Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 0
   4 SUBLEVEL = 6
   5 EXTRAVERSION =
   6 NAME = Shy Crocodile
   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 # We are using a recursive build, so we need to do a little thinking
  19 # to get the ordering right.
  20 #
  21 # Most importantly: sub-Makefiles should only ever modify files in
  22 # their own directory. If in some directory we have a dependency on
  23 # a file in another dir (which doesn't happen often, but it's often
  24 # unavoidable when linking the built-in.a targets which finally
  25 # turn into vmlinux), we will call a sub make in that other dir, and
  26 # after that we are sure that everything which is in that other dir
  27 # is now up to date.
  28 #
  29 # The only cases where we need to modify files which have global
  30 # effects are thus separated out and done before the recursive
  31 # descending is started. They are now explicitly listed as the
  32 # prepare rule.
  33
  34 ifneq ($(sub-make-done),1)
  35
  36 # Do not use make's built-in rules and variables
  37 # (this increases performance and avoids hard-to-debug behaviour)
  38 MAKEFLAGS += -rR
  39
  40 # Avoid funny character set dependencies
  41 unexport LC_ALL
  42 LC_COLLATE=C
  43 LC_NUMERIC=C
  44 export LC_COLLATE LC_NUMERIC
  45
  46 # Avoid interference with shell env settings
  47 unexport GREP_OPTIONS
  48
  49 # Beautify output
  50 # ---------------------------------------------------------------------------
  51 #
  52 # Normally, we echo the whole command before executing it. By making
  53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  54 # $(quiet) to choose other forms of output instead, e.g.
  55 #
  56 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  57 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  58 #
  59 # If $(quiet) is empty, the whole command will be printed.
  60 # If it is set to "quiet_", only the short version will be printed.
  61 # If it is set to "silent_", nothing will be printed at all, since
  62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  63 #
  64 # A simple variant is to prefix commands with $(Q) - that's useful
  65 # for commands that shall be hidden in non-verbose mode.
  66 #
  67 #       $(Q)ln $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 #
  72 # To put more focus on warnings, be less verbose as default
  73 # Use 'make V=1' to see the full commands
  74
  75 ifeq ("$(origin V)", "command line")
  76   KBUILD_VERBOSE = $(V)
  77 endif
  78 ifndef KBUILD_VERBOSE
  79   KBUILD_VERBOSE = 0
  80 endif
  81
  82 ifeq ($(KBUILD_VERBOSE),1)
  83   quiet =
  84   Q =
  85 else
  86   quiet=quiet_
  87   Q = @
  88 endif
  89
  90 # If the user is running make -s (silent mode), suppress echoing of
  91 # commands
  92
  93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  94   quiet=silent_
  95   tools_silent=s
  96 endif
  97
  98 export quiet Q KBUILD_VERBOSE
  99
 100 # kbuild supports saving output files in a separate directory.
 101 # To locate output files in a separate directory two syntaxes are supported.
 102 # In both cases the working directory must be the root of the kernel src.
 103 # 1) O=
 104 # Use "make O=dir/to/store/output/files/"
 105 #
 106 # 2) Set KBUILD_OUTPUT
 107 # Set the environment variable KBUILD_OUTPUT to point to the directory
 108 # where the output files shall be placed.
 109 # export KBUILD_OUTPUT=dir/to/store/output/files/
 110 # make
 111 #
 112 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 113 # variable.
 114
 115 # KBUILD_SRC is not intended to be used by the regular user (for now),
 116 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(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 # Look for make include files relative to root of kernel src
 140 #
 141 # This does not become effective immediately because MAKEFLAGS is re-parsed
 142 # once after the Makefile is read.  It is OK since we are going to invoke
 143 # 'sub-make' below.
 144 MAKEFLAGS += --include-dir=$(CURDIR)
 145
 146 else
 147
 148 # Do not print "Entering directory ..." at all for in-tree build.
 149 MAKEFLAGS += --no-print-directory
 150
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152
 153 PHONY += $(MAKECMDGOALS) sub-make
 154
 155 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 156         @:
 157
 158 # Invoke a second make in the output directory, passing relevant variables
 159 sub-make:
 160         $(Q)$(MAKE) sub-make-done=1 \
 161         $(if $(KBUILD_OUTPUT),-C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR)) \
 162         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 163
 164 else # sub-make-done
 165 # We process the rest of the Makefile if this is the final invocation of make
 166
 167 # Do not print "Entering directory ...",
 168 # but we want to display it when entering to the output directory
 169 # so that IDEs/editors are able to understand relative filenames.
 170 MAKEFLAGS += --no-print-directory
 171
 172 # Call a source code checker (by default, "sparse") as part of the
 173 # C compilation.
 174 #
 175 # Use 'make C=1' to enable checking of only re-compiled files.
 176 # Use 'make C=2' to enable checking of *all* source files, regardless
 177 # of whether they are re-compiled or not.
 178 #
 179 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 180 # including where to get the "sparse" utility.
 181
 182 ifeq ("$(origin C)", "command line")
 183   KBUILD_CHECKSRC = $(C)
 184 endif
 185 ifndef KBUILD_CHECKSRC
 186   KBUILD_CHECKSRC = 0
 187 endif
 188
 189 # Use make M=dir to specify directory of external module to build
 190 # Old syntax make ... SUBDIRS=$PWD is still supported
 191 # Setting the environment variable KBUILD_EXTMOD take precedence
 192 ifdef SUBDIRS
 193   $(warning ================= WARNING ================)
 194   $(warning 'SUBDIRS' will be removed after Linux 5.3)
 195   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 196   $(warning ==========================================)
 197   KBUILD_EXTMOD ?= $(SUBDIRS)
 198 endif
 199
 200 ifeq ("$(origin M)", "command line")
 201   KBUILD_EXTMOD := $(M)
 202 endif
 203
 204 ifeq ($(KBUILD_SRC),)
 205         # building in the source tree
 206         srctree := .
 207 else
 208         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 209                 # building in a subdirectory of the source tree
 210                 srctree := ..
 211         else
 212                 srctree := $(KBUILD_SRC)
 213         endif
 214 endif
 215
 216 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 217
 218 objtree         := .
 219 src             := $(srctree)
 220 obj             := $(objtree)
 221
 222 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 223
 224 export srctree objtree VPATH
 225
 226 # To make sure we do not include .config for any of the *config targets
 227 # catch them early, and hand them over to scripts/kconfig/Makefile
 228 # It is allowed to specify more targets when calling make, including
 229 # mixing *config targets and build targets.
 230 # For example 'make oldconfig all'.
 231 # Detect when mixed targets is specified, and make a second invocation
 232 # of make so .config is not included in this case either (for *config).
 233
 234 version_h := include/generated/uapi/linux/version.h
 235 old_version_h := include/linux/version.h
 236
 237 clean-targets := %clean mrproper cleandocs
 238 no-dot-config-targets := $(clean-targets) \
 239                          cscope gtags TAGS tags help% %docs check% coccicheck \
 240                          $(version_h) headers_% archheaders archscripts \
 241                          %asm-generic kernelversion %src-pkg
 242 no-sync-config-targets := $(no-dot-config-targets) install %install \
 243                            kernelrelease
 244
 245 config-targets  := 0
 246 mixed-targets   := 0
 247 dot-config      := 1
 248 may-sync-config := 1
 249
 250 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 251         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 252                 dot-config := 0
 253         endif
 254 endif
 255
 256 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 257         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 258                 may-sync-config := 0
 259         endif
 260 endif
 261
 262 ifneq ($(KBUILD_EXTMOD),)
 263         may-sync-config := 0
 264 endif
 265
 266 ifeq ($(KBUILD_EXTMOD),)
 267         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 268                 config-targets := 1
 269                 ifneq ($(words $(MAKECMDGOALS)),1)
 270                         mixed-targets := 1
 271                 endif
 272         endif
 273 endif
 274
 275 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 276 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 277         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 278                 mixed-targets := 1
 279         endif
 280 endif
 281
 282 # install and modules_install need also be processed one by one
 283 ifneq ($(filter install,$(MAKECMDGOALS)),)
 284         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 285                 mixed-targets := 1
 286         endif
 287 endif
 288
 289 ifeq ($(mixed-targets),1)
 290 # ===========================================================================
 291 # We're called with mixed targets (*config and build targets).
 292 # Handle them one by one.
 293
 294 PHONY += $(MAKECMDGOALS) __build_one_by_one
 295
 296 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 297         @:
 298
 299 __build_one_by_one:
 300         $(Q)set -e; \
 301         for i in $(MAKECMDGOALS); do \
 302                 $(MAKE) -f $(srctree)/Makefile $$i; \
 303         done
 304
 305 else
 306
 307 # We need some generic definitions (do not try to remake the file).
 308 scripts/Kbuild.include: ;
 309 include scripts/Kbuild.include
 310
 311 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 312 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 313 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 314 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 315
 316 include scripts/subarch.include
 317
 318 # Cross compiling and selecting different set of gcc/bin-utils
 319 # ---------------------------------------------------------------------------
 320 #
 321 # When performing cross compilation for other architectures ARCH shall be set
 322 # to the target architecture. (See arch/* for the possibilities).
 323 # ARCH can be set during invocation of make:
 324 # make ARCH=ia64
 325 # Another way is to have ARCH set in the environment.
 326 # The default ARCH is the host where make is executed.
 327
 328 # CROSS_COMPILE specify the prefix used for all executables used
 329 # during compilation. Only gcc and related bin-utils executables
 330 # are prefixed with $(CROSS_COMPILE).
 331 # CROSS_COMPILE can be set on the command line
 332 # make CROSS_COMPILE=ia64-linux-
 333 # Alternatively CROSS_COMPILE can be set in the environment.
 334 # Default value for CROSS_COMPILE is not to prefix executables
 335 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 336 ARCH            ?= $(SUBARCH)
 337
 338 # Architecture as present in compile.h
 339 UTS_MACHINE     := $(ARCH)
 340 SRCARCH         := $(ARCH)
 341
 342 # Additional ARCH settings for x86
 343 ifeq ($(ARCH),i386)
 344         SRCARCH := x86
 345 endif
 346 ifeq ($(ARCH),x86_64)
 347         SRCARCH := x86
 348 endif
 349
 350 # Additional ARCH settings for sparc
 351 ifeq ($(ARCH),sparc32)
 352        SRCARCH := sparc
 353 endif
 354 ifeq ($(ARCH),sparc64)
 355        SRCARCH := sparc
 356 endif
 357
 358 # Additional ARCH settings for sh
 359 ifeq ($(ARCH),sh64)
 360        SRCARCH := sh
 361 endif
 362
 363 KCONFIG_CONFIG  ?= .config
 364 export KCONFIG_CONFIG
 365
 366 # SHELL used by kbuild
 367 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 368           else if [ -x /bin/bash ]; then echo /bin/bash; \
 369           else echo sh; fi ; fi)
 370
 371 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 372 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 373 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 374
 375 HOSTCC       = gcc
 376 HOSTCXX      = g++
 377 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 378                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 379                 $(HOSTCFLAGS)
 380 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 381 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 382 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 383
 384 # Make variables (CC, etc...)
 385 AS              = $(CROSS_COMPILE)as
 386 LD              = $(CROSS_COMPILE)ld
 387 CC              = $(CROSS_COMPILE)gcc
 388 CPP             = $(CC) -E
 389 AR              = $(CROSS_COMPILE)ar
 390 NM              = $(CROSS_COMPILE)nm
 391 STRIP           = $(CROSS_COMPILE)strip
 392 OBJCOPY         = $(CROSS_COMPILE)objcopy
 393 OBJDUMP         = $(CROSS_COMPILE)objdump
 394 LEX             = flex
 395 YACC            = bison
 396 AWK             = awk
 397 GENKSYMS        = scripts/genksyms/genksyms
 398 INSTALLKERNEL  := installkernel
 399 DEPMOD          = /sbin/depmod
 400 PERL            = perl
 401 PYTHON          = python
 402 PYTHON2         = python2
 403 PYTHON3         = python3
 404 CHECK           = sparse
 405
 406 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 407                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 408 NOSTDINC_FLAGS  =
 409 CFLAGS_MODULE   =
 410 AFLAGS_MODULE   =
 411 LDFLAGS_MODULE  =
 412 CFLAGS_KERNEL   =
 413 AFLAGS_KERNEL   =
 414 LDFLAGS_vmlinux =
 415
 416 # Use USERINCLUDE when you must reference the UAPI directories only.
 417 USERINCLUDE    := \
 418                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 419                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 420                 -I$(srctree)/include/uapi \
 421                 -I$(objtree)/include/generated/uapi \
 422                 -include $(srctree)/include/linux/kconfig.h
 423
 424 # Use LINUXINCLUDE when you must reference the include/ directory.
 425 # Needed to be compatible with the O= option
 426 LINUXINCLUDE    := \
 427                 -I$(srctree)/arch/$(SRCARCH)/include \
 428                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 429                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 430                 -I$(objtree)/include \
 431                 $(USERINCLUDE)
 432
 433 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 434 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 435                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 436                    -Werror-implicit-function-declaration -Werror=implicit-int \
 437                    -Wno-format-security \
 438                    -std=gnu89
 439 KBUILD_CPPFLAGS := -D__KERNEL__
 440 KBUILD_AFLAGS_KERNEL :=
 441 KBUILD_CFLAGS_KERNEL :=
 442 KBUILD_AFLAGS_MODULE  := -DMODULE
 443 KBUILD_CFLAGS_MODULE  := -DMODULE
 444 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 445 KBUILD_LDFLAGS :=
 446 GCC_PLUGINS_CFLAGS :=
 447
 448 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 449 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 450 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 451 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 452
 453 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 454 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 455 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 456 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 457 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 458 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 459 export KBUILD_ARFLAGS
 460
 461 # When compiling out-of-tree modules, put MODVERDIR in the module
 462 # tree rather than in the kernel tree. The kernel tree might
 463 # even be read-only.
 464 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 465
 466 # Files to ignore in find ... statements
 467
 468 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 469                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 470                           -prune -o
 471 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 472                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 473
 474 # ===========================================================================
 475 # Rules shared between *config targets and build targets
 476
 477 # Basic helpers built in scripts/basic/
 478 PHONY += scripts_basic
 479 scripts_basic:
 480         $(Q)$(MAKE) $(build)=scripts/basic
 481         $(Q)rm -f .tmp_quiet_recordmcount
 482
 483 # To avoid any implicit rule to kick in, define an empty command.
 484 scripts/basic/%: scripts_basic ;
 485
 486 PHONY += outputmakefile
 487 # outputmakefile generates a Makefile in the output directory, if using a
 488 # separate output directory. This allows convenient use of make in the
 489 # output directory.
 490 outputmakefile:
 491 ifneq ($(KBUILD_SRC),)
 492         $(Q)ln -fsn $(srctree) source
 493         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 494 endif
 495
 496 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 497 ifneq ($(CROSS_COMPILE),)
 498 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
 499 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
 500 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 501 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 502 endif
 503 ifneq ($(GCC_TOOLCHAIN),)
 504 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 505 endif
 506 CLANG_FLAGS     += -no-integrated-as
 507 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 508 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 509 export CLANG_FLAGS
 510 endif
 511
 512 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 513 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 514 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 515 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 516 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 517 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 518 export RETPOLINE_CFLAGS
 519 export RETPOLINE_VDSO_CFLAGS
 520
 521 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 522 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 523 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 524 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 525 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 526
 527 ifeq ($(config-targets),1)
 528 # ===========================================================================
 529 # *config targets only - make sure prerequisites are updated, and descend
 530 # in scripts/kconfig to make the *config target
 531
 532 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 533 # KBUILD_DEFCONFIG may point out an alternative default configuration
 534 # used for 'make defconfig'
 535 include arch/$(SRCARCH)/Makefile
 536 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 537
 538 config: scripts_basic outputmakefile FORCE
 539         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 540
 541 %config: scripts_basic outputmakefile FORCE
 542         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 543
 544 else
 545 # ===========================================================================
 546 # Build targets only - this includes vmlinux, arch specific targets, clean
 547 # targets and others. In general all targets except *config targets.
 548
 549 # If building an external module we do not care about the all: rule
 550 # but instead _all depend on modules
 551 PHONY += all
 552 ifeq ($(KBUILD_EXTMOD),)
 553 _all: all
 554 else
 555 _all: modules
 556 endif
 557
 558 # Decide whether to build built-in, modular, or both.
 559 # Normally, just do built-in.
 560
 561 KBUILD_MODULES :=
 562 KBUILD_BUILTIN := 1
 563
 564 # If we have only "make modules", don't compile built-in objects.
 565 # When we're building modules with modversions, we need to consider
 566 # the built-in objects during the descend as well, in order to
 567 # make sure the checksums are up to date before we record them.
 568
 569 ifeq ($(MAKECMDGOALS),modules)
 570   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 571 endif
 572
 573 # If we have "make <whatever> modules", compile modules
 574 # in addition to whatever we do anyway.
 575 # Just "make" or "make all" shall build modules as well
 576
 577 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 578   KBUILD_MODULES := 1
 579 endif
 580
 581 ifeq ($(MAKECMDGOALS),)
 582   KBUILD_MODULES := 1
 583 endif
 584
 585 export KBUILD_MODULES KBUILD_BUILTIN
 586
 587 ifeq ($(KBUILD_EXTMOD),)
 588 # Objects we will link into vmlinux / subdirs we need to visit
 589 init-y          := init/
 590 drivers-y       := drivers/ sound/ firmware/
 591 net-y           := net/
 592 libs-y          := lib/
 593 core-y          := usr/
 594 virt-y          := virt/
 595 endif # KBUILD_EXTMOD
 596
 597 ifeq ($(dot-config),1)
 598 include include/config/auto.conf
 599 endif
 600
 601 # The all: target is the default when no target is given on the
 602 # command line.
 603 # This allow a user to issue only 'make' to build a kernel including modules
 604 # Defaults to vmlinux, but the arch makefile usually adds further targets
 605 all: vmlinux
 606
 607 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 608         $(call cc-option,-fno-tree-loop-im) \
 609         $(call cc-disable-warning,maybe-uninitialized,)
 610 export CFLAGS_GCOV
 611
 612 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 613 ifdef CONFIG_FUNCTION_TRACER
 614   CC_FLAGS_FTRACE := -pg
 615 endif
 616
 617 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 618 # values of the respective KBUILD_* variables
 619 ARCH_CPPFLAGS :=
 620 ARCH_AFLAGS :=
 621 ARCH_CFLAGS :=
 622 include arch/$(SRCARCH)/Makefile
 623
 624 ifeq ($(dot-config),1)
 625 ifeq ($(may-sync-config),1)
 626 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 627 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 628 # because some architectures define CROSS_COMPILE there.
 629 -include include/config/auto.conf.cmd
 630
 631 # To avoid any implicit rule to kick in, define an empty command
 632 $(KCONFIG_CONFIG): ;
 633
 634 # The actual configuration files used during the build are stored in
 635 # include/generated/ and include/config/. Update them if .config is newer than
 636 # include/config/auto.conf (which mirrors .config).
 637 #
 638 # This exploits the 'multi-target pattern rule' trick.
 639 # The syncconfig should be executed only once to make all the targets.
 640 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 641         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 642 else
 643 # External modules and some install targets need include/generated/autoconf.h
 644 # and include/config/auto.conf but do not care if they are up-to-date.
 645 # Use auto.conf to trigger the test
 646 PHONY += include/config/auto.conf
 647
 648 include/config/auto.conf:
 649         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 650         echo >&2;                                                       \
 651         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 652         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 653         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 654         echo >&2 ;                                                      \
 655         /bin/false)
 656
 657 endif # may-sync-config
 658 endif # $(dot-config)
 659
 660 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 661 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 662 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 663 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 664 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 665
 666 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 667 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 668 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 669 else
 670 ifdef CONFIG_PROFILE_ALL_BRANCHES
 671 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 672 else
 673 KBUILD_CFLAGS   += -O2
 674 endif
 675 endif
 676
 677 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 678                         $(call cc-disable-warning,maybe-uninitialized,))
 679
 680 # Tell gcc to never replace conditional load with a non-conditional one
 681 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 682
 683 include scripts/Makefile.kcov
 684 include scripts/Makefile.gcc-plugins
 685
 686 ifdef CONFIG_READABLE_ASM
 687 # Disable optimizations that make assembler listings hard to read.
 688 # reorder blocks reorders the control in the function
 689 # ipa clone creates specialized cloned functions
 690 # partial inlining inlines only parts of functions
 691 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 692                  $(call cc-option,-fno-ipa-cp-clone,) \
 693                  $(call cc-option,-fno-partial-inlining)
 694 endif
 695
 696 ifneq ($(CONFIG_FRAME_WARN),0)
 697 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 698 endif
 699
 700 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 701 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 702 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 703
 704 KBUILD_CFLAGS += $(stackp-flags-y)
 705
 706 ifdef CONFIG_CC_IS_CLANG
 707 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 708 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 709 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 710 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 711 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 712 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 713 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 714 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 715 # See modpost pattern 2
 716 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 717 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 718 else
 719
 720 # These warnings generated too much noise in a regular build.
 721 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 722 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 723 endif
 724
 725 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 726 ifdef CONFIG_FRAME_POINTER
 727 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 728 else
 729 # Some targets (ARM with Thumb2, for example), can't be built with frame
 730 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 731 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 732 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 733 # -fomit-frame-pointer with FUNCTION_TRACER.
 734 ifndef CONFIG_FUNCTION_TRACER
 735 KBUILD_CFLAGS   += -fomit-frame-pointer
 736 endif
 737 endif
 738
 739 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 740
 741 ifdef CONFIG_DEBUG_INFO
 742 ifdef CONFIG_DEBUG_INFO_SPLIT
 743 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 744 else
 745 KBUILD_CFLAGS   += -g
 746 endif
 747 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 748 endif
 749 ifdef CONFIG_DEBUG_INFO_DWARF4
 750 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 751 endif
 752
 753 ifdef CONFIG_DEBUG_INFO_REDUCED
 754 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 755                    $(call cc-option,-fno-var-tracking)
 756 endif
 757
 758 ifdef CONFIG_FUNCTION_TRACER
 759 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 760   # gcc 5 supports generating the mcount tables directly
 761   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 762     CC_FLAGS_FTRACE     += -mrecord-mcount
 763     export CC_USING_RECORD_MCOUNT := 1
 764   endif
 765   ifdef CONFIG_HAVE_NOP_MCOUNT
 766     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 767       CC_FLAGS_FTRACE   += -mnop-mcount
 768       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 769     endif
 770   endif
 771 endif
 772 ifdef CONFIG_HAVE_FENTRY
 773   ifeq ($(call cc-option-yn, -mfentry),y)
 774     CC_FLAGS_FTRACE     += -mfentry
 775     CC_FLAGS_USING      += -DCC_USING_FENTRY
 776   endif
 777 endif
 778 export CC_FLAGS_FTRACE
 779 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 780 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 781 ifdef CONFIG_DYNAMIC_FTRACE
 782         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 783                 BUILD_C_RECORDMCOUNT := y
 784                 export BUILD_C_RECORDMCOUNT
 785         endif
 786 endif
 787 endif
 788
 789 # We trigger additional mismatches with less inlining
 790 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 791 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 792 endif
 793
 794 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 795 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 796 LDFLAGS_vmlinux += --gc-sections
 797 endif
 798
 799 # arch Makefile may override CC so keep this after arch Makefile is included
 800 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 801
 802 # warn about C99 declaration after statement
 803 KBUILD_CFLAGS += -Wdeclaration-after-statement
 804
 805 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 806 KBUILD_CFLAGS += $(call cc-option,-Wvla)
 807
 808 # disable pointer signed / unsigned warnings in gcc 4.0
 809 KBUILD_CFLAGS += -Wno-pointer-sign
 810
 811 # disable stringop warnings in gcc 8+
 812 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 813
 814 # disable invalid "can't wrap" optimizations for signed / pointers
 815 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 816
 817 # clang sets -fmerge-all-constants by default as optimization, but this
 818 # is non-conforming behavior for C and in fact breaks the kernel, so we
 819 # need to disable it here generally.
 820 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 821
 822 # for gcc -fno-merge-all-constants disables everything, but it is fine
 823 # to have actual conforming behavior enabled.
 824 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 825
 826 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 827 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 828
 829 # conserve stack if available
 830 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 831
 832 # Prohibit date/time macros, which would make the build non-deterministic
 833 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 834
 835 # enforce correct pointer usage
 836 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 837
 838 # Require designated initializers for all marked structures
 839 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 840
 841 # change __FILE__ to the relative path from the srctree
 842 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 843
 844 # use the deterministic mode of AR if available
 845 KBUILD_ARFLAGS := $(call ar-option,D)
 846
 847 include scripts/Makefile.kasan
 848 include scripts/Makefile.extrawarn
 849 include scripts/Makefile.ubsan
 850
 851 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 852 # last assignments
 853 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 854 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 855 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 856
 857 # Use --build-id when available.
 858 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 859 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 860 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 861
 862 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 863 LDFLAGS_vmlinux += $(call ld-option, -X,)
 864 endif
 865
 866 # insure the checker run with the right endianness
 867 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 868
 869 # the checker needs the correct machine size
 870 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 871
 872 # Default kernel image to build when no specific target is given.
 873 # KBUILD_IMAGE may be overruled on the command line or
 874 # set in the environment
 875 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 876 # this default value
 877 export KBUILD_IMAGE ?= vmlinux
 878
 879 #
 880 # INSTALL_PATH specifies where to place the updated kernel and system map
 881 # images. Default is /boot, but you can set it to other values
 882 export  INSTALL_PATH ?= /boot
 883
 884 #
 885 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 886 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 887 # an argument if needed. Otherwise it defaults to the kernel install path
 888 #
 889 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 890
 891 #
 892 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 893 # relocations required by build roots.  This is not defined in the
 894 # makefile but the argument can be passed to make if needed.
 895 #
 896
 897 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 898 export MODLIB
 899
 900 #
 901 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 902 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 903 # the default option --strip-debug will be used.  Otherwise,
 904 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 905
 906 ifdef INSTALL_MOD_STRIP
 907 ifeq ($(INSTALL_MOD_STRIP),1)
 908 mod_strip_cmd = $(STRIP) --strip-debug
 909 else
 910 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 911 endif # INSTALL_MOD_STRIP=1
 912 else
 913 mod_strip_cmd = true
 914 endif # INSTALL_MOD_STRIP
 915 export mod_strip_cmd
 916
 917 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 918 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 919 # or CONFIG_MODULE_COMPRESS_XZ.
 920
 921 mod_compress_cmd = true
 922 ifdef CONFIG_MODULE_COMPRESS
 923   ifdef CONFIG_MODULE_COMPRESS_GZIP
 924     mod_compress_cmd = gzip -n -f
 925   endif # CONFIG_MODULE_COMPRESS_GZIP
 926   ifdef CONFIG_MODULE_COMPRESS_XZ
 927     mod_compress_cmd = xz -f
 928   endif # CONFIG_MODULE_COMPRESS_XZ
 929 endif # CONFIG_MODULE_COMPRESS
 930 export mod_compress_cmd
 931
 932 # Select initial ramdisk compression format, default is gzip(1).
 933 # This shall be used by the dracut(8) tool while creating an initramfs image.
 934 #
 935 INITRD_COMPRESS-y                  := gzip
 936 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 937 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 938 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 939 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 940 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 941 # do not export INITRD_COMPRESS, since we didn't actually
 942 # choose a sane default compression above.
 943 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 944
 945 ifdef CONFIG_MODULE_SIG_ALL
 946 $(eval $(call config_filename,MODULE_SIG_KEY))
 947
 948 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 949 else
 950 mod_sign_cmd = true
 951 endif
 952 export mod_sign_cmd
 953
 954 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 955
 956 ifdef CONFIG_STACK_VALIDATION
 957   has_libelf := $(call try-run,\
 958                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
 959   ifeq ($(has_libelf),1)
 960     objtool_target := tools/objtool FORCE
 961   else
 962     SKIP_STACK_VALIDATION := 1
 963     export SKIP_STACK_VALIDATION
 964   endif
 965 endif
 966
 967 PHONY += prepare0
 968
 969 ifeq ($(KBUILD_EXTMOD),)
 970 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 971
 972 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 973                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 974                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 975
 976 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 977                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 978
 979 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 980 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 981 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 982 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 983 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 984 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 985 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 986
 987 # Externally visible symbols (used by link-vmlinux.sh)
 988 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 989 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 990 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 991 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 992 export LDFLAGS_vmlinux
 993 # used by scripts/package/Makefile
 994 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 995
 996 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 997
 998 # Recurse until adjust_autoksyms.sh is satisfied
 999 PHONY += autoksyms_recursive
1000 autoksyms_recursive: $(vmlinux-deps)
1001 ifdef CONFIG_TRIM_UNUSED_KSYMS
1002         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1003           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1004 endif
1005
1006 # For the kernel to actually contain only the needed exported symbols,
1007 # we have to build modules as well to determine what those symbols are.
1008 # (this can be evaluated only once include/config/auto.conf has been included)
1009 ifdef CONFIG_TRIM_UNUSED_KSYMS
1010   KBUILD_MODULES := 1
1011 endif
1012
1013 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1014
1015 $(autoksyms_h):
1016         $(Q)mkdir -p $(dir $@)
1017         $(Q)touch $@
1018
1019 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1020
1021 # Final link of vmlinux with optional arch pass after final link
1022 cmd_link-vmlinux =                                                 \
1023         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1024         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1025
1026 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1027 ifdef CONFIG_GDB_SCRIPTS
1028         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1029 endif
1030         +$(call if_changed,link-vmlinux)
1031
1032 targets := vmlinux
1033
1034 # Build samples along the rest of the kernel. This needs headers_install.
1035 ifdef CONFIG_SAMPLES
1036 vmlinux-dirs += samples
1037 samples: headers_install
1038 endif
1039
1040 # The actual objects are generated when descending,
1041 # make sure no implicit rule kicks in
1042 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1043
1044 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1045 # Preset locale variables to speed up the build process. Limit locale
1046 # tweaks to this spot to avoid wrong language settings when running
1047 # make menuconfig etc.
1048 # Error messages still appears in the original language
1049
1050 PHONY += $(vmlinux-dirs)
1051 $(vmlinux-dirs): prepare
1052         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1053
1054 filechk_kernel.release = \
1055         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1056
1057 # Store (new) KERNELRELEASE string in include/config/kernel.release
1058 include/config/kernel.release: $(srctree)/Makefile FORCE
1059         $(call filechk,kernel.release)
1060
1061 # Additional helpers built in scripts/
1062 # Carefully list dependencies so we do not try to build scripts twice
1063 # in parallel
1064 PHONY += scripts
1065 scripts: scripts_basic scripts_dtc
1066         $(Q)$(MAKE) $(build)=$(@)
1067
1068 # Things we need to do before we recursively start building the kernel
1069 # or the modules are listed in "prepare".
1070 # A multi level approach is used. prepareN is processed before prepareN-1.
1071 # archprepare is used in arch Makefiles and when processed asm symlink,
1072 # version.h and scripts_basic is processed / created.
1073
1074 PHONY += prepare archprepare prepare1 prepare2 prepare3
1075
1076 # prepare3 is used to check if we are building in a separate output directory,
1077 # and if so do:
1078 # 1) Check that make has not been executed in the kernel src $(srctree)
1079 prepare3: include/config/kernel.release
1080 ifneq ($(KBUILD_SRC),)
1081         @$(kecho) '  Using $(srctree) as source for kernel'
1082         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1083                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1084                 echo >&2 "  in the '$(srctree)' directory.";\
1085                 /bin/false; \
1086         fi;
1087 endif
1088
1089 # prepare2 creates a makefile if using a separate output directory.
1090 # From this point forward, .config has been reprocessed, so any rules
1091 # that need to depend on updated CONFIG_* values can be checked here.
1092 prepare2: prepare3 outputmakefile asm-generic
1093
1094 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1095         $(cmd_crmodverdir)
1096
1097 archprepare: archheaders archscripts prepare1 scripts
1098
1099 prepare0: archprepare
1100         $(Q)$(MAKE) $(build)=scripts/mod
1101         $(Q)$(MAKE) $(build)=.
1102
1103 # All the preparing..
1104 prepare: prepare0 prepare-objtool
1105
1106 # Support for using generic headers in asm-generic
1107 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1108
1109 PHONY += asm-generic uapi-asm-generic
1110 asm-generic: uapi-asm-generic
1111         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm
1112 uapi-asm-generic:
1113         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm
1114
1115 PHONY += prepare-objtool
1116 prepare-objtool: $(objtool_target)
1117 ifeq ($(SKIP_STACK_VALIDATION),1)
1118 ifdef CONFIG_UNWINDER_ORC
1119         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1120         @false
1121 else
1122         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1123 endif
1124 endif
1125
1126 # Generate some files
1127 # ---------------------------------------------------------------------------
1128
1129 # KERNELRELEASE can change from a few different places, meaning version.h
1130 # needs to be updated, so this check is forced on all builds
1131
1132 uts_len := 64
1133 define filechk_utsrelease.h
1134         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1135           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1136           exit 1;                                                         \
1137         fi;                                                               \
1138         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1139 endef
1140
1141 define filechk_version.h
1142         echo \#define LINUX_VERSION_CODE $(shell                         \
1143         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1144         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1145 endef
1146
1147 $(version_h): FORCE
1148         $(call filechk,version.h)
1149         $(Q)rm -f $(old_version_h)
1150
1151 include/generated/utsrelease.h: include/config/kernel.release FORCE
1152         $(call filechk,utsrelease.h)
1153
1154 PHONY += headerdep
1155 headerdep:
1156         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1157         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1158
1159 # ---------------------------------------------------------------------------
1160 # Kernel headers
1161
1162 #Default location for installed headers
1163 export INSTALL_HDR_PATH = $(objtree)/usr
1164
1165 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1166 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1167
1168 PHONY += archheaders 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 ifdef CONFIG_HEADERS_CHECK
1195 all: headers_check
1196 endif
1197
1198 # ---------------------------------------------------------------------------
1199 # Kernel selftest
1200
1201 PHONY += kselftest
1202 kselftest:
1203         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1204
1205 PHONY += kselftest-clean
1206 kselftest-clean:
1207         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1208
1209 PHONY += kselftest-merge
1210 kselftest-merge:
1211         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1212         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1213                 -m $(objtree)/.config \
1214                 $(srctree)/tools/testing/selftests/*/config
1215         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1216
1217 # ---------------------------------------------------------------------------
1218 # Devicetree files
1219
1220 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1221 dtstree := arch/$(SRCARCH)/boot/dts
1222 endif
1223
1224 ifneq ($(dtstree),)
1225
1226 %.dtb: prepare3 scripts_dtc
1227         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1228
1229 PHONY += dtbs dtbs_install dt_binding_check
1230 dtbs dtbs_check: prepare3 scripts_dtc
1231         $(Q)$(MAKE) $(build)=$(dtstree)
1232
1233 dtbs_check: export CHECK_DTBS=1
1234 dtbs_check: dt_binding_check
1235
1236 dtbs_install:
1237         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1238
1239 ifdef CONFIG_OF_EARLY_FLATTREE
1240 all: dtbs
1241 endif
1242
1243 endif
1244
1245 PHONY += scripts_dtc
1246 scripts_dtc: scripts_basic
1247         $(Q)$(MAKE) $(build)=scripts/dtc
1248
1249 dt_binding_check: scripts_dtc
1250         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1251
1252 # ---------------------------------------------------------------------------
1253 # Modules
1254
1255 ifdef CONFIG_MODULES
1256
1257 # By default, build modules as well
1258
1259 all: modules
1260
1261 # Build modules
1262 #
1263 # A module can be listed more than once in obj-m resulting in
1264 # duplicate lines in modules.order files.  Those are removed
1265 # using awk while concatenating to the final file.
1266
1267 PHONY += modules
1268 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1269         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1270         @$(kecho) '  Building modules, stage 2.';
1271         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1272
1273 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1274         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1275
1276 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1277         $(Q)$(MAKE) $(modbuiltin)=$*
1278
1279
1280 # Target to prepare building external modules
1281 PHONY += modules_prepare
1282 modules_prepare: prepare
1283
1284 # Target to install modules
1285 PHONY += modules_install
1286 modules_install: _modinst_ _modinst_post
1287
1288 PHONY += _modinst_
1289 _modinst_:
1290         @rm -rf $(MODLIB)/kernel
1291         @rm -f $(MODLIB)/source
1292         @mkdir -p $(MODLIB)/kernel
1293         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1294         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1295                 rm -f $(MODLIB)/build ; \
1296                 ln -s $(CURDIR) $(MODLIB)/build ; \
1297         fi
1298         @cp -f $(objtree)/modules.order $(MODLIB)/
1299         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1300         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1301
1302 # This depmod is only for convenience to give the initial
1303 # boot a modules.dep even before / is mounted read-write.  However the
1304 # boot script depmod is the master version.
1305 PHONY += _modinst_post
1306 _modinst_post: _modinst_
1307         $(call cmd,depmod)
1308
1309 ifeq ($(CONFIG_MODULE_SIG), y)
1310 PHONY += modules_sign
1311 modules_sign:
1312         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1313 endif
1314
1315 else # CONFIG_MODULES
1316
1317 # Modules not configured
1318 # ---------------------------------------------------------------------------
1319
1320 PHONY += modules modules_install
1321 modules modules_install:
1322         @echo >&2
1323         @echo >&2 "The present kernel configuration has modules disabled."
1324         @echo >&2 "Type 'make config' and enable loadable module support."
1325         @echo >&2 "Then build a kernel with module support enabled."
1326         @echo >&2
1327         @exit 1
1328
1329 endif # CONFIG_MODULES
1330
1331 ###
1332 # Cleaning is done on three levels.
1333 # make clean     Delete most generated files
1334 #                Leave enough to build external modules
1335 # make mrproper  Delete the current configuration, and all generated files
1336 # make distclean Remove editor backup files, patch leftover files and the like
1337
1338 # Directories & files removed with 'make clean'
1339 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1340
1341 # Directories & files removed with 'make mrproper'
1342 MRPROPER_DIRS  += include/config usr/include include/generated          \
1343                   arch/*/include/generated .tmp_objdiff
1344 MRPROPER_FILES += .config .config.old .version \
1345                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1346                   signing_key.pem signing_key.priv signing_key.x509     \
1347                   x509.genkey extra_certificates signing_key.x509.keyid \
1348                   signing_key.x509.signer vmlinux-gdb.py
1349
1350 # clean - Delete most, but leave enough to build external modules
1351 #
1352 clean: rm-dirs  := $(CLEAN_DIRS)
1353 clean: rm-files := $(CLEAN_FILES)
1354 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1355
1356 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1357 $(clean-dirs):
1358         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1359
1360 vmlinuxclean:
1361         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1362         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1363
1364 clean: archclean vmlinuxclean
1365
1366 # mrproper - Delete all generated files, including .config
1367 #
1368 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1369 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1370 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1371
1372 PHONY += $(mrproper-dirs) mrproper
1373 $(mrproper-dirs):
1374         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1375
1376 mrproper: clean $(mrproper-dirs)
1377         $(call cmd,rmdirs)
1378         $(call cmd,rmfiles)
1379
1380 # distclean
1381 #
1382 PHONY += distclean
1383
1384 distclean: mrproper
1385         @find $(srctree) $(RCS_FIND_IGNORE) \
1386                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1387                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1388                 -o -name 'core' \) \
1389                 -type f -print | xargs rm -f
1390
1391
1392 # Packaging of the kernel to various formats
1393 # ---------------------------------------------------------------------------
1394 package-dir     := scripts/package
1395
1396 %src-pkg: FORCE
1397         $(Q)$(MAKE) $(build)=$(package-dir) $@
1398 %pkg: include/config/kernel.release FORCE
1399         $(Q)$(MAKE) $(build)=$(package-dir) $@
1400
1401
1402 # Brief documentation of the typical targets used
1403 # ---------------------------------------------------------------------------
1404
1405 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1406 boards := $(sort $(notdir $(boards)))
1407 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1408 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1409
1410 PHONY += help
1411 help:
1412         @echo  'Cleaning targets:'
1413         @echo  '  clean           - Remove most generated files but keep the config and'
1414         @echo  '                    enough build support to build external modules'
1415         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1416         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1417         @echo  ''
1418         @echo  'Configuration targets:'
1419         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1420         @echo  ''
1421         @echo  'Other generic targets:'
1422         @echo  '  all             - Build all targets marked with [*]'
1423         @echo  '* vmlinux         - Build the bare kernel'
1424         @echo  '* modules         - Build all modules'
1425         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1426         @echo  '  dir/            - Build all files in dir and below'
1427         @echo  '  dir/file.[ois]  - Build specified target only'
1428         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1429         @echo  '                    (requires compiler support for LLVM assembly generation)'
1430         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1431         @echo  '                    (requires a recent binutils and recent build (System.map))'
1432         @echo  '  dir/file.ko     - Build module including final link'
1433         @echo  '  modules_prepare - Set up for building external modules'
1434         @echo  '  tags/TAGS       - Generate tags file for editors'
1435         @echo  '  cscope          - Generate cscope index'
1436         @echo  '  gtags           - Generate GNU GLOBAL index'
1437         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1438         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1439         @echo  '  image_name      - Output the image name (use with make -s)'
1440         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1441          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1442          echo  ''
1443         @echo  'Static analysers:'
1444         @echo  '  checkstack      - Generate a list of stack hogs'
1445         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1446         @echo  '  versioncheck    - Sanity check on version.h usage'
1447         @echo  '  includecheck    - Check for duplicate included header files'
1448         @echo  '  export_report   - List the usages of all exported symbols'
1449         @echo  '  headers_check   - Sanity check on exported headers'
1450         @echo  '  headerdep       - Detect inclusion cycles in headers'
1451         @echo  '  coccicheck      - Check with Coccinelle'
1452         @echo  ''
1453         @echo  'Kernel selftest:'
1454         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1455         @echo  '                    Build, install, and boot kernel before'
1456         @echo  '                    running kselftest on it'
1457         @echo  '  kselftest-clean - Remove all generated kselftest files'
1458         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1459         @echo  '                    .config.'
1460         @echo  ''
1461         @$(if $(dtstree), \
1462                 echo 'Devicetree:'; \
1463                 echo '* dtbs            - Build device tree blobs for enabled boards'; \
1464                 echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1465                 echo '')
1466
1467         @echo 'Userspace tools targets:'
1468         @echo '  use "make tools/help"'
1469         @echo '  or  "cd tools; make help"'
1470         @echo  ''
1471         @echo  'Kernel packaging:'
1472         @$(MAKE) $(build)=$(package-dir) help
1473         @echo  ''
1474         @echo  'Documentation targets:'
1475         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1476         @echo  ''
1477         @echo  'Architecture specific targets ($(SRCARCH)):'
1478         @$(if $(archhelp),$(archhelp),\
1479                 echo '  No architecture specific help defined for $(SRCARCH)')
1480         @echo  ''
1481         @$(if $(boards), \
1482                 $(foreach b, $(boards), \
1483                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1484                 echo '')
1485         @$(if $(board-dirs), \
1486                 $(foreach b, $(board-dirs), \
1487                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1488                 printf "  %-16s - Show all of the above\\n" help-boards; \
1489                 echo '')
1490
1491         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1492         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1493         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1494         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1495         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1496         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1497         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1498         @echo  '                1: warnings which may be relevant and do not occur too often'
1499         @echo  '                2: warnings which occur quite often but may still be relevant'
1500         @echo  '                3: more obscure warnings, can most likely be ignored'
1501         @echo  '                Multiple levels can be combined with W=12 or W=123'
1502         @echo  ''
1503         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1504         @echo  'For further info see the ./README file'
1505
1506
1507 help-board-dirs := $(addprefix help-,$(board-dirs))
1508
1509 help-boards: $(help-board-dirs)
1510
1511 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1512
1513 $(help-board-dirs): help-%:
1514         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1515         @$(if $(boards-per-dir), \
1516                 $(foreach b, $(boards-per-dir), \
1517                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1518                 echo '')
1519
1520
1521 # Documentation targets
1522 # ---------------------------------------------------------------------------
1523 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1524                linkcheckdocs dochelp refcheckdocs
1525 PHONY += $(DOC_TARGETS)
1526 $(DOC_TARGETS): scripts_basic FORCE
1527         $(Q)$(MAKE) $(build)=Documentation $@
1528
1529 else # KBUILD_EXTMOD
1530
1531 ###
1532 # External module support.
1533 # When building external modules the kernel used as basis is considered
1534 # read-only, and no consistency checks are made and the make
1535 # system is not used on the basis kernel. If updates are required
1536 # in the basis kernel ordinary make commands (without M=...) must
1537 # be used.
1538 #
1539 # The following are the only valid targets when building external
1540 # modules.
1541 # make M=dir clean     Delete all automatically generated files
1542 # make M=dir modules   Make all modules in specified dir
1543 # make M=dir           Same as 'make M=dir modules'
1544 # make M=dir modules_install
1545 #                      Install the modules built in the module directory
1546 #                      Assumes install directory is already created
1547
1548 # We are always building modules
1549 KBUILD_MODULES := 1
1550
1551 PHONY += $(objtree)/Module.symvers
1552 $(objtree)/Module.symvers:
1553         @test -e $(objtree)/Module.symvers || ( \
1554         echo; \
1555         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1556         echo "           is missing; modules will have no dependencies and modversions."; \
1557         echo )
1558
1559 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1560 PHONY += $(module-dirs) modules
1561 $(module-dirs): prepare $(objtree)/Module.symvers
1562         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1563
1564 modules: $(module-dirs)
1565         @$(kecho) '  Building modules, stage 2.';
1566         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1567
1568 PHONY += modules_install
1569 modules_install: _emodinst_ _emodinst_post
1570
1571 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1572 PHONY += _emodinst_
1573 _emodinst_:
1574         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1575         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1576
1577 PHONY += _emodinst_post
1578 _emodinst_post: _emodinst_
1579         $(call cmd,depmod)
1580
1581 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1582
1583 PHONY += $(clean-dirs) clean
1584 $(clean-dirs):
1585         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1586
1587 clean:  rm-dirs := $(MODVERDIR)
1588 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1589
1590 PHONY += help
1591 help:
1592         @echo  '  Building external modules.'
1593         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1594         @echo  ''
1595         @echo  '  modules         - default target, build the module(s)'
1596         @echo  '  modules_install - install the module'
1597         @echo  '  clean           - remove generated files in module directory only'
1598         @echo  ''
1599
1600 PHONY += prepare
1601 prepare:
1602         $(cmd_crmodverdir)
1603 endif # KBUILD_EXTMOD
1604
1605 clean: $(clean-dirs)
1606         $(call cmd,rmdirs)
1607         $(call cmd,rmfiles)
1608         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1609                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1610                 -o -name '*.ko.*' \
1611                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1612                 -o -name '*.dwo' -o -name '*.lst' \
1613                 -o -name '*.su'  \
1614                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1615                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1616                 -o -name '*.asn1.[ch]' \
1617                 -o -name '*.symtypes' -o -name 'modules.order' \
1618                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1619                 -o -name '*.c.[012]*.*' \
1620                 -o -name '*.ll' \
1621                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1622
1623 # Generate tags for editors
1624 # ---------------------------------------------------------------------------
1625 quiet_cmd_tags = GEN     $@
1626       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1627
1628 tags TAGS cscope gtags: FORCE
1629         $(call cmd,tags)
1630
1631 # Scripts to check various things for consistency
1632 # ---------------------------------------------------------------------------
1633
1634 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1635
1636 includecheck:
1637         find $(srctree)/* $(RCS_FIND_IGNORE) \
1638                 -name '*.[hcS]' -type f -print | sort \
1639                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1640
1641 versioncheck:
1642         find $(srctree)/* $(RCS_FIND_IGNORE) \
1643                 -name '*.[hcS]' -type f -print | sort \
1644                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1645
1646 coccicheck:
1647         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1648
1649 namespacecheck:
1650         $(PERL) $(srctree)/scripts/namespace.pl
1651
1652 export_report:
1653         $(PERL) $(srctree)/scripts/export_report.pl
1654
1655 PHONY += checkstack kernelrelease kernelversion image_name
1656
1657 # UML needs a little special treatment here.  It wants to use the host
1658 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1659 # else wants $(ARCH), including people doing cross-builds, which means
1660 # that $(SUBARCH) doesn't work here.
1661 ifeq ($(ARCH), um)
1662 CHECKSTACK_ARCH := $(SUBARCH)
1663 else
1664 CHECKSTACK_ARCH := $(ARCH)
1665 endif
1666 checkstack:
1667         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1668         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1669
1670 kernelrelease:
1671         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1672
1673 kernelversion:
1674         @echo $(KERNELVERSION)
1675
1676 image_name:
1677         @echo $(KBUILD_IMAGE)
1678
1679 # Clear a bunch of variables before executing the submake
1680 tools/: FORCE
1681         $(Q)mkdir -p $(objtree)/tools
1682         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1683
1684 tools/%: FORCE
1685         $(Q)mkdir -p $(objtree)/tools
1686         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1687
1688 # Single targets
1689 # ---------------------------------------------------------------------------
1690 # Single targets are compatible with:
1691 # - build with mixed source and output
1692 # - build with separate output dir 'make O=...'
1693 # - external modules
1694 #
1695 #  target-dir => where to store outputfile
1696 #  build-dir  => directory in kernel source tree to use
1697
1698 ifeq ($(KBUILD_EXTMOD),)
1699         build-dir  = $(patsubst %/,%,$(dir $@))
1700         target-dir = $(dir $@)
1701 else
1702         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1703         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1704         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1705 endif
1706
1707 %.s: %.c prepare FORCE
1708         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1709 %.i: %.c prepare FORCE
1710         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1711 %.o: %.c prepare FORCE
1712         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1713 %.lst: %.c prepare FORCE
1714         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1715 %.s: %.S prepare FORCE
1716         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1717 %.o: %.S prepare FORCE
1718         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1719 %.symtypes: %.c prepare FORCE
1720         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1721 %.ll: %.c prepare FORCE
1722         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1723
1724 # Modules
1725 /: prepare FORCE
1726         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1727         $(build)=$(build-dir)
1728 # Make sure the latest headers are built for Documentation
1729 Documentation/ samples/: headers_install
1730 %/: prepare FORCE
1731         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1732         $(build)=$(build-dir)
1733 %.ko: prepare FORCE
1734         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1735         $(build)=$(build-dir) $(@:.ko=.o)
1736         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1737
1738 # FIXME Should go into a make.lib or something
1739 # ===========================================================================
1740
1741 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1742       cmd_rmdirs = rm -rf $(rm-dirs)
1743
1744 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1745       cmd_rmfiles = rm -f $(rm-files)
1746
1747 # Run depmod only if we have System.map and depmod is executable
1748 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1749       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1750                    $(KERNELRELEASE)
1751
1752 # Create temporary dir for module support files
1753 # clean it up only when building all modules
1754 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1755                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1756
1757 # read saved command lines for existing targets
1758 existing-targets := $(wildcard $(sort $(targets)))
1759
1760 cmd_files := $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1761 $(cmd_files): ; # Do not try to update included dependency files
1762 -include $(cmd_files)
1763
1764 endif   # ifeq ($(config-targets),1)
1765 endif   # ifeq ($(mixed-targets),1)
1766 endif   # sub-make-done
1767
1768 PHONY += FORCE
1769 FORCE:
1770
1771 # Declare the contents of the PHONY variable as phony.  We keep that
1772 # information in a variable so we can use it in if_changed and friends.
1773 .PHONY: $(PHONY)