KBUILD_OUTPUT),)
 134 endif # ifeq ($(KBUILD_SRC),)
 135
 136 # We process the rest of the Makefile if this is the final invocation of make
 137 ifeq ($(skip-makefile),)
 138
 139 # If building an external module we do not care about the all: rule
 140 # but instead _all depend on modules
 141 PHONY += all
 142 ifeq ($(KBUILD_EXTMOD),)
 143 _all: all
 144 else
 145 _all: modules
 146 endif
 147
 148 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 149 objtree         := $(CURDIR)
 150 src             := $(srctree)
 151 obj             := $(objtree)
 152
 153 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 154
 155 export srctree objtree VPATH
 156
 157
 158 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 159 # first, and if a usermode build is happening, the "ARCH=um" on the command
 160 # line overrides the setting of ARCH below.  If a native build is happening,
 161 # then ARCH is assigned, getting whatever value it gets normally, and
 162 # SUBARCH is subsequently ignored.
 163
 164 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 165                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 166                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 167                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 168                                   -e s/sh[234].*/sh/ )
 169
 170 # Cross compiling and selecting different set of gcc/bin-utils
 171 # ---------------------------------------------------------------------------
 172 #
 173 # When performing cross compilation for other architectures ARCH shall be set
 174 # to the target architecture. (See arch/* for the possibilities).
 175 # ARCH can be set during invocation of make:
 176 # make ARCH=ia64
 177 # Another way is to have ARCH set in the environment.
 178 # The default ARCH is the host where make is executed.
 179
 180 # CROSS_COMPILE specify the prefix used for all executables used
 181 # during compilation. Only gcc and related bin-utils executables
 182 # are prefixed with $(CROSS_COMPILE).
 183 # CROSS_COMPILE can be set on the command line
 184 # make CROSS_COMPILE=ia64-linux-
 185 # Alternatively CROSS_COMPILE can be set in the environment.
 186 # A third alternative is to store a setting in .config so that plain
 187 # "make" in the configured kernel build directory always uses that.
 188 # Default value for CROSS_COMPILE is not to prefix executables
 189 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 190 export KBUILD_BUILDHOST := $(SUBARCH)
 191 ARCH            ?= $(SUBARCH)
 192 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 193
 194 # Architecture as present in compile.h
 195 UTS_MACHINE     := $(ARCH)
 196 SRCARCH         := $(ARCH)
 197
 198 # Additional ARCH settings for x86
 199 ifeq ($(ARCH),i386)
 200         SRCARCH := x86
 201 endif
 202 ifeq ($(ARCH),x86_64)
 203         SRCARCH := x86
 204 endif
 205
 206 # Additional ARCH settings for sparc
 207 ifeq ($(ARCH),sparc32)
 208        SRCARCH := sparc
 209 endif
 210 ifeq ($(ARCH),sparc64)
 211        SRCARCH := sparc
 212 endif
 213
 214 # Additional ARCH settings for sh
 215 ifeq ($(ARCH),sh64)
 216        SRCARCH := sh
 217 endif
 218
 219 # Where to locate arch specific headers
 220 hdr-arch  := $(SRCARCH)
 221
 222 ifeq ($(ARCH),m68knommu)
 223        hdr-arch  := m68k
 224 endif
 225
 226 KCONFIG_CONFIG  ?= .config
 227 export KCONFIG_CONFIG
 228
 229 # SHELL used by kbuild
 230 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 231           else if [ -x /bin/bash ]; then echo /bin/bash; \
 232           else echo sh; fi ; fi)
 233
 234 HOSTCC       = gcc
 235 HOSTCXX      = g++
 236 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 237 HOSTCXXFLAGS = -O2
 238
 239 # Decide whether to build built-in, modular, or both.
 240 # Normally, just do built-in.
 241
 242 KBUILD_MODULES :=
 243 KBUILD_BUILTIN := 1
 244
 245 #       If we have only "make modules", don't compile built-in objects.
 246 #       When we're building modules with modversions, we need to consider
 247 #       the built-in objects during the descend as well, in order to
 248 #       make sure the checksums are up to date before we record them.
 249
 250 ifeq ($(MAKECMDGOALS),modules)
 251   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 252 endif
 253
 254 #       If we have "make <whatever> modules", compile modules
 255 #       in addition to whatever we do anyway.
 256 #       Just "make" or "make all" shall build modules as well
 257
 258 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 259   KBUILD_MODULES := 1
 260 endif
 261
 262 ifeq ($(MAKECMDGOALS),)
 263   KBUILD_MODULES := 1
 264 endif
 265
 266 export KBUILD_MODULES KBUILD_BUILTIN
 267 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 268
 269 # Beautify output
 270 # ---------------------------------------------------------------------------
 271 #
 272 # Normally, we echo the whole command before executing it. By making
 273 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 274 # $(quiet) to choose other forms of output instead, e.g.
 275 #
 276 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 277 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 278 #
 279 # If $(quiet) is empty, the whole command will be printed.
 280 # If it is set to "quiet_", only the short version will be printed.
 281 # If it is set to "silent_", nothing will be printed at all, since
 282 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 283 #
 284 # A simple variant is to prefix commands with $(Q) - that's useful
 285 # for commands that shall be hidden in non-verbose mode.
 286 #
 287 #       $(Q)ln $@ :<
 288 #
 289 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 290 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 291
 292 ifeq ($(KBUILD_VERBOSE),1)
 293   quiet =
 294   Q =
 295 else
 296   quiet=quiet_
 297   Q = @
 298 endif
 299
 300 # If the user is running make -s (silent mode), suppress echoing of
 301 # commands
 302
 303 ifneq ($(findstring s,$(MAKEFLAGS)),)
 304   quiet=silent_
 305 endif
 306
 307 export quiet Q KBUILD_VERBOSE
 308
 309
 310 # Look for make include files relative to root of kernel src
 311 MAKEFLAGS += --include-dir=$(srctree)
 312
 313 # We need some generic definitions (do not try to remake the file).
 314 $(srctree)/scripts/Kbuild.include: ;
 315 include $(srctree)/scripts/Kbuild.include
 316
 317 # Make variables (CC, etc...)
 318
 319 AS              = $(CROSS_COMPILE)as
 320 LD              = $(CROSS_COMPILE)ld
 321 CC              = $(CROSS_COMPILE)gcc
 322 CPP             = $(CC) -E
 323 AR              = $(CROSS_COMPILE)ar
 324 NM              = $(CROSS_COMPILE)nm
 325 STRIP           = $(CROSS_COMPILE)strip
 326 OBJCOPY         = $(CROSS_COMPILE)objcopy
 327 OBJDUMP         = $(CROSS_COMPILE)objdump
 328 AWK             = awk
 329 GENKSYMS        = scripts/genksyms/genksyms
 330 INSTALLKERNEL  := installkernel
 331 DEPMOD          = /sbin/depmod
 332 KALLSYMS        = scripts/kallsyms
 333 PERL            = perl
 334 CHECK           = sparse
 335
 336 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 337                   -Wbitwise -Wno-return-void $(CF)
 338 CFLAGS_MODULE   =
 339 AFLAGS_MODULE   =
 340 LDFLAGS_MODULE  =
 341 CFLAGS_KERNEL   =
 342 AFLAGS_KERNEL   =
 343 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 344
 345
 346 # Use LINUXINCLUDE when you must reference the include/ directory.
 347 # Needed to be compatible with the O= option
 348 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 349                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 350                    -include include/generated/autoconf.h
 351
 352 KBUILD_CPPFLAGS := -D__KERNEL__
 353
 354 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 355                    -fno-strict-aliasing -fno-common \
 356                    -Werror-implicit-function-declaration \
 357                    -Wno-format-security \
 358                    -fno-delete-null-pointer-checks
 359 KBUILD_AFLAGS_KERNEL :=
 360 KBUILD_CFLAGS_KERNEL :=
 361 KBUILD_AFLAGS   := -D__ASSEMBLY__
 362 KBUILD_AFLAGS_MODULE  := -DMODULE
 363 KBUILD_CFLAGS_MODULE  := -DMODULE
 364 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 365
 366 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 367 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 368 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 369
 370 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 371 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 372 export CPP AR NM STRIP OBJCOPY OBJDUMP
 373 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 374 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 375
 376 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 377 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 378 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 379 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 380 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 381
 382 # When compiling out-of-tree modules, put MODVERDIR in the module
 383 # tree rather than in the kernel tree. The kernel tree might
 384 # even be read-only.
 385 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 386
 387 # Files to ignore in find ... statements
 388
 389 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
 390 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 391
 392 # ===========================================================================
 393 # Rules shared between *config targets and build targets
 394
 395 # Basic helpers built in scripts/
 396 PHONY += scripts_basic
 397 scripts_basic:
 398         $(Q)$(MAKE) $(build)=scripts/basic
 399         $(Q)rm -f .tmp_quiet_recordmcount
 400
 401 # To avoid any implicit rule to kick in, define an empty command.
 402 scripts/basic/%: scripts_basic ;
 403
 404 PHONY += outputmakefile
 405 # outputmakefile generates a Makefile in the output directory, if using a
 406 # separate output directory. This allows convenient use of make in the
 407 # output directory.
 408 outputmakefile:
 409 ifneq ($(KBUILD_SRC),)
 410         $(Q)ln -fsn $(srctree) source
 411         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 412             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 413 endif
 414
 415 # To make sure we do not include .config for any of the *config targets
 416 # catch them early, and hand them over to scripts/kconfig/Makefile
 417 # It is allowed to specify more targets when calling make, including
 418 # mixing *config targets and build targets.
 419 # For example 'make oldconfig all'.
 420 # Detect when mixed targets is specified, and make a second invocation
 421 # of make so .config is not included in this case either (for *config).
 422
 423 no-dot-config-targets := clean mrproper distclean \
 424                          cscope TAGS tags help %docs check% coccicheck \
 425                          include/linux/version.h headers_% \
 426                          kernelversion %src-pkg
 427
 428 config-targets := 0
 429 mixed-targets  := 0
 430 dot-config     := 1
 431
 432 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 433         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 434                 dot-config := 0
 435         endif
 436 endif
 437
 438 ifeq ($(KBUILD_EXTMOD),)
 439         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 440                 config-targets := 1
 441                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 442                         mixed-targets := 1
 443                 endif
 444         endif
 445 endif
 446
 447 ifeq ($(mixed-targets),1)
 448 # ===========================================================================
 449 # We're called with mixed targets (*config and build targets).
 450 # Handle them one by one.
 451
 452 %:: FORCE
 453         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 454
 455 else
 456 ifeq ($(config-targets),1)
 457 # ===========================================================================
 458 # *config targets only - make sure prerequisites are updated, and descend
 459 # in scripts/kconfig to make the *config target
 460
 461 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 462 # KBUILD_DEFCONFIG may point out an alternative default configuration
 463 # used for 'make defconfig'
 464 include $(srctree)/arch/$(SRCARCH)/Makefile
 465 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 466
 467 config: scripts_basic outputmakefile FORCE
 468         $(Q)mkdir -p include/linux include/config
 469         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 470
 471 %config: scripts_basic outputmakefile FORCE
 472         $(Q)mkdir -p include/linux include/config
 473         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 474
 475 else
 476 # ===========================================================================
 477 # Build targets only - this includes vmlinux, arch specific targets, clean
 478 # targets and others. In general all targets except *config targets.
 479
 480 ifeq ($(KBUILD_EXTMOD),)
 481 # Additional helpers built in scripts/
 482 # Carefully list dependencies so we do not try to build scripts twice
 483 # in parallel
 484 PHONY += scripts
 485 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 486         $(Q)$(MAKE) $(build)=$(@)
 487
 488 # Objects we will link into vmlinux / subdirs we need to visit
 489 init-y          := init/
 490 drivers-y       := drivers/ sound/ firmware/
 491 net-y           := net/
 492 libs-y          := lib/
 493 core-y          := usr/
 494 endif # KBUILD_EXTMOD
 495
 496 ifeq ($(dot-config),1)
 497 # Read in config
 498 -include include/config/auto.conf
 499
 500 ifeq ($(KBUILD_EXTMOD),)
 501 # Read in dependencies to all Kconfig* files, make sure to run
 502 # oldconfig if changes are detected.
 503 -include include/config/auto.conf.cmd
 504
 505 # To avoid any implicit rule to kick in, define an empty command
 506 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 507
 508 # If .config is newer than include/config/auto.conf, someone tinkered
 509 # with it and forgot to run make oldconfig.
 510 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 511 # we execute the config step to be sure to catch updated Kconfig files
 512 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 513         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 514 else
 515 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 516 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 517 PHONY += include/config/auto.conf
 518
 519 include/config/auto.conf:
 520         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 521         echo;                                                           \
 522         echo "  ERROR: Kernel configuration is invalid.";               \
 523         echo "         include/generated/autoconf.h or $@ are missing.";\
 524         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 525         echo;                                                           \
 526         /bin/false)
 527
 528 endif # KBUILD_EXTMOD
 529
 530 else
 531 # Dummy target needed, because used as prerequisite
 532 include/config/auto.conf: ;
 533 endif # $(dot-config)
 534
 535 # The all: target is the default when no target is given on the
 536 # command line.
 537 # This allow a user to issue only 'make' to build a kernel including modules
 538 # Defaults to vmlinux, but the arch makefile usually adds further targets
 539 all: vmlinux
 540
 541 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 542 KBUILD_CFLAGS   += -Os
 543 else
 544 KBUILD_CFLAGS   += -O2
 545 endif
 546
 547 include $(srctree)/arch/$(SRCARCH)/Makefile
 548
 549 ifneq ($(CONFIG_FRAME_WARN),0)
 550 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 551 endif
 552
 553 # Force gcc to behave correct even for buggy distributions
 554 ifndef CONFIG_CC_STACKPROTECTOR
 555 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 556 endif
 557
 558 ifdef CONFIG_FRAME_POINTER
 559 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 560 else
 561 # Some targets (ARM with Thumb2, for example), can't be built with frame
 562 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 563 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 564 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 565 # -fomit-frame-pointer with FUNCTION_TRACER.
 566 ifndef CONFIG_FUNCTION_TRACER
 567 KBUILD_CFLAGS   += -fomit-frame-pointer
 568 endif
 569 endif
 570
 571 ifdef CONFIG_DEBUG_INFO
 572 KBUILD_CFLAGS   += -g
 573 KBUILD_AFLAGS   += -gdwarf-2
 574 endif
 575
 576 ifdef CONFIG_DEBUG_INFO_REDUCED
 577 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 578 endif
 579
 580 ifdef CONFIG_FUNCTION_TRACER
 581 KBUILD_CFLAGS   += -pg
 582 ifdef CONFIG_DYNAMIC_FTRACE
 583         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 584                 BUILD_C_RECORDMCOUNT := y
 585                 export BUILD_C_RECORDMCOUNT
 586         endif
 587 endif
 588 endif
 589
 590 # We trigger additional mismatches with less inlining
 591 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 592 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 593 endif
 594
 595 # arch Makefile may override CC so keep this after arch Makefile is included
 596 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 597 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 598
 599 # warn about C99 declaration after statement
 600 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 601
 602 # disable pointer signed / unsigned warnings in gcc 4.0
 603 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 604
 605 # disable invalid "can't wrap" optimizations for signed / pointers
 606 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 607
 608 # conserve stack if available
 609 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 610
 611 # check for 'asm goto'
 612 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 613         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 614 endif
 615
 616 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 617 # But warn user when we do so
 618 warn-assign = \
 619 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 620
 621 ifneq ($(KCPPFLAGS),)
 622         $(call warn-assign,CPPFLAGS)
 623         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 624 endif
 625 ifneq ($(KAFLAGS),)
 626         $(call warn-assign,AFLAGS)
 627         KBUILD_AFLAGS += $(KAFLAGS)
 628 endif
 629 ifneq ($(KCFLAGS),)
 630         $(call warn-assign,CFLAGS)
 631         KBUILD_CFLAGS += $(KCFLAGS)
 632 endif
 633
 634 # Use --build-id when available.
 635 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 636                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 637 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 638 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 639
 640 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 641 LDFLAGS_vmlinux += $(call ld-option, -X,)
 642 endif
 643
 644 # Default kernel image to build when no specific target is given.
 645 # KBUILD_IMAGE may be overruled on the command line or
 646 # set in the environment
 647 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 648 # this default value
 649 export KBUILD_IMAGE ?= vmlinux
 650
 651 #
 652 # INSTALL_PATH specifies where to place the updated kernel and system map
 653 # images. Default is /boot, but you can set it to other values
 654 export  INSTALL_PATH ?= /boot
 655
 656 #
 657 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 658 # relocations required by build roots.  This is not defined in the
 659 # makefile but the argument can be passed to make if needed.
 660 #
 661
 662 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 663 export MODLIB
 664
 665 #
 666 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 667 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 668 #  the default option --strip-debug will be used.  Otherwise,
 669 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 670
 671 ifdef INSTALL_MOD_STRIP
 672 ifeq ($(INSTALL_MOD_STRIP),1)
 673 mod_strip_cmd = $(STRIP) --strip-debug
 674 else
 675 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 676 endif # INSTALL_MOD_STRIP=1
 677 else
 678 mod_strip_cmd = true
 679 endif # INSTALL_MOD_STRIP
 680 export mod_strip_cmd
 681
 682
 683 ifeq ($(KBUILD_EXTMOD),)
 684 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 685
 686 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 687                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 688                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 689
 690 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 691                      $(init-n) $(init-) \
 692                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 693                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 694
 695 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 696 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 697 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 698 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 699 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 700 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 701 libs-y          := $(libs-y1) $(libs-y2)
 702
 703 # Build vmlinux
 704 # ---------------------------------------------------------------------------
 705 # vmlinux is built from the objects selected by $(vmlinux-init) and
 706 # $(vmlinux-main). Most are built-in.o files from top-level directories
 707 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 708 # Ordering when linking is important, and $(vmlinux-init) must be first.
 709 #
 710 # vmlinux
 711 #   ^
 712 #   |
 713 #   +-< $(vmlinux-init)
 714 #   |   +--< init/version.o + more
 715 #   |
 716 #   +--< $(vmlinux-main)
 717 #   |    +--< driver/built-in.o mm/built-in.o + more
 718 #   |
 719 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 720 #
 721 # vmlinux version (uname -v) cannot be updated during normal
 722 # descending-into-subdirs phase since we do not yet know if we need to
 723 # update vmlinux.
 724 # Therefore this step is delayed until just before final link of vmlinux -
 725 # except in the kallsyms case where it is done just before adding the
 726 # symbols to the kernel.
 727 #
 728 # System.map is generated to document addresses of all kernel symbols
 729
 730 vmlinux-init := $(head-y) $(init-y)
 731 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 732 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 733 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 734 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 735
 736 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 737 # May be overridden by arch/$(ARCH)/Makefile
 738 quiet_cmd_vmlinux__ ?= LD      $@
 739       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 740       -T $(vmlinux-lds) $(vmlinux-init)                          \
 741       --start-group $(vmlinux-main) --end-group                  \
 742       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 743
 744 # Generate new vmlinux version
 745 quiet_cmd_vmlinux_version = GEN     .version
 746       cmd_vmlinux_version = set -e;                     \
 747         if [ ! -r .version ]; then                      \
 748           rm -f .version;                               \
 749           echo 1 >.version;                             \
 750         else                                            \
 751           mv .version .old_version;                     \
 752           expr 0$$(cat .old_version) + 1 >.version;     \
 753         fi;                                             \
 754         $(MAKE) $(build)=init
 755
 756 # Generate System.map
 757 quiet_cmd_sysmap = SYSMAP
 758       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 759
 760 # Link of vmlinux
 761 # If CONFIG_KALLSYMS is set .version is already updated
 762 # Generate System.map and verify that the content is consistent
 763 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 764 # First command is ':' to allow us to use + in front of the rule
 765 define rule_vmlinux__
 766         :
 767         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 768
 769         $(call cmd,vmlinux__)
 770         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 771
 772         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 773           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 774         $(cmd_sysmap) $@ System.map;                                         \
 775         if [ $$? -ne 0 ]; then                                               \
 776                 rm -f $@;                                                    \
 777                 /bin/false;                                                  \
 778         fi;
 779         $(verify_kallsyms)
 780 endef
 781
 782
 783 ifdef CONFIG_KALLSYMS
 784 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 785 # It's a three stage process:
 786 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 787 #   empty
 788 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 789 #   the right size - vmlinux version (uname -v) is updated during this step
 790 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 791 #   but due to the added section, some addresses have shifted.
 792 #   From here, we generate a correct .tmp_kallsyms2.o
 793 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 794 # o Verify that the System.map from vmlinux matches the map from
 795 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 796 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 797 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 798 #   temporary bypass to allow the kernel to be built while the
 799 #   maintainers work out what went wrong with kallsyms.
 800
 801 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 802 last_kallsyms := 3
 803 else
 804 last_kallsyms := 2
 805 endif
 806
 807 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 808
 809 define verify_kallsyms
 810         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 811           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 812           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 813         $(Q)cmp -s System.map .tmp_System.map ||                             \
 814                 (echo Inconsistent kallsyms data;                            \
 815                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 816                  rm .tmp_kallsyms* ; /bin/false )
 817 endef
 818
 819 # Update vmlinux version before link
 820 # Use + in front of this rule to silent warning about make -j1
 821 # First command is ':' to allow us to use + in front of this rule
 822 cmd_ksym_ld = $(cmd_vmlinux__)
 823 define rule_ksym_ld
 824         :
 825         +$(call cmd,vmlinux_version)
 826         $(call cmd,vmlinux__)
 827         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 828 endef
 829
 830 # Generate .S file with all kernel symbols
 831 quiet_cmd_kallsyms = KSYM    $@
 832       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 833                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 834
 835 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 836         $(call if_changed_dep,as_o_S)
 837
 838 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 839         $(call cmd,kallsyms)
 840
 841 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 842 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 843         $(call if_changed_rule,ksym_ld)
 844
 845 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 846         $(call if_changed,vmlinux__)
 847
 848 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 849         $(call if_changed,vmlinux__)
 850
 851 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 852 $(KALLSYMS): scripts ;
 853
 854 # Generate some data for debugging strange kallsyms problems
 855 debug_kallsyms: .tmp_map$(last_kallsyms)
 856
 857 .tmp_map%: .tmp_vmlinux% FORCE
 858         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 859
 860 .tmp_map3: .tmp_map2
 861
 862 .tmp_map2: .tmp_map1
 863
 864 endif # ifdef CONFIG_KALLSYMS
 865
 866 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 867 # relevant sections renamed as per the linker script.
 868 quiet_cmd_vmlinux-modpost = LD      $@
 869       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 870          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 871          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 872 define rule_vmlinux-modpost
 873         :
 874         +$(call cmd,vmlinux-modpost)
 875         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 876         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 877 endef
 878
 879 # vmlinux image - including updated kernel symbols
 880 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 881 ifdef CONFIG_HEADERS_CHECK
 882         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 883 endif
 884 ifdef CONFIG_SAMPLES
 885         $(Q)$(MAKE) $(build)=samples
 886 endif
 887 ifdef CONFIG_BUILD_DOCSRC
 888         $(Q)$(MAKE) $(build)=Documentation
 889 endif
 890         $(call vmlinux-modpost)
 891         $(call if_changed_rule,vmlinux__)
 892         $(Q)rm -f .old_version
 893
 894 # build vmlinux.o first to catch section mismatch errors early
 895 ifdef CONFIG_KALLSYMS
 896 .tmp_vmlinux1: vmlinux.o
 897 endif
 898
 899 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 900 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 901         $(call if_changed_rule,vmlinux-modpost)
 902
 903 # The actual objects are generated when descending,
 904 # make sure no implicit rule kicks in
 905 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 906
 907 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 908 # Preset locale variables to speed up the build process. Limit locale
 909 # tweaks to this spot to avoid wrong language settings when running
 910 # make menuconfig etc.
 911 # Error messages still appears in the original language
 912
 913 PHONY += $(vmlinux-dirs)
 914 $(vmlinux-dirs): prepare scripts
 915         $(Q)$(MAKE) $(build)=$@
 916
 917 # Store (new) KERNELRELASE string in include/config/kernel.release
 918 include/config/kernel.release: include/config/auto.conf FORCE
 919         $(Q)rm -f $@
 920         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 921
 922
 923 # Things we need to do before we recursively start building the kernel
 924 # or the modules are listed in "prepare".
 925 # A multi level approach is used. prepareN is processed before prepareN-1.
 926 # archprepare is used in arch Makefiles and when processed asm symlink,
 927 # version.h and scripts_basic is processed / created.
 928
 929 # Listed in dependency order
 930 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 931
 932 # prepare3 is used to check if we are building in a separate output directory,
 933 # and if so do:
 934 # 1) Check that make has not been executed in the kernel src $(srctree)
 935 prepare3: include/config/kernel.release
 936 ifneq ($(KBUILD_SRC),)
 937         @$(kecho) '  Using $(srctree) as source for kernel'
 938         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 939                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 940                 echo "  in the '$(srctree)' directory.";\
 941                 /bin/false; \
 942         fi;
 943 endif
 944
 945 # prepare2 creates a makefile if using a separate output directory
 946 prepare2: prepare3 outputmakefile
 947
 948 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 949                    include/config/auto.conf
 950         $(cmd_crmodverdir)
 951
 952 archprepare: prepare1 scripts_basic
 953
 954 prepare0: archprepare FORCE
 955         $(Q)$(MAKE) $(build)=.
 956         $(Q)$(MAKE) $(build)=. missing-syscalls
 957
 958 # All the preparing..
 959 prepare: prepare0
 960
 961 # Generate some files
 962 # ---------------------------------------------------------------------------
 963
 964 # KERNELRELEASE can change from a few different places, meaning version.h
 965 # needs to be updated, so this check is forced on all builds
 966
 967 uts_len := 64
 968 define filechk_utsrelease.h
 969         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 970           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 971           exit 1;                                                         \
 972         fi;                                                               \
 973         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 974 endef
 975
 976 define filechk_version.h
 977         (echo \#define LINUX_VERSION_CODE $(shell                             \
 978         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 979         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 980 endef
 981
 982 include/linux/version.h: $(srctree)/Makefile FORCE
 983         $(call filechk,version.h)
 984
 985 include/generated/utsrelease.h: include/config/kernel.release FORCE
 986         $(call filechk,utsrelease.h)
 987
 988 PHONY += headerdep
 989 headerdep:
 990         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
 991
 992 # ---------------------------------------------------------------------------
 993
 994 PHONY += depend dep
 995 depend dep:
 996         @echo '*** Warning: make $@ is unnecessary now.'
 997
 998 # ---------------------------------------------------------------------------
 999 # Firmware install
1000 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1001 export INSTALL_FW_PATH
1002
1003 PHONY += firmware_install
1004 firmware_install: FORCE
1005         @mkdir -p $(objtree)/firmware
1006         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1007
1008 # ---------------------------------------------------------------------------
1009 # Kernel headers
1010
1011 #Default location for installed headers
1012 export INSTALL_HDR_PATH = $(objtree)/usr
1013
1014 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1015
1016 # If we do an all arch process set dst to asm-$(hdr-arch)
1017 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1018
1019 PHONY += __headers
1020 __headers: include/linux/version.h scripts_basic FORCE
1021         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1022
1023 PHONY += headers_install_all
1024 headers_install_all:
1025         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1026
1027 PHONY += headers_install
1028 headers_install: __headers
1029         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1030         $(error Headers not exportable for the $(SRCARCH) architecture))
1031         $(Q)$(MAKE) $(hdr-inst)=include
1032         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1033
1034 PHONY += headers_check_all
1035 headers_check_all: headers_install_all
1036         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1037
1038 PHONY += headers_check
1039 headers_check: headers_install
1040         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1041         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1042
1043 # ---------------------------------------------------------------------------
1044 # Modules
1045
1046 ifdef CONFIG_MODULES
1047
1048 # By default, build modules as well
1049
1050 all: modules
1051
1052 #       Build modules
1053 #
1054 #       A module can be listed more than once in obj-m resulting in
1055 #       duplicate lines in modules.order files.  Those are removed
1056 #       using awk while concatenating to the final file.
1057
1058 PHONY += modules
1059 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1060         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1061         @$(kecho) '  Building modules, stage 2.';
1062         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1063         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1064
1065 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1066         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1067
1068 %/modules.builtin: include/config/auto.conf
1069         $(Q)$(MAKE) $(modbuiltin)=$*
1070
1071
1072 # Target to prepare building external modules
1073 PHONY += modules_prepare
1074 modules_prepare: prepare scripts
1075
1076 # Target to install modules
1077 PHONY += modules_install
1078 modules_install: _modinst_ _modinst_post
1079
1080 PHONY += _modinst_
1081 _modinst_:
1082         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1083                 echo "Warning: you may need to install module-init-tools"; \
1084                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1085                 sleep 1; \
1086         fi
1087         @rm -rf $(MODLIB)/kernel
1088         @rm -f $(MODLIB)/source
1089         @mkdir -p $(MODLIB)/kernel
1090         @ln -s $(srctree) $(MODLIB)/source
1091         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1092                 rm -f $(MODLIB)/build ; \
1093                 ln -s $(objtree) $(MODLIB)/build ; \
1094         fi
1095         @cp -f $(objtree)/modules.order $(MODLIB)/
1096         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1097         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1098
1099 # This depmod is only for convenience to give the initial
1100 # boot a modules.dep even before / is mounted read-write.  However the
1101 # boot script depmod is the master version.
1102 PHONY += _modinst_post
1103 _modinst_post: _modinst_
1104         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1105         $(call cmd,depmod)
1106
1107 else # CONFIG_MODULES
1108
1109 # Modules not configured
1110 # ---------------------------------------------------------------------------
1111
1112 modules modules_install: FORCE
1113         @echo
1114         @echo "The present kernel configuration has modules disabled."
1115         @echo "Type 'make config' and enable loadable module support."
1116         @echo "Then build a kernel with module support enabled."
1117         @echo
1118         @exit 1
1119
1120 endif # CONFIG_MODULES
1121
1122 ###
1123 # Cleaning is done on three levels.
1124 # make clean     Delete most generated files
1125 #                Leave enough to build external modules
1126 # make mrproper  Delete the current configuration, and all generated files
1127 # make distclean Remove editor backup files, patch leftover files and the like
1128
1129 # Directories & files removed with 'make clean'
1130 CLEAN_DIRS  += $(MODVERDIR)
1131 CLEAN_FILES +=  vmlinux System.map \
1132                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1133
1134 # Directories & files removed with 'make mrproper'
1135 MRPROPER_DIRS  += include/config usr/include include/generated
1136 MRPROPER_FILES += .config .config.old .version .old_version             \
1137                   include/linux/version.h                               \
1138                   Module.symvers tags TAGS cscope*
1139
1140 # clean - Delete most, but leave enough to build external modules
1141 #
1142 clean: rm-dirs  := $(CLEAN_DIRS)
1143 clean: rm-files := $(CLEAN_FILES)
1144 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1145
1146 PHONY += $(clean-dirs) clean archclean
1147 $(clean-dirs):
1148         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1149
1150 clean: archclean
1151
1152 # mrproper - Delete all generated files, including .config
1153 #
1154 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1155 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1156 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1157
1158 PHONY += $(mrproper-dirs) mrproper archmrproper
1159 $(mrproper-dirs):
1160         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1161
1162 mrproper: clean archmrproper $(mrproper-dirs)
1163         $(call cmd,rmdirs)
1164         $(call cmd,rmfiles)
1165
1166 # distclean
1167 #
1168 PHONY += distclean
1169
1170 distclean: mrproper
1171         @find $(srctree) $(RCS_FIND_IGNORE) \
1172                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1173                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1174                 -o -name '.*.rej' -o -size 0 \
1175                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1176                 -type f -print | xargs rm -f
1177
1178
1179 # Packaging of the kernel to various formats
1180 # ---------------------------------------------------------------------------
1181 # rpm target kept for backward compatibility
1182 package-dir     := $(srctree)/scripts/package
1183
1184 %src-pkg: FORCE
1185         $(Q)$(MAKE) $(build)=$(package-dir) $@
1186 %pkg: include/config/kernel.release FORCE
1187         $(Q)$(MAKE) $(build)=$(package-dir) $@
1188 rpm: include/config/kernel.release FORCE
1189         $(Q)$(MAKE) $(build)=$(package-dir) $@
1190
1191
1192 # Brief documentation of the typical targets used
1193 # ---------------------------------------------------------------------------
1194
1195 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1196 boards := $(notdir $(boards))
1197 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1198 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1199
1200 help:
1201         @echo  'Cleaning targets:'
1202         @echo  '  clean           - Remove most generated files but keep the config and'
1203         @echo  '                    enough build support to build external modules'
1204         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1205         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1206         @echo  ''
1207         @echo  'Configuration targets:'
1208         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1209         @echo  ''
1210         @echo  'Other generic targets:'
1211         @echo  '  all             - Build all targets marked with [*]'
1212         @echo  '* vmlinux         - Build the bare kernel'
1213         @echo  '* modules         - Build all modules'
1214         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1215         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1216         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1217         @echo  '  dir/            - Build all files in dir and below'
1218         @echo  '  dir/file.[oisS] - Build specified target only'
1219         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1220         @echo  '                    (requires a recent binutils and recent build (System.map))'
1221         @echo  '  dir/file.ko     - Build module including final link'
1222         @echo  '  modules_prepare - Set up for building external modules'
1223         @echo  '  tags/TAGS       - Generate tags file for editors'
1224         @echo  '  cscope          - Generate cscope index'
1225         @echo  '  kernelrelease   - Output the release version string'
1226         @echo  '  kernelversion   - Output the version stored in Makefile'
1227         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1228          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1229          echo  ''
1230         @echo  'Static analysers'
1231         @echo  '  checkstack      - Generate a list of stack hogs'
1232         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1233         @echo  '  versioncheck    - Sanity check on version.h usage'
1234         @echo  '  includecheck    - Check for duplicate included header files'
1235         @echo  '  export_report   - List the usages of all exported symbols'
1236         @echo  '  headers_check   - Sanity check on exported headers'
1237         @echo  '  headerdep       - Detect inclusion cycles in headers'
1238         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1239         @echo  ''
1240         @echo  'Kernel packaging:'
1241         @$(MAKE) $(build)=$(package-dir) help
1242         @echo  ''
1243         @echo  'Documentation targets:'
1244         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1245         @echo  ''
1246         @echo  'Architecture specific targets ($(SRCARCH)):'
1247         @$(if $(archhelp),$(archhelp),\
1248                 echo '  No architecture specific help defined for $(SRCARCH)')
1249         @echo  ''
1250         @$(if $(boards), \
1251                 $(foreach b, $(boards), \
1252                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1253                 echo '')
1254         @$(if $(board-dirs), \
1255                 $(foreach b, $(board-dirs), \
1256                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1257                 printf "  %-16s - Show all of the above\\n" help-boards; \
1258                 echo '')
1259
1260         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1261         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1262         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1263         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1264         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1265         @echo  ''
1266         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1267         @echo  'For further info see the ./README file'
1268
1269
1270 help-board-dirs := $(addprefix help-,$(board-dirs))
1271
1272 help-boards: $(help-board-dirs)
1273
1274 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1275
1276 $(help-board-dirs): help-%:
1277         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1278         @$(if $(boards-per-dir), \
1279                 $(foreach b, $(boards-per-dir), \
1280                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1281                 echo '')
1282
1283
1284 # Documentation targets
1285 # ---------------------------------------------------------------------------
1286 %docs: scripts_basic FORCE
1287         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1288
1289 else # KBUILD_EXTMOD
1290
1291 ###
1292 # External module support.
1293 # When building external modules the kernel used as basis is considered
1294 # read-only, and no consistency checks are made and the make
1295 # system is not used on the basis kernel. If updates are required
1296 # in the basis kernel ordinary make commands (without M=...) must
1297 # be used.
1298 #
1299 # The following are the only valid targets when building external
1300 # modules.
1301 # make M=dir clean     Delete all automatically generated files
1302 # make M=dir modules   Make all modules in specified dir
1303 # make M=dir           Same as 'make M=dir modules'
1304 # make M=dir modules_install
1305 #                      Install the modules built in the module directory
1306 #                      Assumes install directory is already created
1307
1308 # We are always building modules
1309 KBUILD_MODULES := 1
1310 PHONY += crmodverdir
1311 crmodverdir:
1312         $(cmd_crmodverdir)
1313
1314 PHONY += $(objtree)/Module.symvers
1315 $(objtree)/Module.symvers:
1316         @test -e $(objtree)/Module.symvers || ( \
1317         echo; \
1318         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1319         echo "           is missing; modules will have no dependencies and modversions."; \
1320         echo )
1321
1322 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1323 PHONY += $(module-dirs) modules
1324 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1325         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1326
1327 modules: $(module-dirs)
1328         @$(kecho) '  Building modules, stage 2.';
1329         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1330
1331 PHONY += modules_install
1332 modules_install: _emodinst_ _emodinst_post
1333
1334 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1335 PHONY += _emodinst_
1336 _emodinst_:
1337         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1338         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1339
1340 PHONY += _emodinst_post
1341 _emodinst_post: _emodinst_
1342         $(call cmd,depmod)
1343
1344 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1345
1346 PHONY += $(clean-dirs) clean
1347 $(clean-dirs):
1348         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1349
1350 clean:  rm-dirs := $(MODVERDIR)
1351 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1352
1353 help:
1354         @echo  '  Building external modules.'
1355         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1356         @echo  ''
1357         @echo  '  modules         - default target, build the module(s)'
1358         @echo  '  modules_install - install the module'
1359         @echo  '  clean           - remove generated files in module directory only'
1360         @echo  ''
1361
1362 # Dummies...
1363 PHONY += prepare scripts
1364 prepare: ;
1365 scripts: ;
1366 endif # KBUILD_EXTMOD
1367
1368 clean: $(clean-dirs)
1369         $(call cmd,rmdirs)
1370         $(call cmd,rmfiles)
1371         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1372                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1373                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1374                 -o -name '*.symtypes' -o -name 'modules.order' \
1375                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1376                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1377
1378 # Generate tags for editors
1379 # ---------------------------------------------------------------------------
1380 quiet_cmd_tags = GEN     $@
1381       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1382
1383 tags TAGS cscope: FORCE
1384         $(call cmd,tags)
1385
1386 # Scripts to check various things for consistency
1387 # ---------------------------------------------------------------------------
1388
1389 includecheck:
1390         find * $(RCS_FIND_IGNORE) \
1391                 -name '*.[hcS]' -type f -print | sort \
1392                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1393
1394 versioncheck:
1395         find * $(RCS_FIND_IGNORE) \
1396                 -name '*.[hcS]' -type f -print | sort \
1397                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1398
1399 coccicheck:
1400         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1401
1402 namespacecheck:
1403         $(PERL) $(srctree)/scripts/namespace.pl
1404
1405 export_report:
1406         $(PERL) $(srctree)/scripts/export_report.pl
1407
1408 endif #ifeq ($(config-targets),1)
1409 endif #ifeq ($(mixed-targets),1)
1410
1411 PHONY += checkstack kernelrelease kernelversion
1412
1413 # UML needs a little special treatment here.  It wants to use the host
1414 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1415 # else wants $(ARCH), including people doing cross-builds, which means
1416 # that $(SUBARCH) doesn't work here.
1417 ifeq ($(ARCH), um)
1418 CHECKSTACK_ARCH := $(SUBARCH)
1419 else
1420 CHECKSTACK_ARCH := $(ARCH)
1421 endif
1422 checkstack:
1423         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1424         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1425
1426 kernelrelease:
1427         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1428
1429 kernelversion:
1430         @echo $(KERNELVERSION)
1431
1432 # Single targets
1433 # ---------------------------------------------------------------------------
1434 # Single targets are compatible with:
1435 # - build with mixed source and output
1436 # - build with separate output dir 'make O=...'
1437 # - external modules
1438 #
1439 #  target-dir => where to store outputfile
1440 #  build-dir  => directory in kernel source tree to use
1441
1442 ifeq ($(KBUILD_EXTMOD),)
1443         build-dir  = $(patsubst %/,%,$(dir $@))
1444         target-dir = $(dir $@)
1445 else
1446         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1447         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1448         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1449 endif
1450
1451 %.s: %.c prepare scripts FORCE
1452         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1453 %.i: %.c prepare scripts FORCE
1454         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1455 %.o: %.c prepare scripts FORCE
1456         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1457 %.lst: %.c prepare scripts FORCE
1458         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1459 %.s: %.S prepare scripts FORCE
1460         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1461 %.o: %.S prepare scripts FORCE
1462         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1463 %.symtypes: %.c prepare scripts FORCE
1464         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1465
1466 # Modules
1467 /: prepare scripts FORCE
1468         $(cmd_crmodverdir)
1469         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1470         $(build)=$(build-dir)
1471 %/: prepare scripts FORCE
1472         $(cmd_crmodverdir)
1473         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1474         $(build)=$(build-dir)
1475 %.ko: prepare scripts FORCE
1476         $(cmd_crmodverdir)
1477         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1478         $(build)=$(build-dir) $(@:.ko=.o)
1479         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1480
1481 # FIXME Should go into a make.lib or something
1482 # ===========================================================================
1483
1484 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1485       cmd_rmdirs = rm -rf $(rm-dirs)
1486
1487 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1488       cmd_rmfiles = rm -f $(rm-files)
1489
1490 # Run depmod only if we have System.map and depmod is executable
1491 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1492       cmd_depmod = \
1493         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1494                 $(DEPMOD) -ae -F System.map                                     \
1495                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1496                 $(KERNELRELEASE);                                               \
1497         fi
1498
1499 # Create temporary dir for module support files
1500 # clean it up only when building all modules
1501 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1502                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1503
1504 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1505           $(KBUILD_AFLAGS_KERNEL)                              \
1506           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1507           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1508
1509 quiet_cmd_as_o_S = AS      $@
1510 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1511
1512 # read all saved command lines
1513
1514 targets := $(wildcard $(sort $(targets)))
1515 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1516
1517 ifneq ($(cmd_files),)
1518   $(cmd_files): ;       # Do not try to update included dependency files
1519   include $(cmd_files)
1520 endif
1521
1522 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1523 # Usage:
1524 # $(Q)$(MAKE) $(clean)=dir
1525 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1526
1527 endif   # skip-makefile
1528
1529 PHONY += FORCE
1530 FORCE:
1531
1532 # Declare the contents of the .PHONY variable as phony.  We keep that
1533 # information in a variable so we can use it in if_changed and friends.
1534 .PHONY: $(PHONY)