The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/Makefile

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    1 VERSION = 3
    2 PATCHLEVEL = 8
    3 SUBLEVEL = 0
    4 EXTRAVERSION = -rc6
    5 NAME = Unicycling Gorilla
    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 := $(O)
  103 endif
  104 
  105 ifeq ("$(origin W)", "command line")
  106   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
  107 endif
  108 
  109 # That's our default target when none is given on the command line
  110 PHONY := _all
  111 _all:
  112 
  113 # Cancel implicit rules on top Makefile
  114 $(CURDIR)/Makefile Makefile: ;
  115 
  116 ifneq ($(KBUILD_OUTPUT),)
  117 # Invoke a second make in the output directory, passing relevant variables
  118 # check that the output directory actually exists
  119 saved-output := $(KBUILD_OUTPUT)
  120 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
  121 $(if $(KBUILD_OUTPUT),, \
  122      $(error output directory "$(saved-output)" does not exist))
  123 
  124 PHONY += $(MAKECMDGOALS) sub-make
  125 
  126 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
  127         @:
  128 
  129 sub-make: FORCE
  130         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
  131         KBUILD_SRC=$(CURDIR) \
  132         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
  133         $(filter-out _all sub-make,$(MAKECMDGOALS))
  134 
  135 # Leave processing to above invocation of make
  136 skip-makefile := 1
  137 endif # ifneq ($(KBUILD_OUTPUT),)
  138 endif # ifeq ($(KBUILD_SRC),)
  139 
  140 # We process the rest of the Makefile if this is the final invocation of make
  141 ifeq ($(skip-makefile),)
  142 
  143 # If building an external module we do not care about the all: rule
  144 # but instead _all depend on modules
  145 PHONY += all
  146 ifeq ($(KBUILD_EXTMOD),)
  147 _all: all
  148 else
  149 _all: modules
  150 endif
  151 
  152 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
  153 objtree         := $(CURDIR)
  154 src             := $(srctree)
  155 obj             := $(objtree)
  156 
  157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
  158 
  159 export srctree objtree VPATH
  160 
  161 
  162 # SUBARCH tells the usermode build what the underlying arch is.  That is set
  163 # first, and if a usermode build is happening, the "ARCH=um" on the command
  164 # line overrides the setting of ARCH below.  If a native build is happening,
  165 # then ARCH is assigned, getting whatever value it gets normally, and 
  166 # SUBARCH is subsequently ignored.
  167 
  168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
  169                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
  170                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
  171                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
  172                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
  173 
  174 # Cross compiling and selecting different set of gcc/bin-utils
  175 # ---------------------------------------------------------------------------
  176 #
  177 # When performing cross compilation for other architectures ARCH shall be set
  178 # to the target architecture. (See arch/* for the possibilities).
  179 # ARCH can be set during invocation of make:
  180 # make ARCH=ia64
  181 # Another way is to have ARCH set in the environment.
  182 # The default ARCH is the host where make is executed.
  183 
  184 # CROSS_COMPILE specify the prefix used for all executables used
  185 # during compilation. Only gcc and related bin-utils executables
  186 # are prefixed with $(CROSS_COMPILE).
  187 # CROSS_COMPILE can be set on the command line
  188 # make CROSS_COMPILE=ia64-linux-
  189 # Alternatively CROSS_COMPILE can be set in the environment.
  190 # A third alternative is to store a setting in .config so that plain
  191 # "make" in the configured kernel build directory always uses that.
  192 # Default value for CROSS_COMPILE is not to prefix executables
  193 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
  194 export KBUILD_BUILDHOST := $(SUBARCH)
  195 ARCH            ?= $(SUBARCH)
  196 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
  197 
  198 # Architecture as present in compile.h
  199 UTS_MACHINE     := $(ARCH)
  200 SRCARCH         := $(ARCH)
  201 
  202 # Additional ARCH settings for x86
  203 ifeq ($(ARCH),i386)
  204         SRCARCH := x86
  205 endif
  206 ifeq ($(ARCH),x86_64)
  207         SRCARCH := x86
  208 endif
  209 
  210 # Additional ARCH settings for sparc
  211 ifeq ($(ARCH),sparc32)
  212        SRCARCH := sparc
  213 endif
  214 ifeq ($(ARCH),sparc64)
  215        SRCARCH := sparc
  216 endif
  217 
  218 # Additional ARCH settings for sh
  219 ifeq ($(ARCH),sh64)
  220        SRCARCH := sh
  221 endif
  222 
  223 # Additional ARCH settings for tile
  224 ifeq ($(ARCH),tilepro)
  225        SRCARCH := tile
  226 endif
  227 ifeq ($(ARCH),tilegx)
  228        SRCARCH := tile
  229 endif
  230 
  231 # Where to locate arch specific headers
  232 hdr-arch  := $(SRCARCH)
  233 
  234 KCONFIG_CONFIG  ?= .config
  235 export KCONFIG_CONFIG
  236 
  237 # SHELL used by kbuild
  238 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
  239           else if [ -x /bin/bash ]; then echo /bin/bash; \
  240           else echo sh; fi ; fi)
  241 
  242 HOSTCC       = gcc
  243 HOSTCXX      = g++
  244 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
  245 HOSTCXXFLAGS = -O2
  246 
  247 # Decide whether to build built-in, modular, or both.
  248 # Normally, just do built-in.
  249 
  250 KBUILD_MODULES :=
  251 KBUILD_BUILTIN := 1
  252 
  253 #       If we have only "make modules", don't compile built-in objects.
  254 #       When we're building modules with modversions, we need to consider
  255 #       the built-in objects during the descend as well, in order to
  256 #       make sure the checksums are up to date before we record them.
  257 
  258 ifeq ($(MAKECMDGOALS),modules)
  259   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
  260 endif
  261 
  262 #       If we have "make <whatever> modules", compile modules
  263 #       in addition to whatever we do anyway.
  264 #       Just "make" or "make all" shall build modules as well
  265 
  266 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
  267   KBUILD_MODULES := 1
  268 endif
  269 
  270 ifeq ($(MAKECMDGOALS),)
  271   KBUILD_MODULES := 1
  272 endif
  273 
  274 export KBUILD_MODULES KBUILD_BUILTIN
  275 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
  276 
  277 # Beautify output
  278 # ---------------------------------------------------------------------------
  279 #
  280 # Normally, we echo the whole command before executing it. By making
  281 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  282 # $(quiet) to choose other forms of output instead, e.g.
  283 #
  284 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  285 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  286 #
  287 # If $(quiet) is empty, the whole command will be printed.
  288 # If it is set to "quiet_", only the short version will be printed. 
  289 # If it is set to "silent_", nothing will be printed at all, since
  290 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  291 #
  292 # A simple variant is to prefix commands with $(Q) - that's useful
  293 # for commands that shall be hidden in non-verbose mode.
  294 #
  295 #       $(Q)ln $@ :<
  296 #
  297 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  298 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  299 
  300 ifeq ($(KBUILD_VERBOSE),1)
  301   quiet =
  302   Q =
  303 else
  304   quiet=quiet_
  305   Q = @
  306 endif
  307 
  308 # If the user is running make -s (silent mode), suppress echoing of
  309 # commands
  310 
  311 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  312   quiet=silent_
  313 endif
  314 
  315 export quiet Q KBUILD_VERBOSE
  316 
  317 
  318 # Look for make include files relative to root of kernel src
  319 MAKEFLAGS += --include-dir=$(srctree)
  320 
  321 # We need some generic definitions (do not try to remake the file).
  322 $(srctree)/scripts/Kbuild.include: ;
  323 include $(srctree)/scripts/Kbuild.include
  324 
  325 # Make variables (CC, etc...)
  326 
  327 AS              = $(CROSS_COMPILE)as
  328 LD              = $(CROSS_COMPILE)ld
  329 CC              = $(CROSS_COMPILE)gcc
  330 CPP             = $(CC) -E
  331 AR              = $(CROSS_COMPILE)ar
  332 NM              = $(CROSS_COMPILE)nm
  333 STRIP           = $(CROSS_COMPILE)strip
  334 OBJCOPY         = $(CROSS_COMPILE)objcopy
  335 OBJDUMP         = $(CROSS_COMPILE)objdump
  336 AWK             = awk
  337 GENKSYMS        = scripts/genksyms/genksyms
  338 INSTALLKERNEL  := installkernel
  339 DEPMOD          = /sbin/depmod
  340 PERL            = perl
  341 CHECK           = sparse
  342 
  343 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
  344                   -Wbitwise -Wno-return-void $(CF)
  345 CFLAGS_MODULE   =
  346 AFLAGS_MODULE   =
  347 LDFLAGS_MODULE  =
  348 CFLAGS_KERNEL   =
  349 AFLAGS_KERNEL   =
  350 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
  351 
  352 
  353 # Use USERINCLUDE when you must reference the UAPI directories only.
  354 USERINCLUDE    := \
  355                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
  356                 -Iarch/$(hdr-arch)/include/generated/uapi \
  357                 -I$(srctree)/include/uapi \
  358                 -Iinclude/generated/uapi \
  359                 -include $(srctree)/include/linux/kconfig.h
  360 
  361 # Use LINUXINCLUDE when you must reference the include/ directory.
  362 # Needed to be compatible with the O= option
  363 LINUXINCLUDE    := \
  364                 -I$(srctree)/arch/$(hdr-arch)/include \
  365                 -Iarch/$(hdr-arch)/include/generated \
  366                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
  367                 -Iinclude \
  368                 $(USERINCLUDE)
  369 
  370 KBUILD_CPPFLAGS := -D__KERNEL__
  371 
  372 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
  373                    -fno-strict-aliasing -fno-common \
  374                    -Werror-implicit-function-declaration \
  375                    -Wno-format-security \
  376                    -fno-delete-null-pointer-checks
  377 KBUILD_AFLAGS_KERNEL :=
  378 KBUILD_CFLAGS_KERNEL :=
  379 KBUILD_AFLAGS   := -D__ASSEMBLY__
  380 KBUILD_AFLAGS_MODULE  := -DMODULE
  381 KBUILD_CFLAGS_MODULE  := -DMODULE
  382 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
  383 
  384 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
  385 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
  386 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
  387 
  388 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
  389 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
  390 export CPP AR NM STRIP OBJCOPY OBJDUMP
  391 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
  392 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
  393 
  394 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
  395 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
  396 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
  397 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
  398 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
  399 export KBUILD_ARFLAGS
  400 
  401 # When compiling out-of-tree modules, put MODVERDIR in the module
  402 # tree rather than in the kernel tree. The kernel tree might
  403 # even be read-only.
  404 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
  405 
  406 # Files to ignore in find ... statements
  407 
  408 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
  409                    -o -name .pc -o -name .hg -o -name .git \) -prune -o
  410 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
  411                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
  412 
  413 # ===========================================================================
  414 # Rules shared between *config targets and build targets
  415 
  416 # Basic helpers built in scripts/
  417 PHONY += scripts_basic
  418 scripts_basic:
  419         $(Q)$(MAKE) $(build)=scripts/basic
  420         $(Q)rm -f .tmp_quiet_recordmcount
  421 
  422 # To avoid any implicit rule to kick in, define an empty command.
  423 scripts/basic/%: scripts_basic ;
  424 
  425 PHONY += outputmakefile
  426 # outputmakefile generates a Makefile in the output directory, if using a
  427 # separate output directory. This allows convenient use of make in the
  428 # output directory.
  429 outputmakefile:
  430 ifneq ($(KBUILD_SRC),)
  431         $(Q)ln -fsn $(srctree) source
  432         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
  433             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
  434 endif
  435 
  436 # Support for using generic headers in asm-generic
  437 PHONY += asm-generic
  438 asm-generic:
  439         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
  440                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
  441         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
  442                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
  443 
  444 # To make sure we do not include .config for any of the *config targets
  445 # catch them early, and hand them over to scripts/kconfig/Makefile
  446 # It is allowed to specify more targets when calling make, including
  447 # mixing *config targets and build targets.
  448 # For example 'make oldconfig all'.
  449 # Detect when mixed targets is specified, and make a second invocation
  450 # of make so .config is not included in this case either (for *config).
  451 
  452 version_h := include/generated/uapi/linux/version.h
  453 
  454 no-dot-config-targets := clean mrproper distclean \
  455                          cscope gtags TAGS tags help %docs check% coccicheck \
  456                          $(version_h) headers_% archheaders archscripts \
  457                          kernelversion %src-pkg
  458 
  459 config-targets := 0
  460 mixed-targets  := 0
  461 dot-config     := 1
  462 
  463 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
  464         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
  465                 dot-config := 0
  466         endif
  467 endif
  468 
  469 ifeq ($(KBUILD_EXTMOD),)
  470         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
  471                 config-targets := 1
  472                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
  473                         mixed-targets := 1
  474                 endif
  475         endif
  476 endif
  477 
  478 ifeq ($(mixed-targets),1)
  479 # ===========================================================================
  480 # We're called with mixed targets (*config and build targets).
  481 # Handle them one by one.
  482 
  483 %:: FORCE
  484         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
  485 
  486 else
  487 ifeq ($(config-targets),1)
  488 # ===========================================================================
  489 # *config targets only - make sure prerequisites are updated, and descend
  490 # in scripts/kconfig to make the *config target
  491 
  492 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
  493 # KBUILD_DEFCONFIG may point out an alternative default configuration
  494 # used for 'make defconfig'
  495 include $(srctree)/arch/$(SRCARCH)/Makefile
  496 export KBUILD_DEFCONFIG KBUILD_KCONFIG
  497 
  498 config: scripts_basic outputmakefile FORCE
  499         $(Q)mkdir -p include/linux include/config
  500         $(Q)$(MAKE) $(build)=scripts/kconfig $@
  501 
  502 %config: scripts_basic outputmakefile FORCE
  503         $(Q)mkdir -p include/linux include/config
  504         $(Q)$(MAKE) $(build)=scripts/kconfig $@
  505 
  506 else
  507 # ===========================================================================
  508 # Build targets only - this includes vmlinux, arch specific targets, clean
  509 # targets and others. In general all targets except *config targets.
  510 
  511 ifeq ($(KBUILD_EXTMOD),)
  512 # Additional helpers built in scripts/
  513 # Carefully list dependencies so we do not try to build scripts twice
  514 # in parallel
  515 PHONY += scripts
  516 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
  517         $(Q)$(MAKE) $(build)=$(@)
  518 
  519 # Objects we will link into vmlinux / subdirs we need to visit
  520 init-y          := init/
  521 drivers-y       := drivers/ sound/ firmware/
  522 net-y           := net/
  523 libs-y          := lib/
  524 core-y          := usr/
  525 endif # KBUILD_EXTMOD
  526 
  527 ifeq ($(dot-config),1)
  528 # Read in config
  529 -include include/config/auto.conf
  530 
  531 ifeq ($(KBUILD_EXTMOD),)
  532 # Read in dependencies to all Kconfig* files, make sure to run
  533 # oldconfig if changes are detected.
  534 -include include/config/auto.conf.cmd
  535 
  536 # To avoid any implicit rule to kick in, define an empty command
  537 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
  538 
  539 # If .config is newer than include/config/auto.conf, someone tinkered
  540 # with it and forgot to run make oldconfig.
  541 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
  542 # we execute the config step to be sure to catch updated Kconfig files
  543 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
  544         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
  545 else
  546 # external modules needs include/generated/autoconf.h and include/config/auto.conf
  547 # but do not care if they are up-to-date. Use auto.conf to trigger the test
  548 PHONY += include/config/auto.conf
  549 
  550 include/config/auto.conf:
  551         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
  552         echo >&2;                                                       \
  553         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
  554         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
  555         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
  556         echo >&2 ;                                                      \
  557         /bin/false)
  558 
  559 endif # KBUILD_EXTMOD
  560 
  561 else
  562 # Dummy target needed, because used as prerequisite
  563 include/config/auto.conf: ;
  564 endif # $(dot-config)
  565 
  566 # The all: target is the default when no target is given on the
  567 # command line.
  568 # This allow a user to issue only 'make' to build a kernel including modules
  569 # Defaults to vmlinux, but the arch makefile usually adds further targets
  570 all: vmlinux
  571 
  572 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
  573 KBUILD_CFLAGS   += -Os
  574 else
  575 KBUILD_CFLAGS   += -O2
  576 endif
  577 
  578 include $(srctree)/arch/$(SRCARCH)/Makefile
  579 
  580 ifdef CONFIG_READABLE_ASM
  581 # Disable optimizations that make assembler listings hard to read.
  582 # reorder blocks reorders the control in the function
  583 # ipa clone creates specialized cloned functions
  584 # partial inlining inlines only parts of functions
  585 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
  586                  $(call cc-option,-fno-ipa-cp-clone,) \
  587                  $(call cc-option,-fno-partial-inlining)
  588 endif
  589 
  590 ifneq ($(CONFIG_FRAME_WARN),0)
  591 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
  592 endif
  593 
  594 # Force gcc to behave correct even for buggy distributions
  595 ifndef CONFIG_CC_STACKPROTECTOR
  596 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
  597 endif
  598 
  599 # This warning generated too much noise in a regular build.
  600 # Use make W=1 to enable this warning (see scripts/Makefile.build)
  601 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
  602 
  603 ifdef CONFIG_FRAME_POINTER
  604 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
  605 else
  606 # Some targets (ARM with Thumb2, for example), can't be built with frame
  607 # pointers.  For those, we don't have FUNCTION_TRACER automatically
  608 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
  609 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
  610 # -fomit-frame-pointer with FUNCTION_TRACER.
  611 ifndef CONFIG_FUNCTION_TRACER
  612 KBUILD_CFLAGS   += -fomit-frame-pointer
  613 endif
  614 endif
  615 
  616 ifdef CONFIG_DEBUG_INFO
  617 KBUILD_CFLAGS   += -g
  618 KBUILD_AFLAGS   += -gdwarf-2
  619 endif
  620 
  621 ifdef CONFIG_DEBUG_INFO_REDUCED
  622 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
  623 endif
  624 
  625 ifdef CONFIG_FUNCTION_TRACER
  626 ifdef CONFIG_HAVE_FENTRY
  627 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
  628 endif
  629 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
  630 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
  631 ifdef CONFIG_DYNAMIC_FTRACE
  632         ifdef CONFIG_HAVE_C_RECORDMCOUNT
  633                 BUILD_C_RECORDMCOUNT := y
  634                 export BUILD_C_RECORDMCOUNT
  635         endif
  636 endif
  637 endif
  638 
  639 # We trigger additional mismatches with less inlining
  640 ifdef CONFIG_DEBUG_SECTION_MISMATCH
  641 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
  642 endif
  643 
  644 # arch Makefile may override CC so keep this after arch Makefile is included
  645 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
  646 CHECKFLAGS     += $(NOSTDINC_FLAGS)
  647 
  648 # warn about C99 declaration after statement
  649 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
  650 
  651 # disable pointer signed / unsigned warnings in gcc 4.0
  652 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
  653 
  654 # disable invalid "can't wrap" optimizations for signed / pointers
  655 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
  656 
  657 # conserve stack if available
  658 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
  659 
  660 # use the deterministic mode of AR if available
  661 KBUILD_ARFLAGS := $(call ar-option,D)
  662 
  663 # check for 'asm goto'
  664 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
  665         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
  666 endif
  667 
  668 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
  669 KBUILD_CPPFLAGS += $(KCPPFLAGS)
  670 KBUILD_AFLAGS += $(KAFLAGS)
  671 KBUILD_CFLAGS += $(KCFLAGS)
  672 
  673 # Use --build-id when available.
  674 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
  675                               $(call cc-ldoption, -Wl$(comma)--build-id,))
  676 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
  677 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
  678 
  679 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
  680 LDFLAGS_vmlinux += $(call ld-option, -X,)
  681 endif
  682 
  683 # Default kernel image to build when no specific target is given.
  684 # KBUILD_IMAGE may be overruled on the command line or
  685 # set in the environment
  686 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
  687 # this default value
  688 export KBUILD_IMAGE ?= vmlinux
  689 
  690 #
  691 # INSTALL_PATH specifies where to place the updated kernel and system map
  692 # images. Default is /boot, but you can set it to other values
  693 export  INSTALL_PATH ?= /boot
  694 
  695 #
  696 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
  697 # relocations required by build roots.  This is not defined in the
  698 # makefile but the argument can be passed to make if needed.
  699 #
  700 
  701 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
  702 export MODLIB
  703 
  704 #
  705 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
  706 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
  707 #  the default option --strip-debug will be used.  Otherwise,
  708 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
  709 
  710 ifdef INSTALL_MOD_STRIP
  711 ifeq ($(INSTALL_MOD_STRIP),1)
  712 mod_strip_cmd = $(STRIP) --strip-debug
  713 else
  714 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
  715 endif # INSTALL_MOD_STRIP=1
  716 else
  717 mod_strip_cmd = true
  718 endif # INSTALL_MOD_STRIP
  719 export mod_strip_cmd
  720 
  721 
  722 ifeq ($(CONFIG_MODULE_SIG),y)
  723 MODSECKEY = ./signing_key.priv
  724 MODPUBKEY = ./signing_key.x509
  725 export MODPUBKEY
  726 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(MODSECKEY) $(MODPUBKEY)
  727 else
  728 mod_sign_cmd = true
  729 endif
  730 export mod_sign_cmd
  731 
  732 
  733 ifeq ($(KBUILD_EXTMOD),)
  734 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
  735 
  736 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
  737                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
  738                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
  739 
  740 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
  741                      $(init-n) $(init-) \
  742                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
  743                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
  744 
  745 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
  746 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
  747 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
  748 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
  749 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
  750 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
  751 libs-y          := $(libs-y1) $(libs-y2)
  752 
  753 # Externally visible symbols (used by link-vmlinux.sh)
  754 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
  755 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
  756 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
  757 export LDFLAGS_vmlinux
  758 
  759 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
  760 
  761 # Final link of vmlinux
  762       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
  763 quiet_cmd_link-vmlinux = LINK    $@
  764 
  765 # Include targets which we want to
  766 # execute if the rest of the kernel build went well.
  767 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
  768 ifdef CONFIG_HEADERS_CHECK
  769         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
  770 endif
  771 ifdef CONFIG_SAMPLES
  772         $(Q)$(MAKE) $(build)=samples
  773 endif
  774 ifdef CONFIG_BUILD_DOCSRC
  775         $(Q)$(MAKE) $(build)=Documentation
  776 endif
  777         +$(call if_changed,link-vmlinux)
  778 
  779 # The actual objects are generated when descending, 
  780 # make sure no implicit rule kicks in
  781 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
  782 
  783 # Handle descending into subdirectories listed in $(vmlinux-dirs)
  784 # Preset locale variables to speed up the build process. Limit locale
  785 # tweaks to this spot to avoid wrong language settings when running
  786 # make menuconfig etc.
  787 # Error messages still appears in the original language
  788 
  789 PHONY += $(vmlinux-dirs)
  790 $(vmlinux-dirs): prepare scripts
  791         $(Q)$(MAKE) $(build)=$@
  792 
  793 # Store (new) KERNELRELASE string in include/config/kernel.release
  794 include/config/kernel.release: include/config/auto.conf FORCE
  795         $(Q)rm -f $@
  796         $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
  797 
  798 
  799 # Things we need to do before we recursively start building the kernel
  800 # or the modules are listed in "prepare".
  801 # A multi level approach is used. prepareN is processed before prepareN-1.
  802 # archprepare is used in arch Makefiles and when processed asm symlink,
  803 # version.h and scripts_basic is processed / created.
  804 
  805 # Listed in dependency order
  806 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
  807 
  808 # prepare3 is used to check if we are building in a separate output directory,
  809 # and if so do:
  810 # 1) Check that make has not been executed in the kernel src $(srctree)
  811 prepare3: include/config/kernel.release
  812 ifneq ($(KBUILD_SRC),)
  813         @$(kecho) '  Using $(srctree) as source for kernel'
  814         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
  815                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
  816                 echo >&2 "  in the '$(srctree)' directory.";\
  817                 /bin/false; \
  818         fi;
  819 endif
  820 
  821 # prepare2 creates a makefile if using a separate output directory
  822 prepare2: prepare3 outputmakefile asm-generic
  823 
  824 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
  825                    include/config/auto.conf
  826         $(cmd_crmodverdir)
  827 
  828 archprepare: archheaders archscripts prepare1 scripts_basic
  829 
  830 prepare0: archprepare FORCE
  831         $(Q)$(MAKE) $(build)=.
  832 
  833 # All the preparing..
  834 prepare: prepare0
  835 
  836 # Generate some files
  837 # ---------------------------------------------------------------------------
  838 
  839 # KERNELRELEASE can change from a few different places, meaning version.h
  840 # needs to be updated, so this check is forced on all builds
  841 
  842 uts_len := 64
  843 define filechk_utsrelease.h
  844         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
  845           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
  846           exit 1;                                                         \
  847         fi;                                                               \
  848         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
  849 endef
  850 
  851 define filechk_version.h
  852         (echo \#define LINUX_VERSION_CODE $(shell                         \
  853         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
  854         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
  855 endef
  856 
  857 $(version_h): $(srctree)/Makefile FORCE
  858         $(call filechk,version.h)
  859 
  860 include/generated/utsrelease.h: include/config/kernel.release FORCE
  861         $(call filechk,utsrelease.h)
  862 
  863 PHONY += headerdep
  864 headerdep:
  865         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
  866         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
  867 
  868 # ---------------------------------------------------------------------------
  869 
  870 PHONY += depend dep
  871 depend dep:
  872         @echo '*** Warning: make $@ is unnecessary now.'
  873 
  874 # ---------------------------------------------------------------------------
  875 # Firmware install
  876 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
  877 export INSTALL_FW_PATH
  878 
  879 PHONY += firmware_install
  880 firmware_install: FORCE
  881         @mkdir -p $(objtree)/firmware
  882         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
  883 
  884 # ---------------------------------------------------------------------------
  885 # Kernel headers
  886 
  887 #Default location for installed headers
  888 export INSTALL_HDR_PATH = $(objtree)/usr
  889 
  890 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
  891 
  892 # If we do an all arch process set dst to asm-$(hdr-arch)
  893 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
  894 
  895 PHONY += archheaders
  896 archheaders:
  897 
  898 PHONY += archscripts
  899 archscripts:
  900 
  901 PHONY += __headers
  902 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
  903         $(Q)$(MAKE) $(build)=scripts build_unifdef
  904 
  905 PHONY += headers_install_all
  906 headers_install_all:
  907         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
  908 
  909 PHONY += headers_install
  910 headers_install: __headers
  911         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
  912           $(error Headers not exportable for the $(SRCARCH) architecture))
  913         $(Q)$(MAKE) $(hdr-inst)=include/uapi
  914         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
  915 
  916 PHONY += headers_check_all
  917 headers_check_all: headers_install_all
  918         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
  919 
  920 PHONY += headers_check
  921 headers_check: headers_install
  922         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
  923         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
  924 
  925 # ---------------------------------------------------------------------------
  926 # Modules
  927 
  928 ifdef CONFIG_MODULES
  929 
  930 # By default, build modules as well
  931 
  932 all: modules
  933 
  934 #       Build modules
  935 #
  936 #       A module can be listed more than once in obj-m resulting in
  937 #       duplicate lines in modules.order files.  Those are removed
  938 #       using awk while concatenating to the final file.
  939 
  940 PHONY += modules
  941 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
  942         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
  943         @$(kecho) '  Building modules, stage 2.';
  944         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
  945         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
  946 
  947 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
  948         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
  949 
  950 %/modules.builtin: include/config/auto.conf
  951         $(Q)$(MAKE) $(modbuiltin)=$*
  952 
  953 
  954 # Target to prepare building external modules
  955 PHONY += modules_prepare
  956 modules_prepare: prepare scripts
  957 
  958 # Target to install modules
  959 PHONY += modules_install
  960 modules_install: _modinst_ _modinst_post
  961 
  962 PHONY += _modinst_
  963 _modinst_:
  964         @rm -rf $(MODLIB)/kernel
  965         @rm -f $(MODLIB)/source
  966         @mkdir -p $(MODLIB)/kernel
  967         @ln -s $(srctree) $(MODLIB)/source
  968         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
  969                 rm -f $(MODLIB)/build ; \
  970                 ln -s $(objtree) $(MODLIB)/build ; \
  971         fi
  972         @cp -f $(objtree)/modules.order $(MODLIB)/
  973         @cp -f $(objtree)/modules.builtin $(MODLIB)/
  974         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
  975 
  976 # This depmod is only for convenience to give the initial
  977 # boot a modules.dep even before / is mounted read-write.  However the
  978 # boot script depmod is the master version.
  979 PHONY += _modinst_post
  980 _modinst_post: _modinst_
  981         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
  982         $(call cmd,depmod)
  983 
  984 ifeq ($(CONFIG_MODULE_SIG), y)
  985 PHONY += modules_sign
  986 modules_sign:
  987         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
  988 endif
  989 
  990 else # CONFIG_MODULES
  991 
  992 # Modules not configured
  993 # ---------------------------------------------------------------------------
  994 
  995 modules modules_install: FORCE
  996         @echo >&2
  997         @echo >&2 "The present kernel configuration has modules disabled."
  998         @echo >&2 "Type 'make config' and enable loadable module support."
  999         @echo >&2 "Then build a kernel with module support enabled."
 1000         @echo >&2
 1001         @exit 1
 1002 
 1003 endif # CONFIG_MODULES
 1004 
 1005 ###
 1006 # Cleaning is done on three levels.
 1007 # make clean     Delete most generated files
 1008 #                Leave enough to build external modules
 1009 # make mrproper  Delete the current configuration, and all generated files
 1010 # make distclean Remove editor backup files, patch leftover files and the like
 1011 
 1012 # Directories & files removed with 'make clean'
 1013 CLEAN_DIRS  += $(MODVERDIR)
 1014 
 1015 # Directories & files removed with 'make mrproper'
 1016 MRPROPER_DIRS  += include/config usr/include include/generated          \
 1017                   arch/*/include/generated
 1018 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
 1019                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
 1020                   signing_key.priv signing_key.x509 x509.genkey         \
 1021                   extra_certificates signing_key.x509.keyid             \
 1022                   signing_key.x509.signer
 1023 
 1024 # clean - Delete most, but leave enough to build external modules
 1025 #
 1026 clean: rm-dirs  := $(CLEAN_DIRS)
 1027 clean: rm-files := $(CLEAN_FILES)
 1028 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
 1029 
 1030 PHONY += $(clean-dirs) clean archclean vmlinuxclean
 1031 $(clean-dirs):
 1032         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 1033 
 1034 vmlinuxclean:
 1035         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
 1036 
 1037 clean: archclean vmlinuxclean
 1038 
 1039 # mrproper - Delete all generated files, including .config
 1040 #
 1041 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 1042 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 1043 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
 1044 
 1045 PHONY += $(mrproper-dirs) mrproper archmrproper
 1046 $(mrproper-dirs):
 1047         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 1048 
 1049 mrproper: clean archmrproper $(mrproper-dirs)
 1050         $(call cmd,rmdirs)
 1051         $(call cmd,rmfiles)
 1052 
 1053 # distclean
 1054 #
 1055 PHONY += distclean
 1056 
 1057 distclean: mrproper
 1058         @find $(srctree) $(RCS_FIND_IGNORE) \
 1059                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 1060                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 1061                 -o -name '.*.rej' \
 1062                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
 1063                 -type f -print | xargs rm -f
 1064 
 1065 
 1066 # Packaging of the kernel to various formats
 1067 # ---------------------------------------------------------------------------
 1068 # rpm target kept for backward compatibility
 1069 package-dir     := $(srctree)/scripts/package
 1070 
 1071 %src-pkg: FORCE
 1072         $(Q)$(MAKE) $(build)=$(package-dir) $@
 1073 %pkg: include/config/kernel.release FORCE
 1074         $(Q)$(MAKE) $(build)=$(package-dir) $@
 1075 rpm: include/config/kernel.release FORCE
 1076         $(Q)$(MAKE) $(build)=$(package-dir) $@
 1077 
 1078 
 1079 # Brief documentation of the typical targets used
 1080 # ---------------------------------------------------------------------------
 1081 
 1082 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
 1083 boards := $(notdir $(boards))
 1084 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
 1085 board-dirs := $(sort $(notdir $(board-dirs:/=)))
 1086 
 1087 help:
 1088         @echo  'Cleaning targets:'
 1089         @echo  '  clean           - Remove most generated files but keep the config and'
 1090         @echo  '                    enough build support to build external modules'
 1091         @echo  '  mrproper        - Remove all generated files + config + various backup files'
 1092         @echo  '  distclean       - mrproper + remove editor backup and patch files'
 1093         @echo  ''
 1094         @echo  'Configuration targets:'
 1095         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
 1096         @echo  ''
 1097         @echo  'Other generic targets:'
 1098         @echo  '  all             - Build all targets marked with [*]'
 1099         @echo  '* vmlinux         - Build the bare kernel'
 1100         @echo  '* modules         - Build all modules'
 1101         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
 1102         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
 1103         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
 1104         @echo  '  dir/            - Build all files in dir and below'
 1105         @echo  '  dir/file.[oisS] - Build specified target only'
 1106         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
 1107         @echo  '                    (requires a recent binutils and recent build (System.map))'
 1108         @echo  '  dir/file.ko     - Build module including final link'
 1109         @echo  '  modules_prepare - Set up for building external modules'
 1110         @echo  '  tags/TAGS       - Generate tags file for editors'
 1111         @echo  '  cscope          - Generate cscope index'
 1112         @echo  '  gtags           - Generate GNU GLOBAL index'
 1113         @echo  '  kernelrelease   - Output the release version string'
 1114         @echo  '  kernelversion   - Output the version stored in Makefile'
 1115         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
 1116          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
 1117          echo  ''
 1118         @echo  'Static analysers'
 1119         @echo  '  checkstack      - Generate a list of stack hogs'
 1120         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
 1121         @echo  '  versioncheck    - Sanity check on version.h usage'
 1122         @echo  '  includecheck    - Check for duplicate included header files'
 1123         @echo  '  export_report   - List the usages of all exported symbols'
 1124         @echo  '  headers_check   - Sanity check on exported headers'
 1125         @echo  '  headerdep       - Detect inclusion cycles in headers'
 1126         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
 1127         @echo  ''
 1128         @echo  'Kernel packaging:'
 1129         @$(MAKE) $(build)=$(package-dir) help
 1130         @echo  ''
 1131         @echo  'Documentation targets:'
 1132         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
 1133         @echo  ''
 1134         @echo  'Architecture specific targets ($(SRCARCH)):'
 1135         @$(if $(archhelp),$(archhelp),\
 1136                 echo '  No architecture specific help defined for $(SRCARCH)')
 1137         @echo  ''
 1138         @$(if $(boards), \
 1139                 $(foreach b, $(boards), \
 1140                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
 1141                 echo '')
 1142         @$(if $(board-dirs), \
 1143                 $(foreach b, $(board-dirs), \
 1144                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
 1145                 printf "  %-16s - Show all of the above\\n" help-boards; \
 1146                 echo '')
 1147 
 1148         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
 1149         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
 1150         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
 1151         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
 1152         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
 1153         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
 1154         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
 1155         @echo  '                1: warnings which may be relevant and do not occur too often'
 1156         @echo  '                2: warnings which occur quite often but may still be relevant'
 1157         @echo  '                3: more obscure warnings, can most likely be ignored'
 1158         @echo  '                Multiple levels can be combined with W=12 or W=123'
 1159         @echo  ''
 1160         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
 1161         @echo  'For further info see the ./README file'
 1162 
 1163 
 1164 help-board-dirs := $(addprefix help-,$(board-dirs))
 1165 
 1166 help-boards: $(help-board-dirs)
 1167 
 1168 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
 1169 
 1170 $(help-board-dirs): help-%:
 1171         @echo  'Architecture specific targets ($(SRCARCH) $*):'
 1172         @$(if $(boards-per-dir), \
 1173                 $(foreach b, $(boards-per-dir), \
 1174                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
 1175                 echo '')
 1176 
 1177 
 1178 # Documentation targets
 1179 # ---------------------------------------------------------------------------
 1180 %docs: scripts_basic FORCE
 1181         $(Q)$(MAKE) $(build)=scripts build_docproc
 1182         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
 1183 
 1184 else # KBUILD_EXTMOD
 1185 
 1186 ###
 1187 # External module support.
 1188 # When building external modules the kernel used as basis is considered
 1189 # read-only, and no consistency checks are made and the make
 1190 # system is not used on the basis kernel. If updates are required
 1191 # in the basis kernel ordinary make commands (without M=...) must
 1192 # be used.
 1193 #
 1194 # The following are the only valid targets when building external
 1195 # modules.
 1196 # make M=dir clean     Delete all automatically generated files
 1197 # make M=dir modules   Make all modules in specified dir
 1198 # make M=dir           Same as 'make M=dir modules'
 1199 # make M=dir modules_install
 1200 #                      Install the modules built in the module directory
 1201 #                      Assumes install directory is already created
 1202 
 1203 # We are always building modules
 1204 KBUILD_MODULES := 1
 1205 PHONY += crmodverdir
 1206 crmodverdir:
 1207         $(cmd_crmodverdir)
 1208 
 1209 PHONY += $(objtree)/Module.symvers
 1210 $(objtree)/Module.symvers:
 1211         @test -e $(objtree)/Module.symvers || ( \
 1212         echo; \
 1213         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
 1214         echo "           is missing; modules will have no dependencies and modversions."; \
 1215         echo )
 1216 
 1217 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
 1218 PHONY += $(module-dirs) modules
 1219 $(module-dirs): crmodverdir $(objtree)/Module.symvers
 1220         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
 1221 
 1222 modules: $(module-dirs)
 1223         @$(kecho) '  Building modules, stage 2.';
 1224         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 1225 
 1226 PHONY += modules_install
 1227 modules_install: _emodinst_ _emodinst_post
 1228 
 1229 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
 1230 PHONY += _emodinst_
 1231 _emodinst_:
 1232         $(Q)mkdir -p $(MODLIB)/$(install-dir)
 1233         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
 1234 
 1235 PHONY += _emodinst_post
 1236 _emodinst_post: _emodinst_
 1237         $(call cmd,depmod)
 1238 
 1239 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
 1240 
 1241 PHONY += $(clean-dirs) clean
 1242 $(clean-dirs):
 1243         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 1244 
 1245 clean:  rm-dirs := $(MODVERDIR)
 1246 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
 1247 
 1248 help:
 1249         @echo  '  Building external modules.'
 1250         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
 1251         @echo  ''
 1252         @echo  '  modules         - default target, build the module(s)'
 1253         @echo  '  modules_install - install the module'
 1254         @echo  '  clean           - remove generated files in module directory only'
 1255         @echo  ''
 1256 
 1257 # Dummies...
 1258 PHONY += prepare scripts
 1259 prepare: ;
 1260 scripts: ;
 1261 endif # KBUILD_EXTMOD
 1262 
 1263 clean: $(clean-dirs)
 1264         $(call cmd,rmdirs)
 1265         $(call cmd,rmfiles)
 1266         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
 1267                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 1268                 -o -name '*.ko.*' \
 1269                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
 1270                 -o -name '*.symtypes' -o -name 'modules.order' \
 1271                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
 1272                 -o -name '*.gcno' \) -type f -print | xargs rm -f
 1273 
 1274 # Generate tags for editors
 1275 # ---------------------------------------------------------------------------
 1276 quiet_cmd_tags = GEN     $@
 1277       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
 1278 
 1279 tags TAGS cscope gtags: FORCE
 1280         $(call cmd,tags)
 1281 
 1282 # Scripts to check various things for consistency
 1283 # ---------------------------------------------------------------------------
 1284 
 1285 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
 1286 
 1287 includecheck:
 1288         find $(srctree)/* $(RCS_FIND_IGNORE) \
 1289                 -name '*.[hcS]' -type f -print | sort \
 1290                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
 1291 
 1292 versioncheck:
 1293         find $(srctree)/* $(RCS_FIND_IGNORE) \
 1294                 -name '*.[hcS]' -type f -print | sort \
 1295                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
 1296 
 1297 coccicheck:
 1298         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
 1299 
 1300 namespacecheck:
 1301         $(PERL) $(srctree)/scripts/namespace.pl
 1302 
 1303 export_report:
 1304         $(PERL) $(srctree)/scripts/export_report.pl
 1305 
 1306 endif #ifeq ($(config-targets),1)
 1307 endif #ifeq ($(mixed-targets),1)
 1308 
 1309 PHONY += checkstack kernelrelease kernelversion
 1310 
 1311 # UML needs a little special treatment here.  It wants to use the host
 1312 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
 1313 # else wants $(ARCH), including people doing cross-builds, which means
 1314 # that $(SUBARCH) doesn't work here.
 1315 ifeq ($(ARCH), um)
 1316 CHECKSTACK_ARCH := $(SUBARCH)
 1317 else
 1318 CHECKSTACK_ARCH := $(ARCH)
 1319 endif
 1320 checkstack:
 1321         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
 1322         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
 1323 
 1324 kernelrelease:
 1325         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 1326 
 1327 kernelversion:
 1328         @echo $(KERNELVERSION)
 1329 
 1330 # Clear a bunch of variables before executing the submake
 1331 tools/: FORCE
 1332         $(Q)mkdir -p $(objtree)/tools
 1333         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= O=$(objtree) subdir=tools -C $(src)/tools/
 1334 
 1335 tools/%: FORCE
 1336         $(Q)mkdir -p $(objtree)/tools
 1337         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= O=$(objtree) subdir=tools -C $(src)/tools/ $*
 1338 
 1339 # Single targets
 1340 # ---------------------------------------------------------------------------
 1341 # Single targets are compatible with:
 1342 # - build with mixed source and output
 1343 # - build with separate output dir 'make O=...'
 1344 # - external modules
 1345 #
 1346 #  target-dir => where to store outputfile
 1347 #  build-dir  => directory in kernel source tree to use
 1348 
 1349 ifeq ($(KBUILD_EXTMOD),)
 1350         build-dir  = $(patsubst %/,%,$(dir $@))
 1351         target-dir = $(dir $@)
 1352 else
 1353         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
 1354         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
 1355         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
 1356 endif
 1357 
 1358 %.s: %.c prepare scripts FORCE
 1359         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
 1360 %.i: %.c prepare scripts FORCE
 1361         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
 1362 %.o: %.c prepare scripts FORCE
 1363         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
 1364 %.lst: %.c prepare scripts FORCE
 1365         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
 1366 %.s: %.S prepare scripts FORCE
 1367         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
 1368 %.o: %.S prepare scripts FORCE
 1369         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
 1370 %.symtypes: %.c prepare scripts FORCE
 1371         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
 1372 
 1373 # Modules
 1374 /: prepare scripts FORCE
 1375         $(cmd_crmodverdir)
 1376         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
 1377         $(build)=$(build-dir)
 1378 %/: prepare scripts FORCE
 1379         $(cmd_crmodverdir)
 1380         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
 1381         $(build)=$(build-dir)
 1382 %.ko: prepare scripts FORCE
 1383         $(cmd_crmodverdir)
 1384         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
 1385         $(build)=$(build-dir) $(@:.ko=.o)
 1386         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 1387 
 1388 # FIXME Should go into a make.lib or something 
 1389 # ===========================================================================
 1390 
 1391 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
 1392       cmd_rmdirs = rm -rf $(rm-dirs)
 1393 
 1394 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
 1395       cmd_rmfiles = rm -f $(rm-files)
 1396 
 1397 # Run depmod only if we have System.map and depmod is executable
 1398 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
 1399       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
 1400                    $(KERNELRELEASE)
 1401 
 1402 # Create temporary dir for module support files
 1403 # clean it up only when building all modules
 1404 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
 1405                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
 1406 
 1407 # read all saved command lines
 1408 
 1409 targets := $(wildcard $(sort $(targets)))
 1410 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 1411 
 1412 ifneq ($(cmd_files),)
 1413   $(cmd_files): ;       # Do not try to update included dependency files
 1414   include $(cmd_files)
 1415 endif
 1416 
 1417 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
 1418 # Usage:
 1419 # $(Q)$(MAKE) $(clean)=dir
 1420 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
 1421 
 1422 endif   # skip-makefile
 1423 
 1424 PHONY += FORCE
 1425 FORCE:
 1426 
 1427 # Declare the contents of the .PHONY variable as phony.  We keep that
 1428 # information in a variable so we can use it in if_changed and friends.
 1429 .PHONY: $(PHONY)

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