Makefile 53.7 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2
VERSION = 2
PATCHLEVEL = 6
Linus Torvalds's avatar
Linus Torvalds committed
3
SUBLEVEL = 31
Greg Kroah-Hartman's avatar
Greg Kroah-Hartman committed
4
EXTRAVERSION = .5
Linus Torvalds's avatar
Linus Torvalds committed
5
NAME = Man-Eating Seals of Antiquity
Linus Torvalds's avatar
Linus Torvalds committed
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
# Do not:
# o  use make's built-in rules and variables
15
#    (this increases performance and avoids hard-to-debug behaviour);
16 17
# o  print "Entering directory ...";
MAKEFLAGS += -rR --no-print-directory
Linus Torvalds's avatar
Linus Torvalds committed
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

# 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

38 39
ifeq ("$(origin V)", "command line")
  KBUILD_VERBOSE = $(V)
Linus Torvalds's avatar
Linus Torvalds committed
40 41 42 43 44
endif
ifndef KBUILD_VERBOSE
  KBUILD_VERBOSE = 0
endif

45 46 47 48 49 50 51 52 53
# 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.
Linus Torvalds's avatar
Linus Torvalds committed
54

55 56
ifeq ("$(origin C)", "command line")
  KBUILD_CHECKSRC = $(C)
Linus Torvalds's avatar
Linus Torvalds committed
57 58 59 60 61 62 63 64 65 66 67 68
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

69 70 71
ifeq ("$(origin M)", "command line")
  KBUILD_EXTMOD := $(M)
endif
Linus Torvalds's avatar
Linus Torvalds committed
72 73 74 75 76 77

# 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/"
78
#
Linus Torvalds's avatar
Linus Torvalds committed
79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94
# 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?
95 96
ifeq ("$(origin O)", "command line")
  KBUILD_OUTPUT := $(O)
Linus Torvalds's avatar
Linus Torvalds committed
97 98 99
endif

# That's our default target when none is given on the command line
100
PHONY := _all
Linus Torvalds's avatar
Linus Torvalds committed
101 102
_all:

103 104 105
# Cancel implicit rules on top Makefile
$(CURDIR)/Makefile Makefile: ;

Linus Torvalds's avatar
Linus Torvalds committed
106 107 108 109 110 111 112 113
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))

114 115
PHONY += $(MAKECMDGOALS) sub-make

116
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
117 118 119
	$(Q)@:

sub-make: FORCE
120 121
	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
	KBUILD_SRC=$(CURDIR) \
122 123
	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
	$(filter-out _all sub-make,$(MAKECMDGOALS))
Linus Torvalds's avatar
Linus Torvalds committed
124 125 126 127 128 129 130 131 132 133 134

# 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
135
PHONY += all
Linus Torvalds's avatar
Linus Torvalds committed
136 137 138 139 140 141 142 143 144 145 146
ifeq ($(KBUILD_EXTMOD),)
_all: all
else
_all: modules
endif

srctree		:= $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
objtree		:= $(CURDIR)
src		:= $(srctree)
obj		:= $(objtree)

147
VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds's avatar
Linus Torvalds committed
148

149
export srctree objtree VPATH
Linus Torvalds's avatar
Linus Torvalds committed
150 151 152 153 154 155 156 157 158 159


# 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/ \
160
				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
Paul Mundt's avatar
Paul Mundt committed
161
				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
162
				  -e s/sh[234].*/sh/ )
Linus Torvalds's avatar
Linus Torvalds committed
163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181

# 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
182
export KBUILD_BUILDHOST := $(SUBARCH)
Linus Torvalds's avatar
Linus Torvalds committed
183 184 185 186
ARCH		?= $(SUBARCH)
CROSS_COMPILE	?=

# Architecture as present in compile.h
187 188
UTS_MACHINE 	:= $(ARCH)
SRCARCH 	:= $(ARCH)
Linus Torvalds's avatar
Linus Torvalds committed
189

190 191 192 193 194 195 196
# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
        SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
        SRCARCH := x86
endif
197

Sam Ravnborg's avatar
Sam Ravnborg committed
198
# Additional ARCH settings for sparc
199
ifeq ($(ARCH),sparc64)
Sam Ravnborg's avatar
Sam Ravnborg committed
200
       SRCARCH := sparc
201
endif
202

203 204 205 206 207
# Additional ARCH settings for sh
ifeq ($(ARCH),sh64)
       SRCARCH := sh
endif

Sam Ravnborg's avatar
Sam Ravnborg committed
208 209 210
# Where to locate arch specific headers
hdr-arch  := $(SRCARCH)

211 212 213 214
ifeq ($(ARCH),m68knommu)
       hdr-arch  := m68k
endif

215 216
KCONFIG_CONFIG	?= .config

Linus Torvalds's avatar
Linus Torvalds committed
217 218 219 220 221
# 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)

222 223 224 225
HOSTCC       = gcc
HOSTCXX      = g++
HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
HOSTCXXFLAGS = -O2
Linus Torvalds's avatar
Linus Torvalds committed
226

227 228
# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.
Linus Torvalds's avatar
Linus Torvalds committed
229 230 231 232 233 234 235

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
236
#	make sure the checksums are up to date before we record them.
Linus Torvalds's avatar
Linus Torvalds committed
237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253

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

254
export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds's avatar
Linus Torvalds committed
255 256 257 258 259 260 261 262 263 264 265 266 267 268
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. 
269
# If it is set to "silent_", nothing will be printed at all, since
Linus Torvalds's avatar
Linus Torvalds committed
270 271
# the variable $(silent_cmd_cc_o_c) doesn't exist.
#
Adrian Bunk's avatar
Adrian Bunk committed
272
# A simple variant is to prefix commands with $(Q) - that's useful
Linus Torvalds's avatar
Linus Torvalds committed
273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300
# 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)

301 302
# We need some generic definitions (do not try to remake the file).
$(srctree)/scripts/Kbuild.include: ;
303
include $(srctree)/scripts/Kbuild.include
Linus Torvalds's avatar
Linus Torvalds committed
304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322

# 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

323 324
CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
		  -Wbitwise -Wno-return-void $(CF)
Linus Torvalds's avatar
Linus Torvalds committed
325 326 327
MODFLAGS	= -DMODULE
CFLAGS_MODULE   = $(MODFLAGS)
AFLAGS_MODULE   = $(MODFLAGS)
328
LDFLAGS_MODULE  =
Linus Torvalds's avatar
Linus Torvalds committed
329 330
CFLAGS_KERNEL	=
AFLAGS_KERNEL	=
331
CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage
Linus Torvalds's avatar
Linus Torvalds committed
332 333 334 335 336


# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
LINUXINCLUDE    := -Iinclude \
337
                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
338 339
                   -I$(srctree)/arch/$(hdr-arch)/include               \
                   -include include/linux/autoconf.h
Linus Torvalds's avatar
Linus Torvalds committed
340

341
KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds's avatar
Linus Torvalds committed
342

343
KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
344
		   -fno-strict-aliasing -fno-common \
345
		   -Werror-implicit-function-declaration \
346 347
		   -Wno-format-security \
		   -fno-delete-null-pointer-checks
348
KBUILD_AFLAGS   := -D__ASSEMBLY__
Linus Torvalds's avatar
Linus Torvalds committed
349

Roman Zippel's avatar
Roman Zippel committed
350 351
# Read KERNELRELEASE from include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
352
KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
353

354
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
355
export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
356 357
export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds's avatar
Linus Torvalds committed
358

359
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
360
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
361
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Linus Torvalds's avatar
Linus Torvalds committed
362 363 364 365 366 367 368 369

# 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

370 371
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
Linus Torvalds's avatar
Linus Torvalds committed
372 373 374 375 376

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

# Basic helpers built in scripts/
377
PHONY += scripts_basic
Linus Torvalds's avatar
Linus Torvalds committed
378 379 380
scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic

381 382 383
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

384
PHONY += outputmakefile
385 386 387
# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
Linus Torvalds's avatar
Linus Torvalds committed
388
outputmakefile:
389
ifneq ($(KBUILD_SRC),)
390
	$(Q)ln -fsn $(srctree) source
391 392 393
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif
Linus Torvalds's avatar
Linus Torvalds committed
394 395 396 397 398

# 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.
399
# For example 'make oldconfig all'.
Linus Torvalds's avatar
Linus Torvalds committed
400 401 402
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

403
no-dot-config-targets := clean mrproper distclean \
404
			 cscope TAGS tags help %docs check% \
405 406
			 include/linux/version.h headers_% \
			 kernelrelease kernelversion
Linus Torvalds's avatar
Linus Torvalds committed
407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443

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'
444
include $(srctree)/arch/$(SRCARCH)/Makefile
445
export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds's avatar
Linus Torvalds committed
446

447 448 449 450 451
config: scripts_basic outputmakefile FORCE
	$(Q)mkdir -p include/linux include/config
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

%config: scripts_basic outputmakefile FORCE
452
	$(Q)mkdir -p include/linux include/config
Linus Torvalds's avatar
Linus Torvalds committed
453 454 455 456 457 458 459 460 461 462
	$(Q)$(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
463
# in parallel
464
PHONY += scripts
465
scripts: scripts_basic include/config/auto.conf
Linus Torvalds's avatar
Linus Torvalds committed
466 467 468 469
	$(Q)$(MAKE) $(build)=$(@)

# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
470
drivers-y	:= drivers/ sound/ firmware/
Linus Torvalds's avatar
Linus Torvalds committed
471 472 473 474 475 476
net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
477 478
# Read in config
-include include/config/auto.conf
Linus Torvalds's avatar
Linus Torvalds committed
479

480
ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds's avatar
Linus Torvalds committed
481 482
# Read in dependencies to all Kconfig* files, make sure to run
# oldconfig if changes are detected.
483
-include include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
484 485

# To avoid any implicit rule to kick in, define an empty command
486
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds's avatar
Linus Torvalds committed
487

488
# If .config is newer than include/config/auto.conf, someone tinkered
489
# with it and forgot to run make oldconfig.
490
# if auto.conf.cmd is missing then we are probably in a cleaned tree so
491
# we execute the config step to be sure to catch updated Kconfig files
492
include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
493
	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
494
else
495 496 497 498 499 500 501 502 503 504 505 506 507 508
# 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
509

Linus Torvalds's avatar
Linus Torvalds committed
510 511
else
# Dummy target needed, because used as prerequisite
512
include/config/auto.conf: ;
513
endif # $(dot-config)
Linus Torvalds's avatar
Linus Torvalds committed
514 515 516 517

# 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
518
# Defaults vmlinux but it is usually overridden in the arch makefile
Linus Torvalds's avatar
Linus Torvalds committed
519 520 521
all: vmlinux

ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
522
KBUILD_CFLAGS	+= -Os
Linus Torvalds's avatar
Linus Torvalds committed
523
else
524
KBUILD_CFLAGS	+= -O2
Linus Torvalds's avatar
Linus Torvalds committed
525 526
endif

527 528
include $(srctree)/arch/$(SRCARCH)/Makefile

529
ifneq ($(CONFIG_FRAME_WARN),0)
530 531 532
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

533
# Force gcc to behave correct even for buggy distributions
534
ifndef CONFIG_CC_STACKPROTECTOR
535
KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
536
endif
537

Linus Torvalds's avatar
Linus Torvalds committed
538
ifdef CONFIG_FRAME_POINTER
539
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds's avatar
Linus Torvalds committed
540
else
541
KBUILD_CFLAGS	+= -fomit-frame-pointer
Linus Torvalds's avatar
Linus Torvalds committed
542 543 544
endif

ifdef CONFIG_DEBUG_INFO
545
KBUILD_CFLAGS	+= -g
546
KBUILD_AFLAGS	+= -gdwarf-2
Linus Torvalds's avatar
Linus Torvalds committed
547 548
endif

549
ifdef CONFIG_FUNCTION_TRACER
550 551 552
KBUILD_CFLAGS	+= -pg
endif

553 554 555 556 557
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

558
# arch Makefile may override CC so keep this after arch Makefile is included
559
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
560 561
CHECKFLAGS     += $(NOSTDINC_FLAGS)

Linus Torvalds's avatar
Linus Torvalds committed
562
# warn about C99 declaration after statement
563
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds's avatar
Linus Torvalds committed
564

565
# disable pointer signed / unsigned warnings in gcc 4.0
566
KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
Linus Torvalds's avatar
Linus Torvalds committed
567

568
# disable invalid "can't wrap" optimizations for signed / pointers
569
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
570

571 572 573
# revert to pre-gcc-4.4 behaviour of .eh_frame
KBUILD_CFLAGS	+= $(call cc-option,-fno-dwarf2-cfi-asm)

574
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590
# But warn user when we do so
warn-assign = \
$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")

ifneq ($(KCPPFLAGS),)
        $(call warn-assign,CPPFLAGS)
        KBUILD_CPPFLAGS += $(KCPPFLAGS)
endif
ifneq ($(KAFLAGS),)
        $(call warn-assign,AFLAGS)
        KBUILD_AFLAGS += $(KAFLAGS)
endif
ifneq ($(KCFLAGS),)
        $(call warn-assign,CFLAGS)
        KBUILD_CFLAGS += $(KCFLAGS)
endif
591

Roland McGrath's avatar
Roland McGrath committed
592 593 594 595 596 597
# Use --build-id when available.
LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
			      $(call ld-option, -Wl$(comma)--build-id,))
LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

598 599 600 601
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
LDFLAGS_vmlinux	+= -X
endif

Linus Torvalds's avatar
Linus Torvalds committed
602
# Default kernel image to build when no specific target is given.
603
# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds's avatar
Linus Torvalds committed
604 605 606 607 608 609 610 611 612 613 614 615 616
# 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
617
# makefile but the argument can be passed to make if needed.
Linus Torvalds's avatar
Linus Torvalds committed
618 619
#

620
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds's avatar
Linus Torvalds committed
621 622
export MODLIB

623
#
624 625 626 627 628
#  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.

629 630
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
631
mod_strip_cmd = $(STRIP) --strip-debug
632
else
633
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
634 635
endif # INSTALL_MOD_STRIP=1
else
636
mod_strip_cmd = true
637 638 639
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

Linus Torvalds's avatar
Linus Torvalds committed
640 641

ifeq ($(KBUILD_EXTMOD),)
642
core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds's avatar
Linus Torvalds committed
643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662

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
# ---------------------------------------------------------------------------
663
# vmlinux is built from the objects selected by $(vmlinux-init) and
Linus Torvalds's avatar
Linus Torvalds committed
664
# $(vmlinux-main). Most are built-in.o files from top-level directories
665
# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
Linus Torvalds's avatar
Linus Torvalds committed
666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690
# 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) $(vmlinux-main)
691
vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
692
export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
Linus Torvalds's avatar
Linus Torvalds committed
693 694 695 696 697 698 699

# 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                  \
700
      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
Linus Torvalds's avatar
Linus Torvalds committed
701 702 703 704

# Generate new vmlinux version
quiet_cmd_vmlinux_version = GEN     .version
      cmd_vmlinux_version = set -e;                     \
705 706 707 708 709 710 711
	if [ ! -r .version ]; then			\
	  rm -f .version;				\
	  echo 1 >.version;				\
	else						\
	  mv .version .old_version;			\
	  expr 0$$(cat .old_version) + 1 >.version;	\
	fi;						\
Linus Torvalds's avatar
Linus Torvalds committed
712 713 714
	$(MAKE) $(build)=init

# Generate System.map
715
quiet_cmd_sysmap = SYSMAP
Linus Torvalds's avatar
Linus Torvalds committed
716 717 718 719 720
      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
721 722
# 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
Linus Torvalds's avatar
Linus Torvalds committed
723
define rule_vmlinux__
724
	:
Linus Torvalds's avatar
Linus Torvalds committed
725 726 727 728 729
	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))

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

730 731 732 733 734 735
	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
	  echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
	$(cmd_sysmap) $@ System.map;                                         \
	if [ $$? -ne 0 ]; then                                               \
		rm -f $@;                                                    \
		/bin/false;                                                  \
Linus Torvalds's avatar
Linus Torvalds committed
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767
	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
768 769
	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
	  echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
Linus Torvalds's avatar
Linus Torvalds committed
770
	  $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
771 772 773
	$(Q)cmp -s System.map .tmp_System.map ||                             \
		(echo Inconsistent kallsyms data;                            \
		 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
Linus Torvalds's avatar
Linus Torvalds committed
774 775 776 777 778
		 rm .tmp_kallsyms* ; /bin/false )
endef

# Update vmlinux version before link
# Use + in front of this rule to silent warning about make -j1
779
# First command is ':' to allow us to use + in front of this rule
Linus Torvalds's avatar
Linus Torvalds committed
780 781
cmd_ksym_ld = $(cmd_vmlinux__)
define rule_ksym_ld
782
	: 
Linus Torvalds's avatar
Linus Torvalds committed
783 784 785 786 787 788 789
	+$(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    $@
790 791
      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
792

793
.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
Linus Torvalds's avatar
Linus Torvalds committed
794 795
	$(call if_changed_dep,as_o_S)

796
.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
Linus Torvalds's avatar
Linus Torvalds committed
797 798 799
	$(call cmd,kallsyms)

# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
800 801
.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
	$(call if_changed_rule,ksym_ld)
Linus Torvalds's avatar
Linus Torvalds committed
802

803 804
.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
	$(call if_changed,vmlinux__)
Linus Torvalds's avatar
Linus Torvalds committed
805

806 807
.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
	$(call if_changed,vmlinux__)
Linus Torvalds's avatar
Linus Torvalds committed
808 809 810 811

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

812 813 814 815 816 817 818 819 820 821
# 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

Linus Torvalds's avatar
Linus Torvalds committed
822 823
endif # ifdef CONFIG_KALLSYMS

824 825 826 827 828
# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
# relevant sections renamed as per the linker script.
quiet_cmd_vmlinux-modpost = LD      $@
      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
	 $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
Sam Ravnborg's avatar
Sam Ravnborg committed
829
	 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
830 831 832 833 834 835 836
define rule_vmlinux-modpost
	:
	+$(call cmd,vmlinux-modpost)
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
	$(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
endef

Linus Torvalds's avatar
Linus Torvalds committed
837
# vmlinux image - including updated kernel symbols
838
vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
839
ifdef CONFIG_HEADERS_CHECK
840
	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
841 842 843
endif
ifdef CONFIG_SAMPLES
	$(Q)$(MAKE) $(build)=samples
844 845 846
endif
ifdef CONFIG_BUILD_DOCSRC
	$(Q)$(MAKE) $(build)=Documentation
847
endif
848
	$(call vmlinux-modpost)
Linus Torvalds's avatar
Linus Torvalds committed
849
	$(call if_changed_rule,vmlinux__)
850
	$(Q)rm -f .old_version
Linus Torvalds's avatar
Linus Torvalds committed
851

852
# build vmlinux.o first to catch section mismatch errors early
853 854 855
ifdef CONFIG_KALLSYMS
.tmp_vmlinux1: vmlinux.o
endif
Sam Ravnborg's avatar
Sam Ravnborg committed
856 857 858

modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
859 860
	$(call if_changed_rule,vmlinux-modpost)

Linus Torvalds's avatar
Linus Torvalds committed
861 862 863 864 865 866 867 868 869 870
# 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

871
PHONY += $(vmlinux-dirs)
872
$(vmlinux-dirs): prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
873 874
	$(Q)$(MAKE) $(build)=$@

875 876
# Build the kernel release string
#
877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893
# 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)
894
#	    localversion*		(files without backups, containing '~')
895 896 897 898 899 900 901 902 903
#	    $(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.
904

905 906
pattern = ".*/localversion[^~]*"
string  = $(shell cat /dev/null \
907
	   `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
908

909 910
localver = $(subst $(space),, $(string) \
			      $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
911

912 913
# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
# and if the SCM is know a tag from the SCM is appended.
914
# The appended tag is determined by the SCM used.
915
#
916 917 918
# .scmversion is used when generating rpm packages so we do not loose
# the version information from the SCM when we do the build of the kernel
# from the copied source
919
ifdef CONFIG_LOCALVERSION_AUTO
920 921 922 923 924 925 926 927

ifeq ($(wildcard .scmversion),)
        _localver-auto = $(shell $(CONFIG_SHELL) \
                         $(srctree)/scripts/setlocalversion $(srctree))
else
        _localver-auto = $(shell cat .scmversion 2> /dev/null)
endif

928 929 930 931 932
	localver-auto  = $(LOCALVERSION)$(_localver-auto)
endif

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

Roman Zippel's avatar
Roman Zippel committed
933
# Store (new) KERNELRELASE string in include/config/kernel.release
934
kernelrelease = $(KERNELVERSION)$(localver-full)
Roman Zippel's avatar
Roman Zippel committed
935
include/config/kernel.release: include/config/auto.conf FORCE
936 937
	$(Q)rm -f $@
	$(Q)echo $(kernelrelease) > $@
938 939


Linus Torvalds's avatar
Linus Torvalds committed
940
# Things we need to do before we recursively start building the kernel
941 942 943 944
# 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.
Linus Torvalds's avatar
Linus Torvalds committed
945

946
# Listed in dependency order
947
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
948

949
# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds's avatar
Linus Torvalds committed
950 951 952
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
# 2) Create the include2 directory, used for the second asm symlink
Roman Zippel's avatar
Roman Zippel committed
953
prepare3: include/config/kernel.release
Linus Torvalds's avatar
Linus Torvalds committed
954
ifneq ($(KBUILD_SRC),)
955
	@$(kecho) '  Using $(srctree) as source for kernel'
956
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Linus Torvalds's avatar
Linus Torvalds committed
957 958 959 960
		echo "  $(srctree) is not clean, please run 'make mrproper'";\
		echo "  in the '$(srctree)' directory.";\
		/bin/false; \
	fi;
961 962
	$(Q)if [ ! -d include2 ]; then                                  \
	    mkdir -p include2;                                          \
963
	    ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
964
	fi
Linus Torvalds's avatar
Linus Torvalds committed
965 966
endif

967 968
# prepare2 creates a makefile if using a separate output directory
prepare2: prepare3 outputmakefile
Linus Torvalds's avatar
Linus Torvalds committed
969

970 971
prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
                   include/asm include/config/auto.conf
972
	$(cmd_crmodverdir)
Linus Torvalds's avatar
Linus Torvalds committed
973

974 975 976
archprepare: prepare1 scripts_basic

prepare0: archprepare FORCE
977
	$(Q)$(MAKE) $(build)=.
978
	$(Q)$(MAKE) $(build)=. missing-syscalls
979

Linus Torvalds's avatar
Linus Torvalds committed
980
# All the preparing..
981
prepare: prepare0
Linus Torvalds's avatar
Linus Torvalds committed
982

983 984
# The asm symlink changes when $(ARCH) changes.
# Detect this and ask user to run make mrproper
Sam Ravnborg's avatar
Sam Ravnborg committed
985
# If asm is a stale symlink (point to dir that does not exist) remove it
986 987 988 989 990
define check-symlink
	set -e;                                                            \
	if [ -L include/asm ]; then                                        \
		asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
		if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
991 992
			echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
			echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
993 994
			exit 1;                                            \
		fi;                                                        \
Sam Ravnborg's avatar
Sam Ravnborg committed
995 996 997 998
		test -e $$asmlink || rm include/asm;                       \
	elif [ -d include/asm ]; then                                      \
		echo "ERROR: $@ is a directory but a symlink was expected";\
		exit 1;                                                    \
999
	fi
1000 1001 1002
endef

# We create the target directory of the symlink if it does
1003
# not exist so the test in check-symlink works and we have a
1004 1005 1006
# directory for generated filesas used by some architectures.
define create-symlink
	if [ ! -L include/asm ]; then                                      \
1007
			$(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1008 1009 1010 1011
			if [ ! -d include/asm-$(SRCARCH) ]; then           \
				mkdir -p include/asm-$(SRCARCH);           \
			fi;                                                \
			ln -fsn asm-$(SRCARCH) $@;                         \
1012
	fi
1013 1014 1015 1016 1017
endef

include/asm: FORCE
	$(Q)$(check-symlink)
	$(Q)$(create-symlink)
Linus Torvalds's avatar
Linus Torvalds committed
1018 1019 1020 1021 1022 1023 1024 1025

# 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
1026 1027 1028 1029 1030 1031 1032
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
Linus Torvalds's avatar
Linus Torvalds committed
1033 1034

define filechk_version.h
1035 1036 1037
	(echo \#define LINUX_VERSION_CODE $(shell                             \
	expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
Linus Torvalds's avatar
Linus Torvalds committed
1038 1039
endef

1040
include/linux/version.h: $(srctree)/Makefile FORCE
Linus Torvalds's avatar
Linus Torvalds committed
1041 1042
	$(call filechk,version.h)

1043 1044 1045
include/linux/utsrelease.h: include/config/kernel.release FORCE
	$(call filechk,utsrelease.h)

1046 1047 1048 1049
PHONY += headerdep
headerdep:
	$(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl

Linus Torvalds's avatar
Linus Torvalds committed
1050 1051
# ---------------------------------------------------------------------------

1052
PHONY += depend dep
Linus Torvalds's avatar
Linus Torvalds committed
1053 1054 1055
depend dep:
	@echo '*** Warning: make $@ is unnecessary now.'

1056 1057 1058 1059 1060 1061 1062 1063 1064 1065
# ---------------------------------------------------------------------------
# Firmware install
INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
export INSTALL_FW_PATH

PHONY += firmware_install
firmware_install: FORCE
	@mkdir -p $(objtree)/firmware
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install

1066 1067 1068
# ---------------------------------------------------------------------------
# Kernel headers

1069 1070
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1071

1072
hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1073 1074 1075 1076 1077 1078 1079 1080
# Find out where the Kbuild file is located to support
# arch/$(ARCH)/include/asm
hdr-dir = $(strip                                                         \
          $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
               arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))

# If we do an all arch process set dst to asm-$(hdr-arch)
hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1081 1082 1083

PHONY += __headers
__headers: include/linux/version.h scripts_basic FORCE
1084
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1085 1086

PHONY += headers_install_all
1087 1088
headers_install_all:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1089

1090
PHONY += headers_install
1091
headers_install: __headers
1092 1093
	$(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
	$(error Headers not exportable for the $(SRCARCH) architecture))
1094
	$(Q)$(MAKE) $(hdr-inst)=include
1095
	$(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1096

1097 1098
PHONY += headers_check_all
headers_check_all: headers_install_all
1099
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1100

1101 1102
PHONY += headers_check
headers_check: headers_install
1103
	$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1104
	$(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1105

Linus Torvalds's avatar
Linus Torvalds committed
1106 1107 1108 1109 1110
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

1111
# By default, build modules as well
Linus Torvalds's avatar
Linus Torvalds committed
1112 1113 1114 1115

all: modules

#	Build modules
Tejun Heo's avatar
Tejun Heo committed
1116 1117 1118 1119
#
#	A module can be listed more than once in obj-m resulting in
#	duplicate lines in modules.order files.  Those are removed
#	using awk while concatenating to the final file.
Linus Torvalds's avatar
Linus Torvalds committed
1120

1121
PHONY += modules
Linus Torvalds's avatar
Linus Torvalds committed
1122
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
Tejun Heo's avatar
Tejun Heo committed
1123
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1124
	@$(kecho) '  Building modules, stage 2.';
1125
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1126
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
Linus Torvalds's avatar
Linus Torvalds committed
1127 1128 1129


# Target to prepare building external modules
1130
PHONY += modules_prepare
1131
modules_prepare: prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
1132 1133

# Target to install modules
1134
PHONY += modules_install
Linus Torvalds's avatar
Linus Torvalds committed
1135 1136
modules_install: _modinst_ _modinst_post

1137
PHONY += _modinst_
Linus Torvalds's avatar
Linus Torvalds committed
1138
_modinst_:
1139
	@if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
Linus Torvalds's avatar
Linus Torvalds committed
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
		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
Tejun Heo's avatar
Tejun Heo committed
1152
	@cp -f $(objtree)/modules.order $(MODLIB)/
1153
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds's avatar
Linus Torvalds committed
1154

1155
# This depmod is only for convenience to give the initial
Linus Torvalds's avatar
Linus Torvalds committed
1156 1157
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1158
PHONY += _modinst_post
Linus Torvalds's avatar
Linus Torvalds committed
1159
_modinst_post: _modinst_
1160
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1161
	$(call cmd,depmod)
Linus Torvalds's avatar
Linus Torvalds committed
1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190

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'
1191
MRPROPER_DIRS  += include/config include2 usr/include include/generated
1192
MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1193 1194
                  include/linux/autoconf.h include/linux/version.h      \
                  include/linux/utsrelease.h                            \
1195
                  include/linux/bounds.h include/asm*/asm-offsets.h     \
1196
		  Module.symvers Module.markers tags TAGS cscope*
Linus Torvalds's avatar
Linus Torvalds committed
1197 1198 1199 1200 1201

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1202
clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
Linus Torvalds's avatar
Linus Torvalds committed
1203

1204
PHONY += $(clean-dirs) clean archclean
Linus Torvalds's avatar
Linus Torvalds committed
1205 1206 1207 1208 1209 1210 1211
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean: archclean $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
	@find . $(RCS_FIND_IGNORE) \
1212
		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1213
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1214
		-o -name '*.symtypes' -o -name 'modules.order' \
1215 1216
		-o -name 'Module.markers' -o -name '.tmp_*.o.*' \
		-o -name '*.gcno' \) -type f -print | xargs rm -f
Linus Torvalds's avatar
Linus Torvalds committed
1217 1218 1219 1220 1221 1222 1223

# 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)

1224
PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds's avatar
Linus Torvalds committed
1225 1226 1227 1228 1229 1230 1231 1232 1233
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

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

# distclean
#
1234
PHONY += distclean
Linus Torvalds's avatar
Linus Torvalds committed
1235 1236 1237

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
1238
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds's avatar
Linus Torvalds committed
1239
		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1240
		-o -name '.*.rej' -o -size 0 \
Linus Torvalds's avatar
Linus Torvalds committed
1241 1242 1243 1244 1245 1246 1247 1248 1249
		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
		-type f -print | xargs rm -f


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

1250
%pkg: include/config/kernel.release FORCE
1251
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1252
rpm: include/config/kernel.release FORCE
1253
	$(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds's avatar
Linus Torvalds committed
1254 1255 1256 1257 1258


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

1259
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Linus Torvalds's avatar
Linus Torvalds committed
1260
boards := $(notdir $(boards))
1261 1262
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds's avatar
Linus Torvalds committed
1263 1264 1265

help:
	@echo  'Cleaning targets:'
1266
	@echo  '  clean		  - Remove most generated files but keep the config and'
1267
	@echo  '                    enough build support to build external modules'
1268
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1269
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
Linus Torvalds's avatar
Linus Torvalds committed
1270 1271 1272 1273 1274 1275 1276 1277
	@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'
1278
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1279 1280
	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
Linus Torvalds's avatar
Linus Torvalds committed
1281 1282
	@echo  '  dir/            - Build all files in dir and below'
	@echo  '  dir/file.[ois]  - Build specified target only'
1283
	@echo  '  dir/file.ko     - Build module including final link'
1284
	@echo  '  modules_prepare - Set up for building external modules'
Linus Torvalds's avatar
Linus Torvalds committed
1285 1286
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1287
	@echo  '  kernelrelease	  - Output the release version string'
1288
	@echo  '  kernelversion	  - Output the version stored in Makefile'
1289
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1290
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1291
	 echo  ''
Linus Torvalds's avatar
Linus Torvalds committed
1292 1293 1294
	@echo  'Static analysers'
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1295
	@echo  '  versioncheck    - Sanity check on version.h usage'
1296
	@echo  '  includecheck    - Check for duplicate included header files'
1297
	@echo  '  export_report   - List the usages of all exported symbols'
1298 1299
	@echo  '  headers_check   - Sanity check on exported headers'
	@echo  '  headerdep       - Detect inclusion cycles in headers'; \
1300
	 echo  ''
Linus Torvalds's avatar
Linus Torvalds committed
1301
	@echo  'Kernel packaging:'
1302
	@$(MAKE) $(build)=$(package-dir) help
Linus Torvalds's avatar
Linus Torvalds committed
1303 1304 1305 1306
	@echo  ''
	@echo  'Documentation targets:'
	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
	@echo  ''
1307
	@echo  'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds's avatar
Linus Torvalds committed
1308
	@$(if $(archhelp),$(archhelp),\
1309
		echo '  No architecture specific help defined for $(SRCARCH)')
Linus Torvalds's avatar
Linus Torvalds committed
1310 1311 1312 1313 1314
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1315 1316 1317 1318 1319
	@$(if $(board-dirs), \
		$(foreach b, $(board-dirs), \
		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
		printf "  %-16s - Show all of the above\\n" help-boards; \
		echo '')
Linus Torvalds's avatar
Linus Torvalds committed
1320 1321

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1322
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
Linus Torvalds's avatar
Linus Torvalds committed
1323
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1324 1325
	@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'
Linus Torvalds's avatar
Linus Torvalds committed
1326 1327 1328 1329 1330
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344
help-board-dirs := $(addprefix help-,$(board-dirs))

help-boards: $(help-board-dirs)

boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(SRCARCH) $*):'
	@$(if $(boards-per-dir), \
		$(foreach b, $(boards-per-dir), \
		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
		echo '')


Linus Torvalds's avatar
Linus Torvalds committed
1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365
# 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
1366
#                      Install the modules built in the module directory
Linus Torvalds's avatar
Linus Torvalds committed
1367 1368 1369 1370
#                      Assumes install directory is already created

# We are always building modules
KBUILD_MODULES := 1
1371
PHONY += crmodverdir
Linus Torvalds's avatar
Linus Torvalds committed
1372
crmodverdir:
1373
	$(cmd_crmodverdir)
Linus Torvalds's avatar
Linus Torvalds committed
1374

1375
PHONY += $(objtree)/Module.symvers
Linus Torvalds's avatar
Linus Torvalds committed
1376 1377 1378 1379 1380 1381 1382 1383
$(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))
1384
PHONY += $(module-dirs) modules
Linus Torvalds's avatar
Linus Torvalds committed
1385 1386 1387 1388
$(module-dirs): crmodverdir $(objtree)/Module.symvers
	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)

modules: $(module-dirs)
1389
	@$(kecho) '  Building modules, stage 2.';
1390
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds's avatar
Linus Torvalds committed
1391

1392
PHONY += modules_install
1393
modules_install: _emodinst_ _emodinst_post
1394

1395 1396
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1397 1398
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1399
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds's avatar
Linus Torvalds committed
1400

1401
PHONY += _emodinst_post
1402 1403 1404
_emodinst_post: _emodinst_
	$(call cmd,depmod)

Linus Torvalds's avatar
Linus Torvalds committed
1405 1406
clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))

1407
PHONY += $(clean-dirs) clean
Linus Torvalds's avatar
Linus Torvalds committed
1408 1409 1410 1411
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean:	rm-dirs := $(MODVERDIR)
1412 1413 1414
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
                   $(KBUILD_EXTMOD)/Module.markers \
                   $(KBUILD_EXTMOD)/modules.order
Linus Torvalds's avatar
Linus Torvalds committed
1415 1416
clean: $(clean-dirs)
	$(call cmd,rmdirs)
1417
	$(call cmd,rmfiles)
Linus Torvalds's avatar
Linus Torvalds committed
1418
	@find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1419
		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1420 1421
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
		-o -name '*.gcno' \) -type f -print | xargs rm -f
Linus Torvalds's avatar
Linus Torvalds committed
1422 1423 1424 1425 1426 1427 1428 1429 1430

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  ''
1431 1432

# Dummies...
1433
PHONY += prepare scripts
1434 1435
prepare: ;
scripts: ;
Linus Torvalds's avatar
Linus Torvalds committed
1436 1437 1438 1439
endif # KBUILD_EXTMOD

# Generate tags for editors
# ---------------------------------------------------------------------------
1440 1441
quiet_cmd_tags = GEN     $@
      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
Linus Torvalds's avatar
Linus Torvalds committed
1442

1443
tags TAGS cscope: FORCE
Linus Torvalds's avatar
Linus Torvalds committed
1444 1445 1446 1447 1448 1449 1450 1451
	$(call cmd,tags)

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

includecheck:
	find * $(RCS_FIND_IGNORE) \
		-name '*.[hcS]' -type f -print | sort \
1452
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
Linus Torvalds's avatar
Linus Torvalds committed
1453 1454 1455 1456

versioncheck:
	find * $(RCS_FIND_IGNORE) \
		-name '*.[hcS]' -type f -print | sort \
1457
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
Linus Torvalds's avatar
Linus Torvalds committed
1458 1459 1460 1461

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

1462 1463 1464
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

Linus Torvalds's avatar
Linus Torvalds committed
1465 1466 1467
endif #ifeq ($(config-targets),1)
endif #ifeq ($(mixed-targets),1)

1468
PHONY += checkstack kernelrelease kernelversion
1469

1470 1471 1472 1473 1474 1475 1476 1477 1478
# 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
Linus Torvalds's avatar
Linus Torvalds committed
1479 1480
checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1481
	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds's avatar
Linus Torvalds committed
1482 1483

kernelrelease:
Roman Zippel's avatar
Roman Zippel committed
1484 1485
	$(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
	$(error kernelrelease not valid - run 'make prepare' to update it))
1486
kernelversion:
1487
	@echo $(KERNELVERSION)
Linus Torvalds's avatar
Linus Torvalds committed
1488

1489 1490
# Single targets
# ---------------------------------------------------------------------------
1491
# Single targets are compatible with:
Robert P. J. Day's avatar
Robert P. J. Day committed
1492
# - build with mixed source and output
1493 1494 1495 1496 1497 1498 1499
# - 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),)
Sam Ravnborg's avatar
Sam Ravnborg committed
1500
        build-dir  = $(patsubst %/,%,$(dir $@))
1501 1502 1503 1504 1505 1506 1507
        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

1508
%.s: %.c prepare scripts FORCE
1509
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1510
%.i: %.c prepare scripts FORCE
1511
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1512
%.o: %.c prepare scripts FORCE
1513
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1514
%.lst: %.c prepare scripts FORCE
1515
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1516
%.s: %.S prepare scripts FORCE
1517
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1518
%.o: %.S prepare scripts FORCE
1519
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1520 1521
%.symtypes: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1522

1523
# Modules
1524 1525 1526 1527 1528
/: prepare scripts FORCE
	$(cmd_crmodverdir)
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
	$(build)=$(build-dir)
%/: prepare scripts FORCE
1529
	$(cmd_crmodverdir)
1530
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1531 1532
	$(build)=$(build-dir)
%.ko: prepare scripts FORCE
1533
	$(cmd_crmodverdir)
1534
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1535
	$(build)=$(build-dir) $(@:.ko=.o)
1536
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1537

Linus Torvalds's avatar
Linus Torvalds committed
1538 1539 1540 1541 1542 1543 1544 1545 1546
# 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)

1547
# Run depmod only if we have System.map and depmod is executable
1548 1549
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
      cmd_depmod = \
1550
	if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1551
		$(DEPMOD) -ae -F System.map                                     \
1552
		$(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1553 1554 1555
		$(KERNELRELEASE);                                               \
	fi

1556
# Create temporary dir for module support files
1557 1558 1559
# clean it up only when building all modules
cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
Linus Torvalds's avatar
Linus Torvalds committed
1560

1561
a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1562
	  $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1563
	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
Linus Torvalds's avatar
Linus Torvalds committed
1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584

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

1585
PHONY += FORCE
Linus Torvalds's avatar
Linus Torvalds committed
1586
FORCE:
1587 1588

# Declare the contents of the .PHONY variable as phony.  We keep that
1589
# information in a variable so we can use it in if_changed and friends.
1590
.PHONY: $(PHONY)