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 54.1 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
EXTRAVERSION =
Linus Torvalds's avatar
Linus Torvalds committed
5
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

Sam Ravnborg's avatar
Sam Ravnborg committed
208
# Additional ARCH settings for sparc
209
ifeq ($(ARCH),sparc64)
Sam Ravnborg's avatar
Sam Ravnborg committed
210
       SRCARCH := sparc
211
endif
212

Sam Ravnborg's avatar
Sam Ravnborg committed
213 214 215
# Where to locate arch specific headers
hdr-arch  := $(SRCARCH)

216 217
KCONFIG_CONFIG	?= .config

Linus Torvalds's avatar
Linus Torvalds committed
218 219 220 221 222
# 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)

223 224 225 226
HOSTCC       = gcc
HOSTCXX      = g++
HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
HOSTCXXFLAGS = -O2
Linus Torvalds's avatar
Linus Torvalds committed
227

228 229
# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.
Linus Torvalds's avatar
Linus Torvalds committed
230 231 232 233 234 235 236

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
237
#	make sure the checksums are up to date before we record them.
Linus Torvalds's avatar
Linus Torvalds committed
238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254

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

255
export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds's avatar
Linus Torvalds committed
256 257 258 259 260 261 262 263 264 265 266 267 268 269
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. 
270
# If it is set to "silent_", nothing will be printed at all, since
Linus Torvalds's avatar
Linus Torvalds committed
271 272
# the variable $(silent_cmd_cc_o_c) doesn't exist.
#
Adrian Bunk's avatar
Adrian Bunk committed
273
# A simple variant is to prefix commands with $(Q) - that's useful
Linus Torvalds's avatar
Linus Torvalds committed
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301
# 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)

302 303
# We need some generic definitions (do not try to remake the file).
$(srctree)/scripts/Kbuild.include: ;
304
include $(srctree)/scripts/Kbuild.include
Linus Torvalds's avatar
Linus Torvalds committed
305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323

# 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
324
CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
Linus Torvalds's avatar
Linus Torvalds committed
325 326 327
MODFLAGS	= -DMODULE
CFLAGS_MODULE   = $(MODFLAGS)
AFLAGS_MODULE   = $(MODFLAGS)
328
LDFLAGS_MODULE  =
Linus Torvalds's avatar
Linus Torvalds committed
329 330 331 332 333 334 335
CFLAGS_KERNEL	=
AFLAGS_KERNEL	=


# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
LINUXINCLUDE    := -Iinclude \
336
                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
337 338
                   -I$(srctree)/arch/$(hdr-arch)/include               \
                   -include include/linux/autoconf.h
Linus Torvalds's avatar
Linus Torvalds committed
339

340
KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds's avatar
Linus Torvalds committed
341

342
KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
343 344
		   -fno-strict-aliasing -fno-common \
		   -Werror-implicit-function-declaration
345
KBUILD_AFLAGS   := -D__ASSEMBLY__
Linus Torvalds's avatar
Linus Torvalds committed
346

Roman Zippel's avatar
Roman Zippel committed
347 348
# Read KERNELRELEASE from include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
349
KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
350

351
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
352
export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
353 354
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
355

356
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
357
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
358
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Linus Torvalds's avatar
Linus Torvalds committed
359 360 361 362 363 364 365 366

# 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

367 368
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
369 370 371 372 373

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

# Basic helpers built in scripts/
374
PHONY += scripts_basic
Linus Torvalds's avatar
Linus Torvalds committed
375 376 377
scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic

378 379 380
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

381
PHONY += outputmakefile
382 383 384
# 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
385
outputmakefile:
386 387 388 389
ifneq ($(KBUILD_SRC),)
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif
Linus Torvalds's avatar
Linus Torvalds committed
390 391 392 393 394

# 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.
395
# For example 'make oldconfig all'.
Linus Torvalds's avatar
Linus Torvalds committed
396 397 398
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

399
no-dot-config-targets := clean mrproper distclean \
400
			 cscope TAGS tags help %docs check% \
401 402
			 include/linux/version.h headers_% \
			 kernelrelease kernelversion
Linus Torvalds's avatar
Linus Torvalds committed
403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439

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'
440
include $(srctree)/arch/$(SRCARCH)/Makefile
441
export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds's avatar
Linus Torvalds committed
442

443 444 445 446 447
config: scripts_basic outputmakefile FORCE
	$(Q)mkdir -p include/linux include/config
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

%config: scripts_basic outputmakefile FORCE
448
	$(Q)mkdir -p include/linux include/config
Linus Torvalds's avatar
Linus Torvalds committed
449 450 451 452 453 454 455 456 457 458
	$(Q)$(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
459
# in parallel
460
PHONY += scripts
461
scripts: scripts_basic include/config/auto.conf
Linus Torvalds's avatar
Linus Torvalds committed
462 463 464 465
	$(Q)$(MAKE) $(build)=$(@)

# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
466
drivers-y	:= drivers/ sound/ firmware/
Linus Torvalds's avatar
Linus Torvalds committed
467 468 469 470 471 472
net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
473 474
# Read in config
-include include/config/auto.conf
Linus Torvalds's avatar
Linus Torvalds committed
475

476
ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds's avatar
Linus Torvalds committed
477 478
# Read in dependencies to all Kconfig* files, make sure to run
# oldconfig if changes are detected.
479
-include include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
480 481

# To avoid any implicit rule to kick in, define an empty command
482
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds's avatar
Linus Torvalds committed
483

484
# If .config is newer than include/config/auto.conf, someone tinkered
485
# with it and forgot to run make oldconfig.
486
# if auto.conf.cmd is missing then we are probably in a cleaned tree so
487
# we execute the config step to be sure to catch updated Kconfig files
488
include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
489
	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
490
else
491 492 493 494 495 496 497 498 499 500 501 502 503 504
# 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
505

Linus Torvalds's avatar
Linus Torvalds committed
506 507
else
# Dummy target needed, because used as prerequisite
508
include/config/auto.conf: ;
509
endif # $(dot-config)
Linus Torvalds's avatar
Linus Torvalds committed
510 511 512 513

# 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
514
# Defaults vmlinux but it is usually overridden in the arch makefile
Linus Torvalds's avatar
Linus Torvalds committed
515 516 517
all: vmlinux

ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
518
KBUILD_CFLAGS	+= -Os
Linus Torvalds's avatar
Linus Torvalds committed
519
else
520
KBUILD_CFLAGS	+= -O2
Linus Torvalds's avatar
Linus Torvalds committed
521 522
endif

Ralf Baechle's avatar
Ralf Baechle committed
523 524
include $(srctree)/arch/$(SRCARCH)/Makefile

525 526 527 528
ifneq (CONFIG_FRAME_WARN,0)
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

529 530 531 532
# 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
533
ifdef CONFIG_FRAME_POINTER
534
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds's avatar
Linus Torvalds committed
535
else
536
KBUILD_CFLAGS	+= -fomit-frame-pointer
Linus Torvalds's avatar
Linus Torvalds committed
537 538 539
endif

ifdef CONFIG_DEBUG_INFO
540
KBUILD_CFLAGS	+= -g
541
KBUILD_AFLAGS	+= -gdwarf-2
Linus Torvalds's avatar
Linus Torvalds committed
542 543
endif

544
ifdef CONFIG_FUNCTION_TRACER
545 546 547
KBUILD_CFLAGS	+= -pg
endif

548 549 550 551 552
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

553
# arch Makefile may override CC so keep this after arch Makefile is included
554
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
555 556
CHECKFLAGS     += $(NOSTDINC_FLAGS)

Linus Torvalds's avatar
Linus Torvalds committed
557
# warn about C99 declaration after statement
558
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds's avatar
Linus Torvalds committed
559

560
# disable pointer signed / unsigned warnings in gcc 4.0
561
KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
Linus Torvalds's avatar
Linus Torvalds committed
562

563
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579
# 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
580

Roland McGrath's avatar
Roland McGrath committed
581 582 583 584 585 586
# 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
587
# Default kernel image to build when no specific target is given.
588
# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds's avatar
Linus Torvalds committed
589 590 591 592 593 594 595 596 597 598 599 600 601
# 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
602
# makefile but the argument can be passed to make if needed.
Linus Torvalds's avatar
Linus Torvalds committed
603 604
#

605
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds's avatar
Linus Torvalds committed
606 607
export MODLIB

608 609
strip-symbols := $(srctree)/scripts/strip-symbols \
		 $(wildcard $(srctree)/arch/$(ARCH)/scripts/strip-symbols)
610 611

#
612 613 614 615
# 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.
616 617
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
618 619 620 621
mod_strip_cmd = $(OBJCOPY) --strip-debug
ifeq ($(CONFIG_KALLSYMS_ALL),$(CONFIG_KALLSYMS_STRIP_GENERATED))
mod_strip_cmd += --wildcard $(addprefix --strip-symbols ,$(strip-symbols))
endif
622
else
623
mod_strip_cmd = $(OBJCOPY) $(INSTALL_MOD_STRIP)
624 625
endif # INSTALL_MOD_STRIP=1
else
626
mod_strip_cmd = false
627 628 629
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

Linus Torvalds's avatar
Linus Torvalds committed
630 631

ifeq ($(KBUILD_EXTMOD),)
632
core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds's avatar
Linus Torvalds committed
633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652

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
# ---------------------------------------------------------------------------
653
# vmlinux is built from the objects selected by $(vmlinux-init) and
Linus Torvalds's avatar
Linus Torvalds committed
654
# $(vmlinux-main). Most are built-in.o files from top-level directories
655
# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
Linus Torvalds's avatar
Linus Torvalds committed
656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680
# 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) $(vmlinux-main)
681
vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
682
export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
Linus Torvalds's avatar
Linus Torvalds committed
683 684 685 686 687 688 689

# 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                  \
690
      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
Linus Torvalds's avatar
Linus Torvalds committed
691 692 693 694

# Generate new vmlinux version
quiet_cmd_vmlinux_version = GEN     .version
      cmd_vmlinux_version = set -e;                     \
695 696 697 698 699 700 701
	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
702 703 704
	$(MAKE) $(build)=init

# Generate System.map
705
quiet_cmd_sysmap = SYSMAP
Linus Torvalds's avatar
Linus Torvalds committed
706 707 708 709 710
      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
711 712
# 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
713
define rule_vmlinux__
714
	:
Linus Torvalds's avatar
Linus Torvalds committed
715 716 717 718 719
	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))

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

720 721 722 723 724 725
	$(Q)$(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
726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
	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
756
kallsyms.h := $(wildcard include/config/kallsyms/*.h) $(wildcard include/config/kallsyms/*/*.h)
Linus Torvalds's avatar
Linus Torvalds committed
757 758

define verify_kallsyms
759 760
	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
	  echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
Linus Torvalds's avatar
Linus Torvalds committed
761
	  $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
762 763 764
	$(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
765 766 767 768 769
		 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
770
# First command is ':' to allow us to use + in front of this rule
Linus Torvalds's avatar
Linus Torvalds committed
771 772
cmd_ksym_ld = $(cmd_vmlinux__)
define rule_ksym_ld
Sam Ravnborg's avatar
Sam Ravnborg committed
773
	: 
Linus Torvalds's avatar
Linus Torvalds committed
774 775 776 777 778 779 780
	+$(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    $@
781 782
      cmd_kallsyms = { test $* -eq 0 || $(NM) -n $<; } \
		     | $(KALLSYMS) $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) >$@
Linus Torvalds's avatar
Linus Torvalds committed
783

784 785 786 787 788
quiet_cmd_kstrip = STRIP   $@
      cmd_kstrip = $(OBJCOPY) --wildcard $(addprefix --strip$(if $(CONFIG_RELOCATABLE),-unneeded)-symbols ,$(filter %/scripts/strip-symbols,$^)) $< $@

$(foreach n,0 1 2 3,.tmp_kallsyms$(n).o): KBUILD_AFLAGS += -Wa,--strip-local-absolute
$(foreach n,0 1 2 3,.tmp_kallsyms$(n).o): %.o: %.S scripts FORCE
Linus Torvalds's avatar
Linus Torvalds committed
789 790
	$(call if_changed_dep,as_o_S)

791 792 793 794 795
ifeq ($(CONFIG_KALLSYMS_STRIP_GENERATED),y)
strip-ext := .stripped
endif

.tmp_kallsyms%.S: .tmp_vmlinux%$(strip-ext) $(KALLSYMS) $(kallsyms.h)
Linus Torvalds's avatar
Linus Torvalds committed
796 797
	$(call cmd,kallsyms)

798 799 800 801 802 803 804 805
# make -jN seems to have problems with intermediate files, see bug #3330.
.SECONDARY: $(foreach n,1 2 3,.tmp_vmlinux$(n).stripped)
.tmp_vmlinux%.stripped: .tmp_vmlinux% $(strip-symbols) $(kallsyms.h)
	$(call cmd,kstrip)

ifneq ($(CONFIG_DEBUG_INFO),y)
.tmp_vmlinux%: LDFLAGS_vmlinux += -S
endif
Linus Torvalds's avatar
Linus Torvalds committed
806
# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
807 808
.tmp_vmlinux%: $(vmlinux-lds) $(vmlinux-all) FORCE
	$(if $(filter 1,$*),$(call if_changed_rule,ksym_ld),$(call if_changed,vmlinux__))
Linus Torvalds's avatar
Linus Torvalds committed
809

810 811
.tmp_vmlinux0$(strip-ext):
	$(Q)echo "placeholder" >$@
Linus Torvalds's avatar
Linus Torvalds committed
812

813 814 815
.tmp_vmlinux1: .tmp_kallsyms0.o
.tmp_vmlinux2: .tmp_kallsyms1.o
.tmp_vmlinux3: .tmp_kallsyms2.o
Linus Torvalds's avatar
Linus Torvalds committed
816 817 818 819

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

820 821 822 823 824 825 826 827 828 829
# 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
830 831
endif # ifdef CONFIG_KALLSYMS

832 833 834 835 836
# 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
837
	 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
838 839 840 841 842 843 844
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
845
# vmlinux image - including updated kernel symbols
846
vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
847
ifdef CONFIG_HEADERS_CHECK
848
	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
849 850 851
endif
ifdef CONFIG_SAMPLES
	$(Q)$(MAKE) $(build)=samples
852 853 854
endif
ifdef CONFIG_BUILD_DOCSRC
	$(Q)$(MAKE) $(build)=Documentation
855
endif
856
	$(call vmlinux-modpost)
Linus Torvalds's avatar
Linus Torvalds committed
857
	$(call if_changed_rule,vmlinux__)
858
	$(Q)rm -f .old_version
Linus Torvalds's avatar
Linus Torvalds committed
859

860
# build vmlinux.o first to catch section mismatch errors early
Sam Ravnborg's avatar
Sam Ravnborg committed
861 862 863
ifdef CONFIG_KALLSYMS
.tmp_vmlinux1: vmlinux.o
endif
Sam Ravnborg's avatar
Sam Ravnborg committed
864 865 866

modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
867 868
	$(call if_changed_rule,vmlinux-modpost)

Linus Torvalds's avatar
Linus Torvalds committed
869 870 871 872 873 874 875 876 877 878
# 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

879
PHONY += $(vmlinux-dirs)
880
$(vmlinux-dirs): prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
881 882
	$(Q)$(MAKE) $(build)=$@

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.
923 924 925 926 927 928 929 930 931 932 933 934
#
# 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
935
# Store (new) KERNELRELASE string in include/config/kernel.release
936
kernelrelease = $(KERNELVERSION)$(localver-full)
Roman Zippel's avatar
Roman Zippel committed
937
include/config/kernel.release: include/config/auto.conf FORCE
938 939
	$(Q)rm -f $@
	$(Q)echo $(kernelrelease) > $@
940 941


Linus Torvalds's avatar
Linus Torvalds committed
942
# Things we need to do before we recursively start building the kernel
943 944 945 946
# 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
947

948
# Listed in dependency order
949
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
950

951
# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds's avatar
Linus Torvalds committed
952 953 954
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
# 2) Create the include2 directory, used for the second asm symlink
Roman Zippel's avatar
Roman Zippel committed
955
prepare3: include/config/kernel.release
Linus Torvalds's avatar
Linus Torvalds committed
956
ifneq ($(KBUILD_SRC),)
957
	@$(kecho) '  Using $(srctree) as source for kernel'
958
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Linus Torvalds's avatar
Linus Torvalds committed
959 960 961 962
		echo "  $(srctree) is not clean, please run 'make mrproper'";\
		echo "  in the '$(srctree)' directory.";\
		/bin/false; \
	fi;
Sam Ravnborg's avatar
Sam Ravnborg committed
963 964
	$(Q)if [ ! -d include2 ]; then                                  \
	    mkdir -p include2;                                          \
965
	    ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
Sam Ravnborg's avatar
Sam Ravnborg committed
966
	fi
Linus Torvalds's avatar
Linus Torvalds committed
967 968
endif

969 970
# prepare2 creates a makefile if using a separate output directory
prepare2: prepare3 outputmakefile
Linus Torvalds's avatar
Linus Torvalds committed
971

972 973
prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
                   include/asm include/config/auto.conf
Sam Ravnborg's avatar
Sam Ravnborg committed
974
	$(cmd_crmodverdir)
Linus Torvalds's avatar
Linus Torvalds committed
975

976 977 978
archprepare: prepare1 scripts_basic

prepare0: archprepare FORCE
979
	$(Q)$(MAKE) $(build)=.
980
	$(Q)$(MAKE) $(build)=. missing-syscalls
981

Linus Torvalds's avatar
Linus Torvalds committed
982
# All the preparing..
983
prepare: prepare0
Linus Torvalds's avatar
Linus Torvalds committed
984

985 986
# 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
987 988 989

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

990 991
# The asm symlink changes when $(ARCH) changes.
# Detect this and ask user to run make mrproper
Sam Ravnborg's avatar
Sam Ravnborg committed
992
# If asm is a stale symlink (point to dir that does not exist) remove it
993 994 995 996 997
define check-symlink
	set -e;                                                            \
	if [ -L include/asm ]; then                                        \
		asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
		if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
998 999
			echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
			echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
1000 1001
			exit 1;                                            \
		fi;                                                        \
Sam Ravnborg's avatar
Sam Ravnborg committed
1002 1003 1004 1005
		test -e $$asmlink || rm include/asm;                       \
	elif [ -d include/asm ]; then                                      \
		echo "ERROR: $@ is a directory but a symlink was expected";\
		exit 1;                                                    \
1006
	fi
1007 1008 1009 1010 1011 1012 1013
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                                      \
1014
			$(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1015 1016 1017 1018
			if [ ! -d include/asm-$(SRCARCH) ]; then           \
				mkdir -p include/asm-$(SRCARCH);           \
			fi;                                                \
			ln -fsn asm-$(SRCARCH) $@;                         \
1019
	fi
1020 1021 1022 1023 1024
endef

include/asm: FORCE
	$(Q)$(check-symlink)
	$(Q)$(create-symlink)
Linus Torvalds's avatar
Linus Torvalds committed
1025 1026 1027 1028 1029 1030 1031 1032

# 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
1033 1034 1035 1036 1037 1038 1039
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
1040 1041

define filechk_version.h
Sam Ravnborg's avatar
Sam Ravnborg committed
1042 1043 1044
	(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
1045 1046
endef

Sam Ravnborg's avatar
Sam Ravnborg committed
1047
include/linux/version.h: $(srctree)/Makefile FORCE
Linus Torvalds's avatar
Linus Torvalds committed
1048 1049
	$(call filechk,version.h)

Sam Ravnborg's avatar
Sam Ravnborg committed
1050 1051 1052
include/linux/utsrelease.h: include/config/kernel.release FORCE
	$(call filechk,utsrelease.h)

1053 1054 1055 1056
PHONY += headerdep
headerdep:
	$(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl

Linus Torvalds's avatar
Linus Torvalds committed
1057 1058
# ---------------------------------------------------------------------------

1059
PHONY += depend dep
Linus Torvalds's avatar
Linus Torvalds committed
1060 1061 1062
depend dep:
	@echo '*** Warning: make $@ is unnecessary now.'

1063 1064 1065 1066 1067 1068 1069 1070 1071 1072
# ---------------------------------------------------------------------------
# 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

1073 1074 1075
# ---------------------------------------------------------------------------
# Kernel headers

1076 1077
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1078

1079
hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1080 1081 1082 1083 1084 1085 1086 1087
# Find out where the Kbuild file is located to support
# arch/$(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)
1088 1089 1090

PHONY += __headers
__headers: include/linux/version.h scripts_basic FORCE
1091
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1092 1093

PHONY += headers_install_all
1094 1095
headers_install_all:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1096

1097
PHONY += headers_install
1098
headers_install: __headers
1099 1100
	$(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
	$(error Headers not exportable for the $(SRCARCH) architecture))
1101
	$(Q)$(MAKE) $(hdr-inst)=include
1102
	$(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1103

1104 1105
PHONY += headers_check_all
headers_check_all: headers_install_all
1106
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1107

1108 1109
PHONY += headers_check
headers_check: headers_install
1110
	$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1111
	$(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1112

Linus Torvalds's avatar
Linus Torvalds committed
1113 1114 1115 1116 1117
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

1118
# By default, build modules as well
Linus Torvalds's avatar
Linus Torvalds committed
1119 1120 1121 1122

all: modules

#	Build modules
Tejun Heo's avatar
Tejun Heo committed
1123 1124 1125 1126
#
#	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
1127

1128
PHONY += modules
Linus Torvalds's avatar
Linus Torvalds committed
1129
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
Tejun Heo's avatar
Tejun Heo committed
1130
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1131
	@$(kecho) '  Building modules, stage 2.';
Sam Ravnborg's avatar
Sam Ravnborg committed
1132
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1133
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
Linus Torvalds's avatar
Linus Torvalds committed
1134 1135 1136


# Target to prepare building external modules
1137
PHONY += modules_prepare
1138
modules_prepare: prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
1139 1140

# Target to install modules
1141
PHONY += modules_install
Linus Torvalds's avatar
Linus Torvalds committed
1142 1143
modules_install: _modinst_ _modinst_post

1144
PHONY += _modinst_
Linus Torvalds's avatar
Linus Torvalds committed
1145
_modinst_:
1146
	@if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
Linus Torvalds's avatar
Linus Torvalds committed
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
		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
1159
	@cp -f $(objtree)/modules.order $(MODLIB)/
Sam Ravnborg's avatar
Sam Ravnborg committed
1160
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds's avatar
Linus Torvalds committed
1161

1162
# This depmod is only for convenience to give the initial
Linus Torvalds's avatar
Linus Torvalds committed
1163 1164
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1165
PHONY += _modinst_post
Linus Torvalds's avatar
Linus Torvalds committed
1166
_modinst_post: _modinst_
1167
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1168
	$(call cmd,depmod)
Linus Torvalds's avatar
Linus Torvalds committed
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197

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'
1198
MRPROPER_DIRS  += include/config include2 usr/include
1199
MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1200 1201
                  include/linux/autoconf.h include/linux/version.h      \
                  include/linux/utsrelease.h                            \
1202
                  include/linux/bounds.h include/asm*/asm-offsets.h     \
1203
		  Module.symvers Module.markers tags TAGS cscope*
Linus Torvalds's avatar
Linus Torvalds committed
1204 1205 1206 1207 1208

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1209
clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
Linus Torvalds's avatar
Linus Torvalds committed
1210

1211
PHONY += $(clean-dirs) clean archclean
Linus Torvalds's avatar
Linus Torvalds committed
1212 1213 1214 1215 1216 1217 1218
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean: archclean $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
	@find . $(RCS_FIND_IGNORE) \
1219
		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1220
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1221
		-o -name '*.symtypes' -o -name 'modules.order' \
1222
		-o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
Linus Torvalds's avatar
Linus Torvalds committed
1223 1224 1225 1226 1227 1228 1229 1230
		-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)

1231
PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds's avatar
Linus Torvalds committed
1232 1233 1234 1235 1236 1237 1238 1239 1240
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

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

# distclean
#
1241
PHONY += distclean
Linus Torvalds's avatar
Linus Torvalds committed
1242 1243 1244

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
1245
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds's avatar
Linus Torvalds committed
1246
		-o -name '*.bak' -o -name '#*#' -o