Makefile 51.8 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 = 32
Linus Torvalds's avatar
Linus Torvalds committed
4
EXTRAVERSION =
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)
183 184
ARCH		?= $(SUBARCH)
CROSS_COMPILE	?=
Linus Torvalds's avatar
Linus Torvalds committed
185 186

# 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
HOSTCC       = gcc
HOSTCXX      = g++
224
HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
225
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

# 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
318
INSTALLKERNEL  := installkernel
Linus Torvalds's avatar
Linus Torvalds committed
319 320 321 322 323
DEPMOD		= /sbin/depmod
KALLSYMS	= scripts/kallsyms
PERL		= perl
CHECK		= sparse

324 325
CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
		  -Wbitwise -Wno-return-void $(CF)
Linus Torvalds's avatar
Linus Torvalds committed
326 327 328
MODFLAGS	= -DMODULE
CFLAGS_MODULE   = $(MODFLAGS)
AFLAGS_MODULE   = $(MODFLAGS)
329
LDFLAGS_MODULE  = -T $(srctree)/scripts/module-common.lds
Linus Torvalds's avatar
Linus Torvalds committed
330 331
CFLAGS_KERNEL	=
AFLAGS_KERNEL	=
332
CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage
Linus Torvalds's avatar
Linus Torvalds committed
333 334 335 336


# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
337
LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
338
                   $(if $(KBUILD_SRC), -I$(srctree)/include) \
339
                   -include include/generated/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
export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
358
export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds's avatar
Linus Torvalds committed
359

360
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
361
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
362
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Linus Torvalds's avatar
Linus Torvalds committed
363 364 365 366 367 368 369 370

# 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

371 372
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
373 374 375 376 377

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

# Basic helpers built in scripts/
378
PHONY += scripts_basic
Linus Torvalds's avatar
Linus Torvalds committed
379 380
scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic
381
	$(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds's avatar
Linus Torvalds committed
382

383 384 385
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

386
PHONY += outputmakefile
387 388 389
# 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
390
outputmakefile:
391
ifneq ($(KBUILD_SRC),)
392
	$(Q)ln -fsn $(srctree) source
393 394 395
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif
Linus Torvalds's avatar
Linus Torvalds committed
396 397 398 399 400

# 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.
401
# For example 'make oldconfig all'.
Linus Torvalds's avatar
Linus Torvalds committed
402 403 404
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

405
no-dot-config-targets := clean mrproper distclean \
406
			 cscope TAGS tags help %docs check% \
407 408
			 include/linux/version.h headers_% \
			 kernelrelease kernelversion
Linus Torvalds's avatar
Linus Torvalds committed
409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445

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'
446
include $(srctree)/arch/$(SRCARCH)/Makefile
447
export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds's avatar
Linus Torvalds committed
448

449 450 451 452 453
config: scripts_basic outputmakefile FORCE
	$(Q)mkdir -p include/linux include/config
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

%config: scripts_basic outputmakefile FORCE
454
	$(Q)mkdir -p include/linux include/config
Linus Torvalds's avatar
Linus Torvalds committed
455 456 457 458 459 460 461 462 463 464
	$(Q)$(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
465
# in parallel
466
PHONY += scripts
467
scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
Linus Torvalds's avatar
Linus Torvalds committed
468 469 470 471
	$(Q)$(MAKE) $(build)=$(@)

# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
472
drivers-y	:= drivers/ sound/ firmware/
Linus Torvalds's avatar
Linus Torvalds committed
473 474 475 476 477 478
net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
479 480
# Read in config
-include include/config/auto.conf
Linus Torvalds's avatar
Linus Torvalds committed
481

482
ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds's avatar
Linus Torvalds committed
483 484
# Read in dependencies to all Kconfig* files, make sure to run
# oldconfig if changes are detected.
485
-include include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
486 487

# To avoid any implicit rule to kick in, define an empty command
488
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds's avatar
Linus Torvalds committed
489

490
# If .config is newer than include/config/auto.conf, someone tinkered
491
# with it and forgot to run make oldconfig.
492
# if auto.conf.cmd is missing then we are probably in a cleaned tree so
493
# we execute the config step to be sure to catch updated Kconfig files
494
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
495
	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
496
else
497
# external modules needs include/generated/autoconf.h and include/config/auto.conf
498 499 500 501
# 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:
502
	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
503 504
	echo;								\
	echo "  ERROR: Kernel configuration is invalid.";		\
505
	echo "         include/generated/autoconf.h or $@ are missing.";\
506 507 508 509 510
	echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
	echo;								\
	/bin/false)

endif # KBUILD_EXTMOD
511

Linus Torvalds's avatar
Linus Torvalds committed
512 513
else
# Dummy target needed, because used as prerequisite
514
include/config/auto.conf: ;
515
endif # $(dot-config)
Linus Torvalds's avatar
Linus Torvalds committed
516 517 518 519

# 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
520
# Defaults vmlinux but it is usually overridden in the arch makefile
Linus Torvalds's avatar
Linus Torvalds committed
521 522 523
all: vmlinux

ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
524
KBUILD_CFLAGS	+= -Os
Linus Torvalds's avatar
Linus Torvalds committed
525
else
526
KBUILD_CFLAGS	+= -O2
Linus Torvalds's avatar
Linus Torvalds committed
527 528
endif

Ralf Baechle's avatar
Ralf Baechle committed
529 530
include $(srctree)/arch/$(SRCARCH)/Makefile

531
ifneq ($(CONFIG_FRAME_WARN),0)
532 533 534
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

535
# Force gcc to behave correct even for buggy distributions
Tejun Heo's avatar
Tejun Heo committed
536
ifndef CONFIG_CC_STACKPROTECTOR
537
KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
Tejun Heo's avatar
Tejun Heo committed
538
endif
539

Linus Torvalds's avatar
Linus Torvalds committed
540
ifdef CONFIG_FRAME_POINTER
541
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds's avatar
Linus Torvalds committed
542
else
543
KBUILD_CFLAGS	+= -fomit-frame-pointer
Linus Torvalds's avatar
Linus Torvalds committed
544 545 546
endif

ifdef CONFIG_DEBUG_INFO
547
KBUILD_CFLAGS	+= -g
548
KBUILD_AFLAGS	+= -gdwarf-2
Linus Torvalds's avatar
Linus Torvalds committed
549 550
endif

551
ifdef CONFIG_FUNCTION_TRACER
552 553 554
KBUILD_CFLAGS	+= -pg
endif

555 556 557 558 559
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

560
# arch Makefile may override CC so keep this after arch Makefile is included
561
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
562 563
CHECKFLAGS     += $(NOSTDINC_FLAGS)

Linus Torvalds's avatar
Linus Torvalds committed
564
# warn about C99 declaration after statement
565
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds's avatar
Linus Torvalds committed
566

567
# disable pointer signed / unsigned warnings in gcc 4.0
568
KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
Linus Torvalds's avatar
Linus Torvalds committed
569

570
# disable invalid "can't wrap" optimizations for signed / pointers
571
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
572

Kyle McMartin's avatar
Kyle McMartin committed
573 574 575
# revert to pre-gcc-4.4 behaviour of .eh_frame
KBUILD_CFLAGS	+= $(call cc-option,-fno-dwarf2-cfi-asm)

576 577 578
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

579
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595
# 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
596

Roland McGrath's avatar
Roland McGrath committed
597 598
# Use --build-id when available.
LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
599
			      $(call cc-ldoption, -Wl$(comma)--build-id,))
Roland McGrath's avatar
Roland McGrath committed
600 601 602
LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

603
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
604
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
605 606
endif

Linus Torvalds's avatar
Linus Torvalds committed
607
# Default kernel image to build when no specific target is given.
608
# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds's avatar
Linus Torvalds committed
609 610 611 612 613 614 615 616 617 618 619 620 621
# 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
622
# makefile but the argument can be passed to make if needed.
Linus Torvalds's avatar
Linus Torvalds committed
623 624
#

625
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds's avatar
Linus Torvalds committed
626 627
export MODLIB

628
#
629 630 631 632 633
#  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.

634 635
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
636
mod_strip_cmd = $(STRIP) --strip-debug
637
else
638
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
639 640
endif # INSTALL_MOD_STRIP=1
else
641
mod_strip_cmd = true
642 643 644
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

Linus Torvalds's avatar
Linus Torvalds committed
645 646

ifeq ($(KBUILD_EXTMOD),)
647
core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds's avatar
Linus Torvalds committed
648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667

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
# ---------------------------------------------------------------------------
668
# vmlinux is built from the objects selected by $(vmlinux-init) and
Linus Torvalds's avatar
Linus Torvalds committed
669
# $(vmlinux-main). Most are built-in.o files from top-level directories
670
# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
Linus Torvalds's avatar
Linus Torvalds committed
671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695
# 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) $(vmlinux-main)
696
vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
697
export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
Linus Torvalds's avatar
Linus Torvalds committed
698 699 700 701 702 703 704

# 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                  \
705
      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
Linus Torvalds's avatar
Linus Torvalds committed
706 707 708 709

# Generate new vmlinux version
quiet_cmd_vmlinux_version = GEN     .version
      cmd_vmlinux_version = set -e;                     \
710 711 712 713 714 715 716
	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
717 718 719
	$(MAKE) $(build)=init

# Generate System.map
720
quiet_cmd_sysmap = SYSMAP
Linus Torvalds's avatar
Linus Torvalds committed
721 722 723 724 725
      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
726 727
# 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
728
define rule_vmlinux__
729
	:
Linus Torvalds's avatar
Linus Torvalds committed
730 731 732 733 734
	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))

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

735 736 737 738 739 740
	$(Q)$(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
741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
	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
773 774
	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
	  echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
Linus Torvalds's avatar
Linus Torvalds committed
775
	  $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
776 777 778
	$(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
779 780 781 782 783
		 rm .tmp_kallsyms* ; /bin/false )
endef

# Update vmlinux version before link
# Use + in front of this rule to silent warning about make -j1
Sam Ravnborg's avatar
Sam Ravnborg committed
784
# First command is ':' to allow us to use + in front of this rule
Linus Torvalds's avatar
Linus Torvalds committed
785 786
cmd_ksym_ld = $(cmd_vmlinux__)
define rule_ksym_ld
Sam Ravnborg's avatar
Sam Ravnborg committed
787
	: 
Linus Torvalds's avatar
Linus Torvalds committed
788 789 790 791 792 793 794
	+$(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    $@
795 796
      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
797

798
.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
Linus Torvalds's avatar
Linus Torvalds committed
799 800
	$(call if_changed_dep,as_o_S)

801
.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
Linus Torvalds's avatar
Linus Torvalds committed
802 803 804
	$(call cmd,kallsyms)

# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
805 806
.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
	$(call if_changed_rule,ksym_ld)
Linus Torvalds's avatar
Linus Torvalds committed
807

808 809
.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
	$(call if_changed,vmlinux__)
Linus Torvalds's avatar
Linus Torvalds committed
810

811 812
.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
	$(call if_changed,vmlinux__)
Linus Torvalds's avatar
Linus Torvalds committed
813 814 815 816

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

817 818 819 820 821 822 823 824 825 826
# 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
827 828
endif # ifdef CONFIG_KALLSYMS

829 830 831 832 833
# 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
834
	 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
835 836 837 838 839 840 841
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
842
# vmlinux image - including updated kernel symbols
843
vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
844
ifdef CONFIG_HEADERS_CHECK
845
	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
846 847 848
endif
ifdef CONFIG_SAMPLES
	$(Q)$(MAKE) $(build)=samples
849 850 851
endif
ifdef CONFIG_BUILD_DOCSRC
	$(Q)$(MAKE) $(build)=Documentation
852
endif
853
	$(call vmlinux-modpost)
Linus Torvalds's avatar
Linus Torvalds committed
854
	$(call if_changed_rule,vmlinux__)
855
	$(Q)rm -f .old_version
Linus Torvalds's avatar
Linus Torvalds committed
856

857
# build vmlinux.o first to catch section mismatch errors early
Sam Ravnborg's avatar
Sam Ravnborg committed
858 859 860
ifdef CONFIG_KALLSYMS
.tmp_vmlinux1: vmlinux.o
endif
Sam Ravnborg's avatar
Sam Ravnborg committed
861 862 863

modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
864 865
	$(call if_changed_rule,vmlinux-modpost)

Linus Torvalds's avatar
Linus Torvalds committed
866 867 868 869 870 871 872 873 874 875
# 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

876
PHONY += $(vmlinux-dirs)
877
$(vmlinux-dirs): prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
878
	$(Q)$(MAKE) $(build)=$@
879 880 881
ifdef CONFIG_MODULES
	$(Q)$(MAKE) $(modbuiltin)=$@
endif
Linus Torvalds's avatar
Linus Torvalds committed
882

883 884
# Build the kernel release string
#
885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901
# 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)
902
#	    localversion*		(files without backups, containing '~')
903 904 905 906 907 908 909 910 911
#	    $(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.
912

913 914
pattern = ".*/localversion[^~]*"
string  = $(shell cat /dev/null \
915
	   `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
916

917 918
localver = $(subst $(space),, $(string) \
			      $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
919

920 921
# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
# and if the SCM is know a tag from the SCM is appended.
922
# The appended tag is determined by the SCM used.
923
#
924 925 926
# .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
927
ifdef CONFIG_LOCALVERSION_AUTO
928 929 930 931 932 933 934 935

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

936 937 938 939 940
	localver-auto  = $(LOCALVERSION)$(_localver-auto)
endif

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

Roman Zippel's avatar
Roman Zippel committed
941
# Store (new) KERNELRELASE string in include/config/kernel.release
942
kernelrelease = $(KERNELVERSION)$(localver-full)
Roman Zippel's avatar
Roman Zippel committed
943
include/config/kernel.release: include/config/auto.conf FORCE
944 945
	$(Q)rm -f $@
	$(Q)echo $(kernelrelease) > $@
946 947


Linus Torvalds's avatar
Linus Torvalds committed
948
# Things we need to do before we recursively start building the kernel
949 950 951 952
# 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
953

954
# Listed in dependency order
955
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
956

957
# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds's avatar
Linus Torvalds committed
958 959
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
Roman Zippel's avatar
Roman Zippel committed
960
prepare3: include/config/kernel.release
Linus Torvalds's avatar
Linus Torvalds committed
961
ifneq ($(KBUILD_SRC),)
962
	@$(kecho) '  Using $(srctree) as source for kernel'
963
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Linus Torvalds's avatar
Linus Torvalds committed
964 965 966 967 968 969
		echo "  $(srctree) is not clean, please run 'make mrproper'";\
		echo "  in the '$(srctree)' directory.";\
		/bin/false; \
	fi;
endif

970 971
# prepare2 creates a makefile if using a separate output directory
prepare2: prepare3 outputmakefile
Linus Torvalds's avatar
Linus Torvalds committed
972

973
prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
Sam Ravnborg's avatar
Sam Ravnborg committed
974
                   include/config/auto.conf
Sam Ravnborg's avatar
Sam Ravnborg committed
975
	$(cmd_crmodverdir)
Linus Torvalds's avatar
Linus Torvalds committed
976

977 978 979
archprepare: prepare1 scripts_basic

prepare0: archprepare FORCE
980
	$(Q)$(MAKE) $(build)=.
981
	$(Q)$(MAKE) $(build)=. missing-syscalls
982

Linus Torvalds's avatar
Linus Torvalds committed
983
# All the preparing..
984
prepare: prepare0
Linus Torvalds's avatar
Linus Torvalds committed
985 986 987 988 989 990 991 992

# 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
Sam Ravnborg's avatar
Sam Ravnborg committed
993 994 995 996 997 998 999
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
1000 1001

define filechk_version.h
Sam Ravnborg's avatar
Sam Ravnborg committed
1002 1003 1004
	(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
1005 1006
endef

Sam Ravnborg's avatar
Sam Ravnborg committed
1007
include/linux/version.h: $(srctree)/Makefile FORCE
Linus Torvalds's avatar
Linus Torvalds committed
1008 1009
	$(call filechk,version.h)

1010
include/generated/utsrelease.h: include/config/kernel.release FORCE
Sam Ravnborg's avatar
Sam Ravnborg committed
1011 1012
	$(call filechk,utsrelease.h)

1013 1014 1015 1016
PHONY += headerdep
headerdep:
	$(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl

Linus Torvalds's avatar
Linus Torvalds committed
1017 1018
# ---------------------------------------------------------------------------

1019
PHONY += depend dep
Linus Torvalds's avatar
Linus Torvalds committed
1020 1021 1022
depend dep:
	@echo '*** Warning: make $@ is unnecessary now.'

1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
# ---------------------------------------------------------------------------
# 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

1033 1034 1035
# ---------------------------------------------------------------------------
# Kernel headers

1036 1037
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1038

1039
hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1040 1041 1042

# 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)
1043 1044 1045

PHONY += __headers
__headers: include/linux/version.h scripts_basic FORCE
1046
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1047 1048

PHONY += headers_install_all
1049 1050
headers_install_all:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1051

1052
PHONY += headers_install
1053
headers_install: __headers
1054
	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1055
	$(error Headers not exportable for the $(SRCARCH) architecture))
1056
	$(Q)$(MAKE) $(hdr-inst)=include
1057
	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1058

1059 1060
PHONY += headers_check_all
headers_check_all: headers_install_all
1061
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1062

1063 1064
PHONY += headers_check
headers_check: headers_install
1065
	$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1066
	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1067

Linus Torvalds's avatar
Linus Torvalds committed
1068 1069 1070 1071 1072
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

1073
# By default, build modules as well
Linus Torvalds's avatar
Linus Torvalds committed
1074 1075 1076 1077

all: modules

#	Build modules
Tejun Heo's avatar
Tejun Heo committed
1078 1079 1080 1081
#
#	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
1082

1083
PHONY += modules
Linus Torvalds's avatar
Linus Torvalds committed
1084
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
Tejun Heo's avatar
Tejun Heo committed
1085
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1086
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.builtin) > $(objtree)/modules.builtin
1087
	@$(kecho) '  Building modules, stage 2.';
Sam Ravnborg's avatar
Sam Ravnborg committed
1088
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1089
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
Linus Torvalds's avatar
Linus Torvalds committed
1090 1091 1092


# Target to prepare building external modules
1093
PHONY += modules_prepare
1094
modules_prepare: prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
1095 1096

# Target to install modules
1097
PHONY += modules_install
Linus Torvalds's avatar
Linus Torvalds committed
1098 1099
modules_install: _modinst_ _modinst_post

1100
PHONY += _modinst_
Linus Torvalds's avatar
Linus Torvalds committed
1101
_modinst_:
1102
	@if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
Linus Torvalds's avatar
Linus Torvalds committed
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
		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
1115
	@cp -f $(objtree)/modules.order $(MODLIB)/
1116
	@cp -f $(objtree)/modules.builtin $(MODLIB)/
Sam Ravnborg's avatar
Sam Ravnborg committed
1117
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds's avatar
Linus Torvalds committed
1118

1119
# This depmod is only for convenience to give the initial
Linus Torvalds's avatar
Linus Torvalds committed
1120 1121
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1122
PHONY += _modinst_post
Linus Torvalds's avatar
Linus Torvalds committed
1123
_modinst_post: _modinst_
1124
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1125
	$(call cmd,depmod)
Linus Torvalds's avatar
Linus Torvalds committed
1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154

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'
1155
MRPROPER_DIRS  += include/config usr/include include/generated
Sam Ravnborg's avatar
Sam Ravnborg committed
1156
MRPROPER_FILES += .config .config.old .version .old_version             \
1157
                  include/linux/version.h                               \
Wenji Huang's avatar
Wenji Huang committed
1158
		  Module.symvers tags TAGS cscope*
Linus Torvalds's avatar
Linus Torvalds committed
1159 1160 1161 1162 1163

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1164
clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
Linus Torvalds's avatar
Linus Torvalds committed
1165

1166
PHONY += $(clean-dirs) clean archclean
Linus Torvalds's avatar
Linus Torvalds committed
1167 1168 1169 1170 1171 1172 1173
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean: archclean $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
	@find . $(RCS_FIND_IGNORE) \
1174
		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1175
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1176
		-o -name '*.symtypes' -o -name 'modules.order' \
1177
		-o modules.order -o -name '.tmp_*.o.*' \
1178
		-o -name '*.gcno' \) -type f -print | xargs rm -f
Linus Torvalds's avatar
Linus Torvalds committed
1179 1180 1181 1182 1183 1184 1185

# 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)

1186
PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds's avatar
Linus Torvalds committed
1187 1188 1189 1190 1191 1192 1193 1194 1195
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

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

# distclean
#
1196
PHONY += distclean
Linus Torvalds's avatar
Linus Torvalds committed
1197 1198 1199

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
1200
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds's avatar
Linus Torvalds committed
1201
		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1202
		-o -name '.*.rej' -o -size 0 \
Linus Torvalds's avatar
Linus Torvalds committed
1203 1204 1205 1206 1207 1208 1209 1210 1211
		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
		-type f -print | xargs rm -f


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

1212
%pkg: include/config/kernel.release FORCE
1213
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1214
rpm: include/config/kernel.release FORCE
1215
	$(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds's avatar
Linus Torvalds committed
1216 1217 1218 1219 1220


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

1221
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Linus Torvalds's avatar
Linus Torvalds committed
1222
boards := $(notdir $(boards))
1223 1224
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds's avatar
Linus Torvalds committed
1225 1226 1227

help:
	@echo  'Cleaning targets:'
1228
	@echo  '  clean		  - Remove most generated files but keep the config and'
1229
	@echo  '                    enough build support to build external modules'
1230
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1231
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
Linus Torvalds's avatar
Linus Torvalds committed
1232 1233 1234 1235 1236 1237 1238 1239
	@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'
1240
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1241 1242
	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
Linus Torvalds's avatar
Linus Torvalds committed
1243 1244
	@echo  '  dir/            - Build all files in dir and below'
	@echo  '  dir/file.[ois]  - Build specified target only'
1245
	@echo  '  dir/file.ko     - Build module including final link'
1246
	@echo  '  modules_prepare - Set up for building external modules'
Linus Torvalds's avatar
Linus Torvalds committed
1247 1248
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1249
	@echo  '  kernelrelease	  - Output the release version string'
1250
	@echo  '  kernelversion	  - Output the version stored in Makefile'
1251
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1252
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1253
	 echo  ''
Linus Torvalds's avatar
Linus Torvalds committed
1254 1255 1256
	@echo  'Static analysers'
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1257
	@echo  '  versioncheck    - Sanity check on version.h usage'
1258
	@echo  '  includecheck    - Check for duplicate included header files'
1259
	@echo  '  export_report   - List the usages of all exported symbols'
1260 1261
	@echo  '  headers_check   - Sanity check on exported headers'
	@echo  '  headerdep       - Detect inclusion cycles in headers'; \
1262
	 echo  ''
Linus Torvalds's avatar
Linus Torvalds committed
1263
	@echo  'Kernel packaging:'
1264
	@$(MAKE) $(build)=$(package-dir) help
Linus Torvalds's avatar
Linus Torvalds committed
1265 1266 1267 1268
	@echo  ''
	@echo  'Documentation targets:'
	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
	@echo  ''
1269
	@echo  'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds's avatar
Linus Torvalds committed
1270
	@$(if $(archhelp),$(archhelp),\
1271
		echo '  No architecture specific help defined for $(SRCARCH)')
Linus Torvalds's avatar
Linus Torvalds committed
1272 1273 1274 1275 1276
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1277 1278 1279 1280 1281
	@$(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
1282 1283

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1284
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
Linus Torvalds's avatar
Linus Torvalds committed
1285
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1286 1287
	@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
1288 1289 1290 1291 1292
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
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 '')