Makefile

   1 VERSION = 3
   2 PATCHLEVEL = 14
   3 SUBLEVEL = 46
   4 EXTRAVERSION = -elbrus
   5 NAME = Remembering Coco
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # Do not:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoids hard-to-debug behaviour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # Avoid funny character set dependencies
  20 unexport LC_ALL
  21 LC_COLLATE=C
  22 LC_NUMERIC=C
  23 export LC_COLLATE LC_NUMERIC
  24
  25 # Avoid interference with shell env settings
  26 unexport GREP_OPTIONS
  27
  28 # We are using a recursive build, so we need to do a little thinking
  29 # to get the ordering right.
  30 #
  31 # Most importantly: sub-Makefiles should only ever modify files in
  32 # their own directory. If in some directory we have a dependency on
  33 # a file in another dir (which doesn't happen often, but it's often
  34 # unavoidable when linking the built-in.o targets which finally
  35 # turn into vmlinux), we will call a sub make in that other dir, and
  36 # after that we are sure that everything which is in that other dir
  37 # is now up to date.
  38 #
  39 # The only cases where we need to modify files which have global
  40 # effects are thus separated out and done before the recursive
  41 # descending is started. They are now explicitly listed as the
  42 # prepare rule.
  43
  44 # To put more focus on warnings, be less verbose as default
  45 # Use 'make V=1' to see the full commands
  46
  47 ifeq ("$(origin V)", "command line")
  48   KBUILD_VERBOSE = $(V)
  49 endif
  50 ifndef KBUILD_VERBOSE
  51   KBUILD_VERBOSE = 0
  52 endif
  53
  54 # Call a source code checker (by default, "sparse") as part of the
  55 # C compilation.
  56 #
  57 # Use 'make C=1' to enable checking of only re-compiled files.
  58 # Use 'make C=2' to enable checking of *all* source files, regardless
  59 # of whether they are re-compiled or not.
  60 #
  61 # See the file "Documentation/sparse.txt" for more details, including
  62 # where to get the "sparse" utility.
  63
  64 ifeq ("$(origin C)", "command line")
  65   KBUILD_CHECKSRC = $(C)
  66 endif
  67 ifndef KBUILD_CHECKSRC
  68   KBUILD_CHECKSRC = 0
  69 endif
  70
  71 # Use make M=dir to specify directory of external module to build
  72 # Old syntax make ... SUBDIRS=$PWD is still supported
  73 # Setting the environment variable KBUILD_EXTMOD take precedence
  74 ifdef SUBDIRS
  75   KBUILD_EXTMOD ?= $(SUBDIRS)
  76 endif
  77
  78 ifeq ("$(origin M)", "command line")
  79   KBUILD_EXTMOD := $(M)
  80 endif
  81
  82 # kbuild supports saving output files in a separate directory.
  83 # To locate output files in a separate directory two syntaxes are supported.
  84 # In both cases the working directory must be the root of the kernel src.
  85 # 1) O=
  86 # Use "make O=dir/to/store/output/files/"
  87 #
  88 # 2) Set KBUILD_OUTPUT
  89 # Set the environment variable KBUILD_OUTPUT to point to the directory
  90 # where the output files shall be placed.
  91 # export KBUILD_OUTPUT=dir/to/store/output/files/
  92 # make
  93 #
  94 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  95 # variable.
  96
  97
  98 # KBUILD_SRC is set on invocation of make in OBJ directory
  99 # KBUILD_SRC is not intended to be used by the regular user (for now)
 100 ifeq ($(KBUILD_SRC),)
 101
 102 # OK, Make called in directory where kernel src resides
 103 # Do we want to locate output files in a separate directory?
 104 ifeq ("$(origin O)", "command line")
 105   KBUILD_OUTPUT := $(O)
 106 endif
 107
 108 ifeq ("$(origin W)", "command line")
 109   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 110 endif
 111
 112 # That's our default target when none is given on the command line
 113 PHONY := _all
 114 _all:
 115
 116 # Cancel implicit rules on top Makefile
 117 $(CURDIR)/Makefile Makefile: ;
 118
 119 ifneq ($(KBUILD_OUTPUT),)
 120 # Invoke a second make in the output directory, passing relevant variables
 121 # check that the output directory actually exists
 122 saved-output := $(KBUILD_OUTPUT)
 123 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 124 $(if $(KBUILD_OUTPUT),, \
 125      $(error output directory "$(saved-output)" does not exist))
 126
 127 PHONY += $(MAKECMDGOALS) sub-make
 128
 129 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 130         @:
 131
 132 sub-make: FORCE
 133         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 134         KBUILD_SRC=$(CURDIR) \
 135         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 136         $(filter-out _all sub-make,$(MAKECMDGOALS))
 137
 138 # Leave processing to above invocation of make
 139 skip-makefile := 1
 140 endif # ifneq ($(KBUILD_OUTPUT),)
 141 endif # ifeq ($(KBUILD_SRC),)
 142
 143 # We process the rest of the Makefile if this is the final invocation of make
 144 ifeq ($(skip-makefile),)
 145
 146 # If building an external module we do not care about the all: rule
 147 # but instead _all depend on modules
 148 PHONY += all
 149 ifeq ($(KBUILD_EXTMOD),)
 150 _all: all
 151 else
 152 _all: modules
 153 endif
 154
 155 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 156 objtree         := $(CURDIR)
 157 src             := $(srctree)
 158 obj             := $(objtree)
 159
 160 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 161
 162 export srctree objtree VPATH
 163
 164
 165 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 166 # first, and if a usermode build is happening, the "ARCH=um" on the command
 167 # line overrides the setting of ARCH below.  If a native build is happening,
 168 # then ARCH is assigned, getting whatever value it gets normally, and
 169 # SUBARCH is subsequently ignored.
 170
 171 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 172                                   -e s/sun4u/sparc64/ \
 173                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 174                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 175                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 176                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 177
 178 # Cross compiling and selecting different set of gcc/bin-utils
 179 # ---------------------------------------------------------------------------
 180 #
 181 # When performing cross compilation for other architectures ARCH shall be set
 182 # to the target architecture. (See arch/* for the possibilities).
 183 # ARCH can be set during invocation of make:
 184 # make ARCH=ia64
 185 # Another way is to have ARCH set in the environment.
 186 # The default ARCH is the host where make is executed.
 187
 188 # CROSS_COMPILE specify the prefix used for all executables used
 189 # during compilation. Only gcc and related bin-utils executables
 190 # are prefixed with $(CROSS_COMPILE).
 191 # CROSS_COMPILE can be set on the command line
 192 # make CROSS_COMPILE=ia64-linux-
 193 # Alternatively CROSS_COMPILE can be set in the environment.
 194 # A third alternative is to store a setting in .config so that plain
 195 # "make" in the configured kernel build directory always uses that.
 196 # Default value for CROSS_COMPILE is not to prefix executables
 197 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 198 ARCH            ?= $(SUBARCH)
 199 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 200
 201 # Architecture as present in compile.h
 202 UTS_MACHINE     := $(ARCH)
 203 SRCARCH         := $(ARCH)
 204
 205 # Additional ARCH settings for x86
 206 ifeq ($(ARCH),i386)
 207         SRCARCH := x86
 208 endif
 209 ifeq ($(ARCH),x86_64)
 210         SRCARCH := x86
 211 endif
 212
 213 # Additional ARCH settings for sparc
 214 ifeq ($(ARCH),sparc32)
 215        SRCARCH := sparc
 216 endif
 217 ifeq ($(ARCH),sparc64)
 218        SRCARCH := sparc
 219 endif
 220
 221 # Additional ARCH settings for sh
 222 ifeq ($(ARCH),sh64)
 223        SRCARCH := sh
 224 endif
 225
 226 # Additional ARCH settings for tile
 227 ifeq ($(ARCH),tilepro)
 228        SRCARCH := tile
 229 endif
 230 ifeq ($(ARCH),tilegx)
 231        SRCARCH := tile
 232 endif
 233
 234 # Where to locate arch specific headers
 235 hdr-arch  := $(SRCARCH)
 236
 237 KCONFIG_CONFIG  ?= .config
 238 export KCONFIG_CONFIG
 239
 240 # SHELL used by kbuild
 241 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 242           else if [ -x /bin/bash ]; then echo /bin/bash; \
 243           else echo sh; fi ; fi)
 244
 245 HOSTCC       = gcc
 246 HOSTCXX      = g++
 247 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 248 HOSTCXXFLAGS = -O2
 249
 250 # Decide whether to build built-in, modular, or both.
 251 # Normally, just do built-in.
 252
 253 KBUILD_MODULES :=
 254 KBUILD_BUILTIN := 1
 255
 256 #       If we have only "make modules", don't compile built-in objects.
 257 #       When we're building modules with modversions, we need to consider
 258 #       the built-in objects during the descend as well, in order to
 259 #       make sure the checksums are up to date before we record them.
 260
 261 ifeq ($(MAKECMDGOALS),modules)
 262   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 263 endif
 264
 265 #       If we have "make <whatever> modules", compile modules
 266 #       in addition to whatever we do anyway.
 267 #       Just "make" or "make all" shall build modules as well
 268
 269 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 270   KBUILD_MODULES := 1
 271 endif
 272
 273 ifeq ($(MAKECMDGOALS),)
 274   KBUILD_MODULES := 1
 275 endif
 276
 277 export KBUILD_MODULES KBUILD_BUILTIN
 278 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 279
 280 # Beautify output
 281 # ---------------------------------------------------------------------------
 282 #
 283 # Normally, we echo the whole command before executing it. By making
 284 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 285 # $(quiet) to choose other forms of output instead, e.g.
 286 #
 287 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 288 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 289 #
 290 # If $(quiet) is empty, the whole command will be printed.
 291 # If it is set to "quiet_", only the short version will be printed.
 292 # If it is set to "silent_", nothing will be printed at all, since
 293 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 294 #
 295 # A simple variant is to prefix commands with $(Q) - that's useful
 296 # for commands that shall be hidden in non-verbose mode.
 297 #
 298 #       $(Q)ln $@ :<
 299 #
 300 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 301 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 302
 303 ifeq ($(KBUILD_VERBOSE),1)
 304   quiet =
 305   Q =
 306 else
 307   quiet=quiet_
 308   Q = @
 309 endif
 310
 311 # If the user is running make -s (silent mode), suppress echoing of
 312 # commands
 313
 314 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
 315 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
 316   quiet=silent_
 317 endif
 318 else                                    # make-3.8x
 319 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 320   quiet=silent_
 321 endif
 322 endif
 323
 324 export quiet Q KBUILD_VERBOSE
 325
 326
 327 # Look for make include files relative to root of kernel src
 328 MAKEFLAGS += --include-dir=$(srctree)
 329
 330 # We need some generic definitions (do not try to remake the file).
 331 $(srctree)/scripts/Kbuild.include: ;
 332 include $(srctree)/scripts/Kbuild.include
 333
 334 # Make variables (CC, etc...)
 335
 336 CC              = $(CROSS_COMPILE)gcc
 337 CPP             = $(CC) -E
 338 ifeq  ($(call cc-lcc-yn),y)
 339 AS              = $(shell $(CC) -print-prog-name=as)
 340 LD              = $(shell $(CC) -print-prog-name=ld)
 341 AR              = $(shell $(CC) -print-prog-name=ar)
 342 NM              = $(shell $(CC) -print-prog-name=nm)
 343 STRIP           = $(shell $(CC) -print-prog-name=strip)
 344 OBJCOPY         = $(shell $(CC) -print-prog-name=objcopy)
 345 OBJDUMP         = $(shell $(CC) -print-prog-name=objdump)
 346 else
 347 AS              = $(CROSS_COMPILE)as
 348 LD              = $(CROSS_COMPILE)ld
 349 AR              = $(CROSS_COMPILE)ar
 350 NM              = $(CROSS_COMPILE)nm
 351 STRIP           = $(CROSS_COMPILE)strip
 352 OBJCOPY         = $(CROSS_COMPILE)objcopy
 353 OBJDUMP         = $(CROSS_COMPILE)objdump
 354 endif
 355 AWK             = awk
 356 GENKSYMS        = scripts/genksyms/genksyms
 357 INSTALLKERNEL  := installkernel
 358 DEPMOD          = /sbin/depmod
 359 PERL            = perl
 360 CHECK           = sparse
 361
 362 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 363                   -Wbitwise -Wno-return-void $(CF)
 364 CFLAGS_MODULE   =
 365 AFLAGS_MODULE   =
 366 LDFLAGS_MODULE  =
 367 CFLAGS_KERNEL   =
 368 AFLAGS_KERNEL   =
 369 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 370
 371
 372 # Use USERINCLUDE when you must reference the UAPI directories only.
 373 USERINCLUDE    := \
 374                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 375                 -Iarch/$(hdr-arch)/include/generated/uapi \
 376                 -I$(srctree)/include/uapi \
 377                 -Iinclude/generated/uapi \
 378                 -include $(srctree)/include/linux/kconfig.h
 379
 380 # Use LINUXINCLUDE when you must reference the include/ directory.
 381 # Needed to be compatible with the O= option
 382 LINUXINCLUDE    := \
 383                 -I$(srctree)/arch/$(hdr-arch)/include \
 384                 -Iarch/$(hdr-arch)/include/generated \
 385                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 386                 -Iinclude \
 387                 $(USERINCLUDE)
 388
 389 KBUILD_CPPFLAGS := -D__KERNEL__
 390
 391 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 392                    -fno-strict-aliasing -fno-common \
 393                    -Werror-implicit-function-declaration \
 394                    -Wno-format-security \
 395                    -fno-delete-null-pointer-checks \
 396                    -std=gnu89
 397
 398 KBUILD_AFLAGS_KERNEL :=
 399 KBUILD_CFLAGS_KERNEL :=
 400 KBUILD_AFLAGS   := -D__ASSEMBLY__
 401 KBUILD_AFLAGS_MODULE  := -DMODULE
 402 KBUILD_CFLAGS_MODULE  := -DMODULE
 403 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 404
 405 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 406 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 407 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 408
 409 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 410 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 411 export CPP AR NM STRIP OBJCOPY OBJDUMP
 412 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 413 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 414
 415 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 416 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 417 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 418 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 419 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 420 export KBUILD_ARFLAGS
 421
 422 # When compiling out-of-tree modules, put MODVERDIR in the module
 423 # tree rather than in the kernel tree. The kernel tree might
 424 # even be read-only.
 425 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 426
 427 # Files to ignore in find ... statements
 428
 429 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
 430                    -o -name .pc -o -name .hg -o -name .git \) -prune -o
 431 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 432                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 433
 434 # ===========================================================================
 435 # Rules shared between *config targets and build targets
 436
 437 # Basic helpers built in scripts/
 438 PHONY += scripts_basic
 439 scripts_basic:
 440         $(Q)$(MAKE) $(build)=scripts/basic
 441         $(Q)rm -f .tmp_quiet_recordmcount
 442
 443 # To avoid any implicit rule to kick in, define an empty command.
 444 scripts/basic/%: scripts_basic ;
 445
 446 PHONY += outputmakefile
 447 # outputmakefile generates a Makefile in the output directory, if using a
 448 # separate output directory. This allows convenient use of make in the
 449 # output directory.
 450 outputmakefile:
 451 ifneq ($(KBUILD_SRC),)
 452         $(Q)ln -fsn $(srctree) source
 453         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 454             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 455 endif
 456
 457 # Support for using generic headers in asm-generic
 458 PHONY += asm-generic
 459 asm-generic:
 460         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 461                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 462         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 463                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 464
 465 # To make sure we do not include .config for any of the *config targets
 466 # catch them early, and hand them over to scripts/kconfig/Makefile
 467 # It is allowed to specify more targets when calling make, including
 468 # mixing *config targets and build targets.
 469 # For example 'make oldconfig all'.
 470 # Detect when mixed targets is specified, and make a second invocation
 471 # of make so .config is not included in this case either (for *config).
 472
 473 version_h := include/generated/uapi/linux/version.h
 474
 475 no-dot-config-targets := clean mrproper distclean \
 476                          cscope gtags TAGS tags help %docs check% coccicheck \
 477                          $(version_h) headers_% archheaders archscripts \
 478                          kernelversion %src-pkg
 479
 480 config-targets := 0
 481 mixed-targets  := 0
 482 dot-config     := 1
 483
 484 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 485         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 486                 dot-config := 0
 487         endif
 488 endif
 489
 490 ifeq ($(KBUILD_EXTMOD),)
 491         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 492                 config-targets := 1
 493                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 494                         mixed-targets := 1
 495                 endif
 496         endif
 497 endif
 498
 499 ifeq ($(mixed-targets),1)
 500 # ===========================================================================
 501 # We're called with mixed targets (*config and build targets).
 502 # Handle them one by one.
 503
 504 %:: FORCE
 505         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 506
 507 else
 508 ifeq ($(config-targets),1)
 509 # ===========================================================================
 510 # *config targets only - make sure prerequisites are updated, and descend
 511 # in scripts/kconfig to make the *config target
 512
 513 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 514 # KBUILD_DEFCONFIG may point out an alternative default configuration
 515 # used for 'make defconfig'
 516 include $(srctree)/arch/$(SRCARCH)/Makefile
 517 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 518
 519 config: scripts_basic outputmakefile FORCE
 520         $(Q)mkdir -p include/linux include/config
 521         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 522
 523 %config: scripts_basic outputmakefile FORCE
 524         $(Q)mkdir -p include/linux include/config
 525         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 526
 527 else
 528 # ===========================================================================
 529 # Build targets only - this includes vmlinux, arch specific targets, clean
 530 # targets and others. In general all targets except *config targets.
 531
 532 ifeq ($(KBUILD_EXTMOD),)
 533 # Additional helpers built in scripts/
 534 # Carefully list dependencies so we do not try to build scripts twice
 535 # in parallel
 536 PHONY += scripts
 537 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 538          asm-generic
 539         $(Q)$(MAKE) $(build)=$(@)
 540
 541 # Objects we will link into vmlinux / subdirs we need to visit
 542 init-y          := init/
 543 drivers-y       := drivers/ sound/ firmware/
 544 net-y           := net/
 545 libs-y          := lib/
 546 core-y          := usr/
 547 endif # KBUILD_EXTMOD
 548
 549 ifeq ($(dot-config),1)
 550 # Read in config
 551 -include include/config/auto.conf
 552
 553 ifeq ($(KBUILD_EXTMOD),)
 554 # Read in dependencies to all Kconfig* files, make sure to run
 555 # oldconfig if changes are detected.
 556 -include include/config/auto.conf.cmd
 557
 558 # To avoid any implicit rule to kick in, define an empty command
 559 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 560
 561 # If .config is newer than include/config/auto.conf, someone tinkered
 562 # with it and forgot to run make oldconfig.
 563 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 564 # we execute the config step to be sure to catch updated Kconfig files
 565 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 566         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 567 else
 568 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 569 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 570 PHONY += include/config/auto.conf
 571
 572 include/config/auto.conf:
 573         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 574         echo >&2;                                                       \
 575         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 576         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 577         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 578         echo >&2 ;                                                      \
 579         /bin/false)
 580
 581 endif # KBUILD_EXTMOD
 582
 583 else
 584 # Dummy target needed, because used as prerequisite
 585 include/config/auto.conf: ;
 586 endif # $(dot-config)
 587
 588 # The all: target is the default when no target is given on the
 589 # command line.
 590 # This allow a user to issue only 'make' to build a kernel including modules
 591 # Defaults to vmlinux, but the arch makefile usually adds further targets
 592 all: vmlinux
 593
 594 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 595 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 596 else
 597 KBUILD_CFLAGS   += -O2
 598 endif
 599
 600 include $(srctree)/arch/$(SRCARCH)/Makefile
 601
 602 ifdef CONFIG_READABLE_ASM
 603 # Disable optimizations that make assembler listings hard to read.
 604 # reorder blocks reorders the control in the function
 605 # ipa clone creates specialized cloned functions
 606 # partial inlining inlines only parts of functions
 607 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 608                  $(call cc-option,-fno-ipa-cp-clone,) \
 609                  $(call cc-option,-fno-partial-inlining)
 610 endif
 611
 612 ifneq ($(CONFIG_FRAME_WARN),0)
 613 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 614 endif
 615
 616 # Handle stack protector mode.
 617 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 618   stackp-flag := -fstack-protector
 619   ifeq ($(call cc-option, $(stackp-flag)),)
 620     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
 621              -fstack-protector not supported by compiler)
 622   endif
 623 else
 624 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 625   stackp-flag := -fstack-protector-strong
 626   ifeq ($(call cc-option, $(stackp-flag)),)
 627     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 628               -fstack-protector-strong not supported by compiler)
 629   endif
 630 else
 631   # Force off for distro compilers that enable stack protector by default.
 632   stackp-flag := $(call cc-option, -fno-stack-protector)
 633 endif
 634 endif
 635 KBUILD_CFLAGS += $(stackp-flag)
 636
 637 # This warning generated too much noise in a regular build.
 638 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 639 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 640
 641 ifdef CONFIG_FRAME_POINTER
 642 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 643 else
 644 # Some targets (ARM with Thumb2, for example), can't be built with frame
 645 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 646 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 647 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 648 # -fomit-frame-pointer with FUNCTION_TRACER.
 649 ifndef CONFIG_FUNCTION_TRACER
 650 KBUILD_CFLAGS   += -fomit-frame-pointer
 651 endif
 652 endif
 653
 654 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 655
 656 ifdef CONFIG_DEBUG_INFO
 657 KBUILD_CFLAGS   += -g
 658 KBUILD_AFLAGS   += -Wa,--gdwarf-2
 659 endif
 660
 661 ifdef CONFIG_DEBUG_INFO_REDUCED
 662 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 663                    $(call cc-option,-fno-var-tracking)
 664 endif
 665
 666 ifdef CONFIG_FUNCTION_TRACER
 667 ifdef CONFIG_HAVE_FENTRY
 668 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 669 endif
 670 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
 671 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 672 ifdef CONFIG_DYNAMIC_FTRACE
 673         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 674                 BUILD_C_RECORDMCOUNT := y
 675                 export BUILD_C_RECORDMCOUNT
 676         endif
 677 endif
 678 endif
 679
 680 # We trigger additional mismatches with less inlining
 681 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 682 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 683 endif
 684
 685 # arch Makefile may override CC so keep this after arch Makefile is included
 686 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 687 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 688
 689 # warn about C99 declaration after statement
 690 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 691
 692 # disable pointer signed / unsigned warnings in gcc 4.0
 693 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 694
 695 # MCST: The original gcc bug which caused introduction of -fno-strict-overflow
 696 # (optimizing away pointer overflow checking) does not exist in lcc, and this
 697 # option prohibits many compiler optimizations.
 698 ifneq  ($(call cc-lcc-yn),y)
 699 # disable invalid "can't wrap" optimizations for signed / pointers
 700 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 701 endif
 702
 703 # conserve stack if available
 704 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 705
 706 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 707 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 708
 709 # require functions to have arguments in prototypes, not empty 'int foo()'
 710 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 711
 712 # Prohibit date/time macros, which would make the build non-deterministic
 713 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 714
 715 # use the deterministic mode of AR if available
 716 KBUILD_ARFLAGS := $(call ar-option,D)
 717
 718 # check for 'asm goto'
 719 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 720         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 721 endif
 722
 723 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 724 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 725 KBUILD_AFLAGS += $(KAFLAGS)
 726 KBUILD_CFLAGS += $(KCFLAGS)
 727
 728 # Use --build-id when available.
 729 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 730                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 731 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 732 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 733
 734 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 735 LDFLAGS_vmlinux += $(call ld-option, -X,)
 736 endif
 737
 738 # Default kernel image to build when no specific target is given.
 739 # KBUILD_IMAGE may be overruled on the command line or
 740 # set in the environment
 741 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 742 # this default value
 743 export KBUILD_IMAGE ?= vmlinux
 744
 745 #
 746 # INSTALL_PATH specifies where to place the updated kernel and system map
 747 # images. Default is /boot, but you can set it to other values
 748 export  INSTALL_PATH ?= /boot
 749
 750 #
 751 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 752 # relocations required by build roots.  This is not defined in the
 753 # makefile but the argument can be passed to make if needed.
 754 #
 755
 756 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 757 export MODLIB
 758
 759 #
 760 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 761 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 762 #  the default option --strip-debug will be used.  Otherwise,
 763 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 764
 765 ifdef INSTALL_MOD_STRIP
 766 ifeq ($(INSTALL_MOD_STRIP),1)
 767 mod_strip_cmd = $(STRIP) --strip-debug
 768 else
 769 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 770 endif # INSTALL_MOD_STRIP=1
 771 else
 772 mod_strip_cmd = true
 773 endif # INSTALL_MOD_STRIP
 774 export mod_strip_cmd
 775
 776 # Select initial ramdisk compression format, default is gzip(1).
 777 # This shall be used by the dracut(8) tool while creating an initramfs image.
 778 #
 779 INITRD_COMPRESS-y                  := gzip
 780 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 781 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 782 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 783 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 784 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 785 # do not export INITRD_COMPRESS, since we didn't actually
 786 # choose a sane default compression above.
 787 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 788
 789 ifdef CONFIG_MODULE_SIG_ALL
 790 MODSECKEY = ./signing_key.priv
 791 MODPUBKEY = ./signing_key.x509
 792 export MODPUBKEY
 793 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
 794 else
 795 mod_sign_cmd = true
 796 endif
 797 export mod_sign_cmd
 798
 799
 800 ifeq ($(KBUILD_EXTMOD),)
 801 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ ltt/
 802
 803 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 804                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 805                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 806
 807 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 808                      $(init-n) $(init-) \
 809                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 810                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 811
 812 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 813 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 814 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 815 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 816 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 817 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 818 libs-y          := $(libs-y1) $(libs-y2)
 819
 820 # Externally visible symbols (used by link-vmlinux.sh)
 821 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 822 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 823 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 824 export LDFLAGS_vmlinux
 825 # used by scripts/pacmage/Makefile
 826 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
 827
 828 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 829
 830 # Final link of vmlinux
 831       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 832 quiet_cmd_link-vmlinux = LINK    $@
 833
 834 # Include targets which we want to
 835 # execute if the rest of the kernel build went well.
 836 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 837 ifdef CONFIG_HEADERS_CHECK
 838         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 839 endif
 840 ifdef CONFIG_SAMPLES
 841         $(Q)$(MAKE) $(build)=samples
 842 endif
 843 ifdef CONFIG_BUILD_DOCSRC
 844         $(Q)$(MAKE) $(build)=Documentation
 845 endif
 846         +$(call if_changed,link-vmlinux)
 847
 848 # The actual objects are generated when descending,
 849 # make sure no implicit rule kicks in
 850 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 851
 852 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 853 # Preset locale variables to speed up the build process. Limit locale
 854 # tweaks to this spot to avoid wrong language settings when running
 855 # make menuconfig etc.
 856 # Error messages still appears in the original language
 857
 858 PHONY += $(vmlinux-dirs)
 859 $(vmlinux-dirs): prepare scripts
 860         $(Q)$(MAKE) $(build)=$@
 861
 862 define filechk_kernel.release
 863         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 864 endef
 865
 866 # Store (new) KERNELRELEASE string in include/config/kernel.release
 867 include/config/kernel.release: include/config/auto.conf FORCE
 868         $(call filechk,kernel.release)
 869
 870
 871 # Things we need to do before we recursively start building the kernel
 872 # or the modules are listed in "prepare".
 873 # A multi level approach is used. prepareN is processed before prepareN-1.
 874 # archprepare is used in arch Makefiles and when processed asm symlink,
 875 # version.h and scripts_basic is processed / created.
 876
 877 # Listed in dependency order
 878 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 879
 880 # prepare3 is used to check if we are building in a separate output directory,
 881 # and if so do:
 882 # 1) Check that make has not been executed in the kernel src $(srctree)
 883 prepare3: include/config/kernel.release
 884 ifneq ($(KBUILD_SRC),)
 885         @$(kecho) '  Using $(srctree) as source for kernel'
 886         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 887                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 888                 echo >&2 "  in the '$(srctree)' directory.";\
 889                 /bin/false; \
 890         fi;
 891 endif
 892
 893 # prepare2 creates a makefile if using a separate output directory
 894 prepare2: prepare3 outputmakefile asm-generic
 895
 896 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 897                    include/config/auto.conf
 898         $(cmd_crmodverdir)
 899
 900 archprepare: archheaders archscripts prepare1 scripts_basic
 901
 902 prepare0: archprepare FORCE
 903         $(Q)$(MAKE) $(build)=.
 904
 905 # All the preparing..
 906 prepare: prepare0
 907
 908 # Generate some files
 909 # ---------------------------------------------------------------------------
 910
 911 # KERNELRELEASE can change from a few different places, meaning version.h
 912 # needs to be updated, so this check is forced on all builds
 913
 914 uts_len := 64
 915 define filechk_utsrelease.h
 916         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 917           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 918           exit 1;                                                         \
 919         fi;                                                               \
 920         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 921 endef
 922
 923 define filechk_version.h
 924         (echo \#define LINUX_VERSION_CODE $(shell                         \
 925         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 926         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 927 endef
 928
 929 $(version_h): $(srctree)/Makefile FORCE
 930         $(call filechk,version.h)
 931
 932 include/generated/utsrelease.h: include/config/kernel.release FORCE
 933         $(call filechk,utsrelease.h)
 934
 935 PHONY += headerdep
 936 headerdep:
 937         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 938         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 939
 940 # ---------------------------------------------------------------------------
 941
 942 PHONY += depend dep
 943 depend dep:
 944         @echo '*** Warning: make $@ is unnecessary now.'
 945
 946 # ---------------------------------------------------------------------------
 947 # Firmware install
 948 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 949 export INSTALL_FW_PATH
 950
 951 PHONY += firmware_install
 952 firmware_install: FORCE
 953         @mkdir -p $(objtree)/firmware
 954         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 955
 956 # ---------------------------------------------------------------------------
 957 # Kernel headers
 958
 959 #Default location for installed headers
 960 export INSTALL_HDR_PATH = $(objtree)/usr
 961
 962 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 963
 964 # If we do an all arch process set dst to asm-$(hdr-arch)
 965 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 966
 967 PHONY += archheaders
 968 archheaders:
 969
 970 PHONY += archscripts
 971 archscripts:
 972
 973 PHONY += __headers
 974 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
 975         $(Q)$(MAKE) $(build)=scripts build_unifdef
 976
 977 PHONY += headers_install_all
 978 headers_install_all:
 979         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
 980
 981 PHONY += headers_install
 982 headers_install: __headers
 983         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
 984           $(error Headers not exportable for the $(SRCARCH) architecture))
 985         $(Q)$(MAKE) $(hdr-inst)=include/uapi
 986         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
 987
 988 PHONY += headers_check_all
 989 headers_check_all: headers_install_all
 990         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
 991
 992 PHONY += headers_check
 993 headers_check: headers_install
 994         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
 995         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
 996
 997 # ---------------------------------------------------------------------------
 998 # Modules
 999
1000 ifdef CONFIG_MODULES
1001
1002 # By default, build modules as well
1003
1004 all: modules
1005
1006 #       Build modules
1007 #
1008 #       A module can be listed more than once in obj-m resulting in
1009 #       duplicate lines in modules.order files.  Those are removed
1010 #       using awk while concatenating to the final file.
1011
1012 PHONY += modules
1013 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1014         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1015         @$(kecho) '  Building modules, stage 2.';
1016         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1017         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1018
1019 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1020         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1021
1022 %/modules.builtin: include/config/auto.conf
1023         $(Q)$(MAKE) $(modbuiltin)=$*
1024
1025
1026 # Target to prepare building external modules
1027 PHONY += modules_prepare
1028 modules_prepare: prepare scripts
1029
1030 # Target to install modules
1031 PHONY += modules_install
1032 modules_install: _modinst_ _modinst_post
1033
1034 PHONY += _modinst_
1035 _modinst_:
1036         @rm -rf $(MODLIB)/kernel
1037         @rm -f $(MODLIB)/source
1038         @mkdir -p $(MODLIB)/kernel
1039         @ln -s $(srctree) $(MODLIB)/source
1040         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1041                 rm -f $(MODLIB)/build ; \
1042                 ln -s $(objtree) $(MODLIB)/build ; \
1043         fi
1044         @cp -f $(objtree)/modules.order $(MODLIB)/
1045         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1046         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1047
1048 # This depmod is only for convenience to give the initial
1049 # boot a modules.dep even before / is mounted read-write.  However the
1050 # boot script depmod is the master version.
1051 PHONY += _modinst_post
1052 _modinst_post: _modinst_
1053         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1054         $(call cmd,depmod)
1055
1056 ifeq ($(CONFIG_MODULE_SIG), y)
1057 PHONY += modules_sign
1058 modules_sign:
1059         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1060 endif
1061
1062 else # CONFIG_MODULES
1063
1064 # Modules not configured
1065 # ---------------------------------------------------------------------------
1066
1067 modules modules_install: FORCE
1068         @echo >&2
1069         @echo >&2 "The present kernel configuration has modules disabled."
1070         @echo >&2 "Type 'make config' and enable loadable module support."
1071         @echo >&2 "Then build a kernel with module support enabled."
1072         @echo >&2
1073         @exit 1
1074
1075 endif # CONFIG_MODULES
1076
1077 ###
1078 # Cleaning is done on three levels.
1079 # make clean     Delete most generated files
1080 #                Leave enough to build external modules
1081 # make mrproper  Delete the current configuration, and all generated files
1082 # make distclean Remove editor backup files, patch leftover files and the like
1083
1084 # Directories & files removed with 'make clean'
1085 CLEAN_DIRS  += $(MODVERDIR)
1086
1087 # Directories & files removed with 'make mrproper'
1088 MRPROPER_DIRS  += include/config usr/include include/generated          \
1089                   arch/*/include/generated
1090 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1091                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1092                   signing_key.priv signing_key.x509 x509.genkey         \
1093                   extra_certificates signing_key.x509.keyid             \
1094                   signing_key.x509.signer
1095
1096 # clean - Delete most, but leave enough to build external modules
1097 #
1098 clean: rm-dirs  := $(CLEAN_DIRS)
1099 clean: rm-files := $(CLEAN_FILES)
1100 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1101
1102 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1103 $(clean-dirs):
1104         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1105
1106 vmlinuxclean:
1107         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1108
1109 clean: archclean vmlinuxclean
1110
1111 # mrproper - Delete all generated files, including .config
1112 #
1113 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1114 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1115 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1116
1117 PHONY += $(mrproper-dirs) mrproper archmrproper
1118 $(mrproper-dirs):
1119         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1120
1121 mrproper: clean archmrproper $(mrproper-dirs)
1122         $(call cmd,rmdirs)
1123         $(call cmd,rmfiles)
1124
1125 # distclean
1126 #
1127 PHONY += distclean
1128
1129 distclean: mrproper
1130         @find $(srctree) $(RCS_FIND_IGNORE) \
1131                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1132                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1133                 -o -name '.*.rej' \
1134                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1135                 -type f -print | xargs rm -f
1136
1137
1138 # Packaging of the kernel to various formats
1139 # ---------------------------------------------------------------------------
1140 # rpm target kept for backward compatibility
1141 package-dir     := $(srctree)/scripts/package
1142
1143 %src-pkg: FORCE
1144         $(Q)$(MAKE) $(build)=$(package-dir) $@
1145 %pkg: include/config/kernel.release FORCE
1146         $(Q)$(MAKE) $(build)=$(package-dir) $@
1147 rpm: include/config/kernel.release FORCE
1148         $(Q)$(MAKE) $(build)=$(package-dir) $@
1149
1150
1151 # Brief documentation of the typical targets used
1152 # ---------------------------------------------------------------------------
1153
1154 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1155 boards := $(notdir $(boards))
1156 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1157 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1158
1159 help:
1160         @echo  'Cleaning targets:'
1161         @echo  '  clean           - Remove most generated files but keep the config and'
1162         @echo  '                    enough build support to build external modules'
1163         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1164         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1165         @echo  ''
1166         @echo  'Configuration targets:'
1167         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1168         @echo  ''
1169         @echo  'Other generic targets:'
1170         @echo  '  all             - Build all targets marked with [*]'
1171         @echo  '* vmlinux         - Build the bare kernel'
1172         @echo  '* modules         - Build all modules'
1173         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1174         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1175         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1176         @echo  '  dir/            - Build all files in dir and below'
1177         @echo  '  dir/file.[oisS] - Build specified target only'
1178         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1179         @echo  '                    (requires a recent binutils and recent build (System.map))'
1180         @echo  '  dir/file.ko     - Build module including final link'
1181         @echo  '  modules_prepare - Set up for building external modules'
1182         @echo  '  tags/TAGS       - Generate tags file for editors'
1183         @echo  '  cscope          - Generate cscope index'
1184         @echo  '  gtags           - Generate GNU GLOBAL index'
1185         @echo  '  kernelrelease   - Output the release version string'
1186         @echo  '  kernelversion   - Output the version stored in Makefile'
1187         @echo  '  image_name      - Output the image name'
1188         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1189          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1190          echo  ''
1191         @echo  'Static analysers'
1192         @echo  '  checkstack      - Generate a list of stack hogs'
1193         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1194         @echo  '  versioncheck    - Sanity check on version.h usage'
1195         @echo  '  includecheck    - Check for duplicate included header files'
1196         @echo  '  export_report   - List the usages of all exported symbols'
1197         @echo  '  headers_check   - Sanity check on exported headers'
1198         @echo  '  headerdep       - Detect inclusion cycles in headers'
1199         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1200         @echo  ''
1201         @echo  'Kernel packaging:'
1202         @$(MAKE) $(build)=$(package-dir) help
1203         @echo  ''
1204         @echo  'Documentation targets:'
1205         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1206         @echo  ''
1207         @echo  'Architecture specific targets ($(SRCARCH)):'
1208         @$(if $(archhelp),$(archhelp),\
1209                 echo '  No architecture specific help defined for $(SRCARCH)')
1210         @echo  ''
1211         @$(if $(boards), \
1212                 $(foreach b, $(boards), \
1213                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1214                 echo '')
1215         @$(if $(board-dirs), \
1216                 $(foreach b, $(board-dirs), \
1217                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1218                 printf "  %-16s - Show all of the above\\n" help-boards; \
1219                 echo '')
1220
1221         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1222         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1223         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1224         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1225         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1226         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1227         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1228         @echo  '                1: warnings which may be relevant and do not occur too often'
1229         @echo  '                2: warnings which occur quite often but may still be relevant'
1230         @echo  '                3: more obscure warnings, can most likely be ignored'
1231         @echo  '                Multiple levels can be combined with W=12 or W=123'
1232         @echo  ''
1233         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1234         @echo  'For further info see the ./README file'
1235
1236
1237 help-board-dirs := $(addprefix help-,$(board-dirs))
1238
1239 help-boards: $(help-board-dirs)
1240
1241 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1242
1243 $(help-board-dirs): help-%:
1244         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1245         @$(if $(boards-per-dir), \
1246                 $(foreach b, $(boards-per-dir), \
1247                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1248                 echo '')
1249
1250
1251 # Documentation targets
1252 # ---------------------------------------------------------------------------
1253 %docs: scripts_basic FORCE
1254         $(Q)$(MAKE) $(build)=scripts build_docproc
1255         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1256
1257 else # KBUILD_EXTMOD
1258
1259 ###
1260 # External module support.
1261 # When building external modules the kernel used as basis is considered
1262 # read-only, and no consistency checks are made and the make
1263 # system is not used on the basis kernel. If updates are required
1264 # in the basis kernel ordinary make commands (without M=...) must
1265 # be used.
1266 #
1267 # The following are the only valid targets when building external
1268 # modules.
1269 # make M=dir clean     Delete all automatically generated files
1270 # make M=dir modules   Make all modules in specified dir
1271 # make M=dir           Same as 'make M=dir modules'
1272 # make M=dir modules_install
1273 #                      Install the modules built in the module directory
1274 #                      Assumes install directory is already created
1275
1276 # We are always building modules
1277 KBUILD_MODULES := 1
1278 PHONY += crmodverdir
1279 crmodverdir:
1280         $(cmd_crmodverdir)
1281
1282 PHONY += $(objtree)/Module.symvers
1283 $(objtree)/Module.symvers:
1284         @test -e $(objtree)/Module.symvers || ( \
1285         echo; \
1286         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1287         echo "           is missing; modules will have no dependencies and modversions."; \
1288         echo )
1289
1290 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1291 PHONY += $(module-dirs) modules
1292 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1293         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1294
1295 modules: $(module-dirs)
1296         @$(kecho) '  Building modules, stage 2.';
1297         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1298
1299 PHONY += modules_install
1300 modules_install: _emodinst_ _emodinst_post
1301
1302 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1303 PHONY += _emodinst_
1304 _emodinst_:
1305         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1306         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1307
1308 PHONY += _emodinst_post
1309 _emodinst_post: _emodinst_
1310         $(call cmd,depmod)
1311
1312 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1313
1314 PHONY += $(clean-dirs) clean
1315 $(clean-dirs):
1316         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1317
1318 clean:  rm-dirs := $(MODVERDIR)
1319 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1320
1321 help:
1322         @echo  '  Building external modules.'
1323         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1324         @echo  ''
1325         @echo  '  modules         - default target, build the module(s)'
1326         @echo  '  modules_install - install the module'
1327         @echo  '  clean           - remove generated files in module directory only'
1328         @echo  ''
1329
1330 # Dummies...
1331 PHONY += prepare scripts
1332 prepare: ;
1333 scripts: ;
1334 endif # KBUILD_EXTMOD
1335
1336 clean: $(clean-dirs)
1337         $(call cmd,rmdirs)
1338         $(call cmd,rmfiles)
1339         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1340                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1341                 -o -name '*.ko.*' \
1342                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1343                 -o -name '*.symtypes' -o -name 'modules.order' \
1344                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1345                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1346
1347 # Generate tags for editors
1348 # ---------------------------------------------------------------------------
1349 quiet_cmd_tags = GEN     $@
1350       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1351
1352 tags TAGS cscope gtags: FORCE
1353         $(call cmd,tags)
1354
1355 # Scripts to check various things for consistency
1356 # ---------------------------------------------------------------------------
1357
1358 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1359
1360 includecheck:
1361         find $(srctree)/* $(RCS_FIND_IGNORE) \
1362                 -name '*.[hcS]' -type f -print | sort \
1363                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1364
1365 versioncheck:
1366         find $(srctree)/* $(RCS_FIND_IGNORE) \
1367                 -name '*.[hcS]' -type f -print | sort \
1368                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1369
1370 coccicheck:
1371         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1372
1373 namespacecheck:
1374         $(PERL) $(srctree)/scripts/namespace.pl
1375
1376 export_report:
1377         $(PERL) $(srctree)/scripts/export_report.pl
1378
1379 endif #ifeq ($(config-targets),1)
1380 endif #ifeq ($(mixed-targets),1)
1381
1382 PHONY += checkstack kernelrelease kernelversion image_name
1383
1384 # UML needs a little special treatment here.  It wants to use the host
1385 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1386 # else wants $(ARCH), including people doing cross-builds, which means
1387 # that $(SUBARCH) doesn't work here.
1388 ifeq ($(ARCH), um)
1389 CHECKSTACK_ARCH := $(SUBARCH)
1390 else
1391 CHECKSTACK_ARCH := $(ARCH)
1392 endif
1393 checkstack:
1394         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1395         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1396
1397 kernelrelease:
1398         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1399
1400 kernelversion:
1401         @echo $(KERNELVERSION)
1402
1403 image_name:
1404         @echo $(KBUILD_IMAGE)
1405
1406 # Clear a bunch of variables before executing the submake
1407 tools/: FORCE
1408         $(Q)mkdir -p $(objtree)/tools
1409         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1410
1411 tools/%: FORCE
1412         $(Q)mkdir -p $(objtree)/tools
1413         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1414
1415 # Single targets
1416 # ---------------------------------------------------------------------------
1417 # Single targets are compatible with:
1418 # - build with mixed source and output
1419 # - build with separate output dir 'make O=...'
1420 # - external modules
1421 #
1422 #  target-dir => where to store outputfile
1423 #  build-dir  => directory in kernel source tree to use
1424
1425 ifeq ($(KBUILD_EXTMOD),)
1426         build-dir  = $(patsubst %/,%,$(dir $@))
1427         target-dir = $(dir $@)
1428 else
1429         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1430         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1431         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1432 endif
1433
1434 %.s: %.c prepare scripts FORCE
1435         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1436 %.i: %.c prepare scripts FORCE
1437         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1438 %.o: %.c prepare scripts FORCE
1439         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1440 %.lst: %.c prepare scripts FORCE
1441         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1442 %.s: %.S prepare scripts FORCE
1443         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1444 %.o: %.S prepare scripts FORCE
1445         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1446 %.symtypes: %.c prepare scripts FORCE
1447         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1448
1449 # Modules
1450 /: prepare scripts FORCE
1451         $(cmd_crmodverdir)
1452         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1453         $(build)=$(build-dir)
1454 %/: prepare scripts FORCE
1455         $(cmd_crmodverdir)
1456         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1457         $(build)=$(build-dir)
1458 %.ko: prepare scripts FORCE
1459         $(cmd_crmodverdir)
1460         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1461         $(build)=$(build-dir) $(@:.ko=.o)
1462         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1463
1464 # FIXME Should go into a make.lib or something
1465 # ===========================================================================
1466
1467 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1468       cmd_rmdirs = rm -rf $(rm-dirs)
1469
1470 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1471       cmd_rmfiles = rm -f $(rm-files)
1472
1473 # Run depmod only if we have System.map and depmod is executable
1474 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1475       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1476                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1477
1478 # Create temporary dir for module support files
1479 # clean it up only when building all modules
1480 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1481                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1482
1483 # read all saved command lines
1484
1485 targets := $(wildcard $(sort $(targets)))
1486 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1487
1488 ifneq ($(cmd_files),)
1489   $(cmd_files): ;       # Do not try to update included dependency files
1490   include $(cmd_files)
1491 endif
1492
1493 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1494 # Usage:
1495 # $(Q)$(MAKE) $(clean)=dir
1496 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1497
1498 endif   # skip-makefile
1499
1500 PHONY += FORCE
1501 FORCE:
1502
1503 # Declare the contents of the .PHONY variable as phony.  We keep that
1504 # information in a variable so we can use it in if_changed and friends.
1505 .PHONY: $(PHONY)