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 ($(KBUILD_VERBOSE),1)
94 # If the user is running make -s (silent mode), suppress echoing of
96 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
98 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
99 silence:=$(findstring s,$(firstword -$(MAKEFLAGS)))
101 silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS)))
109 export quiet Q KBUILD_VERBOSE
111 # Call a source code checker (by default, "sparse") as part of the
114 # Use 'make C=1' to enable checking of only re-compiled files.
115 # Use 'make C=2' to enable checking of *all* source files, regardless
116 # of whether they are re-compiled or not.
118 # See the file "Documentation/dev-tools/sparse.rst" for more details,
119 # including where to get the "sparse" utility.
121 ifeq ("$(origin C)", "command line")
122 KBUILD_CHECKSRC = $(C)
124 ifndef KBUILD_CHECKSRC
128 export KBUILD_CHECKSRC
130 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
131 # directory of external module to build. Setting M= takes precedence.
132 ifeq ("$(origin M)", "command line")
133 KBUILD_EXTMOD := $(M)
136 $(if $(word 2, $(KBUILD_EXTMOD)), \
137 $(error building multiple external modules is not supported))
139 # Remove trailing slashes
140 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
141 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
146 # Kbuild will save output files in the current working directory.
147 # This does not need to match to the root of the kernel source tree.
149 # For example, you can do this:
151 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
153 # If you want to save output files in a different location, there are
154 # two syntaxes to specify it.
157 # Use "make O=dir/to/store/output/files/"
159 # 2) Set KBUILD_OUTPUT
160 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
161 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
163 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
166 # Do we want to change the working directory?
167 ifeq ("$(origin O)", "command line")
168 KBUILD_OUTPUT := $(O)
171 ifneq ($(KBUILD_OUTPUT),)
172 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
173 # expand a shell special character '~'. We use a somewhat tedious way here.
174 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
175 $(if $(abs_objtree),, \
176 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
178 # $(realpath ...) resolves symlinks
179 abs_objtree := $(realpath $(abs_objtree))
181 abs_objtree := $(CURDIR)
182 endif # ifneq ($(KBUILD_OUTPUT),)
184 ifeq ($(abs_objtree),$(CURDIR))
185 # Suppress "Entering directory ..." unless we are changing the work directory.
186 MAKEFLAGS += --no-print-directory
191 this-makefile := $(lastword $(MAKEFILE_LIST))
192 abs_srctree := $(realpath $(dir $(this-makefile)))
194 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
195 $(error source directory cannot contain spaces or colons)
198 ifneq ($(abs_srctree),$(abs_objtree))
199 # Look for make include files relative to root of kernel src
201 # --included-dir is added for backward compatibility, but you should not rely on
202 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
203 MAKEFLAGS += --include-dir=$(abs_srctree)
206 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
207 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
208 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
210 # Cancel implicit rules for this Makefile.
214 export abs_srctree abs_objtree
215 export sub_make_done := 1
217 ifeq ($(need-sub-make),1)
219 PHONY += $(MAKECMDGOALS) __sub-make
221 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
224 # Invoke a second make in the output directory, passing relevant variables
226 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
228 endif # need-sub-make
229 endif # sub_make_done
231 # We process the rest of the Makefile if this is the final invocation of make
232 ifeq ($(need-sub-make),)
234 # Do not print "Entering directory ...",
235 # but we want to display it when entering to the output directory
236 # so that IDEs/editors are able to understand relative filenames.
237 MAKEFLAGS += --no-print-directory
239 ifeq ($(abs_srctree),$(abs_objtree))
240 # building in the source tree
242 building_out_of_srctree :=
244 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
245 # building in a subdirectory of the source tree
248 srctree := $(abs_srctree)
250 building_out_of_srctree := 1
253 ifneq ($(KBUILD_ABS_SRCTREE),)
254 srctree := $(abs_srctree)
260 export building_out_of_srctree srctree objtree VPATH
262 # To make sure we do not include .config for any of the *config targets
263 # catch them early, and hand them over to scripts/kconfig/Makefile
264 # It is allowed to specify more targets when calling make, including
265 # mixing *config targets and build targets.
266 # For example 'make oldconfig all'.
267 # Detect when mixed targets is specified, and make a second invocation
268 # of make so .config is not included in this case either (for *config).
270 version_h := include/generated/uapi/linux/version.h
272 clean-targets := %clean mrproper cleandocs
273 no-dot-config-targets := $(clean-targets) \
274 cscope gtags TAGS tags help% %docs check% coccicheck \
275 $(version_h) headers headers_% archheaders archscripts \
276 %asm-generic kernelversion %src-pkg dt_binding_check \
278 # Installation targets should not require compiler. Unfortunately, vdso_install
279 # is an exception where build artifacts may be updated. This must be fixed.
280 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
281 headers_install modules_install kernelrelease image_name
282 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
284 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
293 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
294 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
299 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
300 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
305 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
306 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
311 ifneq ($(KBUILD_EXTMOD),)
315 ifeq ($(KBUILD_EXTMOD),)
316 ifneq ($(filter %config,$(MAKECMDGOALS)),)
318 ifneq ($(words $(MAKECMDGOALS)),1)
324 # We cannot build single targets and the others at the same time
325 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
327 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
332 # For "make -j clean all", "make -j mrproper defconfig all", etc.
333 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
334 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
339 # install and modules_install need also be processed one by one
340 ifneq ($(filter install,$(MAKECMDGOALS)),)
341 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
347 # ===========================================================================
348 # We're called with mixed targets (*config and build targets).
349 # Handle them one by one.
351 PHONY += $(MAKECMDGOALS) __build_one_by_one
353 $(MAKECMDGOALS): __build_one_by_one
358 for i in $(MAKECMDGOALS); do \
359 $(MAKE) -f $(srctree)/Makefile $$i; \
364 include $(srctree)/scripts/Kbuild.include
366 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
367 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
368 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
369 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
371 include $(srctree)/scripts/subarch.include
373 # Cross compiling and selecting different set of gcc/bin-utils
374 # ---------------------------------------------------------------------------
376 # When performing cross compilation for other architectures ARCH shall be set
377 # to the target architecture. (See arch/* for the possibilities).
378 # ARCH can be set during invocation of make:
380 # Another way is to have ARCH set in the environment.
381 # The default ARCH is the host where make is executed.
383 # CROSS_COMPILE specify the prefix used for all executables used
384 # during compilation. Only gcc and related bin-utils executables
385 # are prefixed with $(CROSS_COMPILE).
386 # CROSS_COMPILE can be set on the command line
387 # make CROSS_COMPILE=ia64-linux-
388 # Alternatively CROSS_COMPILE can be set in the environment.
389 # Default value for CROSS_COMPILE is not to prefix executables
390 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
393 # Architecture as present in compile.h
394 UTS_MACHINE := $(ARCH)
397 # Additional ARCH settings for x86
401 ifeq ($(ARCH),x86_64)
405 # Additional ARCH settings for sparc
406 ifeq ($(ARCH),sparc32)
409 ifeq ($(ARCH),sparc64)
413 # Additional ARCH settings for parisc
414 ifeq ($(ARCH),parisc64)
418 export cross_compiling :=
419 ifneq ($(SRCARCH),$(SUBARCH))
423 KCONFIG_CONFIG ?= .config
424 export KCONFIG_CONFIG
426 # SHELL used by kbuild
429 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
430 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
431 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
440 HOSTPKG_CONFIG = pkg-config
442 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
443 -O2 -fomit-frame-pointer -std=gnu89
444 export KBUILD_USERLDFLAGS :=
446 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
447 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
448 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
449 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
451 # Make variables (CC, etc...)
458 OBJCOPY = llvm-objcopy
459 OBJDUMP = llvm-objdump
460 READELF = llvm-readelf
463 CC = $(CROSS_COMPILE)gcc
464 LD = $(CROSS_COMPILE)ld
465 AR = $(CROSS_COMPILE)ar
466 NM = $(CROSS_COMPILE)nm
467 OBJCOPY = $(CROSS_COMPILE)objcopy
468 OBJDUMP = $(CROSS_COMPILE)objdump
469 READELF = $(CROSS_COMPILE)readelf
470 STRIP = $(CROSS_COMPILE)strip
473 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
477 INSTALLKERNEL := installkernel
491 PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
493 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
494 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
503 # Use USERINCLUDE when you must reference the UAPI directories only.
505 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
506 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
507 -I$(srctree)/include/uapi \
508 -I$(objtree)/include/generated/uapi \
509 -include $(srctree)/include/linux/compiler-version.h \
510 -include $(srctree)/include/linux/kconfig.h
512 # Use LINUXINCLUDE when you must reference the include/ directory.
513 # Needed to be compatible with the O= option
515 -I$(srctree)/arch/$(SRCARCH)/include \
516 -I$(objtree)/arch/$(SRCARCH)/include/generated \
517 $(if $(building_out_of_srctree),-I$(srctree)/include) \
518 -I$(objtree)/include \
521 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
522 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
523 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
524 -Werror=implicit-function-declaration -Werror=implicit-int \
525 -Werror=return-type -Wno-format-security \
527 KBUILD_CPPFLAGS := -D__KERNEL__
528 KBUILD_AFLAGS_KERNEL :=
529 KBUILD_CFLAGS_KERNEL :=
530 KBUILD_AFLAGS_MODULE := -DMODULE
531 KBUILD_CFLAGS_MODULE := -DMODULE
532 KBUILD_LDFLAGS_MODULE :=
536 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
537 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
538 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
539 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
540 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
542 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
543 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
544 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
545 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
546 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
549 # Files to ignore in find ... statements
551 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
552 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
554 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
555 --exclude CVS --exclude .pc --exclude .hg --exclude .git
557 # ===========================================================================
558 # Rules shared between *config targets and build targets
560 # Basic helpers built in scripts/basic/
561 PHONY += scripts_basic
563 $(Q)$(MAKE) $(build)=scripts/basic
565 PHONY += outputmakefile
566 ifdef building_out_of_srctree
567 # Before starting out-of-tree build, make sure the source tree is clean.
568 # outputmakefile generates a Makefile in the output directory, if using a
569 # separate output directory. This allows convenient use of make in the
571 # At the same time when output Makefile generated, generate .gitignore to
572 # ignore whole output directory
574 quiet_cmd_makefile = GEN Makefile
576 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
577 echo "include $(srctree)/Makefile"; \
581 $(Q)if [ -f $(srctree)/.config -o \
582 -d $(srctree)/include/config -o \
583 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
585 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
586 echo >&2 "*** in $(abs_srctree)";\
590 $(Q)ln -fsn $(srctree) source
592 $(Q)test -e .gitignore || \
593 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
596 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
597 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
598 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
599 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
600 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
602 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
603 include $(srctree)/scripts/Makefile.clang
606 # Include this also for config targets because some architectures need
607 # cc-cross-prefix to determine CROSS_COMPILE.
609 include $(srctree)/scripts/Makefile.compiler
613 # ===========================================================================
614 # *config targets only - make sure prerequisites are updated, and descend
615 # in scripts/kconfig to make the *config target
617 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
618 # KBUILD_DEFCONFIG may point out an alternative default configuration
619 # used for 'make defconfig'
620 include $(srctree)/arch/$(SRCARCH)/Makefile
621 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
623 config: outputmakefile scripts_basic FORCE
624 $(Q)$(MAKE) $(build)=scripts/kconfig $@
626 %config: outputmakefile scripts_basic FORCE
627 $(Q)$(MAKE) $(build)=scripts/kconfig $@
630 # ===========================================================================
631 # Build targets only - this includes vmlinux, arch specific targets, clean
632 # targets and others. In general all targets except *config targets.
634 # If building an external module we do not care about the all: rule
635 # but instead __all depend on modules
637 ifeq ($(KBUILD_EXTMOD),)
643 # Decide whether to build built-in, modular, or both.
644 # Normally, just do built-in.
649 # If we have only "make modules", don't compile built-in objects.
650 ifeq ($(MAKECMDGOALS),modules)
654 # If we have "make <whatever> modules", compile modules
655 # in addition to whatever we do anyway.
656 # Just "make" or "make all" shall build modules as well
658 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
662 ifeq ($(MAKECMDGOALS),)
666 export KBUILD_MODULES KBUILD_BUILTIN
669 include include/config/auto.conf
672 ifeq ($(KBUILD_EXTMOD),)
673 # Objects we will link into vmlinux / subdirs we need to visit
674 core-y := init/ usr/ arch/$(SRCARCH)/
675 drivers-y := drivers/ sound/
676 drivers-$(CONFIG_SAMPLES) += samples/
677 drivers-$(CONFIG_NET) += net/
680 endif # KBUILD_EXTMOD
682 # The all: target is the default when no target is given on the
684 # This allow a user to issue only 'make' to build a kernel including modules
685 # Defaults to vmlinux, but the arch makefile usually adds further targets
688 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
689 ifdef CONFIG_CC_IS_GCC
690 CFLAGS_GCOV += -fno-tree-loop-im
694 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
695 ifdef CONFIG_FUNCTION_TRACER
696 CC_FLAGS_FTRACE := -pg
699 ifdef CONFIG_CC_IS_GCC
700 RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
701 RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch-cs-prefix)
702 RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register)
704 ifdef CONFIG_CC_IS_CLANG
705 RETPOLINE_CFLAGS := -mretpoline-external-thunk
706 RETPOLINE_VDSO_CFLAGS := -mretpoline
710 RETHUNK_CFLAGS := -mfunction-return=thunk-extern
711 RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS)
714 export RETPOLINE_CFLAGS
715 export RETPOLINE_VDSO_CFLAGS
717 include $(srctree)/arch/$(SRCARCH)/Makefile
720 ifdef may-sync-config
721 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
722 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
723 # because some architectures define CROSS_COMPILE there.
724 include include/config/auto.conf.cmd
728 @echo >&2 '*** Configuration file "$@" not found!'
730 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
731 @echo >&2 '*** "make menuconfig" or "make xconfig").'
735 # The actual configuration files used during the build are stored in
736 # include/generated/ and include/config/. Update them if .config is newer than
737 # include/config/auto.conf (which mirrors .config).
739 # This exploits the 'multi-target pattern rule' trick.
740 # The syncconfig should be executed only once to make all the targets.
741 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
743 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
744 # so you cannot notice that Kconfig is waiting for the user input.
745 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
746 $(Q)$(kecho) " SYNC $@"
747 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
748 else # !may-sync-config
749 # External modules and some install targets need include/generated/autoconf.h
750 # and include/config/auto.conf but do not care if they are up-to-date.
751 # Use auto.conf to trigger the test
752 PHONY += include/config/auto.conf
754 include/config/auto.conf:
755 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
757 echo >&2 " ERROR: Kernel configuration is invalid."; \
758 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
759 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
763 endif # may-sync-config
766 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
767 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
768 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
769 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
770 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
772 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
774 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
776 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
780 # Tell gcc to never replace conditional load with a non-conditional one
781 ifdef CONFIG_CC_IS_GCC
782 # gcc-10 renamed --param=allow-store-data-races=0 to
783 # -fno-allow-store-data-races.
784 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
785 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
788 ifdef CONFIG_READABLE_ASM
789 # Disable optimizations that make assembler listings hard to read.
790 # reorder blocks reorders the control in the function
791 # ipa clone creates specialized cloned functions
792 # partial inlining inlines only parts of functions
793 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
796 ifneq ($(CONFIG_FRAME_WARN),0)
797 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
800 stackp-flags-y := -fno-stack-protector
801 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
802 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
804 KBUILD_CFLAGS += $(stackp-flags-y)
806 KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror -Wno-error=format-extra-args -Wno-error=comment -Wno-error=unused-function -Wno-error=unused-variable
807 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y)
809 ifdef CONFIG_CC_IS_CLANG
810 KBUILD_CPPFLAGS += -Qunused-arguments
811 # The kernel builds with '-std=gnu89' so use of GNU extensions is acceptable.
812 KBUILD_CFLAGS += -Wno-gnu
813 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
814 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
815 # See modpost pattern 2
816 KBUILD_CFLAGS += -mno-global-merge
819 # Warn about unmarked fall-throughs in switch statement.
820 # Disabled for clang while comment to attribute conversion happens and
821 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
822 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=5,)
823 # gcc inanely warns about local variables called 'main'
824 KBUILD_CFLAGS += -Wno-main
827 # These warnings generated too much noise in a regular build.
828 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
829 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
830 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
832 # These result in bogus false positives
833 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
835 ifdef CONFIG_FRAME_POINTER
836 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
838 # Some targets (ARM with Thumb2, for example), can't be built with frame
839 # pointers. For those, we don't have FUNCTION_TRACER automatically
840 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
841 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
842 # -fomit-frame-pointer with FUNCTION_TRACER.
843 ifndef CONFIG_FUNCTION_TRACER
844 KBUILD_CFLAGS += -fomit-frame-pointer
848 # Initialize all stack variables with a 0xAA pattern.
849 ifdef CONFIG_INIT_STACK_ALL_PATTERN
850 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
853 # Initialize all stack variables with a zero value.
854 ifdef CONFIG_INIT_STACK_ALL_ZERO
855 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
856 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
857 # https://github.com/llvm/llvm-project/issues/44842
858 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
862 # While VLAs have been removed, GCC produces unreachable stack probes
863 # for the randomize_kstack_offset feature. Disable it for all compilers.
864 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
866 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
867 ifdef CONFIG_ZERO_CALL_USED_REGS
868 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
873 ifdef CONFIG_DEBUG_INFO
875 ifdef CONFIG_DEBUG_INFO_SPLIT
876 DEBUG_CFLAGS += -gsplit-dwarf
881 ifdef CONFIG_AS_IS_LLVM
884 KBUILD_AFLAGS += -Wa,-gdwarf-2
887 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
888 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
889 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
890 DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
891 KBUILD_AFLAGS += -gdwarf-$(dwarf-version-y)
894 ifdef CONFIG_DEBUG_INFO_REDUCED
895 DEBUG_CFLAGS += -fno-var-tracking
896 ifdef CONFIG_CC_IS_GCC
897 DEBUG_CFLAGS += -femit-struct-debug-baseonly
901 ifdef CONFIG_DEBUG_INFO_COMPRESSED
902 DEBUG_CFLAGS += -gz=zlib
903 KBUILD_AFLAGS += -gz=zlib
904 KBUILD_LDFLAGS += --compress-debug-sections=zlib
907 endif # CONFIG_DEBUG_INFO
909 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
912 ifdef CONFIG_FUNCTION_TRACER
913 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
914 CC_FLAGS_FTRACE += -mrecord-mcount
915 ifdef CONFIG_HAVE_NOP_MCOUNT
916 ifeq ($(call cc-option-yn, -mnop-mcount),y)
917 CC_FLAGS_FTRACE += -mnop-mcount
918 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
922 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
923 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
925 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
926 ifdef CONFIG_HAVE_C_RECORDMCOUNT
927 BUILD_C_RECORDMCOUNT := y
928 export BUILD_C_RECORDMCOUNT
931 ifdef CONFIG_HAVE_FENTRY
932 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
933 ifeq ($(call cc-option-yn, -mfentry),y)
934 CC_FLAGS_FTRACE += -mfentry
935 CC_FLAGS_USING += -DCC_USING_FENTRY
938 export CC_FLAGS_FTRACE
939 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
940 KBUILD_AFLAGS += $(CC_FLAGS_USING)
943 # We trigger additional mismatches with less inlining
944 ifdef CONFIG_DEBUG_SECTION_MISMATCH
945 KBUILD_CFLAGS += -fno-inline-functions-called-once
948 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
949 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
950 LDFLAGS_vmlinux += --gc-sections
953 ifdef CONFIG_SHADOW_CALL_STACK
954 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
955 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
959 ifdef CONFIG_LTO_CLANG
960 ifdef CONFIG_LTO_CLANG_THIN
961 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
962 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
964 CC_FLAGS_LTO := -flto
966 CC_FLAGS_LTO += -fvisibility=hidden
968 # Limit inlining across translation units to reduce binary size
969 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
971 # Check for frame size exceeding threshold during prolog/epilog insertion
972 # when using lld < 13.0.0.
973 ifneq ($(CONFIG_FRAME_WARN),0)
974 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
975 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
981 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
982 KBUILD_AFLAGS += -fno-lto
986 ifdef CONFIG_CFI_CLANG
987 CC_FLAGS_CFI := -fsanitize=cfi \
988 -fsanitize-cfi-cross-dso \
989 -fno-sanitize-cfi-canonical-jump-tables \
990 -fno-sanitize-trap=cfi \
991 -fno-sanitize-blacklist
993 ifdef CONFIG_CFI_PERMISSIVE
994 CC_FLAGS_CFI += -fsanitize-recover=cfi
997 # If LTO flags are filtered out, we must also filter out CFI.
998 CC_FLAGS_LTO += $(CC_FLAGS_CFI)
999 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
1003 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
1004 KBUILD_CFLAGS += -falign-functions=64
1007 # arch Makefile may override CC so keep this after arch Makefile is included
1008 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
1010 # warn about C99 declaration after statement
1011 KBUILD_CFLAGS += -Wdeclaration-after-statement
1013 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1014 KBUILD_CFLAGS += -Wvla
1016 # disable pointer signed / unsigned warnings in gcc 4.0
1017 KBUILD_CFLAGS += -Wno-pointer-sign
1019 # disable stringop warnings in gcc 8+
1020 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
1022 # We'll want to enable this eventually, but it's not going away for 5.7 at least
1023 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
1024 KBUILD_CFLAGS += -Wno-array-bounds
1025 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
1027 # Another good warning that we'll want to enable eventually
1028 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1030 # Enabled with W=2, disabled by default as noisy
1031 ifdef CONFIG_CC_IS_GCC
1032 KBUILD_CFLAGS += -Wno-maybe-uninitialized
1035 ifdef CONFIG_CC_IS_GCC
1036 # The allocators already balk at large sizes, so silence the compiler
1037 # warnings for bounds checks involving those possible values. While
1038 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
1039 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
1040 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1041 # doesn't work (as it is documented to), silently resolving to "0" prior to
1042 # version 9.1 (and producing an error more recently). Numeric values larger
1043 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1044 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1045 # choice, we must perform a versioned check to disable this warning.
1046 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
1047 KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than)
1050 # disable invalid "can't wrap" optimizations for signed / pointers
1051 KBUILD_CFLAGS += -fno-strict-overflow
1053 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1054 KBUILD_CFLAGS += -fno-stack-check
1056 # conserve stack if available
1057 ifdef CONFIG_CC_IS_GCC
1058 KBUILD_CFLAGS += -fconserve-stack
1061 # Prohibit date/time macros, which would make the build non-deterministic
1062 KBUILD_CFLAGS += -Werror=date-time
1064 # enforce correct pointer usage
1065 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
1067 # Require designated initializers for all marked structures
1068 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1070 # change __FILE__ to the relative path from the srctree
1071 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1073 # include additional Makefiles when needed
1074 include-y := scripts/Makefile.extrawarn
1075 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1076 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1077 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1078 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1079 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1081 include $(addprefix $(srctree)/, $(include-y))
1083 # scripts/Makefile.gcc-plugins is intentionally included last.
1084 # Do not add $(call cc-option,...) below this line. When you build the kernel
1085 # from the clean source tree, the GCC plugins do not exist at this point.
1087 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1088 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1089 KBUILD_AFLAGS += $(KAFLAGS)
1090 KBUILD_CFLAGS += $(KCFLAGS)
1092 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1093 LDFLAGS_vmlinux += --build-id=sha1
1095 KBUILD_LDFLAGS += -z noexecstack
1096 ifeq ($(CONFIG_LD_IS_BFD),y)
1097 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
1100 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1101 LDFLAGS_vmlinux += $(call ld-option, -X,)
1104 ifeq ($(CONFIG_RELR),y)
1105 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1108 # We never want expected sections to be placed heuristically by the
1109 # linker. All sections should be explicitly named in the linker script.
1110 ifdef CONFIG_LD_ORPHAN_WARN
1111 LDFLAGS_vmlinux += --orphan-handling=warn
1114 # Align the bit size of userspace programs with the kernel
1115 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1116 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1118 # make the checker run with the right architecture
1119 CHECKFLAGS += --arch=$(ARCH)
1121 # insure the checker run with the right endianness
1122 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1124 # the checker needs the correct machine size
1125 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1127 # Default kernel image to build when no specific target is given.
1128 # KBUILD_IMAGE may be overruled on the command line or
1129 # set in the environment
1130 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1131 # this default value
1132 export KBUILD_IMAGE ?= vmlinux
1135 # INSTALL_PATH specifies where to place the updated kernel and system map
1136 # images. Default is /boot, but you can set it to other values
1137 export INSTALL_PATH ?= /boot
1140 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1141 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1142 # an argument if needed. Otherwise it defaults to the kernel install path
1144 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1147 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1148 # relocations required by build roots. This is not defined in the
1149 # makefile but the argument can be passed to make if needed.
1152 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1157 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1158 export MODORDER := $(extmod_prefix)modules.order
1159 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1161 ifeq ($(KBUILD_EXTMOD),)
1162 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/
1163 core-$(CONFIG_BLOCK) += block/
1164 core-$(CONFIG_IO_URING) += io_uring/
1166 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1167 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1168 $(libs-y) $(libs-m)))
1170 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1171 $(patsubst %/,%,$(filter %/, $(core-) \
1172 $(drivers-) $(libs-))))
1174 build-dirs := $(vmlinux-dirs)
1175 clean-dirs := $(vmlinux-alldirs)
1177 subdir-modorder := $(addsuffix /modules.order, $(build-dirs))
1179 # Externally visible symbols (used by link-vmlinux.sh)
1180 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1181 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1182 ifdef CONFIG_MODULES
1183 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1184 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1186 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1188 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1190 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1191 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1192 # used by scripts/Makefile.package
1193 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1195 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1197 # Recurse until adjust_autoksyms.sh is satisfied
1198 PHONY += autoksyms_recursive
1199 ifdef CONFIG_TRIM_UNUSED_KSYMS
1200 # For the kernel to actually contain only the needed exported symbols,
1201 # we have to build modules as well to determine what those symbols are.
1202 # (this can be evaluated only once include/config/auto.conf has been included)
1205 autoksyms_recursive: descend modules.order
1206 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1207 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1210 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1212 quiet_cmd_autoksyms_h = GEN $@
1213 cmd_autoksyms_h = mkdir -p $(dir $@); \
1214 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1217 $(call cmd,autoksyms_h)
1219 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1221 # Final link of vmlinux with optional arch pass after final link
1222 cmd_link-vmlinux = \
1223 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1224 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1226 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1227 +$(call if_changed_dep,link-vmlinux)
1231 # The actual objects are generated when descending,
1232 # make sure no implicit rule kicks in
1233 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1235 filechk_kernel.release = \
1236 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1238 # Store (new) KERNELRELEASE string in include/config/kernel.release
1239 include/config/kernel.release: FORCE
1240 $(call filechk,kernel.release)
1242 # Additional helpers built in scripts/
1243 # Carefully list dependencies so we do not try to build scripts twice
1246 scripts: scripts_basic scripts_dtc
1247 $(Q)$(MAKE) $(build)=$(@)
1249 # Things we need to do before we recursively start building the kernel
1250 # or the modules are listed in "prepare".
1251 # A multi level approach is used. prepareN is processed before prepareN-1.
1252 # archprepare is used in arch Makefiles and when processed asm symlink,
1253 # version.h and scripts_basic is processed / created.
1255 PHONY += prepare archprepare
1257 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1258 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1259 include/generated/autoconf.h remove-stale-files
1261 prepare0: archprepare
1262 $(Q)$(MAKE) $(build)=scripts/mod
1263 $(Q)$(MAKE) $(build)=.
1265 # All the preparing..
1268 PHONY += remove-stale-files
1270 $(Q)$(srctree)/scripts/remove-stale-files
1272 # Support for using generic headers in asm-generic
1273 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1275 PHONY += asm-generic uapi-asm-generic
1276 asm-generic: uapi-asm-generic
1277 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1278 generic=include/asm-generic
1280 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1281 generic=include/uapi/asm-generic
1283 # Generate some files
1284 # ---------------------------------------------------------------------------
1286 # KERNELRELEASE can change from a few different places, meaning version.h
1287 # needs to be updated, so this check is forced on all builds
1290 define filechk_utsrelease.h
1291 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1292 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1295 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1298 define filechk_version.h
1299 if [ $(SUBLEVEL) -gt 255 ]; then \
1300 echo \#define LINUX_VERSION_CODE $(shell \
1301 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1303 echo \#define LINUX_VERSION_CODE $(shell \
1304 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1306 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1307 ((c) > 255 ? 255 : (c)))'; \
1308 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1309 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1310 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1313 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1314 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1316 $(call filechk,version.h)
1318 include/generated/utsrelease.h: include/config/kernel.release FORCE
1319 $(call filechk,utsrelease.h)
1323 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1324 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1326 # ---------------------------------------------------------------------------
1329 #Default location for installed headers
1330 export INSTALL_HDR_PATH = $(objtree)/usr
1332 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1333 cmd_headers_install = \
1334 mkdir -p $(INSTALL_HDR_PATH); \
1335 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1336 usr/include $(INSTALL_HDR_PATH)
1338 PHONY += headers_install
1339 headers_install: headers
1340 $(call cmd,headers_install)
1342 PHONY += archheaders archscripts
1344 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1347 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1348 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1349 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1350 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1352 # Deprecated. It is no-op now.
1353 PHONY += headers_check
1355 @echo >&2 "=================== WARNING ==================="
1356 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op,"
1357 @echo >&2 "and will be removed after Linux 5.15 release."
1358 @echo >&2 "Please remove headers_check from your scripts."
1359 @echo >&2 "==============================================="
1361 ifdef CONFIG_HEADERS_INSTALL
1365 PHONY += scripts_unifdef
1366 scripts_unifdef: scripts_basic
1367 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1369 # ---------------------------------------------------------------------------
1372 # Many distributions have the custom install script, /sbin/installkernel.
1373 # If DKMS is installed, 'make install' will eventually recuses back
1374 # to the this Makefile to build and install external modules.
1375 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1377 install: sub_make_done :=
1379 # ---------------------------------------------------------------------------
1382 ifdef CONFIG_STACK_VALIDATION
1383 prepare: tools/objtool
1387 ifdef CONFIG_DEBUG_INFO_BTF
1388 prepare: tools/bpf/resolve_btfids
1392 PHONY += resolve_btfids_clean
1394 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1396 # tools/bpf/resolve_btfids directory might not exist
1397 # in output directory, skip its clean in that case
1398 resolve_btfids_clean:
1399 ifneq ($(wildcard $(resolve_btfids_O)),)
1400 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1403 # Clear a bunch of variables before executing the submake
1404 ifeq ($(quiet),silent_)
1409 $(Q)mkdir -p $(objtree)/tools
1410 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1413 $(Q)mkdir -p $(objtree)/tools
1414 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1416 # ---------------------------------------------------------------------------
1421 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1424 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1426 PHONY += kselftest-merge
1428 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1429 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1430 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1431 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1433 # ---------------------------------------------------------------------------
1436 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1437 dtstree := arch/$(SRCARCH)/boot/dts
1442 %.dtb: include/config/kernel.release scripts_dtc
1443 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1445 %.dtbo: include/config/kernel.release scripts_dtc
1446 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1448 PHONY += dtbs dtbs_install dtbs_check
1449 dtbs: include/config/kernel.release scripts_dtc
1450 $(Q)$(MAKE) $(build)=$(dtstree)
1452 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1454 dtbs: dt_binding_check
1460 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1462 ifdef CONFIG_OF_EARLY_FLATTREE
1468 PHONY += scripts_dtc
1469 scripts_dtc: scripts_basic
1470 $(Q)$(MAKE) $(build)=scripts/dtc
1472 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1473 export CHECK_DT_BINDING=y
1476 PHONY += dt_binding_check
1477 dt_binding_check: scripts_dtc
1478 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1480 # ---------------------------------------------------------------------------
1483 ifdef CONFIG_MODULES
1485 # By default, build modules as well
1489 # When we're building modules with modversions, we need to consider
1490 # the built-in objects during the descend as well, in order to
1491 # make sure the checksums are up to date before we record them.
1492 ifdef CONFIG_MODVERSIONS
1498 # A module can be listed more than once in obj-m resulting in
1499 # duplicate lines in modules.order files. Those are removed
1500 # using awk while concatenating to the final file.
1503 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1505 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1507 modules.order: $(subdir-modorder) FORCE
1508 $(call if_changed,modules_order)
1510 targets += modules.order
1512 # Target to prepare building external modules
1513 PHONY += modules_prepare
1514 modules_prepare: prepare
1515 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1517 export modules_sign_only :=
1519 ifeq ($(CONFIG_MODULE_SIG),y)
1520 PHONY += modules_sign
1521 modules_sign: modules_install
1524 # modules_sign is a subset of modules_install.
1525 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1526 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1527 modules_sign_only := y
1532 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1533 modinst_pre := __modinst_pre
1536 modules_install: $(modinst_pre)
1537 PHONY += __modinst_pre
1539 @rm -rf $(MODLIB)/kernel
1540 @rm -f $(MODLIB)/source
1541 @mkdir -p $(MODLIB)/kernel
1542 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1543 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1544 rm -f $(MODLIB)/build ; \
1545 ln -s $(CURDIR) $(MODLIB)/build ; \
1547 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1548 @cp -f modules.builtin $(MODLIB)/
1549 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1551 endif # CONFIG_MODULES
1554 # Cleaning is done on three levels.
1555 # make clean Delete most generated files
1556 # Leave enough to build external modules
1557 # make mrproper Delete the current configuration, and all generated files
1558 # make distclean Remove editor backup files, patch leftover files and the like
1560 # Directories & files removed with 'make clean'
1561 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1562 modules.builtin modules.builtin.modinfo modules.nsdeps \
1563 compile_commands.json .thinlto-cache
1565 # Directories & files removed with 'make mrproper'
1566 MRPROPER_FILES += include/config include/generated \
1567 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1568 debian snap tar-install \
1569 .config .config.old .version \
1571 certs/signing_key.pem certs/signing_key.x509 \
1576 # clean - Delete most, but leave enough to build external modules
1578 clean: rm-files := $(CLEAN_FILES)
1580 PHONY += archclean vmlinuxclean
1583 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1584 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1586 clean: archclean vmlinuxclean resolve_btfids_clean
1588 # mrproper - Delete all generated files, including .config
1590 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1591 mrproper-dirs := $(addprefix _mrproper_,scripts)
1593 PHONY += $(mrproper-dirs) mrproper
1595 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1597 mrproper: clean $(mrproper-dirs)
1605 @find . $(RCS_FIND_IGNORE) \
1606 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1607 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1608 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1609 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1610 -type f -print | xargs rm -f
1613 # Packaging of the kernel to various formats
1614 # ---------------------------------------------------------------------------
1617 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1618 %pkg: include/config/kernel.release FORCE
1619 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1621 # Brief documentation of the typical targets used
1622 # ---------------------------------------------------------------------------
1624 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1625 boards := $(sort $(notdir $(boards)))
1626 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1627 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1631 @echo 'Cleaning targets:'
1632 @echo ' clean - Remove most generated files but keep the config and'
1633 @echo ' enough build support to build external modules'
1634 @echo ' mrproper - Remove all generated files + config + various backup files'
1635 @echo ' distclean - mrproper + remove editor backup and patch files'
1637 @echo 'Configuration targets:'
1638 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1640 @echo 'Other generic targets:'
1641 @echo ' all - Build all targets marked with [*]'
1642 @echo '* vmlinux - Build the bare kernel'
1643 @echo '* modules - Build all modules'
1644 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1645 @echo ' dir/ - Build all files in dir and below'
1646 @echo ' dir/file.[ois] - Build specified target only'
1647 @echo ' dir/file.ll - Build the LLVM assembly file'
1648 @echo ' (requires compiler support for LLVM assembly generation)'
1649 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1650 @echo ' (requires a recent binutils and recent build (System.map))'
1651 @echo ' dir/file.ko - Build module including final link'
1652 @echo ' modules_prepare - Set up for building external modules'
1653 @echo ' tags/TAGS - Generate tags file for editors'
1654 @echo ' cscope - Generate cscope index'
1655 @echo ' gtags - Generate GNU GLOBAL index'
1656 @echo ' kernelrelease - Output the release version string (use with make -s)'
1657 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1658 @echo ' image_name - Output the image name (use with make -s)'
1659 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1660 echo ' (default: $(INSTALL_HDR_PATH))'; \
1662 @echo 'Static analysers:'
1663 @echo ' checkstack - Generate a list of stack hogs'
1664 @echo ' versioncheck - Sanity check on version.h usage'
1665 @echo ' includecheck - Check for duplicate included header files'
1666 @echo ' export_report - List the usages of all exported symbols'
1667 @echo ' headerdep - Detect inclusion cycles in headers'
1668 @echo ' coccicheck - Check with Coccinelle'
1669 @echo ' clang-analyzer - Check with clang static analyzer'
1670 @echo ' clang-tidy - Check with clang-tidy'
1673 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1675 @echo 'Kernel selftest:'
1676 @echo ' kselftest - Build and run kernel selftest'
1677 @echo ' Build, install, and boot kernel before'
1678 @echo ' running kselftest on it'
1679 @echo ' Run as root for full coverage'
1680 @echo ' kselftest-all - Build kernel selftest'
1681 @echo ' kselftest-install - Build and install kernel selftest'
1682 @echo ' kselftest-clean - Remove all generated kselftest files'
1683 @echo ' kselftest-merge - Merge all the config dependencies of'
1684 @echo ' kselftest to existing .config.'
1687 echo 'Devicetree:'; \
1688 echo '* dtbs - Build device tree blobs for enabled boards'; \
1689 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1690 echo ' dt_binding_check - Validate device tree binding documents'; \
1691 echo ' dtbs_check - Validate device tree source files';\
1694 @echo 'Userspace tools targets:'
1695 @echo ' use "make tools/help"'
1696 @echo ' or "cd tools; make help"'
1698 @echo 'Kernel packaging:'
1699 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1701 @echo 'Documentation targets:'
1702 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1704 @echo 'Architecture specific targets ($(SRCARCH)):'
1705 @$(if $(archhelp),$(archhelp),\
1706 echo ' No architecture specific help defined for $(SRCARCH)')
1709 $(foreach b, $(boards), \
1710 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1712 @$(if $(board-dirs), \
1713 $(foreach b, $(board-dirs), \
1714 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1715 printf " %-16s - Show all of the above\\n" help-boards; \
1718 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1719 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1720 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1721 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1722 @echo ' (sparse by default)'
1723 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1724 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1725 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1726 @echo ' 1: warnings which may be relevant and do not occur too often'
1727 @echo ' 2: warnings which occur quite often but may still be relevant'
1728 @echo ' 3: more obscure warnings, can most likely be ignored'
1729 @echo ' Multiple levels can be combined with W=12 or W=123'
1731 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1732 @echo 'For further info see the ./README file'
1735 help-board-dirs := $(addprefix help-,$(board-dirs))
1737 help-boards: $(help-board-dirs)
1739 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1741 $(help-board-dirs): help-%:
1742 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1743 @$(if $(boards-per-dir), \
1744 $(foreach b, $(boards-per-dir), \
1745 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1749 # Documentation targets
1750 # ---------------------------------------------------------------------------
1751 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1752 linkcheckdocs dochelp refcheckdocs
1753 PHONY += $(DOC_TARGETS)
1755 $(Q)$(MAKE) $(build)=Documentation $@
1758 # ---------------------------------------------------------------------------
1760 PHONY += scripts_gdb
1761 scripts_gdb: prepare0
1762 $(Q)$(MAKE) $(build)=scripts/gdb
1763 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1765 ifdef CONFIG_GDB_SCRIPTS
1769 else # KBUILD_EXTMOD
1772 # External module support.
1773 # When building external modules the kernel used as basis is considered
1774 # read-only, and no consistency checks are made and the make
1775 # system is not used on the basis kernel. If updates are required
1776 # in the basis kernel ordinary make commands (without M=...) must be used.
1778 # We are always building only modules.
1782 build-dirs := $(KBUILD_EXTMOD)
1783 $(MODORDER): descend
1786 compile_commands.json: $(extmod_prefix)compile_commands.json
1787 PHONY += compile_commands.json
1789 clean-dirs := $(KBUILD_EXTMOD)
1790 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1791 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1794 # now expand this into a simple variable to reduce the cost of shell evaluations
1795 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1797 @if [ "$(CC_VERSION_TEXT)" != $(CONFIG_CC_VERSION_TEXT) ]; then \
1798 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1799 echo >&2 " The kernel was built by: "$(CONFIG_CC_VERSION_TEXT); \
1800 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1805 @echo ' Building external modules.'
1806 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1808 @echo ' modules - default target, build the module(s)'
1809 @echo ' modules_install - install the module'
1810 @echo ' clean - remove generated files in module directory only'
1813 # no-op for external module builds
1814 PHONY += modules_prepare
1816 endif # KBUILD_EXTMOD
1818 # ---------------------------------------------------------------------------
1821 PHONY += modules modules_install
1823 ifdef CONFIG_MODULES
1825 modules: modules_check
1826 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1828 PHONY += modules_check
1829 modules_check: $(MODORDER)
1830 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1832 quiet_cmd_depmod = DEPMOD $(MODLIB)
1833 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1837 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1838 ifndef modules_sign_only
1842 else # CONFIG_MODULES
1844 # Modules not configured
1845 # ---------------------------------------------------------------------------
1847 modules modules_install:
1849 @echo >&2 '*** The present kernel configuration has modules disabled.'
1850 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1851 @echo >&2 '*** to enable CONFIG_MODULES.'
1857 endif # CONFIG_MODULES
1860 # ---------------------------------------------------------------------------
1861 # To build individual files in subdirectories, you can do like this:
1863 # make foo/bar/baz.s
1865 # The supported suffixes for single-target are listed in 'single-targets'
1867 # To build only under specific subdirectories, you can do like this:
1873 # .ko is special because modpost is needed
1874 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1875 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1877 $(single-ko): single_modpost
1879 $(single-no-ko): descend
1882 # Remove MODORDER when done because it is not the real one.
1883 PHONY += single_modpost
1884 single_modpost: $(single-no-ko) modules_prepare
1885 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
1886 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1887 $(Q)rm -f $(MODORDER)
1889 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
1891 # trim unrelated directories
1892 build-dirs := $(foreach d, $(build-dirs), \
1893 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1899 # Handle descending into subdirectories listed in $(build-dirs)
1900 # Preset locale variables to speed up the build process. Limit locale
1901 # tweaks to this spot to avoid wrong language settings when running
1902 # make menuconfig etc.
1903 # Error messages still appears in the original language
1904 PHONY += descend $(build-dirs)
1905 descend: $(build-dirs)
1906 $(build-dirs): prepare
1907 $(Q)$(MAKE) $(build)=$@ \
1908 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1909 need-builtin=1 need-modorder=1
1911 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1912 PHONY += $(clean-dirs) clean
1914 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1916 clean: $(clean-dirs)
1918 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1919 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1921 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1922 -o -name '*.dwo' -o -name '*.lst' \
1923 -o -name '*.su' -o -name '*.mod' \
1924 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1925 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1926 -o -name '*.asn1.[ch]' \
1927 -o -name '*.symtypes' -o -name 'modules.order' \
1928 -o -name '.tmp_*.o.*' \
1929 -o -name '*.c.[012]*.*' \
1932 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1934 # Generate tags for editors
1935 # ---------------------------------------------------------------------------
1936 quiet_cmd_tags = GEN $@
1937 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1939 tags TAGS cscope gtags: FORCE
1942 # Script to generate missing namespace dependencies
1943 # ---------------------------------------------------------------------------
1946 nsdeps: export KBUILD_NSDEPS=1
1948 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1951 # ---------------------------------------------------------------------------
1953 quiet_cmd_gen_compile_commands = GEN $@
1954 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1956 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1957 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1958 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1959 $(call if_changed,gen_compile_commands)
1961 targets += $(extmod_prefix)compile_commands.json
1963 PHONY += clang-tidy clang-analyzer
1965 ifdef CONFIG_CC_IS_CLANG
1966 quiet_cmd_clang_tools = CHECK $<
1967 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1969 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1970 $(call cmd,clang_tools)
1972 clang-tidy clang-analyzer:
1973 @echo "$@ requires CC=clang" >&2
1977 # Scripts to check various things for consistency
1978 # ---------------------------------------------------------------------------
1980 PHONY += includecheck versioncheck coccicheck export_report
1983 find $(srctree)/* $(RCS_FIND_IGNORE) \
1984 -name '*.[hcS]' -type f -print | sort \
1985 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1988 find $(srctree)/* $(RCS_FIND_IGNORE) \
1989 -name '*.[hcS]' -type f -print | sort \
1990 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1993 $(Q)$(BASH) $(srctree)/scripts/$@
1996 $(PERL) $(srctree)/scripts/export_report.pl
1998 PHONY += checkstack kernelrelease kernelversion image_name
2000 # UML needs a little special treatment here. It wants to use the host
2001 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2002 # else wants $(ARCH), including people doing cross-builds, which means
2003 # that $(SUBARCH) doesn't work here.
2005 CHECKSTACK_ARCH := $(SUBARCH)
2007 CHECKSTACK_ARCH := $(ARCH)
2010 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2011 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2014 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
2017 @echo $(KERNELVERSION)
2020 @echo $(KBUILD_IMAGE)
2022 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2023 cmd_rmfiles = rm -rf $(rm-files)
2025 # read saved command lines for existing targets
2026 existing-targets := $(wildcard $(sort $(targets)))
2028 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2030 endif # config-build
2032 endif # need-sub-make
2037 # Declare the contents of the PHONY variable as phony. We keep that
2038 # information in a variable so we can use it in if_changed and friends.