Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 9
   3 SUBLEVEL = 168
   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
 404 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 405 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 406 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 407
 408 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 409 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 410 export CPP AR NM STRIP OBJCOPY OBJDUMP
 411 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 412 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 413
 414 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 415 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 416 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 417 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 418 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 419 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 420 export KBUILD_ARFLAGS
 421
 422 # When compiling out-of-tree modules, put MODVERDIR in the module
 423 # tree rather than in the kernel tree. The kernel tree might
 424 # even be read-only.
 425 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 426
 427 # Files to ignore in find ... statements
 428
 429 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 430                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 431                           -prune -o
 432 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 433                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 434
 435 # ===========================================================================
 436 # Rules shared between *config targets and build targets
 437
 438 # Basic helpers built in scripts/
 439 PHONY += scripts_basic
 440 scripts_basic:
 441         $(Q)$(MAKE) $(build)=scripts/basic
 442         $(Q)rm -f .tmp_quiet_recordmcount
 443
 444 # To avoid any implicit rule to kick in, define an empty command.
 445 scripts/basic/%: scripts_basic ;
 446
 447 PHONY += outputmakefile
 448 # outputmakefile generates a Makefile in the output directory, if using a
 449 # separate output directory. This allows convenient use of make in the
 450 # output directory.
 451 outputmakefile:
 452 ifneq ($(KBUILD_SRC),)
 453         $(Q)ln -fsn $(srctree) source
 454         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 455             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 456 endif
 457
 458 # Support for using generic headers in asm-generic
 459 PHONY += asm-generic
 460 asm-generic:
 461         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 462                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 463         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 464                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 465
 466 # To make sure we do not include .config for any of the *config targets
 467 # catch them early, and hand them over to scripts/kconfig/Makefile
 468 # It is allowed to specify more targets when calling make, including
 469 # mixing *config targets and build targets.
 470 # For example 'make oldconfig all'.
 471 # Detect when mixed targets is specified, and make a second invocation
 472 # of make so .config is not included in this case either (for *config).
 473
 474 version_h := include/generated/uapi/linux/version.h
 475 old_version_h := include/linux/version.h
 476
 477 no-dot-config-targets := clean mrproper distclean \
 478                          cscope gtags TAGS tags help% %docs check% coccicheck \
 479                          $(version_h) headers_% archheaders archscripts \
 480                          kernelversion %src-pkg
 481
 482 config-targets := 0
 483 mixed-targets  := 0
 484 dot-config     := 1
 485
 486 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 487         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 488                 dot-config := 0
 489         endif
 490 endif
 491
 492 ifeq ($(KBUILD_EXTMOD),)
 493         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 494                 config-targets := 1
 495                 ifneq ($(words $(MAKECMDGOALS)),1)
 496                         mixed-targets := 1
 497                 endif
 498         endif
 499 endif
 500 # install and module_install need also be processed one by one
 501 ifneq ($(filter install,$(MAKECMDGOALS)),)
 502         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 503                 mixed-targets := 1
 504         endif
 505 endif
 506
 507 ifeq ($(cc-name),clang)
 508 ifneq ($(CROSS_COMPILE),)
 509 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
 510 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 511 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 512 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 513 endif
 514 ifneq ($(GCC_TOOLCHAIN),)
 515 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 516 endif
 517 CLANG_FLAGS     += -no-integrated-as
 518 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 519 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 520 endif
 521
 522
 523 ifeq ($(mixed-targets),1)
 524 # ===========================================================================
 525 # We're called with mixed targets (*config and build targets).
 526 # Handle them one by one.
 527
 528 PHONY += $(MAKECMDGOALS) __build_one_by_one
 529
 530 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 531         @:
 532
 533 __build_one_by_one:
 534         $(Q)set -e; \
 535         for i in $(MAKECMDGOALS); do \
 536                 $(MAKE) -f $(srctree)/Makefile $$i; \
 537         done
 538
 539 else
 540 ifeq ($(config-targets),1)
 541 # ===========================================================================
 542 # *config targets only - make sure prerequisites are updated, and descend
 543 # in scripts/kconfig to make the *config target
 544
 545 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 546 # KBUILD_DEFCONFIG may point out an alternative default configuration
 547 # used for 'make defconfig'
 548 include arch/$(SRCARCH)/Makefile
 549 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 550
 551 config: scripts_basic outputmakefile FORCE
 552         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 553
 554 %config: scripts_basic outputmakefile FORCE
 555         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 556
 557 else
 558 # ===========================================================================
 559 # Build targets only - this includes vmlinux, arch specific targets, clean
 560 # targets and others. In general all targets except *config targets.
 561
 562 ifeq ($(KBUILD_EXTMOD),)
 563 # Additional helpers built in scripts/
 564 # Carefully list dependencies so we do not try to build scripts twice
 565 # in parallel
 566 PHONY += scripts
 567 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 568          asm-generic gcc-plugins
 569         $(Q)$(MAKE) $(build)=$(@)
 570
 571 # Objects we will link into vmlinux / subdirs we need to visit
 572 init-y          := init/
 573 drivers-y       := drivers/ sound/ firmware/
 574 net-y           := net/
 575 libs-y          := lib/
 576 core-y          := usr/
 577 virt-y          := virt/
 578 endif # KBUILD_EXTMOD
 579
 580 ifeq ($(dot-config),1)
 581 # Read in config
 582 -include include/config/auto.conf
 583
 584 ifeq ($(KBUILD_EXTMOD),)
 585 # Read in dependencies to all Kconfig* files, make sure to run
 586 # oldconfig if changes are detected.
 587 -include include/config/auto.conf.cmd
 588
 589 # To avoid any implicit rule to kick in, define an empty command
 590 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 591
 592 # If .config is newer than include/config/auto.conf, someone tinkered
 593 # with it and forgot to run make oldconfig.
 594 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 595 # we execute the config step to be sure to catch updated Kconfig files
 596 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 597         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 598 else
 599 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 600 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 601 PHONY += include/config/auto.conf
 602
 603 include/config/auto.conf:
 604         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 605         echo >&2;                                                       \
 606         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 607         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 608         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 609         echo >&2 ;                                                      \
 610         /bin/false)
 611
 612 endif # KBUILD_EXTMOD
 613
 614 else
 615 # Dummy target needed, because used as prerequisite
 616 include/config/auto.conf: ;
 617 endif # $(dot-config)
 618
 619 # For the kernel to actually contain only the needed exported symbols,
 620 # we have to build modules as well to determine what those symbols are.
 621 # (this can be evaluated only once include/config/auto.conf has been included)
 622 ifdef CONFIG_TRIM_UNUSED_KSYMS
 623   KBUILD_MODULES := 1
 624 endif
 625
 626 # The all: target is the default when no target is given on the
 627 # command line.
 628 # This allow a user to issue only 'make' to build a kernel including modules
 629 # Defaults to vmlinux, but the arch makefile usually adds further targets
 630 all: vmlinux
 631
 632 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 633 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 634 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 635 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 636 export CFLAGS_GCOV CFLAGS_KCOV
 637
 638 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 639 # values of the respective KBUILD_* variables
 640 ARCH_CPPFLAGS :=
 641 ARCH_AFLAGS :=
 642 ARCH_CFLAGS :=
 643 include arch/$(SRCARCH)/Makefile
 644
 645 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 646 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 647 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 648 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 649 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 650 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 651
 652 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 653 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 654 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 655 endif
 656
 657 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 658 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 659 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 660 else
 661 ifdef CONFIG_PROFILE_ALL_BRANCHES
 662 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 663 else
 664 KBUILD_CFLAGS   += -O2
 665 endif
 666 endif
 667
 668 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 669                         $(call cc-disable-warning,maybe-uninitialized,))
 670
 671 # Tell gcc to never replace conditional load with a non-conditional one
 672 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 673
 674 # check for 'asm goto'
 675 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 676         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 677         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 678 endif
 679
 680 include scripts/Makefile.gcc-plugins
 681
 682 ifdef CONFIG_READABLE_ASM
 683 # Disable optimizations that make assembler listings hard to read.
 684 # reorder blocks reorders the control in the function
 685 # ipa clone creates specialized cloned functions
 686 # partial inlining inlines only parts of functions
 687 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 688                  $(call cc-option,-fno-ipa-cp-clone,) \
 689                  $(call cc-option,-fno-partial-inlining)
 690 endif
 691
 692 ifneq ($(CONFIG_FRAME_WARN),0)
 693 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 694 endif
 695
 696 # This selects the stack protector compiler flag. Testing it is delayed
 697 # until after .config has been reprocessed, in the prepare-compiler-check
 698 # target.
 699 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 700   stackp-flag := -fstack-protector
 701   stackp-name := REGULAR
 702 else
 703 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 704   stackp-flag := -fstack-protector-strong
 705   stackp-name := STRONG
 706 else
 707   # Force off for distro compilers that enable stack protector by default.
 708   stackp-flag := $(call cc-option, -fno-stack-protector)
 709 endif
 710 endif
 711 # Find arch-specific stack protector compiler sanity-checking script.
 712 ifdef CONFIG_CC_STACKPROTECTOR
 713   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 714   stackp-check := $(wildcard $(stackp-path))
 715 endif
 716 KBUILD_CFLAGS += $(stackp-flag)
 717
 718 ifeq ($(cc-name),clang)
 719 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 720 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 721 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 722 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 723 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 724 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 725 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 726 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 727 # See modpost pattern 2
 728 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 729 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 730 else
 731
 732 # These warnings generated too much noise in a regular build.
 733 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 734 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 735 endif
 736
 737 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 738 ifdef CONFIG_FRAME_POINTER
 739 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 740 else
 741 # Some targets (ARM with Thumb2, for example), can't be built with frame
 742 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 743 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 744 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 745 # -fomit-frame-pointer with FUNCTION_TRACER.
 746 ifndef CONFIG_FUNCTION_TRACER
 747 KBUILD_CFLAGS   += -fomit-frame-pointer
 748 endif
 749 endif
 750
 751 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 752
 753 ifdef CONFIG_DEBUG_INFO
 754 ifdef CONFIG_DEBUG_INFO_SPLIT
 755 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 756 else
 757 KBUILD_CFLAGS   += -g
 758 endif
 759 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 760 endif
 761 ifdef CONFIG_DEBUG_INFO_DWARF4
 762 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 763 endif
 764
 765 ifdef CONFIG_DEBUG_INFO_REDUCED
 766 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 767                    $(call cc-option,-fno-var-tracking)
 768 endif
 769
 770 ifdef CONFIG_FUNCTION_TRACER
 771 ifndef CC_FLAGS_FTRACE
 772 CC_FLAGS_FTRACE := -pg
 773 endif
 774 export CC_FLAGS_FTRACE
 775 ifdef CONFIG_HAVE_FENTRY
 776 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 777 endif
 778 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 779 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 780 ifdef CONFIG_DYNAMIC_FTRACE
 781         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 782                 BUILD_C_RECORDMCOUNT := y
 783                 export BUILD_C_RECORDMCOUNT
 784         endif
 785 endif
 786 endif
 787
 788 # We trigger additional mismatches with less inlining
 789 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 790 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 791 endif
 792
 793 # arch Makefile may override CC so keep this after arch Makefile is included
 794 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 795 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 796
 797 # warn about C99 declaration after statement
 798 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 799
 800 # disable pointer signed / unsigned warnings in gcc 4.0
 801 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 802
 803 # disable stringop warnings in gcc 8+
 804 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 805
 806 # disable invalid "can't wrap" optimizations for signed / pointers
 807 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 808
 809 # clang sets -fmerge-all-constants by default as optimization, but this
 810 # is non-conforming behavior for C and in fact breaks the kernel, so we
 811 # need to disable it here generally.
 812 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 813
 814 # for gcc -fno-merge-all-constants disables everything, but it is fine
 815 # to have actual conforming behavior enabled.
 816 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 817
 818 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 819 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 820
 821 # conserve stack if available
 822 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 823
 824 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 825 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 826
 827 # require functions to have arguments in prototypes, not empty 'int foo()'
 828 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 829
 830 # Prohibit date/time macros, which would make the build non-deterministic
 831 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 832
 833 # enforce correct pointer usage
 834 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 835
 836 # use the deterministic mode of AR if available
 837 KBUILD_ARFLAGS := $(call ar-option,D)
 838
 839 include scripts/Makefile.kasan
 840 include scripts/Makefile.extrawarn
 841 include scripts/Makefile.ubsan
 842
 843 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 844 # last assignments
 845 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 846 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 847 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 848
 849 # Use --build-id when available.
 850 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 851                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 852 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 853 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 854
 855 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 856 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 857 endif
 858
 859 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 860 LDFLAGS_vmlinux += $(call ld-option, -X,)
 861 endif
 862
 863 # Default kernel image to build when no specific target is given.
 864 # KBUILD_IMAGE may be overruled on the command line or
 865 # set in the environment
 866 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 867 # this default value
 868 export KBUILD_IMAGE ?= vmlinux
 869
 870 #
 871 # INSTALL_PATH specifies where to place the updated kernel and system map
 872 # images. Default is /boot, but you can set it to other values
 873 export  INSTALL_PATH ?= /boot
 874
 875 #
 876 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 877 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 878 # an argument if needed. Otherwise it defaults to the kernel install path
 879 #
 880 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 881
 882 #
 883 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 884 # relocations required by build roots.  This is not defined in the
 885 # makefile but the argument can be passed to make if needed.
 886 #
 887
 888 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 889 export MODLIB
 890
 891 #
 892 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 893 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 894 # the default option --strip-debug will be used.  Otherwise,
 895 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 896
 897 ifdef INSTALL_MOD_STRIP
 898 ifeq ($(INSTALL_MOD_STRIP),1)
 899 mod_strip_cmd = $(STRIP) --strip-debug
 900 else
 901 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 902 endif # INSTALL_MOD_STRIP=1
 903 else
 904 mod_strip_cmd = true
 905 endif # INSTALL_MOD_STRIP
 906 export mod_strip_cmd
 907
 908 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 909 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 910 # or CONFIG_MODULE_COMPRESS_XZ.
 911
 912 mod_compress_cmd = true
 913 ifdef CONFIG_MODULE_COMPRESS
 914   ifdef CONFIG_MODULE_COMPRESS_GZIP
 915     mod_compress_cmd = gzip -n -f
 916   endif # CONFIG_MODULE_COMPRESS_GZIP
 917   ifdef CONFIG_MODULE_COMPRESS_XZ
 918     mod_compress_cmd = xz -f
 919   endif # CONFIG_MODULE_COMPRESS_XZ
 920 endif # CONFIG_MODULE_COMPRESS
 921 export mod_compress_cmd
 922
 923 # Select initial ramdisk compression format, default is gzip(1).
 924 # This shall be used by the dracut(8) tool while creating an initramfs image.
 925 #
 926 INITRD_COMPRESS-y                  := gzip
 927 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 928 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 929 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 930 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 931 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 932 # do not export INITRD_COMPRESS, since we didn't actually
 933 # choose a sane default compression above.
 934 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 935
 936 ifdef CONFIG_MODULE_SIG_ALL
 937 $(eval $(call config_filename,MODULE_SIG_KEY))
 938
 939 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 940 else
 941 mod_sign_cmd = true
 942 endif
 943 export mod_sign_cmd
 944
 945
 946 ifeq ($(KBUILD_EXTMOD),)
 947 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 948
 949 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 950                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 951                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 952
 953 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 954                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 955
 956 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 957 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 958 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 959 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 960 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 961 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 962 libs-y          := $(libs-y1) $(libs-y2)
 963 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 964
 965 # Externally visible symbols (used by link-vmlinux.sh)
 966 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 967 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 968 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 969 export LDFLAGS_vmlinux
 970 # used by scripts/pacmage/Makefile
 971 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 972
 973 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 974
 975 # Include targets which we want to execute sequentially if the rest of the
 976 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 977 # evaluated more than once.
 978 PHONY += vmlinux_prereq
 979 vmlinux_prereq: $(vmlinux-deps) FORCE
 980 ifdef CONFIG_HEADERS_CHECK
 981         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 982 endif
 983 ifdef CONFIG_GDB_SCRIPTS
 984         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 985 endif
 986 ifdef CONFIG_TRIM_UNUSED_KSYMS
 987         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 988           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 989 endif
 990
 991 # standalone target for easier testing
 992 include/generated/autoksyms.h: FORCE
 993         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 994
 995 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 996
 997 # Final link of vmlinux with optional arch pass after final link
 998     cmd_link-vmlinux =                                                 \
 999         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
1000         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1001
1002 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1003         +$(call if_changed,link-vmlinux)
1004
1005 # Build samples along the rest of the kernel
1006 ifdef CONFIG_SAMPLES
1007 vmlinux-dirs += samples
1008 endif
1009
1010 # The actual objects are generated when descending,
1011 # make sure no implicit rule kicks in
1012 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1013
1014 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1015 # Preset locale variables to speed up the build process. Limit locale
1016 # tweaks to this spot to avoid wrong language settings when running
1017 # make menuconfig etc.
1018 # Error messages still appears in the original language
1019
1020 PHONY += $(vmlinux-dirs)
1021 $(vmlinux-dirs): prepare scripts
1022         $(Q)$(MAKE) $(build)=$@
1023
1024 define filechk_kernel.release
1025         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1026 endef
1027
1028 # Store (new) KERNELRELEASE string in include/config/kernel.release
1029 include/config/kernel.release: include/config/auto.conf FORCE
1030         $(call filechk,kernel.release)
1031
1032
1033 # Things we need to do before we recursively start building the kernel
1034 # or the modules are listed in "prepare".
1035 # A multi level approach is used. prepareN is processed before prepareN-1.
1036 # archprepare is used in arch Makefiles and when processed asm symlink,
1037 # version.h and scripts_basic is processed / created.
1038
1039 # Listed in dependency order
1040 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1041
1042 # prepare3 is used to check if we are building in a separate output directory,
1043 # and if so do:
1044 # 1) Check that make has not been executed in the kernel src $(srctree)
1045 prepare3: include/config/kernel.release
1046 ifneq ($(KBUILD_SRC),)
1047         @$(kecho) '  Using $(srctree) as source for kernel'
1048         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1049                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1050                 echo >&2 "  in the '$(srctree)' directory.";\
1051                 /bin/false; \
1052         fi;
1053 endif
1054
1055 # prepare2 creates a makefile if using a separate output directory.
1056 # From this point forward, .config has been reprocessed, so any rules
1057 # that need to depend on updated CONFIG_* values can be checked here.
1058 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1059
1060 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1061                    include/config/auto.conf
1062         $(cmd_crmodverdir)
1063
1064 archprepare: archheaders archscripts prepare1 scripts_basic
1065
1066 prepare0: archprepare gcc-plugins
1067         $(Q)$(MAKE) $(build)=.
1068
1069 # All the preparing..
1070 prepare: prepare0 prepare-objtool
1071
1072 ifdef CONFIG_STACK_VALIDATION
1073   has_libelf := $(call try-run,\
1074                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1075   ifeq ($(has_libelf),1)
1076     objtool_target := tools/objtool FORCE
1077   else
1078     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1079     SKIP_STACK_VALIDATION := 1
1080     export SKIP_STACK_VALIDATION
1081   endif
1082 endif
1083
1084 PHONY += prepare-objtool
1085 prepare-objtool: $(objtool_target)
1086
1087 # Check for CONFIG flags that require compiler support. Abort the build
1088 # after .config has been processed, but before the kernel build starts.
1089 #
1090 # For security-sensitive CONFIG options, we don't want to fallback and/or
1091 # silently change which compiler flags will be used, since that leads to
1092 # producing kernels with different security feature characteristics
1093 # depending on the compiler used. (For example, "But I selected
1094 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1095 PHONY += prepare-compiler-check
1096 prepare-compiler-check: FORCE
1097 # Make sure compiler supports requested stack protector flag.
1098 ifdef stackp-name
1099   ifeq ($(call cc-option, $(stackp-flag)),)
1100         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1101                   $(stackp-flag) not supported by compiler >&2 && exit 1
1102   endif
1103 endif
1104 # Make sure compiler does not have buggy stack-protector support.
1105 ifdef stackp-check
1106   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1107         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1108                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1109   endif
1110 endif
1111         @:
1112
1113 # Generate some files
1114 # ---------------------------------------------------------------------------
1115
1116 # KERNELRELEASE can change from a few different places, meaning version.h
1117 # needs to be updated, so this check is forced on all builds
1118
1119 uts_len := 64
1120 define filechk_utsrelease.h
1121         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1122           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1123           exit 1;                                                         \
1124         fi;                                                               \
1125         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1126 endef
1127
1128 define filechk_version.h
1129         (echo \#define LINUX_VERSION_CODE $(shell                         \
1130         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1131         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1132 endef
1133
1134 $(version_h): $(srctree)/Makefile FORCE
1135         $(call filechk,version.h)
1136         $(Q)rm -f $(old_version_h)
1137
1138 include/generated/utsrelease.h: include/config/kernel.release FORCE
1139         $(call filechk,utsrelease.h)
1140
1141 PHONY += headerdep
1142 headerdep:
1143         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1144         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1145
1146 # ---------------------------------------------------------------------------
1147 # Firmware install
1148 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1149 export INSTALL_FW_PATH
1150
1151 PHONY += firmware_install
1152 firmware_install:
1153         @mkdir -p $(objtree)/firmware
1154         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1155
1156 # ---------------------------------------------------------------------------
1157 # Kernel headers
1158
1159 #Default location for installed headers
1160 export INSTALL_HDR_PATH = $(objtree)/usr
1161
1162 # If we do an all arch process set dst to asm-$(hdr-arch)
1163 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1164
1165 PHONY += archheaders
1166 archheaders:
1167
1168 PHONY += archscripts
1169 archscripts:
1170
1171 PHONY += __headers
1172 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1173         $(Q)$(MAKE) $(build)=scripts build_unifdef
1174
1175 PHONY += headers_install_all
1176 headers_install_all:
1177         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1178
1179 PHONY += headers_install
1180 headers_install: __headers
1181         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1182           $(error Headers not exportable for the $(SRCARCH) architecture))
1183         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1184         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1185
1186 PHONY += headers_check_all
1187 headers_check_all: headers_install_all
1188         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1189
1190 PHONY += headers_check
1191 headers_check: headers_install
1192         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1193         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1194
1195 # ---------------------------------------------------------------------------
1196 # Kernel selftest
1197
1198 PHONY += kselftest
1199 kselftest:
1200         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1201
1202 kselftest-clean:
1203         $(Q)$(MAKE) -C tools/testing/selftests clean
1204
1205 PHONY += kselftest-merge
1206 kselftest-merge:
1207         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1208         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1209                 -m $(objtree)/.config \
1210                 $(srctree)/tools/testing/selftests/*/config
1211         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1212
1213 # ---------------------------------------------------------------------------
1214 # Modules
1215
1216 ifdef CONFIG_MODULES
1217
1218 # By default, build modules as well
1219
1220 all: modules
1221
1222 # Build modules
1223 #
1224 # A module can be listed more than once in obj-m resulting in
1225 # duplicate lines in modules.order files.  Those are removed
1226 # using awk while concatenating to the final file.
1227
1228 PHONY += modules
1229 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1230         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1231         @$(kecho) '  Building modules, stage 2.';
1232         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1233         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1234
1235 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1236         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1237
1238 %/modules.builtin: include/config/auto.conf
1239         $(Q)$(MAKE) $(modbuiltin)=$*
1240
1241
1242 # Target to prepare building external modules
1243 PHONY += modules_prepare
1244 modules_prepare: prepare scripts
1245
1246 # Target to install modules
1247 PHONY += modules_install
1248 modules_install: _modinst_ _modinst_post
1249
1250 PHONY += _modinst_
1251 _modinst_:
1252         @rm -rf $(MODLIB)/kernel
1253         @rm -f $(MODLIB)/source
1254         @mkdir -p $(MODLIB)/kernel
1255         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1256         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1257                 rm -f $(MODLIB)/build ; \
1258                 ln -s $(CURDIR) $(MODLIB)/build ; \
1259         fi
1260         @cp -f $(objtree)/modules.order $(MODLIB)/
1261         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1262         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1263
1264 # This depmod is only for convenience to give the initial
1265 # boot a modules.dep even before / is mounted read-write.  However the
1266 # boot script depmod is the master version.
1267 PHONY += _modinst_post
1268 _modinst_post: _modinst_
1269         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1270         $(call cmd,depmod)
1271
1272 ifeq ($(CONFIG_MODULE_SIG), y)
1273 PHONY += modules_sign
1274 modules_sign:
1275         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1276 endif
1277
1278 else # CONFIG_MODULES
1279
1280 # Modules not configured
1281 # ---------------------------------------------------------------------------
1282
1283 PHONY += modules modules_install
1284 modules modules_install:
1285         @echo >&2
1286         @echo >&2 "The present kernel configuration has modules disabled."
1287         @echo >&2 "Type 'make config' and enable loadable module support."
1288         @echo >&2 "Then build a kernel with module support enabled."
1289         @echo >&2
1290         @exit 1
1291
1292 endif # CONFIG_MODULES
1293
1294 ###
1295 # Cleaning is done on three levels.
1296 # make clean     Delete most generated files
1297 #                Leave enough to build external modules
1298 # make mrproper  Delete the current configuration, and all generated files
1299 # make distclean Remove editor backup files, patch leftover files and the like
1300
1301 # Directories & files removed with 'make clean'
1302 CLEAN_DIRS  += $(MODVERDIR)
1303
1304 # Directories & files removed with 'make mrproper'
1305 MRPROPER_DIRS  += include/config usr/include include/generated          \
1306                   arch/*/include/generated .tmp_objdiff
1307 MRPROPER_FILES += .config .config.old .version .old_version \
1308                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1309                   signing_key.pem signing_key.priv signing_key.x509     \
1310                   x509.genkey extra_certificates signing_key.x509.keyid \
1311                   signing_key.x509.signer vmlinux-gdb.py
1312
1313 # clean - Delete most, but leave enough to build external modules
1314 #
1315 clean: rm-dirs  := $(CLEAN_DIRS)
1316 clean: rm-files := $(CLEAN_FILES)
1317 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1318
1319 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1320 $(clean-dirs):
1321         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1322
1323 vmlinuxclean:
1324         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1325         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1326
1327 clean: archclean vmlinuxclean
1328
1329 # mrproper - Delete all generated files, including .config
1330 #
1331 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1332 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1333 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1334
1335 PHONY += $(mrproper-dirs) mrproper archmrproper
1336 $(mrproper-dirs):
1337         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1338
1339 mrproper: clean archmrproper $(mrproper-dirs)
1340         $(call cmd,rmdirs)
1341         $(call cmd,rmfiles)
1342
1343 # distclean
1344 #
1345 PHONY += distclean
1346
1347 distclean: mrproper
1348         @find $(srctree) $(RCS_FIND_IGNORE) \
1349                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1350                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1351                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1352                 -type f -print | xargs rm -f
1353
1354
1355 # Packaging of the kernel to various formats
1356 # ---------------------------------------------------------------------------
1357 # rpm target kept for backward compatibility
1358 package-dir     := scripts/package
1359
1360 %src-pkg: FORCE
1361         $(Q)$(MAKE) $(build)=$(package-dir) $@
1362 %pkg: include/config/kernel.release FORCE
1363         $(Q)$(MAKE) $(build)=$(package-dir) $@
1364 rpm: include/config/kernel.release FORCE
1365         $(Q)$(MAKE) $(build)=$(package-dir) $@
1366
1367
1368 # Brief documentation of the typical targets used
1369 # ---------------------------------------------------------------------------
1370
1371 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1372 boards := $(sort $(notdir $(boards)))
1373 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1374 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1375
1376 PHONY += help
1377 help:
1378         @echo  'Cleaning targets:'
1379         @echo  '  clean           - Remove most generated files but keep the config and'
1380         @echo  '                    enough build support to build external modules'
1381         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1382         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1383         @echo  ''
1384         @echo  'Configuration targets:'
1385         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1386         @echo  ''
1387         @echo  'Other generic targets:'
1388         @echo  '  all             - Build all targets marked with [*]'
1389         @echo  '* vmlinux         - Build the bare kernel'
1390         @echo  '* modules         - Build all modules'
1391         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1392         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1393         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1394         @echo  '  dir/            - Build all files in dir and below'
1395         @echo  '  dir/file.[ois]  - Build specified target only'
1396         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1397         @echo  '                    (requires compiler support for LLVM assembly generation)'
1398         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1399         @echo  '                    (requires a recent binutils and recent build (System.map))'
1400         @echo  '  dir/file.ko     - Build module including final link'
1401         @echo  '  modules_prepare - Set up for building external modules'
1402         @echo  '  tags/TAGS       - Generate tags file for editors'
1403         @echo  '  cscope          - Generate cscope index'
1404         @echo  '  gtags           - Generate GNU GLOBAL index'
1405         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1406         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1407         @echo  '  image_name      - Output the image name (use with make -s)'
1408         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1409          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1410          echo  ''
1411         @echo  'Static analysers'
1412         @echo  '  checkstack      - Generate a list of stack hogs'
1413         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1414         @echo  '  versioncheck    - Sanity check on version.h usage'
1415         @echo  '  includecheck    - Check for duplicate included header files'
1416         @echo  '  export_report   - List the usages of all exported symbols'
1417         @echo  '  headers_check   - Sanity check on exported headers'
1418         @echo  '  headerdep       - Detect inclusion cycles in headers'
1419         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1420         @echo  ''
1421         @echo  'Kernel selftest'
1422         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1423         @echo  '                    Build, install, and boot kernel before'
1424         @echo  '                    running kselftest on it'
1425         @echo  '  kselftest-clean - Remove all generated kselftest files'
1426         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1427         @echo  '                    .config.'
1428         @echo  ''
1429         @echo  'Kernel packaging:'
1430         @$(MAKE) $(build)=$(package-dir) help
1431         @echo  ''
1432         @echo  'Documentation targets:'
1433         @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1434         @echo  ''
1435         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1436         @echo  ''
1437         @echo  'Architecture specific targets ($(SRCARCH)):'
1438         @$(if $(archhelp),$(archhelp),\
1439                 echo '  No architecture specific help defined for $(SRCARCH)')
1440         @echo  ''
1441         @$(if $(boards), \
1442                 $(foreach b, $(boards), \
1443                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1444                 echo '')
1445         @$(if $(board-dirs), \
1446                 $(foreach b, $(board-dirs), \
1447                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1448                 printf "  %-16s - Show all of the above\\n" help-boards; \
1449                 echo '')
1450
1451         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1452         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1453         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1454         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1455         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1456         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1457         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1458         @echo  '                1: warnings which may be relevant and do not occur too often'
1459         @echo  '                2: warnings which occur quite often but may still be relevant'
1460         @echo  '                3: more obscure warnings, can most likely be ignored'
1461         @echo  '                Multiple levels can be combined with W=12 or W=123'
1462         @echo  ''
1463         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1464         @echo  'For further info see the ./README file'
1465
1466
1467 help-board-dirs := $(addprefix help-,$(board-dirs))
1468
1469 help-boards: $(help-board-dirs)
1470
1471 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1472
1473 $(help-board-dirs): help-%:
1474         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1475         @$(if $(boards-per-dir), \
1476                 $(foreach b, $(boards-per-dir), \
1477                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1478                 echo '')
1479
1480
1481 # Documentation targets
1482 # ---------------------------------------------------------------------------
1483 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1484 PHONY += $(DOC_TARGETS)
1485 $(DOC_TARGETS): scripts_basic FORCE
1486         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1487         $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1488         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1489
1490 else # KBUILD_EXTMOD
1491
1492 ###
1493 # External module support.
1494 # When building external modules the kernel used as basis is considered
1495 # read-only, and no consistency checks are made and the make
1496 # system is not used on the basis kernel. If updates are required
1497 # in the basis kernel ordinary make commands (without M=...) must
1498 # be used.
1499 #
1500 # The following are the only valid targets when building external
1501 # modules.
1502 # make M=dir clean     Delete all automatically generated files
1503 # make M=dir modules   Make all modules in specified dir
1504 # make M=dir           Same as 'make M=dir modules'
1505 # make M=dir modules_install
1506 #                      Install the modules built in the module directory
1507 #                      Assumes install directory is already created
1508
1509 # We are always building modules
1510 KBUILD_MODULES := 1
1511 PHONY += crmodverdir
1512 crmodverdir:
1513         $(cmd_crmodverdir)
1514
1515 PHONY += $(objtree)/Module.symvers
1516 $(objtree)/Module.symvers:
1517         @test -e $(objtree)/Module.symvers || ( \
1518         echo; \
1519         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1520         echo "           is missing; modules will have no dependencies and modversions."; \
1521         echo )
1522
1523 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1524 PHONY += $(module-dirs) modules
1525 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1526         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1527
1528 modules: $(module-dirs)
1529         @$(kecho) '  Building modules, stage 2.';
1530         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1531
1532 PHONY += modules_install
1533 modules_install: _emodinst_ _emodinst_post
1534
1535 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1536 PHONY += _emodinst_
1537 _emodinst_:
1538         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1539         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1540
1541 PHONY += _emodinst_post
1542 _emodinst_post: _emodinst_
1543         $(call cmd,depmod)
1544
1545 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1546
1547 PHONY += $(clean-dirs) clean
1548 $(clean-dirs):
1549         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1550
1551 clean:  rm-dirs := $(MODVERDIR)
1552 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1553
1554 PHONY += help
1555 help:
1556         @echo  '  Building external modules.'
1557         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1558         @echo  ''
1559         @echo  '  modules         - default target, build the module(s)'
1560         @echo  '  modules_install - install the module'
1561         @echo  '  clean           - remove generated files in module directory only'
1562         @echo  ''
1563
1564 # Dummies...
1565 PHONY += prepare scripts
1566 prepare: ;
1567 scripts: ;
1568 endif # KBUILD_EXTMOD
1569
1570 clean: $(clean-dirs)
1571         $(call cmd,rmdirs)
1572         $(call cmd,rmfiles)
1573         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1574                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1575                 -o -name '*.ko.*' \
1576                 -o -name '*.dwo'  \
1577                 -o -name '*.su'  \
1578                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1579                 -o -name '*.symtypes' -o -name 'modules.order' \
1580                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1581                 -o -name '*.c.[012]*.*' \
1582                 -o -name '*.ll' \
1583                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1584
1585 # Generate tags for editors
1586 # ---------------------------------------------------------------------------
1587 quiet_cmd_tags = GEN     $@
1588       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1589
1590 tags TAGS cscope gtags: FORCE
1591         $(call cmd,tags)
1592
1593 # Scripts to check various things for consistency
1594 # ---------------------------------------------------------------------------
1595
1596 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1597
1598 includecheck:
1599         find $(srctree)/* $(RCS_FIND_IGNORE) \
1600                 -name '*.[hcS]' -type f -print | sort \
1601                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1602
1603 versioncheck:
1604         find $(srctree)/* $(RCS_FIND_IGNORE) \
1605                 -name '*.[hcS]' -type f -print | sort \
1606                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1607
1608 coccicheck:
1609         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1610
1611 namespacecheck:
1612         $(PERL) $(srctree)/scripts/namespace.pl
1613
1614 export_report:
1615         $(PERL) $(srctree)/scripts/export_report.pl
1616
1617 endif #ifeq ($(config-targets),1)
1618 endif #ifeq ($(mixed-targets),1)
1619
1620 PHONY += checkstack kernelrelease kernelversion image_name
1621
1622 # UML needs a little special treatment here.  It wants to use the host
1623 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1624 # else wants $(ARCH), including people doing cross-builds, which means
1625 # that $(SUBARCH) doesn't work here.
1626 ifeq ($(ARCH), um)
1627 CHECKSTACK_ARCH := $(SUBARCH)
1628 else
1629 CHECKSTACK_ARCH := $(ARCH)
1630 endif
1631 checkstack:
1632         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1633         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1634
1635 kernelrelease:
1636         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1637
1638 kernelversion:
1639         @echo $(KERNELVERSION)
1640
1641 image_name:
1642         @echo $(KBUILD_IMAGE)
1643
1644 # Clear a bunch of variables before executing the submake
1645 tools/: FORCE
1646         $(Q)mkdir -p $(objtree)/tools
1647         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1648
1649 tools/%: FORCE
1650         $(Q)mkdir -p $(objtree)/tools
1651         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1652
1653 # Single targets
1654 # ---------------------------------------------------------------------------
1655 # Single targets are compatible with:
1656 # - build with mixed source and output
1657 # - build with separate output dir 'make O=...'
1658 # - external modules
1659 #
1660 #  target-dir => where to store outputfile
1661 #  build-dir  => directory in kernel source tree to use
1662
1663 ifeq ($(KBUILD_EXTMOD),)
1664         build-dir  = $(patsubst %/,%,$(dir $@))
1665         target-dir = $(dir $@)
1666 else
1667         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1668         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1669         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1670 endif
1671
1672 %.s: %.c prepare scripts FORCE
1673         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1674 %.i: %.c prepare scripts FORCE
1675         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1676 %.o: %.c prepare scripts FORCE
1677         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1678 %.lst: %.c prepare scripts FORCE
1679         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1680 %.s: %.S prepare scripts FORCE
1681         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1682 %.o: %.S prepare scripts FORCE
1683         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1684 %.symtypes: %.c prepare scripts FORCE
1685         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1686 %.ll: %.c prepare scripts FORCE
1687         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1688
1689 # Modules
1690 /: prepare scripts FORCE
1691         $(cmd_crmodverdir)
1692         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1693         $(build)=$(build-dir)
1694 # Make sure the latest headers are built for Documentation
1695 Documentation/ samples/: headers_install
1696 %/: prepare scripts FORCE
1697         $(cmd_crmodverdir)
1698         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1699         $(build)=$(build-dir)
1700 %.ko: prepare scripts FORCE
1701         $(cmd_crmodverdir)
1702         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1703         $(build)=$(build-dir) $(@:.ko=.o)
1704         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1705
1706 # FIXME Should go into a make.lib or something
1707 # ===========================================================================
1708
1709 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1710       cmd_rmdirs = rm -rf $(rm-dirs)
1711
1712 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1713       cmd_rmfiles = rm -f $(rm-files)
1714
1715 # Run depmod only if we have System.map and depmod is executable
1716 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1717       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1718                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1719
1720 # Create temporary dir for module support files
1721 # clean it up only when building all modules
1722 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1723                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1724
1725 # read all saved command lines
1726
1727 targets := $(wildcard $(sort $(targets)))
1728 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1729
1730 ifneq ($(cmd_files),)
1731   $(cmd_files): ;       # Do not try to update included dependency files
1732   include $(cmd_files)
1733 endif
1734
1735 endif   # skip-makefile
1736
1737 PHONY += FORCE
1738 FORCE:
1739
1740 # Declare the contents of the .PHONY variable as phony.  We keep that
1741 # information in a variable so we can use it in if_changed and friends.
1742 .PHONY: $(PHONY)