Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 4
   3 SUBLEVEL = 234
   4 EXTRAVERSION =
   5 NAME = Blurry Fish Butt
   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 # o Do not use make's built-in rules and variables
  14 #   (this increases performance and avoids hard-to-debug behaviour);
  15 # o Look for make include files relative to root of kernel src
  16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  17
  18 # Avoid funny character set dependencies
  19 unexport LC_ALL
  20 LC_COLLATE=C
  21 LC_NUMERIC=C
  22 export LC_COLLATE LC_NUMERIC
  23
  24 # Avoid interference with shell env settings
  25 unexport GREP_OPTIONS
  26
  27 # We are using a recursive build, so we need to do a little thinking
  28 # to get the ordering right.
  29 #
  30 # Most importantly: sub-Makefiles should only ever modify files in
  31 # their own directory. If in some directory we have a dependency on
  32 # a file in another dir (which doesn't happen often, but it's often
  33 # unavoidable when linking the built-in.o targets which finally
  34 # turn into vmlinux), we will call a sub make in that other dir, and
  35 # after that we are sure that everything which is in that other dir
  36 # is now up to date.
  37 #
  38 # The only cases where we need to modify files which have global
  39 # effects are thus separated out and done before the recursive
  40 # descending is started. They are now explicitly listed as the
  41 # prepare rule.
  42
  43 # Beautify output
  44 # ---------------------------------------------------------------------------
  45 #
  46 # Normally, we echo the whole command before executing it. By making
  47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  48 # $(quiet) to choose other forms of output instead, e.g.
  49 #
  50 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  51 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  52 #
  53 # If $(quiet) is empty, the whole command will be printed.
  54 # If it is set to "quiet_", only the short version will be printed.
  55 # If it is set to "silent_", nothing will be printed at all, since
  56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  57 #
  58 # A simple variant is to prefix commands with $(Q) - that's useful
  59 # for commands that shall be hidden in non-verbose mode.
  60 #
  61 #       $(Q)ln $@ :<
  62 #
  63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  65 #
  66 # To put more focus on warnings, be less verbose as default
  67 # Use 'make V=1' to see the full commands
  68
  69 ifeq ("$(origin V)", "command line")
  70   KBUILD_VERBOSE = $(V)
  71 endif
  72 ifndef KBUILD_VERBOSE
  73   KBUILD_VERBOSE = 0
  74 endif
  75
  76 ifeq ($(KBUILD_VERBOSE),1)
  77   quiet =
  78   Q =
  79 else
  80   quiet=quiet_
  81   Q = @
  82 endif
  83
  84 # If the user is running make -s (silent mode), suppress echoing of
  85 # commands
  86
  87 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
  88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  89   quiet=silent_
  90   tools_silent=s
  91 endif
  92 else                                    # make-3.8x
  93 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  94   quiet=silent_
  95   tools_silent=-s
  96 endif
  97 endif
  98
  99 export quiet Q KBUILD_VERBOSE
 100
 101 # kbuild supports saving output files in a separate directory.
 102 # To locate output files in a separate directory two syntaxes are supported.
 103 # In both cases the working directory must be the root of the kernel src.
 104 # 1) O=
 105 # Use "make O=dir/to/store/output/files/"
 106 #
 107 # 2) Set KBUILD_OUTPUT
 108 # Set the environment variable KBUILD_OUTPUT to point to the directory
 109 # where the output files shall be placed.
 110 # export KBUILD_OUTPUT=dir/to/store/output/files/
 111 # make
 112 #
 113 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 114 # variable.
 115
 116 # KBUILD_SRC is set on invocation of make in OBJ directory
 117 # KBUILD_SRC is not intended to be used by the regular user (for now)
 118 ifeq ($(KBUILD_SRC),)
 119
 120 # OK, Make called in directory where kernel src resides
 121 # Do we want to locate output files in a separate directory?
 122 ifeq ("$(origin O)", "command line")
 123   KBUILD_OUTPUT := $(O)
 124 endif
 125
 126 # That's our default target when none is given on the command line
 127 PHONY := _all
 128 _all:
 129
 130 # Cancel implicit rules on top Makefile
 131 $(CURDIR)/Makefile Makefile: ;
 132
 133 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 134   $(error main directory cannot contain spaces nor colons)
 135 endif
 136
 137 ifneq ($(KBUILD_OUTPUT),)
 138 # Invoke a second make in the output directory, passing relevant variables
 139 # check that the output directory actually exists
 140 saved-output := $(KBUILD_OUTPUT)
 141 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 142                                                                 && /bin/pwd)
 143 $(if $(KBUILD_OUTPUT),, \
 144      $(error failed to create output directory "$(saved-output)"))
 145
 146 PHONY += $(MAKECMDGOALS) sub-make
 147
 148 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 149         @:
 150
 151 sub-make: FORCE
 152         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 153         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 154
 155 # Leave processing to above invocation of make
 156 skip-makefile := 1
 157 endif # ifneq ($(KBUILD_OUTPUT),)
 158 endif # ifeq ($(KBUILD_SRC),)
 159
 160 # We process the rest of the Makefile if this is the final invocation of make
 161 ifeq ($(skip-makefile),)
 162
 163 # Do not print "Entering directory ...",
 164 # but we want to display it when entering to the output directory
 165 # so that IDEs/editors are able to understand relative filenames.
 166 MAKEFLAGS += --no-print-directory
 167
 168 # Call a source code checker (by default, "sparse") as part of the
 169 # C compilation.
 170 #
 171 # Use 'make C=1' to enable checking of only re-compiled files.
 172 # Use 'make C=2' to enable checking of *all* source files, regardless
 173 # of whether they are re-compiled or not.
 174 #
 175 # See the file "Documentation/sparse.txt" for more details, including
 176 # where to get the "sparse" utility.
 177
 178 ifeq ("$(origin C)", "command line")
 179   KBUILD_CHECKSRC = $(C)
 180 endif
 181 ifndef KBUILD_CHECKSRC
 182   KBUILD_CHECKSRC = 0
 183 endif
 184
 185 # Use make M=dir to specify directory of external module to build
 186 # Old syntax make ... SUBDIRS=$PWD is still supported
 187 # Setting the environment variable KBUILD_EXTMOD take precedence
 188 ifdef SUBDIRS
 189   KBUILD_EXTMOD ?= $(SUBDIRS)
 190 endif
 191
 192 ifeq ("$(origin M)", "command line")
 193   KBUILD_EXTMOD := $(M)
 194 endif
 195
 196 # If building an external module we do not care about the all: rule
 197 # but instead _all depend on modules
 198 PHONY += all
 199 ifeq ($(KBUILD_EXTMOD),)
 200 _all: all
 201 else
 202 _all: modules
 203 endif
 204
 205 ifeq ($(KBUILD_SRC),)
 206         # building in the source tree
 207         srctree := .
 208 else
 209         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 210                 # building in a subdirectory of the source tree
 211                 srctree := ..
 212         else
 213                 srctree := $(KBUILD_SRC)
 214         endif
 215 endif
 216 objtree         := .
 217 src             := $(srctree)
 218 obj             := $(objtree)
 219
 220 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 221
 222 export srctree objtree VPATH
 223
 224 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 225 # first, and if a usermode build is happening, the "ARCH=um" on the command
 226 # line overrides the setting of ARCH below.  If a native build is happening,
 227 # then ARCH is assigned, getting whatever value it gets normally, and
 228 # SUBARCH is subsequently ignored.
 229
 230 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 231                                   -e s/sun4u/sparc64/ \
 232                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 233                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 234                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 235                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 236
 237 # Cross compiling and selecting different set of gcc/bin-utils
 238 # ---------------------------------------------------------------------------
 239 #
 240 # When performing cross compilation for other architectures ARCH shall be set
 241 # to the target architecture. (See arch/* for the possibilities).
 242 # ARCH can be set during invocation of make:
 243 # make ARCH=ia64
 244 # Another way is to have ARCH set in the environment.
 245 # The default ARCH is the host where make is executed.
 246
 247 # CROSS_COMPILE specify the prefix used for all executables used
 248 # during compilation. Only gcc and related bin-utils executables
 249 # are prefixed with $(CROSS_COMPILE).
 250 # CROSS_COMPILE can be set on the command line
 251 # make CROSS_COMPILE=ia64-linux-
 252 # Alternatively CROSS_COMPILE can be set in the environment.
 253 # A third alternative is to store a setting in .config so that plain
 254 # "make" in the configured kernel build directory always uses that.
 255 # Default value for CROSS_COMPILE is not to prefix executables
 256 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 257 ARCH            ?= $(SUBARCH)
 258 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 259
 260 # Architecture as present in compile.h
 261 UTS_MACHINE     := $(ARCH)
 262 SRCARCH         := $(ARCH)
 263
 264 # Additional ARCH settings for x86
 265 ifeq ($(ARCH),i386)
 266         SRCARCH := x86
 267 endif
 268 ifeq ($(ARCH),x86_64)
 269         SRCARCH := x86
 270 endif
 271
 272 # Additional ARCH settings for sparc
 273 ifeq ($(ARCH),sparc32)
 274        SRCARCH := sparc
 275 endif
 276 ifeq ($(ARCH),sparc64)
 277        SRCARCH := sparc
 278 endif
 279
 280 # Additional ARCH settings for sh
 281 ifeq ($(ARCH),sh64)
 282        SRCARCH := sh
 283 endif
 284
 285 # Additional ARCH settings for tile
 286 ifeq ($(ARCH),tilepro)
 287        SRCARCH := tile
 288 endif
 289 ifeq ($(ARCH),tilegx)
 290        SRCARCH := tile
 291 endif
 292
 293 # Where to locate arch specific headers
 294 hdr-arch  := $(SRCARCH)
 295
 296 KCONFIG_CONFIG  ?= .config
 297 export KCONFIG_CONFIG
 298
 299 # SHELL used by kbuild
 300 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 301           else if [ -x /bin/bash ]; then echo /bin/bash; \
 302           else echo sh; fi ; fi)
 303
 304 HOSTCC       = gcc
 305 HOSTCXX      = g++
 306 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 307 HOSTCXXFLAGS = -O2
 308
 309 # Decide whether to build built-in, modular, or both.
 310 # Normally, just do built-in.
 311
 312 KBUILD_MODULES :=
 313 KBUILD_BUILTIN := 1
 314
 315 # If we have only "make modules", don't compile built-in objects.
 316 ifeq ($(MAKECMDGOALS),modules)
 317   KBUILD_BUILTIN :=
 318 endif
 319
 320 # If we have "make <whatever> modules", compile modules
 321 # in addition to whatever we do anyway.
 322 # Just "make" or "make all" shall build modules as well
 323
 324 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 325   KBUILD_MODULES := 1
 326 endif
 327
 328 ifeq ($(MAKECMDGOALS),)
 329   KBUILD_MODULES := 1
 330 endif
 331
 332 export KBUILD_MODULES KBUILD_BUILTIN
 333 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 334
 335 # We need some generic definitions (do not try to remake the file).
 336 scripts/Kbuild.include: ;
 337 include scripts/Kbuild.include
 338
 339 # Make variables (CC, etc...)
 340 AS              = $(CROSS_COMPILE)as
 341 LD              = $(CROSS_COMPILE)ld
 342 CC              = $(CROSS_COMPILE)gcc
 343 CPP             = $(CC) -E
 344 AR              = $(CROSS_COMPILE)ar
 345 NM              = $(CROSS_COMPILE)nm
 346 STRIP           = $(CROSS_COMPILE)strip
 347 OBJCOPY         = $(CROSS_COMPILE)objcopy
 348 OBJDUMP         = $(CROSS_COMPILE)objdump
 349 AWK             = awk
 350 GENKSYMS        = scripts/genksyms/genksyms
 351 INSTALLKERNEL  := installkernel
 352 DEPMOD          = /sbin/depmod
 353 PERL            = perl
 354 PYTHON          = python
 355 CHECK           = sparse
 356
 357 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 358                   -Wbitwise -Wno-return-void $(CF)
 359 CFLAGS_MODULE   =
 360 AFLAGS_MODULE   =
 361 LDFLAGS_MODULE  =
 362 CFLAGS_KERNEL   =
 363 AFLAGS_KERNEL   =
 364 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
 365
 366
 367 # Use USERINCLUDE when you must reference the UAPI directories only.
 368 USERINCLUDE    := \
 369                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 370                 -Iarch/$(hdr-arch)/include/generated/uapi \
 371                 -I$(srctree)/include/uapi \
 372                 -Iinclude/generated/uapi \
 373                 -include $(srctree)/include/linux/kconfig.h
 374
 375 # Use LINUXINCLUDE when you must reference the include/ directory.
 376 # Needed to be compatible with the O= option
 377 LINUXINCLUDE    := \
 378                 -I$(srctree)/arch/$(hdr-arch)/include \
 379                 -Iarch/$(hdr-arch)/include/generated/uapi \
 380                 -Iarch/$(hdr-arch)/include/generated \
 381                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 382                 -Iinclude \
 383                 $(USERINCLUDE)
 384
 385 KBUILD_CPPFLAGS := -D__KERNEL__
 386
 387 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 388                    -fno-strict-aliasing -fno-common \
 389                    -Werror-implicit-function-declaration \
 390                    -Wno-format-security \
 391                    -std=gnu89 $(call cc-option,-fno-PIE)
 392
 393
 394 KBUILD_AFLAGS_KERNEL :=
 395 KBUILD_CFLAGS_KERNEL :=
 396 KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
 397 KBUILD_AFLAGS_MODULE  := -DMODULE
 398 KBUILD_CFLAGS_MODULE  := -DMODULE
 399 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 400
 401 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 402 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 403 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 404
 405 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 406 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 407 export CPP AR NM STRIP OBJCOPY OBJDUMP
 408 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 409 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 410
 411 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 412 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 413 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE
 414 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 415 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 416 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 417 export KBUILD_ARFLAGS
 418
 419 # When compiling out-of-tree modules, put MODVERDIR in the module
 420 # tree rather than in the kernel tree. The kernel tree might
 421 # even be read-only.
 422 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 423
 424 # Files to ignore in find ... statements
 425
 426 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 427                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 428                           -prune -o
 429 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 430                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 431
 432 # ===========================================================================
 433 # Rules shared between *config targets and build targets
 434
 435 # Basic helpers built in scripts/
 436 PHONY += scripts_basic
 437 scripts_basic:
 438         $(Q)$(MAKE) $(build)=scripts/basic
 439         $(Q)rm -f .tmp_quiet_recordmcount
 440
 441 # To avoid any implicit rule to kick in, define an empty command.
 442 scripts/basic/%: scripts_basic ;
 443
 444 PHONY += outputmakefile
 445 # outputmakefile generates a Makefile in the output directory, if using a
 446 # separate output directory. This allows convenient use of make in the
 447 # output directory.
 448 outputmakefile:
 449 ifneq ($(KBUILD_SRC),)
 450         $(Q)ln -fsn $(srctree) source
 451         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 452             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 453 endif
 454
 455 # Support for using generic headers in asm-generic
 456 PHONY += asm-generic
 457 asm-generic:
 458         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 459                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 460         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 461                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 462
 463 # To make sure we do not include .config for any of the *config targets
 464 # catch them early, and hand them over to scripts/kconfig/Makefile
 465 # It is allowed to specify more targets when calling make, including
 466 # mixing *config targets and build targets.
 467 # For example 'make oldconfig all'.
 468 # Detect when mixed targets is specified, and make a second invocation
 469 # of make so .config is not included in this case either (for *config).
 470
 471 version_h := include/generated/uapi/linux/version.h
 472 old_version_h := include/linux/version.h
 473
 474 no-dot-config-targets := clean mrproper distclean \
 475                          cscope gtags TAGS tags help% %docs check% coccicheck \
 476                          $(version_h) headers_% archheaders archscripts \
 477                          kernelversion %src-pkg
 478
 479 config-targets := 0
 480 mixed-targets  := 0
 481 dot-config     := 1
 482
 483 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 484         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 485                 dot-config := 0
 486         endif
 487 endif
 488
 489 ifeq ($(KBUILD_EXTMOD),)
 490         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 491                 config-targets := 1
 492                 ifneq ($(words $(MAKECMDGOALS)),1)
 493                         mixed-targets := 1
 494                 endif
 495         endif
 496 endif
 497 # install and module_install need also be processed one by one
 498 ifneq ($(filter install,$(MAKECMDGOALS)),)
 499         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 500                 mixed-targets := 1
 501         endif
 502 endif
 503
 504 ifeq ($(mixed-targets),1)
 505 # ===========================================================================
 506 # We're called with mixed targets (*config and build targets).
 507 # Handle them one by one.
 508
 509 PHONY += $(MAKECMDGOALS) __build_one_by_one
 510
 511 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 512         @:
 513
 514 __build_one_by_one:
 515         $(Q)set -e; \
 516         for i in $(MAKECMDGOALS); do \
 517                 $(MAKE) -f $(srctree)/Makefile $$i; \
 518         done
 519
 520 else
 521 ifeq ($(config-targets),1)
 522 # ===========================================================================
 523 # *config targets only - make sure prerequisites are updated, and descend
 524 # in scripts/kconfig to make the *config target
 525
 526 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 527 # KBUILD_DEFCONFIG may point out an alternative default configuration
 528 # used for 'make defconfig'
 529 include arch/$(SRCARCH)/Makefile
 530 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 531
 532 config: scripts_basic outputmakefile FORCE
 533         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 534
 535 %config: scripts_basic outputmakefile FORCE
 536         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 537
 538 else
 539 # ===========================================================================
 540 # Build targets only - this includes vmlinux, arch specific targets, clean
 541 # targets and others. In general all targets except *config targets.
 542
 543 ifeq ($(KBUILD_EXTMOD),)
 544 # Additional helpers built in scripts/
 545 # Carefully list dependencies so we do not try to build scripts twice
 546 # in parallel
 547 PHONY += scripts
 548 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 549          asm-generic
 550         $(Q)$(MAKE) $(build)=$(@)
 551
 552 # Objects we will link into vmlinux / subdirs we need to visit
 553 init-y          := init/
 554 drivers-y       := drivers/ sound/ firmware/
 555 net-y           := net/
 556 libs-y          := lib/
 557 core-y          := usr/
 558 virt-y          := virt/
 559 endif # KBUILD_EXTMOD
 560
 561 ifeq ($(dot-config),1)
 562 # Read in config
 563 -include include/config/auto.conf
 564
 565 ifeq ($(KBUILD_EXTMOD),)
 566 # Read in dependencies to all Kconfig* files, make sure to run
 567 # oldconfig if changes are detected.
 568 -include include/config/auto.conf.cmd
 569
 570 # To avoid any implicit rule to kick in, define an empty command
 571 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 572
 573 # If .config is newer than include/config/auto.conf, someone tinkered
 574 # with it and forgot to run make oldconfig.
 575 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 576 # we execute the config step to be sure to catch updated Kconfig files
 577 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 578         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 579 else
 580 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 581 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 582 PHONY += include/config/auto.conf
 583
 584 include/config/auto.conf:
 585         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 586         echo >&2;                                                       \
 587         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 588         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 589         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 590         echo >&2 ;                                                      \
 591         /bin/false)
 592
 593 endif # KBUILD_EXTMOD
 594
 595 else
 596 # Dummy target needed, because used as prerequisite
 597 include/config/auto.conf: ;
 598 endif # $(dot-config)
 599
 600 # The all: target is the default when no target is given on the
 601 # command line.
 602 # This allow a user to issue only 'make' to build a kernel including modules
 603 # Defaults to vmlinux, but the arch makefile usually adds further targets
 604 all: vmlinux
 605
 606 ifeq ($(cc-name),clang)
 607 ifneq ($(CROSS_COMPILE),)
 608 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 609 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 610 CLANG_PREFIX    := --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
 611 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 612 endif
 613 ifneq ($(GCC_TOOLCHAIN),)
 614 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 615 endif
 616 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
 617 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
 618 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 619 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 620 endif
 621
 622 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 623 # values of the respective KBUILD_* variables
 624 ARCH_CPPFLAGS :=
 625 ARCH_AFLAGS :=
 626 ARCH_CFLAGS :=
 627 include arch/$(SRCARCH)/Makefile
 628
 629 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 630 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 631 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 632 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 633 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 634 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 635 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 636
 637 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 638 KBUILD_CFLAGS   += -Os
 639 else
 640 ifdef CONFIG_PROFILE_ALL_BRANCHES
 641 KBUILD_CFLAGS   += -O2
 642 else
 643 KBUILD_CFLAGS   += -O2
 644 endif
 645 endif
 646
 647 # Tell gcc to never replace conditional load with a non-conditional one
 648 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 649 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 650
 651 # check for 'asm goto'
 652 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 653         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 654         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 655 endif
 656
 657 ifdef CONFIG_READABLE_ASM
 658 # Disable optimizations that make assembler listings hard to read.
 659 # reorder blocks reorders the control in the function
 660 # ipa clone creates specialized cloned functions
 661 # partial inlining inlines only parts of functions
 662 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 663                  $(call cc-option,-fno-ipa-cp-clone,) \
 664                  $(call cc-option,-fno-partial-inlining)
 665 endif
 666
 667 ifneq ($(CONFIG_FRAME_WARN),0)
 668 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 669 endif
 670
 671 # Handle stack protector mode.
 672 #
 673 # Since kbuild can potentially perform two passes (first with the old
 674 # .config values and then with updated .config values), we cannot error out
 675 # if a desired compiler option is unsupported. If we were to error, kbuild
 676 # could never get to the second pass and actually notice that we changed
 677 # the option to something that was supported.
 678 #
 679 # Additionally, we don't want to fallback and/or silently change which compiler
 680 # flags will be used, since that leads to producing kernels with different
 681 # security feature characteristics depending on the compiler used. ("But I
 682 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
 683 #
 684 # The middle ground is to warn here so that the failed option is obvious, but
 685 # to let the build fail with bad compiler flags so that we can't produce a
 686 # kernel when there is a CONFIG and compiler mismatch.
 687 #
 688 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 689   stackp-flag := -fstack-protector
 690   ifeq ($(call cc-option, $(stackp-flag)),)
 691     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
 692              -fstack-protector not supported by compiler)
 693   endif
 694 else
 695 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 696   stackp-flag := -fstack-protector-strong
 697   ifeq ($(call cc-option, $(stackp-flag)),)
 698     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 699               -fstack-protector-strong not supported by compiler)
 700   endif
 701 else
 702   # Force off for distro compilers that enable stack protector by default.
 703   stackp-flag := $(call cc-option, -fno-stack-protector)
 704 endif
 705 endif
 706 KBUILD_CFLAGS += $(stackp-flag)
 707
 708 ifeq ($(cc-name),clang)
 709 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 710 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 711 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 712 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 713 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 714 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 715 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 716 # See modpost pattern 2
 717 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 718 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 719 else
 720
 721 # These warnings generated too much noise in a regular build.
 722 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 723 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 724 endif
 725
 726 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 727 ifdef CONFIG_FRAME_POINTER
 728 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 729 else
 730 # Some targets (ARM with Thumb2, for example), can't be built with frame
 731 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 732 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 733 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 734 # -fomit-frame-pointer with FUNCTION_TRACER.
 735 ifndef CONFIG_FUNCTION_TRACER
 736 KBUILD_CFLAGS   += -fomit-frame-pointer
 737 endif
 738 endif
 739
 740 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 741
 742 ifdef CONFIG_DEBUG_INFO
 743 ifdef CONFIG_DEBUG_INFO_SPLIT
 744 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 745 else
 746 KBUILD_CFLAGS   += -g
 747 endif
 748 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 749 endif
 750 ifdef CONFIG_DEBUG_INFO_DWARF4
 751 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 752 endif
 753
 754 ifdef CONFIG_DEBUG_INFO_REDUCED
 755 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 756                    $(call cc-option,-fno-var-tracking)
 757 endif
 758
 759 ifdef CONFIG_FUNCTION_TRACER
 760 ifndef CC_FLAGS_FTRACE
 761 CC_FLAGS_FTRACE := -pg
 762 endif
 763 export CC_FLAGS_FTRACE
 764 ifdef CONFIG_HAVE_FENTRY
 765 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 766 endif
 767 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 768 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 769 ifdef CONFIG_DYNAMIC_FTRACE
 770         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 771                 BUILD_C_RECORDMCOUNT := y
 772                 export BUILD_C_RECORDMCOUNT
 773         endif
 774 endif
 775 endif
 776
 777 # We trigger additional mismatches with less inlining
 778 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 779 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 780 endif
 781
 782 # arch Makefile may override CC so keep this after arch Makefile is included
 783 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 784 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 785
 786 # warn about C99 declaration after statement
 787 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 788
 789 # disable pointer signed / unsigned warnings in gcc 4.0
 790 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 791
 792 # disable stringop warnings in gcc 8+
 793 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 794
 795 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 796 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 797 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 798 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 799
 800 # Another good warning that we'll want to enable eventually
 801 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 802
 803 # Enabled with W=2, disabled by default as noisy
 804 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 805
 806 # disable invalid "can't wrap" optimizations for signed / pointers
 807 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 808
 809 # clang sets -fmerge-all-constants by default as optimization, but this
 810 # is non-conforming behavior for C and in fact breaks the kernel, so we
 811 # need to disable it here generally.
 812 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 813
 814 # for gcc -fno-merge-all-constants disables everything, but it is fine
 815 # to have actual conforming behavior enabled.
 816 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 817
 818 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 819 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 820
 821 # conserve stack if available
 822 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 823
 824 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 825 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 826
 827 # require functions to have arguments in prototypes, not empty 'int foo()'
 828 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 829
 830 # Prohibit date/time macros, which would make the build non-deterministic
 831 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 832
 833 # ensure -fcf-protection is disabled when using retpoline as it is
 834 # incompatible with -mindirect-branch=thunk-extern
 835 ifdef CONFIG_RETPOLINE
 836 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 837 endif
 838
 839 # use the deterministic mode of AR if available
 840 KBUILD_ARFLAGS := $(call ar-option,D)
 841
 842 include scripts/Makefile.kasan
 843 include scripts/Makefile.extrawarn
 844
 845 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 846 # last assignments
 847 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 848 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 849 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 850
 851 # Use --build-id when available.
 852 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 853                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 854 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 855 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 856
 857 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 858 LDFLAGS_vmlinux += $(call ld-option, -X,)
 859 endif
 860
 861 # Default kernel image to build when no specific target is given.
 862 # KBUILD_IMAGE may be overruled on the command line or
 863 # set in the environment
 864 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 865 # this default value
 866 export KBUILD_IMAGE ?= vmlinux
 867
 868 #
 869 # INSTALL_PATH specifies where to place the updated kernel and system map
 870 # images. Default is /boot, but you can set it to other values
 871 export  INSTALL_PATH ?= /boot
 872
 873 #
 874 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 875 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 876 # an argument if needed. Otherwise it defaults to the kernel install path
 877 #
 878 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 879
 880 #
 881 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 882 # relocations required by build roots.  This is not defined in the
 883 # makefile but the argument can be passed to make if needed.
 884 #
 885
 886 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 887 export MODLIB
 888
 889 #
 890 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 891 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 892 # the default option --strip-debug will be used.  Otherwise,
 893 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 894
 895 ifdef INSTALL_MOD_STRIP
 896 ifeq ($(INSTALL_MOD_STRIP),1)
 897 mod_strip_cmd = $(STRIP) --strip-debug
 898 else
 899 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 900 endif # INSTALL_MOD_STRIP=1
 901 else
 902 mod_strip_cmd = true
 903 endif # INSTALL_MOD_STRIP
 904 export mod_strip_cmd
 905
 906 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 907 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 908 # or CONFIG_MODULE_COMPRESS_XZ.
 909
 910 mod_compress_cmd = true
 911 ifdef CONFIG_MODULE_COMPRESS
 912   ifdef CONFIG_MODULE_COMPRESS_GZIP
 913     mod_compress_cmd = gzip -n -f
 914   endif # CONFIG_MODULE_COMPRESS_GZIP
 915   ifdef CONFIG_MODULE_COMPRESS_XZ
 916     mod_compress_cmd = xz -f
 917   endif # CONFIG_MODULE_COMPRESS_XZ
 918 endif # CONFIG_MODULE_COMPRESS
 919 export mod_compress_cmd
 920
 921 # Select initial ramdisk compression format, default is gzip(1).
 922 # This shall be used by the dracut(8) tool while creating an initramfs image.
 923 #
 924 INITRD_COMPRESS-y                  := gzip
 925 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 926 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 927 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 928 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 929 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 930 # do not export INITRD_COMPRESS, since we didn't actually
 931 # choose a sane default compression above.
 932 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 933
 934 ifdef CONFIG_MODULE_SIG_ALL
 935 $(eval $(call config_filename,MODULE_SIG_KEY))
 936
 937 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 938 else
 939 mod_sign_cmd = true
 940 endif
 941 export mod_sign_cmd
 942
 943
 944 ifeq ($(KBUILD_EXTMOD),)
 945 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 946
 947 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 948                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 949                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 950
 951 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 952                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 953
 954 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 955 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 956 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 957 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 958 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 959 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 960 libs-y          := $(libs-y1) $(libs-y2)
 961 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 962
 963 # Externally visible symbols (used by link-vmlinux.sh)
 964 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 965 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 966 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 967 export LDFLAGS_vmlinux
 968 # used by scripts/pacmage/Makefile
 969 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 970
 971 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 972
 973 # Final link of vmlinux
 974       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 975 quiet_cmd_link-vmlinux = LINK    $@
 976
 977 # Include targets which we want to
 978 # execute if the rest of the kernel build went well.
 979 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 980 ifdef CONFIG_HEADERS_CHECK
 981         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 982 endif
 983 ifdef CONFIG_SAMPLES
 984         $(Q)$(MAKE) $(build)=samples
 985 endif
 986 ifdef CONFIG_BUILD_DOCSRC
 987         $(Q)$(MAKE) $(build)=Documentation
 988 endif
 989 ifdef CONFIG_GDB_SCRIPTS
 990         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 991 endif
 992         +$(call if_changed,link-vmlinux)
 993
 994 # The actual objects are generated when descending,
 995 # make sure no implicit rule kicks in
 996 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 997
 998 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 999 # Preset locale variables to speed up the build process. Limit locale
1000 # tweaks to this spot to avoid wrong language settings when running
1001 # make menuconfig etc.
1002 # Error messages still appears in the original language
1003
1004 PHONY += $(vmlinux-dirs)
1005 $(vmlinux-dirs): prepare scripts
1006         $(Q)$(MAKE) $(build)=$@
1007
1008 define filechk_kernel.release
1009         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1010 endef
1011
1012 # Store (new) KERNELRELEASE string in include/config/kernel.release
1013 include/config/kernel.release: include/config/auto.conf FORCE
1014         $(call filechk,kernel.release)
1015
1016
1017 # Things we need to do before we recursively start building the kernel
1018 # or the modules are listed in "prepare".
1019 # A multi level approach is used. prepareN is processed before prepareN-1.
1020 # archprepare is used in arch Makefiles and when processed asm symlink,
1021 # version.h and scripts_basic is processed / created.
1022
1023 # Listed in dependency order
1024 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1025
1026 # prepare3 is used to check if we are building in a separate output directory,
1027 # and if so do:
1028 # 1) Check that make has not been executed in the kernel src $(srctree)
1029 prepare3: include/config/kernel.release
1030 ifneq ($(KBUILD_SRC),)
1031         @$(kecho) '  Using $(srctree) as source for kernel'
1032         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1033                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1034                 echo >&2 "  in the '$(srctree)' directory.";\
1035                 /bin/false; \
1036         fi;
1037 endif
1038
1039 # prepare2 creates a makefile if using a separate output directory
1040 prepare2: prepare3 outputmakefile asm-generic
1041
1042 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1043                    include/config/auto.conf
1044         $(cmd_crmodverdir)
1045
1046 archprepare: archheaders archscripts prepare1 scripts_basic
1047
1048 prepare0: archprepare FORCE
1049         $(Q)$(MAKE) $(build)=.
1050
1051 # All the preparing..
1052 prepare: prepare0
1053
1054 # Generate some files
1055 # ---------------------------------------------------------------------------
1056
1057 # KERNELRELEASE can change from a few different places, meaning version.h
1058 # needs to be updated, so this check is forced on all builds
1059
1060 uts_len := 64
1061 define filechk_utsrelease.h
1062         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1063           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1064           exit 1;                                                         \
1065         fi;                                                               \
1066         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1067 endef
1068
1069 define filechk_version.h
1070         (echo \#define LINUX_VERSION_CODE $(shell                         \
1071         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1072         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1073 endef
1074
1075 $(version_h): $(srctree)/Makefile FORCE
1076         $(call filechk,version.h)
1077         $(Q)rm -f $(old_version_h)
1078
1079 include/generated/utsrelease.h: include/config/kernel.release FORCE
1080         $(call filechk,utsrelease.h)
1081
1082 PHONY += headerdep
1083 headerdep:
1084         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1085         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1086
1087 # ---------------------------------------------------------------------------
1088 # Firmware install
1089 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1090 export INSTALL_FW_PATH
1091
1092 PHONY += firmware_install
1093 firmware_install: FORCE
1094         @mkdir -p $(objtree)/firmware
1095         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1096
1097 # ---------------------------------------------------------------------------
1098 # Kernel headers
1099
1100 #Default location for installed headers
1101 export INSTALL_HDR_PATH = $(objtree)/usr
1102
1103 # If we do an all arch process set dst to asm-$(hdr-arch)
1104 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1105
1106 PHONY += archheaders
1107 archheaders:
1108
1109 PHONY += archscripts
1110 archscripts:
1111
1112 PHONY += __headers
1113 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1114         $(Q)$(MAKE) $(build)=scripts build_unifdef
1115
1116 PHONY += headers_install_all
1117 headers_install_all:
1118         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1119
1120 PHONY += headers_install
1121 headers_install: __headers
1122         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1123           $(error Headers not exportable for the $(SRCARCH) architecture))
1124         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1125         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1126
1127 PHONY += headers_check_all
1128 headers_check_all: headers_install_all
1129         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1130
1131 PHONY += headers_check
1132 headers_check: headers_install
1133         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1134         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1135
1136 # ---------------------------------------------------------------------------
1137 # Kernel selftest
1138
1139 PHONY += kselftest
1140 kselftest:
1141         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1142
1143 kselftest-clean:
1144         $(Q)$(MAKE) -C tools/testing/selftests clean
1145
1146 # ---------------------------------------------------------------------------
1147 # Modules
1148
1149 ifdef CONFIG_MODULES
1150
1151 # By default, build modules as well
1152
1153 all: modules
1154
1155 # When we're building modules with modversions, we need to consider
1156 # the built-in objects during the descend as well, in order to
1157 # make sure the checksums are up to date before we record them.
1158 ifdef CONFIG_MODVERSIONS
1159   KBUILD_BUILTIN := 1
1160 endif
1161
1162 # Build modules
1163 #
1164 # A module can be listed more than once in obj-m resulting in
1165 # duplicate lines in modules.order files.  Those are removed
1166 # using awk while concatenating to the final file.
1167
1168 PHONY += modules
1169 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1170         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1171         @$(kecho) '  Building modules, stage 2.';
1172         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1173         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1174
1175 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1176         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1177
1178 %/modules.builtin: include/config/auto.conf
1179         $(Q)$(MAKE) $(modbuiltin)=$*
1180
1181
1182 # Target to prepare building external modules
1183 PHONY += modules_prepare
1184 modules_prepare: prepare scripts
1185
1186 # Target to install modules
1187 PHONY += modules_install
1188 modules_install: _modinst_ _modinst_post
1189
1190 PHONY += _modinst_
1191 _modinst_:
1192         @rm -rf $(MODLIB)/kernel
1193         @rm -f $(MODLIB)/source
1194         @mkdir -p $(MODLIB)/kernel
1195         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1196         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1197                 rm -f $(MODLIB)/build ; \
1198                 ln -s $(CURDIR) $(MODLIB)/build ; \
1199         fi
1200         @cp -f $(objtree)/modules.order $(MODLIB)/
1201         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1202         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1203
1204 # This depmod is only for convenience to give the initial
1205 # boot a modules.dep even before / is mounted read-write.  However the
1206 # boot script depmod is the master version.
1207 PHONY += _modinst_post
1208 _modinst_post: _modinst_
1209         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1210         $(call cmd,depmod)
1211
1212 ifeq ($(CONFIG_MODULE_SIG), y)
1213 PHONY += modules_sign
1214 modules_sign:
1215         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1216 endif
1217
1218 else # CONFIG_MODULES
1219
1220 # Modules not configured
1221 # ---------------------------------------------------------------------------
1222
1223 modules modules_install: FORCE
1224         @echo >&2
1225         @echo >&2 "The present kernel configuration has modules disabled."
1226         @echo >&2 "Type 'make config' and enable loadable module support."
1227         @echo >&2 "Then build a kernel with module support enabled."
1228         @echo >&2
1229         @exit 1
1230
1231 endif # CONFIG_MODULES
1232
1233 ###
1234 # Cleaning is done on three levels.
1235 # make clean     Delete most generated files
1236 #                Leave enough to build external modules
1237 # make mrproper  Delete the current configuration, and all generated files
1238 # make distclean Remove editor backup files, patch leftover files and the like
1239
1240 # Directories & files removed with 'make clean'
1241 CLEAN_DIRS  += $(MODVERDIR)
1242
1243 # Directories & files removed with 'make mrproper'
1244 MRPROPER_DIRS  += include/config usr/include include/generated          \
1245                   arch/*/include/generated .tmp_objdiff
1246 MRPROPER_FILES += .config .config.old .version .old_version \
1247                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1248                   signing_key.pem signing_key.priv signing_key.x509     \
1249                   x509.genkey extra_certificates signing_key.x509.keyid \
1250                   signing_key.x509.signer vmlinux-gdb.py
1251
1252 # clean - Delete most, but leave enough to build external modules
1253 #
1254 clean: rm-dirs  := $(CLEAN_DIRS)
1255 clean: rm-files := $(CLEAN_FILES)
1256 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1257
1258 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1259 $(clean-dirs):
1260         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1261
1262 vmlinuxclean:
1263         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1264
1265 clean: archclean vmlinuxclean
1266
1267 # mrproper - Delete all generated files, including .config
1268 #
1269 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1270 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1271 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1272
1273 PHONY += $(mrproper-dirs) mrproper archmrproper
1274 $(mrproper-dirs):
1275         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1276
1277 mrproper: clean archmrproper $(mrproper-dirs)
1278         $(call cmd,rmdirs)
1279         $(call cmd,rmfiles)
1280
1281 # distclean
1282 #
1283 PHONY += distclean
1284
1285 distclean: mrproper
1286         @find $(srctree) $(RCS_FIND_IGNORE) \
1287                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1288                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1289                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1290                 -type f -print | xargs rm -f
1291
1292
1293 # Packaging of the kernel to various formats
1294 # ---------------------------------------------------------------------------
1295 # rpm target kept for backward compatibility
1296 package-dir     := scripts/package
1297
1298 %src-pkg: FORCE
1299         $(Q)$(MAKE) $(build)=$(package-dir) $@
1300 %pkg: include/config/kernel.release FORCE
1301         $(Q)$(MAKE) $(build)=$(package-dir) $@
1302 rpm: include/config/kernel.release FORCE
1303         $(Q)$(MAKE) $(build)=$(package-dir) $@
1304
1305
1306 # Brief documentation of the typical targets used
1307 # ---------------------------------------------------------------------------
1308
1309 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1310 boards := $(sort $(notdir $(boards)))
1311 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1312 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1313
1314 help:
1315         @echo  'Cleaning targets:'
1316         @echo  '  clean           - Remove most generated files but keep the config and'
1317         @echo  '                    enough build support to build external modules'
1318         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1319         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1320         @echo  ''
1321         @echo  'Configuration targets:'
1322         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1323         @echo  ''
1324         @echo  'Other generic targets:'
1325         @echo  '  all             - Build all targets marked with [*]'
1326         @echo  '* vmlinux         - Build the bare kernel'
1327         @echo  '* modules         - Build all modules'
1328         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1329         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1330         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1331         @echo  '  dir/            - Build all files in dir and below'
1332         @echo  '  dir/file.[ois]  - Build specified target only'
1333         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1334         @echo  '                    (requires compiler support for LLVM assembly generation)'
1335         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1336         @echo  '                    (requires a recent binutils and recent build (System.map))'
1337         @echo  '  dir/file.ko     - Build module including final link'
1338         @echo  '  modules_prepare - Set up for building external modules'
1339         @echo  '  tags/TAGS       - Generate tags file for editors'
1340         @echo  '  cscope          - Generate cscope index'
1341         @echo  '  gtags           - Generate GNU GLOBAL index'
1342         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1343         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1344         @echo  '  image_name      - Output the image name (use with make -s)'
1345         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1346          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1347          echo  ''
1348         @echo  'Static analysers'
1349         @echo  '  checkstack      - Generate a list of stack hogs'
1350         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1351         @echo  '  versioncheck    - Sanity check on version.h usage'
1352         @echo  '  includecheck    - Check for duplicate included header files'
1353         @echo  '  export_report   - List the usages of all exported symbols'
1354         @echo  '  headers_check   - Sanity check on exported headers'
1355         @echo  '  headerdep       - Detect inclusion cycles in headers'
1356         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1357         @echo  ''
1358         @echo  'Kernel selftest'
1359         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1360         @echo  '                    Build, install, and boot kernel before'
1361         @echo  '                    running kselftest on it'
1362         @echo  '  kselftest-clean - Remove all generated kselftest files'
1363         @echo  ''
1364         @echo  'Kernel packaging:'
1365         @$(MAKE) $(build)=$(package-dir) help
1366         @echo  ''
1367         @echo  'Documentation targets:'
1368         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1369         @echo  ''
1370         @echo  'Architecture specific targets ($(SRCARCH)):'
1371         @$(if $(archhelp),$(archhelp),\
1372                 echo '  No architecture specific help defined for $(SRCARCH)')
1373         @echo  ''
1374         @$(if $(boards), \
1375                 $(foreach b, $(boards), \
1376                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1377                 echo '')
1378         @$(if $(board-dirs), \
1379                 $(foreach b, $(board-dirs), \
1380                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1381                 printf "  %-16s - Show all of the above\\n" help-boards; \
1382                 echo '')
1383
1384         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1385         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1386         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1387         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1388         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1389         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1390         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1391         @echo  '                1: warnings which may be relevant and do not occur too often'
1392         @echo  '                2: warnings which occur quite often but may still be relevant'
1393         @echo  '                3: more obscure warnings, can most likely be ignored'
1394         @echo  '                Multiple levels can be combined with W=12 or W=123'
1395         @echo  ''
1396         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1397         @echo  'For further info see the ./README file'
1398
1399
1400 help-board-dirs := $(addprefix help-,$(board-dirs))
1401
1402 help-boards: $(help-board-dirs)
1403
1404 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1405
1406 $(help-board-dirs): help-%:
1407         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1408         @$(if $(boards-per-dir), \
1409                 $(foreach b, $(boards-per-dir), \
1410                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1411                 echo '')
1412
1413
1414 # Documentation targets
1415 # ---------------------------------------------------------------------------
1416 %docs: scripts_basic FORCE
1417         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1418         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1419
1420 else # KBUILD_EXTMOD
1421
1422 ###
1423 # External module support.
1424 # When building external modules the kernel used as basis is considered
1425 # read-only, and no consistency checks are made and the make
1426 # system is not used on the basis kernel. If updates are required
1427 # in the basis kernel ordinary make commands (without M=...) must
1428 # be used.
1429 #
1430 # The following are the only valid targets when building external
1431 # modules.
1432 # make M=dir clean     Delete all automatically generated files
1433 # make M=dir modules   Make all modules in specified dir
1434 # make M=dir           Same as 'make M=dir modules'
1435 # make M=dir modules_install
1436 #                      Install the modules built in the module directory
1437 #                      Assumes install directory is already created
1438
1439 # We are always building modules
1440 KBUILD_MODULES := 1
1441
1442 PHONY += $(objtree)/Module.symvers
1443 $(objtree)/Module.symvers:
1444         @test -e $(objtree)/Module.symvers || ( \
1445         echo; \
1446         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1447         echo "           is missing; modules will have no dependencies and modversions."; \
1448         echo )
1449
1450 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1451 PHONY += $(module-dirs) modules
1452 $(module-dirs): prepare $(objtree)/Module.symvers
1453         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1454
1455 modules: $(module-dirs)
1456         @$(kecho) '  Building modules, stage 2.';
1457         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1458
1459 PHONY += modules_install
1460 modules_install: _emodinst_ _emodinst_post
1461
1462 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1463 PHONY += _emodinst_
1464 _emodinst_:
1465         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1466         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1467
1468 PHONY += _emodinst_post
1469 _emodinst_post: _emodinst_
1470         $(call cmd,depmod)
1471
1472 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1473
1474 PHONY += $(clean-dirs) clean
1475 $(clean-dirs):
1476         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1477
1478 clean:  rm-dirs := $(MODVERDIR)
1479 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1480
1481 help:
1482         @echo  '  Building external modules.'
1483         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1484         @echo  ''
1485         @echo  '  modules         - default target, build the module(s)'
1486         @echo  '  modules_install - install the module'
1487         @echo  '  clean           - remove generated files in module directory only'
1488         @echo  ''
1489
1490 # Dummies...
1491 PHONY += prepare scripts
1492 prepare:
1493         $(cmd_crmodverdir)
1494 scripts: ;
1495 endif # KBUILD_EXTMOD
1496
1497 clean: $(clean-dirs)
1498         $(call cmd,rmdirs)
1499         $(call cmd,rmfiles)
1500         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1501                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1502                 -o -name '*.ko.*' \
1503                 -o -name '*.dwo'  \
1504                 -o -name '*.su'  \
1505                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1506                 -o -name '*.symtypes' -o -name 'modules.order' \
1507                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1508                 -o -name '*.ll' \
1509                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1510
1511 # Generate tags for editors
1512 # ---------------------------------------------------------------------------
1513 quiet_cmd_tags = GEN     $@
1514       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1515
1516 tags TAGS cscope gtags: FORCE
1517         $(call cmd,tags)
1518
1519 # Scripts to check various things for consistency
1520 # ---------------------------------------------------------------------------
1521
1522 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1523
1524 includecheck:
1525         find $(srctree)/* $(RCS_FIND_IGNORE) \
1526                 -name '*.[hcS]' -type f -print | sort \
1527                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1528
1529 versioncheck:
1530         find $(srctree)/* $(RCS_FIND_IGNORE) \
1531                 -name '*.[hcS]' -type f -print | sort \
1532                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1533
1534 coccicheck:
1535         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1536
1537 namespacecheck:
1538         $(PERL) $(srctree)/scripts/namespace.pl
1539
1540 export_report:
1541         $(PERL) $(srctree)/scripts/export_report.pl
1542
1543 endif #ifeq ($(config-targets),1)
1544 endif #ifeq ($(mixed-targets),1)
1545
1546 PHONY += checkstack kernelrelease kernelversion image_name
1547
1548 # UML needs a little special treatment here.  It wants to use the host
1549 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1550 # else wants $(ARCH), including people doing cross-builds, which means
1551 # that $(SUBARCH) doesn't work here.
1552 ifeq ($(ARCH), um)
1553 CHECKSTACK_ARCH := $(SUBARCH)
1554 else
1555 CHECKSTACK_ARCH := $(ARCH)
1556 endif
1557 checkstack:
1558         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1559         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1560
1561 kernelrelease:
1562         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1563
1564 kernelversion:
1565         @echo $(KERNELVERSION)
1566
1567 image_name:
1568         @echo $(KBUILD_IMAGE)
1569
1570 # Clear a bunch of variables before executing the submake
1571 tools/: FORCE
1572         $(Q)mkdir -p $(objtree)/tools
1573         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1574
1575 tools/%: FORCE
1576         $(Q)mkdir -p $(objtree)/tools
1577         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1578
1579 # Single targets
1580 # ---------------------------------------------------------------------------
1581 # Single targets are compatible with:
1582 # - build with mixed source and output
1583 # - build with separate output dir 'make O=...'
1584 # - external modules
1585 #
1586 #  target-dir => where to store outputfile
1587 #  build-dir  => directory in kernel source tree to use
1588
1589 ifeq ($(KBUILD_EXTMOD),)
1590         build-dir  = $(patsubst %/,%,$(dir $@))
1591         target-dir = $(dir $@)
1592 else
1593         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1594         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1595         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1596 endif
1597
1598 %.s: %.c prepare scripts FORCE
1599         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1600 %.i: %.c prepare scripts FORCE
1601         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1602 %.o: %.c prepare scripts FORCE
1603         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1604 %.lst: %.c prepare scripts FORCE
1605         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1606 %.s: %.S prepare scripts FORCE
1607         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1608 %.o: %.S prepare scripts FORCE
1609         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1610 %.symtypes: %.c prepare scripts FORCE
1611         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1612 %.ll: %.c prepare scripts FORCE
1613         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1614
1615 # Modules
1616 /: prepare scripts FORCE
1617         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1618         $(build)=$(build-dir)
1619 # Make sure the latest headers are built for Documentation
1620 Documentation/: headers_install
1621 %/: prepare scripts FORCE
1622         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1623         $(build)=$(build-dir)
1624 %.ko: prepare scripts FORCE
1625         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1626         $(build)=$(build-dir) $(@:.ko=.o)
1627         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1628
1629 # FIXME Should go into a make.lib or something
1630 # ===========================================================================
1631
1632 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1633       cmd_rmdirs = rm -rf $(rm-dirs)
1634
1635 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1636       cmd_rmfiles = rm -f $(rm-files)
1637
1638 # Run depmod only if we have System.map and depmod is executable
1639 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1640       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1641                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1642
1643 # Create temporary dir for module support files
1644 # clean it up only when building all modules
1645 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1646                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1647
1648 # read all saved command lines
1649
1650 targets := $(wildcard $(sort $(targets)))
1651 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1652
1653 ifneq ($(cmd_files),)
1654   $(cmd_files): ;       # Do not try to update included dependency files
1655   include $(cmd_files)
1656 endif
1657
1658 endif   # skip-makefile
1659
1660 PHONY += FORCE
1661 FORCE:
1662
1663 # Declare the contents of the .PHONY variable as phony.  We keep that
1664 # information in a variable so we can use it in if_changed and friends.
1665 .PHONY: $(PHONY)