Makefile 50.5 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
VERSION = 3
Linus Torvalds's avatar
Linus Torvalds committed
2
PATCHLEVEL = 15
Linus Torvalds's avatar
Linus Torvalds committed
3
SUBLEVEL = 0
Linus Torvalds's avatar
Linus Torvalds committed
4
EXTRAVERSION = -rc1
Linus Torvalds's avatar
Linus Torvalds committed
5
NAME = Shuffling Zombie Juror
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
# Avoid funny character set dependencies
20
unexport LC_ALL
21 22
LC_COLLATE=C
LC_NUMERIC=C
23
export LC_COLLATE LC_NUMERIC
24

25 26 27
# Avoid interference with shell env settings
unexport GREP_OPTIONS

Linus Torvalds's avatar
Linus Torvalds committed
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

47 48
ifeq ("$(origin V)", "command line")
  KBUILD_VERBOSE = $(V)
Linus Torvalds's avatar
Linus Torvalds committed
49 50 51 52 53
endif
ifndef KBUILD_VERBOSE
  KBUILD_VERBOSE = 0
endif

54 55 56 57 58 59 60 61 62
# 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
63

64 65
ifeq ("$(origin C)", "command line")
  KBUILD_CHECKSRC = $(C)
Linus Torvalds's avatar
Linus Torvalds committed
66 67 68 69 70 71 72 73 74 75 76 77
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

78 79 80
ifeq ("$(origin M)", "command line")
  KBUILD_EXTMOD := $(M)
endif
Linus Torvalds's avatar
Linus Torvalds committed
81 82 83 84 85 86

# 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/"
87
#
Linus Torvalds's avatar
Linus Torvalds committed
88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
# 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?
104 105
ifeq ("$(origin O)", "command line")
  KBUILD_OUTPUT := $(O)
Linus Torvalds's avatar
Linus Torvalds committed
106 107 108
endif

# That's our default target when none is given on the command line
109
PHONY := _all
Linus Torvalds's avatar
Linus Torvalds committed
110 111
_all:

112 113 114
# Cancel implicit rules on top Makefile
$(CURDIR)/Makefile Makefile: ;

Linus Torvalds's avatar
Linus Torvalds committed
115 116 117 118
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)
119 120
KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
								&& /bin/pwd)
Linus Torvalds's avatar
Linus Torvalds committed
121
$(if $(KBUILD_OUTPUT),, \
122
     $(error failed to create output directory "$(saved-output)"))
Linus Torvalds's avatar
Linus Torvalds committed
123

124 125
PHONY += $(MAKECMDGOALS) sub-make

126
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
127
	@:
128 129

sub-make: FORCE
130 131
	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
	KBUILD_SRC=$(CURDIR) \
132 133
	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
	$(filter-out _all sub-make,$(MAKECMDGOALS))
Linus Torvalds's avatar
Linus Torvalds committed
134 135 136 137 138 139 140 141 142 143 144

# 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
145
PHONY += all
Linus Torvalds's avatar
Linus Torvalds committed
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))
objtree		:= $(CURDIR)
src		:= $(srctree)
obj		:= $(objtree)

157
VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds's avatar
Linus Torvalds committed
158

159
export srctree objtree VPATH
Linus Torvalds's avatar
Linus Torvalds committed
160 161 162 163 164 165 166 167


# 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.

168 169
SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
				  -e s/sun4u/sparc64/ \
Linus Torvalds's avatar
Linus Torvalds committed
170
				  -e s/arm.*/arm/ -e s/sa110/arm/ \
171
				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
Paul Mundt's avatar
Paul Mundt committed
172
				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
173
				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
Linus Torvalds's avatar
Linus Torvalds committed
174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190

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

# CROSS_COMPILE specify the prefix used for all executables used
# during compilation. Only gcc and related bin-utils executables
# are prefixed with $(CROSS_COMPILE).
# CROSS_COMPILE can be set on the command line
# make CROSS_COMPILE=ia64-linux-
# Alternatively CROSS_COMPILE can be set in the environment.
191 192
# A third alternative is to store a setting in .config so that plain
# "make" in the configured kernel build directory always uses that.
Linus Torvalds's avatar
Linus Torvalds committed
193 194
# Default value for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
195
ARCH		?= $(SUBARCH)
196
CROSS_COMPILE	?= $(CONFIG_CROSS_COMPILE:"%"=%)
Linus Torvalds's avatar
Linus Torvalds committed
197 198

# Architecture as present in compile.h
199 200
UTS_MACHINE 	:= $(ARCH)
SRCARCH 	:= $(ARCH)
Linus Torvalds's avatar
Linus Torvalds committed
201

202 203 204 205 206 207 208
# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
        SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
        SRCARCH := x86
endif
209

Sam Ravnborg's avatar
Sam Ravnborg committed
210
# Additional ARCH settings for sparc
211 212 213
ifeq ($(ARCH),sparc32)
       SRCARCH := sparc
endif
214
ifeq ($(ARCH),sparc64)
Sam Ravnborg's avatar
Sam Ravnborg committed
215
       SRCARCH := sparc
216
endif
217

218 219 220 221 222
# Additional ARCH settings for sh
ifeq ($(ARCH),sh64)
       SRCARCH := sh
endif

223
# Additional ARCH settings for tile
224 225 226
ifeq ($(ARCH),tilepro)
       SRCARCH := tile
endif
227 228 229 230
ifeq ($(ARCH),tilegx)
       SRCARCH := tile
endif

Sam Ravnborg's avatar
Sam Ravnborg committed
231 232 233
# Where to locate arch specific headers
hdr-arch  := $(SRCARCH)

234
KCONFIG_CONFIG	?= .config
235
export KCONFIG_CONFIG
236

Linus Torvalds's avatar
Linus Torvalds committed
237 238 239 240 241
# 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)

242 243
HOSTCC       = gcc
HOSTCXX      = g++
244
HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
245
HOSTCXXFLAGS = -O2
Linus Torvalds's avatar
Linus Torvalds committed
246

247 248 249 250 251
ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
		-Wno-missing-field-initializers -fno-delete-null-pointer-checks
endif

252 253
# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.
Linus Torvalds's avatar
Linus Torvalds committed
254 255 256 257 258 259 260

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
261
#	make sure the checksums are up to date before we record them.
Linus Torvalds's avatar
Linus Torvalds committed
262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278

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

279
export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds's avatar
Linus Torvalds committed
280 281 282 283 284 285 286 287 288 289 290 291 292 293
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. 
294
# If it is set to "silent_", nothing will be printed at all, since
Linus Torvalds's avatar
Linus Torvalds committed
295 296
# the variable $(silent_cmd_cc_o_c) doesn't exist.
#
Adrian Bunk's avatar
Adrian Bunk committed
297
# A simple variant is to prefix commands with $(Q) - that's useful
Linus Torvalds's avatar
Linus Torvalds committed
298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315
# 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

316 317 318 319 320
ifneq ($(filter 4.%,$(MAKE_VERSION)),)	# make-4
ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  quiet=silent_
endif
else					# make-3.8x
321
ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
Linus Torvalds's avatar
Linus Torvalds committed
322 323
  quiet=silent_
endif
324
endif
Linus Torvalds's avatar
Linus Torvalds committed
325 326 327

export quiet Q KBUILD_VERBOSE

328 329 330 331 332 333 334 335
ifneq ($(CC),)
ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
COMPILER := clang
else
COMPILER := gcc
endif
export COMPILER
endif
Linus Torvalds's avatar
Linus Torvalds committed
336 337 338 339

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

340 341
# We need some generic definitions (do not try to remake the file).
$(srctree)/scripts/Kbuild.include: ;
342
include $(srctree)/scripts/Kbuild.include
Linus Torvalds's avatar
Linus Torvalds committed
343 344 345 346 347 348 349 350 351 352 353 354 355 356

# 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
357
INSTALLKERNEL  := installkernel
Linus Torvalds's avatar
Linus Torvalds committed
358 359 360 361
DEPMOD		= /sbin/depmod
PERL		= perl
CHECK		= sparse

362 363
CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
		  -Wbitwise -Wno-return-void $(CF)
364 365 366
CFLAGS_MODULE   =
AFLAGS_MODULE   =
LDFLAGS_MODULE  =
Linus Torvalds's avatar
Linus Torvalds committed
367 368
CFLAGS_KERNEL	=
AFLAGS_KERNEL	=
369
CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage
Linus Torvalds's avatar
Linus Torvalds committed
370 371


372 373 374 375 376 377 378 379
# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE    := \
		-I$(srctree)/arch/$(hdr-arch)/include/uapi \
		-Iarch/$(hdr-arch)/include/generated/uapi \
		-I$(srctree)/include/uapi \
		-Iinclude/generated/uapi \
                -include $(srctree)/include/linux/kconfig.h

Linus Torvalds's avatar
Linus Torvalds committed
380 381
# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
382 383 384 385 386 387
LINUXINCLUDE    := \
		-I$(srctree)/arch/$(hdr-arch)/include \
		-Iarch/$(hdr-arch)/include/generated \
		$(if $(KBUILD_SRC), -I$(srctree)/include) \
		-Iinclude \
		$(USERINCLUDE)
Linus Torvalds's avatar
Linus Torvalds committed
388

389
KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds's avatar
Linus Torvalds committed
390

391
KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
392
		   -fno-strict-aliasing -fno-common \
393
		   -Werror-implicit-function-declaration \
394
		   -Wno-format-security \
395
		   $(call cc-option,-fno-delete-null-pointer-checks,)
396 397
KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
398
KBUILD_AFLAGS   := -D__ASSEMBLY__
399 400 401
KBUILD_AFLAGS_MODULE  := -DMODULE
KBUILD_CFLAGS_MODULE  := -DMODULE
KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Linus Torvalds's avatar
Linus Torvalds committed
402

Roman Zippel's avatar
Roman Zippel committed
403 404
# Read KERNELRELEASE from include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
405
KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
406

407
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
408
export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
409 410
export CPP AR NM STRIP OBJCOPY OBJDUMP
export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
411
export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds's avatar
Linus Torvalds committed
412

413
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
414
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
415
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
416
export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
417
export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
418
export KBUILD_ARFLAGS
Linus Torvalds's avatar
Linus Torvalds committed
419 420 421 422 423 424 425 426

# 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

427 428 429
export 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
430 431
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
432 433 434 435 436

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

# Basic helpers built in scripts/
437
PHONY += scripts_basic
Linus Torvalds's avatar
Linus Torvalds committed
438 439
scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic
440
	$(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds's avatar
Linus Torvalds committed
441

442 443 444
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

445
PHONY += outputmakefile
446 447 448
# 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
449
outputmakefile:
450
ifneq ($(KBUILD_SRC),)
451
	$(Q)ln -fsn $(srctree) source
452 453 454
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif
Linus Torvalds's avatar
Linus Torvalds committed
455

Sam Ravnborg's avatar
Sam Ravnborg committed
456 457 458 459
# Support for using generic headers in asm-generic
PHONY += asm-generic
asm-generic:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
460 461 462
	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
Sam Ravnborg's avatar
Sam Ravnborg committed
463

Linus Torvalds's avatar
Linus Torvalds committed
464 465 466 467
# 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.
468
# For example 'make oldconfig all'.
Linus Torvalds's avatar
Linus Torvalds committed
469 470 471
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

472
version_h := include/generated/uapi/linux/version.h
David Howells's avatar
David Howells committed
473

474
no-dot-config-targets := clean mrproper distclean \
475
			 cscope gtags TAGS tags help %docs check% coccicheck \
David Howells's avatar
David Howells committed
476
			 $(version_h) headers_% archheaders archscripts \
477
			 kernelversion %src-pkg
Linus Torvalds's avatar
Linus Torvalds committed
478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514

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'
515
include $(srctree)/arch/$(SRCARCH)/Makefile
516
export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds's avatar
Linus Torvalds committed
517

518 519 520 521 522
config: scripts_basic outputmakefile FORCE
	$(Q)mkdir -p include/linux include/config
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

%config: scripts_basic outputmakefile FORCE
523
	$(Q)mkdir -p include/linux include/config
Linus Torvalds's avatar
Linus Torvalds committed
524 525 526 527 528 529 530 531 532 533
	$(Q)$(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
534
# in parallel
535
PHONY += scripts
536 537
scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
	 asm-generic
Linus Torvalds's avatar
Linus Torvalds committed
538 539 540 541
	$(Q)$(MAKE) $(build)=$(@)

# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
542
drivers-y	:= drivers/ sound/ firmware/
Linus Torvalds's avatar
Linus Torvalds committed
543 544 545 546 547 548
net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
549 550
# Read in config
-include include/config/auto.conf
Linus Torvalds's avatar
Linus Torvalds committed
551

552
ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds's avatar
Linus Torvalds committed
553 554
# Read in dependencies to all Kconfig* files, make sure to run
# oldconfig if changes are detected.
555
-include include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
556 557

# To avoid any implicit rule to kick in, define an empty command
558
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds's avatar
Linus Torvalds committed
559

560
# If .config is newer than include/config/auto.conf, someone tinkered
561
# with it and forgot to run make oldconfig.
562
# if auto.conf.cmd is missing then we are probably in a cleaned tree so
563
# we execute the config step to be sure to catch updated Kconfig files
564
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
565
	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
566
else
567
# external modules needs include/generated/autoconf.h and include/config/auto.conf
568 569 570 571
# 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:
572
	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
573 574 575 576 577
	echo >&2;							\
	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
	echo >&2 ;							\
578 579 580
	/bin/false)

endif # KBUILD_EXTMOD
581

Linus Torvalds's avatar
Linus Torvalds committed
582 583
else
# Dummy target needed, because used as prerequisite
584
include/config/auto.conf: ;
585
endif # $(dot-config)
Linus Torvalds's avatar
Linus Torvalds committed
586 587 588 589

# 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
Michal Marek's avatar
Michal Marek committed
590
# Defaults to vmlinux, but the arch makefile usually adds further targets
Linus Torvalds's avatar
Linus Torvalds committed
591 592 593
all: vmlinux

ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
594
KBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,)
Linus Torvalds's avatar
Linus Torvalds committed
595
else
596
KBUILD_CFLAGS	+= -O2
Linus Torvalds's avatar
Linus Torvalds committed
597 598
endif

599 600
include $(srctree)/arch/$(SRCARCH)/Makefile

Andi Kleen's avatar
Andi Kleen committed
601 602 603 604 605 606 607 608 609 610
ifdef CONFIG_READABLE_ASM
# Disable optimizations that make assembler listings hard to read.
# reorder blocks reorders the control in the function
# ipa clone creates specialized cloned functions
# partial inlining inlines only parts of functions
KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
                 $(call cc-option,-fno-ipa-cp-clone,) \
                 $(call cc-option,-fno-partial-inlining)
endif

611
ifneq ($(CONFIG_FRAME_WARN),0)
612 613 614
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

615
# Handle stack protector mode.
616
ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
617 618
  stackp-flag := -fstack-protector
  ifeq ($(call cc-option, $(stackp-flag)),)
619
    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
620
             -fstack-protector not supported by compiler)
621
  endif
622 623
else
ifdef CONFIG_CC_STACKPROTECTOR_STRONG
624 625 626 627 628
  stackp-flag := -fstack-protector-strong
  ifeq ($(call cc-option, $(stackp-flag)),)
    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
	      -fstack-protector-strong not supported by compiler)
  endif
629 630 631
else
  # Force off for distro compilers that enable stack protector by default.
  stackp-flag := $(call cc-option, -fno-stack-protector)
632
endif
633
endif
634
KBUILD_CFLAGS += $(stackp-flag)
635

636 637 638 639 640 641 642 643 644 645 646 647 648 649
ifeq ($(COMPILER),clang)
KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
# Quiet clang warning: comparison of unsigned expression < 0 is always false
KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
# source of a reference will be _MergedGlobals and not on of the whitelisted names.
# See modpost pattern 2
KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
else

650 651
# This warning generated too much noise in a regular build.
# Use make W=1 to enable this warning (see scripts/Makefile.build)
652
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
653
endif
654

Linus Torvalds's avatar
Linus Torvalds committed
655
ifdef CONFIG_FRAME_POINTER
656
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds's avatar
Linus Torvalds committed
657
else
658 659 660 661 662 663
# Some targets (ARM with Thumb2, for example), can't be built with frame
# pointers.  For those, we don't have FUNCTION_TRACER automatically
# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
# incompatible with -fomit-frame-pointer with current GCC, so we don't use
# -fomit-frame-pointer with FUNCTION_TRACER.
ifndef CONFIG_FUNCTION_TRACER
664
KBUILD_CFLAGS	+= -fomit-frame-pointer
Linus Torvalds's avatar
Linus Torvalds committed
665
endif
666
endif
Linus Torvalds's avatar
Linus Torvalds committed
667 668

ifdef CONFIG_DEBUG_INFO
669
KBUILD_CFLAGS	+= -g
670
KBUILD_AFLAGS	+= -Wa,--gdwarf-2
Linus Torvalds's avatar
Linus Torvalds committed
671 672
endif

673
ifdef CONFIG_DEBUG_INFO_REDUCED
674 675
KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
		   $(call cc-option,-fno-var-tracking)
676 677
endif

678
ifdef CONFIG_FUNCTION_TRACER
679 680 681 682 683
ifdef CONFIG_HAVE_FENTRY
CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
endif
KBUILD_CFLAGS	+= -pg $(CC_USING_FENTRY)
KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
684
ifdef CONFIG_DYNAMIC_FTRACE
685
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
686 687 688 689
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
690 691
endif

692 693 694 695 696
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

697
# arch Makefile may override CC so keep this after arch Makefile is included
698
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
699 700
CHECKFLAGS     += $(NOSTDINC_FLAGS)

Linus Torvalds's avatar
Linus Torvalds committed
701
# warn about C99 declaration after statement
702
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds's avatar
Linus Torvalds committed
703

704
# disable pointer signed / unsigned warnings in gcc 4.0
705
KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
Linus Torvalds's avatar
Linus Torvalds committed
706

707
# disable invalid "can't wrap" optimizations for signed / pointers
708
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
709

710 711 712
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

713 714 715 716 717 718
# disallow errors like 'EXPORT_GPL(foo);' with missing header
KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)

# require functions to have arguments in prototypes, not empty 'int foo()'
KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)

719 720 721
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

722 723 724
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

725 726 727 728 729
# check for 'asm goto'
ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
endif

730 731
include $(srctree)/scripts/Makefile.extrawarn

732
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
733 734 735
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS += $(KAFLAGS)
KBUILD_CFLAGS += $(KCFLAGS)
736

Roland McGrath's avatar
Roland McGrath committed
737 738
# Use --build-id when available.
LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
739
			      $(call cc-ldoption, -Wl$(comma)--build-id,))
740
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
Roland McGrath's avatar
Roland McGrath committed
741 742
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

743
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
744
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
745 746
endif

Linus Torvalds's avatar
Linus Torvalds committed
747
# Default kernel image to build when no specific target is given.
748
# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds's avatar
Linus Torvalds committed
749 750 751 752 753 754 755 756 757 758
# 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

759 760 761 762 763 764 765
#
# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
# an argument if needed. Otherwise it defaults to the kernel install path
#
export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)

Linus Torvalds's avatar
Linus Torvalds committed
766 767 768
#
# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
# relocations required by build roots.  This is not defined in the
769
# makefile but the argument can be passed to make if needed.
Linus Torvalds's avatar
Linus Torvalds committed
770 771
#

772
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds's avatar
Linus Torvalds committed
773 774
export MODLIB

775
#
776 777 778
#  INSTALL_MOD_STRIP, if defined, will cause modules to be
#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
#  the default option --strip-debug will be used.  Otherwise,
779
#  INSTALL_MOD_STRIP value will be used as the options to the strip command.
780

781 782
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
783
mod_strip_cmd = $(STRIP) --strip-debug
784
else
785
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
786 787
endif # INSTALL_MOD_STRIP=1
else
788
mod_strip_cmd = true
789 790 791
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

792 793 794
# Select initial ramdisk compression format, default is gzip(1).
# This shall be used by the dracut(8) tool while creating an initramfs image.
#
Jan Beulich's avatar
Jan Beulich committed
795 796 797 798 799 800
INITRD_COMPRESS-y                  := gzip
INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
801 802 803
# do not export INITRD_COMPRESS, since we didn't actually
# choose a sane default compression above.
# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
Linus Torvalds's avatar
Linus Torvalds committed
804

805
ifdef CONFIG_MODULE_SIG_ALL
806 807 808
MODSECKEY = ./signing_key.priv
MODPUBKEY = ./signing_key.x509
export MODPUBKEY
809
mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
810 811 812 813 814 815
else
mod_sign_cmd = true
endif
export mod_sign_cmd


Linus Torvalds's avatar
Linus Torvalds committed
816
ifeq ($(KBUILD_EXTMOD),)
817
core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds's avatar
Linus Torvalds committed
818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835

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)

836
# Externally visible symbols (used by link-vmlinux.sh)
837 838 839
export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
840
export LDFLAGS_vmlinux
841 842
# used by scripts/pacmage/Makefile
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
843

844
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
Linus Torvalds's avatar
Linus Torvalds committed
845

846 847 848
# Final link of vmlinux
      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
quiet_cmd_link-vmlinux = LINK    $@
Linus Torvalds's avatar
Linus Torvalds committed
849

850 851 852
# Include targets which we want to
# execute if the rest of the kernel build went well.
vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
853
ifdef CONFIG_HEADERS_CHECK
854
	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
855 856 857
endif
ifdef CONFIG_SAMPLES
	$(Q)$(MAKE) $(build)=samples
858 859 860
endif
ifdef CONFIG_BUILD_DOCSRC
	$(Q)$(MAKE) $(build)=Documentation
861
endif
862
	+$(call if_changed,link-vmlinux)
863

Linus Torvalds's avatar
Linus Torvalds committed
864 865
# The actual objects are generated when descending, 
# make sure no implicit rule kicks in
866
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
Linus Torvalds's avatar
Linus Torvalds committed
867 868 869 870 871 872 873

# 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

874
PHONY += $(vmlinux-dirs)
875
$(vmlinux-dirs): prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
876 877
	$(Q)$(MAKE) $(build)=$@

878 879 880 881
define filechk_kernel.release
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
endef

882
# Store (new) KERNELRELEASE string in include/config/kernel.release
Roman Zippel's avatar
Roman Zippel committed
883
include/config/kernel.release: include/config/auto.conf FORCE
884
	$(call filechk,kernel.release)
885 886


Linus Torvalds's avatar
Linus Torvalds committed
887
# Things we need to do before we recursively start building the kernel
888 889 890 891
# 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
892

893
# Listed in dependency order
894
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
895

896
# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds's avatar
Linus Torvalds committed
897 898
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
Roman Zippel's avatar
Roman Zippel committed
899
prepare3: include/config/kernel.release
Linus Torvalds's avatar
Linus Torvalds committed
900
ifneq ($(KBUILD_SRC),)
901
	@$(kecho) '  Using $(srctree) as source for kernel'
902
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
903 904
		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
		echo >&2 "  in the '$(srctree)' directory.";\
Linus Torvalds's avatar
Linus Torvalds committed
905 906 907 908
		/bin/false; \
	fi;
endif

909
# prepare2 creates a makefile if using a separate output directory
Sam Ravnborg's avatar
Sam Ravnborg committed
910
prepare2: prepare3 outputmakefile asm-generic
Linus Torvalds's avatar
Linus Torvalds committed
911

David Howells's avatar
David Howells committed
912
prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
Sam Ravnborg's avatar
Sam Ravnborg committed
913
                   include/config/auto.conf
914
	$(cmd_crmodverdir)
Linus Torvalds's avatar
Linus Torvalds committed
915

916
archprepare: archheaders archscripts prepare1 scripts_basic
917 918

prepare0: archprepare FORCE
919
	$(Q)$(MAKE) $(build)=.
920

Linus Torvalds's avatar
Linus Torvalds committed
921
# All the preparing..
922
prepare: prepare0
Linus Torvalds's avatar
Linus Torvalds committed
923 924 925 926 927 928 929 930

# 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
931 932 933 934 935 936 937
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
938 939

define filechk_version.h
940 941
	(echo \#define LINUX_VERSION_CODE $(shell                         \
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
942
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
Linus Torvalds's avatar
Linus Torvalds committed
943 944
endef

David Howells's avatar
David Howells committed
945
$(version_h): $(srctree)/Makefile FORCE
Linus Torvalds's avatar
Linus Torvalds committed
946 947
	$(call filechk,version.h)

948
include/generated/utsrelease.h: include/config/kernel.release FORCE
949 950
	$(call filechk,utsrelease.h)

951 952
PHONY += headerdep
headerdep:
953 954
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
955

Linus Torvalds's avatar
Linus Torvalds committed
956 957
# ---------------------------------------------------------------------------

958
PHONY += depend dep
Linus Torvalds's avatar
Linus Torvalds committed
959 960 961
depend dep:
	@echo '*** Warning: make $@ is unnecessary now.'

962 963 964 965 966 967 968 969 970 971
# ---------------------------------------------------------------------------
# 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

972 973 974
# ---------------------------------------------------------------------------
# Kernel headers

975 976
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
977

978
hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
979 980 981

# 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)
982

983 984 985
PHONY += archheaders
archheaders:

986 987 988
PHONY += archscripts
archscripts:

989
PHONY += __headers
David Howells's avatar
David Howells committed
990
__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
991
	$(Q)$(MAKE) $(build)=scripts build_unifdef
992 993

PHONY += headers_install_all
994 995
headers_install_all:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
996

997
PHONY += headers_install
998
headers_install: __headers
999 1000 1001 1002
	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
	  $(error Headers not exportable for the $(SRCARCH) architecture))
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1003

1004 1005
PHONY += headers_check_all
headers_check_all: headers_install_all
1006
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1007

1008 1009
PHONY += headers_check
headers_check: headers_install
1010 1011
	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1012

Linus Torvalds's avatar
Linus Torvalds committed
1013 1014 1015 1016 1017
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

1018
# By default, build modules as well
Linus Torvalds's avatar
Linus Torvalds committed
1019

1020
all: modules
Linus Torvalds's avatar
Linus Torvalds committed
1021 1022

#	Build modules
Tejun Heo's avatar
Tejun Heo committed
1023 1024 1025 1026
#
#	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
1027

1028
PHONY += modules
1029
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
Tejun Heo's avatar
Tejun Heo committed
1030
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1031
	@$(kecho) '  Building modules, stage 2.';
1032
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1033
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
Linus Torvalds's avatar
Linus Torvalds committed
1034

1035 1036 1037
modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin

1038
%/modules.builtin: include/config/auto.conf
1039 1040
	$(Q)$(MAKE) $(modbuiltin)=$*

Linus Torvalds's avatar
Linus Torvalds committed
1041 1042

# Target to prepare building external modules
1043
PHONY += modules_prepare
1044
modules_prepare: prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
1045 1046

# Target to install modules
1047
PHONY += modules_install
Linus Torvalds's avatar
Linus Torvalds committed
1048 1049
modules_install: _modinst_ _modinst_post

1050
PHONY += _modinst_
1051
_modinst_:
Linus Torvalds's avatar
Linus Torvalds committed
1052 1053 1054 1055 1056 1057 1058 1059
	@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
1060
	@cp -f $(objtree)/modules.order $(MODLIB)/
1061
	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1062
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds's avatar
Linus Torvalds committed
1063

1064
# This depmod is only for convenience to give the initial
Linus Torvalds's avatar
Linus Torvalds committed
1065 1066
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1067
PHONY += _modinst_post
1068
_modinst_post: _modinst_
1069
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1070
	$(call cmd,depmod)
Linus Torvalds's avatar
Linus Torvalds committed
1071

1072 1073 1074 1075 1076 1077
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

Linus Torvalds's avatar
Linus Torvalds committed
1078 1079 1080 1081 1082 1083
else # CONFIG_MODULES

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

modules modules_install: FORCE
1084 1085 1086 1087 1088
	@echo >&2
	@echo >&2 "The present kernel configuration has modules disabled."
	@echo >&2 "Type 'make config' and enable loadable module support."
	@echo >&2 "Then build a kernel with module support enabled."
	@echo >&2
Linus Torvalds's avatar
Linus Torvalds committed
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103
	@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)

# Directories & files removed with 'make mrproper'
Sam Ravnborg's avatar
Sam Ravnborg committed
1104
MRPROPER_DIRS  += include/config usr/include include/generated          \
1105
                  arch/*/include/generated .tmp_objdiff
David Howells's avatar
David Howells committed
1106
MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1107 1108 1109
		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
		  signing_key.priv signing_key.x509 x509.genkey		\
		  extra_certificates signing_key.x509.keyid		\
1110
		  signing_key.x509.signer include/linux/version.h
Linus Torvalds's avatar
Linus Torvalds committed
1111 1112 1113 1114 1115

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1116
clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
Linus Torvalds's avatar
Linus Torvalds committed
1117

1118
PHONY += $(clean-dirs) clean archclean vmlinuxclean
Linus Torvalds's avatar
Linus Torvalds committed
1119 1120 1121
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1122 1123 1124 1125
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean

clean: archclean vmlinuxclean
Linus Torvalds's avatar
Linus Torvalds committed
1126 1127 1128 1129 1130 1131 1132

# 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)

1133
PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds's avatar
Linus Torvalds committed
1134 1135 1136 1137 1138 1139 1140 1141 1142
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

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

# distclean
#
1143
PHONY += distclean
Linus Torvalds's avatar
Linus Torvalds committed
1144 1145 1146

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
1147
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds's avatar
Linus Torvalds committed
1148
		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1149
		-o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
Linus Torvalds's avatar
Linus Torvalds committed
1150 1151 1152 1153 1154 1155 1156 1157
		-type f -print | xargs rm -f


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

1158 1159
%src-pkg: FORCE
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1160
%pkg: include/config/kernel.release FORCE
1161
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1162
rpm: include/config/kernel.release FORCE
1163
	$(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds's avatar
Linus Torvalds committed
1164 1165 1166 1167 1168


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

1169
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Linus Torvalds's avatar
Linus Torvalds committed
1170
boards := $(notdir $(boards))
1171 1172
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds's avatar
Linus Torvalds committed
1173 1174 1175

help:
	@echo  'Cleaning targets:'
1176
	@echo  '  clean		  - Remove most generated files but keep the config and'
1177
	@echo  '                    enough build support to build external modules'
1178
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1179
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
Linus Torvalds's avatar
Linus Torvalds committed
1180 1181 1182 1183 1184 1185 1186 1187
	@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'
1188
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1189 1190
	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
Linus Torvalds's avatar
Linus Torvalds committed
1191
	@echo  '  dir/            - Build all files in dir and below'
1192 1193 1194
	@echo  '  dir/file.[oisS] - Build specified target only'
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1195
	@echo  '  dir/file.ko     - Build module including final link'
1196
	@echo  '  modules_prepare - Set up for building external modules'
Linus Torvalds's avatar
Linus Torvalds committed
1197 1198
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1199
	@echo  '  gtags           - Generate GNU GLOBAL index'
1200
	@echo  '  kernelrelease	  - Output the release version string'
1201
	@echo  '  kernelversion	  - Output the version stored in Makefile'
1202
	@echo  '  image_name	  - Output the image name'
1203
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1204
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1205