Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 5
   4 EXTRAVERSION =
   5 NAME=Zonked Quokka
   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 of
  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 = $(C)
  50   endif
  51 endif
  52 ifndef KBUILD_CHECKSRC
  53   KBUILD_CHECKSRC = 0
  54 endif
  55
  56 # kbuild supports saving output files in a separate directory.
  57 # To locate output files in a separate directory two syntax'es are supported.
  58 # In both cases the working directory must be the root of the kernel src.
  59 # 1) O=
  60 # Use "make O=dir/to/store/output/files/"
  61 #
  62 # 2) Set KBUILD_OUTPUT
  63 # Set the environment variable KBUILD_OUTPUT to point to the directory
  64 # where the output files shall be placed.
  65 # export KBUILD_OUTPUT=dir/to/store/output/files/
  66 # make
  67 #
  68 # The O= assigment takes precedence over the KBUILD_OUTPUT environment variable.
  69
  70
  71 # KBUILD_SRC is set on invocation of make in OBJ directory
  72 # KBUILD_SRC is not intended to be used by the regular user (for now)
  73 ifeq ($(KBUILD_SRC),)
  74
  75 # OK, Make called in directory where kernel src resides
  76 # Do we want to locate output files in a separate directory?
  77 ifdef O
  78   ifeq ("$(origin O)", "command line")
  79     KBUILD_OUTPUT := $(O)
  80   endif
  81 endif
  82
  83 # That's our default target when none is given on the command line
  84 .PHONY: all
  85 all:
  86
  87 ifneq ($(KBUILD_OUTPUT),)
  88 # Invoke a second make in the output directory, passing relevant variables
  89 # check that the output directory actually exists
  90 saved-output := $(KBUILD_OUTPUT)
  91 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
  92 $(if $(wildcard $(KBUILD_OUTPUT)),, \
  93      $(error output directory "$(saved-output)" does not exist))
  94
  95 .PHONY: $(MAKECMDGOALS)
  96
  97 $(filter-out all,$(MAKECMDGOALS)) all:
  98         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT)         \
  99         KBUILD_SRC=$(CURDIR)    KBUILD_VERBOSE=$(KBUILD_VERBOSE)        \
 100         KBUILD_CHECK=$(KBUILD_CHECK) -f $(CURDIR)/Makefile $@
 101
 102 # Leave processing to above invocation of make
 103 skip-makefile := 1
 104 endif # ifneq ($(KBUILD_OUTPUT),)
 105 endif # ifeq ($(KBUILD_SRC),)
 106
 107 # We process the rest of the Makefile if this is the final invocation of make
 108 ifeq ($(skip-makefile),)
 109
 110 # Make sure we're not wasting cpu-cycles doing locale handling, yet do make
 111 # sure error messages appear in the user-desired language
 112 ifdef LC_ALL
 113 LANG := $(LC_ALL)
 114 LC_ALL :=
 115 endif
 116 LC_COLLATE := C
 117 LC_CTYPE := C
 118 export LANG LC_ALL LC_COLLATE LC_CTYPE
 119
 120 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 121 TOPDIR          := $(srctree)
 122 # FIXME - TOPDIR is obsolete, use srctree/objtree
 123 objtree         := $(CURDIR)
 124 src             := $(srctree)
 125 obj             := $(objtree)
 126
 127 VPATH           := $(srctree)
 128
 129 export srctree objtree VPATH TOPDIR
 130
 131 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 132
 133 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 134 # first, and if a usermode build is happening, the "ARCH=um" on the command
 135 # line overrides the setting of ARCH below.  If a native build is happening,
 136 # then ARCH is assigned, getting whatever value it gets normally, and
 137 # SUBARCH is subsequently ignored.
 138
 139 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 140                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 141                                   -e s/s390x/s390/ -e s/parisc64/parisc/ )
 142
 143 # Cross compiling and selecting different set of gcc/bin-utils
 144 # ---------------------------------------------------------------------------
 145 #
 146 # When performing cross compilation for other architectures ARCH shall be set
 147 # to the target architecture. (See arch/* for the possibilities).
 148 # ARCH can be set during invocation of make:
 149 # make ARCH=ia64
 150 # Another way is to have ARCH set in the environment.
 151 # The default ARCH is the host where make is executed.
 152
 153 # CROSS_COMPILE specify the prefix used for all executables used
 154 # during compilation. Only gcc and related bin-utils executables
 155 # are prefixed with $(CROSS_COMPILE).
 156 # CROSS_COMPILE can be set on the command line
 157 # make CROSS_COMPILE=ia64-linux-
 158 # Alternatively CROSS_COMPILE can be set in the environment.
 159 # Default value for CROSS_COMPILE is not to prefix executables
 160 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 161
 162 ARCH            ?= $(SUBARCH)
 163 CROSS_COMPILE   ?=
 164
 165 # Architecture as present in compile.h
 166 UTS_MACHINE := $(ARCH)
 167
 168 # SHELL used by kbuild
 169 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 170           else if [ -x /bin/bash ]; then echo /bin/bash; \
 171           else echo sh; fi ; fi)
 172
 173 HOSTCC          = gcc
 174 HOSTCXX         = g++
 175 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 176 HOSTCXXFLAGS    = -O2
 177
 178 #       Decide whether to build built-in, modular, or both.
 179 #       Normally, just do built-in.
 180
 181 KBUILD_MODULES :=
 182 KBUILD_BUILTIN := 1
 183
 184 #       If we have only "make modules", don't compile built-in objects.
 185 #       When we're building modules with modversions, we need to consider
 186 #       the built-in objects during the descend as well, in order to
 187 #       make sure the checksums are uptodate before we record them.
 188
 189 ifeq ($(MAKECMDGOALS),modules)
 190   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 191 endif
 192
 193 #       If we have "make <whatever> modules", compile modules
 194 #       in addition to whatever we do anyway.
 195 #       Just "make" or "make all" shall build modules as well
 196
 197 ifneq ($(filter all modules,$(MAKECMDGOALS)),)
 198   KBUILD_MODULES := 1
 199 endif
 200
 201 ifeq ($(MAKECMDGOALS),)
 202   KBUILD_MODULES := 1
 203 endif
 204
 205 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
 206 export KBUILD_CHECKSRC KBUILD_SRC
 207
 208 # Beautify output
 209 # ---------------------------------------------------------------------------
 210 #
 211 # Normally, we echo the whole command before executing it. By making
 212 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 213 # $(quiet) to choose other forms of output instead, e.g.
 214 #
 215 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 216 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 217 #
 218 # If $(quiet) is empty, the whole command will be printed.
 219 # If it is set to "quiet_", only the short version will be printed.
 220 # If it is set to "silent_", nothing wil be printed at all, since
 221 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 222 #
 223 # A simple variant is to prefix commands with $(Q) - that's usefull
 224 # for commands that shall be hidden in non-verbose mode.
 225 #
 226 #       $(Q)ln $@ :<
 227 #
 228 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 229 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 230
 231 ifeq ($(KBUILD_VERBOSE),1)
 232   quiet =
 233   Q =
 234 else
 235   quiet=quiet_
 236   Q = @
 237 endif
 238
 239 # If the user is running make -s (silent mode), suppress echoing of
 240 # commands
 241
 242 ifneq ($(findstring s,$(MAKEFLAGS)),)
 243   quiet=silent_
 244 endif
 245
 246 check_gcc = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 247
 248 export quiet Q KBUILD_VERBOSE check_gcc
 249
 250 # Look for make include files relative to root of kernel src
 251 MAKEFLAGS += --include-dir=$(srctree)
 252
 253 # For maximum performance (+ possibly random breakage, uncomment
 254 # the following)
 255
 256 #MAKEFLAGS += -rR
 257
 258 # Make variables (CC, etc...)
 259
 260 AS              = $(CROSS_COMPILE)as
 261 LD              = $(CROSS_COMPILE)ld
 262 CC              = $(CROSS_COMPILE)gcc
 263 CPP             = $(CC) -E
 264 AR              = $(CROSS_COMPILE)ar
 265 NM              = $(CROSS_COMPILE)nm
 266 STRIP           = $(CROSS_COMPILE)strip
 267 OBJCOPY         = $(CROSS_COMPILE)objcopy
 268 OBJDUMP         = $(CROSS_COMPILE)objdump
 269 AWK             = awk
 270 RPM             := $(shell if [ -x "/usr/bin/rpmbuild" ]; then echo rpmbuild; \
 271                         else echo rpm; fi)
 272 GENKSYMS        = scripts/genksyms/genksyms
 273 DEPMOD          = /sbin/depmod
 274 KALLSYMS        = scripts/kallsyms
 275 PERL            = perl
 276 CHECK           = sparse
 277 MODFLAGS        = -DMODULE
 278 CFLAGS_MODULE   = $(MODFLAGS)
 279 AFLAGS_MODULE   = $(MODFLAGS)
 280 LDFLAGS_MODULE  = -r
 281 CFLAGS_KERNEL   =
 282 AFLAGS_KERNEL   =
 283
 284 NOSTDINC_FLAGS  = -nostdinc -iwithprefix include
 285
 286 CPPFLAGS        := -D__KERNEL__ -Iinclude \
 287                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
 288
 289 CFLAGS          := -Wall -Wstrict-prototypes -Wno-trigraphs \
 290                    -fno-strict-aliasing -fno-common
 291 AFLAGS          := -D__ASSEMBLY__
 292
 293 export  VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
 294         CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 295         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 296         HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB LDFLAGS_MODULE CHECK
 297
 298 export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFLAGS LDFLAGS
 299 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 300 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 301
 302 export MODVERDIR := .tmp_versions
 303
 304 # The temporary file to save gcc -MD generated dependencies must not
 305 # contain a comma
 306 comma := ,
 307 depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
 308
 309 # Files to ignore in find ... statements
 310
 311 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \) -prune -o
 312 RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS
 313
 314 # ===========================================================================
 315 # Rules shared between *config targets and build targets
 316
 317 # Basic helpers built in scripts/
 318 .PHONY: scripts_basic
 319 scripts_basic:
 320         $(Q)$(MAKE) $(build)=scripts/basic
 321
 322 # To make sure we do not include .config for any of the *config targets
 323 # catch them early, and hand them over to scripts/kconfig/Makefile
 324 # It is allowed to specify more targets when calling make, including
 325 # mixing *config targets and build targets.
 326 # For example 'make oldconfig all'.
 327 # Detect when mixed targets is specified, and make a second invocation
 328 # of make so .config is not included in this case either (for *config).
 329
 330 no-dot-config-targets := clean mrproper distclean \
 331                          cscope TAGS tags help %docs check%
 332
 333 config-targets := 0
 334 mixed-targets  := 0
 335 dot-config     := 1
 336
 337 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 338         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 339                 dot-config := 0
 340         endif
 341 endif
 342
 343 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 344         config-targets := 1
 345         ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 346                 mixed-targets := 1
 347         endif
 348 endif
 349
 350 ifeq ($(mixed-targets),1)
 351 # ===========================================================================
 352 # We're called with mixed targets (*config and build targets).
 353 # Handle them one by one.
 354
 355 %:: FORCE
 356         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 357
 358 else
 359 ifeq ($(config-targets),1)
 360 # ===========================================================================
 361 # *config targets only - make sure prerequisites are updated, and descend
 362 # in scripts/kconfig to make the *config target
 363
 364 config: scripts_basic FORCE
 365         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 366 %config: scripts_basic FORCE
 367         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 368
 369 else
 370 # ===========================================================================
 371 # Build targets only - this includes vmlinux, arch specific targets, clean
 372 # targets and others. In general all targets except *config targets.
 373
 374 # Additional helpers built in scripts/
 375 # Carefully list dependencies so we do not try to build scripts twice
 376 # in parrallel
 377 .PHONY: scripts
 378 scripts: scripts_basic include/config/MARKER
 379         $(Q)$(MAKE) $(build)=$(@)
 380
 381 scripts_basic: include/linux/autoconf.h
 382
 383
 384 # That's our default target when none is given on the command line
 385 # Note that 'modules' will be added as a prerequisite as well,
 386 # in the CONFIG_MODULES part below
 387
 388 all:    vmlinux
 389
 390 # Objects we will link into vmlinux / subdirs we need to visit
 391 init-y          := init/
 392 drivers-y       := drivers/ sound/
 393 net-y           := net/
 394 libs-y          := lib/
 395 core-y          := usr/
 396 SUBDIRS         :=
 397
 398 ifeq ($(dot-config),1)
 399 # In this section, we need .config
 400
 401 # Read in dependencies to all Kconfig* files, make sure to run
 402 # oldconfig if changes are detected.
 403 -include .config.cmd
 404
 405 include .config
 406
 407 # If .config needs to be updated, it will be done via the dependency
 408 # that autoconf has on .config.
 409 # To avoid any implicit rule to kick in, define an empty command
 410 .config: ;
 411
 412 # If .config is newer than include/linux/autoconf.h, someone tinkered
 413 # with it and forgot to run make oldconfig
 414 include/linux/autoconf.h: .config
 415         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 416 else
 417 # Dummy target needed, because used as prerequisite
 418 include/linux/autoconf.h: ;
 419 endif
 420
 421 include $(srctree)/arch/$(ARCH)/Makefile
 422
 423 # Let architecture Makefiles change CPPFLAGS if needed
 424 CFLAGS := $(CPPFLAGS) $(CFLAGS)
 425 AFLAGS := $(CPPFLAGS) $(AFLAGS)
 426
 427 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/
 428
 429 SUBDIRS         += $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 430                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 431                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 432
 433 ALL_SUBDIRS     := $(sort $(SUBDIRS) $(patsubst %/,%,$(filter %/, \
 434                      $(init-n) $(init-) \
 435                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 436                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 437
 438 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 439 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 440 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 441 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 442 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 443 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 444 libs-y          := $(libs-y1) $(libs-y2)
 445
 446 # Here goes the main Makefile
 447 # ---------------------------------------------------------------------------
 448
 449
 450 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 451 CFLAGS          += -Os
 452 else
 453 CFLAGS          += -O2
 454 endif
 455
 456 ifndef CONFIG_FRAME_POINTER
 457 CFLAGS          += -fomit-frame-pointer
 458 endif
 459
 460 ifdef CONFIG_DEBUG_INFO
 461 CFLAGS          += -g
 462 endif
 463
 464 # warn about C99 declaration after statement
 465 CFLAGS += $(call check_gcc,-Wdeclaration-after-statement,)
 466
 467 #
 468 # INSTALL_PATH specifies where to place the updated kernel and system map
 469 # images.  Uncomment if you want to place them anywhere other than root.
 470 #
 471
 472 #export INSTALL_PATH=/boot
 473
 474 #
 475 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 476 # relocations required by build roots.  This is not defined in the
 477 # makefile but the arguement can be passed to make if needed.
 478 #
 479
 480 MODLIB  := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 481 export MODLIB
 482
 483 # Build vmlinux
 484 # ---------------------------------------------------------------------------
 485
 486 #       This is a bit tricky: If we need to relink vmlinux, we want
 487 #       the version number incremented, which means recompile init/version.o
 488 #       and relink init/init.o. However, we cannot do this during the
 489 #       normal descending-into-subdirs phase, since at that time
 490 #       we cannot yet know if we will need to relink vmlinux.
 491 #       So we descend into init/ inside the rule for vmlinux again.
 492 head-y += $(HEAD)
 493 vmlinux-objs := $(head-y) $(init-y) $(core-y) $(libs-y) $(drivers-y) $(net-y)
 494
 495 quiet_cmd_vmlinux__ = LD      $@
 496 define cmd_vmlinux__
 497         $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) $(head-y) $(init-y) \
 498         --start-group \
 499         $(core-y) \
 500         $(libs-y) \
 501         $(drivers-y) \
 502         $(net-y) \
 503         --end-group \
 504         $(filter .tmp_kallsyms%,$^) \
 505         -o $@
 506 endef
 507
 508 #       set -e makes the rule exit immediately on error
 509
 510 define rule_vmlinux__
 511         +set -e;                                                        \
 512         $(if $(filter .tmp_kallsyms%,$^),,                              \
 513           echo '  GEN     .version';                                    \
 514           . $(srctree)/scripts/mkversion > .tmp_version;                \
 515           mv -f .tmp_version .version;                                  \
 516           $(MAKE) $(build)=init;                                        \
 517         )                                                               \
 518         $(if $($(quiet)cmd_vmlinux__),                                  \
 519           echo '  $($(quiet)cmd_vmlinux__)' &&)                         \
 520         $(cmd_vmlinux__);                                               \
 521         echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 522 endef
 523
 524 define rule_vmlinux
 525         $(rule_vmlinux__); \
 526         $(NM) $@ | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > System.map
 527 endef
 528
 529 LDFLAGS_vmlinux += -T arch/$(ARCH)/kernel/vmlinux.lds.s
 530
 531 #       Generate section listing all symbols and add it into vmlinux
 532 #       It's a three stage process:
 533 #       o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 534 #         empty
 535 #         Running kallsyms on that gives us .tmp_kallsyms1.o with
 536 #         the right size
 537 #       o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 538 #         but due to the added section, some addresses have shifted
 539 #         From here, we generate a correct .tmp_kallsyms2.o
 540 #       o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 541
 542 ifdef CONFIG_KALLSYMS
 543
 544 kallsyms.o := .tmp_kallsyms2.o
 545
 546 quiet_cmd_kallsyms = KSYM    $@
 547 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) > $@
 548
 549 .tmp_kallsyms1.o .tmp_kallsyms2.o: %.o: %.S scripts FORCE
 550         $(call if_changed_dep,as_o_S)
 551
 552 .tmp_kallsyms%.S: .tmp_vmlinux%
 553         $(call cmd,kallsyms)
 554
 555 .tmp_vmlinux1: $(vmlinux-objs) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 556         +$(call if_changed_rule,vmlinux__)
 557
 558 .tmp_vmlinux2: $(vmlinux-objs) .tmp_kallsyms1.o arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 559         $(call if_changed_rule,vmlinux__)
 560
 561 endif
 562
 563 #       Finally the vmlinux rule
 564
 565 vmlinux: $(vmlinux-objs) $(kallsyms.o) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 566         $(call if_changed_rule,vmlinux)
 567
 568 #       The actual objects are generated when descending,
 569 #       make sure no implicit rule kicks in
 570
 571 $(sort $(vmlinux-objs)) arch/$(ARCH)/kernel/vmlinux.lds.s: $(SUBDIRS) ;
 572
 573 #       Handle descending into subdirectories listed in $(SUBDIRS)
 574
 575 .PHONY: $(SUBDIRS)
 576 $(SUBDIRS): prepare-all scripts
 577         $(Q)$(MAKE) $(build)=$@
 578
 579 # Things we need to do before we recursively start building the kernel
 580 # or the modules are listed in "prepare-all".
 581 # A multi level approach is used. prepare1 is updated first, then prepare0.
 582 # prepare-all is the collection point for the prepare targets.
 583
 584 .PHONY: prepare-all prepare prepare0 prepare1
 585
 586 # prepare1 is used to check if we are building in a separate output directory,
 587 # and if so do:
 588 # 1) Check that make has not been executed in the kernel src $(srctree)
 589 # 2) Create the include2 directory, used for the second asm symlink
 590
 591 prepare1:
 592 ifneq ($(KBUILD_SRC),)
 593         @echo '  Using $(srctree) as source for kernel'
 594         $(Q)if [ -h $(srctree)/include/asm -o -f $(srctree)/.config ]; then \
 595                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 596                 echo "  in the '$(srctree)' directory.";\
 597                 /bin/false; \
 598         fi;
 599         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 600         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 601 endif
 602
 603 prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
 604 ifdef KBUILD_MODULES
 605 ifeq ($(origin SUBDIRS),file)
 606         $(Q)rm -rf $(MODVERDIR)
 607 else
 608         @echo '*** Warning: Overriding SUBDIRS on the command line can cause'
 609         @echo '***          inconsistencies'
 610 endif
 611 endif
 612         $(if $(CONFIG_MODULES),$(Q)mkdir -p $(MODVERDIR))
 613
 614 # All the preparing..
 615 prepare-all: prepare0 prepare
 616
 617 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 618 #       done in arch/$(ARCH)/kernel/Makefile
 619
 620 export AFLAGS_vmlinux.lds.o += -P -C -U$(ARCH)
 621
 622 # Single targets
 623 # ---------------------------------------------------------------------------
 624
 625 %.s: %.c scripts FORCE
 626         $(Q)$(MAKE) $(build)=$(@D) $@
 627 %.i: %.c scripts FORCE
 628         $(Q)$(MAKE) $(build)=$(@D) $@
 629 %.o: %.c scripts FORCE
 630         $(Q)$(MAKE) $(build)=$(@D) $@
 631 %/:      scripts prepare FORCE
 632         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
 633 %.lst: %.c scripts FORCE
 634         $(Q)$(MAKE) $(build)=$(@D) $@
 635 %.s: %.S scripts FORCE
 636         $(Q)$(MAKE) $(build)=$(@D) $@
 637 %.o: %.S scripts FORCE
 638         $(Q)$(MAKE) $(build)=$(@D) $@
 639
 640 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 641 #       hard to detect, but I suppose "make mrproper" is a good idea
 642 #       before switching between archs anyway.
 643
 644 include/asm:
 645         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 646         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 647         @ln -fsn asm-$(ARCH) $@
 648
 649 #       Split autoconf.h into include/linux/config/*
 650
 651 include/config/MARKER: include/linux/autoconf.h
 652         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 653         @scripts/basic/split-include include/linux/autoconf.h include/config
 654         @touch $@
 655
 656 # Generate some files
 657 # ---------------------------------------------------------------------------
 658
 659 #       version.h changes when $(KERNELRELEASE) etc change, as defined in
 660 #       this Makefile
 661
 662 uts_len := 64
 663
 664 define filechk_version.h
 665         if ((`echo -n "$(KERNELRELEASE)" | wc -c ` > $(uts_len))); then \
 666           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 667           exit 1; \
 668         fi; \
 669         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 670           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 671          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 672         )
 673 endef
 674
 675 include/linux/version.h: Makefile
 676         $(call filechk,version.h)
 677
 678 # ---------------------------------------------------------------------------
 679
 680 .PHONY: depend dep
 681 depend dep:
 682         @echo '*** Warning: make $@ is unnecessary now.'
 683
 684 # ---------------------------------------------------------------------------
 685 # Modules
 686
 687 ifdef CONFIG_MODULES
 688
 689 #       By default, build modules as well
 690
 691 all: modules
 692
 693 #       Build modules
 694
 695 .PHONY: modules
 696 modules: $(SUBDIRS) $(if $(KBUILD_BUILTIN),vmlinux)
 697         @echo '  Building modules, stage 2.';
 698         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 699
 700 #       Install modules
 701
 702 .PHONY: modules_install
 703 modules_install: _modinst_ _modinst_post
 704
 705 .PHONY: _modinst_
 706 _modinst_:
 707         @if [ -z "`$(DEPMOD) -V | grep module-init-tools`" ]; then \
 708                 echo "Warning: you may need to install module-init-tools"; \
 709                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 710                 sleep 1; \
 711         fi
 712         @rm -rf $(MODLIB)/kernel
 713         @rm -f $(MODLIB)/build
 714         @mkdir -p $(MODLIB)/kernel
 715         @ln -s $(TOPDIR) $(MODLIB)/build
 716         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 717
 718 # If System.map exists, run depmod.  This deliberately does not have a
 719 # dependency on System.map since that would run the dependency tree on
 720 # vmlinux.  This depmod is only for convenience to give the initial
 721 # boot a modules.dep even before / is mounted read-write.  However the
 722 # boot script depmod is the master version.
 723 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 724 depmod_opts     :=
 725 else
 726 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 727 endif
 728 .PHONY: _modinst_post
 729 _modinst_post: _modinst_
 730         if [ -r System.map ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 731
 732 else # CONFIG_MODULES
 733
 734 # Modules not configured
 735 # ---------------------------------------------------------------------------
 736
 737 modules modules_install: FORCE
 738         @echo
 739         @echo "The present kernel configuration has modules disabled."
 740         @echo "Type 'make config' and enable loadable module support."
 741         @echo "Then build a kernel with module support enabled."
 742         @echo
 743         @exit 1
 744
 745 endif # CONFIG_MODULES
 746
 747 # Generate asm-offsets.h
 748 # ---------------------------------------------------------------------------
 749
 750 define filechk_gen-asm-offsets
 751         (set -e; \
 752          echo "#ifndef __ASM_OFFSETS_H__"; \
 753          echo "#define __ASM_OFFSETS_H__"; \
 754          echo "/*"; \
 755          echo " * DO NOT MODIFY."; \
 756          echo " *"; \
 757          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 758          echo " *"; \
 759          echo " */"; \
 760          echo ""; \
 761          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 762          echo ""; \
 763          echo "#endif" )
 764 endef
 765
 766
 767 ###
 768 # Cleaning is done on three levels.
 769 # make clean     Delete all automatically generated files, including
 770 #                tools and firmware.
 771 # make mrproper  Delete the current configuration, and related files
 772 #                Any core files spread around are deleted as well
 773 # make distclean Remove editor backup files, patch leftover files and the like
 774
 775 # Directories & files removed with 'make clean'
 776 CLEAN_DIRS  += $(MODVERDIR) include/config include2
 777 CLEAN_FILES +=  vmlinux System.map \
 778                 include/linux/autoconf.h include/linux/version.h \
 779                 include/asm include/linux/modversions.h \
 780                 kernel.spec .tmp*
 781
 782 # Files removed with 'make mrproper'
 783 MRPROPER_FILES += .version .config .config.old tags TAGS cscope*
 784
 785 # clean - Delete all intermediate files
 786 #
 787 clean-dirs += $(addprefix _clean_,$(ALL_SUBDIRS) Documentation/DocBook scripts)
 788 .PHONY: $(clean-dirs) clean archclean mrproper archmrproper distclean
 789 $(clean-dirs):
 790         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 791
 792 clean:          rm-dirs  := $(wildcard $(CLEAN_DIRS))
 793 mrproper:       rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 794 quiet_cmd_rmdirs = $(if $(rm-dirs),CLEAN   $(rm-dirs))
 795       cmd_rmdirs = rm -rf $(rm-dirs)
 796
 797 clean:          rm-files := $(wildcard $(CLEAN_FILES))
 798 mrproper:       rm-files := $(wildcard $(MRPROPER_FILES))
 799 quiet_cmd_rmfiles = $(if $(rm-files),CLEAN   $(rm-files))
 800       cmd_rmfiles = rm -rf $(rm-files)
 801
 802 clean: archclean $(clean-dirs)
 803         $(call cmd,rmdirs)
 804         $(call cmd,rmfiles)
 805         @find . $(RCS_FIND_IGNORE) \
 806                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 807                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 808                 -type f -print | xargs rm -f
 809
 810 # mrproper
 811 #
 812 distclean: mrproper
 813 mrproper: clean archmrproper
 814         $(call cmd,rmdirs)
 815         $(call cmd,rmfiles)
 816         @find . $(RCS_FIND_IGNORE) \
 817                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 818                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 819                 -o -name '.*.rej' -o -size 0 \
 820                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
 821                 -type f -print | xargs rm -f
 822
 823 # Generate tags for editors
 824 # ---------------------------------------------------------------------------
 825
 826 define all-sources
 827         ( find . $(RCS_FIND_IGNORE) \
 828                \( -name include -o -name arch \) -prune -o \
 829                -name '*.[chS]' -print; \
 830           find arch/$(ARCH) $(RCS_FIND_IGNORE) \
 831                -name '*.[chS]' -print; \
 832           find include $(RCS_FIND_IGNORE) \
 833                \( -name config -o -name 'asm-*' \) -prune \
 834                -o -name '*.[chS]' -print; \
 835           find include/asm-$(ARCH) $(RCS_FIND_IGNORE) \
 836                -name '*.[chS]' -print; \
 837           find include/asm-generic $(RCS_FIND_IGNORE) \
 838                -name '*.[chS]' -print )
 839 endef
 840
 841 quiet_cmd_cscope-file = FILELST cscope.files
 842       cmd_cscope-file = $(all-sources) > cscope.files
 843
 844 quiet_cmd_cscope = MAKE    cscope.out
 845       cmd_cscope = cscope -k -b -q
 846
 847 cscope: FORCE
 848         $(call cmd,cscope-file)
 849         $(call cmd,cscope)
 850
 851 quiet_cmd_TAGS = MAKE   $@
 852 cmd_TAGS = $(all-sources) | etags -
 853
 854 #       Exuberant ctags works better with -I
 855
 856 quiet_cmd_tags = MAKE   $@
 857 define cmd_tags
 858         rm -f $@; \
 859         CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
 860         $(all-sources) | xargs ctags $$CTAGSF -a
 861 endef
 862
 863 TAGS: FORCE
 864         $(call cmd,TAGS)
 865
 866 tags: FORCE
 867         $(call cmd,tags)
 868
 869 # RPM target
 870 # ---------------------------------------------------------------------------
 871
 872 .PHONY: rpm
 873
 874 # Remove hyphens since they have special meaning in RPM filenames
 875 KERNELPATH=kernel-$(subst -,,$(KERNELRELEASE))
 876
 877 #       If you do a make spec before packing the tarball you can rpm -ta it
 878
 879 spec:
 880         $(CONFIG_SHELL) $(srctree)/scripts/mkspec > $(objtree)/kernel.spec
 881
 882 #       a) Build a tar ball
 883 #       b) generate an rpm from it
 884 #       c) and pack the result
 885 #       - Use /. to avoid tar packing just the symlink
 886
 887 rpm:    clean spec
 888         set -e; \
 889         cd .. ; \
 890         ln -sf $(srctree) $(KERNELPATH) ; \
 891         tar -cvz $(RCS_TAR_IGNORE) -f $(KERNELPATH).tar.gz $(KERNELPATH)/. ; \
 892         rm $(KERNELPATH)
 893
 894         set -e; \
 895         $(CONFIG_SHELL) $(srctree)/scripts/mkversion > $(objtree)/.tmp_version;\
 896         mv -f $(objtree)/.tmp_version $(objtree)/.version;
 897
 898         $(RPM) --target $(UTS_MACHINE) -ta ../$(KERNELPATH).tar.gz
 899         rm ../$(KERNELPATH).tar.gz
 900
 901 # Brief documentation of the typical targets used
 902 # ---------------------------------------------------------------------------
 903
 904 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
 905 boards := $(notdir $(boards))
 906
 907 help:
 908         @echo  'Cleaning targets:'
 909         @echo  '  clean           - remove most generated files but keep the config'
 910         @echo  '  mrproper        - remove all generated files + config + various backup files'
 911         @echo  ''
 912         @echo  'Configuration targets:'
 913         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
 914         @echo  ''
 915         @echo  'Other generic targets:'
 916         @echo  '  all             - Build all targets marked with [*]'
 917         @echo  '* vmlinux         - Build the bare kernel'
 918         @echo  '* modules         - Build all modules'
 919         @echo  '  modules_install - Install all modules'
 920         @echo  '  dir/            - Build all files in dir and below'
 921         @echo  '  dir/file.[ois]  - Build specified target only'
 922         @echo  '  rpm             - Build a kernel as an RPM package'
 923         @echo  '  tags/TAGS       - Generate tags file for editors'
 924         @echo  '  cscope          - Generate cscope index'
 925         @echo  ''
 926         @echo  'Documentation targets:'
 927         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
 928         @echo  ''
 929         @echo  'Architecture specific targets ($(ARCH)):'
 930         @$(if $(archhelp),$(archhelp),\
 931                 echo '  No architecture specific help defined for $(ARCH)')
 932         @echo  ''
 933         @$(if $(boards), \
 934                 $(foreach b, $(boards), \
 935                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
 936                 echo '')
 937
 938         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
 939         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
 940         @echo  '  make C=1   [targets] Check all c source with checker tool'
 941         @echo  ''
 942         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
 943         @echo  'For further info see the ./README file'
 944
 945
 946 # Documentation targets
 947 # ---------------------------------------------------------------------------
 948 %docs: scripts FORCE
 949         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
 950
 951 # Scripts to check various things for consistency
 952 # ---------------------------------------------------------------------------
 953
 954 configcheck:
 955         find * $(RCS_FIND_IGNORE) \
 956                 -name '*.[hcS]' -type f -print | sort \
 957                 | xargs $(PERL) -w scripts/checkconfig.pl
 958
 959 includecheck:
 960         find * $(RCS_FIND_IGNORE) \
 961                 -name '*.[hcS]' -type f -print | sort \
 962                 | xargs $(PERL) -w scripts/checkincludes.pl
 963
 964 versioncheck:
 965         find * $(RCS_FIND_IGNORE) \
 966                 -name '*.[hcS]' -type f -print | sort \
 967                 | xargs $(PERL) -w scripts/checkversion.pl
 968
 969 endif #ifeq ($(config-targets),1)
 970 endif #ifeq ($(mixed-targets),1)
 971
 972 # FIXME Should go into a make.lib or something
 973 # ===========================================================================
 974
 975 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
 976           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
 977           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
 978
 979 quiet_cmd_as_o_S = AS      $@
 980 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
 981
 982 # read all saved command lines
 983
 984 targets := $(wildcard $(sort $(targets)))
 985 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 986
 987 ifneq ($(cmd_files),)
 988   $(cmd_files): ;       # Do not try to update included dependency files
 989   include $(cmd_files)
 990 endif
 991
 992 # execute the command and also postprocess generated .d dependencies
 993 # file
 994
 995 if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
 996                           $(filter-out $(cmd_$(1)),$(cmd_$@))\
 997                           $(filter-out $(cmd_$@),$(cmd_$(1)))),\
 998         @set -e; \
 999         $(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1000         $(cmd_$(1)); \
1001         scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
1002         rm -f $(depfile); \
1003         mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
1004
1005 # Usage: $(call if_changed_rule,foo)
1006 # will check if $(cmd_foo) changed, or any of the prequisites changed,
1007 # and if so will execute $(rule_foo)
1008
1009 if_changed_rule = $(if $(strip $? \
1010                                $(filter-out $(cmd_$(1)),$(cmd_$(@F)))\
1011                                $(filter-out $(cmd_$(@F)),$(cmd_$(1)))),\
1012                        @$(rule_$(1)))
1013
1014 # If quiet is set, only print short version of command
1015
1016 cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
1017
1018 # filechk is used to check if the content of a generated file is updated.
1019 # Sample usage:
1020 # define filechk_sample
1021 #       echo $KERNELRELEASE
1022 # endef
1023 # version.h : Makefile
1024 #       $(call filechk,sample)
1025 # The rule defined shall write to stdout the content of the new file.
1026 # The existing file will be compared with the new one.
1027 # - If no file exist it is created
1028 # - If the content differ the new file is used
1029 # - If they are equal no change, and no timestamp update
1030
1031 define filechk
1032         @set -e;                                \
1033         echo '  CHK     $@';                    \
1034         mkdir -p $(dir $@);                     \
1035         $(filechk_$(1)) < $< > $@.tmp;          \
1036         if [ -r $@ ] && cmp -s $@ $@.tmp; then  \
1037                 rm -f $@.tmp;                   \
1038         else                                    \
1039                 echo '  UPD     $@';            \
1040                 mv -f $@.tmp $@;                \
1041         fi
1042 endef
1043
1044 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1045 # Usage:
1046 # $(Q)$(MAKE) $(build)=dir
1047 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
1048
1049 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1050 # Usage:
1051 # $(Q)$(MAKE) $(clean)=dir
1052 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1053
1054 #       $(call descend,<dir>,<target>)
1055 #       Recursively call a sub-make in <dir> with target <target>
1056 # Usage is deprecated, because make does not see this as an invocation of make.
1057 descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
1058
1059 endif   # skip-makefile
1060
1061 FORCE: