Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 18
   4 SUBLEVEL = 10
   5 EXTRAVERSION =
   6 NAME = Merciless Moray
   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                          kernelversion %src-pkg
 228 no-sync-config-targets := $(no-dot-config-targets) install %install
 229
 230 config-targets  := 0
 231 mixed-targets   := 0
 232 dot-config      := 1
 233 may-sync-config := 1
 234
 235 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 236         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 237                 dot-config := 0
 238         endif
 239 endif
 240
 241 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 242         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 243                 may-sync-config := 0
 244         endif
 245 endif
 246
 247 ifneq ($(KBUILD_EXTMOD),)
 248         may-sync-config := 0
 249 endif
 250
 251 ifeq ($(KBUILD_EXTMOD),)
 252         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 253                 config-targets := 1
 254                 ifneq ($(words $(MAKECMDGOALS)),1)
 255                         mixed-targets := 1
 256                 endif
 257         endif
 258 endif
 259
 260 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 261 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 262         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 263                 mixed-targets := 1
 264         endif
 265 endif
 266
 267 # install and modules_install need also be processed one by one
 268 ifneq ($(filter install,$(MAKECMDGOALS)),)
 269         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 270                 mixed-targets := 1
 271         endif
 272 endif
 273
 274 ifeq ($(mixed-targets),1)
 275 # ===========================================================================
 276 # We're called with mixed targets (*config and build targets).
 277 # Handle them one by one.
 278
 279 PHONY += $(MAKECMDGOALS) __build_one_by_one
 280
 281 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 282         @:
 283
 284 __build_one_by_one:
 285         $(Q)set -e; \
 286         for i in $(MAKECMDGOALS); do \
 287                 $(MAKE) -f $(srctree)/Makefile $$i; \
 288         done
 289
 290 else
 291
 292 # We need some generic definitions (do not try to remake the file).
 293 scripts/Kbuild.include: ;
 294 include scripts/Kbuild.include
 295
 296 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 297 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 298 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 299 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 300
 301 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 302 # first, and if a usermode build is happening, the "ARCH=um" on the command
 303 # line overrides the setting of ARCH below.  If a native build is happening,
 304 # then ARCH is assigned, getting whatever value it gets normally, and
 305 # SUBARCH is subsequently ignored.
 306
 307 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 308                                   -e s/sun4u/sparc64/ \
 309                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 310                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 311                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 312                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
 313                                   -e s/riscv.*/riscv/)
 314
 315 # Cross compiling and selecting different set of gcc/bin-utils
 316 # ---------------------------------------------------------------------------
 317 #
 318 # When performing cross compilation for other architectures ARCH shall be set
 319 # to the target architecture. (See arch/* for the possibilities).
 320 # ARCH can be set during invocation of make:
 321 # make ARCH=ia64
 322 # Another way is to have ARCH set in the environment.
 323 # The default ARCH is the host where make is executed.
 324
 325 # CROSS_COMPILE specify the prefix used for all executables used
 326 # during compilation. Only gcc and related bin-utils executables
 327 # are prefixed with $(CROSS_COMPILE).
 328 # CROSS_COMPILE can be set on the command line
 329 # make CROSS_COMPILE=ia64-linux-
 330 # Alternatively CROSS_COMPILE can be set in the environment.
 331 # Default value for CROSS_COMPILE is not to prefix executables
 332 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 333 ARCH            ?= $(SUBARCH)
 334
 335 # Architecture as present in compile.h
 336 UTS_MACHINE     := $(ARCH)
 337 SRCARCH         := $(ARCH)
 338
 339 # Additional ARCH settings for x86
 340 ifeq ($(ARCH),i386)
 341         SRCARCH := x86
 342 endif
 343 ifeq ($(ARCH),x86_64)
 344         SRCARCH := x86
 345 endif
 346
 347 # Additional ARCH settings for sparc
 348 ifeq ($(ARCH),sparc32)
 349        SRCARCH := sparc
 350 endif
 351 ifeq ($(ARCH),sparc64)
 352        SRCARCH := sparc
 353 endif
 354
 355 # Additional ARCH settings for sh
 356 ifeq ($(ARCH),sh64)
 357        SRCARCH := sh
 358 endif
 359
 360 KCONFIG_CONFIG  ?= .config
 361 export KCONFIG_CONFIG
 362
 363 # SHELL used by kbuild
 364 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 365           else if [ -x /bin/bash ]; then echo /bin/bash; \
 366           else echo sh; fi ; fi)
 367
 368 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 369 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 370 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 371
 372 HOSTCC       = gcc
 373 HOSTCXX      = g++
 374 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 375                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 376 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 377 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 378 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 379
 380 # Make variables (CC, etc...)
 381 AS              = $(CROSS_COMPILE)as
 382 LD              = $(CROSS_COMPILE)ld
 383 CC              = $(CROSS_COMPILE)gcc
 384 CPP             = $(CC) -E
 385 AR              = $(CROSS_COMPILE)ar
 386 NM              = $(CROSS_COMPILE)nm
 387 STRIP           = $(CROSS_COMPILE)strip
 388 OBJCOPY         = $(CROSS_COMPILE)objcopy
 389 OBJDUMP         = $(CROSS_COMPILE)objdump
 390 LEX             = flex
 391 YACC            = bison
 392 AWK             = awk
 393 GENKSYMS        = scripts/genksyms/genksyms
 394 INSTALLKERNEL  := installkernel
 395 DEPMOD          = /sbin/depmod
 396 PERL            = perl
 397 PYTHON          = python
 398 PYTHON2         = python2
 399 PYTHON3         = python3
 400 CHECK           = sparse
 401
 402 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 403                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 404 NOSTDINC_FLAGS  =
 405 CFLAGS_MODULE   =
 406 AFLAGS_MODULE   =
 407 LDFLAGS_MODULE  =
 408 CFLAGS_KERNEL   =
 409 AFLAGS_KERNEL   =
 410 LDFLAGS_vmlinux =
 411
 412 # Use USERINCLUDE when you must reference the UAPI directories only.
 413 USERINCLUDE    := \
 414                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 415                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 416                 -I$(srctree)/include/uapi \
 417                 -I$(objtree)/include/generated/uapi \
 418                 -include $(srctree)/include/linux/kconfig.h
 419
 420 # Use LINUXINCLUDE when you must reference the include/ directory.
 421 # Needed to be compatible with the O= option
 422 LINUXINCLUDE    := \
 423                 -I$(srctree)/arch/$(SRCARCH)/include \
 424                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 425                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 426                 -I$(objtree)/include \
 427                 $(USERINCLUDE)
 428
 429 KBUILD_AFLAGS   := -D__ASSEMBLY__
 430 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 431                    -fno-strict-aliasing -fno-common -fshort-wchar \
 432                    -Werror-implicit-function-declaration \
 433                    -Wno-format-security \
 434                    -std=gnu89
 435 KBUILD_CPPFLAGS := -D__KERNEL__
 436 KBUILD_AFLAGS_KERNEL :=
 437 KBUILD_CFLAGS_KERNEL :=
 438 KBUILD_AFLAGS_MODULE  := -DMODULE
 439 KBUILD_CFLAGS_MODULE  := -DMODULE
 440 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 441 LDFLAGS :=
 442 GCC_PLUGINS_CFLAGS :=
 443
 444 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 445 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 446 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 447 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 448
 449 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 450 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 451 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 452 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 453 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 454 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 455 export KBUILD_ARFLAGS
 456
 457 # When compiling out-of-tree modules, put MODVERDIR in the module
 458 # tree rather than in the kernel tree. The kernel tree might
 459 # even be read-only.
 460 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 461
 462 # Files to ignore in find ... statements
 463
 464 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 465                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 466                           -prune -o
 467 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 468                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 469
 470 # ===========================================================================
 471 # Rules shared between *config targets and build targets
 472
 473 # Basic helpers built in scripts/basic/
 474 PHONY += scripts_basic
 475 scripts_basic:
 476         $(Q)$(MAKE) $(build)=scripts/basic
 477         $(Q)rm -f .tmp_quiet_recordmcount
 478
 479 # To avoid any implicit rule to kick in, define an empty command.
 480 scripts/basic/%: scripts_basic ;
 481
 482 PHONY += outputmakefile
 483 # outputmakefile generates a Makefile in the output directory, if using a
 484 # separate output directory. This allows convenient use of make in the
 485 # output directory.
 486 outputmakefile:
 487 ifneq ($(KBUILD_SRC),)
 488         $(Q)ln -fsn $(srctree) source
 489         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 490             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 491 endif
 492
 493 ifeq ($(cc-name),clang)
 494 ifneq ($(CROSS_COMPILE),)
 495 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 496 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 497 endif
 498 ifneq ($(GCC_TOOLCHAIN),)
 499 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 500 endif
 501 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 502 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 503 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 504 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 505 endif
 506
 507 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 508 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 509 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 510 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 511 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 512 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 513 export RETPOLINE_CFLAGS
 514 export RETPOLINE_VDSO_CFLAGS
 515
 516 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 517 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 518
 519 # check for 'asm goto'
 520 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 521   CC_HAVE_ASM_GOTO := 1
 522   KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 523   KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 524 endif
 525
 526 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 527 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 528 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 529 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 530 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 531
 532 ifeq ($(config-targets),1)
 533 # ===========================================================================
 534 # *config targets only - make sure prerequisites are updated, and descend
 535 # in scripts/kconfig to make the *config target
 536
 537 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 538 # KBUILD_DEFCONFIG may point out an alternative default configuration
 539 # used for 'make defconfig'
 540 include arch/$(SRCARCH)/Makefile
 541 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 542
 543 config: scripts_basic outputmakefile FORCE
 544         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 545
 546 %config: scripts_basic outputmakefile FORCE
 547         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 548
 549 else
 550 # ===========================================================================
 551 # Build targets only - this includes vmlinux, arch specific targets, clean
 552 # targets and others. In general all targets except *config targets.
 553
 554 # If building an external module we do not care about the all: rule
 555 # but instead _all depend on modules
 556 PHONY += all
 557 ifeq ($(KBUILD_EXTMOD),)
 558 _all: all
 559 else
 560 _all: modules
 561 endif
 562
 563 # Decide whether to build built-in, modular, or both.
 564 # Normally, just do built-in.
 565
 566 KBUILD_MODULES :=
 567 KBUILD_BUILTIN := 1
 568
 569 # If we have only "make modules", don't compile built-in objects.
 570 # When we're building modules with modversions, we need to consider
 571 # the built-in objects during the descend as well, in order to
 572 # make sure the checksums are up to date before we record them.
 573
 574 ifeq ($(MAKECMDGOALS),modules)
 575   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 576 endif
 577
 578 # If we have "make <whatever> modules", compile modules
 579 # in addition to whatever we do anyway.
 580 # Just "make" or "make all" shall build modules as well
 581
 582 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 583   KBUILD_MODULES := 1
 584 endif
 585
 586 ifeq ($(MAKECMDGOALS),)
 587   KBUILD_MODULES := 1
 588 endif
 589
 590 export KBUILD_MODULES KBUILD_BUILTIN
 591
 592 ifeq ($(KBUILD_EXTMOD),)
 593 # Objects we will link into vmlinux / subdirs we need to visit
 594 init-y          := init/
 595 drivers-y       := drivers/ sound/ firmware/
 596 net-y           := net/
 597 libs-y          := lib/
 598 core-y          := usr/
 599 virt-y          := virt/
 600 endif # KBUILD_EXTMOD
 601
 602 ifeq ($(dot-config),1)
 603 -include include/config/auto.conf
 604 endif
 605
 606 # The all: target is the default when no target is given on the
 607 # command line.
 608 # This allow a user to issue only 'make' to build a kernel including modules
 609 # Defaults to vmlinux, but the arch makefile usually adds further targets
 610 all: vmlinux
 611
 612 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 613         $(call cc-option,-fno-tree-loop-im) \
 614         $(call cc-disable-warning,maybe-uninitialized,)
 615 export CFLAGS_GCOV
 616
 617 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 618 # values of the respective KBUILD_* variables
 619 ARCH_CPPFLAGS :=
 620 ARCH_AFLAGS :=
 621 ARCH_CFLAGS :=
 622 include arch/$(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) include/config/auto.conf.cmd: ;
 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 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 638         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 639 else
 640 # External modules and some install targets need include/generated/autoconf.h
 641 # and include/config/auto.conf but do not care if they are up-to-date.
 642 # Use auto.conf to trigger the test
 643 PHONY += include/config/auto.conf
 644
 645 include/config/auto.conf:
 646         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 647         echo >&2;                                                       \
 648         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 649         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 650         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 651         echo >&2 ;                                                      \
 652         /bin/false)
 653
 654 endif # may-sync-config
 655
 656 else
 657 # Dummy target needed, because used as prerequisite
 658 include/config/auto.conf: ;
 659 endif # $(dot-config)
 660
 661 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 662 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 663 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 664 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 665 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 666
 667 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 668 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 669 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 670 else
 671 ifdef CONFIG_PROFILE_ALL_BRANCHES
 672 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 673 else
 674 KBUILD_CFLAGS   += -O2
 675 endif
 676 endif
 677
 678 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 679                         $(call cc-disable-warning,maybe-uninitialized,))
 680
 681 # Tell gcc to never replace conditional load with a non-conditional one
 682 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 683
 684 include scripts/Makefile.kcov
 685 include scripts/Makefile.gcc-plugins
 686
 687 ifdef CONFIG_READABLE_ASM
 688 # Disable optimizations that make assembler listings hard to read.
 689 # reorder blocks reorders the control in the function
 690 # ipa clone creates specialized cloned functions
 691 # partial inlining inlines only parts of functions
 692 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 693                  $(call cc-option,-fno-ipa-cp-clone,) \
 694                  $(call cc-option,-fno-partial-inlining)
 695 endif
 696
 697 ifneq ($(CONFIG_FRAME_WARN),0)
 698 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 699 endif
 700
 701 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 702 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 703 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 704
 705 KBUILD_CFLAGS += $(stackp-flags-y)
 706
 707 ifeq ($(cc-name),clang)
 708 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 709 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 710 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 711 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 712 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 713 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 714 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 715 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 716 # See modpost pattern 2
 717 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 718 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 719 else
 720
 721 # These warnings generated too much noise in a regular build.
 722 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 723 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 724 endif
 725
 726 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 727 ifdef CONFIG_FRAME_POINTER
 728 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 729 else
 730 # Some targets (ARM with Thumb2, for example), can't be built with frame
 731 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 732 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 733 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 734 # -fomit-frame-pointer with FUNCTION_TRACER.
 735 ifndef CONFIG_FUNCTION_TRACER
 736 KBUILD_CFLAGS   += -fomit-frame-pointer
 737 endif
 738 endif
 739
 740 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 741
 742 ifdef CONFIG_DEBUG_INFO
 743 ifdef CONFIG_DEBUG_INFO_SPLIT
 744 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 745 else
 746 KBUILD_CFLAGS   += -g
 747 endif
 748 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 749 endif
 750 ifdef CONFIG_DEBUG_INFO_DWARF4
 751 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 752 endif
 753
 754 ifdef CONFIG_DEBUG_INFO_REDUCED
 755 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 756                    $(call cc-option,-fno-var-tracking)
 757 endif
 758
 759 ifdef CONFIG_FUNCTION_TRACER
 760 ifndef CC_FLAGS_FTRACE
 761 CC_FLAGS_FTRACE := -pg
 762 endif
 763 export CC_FLAGS_FTRACE
 764 ifdef CONFIG_HAVE_FENTRY
 765 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 766 endif
 767 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 768 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 769 ifdef CONFIG_DYNAMIC_FTRACE
 770         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 771                 BUILD_C_RECORDMCOUNT := y
 772                 export BUILD_C_RECORDMCOUNT
 773         endif
 774 endif
 775 endif
 776
 777 # We trigger additional mismatches with less inlining
 778 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 779 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 780 endif
 781
 782 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 783 KBUILD_CFLAGS_KERNEL    += $(call cc-option,-ffunction-sections,)
 784 KBUILD_CFLAGS_KERNEL    += $(call cc-option,-fdata-sections,)
 785 endif
 786
 787 # arch Makefile may override CC so keep this after arch Makefile is included
 788 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 789
 790 # warn about C99 declaration after statement
 791 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 792
 793 # disable pointer signed / unsigned warnings in gcc 4.0
 794 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 795
 796 # disable invalid "can't wrap" optimizations for signed / pointers
 797 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 798
 799 # clang sets -fmerge-all-constants by default as optimization, but this
 800 # is non-conforming behavior for C and in fact breaks the kernel, so we
 801 # need to disable it here generally.
 802 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 803
 804 # for gcc -fno-merge-all-constants disables everything, but it is fine
 805 # to have actual conforming behavior enabled.
 806 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 807
 808 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 809 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 810
 811 # conserve stack if available
 812 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 813
 814 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 815 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 816
 817 # require functions to have arguments in prototypes, not empty 'int foo()'
 818 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 819
 820 # Prohibit date/time macros, which would make the build non-deterministic
 821 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 822
 823 # enforce correct pointer usage
 824 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 825
 826 # Require designated initializers for all marked structures
 827 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 828
 829 # change __FILE__ to the relative path from the srctree
 830 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 831
 832 # use the deterministic mode of AR if available
 833 KBUILD_ARFLAGS := $(call ar-option,D)
 834
 835 include scripts/Makefile.kasan
 836 include scripts/Makefile.extrawarn
 837 include scripts/Makefile.ubsan
 838
 839 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 840 # last assignments
 841 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 842 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 843 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 844
 845 # Use --build-id when available.
 846 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 847 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 848 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 849
 850 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 851 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 852 endif
 853
 854 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 855 LDFLAGS_vmlinux += $(call ld-option, -X,)
 856 endif
 857
 858 # insure the checker run with the right endianness
 859 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 860
 861 # the checker needs the correct machine size
 862 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 863
 864 # Default kernel image to build when no specific target is given.
 865 # KBUILD_IMAGE may be overruled on the command line or
 866 # set in the environment
 867 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 868 # this default value
 869 export KBUILD_IMAGE ?= vmlinux
 870
 871 #
 872 # INSTALL_PATH specifies where to place the updated kernel and system map
 873 # images. Default is /boot, but you can set it to other values
 874 export  INSTALL_PATH ?= /boot
 875
 876 #
 877 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 878 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 879 # an argument if needed. Otherwise it defaults to the kernel install path
 880 #
 881 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 882
 883 #
 884 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 885 # relocations required by build roots.  This is not defined in the
 886 # makefile but the argument can be passed to make if needed.
 887 #
 888
 889 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 890 export MODLIB
 891
 892 #
 893 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 894 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 895 # the default option --strip-debug will be used.  Otherwise,
 896 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 897
 898 ifdef INSTALL_MOD_STRIP
 899 ifeq ($(INSTALL_MOD_STRIP),1)
 900 mod_strip_cmd = $(STRIP) --strip-debug
 901 else
 902 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 903 endif # INSTALL_MOD_STRIP=1
 904 else
 905 mod_strip_cmd = true
 906 endif # INSTALL_MOD_STRIP
 907 export mod_strip_cmd
 908
 909 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 910 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 911 # or CONFIG_MODULE_COMPRESS_XZ.
 912
 913 mod_compress_cmd = true
 914 ifdef CONFIG_MODULE_COMPRESS
 915   ifdef CONFIG_MODULE_COMPRESS_GZIP
 916     mod_compress_cmd = gzip -n -f
 917   endif # CONFIG_MODULE_COMPRESS_GZIP
 918   ifdef CONFIG_MODULE_COMPRESS_XZ
 919     mod_compress_cmd = xz -f
 920   endif # CONFIG_MODULE_COMPRESS_XZ
 921 endif # CONFIG_MODULE_COMPRESS
 922 export mod_compress_cmd
 923
 924 # Select initial ramdisk compression format, default is gzip(1).
 925 # This shall be used by the dracut(8) tool while creating an initramfs image.
 926 #
 927 INITRD_COMPRESS-y                  := gzip
 928 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 929 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 930 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 931 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 932 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 933 # do not export INITRD_COMPRESS, since we didn't actually
 934 # choose a sane default compression above.
 935 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 936
 937 ifdef CONFIG_MODULE_SIG_ALL
 938 $(eval $(call config_filename,MODULE_SIG_KEY))
 939
 940 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 941 else
 942 mod_sign_cmd = true
 943 endif
 944 export mod_sign_cmd
 945
 946 ifdef CONFIG_STACK_VALIDATION
 947   has_libelf := $(call try-run,\
 948                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 949   ifeq ($(has_libelf),1)
 950     objtool_target := tools/objtool FORCE
 951   else
 952     ifdef CONFIG_UNWINDER_ORC
 953       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 954     else
 955       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 956     endif
 957     SKIP_STACK_VALIDATION := 1
 958     export SKIP_STACK_VALIDATION
 959   endif
 960 endif
 961
 962
 963 ifeq ($(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) $(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
1030 ifdef CONFIG_SAMPLES
1031 vmlinux-dirs += samples
1032 endif
1033
1034 # The actual objects are generated when descending,
1035 # make sure no implicit rule kicks in
1036 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1037
1038 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1039 # Preset locale variables to speed up the build process. Limit locale
1040 # tweaks to this spot to avoid wrong language settings when running
1041 # make menuconfig etc.
1042 # Error messages still appears in the original language
1043
1044 PHONY += $(vmlinux-dirs)
1045 $(vmlinux-dirs): prepare scripts
1046         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1047
1048 define filechk_kernel.release
1049         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1050 endef
1051
1052 # Store (new) KERNELRELEASE string in include/config/kernel.release
1053 include/config/kernel.release: include/config/auto.conf FORCE
1054         $(call filechk,kernel.release)
1055
1056 # Additional helpers built in scripts/
1057 # Carefully list dependencies so we do not try to build scripts twice
1058 # in parallel
1059 PHONY += scripts
1060 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
1061          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                    include/config/auto.conf
1093         $(cmd_crmodverdir)
1094
1095 archprepare: archheaders archscripts prepare1 scripts_basic
1096
1097 prepare0: archprepare gcc-plugins
1098         $(Q)$(MAKE) $(build)=.
1099
1100 # All the preparing..
1101 prepare: prepare0 prepare-objtool
1102
1103 # Support for using generic headers in asm-generic
1104 PHONY += asm-generic uapi-asm-generic
1105 asm-generic: uapi-asm-generic
1106         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1107                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1108 uapi-asm-generic:
1109         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1110                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1111
1112 PHONY += prepare-objtool
1113 prepare-objtool: $(objtool_target)
1114
1115 # Generate some files
1116 # ---------------------------------------------------------------------------
1117
1118 # KERNELRELEASE can change from a few different places, meaning version.h
1119 # needs to be updated, so this check is forced on all builds
1120
1121 uts_len := 64
1122 define filechk_utsrelease.h
1123         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1124           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1125           exit 1;                                                         \
1126         fi;                                                               \
1127         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1128 endef
1129
1130 define filechk_version.h
1131         (echo \#define LINUX_VERSION_CODE $(shell                         \
1132         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1133         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1134 endef
1135
1136 $(version_h): $(srctree)/Makefile FORCE
1137         $(call filechk,version.h)
1138         $(Q)rm -f $(old_version_h)
1139
1140 include/generated/utsrelease.h: include/config/kernel.release FORCE
1141         $(call filechk,utsrelease.h)
1142
1143 PHONY += headerdep
1144 headerdep:
1145         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1146         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1147
1148 # ---------------------------------------------------------------------------
1149 # Kernel headers
1150
1151 #Default location for installed headers
1152 export INSTALL_HDR_PATH = $(objtree)/usr
1153
1154 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1155 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1156
1157 PHONY += archheaders
1158 archheaders:
1159
1160 PHONY += archscripts
1161 archscripts:
1162
1163 PHONY += __headers
1164 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1165         $(Q)$(MAKE) $(build)=scripts build_unifdef
1166
1167 PHONY += headers_install_all
1168 headers_install_all:
1169         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1170
1171 PHONY += headers_install
1172 headers_install: __headers
1173         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1174           $(error Headers not exportable for the $(SRCARCH) architecture))
1175         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1176         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1177
1178 PHONY += headers_check_all
1179 headers_check_all: headers_install_all
1180         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1181
1182 PHONY += headers_check
1183 headers_check: headers_install
1184         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1185         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1186
1187 # ---------------------------------------------------------------------------
1188 # Kernel selftest
1189
1190 PHONY += kselftest
1191 kselftest:
1192         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1193
1194 PHONY += kselftest-clean
1195 kselftest-clean:
1196         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1197
1198 PHONY += kselftest-merge
1199 kselftest-merge:
1200         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1201         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1202                 -m $(objtree)/.config \
1203                 $(srctree)/tools/testing/selftests/*/config
1204         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1205
1206 # ---------------------------------------------------------------------------
1207 # Modules
1208
1209 ifdef CONFIG_MODULES
1210
1211 # By default, build modules as well
1212
1213 all: modules
1214
1215 # Build modules
1216 #
1217 # A module can be listed more than once in obj-m resulting in
1218 # duplicate lines in modules.order files.  Those are removed
1219 # using awk while concatenating to the final file.
1220
1221 PHONY += modules
1222 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1223         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1224         @$(kecho) '  Building modules, stage 2.';
1225         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1226
1227 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1228         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1229
1230 %/modules.builtin: include/config/auto.conf
1231         $(Q)$(MAKE) $(modbuiltin)=$*
1232
1233
1234 # Target to prepare building external modules
1235 PHONY += modules_prepare
1236 modules_prepare: prepare scripts
1237
1238 # Target to install modules
1239 PHONY += modules_install
1240 modules_install: _modinst_ _modinst_post
1241
1242 PHONY += _modinst_
1243 _modinst_:
1244         @rm -rf $(MODLIB)/kernel
1245         @rm -f $(MODLIB)/source
1246         @mkdir -p $(MODLIB)/kernel
1247         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1248         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1249                 rm -f $(MODLIB)/build ; \
1250                 ln -s $(CURDIR) $(MODLIB)/build ; \
1251         fi
1252         @cp -f $(objtree)/modules.order $(MODLIB)/
1253         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1254         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1255
1256 # This depmod is only for convenience to give the initial
1257 # boot a modules.dep even before / is mounted read-write.  However the
1258 # boot script depmod is the master version.
1259 PHONY += _modinst_post
1260 _modinst_post: _modinst_
1261         $(call cmd,depmod)
1262
1263 ifeq ($(CONFIG_MODULE_SIG), y)
1264 PHONY += modules_sign
1265 modules_sign:
1266         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1267 endif
1268
1269 else # CONFIG_MODULES
1270
1271 # Modules not configured
1272 # ---------------------------------------------------------------------------
1273
1274 PHONY += modules modules_install
1275 modules modules_install:
1276         @echo >&2
1277         @echo >&2 "The present kernel configuration has modules disabled."
1278         @echo >&2 "Type 'make config' and enable loadable module support."
1279         @echo >&2 "Then build a kernel with module support enabled."
1280         @echo >&2
1281         @exit 1
1282
1283 endif # CONFIG_MODULES
1284
1285 ###
1286 # Cleaning is done on three levels.
1287 # make clean     Delete most generated files
1288 #                Leave enough to build external modules
1289 # make mrproper  Delete the current configuration, and all generated files
1290 # make distclean Remove editor backup files, patch leftover files and the like
1291
1292 # Directories & files removed with 'make clean'
1293 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1294
1295 # Directories & files removed with 'make mrproper'
1296 MRPROPER_DIRS  += include/config usr/include include/generated          \
1297                   arch/*/include/generated .tmp_objdiff
1298 MRPROPER_FILES += .config .config.old .version \
1299                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1300                   signing_key.pem signing_key.priv signing_key.x509     \
1301                   x509.genkey extra_certificates signing_key.x509.keyid \
1302                   signing_key.x509.signer vmlinux-gdb.py
1303
1304 # clean - Delete most, but leave enough to build external modules
1305 #
1306 clean: rm-dirs  := $(CLEAN_DIRS)
1307 clean: rm-files := $(CLEAN_FILES)
1308 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1309
1310 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1311 $(clean-dirs):
1312         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1313
1314 vmlinuxclean:
1315         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1316         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1317
1318 clean: archclean vmlinuxclean
1319
1320 # mrproper - Delete all generated files, including .config
1321 #
1322 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1323 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1324 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1325
1326 PHONY += $(mrproper-dirs) mrproper archmrproper
1327 $(mrproper-dirs):
1328         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1329
1330 mrproper: clean archmrproper $(mrproper-dirs)
1331         $(call cmd,rmdirs)
1332         $(call cmd,rmfiles)
1333
1334 # distclean
1335 #
1336 PHONY += distclean
1337
1338 distclean: mrproper
1339         @find $(srctree) $(RCS_FIND_IGNORE) \
1340                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1341                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1342                 -o -name 'core' \) \
1343                 -type f -print | xargs rm -f
1344
1345
1346 # Packaging of the kernel to various formats
1347 # ---------------------------------------------------------------------------
1348 # rpm target kept for backward compatibility
1349 package-dir     := scripts/package
1350
1351 %src-pkg: FORCE
1352         $(Q)$(MAKE) $(build)=$(package-dir) $@
1353 %pkg: include/config/kernel.release FORCE
1354         $(Q)$(MAKE) $(build)=$(package-dir) $@
1355 rpm: rpm-pkg
1356         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1357         @echo "           Please use \"rpm-pkg\" instead."
1358
1359
1360 # Brief documentation of the typical targets used
1361 # ---------------------------------------------------------------------------
1362
1363 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1364 boards := $(sort $(notdir $(boards)))
1365 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1366 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1367
1368 PHONY += help
1369 help:
1370         @echo  'Cleaning targets:'
1371         @echo  '  clean           - Remove most generated files but keep the config and'
1372         @echo  '                    enough build support to build external modules'
1373         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1374         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1375         @echo  ''
1376         @echo  'Configuration targets:'
1377         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1378         @echo  ''
1379         @echo  'Other generic targets:'
1380         @echo  '  all             - Build all targets marked with [*]'
1381         @echo  '* vmlinux         - Build the bare kernel'
1382         @echo  '* modules         - Build all modules'
1383         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1384         @echo  '  dir/            - Build all files in dir and below'
1385         @echo  '  dir/file.[ois]  - Build specified target only'
1386         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1387         @echo  '                    (requires compiler support for LLVM assembly generation)'
1388         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1389         @echo  '                    (requires a recent binutils and recent build (System.map))'
1390         @echo  '  dir/file.ko     - Build module including final link'
1391         @echo  '  modules_prepare - Set up for building external modules'
1392         @echo  '  tags/TAGS       - Generate tags file for editors'
1393         @echo  '  cscope          - Generate cscope index'
1394         @echo  '  gtags           - Generate GNU GLOBAL index'
1395         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1396         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1397         @echo  '  image_name      - Output the image name (use with make -s)'
1398         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1399          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1400          echo  ''
1401         @echo  'Static analysers:'
1402         @echo  '  checkstack      - Generate a list of stack hogs'
1403         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1404         @echo  '  versioncheck    - Sanity check on version.h usage'
1405         @echo  '  includecheck    - Check for duplicate included header files'
1406         @echo  '  export_report   - List the usages of all exported symbols'
1407         @echo  '  headers_check   - Sanity check on exported headers'
1408         @echo  '  headerdep       - Detect inclusion cycles in headers'
1409         @echo  '  coccicheck      - Check with Coccinelle'
1410         @echo  ''
1411         @echo  'Kernel selftest:'
1412         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1413         @echo  '                    Build, install, and boot kernel before'
1414         @echo  '                    running kselftest on it'
1415         @echo  '  kselftest-clean - Remove all generated kselftest files'
1416         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1417         @echo  '                    .config.'
1418         @echo  ''
1419         @echo 'Userspace tools targets:'
1420         @echo '  use "make tools/help"'
1421         @echo '  or  "cd tools; make help"'
1422         @echo  ''
1423         @echo  'Kernel packaging:'
1424         @$(MAKE) $(build)=$(package-dir) help
1425         @echo  ''
1426         @echo  'Documentation targets:'
1427         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1428         @echo  ''
1429         @echo  'Architecture specific targets ($(SRCARCH)):'
1430         @$(if $(archhelp),$(archhelp),\
1431                 echo '  No architecture specific help defined for $(SRCARCH)')
1432         @echo  ''
1433         @$(if $(boards), \
1434                 $(foreach b, $(boards), \
1435                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1436                 echo '')
1437         @$(if $(board-dirs), \
1438                 $(foreach b, $(board-dirs), \
1439                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1440                 printf "  %-16s - Show all of the above\\n" help-boards; \
1441                 echo '')
1442
1443         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1444         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1445         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1446         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1447         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1448         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1449         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1450         @echo  '                1: warnings which may be relevant and do not occur too often'
1451         @echo  '                2: warnings which occur quite often but may still be relevant'
1452         @echo  '                3: more obscure warnings, can most likely be ignored'
1453         @echo  '                Multiple levels can be combined with W=12 or W=123'
1454         @echo  ''
1455         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1456         @echo  'For further info see the ./README file'
1457
1458
1459 help-board-dirs := $(addprefix help-,$(board-dirs))
1460
1461 help-boards: $(help-board-dirs)
1462
1463 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1464
1465 $(help-board-dirs): help-%:
1466         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1467         @$(if $(boards-per-dir), \
1468                 $(foreach b, $(boards-per-dir), \
1469                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1470                 echo '')
1471
1472
1473 # Documentation targets
1474 # ---------------------------------------------------------------------------
1475 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1476                linkcheckdocs dochelp refcheckdocs
1477 PHONY += $(DOC_TARGETS)
1478 $(DOC_TARGETS): scripts_basic FORCE
1479         $(Q)$(MAKE) $(build)=Documentation $@
1480
1481 else # KBUILD_EXTMOD
1482
1483 ###
1484 # External module support.
1485 # When building external modules the kernel used as basis is considered
1486 # read-only, and no consistency checks are made and the make
1487 # system is not used on the basis kernel. If updates are required
1488 # in the basis kernel ordinary make commands (without M=...) must
1489 # be used.
1490 #
1491 # The following are the only valid targets when building external
1492 # modules.
1493 # make M=dir clean     Delete all automatically generated files
1494 # make M=dir modules   Make all modules in specified dir
1495 # make M=dir           Same as 'make M=dir modules'
1496 # make M=dir modules_install
1497 #                      Install the modules built in the module directory
1498 #                      Assumes install directory is already created
1499
1500 # We are always building modules
1501 KBUILD_MODULES := 1
1502 PHONY += crmodverdir
1503 crmodverdir:
1504         $(cmd_crmodverdir)
1505
1506 PHONY += $(objtree)/Module.symvers
1507 $(objtree)/Module.symvers:
1508         @test -e $(objtree)/Module.symvers || ( \
1509         echo; \
1510         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1511         echo "           is missing; modules will have no dependencies and modversions."; \
1512         echo )
1513
1514 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1515 PHONY += $(module-dirs) modules
1516 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1517         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1518
1519 modules: $(module-dirs)
1520         @$(kecho) '  Building modules, stage 2.';
1521         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1522
1523 PHONY += modules_install
1524 modules_install: _emodinst_ _emodinst_post
1525
1526 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1527 PHONY += _emodinst_
1528 _emodinst_:
1529         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1530         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1531
1532 PHONY += _emodinst_post
1533 _emodinst_post: _emodinst_
1534         $(call cmd,depmod)
1535
1536 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1537
1538 PHONY += $(clean-dirs) clean
1539 $(clean-dirs):
1540         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1541
1542 clean:  rm-dirs := $(MODVERDIR)
1543 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1544
1545 PHONY += help
1546 help:
1547         @echo  '  Building external modules.'
1548         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1549         @echo  ''
1550         @echo  '  modules         - default target, build the module(s)'
1551         @echo  '  modules_install - install the module'
1552         @echo  '  clean           - remove generated files in module directory only'
1553         @echo  ''
1554
1555 # Dummies...
1556 PHONY += prepare scripts
1557 prepare: ;
1558 scripts: ;
1559 endif # KBUILD_EXTMOD
1560
1561 clean: $(clean-dirs)
1562         $(call cmd,rmdirs)
1563         $(call cmd,rmfiles)
1564         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1565                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1566                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1567                 -o -name '*.dwo' -o -name '*.lst' \
1568                 -o -name '*.su'  \
1569                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1570                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1571                 -o -name '*.asn1.[ch]' \
1572                 -o -name '*.symtypes' -o -name 'modules.order' \
1573                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1574                 -o -name '*.c.[012]*.*' \
1575                 -o -name '*.ll' \
1576                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1577
1578 # Generate tags for editors
1579 # ---------------------------------------------------------------------------
1580 quiet_cmd_tags = GEN     $@
1581       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1582
1583 tags TAGS cscope gtags: FORCE
1584         $(call cmd,tags)
1585
1586 # Scripts to check various things for consistency
1587 # ---------------------------------------------------------------------------
1588
1589 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1590
1591 includecheck:
1592         find $(srctree)/* $(RCS_FIND_IGNORE) \
1593                 -name '*.[hcS]' -type f -print | sort \
1594                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1595
1596 versioncheck:
1597         find $(srctree)/* $(RCS_FIND_IGNORE) \
1598                 -name '*.[hcS]' -type f -print | sort \
1599                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1600
1601 coccicheck:
1602         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1603
1604 namespacecheck:
1605         $(PERL) $(srctree)/scripts/namespace.pl
1606
1607 export_report:
1608         $(PERL) $(srctree)/scripts/export_report.pl
1609
1610 endif #ifeq ($(config-targets),1)
1611 endif #ifeq ($(mixed-targets),1)
1612
1613 PHONY += checkstack kernelrelease kernelversion image_name
1614
1615 # UML needs a little special treatment here.  It wants to use the host
1616 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1617 # else wants $(ARCH), including people doing cross-builds, which means
1618 # that $(SUBARCH) doesn't work here.
1619 ifeq ($(ARCH), um)
1620 CHECKSTACK_ARCH := $(SUBARCH)
1621 else
1622 CHECKSTACK_ARCH := $(ARCH)
1623 endif
1624 checkstack:
1625         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1626         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1627
1628 kernelrelease:
1629         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1630
1631 kernelversion:
1632         @echo $(KERNELVERSION)
1633
1634 image_name:
1635         @echo $(KBUILD_IMAGE)
1636
1637 # Clear a bunch of variables before executing the submake
1638 tools/: FORCE
1639         $(Q)mkdir -p $(objtree)/tools
1640         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1641
1642 tools/%: FORCE
1643         $(Q)mkdir -p $(objtree)/tools
1644         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1645
1646 # Single targets
1647 # ---------------------------------------------------------------------------
1648 # Single targets are compatible with:
1649 # - build with mixed source and output
1650 # - build with separate output dir 'make O=...'
1651 # - external modules
1652 #
1653 #  target-dir => where to store outputfile
1654 #  build-dir  => directory in kernel source tree to use
1655
1656 ifeq ($(KBUILD_EXTMOD),)
1657         build-dir  = $(patsubst %/,%,$(dir $@))
1658         target-dir = $(dir $@)
1659 else
1660         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1661         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1662         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1663 endif
1664
1665 %.s: %.c prepare scripts FORCE
1666         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1667 %.i: %.c prepare scripts FORCE
1668         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1669 %.o: %.c prepare scripts FORCE
1670         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1671 %.lst: %.c prepare scripts FORCE
1672         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1673 %.s: %.S prepare scripts FORCE
1674         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1675 %.o: %.S prepare scripts FORCE
1676         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1677 %.symtypes: %.c prepare scripts FORCE
1678         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1679 %.ll: %.c prepare scripts FORCE
1680         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1681
1682 # Modules
1683 /: prepare scripts FORCE
1684         $(cmd_crmodverdir)
1685         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1686         $(build)=$(build-dir)
1687 # Make sure the latest headers are built for Documentation
1688 Documentation/ samples/: headers_install
1689 %/: prepare scripts FORCE
1690         $(cmd_crmodverdir)
1691         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1692         $(build)=$(build-dir)
1693 %.ko: prepare scripts FORCE
1694         $(cmd_crmodverdir)
1695         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1696         $(build)=$(build-dir) $(@:.ko=.o)
1697         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1698
1699 # FIXME Should go into a make.lib or something
1700 # ===========================================================================
1701
1702 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1703       cmd_rmdirs = rm -rf $(rm-dirs)
1704
1705 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1706       cmd_rmfiles = rm -f $(rm-files)
1707
1708 # Run depmod only if we have System.map and depmod is executable
1709 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1710       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1711                    $(KERNELRELEASE)
1712
1713 # Create temporary dir for module support files
1714 # clean it up only when building all modules
1715 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1716                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1717
1718 # read all saved command lines
1719
1720 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1721
1722 ifneq ($(cmd_files),)
1723   $(cmd_files): ;       # Do not try to update included dependency files
1724   include $(cmd_files)
1725 endif
1726
1727 endif   # skip-makefile
1728
1729 PHONY += FORCE
1730 FORCE:
1731
1732 # Declare the contents of the PHONY variable as phony.  We keep that
1733 # information in a variable so we can use it in if_changed and friends.
1734 .PHONY: $(PHONY)