Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 1
   4 EXTRAVERSION =-rc1
   5
   6 # *DOCUMENTATION*
   7 # To see a list of typical targets execute "make help"
   8 # More info can be located in ./README
   9 # Comments in this file are targeted only to the developer, do not
  10 # expect to learn how to build the kernel reading this file.
  11
  12 # Do not print "Entering directory ..."
  13 MAKEFLAGS += --no-print-directory
  14
  15 # We are using a recursive build, so we need to do a little thinking
  16 # to get the ordering right.
  17 #
  18 # Most importantly: sub-Makefiles should only ever modify files in
  19 # their own directory. If in some directory we have a dependency on
  20 # a file in another dir (which doesn't happen often, but it's of
  21 # unavoidable when linking the built-in.o targets which finally
  22 # turn into vmlinux), we will call a sub make in that other dir, and
  23 # after that we are sure that everything which is in that other dir
  24 # is now up to date.
  25 #
  26 # The only cases where we need to modify files which have global
  27 # effects are thus separated out and done before the recursive
  28 # descending is started. They are now explicitly listed as the
  29 # prepare rule.
  30
  31 # To put more focus on warnings, be less verbose as default
  32 # Use 'make V=1' to see the full commands
  33
  34 ifdef V
  35   ifeq ("$(origin V)", "command line")
  36     KBUILD_VERBOSE = $(V)
  37   endif
  38 endif
  39 ifndef KBUILD_VERBOSE
  40   KBUILD_VERBOSE = 0
  41 endif
  42
  43 # Call sparse as part of compilation of C files
  44 # Use 'make C=1' to enable sparse checking
  45
  46 ifdef C
  47   ifeq ("$(origin C)", "command line")
  48     KBUILD_CHECKSRC = $(C)
  49   endif
  50 endif
  51 ifndef KBUILD_CHECKSRC
  52   KBUILD_CHECKSRC = 0
  53 endif
  54
  55 # kbuild supports saving output files in a separate directory.
  56 # To locate output files in a separate directory two syntax'es are supported.
  57 # In both cases the working directory must be the root of the kernel src.
  58 # 1) O=
  59 # Use "make O=dir/to/store/output/files/"
  60 #
  61 # 2) Set KBUILD_OUTPUT
  62 # Set the environment variable KBUILD_OUTPUT to point to the directory
  63 # where the output files shall be placed.
  64 # export KBUILD_OUTPUT=dir/to/store/output/files/
  65 # make
  66 #
  67 # The O= assigment takes precedence over the KBUILD_OUTPUT environment variable.
  68
  69
  70 # KBUILD_SRC is set on invocation of make in OBJ directory
  71 # KBUILD_SRC is not intended to be used by the regular user (for now)
  72 ifeq ($(KBUILD_SRC),)
  73
  74 # OK, Make called in directory where kernel src resides
  75 # Do we want to locate output files in a separate directory?
  76 ifdef O
  77   ifeq ("$(origin O)", "command line")
  78     KBUILD_OUTPUT := $(O)
  79   endif
  80 endif
  81
  82 # That's our default target when none is given on the command line
  83 .PHONY: all
  84 all:
  85
  86 ifneq ($(KBUILD_OUTPUT),)
  87 # Invoke a second make in the output directory, passing relevant variables
  88 # check that the output directory actually exists
  89 saved-output := $(KBUILD_OUTPUT)
  90 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
  91 $(if $(wildcard $(KBUILD_OUTPUT)),, \
  92      $(error output directory "$(saved-output)" does not exist))
  93
  94 .PHONY: $(MAKECMDGOALS)
  95
  96 $(filter-out all,$(MAKECMDGOALS)) all:
  97         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT)         \
  98         KBUILD_SRC=$(CURDIR)    KBUILD_VERBOSE=$(KBUILD_VERBOSE)        \
  99         KBUILD_CHECK=$(KBUILD_CHECK) -f $(CURDIR)/Makefile $@
 100
 101 # Leave processing to above invocation of make
 102 skip-makefile := 1
 103 endif # ifneq ($(KBUILD_OUTPUT),)
 104 endif # ifeq ($(KBUILD_SRC),)
 105
 106 # We process the rest of the Makefile if this is the final invocation of make
 107 ifeq ($(skip-makefile),)
 108
 109 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 110 TOPDIR          := $(srctree)
 111 # FIXME - TOPDIR is obsolete, use srctree/objtree
 112 objtree         := $(CURDIR)
 113 src             := $(srctree)
 114 obj             := $(objtree)
 115
 116 VPATH           := $(srctree)
 117
 118 export srctree objtree VPATH TOPDIR
 119
 120 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 121
 122 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 123 # first, and if a usermode build is happening, the "ARCH=um" on the command
 124 # line overrides the setting of ARCH below.  If a native build is happening,
 125 # then ARCH is assigned, getting whatever value it gets normally, and
 126 # SUBARCH is subsequently ignored.
 127
 128 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 129                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 130                                   -e s/s390x/s390/ -e s/parisc64/parisc/ )
 131
 132 # Cross compiling and selecting different set of gcc/bin-utils
 133 # ---------------------------------------------------------------------------
 134 #
 135 # When performing cross compilation for other architectures ARCH shall be set
 136 # to the target architecture. (See arch/* for the possibilities).
 137 # ARCH can be set during invocation of make:
 138 # make ARCH=ia64
 139 # Another way is to have ARCH set in the environment.
 140 # The default ARCH is the host where make is executed.
 141
 142 # CROSS_COMPILE specify the prefix used for all executables used
 143 # during compilation. Only gcc and related bin-utils executables
 144 # are prefixed with $(CROSS_COMPILE).
 145 # CROSS_COMPILE can be set on the command line
 146 # make CROSS_COMPILE=ia64-linux-
 147 # Alternatively CROSS_COMPILE can be set in the environment.
 148 # Default value for CROSS_COMPILE is not to prefix executables
 149 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 150
 151 ARCH            ?= $(SUBARCH)
 152 CROSS_COMPILE   ?=
 153
 154 # Architecture as present in compile.h
 155 UTS_MACHINE := $(ARCH)
 156
 157 # SHELL used by kbuild
 158 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 159           else if [ -x /bin/bash ]; then echo /bin/bash; \
 160           else echo sh; fi ; fi)
 161
 162 HOSTCC          = gcc
 163 HOSTCXX         = g++
 164 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 165 HOSTCXXFLAGS    = -O2
 166
 167 #       Decide whether to build built-in, modular, or both.
 168 #       Normally, just do built-in.
 169
 170 KBUILD_MODULES :=
 171 KBUILD_BUILTIN := 1
 172
 173 #       If we have only "make modules", don't compile built-in objects.
 174 #       When we're building modules with modversions, we need to consider
 175 #       the built-in objects during the descend as well, in order to
 176 #       make sure the checksums are uptodate before we record them.
 177
 178 ifeq ($(MAKECMDGOALS),modules)
 179   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 180 endif
 181
 182 #       If we have "make <whatever> modules", compile modules
 183 #       in addition to whatever we do anyway.
 184 #       Just "make" or "make all" shall build modules as well
 185
 186 ifneq ($(filter all modules,$(MAKECMDGOALS)),)
 187   KBUILD_MODULES := 1
 188 endif
 189
 190 ifeq ($(MAKECMDGOALS),)
 191   KBUILD_MODULES := 1
 192 endif
 193
 194 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
 195 export KBUILD_CHECKSRC KBUILD_SRC
 196
 197 # Beautify output
 198 # ---------------------------------------------------------------------------
 199 #
 200 # Normally, we echo the whole command before executing it. By making
 201 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 202 # $(quiet) to choose other forms of output instead, e.g.
 203 #
 204 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 205 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 206 #
 207 # If $(quiet) is empty, the whole command will be printed.
 208 # If it is set to "quiet_", only the short version will be printed.
 209 # If it is set to "silent_", nothing wil be printed at all, since
 210 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 211 #
 212 # A simple variant is to prefix commands with $(Q) - that's usefull
 213 # for commands that shall be hidden in non-verbose mode.
 214 #
 215 #       $(Q)ln $@ :<
 216 #
 217 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 218 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 219
 220 ifeq ($(KBUILD_VERBOSE),1)
 221   quiet =
 222   Q =
 223 else
 224   quiet=quiet_
 225   Q = @
 226 endif
 227
 228 # If the user is running make -s (silent mode), suppress echoing of
 229 # commands
 230
 231 ifneq ($(findstring s,$(MAKEFLAGS)),)
 232   quiet=silent_
 233 endif
 234
 235 check_gcc = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 236
 237 export quiet Q KBUILD_VERBOSE check_gcc
 238
 239 # Look for make include files relative to root of kernel src
 240 MAKEFLAGS += --include-dir=$(srctree)
 241
 242 # For maximum performance (+ possibly random breakage, uncomment
 243 # the following)
 244
 245 #MAKEFLAGS += -rR
 246
 247 # Make variables (CC, etc...)
 248
 249 AS              = $(CROSS_COMPILE)as
 250 LD              = $(CROSS_COMPILE)ld
 251 CC              = $(CROSS_COMPILE)gcc
 252 CPP             = $(CC) -E
 253 AR              = $(CROSS_COMPILE)ar
 254 NM              = $(CROSS_COMPILE)nm
 255 STRIP           = $(CROSS_COMPILE)strip
 256 OBJCOPY         = $(CROSS_COMPILE)objcopy
 257 OBJDUMP         = $(CROSS_COMPILE)objdump
 258 AWK             = awk
 259 RPM             := $(shell if [ -x "/usr/bin/rpmbuild" ]; then echo rpmbuild; \
 260                         else echo rpm; fi)
 261 GENKSYMS        = scripts/genksyms/genksyms
 262 DEPMOD          = /sbin/depmod
 263 KALLSYMS        = scripts/kallsyms
 264 PERL            = perl
 265 CHECK           = sparse
 266 MODFLAGS        = -DMODULE
 267 CFLAGS_MODULE   = $(MODFLAGS)
 268 AFLAGS_MODULE   = $(MODFLAGS)
 269 LDFLAGS_MODULE  = -r
 270 CFLAGS_KERNEL   =
 271 AFLAGS_KERNEL   =
 272
 273 NOSTDINC_FLAGS  = -nostdinc -iwithprefix include
 274
 275 CPPFLAGS        := -D__KERNEL__ -Iinclude \
 276                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
 277
 278 CFLAGS          := -Wall -Wstrict-prototypes -Wno-trigraphs \
 279                    -fno-strict-aliasing -fno-common
 280 AFLAGS          := -D__ASSEMBLY__
 281
 282 export  VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
 283         CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 284         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 285         HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB LDFLAGS_MODULE CHECK
 286
 287 export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFLAGS LDFLAGS
 288 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 289 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 290
 291 export MODVERDIR := .tmp_versions
 292
 293 # The temporary file to save gcc -MD generated dependencies must not
 294 # contain a comma
 295 comma := ,
 296 depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
 297
 298 # Files to ignore in find ... statements
 299
 300 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \) -prune -o
 301 RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS
 302
 303 # ===========================================================================
 304 # Rules shared between *config targets and build targets
 305
 306 # Helpers built in scripts/
 307
 308 scripts/docproc scripts/split-include : scripts ;
 309
 310 .PHONY: scripts scripts/fixdep
 311 scripts:
 312         $(Q)$(MAKE) $(build)=scripts
 313
 314 scripts/fixdep:
 315         $(Q)$(MAKE) $(build)=scripts $@
 316
 317
 318 # To make sure we do not include .config for any of the *config targets
 319 # catch them early, and hand them over to scripts/kconfig/Makefile
 320 # It is allowed to specify more targets when calling make, including
 321 # mixing *config targets and build targets.
 322 # For example 'make oldconfig all'.
 323 # Detect when mixed targets is specified, and make a second invocation
 324 # of make so .config is not included in this case either (for *config).
 325
 326 no-dot-config-targets := clean mrproper distclean \
 327                          cscope TAGS tags help %docs check%
 328
 329 config-targets := 0
 330 mixed-targets  := 0
 331 dot-config     := 1
 332
 333 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 334         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 335                 dot-config := 0
 336         endif
 337 endif
 338
 339 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 340         config-targets := 1
 341         ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 342                 mixed-targets := 1
 343         endif
 344 endif
 345
 346 ifeq ($(mixed-targets),1)
 347 # ===========================================================================
 348 # We're called with mixed targets (*config and build targets).
 349 # Handle them one by one.
 350
 351 %:: FORCE
 352         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 353
 354 else
 355 ifeq ($(config-targets),1)
 356 # ===========================================================================
 357 # *config targets only - make sure prerequisites are updated, and descend
 358 # in scripts/kconfig to make the *config target
 359
 360 %config: scripts/fixdep FORCE
 361         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 362 config : scripts/fixdep FORCE
 363         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 364
 365 else
 366 # ===========================================================================
 367 # Build targets only - this includes vmlinux, arch specific targets, clean
 368 # targets and others. In general all targets except *config targets.
 369
 370 # That's our default target when none is given on the command line
 371 # Note that 'modules' will be added as a prerequisite as well,
 372 # in the CONFIG_MODULES part below
 373
 374 all:    vmlinux
 375
 376 # Objects we will link into vmlinux / subdirs we need to visit
 377 init-y          := init/
 378 drivers-y       := drivers/ sound/
 379 net-y           := net/
 380 libs-y          := lib/
 381 core-y          := usr/
 382 SUBDIRS         :=
 383
 384 ifeq ($(dot-config),1)
 385 # In this section, we need .config
 386
 387 # Read in dependencies to all Kconfig* files, make sure to run
 388 # oldconfig if changes are detected.
 389 -include .config.cmd
 390
 391 include .config
 392
 393 # If .config needs to be updated, it will be done via the dependency
 394 # that autoconf has on .config.
 395 # To avoid any implicit rule to kick in, define an empty command
 396 .config: ;
 397
 398 # If .config is newer than include/linux/autoconf.h, someone tinkered
 399 # with it and forgot to run make oldconfig
 400 include/linux/autoconf.h: .config
 401         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 402
 403 endif
 404
 405 include $(srctree)/arch/$(ARCH)/Makefile
 406
 407 # Let architecture Makefiles change CPPFLAGS if needed
 408 CFLAGS := $(CPPFLAGS) $(CFLAGS)
 409 AFLAGS := $(CPPFLAGS) $(AFLAGS)
 410
 411 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/
 412
 413 SUBDIRS         += $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 414                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 415                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 416
 417 ALL_SUBDIRS     := $(sort $(SUBDIRS) $(patsubst %/,%,$(filter %/, \
 418                      $(init-n) $(init-) \
 419                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 420                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 421
 422 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 423 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 424 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 425 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 426 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 427 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 428 libs-y          := $(libs-y1) $(libs-y2)
 429
 430 # Here goes the main Makefile
 431 # ---------------------------------------------------------------------------
 432
 433
 434 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 435 CFLAGS          += -Os
 436 else
 437 CFLAGS          += -O2
 438 endif
 439
 440 ifndef CONFIG_FRAME_POINTER
 441 CFLAGS          += -fomit-frame-pointer
 442 endif
 443
 444 ifdef CONFIG_DEBUG_INFO
 445 CFLAGS          += -g
 446 endif
 447
 448 # warn about C99 declaration after statement
 449 CFLAGS += $(call check_gcc,-Wdeclaration-after-statement,)
 450
 451 #
 452 # INSTALL_PATH specifies where to place the updated kernel and system map
 453 # images.  Uncomment if you want to place them anywhere other than root.
 454 #
 455
 456 #export INSTALL_PATH=/boot
 457
 458 #
 459 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 460 # relocations required by build roots.  This is not defined in the
 461 # makefile but the arguement can be passed to make if needed.
 462 #
 463
 464 MODLIB  := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 465 export MODLIB
 466
 467 # Build vmlinux
 468 # ---------------------------------------------------------------------------
 469
 470 #       This is a bit tricky: If we need to relink vmlinux, we want
 471 #       the version number incremented, which means recompile init/version.o
 472 #       and relink init/init.o. However, we cannot do this during the
 473 #       normal descending-into-subdirs phase, since at that time
 474 #       we cannot yet know if we will need to relink vmlinux.
 475 #       So we descend into init/ inside the rule for vmlinux again.
 476 head-y += $(HEAD)
 477 vmlinux-objs := $(head-y) $(init-y) $(core-y) $(libs-y) $(drivers-y) $(net-y)
 478
 479 quiet_cmd_vmlinux__ = LD      $@
 480 define cmd_vmlinux__
 481         $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) $(head-y) $(init-y) \
 482         --start-group \
 483         $(core-y) \
 484         $(libs-y) \
 485         $(drivers-y) \
 486         $(net-y) \
 487         --end-group \
 488         $(filter .tmp_kallsyms%,$^) \
 489         -o $@
 490 endef
 491
 492 #       set -e makes the rule exit immediately on error
 493
 494 define rule_vmlinux__
 495         +set -e;                                                        \
 496         $(if $(filter .tmp_kallsyms%,$^),,                              \
 497           echo '  GEN     .version';                                    \
 498           . $(srctree)/scripts/mkversion > .tmp_version;                \
 499           mv -f .tmp_version .version;                                  \
 500           $(MAKE) $(build)=init;                                        \
 501         )                                                               \
 502         $(if $($(quiet)cmd_vmlinux__),                                  \
 503           echo '  $($(quiet)cmd_vmlinux__)' &&)                         \
 504         $(cmd_vmlinux__);                                               \
 505         echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 506 endef
 507
 508 define rule_vmlinux
 509         $(rule_vmlinux__); \
 510         $(NM) $@ | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > System.map
 511 endef
 512
 513 LDFLAGS_vmlinux += -T arch/$(ARCH)/kernel/vmlinux.lds.s
 514
 515 #       Generate section listing all symbols and add it into vmlinux
 516 #       It's a three stage process:
 517 #       o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 518 #         empty
 519 #         Running kallsyms on that gives us .tmp_kallsyms1.o with
 520 #         the right size
 521 #       o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 522 #         but due to the added section, some addresses have shifted
 523 #         From here, we generate a correct .tmp_kallsyms2.o
 524 #       o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 525
 526 ifdef CONFIG_KALLSYMS
 527
 528 kallsyms.o := .tmp_kallsyms2.o
 529
 530 quiet_cmd_kallsyms = KSYM    $@
 531 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) > $@
 532
 533 .tmp_kallsyms1.o .tmp_kallsyms2.o: %.o: %.S scripts FORCE
 534         $(call if_changed_dep,as_o_S)
 535
 536 .tmp_kallsyms%.S: .tmp_vmlinux%
 537         $(call cmd,kallsyms)
 538
 539 .tmp_vmlinux1: $(vmlinux-objs) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 540         +$(call if_changed_rule,vmlinux__)
 541
 542 .tmp_vmlinux2: $(vmlinux-objs) .tmp_kallsyms1.o arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 543         $(call if_changed_rule,vmlinux__)
 544
 545 endif
 546
 547 #       Finally the vmlinux rule
 548
 549 vmlinux: $(vmlinux-objs) $(kallsyms.o) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 550         $(call if_changed_rule,vmlinux)
 551
 552 #       The actual objects are generated when descending,
 553 #       make sure no implicit rule kicks in
 554
 555 $(sort $(vmlinux-objs)) arch/$(ARCH)/kernel/vmlinux.lds.s: $(SUBDIRS) ;
 556
 557 #       Handle descending into subdirectories listed in $(SUBDIRS)
 558
 559 .PHONY: $(SUBDIRS)
 560 $(SUBDIRS): prepare-all
 561         $(Q)$(MAKE) $(build)=$@
 562
 563 # Things we need to do before we recursively start building the kernel
 564 # or the modules are listed in "prepare-all".
 565 # A multi level approach is used. prepare1 is updated first, then prepare0.
 566 # prepare-all is the collection point for the prepare targets.
 567
 568 .PHONY: prepare-all prepare prepare0 prepare1
 569
 570 # prepare1 is used to check if we are building in a separate output directory,
 571 # and if so do:
 572 # 1) Check that make has not been executed in the kernel src $(srctree)
 573 # 2) Create the include2 directory, used for the second asm symlink
 574
 575 prepare1:
 576 ifneq ($(KBUILD_SRC),)
 577         @echo '  Using $(srctree) as source for kernel'
 578         $(Q)if [ -h $(srctree)/include/asm -o -f $(srctree)/.config ]; then \
 579                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 580                 echo "  in the '$(srctree)' directory.";\
 581                 /bin/false; \
 582         fi;
 583         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 584         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 585 endif
 586
 587 prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
 588 ifdef KBUILD_MODULES
 589 ifeq ($(origin SUBDIRS),file)
 590         $(Q)rm -rf $(MODVERDIR)
 591 else
 592         @echo '*** Warning: Overriding SUBDIRS on the command line can cause'
 593         @echo '***          inconsistencies'
 594 endif
 595 endif
 596         $(if $(CONFIG_MODULES),$(Q)mkdir -p $(MODVERDIR))
 597
 598 # All the preparing..
 599 prepare-all: prepare0 prepare
 600
 601 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 602 #       done in arch/$(ARCH)/kernel/Makefile
 603
 604 export AFLAGS_vmlinux.lds.o += -P -C -U$(ARCH)
 605
 606 # Single targets
 607 # ---------------------------------------------------------------------------
 608
 609 %.s: %.c scripts FORCE
 610         $(Q)$(MAKE) $(build)=$(@D) $@
 611 %.i: %.c scripts FORCE
 612         $(Q)$(MAKE) $(build)=$(@D) $@
 613 %.o: %.c scripts FORCE
 614         $(Q)$(MAKE) $(build)=$(@D) $@
 615 %/:      scripts prepare FORCE
 616         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
 617 %.lst: %.c scripts FORCE
 618         $(Q)$(MAKE) $(build)=$(@D) $@
 619 %.s: %.S scripts FORCE
 620         $(Q)$(MAKE) $(build)=$(@D) $@
 621 %.o: %.S scripts FORCE
 622         $(Q)$(MAKE) $(build)=$(@D) $@
 623
 624 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 625 #       hard to detect, but I suppose "make mrproper" is a good idea
 626 #       before switching between archs anyway.
 627
 628 include/asm:
 629         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 630         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 631         @ln -fsn asm-$(ARCH) $@
 632
 633 #       Split autoconf.h into include/linux/config/*
 634
 635 include/config/MARKER: scripts/split-include include/linux/autoconf.h
 636         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 637         @scripts/split-include include/linux/autoconf.h include/config
 638         @touch $@
 639
 640 # Generate some files
 641 # ---------------------------------------------------------------------------
 642
 643 #       version.h changes when $(KERNELRELEASE) etc change, as defined in
 644 #       this Makefile
 645
 646 uts_len := 64
 647
 648 define filechk_version.h
 649         if expr length "$(KERNELRELEASE)" \> $(uts_len) >/dev/null ; then \
 650           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 651           exit 1; \
 652         fi; \
 653         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 654           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 655          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 656         )
 657 endef
 658
 659 include/linux/version.h: Makefile
 660         $(call filechk,version.h)
 661
 662 # ---------------------------------------------------------------------------
 663
 664 .PHONY: depend dep
 665 depend dep:
 666         @echo '*** Warning: make $@ is unnecessary now.'
 667
 668 # ---------------------------------------------------------------------------
 669 # Modules
 670
 671 ifdef CONFIG_MODULES
 672
 673 #       By default, build modules as well
 674
 675 all: modules
 676
 677 #       Build modules
 678
 679 .PHONY: modules
 680 modules: $(SUBDIRS) $(if $(KBUILD_BUILTIN),vmlinux)
 681         @echo '  Building modules, stage 2.';
 682         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 683
 684 #       Install modules
 685
 686 .PHONY: modules_install
 687 modules_install: _modinst_ _modinst_post
 688
 689 .PHONY: _modinst_
 690 _modinst_:
 691         @if [ -z "`$(DEPMOD) -V | grep module-init-tools`" ]; then \
 692                 echo "Warning: you may need to install module-init-tools"; \
 693                 echo "See http://www.codemonkey.org.uk/post-halloween-2.5.txt";\
 694                 sleep 1; \
 695         fi
 696         @rm -rf $(MODLIB)/kernel
 697         @rm -f $(MODLIB)/build
 698         @mkdir -p $(MODLIB)/kernel
 699         @ln -s $(TOPDIR) $(MODLIB)/build
 700         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 701
 702 # If System.map exists, run depmod.  This deliberately does not have a
 703 # dependency on System.map since that would run the dependency tree on
 704 # vmlinux.  This depmod is only for convenience to give the initial
 705 # boot a modules.dep even before / is mounted read-write.  However the
 706 # boot script depmod is the master version.
 707 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 708 depmod_opts     :=
 709 else
 710 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 711 endif
 712 .PHONY: _modinst_post
 713 _modinst_post: _modinst_
 714         if [ -r System.map ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 715
 716 else # CONFIG_MODULES
 717
 718 # Modules not configured
 719 # ---------------------------------------------------------------------------
 720
 721 modules modules_install: FORCE
 722         @echo
 723         @echo "The present kernel configuration has modules disabled."
 724         @echo "Type 'make config' and enable loadable module support."
 725         @echo "Then build a kernel with module support enabled."
 726         @echo
 727         @exit 1
 728
 729 endif # CONFIG_MODULES
 730
 731 # Generate asm-offsets.h
 732 # ---------------------------------------------------------------------------
 733
 734 define filechk_gen-asm-offsets
 735         (set -e; \
 736          echo "#ifndef __ASM_OFFSETS_H__"; \
 737          echo "#define __ASM_OFFSETS_H__"; \
 738          echo "/*"; \
 739          echo " * DO NOT MODIFY."; \
 740          echo " *"; \
 741          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 742          echo " *"; \
 743          echo " */"; \
 744          echo ""; \
 745          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 746          echo ""; \
 747          echo "#endif" )
 748 endef
 749
 750
 751 ###
 752 # Cleaning is done on three levels.
 753 # make clean     Delete all automatically generated files, including
 754 #                tools and firmware.
 755 # make mrproper  Delete the current configuration, and related files
 756 #                Any core files spread around are deleted as well
 757 # make distclean Remove editor backup files, patch leftover files and the like
 758
 759 # Files removed with 'make clean'
 760 CLEAN_FILES += vmlinux System.map MC*
 761
 762 # Files removed with 'make mrproper'
 763 MRPROPER_FILES += \
 764         include/linux/autoconf.h include/linux/version.h \
 765         .version .config .config.old config.in config.old \
 766         .menuconfig.log \
 767         include/asm \
 768         .hdepend include/linux/modversions.h \
 769         tags TAGS cscope* kernel.spec \
 770         .tmp*
 771
 772 # Directories removed with 'make mrproper'
 773 MRPROPER_DIRS += \
 774         $(MODVERDIR) \
 775         .tmp_export-objs \
 776         include/config \
 777         include/linux/modules \
 778         include2
 779
 780 # clean - Delete all intermediate files
 781 #
 782 clean-dirs += $(addprefix _clean_,$(ALL_SUBDIRS) Documentation/DocBook scripts)
 783 .PHONY: $(clean-dirs) clean archclean mrproper archmrproper distclean
 784 $(clean-dirs):
 785         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 786
 787 quiet_cmd_rmclean = RM  $$(CLEAN_FILES)
 788 cmd_rmclean       = rm -f $(CLEAN_FILES)
 789 clean: archclean $(clean-dirs)
 790         $(call cmd,rmclean)
 791         @find . $(RCS_FIND_IGNORE) \
 792                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 793                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 794                 -type f -print | xargs rm -f
 795
 796 # mrproper - delete configuration + modules + core files
 797 #
 798 quiet_cmd_mrproper = RM  $$(MRPROPER_DIRS) + $$(MRPROPER_FILES)
 799 cmd_mrproper = rm -rf $(MRPROPER_DIRS) && rm -f $(MRPROPER_FILES)
 800 mrproper distclean: clean archmrproper
 801         @echo '  Making $@ in the srctree'
 802         @find . $(RCS_FIND_IGNORE) \
 803                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 804                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 805                 -o -name '.*.rej' -o -size 0 \
 806                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
 807                 -type f -print | xargs rm -f
 808         $(call cmd,mrproper)
 809
 810 # Generate tags for editors
 811 # ---------------------------------------------------------------------------
 812
 813 define all-sources
 814         ( find . $(RCS_FIND_IGNORE) \
 815                \( -name include -o -name arch \) -prune -o \
 816                -name '*.[chS]' -print; \
 817           find arch/$(ARCH) $(RCS_FIND_IGNORE) \
 818                -name '*.[chS]' -print; \
 819           find include $(RCS_FIND_IGNORE) \
 820                \( -name config -o -name 'asm-*' \) -prune \
 821                -o -name '*.[chS]' -print; \
 822           find include/asm-$(ARCH) $(RCS_FIND_IGNORE) \
 823                -name '*.[chS]' -print; \
 824           find include/asm-generic $(RCS_FIND_IGNORE) \
 825                -name '*.[chS]' -print )
 826 endef
 827
 828 quiet_cmd_cscope = MAKE   $@
 829 cmd_cscope = $(all-sources) | cscope -k -b -i -
 830
 831 quiet_cmd_TAGS = MAKE   $@
 832 cmd_TAGS = $(all-sources) | etags -
 833
 834 #       Exuberant ctags works better with -I
 835
 836 quiet_cmd_tags = MAKE   $@
 837 define cmd_tags
 838         rm -f $@; \
 839         CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
 840         $(all-sources) | xargs ctags $$CTAGSF -a
 841 endef
 842
 843 cscope: FORCE
 844         $(call cmd,cscope)
 845
 846 TAGS: FORCE
 847         $(call cmd,TAGS)
 848
 849 tags: FORCE
 850         $(call cmd,tags)
 851
 852 # RPM target
 853 # ---------------------------------------------------------------------------
 854
 855 .PHONY: rpm
 856
 857 # Remove hyphens since they have special meaning in RPM filenames
 858 KERNELPATH=kernel-$(subst -,,$(KERNELRELEASE))
 859
 860 #       If you do a make spec before packing the tarball you can rpm -ta it
 861
 862 spec:
 863         $(CONFIG_SHELL) $(srctree)/scripts/mkspec > $(objtree)/kernel.spec
 864
 865 #       a) Build a tar ball
 866 #       b) generate an rpm from it
 867 #       c) and pack the result
 868 #       - Use /. to avoid tar packing just the symlink
 869
 870 rpm:    clean spec
 871         set -e; \
 872         cd .. ; \
 873         ln -sf $(srctree) $(KERNELPATH) ; \
 874         tar -cvz $(RCS_TAR_IGNORE) -f $(KERNELPATH).tar.gz $(KERNELPATH)/. ; \
 875         rm $(KERNELPATH)
 876
 877         set -e; \
 878         $(CONFIG_SHELL) $(srctree)/scripts/mkversion > $(objtree)/.tmp_version;\
 879         mv -f $(objtree)/.tmp_version $(objtree)/.version;
 880
 881         $(RPM) --target $(UTS_MACHINE) -ta ../$(KERNELPATH).tar.gz
 882         rm ../$(KERNELPATH).tar.gz
 883
 884 # Brief documentation of the typical targets used
 885 # ---------------------------------------------------------------------------
 886
 887 help:
 888         @echo  'Cleaning targets:'
 889         @echo  '  clean           - remove most generated files but keep the config'
 890         @echo  '  mrproper        - remove all generated files + config + various backup files'
 891         @echo  ''
 892         @echo  'Configuration targets:'
 893         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
 894         @echo  ''
 895         @echo  'Other generic targets:'
 896         @echo  '  all             - Build all targets marked with [*]'
 897         @echo  '* vmlinux         - Build the bare kernel'
 898         @echo  '* modules         - Build all modules'
 899         @echo  '  modules_install - Install all modules'
 900         @echo  '  dir/            - Build all files in dir and below'
 901         @echo  '  dir/file.[ois]  - Build specified target only'
 902         @echo  '  rpm             - Build a kernel as an RPM package'
 903         @echo  '  tags/TAGS       - Generate tags file for editors'
 904         @echo  ''
 905         @echo  'Documentation targets:'
 906         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
 907         @echo  ''
 908         @echo  'Architecture specific targets ($(ARCH)):'
 909         @$(if $(archhelp),$(archhelp),\
 910                 echo '  No architecture specific help defined for $(ARCH)')
 911         @echo  ''
 912         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
 913         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
 914         @echo  '  make C=1   [targets] Check all c source with checker tool'
 915         @echo  ''
 916         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
 917         @echo  'For further info see the ./README file'
 918
 919
 920 # Documentation targets
 921 # ---------------------------------------------------------------------------
 922 %docs: scripts/docproc FORCE
 923         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
 924
 925 # Scripts to check various things for consistency
 926 # ---------------------------------------------------------------------------
 927
 928 configcheck:
 929         find * $(RCS_FIND_IGNORE) \
 930                 -name '*.[hcS]' -type f -print | sort \
 931                 | xargs $(PERL) -w scripts/checkconfig.pl
 932
 933 includecheck:
 934         find * $(RCS_FIND_IGNORE) \
 935                 -name '*.[hcS]' -type f -print | sort \
 936                 | xargs $(PERL) -w scripts/checkincludes.pl
 937
 938 versioncheck:
 939         find * $(RCS_FIND_IGNORE) \
 940                 -name '*.[hcS]' -type f -print | sort \
 941                 | xargs $(PERL) -w scripts/checkversion.pl
 942
 943 endif #ifeq ($(config-targets),1)
 944 endif #ifeq ($(mixed-targets),1)
 945
 946 # FIXME Should go into a make.lib or something
 947 # ===========================================================================
 948
 949 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
 950           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
 951           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
 952
 953 quiet_cmd_as_o_S = AS      $@
 954 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
 955
 956 # read all saved command lines
 957
 958 targets := $(wildcard $(sort $(targets)))
 959 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 960
 961 ifneq ($(cmd_files),)
 962   $(cmd_files): ;       # Do not try to update included dependency files
 963   include $(cmd_files)
 964 endif
 965
 966 # execute the command and also postprocess generated .d dependencies
 967 # file
 968
 969 if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
 970                           $(filter-out $(cmd_$(1)),$(cmd_$@))\
 971                           $(filter-out $(cmd_$@),$(cmd_$(1)))),\
 972         @set -e; \
 973         $(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
 974         $(cmd_$(1)); \
 975         scripts/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
 976         rm -f $(depfile); \
 977         mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
 978
 979 # Usage: $(call if_changed_rule,foo)
 980 # will check if $(cmd_foo) changed, or any of the prequisites changed,
 981 # and if so will execute $(rule_foo)
 982
 983 if_changed_rule = $(if $(strip $? \
 984                                $(filter-out $(cmd_$(1)),$(cmd_$(@F)))\
 985                                $(filter-out $(cmd_$(@F)),$(cmd_$(1)))),\
 986                        @$(rule_$(1)))
 987
 988 # If quiet is set, only print short version of command
 989
 990 cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
 991
 992 # filechk is used to check if the content of a generated file is updated.
 993 # Sample usage:
 994 # define filechk_sample
 995 #       echo $KERNELRELEASE
 996 # endef
 997 # version.h : Makefile
 998 #       $(call filechk,sample)
 999 # The rule defined shall write to stdout the content of the new file.
1000 # The existing file will be compared with the new one.
1001 # - If no file exist it is created
1002 # - If the content differ the new file is used
1003 # - If they are equal no change, and no timestamp update
1004
1005 define filechk
1006         @set -e;                                \
1007         echo '  CHK     $@';                    \
1008         mkdir -p $(dir $@);                     \
1009         $(filechk_$(1)) < $< > $@.tmp;          \
1010         if [ -r $@ ] && cmp -s $@ $@.tmp; then  \
1011                 rm -f $@.tmp;                   \
1012         else                                    \
1013                 echo '  UPD     $@';            \
1014                 mv -f $@.tmp $@;                \
1015         fi
1016 endef
1017
1018 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1019 # Usage:
1020 # $(Q)$(MAKE) $(build)=dir
1021 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
1022
1023 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1024 # Usage:
1025 # $(Q)$(MAKE) $(clean)=dir
1026 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1027
1028 #       $(call descend,<dir>,<target>)
1029 #       Recursively call a sub-make in <dir> with target <target>
1030 # Usage is deprecated, because make does not see this as an invocation of make.
1031 descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
1032
1033 endif   # skip-makefile
1034
1035 FORCE: