Makefile

   1 VERSION = 3
   2 PATCHLEVEL = 14
   3 SUBLEVEL = 20
   4 EXTRAVERSION =
   5 NAME = Remembering Coco
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # Do not:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoids hard-to-debug behaviour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # Avoid funny character set dependencies
  20 unexport LC_ALL
  21 LC_COLLATE=C
  22 LC_NUMERIC=C
  23 export LC_COLLATE LC_NUMERIC
  24
  25 # Avoid interference with shell env settings
  26 unexport GREP_OPTIONS
  27
  28 # We are using a recursive build, so we need to do a little thinking
  29 # to get the ordering right.
  30 #
  31 # Most importantly: sub-Makefiles should only ever modify files in
  32 # their own directory. If in some directory we have a dependency on
  33 # a file in another dir (which doesn't happen often, but it's often
  34 # unavoidable when linking the built-in.o targets which finally
  35 # turn into vmlinux), we will call a sub make in that other dir, and
  36 # after that we are sure that everything which is in that other dir
  37 # is now up to date.
  38 #
  39 # The only cases where we need to modify files which have global
  40 # effects are thus separated out and done before the recursive
  41 # descending is started. They are now explicitly listed as the
  42 # prepare rule.
  43
  44 # To put more focus on warnings, be less verbose as default
  45 # Use 'make V=1' to see the full commands
  46
  47 ifeq ("$(origin V)", "command line")
  48   KBUILD_VERBOSE = $(V)
  49 endif
  50 ifndef KBUILD_VERBOSE
  51   KBUILD_VERBOSE = 0
  52 endif
  53
  54 # Call a source code checker (by default, "sparse") as part of the
  55 # C compilation.
  56 #
  57 # Use 'make C=1' to enable checking of only re-compiled files.
  58 # Use 'make C=2' to enable checking of *all* source files, regardless
  59 # of whether they are re-compiled or not.
  60 #
  61 # See the file "Documentation/sparse.txt" for more details, including
  62 # where to get the "sparse" utility.
  63
  64 ifeq ("$(origin C)", "command line")
  65   KBUILD_CHECKSRC = $(C)
  66 endif
  67 ifndef KBUILD_CHECKSRC
  68   KBUILD_CHECKSRC = 0
  69 endif
  70
  71 # Use make M=dir to specify directory of external module to build
  72 # Old syntax make ... SUBDIRS=$PWD is still supported
  73 # Setting the environment variable KBUILD_EXTMOD take precedence
  74 ifdef SUBDIRS
  75   KBUILD_EXTMOD ?= $(SUBDIRS)
  76 endif
  77
  78 ifeq ("$(origin M)", "command line")
  79   KBUILD_EXTMOD := $(M)
  80 endif
  81
  82 # kbuild supports saving output files in a separate directory.
  83 # To locate output files in a separate directory two syntaxes are supported.
  84 # In both cases the working directory must be the root of the kernel src.
  85 # 1) O=
  86 # Use "make O=dir/to/store/output/files/"
  87 #
  88 # 2) Set KBUILD_OUTPUT
  89 # Set the environment variable KBUILD_OUTPUT to point to the directory
  90 # where the output files shall be placed.
  91 # export KBUILD_OUTPUT=dir/to/store/output/files/
  92 # make
  93 #
  94 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  95 # variable.
  96
  97
  98 # KBUILD_SRC is set on invocation of make in OBJ directory
  99 # KBUILD_SRC is not intended to be used by the regular user (for now)
 100 ifeq ($(KBUILD_SRC),)
 101
 102 # OK, Make called in directory where kernel src resides
 103 # Do we want to locate output files in a separate directory?
 104 ifeq ("$(origin O)", "command line")
 105   KBUILD_OUTPUT := $(O)
 106 endif
 107
 108 ifeq ("$(origin W)", "command line")
 109   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 110 endif
 111
 112 # That's our default target when none is given on the command line
 113 PHONY := _all
 114 _all:
 115
 116 # Cancel implicit rules on top Makefile
 117 $(CURDIR)/Makefile Makefile: ;
 118
 119 ifneq ($(KBUILD_OUTPUT),)
 120 # Invoke a second make in the output directory, passing relevant variables
 121 # check that the output directory actually exists
 122 saved-output := $(KBUILD_OUTPUT)
 123 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 124 $(if $(KBUILD_OUTPUT),, \
 125      $(error output directory "$(saved-output)" does not exist))
 126
 127 PHONY += $(MAKECMDGOALS) sub-make
 128
 129 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 130         @:
 131
 132 sub-make: FORCE
 133         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 134         KBUILD_SRC=$(CURDIR) \
 135         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 136         $(filter-out _all sub-make,$(MAKECMDGOALS))
 137
 138 # Leave processing to above invocation of make
 139 skip-makefile := 1
 140 endif # ifneq ($(KBUILD_OUTPUT),)
 141 endif # ifeq ($(KBUILD_SRC),)
 142
 143 # We process the rest of the Makefile if this is the final invocation of make
 144 ifeq ($(skip-makefile),)
 145
 146 # If building an external module we do not care about the all: rule
 147 # but instead _all depend on modules
 148 PHONY += all
 149 ifeq ($(KBUILD_EXTMOD),)
 150 _all: all
 151 else
 152 _all: modules
 153 endif
 154
 155 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 156 objtree         := $(CURDIR)
 157 src             := $(srctree)
 158 obj             := $(objtree)
 159
 160 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 161
 162 export srctree objtree VPATH
 163
 164
 165 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 166 # first, and if a usermode build is happening, the "ARCH=um" on the command
 167 # line overrides the setting of ARCH below.  If a native build is happening,
 168 # then ARCH is assigned, getting whatever value it gets normally, and
 169 # SUBARCH is subsequently ignored.
 170
 171 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 172                                   -e s/sun4u/sparc64/ \
 173                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 174                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 175                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 176                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 177
 178 # Cross compiling and selecting different set of gcc/bin-utils
 179 # ---------------------------------------------------------------------------
 180 #
 181 # When performing cross compilation for other architectures ARCH shall be set
 182 # to the target architecture. (See arch/* for the possibilities).
 183 # ARCH can be set during invocation of make:
 184 # make ARCH=ia64
 185 # Another way is to have ARCH set in the environment.
 186 # The default ARCH is the host where make is executed.
 187
 188 # CROSS_COMPILE specify the prefix used for all executables used
 189 # during compilation. Only gcc and related bin-utils executables
 190 # are prefixed with $(CROSS_COMPILE).
 191 # CROSS_COMPILE can be set on the command line
 192 # make CROSS_COMPILE=ia64-linux-
 193 # Alternatively CROSS_COMPILE can be set in the environment.
 194 # A third alternative is to store a setting in .config so that plain
 195 # "make" in the configured kernel build directory always uses that.
 196 # Default value for CROSS_COMPILE is not to prefix executables
 197 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 198 ARCH            ?= $(SUBARCH)
 199 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 200
 201 # Architecture as present in compile.h
 202 UTS_MACHINE     := $(ARCH)
 203 SRCARCH         := $(ARCH)
 204
 205 # Additional ARCH settings for x86
 206 ifeq ($(ARCH),i386)
 207         SRCARCH := x86
 208 endif
 209 ifeq ($(ARCH),x86_64)
 210         SRCARCH := x86
 211 endif
 212
 213 # Additional ARCH settings for sparc
 214 ifeq ($(ARCH),sparc32)
 215        SRCARCH := sparc
 216 endif
 217 ifeq ($(ARCH),sparc64)
 218        SRCARCH := sparc
 219 endif
 220
 221 # Additional ARCH settings for sh
 222 ifeq ($(ARCH),sh64)
 223        SRCARCH := sh
 224 endif
 225
 226 # Additional ARCH settings for tile
 227 ifeq ($(ARCH),tilepro)
 228        SRCARCH := tile
 229 endif
 230 ifeq ($(ARCH),tilegx)
 231        SRCARCH := tile
 232 endif
 233
 234 # Where to locate arch specific headers
 235 hdr-arch  := $(SRCARCH)
 236
 237 KCONFIG_CONFIG  ?= .config
 238 export KCONFIG_CONFIG
 239
 240 # SHELL used by kbuild
 241 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 242           else if [ -x /bin/bash ]; then echo /bin/bash; \
 243           else echo sh; fi ; fi)
 244
 245 HOSTCC       = gcc
 246 HOSTCXX      = g++
 247 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 248 HOSTCXXFLAGS = -O2
 249
 250 # Decide whether to build built-in, modular, or both.
 251 # Normally, just do built-in.
 252
 253 KBUILD_MODULES :=
 254 KBUILD_BUILTIN := 1
 255
 256 #       If we have only "make modules", don't compile built-in objects.
 257 #       When we're building modules with modversions, we need to consider
 258 #       the built-in objects during the descend as well, in order to
 259 #       make sure the checksums are up to date before we record them.
 260
 261 ifeq ($(MAKECMDGOALS),modules)
 262   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 263 endif
 264
 265 #       If we have "make <whatever> modules", compile modules
 266 #       in addition to whatever we do anyway.
 267 #       Just "make" or "make all" shall build modules as well
 268
 269 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 270   KBUILD_MODULES := 1
 271 endif
 272
 273 ifeq ($(MAKECMDGOALS),)
 274   KBUILD_MODULES := 1
 275 endif
 276
 277 export KBUILD_MODULES KBUILD_BUILTIN
 278 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 279
 280 # Beautify output
 281 # ---------------------------------------------------------------------------
 282 #
 283 # Normally, we echo the whole command before executing it. By making
 284 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 285 # $(quiet) to choose other forms of output instead, e.g.
 286 #
 287 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 288 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 289 #
 290 # If $(quiet) is empty, the whole command will be printed.
 291 # If it is set to "quiet_", only the short version will be printed.
 292 # If it is set to "silent_", nothing will be printed at all, since
 293 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 294 #
 295 # A simple variant is to prefix commands with $(Q) - that's useful
 296 # for commands that shall be hidden in non-verbose mode.
 297 #
 298 #       $(Q)ln $@ :<
 299 #
 300 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 301 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 302
 303 ifeq ($(KBUILD_VERBOSE),1)
 304   quiet =
 305   Q =
 306 else
 307   quiet=quiet_
 308   Q = @
 309 endif
 310
 311 # If the user is running make -s (silent mode), suppress echoing of
 312 # commands
 313
 314 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
 315 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
 316   quiet=silent_
 317 endif
 318 else                                    # make-3.8x
 319 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 320   quiet=silent_
 321 endif
 322 endif
 323
 324 export quiet Q KBUILD_VERBOSE
 325
 326
 327 # Look for make include files relative to root of kernel src
 328 MAKEFLAGS += --include-dir=$(srctree)
 329
 330 # We need some generic definitions (do not try to remake the file).
 331 $(srctree)/scripts/Kbuild.include: ;
 332 include $(srctree)/scripts/Kbuild.include
 333
 334 # Make variables (CC, etc...)
 335
 336 AS              = $(CROSS_COMPILE)as
 337 LD              = $(CROSS_COMPILE)ld
 338 CC              = $(CROSS_COMPILE)gcc
 339 CPP             = $(CC) -E
 340 AR              = $(CROSS_COMPILE)ar
 341 NM              = $(CROSS_COMPILE)nm
 342 STRIP           = $(CROSS_COMPILE)strip
 343 OBJCOPY         = $(CROSS_COMPILE)objcopy
 344 OBJDUMP         = $(CROSS_COMPILE)objdump
 345 AWK             = awk
 346 GENKSYMS        = scripts/genksyms/genksyms
 347 INSTALLKERNEL  := installkernel
 348 DEPMOD          = /sbin/depmod
 349 PERL            = perl
 350 CHECK           = sparse
 351
 352 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 353                   -Wbitwise -Wno-return-void $(CF)
 354 CFLAGS_MODULE   =
 355 AFLAGS_MODULE   =
 356 LDFLAGS_MODULE  =
 357 CFLAGS_KERNEL   =
 358 AFLAGS_KERNEL   =
 359 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 360
 361
 362 # Use USERINCLUDE when you must reference the UAPI directories only.
 363 USERINCLUDE    := \
 364                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 365                 -Iarch/$(hdr-arch)/include/generated/uapi \
 366                 -I$(srctree)/include/uapi \
 367                 -Iinclude/generated/uapi \
 368                 -include $(srctree)/include/linux/kconfig.h
 369
 370 # Use LINUXINCLUDE when you must reference the include/ directory.
 371 # Needed to be compatible with the O= option
 372 LINUXINCLUDE    := \
 373                 -I$(srctree)/arch/$(hdr-arch)/include \
 374                 -Iarch/$(hdr-arch)/include/generated \
 375                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 376                 -Iinclude \
 377                 $(USERINCLUDE)
 378
 379 KBUILD_CPPFLAGS := -D__KERNEL__
 380
 381 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 382                    -fno-strict-aliasing -fno-common \
 383                    -Werror-implicit-function-declaration \
 384                    -Wno-format-security \
 385                    -fno-delete-null-pointer-checks
 386 KBUILD_AFLAGS_KERNEL :=
 387 KBUILD_CFLAGS_KERNEL :=
 388 KBUILD_AFLAGS   := -D__ASSEMBLY__
 389 KBUILD_AFLAGS_MODULE  := -DMODULE
 390 KBUILD_CFLAGS_MODULE  := -DMODULE
 391 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 392
 393 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 394 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 395 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 396
 397 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 398 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 399 export CPP AR NM STRIP OBJCOPY OBJDUMP
 400 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 401 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 402
 403 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 404 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 405 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 406 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 407 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 408 export KBUILD_ARFLAGS
 409
 410 # When compiling out-of-tree modules, put MODVERDIR in the module
 411 # tree rather than in the kernel tree. The kernel tree might
 412 # even be read-only.
 413 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 414
 415 # Files to ignore in find ... statements
 416
 417 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
 418                    -o -name .pc -o -name .hg -o -name .git \) -prune -o
 419 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 420                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 421
 422 # ===========================================================================
 423 # Rules shared between *config targets and build targets
 424
 425 # Basic helpers built in scripts/
 426 PHONY += scripts_basic
 427 scripts_basic:
 428         $(Q)$(MAKE) $(build)=scripts/basic
 429         $(Q)rm -f .tmp_quiet_recordmcount
 430
 431 # To avoid any implicit rule to kick in, define an empty command.
 432 scripts/basic/%: scripts_basic ;
 433
 434 PHONY += outputmakefile
 435 # outputmakefile generates a Makefile in the output directory, if using a
 436 # separate output directory. This allows convenient use of make in the
 437 # output directory.
 438 outputmakefile:
 439 ifneq ($(KBUILD_SRC),)
 440         $(Q)ln -fsn $(srctree) source
 441         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 442             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 443 endif
 444
 445 # Support for using generic headers in asm-generic
 446 PHONY += asm-generic
 447 asm-generic:
 448         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 449                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 450         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 451                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 452
 453 # To make sure we do not include .config for any of the *config targets
 454 # catch them early, and hand them over to scripts/kconfig/Makefile
 455 # It is allowed to specify more targets when calling make, including
 456 # mixing *config targets and build targets.
 457 # For example 'make oldconfig all'.
 458 # Detect when mixed targets is specified, and make a second invocation
 459 # of make so .config is not included in this case either (for *config).
 460
 461 version_h := include/generated/uapi/linux/version.h
 462
 463 no-dot-config-targets := clean mrproper distclean \
 464                          cscope gtags TAGS tags help %docs check% coccicheck \
 465                          $(version_h) headers_% archheaders archscripts \
 466                          kernelversion %src-pkg
 467
 468 config-targets := 0
 469 mixed-targets  := 0
 470 dot-config     := 1
 471
 472 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 473         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 474                 dot-config := 0
 475         endif
 476 endif
 477
 478 ifeq ($(KBUILD_EXTMOD),)
 479         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 480                 config-targets := 1
 481                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 482                         mixed-targets := 1
 483                 endif
 484         endif
 485 endif
 486
 487 ifeq ($(mixed-targets),1)
 488 # ===========================================================================
 489 # We're called with mixed targets (*config and build targets).
 490 # Handle them one by one.
 491
 492 %:: FORCE
 493         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 494
 495 else
 496 ifeq ($(config-targets),1)
 497 # ===========================================================================
 498 # *config targets only - make sure prerequisites are updated, and descend
 499 # in scripts/kconfig to make the *config target
 500
 501 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 502 # KBUILD_DEFCONFIG may point out an alternative default configuration
 503 # used for 'make defconfig'
 504 include $(srctree)/arch/$(SRCARCH)/Makefile
 505 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 506
 507 config: scripts_basic outputmakefile FORCE
 508         $(Q)mkdir -p include/linux include/config
 509         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 510
 511 %config: scripts_basic outputmakefile FORCE
 512         $(Q)mkdir -p include/linux include/config
 513         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 514
 515 else
 516 # ===========================================================================
 517 # Build targets only - this includes vmlinux, arch specific targets, clean
 518 # targets and others. In general all targets except *config targets.
 519
 520 ifeq ($(KBUILD_EXTMOD),)
 521 # Additional helpers built in scripts/
 522 # Carefully list dependencies so we do not try to build scripts twice
 523 # in parallel
 524 PHONY += scripts
 525 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 526          asm-generic
 527         $(Q)$(MAKE) $(build)=$(@)
 528
 529 # Objects we will link into vmlinux / subdirs we need to visit
 530 init-y          := init/
 531 drivers-y       := drivers/ sound/ firmware/
 532 net-y           := net/
 533 libs-y          := lib/
 534 core-y          := usr/
 535 endif # KBUILD_EXTMOD
 536
 537 ifeq ($(dot-config),1)
 538 # Read in config
 539 -include include/config/auto.conf
 540
 541 ifeq ($(KBUILD_EXTMOD),)
 542 # Read in dependencies to all Kconfig* files, make sure to run
 543 # oldconfig if changes are detected.
 544 -include include/config/auto.conf.cmd
 545
 546 # To avoid any implicit rule to kick in, define an empty command
 547 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 548
 549 # If .config is newer than include/config/auto.conf, someone tinkered
 550 # with it and forgot to run make oldconfig.
 551 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 552 # we execute the config step to be sure to catch updated Kconfig files
 553 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 554         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 555 else
 556 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 557 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 558 PHONY += include/config/auto.conf
 559
 560 include/config/auto.conf:
 561         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 562         echo >&2;                                                       \
 563         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 564         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 565         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 566         echo >&2 ;                                                      \
 567         /bin/false)
 568
 569 endif # KBUILD_EXTMOD
 570
 571 else
 572 # Dummy target needed, because used as prerequisite
 573 include/config/auto.conf: ;
 574 endif # $(dot-config)
 575
 576 # The all: target is the default when no target is given on the
 577 # command line.
 578 # This allow a user to issue only 'make' to build a kernel including modules
 579 # Defaults to vmlinux, but the arch makefile usually adds further targets
 580 all: vmlinux
 581
 582 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 583 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 584 else
 585 KBUILD_CFLAGS   += -O2
 586 endif
 587
 588 include $(srctree)/arch/$(SRCARCH)/Makefile
 589
 590 ifdef CONFIG_READABLE_ASM
 591 # Disable optimizations that make assembler listings hard to read.
 592 # reorder blocks reorders the control in the function
 593 # ipa clone creates specialized cloned functions
 594 # partial inlining inlines only parts of functions
 595 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 596                  $(call cc-option,-fno-ipa-cp-clone,) \
 597                  $(call cc-option,-fno-partial-inlining)
 598 endif
 599
 600 ifneq ($(CONFIG_FRAME_WARN),0)
 601 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 602 endif
 603
 604 # Handle stack protector mode.
 605 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 606   stackp-flag := -fstack-protector
 607   ifeq ($(call cc-option, $(stackp-flag)),)
 608     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
 609              -fstack-protector not supported by compiler)
 610   endif
 611 else
 612 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 613   stackp-flag := -fstack-protector-strong
 614   ifeq ($(call cc-option, $(stackp-flag)),)
 615     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 616               -fstack-protector-strong not supported by compiler)
 617   endif
 618 else
 619   # Force off for distro compilers that enable stack protector by default.
 620   stackp-flag := $(call cc-option, -fno-stack-protector)
 621 endif
 622 endif
 623 KBUILD_CFLAGS += $(stackp-flag)
 624
 625 # This warning generated too much noise in a regular build.
 626 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 627 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 628
 629 ifdef CONFIG_FRAME_POINTER
 630 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 631 else
 632 # Some targets (ARM with Thumb2, for example), can't be built with frame
 633 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 634 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 635 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 636 # -fomit-frame-pointer with FUNCTION_TRACER.
 637 ifndef CONFIG_FUNCTION_TRACER
 638 KBUILD_CFLAGS   += -fomit-frame-pointer
 639 endif
 640 endif
 641
 642 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 643
 644 ifdef CONFIG_DEBUG_INFO
 645 KBUILD_CFLAGS   += -g
 646 KBUILD_AFLAGS   += -Wa,--gdwarf-2
 647 endif
 648
 649 ifdef CONFIG_DEBUG_INFO_REDUCED
 650 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 651                    $(call cc-option,-fno-var-tracking)
 652 endif
 653
 654 ifdef CONFIG_FUNCTION_TRACER
 655 ifdef CONFIG_HAVE_FENTRY
 656 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 657 endif
 658 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
 659 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 660 ifdef CONFIG_DYNAMIC_FTRACE
 661         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 662                 BUILD_C_RECORDMCOUNT := y
 663                 export BUILD_C_RECORDMCOUNT
 664         endif
 665 endif
 666 endif
 667
 668 # We trigger additional mismatches with less inlining
 669 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 670 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 671 endif
 672
 673 # arch Makefile may override CC so keep this after arch Makefile is included
 674 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 675 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 676
 677 # warn about C99 declaration after statement
 678 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 679
 680 # disable pointer signed / unsigned warnings in gcc 4.0
 681 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 682
 683 # disable invalid "can't wrap" optimizations for signed / pointers
 684 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 685
 686 # conserve stack if available
 687 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 688
 689 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 690 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 691
 692 # require functions to have arguments in prototypes, not empty 'int foo()'
 693 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 694
 695 # Prohibit date/time macros, which would make the build non-deterministic
 696 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 697
 698 # use the deterministic mode of AR if available
 699 KBUILD_ARFLAGS := $(call ar-option,D)
 700
 701 # check for 'asm goto'
 702 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 703         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 704 endif
 705
 706 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 707 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 708 KBUILD_AFLAGS += $(KAFLAGS)
 709 KBUILD_CFLAGS += $(KCFLAGS)
 710
 711 # Use --build-id when available.
 712 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 713                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 714 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 715 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 716
 717 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 718 LDFLAGS_vmlinux += $(call ld-option, -X,)
 719 endif
 720
 721 # Default kernel image to build when no specific target is given.
 722 # KBUILD_IMAGE may be overruled on the command line or
 723 # set in the environment
 724 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 725 # this default value
 726 export KBUILD_IMAGE ?= vmlinux
 727
 728 #
 729 # INSTALL_PATH specifies where to place the updated kernel and system map
 730 # images. Default is /boot, but you can set it to other values
 731 export  INSTALL_PATH ?= /boot
 732
 733 #
 734 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 735 # relocations required by build roots.  This is not defined in the
 736 # makefile but the argument can be passed to make if needed.
 737 #
 738
 739 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 740 export MODLIB
 741
 742 #
 743 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 744 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 745 #  the default option --strip-debug will be used.  Otherwise,
 746 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 747
 748 ifdef INSTALL_MOD_STRIP
 749 ifeq ($(INSTALL_MOD_STRIP),1)
 750 mod_strip_cmd = $(STRIP) --strip-debug
 751 else
 752 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 753 endif # INSTALL_MOD_STRIP=1
 754 else
 755 mod_strip_cmd = true
 756 endif # INSTALL_MOD_STRIP
 757 export mod_strip_cmd
 758
 759 # Select initial ramdisk compression format, default is gzip(1).
 760 # This shall be used by the dracut(8) tool while creating an initramfs image.
 761 #
 762 INITRD_COMPRESS-y                  := gzip
 763 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 764 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 765 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 766 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 767 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 768 # do not export INITRD_COMPRESS, since we didn't actually
 769 # choose a sane default compression above.
 770 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 771
 772 ifdef CONFIG_MODULE_SIG_ALL
 773 MODSECKEY = ./signing_key.priv
 774 MODPUBKEY = ./signing_key.x509
 775 export MODPUBKEY
 776 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
 777 else
 778 mod_sign_cmd = true
 779 endif
 780 export mod_sign_cmd
 781
 782
 783 ifeq ($(KBUILD_EXTMOD),)
 784 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 785
 786 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 787                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 788                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 789
 790 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 791                      $(init-n) $(init-) \
 792                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 793                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 794
 795 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 796 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 797 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 798 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 799 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 800 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 801 libs-y          := $(libs-y1) $(libs-y2)
 802
 803 # Externally visible symbols (used by link-vmlinux.sh)
 804 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 805 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 806 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 807 export LDFLAGS_vmlinux
 808 # used by scripts/pacmage/Makefile
 809 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
 810
 811 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 812
 813 # Final link of vmlinux
 814       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 815 quiet_cmd_link-vmlinux = LINK    $@
 816
 817 # Include targets which we want to
 818 # execute if the rest of the kernel build went well.
 819 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 820 ifdef CONFIG_HEADERS_CHECK
 821         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 822 endif
 823 ifdef CONFIG_SAMPLES
 824         $(Q)$(MAKE) $(build)=samples
 825 endif
 826 ifdef CONFIG_BUILD_DOCSRC
 827         $(Q)$(MAKE) $(build)=Documentation
 828 endif
 829         +$(call if_changed,link-vmlinux)
 830
 831 # The actual objects are generated when descending,
 832 # make sure no implicit rule kicks in
 833 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 834
 835 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 836 # Preset locale variables to speed up the build process. Limit locale
 837 # tweaks to this spot to avoid wrong language settings when running
 838 # make menuconfig etc.
 839 # Error messages still appears in the original language
 840
 841 PHONY += $(vmlinux-dirs)
 842 $(vmlinux-dirs): prepare scripts
 843         $(Q)$(MAKE) $(build)=$@
 844
 845 define filechk_kernel.release
 846         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 847 endef
 848
 849 # Store (new) KERNELRELEASE string in include/config/kernel.release
 850 include/config/kernel.release: include/config/auto.conf FORCE
 851         $(call filechk,kernel.release)
 852
 853
 854 # Things we need to do before we recursively start building the kernel
 855 # or the modules are listed in "prepare".
 856 # A multi level approach is used. prepareN is processed before prepareN-1.
 857 # archprepare is used in arch Makefiles and when processed asm symlink,
 858 # version.h and scripts_basic is processed / created.
 859
 860 # Listed in dependency order
 861 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 862
 863 # prepare3 is used to check if we are building in a separate output directory,
 864 # and if so do:
 865 # 1) Check that make has not been executed in the kernel src $(srctree)
 866 prepare3: include/config/kernel.release
 867 ifneq ($(KBUILD_SRC),)
 868         @$(kecho) '  Using $(srctree) as source for kernel'
 869         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 870                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 871                 echo >&2 "  in the '$(srctree)' directory.";\
 872                 /bin/false; \
 873         fi;
 874 endif
 875
 876 # prepare2 creates a makefile if using a separate output directory
 877 prepare2: prepare3 outputmakefile asm-generic
 878
 879 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 880                    include/config/auto.conf
 881         $(cmd_crmodverdir)
 882
 883 archprepare: archheaders archscripts prepare1 scripts_basic
 884
 885 prepare0: archprepare FORCE
 886         $(Q)$(MAKE) $(build)=.
 887
 888 # All the preparing..
 889 prepare: prepare0
 890
 891 # Generate some files
 892 # ---------------------------------------------------------------------------
 893
 894 # KERNELRELEASE can change from a few different places, meaning version.h
 895 # needs to be updated, so this check is forced on all builds
 896
 897 uts_len := 64
 898 define filechk_utsrelease.h
 899         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 900           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 901           exit 1;                                                         \
 902         fi;                                                               \
 903         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 904 endef
 905
 906 define filechk_version.h
 907         (echo \#define LINUX_VERSION_CODE $(shell                         \
 908         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 909         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 910 endef
 911
 912 $(version_h): $(srctree)/Makefile FORCE
 913         $(call filechk,version.h)
 914
 915 include/generated/utsrelease.h: include/config/kernel.release FORCE
 916         $(call filechk,utsrelease.h)
 917
 918 PHONY += headerdep
 919 headerdep:
 920         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 921         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 922
 923 # ---------------------------------------------------------------------------
 924
 925 PHONY += depend dep
 926 depend dep:
 927         @echo '*** Warning: make $@ is unnecessary now.'
 928
 929 # ---------------------------------------------------------------------------
 930 # Firmware install
 931 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 932 export INSTALL_FW_PATH
 933
 934 PHONY += firmware_install
 935 firmware_install: FORCE
 936         @mkdir -p $(objtree)/firmware
 937         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 938
 939 # ---------------------------------------------------------------------------
 940 # Kernel headers
 941
 942 #Default location for installed headers
 943 export INSTALL_HDR_PATH = $(objtree)/usr
 944
 945 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 946
 947 # If we do an all arch process set dst to asm-$(hdr-arch)
 948 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 949
 950 PHONY += archheaders
 951 archheaders:
 952
 953 PHONY += archscripts
 954 archscripts:
 955
 956 PHONY += __headers
 957 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
 958         $(Q)$(MAKE) $(build)=scripts build_unifdef
 959
 960 PHONY += headers_install_all
 961 headers_install_all:
 962         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
 963
 964 PHONY += headers_install
 965 headers_install: __headers
 966         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
 967           $(error Headers not exportable for the $(SRCARCH) architecture))
 968         $(Q)$(MAKE) $(hdr-inst)=include/uapi
 969         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
 970
 971 PHONY += headers_check_all
 972 headers_check_all: headers_install_all
 973         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
 974
 975 PHONY += headers_check
 976 headers_check: headers_install
 977         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
 978         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
 979
 980 # ---------------------------------------------------------------------------
 981 # Modules
 982
 983 ifdef CONFIG_MODULES
 984
 985 # By default, build modules as well
 986
 987 all: modules
 988
 989 #       Build modules
 990 #
 991 #       A module can be listed more than once in obj-m resulting in
 992 #       duplicate lines in modules.order files.  Those are removed
 993 #       using awk while concatenating to the final file.
 994
 995 PHONY += modules
 996 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
 997         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
 998         @$(kecho) '  Building modules, stage 2.';
 999         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1000         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1001
1002 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1003         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1004
1005 %/modules.builtin: include/config/auto.conf
1006         $(Q)$(MAKE) $(modbuiltin)=$*
1007
1008
1009 # Target to prepare building external modules
1010 PHONY += modules_prepare
1011 modules_prepare: prepare scripts
1012
1013 # Target to install modules
1014 PHONY += modules_install
1015 modules_install: _modinst_ _modinst_post
1016
1017 PHONY += _modinst_
1018 _modinst_:
1019         @rm -rf $(MODLIB)/kernel
1020         @rm -f $(MODLIB)/source
1021         @mkdir -p $(MODLIB)/kernel
1022         @ln -s $(srctree) $(MODLIB)/source
1023         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1024                 rm -f $(MODLIB)/build ; \
1025                 ln -s $(objtree) $(MODLIB)/build ; \
1026         fi
1027         @cp -f $(objtree)/modules.order $(MODLIB)/
1028         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1029         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1030
1031 # This depmod is only for convenience to give the initial
1032 # boot a modules.dep even before / is mounted read-write.  However the
1033 # boot script depmod is the master version.
1034 PHONY += _modinst_post
1035 _modinst_post: _modinst_
1036         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1037         $(call cmd,depmod)
1038
1039 ifeq ($(CONFIG_MODULE_SIG), y)
1040 PHONY += modules_sign
1041 modules_sign:
1042         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1043 endif
1044
1045 else # CONFIG_MODULES
1046
1047 # Modules not configured
1048 # ---------------------------------------------------------------------------
1049
1050 modules modules_install: FORCE
1051         @echo >&2
1052         @echo >&2 "The present kernel configuration has modules disabled."
1053         @echo >&2 "Type 'make config' and enable loadable module support."
1054         @echo >&2 "Then build a kernel with module support enabled."
1055         @echo >&2
1056         @exit 1
1057
1058 endif # CONFIG_MODULES
1059
1060 ###
1061 # Cleaning is done on three levels.
1062 # make clean     Delete most generated files
1063 #                Leave enough to build external modules
1064 # make mrproper  Delete the current configuration, and all generated files
1065 # make distclean Remove editor backup files, patch leftover files and the like
1066
1067 # Directories & files removed with 'make clean'
1068 CLEAN_DIRS  += $(MODVERDIR)
1069
1070 # Directories & files removed with 'make mrproper'
1071 MRPROPER_DIRS  += include/config usr/include include/generated          \
1072                   arch/*/include/generated
1073 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1074                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1075                   signing_key.priv signing_key.x509 x509.genkey         \
1076                   extra_certificates signing_key.x509.keyid             \
1077                   signing_key.x509.signer
1078
1079 # clean - Delete most, but leave enough to build external modules
1080 #
1081 clean: rm-dirs  := $(CLEAN_DIRS)
1082 clean: rm-files := $(CLEAN_FILES)
1083 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1084
1085 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1086 $(clean-dirs):
1087         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1088
1089 vmlinuxclean:
1090         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1091
1092 clean: archclean vmlinuxclean
1093
1094 # mrproper - Delete all generated files, including .config
1095 #
1096 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1097 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1098 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1099
1100 PHONY += $(mrproper-dirs) mrproper archmrproper
1101 $(mrproper-dirs):
1102         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1103
1104 mrproper: clean archmrproper $(mrproper-dirs)
1105         $(call cmd,rmdirs)
1106         $(call cmd,rmfiles)
1107
1108 # distclean
1109 #
1110 PHONY += distclean
1111
1112 distclean: mrproper
1113         @find $(srctree) $(RCS_FIND_IGNORE) \
1114                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1115                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1116                 -o -name '.*.rej' \
1117                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1118                 -type f -print | xargs rm -f
1119
1120
1121 # Packaging of the kernel to various formats
1122 # ---------------------------------------------------------------------------
1123 # rpm target kept for backward compatibility
1124 package-dir     := $(srctree)/scripts/package
1125
1126 %src-pkg: FORCE
1127         $(Q)$(MAKE) $(build)=$(package-dir) $@
1128 %pkg: include/config/kernel.release FORCE
1129         $(Q)$(MAKE) $(build)=$(package-dir) $@
1130 rpm: include/config/kernel.release FORCE
1131         $(Q)$(MAKE) $(build)=$(package-dir) $@
1132
1133
1134 # Brief documentation of the typical targets used
1135 # ---------------------------------------------------------------------------
1136
1137 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1138 boards := $(notdir $(boards))
1139 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1140 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1141
1142 help:
1143         @echo  'Cleaning targets:'
1144         @echo  '  clean           - Remove most generated files but keep the config and'
1145         @echo  '                    enough build support to build external modules'
1146         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1147         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1148         @echo  ''
1149         @echo  'Configuration targets:'
1150         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1151         @echo  ''
1152         @echo  'Other generic targets:'
1153         @echo  '  all             - Build all targets marked with [*]'
1154         @echo  '* vmlinux         - Build the bare kernel'
1155         @echo  '* modules         - Build all modules'
1156         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1157         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1158         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1159         @echo  '  dir/            - Build all files in dir and below'
1160         @echo  '  dir/file.[oisS] - Build specified target only'
1161         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1162         @echo  '                    (requires a recent binutils and recent build (System.map))'
1163         @echo  '  dir/file.ko     - Build module including final link'
1164         @echo  '  modules_prepare - Set up for building external modules'
1165         @echo  '  tags/TAGS       - Generate tags file for editors'
1166         @echo  '  cscope          - Generate cscope index'
1167         @echo  '  gtags           - Generate GNU GLOBAL index'
1168         @echo  '  kernelrelease   - Output the release version string'
1169         @echo  '  kernelversion   - Output the version stored in Makefile'
1170         @echo  '  image_name      - Output the image name'
1171         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1172          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1173          echo  ''
1174         @echo  'Static analysers'
1175         @echo  '  checkstack      - Generate a list of stack hogs'
1176         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1177         @echo  '  versioncheck    - Sanity check on version.h usage'
1178         @echo  '  includecheck    - Check for duplicate included header files'
1179         @echo  '  export_report   - List the usages of all exported symbols'
1180         @echo  '  headers_check   - Sanity check on exported headers'
1181         @echo  '  headerdep       - Detect inclusion cycles in headers'
1182         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1183         @echo  ''
1184         @echo  'Kernel packaging:'
1185         @$(MAKE) $(build)=$(package-dir) help
1186         @echo  ''
1187         @echo  'Documentation targets:'
1188         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1189         @echo  ''
1190         @echo  'Architecture specific targets ($(SRCARCH)):'
1191         @$(if $(archhelp),$(archhelp),\
1192                 echo '  No architecture specific help defined for $(SRCARCH)')
1193         @echo  ''
1194         @$(if $(boards), \
1195                 $(foreach b, $(boards), \
1196                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1197                 echo '')
1198         @$(if $(board-dirs), \
1199                 $(foreach b, $(board-dirs), \
1200                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1201                 printf "  %-16s - Show all of the above\\n" help-boards; \
1202                 echo '')
1203
1204         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1205         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1206         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1207         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1208         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1209         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1210         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1211         @echo  '                1: warnings which may be relevant and do not occur too often'
1212         @echo  '                2: warnings which occur quite often but may still be relevant'
1213         @echo  '                3: more obscure warnings, can most likely be ignored'
1214         @echo  '                Multiple levels can be combined with W=12 or W=123'
1215         @echo  ''
1216         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1217         @echo  'For further info see the ./README file'
1218
1219
1220 help-board-dirs := $(addprefix help-,$(board-dirs))
1221
1222 help-boards: $(help-board-dirs)
1223
1224 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1225
1226 $(help-board-dirs): help-%:
1227         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1228         @$(if $(boards-per-dir), \
1229                 $(foreach b, $(boards-per-dir), \
1230                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1231                 echo '')
1232
1233
1234 # Documentation targets
1235 # ---------------------------------------------------------------------------
1236 %docs: scripts_basic FORCE
1237         $(Q)$(MAKE) $(build)=scripts build_docproc
1238         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1239
1240 else # KBUILD_EXTMOD
1241
1242 ###
1243 # External module support.
1244 # When building external modules the kernel used as basis is considered
1245 # read-only, and no consistency checks are made and the make
1246 # system is not used on the basis kernel. If updates are required
1247 # in the basis kernel ordinary make commands (without M=...) must
1248 # be used.
1249 #
1250 # The following are the only valid targets when building external
1251 # modules.
1252 # make M=dir clean     Delete all automatically generated files
1253 # make M=dir modules   Make all modules in specified dir
1254 # make M=dir           Same as 'make M=dir modules'
1255 # make M=dir modules_install
1256 #                      Install the modules built in the module directory
1257 #                      Assumes install directory is already created
1258
1259 # We are always building modules
1260 KBUILD_MODULES := 1
1261 PHONY += crmodverdir
1262 crmodverdir:
1263         $(cmd_crmodverdir)
1264
1265 PHONY += $(objtree)/Module.symvers
1266 $(objtree)/Module.symvers:
1267         @test -e $(objtree)/Module.symvers || ( \
1268         echo; \
1269         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1270         echo "           is missing; modules will have no dependencies and modversions."; \
1271         echo )
1272
1273 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1274 PHONY += $(module-dirs) modules
1275 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1276         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1277
1278 modules: $(module-dirs)
1279         @$(kecho) '  Building modules, stage 2.';
1280         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1281
1282 PHONY += modules_install
1283 modules_install: _emodinst_ _emodinst_post
1284
1285 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1286 PHONY += _emodinst_
1287 _emodinst_:
1288         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1289         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1290
1291 PHONY += _emodinst_post
1292 _emodinst_post: _emodinst_
1293         $(call cmd,depmod)
1294
1295 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1296
1297 PHONY += $(clean-dirs) clean
1298 $(clean-dirs):
1299         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1300
1301 clean:  rm-dirs := $(MODVERDIR)
1302 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1303
1304 help:
1305         @echo  '  Building external modules.'
1306         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1307         @echo  ''
1308         @echo  '  modules         - default target, build the module(s)'
1309         @echo  '  modules_install - install the module'
1310         @echo  '  clean           - remove generated files in module directory only'
1311         @echo  ''
1312
1313 # Dummies...
1314 PHONY += prepare scripts
1315 prepare: ;
1316 scripts: ;
1317 endif # KBUILD_EXTMOD
1318
1319 clean: $(clean-dirs)
1320         $(call cmd,rmdirs)
1321         $(call cmd,rmfiles)
1322         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1323                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1324                 -o -name '*.ko.*' \
1325                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1326                 -o -name '*.symtypes' -o -name 'modules.order' \
1327                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1328                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1329
1330 # Generate tags for editors
1331 # ---------------------------------------------------------------------------
1332 quiet_cmd_tags = GEN     $@
1333       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1334
1335 tags TAGS cscope gtags: FORCE
1336         $(call cmd,tags)
1337
1338 # Scripts to check various things for consistency
1339 # ---------------------------------------------------------------------------
1340
1341 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1342
1343 includecheck:
1344         find $(srctree)/* $(RCS_FIND_IGNORE) \
1345                 -name '*.[hcS]' -type f -print | sort \
1346                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1347
1348 versioncheck:
1349         find $(srctree)/* $(RCS_FIND_IGNORE) \
1350                 -name '*.[hcS]' -type f -print | sort \
1351                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1352
1353 coccicheck:
1354         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1355
1356 namespacecheck:
1357         $(PERL) $(srctree)/scripts/namespace.pl
1358
1359 export_report:
1360         $(PERL) $(srctree)/scripts/export_report.pl
1361
1362 endif #ifeq ($(config-targets),1)
1363 endif #ifeq ($(mixed-targets),1)
1364
1365 PHONY += checkstack kernelrelease kernelversion image_name
1366
1367 # UML needs a little special treatment here.  It wants to use the host
1368 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1369 # else wants $(ARCH), including people doing cross-builds, which means
1370 # that $(SUBARCH) doesn't work here.
1371 ifeq ($(ARCH), um)
1372 CHECKSTACK_ARCH := $(SUBARCH)
1373 else
1374 CHECKSTACK_ARCH := $(ARCH)
1375 endif
1376 checkstack:
1377         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1378         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1379
1380 kernelrelease:
1381         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1382
1383 kernelversion:
1384         @echo $(KERNELVERSION)
1385
1386 image_name:
1387         @echo $(KBUILD_IMAGE)
1388
1389 # Clear a bunch of variables before executing the submake
1390 tools/: FORCE
1391         $(Q)mkdir -p $(objtree)/tools
1392         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1393
1394 tools/%: FORCE
1395         $(Q)mkdir -p $(objtree)/tools
1396         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1397
1398 # Single targets
1399 # ---------------------------------------------------------------------------
1400 # Single targets are compatible with:
1401 # - build with mixed source and output
1402 # - build with separate output dir 'make O=...'
1403 # - external modules
1404 #
1405 #  target-dir => where to store outputfile
1406 #  build-dir  => directory in kernel source tree to use
1407
1408 ifeq ($(KBUILD_EXTMOD),)
1409         build-dir  = $(patsubst %/,%,$(dir $@))
1410         target-dir = $(dir $@)
1411 else
1412         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1413         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1414         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1415 endif
1416
1417 %.s: %.c prepare scripts FORCE
1418         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1419 %.i: %.c prepare scripts FORCE
1420         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1421 %.o: %.c prepare scripts FORCE
1422         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1423 %.lst: %.c prepare scripts FORCE
1424         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1425 %.s: %.S prepare scripts FORCE
1426         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1427 %.o: %.S prepare scripts FORCE
1428         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1429 %.symtypes: %.c prepare scripts FORCE
1430         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1431
1432 # Modules
1433 /: prepare scripts FORCE
1434         $(cmd_crmodverdir)
1435         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1436         $(build)=$(build-dir)
1437 %/: prepare scripts FORCE
1438         $(cmd_crmodverdir)
1439         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1440         $(build)=$(build-dir)
1441 %.ko: prepare scripts FORCE
1442         $(cmd_crmodverdir)
1443         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1444         $(build)=$(build-dir) $(@:.ko=.o)
1445         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1446
1447 # FIXME Should go into a make.lib or something
1448 # ===========================================================================
1449
1450 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1451       cmd_rmdirs = rm -rf $(rm-dirs)
1452
1453 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1454       cmd_rmfiles = rm -f $(rm-files)
1455
1456 # Run depmod only if we have System.map and depmod is executable
1457 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1458       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1459                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1460
1461 # Create temporary dir for module support files
1462 # clean it up only when building all modules
1463 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1464                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1465
1466 # read all saved command lines
1467
1468 targets := $(wildcard $(sort $(targets)))
1469 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1470
1471 ifneq ($(cmd_files),)
1472   $(cmd_files): ;       # Do not try to update included dependency files
1473   include $(cmd_files)
1474 endif
1475
1476 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1477 # Usage:
1478 # $(Q)$(MAKE) $(clean)=dir
1479 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1480
1481 endif   # skip-makefile
1482
1483 PHONY += FORCE
1484 FORCE:
1485
1486 # Declare the contents of the .PHONY variable as phony.  We keep that
1487 # information in a variable so we can use it in if_changed and friends.
1488 .PHONY: $(PHONY)