Makefile 58.3 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 = 18
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 = Merciless Moray
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 21
# o Do not use make's built-in rules and variables
#   (this increases performance and avoids hard-to-debug behaviour);
# o Look for make include files relative to root of kernel src
MAKEFLAGS += -rR --include-dir=$(CURDIR)
L
Linus Torvalds 已提交
22

23
# Avoid funny character set dependencies
24
unexport LC_ALL
25 26
LC_COLLATE=C
LC_NUMERIC=C
27
export LC_COLLATE LC_NUMERIC
28

29 30 31
# Avoid interference with shell env settings
unexport GREP_OPTIONS

L
Linus Torvalds 已提交
32 33 34 35 36 37
# 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
38
# unavoidable when linking the built-in.a targets which finally
L
Linus Torvalds 已提交
39 40 41 42 43 44 45 46 47
# 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.

48 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.
#
L
Linus Torvalds 已提交
71 72 73
# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands

74 75
ifeq ("$(origin V)", "command line")
  KBUILD_VERBOSE = $(V)
L
Linus Torvalds 已提交
76 77 78 79 80
endif
ifndef KBUILD_VERBOSE
  KBUILD_VERBOSE = 0
endif

81 82 83 84 85 86 87 88 89 90 91
ifeq ($(KBUILD_VERBOSE),1)
  quiet =
  Q =
else
  quiet=quiet_
  Q = @
endif

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

92
ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
93
  quiet=silent_
94
  tools_silent=s
95 96 97 98
endif

export quiet Q KBUILD_VERBOSE

L
Linus Torvalds 已提交
99 100 101 102 103
# 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
104
#
L
Linus Torvalds 已提交
105 106 107 108 109 110 111 112 113
# 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
114 115
# 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
116 117 118 119
ifeq ($(KBUILD_SRC),)

# OK, Make called in directory where kernel src resides
# Do we want to locate output files in a separate directory?
120 121
ifeq ("$(origin O)", "command line")
  KBUILD_OUTPUT := $(O)
L
Linus Torvalds 已提交
122 123
endif

124 125 126
# Cancel implicit rules on top Makefile
$(CURDIR)/Makefile Makefile: ;

127 128 129 130
ifneq ($(words $(subst :, ,$(CURDIR))), 1)
  $(error main directory cannot contain spaces nor colons)
endif

L
Linus Torvalds 已提交
131 132 133
ifneq ($(KBUILD_OUTPUT),)
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
134
KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
B
Bjørn Forsman 已提交
135
								&& pwd)
L
Linus Torvalds 已提交
136
$(if $(KBUILD_OUTPUT),, \
137
     $(error failed to create output directory "$(saved-output)"))
L
Linus Torvalds 已提交
138

139 140
PHONY += $(MAKECMDGOALS) sub-make

141
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
142
	@:
143

C
Cao jin 已提交
144
# Invoke a second make in the output directory, passing relevant variables
145
sub-make:
146
	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
147
	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
L
Linus Torvalds 已提交
148 149 150 151 152 153 154 155 156

# 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),)

157 158 159 160 161
# 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

162 163 164 165 166 167 168
# 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
169 170
# See the file "Documentation/dev-tools/sparse.rst" for more details,
# including where to get the "sparse" utility.
171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189

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
  KBUILD_EXTMOD ?= $(SUBDIRS)
endif

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

190 191 192 193 194 195 196 197 198 199 200
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
201 202 203

export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC

204
objtree		:= .
L
Linus Torvalds 已提交
205 206 207
src		:= $(srctree)
obj		:= $(objtree)

208
VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
L
Linus Torvalds 已提交
209

210
export srctree objtree VPATH
L
Linus Torvalds 已提交
211

212 213 214 215 216 217 218 219 220 221 222
# 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

223 224
clean-targets := %clean mrproper cleandocs
no-dot-config-targets := $(clean-targets) \
225 226
			 cscope gtags TAGS tags help% %docs check% coccicheck \
			 $(version_h) headers_% archheaders archscripts \
227
			 %asm-generic kernelversion %src-pkg
228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246

config-targets := 0
mixed-targets  := 0
dot-config     := 1

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

ifeq ($(KBUILD_EXTMOD),)
        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
                config-targets := 1
                ifneq ($(words $(MAKECMDGOALS)),1)
                        mixed-targets := 1
                endif
        endif
endif
247 248 249 250 251 252 253 254

# 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

255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288
# 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

L
Linus Torvalds 已提交
289 290 291
# SUBARCH tells the usermode build what the underlying arch is.  That is set
# first, and if a usermode build is happening, the "ARCH=um" on the command
# line overrides the setting of ARCH below.  If a native build is happening,
292
# then ARCH is assigned, getting whatever value it gets normally, and
L
Linus Torvalds 已提交
293 294
# SUBARCH is subsequently ignored.

295 296
SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
				  -e s/sun4u/sparc64/ \
L
Linus Torvalds 已提交
297
				  -e s/arm.*/arm/ -e s/sa110/arm/ \
298
				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
P
Paul Mundt 已提交
299
				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
P
Palmer Dabbelt 已提交
300 301
				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
				  -e s/riscv.*/riscv/)
L
Linus Torvalds 已提交
302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320

# 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
321
ARCH		?= $(SUBARCH)
L
Linus Torvalds 已提交
322 323

# Architecture as present in compile.h
324 325
UTS_MACHINE 	:= $(ARCH)
SRCARCH 	:= $(ARCH)
L
Linus Torvalds 已提交
326

327 328 329 330 331 332 333
# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
        SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
        SRCARCH := x86
endif
334

S
Sam Ravnborg 已提交
335
# Additional ARCH settings for sparc
N
Namhyung Kim 已提交
336 337 338
ifeq ($(ARCH),sparc32)
       SRCARCH := sparc
endif
339
ifeq ($(ARCH),sparc64)
S
Sam Ravnborg 已提交
340
       SRCARCH := sparc
341
endif
342

343 344 345 346 347
# Additional ARCH settings for sh
ifeq ($(ARCH),sh64)
       SRCARCH := sh
endif

R
Roman Zippel 已提交
348
KCONFIG_CONFIG	?= .config
349
export KCONFIG_CONFIG
R
Roman Zippel 已提交
350

L
Linus Torvalds 已提交
351 352 353 354 355
# 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)

356 357 358
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)
359

S
Sam Ravnborg 已提交
360 361
HOSTCC       = gcc
HOSTCXX      = g++
362
KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
363 364 365 366 367
		-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
368 369 370 371 372 373 374 375 376 377 378

# 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
379 380
LEX		= flex
YACC		= bison
L
Linus Torvalds 已提交
381 382
AWK		= awk
GENKSYMS	= scripts/genksyms/genksyms
383
INSTALLKERNEL  := installkernel
L
Linus Torvalds 已提交
384 385
DEPMOD		= /sbin/depmod
PERL		= perl
386
PYTHON		= python
387 388
PYTHON2		= python2
PYTHON3		= python3
L
Linus Torvalds 已提交
389 390
CHECK		= sparse

391
CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
392
		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
393
NOSTDINC_FLAGS  =
394 395 396
CFLAGS_MODULE   =
AFLAGS_MODULE   =
LDFLAGS_MODULE  =
L
Linus Torvalds 已提交
397 398
CFLAGS_KERNEL	=
AFLAGS_KERNEL	=
399
LDFLAGS_vmlinux =
L
Linus Torvalds 已提交
400

401 402
# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE    := \
403 404
		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
405
		-I$(srctree)/include/uapi \
406
		-I$(objtree)/include/generated/uapi \
407 408
                -include $(srctree)/include/linux/kconfig.h

L
Linus Torvalds 已提交
409 410
# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
411
LINUXINCLUDE    := \
412 413
		-I$(srctree)/arch/$(SRCARCH)/include \
		-I$(objtree)/arch/$(SRCARCH)/include/generated \
414
		$(if $(KBUILD_SRC), -I$(srctree)/include) \
415 416
		-I$(objtree)/include \
		$(USERINCLUDE)
L
Linus Torvalds 已提交
417

418
KBUILD_AFLAGS   := -D__ASSEMBLY__
419
KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
420
		   -fno-strict-aliasing -fno-common -fshort-wchar \
421
		   -Werror-implicit-function-declaration \
422
		   -Wno-format-security \
423 424
		   -std=gnu89
KBUILD_CPPFLAGS := -D__KERNEL__
425 426
KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
427 428 429
KBUILD_AFLAGS_MODULE  := -DMODULE
KBUILD_CFLAGS_MODULE  := -DMODULE
KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
430
LDFLAGS :=
431
GCC_PLUGINS_CFLAGS :=
L
Linus Torvalds 已提交
432

433
export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
434
export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
435
export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
436
export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
L
Linus Torvalds 已提交
437

438
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
439 440
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
441
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
442
export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
443
export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
444
export KBUILD_ARFLAGS
L
Linus Torvalds 已提交
445 446 447 448 449 450 451 452

# 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

453 454 455
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
456 457
export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
L
Linus Torvalds 已提交
458 459 460 461

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

462
# Basic helpers built in scripts/basic/
463
PHONY += scripts_basic
L
Linus Torvalds 已提交
464 465
scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic
466
	$(Q)rm -f .tmp_quiet_recordmcount
L
Linus Torvalds 已提交
467

468 469 470
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

471
PHONY += outputmakefile
472 473 474
# 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
475
outputmakefile:
476
ifneq ($(KBUILD_SRC),)
477
	$(Q)ln -fsn $(srctree) source
478 479 480
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif
L
Linus Torvalds 已提交
481

482 483 484 485 486 487 488 489 490 491
ifeq ($(cc-name),clang)
ifneq ($(CROSS_COMPILE),)
CLANG_TARGET	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
GCC_TOOLCHAIN	:= $(realpath $(dir $(shell which $(LD)))/..)
endif
ifneq ($(GCC_TOOLCHAIN),)
CLANG_GCC_TC	:= --gcc-toolchain=$(GCC_TOOLCHAIN)
endif
KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
492 493
KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
494 495
endif

496 497 498 499 500
RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
export RETPOLINE_CFLAGS

501 502 503
KBUILD_CFLAGS	+= $(call cc-option,-fno-PIE)
KBUILD_AFLAGS	+= $(call cc-option,-fno-PIE)

P
Peter Zijlstra 已提交
504
# check for 'asm goto'
M
Masahiro Yamada 已提交
505
ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
P
Peter Zijlstra 已提交
506 507 508 509 510
  CC_HAVE_ASM_GOTO := 1
  KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
  KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
endif

511 512 513 514 515 516
# 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
517 518 519 520 521 522 523 524
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'
525
include arch/$(SRCARCH)/Makefile
526
export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
L
Linus Torvalds 已提交
527

S
Sam Ravnborg 已提交
528 529 530 531
config: scripts_basic outputmakefile FORCE
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

%config: scripts_basic outputmakefile FORCE
L
Linus Torvalds 已提交
532 533 534 535 536 537 538
	$(Q)$(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.

539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576
# 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
577 578 579
ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
580
drivers-y	:= drivers/ sound/ firmware/
L
Linus Torvalds 已提交
581 582 583
net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
584
virt-y		:= virt/
L
Linus Torvalds 已提交
585 586 587
endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
588
-include include/config/auto.conf
589 590 591 592 593 594 595 596 597 598 599
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,)
600
export CFLAGS_GCOV
601 602 603 604 605 606 607

# 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
608

609
ifeq ($(dot-config),1)
610
ifeq ($(KBUILD_EXTMOD),)
611 612 613
# 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
614
-include include/config/auto.conf.cmd
L
Linus Torvalds 已提交
615 616

# To avoid any implicit rule to kick in, define an empty command
R
Roman Zippel 已提交
617
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
L
Linus Torvalds 已提交
618

619 620 621
# 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
622
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
623
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
624
else
625
# external modules needs include/generated/autoconf.h and include/config/auto.conf
626 627 628 629
# but do not care if they are up-to-date. Use auto.conf to trigger the test
PHONY += include/config/auto.conf

include/config/auto.conf:
630
	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
M
Michal Marek 已提交
631 632 633 634 635
	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 ;							\
636 637 638
	/bin/false)

endif # KBUILD_EXTMOD
R
Roman Zippel 已提交
639

L
Linus Torvalds 已提交
640 641
else
# Dummy target needed, because used as prerequisite
R
Roman Zippel 已提交
642
include/config/auto.conf: ;
643
endif # $(dot-config)
L
Linus Torvalds 已提交
644

645
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
646
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
647 648 649
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)
650

L
Linus Torvalds 已提交
651
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
652 653
KBUILD_CFLAGS	+= $(call cc-option,-Oz,-Os)
KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
L
Linus Torvalds 已提交
654
else
655
ifdef CONFIG_PROFILE_ALL_BRANCHES
656
KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)
657 658 659
else
KBUILD_CFLAGS   += -O2
endif
L
Linus Torvalds 已提交
660 661
endif

662 663 664
KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
			$(call cc-disable-warning,maybe-uninitialized,))

665 666 667
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

668
include scripts/Makefile.kcov
E
Emese Revfy 已提交
669 670
include scripts/Makefile.gcc-plugins

A
Andi Kleen 已提交
671 672 673 674 675 676 677 678 679 680
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

681
ifneq ($(CONFIG_FRAME_WARN),0)
682 683 684
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

685
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
686 687
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
688 689

KBUILD_CFLAGS += $(stackp-flags-y)
690

691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709
ifeq ($(cc-name),clang)
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)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
endif

710
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
L
Linus Torvalds 已提交
711
ifdef CONFIG_FRAME_POINTER
712
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
L
Linus Torvalds 已提交
713
else
714 715 716 717 718 719
# 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
720
KBUILD_CFLAGS	+= -fomit-frame-pointer
L
Linus Torvalds 已提交
721
endif
722
endif
L
Linus Torvalds 已提交
723

724 725
KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)

L
Linus Torvalds 已提交
726
ifdef CONFIG_DEBUG_INFO
A
Andi Kleen 已提交
727 728 729
ifdef CONFIG_DEBUG_INFO_SPLIT
KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
else
730
KBUILD_CFLAGS	+= -g
A
Andi Kleen 已提交
731
endif
732
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
L
Linus Torvalds 已提交
733
endif
734 735 736
ifdef CONFIG_DEBUG_INFO_DWARF4
KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
endif
L
Linus Torvalds 已提交
737

738
ifdef CONFIG_DEBUG_INFO_REDUCED
739 740
KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
		   $(call cc-option,-fno-var-tracking)
741 742
endif

743
ifdef CONFIG_FUNCTION_TRACER
744 745 746 747
ifndef CC_FLAGS_FTRACE
CC_FLAGS_FTRACE := -pg
endif
export CC_FLAGS_FTRACE
748 749 750
ifdef CONFIG_HAVE_FENTRY
CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
endif
751
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
752
KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
753
ifdef CONFIG_DYNAMIC_FTRACE
754
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
755 756 757 758
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
759 760
endif

761 762 763 764 765
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

766
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
767 768
KBUILD_CFLAGS_KERNEL	+= $(call cc-option,-ffunction-sections,)
KBUILD_CFLAGS_KERNEL	+= $(call cc-option,-fdata-sections,)
769 770
endif

771
# arch Makefile may override CC so keep this after arch Makefile is included
M
Masahiro Yamada 已提交
772
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
773

L
Linus Torvalds 已提交
774
# warn about C99 declaration after statement
775
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
L
Linus Torvalds 已提交
776

S
Sam Ravnborg 已提交
777
# disable pointer signed / unsigned warnings in gcc 4.0
778
KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
L
Linus Torvalds 已提交
779

780
# disable invalid "can't wrap" optimizations for signed / pointers
781
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
782

783 784 785 786 787 788 789 790 791
# 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)

792 793 794
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

795 796 797
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

798 799 800 801 802 803
# 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)

804 805 806
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

807 808 809
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

810 811 812
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

813 814 815
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

816 817 818
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

819 820
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
821
include scripts/Makefile.ubsan
822

823 824 825 826 827
# 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)
828

R
Roland McGrath 已提交
829
# Use --build-id when available.
830
LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
831
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
R
Roland McGrath 已提交
832 833
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

834 835 836 837
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
LDFLAGS_vmlinux	+= $(call ld-option, --gc-sections,)
endif

838
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
839
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
840 841
endif

842 843 844
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

845 846 847
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

L
Linus Torvalds 已提交
848
# Default kernel image to build when no specific target is given.
S
Sam Ravnborg 已提交
849
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
850 851 852 853 854 855 856 857 858 859
# 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

860 861 862 863 864 865 866
#
# 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
867 868 869
#
# 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
870
# makefile but the argument can be passed to make if needed.
L
Linus Torvalds 已提交
871 872
#

873
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
Linus Torvalds 已提交
874 875
export MODLIB

876
#
877 878 879 880
# 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.
881

882 883
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
884
mod_strip_cmd = $(STRIP) --strip-debug
885
else
886
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
887 888
endif # INSTALL_MOD_STRIP=1
else
889
mod_strip_cmd = true
890 891 892
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

893 894 895 896 897 898 899
# 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
900
    mod_compress_cmd = gzip -n -f
901 902
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
903
    mod_compress_cmd = xz -f
904 905 906 907
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

908 909 910
# 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
911 912 913 914 915 916
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
917 918 919
# 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
920

921
ifdef CONFIG_MODULE_SIG_ALL
922 923 924
$(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
925 926 927 928 929
else
mod_sign_cmd = true
endif
export mod_sign_cmd

930 931 932 933 934 935
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
936 937
    ifdef CONFIG_UNWINDER_ORC
      $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
938 939 940
    else
      $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
    endif
941 942 943 944 945
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

946

L
Linus Torvalds 已提交
947
ifeq ($(KBUILD_EXTMOD),)
948
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
Linus Torvalds 已提交
949 950 951

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
952
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
L
Linus Torvalds 已提交
953 954

vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
955
		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
L
Linus Torvalds 已提交
956

957 958 959 960
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
961
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
962 963
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
964

965
# Externally visible symbols (used by link-vmlinux.sh)
966
export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
967 968
export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
export KBUILD_VMLINUX_LIBS := $(libs-y1)
969
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
970
export LDFLAGS_vmlinux
971
# used by scripts/package/Makefile
972
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
973

974
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
975

976 977 978
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
autoksyms_recursive: $(vmlinux-deps)
979
ifdef CONFIG_TRIM_UNUSED_KSYMS
980
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
981
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
982
endif
983

984 985 986 987 988 989 990
# 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

991 992 993 994 995
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

$(autoksyms_h):
	$(Q)mkdir -p $(dir $@)
	$(Q)touch $@
996

997 998 999
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1000 1001
cmd_link-vmlinux =                                                 \
	$(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1002
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1003

1004 1005 1006 1007 1008 1009 1010
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 $(srctree)/scripts/gdb/vmlinux-gdb.py)
endif
1011
	+$(call if_changed,link-vmlinux)
1012

1013 1014 1015 1016 1017
# Build samples along the rest of the kernel
ifdef CONFIG_SAMPLES
vmlinux-dirs += samples
endif

1018
# The actual objects are generated when descending,
L
Linus Torvalds 已提交
1019
# make sure no implicit rule kicks in
1020
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
L
Linus Torvalds 已提交
1021 1022 1023 1024 1025 1026 1027

# 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

1028
PHONY += $(vmlinux-dirs)
1029
$(vmlinux-dirs): prepare scripts
1030
	$(Q)$(MAKE) $(build)=$@ need-builtin=1
L
Linus Torvalds 已提交
1031

1032 1033 1034 1035
define filechk_kernel.release
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
endef

G
Geert Uytterhoeven 已提交
1036
# Store (new) KERNELRELEASE string in include/config/kernel.release
R
Roman Zippel 已提交
1037
include/config/kernel.release: include/config/auto.conf FORCE
1038
	$(call filechk,kernel.release)
1039

1040 1041 1042 1043 1044
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
1045
	 asm-generic gcc-plugins $(autoksyms_h)
1046
	$(Q)$(MAKE) $(build)=$(@)
1047

L
Linus Torvalds 已提交
1048
# Things we need to do before we recursively start building the kernel
1049 1050 1051 1052
# 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
1053

1054
# Listed in dependency order
1055
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1056

1057
# prepare3 is used to check if we are building in a separate output directory,
L
Linus Torvalds 已提交
1058 1059
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
R
Roman Zippel 已提交
1060
prepare3: include/config/kernel.release
L
Linus Torvalds 已提交
1061
ifneq ($(KBUILD_SRC),)
1062
	@$(kecho) '  Using $(srctree) as source for kernel'
R
Roman Zippel 已提交
1063
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
M
Michal Marek 已提交
1064 1065
		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
		echo >&2 "  in the '$(srctree)' directory.";\
L
Linus Torvalds 已提交
1066 1067 1068 1069
		/bin/false; \
	fi;
endif

1070 1071 1072
# 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.
1073
prepare2: prepare3 outputmakefile asm-generic
L
Linus Torvalds 已提交
1074

1075
prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
S
Sam Ravnborg 已提交
1076
                   include/config/auto.conf
S
Sam Ravnborg 已提交
1077
	$(cmd_crmodverdir)
L
Linus Torvalds 已提交
1078

1079
archprepare: archheaders archscripts prepare1 scripts_basic
1080

E
Emese Revfy 已提交
1081
prepare0: archprepare gcc-plugins
1082
	$(Q)$(MAKE) $(build)=.
1083

L
Linus Torvalds 已提交
1084
# All the preparing..
1085 1086
prepare: prepare0 prepare-objtool

1087 1088 1089 1090 1091 1092 1093 1094 1095
# 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

1096
PHONY += prepare-objtool
1097
prepare-objtool: $(objtool_target)
L
Linus Torvalds 已提交
1098 1099 1100 1101 1102 1103 1104 1105

# 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
1106 1107 1108 1109 1110 1111 1112
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
1113 1114

define filechk_version.h
J
Jesper Juhl 已提交
1115 1116
	(echo \#define LINUX_VERSION_CODE $(shell                         \
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
S
Sam Ravnborg 已提交
1117
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
L
Linus Torvalds 已提交
1118 1119
endef

1120
$(version_h): FORCE
L
Linus Torvalds 已提交
1121
	$(call filechk,version.h)
1122
	$(Q)rm -f $(old_version_h)
L
Linus Torvalds 已提交
1123

1124
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1125 1126
	$(call filechk,utsrelease.h)

1127 1128
PHONY += headerdep
headerdep:
1129 1130
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1131

1132 1133 1134
# ---------------------------------------------------------------------------
# Kernel headers

1135 1136
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1137

1138 1139
# If we do an all arch process set dst to include/arch-$(SRCARCH)
hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1140

1141 1142 1143
PHONY += archheaders
archheaders:

1144 1145 1146
PHONY += archscripts
archscripts:

1147
PHONY += __headers
1148
__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1149
	$(Q)$(MAKE) $(build)=scripts build_unifdef
1150 1151

PHONY += headers_install_all
1152 1153
headers_install_all:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1154

1155
PHONY += headers_install
1156
headers_install: __headers
1157
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1158
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1159
	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1160
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1161

1162 1163
PHONY += headers_check_all
headers_check_all: headers_install_all
1164
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1165

1166 1167
PHONY += headers_check
headers_check: headers_install
1168
	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1169
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1170

1171 1172 1173 1174 1175
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1176
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1177

1178
PHONY += kselftest-clean
W
Wang Long 已提交
1179
kselftest-clean:
1180
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
W
Wang Long 已提交
1181

1182 1183 1184 1185 1186 1187 1188 1189
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

L
Linus Torvalds 已提交
1190 1191 1192 1193 1194
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
Sam Ravnborg 已提交
1195
# By default, build modules as well
L
Linus Torvalds 已提交
1196

1197
all: modules
L
Linus Torvalds 已提交
1198

1199
# Build modules
T
Tejun Heo 已提交
1200
#
1201 1202 1203
# 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
1204

1205
PHONY += modules
1206
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
T
Tejun Heo 已提交
1207
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1208
	@$(kecho) '  Building modules, stage 2.';
S
Sam Ravnborg 已提交
1209
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
Linus Torvalds 已提交
1210

1211 1212 1213
modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin

1214
%/modules.builtin: include/config/auto.conf
1215 1216
	$(Q)$(MAKE) $(modbuiltin)=$*

L
Linus Torvalds 已提交
1217 1218

# Target to prepare building external modules
1219
PHONY += modules_prepare
1220
modules_prepare: prepare scripts
L
Linus Torvalds 已提交
1221 1222

# Target to install modules
1223
PHONY += modules_install
L
Linus Torvalds 已提交
1224 1225
modules_install: _modinst_ _modinst_post

1226
PHONY += _modinst_
1227
_modinst_:
L
Linus Torvalds 已提交
1228 1229 1230
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1231
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
Linus Torvalds 已提交
1232 1233
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1234
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1235
	fi
T
Tejun Heo 已提交
1236
	@cp -f $(objtree)/modules.order $(MODLIB)/
M
Michal Marek 已提交
1237
	@cp -f $(objtree)/modules.builtin $(MODLIB)/
S
Sam Ravnborg 已提交
1238
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1239

1240
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1241 1242
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1243
PHONY += _modinst_post
1244
_modinst_post: _modinst_
1245
	$(call cmd,depmod)
L
Linus Torvalds 已提交
1246

J
Josh Boyer 已提交
1247 1248 1249 1250 1251 1252
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

L
Linus Torvalds 已提交
1253 1254 1255 1256 1257
else # CONFIG_MODULES

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

1258 1259
PHONY += modules modules_install
modules modules_install:
M
Michal Marek 已提交
1260 1261 1262 1263 1264
	@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
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276
	@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'
1277
CLEAN_DIRS  += $(MODVERDIR) include/ksym
L
Linus Torvalds 已提交
1278 1279

# Directories & files removed with 'make mrproper'
S
Sam Ravnborg 已提交
1280
MRPROPER_DIRS  += include/config usr/include include/generated          \
1281
		  arch/*/include/generated .tmp_objdiff
1282
MRPROPER_FILES += .config .config.old .version \
1283
		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1284 1285
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
J
Jan Kiszka 已提交
1286
		  signing_key.x509.signer vmlinux-gdb.py
L
Linus Torvalds 已提交
1287 1288 1289 1290 1291

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1292
clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
L
Linus Torvalds 已提交
1293

1294
PHONY += $(clean-dirs) clean archclean vmlinuxclean
L
Linus Torvalds 已提交
1295 1296 1297
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1298 1299
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1300
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1301 1302

clean: archclean vmlinuxclean
L
Linus Torvalds 已提交
1303 1304 1305 1306 1307

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1308
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
Linus Torvalds 已提交
1309

1310
PHONY += $(mrproper-dirs) mrproper archmrproper
L
Linus Torvalds 已提交
1311 1312 1313 1314 1315 1316 1317 1318 1319
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

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

# distclean
#
1320
PHONY += distclean
L
Linus Torvalds 已提交
1321 1322 1323

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1324
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1325 1326
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
Linus Torvalds 已提交
1327 1328 1329 1330 1331 1332
		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------
# rpm target kept for backward compatibility
1333
package-dir	:= scripts/package
L
Linus Torvalds 已提交
1334

1335 1336
%src-pkg: FORCE
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1337
%pkg: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1338
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1339 1340 1341
rpm: rpm-pkg
	@echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
	@echo "           Please use \"rpm-pkg\" instead."
L
Linus Torvalds 已提交
1342 1343 1344 1345 1346


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

1347
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1348
boards := $(sort $(notdir $(boards)))
1349 1350
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
Linus Torvalds 已提交
1351

1352
PHONY += help
L
Linus Torvalds 已提交
1353 1354
help:
	@echo  'Cleaning targets:'
1355
	@echo  '  clean		  - Remove most generated files but keep the config and'
1356
	@echo  '                    enough build support to build external modules'
1357
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1358
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
Linus Torvalds 已提交
1359 1360 1361 1362 1363 1364 1365 1366
	@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'
1367
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1368
	@echo  '  dir/            - Build all files in dir and below'
1369
	@echo  '  dir/file.[ois]  - Build specified target only'
1370 1371
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1372 1373
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1374
	@echo  '  dir/file.ko     - Build module including final link'
1375
	@echo  '  modules_prepare - Set up for building external modules'
L
Linus Torvalds 已提交
1376 1377
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1378
	@echo  '  gtags           - Generate GNU GLOBAL index'
1379 1380 1381
	@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)'
1382
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1383
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1384
	 echo  ''
R
Randy Dunlap 已提交
1385
	@echo  'Static analysers:'
L
Linus Torvalds 已提交
1386 1387
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1388
	@echo  '  versioncheck    - Sanity check on version.h usage'
1389
	@echo  '  includecheck    - Check for duplicate included header files'
1390
	@echo  '  export_report   - List the usages of all exported symbols'
1391
	@echo  '  headers_check   - Sanity check on exported headers'
1392
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1393
	@echo  '  coccicheck      - Check with Coccinelle'
1394
	@echo  ''
R
Randy Dunlap 已提交
1395
	@echo  'Kernel selftest:'
1396 1397 1398
	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
	@echo  '                    Build, install, and boot kernel before'
	@echo  '                    running kselftest on it'
W
Wang Long 已提交
1399
	@echo  '  kselftest-clean - Remove all generated kselftest files'
1400
	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1401
	@echo  '                    .config.'
1402
	@echo  ''
R
Randy Dunlap 已提交
1403 1404 1405 1406
	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
Linus Torvalds 已提交
1407
	@echo  'Kernel packaging:'
S
Sam Ravnborg 已提交
1408
	@$(MAKE) $(build)=$(package-dir) help
L
Linus Torvalds 已提交
1409 1410
	@echo  ''
	@echo  'Documentation targets:'
1411
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
Linus Torvalds 已提交
1412
	@echo  ''
1413
	@echo  'Architecture specific targets ($(SRCARCH)):'
L
Linus Torvalds 已提交
1414
	@$(if $(archhelp),$(archhelp),\
1415
		echo '  No architecture specific help defined for $(SRCARCH)')
L
Linus Torvalds 已提交
1416 1417 1418 1419 1420
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1421 1422 1423 1424 1425
	@$(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
1426 1427

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1428
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
Linus Torvalds 已提交
1429
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
C
Cao jin 已提交
1430
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1431
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1432
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1433 1434 1435 1436
	@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'
1437
	@echo  '		Multiple levels can be combined with W=12 or W=123'
L
Linus Torvalds 已提交
1438 1439 1440 1441 1442
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1443 1444 1445 1446
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1447
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1448 1449 1450 1451 1452 1453 1454 1455 1456

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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
1457 1458
# Documentation targets
# ---------------------------------------------------------------------------
1459 1460
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1461 1462
PHONY += $(DOC_TARGETS)
$(DOC_TARGETS): scripts_basic FORCE
1463
	$(Q)$(MAKE) $(build)=Documentation $@
L
Linus Torvalds 已提交
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480

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
1481
#                      Install the modules built in the module directory
L
Linus Torvalds 已提交
1482 1483 1484 1485
#                      Assumes install directory is already created

# We are always building modules
KBUILD_MODULES := 1
1486
PHONY += crmodverdir
L
Linus Torvalds 已提交
1487
crmodverdir:
S
Sam Ravnborg 已提交
1488
	$(cmd_crmodverdir)
L
Linus Torvalds 已提交
1489

1490
PHONY += $(objtree)/Module.symvers
L
Linus Torvalds 已提交
1491 1492 1493 1494 1495 1496 1497 1498
$(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))
1499
PHONY += $(module-dirs) modules
L
Linus Torvalds 已提交
1500 1501 1502 1503
$(module-dirs): crmodverdir $(objtree)/Module.symvers
	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)

modules: $(module-dirs)
1504
	@$(kecho) '  Building modules, stage 2.';
S
Sam Ravnborg 已提交
1505
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
Linus Torvalds 已提交
1506

1507
PHONY += modules_install
1508
modules_install: _emodinst_ _emodinst_post
1509

1510 1511
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1512 1513
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
S
Sam Ravnborg 已提交
1514
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1515

1516
PHONY += _emodinst_post
1517 1518 1519
_emodinst_post: _emodinst_
	$(call cmd,depmod)

L
Linus Torvalds 已提交
1520 1521
clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))

1522
PHONY += $(clean-dirs) clean
L
Linus Torvalds 已提交
1523 1524 1525 1526
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean:	rm-dirs := $(MODVERDIR)
1527
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
L
Linus Torvalds 已提交
1528

1529
PHONY += help
L
Linus Torvalds 已提交
1530 1531 1532 1533 1534 1535 1536 1537
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  ''
1538 1539

# Dummies...
1540
PHONY += prepare scripts
1541 1542
prepare: ;
scripts: ;
L
Linus Torvalds 已提交
1543 1544
endif # KBUILD_EXTMOD

1545 1546 1547
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
1548
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1549
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1550
		-o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1551
		-o -name '*.dwo' -o -name '*.lst' \
1552
		-o -name '*.su'  \
1553
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1554
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1555
		-o -name '*.asn1.[ch]' \
1556 1557
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
E
Emese Revfy 已提交
1558
		-o -name '*.c.[012]*.*' \
1559
		-o -name '*.ll' \
1560 1561
		-o -name '*.gcno' \) -type f -print | xargs rm -f

L
Linus Torvalds 已提交
1562 1563
# Generate tags for editors
# ---------------------------------------------------------------------------
1564 1565
quiet_cmd_tags = GEN     $@
      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
L
Linus Torvalds 已提交
1566

1567
tags TAGS cscope gtags: FORCE
L
Linus Torvalds 已提交
1568 1569 1570 1571 1572
	$(call cmd,tags)

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

P
Peter Foley 已提交
1573 1574
PHONY += includecheck versioncheck coccicheck namespacecheck export_report

L
Linus Torvalds 已提交
1575
includecheck:
1576
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
Linus Torvalds 已提交
1577
		-name '*.[hcS]' -type f -print | sort \
1578
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
L
Linus Torvalds 已提交
1579 1580

versioncheck:
1581
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
Linus Torvalds 已提交
1582
		-name '*.[hcS]' -type f -print | sort \
1583
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
L
Linus Torvalds 已提交
1584

1585 1586 1587
coccicheck:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

L
Linus Torvalds 已提交
1588 1589 1590
namespacecheck:
	$(PERL) $(srctree)/scripts/namespace.pl

1591 1592 1593
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

L
Linus Torvalds 已提交
1594 1595 1596
endif #ifeq ($(config-targets),1)
endif #ifeq ($(mixed-targets),1)

1597
PHONY += checkstack kernelrelease kernelversion image_name
J
Jeff Dike 已提交
1598

J
Jeff Dike 已提交
1599 1600 1601 1602 1603 1604 1605 1606 1607
# 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
1608 1609
checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
J
Jeff Dike 已提交
1610
	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
L
Linus Torvalds 已提交
1611

1612 1613
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1614

1615
kernelversion:
1616
	@echo $(KERNELVERSION)
L
Linus Torvalds 已提交
1617

1618 1619 1620
image_name:
	@echo $(KBUILD_IMAGE)

1621 1622
# Clear a bunch of variables before executing the submake
tools/: FORCE
1623
	$(Q)mkdir -p $(objtree)/tools
1624
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1625 1626

tools/%: FORCE
1627
	$(Q)mkdir -p $(objtree)/tools
1628
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1629

1630 1631
# Single targets
# ---------------------------------------------------------------------------
1632
# Single targets are compatible with:
R
Robert P. J. Day 已提交
1633
# - build with mixed source and output
1634 1635 1636 1637 1638 1639 1640
# - 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
1641
        build-dir  = $(patsubst %/,%,$(dir $@))
1642 1643 1644 1645 1646 1647 1648
        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

1649
%.s: %.c prepare scripts FORCE
1650
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1651
%.i: %.c prepare scripts FORCE
1652
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1653
%.o: %.c prepare scripts FORCE
1654
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1655
%.lst: %.c prepare scripts FORCE
1656
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1657
%.s: %.S prepare scripts FORCE
1658
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1659
%.o: %.S prepare scripts FORCE
1660
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1661 1662
%.symtypes: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1663 1664
%.ll: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1665

1666
# Modules
S
Sam Ravnborg 已提交
1667 1668 1669 1670
/: prepare scripts FORCE
	$(cmd_crmodverdir)
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
	$(build)=$(build-dir)
1671
# Make sure the latest headers are built for Documentation
1672
Documentation/ samples/: headers_install
S
Sam Ravnborg 已提交
1673
%/: prepare scripts FORCE
S
Sam Ravnborg 已提交
1674
	$(cmd_crmodverdir)
1675
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1676 1677
	$(build)=$(build-dir)
%.ko: prepare scripts FORCE
S
Sam Ravnborg 已提交
1678
	$(cmd_crmodverdir)
1679
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1680
	$(build)=$(build-dir) $(@:.ko=.o)
S
Sam Ravnborg 已提交
1681
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1682

1683
# FIXME Should go into a make.lib or something
L
Linus Torvalds 已提交
1684 1685 1686 1687 1688 1689 1690 1691
# ===========================================================================

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)

1692
# Run depmod only if we have System.map and depmod is executable
1693
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
M
Michal Marek 已提交
1694
      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1695
                   $(KERNELRELEASE)
1696

S
Sam Ravnborg 已提交
1697
# Create temporary dir for module support files
1698 1699 1700
# 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
1701 1702 1703

# read all saved command lines

1704
cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
L
Linus Torvalds 已提交
1705 1706 1707 1708 1709 1710 1711 1712

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

endif	# skip-makefile

1713
PHONY += FORCE
L
Linus Torvalds 已提交
1714
FORCE:
1715

1716
# Declare the contents of the PHONY variable as phony.  We keep that
1717
# information in a variable so we can use it in if_changed and friends.
1718
.PHONY: $(PHONY)