Makefile 60.0 KB
Newer Older
1
# SPDX-License-Identifier: GPL-2.0
L
Linus Torvalds 已提交
2
VERSION = 5
L
Linus Torvalds 已提交
3
PATCHLEVEL = 7
L
Linus Torvalds 已提交
4
SUBLEVEL = 0
L
Linus Torvalds 已提交
5
EXTRAVERSION = -rc5
L
Linus Torvalds 已提交
6
NAME = Kleptomaniac Octopus
L
Linus Torvalds 已提交
7 8 9 10 11 12 13

# *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.

14 15 16 17
# That's our default target when none is given on the command line
PHONY := _all
_all:

L
Linus Torvalds 已提交
18 19 20 21 22 23
# 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
24
# unavoidable when linking the built-in.a targets which finally
L
Linus Torvalds 已提交
25 26 27 28 29 30 31 32 33
# 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.

34
ifneq ($(sub_make_done),1)
35 36 37 38 39 40 41 42 43 44 45 46 47 48

# Do not use make's built-in rules and variables
# (this increases performance and avoids hard-to-debug behaviour)
MAKEFLAGS += -rR

# Avoid funny character set dependencies
unexport LC_ALL
LC_COLLATE=C
LC_NUMERIC=C
export LC_COLLATE LC_NUMERIC

# Avoid interference with shell env settings
unexport GREP_OPTIONS

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70
# 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.
# If it is set to "silent_", nothing will be printed at all, since
# the variable $(silent_cmd_cc_o_c) doesn't exist.
#
# A simple variant is to prefix commands with $(Q) - that's useful
# 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.
R
Randy Dunlap 已提交
71
# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
72
#
L
Linus Torvalds 已提交
73 74 75
# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands

76 77
ifeq ("$(origin V)", "command line")
  KBUILD_VERBOSE = $(V)
L
Linus Torvalds 已提交
78 79 80 81 82
endif
ifndef KBUILD_VERBOSE
  KBUILD_VERBOSE = 0
endif

83 84 85 86 87 88 89 90 91 92 93
ifeq ($(KBUILD_VERBOSE),1)
  quiet =
  Q =
else
  quiet=quiet_
  Q = @
endif

# If the user is running make -s (silent mode), suppress echoing of
# commands

94
ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
95 96 97 98 99
  quiet=silent_
endif

export quiet Q KBUILD_VERBOSE

100 101 102 103 104 105 106 107 108 109
# Kbuild will save output files in the current working directory.
# This does not need to match to the root of the kernel source tree.
#
# For example, you can do this:
#
#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
#
# If you want to save output files in a different location, there are
# two syntaxes to specify it.
#
L
Linus Torvalds 已提交
110 111
# 1) O=
# Use "make O=dir/to/store/output/files/"
S
Sam Ravnborg 已提交
112
#
L
Linus Torvalds 已提交
113
# 2) Set KBUILD_OUTPUT
114 115
# Set the environment variable KBUILD_OUTPUT to point to the output directory.
# export KBUILD_OUTPUT=dir/to/store/output/files/; make
L
Linus Torvalds 已提交
116 117 118 119
#
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.

120
# Do we want to change the working directory?
121 122
ifeq ("$(origin O)", "command line")
  KBUILD_OUTPUT := $(O)
L
Linus Torvalds 已提交
123 124
endif

125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142
ifneq ($(KBUILD_OUTPUT),)
# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
# expand a shell special character '~'. We use a somewhat tedious way here.
abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
$(if $(abs_objtree),, \
     $(error failed to create output directory "$(KBUILD_OUTPUT)"))

# $(realpath ...) resolves symlinks
abs_objtree := $(realpath $(abs_objtree))
else
abs_objtree := $(CURDIR)
endif # ifneq ($(KBUILD_OUTPUT),)

ifeq ($(abs_objtree),$(CURDIR))
# Suppress "Entering directory ..." unless we are changing the work directory.
MAKEFLAGS += --no-print-directory
else
need-sub-make := 1
143 144
endif

145
abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
L
Linus Torvalds 已提交
146

147 148 149
ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
$(error source directory cannot contain spaces or colons)
endif
L
Linus Torvalds 已提交
150

151
ifneq ($(abs_srctree),$(abs_objtree))
152 153 154
# Look for make include files relative to root of kernel src
#
# This does not become effective immediately because MAKEFLAGS is re-parsed
155 156
# once after the Makefile is read. We need to invoke sub-make.
MAKEFLAGS += --include-dir=$(abs_srctree)
157
need-sub-make := 1
158
endif
159

160 161 162 163 164 165 166 167
ifneq ($(filter 3.%,$(MAKE_VERSION)),)
# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
# We need to invoke sub-make to avoid implicit rules in the top Makefile.
need-sub-make := 1
# Cancel implicit rules for this Makefile.
$(lastword $(MAKEFILE_LIST)): ;
endif

168
export abs_srctree abs_objtree
169 170
export sub_make_done := 1

171 172
ifeq ($(need-sub-make),1)

173 174
PHONY += $(MAKECMDGOALS) sub-make

175
$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
176
	@:
177

C
Cao jin 已提交
178
# Invoke a second make in the output directory, passing relevant variables
179
sub-make:
180
	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
L
Linus Torvalds 已提交
181

182
endif # need-sub-make
183
endif # sub_make_done
184

L
Linus Torvalds 已提交
185
# We process the rest of the Makefile if this is the final invocation of make
186
ifeq ($(need-sub-make),)
L
Linus Torvalds 已提交
187

188 189 190 191 192
# Do not print "Entering directory ...",
# but we want to display it when entering to the output directory
# so that IDEs/editors are able to understand relative filenames.
MAKEFLAGS += --no-print-directory

193 194 195 196 197 198 199
# 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.
#
C
Cao jin 已提交
200 201
# See the file "Documentation/dev-tools/sparse.rst" for more details,
# including where to get the "sparse" utility.
202 203 204 205 206 207 208 209

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

M
Masahiro Yamada 已提交
210 211
# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
# directory of external module to build. Setting M= takes precedence.
212 213 214 215
ifeq ("$(origin M)", "command line")
  KBUILD_EXTMOD := $(M)
endif

216 217
export KBUILD_CHECKSRC KBUILD_EXTMOD

218 219
extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)

220
ifeq ($(abs_srctree),$(abs_objtree))
221 222
        # building in the source tree
        srctree := .
223
	building_out_of_srctree :=
224
else
225
        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
226 227 228
                # building in a subdirectory of the source tree
                srctree := ..
        else
229
                srctree := $(abs_srctree)
230
        endif
231
	building_out_of_srctree := 1
232
endif
233

234 235 236
ifneq ($(KBUILD_ABS_SRCTREE),)
srctree := $(abs_srctree)
endif
237

238
objtree		:= .
239
VPATH		:= $(srctree)
L
Linus Torvalds 已提交
240

241
export building_out_of_srctree srctree objtree VPATH
L
Linus Torvalds 已提交
242

243 244 245 246 247 248 249 250 251 252 253
# 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.
# For example 'make oldconfig all'.
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

version_h := include/generated/uapi/linux/version.h
old_version_h := include/linux/version.h

254 255
clean-targets := %clean mrproper cleandocs
no-dot-config-targets := $(clean-targets) \
256
			 cscope gtags TAGS tags help% %docs check% coccicheck \
257
			 $(version_h) headers headers_% archheaders archscripts \
258 259
			 %asm-generic kernelversion %src-pkg dt_binding_check \
			 outputmakefile
260 261
no-sync-config-targets := $(no-dot-config-targets) install %install \
			   kernelrelease
262
single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
263

264 265 266 267
config-build	:=
mixed-build	:=
need-config	:= 1
may-sync-config	:= 1
268
single-build	:=
269 270 271

ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
272
		need-config :=
273 274 275
	endif
endif

276 277
ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
278
		may-sync-config :=
279 280 281 282
	endif
endif

ifneq ($(KBUILD_EXTMOD),)
283
	may-sync-config :=
284 285
endif

286 287
ifeq ($(KBUILD_EXTMOD),)
        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
288
		config-build := 1
289
                ifneq ($(words $(MAKECMDGOALS)),1)
290
			mixed-build := 1
291 292 293
                endif
        endif
endif
294

295 296 297 298 299 300 301 302
# We cannot build single targets and the others at the same time
ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
	single-build := 1
	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
		mixed-build := 1
	endif
endif

303 304 305
# For "make -j clean all", "make -j mrproper defconfig all", etc.
ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
306
		mixed-build := 1
307 308 309
        endif
endif

310 311 312
# install and modules_install need also be processed one by one
ifneq ($(filter install,$(MAKECMDGOALS)),)
        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
313
		mixed-build := 1
314 315 316
        endif
endif

317
ifdef mixed-build
318 319 320 321 322 323 324 325 326 327 328 329 330 331 332
# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.

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

333
else # !mixed-build
334 335 336 337 338 339 340 341

include scripts/Kbuild.include

# Read KERNELRELEASE from include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION

342
include scripts/subarch.include
L
Linus Torvalds 已提交
343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361

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

# CROSS_COMPILE specify the prefix used for all executables used
# during compilation. Only gcc and related bin-utils executables
# are prefixed with $(CROSS_COMPILE).
# CROSS_COMPILE can be set on the command line
# make CROSS_COMPILE=ia64-linux-
# Alternatively CROSS_COMPILE can be set in the environment.
# Default value for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
362
ARCH		?= $(SUBARCH)
L
Linus Torvalds 已提交
363 364

# Architecture as present in compile.h
365 366
UTS_MACHINE 	:= $(ARCH)
SRCARCH 	:= $(ARCH)
L
Linus Torvalds 已提交
367

368 369 370 371 372 373 374
# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
        SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
        SRCARCH := x86
endif
375

S
Sam Ravnborg 已提交
376
# Additional ARCH settings for sparc
N
Namhyung Kim 已提交
377 378 379
ifeq ($(ARCH),sparc32)
       SRCARCH := sparc
endif
380
ifeq ($(ARCH),sparc64)
S
Sam Ravnborg 已提交
381
       SRCARCH := sparc
382
endif
383

384 385 386 387 388
# Additional ARCH settings for sh
ifeq ($(ARCH),sh64)
       SRCARCH := sh
endif

R
Roman Zippel 已提交
389
KCONFIG_CONFIG	?= .config
390
export KCONFIG_CONFIG
R
Roman Zippel 已提交
391

392 393 394
# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
export KBUILD_DEFCONFIG := defconfig

L
Linus Torvalds 已提交
395
# SHELL used by kbuild
396
CONFIG_SHELL := sh
L
Linus Torvalds 已提交
397

398 399 400
HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
401

402 403 404 405 406 407 408
ifneq ($(LLVM),)
HOSTCC	= clang
HOSTCXX	= clang++
else
HOSTCC	= gcc
HOSTCXX	= g++
endif
409 410 411 412 413 414

export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
			      -O2 -fomit-frame-pointer -std=gnu89
export KBUILD_USERLDFLAGS :=

KBUILD_HOSTCFLAGS   := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
415
KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
416 417
KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
L
Linus Torvalds 已提交
418 419 420

# Make variables (CC, etc...)
CPP		= $(CC) -E
421 422 423 424 425 426 427 428 429 430 431 432 433
ifneq ($(LLVM),)
CC		= clang
LD		= ld.lld
AR		= llvm-ar
NM		= llvm-nm
OBJCOPY		= llvm-objcopy
OBJDUMP		= llvm-objdump
READELF		= llvm-readelf
OBJSIZE		= llvm-size
STRIP		= llvm-strip
else
CC		= $(CROSS_COMPILE)gcc
LD		= $(CROSS_COMPILE)ld
L
Linus Torvalds 已提交
434 435 436 437
AR		= $(CROSS_COMPILE)ar
NM		= $(CROSS_COMPILE)nm
OBJCOPY		= $(CROSS_COMPILE)objcopy
OBJDUMP		= $(CROSS_COMPILE)objdump
438
READELF		= $(CROSS_COMPILE)readelf
439 440 441
OBJSIZE		= $(CROSS_COMPILE)size
STRIP		= $(CROSS_COMPILE)strip
endif
442
PAHOLE		= pahole
443 444
LEX		= flex
YACC		= bison
L
Linus Torvalds 已提交
445
AWK		= awk
446
INSTALLKERNEL  := installkernel
L
Linus Torvalds 已提交
447 448
DEPMOD		= /sbin/depmod
PERL		= perl
449
PYTHON		= python
450
PYTHON3		= python3
L
Linus Torvalds 已提交
451
CHECK		= sparse
452
BASH		= bash
L
Linus Torvalds 已提交
453

454
CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
455
		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
456
NOSTDINC_FLAGS :=
457 458 459
CFLAGS_MODULE   =
AFLAGS_MODULE   =
LDFLAGS_MODULE  =
L
Linus Torvalds 已提交
460 461
CFLAGS_KERNEL	=
AFLAGS_KERNEL	=
462
LDFLAGS_vmlinux =
L
Linus Torvalds 已提交
463

464 465
# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE    := \
466 467
		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
468
		-I$(srctree)/include/uapi \
469
		-I$(objtree)/include/generated/uapi \
470 471
                -include $(srctree)/include/linux/kconfig.h

L
Linus Torvalds 已提交
472 473
# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
474
LINUXINCLUDE    := \
475 476
		-I$(srctree)/arch/$(SRCARCH)/include \
		-I$(objtree)/arch/$(SRCARCH)/include/generated \
477
		$(if $(building_out_of_srctree),-I$(srctree)/include) \
478 479
		-I$(objtree)/include \
		$(USERINCLUDE)
L
Linus Torvalds 已提交
480

481
KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
482
KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
483
		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
484
		   -Werror=implicit-function-declaration -Werror=implicit-int \
485
		   -Wno-format-security \
486 487
		   -std=gnu89
KBUILD_CPPFLAGS := -D__KERNEL__
488 489
KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
490 491
KBUILD_AFLAGS_MODULE  := -DMODULE
KBUILD_CFLAGS_MODULE  := -DMODULE
492 493
KBUILD_LDFLAGS_MODULE :=
export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
494
KBUILD_LDFLAGS :=
495
GCC_PLUGINS_CFLAGS :=
496
CLANG_FLAGS :=
L
Linus Torvalds 已提交
497

M
Masahiro Yamada 已提交
498
export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
499
export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
500
export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
501
export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
L
Linus Torvalds 已提交
502

503
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
504 505
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
506
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
507
export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
508
export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
L
Linus Torvalds 已提交
509 510 511

# Files to ignore in find ... statements

512 513 514
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
J
Jesper Juhl 已提交
515 516
export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
L
Linus Torvalds 已提交
517 518 519 520

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

521
# Basic helpers built in scripts/basic/
522
PHONY += scripts_basic
L
Linus Torvalds 已提交
523 524
scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic
525
	$(Q)rm -f .tmp_quiet_recordmcount
L
Linus Torvalds 已提交
526

527
PHONY += outputmakefile
528
# Before starting out-of-tree build, make sure the source tree is clean.
529 530 531
# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
532 533
# At the same time when output Makefile generated, generate .gitignore to
# ignore whole output directory
L
Linus Torvalds 已提交
534
outputmakefile:
535
ifdef building_out_of_srctree
536 537 538 539 540 541 542 543 544
	$(Q)if [ -f $(srctree)/.config -o \
		 -d $(srctree)/include/config -o \
		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
		echo >&2 "***"; \
		echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
		echo >&2 "*** in $(abs_srctree)";\
		echo >&2 "***"; \
		false; \
	fi
545
	$(Q)ln -fsn $(srctree) source
546
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
547 548
	$(Q)test -e .gitignore || \
	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
549
endif
L
Linus Torvalds 已提交
550

M
Masahiro Yamada 已提交
551
ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
552
ifneq ($(CROSS_COMPILE),)
553
CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
554
GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
555
CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)
556
GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
557 558
endif
ifneq ($(GCC_TOOLCHAIN),)
559
CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
560
endif
561
ifneq ($(LLVM_IAS),1)
562
CLANG_FLAGS	+= -no-integrated-as
563
endif
564
CLANG_FLAGS	+= -Werror=unknown-warning-option
565 566
KBUILD_CFLAGS	+= $(CLANG_FLAGS)
KBUILD_AFLAGS	+= $(CLANG_FLAGS)
567
export CLANG_FLAGS
568 569
endif

570 571 572 573
# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
# and from include/config/auto.conf.cmd to detect the compiler upgrade.
574
CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
575

576
ifdef config-build
L
Linus Torvalds 已提交
577 578 579 580 581 582 583
# ===========================================================================
# *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'
584
include arch/$(SRCARCH)/Makefile
585
export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
L
Linus Torvalds 已提交
586

587
config: outputmakefile scripts_basic FORCE
S
Sam Ravnborg 已提交
588 589
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

590
%config: outputmakefile scripts_basic FORCE
L
Linus Torvalds 已提交
591 592
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

593
else #!config-build
L
Linus Torvalds 已提交
594 595 596 597
# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.

598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625
# If building an external module we do not care about the all: rule
# but instead _all depend on modules
PHONY += all
ifeq ($(KBUILD_EXTMOD),)
_all: all
else
_all: modules
endif

# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.

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
# make sure the checksums are up to date before we record them.

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

626
ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
627 628 629 630 631 632 633 634 635
  KBUILD_MODULES := 1
endif

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

export KBUILD_MODULES KBUILD_BUILTIN

636
ifdef need-config
637 638 639
include include/config/auto.conf
endif

L
Linus Torvalds 已提交
640 641 642
ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
643
drivers-y	:= drivers/ sound/
644
drivers-$(CONFIG_SAMPLES) += samples/
L
Linus Torvalds 已提交
645 646 647
net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
648
virt-y		:= virt/
L
Linus Torvalds 已提交
649 650
endif # KBUILD_EXTMOD

651 652 653 654 655 656 657 658 659
# 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
# Defaults to vmlinux, but the arch makefile usually adds further targets
all: vmlinux

CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
	$(call cc-option,-fno-tree-loop-im) \
	$(call cc-disable-warning,maybe-uninitialized,)
660
export CFLAGS_GCOV
661

662 663 664 665 666
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

667 668 669 670 671 672 673 674 675
RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
export RETPOLINE_CFLAGS
export RETPOLINE_VDSO_CFLAGS

676
include arch/$(SRCARCH)/Makefile
L
Linus Torvalds 已提交
677

678 679
ifdef need-config
ifdef may-sync-config
680 681 682
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
683
include include/config/auto.conf.cmd
L
Linus Torvalds 已提交
684

685 686 687 688 689 690 691 692
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" not found!'
	@echo >&2 '***'
	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
	@echo >&2 '*** "make menuconfig" or "make xconfig").'
	@echo >&2 '***'
	@/bin/false
L
Linus Torvalds 已提交
693

694 695 696
# The actual configuration files used during the build are stored in
# include/generated/ and include/config/. Update them if .config is newer than
# include/config/auto.conf (which mirrors .config).
697 698 699
#
# This exploits the 'multi-target pattern rule' trick.
# The syncconfig should be executed only once to make all the targets.
700
# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
701
%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
702
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
703
else # !may-sync-config
704 705 706
# External modules and some install targets need include/generated/autoconf.h
# and include/config/auto.conf but do not care if they are up-to-date.
# Use auto.conf to trigger the test
707 708 709
PHONY += include/config/auto.conf

include/config/auto.conf:
710
	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
M
Michal Marek 已提交
711 712 713 714 715
	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 ;							\
716 717
	/bin/false)

718
endif # may-sync-config
719
endif # need-config
L
Linus Torvalds 已提交
720

721
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
722
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
723 724
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
725
KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
726

727 728 729 730 731 732
ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
KBUILD_CFLAGS += -O2
else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
KBUILD_CFLAGS += -O3
else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
KBUILD_CFLAGS += -Os
733
endif
L
Linus Torvalds 已提交
734

735 736
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
737
KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
738

739
include scripts/Makefile.kcov
E
Emese Revfy 已提交
740 741
include scripts/Makefile.gcc-plugins

A
Andi Kleen 已提交
742 743 744 745 746 747 748 749 750 751
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

752
ifneq ($(CONFIG_FRAME_WARN),0)
753
KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
754 755
endif

756
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
757 758
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
759 760

KBUILD_CFLAGS += $(stackp-flags-y)
761

762
ifdef CONFIG_CC_IS_CLANG
763 764 765
KBUILD_CPPFLAGS += -Qunused-arguments
KBUILD_CFLAGS += -Wno-format-invalid-specifier
KBUILD_CFLAGS += -Wno-gnu
766 767 768
# 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
769
KBUILD_CFLAGS += -mno-global-merge
770 771 772 773
else

# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
774
KBUILD_CFLAGS += -Wno-unused-but-set-variable
775 776 777 778 779

# Warn about unmarked fall-throughs in switch statement.
# Disabled for clang while comment to attribute conversion happens and
# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
780 781
endif

782
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
L
Linus Torvalds 已提交
783
ifdef CONFIG_FRAME_POINTER
784
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
L
Linus Torvalds 已提交
785
else
786 787 788 789 790 791
# 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
792
KBUILD_CFLAGS	+= -fomit-frame-pointer
L
Linus Torvalds 已提交
793
endif
794
endif
L
Linus Torvalds 已提交
795

796 797 798 799 800
# Initialize all stack variables with a pattern, if desired.
ifdef CONFIG_INIT_STACK_ALL
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
endif

801
DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
802

L
Linus Torvalds 已提交
803
ifdef CONFIG_DEBUG_INFO
A
Andi Kleen 已提交
804
ifdef CONFIG_DEBUG_INFO_SPLIT
805
DEBUG_CFLAGS	+= -gsplit-dwarf
A
Andi Kleen 已提交
806
else
807
DEBUG_CFLAGS	+= -g
A
Andi Kleen 已提交
808
endif
809
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
L
Linus Torvalds 已提交
810
endif
811
ifdef CONFIG_DEBUG_INFO_DWARF4
812
DEBUG_CFLAGS	+= -gdwarf-4
813
endif
L
Linus Torvalds 已提交
814

815
ifdef CONFIG_DEBUG_INFO_REDUCED
816
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
817
		   $(call cc-option,-fno-var-tracking)
818 819
endif

820 821 822
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

823
ifdef CONFIG_FUNCTION_TRACER
824 825 826 827 828 829
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
830 831 832 833 834 835
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
836
endif
837
ifdef CONFIG_HAVE_FENTRY
838 839 840 841
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
842
endif
843 844 845
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
846
ifdef CONFIG_DYNAMIC_FTRACE
847
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
848 849 850 851
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
852 853
endif

854 855 856 857 858
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

859
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
860 861
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
862 863
endif

864 865 866 867
ifdef CONFIG_LIVEPATCH
KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
endif

868
# arch Makefile may override CC so keep this after arch Makefile is included
M
Masahiro Yamada 已提交
869
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
870

L
Linus Torvalds 已提交
871
# warn about C99 declaration after statement
872
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
Linus Torvalds 已提交
873

K
Kees Cook 已提交
874
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
875
KBUILD_CFLAGS += -Wvla
K
Kees Cook 已提交
876

S
Sam Ravnborg 已提交
877
# disable pointer signed / unsigned warnings in gcc 4.0
878
KBUILD_CFLAGS += -Wno-pointer-sign
L
Linus Torvalds 已提交
879

880 881 882
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

883 884
# We'll want to enable this eventually, but it's not going away for 5.7 at least
KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
885
KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
886
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
887

888 889 890
# Another good warning that we'll want to enable eventually
KBUILD_CFLAGS += $(call cc-disable-warning, restrict)

891 892 893
# Enabled with W=2, disabled by default as noisy
KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)

894
# disable invalid "can't wrap" optimizations for signed / pointers
895
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
896

897 898 899 900 901 902 903 904 905
# clang sets -fmerge-all-constants by default as optimization, but this
# is non-conforming behavior for C and in fact breaks the kernel, so we
# need to disable it here generally.
KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)

# for gcc -fno-merge-all-constants disables everything, but it is fine
# to have actual conforming behavior enabled.
KBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)

906 907 908
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

909 910 911
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

912 913 914
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

915 916 917
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

918 919 920
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

921 922 923
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

924 925 926 927 928 929
# ensure -fcf-protection is disabled when using retpoline as it is
# incompatible with -mindirect-branch=thunk-extern
ifdef CONFIG_RETPOLINE
KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
endif

930 931
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
932
include scripts/Makefile.ubsan
933

934 935 936 937
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS   += $(KAFLAGS)
KBUILD_CFLAGS   += $(KCFLAGS)
938

939 940
KBUILD_LDFLAGS_MODULE += --build-id
LDFLAGS_vmlinux += --build-id
R
Roland McGrath 已提交
941

942
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
943
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
944 945
endif

946 947 948 949
ifeq ($(CONFIG_RELR),y)
LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
endif

950 951 952 953
# Align the bit size of userspace programs with the kernel
KBUILD_USERCFLAGS  += $(filter -m32 -m64, $(KBUILD_CFLAGS))
KBUILD_USERLDFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS))

954 955 956
# make the checker run with the right architecture
CHECKFLAGS += --arch=$(ARCH)

957 958 959
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

960 961 962
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

L
Linus Torvalds 已提交
963
# Default kernel image to build when no specific target is given.
S
Sam Ravnborg 已提交
964
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
965 966 967 968 969 970 971 972 973 974
# 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

975 976 977 978 979 980 981
#
# 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)

L
Linus Torvalds 已提交
982 983 984
#
# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
# relocations required by build roots.  This is not defined in the
S
Sam Ravnborg 已提交
985
# makefile but the argument can be passed to make if needed.
L
Linus Torvalds 已提交
986 987
#

988
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
Linus Torvalds 已提交
989 990
export MODLIB

991
#
992 993 994 995
# 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.
996

997 998
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
999
mod_strip_cmd = $(STRIP) --strip-debug
1000
else
1001
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1002 1003
endif # INSTALL_MOD_STRIP=1
else
1004
mod_strip_cmd = true
1005 1006 1007
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

1008 1009 1010 1011 1012 1013 1014
# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
# or CONFIG_MODULE_COMPRESS_XZ.

mod_compress_cmd = true
ifdef CONFIG_MODULE_COMPRESS
  ifdef CONFIG_MODULE_COMPRESS_GZIP
1015
    mod_compress_cmd = gzip -n -f
1016 1017
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
1018
    mod_compress_cmd = xz -f
1019 1020 1021 1022
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

1023
ifdef CONFIG_MODULE_SIG_ALL
1024 1025 1026
$(eval $(call config_filename,MODULE_SIG_KEY))

mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1027 1028 1029 1030 1031
else
mod_sign_cmd = true
endif
export mod_sign_cmd

1032 1033
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

1034 1035
ifdef CONFIG_STACK_VALIDATION
  has_libelf := $(call try-run,\
1036
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1037 1038 1039 1040 1041 1042 1043 1044
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

1045
PHONY += prepare0
1046

1047
export MODORDER := $(extmod-prefix)modules.order
1048
export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1049

L
Linus Torvalds 已提交
1050
ifeq ($(KBUILD_EXTMOD),)
1051
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
Linus Torvalds 已提交
1052 1053 1054

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1055
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
L
Linus Torvalds 已提交
1056

1057 1058 1059
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
			$(drivers-) $(net-) $(libs-) $(virt-))))
L
Linus Torvalds 已提交
1060

1061
build-dirs	:= $(vmlinux-dirs)
1062
clean-dirs	:= $(vmlinux-alldirs)
1063

1064 1065 1066 1067
init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
net-y		:= $(patsubst %/, %/built-in.a, $(net-y))
1068 1069 1070 1071 1072
libs-y2		:= $(patsubst %/, %/built-in.a, $(filter %/, $(libs-y)))
ifdef CONFIG_MODULES
libs-y1		:= $(filter-out %/, $(libs-y))
libs-y2		+= $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
else
L
Linus Torvalds 已提交
1073
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
1074
endif
1075
virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
L
Linus Torvalds 已提交
1076

1077
# Externally visible symbols (used by link-vmlinux.sh)
1078 1079
export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
			      $(drivers-y) $(net-y) $(virt-y)
1080
export KBUILD_VMLINUX_LIBS := $(libs-y1)
1081
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1082
export LDFLAGS_vmlinux
1083
# used by scripts/Makefile.package
1084
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1085

1086
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1087

1088 1089
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
1090
ifdef CONFIG_TRIM_UNUSED_KSYMS
1091
autoksyms_recursive: descend modules.order
1092
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1093
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1094
endif
1095

1096 1097 1098 1099 1100 1101 1102
# For the kernel to actually contain only the needed exported symbols,
# we have to build modules as well to determine what those symbols are.
# (this can be evaluated only once include/config/auto.conf has been included)
ifdef CONFIG_TRIM_UNUSED_KSYMS
  KBUILD_MODULES := 1
endif

1103 1104
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

1105 1106 1107 1108
quiet_cmd_autoksyms_h = GEN     $@
      cmd_autoksyms_h = mkdir -p $(dir $@); \
			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@

1109
$(autoksyms_h):
1110
	$(call cmd,autoksyms_h)
1111

1112 1113 1114
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1115
cmd_link-vmlinux =                                                 \
1116
	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1117
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1118

1119
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1120
	+$(call if_changed,link-vmlinux)
1121

1122 1123
targets := vmlinux

1124
# The actual objects are generated when descending,
L
Linus Torvalds 已提交
1125
# make sure no implicit rule kicks in
1126
$(sort $(vmlinux-deps)): descend ;
L
Linus Torvalds 已提交
1127

1128
filechk_kernel.release = \
1129 1130
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

G
Geert Uytterhoeven 已提交
1131
# Store (new) KERNELRELEASE string in include/config/kernel.release
1132
include/config/kernel.release: FORCE
1133
	$(call filechk,kernel.release)
1134

1135 1136 1137 1138
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1139
scripts: scripts_basic scripts_dtc
1140
	$(Q)$(MAKE) $(build)=$(@)
1141

L
Linus Torvalds 已提交
1142
# Things we need to do before we recursively start building the kernel
1143 1144 1145 1146
# 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.
L
Linus Torvalds 已提交
1147

M
Masahiro Yamada 已提交
1148
PHONY += prepare archprepare
1149

1150
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1151 1152
	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
	include/generated/autoconf.h
1153

1154
prepare0: archprepare
1155
	$(Q)$(MAKE) $(build)=scripts/mod
1156
	$(Q)$(MAKE) $(build)=.
1157

L
Linus Torvalds 已提交
1158
# All the preparing..
1159 1160
prepare: prepare0 prepare-objtool

1161
# Support for using generic headers in asm-generic
1162 1163
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1164 1165
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1166 1167
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1168
uapi-asm-generic:
1169 1170
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1171

1172
PHONY += prepare-objtool
1173
prepare-objtool: $(objtool_target)
1174 1175 1176 1177 1178 1179 1180 1181
ifeq ($(SKIP_STACK_VALIDATION),1)
ifdef CONFIG_UNWINDER_ORC
	@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
	@false
else
	@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
endif
endif
L
Linus Torvalds 已提交
1182 1183 1184 1185 1186 1187 1188 1189

# 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
S
Sam Ravnborg 已提交
1190 1191 1192 1193 1194
define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1195
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
S
Sam Ravnborg 已提交
1196
endef
L
Linus Torvalds 已提交
1197 1198

define filechk_version.h
1199
	echo \#define LINUX_VERSION_CODE $(shell                         \
J
Jesper Juhl 已提交
1200
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1201
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
L
Linus Torvalds 已提交
1202 1203
endef

1204
$(version_h): FORCE
L
Linus Torvalds 已提交
1205
	$(call filechk,version.h)
1206
	$(Q)rm -f $(old_version_h)
L
Linus Torvalds 已提交
1207

1208
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1209 1210
	$(call filechk,utsrelease.h)

1211 1212
PHONY += headerdep
headerdep:
1213 1214
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1215

1216 1217 1218
# ---------------------------------------------------------------------------
# Kernel headers

1219 1220
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1221

1222 1223 1224 1225 1226
quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
      cmd_headers_install = \
	mkdir -p $(INSTALL_HDR_PATH); \
	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
	usr/include $(INSTALL_HDR_PATH)
1227

1228
PHONY += headers_install
1229 1230
headers_install: headers
	$(call cmd,headers_install)
1231

1232
PHONY += archheaders archscripts
1233

1234
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1235

1236 1237
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1238
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1239
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1240 1241
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1242

1243
# Deprecated. It is no-op now.
1244
PHONY += headers_check
1245 1246
headers_check:
	@:
1247

1248
ifdef CONFIG_HEADERS_INSTALL
1249
prepare: headers
1250
endif
1251

1252 1253 1254 1255
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1256 1257 1258 1259 1260
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1261
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1262

1263 1264
kselftest-%: FORCE
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
W
Wang Long 已提交
1265

1266 1267 1268
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1269 1270
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1271
	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1272

1273 1274 1275 1276 1277 1278 1279 1280 1281
# ---------------------------------------------------------------------------
# Devicetree files

ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
dtstree := arch/$(SRCARCH)/boot/dts
endif

ifneq ($(dtstree),)

M
Masahiro Yamada 已提交
1282
%.dtb: include/config/kernel.release scripts_dtc
1283 1284
	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

1285
PHONY += dtbs dtbs_install dtbs_check
1286
dtbs: include/config/kernel.release scripts_dtc
1287 1288
	$(Q)$(MAKE) $(build)=$(dtstree)

1289
ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1290
export CHECK_DTBS=y
1291 1292 1293 1294
dtbs: dt_binding_check
endif

dtbs_check: dtbs
1295

1296
dtbs_install:
1297
	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308

ifdef CONFIG_OF_EARLY_FLATTREE
all: dtbs
endif

endif

PHONY += scripts_dtc
scripts_dtc: scripts_basic
	$(Q)$(MAKE) $(build)=scripts/dtc

1309 1310 1311 1312
ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
export CHECK_DT_BINDING=y
endif

1313
PHONY += dt_binding_check
1314 1315 1316
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

L
Linus Torvalds 已提交
1317 1318 1319 1320 1321
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
Sam Ravnborg 已提交
1322
# By default, build modules as well
L
Linus Torvalds 已提交
1323

1324
all: modules
L
Linus Torvalds 已提交
1325

1326
# Build modules
T
Tejun Heo 已提交
1327
#
1328 1329 1330
# 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.
L
Linus Torvalds 已提交
1331

1332
PHONY += modules
1333
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order
S
Sam Ravnborg 已提交
1334
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1335
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
L
Linus Torvalds 已提交
1336

1337 1338
modules.order: descend
	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1339

L
Linus Torvalds 已提交
1340
# Target to prepare building external modules
1341
PHONY += modules_prepare
1342
modules_prepare: prepare
L
Linus Torvalds 已提交
1343 1344

# Target to install modules
1345
PHONY += modules_install
L
Linus Torvalds 已提交
1346 1347
modules_install: _modinst_ _modinst_post

1348
PHONY += _modinst_
1349
_modinst_:
L
Linus Torvalds 已提交
1350 1351 1352
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1353
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
Linus Torvalds 已提交
1354 1355
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1356
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1357
	fi
1358
	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1359
	@cp -f modules.builtin $(MODLIB)/
1360
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
S
Sam Ravnborg 已提交
1361
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1362

1363
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1364 1365
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1366
PHONY += _modinst_post
1367
_modinst_post: _modinst_
1368
	$(call cmd,depmod)
L
Linus Torvalds 已提交
1369

J
Josh Boyer 已提交
1370 1371 1372 1373 1374 1375
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

L
Linus Torvalds 已提交
1376 1377 1378 1379 1380
else # CONFIG_MODULES

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

1381 1382
PHONY += modules modules_install
modules modules_install:
M
Michal Marek 已提交
1383 1384 1385 1386 1387
	@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
L
Linus Torvalds 已提交
1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399
	@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'
1400 1401
CLEAN_FILES += include/ksym \
	       modules.builtin modules.builtin.modinfo modules.nsdeps
L
Linus Torvalds 已提交
1402 1403

# Directories & files removed with 'make mrproper'
1404
MRPROPER_FILES += include/config include/generated          \
1405
		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
1406 1407
		  debian snap tar-install \
		  .config .config.old .version \
1408
		  Module.symvers \
1409 1410
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
1411 1412
		  signing_key.x509.signer vmlinux-gdb.py \
		  *.spec
L
Linus Torvalds 已提交
1413

1414 1415 1416
# Directories & files removed with 'make distclean'
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS

L
Linus Torvalds 已提交
1417 1418 1419 1420
# clean - Delete most, but leave enough to build external modules
#
clean: rm-files := $(CLEAN_FILES)

1421
PHONY += archclean vmlinuxclean
L
Linus Torvalds 已提交
1422

1423 1424
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1425
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1426 1427

clean: archclean vmlinuxclean
L
Linus Torvalds 已提交
1428 1429 1430 1431

# mrproper - Delete all generated files, including .config
#
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1432
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
Linus Torvalds 已提交
1433

1434
PHONY += $(mrproper-dirs) mrproper
L
Linus Torvalds 已提交
1435 1436 1437
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1438
mrproper: clean $(mrproper-dirs)
L
Linus Torvalds 已提交
1439 1440 1441 1442
	$(call cmd,rmfiles)

# distclean
#
1443 1444
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))

1445
PHONY += distclean
L
Linus Torvalds 已提交
1446 1447

distclean: mrproper
1448
	$(call cmd,rmfiles)
L
Linus Torvalds 已提交
1449
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1450
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1451 1452
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
Linus Torvalds 已提交
1453 1454 1455 1456 1457 1458
		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------

1459
%src-pkg: FORCE
1460
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1461
%pkg: include/config/kernel.release FORCE
1462
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
L
Linus Torvalds 已提交
1463 1464 1465 1466

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

1467
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1468
boards := $(sort $(notdir $(boards)))
1469 1470
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
Linus Torvalds 已提交
1471

1472
PHONY += help
L
Linus Torvalds 已提交
1473 1474
help:
	@echo  'Cleaning targets:'
1475
	@echo  '  clean		  - Remove most generated files but keep the config and'
1476
	@echo  '                    enough build support to build external modules'
1477
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1478
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
Linus Torvalds 已提交
1479 1480 1481 1482 1483 1484 1485 1486
	@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'
1487
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1488
	@echo  '  dir/            - Build all files in dir and below'
1489
	@echo  '  dir/file.[ois]  - Build specified target only'
1490 1491
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1492 1493
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1494
	@echo  '  dir/file.ko     - Build module including final link'
1495
	@echo  '  modules_prepare - Set up for building external modules'
L
Linus Torvalds 已提交
1496 1497
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1498
	@echo  '  gtags           - Generate GNU GLOBAL index'
1499 1500 1501
	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
	@echo  '  image_name	  - Output the image name (use with make -s)'
1502
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1503
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1504
	 echo  ''
R
Randy Dunlap 已提交
1505
	@echo  'Static analysers:'
L
Linus Torvalds 已提交
1506 1507
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1508
	@echo  '  versioncheck    - Sanity check on version.h usage'
1509
	@echo  '  includecheck    - Check for duplicate included header files'
1510
	@echo  '  export_report   - List the usages of all exported symbols'
1511
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1512
	@echo  '  coccicheck      - Check with Coccinelle'
1513
	@echo  ''
1514 1515 1516
	@echo  'Tools:'
	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
	@echo  ''
R
Randy Dunlap 已提交
1517
	@echo  'Kernel selftest:'
1518 1519 1520 1521 1522 1523 1524 1525 1526
	@echo  '  kselftest         - Build and run kernel selftest'
	@echo  '                      Build, install, and boot kernel before'
	@echo  '                      running kselftest on it'
	@echo  '                      Run as root for full coverage'
	@echo  '  kselftest-all     - Build kernel selftest'
	@echo  '  kselftest-install - Build and install kernel selftest'
	@echo  '  kselftest-clean   - Remove all generated kselftest files'
	@echo  '  kselftest-merge   - Merge all the config dependencies of'
	@echo  '		      kselftest to existing .config.'
1527
	@echo  ''
1528 1529
	@$(if $(dtstree), \
		echo 'Devicetree:'; \
1530 1531 1532 1533
		echo '* dtbs             - Build device tree blobs for enabled boards'; \
		echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
		echo '  dt_binding_check - Validate device tree binding documents'; \
		echo '  dtbs_check       - Validate device tree source files';\
1534 1535
		echo '')

R
Randy Dunlap 已提交
1536 1537 1538 1539
	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
Linus Torvalds 已提交
1540
	@echo  'Kernel packaging:'
1541
	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
L
Linus Torvalds 已提交
1542 1543
	@echo  ''
	@echo  'Documentation targets:'
1544
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
Linus Torvalds 已提交
1545
	@echo  ''
1546
	@echo  'Architecture specific targets ($(SRCARCH)):'
L
Linus Torvalds 已提交
1547
	@$(if $(archhelp),$(archhelp),\
1548
		echo '  No architecture specific help defined for $(SRCARCH)')
L
Linus Torvalds 已提交
1549 1550 1551
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
1552
		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
L
Linus Torvalds 已提交
1553
		echo '')
1554 1555 1556 1557 1558
	@$(if $(board-dirs), \
		$(foreach b, $(board-dirs), \
		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
		printf "  %-16s - Show all of the above\\n" help-boards; \
		echo '')
L
Linus Torvalds 已提交
1559 1560

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1561
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
Linus Torvalds 已提交
1562
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1563 1564
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
	@echo  '                       (sparse by default)'
1565
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1566
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1567
	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1568 1569 1570
	@echo  '		1: warnings which may be relevant and do not occur too often'
	@echo  '		2: warnings which occur quite often but may still be relevant'
	@echo  '		3: more obscure warnings, can most likely be ignored'
1571
	@echo  '		Multiple levels can be combined with W=12 or W=123'
L
Linus Torvalds 已提交
1572 1573 1574 1575 1576
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1577 1578 1579 1580
help-board-dirs := $(addprefix help-,$(board-dirs))

help-boards: $(help-board-dirs)

1581
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1582 1583 1584 1585 1586 1587 1588 1589 1590

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(SRCARCH) $*):'
	@$(if $(boards-per-dir), \
		$(foreach b, $(boards-per-dir), \
		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
		echo '')


L
Linus Torvalds 已提交
1591 1592
# Documentation targets
# ---------------------------------------------------------------------------
1593 1594
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1595
PHONY += $(DOC_TARGETS)
1596
$(DOC_TARGETS):
1597
	$(Q)$(MAKE) $(build)=Documentation $@
L
Linus Torvalds 已提交
1598

1599 1600 1601 1602
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1603
scripts_gdb: prepare0
1604
	$(Q)$(MAKE) $(build)=scripts/gdb
1605
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1606 1607 1608 1609 1610

ifdef CONFIG_GDB_SCRIPTS
all: scripts_gdb
endif

L
Linus Torvalds 已提交
1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626
else # KBUILD_EXTMOD

###
# External module support.
# When building external modules the kernel used as basis is considered
# read-only, and no consistency checks are made and the make
# system is not used on the basis kernel. If updates are required
# in the basis kernel ordinary make commands (without M=...) must
# be used.
#
# The following are the only valid targets when building external
# modules.
# make M=dir clean     Delete all automatically generated files
# make M=dir modules   Make all modules in specified dir
# make M=dir	       Same as 'make M=dir modules'
# make M=dir modules_install
S
Sam Ravnborg 已提交
1627
#                      Install the modules built in the module directory
L
Linus Torvalds 已提交
1628 1629 1630 1631 1632
#                      Assumes install directory is already created

# We are always building modules
KBUILD_MODULES := 1

1633
PHONY += $(objtree)/Module.symvers
L
Linus Torvalds 已提交
1634 1635 1636 1637 1638 1639 1640
$(objtree)/Module.symvers:
	@test -e $(objtree)/Module.symvers || ( \
	echo; \
	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
	echo "           is missing; modules will have no dependencies and modversions."; \
	echo )

1641 1642 1643
build-dirs := $(KBUILD_EXTMOD)
PHONY += modules
modules: descend $(objtree)/Module.symvers
S
Sam Ravnborg 已提交
1644
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
Linus Torvalds 已提交
1645

1646
PHONY += modules_install
1647
modules_install: _emodinst_ _emodinst_post
1648

1649 1650
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1651 1652
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
S
Sam Ravnborg 已提交
1653
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1654

1655
PHONY += _emodinst_post
1656 1657 1658
_emodinst_post: _emodinst_
	$(call cmd,depmod)

1659
clean-dirs := $(KBUILD_EXTMOD)
1660
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
L
Linus Torvalds 已提交
1661

1662
PHONY += help
L
Linus Torvalds 已提交
1663 1664 1665 1666 1667 1668 1669 1670
help:
	@echo  '  Building external modules.'
	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
	@echo  ''
	@echo  '  modules         - default target, build the module(s)'
	@echo  '  modules_install - install the module'
	@echo  '  clean           - remove generated files in module directory only'
	@echo  ''
1671

1672
PHONY += prepare
L
Linus Torvalds 已提交
1673 1674
endif # KBUILD_EXTMOD

1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718
# Single targets
# ---------------------------------------------------------------------------
# To build individual files in subdirectories, you can do like this:
#
#   make foo/bar/baz.s
#
# The supported suffixes for single-target are listed in 'single-targets'
#
# To build only under specific subdirectories, you can do like this:
#
#   make foo/bar/baz/

ifdef single-build

# .ko is special because modpost is needed
single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))

$(single-ko): single_modpost
	@:
$(single-no-ko): descend
	@:

ifeq ($(KBUILD_EXTMOD),)
# For the single build of in-tree modules, use a temporary file to avoid
# the situation of modules_install installing an invalid modules.order.
MODORDER := .modules.tmp
endif

PHONY += single_modpost
single_modpost: $(single-no-ko)
	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost

KBUILD_MODULES := 1

export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))

# trim unrelated directories
build-dirs := $(foreach d, $(build-dirs), \
			$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))

endif

1719 1720 1721 1722 1723 1724 1725 1726
# Handle descending into subdirectories listed in $(build-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
PHONY += descend $(build-dirs)
descend: $(build-dirs)
$(build-dirs): prepare
1727
	$(Q)$(MAKE) $(build)=$@ \
1728
	single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1729
	need-builtin=1 need-modorder=1
1730

1731 1732 1733 1734 1735
clean-dirs := $(addprefix _clean_, $(clean-dirs))
PHONY += $(clean-dirs) clean
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1736 1737
clean: $(clean-dirs)
	$(call cmd,rmfiles)
1738
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1739
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1740 1741
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1742
		-o -name '*.dwo' -o -name '*.lst' \
1743
		-o -name '*.su' -o -name '*.mod' \
1744
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1745
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1746
		-o -name '*.asn1.[ch]' \
1747
		-o -name '*.symtypes' -o -name 'modules.order' \
1748
		-o -name '.tmp_*.o.*' \
E
Emese Revfy 已提交
1749
		-o -name '*.c.[012]*.*' \
1750
		-o -name '*.ll' \
1751 1752
		-o -name '*.gcno' \) -type f -print | xargs rm -f

L
Linus Torvalds 已提交
1753 1754
# Generate tags for editors
# ---------------------------------------------------------------------------
1755
quiet_cmd_tags = GEN     $@
1756
      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
L
Linus Torvalds 已提交
1757

1758
tags TAGS cscope gtags: FORCE
L
Linus Torvalds 已提交
1759 1760
	$(call cmd,tags)

1761 1762 1763 1764
# Script to generate missing namespace dependencies
# ---------------------------------------------------------------------------

PHONY += nsdeps
1765
nsdeps: export KBUILD_NSDEPS=1
1766
nsdeps: modules
1767
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1768

L
Linus Torvalds 已提交
1769 1770 1771
# Scripts to check various things for consistency
# ---------------------------------------------------------------------------

P
Peter Foley 已提交
1772 1773
PHONY += includecheck versioncheck coccicheck namespacecheck export_report

L
Linus Torvalds 已提交
1774
includecheck:
1775
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
Linus Torvalds 已提交
1776
		-name '*.[hcS]' -type f -print | sort \
1777
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
L
Linus Torvalds 已提交
1778 1779

versioncheck:
1780
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
Linus Torvalds 已提交
1781
		-name '*.[hcS]' -type f -print | sort \
1782
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
L
Linus Torvalds 已提交
1783

1784
coccicheck:
1785
	$(Q)$(BASH) $(srctree)/scripts/$@
1786

L
Linus Torvalds 已提交
1787 1788 1789
namespacecheck:
	$(PERL) $(srctree)/scripts/namespace.pl

1790 1791 1792
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1793
PHONY += checkstack kernelrelease kernelversion image_name
J
Jeff Dike 已提交
1794

J
Jeff Dike 已提交
1795 1796 1797 1798 1799 1800 1801 1802 1803
# UML needs a little special treatment here.  It wants to use the host
# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
# else wants $(ARCH), including people doing cross-builds, which means
# that $(SUBARCH) doesn't work here.
ifeq ($(ARCH), um)
CHECKSTACK_ARCH := $(SUBARCH)
else
CHECKSTACK_ARCH := $(ARCH)
endif
L
Linus Torvalds 已提交
1804 1805
checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1806
	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
L
Linus Torvalds 已提交
1807

1808 1809
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1810

1811
kernelversion:
1812
	@echo $(KERNELVERSION)
L
Linus Torvalds 已提交
1813

1814 1815 1816
image_name:
	@echo $(KBUILD_IMAGE)

1817
# Clear a bunch of variables before executing the submake
1818 1819 1820 1821 1822

ifeq ($(quiet),silent_)
tools_silent=s
endif

1823
tools/: FORCE
1824
	$(Q)mkdir -p $(objtree)/tools
1825
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1826 1827

tools/%: FORCE
1828
	$(Q)mkdir -p $(objtree)/tools
1829
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1830

L
Linus Torvalds 已提交
1831
quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1832
      cmd_rmfiles = rm -rf $(rm-files)
L
Linus Torvalds 已提交
1833

1834
# Run depmod only if we have System.map and depmod is executable
1835
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
M
Michal Marek 已提交
1836
      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1837
                   $(KERNELRELEASE)
1838

1839 1840
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
L
Linus Torvalds 已提交
1841

1842
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
L
Linus Torvalds 已提交
1843

1844
endif # config-build
1845 1846
endif # mixed-build
endif # need-sub-make
L
Linus Torvalds 已提交
1847

1848
PHONY += FORCE
L
Linus Torvalds 已提交
1849
FORCE:
1850

1851
# Declare the contents of the PHONY variable as phony.  We keep that
1852
# information in a variable so we can use it in if_changed and friends.
1853
.PHONY: $(PHONY)