Makefile 51 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
VERSION = 3
Linus Torvalds's avatar
Linus Torvalds committed
2
PATCHLEVEL = 16
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

129 130
# Fake the "Entering directory" message once, so that IDEs/editors are
# able to understand relative filenames.
131
sub-make: FORCE
132
	@echo "make[1]: Entering directory \`$(KBUILD_OUTPUT)'"
133 134
	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
	KBUILD_SRC=$(CURDIR) \
135 136
	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
	$(filter-out _all sub-make,$(MAKECMDGOALS))
Linus Torvalds's avatar
Linus Torvalds committed
137 138 139 140 141 142 143 144 145 146 147

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

155 156 157 158 159 160 161 162 163 164 165
ifeq ($(KBUILD_SRC),)
        # building in the source tree
        srctree := .
else
        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
                # building in a subdirectory of the source tree
                srctree := ..
        else
                srctree := $(KBUILD_SRC)
        endif
endif
166
objtree		:= .
Linus Torvalds's avatar
Linus Torvalds committed
167 168 169
src		:= $(srctree)
obj		:= $(objtree)

170
VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds's avatar
Linus Torvalds committed
171

172
export srctree objtree VPATH
Linus Torvalds's avatar
Linus Torvalds committed
173 174 175 176 177


# 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,
178
# then ARCH is assigned, getting whatever value it gets normally, and
Linus Torvalds's avatar
Linus Torvalds committed
179 180
# SUBARCH is subsequently ignored.

181 182
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
183
				  -e s/arm.*/arm/ -e s/sa110/arm/ \
184
				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
Paul Mundt's avatar
Paul Mundt committed
185
				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
186
				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
Linus Torvalds's avatar
Linus Torvalds committed
187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203

# 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.
204 205
# 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
206 207
# Default value for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
208
ARCH		?= $(SUBARCH)
209
CROSS_COMPILE	?= $(CONFIG_CROSS_COMPILE:"%"=%)
Linus Torvalds's avatar
Linus Torvalds committed
210 211

# Architecture as present in compile.h
212 213
UTS_MACHINE 	:= $(ARCH)
SRCARCH 	:= $(ARCH)
Linus Torvalds's avatar
Linus Torvalds committed
214

215 216 217 218 219 220 221
# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
        SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
        SRCARCH := x86
endif
222

Sam Ravnborg's avatar
Sam Ravnborg committed
223
# Additional ARCH settings for sparc
224 225 226
ifeq ($(ARCH),sparc32)
       SRCARCH := sparc
endif
227
ifeq ($(ARCH),sparc64)
Sam Ravnborg's avatar
Sam Ravnborg committed
228
       SRCARCH := sparc
229
endif
230

231 232 233 234 235
# Additional ARCH settings for sh
ifeq ($(ARCH),sh64)
       SRCARCH := sh
endif

236
# Additional ARCH settings for tile
237 238 239
ifeq ($(ARCH),tilepro)
       SRCARCH := tile
endif
240 241 242 243
ifeq ($(ARCH),tilegx)
       SRCARCH := tile
endif

Sam Ravnborg's avatar
Sam Ravnborg committed
244 245 246
# Where to locate arch specific headers
hdr-arch  := $(SRCARCH)

247
KCONFIG_CONFIG	?= .config
248
export KCONFIG_CONFIG
249

Linus Torvalds's avatar
Linus Torvalds committed
250 251 252 253 254
# 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)

255 256
HOSTCC       = gcc
HOSTCXX      = g++
257
HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
258
HOSTCXXFLAGS = -O2
Linus Torvalds's avatar
Linus Torvalds committed
259

260 261 262 263 264
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

265 266
# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.
Linus Torvalds's avatar
Linus Torvalds committed
267 268 269 270

KBUILD_MODULES :=
KBUILD_BUILTIN := 1

271 272 273 274
# 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
# make sure the checksums are up to date before we record them.
Linus Torvalds's avatar
Linus Torvalds committed
275 276 277 278 279

ifeq ($(MAKECMDGOALS),modules)
  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
endif

280 281 282
# 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
Linus Torvalds's avatar
Linus Torvalds committed
283 284 285 286 287 288 289 290 291

ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
  KBUILD_MODULES := 1
endif

ifeq ($(MAKECMDGOALS),)
  KBUILD_MODULES := 1
endif

292
export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds's avatar
Linus Torvalds committed
293 294 295 296 297 298 299 300 301 302 303 304 305
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.
306
# If it is set to "quiet_", only the short version will be printed.
307
# If it is set to "silent_", nothing will be printed at all, since
Linus Torvalds's avatar
Linus Torvalds committed
308 309
# the variable $(silent_cmd_cc_o_c) doesn't exist.
#
Adrian Bunk's avatar
Adrian Bunk committed
310
# A simple variant is to prefix commands with $(Q) - that's useful
Linus Torvalds's avatar
Linus Torvalds committed
311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328
# 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

329 330 331 332 333
ifneq ($(filter 4.%,$(MAKE_VERSION)),)	# make-4
ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  quiet=silent_
endif
else					# make-3.8x
334
ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
Linus Torvalds's avatar
Linus Torvalds committed
335 336
  quiet=silent_
endif
337
endif
Linus Torvalds's avatar
Linus Torvalds committed
338 339 340

export quiet Q KBUILD_VERBOSE

341 342 343 344 345 346 347 348
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
349 350 351 352

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

353 354
# We need some generic definitions (do not try to remake the file).
$(srctree)/scripts/Kbuild.include: ;
355
include $(srctree)/scripts/Kbuild.include
Linus Torvalds's avatar
Linus Torvalds committed
356 357 358 359 360 361 362 363 364 365 366 367 368

# 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
369
INSTALLKERNEL  := installkernel
Linus Torvalds's avatar
Linus Torvalds committed
370 371 372 373
DEPMOD		= /sbin/depmod
PERL		= perl
CHECK		= sparse

374 375
CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
		  -Wbitwise -Wno-return-void $(CF)
376 377 378
CFLAGS_MODULE   =
AFLAGS_MODULE   =
LDFLAGS_MODULE  =
Linus Torvalds's avatar
Linus Torvalds committed
379 380
CFLAGS_KERNEL	=
AFLAGS_KERNEL	=
381
CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage
Linus Torvalds's avatar
Linus Torvalds committed
382 383


384 385 386 387 388 389 390 391
# 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
392 393
# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
394 395 396 397 398 399
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
400

401
KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds's avatar
Linus Torvalds committed
402

403
KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
404
		   -fno-strict-aliasing -fno-common \
405
		   -Werror-implicit-function-declaration \
406 407
		   -Wno-format-security

408 409
KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
410
KBUILD_AFLAGS   := -D__ASSEMBLY__
411 412 413
KBUILD_AFLAGS_MODULE  := -DMODULE
KBUILD_CFLAGS_MODULE  := -DMODULE
KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Linus Torvalds's avatar
Linus Torvalds committed
414

Roman Zippel's avatar
Roman Zippel committed
415 416
# Read KERNELRELEASE from include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
417
KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
418

419
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
420
export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
421 422
export CPP AR NM STRIP OBJCOPY OBJDUMP
export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
423
export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds's avatar
Linus Torvalds committed
424

425
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
426
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
427
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
428
export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
429
export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
430
export KBUILD_ARFLAGS
Linus Torvalds's avatar
Linus Torvalds committed
431 432 433 434 435 436 437 438

# 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

439 440 441
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
442 443
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
444 445 446 447 448

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

# Basic helpers built in scripts/
449
PHONY += scripts_basic
Linus Torvalds's avatar
Linus Torvalds committed
450 451
scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic
452
	$(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds's avatar
Linus Torvalds committed
453

454 455 456
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

457
PHONY += outputmakefile
458 459 460
# 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
461
outputmakefile:
462
ifneq ($(KBUILD_SRC),)
463
	$(Q)ln -fsn $(srctree) source
464 465 466
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif
Linus Torvalds's avatar
Linus Torvalds committed
467

Sam Ravnborg's avatar
Sam Ravnborg committed
468 469 470 471
# Support for using generic headers in asm-generic
PHONY += asm-generic
asm-generic:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472 473 474
	            src=asm obj=arch/$(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
475

Linus Torvalds's avatar
Linus Torvalds committed
476 477 478 479
# 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.
480
# For example 'make oldconfig all'.
Linus Torvalds's avatar
Linus Torvalds committed
481 482 483
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

484
version_h := include/generated/uapi/linux/version.h
David Howells's avatar
David Howells committed
485

486
no-dot-config-targets := clean mrproper distclean \
487
			 cscope gtags TAGS tags help %docs check% coccicheck \
David Howells's avatar
David Howells committed
488
			 $(version_h) headers_% archheaders archscripts \
489
			 kernelversion %src-pkg
Linus Torvalds's avatar
Linus Torvalds committed
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.

515 516 517 518 519 520 521 522 523 524
PHONY += $(MAKECMDGOALS) __build_one_by_one

$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
	@:

__build_one_by_one:
	$(Q)set -e; \
	for i in $(MAKECMDGOALS); do \
		$(MAKE) -f $(srctree)/Makefile $$i; \
	done
Linus Torvalds's avatar
Linus Torvalds committed
525 526 527 528 529 530 531 532 533 534

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'
535
include $(srctree)/arch/$(SRCARCH)/Makefile
536
export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds's avatar
Linus Torvalds committed
537

538 539 540 541
config: scripts_basic outputmakefile FORCE
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

%config: scripts_basic outputmakefile FORCE
Linus Torvalds's avatar
Linus Torvalds committed
542 543 544 545 546 547 548 549 550 551
	$(Q)$(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
552
# in parallel
553
PHONY += scripts
554 555
scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
	 asm-generic
Linus Torvalds's avatar
Linus Torvalds committed
556 557 558 559
	$(Q)$(MAKE) $(build)=$(@)

# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
560
drivers-y	:= drivers/ sound/ firmware/
Linus Torvalds's avatar
Linus Torvalds committed
561 562 563 564 565 566
net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
567 568
# Read in config
-include include/config/auto.conf
Linus Torvalds's avatar
Linus Torvalds committed
569

570
ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds's avatar
Linus Torvalds committed
571 572
# Read in dependencies to all Kconfig* files, make sure to run
# oldconfig if changes are detected.
573
-include include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
574 575

# To avoid any implicit rule to kick in, define an empty command
576
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds's avatar
Linus Torvalds committed
577

578
# If .config is newer than include/config/auto.conf, someone tinkered
579
# with it and forgot to run make oldconfig.
580
# if auto.conf.cmd is missing then we are probably in a cleaned tree so
581
# we execute the config step to be sure to catch updated Kconfig files
582
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
583
	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
584
else
585
# external modules needs include/generated/autoconf.h and include/config/auto.conf
586 587 588 589
# 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:
590
	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
591 592 593 594 595
	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 ;							\
596 597 598
	/bin/false)

endif # KBUILD_EXTMOD
599

Linus Torvalds's avatar
Linus Torvalds committed
600 601
else
# Dummy target needed, because used as prerequisite
602
include/config/auto.conf: ;
603
endif # $(dot-config)
Linus Torvalds's avatar
Linus Torvalds committed
604 605 606 607

# 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
608
# Defaults to vmlinux, but the arch makefile usually adds further targets
Linus Torvalds's avatar
Linus Torvalds committed
609 610
all: vmlinux

611 612 613 614
include $(srctree)/arch/$(SRCARCH)/Makefile

KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)

Linus Torvalds's avatar
Linus Torvalds committed
615
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
616
KBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,)
Linus Torvalds's avatar
Linus Torvalds committed
617
else
618
KBUILD_CFLAGS	+= -O2
Linus Torvalds's avatar
Linus Torvalds committed
619 620
endif

Andi Kleen's avatar
Andi Kleen committed
621 622 623 624 625 626 627 628 629 630
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

631
ifneq ($(CONFIG_FRAME_WARN),0)
632 633 634
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

635
# Handle stack protector mode.
636
ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
637 638
  stackp-flag := -fstack-protector
  ifeq ($(call cc-option, $(stackp-flag)),)
639
    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
640
             -fstack-protector not supported by compiler)
641
  endif
642 643
else
ifdef CONFIG_CC_STACKPROTECTOR_STRONG
644 645 646 647 648
  stackp-flag := -fstack-protector-strong
  ifeq ($(call cc-option, $(stackp-flag)),)
    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
	      -fstack-protector-strong not supported by compiler)
  endif
649 650 651
else
  # Force off for distro compilers that enable stack protector by default.
  stackp-flag := $(call cc-option, -fno-stack-protector)
652
endif
653
endif
654
KBUILD_CFLAGS += $(stackp-flag)
655

656 657 658 659 660 661 662 663 664 665 666 667 668 669
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

670 671
# This warning generated too much noise in a regular build.
# Use make W=1 to enable this warning (see scripts/Makefile.build)
672
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
673
endif
674

Linus Torvalds's avatar
Linus Torvalds committed
675
ifdef CONFIG_FRAME_POINTER
676
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds's avatar
Linus Torvalds committed
677
else
678 679 680 681 682 683
# 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
684
KBUILD_CFLAGS	+= -fomit-frame-pointer
Linus Torvalds's avatar
Linus Torvalds committed
685
endif
686
endif
Linus Torvalds's avatar
Linus Torvalds committed
687 688

ifdef CONFIG_DEBUG_INFO
689
KBUILD_CFLAGS	+= -g
690
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
Linus Torvalds's avatar
Linus Torvalds committed
691 692
endif

693
ifdef CONFIG_DEBUG_INFO_REDUCED
694 695
KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
		   $(call cc-option,-fno-var-tracking)
696 697
endif

698
ifdef CONFIG_FUNCTION_TRACER
699 700 701 702 703
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)
704
ifdef CONFIG_DYNAMIC_FTRACE
705
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
706 707 708 709
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
710 711
endif

712 713 714 715 716
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

717
# arch Makefile may override CC so keep this after arch Makefile is included
718
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
719 720
CHECKFLAGS     += $(NOSTDINC_FLAGS)

Linus Torvalds's avatar
Linus Torvalds committed
721
# warn about C99 declaration after statement
722
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds's avatar
Linus Torvalds committed
723

724
# disable pointer signed / unsigned warnings in gcc 4.0
725
KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
Linus Torvalds's avatar
Linus Torvalds committed
726

727
# disable invalid "can't wrap" optimizations for signed / pointers
728
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
729

730 731 732
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

733 734 735 736 737 738
# 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)

739 740 741
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

742 743 744
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

745 746 747 748 749
# check for 'asm goto'
ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
endif

750 751
include $(srctree)/scripts/Makefile.extrawarn

752
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
753 754 755
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS += $(KAFLAGS)
KBUILD_CFLAGS += $(KCFLAGS)
756

Roland McGrath's avatar
Roland McGrath committed
757 758
# Use --build-id when available.
LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
759
			      $(call cc-ldoption, -Wl$(comma)--build-id,))
760
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
Roland McGrath's avatar
Roland McGrath committed
761 762
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

763
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
764
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
765 766
endif

Linus Torvalds's avatar
Linus Torvalds committed
767
# Default kernel image to build when no specific target is given.
768
# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds's avatar
Linus Torvalds committed
769 770 771 772 773 774 775 776 777 778
# 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

779 780 781 782 783 784 785
#
# 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
786 787 788
#
# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
# relocations required by build roots.  This is not defined in the
789
# makefile but the argument can be passed to make if needed.
Linus Torvalds's avatar
Linus Torvalds committed
790 791
#

792
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds's avatar
Linus Torvalds committed
793 794
export MODLIB

795
#
796 797 798 799
# INSTALL_MOD_STRIP, if defined, will cause modules to be
# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
# the default option --strip-debug will be used.  Otherwise,
# INSTALL_MOD_STRIP value will be used as the options to the strip command.
800

801 802
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
803
mod_strip_cmd = $(STRIP) --strip-debug
804
else
805
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
806 807
endif # INSTALL_MOD_STRIP=1
else
808
mod_strip_cmd = true
809 810 811
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

812 813 814
# 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
815 816 817 818 819 820
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
821 822 823
# 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
824

825
ifdef CONFIG_MODULE_SIG_ALL
826 827 828
MODSECKEY = ./signing_key.priv
MODPUBKEY = ./signing_key.x509
export MODPUBKEY
829
mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
830 831 832 833 834 835
else
mod_sign_cmd = true
endif
export mod_sign_cmd


Linus Torvalds's avatar
Linus Torvalds committed
836
ifeq ($(KBUILD_EXTMOD),)
837
core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds's avatar
Linus Torvalds committed
838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855

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)

856
# Externally visible symbols (used by link-vmlinux.sh)
857 858 859
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
860
export LDFLAGS_vmlinux
861 862
# used by scripts/pacmage/Makefile
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
863

864
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
Linus Torvalds's avatar
Linus Torvalds committed
865

866 867 868
# 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
869

870 871 872
# Include targets which we want to
# execute if the rest of the kernel build went well.
vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
873
ifdef CONFIG_HEADERS_CHECK
874
	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
875 876 877
endif
ifdef CONFIG_SAMPLES
	$(Q)$(MAKE) $(build)=samples
878 879 880
endif
ifdef CONFIG_BUILD_DOCSRC
	$(Q)$(MAKE) $(build)=Documentation
881
endif
882
	+$(call if_changed,link-vmlinux)
883

884
# The actual objects are generated when descending,
Linus Torvalds's avatar
Linus Torvalds committed
885
# make sure no implicit rule kicks in
886
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
Linus Torvalds's avatar
Linus Torvalds committed
887 888 889 890 891 892 893

# 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

894
PHONY += $(vmlinux-dirs)
895
$(vmlinux-dirs): prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
896 897
	$(Q)$(MAKE) $(build)=$@

898 899 900 901
define filechk_kernel.release
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
endef

902
# Store (new) KERNELRELEASE string in include/config/kernel.release
Roman Zippel's avatar
Roman Zippel committed
903
include/config/kernel.release: include/config/auto.conf FORCE
904
	$(call filechk,kernel.release)
905 906


Linus Torvalds's avatar
Linus Torvalds committed
907
# Things we need to do before we recursively start building the kernel
908 909 910 911
# 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
912

913
# Listed in dependency order
914
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
915

916
# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds's avatar
Linus Torvalds committed
917 918
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
Roman Zippel's avatar
Roman Zippel committed
919
prepare3: include/config/kernel.release
Linus Torvalds's avatar
Linus Torvalds committed
920
ifneq ($(KBUILD_SRC),)
921
	@$(kecho) '  Using $(srctree) as source for kernel'
922
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
923 924
		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
		echo >&2 "  in the '$(srctree)' directory.";\
Linus Torvalds's avatar
Linus Torvalds committed
925 926 927 928
		/bin/false; \
	fi;
endif

929
# prepare2 creates a makefile if using a separate output directory
Sam Ravnborg's avatar
Sam Ravnborg committed
930
prepare2: prepare3 outputmakefile asm-generic
Linus Torvalds's avatar
Linus Torvalds committed
931

David Howells's avatar
David Howells committed
932
prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
Sam Ravnborg's avatar
Sam Ravnborg committed
933
                   include/config/auto.conf
934
	$(cmd_crmodverdir)
Linus Torvalds's avatar
Linus Torvalds committed
935

936
archprepare: archheaders archscripts prepare1 scripts_basic
937 938

prepare0: archprepare FORCE
939
	$(Q)$(MAKE) $(build)=.
940

Linus Torvalds's avatar
Linus Torvalds committed
941
# All the preparing..
942
prepare: prepare0
Linus Torvalds's avatar
Linus Torvalds committed
943 944 945 946 947 948 949 950

# 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
951 952 953 954 955 956 957
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
958 959

define filechk_version.h
960 961
	(echo \#define LINUX_VERSION_CODE $(shell                         \
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
962
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
Linus Torvalds's avatar
Linus Torvalds committed
963 964
endef

David Howells's avatar
David Howells committed
965
$(version_h): $(srctree)/Makefile FORCE
Linus Torvalds's avatar
Linus Torvalds committed
966 967
	$(call filechk,version.h)

968
include/generated/utsrelease.h: include/config/kernel.release FORCE
969 970
	$(call filechk,utsrelease.h)

971 972
PHONY += headerdep
headerdep:
973 974
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
975

Linus Torvalds's avatar
Linus Torvalds committed
976 977
# ---------------------------------------------------------------------------

978
PHONY += depend dep
Linus Torvalds's avatar
Linus Torvalds committed
979 980 981
depend dep:
	@echo '*** Warning: make $@ is unnecessary now.'

982 983 984 985 986 987 988 989 990 991
# ---------------------------------------------------------------------------
# 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

992 993 994
# ---------------------------------------------------------------------------
# Kernel headers

995 996
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
997

998
hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
999 1000 1001

# 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)
1002

1003 1004 1005
PHONY += archheaders
archheaders:

1006 1007 1008
PHONY += archscripts
archscripts:

1009
PHONY += __headers
David Howells's avatar
David Howells committed
1010
__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1011
	$(Q)$(MAKE) $(build)=scripts build_unifdef
1012 1013

PHONY += headers_install_all
1014 1015
headers_install_all:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1016

1017
PHONY += headers_install
1018
headers_install: __headers
1019 1020 1021 1022
	$(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)
1023

1024 1025
PHONY += headers_check_all
headers_check_all: headers_install_all
1026
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1027

1028 1029
PHONY += headers_check
headers_check: headers_install
1030 1031
	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1032

Linus Torvalds's avatar
Linus Torvalds committed
1033 1034 1035 1036 1037
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

1038
# By default, build modules as well
Linus Torvalds's avatar
Linus Torvalds committed
1039

1040
all: modules
Linus Torvalds's avatar
Linus Torvalds committed
1041

1042
# Build modules
Tejun Heo's avatar
Tejun Heo committed
1043
#
1044 1045 1046
# 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
1047

1048
PHONY += modules
1049
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
Tejun Heo's avatar
Tejun Heo committed
1050
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1051
	@$(kecho) '  Building modules, stage 2.';
1052
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1053
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
Linus Torvalds's avatar
Linus Torvalds committed
1054

1055 1056 1057
modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin

1058
%/modules.builtin: include/config/auto.conf
1059 1060
	$(Q)$(MAKE) $(modbuiltin)=$*

Linus Torvalds's avatar
Linus Torvalds committed
1061 1062

# Target to prepare building external modules
1063
PHONY += modules_prepare
1064
modules_prepare: prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
1065 1066

# Target to install modules
1067
PHONY += modules_install
Linus Torvalds's avatar
Linus Torvalds committed
1068 1069
modules_install: _modinst_ _modinst_post

1070
PHONY += _modinst_
1071
_modinst_:
Linus Torvalds's avatar
Linus Torvalds committed
1072 1073 1074
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1075
	@ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
Linus Torvalds's avatar
Linus Torvalds committed
1076 1077
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1078
		ln -s $(CURDIR) $(MODLIB)/build ; \
Linus Torvalds's avatar
Linus Torvalds committed
1079
	fi
Tejun Heo's avatar
Tejun Heo committed
1080
	@cp -f $(objtree)/modules.order $(MODLIB)/
1081
	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1082
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds's avatar
Linus Torvalds committed
1083

1084
# This depmod is only for convenience to give the initial
Linus Torvalds's avatar
Linus Torvalds committed
1085 1086
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1087
PHONY += _modinst_post
1088
_modinst_post: _modinst_
1089
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1090
	$(call cmd,depmod)
Linus Torvalds's avatar
Linus Torvalds committed
1091

1092 1093 1094 1095 1096 1097
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
1098 1099 1100 1101 1102 1103
else # CONFIG_MODULES

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

modules modules_install: FORCE
1104 1105 1106 1107 1108
	@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
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
	@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
1124
MRPROPER_DIRS  += include/config usr/include include/generated          \
1125
		  arch/*/include/generated .tmp_objdiff
David Howells's avatar
David Howells committed
1126
MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1127 1128 1129
		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
		  signing_key.priv signing_key.x509 x509.genkey		\
		  extra_certificates signing_key.x509.keyid		\
1130
		  signing_key.x509.signer include/linux/version.h
Linus Torvalds's avatar
Linus Torvalds committed
1131 1132 1133 1134 1135

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1136
clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
Linus Torvalds's avatar
Linus Torvalds committed
1137

1138
PHONY += $(clean-dirs) clean archclean vmlinuxclean
Linus Torvalds's avatar
Linus Torvalds committed
1139 1140 1141
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1142 1143 1144 1145
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean

clean: archclean vmlinuxclean
Linus Torvalds's avatar
Linus Torvalds committed
1146 1147 1148 1149 1150 1151 1152

# 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)

1153
PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds's avatar
Linus Torvalds committed
1154 1155 1156 1157 1158 1159 1160 1161 1162
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

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

# distclean
#
1163
PHONY += distclean
Linus Torvalds's avatar
Linus Torvalds committed
1164 1165 1166

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
1167
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds's avatar
Linus Torvalds committed
1168
		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1169
		-o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
Linus Torvalds's avatar
Linus Torvalds committed
1170 1171 1172 1173 1174 1175 1176 1177
		-type f -print | xargs rm -f


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

1178 1179
%src-pkg: FORCE
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1180
%pkg: include/config/kernel.release FORCE
1181
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1182
rpm: include/config/kernel.release FORCE
1183
	$(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds's avatar
Linus Torvalds committed
1184 1185 1186 1187 1188


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

1189
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Linus Torvalds's avatar
Linus Torvalds committed
1190
boards := $(notdir $(boards))
1191 1192
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds's avatar
Linus Torvalds committed
1193 1194 1195

help:
	@echo  'Cleaning targets:'
1196
	@echo  '  clean		  - Remove most generated files but keep the config and'
1197
	@echo  '                    enough build support to build external modules'
1198
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1199
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'