Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 19
   4 SUBLEVEL = 20
   5 EXTRAVERSION =
   6 NAME = "People's Front"
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # o Do not use make's built-in rules and variables
  19 #   (this increases performance and avoids hard-to-debug behaviour);
  20 # o Look for make include files relative to root of kernel src
  21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23 # Avoid funny character set dependencies
  24 unexport LC_ALL
  25 LC_COLLATE=C
  26 LC_NUMERIC=C
  27 export LC_COLLATE LC_NUMERIC
  28
  29 # Avoid interference with shell env settings
  30 unexport GREP_OPTIONS
  31
  32 # We are using a recursive build, so we need to do a little thinking
  33 # to get the ordering right.
  34 #
  35 # Most importantly: sub-Makefiles should only ever modify files in
  36 # their own directory. If in some directory we have a dependency on
  37 # a file in another dir (which doesn't happen often, but it's often
  38 # unavoidable when linking the built-in.a targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Use make M=dir to specify directory of external module to build
 180 # Old syntax make ... SUBDIRS=$PWD is still supported
 181 # Setting the environment variable KBUILD_EXTMOD take precedence
 182 ifdef SUBDIRS
 183   KBUILD_EXTMOD ?= $(SUBDIRS)
 184 endif
 185
 186 ifeq ("$(origin M)", "command line")
 187   KBUILD_EXTMOD := $(M)
 188 endif
 189
 190 ifeq ($(KBUILD_SRC),)
 191         # building in the source tree
 192         srctree := .
 193 else
 194         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 195                 # building in a subdirectory of the source tree
 196                 srctree := ..
 197         else
 198                 srctree := $(KBUILD_SRC)
 199         endif
 200 endif
 201
 202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 203
 204 objtree         := .
 205 src             := $(srctree)
 206 obj             := $(objtree)
 207
 208 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 209
 210 export srctree objtree VPATH
 211
 212 # To make sure we do not include .config for any of the *config targets
 213 # catch them early, and hand them over to scripts/kconfig/Makefile
 214 # It is allowed to specify more targets when calling make, including
 215 # mixing *config targets and build targets.
 216 # For example 'make oldconfig all'.
 217 # Detect when mixed targets is specified, and make a second invocation
 218 # of make so .config is not included in this case either (for *config).
 219
 220 version_h := include/generated/uapi/linux/version.h
 221 old_version_h := include/linux/version.h
 222
 223 clean-targets := %clean mrproper cleandocs
 224 no-dot-config-targets := $(clean-targets) \
 225                          cscope gtags TAGS tags help% %docs check% coccicheck \
 226                          $(version_h) headers_% archheaders archscripts \
 227                          %asm-generic kernelversion %src-pkg
 228 no-sync-config-targets := $(no-dot-config-targets) install %install \
 229                            kernelrelease
 230
 231 config-targets  := 0
 232 mixed-targets   := 0
 233 dot-config      := 1
 234 may-sync-config := 1
 235
 236 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 237         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 238                 dot-config := 0
 239         endif
 240 endif
 241
 242 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 243         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 244                 may-sync-config := 0
 245         endif
 246 endif
 247
 248 ifneq ($(KBUILD_EXTMOD),)
 249         may-sync-config := 0
 250 endif
 251
 252 ifeq ($(KBUILD_EXTMOD),)
 253         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 254                 config-targets := 1
 255                 ifneq ($(words $(MAKECMDGOALS)),1)
 256                         mixed-targets := 1
 257                 endif
 258         endif
 259 endif
 260
 261 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 262 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 263         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 264                 mixed-targets := 1
 265         endif
 266 endif
 267
 268 # install and modules_install need also be processed one by one
 269 ifneq ($(filter install,$(MAKECMDGOALS)),)
 270         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 271                 mixed-targets := 1
 272         endif
 273 endif
 274
 275 ifeq ($(mixed-targets),1)
 276 # ===========================================================================
 277 # We're called with mixed targets (*config and build targets).
 278 # Handle them one by one.
 279
 280 PHONY += $(MAKECMDGOALS) __build_one_by_one
 281
 282 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 283         @:
 284
 285 __build_one_by_one:
 286         $(Q)set -e; \
 287         for i in $(MAKECMDGOALS); do \
 288                 $(MAKE) -f $(srctree)/Makefile $$i; \
 289         done
 290
 291 else
 292
 293 # We need some generic definitions (do not try to remake the file).
 294 scripts/Kbuild.include: ;
 295 include scripts/Kbuild.include
 296
 297 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 298 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 299 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 300 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 301
 302 include scripts/subarch.include
 303
 304 # Cross compiling and selecting different set of gcc/bin-utils
 305 # ---------------------------------------------------------------------------
 306 #
 307 # When performing cross compilation for other architectures ARCH shall be set
 308 # to the target architecture. (See arch/* for the possibilities).
 309 # ARCH can be set during invocation of make:
 310 # make ARCH=ia64
 311 # Another way is to have ARCH set in the environment.
 312 # The default ARCH is the host where make is executed.
 313
 314 # CROSS_COMPILE specify the prefix used for all executables used
 315 # during compilation. Only gcc and related bin-utils executables
 316 # are prefixed with $(CROSS_COMPILE).
 317 # CROSS_COMPILE can be set on the command line
 318 # make CROSS_COMPILE=ia64-linux-
 319 # Alternatively CROSS_COMPILE can be set in the environment.
 320 # Default value for CROSS_COMPILE is not to prefix executables
 321 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 322 ARCH            ?= $(SUBARCH)
 323
 324 # Architecture as present in compile.h
 325 UTS_MACHINE     := $(ARCH)
 326 SRCARCH         := $(ARCH)
 327
 328 # Additional ARCH settings for x86
 329 ifeq ($(ARCH),i386)
 330         SRCARCH := x86
 331 endif
 332 ifeq ($(ARCH),x86_64)
 333         SRCARCH := x86
 334 endif
 335
 336 # Additional ARCH settings for sparc
 337 ifeq ($(ARCH),sparc32)
 338        SRCARCH := sparc
 339 endif
 340 ifeq ($(ARCH),sparc64)
 341        SRCARCH := sparc
 342 endif
 343
 344 # Additional ARCH settings for sh
 345 ifeq ($(ARCH),sh64)
 346        SRCARCH := sh
 347 endif
 348
 349 KCONFIG_CONFIG  ?= .config
 350 export KCONFIG_CONFIG
 351
 352 # SHELL used by kbuild
 353 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 354           else if [ -x /bin/bash ]; then echo /bin/bash; \
 355           else echo sh; fi ; fi)
 356
 357 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 358 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 359 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 360
 361 HOSTCC       = gcc
 362 HOSTCXX      = g++
 363 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 364                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 365                 $(HOSTCFLAGS)
 366 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 367 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 368 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 369
 370 # Make variables (CC, etc...)
 371 AS              = $(CROSS_COMPILE)as
 372 LD              = $(CROSS_COMPILE)ld
 373 CC              = $(CROSS_COMPILE)gcc
 374 CPP             = $(CC) -E
 375 AR              = $(CROSS_COMPILE)ar
 376 NM              = $(CROSS_COMPILE)nm
 377 STRIP           = $(CROSS_COMPILE)strip
 378 OBJCOPY         = $(CROSS_COMPILE)objcopy
 379 OBJDUMP         = $(CROSS_COMPILE)objdump
 380 LEX             = flex
 381 YACC            = bison
 382 AWK             = awk
 383 GENKSYMS        = scripts/genksyms/genksyms
 384 INSTALLKERNEL  := installkernel
 385 DEPMOD          = /sbin/depmod
 386 PERL            = perl
 387 PYTHON          = python
 388 PYTHON2         = python2
 389 PYTHON3         = python3
 390 CHECK           = sparse
 391
 392 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 393                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 394 NOSTDINC_FLAGS  =
 395 CFLAGS_MODULE   =
 396 AFLAGS_MODULE   =
 397 LDFLAGS_MODULE  =
 398 CFLAGS_KERNEL   =
 399 AFLAGS_KERNEL   =
 400 LDFLAGS_vmlinux =
 401
 402 # Use USERINCLUDE when you must reference the UAPI directories only.
 403 USERINCLUDE    := \
 404                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 405                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 406                 -I$(srctree)/include/uapi \
 407                 -I$(objtree)/include/generated/uapi \
 408                 -include $(srctree)/include/linux/kconfig.h
 409
 410 # Use LINUXINCLUDE when you must reference the include/ directory.
 411 # Needed to be compatible with the O= option
 412 LINUXINCLUDE    := \
 413                 -I$(srctree)/arch/$(SRCARCH)/include \
 414                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 415                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 416                 -I$(objtree)/include \
 417                 $(USERINCLUDE)
 418
 419 KBUILD_AFLAGS   := -D__ASSEMBLY__
 420 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 421                    -fno-strict-aliasing -fno-common -fshort-wchar \
 422                    -Werror-implicit-function-declaration \
 423                    -Wno-format-security \
 424                    -std=gnu89
 425 KBUILD_CPPFLAGS := -D__KERNEL__
 426 KBUILD_AFLAGS_KERNEL :=
 427 KBUILD_CFLAGS_KERNEL :=
 428 KBUILD_AFLAGS_MODULE  := -DMODULE
 429 KBUILD_CFLAGS_MODULE  := -DMODULE
 430 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 431 KBUILD_LDFLAGS :=
 432 GCC_PLUGINS_CFLAGS :=
 433
 434 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 435 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 436 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 437 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 438
 439 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 440 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 441 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 442 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 443 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 444 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 445 export KBUILD_ARFLAGS
 446
 447 # When compiling out-of-tree modules, put MODVERDIR in the module
 448 # tree rather than in the kernel tree. The kernel tree might
 449 # even be read-only.
 450 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 451
 452 # Files to ignore in find ... statements
 453
 454 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 455                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 456                           -prune -o
 457 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 458                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 459
 460 # ===========================================================================
 461 # Rules shared between *config targets and build targets
 462
 463 # Basic helpers built in scripts/basic/
 464 PHONY += scripts_basic
 465 scripts_basic:
 466         $(Q)$(MAKE) $(build)=scripts/basic
 467         $(Q)rm -f .tmp_quiet_recordmcount
 468
 469 # To avoid any implicit rule to kick in, define an empty command.
 470 scripts/basic/%: scripts_basic ;
 471
 472 PHONY += outputmakefile
 473 # outputmakefile generates a Makefile in the output directory, if using a
 474 # separate output directory. This allows convenient use of make in the
 475 # output directory.
 476 outputmakefile:
 477 ifneq ($(KBUILD_SRC),)
 478         $(Q)ln -fsn $(srctree) source
 479         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 480             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 481 endif
 482
 483 ifeq ($(cc-name),clang)
 484 ifneq ($(CROSS_COMPILE),)
 485 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
 486 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
 487 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 488 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 489 endif
 490 ifneq ($(GCC_TOOLCHAIN),)
 491 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 492 endif
 493 CLANG_FLAGS     += -no-integrated-as
 494 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 495 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 496 export CLANG_FLAGS
 497 endif
 498
 499 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 500 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 501 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 502 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 503 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 504 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 505 export RETPOLINE_CFLAGS
 506 export RETPOLINE_VDSO_CFLAGS
 507
 508 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 509 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 510
 511 # check for 'asm goto'
 512 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 513   CC_HAVE_ASM_GOTO := 1
 514   KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 515   KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 516 endif
 517
 518 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 519 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 520 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 521 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 522 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 523
 524 ifeq ($(config-targets),1)
 525 # ===========================================================================
 526 # *config targets only - make sure prerequisites are updated, and descend
 527 # in scripts/kconfig to make the *config target
 528
 529 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 530 # KBUILD_DEFCONFIG may point out an alternative default configuration
 531 # used for 'make defconfig'
 532 include arch/$(SRCARCH)/Makefile
 533 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 534
 535 config: scripts_basic outputmakefile FORCE
 536         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 537
 538 %config: scripts_basic outputmakefile FORCE
 539         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 540
 541 else
 542 # ===========================================================================
 543 # Build targets only - this includes vmlinux, arch specific targets, clean
 544 # targets and others. In general all targets except *config targets.
 545
 546 # If building an external module we do not care about the all: rule
 547 # but instead _all depend on modules
 548 PHONY += all
 549 ifeq ($(KBUILD_EXTMOD),)
 550 _all: all
 551 else
 552 _all: modules
 553 endif
 554
 555 # Decide whether to build built-in, modular, or both.
 556 # Normally, just do built-in.
 557
 558 KBUILD_MODULES :=
 559 KBUILD_BUILTIN := 1
 560
 561 # If we have only "make modules", don't compile built-in objects.
 562 # When we're building modules with modversions, we need to consider
 563 # the built-in objects during the descend as well, in order to
 564 # make sure the checksums are up to date before we record them.
 565
 566 ifeq ($(MAKECMDGOALS),modules)
 567   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 568 endif
 569
 570 # If we have "make <whatever> modules", compile modules
 571 # in addition to whatever we do anyway.
 572 # Just "make" or "make all" shall build modules as well
 573
 574 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 575   KBUILD_MODULES := 1
 576 endif
 577
 578 ifeq ($(MAKECMDGOALS),)
 579   KBUILD_MODULES := 1
 580 endif
 581
 582 export KBUILD_MODULES KBUILD_BUILTIN
 583
 584 ifeq ($(KBUILD_EXTMOD),)
 585 # Objects we will link into vmlinux / subdirs we need to visit
 586 init-y          := init/
 587 drivers-y       := drivers/ sound/ firmware/
 588 net-y           := net/
 589 libs-y          := lib/
 590 core-y          := usr/
 591 virt-y          := virt/
 592 endif # KBUILD_EXTMOD
 593
 594 ifeq ($(dot-config),1)
 595 include include/config/auto.conf
 596 endif
 597
 598 # The all: target is the default when no target is given on the
 599 # command line.
 600 # This allow a user to issue only 'make' to build a kernel including modules
 601 # Defaults to vmlinux, but the arch makefile usually adds further targets
 602 all: vmlinux
 603
 604 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 605         $(call cc-option,-fno-tree-loop-im) \
 606         $(call cc-disable-warning,maybe-uninitialized,)
 607 export CFLAGS_GCOV
 608
 609 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 610 ifdef CONFIG_FUNCTION_TRACER
 611   CC_FLAGS_FTRACE := -pg
 612 endif
 613
 614 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 615 # values of the respective KBUILD_* variables
 616 ARCH_CPPFLAGS :=
 617 ARCH_AFLAGS :=
 618 ARCH_CFLAGS :=
 619 include arch/$(SRCARCH)/Makefile
 620
 621 ifeq ($(dot-config),1)
 622 ifeq ($(may-sync-config),1)
 623 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 624 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 625 # because some architectures define CROSS_COMPILE there.
 626 -include include/config/auto.conf.cmd
 627
 628 # To avoid any implicit rule to kick in, define an empty command
 629 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 630
 631 # The actual configuration files used during the build are stored in
 632 # include/generated/ and include/config/. Update them if .config is newer than
 633 # include/config/auto.conf (which mirrors .config).
 634 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 635         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 636 else
 637 # External modules and some install targets need include/generated/autoconf.h
 638 # and include/config/auto.conf but do not care if they are up-to-date.
 639 # Use auto.conf to trigger the test
 640 PHONY += include/config/auto.conf
 641
 642 include/config/auto.conf:
 643         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 644         echo >&2;                                                       \
 645         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 646         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 647         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 648         echo >&2 ;                                                      \
 649         /bin/false)
 650
 651 endif # may-sync-config
 652 endif # $(dot-config)
 653
 654 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 655 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 656 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 657 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 658 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 659
 660 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 661 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 662 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 663 else
 664 ifdef CONFIG_PROFILE_ALL_BRANCHES
 665 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 666 else
 667 KBUILD_CFLAGS   += -O2
 668 endif
 669 endif
 670
 671 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 672                         $(call cc-disable-warning,maybe-uninitialized,))
 673
 674 # Tell gcc to never replace conditional load with a non-conditional one
 675 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 676
 677 include scripts/Makefile.kcov
 678 include scripts/Makefile.gcc-plugins
 679
 680 ifdef CONFIG_READABLE_ASM
 681 # Disable optimizations that make assembler listings hard to read.
 682 # reorder blocks reorders the control in the function
 683 # ipa clone creates specialized cloned functions
 684 # partial inlining inlines only parts of functions
 685 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 686                  $(call cc-option,-fno-ipa-cp-clone,) \
 687                  $(call cc-option,-fno-partial-inlining)
 688 endif
 689
 690 ifneq ($(CONFIG_FRAME_WARN),0)
 691 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 692 endif
 693
 694 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 695 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 696 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 697
 698 KBUILD_CFLAGS += $(stackp-flags-y)
 699
 700 ifeq ($(cc-name),clang)
 701 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 702 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 703 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 704 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 705 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 706 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 707 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 708 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 709 # See modpost pattern 2
 710 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 711 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 712 else
 713
 714 # These warnings generated too much noise in a regular build.
 715 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 716 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 717 endif
 718
 719 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 720 ifdef CONFIG_FRAME_POINTER
 721 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 722 else
 723 # Some targets (ARM with Thumb2, for example), can't be built with frame
 724 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 725 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 726 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 727 # -fomit-frame-pointer with FUNCTION_TRACER.
 728 ifndef CONFIG_FUNCTION_TRACER
 729 KBUILD_CFLAGS   += -fomit-frame-pointer
 730 endif
 731 endif
 732
 733 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 734
 735 ifdef CONFIG_DEBUG_INFO
 736 ifdef CONFIG_DEBUG_INFO_SPLIT
 737 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 738 else
 739 KBUILD_CFLAGS   += -g
 740 endif
 741 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 742 endif
 743 ifdef CONFIG_DEBUG_INFO_DWARF4
 744 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 745 endif
 746
 747 ifdef CONFIG_DEBUG_INFO_REDUCED
 748 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 749                    $(call cc-option,-fno-var-tracking)
 750 endif
 751
 752 ifdef CONFIG_FUNCTION_TRACER
 753 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 754   # gcc 5 supports generating the mcount tables directly
 755   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 756     CC_FLAGS_FTRACE     += -mrecord-mcount
 757     export CC_USING_RECORD_MCOUNT := 1
 758   endif
 759   ifdef CONFIG_HAVE_NOP_MCOUNT
 760     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 761       CC_FLAGS_FTRACE   += -mnop-mcount
 762       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 763     endif
 764   endif
 765 endif
 766 ifdef CONFIG_HAVE_FENTRY
 767   ifeq ($(call cc-option-yn, -mfentry),y)
 768     CC_FLAGS_FTRACE     += -mfentry
 769     CC_FLAGS_USING      += -DCC_USING_FENTRY
 770   endif
 771 endif
 772 export CC_FLAGS_FTRACE
 773 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 774 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 775 ifdef CONFIG_DYNAMIC_FTRACE
 776         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 777                 BUILD_C_RECORDMCOUNT := y
 778                 export BUILD_C_RECORDMCOUNT
 779         endif
 780 endif
 781 endif
 782
 783 # We trigger additional mismatches with less inlining
 784 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 785 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 786 endif
 787
 788 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 789 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 790 LDFLAGS_vmlinux += --gc-sections
 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
 796 # warn about C99 declaration after statement
 797 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 798
 799 # disable pointer signed / unsigned warnings in gcc 4.0
 800 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 801
 802 # disable stringop warnings in gcc 8+
 803 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 804
 805 # disable invalid "can't wrap" optimizations for signed / pointers
 806 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 807
 808 # clang sets -fmerge-all-constants by default as optimization, but this
 809 # is non-conforming behavior for C and in fact breaks the kernel, so we
 810 # need to disable it here generally.
 811 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 812
 813 # for gcc -fno-merge-all-constants disables everything, but it is fine
 814 # to have actual conforming behavior enabled.
 815 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 816
 817 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 818 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 819
 820 # conserve stack if available
 821 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 822
 823 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 824 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 825
 826 # require functions to have arguments in prototypes, not empty 'int foo()'
 827 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 828
 829 # Prohibit date/time macros, which would make the build non-deterministic
 830 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 831
 832 # enforce correct pointer usage
 833 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 834
 835 # Require designated initializers for all marked structures
 836 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 837
 838 # change __FILE__ to the relative path from the srctree
 839 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 840
 841 # use the deterministic mode of AR if available
 842 KBUILD_ARFLAGS := $(call ar-option,D)
 843
 844 include scripts/Makefile.kasan
 845 include scripts/Makefile.extrawarn
 846 include scripts/Makefile.ubsan
 847
 848 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 849 # last assignments
 850 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 851 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 852 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 853
 854 # Use --build-id when available.
 855 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 856 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 857 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 858
 859 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 860 LDFLAGS_vmlinux += $(call ld-option, -X,)
 861 endif
 862
 863 # insure the checker run with the right endianness
 864 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 865
 866 # the checker needs the correct machine size
 867 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 868
 869 # Default kernel image to build when no specific target is given.
 870 # KBUILD_IMAGE may be overruled on the command line or
 871 # set in the environment
 872 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 873 # this default value
 874 export KBUILD_IMAGE ?= vmlinux
 875
 876 #
 877 # INSTALL_PATH specifies where to place the updated kernel and system map
 878 # images. Default is /boot, but you can set it to other values
 879 export  INSTALL_PATH ?= /boot
 880
 881 #
 882 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 883 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 884 # an argument if needed. Otherwise it defaults to the kernel install path
 885 #
 886 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 887
 888 #
 889 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 890 # relocations required by build roots.  This is not defined in the
 891 # makefile but the argument can be passed to make if needed.
 892 #
 893
 894 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 895 export MODLIB
 896
 897 #
 898 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 899 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 900 # the default option --strip-debug will be used.  Otherwise,
 901 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 902
 903 ifdef INSTALL_MOD_STRIP
 904 ifeq ($(INSTALL_MOD_STRIP),1)
 905 mod_strip_cmd = $(STRIP) --strip-debug
 906 else
 907 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 908 endif # INSTALL_MOD_STRIP=1
 909 else
 910 mod_strip_cmd = true
 911 endif # INSTALL_MOD_STRIP
 912 export mod_strip_cmd
 913
 914 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 915 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 916 # or CONFIG_MODULE_COMPRESS_XZ.
 917
 918 mod_compress_cmd = true
 919 ifdef CONFIG_MODULE_COMPRESS
 920   ifdef CONFIG_MODULE_COMPRESS_GZIP
 921     mod_compress_cmd = gzip -n -f
 922   endif # CONFIG_MODULE_COMPRESS_GZIP
 923   ifdef CONFIG_MODULE_COMPRESS_XZ
 924     mod_compress_cmd = xz -f
 925   endif # CONFIG_MODULE_COMPRESS_XZ
 926 endif # CONFIG_MODULE_COMPRESS
 927 export mod_compress_cmd
 928
 929 # Select initial ramdisk compression format, default is gzip(1).
 930 # This shall be used by the dracut(8) tool while creating an initramfs image.
 931 #
 932 INITRD_COMPRESS-y                  := gzip
 933 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 934 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 935 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 936 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 937 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 938 # do not export INITRD_COMPRESS, since we didn't actually
 939 # choose a sane default compression above.
 940 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 941
 942 ifdef CONFIG_MODULE_SIG_ALL
 943 $(eval $(call config_filename,MODULE_SIG_KEY))
 944
 945 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 946 else
 947 mod_sign_cmd = true
 948 endif
 949 export mod_sign_cmd
 950
 951 ifdef CONFIG_STACK_VALIDATION
 952   has_libelf := $(call try-run,\
 953                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 954   ifeq ($(has_libelf),1)
 955     objtool_target := tools/objtool FORCE
 956   else
 957     SKIP_STACK_VALIDATION := 1
 958     export SKIP_STACK_VALIDATION
 959   endif
 960 endif
 961
 962
 963 ifeq ($(KBUILD_EXTMOD),)
 964 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 965
 966 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 967                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 968                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 969
 970 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 971                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 972
 973 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 974 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 975 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 976 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 977 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 978 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 979 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 980
 981 # Externally visible symbols (used by link-vmlinux.sh)
 982 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 983 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 984 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 985 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 986 export LDFLAGS_vmlinux
 987 # used by scripts/package/Makefile
 988 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 989
 990 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 991
 992 # Recurse until adjust_autoksyms.sh is satisfied
 993 PHONY += autoksyms_recursive
 994 autoksyms_recursive: $(vmlinux-deps)
 995 ifdef CONFIG_TRIM_UNUSED_KSYMS
 996         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 997           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 998 endif
 999
1000 # For the kernel to actually contain only the needed exported symbols,
1001 # we have to build modules as well to determine what those symbols are.
1002 # (this can be evaluated only once include/config/auto.conf has been included)
1003 ifdef CONFIG_TRIM_UNUSED_KSYMS
1004   KBUILD_MODULES := 1
1005 endif
1006
1007 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1008
1009 $(autoksyms_h):
1010         $(Q)mkdir -p $(dir $@)
1011         $(Q)touch $@
1012
1013 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1014
1015 # Final link of vmlinux with optional arch pass after final link
1016 cmd_link-vmlinux =                                                 \
1017         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1018         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1019
1020 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1021 ifdef CONFIG_HEADERS_CHECK
1022         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1023 endif
1024 ifdef CONFIG_GDB_SCRIPTS
1025         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1026 endif
1027         +$(call if_changed,link-vmlinux)
1028
1029 # Build samples along the rest of the kernel. This needs headers_install.
1030 ifdef CONFIG_SAMPLES
1031 vmlinux-dirs += samples
1032 samples: headers_install
1033 endif
1034
1035 # The actual objects are generated when descending,
1036 # make sure no implicit rule kicks in
1037 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1038
1039 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1040 # Preset locale variables to speed up the build process. Limit locale
1041 # tweaks to this spot to avoid wrong language settings when running
1042 # make menuconfig etc.
1043 # Error messages still appears in the original language
1044
1045 PHONY += $(vmlinux-dirs)
1046 $(vmlinux-dirs): prepare scripts
1047         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1048
1049 define filechk_kernel.release
1050         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1051 endef
1052
1053 # Store (new) KERNELRELEASE string in include/config/kernel.release
1054 include/config/kernel.release: $(srctree)/Makefile FORCE
1055         $(call filechk,kernel.release)
1056
1057 # Additional helpers built in scripts/
1058 # Carefully list dependencies so we do not try to build scripts twice
1059 # in parallel
1060 PHONY += scripts
1061 scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h)
1062         $(Q)$(MAKE) $(build)=$(@)
1063
1064 # Things we need to do before we recursively start building the kernel
1065 # or the modules are listed in "prepare".
1066 # A multi level approach is used. prepareN is processed before prepareN-1.
1067 # archprepare is used in arch Makefiles and when processed asm symlink,
1068 # version.h and scripts_basic is processed / created.
1069
1070 # Listed in dependency order
1071 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1072
1073 # prepare3 is used to check if we are building in a separate output directory,
1074 # and if so do:
1075 # 1) Check that make has not been executed in the kernel src $(srctree)
1076 prepare3: include/config/kernel.release
1077 ifneq ($(KBUILD_SRC),)
1078         @$(kecho) '  Using $(srctree) as source for kernel'
1079         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1080                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1081                 echo >&2 "  in the '$(srctree)' directory.";\
1082                 /bin/false; \
1083         fi;
1084 endif
1085
1086 # prepare2 creates a makefile if using a separate output directory.
1087 # From this point forward, .config has been reprocessed, so any rules
1088 # that need to depend on updated CONFIG_* values can be checked here.
1089 prepare2: prepare3 outputmakefile asm-generic
1090
1091 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1092         $(cmd_crmodverdir)
1093
1094 archprepare: archheaders archscripts prepare1 scripts_basic
1095
1096 prepare0: archprepare gcc-plugins
1097         $(Q)$(MAKE) $(build)=.
1098
1099 # All the preparing..
1100 prepare: prepare0 prepare-objtool
1101
1102 # Support for using generic headers in asm-generic
1103 PHONY += asm-generic uapi-asm-generic
1104 asm-generic: uapi-asm-generic
1105         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1106                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1107 uapi-asm-generic:
1108         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1109                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1110
1111 PHONY += prepare-objtool
1112 prepare-objtool: $(objtool_target)
1113 ifeq ($(SKIP_STACK_VALIDATION),1)
1114 ifdef CONFIG_UNWINDER_ORC
1115         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1116         @false
1117 else
1118         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1119 endif
1120 endif
1121
1122 # Generate some files
1123 # ---------------------------------------------------------------------------
1124
1125 # KERNELRELEASE can change from a few different places, meaning version.h
1126 # needs to be updated, so this check is forced on all builds
1127
1128 uts_len := 64
1129 define filechk_utsrelease.h
1130         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1131           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1132           exit 1;                                                         \
1133         fi;                                                               \
1134         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1135 endef
1136
1137 define filechk_version.h
1138         (echo \#define LINUX_VERSION_CODE $(shell                         \
1139         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1140         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1141 endef
1142
1143 $(version_h): FORCE
1144         $(call filechk,version.h)
1145         $(Q)rm -f $(old_version_h)
1146
1147 include/generated/utsrelease.h: include/config/kernel.release FORCE
1148         $(call filechk,utsrelease.h)
1149
1150 PHONY += headerdep
1151 headerdep:
1152         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1153         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1154
1155 # ---------------------------------------------------------------------------
1156 # Kernel headers
1157
1158 #Default location for installed headers
1159 export INSTALL_HDR_PATH = $(objtree)/usr
1160
1161 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1162 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1163
1164 PHONY += archheaders
1165 archheaders:
1166
1167 PHONY += archscripts
1168 archscripts:
1169
1170 PHONY += __headers
1171 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1172         $(Q)$(MAKE) $(build)=scripts build_unifdef
1173
1174 PHONY += headers_install_all
1175 headers_install_all:
1176         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1177
1178 PHONY += headers_install
1179 headers_install: __headers
1180         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1181           $(error Headers not exportable for the $(SRCARCH) architecture))
1182         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1183         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1184
1185 PHONY += headers_check_all
1186 headers_check_all: headers_install_all
1187         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1188
1189 PHONY += headers_check
1190 headers_check: headers_install
1191         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1192         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1193
1194 # ---------------------------------------------------------------------------
1195 # Kernel selftest
1196
1197 PHONY += kselftest
1198 kselftest:
1199         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1200
1201 PHONY += kselftest-clean
1202 kselftest-clean:
1203         $(Q)$(MAKE) -C $(srctree)/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
1234 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1235         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1236
1237 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1238         $(Q)$(MAKE) $(modbuiltin)=$*
1239
1240
1241 # Target to prepare building external modules
1242 PHONY += modules_prepare
1243 modules_prepare: prepare scripts
1244
1245 # Target to install modules
1246 PHONY += modules_install
1247 modules_install: _modinst_ _modinst_post
1248
1249 PHONY += _modinst_
1250 _modinst_:
1251         @rm -rf $(MODLIB)/kernel
1252         @rm -f $(MODLIB)/source
1253         @mkdir -p $(MODLIB)/kernel
1254         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1255         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1256                 rm -f $(MODLIB)/build ; \
1257                 ln -s $(CURDIR) $(MODLIB)/build ; \
1258         fi
1259         @cp -f $(objtree)/modules.order $(MODLIB)/
1260         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1261         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1262
1263 # This depmod is only for convenience to give the initial
1264 # boot a modules.dep even before / is mounted read-write.  However the
1265 # boot script depmod is the master version.
1266 PHONY += _modinst_post
1267 _modinst_post: _modinst_
1268         $(call cmd,depmod)
1269
1270 ifeq ($(CONFIG_MODULE_SIG), y)
1271 PHONY += modules_sign
1272 modules_sign:
1273         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1274 endif
1275
1276 else # CONFIG_MODULES
1277
1278 # Modules not configured
1279 # ---------------------------------------------------------------------------
1280
1281 PHONY += modules modules_install
1282 modules modules_install:
1283         @echo >&2
1284         @echo >&2 "The present kernel configuration has modules disabled."
1285         @echo >&2 "Type 'make config' and enable loadable module support."
1286         @echo >&2 "Then build a kernel with module support enabled."
1287         @echo >&2
1288         @exit 1
1289
1290 endif # CONFIG_MODULES
1291
1292 ###
1293 # Cleaning is done on three levels.
1294 # make clean     Delete most generated files
1295 #                Leave enough to build external modules
1296 # make mrproper  Delete the current configuration, and all generated files
1297 # make distclean Remove editor backup files, patch leftover files and the like
1298
1299 # Directories & files removed with 'make clean'
1300 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1301
1302 # Directories & files removed with 'make mrproper'
1303 MRPROPER_DIRS  += include/config usr/include include/generated          \
1304                   arch/*/include/generated .tmp_objdiff
1305 MRPROPER_FILES += .config .config.old .version \
1306                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1307                   signing_key.pem signing_key.priv signing_key.x509     \
1308                   x509.genkey extra_certificates signing_key.x509.keyid \
1309                   signing_key.x509.signer vmlinux-gdb.py
1310
1311 # clean - Delete most, but leave enough to build external modules
1312 #
1313 clean: rm-dirs  := $(CLEAN_DIRS)
1314 clean: rm-files := $(CLEAN_FILES)
1315 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1316
1317 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1318 $(clean-dirs):
1319         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1320
1321 vmlinuxclean:
1322         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1323         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1324
1325 clean: archclean vmlinuxclean
1326
1327 # mrproper - Delete all generated files, including .config
1328 #
1329 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1330 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1331 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1332
1333 PHONY += $(mrproper-dirs) mrproper archmrproper
1334 $(mrproper-dirs):
1335         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1336
1337 mrproper: clean archmrproper $(mrproper-dirs)
1338         $(call cmd,rmdirs)
1339         $(call cmd,rmfiles)
1340
1341 # distclean
1342 #
1343 PHONY += distclean
1344
1345 distclean: mrproper
1346         @find $(srctree) $(RCS_FIND_IGNORE) \
1347                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1348                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1349                 -o -name 'core' \) \
1350                 -type f -print | xargs rm -f
1351
1352
1353 # Packaging of the kernel to various formats
1354 # ---------------------------------------------------------------------------
1355 package-dir     := scripts/package
1356
1357 %src-pkg: FORCE
1358         $(Q)$(MAKE) $(build)=$(package-dir) $@
1359 %pkg: include/config/kernel.release FORCE
1360         $(Q)$(MAKE) $(build)=$(package-dir) $@
1361
1362
1363 # Brief documentation of the typical targets used
1364 # ---------------------------------------------------------------------------
1365
1366 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1367 boards := $(sort $(notdir $(boards)))
1368 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1369 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1370
1371 PHONY += help
1372 help:
1373         @echo  'Cleaning targets:'
1374         @echo  '  clean           - Remove most generated files but keep the config and'
1375         @echo  '                    enough build support to build external modules'
1376         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1377         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1378         @echo  ''
1379         @echo  'Configuration targets:'
1380         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1381         @echo  ''
1382         @echo  'Other generic targets:'
1383         @echo  '  all             - Build all targets marked with [*]'
1384         @echo  '* vmlinux         - Build the bare kernel'
1385         @echo  '* modules         - Build all modules'
1386         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1387         @echo  '  dir/            - Build all files in dir and below'
1388         @echo  '  dir/file.[ois]  - Build specified target only'
1389         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1390         @echo  '                    (requires compiler support for LLVM assembly generation)'
1391         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1392         @echo  '                    (requires a recent binutils and recent build (System.map))'
1393         @echo  '  dir/file.ko     - Build module including final link'
1394         @echo  '  modules_prepare - Set up for building external modules'
1395         @echo  '  tags/TAGS       - Generate tags file for editors'
1396         @echo  '  cscope          - Generate cscope index'
1397         @echo  '  gtags           - Generate GNU GLOBAL index'
1398         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1399         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1400         @echo  '  image_name      - Output the image name (use with make -s)'
1401         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1402          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1403          echo  ''
1404         @echo  'Static analysers:'
1405         @echo  '  checkstack      - Generate a list of stack hogs'
1406         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1407         @echo  '  versioncheck    - Sanity check on version.h usage'
1408         @echo  '  includecheck    - Check for duplicate included header files'
1409         @echo  '  export_report   - List the usages of all exported symbols'
1410         @echo  '  headers_check   - Sanity check on exported headers'
1411         @echo  '  headerdep       - Detect inclusion cycles in headers'
1412         @echo  '  coccicheck      - Check with Coccinelle'
1413         @echo  ''
1414         @echo  'Kernel selftest:'
1415         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1416         @echo  '                    Build, install, and boot kernel before'
1417         @echo  '                    running kselftest on it'
1418         @echo  '  kselftest-clean - Remove all generated kselftest files'
1419         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1420         @echo  '                    .config.'
1421         @echo  ''
1422         @echo 'Userspace tools targets:'
1423         @echo '  use "make tools/help"'
1424         @echo '  or  "cd tools; make help"'
1425         @echo  ''
1426         @echo  'Kernel packaging:'
1427         @$(MAKE) $(build)=$(package-dir) help
1428         @echo  ''
1429         @echo  'Documentation targets:'
1430         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1431         @echo  ''
1432         @echo  'Architecture specific targets ($(SRCARCH)):'
1433         @$(if $(archhelp),$(archhelp),\
1434                 echo '  No architecture specific help defined for $(SRCARCH)')
1435         @echo  ''
1436         @$(if $(boards), \
1437                 $(foreach b, $(boards), \
1438                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1439                 echo '')
1440         @$(if $(board-dirs), \
1441                 $(foreach b, $(board-dirs), \
1442                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1443                 printf "  %-16s - Show all of the above\\n" help-boards; \
1444                 echo '')
1445
1446         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1447         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1448         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1449         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1450         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1451         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1452         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1453         @echo  '                1: warnings which may be relevant and do not occur too often'
1454         @echo  '                2: warnings which occur quite often but may still be relevant'
1455         @echo  '                3: more obscure warnings, can most likely be ignored'
1456         @echo  '                Multiple levels can be combined with W=12 or W=123'
1457         @echo  ''
1458         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1459         @echo  'For further info see the ./README file'
1460
1461
1462 help-board-dirs := $(addprefix help-,$(board-dirs))
1463
1464 help-boards: $(help-board-dirs)
1465
1466 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1467
1468 $(help-board-dirs): help-%:
1469         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1470         @$(if $(boards-per-dir), \
1471                 $(foreach b, $(boards-per-dir), \
1472                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1473                 echo '')
1474
1475
1476 # Documentation targets
1477 # ---------------------------------------------------------------------------
1478 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1479                linkcheckdocs dochelp refcheckdocs
1480 PHONY += $(DOC_TARGETS)
1481 $(DOC_TARGETS): scripts_basic FORCE
1482         $(Q)$(MAKE) $(build)=Documentation $@
1483
1484 else # KBUILD_EXTMOD
1485
1486 ###
1487 # External module support.
1488 # When building external modules the kernel used as basis is considered
1489 # read-only, and no consistency checks are made and the make
1490 # system is not used on the basis kernel. If updates are required
1491 # in the basis kernel ordinary make commands (without M=...) must
1492 # be used.
1493 #
1494 # The following are the only valid targets when building external
1495 # modules.
1496 # make M=dir clean     Delete all automatically generated files
1497 # make M=dir modules   Make all modules in specified dir
1498 # make M=dir           Same as 'make M=dir modules'
1499 # make M=dir modules_install
1500 #                      Install the modules built in the module directory
1501 #                      Assumes install directory is already created
1502
1503 # We are always building modules
1504 KBUILD_MODULES := 1
1505 PHONY += crmodverdir
1506 crmodverdir:
1507         $(cmd_crmodverdir)
1508
1509 PHONY += $(objtree)/Module.symvers
1510 $(objtree)/Module.symvers:
1511         @test -e $(objtree)/Module.symvers || ( \
1512         echo; \
1513         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1514         echo "           is missing; modules will have no dependencies and modversions."; \
1515         echo )
1516
1517 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1518 PHONY += $(module-dirs) modules
1519 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1520         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1521
1522 modules: $(module-dirs)
1523         @$(kecho) '  Building modules, stage 2.';
1524         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1525
1526 PHONY += modules_install
1527 modules_install: _emodinst_ _emodinst_post
1528
1529 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1530 PHONY += _emodinst_
1531 _emodinst_:
1532         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1533         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1534
1535 PHONY += _emodinst_post
1536 _emodinst_post: _emodinst_
1537         $(call cmd,depmod)
1538
1539 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1540
1541 PHONY += $(clean-dirs) clean
1542 $(clean-dirs):
1543         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1544
1545 clean:  rm-dirs := $(MODVERDIR)
1546 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1547
1548 PHONY += help
1549 help:
1550         @echo  '  Building external modules.'
1551         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1552         @echo  ''
1553         @echo  '  modules         - default target, build the module(s)'
1554         @echo  '  modules_install - install the module'
1555         @echo  '  clean           - remove generated files in module directory only'
1556         @echo  ''
1557
1558 # Dummies...
1559 PHONY += prepare scripts
1560 prepare: ;
1561 scripts: ;
1562 endif # KBUILD_EXTMOD
1563
1564 clean: $(clean-dirs)
1565         $(call cmd,rmdirs)
1566         $(call cmd,rmfiles)
1567         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1568                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1569                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1570                 -o -name '*.dwo' -o -name '*.lst' \
1571                 -o -name '*.su'  \
1572                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1573                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1574                 -o -name '*.asn1.[ch]' \
1575                 -o -name '*.symtypes' -o -name 'modules.order' \
1576                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1577                 -o -name '*.c.[012]*.*' \
1578                 -o -name '*.ll' \
1579                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1580
1581 # Generate tags for editors
1582 # ---------------------------------------------------------------------------
1583 quiet_cmd_tags = GEN     $@
1584       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1585
1586 tags TAGS cscope gtags: FORCE
1587         $(call cmd,tags)
1588
1589 # Scripts to check various things for consistency
1590 # ---------------------------------------------------------------------------
1591
1592 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1593
1594 includecheck:
1595         find $(srctree)/* $(RCS_FIND_IGNORE) \
1596                 -name '*.[hcS]' -type f -print | sort \
1597                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1598
1599 versioncheck:
1600         find $(srctree)/* $(RCS_FIND_IGNORE) \
1601                 -name '*.[hcS]' -type f -print | sort \
1602                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1603
1604 coccicheck:
1605         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1606
1607 namespacecheck:
1608         $(PERL) $(srctree)/scripts/namespace.pl
1609
1610 export_report:
1611         $(PERL) $(srctree)/scripts/export_report.pl
1612
1613 endif #ifeq ($(config-targets),1)
1614 endif #ifeq ($(mixed-targets),1)
1615
1616 PHONY += checkstack kernelrelease kernelversion image_name
1617
1618 # UML needs a little special treatment here.  It wants to use the host
1619 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1620 # else wants $(ARCH), including people doing cross-builds, which means
1621 # that $(SUBARCH) doesn't work here.
1622 ifeq ($(ARCH), um)
1623 CHECKSTACK_ARCH := $(SUBARCH)
1624 else
1625 CHECKSTACK_ARCH := $(ARCH)
1626 endif
1627 checkstack:
1628         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1629         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1630
1631 kernelrelease:
1632         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1633
1634 kernelversion:
1635         @echo $(KERNELVERSION)
1636
1637 image_name:
1638         @echo $(KBUILD_IMAGE)
1639
1640 # Clear a bunch of variables before executing the submake
1641 tools/: FORCE
1642         $(Q)mkdir -p $(objtree)/tools
1643         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1644
1645 tools/%: FORCE
1646         $(Q)mkdir -p $(objtree)/tools
1647         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1648
1649 # Single targets
1650 # ---------------------------------------------------------------------------
1651 # Single targets are compatible with:
1652 # - build with mixed source and output
1653 # - build with separate output dir 'make O=...'
1654 # - external modules
1655 #
1656 #  target-dir => where to store outputfile
1657 #  build-dir  => directory in kernel source tree to use
1658
1659 ifeq ($(KBUILD_EXTMOD),)
1660         build-dir  = $(patsubst %/,%,$(dir $@))
1661         target-dir = $(dir $@)
1662 else
1663         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1664         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1665         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1666 endif
1667
1668 %.s: %.c prepare scripts FORCE
1669         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1670 %.i: %.c prepare scripts FORCE
1671         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1672 %.o: %.c prepare scripts FORCE
1673         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1674 %.lst: %.c prepare scripts FORCE
1675         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1676 %.s: %.S prepare scripts FORCE
1677         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1678 %.o: %.S prepare scripts FORCE
1679         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1680 %.symtypes: %.c prepare scripts FORCE
1681         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1682 %.ll: %.c prepare scripts FORCE
1683         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1684
1685 # Modules
1686 /: prepare scripts FORCE
1687         $(cmd_crmodverdir)
1688         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1689         $(build)=$(build-dir)
1690 # Make sure the latest headers are built for Documentation
1691 Documentation/ samples/: headers_install
1692 %/: prepare scripts FORCE
1693         $(cmd_crmodverdir)
1694         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1695         $(build)=$(build-dir)
1696 %.ko: prepare scripts FORCE
1697         $(cmd_crmodverdir)
1698         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1699         $(build)=$(build-dir) $(@:.ko=.o)
1700         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1701
1702 # FIXME Should go into a make.lib or something
1703 # ===========================================================================
1704
1705 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1706       cmd_rmdirs = rm -rf $(rm-dirs)
1707
1708 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1709       cmd_rmfiles = rm -f $(rm-files)
1710
1711 # Run depmod only if we have System.map and depmod is executable
1712 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1713       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1714                    $(KERNELRELEASE)
1715
1716 # Create temporary dir for module support files
1717 # clean it up only when building all modules
1718 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1719                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1720
1721 # read all saved command lines
1722
1723 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1724
1725 ifneq ($(cmd_files),)
1726   $(cmd_files): ;       # Do not try to update included dependency files
1727   include $(cmd_files)
1728 endif
1729
1730 endif   # skip-makefile
1731
1732 PHONY += FORCE
1733 FORCE:
1734
1735 # Declare the contents of the PHONY variable as phony.  We keep that
1736 # information in a variable so we can use it in if_changed and friends.
1737 .PHONY: $(PHONY)