Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 9
   3 SUBLEVEL = 213
   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 # When we're building modules with modversions, we need to consider
 317 # the built-in objects during the descend as well, in order to
 318 # make sure the checksums are up to date before we record them.
 319
 320 ifeq ($(MAKECMDGOALS),modules)
 321   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 322 endif
 323
 324 # If we have "make <whatever> modules", compile modules
 325 # in addition to whatever we do anyway.
 326 # Just "make" or "make all" shall build modules as well
 327
 328 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 329   KBUILD_MODULES := 1
 330 endif
 331
 332 ifeq ($(MAKECMDGOALS),)
 333   KBUILD_MODULES := 1
 334 endif
 335
 336 export KBUILD_MODULES KBUILD_BUILTIN
 337 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 338
 339 # We need some generic definitions (do not try to remake the file).
 340 scripts/Kbuild.include: ;
 341 include scripts/Kbuild.include
 342
 343 # Make variables (CC, etc...)
 344 AS              = $(CROSS_COMPILE)as
 345 LD              = $(CROSS_COMPILE)ld
 346 CC              = $(CROSS_COMPILE)gcc
 347 CPP             = $(CC) -E
 348 AR              = $(CROSS_COMPILE)ar
 349 NM              = $(CROSS_COMPILE)nm
 350 STRIP           = $(CROSS_COMPILE)strip
 351 OBJCOPY         = $(CROSS_COMPILE)objcopy
 352 OBJDUMP         = $(CROSS_COMPILE)objdump
 353 AWK             = awk
 354 GENKSYMS        = scripts/genksyms/genksyms
 355 INSTALLKERNEL  := installkernel
 356 DEPMOD          = /sbin/depmod
 357 PERL            = perl
 358 PYTHON          = python
 359 CHECK           = sparse
 360
 361 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 362                   -Wbitwise -Wno-return-void $(CF)
 363 NOSTDINC_FLAGS  =
 364 CFLAGS_MODULE   =
 365 AFLAGS_MODULE   =
 366 LDFLAGS_MODULE  =
 367 CFLAGS_KERNEL   =
 368 AFLAGS_KERNEL   =
 369 LDFLAGS_vmlinux =
 370
 371 # Use USERINCLUDE when you must reference the UAPI directories only.
 372 USERINCLUDE    := \
 373                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 374                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 375                 -I$(srctree)/include/uapi \
 376                 -I$(objtree)/include/generated/uapi \
 377                 -include $(srctree)/include/linux/kconfig.h
 378
 379 # Use LINUXINCLUDE when you must reference the include/ directory.
 380 # Needed to be compatible with the O= option
 381 LINUXINCLUDE    := \
 382                 -I$(srctree)/arch/$(hdr-arch)/include \
 383                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 384                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 385                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 386                 -I$(objtree)/include
 387
 388 LINUXINCLUDE    += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
 389
 390 KBUILD_AFLAGS   := -D__ASSEMBLY__
 391 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 392                    -fno-strict-aliasing -fno-common -fshort-wchar \
 393                    -Werror-implicit-function-declaration \
 394                    -Wno-format-security \
 395                    -std=gnu89
 396 KBUILD_CPPFLAGS := -D__KERNEL__
 397 KBUILD_AFLAGS_KERNEL :=
 398 KBUILD_CFLAGS_KERNEL :=
 399 KBUILD_AFLAGS_MODULE  := -DMODULE
 400 KBUILD_CFLAGS_MODULE  := -DMODULE
 401 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 402 GCC_PLUGINS_CFLAGS :=
 403 CLANG_FLAGS :=
 404
 405 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 406 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 407 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 408
 409 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 410 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 411 export CPP AR NM STRIP OBJCOPY OBJDUMP
 412 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 413 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 414
 415 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 416 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 417 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 418 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 419 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 420 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 421 export KBUILD_ARFLAGS
 422
 423 # When compiling out-of-tree modules, put MODVERDIR in the module
 424 # tree rather than in the kernel tree. The kernel tree might
 425 # even be read-only.
 426 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 427
 428 # Files to ignore in find ... statements
 429
 430 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 431                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 432                           -prune -o
 433 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 434                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 435
 436 # ===========================================================================
 437 # Rules shared between *config targets and build targets
 438
 439 # Basic helpers built in scripts/
 440 PHONY += scripts_basic
 441 scripts_basic:
 442         $(Q)$(MAKE) $(build)=scripts/basic
 443         $(Q)rm -f .tmp_quiet_recordmcount
 444
 445 # To avoid any implicit rule to kick in, define an empty command.
 446 scripts/basic/%: scripts_basic ;
 447
 448 PHONY += outputmakefile
 449 # outputmakefile generates a Makefile in the output directory, if using a
 450 # separate output directory. This allows convenient use of make in the
 451 # output directory.
 452 outputmakefile:
 453 ifneq ($(KBUILD_SRC),)
 454         $(Q)ln -fsn $(srctree) source
 455         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 456             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 457 endif
 458
 459 # Support for using generic headers in asm-generic
 460 PHONY += asm-generic
 461 asm-generic:
 462         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 463                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 464         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 465                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 466
 467 # To make sure we do not include .config for any of the *config targets
 468 # catch them early, and hand them over to scripts/kconfig/Makefile
 469 # It is allowed to specify more targets when calling make, including
 470 # mixing *config targets and build targets.
 471 # For example 'make oldconfig all'.
 472 # Detect when mixed targets is specified, and make a second invocation
 473 # of make so .config is not included in this case either (for *config).
 474
 475 version_h := include/generated/uapi/linux/version.h
 476 old_version_h := include/linux/version.h
 477
 478 no-dot-config-targets := clean mrproper distclean \
 479                          cscope gtags TAGS tags help% %docs check% coccicheck \
 480                          $(version_h) headers_% archheaders archscripts \
 481                          kernelversion %src-pkg
 482
 483 config-targets := 0
 484 mixed-targets  := 0
 485 dot-config     := 1
 486
 487 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 488         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 489                 dot-config := 0
 490         endif
 491 endif
 492
 493 ifeq ($(KBUILD_EXTMOD),)
 494         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 495                 config-targets := 1
 496                 ifneq ($(words $(MAKECMDGOALS)),1)
 497                         mixed-targets := 1
 498                 endif
 499         endif
 500 endif
 501 # install and module_install need also be processed one by one
 502 ifneq ($(filter install,$(MAKECMDGOALS)),)
 503         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 504                 mixed-targets := 1
 505         endif
 506 endif
 507
 508 ifeq ($(cc-name),clang)
 509 ifneq ($(CROSS_COMPILE),)
 510 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 511 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 512 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 513 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 514 endif
 515 ifneq ($(GCC_TOOLCHAIN),)
 516 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 517 endif
 518 CLANG_FLAGS     += -no-integrated-as
 519 CLANG_FLAGS     += -Werror=unknown-warning-option
 520 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 521 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 522 endif
 523
 524
 525 ifeq ($(mixed-targets),1)
 526 # ===========================================================================
 527 # We're called with mixed targets (*config and build targets).
 528 # Handle them one by one.
 529
 530 PHONY += $(MAKECMDGOALS) __build_one_by_one
 531
 532 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 533         @:
 534
 535 __build_one_by_one:
 536         $(Q)set -e; \
 537         for i in $(MAKECMDGOALS); do \
 538                 $(MAKE) -f $(srctree)/Makefile $$i; \
 539         done
 540
 541 else
 542 ifeq ($(config-targets),1)
 543 # ===========================================================================
 544 # *config targets only - make sure prerequisites are updated, and descend
 545 # in scripts/kconfig to make the *config target
 546
 547 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 548 # KBUILD_DEFCONFIG may point out an alternative default configuration
 549 # used for 'make defconfig'
 550 include arch/$(SRCARCH)/Makefile
 551 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 552
 553 config: scripts_basic outputmakefile FORCE
 554         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 555
 556 %config: scripts_basic outputmakefile FORCE
 557         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 558
 559 else
 560 # ===========================================================================
 561 # Build targets only - this includes vmlinux, arch specific targets, clean
 562 # targets and others. In general all targets except *config targets.
 563
 564 ifeq ($(KBUILD_EXTMOD),)
 565 # Additional helpers built in scripts/
 566 # Carefully list dependencies so we do not try to build scripts twice
 567 # in parallel
 568 PHONY += scripts
 569 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 570          asm-generic gcc-plugins
 571         $(Q)$(MAKE) $(build)=$(@)
 572
 573 # Objects we will link into vmlinux / subdirs we need to visit
 574 init-y          := init/
 575 drivers-y       := drivers/ sound/ firmware/
 576 net-y           := net/
 577 libs-y          := lib/
 578 core-y          := usr/
 579 virt-y          := virt/
 580 endif # KBUILD_EXTMOD
 581
 582 ifeq ($(dot-config),1)
 583 # Read in config
 584 -include include/config/auto.conf
 585
 586 ifeq ($(KBUILD_EXTMOD),)
 587 # Read in dependencies to all Kconfig* files, make sure to run
 588 # oldconfig if changes are detected.
 589 -include include/config/auto.conf.cmd
 590
 591 # To avoid any implicit rule to kick in, define an empty command
 592 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 593
 594 # If .config is newer than include/config/auto.conf, someone tinkered
 595 # with it and forgot to run make oldconfig.
 596 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 597 # we execute the config step to be sure to catch updated Kconfig files
 598 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 599         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 600 else
 601 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 602 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 603 PHONY += include/config/auto.conf
 604
 605 include/config/auto.conf:
 606         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 607         echo >&2;                                                       \
 608         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 609         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 610         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 611         echo >&2 ;                                                      \
 612         /bin/false)
 613
 614 endif # KBUILD_EXTMOD
 615
 616 else
 617 # Dummy target needed, because used as prerequisite
 618 include/config/auto.conf: ;
 619 endif # $(dot-config)
 620
 621 # For the kernel to actually contain only the needed exported symbols,
 622 # we have to build modules as well to determine what those symbols are.
 623 # (this can be evaluated only once include/config/auto.conf has been included)
 624 ifdef CONFIG_TRIM_UNUSED_KSYMS
 625   KBUILD_MODULES := 1
 626 endif
 627
 628 # The all: target is the default when no target is given on the
 629 # command line.
 630 # This allow a user to issue only 'make' to build a kernel including modules
 631 # Defaults to vmlinux, but the arch makefile usually adds further targets
 632 all: vmlinux
 633
 634 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 635 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 636 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 637 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 638 export CFLAGS_GCOV CFLAGS_KCOV
 639
 640 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 641 # values of the respective KBUILD_* variables
 642 ARCH_CPPFLAGS :=
 643 ARCH_AFLAGS :=
 644 ARCH_CFLAGS :=
 645 include arch/$(SRCARCH)/Makefile
 646
 647 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 648 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 649 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 650 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 651 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 652 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 653 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 654
 655 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 656 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 657 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 658 endif
 659
 660 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 661 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 662 else
 663 ifdef CONFIG_PROFILE_ALL_BRANCHES
 664 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 665 else
 666 KBUILD_CFLAGS   += -O2
 667 endif
 668 endif
 669
 670 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 671                         $(call cc-disable-warning,maybe-uninitialized,))
 672
 673 # Tell gcc to never replace conditional load with a non-conditional one
 674 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 675
 676 # check for 'asm goto'
 677 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 678         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 679         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 680 endif
 681
 682 include scripts/Makefile.gcc-plugins
 683
 684 ifdef CONFIG_READABLE_ASM
 685 # Disable optimizations that make assembler listings hard to read.
 686 # reorder blocks reorders the control in the function
 687 # ipa clone creates specialized cloned functions
 688 # partial inlining inlines only parts of functions
 689 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 690                  $(call cc-option,-fno-ipa-cp-clone,) \
 691                  $(call cc-option,-fno-partial-inlining)
 692 endif
 693
 694 ifneq ($(CONFIG_FRAME_WARN),0)
 695 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 696 endif
 697
 698 # This selects the stack protector compiler flag. Testing it is delayed
 699 # until after .config has been reprocessed, in the prepare-compiler-check
 700 # target.
 701 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 702   stackp-flag := -fstack-protector
 703   stackp-name := REGULAR
 704 else
 705 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 706   stackp-flag := -fstack-protector-strong
 707   stackp-name := STRONG
 708 else
 709   # Force off for distro compilers that enable stack protector by default.
 710   stackp-flag := $(call cc-option, -fno-stack-protector)
 711 endif
 712 endif
 713 # Find arch-specific stack protector compiler sanity-checking script.
 714 ifdef CONFIG_CC_STACKPROTECTOR
 715   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 716   stackp-check := $(wildcard $(stackp-path))
 717 endif
 718 KBUILD_CFLAGS += $(stackp-flag)
 719
 720 ifeq ($(cc-name),clang)
 721 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 722 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 723 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 724 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 725 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 726 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 727 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 728 # See modpost pattern 2
 729 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 730 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 731 else
 732
 733 # These warnings generated too much noise in a regular build.
 734 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 735 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 736 endif
 737
 738 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 739 ifdef CONFIG_FRAME_POINTER
 740 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 741 else
 742 # Some targets (ARM with Thumb2, for example), can't be built with frame
 743 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 744 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 745 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 746 # -fomit-frame-pointer with FUNCTION_TRACER.
 747 ifndef CONFIG_FUNCTION_TRACER
 748 KBUILD_CFLAGS   += -fomit-frame-pointer
 749 endif
 750 endif
 751
 752 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 753
 754 ifdef CONFIG_DEBUG_INFO
 755 ifdef CONFIG_DEBUG_INFO_SPLIT
 756 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 757 else
 758 KBUILD_CFLAGS   += -g
 759 endif
 760 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 761 endif
 762 ifdef CONFIG_DEBUG_INFO_DWARF4
 763 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 764 endif
 765
 766 ifdef CONFIG_DEBUG_INFO_REDUCED
 767 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 768                    $(call cc-option,-fno-var-tracking)
 769 endif
 770
 771 ifdef CONFIG_FUNCTION_TRACER
 772 ifndef CC_FLAGS_FTRACE
 773 CC_FLAGS_FTRACE := -pg
 774 endif
 775 export CC_FLAGS_FTRACE
 776 ifdef CONFIG_HAVE_FENTRY
 777 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 778 endif
 779 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 780 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 781 ifdef CONFIG_DYNAMIC_FTRACE
 782         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 783                 BUILD_C_RECORDMCOUNT := y
 784                 export BUILD_C_RECORDMCOUNT
 785         endif
 786 endif
 787 endif
 788
 789 # We trigger additional mismatches with less inlining
 790 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 791 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 792 endif
 793
 794 # arch Makefile may override CC so keep this after arch Makefile is included
 795 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 796 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 797
 798 # warn about C99 declaration after statement
 799 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 800
 801 # disable pointer signed / unsigned warnings in gcc 4.0
 802 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 803
 804 # disable stringop warnings in gcc 8+
 805 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 806
 807 # disable invalid "can't wrap" optimizations for signed / pointers
 808 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 809
 810 # clang sets -fmerge-all-constants by default as optimization, but this
 811 # is non-conforming behavior for C and in fact breaks the kernel, so we
 812 # need to disable it here generally.
 813 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 814
 815 # for gcc -fno-merge-all-constants disables everything, but it is fine
 816 # to have actual conforming behavior enabled.
 817 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 818
 819 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 820 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 821
 822 # conserve stack if available
 823 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 824
 825 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 826 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 827
 828 # require functions to have arguments in prototypes, not empty 'int foo()'
 829 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 830
 831 # Prohibit date/time macros, which would make the build non-deterministic
 832 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 833
 834 # enforce correct pointer usage
 835 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 836
 837 # Require designated initializers for all marked structures
 838 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 839
 840 # change __FILE__ to the relative path from the srctree
 841 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 842
 843 # ensure -fcf-protection is disabled when using retpoline as it is
 844 # incompatible with -mindirect-branch=thunk-extern
 845 ifdef CONFIG_RETPOLINE
 846 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 847 endif
 848
 849 # use the deterministic mode of AR if available
 850 KBUILD_ARFLAGS := $(call ar-option,D)
 851
 852 include scripts/Makefile.kasan
 853 include scripts/Makefile.extrawarn
 854 include scripts/Makefile.ubsan
 855
 856 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 857 # last assignments
 858 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 859 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 860 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 861
 862 # Use --build-id when available.
 863 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 864                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 865 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 866 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 867
 868 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 869 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 870 endif
 871
 872 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 873 LDFLAGS_vmlinux += $(call ld-option, -X,)
 874 endif
 875
 876 # Default kernel image to build when no specific target is given.
 877 # KBUILD_IMAGE may be overruled on the command line or
 878 # set in the environment
 879 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 880 # this default value
 881 export KBUILD_IMAGE ?= vmlinux
 882
 883 #
 884 # INSTALL_PATH specifies where to place the updated kernel and system map
 885 # images. Default is /boot, but you can set it to other values
 886 export  INSTALL_PATH ?= /boot
 887
 888 #
 889 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 890 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 891 # an argument if needed. Otherwise it defaults to the kernel install path
 892 #
 893 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 894
 895 #
 896 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 897 # relocations required by build roots.  This is not defined in the
 898 # makefile but the argument can be passed to make if needed.
 899 #
 900
 901 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 902 export MODLIB
 903
 904 #
 905 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 906 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 907 # the default option --strip-debug will be used.  Otherwise,
 908 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 909
 910 ifdef INSTALL_MOD_STRIP
 911 ifeq ($(INSTALL_MOD_STRIP),1)
 912 mod_strip_cmd = $(STRIP) --strip-debug
 913 else
 914 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 915 endif # INSTALL_MOD_STRIP=1
 916 else
 917 mod_strip_cmd = true
 918 endif # INSTALL_MOD_STRIP
 919 export mod_strip_cmd
 920
 921 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 922 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 923 # or CONFIG_MODULE_COMPRESS_XZ.
 924
 925 mod_compress_cmd = true
 926 ifdef CONFIG_MODULE_COMPRESS
 927   ifdef CONFIG_MODULE_COMPRESS_GZIP
 928     mod_compress_cmd = gzip -n -f
 929   endif # CONFIG_MODULE_COMPRESS_GZIP
 930   ifdef CONFIG_MODULE_COMPRESS_XZ
 931     mod_compress_cmd = xz -f
 932   endif # CONFIG_MODULE_COMPRESS_XZ
 933 endif # CONFIG_MODULE_COMPRESS
 934 export mod_compress_cmd
 935
 936 # Select initial ramdisk compression format, default is gzip(1).
 937 # This shall be used by the dracut(8) tool while creating an initramfs image.
 938 #
 939 INITRD_COMPRESS-y                  := gzip
 940 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 941 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 942 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 943 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 944 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 945 # do not export INITRD_COMPRESS, since we didn't actually
 946 # choose a sane default compression above.
 947 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 948
 949 ifdef CONFIG_MODULE_SIG_ALL
 950 $(eval $(call config_filename,MODULE_SIG_KEY))
 951
 952 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 953 else
 954 mod_sign_cmd = true
 955 endif
 956 export mod_sign_cmd
 957
 958
 959 ifeq ($(KBUILD_EXTMOD),)
 960 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 961
 962 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 963                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 964                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 965
 966 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 967                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 968
 969 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 970 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 971 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 972 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 973 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 974 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 975 libs-y          := $(libs-y1) $(libs-y2)
 976 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 977
 978 # Externally visible symbols (used by link-vmlinux.sh)
 979 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 980 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 981 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 982 export LDFLAGS_vmlinux
 983 # used by scripts/pacmage/Makefile
 984 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 985
 986 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 987
 988 # Include targets which we want to execute sequentially if the rest of the
 989 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 990 # evaluated more than once.
 991 PHONY += vmlinux_prereq
 992 vmlinux_prereq: $(vmlinux-deps) FORCE
 993 ifdef CONFIG_HEADERS_CHECK
 994         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 995 endif
 996 ifdef CONFIG_GDB_SCRIPTS
 997         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 998 endif
 999 ifdef CONFIG_TRIM_UNUSED_KSYMS
1000         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1001           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1002 endif
1003
1004 # standalone target for easier testing
1005 include/generated/autoksyms.h: FORCE
1006         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1007
1008 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1009
1010 # Final link of vmlinux with optional arch pass after final link
1011     cmd_link-vmlinux =                                                 \
1012         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
1013         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1014
1015 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1016         +$(call if_changed,link-vmlinux)
1017
1018 # Build samples along the rest of the kernel
1019 ifdef CONFIG_SAMPLES
1020 vmlinux-dirs += samples
1021 endif
1022
1023 # The actual objects are generated when descending,
1024 # make sure no implicit rule kicks in
1025 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1026
1027 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1028 # Preset locale variables to speed up the build process. Limit locale
1029 # tweaks to this spot to avoid wrong language settings when running
1030 # make menuconfig etc.
1031 # Error messages still appears in the original language
1032
1033 PHONY += $(vmlinux-dirs)
1034 $(vmlinux-dirs): prepare scripts
1035         $(Q)$(MAKE) $(build)=$@
1036
1037 define filechk_kernel.release
1038         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1039 endef
1040
1041 # Store (new) KERNELRELEASE string in include/config/kernel.release
1042 include/config/kernel.release: include/config/auto.conf FORCE
1043         $(call filechk,kernel.release)
1044
1045
1046 # Things we need to do before we recursively start building the kernel
1047 # or the modules are listed in "prepare".
1048 # A multi level approach is used. prepareN is processed before prepareN-1.
1049 # archprepare is used in arch Makefiles and when processed asm symlink,
1050 # version.h and scripts_basic is processed / created.
1051
1052 # Listed in dependency order
1053 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1054
1055 # prepare3 is used to check if we are building in a separate output directory,
1056 # and if so do:
1057 # 1) Check that make has not been executed in the kernel src $(srctree)
1058 prepare3: include/config/kernel.release
1059 ifneq ($(KBUILD_SRC),)
1060         @$(kecho) '  Using $(srctree) as source for kernel'
1061         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1062                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1063                 echo >&2 "  in the '$(srctree)' directory.";\
1064                 /bin/false; \
1065         fi;
1066 endif
1067
1068 # prepare2 creates a makefile if using a separate output directory.
1069 # From this point forward, .config has been reprocessed, so any rules
1070 # that need to depend on updated CONFIG_* values can be checked here.
1071 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1072
1073 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1074                    include/config/auto.conf
1075         $(cmd_crmodverdir)
1076
1077 archprepare: archheaders archscripts prepare1 scripts_basic
1078
1079 prepare0: archprepare gcc-plugins
1080         $(Q)$(MAKE) $(build)=.
1081
1082 # All the preparing..
1083 prepare: prepare0 prepare-objtool
1084
1085 ifdef CONFIG_STACK_VALIDATION
1086   has_libelf := $(call try-run,\
1087                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1088   ifeq ($(has_libelf),1)
1089     objtool_target := tools/objtool FORCE
1090   else
1091     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1092     SKIP_STACK_VALIDATION := 1
1093     export SKIP_STACK_VALIDATION
1094   endif
1095 endif
1096
1097 PHONY += prepare-objtool
1098 prepare-objtool: $(objtool_target)
1099
1100 # Check for CONFIG flags that require compiler support. Abort the build
1101 # after .config has been processed, but before the kernel build starts.
1102 #
1103 # For security-sensitive CONFIG options, we don't want to fallback and/or
1104 # silently change which compiler flags will be used, since that leads to
1105 # producing kernels with different security feature characteristics
1106 # depending on the compiler used. (For example, "But I selected
1107 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1108 PHONY += prepare-compiler-check
1109 prepare-compiler-check: FORCE
1110 # Make sure compiler supports requested stack protector flag.
1111 ifdef stackp-name
1112   ifeq ($(call cc-option, $(stackp-flag)),)
1113         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1114                   $(stackp-flag) not supported by compiler >&2 && exit 1
1115   endif
1116 endif
1117 # Make sure compiler does not have buggy stack-protector support.
1118 ifdef stackp-check
1119   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1120         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1121                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1122   endif
1123 endif
1124         @:
1125
1126 # Generate some files
1127 # ---------------------------------------------------------------------------
1128
1129 # KERNELRELEASE can change from a few different places, meaning version.h
1130 # needs to be updated, so this check is forced on all builds
1131
1132 uts_len := 64
1133 define filechk_utsrelease.h
1134         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1135           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1136           exit 1;                                                         \
1137         fi;                                                               \
1138         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1139 endef
1140
1141 define filechk_version.h
1142         (echo \#define LINUX_VERSION_CODE $(shell                         \
1143         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1144         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1145 endef
1146
1147 $(version_h): $(srctree)/Makefile FORCE
1148         $(call filechk,version.h)
1149         $(Q)rm -f $(old_version_h)
1150
1151 include/generated/utsrelease.h: include/config/kernel.release FORCE
1152         $(call filechk,utsrelease.h)
1153
1154 PHONY += headerdep
1155 headerdep:
1156         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1157         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1158
1159 # ---------------------------------------------------------------------------
1160 # Firmware install
1161 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1162 export INSTALL_FW_PATH
1163
1164 PHONY += firmware_install
1165 firmware_install:
1166         @mkdir -p $(objtree)/firmware
1167         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1168
1169 # ---------------------------------------------------------------------------
1170 # Kernel headers
1171
1172 #Default location for installed headers
1173 export INSTALL_HDR_PATH = $(objtree)/usr
1174
1175 # If we do an all arch process set dst to asm-$(hdr-arch)
1176 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1177
1178 PHONY += archheaders
1179 archheaders:
1180
1181 PHONY += archscripts
1182 archscripts:
1183
1184 PHONY += __headers
1185 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1186         $(Q)$(MAKE) $(build)=scripts build_unifdef
1187
1188 PHONY += headers_install_all
1189 headers_install_all:
1190         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1191
1192 PHONY += headers_install
1193 headers_install: __headers
1194         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1195           $(error Headers not exportable for the $(SRCARCH) architecture))
1196         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1197         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1198
1199 PHONY += headers_check_all
1200 headers_check_all: headers_install_all
1201         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1202
1203 PHONY += headers_check
1204 headers_check: headers_install
1205         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1206         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1207
1208 # ---------------------------------------------------------------------------
1209 # Kernel selftest
1210
1211 PHONY += kselftest
1212 kselftest:
1213         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1214
1215 kselftest-clean:
1216         $(Q)$(MAKE) -C tools/testing/selftests clean
1217
1218 PHONY += kselftest-merge
1219 kselftest-merge:
1220         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1221         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1222                 -m $(objtree)/.config \
1223                 $(srctree)/tools/testing/selftests/*/config
1224         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1225
1226 # ---------------------------------------------------------------------------
1227 # Modules
1228
1229 ifdef CONFIG_MODULES
1230
1231 # By default, build modules as well
1232
1233 all: modules
1234
1235 # Build modules
1236 #
1237 # A module can be listed more than once in obj-m resulting in
1238 # duplicate lines in modules.order files.  Those are removed
1239 # using awk while concatenating to the final file.
1240
1241 PHONY += modules
1242 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1243         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1244         @$(kecho) '  Building modules, stage 2.';
1245         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1246         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1247
1248 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1249         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1250
1251 %/modules.builtin: include/config/auto.conf
1252         $(Q)$(MAKE) $(modbuiltin)=$*
1253
1254
1255 # Target to prepare building external modules
1256 PHONY += modules_prepare
1257 modules_prepare: prepare scripts
1258
1259 # Target to install modules
1260 PHONY += modules_install
1261 modules_install: _modinst_ _modinst_post
1262
1263 PHONY += _modinst_
1264 _modinst_:
1265         @rm -rf $(MODLIB)/kernel
1266         @rm -f $(MODLIB)/source
1267         @mkdir -p $(MODLIB)/kernel
1268         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1269         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1270                 rm -f $(MODLIB)/build ; \
1271                 ln -s $(CURDIR) $(MODLIB)/build ; \
1272         fi
1273         @cp -f $(objtree)/modules.order $(MODLIB)/
1274         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1275         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1276
1277 # This depmod is only for convenience to give the initial
1278 # boot a modules.dep even before / is mounted read-write.  However the
1279 # boot script depmod is the master version.
1280 PHONY += _modinst_post
1281 _modinst_post: _modinst_
1282         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1283         $(call cmd,depmod)
1284
1285 ifeq ($(CONFIG_MODULE_SIG), y)
1286 PHONY += modules_sign
1287 modules_sign:
1288         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1289 endif
1290
1291 else # CONFIG_MODULES
1292
1293 # Modules not configured
1294 # ---------------------------------------------------------------------------
1295
1296 PHONY += modules modules_install
1297 modules modules_install:
1298         @echo >&2
1299         @echo >&2 "The present kernel configuration has modules disabled."
1300         @echo >&2 "Type 'make config' and enable loadable module support."
1301         @echo >&2 "Then build a kernel with module support enabled."
1302         @echo >&2
1303         @exit 1
1304
1305 endif # CONFIG_MODULES
1306
1307 ###
1308 # Cleaning is done on three levels.
1309 # make clean     Delete most generated files
1310 #                Leave enough to build external modules
1311 # make mrproper  Delete the current configuration, and all generated files
1312 # make distclean Remove editor backup files, patch leftover files and the like
1313
1314 # Directories & files removed with 'make clean'
1315 CLEAN_DIRS  += $(MODVERDIR)
1316
1317 # Directories & files removed with 'make mrproper'
1318 MRPROPER_DIRS  += include/config usr/include include/generated          \
1319                   arch/*/include/generated .tmp_objdiff
1320 MRPROPER_FILES += .config .config.old .version .old_version \
1321                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1322                   signing_key.pem signing_key.priv signing_key.x509     \
1323                   x509.genkey extra_certificates signing_key.x509.keyid \
1324                   signing_key.x509.signer vmlinux-gdb.py
1325
1326 # clean - Delete most, but leave enough to build external modules
1327 #
1328 clean: rm-dirs  := $(CLEAN_DIRS)
1329 clean: rm-files := $(CLEAN_FILES)
1330 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1331
1332 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1333 $(clean-dirs):
1334         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1335
1336 vmlinuxclean:
1337         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1338         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1339
1340 clean: archclean vmlinuxclean
1341
1342 # mrproper - Delete all generated files, including .config
1343 #
1344 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1345 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1346 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1347
1348 PHONY += $(mrproper-dirs) mrproper archmrproper
1349 $(mrproper-dirs):
1350         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1351
1352 mrproper: clean archmrproper $(mrproper-dirs)
1353         $(call cmd,rmdirs)
1354         $(call cmd,rmfiles)
1355
1356 # distclean
1357 #
1358 PHONY += distclean
1359
1360 distclean: mrproper
1361         @find $(srctree) $(RCS_FIND_IGNORE) \
1362                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1363                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1364                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1365                 -type f -print | xargs rm -f
1366
1367
1368 # Packaging of the kernel to various formats
1369 # ---------------------------------------------------------------------------
1370 # rpm target kept for backward compatibility
1371 package-dir     := scripts/package
1372
1373 %src-pkg: FORCE
1374         $(Q)$(MAKE) $(build)=$(package-dir) $@
1375 %pkg: include/config/kernel.release FORCE
1376         $(Q)$(MAKE) $(build)=$(package-dir) $@
1377 rpm: include/config/kernel.release FORCE
1378         $(Q)$(MAKE) $(build)=$(package-dir) $@
1379
1380
1381 # Brief documentation of the typical targets used
1382 # ---------------------------------------------------------------------------
1383
1384 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1385 boards := $(sort $(notdir $(boards)))
1386 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1387 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1388
1389 PHONY += help
1390 help:
1391         @echo  'Cleaning targets:'
1392         @echo  '  clean           - Remove most generated files but keep the config and'
1393         @echo  '                    enough build support to build external modules'
1394         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1395         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1396         @echo  ''
1397         @echo  'Configuration targets:'
1398         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1399         @echo  ''
1400         @echo  'Other generic targets:'
1401         @echo  '  all             - Build all targets marked with [*]'
1402         @echo  '* vmlinux         - Build the bare kernel'
1403         @echo  '* modules         - Build all modules'
1404         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1405         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1406         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1407         @echo  '  dir/            - Build all files in dir and below'
1408         @echo  '  dir/file.[ois]  - Build specified target only'
1409         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1410         @echo  '                    (requires compiler support for LLVM assembly generation)'
1411         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1412         @echo  '                    (requires a recent binutils and recent build (System.map))'
1413         @echo  '  dir/file.ko     - Build module including final link'
1414         @echo  '  modules_prepare - Set up for building external modules'
1415         @echo  '  tags/TAGS       - Generate tags file for editors'
1416         @echo  '  cscope          - Generate cscope index'
1417         @echo  '  gtags           - Generate GNU GLOBAL index'
1418         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1419         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1420         @echo  '  image_name      - Output the image name (use with make -s)'
1421         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1422          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1423          echo  ''
1424         @echo  'Static analysers'
1425         @echo  '  checkstack      - Generate a list of stack hogs'
1426         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1427         @echo  '  versioncheck    - Sanity check on version.h usage'
1428         @echo  '  includecheck    - Check for duplicate included header files'
1429         @echo  '  export_report   - List the usages of all exported symbols'
1430         @echo  '  headers_check   - Sanity check on exported headers'
1431         @echo  '  headerdep       - Detect inclusion cycles in headers'
1432         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1433         @echo  ''
1434         @echo  'Kernel selftest'
1435         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1436         @echo  '                    Build, install, and boot kernel before'
1437         @echo  '                    running kselftest on it'
1438         @echo  '  kselftest-clean - Remove all generated kselftest files'
1439         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1440         @echo  '                    .config.'
1441         @echo  ''
1442         @echo  'Kernel packaging:'
1443         @$(MAKE) $(build)=$(package-dir) help
1444         @echo  ''
1445         @echo  'Documentation targets:'
1446         @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1447         @echo  ''
1448         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1449         @echo  ''
1450         @echo  'Architecture specific targets ($(SRCARCH)):'
1451         @$(if $(archhelp),$(archhelp),\
1452                 echo '  No architecture specific help defined for $(SRCARCH)')
1453         @echo  ''
1454         @$(if $(boards), \
1455                 $(foreach b, $(boards), \
1456                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1457                 echo '')
1458         @$(if $(board-dirs), \
1459                 $(foreach b, $(board-dirs), \
1460                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1461                 printf "  %-16s - Show all of the above\\n" help-boards; \
1462                 echo '')
1463
1464         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1465         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1466         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1467         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1468         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1469         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1470         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1471         @echo  '                1: warnings which may be relevant and do not occur too often'
1472         @echo  '                2: warnings which occur quite often but may still be relevant'
1473         @echo  '                3: more obscure warnings, can most likely be ignored'
1474         @echo  '                Multiple levels can be combined with W=12 or W=123'
1475         @echo  ''
1476         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1477         @echo  'For further info see the ./README file'
1478
1479
1480 help-board-dirs := $(addprefix help-,$(board-dirs))
1481
1482 help-boards: $(help-board-dirs)
1483
1484 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1485
1486 $(help-board-dirs): help-%:
1487         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1488         @$(if $(boards-per-dir), \
1489                 $(foreach b, $(boards-per-dir), \
1490                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1491                 echo '')
1492
1493
1494 # Documentation targets
1495 # ---------------------------------------------------------------------------
1496 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1497 PHONY += $(DOC_TARGETS)
1498 $(DOC_TARGETS): scripts_basic FORCE
1499         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1500         $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1501         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1502
1503 else # KBUILD_EXTMOD
1504
1505 ###
1506 # External module support.
1507 # When building external modules the kernel used as basis is considered
1508 # read-only, and no consistency checks are made and the make
1509 # system is not used on the basis kernel. If updates are required
1510 # in the basis kernel ordinary make commands (without M=...) must
1511 # be used.
1512 #
1513 # The following are the only valid targets when building external
1514 # modules.
1515 # make M=dir clean     Delete all automatically generated files
1516 # make M=dir modules   Make all modules in specified dir
1517 # make M=dir           Same as 'make M=dir modules'
1518 # make M=dir modules_install
1519 #                      Install the modules built in the module directory
1520 #                      Assumes install directory is already created
1521
1522 # We are always building modules
1523 KBUILD_MODULES := 1
1524
1525 PHONY += $(objtree)/Module.symvers
1526 $(objtree)/Module.symvers:
1527         @test -e $(objtree)/Module.symvers || ( \
1528         echo; \
1529         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1530         echo "           is missing; modules will have no dependencies and modversions."; \
1531         echo )
1532
1533 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1534 PHONY += $(module-dirs) modules
1535 $(module-dirs): prepare $(objtree)/Module.symvers
1536         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1537
1538 modules: $(module-dirs)
1539         @$(kecho) '  Building modules, stage 2.';
1540         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1541
1542 PHONY += modules_install
1543 modules_install: _emodinst_ _emodinst_post
1544
1545 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1546 PHONY += _emodinst_
1547 _emodinst_:
1548         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1549         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1550
1551 PHONY += _emodinst_post
1552 _emodinst_post: _emodinst_
1553         $(call cmd,depmod)
1554
1555 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1556
1557 PHONY += $(clean-dirs) clean
1558 $(clean-dirs):
1559         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1560
1561 clean:  rm-dirs := $(MODVERDIR)
1562 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1563
1564 PHONY += help
1565 help:
1566         @echo  '  Building external modules.'
1567         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1568         @echo  ''
1569         @echo  '  modules         - default target, build the module(s)'
1570         @echo  '  modules_install - install the module'
1571         @echo  '  clean           - remove generated files in module directory only'
1572         @echo  ''
1573
1574 # Dummies...
1575 PHONY += prepare scripts
1576 prepare:
1577         $(cmd_crmodverdir)
1578 scripts: ;
1579 endif # KBUILD_EXTMOD
1580
1581 clean: $(clean-dirs)
1582         $(call cmd,rmdirs)
1583         $(call cmd,rmfiles)
1584         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1585                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1586                 -o -name '*.ko.*' \
1587                 -o -name '*.dwo'  \
1588                 -o -name '*.su'  \
1589                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1590                 -o -name '*.symtypes' -o -name 'modules.order' \
1591                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1592                 -o -name '*.c.[012]*.*' \
1593                 -o -name '*.ll' \
1594                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1595
1596 # Generate tags for editors
1597 # ---------------------------------------------------------------------------
1598 quiet_cmd_tags = GEN     $@
1599       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1600
1601 tags TAGS cscope gtags: FORCE
1602         $(call cmd,tags)
1603
1604 # Scripts to check various things for consistency
1605 # ---------------------------------------------------------------------------
1606
1607 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1608
1609 includecheck:
1610         find $(srctree)/* $(RCS_FIND_IGNORE) \
1611                 -name '*.[hcS]' -type f -print | sort \
1612                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1613
1614 versioncheck:
1615         find $(srctree)/* $(RCS_FIND_IGNORE) \
1616                 -name '*.[hcS]' -type f -print | sort \
1617                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1618
1619 coccicheck:
1620         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1621
1622 namespacecheck:
1623         $(PERL) $(srctree)/scripts/namespace.pl
1624
1625 export_report:
1626         $(PERL) $(srctree)/scripts/export_report.pl
1627
1628 endif #ifeq ($(config-targets),1)
1629 endif #ifeq ($(mixed-targets),1)
1630
1631 PHONY += checkstack kernelrelease kernelversion image_name
1632
1633 # UML needs a little special treatment here.  It wants to use the host
1634 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1635 # else wants $(ARCH), including people doing cross-builds, which means
1636 # that $(SUBARCH) doesn't work here.
1637 ifeq ($(ARCH), um)
1638 CHECKSTACK_ARCH := $(SUBARCH)
1639 else
1640 CHECKSTACK_ARCH := $(ARCH)
1641 endif
1642 checkstack:
1643         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1644         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1645
1646 kernelrelease:
1647         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1648
1649 kernelversion:
1650         @echo $(KERNELVERSION)
1651
1652 image_name:
1653         @echo $(KBUILD_IMAGE)
1654
1655 # Clear a bunch of variables before executing the submake
1656 tools/: FORCE
1657         $(Q)mkdir -p $(objtree)/tools
1658         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1659
1660 tools/%: FORCE
1661         $(Q)mkdir -p $(objtree)/tools
1662         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1663
1664 # Single targets
1665 # ---------------------------------------------------------------------------
1666 # Single targets are compatible with:
1667 # - build with mixed source and output
1668 # - build with separate output dir 'make O=...'
1669 # - external modules
1670 #
1671 #  target-dir => where to store outputfile
1672 #  build-dir  => directory in kernel source tree to use
1673
1674 ifeq ($(KBUILD_EXTMOD),)
1675         build-dir  = $(patsubst %/,%,$(dir $@))
1676         target-dir = $(dir $@)
1677 else
1678         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1679         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1680         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1681 endif
1682
1683 %.s: %.c prepare scripts FORCE
1684         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1685 %.i: %.c prepare scripts FORCE
1686         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1687 %.o: %.c prepare scripts FORCE
1688         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1689 %.lst: %.c prepare scripts FORCE
1690         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1691 %.s: %.S prepare scripts FORCE
1692         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1693 %.o: %.S prepare scripts FORCE
1694         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1695 %.symtypes: %.c prepare scripts FORCE
1696         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1697 %.ll: %.c prepare scripts FORCE
1698         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1699
1700 # Modules
1701 /: prepare scripts FORCE
1702         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1703         $(build)=$(build-dir)
1704 # Make sure the latest headers are built for Documentation
1705 Documentation/ samples/: headers_install
1706 %/: prepare scripts FORCE
1707         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1708         $(build)=$(build-dir)
1709 %.ko: prepare scripts FORCE
1710         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1711         $(build)=$(build-dir) $(@:.ko=.o)
1712         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1713
1714 # FIXME Should go into a make.lib or something
1715 # ===========================================================================
1716
1717 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1718       cmd_rmdirs = rm -rf $(rm-dirs)
1719
1720 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1721       cmd_rmfiles = rm -f $(rm-files)
1722
1723 # Run depmod only if we have System.map and depmod is executable
1724 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1725       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1726                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1727
1728 # Create temporary dir for module support files
1729 # clean it up only when building all modules
1730 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1731                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1732
1733 # read all saved command lines
1734
1735 targets := $(wildcard $(sort $(targets)))
1736 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1737
1738 ifneq ($(cmd_files),)
1739   $(cmd_files): ;       # Do not try to update included dependency files
1740   include $(cmd_files)
1741 endif
1742
1743 endif   # skip-makefile
1744
1745 PHONY += FORCE
1746 FORCE:
1747
1748 # Declare the contents of the .PHONY variable as phony.  We keep that
1749 # information in a variable so we can use it in if_changed and friends.
1750 .PHONY: $(PHONY)