Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 14
   4 SUBLEVEL = 180
   5 EXTRAVERSION =
   6 NAME = Petit Gorille
   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.o 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                                                                 && /bin/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 no-dot-config-targets := clean mrproper distclean \
 224                          cscope gtags TAGS tags help% %docs check% coccicheck \
 225                          $(version_h) headers_% archheaders archscripts \
 226                          kernelversion %src-pkg
 227
 228 config-targets := 0
 229 mixed-targets  := 0
 230 dot-config     := 1
 231
 232 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 233         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 234                 dot-config := 0
 235         endif
 236 endif
 237
 238 ifeq ($(KBUILD_EXTMOD),)
 239         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 240                 config-targets := 1
 241                 ifneq ($(words $(MAKECMDGOALS)),1)
 242                         mixed-targets := 1
 243                 endif
 244         endif
 245 endif
 246 # install and modules_install need also be processed one by one
 247 ifneq ($(filter install,$(MAKECMDGOALS)),)
 248         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 249                 mixed-targets := 1
 250         endif
 251 endif
 252
 253 ifeq ($(mixed-targets),1)
 254 # ===========================================================================
 255 # We're called with mixed targets (*config and build targets).
 256 # Handle them one by one.
 257
 258 PHONY += $(MAKECMDGOALS) __build_one_by_one
 259
 260 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 261         @:
 262
 263 __build_one_by_one:
 264         $(Q)set -e; \
 265         for i in $(MAKECMDGOALS); do \
 266                 $(MAKE) -f $(srctree)/Makefile $$i; \
 267         done
 268
 269 else
 270
 271 # We need some generic definitions (do not try to remake the file).
 272 scripts/Kbuild.include: ;
 273 include scripts/Kbuild.include
 274
 275 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 276 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 277 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 278 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 279
 280 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 281 # first, and if a usermode build is happening, the "ARCH=um" on the command
 282 # line overrides the setting of ARCH below.  If a native build is happening,
 283 # then ARCH is assigned, getting whatever value it gets normally, and
 284 # SUBARCH is subsequently ignored.
 285
 286 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 287                                   -e s/sun4u/sparc64/ \
 288                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 289                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 290                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 291                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 292
 293 # Cross compiling and selecting different set of gcc/bin-utils
 294 # ---------------------------------------------------------------------------
 295 #
 296 # When performing cross compilation for other architectures ARCH shall be set
 297 # to the target architecture. (See arch/* for the possibilities).
 298 # ARCH can be set during invocation of make:
 299 # make ARCH=ia64
 300 # Another way is to have ARCH set in the environment.
 301 # The default ARCH is the host where make is executed.
 302
 303 # CROSS_COMPILE specify the prefix used for all executables used
 304 # during compilation. Only gcc and related bin-utils executables
 305 # are prefixed with $(CROSS_COMPILE).
 306 # CROSS_COMPILE can be set on the command line
 307 # make CROSS_COMPILE=ia64-linux-
 308 # Alternatively CROSS_COMPILE can be set in the environment.
 309 # A third alternative is to store a setting in .config so that plain
 310 # "make" in the configured kernel build directory always uses that.
 311 # Default value for CROSS_COMPILE is not to prefix executables
 312 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 313 ARCH            ?= $(SUBARCH)
 314 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 315
 316 # Architecture as present in compile.h
 317 UTS_MACHINE     := $(ARCH)
 318 SRCARCH         := $(ARCH)
 319
 320 # Additional ARCH settings for x86
 321 ifeq ($(ARCH),i386)
 322         SRCARCH := x86
 323 endif
 324 ifeq ($(ARCH),x86_64)
 325         SRCARCH := x86
 326 endif
 327
 328 # Additional ARCH settings for sparc
 329 ifeq ($(ARCH),sparc32)
 330        SRCARCH := sparc
 331 endif
 332 ifeq ($(ARCH),sparc64)
 333        SRCARCH := sparc
 334 endif
 335
 336 # Additional ARCH settings for sh
 337 ifeq ($(ARCH),sh64)
 338        SRCARCH := sh
 339 endif
 340
 341 # Additional ARCH settings for tile
 342 ifeq ($(ARCH),tilepro)
 343        SRCARCH := tile
 344 endif
 345 ifeq ($(ARCH),tilegx)
 346        SRCARCH := tile
 347 endif
 348
 349 # Where to locate arch specific headers
 350 hdr-arch  := $(SRCARCH)
 351
 352 KCONFIG_CONFIG  ?= .config
 353 export KCONFIG_CONFIG
 354
 355 # SHELL used by kbuild
 356 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 357           else if [ -x /bin/bash ]; then echo /bin/bash; \
 358           else echo sh; fi ; fi)
 359
 360 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 361 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 362 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 363
 364 HOSTCC       = gcc
 365 HOSTCXX      = g++
 366 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 367                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 368 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 369 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 370 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 371
 372 # Make variables (CC, etc...)
 373 AS              = $(CROSS_COMPILE)as
 374 LD              = $(CROSS_COMPILE)ld
 375 CC              = $(CROSS_COMPILE)gcc
 376 CPP             = $(CC) -E
 377 AR              = $(CROSS_COMPILE)ar
 378 NM              = $(CROSS_COMPILE)nm
 379 STRIP           = $(CROSS_COMPILE)strip
 380 OBJCOPY         = $(CROSS_COMPILE)objcopy
 381 OBJDUMP         = $(CROSS_COMPILE)objdump
 382 AWK             = awk
 383 GENKSYMS        = scripts/genksyms/genksyms
 384 INSTALLKERNEL  := installkernel
 385 DEPMOD          = /sbin/depmod
 386 PERL            = perl
 387 PYTHON          = python
 388 CHECK           = sparse
 389
 390 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 391                   -Wbitwise -Wno-return-void $(CF)
 392 NOSTDINC_FLAGS  =
 393 CFLAGS_MODULE   =
 394 AFLAGS_MODULE   =
 395 LDFLAGS_MODULE  =
 396 CFLAGS_KERNEL   =
 397 AFLAGS_KERNEL   =
 398 LDFLAGS_vmlinux =
 399
 400 # Use USERINCLUDE when you must reference the UAPI directories only.
 401 USERINCLUDE    := \
 402                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 403                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 404                 -I$(srctree)/include/uapi \
 405                 -I$(objtree)/include/generated/uapi \
 406                 -include $(srctree)/include/linux/kconfig.h
 407
 408 # Use LINUXINCLUDE when you must reference the include/ directory.
 409 # Needed to be compatible with the O= option
 410 LINUXINCLUDE    := \
 411                 -I$(srctree)/arch/$(hdr-arch)/include \
 412                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 413                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 414                 -I$(objtree)/include \
 415                 $(USERINCLUDE)
 416
 417 KBUILD_AFLAGS   := -D__ASSEMBLY__
 418 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 419                    -fno-strict-aliasing -fno-common -fshort-wchar \
 420                    -Werror-implicit-function-declaration \
 421                    -Wno-format-security \
 422                    -std=gnu89
 423 KBUILD_CPPFLAGS := -D__KERNEL__
 424 KBUILD_AFLAGS_KERNEL :=
 425 KBUILD_CFLAGS_KERNEL :=
 426 KBUILD_AFLAGS_MODULE  := -DMODULE
 427 KBUILD_CFLAGS_MODULE  := -DMODULE
 428 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 429 GCC_PLUGINS_CFLAGS :=
 430 CLANG_FLAGS :=
 431
 432 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 433 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 434 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 435 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 436
 437 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 438 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 439 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 440 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 441 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 442 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 443 export KBUILD_ARFLAGS
 444
 445 # When compiling out-of-tree modules, put MODVERDIR in the module
 446 # tree rather than in the kernel tree. The kernel tree might
 447 # even be read-only.
 448 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 449
 450 # Files to ignore in find ... statements
 451
 452 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 453                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 454                           -prune -o
 455 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 456                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 457
 458 # ===========================================================================
 459 # Rules shared between *config targets and build targets
 460
 461 # Basic helpers built in scripts/basic/
 462 PHONY += scripts_basic
 463 scripts_basic:
 464         $(Q)$(MAKE) $(build)=scripts/basic
 465         $(Q)rm -f .tmp_quiet_recordmcount
 466
 467 # To avoid any implicit rule to kick in, define an empty command.
 468 scripts/basic/%: scripts_basic ;
 469
 470 PHONY += outputmakefile
 471 # outputmakefile generates a Makefile in the output directory, if using a
 472 # separate output directory. This allows convenient use of make in the
 473 # output directory.
 474 outputmakefile:
 475 ifneq ($(KBUILD_SRC),)
 476         $(Q)ln -fsn $(srctree) source
 477         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 478             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 479 endif
 480
 481 ifeq ($(cc-name),clang)
 482 ifneq ($(CROSS_COMPILE),)
 483 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 484 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 485 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 486 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 487 endif
 488 ifneq ($(GCC_TOOLCHAIN),)
 489 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 490 endif
 491 CLANG_FLAGS     += -no-integrated-as
 492 CLANG_FLAGS     += -Werror=unknown-warning-option
 493 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 494 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 495 export CLANG_FLAGS
 496 endif
 497
 498 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 499 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 500 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 501 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 502 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 503 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 504 export RETPOLINE_CFLAGS
 505 export RETPOLINE_VDSO_CFLAGS
 506
 507 ifeq ($(config-targets),1)
 508 # ===========================================================================
 509 # *config targets only - make sure prerequisites are updated, and descend
 510 # in scripts/kconfig to make the *config target
 511
 512 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 513 # KBUILD_DEFCONFIG may point out an alternative default configuration
 514 # used for 'make defconfig'
 515 include arch/$(SRCARCH)/Makefile
 516 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 517
 518 config: scripts_basic outputmakefile FORCE
 519         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 520
 521 %config: scripts_basic outputmakefile FORCE
 522         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 523
 524 else
 525 # ===========================================================================
 526 # Build targets only - this includes vmlinux, arch specific targets, clean
 527 # targets and others. In general all targets except *config targets.
 528
 529 # If building an external module we do not care about the all: rule
 530 # but instead _all depend on modules
 531 PHONY += all
 532 ifeq ($(KBUILD_EXTMOD),)
 533 _all: all
 534 else
 535 _all: modules
 536 endif
 537
 538 # Decide whether to build built-in, modular, or both.
 539 # Normally, just do built-in.
 540
 541 KBUILD_MODULES :=
 542 KBUILD_BUILTIN := 1
 543
 544 # If we have only "make modules", don't compile built-in objects.
 545 # When we're building modules with modversions, we need to consider
 546 # the built-in objects during the descend as well, in order to
 547 # make sure the checksums are up to date before we record them.
 548
 549 ifeq ($(MAKECMDGOALS),modules)
 550   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 551 endif
 552
 553 # If we have "make <whatever> modules", compile modules
 554 # in addition to whatever we do anyway.
 555 # Just "make" or "make all" shall build modules as well
 556
 557 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 558   KBUILD_MODULES := 1
 559 endif
 560
 561 ifeq ($(MAKECMDGOALS),)
 562   KBUILD_MODULES := 1
 563 endif
 564
 565 export KBUILD_MODULES KBUILD_BUILTIN
 566
 567 ifeq ($(KBUILD_EXTMOD),)
 568 # Additional helpers built in scripts/
 569 # Carefully list dependencies so we do not try to build scripts twice
 570 # in parallel
 571 PHONY += scripts
 572 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 573          asm-generic gcc-plugins
 574         $(Q)$(MAKE) $(build)=$(@)
 575
 576 # Objects we will link into vmlinux / subdirs we need to visit
 577 init-y          := init/
 578 drivers-y       := drivers/ sound/ firmware/
 579 net-y           := net/
 580 libs-y          := lib/
 581 core-y          := usr/
 582 virt-y          := virt/
 583 endif # KBUILD_EXTMOD
 584
 585 ifeq ($(dot-config),1)
 586 # Read in config
 587 -include include/config/auto.conf
 588
 589 ifeq ($(KBUILD_EXTMOD),)
 590 # Read in dependencies to all Kconfig* files, make sure to run
 591 # oldconfig if changes are detected.
 592 -include include/config/auto.conf.cmd
 593
 594 # To avoid any implicit rule to kick in, define an empty command
 595 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 596
 597 # If .config is newer than include/config/auto.conf, someone tinkered
 598 # with it and forgot to run make oldconfig.
 599 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 600 # we execute the config step to be sure to catch updated Kconfig files
 601 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 602         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 603 else
 604 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 605 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 606 PHONY += include/config/auto.conf
 607
 608 include/config/auto.conf:
 609         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 610         echo >&2;                                                       \
 611         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 612         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 613         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 614         echo >&2 ;                                                      \
 615         /bin/false)
 616
 617 endif # KBUILD_EXTMOD
 618
 619 else
 620 # Dummy target needed, because used as prerequisite
 621 include/config/auto.conf: ;
 622 endif # $(dot-config)
 623
 624 # For the kernel to actually contain only the needed exported symbols,
 625 # we have to build modules as well to determine what those symbols are.
 626 # (this can be evaluated only once include/config/auto.conf has been included)
 627 ifdef CONFIG_TRIM_UNUSED_KSYMS
 628   KBUILD_MODULES := 1
 629 endif
 630
 631 # The all: target is the default when no target is given on the
 632 # command line.
 633 # This allow a user to issue only 'make' to build a kernel including modules
 634 # Defaults to vmlinux, but the arch makefile usually adds further targets
 635 all: vmlinux
 636
 637 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 638 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 639 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 640 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 641 export CFLAGS_GCOV CFLAGS_KCOV
 642
 643 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 644 # values of the respective KBUILD_* variables
 645 ARCH_CPPFLAGS :=
 646 ARCH_AFLAGS :=
 647 ARCH_CFLAGS :=
 648 include arch/$(SRCARCH)/Makefile
 649
 650 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 651 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 652 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 653 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 654 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 655 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 656 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 657
 658 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 659 KBUILD_CFLAGS   += -Os
 660 else
 661 KBUILD_CFLAGS   += -O2
 662 endif
 663
 664 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
 665 KBUILD_CFLAGS   += -Wno-maybe-uninitialized
 666 endif
 667
 668 # Tell gcc to never replace conditional load with a non-conditional one
 669 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 670
 671 # check for 'asm goto'
 672 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 673         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 674         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 675 endif
 676
 677 include scripts/Makefile.gcc-plugins
 678
 679 ifdef CONFIG_READABLE_ASM
 680 # Disable optimizations that make assembler listings hard to read.
 681 # reorder blocks reorders the control in the function
 682 # ipa clone creates specialized cloned functions
 683 # partial inlining inlines only parts of functions
 684 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 685                  $(call cc-option,-fno-ipa-cp-clone,) \
 686                  $(call cc-option,-fno-partial-inlining)
 687 endif
 688
 689 ifneq ($(CONFIG_FRAME_WARN),0)
 690 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 691 endif
 692
 693 # This selects the stack protector compiler flag. Testing it is delayed
 694 # until after .config has been reprocessed, in the prepare-compiler-check
 695 # target.
 696 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 697   stackp-flag := -fstack-protector
 698   stackp-name := REGULAR
 699 else
 700 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 701   stackp-flag := -fstack-protector-strong
 702   stackp-name := STRONG
 703 else
 704   # Force off for distro compilers that enable stack protector by default.
 705   stackp-flag := $(call cc-option, -fno-stack-protector)
 706 endif
 707 endif
 708 # Find arch-specific stack protector compiler sanity-checking script.
 709 ifdef CONFIG_CC_STACKPROTECTOR
 710   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 711   stackp-check := $(wildcard $(stackp-path))
 712 endif
 713 KBUILD_CFLAGS += $(stackp-flag)
 714
 715 ifeq ($(cc-name),clang)
 716 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 717 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 718 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 719 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 720 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 721 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 722 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 723 # See modpost pattern 2
 724 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 725 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 726 else
 727
 728 # These warnings generated too much noise in a regular build.
 729 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 730 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 731 endif
 732
 733 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 734 ifdef CONFIG_FRAME_POINTER
 735 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 736 else
 737 # Some targets (ARM with Thumb2, for example), can't be built with frame
 738 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 739 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 740 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 741 # -fomit-frame-pointer with FUNCTION_TRACER.
 742 ifndef CONFIG_FUNCTION_TRACER
 743 KBUILD_CFLAGS   += -fomit-frame-pointer
 744 endif
 745 endif
 746
 747 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 748
 749 ifdef CONFIG_DEBUG_INFO
 750 ifdef CONFIG_DEBUG_INFO_SPLIT
 751 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 752 else
 753 KBUILD_CFLAGS   += -g
 754 endif
 755 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 756 endif
 757 ifdef CONFIG_DEBUG_INFO_DWARF4
 758 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 759 endif
 760
 761 ifdef CONFIG_DEBUG_INFO_REDUCED
 762 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 763                    $(call cc-option,-fno-var-tracking)
 764 endif
 765
 766 ifdef CONFIG_FUNCTION_TRACER
 767 ifndef CC_FLAGS_FTRACE
 768 CC_FLAGS_FTRACE := -pg
 769 endif
 770 export CC_FLAGS_FTRACE
 771 ifdef CONFIG_HAVE_FENTRY
 772 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 773 endif
 774 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 775 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 776 ifdef CONFIG_DYNAMIC_FTRACE
 777         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 778                 BUILD_C_RECORDMCOUNT := y
 779                 export BUILD_C_RECORDMCOUNT
 780         endif
 781 endif
 782 endif
 783
 784 # We trigger additional mismatches with less inlining
 785 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 786 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 787 endif
 788
 789 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 790 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 791 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 792 endif
 793
 794 # arch Makefile may override CC so keep this after arch Makefile is included
 795 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 796 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 797
 798 # warn about C99 declaration after statement
 799 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 800
 801 # disable pointer signed / unsigned warnings in gcc 4.0
 802 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 803
 804 # disable stringop warnings in gcc 8+
 805 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 806
 807 # disable invalid "can't wrap" optimizations for signed / pointers
 808 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 809
 810 # clang sets -fmerge-all-constants by default as optimization, but this
 811 # is non-conforming behavior for C and in fact breaks the kernel, so we
 812 # need to disable it here generally.
 813 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 814
 815 # for gcc -fno-merge-all-constants disables everything, but it is fine
 816 # to have actual conforming behavior enabled.
 817 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 818
 819 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 820 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 821
 822 # conserve stack if available
 823 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 824
 825 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 826 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 827
 828 # require functions to have arguments in prototypes, not empty 'int foo()'
 829 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 830
 831 # Prohibit date/time macros, which would make the build non-deterministic
 832 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 833
 834 # enforce correct pointer usage
 835 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 836
 837 # Require designated initializers for all marked structures
 838 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 839
 840 # change __FILE__ to the relative path from the srctree
 841 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 842
 843 # ensure -fcf-protection is disabled when using retpoline as it is
 844 # incompatible with -mindirect-branch=thunk-extern
 845 ifdef CONFIG_RETPOLINE
 846 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 847 endif
 848
 849 # use the deterministic mode of AR if available
 850 KBUILD_ARFLAGS := $(call ar-option,D)
 851
 852 include scripts/Makefile.kasan
 853 include scripts/Makefile.extrawarn
 854 include scripts/Makefile.ubsan
 855
 856 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 857 # last assignments
 858 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 859 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 860 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 861
 862 # Use --build-id when available.
 863 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 864                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 865 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 866 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 867
 868 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 869 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 870 endif
 871
 872 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 873 LDFLAGS_vmlinux += $(call ld-option, -X,)
 874 endif
 875
 876 # Default kernel image to build when no specific target is given.
 877 # KBUILD_IMAGE may be overruled on the command line or
 878 # set in the environment
 879 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 880 # this default value
 881 export KBUILD_IMAGE ?= vmlinux
 882
 883 #
 884 # INSTALL_PATH specifies where to place the updated kernel and system map
 885 # images. Default is /boot, but you can set it to other values
 886 export  INSTALL_PATH ?= /boot
 887
 888 #
 889 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 890 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 891 # an argument if needed. Otherwise it defaults to the kernel install path
 892 #
 893 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 894
 895 #
 896 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 897 # relocations required by build roots.  This is not defined in the
 898 # makefile but the argument can be passed to make if needed.
 899 #
 900
 901 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 902 export MODLIB
 903
 904 #
 905 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 906 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 907 # the default option --strip-debug will be used.  Otherwise,
 908 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 909
 910 ifdef INSTALL_MOD_STRIP
 911 ifeq ($(INSTALL_MOD_STRIP),1)
 912 mod_strip_cmd = $(STRIP) --strip-debug
 913 else
 914 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 915 endif # INSTALL_MOD_STRIP=1
 916 else
 917 mod_strip_cmd = true
 918 endif # INSTALL_MOD_STRIP
 919 export mod_strip_cmd
 920
 921 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 922 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 923 # or CONFIG_MODULE_COMPRESS_XZ.
 924
 925 mod_compress_cmd = true
 926 ifdef CONFIG_MODULE_COMPRESS
 927   ifdef CONFIG_MODULE_COMPRESS_GZIP
 928     mod_compress_cmd = gzip -n -f
 929   endif # CONFIG_MODULE_COMPRESS_GZIP
 930   ifdef CONFIG_MODULE_COMPRESS_XZ
 931     mod_compress_cmd = xz -f
 932   endif # CONFIG_MODULE_COMPRESS_XZ
 933 endif # CONFIG_MODULE_COMPRESS
 934 export mod_compress_cmd
 935
 936 # Select initial ramdisk compression format, default is gzip(1).
 937 # This shall be used by the dracut(8) tool while creating an initramfs image.
 938 #
 939 INITRD_COMPRESS-y                  := gzip
 940 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 941 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 942 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 943 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 944 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 945 # do not export INITRD_COMPRESS, since we didn't actually
 946 # choose a sane default compression above.
 947 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 948
 949 ifdef CONFIG_MODULE_SIG_ALL
 950 $(eval $(call config_filename,MODULE_SIG_KEY))
 951
 952 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 953 else
 954 mod_sign_cmd = true
 955 endif
 956 export mod_sign_cmd
 957
 958 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 959
 960 ifdef CONFIG_STACK_VALIDATION
 961   has_libelf := $(call try-run,\
 962                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
 963   ifeq ($(has_libelf),1)
 964     objtool_target := tools/objtool FORCE
 965   else
 966     SKIP_STACK_VALIDATION := 1
 967     export SKIP_STACK_VALIDATION
 968   endif
 969 endif
 970
 971 PHONY += prepare0
 972
 973 ifeq ($(KBUILD_EXTMOD),)
 974 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 975
 976 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 977                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 978                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 979
 980 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 981                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 982
 983 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 984 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 985 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 986 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 987 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 988 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
 989 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 990
 991 # Externally visible symbols (used by link-vmlinux.sh)
 992 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 993 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 994 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 995 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 996 export LDFLAGS_vmlinux
 997 # used by scripts/package/Makefile
 998 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 999
1000 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1001
1002 # Include targets which we want to execute sequentially if the rest of the
1003 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1004 # evaluated more than once.
1005 PHONY += vmlinux_prereq
1006 vmlinux_prereq: $(vmlinux-deps) FORCE
1007 ifdef CONFIG_HEADERS_CHECK
1008         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1009 endif
1010 ifdef CONFIG_GDB_SCRIPTS
1011         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1012 endif
1013 ifdef CONFIG_TRIM_UNUSED_KSYMS
1014         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1015           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1016 endif
1017
1018 # standalone target for easier testing
1019 include/generated/autoksyms.h: FORCE
1020         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1021
1022 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1023
1024 # Final link of vmlinux with optional arch pass after final link
1025 cmd_link-vmlinux =                                                 \
1026         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1027         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1028
1029 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1030         +$(call if_changed,link-vmlinux)
1031
1032 # Build samples along the rest of the kernel
1033 ifdef CONFIG_SAMPLES
1034 vmlinux-dirs += samples
1035 endif
1036
1037 # The actual objects are generated when descending,
1038 # make sure no implicit rule kicks in
1039 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1040
1041 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1042 # Preset locale variables to speed up the build process. Limit locale
1043 # tweaks to this spot to avoid wrong language settings when running
1044 # make menuconfig etc.
1045 # Error messages still appears in the original language
1046
1047 PHONY += $(vmlinux-dirs)
1048 $(vmlinux-dirs): prepare scripts
1049         $(Q)$(MAKE) $(build)=$@
1050
1051 define filechk_kernel.release
1052         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1053 endef
1054
1055 # Store (new) KERNELRELEASE string in include/config/kernel.release
1056 include/config/kernel.release: include/config/auto.conf FORCE
1057         $(call filechk,kernel.release)
1058
1059
1060 # Things we need to do before we recursively start building the kernel
1061 # or the modules are listed in "prepare".
1062 # A multi level approach is used. prepareN is processed before prepareN-1.
1063 # archprepare is used in arch Makefiles and when processed asm symlink,
1064 # version.h and scripts_basic is processed / created.
1065
1066 PHONY += prepare archprepare prepare1 prepare2 prepare3
1067
1068 # prepare3 is used to check if we are building in a separate output directory,
1069 # and if so do:
1070 # 1) Check that make has not been executed in the kernel src $(srctree)
1071 prepare3: include/config/kernel.release
1072 ifneq ($(KBUILD_SRC),)
1073         @$(kecho) '  Using $(srctree) as source for kernel'
1074         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1075                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1076                 echo >&2 "  in the '$(srctree)' directory.";\
1077                 /bin/false; \
1078         fi;
1079 endif
1080
1081 # prepare2 creates a makefile if using a separate output directory.
1082 # From this point forward, .config has been reprocessed, so any rules
1083 # that need to depend on updated CONFIG_* values can be checked here.
1084 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1085
1086 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1087                    include/config/auto.conf
1088         $(cmd_crmodverdir)
1089
1090 archprepare: archheaders archscripts prepare1 scripts_basic
1091
1092 prepare0: archprepare gcc-plugins
1093         $(Q)$(MAKE) $(build)=.
1094
1095 # All the preparing..
1096 prepare: prepare0 prepare-objtool
1097
1098 # Support for using generic headers in asm-generic
1099 PHONY += asm-generic uapi-asm-generic
1100 asm-generic: uapi-asm-generic
1101         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1102                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1103 uapi-asm-generic:
1104         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1105                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1106
1107 PHONY += prepare-objtool
1108 prepare-objtool: $(objtool_target)
1109 ifeq ($(SKIP_STACK_VALIDATION),1)
1110 ifdef CONFIG_UNWINDER_ORC
1111         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1112         @false
1113 else
1114         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1115 endif
1116 endif
1117
1118 # Check for CONFIG flags that require compiler support. Abort the build
1119 # after .config has been processed, but before the kernel build starts.
1120 #
1121 # For security-sensitive CONFIG options, we don't want to fallback and/or
1122 # silently change which compiler flags will be used, since that leads to
1123 # producing kernels with different security feature characteristics
1124 # depending on the compiler used. (For example, "But I selected
1125 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1126 PHONY += prepare-compiler-check
1127 prepare-compiler-check: FORCE
1128 # Make sure compiler supports requested stack protector flag.
1129 ifdef stackp-name
1130   ifeq ($(call cc-option, $(stackp-flag)),)
1131         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1132                   $(stackp-flag) not supported by compiler >&2 && exit 1
1133   endif
1134 endif
1135 # Make sure compiler does not have buggy stack-protector support.
1136 ifdef stackp-check
1137   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1138         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1139                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1140   endif
1141 endif
1142         @:
1143
1144 # Generate some files
1145 # ---------------------------------------------------------------------------
1146
1147 # KERNELRELEASE can change from a few different places, meaning version.h
1148 # needs to be updated, so this check is forced on all builds
1149
1150 uts_len := 64
1151 define filechk_utsrelease.h
1152         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1153           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1154           exit 1;                                                         \
1155         fi;                                                               \
1156         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1157 endef
1158
1159 define filechk_version.h
1160         (echo \#define LINUX_VERSION_CODE $(shell                         \
1161         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1162         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1163 endef
1164
1165 $(version_h): $(srctree)/Makefile FORCE
1166         $(call filechk,version.h)
1167         $(Q)rm -f $(old_version_h)
1168
1169 include/generated/utsrelease.h: include/config/kernel.release FORCE
1170         $(call filechk,utsrelease.h)
1171
1172 PHONY += headerdep
1173 headerdep:
1174         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1175         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1176
1177 # ---------------------------------------------------------------------------
1178 # Kernel headers
1179
1180 #Default location for installed headers
1181 export INSTALL_HDR_PATH = $(objtree)/usr
1182
1183 # If we do an all arch process set dst to include/arch-$(hdr-arch)
1184 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
1185
1186 PHONY += archheaders
1187 archheaders:
1188
1189 PHONY += archscripts
1190 archscripts:
1191
1192 PHONY += __headers
1193 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1194         $(Q)$(MAKE) $(build)=scripts build_unifdef
1195
1196 PHONY += headers_install_all
1197 headers_install_all:
1198         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1199
1200 PHONY += headers_install
1201 headers_install: __headers
1202         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1203           $(error Headers not exportable for the $(SRCARCH) architecture))
1204         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1205         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
1206
1207 PHONY += headers_check_all
1208 headers_check_all: headers_install_all
1209         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1210
1211 PHONY += headers_check
1212 headers_check: headers_install
1213         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1214         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
1215
1216 # ---------------------------------------------------------------------------
1217 # Kernel selftest
1218
1219 PHONY += kselftest
1220 kselftest:
1221         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1222
1223 PHONY += kselftest-clean
1224 kselftest-clean:
1225         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1226
1227 PHONY += kselftest-merge
1228 kselftest-merge:
1229         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1230         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1231                 -m $(objtree)/.config \
1232                 $(srctree)/tools/testing/selftests/*/config
1233         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1234
1235 # ---------------------------------------------------------------------------
1236 # Modules
1237
1238 ifdef CONFIG_MODULES
1239
1240 # By default, build modules as well
1241
1242 all: modules
1243
1244 # Build modules
1245 #
1246 # A module can be listed more than once in obj-m resulting in
1247 # duplicate lines in modules.order files.  Those are removed
1248 # using awk while concatenating to the final file.
1249
1250 PHONY += modules
1251 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1252         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1253         @$(kecho) '  Building modules, stage 2.';
1254         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1255
1256 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1257         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1258
1259 %/modules.builtin: include/config/auto.conf
1260         $(Q)$(MAKE) $(modbuiltin)=$*
1261
1262
1263 # Target to prepare building external modules
1264 PHONY += modules_prepare
1265 modules_prepare: prepare scripts
1266
1267 # Target to install modules
1268 PHONY += modules_install
1269 modules_install: _modinst_ _modinst_post
1270
1271 PHONY += _modinst_
1272 _modinst_:
1273         @rm -rf $(MODLIB)/kernel
1274         @rm -f $(MODLIB)/source
1275         @mkdir -p $(MODLIB)/kernel
1276         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1277         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1278                 rm -f $(MODLIB)/build ; \
1279                 ln -s $(CURDIR) $(MODLIB)/build ; \
1280         fi
1281         @cp -f $(objtree)/modules.order $(MODLIB)/
1282         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1283         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1284
1285 # This depmod is only for convenience to give the initial
1286 # boot a modules.dep even before / is mounted read-write.  However the
1287 # boot script depmod is the master version.
1288 PHONY += _modinst_post
1289 _modinst_post: _modinst_
1290         $(call cmd,depmod)
1291
1292 ifeq ($(CONFIG_MODULE_SIG), y)
1293 PHONY += modules_sign
1294 modules_sign:
1295         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1296 endif
1297
1298 else # CONFIG_MODULES
1299
1300 # Modules not configured
1301 # ---------------------------------------------------------------------------
1302
1303 PHONY += modules modules_install
1304 modules modules_install:
1305         @echo >&2
1306         @echo >&2 "The present kernel configuration has modules disabled."
1307         @echo >&2 "Type 'make config' and enable loadable module support."
1308         @echo >&2 "Then build a kernel with module support enabled."
1309         @echo >&2
1310         @exit 1
1311
1312 endif # CONFIG_MODULES
1313
1314 ###
1315 # Cleaning is done on three levels.
1316 # make clean     Delete most generated files
1317 #                Leave enough to build external modules
1318 # make mrproper  Delete the current configuration, and all generated files
1319 # make distclean Remove editor backup files, patch leftover files and the like
1320
1321 # Directories & files removed with 'make clean'
1322 CLEAN_DIRS  += $(MODVERDIR)
1323
1324 # Directories & files removed with 'make mrproper'
1325 MRPROPER_DIRS  += include/config usr/include include/generated          \
1326                   arch/*/include/generated .tmp_objdiff
1327 MRPROPER_FILES += .config .config.old .version .old_version \
1328                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1329                   signing_key.pem signing_key.priv signing_key.x509     \
1330                   x509.genkey extra_certificates signing_key.x509.keyid \
1331                   signing_key.x509.signer vmlinux-gdb.py
1332
1333 # clean - Delete most, but leave enough to build external modules
1334 #
1335 clean: rm-dirs  := $(CLEAN_DIRS)
1336 clean: rm-files := $(CLEAN_FILES)
1337 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1338
1339 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1340 $(clean-dirs):
1341         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1342
1343 vmlinuxclean:
1344         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1345         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1346
1347 clean: archclean vmlinuxclean
1348
1349 # mrproper - Delete all generated files, including .config
1350 #
1351 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1352 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1353 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1354
1355 PHONY += $(mrproper-dirs) mrproper archmrproper
1356 $(mrproper-dirs):
1357         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1358
1359 mrproper: clean archmrproper $(mrproper-dirs)
1360         $(call cmd,rmdirs)
1361         $(call cmd,rmfiles)
1362
1363 # distclean
1364 #
1365 PHONY += distclean
1366
1367 distclean: mrproper
1368         @find $(srctree) $(RCS_FIND_IGNORE) \
1369                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1370                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1371                 -o -name 'core' \) \
1372                 -type f -print | xargs rm -f
1373
1374
1375 # Packaging of the kernel to various formats
1376 # ---------------------------------------------------------------------------
1377 # rpm target kept for backward compatibility
1378 package-dir     := scripts/package
1379
1380 %src-pkg: FORCE
1381         $(Q)$(MAKE) $(build)=$(package-dir) $@
1382 %pkg: include/config/kernel.release FORCE
1383         $(Q)$(MAKE) $(build)=$(package-dir) $@
1384 rpm: include/config/kernel.release FORCE
1385         $(Q)$(MAKE) $(build)=$(package-dir) $@
1386
1387
1388 # Brief documentation of the typical targets used
1389 # ---------------------------------------------------------------------------
1390
1391 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1392 boards := $(sort $(notdir $(boards)))
1393 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1394 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1395
1396 PHONY += help
1397 help:
1398         @echo  'Cleaning targets:'
1399         @echo  '  clean           - Remove most generated files but keep the config and'
1400         @echo  '                    enough build support to build external modules'
1401         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1402         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1403         @echo  ''
1404         @echo  'Configuration targets:'
1405         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1406         @echo  ''
1407         @echo  'Other generic targets:'
1408         @echo  '  all             - Build all targets marked with [*]'
1409         @echo  '* vmlinux         - Build the bare kernel'
1410         @echo  '* modules         - Build all modules'
1411         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1412         @echo  '  dir/            - Build all files in dir and below'
1413         @echo  '  dir/file.[ois]  - Build specified target only'
1414         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1415         @echo  '                    (requires compiler support for LLVM assembly generation)'
1416         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1417         @echo  '                    (requires a recent binutils and recent build (System.map))'
1418         @echo  '  dir/file.ko     - Build module including final link'
1419         @echo  '  modules_prepare - Set up for building external modules'
1420         @echo  '  tags/TAGS       - Generate tags file for editors'
1421         @echo  '  cscope          - Generate cscope index'
1422         @echo  '  gtags           - Generate GNU GLOBAL index'
1423         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1424         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1425         @echo  '  image_name      - Output the image name (use with make -s)'
1426         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1427          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1428          echo  ''
1429         @echo  'Static analysers:'
1430         @echo  '  checkstack      - Generate a list of stack hogs'
1431         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1432         @echo  '  versioncheck    - Sanity check on version.h usage'
1433         @echo  '  includecheck    - Check for duplicate included header files'
1434         @echo  '  export_report   - List the usages of all exported symbols'
1435         @echo  '  headers_check   - Sanity check on exported headers'
1436         @echo  '  headerdep       - Detect inclusion cycles in headers'
1437         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1438         @echo  ''
1439         @echo  'Kernel selftest:'
1440         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1441         @echo  '                    Build, install, and boot kernel before'
1442         @echo  '                    running kselftest on it'
1443         @echo  '  kselftest-clean - Remove all generated kselftest files'
1444         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1445         @echo  '                    .config.'
1446         @echo  ''
1447         @echo 'Userspace tools targets:'
1448         @echo '  use "make tools/help"'
1449         @echo '  or  "cd tools; make help"'
1450         @echo  ''
1451         @echo  'Kernel packaging:'
1452         @$(MAKE) $(build)=$(package-dir) help
1453         @echo  ''
1454         @echo  'Documentation targets:'
1455         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1456         @echo  ''
1457         @echo  'Architecture specific targets ($(SRCARCH)):'
1458         @$(if $(archhelp),$(archhelp),\
1459                 echo '  No architecture specific help defined for $(SRCARCH)')
1460         @echo  ''
1461         @$(if $(boards), \
1462                 $(foreach b, $(boards), \
1463                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1464                 echo '')
1465         @$(if $(board-dirs), \
1466                 $(foreach b, $(board-dirs), \
1467                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1468                 printf "  %-16s - Show all of the above\\n" help-boards; \
1469                 echo '')
1470
1471         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1472         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1473         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1474         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1475         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1476         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1477         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1478         @echo  '                1: warnings which may be relevant and do not occur too often'
1479         @echo  '                2: warnings which occur quite often but may still be relevant'
1480         @echo  '                3: more obscure warnings, can most likely be ignored'
1481         @echo  '                Multiple levels can be combined with W=12 or W=123'
1482         @echo  ''
1483         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1484         @echo  'For further info see the ./README file'
1485
1486
1487 help-board-dirs := $(addprefix help-,$(board-dirs))
1488
1489 help-boards: $(help-board-dirs)
1490
1491 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1492
1493 $(help-board-dirs): help-%:
1494         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1495         @$(if $(boards-per-dir), \
1496                 $(foreach b, $(boards-per-dir), \
1497                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1498                 echo '')
1499
1500
1501 # Documentation targets
1502 # ---------------------------------------------------------------------------
1503 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs
1504 PHONY += $(DOC_TARGETS)
1505 $(DOC_TARGETS): scripts_basic FORCE
1506         $(Q)$(MAKE) $(build)=Documentation $@
1507
1508 else # KBUILD_EXTMOD
1509
1510 ###
1511 # External module support.
1512 # When building external modules the kernel used as basis is considered
1513 # read-only, and no consistency checks are made and the make
1514 # system is not used on the basis kernel. If updates are required
1515 # in the basis kernel ordinary make commands (without M=...) must
1516 # be used.
1517 #
1518 # The following are the only valid targets when building external
1519 # modules.
1520 # make M=dir clean     Delete all automatically generated files
1521 # make M=dir modules   Make all modules in specified dir
1522 # make M=dir           Same as 'make M=dir modules'
1523 # make M=dir modules_install
1524 #                      Install the modules built in the module directory
1525 #                      Assumes install directory is already created
1526
1527 # We are always building modules
1528 KBUILD_MODULES := 1
1529
1530 PHONY += $(objtree)/Module.symvers
1531 $(objtree)/Module.symvers:
1532         @test -e $(objtree)/Module.symvers || ( \
1533         echo; \
1534         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1535         echo "           is missing; modules will have no dependencies and modversions."; \
1536         echo )
1537
1538 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1539 PHONY += $(module-dirs) modules
1540 $(module-dirs): prepare $(objtree)/Module.symvers
1541         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1542
1543 modules: $(module-dirs)
1544         @$(kecho) '  Building modules, stage 2.';
1545         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1546
1547 PHONY += modules_install
1548 modules_install: _emodinst_ _emodinst_post
1549
1550 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1551 PHONY += _emodinst_
1552 _emodinst_:
1553         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1554         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1555
1556 PHONY += _emodinst_post
1557 _emodinst_post: _emodinst_
1558         $(call cmd,depmod)
1559
1560 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1561
1562 PHONY += $(clean-dirs) clean
1563 $(clean-dirs):
1564         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1565
1566 clean:  rm-dirs := $(MODVERDIR)
1567 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1568
1569 PHONY += help
1570 help:
1571         @echo  '  Building external modules.'
1572         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1573         @echo  ''
1574         @echo  '  modules         - default target, build the module(s)'
1575         @echo  '  modules_install - install the module'
1576         @echo  '  clean           - remove generated files in module directory only'
1577         @echo  ''
1578
1579 # Dummies...
1580 PHONY += prepare scripts
1581 prepare:
1582         $(cmd_crmodverdir)
1583 scripts: ;
1584 endif # KBUILD_EXTMOD
1585
1586 clean: $(clean-dirs)
1587         $(call cmd,rmdirs)
1588         $(call cmd,rmfiles)
1589         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1590                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1591                 -o -name '*.ko.*' \
1592                 -o -name '*.dwo'  \
1593                 -o -name '*.su'  \
1594                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1595                 -o -name '*.symtypes' -o -name 'modules.order' \
1596                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1597                 -o -name '*.c.[012]*.*' \
1598                 -o -name '*.ll' \
1599                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1600
1601 # Generate tags for editors
1602 # ---------------------------------------------------------------------------
1603 quiet_cmd_tags = GEN     $@
1604       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1605
1606 tags TAGS cscope gtags: FORCE
1607         $(call cmd,tags)
1608
1609 # Scripts to check various things for consistency
1610 # ---------------------------------------------------------------------------
1611
1612 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1613
1614 includecheck:
1615         find $(srctree)/* $(RCS_FIND_IGNORE) \
1616                 -name '*.[hcS]' -type f -print | sort \
1617                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1618
1619 versioncheck:
1620         find $(srctree)/* $(RCS_FIND_IGNORE) \
1621                 -name '*.[hcS]' -type f -print | sort \
1622                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1623
1624 coccicheck:
1625         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1626
1627 namespacecheck:
1628         $(PERL) $(srctree)/scripts/namespace.pl
1629
1630 export_report:
1631         $(PERL) $(srctree)/scripts/export_report.pl
1632
1633 endif #ifeq ($(config-targets),1)
1634 endif #ifeq ($(mixed-targets),1)
1635
1636 PHONY += checkstack kernelrelease kernelversion image_name
1637
1638 # UML needs a little special treatment here.  It wants to use the host
1639 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1640 # else wants $(ARCH), including people doing cross-builds, which means
1641 # that $(SUBARCH) doesn't work here.
1642 ifeq ($(ARCH), um)
1643 CHECKSTACK_ARCH := $(SUBARCH)
1644 else
1645 CHECKSTACK_ARCH := $(ARCH)
1646 endif
1647 checkstack:
1648         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1649         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1650
1651 kernelrelease:
1652         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1653
1654 kernelversion:
1655         @echo $(KERNELVERSION)
1656
1657 image_name:
1658         @echo $(KBUILD_IMAGE)
1659
1660 # Clear a bunch of variables before executing the submake
1661 tools/: FORCE
1662         $(Q)mkdir -p $(objtree)/tools
1663         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1664
1665 tools/%: FORCE
1666         $(Q)mkdir -p $(objtree)/tools
1667         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1668
1669 # Single targets
1670 # ---------------------------------------------------------------------------
1671 # Single targets are compatible with:
1672 # - build with mixed source and output
1673 # - build with separate output dir 'make O=...'
1674 # - external modules
1675 #
1676 #  target-dir => where to store outputfile
1677 #  build-dir  => directory in kernel source tree to use
1678
1679 ifeq ($(KBUILD_EXTMOD),)
1680         build-dir  = $(patsubst %/,%,$(dir $@))
1681         target-dir = $(dir $@)
1682 else
1683         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1684         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1685         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1686 endif
1687
1688 %.s: %.c prepare scripts FORCE
1689         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1690 %.i: %.c prepare scripts FORCE
1691         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1692 %.o: %.c prepare scripts FORCE
1693         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1694 %.lst: %.c prepare scripts FORCE
1695         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1696 %.s: %.S prepare scripts FORCE
1697         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1698 %.o: %.S prepare scripts FORCE
1699         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1700 %.symtypes: %.c prepare scripts FORCE
1701         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1702 %.ll: %.c prepare scripts FORCE
1703         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1704
1705 # Modules
1706 /: prepare scripts FORCE
1707         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1708         $(build)=$(build-dir)
1709 # Make sure the latest headers are built for Documentation
1710 Documentation/ samples/: headers_install
1711 %/: prepare scripts FORCE
1712         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1713         $(build)=$(build-dir)
1714 %.ko: prepare scripts FORCE
1715         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1716         $(build)=$(build-dir) $(@:.ko=.o)
1717         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1718
1719 # FIXME Should go into a make.lib or something
1720 # ===========================================================================
1721
1722 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1723       cmd_rmdirs = rm -rf $(rm-dirs)
1724
1725 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1726       cmd_rmfiles = rm -f $(rm-files)
1727
1728 # Run depmod only if we have System.map and depmod is executable
1729 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1730       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1731                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1732
1733 # Create temporary dir for module support files
1734 # clean it up only when building all modules
1735 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1736                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1737
1738 # read all saved command lines
1739
1740 targets := $(wildcard $(sort $(targets)))
1741 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1742
1743 ifneq ($(cmd_files),)
1744   $(cmd_files): ;       # Do not try to update included dependency files
1745   include $(cmd_files)
1746 endif
1747
1748 endif   # skip-makefile
1749
1750 PHONY += FORCE
1751 FORCE:
1752
1753 # Declare the contents of the .PHONY variable as phony.  We keep that
1754 # information in a variable so we can use it in if_changed and friends.
1755 .PHONY: $(PHONY)