linux/Makefile
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   1VERSION = 3
   2PATCHLEVEL = 18
   3SUBLEVEL = 11
   4EXTRAVERSION =
   5NAME = Diseased Newt
   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 use make's built-in rules and variables
  14# (this increases performance and avoids hard-to-debug behaviour);
  15MAKEFLAGS += -rR
  16
  17# Avoid funny character set dependencies
  18unexport LC_ALL
  19LC_COLLATE=C
  20LC_NUMERIC=C
  21export LC_COLLATE LC_NUMERIC
  22
  23# Avoid interference with shell env settings
  24unexport GREP_OPTIONS
  25
  26# We are using a recursive build, so we need to do a little thinking
  27# to get the ordering right.
  28#
  29# Most importantly: sub-Makefiles should only ever modify files in
  30# their own directory. If in some directory we have a dependency on
  31# a file in another dir (which doesn't happen often, but it's often
  32# unavoidable when linking the built-in.o targets which finally
  33# turn into vmlinux), we will call a sub make in that other dir, and
  34# after that we are sure that everything which is in that other dir
  35# is now up to date.
  36#
  37# The only cases where we need to modify files which have global
  38# effects are thus separated out and done before the recursive
  39# descending is started. They are now explicitly listed as the
  40# prepare rule.
  41
  42# Beautify output
  43# ---------------------------------------------------------------------------
  44#
  45# Normally, we echo the whole command before executing it. By making
  46# that echo $($(quiet)$(cmd)), we now have the possibility to set
  47# $(quiet) to choose other forms of output instead, e.g.
  48#
  49#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  50#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  51#
  52# If $(quiet) is empty, the whole command will be printed.
  53# If it is set to "quiet_", only the short version will be printed.
  54# If it is set to "silent_", nothing will be printed at all, since
  55# the variable $(silent_cmd_cc_o_c) doesn't exist.
  56#
  57# A simple variant is to prefix commands with $(Q) - that's useful
  58# for commands that shall be hidden in non-verbose mode.
  59#
  60#       $(Q)ln $@ :<
  61#
  62# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  63# If KBUILD_VERBOSE equals 1 then the above command is displayed.
  64#
  65# To put more focus on warnings, be less verbose as default
  66# Use 'make V=1' to see the full commands
  67
  68ifeq ("$(origin V)", "command line")
  69  KBUILD_VERBOSE = $(V)
  70endif
  71ifndef KBUILD_VERBOSE
  72  KBUILD_VERBOSE = 0
  73endif
  74
  75ifeq ($(KBUILD_VERBOSE),1)
  76  quiet =
  77  Q =
  78else
  79  quiet=quiet_
  80  Q = @
  81endif
  82
  83# If the user is running make -s (silent mode), suppress echoing of
  84# commands
  85
  86ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
  87ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  88  quiet=silent_
  89endif
  90else                                    # make-3.8x
  91ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  92  quiet=silent_
  93endif
  94endif
  95
  96export quiet Q KBUILD_VERBOSE
  97
  98# kbuild supports saving output files in a separate directory.
  99# To locate output files in a separate directory two syntaxes are supported.
 100# In both cases the working directory must be the root of the kernel src.
 101# 1) O=
 102# Use "make O=dir/to/store/output/files/"
 103#
 104# 2) Set KBUILD_OUTPUT
 105# Set the environment variable KBUILD_OUTPUT to point to the directory
 106# where the output files shall be placed.
 107# export KBUILD_OUTPUT=dir/to/store/output/files/
 108# make
 109#
 110# The O= assignment takes precedence over the KBUILD_OUTPUT environment
 111# variable.
 112
 113# KBUILD_SRC is set on invocation of make in OBJ directory
 114# KBUILD_SRC is not intended to be used by the regular user (for now)
 115ifeq ($(KBUILD_SRC),)
 116
 117# OK, Make called in directory where kernel src resides
 118# Do we want to locate output files in a separate directory?
 119ifeq ("$(origin O)", "command line")
 120  KBUILD_OUTPUT := $(O)
 121endif
 122
 123# That's our default target when none is given on the command line
 124PHONY := _all
 125_all:
 126
 127# Cancel implicit rules on top Makefile
 128$(CURDIR)/Makefile Makefile: ;
 129
 130ifneq ($(KBUILD_OUTPUT),)
 131# Invoke a second make in the output directory, passing relevant variables
 132# check that the output directory actually exists
 133saved-output := $(KBUILD_OUTPUT)
 134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                && /bin/pwd)
 136$(if $(KBUILD_OUTPUT),, \
 137     $(error failed to create output directory "$(saved-output)"))
 138
 139PHONY += $(MAKECMDGOALS) sub-make
 140
 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142        @:
 143
 144sub-make: FORCE
 145        $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 146        -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 147
 148# Leave processing to above invocation of make
 149skip-makefile := 1
 150endif # ifneq ($(KBUILD_OUTPUT),)
 151endif # ifeq ($(KBUILD_SRC),)
 152
 153# We process the rest of the Makefile if this is the final invocation of make
 154ifeq ($(skip-makefile),)
 155
 156# Do not print "Entering directory ...",
 157# but we want to display it when entering to the output directory
 158# so that IDEs/editors are able to understand relative filenames.
 159MAKEFLAGS += --no-print-directory
 160
 161# Call a source code checker (by default, "sparse") as part of the
 162# C compilation.
 163#
 164# Use 'make C=1' to enable checking of only re-compiled files.
 165# Use 'make C=2' to enable checking of *all* source files, regardless
 166# of whether they are re-compiled or not.
 167#
 168# See the file "Documentation/sparse.txt" for more details, including
 169# where to get the "sparse" utility.
 170
 171ifeq ("$(origin C)", "command line")
 172  KBUILD_CHECKSRC = $(C)
 173endif
 174ifndef KBUILD_CHECKSRC
 175  KBUILD_CHECKSRC = 0
 176endif
 177
 178# Use make M=dir to specify directory of external module to build
 179# Old syntax make ... SUBDIRS=$PWD is still supported
 180# Setting the environment variable KBUILD_EXTMOD take precedence
 181ifdef SUBDIRS
 182  KBUILD_EXTMOD ?= $(SUBDIRS)
 183endif
 184
 185ifeq ("$(origin M)", "command line")
 186  KBUILD_EXTMOD := $(M)
 187endif
 188
 189# If building an external module we do not care about the all: rule
 190# but instead _all depend on modules
 191PHONY += all
 192ifeq ($(KBUILD_EXTMOD),)
 193_all: all
 194else
 195_all: modules
 196endif
 197
 198ifeq ($(KBUILD_SRC),)
 199        # building in the source tree
 200        srctree := .
 201else
 202        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 203                # building in a subdirectory of the source tree
 204                srctree := ..
 205        else
 206                srctree := $(KBUILD_SRC)
 207        endif
 208endif
 209objtree         := .
 210src             := $(srctree)
 211obj             := $(objtree)
 212
 213VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 214
 215export srctree objtree VPATH
 216
 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
 338ifneq ($(CC),)
 339ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
 340COMPILER := clang
 341else
 342COMPILER := gcc
 343endif
 344export COMPILER
 345endif
 346
 347# Look for make include files relative to root of kernel src
 348MAKEFLAGS += --include-dir=$(srctree)
 349
 350# We need some generic definitions (do not try to remake the file).
 351$(srctree)/scripts/Kbuild.include: ;
 352include $(srctree)/scripts/Kbuild.include
 353
 354# Make variables (CC, etc...)
 355AS              = $(CROSS_COMPILE)as
 356LD              = $(CROSS_COMPILE)ld
 357CC              = $(CROSS_COMPILE)gcc
 358CPP             = $(CC) -E
 359AR              = $(CROSS_COMPILE)ar
 360NM              = $(CROSS_COMPILE)nm
 361STRIP           = $(CROSS_COMPILE)strip
 362OBJCOPY         = $(CROSS_COMPILE)objcopy
 363OBJDUMP         = $(CROSS_COMPILE)objdump
 364AWK             = awk
 365GENKSYMS        = scripts/genksyms/genksyms
 366INSTALLKERNEL  := installkernel
 367DEPMOD          = /sbin/depmod
 368PERL            = perl
 369PYTHON          = python
 370CHECK           = sparse
 371
 372CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 373                  -Wbitwise -Wno-return-void $(CF)
 374CFLAGS_MODULE   =
 375AFLAGS_MODULE   =
 376LDFLAGS_MODULE  =
 377CFLAGS_KERNEL   =
 378AFLAGS_KERNEL   =
 379CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 380
 381
 382# Use USERINCLUDE when you must reference the UAPI directories only.
 383USERINCLUDE    := \
 384                -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 385                -Iarch/$(hdr-arch)/include/generated/uapi \
 386                -I$(srctree)/include/uapi \
 387                -Iinclude/generated/uapi \
 388                -include $(srctree)/include/linux/kconfig.h
 389
 390# Use LINUXINCLUDE when you must reference the include/ directory.
 391# Needed to be compatible with the O= option
 392LINUXINCLUDE    := \
 393                -I$(srctree)/arch/$(hdr-arch)/include \
 394                -Iarch/$(hdr-arch)/include/generated \
 395                $(if $(KBUILD_SRC), -I$(srctree)/include) \
 396                -Iinclude \
 397                $(USERINCLUDE)
 398
 399KBUILD_CPPFLAGS := -D__KERNEL__
 400
 401KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 402                   -fno-strict-aliasing -fno-common \
 403                   -Werror-implicit-function-declaration \
 404                   -Wno-format-security \
 405                   -std=gnu89
 406
 407KBUILD_AFLAGS_KERNEL :=
 408KBUILD_CFLAGS_KERNEL :=
 409KBUILD_AFLAGS   := -D__ASSEMBLY__
 410KBUILD_AFLAGS_MODULE  := -DMODULE
 411KBUILD_CFLAGS_MODULE  := -DMODULE
 412KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 413
 414# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 415KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 416KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 417
 418export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 419export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 420export CPP AR NM STRIP OBJCOPY OBJDUMP
 421export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 422export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 423
 424export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 425export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 426export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 427export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 428export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 429export KBUILD_ARFLAGS
 430
 431# When compiling out-of-tree modules, put MODVERDIR in the module
 432# tree rather than in the kernel tree. The kernel tree might
 433# even be read-only.
 434export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 435
 436# Files to ignore in find ... statements
 437
 438export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 439                          -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 440                          -prune -o
 441export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 442                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
 443
 444# ===========================================================================
 445# Rules shared between *config targets and build targets
 446
 447# Basic helpers built in scripts/
 448PHONY += scripts_basic
 449scripts_basic:
 450        $(Q)$(MAKE) $(build)=scripts/basic
 451        $(Q)rm -f .tmp_quiet_recordmcount
 452
 453# To avoid any implicit rule to kick in, define an empty command.
 454scripts/basic/%: scripts_basic ;
 455
 456PHONY += outputmakefile
 457# outputmakefile generates a Makefile in the output directory, if using a
 458# separate output directory. This allows convenient use of make in the
 459# output directory.
 460outputmakefile:
 461ifneq ($(KBUILD_SRC),)
 462        $(Q)ln -fsn $(srctree) source
 463        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 464            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 465endif
 466
 467# Support for using generic headers in asm-generic
 468PHONY += asm-generic
 469asm-generic:
 470        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 471                    src=asm obj=arch/$(SRCARCH)/include/generated/asm
 472        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 473                    src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 474
 475# To make sure we do not include .config for any of the *config targets
 476# catch them early, and hand them over to scripts/kconfig/Makefile
 477# It is allowed to specify more targets when calling make, including
 478# mixing *config targets and build targets.
 479# For example 'make oldconfig all'.
 480# Detect when mixed targets is specified, and make a second invocation
 481# of make so .config is not included in this case either (for *config).
 482
 483version_h := include/generated/uapi/linux/version.h
 484
 485no-dot-config-targets := clean mrproper distclean \
 486                         cscope gtags TAGS tags help %docs check% coccicheck \
 487                         $(version_h) headers_% archheaders archscripts \
 488                         kernelversion %src-pkg
 489
 490config-targets := 0
 491mixed-targets  := 0
 492dot-config     := 1
 493
 494ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 495        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 496                dot-config := 0
 497        endif
 498endif
 499
 500ifeq ($(KBUILD_EXTMOD),)
 501        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 502                config-targets := 1
 503                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 504                        mixed-targets := 1
 505                endif
 506        endif
 507endif
 508
 509ifeq ($(mixed-targets),1)
 510# ===========================================================================
 511# We're called with mixed targets (*config and build targets).
 512# Handle them one by one.
 513
 514PHONY += $(MAKECMDGOALS) __build_one_by_one
 515
 516$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 517        @:
 518
 519__build_one_by_one:
 520        $(Q)set -e; \
 521        for i in $(MAKECMDGOALS); do \
 522                $(MAKE) -f $(srctree)/Makefile $$i; \
 523        done
 524
 525else
 526ifeq ($(config-targets),1)
 527# ===========================================================================
 528# *config targets only - make sure prerequisites are updated, and descend
 529# in scripts/kconfig to make the *config target
 530
 531# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 532# KBUILD_DEFCONFIG may point out an alternative default configuration
 533# used for 'make defconfig'
 534include $(srctree)/arch/$(SRCARCH)/Makefile
 535export KBUILD_DEFCONFIG KBUILD_KCONFIG
 536
 537config: scripts_basic outputmakefile FORCE
 538        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 539
 540%config: scripts_basic outputmakefile FORCE
 541        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 542
 543else
 544# ===========================================================================
 545# Build targets only - this includes vmlinux, arch specific targets, clean
 546# targets and others. In general all targets except *config targets.
 547
 548ifeq ($(KBUILD_EXTMOD),)
 549# Additional helpers built in scripts/
 550# Carefully list dependencies so we do not try to build scripts twice
 551# in parallel
 552PHONY += scripts
 553scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 554         asm-generic
 555        $(Q)$(MAKE) $(build)=$(@)
 556
 557# Objects we will link into vmlinux / subdirs we need to visit
 558init-y          := init/
 559drivers-y       := drivers/ sound/ firmware/
 560net-y           := net/
 561libs-y          := lib/
 562core-y          := usr/
 563endif # KBUILD_EXTMOD
 564
 565ifeq ($(dot-config),1)
 566# Read in config
 567-include include/config/auto.conf
 568
 569ifeq ($(KBUILD_EXTMOD),)
 570# Read in dependencies to all Kconfig* files, make sure to run
 571# oldconfig if changes are detected.
 572-include include/config/auto.conf.cmd
 573
 574# To avoid any implicit rule to kick in, define an empty command
 575$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 576
 577# If .config is newer than include/config/auto.conf, someone tinkered
 578# with it and forgot to run make oldconfig.
 579# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 580# we execute the config step to be sure to catch updated Kconfig files
 581include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 582        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 583else
 584# external modules needs include/generated/autoconf.h and include/config/auto.conf
 585# but do not care if they are up-to-date. Use auto.conf to trigger the test
 586PHONY += include/config/auto.conf
 587
 588include/config/auto.conf:
 589        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 590        echo >&2;                                                       \
 591        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 592        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 593        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 594        echo >&2 ;                                                      \
 595        /bin/false)
 596
 597endif # KBUILD_EXTMOD
 598
 599else
 600# Dummy target needed, because used as prerequisite
 601include/config/auto.conf: ;
 602endif # $(dot-config)
 603
 604# The all: target is the default when no target is given on the
 605# command line.
 606# This allow a user to issue only 'make' to build a kernel including modules
 607# Defaults to vmlinux, but the arch makefile usually adds further targets
 608all: vmlinux
 609
 610include $(srctree)/arch/$(SRCARCH)/Makefile
 611
 612KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 613
 614ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 615KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 616else
 617KBUILD_CFLAGS   += -O2
 618endif
 619
 620# Tell gcc to never replace conditional load with a non-conditional one
 621KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 622
 623ifdef CONFIG_READABLE_ASM
 624# Disable optimizations that make assembler listings hard to read.
 625# reorder blocks reorders the control in the function
 626# ipa clone creates specialized cloned functions
 627# partial inlining inlines only parts of functions
 628KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 629                 $(call cc-option,-fno-ipa-cp-clone,) \
 630                 $(call cc-option,-fno-partial-inlining)
 631endif
 632
 633ifneq ($(CONFIG_FRAME_WARN),0)
 634KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 635endif
 636
 637# Handle stack protector mode.
 638#
 639# Since kbuild can potentially perform two passes (first with the old
 640# .config values and then with updated .config values), we cannot error out
 641# if a desired compiler option is unsupported. If we were to error, kbuild
 642# could never get to the second pass and actually notice that we changed
 643# the option to something that was supported.
 644#
 645# Additionally, we don't want to fallback and/or silently change which compiler
 646# flags will be used, since that leads to producing kernels with different
 647# security feature characteristics depending on the compiler used. ("But I
 648# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
 649#
 650# The middle ground is to warn here so that the failed option is obvious, but
 651# to let the build fail with bad compiler flags so that we can't produce a
 652# kernel when there is a CONFIG and compiler mismatch.
 653#
 654ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 655  stackp-flag := -fstack-protector
 656  ifeq ($(call cc-option, $(stackp-flag)),)
 657    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
 658             -fstack-protector not supported by compiler)
 659  endif
 660else
 661ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 662  stackp-flag := -fstack-protector-strong
 663  ifeq ($(call cc-option, $(stackp-flag)),)
 664    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 665              -fstack-protector-strong not supported by compiler)
 666  endif
 667else
 668  # Force off for distro compilers that enable stack protector by default.
 669  stackp-flag := $(call cc-option, -fno-stack-protector)
 670endif
 671endif
 672KBUILD_CFLAGS += $(stackp-flag)
 673
 674ifeq ($(COMPILER),clang)
 675KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 676KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 677KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 678KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 679KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 680# Quiet clang warning: comparison of unsigned expression < 0 is always false
 681KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 682# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 683# source of a reference will be _MergedGlobals and not on of the whitelisted names.
 684# See modpost pattern 2
 685KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 686KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 687else
 688
 689# This warning generated too much noise in a regular build.
 690# Use make W=1 to enable this warning (see scripts/Makefile.build)
 691KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 692endif
 693
 694ifdef CONFIG_FRAME_POINTER
 695KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 696else
 697# Some targets (ARM with Thumb2, for example), can't be built with frame
 698# pointers.  For those, we don't have FUNCTION_TRACER automatically
 699# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 700# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 701# -fomit-frame-pointer with FUNCTION_TRACER.
 702ifndef CONFIG_FUNCTION_TRACER
 703KBUILD_CFLAGS   += -fomit-frame-pointer
 704endif
 705endif
 706
 707KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 708
 709ifdef CONFIG_DEBUG_INFO
 710ifdef CONFIG_DEBUG_INFO_SPLIT
 711KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 712else
 713KBUILD_CFLAGS   += -g
 714endif
 715KBUILD_AFLAGS   += -Wa,-gdwarf-2
 716endif
 717ifdef CONFIG_DEBUG_INFO_DWARF4
 718KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 719endif
 720
 721ifdef CONFIG_DEBUG_INFO_REDUCED
 722KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 723                   $(call cc-option,-fno-var-tracking)
 724endif
 725
 726ifdef CONFIG_FUNCTION_TRACER
 727ifdef CONFIG_HAVE_FENTRY
 728CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 729endif
 730KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
 731KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 732ifdef CONFIG_DYNAMIC_FTRACE
 733        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 734                BUILD_C_RECORDMCOUNT := y
 735                export BUILD_C_RECORDMCOUNT
 736        endif
 737endif
 738endif
 739
 740# We trigger additional mismatches with less inlining
 741ifdef CONFIG_DEBUG_SECTION_MISMATCH
 742KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 743endif
 744
 745# arch Makefile may override CC so keep this after arch Makefile is included
 746NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 747CHECKFLAGS     += $(NOSTDINC_FLAGS)
 748
 749# warn about C99 declaration after statement
 750KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 751
 752# disable pointer signed / unsigned warnings in gcc 4.0
 753KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 754
 755# disable invalid "can't wrap" optimizations for signed / pointers
 756KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 757
 758# conserve stack if available
 759KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 760
 761# disallow errors like 'EXPORT_GPL(foo);' with missing header
 762KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 763
 764# require functions to have arguments in prototypes, not empty 'int foo()'
 765KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 766
 767# Prohibit date/time macros, which would make the build non-deterministic
 768KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 769
 770# use the deterministic mode of AR if available
 771KBUILD_ARFLAGS := $(call ar-option,D)
 772
 773# check for 'asm goto'
 774ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 775        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 776endif
 777
 778include $(srctree)/scripts/Makefile.extrawarn
 779
 780# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 781KBUILD_CPPFLAGS += $(KCPPFLAGS)
 782KBUILD_AFLAGS += $(KAFLAGS)
 783KBUILD_CFLAGS += $(KCFLAGS)
 784
 785# Use --build-id when available.
 786LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 787                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 788KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 789LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 790
 791ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 792LDFLAGS_vmlinux += $(call ld-option, -X,)
 793endif
 794
 795# Default kernel image to build when no specific target is given.
 796# KBUILD_IMAGE may be overruled on the command line or
 797# set in the environment
 798# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 799# this default value
 800export KBUILD_IMAGE ?= vmlinux
 801
 802#
 803# INSTALL_PATH specifies where to place the updated kernel and system map
 804# images. Default is /boot, but you can set it to other values
 805export  INSTALL_PATH ?= /boot
 806
 807#
 808# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 809# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 810# an argument if needed. Otherwise it defaults to the kernel install path
 811#
 812export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 813
 814#
 815# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 816# relocations required by build roots.  This is not defined in the
 817# makefile but the argument can be passed to make if needed.
 818#
 819
 820MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 821export MODLIB
 822
 823#
 824# INSTALL_MOD_STRIP, if defined, will cause modules to be
 825# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 826# the default option --strip-debug will be used.  Otherwise,
 827# INSTALL_MOD_STRIP value will be used as the options to the strip command.
 828
 829ifdef INSTALL_MOD_STRIP
 830ifeq ($(INSTALL_MOD_STRIP),1)
 831mod_strip_cmd = $(STRIP) --strip-debug
 832else
 833mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 834endif # INSTALL_MOD_STRIP=1
 835else
 836mod_strip_cmd = true
 837endif # INSTALL_MOD_STRIP
 838export mod_strip_cmd
 839
 840# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 841# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 842# or CONFIG_MODULE_COMPRESS_XZ.
 843
 844mod_compress_cmd = true
 845ifdef CONFIG_MODULE_COMPRESS
 846  ifdef CONFIG_MODULE_COMPRESS_GZIP
 847    mod_compress_cmd = gzip -n
 848  endif # CONFIG_MODULE_COMPRESS_GZIP
 849  ifdef CONFIG_MODULE_COMPRESS_XZ
 850    mod_compress_cmd = xz
 851  endif # CONFIG_MODULE_COMPRESS_XZ
 852endif # CONFIG_MODULE_COMPRESS
 853export mod_compress_cmd
 854
 855# Select initial ramdisk compression format, default is gzip(1).
 856# This shall be used by the dracut(8) tool while creating an initramfs image.
 857#
 858INITRD_COMPRESS-y                  := gzip
 859INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 860INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 861INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 862INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 863INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 864# do not export INITRD_COMPRESS, since we didn't actually
 865# choose a sane default compression above.
 866# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 867
 868ifdef CONFIG_MODULE_SIG_ALL
 869MODSECKEY = ./signing_key.priv
 870MODPUBKEY = ./signing_key.x509
 871export MODPUBKEY
 872mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
 873else
 874mod_sign_cmd = true
 875endif
 876export mod_sign_cmd
 877
 878
 879ifeq ($(KBUILD_EXTMOD),)
 880core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 881
 882vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 883                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 884                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 885
 886vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 887                     $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
 888
 889init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 890core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 891drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 892net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 893libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 894libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 895libs-y          := $(libs-y1) $(libs-y2)
 896
 897# Externally visible symbols (used by link-vmlinux.sh)
 898export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 899export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 900export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 901export LDFLAGS_vmlinux
 902# used by scripts/pacmage/Makefile
 903export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
 904
 905vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 906
 907# Final link of vmlinux
 908      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 909quiet_cmd_link-vmlinux = LINK    $@
 910
 911# Include targets which we want to
 912# execute if the rest of the kernel build went well.
 913vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 914ifdef CONFIG_HEADERS_CHECK
 915        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 916endif
 917ifdef CONFIG_SAMPLES
 918        $(Q)$(MAKE) $(build)=samples
 919endif
 920ifdef CONFIG_BUILD_DOCSRC
 921        $(Q)$(MAKE) $(build)=Documentation
 922endif
 923        +$(call if_changed,link-vmlinux)
 924
 925# The actual objects are generated when descending,
 926# make sure no implicit rule kicks in
 927$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 928
 929# Handle descending into subdirectories listed in $(vmlinux-dirs)
 930# Preset locale variables to speed up the build process. Limit locale
 931# tweaks to this spot to avoid wrong language settings when running
 932# make menuconfig etc.
 933# Error messages still appears in the original language
 934
 935PHONY += $(vmlinux-dirs)
 936$(vmlinux-dirs): prepare scripts
 937        $(Q)$(MAKE) $(build)=$@
 938
 939define filechk_kernel.release
 940        echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 941endef
 942
 943# Store (new) KERNELRELEASE string in include/config/kernel.release
 944include/config/kernel.release: include/config/auto.conf FORCE
 945        $(call filechk,kernel.release)
 946
 947
 948# Things we need to do before we recursively start building the kernel
 949# or the modules are listed in "prepare".
 950# A multi level approach is used. prepareN is processed before prepareN-1.
 951# archprepare is used in arch Makefiles and when processed asm symlink,
 952# version.h and scripts_basic is processed / created.
 953
 954# Listed in dependency order
 955PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 956
 957# prepare3 is used to check if we are building in a separate output directory,
 958# and if so do:
 959# 1) Check that make has not been executed in the kernel src $(srctree)
 960prepare3: include/config/kernel.release
 961ifneq ($(KBUILD_SRC),)
 962        @$(kecho) '  Using $(srctree) as source for kernel'
 963        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 964                echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 965                echo >&2 "  in the '$(srctree)' directory.";\
 966                /bin/false; \
 967        fi;
 968endif
 969
 970# prepare2 creates a makefile if using a separate output directory
 971prepare2: prepare3 outputmakefile asm-generic
 972
 973prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 974                   include/config/auto.conf
 975        $(cmd_crmodverdir)
 976
 977archprepare: archheaders archscripts prepare1 scripts_basic
 978
 979prepare0: archprepare FORCE
 980        $(Q)$(MAKE) $(build)=.
 981
 982# All the preparing..
 983prepare: prepare0
 984
 985# Generate some files
 986# ---------------------------------------------------------------------------
 987
 988# KERNELRELEASE can change from a few different places, meaning version.h
 989# needs to be updated, so this check is forced on all builds
 990
 991uts_len := 64
 992define filechk_utsrelease.h
 993        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 994          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 995          exit 1;                                                         \
 996        fi;                                                               \
 997        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 998endef
 999
1000define filechk_version.h
1001        (echo \#define LINUX_VERSION_CODE $(shell                         \
1002        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1003        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1004endef
1005
1006$(version_h): $(srctree)/Makefile FORCE
1007        $(call filechk,version.h)
1008
1009include/generated/utsrelease.h: include/config/kernel.release FORCE
1010        $(call filechk,utsrelease.h)
1011
1012PHONY += headerdep
1013headerdep:
1014        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1015        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1016
1017# ---------------------------------------------------------------------------
1018
1019PHONY += depend dep
1020depend dep:
1021        @echo '*** Warning: make $@ is unnecessary now.'
1022
1023# ---------------------------------------------------------------------------
1024# Firmware install
1025INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1026export INSTALL_FW_PATH
1027
1028PHONY += firmware_install
1029firmware_install: FORCE
1030        @mkdir -p $(objtree)/firmware
1031        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1032
1033# ---------------------------------------------------------------------------
1034# Kernel headers
1035
1036#Default location for installed headers
1037export INSTALL_HDR_PATH = $(objtree)/usr
1038
1039hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1040
1041# If we do an all arch process set dst to asm-$(hdr-arch)
1042hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1043
1044PHONY += archheaders
1045archheaders:
1046
1047PHONY += archscripts
1048archscripts:
1049
1050PHONY += __headers
1051__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1052        $(Q)$(MAKE) $(build)=scripts build_unifdef
1053
1054PHONY += headers_install_all
1055headers_install_all:
1056        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1057
1058PHONY += headers_install
1059headers_install: __headers
1060        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1061          $(error Headers not exportable for the $(SRCARCH) architecture))
1062        $(Q)$(MAKE) $(hdr-inst)=include/uapi
1063        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1064
1065PHONY += headers_check_all
1066headers_check_all: headers_install_all
1067        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1068
1069PHONY += headers_check
1070headers_check: headers_install
1071        $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1072        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1073
1074# ---------------------------------------------------------------------------
1075# Kernel selftest
1076
1077PHONY += kselftest
1078kselftest:
1079        $(Q)$(MAKE) -C tools/testing/selftests run_tests
1080
1081# ---------------------------------------------------------------------------
1082# Modules
1083
1084ifdef CONFIG_MODULES
1085
1086# By default, build modules as well
1087
1088all: modules
1089
1090# Build modules
1091#
1092# A module can be listed more than once in obj-m resulting in
1093# duplicate lines in modules.order files.  Those are removed
1094# using awk while concatenating to the final file.
1095
1096PHONY += modules
1097modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1098        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1099        @$(kecho) '  Building modules, stage 2.';
1100        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1101        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1102
1103modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1104        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1105
1106%/modules.builtin: include/config/auto.conf
1107        $(Q)$(MAKE) $(modbuiltin)=$*
1108
1109
1110# Target to prepare building external modules
1111PHONY += modules_prepare
1112modules_prepare: prepare scripts
1113
1114# Target to install modules
1115PHONY += modules_install
1116modules_install: _modinst_ _modinst_post
1117
1118PHONY += _modinst_
1119_modinst_:
1120        @rm -rf $(MODLIB)/kernel
1121        @rm -f $(MODLIB)/source
1122        @mkdir -p $(MODLIB)/kernel
1123        @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1124        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1125                rm -f $(MODLIB)/build ; \
1126                ln -s $(CURDIR) $(MODLIB)/build ; \
1127        fi
1128        @cp -f $(objtree)/modules.order $(MODLIB)/
1129        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1130        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1131
1132# This depmod is only for convenience to give the initial
1133# boot a modules.dep even before / is mounted read-write.  However the
1134# boot script depmod is the master version.
1135PHONY += _modinst_post
1136_modinst_post: _modinst_
1137        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1138        $(call cmd,depmod)
1139
1140ifeq ($(CONFIG_MODULE_SIG), y)
1141PHONY += modules_sign
1142modules_sign:
1143        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1144endif
1145
1146else # CONFIG_MODULES
1147
1148# Modules not configured
1149# ---------------------------------------------------------------------------
1150
1151modules modules_install: FORCE
1152        @echo >&2
1153        @echo >&2 "The present kernel configuration has modules disabled."
1154        @echo >&2 "Type 'make config' and enable loadable module support."
1155        @echo >&2 "Then build a kernel with module support enabled."
1156        @echo >&2
1157        @exit 1
1158
1159endif # CONFIG_MODULES
1160
1161###
1162# Cleaning is done on three levels.
1163# make clean     Delete most generated files
1164#                Leave enough to build external modules
1165# make mrproper  Delete the current configuration, and all generated files
1166# make distclean Remove editor backup files, patch leftover files and the like
1167
1168# Directories & files removed with 'make clean'
1169CLEAN_DIRS  += $(MODVERDIR)
1170
1171# Directories & files removed with 'make mrproper'
1172MRPROPER_DIRS  += include/config usr/include include/generated          \
1173                  arch/*/include/generated .tmp_objdiff
1174MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1175                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1176                  signing_key.priv signing_key.x509 x509.genkey         \
1177                  extra_certificates signing_key.x509.keyid             \
1178                  signing_key.x509.signer include/linux/version.h
1179
1180# clean - Delete most, but leave enough to build external modules
1181#
1182clean: rm-dirs  := $(CLEAN_DIRS)
1183clean: rm-files := $(CLEAN_FILES)
1184clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1185
1186PHONY += $(clean-dirs) clean archclean vmlinuxclean
1187$(clean-dirs):
1188        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1189
1190vmlinuxclean:
1191        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1192
1193clean: archclean vmlinuxclean
1194
1195# mrproper - Delete all generated files, including .config
1196#
1197mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1198mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1199mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1200
1201PHONY += $(mrproper-dirs) mrproper archmrproper
1202$(mrproper-dirs):
1203        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1204
1205mrproper: clean archmrproper $(mrproper-dirs)
1206        $(call cmd,rmdirs)
1207        $(call cmd,rmfiles)
1208
1209# distclean
1210#
1211PHONY += distclean
1212
1213distclean: mrproper
1214        @find $(srctree) $(RCS_FIND_IGNORE) \
1215                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1216                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1217                -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1218                -type f -print | xargs rm -f
1219
1220
1221# Packaging of the kernel to various formats
1222# ---------------------------------------------------------------------------
1223# rpm target kept for backward compatibility
1224package-dir     := scripts/package
1225
1226%src-pkg: FORCE
1227        $(Q)$(MAKE) $(build)=$(package-dir) $@
1228%pkg: include/config/kernel.release FORCE
1229        $(Q)$(MAKE) $(build)=$(package-dir) $@
1230rpm: include/config/kernel.release FORCE
1231        $(Q)$(MAKE) $(build)=$(package-dir) $@
1232
1233
1234# Brief documentation of the typical targets used
1235# ---------------------------------------------------------------------------
1236
1237boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1238boards := $(notdir $(boards))
1239board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1240board-dirs := $(sort $(notdir $(board-dirs:/=)))
1241
1242help:
1243        @echo  'Cleaning targets:'
1244        @echo  '  clean           - Remove most generated files but keep the config and'
1245        @echo  '                    enough build support to build external modules'
1246        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1247        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1248        @echo  ''
1249        @echo  'Configuration targets:'
1250        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1251        @echo  ''
1252        @echo  'Other generic targets:'
1253        @echo  '  all             - Build all targets marked with [*]'
1254        @echo  '* vmlinux         - Build the bare kernel'
1255        @echo  '* modules         - Build all modules'
1256        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1257        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1258        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1259        @echo  '  dir/            - Build all files in dir and below'
1260        @echo  '  dir/file.[oisS] - Build specified target only'
1261        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1262        @echo  '                    (requires a recent binutils and recent build (System.map))'
1263        @echo  '  dir/file.ko     - Build module including final link'
1264        @echo  '  modules_prepare - Set up for building external modules'
1265        @echo  '  tags/TAGS       - Generate tags file for editors'
1266        @echo  '  cscope          - Generate cscope index'
1267        @echo  '  gtags           - Generate GNU GLOBAL index'
1268        @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1269        @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1270        @echo  '  image_name      - Output the image name (use with make -s)'
1271        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1272         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1273         echo  ''
1274        @echo  'Static analysers'
1275        @echo  '  checkstack      - Generate a list of stack hogs'
1276        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1277        @echo  '  versioncheck    - Sanity check on version.h usage'
1278        @echo  '  includecheck    - Check for duplicate included header files'
1279        @echo  '  export_report   - List the usages of all exported symbols'
1280        @echo  '  headers_check   - Sanity check on exported headers'
1281        @echo  '  headerdep       - Detect inclusion cycles in headers'
1282        @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1283        @echo  ''
1284        @echo  'Kernel selftest'
1285        @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1286        @echo  '                    Build, install, and boot kernel before'
1287        @echo  '                    running kselftest on it'
1288        @echo  ''
1289        @echo  'Kernel packaging:'
1290        @$(MAKE) $(build)=$(package-dir) help
1291        @echo  ''
1292        @echo  'Documentation targets:'
1293        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1294        @echo  ''
1295        @echo  'Architecture specific targets ($(SRCARCH)):'
1296        @$(if $(archhelp),$(archhelp),\
1297                echo '  No architecture specific help defined for $(SRCARCH)')
1298        @echo  ''
1299        @$(if $(boards), \
1300                $(foreach b, $(boards), \
1301                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1302                echo '')
1303        @$(if $(board-dirs), \
1304                $(foreach b, $(board-dirs), \
1305                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1306                printf "  %-16s - Show all of the above\\n" help-boards; \
1307                echo '')
1308
1309        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1310        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1311        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1312        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1313        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1314        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1315        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1316        @echo  '                1: warnings which may be relevant and do not occur too often'
1317        @echo  '                2: warnings which occur quite often but may still be relevant'
1318        @echo  '                3: more obscure warnings, can most likely be ignored'
1319        @echo  '                Multiple levels can be combined with W=12 or W=123'
1320        @echo  ''
1321        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1322        @echo  'For further info see the ./README file'
1323
1324
1325help-board-dirs := $(addprefix help-,$(board-dirs))
1326
1327help-boards: $(help-board-dirs)
1328
1329boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1330
1331$(help-board-dirs): help-%:
1332        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1333        @$(if $(boards-per-dir), \
1334                $(foreach b, $(boards-per-dir), \
1335                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1336                echo '')
1337
1338
1339# Documentation targets
1340# ---------------------------------------------------------------------------
1341%docs: scripts_basic FORCE
1342        $(Q)$(MAKE) $(build)=scripts build_docproc
1343        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1344
1345else # KBUILD_EXTMOD
1346
1347###
1348# External module support.
1349# When building external modules the kernel used as basis is considered
1350# read-only, and no consistency checks are made and the make
1351# system is not used on the basis kernel. If updates are required
1352# in the basis kernel ordinary make commands (without M=...) must
1353# be used.
1354#
1355# The following are the only valid targets when building external
1356# modules.
1357# make M=dir clean     Delete all automatically generated files
1358# make M=dir modules   Make all modules in specified dir
1359# make M=dir           Same as 'make M=dir modules'
1360# make M=dir modules_install
1361#                      Install the modules built in the module directory
1362#                      Assumes install directory is already created
1363
1364# We are always building modules
1365KBUILD_MODULES := 1
1366PHONY += crmodverdir
1367crmodverdir:
1368        $(cmd_crmodverdir)
1369
1370PHONY += $(objtree)/Module.symvers
1371$(objtree)/Module.symvers:
1372        @test -e $(objtree)/Module.symvers || ( \
1373        echo; \
1374        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1375        echo "           is missing; modules will have no dependencies and modversions."; \
1376        echo )
1377
1378module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1379PHONY += $(module-dirs) modules
1380$(module-dirs): crmodverdir $(objtree)/Module.symvers
1381        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1382
1383modules: $(module-dirs)
1384        @$(kecho) '  Building modules, stage 2.';
1385        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1386
1387PHONY += modules_install
1388modules_install: _emodinst_ _emodinst_post
1389
1390install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1391PHONY += _emodinst_
1392_emodinst_:
1393        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1394        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1395
1396PHONY += _emodinst_post
1397_emodinst_post: _emodinst_
1398        $(call cmd,depmod)
1399
1400clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1401
1402PHONY += $(clean-dirs) clean
1403$(clean-dirs):
1404        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1405
1406clean:  rm-dirs := $(MODVERDIR)
1407clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1408
1409help:
1410        @echo  '  Building external modules.'
1411        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1412        @echo  ''
1413        @echo  '  modules         - default target, build the module(s)'
1414        @echo  '  modules_install - install the module'
1415        @echo  '  clean           - remove generated files in module directory only'
1416        @echo  ''
1417
1418# Dummies...
1419PHONY += prepare scripts
1420prepare: ;
1421scripts: ;
1422endif # KBUILD_EXTMOD
1423
1424clean: $(clean-dirs)
1425        $(call cmd,rmdirs)
1426        $(call cmd,rmfiles)
1427        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1428                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1429                -o -name '*.ko.*' \
1430                -o -name '*.dwo'  \
1431                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1432                -o -name '*.symtypes' -o -name 'modules.order' \
1433                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1434                -o -name '*.gcno' \) -type f -print | xargs rm -f
1435
1436# Generate tags for editors
1437# ---------------------------------------------------------------------------
1438quiet_cmd_tags = GEN     $@
1439      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1440
1441tags TAGS cscope gtags: FORCE
1442        $(call cmd,tags)
1443
1444# Scripts to check various things for consistency
1445# ---------------------------------------------------------------------------
1446
1447PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1448
1449includecheck:
1450        find $(srctree)/* $(RCS_FIND_IGNORE) \
1451                -name '*.[hcS]' -type f -print | sort \
1452                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1453
1454versioncheck:
1455        find $(srctree)/* $(RCS_FIND_IGNORE) \
1456                -name '*.[hcS]' -type f -print | sort \
1457                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1458
1459coccicheck:
1460        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1461
1462namespacecheck:
1463        $(PERL) $(srctree)/scripts/namespace.pl
1464
1465export_report:
1466        $(PERL) $(srctree)/scripts/export_report.pl
1467
1468endif #ifeq ($(config-targets),1)
1469endif #ifeq ($(mixed-targets),1)
1470
1471PHONY += checkstack kernelrelease kernelversion image_name
1472
1473# UML needs a little special treatment here.  It wants to use the host
1474# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1475# else wants $(ARCH), including people doing cross-builds, which means
1476# that $(SUBARCH) doesn't work here.
1477ifeq ($(ARCH), um)
1478CHECKSTACK_ARCH := $(SUBARCH)
1479else
1480CHECKSTACK_ARCH := $(ARCH)
1481endif
1482checkstack:
1483        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1484        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1485
1486kernelrelease:
1487        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1488
1489kernelversion:
1490        @echo $(KERNELVERSION)
1491
1492image_name:
1493        @echo $(KBUILD_IMAGE)
1494
1495# Clear a bunch of variables before executing the submake
1496tools/: FORCE
1497        $(Q)mkdir -p $(objtree)/tools
1498        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1499
1500tools/%: FORCE
1501        $(Q)mkdir -p $(objtree)/tools
1502        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1503
1504# Single targets
1505# ---------------------------------------------------------------------------
1506# Single targets are compatible with:
1507# - build with mixed source and output
1508# - build with separate output dir 'make O=...'
1509# - external modules
1510#
1511#  target-dir => where to store outputfile
1512#  build-dir  => directory in kernel source tree to use
1513
1514ifeq ($(KBUILD_EXTMOD),)
1515        build-dir  = $(patsubst %/,%,$(dir $@))
1516        target-dir = $(dir $@)
1517else
1518        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1519        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1520        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1521endif
1522
1523%.s: %.c prepare scripts FORCE
1524        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525%.i: %.c prepare scripts FORCE
1526        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527%.o: %.c prepare scripts FORCE
1528        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529%.lst: %.c prepare scripts FORCE
1530        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531%.s: %.S prepare scripts FORCE
1532        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533%.o: %.S prepare scripts FORCE
1534        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535%.symtypes: %.c prepare scripts FORCE
1536        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537
1538# Modules
1539/: prepare scripts FORCE
1540        $(cmd_crmodverdir)
1541        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1542        $(build)=$(build-dir)
1543# Make sure the latest headers are built for Documentation
1544Documentation/: headers_install
1545%/: prepare scripts FORCE
1546        $(cmd_crmodverdir)
1547        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1548        $(build)=$(build-dir)
1549%.ko: prepare scripts FORCE
1550        $(cmd_crmodverdir)
1551        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1552        $(build)=$(build-dir) $(@:.ko=.o)
1553        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1554
1555# FIXME Should go into a make.lib or something
1556# ===========================================================================
1557
1558quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1559      cmd_rmdirs = rm -rf $(rm-dirs)
1560
1561quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1562      cmd_rmfiles = rm -f $(rm-files)
1563
1564# Run depmod only if we have System.map and depmod is executable
1565quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1566      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1567                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1568
1569# Create temporary dir for module support files
1570# clean it up only when building all modules
1571cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1572                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1573
1574# read all saved command lines
1575
1576targets := $(wildcard $(sort $(targets)))
1577cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1578
1579ifneq ($(cmd_files),)
1580  $(cmd_files): ;       # Do not try to update included dependency files
1581  include $(cmd_files)
1582endif
1583
1584# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1585# Usage:
1586# $(Q)$(MAKE) $(clean)=dir
1587clean := -f $(srctree)/scripts/Makefile.clean obj
1588
1589endif   # skip-makefile
1590
1591PHONY += FORCE
1592FORCE:
1593
1594# Declare the contents of the .PHONY variable as phony.  We keep that
1595# information in a variable so we can use it in if_changed and friends.
1596.PHONY: $(PHONY)
1597