Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 9
   3 SUBLEVEL = 261
   4 EXTRAVERSION =
   5 NAME = Roaring Lionus
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # o Do not use make's built-in rules and variables
  14 #   (this increases performance and avoids hard-to-debug behaviour);
  15 # o Look for make include files relative to root of kernel src
  16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  17
  18 # Avoid funny character set dependencies
  19 unexport LC_ALL
  20 LC_COLLATE=C
  21 LC_NUMERIC=C
  22 export LC_COLLATE LC_NUMERIC
  23
  24 # Avoid interference with shell env settings
  25 unexport GREP_OPTIONS
  26
  27 # We are using a recursive build, so we need to do a little thinking
  28 # to get the ordering right.
  29 #
  30 # Most importantly: sub-Makefiles should only ever modify files in
  31 # their own directory. If in some directory we have a dependency on
  32 # a file in another dir (which doesn't happen often, but it's often
  33 # unavoidable when linking the built-in.o targets which finally
  34 # turn into vmlinux), we will call a sub make in that other dir, and
  35 # after that we are sure that everything which is in that other dir
  36 # is now up to date.
  37 #
  38 # The only cases where we need to modify files which have global
  39 # effects are thus separated out and done before the recursive
  40 # descending is started. They are now explicitly listed as the
  41 # prepare rule.
  42
  43 # Beautify output
  44 # ---------------------------------------------------------------------------
  45 #
  46 # Normally, we echo the whole command before executing it. By making
  47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  48 # $(quiet) to choose other forms of output instead, e.g.
  49 #
  50 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  51 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  52 #
  53 # If $(quiet) is empty, the whole command will be printed.
  54 # If it is set to "quiet_", only the short version will be printed.
  55 # If it is set to "silent_", nothing will be printed at all, since
  56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  57 #
  58 # A simple variant is to prefix commands with $(Q) - that's useful
  59 # for commands that shall be hidden in non-verbose mode.
  60 #
  61 #       $(Q)ln $@ :<
  62 #
  63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  65 #
  66 # To put more focus on warnings, be less verbose as default
  67 # Use 'make V=1' to see the full commands
  68
  69 ifeq ("$(origin V)", "command line")
  70   KBUILD_VERBOSE = $(V)
  71 endif
  72 ifndef KBUILD_VERBOSE
  73   KBUILD_VERBOSE = 0
  74 endif
  75
  76 ifeq ($(KBUILD_VERBOSE),1)
  77   quiet =
  78   Q =
  79 else
  80   quiet=quiet_
  81   Q = @
  82 endif
  83
  84 # If the user is running make -s (silent mode), suppress echoing of
  85 # commands
  86
  87 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
  88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  89   quiet=silent_
  90   tools_silent=s
  91 endif
  92 else                                    # make-3.8x
  93 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  94   quiet=silent_
  95   tools_silent=-s
  96 endif
  97 endif
  98
  99 export quiet Q KBUILD_VERBOSE
 100
 101 # kbuild supports saving output files in a separate directory.
 102 # To locate output files in a separate directory two syntaxes are supported.
 103 # In both cases the working directory must be the root of the kernel src.
 104 # 1) O=
 105 # Use "make O=dir/to/store/output/files/"
 106 #
 107 # 2) Set KBUILD_OUTPUT
 108 # Set the environment variable KBUILD_OUTPUT to point to the directory
 109 # where the output files shall be placed.
 110 # export KBUILD_OUTPUT=dir/to/store/output/files/
 111 # make
 112 #
 113 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 114 # variable.
 115
 116 # KBUILD_SRC is set on invocation of make in OBJ directory
 117 # KBUILD_SRC is not intended to be used by the regular user (for now)
 118 ifeq ($(KBUILD_SRC),)
 119
 120 # OK, Make called in directory where kernel src resides
 121 # Do we want to locate output files in a separate directory?
 122 ifeq ("$(origin O)", "command line")
 123   KBUILD_OUTPUT := $(O)
 124 endif
 125
 126 # That's our default target when none is given on the command line
 127 PHONY := _all
 128 _all:
 129
 130 # Cancel implicit rules on top Makefile
 131 $(CURDIR)/Makefile Makefile: ;
 132
 133 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 134   $(error main directory cannot contain spaces nor colons)
 135 endif
 136
 137 ifneq ($(KBUILD_OUTPUT),)
 138 # Invoke a second make in the output directory, passing relevant variables
 139 # check that the output directory actually exists
 140 saved-output := $(KBUILD_OUTPUT)
 141 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 142                                                                 && /bin/pwd)
 143 $(if $(KBUILD_OUTPUT),, \
 144      $(error failed to create output directory "$(saved-output)"))
 145
 146 PHONY += $(MAKECMDGOALS) sub-make
 147
 148 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 149         @:
 150
 151 sub-make:
 152         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 153         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 154
 155 # Leave processing to above invocation of make
 156 skip-makefile := 1
 157 endif # ifneq ($(KBUILD_OUTPUT),)
 158 endif # ifeq ($(KBUILD_SRC),)
 159
 160 # We process the rest of the Makefile if this is the final invocation of make
 161 ifeq ($(skip-makefile),)
 162
 163 # Do not print "Entering directory ...",
 164 # but we want to display it when entering to the output directory
 165 # so that IDEs/editors are able to understand relative filenames.
 166 MAKEFLAGS += --no-print-directory
 167
 168 # Call a source code checker (by default, "sparse") as part of the
 169 # C compilation.
 170 #
 171 # Use 'make C=1' to enable checking of only re-compiled files.
 172 # Use 'make C=2' to enable checking of *all* source files, regardless
 173 # of whether they are re-compiled or not.
 174 #
 175 # See the file "Documentation/sparse.txt" for more details, including
 176 # where to get the "sparse" utility.
 177
 178 ifeq ("$(origin C)", "command line")
 179   KBUILD_CHECKSRC = $(C)
 180 endif
 181 ifndef KBUILD_CHECKSRC
 182   KBUILD_CHECKSRC = 0
 183 endif
 184
 185 # Use make M=dir to specify directory of external module to build
 186 # Old syntax make ... SUBDIRS=$PWD is still supported
 187 # Setting the environment variable KBUILD_EXTMOD take precedence
 188 ifdef SUBDIRS
 189   KBUILD_EXTMOD ?= $(SUBDIRS)
 190 endif
 191
 192 ifeq ("$(origin M)", "command line")
 193   KBUILD_EXTMOD := $(M)
 194 endif
 195
 196 # If building an external module we do not care about the all: rule
 197 # but instead _all depend on modules
 198 PHONY += all
 199 ifeq ($(KBUILD_EXTMOD),)
 200 _all: all
 201 else
 202 _all: modules
 203 endif
 204
 205 ifeq ($(KBUILD_SRC),)
 206         # building in the source tree
 207         srctree := .
 208 else
 209         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 210                 # building in a subdirectory of the source tree
 211                 srctree := ..
 212         else
 213                 srctree := $(KBUILD_SRC)
 214         endif
 215 endif
 216 objtree         := .
 217 src             := $(srctree)
 218 obj             := $(objtree)
 219
 220 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 221
 222 export srctree objtree VPATH
 223
 224 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 225 # first, and if a usermode build is happening, the "ARCH=um" on the command
 226 # line overrides the setting of ARCH below.  If a native build is happening,
 227 # then ARCH is assigned, getting whatever value it gets normally, and
 228 # SUBARCH is subsequently ignored.
 229
 230 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 231                                   -e s/sun4u/sparc64/ \
 232                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 233                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 234                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 235                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 236
 237 # Cross compiling and selecting different set of gcc/bin-utils
 238 # ---------------------------------------------------------------------------
 239 #
 240 # When performing cross compilation for other architectures ARCH shall be set
 241 # to the target architecture. (See arch/* for the possibilities).
 242 # ARCH can be set during invocation of make:
 243 # make ARCH=ia64
 244 # Another way is to have ARCH set in the environment.
 245 # The default ARCH is the host where make is executed.
 246
 247 # CROSS_COMPILE specify the prefix used for all executables used
 248 # during compilation. Only gcc and related bin-utils executables
 249 # are prefixed with $(CROSS_COMPILE).
 250 # CROSS_COMPILE can be set on the command line
 251 # make CROSS_COMPILE=ia64-linux-
 252 # Alternatively CROSS_COMPILE can be set in the environment.
 253 # A third alternative is to store a setting in .config so that plain
 254 # "make" in the configured kernel build directory always uses that.
 255 # Default value for CROSS_COMPILE is not to prefix executables
 256 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 257 ARCH            ?= $(SUBARCH)
 258 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 259
 260 # Architecture as present in compile.h
 261 UTS_MACHINE     := $(ARCH)
 262 SRCARCH         := $(ARCH)
 263
 264 # Additional ARCH settings for x86
 265 ifeq ($(ARCH),i386)
 266         SRCARCH := x86
 267 endif
 268 ifeq ($(ARCH),x86_64)
 269         SRCARCH := x86
 270 endif
 271
 272 # Additional ARCH settings for sparc
 273 ifeq ($(ARCH),sparc32)
 274        SRCARCH := sparc
 275 endif
 276 ifeq ($(ARCH),sparc64)
 277        SRCARCH := sparc
 278 endif
 279
 280 # Additional ARCH settings for sh
 281 ifeq ($(ARCH),sh64)
 282        SRCARCH := sh
 283 endif
 284
 285 # Additional ARCH settings for tile
 286 ifeq ($(ARCH),tilepro)
 287        SRCARCH := tile
 288 endif
 289 ifeq ($(ARCH),tilegx)
 290        SRCARCH := tile
 291 endif
 292
 293 # Where to locate arch specific headers
 294 hdr-arch  := $(SRCARCH)
 295
 296 KCONFIG_CONFIG  ?= .config
 297 export KCONFIG_CONFIG
 298
 299 # SHELL used by kbuild
 300 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 301           else if [ -x /bin/bash ]; then echo /bin/bash; \
 302           else echo sh; fi ; fi)
 303
 304 HOSTCC       = gcc
 305 HOSTCXX      = g++
 306 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 307 HOSTCXXFLAGS = -O2
 308
 309 # Decide whether to build built-in, modular, or both.
 310 # Normally, just do built-in.
 311
 312 KBUILD_MODULES :=
 313 KBUILD_BUILTIN := 1
 314
 315 # If we have only "make modules", don't compile built-in objects.
 316 ifeq ($(MAKECMDGOALS),modules)
 317   KBUILD_BUILTIN :=
 318 endif
 319
 320 # If we have "make <whatever> modules", compile modules
 321 # in addition to whatever we do anyway.
 322 # Just "make" or "make all" shall build modules as well
 323
 324 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 325   KBUILD_MODULES := 1
 326 endif
 327
 328 ifeq ($(MAKECMDGOALS),)
 329   KBUILD_MODULES := 1
 330 endif
 331
 332 export KBUILD_MODULES KBUILD_BUILTIN
 333 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 334
 335 # We need some generic definitions (do not try to remake the file).
 336 scripts/Kbuild.include: ;
 337 include scripts/Kbuild.include
 338
 339 # Make variables (CC, etc...)
 340 AS              = $(CROSS_COMPILE)as
 341 LD              = $(CROSS_COMPILE)ld
 342 CC              = $(CROSS_COMPILE)gcc
 343 CPP             = $(CC) -E
 344 AR              = $(CROSS_COMPILE)ar
 345 NM              = $(CROSS_COMPILE)nm
 346 STRIP           = $(CROSS_COMPILE)strip
 347 OBJCOPY         = $(CROSS_COMPILE)objcopy
 348 OBJDUMP         = $(CROSS_COMPILE)objdump
 349 AWK             = awk
 350 GENKSYMS        = scripts/genksyms/genksyms
 351 INSTALLKERNEL  := installkernel
 352 DEPMOD          = depmod
 353 PERL            = perl
 354 PYTHON          = python
 355 CHECK           = sparse
 356
 357 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 358                   -Wbitwise -Wno-return-void $(CF)
 359 NOSTDINC_FLAGS  =
 360 CFLAGS_MODULE   =
 361 AFLAGS_MODULE   =
 362 LDFLAGS_MODULE  =
 363 CFLAGS_KERNEL   =
 364 AFLAGS_KERNEL   =
 365 LDFLAGS_vmlinux =
 366
 367 # Use USERINCLUDE when you must reference the UAPI directories only.
 368 USERINCLUDE    := \
 369                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 370                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 371                 -I$(srctree)/include/uapi \
 372                 -I$(objtree)/include/generated/uapi \
 373                 -include $(srctree)/include/linux/kconfig.h
 374
 375 # Use LINUXINCLUDE when you must reference the include/ directory.
 376 # Needed to be compatible with the O= option
 377 LINUXINCLUDE    := \
 378                 -I$(srctree)/arch/$(hdr-arch)/include \
 379                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 380                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 381                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 382                 -I$(objtree)/include
 383
 384 LINUXINCLUDE    += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
 385
 386 KBUILD_AFLAGS   := -D__ASSEMBLY__
 387 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 388                    -fno-strict-aliasing -fno-common -fshort-wchar \
 389                    -Werror-implicit-function-declaration \
 390                    -Wno-format-security \
 391                    -std=gnu89
 392 KBUILD_CPPFLAGS := -D__KERNEL__
 393 KBUILD_AFLAGS_KERNEL :=
 394 KBUILD_CFLAGS_KERNEL :=
 395 KBUILD_AFLAGS_MODULE  := -DMODULE
 396 KBUILD_CFLAGS_MODULE  := -DMODULE
 397 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 398 GCC_PLUGINS_CFLAGS :=
 399 CLANG_FLAGS :=
 400
 401 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 402 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 403 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 404
 405 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 406 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 407 export CPP AR NM STRIP OBJCOPY OBJDUMP
 408 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 409 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 410
 411 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 412 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 413 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 414 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 415 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 416 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 417 export KBUILD_ARFLAGS
 418
 419 # When compiling out-of-tree modules, put MODVERDIR in the module
 420 # tree rather than in the kernel tree. The kernel tree might
 421 # even be read-only.
 422 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 423
 424 # Files to ignore in find ... statements
 425
 426 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 427                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 428                           -prune -o
 429 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 430                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 431
 432 # ===========================================================================
 433 # Rules shared between *config targets and build targets
 434
 435 # Basic helpers built in scripts/
 436 PHONY += scripts_basic
 437 scripts_basic:
 438         $(Q)$(MAKE) $(build)=scripts/basic
 439         $(Q)rm -f .tmp_quiet_recordmcount
 440
 441 # To avoid any implicit rule to kick in, define an empty command.
 442 scripts/basic/%: scripts_basic ;
 443
 444 PHONY += outputmakefile
 445 # outputmakefile generates a Makefile in the output directory, if using a
 446 # separate output directory. This allows convenient use of make in the
 447 # output directory.
 448 outputmakefile:
 449 ifneq ($(KBUILD_SRC),)
 450         $(Q)ln -fsn $(srctree) source
 451         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 452             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 453 endif
 454
 455 # Support for using generic headers in asm-generic
 456 PHONY += asm-generic
 457 asm-generic:
 458         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 459                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 460         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 461                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 462
 463 # To make sure we do not include .config for any of the *config targets
 464 # catch them early, and hand them over to scripts/kconfig/Makefile
 465 # It is allowed to specify more targets when calling make, including
 466 # mixing *config targets and build targets.
 467 # For example 'make oldconfig all'.
 468 # Detect when mixed targets is specified, and make a second invocation
 469 # of make so .config is not included in this case either (for *config).
 470
 471 version_h := include/generated/uapi/linux/version.h
 472 old_version_h := include/linux/version.h
 473
 474 no-dot-config-targets := clean mrproper distclean \
 475                          cscope gtags TAGS tags help% %docs check% coccicheck \
 476                          $(version_h) headers_% archheaders archscripts \
 477                          kernelversion %src-pkg
 478
 479 config-targets := 0
 480 mixed-targets  := 0
 481 dot-config     := 1
 482
 483 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 484         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 485                 dot-config := 0
 486         endif
 487 endif
 488
 489 ifeq ($(KBUILD_EXTMOD),)
 490         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 491                 config-targets := 1
 492                 ifneq ($(words $(MAKECMDGOALS)),1)
 493                         mixed-targets := 1
 494                 endif
 495         endif
 496 endif
 497 # install and module_install need also be processed one by one
 498 ifneq ($(filter install,$(MAKECMDGOALS)),)
 499         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 500                 mixed-targets := 1
 501         endif
 502 endif
 503
 504 ifeq ($(cc-name),clang)
 505 ifneq ($(CROSS_COMPILE),)
 506 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 507 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 508 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
 509 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 510 endif
 511 ifneq ($(GCC_TOOLCHAIN),)
 512 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 513 endif
 514 CLANG_FLAGS     += -no-integrated-as
 515 CLANG_FLAGS     += -Werror=unknown-warning-option
 516 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 517 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 518 endif
 519
 520
 521 ifeq ($(mixed-targets),1)
 522 # ===========================================================================
 523 # We're called with mixed targets (*config and build targets).
 524 # Handle them one by one.
 525
 526 PHONY += $(MAKECMDGOALS) __build_one_by_one
 527
 528 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 529         @:
 530
 531 __build_one_by_one:
 532         $(Q)set -e; \
 533         for i in $(MAKECMDGOALS); do \
 534                 $(MAKE) -f $(srctree)/Makefile $$i; \
 535         done
 536
 537 else
 538 ifeq ($(config-targets),1)
 539 # ===========================================================================
 540 # *config targets only - make sure prerequisites are updated, and descend
 541 # in scripts/kconfig to make the *config target
 542
 543 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 544 # KBUILD_DEFCONFIG may point out an alternative default configuration
 545 # used for 'make defconfig'
 546 include arch/$(SRCARCH)/Makefile
 547 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 548
 549 config: scripts_basic outputmakefile FORCE
 550         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 551
 552 %config: scripts_basic outputmakefile FORCE
 553         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 554
 555 else
 556 # ===========================================================================
 557 # Build targets only - this includes vmlinux, arch specific targets, clean
 558 # targets and others. In general all targets except *config targets.
 559
 560 ifeq ($(KBUILD_EXTMOD),)
 561 # Additional helpers built in scripts/
 562 # Carefully list dependencies so we do not try to build scripts twice
 563 # in parallel
 564 PHONY += scripts
 565 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 566          asm-generic gcc-plugins
 567         $(Q)$(MAKE) $(build)=$(@)
 568
 569 # Objects we will link into vmlinux / subdirs we need to visit
 570 init-y          := init/
 571 drivers-y       := drivers/ sound/ firmware/
 572 net-y           := net/
 573 libs-y          := lib/
 574 core-y          := usr/
 575 virt-y          := virt/
 576 endif # KBUILD_EXTMOD
 577
 578 ifeq ($(dot-config),1)
 579 # Read in config
 580 -include include/config/auto.conf
 581
 582 ifeq ($(KBUILD_EXTMOD),)
 583 # Read in dependencies to all Kconfig* files, make sure to run
 584 # oldconfig if changes are detected.
 585 -include include/config/auto.conf.cmd
 586
 587 # To avoid any implicit rule to kick in, define an empty command
 588 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 589
 590 # If .config is newer than include/config/auto.conf, someone tinkered
 591 # with it and forgot to run make oldconfig.
 592 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 593 # we execute the config step to be sure to catch updated Kconfig files
 594 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 595         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 596 else
 597 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 598 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 599 PHONY += include/config/auto.conf
 600
 601 include/config/auto.conf:
 602         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 603         echo >&2;                                                       \
 604         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 605         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 606         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 607         echo >&2 ;                                                      \
 608         /bin/false)
 609
 610 endif # KBUILD_EXTMOD
 611
 612 else
 613 # Dummy target needed, because used as prerequisite
 614 include/config/auto.conf: ;
 615 endif # $(dot-config)
 616
 617 # For the kernel to actually contain only the needed exported symbols,
 618 # we have to build modules as well to determine what those symbols are.
 619 # (this can be evaluated only once include/config/auto.conf has been included)
 620 ifdef CONFIG_TRIM_UNUSED_KSYMS
 621   KBUILD_MODULES := 1
 622 endif
 623
 624 # The all: target is the default when no target is given on the
 625 # command line.
 626 # This allow a user to issue only 'make' to build a kernel including modules
 627 # Defaults to vmlinux, but the arch makefile usually adds further targets
 628 all: vmlinux
 629
 630 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 631 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 632 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 633 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 634 export CFLAGS_GCOV CFLAGS_KCOV
 635
 636 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 637 # values of the respective KBUILD_* variables
 638 ARCH_CPPFLAGS :=
 639 ARCH_AFLAGS :=
 640 ARCH_CFLAGS :=
 641 include arch/$(SRCARCH)/Makefile
 642
 643 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 644 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 645 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 646 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 647 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 648 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 649 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 650
 651 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 652 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 653 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 654 endif
 655
 656 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 657 KBUILD_CFLAGS   += -Os
 658 else
 659 KBUILD_CFLAGS   += -O2
 660 endif
 661
 662 # Tell gcc to never replace conditional load with a non-conditional one
 663 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 664 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 665
 666 # check for 'asm goto'
 667 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 668         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 669         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 670 endif
 671
 672 include scripts/Makefile.gcc-plugins
 673
 674 ifdef CONFIG_READABLE_ASM
 675 # Disable optimizations that make assembler listings hard to read.
 676 # reorder blocks reorders the control in the function
 677 # ipa clone creates specialized cloned functions
 678 # partial inlining inlines only parts of functions
 679 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 680                  $(call cc-option,-fno-ipa-cp-clone,) \
 681                  $(call cc-option,-fno-partial-inlining)
 682 endif
 683
 684 ifneq ($(CONFIG_FRAME_WARN),0)
 685 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 686 endif
 687
 688 # This selects the stack protector compiler flag. Testing it is delayed
 689 # until after .config has been reprocessed, in the prepare-compiler-check
 690 # target.
 691 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 692   stackp-flag := -fstack-protector
 693   stackp-name := REGULAR
 694 else
 695 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 696   stackp-flag := -fstack-protector-strong
 697   stackp-name := STRONG
 698 else
 699   # Force off for distro compilers that enable stack protector by default.
 700   stackp-flag := $(call cc-option, -fno-stack-protector)
 701 endif
 702 endif
 703 # Find arch-specific stack protector compiler sanity-checking script.
 704 ifdef CONFIG_CC_STACKPROTECTOR
 705   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 706   stackp-check := $(wildcard $(stackp-path))
 707 endif
 708 KBUILD_CFLAGS += $(stackp-flag)
 709
 710 ifeq ($(cc-name),clang)
 711 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 712 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 713 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 714 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 715 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 716 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 717 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 718 # See modpost pattern 2
 719 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 720 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 721 else
 722
 723 # These warnings generated too much noise in a regular build.
 724 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 725 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 726 endif
 727
 728 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 729 ifdef CONFIG_FRAME_POINTER
 730 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 731 else
 732 # Some targets (ARM with Thumb2, for example), can't be built with frame
 733 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 734 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 735 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 736 # -fomit-frame-pointer with FUNCTION_TRACER.
 737 ifndef CONFIG_FUNCTION_TRACER
 738 KBUILD_CFLAGS   += -fomit-frame-pointer
 739 endif
 740 endif
 741
 742 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 743
 744 ifdef CONFIG_DEBUG_INFO
 745 ifdef CONFIG_DEBUG_INFO_SPLIT
 746 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 747 else
 748 KBUILD_CFLAGS   += -g
 749 endif
 750 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 751 endif
 752 ifdef CONFIG_DEBUG_INFO_DWARF4
 753 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 754 endif
 755
 756 ifdef CONFIG_DEBUG_INFO_REDUCED
 757 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 758                    $(call cc-option,-fno-var-tracking)
 759 endif
 760
 761 ifdef CONFIG_FUNCTION_TRACER
 762 ifndef CC_FLAGS_FTRACE
 763 CC_FLAGS_FTRACE := -pg
 764 endif
 765 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 766   # gcc 5 supports generating the mcount tables directly
 767   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 768     CC_FLAGS_FTRACE     += -mrecord-mcount
 769     export CC_USING_RECORD_MCOUNT := 1
 770   endif
 771 endif
 772 export CC_FLAGS_FTRACE
 773 ifdef CONFIG_HAVE_FENTRY
 774 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 775 endif
 776 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 777 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 778 ifdef CONFIG_DYNAMIC_FTRACE
 779         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 780                 BUILD_C_RECORDMCOUNT := y
 781                 export BUILD_C_RECORDMCOUNT
 782         endif
 783 endif
 784 endif
 785
 786 # We trigger additional mismatches with less inlining
 787 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 788 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 789 endif
 790
 791 # arch Makefile may override CC so keep this after arch Makefile is included
 792 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 793 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 794
 795 # warn about C99 declaration after statement
 796 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 797
 798 # disable pointer signed / unsigned warnings in gcc 4.0
 799 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 800
 801 # disable stringop warnings in gcc 8+
 802 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 803
 804 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 805 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 806 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 807 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 808
 809 # Another good warning that we'll want to enable eventually
 810 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 811
 812 # Enabled with W=2, disabled by default as noisy
 813 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 814
 815 # disable invalid "can't wrap" optimizations for signed / pointers
 816 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 817
 818 # clang sets -fmerge-all-constants by default as optimization, but this
 819 # is non-conforming behavior for C and in fact breaks the kernel, so we
 820 # need to disable it here generally.
 821 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 822
 823 # for gcc -fno-merge-all-constants disables everything, but it is fine
 824 # to have actual conforming behavior enabled.
 825 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 826
 827 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 828 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 829
 830 # conserve stack if available
 831 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 832
 833 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 834 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 835
 836 # require functions to have arguments in prototypes, not empty 'int foo()'
 837 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 838
 839 # Prohibit date/time macros, which would make the build non-deterministic
 840 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 841
 842 # enforce correct pointer usage
 843 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 844
 845 # Require designated initializers for all marked structures
 846 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 847
 848 # change __FILE__ to the relative path from the srctree
 849 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 850
 851 # use the deterministic mode of AR if available
 852 KBUILD_ARFLAGS := $(call ar-option,D)
 853
 854 include scripts/Makefile.kasan
 855 include scripts/Makefile.extrawarn
 856 include scripts/Makefile.ubsan
 857
 858 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 859 # last assignments
 860 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 861 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 862 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 863
 864 # Use --build-id when available.
 865 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 866                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 867 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 868 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 869
 870 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 871 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 872 endif
 873
 874 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 875 LDFLAGS_vmlinux += $(call ld-option, -X,)
 876 endif
 877
 878 # Default kernel image to build when no specific target is given.
 879 # KBUILD_IMAGE may be overruled on the command line or
 880 # set in the environment
 881 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 882 # this default value
 883 export KBUILD_IMAGE ?= vmlinux
 884
 885 #
 886 # INSTALL_PATH specifies where to place the updated kernel and system map
 887 # images. Default is /boot, but you can set it to other values
 888 export  INSTALL_PATH ?= /boot
 889
 890 #
 891 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 892 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 893 # an argument if needed. Otherwise it defaults to the kernel install path
 894 #
 895 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 896
 897 #
 898 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 899 # relocations required by build roots.  This is not defined in the
 900 # makefile but the argument can be passed to make if needed.
 901 #
 902
 903 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 904 export MODLIB
 905
 906 #
 907 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 908 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 909 # the default option --strip-debug will be used.  Otherwise,
 910 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 911
 912 ifdef INSTALL_MOD_STRIP
 913 ifeq ($(INSTALL_MOD_STRIP),1)
 914 mod_strip_cmd = $(STRIP) --strip-debug
 915 else
 916 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 917 endif # INSTALL_MOD_STRIP=1
 918 else
 919 mod_strip_cmd = true
 920 endif # INSTALL_MOD_STRIP
 921 export mod_strip_cmd
 922
 923 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 924 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 925 # or CONFIG_MODULE_COMPRESS_XZ.
 926
 927 mod_compress_cmd = true
 928 ifdef CONFIG_MODULE_COMPRESS
 929   ifdef CONFIG_MODULE_COMPRESS_GZIP
 930     mod_compress_cmd = gzip -n -f
 931   endif # CONFIG_MODULE_COMPRESS_GZIP
 932   ifdef CONFIG_MODULE_COMPRESS_XZ
 933     mod_compress_cmd = xz -f
 934   endif # CONFIG_MODULE_COMPRESS_XZ
 935 endif # CONFIG_MODULE_COMPRESS
 936 export mod_compress_cmd
 937
 938 # Select initial ramdisk compression format, default is gzip(1).
 939 # This shall be used by the dracut(8) tool while creating an initramfs image.
 940 #
 941 INITRD_COMPRESS-y                  := gzip
 942 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 943 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 944 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 945 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 946 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 947 # do not export INITRD_COMPRESS, since we didn't actually
 948 # choose a sane default compression above.
 949 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 950
 951 ifdef CONFIG_MODULE_SIG_ALL
 952 $(eval $(call config_filename,MODULE_SIG_KEY))
 953
 954 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 955 else
 956 mod_sign_cmd = true
 957 endif
 958 export mod_sign_cmd
 959
 960
 961 ifeq ($(KBUILD_EXTMOD),)
 962 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 963
 964 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 965                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 966                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 967
 968 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 969                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 970
 971 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 972 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 973 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 974 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 975 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 976 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 977 libs-y          := $(libs-y1) $(libs-y2)
 978 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 979
 980 # Externally visible symbols (used by link-vmlinux.sh)
 981 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 982 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 983 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 984 export LDFLAGS_vmlinux
 985 # used by scripts/pacmage/Makefile
 986 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 987
 988 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 989
 990 # Include targets which we want to execute sequentially if the rest of the
 991 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 992 # evaluated more than once.
 993 PHONY += vmlinux_prereq
 994 vmlinux_prereq: $(vmlinux-deps) FORCE
 995 ifdef CONFIG_HEADERS_CHECK
 996         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 997 endif
 998 ifdef CONFIG_GDB_SCRIPTS
 999         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
1000 endif
1001 ifdef CONFIG_TRIM_UNUSED_KSYMS
1002         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1003           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1004 endif
1005
1006 # standalone target for easier testing
1007 include/generated/autoksyms.h: FORCE
1008         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1009
1010 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1011
1012 # Final link of vmlinux with optional arch pass after final link
1013     cmd_link-vmlinux =                                                 \
1014         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
1015         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1016
1017 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1018         +$(call if_changed,link-vmlinux)
1019
1020 # Build samples along the rest of the kernel
1021 ifdef CONFIG_SAMPLES
1022 vmlinux-dirs += samples
1023 endif
1024
1025 # The actual objects are generated when descending,
1026 # make sure no implicit rule kicks in
1027 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1028
1029 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1030 # Preset locale variables to speed up the build process. Limit locale
1031 # tweaks to this spot to avoid wrong language settings when running
1032 # make menuconfig etc.
1033 # Error messages still appears in the original language
1034
1035 PHONY += $(vmlinux-dirs)
1036 $(vmlinux-dirs): prepare scripts
1037         $(Q)$(MAKE) $(build)=$@
1038
1039 define filechk_kernel.release
1040         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1041 endef
1042
1043 # Store (new) KERNELRELEASE string in include/config/kernel.release
1044 include/config/kernel.release: include/config/auto.conf FORCE
1045         $(call filechk,kernel.release)
1046
1047
1048 # Things we need to do before we recursively start building the kernel
1049 # or the modules are listed in "prepare".
1050 # A multi level approach is used. prepareN is processed before prepareN-1.
1051 # archprepare is used in arch Makefiles and when processed asm symlink,
1052 # version.h and scripts_basic is processed / created.
1053
1054 # Listed in dependency order
1055 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1056
1057 # prepare3 is used to check if we are building in a separate output directory,
1058 # and if so do:
1059 # 1) Check that make has not been executed in the kernel src $(srctree)
1060 prepare3: include/config/kernel.release
1061 ifneq ($(KBUILD_SRC),)
1062         @$(kecho) '  Using $(srctree) as source for kernel'
1063         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1064                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1065                 echo >&2 "  in the '$(srctree)' directory.";\
1066                 /bin/false; \
1067         fi;
1068 endif
1069
1070 # prepare2 creates a makefile if using a separate output directory.
1071 # From this point forward, .config has been reprocessed, so any rules
1072 # that need to depend on updated CONFIG_* values can be checked here.
1073 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1074
1075 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1076                    include/config/auto.conf
1077         $(cmd_crmodverdir)
1078
1079 archprepare: archheaders archscripts prepare1 scripts_basic
1080
1081 prepare0: archprepare gcc-plugins
1082         $(Q)$(MAKE) $(build)=.
1083
1084 # All the preparing..
1085 prepare: prepare0 prepare-objtool
1086
1087 ifdef CONFIG_STACK_VALIDATION
1088   has_libelf := $(call try-run,\
1089                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1090   ifeq ($(has_libelf),1)
1091     objtool_target := tools/objtool FORCE
1092   else
1093     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1094     SKIP_STACK_VALIDATION := 1
1095     export SKIP_STACK_VALIDATION
1096   endif
1097 endif
1098
1099 PHONY += prepare-objtool
1100 prepare-objtool: $(objtool_target)
1101
1102 # Check for CONFIG flags that require compiler support. Abort the build
1103 # after .config has been processed, but before the kernel build starts.
1104 #
1105 # For security-sensitive CONFIG options, we don't want to fallback and/or
1106 # silently change which compiler flags will be used, since that leads to
1107 # producing kernels with different security feature characteristics
1108 # depending on the compiler used. (For example, "But I selected
1109 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1110 PHONY += prepare-compiler-check
1111 prepare-compiler-check: FORCE
1112 # Make sure compiler supports requested stack protector flag.
1113 ifdef stackp-name
1114   ifeq ($(call cc-option, $(stackp-flag)),)
1115         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1116                   $(stackp-flag) not supported by compiler >&2 && exit 1
1117   endif
1118 endif
1119 # Make sure compiler does not have buggy stack-protector support.
1120 ifdef stackp-check
1121   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1122         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1123                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1124   endif
1125 endif
1126         @:
1127
1128 # Generate some files
1129 # ---------------------------------------------------------------------------
1130
1131 # KERNELRELEASE can change from a few different places, meaning version.h
1132 # needs to be updated, so this check is forced on all builds
1133
1134 uts_len := 64
1135 define filechk_utsrelease.h
1136         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1137           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1138           exit 1;                                                         \
1139         fi;                                                               \
1140         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1141 endef
1142
1143 define filechk_version.h
1144         (echo \#define LINUX_VERSION_CODE $(shell                         \
1145         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 255); \
1146         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1147 endef
1148
1149 $(version_h): $(srctree)/Makefile FORCE
1150         $(call filechk,version.h)
1151         $(Q)rm -f $(old_version_h)
1152
1153 include/generated/utsrelease.h: include/config/kernel.release FORCE
1154         $(call filechk,utsrelease.h)
1155
1156 PHONY += headerdep
1157 headerdep:
1158         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1159         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1160
1161 # ---------------------------------------------------------------------------
1162 # Firmware install
1163 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1164 export INSTALL_FW_PATH
1165
1166 PHONY += firmware_install
1167 firmware_install:
1168         @mkdir -p $(objtree)/firmware
1169         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1170
1171 # ---------------------------------------------------------------------------
1172 # Kernel headers
1173
1174 #Default location for installed headers
1175 export INSTALL_HDR_PATH = $(objtree)/usr
1176
1177 # If we do an all arch process set dst to asm-$(hdr-arch)
1178 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1179
1180 PHONY += archheaders
1181 archheaders:
1182
1183 PHONY += archscripts
1184 archscripts:
1185
1186 PHONY += __headers
1187 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1188         $(Q)$(MAKE) $(build)=scripts build_unifdef
1189
1190 PHONY += headers_install_all
1191 headers_install_all:
1192         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1193
1194 PHONY += headers_install
1195 headers_install: __headers
1196         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1197           $(error Headers not exportable for the $(SRCARCH) architecture))
1198         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1199         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1200
1201 PHONY += headers_check_all
1202 headers_check_all: headers_install_all
1203         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1204
1205 PHONY += headers_check
1206 headers_check: headers_install
1207         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1208         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1209
1210 # ---------------------------------------------------------------------------
1211 # Kernel selftest
1212
1213 PHONY += kselftest
1214 kselftest:
1215         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1216
1217 kselftest-clean:
1218         $(Q)$(MAKE) -C tools/testing/selftests clean
1219
1220 PHONY += kselftest-merge
1221 kselftest-merge:
1222         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1223         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1224                 -m $(objtree)/.config \
1225                 $(srctree)/tools/testing/selftests/*/config
1226         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1227
1228 # ---------------------------------------------------------------------------
1229 # Modules
1230
1231 ifdef CONFIG_MODULES
1232
1233 # By default, build modules as well
1234
1235 all: modules
1236
1237 # When we're building modules with modversions, we need to consider
1238 # the built-in objects during the descend as well, in order to
1239 # make sure the checksums are up to date before we record them.
1240 ifdef CONFIG_MODVERSIONS
1241   KBUILD_BUILTIN := 1
1242 endif
1243
1244 # Build modules
1245 #
1246 # A module can be listed more than once in obj-m resulting in
1247 # duplicate lines in modules.order files.  Those are removed
1248 # using awk while concatenating to the final file.
1249
1250 PHONY += modules
1251 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1252         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1253         @$(kecho) '  Building modules, stage 2.';
1254         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1255         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1256
1257 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1258         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1259
1260 %/modules.builtin: include/config/auto.conf
1261         $(Q)$(MAKE) $(modbuiltin)=$*
1262
1263
1264 # Target to prepare building external modules
1265 PHONY += modules_prepare
1266 modules_prepare: prepare scripts
1267
1268 # Target to install modules
1269 PHONY += modules_install
1270 modules_install: _modinst_ _modinst_post
1271
1272 PHONY += _modinst_
1273 _modinst_:
1274         @rm -rf $(MODLIB)/kernel
1275         @rm -f $(MODLIB)/source
1276         @mkdir -p $(MODLIB)/kernel
1277         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1278         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1279                 rm -f $(MODLIB)/build ; \
1280                 ln -s $(CURDIR) $(MODLIB)/build ; \
1281         fi
1282         @cp -f $(objtree)/modules.order $(MODLIB)/
1283         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1284         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1285
1286 # This depmod is only for convenience to give the initial
1287 # boot a modules.dep even before / is mounted read-write.  However the
1288 # boot script depmod is the master version.
1289 PHONY += _modinst_post
1290 _modinst_post: _modinst_
1291         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1292         $(call cmd,depmod)
1293
1294 ifeq ($(CONFIG_MODULE_SIG), y)
1295 PHONY += modules_sign
1296 modules_sign:
1297         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1298 endif
1299
1300 else # CONFIG_MODULES
1301
1302 # Modules not configured
1303 # ---------------------------------------------------------------------------
1304
1305 PHONY += modules modules_install
1306 modules modules_install:
1307         @echo >&2
1308         @echo >&2 "The present kernel configuration has modules disabled."
1309         @echo >&2 "Type 'make config' and enable loadable module support."
1310         @echo >&2 "Then build a kernel with module support enabled."
1311         @echo >&2
1312         @exit 1
1313
1314 endif # CONFIG_MODULES
1315
1316 ###
1317 # Cleaning is done on three levels.
1318 # make clean     Delete most generated files
1319 #                Leave enough to build external modules
1320 # make mrproper  Delete the current configuration, and all generated files
1321 # make distclean Remove editor backup files, patch leftover files and the like
1322
1323 # Directories & files removed with 'make clean'
1324 CLEAN_DIRS  += $(MODVERDIR)
1325
1326 # Directories & files removed with 'make mrproper'
1327 MRPROPER_DIRS  += include/config usr/include include/generated          \
1328                   arch/*/include/generated .tmp_objdiff
1329 MRPROPER_FILES += .config .config.old .version .old_version \
1330                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1331                   signing_key.pem signing_key.priv signing_key.x509     \
1332                   x509.genkey extra_certificates signing_key.x509.keyid \
1333                   signing_key.x509.signer vmlinux-gdb.py
1334
1335 # clean - Delete most, but leave enough to build external modules
1336 #
1337 clean: rm-dirs  := $(CLEAN_DIRS)
1338 clean: rm-files := $(CLEAN_FILES)
1339 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1340
1341 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1342 $(clean-dirs):
1343         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1344
1345 vmlinuxclean:
1346         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1347         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1348
1349 clean: archclean vmlinuxclean
1350
1351 # mrproper - Delete all generated files, including .config
1352 #
1353 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1354 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1355 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1356
1357 PHONY += $(mrproper-dirs) mrproper archmrproper
1358 $(mrproper-dirs):
1359         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1360
1361 mrproper: clean archmrproper $(mrproper-dirs)
1362         $(call cmd,rmdirs)
1363         $(call cmd,rmfiles)
1364
1365 # distclean
1366 #
1367 PHONY += distclean
1368
1369 distclean: mrproper
1370         @find $(srctree) $(RCS_FIND_IGNORE) \
1371                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1372                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1373                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1374                 -type f -print | xargs rm -f
1375
1376
1377 # Packaging of the kernel to various formats
1378 # ---------------------------------------------------------------------------
1379 # rpm target kept for backward compatibility
1380 package-dir     := scripts/package
1381
1382 %src-pkg: FORCE
1383         $(Q)$(MAKE) $(build)=$(package-dir) $@
1384 %pkg: include/config/kernel.release FORCE
1385         $(Q)$(MAKE) $(build)=$(package-dir) $@
1386 rpm: include/config/kernel.release FORCE
1387         $(Q)$(MAKE) $(build)=$(package-dir) $@
1388
1389
1390 # Brief documentation of the typical targets used
1391 # ---------------------------------------------------------------------------
1392
1393 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1394 boards := $(sort $(notdir $(boards)))
1395 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1396 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1397
1398 PHONY += help
1399 help:
1400         @echo  'Cleaning targets:'
1401         @echo  '  clean           - Remove most generated files but keep the config and'
1402         @echo  '                    enough build support to build external modules'
1403         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1404         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1405         @echo  ''
1406         @echo  'Configuration targets:'
1407         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1408         @echo  ''
1409         @echo  'Other generic targets:'
1410         @echo  '  all             - Build all targets marked with [*]'
1411         @echo  '* vmlinux         - Build the bare kernel'
1412         @echo  '* modules         - Build all modules'
1413         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1414         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1415         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1416         @echo  '  dir/            - Build all files in dir and below'
1417         @echo  '  dir/file.[ois]  - Build specified target only'
1418         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1419         @echo  '                    (requires compiler support for LLVM assembly generation)'
1420         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1421         @echo  '                    (requires a recent binutils and recent build (System.map))'
1422         @echo  '  dir/file.ko     - Build module including final link'
1423         @echo  '  modules_prepare - Set up for building external modules'
1424         @echo  '  tags/TAGS       - Generate tags file for editors'
1425         @echo  '  cscope          - Generate cscope index'
1426         @echo  '  gtags           - Generate GNU GLOBAL index'
1427         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1428         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1429         @echo  '  image_name      - Output the image name (use with make -s)'
1430         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1431          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1432          echo  ''
1433         @echo  'Static analysers'
1434         @echo  '  checkstack      - Generate a list of stack hogs'
1435         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1436         @echo  '  versioncheck    - Sanity check on version.h usage'
1437         @echo  '  includecheck    - Check for duplicate included header files'
1438         @echo  '  export_report   - List the usages of all exported symbols'
1439         @echo  '  headers_check   - Sanity check on exported headers'
1440         @echo  '  headerdep       - Detect inclusion cycles in headers'
1441         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1442         @echo  ''
1443         @echo  'Kernel selftest'
1444         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1445         @echo  '                    Build, install, and boot kernel before'
1446         @echo  '                    running kselftest on it'
1447         @echo  '  kselftest-clean - Remove all generated kselftest files'
1448         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1449         @echo  '                    .config.'
1450         @echo  ''
1451         @echo  'Kernel packaging:'
1452         @$(MAKE) $(build)=$(package-dir) help
1453         @echo  ''
1454         @echo  'Documentation targets:'
1455         @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1456         @echo  ''
1457         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1458         @echo  ''
1459         @echo  'Architecture specific targets ($(SRCARCH)):'
1460         @$(if $(archhelp),$(archhelp),\
1461                 echo '  No architecture specific help defined for $(SRCARCH)')
1462         @echo  ''
1463         @$(if $(boards), \
1464                 $(foreach b, $(boards), \
1465                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1466                 echo '')
1467         @$(if $(board-dirs), \
1468                 $(foreach b, $(board-dirs), \
1469                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1470                 printf "  %-16s - Show all of the above\\n" help-boards; \
1471                 echo '')
1472
1473         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1474         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1475         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1476         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1477         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1478         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1479         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1480         @echo  '                1: warnings which may be relevant and do not occur too often'
1481         @echo  '                2: warnings which occur quite often but may still be relevant'
1482         @echo  '                3: more obscure warnings, can most likely be ignored'
1483         @echo  '                Multiple levels can be combined with W=12 or W=123'
1484         @echo  ''
1485         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1486         @echo  'For further info see the ./README file'
1487
1488
1489 help-board-dirs := $(addprefix help-,$(board-dirs))
1490
1491 help-boards: $(help-board-dirs)
1492
1493 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1494
1495 $(help-board-dirs): help-%:
1496         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1497         @$(if $(boards-per-dir), \
1498                 $(foreach b, $(boards-per-dir), \
1499                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1500                 echo '')
1501
1502
1503 # Documentation targets
1504 # ---------------------------------------------------------------------------
1505 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1506 PHONY += $(DOC_TARGETS)
1507 $(DOC_TARGETS): scripts_basic FORCE
1508         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1509         $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1510         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1511
1512 else # KBUILD_EXTMOD
1513
1514 ###
1515 # External module support.
1516 # When building external modules the kernel used as basis is considered
1517 # read-only, and no consistency checks are made and the make
1518 # system is not used on the basis kernel. If updates are required
1519 # in the basis kernel ordinary make commands (without M=...) must
1520 # be used.
1521 #
1522 # The following are the only valid targets when building external
1523 # modules.
1524 # make M=dir clean     Delete all automatically generated files
1525 # make M=dir modules   Make all modules in specified dir
1526 # make M=dir           Same as 'make M=dir modules'
1527 # make M=dir modules_install
1528 #                      Install the modules built in the module directory
1529 #                      Assumes install directory is already created
1530
1531 # We are always building modules
1532 KBUILD_MODULES := 1
1533
1534 PHONY += $(objtree)/Module.symvers
1535 $(objtree)/Module.symvers:
1536         @test -e $(objtree)/Module.symvers || ( \
1537         echo; \
1538         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1539         echo "           is missing; modules will have no dependencies and modversions."; \
1540         echo )
1541
1542 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1543 PHONY += $(module-dirs) modules
1544 $(module-dirs): prepare $(objtree)/Module.symvers
1545         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1546
1547 modules: $(module-dirs)
1548         @$(kecho) '  Building modules, stage 2.';
1549         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1550
1551 PHONY += modules_install
1552 modules_install: _emodinst_ _emodinst_post
1553
1554 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1555 PHONY += _emodinst_
1556 _emodinst_:
1557         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1558         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1559
1560 PHONY += _emodinst_post
1561 _emodinst_post: _emodinst_
1562         $(call cmd,depmod)
1563
1564 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1565
1566 PHONY += $(clean-dirs) clean
1567 $(clean-dirs):
1568         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1569
1570 clean:  rm-dirs := $(MODVERDIR)
1571 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1572
1573 PHONY += help
1574 help:
1575         @echo  '  Building external modules.'
1576         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1577         @echo  ''
1578         @echo  '  modules         - default target, build the module(s)'
1579         @echo  '  modules_install - install the module'
1580         @echo  '  clean           - remove generated files in module directory only'
1581         @echo  ''
1582
1583 # Dummies...
1584 PHONY += prepare scripts
1585 prepare:
1586         $(cmd_crmodverdir)
1587 scripts: ;
1588 endif # KBUILD_EXTMOD
1589
1590 clean: $(clean-dirs)
1591         $(call cmd,rmdirs)
1592         $(call cmd,rmfiles)
1593         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1594                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1595                 -o -name '*.ko.*' \
1596                 -o -name '*.dwo'  \
1597                 -o -name '*.su'  \
1598                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1599                 -o -name '*.symtypes' -o -name 'modules.order' \
1600                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1601                 -o -name '*.c.[012]*.*' \
1602                 -o -name '*.ll' \
1603                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1604
1605 # Generate tags for editors
1606 # ---------------------------------------------------------------------------
1607 quiet_cmd_tags = GEN     $@
1608       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1609
1610 tags TAGS cscope gtags: FORCE
1611         $(call cmd,tags)
1612
1613 # Scripts to check various things for consistency
1614 # ---------------------------------------------------------------------------
1615
1616 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1617
1618 includecheck:
1619         find $(srctree)/* $(RCS_FIND_IGNORE) \
1620                 -name '*.[hcS]' -type f -print | sort \
1621                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1622
1623 versioncheck:
1624         find $(srctree)/* $(RCS_FIND_IGNORE) \
1625                 -name '*.[hcS]' -type f -print | sort \
1626                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1627
1628 coccicheck:
1629         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1630
1631 namespacecheck:
1632         $(PERL) $(srctree)/scripts/namespace.pl
1633
1634 export_report:
1635         $(PERL) $(srctree)/scripts/export_report.pl
1636
1637 endif #ifeq ($(config-targets),1)
1638 endif #ifeq ($(mixed-targets),1)
1639
1640 PHONY += checkstack kernelrelease kernelversion image_name
1641
1642 # UML needs a little special treatment here.  It wants to use the host
1643 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1644 # else wants $(ARCH), including people doing cross-builds, which means
1645 # that $(SUBARCH) doesn't work here.
1646 ifeq ($(ARCH), um)
1647 CHECKSTACK_ARCH := $(SUBARCH)
1648 else
1649 CHECKSTACK_ARCH := $(ARCH)
1650 endif
1651 checkstack:
1652         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1653         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1654
1655 kernelrelease:
1656         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1657
1658 kernelversion:
1659         @echo $(KERNELVERSION)
1660
1661 image_name:
1662         @echo $(KBUILD_IMAGE)
1663
1664 # Clear a bunch of variables before executing the submake
1665 tools/: FORCE
1666         $(Q)mkdir -p $(objtree)/tools
1667         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1668
1669 tools/%: FORCE
1670         $(Q)mkdir -p $(objtree)/tools
1671         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1672
1673 # Single targets
1674 # ---------------------------------------------------------------------------
1675 # Single targets are compatible with:
1676 # - build with mixed source and output
1677 # - build with separate output dir 'make O=...'
1678 # - external modules
1679 #
1680 #  target-dir => where to store outputfile
1681 #  build-dir  => directory in kernel source tree to use
1682
1683 ifeq ($(KBUILD_EXTMOD),)
1684         build-dir  = $(patsubst %/,%,$(dir $@))
1685         target-dir = $(dir $@)
1686 else
1687         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1688         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1689         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1690 endif
1691
1692 %.s: %.c prepare scripts FORCE
1693         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1694 %.i: %.c prepare scripts FORCE
1695         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1696 %.o: %.c prepare scripts FORCE
1697         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1698 %.lst: %.c prepare scripts FORCE
1699         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1700 %.s: %.S prepare scripts FORCE
1701         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1702 %.o: %.S prepare scripts FORCE
1703         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1704 %.symtypes: %.c prepare scripts FORCE
1705         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1706 %.ll: %.c prepare scripts FORCE
1707         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1708
1709 # Modules
1710 /: prepare scripts FORCE
1711         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1712         $(build)=$(build-dir)
1713 # Make sure the latest headers are built for Documentation
1714 Documentation/ samples/: headers_install
1715 %/: prepare scripts FORCE
1716         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1717         $(build)=$(build-dir)
1718 %.ko: prepare scripts FORCE
1719         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1720         $(build)=$(build-dir) $(@:.ko=.o)
1721         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1722
1723 # FIXME Should go into a make.lib or something
1724 # ===========================================================================
1725
1726 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1727       cmd_rmdirs = rm -rf $(rm-dirs)
1728
1729 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1730       cmd_rmfiles = rm -f $(rm-files)
1731
1732 # Run depmod only if we have System.map and depmod is executable
1733 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1734       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1735                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1736
1737 # Create temporary dir for module support files
1738 # clean it up only when building all modules
1739 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1740                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1741
1742 # read all saved command lines
1743
1744 targets := $(wildcard $(sort $(targets)))
1745 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1746
1747 ifneq ($(cmd_files),)
1748   $(cmd_files): ;       # Do not try to update included dependency files
1749   include $(cmd_files)
1750 endif
1751
1752 endif   # skip-makefile
1753
1754 PHONY += FORCE
1755 FORCE:
1756
1757 # Declare the contents of the .PHONY variable as phony.  We keep that
1758 # information in a variable so we can use it in if_changed and friends.
1759 .PHONY: $(PHONY)