Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 0
   4 EXTRAVERSION = -test1
   5
   6 # *DOCUMENTATION*
   7 # To see a list of typical targets execute "make help"
   8 # More info can be located in ./Documentation/kbuild
   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 # We are using a recursive build, so we need to do a little thinking
  13 # to get the ordering right.
  14 #
  15 # Most importantly: sub-Makefiles should only ever modify files in
  16 # their own directory. If in some directory we have a dependency on
  17 # a file in another dir (which doesn't happen often, but it's of
  18 # unavoidable when linking the built-in.o targets which finally
  19 # turn into vmlinux), we will call a sub make in that other dir, and
  20 # after that we are sure that everything which is in that other dir
  21 # is now up to date.
  22 #
  23 # The only cases where we need to modify files which have global
  24 # effects are thus separated out and done before the recursive
  25 # descending is started. They are now explicitly listed as the
  26 # prepare rule.
  27
  28 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
  29
  30 # SUBARCH tells the usermode build what the underlying arch is.  That is set
  31 # first, and if a usermode build is happening, the "ARCH=um" on the command
  32 # line overrides the setting of ARCH below.  If a native build is happening,
  33 # then ARCH is assigned, getting whatever value it gets normally, and
  34 # SUBARCH is subsequently ignored.
  35
  36 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
  37                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
  38                                   -e s/s390x/s390/ -e s/parisc64/parisc/ )
  39
  40 # Remove hyphens since they have special meaning in RPM filenames
  41 KERNELPATH=kernel-$(subst -,,$(KERNELRELEASE))
  42
  43 # Cross compiling and selecting different set of gcc/bin-utils
  44 # ---------------------------------------------------------------------------
  45 #
  46 # When performing cross compilation for other architectures ARCH shall be set
  47 # to the target architecture. (See arch/* for the possibilities).
  48 # ARCH can be set during invocation of make:
  49 # make ARCH=ia64
  50 # Another way is to have ARCH set in the environment.
  51 # The default ARCH is the host where make is executed.
  52
  53 # CROSS_COMPILE specify the prefix used for all executables used
  54 # during compilation. Only gcc and related bin-utils executables
  55 # are prefixed with $(CROSS_COMPILE).
  56 # CROSS_COMPILE can be set on the command line
  57 # make CROSS_COMPILE=ia64-linux-
  58 # Alternatively CROSS_COMPILE can be set in the environment.
  59 # Default value for CROSS_COMPILE is not to prefix executables
  60 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
  61
  62 ARCH            ?= $(SUBARCH)
  63 CROSS_COMPILE   ?=
  64
  65 # Architecture as present in compile.h
  66 UTS_MACHINE := $(ARCH)
  67
  68 # SHELL used by kbuild
  69 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
  70           else if [ -x /bin/bash ]; then echo /bin/bash; \
  71           else echo sh; fi ; fi)
  72 TOPDIR  := $(CURDIR)
  73
  74 HOSTCC          = gcc
  75 HOSTCXX         = g++
  76 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
  77 HOSTCXXFLAGS    = -O2
  78
  79
  80 #       That's our default target when none is given on the command line
  81 #       Note that 'modules' will be added as a prerequisite as well,
  82 #       in the CONFIG_MODULES part below
  83
  84 all:    vmlinux
  85
  86 #       Decide whether to build built-in, modular, or both.
  87 #       Normally, just do built-in.
  88
  89 KBUILD_MODULES :=
  90 KBUILD_BUILTIN := 1
  91
  92 #       If we have only "make modules", don't compile built-in objects.
  93 #       When we're building modules with modversions, we need to consider
  94 #       the built-in objects during the descend as well, in order to
  95 #       make sure the checksums are uptodate before we record them.
  96
  97 ifeq ($(MAKECMDGOALS),modules)
  98   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
  99 endif
 100
 101 #       If we have "make <whatever> modules", compile modules
 102 #       in addition to whatever we do anyway.
 103 #       Just "make" or "make all" shall build modules as well
 104
 105 ifneq ($(filter all modules,$(MAKECMDGOALS)),)
 106   KBUILD_MODULES := 1
 107 endif
 108
 109 ifeq ($(MAKECMDGOALS),)
 110   KBUILD_MODULES := 1
 111 endif
 112
 113 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE KBUILD_CHECKSRC
 114
 115 # Beautify output
 116 # ---------------------------------------------------------------------------
 117 #
 118 # Normally, we echo the whole command before executing it. By making
 119 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 120 # $(quiet) to choose other forms of output instead, e.g.
 121 #
 122 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 123 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 124 #
 125 # If $(quiet) is empty, the whole command will be printed.
 126 # If it is set to "quiet_", only the short version will be printed.
 127 # If it is set to "silent_", nothing wil be printed at all, since
 128 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 129
 130 # To put more focus on warnings, less verbose as default
 131
 132 ifdef V
 133   ifeq ("$(origin V)", "command line")
 134     KBUILD_VERBOSE = $(V)
 135   endif
 136 endif
 137 ifndef KBUILD_VERBOSE
 138   KBUILD_VERBOSE = 0
 139 endif
 140
 141 ifdef C
 142   ifeq ("$(origin C)", "command line")
 143     KBUILD_CHECKSRC = $(C)
 144   endif
 145 endif
 146 ifndef KBUILD_CHECKSRC
 147   KBUILD_CHECKSRC = 0
 148 endif
 149
 150
 151 MAKEFLAGS += --no-print-directory
 152
 153 # For maximum performance (+ possibly random breakage, uncomment
 154 # the following)
 155
 156 #MAKEFLAGS += -rR
 157
 158 #       If the user wants quiet mode, echo short versions of the commands
 159 #       only
 160
 161 ifeq ($(KBUILD_VERBOSE),1)
 162   quiet =
 163   Q =
 164 else
 165   quiet=quiet_
 166   Q = @
 167 endif
 168
 169 #       If the user is running make -s (silent mode), suppress echoing of
 170 #       commands
 171
 172 ifneq ($(findstring s,$(MAKEFLAGS)),)
 173   quiet=silent_
 174 endif
 175
 176 export quiet Q KBUILD_VERBOSE
 177
 178 #       Paths to obj / src tree
 179
 180 src     := .
 181 obj     := .
 182 srctree := .
 183 objtree := .
 184
 185 export srctree objtree
 186
 187 #       Make variables (CC, etc...)
 188
 189 AS              = $(CROSS_COMPILE)as
 190 LD              = $(CROSS_COMPILE)ld
 191 CC              = $(CROSS_COMPILE)gcc
 192 CPP             = $(CC) -E
 193 AR              = $(CROSS_COMPILE)ar
 194 NM              = $(CROSS_COMPILE)nm
 195 STRIP           = $(CROSS_COMPILE)strip
 196 OBJCOPY         = $(CROSS_COMPILE)objcopy
 197 OBJDUMP         = $(CROSS_COMPILE)objdump
 198 AWK             = awk
 199 RPM             := $(shell if [ -x "/usr/bin/rpmbuild" ]; then echo rpmbuild; \
 200                         else echo rpm; fi)
 201 GENKSYMS        = scripts/genksyms/genksyms
 202 DEPMOD          = /sbin/depmod
 203 KALLSYMS        = scripts/kallsyms
 204 PERL            = perl
 205 CHECK           = sparse
 206 MODFLAGS        = -DMODULE
 207 CFLAGS_MODULE   = $(MODFLAGS)
 208 AFLAGS_MODULE   = $(MODFLAGS)
 209 LDFLAGS_MODULE  = -r
 210 CFLAGS_KERNEL   =
 211 AFLAGS_KERNEL   =
 212
 213 NOSTDINC_FLAGS  = -nostdinc -iwithprefix include
 214
 215 CPPFLAGS        := -D__KERNEL__ -Iinclude
 216 CFLAGS          := $(CPPFLAGS) -Wall -Wstrict-prototypes -Wno-trigraphs -O2 \
 217                    -fno-strict-aliasing -fno-common
 218 AFLAGS          := -D__ASSEMBLY__ $(CPPFLAGS)
 219
 220 export  VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
 221         CONFIG_SHELL TOPDIR HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 222         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 223         HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB LDFLAGS_MODULE CHECK
 224
 225 export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFLAGS LDFLAGS
 226 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 227 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 228
 229 export MODVERDIR := .tmp_versions
 230
 231 # The temporary file to save gcc -MD generated dependencies must not
 232 # contain a comma
 233 comma := ,
 234 depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
 235
 236 noconfig_targets := xconfig gconfig menuconfig config oldconfig randconfig \
 237                     defconfig allyesconfig allnoconfig allmodconfig \
 238                     clean mrproper distclean rpm \
 239                     help tags TAGS cscope sgmldocs psdocs pdfdocs htmldocs \
 240                     checkconfig checkhelp checkincludes
 241
 242 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \) -prune -o
 243 RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS
 244
 245 # Helpers built in scripts/
 246 # ---------------------------------------------------------------------------
 247
 248 scripts/docproc scripts/fixdep scripts/split-include : scripts ;
 249
 250 .PHONY: scripts
 251 scripts:
 252         $(Q)$(MAKE) $(build)=scripts
 253
 254 # Objects we will link into vmlinux / subdirs we need to visit
 255 # ---------------------------------------------------------------------------
 256
 257 init-y          := init/
 258 drivers-y       := drivers/ sound/
 259 net-y           := net/
 260 libs-y          := lib/
 261 core-y          := usr/
 262 SUBDIRS         :=
 263
 264 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
 265
 266 export include_config := 1
 267
 268 -include .config
 269
 270 endif
 271
 272 include arch/$(ARCH)/Makefile
 273
 274 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/
 275
 276 SUBDIRS         += $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 277                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 278                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 279
 280 ALL_SUBDIRS     := $(sort $(SUBDIRS) $(patsubst %/,%,$(filter %/, \
 281                      $(init-n) $(init-) \
 282                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 283                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 284
 285 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 286 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 287 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 288 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 289 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 290 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 291 libs-y          := $(libs-y1) $(libs-y2)
 292
 293 ifdef include_config
 294
 295 # Here goes the main Makefile
 296 # ===========================================================================
 297 #
 298 # If the user gave a *config target, it'll be handled in another
 299 # section below, since in this case we cannot include .config
 300 # Same goes for other targets like clean/mrproper etc, which
 301 # don't need .config, either
 302
 303 #       In this section, we need .config
 304
 305 -include .config.cmd
 306
 307 ifndef CONFIG_FRAME_POINTER
 308 CFLAGS          += -fomit-frame-pointer
 309 endif
 310
 311 #
 312 # INSTALL_PATH specifies where to place the updated kernel and system map
 313 # images.  Uncomment if you want to place them anywhere other than root.
 314 #
 315
 316 #export INSTALL_PATH=/boot
 317
 318 #
 319 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 320 # relocations required by build roots.  This is not defined in the
 321 # makefile but the arguement can be passed to make if needed.
 322 #
 323
 324 MODLIB  := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 325 export MODLIB
 326
 327 # Build vmlinux
 328 # ---------------------------------------------------------------------------
 329
 330 #       This is a bit tricky: If we need to relink vmlinux, we want
 331 #       the version number incremented, which means recompile init/version.o
 332 #       and relink init/init.o. However, we cannot do this during the
 333 #       normal descending-into-subdirs phase, since at that time
 334 #       we cannot yet know if we will need to relink vmlinux.
 335 #       So we descend into init/ inside the rule for vmlinux again.
 336 head-y += $(HEAD)
 337 vmlinux-objs := $(head-y) $(init-y) $(core-y) $(libs-y) $(drivers-y) $(net-y)
 338
 339 quiet_cmd_vmlinux__ = LD      $@
 340 define cmd_vmlinux__
 341         $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) $(head-y) $(init-y) \
 342         --start-group \
 343         $(core-y) \
 344         $(libs-y) \
 345         $(drivers-y) \
 346         $(net-y) \
 347         --end-group \
 348         $(filter .tmp_kallsyms%,$^) \
 349         -o $@
 350 endef
 351
 352 #       set -e makes the rule exit immediately on error
 353
 354 define rule_vmlinux__
 355         set -e;                                                         \
 356         $(if $(filter .tmp_kallsyms%,$^),,                              \
 357           echo '  GEN     .version';                                    \
 358           . $(srctree)/scripts/mkversion > .tmp_version;                \
 359           mv -f .tmp_version .version;                                  \
 360           $(MAKE) $(build)=init;                                        \
 361         )                                                               \
 362         $(if $($(quiet)cmd_vmlinux__),                                  \
 363           echo '  $($(quiet)cmd_vmlinux__)' &&)                         \
 364         $(cmd_vmlinux__);                                               \
 365         echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 366 endef
 367
 368 define rule_vmlinux
 369         $(rule_vmlinux__); \
 370         $(NM) $@ | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > System.map
 371 endef
 372
 373 LDFLAGS_vmlinux += -T arch/$(ARCH)/vmlinux.lds.s
 374
 375 #       Generate section listing all symbols and add it into vmlinux
 376 #       It's a three stage process:
 377 #       o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 378 #         empty
 379 #         Running kallsyms on that gives us .tmp_kallsyms1.o with
 380 #         the right size
 381 #       o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 382 #         but due to the added section, some addresses have shifted
 383 #         From here, we generate a correct .tmp_kallsyms2.o
 384 #       o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 385
 386 ifdef CONFIG_KALLSYMS
 387
 388 kallsyms.o := .tmp_kallsyms2.o
 389
 390 quiet_cmd_kallsyms = KSYM    $@
 391 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) > $@
 392
 393 .tmp_kallsyms1.o .tmp_kallsyms2.o: %.o: %.S scripts FORCE
 394         $(call if_changed_dep,as_o_S)
 395
 396 .tmp_kallsyms%.S: .tmp_vmlinux%
 397         $(call cmd,kallsyms)
 398
 399 .tmp_vmlinux1: $(vmlinux-objs) arch/$(ARCH)/vmlinux.lds.s FORCE
 400         +$(call if_changed_rule,vmlinux__)
 401
 402 .tmp_vmlinux2: $(vmlinux-objs) .tmp_kallsyms1.o arch/$(ARCH)/vmlinux.lds.s FORCE
 403         $(call if_changed_rule,vmlinux__)
 404
 405 endif
 406
 407 #       Finally the vmlinux rule
 408
 409 vmlinux: $(vmlinux-objs) $(kallsyms.o) arch/$(ARCH)/vmlinux.lds.s FORCE
 410         $(call if_changed_rule,vmlinux)
 411
 412 #       The actual objects are generated when descending,
 413 #       make sure no implicit rule kicks in
 414
 415 $(sort $(vmlinux-objs)): $(SUBDIRS) ;
 416
 417 #       Handle descending into subdirectories listed in $(SUBDIRS)
 418
 419 .PHONY: $(SUBDIRS)
 420 $(SUBDIRS): prepare
 421         $(Q)$(MAKE) $(build)=$@
 422
 423 #       Things we need done before we descend to build or make
 424 #       module versions are listed in "prepare"
 425
 426 .PHONY: prepare
 427 prepare: include/linux/version.h include/asm include/config/MARKER
 428 ifdef KBUILD_MODULES
 429 ifeq ($(origin SUBDIRS),file)
 430         $(Q)rm -rf $(MODVERDIR)
 431 else
 432         @echo '*** Warning: Overriding SUBDIRS on the command line can cause'
 433         @echo '***          inconsistencies'
 434 endif
 435 endif
 436         $(if $(CONFIG_MODULES),$(Q)mkdir -p $(MODVERDIR))
 437
 438 #       This can be used by arch/$ARCH/Makefile to preprocess
 439 #       their vmlinux.lds.S file
 440
 441 AFLAGS_vmlinux.lds.o += -P -C -U$(ARCH)
 442
 443 arch/$(ARCH)/vmlinux.lds.s: %.s: %.S scripts FORCE
 444         $(call if_changed_dep,as_s_S)
 445
 446 targets += arch/$(ARCH)/vmlinux.lds.s
 447
 448 # Single targets
 449 # ---------------------------------------------------------------------------
 450
 451 %.s: %.c scripts FORCE
 452         $(Q)$(MAKE) $(build)=$(@D) $@
 453 %.i: %.c scripts FORCE
 454         $(Q)$(MAKE) $(build)=$(@D) $@
 455 %.o: %.c scripts FORCE
 456         $(Q)$(MAKE) $(build)=$(@D) $@
 457 %/:      scripts prepare FORCE
 458         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
 459 %.lst: %.c scripts FORCE
 460         $(Q)$(MAKE) $(build)=$(@D) $@
 461 %.s: %.S scripts FORCE
 462         $(Q)$(MAKE) $(build)=$(@D) $@
 463 %.o: %.S scripts FORCE
 464         $(Q)$(MAKE) $(build)=$(@D) $@
 465
 466 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 467 #       hard to detect, but I suppose "make mrproper" is a good idea
 468 #       before switching between archs anyway.
 469
 470 include/asm:
 471         @echo '  Making asm->asm-$(ARCH) symlink'
 472         @ln -s asm-$(ARCH) $@
 473
 474 #       Split autoconf.h into include/linux/config/*
 475
 476 include/config/MARKER: scripts/split-include include/linux/autoconf.h
 477         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 478         @scripts/split-include include/linux/autoconf.h include/config
 479         @touch $@
 480
 481 #       if .config is newer than include/linux/autoconf.h, someone tinkered
 482 #       with it and forgot to run make oldconfig
 483
 484 include/linux/autoconf.h: .config scripts/fixdep
 485         $(Q)$(MAKE) $(build)=scripts/kconfig scripts/kconfig/conf
 486         ./scripts/kconfig/conf -s arch/$(ARCH)/Kconfig
 487
 488 # Generate some files
 489 # ---------------------------------------------------------------------------
 490
 491 #       version.h changes when $(KERNELRELEASE) etc change, as defined in
 492 #       this Makefile
 493
 494 uts_len := 64
 495
 496 define filechk_version.h
 497         if expr length "$(KERNELRELEASE)" \> $(uts_len) >/dev/null ; then \
 498           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 499           exit 1; \
 500         fi; \
 501         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 502           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 503          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 504         )
 505 endef
 506
 507 include/linux/version.h: Makefile
 508         $(call filechk,version.h)
 509
 510 # ---------------------------------------------------------------------------
 511
 512 .PHONY: depend dep
 513 depend dep:
 514         @echo '*** Warning: make $@ is unnecessary now.'
 515
 516 # ---------------------------------------------------------------------------
 517 # Modules
 518
 519 ifdef CONFIG_MODULES
 520
 521 #       By default, build modules as well
 522
 523 all: modules
 524
 525 #       Build modules
 526
 527 .PHONY: modules
 528 modules: $(SUBDIRS) $(if $(KBUILD_BUILTIN),vmlinux)
 529         @echo '  Building modules, stage 2.';
 530         $(Q)$(MAKE) -rR -f scripts/Makefile.modpost
 531
 532 #       Install modules
 533
 534 .PHONY: modules_install
 535 modules_install: _modinst_ _modinst_post
 536
 537 .PHONY: _modinst_
 538 _modinst_:
 539         @rm -rf $(MODLIB)/kernel
 540         @rm -f $(MODLIB)/build
 541         @mkdir -p $(MODLIB)/kernel
 542         @ln -s $(TOPDIR) $(MODLIB)/build
 543         $(Q)$(MAKE) -rR -f scripts/Makefile.modinst
 544
 545 # If System.map exists, run depmod.  This deliberately does not have a
 546 # dependency on System.map since that would run the dependency tree on
 547 # vmlinux.  This depmod is only for convenience to give the initial
 548 # boot a modules.dep even before / is mounted read-write.  However the
 549 # boot script depmod is the master version.
 550 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 551 depmod_opts     :=
 552 else
 553 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 554 endif
 555 .PHONY: _modinst_post
 556 _modinst_post: _modinst_
 557         if [ -r System.map ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 558
 559 else # CONFIG_MODULES
 560
 561 # Modules not configured
 562 # ---------------------------------------------------------------------------
 563
 564 modules modules_install: FORCE
 565         @echo
 566         @echo "The present kernel configuration has modules disabled."
 567         @echo "Type 'make config' and enable loadable module support."
 568         @echo "Then build a kernel with module support enabled."
 569         @echo
 570         @exit 1
 571
 572 endif # CONFIG_MODULES
 573
 574 # Generate asm-offsets.h
 575 # ---------------------------------------------------------------------------
 576
 577 define filechk_gen-asm-offsets
 578         (set -e; \
 579          echo "#ifndef __ASM_OFFSETS_H__"; \
 580          echo "#define __ASM_OFFSETS_H__"; \
 581          echo "/*"; \
 582          echo " * DO NOT MODIFY."; \
 583          echo " *"; \
 584          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 585          echo " *"; \
 586          echo " */"; \
 587          echo ""; \
 588          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 589          echo ""; \
 590          echo "#endif" )
 591 endef
 592
 593 else # ifdef include_config
 594
 595 ifeq ($(filter-out $(noconfig_targets),$(MAKECMDGOALS)),)
 596
 597 # Targets which don't need .config
 598 # ===========================================================================
 599 #
 600 # These targets basically have their own Makefile - not quite, but at
 601 # least its own exclusive section in the same Makefile. The reason for
 602 # this is the following:
 603 # To know the configuration, the main Makefile has to include
 604 # .config. That's a obviously a problem when .config doesn't exist
 605 # yet, but that could be kludged around with only including it if it
 606 # exists.
 607 # However, the larger problem is: If you run make *config, make will
 608 # include the old .config, then execute your *config. It will then
 609 # notice that a piece it included (.config) did change and restart from
 610 # scratch. Which will cause execution of *config again. You get the
 611 # picture.
 612 # If we don't explicitly let the Makefile know that .config is changed
 613 # by *config (the old way), it won't reread .config after *config,
 614 # thus working with possibly stale values - we don't that either.
 615 #
 616 # So we divide things: This part here is for making *config targets,
 617 # and other targets which should work when no .config exists yet.
 618 # The main part above takes care of the rest after a .config exists.
 619
 620 # Kernel configuration
 621 # ---------------------------------------------------------------------------
 622
 623 .PHONY: oldconfig xconfig gconfig menuconfig config \
 624         make_with_config rpm
 625
 626 scripts/kconfig/conf scripts/kconfig/mconf scripts/kconfig/qconf scripts/kconfig/gconf: scripts/fixdep FORCE
 627         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 628
 629 xconfig: scripts/kconfig/qconf
 630         ./scripts/kconfig/qconf arch/$(ARCH)/Kconfig
 631
 632 gconfig: scripts/kconfig/gconf
 633         ./scripts/kconfig/gconf arch/$(ARCH)/Kconfig
 634
 635 menuconfig: scripts/kconfig/mconf
 636         $(Q)$(MAKE) $(build)=scripts/lxdialog
 637         ./scripts/kconfig/mconf arch/$(ARCH)/Kconfig
 638
 639 config: scripts/kconfig/conf
 640         ./scripts/kconfig/conf arch/$(ARCH)/Kconfig
 641
 642 oldconfig: scripts/kconfig/conf
 643         ./scripts/kconfig/conf -o arch/$(ARCH)/Kconfig
 644
 645 randconfig: scripts/kconfig/conf
 646         ./scripts/kconfig/conf -r arch/$(ARCH)/Kconfig
 647
 648 allyesconfig: scripts/kconfig/conf
 649         ./scripts/kconfig/conf -y arch/$(ARCH)/Kconfig
 650
 651 allnoconfig: scripts/kconfig/conf
 652         ./scripts/kconfig/conf -n arch/$(ARCH)/Kconfig
 653
 654 allmodconfig: scripts/kconfig/conf
 655         ./scripts/kconfig/conf -m arch/$(ARCH)/Kconfig
 656
 657 defconfig: scripts/kconfig/conf
 658         ./scripts/kconfig/conf -d arch/$(ARCH)/Kconfig
 659
 660 ###
 661 # Cleaning is done on three levels.
 662 # make clean     Delete all automatically generated files, including
 663 #                tools and firmware.
 664 # make mrproper  Delete the current configuration, and related files
 665 #                Any core files spread around are deleted as well
 666 # make distclean Remove editor backup files, patch leftover files and the like
 667
 668 # Files removed with 'make clean'
 669 CLEAN_FILES += vmlinux System.map MC*
 670
 671 # Files removed with 'make mrproper'
 672 MRPROPER_FILES += \
 673         include/linux/autoconf.h include/linux/version.h \
 674         .version .config .config.old config.in config.old \
 675         .menuconfig.log \
 676         include/asm \
 677         .hdepend include/linux/modversions.h \
 678         tags TAGS cscope kernel.spec \
 679         .tmp*
 680
 681 # Directories removed with 'make mrproper'
 682 MRPROPER_DIRS += \
 683         $(MODVERDIR) \
 684         .tmp_export-objs \
 685         include/config \
 686         include/linux/modules
 687
 688 # clean - Delete all intermediate files
 689 #
 690 clean-dirs += $(addprefix _clean_,$(ALL_SUBDIRS) Documentation/DocBook scripts)
 691 .PHONY: $(clean-dirs) clean archclean mrproper archmrproper distclean
 692 $(clean-dirs):
 693         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 694
 695 quiet_cmd_rmclean = RM  $$(CLEAN_FILES)
 696 cmd_rmclean       = rm -f $(CLEAN_FILES)
 697 clean: archclean $(clean-dirs)
 698         $(call cmd,rmclean)
 699         @find . $(RCS_FIND_IGNORE) \
 700                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 701                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 702                 -type f -print | xargs rm -f
 703
 704 # mrproper - delete configuration + modules + core files
 705 #
 706 quiet_cmd_mrproper = RM  $$(MRPROPER_DIRS) + $$(MRPROPER_FILES)
 707 cmd_mrproper = rm -rf $(MRPROPER_DIRS) && rm -f $(MRPROPER_FILES)
 708 mrproper distclean: clean archmrproper
 709         @echo '  Making $@ in the srctree'
 710         @find . $(RCS_FIND_IGNORE) \
 711                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 712                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 713                 -o -name '.*.rej' -o -size 0 \
 714                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
 715                 -type f -print | xargs rm -f
 716         $(call cmd,mrproper)
 717
 718 # Generate tags for editors
 719 # ---------------------------------------------------------------------------
 720
 721 define all-sources
 722         ( find . $(RCS_FIND_IGNORE) \
 723                \( -name include -o -name arch \) -prune -o \
 724                -name '*.[chS]' -print; \
 725           find arch/$(ARCH) $(RCS_FIND_IGNORE) \
 726                -name '*.[chS]' -print; \
 727           find include $(RCS_FIND_IGNORE) \
 728                \( -name config -o -name 'asm-*' \) -prune \
 729                -o -name '*.[chS]' -print; \
 730           find include/asm-$(ARCH) $(RCS_FIND_IGNORE) \
 731                -name '*.[chS]' -print; \
 732           find include/asm-generic $(RCS_FIND_IGNORE) \
 733                -name '*.[chS]' -print )
 734 endef
 735
 736 quiet_cmd_cscope = MAKE   $@
 737 cmd_cscope = $(all-sources) | cscope -k -b -i -
 738
 739 quiet_cmd_TAGS = MAKE   $@
 740 cmd_TAGS = $(all-sources) | etags -
 741
 742 #       Exuberant ctags works better with -I
 743
 744 quiet_cmd_tags = MAKE   $@
 745 define cmd_tags
 746         rm -f $@; \
 747         CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
 748         $(all-sources) | xargs ctags $$CTAGSF -a
 749 endef
 750
 751 cscope: FORCE
 752         $(call cmd,cscope)
 753
 754 TAGS: FORCE
 755         $(call cmd,TAGS)
 756
 757 tags: FORCE
 758         $(call cmd,tags)
 759
 760 # RPM target
 761 # ---------------------------------------------------------------------------
 762
 763 #       If you do a make spec before packing the tarball you can rpm -ta it
 764
 765 spec:
 766         . $(srctree)/scripts/mkspec >kernel.spec
 767
 768 #       Build a tar ball, generate an rpm from it and pack the result
 769 #       There are two bits of magic here
 770 #       1) The use of /. to avoid tar packing just the symlink
 771 #       2) Removing the .dep files as they have source paths in them that
 772 #          will become invalid
 773
 774 rpm:    clean spec
 775         find . $(RCS_FIND_IGNORE) \
 776                 \( -size 0 -o -name .depend -o -name .hdepend \) \
 777                 -type f -print | xargs rm -f
 778         set -e; \
 779         cd $(TOPDIR)/.. ; \
 780         ln -sf $(TOPDIR) $(KERNELPATH) ; \
 781         tar -cvz $(RCS_TAR_IGNORE) -f $(KERNELPATH).tar.gz $(KERNELPATH)/. ; \
 782         rm $(KERNELPATH) ; \
 783         cd $(TOPDIR) ; \
 784         $(CONFIG_SHELL) $(srctree)/scripts/mkversion > .version ; \
 785         $(RPM) -ta $(TOPDIR)/../$(KERNELPATH).tar.gz ; \
 786         rm $(TOPDIR)/../$(KERNELPATH).tar.gz
 787
 788 # Brief documentation of the typical targets used
 789 # ---------------------------------------------------------------------------
 790
 791 help:
 792         @echo  'Cleaning targets:'
 793         @echo  '  clean           - remove most generated files but keep the config'
 794         @echo  '  mrproper        - remove all generated files + config + various backup files'
 795         @echo  ''
 796         @echo  'Configuration targets:'
 797         @echo  '  oldconfig       - Update current config utilising a line-oriented program'
 798         @echo  '  menuconfig      - Update current config utilising a menu based program'
 799         @echo  '  xconfig         - Update current config utilising a QT based front-end'
 800         @echo  '  gconfig         - Update current config utilising a GTK based front-end'
 801         @echo  '  defconfig       - New config with default answer to all options'
 802         @echo  '  allmodconfig    - New config selecting modules when possible'
 803         @echo  '  allyesconfig    - New config where all options are accepted with yes'
 804         @echo  '  allnoconfig     - New minimal config'
 805         @echo  ''
 806         @echo  'Other generic targets:'
 807         @echo  '  all             - Build all targets marked with [*]'
 808         @echo  '* vmlinux         - Build the bare kernel'
 809         @echo  '* modules         - Build all modules'
 810         @echo  '  modules_install - Install all modules'
 811         @echo  '  dir/            - Build all files in dir and below'
 812         @echo  '  dir/file.[ois]  - Build specified target only'
 813         @echo  '  rpm             - Build a kernel as an RPM package'
 814         @echo  '  tags/TAGS       - Generate tags file for editors'
 815         @echo  ''
 816         @echo  'Documentation targets:'
 817         @$(MAKE) --no-print-directory -f Documentation/DocBook/Makefile dochelp
 818         @echo  ''
 819         @echo  'Architecture specific targets ($(ARCH)):'
 820         @$(if $(archhelp),$(archhelp),\
 821                 echo '  No architecture specific help defined for $(ARCH)')
 822         @echo  ''
 823         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
 824         @echo  '  make C=1   [targets] Check all c source with checker tool'
 825         @echo  ''
 826         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
 827         @echo  'For further info browse Documentation/kbuild/*'
 828
 829
 830 # Documentation targets
 831 # ---------------------------------------------------------------------------
 832 sgmldocs psdocs pdfdocs htmldocs: scripts/docproc FORCE
 833         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
 834
 835 # Scripts to check various things for consistency
 836 # ---------------------------------------------------------------------------
 837
 838 checkconfig:
 839         find * $(RCS_FIND_IGNORE) \
 840                 -name '*.[hcS]' -type f -print | sort \
 841                 | xargs $(PERL) -w scripts/checkconfig.pl
 842
 843 checkincludes:
 844         find * $(RCS_FIND_IGNORE) \
 845                 -name '*.[hcS]' -type f -print | sort \
 846                 | xargs $(PERL) -w scripts/checkincludes.pl
 847
 848 else # ifneq ($(filter-out $(noconfig_targets),$(MAKECMDGOALS)),)
 849
 850 # We're called with both targets which do and do not need
 851 # .config included. Handle them one after the other.
 852 # ===========================================================================
 853
 854 %:: FORCE
 855         $(Q)$(MAKE) $@
 856
 857 endif # ifeq ($(filter-out $(noconfig_targets),$(MAKECMDGOALS)),)
 858 endif # ifdef include_config
 859
 860 # FIXME Should go into a make.lib or something
 861 # ===========================================================================
 862
 863 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) $(NOSTDINC_FLAGS) \
 864           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
 865
 866 quiet_cmd_as_s_S = CPP     $@
 867 cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $<
 868
 869 quiet_cmd_as_o_S = AS      $@
 870 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
 871
 872 # read all saved command lines
 873
 874 targets := $(wildcard $(sort $(targets)))
 875 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 876
 877 ifneq ($(cmd_files),)
 878   include $(cmd_files)
 879 endif
 880
 881 # execute the command and also postprocess generated .d dependencies
 882 # file
 883
 884 if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
 885                           $(filter-out $(cmd_$(1)),$(cmd_$@))\
 886                           $(filter-out $(cmd_$@),$(cmd_$(1)))),\
 887         @set -e; \
 888         $(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
 889         $(cmd_$(1)); \
 890         scripts/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
 891         rm -f $(depfile); \
 892         mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
 893
 894 # Usage: $(call if_changed_rule,foo)
 895 # will check if $(cmd_foo) changed, or any of the prequisites changed,
 896 # and if so will execute $(rule_foo)
 897
 898 if_changed_rule = $(if $(strip $? \
 899                                $(filter-out $(cmd_$(1)),$(cmd_$(@F)))\
 900                                $(filter-out $(cmd_$(@F)),$(cmd_$(1)))),\
 901                        @$(rule_$(1)))
 902
 903 # If quiet is set, only print short version of command
 904
 905 cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
 906
 907 # filechk is used to check if the content of a generated file is updated.
 908 # Sample usage:
 909 # define filechk_sample
 910 #       echo $KERNELRELEASE
 911 # endef
 912 # version.h : Makefile
 913 #       $(call filechk,sample)
 914 # The rule defined shall write to stdout the content of the new file.
 915 # The existing file will be compared with the new one.
 916 # - If no file exist it is created
 917 # - If the content differ the new file is used
 918 # - If they are equal no change, and no timestamp update
 919
 920 define filechk
 921         @set -e;                                \
 922         echo '  CHK     $@';                    \
 923         $(filechk_$(1)) < $< > $@.tmp;          \
 924         if [ -r $@ ] && cmp -s $@ $@.tmp; then  \
 925                 rm -f $@.tmp;                   \
 926         else                                    \
 927                 echo '  UPD     $@';            \
 928                 mv -f $@.tmp $@;                \
 929         fi
 930 endef
 931
 932 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
 933 # Usage:
 934 # $(Q)$(MAKE) $(build)=dir
 935 build := -f scripts/Makefile.build obj
 936
 937 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
 938 # Usage:
 939 # $(Q)$(MAKE) $(clean)=dir
 940 clean := -f scripts/Makefile.clean obj
 941
 942 #       $(call descend,<dir>,<target>)
 943 #       Recursively call a sub-make in <dir> with target <target>
 944 # Usage is deprecated, because make does not see this as an invocation of make.
 945 descend =$(Q)$(MAKE) -f scripts/Makefile.build obj=$(1) $(2)
 946
 947 FORCE: