1 # SPDX-License-Identifier: GPL-2.0
6 NAME = Frozen Wasteland
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 $(error building multiple external modules is not supported))
134 # Kbuild will save output files in the current working directory.
135 # This does not need to match to the root of the kernel source tree.
137 # For example, you can do this:
139 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
141 # If you want to save output files in a different location, there are
142 # two syntaxes to specify it.
145 # Use "make O=dir/to/store/output/files/"
147 # 2) Set KBUILD_OUTPUT
148 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
149 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
151 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
154 # Do we want to change the working directory?
155 ifeq ("$(origin O)", "command line")
156 KBUILD_OUTPUT := $(O)
159 ifneq ($(KBUILD_OUTPUT),)
160 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
161 # expand a shell special character '~'. We use a somewhat tedious way here.
162 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
163 $(if $(abs_objtree),, \
164 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
166 # $(realpath ...) resolves symlinks
167 abs_objtree := $(realpath $(abs_objtree))
169 abs_objtree := $(CURDIR)
170 endif # ifneq ($(KBUILD_OUTPUT),)
172 ifeq ($(abs_objtree),$(CURDIR))
173 # Suppress "Entering directory ..." unless we are changing the work directory.
174 MAKEFLAGS += --no-print-directory
179 this-makefile := $(lastword $(MAKEFILE_LIST))
180 abs_srctree := $(realpath $(dir $(this-makefile)))
182 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
183 $(error source directory cannot contain spaces or colons)
186 ifneq ($(abs_srctree),$(abs_objtree))
187 # Look for make include files relative to root of kernel src
189 # This does not become effective immediately because MAKEFLAGS is re-parsed
190 # once after the Makefile is read. We need to invoke sub-make.
191 MAKEFLAGS += --include-dir=$(abs_srctree)
195 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
196 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
197 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
199 # Cancel implicit rules for this Makefile.
203 export abs_srctree abs_objtree
204 export sub_make_done := 1
206 ifeq ($(need-sub-make),1)
208 PHONY += $(MAKECMDGOALS) __sub-make
210 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
213 # Invoke a second make in the output directory, passing relevant variables
215 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
217 endif # need-sub-make
218 endif # sub_make_done
220 # We process the rest of the Makefile if this is the final invocation of make
221 ifeq ($(need-sub-make),)
223 # Do not print "Entering directory ...",
224 # but we want to display it when entering to the output directory
225 # so that IDEs/editors are able to understand relative filenames.
226 MAKEFLAGS += --no-print-directory
228 ifeq ($(abs_srctree),$(abs_objtree))
229 # building in the source tree
231 building_out_of_srctree :=
233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
234 # building in a subdirectory of the source tree
237 srctree := $(abs_srctree)
239 building_out_of_srctree := 1
242 ifneq ($(KBUILD_ABS_SRCTREE),)
243 srctree := $(abs_srctree)
249 export building_out_of_srctree srctree objtree VPATH
251 # To make sure we do not include .config for any of the *config targets
252 # catch them early, and hand them over to scripts/kconfig/Makefile
253 # It is allowed to specify more targets when calling make, including
254 # mixing *config targets and build targets.
255 # For example 'make oldconfig all'.
256 # Detect when mixed targets is specified, and make a second invocation
257 # of make so .config is not included in this case either (for *config).
259 version_h := include/generated/uapi/linux/version.h
261 clean-targets := %clean mrproper cleandocs
262 no-dot-config-targets := $(clean-targets) \
263 cscope gtags TAGS tags help% %docs check% coccicheck \
264 $(version_h) headers headers_% archheaders archscripts \
265 %asm-generic kernelversion %src-pkg dt_binding_check \
267 # Installation targets should not require compiler. Unfortunately, vdso_install
268 # is an exception where build artifacts may be updated. This must be fixed.
269 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
270 headers_install modules_install kernelrelease image_name
271 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
273 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
282 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
283 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
288 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
289 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
294 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
295 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
300 ifneq ($(KBUILD_EXTMOD),)
304 ifeq ($(KBUILD_EXTMOD),)
305 ifneq ($(filter %config,$(MAKECMDGOALS)),)
307 ifneq ($(words $(MAKECMDGOALS)),1)
313 # We cannot build single targets and the others at the same time
314 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
316 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
321 # For "make -j clean all", "make -j mrproper defconfig all", etc.
322 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
323 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
328 # install and modules_install need also be processed one by one
329 ifneq ($(filter install,$(MAKECMDGOALS)),)
330 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
336 # ===========================================================================
337 # We're called with mixed targets (*config and build targets).
338 # Handle them one by one.
340 PHONY += $(MAKECMDGOALS) __build_one_by_one
342 $(MAKECMDGOALS): __build_one_by_one
347 for i in $(MAKECMDGOALS); do \
348 $(MAKE) -f $(srctree)/Makefile $$i; \
353 include $(srctree)/scripts/Kbuild.include
355 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
356 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
357 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
358 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
360 include $(srctree)/scripts/subarch.include
362 # Cross compiling and selecting different set of gcc/bin-utils
363 # ---------------------------------------------------------------------------
365 # When performing cross compilation for other architectures ARCH shall be set
366 # to the target architecture. (See arch/* for the possibilities).
367 # ARCH can be set during invocation of make:
369 # Another way is to have ARCH set in the environment.
370 # The default ARCH is the host where make is executed.
372 # CROSS_COMPILE specify the prefix used for all executables used
373 # during compilation. Only gcc and related bin-utils executables
374 # are prefixed with $(CROSS_COMPILE).
375 # CROSS_COMPILE can be set on the command line
376 # make CROSS_COMPILE=ia64-linux-
377 # Alternatively CROSS_COMPILE can be set in the environment.
378 # Default value for CROSS_COMPILE is not to prefix executables
379 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
382 # Architecture as present in compile.h
383 UTS_MACHINE := $(ARCH)
386 # Additional ARCH settings for x86
390 ifeq ($(ARCH),x86_64)
394 # Additional ARCH settings for sparc
395 ifeq ($(ARCH),sparc32)
398 ifeq ($(ARCH),sparc64)
402 # Additional ARCH settings for sh
407 KCONFIG_CONFIG ?= .config
408 export KCONFIG_CONFIG
410 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
411 export KBUILD_DEFCONFIG := defconfig
413 # SHELL used by kbuild
416 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
417 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
418 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
428 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
429 -O2 -fomit-frame-pointer -std=gnu89
430 export KBUILD_USERLDFLAGS :=
432 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
433 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
434 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
435 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
437 # Make variables (CC, etc...)
444 OBJCOPY = llvm-objcopy
445 OBJDUMP = llvm-objdump
446 READELF = llvm-readelf
449 CC = $(CROSS_COMPILE)gcc
450 LD = $(CROSS_COMPILE)ld
451 AR = $(CROSS_COMPILE)ar
452 NM = $(CROSS_COMPILE)nm
453 OBJCOPY = $(CROSS_COMPILE)objcopy
454 OBJDUMP = $(CROSS_COMPILE)objdump
455 READELF = $(CROSS_COMPILE)readelf
456 STRIP = $(CROSS_COMPILE)strip
459 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
463 INSTALLKERNEL := installkernel
477 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
478 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
487 # Use USERINCLUDE when you must reference the UAPI directories only.
489 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
490 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
491 -I$(srctree)/include/uapi \
492 -I$(objtree)/include/generated/uapi \
493 -include $(srctree)/include/linux/compiler-version.h \
494 -include $(srctree)/include/linux/kconfig.h
496 # Use LINUXINCLUDE when you must reference the include/ directory.
497 # Needed to be compatible with the O= option
499 -I$(srctree)/arch/$(SRCARCH)/include \
500 -I$(objtree)/arch/$(SRCARCH)/include/generated \
501 $(if $(building_out_of_srctree),-I$(srctree)/include) \
502 -I$(objtree)/include \
505 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
506 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
507 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
508 -Werror=implicit-function-declaration -Werror=implicit-int \
509 -Werror=return-type -Wno-format-security \
511 KBUILD_CPPFLAGS := -D__KERNEL__
512 KBUILD_AFLAGS_KERNEL :=
513 KBUILD_CFLAGS_KERNEL :=
514 KBUILD_AFLAGS_MODULE := -DMODULE
515 KBUILD_CFLAGS_MODULE := -DMODULE
516 KBUILD_LDFLAGS_MODULE :=
520 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
521 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
522 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
523 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
524 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
526 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
527 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
528 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
529 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
530 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
532 # Files to ignore in find ... statements
534 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
535 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
537 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
538 --exclude CVS --exclude .pc --exclude .hg --exclude .git
540 # ===========================================================================
541 # Rules shared between *config targets and build targets
543 # Basic helpers built in scripts/basic/
544 PHONY += scripts_basic
546 $(Q)$(MAKE) $(build)=scripts/basic
547 $(Q)rm -f .tmp_quiet_recordmcount
549 PHONY += outputmakefile
550 # Before starting out-of-tree build, make sure the source tree is clean.
551 # outputmakefile generates a Makefile in the output directory, if using a
552 # separate output directory. This allows convenient use of make in the
554 # At the same time when output Makefile generated, generate .gitignore to
555 # ignore whole output directory
557 ifdef building_out_of_srctree
558 $(Q)if [ -f $(srctree)/.config -o \
559 -d $(srctree)/include/config -o \
560 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
562 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
563 echo >&2 "*** in $(abs_srctree)";\
567 $(Q)ln -fsn $(srctree) source
568 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
569 $(Q)test -e .gitignore || \
570 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
573 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
574 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
575 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
576 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
577 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1 | sed 's/\#//g')
579 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
580 ifneq ($(CROSS_COMPILE),)
581 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
582 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
583 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
584 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
586 ifneq ($(GCC_TOOLCHAIN),)
587 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
589 ifneq ($(LLVM_IAS),1)
590 CLANG_FLAGS += -no-integrated-as
592 CLANG_FLAGS += -Werror=unknown-warning-option
593 KBUILD_CFLAGS += $(CLANG_FLAGS)
594 KBUILD_AFLAGS += $(CLANG_FLAGS)
598 # Include this also for config targets because some architectures need
599 # cc-cross-prefix to determine CROSS_COMPILE.
601 include $(srctree)/scripts/Makefile.compiler
605 # ===========================================================================
606 # *config targets only - make sure prerequisites are updated, and descend
607 # in scripts/kconfig to make the *config target
609 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
610 # KBUILD_DEFCONFIG may point out an alternative default configuration
611 # used for 'make defconfig'
612 include $(srctree)/arch/$(SRCARCH)/Makefile
613 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
615 config: outputmakefile scripts_basic FORCE
616 $(Q)$(MAKE) $(build)=scripts/kconfig $@
618 %config: outputmakefile scripts_basic FORCE
619 $(Q)$(MAKE) $(build)=scripts/kconfig $@
622 # ===========================================================================
623 # Build targets only - this includes vmlinux, arch specific targets, clean
624 # targets and others. In general all targets except *config targets.
626 # If building an external module we do not care about the all: rule
627 # but instead __all depend on modules
629 ifeq ($(KBUILD_EXTMOD),)
635 # Decide whether to build built-in, modular, or both.
636 # Normally, just do built-in.
641 # If we have only "make modules", don't compile built-in objects.
642 ifeq ($(MAKECMDGOALS),modules)
646 # If we have "make <whatever> modules", compile modules
647 # in addition to whatever we do anyway.
648 # Just "make" or "make all" shall build modules as well
650 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
654 ifeq ($(MAKECMDGOALS),)
658 export KBUILD_MODULES KBUILD_BUILTIN
661 include include/config/auto.conf
664 ifeq ($(KBUILD_EXTMOD),)
665 # Objects we will link into vmlinux / subdirs we need to visit
667 drivers-y := drivers/ sound/
668 drivers-$(CONFIG_SAMPLES) += samples/
669 drivers-$(CONFIG_NET) += net/
672 endif # KBUILD_EXTMOD
674 # The all: target is the default when no target is given on the
676 # This allow a user to issue only 'make' to build a kernel including modules
677 # Defaults to vmlinux, but the arch makefile usually adds further targets
680 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
681 $(call cc-option,-fno-tree-loop-im) \
682 $(call cc-disable-warning,maybe-uninitialized,)
685 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
686 ifdef CONFIG_FUNCTION_TRACER
687 CC_FLAGS_FTRACE := -pg
690 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
691 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
692 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
693 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
694 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
695 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
696 export RETPOLINE_CFLAGS
697 export RETPOLINE_VDSO_CFLAGS
699 include $(srctree)/arch/$(SRCARCH)/Makefile
702 ifdef may-sync-config
703 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
704 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
705 # because some architectures define CROSS_COMPILE there.
706 include include/config/auto.conf.cmd
710 @echo >&2 '*** Configuration file "$@" not found!'
712 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
713 @echo >&2 '*** "make menuconfig" or "make xconfig").'
717 # The actual configuration files used during the build are stored in
718 # include/generated/ and include/config/. Update them if .config is newer than
719 # include/config/auto.conf (which mirrors .config).
721 # This exploits the 'multi-target pattern rule' trick.
722 # The syncconfig should be executed only once to make all the targets.
723 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
724 quiet_cmd_syncconfig = SYNC $@
725 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig
727 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
728 +$(call cmd,syncconfig)
729 else # !may-sync-config
730 # External modules and some install targets need include/generated/autoconf.h
731 # and include/config/auto.conf but do not care if they are up-to-date.
732 # Use auto.conf to trigger the test
733 PHONY += include/config/auto.conf
735 include/config/auto.conf:
736 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
738 echo >&2 " ERROR: Kernel configuration is invalid."; \
739 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
740 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
744 endif # may-sync-config
747 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
748 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
749 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
750 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
751 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
753 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
755 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
757 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
761 # Tell gcc to never replace conditional load with a non-conditional one
762 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
763 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
765 ifdef CONFIG_READABLE_ASM
766 # Disable optimizations that make assembler listings hard to read.
767 # reorder blocks reorders the control in the function
768 # ipa clone creates specialized cloned functions
769 # partial inlining inlines only parts of functions
770 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
771 $(call cc-option,-fno-ipa-cp-clone,) \
772 $(call cc-option,-fno-partial-inlining)
775 ifneq ($(CONFIG_FRAME_WARN),0)
776 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
779 stackp-flags-y := -fno-stack-protector
780 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
781 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
783 KBUILD_CFLAGS += $(stackp-flags-y)
785 ifdef CONFIG_CC_IS_CLANG
786 KBUILD_CPPFLAGS += -Qunused-arguments
787 KBUILD_CFLAGS += -Wno-format-invalid-specifier
788 KBUILD_CFLAGS += -Wno-gnu
789 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
790 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
791 # See modpost pattern 2
792 KBUILD_CFLAGS += -mno-global-merge
795 # These warnings generated too much noise in a regular build.
796 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
797 KBUILD_CFLAGS += -Wno-unused-but-set-variable
799 # Warn about unmarked fall-throughs in switch statement.
800 # Disabled for clang while comment to attribute conversion happens and
801 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
802 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
805 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
806 ifdef CONFIG_FRAME_POINTER
807 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
809 # Some targets (ARM with Thumb2, for example), can't be built with frame
810 # pointers. For those, we don't have FUNCTION_TRACER automatically
811 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
812 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
813 # -fomit-frame-pointer with FUNCTION_TRACER.
814 ifndef CONFIG_FUNCTION_TRACER
815 KBUILD_CFLAGS += -fomit-frame-pointer
819 # Initialize all stack variables with a 0xAA pattern.
820 ifdef CONFIG_INIT_STACK_ALL_PATTERN
821 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
824 # Initialize all stack variables with a zero value.
825 ifdef CONFIG_INIT_STACK_ALL_ZERO
826 # Future support for zero initialization is still being debated, see
827 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
828 # renamed or dropped.
829 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
830 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
835 # Workaround for GCC versions < 5.0
836 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
837 ifdef CONFIG_CC_IS_GCC
838 DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
841 ifdef CONFIG_DEBUG_INFO
843 ifdef CONFIG_DEBUG_INFO_SPLIT
844 DEBUG_CFLAGS += -gsplit-dwarf
849 ifneq ($(LLVM_IAS),1)
850 KBUILD_AFLAGS += -Wa,-gdwarf-2
853 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
854 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
855 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
856 DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
859 ifdef CONFIG_DEBUG_INFO_REDUCED
860 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
861 $(call cc-option,-fno-var-tracking)
864 ifdef CONFIG_DEBUG_INFO_COMPRESSED
865 DEBUG_CFLAGS += -gz=zlib
866 KBUILD_AFLAGS += -gz=zlib
867 KBUILD_LDFLAGS += --compress-debug-sections=zlib
870 endif # CONFIG_DEBUG_INFO
872 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
875 ifdef CONFIG_FUNCTION_TRACER
876 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
877 CC_FLAGS_FTRACE += -mrecord-mcount
878 ifdef CONFIG_HAVE_NOP_MCOUNT
879 ifeq ($(call cc-option-yn, -mnop-mcount),y)
880 CC_FLAGS_FTRACE += -mnop-mcount
881 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
885 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
886 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
888 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
889 ifdef CONFIG_HAVE_C_RECORDMCOUNT
890 BUILD_C_RECORDMCOUNT := y
891 export BUILD_C_RECORDMCOUNT
894 ifdef CONFIG_HAVE_FENTRY
895 ifeq ($(call cc-option-yn, -mfentry),y)
896 CC_FLAGS_FTRACE += -mfentry
897 CC_FLAGS_USING += -DCC_USING_FENTRY
900 export CC_FLAGS_FTRACE
901 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
902 KBUILD_AFLAGS += $(CC_FLAGS_USING)
905 # We trigger additional mismatches with less inlining
906 ifdef CONFIG_DEBUG_SECTION_MISMATCH
907 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
910 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
911 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
912 LDFLAGS_vmlinux += --gc-sections
915 ifdef CONFIG_SHADOW_CALL_STACK
916 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
917 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
921 ifdef CONFIG_LTO_CLANG
922 ifdef CONFIG_LTO_CLANG_THIN
923 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
924 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache
926 CC_FLAGS_LTO := -flto
928 CC_FLAGS_LTO += -fvisibility=hidden
930 # Limit inlining across translation units to reduce binary size
931 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
935 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
936 KBUILD_AFLAGS += -fno-lto
940 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
941 KBUILD_CFLAGS += -falign-functions=32
944 # arch Makefile may override CC so keep this after arch Makefile is included
945 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
947 # warn about C99 declaration after statement
948 KBUILD_CFLAGS += -Wdeclaration-after-statement
950 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
951 KBUILD_CFLAGS += -Wvla
953 # disable pointer signed / unsigned warnings in gcc 4.0
954 KBUILD_CFLAGS += -Wno-pointer-sign
956 # disable stringop warnings in gcc 8+
957 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
959 # We'll want to enable this eventually, but it's not going away for 5.7 at least
960 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
961 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
962 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
964 # Another good warning that we'll want to enable eventually
965 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
967 # Enabled with W=2, disabled by default as noisy
968 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
970 # disable invalid "can't wrap" optimizations for signed / pointers
971 KBUILD_CFLAGS += -fno-strict-overflow
973 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
974 KBUILD_CFLAGS += -fno-stack-check
976 # conserve stack if available
977 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
979 # Prohibit date/time macros, which would make the build non-deterministic
980 KBUILD_CFLAGS += -Werror=date-time
982 # enforce correct pointer usage
983 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
985 # Require designated initializers for all marked structures
986 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
988 # change __FILE__ to the relative path from the srctree
989 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
991 # include additional Makefiles when needed
992 include-y := scripts/Makefile.extrawarn
993 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
994 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
995 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
996 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
997 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
999 include $(addprefix $(srctree)/, $(include-y))
1001 # scripts/Makefile.gcc-plugins is intentionally included last.
1002 # Do not add $(call cc-option,...) below this line. When you build the kernel
1003 # from the clean source tree, the GCC plugins do not exist at this point.
1005 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1006 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1007 KBUILD_AFLAGS += $(KAFLAGS)
1008 KBUILD_CFLAGS += $(KCFLAGS)
1010 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1011 LDFLAGS_vmlinux += --build-id=sha1
1013 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1014 LDFLAGS_vmlinux += $(call ld-option, -X,)
1017 ifeq ($(CONFIG_RELR),y)
1018 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
1021 # We never want expected sections to be placed heuristically by the
1022 # linker. All sections should be explicitly named in the linker script.
1023 ifdef CONFIG_LD_ORPHAN_WARN
1024 LDFLAGS_vmlinux += --orphan-handling=warn
1027 # Align the bit size of userspace programs with the kernel
1028 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1029 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1031 # make the checker run with the right architecture
1032 CHECKFLAGS += --arch=$(ARCH)
1034 # insure the checker run with the right endianness
1035 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1037 # the checker needs the correct machine size
1038 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1040 # Default kernel image to build when no specific target is given.
1041 # KBUILD_IMAGE may be overruled on the command line or
1042 # set in the environment
1043 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1044 # this default value
1045 export KBUILD_IMAGE ?= vmlinux
1048 # INSTALL_PATH specifies where to place the updated kernel and system map
1049 # images. Default is /boot, but you can set it to other values
1050 export INSTALL_PATH ?= /boot
1053 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1054 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1055 # an argument if needed. Otherwise it defaults to the kernel install path
1057 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1060 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1061 # relocations required by build roots. This is not defined in the
1062 # makefile but the argument can be passed to make if needed.
1065 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1069 # INSTALL_MOD_STRIP, if defined, will cause modules to be
1070 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1071 # the default option --strip-debug will be used. Otherwise,
1072 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1074 ifdef INSTALL_MOD_STRIP
1075 ifeq ($(INSTALL_MOD_STRIP),1)
1076 mod_strip_cmd = $(STRIP) --strip-debug
1078 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1079 endif # INSTALL_MOD_STRIP=1
1081 mod_strip_cmd = true
1082 endif # INSTALL_MOD_STRIP
1083 export mod_strip_cmd
1085 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1086 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1087 # or CONFIG_MODULE_COMPRESS_XZ.
1089 mod_compress_cmd = true
1090 ifdef CONFIG_MODULE_COMPRESS
1091 ifdef CONFIG_MODULE_COMPRESS_GZIP
1092 mod_compress_cmd = $(KGZIP) -n -f
1093 endif # CONFIG_MODULE_COMPRESS_GZIP
1094 ifdef CONFIG_MODULE_COMPRESS_XZ
1095 mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f
1096 endif # CONFIG_MODULE_COMPRESS_XZ
1097 endif # CONFIG_MODULE_COMPRESS
1098 export mod_compress_cmd
1100 ifdef CONFIG_MODULE_SIG_ALL
1101 $(eval $(call config_filename,MODULE_SIG_KEY))
1103 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1109 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1111 has_libelf = $(call try-run,\
1112 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1114 ifdef CONFIG_STACK_VALIDATION
1115 ifeq ($(has_libelf),1)
1116 objtool_target := tools/objtool FORCE
1118 SKIP_STACK_VALIDATION := 1
1119 export SKIP_STACK_VALIDATION
1123 PHONY += resolve_btfids_clean
1125 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1127 # tools/bpf/resolve_btfids directory might not exist
1128 # in output directory, skip its clean in that case
1129 resolve_btfids_clean:
1130 ifneq ($(wildcard $(resolve_btfids_O)),)
1131 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1135 ifdef CONFIG_DEBUG_INFO_BTF
1136 ifeq ($(has_libelf),1)
1137 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1139 ERROR_RESOLVE_BTFIDS := 1
1141 endif # CONFIG_DEBUG_INFO_BTF
1146 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1147 export MODORDER := $(extmod-prefix)modules.order
1148 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1150 ifeq ($(KBUILD_EXTMOD),)
1151 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1153 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1154 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1155 $(libs-y) $(libs-m)))
1157 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1158 $(patsubst %/,%,$(filter %/, $(core-) \
1159 $(drivers-) $(libs-))))
1161 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1162 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1163 $(drivers-y) $(drivers-m)))
1165 build-dirs := $(vmlinux-dirs)
1166 clean-dirs := $(vmlinux-alldirs)
1168 # Externally visible symbols (used by link-vmlinux.sh)
1169 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1170 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1171 ifdef CONFIG_MODULES
1172 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1173 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1175 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1177 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1179 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1180 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1181 # used by scripts/Makefile.package
1182 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1184 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1186 # Recurse until adjust_autoksyms.sh is satisfied
1187 PHONY += autoksyms_recursive
1188 ifdef CONFIG_TRIM_UNUSED_KSYMS
1189 # For the kernel to actually contain only the needed exported symbols,
1190 # we have to build modules as well to determine what those symbols are.
1191 # (this can be evaluated only once include/config/auto.conf has been included)
1194 autoksyms_recursive: descend modules.order
1195 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1196 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1199 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1201 quiet_cmd_autoksyms_h = GEN $@
1202 cmd_autoksyms_h = mkdir -p $(dir $@); \
1203 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1206 $(call cmd,autoksyms_h)
1208 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1210 # Final link of vmlinux with optional arch pass after final link
1211 cmd_link-vmlinux = \
1212 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1213 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1215 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1216 +$(call if_changed,link-vmlinux)
1220 # The actual objects are generated when descending,
1221 # make sure no implicit rule kicks in
1222 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1224 filechk_kernel.release = \
1225 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1227 # Store (new) KERNELRELEASE string in include/config/kernel.release
1228 include/config/kernel.release: FORCE
1229 $(call filechk,kernel.release)
1231 # Additional helpers built in scripts/
1232 # Carefully list dependencies so we do not try to build scripts twice
1235 scripts: scripts_basic scripts_dtc
1236 $(Q)$(MAKE) $(build)=$(@)
1238 # Things we need to do before we recursively start building the kernel
1239 # or the modules are listed in "prepare".
1240 # A multi level approach is used. prepareN is processed before prepareN-1.
1241 # archprepare is used in arch Makefiles and when processed asm symlink,
1242 # version.h and scripts_basic is processed / created.
1244 PHONY += prepare archprepare
1246 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1247 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1248 include/generated/autoconf.h
1250 prepare0: archprepare
1251 $(Q)$(MAKE) $(build)=scripts/mod
1252 $(Q)$(MAKE) $(build)=.
1254 # All the preparing..
1255 prepare: prepare0 prepare-objtool prepare-resolve_btfids
1257 # Support for using generic headers in asm-generic
1258 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1260 PHONY += asm-generic uapi-asm-generic
1261 asm-generic: uapi-asm-generic
1262 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1263 generic=include/asm-generic
1265 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1266 generic=include/uapi/asm-generic
1268 PHONY += prepare-objtool prepare-resolve_btfids
1269 prepare-objtool: $(objtool_target)
1270 ifeq ($(SKIP_STACK_VALIDATION),1)
1271 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
1272 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1275 ifdef CONFIG_UNWINDER_ORC
1276 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1279 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1283 prepare-resolve_btfids: $(resolve_btfids_target)
1284 ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1285 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1288 # Generate some files
1289 # ---------------------------------------------------------------------------
1291 # KERNELRELEASE can change from a few different places, meaning version.h
1292 # needs to be updated, so this check is forced on all builds
1295 define filechk_utsrelease.h
1296 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1297 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1300 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1303 define filechk_version.h
1304 if [ $(SUBLEVEL) -gt 255 ]; then \
1305 echo \#define LINUX_VERSION_CODE $(shell \
1306 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1308 echo \#define LINUX_VERSION_CODE $(shell \
1309 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1311 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1312 ((c) > 255 ? 255 : (c)))'; \
1313 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1314 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1315 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1318 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1319 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1321 $(call filechk,version.h)
1323 include/generated/utsrelease.h: include/config/kernel.release FORCE
1324 $(call filechk,utsrelease.h)
1328 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1329 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1331 # ---------------------------------------------------------------------------
1334 #Default location for installed headers
1335 export INSTALL_HDR_PATH = $(objtree)/usr
1337 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1338 cmd_headers_install = \
1339 mkdir -p $(INSTALL_HDR_PATH); \
1340 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1341 usr/include $(INSTALL_HDR_PATH)
1343 PHONY += headers_install
1344 headers_install: headers
1345 $(call cmd,headers_install)
1347 PHONY += archheaders archscripts
1349 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1352 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1353 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1354 $(error Headers not exportable for the $(SRCARCH) architecture))
1355 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1356 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1358 # Deprecated. It is no-op now.
1359 PHONY += headers_check
1361 @echo >&2 "=================== WARNING ==================="
1362 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op,"
1363 @echo >&2 "and will be removed after Linux 5.15 release."
1364 @echo >&2 "Please remove headers_check from your scripts."
1365 @echo >&2 "==============================================="
1367 ifdef CONFIG_HEADERS_INSTALL
1371 PHONY += scripts_unifdef
1372 scripts_unifdef: scripts_basic
1373 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1375 # ---------------------------------------------------------------------------
1380 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1383 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1385 PHONY += kselftest-merge
1387 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1388 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1389 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1390 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1392 # ---------------------------------------------------------------------------
1395 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1396 dtstree := arch/$(SRCARCH)/boot/dts
1401 %.dtb: include/config/kernel.release scripts_dtc
1402 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1404 %.dtbo: include/config/kernel.release scripts_dtc
1405 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1407 PHONY += dtbs dtbs_install dtbs_check
1408 dtbs: include/config/kernel.release scripts_dtc
1409 $(Q)$(MAKE) $(build)=$(dtstree)
1411 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1413 dtbs: dt_binding_check
1419 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1421 ifdef CONFIG_OF_EARLY_FLATTREE
1427 PHONY += scripts_dtc
1428 scripts_dtc: scripts_basic
1429 $(Q)$(MAKE) $(build)=scripts/dtc
1431 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1432 export CHECK_DT_BINDING=y
1435 PHONY += dt_binding_check
1436 dt_binding_check: scripts_dtc
1437 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1439 # ---------------------------------------------------------------------------
1442 ifdef CONFIG_MODULES
1444 # By default, build modules as well
1448 # When we're building modules with modversions, we need to consider
1449 # the built-in objects during the descend as well, in order to
1450 # make sure the checksums are up to date before we record them.
1451 ifdef CONFIG_MODVERSIONS
1457 # A module can be listed more than once in obj-m resulting in
1458 # duplicate lines in modules.order files. Those are removed
1459 # using awk while concatenating to the final file.
1462 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1463 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1465 PHONY += modules_check
1466 modules_check: modules.order
1467 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1469 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1471 modules.order: $(subdir-modorder) FORCE
1472 $(call if_changed,modules_order)
1474 targets += modules.order
1476 # Target to prepare building external modules
1477 PHONY += modules_prepare
1478 modules_prepare: prepare
1479 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1481 # Target to install modules
1482 PHONY += modules_install
1483 modules_install: _modinst_ _modinst_post
1487 @rm -rf $(MODLIB)/kernel
1488 @rm -f $(MODLIB)/source
1489 @mkdir -p $(MODLIB)/kernel
1490 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1491 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1492 rm -f $(MODLIB)/build ; \
1493 ln -s $(CURDIR) $(MODLIB)/build ; \
1495 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1496 @cp -f modules.builtin $(MODLIB)/
1497 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1498 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1500 # This depmod is only for convenience to give the initial
1501 # boot a modules.dep even before / is mounted read-write. However the
1502 # boot script depmod is the master version.
1503 PHONY += _modinst_post
1504 _modinst_post: _modinst_
1507 ifeq ($(CONFIG_MODULE_SIG), y)
1508 PHONY += modules_sign
1510 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1513 else # CONFIG_MODULES
1515 # Modules not configured
1516 # ---------------------------------------------------------------------------
1518 PHONY += modules modules_install
1519 modules modules_install:
1521 @echo >&2 "The present kernel configuration has modules disabled."
1522 @echo >&2 "Type 'make config' and enable loadable module support."
1523 @echo >&2 "Then build a kernel with module support enabled."
1527 endif # CONFIG_MODULES
1530 # Cleaning is done on three levels.
1531 # make clean Delete most generated files
1532 # Leave enough to build external modules
1533 # make mrproper Delete the current configuration, and all generated files
1534 # make distclean Remove editor backup files, patch leftover files and the like
1536 # Directories & files removed with 'make clean'
1537 CLEAN_FILES += include/ksym vmlinux.symvers \
1538 modules.builtin modules.builtin.modinfo modules.nsdeps \
1539 compile_commands.json .thinlto-cache
1541 # Directories & files removed with 'make mrproper'
1542 MRPROPER_FILES += include/config include/generated \
1543 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1544 debian snap tar-install \
1545 .config .config.old .version \
1547 signing_key.pem signing_key.priv signing_key.x509 \
1548 x509.genkey extra_certificates signing_key.x509.keyid \
1549 signing_key.x509.signer vmlinux-gdb.py \
1552 # Directories & files removed with 'make distclean'
1553 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1555 # clean - Delete most, but leave enough to build external modules
1557 clean: rm-files := $(CLEAN_FILES)
1559 PHONY += archclean vmlinuxclean
1562 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1563 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1565 clean: archclean vmlinuxclean resolve_btfids_clean
1567 # mrproper - Delete all generated files, including .config
1569 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1570 mrproper-dirs := $(addprefix _mrproper_,scripts)
1572 PHONY += $(mrproper-dirs) mrproper
1574 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1576 mrproper: clean $(mrproper-dirs)
1581 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1587 @find $(srctree) $(RCS_FIND_IGNORE) \
1588 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1589 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1590 -o -name 'core' \) \
1591 -type f -print | xargs rm -f
1594 # Packaging of the kernel to various formats
1595 # ---------------------------------------------------------------------------
1598 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1599 %pkg: include/config/kernel.release FORCE
1600 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1602 # Brief documentation of the typical targets used
1603 # ---------------------------------------------------------------------------
1605 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1606 boards := $(sort $(notdir $(boards)))
1607 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1608 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1612 @echo 'Cleaning targets:'
1613 @echo ' clean - Remove most generated files but keep the config and'
1614 @echo ' enough build support to build external modules'
1615 @echo ' mrproper - Remove all generated files + config + various backup files'
1616 @echo ' distclean - mrproper + remove editor backup and patch files'
1618 @echo 'Configuration targets:'
1619 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1621 @echo 'Other generic targets:'
1622 @echo ' all - Build all targets marked with [*]'
1623 @echo '* vmlinux - Build the bare kernel'
1624 @echo '* modules - Build all modules'
1625 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1626 @echo ' dir/ - Build all files in dir and below'
1627 @echo ' dir/file.[ois] - Build specified target only'
1628 @echo ' dir/file.ll - Build the LLVM assembly file'
1629 @echo ' (requires compiler support for LLVM assembly generation)'
1630 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1631 @echo ' (requires a recent binutils and recent build (System.map))'
1632 @echo ' dir/file.ko - Build module including final link'
1633 @echo ' modules_prepare - Set up for building external modules'
1634 @echo ' tags/TAGS - Generate tags file for editors'
1635 @echo ' cscope - Generate cscope index'
1636 @echo ' gtags - Generate GNU GLOBAL index'
1637 @echo ' kernelrelease - Output the release version string (use with make -s)'
1638 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1639 @echo ' image_name - Output the image name (use with make -s)'
1640 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1641 echo ' (default: $(INSTALL_HDR_PATH))'; \
1643 @echo 'Static analysers:'
1644 @echo ' checkstack - Generate a list of stack hogs'
1645 @echo ' versioncheck - Sanity check on version.h usage'
1646 @echo ' includecheck - Check for duplicate included header files'
1647 @echo ' export_report - List the usages of all exported symbols'
1648 @echo ' headerdep - Detect inclusion cycles in headers'
1649 @echo ' coccicheck - Check with Coccinelle'
1650 @echo ' clang-analyzer - Check with clang static analyzer'
1651 @echo ' clang-tidy - Check with clang-tidy'
1654 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1656 @echo 'Kernel selftest:'
1657 @echo ' kselftest - Build and run kernel selftest'
1658 @echo ' Build, install, and boot kernel before'
1659 @echo ' running kselftest on it'
1660 @echo ' Run as root for full coverage'
1661 @echo ' kselftest-all - Build kernel selftest'
1662 @echo ' kselftest-install - Build and install kernel selftest'
1663 @echo ' kselftest-clean - Remove all generated kselftest files'
1664 @echo ' kselftest-merge - Merge all the config dependencies of'
1665 @echo ' kselftest to existing .config.'
1668 echo 'Devicetree:'; \
1669 echo '* dtbs - Build device tree blobs for enabled boards'; \
1670 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1671 echo ' dt_binding_check - Validate device tree binding documents'; \
1672 echo ' dtbs_check - Validate device tree source files';\
1675 @echo 'Userspace tools targets:'
1676 @echo ' use "make tools/help"'
1677 @echo ' or "cd tools; make help"'
1679 @echo 'Kernel packaging:'
1680 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1682 @echo 'Documentation targets:'
1683 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1685 @echo 'Architecture specific targets ($(SRCARCH)):'
1686 @$(if $(archhelp),$(archhelp),\
1687 echo ' No architecture specific help defined for $(SRCARCH)')
1690 $(foreach b, $(boards), \
1691 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1693 @$(if $(board-dirs), \
1694 $(foreach b, $(board-dirs), \
1695 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1696 printf " %-16s - Show all of the above\\n" help-boards; \
1699 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1700 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1701 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1702 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1703 @echo ' (sparse by default)'
1704 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1705 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1706 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1707 @echo ' 1: warnings which may be relevant and do not occur too often'
1708 @echo ' 2: warnings which occur quite often but may still be relevant'
1709 @echo ' 3: more obscure warnings, can most likely be ignored'
1710 @echo ' Multiple levels can be combined with W=12 or W=123'
1712 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1713 @echo 'For further info see the ./README file'
1716 help-board-dirs := $(addprefix help-,$(board-dirs))
1718 help-boards: $(help-board-dirs)
1720 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1722 $(help-board-dirs): help-%:
1723 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1724 @$(if $(boards-per-dir), \
1725 $(foreach b, $(boards-per-dir), \
1726 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1730 # Documentation targets
1731 # ---------------------------------------------------------------------------
1732 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1733 linkcheckdocs dochelp refcheckdocs
1734 PHONY += $(DOC_TARGETS)
1736 $(Q)$(MAKE) $(build)=Documentation $@
1739 # ---------------------------------------------------------------------------
1741 PHONY += scripts_gdb
1742 scripts_gdb: prepare0
1743 $(Q)$(MAKE) $(build)=scripts/gdb
1744 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1746 ifdef CONFIG_GDB_SCRIPTS
1750 else # KBUILD_EXTMOD
1753 # External module support.
1754 # When building external modules the kernel used as basis is considered
1755 # read-only, and no consistency checks are made and the make
1756 # system is not used on the basis kernel. If updates are required
1757 # in the basis kernel ordinary make commands (without M=...) must
1760 # The following are the only valid targets when building external
1762 # make M=dir clean Delete all automatically generated files
1763 # make M=dir modules Make all modules in specified dir
1764 # make M=dir Same as 'make M=dir modules'
1765 # make M=dir modules_install
1766 # Install the modules built in the module directory
1767 # Assumes install directory is already created
1769 # We are always building only modules.
1773 build-dirs := $(KBUILD_EXTMOD)
1775 modules: $(MODORDER)
1776 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1778 $(MODORDER): descend
1781 PHONY += modules_install
1782 modules_install: _emodinst_ _emodinst_post
1784 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1787 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1788 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1790 PHONY += _emodinst_post
1791 _emodinst_post: _emodinst_
1794 compile_commands.json: $(extmod-prefix)compile_commands.json
1795 PHONY += compile_commands.json
1797 clean-dirs := $(KBUILD_EXTMOD)
1798 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1799 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1803 @echo ' Building external modules.'
1804 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1806 @echo ' modules - default target, build the module(s)'
1807 @echo ' modules_install - install the module'
1808 @echo ' clean - remove generated files in module directory only'
1811 # no-op for external module builds
1812 PHONY += prepare modules_prepare
1814 endif # KBUILD_EXTMOD
1817 # ---------------------------------------------------------------------------
1818 # To build individual files in subdirectories, you can do like this:
1820 # make foo/bar/baz.s
1822 # The supported suffixes for single-target are listed in 'single-targets'
1824 # To build only under specific subdirectories, you can do like this:
1830 # .ko is special because modpost is needed
1831 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1832 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1834 $(single-ko): single_modpost
1836 $(single-no-ko): descend
1839 ifeq ($(KBUILD_EXTMOD),)
1840 # For the single build of in-tree modules, use a temporary file to avoid
1841 # the situation of modules_install installing an invalid modules.order.
1842 MODORDER := .modules.tmp
1845 PHONY += single_modpost
1846 single_modpost: $(single-no-ko) modules_prepare
1847 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1848 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1852 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1854 # trim unrelated directories
1855 build-dirs := $(foreach d, $(build-dirs), \
1856 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1860 ifndef CONFIG_MODULES
1864 # Handle descending into subdirectories listed in $(build-dirs)
1865 # Preset locale variables to speed up the build process. Limit locale
1866 # tweaks to this spot to avoid wrong language settings when running
1867 # make menuconfig etc.
1868 # Error messages still appears in the original language
1869 PHONY += descend $(build-dirs)
1870 descend: $(build-dirs)
1871 $(build-dirs): prepare
1872 $(Q)$(MAKE) $(build)=$@ \
1873 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1874 need-builtin=1 need-modorder=1
1876 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1877 PHONY += $(clean-dirs) clean
1879 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1881 clean: $(clean-dirs)
1883 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1884 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1886 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1887 -o -name '*.dwo' -o -name '*.lst' \
1888 -o -name '*.su' -o -name '*.mod' \
1889 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1890 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1891 -o -name '*.asn1.[ch]' \
1892 -o -name '*.symtypes' -o -name 'modules.order' \
1893 -o -name '.tmp_*.o.*' \
1894 -o -name '*.c.[012]*.*' \
1897 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1899 # Generate tags for editors
1900 # ---------------------------------------------------------------------------
1901 quiet_cmd_tags = GEN $@
1902 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1904 tags TAGS cscope gtags: FORCE
1907 # Script to generate missing namespace dependencies
1908 # ---------------------------------------------------------------------------
1911 nsdeps: export KBUILD_NSDEPS=1
1913 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1916 # ---------------------------------------------------------------------------
1918 quiet_cmd_gen_compile_commands = GEN $@
1919 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1921 $(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1922 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1923 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1924 $(call if_changed,gen_compile_commands)
1926 targets += $(extmod-prefix)compile_commands.json
1928 PHONY += clang-tidy clang-analyzer
1930 ifdef CONFIG_CC_IS_CLANG
1931 quiet_cmd_clang_tools = CHECK $<
1932 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1934 clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
1935 $(call cmd,clang_tools)
1937 clang-tidy clang-analyzer:
1938 @echo "$@ requires CC=clang" >&2
1942 # Scripts to check various things for consistency
1943 # ---------------------------------------------------------------------------
1945 PHONY += includecheck versioncheck coccicheck export_report
1948 find $(srctree)/* $(RCS_FIND_IGNORE) \
1949 -name '*.[hcS]' -type f -print | sort \
1950 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1953 find $(srctree)/* $(RCS_FIND_IGNORE) \
1954 -name '*.[hcS]' -type f -print | sort \
1955 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1958 $(Q)$(BASH) $(srctree)/scripts/$@
1961 $(PERL) $(srctree)/scripts/export_report.pl
1963 PHONY += checkstack kernelrelease kernelversion image_name
1965 # UML needs a little special treatment here. It wants to use the host
1966 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1967 # else wants $(ARCH), including people doing cross-builds, which means
1968 # that $(SUBARCH) doesn't work here.
1970 CHECKSTACK_ARCH := $(SUBARCH)
1972 CHECKSTACK_ARCH := $(ARCH)
1975 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1976 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1979 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1982 @echo $(KERNELVERSION)
1985 @echo $(KBUILD_IMAGE)
1987 # Clear a bunch of variables before executing the submake
1989 ifeq ($(quiet),silent_)
1994 $(Q)mkdir -p $(objtree)/tools
1995 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1998 $(Q)mkdir -p $(objtree)/tools
1999 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
2001 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2002 cmd_rmfiles = rm -rf $(rm-files)
2004 # Run depmod only if we have System.map and depmod is executable
2005 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
2006 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
2009 # read saved command lines for existing targets
2010 existing-targets := $(wildcard $(sort $(targets)))
2012 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2014 endif # config-build
2016 endif # need-sub-make
2021 # Declare the contents of the PHONY variable as phony. We keep that
2022 # information in a variable so we can use it in if_changed and friends.