Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 3
   4 SUBLEVEL = 0
   5 EXTRAVERSION =
   6 NAME = Bobtail Squid
   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 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # We are using a recursive build, so we need to do a little thinking
  19 # to get the ordering right.
  20 #
  21 # Most importantly: sub-Makefiles should only ever modify files in
  22 # their own directory. If in some directory we have a dependency on
  23 # a file in another dir (which doesn't happen often, but it's often
  24 # unavoidable when linking the built-in.a targets which finally
  25 # turn into vmlinux), we will call a sub make in that other dir, and
  26 # after that we are sure that everything which is in that other dir
  27 # is now up to date.
  28 #
  29 # The only cases where we need to modify files which have global
  30 # effects are thus separated out and done before the recursive
  31 # descending is started. They are now explicitly listed as the
  32 # prepare rule.
  33
  34 ifneq ($(sub_make_done),1)
  35
  36 # Do not use make's built-in rules and variables
  37 # (this increases performance and avoids hard-to-debug behaviour)
  38 MAKEFLAGS += -rR
  39
  40 # Avoid funny character set dependencies
  41 unexport LC_ALL
  42 LC_COLLATE=C
  43 LC_NUMERIC=C
  44 export LC_COLLATE LC_NUMERIC
  45
  46 # Avoid interference with shell env settings
  47 unexport GREP_OPTIONS
  48
  49 # Beautify output
  50 # ---------------------------------------------------------------------------
  51 #
  52 # Normally, we echo the whole command before executing it. By making
  53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  54 # $(quiet) to choose other forms of output instead, e.g.
  55 #
  56 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  57 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  58 #
  59 # If $(quiet) is empty, the whole command will be printed.
  60 # If it is set to "quiet_", only the short version will be printed.
  61 # If it is set to "silent_", nothing will be printed at all, since
  62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  63 #
  64 # A simple variant is to prefix commands with $(Q) - that's useful
  65 # for commands that shall be hidden in non-verbose mode.
  66 #
  67 #       $(Q)ln $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 #
  72 # To put more focus on warnings, be less verbose as default
  73 # Use 'make V=1' to see the full commands
  74
  75 ifeq ("$(origin V)", "command line")
  76   KBUILD_VERBOSE = $(V)
  77 endif
  78 ifndef KBUILD_VERBOSE
  79   KBUILD_VERBOSE = 0
  80 endif
  81
  82 ifeq ($(KBUILD_VERBOSE),1)
  83   quiet =
  84   Q =
  85 else
  86   quiet=quiet_
  87   Q = @
  88 endif
  89
  90 # If the user is running make -s (silent mode), suppress echoing of
  91 # commands
  92
  93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  94   quiet=silent_
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # Kbuild will save output files in the current working directory.
 100 # This does not need to match to the root of the kernel source tree.
 101 #
 102 # For example, you can do this:
 103 #
 104 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 105 #
 106 # If you want to save output files in a different location, there are
 107 # two syntaxes to specify it.
 108 #
 109 # 1) O=
 110 # Use "make O=dir/to/store/output/files/"
 111 #
 112 # 2) Set KBUILD_OUTPUT
 113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 115 #
 116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 117 # variable.
 118
 119 # Do we want to change the working directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 ifneq ($(KBUILD_OUTPUT),)
 125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 126 # expand a shell special character '~'. We use a somewhat tedious way here.
 127 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 128 $(if $(abs_objtree),, \
 129      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 130
 131 # $(realpath ...) resolves symlinks
 132 abs_objtree := $(realpath $(abs_objtree))
 133 else
 134 abs_objtree := $(CURDIR)
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136
 137 ifeq ($(abs_objtree),$(CURDIR))
 138 # Suppress "Entering directory ..." unless we are changing the work directory.
 139 MAKEFLAGS += --no-print-directory
 140 else
 141 need-sub-make := 1
 142 endif
 143
 144 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 145
 146 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 147 $(error source directory cannot contain spaces or colons)
 148 endif
 149
 150 ifneq ($(abs_srctree),$(abs_objtree))
 151 # Look for make include files relative to root of kernel src
 152 #
 153 # This does not become effective immediately because MAKEFLAGS is re-parsed
 154 # once after the Makefile is read. We need to invoke sub-make.
 155 MAKEFLAGS += --include-dir=$(abs_srctree)
 156 need-sub-make := 1
 157 endif
 158
 159 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 162 need-sub-make := 1
 163 # Cancel implicit rules for this Makefile.
 164 $(lastword $(MAKEFILE_LIST)): ;
 165 endif
 166
 167 export abs_srctree abs_objtree
 168 export sub_make_done := 1
 169
 170 ifeq ($(need-sub-make),1)
 171
 172 PHONY += $(MAKECMDGOALS) sub-make
 173
 174 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 175         @:
 176
 177 # Invoke a second make in the output directory, passing relevant variables
 178 sub-make:
 179         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 180
 181 endif # need-sub-make
 182 endif # sub_make_done
 183
 184 # We process the rest of the Makefile if this is the final invocation of make
 185 ifeq ($(need-sub-make),)
 186
 187 # Do not print "Entering directory ...",
 188 # but we want to display it when entering to the output directory
 189 # so that IDEs/editors are able to understand relative filenames.
 190 MAKEFLAGS += --no-print-directory
 191
 192 # Call a source code checker (by default, "sparse") as part of the
 193 # C compilation.
 194 #
 195 # Use 'make C=1' to enable checking of only re-compiled files.
 196 # Use 'make C=2' to enable checking of *all* source files, regardless
 197 # of whether they are re-compiled or not.
 198 #
 199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 200 # including where to get the "sparse" utility.
 201
 202 ifeq ("$(origin C)", "command line")
 203   KBUILD_CHECKSRC = $(C)
 204 endif
 205 ifndef KBUILD_CHECKSRC
 206   KBUILD_CHECKSRC = 0
 207 endif
 208
 209 # Use make M=dir to specify directory of external module to build
 210 # Old syntax make ... SUBDIRS=$PWD is still supported
 211 # Setting the environment variable KBUILD_EXTMOD take precedence
 212 ifdef SUBDIRS
 213   $(warning ================= WARNING ================)
 214   $(warning 'SUBDIRS' will be removed after Linux 5.3)
 215   $(warning )
 216   $(warning If you are building an individual subdirectory)
 217   $(warning in the kernel tree, you can do like this:)
 218   $(warning $$ make path/to/dir/you/want/to/build/)
 219   $(warning (Do not forget the trailing slash))
 220   $(warning )
 221   $(warning If you are building an external module,)
 222   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 223   $(warning ==========================================)
 224   KBUILD_EXTMOD ?= $(SUBDIRS)
 225 endif
 226
 227 ifeq ("$(origin M)", "command line")
 228   KBUILD_EXTMOD := $(M)
 229 endif
 230
 231 export KBUILD_CHECKSRC KBUILD_EXTMOD
 232
 233 ifeq ($(abs_srctree),$(abs_objtree))
 234         # building in the source tree
 235         srctree := .
 236         building_out_of_srctree :=
 237 else
 238         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 239                 # building in a subdirectory of the source tree
 240                 srctree := ..
 241         else
 242                 srctree := $(abs_srctree)
 243         endif
 244         building_out_of_srctree := 1
 245 endif
 246
 247 ifneq ($(KBUILD_ABS_SRCTREE),)
 248 srctree := $(abs_srctree)
 249 endif
 250
 251 objtree         := .
 252 VPATH           := $(srctree)
 253
 254 export building_out_of_srctree srctree objtree VPATH
 255
 256 # To make sure we do not include .config for any of the *config targets
 257 # catch them early, and hand them over to scripts/kconfig/Makefile
 258 # It is allowed to specify more targets when calling make, including
 259 # mixing *config targets and build targets.
 260 # For example 'make oldconfig all'.
 261 # Detect when mixed targets is specified, and make a second invocation
 262 # of make so .config is not included in this case either (for *config).
 263
 264 version_h := include/generated/uapi/linux/version.h
 265 old_version_h := include/linux/version.h
 266
 267 clean-targets := %clean mrproper cleandocs
 268 no-dot-config-targets := $(clean-targets) \
 269                          cscope gtags TAGS tags help% %docs check% coccicheck \
 270                          $(version_h) headers headers_% archheaders archscripts \
 271                          %asm-generic kernelversion %src-pkg
 272 no-sync-config-targets := $(no-dot-config-targets) install %install \
 273                            kernelrelease
 274
 275 config-targets  := 0
 276 mixed-targets   := 0
 277 dot-config      := 1
 278 may-sync-config := 1
 279
 280 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 281         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 282                 dot-config := 0
 283         endif
 284 endif
 285
 286 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 287         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 288                 may-sync-config := 0
 289         endif
 290 endif
 291
 292 ifneq ($(KBUILD_EXTMOD),)
 293         may-sync-config := 0
 294 endif
 295
 296 ifeq ($(KBUILD_EXTMOD),)
 297         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 298                 config-targets := 1
 299                 ifneq ($(words $(MAKECMDGOALS)),1)
 300                         mixed-targets := 1
 301                 endif
 302         endif
 303 endif
 304
 305 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 306 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 307         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 308                 mixed-targets := 1
 309         endif
 310 endif
 311
 312 # install and modules_install need also be processed one by one
 313 ifneq ($(filter install,$(MAKECMDGOALS)),)
 314         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 315                 mixed-targets := 1
 316         endif
 317 endif
 318
 319 ifeq ($(mixed-targets),1)
 320 # ===========================================================================
 321 # We're called with mixed targets (*config and build targets).
 322 # Handle them one by one.
 323
 324 PHONY += $(MAKECMDGOALS) __build_one_by_one
 325
 326 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 327         @:
 328
 329 __build_one_by_one:
 330         $(Q)set -e; \
 331         for i in $(MAKECMDGOALS); do \
 332                 $(MAKE) -f $(srctree)/Makefile $$i; \
 333         done
 334
 335 else
 336
 337 include scripts/Kbuild.include
 338
 339 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 340 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 341 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 342 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 343
 344 include scripts/subarch.include
 345
 346 # Cross compiling and selecting different set of gcc/bin-utils
 347 # ---------------------------------------------------------------------------
 348 #
 349 # When performing cross compilation for other architectures ARCH shall be set
 350 # to the target architecture. (See arch/* for the possibilities).
 351 # ARCH can be set during invocation of make:
 352 # make ARCH=ia64
 353 # Another way is to have ARCH set in the environment.
 354 # The default ARCH is the host where make is executed.
 355
 356 # CROSS_COMPILE specify the prefix used for all executables used
 357 # during compilation. Only gcc and related bin-utils executables
 358 # are prefixed with $(CROSS_COMPILE).
 359 # CROSS_COMPILE can be set on the command line
 360 # make CROSS_COMPILE=ia64-linux-
 361 # Alternatively CROSS_COMPILE can be set in the environment.
 362 # Default value for CROSS_COMPILE is not to prefix executables
 363 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 364 ARCH            ?= $(SUBARCH)
 365
 366 # Architecture as present in compile.h
 367 UTS_MACHINE     := $(ARCH)
 368 SRCARCH         := $(ARCH)
 369
 370 # Additional ARCH settings for x86
 371 ifeq ($(ARCH),i386)
 372         SRCARCH := x86
 373 endif
 374 ifeq ($(ARCH),x86_64)
 375         SRCARCH := x86
 376 endif
 377
 378 # Additional ARCH settings for sparc
 379 ifeq ($(ARCH),sparc32)
 380        SRCARCH := sparc
 381 endif
 382 ifeq ($(ARCH),sparc64)
 383        SRCARCH := sparc
 384 endif
 385
 386 # Additional ARCH settings for sh
 387 ifeq ($(ARCH),sh64)
 388        SRCARCH := sh
 389 endif
 390
 391 KCONFIG_CONFIG  ?= .config
 392 export KCONFIG_CONFIG
 393
 394 # SHELL used by kbuild
 395 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 396           else if [ -x /bin/bash ]; then echo /bin/bash; \
 397           else echo sh; fi ; fi)
 398
 399 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 400 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 401 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 402
 403 HOSTCC       = gcc
 404 HOSTCXX      = g++
 405 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 406                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 407                 $(HOSTCFLAGS)
 408 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 409 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 410 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 411
 412 # Make variables (CC, etc...)
 413 AS              = $(CROSS_COMPILE)as
 414 LD              = $(CROSS_COMPILE)ld
 415 CC              = $(CROSS_COMPILE)gcc
 416 CPP             = $(CC) -E
 417 AR              = $(CROSS_COMPILE)ar
 418 NM              = $(CROSS_COMPILE)nm
 419 STRIP           = $(CROSS_COMPILE)strip
 420 OBJCOPY         = $(CROSS_COMPILE)objcopy
 421 OBJDUMP         = $(CROSS_COMPILE)objdump
 422 OBJSIZE         = $(CROSS_COMPILE)size
 423 PAHOLE          = pahole
 424 LEX             = flex
 425 YACC            = bison
 426 AWK             = awk
 427 INSTALLKERNEL  := installkernel
 428 DEPMOD          = /sbin/depmod
 429 PERL            = perl
 430 PYTHON          = python
 431 PYTHON2         = python2
 432 PYTHON3         = python3
 433 CHECK           = sparse
 434
 435 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 436                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 437 NOSTDINC_FLAGS :=
 438 CFLAGS_MODULE   =
 439 AFLAGS_MODULE   =
 440 LDFLAGS_MODULE  =
 441 CFLAGS_KERNEL   =
 442 AFLAGS_KERNEL   =
 443 LDFLAGS_vmlinux =
 444
 445 # Use USERINCLUDE when you must reference the UAPI directories only.
 446 USERINCLUDE    := \
 447                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 448                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 449                 -I$(srctree)/include/uapi \
 450                 -I$(objtree)/include/generated/uapi \
 451                 -include $(srctree)/include/linux/kconfig.h
 452
 453 # Use LINUXINCLUDE when you must reference the include/ directory.
 454 # Needed to be compatible with the O= option
 455 LINUXINCLUDE    := \
 456                 -I$(srctree)/arch/$(SRCARCH)/include \
 457                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 458                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 459                 -I$(objtree)/include \
 460                 $(USERINCLUDE)
 461
 462 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 463 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 464                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 465                    -Werror=implicit-function-declaration -Werror=implicit-int \
 466                    -Wno-format-security \
 467                    -std=gnu89
 468 KBUILD_CPPFLAGS := -D__KERNEL__
 469 KBUILD_AFLAGS_KERNEL :=
 470 KBUILD_CFLAGS_KERNEL :=
 471 KBUILD_AFLAGS_MODULE  := -DMODULE
 472 KBUILD_CFLAGS_MODULE  := -DMODULE
 473 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 474 KBUILD_LDFLAGS :=
 475 GCC_PLUGINS_CFLAGS :=
 476 CLANG_FLAGS :=
 477
 478 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 479 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
 480 export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 481 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 482
 483 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 484 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 485 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 486 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 487 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 488 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 489 export KBUILD_ARFLAGS
 490
 491 # Files to ignore in find ... statements
 492
 493 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 494                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 495                           -prune -o
 496 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 497                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 498
 499 # ===========================================================================
 500 # Rules shared between *config targets and build targets
 501
 502 # Basic helpers built in scripts/basic/
 503 PHONY += scripts_basic
 504 scripts_basic:
 505         $(Q)$(MAKE) $(build)=scripts/basic
 506         $(Q)rm -f .tmp_quiet_recordmcount
 507
 508 PHONY += outputmakefile
 509 # outputmakefile generates a Makefile in the output directory, if using a
 510 # separate output directory. This allows convenient use of make in the
 511 # output directory.
 512 # At the same time when output Makefile generated, generate .gitignore to
 513 # ignore whole output directory
 514 outputmakefile:
 515 ifdef building_out_of_srctree
 516         $(Q)ln -fsn $(srctree) source
 517         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 518         $(Q)test -e .gitignore || \
 519         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 520 endif
 521
 522 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 523 ifneq ($(CROSS_COMPILE),)
 524 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 525 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 526 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 527 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 528 endif
 529 ifneq ($(GCC_TOOLCHAIN),)
 530 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 531 endif
 532 ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
 533 CLANG_FLAGS     += -no-integrated-as
 534 endif
 535 CLANG_FLAGS     += -Werror=unknown-warning-option
 536 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 537 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 538 export CLANG_FLAGS
 539 endif
 540
 541 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 542 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 543 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 544 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 545 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 546
 547 ifeq ($(config-targets),1)
 548 # ===========================================================================
 549 # *config targets only - make sure prerequisites are updated, and descend
 550 # in scripts/kconfig to make the *config target
 551
 552 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 553 # KBUILD_DEFCONFIG may point out an alternative default configuration
 554 # used for 'make defconfig'
 555 include arch/$(SRCARCH)/Makefile
 556 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 557
 558 config: scripts_basic outputmakefile FORCE
 559         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 560
 561 %config: scripts_basic outputmakefile FORCE
 562         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 563
 564 else
 565 # ===========================================================================
 566 # Build targets only - this includes vmlinux, arch specific targets, clean
 567 # targets and others. In general all targets except *config targets.
 568
 569 # If building an external module we do not care about the all: rule
 570 # but instead _all depend on modules
 571 PHONY += all
 572 ifeq ($(KBUILD_EXTMOD),)
 573 _all: all
 574 else
 575 _all: modules
 576 endif
 577
 578 # Decide whether to build built-in, modular, or both.
 579 # Normally, just do built-in.
 580
 581 KBUILD_MODULES :=
 582 KBUILD_BUILTIN := 1
 583
 584 # If we have only "make modules", don't compile built-in objects.
 585 # When we're building modules with modversions, we need to consider
 586 # the built-in objects during the descend as well, in order to
 587 # make sure the checksums are up to date before we record them.
 588
 589 ifeq ($(MAKECMDGOALS),modules)
 590   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 591 endif
 592
 593 # If we have "make <whatever> modules", compile modules
 594 # in addition to whatever we do anyway.
 595 # Just "make" or "make all" shall build modules as well
 596
 597 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 598   KBUILD_MODULES := 1
 599 endif
 600
 601 ifeq ($(MAKECMDGOALS),)
 602   KBUILD_MODULES := 1
 603 endif
 604
 605 export KBUILD_MODULES KBUILD_BUILTIN
 606
 607 ifeq ($(dot-config),1)
 608 include include/config/auto.conf
 609 endif
 610
 611 ifeq ($(KBUILD_EXTMOD),)
 612 # Objects we will link into vmlinux / subdirs we need to visit
 613 init-y          := init/
 614 drivers-y       := drivers/ sound/
 615 drivers-$(CONFIG_SAMPLES) += samples/
 616 drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
 617 net-y           := net/
 618 libs-y          := lib/
 619 core-y          := usr/
 620 virt-y          := virt/
 621 endif # KBUILD_EXTMOD
 622
 623 # The all: target is the default when no target is given on the
 624 # command line.
 625 # This allow a user to issue only 'make' to build a kernel including modules
 626 # Defaults to vmlinux, but the arch makefile usually adds further targets
 627 all: vmlinux
 628
 629 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 630         $(call cc-option,-fno-tree-loop-im) \
 631         $(call cc-disable-warning,maybe-uninitialized,)
 632 export CFLAGS_GCOV
 633
 634 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 635 ifdef CONFIG_FUNCTION_TRACER
 636   CC_FLAGS_FTRACE := -pg
 637 endif
 638
 639 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 640 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 641 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 642 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 643 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 644 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 645 export RETPOLINE_CFLAGS
 646 export RETPOLINE_VDSO_CFLAGS
 647
 648 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 649 # values of the respective KBUILD_* variables
 650 ARCH_CPPFLAGS :=
 651 ARCH_AFLAGS :=
 652 ARCH_CFLAGS :=
 653 include arch/$(SRCARCH)/Makefile
 654
 655 ifeq ($(dot-config),1)
 656 ifeq ($(may-sync-config),1)
 657 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 658 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 659 # because some architectures define CROSS_COMPILE there.
 660 include include/config/auto.conf.cmd
 661
 662 $(KCONFIG_CONFIG):
 663         @echo >&2 '***'
 664         @echo >&2 '*** Configuration file "$@" not found!'
 665         @echo >&2 '***'
 666         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 667         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 668         @echo >&2 '***'
 669         @/bin/false
 670
 671 # The actual configuration files used during the build are stored in
 672 # include/generated/ and include/config/. Update them if .config is newer than
 673 # include/config/auto.conf (which mirrors .config).
 674 #
 675 # This exploits the 'multi-target pattern rule' trick.
 676 # The syncconfig should be executed only once to make all the targets.
 677 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 678         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 679 else
 680 # External modules and some install targets need include/generated/autoconf.h
 681 # and include/config/auto.conf but do not care if they are up-to-date.
 682 # Use auto.conf to trigger the test
 683 PHONY += include/config/auto.conf
 684
 685 include/config/auto.conf:
 686         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 687         echo >&2;                                                       \
 688         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 689         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 690         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 691         echo >&2 ;                                                      \
 692         /bin/false)
 693
 694 endif # may-sync-config
 695 endif # $(dot-config)
 696
 697 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 698 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 699 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 700 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 701 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 702
 703 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 704 KBUILD_CFLAGS   += -Os
 705 else
 706 KBUILD_CFLAGS   += -O2
 707 endif
 708
 709 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
 710 KBUILD_CFLAGS   += -Wno-maybe-uninitialized
 711 endif
 712
 713 # Tell gcc to never replace conditional load with a non-conditional one
 714 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 715
 716 include scripts/Makefile.kcov
 717 include scripts/Makefile.gcc-plugins
 718
 719 ifdef CONFIG_READABLE_ASM
 720 # Disable optimizations that make assembler listings hard to read.
 721 # reorder blocks reorders the control in the function
 722 # ipa clone creates specialized cloned functions
 723 # partial inlining inlines only parts of functions
 724 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 725                  $(call cc-option,-fno-ipa-cp-clone,) \
 726                  $(call cc-option,-fno-partial-inlining)
 727 endif
 728
 729 ifneq ($(CONFIG_FRAME_WARN),0)
 730 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 731 endif
 732
 733 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 734 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 735 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 736
 737 KBUILD_CFLAGS += $(stackp-flags-y)
 738
 739 ifdef CONFIG_CC_IS_CLANG
 740 KBUILD_CPPFLAGS += -Qunused-arguments
 741 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 742 KBUILD_CFLAGS += -Wno-gnu
 743 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 744 KBUILD_CFLAGS += -Wno-tautological-compare
 745 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 746 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 747 # See modpost pattern 2
 748 KBUILD_CFLAGS += -mno-global-merge
 749 else
 750
 751 # These warnings generated too much noise in a regular build.
 752 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 753 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 754 endif
 755
 756 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 757 ifdef CONFIG_FRAME_POINTER
 758 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 759 else
 760 # Some targets (ARM with Thumb2, for example), can't be built with frame
 761 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 762 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 763 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 764 # -fomit-frame-pointer with FUNCTION_TRACER.
 765 ifndef CONFIG_FUNCTION_TRACER
 766 KBUILD_CFLAGS   += -fomit-frame-pointer
 767 endif
 768 endif
 769
 770 # Initialize all stack variables with a pattern, if desired.
 771 ifdef CONFIG_INIT_STACK_ALL
 772 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 773 endif
 774
 775 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 776
 777 ifdef CONFIG_DEBUG_INFO
 778 ifdef CONFIG_DEBUG_INFO_SPLIT
 779 DEBUG_CFLAGS    += -gsplit-dwarf
 780 else
 781 DEBUG_CFLAGS    += -g
 782 endif
 783 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 784 endif
 785 ifdef CONFIG_DEBUG_INFO_DWARF4
 786 DEBUG_CFLAGS    += -gdwarf-4
 787 endif
 788
 789 ifdef CONFIG_DEBUG_INFO_REDUCED
 790 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 791                    $(call cc-option,-fno-var-tracking)
 792 endif
 793
 794 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 795 export DEBUG_CFLAGS
 796
 797 ifdef CONFIG_FUNCTION_TRACER
 798 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 799   # gcc 5 supports generating the mcount tables directly
 800   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 801     CC_FLAGS_FTRACE     += -mrecord-mcount
 802     export CC_USING_RECORD_MCOUNT := 1
 803   endif
 804   ifdef CONFIG_HAVE_NOP_MCOUNT
 805     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 806       CC_FLAGS_FTRACE   += -mnop-mcount
 807       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 808     endif
 809   endif
 810 endif
 811 ifdef CONFIG_HAVE_FENTRY
 812   ifeq ($(call cc-option-yn, -mfentry),y)
 813     CC_FLAGS_FTRACE     += -mfentry
 814     CC_FLAGS_USING      += -DCC_USING_FENTRY
 815   endif
 816 endif
 817 export CC_FLAGS_FTRACE
 818 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 819 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 820 ifdef CONFIG_DYNAMIC_FTRACE
 821         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 822                 BUILD_C_RECORDMCOUNT := y
 823                 export BUILD_C_RECORDMCOUNT
 824         endif
 825 endif
 826 endif
 827
 828 # We trigger additional mismatches with less inlining
 829 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 830 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 831 endif
 832
 833 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 834 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 835 LDFLAGS_vmlinux += --gc-sections
 836 endif
 837
 838 ifdef CONFIG_LIVEPATCH
 839 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 840 endif
 841
 842 # arch Makefile may override CC so keep this after arch Makefile is included
 843 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 844
 845 # warn about C99 declaration after statement
 846 KBUILD_CFLAGS += -Wdeclaration-after-statement
 847
 848 # Warn about unmarked fall-throughs in switch statement.
 849 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 850
 851 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 852 KBUILD_CFLAGS += -Wvla
 853
 854 # disable pointer signed / unsigned warnings in gcc 4.0
 855 KBUILD_CFLAGS += -Wno-pointer-sign
 856
 857 # disable stringop warnings in gcc 8+
 858 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 859
 860 # disable invalid "can't wrap" optimizations for signed / pointers
 861 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 862
 863 # clang sets -fmerge-all-constants by default as optimization, but this
 864 # is non-conforming behavior for C and in fact breaks the kernel, so we
 865 # need to disable it here generally.
 866 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 867
 868 # for gcc -fno-merge-all-constants disables everything, but it is fine
 869 # to have actual conforming behavior enabled.
 870 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 871
 872 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 873 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 874
 875 # conserve stack if available
 876 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 877
 878 # Prohibit date/time macros, which would make the build non-deterministic
 879 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 880
 881 # enforce correct pointer usage
 882 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 883
 884 # Require designated initializers for all marked structures
 885 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 886
 887 # change __FILE__ to the relative path from the srctree
 888 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 889
 890 # ensure -fcf-protection is disabled when using retpoline as it is
 891 # incompatible with -mindirect-branch=thunk-extern
 892 ifdef CONFIG_RETPOLINE
 893 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 894 endif
 895
 896 # use the deterministic mode of AR if available
 897 KBUILD_ARFLAGS := $(call ar-option,D)
 898
 899 include scripts/Makefile.kasan
 900 include scripts/Makefile.extrawarn
 901 include scripts/Makefile.ubsan
 902
 903 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 904 # last assignments
 905 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 906 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 907 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 908
 909 KBUILD_LDFLAGS_MODULE += --build-id
 910 LDFLAGS_vmlinux += --build-id
 911
 912 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 913 LDFLAGS_vmlinux += $(call ld-option, -X,)
 914 endif
 915
 916 ifeq ($(CONFIG_RELR),y)
 917 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
 918 endif
 919
 920 # insure the checker run with the right endianness
 921 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 922
 923 # the checker needs the correct machine size
 924 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 925
 926 # Default kernel image to build when no specific target is given.
 927 # KBUILD_IMAGE may be overruled on the command line or
 928 # set in the environment
 929 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 930 # this default value
 931 export KBUILD_IMAGE ?= vmlinux
 932
 933 #
 934 # INSTALL_PATH specifies where to place the updated kernel and system map
 935 # images. Default is /boot, but you can set it to other values
 936 export  INSTALL_PATH ?= /boot
 937
 938 #
 939 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 940 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 941 # an argument if needed. Otherwise it defaults to the kernel install path
 942 #
 943 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 944
 945 #
 946 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 947 # relocations required by build roots.  This is not defined in the
 948 # makefile but the argument can be passed to make if needed.
 949 #
 950
 951 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 952 export MODLIB
 953
 954 #
 955 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 956 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 957 # the default option --strip-debug will be used.  Otherwise,
 958 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 959
 960 ifdef INSTALL_MOD_STRIP
 961 ifeq ($(INSTALL_MOD_STRIP),1)
 962 mod_strip_cmd = $(STRIP) --strip-debug
 963 else
 964 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 965 endif # INSTALL_MOD_STRIP=1
 966 else
 967 mod_strip_cmd = true
 968 endif # INSTALL_MOD_STRIP
 969 export mod_strip_cmd
 970
 971 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 972 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 973 # or CONFIG_MODULE_COMPRESS_XZ.
 974
 975 mod_compress_cmd = true
 976 ifdef CONFIG_MODULE_COMPRESS
 977   ifdef CONFIG_MODULE_COMPRESS_GZIP
 978     mod_compress_cmd = gzip -n -f
 979   endif # CONFIG_MODULE_COMPRESS_GZIP
 980   ifdef CONFIG_MODULE_COMPRESS_XZ
 981     mod_compress_cmd = xz -f
 982   endif # CONFIG_MODULE_COMPRESS_XZ
 983 endif # CONFIG_MODULE_COMPRESS
 984 export mod_compress_cmd
 985
 986 ifdef CONFIG_MODULE_SIG_ALL
 987 $(eval $(call config_filename,MODULE_SIG_KEY))
 988
 989 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 990 else
 991 mod_sign_cmd = true
 992 endif
 993 export mod_sign_cmd
 994
 995 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 996
 997 ifdef CONFIG_STACK_VALIDATION
 998   has_libelf := $(call try-run,\
 999                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1000   ifeq ($(has_libelf),1)
1001     objtool_target := tools/objtool FORCE
1002   else
1003     SKIP_STACK_VALIDATION := 1
1004     export SKIP_STACK_VALIDATION
1005   endif
1006 endif
1007
1008 PHONY += prepare0
1009
1010 export MODORDER := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order
1011
1012 ifeq ($(KBUILD_EXTMOD),)
1013 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1014
1015 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1016                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1017                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1018
1019 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1020                      $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1021                         $(drivers-) $(net-) $(libs-) $(virt-))))
1022
1023 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1024 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1025 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1026 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1027 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1028 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1029 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1030
1031 # Externally visible symbols (used by link-vmlinux.sh)
1032 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1033                               $(drivers-y) $(net-y) $(virt-y)
1034 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1035 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1036 export LDFLAGS_vmlinux
1037 # used by scripts/package/Makefile
1038 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1039
1040 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1041
1042 # Recurse until adjust_autoksyms.sh is satisfied
1043 PHONY += autoksyms_recursive
1044 ifdef CONFIG_TRIM_UNUSED_KSYMS
1045 autoksyms_recursive: $(vmlinux-deps) modules.order
1046         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1047           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1048 endif
1049
1050 # For the kernel to actually contain only the needed exported symbols,
1051 # we have to build modules as well to determine what those symbols are.
1052 # (this can be evaluated only once include/config/auto.conf has been included)
1053 ifdef CONFIG_TRIM_UNUSED_KSYMS
1054   KBUILD_MODULES := 1
1055 endif
1056
1057 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1058
1059 $(autoksyms_h):
1060         $(Q)mkdir -p $(dir $@)
1061         $(Q)touch $@
1062
1063 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1064
1065 # Final link of vmlinux with optional arch pass after final link
1066 cmd_link-vmlinux =                                                 \
1067         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1068         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1069
1070 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1071         +$(call if_changed,link-vmlinux)
1072
1073 targets := vmlinux
1074
1075 # The actual objects are generated when descending,
1076 # make sure no implicit rule kicks in
1077 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1078
1079 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1080 # Preset locale variables to speed up the build process. Limit locale
1081 # tweaks to this spot to avoid wrong language settings when running
1082 # make menuconfig etc.
1083 # Error messages still appears in the original language
1084
1085 PHONY += $(vmlinux-dirs)
1086 $(vmlinux-dirs): prepare
1087         $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1
1088
1089 filechk_kernel.release = \
1090         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1091
1092 # Store (new) KERNELRELEASE string in include/config/kernel.release
1093 include/config/kernel.release: FORCE
1094         $(call filechk,kernel.release)
1095
1096 # Additional helpers built in scripts/
1097 # Carefully list dependencies so we do not try to build scripts twice
1098 # in parallel
1099 PHONY += scripts
1100 scripts: scripts_basic scripts_dtc
1101         $(Q)$(MAKE) $(build)=$(@)
1102
1103 # Things we need to do before we recursively start building the kernel
1104 # or the modules are listed in "prepare".
1105 # A multi level approach is used. prepareN is processed before prepareN-1.
1106 # archprepare is used in arch Makefiles and when processed asm symlink,
1107 # version.h and scripts_basic is processed / created.
1108
1109 PHONY += prepare archprepare prepare3
1110
1111 # prepare3 is used to check if we are building in a separate output directory,
1112 # and if so do:
1113 # 1) Check that make has not been executed in the kernel src $(srctree)
1114 prepare3: include/config/kernel.release
1115 ifdef building_out_of_srctree
1116         @$(kecho) '  Using $(srctree) as source for kernel'
1117         $(Q)if [ -f $(srctree)/.config -o \
1118                  -d $(srctree)/include/config -o \
1119                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1120                 echo >&2 "  $(srctree) is not clean, please run 'make ARCH=$(ARCH) mrproper'"; \
1121                 echo >&2 "  in the '$(srctree)' directory.";\
1122                 /bin/false; \
1123         fi;
1124 endif
1125
1126 archprepare: archheaders archscripts scripts prepare3 outputmakefile \
1127         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1128
1129 prepare0: archprepare
1130         $(Q)$(MAKE) $(build)=scripts/mod
1131         $(Q)$(MAKE) $(build)=.
1132
1133 # All the preparing..
1134 prepare: prepare0 prepare-objtool
1135
1136 # Support for using generic headers in asm-generic
1137 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1138
1139 PHONY += asm-generic uapi-asm-generic
1140 asm-generic: uapi-asm-generic
1141         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1142         generic=include/asm-generic
1143 uapi-asm-generic:
1144         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1145         generic=include/uapi/asm-generic
1146
1147 PHONY += prepare-objtool
1148 prepare-objtool: $(objtool_target)
1149 ifeq ($(SKIP_STACK_VALIDATION),1)
1150 ifdef CONFIG_UNWINDER_ORC
1151         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1152         @false
1153 else
1154         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1155 endif
1156 endif
1157
1158 # Generate some files
1159 # ---------------------------------------------------------------------------
1160
1161 # KERNELRELEASE can change from a few different places, meaning version.h
1162 # needs to be updated, so this check is forced on all builds
1163
1164 uts_len := 64
1165 define filechk_utsrelease.h
1166         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1167           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1168           exit 1;                                                         \
1169         fi;                                                               \
1170         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1171 endef
1172
1173 define filechk_version.h
1174         echo \#define LINUX_VERSION_CODE $(shell                         \
1175         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1176         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1177 endef
1178
1179 $(version_h): FORCE
1180         $(call filechk,version.h)
1181         $(Q)rm -f $(old_version_h)
1182
1183 include/generated/utsrelease.h: include/config/kernel.release FORCE
1184         $(call filechk,utsrelease.h)
1185
1186 PHONY += headerdep
1187 headerdep:
1188         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1189         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1190
1191 # ---------------------------------------------------------------------------
1192 # Kernel headers
1193
1194 #Default location for installed headers
1195 export INSTALL_HDR_PATH = $(objtree)/usr
1196
1197 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1198       cmd_headers_install = \
1199         mkdir -p $(INSTALL_HDR_PATH); \
1200         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1201         usr/include $(INSTALL_HDR_PATH)
1202
1203 PHONY += headers_install
1204 headers_install: headers
1205         $(call cmd,headers_install)
1206
1207 PHONY += archheaders archscripts
1208
1209 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1210
1211 PHONY += headers
1212 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1213         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1214           $(error Headers not exportable for the $(SRCARCH) architecture))
1215         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1216         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1217
1218 PHONY += headers_check
1219 headers_check: headers
1220         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1221         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1222
1223 ifdef CONFIG_HEADERS_INSTALL
1224 prepare: headers
1225 endif
1226
1227 ifdef CONFIG_HEADERS_CHECK
1228 all: headers_check
1229 endif
1230
1231 PHONY += scripts_unifdef
1232 scripts_unifdef: scripts_basic
1233         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1234
1235 # ---------------------------------------------------------------------------
1236 # Kernel selftest
1237
1238 PHONY += kselftest
1239 kselftest:
1240         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1241
1242 PHONY += kselftest-clean
1243 kselftest-clean:
1244         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1245
1246 PHONY += kselftest-merge
1247 kselftest-merge:
1248         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1249         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1250                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1251         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1252
1253 # ---------------------------------------------------------------------------
1254 # Devicetree files
1255
1256 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1257 dtstree := arch/$(SRCARCH)/boot/dts
1258 endif
1259
1260 ifneq ($(dtstree),)
1261
1262 %.dtb: prepare3 scripts_dtc
1263         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1264
1265 PHONY += dtbs dtbs_install dt_binding_check
1266 dtbs dtbs_check: prepare3 scripts_dtc
1267         $(Q)$(MAKE) $(build)=$(dtstree)
1268
1269 dtbs_check: export CHECK_DTBS=1
1270 dtbs_check: dt_binding_check
1271
1272 dtbs_install:
1273         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1274
1275 ifdef CONFIG_OF_EARLY_FLATTREE
1276 all: dtbs
1277 endif
1278
1279 endif
1280
1281 PHONY += scripts_dtc
1282 scripts_dtc: scripts_basic
1283         $(Q)$(MAKE) $(build)=scripts/dtc
1284
1285 dt_binding_check: scripts_dtc
1286         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1287
1288 # ---------------------------------------------------------------------------
1289 # Modules
1290
1291 ifdef CONFIG_MODULES
1292
1293 # By default, build modules as well
1294
1295 all: modules
1296
1297 # Build modules
1298 #
1299 # A module can be listed more than once in obj-m resulting in
1300 # duplicate lines in modules.order files.  Those are removed
1301 # using awk while concatenating to the final file.
1302
1303 PHONY += modules
1304 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1305         @$(kecho) '  Building modules, stage 2.';
1306         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1307         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1308
1309 modules.order: $(vmlinux-dirs)
1310         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1311
1312 modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs))
1313
1314 modules.builtin: $(modbuiltin-dirs)
1315         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1316
1317 PHONY += $(modbuiltin-dirs)
1318 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1319 # here to make it self-healing in case somebody accidentally removes it.
1320 $(modbuiltin-dirs): include/config/tristate.conf
1321         $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1322
1323 # Target to prepare building external modules
1324 PHONY += modules_prepare
1325 modules_prepare: prepare
1326
1327 # Target to install modules
1328 PHONY += modules_install
1329 modules_install: _modinst_ _modinst_post
1330
1331 PHONY += _modinst_
1332 _modinst_:
1333         @rm -rf $(MODLIB)/kernel
1334         @rm -f $(MODLIB)/source
1335         @mkdir -p $(MODLIB)/kernel
1336         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1337         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1338                 rm -f $(MODLIB)/build ; \
1339                 ln -s $(CURDIR) $(MODLIB)/build ; \
1340         fi
1341         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1342         @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1343         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1344         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1345
1346 # This depmod is only for convenience to give the initial
1347 # boot a modules.dep even before / is mounted read-write.  However the
1348 # boot script depmod is the master version.
1349 PHONY += _modinst_post
1350 _modinst_post: _modinst_
1351         $(call cmd,depmod)
1352
1353 ifeq ($(CONFIG_MODULE_SIG), y)
1354 PHONY += modules_sign
1355 modules_sign:
1356         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1357 endif
1358
1359 else # CONFIG_MODULES
1360
1361 # Modules not configured
1362 # ---------------------------------------------------------------------------
1363
1364 PHONY += modules modules_install
1365 modules modules_install:
1366         @echo >&2
1367         @echo >&2 "The present kernel configuration has modules disabled."
1368         @echo >&2 "Type 'make config' and enable loadable module support."
1369         @echo >&2 "Then build a kernel with module support enabled."
1370         @echo >&2
1371         @exit 1
1372
1373 endif # CONFIG_MODULES
1374
1375 ###
1376 # Cleaning is done on three levels.
1377 # make clean     Delete most generated files
1378 #                Leave enough to build external modules
1379 # make mrproper  Delete the current configuration, and all generated files
1380 # make distclean Remove editor backup files, patch leftover files and the like
1381
1382 # Directories & files removed with 'make clean'
1383 CLEAN_DIRS  += include/ksym
1384 CLEAN_FILES += modules.builtin.modinfo
1385
1386 # Directories & files removed with 'make mrproper'
1387 MRPROPER_DIRS  += include/config include/generated          \
1388                   arch/$(SRCARCH)/include/generated .tmp_objdiff
1389 MRPROPER_FILES += .config .config.old .version \
1390                   Module.symvers \
1391                   signing_key.pem signing_key.priv signing_key.x509     \
1392                   x509.genkey extra_certificates signing_key.x509.keyid \
1393                   signing_key.x509.signer vmlinux-gdb.py
1394
1395 # Directories & files removed with 'make distclean'
1396 DISTCLEAN_DIRS  +=
1397 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1398
1399 # clean - Delete most, but leave enough to build external modules
1400 #
1401 clean: rm-dirs  := $(CLEAN_DIRS)
1402 clean: rm-files := $(CLEAN_FILES)
1403 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs))
1404
1405 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1406 $(clean-dirs):
1407         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1408
1409 vmlinuxclean:
1410         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1411         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1412
1413 clean: archclean vmlinuxclean
1414
1415 # mrproper - Delete all generated files, including .config
1416 #
1417 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1418 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1419 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1420
1421 PHONY += $(mrproper-dirs) mrproper
1422 $(mrproper-dirs):
1423         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1424
1425 mrproper: clean $(mrproper-dirs)
1426         $(call cmd,rmdirs)
1427         $(call cmd,rmfiles)
1428
1429 # distclean
1430 #
1431 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1432 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1433
1434 PHONY += distclean
1435
1436 distclean: mrproper
1437         $(call cmd,rmdirs)
1438         $(call cmd,rmfiles)
1439         @find $(srctree) $(RCS_FIND_IGNORE) \
1440                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1441                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1442                 -o -name 'core' \) \
1443                 -type f -print | xargs rm -f
1444
1445
1446 # Packaging of the kernel to various formats
1447 # ---------------------------------------------------------------------------
1448 package-dir     := scripts/package
1449
1450 %src-pkg: FORCE
1451         $(Q)$(MAKE) $(build)=$(package-dir) $@
1452 %pkg: include/config/kernel.release FORCE
1453         $(Q)$(MAKE) $(build)=$(package-dir) $@
1454
1455
1456 # Brief documentation of the typical targets used
1457 # ---------------------------------------------------------------------------
1458
1459 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1460 boards := $(sort $(notdir $(boards)))
1461 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1462 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1463
1464 PHONY += help
1465 help:
1466         @echo  'Cleaning targets:'
1467         @echo  '  clean           - Remove most generated files but keep the config and'
1468         @echo  '                    enough build support to build external modules'
1469         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1470         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1471         @echo  ''
1472         @echo  'Configuration targets:'
1473         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1474         @echo  ''
1475         @echo  'Other generic targets:'
1476         @echo  '  all             - Build all targets marked with [*]'
1477         @echo  '* vmlinux         - Build the bare kernel'
1478         @echo  '* modules         - Build all modules'
1479         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1480         @echo  '  dir/            - Build all files in dir and below'
1481         @echo  '  dir/file.[ois]  - Build specified target only'
1482         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1483         @echo  '                    (requires compiler support for LLVM assembly generation)'
1484         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1485         @echo  '                    (requires a recent binutils and recent build (System.map))'
1486         @echo  '  dir/file.ko     - Build module including final link'
1487         @echo  '  modules_prepare - Set up for building external modules'
1488         @echo  '  tags/TAGS       - Generate tags file for editors'
1489         @echo  '  cscope          - Generate cscope index'
1490         @echo  '  gtags           - Generate GNU GLOBAL index'
1491         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1492         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1493         @echo  '  image_name      - Output the image name (use with make -s)'
1494         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1495          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1496          echo  ''
1497         @echo  'Static analysers:'
1498         @echo  '  checkstack      - Generate a list of stack hogs'
1499         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1500         @echo  '  versioncheck    - Sanity check on version.h usage'
1501         @echo  '  includecheck    - Check for duplicate included header files'
1502         @echo  '  export_report   - List the usages of all exported symbols'
1503         @echo  '  headers_check   - Sanity check on exported headers'
1504         @echo  '  headerdep       - Detect inclusion cycles in headers'
1505         @echo  '  coccicheck      - Check with Coccinelle'
1506         @echo  ''
1507         @echo  'Kernel selftest:'
1508         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1509         @echo  '                    Build, install, and boot kernel before'
1510         @echo  '                    running kselftest on it'
1511         @echo  '  kselftest-clean - Remove all generated kselftest files'
1512         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1513         @echo  '                    .config.'
1514         @echo  ''
1515         @$(if $(dtstree), \
1516                 echo 'Devicetree:'; \
1517                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1518                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1519                 echo '  dt_binding_check - Validate device tree binding documents'; \
1520                 echo '  dtbs_check       - Validate device tree source files';\
1521                 echo '')
1522
1523         @echo 'Userspace tools targets:'
1524         @echo '  use "make tools/help"'
1525         @echo '  or  "cd tools; make help"'
1526         @echo  ''
1527         @echo  'Kernel packaging:'
1528         @$(MAKE) $(build)=$(package-dir) help
1529         @echo  ''
1530         @echo  'Documentation targets:'
1531         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1532         @echo  ''
1533         @echo  'Architecture specific targets ($(SRCARCH)):'
1534         @$(if $(archhelp),$(archhelp),\
1535                 echo '  No architecture specific help defined for $(SRCARCH)')
1536         @echo  ''
1537         @$(if $(boards), \
1538                 $(foreach b, $(boards), \
1539                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1540                 echo '')
1541         @$(if $(board-dirs), \
1542                 $(foreach b, $(board-dirs), \
1543                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1544                 printf "  %-16s - Show all of the above\\n" help-boards; \
1545                 echo '')
1546
1547         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1548         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1549         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1550         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1551         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1552         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1553         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1554         @echo  '                1: warnings which may be relevant and do not occur too often'
1555         @echo  '                2: warnings which occur quite often but may still be relevant'
1556         @echo  '                3: more obscure warnings, can most likely be ignored'
1557         @echo  '                Multiple levels can be combined with W=12 or W=123'
1558         @echo  ''
1559         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1560         @echo  'For further info see the ./README file'
1561
1562
1563 help-board-dirs := $(addprefix help-,$(board-dirs))
1564
1565 help-boards: $(help-board-dirs)
1566
1567 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1568
1569 $(help-board-dirs): help-%:
1570         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1571         @$(if $(boards-per-dir), \
1572                 $(foreach b, $(boards-per-dir), \
1573                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1574                 echo '')
1575
1576
1577 # Documentation targets
1578 # ---------------------------------------------------------------------------
1579 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1580                linkcheckdocs dochelp refcheckdocs
1581 PHONY += $(DOC_TARGETS)
1582 $(DOC_TARGETS): scripts_basic FORCE
1583         $(Q)$(MAKE) $(build)=Documentation $@
1584
1585 # Misc
1586 # ---------------------------------------------------------------------------
1587
1588 PHONY += scripts_gdb
1589 scripts_gdb: prepare0
1590         $(Q)$(MAKE) $(build)=scripts/gdb
1591         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1592
1593 ifdef CONFIG_GDB_SCRIPTS
1594 all: scripts_gdb
1595 endif
1596
1597 else # KBUILD_EXTMOD
1598
1599 ###
1600 # External module support.
1601 # When building external modules the kernel used as basis is considered
1602 # read-only, and no consistency checks are made and the make
1603 # system is not used on the basis kernel. If updates are required
1604 # in the basis kernel ordinary make commands (without M=...) must
1605 # be used.
1606 #
1607 # The following are the only valid targets when building external
1608 # modules.
1609 # make M=dir clean     Delete all automatically generated files
1610 # make M=dir modules   Make all modules in specified dir
1611 # make M=dir           Same as 'make M=dir modules'
1612 # make M=dir modules_install
1613 #                      Install the modules built in the module directory
1614 #                      Assumes install directory is already created
1615
1616 # We are always building modules
1617 KBUILD_MODULES := 1
1618
1619 PHONY += $(objtree)/Module.symvers
1620 $(objtree)/Module.symvers:
1621         @test -e $(objtree)/Module.symvers || ( \
1622         echo; \
1623         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1624         echo "           is missing; modules will have no dependencies and modversions."; \
1625         echo )
1626
1627 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1628 PHONY += $(module-dirs) modules
1629 $(module-dirs): prepare $(objtree)/Module.symvers
1630         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) need-modorder=1
1631
1632 modules: $(module-dirs)
1633         @$(kecho) '  Building modules, stage 2.';
1634         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1635
1636 PHONY += modules_install
1637 modules_install: _emodinst_ _emodinst_post
1638
1639 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1640 PHONY += _emodinst_
1641 _emodinst_:
1642         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1643         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1644
1645 PHONY += _emodinst_post
1646 _emodinst_post: _emodinst_
1647         $(call cmd,depmod)
1648
1649 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1650
1651 PHONY += $(clean-dirs) clean
1652 $(clean-dirs):
1653         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1654
1655 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1656
1657 PHONY += help
1658 help:
1659         @echo  '  Building external modules.'
1660         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1661         @echo  ''
1662         @echo  '  modules         - default target, build the module(s)'
1663         @echo  '  modules_install - install the module'
1664         @echo  '  clean           - remove generated files in module directory only'
1665         @echo  ''
1666
1667 PHONY += prepare
1668 endif # KBUILD_EXTMOD
1669
1670 clean: $(clean-dirs)
1671         $(call cmd,rmdirs)
1672         $(call cmd,rmfiles)
1673         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1674                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1675                 -o -name '*.ko.*' \
1676                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1677                 -o -name '*.dwo' -o -name '*.lst' \
1678                 -o -name '*.su' -o -name '*.mod' \
1679                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1680                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1681                 -o -name '*.asn1.[ch]' \
1682                 -o -name '*.symtypes' -o -name 'modules.order' \
1683                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1684                 -o -name '*.c.[012]*.*' \
1685                 -o -name '*.ll' \
1686                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1687
1688 # Generate tags for editors
1689 # ---------------------------------------------------------------------------
1690 quiet_cmd_tags = GEN     $@
1691       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1692
1693 tags TAGS cscope gtags: FORCE
1694         $(call cmd,tags)
1695
1696 # Scripts to check various things for consistency
1697 # ---------------------------------------------------------------------------
1698
1699 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1700
1701 includecheck:
1702         find $(srctree)/* $(RCS_FIND_IGNORE) \
1703                 -name '*.[hcS]' -type f -print | sort \
1704                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1705
1706 versioncheck:
1707         find $(srctree)/* $(RCS_FIND_IGNORE) \
1708                 -name '*.[hcS]' -type f -print | sort \
1709                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1710
1711 coccicheck:
1712         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1713
1714 namespacecheck:
1715         $(PERL) $(srctree)/scripts/namespace.pl
1716
1717 export_report:
1718         $(PERL) $(srctree)/scripts/export_report.pl
1719
1720 PHONY += checkstack kernelrelease kernelversion image_name
1721
1722 # UML needs a little special treatment here.  It wants to use the host
1723 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1724 # else wants $(ARCH), including people doing cross-builds, which means
1725 # that $(SUBARCH) doesn't work here.
1726 ifeq ($(ARCH), um)
1727 CHECKSTACK_ARCH := $(SUBARCH)
1728 else
1729 CHECKSTACK_ARCH := $(ARCH)
1730 endif
1731 checkstack:
1732         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1733         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1734
1735 kernelrelease:
1736         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1737
1738 kernelversion:
1739         @echo $(KERNELVERSION)
1740
1741 image_name:
1742         @echo $(KBUILD_IMAGE)
1743
1744 # Clear a bunch of variables before executing the submake
1745
1746 ifeq ($(quiet),silent_)
1747 tools_silent=s
1748 endif
1749
1750 tools/: FORCE
1751         $(Q)mkdir -p $(objtree)/tools
1752         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1753
1754 tools/%: FORCE
1755         $(Q)mkdir -p $(objtree)/tools
1756         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1757
1758 # Single targets
1759 # ---------------------------------------------------------------------------
1760 # Single targets are compatible with:
1761 # - build with mixed source and output
1762 # - build with separate output dir 'make O=...'
1763 # - external modules
1764 #
1765 #  target-dir => where to store outputfile
1766 #  build-dir  => directory in kernel source tree to use
1767
1768 build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1769 build-dir = $(patsubst %/,%,$(dir $(build-target)))
1770
1771 %.i: prepare FORCE
1772         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1773 %.ll: prepare FORCE
1774         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1775 %.lst: prepare FORCE
1776         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1777 %.o: prepare FORCE
1778         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1779 %.s: prepare FORCE
1780         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1781 %.symtypes: prepare FORCE
1782         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1783 ifeq ($(KBUILD_EXTMOD),)
1784 # For the single build of an in-tree module, use a temporary file to avoid
1785 # the situation of modules_install installing an invalid modules.order.
1786 %.ko: MODORDER := .modules.tmp
1787 endif
1788 %.ko: prepare FORCE
1789         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target:.ko=.mod)
1790         $(Q)echo $(build-target) > $(MODORDER)
1791         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1792
1793 # Modules
1794 PHONY += /
1795 /: ./
1796
1797 %/: prepare FORCE
1798         $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) need-modorder=1
1799
1800 # FIXME Should go into a make.lib or something
1801 # ===========================================================================
1802
1803 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1804       cmd_rmdirs = rm -rf $(rm-dirs)
1805
1806 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1807       cmd_rmfiles = rm -f $(rm-files)
1808
1809 # Run depmod only if we have System.map and depmod is executable
1810 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1811       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1812                    $(KERNELRELEASE)
1813
1814 # read saved command lines for existing targets
1815 existing-targets := $(wildcard $(sort $(targets)))
1816
1817 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1818
1819 endif   # ifeq ($(config-targets),1)
1820 endif   # ifeq ($(mixed-targets),1)
1821 endif   # need-sub-make
1822
1823 PHONY += FORCE
1824 FORCE:
1825
1826 # Declare the contents of the PHONY variable as phony.  We keep that
1827 # information in a variable so we can use it in if_changed and friends.
1828 .PHONY: $(PHONY)