linux/Makefile
<<
>>
Prefs
   1VERSION = 3
   2PATCHLEVEL = 13
   3SUBLEVEL = 5
   4EXTRAVERSION =
   5NAME = One Giant Leap for Frogkind
   6
   7# *DOCUMENTATION*
   8# To see a list of typical targets execute "make help"
   9# More info can be located in ./README
  10# Comments in this file are targeted only to the developer, do not
  11# expect to learn how to build the kernel reading this file.
  12
  13# Do not:
  14# o  use make's built-in rules and variables
  15#    (this increases performance and avoids hard-to-debug behaviour);
  16# o  print "Entering directory ...";
  17MAKEFLAGS += -rR --no-print-directory
  18
  19# Avoid funny character set dependencies
  20unexport LC_ALL
  21LC_COLLATE=C
  22LC_NUMERIC=C
  23export LC_COLLATE LC_NUMERIC
  24
  25# Avoid interference with shell env settings
  26unexport GREP_OPTIONS
  27
  28# We are using a recursive build, so we need to do a little thinking
  29# to get the ordering right.
  30#
  31# Most importantly: sub-Makefiles should only ever modify files in
  32# their own directory. If in some directory we have a dependency on
  33# a file in another dir (which doesn't happen often, but it's often
  34# unavoidable when linking the built-in.o targets which finally
  35# turn into vmlinux), we will call a sub make in that other dir, and
  36# after that we are sure that everything which is in that other dir
  37# is now up to date.
  38#
  39# The only cases where we need to modify files which have global
  40# effects are thus separated out and done before the recursive
  41# descending is started. They are now explicitly listed as the
  42# prepare rule.
  43
  44# To put more focus on warnings, be less verbose as default
  45# Use 'make V=1' to see the full commands
  46
  47ifeq ("$(origin V)", "command line")
  48  KBUILD_VERBOSE = $(V)
  49endif
  50ifndef KBUILD_VERBOSE
  51  KBUILD_VERBOSE = 0
  52endif
  53
  54# Call a source code checker (by default, "sparse") as part of the
  55# C compilation.
  56#
  57# Use 'make C=1' to enable checking of only re-compiled files.
  58# Use 'make C=2' to enable checking of *all* source files, regardless
  59# of whether they are re-compiled or not.
  60#
  61# See the file "Documentation/sparse.txt" for more details, including
  62# where to get the "sparse" utility.
  63
  64ifeq ("$(origin C)", "command line")
  65  KBUILD_CHECKSRC = $(C)
  66endif
  67ifndef KBUILD_CHECKSRC
  68  KBUILD_CHECKSRC = 0
  69endif
  70
  71# Use make M=dir to specify directory of external module to build
  72# Old syntax make ... SUBDIRS=$PWD is still supported
  73# Setting the environment variable KBUILD_EXTMOD take precedence
  74ifdef SUBDIRS
  75  KBUILD_EXTMOD ?= $(SUBDIRS)
  76endif
  77
  78ifeq ("$(origin M)", "command line")
  79  KBUILD_EXTMOD := $(M)
  80endif
  81
  82# kbuild supports saving output files in a separate directory.
  83# To locate output files in a separate directory two syntaxes are supported.
  84# In both cases the working directory must be the root of the kernel src.
  85# 1) O=
  86# Use "make O=dir/to/store/output/files/"
  87#
  88# 2) Set KBUILD_OUTPUT
  89# Set the environment variable KBUILD_OUTPUT to point to the directory
  90# where the output files shall be placed.
  91# export KBUILD_OUTPUT=dir/to/store/output/files/
  92# make
  93#
  94# The O= assignment takes precedence over the KBUILD_OUTPUT environment
  95# variable.
  96
  97
  98# KBUILD_SRC is set on invocation of make in OBJ directory
  99# KBUILD_SRC is not intended to be used by the regular user (for now)
 100ifeq ($(KBUILD_SRC),)
 101
 102# OK, Make called in directory where kernel src resides
 103# Do we want to locate output files in a separate directory?
 104ifeq ("$(origin O)", "command line")
 105  KBUILD_OUTPUT := $(O)
 106endif
 107
 108ifeq ("$(origin W)", "command line")
 109  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 110endif
 111
 112# That's our default target when none is given on the command line
 113PHONY := _all
 114_all:
 115
 116# Cancel implicit rules on top Makefile
 117$(CURDIR)/Makefile Makefile: ;
 118
 119ifneq ($(KBUILD_OUTPUT),)
 120# Invoke a second make in the output directory, passing relevant variables
 121# check that the output directory actually exists
 122saved-output := $(KBUILD_OUTPUT)
 123KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 124$(if $(KBUILD_OUTPUT),, \
 125     $(error output directory "$(saved-output)" does not exist))
 126
 127PHONY += $(MAKECMDGOALS) sub-make
 128
 129$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 130        @:
 131
 132sub-make: FORCE
 133        $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 134        KBUILD_SRC=$(CURDIR) \
 135        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 136        $(filter-out _all sub-make,$(MAKECMDGOALS))
 137
 138# Leave processing to above invocation of make
 139skip-makefile := 1
 140endif # ifneq ($(KBUILD_OUTPUT),)
 141endif # ifeq ($(KBUILD_SRC),)
 142
 143# We process the rest of the Makefile if this is the final invocation of make
 144ifeq ($(skip-makefile),)
 145
 146# If building an external module we do not care about the all: rule
 147# but instead _all depend on modules
 148PHONY += all
 149ifeq ($(KBUILD_EXTMOD),)
 150_all: all
 151else
 152_all: modules
 153endif
 154
 155srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 156objtree         := $(CURDIR)
 157src             := $(srctree)
 158obj             := $(objtree)
 159
 160VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 161
 162export srctree objtree VPATH
 163
 164
 165# SUBARCH tells the usermode build what the underlying arch is.  That is set
 166# first, and if a usermode build is happening, the "ARCH=um" on the command
 167# line overrides the setting of ARCH below.  If a native build is happening,
 168# then ARCH is assigned, getting whatever value it gets normally, and 
 169# SUBARCH is subsequently ignored.
 170
 171SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 172                                  -e s/sun4u/sparc64/ \
 173                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 174                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 175                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 176                                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 177
 178# Cross compiling and selecting different set of gcc/bin-utils
 179# ---------------------------------------------------------------------------
 180#
 181# When performing cross compilation for other architectures ARCH shall be set
 182# to the target architecture. (See arch/* for the possibilities).
 183# ARCH can be set during invocation of make:
 184# make ARCH=ia64
 185# Another way is to have ARCH set in the environment.
 186# The default ARCH is the host where make is executed.
 187
 188# CROSS_COMPILE specify the prefix used for all executables used
 189# during compilation. Only gcc and related bin-utils executables
 190# are prefixed with $(CROSS_COMPILE).
 191# CROSS_COMPILE can be set on the command line
 192# make CROSS_COMPILE=ia64-linux-
 193# Alternatively CROSS_COMPILE can be set in the environment.
 194# A third alternative is to store a setting in .config so that plain
 195# "make" in the configured kernel build directory always uses that.
 196# Default value for CROSS_COMPILE is not to prefix executables
 197# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 198ARCH            ?= $(SUBARCH)
 199CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 200
 201# Architecture as present in compile.h
 202UTS_MACHINE     := $(ARCH)
 203SRCARCH         := $(ARCH)
 204
 205# Additional ARCH settings for x86
 206ifeq ($(ARCH),i386)
 207        SRCARCH := x86
 208endif
 209ifeq ($(ARCH),x86_64)
 210        SRCARCH := x86
 211endif
 212
 213# Additional ARCH settings for sparc
 214ifeq ($(ARCH),sparc32)
 215       SRCARCH := sparc
 216endif
 217ifeq ($(ARCH),sparc64)
 218       SRCARCH := sparc
 219endif
 220
 221# Additional ARCH settings for sh
 222ifeq ($(ARCH),sh64)
 223       SRCARCH := sh
 224endif
 225
 226# Additional ARCH settings for tile
 227ifeq ($(ARCH),tilepro)
 228       SRCARCH := tile
 229endif
 230ifeq ($(ARCH),tilegx)
 231       SRCARCH := tile
 232endif
 233
 234# Where to locate arch specific headers
 235hdr-arch  := $(SRCARCH)
 236
 237KCONFIG_CONFIG  ?= .config
 238export KCONFIG_CONFIG
 239
 240# SHELL used by kbuild
 241CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 242          else if [ -x /bin/bash ]; then echo /bin/bash; \
 243          else echo sh; fi ; fi)
 244
 245HOSTCC       = gcc
 246HOSTCXX      = g++
 247HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 248HOSTCXXFLAGS = -O2
 249
 250# Decide whether to build built-in, modular, or both.
 251# Normally, just do built-in.
 252
 253KBUILD_MODULES :=
 254KBUILD_BUILTIN := 1
 255
 256#       If we have only "make modules", don't compile built-in objects.
 257#       When we're building modules with modversions, we need to consider
 258#       the built-in objects during the descend as well, in order to
 259#       make sure the checksums are up to date before we record them.
 260
 261ifeq ($(MAKECMDGOALS),modules)
 262  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 263endif
 264
 265#       If we have "make <whatever> modules", compile modules
 266#       in addition to whatever we do anyway.
 267#       Just "make" or "make all" shall build modules as well
 268
 269ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 270  KBUILD_MODULES := 1
 271endif
 272
 273ifeq ($(MAKECMDGOALS),)
 274  KBUILD_MODULES := 1
 275endif
 276
 277export KBUILD_MODULES KBUILD_BUILTIN
 278export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 279
 280# Beautify output
 281# ---------------------------------------------------------------------------
 282#
 283# Normally, we echo the whole command before executing it. By making
 284# that echo $($(quiet)$(cmd)), we now have the possibility to set
 285# $(quiet) to choose other forms of output instead, e.g.
 286#
 287#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 288#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 289#
 290# If $(quiet) is empty, the whole command will be printed.
 291# If it is set to "quiet_", only the short version will be printed. 
 292# If it is set to "silent_", nothing will be printed at all, since
 293# the variable $(silent_cmd_cc_o_c) doesn't exist.
 294#
 295# A simple variant is to prefix commands with $(Q) - that's useful
 296# for commands that shall be hidden in non-verbose mode.
 297#
 298#       $(Q)ln $@ :<
 299#
 300# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 301# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 302
 303ifeq ($(KBUILD_VERBOSE),1)
 304  quiet =
 305  Q =
 306else
 307  quiet=quiet_
 308  Q = @
 309endif
 310
 311# If the user is running make -s (silent mode), suppress echoing of
 312# commands
 313
 314ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 315  quiet=silent_
 316endif
 317
 318export quiet Q KBUILD_VERBOSE
 319
 320
 321# Look for make include files relative to root of kernel src
 322MAKEFLAGS += --include-dir=$(srctree)
 323
 324# We need some generic definitions (do not try to remake the file).
 325$(srctree)/scripts/Kbuild.include: ;
 326include $(srctree)/scripts/Kbuild.include
 327
 328# Make variables (CC, etc...)
 329
 330AS              = $(CROSS_COMPILE)as
 331LD              = $(CROSS_COMPILE)ld
 332CC              = $(CROSS_COMPILE)gcc
 333CPP             = $(CC) -E
 334AR              = $(CROSS_COMPILE)ar
 335NM              = $(CROSS_COMPILE)nm
 336STRIP           = $(CROSS_COMPILE)strip
 337OBJCOPY         = $(CROSS_COMPILE)objcopy
 338OBJDUMP         = $(CROSS_COMPILE)objdump
 339AWK             = awk
 340GENKSYMS        = scripts/genksyms/genksyms
 341INSTALLKERNEL  := installkernel
 342DEPMOD          = /sbin/depmod
 343PERL            = perl
 344CHECK           = sparse
 345
 346CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 347                  -Wbitwise -Wno-return-void $(CF)
 348CFLAGS_MODULE   =
 349AFLAGS_MODULE   =
 350LDFLAGS_MODULE  =
 351CFLAGS_KERNEL   =
 352AFLAGS_KERNEL   =
 353CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 354
 355
 356# Use USERINCLUDE when you must reference the UAPI directories only.
 357USERINCLUDE    := \
 358                -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 359                -Iarch/$(hdr-arch)/include/generated/uapi \
 360                -I$(srctree)/include/uapi \
 361                -Iinclude/generated/uapi \
 362                -include $(srctree)/include/linux/kconfig.h
 363
 364# Use LINUXINCLUDE when you must reference the include/ directory.
 365# Needed to be compatible with the O= option
 366LINUXINCLUDE    := \
 367                -I$(srctree)/arch/$(hdr-arch)/include \
 368                -Iarch/$(hdr-arch)/include/generated \
 369                $(if $(KBUILD_SRC), -I$(srctree)/include) \
 370                -Iinclude \
 371                $(USERINCLUDE)
 372
 373KBUILD_CPPFLAGS := -D__KERNEL__
 374
 375KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 376                   -fno-strict-aliasing -fno-common \
 377                   -Werror-implicit-function-declaration \
 378                   -Wno-format-security \
 379                   -fno-delete-null-pointer-checks
 380KBUILD_AFLAGS_KERNEL :=
 381KBUILD_CFLAGS_KERNEL :=
 382KBUILD_AFLAGS   := -D__ASSEMBLY__
 383KBUILD_AFLAGS_MODULE  := -DMODULE
 384KBUILD_CFLAGS_MODULE  := -DMODULE
 385KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 386
 387# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 388KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 389KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 390
 391export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 392export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 393export CPP AR NM STRIP OBJCOPY OBJDUMP
 394export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 395export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 396
 397export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 398export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 399export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 400export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 401export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 402export KBUILD_ARFLAGS
 403
 404# When compiling out-of-tree modules, put MODVERDIR in the module
 405# tree rather than in the kernel tree. The kernel tree might
 406# even be read-only.
 407export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 408
 409# Files to ignore in find ... statements
 410
 411RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
 412                   -o -name .pc -o -name .hg -o -name .git \) -prune -o
 413export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 414                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
 415
 416# ===========================================================================
 417# Rules shared between *config targets and build targets
 418
 419# Basic helpers built in scripts/
 420PHONY += scripts_basic
 421scripts_basic:
 422        $(Q)$(MAKE) $(build)=scripts/basic
 423        $(Q)rm -f .tmp_quiet_recordmcount
 424
 425# To avoid any implicit rule to kick in, define an empty command.
 426scripts/basic/%: scripts_basic ;
 427
 428PHONY += outputmakefile
 429# outputmakefile generates a Makefile in the output directory, if using a
 430# separate output directory. This allows convenient use of make in the
 431# output directory.
 432outputmakefile:
 433ifneq ($(KBUILD_SRC),)
 434        $(Q)ln -fsn $(srctree) source
 435        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 436            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 437endif
 438
 439# Support for using generic headers in asm-generic
 440PHONY += asm-generic
 441asm-generic:
 442        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 443                    src=asm obj=arch/$(SRCARCH)/include/generated/asm
 444        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 445                    src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 446
 447# To make sure we do not include .config for any of the *config targets
 448# catch them early, and hand them over to scripts/kconfig/Makefile
 449# It is allowed to specify more targets when calling make, including
 450# mixing *config targets and build targets.
 451# For example 'make oldconfig all'.
 452# Detect when mixed targets is specified, and make a second invocation
 453# of make so .config is not included in this case either (for *config).
 454
 455version_h := include/generated/uapi/linux/version.h
 456
 457no-dot-config-targets := clean mrproper distclean \
 458                         cscope gtags TAGS tags help %docs check% coccicheck \
 459                         $(version_h) headers_% archheaders archscripts \
 460                         kernelversion %src-pkg
 461
 462config-targets := 0
 463mixed-targets  := 0
 464dot-config     := 1
 465
 466ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 467        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 468                dot-config := 0
 469        endif
 470endif
 471
 472ifeq ($(KBUILD_EXTMOD),)
 473        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 474                config-targets := 1
 475                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 476                        mixed-targets := 1
 477                endif
 478        endif
 479endif
 480
 481ifeq ($(mixed-targets),1)
 482# ===========================================================================
 483# We're called with mixed targets (*config and build targets).
 484# Handle them one by one.
 485
 486%:: FORCE
 487        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 488
 489else
 490ifeq ($(config-targets),1)
 491# ===========================================================================
 492# *config targets only - make sure prerequisites are updated, and descend
 493# in scripts/kconfig to make the *config target
 494
 495# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 496# KBUILD_DEFCONFIG may point out an alternative default configuration
 497# used for 'make defconfig'
 498include $(srctree)/arch/$(SRCARCH)/Makefile
 499export KBUILD_DEFCONFIG KBUILD_KCONFIG
 500
 501config: scripts_basic outputmakefile FORCE
 502        $(Q)mkdir -p include/linux include/config
 503        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 504
 505%config: scripts_basic outputmakefile FORCE
 506        $(Q)mkdir -p include/linux include/config
 507        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 508
 509else
 510# ===========================================================================
 511# Build targets only - this includes vmlinux, arch specific targets, clean
 512# targets and others. In general all targets except *config targets.
 513
 514ifeq ($(KBUILD_EXTMOD),)
 515# Additional helpers built in scripts/
 516# Carefully list dependencies so we do not try to build scripts twice
 517# in parallel
 518PHONY += scripts
 519scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 520         asm-generic
 521        $(Q)$(MAKE) $(build)=$(@)
 522
 523# Objects we will link into vmlinux / subdirs we need to visit
 524init-y          := init/
 525drivers-y       := drivers/ sound/ firmware/
 526net-y           := net/
 527libs-y          := lib/
 528core-y          := usr/
 529endif # KBUILD_EXTMOD
 530
 531ifeq ($(dot-config),1)
 532# Read in config
 533-include include/config/auto.conf
 534
 535ifeq ($(KBUILD_EXTMOD),)
 536# Read in dependencies to all Kconfig* files, make sure to run
 537# oldconfig if changes are detected.
 538-include include/config/auto.conf.cmd
 539
 540# To avoid any implicit rule to kick in, define an empty command
 541$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 542
 543# If .config is newer than include/config/auto.conf, someone tinkered
 544# with it and forgot to run make oldconfig.
 545# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 546# we execute the config step to be sure to catch updated Kconfig files
 547include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 548        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 549else
 550# external modules needs include/generated/autoconf.h and include/config/auto.conf
 551# but do not care if they are up-to-date. Use auto.conf to trigger the test
 552PHONY += include/config/auto.conf
 553
 554include/config/auto.conf:
 555        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 556        echo >&2;                                                       \
 557        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 558        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 559        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 560        echo >&2 ;                                                      \
 561        /bin/false)
 562
 563endif # KBUILD_EXTMOD
 564
 565else
 566# Dummy target needed, because used as prerequisite
 567include/config/auto.conf: ;
 568endif # $(dot-config)
 569
 570# The all: target is the default when no target is given on the
 571# command line.
 572# This allow a user to issue only 'make' to build a kernel including modules
 573# Defaults to vmlinux, but the arch makefile usually adds further targets
 574all: vmlinux
 575
 576ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 577KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 578else
 579KBUILD_CFLAGS   += -O2
 580endif
 581
 582include $(srctree)/arch/$(SRCARCH)/Makefile
 583
 584ifdef CONFIG_READABLE_ASM
 585# Disable optimizations that make assembler listings hard to read.
 586# reorder blocks reorders the control in the function
 587# ipa clone creates specialized cloned functions
 588# partial inlining inlines only parts of functions
 589KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 590                 $(call cc-option,-fno-ipa-cp-clone,) \
 591                 $(call cc-option,-fno-partial-inlining)
 592endif
 593
 594ifneq ($(CONFIG_FRAME_WARN),0)
 595KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 596endif
 597
 598# Force gcc to behave correct even for buggy distributions
 599ifndef CONFIG_CC_STACKPROTECTOR
 600KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 601endif
 602
 603# This warning generated too much noise in a regular build.
 604# Use make W=1 to enable this warning (see scripts/Makefile.build)
 605KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 606
 607ifdef CONFIG_FRAME_POINTER
 608KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 609else
 610# Some targets (ARM with Thumb2, for example), can't be built with frame
 611# pointers.  For those, we don't have FUNCTION_TRACER automatically
 612# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 613# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 614# -fomit-frame-pointer with FUNCTION_TRACER.
 615ifndef CONFIG_FUNCTION_TRACER
 616KBUILD_CFLAGS   += -fomit-frame-pointer
 617endif
 618endif
 619
 620ifdef CONFIG_DEBUG_INFO
 621KBUILD_CFLAGS   += -g
 622KBUILD_AFLAGS   += -gdwarf-2
 623endif
 624
 625ifdef CONFIG_DEBUG_INFO_REDUCED
 626KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 627                   $(call cc-option,-fno-var-tracking)
 628endif
 629
 630ifdef CONFIG_FUNCTION_TRACER
 631ifdef CONFIG_HAVE_FENTRY
 632CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 633endif
 634KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
 635KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 636ifdef CONFIG_DYNAMIC_FTRACE
 637        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 638                BUILD_C_RECORDMCOUNT := y
 639                export BUILD_C_RECORDMCOUNT
 640        endif
 641endif
 642endif
 643
 644# We trigger additional mismatches with less inlining
 645ifdef CONFIG_DEBUG_SECTION_MISMATCH
 646KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 647endif
 648
 649# arch Makefile may override CC so keep this after arch Makefile is included
 650NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 651CHECKFLAGS     += $(NOSTDINC_FLAGS)
 652
 653# warn about C99 declaration after statement
 654KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 655
 656# disable pointer signed / unsigned warnings in gcc 4.0
 657KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 658
 659# disable invalid "can't wrap" optimizations for signed / pointers
 660KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 661
 662# conserve stack if available
 663KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 664
 665# disallow errors like 'EXPORT_GPL(foo);' with missing header
 666KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 667
 668# require functions to have arguments in prototypes, not empty 'int foo()'
 669KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 670
 671# use the deterministic mode of AR if available
 672KBUILD_ARFLAGS := $(call ar-option,D)
 673
 674# check for 'asm goto'
 675ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 676        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 677endif
 678
 679# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 680KBUILD_CPPFLAGS += $(KCPPFLAGS)
 681KBUILD_AFLAGS += $(KAFLAGS)
 682KBUILD_CFLAGS += $(KCFLAGS)
 683
 684# Use --build-id when available.
 685LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 686                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 687KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 688LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 689
 690ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 691LDFLAGS_vmlinux += $(call ld-option, -X,)
 692endif
 693
 694# Default kernel image to build when no specific target is given.
 695# KBUILD_IMAGE may be overruled on the command line or
 696# set in the environment
 697# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 698# this default value
 699export KBUILD_IMAGE ?= vmlinux
 700
 701#
 702# INSTALL_PATH specifies where to place the updated kernel and system map
 703# images. Default is /boot, but you can set it to other values
 704export  INSTALL_PATH ?= /boot
 705
 706#
 707# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 708# relocations required by build roots.  This is not defined in the
 709# makefile but the argument can be passed to make if needed.
 710#
 711
 712MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 713export MODLIB
 714
 715#
 716#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 717#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 718#  the default option --strip-debug will be used.  Otherwise,
 719#  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 720
 721ifdef INSTALL_MOD_STRIP
 722ifeq ($(INSTALL_MOD_STRIP),1)
 723mod_strip_cmd = $(STRIP) --strip-debug
 724else
 725mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 726endif # INSTALL_MOD_STRIP=1
 727else
 728mod_strip_cmd = true
 729endif # INSTALL_MOD_STRIP
 730export mod_strip_cmd
 731
 732# Select initial ramdisk compression format, default is gzip(1).
 733# This shall be used by the dracut(8) tool while creating an initramfs image.
 734#
 735INITRD_COMPRESS-y                  := gzip
 736INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 737INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 738INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 739INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 740INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 741# do not export INITRD_COMPRESS, since we didn't actually
 742# choose a sane default compression above.
 743# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 744
 745ifdef CONFIG_MODULE_SIG_ALL
 746MODSECKEY = ./signing_key.priv
 747MODPUBKEY = ./signing_key.x509
 748export MODPUBKEY
 749mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
 750else
 751mod_sign_cmd = true
 752endif
 753export mod_sign_cmd
 754
 755
 756ifeq ($(KBUILD_EXTMOD),)
 757core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 758
 759vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 760                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 761                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 762
 763vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 764                     $(init-n) $(init-) \
 765                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 766                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 767
 768init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 769core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 770drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 771net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 772libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 773libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 774libs-y          := $(libs-y1) $(libs-y2)
 775
 776# Externally visible symbols (used by link-vmlinux.sh)
 777export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 778export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 779export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 780export LDFLAGS_vmlinux
 781# used by scripts/pacmage/Makefile
 782export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
 783
 784vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 785
 786# Final link of vmlinux
 787      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 788quiet_cmd_link-vmlinux = LINK    $@
 789
 790# Include targets which we want to
 791# execute if the rest of the kernel build went well.
 792vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 793ifdef CONFIG_HEADERS_CHECK
 794        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 795endif
 796ifdef CONFIG_SAMPLES
 797        $(Q)$(MAKE) $(build)=samples
 798endif
 799ifdef CONFIG_BUILD_DOCSRC
 800        $(Q)$(MAKE) $(build)=Documentation
 801endif
 802        +$(call if_changed,link-vmlinux)
 803
 804# The actual objects are generated when descending, 
 805# make sure no implicit rule kicks in
 806$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 807
 808# Handle descending into subdirectories listed in $(vmlinux-dirs)
 809# Preset locale variables to speed up the build process. Limit locale
 810# tweaks to this spot to avoid wrong language settings when running
 811# make menuconfig etc.
 812# Error messages still appears in the original language
 813
 814PHONY += $(vmlinux-dirs)
 815$(vmlinux-dirs): prepare scripts
 816        $(Q)$(MAKE) $(build)=$@
 817
 818define filechk_kernel.release
 819        echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 820endef
 821
 822# Store (new) KERNELRELEASE string in include/config/kernel.release
 823include/config/kernel.release: include/config/auto.conf FORCE
 824        $(call filechk,kernel.release)
 825
 826
 827# Things we need to do before we recursively start building the kernel
 828# or the modules are listed in "prepare".
 829# A multi level approach is used. prepareN is processed before prepareN-1.
 830# archprepare is used in arch Makefiles and when processed asm symlink,
 831# version.h and scripts_basic is processed / created.
 832
 833# Listed in dependency order
 834PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 835
 836# prepare3 is used to check if we are building in a separate output directory,
 837# and if so do:
 838# 1) Check that make has not been executed in the kernel src $(srctree)
 839prepare3: include/config/kernel.release
 840ifneq ($(KBUILD_SRC),)
 841        @$(kecho) '  Using $(srctree) as source for kernel'
 842        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 843                echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 844                echo >&2 "  in the '$(srctree)' directory.";\
 845                /bin/false; \
 846        fi;
 847endif
 848
 849# prepare2 creates a makefile if using a separate output directory
 850prepare2: prepare3 outputmakefile asm-generic
 851
 852prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 853                   include/config/auto.conf
 854        $(cmd_crmodverdir)
 855
 856archprepare: archheaders archscripts prepare1 scripts_basic
 857
 858prepare0: archprepare FORCE
 859        $(Q)$(MAKE) $(build)=.
 860
 861# All the preparing..
 862prepare: prepare0
 863
 864# Generate some files
 865# ---------------------------------------------------------------------------
 866
 867# KERNELRELEASE can change from a few different places, meaning version.h
 868# needs to be updated, so this check is forced on all builds
 869
 870uts_len := 64
 871define filechk_utsrelease.h
 872        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 873          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 874          exit 1;                                                         \
 875        fi;                                                               \
 876        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 877endef
 878
 879define filechk_version.h
 880        (echo \#define LINUX_VERSION_CODE $(shell                         \
 881        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 882        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 883endef
 884
 885$(version_h): $(srctree)/Makefile FORCE
 886        $(call filechk,version.h)
 887
 888include/generated/utsrelease.h: include/config/kernel.release FORCE
 889        $(call filechk,utsrelease.h)
 890
 891PHONY += headerdep
 892headerdep:
 893        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 894        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 895
 896# ---------------------------------------------------------------------------
 897
 898PHONY += depend dep
 899depend dep:
 900        @echo '*** Warning: make $@ is unnecessary now.'
 901
 902# ---------------------------------------------------------------------------
 903# Firmware install
 904INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 905export INSTALL_FW_PATH
 906
 907PHONY += firmware_install
 908firmware_install: FORCE
 909        @mkdir -p $(objtree)/firmware
 910        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 911
 912# ---------------------------------------------------------------------------
 913# Kernel headers
 914
 915#Default location for installed headers
 916export INSTALL_HDR_PATH = $(objtree)/usr
 917
 918hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 919
 920# If we do an all arch process set dst to asm-$(hdr-arch)
 921hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 922
 923PHONY += archheaders
 924archheaders:
 925
 926PHONY += archscripts
 927archscripts:
 928
 929PHONY += __headers
 930__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
 931        $(Q)$(MAKE) $(build)=scripts build_unifdef
 932
 933PHONY += headers_install_all
 934headers_install_all:
 935        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
 936
 937PHONY += headers_install
 938headers_install: __headers
 939        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
 940          $(error Headers not exportable for the $(SRCARCH) architecture))
 941        $(Q)$(MAKE) $(hdr-inst)=include/uapi
 942        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
 943
 944PHONY += headers_check_all
 945headers_check_all: headers_install_all
 946        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
 947
 948PHONY += headers_check
 949headers_check: headers_install
 950        $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
 951        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
 952
 953# ---------------------------------------------------------------------------
 954# Modules
 955
 956ifdef CONFIG_MODULES
 957
 958# By default, build modules as well
 959
 960all: modules
 961
 962#       Build modules
 963#
 964#       A module can be listed more than once in obj-m resulting in
 965#       duplicate lines in modules.order files.  Those are removed
 966#       using awk while concatenating to the final file.
 967
 968PHONY += modules
 969modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
 970        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
 971        @$(kecho) '  Building modules, stage 2.';
 972        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 973        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
 974
 975modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
 976        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
 977
 978%/modules.builtin: include/config/auto.conf
 979        $(Q)$(MAKE) $(modbuiltin)=$*
 980
 981
 982# Target to prepare building external modules
 983PHONY += modules_prepare
 984modules_prepare: prepare scripts
 985
 986# Target to install modules
 987PHONY += modules_install
 988modules_install: _modinst_ _modinst_post
 989
 990PHONY += _modinst_
 991_modinst_:
 992        @rm -rf $(MODLIB)/kernel
 993        @rm -f $(MODLIB)/source
 994        @mkdir -p $(MODLIB)/kernel
 995        @ln -s $(srctree) $(MODLIB)/source
 996        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 997                rm -f $(MODLIB)/build ; \
 998                ln -s $(objtree) $(MODLIB)/build ; \
 999        fi
1000        @cp -f $(objtree)/modules.order $(MODLIB)/
1001        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1002        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1003
1004# This depmod is only for convenience to give the initial
1005# boot a modules.dep even before / is mounted read-write.  However the
1006# boot script depmod is the master version.
1007PHONY += _modinst_post
1008_modinst_post: _modinst_
1009        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1010        $(call cmd,depmod)
1011
1012ifeq ($(CONFIG_MODULE_SIG), y)
1013PHONY += modules_sign
1014modules_sign:
1015        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1016endif
1017
1018else # CONFIG_MODULES
1019
1020# Modules not configured
1021# ---------------------------------------------------------------------------
1022
1023modules modules_install: FORCE
1024        @echo >&2
1025        @echo >&2 "The present kernel configuration has modules disabled."
1026        @echo >&2 "Type 'make config' and enable loadable module support."
1027        @echo >&2 "Then build a kernel with module support enabled."
1028        @echo >&2
1029        @exit 1
1030
1031endif # CONFIG_MODULES
1032
1033###
1034# Cleaning is done on three levels.
1035# make clean     Delete most generated files
1036#                Leave enough to build external modules
1037# make mrproper  Delete the current configuration, and all generated files
1038# make distclean Remove editor backup files, patch leftover files and the like
1039
1040# Directories & files removed with 'make clean'
1041CLEAN_DIRS  += $(MODVERDIR)
1042
1043# Directories & files removed with 'make mrproper'
1044MRPROPER_DIRS  += include/config usr/include include/generated          \
1045                  arch/*/include/generated
1046MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1047                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1048                  signing_key.priv signing_key.x509 x509.genkey         \
1049                  extra_certificates signing_key.x509.keyid             \
1050                  signing_key.x509.signer
1051
1052# clean - Delete most, but leave enough to build external modules
1053#
1054clean: rm-dirs  := $(CLEAN_DIRS)
1055clean: rm-files := $(CLEAN_FILES)
1056clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1057
1058PHONY += $(clean-dirs) clean archclean vmlinuxclean
1059$(clean-dirs):
1060        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1061
1062vmlinuxclean:
1063        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1064
1065clean: archclean vmlinuxclean
1066
1067# mrproper - Delete all generated files, including .config
1068#
1069mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1070mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1071mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1072
1073PHONY += $(mrproper-dirs) mrproper archmrproper
1074$(mrproper-dirs):
1075        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1076
1077mrproper: clean archmrproper $(mrproper-dirs)
1078        $(call cmd,rmdirs)
1079        $(call cmd,rmfiles)
1080
1081# distclean
1082#
1083PHONY += distclean
1084
1085distclean: mrproper
1086        @find $(srctree) $(RCS_FIND_IGNORE) \
1087                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1088                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1089                -o -name '.*.rej' \
1090                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1091                -type f -print | xargs rm -f
1092
1093
1094# Packaging of the kernel to various formats
1095# ---------------------------------------------------------------------------
1096# rpm target kept for backward compatibility
1097package-dir     := $(srctree)/scripts/package
1098
1099%src-pkg: FORCE
1100        $(Q)$(MAKE) $(build)=$(package-dir) $@
1101%pkg: include/config/kernel.release FORCE
1102        $(Q)$(MAKE) $(build)=$(package-dir) $@
1103rpm: include/config/kernel.release FORCE
1104        $(Q)$(MAKE) $(build)=$(package-dir) $@
1105
1106
1107# Brief documentation of the typical targets used
1108# ---------------------------------------------------------------------------
1109
1110boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1111boards := $(notdir $(boards))
1112board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1113board-dirs := $(sort $(notdir $(board-dirs:/=)))
1114
1115help:
1116        @echo  'Cleaning targets:'
1117        @echo  '  clean           - Remove most generated files but keep the config and'
1118        @echo  '                    enough build support to build external modules'
1119        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1120        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1121        @echo  ''
1122        @echo  'Configuration targets:'
1123        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1124        @echo  ''
1125        @echo  'Other generic targets:'
1126        @echo  '  all             - Build all targets marked with [*]'
1127        @echo  '* vmlinux         - Build the bare kernel'
1128        @echo  '* modules         - Build all modules'
1129        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1130        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1131        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1132        @echo  '  dir/            - Build all files in dir and below'
1133        @echo  '  dir/file.[oisS] - Build specified target only'
1134        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1135        @echo  '                    (requires a recent binutils and recent build (System.map))'
1136        @echo  '  dir/file.ko     - Build module including final link'
1137        @echo  '  modules_prepare - Set up for building external modules'
1138        @echo  '  tags/TAGS       - Generate tags file for editors'
1139        @echo  '  cscope          - Generate cscope index'
1140        @echo  '  gtags           - Generate GNU GLOBAL index'
1141        @echo  '  kernelrelease   - Output the release version string'
1142        @echo  '  kernelversion   - Output the version stored in Makefile'
1143        @echo  '  image_name      - Output the image name'
1144        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1145         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1146         echo  ''
1147        @echo  'Static analysers'
1148        @echo  '  checkstack      - Generate a list of stack hogs'
1149        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1150        @echo  '  versioncheck    - Sanity check on version.h usage'
1151        @echo  '  includecheck    - Check for duplicate included header files'
1152        @echo  '  export_report   - List the usages of all exported symbols'
1153        @echo  '  headers_check   - Sanity check on exported headers'
1154        @echo  '  headerdep       - Detect inclusion cycles in headers'
1155        @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1156        @echo  ''
1157        @echo  'Kernel packaging:'
1158        @$(MAKE) $(build)=$(package-dir) help
1159        @echo  ''
1160        @echo  'Documentation targets:'
1161        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1162        @echo  ''
1163        @echo  'Architecture specific targets ($(SRCARCH)):'
1164        @$(if $(archhelp),$(archhelp),\
1165                echo '  No architecture specific help defined for $(SRCARCH)')
1166        @echo  ''
1167        @$(if $(boards), \
1168                $(foreach b, $(boards), \
1169                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1170                echo '')
1171        @$(if $(board-dirs), \
1172                $(foreach b, $(board-dirs), \
1173                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1174                printf "  %-16s - Show all of the above\\n" help-boards; \
1175                echo '')
1176
1177        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1178        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1179        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1180        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1181        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1182        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1183        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1184        @echo  '                1: warnings which may be relevant and do not occur too often'
1185        @echo  '                2: warnings which occur quite often but may still be relevant'
1186        @echo  '                3: more obscure warnings, can most likely be ignored'
1187        @echo  '                Multiple levels can be combined with W=12 or W=123'
1188        @echo  ''
1189        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1190        @echo  'For further info see the ./README file'
1191
1192
1193help-board-dirs := $(addprefix help-,$(board-dirs))
1194
1195help-boards: $(help-board-dirs)
1196
1197boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1198
1199$(help-board-dirs): help-%:
1200        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1201        @$(if $(boards-per-dir), \
1202                $(foreach b, $(boards-per-dir), \
1203                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1204                echo '')
1205
1206
1207# Documentation targets
1208# ---------------------------------------------------------------------------
1209%docs: scripts_basic FORCE
1210        $(Q)$(MAKE) $(build)=scripts build_docproc
1211        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1212
1213else # KBUILD_EXTMOD
1214
1215###
1216# External module support.
1217# When building external modules the kernel used as basis is considered
1218# read-only, and no consistency checks are made and the make
1219# system is not used on the basis kernel. If updates are required
1220# in the basis kernel ordinary make commands (without M=...) must
1221# be used.
1222#
1223# The following are the only valid targets when building external
1224# modules.
1225# make M=dir clean     Delete all automatically generated files
1226# make M=dir modules   Make all modules in specified dir
1227# make M=dir           Same as 'make M=dir modules'
1228# make M=dir modules_install
1229#                      Install the modules built in the module directory
1230#                      Assumes install directory is already created
1231
1232# We are always building modules
1233KBUILD_MODULES := 1
1234PHONY += crmodverdir
1235crmodverdir:
1236        $(cmd_crmodverdir)
1237
1238PHONY += $(objtree)/Module.symvers
1239$(objtree)/Module.symvers:
1240        @test -e $(objtree)/Module.symvers || ( \
1241        echo; \
1242        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1243        echo "           is missing; modules will have no dependencies and modversions."; \
1244        echo )
1245
1246module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1247PHONY += $(module-dirs) modules
1248$(module-dirs): crmodverdir $(objtree)/Module.symvers
1249        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1250
1251modules: $(module-dirs)
1252        @$(kecho) '  Building modules, stage 2.';
1253        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1254
1255PHONY += modules_install
1256modules_install: _emodinst_ _emodinst_post
1257
1258install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1259PHONY += _emodinst_
1260_emodinst_:
1261        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1262        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1263
1264PHONY += _emodinst_post
1265_emodinst_post: _emodinst_
1266        $(call cmd,depmod)
1267
1268clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1269
1270PHONY += $(clean-dirs) clean
1271$(clean-dirs):
1272        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1273
1274clean:  rm-dirs := $(MODVERDIR)
1275clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1276
1277help:
1278        @echo  '  Building external modules.'
1279        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1280        @echo  ''
1281        @echo  '  modules         - default target, build the module(s)'
1282        @echo  '  modules_install - install the module'
1283        @echo  '  clean           - remove generated files in module directory only'
1284        @echo  ''
1285
1286# Dummies...
1287PHONY += prepare scripts
1288prepare: ;
1289scripts: ;
1290endif # KBUILD_EXTMOD
1291
1292clean: $(clean-dirs)
1293        $(call cmd,rmdirs)
1294        $(call cmd,rmfiles)
1295        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1296                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1297                -o -name '*.ko.*' \
1298                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1299                -o -name '*.symtypes' -o -name 'modules.order' \
1300                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1301                -o -name '*.gcno' \) -type f -print | xargs rm -f
1302
1303# Generate tags for editors
1304# ---------------------------------------------------------------------------
1305quiet_cmd_tags = GEN     $@
1306      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1307
1308tags TAGS cscope gtags: FORCE
1309        $(call cmd,tags)
1310
1311# Scripts to check various things for consistency
1312# ---------------------------------------------------------------------------
1313
1314PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1315
1316includecheck:
1317        find $(srctree)/* $(RCS_FIND_IGNORE) \
1318                -name '*.[hcS]' -type f -print | sort \
1319                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1320
1321versioncheck:
1322        find $(srctree)/* $(RCS_FIND_IGNORE) \
1323                -name '*.[hcS]' -type f -print | sort \
1324                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1325
1326coccicheck:
1327        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1328
1329namespacecheck:
1330        $(PERL) $(srctree)/scripts/namespace.pl
1331
1332export_report:
1333        $(PERL) $(srctree)/scripts/export_report.pl
1334
1335endif #ifeq ($(config-targets),1)
1336endif #ifeq ($(mixed-targets),1)
1337
1338PHONY += checkstack kernelrelease kernelversion image_name
1339
1340# UML needs a little special treatment here.  It wants to use the host
1341# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1342# else wants $(ARCH), including people doing cross-builds, which means
1343# that $(SUBARCH) doesn't work here.
1344ifeq ($(ARCH), um)
1345CHECKSTACK_ARCH := $(SUBARCH)
1346else
1347CHECKSTACK_ARCH := $(ARCH)
1348endif
1349checkstack:
1350        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1351        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1352
1353kernelrelease:
1354        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1355
1356kernelversion:
1357        @echo $(KERNELVERSION)
1358
1359image_name:
1360        @echo $(KBUILD_IMAGE)
1361
1362# Clear a bunch of variables before executing the submake
1363tools/: FORCE
1364        $(Q)mkdir -p $(objtree)/tools
1365        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1366
1367tools/%: FORCE
1368        $(Q)mkdir -p $(objtree)/tools
1369        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1370
1371# Single targets
1372# ---------------------------------------------------------------------------
1373# Single targets are compatible with:
1374# - build with mixed source and output
1375# - build with separate output dir 'make O=...'
1376# - external modules
1377#
1378#  target-dir => where to store outputfile
1379#  build-dir  => directory in kernel source tree to use
1380
1381ifeq ($(KBUILD_EXTMOD),)
1382        build-dir  = $(patsubst %/,%,$(dir $@))
1383        target-dir = $(dir $@)
1384else
1385        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1386        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1387        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1388endif
1389
1390%.s: %.c prepare scripts FORCE
1391        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1392%.i: %.c prepare scripts FORCE
1393        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1394%.o: %.c prepare scripts FORCE
1395        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1396%.lst: %.c prepare scripts FORCE
1397        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1398%.s: %.S prepare scripts FORCE
1399        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1400%.o: %.S prepare scripts FORCE
1401        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1402%.symtypes: %.c prepare scripts FORCE
1403        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1404
1405# Modules
1406/: prepare scripts FORCE
1407        $(cmd_crmodverdir)
1408        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1409        $(build)=$(build-dir)
1410%/: prepare scripts FORCE
1411        $(cmd_crmodverdir)
1412        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1413        $(build)=$(build-dir)
1414%.ko: prepare scripts FORCE
1415        $(cmd_crmodverdir)
1416        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1417        $(build)=$(build-dir) $(@:.ko=.o)
1418        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1419
1420# FIXME Should go into a make.lib or something 
1421# ===========================================================================
1422
1423quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1424      cmd_rmdirs = rm -rf $(rm-dirs)
1425
1426quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1427      cmd_rmfiles = rm -f $(rm-files)
1428
1429# Run depmod only if we have System.map and depmod is executable
1430quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1431      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1432                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1433
1434# Create temporary dir for module support files
1435# clean it up only when building all modules
1436cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1437                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1438
1439# read all saved command lines
1440
1441targets := $(wildcard $(sort $(targets)))
1442cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1443
1444ifneq ($(cmd_files),)
1445  $(cmd_files): ;       # Do not try to update included dependency files
1446  include $(cmd_files)
1447endif
1448
1449# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1450# Usage:
1451# $(Q)$(MAKE) $(clean)=dir
1452clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1453
1454endif   # skip-makefile
1455
1456PHONY += FORCE
1457FORCE:
1458
1459# Declare the contents of the .PHONY variable as phony.  We keep that
1460# information in a variable so we can use it in if_changed and friends.
1461.PHONY: $(PHONY)
1462
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.