Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 6
   4 SUBLEVEL = 12
   5 EXTRAVERSION =
   6 NAME = Kleptomaniac Octopus
   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 $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
  72 #
  73 # To put more focus on warnings, be less verbose as default
  74 # Use 'make V=1' to see the full commands
  75
  76 ifeq ("$(origin V)", "command line")
  77   KBUILD_VERBOSE = $(V)
  78 endif
  79 ifndef KBUILD_VERBOSE
  80   KBUILD_VERBOSE = 0
  81 endif
  82
  83 ifeq ($(KBUILD_VERBOSE),1)
  84   quiet =
  85   Q =
  86 else
  87   quiet=quiet_
  88   Q = @
  89 endif
  90
  91 # If the user is running make -s (silent mode), suppress echoing of
  92 # commands
  93
  94 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  95   quiet=silent_
  96 endif
  97
  98 export quiet Q KBUILD_VERBOSE
  99
 100 # Kbuild will save output files in the current working directory.
 101 # This does not need to match to the root of the kernel source tree.
 102 #
 103 # For example, you can do this:
 104 #
 105 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 106 #
 107 # If you want to save output files in a different location, there are
 108 # two syntaxes to specify it.
 109 #
 110 # 1) O=
 111 # Use "make O=dir/to/store/output/files/"
 112 #
 113 # 2) Set KBUILD_OUTPUT
 114 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 115 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 116 #
 117 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 118 # variable.
 119
 120 # Do we want to change the working directory?
 121 ifeq ("$(origin O)", "command line")
 122   KBUILD_OUTPUT := $(O)
 123 endif
 124
 125 ifneq ($(KBUILD_OUTPUT),)
 126 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 127 # expand a shell special character '~'. We use a somewhat tedious way here.
 128 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 129 $(if $(abs_objtree),, \
 130      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 131
 132 # $(realpath ...) resolves symlinks
 133 abs_objtree := $(realpath $(abs_objtree))
 134 else
 135 abs_objtree := $(CURDIR)
 136 endif # ifneq ($(KBUILD_OUTPUT),)
 137
 138 ifeq ($(abs_objtree),$(CURDIR))
 139 # Suppress "Entering directory ..." unless we are changing the work directory.
 140 MAKEFLAGS += --no-print-directory
 141 else
 142 need-sub-make := 1
 143 endif
 144
 145 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 146
 147 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 148 $(error source directory cannot contain spaces or colons)
 149 endif
 150
 151 ifneq ($(abs_srctree),$(abs_objtree))
 152 # Look for make include files relative to root of kernel src
 153 #
 154 # This does not become effective immediately because MAKEFLAGS is re-parsed
 155 # once after the Makefile is read. We need to invoke sub-make.
 156 MAKEFLAGS += --include-dir=$(abs_srctree)
 157 need-sub-make := 1
 158 endif
 159
 160 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 161 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 162 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 163 need-sub-make := 1
 164 # Cancel implicit rules for this Makefile.
 165 $(lastword $(MAKEFILE_LIST)): ;
 166 endif
 167
 168 export abs_srctree abs_objtree
 169 export sub_make_done := 1
 170
 171 ifeq ($(need-sub-make),1)
 172
 173 PHONY += $(MAKECMDGOALS) sub-make
 174
 175 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 176         @:
 177
 178 # Invoke a second make in the output directory, passing relevant variables
 179 sub-make:
 180         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 181
 182 endif # need-sub-make
 183 endif # sub_make_done
 184
 185 # We process the rest of the Makefile if this is the final invocation of make
 186 ifeq ($(need-sub-make),)
 187
 188 # Do not print "Entering directory ...",
 189 # but we want to display it when entering to the output directory
 190 # so that IDEs/editors are able to understand relative filenames.
 191 MAKEFLAGS += --no-print-directory
 192
 193 # Call a source code checker (by default, "sparse") as part of the
 194 # C compilation.
 195 #
 196 # Use 'make C=1' to enable checking of only re-compiled files.
 197 # Use 'make C=2' to enable checking of *all* source files, regardless
 198 # of whether they are re-compiled or not.
 199 #
 200 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 201 # including where to get the "sparse" utility.
 202
 203 ifeq ("$(origin C)", "command line")
 204   KBUILD_CHECKSRC = $(C)
 205 endif
 206 ifndef KBUILD_CHECKSRC
 207   KBUILD_CHECKSRC = 0
 208 endif
 209
 210 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 211 # directory of external module to build. Setting M= takes precedence.
 212 ifeq ("$(origin M)", "command line")
 213   KBUILD_EXTMOD := $(M)
 214 endif
 215
 216 export KBUILD_CHECKSRC KBUILD_EXTMOD
 217
 218 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
 219
 220 ifeq ($(abs_srctree),$(abs_objtree))
 221         # building in the source tree
 222         srctree := .
 223         building_out_of_srctree :=
 224 else
 225         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 226                 # building in a subdirectory of the source tree
 227                 srctree := ..
 228         else
 229                 srctree := $(abs_srctree)
 230         endif
 231         building_out_of_srctree := 1
 232 endif
 233
 234 ifneq ($(KBUILD_ABS_SRCTREE),)
 235 srctree := $(abs_srctree)
 236 endif
 237
 238 objtree         := .
 239 VPATH           := $(srctree)
 240
 241 export building_out_of_srctree srctree objtree VPATH
 242
 243 # To make sure we do not include .config for any of the *config targets
 244 # catch them early, and hand them over to scripts/kconfig/Makefile
 245 # It is allowed to specify more targets when calling make, including
 246 # mixing *config targets and build targets.
 247 # For example 'make oldconfig all'.
 248 # Detect when mixed targets is specified, and make a second invocation
 249 # of make so .config is not included in this case either (for *config).
 250
 251 version_h := include/generated/uapi/linux/version.h
 252 old_version_h := include/linux/version.h
 253
 254 clean-targets := %clean mrproper cleandocs
 255 no-dot-config-targets := $(clean-targets) \
 256                          cscope gtags TAGS tags help% %docs check% coccicheck \
 257                          $(version_h) headers headers_% archheaders archscripts \
 258                          %asm-generic kernelversion %src-pkg
 259 no-sync-config-targets := $(no-dot-config-targets) install %install \
 260                            kernelrelease
 261 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 262
 263 config-build    :=
 264 mixed-build     :=
 265 need-config     := 1
 266 may-sync-config := 1
 267 single-build    :=
 268
 269 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 270         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 271                 need-config :=
 272         endif
 273 endif
 274
 275 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 276         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 277                 may-sync-config :=
 278         endif
 279 endif
 280
 281 ifneq ($(KBUILD_EXTMOD),)
 282         may-sync-config :=
 283 endif
 284
 285 ifeq ($(KBUILD_EXTMOD),)
 286         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 287                 config-build := 1
 288                 ifneq ($(words $(MAKECMDGOALS)),1)
 289                         mixed-build := 1
 290                 endif
 291         endif
 292 endif
 293
 294 # We cannot build single targets and the others at the same time
 295 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 296         single-build := 1
 297         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 298                 mixed-build := 1
 299         endif
 300 endif
 301
 302 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 303 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 304         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 305                 mixed-build := 1
 306         endif
 307 endif
 308
 309 # install and modules_install need also be processed one by one
 310 ifneq ($(filter install,$(MAKECMDGOALS)),)
 311         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 312                 mixed-build := 1
 313         endif
 314 endif
 315
 316 ifdef mixed-build
 317 # ===========================================================================
 318 # We're called with mixed targets (*config and build targets).
 319 # Handle them one by one.
 320
 321 PHONY += $(MAKECMDGOALS) __build_one_by_one
 322
 323 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 324         @:
 325
 326 __build_one_by_one:
 327         $(Q)set -e; \
 328         for i in $(MAKECMDGOALS); do \
 329                 $(MAKE) -f $(srctree)/Makefile $$i; \
 330         done
 331
 332 else # !mixed-build
 333
 334 include scripts/Kbuild.include
 335
 336 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 337 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 338 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 339 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 340
 341 include scripts/subarch.include
 342
 343 # Cross compiling and selecting different set of gcc/bin-utils
 344 # ---------------------------------------------------------------------------
 345 #
 346 # When performing cross compilation for other architectures ARCH shall be set
 347 # to the target architecture. (See arch/* for the possibilities).
 348 # ARCH can be set during invocation of make:
 349 # make ARCH=ia64
 350 # Another way is to have ARCH set in the environment.
 351 # The default ARCH is the host where make is executed.
 352
 353 # CROSS_COMPILE specify the prefix used for all executables used
 354 # during compilation. Only gcc and related bin-utils executables
 355 # are prefixed with $(CROSS_COMPILE).
 356 # CROSS_COMPILE can be set on the command line
 357 # make CROSS_COMPILE=ia64-linux-
 358 # Alternatively CROSS_COMPILE can be set in the environment.
 359 # Default value for CROSS_COMPILE is not to prefix executables
 360 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 361 ARCH            ?= $(SUBARCH)
 362
 363 # Architecture as present in compile.h
 364 UTS_MACHINE     := $(ARCH)
 365 SRCARCH         := $(ARCH)
 366
 367 # Additional ARCH settings for x86
 368 ifeq ($(ARCH),i386)
 369         SRCARCH := x86
 370 endif
 371 ifeq ($(ARCH),x86_64)
 372         SRCARCH := x86
 373 endif
 374
 375 # Additional ARCH settings for sparc
 376 ifeq ($(ARCH),sparc32)
 377        SRCARCH := sparc
 378 endif
 379 ifeq ($(ARCH),sparc64)
 380        SRCARCH := sparc
 381 endif
 382
 383 # Additional ARCH settings for sh
 384 ifeq ($(ARCH),sh64)
 385        SRCARCH := sh
 386 endif
 387
 388 KCONFIG_CONFIG  ?= .config
 389 export KCONFIG_CONFIG
 390
 391 # SHELL used by kbuild
 392 CONFIG_SHELL := sh
 393
 394 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 395 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 396 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 397
 398 HOSTCC       = gcc
 399 HOSTCXX      = g++
 400 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 401                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 402                 $(HOSTCFLAGS)
 403 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 404 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 405 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 406
 407 # Make variables (CC, etc...)
 408 AS              = $(CROSS_COMPILE)as
 409 LD              = $(CROSS_COMPILE)ld
 410 CC              = $(CROSS_COMPILE)gcc
 411 CPP             = $(CC) -E
 412 AR              = $(CROSS_COMPILE)ar
 413 NM              = $(CROSS_COMPILE)nm
 414 STRIP           = $(CROSS_COMPILE)strip
 415 OBJCOPY         = $(CROSS_COMPILE)objcopy
 416 OBJDUMP         = $(CROSS_COMPILE)objdump
 417 OBJSIZE         = $(CROSS_COMPILE)size
 418 READELF         = $(CROSS_COMPILE)readelf
 419 PAHOLE          = pahole
 420 LEX             = flex
 421 YACC            = bison
 422 AWK             = awk
 423 INSTALLKERNEL  := installkernel
 424 DEPMOD          = /sbin/depmod
 425 PERL            = perl
 426 PYTHON          = python
 427 PYTHON3         = python3
 428 CHECK           = sparse
 429 BASH            = bash
 430
 431 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 432                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 433 NOSTDINC_FLAGS :=
 434 CFLAGS_MODULE   =
 435 AFLAGS_MODULE   =
 436 LDFLAGS_MODULE  =
 437 CFLAGS_KERNEL   =
 438 AFLAGS_KERNEL   =
 439 LDFLAGS_vmlinux =
 440
 441 # Use USERINCLUDE when you must reference the UAPI directories only.
 442 USERINCLUDE    := \
 443                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 444                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 445                 -I$(srctree)/include/uapi \
 446                 -I$(objtree)/include/generated/uapi \
 447                 -include $(srctree)/include/linux/kconfig.h
 448
 449 # Use LINUXINCLUDE when you must reference the include/ directory.
 450 # Needed to be compatible with the O= option
 451 LINUXINCLUDE    := \
 452                 -I$(srctree)/arch/$(SRCARCH)/include \
 453                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 454                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 455                 -I$(objtree)/include \
 456                 $(USERINCLUDE)
 457
 458 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 459 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 460                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 461                    -Werror=implicit-function-declaration -Werror=implicit-int \
 462                    -Wno-format-security \
 463                    -std=gnu89
 464 KBUILD_CPPFLAGS := -D__KERNEL__
 465 KBUILD_AFLAGS_KERNEL :=
 466 KBUILD_CFLAGS_KERNEL :=
 467 KBUILD_AFLAGS_MODULE  := -DMODULE
 468 KBUILD_CFLAGS_MODULE  := -DMODULE
 469 KBUILD_LDFLAGS_MODULE :=
 470 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
 471 KBUILD_LDFLAGS :=
 472 GCC_PLUGINS_CFLAGS :=
 473 CLANG_FLAGS :=
 474
 475 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 476 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
 477 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 478 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 479
 480 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 481 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 482 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 483 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 484 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 485 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 486
 487 # Files to ignore in find ... statements
 488
 489 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 490                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 491                           -prune -o
 492 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 493                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 494
 495 # ===========================================================================
 496 # Rules shared between *config targets and build targets
 497
 498 # Basic helpers built in scripts/basic/
 499 PHONY += scripts_basic
 500 scripts_basic:
 501         $(Q)$(MAKE) $(build)=scripts/basic
 502         $(Q)rm -f .tmp_quiet_recordmcount
 503
 504 PHONY += outputmakefile
 505 # Before starting out-of-tree build, make sure the source tree is clean.
 506 # outputmakefile generates a Makefile in the output directory, if using a
 507 # separate output directory. This allows convenient use of make in the
 508 # output directory.
 509 # At the same time when output Makefile generated, generate .gitignore to
 510 # ignore whole output directory
 511 outputmakefile:
 512 ifdef building_out_of_srctree
 513         $(Q)if [ -f $(srctree)/.config -o \
 514                  -d $(srctree)/include/config -o \
 515                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 516                 echo >&2 "***"; \
 517                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 518                 echo >&2 "*** in $(abs_srctree)";\
 519                 echo >&2 "***"; \
 520                 false; \
 521         fi
 522         $(Q)ln -fsn $(srctree) source
 523         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 524         $(Q)test -e .gitignore || \
 525         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 526 endif
 527
 528 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 529 ifneq ($(CROSS_COMPILE),)
 530 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 531 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 532 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 533 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 534 endif
 535 ifneq ($(GCC_TOOLCHAIN),)
 536 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 537 endif
 538 ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
 539 CLANG_FLAGS     += -no-integrated-as
 540 endif
 541 CLANG_FLAGS     += -Werror=unknown-warning-option
 542 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 543 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 544 export CLANG_FLAGS
 545 endif
 546
 547 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 548 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 549 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 550 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 551 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 552
 553 ifdef config-build
 554 # ===========================================================================
 555 # *config targets only - make sure prerequisites are updated, and descend
 556 # in scripts/kconfig to make the *config target
 557
 558 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 559 # KBUILD_DEFCONFIG may point out an alternative default configuration
 560 # used for 'make defconfig'
 561 include arch/$(SRCARCH)/Makefile
 562 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 563
 564 config: outputmakefile scripts_basic FORCE
 565         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 566
 567 %config: outputmakefile scripts_basic FORCE
 568         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 569
 570 else #!config-build
 571 # ===========================================================================
 572 # Build targets only - this includes vmlinux, arch specific targets, clean
 573 # targets and others. In general all targets except *config targets.
 574
 575 # If building an external module we do not care about the all: rule
 576 # but instead _all depend on modules
 577 PHONY += all
 578 ifeq ($(KBUILD_EXTMOD),)
 579 _all: all
 580 else
 581 _all: modules
 582 endif
 583
 584 # Decide whether to build built-in, modular, or both.
 585 # Normally, just do built-in.
 586
 587 KBUILD_MODULES :=
 588 KBUILD_BUILTIN := 1
 589
 590 # If we have only "make modules", don't compile built-in objects.
 591 # When we're building modules with modversions, we need to consider
 592 # the built-in objects during the descend as well, in order to
 593 # make sure the checksums are up to date before we record them.
 594
 595 ifeq ($(MAKECMDGOALS),modules)
 596   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 597 endif
 598
 599 # If we have "make <whatever> modules", compile modules
 600 # in addition to whatever we do anyway.
 601 # Just "make" or "make all" shall build modules as well
 602
 603 ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
 604   KBUILD_MODULES := 1
 605 endif
 606
 607 ifeq ($(MAKECMDGOALS),)
 608   KBUILD_MODULES := 1
 609 endif
 610
 611 export KBUILD_MODULES KBUILD_BUILTIN
 612
 613 ifdef need-config
 614 include include/config/auto.conf
 615 endif
 616
 617 ifeq ($(KBUILD_EXTMOD),)
 618 # Objects we will link into vmlinux / subdirs we need to visit
 619 init-y          := init/
 620 drivers-y       := drivers/ sound/
 621 drivers-$(CONFIG_SAMPLES) += samples/
 622 net-y           := net/
 623 libs-y          := lib/
 624 core-y          := usr/
 625 virt-y          := virt/
 626 endif # KBUILD_EXTMOD
 627
 628 # The all: target is the default when no target is given on the
 629 # command line.
 630 # This allow a user to issue only 'make' to build a kernel including modules
 631 # Defaults to vmlinux, but the arch makefile usually adds further targets
 632 all: vmlinux
 633
 634 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 635         $(call cc-option,-fno-tree-loop-im) \
 636         $(call cc-disable-warning,maybe-uninitialized,)
 637 export CFLAGS_GCOV
 638
 639 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 640 ifdef CONFIG_FUNCTION_TRACER
 641   CC_FLAGS_FTRACE := -pg
 642 endif
 643
 644 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 645 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 646 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 647 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 648 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 649 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 650 export RETPOLINE_CFLAGS
 651 export RETPOLINE_VDSO_CFLAGS
 652
 653 include arch/$(SRCARCH)/Makefile
 654
 655 ifdef need-config
 656 ifdef may-sync-config
 657 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 658 # changes are detected. This should be included after arch/$(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: $(KCONFIG_CONFIG)
 678         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 679 else # !may-sync-config
 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 # need-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_PERFORMANCE
 704 KBUILD_CFLAGS += -O2
 705 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 706 KBUILD_CFLAGS += -O3
 707 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 708 KBUILD_CFLAGS += -Os
 709 endif
 710
 711 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
 712 KBUILD_CFLAGS   += -Wno-maybe-uninitialized
 713 endif
 714
 715 # Tell gcc to never replace conditional load with a non-conditional one
 716 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 717
 718 include scripts/Makefile.kcov
 719 include scripts/Makefile.gcc-plugins
 720
 721 ifdef CONFIG_READABLE_ASM
 722 # Disable optimizations that make assembler listings hard to read.
 723 # reorder blocks reorders the control in the function
 724 # ipa clone creates specialized cloned functions
 725 # partial inlining inlines only parts of functions
 726 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 727                  $(call cc-option,-fno-ipa-cp-clone,) \
 728                  $(call cc-option,-fno-partial-inlining)
 729 endif
 730
 731 ifneq ($(CONFIG_FRAME_WARN),0)
 732 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 733 endif
 734
 735 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 736 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 737 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 738
 739 KBUILD_CFLAGS += $(stackp-flags-y)
 740
 741 ifdef CONFIG_CC_IS_CLANG
 742 KBUILD_CPPFLAGS += -Qunused-arguments
 743 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 744 KBUILD_CFLAGS += -Wno-gnu
 745 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 746 KBUILD_CFLAGS += -Wno-tautological-compare
 747 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 748 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 749 # See modpost pattern 2
 750 KBUILD_CFLAGS += -mno-global-merge
 751 else
 752
 753 # These warnings generated too much noise in a regular build.
 754 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 755 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 756
 757 # Warn about unmarked fall-throughs in switch statement.
 758 # Disabled for clang while comment to attribute conversion happens and
 759 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 760 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 761 endif
 762
 763 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 764 ifdef CONFIG_FRAME_POINTER
 765 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 766 else
 767 # Some targets (ARM with Thumb2, for example), can't be built with frame
 768 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 769 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 770 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 771 # -fomit-frame-pointer with FUNCTION_TRACER.
 772 ifndef CONFIG_FUNCTION_TRACER
 773 KBUILD_CFLAGS   += -fomit-frame-pointer
 774 endif
 775 endif
 776
 777 # Initialize all stack variables with a pattern, if desired.
 778 ifdef CONFIG_INIT_STACK_ALL
 779 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 780 endif
 781
 782 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 783
 784 ifdef CONFIG_DEBUG_INFO
 785 ifdef CONFIG_DEBUG_INFO_SPLIT
 786 DEBUG_CFLAGS    += -gsplit-dwarf
 787 else
 788 DEBUG_CFLAGS    += -g
 789 endif
 790 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 791 endif
 792 ifdef CONFIG_DEBUG_INFO_DWARF4
 793 DEBUG_CFLAGS    += -gdwarf-4
 794 endif
 795
 796 ifdef CONFIG_DEBUG_INFO_REDUCED
 797 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 798                    $(call cc-option,-fno-var-tracking)
 799 endif
 800
 801 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 802 export DEBUG_CFLAGS
 803
 804 ifdef CONFIG_FUNCTION_TRACER
 805 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 806   # gcc 5 supports generating the mcount tables directly
 807   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 808     CC_FLAGS_FTRACE     += -mrecord-mcount
 809     export CC_USING_RECORD_MCOUNT := 1
 810   endif
 811   ifdef CONFIG_HAVE_NOP_MCOUNT
 812     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 813       CC_FLAGS_FTRACE   += -mnop-mcount
 814       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 815     endif
 816   endif
 817 endif
 818 ifdef CONFIG_HAVE_FENTRY
 819   ifeq ($(call cc-option-yn, -mfentry),y)
 820     CC_FLAGS_FTRACE     += -mfentry
 821     CC_FLAGS_USING      += -DCC_USING_FENTRY
 822   endif
 823 endif
 824 export CC_FLAGS_FTRACE
 825 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 826 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 827 ifdef CONFIG_DYNAMIC_FTRACE
 828         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 829                 BUILD_C_RECORDMCOUNT := y
 830                 export BUILD_C_RECORDMCOUNT
 831         endif
 832 endif
 833 endif
 834
 835 # We trigger additional mismatches with less inlining
 836 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 837 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 838 endif
 839
 840 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 841 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 842 LDFLAGS_vmlinux += --gc-sections
 843 endif
 844
 845 ifdef CONFIG_LIVEPATCH
 846 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 847 endif
 848
 849 # arch Makefile may override CC so keep this after arch Makefile is included
 850 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 851
 852 # warn about C99 declaration after statement
 853 KBUILD_CFLAGS += -Wdeclaration-after-statement
 854
 855 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 856 KBUILD_CFLAGS += -Wvla
 857
 858 # disable pointer signed / unsigned warnings in gcc 4.0
 859 KBUILD_CFLAGS += -Wno-pointer-sign
 860
 861 # disable stringop warnings in gcc 8+
 862 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 863
 864 # disable invalid "can't wrap" optimizations for signed / pointers
 865 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 866
 867 # clang sets -fmerge-all-constants by default as optimization, but this
 868 # is non-conforming behavior for C and in fact breaks the kernel, so we
 869 # need to disable it here generally.
 870 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 871
 872 # for gcc -fno-merge-all-constants disables everything, but it is fine
 873 # to have actual conforming behavior enabled.
 874 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 875
 876 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 877 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 878
 879 # conserve stack if available
 880 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 881
 882 # Prohibit date/time macros, which would make the build non-deterministic
 883 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 884
 885 # enforce correct pointer usage
 886 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 887
 888 # Require designated initializers for all marked structures
 889 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 890
 891 # change __FILE__ to the relative path from the srctree
 892 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 893
 894 # ensure -fcf-protection is disabled when using retpoline as it is
 895 # incompatible with -mindirect-branch=thunk-extern
 896 ifdef CONFIG_RETPOLINE
 897 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 898 endif
 899
 900 include scripts/Makefile.kasan
 901 include scripts/Makefile.extrawarn
 902 include scripts/Makefile.ubsan
 903
 904 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 905 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 906 KBUILD_AFLAGS   += $(KAFLAGS)
 907 KBUILD_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 # make the checker run with the right architecture
 921 CHECKFLAGS += --arch=$(ARCH)
 922
 923 # insure the checker run with the right endianness
 924 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 925
 926 # the checker needs the correct machine size
 927 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 928
 929 # Default kernel image to build when no specific target is given.
 930 # KBUILD_IMAGE may be overruled on the command line or
 931 # set in the environment
 932 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 933 # this default value
 934 export KBUILD_IMAGE ?= vmlinux
 935
 936 #
 937 # INSTALL_PATH specifies where to place the updated kernel and system map
 938 # images. Default is /boot, but you can set it to other values
 939 export  INSTALL_PATH ?= /boot
 940
 941 #
 942 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 943 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 944 # an argument if needed. Otherwise it defaults to the kernel install path
 945 #
 946 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 947
 948 #
 949 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 950 # relocations required by build roots.  This is not defined in the
 951 # makefile but the argument can be passed to make if needed.
 952 #
 953
 954 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 955 export MODLIB
 956
 957 #
 958 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 959 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 960 # the default option --strip-debug will be used.  Otherwise,
 961 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 962
 963 ifdef INSTALL_MOD_STRIP
 964 ifeq ($(INSTALL_MOD_STRIP),1)
 965 mod_strip_cmd = $(STRIP) --strip-debug
 966 else
 967 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 968 endif # INSTALL_MOD_STRIP=1
 969 else
 970 mod_strip_cmd = true
 971 endif # INSTALL_MOD_STRIP
 972 export mod_strip_cmd
 973
 974 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 975 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 976 # or CONFIG_MODULE_COMPRESS_XZ.
 977
 978 mod_compress_cmd = true
 979 ifdef CONFIG_MODULE_COMPRESS
 980   ifdef CONFIG_MODULE_COMPRESS_GZIP
 981     mod_compress_cmd = gzip -n -f
 982   endif # CONFIG_MODULE_COMPRESS_GZIP
 983   ifdef CONFIG_MODULE_COMPRESS_XZ
 984     mod_compress_cmd = xz -f
 985   endif # CONFIG_MODULE_COMPRESS_XZ
 986 endif # CONFIG_MODULE_COMPRESS
 987 export mod_compress_cmd
 988
 989 ifdef CONFIG_MODULE_SIG_ALL
 990 $(eval $(call config_filename,MODULE_SIG_KEY))
 991
 992 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 993 else
 994 mod_sign_cmd = true
 995 endif
 996 export mod_sign_cmd
 997
 998 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 999
1000 ifdef CONFIG_STACK_VALIDATION
1001   has_libelf := $(call try-run,\
1002                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1003   ifeq ($(has_libelf),1)
1004     objtool_target := tools/objtool FORCE
1005   else
1006     SKIP_STACK_VALIDATION := 1
1007     export SKIP_STACK_VALIDATION
1008   endif
1009 endif
1010
1011 PHONY += prepare0
1012
1013 export MODORDER := $(extmod-prefix)modules.order
1014 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1015
1016 ifeq ($(KBUILD_EXTMOD),)
1017 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1018
1019 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1020                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1021                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1022
1023 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1024                      $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1025                         $(drivers-) $(net-) $(libs-) $(virt-))))
1026
1027 build-dirs      := $(vmlinux-dirs)
1028 clean-dirs      := $(vmlinux-alldirs)
1029
1030 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1031 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1032 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1033 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1034 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1035 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1036 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1037
1038 # Externally visible symbols (used by link-vmlinux.sh)
1039 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1040                               $(drivers-y) $(net-y) $(virt-y)
1041 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1042 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1043 export LDFLAGS_vmlinux
1044 # used by scripts/Makefile.package
1045 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1046
1047 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1048
1049 # Recurse until adjust_autoksyms.sh is satisfied
1050 PHONY += autoksyms_recursive
1051 ifdef CONFIG_TRIM_UNUSED_KSYMS
1052 autoksyms_recursive: descend modules.order
1053         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1054           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1055 endif
1056
1057 # For the kernel to actually contain only the needed exported symbols,
1058 # we have to build modules as well to determine what those symbols are.
1059 # (this can be evaluated only once include/config/auto.conf has been included)
1060 ifdef CONFIG_TRIM_UNUSED_KSYMS
1061   KBUILD_MODULES := 1
1062 endif
1063
1064 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1065
1066 $(autoksyms_h):
1067         $(Q)mkdir -p $(dir $@)
1068         $(Q)touch $@
1069
1070 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1071
1072 # Final link of vmlinux with optional arch pass after final link
1073 cmd_link-vmlinux =                                                 \
1074         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1075         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1076
1077 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1078         +$(call if_changed,link-vmlinux)
1079
1080 targets := vmlinux
1081
1082 # The actual objects are generated when descending,
1083 # make sure no implicit rule kicks in
1084 $(sort $(vmlinux-deps)): descend ;
1085
1086 filechk_kernel.release = \
1087         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1088
1089 # Store (new) KERNELRELEASE string in include/config/kernel.release
1090 include/config/kernel.release: FORCE
1091         $(call filechk,kernel.release)
1092
1093 # Additional helpers built in scripts/
1094 # Carefully list dependencies so we do not try to build scripts twice
1095 # in parallel
1096 PHONY += scripts
1097 scripts: scripts_basic scripts_dtc
1098         $(Q)$(MAKE) $(build)=$(@)
1099
1100 # Things we need to do before we recursively start building the kernel
1101 # or the modules are listed in "prepare".
1102 # A multi level approach is used. prepareN is processed before prepareN-1.
1103 # archprepare is used in arch Makefiles and when processed asm symlink,
1104 # version.h and scripts_basic is processed / created.
1105
1106 PHONY += prepare archprepare
1107
1108 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1109         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1110
1111 prepare0: archprepare
1112         $(Q)$(MAKE) $(build)=scripts/mod
1113         $(Q)$(MAKE) $(build)=.
1114
1115 # All the preparing..
1116 prepare: prepare0 prepare-objtool
1117
1118 # Support for using generic headers in asm-generic
1119 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1120
1121 PHONY += asm-generic uapi-asm-generic
1122 asm-generic: uapi-asm-generic
1123         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1124         generic=include/asm-generic
1125 uapi-asm-generic:
1126         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1127         generic=include/uapi/asm-generic
1128
1129 PHONY += prepare-objtool
1130 prepare-objtool: $(objtool_target)
1131 ifeq ($(SKIP_STACK_VALIDATION),1)
1132 ifdef CONFIG_UNWINDER_ORC
1133         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1134         @false
1135 else
1136         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1137 endif
1138 endif
1139
1140 # Generate some files
1141 # ---------------------------------------------------------------------------
1142
1143 # KERNELRELEASE can change from a few different places, meaning version.h
1144 # needs to be updated, so this check is forced on all builds
1145
1146 uts_len := 64
1147 define filechk_utsrelease.h
1148         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1149           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1150           exit 1;                                                         \
1151         fi;                                                               \
1152         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1153 endef
1154
1155 define filechk_version.h
1156         echo \#define LINUX_VERSION_CODE $(shell                         \
1157         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1158         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1159 endef
1160
1161 $(version_h): FORCE
1162         $(call filechk,version.h)
1163         $(Q)rm -f $(old_version_h)
1164
1165 include/generated/utsrelease.h: include/config/kernel.release FORCE
1166         $(call filechk,utsrelease.h)
1167
1168 PHONY += headerdep
1169 headerdep:
1170         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1171         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1172
1173 # ---------------------------------------------------------------------------
1174 # Kernel headers
1175
1176 #Default location for installed headers
1177 export INSTALL_HDR_PATH = $(objtree)/usr
1178
1179 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1180       cmd_headers_install = \
1181         mkdir -p $(INSTALL_HDR_PATH); \
1182         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1183         usr/include $(INSTALL_HDR_PATH)
1184
1185 PHONY += headers_install
1186 headers_install: headers
1187         $(call cmd,headers_install)
1188
1189 PHONY += archheaders archscripts
1190
1191 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1192
1193 PHONY += headers
1194 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1195         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1196           $(error Headers not exportable for the $(SRCARCH) architecture))
1197         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1198         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1199
1200 # Deprecated. It is no-op now.
1201 PHONY += headers_check
1202 headers_check:
1203         @:
1204
1205 ifdef CONFIG_HEADERS_INSTALL
1206 prepare: headers
1207 endif
1208
1209 PHONY += scripts_unifdef
1210 scripts_unifdef: scripts_basic
1211         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1212
1213 # ---------------------------------------------------------------------------
1214 # Kernel selftest
1215
1216 PHONY += kselftest
1217 kselftest:
1218         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1219
1220 kselftest-%: FORCE
1221         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1222
1223 PHONY += kselftest-merge
1224 kselftest-merge:
1225         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1226         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1227                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1228         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1229
1230 # ---------------------------------------------------------------------------
1231 # Devicetree files
1232
1233 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1234 dtstree := arch/$(SRCARCH)/boot/dts
1235 endif
1236
1237 ifneq ($(dtstree),)
1238
1239 %.dtb: include/config/kernel.release scripts_dtc
1240         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1241
1242 PHONY += dtbs dtbs_install dtbs_check
1243 dtbs dtbs_check: include/config/kernel.release scripts_dtc
1244         $(Q)$(MAKE) $(build)=$(dtstree)
1245
1246 dtbs_check: export CHECK_DTBS=1
1247 dtbs_check: dt_binding_check
1248
1249 dtbs_install:
1250         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1251
1252 ifdef CONFIG_OF_EARLY_FLATTREE
1253 all: dtbs
1254 endif
1255
1256 endif
1257
1258 PHONY += scripts_dtc
1259 scripts_dtc: scripts_basic
1260         $(Q)$(MAKE) $(build)=scripts/dtc
1261
1262 PHONY += dt_binding_check
1263 dt_binding_check: scripts_dtc
1264         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1265
1266 # ---------------------------------------------------------------------------
1267 # Modules
1268
1269 ifdef CONFIG_MODULES
1270
1271 # By default, build modules as well
1272
1273 all: modules
1274
1275 # Build modules
1276 #
1277 # A module can be listed more than once in obj-m resulting in
1278 # duplicate lines in modules.order files.  Those are removed
1279 # using awk while concatenating to the final file.
1280
1281 PHONY += modules
1282 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order
1283         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1284         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1285
1286 modules.order: descend
1287         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1288
1289 # Target to prepare building external modules
1290 PHONY += modules_prepare
1291 modules_prepare: prepare
1292
1293 # Target to install modules
1294 PHONY += modules_install
1295 modules_install: _modinst_ _modinst_post
1296
1297 PHONY += _modinst_
1298 _modinst_:
1299         @rm -rf $(MODLIB)/kernel
1300         @rm -f $(MODLIB)/source
1301         @mkdir -p $(MODLIB)/kernel
1302         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1303         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1304                 rm -f $(MODLIB)/build ; \
1305                 ln -s $(CURDIR) $(MODLIB)/build ; \
1306         fi
1307         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1308         @cp -f modules.builtin $(MODLIB)/
1309         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1310         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1311
1312 # This depmod is only for convenience to give the initial
1313 # boot a modules.dep even before / is mounted read-write.  However the
1314 # boot script depmod is the master version.
1315 PHONY += _modinst_post
1316 _modinst_post: _modinst_
1317         $(call cmd,depmod)
1318
1319 ifeq ($(CONFIG_MODULE_SIG), y)
1320 PHONY += modules_sign
1321 modules_sign:
1322         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1323 endif
1324
1325 else # CONFIG_MODULES
1326
1327 # Modules not configured
1328 # ---------------------------------------------------------------------------
1329
1330 PHONY += modules modules_install
1331 modules modules_install:
1332         @echo >&2
1333         @echo >&2 "The present kernel configuration has modules disabled."
1334         @echo >&2 "Type 'make config' and enable loadable module support."
1335         @echo >&2 "Then build a kernel with module support enabled."
1336         @echo >&2
1337         @exit 1
1338
1339 endif # CONFIG_MODULES
1340
1341 ###
1342 # Cleaning is done on three levels.
1343 # make clean     Delete most generated files
1344 #                Leave enough to build external modules
1345 # make mrproper  Delete the current configuration, and all generated files
1346 # make distclean Remove editor backup files, patch leftover files and the like
1347
1348 # Directories & files removed with 'make clean'
1349 CLEAN_DIRS  += include/ksym
1350 CLEAN_FILES += modules.builtin modules.builtin.modinfo modules.nsdeps
1351
1352 # Directories & files removed with 'make mrproper'
1353 MRPROPER_DIRS  += include/config include/generated          \
1354                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1355                   debian/ snap/ tar-install/
1356 MRPROPER_FILES += .config .config.old .version \
1357                   Module.symvers \
1358                   signing_key.pem signing_key.priv signing_key.x509     \
1359                   x509.genkey extra_certificates signing_key.x509.keyid \
1360                   signing_key.x509.signer vmlinux-gdb.py \
1361                   *.spec
1362
1363 # Directories & files removed with 'make distclean'
1364 DISTCLEAN_DIRS  +=
1365 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1366
1367 # clean - Delete most, but leave enough to build external modules
1368 #
1369 clean: rm-dirs  := $(CLEAN_DIRS)
1370 clean: rm-files := $(CLEAN_FILES)
1371
1372 PHONY += archclean vmlinuxclean
1373
1374 vmlinuxclean:
1375         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1376         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1377
1378 clean: archclean vmlinuxclean
1379
1380 # mrproper - Delete all generated files, including .config
1381 #
1382 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1383 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1384 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1385
1386 PHONY += $(mrproper-dirs) mrproper
1387 $(mrproper-dirs):
1388         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1389
1390 mrproper: clean $(mrproper-dirs)
1391         $(call cmd,rmdirs)
1392         $(call cmd,rmfiles)
1393
1394 # distclean
1395 #
1396 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1397 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1398
1399 PHONY += distclean
1400
1401 distclean: mrproper
1402         $(call cmd,rmdirs)
1403         $(call cmd,rmfiles)
1404         @find $(srctree) $(RCS_FIND_IGNORE) \
1405                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1406                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1407                 -o -name 'core' \) \
1408                 -type f -print | xargs rm -f
1409
1410
1411 # Packaging of the kernel to various formats
1412 # ---------------------------------------------------------------------------
1413
1414 %src-pkg: FORCE
1415         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1416 %pkg: include/config/kernel.release FORCE
1417         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1418
1419 # Brief documentation of the typical targets used
1420 # ---------------------------------------------------------------------------
1421
1422 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1423 boards := $(sort $(notdir $(boards)))
1424 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1425 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1426
1427 PHONY += help
1428 help:
1429         @echo  'Cleaning targets:'
1430         @echo  '  clean           - Remove most generated files but keep the config and'
1431         @echo  '                    enough build support to build external modules'
1432         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1433         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1434         @echo  ''
1435         @echo  'Configuration targets:'
1436         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1437         @echo  ''
1438         @echo  'Other generic targets:'
1439         @echo  '  all             - Build all targets marked with [*]'
1440         @echo  '* vmlinux         - Build the bare kernel'
1441         @echo  '* modules         - Build all modules'
1442         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1443         @echo  '  dir/            - Build all files in dir and below'
1444         @echo  '  dir/file.[ois]  - Build specified target only'
1445         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1446         @echo  '                    (requires compiler support for LLVM assembly generation)'
1447         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1448         @echo  '                    (requires a recent binutils and recent build (System.map))'
1449         @echo  '  dir/file.ko     - Build module including final link'
1450         @echo  '  modules_prepare - Set up for building external modules'
1451         @echo  '  tags/TAGS       - Generate tags file for editors'
1452         @echo  '  cscope          - Generate cscope index'
1453         @echo  '  gtags           - Generate GNU GLOBAL index'
1454         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1455         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1456         @echo  '  image_name      - Output the image name (use with make -s)'
1457         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1458          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1459          echo  ''
1460         @echo  'Static analysers:'
1461         @echo  '  checkstack      - Generate a list of stack hogs'
1462         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1463         @echo  '  versioncheck    - Sanity check on version.h usage'
1464         @echo  '  includecheck    - Check for duplicate included header files'
1465         @echo  '  export_report   - List the usages of all exported symbols'
1466         @echo  '  headerdep       - Detect inclusion cycles in headers'
1467         @echo  '  coccicheck      - Check with Coccinelle'
1468         @echo  ''
1469         @echo  'Tools:'
1470         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1471         @echo  ''
1472         @echo  'Kernel selftest:'
1473         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1474         @echo  '                    Build, install, and boot kernel before'
1475         @echo  '                    running kselftest on it'
1476         @echo  '  kselftest-clean - Remove all generated kselftest files'
1477         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1478         @echo  '                    .config.'
1479         @echo  ''
1480         @$(if $(dtstree), \
1481                 echo 'Devicetree:'; \
1482                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1483                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1484                 echo '  dt_binding_check - Validate device tree binding documents'; \
1485                 echo '  dtbs_check       - Validate device tree source files';\
1486                 echo '')
1487
1488         @echo 'Userspace tools targets:'
1489         @echo '  use "make tools/help"'
1490         @echo '  or  "cd tools; make help"'
1491         @echo  ''
1492         @echo  'Kernel packaging:'
1493         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1494         @echo  ''
1495         @echo  'Documentation targets:'
1496         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1497         @echo  ''
1498         @echo  'Architecture specific targets ($(SRCARCH)):'
1499         @$(if $(archhelp),$(archhelp),\
1500                 echo '  No architecture specific help defined for $(SRCARCH)')
1501         @echo  ''
1502         @$(if $(boards), \
1503                 $(foreach b, $(boards), \
1504                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1505                 echo '')
1506         @$(if $(board-dirs), \
1507                 $(foreach b, $(board-dirs), \
1508                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1509                 printf "  %-16s - Show all of the above\\n" help-boards; \
1510                 echo '')
1511
1512         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1513         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1514         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1515         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1516         @echo  '                       (sparse by default)'
1517         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1518         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1519         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1520         @echo  '                1: warnings which may be relevant and do not occur too often'
1521         @echo  '                2: warnings which occur quite often but may still be relevant'
1522         @echo  '                3: more obscure warnings, can most likely be ignored'
1523         @echo  '                Multiple levels can be combined with W=12 or W=123'
1524         @echo  ''
1525         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1526         @echo  'For further info see the ./README file'
1527
1528
1529 help-board-dirs := $(addprefix help-,$(board-dirs))
1530
1531 help-boards: $(help-board-dirs)
1532
1533 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1534
1535 $(help-board-dirs): help-%:
1536         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1537         @$(if $(boards-per-dir), \
1538                 $(foreach b, $(boards-per-dir), \
1539                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1540                 echo '')
1541
1542
1543 # Documentation targets
1544 # ---------------------------------------------------------------------------
1545 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1546                linkcheckdocs dochelp refcheckdocs
1547 PHONY += $(DOC_TARGETS)
1548 $(DOC_TARGETS):
1549         $(Q)$(MAKE) $(build)=Documentation $@
1550
1551 # Misc
1552 # ---------------------------------------------------------------------------
1553
1554 PHONY += scripts_gdb
1555 scripts_gdb: prepare0
1556         $(Q)$(MAKE) $(build)=scripts/gdb
1557         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1558
1559 ifdef CONFIG_GDB_SCRIPTS
1560 all: scripts_gdb
1561 endif
1562
1563 else # KBUILD_EXTMOD
1564
1565 ###
1566 # External module support.
1567 # When building external modules the kernel used as basis is considered
1568 # read-only, and no consistency checks are made and the make
1569 # system is not used on the basis kernel. If updates are required
1570 # in the basis kernel ordinary make commands (without M=...) must
1571 # be used.
1572 #
1573 # The following are the only valid targets when building external
1574 # modules.
1575 # make M=dir clean     Delete all automatically generated files
1576 # make M=dir modules   Make all modules in specified dir
1577 # make M=dir           Same as 'make M=dir modules'
1578 # make M=dir modules_install
1579 #                      Install the modules built in the module directory
1580 #                      Assumes install directory is already created
1581
1582 # We are always building modules
1583 KBUILD_MODULES := 1
1584
1585 PHONY += $(objtree)/Module.symvers
1586 $(objtree)/Module.symvers:
1587         @test -e $(objtree)/Module.symvers || ( \
1588         echo; \
1589         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1590         echo "           is missing; modules will have no dependencies and modversions."; \
1591         echo )
1592
1593 build-dirs := $(KBUILD_EXTMOD)
1594 PHONY += modules
1595 modules: descend $(objtree)/Module.symvers
1596         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1597
1598 PHONY += modules_install
1599 modules_install: _emodinst_ _emodinst_post
1600
1601 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1602 PHONY += _emodinst_
1603 _emodinst_:
1604         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1605         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1606
1607 PHONY += _emodinst_post
1608 _emodinst_post: _emodinst_
1609         $(call cmd,depmod)
1610
1611 clean-dirs := $(KBUILD_EXTMOD)
1612 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1613
1614 PHONY += /
1615 /:
1616         @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1617
1618 PHONY += help
1619 help:
1620         @echo  '  Building external modules.'
1621         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1622         @echo  ''
1623         @echo  '  modules         - default target, build the module(s)'
1624         @echo  '  modules_install - install the module'
1625         @echo  '  clean           - remove generated files in module directory only'
1626         @echo  ''
1627
1628 PHONY += prepare
1629 endif # KBUILD_EXTMOD
1630
1631 # Single targets
1632 # ---------------------------------------------------------------------------
1633 # To build individual files in subdirectories, you can do like this:
1634 #
1635 #   make foo/bar/baz.s
1636 #
1637 # The supported suffixes for single-target are listed in 'single-targets'
1638 #
1639 # To build only under specific subdirectories, you can do like this:
1640 #
1641 #   make foo/bar/baz/
1642
1643 ifdef single-build
1644
1645 # .ko is special because modpost is needed
1646 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1647 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1648
1649 $(single-ko): single_modpost
1650         @:
1651 $(single-no-ko): descend
1652         @:
1653
1654 ifeq ($(KBUILD_EXTMOD),)
1655 # For the single build of in-tree modules, use a temporary file to avoid
1656 # the situation of modules_install installing an invalid modules.order.
1657 MODORDER := .modules.tmp
1658 endif
1659
1660 PHONY += single_modpost
1661 single_modpost: $(single-no-ko)
1662         $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1663         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1664
1665 KBUILD_MODULES := 1
1666
1667 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1668
1669 # trim unrelated directories
1670 build-dirs := $(foreach d, $(build-dirs), \
1671                         $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1672
1673 endif
1674
1675 # Handle descending into subdirectories listed in $(build-dirs)
1676 # Preset locale variables to speed up the build process. Limit locale
1677 # tweaks to this spot to avoid wrong language settings when running
1678 # make menuconfig etc.
1679 # Error messages still appears in the original language
1680 PHONY += descend $(build-dirs)
1681 descend: $(build-dirs)
1682 $(build-dirs): prepare
1683         $(Q)$(MAKE) $(build)=$@ \
1684         single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1685         need-builtin=1 need-modorder=1
1686
1687 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1688 PHONY += $(clean-dirs) clean
1689 $(clean-dirs):
1690         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1691
1692 clean: $(clean-dirs)
1693         $(call cmd,rmdirs)
1694         $(call cmd,rmfiles)
1695         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1696                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1697                 -o -name '*.ko.*' \
1698                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1699                 -o -name '*.dwo' -o -name '*.lst' \
1700                 -o -name '*.su' -o -name '*.mod' \
1701                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1702                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1703                 -o -name '*.asn1.[ch]' \
1704                 -o -name '*.symtypes' -o -name 'modules.order' \
1705                 -o -name '.tmp_*.o.*' \
1706                 -o -name '*.c.[012]*.*' \
1707                 -o -name '*.ll' \
1708                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1709
1710 # Generate tags for editors
1711 # ---------------------------------------------------------------------------
1712 quiet_cmd_tags = GEN     $@
1713       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1714
1715 tags TAGS cscope gtags: FORCE
1716         $(call cmd,tags)
1717
1718 # Script to generate missing namespace dependencies
1719 # ---------------------------------------------------------------------------
1720
1721 PHONY += nsdeps
1722 nsdeps: export KBUILD_NSDEPS=1
1723 nsdeps: modules
1724         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1725
1726 # Scripts to check various things for consistency
1727 # ---------------------------------------------------------------------------
1728
1729 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1730
1731 includecheck:
1732         find $(srctree)/* $(RCS_FIND_IGNORE) \
1733                 -name '*.[hcS]' -type f -print | sort \
1734                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1735
1736 versioncheck:
1737         find $(srctree)/* $(RCS_FIND_IGNORE) \
1738                 -name '*.[hcS]' -type f -print | sort \
1739                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1740
1741 coccicheck:
1742         $(Q)$(BASH) $(srctree)/scripts/$@
1743
1744 namespacecheck:
1745         $(PERL) $(srctree)/scripts/namespace.pl
1746
1747 export_report:
1748         $(PERL) $(srctree)/scripts/export_report.pl
1749
1750 PHONY += checkstack kernelrelease kernelversion image_name
1751
1752 # UML needs a little special treatment here.  It wants to use the host
1753 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1754 # else wants $(ARCH), including people doing cross-builds, which means
1755 # that $(SUBARCH) doesn't work here.
1756 ifeq ($(ARCH), um)
1757 CHECKSTACK_ARCH := $(SUBARCH)
1758 else
1759 CHECKSTACK_ARCH := $(ARCH)
1760 endif
1761 checkstack:
1762         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1763         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1764
1765 kernelrelease:
1766         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1767
1768 kernelversion:
1769         @echo $(KERNELVERSION)
1770
1771 image_name:
1772         @echo $(KBUILD_IMAGE)
1773
1774 # Clear a bunch of variables before executing the submake
1775
1776 ifeq ($(quiet),silent_)
1777 tools_silent=s
1778 endif
1779
1780 tools/: FORCE
1781         $(Q)mkdir -p $(objtree)/tools
1782         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1783
1784 tools/%: FORCE
1785         $(Q)mkdir -p $(objtree)/tools
1786         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1787
1788 # FIXME Should go into a make.lib or something
1789 # ===========================================================================
1790
1791 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1792       cmd_rmdirs = rm -rf $(rm-dirs)
1793
1794 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1795       cmd_rmfiles = rm -f $(rm-files)
1796
1797 # Run depmod only if we have System.map and depmod is executable
1798 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1799       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1800                    $(KERNELRELEASE)
1801
1802 # read saved command lines for existing targets
1803 existing-targets := $(wildcard $(sort $(targets)))
1804
1805 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1806
1807 endif # config-build
1808 endif # mixed-build
1809 endif # need-sub-make
1810
1811 PHONY += FORCE
1812 FORCE:
1813
1814 # Declare the contents of the PHONY variable as phony.  We keep that
1815 # information in a variable so we can use it in if_changed and friends.
1816 .PHONY: $(PHONY)