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 := $(shell getconf LFS_LIBS 2>/dev/null)
427 ifneq ($(filter %/,$(LLVM)),)
428 LLVM_PREFIX := $(LLVM)
429 else ifneq ($(filter -%,$(LLVM)),)
430 LLVM_SUFFIX := $(LLVM)
433 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
434 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
439 HOSTPKG_CONFIG = pkg-config
441 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
442 -O2 -fomit-frame-pointer -std=gnu11 \
443 -Wdeclaration-after-statement
444 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
445 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
447 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
448 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
449 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
450 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
452 # Make variables (CC, etc...)
455 CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
456 LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
457 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
458 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
459 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
460 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
461 READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
462 STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
464 CC = $(CROSS_COMPILE)gcc
465 LD = $(CROSS_COMPILE)ld
466 AR = $(CROSS_COMPILE)ar
467 NM = $(CROSS_COMPILE)nm
468 OBJCOPY = $(CROSS_COMPILE)objcopy
469 OBJDUMP = $(CROSS_COMPILE)objdump
470 READELF = $(CROSS_COMPILE)readelf
471 STRIP = $(CROSS_COMPILE)strip
474 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
478 INSTALLKERNEL := installkernel
492 PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
494 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
495 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
504 # Use USERINCLUDE when you must reference the UAPI directories only.
506 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
507 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
508 -I$(srctree)/include/uapi \
509 -I$(objtree)/include/generated/uapi \
510 -include $(srctree)/include/linux/compiler-version.h \
511 -include $(srctree)/include/linux/kconfig.h
513 # Use LINUXINCLUDE when you must reference the include/ directory.
514 # Needed to be compatible with the O= option
516 -I$(srctree)/arch/$(SRCARCH)/include \
517 -I$(objtree)/arch/$(SRCARCH)/include/generated \
518 $(if $(building_out_of_srctree),-I$(srctree)/include) \
519 -I$(objtree)/include \
522 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
523 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
524 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
525 -Werror=implicit-function-declaration -Werror=implicit-int \
526 -Werror=return-type -Wno-format-security \
528 KBUILD_CPPFLAGS := -D__KERNEL__
529 KBUILD_AFLAGS_KERNEL :=
530 KBUILD_CFLAGS_KERNEL :=
531 KBUILD_AFLAGS_MODULE := -DMODULE
532 KBUILD_CFLAGS_MODULE := -DMODULE
533 KBUILD_LDFLAGS_MODULE :=
537 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
538 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
539 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
540 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
541 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
542 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
544 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
545 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
546 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
547 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
548 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
551 # Files to ignore in find ... statements
553 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
554 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
556 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
557 --exclude CVS --exclude .pc --exclude .hg --exclude .git
559 # ===========================================================================
560 # Rules shared between *config targets and build targets
562 # Basic helpers built in scripts/basic/
563 PHONY += scripts_basic
565 $(Q)$(MAKE) $(build)=scripts/basic
567 PHONY += outputmakefile
568 ifdef building_out_of_srctree
569 # Before starting out-of-tree build, make sure the source tree is clean.
570 # outputmakefile generates a Makefile in the output directory, if using a
571 # separate output directory. This allows convenient use of make in the
573 # At the same time when output Makefile generated, generate .gitignore to
574 # ignore whole output directory
576 quiet_cmd_makefile = GEN Makefile
578 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
579 echo "include $(srctree)/Makefile"; \
583 $(Q)if [ -f $(srctree)/.config -o \
584 -d $(srctree)/include/config -o \
585 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
587 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
588 echo >&2 "*** in $(abs_srctree)";\
592 $(Q)ln -fsn $(srctree) source
594 $(Q)test -e .gitignore || \
595 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
598 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
599 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
600 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
601 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
602 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
604 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
605 include $(srctree)/scripts/Makefile.clang
608 # Include this also for config targets because some architectures need
609 # cc-cross-prefix to determine CROSS_COMPILE.
611 include $(srctree)/scripts/Makefile.compiler
615 # ===========================================================================
616 # *config targets only - make sure prerequisites are updated, and descend
617 # in scripts/kconfig to make the *config target
619 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
620 # KBUILD_DEFCONFIG may point out an alternative default configuration
621 # used for 'make defconfig'
622 include $(srctree)/arch/$(SRCARCH)/Makefile
623 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
625 config: outputmakefile scripts_basic FORCE
626 $(Q)$(MAKE) $(build)=scripts/kconfig $@
628 %config: outputmakefile scripts_basic FORCE
629 $(Q)$(MAKE) $(build)=scripts/kconfig $@
632 # ===========================================================================
633 # Build targets only - this includes vmlinux, arch specific targets, clean
634 # targets and others. In general all targets except *config targets.
636 # If building an external module we do not care about the all: rule
637 # but instead __all depend on modules
639 ifeq ($(KBUILD_EXTMOD),)
645 # Decide whether to build built-in, modular, or both.
646 # Normally, just do built-in.
651 # If we have only "make modules", don't compile built-in objects.
652 ifeq ($(MAKECMDGOALS),modules)
656 # If we have "make <whatever> modules", compile modules
657 # in addition to whatever we do anyway.
658 # Just "make" or "make all" shall build modules as well
660 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
664 ifeq ($(MAKECMDGOALS),)
668 export KBUILD_MODULES KBUILD_BUILTIN
671 include include/config/auto.conf
674 ifeq ($(KBUILD_EXTMOD),)
675 # Objects we will link into vmlinux / subdirs we need to visit
676 core-y := init/ usr/ arch/$(SRCARCH)/
677 drivers-y := drivers/ sound/
678 drivers-$(CONFIG_SAMPLES) += samples/
679 drivers-$(CONFIG_NET) += net/
682 endif # KBUILD_EXTMOD
684 # The all: target is the default when no target is given on the
686 # This allow a user to issue only 'make' to build a kernel including modules
687 # Defaults to vmlinux, but the arch makefile usually adds further targets
690 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
691 ifdef CONFIG_CC_IS_GCC
692 CFLAGS_GCOV += -fno-tree-loop-im
696 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
697 ifdef CONFIG_FUNCTION_TRACER
698 CC_FLAGS_FTRACE := -pg
701 include $(srctree)/arch/$(SRCARCH)/Makefile
704 ifdef may-sync-config
705 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
706 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
707 # because some architectures define CROSS_COMPILE there.
708 include include/config/auto.conf.cmd
712 @echo >&2 '*** Configuration file "$@" not found!'
714 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
715 @echo >&2 '*** "make menuconfig" or "make xconfig").'
719 # The actual configuration files used during the build are stored in
720 # include/generated/ and include/config/. Update them if .config is newer than
721 # include/config/auto.conf (which mirrors .config).
723 # This exploits the 'multi-target pattern rule' trick.
724 # The syncconfig should be executed only once to make all the targets.
725 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
727 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
728 # so you cannot notice that Kconfig is waiting for the user input.
729 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
730 $(Q)$(kecho) " SYNC $@"
731 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
732 else # !may-sync-config
733 # External modules and some install targets need include/generated/autoconf.h
734 # and include/config/auto.conf but do not care if they are up-to-date.
735 # Use auto.conf to trigger the test
736 PHONY += include/config/auto.conf
738 include/config/auto.conf:
739 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
741 echo >&2 " ERROR: Kernel configuration is invalid."; \
742 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
743 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
747 endif # may-sync-config
750 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
751 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
752 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
753 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
754 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
756 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
758 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
760 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
764 # Tell gcc to never replace conditional load with a non-conditional one
765 ifdef CONFIG_CC_IS_GCC
766 # gcc-10 renamed --param=allow-store-data-races=0 to
767 # -fno-allow-store-data-races.
768 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
769 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
772 ifdef CONFIG_READABLE_ASM
773 # Disable optimizations that make assembler listings hard to read.
774 # reorder blocks reorders the control in the function
775 # ipa clone creates specialized cloned functions
776 # partial inlining inlines only parts of functions
777 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
780 ifneq ($(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 += $(stackp-flags-y)
790 KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror
791 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
792 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
794 ifdef CONFIG_CC_IS_CLANG
795 KBUILD_CPPFLAGS += -Qunused-arguments
796 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
797 KBUILD_CFLAGS += -Wno-gnu
800 # gcc inanely warns about local variables called 'main'
801 KBUILD_CFLAGS += -Wno-main
804 # These warnings generated too much noise in a regular build.
805 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
806 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
807 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
809 # These result in bogus false positives
810 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
812 ifdef CONFIG_FRAME_POINTER
813 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
815 # Some targets (ARM with Thumb2, for example), can't be built with frame
816 # pointers. For those, we don't have FUNCTION_TRACER automatically
817 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
818 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
819 # -fomit-frame-pointer with FUNCTION_TRACER.
820 ifndef CONFIG_FUNCTION_TRACER
821 KBUILD_CFLAGS += -fomit-frame-pointer
825 # Initialize all stack variables with a 0xAA pattern.
826 ifdef CONFIG_INIT_STACK_ALL_PATTERN
827 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
830 # Initialize all stack variables with a zero value.
831 ifdef CONFIG_INIT_STACK_ALL_ZERO
832 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
833 ifdef CONFIG_CC_IS_CLANG
834 # https://bugs.llvm.org/show_bug.cgi?id=45497
835 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
839 # While VLAs have been removed, GCC produces unreachable stack probes
840 # for the randomize_kstack_offset feature. Disable it for all compilers.
841 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
843 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
844 ifdef CONFIG_ZERO_CALL_USED_REGS
845 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
848 ifdef CONFIG_FUNCTION_TRACER
849 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
850 CC_FLAGS_FTRACE += -mrecord-mcount
851 ifdef CONFIG_HAVE_NOP_MCOUNT
852 ifeq ($(call cc-option-yn, -mnop-mcount),y)
853 CC_FLAGS_FTRACE += -mnop-mcount
854 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
858 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
859 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
861 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
862 ifdef CONFIG_HAVE_C_RECORDMCOUNT
863 BUILD_C_RECORDMCOUNT := y
864 export BUILD_C_RECORDMCOUNT
867 ifdef CONFIG_HAVE_FENTRY
868 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
869 ifeq ($(call cc-option-yn, -mfentry),y)
870 CC_FLAGS_FTRACE += -mfentry
871 CC_FLAGS_USING += -DCC_USING_FENTRY
874 export CC_FLAGS_FTRACE
875 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
876 KBUILD_AFLAGS += $(CC_FLAGS_USING)
879 # We trigger additional mismatches with less inlining
880 ifdef CONFIG_DEBUG_SECTION_MISMATCH
881 KBUILD_CFLAGS += -fno-inline-functions-called-once
884 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
885 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
886 LDFLAGS_vmlinux += --gc-sections
889 ifdef CONFIG_SHADOW_CALL_STACK
890 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
891 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
895 ifdef CONFIG_LTO_CLANG
896 ifdef CONFIG_LTO_CLANG_THIN
897 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
898 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
900 CC_FLAGS_LTO := -flto
902 CC_FLAGS_LTO += -fvisibility=hidden
904 # Limit inlining across translation units to reduce binary size
905 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
907 # Check for frame size exceeding threshold during prolog/epilog insertion
908 # when using lld < 13.0.0.
909 ifneq ($(CONFIG_FRAME_WARN),0)
910 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
911 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
917 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
918 KBUILD_AFLAGS += -fno-lto
922 ifdef CONFIG_CFI_CLANG
923 CC_FLAGS_CFI := -fsanitize=cfi \
924 -fsanitize-cfi-cross-dso \
925 -fno-sanitize-cfi-canonical-jump-tables \
926 -fno-sanitize-trap=cfi \
927 -fno-sanitize-blacklist
929 ifdef CONFIG_CFI_PERMISSIVE
930 CC_FLAGS_CFI += -fsanitize-recover=cfi
933 # If LTO flags are filtered out, we must also filter out CFI.
934 CC_FLAGS_LTO += $(CC_FLAGS_CFI)
935 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
939 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
940 KBUILD_CFLAGS += -falign-functions=64
943 # arch Makefile may override CC so keep this after arch Makefile is included
944 NOSTDINC_FLAGS += -nostdinc
946 # warn about C99 declaration after statement
947 KBUILD_CFLAGS += -Wdeclaration-after-statement
949 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
950 KBUILD_CFLAGS += -Wvla
952 # disable pointer signed / unsigned warnings in gcc 4.0
953 KBUILD_CFLAGS += -Wno-pointer-sign
955 # In order to make sure new function cast mismatches are not introduced
956 # in the kernel (to avoid tripping CFI checking), the kernel should be
957 # globally built with -Wcast-function-type.
958 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
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, stringop-overflow)
966 # Another good warning that we'll want to enable eventually
967 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
969 # Enabled with W=2, disabled by default as noisy
970 ifdef CONFIG_CC_IS_GCC
971 KBUILD_CFLAGS += -Wno-maybe-uninitialized
974 ifdef CONFIG_CC_IS_GCC
975 # The allocators already balk at large sizes, so silence the compiler
976 # warnings for bounds checks involving those possible values. While
977 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
978 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
979 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
980 # doesn't work (as it is documented to), silently resolving to "0" prior to
981 # version 9.1 (and producing an error more recently). Numeric values larger
982 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
983 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
984 # choice, we must perform a versioned check to disable this warning.
985 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
986 KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than)
989 # disable invalid "can't wrap" optimizations for signed / pointers
990 KBUILD_CFLAGS += -fno-strict-overflow
992 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
993 KBUILD_CFLAGS += -fno-stack-check
995 # conserve stack if available
996 ifdef CONFIG_CC_IS_GCC
997 KBUILD_CFLAGS += -fconserve-stack
1000 # Prohibit date/time macros, which would make the build non-deterministic
1001 KBUILD_CFLAGS += -Werror=date-time
1003 # enforce correct pointer usage
1004 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
1006 # Require designated initializers for all marked structures
1007 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1009 # change __FILE__ to the relative path from the srctree
1010 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1012 # include additional Makefiles when needed
1013 include-y := scripts/Makefile.extrawarn
1014 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1015 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1016 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1017 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1018 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1019 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct
1020 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1022 include $(addprefix $(srctree)/, $(include-y))
1024 # scripts/Makefile.gcc-plugins is intentionally included last.
1025 # Do not add $(call cc-option,...) below this line. When you build the kernel
1026 # from the clean source tree, the GCC plugins do not exist at this point.
1028 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1029 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1030 KBUILD_AFLAGS += $(KAFLAGS)
1031 KBUILD_CFLAGS += $(KCFLAGS)
1033 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1034 LDFLAGS_vmlinux += --build-id=sha1
1036 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1037 LDFLAGS_vmlinux += $(call ld-option, -X,)
1040 ifeq ($(CONFIG_RELR),y)
1041 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1044 # We never want expected sections to be placed heuristically by the
1045 # linker. All sections should be explicitly named in the linker script.
1046 ifdef CONFIG_LD_ORPHAN_WARN
1047 LDFLAGS_vmlinux += --orphan-handling=warn
1050 # Align the bit size of userspace programs with the kernel
1051 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1052 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1054 # make the checker run with the right architecture
1055 CHECKFLAGS += --arch=$(ARCH)
1057 # insure the checker run with the right endianness
1058 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1060 # the checker needs the correct machine size
1061 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1063 # Default kernel image to build when no specific target is given.
1064 # KBUILD_IMAGE may be overruled on the command line or
1065 # set in the environment
1066 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1067 # this default value
1068 export KBUILD_IMAGE ?= vmlinux
1071 # INSTALL_PATH specifies where to place the updated kernel and system map
1072 # images. Default is /boot, but you can set it to other values
1073 export INSTALL_PATH ?= /boot
1076 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1077 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1078 # an argument if needed. Otherwise it defaults to the kernel install path
1080 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1083 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1084 # relocations required by build roots. This is not defined in the
1085 # makefile but the argument can be passed to make if needed.
1088 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1093 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1094 export MODORDER := $(extmod_prefix)modules.order
1095 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1097 ifeq ($(KBUILD_EXTMOD),)
1098 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/
1099 core-$(CONFIG_BLOCK) += block/
1101 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1102 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1103 $(libs-y) $(libs-m)))
1105 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1106 $(patsubst %/,%,$(filter %/, $(core-) \
1107 $(drivers-) $(libs-))))
1109 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1110 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1111 $(drivers-y) $(drivers-m)))
1113 build-dirs := $(vmlinux-dirs)
1114 clean-dirs := $(vmlinux-alldirs)
1116 # Externally visible symbols (used by link-vmlinux.sh)
1117 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1118 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1119 ifdef CONFIG_MODULES
1120 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1121 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1123 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1125 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1127 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1128 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1129 # used by scripts/Makefile.package
1130 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1132 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1134 # Recurse until adjust_autoksyms.sh is satisfied
1135 PHONY += autoksyms_recursive
1136 ifdef CONFIG_TRIM_UNUSED_KSYMS
1137 # For the kernel to actually contain only the needed exported symbols,
1138 # we have to build modules as well to determine what those symbols are.
1139 # (this can be evaluated only once include/config/auto.conf has been included)
1142 autoksyms_recursive: descend modules.order
1143 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1144 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1147 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1149 quiet_cmd_autoksyms_h = GEN $@
1150 cmd_autoksyms_h = mkdir -p $(dir $@); \
1151 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1154 $(call cmd,autoksyms_h)
1156 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1158 # Final link of vmlinux with optional arch pass after final link
1159 cmd_link-vmlinux = \
1160 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1161 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1163 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1164 +$(call if_changed_dep,link-vmlinux)
1168 # The actual objects are generated when descending,
1169 # make sure no implicit rule kicks in
1170 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1172 filechk_kernel.release = \
1173 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1175 # Store (new) KERNELRELEASE string in include/config/kernel.release
1176 include/config/kernel.release: FORCE
1177 $(call filechk,kernel.release)
1179 # Additional helpers built in scripts/
1180 # Carefully list dependencies so we do not try to build scripts twice
1183 scripts: scripts_basic scripts_dtc
1184 $(Q)$(MAKE) $(build)=$(@)
1186 # Things we need to do before we recursively start building the kernel
1187 # or the modules are listed in "prepare".
1188 # A multi level approach is used. prepareN is processed before prepareN-1.
1189 # archprepare is used in arch Makefiles and when processed asm symlink,
1190 # version.h and scripts_basic is processed / created.
1192 PHONY += prepare archprepare
1194 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1195 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1196 include/generated/autoconf.h remove-stale-files
1198 prepare0: archprepare
1199 $(Q)$(MAKE) $(build)=scripts/mod
1200 $(Q)$(MAKE) $(build)=.
1202 # All the preparing..
1205 PHONY += remove-stale-files
1207 $(Q)$(srctree)/scripts/remove-stale-files
1209 # Support for using generic headers in asm-generic
1210 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1212 PHONY += asm-generic uapi-asm-generic
1213 asm-generic: uapi-asm-generic
1214 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1215 generic=include/asm-generic
1217 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1218 generic=include/uapi/asm-generic
1220 # Generate some files
1221 # ---------------------------------------------------------------------------
1223 # KERNELRELEASE can change from a few different places, meaning version.h
1224 # needs to be updated, so this check is forced on all builds
1227 define filechk_utsrelease.h
1228 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1229 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1232 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1235 define filechk_version.h
1236 if [ $(SUBLEVEL) -gt 255 ]; then \
1237 echo \#define LINUX_VERSION_CODE $(shell \
1238 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1240 echo \#define LINUX_VERSION_CODE $(shell \
1241 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1243 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1244 ((c) > 255 ? 255 : (c)))'; \
1245 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1246 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1247 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1250 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1251 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1253 $(call filechk,version.h)
1255 include/generated/utsrelease.h: include/config/kernel.release FORCE
1256 $(call filechk,utsrelease.h)
1260 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1261 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1263 # ---------------------------------------------------------------------------
1266 #Default location for installed headers
1267 export INSTALL_HDR_PATH = $(objtree)/usr
1269 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1270 cmd_headers_install = \
1271 mkdir -p $(INSTALL_HDR_PATH); \
1272 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1273 usr/include $(INSTALL_HDR_PATH)
1275 PHONY += headers_install
1276 headers_install: headers
1277 $(call cmd,headers_install)
1279 PHONY += archheaders archscripts
1281 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1284 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1285 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1286 $(error Headers not exportable for the $(SRCARCH) architecture))
1287 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1288 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1290 ifdef CONFIG_HEADERS_INSTALL
1294 PHONY += scripts_unifdef
1295 scripts_unifdef: scripts_basic
1296 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1298 # ---------------------------------------------------------------------------
1301 # Many distributions have the custom install script, /sbin/installkernel.
1302 # If DKMS is installed, 'make install' will eventually recurse back
1303 # to this Makefile to build and install external modules.
1304 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1306 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1307 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1309 # ---------------------------------------------------------------------------
1312 ifdef CONFIG_OBJTOOL
1313 prepare: tools/objtool
1317 ifdef CONFIG_DEBUG_INFO_BTF
1318 prepare: tools/bpf/resolve_btfids
1322 PHONY += resolve_btfids_clean
1324 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1326 # tools/bpf/resolve_btfids directory might not exist
1327 # in output directory, skip its clean in that case
1328 resolve_btfids_clean:
1329 ifneq ($(wildcard $(resolve_btfids_O)),)
1330 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1333 # Clear a bunch of variables before executing the submake
1334 ifeq ($(quiet),silent_)
1339 $(Q)mkdir -p $(objtree)/tools
1340 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1343 $(Q)mkdir -p $(objtree)/tools
1344 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1346 # ---------------------------------------------------------------------------
1351 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1354 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1356 PHONY += kselftest-merge
1358 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1359 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1360 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1361 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1363 # ---------------------------------------------------------------------------
1366 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1367 dtstree := arch/$(SRCARCH)/boot/dts
1372 %.dtb: include/config/kernel.release scripts_dtc
1373 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1375 %.dtbo: include/config/kernel.release scripts_dtc
1376 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1378 PHONY += dtbs dtbs_install dtbs_check
1379 dtbs: include/config/kernel.release scripts_dtc
1380 $(Q)$(MAKE) $(build)=$(dtstree)
1382 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1384 dtbs: dt_binding_check
1390 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1392 ifdef CONFIG_OF_EARLY_FLATTREE
1398 PHONY += scripts_dtc
1399 scripts_dtc: scripts_basic
1400 $(Q)$(MAKE) $(build)=scripts/dtc
1402 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1403 export CHECK_DT_BINDING=y
1406 PHONY += dt_binding_check
1407 dt_binding_check: scripts_dtc
1408 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1410 # ---------------------------------------------------------------------------
1413 ifdef CONFIG_MODULES
1415 # By default, build modules as well
1419 # When we're building modules with modversions, we need to consider
1420 # the built-in objects during the descend as well, in order to
1421 # make sure the checksums are up to date before we record them.
1422 ifdef CONFIG_MODVERSIONS
1428 # A module can be listed more than once in obj-m resulting in
1429 # duplicate lines in modules.order files. Those are removed
1430 # using awk while concatenating to the final file.
1433 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1435 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1437 modules.order: $(subdir-modorder) FORCE
1438 $(call if_changed,modules_order)
1440 targets += modules.order
1442 # Target to prepare building external modules
1443 PHONY += modules_prepare
1444 modules_prepare: prepare
1445 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1447 export modules_sign_only :=
1449 ifeq ($(CONFIG_MODULE_SIG),y)
1450 PHONY += modules_sign
1451 modules_sign: modules_install
1454 # modules_sign is a subset of modules_install.
1455 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1456 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1457 modules_sign_only := y
1462 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1463 modinst_pre := __modinst_pre
1466 modules_install: $(modinst_pre)
1467 PHONY += __modinst_pre
1469 @rm -rf $(MODLIB)/kernel
1470 @rm -f $(MODLIB)/source
1471 @mkdir -p $(MODLIB)/kernel
1472 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1473 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1474 rm -f $(MODLIB)/build ; \
1475 ln -s $(CURDIR) $(MODLIB)/build ; \
1477 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1478 @cp -f modules.builtin $(MODLIB)/
1479 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1481 endif # CONFIG_MODULES
1484 # Cleaning is done on three levels.
1485 # make clean Delete most generated files
1486 # Leave enough to build external modules
1487 # make mrproper Delete the current configuration, and all generated files
1488 # make distclean Remove editor backup files, patch leftover files and the like
1490 # Directories & files removed with 'make clean'
1491 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1492 modules.builtin modules.builtin.modinfo modules.nsdeps \
1493 compile_commands.json .thinlto-cache
1495 # Directories & files removed with 'make mrproper'
1496 MRPROPER_FILES += include/config include/generated \
1497 arch/$(SRCARCH)/include/generated .objdiff \
1498 debian snap tar-install \
1499 .config .config.old .version \
1501 certs/signing_key.pem \
1506 # clean - Delete most, but leave enough to build external modules
1508 clean: rm-files := $(CLEAN_FILES)
1510 PHONY += archclean vmlinuxclean
1513 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1514 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1516 clean: archclean vmlinuxclean resolve_btfids_clean
1518 # mrproper - Delete all generated files, including .config
1520 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1521 mrproper-dirs := $(addprefix _mrproper_,scripts)
1523 PHONY += $(mrproper-dirs) mrproper
1525 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1527 mrproper: clean $(mrproper-dirs)
1535 @find . $(RCS_FIND_IGNORE) \
1536 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1537 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1538 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1539 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1540 -type f -print | xargs rm -f
1543 # Packaging of the kernel to various formats
1544 # ---------------------------------------------------------------------------
1547 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1548 %pkg: include/config/kernel.release FORCE
1549 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1551 # Brief documentation of the typical targets used
1552 # ---------------------------------------------------------------------------
1554 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1555 boards := $(sort $(notdir $(boards)))
1556 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1557 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1561 @echo 'Cleaning targets:'
1562 @echo ' clean - Remove most generated files but keep the config and'
1563 @echo ' enough build support to build external modules'
1564 @echo ' mrproper - Remove all generated files + config + various backup files'
1565 @echo ' distclean - mrproper + remove editor backup and patch files'
1567 @echo 'Configuration targets:'
1568 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1570 @echo 'Other generic targets:'
1571 @echo ' all - Build all targets marked with [*]'
1572 @echo '* vmlinux - Build the bare kernel'
1573 @echo '* modules - Build all modules'
1574 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1575 @echo ' dir/ - Build all files in dir and below'
1576 @echo ' dir/file.[ois] - Build specified target only'
1577 @echo ' dir/file.ll - Build the LLVM assembly file'
1578 @echo ' (requires compiler support for LLVM assembly generation)'
1579 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1580 @echo ' (requires a recent binutils and recent build (System.map))'
1581 @echo ' dir/file.ko - Build module including final link'
1582 @echo ' modules_prepare - Set up for building external modules'
1583 @echo ' tags/TAGS - Generate tags file for editors'
1584 @echo ' cscope - Generate cscope index'
1585 @echo ' gtags - Generate GNU GLOBAL index'
1586 @echo ' kernelrelease - Output the release version string (use with make -s)'
1587 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1588 @echo ' image_name - Output the image name (use with make -s)'
1589 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1590 echo ' (default: $(INSTALL_HDR_PATH))'; \
1592 @echo 'Static analysers:'
1593 @echo ' checkstack - Generate a list of stack hogs'
1594 @echo ' versioncheck - Sanity check on version.h usage'
1595 @echo ' includecheck - Check for duplicate included header files'
1596 @echo ' export_report - List the usages of all exported symbols'
1597 @echo ' headerdep - Detect inclusion cycles in headers'
1598 @echo ' coccicheck - Check with Coccinelle'
1599 @echo ' clang-analyzer - Check with clang static analyzer'
1600 @echo ' clang-tidy - Check with clang-tidy'
1603 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1605 @echo 'Kernel selftest:'
1606 @echo ' kselftest - Build and run kernel selftest'
1607 @echo ' Build, install, and boot kernel before'
1608 @echo ' running kselftest on it'
1609 @echo ' Run as root for full coverage'
1610 @echo ' kselftest-all - Build kernel selftest'
1611 @echo ' kselftest-install - Build and install kernel selftest'
1612 @echo ' kselftest-clean - Remove all generated kselftest files'
1613 @echo ' kselftest-merge - Merge all the config dependencies of'
1614 @echo ' kselftest to existing .config.'
1617 echo 'Devicetree:'; \
1618 echo '* dtbs - Build device tree blobs for enabled boards'; \
1619 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1620 echo ' dt_binding_check - Validate device tree binding documents'; \
1621 echo ' dtbs_check - Validate device tree source files';\
1624 @echo 'Userspace tools targets:'
1625 @echo ' use "make tools/help"'
1626 @echo ' or "cd tools; make help"'
1628 @echo 'Kernel packaging:'
1629 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1631 @echo 'Documentation targets:'
1632 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1634 @echo 'Architecture specific targets ($(SRCARCH)):'
1636 echo ' No architecture specific help defined for $(SRCARCH)')
1639 $(foreach b, $(boards), \
1640 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1642 @$(if $(board-dirs), \
1643 $(foreach b, $(board-dirs), \
1644 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1645 printf " %-16s - Show all of the above\\n" help-boards; \
1648 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1649 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1650 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1651 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1652 @echo ' (sparse by default)'
1653 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1654 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1655 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1656 @echo ' 1: warnings which may be relevant and do not occur too often'
1657 @echo ' 2: warnings which occur quite often but may still be relevant'
1658 @echo ' 3: more obscure warnings, can most likely be ignored'
1659 @echo ' e: warnings are being treated as errors'
1660 @echo ' Multiple levels can be combined with W=12 or W=123'
1662 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1663 @echo 'For further info see the ./README file'
1666 help-board-dirs := $(addprefix help-,$(board-dirs))
1668 help-boards: $(help-board-dirs)
1670 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1672 $(help-board-dirs): help-%:
1673 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1674 @$(if $(boards-per-dir), \
1675 $(foreach b, $(boards-per-dir), \
1676 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1680 # Documentation targets
1681 # ---------------------------------------------------------------------------
1682 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1683 linkcheckdocs dochelp refcheckdocs
1684 PHONY += $(DOC_TARGETS)
1686 $(Q)$(MAKE) $(build)=Documentation $@
1689 # ---------------------------------------------------------------------------
1691 PHONY += scripts_gdb
1692 scripts_gdb: prepare0
1693 $(Q)$(MAKE) $(build)=scripts/gdb
1694 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1696 ifdef CONFIG_GDB_SCRIPTS
1700 else # KBUILD_EXTMOD
1703 # External module support.
1704 # When building external modules the kernel used as basis is considered
1705 # read-only, and no consistency checks are made and the make
1706 # system is not used on the basis kernel. If updates are required
1707 # in the basis kernel ordinary make commands (without M=...) must be used.
1709 # We are always building only modules.
1713 build-dirs := $(KBUILD_EXTMOD)
1714 $(MODORDER): descend
1717 compile_commands.json: $(extmod_prefix)compile_commands.json
1718 PHONY += compile_commands.json
1720 clean-dirs := $(KBUILD_EXTMOD)
1721 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1722 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1725 # now expand this into a simple variable to reduce the cost of shell evaluations
1726 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1728 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1729 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1730 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1731 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1736 @echo ' Building external modules.'
1737 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1739 @echo ' modules - default target, build the module(s)'
1740 @echo ' modules_install - install the module'
1741 @echo ' clean - remove generated files in module directory only'
1744 # no-op for external module builds
1745 PHONY += modules_prepare
1747 endif # KBUILD_EXTMOD
1749 # ---------------------------------------------------------------------------
1752 PHONY += modules modules_install
1754 ifdef CONFIG_MODULES
1756 modules: modules_check
1757 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1759 PHONY += modules_check
1760 modules_check: $(MODORDER)
1761 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1763 quiet_cmd_depmod = DEPMOD $(MODLIB)
1764 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1768 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1771 else # CONFIG_MODULES
1773 # Modules not configured
1774 # ---------------------------------------------------------------------------
1776 modules modules_install:
1778 @echo >&2 '*** The present kernel configuration has modules disabled.'
1779 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1780 @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 := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1803 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1805 $(single-ko): single_modpost
1807 $(single-no-ko): descend
1810 ifeq ($(KBUILD_EXTMOD),)
1811 # For the single build of in-tree modules, use a temporary file to avoid
1812 # the situation of modules_install installing an invalid modules.order.
1813 MODORDER := .modules.tmp
1816 PHONY += single_modpost
1817 single_modpost: $(single-no-ko) modules_prepare
1818 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
1819 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1823 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
1825 # trim unrelated directories
1826 build-dirs := $(foreach d, $(build-dirs), \
1827 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1831 ifndef CONFIG_MODULES
1835 # Handle descending into subdirectories listed in $(build-dirs)
1836 # Preset locale variables to speed up the build process. Limit locale
1837 # tweaks to this spot to avoid wrong language settings when running
1838 # make menuconfig etc.
1839 # Error messages still appears in the original language
1840 PHONY += descend $(build-dirs)
1841 descend: $(build-dirs)
1842 $(build-dirs): prepare
1843 $(Q)$(MAKE) $(build)=$@ \
1844 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1845 need-builtin=1 need-modorder=1
1847 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1848 PHONY += $(clean-dirs) clean
1850 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1852 clean: $(clean-dirs)
1854 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1855 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1857 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1858 -o -name '*.dwo' -o -name '*.lst' \
1859 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \
1860 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1861 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1862 -o -name '*.asn1.[ch]' \
1863 -o -name '*.symtypes' -o -name 'modules.order' \
1865 -o -name '*.c.[012]*.*' \
1868 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1870 # Generate tags for editors
1871 # ---------------------------------------------------------------------------
1872 quiet_cmd_tags = GEN $@
1873 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1875 tags TAGS cscope gtags: FORCE
1878 # Script to generate missing namespace dependencies
1879 # ---------------------------------------------------------------------------
1882 nsdeps: export KBUILD_NSDEPS=1
1884 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1887 # ---------------------------------------------------------------------------
1889 quiet_cmd_gen_compile_commands = GEN $@
1890 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1892 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1893 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1894 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1895 $(call if_changed,gen_compile_commands)
1897 targets += $(extmod_prefix)compile_commands.json
1899 PHONY += clang-tidy clang-analyzer
1901 ifdef CONFIG_CC_IS_CLANG
1902 quiet_cmd_clang_tools = CHECK $<
1903 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1905 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1906 $(call cmd,clang_tools)
1908 clang-tidy clang-analyzer:
1909 @echo "$@ requires CC=clang" >&2
1913 # Scripts to check various things for consistency
1914 # ---------------------------------------------------------------------------
1916 PHONY += includecheck versioncheck coccicheck export_report
1919 find $(srctree)/* $(RCS_FIND_IGNORE) \
1920 -name '*.[hcS]' -type f -print | sort \
1921 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1924 find $(srctree)/* $(RCS_FIND_IGNORE) \
1925 -name '*.[hcS]' -type f -print | sort \
1926 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1929 $(Q)$(BASH) $(srctree)/scripts/$@
1932 $(PERL) $(srctree)/scripts/export_report.pl
1934 PHONY += checkstack kernelrelease kernelversion image_name
1936 # UML needs a little special treatment here. It wants to use the host
1937 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1938 # else wants $(ARCH), including people doing cross-builds, which means
1939 # that $(SUBARCH) doesn't work here.
1941 CHECKSTACK_ARCH := $(SUBARCH)
1943 CHECKSTACK_ARCH := $(ARCH)
1946 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1947 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1950 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1953 @echo $(KERNELVERSION)
1956 @echo $(KBUILD_IMAGE)
1958 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1959 cmd_rmfiles = rm -rf $(rm-files)
1961 # read saved command lines for existing targets
1962 existing-targets := $(wildcard $(sort $(targets)))
1964 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1966 endif # config-build
1968 endif # need-sub-make
1973 # Declare the contents of the PHONY variable as phony. We keep that
1974 # information in a variable so we can use it in if_changed and friends.