Makefile 59.5 KB
Newer Older
1
# SPDX-License-Identifier: GPL-2.0
L
Linus Torvalds 已提交
2
VERSION = 4
L
Linus Torvalds 已提交
3
PATCHLEVEL = 20
L
Linus Torvalds 已提交
4
SUBLEVEL = 0
L
Linus Torvalds 已提交
5
EXTRAVERSION = -rc2
G
Greg Kroah-Hartman 已提交
6
NAME = "People's Front"
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:

18 19 20
# Do not use make's built-in rules and variables
# (this increases performance and avoids hard-to-debug behaviour)
MAKEFLAGS += -rR
L
Linus Torvalds 已提交
21

22
# Avoid funny character set dependencies
23
unexport LC_ALL
24 25
LC_COLLATE=C
LC_NUMERIC=C
26
export LC_COLLATE LC_NUMERIC
27

28 29 30
# Avoid interference with shell env settings
unexport GREP_OPTIONS

L
Linus Torvalds 已提交
31 32 33 34 35 36
# 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
37
# unavoidable when linking the built-in.a targets which finally
L
Linus Torvalds 已提交
38 39 40 41 42 43 44 45 46
# 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.

47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
# 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.
#
L
Linus Torvalds 已提交
70 71 72
# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands

73 74
ifeq ("$(origin V)", "command line")
  KBUILD_VERBOSE = $(V)
L
Linus Torvalds 已提交
75 76 77 78 79
endif
ifndef KBUILD_VERBOSE
  KBUILD_VERBOSE = 0
endif

80 81 82 83 84 85 86 87 88 89 90
ifeq ($(KBUILD_VERBOSE),1)
  quiet =
  Q =
else
  quiet=quiet_
  Q = @
endif

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

91
ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
92
  quiet=silent_
93
  tools_silent=s
94 95 96 97
endif

export quiet Q KBUILD_VERBOSE

L
Linus Torvalds 已提交
98 99 100 101 102
# 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/"
S
Sam Ravnborg 已提交
103
#
L
Linus Torvalds 已提交
104 105 106 107 108 109 110 111 112
# 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.

C
Cao jin 已提交
113 114
# KBUILD_SRC is not intended to be used by the regular user (for now),
# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
L
Linus Torvalds 已提交
115 116 117 118
ifeq ($(KBUILD_SRC),)

# OK, Make called in directory where kernel src resides
# Do we want to locate output files in a separate directory?
119 120
ifeq ("$(origin O)", "command line")
  KBUILD_OUTPUT := $(O)
L
Linus Torvalds 已提交
121 122
endif

123 124 125
# Cancel implicit rules on top Makefile
$(CURDIR)/Makefile Makefile: ;

126 127 128 129
ifneq ($(words $(subst :, ,$(CURDIR))), 1)
  $(error main directory cannot contain spaces nor colons)
endif

L
Linus Torvalds 已提交
130 131 132
ifneq ($(KBUILD_OUTPUT),)
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
133
KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
B
Bjørn Forsman 已提交
134
								&& pwd)
L
Linus Torvalds 已提交
135
$(if $(KBUILD_OUTPUT),, \
136
     $(error failed to create output directory "$(saved-output)"))
L
Linus Torvalds 已提交
137

138 139 140 141 142 143 144
# Look for make include files relative to root of kernel src
#
# This does not become effective immediately because MAKEFLAGS is re-parsed
# once after the Makefile is read.  It is OK since we are going to invoke
# 'sub-make' below.
MAKEFLAGS += --include-dir=$(CURDIR)

145 146
PHONY += $(MAKECMDGOALS) sub-make

147
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
148
	@:
149

C
Cao jin 已提交
150
# Invoke a second make in the output directory, passing relevant variables
151
sub-make:
152
	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
153
	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
L
Linus Torvalds 已提交
154 155 156 157 158 159 160 161 162

# 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),)

163 164 165 166 167
# 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

168 169 170 171 172 173 174
# 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
175 176
# See the file "Documentation/dev-tools/sparse.rst" for more details,
# including where to get the "sparse" utility.
177 178 179 180 181 182 183 184 185 186 187 188

ifeq ("$(origin C)", "command line")
  KBUILD_CHECKSRC = $(C)
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
189 190 191 192
  $(warning ================= WARNING ================)
  $(warning 'SUBDIRS' will be removed after Linux 5.3)
  $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
  $(warning ==========================================)
193 194 195 196 197 198 199
  KBUILD_EXTMOD ?= $(SUBDIRS)
endif

ifeq ("$(origin M)", "command line")
  KBUILD_EXTMOD := $(M)
endif

200 201 202 203 204 205 206 207 208 209 210
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
211 212 213

export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC

214
objtree		:= .
L
Linus Torvalds 已提交
215 216 217
src		:= $(srctree)
obj		:= $(objtree)

218
VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
L
Linus Torvalds 已提交
219

220
export srctree objtree VPATH
L
Linus Torvalds 已提交
221

222 223 224 225 226 227 228 229 230 231 232
# 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

233 234
clean-targets := %clean mrproper cleandocs
no-dot-config-targets := $(clean-targets) \
235 236
			 cscope gtags TAGS tags help% %docs check% coccicheck \
			 $(version_h) headers_% archheaders archscripts \
237
			 %asm-generic kernelversion %src-pkg
238 239
no-sync-config-targets := $(no-dot-config-targets) install %install \
			   kernelrelease
240

241 242 243 244
config-targets  := 0
mixed-targets   := 0
dot-config      := 1
may-sync-config := 1
245 246 247 248 249 250 251

ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
		dot-config := 0
	endif
endif

252 253 254 255 256 257 258 259 260 261
ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
		may-sync-config := 0
	endif
endif

ifneq ($(KBUILD_EXTMOD),)
	may-sync-config := 0
endif

262 263 264 265 266 267 268 269
ifeq ($(KBUILD_EXTMOD),)
        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
                config-targets := 1
                ifneq ($(words $(MAKECMDGOALS)),1)
                        mixed-targets := 1
                endif
        endif
endif
270 271 272 273 274 275 276 277

# For "make -j clean all", "make -j mrproper defconfig all", etc.
ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
                mixed-targets := 1
        endif
endif

278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311
# install and modules_install need also be processed one by one
ifneq ($(filter install,$(MAKECMDGOALS)),)
        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
	        mixed-targets := 1
        endif
endif

ifeq ($(mixed-targets),1)
# ===========================================================================
# 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

else

# We need some generic definitions (do not try to remake the file).
scripts/Kbuild.include: ;
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

312
include scripts/subarch.include
L
Linus Torvalds 已提交
313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331

# 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
332
ARCH		?= $(SUBARCH)
L
Linus Torvalds 已提交
333 334

# Architecture as present in compile.h
335 336
UTS_MACHINE 	:= $(ARCH)
SRCARCH 	:= $(ARCH)
L
Linus Torvalds 已提交
337

338 339 340 341 342 343 344
# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
        SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
        SRCARCH := x86
endif
345

S
Sam Ravnborg 已提交
346
# Additional ARCH settings for sparc
N
Namhyung Kim 已提交
347 348 349
ifeq ($(ARCH),sparc32)
       SRCARCH := sparc
endif
350
ifeq ($(ARCH),sparc64)
S
Sam Ravnborg 已提交
351
       SRCARCH := sparc
352
endif
353

354 355 356 357 358
# Additional ARCH settings for sh
ifeq ($(ARCH),sh64)
       SRCARCH := sh
endif

R
Roman Zippel 已提交
359
KCONFIG_CONFIG	?= .config
360
export KCONFIG_CONFIG
R
Roman Zippel 已提交
361

L
Linus Torvalds 已提交
362 363 364 365 366
# 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)

367 368 369
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)
370

S
Sam Ravnborg 已提交
371 372
HOSTCC       = gcc
HOSTCXX      = g++
373
KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
374 375 376 377 378
		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
		$(HOSTCFLAGS)
KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
L
Linus Torvalds 已提交
379 380 381 382 383 384 385 386 387 388 389

# 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
390 391
LEX		= flex
YACC		= bison
L
Linus Torvalds 已提交
392 393
AWK		= awk
GENKSYMS	= scripts/genksyms/genksyms
394
INSTALLKERNEL  := installkernel
L
Linus Torvalds 已提交
395 396
DEPMOD		= /sbin/depmod
PERL		= perl
397
PYTHON		= python
398 399
PYTHON2		= python2
PYTHON3		= python3
L
Linus Torvalds 已提交
400 401
CHECK		= sparse

402
CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
403
		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
404
NOSTDINC_FLAGS  =
405 406 407
CFLAGS_MODULE   =
AFLAGS_MODULE   =
LDFLAGS_MODULE  =
L
Linus Torvalds 已提交
408 409
CFLAGS_KERNEL	=
AFLAGS_KERNEL	=
410
LDFLAGS_vmlinux =
L
Linus Torvalds 已提交
411

412 413
# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE    := \
414 415
		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
416
		-I$(srctree)/include/uapi \
417
		-I$(objtree)/include/generated/uapi \
418 419
                -include $(srctree)/include/linux/kconfig.h

L
Linus Torvalds 已提交
420 421
# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
422
LINUXINCLUDE    := \
423 424
		-I$(srctree)/arch/$(SRCARCH)/include \
		-I$(objtree)/arch/$(SRCARCH)/include/generated \
425
		$(if $(KBUILD_SRC), -I$(srctree)/include) \
426 427
		-I$(objtree)/include \
		$(USERINCLUDE)
L
Linus Torvalds 已提交
428

429
KBUILD_AFLAGS   := -D__ASSEMBLY__
430
KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
431
		   -fno-strict-aliasing -fno-common -fshort-wchar \
432
		   -Werror-implicit-function-declaration \
433
		   -Wno-format-security \
434 435
		   -std=gnu89
KBUILD_CPPFLAGS := -D__KERNEL__
436 437
KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
438 439 440
KBUILD_AFLAGS_MODULE  := -DMODULE
KBUILD_CFLAGS_MODULE  := -DMODULE
KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
441
KBUILD_LDFLAGS :=
442
GCC_PLUGINS_CFLAGS :=
L
Linus Torvalds 已提交
443

444
export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
445
export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
446
export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
447
export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
L
Linus Torvalds 已提交
448

449
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
450 451
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
452
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
453
export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
454
export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
455
export KBUILD_ARFLAGS
L
Linus Torvalds 已提交
456 457 458 459 460 461 462 463

# 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

464 465 466
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
467 468
export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
L
Linus Torvalds 已提交
469 470 471 472

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

473
# Basic helpers built in scripts/basic/
474
PHONY += scripts_basic
L
Linus Torvalds 已提交
475 476
scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic
477
	$(Q)rm -f .tmp_quiet_recordmcount
L
Linus Torvalds 已提交
478

479 480 481
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

482
PHONY += outputmakefile
483 484 485
# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
L
Linus Torvalds 已提交
486
outputmakefile:
487
ifneq ($(KBUILD_SRC),)
488
	$(Q)ln -fsn $(srctree) source
489
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
490
endif
L
Linus Torvalds 已提交
491

M
Masahiro Yamada 已提交
492
ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
493
ifneq ($(CROSS_COMPILE),)
494
CLANG_FLAGS	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
495
GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
496
CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)
497
GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
498 499
endif
ifneq ($(GCC_TOOLCHAIN),)
500
CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
501
endif
502 503 504
CLANG_FLAGS	+= -no-integrated-as
KBUILD_CFLAGS	+= $(CLANG_FLAGS)
KBUILD_AFLAGS	+= $(CLANG_FLAGS)
505
export CLANG_FLAGS
506 507
endif

508
RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
509
RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
510
RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
511
RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
512
RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
513
RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
514
export RETPOLINE_CFLAGS
515
export RETPOLINE_VDSO_CFLAGS
516

517 518 519
KBUILD_CFLAGS	+= $(call cc-option,-fno-PIE)
KBUILD_AFLAGS	+= $(call cc-option,-fno-PIE)

P
Peter Zijlstra 已提交
520
# check for 'asm goto'
M
Masahiro Yamada 已提交
521
ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
P
Peter Zijlstra 已提交
522 523 524 525 526
  CC_HAVE_ASM_GOTO := 1
  KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
  KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
endif

527 528 529 530 531 532
# 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.
CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)

L
Linus Torvalds 已提交
533 534 535 536 537 538 539 540
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'
541
include arch/$(SRCARCH)/Makefile
542
export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
L
Linus Torvalds 已提交
543

S
Sam Ravnborg 已提交
544 545 546 547
config: scripts_basic outputmakefile FORCE
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

%config: scripts_basic outputmakefile FORCE
L
Linus Torvalds 已提交
548 549 550 551 552 553 554
	$(Q)$(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.

555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592
# 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

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

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

export KBUILD_MODULES KBUILD_BUILTIN

L
Linus Torvalds 已提交
593 594 595
ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
596
drivers-y	:= drivers/ sound/ firmware/
L
Linus Torvalds 已提交
597 598 599
net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
600
virt-y		:= virt/
L
Linus Torvalds 已提交
601 602 603
endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
604
include include/config/auto.conf
605 606 607 608 609 610 611 612 613 614 615
endif

# 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,)
616
export CFLAGS_GCOV
617

618 619 620 621 622
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

623 624 625 626 627 628
# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
# values of the respective KBUILD_* variables
ARCH_CPPFLAGS :=
ARCH_AFLAGS :=
ARCH_CFLAGS :=
include arch/$(SRCARCH)/Makefile
L
Linus Torvalds 已提交
629

630
ifeq ($(dot-config),1)
631
ifeq ($(may-sync-config),1)
632 633 634
# 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.
R
Roman Zippel 已提交
635
-include include/config/auto.conf.cmd
L
Linus Torvalds 已提交
636 637

# To avoid any implicit rule to kick in, define an empty command
R
Roman Zippel 已提交
638
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
L
Linus Torvalds 已提交
639

640 641 642
# 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).
M
Michal Marek 已提交
643
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
644
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
645
else
646 647 648
# 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
649 650 651
PHONY += include/config/auto.conf

include/config/auto.conf:
652
	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
M
Michal Marek 已提交
653 654 655 656 657
	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 ;							\
658 659
	/bin/false)

660
endif # may-sync-config
661
endif # $(dot-config)
L
Linus Torvalds 已提交
662

663
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
664
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
665 666 667
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
KBUILD_CFLAGS	+= $(call cc-disable-warning, int-in-bool-context)
668

L
Linus Torvalds 已提交
669
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
670 671
KBUILD_CFLAGS	+= $(call cc-option,-Oz,-Os)
KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
L
Linus Torvalds 已提交
672
else
673
ifdef CONFIG_PROFILE_ALL_BRANCHES
674
KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)
675 676 677
else
KBUILD_CFLAGS   += -O2
endif
L
Linus Torvalds 已提交
678 679
endif

680 681 682
KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
			$(call cc-disable-warning,maybe-uninitialized,))

683 684 685
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

686
include scripts/Makefile.kcov
E
Emese Revfy 已提交
687 688
include scripts/Makefile.gcc-plugins

A
Andi Kleen 已提交
689 690 691 692 693 694 695 696 697 698
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

699
ifneq ($(CONFIG_FRAME_WARN),0)
700 701 702
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

703
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
704 705
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
706 707

KBUILD_CFLAGS += $(stackp-flags-y)
708

709
ifdef CONFIG_CC_IS_CLANG
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724
KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
# 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,)
KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
else

# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
725
KBUILD_CFLAGS += -Wno-unused-but-set-variable
726 727
endif

728
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
L
Linus Torvalds 已提交
729
ifdef CONFIG_FRAME_POINTER
730
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
L
Linus Torvalds 已提交
731
else
732 733 734 735 736 737
# 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
738
KBUILD_CFLAGS	+= -fomit-frame-pointer
L
Linus Torvalds 已提交
739
endif
740
endif
L
Linus Torvalds 已提交
741

742 743
KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)

L
Linus Torvalds 已提交
744
ifdef CONFIG_DEBUG_INFO
A
Andi Kleen 已提交
745 746 747
ifdef CONFIG_DEBUG_INFO_SPLIT
KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
else
748
KBUILD_CFLAGS	+= -g
A
Andi Kleen 已提交
749
endif
750
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
L
Linus Torvalds 已提交
751
endif
752 753 754
ifdef CONFIG_DEBUG_INFO_DWARF4
KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
endif
L
Linus Torvalds 已提交
755

756
ifdef CONFIG_DEBUG_INFO_REDUCED
757 758
KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
		   $(call cc-option,-fno-var-tracking)
759 760
endif

761
ifdef CONFIG_FUNCTION_TRACER
762 763 764 765 766 767
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
768 769 770 771 772 773
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
774
endif
775
ifdef CONFIG_HAVE_FENTRY
776 777 778 779
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
780
endif
781 782 783
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
784
ifdef CONFIG_DYNAMIC_FTRACE
785
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
786 787 788 789
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
790 791
endif

792 793 794 795 796
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

797
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
798 799
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
800 801
endif

802
# arch Makefile may override CC so keep this after arch Makefile is included
M
Masahiro Yamada 已提交
803
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
804

L
Linus Torvalds 已提交
805
# warn about C99 declaration after statement
806
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
Linus Torvalds 已提交
807

K
Kees Cook 已提交
808 809 810
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
KBUILD_CFLAGS += $(call cc-option,-Wvla)

S
Sam Ravnborg 已提交
811
# disable pointer signed / unsigned warnings in gcc 4.0
812
KBUILD_CFLAGS += -Wno-pointer-sign
L
Linus Torvalds 已提交
813

814 815 816
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

817
# disable invalid "can't wrap" optimizations for signed / pointers
818
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
819

820 821 822 823 824 825 826 827 828
# 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)

829 830 831
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

832 833 834
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

835 836 837 838 839 840
# 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)

841 842 843
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

844 845 846
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

847 848 849
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

850 851 852
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

853 854 855
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

856 857
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
858
include scripts/Makefile.ubsan
859

860 861 862 863 864
# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
# last assignments
KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
865

R
Roland McGrath 已提交
866
# Use --build-id when available.
867
LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
868
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
R
Roland McGrath 已提交
869 870
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

871
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
872
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
873 874
endif

875 876 877
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

878 879 880
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

L
Linus Torvalds 已提交
881
# Default kernel image to build when no specific target is given.
S
Sam Ravnborg 已提交
882
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
883 884 885 886 887 888 889 890 891 892
# 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

893 894 895 896 897 898 899
#
# 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
900 901 902
#
# 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
903
# makefile but the argument can be passed to make if needed.
L
Linus Torvalds 已提交
904 905
#

906
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
Linus Torvalds 已提交
907 908
export MODLIB

909
#
910 911 912 913
# 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.
914

915 916
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
917
mod_strip_cmd = $(STRIP) --strip-debug
918
else
919
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
920 921
endif # INSTALL_MOD_STRIP=1
else
922
mod_strip_cmd = true
923 924 925
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

926 927 928 929 930 931 932
# 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
933
    mod_compress_cmd = gzip -n -f
934 935
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
936
    mod_compress_cmd = xz -f
937 938 939 940
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

941 942 943
# Select initial ramdisk compression format, default is gzip(1).
# This shall be used by the dracut(8) tool while creating an initramfs image.
#
J
Jan Beulich 已提交
944 945 946 947 948 949
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
950 951 952
# do not export INITRD_COMPRESS, since we didn't actually
# choose a sane default compression above.
# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
L
Linus Torvalds 已提交
953

954
ifdef CONFIG_MODULE_SIG_ALL
955 956 957
$(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
958 959 960 961 962
else
mod_sign_cmd = true
endif
export mod_sign_cmd

963 964 965 966 967 968
ifdef CONFIG_STACK_VALIDATION
  has_libelf := $(call try-run,\
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
969 970
    ifdef CONFIG_UNWINDER_ORC
      $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
971 972 973
    else
      $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
    endif
974 975 976 977 978
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

979

L
Linus Torvalds 已提交
980
ifeq ($(KBUILD_EXTMOD),)
981
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
Linus Torvalds 已提交
982 983 984

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
985
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
L
Linus Torvalds 已提交
986 987

vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
988
		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
L
Linus Torvalds 已提交
989

990 991 992 993
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))
L
Linus Torvalds 已提交
994
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
995 996
libs-y2		:= $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
L
Linus Torvalds 已提交
997

998
# Externally visible symbols (used by link-vmlinux.sh)
999
export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1000 1001
export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
export KBUILD_VMLINUX_LIBS := $(libs-y1)
1002
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1003
export LDFLAGS_vmlinux
1004
# used by scripts/package/Makefile
1005
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1006

1007
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1008

1009 1010 1011
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
autoksyms_recursive: $(vmlinux-deps)
1012
ifdef CONFIG_TRIM_UNUSED_KSYMS
1013
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1014
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1015
endif
1016

1017 1018 1019 1020 1021 1022 1023
# 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

1024 1025 1026 1027 1028
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

$(autoksyms_h):
	$(Q)mkdir -p $(dir $@)
	$(Q)touch $@
1029

1030 1031 1032
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1033
cmd_link-vmlinux =                                                 \
1034
	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1035
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1036

1037 1038 1039 1040 1041 1042 1043
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
ifdef CONFIG_HEADERS_CHECK
	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
endif
ifdef CONFIG_GDB_SCRIPTS
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
endif
1044
	+$(call if_changed,link-vmlinux)
1045

1046
# Build samples along the rest of the kernel. This needs headers_install.
1047 1048
ifdef CONFIG_SAMPLES
vmlinux-dirs += samples
1049
samples: headers_install
1050 1051
endif

1052
# The actual objects are generated when descending,
L
Linus Torvalds 已提交
1053
# make sure no implicit rule kicks in
1054
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
L
Linus Torvalds 已提交
1055 1056 1057 1058 1059 1060 1061

# 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

1062
PHONY += $(vmlinux-dirs)
1063
$(vmlinux-dirs): prepare
1064
	$(Q)$(MAKE) $(build)=$@ need-builtin=1
L
Linus Torvalds 已提交
1065

1066 1067 1068 1069
define filechk_kernel.release
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
endef

G
Geert Uytterhoeven 已提交
1070
# Store (new) KERNELRELEASE string in include/config/kernel.release
1071
include/config/kernel.release: $(srctree)/Makefile FORCE
1072
	$(call filechk,kernel.release)
1073

1074 1075 1076 1077
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1078
scripts: scripts_basic scripts_dtc
1079
	$(Q)$(MAKE) $(build)=$(@)
1080

L
Linus Torvalds 已提交
1081
# Things we need to do before we recursively start building the kernel
1082 1083 1084 1085
# 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
1086

1087
# Listed in dependency order
1088
PHONY += prepare archprepare macroprepare prepare0 prepare1 prepare2 prepare3
1089

1090
# prepare3 is used to check if we are building in a separate output directory,
L
Linus Torvalds 已提交
1091 1092
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
R
Roman Zippel 已提交
1093
prepare3: include/config/kernel.release
L
Linus Torvalds 已提交
1094
ifneq ($(KBUILD_SRC),)
1095
	@$(kecho) '  Using $(srctree) as source for kernel'
R
Roman Zippel 已提交
1096
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
M
Michal Marek 已提交
1097 1098
		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
		echo >&2 "  in the '$(srctree)' directory.";\
L
Linus Torvalds 已提交
1099 1100 1101 1102
		/bin/false; \
	fi;
endif

1103 1104 1105
# prepare2 creates a makefile if using a separate output directory.
# From this point forward, .config has been reprocessed, so any rules
# that need to depend on updated CONFIG_* values can be checked here.
1106
prepare2: prepare3 outputmakefile asm-generic
L
Linus Torvalds 已提交
1107

1108
prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
S
Sam Ravnborg 已提交
1109
	$(cmd_crmodverdir)
L
Linus Torvalds 已提交
1110

1111 1112
macroprepare: prepare1 archmacros

1113
archprepare: archheaders archscripts macroprepare scripts
1114

1115
prepare0: archprepare
1116
	$(Q)$(MAKE) $(build)=scripts/mod
1117
	$(Q)$(MAKE) $(build)=.
1118

L
Linus Torvalds 已提交
1119
# All the preparing..
1120 1121
prepare: prepare0 prepare-objtool

1122 1123 1124 1125 1126 1127 1128 1129 1130
# Support for using generic headers in asm-generic
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
uapi-asm-generic:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm

1131
PHONY += prepare-objtool
1132
prepare-objtool: $(objtool_target)
L
Linus Torvalds 已提交
1133 1134 1135 1136 1137 1138 1139 1140

# 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
1141 1142 1143 1144 1145 1146 1147
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
L
Linus Torvalds 已提交
1148 1149

define filechk_version.h
J
Jesper Juhl 已提交
1150 1151
	(echo \#define LINUX_VERSION_CODE $(shell                         \
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
S
Sam Ravnborg 已提交
1152
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
L
Linus Torvalds 已提交
1153 1154
endef

1155
$(version_h): FORCE
L
Linus Torvalds 已提交
1156
	$(call filechk,version.h)
1157
	$(Q)rm -f $(old_version_h)
L
Linus Torvalds 已提交
1158

1159
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1160 1161
	$(call filechk,utsrelease.h)

1162 1163
PHONY += headerdep
headerdep:
1164 1165
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1166

1167 1168 1169
# ---------------------------------------------------------------------------
# Kernel headers

1170 1171
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1172

1173 1174
# If we do an all arch process set dst to include/arch-$(SRCARCH)
hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1175

1176 1177 1178
PHONY += archheaders
archheaders:

1179 1180 1181
PHONY += archscripts
archscripts:

1182 1183 1184
PHONY += archmacros
archmacros:

1185
PHONY += __headers
1186
__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1187
	$(Q)$(MAKE) $(build)=scripts build_unifdef
1188 1189

PHONY += headers_install_all
1190 1191
headers_install_all:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1192

1193
PHONY += headers_install
1194
headers_install: __headers
1195
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1196
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1197
	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1198
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1199

1200 1201
PHONY += headers_check_all
headers_check_all: headers_install_all
1202
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1203

1204 1205
PHONY += headers_check
headers_check: headers_install
1206
	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1207
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1208

1209 1210 1211 1212 1213
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1214
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1215

1216
PHONY += kselftest-clean
W
Wang Long 已提交
1217
kselftest-clean:
1218
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
W
Wang Long 已提交
1219

1220 1221 1222 1223 1224 1225 1226 1227
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
		-m $(objtree)/.config \
		$(srctree)/tools/testing/selftests/*/config
	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig

1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
# ---------------------------------------------------------------------------
# Devicetree files

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

ifneq ($(dtstree),)

%.dtb: prepare3 scripts_dtc
	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

PHONY += dtbs dtbs_install
dtbs: prepare3 scripts_dtc
	$(Q)$(MAKE) $(build)=$(dtstree)

dtbs_install:
	$(Q)$(MAKE) $(dtbinst)=$(dtstree)

ifdef CONFIG_OF_EARLY_FLATTREE
all: dtbs
endif

endif

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

L
Linus Torvalds 已提交
1257 1258 1259 1260 1261
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
Sam Ravnborg 已提交
1262
# By default, build modules as well
L
Linus Torvalds 已提交
1263

1264
all: modules
L
Linus Torvalds 已提交
1265

1266
# Build modules
T
Tejun Heo 已提交
1267
#
1268 1269 1270
# 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
1271

1272
PHONY += modules
1273
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
T
Tejun Heo 已提交
1274
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1275
	@$(kecho) '  Building modules, stage 2.';
S
Sam Ravnborg 已提交
1276
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
Linus Torvalds 已提交
1277

1278 1279 1280
modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin

1281
%/modules.builtin: include/config/auto.conf include/config/tristate.conf
1282 1283
	$(Q)$(MAKE) $(modbuiltin)=$*

L
Linus Torvalds 已提交
1284 1285

# Target to prepare building external modules
1286
PHONY += modules_prepare
1287
modules_prepare: prepare
L
Linus Torvalds 已提交
1288 1289

# Target to install modules
1290
PHONY += modules_install
L
Linus Torvalds 已提交
1291 1292
modules_install: _modinst_ _modinst_post

1293
PHONY += _modinst_
1294
_modinst_:
L
Linus Torvalds 已提交
1295 1296 1297
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1298
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
Linus Torvalds 已提交
1299 1300
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1301
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1302
	fi
T
Tejun Heo 已提交
1303
	@cp -f $(objtree)/modules.order $(MODLIB)/
M
Michal Marek 已提交
1304
	@cp -f $(objtree)/modules.builtin $(MODLIB)/
S
Sam Ravnborg 已提交
1305
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1306

1307
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1308 1309
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1310
PHONY += _modinst_post
1311
_modinst_post: _modinst_
1312
	$(call cmd,depmod)
L
Linus Torvalds 已提交
1313

J
Josh Boyer 已提交
1314 1315 1316 1317 1318 1319
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

L
Linus Torvalds 已提交
1320 1321 1322 1323 1324
else # CONFIG_MODULES

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

1325 1326
PHONY += modules modules_install
modules modules_install:
M
Michal Marek 已提交
1327 1328 1329 1330 1331
	@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
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343
	@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'
1344
CLEAN_DIRS  += $(MODVERDIR) include/ksym
L
Linus Torvalds 已提交
1345 1346

# Directories & files removed with 'make mrproper'
S
Sam Ravnborg 已提交
1347
MRPROPER_DIRS  += include/config usr/include include/generated          \
1348
		  arch/*/include/generated .tmp_objdiff
1349
MRPROPER_FILES += .config .config.old .version \
1350
		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1351 1352
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
J
Jan Kiszka 已提交
1353
		  signing_key.x509.signer vmlinux-gdb.py
L
Linus Torvalds 已提交
1354 1355 1356 1357 1358

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1359
clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
L
Linus Torvalds 已提交
1360

1361
PHONY += $(clean-dirs) clean archclean vmlinuxclean
L
Linus Torvalds 已提交
1362 1363 1364
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1365 1366
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1367
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1368 1369

clean: archclean vmlinuxclean
L
Linus Torvalds 已提交
1370 1371 1372 1373 1374

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1375
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
Linus Torvalds 已提交
1376

1377
PHONY += $(mrproper-dirs) mrproper archmrproper
L
Linus Torvalds 已提交
1378 1379 1380 1381 1382 1383 1384 1385 1386
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

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

# distclean
#
1387
PHONY += distclean
L
Linus Torvalds 已提交
1388 1389 1390

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1391
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1392 1393
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
Linus Torvalds 已提交
1394 1395 1396 1397 1398
		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------
1399
package-dir	:= scripts/package
L
Linus Torvalds 已提交
1400

1401 1402
%src-pkg: FORCE
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1403
%pkg: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1404
	$(Q)$(MAKE) $(build)=$(package-dir) $@
L
Linus Torvalds 已提交
1405 1406 1407 1408 1409


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

1410
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1411
boards := $(sort $(notdir $(boards)))
1412 1413
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
Linus Torvalds 已提交
1414

1415
PHONY += help
L
Linus Torvalds 已提交
1416 1417
help:
	@echo  'Cleaning targets:'
1418
	@echo  '  clean		  - Remove most generated files but keep the config and'
1419
	@echo  '                    enough build support to build external modules'
1420
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1421
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
Linus Torvalds 已提交
1422 1423 1424 1425 1426 1427 1428 1429
	@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'
1430
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1431
	@echo  '  dir/            - Build all files in dir and below'
1432
	@echo  '  dir/file.[ois]  - Build specified target only'
1433 1434
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1435 1436
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1437
	@echo  '  dir/file.ko     - Build module including final link'
1438
	@echo  '  modules_prepare - Set up for building external modules'
L
Linus Torvalds 已提交
1439 1440
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1441
	@echo  '  gtags           - Generate GNU GLOBAL index'
1442 1443 1444
	@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)'
1445
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1446
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1447
	 echo  ''
R
Randy Dunlap 已提交
1448
	@echo  'Static analysers:'
L
Linus Torvalds 已提交
1449 1450
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1451
	@echo  '  versioncheck    - Sanity check on version.h usage'
1452
	@echo  '  includecheck    - Check for duplicate included header files'
1453
	@echo  '  export_report   - List the usages of all exported symbols'
1454
	@echo  '  headers_check   - Sanity check on exported headers'
1455
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1456
	@echo  '  coccicheck      - Check with Coccinelle'
1457
	@echo  ''
R
Randy Dunlap 已提交
1458
	@echo  'Kernel selftest:'
1459 1460 1461
	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
	@echo  '                    Build, install, and boot kernel before'
	@echo  '                    running kselftest on it'
W
Wang Long 已提交
1462
	@echo  '  kselftest-clean - Remove all generated kselftest files'
1463
	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1464
	@echo  '                    .config.'
1465
	@echo  ''
1466 1467 1468 1469 1470 1471
	@$(if $(dtstree), \
		echo 'Devicetree:'; \
		echo '* dtbs            - Build device tree blobs for enabled boards'; \
		echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
		echo '')

R
Randy Dunlap 已提交
1472 1473 1474 1475
	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
Linus Torvalds 已提交
1476
	@echo  'Kernel packaging:'
S
Sam Ravnborg 已提交
1477
	@$(MAKE) $(build)=$(package-dir) help
L
Linus Torvalds 已提交
1478 1479
	@echo  ''
	@echo  'Documentation targets:'
1480
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
Linus Torvalds 已提交
1481
	@echo  ''
1482
	@echo  'Architecture specific targets ($(SRCARCH)):'
L
Linus Torvalds 已提交
1483
	@$(if $(archhelp),$(archhelp),\
1484
		echo '  No architecture specific help defined for $(SRCARCH)')
L
Linus Torvalds 已提交
1485 1486 1487 1488 1489
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1490 1491 1492 1493 1494
	@$(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
1495 1496

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1497
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
Linus Torvalds 已提交
1498
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
C
Cao jin 已提交
1499
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1500
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1501
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1502 1503 1504 1505
	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
	@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'
1506
	@echo  '		Multiple levels can be combined with W=12 or W=123'
L
Linus Torvalds 已提交
1507 1508 1509 1510 1511
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1512 1513 1514 1515
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1516
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1517 1518 1519 1520 1521 1522 1523 1524 1525

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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
1526 1527
# Documentation targets
# ---------------------------------------------------------------------------
1528 1529
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1530 1531
PHONY += $(DOC_TARGETS)
$(DOC_TARGETS): scripts_basic FORCE
1532
	$(Q)$(MAKE) $(build)=Documentation $@
L
Linus Torvalds 已提交
1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549

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
1550
#                      Install the modules built in the module directory
L
Linus Torvalds 已提交
1551 1552 1553 1554 1555
#                      Assumes install directory is already created

# We are always building modules
KBUILD_MODULES := 1

1556
PHONY += $(objtree)/Module.symvers
L
Linus Torvalds 已提交
1557 1558 1559 1560 1561 1562 1563 1564
$(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 )

module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1565
PHONY += $(module-dirs) modules
1566
$(module-dirs): prepare $(objtree)/Module.symvers
L
Linus Torvalds 已提交
1567 1568 1569
	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)

modules: $(module-dirs)
1570
	@$(kecho) '  Building modules, stage 2.';
S
Sam Ravnborg 已提交
1571
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
Linus Torvalds 已提交
1572

1573
PHONY += modules_install
1574
modules_install: _emodinst_ _emodinst_post
1575

1576 1577
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1578 1579
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
S
Sam Ravnborg 已提交
1580
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1581

1582
PHONY += _emodinst_post
1583 1584 1585
_emodinst_post: _emodinst_
	$(call cmd,depmod)

L
Linus Torvalds 已提交
1586 1587
clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))

1588
PHONY += $(clean-dirs) clean
L
Linus Torvalds 已提交
1589 1590 1591 1592
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean:	rm-dirs := $(MODVERDIR)
1593
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
L
Linus Torvalds 已提交
1594

1595
PHONY += help
L
Linus Torvalds 已提交
1596 1597 1598 1599 1600 1601 1602 1603
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  ''
1604

1605
PHONY += prepare
1606 1607
prepare:
	$(cmd_crmodverdir)
L
Linus Torvalds 已提交
1608 1609
endif # KBUILD_EXTMOD

1610 1611 1612
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
1613
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1614
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1615
		-o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1616
		-o -name '*.dwo' -o -name '*.lst' \
1617
		-o -name '*.su'  \
1618
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1619
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1620
		-o -name '*.asn1.[ch]' \
1621 1622
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
E
Emese Revfy 已提交
1623
		-o -name '*.c.[012]*.*' \
1624
		-o -name '*.ll' \
1625 1626
		-o -name '*.gcno' \) -type f -print | xargs rm -f

L
Linus Torvalds 已提交
1627 1628
# Generate tags for editors
# ---------------------------------------------------------------------------
1629 1630
quiet_cmd_tags = GEN     $@
      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
L
Linus Torvalds 已提交
1631

1632
tags TAGS cscope gtags: FORCE
L
Linus Torvalds 已提交
1633 1634 1635 1636 1637
	$(call cmd,tags)

# Scripts to check various things for consistency
# ---------------------------------------------------------------------------

P
Peter Foley 已提交
1638 1639
PHONY += includecheck versioncheck coccicheck namespacecheck export_report

L
Linus Torvalds 已提交
1640
includecheck:
1641
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
Linus Torvalds 已提交
1642
		-name '*.[hcS]' -type f -print | sort \
1643
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
L
Linus Torvalds 已提交
1644 1645

versioncheck:
1646
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
Linus Torvalds 已提交
1647
		-name '*.[hcS]' -type f -print | sort \
1648
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
L
Linus Torvalds 已提交
1649

1650 1651 1652
coccicheck:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

L
Linus Torvalds 已提交
1653 1654 1655
namespacecheck:
	$(PERL) $(srctree)/scripts/namespace.pl

1656 1657 1658
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1659
PHONY += checkstack kernelrelease kernelversion image_name
J
Jeff Dike 已提交
1660

J
Jeff Dike 已提交
1661 1662 1663 1664 1665 1666 1667 1668 1669
# 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
1670 1671
checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
J
Jeff Dike 已提交
1672
	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
L
Linus Torvalds 已提交
1673

1674 1675
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1676

1677
kernelversion:
1678
	@echo $(KERNELVERSION)
L
Linus Torvalds 已提交
1679

1680 1681 1682
image_name:
	@echo $(KBUILD_IMAGE)

1683 1684
# Clear a bunch of variables before executing the submake
tools/: FORCE
1685
	$(Q)mkdir -p $(objtree)/tools
1686
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1687 1688

tools/%: FORCE
1689
	$(Q)mkdir -p $(objtree)/tools
1690
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1691

1692 1693
# Single targets
# ---------------------------------------------------------------------------
1694
# Single targets are compatible with:
R
Robert P. J. Day 已提交
1695
# - build with mixed source and output
1696 1697 1698 1699 1700 1701 1702
# - build with separate output dir 'make O=...'
# - external modules
#
#  target-dir => where to store outputfile
#  build-dir  => directory in kernel source tree to use

ifeq ($(KBUILD_EXTMOD),)
S
Sam Ravnborg 已提交
1703
        build-dir  = $(patsubst %/,%,$(dir $@))
1704 1705 1706 1707 1708 1709 1710
        target-dir = $(dir $@)
else
        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
endif

1711
%.s: %.c prepare FORCE
1712
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1713
%.i: %.c prepare FORCE
1714
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1715
%.o: %.c prepare FORCE
1716
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1717
%.lst: %.c prepare FORCE
1718
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1719
%.s: %.S prepare FORCE
1720
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1721
%.o: %.S prepare FORCE
1722
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1723
%.symtypes: %.c prepare FORCE
1724
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1725
%.ll: %.c prepare FORCE
1726
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1727

1728
# Modules
1729
/: prepare FORCE
S
Sam Ravnborg 已提交
1730 1731
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
	$(build)=$(build-dir)
1732
# Make sure the latest headers are built for Documentation
1733
Documentation/ samples/: headers_install
1734
%/: prepare FORCE
1735
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1736
	$(build)=$(build-dir)
1737
%.ko: prepare FORCE
1738
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1739
	$(build)=$(build-dir) $(@:.ko=.o)
S
Sam Ravnborg 已提交
1740
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1741

1742
# FIXME Should go into a make.lib or something
L
Linus Torvalds 已提交
1743 1744 1745 1746 1747 1748 1749 1750
# ===========================================================================

quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
      cmd_rmdirs = rm -rf $(rm-dirs)

quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
      cmd_rmfiles = rm -f $(rm-files)

1751
# Run depmod only if we have System.map and depmod is executable
1752
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
M
Michal Marek 已提交
1753
      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1754
                   $(KERNELRELEASE)
1755

S
Sam Ravnborg 已提交
1756
# Create temporary dir for module support files
1757 1758 1759
# clean it up only when building all modules
cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
L
Linus Torvalds 已提交
1760 1761

# read all saved command lines
1762
cmd_files := $(wildcard .*.cmd)
L
Linus Torvalds 已提交
1763 1764 1765 1766 1767 1768

ifneq ($(cmd_files),)
  $(cmd_files): ;	# Do not try to update included dependency files
  include $(cmd_files)
endif

1769 1770
endif   # ifeq ($(config-targets),1)
endif   # ifeq ($(mixed-targets),1)
L
Linus Torvalds 已提交
1771 1772
endif	# skip-makefile

1773
PHONY += FORCE
L
Linus Torvalds 已提交
1774
FORCE:
1775

1776
# Declare the contents of the PHONY variable as phony.  We keep that
1777
# information in a variable so we can use it in if_changed and friends.
1778
.PHONY: $(PHONY)