Makefile 58.4 KB
Newer Older
1
# SPDX-License-Identifier: GPL-2.0
Linus Torvalds's avatar
Linus Torvalds committed
2
VERSION = 4
Linus Torvalds's avatar
Linus Torvalds committed
3
PATCHLEVEL = 14
Greg Kroah-Hartman's avatar
Greg Kroah-Hartman committed
4
SUBLEVEL = 4
Linus Torvalds's avatar
Linus Torvalds committed
5
EXTRAVERSION =
Greg Kroah-Hartman's avatar
Greg Kroah-Hartman committed
6
NAME = Petit Gorille
Linus Torvalds's avatar
Linus Torvalds committed
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
# 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)
Linus Torvalds's avatar
Linus Torvalds committed
18

19
# Avoid funny character set dependencies
20
unexport LC_ALL
21 22
LC_COLLATE=C
LC_NUMERIC=C
23
export LC_COLLATE LC_NUMERIC
24

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

Linus Torvalds's avatar
Linus Torvalds committed
28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
# We are using a recursive build, so we need to do a little thinking
# to get the ordering right.
#
# Most importantly: sub-Makefiles should only ever modify files in
# their own directory. If in some directory we have a dependency on
# a file in another dir (which doesn't happen often, but it's often
# unavoidable when linking the built-in.o targets which finally
# turn into vmlinux), we will call a sub make in that other dir, and
# after that we are sure that everything which is in that other dir
# is now up to date.
#
# The only cases where we need to modify files which have global
# effects are thus separated out and done before the recursive
# descending is started. They are now explicitly listed as the
# prepare rule.

44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
# 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.
#
Linus Torvalds's avatar
Linus Torvalds committed
67 68 69
# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands

70 71
ifeq ("$(origin V)", "command line")
  KBUILD_VERBOSE = $(V)
Linus Torvalds's avatar
Linus Torvalds committed
72 73 74 75 76
endif
ifndef KBUILD_VERBOSE
  KBUILD_VERBOSE = 0
endif

77 78 79 80 81 82 83 84 85 86 87
ifeq ($(KBUILD_VERBOSE),1)
  quiet =
  Q =
else
  quiet=quiet_
  Q = @
endif

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

88
ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
89
  quiet=silent_
90
  tools_silent=s
91 92 93 94
endif

export quiet Q KBUILD_VERBOSE

Linus Torvalds's avatar
Linus Torvalds committed
95 96 97 98 99
# 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/"
100
#
Linus Torvalds's avatar
Linus Torvalds committed
101 102 103 104 105 106 107 108 109
# 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.

110 111
# 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.
Linus Torvalds's avatar
Linus Torvalds committed
112 113 114 115
ifeq ($(KBUILD_SRC),)

# OK, Make called in directory where kernel src resides
# Do we want to locate output files in a separate directory?
116 117
ifeq ("$(origin O)", "command line")
  KBUILD_OUTPUT := $(O)
Linus Torvalds's avatar
Linus Torvalds committed
118 119 120
endif

# That's our default target when none is given on the command line
121
PHONY := _all
Linus Torvalds's avatar
Linus Torvalds committed
122 123
_all:

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

Linus Torvalds's avatar
Linus Torvalds committed
131 132 133
ifneq ($(KBUILD_OUTPUT),)
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
134 135
KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
								&& /bin/pwd)
Linus Torvalds's avatar
Linus Torvalds committed
136
$(if $(KBUILD_OUTPUT),, \
137
     $(error failed to create output directory "$(saved-output)"))
Linus Torvalds's avatar
Linus Torvalds committed
138

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

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

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))
Linus Torvalds's avatar
Linus Torvalds committed
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.
#
Cao jin's avatar
Cao jin committed
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

Linus Torvalds's avatar
Linus Torvalds committed
190 191
# If building an external module we do not care about the all: rule
# but instead _all depend on modules
192
PHONY += all
Linus Torvalds's avatar
Linus Torvalds committed
193 194 195 196 197 198
ifeq ($(KBUILD_EXTMOD),)
_all: all
else
_all: modules
endif

199 200 201 202 203 204 205 206 207 208 209
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
210
objtree		:= .
Linus Torvalds's avatar
Linus Torvalds committed
211 212 213
src		:= $(srctree)
obj		:= $(objtree)

214
VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds's avatar
Linus Torvalds committed
215

216
export srctree objtree VPATH
Linus Torvalds's avatar
Linus Torvalds committed
217 218 219 220

# 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,
221
# then ARCH is assigned, getting whatever value it gets normally, and
Linus Torvalds's avatar
Linus Torvalds committed
222 223
# SUBARCH is subsequently ignored.

224 225
SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
				  -e s/sun4u/sparc64/ \
Linus Torvalds's avatar
Linus Torvalds committed
226
				  -e s/arm.*/arm/ -e s/sa110/arm/ \
227
				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
Paul Mundt's avatar
Paul Mundt committed
228
				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
229
				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
Linus Torvalds's avatar
Linus Torvalds committed
230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246

# 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.
Roland McGrath's avatar
Roland McGrath committed
247 248
# A third alternative is to store a setting in .config so that plain
# "make" in the configured kernel build directory always uses that.
Linus Torvalds's avatar
Linus Torvalds committed
249 250
# Default value for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
251
ARCH		?= $(SUBARCH)
Roland McGrath's avatar
Roland McGrath committed
252
CROSS_COMPILE	?= $(CONFIG_CROSS_COMPILE:"%"=%)
Linus Torvalds's avatar
Linus Torvalds committed
253 254

# Architecture as present in compile.h
255 256
UTS_MACHINE 	:= $(ARCH)
SRCARCH 	:= $(ARCH)
Linus Torvalds's avatar
Linus Torvalds committed
257

258 259 260 261 262 263 264
# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
        SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
        SRCARCH := x86
endif
265

Sam Ravnborg's avatar
Sam Ravnborg committed
266
# Additional ARCH settings for sparc
Namhyung Kim's avatar
Namhyung Kim committed
267 268 269
ifeq ($(ARCH),sparc32)
       SRCARCH := sparc
endif
270
ifeq ($(ARCH),sparc64)
Sam Ravnborg's avatar
Sam Ravnborg committed
271
       SRCARCH := sparc
272
endif
273

274 275 276 277 278
# Additional ARCH settings for sh
ifeq ($(ARCH),sh64)
       SRCARCH := sh
endif

279
# Additional ARCH settings for tile
280 281 282
ifeq ($(ARCH),tilepro)
       SRCARCH := tile
endif
283 284 285 286
ifeq ($(ARCH),tilegx)
       SRCARCH := tile
endif

Sam Ravnborg's avatar
Sam Ravnborg committed
287 288 289
# Where to locate arch specific headers
hdr-arch  := $(SRCARCH)

290
KCONFIG_CONFIG	?= .config
291
export KCONFIG_CONFIG
292

Linus Torvalds's avatar
Linus Torvalds committed
293 294 295 296 297
# 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)

298 299 300 301
HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
HOST_LFS_LIBS := $(shell getconf LFS_LIBS)

302 303
HOSTCC       = gcc
HOSTCXX      = g++
304 305 306 307 308
HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
HOST_LOADLIBES := $(HOST_LFS_LIBS)
Linus Torvalds's avatar
Linus Torvalds committed
309

310 311 312 313 314
ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
		-Wno-missing-field-initializers -fno-delete-null-pointer-checks
endif

315 316
# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.
Linus Torvalds's avatar
Linus Torvalds committed
317 318 319 320

KBUILD_MODULES :=
KBUILD_BUILTIN := 1

321 322 323 324
# If we have only "make modules", don't compile built-in objects.
# When we're building modules with modversions, we need to consider
# the built-in objects during the descend as well, in order to
# make sure the checksums are up to date before we record them.
Linus Torvalds's avatar
Linus Torvalds committed
325 326 327 328 329

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

330 331 332
# If we have "make <whatever> modules", compile modules
# in addition to whatever we do anyway.
# Just "make" or "make all" shall build modules as well
Linus Torvalds's avatar
Linus Torvalds committed
333 334 335 336 337 338 339 340 341

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

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

342
export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds's avatar
Linus Torvalds committed
343 344
export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD

345
# We need some generic definitions (do not try to remake the file).
346 347
scripts/Kbuild.include: ;
include scripts/Kbuild.include
Linus Torvalds's avatar
Linus Torvalds committed
348 349 350 351 352 353 354 355 356 357 358 359 360

# Make variables (CC, etc...)
AS		= $(CROSS_COMPILE)as
LD		= $(CROSS_COMPILE)ld
CC		= $(CROSS_COMPILE)gcc
CPP		= $(CC) -E
AR		= $(CROSS_COMPILE)ar
NM		= $(CROSS_COMPILE)nm
STRIP		= $(CROSS_COMPILE)strip
OBJCOPY		= $(CROSS_COMPILE)objcopy
OBJDUMP		= $(CROSS_COMPILE)objdump
AWK		= awk
GENKSYMS	= scripts/genksyms/genksyms
361
INSTALLKERNEL  := installkernel
Linus Torvalds's avatar
Linus Torvalds committed
362 363
DEPMOD		= /sbin/depmod
PERL		= perl
364
PYTHON		= python
Linus Torvalds's avatar
Linus Torvalds committed
365 366
CHECK		= sparse

367 368
CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
		  -Wbitwise -Wno-return-void $(CF)
369
NOSTDINC_FLAGS  =
370 371 372
CFLAGS_MODULE   =
AFLAGS_MODULE   =
LDFLAGS_MODULE  =
Linus Torvalds's avatar
Linus Torvalds committed
373 374
CFLAGS_KERNEL	=
AFLAGS_KERNEL	=
375
LDFLAGS_vmlinux =
376
CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
Emese Revfy's avatar
Emese Revfy committed
377
CFLAGS_KCOV	:= $(call cc-option,-fsanitize-coverage=trace-pc,)
Linus Torvalds's avatar
Linus Torvalds committed
378 379


380 381 382
# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE    := \
		-I$(srctree)/arch/$(hdr-arch)/include/uapi \
383
		-I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
384
		-I$(srctree)/include/uapi \
385
		-I$(objtree)/include/generated/uapi \
386 387
                -include $(srctree)/include/linux/kconfig.h

Linus Torvalds's avatar
Linus Torvalds committed
388 389
# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
390 391
LINUXINCLUDE    := \
		-I$(srctree)/arch/$(hdr-arch)/include \
392
		-I$(objtree)/arch/$(hdr-arch)/include/generated \
393
		$(if $(KBUILD_SRC), -I$(srctree)/include) \
394 395
		-I$(objtree)/include \
		$(USERINCLUDE)
Linus Torvalds's avatar
Linus Torvalds committed
396

397
KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds's avatar
Linus Torvalds committed
398

399
KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
400
		   -fno-strict-aliasing -fno-common -fshort-wchar \
401
		   -Werror-implicit-function-declaration \
402
		   -Wno-format-security \
403 404
		   -std=gnu89 $(call cc-option,-fno-PIE)

405

406 407
KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
408
KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
409 410 411
KBUILD_AFLAGS_MODULE  := -DMODULE
KBUILD_CFLAGS_MODULE  := -DMODULE
KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Linus Torvalds's avatar
Linus Torvalds committed
412

Roman Zippel's avatar
Roman Zippel committed
413 414
# Read KERNELRELEASE from include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
415
KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
416

417
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
418
export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
419
export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
420
export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
421
export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds's avatar
Linus Torvalds committed
422

423
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Dmitry Vyukov's avatar
Dmitry Vyukov committed
424
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
425
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
426
export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
427
export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
428
export KBUILD_ARFLAGS
Linus Torvalds's avatar
Linus Torvalds committed
429 430 431 432 433 434 435 436

# 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

437 438 439
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
Jesper Juhl's avatar
Jesper Juhl committed
440 441
export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds's avatar
Linus Torvalds committed
442 443 444 445

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

446
# Basic helpers built in scripts/basic/
447
PHONY += scripts_basic
Linus Torvalds's avatar
Linus Torvalds committed
448 449
scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic
450
	$(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds's avatar
Linus Torvalds committed
451

452 453 454
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

455
PHONY += outputmakefile
456 457 458
# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
Linus Torvalds's avatar
Linus Torvalds committed
459
outputmakefile:
460
ifneq ($(KBUILD_SRC),)
461
	$(Q)ln -fsn $(srctree) source
462 463 464
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif
Linus Torvalds's avatar
Linus Torvalds committed
465

Sam Ravnborg's avatar
Sam Ravnborg committed
466
# Support for using generic headers in asm-generic
467 468
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
Sam Ravnborg's avatar
Sam Ravnborg committed
469
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
470
	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
471
uapi-asm-generic:
472 473
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
Sam Ravnborg's avatar
Sam Ravnborg committed
474

Linus Torvalds's avatar
Linus Torvalds committed
475 476 477 478
# 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.
479
# For example 'make oldconfig all'.
Linus Torvalds's avatar
Linus Torvalds committed
480 481 482
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

483
version_h := include/generated/uapi/linux/version.h
484
old_version_h := include/linux/version.h
David Howells's avatar
David Howells committed
485

486
no-dot-config-targets := clean mrproper distclean \
487
			 cscope gtags TAGS tags help% %docs check% coccicheck \
David Howells's avatar
David Howells committed
488
			 $(version_h) headers_% archheaders archscripts \
489
			 kernelversion %src-pkg
Linus Torvalds's avatar
Linus Torvalds committed
490 491 492 493 494 495 496 497 498 499 500 501 502 503

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,$(MAKECMDGOALS)),)
                config-targets := 1
504
                ifneq ($(words $(MAKECMDGOALS)),1)
Linus Torvalds's avatar
Linus Torvalds committed
505 506 507 508
                        mixed-targets := 1
                endif
        endif
endif
509
# install and modules_install need also be processed one by one
510 511 512 513 514
ifneq ($(filter install,$(MAKECMDGOALS)),)
        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
	        mixed-targets := 1
        endif
endif
Linus Torvalds's avatar
Linus Torvalds committed
515 516 517 518 519 520

ifeq ($(mixed-targets),1)
# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.

521 522 523 524 525 526 527 528 529 530
PHONY += $(MAKECMDGOALS) __build_one_by_one

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

__build_one_by_one:
	$(Q)set -e; \
	for i in $(MAKECMDGOALS); do \
		$(MAKE) -f $(srctree)/Makefile $$i; \
	done
Linus Torvalds's avatar
Linus Torvalds committed
531 532 533 534 535 536 537 538 539 540

else
ifeq ($(config-targets),1)
# ===========================================================================
# *config targets only - make sure prerequisites are updated, and descend
# in scripts/kconfig to make the *config target

# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
# KBUILD_DEFCONFIG may point out an alternative default configuration
# used for 'make defconfig'
541
include arch/$(SRCARCH)/Makefile
542
export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds's avatar
Linus Torvalds committed
543

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

%config: scripts_basic outputmakefile FORCE
Linus Torvalds's avatar
Linus Torvalds committed
548 549 550 551 552 553 554 555 556 557
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

else
# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.

ifeq ($(KBUILD_EXTMOD),)
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
558
# in parallel
559
PHONY += scripts
560
scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
Emese Revfy's avatar
Emese Revfy committed
561
	 asm-generic gcc-plugins
Linus Torvalds's avatar
Linus Torvalds committed
562 563 564 565
	$(Q)$(MAKE) $(build)=$(@)

# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
566
drivers-y	:= drivers/ sound/ firmware/
Linus Torvalds's avatar
Linus Torvalds committed
567 568 569
net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
570
virt-y		:= virt/
Linus Torvalds's avatar
Linus Torvalds committed
571 572 573
endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
574 575
# Read in config
-include include/config/auto.conf
Linus Torvalds's avatar
Linus Torvalds committed
576

577
ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds's avatar
Linus Torvalds committed
578 579
# Read in dependencies to all Kconfig* files, make sure to run
# oldconfig if changes are detected.
580
-include include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
581 582

# To avoid any implicit rule to kick in, define an empty command
583
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds's avatar
Linus Torvalds committed
584

585
# If .config is newer than include/config/auto.conf, someone tinkered
586
# with it and forgot to run make oldconfig.
587
# if auto.conf.cmd is missing then we are probably in a cleaned tree so
588
# we execute the config step to be sure to catch updated Kconfig files
589
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds's avatar
Linus Torvalds committed
590
	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
591
else
592
# external modules needs include/generated/autoconf.h and include/config/auto.conf
593 594 595 596
# 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:
597
	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
Michal Marek's avatar
Michal Marek committed
598 599 600 601 602
	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 ;							\
603 604 605
	/bin/false)

endif # KBUILD_EXTMOD
606

Linus Torvalds's avatar
Linus Torvalds committed
607 608
else
# Dummy target needed, because used as prerequisite
609
include/config/auto.conf: ;
610
endif # $(dot-config)
Linus Torvalds's avatar
Linus Torvalds committed
611

612 613 614 615 616 617 618
# 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

Linus Torvalds's avatar
Linus Torvalds committed
619 620 621
# The all: target is the default when no target is given on the
# command line.
# This allow a user to issue only 'make' to build a kernel including modules
Michal Marek's avatar
Michal Marek committed
622
# Defaults to vmlinux, but the arch makefile usually adds further targets
Linus Torvalds's avatar
Linus Torvalds committed
623 624
all: vmlinux

625 626 627 628 629
# 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 :=
630
include arch/$(SRCARCH)/Makefile
631 632

KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
633
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
634 635 636
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)
637

Linus Torvalds's avatar
Linus Torvalds committed
638
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
639 640
KBUILD_CFLAGS	+= $(call cc-option,-Oz,-Os)
KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
Linus Torvalds's avatar
Linus Torvalds committed
641
else
642
ifdef CONFIG_PROFILE_ALL_BRANCHES
643
KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)
644 645 646
else
KBUILD_CFLAGS   += -O2
endif
Linus Torvalds's avatar
Linus Torvalds committed
647 648
endif

649 650 651
KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
			$(call cc-disable-warning,maybe-uninitialized,))

652 653 654
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

655 656 657 658 659 660
# check for 'asm goto'
ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
	KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
endif

Emese Revfy's avatar
Emese Revfy committed
661 662
include scripts/Makefile.gcc-plugins

Andi Kleen's avatar
Andi Kleen committed
663 664 665 666 667 668 669 670 671 672
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

673
ifneq ($(CONFIG_FRAME_WARN),0)
674 675 676
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

677 678 679
# This selects the stack protector compiler flag. Testing it is delayed
# until after .config has been reprocessed, in the prepare-compiler-check
# target.
680
ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
681
  stackp-flag := -fstack-protector
682
  stackp-name := REGULAR
683 684
else
ifdef CONFIG_CC_STACKPROTECTOR_STRONG
685
  stackp-flag := -fstack-protector-strong
686
  stackp-name := STRONG
687 688 689
else
  # Force off for distro compilers that enable stack protector by default.
  stackp-flag := $(call cc-option, -fno-stack-protector)
Tejun Heo's avatar
Tejun Heo committed
690
endif
691
endif
692 693
# Find arch-specific stack protector compiler sanity-checking script.
ifdef CONFIG_CC_STACKPROTECTOR
694 695
  stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
  stackp-check := $(wildcard $(stackp-path))
696
endif
697
KBUILD_CFLAGS += $(stackp-flag)
698

Michal Marek's avatar
Michal Marek committed
699
ifeq ($(cc-name),clang)
700
ifneq ($(CROSS_COMPILE),)
701
CLANG_TARGET	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
702 703 704
GCC_TOOLCHAIN	:= $(realpath $(dir $(shell which $(LD)))/..)
endif
ifneq ($(GCC_TOOLCHAIN),)
705
CLANG_GCC_TC	:= --gcc-toolchain=$(GCC_TOOLCHAIN)
706 707 708
endif
KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
709 710 711 712
KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
713
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
714 715 716 717 718 719
# 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,)
720
KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
721 722
KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
723 724
else

725
# These warnings generated too much noise in a regular build.
726
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
727
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
728
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
729
endif
730

Linus Torvalds's avatar
Linus Torvalds committed
731
ifdef CONFIG_FRAME_POINTER
732
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds's avatar
Linus Torvalds committed
733
else
734 735 736 737 738 739
# 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
740
KBUILD_CFLAGS	+= -fomit-frame-pointer
Linus Torvalds's avatar
Linus Torvalds committed
741
endif
742
endif
Linus Torvalds's avatar
Linus Torvalds committed
743

744 745
KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)

Linus Torvalds's avatar
Linus Torvalds committed
746
ifdef CONFIG_DEBUG_INFO
747 748 749
ifdef CONFIG_DEBUG_INFO_SPLIT
KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
else
750
KBUILD_CFLAGS	+= -g
751
endif
752
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
Linus Torvalds's avatar
Linus Torvalds committed
753
endif
754 755 756
ifdef CONFIG_DEBUG_INFO_DWARF4
KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
endif
Linus Torvalds's avatar
Linus Torvalds committed
757

758
ifdef CONFIG_DEBUG_INFO_REDUCED
759 760
KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
		   $(call cc-option,-fno-var-tracking)
761 762
endif

763
ifdef CONFIG_FUNCTION_TRACER
764 765 766 767
ifndef CC_FLAGS_FTRACE
CC_FLAGS_FTRACE := -pg
endif
export CC_FLAGS_FTRACE
768 769 770
ifdef CONFIG_HAVE_FENTRY
CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
endif
771
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
772
KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
773
ifdef CONFIG_DYNAMIC_FTRACE
774
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
775 776 777 778
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
779 780
endif

781 782 783 784 785
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

786 787 788 789 790
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
KBUILD_CFLAGS	+= $(call cc-option,-ffunction-sections,)
KBUILD_CFLAGS	+= $(call cc-option,-fdata-sections,)
endif

791
# arch Makefile may override CC so keep this after arch Makefile is included
792
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
793 794
CHECKFLAGS     += $(NOSTDINC_FLAGS)

Linus Torvalds's avatar
Linus Torvalds committed
795
# warn about C99 declaration after statement
796
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds's avatar
Linus Torvalds committed
797

798
# disable pointer signed / unsigned warnings in gcc 4.0
799
KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
Linus Torvalds's avatar
Linus Torvalds committed
800

801
# disable invalid "can't wrap" optimizations for signed / pointers
802
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
803

804 805 806
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

807 808 809 810 811 812
# 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)

813 814 815
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

816 817 818
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

819 820 821
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

822 823 824
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

825 826
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
827
include scripts/Makefile.ubsan
828

829 830 831 832 833
# 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)
834

Roland McGrath's avatar
Roland McGrath committed
835
# Use --build-id when available.
836
LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
837
			      $(call cc-ldoption, -Wl$(comma)--build-id,))
838
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
Roland McGrath's avatar
Roland McGrath committed
839 840
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

841 842 843 844
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
LDFLAGS_vmlinux	+= $(call ld-option, --gc-sections,)
endif

845
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
846
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
847 848
endif

Linus Torvalds's avatar
Linus Torvalds committed
849
# Default kernel image to build when no specific target is given.
850
# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds's avatar
Linus Torvalds committed
851 852 853 854 855 856 857 858 859 860
# 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

861 862 863 864 865 866 867
#
# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
# an argument if needed. Otherwise it defaults to the kernel install path
#
export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)

Linus Torvalds's avatar
Linus Torvalds committed
868 869 870
#
# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
# relocations required by build roots.  This is not defined in the
871
# makefile but the argument can be passed to make if needed.
Linus Torvalds's avatar
Linus Torvalds committed
872 873
#

874
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds's avatar
Linus Torvalds committed
875 876
export MODLIB

877
#
878 879 880 881
# 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.
882

883 884
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
885
mod_strip_cmd = $(STRIP) --strip-debug
886
else
887
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
888 889
endif # INSTALL_MOD_STRIP=1
else
890
mod_strip_cmd = true
891 892 893
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

894 895 896 897 898 899 900
# 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
901
    mod_compress_cmd = gzip -n -f
902 903
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
904
    mod_compress_cmd = xz -f
905 906 907 908
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

909 910 911
# Select initial ramdisk compression format, default is gzip(1).
# This shall be used by the dracut(8) tool while creating an initramfs image.
#
Jan Beulich's avatar
Jan Beulich committed
912 913 914 915 916 917
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
918 919 920
# do not export INITRD_COMPRESS, since we didn't actually
# choose a sane default compression above.
# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
Linus Torvalds's avatar
Linus Torvalds committed
921

922
ifdef CONFIG_MODULE_SIG_ALL
923 924 925
$(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
926 927 928 929 930
else
mod_sign_cmd = true
endif
export mod_sign_cmd

931 932 933 934 935 936
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
937 938 939 940 941
    ifdef CONFIG_ORC_UNWINDER
      $(error "Cannot generate ORC metadata for CONFIG_ORC_UNWINDER=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
    else
      $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
    endif
942 943 944 945 946
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

947

Linus Torvalds's avatar
Linus Torvalds committed
948
ifeq ($(KBUILD_EXTMOD),)
949
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds's avatar
Linus Torvalds committed
950 951 952

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
953
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
Linus Torvalds's avatar
Linus Torvalds committed
954 955

vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
956
		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
Linus Torvalds's avatar
Linus Torvalds committed
957 958 959 960 961 962

init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
963
libs-y2		:= $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
964
virt-y		:= $(patsubst %/, %/built-in.o, $(virt-y))
Linus Torvalds's avatar
Linus Torvalds committed
965

966
# Externally visible symbols (used by link-vmlinux.sh)
967
export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
968 969
export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
export KBUILD_VMLINUX_LIBS := $(libs-y1)
970
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
971
export LDFLAGS_vmlinux
972
# used by scripts/package/Makefile
973
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
974

975
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
Linus Torvalds's avatar
Linus Torvalds committed
976

977 978 979 980 981
# Include targets which we want to execute sequentially if the rest of the
# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
# evaluated more than once.
PHONY += vmlinux_prereq
vmlinux_prereq: $(vmlinux-deps) FORCE
982
ifdef CONFIG_HEADERS_CHECK
983
	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
984
endif
Jan Kiszka's avatar
Jan Kiszka committed
985
ifdef CONFIG_GDB_SCRIPTS
986
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
987
endif
988
ifdef CONFIG_TRIM_UNUSED_KSYMS
989
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
990
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
991
endif
992 993 994

# standalone target for easier testing
include/generated/autoksyms.h: FORCE
995
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
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
vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1005
	+$(call if_changed,link-vmlinux)
1006

1007 1008 1009 1010 1011
# Build samples along the rest of the kernel
ifdef CONFIG_SAMPLES
vmlinux-dirs += samples
endif

1012
# The actual objects are generated when descending,
Linus Torvalds's avatar
Linus Torvalds committed
1013
# make sure no implicit rule kicks in
1014
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
Linus Torvalds's avatar
Linus Torvalds committed
1015 1016 1017 1018 1019 1020 1021

# 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

1022
PHONY += $(vmlinux-dirs)
1023
$(vmlinux-dirs): prepare scripts
Linus Torvalds's avatar
Linus Torvalds committed
1024 1025
	$(Q)$(MAKE) $(build)=$@

1026 1027 1028 1029
define filechk_kernel.release
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
endef

1030
# Store (new) KERNELRELEASE string in include/config/kernel.release
Roman Zippel's avatar
Roman Zippel committed
1031
include/config/kernel.release: include/config/auto.conf FORCE
1032
	$(call filechk,kernel.release)
1033 1034