1 # SPDX-License-Identifier: GPL-2.0
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 # That's our default target when none is given on the command line
18 # We are using a recursive build, so we need to do a little thinking
19 # to get the ordering right.
21 # Most importantly: sub-Makefiles should only ever modify files in
22 # their own directory. If in some directory we have a dependency on
23 # a file in another dir (which doesn't happen often, but it's often
24 # unavoidable when linking the built-in.a targets which finally
25 # turn into vmlinux), we will call a sub make in that other dir, and
26 # after that we are sure that everything which is in that other dir
29 # The only cases where we need to modify files which have global
30 # effects are thus separated out and done before the recursive
31 # descending is started. They are now explicitly listed as the
34 ifneq ($(sub_make_done),1)
36 # Do not use make's built-in rules and variables
37 # (this increases performance and avoids hard-to-debug behaviour)
40 # Avoid funny character set dependencies
44 export LC_COLLATE LC_NUMERIC
46 # Avoid interference with shell env settings
50 # ---------------------------------------------------------------------------
52 # Normally, we echo the whole command before executing it. By making
53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
54 # $(quiet) to choose other forms of output instead, e.g.
56 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
57 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
59 # If $(quiet) is empty, the whole command will be printed.
60 # If it is set to "quiet_", only the short version will be printed.
61 # If it is set to "silent_", nothing will be printed at all, since
62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
64 # A simple variant is to prefix commands with $(Q) - that's useful
65 # for commands that shall be hidden in non-verbose mode.
69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
72 # To put more focus on warnings, be less verbose as default
73 # Use 'make V=1' to see the full commands
75 ifeq ("$(origin V)", "command line")
82 ifeq ($(KBUILD_VERBOSE),1)
90 # If the user is running make -s (silent mode), suppress echoing of
93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
97 export quiet Q KBUILD_VERBOSE
99 # Kbuild will save output files in the current working directory.
100 # This does not need to match to the root of the kernel source tree.
102 # For example, you can do this:
104 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
106 # If you want to save output files in a different location, there are
107 # two syntaxes to specify it.
110 # Use "make O=dir/to/store/output/files/"
112 # 2) Set KBUILD_OUTPUT
113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
119 # Do we want to change the working directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
124 ifneq ($(KBUILD_OUTPUT),)
125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
126 # expand a shell special character '~'. We use a somewhat tedious way here.
127 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
128 $(if $(abs_objtree),, \
129 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
131 # $(realpath ...) resolves symlinks
132 abs_objtree := $(realpath $(abs_objtree))
134 abs_objtree := $(CURDIR)
135 endif # ifneq ($(KBUILD_OUTPUT),)
137 ifeq ($(abs_objtree),$(CURDIR))
138 # Suppress "Entering directory ..." unless we are changing the work directory.
139 MAKEFLAGS += --no-print-directory
144 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
146 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
147 $(error source directory cannot contain spaces or colons)
150 ifneq ($(abs_srctree),$(abs_objtree))
151 # Look for make include files relative to root of kernel src
153 # This does not become effective immediately because MAKEFLAGS is re-parsed
154 # once after the Makefile is read. We need to invoke sub-make.
155 MAKEFLAGS += --include-dir=$(abs_srctree)
159 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
163 # Cancel implicit rules for this Makefile.
164 $(lastword $(MAKEFILE_LIST)): ;
167 export abs_srctree abs_objtree
168 export sub_make_done := 1
170 ifeq ($(need-sub-make),1)
172 PHONY += $(MAKECMDGOALS) sub-make
174 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
177 # Invoke a second make in the output directory, passing relevant variables
179 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
181 endif # need-sub-make
182 endif # sub_make_done
184 # We process the rest of the Makefile if this is the final invocation of make
185 ifeq ($(need-sub-make),)
187 # Do not print "Entering directory ...",
188 # but we want to display it when entering to the output directory
189 # so that IDEs/editors are able to understand relative filenames.
190 MAKEFLAGS += --no-print-directory
192 # Call a source code checker (by default, "sparse") as part of the
195 # Use 'make C=1' to enable checking of only re-compiled files.
196 # Use 'make C=2' to enable checking of *all* source files, regardless
197 # of whether they are re-compiled or not.
199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
200 # including where to get the "sparse" utility.
202 ifeq ("$(origin C)", "command line")
203 KBUILD_CHECKSRC = $(C)
205 ifndef KBUILD_CHECKSRC
209 # Use make M=dir to specify directory of external module to build
210 # Old syntax make ... SUBDIRS=$PWD is still supported
211 # Setting the environment variable KBUILD_EXTMOD take precedence
213 $(warning ================= WARNING ================)
214 $(warning 'SUBDIRS' will be removed after Linux 5.3)
216 $(warning If you are building an individual subdirectory)
217 $(warning in the kernel tree, you can do like this:)
218 $(warning $$ make path/to/dir/you/want/to/build/)
219 $(warning (Do not forget the trailing slash))
221 $(warning If you are building an external module,)
222 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
223 $(warning ==========================================)
224 KBUILD_EXTMOD ?= $(SUBDIRS)
227 ifeq ("$(origin M)", "command line")
228 KBUILD_EXTMOD := $(M)
231 ifeq ($(abs_srctree),$(abs_objtree))
232 # building in the source tree
235 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
236 # building in a subdirectory of the source tree
239 srctree := $(abs_srctree)
243 # KBUILD_SRC is only used to distinguish in-tree/out-of-tree build.
244 # Replace it with $(srctree) or something.
245 KBUILD_SRC := $(abs_srctree)
248 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
256 export srctree objtree VPATH
258 # To make sure we do not include .config for any of the *config targets
259 # catch them early, and hand them over to scripts/kconfig/Makefile
260 # It is allowed to specify more targets when calling make, including
261 # mixing *config targets and build targets.
262 # For example 'make oldconfig all'.
263 # Detect when mixed targets is specified, and make a second invocation
264 # of make so .config is not included in this case either (for *config).
266 version_h := include/generated/uapi/linux/version.h
267 old_version_h := include/linux/version.h
269 clean-targets := %clean mrproper cleandocs
270 no-dot-config-targets := $(clean-targets) \
271 cscope gtags TAGS tags help% %docs check% coccicheck \
272 $(version_h) headers headers_% archheaders archscripts \
273 %asm-generic kernelversion %src-pkg
274 no-sync-config-targets := $(no-dot-config-targets) install %install \
282 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
283 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
288 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
289 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
294 ifneq ($(KBUILD_EXTMOD),)
298 ifeq ($(KBUILD_EXTMOD),)
299 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
301 ifneq ($(words $(MAKECMDGOALS)),1)
307 # For "make -j clean all", "make -j mrproper defconfig all", etc.
308 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
309 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
314 # install and modules_install need also be processed one by one
315 ifneq ($(filter install,$(MAKECMDGOALS)),)
316 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
321 ifeq ($(mixed-targets),1)
322 # ===========================================================================
323 # We're called with mixed targets (*config and build targets).
324 # Handle them one by one.
326 PHONY += $(MAKECMDGOALS) __build_one_by_one
328 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
333 for i in $(MAKECMDGOALS); do \
334 $(MAKE) -f $(srctree)/Makefile $$i; \
339 include scripts/Kbuild.include
341 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
342 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
343 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
344 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
346 include scripts/subarch.include
348 # Cross compiling and selecting different set of gcc/bin-utils
349 # ---------------------------------------------------------------------------
351 # When performing cross compilation for other architectures ARCH shall be set
352 # to the target architecture. (See arch/* for the possibilities).
353 # ARCH can be set during invocation of make:
355 # Another way is to have ARCH set in the environment.
356 # The default ARCH is the host where make is executed.
358 # CROSS_COMPILE specify the prefix used for all executables used
359 # during compilation. Only gcc and related bin-utils executables
360 # are prefixed with $(CROSS_COMPILE).
361 # CROSS_COMPILE can be set on the command line
362 # make CROSS_COMPILE=ia64-linux-
363 # Alternatively CROSS_COMPILE can be set in the environment.
364 # Default value for CROSS_COMPILE is not to prefix executables
365 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
368 # Architecture as present in compile.h
369 UTS_MACHINE := $(ARCH)
372 # Additional ARCH settings for x86
376 ifeq ($(ARCH),x86_64)
380 # Additional ARCH settings for sparc
381 ifeq ($(ARCH),sparc32)
384 ifeq ($(ARCH),sparc64)
388 # Additional ARCH settings for sh
393 KCONFIG_CONFIG ?= .config
394 export KCONFIG_CONFIG
396 # SHELL used by kbuild
397 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
398 else if [ -x /bin/bash ]; then echo /bin/bash; \
399 else echo sh; fi ; fi)
401 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
402 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
403 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
407 KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
408 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
410 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
411 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
412 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
414 # Make variables (CC, etc...)
415 AS = $(CROSS_COMPILE)as
416 LD = $(CROSS_COMPILE)ld
417 CC = $(CROSS_COMPILE)gcc
419 AR = $(CROSS_COMPILE)ar
420 NM = $(CROSS_COMPILE)nm
421 STRIP = $(CROSS_COMPILE)strip
422 OBJCOPY = $(CROSS_COMPILE)objcopy
423 OBJDUMP = $(CROSS_COMPILE)objdump
428 INSTALLKERNEL := installkernel
429 DEPMOD = /sbin/depmod
436 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
437 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
446 # Use USERINCLUDE when you must reference the UAPI directories only.
448 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
449 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
450 -I$(srctree)/include/uapi \
451 -I$(objtree)/include/generated/uapi \
452 -include $(srctree)/include/linux/kconfig.h
454 # Use LINUXINCLUDE when you must reference the include/ directory.
455 # Needed to be compatible with the O= option
457 -I$(srctree)/arch/$(SRCARCH)/include \
458 -I$(objtree)/arch/$(SRCARCH)/include/generated \
459 $(if $(filter .,$(srctree)),,-I$(srctree)/include) \
460 -I$(objtree)/include \
463 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
464 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
465 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
466 -Werror=implicit-function-declaration -Werror=implicit-int \
467 -Wno-format-security \
469 KBUILD_CPPFLAGS := -D__KERNEL__
470 KBUILD_AFLAGS_KERNEL :=
471 KBUILD_CFLAGS_KERNEL :=
472 KBUILD_AFLAGS_MODULE := -DMODULE
473 KBUILD_CFLAGS_MODULE := -DMODULE
474 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
476 GCC_PLUGINS_CFLAGS :=
478 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
479 export CPP AR NM STRIP OBJCOPY OBJDUMP PAHOLE KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
480 export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
481 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
483 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
484 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
485 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
486 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
487 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
488 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
489 export KBUILD_ARFLAGS
491 # When compiling out-of-tree modules, put MODVERDIR in the module
492 # tree rather than in the kernel tree. The kernel tree might
494 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
496 # Files to ignore in find ... statements
498 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
499 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
501 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
502 --exclude CVS --exclude .pc --exclude .hg --exclude .git
504 # ===========================================================================
505 # Rules shared between *config targets and build targets
507 # Basic helpers built in scripts/basic/
508 PHONY += scripts_basic
510 $(Q)$(MAKE) $(build)=scripts/basic
511 $(Q)rm -f .tmp_quiet_recordmcount
513 PHONY += outputmakefile
514 # outputmakefile generates a Makefile in the output directory, if using a
515 # separate output directory. This allows convenient use of make in the
517 # At the same time when output Makefile generated, generate .gitignore to
518 # ignore whole output directory
521 $(Q)ln -fsn $(srctree) source
522 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
523 $(Q)test -e .gitignore || \
524 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
527 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
528 ifneq ($(CROSS_COMPILE),)
529 CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%))
530 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
531 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
532 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
534 ifneq ($(GCC_TOOLCHAIN),)
535 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
537 ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
538 CLANG_FLAGS += -no-integrated-as
540 CLANG_FLAGS += -Werror=unknown-warning-option
541 KBUILD_CFLAGS += $(CLANG_FLAGS)
542 KBUILD_AFLAGS += $(CLANG_FLAGS)
546 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
547 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
548 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
549 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
550 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
552 ifeq ($(config-targets),1)
553 # ===========================================================================
554 # *config targets only - make sure prerequisites are updated, and descend
555 # in scripts/kconfig to make the *config target
557 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
558 # KBUILD_DEFCONFIG may point out an alternative default configuration
559 # used for 'make defconfig'
560 include arch/$(SRCARCH)/Makefile
561 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
563 config: scripts_basic outputmakefile FORCE
564 $(Q)$(MAKE) $(build)=scripts/kconfig $@
566 %config: scripts_basic outputmakefile FORCE
567 $(Q)$(MAKE) $(build)=scripts/kconfig $@
570 # ===========================================================================
571 # Build targets only - this includes vmlinux, arch specific targets, clean
572 # targets and others. In general all targets except *config targets.
574 # If building an external module we do not care about the all: rule
575 # but instead _all depend on modules
577 ifeq ($(KBUILD_EXTMOD),)
583 # Decide whether to build built-in, modular, or both.
584 # Normally, just do built-in.
589 # If we have only "make modules", don't compile built-in objects.
590 # When we're building modules with modversions, we need to consider
591 # the built-in objects during the descend as well, in order to
592 # make sure the checksums are up to date before we record them.
594 ifeq ($(MAKECMDGOALS),modules)
595 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
598 # If we have "make <whatever> modules", compile modules
599 # in addition to whatever we do anyway.
600 # Just "make" or "make all" shall build modules as well
602 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
606 ifeq ($(MAKECMDGOALS),)
610 export KBUILD_MODULES KBUILD_BUILTIN
612 ifeq ($(dot-config),1)
613 include include/config/auto.conf
616 ifeq ($(KBUILD_EXTMOD),)
617 # Objects we will link into vmlinux / subdirs we need to visit
619 drivers-y := drivers/ sound/
620 drivers-$(CONFIG_SAMPLES) += samples/
625 endif # KBUILD_EXTMOD
627 # The all: target is the default when no target is given on the
629 # This allow a user to issue only 'make' to build a kernel including modules
630 # Defaults to vmlinux, but the arch makefile usually adds further targets
633 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
634 $(call cc-option,-fno-tree-loop-im) \
635 $(call cc-disable-warning,maybe-uninitialized,)
638 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
639 ifdef CONFIG_FUNCTION_TRACER
640 CC_FLAGS_FTRACE := -pg
643 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
644 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
645 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
646 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
647 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
648 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
649 export RETPOLINE_CFLAGS
650 export RETPOLINE_VDSO_CFLAGS
652 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
653 # values of the respective KBUILD_* variables
657 include arch/$(SRCARCH)/Makefile
659 ifeq ($(dot-config),1)
660 ifeq ($(may-sync-config),1)
661 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
662 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
663 # because some architectures define CROSS_COMPILE there.
664 include include/config/auto.conf.cmd
668 @echo >&2 '*** Configuration file "$@" not found!'
670 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
671 @echo >&2 '*** "make menuconfig" or "make xconfig").'
675 # The actual configuration files used during the build are stored in
676 # include/generated/ and include/config/. Update them if .config is newer than
677 # include/config/auto.conf (which mirrors .config).
679 # This exploits the 'multi-target pattern rule' trick.
680 # The syncconfig should be executed only once to make all the targets.
681 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
682 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
684 # External modules and some install targets need include/generated/autoconf.h
685 # and include/config/auto.conf but do not care if they are up-to-date.
686 # Use auto.conf to trigger the test
687 PHONY += include/config/auto.conf
689 include/config/auto.conf:
690 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
692 echo >&2 " ERROR: Kernel configuration is invalid."; \
693 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
694 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
698 endif # may-sync-config
699 endif # $(dot-config)
701 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
702 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
703 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
704 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
705 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
707 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
713 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
714 KBUILD_CFLAGS += -Wno-maybe-uninitialized
717 # Tell gcc to never replace conditional load with a non-conditional one
718 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
720 include scripts/Makefile.kcov
721 include scripts/Makefile.gcc-plugins
723 ifdef CONFIG_READABLE_ASM
724 # Disable optimizations that make assembler listings hard to read.
725 # reorder blocks reorders the control in the function
726 # ipa clone creates specialized cloned functions
727 # partial inlining inlines only parts of functions
728 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
729 $(call cc-option,-fno-ipa-cp-clone,) \
730 $(call cc-option,-fno-partial-inlining)
733 ifneq ($(CONFIG_FRAME_WARN),0)
734 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
737 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
738 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
739 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
741 KBUILD_CFLAGS += $(stackp-flags-y)
743 ifdef CONFIG_CC_IS_CLANG
744 KBUILD_CPPFLAGS += -Qunused-arguments
745 KBUILD_CFLAGS += -Wno-format-invalid-specifier
746 KBUILD_CFLAGS += -Wno-gnu
747 # Quiet clang warning: comparison of unsigned expression < 0 is always false
748 KBUILD_CFLAGS += -Wno-tautological-compare
749 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
750 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
751 # See modpost pattern 2
752 KBUILD_CFLAGS += -mno-global-merge
755 # These warnings generated too much noise in a regular build.
756 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
757 KBUILD_CFLAGS += -Wno-unused-but-set-variable
760 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
761 ifdef CONFIG_FRAME_POINTER
762 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
764 # Some targets (ARM with Thumb2, for example), can't be built with frame
765 # pointers. For those, we don't have FUNCTION_TRACER automatically
766 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
767 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
768 # -fomit-frame-pointer with FUNCTION_TRACER.
769 ifndef CONFIG_FUNCTION_TRACER
770 KBUILD_CFLAGS += -fomit-frame-pointer
774 # Initialize all stack variables with a pattern, if desired.
775 ifdef CONFIG_INIT_STACK_ALL
776 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
779 DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
781 ifdef CONFIG_DEBUG_INFO
782 ifdef CONFIG_DEBUG_INFO_SPLIT
783 DEBUG_CFLAGS += -gsplit-dwarf
787 KBUILD_AFLAGS += -Wa,-gdwarf-2
789 ifdef CONFIG_DEBUG_INFO_DWARF4
790 DEBUG_CFLAGS += -gdwarf-4
793 ifdef CONFIG_DEBUG_INFO_REDUCED
794 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
795 $(call cc-option,-fno-var-tracking)
798 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
801 ifdef CONFIG_FUNCTION_TRACER
802 ifdef CONFIG_FTRACE_MCOUNT_RECORD
803 # gcc 5 supports generating the mcount tables directly
804 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
805 CC_FLAGS_FTRACE += -mrecord-mcount
806 export CC_USING_RECORD_MCOUNT := 1
808 ifdef CONFIG_HAVE_NOP_MCOUNT
809 ifeq ($(call cc-option-yn, -mnop-mcount),y)
810 CC_FLAGS_FTRACE += -mnop-mcount
811 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
815 ifdef CONFIG_HAVE_FENTRY
816 ifeq ($(call cc-option-yn, -mfentry),y)
817 CC_FLAGS_FTRACE += -mfentry
818 CC_FLAGS_USING += -DCC_USING_FENTRY
821 export CC_FLAGS_FTRACE
822 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
823 KBUILD_AFLAGS += $(CC_FLAGS_USING)
824 ifdef CONFIG_DYNAMIC_FTRACE
825 ifdef CONFIG_HAVE_C_RECORDMCOUNT
826 BUILD_C_RECORDMCOUNT := y
827 export BUILD_C_RECORDMCOUNT
832 # We trigger additional mismatches with less inlining
833 ifdef CONFIG_DEBUG_SECTION_MISMATCH
834 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
837 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
838 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
839 LDFLAGS_vmlinux += --gc-sections
842 ifdef CONFIG_LIVEPATCH
843 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
846 # arch Makefile may override CC so keep this after arch Makefile is included
847 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
849 # warn about C99 declaration after statement
850 KBUILD_CFLAGS += -Wdeclaration-after-statement
852 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
853 KBUILD_CFLAGS += -Wvla
855 # disable pointer signed / unsigned warnings in gcc 4.0
856 KBUILD_CFLAGS += -Wno-pointer-sign
858 # disable stringop warnings in gcc 8+
859 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
861 # disable invalid "can't wrap" optimizations for signed / pointers
862 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
864 # clang sets -fmerge-all-constants by default as optimization, but this
865 # is non-conforming behavior for C and in fact breaks the kernel, so we
866 # need to disable it here generally.
867 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
869 # for gcc -fno-merge-all-constants disables everything, but it is fine
870 # to have actual conforming behavior enabled.
871 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
873 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
874 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
876 # conserve stack if available
877 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
879 # Prohibit date/time macros, which would make the build non-deterministic
880 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
882 # enforce correct pointer usage
883 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
885 # Require designated initializers for all marked structures
886 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
888 # change __FILE__ to the relative path from the srctree
889 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
891 # use the deterministic mode of AR if available
892 KBUILD_ARFLAGS := $(call ar-option,D)
894 include scripts/Makefile.kasan
895 include scripts/Makefile.extrawarn
896 include scripts/Makefile.ubsan
898 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
900 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
901 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
902 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
904 # Use --build-id when available.
905 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
906 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
907 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
909 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
910 LDFLAGS_vmlinux += $(call ld-option, -X,)
913 # insure the checker run with the right endianness
914 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
916 # the checker needs the correct machine size
917 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
919 # Default kernel image to build when no specific target is given.
920 # KBUILD_IMAGE may be overruled on the command line or
921 # set in the environment
922 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
924 export KBUILD_IMAGE ?= vmlinux
927 # INSTALL_PATH specifies where to place the updated kernel and system map
928 # images. Default is /boot, but you can set it to other values
929 export INSTALL_PATH ?= /boot
932 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
933 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
934 # an argument if needed. Otherwise it defaults to the kernel install path
936 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
939 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
940 # relocations required by build roots. This is not defined in the
941 # makefile but the argument can be passed to make if needed.
944 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
948 # INSTALL_MOD_STRIP, if defined, will cause modules to be
949 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
950 # the default option --strip-debug will be used. Otherwise,
951 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
953 ifdef INSTALL_MOD_STRIP
954 ifeq ($(INSTALL_MOD_STRIP),1)
955 mod_strip_cmd = $(STRIP) --strip-debug
957 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
958 endif # INSTALL_MOD_STRIP=1
961 endif # INSTALL_MOD_STRIP
964 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
965 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
966 # or CONFIG_MODULE_COMPRESS_XZ.
968 mod_compress_cmd = true
969 ifdef CONFIG_MODULE_COMPRESS
970 ifdef CONFIG_MODULE_COMPRESS_GZIP
971 mod_compress_cmd = gzip -n -f
972 endif # CONFIG_MODULE_COMPRESS_GZIP
973 ifdef CONFIG_MODULE_COMPRESS_XZ
974 mod_compress_cmd = xz -f
975 endif # CONFIG_MODULE_COMPRESS_XZ
976 endif # CONFIG_MODULE_COMPRESS
977 export mod_compress_cmd
979 ifdef CONFIG_MODULE_SIG_ALL
980 $(eval $(call config_filename,MODULE_SIG_KEY))
982 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
988 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
990 ifdef CONFIG_STACK_VALIDATION
991 has_libelf := $(call try-run,\
992 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
993 ifeq ($(has_libelf),1)
994 objtool_target := tools/objtool FORCE
996 SKIP_STACK_VALIDATION := 1
997 export SKIP_STACK_VALIDATION
1003 ifeq ($(KBUILD_EXTMOD),)
1004 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1006 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1007 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1008 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1010 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1011 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1012 $(drivers-) $(net-) $(libs-) $(virt-))))
1014 init-y := $(patsubst %/, %/built-in.a, $(init-y))
1015 core-y := $(patsubst %/, %/built-in.a, $(core-y))
1016 drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
1017 net-y := $(patsubst %/, %/built-in.a, $(net-y))
1018 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1019 libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1020 virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1022 # Externally visible symbols (used by link-vmlinux.sh)
1023 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1024 $(drivers-y) $(net-y) $(virt-y)
1025 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1026 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1027 export LDFLAGS_vmlinux
1028 # used by scripts/package/Makefile
1029 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1031 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1033 # Recurse until adjust_autoksyms.sh is satisfied
1034 PHONY += autoksyms_recursive
1035 autoksyms_recursive: $(vmlinux-deps)
1036 ifdef CONFIG_TRIM_UNUSED_KSYMS
1037 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1038 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1041 # For the kernel to actually contain only the needed exported symbols,
1042 # we have to build modules as well to determine what those symbols are.
1043 # (this can be evaluated only once include/config/auto.conf has been included)
1044 ifdef CONFIG_TRIM_UNUSED_KSYMS
1048 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1051 $(Q)mkdir -p $(dir $@)
1054 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1056 # Final link of vmlinux with optional arch pass after final link
1057 cmd_link-vmlinux = \
1058 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
1059 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1061 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1062 +$(call if_changed,link-vmlinux)
1066 # The actual objects are generated when descending,
1067 # make sure no implicit rule kicks in
1068 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1070 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1071 # Preset locale variables to speed up the build process. Limit locale
1072 # tweaks to this spot to avoid wrong language settings when running
1073 # make menuconfig etc.
1074 # Error messages still appears in the original language
1076 PHONY += $(vmlinux-dirs)
1077 $(vmlinux-dirs): prepare
1078 $(Q)$(MAKE) $(build)=$@ need-builtin=1
1080 filechk_kernel.release = \
1081 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1083 # Store (new) KERNELRELEASE string in include/config/kernel.release
1084 include/config/kernel.release: FORCE
1085 $(call filechk,kernel.release)
1087 # Additional helpers built in scripts/
1088 # Carefully list dependencies so we do not try to build scripts twice
1091 scripts: scripts_basic scripts_dtc
1092 $(Q)$(MAKE) $(build)=$(@)
1094 # Things we need to do before we recursively start building the kernel
1095 # or the modules are listed in "prepare".
1096 # A multi level approach is used. prepareN is processed before prepareN-1.
1097 # archprepare is used in arch Makefiles and when processed asm symlink,
1098 # version.h and scripts_basic is processed / created.
1100 PHONY += prepare archprepare prepare1 prepare3
1102 # prepare3 is used to check if we are building in a separate output directory,
1104 # 1) Check that make has not been executed in the kernel src $(srctree)
1105 prepare3: include/config/kernel.release
1106 ifneq ($(srctree),.)
1107 @$(kecho) ' Using $(srctree) as source for kernel'
1108 $(Q)if [ -f $(srctree)/.config -o \
1109 -d $(srctree)/include/config -o \
1110 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1111 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1112 echo >&2 " in the '$(srctree)' directory.";\
1117 prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
1118 include/generated/utsrelease.h
1121 archprepare: archheaders archscripts prepare1 scripts
1123 prepare0: archprepare
1124 $(Q)$(MAKE) $(build)=scripts/mod
1125 $(Q)$(MAKE) $(build)=.
1127 # All the preparing..
1128 prepare: prepare0 prepare-objtool
1130 # Support for using generic headers in asm-generic
1131 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1133 PHONY += asm-generic uapi-asm-generic
1134 asm-generic: uapi-asm-generic
1135 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1136 generic=include/asm-generic
1138 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1139 generic=include/uapi/asm-generic
1141 PHONY += prepare-objtool
1142 prepare-objtool: $(objtool_target)
1143 ifeq ($(SKIP_STACK_VALIDATION),1)
1144 ifdef CONFIG_UNWINDER_ORC
1145 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1148 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1152 # Generate some files
1153 # ---------------------------------------------------------------------------
1155 # KERNELRELEASE can change from a few different places, meaning version.h
1156 # needs to be updated, so this check is forced on all builds
1159 define filechk_utsrelease.h
1160 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1161 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1164 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1167 define filechk_version.h
1168 echo \#define LINUX_VERSION_CODE $(shell \
1169 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1170 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1174 $(call filechk,version.h)
1175 $(Q)rm -f $(old_version_h)
1177 include/generated/utsrelease.h: include/config/kernel.release FORCE
1178 $(call filechk,utsrelease.h)
1182 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1183 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1185 # ---------------------------------------------------------------------------
1188 #Default location for installed headers
1189 export INSTALL_HDR_PATH = $(objtree)/usr
1191 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1192 cmd_headers_install = \
1193 mkdir -p $(INSTALL_HDR_PATH); \
1194 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1195 usr/include $(INSTALL_HDR_PATH)
1197 PHONY += headers_install
1198 headers_install: headers
1199 $(call cmd,headers_install)
1201 PHONY += archheaders archscripts
1203 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1206 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1207 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1208 $(error Headers not exportable for the $(SRCARCH) architecture))
1209 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1210 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1212 PHONY += headers_check
1213 headers_check: headers
1214 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1215 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1217 ifdef CONFIG_HEADERS_INSTALL
1221 ifdef CONFIG_HEADERS_CHECK
1225 PHONY += scripts_unifdef
1226 scripts_unifdef: scripts_basic
1227 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1229 # ---------------------------------------------------------------------------
1234 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1236 PHONY += kselftest-clean
1238 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1240 PHONY += kselftest-merge
1242 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1243 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1244 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1245 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1247 # ---------------------------------------------------------------------------
1250 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1251 dtstree := arch/$(SRCARCH)/boot/dts
1256 %.dtb: prepare3 scripts_dtc
1257 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1259 PHONY += dtbs dtbs_install dt_binding_check
1260 dtbs dtbs_check: prepare3 scripts_dtc
1261 $(Q)$(MAKE) $(build)=$(dtstree)
1263 dtbs_check: export CHECK_DTBS=1
1264 dtbs_check: dt_binding_check
1267 $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1269 ifdef CONFIG_OF_EARLY_FLATTREE
1275 PHONY += scripts_dtc
1276 scripts_dtc: scripts_basic
1277 $(Q)$(MAKE) $(build)=scripts/dtc
1279 dt_binding_check: scripts_dtc
1280 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1282 # ---------------------------------------------------------------------------
1285 ifdef CONFIG_MODULES
1287 # By default, build modules as well
1293 # A module can be listed more than once in obj-m resulting in
1294 # duplicate lines in modules.order files. Those are removed
1295 # using awk while concatenating to the final file.
1298 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1299 @$(kecho) ' Building modules, stage 2.';
1300 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1301 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1303 modules.order: $(vmlinux-dirs)
1304 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1306 modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs))
1308 modules.builtin: $(modbuiltin-dirs)
1309 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1311 PHONY += $(modbuiltin-dirs)
1312 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1313 # here to make it self-healing in case somebody accidentally removes it.
1314 $(modbuiltin-dirs): include/config/tristate.conf
1315 $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1317 # Target to prepare building external modules
1318 PHONY += modules_prepare
1319 modules_prepare: prepare
1321 # Target to install modules
1322 PHONY += modules_install
1323 modules_install: _modinst_ _modinst_post
1327 @rm -rf $(MODLIB)/kernel
1328 @rm -f $(MODLIB)/source
1329 @mkdir -p $(MODLIB)/kernel
1330 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1331 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1332 rm -f $(MODLIB)/build ; \
1333 ln -s $(CURDIR) $(MODLIB)/build ; \
1335 @cp -f $(objtree)/modules.order $(MODLIB)/
1336 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1337 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1338 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1340 # This depmod is only for convenience to give the initial
1341 # boot a modules.dep even before / is mounted read-write. However the
1342 # boot script depmod is the master version.
1343 PHONY += _modinst_post
1344 _modinst_post: _modinst_
1347 ifeq ($(CONFIG_MODULE_SIG), y)
1348 PHONY += modules_sign
1350 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1353 else # CONFIG_MODULES
1355 # Modules not configured
1356 # ---------------------------------------------------------------------------
1358 PHONY += modules modules_install
1359 modules modules_install:
1361 @echo >&2 "The present kernel configuration has modules disabled."
1362 @echo >&2 "Type 'make config' and enable loadable module support."
1363 @echo >&2 "Then build a kernel with module support enabled."
1367 endif # CONFIG_MODULES
1370 # Cleaning is done on three levels.
1371 # make clean Delete most generated files
1372 # Leave enough to build external modules
1373 # make mrproper Delete the current configuration, and all generated files
1374 # make distclean Remove editor backup files, patch leftover files and the like
1376 # Directories & files removed with 'make clean'
1377 CLEAN_DIRS += $(MODVERDIR) include/ksym
1378 CLEAN_FILES += modules.builtin.modinfo
1380 # Directories & files removed with 'make mrproper'
1381 MRPROPER_DIRS += include/config include/generated \
1382 arch/$(SRCARCH)/include/generated .tmp_objdiff
1383 MRPROPER_FILES += .config .config.old .version \
1384 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1385 signing_key.pem signing_key.priv signing_key.x509 \
1386 x509.genkey extra_certificates signing_key.x509.keyid \
1387 signing_key.x509.signer vmlinux-gdb.py
1389 # clean - Delete most, but leave enough to build external modules
1391 clean: rm-dirs := $(CLEAN_DIRS)
1392 clean: rm-files := $(CLEAN_FILES)
1393 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs))
1395 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1397 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1400 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1401 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1403 clean: archclean vmlinuxclean
1405 # mrproper - Delete all generated files, including .config
1407 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1408 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1409 mrproper-dirs := $(addprefix _mrproper_,scripts)
1411 PHONY += $(mrproper-dirs) mrproper
1413 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1415 mrproper: clean $(mrproper-dirs)
1424 @find $(srctree) $(RCS_FIND_IGNORE) \
1425 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1426 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1427 -o -name 'core' \) \
1428 -type f -print | xargs rm -f
1431 # Packaging of the kernel to various formats
1432 # ---------------------------------------------------------------------------
1433 package-dir := scripts/package
1436 $(Q)$(MAKE) $(build)=$(package-dir) $@
1437 %pkg: include/config/kernel.release FORCE
1438 $(Q)$(MAKE) $(build)=$(package-dir) $@
1441 # Brief documentation of the typical targets used
1442 # ---------------------------------------------------------------------------
1444 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1445 boards := $(sort $(notdir $(boards)))
1446 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1447 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1451 @echo 'Cleaning targets:'
1452 @echo ' clean - Remove most generated files but keep the config and'
1453 @echo ' enough build support to build external modules'
1454 @echo ' mrproper - Remove all generated files + config + various backup files'
1455 @echo ' distclean - mrproper + remove editor backup and patch files'
1457 @echo 'Configuration targets:'
1458 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1460 @echo 'Other generic targets:'
1461 @echo ' all - Build all targets marked with [*]'
1462 @echo '* vmlinux - Build the bare kernel'
1463 @echo '* modules - Build all modules'
1464 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1465 @echo ' dir/ - Build all files in dir and below'
1466 @echo ' dir/file.[ois] - Build specified target only'
1467 @echo ' dir/file.ll - Build the LLVM assembly file'
1468 @echo ' (requires compiler support for LLVM assembly generation)'
1469 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1470 @echo ' (requires a recent binutils and recent build (System.map))'
1471 @echo ' dir/file.ko - Build module including final link'
1472 @echo ' modules_prepare - Set up for building external modules'
1473 @echo ' tags/TAGS - Generate tags file for editors'
1474 @echo ' cscope - Generate cscope index'
1475 @echo ' gtags - Generate GNU GLOBAL index'
1476 @echo ' kernelrelease - Output the release version string (use with make -s)'
1477 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1478 @echo ' image_name - Output the image name (use with make -s)'
1479 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1480 echo ' (default: $(INSTALL_HDR_PATH))'; \
1482 @echo 'Static analysers:'
1483 @echo ' checkstack - Generate a list of stack hogs'
1484 @echo ' namespacecheck - Name space analysis on compiled kernel'
1485 @echo ' versioncheck - Sanity check on version.h usage'
1486 @echo ' includecheck - Check for duplicate included header files'
1487 @echo ' export_report - List the usages of all exported symbols'
1488 @echo ' headers_check - Sanity check on exported headers'
1489 @echo ' headerdep - Detect inclusion cycles in headers'
1490 @echo ' coccicheck - Check with Coccinelle'
1492 @echo 'Kernel selftest:'
1493 @echo ' kselftest - Build and run kernel selftest (run as root)'
1494 @echo ' Build, install, and boot kernel before'
1495 @echo ' running kselftest on it'
1496 @echo ' kselftest-clean - Remove all generated kselftest files'
1497 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1501 echo 'Devicetree:'; \
1502 echo '* dtbs - Build device tree blobs for enabled boards'; \
1503 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1506 @echo 'Userspace tools targets:'
1507 @echo ' use "make tools/help"'
1508 @echo ' or "cd tools; make help"'
1510 @echo 'Kernel packaging:'
1511 @$(MAKE) $(build)=$(package-dir) help
1513 @echo 'Documentation targets:'
1514 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1516 @echo 'Architecture specific targets ($(SRCARCH)):'
1517 @$(if $(archhelp),$(archhelp),\
1518 echo ' No architecture specific help defined for $(SRCARCH)')
1521 $(foreach b, $(boards), \
1522 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1524 @$(if $(board-dirs), \
1525 $(foreach b, $(board-dirs), \
1526 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1527 printf " %-16s - Show all of the above\\n" help-boards; \
1530 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1531 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1532 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1533 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1534 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1535 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1536 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1537 @echo ' 1: warnings which may be relevant and do not occur too often'
1538 @echo ' 2: warnings which occur quite often but may still be relevant'
1539 @echo ' 3: more obscure warnings, can most likely be ignored'
1540 @echo ' Multiple levels can be combined with W=12 or W=123'
1542 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1543 @echo 'For further info see the ./README file'
1546 help-board-dirs := $(addprefix help-,$(board-dirs))
1548 help-boards: $(help-board-dirs)
1550 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1552 $(help-board-dirs): help-%:
1553 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1554 @$(if $(boards-per-dir), \
1555 $(foreach b, $(boards-per-dir), \
1556 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1560 # Documentation targets
1561 # ---------------------------------------------------------------------------
1562 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1563 linkcheckdocs dochelp refcheckdocs
1564 PHONY += $(DOC_TARGETS)
1565 $(DOC_TARGETS): scripts_basic FORCE
1566 $(Q)$(MAKE) $(build)=Documentation $@
1569 # ---------------------------------------------------------------------------
1571 PHONY += scripts_gdb
1572 scripts_gdb: prepare0
1573 $(Q)$(MAKE) $(build)=scripts/gdb
1574 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1576 ifdef CONFIG_GDB_SCRIPTS
1580 else # KBUILD_EXTMOD
1583 # External module support.
1584 # When building external modules the kernel used as basis is considered
1585 # read-only, and no consistency checks are made and the make
1586 # system is not used on the basis kernel. If updates are required
1587 # in the basis kernel ordinary make commands (without M=...) must
1590 # The following are the only valid targets when building external
1592 # make M=dir clean Delete all automatically generated files
1593 # make M=dir modules Make all modules in specified dir
1594 # make M=dir Same as 'make M=dir modules'
1595 # make M=dir modules_install
1596 # Install the modules built in the module directory
1597 # Assumes install directory is already created
1599 # We are always building modules
1602 PHONY += $(objtree)/Module.symvers
1603 $(objtree)/Module.symvers:
1604 @test -e $(objtree)/Module.symvers || ( \
1606 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1607 echo " is missing; modules will have no dependencies and modversions."; \
1610 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1611 PHONY += $(module-dirs) modules
1612 $(module-dirs): prepare $(objtree)/Module.symvers
1613 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1615 modules: $(module-dirs)
1616 @$(kecho) ' Building modules, stage 2.';
1617 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1619 PHONY += modules_install
1620 modules_install: _emodinst_ _emodinst_post
1622 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1625 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1626 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1628 PHONY += _emodinst_post
1629 _emodinst_post: _emodinst_
1632 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1634 PHONY += $(clean-dirs) clean
1636 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1638 clean: rm-dirs := $(MODVERDIR)
1639 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1643 @echo ' Building external modules.'
1644 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1646 @echo ' modules - default target, build the module(s)'
1647 @echo ' modules_install - install the module'
1648 @echo ' clean - remove generated files in module directory only'
1654 endif # KBUILD_EXTMOD
1656 clean: $(clean-dirs)
1659 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1660 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1662 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1663 -o -name '*.dwo' -o -name '*.lst' \
1665 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1666 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1667 -o -name '*.asn1.[ch]' \
1668 -o -name '*.symtypes' -o -name 'modules.order' \
1669 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1670 -o -name '*.c.[012]*.*' \
1672 -o -name '*.gcno' \) -type f -print | xargs rm -f
1674 # Generate tags for editors
1675 # ---------------------------------------------------------------------------
1676 quiet_cmd_tags = GEN $@
1677 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1679 tags TAGS cscope gtags: FORCE
1682 # Scripts to check various things for consistency
1683 # ---------------------------------------------------------------------------
1685 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1688 find $(srctree)/* $(RCS_FIND_IGNORE) \
1689 -name '*.[hcS]' -type f -print | sort \
1690 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1693 find $(srctree)/* $(RCS_FIND_IGNORE) \
1694 -name '*.[hcS]' -type f -print | sort \
1695 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1698 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1701 $(PERL) $(srctree)/scripts/namespace.pl
1704 $(PERL) $(srctree)/scripts/export_report.pl
1706 PHONY += checkstack kernelrelease kernelversion image_name
1708 # UML needs a little special treatment here. It wants to use the host
1709 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1710 # else wants $(ARCH), including people doing cross-builds, which means
1711 # that $(SUBARCH) doesn't work here.
1713 CHECKSTACK_ARCH := $(SUBARCH)
1715 CHECKSTACK_ARCH := $(ARCH)
1718 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1719 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1722 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1725 @echo $(KERNELVERSION)
1728 @echo $(KBUILD_IMAGE)
1730 # Clear a bunch of variables before executing the submake
1732 ifeq ($(quiet),silent_)
1737 $(Q)mkdir -p $(objtree)/tools
1738 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1741 $(Q)mkdir -p $(objtree)/tools
1742 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1745 # ---------------------------------------------------------------------------
1746 # Single targets are compatible with:
1747 # - build with mixed source and output
1748 # - build with separate output dir 'make O=...'
1749 # - external modules
1751 # target-dir => where to store outputfile
1752 # build-dir => directory in kernel source tree to use
1754 build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1755 build-dir = $(patsubst %/,%,$(dir $(build-target)))
1758 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1760 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1761 %.lst: prepare FORCE
1762 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1764 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1766 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1767 %.symtypes: prepare FORCE
1768 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1770 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1777 $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir)
1779 # FIXME Should go into a make.lib or something
1780 # ===========================================================================
1782 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1783 cmd_rmdirs = rm -rf $(rm-dirs)
1785 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1786 cmd_rmfiles = rm -f $(rm-files)
1788 # Run depmod only if we have System.map and depmod is executable
1789 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1790 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1793 # Create temporary dir for module support files
1794 # clean it up only when building all modules
1795 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1796 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1798 # read saved command lines for existing targets
1799 existing-targets := $(wildcard $(sort $(targets)))
1801 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1803 endif # ifeq ($(config-targets),1)
1804 endif # ifeq ($(mixed-targets),1)
1805 endif # need-sub-make
1810 # Declare the contents of the PHONY variable as phony. We keep that
1811 # information in a variable so we can use it in if_changed and friends.