linux/Makefile
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   1VERSION = 4
   2PATCHLEVEL = 6
   3SUBLEVEL = 0
   4EXTRAVERSION =
   5NAME = Charred Weasel
   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# o Do not use make's built-in rules and variables
  14#   (this increases performance and avoids hard-to-debug behaviour);
  15# o Look for make include files relative to root of kernel src
  16MAKEFLAGS += -rR --include-dir=$(CURDIR)
  17
  18# Avoid funny character set dependencies
  19unexport LC_ALL
  20LC_COLLATE=C
  21LC_NUMERIC=C
  22export LC_COLLATE LC_NUMERIC
  23
  24# Avoid interference with shell env settings
  25unexport GREP_OPTIONS
  26
  27# We are using a recursive build, so we need to do a little thinking
  28# to get the ordering right.
  29#
  30# Most importantly: sub-Makefiles should only ever modify files in
  31# their own directory. If in some directory we have a dependency on
  32# a file in another dir (which doesn't happen often, but it's often
  33# unavoidable when linking the built-in.o targets which finally
  34# turn into vmlinux), we will call a sub make in that other dir, and
  35# after that we are sure that everything which is in that other dir
  36# is now up to date.
  37#
  38# The only cases where we need to modify files which have global
  39# effects are thus separated out and done before the recursive
  40# descending is started. They are now explicitly listed as the
  41# prepare rule.
  42
  43# Beautify output
  44# ---------------------------------------------------------------------------
  45#
  46# Normally, we echo the whole command before executing it. By making
  47# that echo $($(quiet)$(cmd)), we now have the possibility to set
  48# $(quiet) to choose other forms of output instead, e.g.
  49#
  50#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  51#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  52#
  53# If $(quiet) is empty, the whole command will be printed.
  54# If it is set to "quiet_", only the short version will be printed.
  55# If it is set to "silent_", nothing will be printed at all, since
  56# the variable $(silent_cmd_cc_o_c) doesn't exist.
  57#
  58# A simple variant is to prefix commands with $(Q) - that's useful
  59# for commands that shall be hidden in non-verbose mode.
  60#
  61#       $(Q)ln $@ :<
  62#
  63# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  64# If KBUILD_VERBOSE equals 1 then the above command is displayed.
  65#
  66# To put more focus on warnings, be less verbose as default
  67# Use 'make V=1' to see the full commands
  68
  69ifeq ("$(origin V)", "command line")
  70  KBUILD_VERBOSE = $(V)
  71endif
  72ifndef KBUILD_VERBOSE
  73  KBUILD_VERBOSE = 0
  74endif
  75
  76ifeq ($(KBUILD_VERBOSE),1)
  77  quiet =
  78  Q =
  79else
  80  quiet=quiet_
  81  Q = @
  82endif
  83
  84# If the user is running make -s (silent mode), suppress echoing of
  85# commands
  86
  87ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
  88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  89  quiet=silent_
  90endif
  91else                                    # make-3.8x
  92ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  93  quiet=silent_
  94endif
  95endif
  96
  97export quiet Q KBUILD_VERBOSE
  98
  99# kbuild supports saving output files in a separate directory.
 100# To locate output files in a separate directory two syntaxes are supported.
 101# In both cases the working directory must be the root of the kernel src.
 102# 1) O=
 103# Use "make O=dir/to/store/output/files/"
 104#
 105# 2) Set KBUILD_OUTPUT
 106# Set the environment variable KBUILD_OUTPUT to point to the directory
 107# where the output files shall be placed.
 108# export KBUILD_OUTPUT=dir/to/store/output/files/
 109# make
 110#
 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112# variable.
 113
 114# KBUILD_SRC is set on invocation of make in OBJ directory
 115# KBUILD_SRC is not intended to be used by the regular user (for now)
 116ifeq ($(KBUILD_SRC),)
 117
 118# OK, Make called in directory where kernel src resides
 119# Do we want to locate output files in a separate directory?
 120ifeq ("$(origin O)", "command line")
 121  KBUILD_OUTPUT := $(O)
 122endif
 123
 124# That's our default target when none is given on the command line
 125PHONY := _all
 126_all:
 127
 128# Cancel implicit rules on top Makefile
 129$(CURDIR)/Makefile Makefile: ;
 130
 131ifneq ($(KBUILD_OUTPUT),)
 132# Invoke a second make in the output directory, passing relevant variables
 133# check that the output directory actually exists
 134saved-output := $(KBUILD_OUTPUT)
 135KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 136                                                                && /bin/pwd)
 137$(if $(KBUILD_OUTPUT),, \
 138     $(error failed to create output directory "$(saved-output)"))
 139
 140PHONY += $(MAKECMDGOALS) sub-make
 141
 142$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 143        @:
 144
 145sub-make: FORCE
 146        $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147        -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149# Leave processing to above invocation of make
 150skip-makefile := 1
 151endif # ifneq ($(KBUILD_OUTPUT),)
 152endif # ifeq ($(KBUILD_SRC),)
 153
 154# We process the rest of the Makefile if this is the final invocation of make
 155ifeq ($(skip-makefile),)
 156
 157# Do not print "Entering directory ...",
 158# but we want to display it when entering to the output directory
 159# so that IDEs/editors are able to understand relative filenames.
 160MAKEFLAGS += --no-print-directory
 161
 162# Call a source code checker (by default, "sparse") as part of the
 163# C compilation.
 164#
 165# Use 'make C=1' to enable checking of only re-compiled files.
 166# Use 'make C=2' to enable checking of *all* source files, regardless
 167# of whether they are re-compiled or not.
 168#
 169# See the file "Documentation/sparse.txt" for more details, including
 170# where to get the "sparse" utility.
 171
 172ifeq ("$(origin C)", "command line")
 173  KBUILD_CHECKSRC = $(C)
 174endif
 175ifndef KBUILD_CHECKSRC
 176  KBUILD_CHECKSRC = 0
 177endif
 178
 179# Use make M=dir to specify directory of external module to build
 180# Old syntax make ... SUBDIRS=$PWD is still supported
 181# Setting the environment variable KBUILD_EXTMOD take precedence
 182ifdef SUBDIRS
 183  KBUILD_EXTMOD ?= $(SUBDIRS)
 184endif
 185
 186ifeq ("$(origin M)", "command line")
 187  KBUILD_EXTMOD := $(M)
 188endif
 189
 190# If building an external module we do not care about the all: rule
 191# but instead _all depend on modules
 192PHONY += all
 193ifeq ($(KBUILD_EXTMOD),)
 194_all: all
 195else
 196_all: modules
 197endif
 198
 199ifeq ($(KBUILD_SRC),)
 200        # building in the source tree
 201        srctree := .
 202else
 203        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 204                # building in a subdirectory of the source tree
 205                srctree := ..
 206        else
 207                srctree := $(KBUILD_SRC)
 208        endif
 209endif
 210objtree         := .
 211src             := $(srctree)
 212obj             := $(objtree)
 213
 214VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 215
 216export srctree objtree VPATH
 217
 218# SUBARCH tells the usermode build what the underlying arch is.  That is set
 219# first, and if a usermode build is happening, the "ARCH=um" on the command
 220# line overrides the setting of ARCH below.  If a native build is happening,
 221# then ARCH is assigned, getting whatever value it gets normally, and
 222# SUBARCH is subsequently ignored.
 223
 224SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 225                                  -e s/sun4u/sparc64/ \
 226                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 227                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 228                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 229                                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 230
 231# Cross compiling and selecting different set of gcc/bin-utils
 232# ---------------------------------------------------------------------------
 233#
 234# When performing cross compilation for other architectures ARCH shall be set
 235# to the target architecture. (See arch/* for the possibilities).
 236# ARCH can be set during invocation of make:
 237# make ARCH=ia64
 238# Another way is to have ARCH set in the environment.
 239# The default ARCH is the host where make is executed.
 240
 241# CROSS_COMPILE specify the prefix used for all executables used
 242# during compilation. Only gcc and related bin-utils executables
 243# are prefixed with $(CROSS_COMPILE).
 244# CROSS_COMPILE can be set on the command line
 245# make CROSS_COMPILE=ia64-linux-
 246# Alternatively CROSS_COMPILE can be set in the environment.
 247# A third alternative is to store a setting in .config so that plain
 248# "make" in the configured kernel build directory always uses that.
 249# Default value for CROSS_COMPILE is not to prefix executables
 250# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 251ARCH            ?= $(SUBARCH)
 252CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 253
 254# Architecture as present in compile.h
 255UTS_MACHINE     := $(ARCH)
 256SRCARCH         := $(ARCH)
 257
 258# Additional ARCH settings for x86
 259ifeq ($(ARCH),i386)
 260        SRCARCH := x86
 261endif
 262ifeq ($(ARCH),x86_64)
 263        SRCARCH := x86
 264endif
 265
 266# Additional ARCH settings for sparc
 267ifeq ($(ARCH),sparc32)
 268       SRCARCH := sparc
 269endif
 270ifeq ($(ARCH),sparc64)
 271       SRCARCH := sparc
 272endif
 273
 274# Additional ARCH settings for sh
 275ifeq ($(ARCH),sh64)
 276       SRCARCH := sh
 277endif
 278
 279# Additional ARCH settings for tile
 280ifeq ($(ARCH),tilepro)
 281       SRCARCH := tile
 282endif
 283ifeq ($(ARCH),tilegx)
 284       SRCARCH := tile
 285endif
 286
 287# Where to locate arch specific headers
 288hdr-arch  := $(SRCARCH)
 289
 290KCONFIG_CONFIG  ?= .config
 291export KCONFIG_CONFIG
 292
 293# SHELL used by kbuild
 294CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 295          else if [ -x /bin/bash ]; then echo /bin/bash; \
 296          else echo sh; fi ; fi)
 297
 298HOSTCC       = gcc
 299HOSTCXX      = g++
 300HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 301HOSTCXXFLAGS = -O2
 302
 303ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 304HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 305                -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 306endif
 307
 308# Decide whether to build built-in, modular, or both.
 309# Normally, just do built-in.
 310
 311KBUILD_MODULES :=
 312KBUILD_BUILTIN := 1
 313
 314# If we have only "make modules", don't compile built-in objects.
 315# When we're building modules with modversions, we need to consider
 316# the built-in objects during the descend as well, in order to
 317# make sure the checksums are up to date before we record them.
 318
 319ifeq ($(MAKECMDGOALS),modules)
 320  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 321endif
 322
 323# If we have "make <whatever> modules", compile modules
 324# in addition to whatever we do anyway.
 325# Just "make" or "make all" shall build modules as well
 326
 327ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 328  KBUILD_MODULES := 1
 329endif
 330
 331ifeq ($(MAKECMDGOALS),)
 332  KBUILD_MODULES := 1
 333endif
 334
 335export KBUILD_MODULES KBUILD_BUILTIN
 336export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 337
 338# We need some generic definitions (do not try to remake the file).
 339scripts/Kbuild.include: ;
 340include scripts/Kbuild.include
 341
 342# Make variables (CC, etc...)
 343AS              = $(CROSS_COMPILE)as
 344LD              = $(CROSS_COMPILE)ld
 345CC              = $(CROSS_COMPILE)gcc
 346CPP             = $(CC) -E
 347AR              = $(CROSS_COMPILE)ar
 348NM              = $(CROSS_COMPILE)nm
 349STRIP           = $(CROSS_COMPILE)strip
 350OBJCOPY         = $(CROSS_COMPILE)objcopy
 351OBJDUMP         = $(CROSS_COMPILE)objdump
 352AWK             = awk
 353GENKSYMS        = scripts/genksyms/genksyms
 354INSTALLKERNEL  := installkernel
 355DEPMOD          = /sbin/depmod
 356PERL            = perl
 357PYTHON          = python
 358CHECK           = sparse
 359
 360CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 361                  -Wbitwise -Wno-return-void $(CF)
 362CFLAGS_MODULE   =
 363AFLAGS_MODULE   =
 364LDFLAGS_MODULE  =
 365CFLAGS_KERNEL   =
 366AFLAGS_KERNEL   =
 367CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 368CFLAGS_KCOV     = -fsanitize-coverage=trace-pc
 369
 370
 371# Use USERINCLUDE when you must reference the UAPI directories only.
 372USERINCLUDE    := \
 373                -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 374                -Iarch/$(hdr-arch)/include/generated/uapi \
 375                -I$(srctree)/include/uapi \
 376                -Iinclude/generated/uapi \
 377                -include $(srctree)/include/linux/kconfig.h
 378
 379# Use LINUXINCLUDE when you must reference the include/ directory.
 380# Needed to be compatible with the O= option
 381LINUXINCLUDE    := \
 382                -I$(srctree)/arch/$(hdr-arch)/include \
 383                -Iarch/$(hdr-arch)/include/generated/uapi \
 384                -Iarch/$(hdr-arch)/include/generated \
 385                $(if $(KBUILD_SRC), -I$(srctree)/include) \
 386                -Iinclude \
 387                $(USERINCLUDE)
 388
 389KBUILD_CPPFLAGS := -D__KERNEL__
 390
 391KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 392                   -fno-strict-aliasing -fno-common \
 393                   -Werror-implicit-function-declaration \
 394                   -Wno-format-security \
 395                   -std=gnu89
 396
 397KBUILD_AFLAGS_KERNEL :=
 398KBUILD_CFLAGS_KERNEL :=
 399KBUILD_AFLAGS   := -D__ASSEMBLY__
 400KBUILD_AFLAGS_MODULE  := -DMODULE
 401KBUILD_CFLAGS_MODULE  := -DMODULE
 402KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 403
 404# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 405KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 406KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 407
 408export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 409export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 410export CPP AR NM STRIP OBJCOPY OBJDUMP
 411export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 412export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 413
 414export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 415export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
 416export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 417export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 418export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 419export KBUILD_ARFLAGS
 420
 421# When compiling out-of-tree modules, put MODVERDIR in the module
 422# tree rather than in the kernel tree. The kernel tree might
 423# even be read-only.
 424export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 425
 426# Files to ignore in find ... statements
 427
 428export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 429                          -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 430                          -prune -o
 431export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 432                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
 433
 434# ===========================================================================
 435# Rules shared between *config targets and build targets
 436
 437# Basic helpers built in scripts/
 438PHONY += scripts_basic
 439scripts_basic:
 440        $(Q)$(MAKE) $(build)=scripts/basic
 441        $(Q)rm -f .tmp_quiet_recordmcount
 442
 443# To avoid any implicit rule to kick in, define an empty command.
 444scripts/basic/%: scripts_basic ;
 445
 446PHONY += outputmakefile
 447# outputmakefile generates a Makefile in the output directory, if using a
 448# separate output directory. This allows convenient use of make in the
 449# output directory.
 450outputmakefile:
 451ifneq ($(KBUILD_SRC),)
 452        $(Q)ln -fsn $(srctree) source
 453        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 454            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 455endif
 456
 457# Support for using generic headers in asm-generic
 458PHONY += asm-generic
 459asm-generic:
 460        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 461                    src=asm obj=arch/$(SRCARCH)/include/generated/asm
 462        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 463                    src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 464
 465# To make sure we do not include .config for any of the *config targets
 466# catch them early, and hand them over to scripts/kconfig/Makefile
 467# It is allowed to specify more targets when calling make, including
 468# mixing *config targets and build targets.
 469# For example 'make oldconfig all'.
 470# Detect when mixed targets is specified, and make a second invocation
 471# of make so .config is not included in this case either (for *config).
 472
 473version_h := include/generated/uapi/linux/version.h
 474old_version_h := include/linux/version.h
 475
 476no-dot-config-targets := clean mrproper distclean \
 477                         cscope gtags TAGS tags help% %docs check% coccicheck \
 478                         $(version_h) headers_% archheaders archscripts \
 479                         kernelversion %src-pkg
 480
 481config-targets := 0
 482mixed-targets  := 0
 483dot-config     := 1
 484
 485ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 486        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 487                dot-config := 0
 488        endif
 489endif
 490
 491ifeq ($(KBUILD_EXTMOD),)
 492        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 493                config-targets := 1
 494                ifneq ($(words $(MAKECMDGOALS)),1)
 495                        mixed-targets := 1
 496                endif
 497        endif
 498endif
 499# install and module_install need also be processed one by one
 500ifneq ($(filter install,$(MAKECMDGOALS)),)
 501        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 502                mixed-targets := 1
 503        endif
 504endif
 505
 506ifeq ($(mixed-targets),1)
 507# ===========================================================================
 508# We're called with mixed targets (*config and build targets).
 509# Handle them one by one.
 510
 511PHONY += $(MAKECMDGOALS) __build_one_by_one
 512
 513$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 514        @:
 515
 516__build_one_by_one:
 517        $(Q)set -e; \
 518        for i in $(MAKECMDGOALS); do \
 519                $(MAKE) -f $(srctree)/Makefile $$i; \
 520        done
 521
 522else
 523ifeq ($(config-targets),1)
 524# ===========================================================================
 525# *config targets only - make sure prerequisites are updated, and descend
 526# in scripts/kconfig to make the *config target
 527
 528# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 529# KBUILD_DEFCONFIG may point out an alternative default configuration
 530# used for 'make defconfig'
 531include arch/$(SRCARCH)/Makefile
 532export KBUILD_DEFCONFIG KBUILD_KCONFIG
 533
 534config: scripts_basic outputmakefile FORCE
 535        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 536
 537%config: scripts_basic outputmakefile FORCE
 538        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 539
 540else
 541# ===========================================================================
 542# Build targets only - this includes vmlinux, arch specific targets, clean
 543# targets and others. In general all targets except *config targets.
 544
 545ifeq ($(KBUILD_EXTMOD),)
 546# Additional helpers built in scripts/
 547# Carefully list dependencies so we do not try to build scripts twice
 548# in parallel
 549PHONY += scripts
 550scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 551         asm-generic
 552        $(Q)$(MAKE) $(build)=$(@)
 553
 554# Objects we will link into vmlinux / subdirs we need to visit
 555init-y          := init/
 556drivers-y       := drivers/ sound/ firmware/
 557net-y           := net/
 558libs-y          := lib/
 559core-y          := usr/
 560virt-y          := virt/
 561endif # KBUILD_EXTMOD
 562
 563ifeq ($(dot-config),1)
 564# Read in config
 565-include include/config/auto.conf
 566
 567ifeq ($(KBUILD_EXTMOD),)
 568# Read in dependencies to all Kconfig* files, make sure to run
 569# oldconfig if changes are detected.
 570-include include/config/auto.conf.cmd
 571
 572# To avoid any implicit rule to kick in, define an empty command
 573$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 574
 575# If .config is newer than include/config/auto.conf, someone tinkered
 576# with it and forgot to run make oldconfig.
 577# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 578# we execute the config step to be sure to catch updated Kconfig files
 579include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 580        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 581else
 582# external modules needs include/generated/autoconf.h and include/config/auto.conf
 583# but do not care if they are up-to-date. Use auto.conf to trigger the test
 584PHONY += include/config/auto.conf
 585
 586include/config/auto.conf:
 587        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 588        echo >&2;                                                       \
 589        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 590        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 591        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 592        echo >&2 ;                                                      \
 593        /bin/false)
 594
 595endif # KBUILD_EXTMOD
 596
 597else
 598# Dummy target needed, because used as prerequisite
 599include/config/auto.conf: ;
 600endif # $(dot-config)
 601
 602# The all: target is the default when no target is given on the
 603# command line.
 604# This allow a user to issue only 'make' to build a kernel including modules
 605# Defaults to vmlinux, but the arch makefile usually adds further targets
 606all: vmlinux
 607
 608# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 609# values of the respective KBUILD_* variables
 610ARCH_CPPFLAGS :=
 611ARCH_AFLAGS :=
 612ARCH_CFLAGS :=
 613include arch/$(SRCARCH)/Makefile
 614
 615KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 616
 617ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 618KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 619else
 620KBUILD_CFLAGS   += -O2
 621endif
 622
 623# Tell gcc to never replace conditional load with a non-conditional one
 624KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 625
 626ifdef CONFIG_READABLE_ASM
 627# Disable optimizations that make assembler listings hard to read.
 628# reorder blocks reorders the control in the function
 629# ipa clone creates specialized cloned functions
 630# partial inlining inlines only parts of functions
 631KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 632                 $(call cc-option,-fno-ipa-cp-clone,) \
 633                 $(call cc-option,-fno-partial-inlining)
 634endif
 635
 636ifneq ($(CONFIG_FRAME_WARN),0)
 637KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 638endif
 639
 640# Handle stack protector mode.
 641#
 642# Since kbuild can potentially perform two passes (first with the old
 643# .config values and then with updated .config values), we cannot error out
 644# if a desired compiler option is unsupported. If we were to error, kbuild
 645# could never get to the second pass and actually notice that we changed
 646# the option to something that was supported.
 647#
 648# Additionally, we don't want to fallback and/or silently change which compiler
 649# flags will be used, since that leads to producing kernels with different
 650# security feature characteristics depending on the compiler used. ("But I
 651# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
 652#
 653# The middle ground is to warn here so that the failed option is obvious, but
 654# to let the build fail with bad compiler flags so that we can't produce a
 655# kernel when there is a CONFIG and compiler mismatch.
 656#
 657ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 658  stackp-flag := -fstack-protector
 659  ifeq ($(call cc-option, $(stackp-flag)),)
 660    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
 661             -fstack-protector not supported by compiler)
 662  endif
 663else
 664ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 665  stackp-flag := -fstack-protector-strong
 666  ifeq ($(call cc-option, $(stackp-flag)),)
 667    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 668              -fstack-protector-strong not supported by compiler)
 669  endif
 670else
 671  # Force off for distro compilers that enable stack protector by default.
 672  stackp-flag := $(call cc-option, -fno-stack-protector)
 673endif
 674endif
 675KBUILD_CFLAGS += $(stackp-flag)
 676
 677ifdef CONFIG_KCOV
 678  ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
 679    $(warning Cannot use CONFIG_KCOV: \
 680             -fsanitize-coverage=trace-pc is not supported by compiler)
 681    CFLAGS_KCOV =
 682  endif
 683endif
 684
 685ifeq ($(cc-name),clang)
 686KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 687KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 688KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 689KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 690KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 691# Quiet clang warning: comparison of unsigned expression < 0 is always false
 692KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 693# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 694# source of a reference will be _MergedGlobals and not on of the whitelisted names.
 695# See modpost pattern 2
 696KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 697KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 698else
 699
 700# This warning generated too much noise in a regular build.
 701# Use make W=1 to enable this warning (see scripts/Makefile.build)
 702KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 703endif
 704
 705ifdef CONFIG_FRAME_POINTER
 706KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 707else
 708# Some targets (ARM with Thumb2, for example), can't be built with frame
 709# pointers.  For those, we don't have FUNCTION_TRACER automatically
 710# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 711# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 712# -fomit-frame-pointer with FUNCTION_TRACER.
 713ifndef CONFIG_FUNCTION_TRACER
 714KBUILD_CFLAGS   += -fomit-frame-pointer
 715endif
 716endif
 717
 718KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 719
 720ifdef CONFIG_DEBUG_INFO
 721ifdef CONFIG_DEBUG_INFO_SPLIT
 722KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 723else
 724KBUILD_CFLAGS   += -g
 725endif
 726KBUILD_AFLAGS   += -Wa,-gdwarf-2
 727endif
 728ifdef CONFIG_DEBUG_INFO_DWARF4
 729KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 730endif
 731
 732ifdef CONFIG_DEBUG_INFO_REDUCED
 733KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 734                   $(call cc-option,-fno-var-tracking)
 735endif
 736
 737ifdef CONFIG_FUNCTION_TRACER
 738ifndef CC_FLAGS_FTRACE
 739CC_FLAGS_FTRACE := -pg
 740endif
 741export CC_FLAGS_FTRACE
 742ifdef CONFIG_HAVE_FENTRY
 743CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 744endif
 745KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 746KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 747ifdef CONFIG_DYNAMIC_FTRACE
 748        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 749                BUILD_C_RECORDMCOUNT := y
 750                export BUILD_C_RECORDMCOUNT
 751        endif
 752endif
 753endif
 754
 755# We trigger additional mismatches with less inlining
 756ifdef CONFIG_DEBUG_SECTION_MISMATCH
 757KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 758endif
 759
 760# arch Makefile may override CC so keep this after arch Makefile is included
 761NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 762CHECKFLAGS     += $(NOSTDINC_FLAGS)
 763
 764# warn about C99 declaration after statement
 765KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 766
 767# disable pointer signed / unsigned warnings in gcc 4.0
 768KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 769
 770# disable invalid "can't wrap" optimizations for signed / pointers
 771KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 772
 773# conserve stack if available
 774KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 775
 776# disallow errors like 'EXPORT_GPL(foo);' with missing header
 777KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 778
 779# require functions to have arguments in prototypes, not empty 'int foo()'
 780KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 781
 782# Prohibit date/time macros, which would make the build non-deterministic
 783KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 784
 785# use the deterministic mode of AR if available
 786KBUILD_ARFLAGS := $(call ar-option,D)
 787
 788# check for 'asm goto'
 789ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 790        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 791        KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 792endif
 793
 794include scripts/Makefile.kasan
 795include scripts/Makefile.extrawarn
 796include scripts/Makefile.ubsan
 797
 798# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 799# last assignments
 800KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 801KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 802KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 803
 804# Use --build-id when available.
 805LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 806                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 807KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 808LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 809
 810ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 811LDFLAGS_vmlinux += $(call ld-option, -X,)
 812endif
 813
 814# Default kernel image to build when no specific target is given.
 815# KBUILD_IMAGE may be overruled on the command line or
 816# set in the environment
 817# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 818# this default value
 819export KBUILD_IMAGE ?= vmlinux
 820
 821#
 822# INSTALL_PATH specifies where to place the updated kernel and system map
 823# images. Default is /boot, but you can set it to other values
 824export  INSTALL_PATH ?= /boot
 825
 826#
 827# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 828# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 829# an argument if needed. Otherwise it defaults to the kernel install path
 830#
 831export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 832
 833#
 834# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 835# relocations required by build roots.  This is not defined in the
 836# makefile but the argument can be passed to make if needed.
 837#
 838
 839MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 840export MODLIB
 841
 842#
 843# INSTALL_MOD_STRIP, if defined, will cause modules to be
 844# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 845# the default option --strip-debug will be used.  Otherwise,
 846# INSTALL_MOD_STRIP value will be used as the options to the strip command.
 847
 848ifdef INSTALL_MOD_STRIP
 849ifeq ($(INSTALL_MOD_STRIP),1)
 850mod_strip_cmd = $(STRIP) --strip-debug
 851else
 852mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 853endif # INSTALL_MOD_STRIP=1
 854else
 855mod_strip_cmd = true
 856endif # INSTALL_MOD_STRIP
 857export mod_strip_cmd
 858
 859# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 860# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 861# or CONFIG_MODULE_COMPRESS_XZ.
 862
 863mod_compress_cmd = true
 864ifdef CONFIG_MODULE_COMPRESS
 865  ifdef CONFIG_MODULE_COMPRESS_GZIP
 866    mod_compress_cmd = gzip -n -f
 867  endif # CONFIG_MODULE_COMPRESS_GZIP
 868  ifdef CONFIG_MODULE_COMPRESS_XZ
 869    mod_compress_cmd = xz -f
 870  endif # CONFIG_MODULE_COMPRESS_XZ
 871endif # CONFIG_MODULE_COMPRESS
 872export mod_compress_cmd
 873
 874# Select initial ramdisk compression format, default is gzip(1).
 875# This shall be used by the dracut(8) tool while creating an initramfs image.
 876#
 877INITRD_COMPRESS-y                  := gzip
 878INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 879INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 880INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 881INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 882INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 883# do not export INITRD_COMPRESS, since we didn't actually
 884# choose a sane default compression above.
 885# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 886
 887ifdef CONFIG_MODULE_SIG_ALL
 888$(eval $(call config_filename,MODULE_SIG_KEY))
 889
 890mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 891else
 892mod_sign_cmd = true
 893endif
 894export mod_sign_cmd
 895
 896
 897ifeq ($(KBUILD_EXTMOD),)
 898core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 899
 900vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 901                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 902                     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 903
 904vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 905                     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 906
 907init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 908core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 909drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 910net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 911libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 912libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 913libs-y          := $(libs-y1) $(libs-y2)
 914virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 915
 916# Externally visible symbols (used by link-vmlinux.sh)
 917export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 918export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 919export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 920export LDFLAGS_vmlinux
 921# used by scripts/pacmage/Makefile
 922export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 923
 924vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 925
 926# Final link of vmlinux
 927      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 928quiet_cmd_link-vmlinux = LINK    $@
 929
 930# Include targets which we want to
 931# execute if the rest of the kernel build went well.
 932vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 933ifdef CONFIG_HEADERS_CHECK
 934        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 935endif
 936ifdef CONFIG_SAMPLES
 937        $(Q)$(MAKE) $(build)=samples
 938endif
 939ifdef CONFIG_BUILD_DOCSRC
 940        $(Q)$(MAKE) $(build)=Documentation
 941endif
 942ifdef CONFIG_GDB_SCRIPTS
 943        $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 944endif
 945        +$(call if_changed,link-vmlinux)
 946
 947# The actual objects are generated when descending,
 948# make sure no implicit rule kicks in
 949$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 950
 951# Handle descending into subdirectories listed in $(vmlinux-dirs)
 952# Preset locale variables to speed up the build process. Limit locale
 953# tweaks to this spot to avoid wrong language settings when running
 954# make menuconfig etc.
 955# Error messages still appears in the original language
 956
 957PHONY += $(vmlinux-dirs)
 958$(vmlinux-dirs): prepare scripts
 959        $(Q)$(MAKE) $(build)=$@
 960
 961define filechk_kernel.release
 962        echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 963endef
 964
 965# Store (new) KERNELRELEASE string in include/config/kernel.release
 966include/config/kernel.release: include/config/auto.conf FORCE
 967        $(call filechk,kernel.release)
 968
 969
 970# Things we need to do before we recursively start building the kernel
 971# or the modules are listed in "prepare".
 972# A multi level approach is used. prepareN is processed before prepareN-1.
 973# archprepare is used in arch Makefiles and when processed asm symlink,
 974# version.h and scripts_basic is processed / created.
 975
 976# Listed in dependency order
 977PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 978
 979# prepare3 is used to check if we are building in a separate output directory,
 980# and if so do:
 981# 1) Check that make has not been executed in the kernel src $(srctree)
 982prepare3: include/config/kernel.release
 983ifneq ($(KBUILD_SRC),)
 984        @$(kecho) '  Using $(srctree) as source for kernel'
 985        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 986                echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 987                echo >&2 "  in the '$(srctree)' directory.";\
 988                /bin/false; \
 989        fi;
 990endif
 991
 992# prepare2 creates a makefile if using a separate output directory
 993prepare2: prepare3 outputmakefile asm-generic
 994
 995prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 996                   include/config/auto.conf
 997        $(cmd_crmodverdir)
 998
 999archprepare: archheaders archscripts prepare1 scripts_basic
1000
1001prepare0: archprepare FORCE
1002        $(Q)$(MAKE) $(build)=.
1003
1004# All the preparing..
1005prepare: prepare0 prepare-objtool
1006
1007ifdef CONFIG_STACK_VALIDATION
1008  has_libelf := $(call try-run,\
1009                echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1010  ifeq ($(has_libelf),1)
1011    objtool_target := tools/objtool FORCE
1012  else
1013    $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev or elfutils-libelf-devel")
1014    SKIP_STACK_VALIDATION := 1
1015    export SKIP_STACK_VALIDATION
1016  endif
1017endif
1018
1019PHONY += prepare-objtool
1020prepare-objtool: $(objtool_target)
1021
1022# Generate some files
1023# ---------------------------------------------------------------------------
1024
1025# KERNELRELEASE can change from a few different places, meaning version.h
1026# needs to be updated, so this check is forced on all builds
1027
1028uts_len := 64
1029define filechk_utsrelease.h
1030        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1031          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1032          exit 1;                                                         \
1033        fi;                                                               \
1034        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1035endef
1036
1037define filechk_version.h
1038        (echo \#define LINUX_VERSION_CODE $(shell                         \
1039        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1040        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1041endef
1042
1043$(version_h): $(srctree)/Makefile FORCE
1044        $(call filechk,version.h)
1045        $(Q)rm -f $(old_version_h)
1046
1047include/generated/utsrelease.h: include/config/kernel.release FORCE
1048        $(call filechk,utsrelease.h)
1049
1050PHONY += headerdep
1051headerdep:
1052        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1053        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1054
1055# ---------------------------------------------------------------------------
1056# Firmware install
1057INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1058export INSTALL_FW_PATH
1059
1060PHONY += firmware_install
1061firmware_install: FORCE
1062        @mkdir -p $(objtree)/firmware
1063        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1064
1065# ---------------------------------------------------------------------------
1066# Kernel headers
1067
1068#Default location for installed headers
1069export INSTALL_HDR_PATH = $(objtree)/usr
1070
1071# If we do an all arch process set dst to asm-$(hdr-arch)
1072hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1073
1074PHONY += archheaders
1075archheaders:
1076
1077PHONY += archscripts
1078archscripts:
1079
1080PHONY += __headers
1081__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1082        $(Q)$(MAKE) $(build)=scripts build_unifdef
1083
1084PHONY += headers_install_all
1085headers_install_all:
1086        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1087
1088PHONY += headers_install
1089headers_install: __headers
1090        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1091          $(error Headers not exportable for the $(SRCARCH) architecture))
1092        $(Q)$(MAKE) $(hdr-inst)=include/uapi
1093        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1094
1095PHONY += headers_check_all
1096headers_check_all: headers_install_all
1097        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1098
1099PHONY += headers_check
1100headers_check: headers_install
1101        $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1102        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1103
1104# ---------------------------------------------------------------------------
1105# Kernel selftest
1106
1107PHONY += kselftest
1108kselftest:
1109        $(Q)$(MAKE) -C tools/testing/selftests run_tests
1110
1111kselftest-clean:
1112        $(Q)$(MAKE) -C tools/testing/selftests clean
1113
1114PHONY += kselftest-merge
1115kselftest-merge:
1116        $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1117        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1118                -m $(objtree)/.config \
1119                $(srctree)/tools/testing/selftests/*/config
1120        +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1121
1122# ---------------------------------------------------------------------------
1123# Modules
1124
1125ifdef CONFIG_MODULES
1126
1127# By default, build modules as well
1128
1129all: modules
1130
1131# Build modules
1132#
1133# A module can be listed more than once in obj-m resulting in
1134# duplicate lines in modules.order files.  Those are removed
1135# using awk while concatenating to the final file.
1136
1137PHONY += modules
1138modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1139        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1140        @$(kecho) '  Building modules, stage 2.';
1141        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1142        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1143
1144modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1145        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1146
1147%/modules.builtin: include/config/auto.conf
1148        $(Q)$(MAKE) $(modbuiltin)=$*
1149
1150
1151# Target to prepare building external modules
1152PHONY += modules_prepare
1153modules_prepare: prepare scripts
1154
1155# Target to install modules
1156PHONY += modules_install
1157modules_install: _modinst_ _modinst_post
1158
1159PHONY += _modinst_
1160_modinst_:
1161        @rm -rf $(MODLIB)/kernel
1162        @rm -f $(MODLIB)/source
1163        @mkdir -p $(MODLIB)/kernel
1164        @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1165        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1166                rm -f $(MODLIB)/build ; \
1167                ln -s $(CURDIR) $(MODLIB)/build ; \
1168        fi
1169        @cp -f $(objtree)/modules.order $(MODLIB)/
1170        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1171        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1172
1173# This depmod is only for convenience to give the initial
1174# boot a modules.dep even before / is mounted read-write.  However the
1175# boot script depmod is the master version.
1176PHONY += _modinst_post
1177_modinst_post: _modinst_
1178        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1179        $(call cmd,depmod)
1180
1181ifeq ($(CONFIG_MODULE_SIG), y)
1182PHONY += modules_sign
1183modules_sign:
1184        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1185endif
1186
1187else # CONFIG_MODULES
1188
1189# Modules not configured
1190# ---------------------------------------------------------------------------
1191
1192modules modules_install: FORCE
1193        @echo >&2
1194        @echo >&2 "The present kernel configuration has modules disabled."
1195        @echo >&2 "Type 'make config' and enable loadable module support."
1196        @echo >&2 "Then build a kernel with module support enabled."
1197        @echo >&2
1198        @exit 1
1199
1200endif # CONFIG_MODULES
1201
1202###
1203# Cleaning is done on three levels.
1204# make clean     Delete most generated files
1205#                Leave enough to build external modules
1206# make mrproper  Delete the current configuration, and all generated files
1207# make distclean Remove editor backup files, patch leftover files and the like
1208
1209# Directories & files removed with 'make clean'
1210CLEAN_DIRS  += $(MODVERDIR)
1211
1212# Directories & files removed with 'make mrproper'
1213MRPROPER_DIRS  += include/config usr/include include/generated          \
1214                  arch/*/include/generated .tmp_objdiff
1215MRPROPER_FILES += .config .config.old .version .old_version \
1216                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1217                  signing_key.pem signing_key.priv signing_key.x509     \
1218                  x509.genkey extra_certificates signing_key.x509.keyid \
1219                  signing_key.x509.signer vmlinux-gdb.py
1220
1221# clean - Delete most, but leave enough to build external modules
1222#
1223clean: rm-dirs  := $(CLEAN_DIRS)
1224clean: rm-files := $(CLEAN_FILES)
1225clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1226
1227PHONY += $(clean-dirs) clean archclean vmlinuxclean
1228$(clean-dirs):
1229        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1230
1231vmlinuxclean:
1232        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1233
1234clean: archclean vmlinuxclean
1235
1236# mrproper - Delete all generated files, including .config
1237#
1238mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1239mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1240mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1241
1242PHONY += $(mrproper-dirs) mrproper archmrproper
1243$(mrproper-dirs):
1244        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1245
1246mrproper: clean archmrproper $(mrproper-dirs)
1247        $(call cmd,rmdirs)
1248        $(call cmd,rmfiles)
1249
1250# distclean
1251#
1252PHONY += distclean
1253
1254distclean: mrproper
1255        @find $(srctree) $(RCS_FIND_IGNORE) \
1256                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1257                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1258                -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1259                -type f -print | xargs rm -f
1260
1261
1262# Packaging of the kernel to various formats
1263# ---------------------------------------------------------------------------
1264# rpm target kept for backward compatibility
1265package-dir     := scripts/package
1266
1267%src-pkg: FORCE
1268        $(Q)$(MAKE) $(build)=$(package-dir) $@
1269%pkg: include/config/kernel.release FORCE
1270        $(Q)$(MAKE) $(build)=$(package-dir) $@
1271rpm: include/config/kernel.release FORCE
1272        $(Q)$(MAKE) $(build)=$(package-dir) $@
1273
1274
1275# Brief documentation of the typical targets used
1276# ---------------------------------------------------------------------------
1277
1278boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1279boards := $(sort $(notdir $(boards)))
1280board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1281board-dirs := $(sort $(notdir $(board-dirs:/=)))
1282
1283help:
1284        @echo  'Cleaning targets:'
1285        @echo  '  clean           - Remove most generated files but keep the config and'
1286        @echo  '                    enough build support to build external modules'
1287        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1288        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1289        @echo  ''
1290        @echo  'Configuration targets:'
1291        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1292        @echo  ''
1293        @echo  'Other generic targets:'
1294        @echo  '  all             - Build all targets marked with [*]'
1295        @echo  '* vmlinux         - Build the bare kernel'
1296        @echo  '* modules         - Build all modules'
1297        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1298        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1299        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1300        @echo  '  dir/            - Build all files in dir and below'
1301        @echo  '  dir/file.[ois]  - Build specified target only'
1302        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1303        @echo  '                    (requires a recent binutils and recent build (System.map))'
1304        @echo  '  dir/file.ko     - Build module including final link'
1305        @echo  '  modules_prepare - Set up for building external modules'
1306        @echo  '  tags/TAGS       - Generate tags file for editors'
1307        @echo  '  cscope          - Generate cscope index'
1308        @echo  '  gtags           - Generate GNU GLOBAL index'
1309        @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1310        @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1311        @echo  '  image_name      - Output the image name (use with make -s)'
1312        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1313         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1314         echo  ''
1315        @echo  'Static analysers'
1316        @echo  '  checkstack      - Generate a list of stack hogs'
1317        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1318        @echo  '  versioncheck    - Sanity check on version.h usage'
1319        @echo  '  includecheck    - Check for duplicate included header files'
1320        @echo  '  export_report   - List the usages of all exported symbols'
1321        @echo  '  headers_check   - Sanity check on exported headers'
1322        @echo  '  headerdep       - Detect inclusion cycles in headers'
1323        @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1324        @echo  ''
1325        @echo  'Kernel selftest'
1326        @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1327        @echo  '                    Build, install, and boot kernel before'
1328        @echo  '                    running kselftest on it'
1329        @echo  '  kselftest-clean - Remove all generated kselftest files'
1330        @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1331        @echo  '                    .config.'
1332        @echo  ''
1333        @echo  'Kernel packaging:'
1334        @$(MAKE) $(build)=$(package-dir) help
1335        @echo  ''
1336        @echo  'Documentation targets:'
1337        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1338        @echo  ''
1339        @echo  'Architecture specific targets ($(SRCARCH)):'
1340        @$(if $(archhelp),$(archhelp),\
1341                echo '  No architecture specific help defined for $(SRCARCH)')
1342        @echo  ''
1343        @$(if $(boards), \
1344                $(foreach b, $(boards), \
1345                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1346                echo '')
1347        @$(if $(board-dirs), \
1348                $(foreach b, $(board-dirs), \
1349                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1350                printf "  %-16s - Show all of the above\\n" help-boards; \
1351                echo '')
1352
1353        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1354        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1355        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1356        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1357        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1358        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1359        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1360        @echo  '                1: warnings which may be relevant and do not occur too often'
1361        @echo  '                2: warnings which occur quite often but may still be relevant'
1362        @echo  '                3: more obscure warnings, can most likely be ignored'
1363        @echo  '                Multiple levels can be combined with W=12 or W=123'
1364        @echo  ''
1365        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1366        @echo  'For further info see the ./README file'
1367
1368
1369help-board-dirs := $(addprefix help-,$(board-dirs))
1370
1371help-boards: $(help-board-dirs)
1372
1373boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1374
1375$(help-board-dirs): help-%:
1376        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1377        @$(if $(boards-per-dir), \
1378                $(foreach b, $(boards-per-dir), \
1379                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1380                echo '')
1381
1382
1383# Documentation targets
1384# ---------------------------------------------------------------------------
1385%docs: scripts_basic FORCE
1386        $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1387        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1388
1389else # KBUILD_EXTMOD
1390
1391###
1392# External module support.
1393# When building external modules the kernel used as basis is considered
1394# read-only, and no consistency checks are made and the make
1395# system is not used on the basis kernel. If updates are required
1396# in the basis kernel ordinary make commands (without M=...) must
1397# be used.
1398#
1399# The following are the only valid targets when building external
1400# modules.
1401# make M=dir clean     Delete all automatically generated files
1402# make M=dir modules   Make all modules in specified dir
1403# make M=dir           Same as 'make M=dir modules'
1404# make M=dir modules_install
1405#                      Install the modules built in the module directory
1406#                      Assumes install directory is already created
1407
1408# We are always building modules
1409KBUILD_MODULES := 1
1410PHONY += crmodverdir
1411crmodverdir:
1412        $(cmd_crmodverdir)
1413
1414PHONY += $(objtree)/Module.symvers
1415$(objtree)/Module.symvers:
1416        @test -e $(objtree)/Module.symvers || ( \
1417        echo; \
1418        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1419        echo "           is missing; modules will have no dependencies and modversions."; \
1420        echo )
1421
1422module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1423PHONY += $(module-dirs) modules
1424$(module-dirs): crmodverdir $(objtree)/Module.symvers
1425        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1426
1427modules: $(module-dirs)
1428        @$(kecho) '  Building modules, stage 2.';
1429        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1430
1431PHONY += modules_install
1432modules_install: _emodinst_ _emodinst_post
1433
1434install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1435PHONY += _emodinst_
1436_emodinst_:
1437        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1438        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1439
1440PHONY += _emodinst_post
1441_emodinst_post: _emodinst_
1442        $(call cmd,depmod)
1443
1444clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1445
1446PHONY += $(clean-dirs) clean
1447$(clean-dirs):
1448        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1449
1450clean:  rm-dirs := $(MODVERDIR)
1451clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1452
1453help:
1454        @echo  '  Building external modules.'
1455        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1456        @echo  ''
1457        @echo  '  modules         - default target, build the module(s)'
1458        @echo  '  modules_install - install the module'
1459        @echo  '  clean           - remove generated files in module directory only'
1460        @echo  ''
1461
1462# Dummies...
1463PHONY += prepare scripts
1464prepare: ;
1465scripts: ;
1466endif # KBUILD_EXTMOD
1467
1468clean: $(clean-dirs)
1469        $(call cmd,rmdirs)
1470        $(call cmd,rmfiles)
1471        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1472                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1473                -o -name '*.ko.*' \
1474                -o -name '*.dwo'  \
1475                -o -name '*.su'  \
1476                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1477                -o -name '*.symtypes' -o -name 'modules.order' \
1478                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1479                -o -name '*.gcno' \) -type f -print | xargs rm -f
1480
1481# Generate tags for editors
1482# ---------------------------------------------------------------------------
1483quiet_cmd_tags = GEN     $@
1484      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1485
1486tags TAGS cscope gtags: FORCE
1487        $(call cmd,tags)
1488
1489# Scripts to check various things for consistency
1490# ---------------------------------------------------------------------------
1491
1492PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1493
1494includecheck:
1495        find $(srctree)/* $(RCS_FIND_IGNORE) \
1496                -name '*.[hcS]' -type f -print | sort \
1497                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1498
1499versioncheck:
1500        find $(srctree)/* $(RCS_FIND_IGNORE) \
1501                -name '*.[hcS]' -type f -print | sort \
1502                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1503
1504coccicheck:
1505        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1506
1507namespacecheck:
1508        $(PERL) $(srctree)/scripts/namespace.pl
1509
1510export_report:
1511        $(PERL) $(srctree)/scripts/export_report.pl
1512
1513endif #ifeq ($(config-targets),1)
1514endif #ifeq ($(mixed-targets),1)
1515
1516PHONY += checkstack kernelrelease kernelversion image_name
1517
1518# UML needs a little special treatment here.  It wants to use the host
1519# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1520# else wants $(ARCH), including people doing cross-builds, which means
1521# that $(SUBARCH) doesn't work here.
1522ifeq ($(ARCH), um)
1523CHECKSTACK_ARCH := $(SUBARCH)
1524else
1525CHECKSTACK_ARCH := $(ARCH)
1526endif
1527checkstack:
1528        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1529        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1530
1531kernelrelease:
1532        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1533
1534kernelversion:
1535        @echo $(KERNELVERSION)
1536
1537image_name:
1538        @echo $(KBUILD_IMAGE)
1539
1540# Clear a bunch of variables before executing the submake
1541tools/: FORCE
1542        $(Q)mkdir -p $(objtree)/tools
1543        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1544
1545tools/%: FORCE
1546        $(Q)mkdir -p $(objtree)/tools
1547        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1548
1549# Single targets
1550# ---------------------------------------------------------------------------
1551# Single targets are compatible with:
1552# - build with mixed source and output
1553# - build with separate output dir 'make O=...'
1554# - external modules
1555#
1556#  target-dir => where to store outputfile
1557#  build-dir  => directory in kernel source tree to use
1558
1559ifeq ($(KBUILD_EXTMOD),)
1560        build-dir  = $(patsubst %/,%,$(dir $@))
1561        target-dir = $(dir $@)
1562else
1563        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1564        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1565        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1566endif
1567
1568%.s: %.c prepare scripts FORCE
1569        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1570%.i: %.c prepare scripts FORCE
1571        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1572%.o: %.c prepare scripts FORCE
1573        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1574%.lst: %.c prepare scripts FORCE
1575        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1576%.s: %.S prepare scripts FORCE
1577        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1578%.o: %.S prepare scripts FORCE
1579        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1580%.symtypes: %.c prepare scripts FORCE
1581        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1582
1583# Modules
1584/: prepare scripts FORCE
1585        $(cmd_crmodverdir)
1586        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1587        $(build)=$(build-dir)
1588# Make sure the latest headers are built for Documentation
1589Documentation/: headers_install
1590%/: prepare scripts FORCE
1591        $(cmd_crmodverdir)
1592        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1593        $(build)=$(build-dir)
1594%.ko: prepare scripts FORCE
1595        $(cmd_crmodverdir)
1596        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1597        $(build)=$(build-dir) $(@:.ko=.o)
1598        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1599
1600# FIXME Should go into a make.lib or something
1601# ===========================================================================
1602
1603quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1604      cmd_rmdirs = rm -rf $(rm-dirs)
1605
1606quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1607      cmd_rmfiles = rm -f $(rm-files)
1608
1609# Run depmod only if we have System.map and depmod is executable
1610quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1611      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1612                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1613
1614# Create temporary dir for module support files
1615# clean it up only when building all modules
1616cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1617                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1618
1619# read all saved command lines
1620
1621targets := $(wildcard $(sort $(targets)))
1622cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1623
1624ifneq ($(cmd_files),)
1625  $(cmd_files): ;       # Do not try to update included dependency files
1626  include $(cmd_files)
1627endif
1628
1629endif   # skip-makefile
1630
1631PHONY += FORCE
1632FORCE:
1633
1634# Declare the contents of the .PHONY variable as phony.  We keep that
1635# information in a variable so we can use it in if_changed and friends.
1636.PHONY: $(PHONY)
1637