Makefile 49.2 KB
Newer Older
L
Linus Torvalds 已提交
1 2
VERSION = 2
PATCHLEVEL = 6
L
Linus Torvalds 已提交
3
SUBLEVEL = 21
L
Linus Torvalds 已提交
4
EXTRAVERSION =
L
Linus Torvalds 已提交
5
NAME = Nocturnal Monster Puppy
L
Linus Torvalds 已提交
6 7 8 9 10 11 12

# *DOCUMENTATION*
# To see a list of typical targets execute "make help"
# More info can be located in ./README
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.

13 14 15 16 17
# Do not:
# o  use make's built-in rules and variables
#    (this increases performance and avoid hard-to-debug behavour);
# o  print "Entering directory ...";
MAKEFLAGS += -rR --no-print-directory
L
Linus Torvalds 已提交
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

# We are using a recursive build, so we need to do a little thinking
# to get the ordering right.
#
# Most importantly: sub-Makefiles should only ever modify files in
# their own directory. If in some directory we have a dependency on
# a file in another dir (which doesn't happen often, but it's often
# unavoidable when linking the built-in.o targets which finally
# turn into vmlinux), we will call a sub make in that other dir, and
# after that we are sure that everything which is in that other dir
# is now up to date.
#
# The only cases where we need to modify files which have global
# effects are thus separated out and done before the recursive
# descending is started. They are now explicitly listed as the
# prepare rule.

# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands

ifdef V
  ifeq ("$(origin V)", "command line")
    KBUILD_VERBOSE = $(V)
  endif
endif
ifndef KBUILD_VERBOSE
  KBUILD_VERBOSE = 0
endif

47 48 49 50 51 52 53 54 55
# Call a source code checker (by default, "sparse") as part of the
# C compilation.
#
# Use 'make C=1' to enable checking of only re-compiled files.
# Use 'make C=2' to enable checking of *all* source files, regardless
# of whether they are re-compiled or not.
#
# See the file "Documentation/sparse.txt" for more details, including
# where to get the "sparse" utility.
L
Linus Torvalds 已提交
56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83

ifdef C
  ifeq ("$(origin C)", "command line")
    KBUILD_CHECKSRC = $(C)
  endif
endif
ifndef KBUILD_CHECKSRC
  KBUILD_CHECKSRC = 0
endif

# Use make M=dir to specify directory of external module to build
# Old syntax make ... SUBDIRS=$PWD is still supported
# Setting the environment variable KBUILD_EXTMOD take precedence
ifdef SUBDIRS
  KBUILD_EXTMOD ?= $(SUBDIRS)
endif
ifdef M
  ifeq ("$(origin M)", "command line")
    KBUILD_EXTMOD := $(M)
  endif
endif


# kbuild supports saving output files in a separate directory.
# To locate output files in a separate directory two syntaxes are supported.
# In both cases the working directory must be the root of the kernel src.
# 1) O=
# Use "make O=dir/to/store/output/files/"
S
Sam Ravnborg 已提交
84
#
L
Linus Torvalds 已提交
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107
# 2) Set KBUILD_OUTPUT
# Set the environment variable KBUILD_OUTPUT to point to the directory
# where the output files shall be placed.
# export KBUILD_OUTPUT=dir/to/store/output/files/
# make
#
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.


# KBUILD_SRC is set on invocation of make in OBJ directory
# KBUILD_SRC is not intended to be used by the regular user (for now)
ifeq ($(KBUILD_SRC),)

# OK, Make called in directory where kernel src resides
# Do we want to locate output files in a separate directory?
ifdef O
  ifeq ("$(origin O)", "command line")
    KBUILD_OUTPUT := $(O)
  endif
endif

# That's our default target when none is given on the command line
108
PHONY := _all
L
Linus Torvalds 已提交
109 110 111 112 113 114 115 116 117 118
_all:

ifneq ($(KBUILD_OUTPUT),)
# Invoke a second make in the output directory, passing relevant variables
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
$(if $(KBUILD_OUTPUT),, \
     $(error output directory "$(saved-output)" does not exist))

119
PHONY += $(MAKECMDGOALS)
L
Linus Torvalds 已提交
120

121
$(filter-out _all,$(MAKECMDGOALS)) _all:
122 123
	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
	KBUILD_SRC=$(CURDIR) \
124
	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
L
Linus Torvalds 已提交
125 126 127 128 129 130 131 132 133 134 135

# Leave processing to above invocation of make
skip-makefile := 1
endif # ifneq ($(KBUILD_OUTPUT),)
endif # ifeq ($(KBUILD_SRC),)

# We process the rest of the Makefile if this is the final invocation of make
ifeq ($(skip-makefile),)

# If building an external module we do not care about the all: rule
# but instead _all depend on modules
136
PHONY += all
L
Linus Torvalds 已提交
137 138 139 140 141 142 143 144 145 146 147 148 149
ifeq ($(KBUILD_EXTMOD),)
_all: all
else
_all: modules
endif

srctree		:= $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
TOPDIR		:= $(srctree)
# FIXME - TOPDIR is obsolete, use srctree/objtree
objtree		:= $(CURDIR)
src		:= $(srctree)
obj		:= $(objtree)

150
VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
L
Linus Torvalds 已提交
151 152 153 154 155 156 157 158 159 160 161 162

export srctree objtree VPATH TOPDIR


# SUBARCH tells the usermode build what the underlying arch is.  That is set
# first, and if a usermode build is happening, the "ARCH=um" on the command
# line overrides the setting of ARCH below.  If a native build is happening,
# then ARCH is assigned, getting whatever value it gets normally, and 
# SUBARCH is subsequently ignored.

SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
				  -e s/arm.*/arm/ -e s/sa110/arm/ \
163
				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
164
				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
L
Linus Torvalds 已提交
165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190

# Cross compiling and selecting different set of gcc/bin-utils
# ---------------------------------------------------------------------------
#
# When performing cross compilation for other architectures ARCH shall be set
# to the target architecture. (See arch/* for the possibilities).
# ARCH can be set during invocation of make:
# make ARCH=ia64
# Another way is to have ARCH set in the environment.
# The default ARCH is the host where make is executed.

# CROSS_COMPILE specify the prefix used for all executables used
# during compilation. Only gcc and related bin-utils executables
# are prefixed with $(CROSS_COMPILE).
# CROSS_COMPILE can be set on the command line
# make CROSS_COMPILE=ia64-linux-
# Alternatively CROSS_COMPILE can be set in the environment.
# Default value for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile

ARCH		?= $(SUBARCH)
CROSS_COMPILE	?=

# Architecture as present in compile.h
UTS_MACHINE := $(ARCH)

R
Roman Zippel 已提交
191 192
KCONFIG_CONFIG	?= .config

L
Linus Torvalds 已提交
193 194 195 196 197
# SHELL used by kbuild
CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
	  else if [ -x /bin/bash ]; then echo /bin/bash; \
	  else echo sh; fi ; fi)

S
Sam Ravnborg 已提交
198 199 200 201
HOSTCC       = gcc
HOSTCXX      = g++
HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
HOSTCXXFLAGS = -O2
L
Linus Torvalds 已提交
202

S
Sam Ravnborg 已提交
203 204
# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.
L
Linus Torvalds 已提交
205 206 207 208 209 210 211

KBUILD_MODULES :=
KBUILD_BUILTIN := 1

#	If we have only "make modules", don't compile built-in objects.
#	When we're building modules with modversions, we need to consider
#	the built-in objects during the descend as well, in order to
S
Sam Ravnborg 已提交
212
#	make sure the checksums are up to date before we record them.
L
Linus Torvalds 已提交
213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229

ifeq ($(MAKECMDGOALS),modules)
  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
endif

#	If we have "make <whatever> modules", compile modules
#	in addition to whatever we do anyway.
#	Just "make" or "make all" shall build modules as well

ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
  KBUILD_MODULES := 1
endif

ifeq ($(MAKECMDGOALS),)
  KBUILD_MODULES := 1
endif

230
export KBUILD_MODULES KBUILD_BUILTIN
L
Linus Torvalds 已提交
231 232 233 234 235 236 237 238 239 240 241 242 243 244
export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD

# Beautify output
# ---------------------------------------------------------------------------
#
# Normally, we echo the whole command before executing it. By making
# that echo $($(quiet)$(cmd)), we now have the possibility to set
# $(quiet) to choose other forms of output instead, e.g.
#
#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
#
# If $(quiet) is empty, the whole command will be printed.
# If it is set to "quiet_", only the short version will be printed. 
S
Sam Ravnborg 已提交
245
# If it is set to "silent_", nothing will be printed at all, since
L
Linus Torvalds 已提交
246 247
# the variable $(silent_cmd_cc_o_c) doesn't exist.
#
A
Adrian Bunk 已提交
248
# A simple variant is to prefix commands with $(Q) - that's useful
L
Linus Torvalds 已提交
249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276
# for commands that shall be hidden in non-verbose mode.
#
#	$(Q)ln $@ :<
#
# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
# If KBUILD_VERBOSE equals 1 then the above command is displayed.

ifeq ($(KBUILD_VERBOSE),1)
  quiet =
  Q =
else
  quiet=quiet_
  Q = @
endif

# If the user is running make -s (silent mode), suppress echoing of
# commands

ifneq ($(findstring s,$(MAKEFLAGS)),)
  quiet=silent_
endif

export quiet Q KBUILD_VERBOSE


# Look for make include files relative to root of kernel src
MAKEFLAGS += --include-dir=$(srctree)

277 278
# We need some generic definitions.
include $(srctree)/scripts/Kbuild.include
L
Linus Torvalds 已提交
279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297

# Make variables (CC, etc...)

AS		= $(CROSS_COMPILE)as
LD		= $(CROSS_COMPILE)ld
CC		= $(CROSS_COMPILE)gcc
CPP		= $(CC) -E
AR		= $(CROSS_COMPILE)ar
NM		= $(CROSS_COMPILE)nm
STRIP		= $(CROSS_COMPILE)strip
OBJCOPY		= $(CROSS_COMPILE)objcopy
OBJDUMP		= $(CROSS_COMPILE)objdump
AWK		= awk
GENKSYMS	= scripts/genksyms/genksyms
DEPMOD		= /sbin/depmod
KALLSYMS	= scripts/kallsyms
PERL		= perl
CHECK		= sparse

A
Al Viro 已提交
298
CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
L
Linus Torvalds 已提交
299 300 301 302 303 304 305 306 307 308 309
MODFLAGS	= -DMODULE
CFLAGS_MODULE   = $(MODFLAGS)
AFLAGS_MODULE   = $(MODFLAGS)
LDFLAGS_MODULE  = -r
CFLAGS_KERNEL	=
AFLAGS_KERNEL	=


# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
LINUXINCLUDE    := -Iinclude \
310
                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
311
		   -include include/linux/autoconf.h
L
Linus Torvalds 已提交
312 313 314

CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)

S
Sam Ravnborg 已提交
315 316 317
CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
                   -fno-strict-aliasing -fno-common
AFLAGS          := -D__ASSEMBLY__
L
Linus Torvalds 已提交
318

R
Roman Zippel 已提交
319 320
# Read KERNELRELEASE from include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
321
KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
322

S
Sam Ravnborg 已提交
323 324 325 326
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
export ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
L
Linus Torvalds 已提交
327 328

export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
S
Sam Ravnborg 已提交
329
export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
L
Linus Torvalds 已提交
330 331 332 333 334 335 336 337 338
export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE

# When compiling out-of-tree modules, put MODVERDIR in the module
# tree rather than in the kernel tree. The kernel tree might
# even be read-only.
export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions

# Files to ignore in find ... statements

339 340
RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
L
Linus Torvalds 已提交
341 342 343 344 345

# ===========================================================================
# Rules shared between *config targets and build targets

# Basic helpers built in scripts/
346
PHONY += scripts_basic
L
Linus Torvalds 已提交
347 348 349
scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic

350 351 352
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

353
PHONY += outputmakefile
354 355 356
# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
L
Linus Torvalds 已提交
357
outputmakefile:
358 359 360 361
ifneq ($(KBUILD_SRC),)
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif
L
Linus Torvalds 已提交
362 363 364 365 366

# To make sure we do not include .config for any of the *config targets
# catch them early, and hand them over to scripts/kconfig/Makefile
# It is allowed to specify more targets when calling make, including
# mixing *config targets and build targets.
S
Sam Ravnborg 已提交
367
# For example 'make oldconfig all'.
L
Linus Torvalds 已提交
368 369 370
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

371
no-dot-config-targets := clean mrproper distclean \
372
			 cscope TAGS tags help %docs check% \
373 374
			 include/linux/version.h headers_% \
			 kernelrelease kernelversion
L
Linus Torvalds 已提交
375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414

config-targets := 0
mixed-targets  := 0
dot-config     := 1

ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
		dot-config := 0
	endif
endif

ifeq ($(KBUILD_EXTMOD),)
        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
                config-targets := 1
                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
                        mixed-targets := 1
                endif
        endif
endif

ifeq ($(mixed-targets),1)
# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.

%:: FORCE
	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@

else
ifeq ($(config-targets),1)
# ===========================================================================
# *config targets only - make sure prerequisites are updated, and descend
# in scripts/kconfig to make the *config target

# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
# KBUILD_DEFCONFIG may point out an alternative default configuration
# used for 'make defconfig'
include $(srctree)/arch/$(ARCH)/Makefile
export KBUILD_DEFCONFIG

415
config %config: scripts_basic outputmakefile FORCE
R
Roman Zippel 已提交
416
	$(Q)mkdir -p include/linux include/config
L
Linus Torvalds 已提交
417 418 419 420 421 422 423 424 425 426
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

else
# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.

ifeq ($(KBUILD_EXTMOD),)
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
S
Sam Ravnborg 已提交
427
# in parallel
428
PHONY += scripts
429
scripts: scripts_basic include/config/auto.conf
L
Linus Torvalds 已提交
430 431 432 433 434 435 436 437 438 439 440
	$(Q)$(MAKE) $(build)=$(@)

# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
drivers-y	:= drivers/ sound/
net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
441 442
# Read in config
-include include/config/auto.conf
L
Linus Torvalds 已提交
443

444
ifeq ($(KBUILD_EXTMOD),)
L
Linus Torvalds 已提交
445 446
# Read in dependencies to all Kconfig* files, make sure to run
# oldconfig if changes are detected.
R
Roman Zippel 已提交
447
-include include/config/auto.conf.cmd
L
Linus Torvalds 已提交
448 449

# To avoid any implicit rule to kick in, define an empty command
R
Roman Zippel 已提交
450
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
L
Linus Torvalds 已提交
451

R
Roman Zippel 已提交
452
# If .config is newer than include/config/auto.conf, someone tinkered
453
# with it and forgot to run make oldconfig.
S
Sam Ravnborg 已提交
454
# if auto.conf.cmd is missing then we are probably in a cleaned tree so
455
# we execute the config step to be sure to catch updated Kconfig files
R
Roman Zippel 已提交
456
include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
L
Linus Torvalds 已提交
457
	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
458
else
459 460 461 462 463 464 465 466 467 468 469 470 471 472
# external modules needs include/linux/autoconf.h and include/config/auto.conf
# but do not care if they are up-to-date. Use auto.conf to trigger the test
PHONY += include/config/auto.conf

include/config/auto.conf:
	$(Q)test -e include/linux/autoconf.h -a -e $@ || (		\
	echo;								\
	echo "  ERROR: Kernel configuration is invalid.";		\
	echo "         include/linux/autoconf.h or $@ are missing.";	\
	echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
	echo;								\
	/bin/false)

endif # KBUILD_EXTMOD
R
Roman Zippel 已提交
473

L
Linus Torvalds 已提交
474 475
else
# Dummy target needed, because used as prerequisite
R
Roman Zippel 已提交
476
include/config/auto.conf: ;
477
endif # $(dot-config)
L
Linus Torvalds 已提交
478 479 480 481

# The all: target is the default when no target is given on the
# command line.
# This allow a user to issue only 'make' to build a kernel including modules
S
Sam Ravnborg 已提交
482
# Defaults vmlinux but it is usually overridden in the arch makefile
L
Linus Torvalds 已提交
483 484 485 486 487 488 489 490
all: vmlinux

ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
CFLAGS		+= -Os
else
CFLAGS		+= -O2
endif

491 492
include $(srctree)/arch/$(ARCH)/Makefile

L
Linus Torvalds 已提交
493
ifdef CONFIG_FRAME_POINTER
494
CFLAGS		+= -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
L
Linus Torvalds 已提交
495 496 497 498 499 500 501 502
else
CFLAGS		+= -fomit-frame-pointer
endif

ifdef CONFIG_DEBUG_INFO
CFLAGS		+= -g
endif

503 504
# Force gcc to behave correct even for buggy distributions
CFLAGS          += $(call cc-option, -fno-stack-protector)
L
Linus Torvalds 已提交
505

506
# arch Makefile may override CC so keep this after arch Makefile is included
507
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
508 509
CHECKFLAGS     += $(NOSTDINC_FLAGS)

L
Linus Torvalds 已提交
510 511 512
# warn about C99 declaration after statement
CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)

S
Sam Ravnborg 已提交
513
# disable pointer signed / unsigned warnings in gcc 4.0
L
Linus Torvalds 已提交
514 515 516
CFLAGS += $(call cc-option,-Wno-pointer-sign,)

# Default kernel image to build when no specific target is given.
S
Sam Ravnborg 已提交
517
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
518 519 520 521 522 523 524 525 526 527 528 529 530
# set in the environment
# Also any assignments in arch/$(ARCH)/Makefile take precedence over
# this default value
export KBUILD_IMAGE ?= vmlinux

#
# INSTALL_PATH specifies where to place the updated kernel and system map
# images. Default is /boot, but you can set it to other values
export	INSTALL_PATH ?= /boot

#
# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
# relocations required by build roots.  This is not defined in the
S
Sam Ravnborg 已提交
531
# makefile but the argument can be passed to make if needed.
L
Linus Torvalds 已提交
532 533
#

534
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
Linus Torvalds 已提交
535 536
export MODLIB

537 538 539 540 541 542 543 544
#
#  INSTALL_MOD_STRIP, if defined, will cause modules to be
#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
#  the default option --strip-debug will be used.  Otherwise,
#  INSTALL_MOD_STRIP will used as the options to the strip command.

ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
A
Andreas Schwab 已提交
545
mod_strip_cmd = $(STRIP) --strip-debug
546 547 548 549 550 551 552 553
else
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
endif # INSTALL_MOD_STRIP=1
else
mod_strip_cmd = true
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

L
Linus Torvalds 已提交
554 555

ifeq ($(KBUILD_EXTMOD),)
556
core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
L
Linus Torvalds 已提交
557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
		     $(net-y) $(net-m) $(libs-y) $(libs-m)))

vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
		     $(init-n) $(init-) \
		     $(core-n) $(core-) $(drivers-n) $(drivers-) \
		     $(net-n)  $(net-)  $(libs-n)    $(libs-))))

init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
libs-y		:= $(libs-y1) $(libs-y2)

# Build vmlinux
# ---------------------------------------------------------------------------
S
Sam Ravnborg 已提交
577
# vmlinux is built from the objects selected by $(vmlinux-init) and
L
Linus Torvalds 已提交
578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605
# $(vmlinux-main). Most are built-in.o files from top-level directories
# in the kernel tree, others are specified in arch/$(ARCH)Makefile.
# Ordering when linking is important, and $(vmlinux-init) must be first.
#
# vmlinux
#   ^
#   |
#   +-< $(vmlinux-init)
#   |   +--< init/version.o + more
#   |
#   +--< $(vmlinux-main)
#   |    +--< driver/built-in.o mm/built-in.o + more
#   |
#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
#
# vmlinux version (uname -v) cannot be updated during normal
# descending-into-subdirs phase since we do not yet know if we need to
# update vmlinux.
# Therefore this step is delayed until just before final link of vmlinux -
# except in the kallsyms case where it is done just before adding the
# symbols to the kernel.
#
# System.map is generated to document addresses of all kernel symbols

vmlinux-init := $(head-y) $(init-y)
vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
606
export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
L
Linus Torvalds 已提交
607 608 609 610 611 612 613 614 615 616 617 618

# Rule to link vmlinux - also used during CONFIG_KALLSYMS
# May be overridden by arch/$(ARCH)/Makefile
quiet_cmd_vmlinux__ ?= LD      $@
      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
      -T $(vmlinux-lds) $(vmlinux-init)                          \
      --start-group $(vmlinux-main) --end-group                  \
      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)

# Generate new vmlinux version
quiet_cmd_vmlinux_version = GEN     .version
      cmd_vmlinux_version = set -e;                     \
619 620 621 622 623 624 625
	if [ ! -r .version ]; then			\
	  rm -f .version;				\
	  echo 1 >.version;				\
	else						\
	  mv .version .old_version;			\
	  expr 0$$(cat .old_version) + 1 >.version;	\
	fi;						\
L
Linus Torvalds 已提交
626 627 628
	$(MAKE) $(build)=init

# Generate System.map
S
Sam Ravnborg 已提交
629
quiet_cmd_sysmap = SYSMAP
L
Linus Torvalds 已提交
630 631 632 633 634
      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap

# Link of vmlinux
# If CONFIG_KALLSYMS is set .version is already updated
# Generate System.map and verify that the content is consistent
635 636
# Use + in front of the vmlinux_version rule to silent warning with make -j2
# First command is ':' to allow us to use + in front of the rule
L
Linus Torvalds 已提交
637
define rule_vmlinux__
638
	:
L
Linus Torvalds 已提交
639 640 641 642 643
	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))

	$(call cmd,vmlinux__)
	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd

644 645 646 647 648 649
	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
	  echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
	$(cmd_sysmap) $@ System.map;                                         \
	if [ $$? -ne 0 ]; then                                               \
		rm -f $@;                                                    \
		/bin/false;                                                  \
L
Linus Torvalds 已提交
650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681
	fi;
	$(verify_kallsyms)
endef


ifdef CONFIG_KALLSYMS
# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
# It's a three stage process:
# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
#   empty
#   Running kallsyms on that gives us .tmp_kallsyms1.o with
#   the right size - vmlinux version (uname -v) is updated during this step
# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
#   but due to the added section, some addresses have shifted.
#   From here, we generate a correct .tmp_kallsyms2.o
# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
# o Verify that the System.map from vmlinux matches the map from
#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
#   temporary bypass to allow the kernel to be built while the
#   maintainers work out what went wrong with kallsyms.

ifdef CONFIG_KALLSYMS_EXTRA_PASS
last_kallsyms := 3
else
last_kallsyms := 2
endif

kallsyms.o := .tmp_kallsyms$(last_kallsyms).o

define verify_kallsyms
682 683
	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
	  echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
L
Linus Torvalds 已提交
684
	  $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
685 686 687
	$(Q)cmp -s System.map .tmp_System.map ||                             \
		(echo Inconsistent kallsyms data;                            \
		 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
L
Linus Torvalds 已提交
688 689 690 691 692
		 rm .tmp_kallsyms* ; /bin/false )
endef

# Update vmlinux version before link
# Use + in front of this rule to silent warning about make -j1
S
Sam Ravnborg 已提交
693
# First command is ':' to allow us to use + in front of this rule
L
Linus Torvalds 已提交
694 695
cmd_ksym_ld = $(cmd_vmlinux__)
define rule_ksym_ld
S
Sam Ravnborg 已提交
696
	: 
L
Linus Torvalds 已提交
697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
	+$(call cmd,vmlinux_version)
	$(call cmd,vmlinux__)
	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
endef

# Generate .S file with all kernel symbols
quiet_cmd_kallsyms = KSYM    $@
      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@

.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
	$(call if_changed_dep,as_o_S)

.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
	$(call cmd,kallsyms)

# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
	$(call if_changed_rule,ksym_ld)

.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
	$(call if_changed,vmlinux__)

.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
	$(call if_changed,vmlinux__)

# Needs to visit scripts/ before $(KALLSYMS) can be used.
$(KALLSYMS): scripts ;

S
Sam Ravnborg 已提交
726 727 728 729 730 731 732 733 734 735
# Generate some data for debugging strange kallsyms problems
debug_kallsyms: .tmp_map$(last_kallsyms)

.tmp_map%: .tmp_vmlinux% FORCE
	($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@

.tmp_map3: .tmp_map2

.tmp_map2: .tmp_map1

L
Linus Torvalds 已提交
736 737 738 739
endif # ifdef CONFIG_KALLSYMS

# vmlinux image - including updated kernel symbols
vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
740
ifdef CONFIG_HEADERS_CHECK
741
	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
742
endif
L
Linus Torvalds 已提交
743
	$(call if_changed_rule,vmlinux__)
744
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
745
	$(Q)rm -f .old_version
L
Linus Torvalds 已提交
746 747 748 749 750 751 752 753 754 755 756

# The actual objects are generated when descending, 
# make sure no implicit rule kicks in
$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;

# Handle descending into subdirectories listed in $(vmlinux-dirs)
# Preset locale variables to speed up the build process. Limit locale
# tweaks to this spot to avoid wrong language settings when running
# make menuconfig etc.
# Error messages still appears in the original language

757
PHONY += $(vmlinux-dirs)
758
$(vmlinux-dirs): prepare scripts
L
Linus Torvalds 已提交
759 760
	$(Q)$(MAKE) $(build)=$@

761 762
# Build the kernel release string
#
763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779
# The KERNELRELEASE value built here is stored in the file
# include/config/kernel.release, and is used when executing several
# make targets, such as "make install" or "make modules_install."
#
# The eventual kernel release string consists of the following fields,
# shown in a hierarchical format to show how smaller parts are concatenated
# to form the larger and final value, with values coming from places like
# the Makefile, kernel config options, make command line options and/or
# SCM tag information.
#
#	$(KERNELVERSION)
#	  $(VERSION)			eg, 2
#	  $(PATCHLEVEL)			eg, 6
#	  $(SUBLEVEL)			eg, 18
#	  $(EXTRAVERSION)		eg, -rc6
#	$(localver-full)
#	  $(localver)
780
#	    localversion*		(files without backups, containing '~')
781 782 783 784 785 786 787 788 789
#	    $(CONFIG_LOCALVERSION)	(from kernel config setting)
#	  $(localver-auto)		(only if CONFIG_LOCALVERSION_AUTO is set)
#	    ./scripts/setlocalversion	(SCM tag, if one exists)
#	    $(LOCALVERSION)		(from make command line if provided)
#
#  Note how the final $(localver-auto) string is included *only* if the
# kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
# moment, only git is supported but other SCMs can edit the script
# scripts/setlocalversion and add the appropriate checks as needed.
790

791 792
pattern = ".*/localversion[^~]*"
string  = $(shell cat /dev/null \
793
	   `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
794

795 796
localver = $(subst $(space),, $(string) \
			      $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
S
Sam Ravnborg 已提交
797

798 799
# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
# and if the SCM is know a tag from the SCM is appended.
S
Sam Ravnborg 已提交
800
# The appended tag is determined by the SCM used.
801 802 803 804 805 806 807 808 809 810 811 812
#
# Currently, only git is supported.
# Other SCMs can edit scripts/setlocalversion and add the appropriate
# checks as needed.
ifdef CONFIG_LOCALVERSION_AUTO
	_localver-auto = $(shell $(CONFIG_SHELL) \
	                  $(srctree)/scripts/setlocalversion $(srctree))
	localver-auto  = $(LOCALVERSION)$(_localver-auto)
endif

localver-full = $(localver)$(localver-auto)

R
Roman Zippel 已提交
813
# Store (new) KERNELRELASE string in include/config/kernel.release
814
kernelrelease = $(KERNELVERSION)$(localver-full)
R
Roman Zippel 已提交
815
include/config/kernel.release: include/config/auto.conf FORCE
816 817
	$(Q)rm -f $@
	$(Q)echo $(kernelrelease) > $@
818 819


L
Linus Torvalds 已提交
820
# Things we need to do before we recursively start building the kernel
821 822 823 824
# or the modules are listed in "prepare".
# A multi level approach is used. prepareN is processed before prepareN-1.
# archprepare is used in arch Makefiles and when processed asm symlink,
# version.h and scripts_basic is processed / created.
L
Linus Torvalds 已提交
825

826
# Listed in dependency order
827
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
828

829
# prepare3 is used to check if we are building in a separate output directory,
L
Linus Torvalds 已提交
830 831 832
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
# 2) Create the include2 directory, used for the second asm symlink
R
Roman Zippel 已提交
833
prepare3: include/config/kernel.release
L
Linus Torvalds 已提交
834 835
ifneq ($(KBUILD_SRC),)
	@echo '  Using $(srctree) as source for kernel'
R
Roman Zippel 已提交
836
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
L
Linus Torvalds 已提交
837 838 839 840 841 842 843 844
		echo "  $(srctree) is not clean, please run 'make mrproper'";\
		echo "  in the '$(srctree)' directory.";\
		/bin/false; \
	fi;
	$(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
	$(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
endif

845 846
# prepare2 creates a makefile if using a separate output directory
prepare2: prepare3 outputmakefile
L
Linus Torvalds 已提交
847

848 849
prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
                   include/asm include/config/auto.conf
L
Linus Torvalds 已提交
850 851
ifneq ($(KBUILD_MODULES),)
	$(Q)mkdir -p $(MODVERDIR)
852
	$(Q)rm -f $(MODVERDIR)/*
L
Linus Torvalds 已提交
853 854
endif

855 856 857
archprepare: prepare1 scripts_basic

prepare0: archprepare FORCE
858
	$(Q)$(MAKE) $(build)=.
859

L
Linus Torvalds 已提交
860
# All the preparing..
861
prepare: prepare0
L
Linus Torvalds 已提交
862

S
Sam Ravnborg 已提交
863 864
# Leave this as default for preprocessing vmlinux.lds.S, which is now
# done in arch/$(ARCH)/kernel/Makefile
L
Linus Torvalds 已提交
865 866 867

export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)

S
Sam Ravnborg 已提交
868 869 870
# FIXME: The asm symlink changes when $(ARCH) changes. That's
# hard to detect, but I suppose "make mrproper" is a good idea
# before switching between archs anyway.
L
Linus Torvalds 已提交
871 872 873 874 875 876 877 878 879 880 881 882 883

include/asm:
	@echo '  SYMLINK $@ -> include/asm-$(ARCH)'
	$(Q)if [ ! -d include ]; then mkdir -p include; fi;
	@ln -fsn asm-$(ARCH) $@

# Generate some files
# ---------------------------------------------------------------------------

# KERNELRELEASE can change from a few different places, meaning version.h
# needs to be updated, so this check is forced on all builds

uts_len := 64
S
Sam Ravnborg 已提交
884 885 886 887 888 889 890
define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
endef
L
Linus Torvalds 已提交
891 892

define filechk_version.h
S
Sam Ravnborg 已提交
893 894 895
	(echo \#define LINUX_VERSION_CODE $(shell                             \
	expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
L
Linus Torvalds 已提交
896 897
endef

S
Sam Ravnborg 已提交
898
include/linux/version.h: $(srctree)/Makefile FORCE
L
Linus Torvalds 已提交
899 900
	$(call filechk,version.h)

S
Sam Ravnborg 已提交
901 902 903
include/linux/utsrelease.h: include/config/kernel.release FORCE
	$(call filechk,utsrelease.h)

L
Linus Torvalds 已提交
904 905
# ---------------------------------------------------------------------------

906
PHONY += depend dep
L
Linus Torvalds 已提交
907 908 909
depend dep:
	@echo '*** Warning: make $@ is unnecessary now.'

910 911
# ---------------------------------------------------------------------------
# Kernel headers
912
INSTALL_HDR_PATH=$(objtree)/usr
913 914
export INSTALL_HDR_PATH

915 916 917
HDRARCHES=$(filter-out generic,$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))

PHONY += headers_install_all
918
headers_install_all: include/linux/version.h scripts_basic FORCE
919
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
920
	$(Q)for arch in $(HDRARCHES); do \
921
	 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
922 923
	 done

924
PHONY += headers_install
925
headers_install: include/linux/version.h scripts_basic FORCE
926
	@if [ ! -r $(srctree)/include/asm-$(ARCH)/Kbuild ]; then \
927 928
	  echo '*** Error: Headers not exportable for this architecture ($(ARCH))'; \
	  exit 1 ; fi
S
Sam Ravnborg 已提交
929
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
S
Sam Ravnborg 已提交
930
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst obj=include
931

932 933 934 935 936 937
PHONY += headers_check_all
headers_check_all: headers_install_all
	$(Q)for arch in $(HDRARCHES); do \
	 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
	 done

938 939
PHONY += headers_check
headers_check: headers_install
S
Sam Ravnborg 已提交
940
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst obj=include HDRCHECK=1
941

L
Linus Torvalds 已提交
942 943 944 945 946
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
Sam Ravnborg 已提交
947
# By default, build modules as well
L
Linus Torvalds 已提交
948 949 950 951 952

all: modules

#	Build modules

953
PHONY += modules
L
Linus Torvalds 已提交
954 955
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
	@echo '  Building modules, stage 2.';
S
Sam Ravnborg 已提交
956
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
Linus Torvalds 已提交
957 958 959


# Target to prepare building external modules
960
PHONY += modules_prepare
961
modules_prepare: prepare scripts
L
Linus Torvalds 已提交
962 963

# Target to install modules
964
PHONY += modules_install
L
Linus Torvalds 已提交
965 966
modules_install: _modinst_ _modinst_post

967
PHONY += _modinst_
L
Linus Torvalds 已提交
968
_modinst_:
969
	@if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
L
Linus Torvalds 已提交
970 971 972 973 974 975 976 977 978 979 980 981
		echo "Warning: you may need to install module-init-tools"; \
		echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
		sleep 1; \
	fi
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
	@ln -s $(srctree) $(MODLIB)/source
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
		ln -s $(objtree) $(MODLIB)/build ; \
	fi
S
Sam Ravnborg 已提交
982
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
983 984 985 986 987 988 989 990 991 992 993

# If System.map exists, run depmod.  This deliberately does not have a
# dependency on System.map since that would run the dependency tree on
# vmlinux.  This depmod is only for convenience to give the initial
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
ifeq "$(strip $(INSTALL_MOD_PATH))" ""
depmod_opts	:=
else
depmod_opts	:= -b $(INSTALL_MOD_PATH) -r
endif
994
PHONY += _modinst_post
L
Linus Torvalds 已提交
995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025
_modinst_post: _modinst_
	if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi

else # CONFIG_MODULES

# Modules not configured
# ---------------------------------------------------------------------------

modules modules_install: FORCE
	@echo
	@echo "The present kernel configuration has modules disabled."
	@echo "Type 'make config' and enable loadable module support."
	@echo "Then build a kernel with module support enabled."
	@echo
	@exit 1

endif # CONFIG_MODULES

###
# Cleaning is done on three levels.
# make clean     Delete most generated files
#                Leave enough to build external modules
# make mrproper  Delete the current configuration, and all generated files
# make distclean Remove editor backup files, patch leftover files and the like

# Directories & files removed with 'make clean'
CLEAN_DIRS  += $(MODVERDIR)
CLEAN_FILES +=	vmlinux System.map \
                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map

# Directories & files removed with 'make mrproper'
1026
MRPROPER_DIRS  += include/config include2 usr/include
1027
MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1028 1029
                  include/linux/autoconf.h include/linux/version.h      \
                  include/linux/utsrelease.h                            \
R
Roman Zippel 已提交
1030
		  Module.symvers tags TAGS cscope*
L
Linus Torvalds 已提交
1031 1032 1033 1034 1035

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1036
clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
L
Linus Torvalds 已提交
1037

1038
PHONY += $(clean-dirs) clean archclean
L
Linus Torvalds 已提交
1039 1040 1041 1042 1043 1044 1045
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean: archclean $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
	@find . $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1046
		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1047 1048
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
		-o -name '*.symtypes' \) \
L
Linus Torvalds 已提交
1049 1050 1051 1052 1053 1054 1055 1056
		-type f -print | xargs rm -f

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)

1057
PHONY += $(mrproper-dirs) mrproper archmrproper
L
Linus Torvalds 已提交
1058 1059 1060 1061 1062 1063 1064 1065 1066
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

mrproper: clean archmrproper $(mrproper-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)

# distclean
#
1067
PHONY += distclean
L
Linus Torvalds 已提交
1068 1069 1070

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1071
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
L
Linus Torvalds 已提交
1072
		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
S
Sam Ravnborg 已提交
1073
		-o -name '.*.rej' -o -size 0 \
L
Linus Torvalds 已提交
1074 1075 1076 1077 1078 1079 1080 1081 1082
		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------
# rpm target kept for backward compatibility
package-dir	:= $(srctree)/scripts/package

1083
%pkg: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1084
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1085
rpm: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1086
	$(Q)$(MAKE) $(build)=$(package-dir) $@
L
Linus Torvalds 已提交
1087 1088 1089 1090 1091 1092 1093 1094 1095 1096


# Brief documentation of the typical targets used
# ---------------------------------------------------------------------------

boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
boards := $(notdir $(boards))

help:
	@echo  'Cleaning targets:'
1097
	@echo  '  clean		  - Remove most generated files but keep the config and'
1098
	@echo  '                    enough build support to build external modules'
1099
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1100
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
Linus Torvalds 已提交
1101 1102 1103 1104 1105 1106 1107 1108
	@echo  ''
	@echo  'Configuration targets:'
	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
	@echo  ''
	@echo  'Other generic targets:'
	@echo  '  all		  - Build all targets marked with [*]'
	@echo  '* vmlinux	  - Build the bare kernel'
	@echo  '* modules	  - Build all modules'
1109
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1110 1111
	@echo  '  dir/            - Build all files in dir and below'
	@echo  '  dir/file.[ois]  - Build specified target only'
1112
	@echo  '  dir/file.ko     - Build module including final link'
L
Linus Torvalds 已提交
1113 1114 1115
	@echo  '  rpm		  - Build a kernel as an RPM package'
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1116
	@echo  '  kernelrelease	  - Output the release version string'
1117
	@echo  '  kernelversion	  - Output the version stored in Makefile'
1118
	@if [ -r $(srctree)/include/asm-$(ARCH)/Kbuild ]; then \
1119
	 echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1120
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1121
	 fi
L
Linus Torvalds 已提交
1122 1123 1124 1125
	@echo  ''
	@echo  'Static analysers'
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1126
	@if [ -r $(srctree)/include/asm-$(ARCH)/Kbuild ]; then \
1127 1128
	 echo  '  headers_check   - Sanity check on exported headers'; \
	 fi
L
Linus Torvalds 已提交
1129 1130
	@echo  ''
	@echo  'Kernel packaging:'
S
Sam Ravnborg 已提交
1131
	@$(MAKE) $(build)=$(package-dir) help
L
Linus Torvalds 已提交
1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
	@echo  ''
	@echo  'Documentation targets:'
	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
	@echo  ''
	@echo  'Architecture specific targets ($(ARCH)):'
	@$(if $(archhelp),$(archhelp),\
		echo '  No architecture specific help defined for $(ARCH)')
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1146
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
Linus Torvalds 已提交
1147
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1148 1149
	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
L
Linus Torvalds 已提交
1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


# Documentation targets
# ---------------------------------------------------------------------------
%docs: scripts_basic FORCE
	$(Q)$(MAKE) $(build)=Documentation/DocBook $@

else # KBUILD_EXTMOD

###
# External module support.
# When building external modules the kernel used as basis is considered
# read-only, and no consistency checks are made and the make
# system is not used on the basis kernel. If updates are required
# in the basis kernel ordinary make commands (without M=...) must
# be used.
#
# The following are the only valid targets when building external
# modules.
# make M=dir clean     Delete all automatically generated files
# make M=dir modules   Make all modules in specified dir
# make M=dir	       Same as 'make M=dir modules'
# make M=dir modules_install
S
Sam Ravnborg 已提交
1176
#                      Install the modules built in the module directory
L
Linus Torvalds 已提交
1177 1178 1179 1180
#                      Assumes install directory is already created

# We are always building modules
KBUILD_MODULES := 1
1181
PHONY += crmodverdir
L
Linus Torvalds 已提交
1182 1183
crmodverdir:
	$(Q)mkdir -p $(MODVERDIR)
1184
	$(Q)rm -f $(MODVERDIR)/*
L
Linus Torvalds 已提交
1185

1186
PHONY += $(objtree)/Module.symvers
L
Linus Torvalds 已提交
1187 1188 1189 1190 1191 1192 1193 1194
$(objtree)/Module.symvers:
	@test -e $(objtree)/Module.symvers || ( \
	echo; \
	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
	echo "           is missing; modules will have no dependencies and modversions."; \
	echo )

module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1195
PHONY += $(module-dirs) modules
L
Linus Torvalds 已提交
1196 1197 1198 1199 1200
$(module-dirs): crmodverdir $(objtree)/Module.symvers
	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)

modules: $(module-dirs)
	@echo '  Building modules, stage 2.';
S
Sam Ravnborg 已提交
1201
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
Linus Torvalds 已提交
1202

1203
PHONY += modules_install
1204
modules_install: _emodinst_ _emodinst_post
1205

1206 1207
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1208 1209
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
S
Sam Ravnborg 已提交
1210
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1211

1212 1213 1214 1215 1216 1217 1218 1219 1220
# Run depmod only is we have System.map and depmod is executable
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
      cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
                      $(DEPMOD) -ae -F System.map             \
                      $(if $(strip $(INSTALL_MOD_PATH)),      \
		      -b $(INSTALL_MOD_PATH) -r)              \
		      $(KERNELRELEASE);                       \
                   fi

1221
PHONY += _emodinst_post
1222 1223 1224
_emodinst_post: _emodinst_
	$(call cmd,depmod)

L
Linus Torvalds 已提交
1225 1226
clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))

1227
PHONY += $(clean-dirs) clean
L
Linus Torvalds 已提交
1228 1229 1230 1231 1232 1233 1234
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean:	rm-dirs := $(MODVERDIR)
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	@find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1235
		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
L
Linus Torvalds 已提交
1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
		-type f -print | xargs rm -f

help:
	@echo  '  Building external modules.'
	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
	@echo  ''
	@echo  '  modules         - default target, build the module(s)'
	@echo  '  modules_install - install the module'
	@echo  '  clean           - remove generated files in module directory only'
	@echo  ''
1247 1248

# Dummies...
1249
PHONY += prepare scripts
1250 1251
prepare: ;
scripts: ;
L
Linus Torvalds 已提交
1252 1253 1254 1255 1256 1257 1258 1259 1260
endif # KBUILD_EXTMOD

# Generate tags for editors
# ---------------------------------------------------------------------------

#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
#Adding $(srctree) adds about 20M on i386 to the size of the output file!

1261
ifeq ($(src),$(obj))
L
Linus Torvalds 已提交
1262 1263 1264 1265 1266
__srctree =
else
__srctree = $(srctree)/
endif

1267 1268 1269 1270 1271 1272 1273
ifeq ($(ALLSOURCE_ARCHS),)
ifeq ($(ARCH),um)
ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
else
ALLINCLUDE_ARCHS := $(ARCH)
endif
else
S
Sam Ravnborg 已提交
1274
#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1275 1276 1277
ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
endif

1278 1279
ALLSOURCE_ARCHS := $(ARCH)

1280 1281
define find-sources
        ( find $(__srctree) $(RCS_FIND_IGNORE) \
L
Linus Torvalds 已提交
1282
	       \( -name include -o -name arch \) -prune -o \
1283
	       -name $1 -print; \
1284 1285
	  for ARCH in $(ALLSOURCE_ARCHS) ; do \
	       find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1286
	            -name $1 -print; \
1287
	  done ; \
L
Linus Torvalds 已提交
1288
	  find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1289
	       -name $1 -print; \
L
Linus Torvalds 已提交
1290 1291
	  find $(__srctree)include $(RCS_FIND_IGNORE) \
	       \( -name config -o -name 'asm-*' \) -prune \
1292
	       -o -name $1 -print; \
1293
	  for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1294
	       find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1295
	            -name $1 -print; \
1296
	  done ; \
L
Linus Torvalds 已提交
1297
	  find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
	       -name $1 -print )
endef

define all-sources
	$(call find-sources,'*.[chS]')
endef
define all-kconfigs
	$(call find-sources,'Kconfig*')
endef
define all-defconfigs
	$(call find-sources,'defconfig')
L
Linus Torvalds 已提交
1309 1310
endef

1311 1312 1313 1314 1315
define xtags
	if $1 --version 2>&1 | grep -iq exuberant; then \
	    $(all-sources) | xargs $1 -a \
		-I __initdata,__exitdata,__acquires,__releases \
		-I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1316 1317
		--extra=+f --c-kinds=+px \
		--regex-asm='/ENTRY\(([^)]*)\).*/\1/'; \
1318 1319 1320 1321
	    $(all-kconfigs) | xargs $1 -a \
		--langdef=kconfig \
		--language-force=kconfig \
		--regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1322
	    $(all-defconfigs) | xargs -r $1 -a \
1323 1324 1325 1326 1327 1328 1329
		--langdef=dotconfig \
		--language-force=dotconfig \
		--regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
	elif $1 --version 2>&1 | grep -iq emacs; then \
	    $(all-sources) | xargs $1 -a; \
	    $(all-kconfigs) | xargs $1 -a \
		--regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1330
	    $(all-defconfigs) | xargs -r $1 -a \
1331 1332 1333 1334 1335 1336
		--regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
	else \
	    $(all-sources) | xargs $1 -a; \
	fi
endef

L
Linus Torvalds 已提交
1337
quiet_cmd_cscope-file = FILELST cscope.files
1338
      cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
L
Linus Torvalds 已提交
1339 1340

quiet_cmd_cscope = MAKE    cscope.out
1341
      cmd_cscope = cscope -b
L
Linus Torvalds 已提交
1342 1343 1344 1345 1346 1347

cscope: FORCE
	$(call cmd,cscope-file)
	$(call cmd,cscope)

quiet_cmd_TAGS = MAKE   $@
1348 1349
define cmd_TAGS
	rm -f $@; \
1350
	$(call xtags,etags)
1351 1352 1353 1354
endef

TAGS: FORCE
	$(call cmd,TAGS)
L
Linus Torvalds 已提交
1355 1356 1357 1358

quiet_cmd_tags = MAKE   $@
define cmd_tags
	rm -f $@; \
1359
	$(call xtags,ctags)
L
Linus Torvalds 已提交
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384
endef

tags: FORCE
	$(call cmd,tags)


# Scripts to check various things for consistency
# ---------------------------------------------------------------------------

includecheck:
	find * $(RCS_FIND_IGNORE) \
		-name '*.[hcS]' -type f -print | sort \
		| xargs $(PERL) -w scripts/checkincludes.pl

versioncheck:
	find * $(RCS_FIND_IGNORE) \
		-name '*.[hcS]' -type f -print | sort \
		| xargs $(PERL) -w scripts/checkversion.pl

namespacecheck:
	$(PERL) $(srctree)/scripts/namespace.pl

endif #ifeq ($(config-targets),1)
endif #ifeq ($(mixed-targets),1)

1385
PHONY += checkstack kernelrelease kernelversion
J
Jeff Dike 已提交
1386

J
Jeff Dike 已提交
1387 1388 1389 1390 1391 1392 1393 1394 1395
# UML needs a little special treatment here.  It wants to use the host
# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
# else wants $(ARCH), including people doing cross-builds, which means
# that $(SUBARCH) doesn't work here.
ifeq ($(ARCH), um)
CHECKSTACK_ARCH := $(SUBARCH)
else
CHECKSTACK_ARCH := $(ARCH)
endif
L
Linus Torvalds 已提交
1396 1397
checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
J
Jeff Dike 已提交
1398
	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
L
Linus Torvalds 已提交
1399 1400

kernelrelease:
R
Roman Zippel 已提交
1401 1402
	$(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
	$(error kernelrelease not valid - run 'make prepare' to update it))
1403
kernelversion:
1404
	@echo $(KERNELVERSION)
L
Linus Torvalds 已提交
1405

1406 1407
# Single targets
# ---------------------------------------------------------------------------
1408 1409 1410 1411 1412 1413 1414 1415 1416
# Single targets are compatible with:
# - build whith mixed source and output
# - build with separate output dir 'make O=...'
# - external modules
#
#  target-dir => where to store outputfile
#  build-dir  => directory in kernel source tree to use

ifeq ($(KBUILD_EXTMOD),)
S
Sam Ravnborg 已提交
1417
        build-dir  = $(patsubst %/,%,$(dir $@))
1418 1419 1420 1421 1422 1423 1424
        target-dir = $(dir $@)
else
        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
endif

1425
%.s: %.c prepare scripts FORCE
1426
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1427
%.i: %.c prepare scripts FORCE
1428
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1429
%.o: %.c prepare scripts FORCE
1430
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1431
%.lst: %.c prepare scripts FORCE
1432
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1433
%.s: %.S prepare scripts FORCE
1434
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1435
%.o: %.S prepare scripts FORCE
1436
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1437 1438
%.symtypes: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1439

1440 1441
# Modules
/ %/: prepare scripts FORCE
1442
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1443 1444
	$(build)=$(build-dir)
%.ko: prepare scripts FORCE
1445
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1446
	$(build)=$(build-dir) $(@:.ko=.o)
S
Sam Ravnborg 已提交
1447
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1448

L
Linus Torvalds 已提交
1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460
# FIXME Should go into a make.lib or something 
# ===========================================================================

quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
      cmd_rmdirs = rm -rf $(rm-dirs)

quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
      cmd_rmfiles = rm -f $(rm-files)


a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
	  $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1461
	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
L
Linus Torvalds 已提交
1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482

quiet_cmd_as_o_S = AS      $@
cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<

# read all saved command lines

targets := $(wildcard $(sort $(targets)))
cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))

ifneq ($(cmd_files),)
  $(cmd_files): ;	# Do not try to update included dependency files
  include $(cmd_files)
endif

# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
# Usage:
# $(Q)$(MAKE) $(clean)=dir
clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj

endif	# skip-makefile

1483
PHONY += FORCE
L
Linus Torvalds 已提交
1484
FORCE:
1485

1486 1487
# Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
Makefile: ;
1488 1489 1490 1491

# Declare the contents of the .PHONY variable as phony.  We keep that
# information in a variable se we can use it in if_changed and friends.
.PHONY: $(PHONY)