Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 37
   4 EXTRAVERSION = -rc6
   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
 228 # SHELL used by kbuild
 229 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 230           else if [ -x /bin/bash ]; then echo /bin/bash; \
 231           else echo sh; fi ; fi)
 232
 233 HOSTCC       = gcc
 234 HOSTCXX      = g++
 235 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 236 HOSTCXXFLAGS = -O2
 237
 238 # Decide whether to build built-in, modular, or both.
 239 # Normally, just do built-in.
 240
 241 KBUILD_MODULES :=
 242 KBUILD_BUILTIN := 1
 243
 244 #       If we have only "make modules", don't compile built-in objects.
 245 #       When we're building modules with modversions, we need to consider
 246 #       the built-in objects during the descend as well, in order to
 247 #       make sure the checksums are up to date before we record them.
 248
 249 ifeq ($(MAKECMDGOALS),modules)
 250   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 251 endif
 252
 253 #       If we have "make <whatever> modules", compile modules
 254 #       in addition to whatever we do anyway.
 255 #       Just "make" or "make all" shall build modules as well
 256
 257 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 258   KBUILD_MODULES := 1
 259 endif
 260
 261 ifeq ($(MAKECMDGOALS),)
 262   KBUILD_MODULES := 1
 263 endif
 264
 265 export KBUILD_MODULES KBUILD_BUILTIN
 266 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 267
 268 # Beautify output
 269 # ---------------------------------------------------------------------------
 270 #
 271 # Normally, we echo the whole command before executing it. By making
 272 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 273 # $(quiet) to choose other forms of output instead, e.g.
 274 #
 275 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 276 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 277 #
 278 # If $(quiet) is empty, the whole command will be printed.
 279 # If it is set to "quiet_", only the short version will be printed.
 280 # If it is set to "silent_", nothing will be printed at all, since
 281 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 282 #
 283 # A simple variant is to prefix commands with $(Q) - that's useful
 284 # for commands that shall be hidden in non-verbose mode.
 285 #
 286 #       $(Q)ln $@ :<
 287 #
 288 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 289 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 290
 291 ifeq ($(KBUILD_VERBOSE),1)
 292   quiet =
 293   Q =
 294 else
 295   quiet=quiet_
 296   Q = @
 297 endif
 298
 299 # If the user is running make -s (silent mode), suppress echoing of
 300 # commands
 301
 302 ifneq ($(findstring s,$(MAKEFLAGS)),)
 303   quiet=silent_
 304 endif
 305
 306 export quiet Q KBUILD_VERBOSE
 307
 308
 309 # Look for make include files relative to root of kernel src
 310 MAKEFLAGS += --include-dir=$(srctree)
 311
 312 # We need some generic definitions (do not try to remake the file).
 313 $(srctree)/scripts/Kbuild.include: ;
 314 include $(srctree)/scripts/Kbuild.include
 315
 316 # Make variables (CC, etc...)
 317
 318 AS              = $(CROSS_COMPILE)as
 319 LD              = $(CROSS_COMPILE)ld
 320 CC              = $(CROSS_COMPILE)gcc
 321 CPP             = $(CC) -E
 322 AR              = $(CROSS_COMPILE)ar
 323 NM              = $(CROSS_COMPILE)nm
 324 STRIP           = $(CROSS_COMPILE)strip
 325 OBJCOPY         = $(CROSS_COMPILE)objcopy
 326 OBJDUMP         = $(CROSS_COMPILE)objdump
 327 AWK             = awk
 328 GENKSYMS        = scripts/genksyms/genksyms
 329 INSTALLKERNEL  := installkernel
 330 DEPMOD          = /sbin/depmod
 331 KALLSYMS        = scripts/kallsyms
 332 PERL            = perl
 333 CHECK           = sparse
 334
 335 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 336                   -Wbitwise -Wno-return-void $(CF)
 337 CFLAGS_MODULE   =
 338 AFLAGS_MODULE   =
 339 LDFLAGS_MODULE  =
 340 CFLAGS_KERNEL   =
 341 AFLAGS_KERNEL   =
 342 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 343
 344
 345 # Use LINUXINCLUDE when you must reference the include/ directory.
 346 # Needed to be compatible with the O= option
 347 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 348                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 349                    -include include/generated/autoconf.h
 350
 351 KBUILD_CPPFLAGS := -D__KERNEL__
 352
 353 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 354                    -fno-strict-aliasing -fno-common \
 355                    -Werror-implicit-function-declaration \
 356                    -Wno-format-security \
 357                    -fno-delete-null-pointer-checks
 358 KBUILD_AFLAGS_KERNEL :=
 359 KBUILD_CFLAGS_KERNEL :=
 360 KBUILD_AFLAGS   := -D__ASSEMBLY__
 361 KBUILD_AFLAGS_MODULE  := -DMODULE
 362 KBUILD_CFLAGS_MODULE  := -DMODULE
 363 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 364
 365 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 366 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 367 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 368
 369 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 370 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 371 export CPP AR NM STRIP OBJCOPY OBJDUMP
 372 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 373 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 374
 375 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 376 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 377 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 378 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 379 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 380
 381 # When compiling out-of-tree modules, put MODVERDIR in the module
 382 # tree rather than in the kernel tree. The kernel tree might
 383 # even be read-only.
 384 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 385
 386 # Files to ignore in find ... statements
 387
 388 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
 389 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 390
 391 # ===========================================================================
 392 # Rules shared between *config targets and build targets
 393
 394 # Basic helpers built in scripts/
 395 PHONY += scripts_basic
 396 scripts_basic:
 397         $(Q)$(MAKE) $(build)=scripts/basic
 398         $(Q)rm -f .tmp_quiet_recordmcount
 399
 400 # To avoid any implicit rule to kick in, define an empty command.
 401 scripts/basic/%: scripts_basic ;
 402
 403 PHONY += outputmakefile
 404 # outputmakefile generates a Makefile in the output directory, if using a
 405 # separate output directory. This allows convenient use of make in the
 406 # output directory.
 407 outputmakefile:
 408 ifneq ($(KBUILD_SRC),)
 409         $(Q)ln -fsn $(srctree) source
 410         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 411             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 412 endif
 413
 414 # To make sure we do not include .config for any of the *config targets
 415 # catch them early, and hand them over to scripts/kconfig/Makefile
 416 # It is allowed to specify more targets when calling make, including
 417 # mixing *config targets and build targets.
 418 # For example 'make oldconfig all'.
 419 # Detect when mixed targets is specified, and make a second invocation
 420 # of make so .config is not included in this case either (for *config).
 421
 422 no-dot-config-targets := clean mrproper distclean \
 423                          cscope TAGS tags help %docs check% coccicheck \
 424                          include/linux/version.h headers_% \
 425                          kernelversion %src-pkg
 426
 427 config-targets := 0
 428 mixed-targets  := 0
 429 dot-config     := 1
 430
 431 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 432         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 433                 dot-config := 0
 434         endif
 435 endif
 436
 437 ifeq ($(KBUILD_EXTMOD),)
 438         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 439                 config-targets := 1
 440                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 441                         mixed-targets := 1
 442                 endif
 443         endif
 444 endif
 445
 446 ifeq ($(mixed-targets),1)
 447 # ===========================================================================
 448 # We're called with mixed targets (*config and build targets).
 449 # Handle them one by one.
 450
 451 %:: FORCE
 452         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 453
 454 else
 455 ifeq ($(config-targets),1)
 456 # ===========================================================================
 457 # *config targets only - make sure prerequisites are updated, and descend
 458 # in scripts/kconfig to make the *config target
 459
 460 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 461 # KBUILD_DEFCONFIG may point out an alternative default configuration
 462 # used for 'make defconfig'
 463 include $(srctree)/arch/$(SRCARCH)/Makefile
 464 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 465
 466 config: scripts_basic outputmakefile FORCE
 467         $(Q)mkdir -p include/linux include/config
 468         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 469
 470 %config: scripts_basic outputmakefile FORCE
 471         $(Q)mkdir -p include/linux include/config
 472         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 473
 474 else
 475 # ===========================================================================
 476 # Build targets only - this includes vmlinux, arch specific targets, clean
 477 # targets and others. In general all targets except *config targets.
 478
 479 ifeq ($(KBUILD_EXTMOD),)
 480 # Additional helpers built in scripts/
 481 # Carefully list dependencies so we do not try to build scripts twice
 482 # in parallel
 483 PHONY += scripts
 484 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 485         $(Q)$(MAKE) $(build)=$(@)
 486
 487 # Objects we will link into vmlinux / subdirs we need to visit
 488 init-y          := init/
 489 drivers-y       := drivers/ sound/ firmware/
 490 net-y           := net/
 491 libs-y          := lib/
 492 core-y          := usr/
 493 endif # KBUILD_EXTMOD
 494
 495 ifeq ($(dot-config),1)
 496 # Read in config
 497 -include include/config/auto.conf
 498
 499 ifeq ($(KBUILD_EXTMOD),)
 500 # Read in dependencies to all Kconfig* files, make sure to run
 501 # oldconfig if changes are detected.
 502 -include include/config/auto.conf.cmd
 503
 504 # To avoid any implicit rule to kick in, define an empty command
 505 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 506
 507 # If .config is newer than include/config/auto.conf, someone tinkered
 508 # with it and forgot to run make oldconfig.
 509 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 510 # we execute the config step to be sure to catch updated Kconfig files
 511 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 512         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 513 else
 514 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 515 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 516 PHONY += include/config/auto.conf
 517
 518 include/config/auto.conf:
 519         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 520         echo;                                                           \
 521         echo "  ERROR: Kernel configuration is invalid.";               \
 522         echo "         include/generated/autoconf.h or $@ are missing.";\
 523         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 524         echo;                                                           \
 525         /bin/false)
 526
 527 endif # KBUILD_EXTMOD
 528
 529 else
 530 # Dummy target needed, because used as prerequisite
 531 include/config/auto.conf: ;
 532 endif # $(dot-config)
 533
 534 # The all: target is the default when no target is given on the
 535 # command line.
 536 # This allow a user to issue only 'make' to build a kernel including modules
 537 # Defaults to vmlinux, but the arch makefile usually adds further targets
 538 all: vmlinux
 539
 540 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 541 KBUILD_CFLAGS   += -Os
 542 else
 543 KBUILD_CFLAGS   += -O2
 544 endif
 545
 546 include $(srctree)/arch/$(SRCARCH)/Makefile
 547
 548 ifneq ($(CONFIG_FRAME_WARN),0)
 549 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 550 endif
 551
 552 # Force gcc to behave correct even for buggy distributions
 553 ifndef CONFIG_CC_STACKPROTECTOR
 554 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 555 endif
 556
 557 ifdef CONFIG_FRAME_POINTER
 558 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 559 else
 560 # Some targets (ARM with Thumb2, for example), can't be built with frame
 561 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 562 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 563 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 564 # -fomit-frame-pointer with FUNCTION_TRACER.
 565 ifndef CONFIG_FUNCTION_TRACER
 566 KBUILD_CFLAGS   += -fomit-frame-pointer
 567 endif
 568 endif
 569
 570 ifdef CONFIG_DEBUG_INFO
 571 KBUILD_CFLAGS   += -g
 572 KBUILD_AFLAGS   += -gdwarf-2
 573 endif
 574
 575 ifdef CONFIG_DEBUG_INFO_REDUCED
 576 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 577 endif
 578
 579 ifdef CONFIG_FUNCTION_TRACER
 580 KBUILD_CFLAGS   += -pg
 581 ifdef CONFIG_DYNAMIC_FTRACE
 582         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 583                 BUILD_C_RECORDMCOUNT := y
 584                 export BUILD_C_RECORDMCOUNT
 585         endif
 586 endif
 587 endif
 588
 589 # We trigger additional mismatches with less inlining
 590 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 591 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 592 endif
 593
 594 # arch Makefile may override CC so keep this after arch Makefile is included
 595 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 596 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 597
 598 # warn about C99 declaration after statement
 599 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 600
 601 # disable pointer signed / unsigned warnings in gcc 4.0
 602 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 603
 604 # disable invalid "can't wrap" optimizations for signed / pointers
 605 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 606
 607 # conserve stack if available
 608 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 609
 610 # check for 'asm goto'
 611 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 612         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 613 endif
 614
 615 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 616 # But warn user when we do so
 617 warn-assign = \
 618 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 619
 620 ifneq ($(KCPPFLAGS),)
 621         $(call warn-assign,CPPFLAGS)
 622         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 623 endif
 624 ifneq ($(KAFLAGS),)
 625         $(call warn-assign,AFLAGS)
 626         KBUILD_AFLAGS += $(KAFLAGS)
 627 endif
 628 ifneq ($(KCFLAGS),)
 629         $(call warn-assign,CFLAGS)
 630         KBUILD_CFLAGS += $(KCFLAGS)
 631 endif
 632
 633 # Use --build-id when available.
 634 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 635                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 636 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 637 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 638
 639 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 640 LDFLAGS_vmlinux += $(call ld-option, -X,)
 641 endif
 642
 643 # Default kernel image to build when no specific target is given.
 644 # KBUILD_IMAGE may be overruled on the command line or
 645 # set in the environment
 646 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 647 # this default value
 648 export KBUILD_IMAGE ?= vmlinux
 649
 650 #
 651 # INSTALL_PATH specifies where to place the updated kernel and system map
 652 # images. Default is /boot, but you can set it to other values
 653 export  INSTALL_PATH ?= /boot
 654
 655 #
 656 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 657 # relocations required by build roots.  This is not defined in the
 658 # makefile but the argument can be passed to make if needed.
 659 #
 660
 661 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 662 export MODLIB
 663
 664 #
 665 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 666 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 667 #  the default option --strip-debug will be used.  Otherwise,
 668 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 669
 670 ifdef INSTALL_MOD_STRIP
 671 ifeq ($(INSTALL_MOD_STRIP),1)
 672 mod_strip_cmd = $(STRIP) --strip-debug
 673 else
 674 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 675 endif # INSTALL_MOD_STRIP=1
 676 else
 677 mod_strip_cmd = true
 678 endif # INSTALL_MOD_STRIP
 679 export mod_strip_cmd
 680
 681
 682 ifeq ($(KBUILD_EXTMOD),)
 683 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 684
 685 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 686                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 687                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 688
 689 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 690                      $(init-n) $(init-) \
 691                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 692                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 693
 694 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 695 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 696 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 697 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 698 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 699 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 700 libs-y          := $(libs-y1) $(libs-y2)
 701
 702 # Build vmlinux
 703 # ---------------------------------------------------------------------------
 704 # vmlinux is built from the objects selected by $(vmlinux-init) and
 705 # $(vmlinux-main). Most are built-in.o files from top-level directories
 706 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 707 # Ordering when linking is important, and $(vmlinux-init) must be first.
 708 #
 709 # vmlinux
 710 #   ^
 711 #   |
 712 #   +-< $(vmlinux-init)
 713 #   |   +--< init/version.o + more
 714 #   |
 715 #   +--< $(vmlinux-main)
 716 #   |    +--< driver/built-in.o mm/built-in.o + more
 717 #   |
 718 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 719 #
 720 # vmlinux version (uname -v) cannot be updated during normal
 721 # descending-into-subdirs phase since we do not yet know if we need to
 722 # update vmlinux.
 723 # Therefore this step is delayed until just before final link of vmlinux -
 724 # except in the kallsyms case where it is done just before adding the
 725 # symbols to the kernel.
 726 #
 727 # System.map is generated to document addresses of all kernel symbols
 728
 729 vmlinux-init := $(head-y) $(init-y)
 730 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 731 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 732 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 733 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 734
 735 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 736 # May be overridden by arch/$(ARCH)/Makefile
 737 quiet_cmd_vmlinux__ ?= LD      $@
 738       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 739       -T $(vmlinux-lds) $(vmlinux-init)                          \
 740       --start-group $(vmlinux-main) --end-group                  \
 741       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 742
 743 # Generate new vmlinux version
 744 quiet_cmd_vmlinux_version = GEN     .version
 745       cmd_vmlinux_version = set -e;                     \
 746         if [ ! -r .version ]; then                      \
 747           rm -f .version;                               \
 748           echo 1 >.version;                             \
 749         else                                            \
 750           mv .version .old_version;                     \
 751           expr 0$$(cat .old_version) + 1 >.version;     \
 752         fi;                                             \
 753         $(MAKE) $(build)=init
 754
 755 # Generate System.map
 756 quiet_cmd_sysmap = SYSMAP
 757       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 758
 759 # Link of vmlinux
 760 # If CONFIG_KALLSYMS is set .version is already updated
 761 # Generate System.map and verify that the content is consistent
 762 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 763 # First command is ':' to allow us to use + in front of the rule
 764 define rule_vmlinux__
 765         :
 766         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 767
 768         $(call cmd,vmlinux__)
 769         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 770
 771         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 772           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 773         $(cmd_sysmap) $@ System.map;                                         \
 774         if [ $$? -ne 0 ]; then                                               \
 775                 rm -f $@;                                                    \
 776                 /bin/false;                                                  \
 777         fi;
 778         $(verify_kallsyms)
 779 endef
 780
 781
 782 ifdef CONFIG_KALLSYMS
 783 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 784 # It's a three stage process:
 785 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 786 #   empty
 787 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 788 #   the right size - vmlinux version (uname -v) is updated during this step
 789 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 790 #   but due to the added section, some addresses have shifted.
 791 #   From here, we generate a correct .tmp_kallsyms2.o
 792 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 793 # o Verify that the System.map from vmlinux matches the map from
 794 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 795 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 796 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 797 #   temporary bypass to allow the kernel to be built while the
 798 #   maintainers work out what went wrong with kallsyms.
 799
 800 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 801 last_kallsyms := 3
 802 else
 803 last_kallsyms := 2
 804 endif
 805
 806 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 807
 808 define verify_kallsyms
 809         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 810           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 811           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 812         $(Q)cmp -s System.map .tmp_System.map ||                             \
 813                 (echo Inconsistent kallsyms data;                            \
 814                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 815                  rm .tmp_kallsyms* ; /bin/false )
 816 endef
 817
 818 # Update vmlinux version before link
 819 # Use + in front of this rule to silent warning about make -j1
 820 # First command is ':' to allow us to use + in front of this rule
 821 cmd_ksym_ld = $(cmd_vmlinux__)
 822 define rule_ksym_ld
 823         :
 824         +$(call cmd,vmlinux_version)
 825         $(call cmd,vmlinux__)
 826         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 827 endef
 828
 829 # Generate .S file with all kernel symbols
 830 quiet_cmd_kallsyms = KSYM    $@
 831       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 832                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 833
 834 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 835         $(call if_changed_dep,as_o_S)
 836
 837 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 838         $(call cmd,kallsyms)
 839
 840 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 841 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 842         $(call if_changed_rule,ksym_ld)
 843
 844 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 845         $(call if_changed,vmlinux__)
 846
 847 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 848         $(call if_changed,vmlinux__)
 849
 850 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 851 $(KALLSYMS): scripts ;
 852
 853 # Generate some data for debugging strange kallsyms problems
 854 debug_kallsyms: .tmp_map$(last_kallsyms)
 855
 856 .tmp_map%: .tmp_vmlinux% FORCE
 857         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 858
 859 .tmp_map3: .tmp_map2
 860
 861 .tmp_map2: .tmp_map1
 862
 863 endif # ifdef CONFIG_KALLSYMS
 864
 865 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 866 # relevant sections renamed as per the linker script.
 867 quiet_cmd_vmlinux-modpost = LD      $@
 868       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 869          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 870          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 871 define rule_vmlinux-modpost
 872         :
 873         +$(call cmd,vmlinux-modpost)
 874         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 875         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 876 endef
 877
 878 # vmlinux image - including updated kernel symbols
 879 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 880 ifdef CONFIG_HEADERS_CHECK
 881         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 882 endif
 883 ifdef CONFIG_SAMPLES
 884         $(Q)$(MAKE) $(build)=samples
 885 endif
 886 ifdef CONFIG_BUILD_DOCSRC
 887         $(Q)$(MAKE) $(build)=Documentation
 888 endif
 889         $(call vmlinux-modpost)
 890         $(call if_changed_rule,vmlinux__)
 891         $(Q)rm -f .old_version
 892
 893 # build vmlinux.o first to catch section mismatch errors early
 894 ifdef CONFIG_KALLSYMS
 895 .tmp_vmlinux1: vmlinux.o
 896 endif
 897
 898 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 899 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 900         $(call if_changed_rule,vmlinux-modpost)
 901
 902 # The actual objects are generated when descending,
 903 # make sure no implicit rule kicks in
 904 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 905
 906 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 907 # Preset locale variables to speed up the build process. Limit locale
 908 # tweaks to this spot to avoid wrong language settings when running
 909 # make menuconfig etc.
 910 # Error messages still appears in the original language
 911
 912 PHONY += $(vmlinux-dirs)
 913 $(vmlinux-dirs): prepare scripts
 914         $(Q)$(MAKE) $(build)=$@
 915
 916 # Store (new) KERNELRELASE string in include/config/kernel.release
 917 include/config/kernel.release: include/config/auto.conf FORCE
 918         $(Q)rm -f $@
 919         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 920
 921
 922 # Things we need to do before we recursively start building the kernel
 923 # or the modules are listed in "prepare".
 924 # A multi level approach is used. prepareN is processed before prepareN-1.
 925 # archprepare is used in arch Makefiles and when processed asm symlink,
 926 # version.h and scripts_basic is processed / created.
 927
 928 # Listed in dependency order
 929 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 930
 931 # prepare3 is used to check if we are building in a separate output directory,
 932 # and if so do:
 933 # 1) Check that make has not been executed in the kernel src $(srctree)
 934 prepare3: include/config/kernel.release
 935 ifneq ($(KBUILD_SRC),)
 936         @$(kecho) '  Using $(srctree) as source for kernel'
 937         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 938                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 939                 echo "  in the '$(srctree)' directory.";\
 940                 /bin/false; \
 941         fi;
 942 endif
 943
 944 # prepare2 creates a makefile if using a separate output directory
 945 prepare2: prepare3 outputmakefile
 946
 947 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 948                    include/config/auto.conf
 949         $(cmd_crmodverdir)
 950
 951 archprepare: prepare1 scripts_basic
 952
 953 prepare0: archprepare FORCE
 954         $(Q)$(MAKE) $(build)=.
 955         $(Q)$(MAKE) $(build)=. missing-syscalls
 956
 957 # All the preparing..
 958 prepare: prepare0
 959
 960 # Generate some files
 961 # ---------------------------------------------------------------------------
 962
 963 # KERNELRELEASE can change from a few different places, meaning version.h
 964 # needs to be updated, so this check is forced on all builds
 965
 966 uts_len := 64
 967 define filechk_utsrelease.h
 968         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 969           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 970           exit 1;                                                         \
 971         fi;                                                               \
 972         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 973 endef
 974
 975 define filechk_version.h
 976         (echo \#define LINUX_VERSION_CODE $(shell                             \
 977         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 978         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 979 endef
 980
 981 include/linux/version.h: $(srctree)/Makefile FORCE
 982         $(call filechk,version.h)
 983
 984 include/generated/utsrelease.h: include/config/kernel.release FORCE
 985         $(call filechk,utsrelease.h)
 986
 987 PHONY += headerdep
 988 headerdep:
 989         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
 990
 991 # ---------------------------------------------------------------------------
 992
 993 PHONY += depend dep
 994 depend dep:
 995         @echo '*** Warning: make $@ is unnecessary now.'
 996
 997 # ---------------------------------------------------------------------------
 998 # Firmware install
 999 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1000 export INSTALL_FW_PATH
1001
1002 PHONY += firmware_install
1003 firmware_install: FORCE
1004         @mkdir -p $(objtree)/firmware
1005         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1006
1007 # ---------------------------------------------------------------------------
1008 # Kernel headers
1009
1010 #Default location for installed headers
1011 export INSTALL_HDR_PATH = $(objtree)/usr
1012
1013 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1014
1015 # If we do an all arch process set dst to asm-$(hdr-arch)
1016 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1017
1018 PHONY += __headers
1019 __headers: include/linux/version.h scripts_basic FORCE
1020         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1021
1022 PHONY += headers_install_all
1023 headers_install_all:
1024         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1025
1026 PHONY += headers_install
1027 headers_install: __headers
1028         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1029         $(error Headers not exportable for the $(SRCARCH) architecture))
1030         $(Q)$(MAKE) $(hdr-inst)=include
1031         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1032
1033 PHONY += headers_check_all
1034 headers_check_all: headers_install_all
1035         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1036
1037 PHONY += headers_check
1038 headers_check: headers_install
1039         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1040         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1041
1042 # ---------------------------------------------------------------------------
1043 # Modules
1044
1045 ifdef CONFIG_MODULES
1046
1047 # By default, build modules as well
1048
1049 all: modules
1050
1051 #       Build modules
1052 #
1053 #       A module can be listed more than once in obj-m resulting in
1054 #       duplicate lines in modules.order files.  Those are removed
1055 #       using awk while concatenating to the final file.
1056
1057 PHONY += modules
1058 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1059         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1060         @$(kecho) '  Building modules, stage 2.';
1061         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1062         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1063
1064 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1065         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1066
1067 %/modules.builtin: include/config/auto.conf
1068         $(Q)$(MAKE) $(modbuiltin)=$*
1069
1070
1071 # Target to prepare building external modules
1072 PHONY += modules_prepare
1073 modules_prepare: prepare scripts
1074
1075 # Target to install modules
1076 PHONY += modules_install
1077 modules_install: _modinst_ _modinst_post
1078
1079 PHONY += _modinst_
1080 _modinst_:
1081         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1082                 echo "Warning: you may need to install module-init-tools"; \
1083                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1084                 sleep 1; \
1085         fi
1086         @rm -rf $(MODLIB)/kernel
1087         @rm -f $(MODLIB)/source
1088         @mkdir -p $(MODLIB)/kernel
1089         @ln -s $(srctree) $(MODLIB)/source
1090         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1091                 rm -f $(MODLIB)/build ; \
1092                 ln -s $(objtree) $(MODLIB)/build ; \
1093         fi
1094         @cp -f $(objtree)/modules.order $(MODLIB)/
1095         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1096         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1097
1098 # This depmod is only for convenience to give the initial
1099 # boot a modules.dep even before / is mounted read-write.  However the
1100 # boot script depmod is the master version.
1101 PHONY += _modinst_post
1102 _modinst_post: _modinst_
1103         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1104         $(call cmd,depmod)
1105
1106 else # CONFIG_MODULES
1107
1108 # Modules not configured
1109 # ---------------------------------------------------------------------------
1110
1111 modules modules_install: FORCE
1112         @echo
1113         @echo "The present kernel configuration has modules disabled."
1114         @echo "Type 'make config' and enable loadable module support."
1115         @echo "Then build a kernel with module support enabled."
1116         @echo
1117         @exit 1
1118
1119 endif # CONFIG_MODULES
1120
1121 ###
1122 # Cleaning is done on three levels.
1123 # make clean     Delete most generated files
1124 #                Leave enough to build external modules
1125 # make mrproper  Delete the current configuration, and all generated files
1126 # make distclean Remove editor backup files, patch leftover files and the like
1127
1128 # Directories & files removed with 'make clean'
1129 CLEAN_DIRS  += $(MODVERDIR)
1130 CLEAN_FILES +=  vmlinux System.map \
1131                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1132
1133 # Directories & files removed with 'make mrproper'
1134 MRPROPER_DIRS  += include/config usr/include include/generated
1135 MRPROPER_FILES += .config .config.old .version .old_version             \
1136                   include/linux/version.h                               \
1137                   Module.symvers tags TAGS cscope*
1138
1139 # clean - Delete most, but leave enough to build external modules
1140 #
1141 clean: rm-dirs  := $(CLEAN_DIRS)
1142 clean: rm-files := $(CLEAN_FILES)
1143 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1144
1145 PHONY += $(clean-dirs) clean archclean
1146 $(clean-dirs):
1147         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1148
1149 clean: archclean
1150
1151 # mrproper - Delete all generated files, including .config
1152 #
1153 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1154 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1155 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1156
1157 PHONY += $(mrproper-dirs) mrproper archmrproper
1158 $(mrproper-dirs):
1159         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1160
1161 mrproper: clean archmrproper $(mrproper-dirs)
1162         $(call cmd,rmdirs)
1163         $(call cmd,rmfiles)
1164
1165 # distclean
1166 #
1167 PHONY += distclean
1168
1169 distclean: mrproper
1170         @find $(srctree) $(RCS_FIND_IGNORE) \
1171                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1172                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1173                 -o -name '.*.rej' -o -size 0 \
1174                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1175                 -type f -print | xargs rm -f
1176
1177
1178 # Packaging of the kernel to various formats
1179 # ---------------------------------------------------------------------------
1180 # rpm target kept for backward compatibility
1181 package-dir     := $(srctree)/scripts/package
1182
1183 %src-pkg: FORCE
1184         $(Q)$(MAKE) $(build)=$(package-dir) $@
1185 %pkg: include/config/kernel.release FORCE
1186         $(Q)$(MAKE) $(build)=$(package-dir) $@
1187 rpm: include/config/kernel.release FORCE
1188         $(Q)$(MAKE) $(build)=$(package-dir) $@
1189
1190
1191 # Brief documentation of the typical targets used
1192 # ---------------------------------------------------------------------------
1193
1194 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1195 boards := $(notdir $(boards))
1196 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1197 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1198
1199 help:
1200         @echo  'Cleaning targets:'
1201         @echo  '  clean           - Remove most generated files but keep the config and'
1202         @echo  '                    enough build support to build external modules'
1203         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1204         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1205         @echo  ''
1206         @echo  'Configuration targets:'
1207         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1208         @echo  ''
1209         @echo  'Other generic targets:'
1210         @echo  '  all             - Build all targets marked with [*]'
1211         @echo  '* vmlinux         - Build the bare kernel'
1212         @echo  '* modules         - Build all modules'
1213         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1214         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1215         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1216         @echo  '  dir/            - Build all files in dir and below'
1217         @echo  '  dir/file.[oisS] - Build specified target only'
1218         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1219         @echo  '                    (requires a recent binutils and recent build (System.map))'
1220         @echo  '  dir/file.ko     - Build module including final link'
1221         @echo  '  modules_prepare - Set up for building external modules'
1222         @echo  '  tags/TAGS       - Generate tags file for editors'
1223         @echo  '  cscope          - Generate cscope index'
1224         @echo  '  kernelrelease   - Output the release version string'
1225         @echo  '  kernelversion   - Output the version stored in Makefile'
1226         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1227          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1228          echo  ''
1229         @echo  'Static analysers'
1230         @echo  '  checkstack      - Generate a list of stack hogs'
1231         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1232         @echo  '  versioncheck    - Sanity check on version.h usage'
1233         @echo  '  includecheck    - Check for duplicate included header files'
1234         @echo  '  export_report   - List the usages of all exported symbols'
1235         @echo  '  headers_check   - Sanity check on exported headers'
1236         @echo  '  headerdep       - Detect inclusion cycles in headers'
1237         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1238         @echo  ''
1239         @echo  'Kernel packaging:'
1240         @$(MAKE) $(build)=$(package-dir) help
1241         @echo  ''
1242         @echo  'Documentation targets:'
1243         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1244         @echo  ''
1245         @echo  'Architecture specific targets ($(SRCARCH)):'
1246         @$(if $(archhelp),$(archhelp),\
1247                 echo '  No architecture specific help defined for $(SRCARCH)')
1248         @echo  ''
1249         @$(if $(boards), \
1250                 $(foreach b, $(boards), \
1251                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1252                 echo '')
1253         @$(if $(board-dirs), \
1254                 $(foreach b, $(board-dirs), \
1255                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1256                 printf "  %-16s - Show all of the above\\n" help-boards; \
1257                 echo '')
1258
1259         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1260         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1261         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1262         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1263         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1264         @echo  ''
1265         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1266         @echo  'For further info see the ./README file'
1267
1268
1269 help-board-dirs := $(addprefix help-,$(board-dirs))
1270
1271 help-boards: $(help-board-dirs)
1272
1273 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1274
1275 $(help-board-dirs): help-%:
1276         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1277         @$(if $(boards-per-dir), \
1278                 $(foreach b, $(boards-per-dir), \
1279                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1280                 echo '')
1281
1282
1283 # Documentation targets
1284 # ---------------------------------------------------------------------------
1285 %docs: scripts_basic FORCE
1286         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1287
1288 else # KBUILD_EXTMOD
1289
1290 ###
1291 # External module support.
1292 # When building external modules the kernel used as basis is considered
1293 # read-only, and no consistency checks are made and the make
1294 # system is not used on the basis kernel. If updates are required
1295 # in the basis kernel ordinary make commands (without M=...) must
1296 # be used.
1297 #
1298 # The following are the only valid targets when building external
1299 # modules.
1300 # make M=dir clean     Delete all automatically generated files
1301 # make M=dir modules   Make all modules in specified dir
1302 # make M=dir           Same as 'make M=dir modules'
1303 # make M=dir modules_install
1304 #                      Install the modules built in the module directory
1305 #                      Assumes install directory is already created
1306
1307 # We are always building modules
1308 KBUILD_MODULES := 1
1309 PHONY += crmodverdir
1310 crmodverdir:
1311         $(cmd_crmodverdir)
1312
1313 PHONY += $(objtree)/Module.symvers
1314 $(objtree)/Module.symvers:
1315         @test -e $(objtree)/Module.symvers || ( \
1316         echo; \
1317         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1318         echo "           is missing; modules will have no dependencies and modversions."; \
1319         echo )
1320
1321 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1322 PHONY += $(module-dirs) modules
1323 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1324         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1325
1326 modules: $(module-dirs)
1327         @$(kecho) '  Building modules, stage 2.';
1328         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1329
1330 PHONY += modules_install
1331 modules_install: _emodinst_ _emodinst_post
1332
1333 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1334 PHONY += _emodinst_
1335 _emodinst_:
1336         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1337         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1338
1339 PHONY += _emodinst_post
1340 _emodinst_post: _emodinst_
1341         $(call cmd,depmod)
1342
1343 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1344
1345 PHONY += $(clean-dirs) clean
1346 $(clean-dirs):
1347         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1348
1349 clean:  rm-dirs := $(MODVERDIR)
1350 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1351
1352 help:
1353         @echo  '  Building external modules.'
1354         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1355         @echo  ''
1356         @echo  '  modules         - default target, build the module(s)'
1357         @echo  '  modules_install - install the module'
1358         @echo  '  clean           - remove generated files in module directory only'
1359         @echo  ''
1360
1361 # Dummies...
1362 PHONY += prepare scripts
1363 prepare: ;
1364 scripts: ;
1365 endif # KBUILD_EXTMOD
1366
1367 clean: $(clean-dirs)
1368         $(call cmd,rmdirs)
1369         $(call cmd,rmfiles)
1370         @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1371                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1372                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1373                 -o -name '*.symtypes' -o -name 'modules.order' \
1374                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1375                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1376
1377 # Generate tags for editors
1378 # ---------------------------------------------------------------------------
1379 quiet_cmd_tags = GEN     $@
1380       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1381
1382 tags TAGS cscope: FORCE
1383         $(call cmd,tags)
1384
1385 # Scripts to check various things for consistency
1386 # ---------------------------------------------------------------------------
1387
1388 includecheck:
1389         find * $(RCS_FIND_IGNORE) \
1390                 -name '*.[hcS]' -type f -print | sort \
1391                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1392
1393 versioncheck:
1394         find * $(RCS_FIND_IGNORE) \
1395                 -name '*.[hcS]' -type f -print | sort \
1396                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1397
1398 coccicheck:
1399         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1400
1401 namespacecheck:
1402         $(PERL) $(srctree)/scripts/namespace.pl
1403
1404 export_report:
1405         $(PERL) $(srctree)/scripts/export_report.pl
1406
1407 endif #ifeq ($(config-targets),1)
1408 endif #ifeq ($(mixed-targets),1)
1409
1410 PHONY += checkstack kernelrelease kernelversion
1411
1412 # UML needs a little special treatment here.  It wants to use the host
1413 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1414 # else wants $(ARCH), including people doing cross-builds, which means
1415 # that $(SUBARCH) doesn't work here.
1416 ifeq ($(ARCH), um)
1417 CHECKSTACK_ARCH := $(SUBARCH)
1418 else
1419 CHECKSTACK_ARCH := $(ARCH)
1420 endif
1421 checkstack:
1422         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1423         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1424
1425 kernelrelease:
1426         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1427
1428 kernelversion:
1429         @echo $(KERNELVERSION)
1430
1431 # Single targets
1432 # ---------------------------------------------------------------------------
1433 # Single targets are compatible with:
1434 # - build with mixed source and output
1435 # - build with separate output dir 'make O=...'
1436 # - external modules
1437 #
1438 #  target-dir => where to store outputfile
1439 #  build-dir  => directory in kernel source tree to use
1440
1441 ifeq ($(KBUILD_EXTMOD),)
1442         build-dir  = $(patsubst %/,%,$(dir $@))
1443         target-dir = $(dir $@)
1444 else
1445         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1446         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1447         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1448 endif
1449
1450 %.s: %.c prepare scripts FORCE
1451         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1452 %.i: %.c prepare scripts FORCE
1453         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1454 %.o: %.c prepare scripts FORCE
1455         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1456 %.lst: %.c prepare scripts FORCE
1457         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1458 %.s: %.S prepare scripts FORCE
1459         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1460 %.o: %.S prepare scripts FORCE
1461         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1462 %.symtypes: %.c prepare scripts FORCE
1463         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1464
1465 # Modules
1466 /: prepare scripts FORCE
1467         $(cmd_crmodverdir)
1468         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1469         $(build)=$(build-dir)
1470 %/: prepare scripts FORCE
1471         $(cmd_crmodverdir)
1472         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1473         $(build)=$(build-dir)
1474 %.ko: prepare scripts FORCE
1475         $(cmd_crmodverdir)
1476         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1477         $(build)=$(build-dir) $(@:.ko=.o)
1478         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1479
1480 # FIXME Should go into a make.lib or something
1481 # ===========================================================================
1482
1483 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1484       cmd_rmdirs = rm -rf $(rm-dirs)
1485
1486 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1487       cmd_rmfiles = rm -f $(rm-files)
1488
1489 # Run depmod only if we have System.map and depmod is executable
1490 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1491       cmd_depmod = \
1492         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1493                 $(DEPMOD) -ae -F System.map                                     \
1494                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1495                 $(KERNELRELEASE);                                               \
1496         fi
1497
1498 # Create temporary dir for module support files
1499 # clean it up only when building all modules
1500 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1501                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1502
1503 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1504           $(KBUILD_AFLAGS_KERNEL)                              \
1505           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1506           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1507
1508 quiet_cmd_as_o_S = AS      $@
1509 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1510
1511 # read all saved command lines
1512
1513 targets := $(wildcard $(sort $(targets)))
1514 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1515
1516 ifneq ($(cmd_files),)
1517   $(cmd_files): ;       # Do not try to update included dependency files
1518   include $(cmd_files)
1519 endif
1520
1521 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1522 # Usage:
1523 # $(Q)$(MAKE) $(clean)=dir
1524 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1525
1526 endif   # skip-makefile
1527
1528 PHONY += FORCE
1529 FORCE:
1530
1531 # Declare the contents of the .PHONY variable as phony.  We keep that
1532 # information in a variable so we can use it in if_changed and friends.
1533 .PHONY: $(PHONY)