All new accounts created on Gitlab now require administrator approval. If you invite any collaborators, please let Flux staff know so they can approve the accounts.

Makefile 53.1 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 = 28
Linus Torvalds's avatar
Linus Torvalds committed
4 5
EXTRAVERSION = -rc7
NAME = Erotic Pickled Herring
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 38 39 40 41 42 43 44 45 46

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

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

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

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

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

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


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


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

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

# That's our default target when none is given on the command line
108
PHONY := _all
Linus Torvalds's avatar
Linus Torvalds committed
109 110
_all:

111 112 113
# Cancel implicit rules on top Makefile
$(CURDIR)/Makefile Makefile: ;

Linus Torvalds's avatar
Linus Torvalds committed
114 115 116 117 118 119 120 121
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))

122 123
PHONY += $(MAKECMDGOALS) sub-make

124
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
125 126 127
	$(Q)@:

sub-make: FORCE
128 129
	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
	KBUILD_SRC=$(CURDIR) \
130 131
	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
	$(filter-out _all sub-make,$(MAKECMDGOALS))
Linus Torvalds's avatar
Linus Torvalds committed
132 133 134 135 136 137 138 139 140 141 142

# 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
143
PHONY += all
Linus Torvalds's avatar
Linus Torvalds committed
144 145 146 147 148 149 150 151 152 153 154 155 156
ifeq ($(KBUILD_EXTMOD),)
_all: all
else
_all: modules
endif

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

157
VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds's avatar
Linus Torvalds committed
158 159 160 161 162 163 164 165 166 167 168 169

export srctree objtree VPATH TOPDIR


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

SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
				  -e s/arm.*/arm/ -e s/sa110/arm/ \
170
				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
Paul Mundt's avatar
Paul Mundt committed
171
				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
172
				  -e s/sh.*/sh/ )
Linus Torvalds's avatar
Linus Torvalds committed
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191

# 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
192
export KBUILD_BUILDHOST := $(SUBARCH)
Linus Torvalds's avatar
Linus Torvalds committed
193 194 195 196
ARCH		?= $(SUBARCH)
CROSS_COMPILE	?=

# Architecture as present in compile.h
197 198
UTS_MACHINE 	:= $(ARCH)
SRCARCH 	:= $(ARCH)
Linus Torvalds's avatar
Linus Torvalds committed
199

200 201 202 203 204 205 206
# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
        SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
        SRCARCH := x86
endif
207

208
# Where to locate arch specific headers
209 210 211 212 213
ifeq ($(ARCH),sparc64)
       hdr-arch  := sparc
else
       hdr-arch  := $(SRCARCH)
endif
214

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

Al Viro's avatar
Al Viro committed
323
CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
Linus Torvalds's avatar
Linus Torvalds committed
324 325 326
MODFLAGS	= -DMODULE
CFLAGS_MODULE   = $(MODFLAGS)
AFLAGS_MODULE   = $(MODFLAGS)
327
LDFLAGS_MODULE  =
Linus Torvalds's avatar
Linus Torvalds committed
328 329 330 331 332 333 334
CFLAGS_KERNEL	=
AFLAGS_KERNEL	=


# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
LINUXINCLUDE    := -Iinclude \
335
                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
336 337
                   -I$(srctree)/arch/$(hdr-arch)/include               \
                   -include include/linux/autoconf.h
Linus Torvalds's avatar
Linus Torvalds committed
338

339
KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds's avatar
Linus Torvalds committed
340

341
KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
342 343
		   -fno-strict-aliasing -fno-common \
		   -Werror-implicit-function-declaration
344
KBUILD_AFLAGS   := -D__ASSEMBLY__
Linus Torvalds's avatar
Linus Torvalds committed
345

Roman Zippel's avatar
Roman Zippel committed
346 347
# Read KERNELRELEASE from include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
348
KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
349

350
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
351
export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
352 353
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
354

355
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
356
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
357
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Linus Torvalds's avatar
Linus Torvalds committed
358 359 360 361 362 363 364 365

# 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

366 367
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
368 369 370 371 372

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

# Basic helpers built in scripts/
373
PHONY += scripts_basic
Linus Torvalds's avatar
Linus Torvalds committed
374 375 376
scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic

377 378 379
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

380
PHONY += outputmakefile
381 382 383
# 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
384
outputmakefile:
385 386 387 388
ifneq ($(KBUILD_SRC),)
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif
Linus Torvalds's avatar
Linus Torvalds committed
389 390 391 392 393

# 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.
394
# For example 'make oldconfig all'.
Linus Torvalds's avatar
Linus Torvalds committed
395 396 397
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

398
no-dot-config-targets := clean mrproper distclean \
399
			 cscope TAGS tags help %docs check% \
400 401
			 include/linux/version.h headers_% \
			 kernelrelease kernelversion
Linus Torvalds's avatar
Linus Torvalds committed
402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438

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'
439
include $(srctree)/arch/$(SRCARCH)/Makefile
440
export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds's avatar
Linus Torvalds committed
441

442 443 444 445 446
config: scripts_basic outputmakefile FORCE
	$(Q)mkdir -p include/linux include/config
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

%config: scripts_basic outputmakefile FORCE
447
	$(Q)mkdir -p include/linux include/config
Linus Torvalds's avatar
Linus Torvalds committed
448 449 450 451 452 453 454 455 456 457
	$(Q)$(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
458
# in parallel
459
PHONY += scripts
460
scripts: scripts_basic include/config/auto.conf
Linus Torvalds's avatar
Linus Torvalds committed
461 462 463 464
	$(Q)$(MAKE) $(build)=$(@)

# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
465
drivers-y	:= drivers/ sound/ firmware/
Linus Torvalds's avatar
Linus Torvalds committed
466 467 468 469 470 471
net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
472 473
# Read in config
-include include/config/auto.conf
Linus Torvalds's avatar
Linus Torvalds committed
474

475
ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds's avatar
Linus Torvalds committed
476 477
# Read in dependencies to all Kconfig* files, make sure to run
# oldconfig if changes are detected.
478
-include include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
479 480

# To avoid any implicit rule to kick in, define an empty command
481
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds's avatar
Linus Torvalds committed
482

483
# If .config is newer than include/config/auto.conf, someone tinkered
484
# with it and forgot to run make oldconfig.
485
# if auto.conf.cmd is missing then we are probably in a cleaned tree so
486
# we execute the config step to be sure to catch updated Kconfig files
487
include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
488
	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
489
else
490 491 492 493 494 495 496 497 498 499 500 501 502 503
# 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
504

Linus Torvalds's avatar
Linus Torvalds committed
505 506
else
# Dummy target needed, because used as prerequisite
507
include/config/auto.conf: ;
508
endif # $(dot-config)
Linus Torvalds's avatar
Linus Torvalds committed
509 510 511 512

# 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
513
# Defaults vmlinux but it is usually overridden in the arch makefile
Linus Torvalds's avatar
Linus Torvalds committed
514 515 516
all: vmlinux

ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
517
KBUILD_CFLAGS	+= -Os
Linus Torvalds's avatar
Linus Torvalds committed
518
else
519
KBUILD_CFLAGS	+= -O2
Linus Torvalds's avatar
Linus Torvalds committed
520 521
endif

Ralf Baechle's avatar
Ralf Baechle committed
522 523
include $(srctree)/arch/$(SRCARCH)/Makefile

524 525 526 527
ifneq (CONFIG_FRAME_WARN,0)
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

528 529 530 531
# Force gcc to behave correct even for buggy distributions
# Arch Makefiles may override this setting
KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)

Linus Torvalds's avatar
Linus Torvalds committed
532
ifdef CONFIG_FRAME_POINTER
533
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds's avatar
Linus Torvalds committed
534
else
535
KBUILD_CFLAGS	+= -fomit-frame-pointer
Linus Torvalds's avatar
Linus Torvalds committed
536 537 538
endif

ifdef CONFIG_DEBUG_INFO
539
KBUILD_CFLAGS	+= -g
540
KBUILD_AFLAGS	+= -gdwarf-2
Linus Torvalds's avatar
Linus Torvalds committed
541 542
endif

543
ifdef CONFIG_FUNCTION_TRACER
544 545 546
KBUILD_CFLAGS	+= -pg
endif

547 548 549 550 551
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

552
# arch Makefile may override CC so keep this after arch Makefile is included
553
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
554 555
CHECKFLAGS     += $(NOSTDINC_FLAGS)

Linus Torvalds's avatar
Linus Torvalds committed
556
# warn about C99 declaration after statement
557
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds's avatar
Linus Torvalds committed
558

559
# disable pointer signed / unsigned warnings in gcc 4.0
560
KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
Linus Torvalds's avatar
Linus Torvalds committed
561

562
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578
# 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
579

Roland McGrath's avatar
Roland McGrath committed
580 581 582 583 584 585
# 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)

Linus Torvalds's avatar
Linus Torvalds committed
586
# Default kernel image to build when no specific target is given.
587
# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds's avatar
Linus Torvalds committed
588 589 590 591 592 593 594 595 596 597 598 599 600
# 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
601
# makefile but the argument can be passed to make if needed.
Linus Torvalds's avatar
Linus Torvalds committed
602 603
#

604
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds's avatar
Linus Torvalds committed
605 606
export MODLIB

607
#
608 609 610 611
# INSTALL_MOD_STRIP, if defined, will cause modules to be stripped while
# they get installed.  If INSTALL_MOD_STRIP is '1', then the default
# options (see below) will be used.  Otherwise, INSTALL_MOD_STRIP will
# be used as the option(s) to the objcopy command.
612 613
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
614 615
mod_strip_cmd = $(OBJCOPY) --strip-debug --strip-symbols \
		$(srctree)/scripts/strip-symbols --wildcard
616
else
617
mod_strip_cmd = $(OBJCOPY) $(INSTALL_MOD_STRIP)
618 619
endif # INSTALL_MOD_STRIP=1
else
620
mod_strip_cmd = false
621 622 623
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

Linus Torvalds's avatar
Linus Torvalds committed
624 625

ifeq ($(KBUILD_EXTMOD),)
626
core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds's avatar
Linus Torvalds committed
627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646

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
# ---------------------------------------------------------------------------
647
# vmlinux is built from the objects selected by $(vmlinux-init) and
Linus Torvalds's avatar
Linus Torvalds committed
648
# $(vmlinux-main). Most are built-in.o files from top-level directories
649
# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
Linus Torvalds's avatar
Linus Torvalds committed
650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674
# 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) $(vmlinux-main)
675
vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
676
export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
Linus Torvalds's avatar
Linus Torvalds committed
677 678 679 680 681 682 683

# 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                  \
684
      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
Linus Torvalds's avatar
Linus Torvalds committed
685 686 687 688

# Generate new vmlinux version
quiet_cmd_vmlinux_version = GEN     .version
      cmd_vmlinux_version = set -e;                     \
689 690 691 692 693 694 695
	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
696 697 698
	$(MAKE) $(build)=init

# Generate System.map
699
quiet_cmd_sysmap = SYSMAP
Linus Torvalds's avatar
Linus Torvalds committed
700 701 702 703 704
      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
705 706
# 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
707
define rule_vmlinux__
708
	:
Linus Torvalds's avatar
Linus Torvalds committed
709 710 711 712 713
	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))

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

714 715 716 717 718 719
	$(Q)$(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
720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751
	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
752 753
	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
	  echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
Linus Torvalds's avatar
Linus Torvalds committed
754
	  $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
755 756 757
	$(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
758 759 760 761 762
		 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
763
# First command is ':' to allow us to use + in front of this rule
Linus Torvalds's avatar
Linus Torvalds committed
764 765
cmd_ksym_ld = $(cmd_vmlinux__)
define rule_ksym_ld
Sam Ravnborg's avatar
Sam Ravnborg committed
766
	: 
Linus Torvalds's avatar
Linus Torvalds committed
767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795
	+$(call cmd,vmlinux_version)
	$(call cmd,vmlinux__)
	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
endef

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

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

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

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

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

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

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

796 797 798 799 800 801 802 803 804 805
# 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
806 807
endif # ifdef CONFIG_KALLSYMS

808 809 810 811 812
# 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
813
	 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
814 815 816 817 818 819 820
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
821
# vmlinux image - including updated kernel symbols
822
vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
823
ifdef CONFIG_HEADERS_CHECK
824
	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
825 826 827
endif
ifdef CONFIG_SAMPLES
	$(Q)$(MAKE) $(build)=samples
828 829 830
endif
ifdef CONFIG_BUILD_DOCSRC
	$(Q)$(MAKE) $(build)=Documentation
831
endif
832
	$(call vmlinux-modpost)
Linus Torvalds's avatar
Linus Torvalds committed
833
	$(call if_changed_rule,vmlinux__)
834
	$(Q)rm -f .old_version
Linus Torvalds's avatar
Linus Torvalds committed
835

836
# build vmlinux.o first to catch section mismatch errors early
Sam Ravnborg's avatar
Sam Ravnborg committed
837 838 839
ifdef CONFIG_KALLSYMS
.tmp_vmlinux1: vmlinux.o
endif
Sam Ravnborg's avatar
Sam Ravnborg committed
840 841 842

modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
843 844
	$(call if_changed_rule,vmlinux-modpost)

Linus Torvalds's avatar
Linus Torvalds committed
845 846 847 848 849 850 851 852 853 854
# 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

855
PHONY += $(vmlinux-dirs)
856
$(vmlinux-dirs): prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
857 858
	$(Q)$(MAKE) $(build)=$@

859 860
# Build the kernel release string
#
861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877
# 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)
878
#	    localversion*		(files without backups, containing '~')
879 880 881 882 883 884 885 886 887
#	    $(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.
888

889 890
pattern = ".*/localversion[^~]*"
string  = $(shell cat /dev/null \
891
	   `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
892

893 894
localver = $(subst $(space),, $(string) \
			      $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
895

896 897
# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
# and if the SCM is know a tag from the SCM is appended.
898
# The appended tag is determined by the SCM used.
899 900 901 902 903 904 905 906 907 908 909 910
#
# Currently, only git is supported.
# Other SCMs can edit scripts/setlocalversion and add the appropriate
# checks as needed.
ifdef CONFIG_LOCALVERSION_AUTO
	_localver-auto = $(shell $(CONFIG_SHELL) \
	                  $(srctree)/scripts/setlocalversion $(srctree))
	localver-auto  = $(LOCALVERSION)$(_localver-auto)
endif

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

Roman Zippel's avatar
Roman Zippel committed
911
# Store (new) KERNELRELASE string in include/config/kernel.release
912
kernelrelease = $(KERNELVERSION)$(localver-full)
Roman Zippel's avatar
Roman Zippel committed
913
include/config/kernel.release: include/config/auto.conf FORCE
914 915
	$(Q)rm -f $@
	$(Q)echo $(kernelrelease) > $@
916 917


Linus Torvalds's avatar
Linus Torvalds committed
918
# Things we need to do before we recursively start building the kernel
919 920 921 922
# 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
923

924
# Listed in dependency order
925
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
926

927
# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds's avatar
Linus Torvalds committed
928 929 930
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
# 2) Create the include2 directory, used for the second asm symlink
Roman Zippel's avatar
Roman Zippel committed
931
prepare3: include/config/kernel.release
Linus Torvalds's avatar
Linus Torvalds committed
932
ifneq ($(KBUILD_SRC),)
933
	@$(kecho) '  Using $(srctree) as source for kernel'
934
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Linus Torvalds's avatar
Linus Torvalds committed
935 936 937 938
		echo "  $(srctree) is not clean, please run 'make mrproper'";\
		echo "  in the '$(srctree)' directory.";\
		/bin/false; \
	fi;
Sam Ravnborg's avatar
Sam Ravnborg committed
939 940
	$(Q)if [ ! -d include2 ]; then                                  \
	    mkdir -p include2;                                          \
941
	    ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
Sam Ravnborg's avatar
Sam Ravnborg committed
942
	fi
Linus Torvalds's avatar
Linus Torvalds committed
943 944
endif

945 946
# prepare2 creates a makefile if using a separate output directory
prepare2: prepare3 outputmakefile
Linus Torvalds's avatar
Linus Torvalds committed
947

948 949
prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
                   include/asm include/config/auto.conf
Sam Ravnborg's avatar
Sam Ravnborg committed
950
	$(cmd_crmodverdir)
Linus Torvalds's avatar
Linus Torvalds committed
951

952 953 954
archprepare: prepare1 scripts_basic

prepare0: archprepare FORCE
955
	$(Q)$(MAKE) $(build)=.
956
	$(Q)$(MAKE) $(build)=. missing-syscalls
957

Linus Torvalds's avatar
Linus Torvalds committed
958
# All the preparing..
959
prepare: prepare0
Linus Torvalds's avatar
Linus Torvalds committed
960

961 962
# Leave this as default for preprocessing vmlinux.lds.S, which is now
# done in arch/$(ARCH)/kernel/Makefile
Linus Torvalds's avatar
Linus Torvalds committed
963 964 965

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

966 967
# The asm symlink changes when $(ARCH) changes.
# Detect this and ask user to run make mrproper
Sam Ravnborg's avatar
Sam Ravnborg committed
968
# If asm is a stale symlink (point to dir that does not exist) remove it
969 970 971 972 973
define check-symlink
	set -e;                                                            \
	if [ -L include/asm ]; then                                        \
		asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
		if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
974 975
			echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
			echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
976 977
			exit 1;                                            \
		fi;                                                        \
Sam Ravnborg's avatar
Sam Ravnborg committed
978 979 980 981
		test -e $$asmlink || rm include/asm;                       \
	elif [ -d include/asm ]; then                                      \
		echo "ERROR: $@ is a directory but a symlink was expected";\
		exit 1;                                                    \
982
	fi
983 984 985 986 987 988 989
endef

# We create the target directory of the symlink if it does
# not exist so the test in chack-symlink works and we have a
# directory for generated filesas used by some architectures.
define create-symlink
	if [ ! -L include/asm ]; then                                      \
990
			$(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
991 992 993 994
			if [ ! -d include/asm-$(SRCARCH) ]; then           \
				mkdir -p include/asm-$(SRCARCH);           \
			fi;                                                \
			ln -fsn asm-$(SRCARCH) $@;                         \
995
	fi
996 997 998 999 1000
endef

include/asm: FORCE
	$(Q)$(check-symlink)
	$(Q)$(create-symlink)
Linus Torvalds's avatar
Linus Torvalds committed
1001 1002 1003 1004 1005 1006 1007 1008

# 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
1009 1010 1011 1012 1013 1014 1015
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
1016 1017

define filechk_version.h
Sam Ravnborg's avatar
Sam Ravnborg committed
1018 1019 1020
	(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
1021 1022
endef

Sam Ravnborg's avatar
Sam Ravnborg committed
1023
include/linux/version.h: $(srctree)/Makefile FORCE
Linus Torvalds's avatar
Linus Torvalds committed
1024 1025
	$(call filechk,version.h)

Sam Ravnborg's avatar
Sam Ravnborg committed
1026 1027 1028
include/linux/utsrelease.h: include/config/kernel.release FORCE
	$(call filechk,utsrelease.h)

1029 1030 1031 1032
PHONY += headerdep
headerdep:
	$(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl

Linus Torvalds's avatar
Linus Torvalds committed
1033 1034
# ---------------------------------------------------------------------------

1035
PHONY += depend dep
Linus Torvalds's avatar
Linus Torvalds committed
1036 1037 1038
depend dep:
	@echo '*** Warning: make $@ is unnecessary now.'

1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
# ---------------------------------------------------------------------------
# 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

1049 1050 1051
# ---------------------------------------------------------------------------
# Kernel headers

1052 1053
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1054

1055
hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1056 1057 1058 1059 1060 1061 1062 1063
# Find out where the Kbuild file is located to support
# arch/$(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)
1064 1065 1066

PHONY += __headers
__headers: include/linux/version.h scripts_basic FORCE
1067
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1068 1069

PHONY += headers_install_all
1070 1071
headers_install_all:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1072

1073
PHONY += headers_install
1074
headers_install: __headers
1075 1076
	$(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
	$(error Headers not exportable for the $(SRCARCH) architecture))
1077
	$(Q)$(MAKE) $(hdr-inst)=include
1078
	$(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1079

1080 1081
PHONY += headers_check_all
headers_check_all: headers_install_all
1082
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1083

1084 1085
PHONY += headers_check
headers_check: headers_install
1086
	$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1087
	$(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1088

Linus Torvalds's avatar
Linus Torvalds committed
1089 1090 1091 1092 1093
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

1094
# By default, build modules as well
Linus Torvalds's avatar
Linus Torvalds committed
1095 1096 1097 1098

all: modules

#	Build modules
Tejun Heo's avatar
Tejun Heo committed
1099 1100 1101 1102
#
#	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
1103

1104
PHONY += modules
Linus Torvalds's avatar
Linus Torvalds committed
1105
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
Tejun Heo's avatar
Tejun Heo committed
1106
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1107
	@$(kecho) '  Building modules, stage 2.';
Sam Ravnborg's avatar
Sam Ravnborg committed
1108
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1109
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
Linus Torvalds's avatar
Linus Torvalds committed
1110 1111 1112


# Target to prepare building external modules
1113
PHONY += modules_prepare
1114
modules_prepare: prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
1115 1116

# Target to install modules
1117
PHONY += modules_install
Linus Torvalds's avatar
Linus Torvalds committed
1118 1119
modules_install: _modinst_ _modinst_post

1120
PHONY += _modinst_
Linus Torvalds's avatar
Linus Torvalds committed
1121
_modinst_:
1122
	@if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
Linus Torvalds's avatar
Linus Torvalds committed
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
		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
1135
	@cp -f $(objtree)/modules.order $(MODLIB)/
Sam Ravnborg's avatar
Sam Ravnborg committed
1136
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds's avatar
Linus Torvalds committed
1137

1138
# This depmod is only for convenience to give the initial
Linus Torvalds's avatar
Linus Torvalds committed
1139 1140
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1141
PHONY += _modinst_post
Linus Torvalds's avatar
Linus Torvalds committed
1142
_modinst_post: _modinst_
1143
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1144
	$(call cmd,depmod)
Linus Torvalds's avatar
Linus Torvalds committed
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173

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'
1174
MRPROPER_DIRS  += include/config include2 usr/include
1175
MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1176 1177
                  include/linux/autoconf.h include/linux/version.h      \
                  include/linux/utsrelease.h                            \
1178
                  include/linux/bounds.h include/asm*/asm-offsets.h     \
1179
		  Module.symvers Module.markers tags TAGS cscope*
Linus Torvalds's avatar
Linus Torvalds committed
1180 1181 1182 1183 1184

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1185
clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
Linus Torvalds's avatar
Linus Torvalds committed
1186

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

clean: archclean $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
	@find . $(RCS_FIND_IGNORE) \
1195
		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1196
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1197
		-o -name '*.symtypes' -o -name 'modules.order' \
1198
		-o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
Linus Torvalds's avatar
Linus Torvalds committed
1199 1200 1201 1202 1203 1204 1205 1206
		-type f -print | xargs rm -f

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

1207
PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds's avatar
Linus Torvalds committed
1208 1209 1210 1211 1212 1213 1214 1215 1216
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

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

# distclean
#
1217
PHONY += distclean
Linus Torvalds's avatar
Linus Torvalds committed
1218 1219 1220

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
1221
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds's avatar
Linus Torvalds committed
1222
		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1223
		-o -name '.*.rej' -o -size 0 \
Linus Torvalds's avatar
Linus Torvalds committed
1224 1225 1226 1227 1228 1229 1230 1231 1232
		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
		-type f -print | xargs rm -f


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

1233
%pkg: include/config/kernel.release FORCE
1234
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1235
rpm: include/config/kernel.release FORCE
1236
	$(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds's avatar
Linus Torvalds committed
1237 1238 1239 1240 1241


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

1242
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Linus Torvalds's avatar
Linus Torvalds committed
1243
boards := $(notdir $(boards))
1244 1245
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds's avatar
Linus Torvalds committed
1246 1247 1248

help:
	@echo  'Cleaning targets:'
1249
	@echo  '  clean		  - Remove most generated files but keep the config and'
1250
	@echo  '                    enough build support to build external modules'
1251
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1252
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
Linus Torvalds's avatar
Linus Torvalds committed
1253 1254 1255 1256 1257 1258 1259 1260
	@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'
Bodo Eggert's avatar