Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 14
   4 SUBLEVEL = 8
   5 EXTRAVERSION =
   6 NAME = Petit Gorille
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # o Do not use make's built-in rules and variables
  15 #   (this increases performance and avoids hard-to-debug behaviour);
  16 # o Look for make include files relative to root of kernel src
  17 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  18
  19 # Avoid funny character set dependencies
  20 unexport LC_ALL
  21 LC_COLLATE=C
  22 LC_NUMERIC=C
  23 export LC_COLLATE LC_NUMERIC
  24
  25 # Avoid interference with shell env settings
  26 unexport GREP_OPTIONS
  27
  28 # We are using a recursive build, so we need to do a little thinking
  29 # to get the ordering right.
  30 #
  31 # Most importantly: sub-Makefiles should only ever modify files in
  32 # their own directory. If in some directory we have a dependency on
  33 # a file in another dir (which doesn't happen often, but it's often
  34 # unavoidable when linking the built-in.o targets which finally
  35 # turn into vmlinux), we will call a sub make in that other dir, and
  36 # after that we are sure that everything which is in that other dir
  37 # is now up to date.
  38 #
  39 # The only cases where we need to modify files which have global
  40 # effects are thus separated out and done before the recursive
  41 # descending is started. They are now explicitly listed as the
  42 # prepare rule.
  43
  44 # Beautify output
  45 # ---------------------------------------------------------------------------
  46 #
  47 # Normally, we echo the whole command before executing it. By making
  48 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  49 # $(quiet) to choose other forms of output instead, e.g.
  50 #
  51 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  52 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  53 #
  54 # If $(quiet) is empty, the whole command will be printed.
  55 # If it is set to "quiet_", only the short version will be printed.
  56 # If it is set to "silent_", nothing will be printed at all, since
  57 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  58 #
  59 # A simple variant is to prefix commands with $(Q) - that's useful
  60 # for commands that shall be hidden in non-verbose mode.
  61 #
  62 #       $(Q)ln $@ :<
  63 #
  64 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  65 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  66 #
  67 # To put more focus on warnings, be less verbose as default
  68 # Use 'make V=1' to see the full commands
  69
  70 ifeq ("$(origin V)", "command line")
  71   KBUILD_VERBOSE = $(V)
  72 endif
  73 ifndef KBUILD_VERBOSE
  74   KBUILD_VERBOSE = 0
  75 endif
  76
  77 ifeq ($(KBUILD_VERBOSE),1)
  78   quiet =
  79   Q =
  80 else
  81   quiet=quiet_
  82   Q = @
  83 endif
  84
  85 # If the user is running make -s (silent mode), suppress echoing of
  86 # commands
  87
  88 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  89   quiet=silent_
  90   tools_silent=s
  91 endif
  92
  93 export quiet Q KBUILD_VERBOSE
  94
  95 # kbuild supports saving output files in a separate directory.
  96 # To locate output files in a separate directory two syntaxes are supported.
  97 # In both cases the working directory must be the root of the kernel src.
  98 # 1) O=
  99 # Use "make O=dir/to/store/output/files/"
 100 #
 101 # 2) Set KBUILD_OUTPUT
 102 # Set the environment variable KBUILD_OUTPUT to point to the directory
 103 # where the output files shall be placed.
 104 # export KBUILD_OUTPUT=dir/to/store/output/files/
 105 # make
 106 #
 107 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 108 # variable.
 109
 110 # KBUILD_SRC is not intended to be used by the regular user (for now),
 111 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 112 ifeq ($(KBUILD_SRC),)
 113
 114 # OK, Make called in directory where kernel src resides
 115 # Do we want to locate output files in a separate directory?
 116 ifeq ("$(origin O)", "command line")
 117   KBUILD_OUTPUT := $(O)
 118 endif
 119
 120 # That's our default target when none is given on the command line
 121 PHONY := _all
 122 _all:
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && /bin/pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Use make M=dir to specify directory of external module to build
 180 # Old syntax make ... SUBDIRS=$PWD is still supported
 181 # Setting the environment variable KBUILD_EXTMOD take precedence
 182 ifdef SUBDIRS
 183   KBUILD_EXTMOD ?= $(SUBDIRS)
 184 endif
 185
 186 ifeq ("$(origin M)", "command line")
 187   KBUILD_EXTMOD := $(M)
 188 endif
 189
 190 # If building an external module we do not care about the all: rule
 191 # but instead _all depend on modules
 192 PHONY += all
 193 ifeq ($(KBUILD_EXTMOD),)
 194 _all: all
 195 else
 196 _all: modules
 197 endif
 198
 199 ifeq ($(KBUILD_SRC),)
 200         # building in the source tree
 201         srctree := .
 202 else
 203         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 204                 # building in a subdirectory of the source tree
 205                 srctree := ..
 206         else
 207                 srctree := $(KBUILD_SRC)
 208         endif
 209 endif
 210 objtree         := .
 211 src             := $(srctree)
 212 obj             := $(objtree)
 213
 214 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 215
 216 export srctree objtree VPATH
 217
 218 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 219 # first, and if a usermode build is happening, the "ARCH=um" on the command
 220 # line overrides the setting of ARCH below.  If a native build is happening,
 221 # then ARCH is assigned, getting whatever value it gets normally, and
 222 # SUBARCH is subsequently ignored.
 223
 224 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 225                                   -e s/sun4u/sparc64/ \
 226                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 227                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 228                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 229                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 230
 231 # Cross compiling and selecting different set of gcc/bin-utils
 232 # ---------------------------------------------------------------------------
 233 #
 234 # When performing cross compilation for other architectures ARCH shall be set
 235 # to the target architecture. (See arch/* for the possibilities).
 236 # ARCH can be set during invocation of make:
 237 # make ARCH=ia64
 238 # Another way is to have ARCH set in the environment.
 239 # The default ARCH is the host where make is executed.
 240
 241 # CROSS_COMPILE specify the prefix used for all executables used
 242 # during compilation. Only gcc and related bin-utils executables
 243 # are prefixed with $(CROSS_COMPILE).
 244 # CROSS_COMPILE can be set on the command line
 245 # make CROSS_COMPILE=ia64-linux-
 246 # Alternatively CROSS_COMPILE can be set in the environment.
 247 # A third alternative is to store a setting in .config so that plain
 248 # "make" in the configured kernel build directory always uses that.
 249 # Default value for CROSS_COMPILE is not to prefix executables
 250 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 251 ARCH            ?= $(SUBARCH)
 252 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 253
 254 # Architecture as present in compile.h
 255 UTS_MACHINE     := $(ARCH)
 256 SRCARCH         := $(ARCH)
 257
 258 # Additional ARCH settings for x86
 259 ifeq ($(ARCH),i386)
 260         SRCARCH := x86
 261 endif
 262 ifeq ($(ARCH),x86_64)
 263         SRCARCH := x86
 264 endif
 265
 266 # Additional ARCH settings for sparc
 267 ifeq ($(ARCH),sparc32)
 268        SRCARCH := sparc
 269 endif
 270 ifeq ($(ARCH),sparc64)
 271        SRCARCH := sparc
 272 endif
 273
 274 # Additional ARCH settings for sh
 275 ifeq ($(ARCH),sh64)
 276        SRCARCH := sh
 277 endif
 278
 279 # Additional ARCH settings for tile
 280 ifeq ($(ARCH),tilepro)
 281        SRCARCH := tile
 282 endif
 283 ifeq ($(ARCH),tilegx)
 284        SRCARCH := tile
 285 endif
 286
 287 # Where to locate arch specific headers
 288 hdr-arch  := $(SRCARCH)
 289
 290 KCONFIG_CONFIG  ?= .config
 291 export KCONFIG_CONFIG
 292
 293 # SHELL used by kbuild
 294 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 295           else if [ -x /bin/bash ]; then echo /bin/bash; \
 296           else echo sh; fi ; fi)
 297
 298 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
 299 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
 300 HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
 301
 302 HOSTCC       = gcc
 303 HOSTCXX      = g++
 304 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 305                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 306 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 307 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 308 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 309
 310 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 311 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 312                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 313 endif
 314
 315 # Decide whether to build built-in, modular, or both.
 316 # Normally, just do built-in.
 317
 318 KBUILD_MODULES :=
 319 KBUILD_BUILTIN := 1
 320
 321 # If we have only "make modules", don't compile built-in objects.
 322 # When we're building modules with modversions, we need to consider
 323 # the built-in objects during the descend as well, in order to
 324 # make sure the checksums are up to date before we record them.
 325
 326 ifeq ($(MAKECMDGOALS),modules)
 327   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 328 endif
 329
 330 # If we have "make <whatever> modules", compile modules
 331 # in addition to whatever we do anyway.
 332 # Just "make" or "make all" shall build modules as well
 333
 334 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 335   KBUILD_MODULES := 1
 336 endif
 337
 338 ifeq ($(MAKECMDGOALS),)
 339   KBUILD_MODULES := 1
 340 endif
 341
 342 export KBUILD_MODULES KBUILD_BUILTIN
 343 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 344
 345 # We need some generic definitions (do not try to remake the file).
 346 scripts/Kbuild.include: ;
 347 include scripts/Kbuild.include
 348
 349 # Make variables (CC, etc...)
 350 AS              = $(CROSS_COMPILE)as
 351 LD              = $(CROSS_COMPILE)ld
 352 CC              = $(CROSS_COMPILE)gcc
 353 CPP             = $(CC) -E
 354 AR              = $(CROSS_COMPILE)ar
 355 NM              = $(CROSS_COMPILE)nm
 356 STRIP           = $(CROSS_COMPILE)strip
 357 OBJCOPY         = $(CROSS_COMPILE)objcopy
 358 OBJDUMP         = $(CROSS_COMPILE)objdump
 359 AWK             = awk
 360 GENKSYMS        = scripts/genksyms/genksyms
 361 INSTALLKERNEL  := installkernel
 362 DEPMOD          = /sbin/depmod
 363 PERL            = perl
 364 PYTHON          = python
 365 CHECK           = sparse
 366
 367 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 368                   -Wbitwise -Wno-return-void $(CF)
 369 NOSTDINC_FLAGS  =
 370 CFLAGS_MODULE   =
 371 AFLAGS_MODULE   =
 372 LDFLAGS_MODULE  =
 373 CFLAGS_KERNEL   =
 374 AFLAGS_KERNEL   =
 375 LDFLAGS_vmlinux =
 376
 377 # Use USERINCLUDE when you must reference the UAPI directories only.
 378 USERINCLUDE    := \
 379                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 380                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 381                 -I$(srctree)/include/uapi \
 382                 -I$(objtree)/include/generated/uapi \
 383                 -include $(srctree)/include/linux/kconfig.h
 384
 385 # Use LINUXINCLUDE when you must reference the include/ directory.
 386 # Needed to be compatible with the O= option
 387 LINUXINCLUDE    := \
 388                 -I$(srctree)/arch/$(hdr-arch)/include \
 389                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 390                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 391                 -I$(objtree)/include \
 392                 $(USERINCLUDE)
 393
 394 KBUILD_AFLAGS   := -D__ASSEMBLY__
 395 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 396                    -fno-strict-aliasing -fno-common -fshort-wchar \
 397                    -Werror-implicit-function-declaration \
 398                    -Wno-format-security \
 399                    -std=gnu89
 400 KBUILD_CPPFLAGS := -D__KERNEL__
 401 KBUILD_AFLAGS_KERNEL :=
 402 KBUILD_CFLAGS_KERNEL :=
 403 KBUILD_AFLAGS_MODULE  := -DMODULE
 404 KBUILD_CFLAGS_MODULE  := -DMODULE
 405 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 406 GCC_PLUGINS_CFLAGS :=
 407
 408 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 409 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 410 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 411
 412 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 413 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 414 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 415 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 416 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 417
 418 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 419 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_KASAN CFLAGS_UBSAN
 420 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 421 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 422 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 423 export KBUILD_ARFLAGS
 424
 425 # When compiling out-of-tree modules, put MODVERDIR in the module
 426 # tree rather than in the kernel tree. The kernel tree might
 427 # even be read-only.
 428 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 429
 430 # Files to ignore in find ... statements
 431
 432 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 433                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 434                           -prune -o
 435 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 436                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 437
 438 # ===========================================================================
 439 # Rules shared between *config targets and build targets
 440
 441 # Basic helpers built in scripts/basic/
 442 PHONY += scripts_basic
 443 scripts_basic:
 444         $(Q)$(MAKE) $(build)=scripts/basic
 445         $(Q)rm -f .tmp_quiet_recordmcount
 446
 447 # To avoid any implicit rule to kick in, define an empty command.
 448 scripts/basic/%: scripts_basic ;
 449
 450 PHONY += outputmakefile
 451 # outputmakefile generates a Makefile in the output directory, if using a
 452 # separate output directory. This allows convenient use of make in the
 453 # output directory.
 454 outputmakefile:
 455 ifneq ($(KBUILD_SRC),)
 456         $(Q)ln -fsn $(srctree) source
 457         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 458             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 459 endif
 460
 461 # Support for using generic headers in asm-generic
 462 PHONY += asm-generic uapi-asm-generic
 463 asm-generic: uapi-asm-generic
 464         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 465                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 466 uapi-asm-generic:
 467         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 468                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 469
 470 # To make sure we do not include .config for any of the *config targets
 471 # catch them early, and hand them over to scripts/kconfig/Makefile
 472 # It is allowed to specify more targets when calling make, including
 473 # mixing *config targets and build targets.
 474 # For example 'make oldconfig all'.
 475 # Detect when mixed targets is specified, and make a second invocation
 476 # of make so .config is not included in this case either (for *config).
 477
 478 version_h := include/generated/uapi/linux/version.h
 479 old_version_h := include/linux/version.h
 480
 481 no-dot-config-targets := clean mrproper distclean \
 482                          cscope gtags TAGS tags help% %docs check% coccicheck \
 483                          $(version_h) headers_% archheaders archscripts \
 484                          kernelversion %src-pkg
 485
 486 config-targets := 0
 487 mixed-targets  := 0
 488 dot-config     := 1
 489
 490 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 491         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 492                 dot-config := 0
 493         endif
 494 endif
 495
 496 ifeq ($(KBUILD_EXTMOD),)
 497         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 498                 config-targets := 1
 499                 ifneq ($(words $(MAKECMDGOALS)),1)
 500                         mixed-targets := 1
 501                 endif
 502         endif
 503 endif
 504 # install and modules_install need also be processed one by one
 505 ifneq ($(filter install,$(MAKECMDGOALS)),)
 506         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 507                 mixed-targets := 1
 508         endif
 509 endif
 510
 511 ifeq ($(mixed-targets),1)
 512 # ===========================================================================
 513 # We're called with mixed targets (*config and build targets).
 514 # Handle them one by one.
 515
 516 PHONY += $(MAKECMDGOALS) __build_one_by_one
 517
 518 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 519         @:
 520
 521 __build_one_by_one:
 522         $(Q)set -e; \
 523         for i in $(MAKECMDGOALS); do \
 524                 $(MAKE) -f $(srctree)/Makefile $$i; \
 525         done
 526
 527 else
 528 ifeq ($(config-targets),1)
 529 # ===========================================================================
 530 # *config targets only - make sure prerequisites are updated, and descend
 531 # in scripts/kconfig to make the *config target
 532
 533 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 534 # KBUILD_DEFCONFIG may point out an alternative default configuration
 535 # used for 'make defconfig'
 536 include arch/$(SRCARCH)/Makefile
 537 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 538
 539 config: scripts_basic outputmakefile FORCE
 540         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 541
 542 %config: scripts_basic outputmakefile FORCE
 543         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 544
 545 else
 546 # ===========================================================================
 547 # Build targets only - this includes vmlinux, arch specific targets, clean
 548 # targets and others. In general all targets except *config targets.
 549
 550 ifeq ($(KBUILD_EXTMOD),)
 551 # Additional helpers built in scripts/
 552 # Carefully list dependencies so we do not try to build scripts twice
 553 # in parallel
 554 PHONY += scripts
 555 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 556          asm-generic gcc-plugins
 557         $(Q)$(MAKE) $(build)=$(@)
 558
 559 # Objects we will link into vmlinux / subdirs we need to visit
 560 init-y          := init/
 561 drivers-y       := drivers/ sound/ firmware/
 562 net-y           := net/
 563 libs-y          := lib/
 564 core-y          := usr/
 565 virt-y          := virt/
 566 endif # KBUILD_EXTMOD
 567
 568 ifeq ($(dot-config),1)
 569 # Read in config
 570 -include include/config/auto.conf
 571
 572 ifeq ($(KBUILD_EXTMOD),)
 573 # Read in dependencies to all Kconfig* files, make sure to run
 574 # oldconfig if changes are detected.
 575 -include include/config/auto.conf.cmd
 576
 577 # To avoid any implicit rule to kick in, define an empty command
 578 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 579
 580 # If .config is newer than include/config/auto.conf, someone tinkered
 581 # with it and forgot to run make oldconfig.
 582 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 583 # we execute the config step to be sure to catch updated Kconfig files
 584 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 585         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 586 else
 587 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 588 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 589 PHONY += include/config/auto.conf
 590
 591 include/config/auto.conf:
 592         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 593         echo >&2;                                                       \
 594         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 595         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 596         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 597         echo >&2 ;                                                      \
 598         /bin/false)
 599
 600 endif # KBUILD_EXTMOD
 601
 602 else
 603 # Dummy target needed, because used as prerequisite
 604 include/config/auto.conf: ;
 605 endif # $(dot-config)
 606
 607 # For the kernel to actually contain only the needed exported symbols,
 608 # we have to build modules as well to determine what those symbols are.
 609 # (this can be evaluated only once include/config/auto.conf has been included)
 610 ifdef CONFIG_TRIM_UNUSED_KSYMS
 611   KBUILD_MODULES := 1
 612 endif
 613
 614 # The all: target is the default when no target is given on the
 615 # command line.
 616 # This allow a user to issue only 'make' to build a kernel including modules
 617 # Defaults to vmlinux, but the arch makefile usually adds further targets
 618 all: vmlinux
 619
 620 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 621 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 622 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 623 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 624 export CFLAGS_GCOV CFLAGS_KCOV
 625
 626 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 627 # values of the respective KBUILD_* variables
 628 ARCH_CPPFLAGS :=
 629 ARCH_AFLAGS :=
 630 ARCH_CFLAGS :=
 631 include arch/$(SRCARCH)/Makefile
 632
 633 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 634 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 635 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 636 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 637 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 638
 639 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 640 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 641 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 642 else
 643 ifdef CONFIG_PROFILE_ALL_BRANCHES
 644 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 645 else
 646 KBUILD_CFLAGS   += -O2
 647 endif
 648 endif
 649
 650 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 651                         $(call cc-disable-warning,maybe-uninitialized,))
 652
 653 # Tell gcc to never replace conditional load with a non-conditional one
 654 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 655
 656 # check for 'asm goto'
 657 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 658         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 659         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 660 endif
 661
 662 include scripts/Makefile.gcc-plugins
 663
 664 ifdef CONFIG_READABLE_ASM
 665 # Disable optimizations that make assembler listings hard to read.
 666 # reorder blocks reorders the control in the function
 667 # ipa clone creates specialized cloned functions
 668 # partial inlining inlines only parts of functions
 669 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 670                  $(call cc-option,-fno-ipa-cp-clone,) \
 671                  $(call cc-option,-fno-partial-inlining)
 672 endif
 673
 674 ifneq ($(CONFIG_FRAME_WARN),0)
 675 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 676 endif
 677
 678 # This selects the stack protector compiler flag. Testing it is delayed
 679 # until after .config has been reprocessed, in the prepare-compiler-check
 680 # target.
 681 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 682   stackp-flag := -fstack-protector
 683   stackp-name := REGULAR
 684 else
 685 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 686   stackp-flag := -fstack-protector-strong
 687   stackp-name := STRONG
 688 else
 689   # Force off for distro compilers that enable stack protector by default.
 690   stackp-flag := $(call cc-option, -fno-stack-protector)
 691 endif
 692 endif
 693 # Find arch-specific stack protector compiler sanity-checking script.
 694 ifdef CONFIG_CC_STACKPROTECTOR
 695   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 696   stackp-check := $(wildcard $(stackp-path))
 697 endif
 698 KBUILD_CFLAGS += $(stackp-flag)
 699
 700 ifeq ($(cc-name),clang)
 701 ifneq ($(CROSS_COMPILE),)
 702 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 703 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 704 endif
 705 ifneq ($(GCC_TOOLCHAIN),)
 706 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 707 endif
 708 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 709 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 710 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 711 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 712 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 713 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 714 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 715 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 716 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 717 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 718 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 719 # See modpost pattern 2
 720 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 721 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 722 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 723 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 724 else
 725
 726 # These warnings generated too much noise in a regular build.
 727 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 728 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 729 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 730 endif
 731
 732 ifdef CONFIG_FRAME_POINTER
 733 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 734 else
 735 # Some targets (ARM with Thumb2, for example), can't be built with frame
 736 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 737 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 738 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 739 # -fomit-frame-pointer with FUNCTION_TRACER.
 740 ifndef CONFIG_FUNCTION_TRACER
 741 KBUILD_CFLAGS   += -fomit-frame-pointer
 742 endif
 743 endif
 744
 745 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 746
 747 ifdef CONFIG_DEBUG_INFO
 748 ifdef CONFIG_DEBUG_INFO_SPLIT
 749 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 750 else
 751 KBUILD_CFLAGS   += -g
 752 endif
 753 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 754 endif
 755 ifdef CONFIG_DEBUG_INFO_DWARF4
 756 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 757 endif
 758
 759 ifdef CONFIG_DEBUG_INFO_REDUCED
 760 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 761                    $(call cc-option,-fno-var-tracking)
 762 endif
 763
 764 ifdef CONFIG_FUNCTION_TRACER
 765 ifndef CC_FLAGS_FTRACE
 766 CC_FLAGS_FTRACE := -pg
 767 endif
 768 export CC_FLAGS_FTRACE
 769 ifdef CONFIG_HAVE_FENTRY
 770 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 771 endif
 772 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 773 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 774 ifdef CONFIG_DYNAMIC_FTRACE
 775         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 776                 BUILD_C_RECORDMCOUNT := y
 777                 export BUILD_C_RECORDMCOUNT
 778         endif
 779 endif
 780 endif
 781
 782 # We trigger additional mismatches with less inlining
 783 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 784 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 785 endif
 786
 787 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 788 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 789 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 790 endif
 791
 792 # arch Makefile may override CC so keep this after arch Makefile is included
 793 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 794 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 795
 796 # warn about C99 declaration after statement
 797 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 798
 799 # disable pointer signed / unsigned warnings in gcc 4.0
 800 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 801
 802 # disable invalid "can't wrap" optimizations for signed / pointers
 803 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 804
 805 # conserve stack if available
 806 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 807
 808 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 809 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 810
 811 # require functions to have arguments in prototypes, not empty 'int foo()'
 812 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 813
 814 # Prohibit date/time macros, which would make the build non-deterministic
 815 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 816
 817 # enforce correct pointer usage
 818 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 819
 820 # Require designated initializers for all marked structures
 821 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 822
 823 # use the deterministic mode of AR if available
 824 KBUILD_ARFLAGS := $(call ar-option,D)
 825
 826 include scripts/Makefile.kasan
 827 include scripts/Makefile.extrawarn
 828 include scripts/Makefile.ubsan
 829
 830 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 831 # last assignments
 832 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 833 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 834 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 835
 836 # Use --build-id when available.
 837 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 838                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 839 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 840 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 841
 842 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 843 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 844 endif
 845
 846 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 847 LDFLAGS_vmlinux += $(call ld-option, -X,)
 848 endif
 849
 850 # Default kernel image to build when no specific target is given.
 851 # KBUILD_IMAGE may be overruled on the command line or
 852 # set in the environment
 853 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 854 # this default value
 855 export KBUILD_IMAGE ?= vmlinux
 856
 857 #
 858 # INSTALL_PATH specifies where to place the updated kernel and system map
 859 # images. Default is /boot, but you can set it to other values
 860 export  INSTALL_PATH ?= /boot
 861
 862 #
 863 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 864 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 865 # an argument if needed. Otherwise it defaults to the kernel install path
 866 #
 867 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 868
 869 #
 870 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 871 # relocations required by build roots.  This is not defined in the
 872 # makefile but the argument can be passed to make if needed.
 873 #
 874
 875 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 876 export MODLIB
 877
 878 #
 879 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 880 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 881 # the default option --strip-debug will be used.  Otherwise,
 882 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 883
 884 ifdef INSTALL_MOD_STRIP
 885 ifeq ($(INSTALL_MOD_STRIP),1)
 886 mod_strip_cmd = $(STRIP) --strip-debug
 887 else
 888 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 889 endif # INSTALL_MOD_STRIP=1
 890 else
 891 mod_strip_cmd = true
 892 endif # INSTALL_MOD_STRIP
 893 export mod_strip_cmd
 894
 895 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 896 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 897 # or CONFIG_MODULE_COMPRESS_XZ.
 898
 899 mod_compress_cmd = true
 900 ifdef CONFIG_MODULE_COMPRESS
 901   ifdef CONFIG_MODULE_COMPRESS_GZIP
 902     mod_compress_cmd = gzip -n -f
 903   endif # CONFIG_MODULE_COMPRESS_GZIP
 904   ifdef CONFIG_MODULE_COMPRESS_XZ
 905     mod_compress_cmd = xz -f
 906   endif # CONFIG_MODULE_COMPRESS_XZ
 907 endif # CONFIG_MODULE_COMPRESS
 908 export mod_compress_cmd
 909
 910 # Select initial ramdisk compression format, default is gzip(1).
 911 # This shall be used by the dracut(8) tool while creating an initramfs image.
 912 #
 913 INITRD_COMPRESS-y                  := gzip
 914 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 915 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 916 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 917 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 918 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 919 # do not export INITRD_COMPRESS, since we didn't actually
 920 # choose a sane default compression above.
 921 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 922
 923 ifdef CONFIG_MODULE_SIG_ALL
 924 $(eval $(call config_filename,MODULE_SIG_KEY))
 925
 926 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 927 else
 928 mod_sign_cmd = true
 929 endif
 930 export mod_sign_cmd
 931
 932 ifdef CONFIG_STACK_VALIDATION
 933   has_libelf := $(call try-run,\
 934                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 935   ifeq ($(has_libelf),1)
 936     objtool_target := tools/objtool FORCE
 937   else
 938     ifdef CONFIG_UNWINDER_ORC
 939       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 940     else
 941       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 942     endif
 943     SKIP_STACK_VALIDATION := 1
 944     export SKIP_STACK_VALIDATION
 945   endif
 946 endif
 947
 948
 949 ifeq ($(KBUILD_EXTMOD),)
 950 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 951
 952 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 953                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 954                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 955
 956 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 957                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 958
 959 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 960 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 961 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 962 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 963 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 964 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
 965 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 966
 967 # Externally visible symbols (used by link-vmlinux.sh)
 968 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 969 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 970 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 971 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 972 export LDFLAGS_vmlinux
 973 # used by scripts/package/Makefile
 974 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 975
 976 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 977
 978 # Include targets which we want to execute sequentially if the rest of the
 979 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 980 # evaluated more than once.
 981 PHONY += vmlinux_prereq
 982 vmlinux_prereq: $(vmlinux-deps) FORCE
 983 ifdef CONFIG_HEADERS_CHECK
 984         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 985 endif
 986 ifdef CONFIG_GDB_SCRIPTS
 987         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
 988 endif
 989 ifdef CONFIG_TRIM_UNUSED_KSYMS
 990         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 991           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 992 endif
 993
 994 # standalone target for easier testing
 995 include/generated/autoksyms.h: FORCE
 996         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 997
 998 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 999
1000 # Final link of vmlinux with optional arch pass after final link
1001 cmd_link-vmlinux =                                                 \
1002         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1003         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1004
1005 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1006         +$(call if_changed,link-vmlinux)
1007
1008 # Build samples along the rest of the kernel
1009 ifdef CONFIG_SAMPLES
1010 vmlinux-dirs += samples
1011 endif
1012
1013 # The actual objects are generated when descending,
1014 # make sure no implicit rule kicks in
1015 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1016
1017 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1018 # Preset locale variables to speed up the build process. Limit locale
1019 # tweaks to this spot to avoid wrong language settings when running
1020 # make menuconfig etc.
1021 # Error messages still appears in the original language
1022
1023 PHONY += $(vmlinux-dirs)
1024 $(vmlinux-dirs): prepare scripts
1025         $(Q)$(MAKE) $(build)=$@
1026
1027 define filechk_kernel.release
1028         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1029 endef
1030
1031 # Store (new) KERNELRELEASE string in include/config/kernel.release
1032 include/config/kernel.release: include/config/auto.conf FORCE
1033         $(call filechk,kernel.release)
1034
1035
1036 # Things we need to do before we recursively start building the kernel
1037 # or the modules are listed in "prepare".
1038 # A multi level approach is used. prepareN is processed before prepareN-1.
1039 # archprepare is used in arch Makefiles and when processed asm symlink,
1040 # version.h and scripts_basic is processed / created.
1041
1042 # Listed in dependency order
1043 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1044
1045 # prepare3 is used to check if we are building in a separate output directory,
1046 # and if so do:
1047 # 1) Check that make has not been executed in the kernel src $(srctree)
1048 prepare3: include/config/kernel.release
1049 ifneq ($(KBUILD_SRC),)
1050         @$(kecho) '  Using $(srctree) as source for kernel'
1051         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1052                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1053                 echo >&2 "  in the '$(srctree)' directory.";\
1054                 /bin/false; \
1055         fi;
1056 endif
1057
1058 # prepare2 creates a makefile if using a separate output directory.
1059 # From this point forward, .config has been reprocessed, so any rules
1060 # that need to depend on updated CONFIG_* values can be checked here.
1061 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1062
1063 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1064                    include/config/auto.conf
1065         $(cmd_crmodverdir)
1066
1067 archprepare: archheaders archscripts prepare1 scripts_basic
1068
1069 prepare0: archprepare gcc-plugins
1070         $(Q)$(MAKE) $(build)=.
1071
1072 # All the preparing..
1073 prepare: prepare0 prepare-objtool
1074
1075 PHONY += prepare-objtool
1076 prepare-objtool: $(objtool_target)
1077
1078 # Check for CONFIG flags that require compiler support. Abort the build
1079 # after .config has been processed, but before the kernel build starts.
1080 #
1081 # For security-sensitive CONFIG options, we don't want to fallback and/or
1082 # silently change which compiler flags will be used, since that leads to
1083 # producing kernels with different security feature characteristics
1084 # depending on the compiler used. (For example, "But I selected
1085 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1086 PHONY += prepare-compiler-check
1087 prepare-compiler-check: FORCE
1088 # Make sure compiler supports requested stack protector flag.
1089 ifdef stackp-name
1090   ifeq ($(call cc-option, $(stackp-flag)),)
1091         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1092                   $(stackp-flag) not supported by compiler >&2 && exit 1
1093   endif
1094 endif
1095 # Make sure compiler does not have buggy stack-protector support.
1096 ifdef stackp-check
1097   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1098         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1099                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1100   endif
1101 endif
1102         @:
1103
1104 # Generate some files
1105 # ---------------------------------------------------------------------------
1106
1107 # KERNELRELEASE can change from a few different places, meaning version.h
1108 # needs to be updated, so this check is forced on all builds
1109
1110 uts_len := 64
1111 define filechk_utsrelease.h
1112         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1113           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1114           exit 1;                                                         \
1115         fi;                                                               \
1116         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1117 endef
1118
1119 define filechk_version.h
1120         (echo \#define LINUX_VERSION_CODE $(shell                         \
1121         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1122         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1123 endef
1124
1125 $(version_h): $(srctree)/Makefile FORCE
1126         $(call filechk,version.h)
1127         $(Q)rm -f $(old_version_h)
1128
1129 include/generated/utsrelease.h: include/config/kernel.release FORCE
1130         $(call filechk,utsrelease.h)
1131
1132 PHONY += headerdep
1133 headerdep:
1134         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1135         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1136
1137 # ---------------------------------------------------------------------------
1138 # Kernel headers
1139
1140 #Default location for installed headers
1141 export INSTALL_HDR_PATH = $(objtree)/usr
1142
1143 # If we do an all arch process set dst to include/arch-$(hdr-arch)
1144 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
1145
1146 PHONY += archheaders
1147 archheaders:
1148
1149 PHONY += archscripts
1150 archscripts:
1151
1152 PHONY += __headers
1153 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1154         $(Q)$(MAKE) $(build)=scripts build_unifdef
1155
1156 PHONY += headers_install_all
1157 headers_install_all:
1158         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1159
1160 PHONY += headers_install
1161 headers_install: __headers
1162         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1163           $(error Headers not exportable for the $(SRCARCH) architecture))
1164         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1165         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
1166
1167 PHONY += headers_check_all
1168 headers_check_all: headers_install_all
1169         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1170
1171 PHONY += headers_check
1172 headers_check: headers_install
1173         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1174         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
1175
1176 # ---------------------------------------------------------------------------
1177 # Kernel selftest
1178
1179 PHONY += kselftest
1180 kselftest:
1181         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1182
1183 PHONY += kselftest-clean
1184 kselftest-clean:
1185         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1186
1187 PHONY += kselftest-merge
1188 kselftest-merge:
1189         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1190         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1191                 -m $(objtree)/.config \
1192                 $(srctree)/tools/testing/selftests/*/config
1193         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1194
1195 # ---------------------------------------------------------------------------
1196 # Modules
1197
1198 ifdef CONFIG_MODULES
1199
1200 # By default, build modules as well
1201
1202 all: modules
1203
1204 # Build modules
1205 #
1206 # A module can be listed more than once in obj-m resulting in
1207 # duplicate lines in modules.order files.  Those are removed
1208 # using awk while concatenating to the final file.
1209
1210 PHONY += modules
1211 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1212         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1213         @$(kecho) '  Building modules, stage 2.';
1214         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1215
1216 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1217         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1218
1219 %/modules.builtin: include/config/auto.conf
1220         $(Q)$(MAKE) $(modbuiltin)=$*
1221
1222
1223 # Target to prepare building external modules
1224 PHONY += modules_prepare
1225 modules_prepare: prepare scripts
1226
1227 # Target to install modules
1228 PHONY += modules_install
1229 modules_install: _modinst_ _modinst_post
1230
1231 PHONY += _modinst_
1232 _modinst_:
1233         @rm -rf $(MODLIB)/kernel
1234         @rm -f $(MODLIB)/source
1235         @mkdir -p $(MODLIB)/kernel
1236         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1237         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1238                 rm -f $(MODLIB)/build ; \
1239                 ln -s $(CURDIR) $(MODLIB)/build ; \
1240         fi
1241         @cp -f $(objtree)/modules.order $(MODLIB)/
1242         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1243         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1244
1245 # This depmod is only for convenience to give the initial
1246 # boot a modules.dep even before / is mounted read-write.  However the
1247 # boot script depmod is the master version.
1248 PHONY += _modinst_post
1249 _modinst_post: _modinst_
1250         $(call cmd,depmod)
1251
1252 ifeq ($(CONFIG_MODULE_SIG), y)
1253 PHONY += modules_sign
1254 modules_sign:
1255         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1256 endif
1257
1258 else # CONFIG_MODULES
1259
1260 # Modules not configured
1261 # ---------------------------------------------------------------------------
1262
1263 PHONY += modules modules_install
1264 modules modules_install:
1265         @echo >&2
1266         @echo >&2 "The present kernel configuration has modules disabled."
1267         @echo >&2 "Type 'make config' and enable loadable module support."
1268         @echo >&2 "Then build a kernel with module support enabled."
1269         @echo >&2
1270         @exit 1
1271
1272 endif # CONFIG_MODULES
1273
1274 ###
1275 # Cleaning is done on three levels.
1276 # make clean     Delete most generated files
1277 #                Leave enough to build external modules
1278 # make mrproper  Delete the current configuration, and all generated files
1279 # make distclean Remove editor backup files, patch leftover files and the like
1280
1281 # Directories & files removed with 'make clean'
1282 CLEAN_DIRS  += $(MODVERDIR)
1283
1284 # Directories & files removed with 'make mrproper'
1285 MRPROPER_DIRS  += include/config usr/include include/generated          \
1286                   arch/*/include/generated .tmp_objdiff
1287 MRPROPER_FILES += .config .config.old .version .old_version \
1288                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1289                   signing_key.pem signing_key.priv signing_key.x509     \
1290                   x509.genkey extra_certificates signing_key.x509.keyid \
1291                   signing_key.x509.signer vmlinux-gdb.py
1292
1293 # clean - Delete most, but leave enough to build external modules
1294 #
1295 clean: rm-dirs  := $(CLEAN_DIRS)
1296 clean: rm-files := $(CLEAN_FILES)
1297 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1298
1299 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1300 $(clean-dirs):
1301         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1302
1303 vmlinuxclean:
1304         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1305         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1306
1307 clean: archclean vmlinuxclean
1308
1309 # mrproper - Delete all generated files, including .config
1310 #
1311 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1312 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1313 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1314
1315 PHONY += $(mrproper-dirs) mrproper archmrproper
1316 $(mrproper-dirs):
1317         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1318
1319 mrproper: clean archmrproper $(mrproper-dirs)
1320         $(call cmd,rmdirs)
1321         $(call cmd,rmfiles)
1322
1323 # distclean
1324 #
1325 PHONY += distclean
1326
1327 distclean: mrproper
1328         @find $(srctree) $(RCS_FIND_IGNORE) \
1329                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1330                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1331                 -o -name 'core' \) \
1332                 -type f -print | xargs rm -f
1333
1334
1335 # Packaging of the kernel to various formats
1336 # ---------------------------------------------------------------------------
1337 # rpm target kept for backward compatibility
1338 package-dir     := scripts/package
1339
1340 %src-pkg: FORCE
1341         $(Q)$(MAKE) $(build)=$(package-dir) $@
1342 %pkg: include/config/kernel.release FORCE
1343         $(Q)$(MAKE) $(build)=$(package-dir) $@
1344 rpm: include/config/kernel.release FORCE
1345         $(Q)$(MAKE) $(build)=$(package-dir) $@
1346
1347
1348 # Brief documentation of the typical targets used
1349 # ---------------------------------------------------------------------------
1350
1351 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1352 boards := $(sort $(notdir $(boards)))
1353 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1354 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1355
1356 PHONY += help
1357 help:
1358         @echo  'Cleaning targets:'
1359         @echo  '  clean           - Remove most generated files but keep the config and'
1360         @echo  '                    enough build support to build external modules'
1361         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1362         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1363         @echo  ''
1364         @echo  'Configuration targets:'
1365         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1366         @echo  ''
1367         @echo  'Other generic targets:'
1368         @echo  '  all             - Build all targets marked with [*]'
1369         @echo  '* vmlinux         - Build the bare kernel'
1370         @echo  '* modules         - Build all modules'
1371         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1372         @echo  '  dir/            - Build all files in dir and below'
1373         @echo  '  dir/file.[ois]  - Build specified target only'
1374         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1375         @echo  '                    (requires compiler support for LLVM assembly generation)'
1376         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1377         @echo  '                    (requires a recent binutils and recent build (System.map))'
1378         @echo  '  dir/file.ko     - Build module including final link'
1379         @echo  '  modules_prepare - Set up for building external modules'
1380         @echo  '  tags/TAGS       - Generate tags file for editors'
1381         @echo  '  cscope          - Generate cscope index'
1382         @echo  '  gtags           - Generate GNU GLOBAL index'
1383         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1384         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1385         @echo  '  image_name      - Output the image name (use with make -s)'
1386         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1387          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1388          echo  ''
1389         @echo  'Static analysers:'
1390         @echo  '  checkstack      - Generate a list of stack hogs'
1391         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1392         @echo  '  versioncheck    - Sanity check on version.h usage'
1393         @echo  '  includecheck    - Check for duplicate included header files'
1394         @echo  '  export_report   - List the usages of all exported symbols'
1395         @echo  '  headers_check   - Sanity check on exported headers'
1396         @echo  '  headerdep       - Detect inclusion cycles in headers'
1397         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1398         @echo  ''
1399         @echo  'Kernel selftest:'
1400         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1401         @echo  '                    Build, install, and boot kernel before'
1402         @echo  '                    running kselftest on it'
1403         @echo  '  kselftest-clean - Remove all generated kselftest files'
1404         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1405         @echo  '                    .config.'
1406         @echo  ''
1407         @echo 'Userspace tools targets:'
1408         @echo '  use "make tools/help"'
1409         @echo '  or  "cd tools; make help"'
1410         @echo  ''
1411         @echo  'Kernel packaging:'
1412         @$(MAKE) $(build)=$(package-dir) help
1413         @echo  ''
1414         @echo  'Documentation targets:'
1415         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1416         @echo  ''
1417         @echo  'Architecture specific targets ($(SRCARCH)):'
1418         @$(if $(archhelp),$(archhelp),\
1419                 echo '  No architecture specific help defined for $(SRCARCH)')
1420         @echo  ''
1421         @$(if $(boards), \
1422                 $(foreach b, $(boards), \
1423                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1424                 echo '')
1425         @$(if $(board-dirs), \
1426                 $(foreach b, $(board-dirs), \
1427                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1428                 printf "  %-16s - Show all of the above\\n" help-boards; \
1429                 echo '')
1430
1431         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1432         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1433         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1434         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1435         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1436         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1437         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1438         @echo  '                1: warnings which may be relevant and do not occur too often'
1439         @echo  '                2: warnings which occur quite often but may still be relevant'
1440         @echo  '                3: more obscure warnings, can most likely be ignored'
1441         @echo  '                Multiple levels can be combined with W=12 or W=123'
1442         @echo  ''
1443         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1444         @echo  'For further info see the ./README file'
1445
1446
1447 help-board-dirs := $(addprefix help-,$(board-dirs))
1448
1449 help-boards: $(help-board-dirs)
1450
1451 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1452
1453 $(help-board-dirs): help-%:
1454         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1455         @$(if $(boards-per-dir), \
1456                 $(foreach b, $(boards-per-dir), \
1457                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1458                 echo '')
1459
1460
1461 # Documentation targets
1462 # ---------------------------------------------------------------------------
1463 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs
1464 PHONY += $(DOC_TARGETS)
1465 $(DOC_TARGETS): scripts_basic FORCE
1466         $(Q)$(MAKE) $(build)=Documentation $@
1467
1468 else # KBUILD_EXTMOD
1469
1470 ###
1471 # External module support.
1472 # When building external modules the kernel used as basis is considered
1473 # read-only, and no consistency checks are made and the make
1474 # system is not used on the basis kernel. If updates are required
1475 # in the basis kernel ordinary make commands (without M=...) must
1476 # be used.
1477 #
1478 # The following are the only valid targets when building external
1479 # modules.
1480 # make M=dir clean     Delete all automatically generated files
1481 # make M=dir modules   Make all modules in specified dir
1482 # make M=dir           Same as 'make M=dir modules'
1483 # make M=dir modules_install
1484 #                      Install the modules built in the module directory
1485 #                      Assumes install directory is already created
1486
1487 # We are always building modules
1488 KBUILD_MODULES := 1
1489 PHONY += crmodverdir
1490 crmodverdir:
1491         $(cmd_crmodverdir)
1492
1493 PHONY += $(objtree)/Module.symvers
1494 $(objtree)/Module.symvers:
1495         @test -e $(objtree)/Module.symvers || ( \
1496         echo; \
1497         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1498         echo "           is missing; modules will have no dependencies and modversions."; \
1499         echo )
1500
1501 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1502 PHONY += $(module-dirs) modules
1503 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1504         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1505
1506 modules: $(module-dirs)
1507         @$(kecho) '  Building modules, stage 2.';
1508         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1509
1510 PHONY += modules_install
1511 modules_install: _emodinst_ _emodinst_post
1512
1513 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1514 PHONY += _emodinst_
1515 _emodinst_:
1516         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1517         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1518
1519 PHONY += _emodinst_post
1520 _emodinst_post: _emodinst_
1521         $(call cmd,depmod)
1522
1523 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1524
1525 PHONY += $(clean-dirs) clean
1526 $(clean-dirs):
1527         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1528
1529 clean:  rm-dirs := $(MODVERDIR)
1530 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1531
1532 PHONY += help
1533 help:
1534         @echo  '  Building external modules.'
1535         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1536         @echo  ''
1537         @echo  '  modules         - default target, build the module(s)'
1538         @echo  '  modules_install - install the module'
1539         @echo  '  clean           - remove generated files in module directory only'
1540         @echo  ''
1541
1542 # Dummies...
1543 PHONY += prepare scripts
1544 prepare: ;
1545 scripts: ;
1546 endif # KBUILD_EXTMOD
1547
1548 clean: $(clean-dirs)
1549         $(call cmd,rmdirs)
1550         $(call cmd,rmfiles)
1551         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1552                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1553                 -o -name '*.ko.*' \
1554                 -o -name '*.dwo'  \
1555                 -o -name '*.su'  \
1556                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1557                 -o -name '*.symtypes' -o -name 'modules.order' \
1558                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1559                 -o -name '*.c.[012]*.*' \
1560                 -o -name '*.ll' \
1561                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1562
1563 # Generate tags for editors
1564 # ---------------------------------------------------------------------------
1565 quiet_cmd_tags = GEN     $@
1566       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1567
1568 tags TAGS cscope gtags: FORCE
1569         $(call cmd,tags)
1570
1571 # Scripts to check various things for consistency
1572 # ---------------------------------------------------------------------------
1573
1574 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1575
1576 includecheck:
1577         find $(srctree)/* $(RCS_FIND_IGNORE) \
1578                 -name '*.[hcS]' -type f -print | sort \
1579                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1580
1581 versioncheck:
1582         find $(srctree)/* $(RCS_FIND_IGNORE) \
1583                 -name '*.[hcS]' -type f -print | sort \
1584                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1585
1586 coccicheck:
1587         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1588
1589 namespacecheck:
1590         $(PERL) $(srctree)/scripts/namespace.pl
1591
1592 export_report:
1593         $(PERL) $(srctree)/scripts/export_report.pl
1594
1595 endif #ifeq ($(config-targets),1)
1596 endif #ifeq ($(mixed-targets),1)
1597
1598 PHONY += checkstack kernelrelease kernelversion image_name
1599
1600 # UML needs a little special treatment here.  It wants to use the host
1601 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1602 # else wants $(ARCH), including people doing cross-builds, which means
1603 # that $(SUBARCH) doesn't work here.
1604 ifeq ($(ARCH), um)
1605 CHECKSTACK_ARCH := $(SUBARCH)
1606 else
1607 CHECKSTACK_ARCH := $(ARCH)
1608 endif
1609 checkstack:
1610         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1611         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1612
1613 kernelrelease:
1614         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1615
1616 kernelversion:
1617         @echo $(KERNELVERSION)
1618
1619 image_name:
1620         @echo $(KBUILD_IMAGE)
1621
1622 # Clear a bunch of variables before executing the submake
1623 tools/: FORCE
1624         $(Q)mkdir -p $(objtree)/tools
1625         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1626
1627 tools/%: FORCE
1628         $(Q)mkdir -p $(objtree)/tools
1629         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1630
1631 # Single targets
1632 # ---------------------------------------------------------------------------
1633 # Single targets are compatible with:
1634 # - build with mixed source and output
1635 # - build with separate output dir 'make O=...'
1636 # - external modules
1637 #
1638 #  target-dir => where to store outputfile
1639 #  build-dir  => directory in kernel source tree to use
1640
1641 ifeq ($(KBUILD_EXTMOD),)
1642         build-dir  = $(patsubst %/,%,$(dir $@))
1643         target-dir = $(dir $@)
1644 else
1645         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1646         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1647         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1648 endif
1649
1650 %.s: %.c prepare scripts FORCE
1651         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1652 %.i: %.c prepare scripts FORCE
1653         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1654 %.o: %.c prepare scripts FORCE
1655         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1656 %.lst: %.c prepare scripts FORCE
1657         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1658 %.s: %.S prepare scripts FORCE
1659         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1660 %.o: %.S prepare scripts FORCE
1661         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1662 %.symtypes: %.c prepare scripts FORCE
1663         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1664 %.ll: %.c prepare scripts FORCE
1665         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1666
1667 # Modules
1668 /: prepare scripts FORCE
1669         $(cmd_crmodverdir)
1670         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1671         $(build)=$(build-dir)
1672 # Make sure the latest headers are built for Documentation
1673 Documentation/ samples/: headers_install
1674 %/: prepare scripts FORCE
1675         $(cmd_crmodverdir)
1676         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1677         $(build)=$(build-dir)
1678 %.ko: prepare scripts FORCE
1679         $(cmd_crmodverdir)
1680         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1681         $(build)=$(build-dir) $(@:.ko=.o)
1682         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1683
1684 # FIXME Should go into a make.lib or something
1685 # ===========================================================================
1686
1687 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1688       cmd_rmdirs = rm -rf $(rm-dirs)
1689
1690 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1691       cmd_rmfiles = rm -f $(rm-files)
1692
1693 # Run depmod only if we have System.map and depmod is executable
1694 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1695       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1696                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1697
1698 # Create temporary dir for module support files
1699 # clean it up only when building all modules
1700 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1701                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1702
1703 # read all saved command lines
1704
1705 targets := $(wildcard $(sort $(targets)))
1706 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1707
1708 ifneq ($(cmd_files),)
1709   $(cmd_files): ;       # Do not try to update included dependency files
1710   include $(cmd_files)
1711 endif
1712
1713 endif   # skip-makefile
1714
1715 PHONY += FORCE
1716 FORCE:
1717
1718 # Declare the contents of the .PHONY variable as phony.  We keep that
1719 # information in a variable so we can use it in if_changed and friends.
1720 .PHONY: $(PHONY)