Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 36
   4 EXTRAVERSION = -rc8
   5 NAME = Flesh-Eating Bats with Fangs
   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 # We are using a recursive build, so we need to do a little thinking
  26 # to get the ordering right.
  27 #
  28 # Most importantly: sub-Makefiles should only ever modify files in
  29 # their own directory. If in some directory we have a dependency on
  30 # a file in another dir (which doesn't happen often, but it's often
  31 # unavoidable when linking the built-in.o targets which finally
  32 # turn into vmlinux), we will call a sub make in that other dir, and
  33 # after that we are sure that everything which is in that other dir
  34 # is now up to date.
  35 #
  36 # The only cases where we need to modify files which have global
  37 # effects are thus separated out and done before the recursive
  38 # descending is started. They are now explicitly listed as the
  39 # prepare rule.
  40
  41 # To put more focus on warnings, be less verbose as default
  42 # Use 'make V=1' to see the full commands
  43
  44 ifeq ("$(origin V)", "command line")
  45   KBUILD_VERBOSE = $(V)
  46 endif
  47 ifndef KBUILD_VERBOSE
  48   KBUILD_VERBOSE = 0
  49 endif
  50
  51 # Call a source code checker (by default, "sparse") as part of the
  52 # C compilation.
  53 #
  54 # Use 'make C=1' to enable checking of only re-compiled files.
  55 # Use 'make C=2' to enable checking of *all* source files, regardless
  56 # of whether they are re-compiled or not.
  57 #
  58 # See the file "Documentation/sparse.txt" for more details, including
  59 # where to get the "sparse" utility.
  60
  61 ifeq ("$(origin C)", "command line")
  62   KBUILD_CHECKSRC = $(C)
  63 endif
  64 ifndef KBUILD_CHECKSRC
  65   KBUILD_CHECKSRC = 0
  66 endif
  67
  68 # Use make M=dir to specify directory of external module to build
  69 # Old syntax make ... SUBDIRS=$PWD is still supported
  70 # Setting the environment variable KBUILD_EXTMOD take precedence
  71 ifdef SUBDIRS
  72   KBUILD_EXTMOD ?= $(SUBDIRS)
  73 endif
  74
  75 ifeq ("$(origin M)", "command line")
  76   KBUILD_EXTMOD := $(M)
  77 endif
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(KBUILD_SRC),)
  98
  99 # OK, Make called in directory where kernel src resides
 100 # Do we want to locate output files in a separate directory?
 101 ifeq ("$(origin O)", "command line")
 102   KBUILD_OUTPUT := $(O)
 103 endif
 104
 105 # That's our default target when none is given on the command line
 106 PHONY := _all
 107 _all:
 108
 109 # Cancel implicit rules on top Makefile
 110 $(CURDIR)/Makefile Makefile: ;
 111
 112 ifneq ($(KBUILD_OUTPUT),)
 113 # Invoke a second make in the output directory, passing relevant variables
 114 # check that the output directory actually exists
 115 saved-output := $(KBUILD_OUTPUT)
 116 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 117 $(if $(KBUILD_OUTPUT),, \
 118      $(error output directory "$(saved-output)" does not exist))
 119
 120 PHONY += $(MAKECMDGOALS) sub-make
 121
 122 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 123         $(Q)@:
 124
 125 sub-make: FORCE
 126         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 127         KBUILD_SRC=$(CURDIR) \
 128         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 129         $(filter-out _all sub-make,$(MAKECMDGOALS))
 130
 131 # Leave processing to above invocation of make
 132 skip-makefile := 1
 133 endif # ifneq ($(KBUILD_OUTPUT),)
 134 endif # ifeq ($(KBUILD_SRC),)
 135
 136 # We process the rest of the Makefile if this is the final invocation of make
 137 ifeq ($(skip-makefile),)
 138
 139 # If building an external module we do not care about the all: rule
 140 # but instead _all depend on modules
 141 PHONY += all
 142 ifeq ($(KBUILD_EXTMOD),)
 143 _all: all
 144 else
 145 _all: modules
 146 endif
 147
 148 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 149 objtree         := $(CURDIR)
 150 src             := $(srctree)
 151 obj             := $(objtree)
 152
 153 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 154
 155 export srctree objtree VPATH
 156
 157
 158 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 159 # first, and if a usermode build is happening, the "ARCH=um" on the command
 160 # line overrides the setting of ARCH below.  If a native build is happening,
 161 # then ARCH is assigned, getting whatever value it gets normally, and
 162 # SUBARCH is subsequently ignored.
 163
 164 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 165                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 166                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 167                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 168                                   -e s/sh[234].*/sh/ )
 169
 170 # Cross compiling and selecting different set of gcc/bin-utils
 171 # ---------------------------------------------------------------------------
 172 #
 173 # When performing cross compilation for other architectures ARCH shall be set
 174 # to the target architecture. (See arch/* for the possibilities).
 175 # ARCH can be set during invocation of make:
 176 # make ARCH=ia64
 177 # Another way is to have ARCH set in the environment.
 178 # The default ARCH is the host where make is executed.
 179
 180 # CROSS_COMPILE specify the prefix used for all executables used
 181 # during compilation. Only gcc and related bin-utils executables
 182 # are prefixed with $(CROSS_COMPILE).
 183 # CROSS_COMPILE can be set on the command line
 184 # make CROSS_COMPILE=ia64-linux-
 185 # Alternatively CROSS_COMPILE can be set in the environment.
 186 # A third alternative is to store a setting in .config so that plain
 187 # "make" in the configured kernel build directory always uses that.
 188 # Default value for CROSS_COMPILE is not to prefix executables
 189 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 190 export KBUILD_BUILDHOST := $(SUBARCH)
 191 ARCH            ?= $(SUBARCH)
 192 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 193
 194 # Architecture as present in compile.h
 195 UTS_MACHINE     := $(ARCH)
 196 SRCARCH         := $(ARCH)
 197
 198 # Additional ARCH settings for x86
 199 ifeq ($(ARCH),i386)
 200         SRCARCH := x86
 201 endif
 202 ifeq ($(ARCH),x86_64)
 203         SRCARCH := x86
 204 endif
 205
 206 # Additional ARCH settings for sparc
 207 ifeq ($(ARCH),sparc64)
 208        SRCARCH := sparc
 209 endif
 210
 211 # Additional ARCH settings for sh
 212 ifeq ($(ARCH),sh64)
 213        SRCARCH := sh
 214 endif
 215
 216 # Where to locate arch specific headers
 217 hdr-arch  := $(SRCARCH)
 218
 219 ifeq ($(ARCH),m68knommu)
 220        hdr-arch  := m68k
 221 endif
 222
 223 KCONFIG_CONFIG  ?= .config
 224
 225 # SHELL used by kbuild
 226 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 227           else if [ -x /bin/bash ]; then echo /bin/bash; \
 228           else echo sh; fi ; fi)
 229
 230 HOSTCC       = gcc
 231 HOSTCXX      = g++
 232 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 233 HOSTCXXFLAGS = -O2
 234
 235 # Decide whether to build built-in, modular, or both.
 236 # Normally, just do built-in.
 237
 238 KBUILD_MODULES :=
 239 KBUILD_BUILTIN := 1
 240
 241 #       If we have only "make modules", don't compile built-in objects.
 242 #       When we're building modules with modversions, we need to consider
 243 #       the built-in objects during the descend as well, in order to
 244 #       make sure the checksums are up to date before we record them.
 245
 246 ifeq ($(MAKECMDGOALS),modules)
 247   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 248 endif
 249
 250 #       If we have "make <whatever> modules", compile modules
 251 #       in addition to whatever we do anyway.
 252 #       Just "make" or "make all" shall build modules as well
 253
 254 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 255   KBUILD_MODULES := 1
 256 endif
 257
 258 ifeq ($(MAKECMDGOALS),)
 259   KBUILD_MODULES := 1
 260 endif
 261
 262 export KBUILD_MODULES KBUILD_BUILTIN
 263 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 264
 265 # Beautify output
 266 # ---------------------------------------------------------------------------
 267 #
 268 # Normally, we echo the whole command before executing it. By making
 269 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 270 # $(quiet) to choose other forms of output instead, e.g.
 271 #
 272 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 273 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 274 #
 275 # If $(quiet) is empty, the whole command will be printed.
 276 # If it is set to "quiet_", only the short version will be printed.
 277 # If it is set to "silent_", nothing will be printed at all, since
 278 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 279 #
 280 # A simple variant is to prefix commands with $(Q) - that's useful
 281 # for commands that shall be hidden in non-verbose mode.
 282 #
 283 #       $(Q)ln $@ :<
 284 #
 285 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 286 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 287
 288 ifeq ($(KBUILD_VERBOSE),1)
 289   quiet =
 290   Q =
 291 else
 292   quiet=quiet_
 293   Q = @
 294 endif
 295
 296 # If the user is running make -s (silent mode), suppress echoing of
 297 # commands
 298
 299 ifneq ($(findstring s,$(MAKEFLAGS)),)
 300   quiet=silent_
 301 endif
 302
 303 export quiet Q KBUILD_VERBOSE
 304
 305
 306 # Look for make include files relative to root of kernel src
 307 MAKEFLAGS += --include-dir=$(srctree)
 308
 309 # We need some generic definitions (do not try to remake the file).
 310 $(srctree)/scripts/Kbuild.include: ;
 311 include $(srctree)/scripts/Kbuild.include
 312
 313 # Make variables (CC, etc...)
 314
 315 AS              = $(CROSS_COMPILE)as
 316 LD              = $(CROSS_COMPILE)ld
 317 CC              = $(CROSS_COMPILE)gcc
 318 CPP             = $(CC) -E
 319 AR              = $(CROSS_COMPILE)ar
 320 NM              = $(CROSS_COMPILE)nm
 321 STRIP           = $(CROSS_COMPILE)strip
 322 OBJCOPY         = $(CROSS_COMPILE)objcopy
 323 OBJDUMP         = $(CROSS_COMPILE)objdump
 324 AWK             = awk
 325 GENKSYMS        = scripts/genksyms/genksyms
 326 INSTALLKERNEL  := installkernel
 327 DEPMOD          = /sbin/depmod
 328 KALLSYMS        = scripts/kallsyms
 329 PERL            = perl
 330 CHECK           = sparse
 331
 332 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 333                   -Wbitwise -Wno-return-void $(CF)
 334 CFLAGS_MODULE   =
 335 AFLAGS_MODULE   =
 336 LDFLAGS_MODULE  =
 337 CFLAGS_KERNEL   =
 338 AFLAGS_KERNEL   =
 339 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 340
 341
 342 # Use LINUXINCLUDE when you must reference the include/ directory.
 343 # Needed to be compatible with the O= option
 344 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 345                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 346                    -include include/generated/autoconf.h
 347
 348 KBUILD_CPPFLAGS := -D__KERNEL__
 349
 350 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 351                    -fno-strict-aliasing -fno-common \
 352                    -Werror-implicit-function-declaration \
 353                    -Wno-format-security \
 354                    -fno-delete-null-pointer-checks
 355 KBUILD_AFLAGS_KERNEL :=
 356 KBUILD_CFLAGS_KERNEL :=
 357 KBUILD_AFLAGS   := -D__ASSEMBLY__
 358 KBUILD_AFLAGS_MODULE  := -DMODULE
 359 KBUILD_CFLAGS_MODULE  := -DMODULE
 360 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 361
 362 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 363 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 364 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 365
 366 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 367 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 368 export CPP AR NM STRIP OBJCOPY OBJDUMP
 369 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 370 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 371
 372 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 373 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 374 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 375 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 376 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 377
 378 # When compiling out-of-tree modules, put MODVERDIR in the module
 379 # tree rather than in the kernel tree. The kernel tree might
 380 # even be read-only.
 381 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 382
 383 # Files to ignore in find ... statements
 384
 385 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 386 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 387
 388 # ===========================================================================
 389 # Rules shared between *config targets and build targets
 390
 391 # Basic helpers built in scripts/
 392 PHONY += scripts_basic
 393 scripts_basic:
 394         $(Q)$(MAKE) $(build)=scripts/basic
 395         $(Q)rm -f .tmp_quiet_recordmcount
 396
 397 # To avoid any implicit rule to kick in, define an empty command.
 398 scripts/basic/%: scripts_basic ;
 399
 400 PHONY += outputmakefile
 401 # outputmakefile generates a Makefile in the output directory, if using a
 402 # separate output directory. This allows convenient use of make in the
 403 # output directory.
 404 outputmakefile:
 405 ifneq ($(KBUILD_SRC),)
 406         $(Q)ln -fsn $(srctree) source
 407         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 408             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 409 endif
 410
 411 # To make sure we do not include .config for any of the *config targets
 412 # catch them early, and hand them over to scripts/kconfig/Makefile
 413 # It is allowed to specify more targets when calling make, including
 414 # mixing *config targets and build targets.
 415 # For example 'make oldconfig all'.
 416 # Detect when mixed targets is specified, and make a second invocation
 417 # of make so .config is not included in this case either (for *config).
 418
 419 no-dot-config-targets := clean mrproper distclean \
 420                          cscope TAGS tags help %docs check% coccicheck \
 421                          include/linux/version.h headers_% \
 422                          kernelversion %src-pkg
 423
 424 config-targets := 0
 425 mixed-targets  := 0
 426 dot-config     := 1
 427
 428 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 429         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 430                 dot-config := 0
 431         endif
 432 endif
 433
 434 ifeq ($(KBUILD_EXTMOD),)
 435         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 436                 config-targets := 1
 437                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 438                         mixed-targets := 1
 439                 endif
 440         endif
 441 endif
 442
 443 ifeq ($(mixed-targets),1)
 444 # ===========================================================================
 445 # We're called with mixed targets (*config and build targets).
 446 # Handle them one by one.
 447
 448 %:: FORCE
 449         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 450
 451 else
 452 ifeq ($(config-targets),1)
 453 # ===========================================================================
 454 # *config targets only - make sure prerequisites are updated, and descend
 455 # in scripts/kconfig to make the *config target
 456
 457 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 458 # KBUILD_DEFCONFIG may point out an alternative default configuration
 459 # used for 'make defconfig'
 460 include $(srctree)/arch/$(SRCARCH)/Makefile
 461 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 462
 463 config: scripts_basic outputmakefile FORCE
 464         $(Q)mkdir -p include/linux include/config
 465         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 466
 467 %config: scripts_basic outputmakefile FORCE
 468         $(Q)mkdir -p include/linux include/config
 469         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 470
 471 else
 472 # ===========================================================================
 473 # Build targets only - this includes vmlinux, arch specific targets, clean
 474 # targets and others. In general all targets except *config targets.
 475
 476 ifeq ($(KBUILD_EXTMOD),)
 477 # Additional helpers built in scripts/
 478 # Carefully list dependencies so we do not try to build scripts twice
 479 # in parallel
 480 PHONY += scripts
 481 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 482         $(Q)$(MAKE) $(build)=$(@)
 483
 484 # Objects we will link into vmlinux / subdirs we need to visit
 485 init-y          := init/
 486 drivers-y       := drivers/ sound/ firmware/
 487 net-y           := net/
 488 libs-y          := lib/
 489 core-y          := usr/
 490 endif # KBUILD_EXTMOD
 491
 492 ifeq ($(dot-config),1)
 493 # Read in config
 494 -include include/config/auto.conf
 495
 496 ifeq ($(KBUILD_EXTMOD),)
 497 # Read in dependencies to all Kconfig* files, make sure to run
 498 # oldconfig if changes are detected.
 499 -include include/config/auto.conf.cmd
 500
 501 # To avoid any implicit rule to kick in, define an empty command
 502 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 503
 504 # If .config is newer than include/config/auto.conf, someone tinkered
 505 # with it and forgot to run make oldconfig.
 506 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 507 # we execute the config step to be sure to catch updated Kconfig files
 508 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 509         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 510 else
 511 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 512 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 513 PHONY += include/config/auto.conf
 514
 515 include/config/auto.conf:
 516         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 517         echo;                                                           \
 518         echo "  ERROR: Kernel configuration is invalid.";               \
 519         echo "         include/generated/autoconf.h or $@ are missing.";\
 520         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 521         echo;                                                           \
 522         /bin/false)
 523
 524 endif # KBUILD_EXTMOD
 525
 526 else
 527 # Dummy target needed, because used as prerequisite
 528 include/config/auto.conf: ;
 529 endif # $(dot-config)
 530
 531 # The all: target is the default when no target is given on the
 532 # command line.
 533 # This allow a user to issue only 'make' to build a kernel including modules
 534 # Defaults to vmlinux, but the arch makefile usually adds further targets
 535 all: vmlinux
 536
 537 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 538 KBUILD_CFLAGS   += -Os
 539 else
 540 KBUILD_CFLAGS   += -O2
 541 endif
 542
 543 include $(srctree)/arch/$(SRCARCH)/Makefile
 544
 545 ifneq ($(CONFIG_FRAME_WARN),0)
 546 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 547 endif
 548
 549 # Force gcc to behave correct even for buggy distributions
 550 ifndef CONFIG_CC_STACKPROTECTOR
 551 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 552 endif
 553
 554 ifdef CONFIG_FRAME_POINTER
 555 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 556 else
 557 # Some targets (ARM with Thumb2, for example), can't be built with frame
 558 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 559 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 560 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 561 # -fomit-frame-pointer with FUNCTION_TRACER.
 562 ifndef CONFIG_FUNCTION_TRACER
 563 KBUILD_CFLAGS   += -fomit-frame-pointer
 564 endif
 565 endif
 566
 567 ifdef CONFIG_DEBUG_INFO
 568 KBUILD_CFLAGS   += -g
 569 KBUILD_AFLAGS   += -gdwarf-2
 570 endif
 571
 572 ifdef CONFIG_DEBUG_INFO_REDUCED
 573 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 574 endif
 575
 576 ifdef CONFIG_FUNCTION_TRACER
 577 KBUILD_CFLAGS   += -pg
 578 endif
 579
 580 # We trigger additional mismatches with less inlining
 581 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 582 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 583 endif
 584
 585 # arch Makefile may override CC so keep this after arch Makefile is included
 586 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 587 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 588
 589 # warn about C99 declaration after statement
 590 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 591
 592 # disable pointer signed / unsigned warnings in gcc 4.0
 593 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 594
 595 # disable invalid "can't wrap" optimizations for signed / pointers
 596 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 597
 598 # conserve stack if available
 599 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 600
 601 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 602 # But warn user when we do so
 603 warn-assign = \
 604 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 605
 606 ifneq ($(KCPPFLAGS),)
 607         $(call warn-assign,CPPFLAGS)
 608         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 609 endif
 610 ifneq ($(KAFLAGS),)
 611         $(call warn-assign,AFLAGS)
 612         KBUILD_AFLAGS += $(KAFLAGS)
 613 endif
 614 ifneq ($(KCFLAGS),)
 615         $(call warn-assign,CFLAGS)
 616         KBUILD_CFLAGS += $(KCFLAGS)
 617 endif
 618
 619 # Use --build-id when available.
 620 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 621                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 622 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 623 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 624
 625 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 626 LDFLAGS_vmlinux += $(call ld-option, -X,)
 627 endif
 628
 629 # Default kernel image to build when no specific target is given.
 630 # KBUILD_IMAGE may be overruled on the command line or
 631 # set in the environment
 632 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 633 # this default value
 634 export KBUILD_IMAGE ?= vmlinux
 635
 636 #
 637 # INSTALL_PATH specifies where to place the updated kernel and system map
 638 # images. Default is /boot, but you can set it to other values
 639 export  INSTALL_PATH ?= /boot
 640
 641 #
 642 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 643 # relocations required by build roots.  This is not defined in the
 644 # makefile but the argument can be passed to make if needed.
 645 #
 646
 647 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 648 export MODLIB
 649
 650 #
 651 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 652 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 653 #  the default option --strip-debug will be used.  Otherwise,
 654 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 655
 656 ifdef INSTALL_MOD_STRIP
 657 ifeq ($(INSTALL_MOD_STRIP),1)
 658 mod_strip_cmd = $(STRIP) --strip-debug
 659 else
 660 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 661 endif # INSTALL_MOD_STRIP=1
 662 else
 663 mod_strip_cmd = true
 664 endif # INSTALL_MOD_STRIP
 665 export mod_strip_cmd
 666
 667
 668 ifeq ($(KBUILD_EXTMOD),)
 669 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 670
 671 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 672                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 673                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 674
 675 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 676                      $(init-n) $(init-) \
 677                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 678                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 679
 680 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 681 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 682 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 683 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 684 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 685 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 686 libs-y          := $(libs-y1) $(libs-y2)
 687
 688 # Build vmlinux
 689 # ---------------------------------------------------------------------------
 690 # vmlinux is built from the objects selected by $(vmlinux-init) and
 691 # $(vmlinux-main). Most are built-in.o files from top-level directories
 692 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 693 # Ordering when linking is important, and $(vmlinux-init) must be first.
 694 #
 695 # vmlinux
 696 #   ^
 697 #   |
 698 #   +-< $(vmlinux-init)
 699 #   |   +--< init/version.o + more
 700 #   |
 701 #   +--< $(vmlinux-main)
 702 #   |    +--< driver/built-in.o mm/built-in.o + more
 703 #   |
 704 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 705 #
 706 # vmlinux version (uname -v) cannot be updated during normal
 707 # descending-into-subdirs phase since we do not yet know if we need to
 708 # update vmlinux.
 709 # Therefore this step is delayed until just before final link of vmlinux -
 710 # except in the kallsyms case where it is done just before adding the
 711 # symbols to the kernel.
 712 #
 713 # System.map is generated to document addresses of all kernel symbols
 714
 715 vmlinux-init := $(head-y) $(init-y)
 716 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 717 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 718 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 719 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 720
 721 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 722 # May be overridden by arch/$(ARCH)/Makefile
 723 quiet_cmd_vmlinux__ ?= LD      $@
 724       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 725       -T $(vmlinux-lds) $(vmlinux-init)                          \
 726       --start-group $(vmlinux-main) --end-group                  \
 727       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 728
 729 # Generate new vmlinux version
 730 quiet_cmd_vmlinux_version = GEN     .version
 731       cmd_vmlinux_version = set -e;                     \
 732         if [ ! -r .version ]; then                      \
 733           rm -f .version;                               \
 734           echo 1 >.version;                             \
 735         else                                            \
 736           mv .version .old_version;                     \
 737           expr 0$$(cat .old_version) + 1 >.version;     \
 738         fi;                                             \
 739         $(MAKE) $(build)=init
 740
 741 # Generate System.map
 742 quiet_cmd_sysmap = SYSMAP
 743       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 744
 745 # Link of vmlinux
 746 # If CONFIG_KALLSYMS is set .version is already updated
 747 # Generate System.map and verify that the content is consistent
 748 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 749 # First command is ':' to allow us to use + in front of the rule
 750 define rule_vmlinux__
 751         :
 752         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 753
 754         $(call cmd,vmlinux__)
 755         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 756
 757         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 758           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 759         $(cmd_sysmap) $@ System.map;                                         \
 760         if [ $$? -ne 0 ]; then                                               \
 761                 rm -f $@;                                                    \
 762                 /bin/false;                                                  \
 763         fi;
 764         $(verify_kallsyms)
 765 endef
 766
 767
 768 ifdef CONFIG_KALLSYMS
 769 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 770 # It's a three stage process:
 771 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 772 #   empty
 773 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 774 #   the right size - vmlinux version (uname -v) is updated during this step
 775 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 776 #   but due to the added section, some addresses have shifted.
 777 #   From here, we generate a correct .tmp_kallsyms2.o
 778 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 779 # o Verify that the System.map from vmlinux matches the map from
 780 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 781 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 782 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 783 #   temporary bypass to allow the kernel to be built while the
 784 #   maintainers work out what went wrong with kallsyms.
 785
 786 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 787 last_kallsyms := 3
 788 else
 789 last_kallsyms := 2
 790 endif
 791
 792 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 793
 794 define verify_kallsyms
 795         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 796           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 797           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 798         $(Q)cmp -s System.map .tmp_System.map ||                             \
 799                 (echo Inconsistent kallsyms data;                            \
 800                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 801                  rm .tmp_kallsyms* ; /bin/false )
 802 endef
 803
 804 # Update vmlinux version before link
 805 # Use + in front of this rule to silent warning about make -j1
 806 # First command is ':' to allow us to use + in front of this rule
 807 cmd_ksym_ld = $(cmd_vmlinux__)
 808 define rule_ksym_ld
 809         :
 810         +$(call cmd,vmlinux_version)
 811         $(call cmd,vmlinux__)
 812         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 813 endef
 814
 815 # Generate .S file with all kernel symbols
 816 quiet_cmd_kallsyms = KSYM    $@
 817       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 818                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 819
 820 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 821         $(call if_changed_dep,as_o_S)
 822
 823 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 824         $(call cmd,kallsyms)
 825
 826 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 827 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 828         $(call if_changed_rule,ksym_ld)
 829
 830 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 831         $(call if_changed,vmlinux__)
 832
 833 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 834         $(call if_changed,vmlinux__)
 835
 836 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 837 $(KALLSYMS): scripts ;
 838
 839 # Generate some data for debugging strange kallsyms problems
 840 debug_kallsyms: .tmp_map$(last_kallsyms)
 841
 842 .tmp_map%: .tmp_vmlinux% FORCE
 843         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 844
 845 .tmp_map3: .tmp_map2
 846
 847 .tmp_map2: .tmp_map1
 848
 849 endif # ifdef CONFIG_KALLSYMS
 850
 851 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 852 # relevant sections renamed as per the linker script.
 853 quiet_cmd_vmlinux-modpost = LD      $@
 854       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 855          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 856          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 857 define rule_vmlinux-modpost
 858         :
 859         +$(call cmd,vmlinux-modpost)
 860         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 861         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 862 endef
 863
 864 # vmlinux image - including updated kernel symbols
 865 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 866 ifdef CONFIG_HEADERS_CHECK
 867         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 868 endif
 869 ifdef CONFIG_SAMPLES
 870         $(Q)$(MAKE) $(build)=samples
 871 endif
 872 ifdef CONFIG_BUILD_DOCSRC
 873         $(Q)$(MAKE) $(build)=Documentation
 874 endif
 875         $(call vmlinux-modpost)
 876         $(call if_changed_rule,vmlinux__)
 877         $(Q)rm -f .old_version
 878
 879 # build vmlinux.o first to catch section mismatch errors early
 880 ifdef CONFIG_KALLSYMS
 881 .tmp_vmlinux1: vmlinux.o
 882 endif
 883
 884 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 885 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 886         $(call if_changed_rule,vmlinux-modpost)
 887
 888 # The actual objects are generated when descending,
 889 # make sure no implicit rule kicks in
 890 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 891
 892 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 893 # Preset locale variables to speed up the build process. Limit locale
 894 # tweaks to this spot to avoid wrong language settings when running
 895 # make menuconfig etc.
 896 # Error messages still appears in the original language
 897
 898 PHONY += $(vmlinux-dirs)
 899 $(vmlinux-dirs): prepare scripts
 900         $(Q)$(MAKE) $(build)=$@
 901
 902 # Store (new) KERNELRELASE string in include/config/kernel.release
 903 include/config/kernel.release: include/config/auto.conf FORCE
 904         $(Q)rm -f $@
 905         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 906
 907
 908 # Things we need to do before we recursively start building the kernel
 909 # or the modules are listed in "prepare".
 910 # A multi level approach is used. prepareN is processed before prepareN-1.
 911 # archprepare is used in arch Makefiles and when processed asm symlink,
 912 # version.h and scripts_basic is processed / created.
 913
 914 # Listed in dependency order
 915 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 916
 917 # prepare3 is used to check if we are building in a separate output directory,
 918 # and if so do:
 919 # 1) Check that make has not been executed in the kernel src $(srctree)
 920 prepare3: include/config/kernel.release
 921 ifneq ($(KBUILD_SRC),)
 922         @$(kecho) '  Using $(srctree) as source for kernel'
 923         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 924                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 925                 echo "  in the '$(srctree)' directory.";\
 926                 /bin/false; \
 927         fi;
 928 endif
 929
 930 # prepare2 creates a makefile if using a separate output directory
 931 prepare2: prepare3 outputmakefile
 932
 933 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 934                    include/config/auto.conf
 935         $(cmd_crmodverdir)
 936
 937 archprepare: prepare1 scripts_basic
 938
 939 prepare0: archprepare FORCE
 940         $(Q)$(MAKE) $(build)=.
 941         $(Q)$(MAKE) $(build)=. missing-syscalls
 942
 943 # All the preparing..
 944 prepare: prepare0
 945
 946 # Generate some files
 947 # ---------------------------------------------------------------------------
 948
 949 # KERNELRELEASE can change from a few different places, meaning version.h
 950 # needs to be updated, so this check is forced on all builds
 951
 952 uts_len := 64
 953 define filechk_utsrelease.h
 954         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 955           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 956           exit 1;                                                         \
 957         fi;                                                               \
 958         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 959 endef
 960
 961 define filechk_version.h
 962         (echo \#define LINUX_VERSION_CODE $(shell                             \
 963         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 964         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 965 endef
 966
 967 include/linux/version.h: $(srctree)/Makefile FORCE
 968         $(call filechk,version.h)
 969
 970 include/generated/utsrelease.h: include/config/kernel.release FORCE
 971         $(call filechk,utsrelease.h)
 972
 973 PHONY += headerdep
 974 headerdep:
 975         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
 976
 977 # ---------------------------------------------------------------------------
 978
 979 PHONY += depend dep
 980 depend dep:
 981         @echo '*** Warning: make $@ is unnecessary now.'
 982
 983 # ---------------------------------------------------------------------------
 984 # Firmware install
 985 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 986 export INSTALL_FW_PATH
 987
 988 PHONY += firmware_install
 989 firmware_install: FORCE
 990         @mkdir -p $(objtree)/firmware
 991         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 992
 993 # ---------------------------------------------------------------------------
 994 # Kernel headers
 995
 996 #Default location for installed headers
 997 export INSTALL_HDR_PATH = $(objtree)/usr
 998
 999 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1000
1001 # If we do an all arch process set dst to asm-$(hdr-arch)
1002 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1003
1004 PHONY += __headers
1005 __headers: include/linux/version.h scripts_basic FORCE
1006         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1007
1008 PHONY += headers_install_all
1009 headers_install_all:
1010         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1011
1012 PHONY += headers_install
1013 headers_install: __headers
1014         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1015         $(error Headers not exportable for the $(SRCARCH) architecture))
1016         $(Q)$(MAKE) $(hdr-inst)=include
1017         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1018
1019 PHONY += headers_check_all
1020 headers_check_all: headers_install_all
1021         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1022
1023 PHONY += headers_check
1024 headers_check: headers_install
1025         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1026         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1027
1028 # ---------------------------------------------------------------------------
1029 # Modules
1030
1031 ifdef CONFIG_MODULES
1032
1033 # By default, build modules as well
1034
1035 all: modules
1036
1037 #       Build modules
1038 #
1039 #       A module can be listed more than once in obj-m resulting in
1040 #       duplicate lines in modules.order files.  Those are removed
1041 #       using awk while concatenating to the final file.
1042
1043 PHONY += modules
1044 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1045         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1046         @$(kecho) '  Building modules, stage 2.';
1047         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1048         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1049
1050 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1051         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1052
1053 %/modules.builtin: include/config/auto.conf
1054         $(Q)$(MAKE) $(modbuiltin)=$*
1055
1056
1057 # Target to prepare building external modules
1058 PHONY += modules_prepare
1059 modules_prepare: prepare scripts
1060
1061 # Target to install modules
1062 PHONY += modules_install
1063 modules_install: _modinst_ _modinst_post
1064
1065 PHONY += _modinst_
1066 _modinst_:
1067         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1068                 echo "Warning: you may need to install module-init-tools"; \
1069                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1070                 sleep 1; \
1071         fi
1072         @rm -rf $(MODLIB)/kernel
1073         @rm -f $(MODLIB)/source
1074         @mkdir -p $(MODLIB)/kernel
1075         @ln -s $(srctree) $(MODLIB)/source
1076         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1077                 rm -f $(MODLIB)/build ; \
1078                 ln -s $(objtree) $(MODLIB)/build ; \
1079         fi
1080         @cp -f $(objtree)/modules.order $(MODLIB)/
1081         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1082         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1083
1084 # This depmod is only for convenience to give the initial
1085 # boot a modules.dep even before / is mounted read-write.  However the
1086 # boot script depmod is the master version.
1087 PHONY += _modinst_post
1088 _modinst_post: _modinst_
1089         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1090         $(call cmd,depmod)
1091
1092 else # CONFIG_MODULES
1093
1094 # Modules not configured
1095 # ---------------------------------------------------------------------------
1096
1097 modules modules_install: FORCE
1098         @echo
1099         @echo "The present kernel configuration has modules disabled."
1100         @echo "Type 'make config' and enable loadable module support."
1101         @echo "Then build a kernel with module support enabled."
1102         @echo
1103         @exit 1
1104
1105 endif # CONFIG_MODULES
1106
1107 ###
1108 # Cleaning is done on three levels.
1109 # make clean     Delete most generated files
1110 #                Leave enough to build external modules
1111 # make mrproper  Delete the current configuration, and all generated files
1112 # make distclean Remove editor backup files, patch leftover files and the like
1113
1114 # Directories & files removed with 'make clean'
1115 CLEAN_DIRS  += $(MODVERDIR)
1116 CLEAN_FILES +=  vmlinux System.map \
1117                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1118
1119 # Directories & files removed with 'make mrproper'
1120 MRPROPER_DIRS  += include/config usr/include include/generated
1121 MRPROPER_FILES += .config .config.old .version .old_version             \
1122                   include/linux/version.h                               \
1123                   Module.symvers tags TAGS cscope*
1124
1125 # clean - Delete most, but leave enough to build external modules
1126 #
1127 clean: rm-dirs  := $(CLEAN_DIRS)
1128 clean: rm-files := $(CLEAN_FILES)
1129 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1130
1131 PHONY += $(clean-dirs) clean archclean
1132 $(clean-dirs):
1133         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1134
1135 clean: archclean $(clean-dirs)
1136         $(call cmd,rmdirs)
1137         $(call cmd,rmfiles)
1138         @find . $(RCS_FIND_IGNORE) \
1139                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1140                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1141                 -o -name '*.symtypes' -o -name 'modules.order' \
1142                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1143                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1144
1145 # mrproper - Delete all generated files, including .config
1146 #
1147 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1148 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1149 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1150
1151 PHONY += $(mrproper-dirs) mrproper archmrproper
1152 $(mrproper-dirs):
1153         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1154
1155 mrproper: clean archmrproper $(mrproper-dirs)
1156         $(call cmd,rmdirs)
1157         $(call cmd,rmfiles)
1158
1159 # distclean
1160 #
1161 PHONY += distclean
1162
1163 distclean: mrproper
1164         @find $(srctree) $(RCS_FIND_IGNORE) \
1165                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1166                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1167                 -o -name '.*.rej' -o -size 0 \
1168                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1169                 -type f -print | xargs rm -f
1170
1171
1172 # Packaging of the kernel to various formats
1173 # ---------------------------------------------------------------------------
1174 # rpm target kept for backward compatibility
1175 package-dir     := $(srctree)/scripts/package
1176
1177 %src-pkg: FORCE
1178         $(Q)$(MAKE) $(build)=$(package-dir) $@
1179 %pkg: include/config/kernel.release FORCE
1180         $(Q)$(MAKE) $(build)=$(package-dir) $@
1181 rpm: include/config/kernel.release FORCE
1182         $(Q)$(MAKE) $(build)=$(package-dir) $@
1183
1184
1185 # Brief documentation of the typical targets used
1186 # ---------------------------------------------------------------------------
1187
1188 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1189 boards := $(notdir $(boards))
1190 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1191 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1192
1193 help:
1194         @echo  'Cleaning targets:'
1195         @echo  '  clean           - Remove most generated files but keep the config and'
1196         @echo  '                    enough build support to build external modules'
1197         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1198         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1199         @echo  ''
1200         @echo  'Configuration targets:'
1201         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1202         @echo  ''
1203         @echo  'Other generic targets:'
1204         @echo  '  all             - Build all targets marked with [*]'
1205         @echo  '* vmlinux         - Build the bare kernel'
1206         @echo  '* modules         - Build all modules'
1207         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1208         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1209         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1210         @echo  '  dir/            - Build all files in dir and below'
1211         @echo  '  dir/file.[oisS] - Build specified target only'
1212         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1213         @echo  '                    (requires a recent binutils and recent build (System.map))'
1214         @echo  '  dir/file.ko     - Build module including final link'
1215         @echo  '  modules_prepare - Set up for building external modules'
1216         @echo  '  tags/TAGS       - Generate tags file for editors'
1217         @echo  '  cscope          - Generate cscope index'
1218         @echo  '  kernelrelease   - Output the release version string'
1219         @echo  '  kernelversion   - Output the version stored in Makefile'
1220         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1221          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1222          echo  ''
1223         @echo  'Static analysers'
1224         @echo  '  checkstack      - Generate a list of stack hogs'
1225         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1226         @echo  '  versioncheck    - Sanity check on version.h usage'
1227         @echo  '  includecheck    - Check for duplicate included header files'
1228         @echo  '  export_report   - List the usages of all exported symbols'
1229         @echo  '  headers_check   - Sanity check on exported headers'
1230         @echo  '  headerdep       - Detect inclusion cycles in headers'
1231         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1232         @echo  ''
1233         @echo  'Kernel packaging:'
1234         @$(MAKE) $(build)=$(package-dir) help
1235         @echo  ''
1236         @echo  'Documentation targets:'
1237         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1238         @echo  ''
1239         @echo  'Architecture specific targets ($(SRCARCH)):'
1240         @$(if $(archhelp),$(archhelp),\
1241                 echo '  No architecture specific help defined for $(SRCARCH)')
1242         @echo  ''
1243         @$(if $(boards), \
1244                 $(foreach b, $(boards), \
1245                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1246                 echo '')
1247         @$(if $(board-dirs), \
1248                 $(foreach b, $(board-dirs), \
1249                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1250                 printf "  %-16s - Show all of the above\\n" help-boards; \
1251                 echo '')
1252
1253         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1254         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1255         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1256         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1257         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1258         @echo  ''
1259         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1260         @echo  'For further info see the ./README file'
1261
1262
1263 help-board-dirs := $(addprefix help-,$(board-dirs))
1264
1265 help-boards: $(help-board-dirs)
1266
1267 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1268
1269 $(help-board-dirs): help-%:
1270         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1271         @$(if $(boards-per-dir), \
1272                 $(foreach b, $(boards-per-dir), \
1273                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1274                 echo '')
1275
1276
1277 # Documentation targets
1278 # ---------------------------------------------------------------------------
1279 %docs: scripts_basic FORCE
1280         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1281
1282 else # KBUILD_EXTMOD
1283
1284 ###
1285 # External module support.
1286 # When building external modules the kernel used as basis is considered
1287 # read-only, and no consistency checks are made and the make
1288 # system is not used on the basis kernel. If updates are required
1289 # in the basis kernel ordinary make commands (without M=...) must
1290 # be used.
1291 #
1292 # The following are the only valid targets when building external
1293 # modules.
1294 # make M=dir clean     Delete all automatically generated files
1295 # make M=dir modules   Make all modules in specified dir
1296 # make M=dir           Same as 'make M=dir modules'
1297 # make M=dir modules_install
1298 #                      Install the modules built in the module directory
1299 #                      Assumes install directory is already created
1300
1301 # We are always building modules
1302 KBUILD_MODULES := 1
1303 PHONY += crmodverdir
1304 crmodverdir:
1305         $(cmd_crmodverdir)
1306
1307 PHONY += $(objtree)/Module.symvers
1308 $(objtree)/Module.symvers:
1309         @test -e $(objtree)/Module.symvers || ( \
1310         echo; \
1311         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1312         echo "           is missing; modules will have no dependencies and modversions."; \
1313         echo )
1314
1315 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1316 PHONY += $(module-dirs) modules
1317 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1318         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1319
1320 modules: $(module-dirs)
1321         @$(kecho) '  Building modules, stage 2.';
1322         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1323
1324 PHONY += modules_install
1325 modules_install: _emodinst_ _emodinst_post
1326
1327 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1328 PHONY += _emodinst_
1329 _emodinst_:
1330         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1331         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1332
1333 PHONY += _emodinst_post
1334 _emodinst_post: _emodinst_
1335         $(call cmd,depmod)
1336
1337 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1338
1339 PHONY += $(clean-dirs) clean
1340 $(clean-dirs):
1341         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1342
1343 clean:  rm-dirs := $(MODVERDIR)
1344 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1345                    $(KBUILD_EXTMOD)/modules.order \
1346                    $(KBUILD_EXTMOD)/modules.builtin
1347 clean: $(clean-dirs)
1348         $(call cmd,rmdirs)
1349         $(call cmd,rmfiles)
1350         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1351                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1352                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1353                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1354
1355 help:
1356         @echo  '  Building external modules.'
1357         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1358         @echo  ''
1359         @echo  '  modules         - default target, build the module(s)'
1360         @echo  '  modules_install - install the module'
1361         @echo  '  clean           - remove generated files in module directory only'
1362         @echo  ''
1363
1364 # Dummies...
1365 PHONY += prepare scripts
1366 prepare: ;
1367 scripts: ;
1368 endif # KBUILD_EXTMOD
1369
1370 # Generate tags for editors
1371 # ---------------------------------------------------------------------------
1372 quiet_cmd_tags = GEN     $@
1373       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1374
1375 tags TAGS cscope: FORCE
1376         $(call cmd,tags)
1377
1378 # Scripts to check various things for consistency
1379 # ---------------------------------------------------------------------------
1380
1381 includecheck:
1382         find * $(RCS_FIND_IGNORE) \
1383                 -name '*.[hcS]' -type f -print | sort \
1384                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1385
1386 versioncheck:
1387         find * $(RCS_FIND_IGNORE) \
1388                 -name '*.[hcS]' -type f -print | sort \
1389                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1390
1391 coccicheck:
1392         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1393
1394 namespacecheck:
1395         $(PERL) $(srctree)/scripts/namespace.pl
1396
1397 export_report:
1398         $(PERL) $(srctree)/scripts/export_report.pl
1399
1400 endif #ifeq ($(config-targets),1)
1401 endif #ifeq ($(mixed-targets),1)
1402
1403 PHONY += checkstack kernelrelease kernelversion
1404
1405 # UML needs a little special treatment here.  It wants to use the host
1406 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1407 # else wants $(ARCH), including people doing cross-builds, which means
1408 # that $(SUBARCH) doesn't work here.
1409 ifeq ($(ARCH), um)
1410 CHECKSTACK_ARCH := $(SUBARCH)
1411 else
1412 CHECKSTACK_ARCH := $(ARCH)
1413 endif
1414 checkstack:
1415         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1416         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1417
1418 kernelrelease:
1419         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1420
1421 kernelversion:
1422         @echo $(KERNELVERSION)
1423
1424 # Single targets
1425 # ---------------------------------------------------------------------------
1426 # Single targets are compatible with:
1427 # - build with mixed source and output
1428 # - build with separate output dir 'make O=...'
1429 # - external modules
1430 #
1431 #  target-dir => where to store outputfile
1432 #  build-dir  => directory in kernel source tree to use
1433
1434 ifeq ($(KBUILD_EXTMOD),)
1435         build-dir  = $(patsubst %/,%,$(dir $@))
1436         target-dir = $(dir $@)
1437 else
1438         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1439         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1440         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1441 endif
1442
1443 %.s: %.c prepare scripts FORCE
1444         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1445 %.i: %.c prepare scripts FORCE
1446         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1447 %.o: %.c prepare scripts FORCE
1448         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1449 %.lst: %.c prepare scripts FORCE
1450         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1451 %.s: %.S prepare scripts FORCE
1452         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1453 %.o: %.S prepare scripts FORCE
1454         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1455 %.symtypes: %.c prepare scripts FORCE
1456         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1457
1458 # Modules
1459 /: prepare scripts FORCE
1460         $(cmd_crmodverdir)
1461         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1462         $(build)=$(build-dir)
1463 %/: prepare scripts FORCE
1464         $(cmd_crmodverdir)
1465         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1466         $(build)=$(build-dir)
1467 %.ko: prepare scripts FORCE
1468         $(cmd_crmodverdir)
1469         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1470         $(build)=$(build-dir) $(@:.ko=.o)
1471         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1472
1473 # FIXME Should go into a make.lib or something
1474 # ===========================================================================
1475
1476 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1477       cmd_rmdirs = rm -rf $(rm-dirs)
1478
1479 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1480       cmd_rmfiles = rm -f $(rm-files)
1481
1482 # Run depmod only if we have System.map and depmod is executable
1483 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1484       cmd_depmod = \
1485         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1486                 $(DEPMOD) -ae -F System.map                                     \
1487                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1488                 $(KERNELRELEASE);                                               \
1489         fi
1490
1491 # Create temporary dir for module support files
1492 # clean it up only when building all modules
1493 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1494                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1495
1496 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1497           $(KBUILD_AFLAGS_KERNEL)                              \
1498           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1499           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1500
1501 quiet_cmd_as_o_S = AS      $@
1502 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1503
1504 # read all saved command lines
1505
1506 targets := $(wildcard $(sort $(targets)))
1507 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1508
1509 ifneq ($(cmd_files),)
1510   $(cmd_files): ;       # Do not try to update included dependency files
1511   include $(cmd_files)
1512 endif
1513
1514 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1515 # Usage:
1516 # $(Q)$(MAKE) $(clean)=dir
1517 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1518
1519 endif   # skip-makefile
1520
1521 PHONY += FORCE
1522 FORCE:
1523
1524 # Declare the contents of the .PHONY variable as phony.  We keep that
1525 # information in a variable so we can use it in if_changed and friends.
1526 .PHONY: $(PHONY)