Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 1
   4 SUBLEVEL = 0
   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 --%,$(MAKEFLAGS))),)
  94   quiet=silent_
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116
 117 # OK, Make called in directory where kernel src resides
 118 # Do we want to locate output files in a separate directory?
 119 ifeq ("$(origin O)", "command line")
 120   KBUILD_OUTPUT := $(O)
 121 endif
 122
 123 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 124   $(error main directory cannot contain spaces nor colons)
 125 endif
 126
 127 ifneq ($(KBUILD_OUTPUT),)
 128 # check that the output directory actually exists
 129 saved-output := $(KBUILD_OUTPUT)
 130 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 131                                                                 && pwd)
 132 $(if $(KBUILD_OUTPUT),, \
 133      $(error failed to create output directory "$(saved-output)"))
 134
 135 # Look for make include files relative to root of kernel src
 136 #
 137 # This does not become effective immediately because MAKEFLAGS is re-parsed
 138 # once after the Makefile is read.  It is OK since we are going to invoke
 139 # 'sub-make' below.
 140 MAKEFLAGS += --include-dir=$(CURDIR)
 141
 142 need-sub-make := 1
 143 else
 144
 145 # Do not print "Entering directory ..." at all for in-tree build.
 146 MAKEFLAGS += --no-print-directory
 147
 148 endif # ifneq ($(KBUILD_OUTPUT),)
 149
 150 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 151 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 152 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 153 need-sub-make := 1
 154 # Cancel implicit rules for this Makefile.
 155 $(lastword $(MAKEFILE_LIST)): ;
 156 endif
 157
 158 export sub_make_done := 1
 159
 160 ifeq ($(need-sub-make),1)
 161
 162 PHONY += $(MAKECMDGOALS) sub-make
 163
 164 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 165         @:
 166
 167 # Invoke a second make in the output directory, passing relevant variables
 168 sub-make:
 169         $(Q)$(MAKE) \
 170         $(if $(KBUILD_OUTPUT),-C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR)) \
 171         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 172
 173 endif # need-sub-make
 174 endif # sub_make_done
 175
 176 # We process the rest of the Makefile if this is the final invocation of make
 177 ifeq ($(need-sub-make),)
 178
 179 # Do not print "Entering directory ...",
 180 # but we want to display it when entering to the output directory
 181 # so that IDEs/editors are able to understand relative filenames.
 182 MAKEFLAGS += --no-print-directory
 183
 184 # Call a source code checker (by default, "sparse") as part of the
 185 # C compilation.
 186 #
 187 # Use 'make C=1' to enable checking of only re-compiled files.
 188 # Use 'make C=2' to enable checking of *all* source files, regardless
 189 # of whether they are re-compiled or not.
 190 #
 191 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 192 # including where to get the "sparse" utility.
 193
 194 ifeq ("$(origin C)", "command line")
 195   KBUILD_CHECKSRC = $(C)
 196 endif
 197 ifndef KBUILD_CHECKSRC
 198   KBUILD_CHECKSRC = 0
 199 endif
 200
 201 # Use make M=dir to specify directory of external module to build
 202 # Old syntax make ... SUBDIRS=$PWD is still supported
 203 # Setting the environment variable KBUILD_EXTMOD take precedence
 204 ifdef SUBDIRS
 205   $(warning ================= WARNING ================)
 206   $(warning 'SUBDIRS' will be removed after Linux 5.3)
 207   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 208   $(warning ==========================================)
 209   KBUILD_EXTMOD ?= $(SUBDIRS)
 210 endif
 211
 212 ifeq ("$(origin M)", "command line")
 213   KBUILD_EXTMOD := $(M)
 214 endif
 215
 216 ifeq ($(KBUILD_SRC),)
 217         # building in the source tree
 218         srctree := .
 219 else
 220         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 221                 # building in a subdirectory of the source tree
 222                 srctree := ..
 223         else
 224                 srctree := $(KBUILD_SRC)
 225         endif
 226 endif
 227
 228 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 229
 230 objtree         := .
 231 src             := $(srctree)
 232 obj             := $(objtree)
 233
 234 VPATH           := $(srctree)
 235
 236 export srctree objtree VPATH
 237
 238 # To make sure we do not include .config for any of the *config targets
 239 # catch them early, and hand them over to scripts/kconfig/Makefile
 240 # It is allowed to specify more targets when calling make, including
 241 # mixing *config targets and build targets.
 242 # For example 'make oldconfig all'.
 243 # Detect when mixed targets is specified, and make a second invocation
 244 # of make so .config is not included in this case either (for *config).
 245
 246 version_h := include/generated/uapi/linux/version.h
 247 old_version_h := include/linux/version.h
 248
 249 clean-targets := %clean mrproper cleandocs
 250 no-dot-config-targets := $(clean-targets) \
 251                          cscope gtags TAGS tags help% %docs check% coccicheck \
 252                          $(version_h) headers_% archheaders archscripts \
 253                          %asm-generic kernelversion %src-pkg
 254 no-sync-config-targets := $(no-dot-config-targets) install %install \
 255                            kernelrelease
 256
 257 config-targets  := 0
 258 mixed-targets   := 0
 259 dot-config      := 1
 260 may-sync-config := 1
 261
 262 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 263         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 264                 dot-config := 0
 265         endif
 266 endif
 267
 268 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 269         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 270                 may-sync-config := 0
 271         endif
 272 endif
 273
 274 ifneq ($(KBUILD_EXTMOD),)
 275         may-sync-config := 0
 276 endif
 277
 278 ifeq ($(KBUILD_EXTMOD),)
 279         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 280                 config-targets := 1
 281                 ifneq ($(words $(MAKECMDGOALS)),1)
 282                         mixed-targets := 1
 283                 endif
 284         endif
 285 endif
 286
 287 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 288 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 289         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 290                 mixed-targets := 1
 291         endif
 292 endif
 293
 294 # install and modules_install need also be processed one by one
 295 ifneq ($(filter install,$(MAKECMDGOALS)),)
 296         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 297                 mixed-targets := 1
 298         endif
 299 endif
 300
 301 ifeq ($(mixed-targets),1)
 302 # ===========================================================================
 303 # We're called with mixed targets (*config and build targets).
 304 # Handle them one by one.
 305
 306 PHONY += $(MAKECMDGOALS) __build_one_by_one
 307
 308 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 309         @:
 310
 311 __build_one_by_one:
 312         $(Q)set -e; \
 313         for i in $(MAKECMDGOALS); do \
 314                 $(MAKE) -f $(srctree)/Makefile $$i; \
 315         done
 316
 317 else
 318
 319 include scripts/Kbuild.include
 320
 321 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 322 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 323 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 324 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 325
 326 include scripts/subarch.include
 327
 328 # Cross compiling and selecting different set of gcc/bin-utils
 329 # ---------------------------------------------------------------------------
 330 #
 331 # When performing cross compilation for other architectures ARCH shall be set
 332 # to the target architecture. (See arch/* for the possibilities).
 333 # ARCH can be set during invocation of make:
 334 # make ARCH=ia64
 335 # Another way is to have ARCH set in the environment.
 336 # The default ARCH is the host where make is executed.
 337
 338 # CROSS_COMPILE specify the prefix used for all executables used
 339 # during compilation. Only gcc and related bin-utils executables
 340 # are prefixed with $(CROSS_COMPILE).
 341 # CROSS_COMPILE can be set on the command line
 342 # make CROSS_COMPILE=ia64-linux-
 343 # Alternatively CROSS_COMPILE can be set in the environment.
 344 # Default value for CROSS_COMPILE is not to prefix executables
 345 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 346 ARCH            ?= $(SUBARCH)
 347
 348 # Architecture as present in compile.h
 349 UTS_MACHINE     := $(ARCH)
 350 SRCARCH         := $(ARCH)
 351
 352 # Additional ARCH settings for x86
 353 ifeq ($(ARCH),i386)
 354         SRCARCH := x86
 355 endif
 356 ifeq ($(ARCH),x86_64)
 357         SRCARCH := x86
 358 endif
 359
 360 # Additional ARCH settings for sparc
 361 ifeq ($(ARCH),sparc32)
 362        SRCARCH := sparc
 363 endif
 364 ifeq ($(ARCH),sparc64)
 365        SRCARCH := sparc
 366 endif
 367
 368 # Additional ARCH settings for sh
 369 ifeq ($(ARCH),sh64)
 370        SRCARCH := sh
 371 endif
 372
 373 KCONFIG_CONFIG  ?= .config
 374 export KCONFIG_CONFIG
 375
 376 # SHELL used by kbuild
 377 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 378           else if [ -x /bin/bash ]; then echo /bin/bash; \
 379           else echo sh; fi ; fi)
 380
 381 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 382 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 383 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 384
 385 HOSTCC       = gcc
 386 HOSTCXX      = g++
 387 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 388                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 389                 $(HOSTCFLAGS)
 390 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 391 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 392 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 393
 394 # Make variables (CC, etc...)
 395 AS              = $(CROSS_COMPILE)as
 396 LD              = $(CROSS_COMPILE)ld
 397 CC              = $(CROSS_COMPILE)gcc
 398 CPP             = $(CC) -E
 399 AR              = $(CROSS_COMPILE)ar
 400 NM              = $(CROSS_COMPILE)nm
 401 STRIP           = $(CROSS_COMPILE)strip
 402 OBJCOPY         = $(CROSS_COMPILE)objcopy
 403 OBJDUMP         = $(CROSS_COMPILE)objdump
 404 LEX             = flex
 405 YACC            = bison
 406 AWK             = awk
 407 INSTALLKERNEL  := installkernel
 408 DEPMOD          = /sbin/depmod
 409 PERL            = perl
 410 PYTHON          = python
 411 PYTHON2         = python2
 412 PYTHON3         = python3
 413 CHECK           = sparse
 414
 415 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 416                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 417 NOSTDINC_FLAGS :=
 418 CFLAGS_MODULE   =
 419 AFLAGS_MODULE   =
 420 LDFLAGS_MODULE  =
 421 CFLAGS_KERNEL   =
 422 AFLAGS_KERNEL   =
 423 LDFLAGS_vmlinux =
 424
 425 # Use USERINCLUDE when you must reference the UAPI directories only.
 426 USERINCLUDE    := \
 427                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 428                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 429                 -I$(srctree)/include/uapi \
 430                 -I$(objtree)/include/generated/uapi \
 431                 -include $(srctree)/include/linux/kconfig.h
 432
 433 # Use LINUXINCLUDE when you must reference the include/ directory.
 434 # Needed to be compatible with the O= option
 435 LINUXINCLUDE    := \
 436                 -I$(srctree)/arch/$(SRCARCH)/include \
 437                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 438                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 439                 -I$(objtree)/include \
 440                 $(USERINCLUDE)
 441
 442 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 443 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 444                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 445                    -Werror=implicit-function-declaration -Werror=implicit-int \
 446                    -Wno-format-security \
 447                    -std=gnu89
 448 KBUILD_CPPFLAGS := -D__KERNEL__
 449 KBUILD_AFLAGS_KERNEL :=
 450 KBUILD_CFLAGS_KERNEL :=
 451 KBUILD_AFLAGS_MODULE  := -DMODULE
 452 KBUILD_CFLAGS_MODULE  := -DMODULE
 453 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 454 KBUILD_LDFLAGS :=
 455 GCC_PLUGINS_CFLAGS :=
 456
 457 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 458 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 459 export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 460 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 461
 462 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 463 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 464 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 465 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 466 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 467 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 468 export KBUILD_ARFLAGS
 469
 470 # When compiling out-of-tree modules, put MODVERDIR in the module
 471 # tree rather than in the kernel tree. The kernel tree might
 472 # even be read-only.
 473 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 474
 475 # Files to ignore in find ... statements
 476
 477 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 478                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 479                           -prune -o
 480 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 481                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 482
 483 # ===========================================================================
 484 # Rules shared between *config targets and build targets
 485
 486 # Basic helpers built in scripts/basic/
 487 PHONY += scripts_basic
 488 scripts_basic:
 489         $(Q)$(MAKE) $(build)=scripts/basic
 490         $(Q)rm -f .tmp_quiet_recordmcount
 491
 492 PHONY += outputmakefile
 493 # outputmakefile generates a Makefile in the output directory, if using a
 494 # separate output directory. This allows convenient use of make in the
 495 # output directory.
 496 # At the same time when output Makefile generated, generate .gitignore to
 497 # ignore whole output directory
 498 outputmakefile:
 499 ifneq ($(KBUILD_SRC),)
 500         $(Q)ln -fsn $(srctree) source
 501         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 502         $(Q)test -e .gitignore || \
 503         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 504 endif
 505
 506 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 507 ifneq ($(CROSS_COMPILE),)
 508 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
 509 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 510 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 511 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 512 endif
 513 ifneq ($(GCC_TOOLCHAIN),)
 514 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 515 endif
 516 CLANG_FLAGS     += -no-integrated-as
 517 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 518 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 519 export CLANG_FLAGS
 520 endif
 521
 522 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 523 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 524 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 525 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 526 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 527 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 528 export RETPOLINE_CFLAGS
 529 export RETPOLINE_VDSO_CFLAGS
 530
 531 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 532 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 533 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 534 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 535 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 536
 537 ifeq ($(config-targets),1)
 538 # ===========================================================================
 539 # *config targets only - make sure prerequisites are updated, and descend
 540 # in scripts/kconfig to make the *config target
 541
 542 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 543 # KBUILD_DEFCONFIG may point out an alternative default configuration
 544 # used for 'make defconfig'
 545 include arch/$(SRCARCH)/Makefile
 546 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 547
 548 config: scripts_basic outputmakefile FORCE
 549         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 550
 551 %config: scripts_basic outputmakefile FORCE
 552         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 553
 554 else
 555 # ===========================================================================
 556 # Build targets only - this includes vmlinux, arch specific targets, clean
 557 # targets and others. In general all targets except *config targets.
 558
 559 # If building an external module we do not care about the all: rule
 560 # but instead _all depend on modules
 561 PHONY += all
 562 ifeq ($(KBUILD_EXTMOD),)
 563 _all: all
 564 else
 565 _all: modules
 566 endif
 567
 568 # Decide whether to build built-in, modular, or both.
 569 # Normally, just do built-in.
 570
 571 KBUILD_MODULES :=
 572 KBUILD_BUILTIN := 1
 573
 574 # If we have only "make modules", don't compile built-in objects.
 575 # When we're building modules with modversions, we need to consider
 576 # the built-in objects during the descend as well, in order to
 577 # make sure the checksums are up to date before we record them.
 578
 579 ifeq ($(MAKECMDGOALS),modules)
 580   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 581 endif
 582
 583 # If we have "make <whatever> modules", compile modules
 584 # in addition to whatever we do anyway.
 585 # Just "make" or "make all" shall build modules as well
 586
 587 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 588   KBUILD_MODULES := 1
 589 endif
 590
 591 ifeq ($(MAKECMDGOALS),)
 592   KBUILD_MODULES := 1
 593 endif
 594
 595 export KBUILD_MODULES KBUILD_BUILTIN
 596
 597 ifeq ($(KBUILD_EXTMOD),)
 598 # Objects we will link into vmlinux / subdirs we need to visit
 599 init-y          := init/
 600 drivers-y       := drivers/ sound/
 601 net-y           := net/
 602 libs-y          := lib/
 603 core-y          := usr/
 604 virt-y          := virt/
 605 endif # KBUILD_EXTMOD
 606
 607 ifeq ($(dot-config),1)
 608 include include/config/auto.conf
 609 endif
 610
 611 # The all: target is the default when no target is given on the
 612 # command line.
 613 # This allow a user to issue only 'make' to build a kernel including modules
 614 # Defaults to vmlinux, but the arch makefile usually adds further targets
 615 all: vmlinux
 616
 617 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 618         $(call cc-option,-fno-tree-loop-im) \
 619         $(call cc-disable-warning,maybe-uninitialized,)
 620 export CFLAGS_GCOV
 621
 622 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 623 ifdef CONFIG_FUNCTION_TRACER
 624   CC_FLAGS_FTRACE := -pg
 625 endif
 626
 627 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 628 # values of the respective KBUILD_* variables
 629 ARCH_CPPFLAGS :=
 630 ARCH_AFLAGS :=
 631 ARCH_CFLAGS :=
 632 include arch/$(SRCARCH)/Makefile
 633
 634 ifeq ($(dot-config),1)
 635 ifeq ($(may-sync-config),1)
 636 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 637 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 638 # because some architectures define CROSS_COMPILE there.
 639 -include include/config/auto.conf.cmd
 640
 641 $(KCONFIG_CONFIG):
 642         @echo >&2 '***'
 643         @echo >&2 '*** Configuration file "$@" not found!'
 644         @echo >&2 '***'
 645         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 646         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 647         @echo >&2 '***'
 648         @/bin/false
 649
 650 # The actual configuration files used during the build are stored in
 651 # include/generated/ and include/config/. Update them if .config is newer than
 652 # include/config/auto.conf (which mirrors .config).
 653 #
 654 # This exploits the 'multi-target pattern rule' trick.
 655 # The syncconfig should be executed only once to make all the targets.
 656 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 657         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 658 else
 659 # External modules and some install targets need include/generated/autoconf.h
 660 # and include/config/auto.conf but do not care if they are up-to-date.
 661 # Use auto.conf to trigger the test
 662 PHONY += include/config/auto.conf
 663
 664 include/config/auto.conf:
 665         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 666         echo >&2;                                                       \
 667         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 668         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 669         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 670         echo >&2 ;                                                      \
 671         /bin/false)
 672
 673 endif # may-sync-config
 674 endif # $(dot-config)
 675
 676 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 677 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 678 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 679 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 680 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 681 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 682
 683 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 684 KBUILD_CFLAGS   += -Os
 685 else
 686 KBUILD_CFLAGS   += -O2
 687 endif
 688
 689 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
 690 KBUILD_CFLAGS   += -Wno-maybe-uninitialized
 691 endif
 692
 693 # Tell gcc to never replace conditional load with a non-conditional one
 694 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 695
 696 include scripts/Makefile.kcov
 697 include scripts/Makefile.gcc-plugins
 698
 699 ifdef CONFIG_READABLE_ASM
 700 # Disable optimizations that make assembler listings hard to read.
 701 # reorder blocks reorders the control in the function
 702 # ipa clone creates specialized cloned functions
 703 # partial inlining inlines only parts of functions
 704 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 705                  $(call cc-option,-fno-ipa-cp-clone,) \
 706                  $(call cc-option,-fno-partial-inlining)
 707 endif
 708
 709 ifneq ($(CONFIG_FRAME_WARN),0)
 710 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 711 endif
 712
 713 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 714 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 715 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 716
 717 KBUILD_CFLAGS += $(stackp-flags-y)
 718
 719 ifdef CONFIG_CC_IS_CLANG
 720 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 721 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 722 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 723 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 724 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 725 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 726 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 727 # See modpost pattern 2
 728 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 729 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 730 else
 731
 732 # These warnings generated too much noise in a regular build.
 733 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 734 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 735 endif
 736
 737 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 738 ifdef CONFIG_FRAME_POINTER
 739 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 740 else
 741 # Some targets (ARM with Thumb2, for example), can't be built with frame
 742 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 743 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 744 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 745 # -fomit-frame-pointer with FUNCTION_TRACER.
 746 ifndef CONFIG_FUNCTION_TRACER
 747 KBUILD_CFLAGS   += -fomit-frame-pointer
 748 endif
 749 endif
 750
 751 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 752
 753 ifdef CONFIG_DEBUG_INFO
 754 ifdef CONFIG_DEBUG_INFO_SPLIT
 755 DEBUG_CFLAGS    += -gsplit-dwarf
 756 else
 757 DEBUG_CFLAGS    += -g
 758 endif
 759 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 760 endif
 761 ifdef CONFIG_DEBUG_INFO_DWARF4
 762 DEBUG_CFLAGS    += -gdwarf-4
 763 endif
 764
 765 ifdef CONFIG_DEBUG_INFO_REDUCED
 766 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 767                    $(call cc-option,-fno-var-tracking)
 768 endif
 769
 770 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 771 export DEBUG_CFLAGS
 772
 773 ifdef CONFIG_FUNCTION_TRACER
 774 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 775   # gcc 5 supports generating the mcount tables directly
 776   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 777     CC_FLAGS_FTRACE     += -mrecord-mcount
 778     export CC_USING_RECORD_MCOUNT := 1
 779   endif
 780   ifdef CONFIG_HAVE_NOP_MCOUNT
 781     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 782       CC_FLAGS_FTRACE   += -mnop-mcount
 783       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 784     endif
 785   endif
 786 endif
 787 ifdef CONFIG_HAVE_FENTRY
 788   ifeq ($(call cc-option-yn, -mfentry),y)
 789     CC_FLAGS_FTRACE     += -mfentry
 790     CC_FLAGS_USING      += -DCC_USING_FENTRY
 791   endif
 792 endif
 793 export CC_FLAGS_FTRACE
 794 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 795 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 796 ifdef CONFIG_DYNAMIC_FTRACE
 797         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 798                 BUILD_C_RECORDMCOUNT := y
 799                 export BUILD_C_RECORDMCOUNT
 800         endif
 801 endif
 802 endif
 803
 804 # We trigger additional mismatches with less inlining
 805 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 806 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 807 endif
 808
 809 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 810 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 811 LDFLAGS_vmlinux += --gc-sections
 812 endif
 813
 814 # arch Makefile may override CC so keep this after arch Makefile is included
 815 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 816
 817 # warn about C99 declaration after statement
 818 KBUILD_CFLAGS += -Wdeclaration-after-statement
 819
 820 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 821 KBUILD_CFLAGS += $(call cc-option,-Wvla)
 822
 823 # disable pointer signed / unsigned warnings in gcc 4.0
 824 KBUILD_CFLAGS += -Wno-pointer-sign
 825
 826 # disable stringop warnings in gcc 8+
 827 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 828
 829 # disable invalid "can't wrap" optimizations for signed / pointers
 830 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 831
 832 # clang sets -fmerge-all-constants by default as optimization, but this
 833 # is non-conforming behavior for C and in fact breaks the kernel, so we
 834 # need to disable it here generally.
 835 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 836
 837 # for gcc -fno-merge-all-constants disables everything, but it is fine
 838 # to have actual conforming behavior enabled.
 839 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 840
 841 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 842 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 843
 844 # conserve stack if available
 845 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 846
 847 # Prohibit date/time macros, which would make the build non-deterministic
 848 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 849
 850 # enforce correct pointer usage
 851 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 852
 853 # Require designated initializers for all marked structures
 854 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 855
 856 # change __FILE__ to the relative path from the srctree
 857 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 858
 859 # use the deterministic mode of AR if available
 860 KBUILD_ARFLAGS := $(call ar-option,D)
 861
 862 include scripts/Makefile.kasan
 863 include scripts/Makefile.extrawarn
 864 include scripts/Makefile.ubsan
 865
 866 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 867 # last assignments
 868 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 869 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 870 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 871
 872 # Use --build-id when available.
 873 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 874 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 875 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 876
 877 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 878 LDFLAGS_vmlinux += $(call ld-option, -X,)
 879 endif
 880
 881 # insure the checker run with the right endianness
 882 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 883
 884 # the checker needs the correct machine size
 885 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 886
 887 # Default kernel image to build when no specific target is given.
 888 # KBUILD_IMAGE may be overruled on the command line or
 889 # set in the environment
 890 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 891 # this default value
 892 export KBUILD_IMAGE ?= vmlinux
 893
 894 #
 895 # INSTALL_PATH specifies where to place the updated kernel and system map
 896 # images. Default is /boot, but you can set it to other values
 897 export  INSTALL_PATH ?= /boot
 898
 899 #
 900 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 901 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 902 # an argument if needed. Otherwise it defaults to the kernel install path
 903 #
 904 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 905
 906 #
 907 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 908 # relocations required by build roots.  This is not defined in the
 909 # makefile but the argument can be passed to make if needed.
 910 #
 911
 912 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 913 export MODLIB
 914
 915 #
 916 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 917 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 918 # the default option --strip-debug will be used.  Otherwise,
 919 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 920
 921 ifdef INSTALL_MOD_STRIP
 922 ifeq ($(INSTALL_MOD_STRIP),1)
 923 mod_strip_cmd = $(STRIP) --strip-debug
 924 else
 925 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 926 endif # INSTALL_MOD_STRIP=1
 927 else
 928 mod_strip_cmd = true
 929 endif # INSTALL_MOD_STRIP
 930 export mod_strip_cmd
 931
 932 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 933 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 934 # or CONFIG_MODULE_COMPRESS_XZ.
 935
 936 mod_compress_cmd = true
 937 ifdef CONFIG_MODULE_COMPRESS
 938   ifdef CONFIG_MODULE_COMPRESS_GZIP
 939     mod_compress_cmd = gzip -n -f
 940   endif # CONFIG_MODULE_COMPRESS_GZIP
 941   ifdef CONFIG_MODULE_COMPRESS_XZ
 942     mod_compress_cmd = xz -f
 943   endif # CONFIG_MODULE_COMPRESS_XZ
 944 endif # CONFIG_MODULE_COMPRESS
 945 export mod_compress_cmd
 946
 947 ifdef CONFIG_MODULE_SIG_ALL
 948 $(eval $(call config_filename,MODULE_SIG_KEY))
 949
 950 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 951 else
 952 mod_sign_cmd = true
 953 endif
 954 export mod_sign_cmd
 955
 956 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 957
 958 ifdef CONFIG_STACK_VALIDATION
 959   has_libelf := $(call try-run,\
 960                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
 961   ifeq ($(has_libelf),1)
 962     objtool_target := tools/objtool FORCE
 963   else
 964     SKIP_STACK_VALIDATION := 1
 965     export SKIP_STACK_VALIDATION
 966   endif
 967 endif
 968
 969 PHONY += prepare0
 970
 971 ifeq ($(KBUILD_EXTMOD),)
 972 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 973
 974 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 975                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 976                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 977
 978 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 979                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 980
 981 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 982 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 983 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 984 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 985 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 986 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 987 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 988
 989 # Externally visible symbols (used by link-vmlinux.sh)
 990 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
 991                               $(drivers-y) $(net-y) $(virt-y)
 992 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 993 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 994 export LDFLAGS_vmlinux
 995 # used by scripts/package/Makefile
 996 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 997
 998 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
 999
1000 # Recurse until adjust_autoksyms.sh is satisfied
1001 PHONY += autoksyms_recursive
1002 autoksyms_recursive: $(vmlinux-deps)
1003 ifdef CONFIG_TRIM_UNUSED_KSYMS
1004         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1005           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1006 endif
1007
1008 # For the kernel to actually contain only the needed exported symbols,
1009 # we have to build modules as well to determine what those symbols are.
1010 # (this can be evaluated only once include/config/auto.conf has been included)
1011 ifdef CONFIG_TRIM_UNUSED_KSYMS
1012   KBUILD_MODULES := 1
1013 endif
1014
1015 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1016
1017 $(autoksyms_h):
1018         $(Q)mkdir -p $(dir $@)
1019         $(Q)touch $@
1020
1021 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1022
1023 # Final link of vmlinux with optional arch pass after final link
1024 cmd_link-vmlinux =                                                 \
1025         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1026         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1027
1028 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1029         +$(call if_changed,link-vmlinux)
1030
1031 targets := vmlinux
1032
1033 # Build samples along the rest of the kernel. This needs headers_install.
1034 ifdef CONFIG_SAMPLES
1035 vmlinux-dirs += samples
1036 samples: headers_install
1037 endif
1038
1039 # The actual objects are generated when descending,
1040 # make sure no implicit rule kicks in
1041 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1042
1043 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1044 # Preset locale variables to speed up the build process. Limit locale
1045 # tweaks to this spot to avoid wrong language settings when running
1046 # make menuconfig etc.
1047 # Error messages still appears in the original language
1048
1049 PHONY += $(vmlinux-dirs)
1050 $(vmlinux-dirs): prepare
1051         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1052
1053 filechk_kernel.release = \
1054         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1055
1056 # Store (new) KERNELRELEASE string in include/config/kernel.release
1057 include/config/kernel.release: $(srctree)/Makefile FORCE
1058         $(call filechk,kernel.release)
1059
1060 # Additional helpers built in scripts/
1061 # Carefully list dependencies so we do not try to build scripts twice
1062 # in parallel
1063 PHONY += scripts
1064 scripts: scripts_basic scripts_dtc
1065         $(Q)$(MAKE) $(build)=$(@)
1066
1067 # Things we need to do before we recursively start building the kernel
1068 # or the modules are listed in "prepare".
1069 # A multi level approach is used. prepareN is processed before prepareN-1.
1070 # archprepare is used in arch Makefiles and when processed asm symlink,
1071 # version.h and scripts_basic is processed / created.
1072
1073 PHONY += prepare archprepare prepare1 prepare3
1074
1075 # prepare3 is used to check if we are building in a separate output directory,
1076 # and if so do:
1077 # 1) Check that make has not been executed in the kernel src $(srctree)
1078 prepare3: include/config/kernel.release
1079 ifneq ($(KBUILD_SRC),)
1080         @$(kecho) '  Using $(srctree) as source for kernel'
1081         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1082                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1083                 echo >&2 "  in the '$(srctree)' directory.";\
1084                 /bin/false; \
1085         fi;
1086 endif
1087
1088 prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
1089                                                 include/generated/utsrelease.h
1090         $(cmd_crmodverdir)
1091
1092 archprepare: archheaders archscripts prepare1 scripts
1093
1094 prepare0: archprepare
1095         $(Q)$(MAKE) $(build)=scripts/mod
1096         $(Q)$(MAKE) $(build)=.
1097
1098 # All the preparing..
1099 prepare: prepare0 prepare-objtool
1100
1101 # Support for using generic headers in asm-generic
1102 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1103
1104 PHONY += asm-generic uapi-asm-generic
1105 asm-generic: uapi-asm-generic
1106         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1107         generic=include/asm-generic
1108 uapi-asm-generic:
1109         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1110         generic=include/uapi/asm-generic
1111
1112 PHONY += prepare-objtool
1113 prepare-objtool: $(objtool_target)
1114 ifeq ($(SKIP_STACK_VALIDATION),1)
1115 ifdef CONFIG_UNWINDER_ORC
1116         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1117         @false
1118 else
1119         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1120 endif
1121 endif
1122
1123 # Generate some files
1124 # ---------------------------------------------------------------------------
1125
1126 # KERNELRELEASE can change from a few different places, meaning version.h
1127 # needs to be updated, so this check is forced on all builds
1128
1129 uts_len := 64
1130 define filechk_utsrelease.h
1131         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1132           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1133           exit 1;                                                         \
1134         fi;                                                               \
1135         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1136 endef
1137
1138 define filechk_version.h
1139         echo \#define LINUX_VERSION_CODE $(shell                         \
1140         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1141         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1142 endef
1143
1144 $(version_h): FORCE
1145         $(call filechk,version.h)
1146         $(Q)rm -f $(old_version_h)
1147
1148 include/generated/utsrelease.h: include/config/kernel.release FORCE
1149         $(call filechk,utsrelease.h)
1150
1151 PHONY += headerdep
1152 headerdep:
1153         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1154         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1155
1156 # ---------------------------------------------------------------------------
1157 # Kernel headers
1158
1159 #Default location for installed headers
1160 export INSTALL_HDR_PATH = $(objtree)/usr
1161
1162 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1163 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1164
1165 PHONY += archheaders archscripts
1166
1167 PHONY += __headers
1168 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1169         $(Q)$(MAKE) $(build)=scripts build_unifdef
1170
1171 PHONY += headers_install_all
1172 headers_install_all:
1173         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1174
1175 PHONY += headers_install
1176 headers_install: __headers
1177         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1178           $(error Headers not exportable for the $(SRCARCH) architecture))
1179         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1180         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1181
1182 PHONY += headers_check_all
1183 headers_check_all: headers_install_all
1184         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1185
1186 PHONY += headers_check
1187 headers_check: headers_install
1188         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1189         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1190
1191 ifdef CONFIG_HEADERS_CHECK
1192 all: headers_check
1193 endif
1194
1195 # ---------------------------------------------------------------------------
1196 # Kernel selftest
1197
1198 PHONY += kselftest
1199 kselftest:
1200         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1201
1202 PHONY += kselftest-clean
1203 kselftest-clean:
1204         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1205
1206 PHONY += kselftest-merge
1207 kselftest-merge:
1208         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1209         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1210                 -m $(objtree)/.config \
1211                 $(srctree)/tools/testing/selftests/*/config
1212         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1213
1214 # ---------------------------------------------------------------------------
1215 # Devicetree files
1216
1217 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1218 dtstree := arch/$(SRCARCH)/boot/dts
1219 endif
1220
1221 ifneq ($(dtstree),)
1222
1223 %.dtb: prepare3 scripts_dtc
1224         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1225
1226 PHONY += dtbs dtbs_install dt_binding_check
1227 dtbs dtbs_check: prepare3 scripts_dtc
1228         $(Q)$(MAKE) $(build)=$(dtstree)
1229
1230 dtbs_check: export CHECK_DTBS=1
1231 dtbs_check: dt_binding_check
1232
1233 dtbs_install:
1234         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1235
1236 ifdef CONFIG_OF_EARLY_FLATTREE
1237 all: dtbs
1238 endif
1239
1240 endif
1241
1242 PHONY += scripts_dtc
1243 scripts_dtc: scripts_basic
1244         $(Q)$(MAKE) $(build)=scripts/dtc
1245
1246 dt_binding_check: scripts_dtc
1247         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1248
1249 # ---------------------------------------------------------------------------
1250 # Modules
1251
1252 ifdef CONFIG_MODULES
1253
1254 # By default, build modules as well
1255
1256 all: modules
1257
1258 # Build modules
1259 #
1260 # A module can be listed more than once in obj-m resulting in
1261 # duplicate lines in modules.order files.  Those are removed
1262 # using awk while concatenating to the final file.
1263
1264 PHONY += modules
1265 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1266         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1267         @$(kecho) '  Building modules, stage 2.';
1268         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1269
1270 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1271         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1272
1273 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1274         $(Q)$(MAKE) $(modbuiltin)=$*
1275
1276
1277 # Target to prepare building external modules
1278 PHONY += modules_prepare
1279 modules_prepare: prepare
1280
1281 # Target to install modules
1282 PHONY += modules_install
1283 modules_install: _modinst_ _modinst_post
1284
1285 PHONY += _modinst_
1286 _modinst_:
1287         @rm -rf $(MODLIB)/kernel
1288         @rm -f $(MODLIB)/source
1289         @mkdir -p $(MODLIB)/kernel
1290         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1291         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1292                 rm -f $(MODLIB)/build ; \
1293                 ln -s $(CURDIR) $(MODLIB)/build ; \
1294         fi
1295         @cp -f $(objtree)/modules.order $(MODLIB)/
1296         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1297         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1298
1299 # This depmod is only for convenience to give the initial
1300 # boot a modules.dep even before / is mounted read-write.  However the
1301 # boot script depmod is the master version.
1302 PHONY += _modinst_post
1303 _modinst_post: _modinst_
1304         $(call cmd,depmod)
1305
1306 ifeq ($(CONFIG_MODULE_SIG), y)
1307 PHONY += modules_sign
1308 modules_sign:
1309         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1310 endif
1311
1312 else # CONFIG_MODULES
1313
1314 # Modules not configured
1315 # ---------------------------------------------------------------------------
1316
1317 PHONY += modules modules_install
1318 modules modules_install:
1319         @echo >&2
1320         @echo >&2 "The present kernel configuration has modules disabled."
1321         @echo >&2 "Type 'make config' and enable loadable module support."
1322         @echo >&2 "Then build a kernel with module support enabled."
1323         @echo >&2
1324         @exit 1
1325
1326 endif # CONFIG_MODULES
1327
1328 ###
1329 # Cleaning is done on three levels.
1330 # make clean     Delete most generated files
1331 #                Leave enough to build external modules
1332 # make mrproper  Delete the current configuration, and all generated files
1333 # make distclean Remove editor backup files, patch leftover files and the like
1334
1335 # Directories & files removed with 'make clean'
1336 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1337
1338 # Directories & files removed with 'make mrproper'
1339 MRPROPER_DIRS  += include/config usr/include include/generated          \
1340                   arch/*/include/generated .tmp_objdiff
1341 MRPROPER_FILES += .config .config.old .version \
1342                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1343                   signing_key.pem signing_key.priv signing_key.x509     \
1344                   x509.genkey extra_certificates signing_key.x509.keyid \
1345                   signing_key.x509.signer vmlinux-gdb.py
1346
1347 # clean - Delete most, but leave enough to build external modules
1348 #
1349 clean: rm-dirs  := $(CLEAN_DIRS)
1350 clean: rm-files := $(CLEAN_FILES)
1351 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1352
1353 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1354 $(clean-dirs):
1355         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1356
1357 vmlinuxclean:
1358         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1359         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1360
1361 clean: archclean vmlinuxclean
1362
1363 # mrproper - Delete all generated files, including .config
1364 #
1365 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1366 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1367 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1368
1369 PHONY += $(mrproper-dirs) mrproper
1370 $(mrproper-dirs):
1371         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1372
1373 mrproper: clean $(mrproper-dirs)
1374         $(call cmd,rmdirs)
1375         $(call cmd,rmfiles)
1376
1377 # distclean
1378 #
1379 PHONY += distclean
1380
1381 distclean: mrproper
1382         @find $(srctree) $(RCS_FIND_IGNORE) \
1383                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1384                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1385                 -o -name 'core' \) \
1386                 -type f -print | xargs rm -f
1387
1388
1389 # Packaging of the kernel to various formats
1390 # ---------------------------------------------------------------------------
1391 package-dir     := scripts/package
1392
1393 %src-pkg: FORCE
1394         $(Q)$(MAKE) $(build)=$(package-dir) $@
1395 %pkg: include/config/kernel.release FORCE
1396         $(Q)$(MAKE) $(build)=$(package-dir) $@
1397
1398
1399 # Brief documentation of the typical targets used
1400 # ---------------------------------------------------------------------------
1401
1402 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1403 boards := $(sort $(notdir $(boards)))
1404 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1405 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1406
1407 PHONY += help
1408 help:
1409         @echo  'Cleaning targets:'
1410         @echo  '  clean           - Remove most generated files but keep the config and'
1411         @echo  '                    enough build support to build external modules'
1412         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1413         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1414         @echo  ''
1415         @echo  'Configuration targets:'
1416         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1417         @echo  ''
1418         @echo  'Other generic targets:'
1419         @echo  '  all             - Build all targets marked with [*]'
1420         @echo  '* vmlinux         - Build the bare kernel'
1421         @echo  '* modules         - Build all modules'
1422         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1423         @echo  '  dir/            - Build all files in dir and below'
1424         @echo  '  dir/file.[ois]  - Build specified target only'
1425         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1426         @echo  '                    (requires compiler support for LLVM assembly generation)'
1427         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1428         @echo  '                    (requires a recent binutils and recent build (System.map))'
1429         @echo  '  dir/file.ko     - Build module including final link'
1430         @echo  '  modules_prepare - Set up for building external modules'
1431         @echo  '  tags/TAGS       - Generate tags file for editors'
1432         @echo  '  cscope          - Generate cscope index'
1433         @echo  '  gtags           - Generate GNU GLOBAL index'
1434         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1435         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1436         @echo  '  image_name      - Output the image name (use with make -s)'
1437         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1438          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1439          echo  ''
1440         @echo  'Static analysers:'
1441         @echo  '  checkstack      - Generate a list of stack hogs'
1442         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1443         @echo  '  versioncheck    - Sanity check on version.h usage'
1444         @echo  '  includecheck    - Check for duplicate included header files'
1445         @echo  '  export_report   - List the usages of all exported symbols'
1446         @echo  '  headers_check   - Sanity check on exported headers'
1447         @echo  '  headerdep       - Detect inclusion cycles in headers'
1448         @echo  '  coccicheck      - Check with Coccinelle'
1449         @echo  ''
1450         @echo  'Kernel selftest:'
1451         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1452         @echo  '                    Build, install, and boot kernel before'
1453         @echo  '                    running kselftest on it'
1454         @echo  '  kselftest-clean - Remove all generated kselftest files'
1455         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1456         @echo  '                    .config.'
1457         @echo  ''
1458         @$(if $(dtstree), \
1459                 echo 'Devicetree:'; \
1460                 echo '* dtbs            - Build device tree blobs for enabled boards'; \
1461                 echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1462                 echo '')
1463
1464         @echo 'Userspace tools targets:'
1465         @echo '  use "make tools/help"'
1466         @echo '  or  "cd tools; make help"'
1467         @echo  ''
1468         @echo  'Kernel packaging:'
1469         @$(MAKE) $(build)=$(package-dir) help
1470         @echo  ''
1471         @echo  'Documentation targets:'
1472         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1473         @echo  ''
1474         @echo  'Architecture specific targets ($(SRCARCH)):'
1475         @$(if $(archhelp),$(archhelp),\
1476                 echo '  No architecture specific help defined for $(SRCARCH)')
1477         @echo  ''
1478         @$(if $(boards), \
1479                 $(foreach b, $(boards), \
1480                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1481                 echo '')
1482         @$(if $(board-dirs), \
1483                 $(foreach b, $(board-dirs), \
1484                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1485                 printf "  %-16s - Show all of the above\\n" help-boards; \
1486                 echo '')
1487
1488         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1489         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1490         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1491         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1492         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1493         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1494         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1495         @echo  '                1: warnings which may be relevant and do not occur too often'
1496         @echo  '                2: warnings which occur quite often but may still be relevant'
1497         @echo  '                3: more obscure warnings, can most likely be ignored'
1498         @echo  '                Multiple levels can be combined with W=12 or W=123'
1499         @echo  ''
1500         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1501         @echo  'For further info see the ./README file'
1502
1503
1504 help-board-dirs := $(addprefix help-,$(board-dirs))
1505
1506 help-boards: $(help-board-dirs)
1507
1508 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1509
1510 $(help-board-dirs): help-%:
1511         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1512         @$(if $(boards-per-dir), \
1513                 $(foreach b, $(boards-per-dir), \
1514                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1515                 echo '')
1516
1517
1518 # Documentation targets
1519 # ---------------------------------------------------------------------------
1520 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1521                linkcheckdocs dochelp refcheckdocs
1522 PHONY += $(DOC_TARGETS)
1523 $(DOC_TARGETS): scripts_basic FORCE
1524         $(Q)$(MAKE) $(build)=Documentation $@
1525
1526 # Misc
1527 # ---------------------------------------------------------------------------
1528
1529 PHONY += scripts_gdb
1530 scripts_gdb: prepare
1531         $(Q)$(MAKE) $(build)=scripts/gdb
1532         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1533
1534 ifdef CONFIG_GDB_SCRIPTS
1535 all: scripts_gdb
1536 endif
1537
1538 else # KBUILD_EXTMOD
1539
1540 ###
1541 # External module support.
1542 # When building external modules the kernel used as basis is considered
1543 # read-only, and no consistency checks are made and the make
1544 # system is not used on the basis kernel. If updates are required
1545 # in the basis kernel ordinary make commands (without M=...) must
1546 # be used.
1547 #
1548 # The following are the only valid targets when building external
1549 # modules.
1550 # make M=dir clean     Delete all automatically generated files
1551 # make M=dir modules   Make all modules in specified dir
1552 # make M=dir           Same as 'make M=dir modules'
1553 # make M=dir modules_install
1554 #                      Install the modules built in the module directory
1555 #                      Assumes install directory is already created
1556
1557 # We are always building modules
1558 KBUILD_MODULES := 1
1559
1560 PHONY += $(objtree)/Module.symvers
1561 $(objtree)/Module.symvers:
1562         @test -e $(objtree)/Module.symvers || ( \
1563         echo; \
1564         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1565         echo "           is missing; modules will have no dependencies and modversions."; \
1566         echo )
1567
1568 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1569 PHONY += $(module-dirs) modules
1570 $(module-dirs): prepare $(objtree)/Module.symvers
1571         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1572
1573 modules: $(module-dirs)
1574         @$(kecho) '  Building modules, stage 2.';
1575         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1576
1577 PHONY += modules_install
1578 modules_install: _emodinst_ _emodinst_post
1579
1580 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1581 PHONY += _emodinst_
1582 _emodinst_:
1583         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1584         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1585
1586 PHONY += _emodinst_post
1587 _emodinst_post: _emodinst_
1588         $(call cmd,depmod)
1589
1590 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1591
1592 PHONY += $(clean-dirs) clean
1593 $(clean-dirs):
1594         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1595
1596 clean:  rm-dirs := $(MODVERDIR)
1597 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1598
1599 PHONY += help
1600 help:
1601         @echo  '  Building external modules.'
1602         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1603         @echo  ''
1604         @echo  '  modules         - default target, build the module(s)'
1605         @echo  '  modules_install - install the module'
1606         @echo  '  clean           - remove generated files in module directory only'
1607         @echo  ''
1608
1609 PHONY += prepare
1610 prepare:
1611         $(cmd_crmodverdir)
1612 endif # KBUILD_EXTMOD
1613
1614 clean: $(clean-dirs)
1615         $(call cmd,rmdirs)
1616         $(call cmd,rmfiles)
1617         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1618                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1619                 -o -name '*.ko.*' \
1620                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1621                 -o -name '*.dwo' -o -name '*.lst' \
1622                 -o -name '*.su'  \
1623                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1624                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1625                 -o -name '*.asn1.[ch]' \
1626                 -o -name '*.symtypes' -o -name 'modules.order' \
1627                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1628                 -o -name '*.c.[012]*.*' \
1629                 -o -name '*.ll' \
1630                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1631
1632 # Generate tags for editors
1633 # ---------------------------------------------------------------------------
1634 quiet_cmd_tags = GEN     $@
1635       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1636
1637 tags TAGS cscope gtags: FORCE
1638         $(call cmd,tags)
1639
1640 # Scripts to check various things for consistency
1641 # ---------------------------------------------------------------------------
1642
1643 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1644
1645 includecheck:
1646         find $(srctree)/* $(RCS_FIND_IGNORE) \
1647                 -name '*.[hcS]' -type f -print | sort \
1648                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1649
1650 versioncheck:
1651         find $(srctree)/* $(RCS_FIND_IGNORE) \
1652                 -name '*.[hcS]' -type f -print | sort \
1653                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1654
1655 coccicheck:
1656         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1657
1658 namespacecheck:
1659         $(PERL) $(srctree)/scripts/namespace.pl
1660
1661 export_report:
1662         $(PERL) $(srctree)/scripts/export_report.pl
1663
1664 PHONY += checkstack kernelrelease kernelversion image_name
1665
1666 # UML needs a little special treatment here.  It wants to use the host
1667 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1668 # else wants $(ARCH), including people doing cross-builds, which means
1669 # that $(SUBARCH) doesn't work here.
1670 ifeq ($(ARCH), um)
1671 CHECKSTACK_ARCH := $(SUBARCH)
1672 else
1673 CHECKSTACK_ARCH := $(ARCH)
1674 endif
1675 checkstack:
1676         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1677         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1678
1679 kernelrelease:
1680         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1681
1682 kernelversion:
1683         @echo $(KERNELVERSION)
1684
1685 image_name:
1686         @echo $(KBUILD_IMAGE)
1687
1688 # Clear a bunch of variables before executing the submake
1689
1690 ifeq ($(quiet),silent_)
1691 tools_silent=s
1692 endif
1693
1694 tools/: FORCE
1695         $(Q)mkdir -p $(objtree)/tools
1696         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1697
1698 tools/%: FORCE
1699         $(Q)mkdir -p $(objtree)/tools
1700         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1701
1702 # Single targets
1703 # ---------------------------------------------------------------------------
1704 # Single targets are compatible with:
1705 # - build with mixed source and output
1706 # - build with separate output dir 'make O=...'
1707 # - external modules
1708 #
1709 #  target-dir => where to store outputfile
1710 #  build-dir  => directory in kernel source tree to use
1711
1712 build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1713 build-dir = $(patsubst %/,%,$(dir $(build-target)))
1714
1715 %.i: prepare FORCE
1716         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1717 %.ll: prepare FORCE
1718         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1719 %.lst: prepare FORCE
1720         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1721 %.o: prepare FORCE
1722         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1723 %.s: prepare FORCE
1724         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1725 %.symtypes: prepare FORCE
1726         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1727 %.ko: %.o
1728         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1729
1730 # Modules
1731 PHONY += /
1732 /: ./
1733
1734 # Make sure the latest headers are built for Documentation
1735 Documentation/ samples/: headers_install
1736 %/: prepare FORCE
1737         $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir)
1738
1739 # FIXME Should go into a make.lib or something
1740 # ===========================================================================
1741
1742 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1743       cmd_rmdirs = rm -rf $(rm-dirs)
1744
1745 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1746       cmd_rmfiles = rm -f $(rm-files)
1747
1748 # Run depmod only if we have System.map and depmod is executable
1749 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1750       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1751                    $(KERNELRELEASE)
1752
1753 # Create temporary dir for module support files
1754 # clean it up only when building all modules
1755 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1756                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1757
1758 # read saved command lines for existing targets
1759 existing-targets := $(wildcard $(sort $(targets)))
1760
1761 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1762
1763 endif   # ifeq ($(config-targets),1)
1764 endif   # ifeq ($(mixed-targets),1)
1765 endif   # need-sub-make
1766
1767 PHONY += FORCE
1768 FORCE:
1769
1770 # Declare the contents of the PHONY variable as phony.  We keep that
1771 # information in a variable so we can use it in if_changed and friends.
1772 .PHONY: $(PHONY)