1 # SPDX-License-Identifier: GPL-2.0
6 NAME = Opossums on Parade
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),$(abs_objtree))
192 # Look for make include files relative to root of kernel src
194 # This does not become effective immediately because MAKEFLAGS is re-parsed
195 # once after the Makefile is read. We need to invoke sub-make.
196 MAKEFLAGS += --include-dir=$(abs_srctree)
200 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
201 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
202 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
204 # Cancel implicit rules for this Makefile.
208 export abs_srctree abs_objtree
209 export sub_make_done := 1
211 ifeq ($(need-sub-make),1)
213 PHONY += $(MAKECMDGOALS) __sub-make
215 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
218 # Invoke a second make in the output directory, passing relevant variables
220 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
222 endif # need-sub-make
223 endif # sub_make_done
225 # We process the rest of the Makefile if this is the final invocation of make
226 ifeq ($(need-sub-make),)
228 # Do not print "Entering directory ...",
229 # but we want to display it when entering to the output directory
230 # so that IDEs/editors are able to understand relative filenames.
231 MAKEFLAGS += --no-print-directory
233 ifeq ($(abs_srctree),$(abs_objtree))
234 # building in the source tree
236 building_out_of_srctree :=
238 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
239 # building in a subdirectory of the source tree
242 srctree := $(abs_srctree)
244 building_out_of_srctree := 1
247 ifneq ($(KBUILD_ABS_SRCTREE),)
248 srctree := $(abs_srctree)
254 export building_out_of_srctree srctree objtree VPATH
256 # To make sure we do not include .config for any of the *config targets
257 # catch them early, and hand them over to scripts/kconfig/Makefile
258 # It is allowed to specify more targets when calling make, including
259 # mixing *config targets and build targets.
260 # For example 'make oldconfig all'.
261 # Detect when mixed targets is specified, and make a second invocation
262 # of make so .config is not included in this case either (for *config).
264 version_h := include/generated/uapi/linux/version.h
266 clean-targets := %clean mrproper cleandocs
267 no-dot-config-targets := $(clean-targets) \
268 cscope gtags TAGS tags help% %docs check% coccicheck \
269 $(version_h) headers headers_% archheaders archscripts \
270 %asm-generic kernelversion %src-pkg dt_binding_check \
272 # Installation targets should not require compiler. Unfortunately, vdso_install
273 # is an exception where build artifacts may be updated. This must be fixed.
274 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
275 headers_install modules_install kernelrelease image_name
276 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
278 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
287 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
293 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
294 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
299 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
300 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
305 ifneq ($(KBUILD_EXTMOD),)
309 ifeq ($(KBUILD_EXTMOD),)
310 ifneq ($(filter %config,$(MAKECMDGOALS)),)
312 ifneq ($(words $(MAKECMDGOALS)),1)
318 # We cannot build single targets and the others at the same time
319 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
321 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
326 # For "make -j clean all", "make -j mrproper defconfig all", etc.
327 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
328 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
333 # install and modules_install need also be processed one by one
334 ifneq ($(filter install,$(MAKECMDGOALS)),)
335 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
341 # ===========================================================================
342 # We're called with mixed targets (*config and build targets).
343 # Handle them one by one.
345 PHONY += $(MAKECMDGOALS) __build_one_by_one
347 $(MAKECMDGOALS): __build_one_by_one
352 for i in $(MAKECMDGOALS); do \
353 $(MAKE) -f $(srctree)/Makefile $$i; \
358 include $(srctree)/scripts/Kbuild.include
360 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
361 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
362 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
363 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
365 include $(srctree)/scripts/subarch.include
367 # Cross compiling and selecting different set of gcc/bin-utils
368 # ---------------------------------------------------------------------------
370 # When performing cross compilation for other architectures ARCH shall be set
371 # to the target architecture. (See arch/* for the possibilities).
372 # ARCH can be set during invocation of make:
374 # Another way is to have ARCH set in the environment.
375 # The default ARCH is the host where make is executed.
377 # CROSS_COMPILE specify the prefix used for all executables used
378 # during compilation. Only gcc and related bin-utils executables
379 # are prefixed with $(CROSS_COMPILE).
380 # CROSS_COMPILE can be set on the command line
381 # make CROSS_COMPILE=ia64-linux-
382 # Alternatively CROSS_COMPILE can be set in the environment.
383 # Default value for CROSS_COMPILE is not to prefix executables
384 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
387 # Architecture as present in compile.h
388 UTS_MACHINE := $(ARCH)
391 # Additional ARCH settings for x86
395 ifeq ($(ARCH),x86_64)
399 # Additional ARCH settings for sparc
400 ifeq ($(ARCH),sparc32)
403 ifeq ($(ARCH),sparc64)
407 export cross_compiling :=
408 ifneq ($(SRCARCH),$(SUBARCH))
412 KCONFIG_CONFIG ?= .config
413 export KCONFIG_CONFIG
415 # SHELL used by kbuild
418 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
419 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
420 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
430 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
431 -O2 -fomit-frame-pointer -std=gnu89
432 export KBUILD_USERLDFLAGS :=
434 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
435 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
436 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
437 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
439 # Make variables (CC, etc...)
446 OBJCOPY = llvm-objcopy
447 OBJDUMP = llvm-objdump
448 READELF = llvm-readelf
451 CC = $(CROSS_COMPILE)gcc
452 LD = $(CROSS_COMPILE)ld
453 AR = $(CROSS_COMPILE)ar
454 NM = $(CROSS_COMPILE)nm
455 OBJCOPY = $(CROSS_COMPILE)objcopy
456 OBJDUMP = $(CROSS_COMPILE)objdump
457 READELF = $(CROSS_COMPILE)readelf
458 STRIP = $(CROSS_COMPILE)strip
461 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
465 INSTALLKERNEL := installkernel
479 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
480 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
489 # Use USERINCLUDE when you must reference the UAPI directories only.
491 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
492 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
493 -I$(srctree)/include/uapi \
494 -I$(objtree)/include/generated/uapi \
495 -include $(srctree)/include/linux/compiler-version.h \
496 -include $(srctree)/include/linux/kconfig.h
498 # Use LINUXINCLUDE when you must reference the include/ directory.
499 # Needed to be compatible with the O= option
501 -I$(srctree)/arch/$(SRCARCH)/include \
502 -I$(objtree)/arch/$(SRCARCH)/include/generated \
503 $(if $(building_out_of_srctree),-I$(srctree)/include) \
504 -I$(objtree)/include \
507 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
508 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
509 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
510 -Werror=implicit-function-declaration -Werror=implicit-int \
511 -Werror=return-type -Wno-format-security \
513 KBUILD_CPPFLAGS := -D__KERNEL__
514 KBUILD_AFLAGS_KERNEL :=
515 KBUILD_CFLAGS_KERNEL :=
516 KBUILD_AFLAGS_MODULE := -DMODULE
517 KBUILD_CFLAGS_MODULE := -DMODULE
518 KBUILD_LDFLAGS_MODULE :=
522 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
523 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
524 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
525 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
526 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
528 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
529 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
530 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
531 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
532 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
534 # Files to ignore in find ... statements
536 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
537 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
539 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
540 --exclude CVS --exclude .pc --exclude .hg --exclude .git
542 # ===========================================================================
543 # Rules shared between *config targets and build targets
545 # Basic helpers built in scripts/basic/
546 PHONY += scripts_basic
548 $(Q)$(MAKE) $(build)=scripts/basic
550 PHONY += outputmakefile
551 ifdef building_out_of_srctree
552 # Before starting out-of-tree build, make sure the source tree is clean.
553 # outputmakefile generates a Makefile in the output directory, if using a
554 # separate output directory. This allows convenient use of make in the
556 # At the same time when output Makefile generated, generate .gitignore to
557 # ignore whole output directory
559 quiet_cmd_makefile = GEN Makefile
561 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
562 echo "include $(srctree)/Makefile"; \
566 $(Q)if [ -f $(srctree)/.config -o \
567 -d $(srctree)/include/config -o \
568 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
570 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
571 echo >&2 "*** in $(abs_srctree)";\
575 $(Q)ln -fsn $(srctree) source
577 $(Q)test -e .gitignore || \
578 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
581 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
582 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
583 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
584 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
585 CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1))
587 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
588 ifneq ($(CROSS_COMPILE),)
589 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
592 CLANG_FLAGS += -integrated-as
594 CLANG_FLAGS += -no-integrated-as
595 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
596 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
598 CLANG_FLAGS += -Werror=unknown-warning-option
599 KBUILD_CFLAGS += $(CLANG_FLAGS)
600 KBUILD_AFLAGS += $(CLANG_FLAGS)
604 # Include this also for config targets because some architectures need
605 # cc-cross-prefix to determine CROSS_COMPILE.
607 include $(srctree)/scripts/Makefile.compiler
611 # ===========================================================================
612 # *config targets only - make sure prerequisites are updated, and descend
613 # in scripts/kconfig to make the *config target
615 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
616 # KBUILD_DEFCONFIG may point out an alternative default configuration
617 # used for 'make defconfig'
618 include $(srctree)/arch/$(SRCARCH)/Makefile
619 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
621 config: outputmakefile scripts_basic FORCE
622 $(Q)$(MAKE) $(build)=scripts/kconfig $@
624 %config: outputmakefile scripts_basic FORCE
625 $(Q)$(MAKE) $(build)=scripts/kconfig $@
628 # ===========================================================================
629 # Build targets only - this includes vmlinux, arch specific targets, clean
630 # targets and others. In general all targets except *config targets.
632 # If building an external module we do not care about the all: rule
633 # but instead __all depend on modules
635 ifeq ($(KBUILD_EXTMOD),)
641 # Decide whether to build built-in, modular, or both.
642 # Normally, just do built-in.
647 # If we have only "make modules", don't compile built-in objects.
648 ifeq ($(MAKECMDGOALS),modules)
652 # If we have "make <whatever> modules", compile modules
653 # in addition to whatever we do anyway.
654 # Just "make" or "make all" shall build modules as well
656 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
660 ifeq ($(MAKECMDGOALS),)
664 export KBUILD_MODULES KBUILD_BUILTIN
667 include include/config/auto.conf
670 ifeq ($(KBUILD_EXTMOD),)
671 # Objects we will link into vmlinux / subdirs we need to visit
672 core-y := init/ usr/ arch/$(SRCARCH)/
673 drivers-y := drivers/ sound/
674 drivers-$(CONFIG_SAMPLES) += samples/
675 drivers-$(CONFIG_NET) += net/
678 endif # KBUILD_EXTMOD
680 # The all: target is the default when no target is given on the
682 # This allow a user to issue only 'make' to build a kernel including modules
683 # Defaults to vmlinux, but the arch makefile usually adds further targets
686 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
687 $(call cc-option,-fno-tree-loop-im) \
688 $(call cc-disable-warning,maybe-uninitialized,)
691 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
692 ifdef CONFIG_FUNCTION_TRACER
693 CC_FLAGS_FTRACE := -pg
696 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
697 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
698 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
699 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
700 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
701 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
702 export RETPOLINE_CFLAGS
703 export RETPOLINE_VDSO_CFLAGS
705 include $(srctree)/arch/$(SRCARCH)/Makefile
708 ifdef may-sync-config
709 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
710 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
711 # because some architectures define CROSS_COMPILE there.
712 include include/config/auto.conf.cmd
716 @echo >&2 '*** Configuration file "$@" not found!'
718 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
719 @echo >&2 '*** "make menuconfig" or "make xconfig").'
723 # The actual configuration files used during the build are stored in
724 # include/generated/ and include/config/. Update them if .config is newer than
725 # include/config/auto.conf (which mirrors .config).
727 # This exploits the 'multi-target pattern rule' trick.
728 # The syncconfig should be executed only once to make all the targets.
729 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
731 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
732 # so you cannot notice that Kconfig is waiting for the user input.
733 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
734 $(Q)$(kecho) " SYNC $@"
735 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
736 else # !may-sync-config
737 # External modules and some install targets need include/generated/autoconf.h
738 # and include/config/auto.conf but do not care if they are up-to-date.
739 # Use auto.conf to trigger the test
740 PHONY += include/config/auto.conf
742 include/config/auto.conf:
743 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
745 echo >&2 " ERROR: Kernel configuration is invalid."; \
746 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
747 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
751 endif # may-sync-config
754 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
755 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
756 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
757 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
758 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
760 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
762 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
764 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
768 # Tell gcc to never replace conditional load with a non-conditional one
769 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
770 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 += $(call cc-option,-fno-reorder-blocks,) \
778 $(call cc-option,-fno-ipa-cp-clone,) \
779 $(call cc-option,-fno-partial-inlining)
782 ifneq ($(CONFIG_FRAME_WARN),0)
783 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
786 stackp-flags-y := -fno-stack-protector
787 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
788 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
790 KBUILD_CFLAGS += $(stackp-flags-y)
792 ifdef CONFIG_CC_IS_CLANG
793 KBUILD_CPPFLAGS += -Qunused-arguments
794 KBUILD_CFLAGS += -Wno-format-invalid-specifier
795 KBUILD_CFLAGS += -Wno-gnu
796 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
797 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
798 # See modpost pattern 2
799 KBUILD_CFLAGS += -mno-global-merge
802 # Warn about unmarked fall-throughs in switch statement.
803 # Disabled for clang while comment to attribute conversion happens and
804 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
805 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=5,)
808 # These warnings generated too much noise in a regular build.
809 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
810 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
812 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
813 ifdef CONFIG_FRAME_POINTER
814 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
816 # Some targets (ARM with Thumb2, for example), can't be built with frame
817 # pointers. For those, we don't have FUNCTION_TRACER automatically
818 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
819 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
820 # -fomit-frame-pointer with FUNCTION_TRACER.
821 ifndef CONFIG_FUNCTION_TRACER
822 KBUILD_CFLAGS += -fomit-frame-pointer
826 # Initialize all stack variables with a 0xAA pattern.
827 ifdef CONFIG_INIT_STACK_ALL_PATTERN
828 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
831 # Initialize all stack variables with a zero value.
832 ifdef CONFIG_INIT_STACK_ALL_ZERO
833 # Future support for zero initialization is still being debated, see
834 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
835 # renamed or dropped.
836 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
837 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
840 # While VLAs have been removed, GCC produces unreachable stack probes
841 # for the randomize_kstack_offset feature. Disable it for all compilers.
842 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
846 # Workaround for GCC versions < 5.0
847 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
848 ifdef CONFIG_CC_IS_GCC
849 DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
852 ifdef CONFIG_DEBUG_INFO
854 ifdef CONFIG_DEBUG_INFO_SPLIT
855 DEBUG_CFLAGS += -gsplit-dwarf
860 ifneq ($(LLVM_IAS),1)
861 KBUILD_AFLAGS += -Wa,-gdwarf-2
864 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
865 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
866 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
867 DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
870 ifdef CONFIG_DEBUG_INFO_REDUCED
871 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
872 $(call cc-option,-fno-var-tracking)
875 ifdef CONFIG_DEBUG_INFO_COMPRESSED
876 DEBUG_CFLAGS += -gz=zlib
877 KBUILD_AFLAGS += -gz=zlib
878 KBUILD_LDFLAGS += --compress-debug-sections=zlib
881 endif # CONFIG_DEBUG_INFO
883 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
886 ifdef CONFIG_FUNCTION_TRACER
887 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
888 CC_FLAGS_FTRACE += -mrecord-mcount
889 ifdef CONFIG_HAVE_NOP_MCOUNT
890 ifeq ($(call cc-option-yn, -mnop-mcount),y)
891 CC_FLAGS_FTRACE += -mnop-mcount
892 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
896 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
897 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
899 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
900 ifdef CONFIG_HAVE_C_RECORDMCOUNT
901 BUILD_C_RECORDMCOUNT := y
902 export BUILD_C_RECORDMCOUNT
905 ifdef CONFIG_HAVE_FENTRY
906 ifeq ($(call cc-option-yn, -mfentry),y)
907 CC_FLAGS_FTRACE += -mfentry
908 CC_FLAGS_USING += -DCC_USING_FENTRY
911 export CC_FLAGS_FTRACE
912 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
913 KBUILD_AFLAGS += $(CC_FLAGS_USING)
916 # We trigger additional mismatches with less inlining
917 ifdef CONFIG_DEBUG_SECTION_MISMATCH
918 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
921 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
922 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
923 LDFLAGS_vmlinux += --gc-sections
926 ifdef CONFIG_SHADOW_CALL_STACK
927 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
928 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
932 ifdef CONFIG_LTO_CLANG
933 ifdef CONFIG_LTO_CLANG_THIN
934 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
935 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
937 CC_FLAGS_LTO := -flto
939 CC_FLAGS_LTO += -fvisibility=hidden
941 # Limit inlining across translation units to reduce binary size
942 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
944 # Check for frame size exceeding threshold during prolog/epilog insertion
945 # when using lld < 13.0.0.
946 ifneq ($(CONFIG_FRAME_WARN),0)
947 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
948 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
954 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
955 KBUILD_AFLAGS += -fno-lto
959 ifdef CONFIG_CFI_CLANG
960 CC_FLAGS_CFI := -fsanitize=cfi \
961 -fsanitize-cfi-cross-dso \
962 -fno-sanitize-cfi-canonical-jump-tables \
963 -fno-sanitize-trap=cfi \
964 -fno-sanitize-blacklist
966 ifdef CONFIG_CFI_PERMISSIVE
967 CC_FLAGS_CFI += -fsanitize-recover=cfi
970 # If LTO flags are filtered out, we must also filter out CFI.
971 CC_FLAGS_LTO += $(CC_FLAGS_CFI)
972 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
976 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
977 KBUILD_CFLAGS += -falign-functions=64
980 # arch Makefile may override CC so keep this after arch Makefile is included
981 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
983 # warn about C99 declaration after statement
984 KBUILD_CFLAGS += -Wdeclaration-after-statement
986 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
987 KBUILD_CFLAGS += -Wvla
989 # disable pointer signed / unsigned warnings in gcc 4.0
990 KBUILD_CFLAGS += -Wno-pointer-sign
992 # disable stringop warnings in gcc 8+
993 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
995 # We'll want to enable this eventually, but it's not going away for 5.7 at least
996 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
997 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
998 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
1000 # Another good warning that we'll want to enable eventually
1001 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1003 # Enabled with W=2, disabled by default as noisy
1004 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
1006 # disable invalid "can't wrap" optimizations for signed / pointers
1007 KBUILD_CFLAGS += -fno-strict-overflow
1009 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1010 KBUILD_CFLAGS += -fno-stack-check
1012 # conserve stack if available
1013 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
1015 # Prohibit date/time macros, which would make the build non-deterministic
1016 KBUILD_CFLAGS += -Werror=date-time
1018 # enforce correct pointer usage
1019 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
1021 # Require designated initializers for all marked structures
1022 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1024 # change __FILE__ to the relative path from the srctree
1025 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1027 # include additional Makefiles when needed
1028 include-y := scripts/Makefile.extrawarn
1029 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1030 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1031 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1032 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1033 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1035 include $(addprefix $(srctree)/, $(include-y))
1037 # scripts/Makefile.gcc-plugins is intentionally included last.
1038 # Do not add $(call cc-option,...) below this line. When you build the kernel
1039 # from the clean source tree, the GCC plugins do not exist at this point.
1041 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1042 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1043 KBUILD_AFLAGS += $(KAFLAGS)
1044 KBUILD_CFLAGS += $(KCFLAGS)
1046 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1047 LDFLAGS_vmlinux += --build-id=sha1
1049 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1050 LDFLAGS_vmlinux += $(call ld-option, -X,)
1053 ifeq ($(CONFIG_RELR),y)
1054 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1057 # We never want expected sections to be placed heuristically by the
1058 # linker. All sections should be explicitly named in the linker script.
1059 ifdef CONFIG_LD_ORPHAN_WARN
1060 LDFLAGS_vmlinux += --orphan-handling=warn
1063 # Align the bit size of userspace programs with the kernel
1064 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1065 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1067 # make the checker run with the right architecture
1068 CHECKFLAGS += --arch=$(ARCH)
1070 # insure the checker run with the right endianness
1071 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1073 # the checker needs the correct machine size
1074 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1076 # Default kernel image to build when no specific target is given.
1077 # KBUILD_IMAGE may be overruled on the command line or
1078 # set in the environment
1079 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1080 # this default value
1081 export KBUILD_IMAGE ?= vmlinux
1084 # INSTALL_PATH specifies where to place the updated kernel and system map
1085 # images. Default is /boot, but you can set it to other values
1086 export INSTALL_PATH ?= /boot
1089 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1090 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1091 # an argument if needed. Otherwise it defaults to the kernel install path
1093 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1096 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1097 # relocations required by build roots. This is not defined in the
1098 # makefile but the argument can be passed to make if needed.
1101 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1106 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1107 export MODORDER := $(extmod_prefix)modules.order
1108 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1110 ifeq ($(KBUILD_EXTMOD),)
1111 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1113 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1114 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1115 $(libs-y) $(libs-m)))
1117 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1118 $(patsubst %/,%,$(filter %/, $(core-) \
1119 $(drivers-) $(libs-))))
1121 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1122 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1123 $(drivers-y) $(drivers-m)))
1125 build-dirs := $(vmlinux-dirs)
1126 clean-dirs := $(vmlinux-alldirs)
1128 # Externally visible symbols (used by link-vmlinux.sh)
1129 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1130 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1131 ifdef CONFIG_MODULES
1132 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1133 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1135 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1137 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1139 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1140 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1141 # used by scripts/Makefile.package
1142 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1144 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1146 # Recurse until adjust_autoksyms.sh is satisfied
1147 PHONY += autoksyms_recursive
1148 ifdef CONFIG_TRIM_UNUSED_KSYMS
1149 # For the kernel to actually contain only the needed exported symbols,
1150 # we have to build modules as well to determine what those symbols are.
1151 # (this can be evaluated only once include/config/auto.conf has been included)
1154 autoksyms_recursive: descend modules.order
1155 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1156 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1159 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1161 quiet_cmd_autoksyms_h = GEN $@
1162 cmd_autoksyms_h = mkdir -p $(dir $@); \
1163 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1166 $(call cmd,autoksyms_h)
1168 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1170 # Final link of vmlinux with optional arch pass after final link
1171 cmd_link-vmlinux = \
1172 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1173 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1175 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1176 +$(call if_changed_dep,link-vmlinux)
1180 # The actual objects are generated when descending,
1181 # make sure no implicit rule kicks in
1182 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1184 filechk_kernel.release = \
1185 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1187 # Store (new) KERNELRELEASE string in include/config/kernel.release
1188 include/config/kernel.release: FORCE
1189 $(call filechk,kernel.release)
1191 # Additional helpers built in scripts/
1192 # Carefully list dependencies so we do not try to build scripts twice
1195 scripts: scripts_basic scripts_dtc
1196 $(Q)$(MAKE) $(build)=$(@)
1198 # Things we need to do before we recursively start building the kernel
1199 # or the modules are listed in "prepare".
1200 # A multi level approach is used. prepareN is processed before prepareN-1.
1201 # archprepare is used in arch Makefiles and when processed asm symlink,
1202 # version.h and scripts_basic is processed / created.
1204 PHONY += prepare archprepare
1206 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1207 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1208 include/generated/autoconf.h remove-stale-files
1210 prepare0: archprepare
1211 $(Q)$(MAKE) $(build)=scripts/mod
1212 $(Q)$(MAKE) $(build)=.
1214 # All the preparing..
1217 PHONY += remove-stale-files
1219 $(Q)$(srctree)/scripts/remove-stale-files
1221 # Support for using generic headers in asm-generic
1222 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1224 PHONY += asm-generic uapi-asm-generic
1225 asm-generic: uapi-asm-generic
1226 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1227 generic=include/asm-generic
1229 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1230 generic=include/uapi/asm-generic
1232 # Generate some files
1233 # ---------------------------------------------------------------------------
1235 # KERNELRELEASE can change from a few different places, meaning version.h
1236 # needs to be updated, so this check is forced on all builds
1239 define filechk_utsrelease.h
1240 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1241 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1244 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1247 define filechk_version.h
1248 if [ $(SUBLEVEL) -gt 255 ]; then \
1249 echo \#define LINUX_VERSION_CODE $(shell \
1250 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1252 echo \#define LINUX_VERSION_CODE $(shell \
1253 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1255 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1256 ((c) > 255 ? 255 : (c)))'; \
1257 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1258 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1259 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1262 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1263 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1265 $(call filechk,version.h)
1267 include/generated/utsrelease.h: include/config/kernel.release FORCE
1268 $(call filechk,utsrelease.h)
1272 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1273 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1275 # ---------------------------------------------------------------------------
1278 #Default location for installed headers
1279 export INSTALL_HDR_PATH = $(objtree)/usr
1281 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1282 cmd_headers_install = \
1283 mkdir -p $(INSTALL_HDR_PATH); \
1284 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1285 usr/include $(INSTALL_HDR_PATH)
1287 PHONY += headers_install
1288 headers_install: headers
1289 $(call cmd,headers_install)
1291 PHONY += archheaders archscripts
1293 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1296 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1297 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1298 $(error Headers not exportable for the $(SRCARCH) architecture))
1299 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1300 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1302 # Deprecated. It is no-op now.
1303 PHONY += headers_check
1305 @echo >&2 "=================== WARNING ==================="
1306 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op,"
1307 @echo >&2 "and will be removed after Linux 5.15 release."
1308 @echo >&2 "Please remove headers_check from your scripts."
1309 @echo >&2 "==============================================="
1311 ifdef CONFIG_HEADERS_INSTALL
1315 PHONY += scripts_unifdef
1316 scripts_unifdef: scripts_basic
1317 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1319 # ---------------------------------------------------------------------------
1322 # Many distributions have the custom install script, /sbin/installkernel.
1323 # If DKMS is installed, 'make install' will eventually recuses back
1324 # to the this Makefile to build and install external modules.
1325 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1327 install: sub_make_done :=
1329 # ---------------------------------------------------------------------------
1332 ifdef CONFIG_STACK_VALIDATION
1333 prepare: tools/objtool
1337 ifdef CONFIG_DEBUG_INFO_BTF
1338 prepare: tools/bpf/resolve_btfids
1342 PHONY += resolve_btfids_clean
1344 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1346 # tools/bpf/resolve_btfids directory might not exist
1347 # in output directory, skip its clean in that case
1348 resolve_btfids_clean:
1349 ifneq ($(wildcard $(resolve_btfids_O)),)
1350 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1353 # Clear a bunch of variables before executing the submake
1354 ifeq ($(quiet),silent_)
1359 $(Q)mkdir -p $(objtree)/tools
1360 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1363 $(Q)mkdir -p $(objtree)/tools
1364 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1366 # ---------------------------------------------------------------------------
1371 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1374 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1376 PHONY += kselftest-merge
1378 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1379 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1380 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1381 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1383 # ---------------------------------------------------------------------------
1386 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1387 dtstree := arch/$(SRCARCH)/boot/dts
1392 %.dtb: include/config/kernel.release scripts_dtc
1393 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1395 %.dtbo: include/config/kernel.release scripts_dtc
1396 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1398 PHONY += dtbs dtbs_install dtbs_check
1399 dtbs: include/config/kernel.release scripts_dtc
1400 $(Q)$(MAKE) $(build)=$(dtstree)
1402 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1404 dtbs: dt_binding_check
1410 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1412 ifdef CONFIG_OF_EARLY_FLATTREE
1418 PHONY += scripts_dtc
1419 scripts_dtc: scripts_basic
1420 $(Q)$(MAKE) $(build)=scripts/dtc
1422 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1423 export CHECK_DT_BINDING=y
1426 PHONY += dt_binding_check
1427 dt_binding_check: scripts_dtc
1428 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1430 # ---------------------------------------------------------------------------
1433 ifdef CONFIG_MODULES
1435 # By default, build modules as well
1439 # When we're building modules with modversions, we need to consider
1440 # the built-in objects during the descend as well, in order to
1441 # make sure the checksums are up to date before we record them.
1442 ifdef CONFIG_MODVERSIONS
1448 # A module can be listed more than once in obj-m resulting in
1449 # duplicate lines in modules.order files. Those are removed
1450 # using awk while concatenating to the final file.
1453 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1455 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1457 modules.order: $(subdir-modorder) FORCE
1458 $(call if_changed,modules_order)
1460 targets += modules.order
1462 # Target to prepare building external modules
1463 PHONY += modules_prepare
1464 modules_prepare: prepare
1465 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1467 export modules_sign_only :=
1469 ifeq ($(CONFIG_MODULE_SIG),y)
1470 PHONY += modules_sign
1471 modules_sign: modules_install
1474 # modules_sign is a subset of modules_install.
1475 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1476 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1477 modules_sign_only := y
1482 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1483 modinst_pre := __modinst_pre
1486 modules_install: $(modinst_pre)
1487 PHONY += __modinst_pre
1489 @rm -rf $(MODLIB)/kernel
1490 @rm -f $(MODLIB)/source
1491 @mkdir -p $(MODLIB)/kernel
1492 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1493 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1494 rm -f $(MODLIB)/build ; \
1495 ln -s $(CURDIR) $(MODLIB)/build ; \
1497 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1498 @cp -f modules.builtin $(MODLIB)/
1499 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1501 endif # CONFIG_MODULES
1504 # Cleaning is done on three levels.
1505 # make clean Delete most generated files
1506 # Leave enough to build external modules
1507 # make mrproper Delete the current configuration, and all generated files
1508 # make distclean Remove editor backup files, patch leftover files and the like
1510 # Directories & files removed with 'make clean'
1511 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1512 modules.builtin modules.builtin.modinfo modules.nsdeps \
1513 compile_commands.json .thinlto-cache
1515 # Directories & files removed with 'make mrproper'
1516 MRPROPER_FILES += include/config include/generated \
1517 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1518 debian snap tar-install \
1519 .config .config.old .version \
1521 certs/signing_key.pem certs/signing_key.x509 \
1526 # clean - Delete most, but leave enough to build external modules
1528 clean: rm-files := $(CLEAN_FILES)
1530 PHONY += archclean vmlinuxclean
1533 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1534 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1536 clean: archclean vmlinuxclean resolve_btfids_clean
1538 # mrproper - Delete all generated files, including .config
1540 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1541 mrproper-dirs := $(addprefix _mrproper_,scripts)
1543 PHONY += $(mrproper-dirs) mrproper
1545 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1547 mrproper: clean $(mrproper-dirs)
1555 @find . $(RCS_FIND_IGNORE) \
1556 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1557 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1558 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1559 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1560 -type f -print | xargs rm -f
1563 # Packaging of the kernel to various formats
1564 # ---------------------------------------------------------------------------
1567 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1568 %pkg: include/config/kernel.release FORCE
1569 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1571 # Brief documentation of the typical targets used
1572 # ---------------------------------------------------------------------------
1574 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1575 boards := $(sort $(notdir $(boards)))
1576 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1577 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1581 @echo 'Cleaning targets:'
1582 @echo ' clean - Remove most generated files but keep the config and'
1583 @echo ' enough build support to build external modules'
1584 @echo ' mrproper - Remove all generated files + config + various backup files'
1585 @echo ' distclean - mrproper + remove editor backup and patch files'
1587 @echo 'Configuration targets:'
1588 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1590 @echo 'Other generic targets:'
1591 @echo ' all - Build all targets marked with [*]'
1592 @echo '* vmlinux - Build the bare kernel'
1593 @echo '* modules - Build all modules'
1594 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1595 @echo ' dir/ - Build all files in dir and below'
1596 @echo ' dir/file.[ois] - Build specified target only'
1597 @echo ' dir/file.ll - Build the LLVM assembly file'
1598 @echo ' (requires compiler support for LLVM assembly generation)'
1599 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1600 @echo ' (requires a recent binutils and recent build (System.map))'
1601 @echo ' dir/file.ko - Build module including final link'
1602 @echo ' modules_prepare - Set up for building external modules'
1603 @echo ' tags/TAGS - Generate tags file for editors'
1604 @echo ' cscope - Generate cscope index'
1605 @echo ' gtags - Generate GNU GLOBAL index'
1606 @echo ' kernelrelease - Output the release version string (use with make -s)'
1607 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1608 @echo ' image_name - Output the image name (use with make -s)'
1609 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1610 echo ' (default: $(INSTALL_HDR_PATH))'; \
1612 @echo 'Static analysers:'
1613 @echo ' checkstack - Generate a list of stack hogs'
1614 @echo ' versioncheck - Sanity check on version.h usage'
1615 @echo ' includecheck - Check for duplicate included header files'
1616 @echo ' export_report - List the usages of all exported symbols'
1617 @echo ' headerdep - Detect inclusion cycles in headers'
1618 @echo ' coccicheck - Check with Coccinelle'
1619 @echo ' clang-analyzer - Check with clang static analyzer'
1620 @echo ' clang-tidy - Check with clang-tidy'
1623 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1625 @echo 'Kernel selftest:'
1626 @echo ' kselftest - Build and run kernel selftest'
1627 @echo ' Build, install, and boot kernel before'
1628 @echo ' running kselftest on it'
1629 @echo ' Run as root for full coverage'
1630 @echo ' kselftest-all - Build kernel selftest'
1631 @echo ' kselftest-install - Build and install kernel selftest'
1632 @echo ' kselftest-clean - Remove all generated kselftest files'
1633 @echo ' kselftest-merge - Merge all the config dependencies of'
1634 @echo ' kselftest to existing .config.'
1637 echo 'Devicetree:'; \
1638 echo '* dtbs - Build device tree blobs for enabled boards'; \
1639 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1640 echo ' dt_binding_check - Validate device tree binding documents'; \
1641 echo ' dtbs_check - Validate device tree source files';\
1644 @echo 'Userspace tools targets:'
1645 @echo ' use "make tools/help"'
1646 @echo ' or "cd tools; make help"'
1648 @echo 'Kernel packaging:'
1649 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1651 @echo 'Documentation targets:'
1652 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1654 @echo 'Architecture specific targets ($(SRCARCH)):'
1655 @$(if $(archhelp),$(archhelp),\
1656 echo ' No architecture specific help defined for $(SRCARCH)')
1659 $(foreach b, $(boards), \
1660 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1662 @$(if $(board-dirs), \
1663 $(foreach b, $(board-dirs), \
1664 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1665 printf " %-16s - Show all of the above\\n" help-boards; \
1668 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1669 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1670 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1671 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1672 @echo ' (sparse by default)'
1673 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1674 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1675 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1676 @echo ' 1: warnings which may be relevant and do not occur too often'
1677 @echo ' 2: warnings which occur quite often but may still be relevant'
1678 @echo ' 3: more obscure warnings, can most likely be ignored'
1679 @echo ' Multiple levels can be combined with W=12 or W=123'
1681 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1682 @echo 'For further info see the ./README file'
1685 help-board-dirs := $(addprefix help-,$(board-dirs))
1687 help-boards: $(help-board-dirs)
1689 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1691 $(help-board-dirs): help-%:
1692 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1693 @$(if $(boards-per-dir), \
1694 $(foreach b, $(boards-per-dir), \
1695 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1699 # Documentation targets
1700 # ---------------------------------------------------------------------------
1701 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1702 linkcheckdocs dochelp refcheckdocs
1703 PHONY += $(DOC_TARGETS)
1705 $(Q)$(MAKE) $(build)=Documentation $@
1708 # ---------------------------------------------------------------------------
1710 PHONY += scripts_gdb
1711 scripts_gdb: prepare0
1712 $(Q)$(MAKE) $(build)=scripts/gdb
1713 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1715 ifdef CONFIG_GDB_SCRIPTS
1719 else # KBUILD_EXTMOD
1722 # External module support.
1723 # When building external modules the kernel used as basis is considered
1724 # read-only, and no consistency checks are made and the make
1725 # system is not used on the basis kernel. If updates are required
1726 # in the basis kernel ordinary make commands (without M=...) must be used.
1728 # We are always building only modules.
1732 build-dirs := $(KBUILD_EXTMOD)
1733 $(MODORDER): descend
1736 compile_commands.json: $(extmod_prefix)compile_commands.json
1737 PHONY += compile_commands.json
1739 clean-dirs := $(KBUILD_EXTMOD)
1740 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1741 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1745 @echo ' Building external modules.'
1746 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1748 @echo ' modules - default target, build the module(s)'
1749 @echo ' modules_install - install the module'
1750 @echo ' clean - remove generated files in module directory only'
1753 # no-op for external module builds
1754 PHONY += prepare modules_prepare
1756 endif # KBUILD_EXTMOD
1758 # ---------------------------------------------------------------------------
1761 PHONY += modules modules_install
1763 ifdef CONFIG_MODULES
1765 modules: modules_check
1766 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1768 PHONY += modules_check
1769 modules_check: $(MODORDER)
1770 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1772 quiet_cmd_depmod = DEPMOD $(MODLIB)
1773 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1777 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1780 else # CONFIG_MODULES
1782 # Modules not configured
1783 # ---------------------------------------------------------------------------
1785 modules modules_install:
1787 @echo >&2 '*** The present kernel configuration has modules disabled.'
1788 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1789 @echo >&2 '*** to enable CONFIG_MODULES.'
1793 endif # CONFIG_MODULES
1796 # ---------------------------------------------------------------------------
1797 # To build individual files in subdirectories, you can do like this:
1799 # make foo/bar/baz.s
1801 # The supported suffixes for single-target are listed in 'single-targets'
1803 # To build only under specific subdirectories, you can do like this:
1809 # .ko is special because modpost is needed
1810 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1811 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1813 $(single-ko): single_modpost
1815 $(single-no-ko): descend
1818 ifeq ($(KBUILD_EXTMOD),)
1819 # For the single build of in-tree modules, use a temporary file to avoid
1820 # the situation of modules_install installing an invalid modules.order.
1821 MODORDER := .modules.tmp
1824 PHONY += single_modpost
1825 single_modpost: $(single-no-ko) modules_prepare
1826 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
1827 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1831 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
1833 # trim unrelated directories
1834 build-dirs := $(foreach d, $(build-dirs), \
1835 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1839 ifndef CONFIG_MODULES
1843 # Handle descending into subdirectories listed in $(build-dirs)
1844 # Preset locale variables to speed up the build process. Limit locale
1845 # tweaks to this spot to avoid wrong language settings when running
1846 # make menuconfig etc.
1847 # Error messages still appears in the original language
1848 PHONY += descend $(build-dirs)
1849 descend: $(build-dirs)
1850 $(build-dirs): prepare
1851 $(Q)$(MAKE) $(build)=$@ \
1852 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1853 need-builtin=1 need-modorder=1
1855 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1856 PHONY += $(clean-dirs) clean
1858 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1860 clean: $(clean-dirs)
1862 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1863 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1865 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1866 -o -name '*.dwo' -o -name '*.lst' \
1867 -o -name '*.su' -o -name '*.mod' \
1868 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1869 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1870 -o -name '*.asn1.[ch]' \
1871 -o -name '*.symtypes' -o -name 'modules.order' \
1872 -o -name '.tmp_*.o.*' \
1873 -o -name '*.c.[012]*.*' \
1876 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1878 # Generate tags for editors
1879 # ---------------------------------------------------------------------------
1880 quiet_cmd_tags = GEN $@
1881 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1883 tags TAGS cscope gtags: FORCE
1886 # Script to generate missing namespace dependencies
1887 # ---------------------------------------------------------------------------
1890 nsdeps: export KBUILD_NSDEPS=1
1892 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1895 # ---------------------------------------------------------------------------
1897 quiet_cmd_gen_compile_commands = GEN $@
1898 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1900 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1901 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1902 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1903 $(call if_changed,gen_compile_commands)
1905 targets += $(extmod_prefix)compile_commands.json
1907 PHONY += clang-tidy clang-analyzer
1909 ifdef CONFIG_CC_IS_CLANG
1910 quiet_cmd_clang_tools = CHECK $<
1911 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1913 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1914 $(call cmd,clang_tools)
1916 clang-tidy clang-analyzer:
1917 @echo "$@ requires CC=clang" >&2
1921 # Scripts to check various things for consistency
1922 # ---------------------------------------------------------------------------
1924 PHONY += includecheck versioncheck coccicheck export_report
1927 find $(srctree)/* $(RCS_FIND_IGNORE) \
1928 -name '*.[hcS]' -type f -print | sort \
1929 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1932 find $(srctree)/* $(RCS_FIND_IGNORE) \
1933 -name '*.[hcS]' -type f -print | sort \
1934 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1937 $(Q)$(BASH) $(srctree)/scripts/$@
1940 $(PERL) $(srctree)/scripts/export_report.pl
1942 PHONY += checkstack kernelrelease kernelversion image_name
1944 # UML needs a little special treatment here. It wants to use the host
1945 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1946 # else wants $(ARCH), including people doing cross-builds, which means
1947 # that $(SUBARCH) doesn't work here.
1949 CHECKSTACK_ARCH := $(SUBARCH)
1951 CHECKSTACK_ARCH := $(ARCH)
1954 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1955 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1958 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1961 @echo $(KERNELVERSION)
1964 @echo $(KBUILD_IMAGE)
1966 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1967 cmd_rmfiles = rm -rf $(rm-files)
1969 # read saved command lines for existing targets
1970 existing-targets := $(wildcard $(sort $(targets)))
1972 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1974 endif # config-build
1976 endif # need-sub-make
1981 # Declare the contents of the PHONY variable as phony. We keep that
1982 # information in a variable so we can use it in if_changed and friends.