Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 17
   4 EXTRAVERSION = .10
   5 NAME=Crazed Snow-Weasel
   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 print "Entering directory ..."
  14 MAKEFLAGS += --no-print-directory
  15
  16 # We are using a recursive build, so we need to do a little thinking
  17 # to get the ordering right.
  18 #
  19 # Most importantly: sub-Makefiles should only ever modify files in
  20 # their own directory. If in some directory we have a dependency on
  21 # a file in another dir (which doesn't happen often, but it's often
  22 # unavoidable when linking the built-in.o targets which finally
  23 # turn into vmlinux), we will call a sub make in that other dir, and
  24 # after that we are sure that everything which is in that other dir
  25 # is now up to date.
  26 #
  27 # The only cases where we need to modify files which have global
  28 # effects are thus separated out and done before the recursive
  29 # descending is started. They are now explicitly listed as the
  30 # prepare rule.
  31
  32 # To put more focus on warnings, be less verbose as default
  33 # Use 'make V=1' to see the full commands
  34
  35 ifdef V
  36   ifeq ("$(origin V)", "command line")
  37     KBUILD_VERBOSE = $(V)
  38   endif
  39 endif
  40 ifndef KBUILD_VERBOSE
  41   KBUILD_VERBOSE = 0
  42 endif
  43
  44 # Call sparse as part of compilation of C files
  45 # Use 'make C=1' to enable sparse checking
  46
  47 ifdef C
  48   ifeq ("$(origin C)", "command line")
  49     KBUILD_CHECKSRC = $(C)
  50   endif
  51 endif
  52 ifndef KBUILD_CHECKSRC
  53   KBUILD_CHECKSRC = 0
  54 endif
  55
  56 # Use make M=dir to specify directory of external module to build
  57 # Old syntax make ... SUBDIRS=$PWD is still supported
  58 # Setting the environment variable KBUILD_EXTMOD take precedence
  59 ifdef SUBDIRS
  60   KBUILD_EXTMOD ?= $(SUBDIRS)
  61 endif
  62 ifdef M
  63   ifeq ("$(origin M)", "command line")
  64     KBUILD_EXTMOD := $(M)
  65   endif
  66 endif
  67
  68
  69 # kbuild supports saving output files in a separate directory.
  70 # To locate output files in a separate directory two syntaxes are supported.
  71 # In both cases the working directory must be the root of the kernel src.
  72 # 1) O=
  73 # Use "make O=dir/to/store/output/files/"
  74 #
  75 # 2) Set KBUILD_OUTPUT
  76 # Set the environment variable KBUILD_OUTPUT to point to the directory
  77 # where the output files shall be placed.
  78 # export KBUILD_OUTPUT=dir/to/store/output/files/
  79 # make
  80 #
  81 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  82 # variable.
  83
  84
  85 # KBUILD_SRC is set on invocation of make in OBJ directory
  86 # KBUILD_SRC is not intended to be used by the regular user (for now)
  87 ifeq ($(KBUILD_SRC),)
  88
  89 # OK, Make called in directory where kernel src resides
  90 # Do we want to locate output files in a separate directory?
  91 ifdef O
  92   ifeq ("$(origin O)", "command line")
  93     KBUILD_OUTPUT := $(O)
  94   endif
  95 endif
  96
  97 # That's our default target when none is given on the command line
  98 PHONY := _all
  99 _all:
 100
 101 ifneq ($(KBUILD_OUTPUT),)
 102 # Invoke a second make in the output directory, passing relevant variables
 103 # check that the output directory actually exists
 104 saved-output := $(KBUILD_OUTPUT)
 105 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 106 $(if $(KBUILD_OUTPUT),, \
 107      $(error output directory "$(saved-output)" does not exist))
 108
 109 PHONY += $(MAKECMDGOALS)
 110
 111 $(filter-out _all,$(MAKECMDGOALS)) _all:
 112         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 113         KBUILD_SRC=$(CURDIR) \
 114         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
 115
 116 # Leave processing to above invocation of make
 117 skip-makefile := 1
 118 endif # ifneq ($(KBUILD_OUTPUT),)
 119 endif # ifeq ($(KBUILD_SRC),)
 120
 121 # We process the rest of the Makefile if this is the final invocation of make
 122 ifeq ($(skip-makefile),)
 123
 124 # If building an external module we do not care about the all: rule
 125 # but instead _all depend on modules
 126 PHONY += all
 127 ifeq ($(KBUILD_EXTMOD),)
 128 _all: all
 129 else
 130 _all: modules
 131 endif
 132
 133 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 134 TOPDIR          := $(srctree)
 135 # FIXME - TOPDIR is obsolete, use srctree/objtree
 136 objtree         := $(CURDIR)
 137 src             := $(srctree)
 138 obj             := $(objtree)
 139
 140 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 141
 142 export srctree objtree VPATH TOPDIR
 143
 144
 145 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 146 # first, and if a usermode build is happening, the "ARCH=um" on the command
 147 # line overrides the setting of ARCH below.  If a native build is happening,
 148 # then ARCH is assigned, getting whatever value it gets normally, and
 149 # SUBARCH is subsequently ignored.
 150
 151 SUBARCH := mips
 152
 153 # Cross compiling and selecting different set of gcc/bin-utils
 154 # ---------------------------------------------------------------------------
 155 #
 156 # When performing cross compilation for other architectures ARCH shall be set
 157 # to the target architecture. (See arch/* for the possibilities).
 158 # ARCH can be set during invocation of make:
 159 # make ARCH=ia64
 160 # Another way is to have ARCH set in the environment.
 161 # The default ARCH is the host where make is executed.
 162
 163 # CROSS_COMPILE specify the prefix used for all executables used
 164 # during compilation. Only gcc and related bin-utils executables
 165 # are prefixed with $(CROSS_COMPILE).
 166 # CROSS_COMPILE can be set on the command line
 167 # make CROSS_COMPILE=ia64-linux-
 168 # Alternatively CROSS_COMPILE can be set in the environment.
 169 # Default value for CROSS_COMPILE is not to prefix executables
 170 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 171
 172 ARCH            ?= $(SUBARCH)
 173 CROSS_COMPILE   ?=
 174
 175 # Architecture as present in compile.h
 176 UTS_MACHINE := $(ARCH)
 177
 178 # SHELL used by kbuild
 179 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 180           else if [ -x /bin/bash ]; then echo /bin/bash; \
 181           else echo sh; fi ; fi)
 182
 183 HOSTCC          = gcc
 184 HOSTCXX         = g++
 185 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 186 HOSTCXXFLAGS    = -O2
 187
 188 #       Decide whether to build built-in, modular, or both.
 189 #       Normally, just do built-in.
 190
 191 KBUILD_MODULES :=
 192 KBUILD_BUILTIN := 1
 193
 194 #       If we have only "make modules", don't compile built-in objects.
 195 #       When we're building modules with modversions, we need to consider
 196 #       the built-in objects during the descend as well, in order to
 197 #       make sure the checksums are uptodate before we record them.
 198
 199 ifeq ($(MAKECMDGOALS),modules)
 200   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 201 endif
 202
 203 #       If we have "make <whatever> modules", compile modules
 204 #       in addition to whatever we do anyway.
 205 #       Just "make" or "make all" shall build modules as well
 206
 207 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 208   KBUILD_MODULES := 1
 209 endif
 210
 211 ifeq ($(MAKECMDGOALS),)
 212   KBUILD_MODULES := 1
 213 endif
 214
 215 export KBUILD_MODULES KBUILD_BUILTIN
 216 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 217
 218 # Beautify output
 219 # ---------------------------------------------------------------------------
 220 #
 221 # Normally, we echo the whole command before executing it. By making
 222 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 223 # $(quiet) to choose other forms of output instead, e.g.
 224 #
 225 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 226 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 227 #
 228 # If $(quiet) is empty, the whole command will be printed.
 229 # If it is set to "quiet_", only the short version will be printed.
 230 # If it is set to "silent_", nothing wil be printed at all, since
 231 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 232 #
 233 # A simple variant is to prefix commands with $(Q) - that's useful
 234 # for commands that shall be hidden in non-verbose mode.
 235 #
 236 #       $(Q)ln $@ :<
 237 #
 238 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 239 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 240
 241 ifeq ($(KBUILD_VERBOSE),1)
 242   quiet =
 243   Q =
 244 else
 245   quiet=quiet_
 246   Q = @
 247 endif
 248
 249 # If the user is running make -s (silent mode), suppress echoing of
 250 # commands
 251
 252 ifneq ($(findstring s,$(MAKEFLAGS)),)
 253   quiet=silent_
 254 endif
 255
 256 export quiet Q KBUILD_VERBOSE
 257
 258
 259 # Look for make include files relative to root of kernel src
 260 MAKEFLAGS += --include-dir=$(srctree)
 261
 262 # We need some generic definitions
 263 include  $(srctree)/scripts/Kbuild.include
 264
 265 # For maximum performance (+ possibly random breakage, uncomment
 266 # the following)
 267
 268 #MAKEFLAGS += -rR
 269
 270 # Make variables (CC, etc...)
 271
 272 AS              = $(CROSS_COMPILE)as
 273 LD              = $(CROSS_COMPILE)ld
 274 CC              = $(CROSS_COMPILE)gcc
 275 CPP             = $(CC) -E
 276 AR              = $(CROSS_COMPILE)ar
 277 NM              = $(CROSS_COMPILE)nm
 278 STRIP           = $(CROSS_COMPILE)strip
 279 OBJCOPY         = $(CROSS_COMPILE)objcopy
 280 OBJDUMP         = $(CROSS_COMPILE)objdump
 281 AWK             = awk
 282 GENKSYMS        = scripts/genksyms/genksyms
 283 DEPMOD          = /sbin/depmod
 284 KALLSYMS        = scripts/kallsyms
 285 PERL            = perl
 286 CHECK           = sparse
 287
 288 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 289 MODFLAGS        = -DMODULE
 290 CFLAGS_MODULE   = $(MODFLAGS)
 291 AFLAGS_MODULE   = $(MODFLAGS)
 292 LDFLAGS_MODULE  = -r
 293 CFLAGS_KERNEL   =
 294 AFLAGS_KERNEL   =
 295
 296
 297 # Use LINUXINCLUDE when you must reference the include/ directory.
 298 # Needed to be compatible with the O= option
 299 LINUXINCLUDE    := -Iinclude \
 300                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 301                    -include include/linux/autoconf.h
 302
 303 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 304
 305 CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 306                    -fno-strict-aliasing -fno-common
 307 AFLAGS          := -D__ASSEMBLY__
 308
 309 # Read KERNELRELEASE from .kernelrelease (if it exists)
 310 KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
 311 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 312
 313 export  VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
 314         ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 315         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 316         HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 317
 318 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 319 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 320 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 321
 322 # When compiling out-of-tree modules, put MODVERDIR in the module
 323 # tree rather than in the kernel tree. The kernel tree might
 324 # even be read-only.
 325 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 326
 327 # Files to ignore in find ... statements
 328
 329 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
 330 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 331
 332 # ===========================================================================
 333 # Rules shared between *config targets and build targets
 334
 335 # Basic helpers built in scripts/
 336 PHONY += scripts_basic
 337 scripts_basic:
 338         $(Q)$(MAKE) $(build)=scripts/basic
 339
 340 # To avoid any implicit rule to kick in, define an empty command.
 341 scripts/basic/%: scripts_basic ;
 342
 343 PHONY += outputmakefile
 344 # outputmakefile generates a Makefile in the output directory, if using a
 345 # separate output directory. This allows convenient use of make in the
 346 # output directory.
 347 outputmakefile:
 348 ifneq ($(KBUILD_SRC),)
 349         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 350             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 351 endif
 352
 353 # To make sure we do not include .config for any of the *config targets
 354 # catch them early, and hand them over to scripts/kconfig/Makefile
 355 # It is allowed to specify more targets when calling make, including
 356 # mixing *config targets and build targets.
 357 # For example 'make oldconfig all'.
 358 # Detect when mixed targets is specified, and make a second invocation
 359 # of make so .config is not included in this case either (for *config).
 360
 361 no-dot-config-targets := clean mrproper distclean \
 362                          cscope TAGS tags help %docs check%
 363
 364 config-targets := 0
 365 mixed-targets  := 0
 366 dot-config     := 1
 367
 368 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 369         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 370                 dot-config := 0
 371         endif
 372 endif
 373
 374 ifeq ($(KBUILD_EXTMOD),)
 375         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 376                 config-targets := 1
 377                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 378                         mixed-targets := 1
 379                 endif
 380         endif
 381 endif
 382
 383 ifeq ($(mixed-targets),1)
 384 # ===========================================================================
 385 # We're called with mixed targets (*config and build targets).
 386 # Handle them one by one.
 387
 388 %:: FORCE
 389         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 390
 391 else
 392 ifeq ($(config-targets),1)
 393 # ===========================================================================
 394 # *config targets only - make sure prerequisites are updated, and descend
 395 # in scripts/kconfig to make the *config target
 396
 397 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 398 # KBUILD_DEFCONFIG may point out an alternative default configuration
 399 # used for 'make defconfig'
 400 include $(srctree)/arch/$(ARCH)/Makefile
 401 export KBUILD_DEFCONFIG
 402
 403 config %config: scripts_basic outputmakefile FORCE
 404         $(Q)mkdir -p include/linux
 405         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 406         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
 407
 408 else
 409 # ===========================================================================
 410 # Build targets only - this includes vmlinux, arch specific targets, clean
 411 # targets and others. In general all targets except *config targets.
 412
 413 ifeq ($(KBUILD_EXTMOD),)
 414 # Additional helpers built in scripts/
 415 # Carefully list dependencies so we do not try to build scripts twice
 416 # in parrallel
 417 PHONY += scripts
 418 scripts: scripts_basic include/config/MARKER
 419         $(Q)$(MAKE) $(build)=$(@)
 420
 421 scripts_basic: include/linux/autoconf.h
 422
 423 # Objects we will link into vmlinux / subdirs we need to visit
 424 init-y          := init/
 425 drivers-y       := drivers/ sound/
 426 net-y           := net/
 427 libs-y          := lib/
 428 core-y          := usr/
 429 endif # KBUILD_EXTMOD
 430
 431 ifeq ($(dot-config),1)
 432 # In this section, we need .config
 433
 434 # Read in dependencies to all Kconfig* files, make sure to run
 435 # oldconfig if changes are detected.
 436 -include .kconfig.d
 437
 438 include .config
 439
 440 # If .config needs to be updated, it will be done via the dependency
 441 # that autoconf has on .config.
 442 # To avoid any implicit rule to kick in, define an empty command
 443 .config .kconfig.d: ;
 444
 445 # If .config is newer than include/linux/autoconf.h, someone tinkered
 446 # with it and forgot to run make oldconfig.
 447 # If kconfig.d is missing then we are probarly in a cleaned tree so
 448 # we execute the config step to be sure to catch updated Kconfig files
 449 include/linux/autoconf.h: .kconfig.d .config
 450         $(Q)mkdir -p include/linux
 451         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 452 else
 453 # Dummy target needed, because used as prerequisite
 454 include/linux/autoconf.h: ;
 455 endif
 456
 457 # The all: target is the default when no target is given on the
 458 # command line.
 459 # This allow a user to issue only 'make' to build a kernel including modules
 460 # Defaults vmlinux but it is usually overriden in the arch makefile
 461 all: vmlinux
 462
 463 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 464 CFLAGS          += -Os
 465 else
 466 CFLAGS          += -O2
 467 endif
 468
 469 ifdef CONFIG_FRAME_POINTER
 470 CFLAGS          += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 471 else
 472 CFLAGS          += -fomit-frame-pointer
 473 endif
 474
 475 ifdef CONFIG_UNWIND_INFO
 476 CFLAGS          += -fasynchronous-unwind-tables
 477 endif
 478
 479 ifdef CONFIG_DEBUG_INFO
 480 CFLAGS          += -g
 481 endif
 482
 483 include $(srctree)/arch/$(ARCH)/Makefile
 484
 485 # arch Makefile may override CC so keep this after arch Makefile is included
 486 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 487 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 488
 489 # warn about C99 declaration after statement
 490 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 491
 492 # disable pointer signedness warnings in gcc 4.0
 493 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 494
 495 # Default kernel image to build when no specific target is given.
 496 # KBUILD_IMAGE may be overruled on the commandline or
 497 # set in the environment
 498 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 499 # this default value
 500 export KBUILD_IMAGE ?= vmlinux
 501
 502 #
 503 # INSTALL_PATH specifies where to place the updated kernel and system map
 504 # images. Default is /boot, but you can set it to other values
 505 export  INSTALL_PATH ?= /boot
 506
 507 #
 508 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 509 # relocations required by build roots.  This is not defined in the
 510 # makefile but the arguement can be passed to make if needed.
 511 #
 512
 513 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 514 export MODLIB
 515
 516
 517 ifeq ($(KBUILD_EXTMOD),)
 518 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 519
 520 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 521                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 522                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 523
 524 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 525                      $(init-n) $(init-) \
 526                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 527                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 528
 529 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 530 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 531 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 532 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 533 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 534 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 535 libs-y          := $(libs-y1) $(libs-y2)
 536
 537 # Build vmlinux
 538 # ---------------------------------------------------------------------------
 539 # vmlinux is build from the objects selected by $(vmlinux-init) and
 540 # $(vmlinux-main). Most are built-in.o files from top-level directories
 541 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 542 # Ordering when linking is important, and $(vmlinux-init) must be first.
 543 #
 544 # vmlinux
 545 #   ^
 546 #   |
 547 #   +-< $(vmlinux-init)
 548 #   |   +--< init/version.o + more
 549 #   |
 550 #   +--< $(vmlinux-main)
 551 #   |    +--< driver/built-in.o mm/built-in.o + more
 552 #   |
 553 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 554 #
 555 # vmlinux version (uname -v) cannot be updated during normal
 556 # descending-into-subdirs phase since we do not yet know if we need to
 557 # update vmlinux.
 558 # Therefore this step is delayed until just before final link of vmlinux -
 559 # except in the kallsyms case where it is done just before adding the
 560 # symbols to the kernel.
 561 #
 562 # System.map is generated to document addresses of all kernel symbols
 563
 564 vmlinux-init := $(head-y) $(init-y)
 565 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 566 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 567 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 568
 569 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 570 # May be overridden by arch/$(ARCH)/Makefile
 571 quiet_cmd_vmlinux__ ?= LD      $@
 572       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 573       -T $(vmlinux-lds) $(vmlinux-init)                          \
 574       --start-group $(vmlinux-main) --end-group                  \
 575       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 576
 577 # Generate new vmlinux version
 578 quiet_cmd_vmlinux_version = GEN     .version
 579       cmd_vmlinux_version = set -e;                     \
 580         if [ ! -r .version ]; then                      \
 581           rm -f .version;                               \
 582           echo 1 >.version;                             \
 583         else                                            \
 584           mv .version .old_version;                     \
 585           expr 0$$(cat .old_version) + 1 >.version;     \
 586         fi;                                             \
 587         $(MAKE) $(build)=init
 588
 589 # Generate System.map
 590 quiet_cmd_sysmap = SYSMAP
 591       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 592
 593 # Link of vmlinux
 594 # If CONFIG_KALLSYMS is set .version is already updated
 595 # Generate System.map and verify that the content is consistent
 596 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 597 # First command is ':' to allow us to use + in front of the rule
 598 define rule_vmlinux__
 599         :
 600         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 601
 602         $(call cmd,vmlinux__)
 603         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 604
 605         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 606           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 607         $(cmd_sysmap) $@ System.map;                    \
 608         if [ $$? -ne 0 ]; then                          \
 609                 rm -f $@;                               \
 610                 /bin/false;                             \
 611         fi;
 612         $(verify_kallsyms)
 613 endef
 614
 615
 616 ifdef CONFIG_KALLSYMS
 617 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 618 # It's a three stage process:
 619 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 620 #   empty
 621 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 622 #   the right size - vmlinux version (uname -v) is updated during this step
 623 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 624 #   but due to the added section, some addresses have shifted.
 625 #   From here, we generate a correct .tmp_kallsyms2.o
 626 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 627 # o Verify that the System.map from vmlinux matches the map from
 628 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 629 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 630 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 631 #   temporary bypass to allow the kernel to be built while the
 632 #   maintainers work out what went wrong with kallsyms.
 633
 634 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 635 last_kallsyms := 3
 636 else
 637 last_kallsyms := 2
 638 endif
 639
 640 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 641
 642 define verify_kallsyms
 643         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 644           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 645           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 646         $(Q)cmp -s System.map .tmp_System.map ||              \
 647                 (echo Inconsistent kallsyms data;             \
 648                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 649                  rm .tmp_kallsyms* ; /bin/false )
 650 endef
 651
 652 # Update vmlinux version before link
 653 # Use + in front of this rule to silent warning about make -j1
 654 # First command is ':' to allow us to use + in front of this rule
 655 cmd_ksym_ld = $(cmd_vmlinux__)
 656 define rule_ksym_ld
 657         :
 658         +$(call cmd,vmlinux_version)
 659         $(call cmd,vmlinux__)
 660         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 661 endef
 662
 663 # Generate .S file with all kernel symbols
 664 quiet_cmd_kallsyms = KSYM    $@
 665       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 666                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 667
 668 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 669         $(call if_changed_dep,as_o_S)
 670
 671 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 672         $(call cmd,kallsyms)
 673
 674 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 675 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 676         $(call if_changed_rule,ksym_ld)
 677
 678 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 679         $(call if_changed,vmlinux__)
 680
 681 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 682         $(call if_changed,vmlinux__)
 683
 684 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 685 $(KALLSYMS): scripts ;
 686
 687 # Generate some data for debugging strange kallsyms problems
 688 debug_kallsyms: .tmp_map$(last_kallsyms)
 689
 690 .tmp_map%: .tmp_vmlinux% FORCE
 691         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 692
 693 .tmp_map3: .tmp_map2
 694
 695 .tmp_map2: .tmp_map1
 696
 697 endif # ifdef CONFIG_KALLSYMS
 698
 699 # vmlinux image - including updated kernel symbols
 700 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 701         $(call if_changed_rule,vmlinux__)
 702         $(Q)rm -f .old_version
 703
 704 # The actual objects are generated when descending,
 705 # make sure no implicit rule kicks in
 706 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 707
 708 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 709 # Preset locale variables to speed up the build process. Limit locale
 710 # tweaks to this spot to avoid wrong language settings when running
 711 # make menuconfig etc.
 712 # Error messages still appears in the original language
 713
 714 PHONY += $(vmlinux-dirs)
 715 $(vmlinux-dirs): prepare scripts
 716         $(Q)$(MAKE) $(build)=$@
 717
 718 # Build the kernel release string
 719 # The KERNELRELEASE is stored in a file named .kernelrelease
 720 # to be used when executing for example make install or make modules_install
 721 #
 722 # Take the contents of any files called localversion* and the config
 723 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
 724 # LOCALVERSION from the command line override all of this
 725
 726 nullstring :=
 727 space      := $(nullstring) # end of line
 728
 729 ___localver = $(objtree)/localversion* $(srctree)/localversion*
 730 __localver  = $(sort $(wildcard $(___localver)))
 731 # skip backup files (containing '~')
 732 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
 733
 734 localver = $(subst $(space),, \
 735            $(shell cat /dev/null $(_localver)) \
 736            $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 737
 738 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 739 # and if the SCM is know a tag from the SCM is appended.
 740 # The appended tag is determinded by the SCM used.
 741 #
 742 # Currently, only git is supported.
 743 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 744 # checks as needed.
 745 ifdef CONFIG_LOCALVERSION_AUTO
 746         _localver-auto = $(shell $(CONFIG_SHELL) \
 747                           $(srctree)/scripts/setlocalversion $(srctree))
 748         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 749 endif
 750
 751 localver-full = $(localver)$(localver-auto)
 752
 753 # Store (new) KERNELRELASE string in .kernelrelease
 754 kernelrelease = $(KERNELVERSION)$(localver-full)
 755 .kernelrelease: FORCE
 756         $(Q)rm -f $@
 757         $(Q)echo $(kernelrelease) > $@
 758
 759
 760 # Things we need to do before we recursively start building the kernel
 761 # or the modules are listed in "prepare".
 762 # A multi level approach is used. prepareN is processed before prepareN-1.
 763 # archprepare is used in arch Makefiles and when processed asm symlink,
 764 # version.h and scripts_basic is processed / created.
 765
 766 # Listed in dependency order
 767 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 768
 769 # prepare-all is deprecated, use prepare as valid replacement
 770 PHONY += prepare-all
 771
 772 # prepare3 is used to check if we are building in a separate output directory,
 773 # and if so do:
 774 # 1) Check that make has not been executed in the kernel src $(srctree)
 775 # 2) Create the include2 directory, used for the second asm symlink
 776 prepare3: .kernelrelease
 777 ifneq ($(KBUILD_SRC),)
 778         @echo '  Using $(srctree) as source for kernel'
 779         $(Q)if [ -f $(srctree)/.config ]; then \
 780                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 781                 echo "  in the '$(srctree)' directory.";\
 782                 /bin/false; \
 783         fi;
 784         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 785         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 786 endif
 787
 788 # prepare2 creates a makefile if using a separate output directory
 789 prepare2: prepare3 outputmakefile
 790
 791 prepare1: prepare2 include/linux/version.h include/asm \
 792                    include/config/MARKER
 793 ifneq ($(KBUILD_MODULES),)
 794         $(Q)mkdir -p $(MODVERDIR)
 795         $(Q)rm -f $(MODVERDIR)/*
 796 endif
 797
 798 archprepare: prepare1 scripts_basic
 799
 800 prepare0: archprepare FORCE
 801         $(Q)$(MAKE) $(build)=.
 802
 803 # All the preparing..
 804 prepare prepare-all: prepare0
 805
 806 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 807 #       done in arch/$(ARCH)/kernel/Makefile
 808
 809 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 810
 811 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 812 #       hard to detect, but I suppose "make mrproper" is a good idea
 813 #       before switching between archs anyway.
 814
 815 include/asm:
 816         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 817         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 818         @ln -fsn asm-$(ARCH) $@
 819
 820 #       Split autoconf.h into include/linux/config/*
 821
 822 include/config/MARKER: scripts/basic/split-include include/linux/autoconf.h
 823         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 824         @scripts/basic/split-include include/linux/autoconf.h include/config
 825         @touch $@
 826
 827 # Generate some files
 828 # ---------------------------------------------------------------------------
 829
 830 # KERNELRELEASE can change from a few different places, meaning version.h
 831 # needs to be updated, so this check is forced on all builds
 832
 833 uts_len := 64
 834
 835 define filechk_version.h
 836         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 837           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 838           exit 1; \
 839         fi; \
 840         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 841           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 842          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 843         )
 844 endef
 845
 846 include/linux/version.h: $(srctree)/Makefile .config .kernelrelease FORCE
 847         $(call filechk,version.h)
 848
 849 # ---------------------------------------------------------------------------
 850
 851 PHONY += depend dep
 852 depend dep:
 853         @echo '*** Warning: make $@ is unnecessary now.'
 854
 855 # ---------------------------------------------------------------------------
 856 # Modules
 857
 858 ifdef CONFIG_MODULES
 859
 860 #       By default, build modules as well
 861
 862 all: modules
 863
 864 #       Build modules
 865
 866 PHONY += modules
 867 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 868         @echo '  Building modules, stage 2.';
 869         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 870
 871
 872 # Target to prepare building external modules
 873 PHONY += modules_prepare
 874 modules_prepare: prepare scripts
 875
 876 # Target to install modules
 877 PHONY += modules_install
 878 modules_install: _modinst_ _modinst_post
 879
 880 PHONY += _modinst_
 881 _modinst_:
 882         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 883                 echo "Warning: you may need to install module-init-tools"; \
 884                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 885                 sleep 1; \
 886         fi
 887         @rm -rf $(MODLIB)/kernel
 888         @rm -f $(MODLIB)/source
 889         @mkdir -p $(MODLIB)/kernel
 890         @ln -s $(srctree) $(MODLIB)/source
 891         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 892                 rm -f $(MODLIB)/build ; \
 893                 ln -s $(objtree) $(MODLIB)/build ; \
 894         fi
 895         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 896
 897 # If System.map exists, run depmod.  This deliberately does not have a
 898 # dependency on System.map since that would run the dependency tree on
 899 # vmlinux.  This depmod is only for convenience to give the initial
 900 # boot a modules.dep even before / is mounted read-write.  However the
 901 # boot script depmod is the master version.
 902 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 903 depmod_opts     :=
 904 else
 905 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 906 endif
 907 PHONY += _modinst_post
 908 _modinst_post: _modinst_
 909         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 910
 911 else # CONFIG_MODULES
 912
 913 # Modules not configured
 914 # ---------------------------------------------------------------------------
 915
 916 modules modules_install: FORCE
 917         @echo
 918         @echo "The present kernel configuration has modules disabled."
 919         @echo "Type 'make config' and enable loadable module support."
 920         @echo "Then build a kernel with module support enabled."
 921         @echo
 922         @exit 1
 923
 924 endif # CONFIG_MODULES
 925
 926 ###
 927 # Cleaning is done on three levels.
 928 # make clean     Delete most generated files
 929 #                Leave enough to build external modules
 930 # make mrproper  Delete the current configuration, and all generated files
 931 # make distclean Remove editor backup files, patch leftover files and the like
 932
 933 # Directories & files removed with 'make clean'
 934 CLEAN_DIRS  += $(MODVERDIR)
 935 CLEAN_FILES +=  vmlinux System.map \
 936                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 937
 938 # Directories & files removed with 'make mrproper'
 939 MRPROPER_DIRS  += include/config include2
 940 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
 941                   include/linux/autoconf.h include/linux/version.h \
 942                   .kernelrelease Module.symvers tags TAGS cscope*
 943
 944 # clean - Delete most, but leave enough to build external modules
 945 #
 946 clean: rm-dirs  := $(CLEAN_DIRS)
 947 clean: rm-files := $(CLEAN_FILES)
 948 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
 949
 950 PHONY += $(clean-dirs) clean archclean
 951 $(clean-dirs):
 952         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 953
 954 clean: archclean $(clean-dirs)
 955         $(call cmd,rmdirs)
 956         $(call cmd,rmfiles)
 957         @find . $(RCS_FIND_IGNORE) \
 958                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 959                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 960                 -type f -print | xargs rm -f
 961
 962 # mrproper - Delete all generated files, including .config
 963 #
 964 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 965 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 966 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
 967
 968 PHONY += $(mrproper-dirs) mrproper archmrproper
 969 $(mrproper-dirs):
 970         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 971
 972 mrproper: clean archmrproper $(mrproper-dirs)
 973         $(call cmd,rmdirs)
 974         $(call cmd,rmfiles)
 975
 976 # distclean
 977 #
 978 PHONY += distclean
 979
 980 distclean: mrproper
 981         @find $(srctree) $(RCS_FIND_IGNORE) \
 982                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 983                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 984                 -o -name '.*.rej' -o -size 0 \
 985                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
 986                 -type f -print | xargs rm -f
 987
 988
 989 # Packaging of the kernel to various formats
 990 # ---------------------------------------------------------------------------
 991 # rpm target kept for backward compatibility
 992 package-dir     := $(srctree)/scripts/package
 993
 994 %pkg: FORCE
 995         $(Q)$(MAKE) $(build)=$(package-dir) $@
 996 rpm: FORCE
 997         $(Q)$(MAKE) $(build)=$(package-dir) $@
 998
 999
1000 # Brief documentation of the typical targets used
1001 # ---------------------------------------------------------------------------
1002
1003 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1004 boards := $(notdir $(boards))
1005
1006 help:
1007         @echo  'Cleaning targets:'
1008         @echo  '  clean           - remove most generated files but keep the config'
1009         @echo  '  mrproper        - remove all generated files + config + various backup files'
1010         @echo  ''
1011         @echo  'Configuration targets:'
1012         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1013         @echo  ''
1014         @echo  'Other generic targets:'
1015         @echo  '  all             - Build all targets marked with [*]'
1016         @echo  '* vmlinux         - Build the bare kernel'
1017         @echo  '* modules         - Build all modules'
1018         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1019         @echo  '  dir/            - Build all files in dir and below'
1020         @echo  '  dir/file.[ois]  - Build specified target only'
1021         @echo  '  dir/file.ko     - Build module including final link'
1022         @echo  '  rpm             - Build a kernel as an RPM package'
1023         @echo  '  tags/TAGS       - Generate tags file for editors'
1024         @echo  '  cscope          - Generate cscope index'
1025         @echo  '  kernelrelease   - Output the release version string'
1026         @echo  '  kernelversion   - Output the version stored in Makefile'
1027         @echo  ''
1028         @echo  'Static analysers'
1029         @echo  '  checkstack      - Generate a list of stack hogs'
1030         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1031         @echo  ''
1032         @echo  'Kernel packaging:'
1033         @$(MAKE) $(build)=$(package-dir) help
1034         @echo  ''
1035         @echo  'Documentation targets:'
1036         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1037         @echo  ''
1038         @echo  'Architecture specific targets ($(ARCH)):'
1039         @$(if $(archhelp),$(archhelp),\
1040                 echo '  No architecture specific help defined for $(ARCH)')
1041         @echo  ''
1042         @$(if $(boards), \
1043                 $(foreach b, $(boards), \
1044                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1045                 echo '')
1046
1047         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1048         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1049         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1050         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1051         @echo  ''
1052         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1053         @echo  'For further info see the ./README file'
1054
1055
1056 # Documentation targets
1057 # ---------------------------------------------------------------------------
1058 %docs: scripts_basic FORCE
1059         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1060
1061 else # KBUILD_EXTMOD
1062
1063 ###
1064 # External module support.
1065 # When building external modules the kernel used as basis is considered
1066 # read-only, and no consistency checks are made and the make
1067 # system is not used on the basis kernel. If updates are required
1068 # in the basis kernel ordinary make commands (without M=...) must
1069 # be used.
1070 #
1071 # The following are the only valid targets when building external
1072 # modules.
1073 # make M=dir clean     Delete all automatically generated files
1074 # make M=dir modules   Make all modules in specified dir
1075 # make M=dir           Same as 'make M=dir modules'
1076 # make M=dir modules_install
1077 #                      Install the modules build in the module directory
1078 #                      Assumes install directory is already created
1079
1080 # We are always building modules
1081 KBUILD_MODULES := 1
1082 PHONY += crmodverdir
1083 crmodverdir:
1084         $(Q)mkdir -p $(MODVERDIR)
1085         $(Q)rm -f $(MODVERDIR)/*
1086
1087 PHONY += $(objtree)/Module.symvers
1088 $(objtree)/Module.symvers:
1089         @test -e $(objtree)/Module.symvers || ( \
1090         echo; \
1091         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1092         echo "           is missing; modules will have no dependencies and modversions."; \
1093         echo )
1094
1095 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1096 PHONY += $(module-dirs) modules
1097 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1098         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1099
1100 modules: $(module-dirs)
1101         @echo '  Building modules, stage 2.';
1102         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1103
1104 PHONY += modules_install
1105 modules_install: _emodinst_ _emodinst_post
1106
1107 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1108 PHONY += _emodinst_
1109 _emodinst_:
1110         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1111         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1112
1113 # Run depmod only is we have System.map and depmod is executable
1114 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1115       cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1116                       $(DEPMOD) -ae -F System.map             \
1117                       $(if $(strip $(INSTALL_MOD_PATH)),      \
1118                       -b $(INSTALL_MOD_PATH) -r)              \
1119                       $(KERNELRELEASE);                       \
1120                    fi
1121
1122 PHONY += _emodinst_post
1123 _emodinst_post: _emodinst_
1124         $(call cmd,depmod)
1125
1126 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1127
1128 PHONY += $(clean-dirs) clean
1129 $(clean-dirs):
1130         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1131
1132 clean:  rm-dirs := $(MODVERDIR)
1133 clean: $(clean-dirs)
1134         $(call cmd,rmdirs)
1135         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1136                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1137                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1138                 -type f -print | xargs rm -f
1139
1140 help:
1141         @echo  '  Building external modules.'
1142         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1143         @echo  ''
1144         @echo  '  modules         - default target, build the module(s)'
1145         @echo  '  modules_install - install the module'
1146         @echo  '  clean           - remove generated files in module directory only'
1147         @echo  ''
1148
1149 # Dummies...
1150 PHONY += prepare scripts
1151 prepare: ;
1152 scripts: ;
1153 endif # KBUILD_EXTMOD
1154
1155 # Generate tags for editors
1156 # ---------------------------------------------------------------------------
1157
1158 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1159 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1160 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1161
1162 ifeq ($(src),$(obj))
1163 __srctree =
1164 else
1165 __srctree = $(srctree)/
1166 endif
1167
1168 ifeq ($(ALLSOURCE_ARCHS),)
1169 ifeq ($(ARCH),um)
1170 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1171 else
1172 ALLINCLUDE_ARCHS := $(ARCH)
1173 endif
1174 else
1175 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1176 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1177 endif
1178
1179 ALLSOURCE_ARCHS := $(ARCH)
1180
1181 define all-sources
1182         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1183                \( -name include -o -name arch \) -prune -o \
1184                -name '*.[chS]' -print; \
1185           for ARCH in $(ALLSOURCE_ARCHS) ; do \
1186                find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1187                     -name '*.[chS]' -print; \
1188           done ; \
1189           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1190                -name '*.[chS]' -print; \
1191           find $(__srctree)include $(RCS_FIND_IGNORE) \
1192                \( -name config -o -name 'asm-*' \) -prune \
1193                -o -name '*.[chS]' -print; \
1194           for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1195                find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1196                     -name '*.[chS]' -print; \
1197           done ; \
1198           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1199                -name '*.[chS]' -print )
1200 endef
1201
1202 quiet_cmd_cscope-file = FILELST cscope.files
1203       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1204
1205 quiet_cmd_cscope = MAKE    cscope.out
1206       cmd_cscope = cscope -b
1207
1208 cscope: FORCE
1209         $(call cmd,cscope-file)
1210         $(call cmd,cscope)
1211
1212 quiet_cmd_TAGS = MAKE   $@
1213 define cmd_TAGS
1214         rm -f $@; \
1215         ETAGSF=`etags --version | grep -i exuberant >/dev/null &&     \
1216                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1217                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1218                       --extra=+f --c-kinds=+px"`;                     \
1219                 $(all-sources) | xargs etags $$ETAGSF -a
1220 endef
1221
1222 TAGS: FORCE
1223         $(call cmd,TAGS)
1224
1225
1226 quiet_cmd_tags = MAKE   $@
1227 define cmd_tags
1228         rm -f $@; \
1229         CTAGSF=`ctags --version | grep -i exuberant >/dev/null &&     \
1230                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1231                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1232                       --extra=+f --c-kinds=+px"`;                     \
1233                 $(all-sources) | xargs ctags $$CTAGSF -a
1234 endef
1235
1236 tags: FORCE
1237         $(call cmd,tags)
1238
1239
1240 # Scripts to check various things for consistency
1241 # ---------------------------------------------------------------------------
1242
1243 includecheck:
1244         find * $(RCS_FIND_IGNORE) \
1245                 -name '*.[hcS]' -type f -print | sort \
1246                 | xargs $(PERL) -w scripts/checkincludes.pl
1247
1248 versioncheck:
1249         find * $(RCS_FIND_IGNORE) \
1250                 -name '*.[hcS]' -type f -print | sort \
1251                 | xargs $(PERL) -w scripts/checkversion.pl
1252
1253 namespacecheck:
1254         $(PERL) $(srctree)/scripts/namespace.pl
1255
1256 endif #ifeq ($(config-targets),1)
1257 endif #ifeq ($(mixed-targets),1)
1258
1259 PHONY += checkstack
1260 checkstack:
1261         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1262         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1263
1264 kernelrelease:
1265         $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1266         $(error kernelrelease not valid - run 'make *config' to update it))
1267 kernelversion:
1268         @echo $(KERNELVERSION)
1269
1270 # Single targets
1271 # ---------------------------------------------------------------------------
1272 # Single targets are compatible with:
1273 # - build whith mixed source and output
1274 # - build with separate output dir 'make O=...'
1275 # - external modules
1276 #
1277 #  target-dir => where to store outputfile
1278 #  build-dir  => directory in kernel source tree to use
1279
1280 ifeq ($(KBUILD_EXTMOD),)
1281         build-dir  = $(patsubst %/,%,$(dir $@))
1282         target-dir = $(dir $@)
1283 else
1284         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1285         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1286         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1287 endif
1288
1289 %.s: %.c prepare scripts FORCE
1290         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1291 %.i: %.c prepare scripts FORCE
1292         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1293 %.o: %.c prepare scripts FORCE
1294         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1295 %.lst: %.c prepare scripts FORCE
1296         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1297 %.s: %.S prepare scripts FORCE
1298         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1299 %.o: %.S prepare scripts FORCE
1300         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1301
1302 # Modules
1303 / %/: prepare scripts FORCE
1304         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1305         $(build)=$(build-dir)
1306 %.ko: prepare scripts FORCE
1307         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1308         $(build)=$(build-dir) $(@:.ko=.o)
1309         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1310
1311 # FIXME Should go into a make.lib or something
1312 # ===========================================================================
1313
1314 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1315       cmd_rmdirs = rm -rf $(rm-dirs)
1316
1317 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1318       cmd_rmfiles = rm -f $(rm-files)
1319
1320
1321 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1322           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1323           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1324
1325 quiet_cmd_as_o_S = AS      $@
1326 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1327
1328 # read all saved command lines
1329
1330 targets := $(wildcard $(sort $(targets)))
1331 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1332
1333 ifneq ($(cmd_files),)
1334   $(cmd_files): ;       # Do not try to update included dependency files
1335   include $(cmd_files)
1336 endif
1337
1338 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1339 # Usage:
1340 # $(Q)$(MAKE) $(clean)=dir
1341 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1342
1343 endif   # skip-makefile
1344
1345 PHONY += FORCE
1346 FORCE:
1347
1348
1349 # Declare the contents of the .PHONY variable as phony.  We keep that
1350 # information in a variable se we can use it in if_changed and friends.
1351 .PHONY: $(PHONY)