Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 18
   4 SUBLEVEL = 0
   5 EXTRAVERSION =
   6 NAME = Merciless Moray
   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 # o Do not use make's built-in rules and variables
  19 #   (this increases performance and avoids hard-to-debug behaviour);
  20 # o Look for make include files relative to root of kernel src
  21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23 # Avoid funny character set dependencies
  24 unexport LC_ALL
  25 LC_COLLATE=C
  26 LC_NUMERIC=C
  27 export LC_COLLATE LC_NUMERIC
  28
  29 # Avoid interference with shell env settings
  30 unexport GREP_OPTIONS
  31
  32 # We are using a recursive build, so we need to do a little thinking
  33 # to get the ordering right.
  34 #
  35 # Most importantly: sub-Makefiles should only ever modify files in
  36 # their own directory. If in some directory we have a dependency on
  37 # a file in another dir (which doesn't happen often, but it's often
  38 # unavoidable when linking the built-in.a targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 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 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Use make M=dir to specify directory of external module to build
 180 # Old syntax make ... SUBDIRS=$PWD is still supported
 181 # Setting the environment variable KBUILD_EXTMOD take precedence
 182 ifdef SUBDIRS
 183   KBUILD_EXTMOD ?= $(SUBDIRS)
 184 endif
 185
 186 ifeq ("$(origin M)", "command line")
 187   KBUILD_EXTMOD := $(M)
 188 endif
 189
 190 ifeq ($(KBUILD_SRC),)
 191         # building in the source tree
 192         srctree := .
 193 else
 194         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 195                 # building in a subdirectory of the source tree
 196                 srctree := ..
 197         else
 198                 srctree := $(KBUILD_SRC)
 199         endif
 200 endif
 201
 202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 203
 204 objtree         := .
 205 src             := $(srctree)
 206 obj             := $(objtree)
 207
 208 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 209
 210 export srctree objtree VPATH
 211
 212 # To make sure we do not include .config for any of the *config targets
 213 # catch them early, and hand them over to scripts/kconfig/Makefile
 214 # It is allowed to specify more targets when calling make, including
 215 # mixing *config targets and build targets.
 216 # For example 'make oldconfig all'.
 217 # Detect when mixed targets is specified, and make a second invocation
 218 # of make so .config is not included in this case either (for *config).
 219
 220 version_h := include/generated/uapi/linux/version.h
 221 old_version_h := include/linux/version.h
 222
 223 clean-targets := %clean mrproper cleandocs
 224 no-dot-config-targets := $(clean-targets) \
 225                          cscope gtags TAGS tags help% %docs check% coccicheck \
 226                          $(version_h) headers_% archheaders archscripts \
 227                          %asm-generic kernelversion %src-pkg
 228 no-sync-config-targets := $(no-dot-config-targets) install %install \
 229                            kernelrelease
 230
 231 config-targets  := 0
 232 mixed-targets   := 0
 233 dot-config      := 1
 234 may-sync-config := 1
 235
 236 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 237         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 238                 dot-config := 0
 239         endif
 240 endif
 241
 242 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 243         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 244                 may-sync-config := 0
 245         endif
 246 endif
 247
 248 ifneq ($(KBUILD_EXTMOD),)
 249         may-sync-config := 0
 250 endif
 251
 252 ifeq ($(KBUILD_EXTMOD),)
 253         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 254                 config-targets := 1
 255                 ifneq ($(words $(MAKECMDGOALS)),1)
 256                         mixed-targets := 1
 257                 endif
 258         endif
 259 endif
 260
 261 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 262 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 263         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 264                 mixed-targets := 1
 265         endif
 266 endif
 267
 268 # install and modules_install need also be processed one by one
 269 ifneq ($(filter install,$(MAKECMDGOALS)),)
 270         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 271                 mixed-targets := 1
 272         endif
 273 endif
 274
 275 ifeq ($(mixed-targets),1)
 276 # ===========================================================================
 277 # We're called with mixed targets (*config and build targets).
 278 # Handle them one by one.
 279
 280 PHONY += $(MAKECMDGOALS) __build_one_by_one
 281
 282 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 283         @:
 284
 285 __build_one_by_one:
 286         $(Q)set -e; \
 287         for i in $(MAKECMDGOALS); do \
 288                 $(MAKE) -f $(srctree)/Makefile $$i; \
 289         done
 290
 291 else
 292
 293 # We need some generic definitions (do not try to remake the file).
 294 scripts/Kbuild.include: ;
 295 include scripts/Kbuild.include
 296
 297 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 298 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 299 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 300 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 301
 302 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 303 # first, and if a usermode build is happening, the "ARCH=um" on the command
 304 # line overrides the setting of ARCH below.  If a native build is happening,
 305 # then ARCH is assigned, getting whatever value it gets normally, and
 306 # SUBARCH is subsequently ignored.
 307
 308 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 309                                   -e s/sun4u/sparc64/ \
 310                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 311                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 312                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 313                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
 314                                   -e s/riscv.*/riscv/)
 315
 316 # Cross compiling and selecting different set of gcc/bin-utils
 317 # ---------------------------------------------------------------------------
 318 #
 319 # When performing cross compilation for other architectures ARCH shall be set
 320 # to the target architecture. (See arch/* for the possibilities).
 321 # ARCH can be set during invocation of make:
 322 # make ARCH=ia64
 323 # Another way is to have ARCH set in the environment.
 324 # The default ARCH is the host where make is executed.
 325
 326 # CROSS_COMPILE specify the prefix used for all executables used
 327 # during compilation. Only gcc and related bin-utils executables
 328 # are prefixed with $(CROSS_COMPILE).
 329 # CROSS_COMPILE can be set on the command line
 330 # make CROSS_COMPILE=ia64-linux-
 331 # Alternatively CROSS_COMPILE can be set in the environment.
 332 # Default value for CROSS_COMPILE is not to prefix executables
 333 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 334 ARCH            ?= $(SUBARCH)
 335
 336 # Architecture as present in compile.h
 337 UTS_MACHINE     := $(ARCH)
 338 SRCARCH         := $(ARCH)
 339
 340 # Additional ARCH settings for x86
 341 ifeq ($(ARCH),i386)
 342         SRCARCH := x86
 343 endif
 344 ifeq ($(ARCH),x86_64)
 345         SRCARCH := x86
 346 endif
 347
 348 # Additional ARCH settings for sparc
 349 ifeq ($(ARCH),sparc32)
 350        SRCARCH := sparc
 351 endif
 352 ifeq ($(ARCH),sparc64)
 353        SRCARCH := sparc
 354 endif
 355
 356 # Additional ARCH settings for sh
 357 ifeq ($(ARCH),sh64)
 358        SRCARCH := sh
 359 endif
 360
 361 KCONFIG_CONFIG  ?= .config
 362 export KCONFIG_CONFIG
 363
 364 # SHELL used by kbuild
 365 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 366           else if [ -x /bin/bash ]; then echo /bin/bash; \
 367           else echo sh; fi ; fi)
 368
 369 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 370 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 371 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 372
 373 HOSTCC       = gcc
 374 HOSTCXX      = g++
 375 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 376                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 377                 $(HOSTCFLAGS)
 378 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 379 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 380 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 381
 382 # Make variables (CC, etc...)
 383 AS              = $(CROSS_COMPILE)as
 384 LD              = $(CROSS_COMPILE)ld
 385 CC              = $(CROSS_COMPILE)gcc
 386 CPP             = $(CC) -E
 387 AR              = $(CROSS_COMPILE)ar
 388 NM              = $(CROSS_COMPILE)nm
 389 STRIP           = $(CROSS_COMPILE)strip
 390 OBJCOPY         = $(CROSS_COMPILE)objcopy
 391 OBJDUMP         = $(CROSS_COMPILE)objdump
 392 LEX             = flex
 393 YACC            = bison
 394 AWK             = awk
 395 GENKSYMS        = scripts/genksyms/genksyms
 396 INSTALLKERNEL  := installkernel
 397 DEPMOD          = /sbin/depmod
 398 PERL            = perl
 399 PYTHON          = python
 400 PYTHON2         = python2
 401 PYTHON3         = python3
 402 CHECK           = sparse
 403
 404 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 405                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 406 NOSTDINC_FLAGS  =
 407 CFLAGS_MODULE   =
 408 AFLAGS_MODULE   =
 409 LDFLAGS_MODULE  =
 410 CFLAGS_KERNEL   =
 411 AFLAGS_KERNEL   =
 412 LDFLAGS_vmlinux =
 413
 414 # Use USERINCLUDE when you must reference the UAPI directories only.
 415 USERINCLUDE    := \
 416                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 417                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 418                 -I$(srctree)/include/uapi \
 419                 -I$(objtree)/include/generated/uapi \
 420                 -include $(srctree)/include/linux/kconfig.h
 421
 422 # Use LINUXINCLUDE when you must reference the include/ directory.
 423 # Needed to be compatible with the O= option
 424 LINUXINCLUDE    := \
 425                 -I$(srctree)/arch/$(SRCARCH)/include \
 426                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 427                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 428                 -I$(objtree)/include \
 429                 $(USERINCLUDE)
 430
 431 KBUILD_AFLAGS   := -D__ASSEMBLY__
 432 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 433                    -fno-strict-aliasing -fno-common -fshort-wchar \
 434                    -Werror-implicit-function-declaration \
 435                    -Wno-format-security \
 436                    -std=gnu89
 437 KBUILD_CPPFLAGS := -D__KERNEL__
 438 KBUILD_AFLAGS_KERNEL :=
 439 KBUILD_CFLAGS_KERNEL :=
 440 KBUILD_AFLAGS_MODULE  := -DMODULE
 441 KBUILD_CFLAGS_MODULE  := -DMODULE
 442 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 443 LDFLAGS :=
 444 GCC_PLUGINS_CFLAGS :=
 445
 446 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 447 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 448 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 449 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 450
 451 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 452 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 453 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 454 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 455 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 456 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 457 export KBUILD_ARFLAGS
 458
 459 # When compiling out-of-tree modules, put MODVERDIR in the module
 460 # tree rather than in the kernel tree. The kernel tree might
 461 # even be read-only.
 462 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 463
 464 # Files to ignore in find ... statements
 465
 466 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 467                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 468                           -prune -o
 469 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 470                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 471
 472 # ===========================================================================
 473 # Rules shared between *config targets and build targets
 474
 475 # Basic helpers built in scripts/basic/
 476 PHONY += scripts_basic
 477 scripts_basic:
 478         $(Q)$(MAKE) $(build)=scripts/basic
 479         $(Q)rm -f .tmp_quiet_recordmcount
 480
 481 # To avoid any implicit rule to kick in, define an empty command.
 482 scripts/basic/%: scripts_basic ;
 483
 484 PHONY += outputmakefile
 485 # outputmakefile generates a Makefile in the output directory, if using a
 486 # separate output directory. This allows convenient use of make in the
 487 # output directory.
 488 outputmakefile:
 489 ifneq ($(KBUILD_SRC),)
 490         $(Q)ln -fsn $(srctree) source
 491         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 492             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 493 endif
 494
 495 ifeq ($(cc-name),clang)
 496 ifneq ($(CROSS_COMPILE),)
 497 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 498 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 499 endif
 500 ifneq ($(GCC_TOOLCHAIN),)
 501 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 502 endif
 503 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 504 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 505 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 506 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 507 endif
 508
 509 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 510 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 511 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 512 export RETPOLINE_CFLAGS
 513
 514 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 515 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 516
 517 # check for 'asm goto'
 518 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 519   CC_HAVE_ASM_GOTO := 1
 520   KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 521   KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 522 endif
 523
 524 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 525 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 526 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 527 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 528 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 529
 530 ifeq ($(config-targets),1)
 531 # ===========================================================================
 532 # *config targets only - make sure prerequisites are updated, and descend
 533 # in scripts/kconfig to make the *config target
 534
 535 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 536 # KBUILD_DEFCONFIG may point out an alternative default configuration
 537 # used for 'make defconfig'
 538 include arch/$(SRCARCH)/Makefile
 539 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 540
 541 config: scripts_basic outputmakefile FORCE
 542         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 543
 544 %config: scripts_basic outputmakefile FORCE
 545         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 546
 547 else
 548 # ===========================================================================
 549 # Build targets only - this includes vmlinux, arch specific targets, clean
 550 # targets and others. In general all targets except *config targets.
 551
 552 # If building an external module we do not care about the all: rule
 553 # but instead _all depend on modules
 554 PHONY += all
 555 ifeq ($(KBUILD_EXTMOD),)
 556 _all: all
 557 else
 558 _all: modules
 559 endif
 560
 561 # Decide whether to build built-in, modular, or both.
 562 # Normally, just do built-in.
 563
 564 KBUILD_MODULES :=
 565 KBUILD_BUILTIN := 1
 566
 567 # If we have only "make modules", don't compile built-in objects.
 568 # When we're building modules with modversions, we need to consider
 569 # the built-in objects during the descend as well, in order to
 570 # make sure the checksums are up to date before we record them.
 571
 572 ifeq ($(MAKECMDGOALS),modules)
 573   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 574 endif
 575
 576 # If we have "make <whatever> modules", compile modules
 577 # in addition to whatever we do anyway.
 578 # Just "make" or "make all" shall build modules as well
 579
 580 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 581   KBUILD_MODULES := 1
 582 endif
 583
 584 ifeq ($(MAKECMDGOALS),)
 585   KBUILD_MODULES := 1
 586 endif
 587
 588 export KBUILD_MODULES KBUILD_BUILTIN
 589
 590 ifeq ($(KBUILD_EXTMOD),)
 591 # Objects we will link into vmlinux / subdirs we need to visit
 592 init-y          := init/
 593 drivers-y       := drivers/ sound/ firmware/
 594 net-y           := net/
 595 libs-y          := lib/
 596 core-y          := usr/
 597 virt-y          := virt/
 598 endif # KBUILD_EXTMOD
 599
 600 ifeq ($(dot-config),1)
 601 include include/config/auto.conf
 602 endif
 603
 604 # The all: target is the default when no target is given on the
 605 # command line.
 606 # This allow a user to issue only 'make' to build a kernel including modules
 607 # Defaults to vmlinux, but the arch makefile usually adds further targets
 608 all: vmlinux
 609
 610 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 611         $(call cc-option,-fno-tree-loop-im) \
 612         $(call cc-disable-warning,maybe-uninitialized,)
 613 export CFLAGS_GCOV
 614
 615 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 616 # values of the respective KBUILD_* variables
 617 ARCH_CPPFLAGS :=
 618 ARCH_AFLAGS :=
 619 ARCH_CFLAGS :=
 620 include arch/$(SRCARCH)/Makefile
 621
 622 ifeq ($(dot-config),1)
 623 ifeq ($(may-sync-config),1)
 624 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 625 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 626 # because some architectures define CROSS_COMPILE there.
 627 -include include/config/auto.conf.cmd
 628
 629 # To avoid any implicit rule to kick in, define an empty command
 630 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 631
 632 # The actual configuration files used during the build are stored in
 633 # include/generated/ and include/config/. Update them if .config is newer than
 634 # include/config/auto.conf (which mirrors .config).
 635 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 636         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 637 else
 638 # External modules and some install targets need include/generated/autoconf.h
 639 # and include/config/auto.conf but do not care if they are up-to-date.
 640 # Use auto.conf to trigger the test
 641 PHONY += include/config/auto.conf
 642
 643 include/config/auto.conf:
 644         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 645         echo >&2;                                                       \
 646         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 647         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 648         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 649         echo >&2 ;                                                      \
 650         /bin/false)
 651
 652 endif # may-sync-config
 653 endif # $(dot-config)
 654
 655 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 656 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 657 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 658 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 659 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 660
 661 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 662 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 663 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 664 else
 665 ifdef CONFIG_PROFILE_ALL_BRANCHES
 666 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 667 else
 668 KBUILD_CFLAGS   += -O2
 669 endif
 670 endif
 671
 672 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 673                         $(call cc-disable-warning,maybe-uninitialized,))
 674
 675 # Tell gcc to never replace conditional load with a non-conditional one
 676 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 677
 678 include scripts/Makefile.kcov
 679 include scripts/Makefile.gcc-plugins
 680
 681 ifdef CONFIG_READABLE_ASM
 682 # Disable optimizations that make assembler listings hard to read.
 683 # reorder blocks reorders the control in the function
 684 # ipa clone creates specialized cloned functions
 685 # partial inlining inlines only parts of functions
 686 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 687                  $(call cc-option,-fno-ipa-cp-clone,) \
 688                  $(call cc-option,-fno-partial-inlining)
 689 endif
 690
 691 ifneq ($(CONFIG_FRAME_WARN),0)
 692 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 693 endif
 694
 695 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 696 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 697 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 698
 699 KBUILD_CFLAGS += $(stackp-flags-y)
 700
 701 ifeq ($(cc-name),clang)
 702 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 703 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 704 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 705 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 706 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 707 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 708 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 709 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 710 # See modpost pattern 2
 711 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 712 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 713 else
 714
 715 # These warnings generated too much noise in a regular build.
 716 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 717 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 718 endif
 719
 720 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 721 ifdef CONFIG_FRAME_POINTER
 722 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 723 else
 724 # Some targets (ARM with Thumb2, for example), can't be built with frame
 725 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 726 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 727 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 728 # -fomit-frame-pointer with FUNCTION_TRACER.
 729 ifndef CONFIG_FUNCTION_TRACER
 730 KBUILD_CFLAGS   += -fomit-frame-pointer
 731 endif
 732 endif
 733
 734 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 735
 736 ifdef CONFIG_DEBUG_INFO
 737 ifdef CONFIG_DEBUG_INFO_SPLIT
 738 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 739 else
 740 KBUILD_CFLAGS   += -g
 741 endif
 742 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 743 endif
 744 ifdef CONFIG_DEBUG_INFO_DWARF4
 745 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 746 endif
 747
 748 ifdef CONFIG_DEBUG_INFO_REDUCED
 749 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 750                    $(call cc-option,-fno-var-tracking)
 751 endif
 752
 753 ifdef CONFIG_FUNCTION_TRACER
 754 ifndef CC_FLAGS_FTRACE
 755 CC_FLAGS_FTRACE := -pg
 756 endif
 757 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 758   # gcc 5 supports generating the mcount tables directly
 759   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 760     CC_FLAGS_FTRACE     += -mrecord-mcount
 761     export CC_USING_RECORD_MCOUNT := 1
 762   endif
 763   ifdef CONFIG_HAVE_NOP_MCOUNT
 764     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 765       CC_FLAGS_FTRACE   += -mnop-mcount
 766       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 767     endif
 768   endif
 769 endif
 770 ifdef CONFIG_HAVE_FENTRY
 771   ifeq ($(call cc-option-yn, -mfentry),y)
 772     CC_FLAGS_FTRACE     += -mfentry
 773     CC_FLAGS_USING      += -DCC_USING_FENTRY
 774   endif
 775 endif
 776 export CC_FLAGS_FTRACE
 777 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 778 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 779 ifdef CONFIG_DYNAMIC_FTRACE
 780         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 781                 BUILD_C_RECORDMCOUNT := y
 782                 export BUILD_C_RECORDMCOUNT
 783         endif
 784 endif
 785 endif
 786
 787 # We trigger additional mismatches with less inlining
 788 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 789 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 790 endif
 791
 792 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 793 KBUILD_CFLAGS_KERNEL    += $(call cc-option,-ffunction-sections,)
 794 KBUILD_CFLAGS_KERNEL    += $(call cc-option,-fdata-sections,)
 795 endif
 796
 797 # arch Makefile may override CC so keep this after arch Makefile is included
 798 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 799
 800 # warn about C99 declaration after statement
 801 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 802
 803 # disable pointer signed / unsigned warnings in gcc 4.0
 804 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 805
 806 # disable invalid "can't wrap" optimizations for signed / pointers
 807 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 808
 809 # clang sets -fmerge-all-constants by default as optimization, but this
 810 # is non-conforming behavior for C and in fact breaks the kernel, so we
 811 # need to disable it here generally.
 812 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 813
 814 # for gcc -fno-merge-all-constants disables everything, but it is fine
 815 # to have actual conforming behavior enabled.
 816 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 817
 818 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 819 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 820
 821 # conserve stack if available
 822 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 823
 824 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 825 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 826
 827 # require functions to have arguments in prototypes, not empty 'int foo()'
 828 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 829
 830 # Prohibit date/time macros, which would make the build non-deterministic
 831 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 832
 833 # enforce correct pointer usage
 834 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 835
 836 # Require designated initializers for all marked structures
 837 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 838
 839 # change __FILE__ to the relative path from the srctree
 840 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 841
 842 # use the deterministic mode of AR if available
 843 KBUILD_ARFLAGS := $(call ar-option,D)
 844
 845 include scripts/Makefile.kasan
 846 include scripts/Makefile.extrawarn
 847 include scripts/Makefile.ubsan
 848
 849 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 850 # last assignments
 851 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 852 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 853 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 854
 855 # Use --build-id when available.
 856 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 857 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 858 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 859
 860 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 861 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 862 endif
 863
 864 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 865 LDFLAGS_vmlinux += $(call ld-option, -X,)
 866 endif
 867
 868 # insure the checker run with the right endianness
 869 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 870
 871 # the checker needs the correct machine size
 872 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 873
 874 # Default kernel image to build when no specific target is given.
 875 # KBUILD_IMAGE may be overruled on the command line or
 876 # set in the environment
 877 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 878 # this default value
 879 export KBUILD_IMAGE ?= vmlinux
 880
 881 #
 882 # INSTALL_PATH specifies where to place the updated kernel and system map
 883 # images. Default is /boot, but you can set it to other values
 884 export  INSTALL_PATH ?= /boot
 885
 886 #
 887 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 888 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 889 # an argument if needed. Otherwise it defaults to the kernel install path
 890 #
 891 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 892
 893 #
 894 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 895 # relocations required by build roots.  This is not defined in the
 896 # makefile but the argument can be passed to make if needed.
 897 #
 898
 899 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 900 export MODLIB
 901
 902 #
 903 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 904 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 905 # the default option --strip-debug will be used.  Otherwise,
 906 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 907
 908 ifdef INSTALL_MOD_STRIP
 909 ifeq ($(INSTALL_MOD_STRIP),1)
 910 mod_strip_cmd = $(STRIP) --strip-debug
 911 else
 912 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 913 endif # INSTALL_MOD_STRIP=1
 914 else
 915 mod_strip_cmd = true
 916 endif # INSTALL_MOD_STRIP
 917 export mod_strip_cmd
 918
 919 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 920 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 921 # or CONFIG_MODULE_COMPRESS_XZ.
 922
 923 mod_compress_cmd = true
 924 ifdef CONFIG_MODULE_COMPRESS
 925   ifdef CONFIG_MODULE_COMPRESS_GZIP
 926     mod_compress_cmd = gzip -n -f
 927   endif # CONFIG_MODULE_COMPRESS_GZIP
 928   ifdef CONFIG_MODULE_COMPRESS_XZ
 929     mod_compress_cmd = xz -f
 930   endif # CONFIG_MODULE_COMPRESS_XZ
 931 endif # CONFIG_MODULE_COMPRESS
 932 export mod_compress_cmd
 933
 934 # Select initial ramdisk compression format, default is gzip(1).
 935 # This shall be used by the dracut(8) tool while creating an initramfs image.
 936 #
 937 INITRD_COMPRESS-y                  := gzip
 938 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 939 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 940 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 941 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 942 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 943 # do not export INITRD_COMPRESS, since we didn't actually
 944 # choose a sane default compression above.
 945 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 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 ifdef CONFIG_STACK_VALIDATION
 957   has_libelf := $(call try-run,\
 958                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 959   ifeq ($(has_libelf),1)
 960     objtool_target := tools/objtool FORCE
 961   else
 962     ifdef CONFIG_UNWINDER_ORC
 963       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 964     else
 965       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 966     endif
 967     SKIP_STACK_VALIDATION := 1
 968     export SKIP_STACK_VALIDATION
 969   endif
 970 endif
 971
 972
 973 ifeq ($(KBUILD_EXTMOD),)
 974 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 975
 976 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 977                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 978                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 979
 980 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 981                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 982
 983 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 984 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 985 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 986 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 987 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 988 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 989 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 990
 991 # Externally visible symbols (used by link-vmlinux.sh)
 992 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 993 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 994 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 995 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 996 export LDFLAGS_vmlinux
 997 # used by scripts/package/Makefile
 998 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 999
1000 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1001
1002 # Recurse until adjust_autoksyms.sh is satisfied
1003 PHONY += autoksyms_recursive
1004 autoksyms_recursive: $(vmlinux-deps)
1005 ifdef CONFIG_TRIM_UNUSED_KSYMS
1006         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1007           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1008 endif
1009
1010 # For the kernel to actually contain only the needed exported symbols,
1011 # we have to build modules as well to determine what those symbols are.
1012 # (this can be evaluated only once include/config/auto.conf has been included)
1013 ifdef CONFIG_TRIM_UNUSED_KSYMS
1014   KBUILD_MODULES := 1
1015 endif
1016
1017 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1018
1019 $(autoksyms_h):
1020         $(Q)mkdir -p $(dir $@)
1021         $(Q)touch $@
1022
1023 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1024
1025 # Final link of vmlinux with optional arch pass after final link
1026 cmd_link-vmlinux =                                                 \
1027         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1028         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1029
1030 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1031 ifdef CONFIG_HEADERS_CHECK
1032         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1033 endif
1034 ifdef CONFIG_GDB_SCRIPTS
1035         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1036 endif
1037         +$(call if_changed,link-vmlinux)
1038
1039 # Build samples along the rest of the kernel. This needs headers_install.
1040 ifdef CONFIG_SAMPLES
1041 vmlinux-dirs += samples
1042 samples: headers_install
1043 endif
1044
1045 # The actual objects are generated when descending,
1046 # make sure no implicit rule kicks in
1047 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1048
1049 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1050 # Preset locale variables to speed up the build process. Limit locale
1051 # tweaks to this spot to avoid wrong language settings when running
1052 # make menuconfig etc.
1053 # Error messages still appears in the original language
1054
1055 PHONY += $(vmlinux-dirs)
1056 $(vmlinux-dirs): prepare scripts
1057         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1058
1059 define filechk_kernel.release
1060         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1061 endef
1062
1063 # Store (new) KERNELRELEASE string in include/config/kernel.release
1064 include/config/kernel.release: $(srctree)/Makefile FORCE
1065         $(call filechk,kernel.release)
1066
1067 # Additional helpers built in scripts/
1068 # Carefully list dependencies so we do not try to build scripts twice
1069 # in parallel
1070 PHONY += scripts
1071 scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h)
1072         $(Q)$(MAKE) $(build)=$(@)
1073
1074 # Things we need to do before we recursively start building the kernel
1075 # or the modules are listed in "prepare".
1076 # A multi level approach is used. prepareN is processed before prepareN-1.
1077 # archprepare is used in arch Makefiles and when processed asm symlink,
1078 # version.h and scripts_basic is processed / created.
1079
1080 # Listed in dependency order
1081 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1082
1083 # prepare3 is used to check if we are building in a separate output directory,
1084 # and if so do:
1085 # 1) Check that make has not been executed in the kernel src $(srctree)
1086 prepare3: include/config/kernel.release
1087 ifneq ($(KBUILD_SRC),)
1088         @$(kecho) '  Using $(srctree) as source for kernel'
1089         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1090                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1091                 echo >&2 "  in the '$(srctree)' directory.";\
1092                 /bin/false; \
1093         fi;
1094 endif
1095
1096 # prepare2 creates a makefile if using a separate output directory.
1097 # From this point forward, .config has been reprocessed, so any rules
1098 # that need to depend on updated CONFIG_* values can be checked here.
1099 prepare2: prepare3 outputmakefile asm-generic
1100
1101 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1102         $(cmd_crmodverdir)
1103
1104 archprepare: archheaders archscripts prepare1 scripts_basic
1105
1106 prepare0: archprepare gcc-plugins
1107         $(Q)$(MAKE) $(build)=.
1108
1109 # All the preparing..
1110 prepare: prepare0 prepare-objtool
1111
1112 # Support for using generic headers in asm-generic
1113 PHONY += asm-generic uapi-asm-generic
1114 asm-generic: uapi-asm-generic
1115         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1116                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1117 uapi-asm-generic:
1118         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1119                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1120
1121 PHONY += prepare-objtool
1122 prepare-objtool: $(objtool_target)
1123
1124 # Generate some files
1125 # ---------------------------------------------------------------------------
1126
1127 # KERNELRELEASE can change from a few different places, meaning version.h
1128 # needs to be updated, so this check is forced on all builds
1129
1130 uts_len := 64
1131 define filechk_utsrelease.h
1132         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1133           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1134           exit 1;                                                         \
1135         fi;                                                               \
1136         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1137 endef
1138
1139 define filechk_version.h
1140         (echo \#define LINUX_VERSION_CODE $(shell                         \
1141         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1142         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1143 endef
1144
1145 $(version_h): FORCE
1146         $(call filechk,version.h)
1147         $(Q)rm -f $(old_version_h)
1148
1149 include/generated/utsrelease.h: include/config/kernel.release FORCE
1150         $(call filechk,utsrelease.h)
1151
1152 PHONY += headerdep
1153 headerdep:
1154         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1155         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1156
1157 # ---------------------------------------------------------------------------
1158 # Kernel headers
1159
1160 #Default location for installed headers
1161 export INSTALL_HDR_PATH = $(objtree)/usr
1162
1163 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1164 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1165
1166 PHONY += archheaders
1167 archheaders:
1168
1169 PHONY += archscripts
1170 archscripts:
1171
1172 PHONY += __headers
1173 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1174         $(Q)$(MAKE) $(build)=scripts build_unifdef
1175
1176 PHONY += headers_install_all
1177 headers_install_all:
1178         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1179
1180 PHONY += headers_install
1181 headers_install: __headers
1182         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1183           $(error Headers not exportable for the $(SRCARCH) architecture))
1184         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1185         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1186
1187 PHONY += headers_check_all
1188 headers_check_all: headers_install_all
1189         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1190
1191 PHONY += headers_check
1192 headers_check: headers_install
1193         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1194         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1195
1196 # ---------------------------------------------------------------------------
1197 # Kernel selftest
1198
1199 PHONY += kselftest
1200 kselftest:
1201         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1202
1203 PHONY += kselftest-clean
1204 kselftest-clean:
1205         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1206
1207 PHONY += kselftest-merge
1208 kselftest-merge:
1209         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1210         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1211                 -m $(objtree)/.config \
1212                 $(srctree)/tools/testing/selftests/*/config
1213         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1214
1215 # ---------------------------------------------------------------------------
1216 # Modules
1217
1218 ifdef CONFIG_MODULES
1219
1220 # By default, build modules as well
1221
1222 all: modules
1223
1224 # Build modules
1225 #
1226 # A module can be listed more than once in obj-m resulting in
1227 # duplicate lines in modules.order files.  Those are removed
1228 # using awk while concatenating to the final file.
1229
1230 PHONY += modules
1231 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1232         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1233         @$(kecho) '  Building modules, stage 2.';
1234         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1235
1236 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1237         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1238
1239 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1240         $(Q)$(MAKE) $(modbuiltin)=$*
1241
1242
1243 # Target to prepare building external modules
1244 PHONY += modules_prepare
1245 modules_prepare: prepare scripts
1246
1247 # Target to install modules
1248 PHONY += modules_install
1249 modules_install: _modinst_ _modinst_post
1250
1251 PHONY += _modinst_
1252 _modinst_:
1253         @rm -rf $(MODLIB)/kernel
1254         @rm -f $(MODLIB)/source
1255         @mkdir -p $(MODLIB)/kernel
1256         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1257         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1258                 rm -f $(MODLIB)/build ; \
1259                 ln -s $(CURDIR) $(MODLIB)/build ; \
1260         fi
1261         @cp -f $(objtree)/modules.order $(MODLIB)/
1262         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1263         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1264
1265 # This depmod is only for convenience to give the initial
1266 # boot a modules.dep even before / is mounted read-write.  However the
1267 # boot script depmod is the master version.
1268 PHONY += _modinst_post
1269 _modinst_post: _modinst_
1270         $(call cmd,depmod)
1271
1272 ifeq ($(CONFIG_MODULE_SIG), y)
1273 PHONY += modules_sign
1274 modules_sign:
1275         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1276 endif
1277
1278 else # CONFIG_MODULES
1279
1280 # Modules not configured
1281 # ---------------------------------------------------------------------------
1282
1283 PHONY += modules modules_install
1284 modules modules_install:
1285         @echo >&2
1286         @echo >&2 "The present kernel configuration has modules disabled."
1287         @echo >&2 "Type 'make config' and enable loadable module support."
1288         @echo >&2 "Then build a kernel with module support enabled."
1289         @echo >&2
1290         @exit 1
1291
1292 endif # CONFIG_MODULES
1293
1294 ###
1295 # Cleaning is done on three levels.
1296 # make clean     Delete most generated files
1297 #                Leave enough to build external modules
1298 # make mrproper  Delete the current configuration, and all generated files
1299 # make distclean Remove editor backup files, patch leftover files and the like
1300
1301 # Directories & files removed with 'make clean'
1302 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1303
1304 # Directories & files removed with 'make mrproper'
1305 MRPROPER_DIRS  += include/config usr/include include/generated          \
1306                   arch/*/include/generated .tmp_objdiff
1307 MRPROPER_FILES += .config .config.old .version \
1308                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1309                   signing_key.pem signing_key.priv signing_key.x509     \
1310                   x509.genkey extra_certificates signing_key.x509.keyid \
1311                   signing_key.x509.signer vmlinux-gdb.py
1312
1313 # clean - Delete most, but leave enough to build external modules
1314 #
1315 clean: rm-dirs  := $(CLEAN_DIRS)
1316 clean: rm-files := $(CLEAN_FILES)
1317 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1318
1319 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1320 $(clean-dirs):
1321         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1322
1323 vmlinuxclean:
1324         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1325         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1326
1327 clean: archclean vmlinuxclean
1328
1329 # mrproper - Delete all generated files, including .config
1330 #
1331 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1332 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1333 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1334
1335 PHONY += $(mrproper-dirs) mrproper archmrproper
1336 $(mrproper-dirs):
1337         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1338
1339 mrproper: clean archmrproper $(mrproper-dirs)
1340         $(call cmd,rmdirs)
1341         $(call cmd,rmfiles)
1342
1343 # distclean
1344 #
1345 PHONY += distclean
1346
1347 distclean: mrproper
1348         @find $(srctree) $(RCS_FIND_IGNORE) \
1349                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1350                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1351                 -o -name 'core' \) \
1352                 -type f -print | xargs rm -f
1353
1354
1355 # Packaging of the kernel to various formats
1356 # ---------------------------------------------------------------------------
1357 # rpm target kept for backward compatibility
1358 package-dir     := scripts/package
1359
1360 %src-pkg: FORCE
1361         $(Q)$(MAKE) $(build)=$(package-dir) $@
1362 %pkg: include/config/kernel.release FORCE
1363         $(Q)$(MAKE) $(build)=$(package-dir) $@
1364 rpm: rpm-pkg
1365         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1366         @echo "           Please use \"rpm-pkg\" instead."
1367
1368
1369 # Brief documentation of the typical targets used
1370 # ---------------------------------------------------------------------------
1371
1372 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1373 boards := $(sort $(notdir $(boards)))
1374 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1375 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1376
1377 PHONY += help
1378 help:
1379         @echo  'Cleaning targets:'
1380         @echo  '  clean           - Remove most generated files but keep the config and'
1381         @echo  '                    enough build support to build external modules'
1382         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1383         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1384         @echo  ''
1385         @echo  'Configuration targets:'
1386         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1387         @echo  ''
1388         @echo  'Other generic targets:'
1389         @echo  '  all             - Build all targets marked with [*]'
1390         @echo  '* vmlinux         - Build the bare kernel'
1391         @echo  '* modules         - Build all modules'
1392         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1393         @echo  '  dir/            - Build all files in dir and below'
1394         @echo  '  dir/file.[ois]  - Build specified target only'
1395         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1396         @echo  '                    (requires compiler support for LLVM assembly generation)'
1397         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1398         @echo  '                    (requires a recent binutils and recent build (System.map))'
1399         @echo  '  dir/file.ko     - Build module including final link'
1400         @echo  '  modules_prepare - Set up for building external modules'
1401         @echo  '  tags/TAGS       - Generate tags file for editors'
1402         @echo  '  cscope          - Generate cscope index'
1403         @echo  '  gtags           - Generate GNU GLOBAL index'
1404         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1405         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1406         @echo  '  image_name      - Output the image name (use with make -s)'
1407         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1408          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1409          echo  ''
1410         @echo  'Static analysers:'
1411         @echo  '  checkstack      - Generate a list of stack hogs'
1412         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1413         @echo  '  versioncheck    - Sanity check on version.h usage'
1414         @echo  '  includecheck    - Check for duplicate included header files'
1415         @echo  '  export_report   - List the usages of all exported symbols'
1416         @echo  '  headers_check   - Sanity check on exported headers'
1417         @echo  '  headerdep       - Detect inclusion cycles in headers'
1418         @echo  '  coccicheck      - Check with Coccinelle'
1419         @echo  ''
1420         @echo  'Kernel selftest:'
1421         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1422         @echo  '                    Build, install, and boot kernel before'
1423         @echo  '                    running kselftest on it'
1424         @echo  '  kselftest-clean - Remove all generated kselftest files'
1425         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1426         @echo  '                    .config.'
1427         @echo  ''
1428         @echo 'Userspace tools targets:'
1429         @echo '  use "make tools/help"'
1430         @echo '  or  "cd tools; make help"'
1431         @echo  ''
1432         @echo  'Kernel packaging:'
1433         @$(MAKE) $(build)=$(package-dir) help
1434         @echo  ''
1435         @echo  'Documentation targets:'
1436         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1437         @echo  ''
1438         @echo  'Architecture specific targets ($(SRCARCH)):'
1439         @$(if $(archhelp),$(archhelp),\
1440                 echo '  No architecture specific help defined for $(SRCARCH)')
1441         @echo  ''
1442         @$(if $(boards), \
1443                 $(foreach b, $(boards), \
1444                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1445                 echo '')
1446         @$(if $(board-dirs), \
1447                 $(foreach b, $(board-dirs), \
1448                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1449                 printf "  %-16s - Show all of the above\\n" help-boards; \
1450                 echo '')
1451
1452         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1453         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1454         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1455         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1456         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1457         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1458         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1459         @echo  '                1: warnings which may be relevant and do not occur too often'
1460         @echo  '                2: warnings which occur quite often but may still be relevant'
1461         @echo  '                3: more obscure warnings, can most likely be ignored'
1462         @echo  '                Multiple levels can be combined with W=12 or W=123'
1463         @echo  ''
1464         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1465         @echo  'For further info see the ./README file'
1466
1467
1468 help-board-dirs := $(addprefix help-,$(board-dirs))
1469
1470 help-boards: $(help-board-dirs)
1471
1472 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1473
1474 $(help-board-dirs): help-%:
1475         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1476         @$(if $(boards-per-dir), \
1477                 $(foreach b, $(boards-per-dir), \
1478                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1479                 echo '')
1480
1481
1482 # Documentation targets
1483 # ---------------------------------------------------------------------------
1484 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1485                linkcheckdocs dochelp refcheckdocs
1486 PHONY += $(DOC_TARGETS)
1487 $(DOC_TARGETS): scripts_basic FORCE
1488         $(Q)$(MAKE) $(build)=Documentation $@
1489
1490 else # KBUILD_EXTMOD
1491
1492 ###
1493 # External module support.
1494 # When building external modules the kernel used as basis is considered
1495 # read-only, and no consistency checks are made and the make
1496 # system is not used on the basis kernel. If updates are required
1497 # in the basis kernel ordinary make commands (without M=...) must
1498 # be used.
1499 #
1500 # The following are the only valid targets when building external
1501 # modules.
1502 # make M=dir clean     Delete all automatically generated files
1503 # make M=dir modules   Make all modules in specified dir
1504 # make M=dir           Same as 'make M=dir modules'
1505 # make M=dir modules_install
1506 #                      Install the modules built in the module directory
1507 #                      Assumes install directory is already created
1508
1509 # We are always building modules
1510 KBUILD_MODULES := 1
1511 PHONY += crmodverdir
1512 crmodverdir:
1513         $(cmd_crmodverdir)
1514
1515 PHONY += $(objtree)/Module.symvers
1516 $(objtree)/Module.symvers:
1517         @test -e $(objtree)/Module.symvers || ( \
1518         echo; \
1519         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1520         echo "           is missing; modules will have no dependencies and modversions."; \
1521         echo )
1522
1523 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1524 PHONY += $(module-dirs) modules
1525 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1526         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1527
1528 modules: $(module-dirs)
1529         @$(kecho) '  Building modules, stage 2.';
1530         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1531
1532 PHONY += modules_install
1533 modules_install: _emodinst_ _emodinst_post
1534
1535 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1536 PHONY += _emodinst_
1537 _emodinst_:
1538         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1539         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1540
1541 PHONY += _emodinst_post
1542 _emodinst_post: _emodinst_
1543         $(call cmd,depmod)
1544
1545 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1546
1547 PHONY += $(clean-dirs) clean
1548 $(clean-dirs):
1549         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1550
1551 clean:  rm-dirs := $(MODVERDIR)
1552 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1553
1554 PHONY += help
1555 help:
1556         @echo  '  Building external modules.'
1557         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1558         @echo  ''
1559         @echo  '  modules         - default target, build the module(s)'
1560         @echo  '  modules_install - install the module'
1561         @echo  '  clean           - remove generated files in module directory only'
1562         @echo  ''
1563
1564 # Dummies...
1565 PHONY += prepare scripts
1566 prepare: ;
1567 scripts: ;
1568 endif # KBUILD_EXTMOD
1569
1570 clean: $(clean-dirs)
1571         $(call cmd,rmdirs)
1572         $(call cmd,rmfiles)
1573         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1574                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1575                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1576                 -o -name '*.dwo' -o -name '*.lst' \
1577                 -o -name '*.su'  \
1578                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1579                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1580                 -o -name '*.asn1.[ch]' \
1581                 -o -name '*.symtypes' -o -name 'modules.order' \
1582                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1583                 -o -name '*.c.[012]*.*' \
1584                 -o -name '*.ll' \
1585                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1586
1587 # Generate tags for editors
1588 # ---------------------------------------------------------------------------
1589 quiet_cmd_tags = GEN     $@
1590       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1591
1592 tags TAGS cscope gtags: FORCE
1593         $(call cmd,tags)
1594
1595 # Scripts to check various things for consistency
1596 # ---------------------------------------------------------------------------
1597
1598 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1599
1600 includecheck:
1601         find $(srctree)/* $(RCS_FIND_IGNORE) \
1602                 -name '*.[hcS]' -type f -print | sort \
1603                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1604
1605 versioncheck:
1606         find $(srctree)/* $(RCS_FIND_IGNORE) \
1607                 -name '*.[hcS]' -type f -print | sort \
1608                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1609
1610 coccicheck:
1611         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1612
1613 namespacecheck:
1614         $(PERL) $(srctree)/scripts/namespace.pl
1615
1616 export_report:
1617         $(PERL) $(srctree)/scripts/export_report.pl
1618
1619 endif #ifeq ($(config-targets),1)
1620 endif #ifeq ($(mixed-targets),1)
1621
1622 PHONY += checkstack kernelrelease kernelversion image_name
1623
1624 # UML needs a little special treatment here.  It wants to use the host
1625 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1626 # else wants $(ARCH), including people doing cross-builds, which means
1627 # that $(SUBARCH) doesn't work here.
1628 ifeq ($(ARCH), um)
1629 CHECKSTACK_ARCH := $(SUBARCH)
1630 else
1631 CHECKSTACK_ARCH := $(ARCH)
1632 endif
1633 checkstack:
1634         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1635         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1636
1637 kernelrelease:
1638         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1639
1640 kernelversion:
1641         @echo $(KERNELVERSION)
1642
1643 image_name:
1644         @echo $(KBUILD_IMAGE)
1645
1646 # Clear a bunch of variables before executing the submake
1647 tools/: FORCE
1648         $(Q)mkdir -p $(objtree)/tools
1649         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1650
1651 tools/%: FORCE
1652         $(Q)mkdir -p $(objtree)/tools
1653         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1654
1655 # Single targets
1656 # ---------------------------------------------------------------------------
1657 # Single targets are compatible with:
1658 # - build with mixed source and output
1659 # - build with separate output dir 'make O=...'
1660 # - external modules
1661 #
1662 #  target-dir => where to store outputfile
1663 #  build-dir  => directory in kernel source tree to use
1664
1665 ifeq ($(KBUILD_EXTMOD),)
1666         build-dir  = $(patsubst %/,%,$(dir $@))
1667         target-dir = $(dir $@)
1668 else
1669         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1670         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1671         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1672 endif
1673
1674 %.s: %.c prepare scripts FORCE
1675         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1676 %.i: %.c prepare scripts FORCE
1677         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1678 %.o: %.c prepare scripts FORCE
1679         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1680 %.lst: %.c prepare scripts FORCE
1681         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1682 %.s: %.S prepare scripts FORCE
1683         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1684 %.o: %.S prepare scripts FORCE
1685         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1686 %.symtypes: %.c prepare scripts FORCE
1687         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1688 %.ll: %.c prepare scripts FORCE
1689         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1690
1691 # Modules
1692 /: prepare scripts FORCE
1693         $(cmd_crmodverdir)
1694         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1695         $(build)=$(build-dir)
1696 # Make sure the latest headers are built for Documentation
1697 Documentation/ samples/: headers_install
1698 %/: prepare scripts FORCE
1699         $(cmd_crmodverdir)
1700         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1701         $(build)=$(build-dir)
1702 %.ko: prepare scripts FORCE
1703         $(cmd_crmodverdir)
1704         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1705         $(build)=$(build-dir) $(@:.ko=.o)
1706         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1707
1708 # FIXME Should go into a make.lib or something
1709 # ===========================================================================
1710
1711 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1712       cmd_rmdirs = rm -rf $(rm-dirs)
1713
1714 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1715       cmd_rmfiles = rm -f $(rm-files)
1716
1717 # Run depmod only if we have System.map and depmod is executable
1718 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1719       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1720                    $(KERNELRELEASE)
1721
1722 # Create temporary dir for module support files
1723 # clean it up only when building all modules
1724 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1725                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1726
1727 # read all saved command lines
1728
1729 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1730
1731 ifneq ($(cmd_files),)
1732   $(cmd_files): ;       # Do not try to update included dependency files
1733   include $(cmd_files)
1734 endif
1735
1736 endif   # skip-makefile
1737
1738 PHONY += FORCE
1739 FORCE:
1740
1741 # Declare the contents of the PHONY variable as phony.  We keep that
1742 # information in a variable so we can use it in if_changed and friends.
1743 .PHONY: $(PHONY)