1 # SPDX-License-Identifier: GPL-2.0
6 NAME = Dare mighty things
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 $(if $(filter __%, $(MAKECMDGOALS)), \
15 $(error targets prefixed with '__' are only for internal use))
17 # That's our default target when none is given on the command line
21 # We are using a recursive build, so we need to do a little thinking
22 # to get the ordering right.
24 # Most importantly: sub-Makefiles should only ever modify files in
25 # their own directory. If in some directory we have a dependency on
26 # a file in another dir (which doesn't happen often, but it's often
27 # unavoidable when linking the built-in.a targets which finally
28 # turn into vmlinux), we will call a sub make in that other dir, and
29 # after that we are sure that everything which is in that other dir
32 # The only cases where we need to modify files which have global
33 # effects are thus separated out and done before the recursive
34 # descending is started. They are now explicitly listed as the
37 ifneq ($(sub_make_done),1)
39 # Do not use make's built-in rules and variables
40 # (this increases performance and avoids hard-to-debug behaviour)
43 # Avoid funny character set dependencies
47 export LC_COLLATE LC_NUMERIC
49 # Avoid interference with shell env settings
53 # ---------------------------------------------------------------------------
55 # Normally, we echo the whole command before executing it. By making
56 # that echo $($(quiet)$(cmd)), we now have the possibility to set
57 # $(quiet) to choose other forms of output instead, e.g.
59 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
62 # If $(quiet) is empty, the whole command will be printed.
63 # If it is set to "quiet_", only the short version will be printed.
64 # If it is set to "silent_", nothing will be printed at all, since
65 # the variable $(silent_cmd_cc_o_c) doesn't exist.
67 # A simple variant is to prefix commands with $(Q) - that's useful
68 # for commands that shall be hidden in non-verbose mode.
72 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
74 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
76 # To put more focus on warnings, be less verbose as default
77 # Use 'make V=1' to see the full commands
79 ifeq ("$(origin V)", "command line")
86 ifeq ($(KBUILD_VERBOSE),1)
94 # If the user is running make -s (silent mode), suppress echoing of
96 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
98 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
99 silence:=$(findstring s,$(firstword -$(MAKEFLAGS)))
101 silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS)))
108 export quiet Q KBUILD_VERBOSE
110 # Kbuild will save output files in the current working directory.
111 # This does not need to match to the root of the kernel source tree.
113 # For example, you can do this:
115 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
117 # If you want to save output files in a different location, there are
118 # two syntaxes to specify it.
121 # Use "make O=dir/to/store/output/files/"
123 # 2) Set KBUILD_OUTPUT
124 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
125 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
127 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
130 # Do we want to change the working directory?
131 ifeq ("$(origin O)", "command line")
132 KBUILD_OUTPUT := $(O)
135 ifneq ($(KBUILD_OUTPUT),)
136 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
137 # expand a shell special character '~'. We use a somewhat tedious way here.
138 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
139 $(if $(abs_objtree),, \
140 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
142 # $(realpath ...) resolves symlinks
143 abs_objtree := $(realpath $(abs_objtree))
145 abs_objtree := $(CURDIR)
146 endif # ifneq ($(KBUILD_OUTPUT),)
148 ifeq ($(abs_objtree),$(CURDIR))
149 # Suppress "Entering directory ..." unless we are changing the work directory.
150 MAKEFLAGS += --no-print-directory
155 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
157 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
158 $(error source directory cannot contain spaces or colons)
161 ifneq ($(abs_srctree),$(abs_objtree))
162 # Look for make include files relative to root of kernel src
164 # This does not become effective immediately because MAKEFLAGS is re-parsed
165 # once after the Makefile is read. We need to invoke sub-make.
166 MAKEFLAGS += --include-dir=$(abs_srctree)
170 this-makefile := $(lastword $(MAKEFILE_LIST))
172 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
173 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
174 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
176 # Cancel implicit rules for this Makefile.
180 export abs_srctree abs_objtree
181 export sub_make_done := 1
183 ifeq ($(need-sub-make),1)
185 PHONY += $(MAKECMDGOALS) __sub-make
187 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
190 # Invoke a second make in the output directory, passing relevant variables
192 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
194 endif # need-sub-make
195 endif # sub_make_done
197 # We process the rest of the Makefile if this is the final invocation of make
198 ifeq ($(need-sub-make),)
200 # Do not print "Entering directory ...",
201 # but we want to display it when entering to the output directory
202 # so that IDEs/editors are able to understand relative filenames.
203 MAKEFLAGS += --no-print-directory
205 # Call a source code checker (by default, "sparse") as part of the
208 # Use 'make C=1' to enable checking of only re-compiled files.
209 # Use 'make C=2' to enable checking of *all* source files, regardless
210 # of whether they are re-compiled or not.
212 # See the file "Documentation/dev-tools/sparse.rst" for more details,
213 # including where to get the "sparse" utility.
215 ifeq ("$(origin C)", "command line")
216 KBUILD_CHECKSRC = $(C)
218 ifndef KBUILD_CHECKSRC
222 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
223 # directory of external module to build. Setting M= takes precedence.
224 ifeq ("$(origin M)", "command line")
225 KBUILD_EXTMOD := $(M)
228 $(if $(word 2, $(KBUILD_EXTMOD)), \
229 $(error building multiple external modules is not supported))
231 export KBUILD_CHECKSRC KBUILD_EXTMOD
233 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
235 ifeq ($(abs_srctree),$(abs_objtree))
236 # building in the source tree
238 building_out_of_srctree :=
240 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
241 # building in a subdirectory of the source tree
244 srctree := $(abs_srctree)
246 building_out_of_srctree := 1
249 ifneq ($(KBUILD_ABS_SRCTREE),)
250 srctree := $(abs_srctree)
256 export building_out_of_srctree 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 dt_binding_check \
275 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
277 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
285 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
286 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
291 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
292 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
297 ifneq ($(KBUILD_EXTMOD),)
301 ifeq ($(KBUILD_EXTMOD),)
302 ifneq ($(filter %config,$(MAKECMDGOALS)),)
304 ifneq ($(words $(MAKECMDGOALS)),1)
310 # We cannot build single targets and the others at the same time
311 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
313 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
318 # For "make -j clean all", "make -j mrproper defconfig all", etc.
319 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
320 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
325 # install and modules_install need also be processed one by one
326 ifneq ($(filter install,$(MAKECMDGOALS)),)
327 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
333 # ===========================================================================
334 # We're called with mixed targets (*config and build targets).
335 # Handle them one by one.
337 PHONY += $(MAKECMDGOALS) __build_one_by_one
339 $(MAKECMDGOALS): __build_one_by_one
344 for i in $(MAKECMDGOALS); do \
345 $(MAKE) -f $(srctree)/Makefile $$i; \
350 include scripts/Kbuild.include
352 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
353 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
354 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
355 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
357 include scripts/subarch.include
359 # Cross compiling and selecting different set of gcc/bin-utils
360 # ---------------------------------------------------------------------------
362 # When performing cross compilation for other architectures ARCH shall be set
363 # to the target architecture. (See arch/* for the possibilities).
364 # ARCH can be set during invocation of make:
366 # Another way is to have ARCH set in the environment.
367 # The default ARCH is the host where make is executed.
369 # CROSS_COMPILE specify the prefix used for all executables used
370 # during compilation. Only gcc and related bin-utils executables
371 # are prefixed with $(CROSS_COMPILE).
372 # CROSS_COMPILE can be set on the command line
373 # make CROSS_COMPILE=ia64-linux-
374 # Alternatively CROSS_COMPILE can be set in the environment.
375 # Default value for CROSS_COMPILE is not to prefix executables
376 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
379 # Architecture as present in compile.h
380 UTS_MACHINE := $(ARCH)
383 # Additional ARCH settings for x86
387 ifeq ($(ARCH),x86_64)
391 # Additional ARCH settings for sparc
392 ifeq ($(ARCH),sparc32)
395 ifeq ($(ARCH),sparc64)
399 # Additional ARCH settings for sh
404 KCONFIG_CONFIG ?= .config
405 export KCONFIG_CONFIG
407 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
408 export KBUILD_DEFCONFIG := defconfig
410 # SHELL used by kbuild
413 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
414 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
415 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
425 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
426 -O2 -fomit-frame-pointer -std=gnu89
427 export KBUILD_USERLDFLAGS :=
429 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
430 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
431 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
432 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
434 # Make variables (CC, etc...)
441 OBJCOPY = llvm-objcopy
442 OBJDUMP = llvm-objdump
443 READELF = llvm-readelf
446 CC = $(CROSS_COMPILE)gcc
447 LD = $(CROSS_COMPILE)ld
448 AR = $(CROSS_COMPILE)ar
449 NM = $(CROSS_COMPILE)nm
450 OBJCOPY = $(CROSS_COMPILE)objcopy
451 OBJDUMP = $(CROSS_COMPILE)objdump
452 READELF = $(CROSS_COMPILE)readelf
453 STRIP = $(CROSS_COMPILE)strip
456 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
460 INSTALLKERNEL := installkernel
475 PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
477 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
478 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
487 # Use USERINCLUDE when you must reference the UAPI directories only.
489 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
490 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
491 -I$(srctree)/include/uapi \
492 -I$(objtree)/include/generated/uapi \
493 -include $(srctree)/include/linux/kconfig.h
495 # Use LINUXINCLUDE when you must reference the include/ directory.
496 # Needed to be compatible with the O= option
498 -I$(srctree)/arch/$(SRCARCH)/include \
499 -I$(objtree)/arch/$(SRCARCH)/include/generated \
500 $(if $(building_out_of_srctree),-I$(srctree)/include) \
501 -I$(objtree)/include \
504 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
505 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
506 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
507 -Werror=implicit-function-declaration -Werror=implicit-int \
508 -Werror=return-type -Wno-format-security \
510 KBUILD_CPPFLAGS := -D__KERNEL__
511 KBUILD_AFLAGS_KERNEL :=
512 KBUILD_CFLAGS_KERNEL :=
513 KBUILD_AFLAGS_MODULE := -DMODULE
514 KBUILD_CFLAGS_MODULE := -DMODULE
515 KBUILD_LDFLAGS_MODULE :=
519 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
520 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
521 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
522 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
523 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
525 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
526 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
527 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
528 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
529 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
532 # Files to ignore in find ... statements
534 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
535 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
537 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
538 --exclude CVS --exclude .pc --exclude .hg --exclude .git
540 # ===========================================================================
541 # Rules shared between *config targets and build targets
543 # Basic helpers built in scripts/basic/
544 PHONY += scripts_basic
546 $(Q)$(MAKE) $(build)=scripts/basic
547 $(Q)rm -f .tmp_quiet_recordmcount
549 PHONY += outputmakefile
550 # Before starting out-of-tree build, make sure the source tree is clean.
551 # outputmakefile generates a Makefile in the output directory, if using a
552 # separate output directory. This allows convenient use of make in the
554 # At the same time when output Makefile generated, generate .gitignore to
555 # ignore whole output directory
557 ifdef building_out_of_srctree
558 $(Q)if [ -f $(srctree)/.config -o \
559 -d $(srctree)/include/config -o \
560 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
562 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
563 echo >&2 "*** in $(abs_srctree)";\
567 $(Q)ln -fsn $(srctree) source
568 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
569 $(Q)test -e .gitignore || \
570 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
573 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
574 ifneq ($(CROSS_COMPILE),)
575 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
576 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
577 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
578 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
580 ifneq ($(GCC_TOOLCHAIN),)
581 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
584 CLANG_FLAGS += -fintegrated-as
586 CLANG_FLAGS += -fno-integrated-as
588 CLANG_FLAGS += -Werror=unknown-warning-option
589 KBUILD_CFLAGS += $(CLANG_FLAGS)
590 KBUILD_AFLAGS += $(CLANG_FLAGS)
594 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
595 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
596 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
597 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
598 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
601 # ===========================================================================
602 # *config targets only - make sure prerequisites are updated, and descend
603 # in scripts/kconfig to make the *config target
605 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
606 # KBUILD_DEFCONFIG may point out an alternative default configuration
607 # used for 'make defconfig'
608 include arch/$(SRCARCH)/Makefile
609 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
611 config: outputmakefile scripts_basic FORCE
612 $(Q)$(MAKE) $(build)=scripts/kconfig $@
614 %config: outputmakefile scripts_basic FORCE
615 $(Q)$(MAKE) $(build)=scripts/kconfig $@
618 # ===========================================================================
619 # Build targets only - this includes vmlinux, arch specific targets, clean
620 # targets and others. In general all targets except *config targets.
622 # If building an external module we do not care about the all: rule
623 # but instead __all depend on modules
625 ifeq ($(KBUILD_EXTMOD),)
631 # Decide whether to build built-in, modular, or both.
632 # Normally, just do built-in.
637 # If we have only "make modules", don't compile built-in objects.
638 ifeq ($(MAKECMDGOALS),modules)
642 # If we have "make <whatever> modules", compile modules
643 # in addition to whatever we do anyway.
644 # Just "make" or "make all" shall build modules as well
646 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
650 ifeq ($(MAKECMDGOALS),)
654 export KBUILD_MODULES KBUILD_BUILTIN
657 include include/config/auto.conf
660 ifeq ($(KBUILD_EXTMOD),)
661 # Objects we will link into vmlinux / subdirs we need to visit
663 drivers-y := drivers/ sound/
664 drivers-$(CONFIG_SAMPLES) += samples/
665 drivers-y += net/ virt/
667 endif # KBUILD_EXTMOD
669 # The all: target is the default when no target is given on the
671 # This allow a user to issue only 'make' to build a kernel including modules
672 # Defaults to vmlinux, but the arch makefile usually adds further targets
675 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
676 $(call cc-option,-fno-tree-loop-im) \
677 $(call cc-disable-warning,maybe-uninitialized,)
680 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
681 ifdef CONFIG_FUNCTION_TRACER
682 CC_FLAGS_FTRACE := -pg
685 ifdef CONFIG_CC_IS_GCC
686 RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
687 RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch-cs-prefix)
688 RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register)
690 ifdef CONFIG_CC_IS_CLANG
691 RETPOLINE_CFLAGS := -mretpoline-external-thunk
692 RETPOLINE_VDSO_CFLAGS := -mretpoline
696 RETHUNK_CFLAGS := -mfunction-return=thunk-extern
697 RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS)
700 export RETPOLINE_CFLAGS
701 export RETPOLINE_VDSO_CFLAGS
703 include arch/$(SRCARCH)/Makefile
706 ifdef may-sync-config
707 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
708 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
709 # because some architectures define CROSS_COMPILE there.
710 include include/config/auto.conf.cmd
714 @echo >&2 '*** Configuration file "$@" not found!'
716 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
717 @echo >&2 '*** "make menuconfig" or "make xconfig").'
721 # The actual configuration files used during the build are stored in
722 # include/generated/ and include/config/. Update them if .config is newer than
723 # include/config/auto.conf (which mirrors .config).
725 # This exploits the 'multi-target pattern rule' trick.
726 # The syncconfig should be executed only once to make all the targets.
727 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
729 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
730 # so you cannot notice that Kconfig is waiting for the user input.
731 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
732 $(Q)$(kecho) " SYNC $@"
733 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
734 else # !may-sync-config
735 # External modules and some install targets need include/generated/autoconf.h
736 # and include/config/auto.conf but do not care if they are up-to-date.
737 # Use auto.conf to trigger the test
738 PHONY += include/config/auto.conf
740 include/config/auto.conf:
741 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
743 echo >&2 " ERROR: Kernel configuration is invalid."; \
744 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
745 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
749 endif # may-sync-config
752 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
753 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
754 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
755 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
756 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
758 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
760 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
762 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
766 # Tell gcc to never replace conditional load with a non-conditional one
767 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
768 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
770 ifdef CONFIG_READABLE_ASM
771 # Disable optimizations that make assembler listings hard to read.
772 # reorder blocks reorders the control in the function
773 # ipa clone creates specialized cloned functions
774 # partial inlining inlines only parts of functions
775 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
776 $(call cc-option,-fno-ipa-cp-clone,) \
777 $(call cc-option,-fno-partial-inlining)
780 ifneq ($(CONFIG_FRAME_WARN),0)
781 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
784 stackp-flags-y := -fno-stack-protector
785 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
786 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
788 KBUILD_CFLAGS += $(stackp-flags-y)
790 ifdef CONFIG_CC_IS_CLANG
791 KBUILD_CPPFLAGS += -Qunused-arguments
792 KBUILD_CFLAGS += -Wno-format-invalid-specifier
793 KBUILD_CFLAGS += -Wno-gnu
794 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
795 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
796 # See modpost pattern 2
797 KBUILD_CFLAGS += -mno-global-merge
800 # Warn about unmarked fall-throughs in switch statement.
801 # Disabled for clang while comment to attribute conversion happens and
802 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
803 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
806 # These warnings generated too much noise in a regular build.
807 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
808 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
810 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
812 # These result in bogus false positives
813 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
815 ifdef CONFIG_FRAME_POINTER
816 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
818 # Some targets (ARM with Thumb2, for example), can't be built with frame
819 # pointers. For those, we don't have FUNCTION_TRACER automatically
820 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
821 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
822 # -fomit-frame-pointer with FUNCTION_TRACER.
823 ifndef CONFIG_FUNCTION_TRACER
824 KBUILD_CFLAGS += -fomit-frame-pointer
828 # Initialize all stack variables with a 0xAA pattern.
829 ifdef CONFIG_INIT_STACK_ALL_PATTERN
830 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
833 # Initialize all stack variables with a zero value.
834 ifdef CONFIG_INIT_STACK_ALL_ZERO
835 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
836 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
837 # https://github.com/llvm/llvm-project/issues/44842
838 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
844 # Workaround for GCC versions < 5.0
845 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
846 ifdef CONFIG_CC_IS_GCC
847 DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
850 ifdef CONFIG_DEBUG_INFO
852 ifdef CONFIG_DEBUG_INFO_SPLIT
853 DEBUG_CFLAGS += -gsplit-dwarf
858 ifdef CONFIG_AS_IS_LLVM
861 KBUILD_AFLAGS += -Wa,-gdwarf-2
864 ifdef CONFIG_DEBUG_INFO_DWARF4
865 DEBUG_CFLAGS += -gdwarf-4
868 ifdef CONFIG_DEBUG_INFO_REDUCED
869 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
870 $(call cc-option,-fno-var-tracking)
873 ifdef CONFIG_DEBUG_INFO_COMPRESSED
874 DEBUG_CFLAGS += -gz=zlib
875 KBUILD_AFLAGS += -gz=zlib
876 KBUILD_LDFLAGS += --compress-debug-sections=zlib
879 endif # CONFIG_DEBUG_INFO
881 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
884 ifdef CONFIG_FUNCTION_TRACER
885 ifdef CONFIG_FTRACE_MCOUNT_RECORD
886 # gcc 5 supports generating the mcount tables directly
887 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
888 CC_FLAGS_FTRACE += -mrecord-mcount
889 export CC_USING_RECORD_MCOUNT := 1
891 ifdef CONFIG_HAVE_NOP_MCOUNT
892 ifeq ($(call cc-option-yn, -mnop-mcount),y)
893 CC_FLAGS_FTRACE += -mnop-mcount
894 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
898 ifdef CONFIG_HAVE_FENTRY
899 ifeq ($(call cc-option-yn, -mfentry),y)
900 CC_FLAGS_FTRACE += -mfentry
901 CC_FLAGS_USING += -DCC_USING_FENTRY
904 export CC_FLAGS_FTRACE
905 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
906 KBUILD_AFLAGS += $(CC_FLAGS_USING)
907 ifdef CONFIG_DYNAMIC_FTRACE
908 ifdef CONFIG_HAVE_C_RECORDMCOUNT
909 BUILD_C_RECORDMCOUNT := y
910 export BUILD_C_RECORDMCOUNT
915 # We trigger additional mismatches with less inlining
916 ifdef CONFIG_DEBUG_SECTION_MISMATCH
917 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
920 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
921 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
922 LDFLAGS_vmlinux += --gc-sections
925 ifdef CONFIG_SHADOW_CALL_STACK
926 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
927 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
931 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
932 KBUILD_CFLAGS += -falign-functions=32
935 # arch Makefile may override CC so keep this after arch Makefile is included
936 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
938 # warn about C99 declaration after statement
939 KBUILD_CFLAGS += -Wdeclaration-after-statement
941 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
942 KBUILD_CFLAGS += -Wvla
944 # disable pointer signed / unsigned warnings in gcc 4.0
945 KBUILD_CFLAGS += -Wno-pointer-sign
947 # disable stringop warnings in gcc 8+
948 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
950 # We'll want to enable this eventually, but it's not going away for 5.7 at least
951 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
952 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
953 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
955 # Another good warning that we'll want to enable eventually
956 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
958 # Enabled with W=2, disabled by default as noisy
959 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
961 # disable invalid "can't wrap" optimizations for signed / pointers
962 KBUILD_CFLAGS += -fno-strict-overflow
964 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
965 KBUILD_CFLAGS += -fno-stack-check
967 # conserve stack if available
968 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
970 # Prohibit date/time macros, which would make the build non-deterministic
971 KBUILD_CFLAGS += -Werror=date-time
973 # enforce correct pointer usage
974 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
976 # Require designated initializers for all marked structures
977 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
979 # change __FILE__ to the relative path from the srctree
980 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
982 # include additional Makefiles when needed
983 include-y := scripts/Makefile.extrawarn
984 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
985 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
986 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
987 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
988 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
990 include $(addprefix $(srctree)/, $(include-y))
992 # scripts/Makefile.gcc-plugins is intentionally included last.
993 # Do not add $(call cc-option,...) below this line. When you build the kernel
994 # from the clean source tree, the GCC plugins do not exist at this point.
996 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
997 KBUILD_CPPFLAGS += $(KCPPFLAGS)
998 KBUILD_AFLAGS += $(KAFLAGS)
999 KBUILD_CFLAGS += $(KCFLAGS)
1001 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1002 LDFLAGS_vmlinux += --build-id=sha1
1004 KBUILD_LDFLAGS += -z noexecstack
1005 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
1007 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1008 LDFLAGS_vmlinux += $(call ld-option, -X,)
1011 ifeq ($(CONFIG_RELR),y)
1012 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1015 # We never want expected sections to be placed heuristically by the
1016 # linker. All sections should be explicitly named in the linker script.
1017 ifdef CONFIG_LD_ORPHAN_WARN
1018 LDFLAGS_vmlinux += --orphan-handling=warn
1021 # Align the bit size of userspace programs with the kernel
1022 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1023 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1025 # make the checker run with the right architecture
1026 CHECKFLAGS += --arch=$(ARCH)
1028 # insure the checker run with the right endianness
1029 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1031 # the checker needs the correct machine size
1032 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1034 # Default kernel image to build when no specific target is given.
1035 # KBUILD_IMAGE may be overruled on the command line or
1036 # set in the environment
1037 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1038 # this default value
1039 export KBUILD_IMAGE ?= vmlinux
1042 # INSTALL_PATH specifies where to place the updated kernel and system map
1043 # images. Default is /boot, but you can set it to other values
1044 export INSTALL_PATH ?= /boot
1047 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1048 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1049 # an argument if needed. Otherwise it defaults to the kernel install path
1051 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1054 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1055 # relocations required by build roots. This is not defined in the
1056 # makefile but the argument can be passed to make if needed.
1059 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1063 # INSTALL_MOD_STRIP, if defined, will cause modules to be
1064 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1065 # the default option --strip-debug will be used. Otherwise,
1066 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1068 ifdef INSTALL_MOD_STRIP
1069 ifeq ($(INSTALL_MOD_STRIP),1)
1070 mod_strip_cmd = $(STRIP) --strip-debug
1072 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1073 endif # INSTALL_MOD_STRIP=1
1075 mod_strip_cmd = true
1076 endif # INSTALL_MOD_STRIP
1077 export mod_strip_cmd
1079 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1080 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1081 # or CONFIG_MODULE_COMPRESS_XZ.
1083 mod_compress_cmd = true
1084 ifdef CONFIG_MODULE_COMPRESS
1085 ifdef CONFIG_MODULE_COMPRESS_GZIP
1086 mod_compress_cmd = $(KGZIP) -n -f
1087 endif # CONFIG_MODULE_COMPRESS_GZIP
1088 ifdef CONFIG_MODULE_COMPRESS_XZ
1089 mod_compress_cmd = $(XZ) -f
1090 endif # CONFIG_MODULE_COMPRESS_XZ
1091 endif # CONFIG_MODULE_COMPRESS
1092 export mod_compress_cmd
1094 ifdef CONFIG_MODULE_SIG_ALL
1095 $(eval $(call config_filename,MODULE_SIG_KEY))
1097 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1103 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1105 has_libelf = $(call try-run,\
1106 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1108 ifdef CONFIG_STACK_VALIDATION
1109 ifeq ($(has_libelf),1)
1110 objtool_target := tools/objtool FORCE
1112 SKIP_STACK_VALIDATION := 1
1113 export SKIP_STACK_VALIDATION
1117 PHONY += resolve_btfids_clean
1119 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1121 # tools/bpf/resolve_btfids directory might not exist
1122 # in output directory, skip its clean in that case
1123 resolve_btfids_clean:
1124 ifneq ($(wildcard $(resolve_btfids_O)),)
1125 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1129 ifdef CONFIG_DEBUG_INFO_BTF
1130 ifeq ($(has_libelf),1)
1131 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1133 ERROR_RESOLVE_BTFIDS := 1
1135 endif # CONFIG_DEBUG_INFO_BTF
1140 export MODORDER := $(extmod-prefix)modules.order
1141 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1143 ifeq ($(KBUILD_EXTMOD),)
1144 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ io_uring/
1146 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1147 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1148 $(libs-y) $(libs-m)))
1150 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1151 $(patsubst %/,%,$(filter %/, $(core-) \
1152 $(drivers-) $(libs-))))
1154 build-dirs := $(vmlinux-dirs)
1155 clean-dirs := $(vmlinux-alldirs)
1157 subdir-modorder := $(addsuffix /modules.order, $(build-dirs))
1159 # Externally visible symbols (used by link-vmlinux.sh)
1160 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1161 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1162 ifdef CONFIG_MODULES
1163 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1164 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1166 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1168 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1170 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1171 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1172 # used by scripts/Makefile.package
1173 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1175 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1177 # Recurse until adjust_autoksyms.sh is satisfied
1178 PHONY += autoksyms_recursive
1179 ifdef CONFIG_TRIM_UNUSED_KSYMS
1180 # For the kernel to actually contain only the needed exported symbols,
1181 # we have to build modules as well to determine what those symbols are.
1182 # (this can be evaluated only once include/config/auto.conf has been included)
1185 autoksyms_recursive: descend modules.order
1186 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1187 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1190 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1192 quiet_cmd_autoksyms_h = GEN $@
1193 cmd_autoksyms_h = mkdir -p $(dir $@); \
1194 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1197 $(call cmd,autoksyms_h)
1199 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1201 # Final link of vmlinux with optional arch pass after final link
1202 cmd_link-vmlinux = \
1203 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1204 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1206 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1207 +$(call if_changed,link-vmlinux)
1211 # The actual objects are generated when descending,
1212 # make sure no implicit rule kicks in
1213 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1215 filechk_kernel.release = \
1216 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1218 # Store (new) KERNELRELEASE string in include/config/kernel.release
1219 include/config/kernel.release: FORCE
1220 $(call filechk,kernel.release)
1222 # Additional helpers built in scripts/
1223 # Carefully list dependencies so we do not try to build scripts twice
1226 scripts: scripts_basic scripts_dtc
1227 $(Q)$(MAKE) $(build)=$(@)
1229 # Things we need to do before we recursively start building the kernel
1230 # or the modules are listed in "prepare".
1231 # A multi level approach is used. prepareN is processed before prepareN-1.
1232 # archprepare is used in arch Makefiles and when processed asm symlink,
1233 # version.h and scripts_basic is processed / created.
1235 PHONY += prepare archprepare
1237 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1238 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1239 include/generated/autoconf.h
1241 prepare0: archprepare
1242 $(Q)$(MAKE) $(build)=scripts/mod
1243 $(Q)$(MAKE) $(build)=.
1245 # All the preparing..
1246 prepare: prepare0 prepare-objtool prepare-resolve_btfids
1248 # Support for using generic headers in asm-generic
1249 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1251 PHONY += asm-generic uapi-asm-generic
1252 asm-generic: uapi-asm-generic
1253 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1254 generic=include/asm-generic
1256 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1257 generic=include/uapi/asm-generic
1259 PHONY += prepare-objtool prepare-resolve_btfids
1260 prepare-objtool: $(objtool_target)
1261 ifeq ($(SKIP_STACK_VALIDATION),1)
1262 ifdef CONFIG_UNWINDER_ORC
1263 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1266 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1270 prepare-resolve_btfids: $(resolve_btfids_target)
1271 ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1272 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1275 # Generate some files
1276 # ---------------------------------------------------------------------------
1278 # KERNELRELEASE can change from a few different places, meaning version.h
1279 # needs to be updated, so this check is forced on all builds
1282 define filechk_utsrelease.h
1283 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1284 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1287 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1290 define filechk_version.h
1291 if [ $(SUBLEVEL) -gt 255 ]; then \
1292 echo \#define LINUX_VERSION_CODE $(shell \
1293 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1295 echo \#define LINUX_VERSION_CODE $(shell \
1296 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1298 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1299 ((c) > 255 ? 255 : (c)))'
1302 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1303 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1305 $(call filechk,version.h)
1306 $(Q)rm -f $(old_version_h)
1308 include/generated/utsrelease.h: include/config/kernel.release FORCE
1309 $(call filechk,utsrelease.h)
1313 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1314 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1316 # ---------------------------------------------------------------------------
1319 #Default location for installed headers
1320 export INSTALL_HDR_PATH = $(objtree)/usr
1322 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1323 cmd_headers_install = \
1324 mkdir -p $(INSTALL_HDR_PATH); \
1325 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1326 usr/include $(INSTALL_HDR_PATH)
1328 PHONY += headers_install
1329 headers_install: headers
1330 $(call cmd,headers_install)
1332 PHONY += archheaders archscripts
1334 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1337 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1338 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1339 $(error Headers not exportable for the $(SRCARCH) architecture))
1340 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1341 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1343 # Deprecated. It is no-op now.
1344 PHONY += headers_check
1348 ifdef CONFIG_HEADERS_INSTALL
1352 PHONY += scripts_unifdef
1353 scripts_unifdef: scripts_basic
1354 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1356 # ---------------------------------------------------------------------------
1361 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1364 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1366 PHONY += kselftest-merge
1368 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1369 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1370 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1371 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1373 # ---------------------------------------------------------------------------
1376 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1377 dtstree := arch/$(SRCARCH)/boot/dts
1382 %.dtb: include/config/kernel.release scripts_dtc
1383 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1385 PHONY += dtbs dtbs_install dtbs_check
1386 dtbs: include/config/kernel.release scripts_dtc
1387 $(Q)$(MAKE) $(build)=$(dtstree)
1389 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1391 dtbs: dt_binding_check
1397 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1399 ifdef CONFIG_OF_EARLY_FLATTREE
1405 PHONY += scripts_dtc
1406 scripts_dtc: scripts_basic
1407 $(Q)$(MAKE) $(build)=scripts/dtc
1409 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1410 export CHECK_DT_BINDING=y
1413 PHONY += dt_binding_check
1414 dt_binding_check: scripts_dtc
1415 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1417 # ---------------------------------------------------------------------------
1420 ifdef CONFIG_MODULES
1422 # By default, build modules as well
1426 # When we're building modules with modversions, we need to consider
1427 # the built-in objects during the descend as well, in order to
1428 # make sure the checksums are up to date before we record them.
1429 ifdef CONFIG_MODVERSIONS
1435 # A module can be listed more than once in obj-m resulting in
1436 # duplicate lines in modules.order files. Those are removed
1437 # using awk while concatenating to the final file.
1440 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1442 PHONY += modules_check
1443 modules_check: modules.order
1444 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1446 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1448 modules.order: $(subdir-modorder) FORCE
1449 $(call if_changed,modules_order)
1451 targets += modules.order
1453 # Target to prepare building external modules
1454 PHONY += modules_prepare
1455 modules_prepare: prepare
1456 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1458 modules_install: __modinst_pre
1459 PHONY += __modinst_pre
1461 @rm -rf $(MODLIB)/kernel
1462 @rm -f $(MODLIB)/source
1463 @mkdir -p $(MODLIB)/kernel
1464 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1465 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1466 rm -f $(MODLIB)/build ; \
1467 ln -s $(CURDIR) $(MODLIB)/build ; \
1469 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1470 @cp -f modules.builtin $(MODLIB)/
1471 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1473 ifeq ($(CONFIG_MODULE_SIG), y)
1474 PHONY += modules_sign
1476 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1479 endif # CONFIG_MODULES
1482 # Cleaning is done on three levels.
1483 # make clean Delete most generated files
1484 # Leave enough to build external modules
1485 # make mrproper Delete the current configuration, and all generated files
1486 # make distclean Remove editor backup files, patch leftover files and the like
1488 # Directories & files removed with 'make clean'
1489 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1490 modules.builtin modules.builtin.modinfo modules.nsdeps \
1491 compile_commands.json
1493 # Directories & files removed with 'make mrproper'
1494 MRPROPER_FILES += include/config include/generated \
1495 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1496 debian snap tar-install \
1497 .config .config.old .version \
1499 signing_key.pem signing_key.priv signing_key.x509 \
1500 x509.genkey extra_certificates signing_key.x509.keyid \
1501 signing_key.x509.signer vmlinux-gdb.py \
1504 # Directories & files removed with 'make distclean'
1505 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1507 # clean - Delete most, but leave enough to build external modules
1509 clean: rm-files := $(CLEAN_FILES)
1511 PHONY += archclean vmlinuxclean
1514 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1515 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1517 clean: archclean vmlinuxclean resolve_btfids_clean
1519 # mrproper - Delete all generated files, including .config
1521 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1522 mrproper-dirs := $(addprefix _mrproper_,scripts)
1524 PHONY += $(mrproper-dirs) mrproper
1526 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1528 mrproper: clean $(mrproper-dirs)
1533 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1539 @find $(srctree) $(RCS_FIND_IGNORE) \
1540 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1541 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1542 -o -name 'core' \) \
1543 -type f -print | xargs rm -f
1546 # Packaging of the kernel to various formats
1547 # ---------------------------------------------------------------------------
1550 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1551 %pkg: include/config/kernel.release FORCE
1552 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1554 # Brief documentation of the typical targets used
1555 # ---------------------------------------------------------------------------
1557 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1558 boards := $(sort $(notdir $(boards)))
1559 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1560 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1564 @echo 'Cleaning targets:'
1565 @echo ' clean - Remove most generated files but keep the config and'
1566 @echo ' enough build support to build external modules'
1567 @echo ' mrproper - Remove all generated files + config + various backup files'
1568 @echo ' distclean - mrproper + remove editor backup and patch files'
1570 @echo 'Configuration targets:'
1571 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1573 @echo 'Other generic targets:'
1574 @echo ' all - Build all targets marked with [*]'
1575 @echo '* vmlinux - Build the bare kernel'
1576 @echo '* modules - Build all modules'
1577 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1578 @echo ' dir/ - Build all files in dir and below'
1579 @echo ' dir/file.[ois] - Build specified target only'
1580 @echo ' dir/file.ll - Build the LLVM assembly file'
1581 @echo ' (requires compiler support for LLVM assembly generation)'
1582 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1583 @echo ' (requires a recent binutils and recent build (System.map))'
1584 @echo ' dir/file.ko - Build module including final link'
1585 @echo ' modules_prepare - Set up for building external modules'
1586 @echo ' tags/TAGS - Generate tags file for editors'
1587 @echo ' cscope - Generate cscope index'
1588 @echo ' gtags - Generate GNU GLOBAL index'
1589 @echo ' kernelrelease - Output the release version string (use with make -s)'
1590 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1591 @echo ' image_name - Output the image name (use with make -s)'
1592 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1593 echo ' (default: $(INSTALL_HDR_PATH))'; \
1595 @echo 'Static analysers:'
1596 @echo ' checkstack - Generate a list of stack hogs'
1597 @echo ' versioncheck - Sanity check on version.h usage'
1598 @echo ' includecheck - Check for duplicate included header files'
1599 @echo ' export_report - List the usages of all exported symbols'
1600 @echo ' headerdep - Detect inclusion cycles in headers'
1601 @echo ' coccicheck - Check with Coccinelle'
1602 @echo ' clang-analyzer - Check with clang static analyzer'
1603 @echo ' clang-tidy - Check with clang-tidy'
1606 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1608 @echo 'Kernel selftest:'
1609 @echo ' kselftest - Build and run kernel selftest'
1610 @echo ' Build, install, and boot kernel before'
1611 @echo ' running kselftest on it'
1612 @echo ' Run as root for full coverage'
1613 @echo ' kselftest-all - Build kernel selftest'
1614 @echo ' kselftest-install - Build and install kernel selftest'
1615 @echo ' kselftest-clean - Remove all generated kselftest files'
1616 @echo ' kselftest-merge - Merge all the config dependencies of'
1617 @echo ' kselftest to existing .config.'
1620 echo 'Devicetree:'; \
1621 echo '* dtbs - Build device tree blobs for enabled boards'; \
1622 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1623 echo ' dt_binding_check - Validate device tree binding documents'; \
1624 echo ' dtbs_check - Validate device tree source files';\
1627 @echo 'Userspace tools targets:'
1628 @echo ' use "make tools/help"'
1629 @echo ' or "cd tools; make help"'
1631 @echo 'Kernel packaging:'
1632 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1634 @echo 'Documentation targets:'
1635 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1637 @echo 'Architecture specific targets ($(SRCARCH)):'
1638 @$(if $(archhelp),$(archhelp),\
1639 echo ' No architecture specific help defined for $(SRCARCH)')
1642 $(foreach b, $(boards), \
1643 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1645 @$(if $(board-dirs), \
1646 $(foreach b, $(board-dirs), \
1647 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1648 printf " %-16s - Show all of the above\\n" help-boards; \
1651 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1652 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1653 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1654 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1655 @echo ' (sparse by default)'
1656 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1657 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1658 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1659 @echo ' 1: warnings which may be relevant and do not occur too often'
1660 @echo ' 2: warnings which occur quite often but may still be relevant'
1661 @echo ' 3: more obscure warnings, can most likely be ignored'
1662 @echo ' Multiple levels can be combined with W=12 or W=123'
1664 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1665 @echo 'For further info see the ./README file'
1668 help-board-dirs := $(addprefix help-,$(board-dirs))
1670 help-boards: $(help-board-dirs)
1672 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1674 $(help-board-dirs): help-%:
1675 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1676 @$(if $(boards-per-dir), \
1677 $(foreach b, $(boards-per-dir), \
1678 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1682 # Documentation targets
1683 # ---------------------------------------------------------------------------
1684 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1685 linkcheckdocs dochelp refcheckdocs
1686 PHONY += $(DOC_TARGETS)
1688 $(Q)$(MAKE) $(build)=Documentation $@
1691 # ---------------------------------------------------------------------------
1693 PHONY += scripts_gdb
1694 scripts_gdb: prepare0
1695 $(Q)$(MAKE) $(build)=scripts/gdb
1696 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1698 ifdef CONFIG_GDB_SCRIPTS
1702 else # KBUILD_EXTMOD
1705 # External module support.
1706 # When building external modules the kernel used as basis is considered
1707 # read-only, and no consistency checks are made and the make
1708 # system is not used on the basis kernel. If updates are required
1709 # in the basis kernel ordinary make commands (without M=...) must
1712 # The following are the only valid targets when building external
1714 # make M=dir clean Delete all automatically generated files
1715 # make M=dir modules Make all modules in specified dir
1716 # make M=dir Same as 'make M=dir modules'
1717 # make M=dir modules_install
1718 # Install the modules built in the module directory
1719 # Assumes install directory is already created
1721 # We are always building only modules.
1725 build-dirs := $(KBUILD_EXTMOD)
1726 $(MODORDER): descend
1729 compile_commands.json: $(extmod-prefix)compile_commands.json
1730 PHONY += compile_commands.json
1732 clean-dirs := $(KBUILD_EXTMOD)
1733 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1734 $(KBUILD_EXTMOD)/compile_commands.json
1738 @echo ' Building external modules.'
1739 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1741 @echo ' modules - default target, build the module(s)'
1742 @echo ' modules_install - install the module'
1743 @echo ' clean - remove generated files in module directory only'
1746 # no-op for external module builds
1747 PHONY += prepare modules_prepare
1749 endif # KBUILD_EXTMOD
1751 # ---------------------------------------------------------------------------
1754 PHONY += modules modules_install
1756 ifdef CONFIG_MODULES
1758 modules: $(MODORDER)
1759 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1761 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1762 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1766 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1769 else # CONFIG_MODULES
1771 # Modules not configured
1772 # ---------------------------------------------------------------------------
1774 modules modules_install:
1776 @echo >&2 '*** The present kernel configuration has modules disabled.'
1777 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1778 @echo >&2 '*** to enable CONFIG_MODULES.'
1784 endif # CONFIG_MODULES
1787 # ---------------------------------------------------------------------------
1788 # To build individual files in subdirectories, you can do like this:
1790 # make foo/bar/baz.s
1792 # The supported suffixes for single-target are listed in 'single-targets'
1794 # To build only under specific subdirectories, you can do like this:
1800 # .ko is special because modpost is needed
1801 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1802 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1804 $(single-ko): single_modpost
1806 $(single-no-ko): descend
1809 # Remove MODORDER when done because it is not the real one.
1810 PHONY += single_modpost
1811 single_modpost: $(single-no-ko) modules_prepare
1812 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1813 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1814 $(Q)rm -f $(MODORDER)
1816 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1818 # trim unrelated directories
1819 build-dirs := $(foreach d, $(build-dirs), \
1820 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1824 # Handle descending into subdirectories listed in $(build-dirs)
1825 # Preset locale variables to speed up the build process. Limit locale
1826 # tweaks to this spot to avoid wrong language settings when running
1827 # make menuconfig etc.
1828 # Error messages still appears in the original language
1829 PHONY += descend $(build-dirs)
1830 descend: $(build-dirs)
1831 $(build-dirs): prepare
1832 $(Q)$(MAKE) $(build)=$@ \
1833 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1834 need-builtin=1 need-modorder=1
1836 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1837 PHONY += $(clean-dirs) clean
1839 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1841 clean: $(clean-dirs)
1843 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1844 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1846 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1847 -o -name '*.dwo' -o -name '*.lst' \
1848 -o -name '*.su' -o -name '*.mod' \
1849 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1850 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1851 -o -name '*.asn1.[ch]' \
1852 -o -name '*.symtypes' -o -name 'modules.order' \
1853 -o -name '.tmp_*.o.*' \
1854 -o -name '*.c.[012]*.*' \
1856 -o -name '*.gcno' \) -type f -print | xargs rm -f
1858 # Generate tags for editors
1859 # ---------------------------------------------------------------------------
1860 quiet_cmd_tags = GEN $@
1861 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1863 tags TAGS cscope gtags: FORCE
1866 # Script to generate missing namespace dependencies
1867 # ---------------------------------------------------------------------------
1870 nsdeps: export KBUILD_NSDEPS=1
1872 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1875 # ---------------------------------------------------------------------------
1877 quiet_cmd_gen_compile_commands = GEN $@
1878 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1880 $(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1881 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1882 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1883 $(call if_changed,gen_compile_commands)
1885 targets += $(extmod-prefix)compile_commands.json
1887 PHONY += clang-tidy clang-analyzer
1889 ifdef CONFIG_CC_IS_CLANG
1890 quiet_cmd_clang_tools = CHECK $<
1891 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1893 clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
1894 $(call cmd,clang_tools)
1896 clang-tidy clang-analyzer:
1897 @echo "$@ requires CC=clang" >&2
1901 # Scripts to check various things for consistency
1902 # ---------------------------------------------------------------------------
1904 PHONY += includecheck versioncheck coccicheck export_report
1907 find $(srctree)/* $(RCS_FIND_IGNORE) \
1908 -name '*.[hcS]' -type f -print | sort \
1909 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1912 find $(srctree)/* $(RCS_FIND_IGNORE) \
1913 -name '*.[hcS]' -type f -print | sort \
1914 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1917 $(Q)$(BASH) $(srctree)/scripts/$@
1920 $(PERL) $(srctree)/scripts/export_report.pl
1922 PHONY += checkstack kernelrelease kernelversion image_name
1924 # UML needs a little special treatment here. It wants to use the host
1925 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1926 # else wants $(ARCH), including people doing cross-builds, which means
1927 # that $(SUBARCH) doesn't work here.
1929 CHECKSTACK_ARCH := $(SUBARCH)
1931 CHECKSTACK_ARCH := $(ARCH)
1934 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1935 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1938 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1941 @echo $(KERNELVERSION)
1944 @echo $(KBUILD_IMAGE)
1946 # Clear a bunch of variables before executing the submake
1948 ifeq ($(quiet),silent_)
1953 $(Q)mkdir -p $(objtree)/tools
1954 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1957 $(Q)mkdir -p $(objtree)/tools
1958 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1960 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1961 cmd_rmfiles = rm -rf $(rm-files)
1963 # read saved command lines for existing targets
1964 existing-targets := $(wildcard $(sort $(targets)))
1966 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1968 endif # config-build
1970 endif # need-sub-make
1975 # Declare the contents of the PHONY variable as phony. We keep that
1976 # information in a variable so we can use it in if_changed and friends.