Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 9
   3 SUBLEVEL = 134
   4 EXTRAVERSION =
   5 NAME = Roaring Lionus
   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:
 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 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 310 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 311                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 312 endif
 313
 314 # Decide whether to build built-in, modular, or both.
 315 # Normally, just do built-in.
 316
 317 KBUILD_MODULES :=
 318 KBUILD_BUILTIN := 1
 319
 320 # If we have only "make modules", don't compile built-in objects.
 321 # When we're building modules with modversions, we need to consider
 322 # the built-in objects during the descend as well, in order to
 323 # make sure the checksums are up to date before we record them.
 324
 325 ifeq ($(MAKECMDGOALS),modules)
 326   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 327 endif
 328
 329 # If we have "make <whatever> modules", compile modules
 330 # in addition to whatever we do anyway.
 331 # Just "make" or "make all" shall build modules as well
 332
 333 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 334   KBUILD_MODULES := 1
 335 endif
 336
 337 ifeq ($(MAKECMDGOALS),)
 338   KBUILD_MODULES := 1
 339 endif
 340
 341 export KBUILD_MODULES KBUILD_BUILTIN
 342 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 343
 344 # We need some generic definitions (do not try to remake the file).
 345 scripts/Kbuild.include: ;
 346 include scripts/Kbuild.include
 347
 348 # Make variables (CC, etc...)
 349 AS              = $(CROSS_COMPILE)as
 350 LD              = $(CROSS_COMPILE)ld
 351 CC              = $(CROSS_COMPILE)gcc
 352 CPP             = $(CC) -E
 353 AR              = $(CROSS_COMPILE)ar
 354 NM              = $(CROSS_COMPILE)nm
 355 STRIP           = $(CROSS_COMPILE)strip
 356 OBJCOPY         = $(CROSS_COMPILE)objcopy
 357 OBJDUMP         = $(CROSS_COMPILE)objdump
 358 AWK             = awk
 359 GENKSYMS        = scripts/genksyms/genksyms
 360 INSTALLKERNEL  := installkernel
 361 DEPMOD          = /sbin/depmod
 362 PERL            = perl
 363 PYTHON          = python
 364 CHECK           = sparse
 365
 366 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 367                   -Wbitwise -Wno-return-void $(CF)
 368 NOSTDINC_FLAGS  =
 369 CFLAGS_MODULE   =
 370 AFLAGS_MODULE   =
 371 LDFLAGS_MODULE  =
 372 CFLAGS_KERNEL   =
 373 AFLAGS_KERNEL   =
 374 LDFLAGS_vmlinux =
 375
 376 # Use USERINCLUDE when you must reference the UAPI directories only.
 377 USERINCLUDE    := \
 378                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 379                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 380                 -I$(srctree)/include/uapi \
 381                 -I$(objtree)/include/generated/uapi \
 382                 -include $(srctree)/include/linux/kconfig.h
 383
 384 # Use LINUXINCLUDE when you must reference the include/ directory.
 385 # Needed to be compatible with the O= option
 386 LINUXINCLUDE    := \
 387                 -I$(srctree)/arch/$(hdr-arch)/include \
 388                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 389                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 390                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 391                 -I$(objtree)/include
 392
 393 LINUXINCLUDE    += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
 394
 395 KBUILD_AFLAGS   := -D__ASSEMBLY__
 396 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 397                    -fno-strict-aliasing -fno-common \
 398                    -Werror-implicit-function-declaration \
 399                    -Wno-format-security \
 400                    -std=gnu89
 401 KBUILD_CPPFLAGS := -D__KERNEL__
 402 KBUILD_AFLAGS_KERNEL :=
 403 KBUILD_CFLAGS_KERNEL :=
 404 KBUILD_AFLAGS_MODULE  := -DMODULE
 405 KBUILD_CFLAGS_MODULE  := -DMODULE
 406 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 407 GCC_PLUGINS_CFLAGS :=
 408
 409 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 410 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 411 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 412
 413 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 414 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 415 export CPP AR NM STRIP OBJCOPY OBJDUMP
 416 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 417 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 418
 419 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 420 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 421 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 422 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 423 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 424 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 425 export KBUILD_ARFLAGS
 426
 427 # When compiling out-of-tree modules, put MODVERDIR in the module
 428 # tree rather than in the kernel tree. The kernel tree might
 429 # even be read-only.
 430 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 431
 432 # Files to ignore in find ... statements
 433
 434 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 435                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 436                           -prune -o
 437 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 438                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 439
 440 # ===========================================================================
 441 # Rules shared between *config targets and build targets
 442
 443 # Basic helpers built in scripts/
 444 PHONY += scripts_basic
 445 scripts_basic:
 446         $(Q)$(MAKE) $(build)=scripts/basic
 447         $(Q)rm -f .tmp_quiet_recordmcount
 448
 449 # To avoid any implicit rule to kick in, define an empty command.
 450 scripts/basic/%: scripts_basic ;
 451
 452 PHONY += outputmakefile
 453 # outputmakefile generates a Makefile in the output directory, if using a
 454 # separate output directory. This allows convenient use of make in the
 455 # output directory.
 456 outputmakefile:
 457 ifneq ($(KBUILD_SRC),)
 458         $(Q)ln -fsn $(srctree) source
 459         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 460             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 461 endif
 462
 463 # Support for using generic headers in asm-generic
 464 PHONY += asm-generic
 465 asm-generic:
 466         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 467                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 468         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 469                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 470
 471 # To make sure we do not include .config for any of the *config targets
 472 # catch them early, and hand them over to scripts/kconfig/Makefile
 473 # It is allowed to specify more targets when calling make, including
 474 # mixing *config targets and build targets.
 475 # For example 'make oldconfig all'.
 476 # Detect when mixed targets is specified, and make a second invocation
 477 # of make so .config is not included in this case either (for *config).
 478
 479 version_h := include/generated/uapi/linux/version.h
 480 old_version_h := include/linux/version.h
 481
 482 no-dot-config-targets := clean mrproper distclean \
 483                          cscope gtags TAGS tags help% %docs check% coccicheck \
 484                          $(version_h) headers_% archheaders archscripts \
 485                          kernelversion %src-pkg
 486
 487 config-targets := 0
 488 mixed-targets  := 0
 489 dot-config     := 1
 490
 491 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 492         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 493                 dot-config := 0
 494         endif
 495 endif
 496
 497 ifeq ($(KBUILD_EXTMOD),)
 498         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 499                 config-targets := 1
 500                 ifneq ($(words $(MAKECMDGOALS)),1)
 501                         mixed-targets := 1
 502                 endif
 503         endif
 504 endif
 505 # install and module_install need also be processed one by one
 506 ifneq ($(filter install,$(MAKECMDGOALS)),)
 507         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 508                 mixed-targets := 1
 509         endif
 510 endif
 511
 512 ifeq ($(mixed-targets),1)
 513 # ===========================================================================
 514 # We're called with mixed targets (*config and build targets).
 515 # Handle them one by one.
 516
 517 PHONY += $(MAKECMDGOALS) __build_one_by_one
 518
 519 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 520         @:
 521
 522 __build_one_by_one:
 523         $(Q)set -e; \
 524         for i in $(MAKECMDGOALS); do \
 525                 $(MAKE) -f $(srctree)/Makefile $$i; \
 526         done
 527
 528 else
 529 ifeq ($(config-targets),1)
 530 # ===========================================================================
 531 # *config targets only - make sure prerequisites are updated, and descend
 532 # in scripts/kconfig to make the *config target
 533
 534 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 535 # KBUILD_DEFCONFIG may point out an alternative default configuration
 536 # used for 'make defconfig'
 537 include arch/$(SRCARCH)/Makefile
 538 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 539
 540 config: scripts_basic outputmakefile FORCE
 541         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 542
 543 %config: scripts_basic outputmakefile FORCE
 544         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 545
 546 else
 547 # ===========================================================================
 548 # Build targets only - this includes vmlinux, arch specific targets, clean
 549 # targets and others. In general all targets except *config targets.
 550
 551 ifeq ($(KBUILD_EXTMOD),)
 552 # Additional helpers built in scripts/
 553 # Carefully list dependencies so we do not try to build scripts twice
 554 # in parallel
 555 PHONY += scripts
 556 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 557          asm-generic gcc-plugins
 558         $(Q)$(MAKE) $(build)=$(@)
 559
 560 # Objects we will link into vmlinux / subdirs we need to visit
 561 init-y          := init/
 562 drivers-y       := drivers/ sound/ firmware/
 563 net-y           := net/
 564 libs-y          := lib/
 565 core-y          := usr/
 566 virt-y          := virt/
 567 endif # KBUILD_EXTMOD
 568
 569 ifeq ($(dot-config),1)
 570 # Read in config
 571 -include include/config/auto.conf
 572
 573 ifeq ($(KBUILD_EXTMOD),)
 574 # Read in dependencies to all Kconfig* files, make sure to run
 575 # oldconfig if changes are detected.
 576 -include include/config/auto.conf.cmd
 577
 578 # To avoid any implicit rule to kick in, define an empty command
 579 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 580
 581 # If .config is newer than include/config/auto.conf, someone tinkered
 582 # with it and forgot to run make oldconfig.
 583 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 584 # we execute the config step to be sure to catch updated Kconfig files
 585 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 586         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 587 else
 588 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 589 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 590 PHONY += include/config/auto.conf
 591
 592 include/config/auto.conf:
 593         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 594         echo >&2;                                                       \
 595         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 596         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 597         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 598         echo >&2 ;                                                      \
 599         /bin/false)
 600
 601 endif # KBUILD_EXTMOD
 602
 603 else
 604 # Dummy target needed, because used as prerequisite
 605 include/config/auto.conf: ;
 606 endif # $(dot-config)
 607
 608 # For the kernel to actually contain only the needed exported symbols,
 609 # we have to build modules as well to determine what those symbols are.
 610 # (this can be evaluated only once include/config/auto.conf has been included)
 611 ifdef CONFIG_TRIM_UNUSED_KSYMS
 612   KBUILD_MODULES := 1
 613 endif
 614
 615 # The all: target is the default when no target is given on the
 616 # command line.
 617 # This allow a user to issue only 'make' to build a kernel including modules
 618 # Defaults to vmlinux, but the arch makefile usually adds further targets
 619 all: vmlinux
 620
 621 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 622 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 623 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 624 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 625 export CFLAGS_GCOV CFLAGS_KCOV
 626
 627 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 628 # values of the respective KBUILD_* variables
 629 ARCH_CPPFLAGS :=
 630 ARCH_AFLAGS :=
 631 ARCH_CFLAGS :=
 632 include arch/$(SRCARCH)/Makefile
 633
 634 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 635 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 636 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 637 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 638 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 639 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 640
 641 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 642 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 643 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 644 endif
 645
 646 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 647 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 648 else
 649 ifdef CONFIG_PROFILE_ALL_BRANCHES
 650 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 651 else
 652 KBUILD_CFLAGS   += -O2
 653 endif
 654 endif
 655
 656 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 657                         $(call cc-disable-warning,maybe-uninitialized,))
 658
 659 # Tell gcc to never replace conditional load with a non-conditional one
 660 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 661
 662 # check for 'asm goto'
 663 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 664         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 665         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 666 endif
 667
 668 include scripts/Makefile.gcc-plugins
 669
 670 ifdef CONFIG_READABLE_ASM
 671 # Disable optimizations that make assembler listings hard to read.
 672 # reorder blocks reorders the control in the function
 673 # ipa clone creates specialized cloned functions
 674 # partial inlining inlines only parts of functions
 675 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 676                  $(call cc-option,-fno-ipa-cp-clone,) \
 677                  $(call cc-option,-fno-partial-inlining)
 678 endif
 679
 680 ifneq ($(CONFIG_FRAME_WARN),0)
 681 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 682 endif
 683
 684 # This selects the stack protector compiler flag. Testing it is delayed
 685 # until after .config has been reprocessed, in the prepare-compiler-check
 686 # target.
 687 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 688   stackp-flag := -fstack-protector
 689   stackp-name := REGULAR
 690 else
 691 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 692   stackp-flag := -fstack-protector-strong
 693   stackp-name := STRONG
 694 else
 695   # Force off for distro compilers that enable stack protector by default.
 696   stackp-flag := $(call cc-option, -fno-stack-protector)
 697 endif
 698 endif
 699 # Find arch-specific stack protector compiler sanity-checking script.
 700 ifdef CONFIG_CC_STACKPROTECTOR
 701   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 702   stackp-check := $(wildcard $(stackp-path))
 703 endif
 704 KBUILD_CFLAGS += $(stackp-flag)
 705
 706 ifeq ($(cc-name),clang)
 707 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 708 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 709 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 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.build)
 723 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 724 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 725 endif
 726
 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 invalid "can't wrap" optimizations for signed / pointers
 793 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 794
 795 # clang sets -fmerge-all-constants by default as optimization, but this
 796 # is non-conforming behavior for C and in fact breaks the kernel, so we
 797 # need to disable it here generally.
 798 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 799
 800 # for gcc -fno-merge-all-constants disables everything, but it is fine
 801 # to have actual conforming behavior enabled.
 802 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 803
 804 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 805 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 806
 807 # conserve stack if available
 808 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 809
 810 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 811 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 812
 813 # require functions to have arguments in prototypes, not empty 'int foo()'
 814 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 815
 816 # Prohibit date/time macros, which would make the build non-deterministic
 817 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 818
 819 # enforce correct pointer usage
 820 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 821
 822 # use the deterministic mode of AR if available
 823 KBUILD_ARFLAGS := $(call ar-option,D)
 824
 825 include scripts/Makefile.kasan
 826 include scripts/Makefile.extrawarn
 827 include scripts/Makefile.ubsan
 828
 829 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 830 # last assignments
 831 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 832 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 833 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 834
 835 # Use --build-id when available.
 836 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 837                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 838 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 839 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 840
 841 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 842 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 843 endif
 844
 845 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 846 LDFLAGS_vmlinux += $(call ld-option, -X,)
 847 endif
 848
 849 # Default kernel image to build when no specific target is given.
 850 # KBUILD_IMAGE may be overruled on the command line or
 851 # set in the environment
 852 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 853 # this default value
 854 export KBUILD_IMAGE ?= vmlinux
 855
 856 #
 857 # INSTALL_PATH specifies where to place the updated kernel and system map
 858 # images. Default is /boot, but you can set it to other values
 859 export  INSTALL_PATH ?= /boot
 860
 861 #
 862 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 863 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 864 # an argument if needed. Otherwise it defaults to the kernel install path
 865 #
 866 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 867
 868 #
 869 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 870 # relocations required by build roots.  This is not defined in the
 871 # makefile but the argument can be passed to make if needed.
 872 #
 873
 874 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 875 export MODLIB
 876
 877 #
 878 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 879 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 880 # the default option --strip-debug will be used.  Otherwise,
 881 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 882
 883 ifdef INSTALL_MOD_STRIP
 884 ifeq ($(INSTALL_MOD_STRIP),1)
 885 mod_strip_cmd = $(STRIP) --strip-debug
 886 else
 887 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 888 endif # INSTALL_MOD_STRIP=1
 889 else
 890 mod_strip_cmd = true
 891 endif # INSTALL_MOD_STRIP
 892 export mod_strip_cmd
 893
 894 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 895 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 896 # or CONFIG_MODULE_COMPRESS_XZ.
 897
 898 mod_compress_cmd = true
 899 ifdef CONFIG_MODULE_COMPRESS
 900   ifdef CONFIG_MODULE_COMPRESS_GZIP
 901     mod_compress_cmd = gzip -n -f
 902   endif # CONFIG_MODULE_COMPRESS_GZIP
 903   ifdef CONFIG_MODULE_COMPRESS_XZ
 904     mod_compress_cmd = xz -f
 905   endif # CONFIG_MODULE_COMPRESS_XZ
 906 endif # CONFIG_MODULE_COMPRESS
 907 export mod_compress_cmd
 908
 909 # Select initial ramdisk compression format, default is gzip(1).
 910 # This shall be used by the dracut(8) tool while creating an initramfs image.
 911 #
 912 INITRD_COMPRESS-y                  := gzip
 913 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 914 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 915 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 916 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 917 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 918 # do not export INITRD_COMPRESS, since we didn't actually
 919 # choose a sane default compression above.
 920 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 921
 922 ifdef CONFIG_MODULE_SIG_ALL
 923 $(eval $(call config_filename,MODULE_SIG_KEY))
 924
 925 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 926 else
 927 mod_sign_cmd = true
 928 endif
 929 export mod_sign_cmd
 930
 931
 932 ifeq ($(KBUILD_EXTMOD),)
 933 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 934
 935 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 936                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 937                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 938
 939 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 940                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 941
 942 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 943 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 944 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 945 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 946 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 947 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 948 libs-y          := $(libs-y1) $(libs-y2)
 949 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 950
 951 # Externally visible symbols (used by link-vmlinux.sh)
 952 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 953 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 954 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 955 export LDFLAGS_vmlinux
 956 # used by scripts/pacmage/Makefile
 957 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 958
 959 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 960
 961 # Include targets which we want to execute sequentially if the rest of the
 962 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 963 # evaluated more than once.
 964 PHONY += vmlinux_prereq
 965 vmlinux_prereq: $(vmlinux-deps) FORCE
 966 ifdef CONFIG_HEADERS_CHECK
 967         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 968 endif
 969 ifdef CONFIG_GDB_SCRIPTS
 970         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 971 endif
 972 ifdef CONFIG_TRIM_UNUSED_KSYMS
 973         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 974           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 975 endif
 976
 977 # standalone target for easier testing
 978 include/generated/autoksyms.h: FORCE
 979         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 980
 981 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 982
 983 # Final link of vmlinux with optional arch pass after final link
 984     cmd_link-vmlinux =                                                 \
 985         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
 986         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 987
 988 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
 989         +$(call if_changed,link-vmlinux)
 990
 991 # Build samples along the rest of the kernel
 992 ifdef CONFIG_SAMPLES
 993 vmlinux-dirs += samples
 994 endif
 995
 996 # The actual objects are generated when descending,
 997 # make sure no implicit rule kicks in
 998 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 999
1000 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1001 # Preset locale variables to speed up the build process. Limit locale
1002 # tweaks to this spot to avoid wrong language settings when running
1003 # make menuconfig etc.
1004 # Error messages still appears in the original language
1005
1006 PHONY += $(vmlinux-dirs)
1007 $(vmlinux-dirs): prepare scripts
1008         $(Q)$(MAKE) $(build)=$@
1009
1010 define filechk_kernel.release
1011         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1012 endef
1013
1014 # Store (new) KERNELRELEASE string in include/config/kernel.release
1015 include/config/kernel.release: include/config/auto.conf FORCE
1016         $(call filechk,kernel.release)
1017
1018
1019 # Things we need to do before we recursively start building the kernel
1020 # or the modules are listed in "prepare".
1021 # A multi level approach is used. prepareN is processed before prepareN-1.
1022 # archprepare is used in arch Makefiles and when processed asm symlink,
1023 # version.h and scripts_basic is processed / created.
1024
1025 # Listed in dependency order
1026 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1027
1028 # prepare3 is used to check if we are building in a separate output directory,
1029 # and if so do:
1030 # 1) Check that make has not been executed in the kernel src $(srctree)
1031 prepare3: include/config/kernel.release
1032 ifneq ($(KBUILD_SRC),)
1033         @$(kecho) '  Using $(srctree) as source for kernel'
1034         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1035                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1036                 echo >&2 "  in the '$(srctree)' directory.";\
1037                 /bin/false; \
1038         fi;
1039 endif
1040
1041 # prepare2 creates a makefile if using a separate output directory.
1042 # From this point forward, .config has been reprocessed, so any rules
1043 # that need to depend on updated CONFIG_* values can be checked here.
1044 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1045
1046 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1047                    include/config/auto.conf
1048         $(cmd_crmodverdir)
1049
1050 archprepare: archheaders archscripts prepare1 scripts_basic
1051
1052 prepare0: archprepare gcc-plugins
1053         $(Q)$(MAKE) $(build)=.
1054
1055 # All the preparing..
1056 prepare: prepare0 prepare-objtool
1057
1058 ifdef CONFIG_STACK_VALIDATION
1059   has_libelf := $(call try-run,\
1060                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1061   ifeq ($(has_libelf),1)
1062     objtool_target := tools/objtool FORCE
1063   else
1064     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1065     SKIP_STACK_VALIDATION := 1
1066     export SKIP_STACK_VALIDATION
1067   endif
1068 endif
1069
1070 PHONY += prepare-objtool
1071 prepare-objtool: $(objtool_target)
1072
1073 # Check for CONFIG flags that require compiler support. Abort the build
1074 # after .config has been processed, but before the kernel build starts.
1075 #
1076 # For security-sensitive CONFIG options, we don't want to fallback and/or
1077 # silently change which compiler flags will be used, since that leads to
1078 # producing kernels with different security feature characteristics
1079 # depending on the compiler used. (For example, "But I selected
1080 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1081 PHONY += prepare-compiler-check
1082 prepare-compiler-check: FORCE
1083 # Make sure compiler supports requested stack protector flag.
1084 ifdef stackp-name
1085   ifeq ($(call cc-option, $(stackp-flag)),)
1086         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1087                   $(stackp-flag) not supported by compiler >&2 && exit 1
1088   endif
1089 endif
1090 # Make sure compiler does not have buggy stack-protector support.
1091 ifdef stackp-check
1092   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1093         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1094                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1095   endif
1096 endif
1097         @:
1098
1099 # Generate some files
1100 # ---------------------------------------------------------------------------
1101
1102 # KERNELRELEASE can change from a few different places, meaning version.h
1103 # needs to be updated, so this check is forced on all builds
1104
1105 uts_len := 64
1106 define filechk_utsrelease.h
1107         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1108           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1109           exit 1;                                                         \
1110         fi;                                                               \
1111         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1112 endef
1113
1114 define filechk_version.h
1115         (echo \#define LINUX_VERSION_CODE $(shell                         \
1116         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1117         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1118 endef
1119
1120 $(version_h): $(srctree)/Makefile FORCE
1121         $(call filechk,version.h)
1122         $(Q)rm -f $(old_version_h)
1123
1124 include/generated/utsrelease.h: include/config/kernel.release FORCE
1125         $(call filechk,utsrelease.h)
1126
1127 PHONY += headerdep
1128 headerdep:
1129         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1130         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1131
1132 # ---------------------------------------------------------------------------
1133 # Firmware install
1134 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1135 export INSTALL_FW_PATH
1136
1137 PHONY += firmware_install
1138 firmware_install:
1139         @mkdir -p $(objtree)/firmware
1140         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1141
1142 # ---------------------------------------------------------------------------
1143 # Kernel headers
1144
1145 #Default location for installed headers
1146 export INSTALL_HDR_PATH = $(objtree)/usr
1147
1148 # If we do an all arch process set dst to asm-$(hdr-arch)
1149 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1150
1151 PHONY += archheaders
1152 archheaders:
1153
1154 PHONY += archscripts
1155 archscripts:
1156
1157 PHONY += __headers
1158 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1159         $(Q)$(MAKE) $(build)=scripts build_unifdef
1160
1161 PHONY += headers_install_all
1162 headers_install_all:
1163         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1164
1165 PHONY += headers_install
1166 headers_install: __headers
1167         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1168           $(error Headers not exportable for the $(SRCARCH) architecture))
1169         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1170         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1171
1172 PHONY += headers_check_all
1173 headers_check_all: headers_install_all
1174         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1175
1176 PHONY += headers_check
1177 headers_check: headers_install
1178         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1179         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1180
1181 # ---------------------------------------------------------------------------
1182 # Kernel selftest
1183
1184 PHONY += kselftest
1185 kselftest:
1186         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1187
1188 kselftest-clean:
1189         $(Q)$(MAKE) -C tools/testing/selftests clean
1190
1191 PHONY += kselftest-merge
1192 kselftest-merge:
1193         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1194         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1195                 -m $(objtree)/.config \
1196                 $(srctree)/tools/testing/selftests/*/config
1197         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1198
1199 # ---------------------------------------------------------------------------
1200 # Modules
1201
1202 ifdef CONFIG_MODULES
1203
1204 # By default, build modules as well
1205
1206 all: modules
1207
1208 # Build modules
1209 #
1210 # A module can be listed more than once in obj-m resulting in
1211 # duplicate lines in modules.order files.  Those are removed
1212 # using awk while concatenating to the final file.
1213
1214 PHONY += modules
1215 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1216         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1217         @$(kecho) '  Building modules, stage 2.';
1218         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1219         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1220
1221 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1222         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1223
1224 %/modules.builtin: include/config/auto.conf
1225         $(Q)$(MAKE) $(modbuiltin)=$*
1226
1227
1228 # Target to prepare building external modules
1229 PHONY += modules_prepare
1230 modules_prepare: prepare scripts
1231
1232 # Target to install modules
1233 PHONY += modules_install
1234 modules_install: _modinst_ _modinst_post
1235
1236 PHONY += _modinst_
1237 _modinst_:
1238         @rm -rf $(MODLIB)/kernel
1239         @rm -f $(MODLIB)/source
1240         @mkdir -p $(MODLIB)/kernel
1241         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1242         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1243                 rm -f $(MODLIB)/build ; \
1244                 ln -s $(CURDIR) $(MODLIB)/build ; \
1245         fi
1246         @cp -f $(objtree)/modules.order $(MODLIB)/
1247         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1248         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1249
1250 # This depmod is only for convenience to give the initial
1251 # boot a modules.dep even before / is mounted read-write.  However the
1252 # boot script depmod is the master version.
1253 PHONY += _modinst_post
1254 _modinst_post: _modinst_
1255         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1256         $(call cmd,depmod)
1257
1258 ifeq ($(CONFIG_MODULE_SIG), y)
1259 PHONY += modules_sign
1260 modules_sign:
1261         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1262 endif
1263
1264 else # CONFIG_MODULES
1265
1266 # Modules not configured
1267 # ---------------------------------------------------------------------------
1268
1269 PHONY += modules modules_install
1270 modules modules_install:
1271         @echo >&2
1272         @echo >&2 "The present kernel configuration has modules disabled."
1273         @echo >&2 "Type 'make config' and enable loadable module support."
1274         @echo >&2 "Then build a kernel with module support enabled."
1275         @echo >&2
1276         @exit 1
1277
1278 endif # CONFIG_MODULES
1279
1280 ###
1281 # Cleaning is done on three levels.
1282 # make clean     Delete most generated files
1283 #                Leave enough to build external modules
1284 # make mrproper  Delete the current configuration, and all generated files
1285 # make distclean Remove editor backup files, patch leftover files and the like
1286
1287 # Directories & files removed with 'make clean'
1288 CLEAN_DIRS  += $(MODVERDIR)
1289
1290 # Directories & files removed with 'make mrproper'
1291 MRPROPER_DIRS  += include/config usr/include include/generated          \
1292                   arch/*/include/generated .tmp_objdiff
1293 MRPROPER_FILES += .config .config.old .version .old_version \
1294                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1295                   signing_key.pem signing_key.priv signing_key.x509     \
1296                   x509.genkey extra_certificates signing_key.x509.keyid \
1297                   signing_key.x509.signer vmlinux-gdb.py
1298
1299 # clean - Delete most, but leave enough to build external modules
1300 #
1301 clean: rm-dirs  := $(CLEAN_DIRS)
1302 clean: rm-files := $(CLEAN_FILES)
1303 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1304
1305 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1306 $(clean-dirs):
1307         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1308
1309 vmlinuxclean:
1310         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1311         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1312
1313 clean: archclean vmlinuxclean
1314
1315 # mrproper - Delete all generated files, including .config
1316 #
1317 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1318 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1319 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1320
1321 PHONY += $(mrproper-dirs) mrproper archmrproper
1322 $(mrproper-dirs):
1323         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1324
1325 mrproper: clean archmrproper $(mrproper-dirs)
1326         $(call cmd,rmdirs)
1327         $(call cmd,rmfiles)
1328
1329 # distclean
1330 #
1331 PHONY += distclean
1332
1333 distclean: mrproper
1334         @find $(srctree) $(RCS_FIND_IGNORE) \
1335                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1336                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1337                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1338                 -type f -print | xargs rm -f
1339
1340
1341 # Packaging of the kernel to various formats
1342 # ---------------------------------------------------------------------------
1343 # rpm target kept for backward compatibility
1344 package-dir     := scripts/package
1345
1346 %src-pkg: FORCE
1347         $(Q)$(MAKE) $(build)=$(package-dir) $@
1348 %pkg: include/config/kernel.release FORCE
1349         $(Q)$(MAKE) $(build)=$(package-dir) $@
1350 rpm: include/config/kernel.release FORCE
1351         $(Q)$(MAKE) $(build)=$(package-dir) $@
1352
1353
1354 # Brief documentation of the typical targets used
1355 # ---------------------------------------------------------------------------
1356
1357 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1358 boards := $(sort $(notdir $(boards)))
1359 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1360 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1361
1362 PHONY += help
1363 help:
1364         @echo  'Cleaning targets:'
1365         @echo  '  clean           - Remove most generated files but keep the config and'
1366         @echo  '                    enough build support to build external modules'
1367         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1368         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1369         @echo  ''
1370         @echo  'Configuration targets:'
1371         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1372         @echo  ''
1373         @echo  'Other generic targets:'
1374         @echo  '  all             - Build all targets marked with [*]'
1375         @echo  '* vmlinux         - Build the bare kernel'
1376         @echo  '* modules         - Build all modules'
1377         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1378         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1379         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1380         @echo  '  dir/            - Build all files in dir and below'
1381         @echo  '  dir/file.[ois]  - Build specified target only'
1382         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1383         @echo  '                    (requires a recent binutils and recent build (System.map))'
1384         @echo  '  dir/file.ko     - Build module including final link'
1385         @echo  '  modules_prepare - Set up for building external modules'
1386         @echo  '  tags/TAGS       - Generate tags file for editors'
1387         @echo  '  cscope          - Generate cscope index'
1388         @echo  '  gtags           - Generate GNU GLOBAL index'
1389         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1390         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1391         @echo  '  image_name      - Output the image name (use with make -s)'
1392         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1393          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1394          echo  ''
1395         @echo  'Static analysers'
1396         @echo  '  checkstack      - Generate a list of stack hogs'
1397         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1398         @echo  '  versioncheck    - Sanity check on version.h usage'
1399         @echo  '  includecheck    - Check for duplicate included header files'
1400         @echo  '  export_report   - List the usages of all exported symbols'
1401         @echo  '  headers_check   - Sanity check on exported headers'
1402         @echo  '  headerdep       - Detect inclusion cycles in headers'
1403         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1404         @echo  ''
1405         @echo  'Kernel selftest'
1406         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1407         @echo  '                    Build, install, and boot kernel before'
1408         @echo  '                    running kselftest on it'
1409         @echo  '  kselftest-clean - Remove all generated kselftest files'
1410         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1411         @echo  '                    .config.'
1412         @echo  ''
1413         @echo  'Kernel packaging:'
1414         @$(MAKE) $(build)=$(package-dir) help
1415         @echo  ''
1416         @echo  'Documentation targets:'
1417         @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1418         @echo  ''
1419         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1420         @echo  ''
1421         @echo  'Architecture specific targets ($(SRCARCH)):'
1422         @$(if $(archhelp),$(archhelp),\
1423                 echo '  No architecture specific help defined for $(SRCARCH)')
1424         @echo  ''
1425         @$(if $(boards), \
1426                 $(foreach b, $(boards), \
1427                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1428                 echo '')
1429         @$(if $(board-dirs), \
1430                 $(foreach b, $(board-dirs), \
1431                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1432                 printf "  %-16s - Show all of the above\\n" help-boards; \
1433                 echo '')
1434
1435         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1436         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1437         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1438         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1439         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1440         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1441         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1442         @echo  '                1: warnings which may be relevant and do not occur too often'
1443         @echo  '                2: warnings which occur quite often but may still be relevant'
1444         @echo  '                3: more obscure warnings, can most likely be ignored'
1445         @echo  '                Multiple levels can be combined with W=12 or W=123'
1446         @echo  ''
1447         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1448         @echo  'For further info see the ./README file'
1449
1450
1451 help-board-dirs := $(addprefix help-,$(board-dirs))
1452
1453 help-boards: $(help-board-dirs)
1454
1455 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1456
1457 $(help-board-dirs): help-%:
1458         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1459         @$(if $(boards-per-dir), \
1460                 $(foreach b, $(boards-per-dir), \
1461                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1462                 echo '')
1463
1464
1465 # Documentation targets
1466 # ---------------------------------------------------------------------------
1467 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1468 PHONY += $(DOC_TARGETS)
1469 $(DOC_TARGETS): scripts_basic FORCE
1470         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1471         $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1472         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1473
1474 else # KBUILD_EXTMOD
1475
1476 ###
1477 # External module support.
1478 # When building external modules the kernel used as basis is considered
1479 # read-only, and no consistency checks are made and the make
1480 # system is not used on the basis kernel. If updates are required
1481 # in the basis kernel ordinary make commands (without M=...) must
1482 # be used.
1483 #
1484 # The following are the only valid targets when building external
1485 # modules.
1486 # make M=dir clean     Delete all automatically generated files
1487 # make M=dir modules   Make all modules in specified dir
1488 # make M=dir           Same as 'make M=dir modules'
1489 # make M=dir modules_install
1490 #                      Install the modules built in the module directory
1491 #                      Assumes install directory is already created
1492
1493 # We are always building modules
1494 KBUILD_MODULES := 1
1495 PHONY += crmodverdir
1496 crmodverdir:
1497         $(cmd_crmodverdir)
1498
1499 PHONY += $(objtree)/Module.symvers
1500 $(objtree)/Module.symvers:
1501         @test -e $(objtree)/Module.symvers || ( \
1502         echo; \
1503         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1504         echo "           is missing; modules will have no dependencies and modversions."; \
1505         echo )
1506
1507 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1508 PHONY += $(module-dirs) modules
1509 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1510         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1511
1512 modules: $(module-dirs)
1513         @$(kecho) '  Building modules, stage 2.';
1514         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1515
1516 PHONY += modules_install
1517 modules_install: _emodinst_ _emodinst_post
1518
1519 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1520 PHONY += _emodinst_
1521 _emodinst_:
1522         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1523         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1524
1525 PHONY += _emodinst_post
1526 _emodinst_post: _emodinst_
1527         $(call cmd,depmod)
1528
1529 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1530
1531 PHONY += $(clean-dirs) clean
1532 $(clean-dirs):
1533         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1534
1535 clean:  rm-dirs := $(MODVERDIR)
1536 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1537
1538 PHONY += help
1539 help:
1540         @echo  '  Building external modules.'
1541         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1542         @echo  ''
1543         @echo  '  modules         - default target, build the module(s)'
1544         @echo  '  modules_install - install the module'
1545         @echo  '  clean           - remove generated files in module directory only'
1546         @echo  ''
1547
1548 # Dummies...
1549 PHONY += prepare scripts
1550 prepare: ;
1551 scripts: ;
1552 endif # KBUILD_EXTMOD
1553
1554 clean: $(clean-dirs)
1555         $(call cmd,rmdirs)
1556         $(call cmd,rmfiles)
1557         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1558                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1559                 -o -name '*.ko.*' \
1560                 -o -name '*.dwo'  \
1561                 -o -name '*.su'  \
1562                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1563                 -o -name '*.symtypes' -o -name 'modules.order' \
1564                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1565                 -o -name '*.c.[012]*.*' \
1566                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1567
1568 # Generate tags for editors
1569 # ---------------------------------------------------------------------------
1570 quiet_cmd_tags = GEN     $@
1571       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1572
1573 tags TAGS cscope gtags: FORCE
1574         $(call cmd,tags)
1575
1576 # Scripts to check various things for consistency
1577 # ---------------------------------------------------------------------------
1578
1579 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1580
1581 includecheck:
1582         find $(srctree)/* $(RCS_FIND_IGNORE) \
1583                 -name '*.[hcS]' -type f -print | sort \
1584                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1585
1586 versioncheck:
1587         find $(srctree)/* $(RCS_FIND_IGNORE) \
1588                 -name '*.[hcS]' -type f -print | sort \
1589                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1590
1591 coccicheck:
1592         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1593
1594 namespacecheck:
1595         $(PERL) $(srctree)/scripts/namespace.pl
1596
1597 export_report:
1598         $(PERL) $(srctree)/scripts/export_report.pl
1599
1600 endif #ifeq ($(config-targets),1)
1601 endif #ifeq ($(mixed-targets),1)
1602
1603 PHONY += checkstack kernelrelease kernelversion image_name
1604
1605 # UML needs a little special treatment here.  It wants to use the host
1606 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1607 # else wants $(ARCH), including people doing cross-builds, which means
1608 # that $(SUBARCH) doesn't work here.
1609 ifeq ($(ARCH), um)
1610 CHECKSTACK_ARCH := $(SUBARCH)
1611 else
1612 CHECKSTACK_ARCH := $(ARCH)
1613 endif
1614 checkstack:
1615         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1616         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1617
1618 kernelrelease:
1619         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1620
1621 kernelversion:
1622         @echo $(KERNELVERSION)
1623
1624 image_name:
1625         @echo $(KBUILD_IMAGE)
1626
1627 # Clear a bunch of variables before executing the submake
1628 tools/: FORCE
1629         $(Q)mkdir -p $(objtree)/tools
1630         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1631
1632 tools/%: FORCE
1633         $(Q)mkdir -p $(objtree)/tools
1634         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1635
1636 # Single targets
1637 # ---------------------------------------------------------------------------
1638 # Single targets are compatible with:
1639 # - build with mixed source and output
1640 # - build with separate output dir 'make O=...'
1641 # - external modules
1642 #
1643 #  target-dir => where to store outputfile
1644 #  build-dir  => directory in kernel source tree to use
1645
1646 ifeq ($(KBUILD_EXTMOD),)
1647         build-dir  = $(patsubst %/,%,$(dir $@))
1648         target-dir = $(dir $@)
1649 else
1650         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1651         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1652         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1653 endif
1654
1655 %.s: %.c prepare scripts FORCE
1656         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1657 %.i: %.c prepare scripts FORCE
1658         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1659 %.o: %.c prepare scripts FORCE
1660         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1661 %.lst: %.c prepare scripts FORCE
1662         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1663 %.s: %.S prepare scripts FORCE
1664         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1665 %.o: %.S prepare scripts FORCE
1666         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1667 %.symtypes: %.c prepare scripts FORCE
1668         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1669
1670 # Modules
1671 /: prepare scripts FORCE
1672         $(cmd_crmodverdir)
1673         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1674         $(build)=$(build-dir)
1675 # Make sure the latest headers are built for Documentation
1676 Documentation/ samples/: headers_install
1677 %/: prepare scripts FORCE
1678         $(cmd_crmodverdir)
1679         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1680         $(build)=$(build-dir)
1681 %.ko: prepare scripts FORCE
1682         $(cmd_crmodverdir)
1683         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1684         $(build)=$(build-dir) $(@:.ko=.o)
1685         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1686
1687 # FIXME Should go into a make.lib or something
1688 # ===========================================================================
1689
1690 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1691       cmd_rmdirs = rm -rf $(rm-dirs)
1692
1693 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1694       cmd_rmfiles = rm -f $(rm-files)
1695
1696 # Run depmod only if we have System.map and depmod is executable
1697 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1698       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1699                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1700
1701 # Create temporary dir for module support files
1702 # clean it up only when building all modules
1703 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1704                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1705
1706 # read all saved command lines
1707
1708 targets := $(wildcard $(sort $(targets)))
1709 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1710
1711 ifneq ($(cmd_files),)
1712   $(cmd_files): ;       # Do not try to update included dependency files
1713   include $(cmd_files)
1714 endif
1715
1716 endif   # skip-makefile
1717
1718 PHONY += FORCE
1719 FORCE:
1720
1721 # Declare the contents of the .PHONY variable as phony.  We keep that
1722 # information in a variable so we can use it in if_changed and friends.
1723 .PHONY: $(PHONY)