Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 0
   4 SUBLEVEL = 21
   5 EXTRAVERSION =
   6 NAME = Shy Crocodile
   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 --%,$(MAKEFLAGS))),)
  94   quiet=silent_
  95   tools_silent=s
  96 endif
  97
  98 export quiet Q KBUILD_VERBOSE
  99
 100 # kbuild supports saving output files in a separate directory.
 101 # To locate output files in a separate directory two syntaxes are supported.
 102 # In both cases the working directory must be the root of the kernel src.
 103 # 1) O=
 104 # Use "make O=dir/to/store/output/files/"
 105 #
 106 # 2) Set KBUILD_OUTPUT
 107 # Set the environment variable KBUILD_OUTPUT to point to the directory
 108 # where the output files shall be placed.
 109 # export KBUILD_OUTPUT=dir/to/store/output/files/
 110 # make
 111 #
 112 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 113 # variable.
 114
 115 # KBUILD_SRC is not intended to be used by the regular user (for now),
 116 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 # Look for make include files relative to root of kernel src
 140 #
 141 # This does not become effective immediately because MAKEFLAGS is re-parsed
 142 # once after the Makefile is read.  It is OK since we are going to invoke
 143 # 'sub-make' below.
 144 MAKEFLAGS += --include-dir=$(CURDIR)
 145
 146 need-sub-make := 1
 147 else
 148
 149 # Do not print "Entering directory ..." at all for in-tree build.
 150 MAKEFLAGS += --no-print-directory
 151
 152 endif # ifneq ($(KBUILD_OUTPUT),)
 153
 154 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 155 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 156 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 157 need-sub-make := 1
 158 # Cancel implicit rules for this Makefile.
 159 $(lastword $(MAKEFILE_LIST)): ;
 160 endif
 161
 162 export sub_make_done := 1
 163
 164 ifeq ($(need-sub-make),1)
 165
 166 PHONY += $(MAKECMDGOALS) sub-make
 167
 168 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 169         @:
 170
 171 # Invoke a second make in the output directory, passing relevant variables
 172 sub-make:
 173         $(Q)$(MAKE) \
 174         $(if $(KBUILD_OUTPUT),-C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR)) \
 175         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 176
 177 endif # need-sub-make
 178 endif # sub_make_done
 179
 180 # We process the rest of the Makefile if this is the final invocation of make
 181 ifeq ($(need-sub-make),)
 182
 183 # Do not print "Entering directory ...",
 184 # but we want to display it when entering to the output directory
 185 # so that IDEs/editors are able to understand relative filenames.
 186 MAKEFLAGS += --no-print-directory
 187
 188 # Call a source code checker (by default, "sparse") as part of the
 189 # C compilation.
 190 #
 191 # Use 'make C=1' to enable checking of only re-compiled files.
 192 # Use 'make C=2' to enable checking of *all* source files, regardless
 193 # of whether they are re-compiled or not.
 194 #
 195 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 196 # including where to get the "sparse" utility.
 197
 198 ifeq ("$(origin C)", "command line")
 199   KBUILD_CHECKSRC = $(C)
 200 endif
 201 ifndef KBUILD_CHECKSRC
 202   KBUILD_CHECKSRC = 0
 203 endif
 204
 205 # Call message checker as part of the C compilation
 206 #
 207 # Use 'make D=1' to enable checking
 208 # Use 'make D=2' to create the message catalog
 209
 210 ifdef D
 211   ifeq ("$(origin D)", "command line")
 212     KBUILD_KMSG_CHECK = $(D)
 213   endif
 214 endif
 215 ifndef KBUILD_KMSG_CHECK
 216   KBUILD_KMSG_CHECK = 0
 217 endif
 218
 219 # Use make M=dir to specify directory of external module to build
 220 # Old syntax make ... SUBDIRS=$PWD is still supported
 221 # Setting the environment variable KBUILD_EXTMOD take precedence
 222 ifdef SUBDIRS
 223   $(warning ================= WARNING ================)
 224   $(warning 'SUBDIRS' will be removed after Linux 5.3)
 225   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 226   $(warning ==========================================)
 227   KBUILD_EXTMOD ?= $(SUBDIRS)
 228 endif
 229
 230 ifeq ("$(origin M)", "command line")
 231   KBUILD_EXTMOD := $(M)
 232 endif
 233
 234 ifeq ($(KBUILD_SRC),)
 235         # building in the source tree
 236         srctree := .
 237 else
 238         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 239                 # building in a subdirectory of the source tree
 240                 srctree := ..
 241         else
 242                 srctree := $(KBUILD_SRC)
 243         endif
 244 endif
 245
 246 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 247
 248 objtree         := .
 249 src             := $(srctree)
 250 obj             := $(objtree)
 251
 252 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 253
 254 export 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_% 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 # We need some generic definitions (do not try to remake the file).
 338 scripts/Kbuild.include: ;
 339 include scripts/Kbuild.include
 340
 341 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 342 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 343 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 344 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 345
 346 include scripts/subarch.include
 347
 348 # Cross compiling and selecting different set of gcc/bin-utils
 349 # ---------------------------------------------------------------------------
 350 #
 351 # When performing cross compilation for other architectures ARCH shall be set
 352 # to the target architecture. (See arch/* for the possibilities).
 353 # ARCH can be set during invocation of make:
 354 # make ARCH=ia64
 355 # Another way is to have ARCH set in the environment.
 356 # The default ARCH is the host where make is executed.
 357
 358 # CROSS_COMPILE specify the prefix used for all executables used
 359 # during compilation. Only gcc and related bin-utils executables
 360 # are prefixed with $(CROSS_COMPILE).
 361 # CROSS_COMPILE can be set on the command line
 362 # make CROSS_COMPILE=ia64-linux-
 363 # Alternatively CROSS_COMPILE can be set in the environment.
 364 # Default value for CROSS_COMPILE is not to prefix executables
 365 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 366 ARCH            ?= $(SUBARCH)
 367
 368 # Architecture as present in compile.h
 369 UTS_MACHINE     := $(ARCH)
 370 SRCARCH         := $(ARCH)
 371
 372 # Additional ARCH settings for x86
 373 ifeq ($(ARCH),i386)
 374         SRCARCH := x86
 375 endif
 376 ifeq ($(ARCH),x86_64)
 377         SRCARCH := x86
 378 endif
 379
 380 # Additional ARCH settings for sparc
 381 ifeq ($(ARCH),sparc32)
 382        SRCARCH := sparc
 383 endif
 384 ifeq ($(ARCH),sparc64)
 385        SRCARCH := sparc
 386 endif
 387
 388 # Additional ARCH settings for sh
 389 ifeq ($(ARCH),sh64)
 390        SRCARCH := sh
 391 endif
 392
 393 KCONFIG_CONFIG  ?= .config
 394 export KCONFIG_CONFIG
 395
 396 # SHELL used by kbuild
 397 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 398           else if [ -x /bin/bash ]; then echo /bin/bash; \
 399           else echo sh; fi ; fi)
 400
 401 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 402 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 403 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 404
 405 HOSTCC       = gcc
 406 HOSTCXX      = g++
 407 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 408                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 409                 $(HOSTCFLAGS)
 410 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 411 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 412 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 413
 414 # Make variables (CC, etc...)
 415 AS              = $(CROSS_COMPILE)as
 416 LD              = $(CROSS_COMPILE)ld
 417 CC              = $(CROSS_COMPILE)gcc
 418 CPP             = $(CC) -E
 419 AR              = $(CROSS_COMPILE)ar
 420 NM              = $(CROSS_COMPILE)nm
 421 STRIP           = $(CROSS_COMPILE)strip
 422 OBJCOPY         = $(CROSS_COMPILE)objcopy
 423 OBJDUMP         = $(CROSS_COMPILE)objdump
 424 LEX             = flex
 425 YACC            = bison
 426 AWK             = awk
 427 GENKSYMS        = scripts/genksyms/genksyms
 428 INSTALLKERNEL  := installkernel
 429 DEPMOD          = /sbin/depmod
 430 PERL            = perl
 431 PYTHON          = python
 432 PYTHON2         = python2
 433 PYTHON3         = python3
 434 CHECK           = sparse
 435
 436 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 437                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 438 KMSG_CHECK      = $(srctree)/scripts/kmsg-doc
 439 NOSTDINC_FLAGS  =
 440 CFLAGS_MODULE   =
 441 AFLAGS_MODULE   =
 442 LDFLAGS_MODULE  =
 443 CFLAGS_KERNEL   =
 444 AFLAGS_KERNEL   =
 445 LDFLAGS_vmlinux =
 446
 447 # Prefer linux-backports-modules
 448 ifneq ($(KBUILD_SRC),)
 449 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
 450 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
 451 endif
 452 endif
 453
 454 # Use USERINCLUDE when you must reference the UAPI directories only.
 455 USERINCLUDE    := \
 456                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 457                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 458                 -I$(srctree)/include/uapi \
 459                 -I$(objtree)/include/generated/uapi \
 460                 -include $(srctree)/include/linux/kconfig.h
 461
 462 # Use LINUXINCLUDE when you must reference the include/ directory.
 463 # Needed to be compatible with the O= option
 464 LINUXINCLUDE    := \
 465                 $(UBUNTUINCLUDE) \
 466                 -I$(srctree)/arch/$(SRCARCH)/include \
 467                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 468                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 469                 -I$(objtree)/include \
 470                 $(USERINCLUDE)
 471
 472 # UBUNTU: Include our third party driver stuff too
 473 LINUXINCLUDE   += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
 474
 475 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 476 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 477                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 478                    -Werror-implicit-function-declaration -Werror=implicit-int \
 479                    -Wno-format-security \
 480                    -std=gnu89
 481 KBUILD_CPPFLAGS := -D__KERNEL__
 482 KBUILD_AFLAGS_KERNEL :=
 483 KBUILD_CFLAGS_KERNEL :=
 484 KBUILD_AFLAGS_MODULE  := -DMODULE
 485 KBUILD_CFLAGS_MODULE  := -DMODULE
 486 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 487 KBUILD_LDFLAGS :=
 488 GCC_PLUGINS_CFLAGS :=
 489
 490 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 491 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 492 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 493 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 494
 495 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 496 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 497 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 498 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 499 export KBUILD_KMSG_CHECK KMSG_CHECK
 500 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 501 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 502 export KBUILD_ARFLAGS
 503
 504 # When compiling out-of-tree modules, put MODVERDIR in the module
 505 # tree rather than in the kernel tree. The kernel tree might
 506 # even be read-only.
 507 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 508
 509 # Files to ignore in find ... statements
 510
 511 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 512                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 513                           -prune -o
 514 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 515                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 516
 517 # ===========================================================================
 518 # Rules shared between *config targets and build targets
 519
 520 # Basic helpers built in scripts/basic/
 521 PHONY += scripts_basic
 522 scripts_basic:
 523         $(Q)$(MAKE) $(build)=scripts/basic
 524         $(Q)rm -f .tmp_quiet_recordmcount
 525
 526 # To avoid any implicit rule to kick in, define an empty command.
 527 scripts/basic/%: scripts_basic ;
 528
 529 PHONY += outputmakefile
 530 # outputmakefile generates a Makefile in the output directory, if using a
 531 # separate output directory. This allows convenient use of make in the
 532 # output directory.
 533 outputmakefile:
 534 ifneq ($(KBUILD_SRC),)
 535         $(Q)ln -fsn $(srctree) source
 536         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 537 endif
 538
 539 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 540 ifneq ($(CROSS_COMPILE),)
 541 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
 542 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 543 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 544 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 545 endif
 546 ifneq ($(GCC_TOOLCHAIN),)
 547 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 548 endif
 549 CLANG_FLAGS     += -no-integrated-as
 550 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 551 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 552 export CLANG_FLAGS
 553 endif
 554
 555 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 556 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 557 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 558 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 559 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 560 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 561 export RETPOLINE_CFLAGS
 562 export RETPOLINE_VDSO_CFLAGS
 563
 564 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 565 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 566 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 567 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 568 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 569
 570 ifeq ($(config-targets),1)
 571 # ===========================================================================
 572 # *config targets only - make sure prerequisites are updated, and descend
 573 # in scripts/kconfig to make the *config target
 574
 575 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 576 # KBUILD_DEFCONFIG may point out an alternative default configuration
 577 # used for 'make defconfig'
 578 include arch/$(SRCARCH)/Makefile
 579 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 580
 581 config: scripts_basic outputmakefile FORCE
 582         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 583
 584 %config: scripts_basic outputmakefile FORCE
 585         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 586
 587 else
 588 # ===========================================================================
 589 # Build targets only - this includes vmlinux, arch specific targets, clean
 590 # targets and others. In general all targets except *config targets.
 591
 592 # If building an external module we do not care about the all: rule
 593 # but instead _all depend on modules
 594 PHONY += all
 595 ifeq ($(KBUILD_EXTMOD),)
 596 _all: all
 597 else
 598 _all: modules
 599 endif
 600
 601 # Decide whether to build built-in, modular, or both.
 602 # Normally, just do built-in.
 603
 604 KBUILD_MODULES :=
 605 KBUILD_BUILTIN := 1
 606
 607 # If we have only "make modules", don't compile built-in objects.
 608 # When we're building modules with modversions, we need to consider
 609 # the built-in objects during the descend as well, in order to
 610 # make sure the checksums are up to date before we record them.
 611
 612 ifeq ($(MAKECMDGOALS),modules)
 613   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 614 endif
 615
 616 # If we have "make <whatever> modules", compile modules
 617 # in addition to whatever we do anyway.
 618 # Just "make" or "make all" shall build modules as well
 619
 620 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 621   KBUILD_MODULES := 1
 622 endif
 623
 624 ifeq ($(MAKECMDGOALS),)
 625   KBUILD_MODULES := 1
 626 endif
 627
 628 export KBUILD_MODULES KBUILD_BUILTIN
 629
 630 ifeq ($(KBUILD_EXTMOD),)
 631 # Objects we will link into vmlinux / subdirs we need to visit
 632 init-y          := init/
 633 drivers-y       := drivers/ sound/ firmware/ ubuntu/
 634 net-y           := net/
 635 libs-y          := lib/
 636 core-y          := usr/
 637 virt-y          := virt/
 638 endif # KBUILD_EXTMOD
 639
 640 ifeq ($(dot-config),1)
 641 include include/config/auto.conf
 642 endif
 643
 644 # The all: target is the default when no target is given on the
 645 # command line.
 646 # This allow a user to issue only 'make' to build a kernel including modules
 647 # Defaults to vmlinux, but the arch makefile usually adds further targets
 648 all: vmlinux
 649
 650 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 651         $(call cc-option,-fno-tree-loop-im) \
 652         $(call cc-disable-warning,maybe-uninitialized,)
 653 export CFLAGS_GCOV
 654
 655 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 656 ifdef CONFIG_FUNCTION_TRACER
 657   CC_FLAGS_FTRACE := -pg
 658 endif
 659
 660 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 661 # values of the respective KBUILD_* variables
 662 ARCH_CPPFLAGS :=
 663 ARCH_AFLAGS :=
 664 ARCH_CFLAGS :=
 665 include arch/$(SRCARCH)/Makefile
 666
 667 ifeq ($(dot-config),1)
 668 ifeq ($(may-sync-config),1)
 669 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 670 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 671 # because some architectures define CROSS_COMPILE there.
 672 include include/config/auto.conf.cmd
 673
 674 # To avoid any implicit rule to kick in, define an empty command
 675 $(KCONFIG_CONFIG): ;
 676
 677 # The actual configuration files used during the build are stored in
 678 # include/generated/ and include/config/. Update them if .config is newer than
 679 # include/config/auto.conf (which mirrors .config).
 680 #
 681 # This exploits the 'multi-target pattern rule' trick.
 682 # The syncconfig should be executed only once to make all the targets.
 683 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 684         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 685 else
 686 # External modules and some install targets need include/generated/autoconf.h
 687 # and include/config/auto.conf but do not care if they are up-to-date.
 688 # Use auto.conf to trigger the test
 689 PHONY += include/config/auto.conf
 690
 691 include/config/auto.conf:
 692         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 693         echo >&2;                                                       \
 694         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 695         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 696         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 697         echo >&2 ;                                                      \
 698         /bin/false)
 699
 700 endif # may-sync-config
 701 endif # $(dot-config)
 702
 703 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 704 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 705 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 706 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 707 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 708
 709 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 710 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 711 else
 712 ifdef CONFIG_PROFILE_ALL_BRANCHES
 713 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 714 else
 715 KBUILD_CFLAGS   += -O2
 716 endif
 717 endif
 718
 719 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 720                         $(call cc-disable-warning,maybe-uninitialized,))
 721
 722 # Tell gcc to never replace conditional load with a non-conditional one
 723 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 724
 725 include scripts/Makefile.kcov
 726 include scripts/Makefile.gcc-plugins
 727
 728 ifdef CONFIG_READABLE_ASM
 729 # Disable optimizations that make assembler listings hard to read.
 730 # reorder blocks reorders the control in the function
 731 # ipa clone creates specialized cloned functions
 732 # partial inlining inlines only parts of functions
 733 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 734                  $(call cc-option,-fno-ipa-cp-clone,) \
 735                  $(call cc-option,-fno-partial-inlining)
 736 endif
 737
 738 ifneq ($(CONFIG_FRAME_WARN),0)
 739 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 740 endif
 741
 742 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 743 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 744 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 745
 746 KBUILD_CFLAGS += $(stackp-flags-y)
 747
 748 ifdef CONFIG_CC_IS_CLANG
 749 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 750 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 751 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 752 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 753 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 754 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 755 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 756 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 757 # See modpost pattern 2
 758 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 759 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 760 else
 761
 762 # These warnings generated too much noise in a regular build.
 763 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 764 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 765 endif
 766
 767 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 768 ifdef CONFIG_FRAME_POINTER
 769 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 770 else
 771 # Some targets (ARM with Thumb2, for example), can't be built with frame
 772 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 773 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 774 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 775 # -fomit-frame-pointer with FUNCTION_TRACER.
 776 ifndef CONFIG_FUNCTION_TRACER
 777 KBUILD_CFLAGS   += -fomit-frame-pointer
 778 endif
 779 endif
 780
 781 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 782
 783 ifdef CONFIG_DEBUG_INFO
 784 ifdef CONFIG_DEBUG_INFO_SPLIT
 785 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 786 else
 787 KBUILD_CFLAGS   += -g
 788 endif
 789 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 790 endif
 791 ifdef CONFIG_DEBUG_INFO_DWARF4
 792 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 793 endif
 794
 795 ifdef CONFIG_DEBUG_INFO_REDUCED
 796 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 797                    $(call cc-option,-fno-var-tracking)
 798 endif
 799
 800 ifdef CONFIG_FUNCTION_TRACER
 801 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 802   # gcc 5 supports generating the mcount tables directly
 803   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 804     CC_FLAGS_FTRACE     += -mrecord-mcount
 805     export CC_USING_RECORD_MCOUNT := 1
 806   endif
 807   ifdef CONFIG_HAVE_NOP_MCOUNT
 808     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 809       CC_FLAGS_FTRACE   += -mnop-mcount
 810       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 811     endif
 812   endif
 813 endif
 814 ifdef CONFIG_HAVE_FENTRY
 815   ifeq ($(call cc-option-yn, -mfentry),y)
 816     CC_FLAGS_FTRACE     += -mfentry
 817     CC_FLAGS_USING      += -DCC_USING_FENTRY
 818   endif
 819 endif
 820 export CC_FLAGS_FTRACE
 821 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 822 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 823 ifdef CONFIG_DYNAMIC_FTRACE
 824         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 825                 BUILD_C_RECORDMCOUNT := y
 826                 export BUILD_C_RECORDMCOUNT
 827         endif
 828 endif
 829 endif
 830
 831 # We trigger additional mismatches with less inlining
 832 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 833 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 834 endif
 835
 836 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 837 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 838 LDFLAGS_vmlinux += --gc-sections
 839 endif
 840
 841 # arch Makefile may override CC so keep this after arch Makefile is included
 842 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 843
 844 # warn about C99 declaration after statement
 845 KBUILD_CFLAGS += -Wdeclaration-after-statement
 846
 847 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 848 KBUILD_CFLAGS += $(call cc-option,-Wvla)
 849
 850 # disable pointer signed / unsigned warnings in gcc 4.0
 851 KBUILD_CFLAGS += -Wno-pointer-sign
 852
 853 # disable stringop warnings in gcc 8+
 854 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 855
 856 # disable invalid "can't wrap" optimizations for signed / pointers
 857 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 858
 859 # clang sets -fmerge-all-constants by default as optimization, but this
 860 # is non-conforming behavior for C and in fact breaks the kernel, so we
 861 # need to disable it here generally.
 862 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 863
 864 # for gcc -fno-merge-all-constants disables everything, but it is fine
 865 # to have actual conforming behavior enabled.
 866 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 867
 868 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 869 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 870
 871 # conserve stack if available
 872 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 873
 874 # Prohibit date/time macros, which would make the build non-deterministic
 875 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 876
 877 # enforce correct pointer usage
 878 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 879
 880 # Require designated initializers for all marked structures
 881 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 882
 883 # change __FILE__ to the relative path from the srctree
 884 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 885
 886 # use the deterministic mode of AR if available
 887 KBUILD_ARFLAGS := $(call ar-option,D)
 888
 889 include scripts/Makefile.kasan
 890 include scripts/Makefile.extrawarn
 891 include scripts/Makefile.ubsan
 892
 893 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 894 # last assignments
 895 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 896 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 897 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 898
 899 # Use --build-id when available.
 900 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 901 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 902 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 903
 904 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 905 LDFLAGS_vmlinux += $(call ld-option, -X,)
 906 endif
 907
 908 # insure the checker run with the right endianness
 909 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 910
 911 # the checker needs the correct machine size
 912 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 913
 914 # Default kernel image to build when no specific target is given.
 915 # KBUILD_IMAGE may be overruled on the command line or
 916 # set in the environment
 917 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 918 # this default value
 919 export KBUILD_IMAGE ?= vmlinux
 920
 921 #
 922 # INSTALL_PATH specifies where to place the updated kernel and system map
 923 # images. Default is /boot, but you can set it to other values
 924 export  INSTALL_PATH ?= /boot
 925
 926 #
 927 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 928 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 929 # an argument if needed. Otherwise it defaults to the kernel install path
 930 #
 931 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 932
 933 #
 934 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 935 # relocations required by build roots.  This is not defined in the
 936 # makefile but the argument can be passed to make if needed.
 937 #
 938
 939 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 940 export MODLIB
 941
 942 #
 943 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 944 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 945 # the default option --strip-debug will be used.  Otherwise,
 946 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 947
 948 ifdef INSTALL_MOD_STRIP
 949 ifeq ($(INSTALL_MOD_STRIP),1)
 950 mod_strip_cmd = $(STRIP) --strip-debug
 951 else
 952 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 953 endif # INSTALL_MOD_STRIP=1
 954 else
 955 mod_strip_cmd = true
 956 endif # INSTALL_MOD_STRIP
 957 export mod_strip_cmd
 958
 959 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 960 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 961 # or CONFIG_MODULE_COMPRESS_XZ.
 962
 963 mod_compress_cmd = true
 964 ifdef CONFIG_MODULE_COMPRESS
 965   ifdef CONFIG_MODULE_COMPRESS_GZIP
 966     mod_compress_cmd = gzip -n -f
 967   endif # CONFIG_MODULE_COMPRESS_GZIP
 968   ifdef CONFIG_MODULE_COMPRESS_XZ
 969     mod_compress_cmd = xz -f
 970   endif # CONFIG_MODULE_COMPRESS_XZ
 971 endif # CONFIG_MODULE_COMPRESS
 972 export mod_compress_cmd
 973
 974 # Select initial ramdisk compression format, default is gzip(1).
 975 # This shall be used by the dracut(8) tool while creating an initramfs image.
 976 #
 977 INITRD_COMPRESS-y                  := gzip
 978 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 979 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 980 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 981 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 982 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 983 # do not export INITRD_COMPRESS, since we didn't actually
 984 # choose a sane default compression above.
 985 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 986
 987 ifdef CONFIG_MODULE_SIG_ALL
 988 $(eval $(call config_filename,MODULE_SIG_KEY))
 989
 990 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 991 else
 992 mod_sign_cmd = true
 993 endif
 994 export mod_sign_cmd
 995
 996 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 997
 998 ifdef CONFIG_STACK_VALIDATION
 999   has_libelf := $(call try-run,\
1000                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1001   ifeq ($(has_libelf),1)
1002     objtool_target := tools/objtool FORCE
1003   else
1004     SKIP_STACK_VALIDATION := 1
1005     export SKIP_STACK_VALIDATION
1006   endif
1007 endif
1008
1009 PHONY += prepare0
1010
1011 ifeq ($(KBUILD_EXTMOD),)
1012 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1013
1014 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1015                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1016                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1017
1018 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
1019                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
1020
1021 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1022 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1023 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1024 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1025 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1026 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1027 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1028
1029 # Externally visible symbols (used by link-vmlinux.sh)
1030 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1031 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1032 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1033 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1034 export LDFLAGS_vmlinux
1035 # used by scripts/package/Makefile
1036 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1037
1038 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1039
1040 # Recurse until adjust_autoksyms.sh is satisfied
1041 PHONY += autoksyms_recursive
1042 autoksyms_recursive: $(vmlinux-deps)
1043 ifdef CONFIG_TRIM_UNUSED_KSYMS
1044         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1045           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1046 endif
1047
1048 # For the kernel to actually contain only the needed exported symbols,
1049 # we have to build modules as well to determine what those symbols are.
1050 # (this can be evaluated only once include/config/auto.conf has been included)
1051 ifdef CONFIG_TRIM_UNUSED_KSYMS
1052   KBUILD_MODULES := 1
1053 endif
1054
1055 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1056
1057 $(autoksyms_h):
1058         $(Q)mkdir -p $(dir $@)
1059         $(Q)touch $@
1060
1061 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1062
1063 # Final link of vmlinux with optional arch pass after final link
1064 cmd_link-vmlinux =                                                 \
1065         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1066         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1067
1068 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1069 ifdef CONFIG_GDB_SCRIPTS
1070         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1071 endif
1072         +$(call if_changed,link-vmlinux)
1073
1074 targets := vmlinux
1075
1076 # Build samples along the rest of the kernel. This needs headers_install.
1077 ifdef CONFIG_SAMPLES
1078 vmlinux-dirs += samples
1079 samples: headers_install
1080 endif
1081
1082 # The actual objects are generated when descending,
1083 # make sure no implicit rule kicks in
1084 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1085
1086 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1087 # Preset locale variables to speed up the build process. Limit locale
1088 # tweaks to this spot to avoid wrong language settings when running
1089 # make menuconfig etc.
1090 # Error messages still appears in the original language
1091
1092 PHONY += $(vmlinux-dirs)
1093 $(vmlinux-dirs): prepare
1094         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1095
1096 filechk_kernel.release = \
1097         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1098
1099 # Store (new) KERNELRELEASE string in include/config/kernel.release
1100 include/config/kernel.release: $(srctree)/Makefile FORCE
1101         $(call filechk,kernel.release)
1102
1103 # Additional helpers built in scripts/
1104 # Carefully list dependencies so we do not try to build scripts twice
1105 # in parallel
1106 PHONY += scripts
1107 scripts: scripts_basic scripts_dtc
1108         $(Q)$(MAKE) $(build)=$(@)
1109
1110 # Things we need to do before we recursively start building the kernel
1111 # or the modules are listed in "prepare".
1112 # A multi level approach is used. prepareN is processed before prepareN-1.
1113 # archprepare is used in arch Makefiles and when processed asm symlink,
1114 # version.h and scripts_basic is processed / created.
1115
1116 PHONY += prepare archprepare prepare1 prepare2 prepare3
1117
1118 # prepare3 is used to check if we are building in a separate output directory,
1119 # and if so do:
1120 # 1) Check that make has not been executed in the kernel src $(srctree)
1121 prepare3: include/config/kernel.release
1122 ifneq ($(KBUILD_SRC),)
1123         @$(kecho) '  Using $(srctree) as source for kernel'
1124         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1125                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1126                 echo >&2 "  in the '$(srctree)' directory.";\
1127                 /bin/false; \
1128         fi;
1129 endif
1130
1131 # prepare2 creates a makefile if using a separate output directory.
1132 # From this point forward, .config has been reprocessed, so any rules
1133 # that need to depend on updated CONFIG_* values can be checked here.
1134 prepare2: prepare3 outputmakefile asm-generic
1135
1136 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1137         $(cmd_crmodverdir)
1138
1139 archprepare: archheaders archscripts prepare1 scripts
1140
1141 prepare0: archprepare
1142         $(Q)$(MAKE) $(build)=scripts/mod
1143         $(Q)$(MAKE) $(build)=.
1144
1145 # All the preparing..
1146 prepare: prepare0 prepare-objtool
1147
1148 # Support for using generic headers in asm-generic
1149 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1150
1151 PHONY += asm-generic uapi-asm-generic
1152 asm-generic: uapi-asm-generic
1153         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm
1154 uapi-asm-generic:
1155         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm
1156
1157 PHONY += prepare-objtool
1158 prepare-objtool: $(objtool_target)
1159 ifeq ($(SKIP_STACK_VALIDATION),1)
1160 ifdef CONFIG_UNWINDER_ORC
1161         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1162         @false
1163 else
1164         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1165 endif
1166 endif
1167
1168 # Generate some files
1169 # ---------------------------------------------------------------------------
1170
1171 # KERNELRELEASE can change from a few different places, meaning version.h
1172 # needs to be updated, so this check is forced on all builds
1173
1174 uts_len := 64
1175 define filechk_utsrelease.h
1176         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1177           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1178           exit 1;                                                         \
1179         fi;                                                               \
1180         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1181 endef
1182
1183 define filechk_version.h
1184         echo \#define LINUX_VERSION_CODE $(shell                         \
1185         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1186         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1187 endef
1188
1189 $(version_h): FORCE
1190         $(call filechk,version.h)
1191         $(Q)rm -f $(old_version_h)
1192
1193 include/generated/utsrelease.h: include/config/kernel.release FORCE
1194         $(call filechk,utsrelease.h)
1195
1196 PHONY += headerdep
1197 headerdep:
1198         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1199         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1200
1201 # ---------------------------------------------------------------------------
1202 # Kernel headers
1203
1204 #Default location for installed headers
1205 export INSTALL_HDR_PATH = $(objtree)/usr
1206
1207 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1208 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1209
1210 PHONY += archheaders archscripts
1211
1212 PHONY += __headers
1213 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1214         $(Q)$(MAKE) $(build)=scripts build_unifdef
1215
1216 PHONY += headers_install_all
1217 headers_install_all:
1218         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1219
1220 PHONY += headers_install
1221 headers_install: __headers
1222         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1223           $(error Headers not exportable for the $(SRCARCH) architecture))
1224         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1225         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1226         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1227
1228 PHONY += headers_check_all
1229 headers_check_all: headers_install_all
1230         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1231
1232 PHONY += headers_check
1233 headers_check: headers_install
1234         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1235         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1236         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1237
1238 ifdef CONFIG_HEADERS_CHECK
1239 all: headers_check
1240 endif
1241
1242 # ---------------------------------------------------------------------------
1243 # Kernel selftest
1244
1245 PHONY += kselftest
1246 kselftest:
1247         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1248
1249 PHONY += kselftest-clean
1250 kselftest-clean:
1251         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1252
1253 PHONY += kselftest-merge
1254 kselftest-merge:
1255         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1256         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1257                 -m $(objtree)/.config \
1258                 $(srctree)/tools/testing/selftests/*/config
1259         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1260
1261 # ---------------------------------------------------------------------------
1262 # Devicetree files
1263
1264 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1265 dtstree := arch/$(SRCARCH)/boot/dts
1266 endif
1267
1268 ifneq ($(dtstree),)
1269
1270 %.dtb: prepare3 scripts_dtc
1271         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1272
1273 PHONY += dtbs dtbs_install dt_binding_check
1274 dtbs dtbs_check: prepare3 scripts_dtc
1275         $(Q)$(MAKE) $(build)=$(dtstree)
1276
1277 dtbs_check: export CHECK_DTBS=1
1278 dtbs_check: dt_binding_check
1279
1280 dtbs_install:
1281         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1282
1283 ifdef CONFIG_OF_EARLY_FLATTREE
1284 all: dtbs
1285 endif
1286
1287 endif
1288
1289 PHONY += scripts_dtc
1290 scripts_dtc: scripts_basic
1291         $(Q)$(MAKE) $(build)=scripts/dtc
1292
1293 dt_binding_check: scripts_dtc
1294         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1295
1296 # ---------------------------------------------------------------------------
1297 # Modules
1298
1299 ifdef CONFIG_MODULES
1300
1301 # By default, build modules as well
1302
1303 all: modules
1304
1305 # Build modules
1306 #
1307 # A module can be listed more than once in obj-m resulting in
1308 # duplicate lines in modules.order files.  Those are removed
1309 # using awk while concatenating to the final file.
1310
1311 PHONY += modules
1312 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1313         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1314         @$(kecho) '  Building modules, stage 2.';
1315         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1316
1317 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1318         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1319
1320 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1321         $(Q)$(MAKE) $(modbuiltin)=$*
1322
1323
1324 # Target to prepare building external modules
1325 PHONY += modules_prepare
1326 modules_prepare: prepare
1327
1328 # Target to install modules
1329 PHONY += modules_install
1330 modules_install: _modinst_ _modinst_post
1331
1332 PHONY += _modinst_
1333 _modinst_:
1334         @rm -rf $(MODLIB)/kernel
1335         @rm -f $(MODLIB)/source
1336         @mkdir -p $(MODLIB)/kernel
1337         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1338         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1339                 rm -f $(MODLIB)/build ; \
1340                 ln -s $(CURDIR) $(MODLIB)/build ; \
1341         fi
1342         @cp -f $(objtree)/modules.order $(MODLIB)/
1343         @cp -f $(objtree)/modules.builtin $(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  += $(MODVERDIR) include/ksym
1384
1385 # Directories & files removed with 'make mrproper'
1386 MRPROPER_DIRS  += include/config usr/include include/generated          \
1387                   arch/*/include/generated .tmp_objdiff
1388 MRPROPER_FILES += .config .config.old .version \
1389                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1390                   signing_key.pem signing_key.priv signing_key.x509     \
1391                   x509.genkey extra_certificates signing_key.x509.keyid \
1392                   signing_key.x509.signer vmlinux-gdb.py
1393
1394 # clean - Delete most, but leave enough to build external modules
1395 #
1396 clean: rm-dirs  := $(CLEAN_DIRS)
1397 clean: rm-files := $(CLEAN_FILES)
1398 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1399
1400 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1401 $(clean-dirs):
1402         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1403
1404 vmlinuxclean:
1405         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1406         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1407
1408 clean: archclean vmlinuxclean
1409
1410 # mrproper - Delete all generated files, including .config
1411 #
1412 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1413 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1414 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1415
1416 PHONY += $(mrproper-dirs) mrproper
1417 $(mrproper-dirs):
1418         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1419
1420 mrproper: clean $(mrproper-dirs)
1421         $(call cmd,rmdirs)
1422         $(call cmd,rmfiles)
1423
1424 # distclean
1425 #
1426 PHONY += distclean
1427
1428 distclean: mrproper
1429         @find $(srctree) $(RCS_FIND_IGNORE) \
1430                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1431                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1432                 -o -name 'core' \) \
1433                 -type f -print | xargs rm -f
1434
1435
1436 # Packaging of the kernel to various formats
1437 # ---------------------------------------------------------------------------
1438 package-dir     := scripts/package
1439
1440 %src-pkg: FORCE
1441         $(Q)$(MAKE) $(build)=$(package-dir) $@
1442 %pkg: include/config/kernel.release FORCE
1443         $(Q)$(MAKE) $(build)=$(package-dir) $@
1444
1445
1446 # Brief documentation of the typical targets used
1447 # ---------------------------------------------------------------------------
1448
1449 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1450 boards := $(sort $(notdir $(boards)))
1451 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1452 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1453
1454 PHONY += help
1455 help:
1456         @echo  'Cleaning targets:'
1457         @echo  '  clean           - Remove most generated files but keep the config and'
1458         @echo  '                    enough build support to build external modules'
1459         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1460         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1461         @echo  ''
1462         @echo  'Configuration targets:'
1463         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1464         @echo  ''
1465         @echo  'Other generic targets:'
1466         @echo  '  all             - Build all targets marked with [*]'
1467         @echo  '* vmlinux         - Build the bare kernel'
1468         @echo  '* modules         - Build all modules'
1469         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1470         @echo  '  dir/            - Build all files in dir and below'
1471         @echo  '  dir/file.[ois]  - Build specified target only'
1472         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1473         @echo  '                    (requires compiler support for LLVM assembly generation)'
1474         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1475         @echo  '                    (requires a recent binutils and recent build (System.map))'
1476         @echo  '  dir/file.ko     - Build module including final link'
1477         @echo  '  modules_prepare - Set up for building external modules'
1478         @echo  '  tags/TAGS       - Generate tags file for editors'
1479         @echo  '  cscope          - Generate cscope index'
1480         @echo  '  gtags           - Generate GNU GLOBAL index'
1481         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1482         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1483         @echo  '  image_name      - Output the image name (use with make -s)'
1484         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1485          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1486          echo  ''
1487         @echo  'Static analysers:'
1488         @echo  '  checkstack      - Generate a list of stack hogs'
1489         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1490         @echo  '  versioncheck    - Sanity check on version.h usage'
1491         @echo  '  includecheck    - Check for duplicate included header files'
1492         @echo  '  export_report   - List the usages of all exported symbols'
1493         @echo  '  headers_check   - Sanity check on exported headers'
1494         @echo  '  headerdep       - Detect inclusion cycles in headers'
1495         @echo  '  coccicheck      - Check with Coccinelle'
1496         @echo  ''
1497         @echo  'Kernel selftest:'
1498         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1499         @echo  '                    Build, install, and boot kernel before'
1500         @echo  '                    running kselftest on it'
1501         @echo  '  kselftest-clean - Remove all generated kselftest files'
1502         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1503         @echo  '                    .config.'
1504         @echo  ''
1505         @$(if $(dtstree), \
1506                 echo 'Devicetree:'; \
1507                 echo '* dtbs            - Build device tree blobs for enabled boards'; \
1508                 echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1509                 echo '')
1510
1511         @echo 'Userspace tools targets:'
1512         @echo '  use "make tools/help"'
1513         @echo '  or  "cd tools; make help"'
1514         @echo  ''
1515         @echo  'Kernel packaging:'
1516         @$(MAKE) $(build)=$(package-dir) help
1517         @echo  ''
1518         @echo  'Documentation targets:'
1519         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1520         @echo  ''
1521         @echo  'Architecture specific targets ($(SRCARCH)):'
1522         @$(if $(archhelp),$(archhelp),\
1523                 echo '  No architecture specific help defined for $(SRCARCH)')
1524         @echo  ''
1525         @$(if $(boards), \
1526                 $(foreach b, $(boards), \
1527                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1528                 echo '')
1529         @$(if $(board-dirs), \
1530                 $(foreach b, $(board-dirs), \
1531                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1532                 printf "  %-16s - Show all of the above\\n" help-boards; \
1533                 echo '')
1534
1535         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1536         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1537         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1538         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1539         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1540         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1541         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1542         @echo  '                1: warnings which may be relevant and do not occur too often'
1543         @echo  '                2: warnings which occur quite often but may still be relevant'
1544         @echo  '                3: more obscure warnings, can most likely be ignored'
1545         @echo  '                Multiple levels can be combined with W=12 or W=123'
1546         @echo  ''
1547         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1548         @echo  'For further info see the ./README file'
1549
1550
1551 help-board-dirs := $(addprefix help-,$(board-dirs))
1552
1553 help-boards: $(help-board-dirs)
1554
1555 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1556
1557 $(help-board-dirs): help-%:
1558         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1559         @$(if $(boards-per-dir), \
1560                 $(foreach b, $(boards-per-dir), \
1561                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1562                 echo '')
1563
1564
1565 # Documentation targets
1566 # ---------------------------------------------------------------------------
1567 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1568                linkcheckdocs dochelp refcheckdocs
1569 PHONY += $(DOC_TARGETS)
1570 $(DOC_TARGETS): scripts_basic FORCE
1571         $(Q)$(MAKE) $(build)=Documentation $@
1572
1573 else # KBUILD_EXTMOD
1574
1575 ###
1576 # External module support.
1577 # When building external modules the kernel used as basis is considered
1578 # read-only, and no consistency checks are made and the make
1579 # system is not used on the basis kernel. If updates are required
1580 # in the basis kernel ordinary make commands (without M=...) must
1581 # be used.
1582 #
1583 # The following are the only valid targets when building external
1584 # modules.
1585 # make M=dir clean     Delete all automatically generated files
1586 # make M=dir modules   Make all modules in specified dir
1587 # make M=dir           Same as 'make M=dir modules'
1588 # make M=dir modules_install
1589 #                      Install the modules built in the module directory
1590 #                      Assumes install directory is already created
1591
1592 # We are always building modules
1593 KBUILD_MODULES := 1
1594
1595 PHONY += $(objtree)/Module.symvers
1596 $(objtree)/Module.symvers:
1597         @test -e $(objtree)/Module.symvers || ( \
1598         echo; \
1599         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1600         echo "           is missing; modules will have no dependencies and modversions."; \
1601         echo )
1602
1603 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1604 PHONY += $(module-dirs) modules
1605 $(module-dirs): prepare $(objtree)/Module.symvers
1606         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1607
1608 modules: $(module-dirs)
1609         @$(kecho) '  Building modules, stage 2.';
1610         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1611
1612 PHONY += modules_install
1613 modules_install: _emodinst_ _emodinst_post
1614
1615 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1616 PHONY += _emodinst_
1617 _emodinst_:
1618         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1619         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1620
1621 PHONY += _emodinst_post
1622 _emodinst_post: _emodinst_
1623         $(call cmd,depmod)
1624
1625 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1626
1627 PHONY += $(clean-dirs) clean
1628 $(clean-dirs):
1629         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1630
1631 clean:  rm-dirs := $(MODVERDIR)
1632 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1633
1634 PHONY += help
1635 help:
1636         @echo  '  Building external modules.'
1637         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1638         @echo  ''
1639         @echo  '  modules         - default target, build the module(s)'
1640         @echo  '  modules_install - install the module'
1641         @echo  '  clean           - remove generated files in module directory only'
1642         @echo  ''
1643
1644 PHONY += prepare
1645 prepare:
1646         $(cmd_crmodverdir)
1647 endif # KBUILD_EXTMOD
1648
1649 clean: $(clean-dirs)
1650         $(call cmd,rmdirs)
1651         $(call cmd,rmfiles)
1652         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1653                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1654                 -o -name '*.ko.*' \
1655                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1656                 -o -name '*.dwo' -o -name '*.lst' \
1657                 -o -name '*.su'  \
1658                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1659                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1660                 -o -name '*.asn1.[ch]' \
1661                 -o -name '*.symtypes' -o -name 'modules.order' \
1662                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1663                 -o -name '*.c.[012]*.*' \
1664                 -o -name '*.ll' \
1665                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1666
1667 # Generate tags for editors
1668 # ---------------------------------------------------------------------------
1669 quiet_cmd_tags = GEN     $@
1670       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1671
1672 tags TAGS cscope gtags: FORCE
1673         $(call cmd,tags)
1674
1675 # Scripts to check various things for consistency
1676 # ---------------------------------------------------------------------------
1677
1678 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1679
1680 includecheck:
1681         find $(srctree)/* $(RCS_FIND_IGNORE) \
1682                 -name '*.[hcS]' -type f -print | sort \
1683                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1684
1685 versioncheck:
1686         find $(srctree)/* $(RCS_FIND_IGNORE) \
1687                 -name '*.[hcS]' -type f -print | sort \
1688                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1689
1690 coccicheck:
1691         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1692
1693 namespacecheck:
1694         $(PERL) $(srctree)/scripts/namespace.pl
1695
1696 export_report:
1697         $(PERL) $(srctree)/scripts/export_report.pl
1698
1699 PHONY += checkstack kernelrelease kernelversion image_name
1700
1701 # UML needs a little special treatment here.  It wants to use the host
1702 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1703 # else wants $(ARCH), including people doing cross-builds, which means
1704 # that $(SUBARCH) doesn't work here.
1705 ifeq ($(ARCH), um)
1706 CHECKSTACK_ARCH := $(SUBARCH)
1707 else
1708 CHECKSTACK_ARCH := $(ARCH)
1709 endif
1710 checkstack:
1711         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1712         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1713
1714 kernelrelease:
1715         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1716
1717 kernelversion:
1718         @echo $(KERNELVERSION)
1719
1720 image_name:
1721         @echo $(KBUILD_IMAGE)
1722
1723 # Clear a bunch of variables before executing the submake
1724 tools/: FORCE
1725         $(Q)mkdir -p $(objtree)/tools
1726         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1727
1728 tools/%: FORCE
1729         $(Q)mkdir -p $(objtree)/tools
1730         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1731
1732 # Single targets
1733 # ---------------------------------------------------------------------------
1734 # Single targets are compatible with:
1735 # - build with mixed source and output
1736 # - build with separate output dir 'make O=...'
1737 # - external modules
1738 #
1739 #  target-dir => where to store outputfile
1740 #  build-dir  => directory in kernel source tree to use
1741
1742 ifeq ($(KBUILD_EXTMOD),)
1743         build-dir  = $(patsubst %/,%,$(dir $@))
1744         target-dir = $(dir $@)
1745 else
1746         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1747         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1748         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1749 endif
1750
1751 %.s: %.c prepare FORCE
1752         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1753 %.i: %.c prepare FORCE
1754         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1755 %.o: %.c prepare FORCE
1756         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1757 %.lst: %.c prepare FORCE
1758         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1759 %.s: %.S prepare FORCE
1760         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1761 %.o: %.S prepare FORCE
1762         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1763 %.symtypes: %.c prepare FORCE
1764         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1765 %.ll: %.c prepare FORCE
1766         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1767
1768 # Modules
1769 /: prepare FORCE
1770         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1771         $(build)=$(build-dir)
1772 # Make sure the latest headers are built for Documentation
1773 Documentation/ samples/: headers_install
1774 %/: prepare FORCE
1775         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1776         $(build)=$(build-dir)
1777 %.ko: prepare FORCE
1778         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1779         $(build)=$(build-dir) $(@:.ko=.o)
1780         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1781
1782 # FIXME Should go into a make.lib or something
1783 # ===========================================================================
1784
1785 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1786       cmd_rmdirs = rm -rf $(rm-dirs)
1787
1788 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1789       cmd_rmfiles = rm -f $(rm-files)
1790
1791 # Run depmod only if we have System.map and depmod is executable
1792 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1793       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1794                    $(KERNELRELEASE)
1795
1796 # Create temporary dir for module support files
1797 # clean it up only when building all modules
1798 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1799                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1800
1801 # read saved command lines for existing targets
1802 existing-targets := $(wildcard $(sort $(targets)))
1803
1804 cmd_files := $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1805 $(cmd_files): ; # Do not try to update included dependency files
1806 -include $(cmd_files)
1807
1808 endif   # ifeq ($(config-targets),1)
1809 endif   # ifeq ($(mixed-targets),1)
1810 endif   # need-sub-make
1811
1812 PHONY += FORCE
1813 FORCE:
1814
1815 # Declare the contents of the PHONY variable as phony.  We keep that
1816 # information in a variable so we can use it in if_changed and friends.
1817 .PHONY: $(PHONY)