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 $(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 ($(KBUILD_VERBOSE),1)
94 # If the user is running make -s (silent mode), suppress echoing of
97 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
102 export quiet Q KBUILD_VERBOSE
104 # Call a source code checker (by default, "sparse") as part of the
107 # Use 'make C=1' to enable checking of only re-compiled files.
108 # Use 'make C=2' to enable checking of *all* source files, regardless
109 # of whether they are re-compiled or not.
111 # See the file "Documentation/dev-tools/sparse.rst" for more details,
112 # including where to get the "sparse" utility.
114 ifeq ("$(origin C)", "command line")
115 KBUILD_CHECKSRC = $(C)
117 ifndef KBUILD_CHECKSRC
121 export KBUILD_CHECKSRC
123 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
124 # directory of external module to build. Setting M= takes precedence.
125 ifeq ("$(origin M)", "command line")
126 KBUILD_EXTMOD := $(M)
129 $(if $(word 2, $(KBUILD_EXTMOD)), \
130 $(error building multiple external modules is not supported))
132 # Remove trailing slashes
133 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
134 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
139 # Kbuild will save output files in the current working directory.
140 # This does not need to match to the root of the kernel source tree.
142 # For example, you can do this:
144 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
146 # If you want to save output files in a different location, there are
147 # two syntaxes to specify it.
150 # Use "make O=dir/to/store/output/files/"
152 # 2) Set KBUILD_OUTPUT
153 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
154 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
156 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
159 # Do we want to change the working directory?
160 ifeq ("$(origin O)", "command line")
161 KBUILD_OUTPUT := $(O)
164 ifneq ($(KBUILD_OUTPUT),)
165 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
166 # expand a shell special character '~'. We use a somewhat tedious way here.
167 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
168 $(if $(abs_objtree),, \
169 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
171 # $(realpath ...) resolves symlinks
172 abs_objtree := $(realpath $(abs_objtree))
174 abs_objtree := $(CURDIR)
175 endif # ifneq ($(KBUILD_OUTPUT),)
177 ifeq ($(abs_objtree),$(CURDIR))
178 # Suppress "Entering directory ..." unless we are changing the work directory.
179 MAKEFLAGS += --no-print-directory
184 this-makefile := $(lastword $(MAKEFILE_LIST))
185 abs_srctree := $(realpath $(dir $(this-makefile)))
187 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
188 $(error source directory cannot contain spaces or colons)
191 ifneq ($(abs_srctree),$(abs_objtree))
192 # Look for make include files relative to root of kernel src
194 # --included-dir is added for backward compatibility, but you should not rely on
195 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
196 MAKEFLAGS += --include-dir=$(abs_srctree)
199 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
200 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
201 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
203 # Cancel implicit rules for this Makefile.
207 export abs_srctree abs_objtree
208 export sub_make_done := 1
210 ifeq ($(need-sub-make),1)
212 PHONY += $(MAKECMDGOALS) __sub-make
214 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
217 # Invoke a second make in the output directory, passing relevant variables
219 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
221 endif # need-sub-make
222 endif # sub_make_done
224 # We process the rest of the Makefile if this is the final invocation of make
225 ifeq ($(need-sub-make),)
227 # Do not print "Entering directory ...",
228 # but we want to display it when entering to the output directory
229 # so that IDEs/editors are able to understand relative filenames.
230 MAKEFLAGS += --no-print-directory
232 ifeq ($(abs_srctree),$(abs_objtree))
233 # building in the source tree
235 building_out_of_srctree :=
237 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
238 # building in a subdirectory of the source tree
241 srctree := $(abs_srctree)
243 building_out_of_srctree := 1
246 ifneq ($(KBUILD_ABS_SRCTREE),)
247 srctree := $(abs_srctree)
253 export building_out_of_srctree srctree objtree VPATH
255 # To make sure we do not include .config for any of the *config targets
256 # catch them early, and hand them over to scripts/kconfig/Makefile
257 # It is allowed to specify more targets when calling make, including
258 # mixing *config targets and build targets.
259 # For example 'make oldconfig all'.
260 # Detect when mixed targets is specified, and make a second invocation
261 # of make so .config is not included in this case either (for *config).
263 version_h := include/generated/uapi/linux/version.h
265 clean-targets := %clean mrproper cleandocs
266 no-dot-config-targets := $(clean-targets) \
267 cscope gtags TAGS tags help% %docs check% coccicheck \
268 $(version_h) headers headers_% archheaders archscripts \
269 %asm-generic kernelversion %src-pkg dt_binding_check \
271 # Installation targets should not require compiler. Unfortunately, vdso_install
272 # is an exception where build artifacts may be updated. This must be fixed.
273 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
274 headers_install modules_install kernelrelease image_name
275 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
277 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
286 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
287 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
292 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
293 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
298 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
299 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
304 ifneq ($(KBUILD_EXTMOD),)
308 ifeq ($(KBUILD_EXTMOD),)
309 ifneq ($(filter %config,$(MAKECMDGOALS)),)
311 ifneq ($(words $(MAKECMDGOALS)),1)
317 # We cannot build single targets and the others at the same time
318 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
320 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
325 # For "make -j clean all", "make -j mrproper defconfig all", etc.
326 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
327 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
332 # install and modules_install need also be processed one by one
333 ifneq ($(filter install,$(MAKECMDGOALS)),)
334 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
340 # ===========================================================================
341 # We're called with mixed targets (*config and build targets).
342 # Handle them one by one.
344 PHONY += $(MAKECMDGOALS) __build_one_by_one
346 $(MAKECMDGOALS): __build_one_by_one
351 for i in $(MAKECMDGOALS); do \
352 $(MAKE) -f $(srctree)/Makefile $$i; \
357 include $(srctree)/scripts/Kbuild.include
359 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
360 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
361 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
362 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
364 include $(srctree)/scripts/subarch.include
366 # Cross compiling and selecting different set of gcc/bin-utils
367 # ---------------------------------------------------------------------------
369 # When performing cross compilation for other architectures ARCH shall be set
370 # to the target architecture. (See arch/* for the possibilities).
371 # ARCH can be set during invocation of make:
373 # Another way is to have ARCH set in the environment.
374 # The default ARCH is the host where make is executed.
376 # CROSS_COMPILE specify the prefix used for all executables used
377 # during compilation. Only gcc and related bin-utils executables
378 # are prefixed with $(CROSS_COMPILE).
379 # CROSS_COMPILE can be set on the command line
380 # make CROSS_COMPILE=ia64-linux-
381 # Alternatively CROSS_COMPILE can be set in the environment.
382 # Default value for CROSS_COMPILE is not to prefix executables
383 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
386 # Architecture as present in compile.h
387 UTS_MACHINE := $(ARCH)
390 # Additional ARCH settings for x86
394 ifeq ($(ARCH),x86_64)
398 # Additional ARCH settings for sparc
399 ifeq ($(ARCH),sparc32)
402 ifeq ($(ARCH),sparc64)
406 # Additional ARCH settings for parisc
407 ifeq ($(ARCH),parisc64)
411 export cross_compiling :=
412 ifneq ($(SRCARCH),$(SUBARCH))
416 KCONFIG_CONFIG ?= .config
417 export KCONFIG_CONFIG
419 # SHELL used by kbuild
422 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
423 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
424 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
434 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
435 -O2 -fomit-frame-pointer -std=gnu89
436 export KBUILD_USERLDFLAGS :=
438 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
439 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
440 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
441 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
443 # Make variables (CC, etc...)
450 OBJCOPY = llvm-objcopy
451 OBJDUMP = llvm-objdump
452 READELF = llvm-readelf
455 CC = $(CROSS_COMPILE)gcc
456 LD = $(CROSS_COMPILE)ld
457 AR = $(CROSS_COMPILE)ar
458 NM = $(CROSS_COMPILE)nm
459 OBJCOPY = $(CROSS_COMPILE)objcopy
460 OBJDUMP = $(CROSS_COMPILE)objdump
461 READELF = $(CROSS_COMPILE)readelf
462 STRIP = $(CROSS_COMPILE)strip
465 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
469 INSTALLKERNEL := installkernel
483 PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
485 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
486 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
495 # Use USERINCLUDE when you must reference the UAPI directories only.
497 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
498 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
499 -I$(srctree)/include/uapi \
500 -I$(objtree)/include/generated/uapi \
501 -include $(srctree)/include/linux/compiler-version.h \
502 -include $(srctree)/include/linux/kconfig.h
504 # Use LINUXINCLUDE when you must reference the include/ directory.
505 # Needed to be compatible with the O= option
507 -I$(srctree)/arch/$(SRCARCH)/include \
508 -I$(objtree)/arch/$(SRCARCH)/include/generated \
509 $(if $(building_out_of_srctree),-I$(srctree)/include) \
510 -I$(objtree)/include \
513 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
514 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
515 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
516 -Werror=implicit-function-declaration -Werror=implicit-int \
517 -Werror=return-type -Wno-format-security \
519 KBUILD_CPPFLAGS := -D__KERNEL__
520 KBUILD_AFLAGS_KERNEL :=
521 KBUILD_CFLAGS_KERNEL :=
522 KBUILD_AFLAGS_MODULE := -DMODULE
523 KBUILD_CFLAGS_MODULE := -DMODULE
524 KBUILD_LDFLAGS_MODULE :=
528 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
529 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
530 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
531 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
532 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
534 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
535 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
536 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
537 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
538 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
541 # Files to ignore in find ... statements
543 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
544 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
546 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
547 --exclude CVS --exclude .pc --exclude .hg --exclude .git
549 # ===========================================================================
550 # Rules shared between *config targets and build targets
552 # Basic helpers built in scripts/basic/
553 PHONY += scripts_basic
555 $(Q)$(MAKE) $(build)=scripts/basic
557 PHONY += outputmakefile
558 ifdef building_out_of_srctree
559 # Before starting out-of-tree build, make sure the source tree is clean.
560 # outputmakefile generates a Makefile in the output directory, if using a
561 # separate output directory. This allows convenient use of make in the
563 # At the same time when output Makefile generated, generate .gitignore to
564 # ignore whole output directory
566 quiet_cmd_makefile = GEN Makefile
568 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
569 echo "include $(srctree)/Makefile"; \
573 $(Q)if [ -f $(srctree)/.config -o \
574 -d $(srctree)/include/config -o \
575 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
577 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
578 echo >&2 "*** in $(abs_srctree)";\
582 $(Q)ln -fsn $(srctree) source
584 $(Q)test -e .gitignore || \
585 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
588 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
589 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
590 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
591 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
592 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
594 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
595 include $(srctree)/scripts/Makefile.clang
598 # Include this also for config targets because some architectures need
599 # cc-cross-prefix to determine CROSS_COMPILE.
601 include $(srctree)/scripts/Makefile.compiler
605 # ===========================================================================
606 # *config targets only - make sure prerequisites are updated, and descend
607 # in scripts/kconfig to make the *config target
609 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
610 # KBUILD_DEFCONFIG may point out an alternative default configuration
611 # used for 'make defconfig'
612 include $(srctree)/arch/$(SRCARCH)/Makefile
613 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
615 config: outputmakefile scripts_basic FORCE
616 $(Q)$(MAKE) $(build)=scripts/kconfig $@
618 %config: outputmakefile scripts_basic FORCE
619 $(Q)$(MAKE) $(build)=scripts/kconfig $@
622 # ===========================================================================
623 # Build targets only - this includes vmlinux, arch specific targets, clean
624 # targets and others. In general all targets except *config targets.
626 # If building an external module we do not care about the all: rule
627 # but instead __all depend on modules
629 ifeq ($(KBUILD_EXTMOD),)
635 # Decide whether to build built-in, modular, or both.
636 # Normally, just do built-in.
641 # If we have only "make modules", don't compile built-in objects.
642 ifeq ($(MAKECMDGOALS),modules)
646 # If we have "make <whatever> modules", compile modules
647 # in addition to whatever we do anyway.
648 # Just "make" or "make all" shall build modules as well
650 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
654 ifeq ($(MAKECMDGOALS),)
658 export KBUILD_MODULES KBUILD_BUILTIN
661 include include/config/auto.conf
664 ifeq ($(KBUILD_EXTMOD),)
665 # Objects we will link into vmlinux / subdirs we need to visit
666 core-y := init/ usr/ arch/$(SRCARCH)/
667 drivers-y := drivers/ sound/
668 drivers-$(CONFIG_SAMPLES) += samples/
669 drivers-$(CONFIG_NET) += net/
672 endif # KBUILD_EXTMOD
674 # The all: target is the default when no target is given on the
676 # This allow a user to issue only 'make' to build a kernel including modules
677 # Defaults to vmlinux, but the arch makefile usually adds further targets
680 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
681 ifdef CONFIG_CC_IS_GCC
682 CFLAGS_GCOV += -fno-tree-loop-im
686 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
687 ifdef CONFIG_FUNCTION_TRACER
688 CC_FLAGS_FTRACE := -pg
691 ifdef CONFIG_CC_IS_GCC
692 RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
693 RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register)
695 ifdef CONFIG_CC_IS_CLANG
696 RETPOLINE_CFLAGS := -mretpoline-external-thunk
697 RETPOLINE_VDSO_CFLAGS := -mretpoline
699 export RETPOLINE_CFLAGS
700 export RETPOLINE_VDSO_CFLAGS
702 include $(srctree)/arch/$(SRCARCH)/Makefile
705 ifdef may-sync-config
706 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
707 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
708 # because some architectures define CROSS_COMPILE there.
709 include include/config/auto.conf.cmd
713 @echo >&2 '*** Configuration file "$@" not found!'
715 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
716 @echo >&2 '*** "make menuconfig" or "make xconfig").'
720 # The actual configuration files used during the build are stored in
721 # include/generated/ and include/config/. Update them if .config is newer than
722 # include/config/auto.conf (which mirrors .config).
724 # This exploits the 'multi-target pattern rule' trick.
725 # The syncconfig should be executed only once to make all the targets.
726 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
728 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
729 # so you cannot notice that Kconfig is waiting for the user input.
730 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
731 $(Q)$(kecho) " SYNC $@"
732 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
733 else # !may-sync-config
734 # External modules and some install targets need include/generated/autoconf.h
735 # and include/config/auto.conf but do not care if they are up-to-date.
736 # Use auto.conf to trigger the test
737 PHONY += include/config/auto.conf
739 include/config/auto.conf:
740 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
742 echo >&2 " ERROR: Kernel configuration is invalid."; \
743 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
744 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
748 endif # may-sync-config
751 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
752 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
753 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
754 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
755 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
757 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
759 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
761 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
765 # Tell gcc to never replace conditional load with a non-conditional one
766 ifdef CONFIG_CC_IS_GCC
767 # gcc-10 renamed --param=allow-store-data-races=0 to
768 # -fno-allow-store-data-races.
769 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
770 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
773 ifdef CONFIG_READABLE_ASM
774 # Disable optimizations that make assembler listings hard to read.
775 # reorder blocks reorders the control in the function
776 # ipa clone creates specialized cloned functions
777 # partial inlining inlines only parts of functions
778 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
781 ifneq ($(CONFIG_FRAME_WARN),0)
782 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
785 stackp-flags-y := -fno-stack-protector
786 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
787 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
789 KBUILD_CFLAGS += $(stackp-flags-y)
791 KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror
792 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y)
794 ifdef CONFIG_CC_IS_CLANG
795 KBUILD_CPPFLAGS += -Qunused-arguments
796 # The kernel builds with '-std=gnu89' so use of GNU extensions is acceptable.
797 KBUILD_CFLAGS += -Wno-gnu
798 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
799 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
800 # See modpost pattern 2
801 KBUILD_CFLAGS += -mno-global-merge
804 # Warn about unmarked fall-throughs in switch statement.
805 # Disabled for clang while comment to attribute conversion happens and
806 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
807 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=5,)
808 # gcc inanely warns about local variables called 'main'
809 KBUILD_CFLAGS += -Wno-main
812 # These warnings generated too much noise in a regular build.
813 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
814 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
815 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
817 ifdef CONFIG_FRAME_POINTER
818 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
820 # Some targets (ARM with Thumb2, for example), can't be built with frame
821 # pointers. For those, we don't have FUNCTION_TRACER automatically
822 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
823 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
824 # -fomit-frame-pointer with FUNCTION_TRACER.
825 ifndef CONFIG_FUNCTION_TRACER
826 KBUILD_CFLAGS += -fomit-frame-pointer
830 # Initialize all stack variables with a 0xAA pattern.
831 ifdef CONFIG_INIT_STACK_ALL_PATTERN
832 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
835 # Initialize all stack variables with a zero value.
836 ifdef CONFIG_INIT_STACK_ALL_ZERO
837 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
838 ifdef CONFIG_CC_IS_CLANG
839 # https://bugs.llvm.org/show_bug.cgi?id=45497
840 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
844 # While VLAs have been removed, GCC produces unreachable stack probes
845 # for the randomize_kstack_offset feature. Disable it for all compilers.
846 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
848 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
849 ifdef CONFIG_ZERO_CALL_USED_REGS
850 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
853 ifdef CONFIG_FUNCTION_TRACER
854 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
855 CC_FLAGS_FTRACE += -mrecord-mcount
856 ifdef CONFIG_HAVE_NOP_MCOUNT
857 ifeq ($(call cc-option-yn, -mnop-mcount),y)
858 CC_FLAGS_FTRACE += -mnop-mcount
859 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
863 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
864 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
866 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
867 ifdef CONFIG_HAVE_C_RECORDMCOUNT
868 BUILD_C_RECORDMCOUNT := y
869 export BUILD_C_RECORDMCOUNT
872 ifdef CONFIG_HAVE_FENTRY
873 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
874 ifeq ($(call cc-option-yn, -mfentry),y)
875 CC_FLAGS_FTRACE += -mfentry
876 CC_FLAGS_USING += -DCC_USING_FENTRY
879 export CC_FLAGS_FTRACE
880 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
881 KBUILD_AFLAGS += $(CC_FLAGS_USING)
884 # We trigger additional mismatches with less inlining
885 ifdef CONFIG_DEBUG_SECTION_MISMATCH
886 KBUILD_CFLAGS += -fno-inline-functions-called-once
889 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
890 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
891 LDFLAGS_vmlinux += --gc-sections
894 ifdef CONFIG_SHADOW_CALL_STACK
895 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
896 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
900 ifdef CONFIG_LTO_CLANG
901 ifdef CONFIG_LTO_CLANG_THIN
902 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
903 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
905 CC_FLAGS_LTO := -flto
907 CC_FLAGS_LTO += -fvisibility=hidden
909 # Limit inlining across translation units to reduce binary size
910 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
912 # Check for frame size exceeding threshold during prolog/epilog insertion
913 # when using lld < 13.0.0.
914 ifneq ($(CONFIG_FRAME_WARN),0)
915 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
916 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
922 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
923 KBUILD_AFLAGS += -fno-lto
927 ifdef CONFIG_CFI_CLANG
928 CC_FLAGS_CFI := -fsanitize=cfi \
929 -fsanitize-cfi-cross-dso \
930 -fno-sanitize-cfi-canonical-jump-tables \
931 -fno-sanitize-trap=cfi \
932 -fno-sanitize-blacklist
934 ifdef CONFIG_CFI_PERMISSIVE
935 CC_FLAGS_CFI += -fsanitize-recover=cfi
938 # If LTO flags are filtered out, we must also filter out CFI.
939 CC_FLAGS_LTO += $(CC_FLAGS_CFI)
940 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
944 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
945 KBUILD_CFLAGS += -falign-functions=64
948 # arch Makefile may override CC so keep this after arch Makefile is included
949 NOSTDINC_FLAGS += -nostdinc
951 # warn about C99 declaration after statement
952 KBUILD_CFLAGS += -Wdeclaration-after-statement
954 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
955 KBUILD_CFLAGS += -Wvla
957 # disable pointer signed / unsigned warnings in gcc 4.0
958 KBUILD_CFLAGS += -Wno-pointer-sign
960 # disable stringop warnings in gcc 8+
961 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
963 # We'll want to enable this eventually, but it's not going away for 5.7 at least
964 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
965 KBUILD_CFLAGS += -Wno-array-bounds
966 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
968 # Another good warning that we'll want to enable eventually
969 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
971 # Enabled with W=2, disabled by default as noisy
972 ifdef CONFIG_CC_IS_GCC
973 KBUILD_CFLAGS += -Wno-maybe-uninitialized
976 ifdef CONFIG_CC_IS_GCC
977 # The allocators already balk at large sizes, so silence the compiler
978 # warnings for bounds checks involving those possible values. While
979 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
980 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
981 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
982 # doesn't work (as it is documented to), silently resolving to "0" prior to
983 # version 9.1 (and producing an error more recently). Numeric values larger
984 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
985 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
986 # choice, we must perform a versioned check to disable this warning.
987 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
988 KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than)
991 # disable invalid "can't wrap" optimizations for signed / pointers
992 KBUILD_CFLAGS += -fno-strict-overflow
994 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
995 KBUILD_CFLAGS += -fno-stack-check
997 # conserve stack if available
998 ifdef CONFIG_CC_IS_GCC
999 KBUILD_CFLAGS += -fconserve-stack
1002 # Prohibit date/time macros, which would make the build non-deterministic
1003 KBUILD_CFLAGS += -Werror=date-time
1005 # enforce correct pointer usage
1006 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
1008 # Require designated initializers for all marked structures
1009 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1011 # change __FILE__ to the relative path from the srctree
1012 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1014 # include additional Makefiles when needed
1015 include-y := scripts/Makefile.extrawarn
1016 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1017 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1018 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1019 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1020 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1021 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1023 include $(addprefix $(srctree)/, $(include-y))
1025 # scripts/Makefile.gcc-plugins is intentionally included last.
1026 # Do not add $(call cc-option,...) below this line. When you build the kernel
1027 # from the clean source tree, the GCC plugins do not exist at this point.
1029 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1030 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1031 KBUILD_AFLAGS += $(KAFLAGS)
1032 KBUILD_CFLAGS += $(KCFLAGS)
1034 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1035 LDFLAGS_vmlinux += --build-id=sha1
1037 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1038 LDFLAGS_vmlinux += $(call ld-option, -X,)
1041 ifeq ($(CONFIG_RELR),y)
1042 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1045 # We never want expected sections to be placed heuristically by the
1046 # linker. All sections should be explicitly named in the linker script.
1047 ifdef CONFIG_LD_ORPHAN_WARN
1048 LDFLAGS_vmlinux += --orphan-handling=warn
1051 # Align the bit size of userspace programs with the kernel
1052 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1053 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1055 # make the checker run with the right architecture
1056 CHECKFLAGS += --arch=$(ARCH)
1058 # insure the checker run with the right endianness
1059 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1061 # the checker needs the correct machine size
1062 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1064 # Default kernel image to build when no specific target is given.
1065 # KBUILD_IMAGE may be overruled on the command line or
1066 # set in the environment
1067 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1068 # this default value
1069 export KBUILD_IMAGE ?= vmlinux
1072 # INSTALL_PATH specifies where to place the updated kernel and system map
1073 # images. Default is /boot, but you can set it to other values
1074 export INSTALL_PATH ?= /boot
1077 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1078 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1079 # an argument if needed. Otherwise it defaults to the kernel install path
1081 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1084 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1085 # relocations required by build roots. This is not defined in the
1086 # makefile but the argument can be passed to make if needed.
1089 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1094 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1095 export MODORDER := $(extmod_prefix)modules.order
1096 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1098 ifeq ($(KBUILD_EXTMOD),)
1099 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/
1100 core-$(CONFIG_BLOCK) += block/
1102 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1103 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1104 $(libs-y) $(libs-m)))
1106 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1107 $(patsubst %/,%,$(filter %/, $(core-) \
1108 $(drivers-) $(libs-))))
1110 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1111 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1112 $(drivers-y) $(drivers-m)))
1114 build-dirs := $(vmlinux-dirs)
1115 clean-dirs := $(vmlinux-alldirs)
1117 # Externally visible symbols (used by link-vmlinux.sh)
1118 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1119 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1120 ifdef CONFIG_MODULES
1121 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1122 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1124 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1126 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1128 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1129 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1130 # used by scripts/Makefile.package
1131 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1133 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1135 # Recurse until adjust_autoksyms.sh is satisfied
1136 PHONY += autoksyms_recursive
1137 ifdef CONFIG_TRIM_UNUSED_KSYMS
1138 # For the kernel to actually contain only the needed exported symbols,
1139 # we have to build modules as well to determine what those symbols are.
1140 # (this can be evaluated only once include/config/auto.conf has been included)
1143 autoksyms_recursive: descend modules.order
1144 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1145 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1148 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1150 quiet_cmd_autoksyms_h = GEN $@
1151 cmd_autoksyms_h = mkdir -p $(dir $@); \
1152 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1155 $(call cmd,autoksyms_h)
1157 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1159 # Final link of vmlinux with optional arch pass after final link
1160 cmd_link-vmlinux = \
1161 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1162 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1164 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1165 +$(call if_changed_dep,link-vmlinux)
1169 # The actual objects are generated when descending,
1170 # make sure no implicit rule kicks in
1171 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1173 filechk_kernel.release = \
1174 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1176 # Store (new) KERNELRELEASE string in include/config/kernel.release
1177 include/config/kernel.release: FORCE
1178 $(call filechk,kernel.release)
1180 # Additional helpers built in scripts/
1181 # Carefully list dependencies so we do not try to build scripts twice
1184 scripts: scripts_basic scripts_dtc
1185 $(Q)$(MAKE) $(build)=$(@)
1187 # Things we need to do before we recursively start building the kernel
1188 # or the modules are listed in "prepare".
1189 # A multi level approach is used. prepareN is processed before prepareN-1.
1190 # archprepare is used in arch Makefiles and when processed asm symlink,
1191 # version.h and scripts_basic is processed / created.
1193 PHONY += prepare archprepare
1195 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1196 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1197 include/generated/autoconf.h remove-stale-files
1199 prepare0: archprepare
1200 $(Q)$(MAKE) $(build)=scripts/mod
1201 $(Q)$(MAKE) $(build)=.
1203 # All the preparing..
1206 PHONY += remove-stale-files
1208 $(Q)$(srctree)/scripts/remove-stale-files
1210 # Support for using generic headers in asm-generic
1211 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1213 PHONY += asm-generic uapi-asm-generic
1214 asm-generic: uapi-asm-generic
1215 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1216 generic=include/asm-generic
1218 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1219 generic=include/uapi/asm-generic
1221 # Generate some files
1222 # ---------------------------------------------------------------------------
1224 # KERNELRELEASE can change from a few different places, meaning version.h
1225 # needs to be updated, so this check is forced on all builds
1228 define filechk_utsrelease.h
1229 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1230 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1233 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1236 define filechk_version.h
1237 if [ $(SUBLEVEL) -gt 255 ]; then \
1238 echo \#define LINUX_VERSION_CODE $(shell \
1239 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1241 echo \#define LINUX_VERSION_CODE $(shell \
1242 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1244 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1245 ((c) > 255 ? 255 : (c)))'; \
1246 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1247 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1248 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1251 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1252 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1254 $(call filechk,version.h)
1256 include/generated/utsrelease.h: include/config/kernel.release FORCE
1257 $(call filechk,utsrelease.h)
1261 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1262 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1264 # ---------------------------------------------------------------------------
1267 #Default location for installed headers
1268 export INSTALL_HDR_PATH = $(objtree)/usr
1270 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1271 cmd_headers_install = \
1272 mkdir -p $(INSTALL_HDR_PATH); \
1273 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1274 usr/include $(INSTALL_HDR_PATH)
1276 PHONY += headers_install
1277 headers_install: headers
1278 $(call cmd,headers_install)
1280 PHONY += archheaders archscripts
1282 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1285 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1286 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1287 $(error Headers not exportable for the $(SRCARCH) architecture))
1288 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1289 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1291 # Deprecated. It is no-op now.
1292 PHONY += headers_check
1294 @echo >&2 "=================== WARNING ==================="
1295 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op,"
1296 @echo >&2 "and will be removed after Linux 5.15 release."
1297 @echo >&2 "Please remove headers_check from your scripts."
1298 @echo >&2 "==============================================="
1300 ifdef CONFIG_HEADERS_INSTALL
1304 PHONY += scripts_unifdef
1305 scripts_unifdef: scripts_basic
1306 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1308 # ---------------------------------------------------------------------------
1311 # Many distributions have the custom install script, /sbin/installkernel.
1312 # If DKMS is installed, 'make install' will eventually recuses back
1313 # to the this Makefile to build and install external modules.
1314 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1316 install: sub_make_done :=
1318 # ---------------------------------------------------------------------------
1321 ifdef CONFIG_STACK_VALIDATION
1322 prepare: tools/objtool
1326 ifdef CONFIG_DEBUG_INFO_BTF
1327 prepare: tools/bpf/resolve_btfids
1331 PHONY += resolve_btfids_clean
1333 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1335 # tools/bpf/resolve_btfids directory might not exist
1336 # in output directory, skip its clean in that case
1337 resolve_btfids_clean:
1338 ifneq ($(wildcard $(resolve_btfids_O)),)
1339 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1342 # Clear a bunch of variables before executing the submake
1343 ifeq ($(quiet),silent_)
1348 $(Q)mkdir -p $(objtree)/tools
1349 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1352 $(Q)mkdir -p $(objtree)/tools
1353 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1355 # ---------------------------------------------------------------------------
1360 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1363 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1365 PHONY += kselftest-merge
1367 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1368 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1369 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1370 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1372 # ---------------------------------------------------------------------------
1375 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1376 dtstree := arch/$(SRCARCH)/boot/dts
1381 %.dtb: dt_binding_check include/config/kernel.release scripts_dtc
1382 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ $(dtstree)/$*.dt.yaml
1384 %.dtbo: dt_binding_check include/config/kernel.release scripts_dtc
1385 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ $(dtstree)/$*.dt.yaml
1387 PHONY += dtbs dtbs_install dtbs_check
1388 dtbs: include/config/kernel.release scripts_dtc
1389 $(Q)$(MAKE) $(build)=$(dtstree)
1391 ifneq ($(filter dtbs_check %.dtb %.dtbo, $(MAKECMDGOALS)),)
1393 dtbs: dt_binding_check
1399 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1401 ifdef CONFIG_OF_EARLY_FLATTREE
1407 PHONY += scripts_dtc
1408 scripts_dtc: scripts_basic
1409 $(Q)$(MAKE) $(build)=scripts/dtc
1411 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1412 export CHECK_DT_BINDING=y
1415 PHONY += dt_binding_check
1416 dt_binding_check: scripts_dtc
1417 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1419 # ---------------------------------------------------------------------------
1422 ifdef CONFIG_MODULES
1424 # By default, build modules as well
1428 # When we're building modules with modversions, we need to consider
1429 # the built-in objects during the descend as well, in order to
1430 # make sure the checksums are up to date before we record them.
1431 ifdef CONFIG_MODVERSIONS
1437 # A module can be listed more than once in obj-m resulting in
1438 # duplicate lines in modules.order files. Those are removed
1439 # using awk while concatenating to the final file.
1442 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1444 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1446 modules.order: $(subdir-modorder) FORCE
1447 $(call if_changed,modules_order)
1449 targets += modules.order
1451 # Target to prepare building external modules
1452 PHONY += modules_prepare
1453 modules_prepare: prepare
1454 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1456 export modules_sign_only :=
1458 ifeq ($(CONFIG_MODULE_SIG),y)
1459 PHONY += modules_sign
1460 modules_sign: modules_install
1463 # modules_sign is a subset of modules_install.
1464 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1465 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1466 modules_sign_only := y
1471 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1472 modinst_pre := __modinst_pre
1475 modules_install: $(modinst_pre)
1476 PHONY += __modinst_pre
1478 @rm -rf $(MODLIB)/kernel
1479 @rm -f $(MODLIB)/source
1480 @mkdir -p $(MODLIB)/kernel
1481 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1482 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1483 rm -f $(MODLIB)/build ; \
1484 ln -s $(CURDIR) $(MODLIB)/build ; \
1486 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1487 @cp -f modules.builtin $(MODLIB)/
1488 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1490 endif # CONFIG_MODULES
1493 # Cleaning is done on three levels.
1494 # make clean Delete most generated files
1495 # Leave enough to build external modules
1496 # make mrproper Delete the current configuration, and all generated files
1497 # make distclean Remove editor backup files, patch leftover files and the like
1499 # Directories & files removed with 'make clean'
1500 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1501 modules.builtin modules.builtin.modinfo modules.nsdeps \
1502 compile_commands.json .thinlto-cache
1504 # Directories & files removed with 'make mrproper'
1505 MRPROPER_FILES += include/config include/generated \
1506 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1507 debian snap tar-install \
1508 .config .config.old .version \
1510 certs/signing_key.pem certs/signing_key.x509 \
1515 # clean - Delete most, but leave enough to build external modules
1517 clean: rm-files := $(CLEAN_FILES)
1519 PHONY += archclean vmlinuxclean
1522 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1523 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1525 clean: archclean vmlinuxclean resolve_btfids_clean
1527 # mrproper - Delete all generated files, including .config
1529 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1530 mrproper-dirs := $(addprefix _mrproper_,scripts)
1532 PHONY += $(mrproper-dirs) mrproper
1534 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1536 mrproper: clean $(mrproper-dirs)
1544 @find . $(RCS_FIND_IGNORE) \
1545 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1546 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1547 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1548 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1549 -type f -print | xargs rm -f
1552 # Packaging of the kernel to various formats
1553 # ---------------------------------------------------------------------------
1556 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1557 %pkg: include/config/kernel.release FORCE
1558 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1560 # Brief documentation of the typical targets used
1561 # ---------------------------------------------------------------------------
1563 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1564 boards := $(sort $(notdir $(boards)))
1565 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1566 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1570 @echo 'Cleaning targets:'
1571 @echo ' clean - Remove most generated files but keep the config and'
1572 @echo ' enough build support to build external modules'
1573 @echo ' mrproper - Remove all generated files + config + various backup files'
1574 @echo ' distclean - mrproper + remove editor backup and patch files'
1576 @echo 'Configuration targets:'
1577 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1579 @echo 'Other generic targets:'
1580 @echo ' all - Build all targets marked with [*]'
1581 @echo '* vmlinux - Build the bare kernel'
1582 @echo '* modules - Build all modules'
1583 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1584 @echo ' dir/ - Build all files in dir and below'
1585 @echo ' dir/file.[ois] - Build specified target only'
1586 @echo ' dir/file.ll - Build the LLVM assembly file'
1587 @echo ' (requires compiler support for LLVM assembly generation)'
1588 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1589 @echo ' (requires a recent binutils and recent build (System.map))'
1590 @echo ' dir/file.ko - Build module including final link'
1591 @echo ' modules_prepare - Set up for building external modules'
1592 @echo ' tags/TAGS - Generate tags file for editors'
1593 @echo ' cscope - Generate cscope index'
1594 @echo ' gtags - Generate GNU GLOBAL index'
1595 @echo ' kernelrelease - Output the release version string (use with make -s)'
1596 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1597 @echo ' image_name - Output the image name (use with make -s)'
1598 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1599 echo ' (default: $(INSTALL_HDR_PATH))'; \
1601 @echo 'Static analysers:'
1602 @echo ' checkstack - Generate a list of stack hogs'
1603 @echo ' versioncheck - Sanity check on version.h usage'
1604 @echo ' includecheck - Check for duplicate included header files'
1605 @echo ' export_report - List the usages of all exported symbols'
1606 @echo ' headerdep - Detect inclusion cycles in headers'
1607 @echo ' coccicheck - Check with Coccinelle'
1608 @echo ' clang-analyzer - Check with clang static analyzer'
1609 @echo ' clang-tidy - Check with clang-tidy'
1612 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1614 @echo 'Kernel selftest:'
1615 @echo ' kselftest - Build and run kernel selftest'
1616 @echo ' Build, install, and boot kernel before'
1617 @echo ' running kselftest on it'
1618 @echo ' Run as root for full coverage'
1619 @echo ' kselftest-all - Build kernel selftest'
1620 @echo ' kselftest-install - Build and install kernel selftest'
1621 @echo ' kselftest-clean - Remove all generated kselftest files'
1622 @echo ' kselftest-merge - Merge all the config dependencies of'
1623 @echo ' kselftest to existing .config.'
1626 echo 'Devicetree:'; \
1627 echo '* dtbs - Build device tree blobs for enabled boards'; \
1628 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1629 echo ' dt_binding_check - Validate device tree binding documents'; \
1630 echo ' dtbs_check - Validate device tree source files';\
1633 @echo 'Userspace tools targets:'
1634 @echo ' use "make tools/help"'
1635 @echo ' or "cd tools; make help"'
1637 @echo 'Kernel packaging:'
1638 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1640 @echo 'Documentation targets:'
1641 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1643 @echo 'Architecture specific targets ($(SRCARCH)):'
1644 @$(if $(archhelp),$(archhelp),\
1645 echo ' No architecture specific help defined for $(SRCARCH)')
1648 $(foreach b, $(boards), \
1649 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1651 @$(if $(board-dirs), \
1652 $(foreach b, $(board-dirs), \
1653 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1654 printf " %-16s - Show all of the above\\n" help-boards; \
1657 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1658 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1659 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1660 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1661 @echo ' (sparse by default)'
1662 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1663 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1664 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1665 @echo ' 1: warnings which may be relevant and do not occur too often'
1666 @echo ' 2: warnings which occur quite often but may still be relevant'
1667 @echo ' 3: more obscure warnings, can most likely be ignored'
1668 @echo ' Multiple levels can be combined with W=12 or W=123'
1670 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1671 @echo 'For further info see the ./README file'
1674 help-board-dirs := $(addprefix help-,$(board-dirs))
1676 help-boards: $(help-board-dirs)
1678 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1680 $(help-board-dirs): help-%:
1681 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1682 @$(if $(boards-per-dir), \
1683 $(foreach b, $(boards-per-dir), \
1684 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1688 # Documentation targets
1689 # ---------------------------------------------------------------------------
1690 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1691 linkcheckdocs dochelp refcheckdocs
1692 PHONY += $(DOC_TARGETS)
1694 $(Q)$(MAKE) $(build)=Documentation $@
1697 # ---------------------------------------------------------------------------
1699 PHONY += scripts_gdb
1700 scripts_gdb: prepare0
1701 $(Q)$(MAKE) $(build)=scripts/gdb
1702 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1704 ifdef CONFIG_GDB_SCRIPTS
1708 else # KBUILD_EXTMOD
1711 # External module support.
1712 # When building external modules the kernel used as basis is considered
1713 # read-only, and no consistency checks are made and the make
1714 # system is not used on the basis kernel. If updates are required
1715 # in the basis kernel ordinary make commands (without M=...) must be used.
1717 # We are always building only modules.
1721 build-dirs := $(KBUILD_EXTMOD)
1722 $(MODORDER): descend
1725 compile_commands.json: $(extmod_prefix)compile_commands.json
1726 PHONY += compile_commands.json
1728 clean-dirs := $(KBUILD_EXTMOD)
1729 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1730 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1733 # now expand this into a simple variable to reduce the cost of shell evaluations
1734 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1736 @if [ "$(CC_VERSION_TEXT)" != $(CONFIG_CC_VERSION_TEXT) ]; then \
1737 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1738 echo >&2 " The kernel was built by: "$(CONFIG_CC_VERSION_TEXT); \
1739 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1744 @echo ' Building external modules.'
1745 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1747 @echo ' modules - default target, build the module(s)'
1748 @echo ' modules_install - install the module'
1749 @echo ' clean - remove generated files in module directory only'
1752 # no-op for external module builds
1753 PHONY += modules_prepare
1755 endif # KBUILD_EXTMOD
1757 # ---------------------------------------------------------------------------
1760 PHONY += modules modules_install
1762 ifdef CONFIG_MODULES
1764 modules: modules_check
1765 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1767 PHONY += modules_check
1768 modules_check: $(MODORDER)
1769 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1771 quiet_cmd_depmod = DEPMOD $(MODLIB)
1772 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1776 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1779 else # CONFIG_MODULES
1781 # Modules not configured
1782 # ---------------------------------------------------------------------------
1784 modules modules_install:
1786 @echo >&2 '*** The present kernel configuration has modules disabled.'
1787 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1788 @echo >&2 '*** to enable CONFIG_MODULES.'
1792 endif # CONFIG_MODULES
1795 # ---------------------------------------------------------------------------
1796 # To build individual files in subdirectories, you can do like this:
1798 # make foo/bar/baz.s
1800 # The supported suffixes for single-target are listed in 'single-targets'
1802 # To build only under specific subdirectories, you can do like this:
1808 # .ko is special because modpost is needed
1809 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1810 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1812 $(single-ko): single_modpost
1814 $(single-no-ko): descend
1817 ifeq ($(KBUILD_EXTMOD),)
1818 # For the single build of in-tree modules, use a temporary file to avoid
1819 # the situation of modules_install installing an invalid modules.order.
1820 MODORDER := .modules.tmp
1823 PHONY += single_modpost
1824 single_modpost: $(single-no-ko) modules_prepare
1825 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
1826 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1830 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
1832 # trim unrelated directories
1833 build-dirs := $(foreach d, $(build-dirs), \
1834 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1838 ifndef CONFIG_MODULES
1842 # Handle descending into subdirectories listed in $(build-dirs)
1843 # Preset locale variables to speed up the build process. Limit locale
1844 # tweaks to this spot to avoid wrong language settings when running
1845 # make menuconfig etc.
1846 # Error messages still appears in the original language
1847 PHONY += descend $(build-dirs)
1848 descend: $(build-dirs)
1849 $(build-dirs): prepare
1850 $(Q)$(MAKE) $(build)=$@ \
1851 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1852 need-builtin=1 need-modorder=1
1854 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1855 PHONY += $(clean-dirs) clean
1857 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1859 clean: $(clean-dirs)
1861 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1862 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1864 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1865 -o -name '*.dwo' -o -name '*.lst' \
1866 -o -name '*.su' -o -name '*.mod' \
1867 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1868 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1869 -o -name '*.asn1.[ch]' \
1870 -o -name '*.symtypes' -o -name 'modules.order' \
1871 -o -name '.tmp_*.o.*' \
1872 -o -name '*.c.[012]*.*' \
1875 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1877 # Generate tags for editors
1878 # ---------------------------------------------------------------------------
1879 quiet_cmd_tags = GEN $@
1880 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1882 tags TAGS cscope gtags: FORCE
1885 # Script to generate missing namespace dependencies
1886 # ---------------------------------------------------------------------------
1889 nsdeps: export KBUILD_NSDEPS=1
1891 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1894 # ---------------------------------------------------------------------------
1896 quiet_cmd_gen_compile_commands = GEN $@
1897 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1899 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1900 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1901 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1902 $(call if_changed,gen_compile_commands)
1904 targets += $(extmod_prefix)compile_commands.json
1906 PHONY += clang-tidy clang-analyzer
1908 ifdef CONFIG_CC_IS_CLANG
1909 quiet_cmd_clang_tools = CHECK $<
1910 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1912 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1913 $(call cmd,clang_tools)
1915 clang-tidy clang-analyzer:
1916 @echo "$@ requires CC=clang" >&2
1920 # Scripts to check various things for consistency
1921 # ---------------------------------------------------------------------------
1923 PHONY += includecheck versioncheck coccicheck export_report
1926 find $(srctree)/* $(RCS_FIND_IGNORE) \
1927 -name '*.[hcS]' -type f -print | sort \
1928 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1931 find $(srctree)/* $(RCS_FIND_IGNORE) \
1932 -name '*.[hcS]' -type f -print | sort \
1933 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1936 $(Q)$(BASH) $(srctree)/scripts/$@
1939 $(PERL) $(srctree)/scripts/export_report.pl
1941 PHONY += checkstack kernelrelease kernelversion image_name
1943 # UML needs a little special treatment here. It wants to use the host
1944 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1945 # else wants $(ARCH), including people doing cross-builds, which means
1946 # that $(SUBARCH) doesn't work here.
1948 CHECKSTACK_ARCH := $(SUBARCH)
1950 CHECKSTACK_ARCH := $(ARCH)
1953 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1954 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1957 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1960 @echo $(KERNELVERSION)
1963 @echo $(KBUILD_IMAGE)
1965 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1966 cmd_rmfiles = rm -rf $(rm-files)
1968 # read saved command lines for existing targets
1969 existing-targets := $(wildcard $(sort $(targets)))
1971 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1973 endif # config-build
1975 endif # need-sub-make
1980 # Declare the contents of the PHONY variable as phony. We keep that
1981 # information in a variable so we can use it in if_changed and friends.