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 = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1))
579 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
580 ifneq ($(CROSS_COMPILE),)
581 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
584 CLANG_FLAGS += -integrated-as
586 CLANG_FLAGS += -no-integrated-as
587 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
588 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
590 CLANG_FLAGS += -Werror=unknown-warning-option
591 KBUILD_CFLAGS += $(CLANG_FLAGS)
592 KBUILD_AFLAGS += $(CLANG_FLAGS)
596 # Include this also for config targets because some architectures need
597 # cc-cross-prefix to determine CROSS_COMPILE.
599 include $(srctree)/scripts/Makefile.compiler
603 # ===========================================================================
604 # *config targets only - make sure prerequisites are updated, and descend
605 # in scripts/kconfig to make the *config target
607 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
608 # KBUILD_DEFCONFIG may point out an alternative default configuration
609 # used for 'make defconfig'
610 include $(srctree)/arch/$(SRCARCH)/Makefile
611 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
613 config: outputmakefile scripts_basic FORCE
614 $(Q)$(MAKE) $(build)=scripts/kconfig $@
616 %config: outputmakefile scripts_basic FORCE
617 $(Q)$(MAKE) $(build)=scripts/kconfig $@
620 # ===========================================================================
621 # Build targets only - this includes vmlinux, arch specific targets, clean
622 # targets and others. In general all targets except *config targets.
624 # If building an external module we do not care about the all: rule
625 # but instead __all depend on modules
627 ifeq ($(KBUILD_EXTMOD),)
633 # Decide whether to build built-in, modular, or both.
634 # Normally, just do built-in.
639 # If we have only "make modules", don't compile built-in objects.
640 ifeq ($(MAKECMDGOALS),modules)
644 # If we have "make <whatever> modules", compile modules
645 # in addition to whatever we do anyway.
646 # Just "make" or "make all" shall build modules as well
648 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
652 ifeq ($(MAKECMDGOALS),)
656 export KBUILD_MODULES KBUILD_BUILTIN
659 include include/config/auto.conf
662 ifeq ($(KBUILD_EXTMOD),)
663 # Objects we will link into vmlinux / subdirs we need to visit
665 drivers-y := drivers/ sound/
666 drivers-$(CONFIG_SAMPLES) += samples/
667 drivers-$(CONFIG_NET) += net/
670 endif # KBUILD_EXTMOD
672 # The all: target is the default when no target is given on the
674 # This allow a user to issue only 'make' to build a kernel including modules
675 # Defaults to vmlinux, but the arch makefile usually adds further targets
678 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
679 $(call cc-option,-fno-tree-loop-im) \
680 $(call cc-disable-warning,maybe-uninitialized,)
683 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
684 ifdef CONFIG_FUNCTION_TRACER
685 CC_FLAGS_FTRACE := -pg
688 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
689 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
690 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
691 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
692 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
693 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
694 export RETPOLINE_CFLAGS
695 export RETPOLINE_VDSO_CFLAGS
697 include $(srctree)/arch/$(SRCARCH)/Makefile
700 ifdef may-sync-config
701 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
702 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
703 # because some architectures define CROSS_COMPILE there.
704 include include/config/auto.conf.cmd
708 @echo >&2 '*** Configuration file "$@" not found!'
710 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
711 @echo >&2 '*** "make menuconfig" or "make xconfig").'
715 # The actual configuration files used during the build are stored in
716 # include/generated/ and include/config/. Update them if .config is newer than
717 # include/config/auto.conf (which mirrors .config).
719 # This exploits the 'multi-target pattern rule' trick.
720 # The syncconfig should be executed only once to make all the targets.
721 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
722 quiet_cmd_syncconfig = SYNC $@
723 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig
725 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
726 +$(call cmd,syncconfig)
727 else # !may-sync-config
728 # External modules and some install targets need include/generated/autoconf.h
729 # and include/config/auto.conf but do not care if they are up-to-date.
730 # Use auto.conf to trigger the test
731 PHONY += include/config/auto.conf
733 include/config/auto.conf:
734 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
736 echo >&2 " ERROR: Kernel configuration is invalid."; \
737 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
738 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
742 endif # may-sync-config
745 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
746 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
747 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
748 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
749 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
751 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
753 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
755 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
759 # Tell gcc to never replace conditional load with a non-conditional one
760 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
761 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
763 ifdef CONFIG_READABLE_ASM
764 # Disable optimizations that make assembler listings hard to read.
765 # reorder blocks reorders the control in the function
766 # ipa clone creates specialized cloned functions
767 # partial inlining inlines only parts of functions
768 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
769 $(call cc-option,-fno-ipa-cp-clone,) \
770 $(call cc-option,-fno-partial-inlining)
773 ifneq ($(CONFIG_FRAME_WARN),0)
774 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
777 stackp-flags-y := -fno-stack-protector
778 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
779 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
781 KBUILD_CFLAGS += $(stackp-flags-y)
783 ifdef CONFIG_CC_IS_CLANG
784 KBUILD_CPPFLAGS += -Qunused-arguments
785 KBUILD_CFLAGS += -Wno-format-invalid-specifier
786 KBUILD_CFLAGS += -Wno-gnu
787 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
788 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
789 # See modpost pattern 2
790 KBUILD_CFLAGS += -mno-global-merge
793 # These warnings generated too much noise in a regular build.
794 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
795 KBUILD_CFLAGS += -Wno-unused-but-set-variable
797 # Warn about unmarked fall-throughs in switch statement.
798 # Disabled for clang while comment to attribute conversion happens and
799 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
800 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
803 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
804 ifdef CONFIG_FRAME_POINTER
805 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
807 # Some targets (ARM with Thumb2, for example), can't be built with frame
808 # pointers. For those, we don't have FUNCTION_TRACER automatically
809 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
810 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
811 # -fomit-frame-pointer with FUNCTION_TRACER.
812 ifndef CONFIG_FUNCTION_TRACER
813 KBUILD_CFLAGS += -fomit-frame-pointer
817 # Initialize all stack variables with a 0xAA pattern.
818 ifdef CONFIG_INIT_STACK_ALL_PATTERN
819 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
822 # Initialize all stack variables with a zero value.
823 ifdef CONFIG_INIT_STACK_ALL_ZERO
824 # Future support for zero initialization is still being debated, see
825 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
826 # renamed or dropped.
827 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
828 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
831 # While VLAs have been removed, GCC produces unreachable stack probes
832 # for the randomize_kstack_offset feature. Disable it for all compilers.
833 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
837 # Workaround for GCC versions < 5.0
838 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
839 ifdef CONFIG_CC_IS_GCC
840 DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
843 ifdef CONFIG_DEBUG_INFO
845 ifdef CONFIG_DEBUG_INFO_SPLIT
846 DEBUG_CFLAGS += -gsplit-dwarf
851 ifneq ($(LLVM_IAS),1)
852 KBUILD_AFLAGS += -Wa,-gdwarf-2
855 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
856 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
857 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
858 DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
861 ifdef CONFIG_DEBUG_INFO_REDUCED
862 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
863 $(call cc-option,-fno-var-tracking)
866 ifdef CONFIG_DEBUG_INFO_COMPRESSED
867 DEBUG_CFLAGS += -gz=zlib
868 KBUILD_AFLAGS += -gz=zlib
869 KBUILD_LDFLAGS += --compress-debug-sections=zlib
872 endif # CONFIG_DEBUG_INFO
874 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
877 ifdef CONFIG_FUNCTION_TRACER
878 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
879 CC_FLAGS_FTRACE += -mrecord-mcount
880 ifdef CONFIG_HAVE_NOP_MCOUNT
881 ifeq ($(call cc-option-yn, -mnop-mcount),y)
882 CC_FLAGS_FTRACE += -mnop-mcount
883 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
887 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
888 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
890 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
891 ifdef CONFIG_HAVE_C_RECORDMCOUNT
892 BUILD_C_RECORDMCOUNT := y
893 export BUILD_C_RECORDMCOUNT
896 ifdef CONFIG_HAVE_FENTRY
897 ifeq ($(call cc-option-yn, -mfentry),y)
898 CC_FLAGS_FTRACE += -mfentry
899 CC_FLAGS_USING += -DCC_USING_FENTRY
902 export CC_FLAGS_FTRACE
903 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
904 KBUILD_AFLAGS += $(CC_FLAGS_USING)
907 # We trigger additional mismatches with less inlining
908 ifdef CONFIG_DEBUG_SECTION_MISMATCH
909 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
912 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
913 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
914 LDFLAGS_vmlinux += --gc-sections
917 ifdef CONFIG_SHADOW_CALL_STACK
918 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
919 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
923 ifdef CONFIG_LTO_CLANG
924 ifdef CONFIG_LTO_CLANG_THIN
925 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
926 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
928 CC_FLAGS_LTO := -flto
930 CC_FLAGS_LTO += -fvisibility=hidden
932 # Limit inlining across translation units to reduce binary size
933 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
937 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
938 KBUILD_AFLAGS += -fno-lto
942 ifdef CONFIG_CFI_CLANG
943 CC_FLAGS_CFI := -fsanitize=cfi \
944 -fsanitize-cfi-cross-dso \
945 -fno-sanitize-cfi-canonical-jump-tables \
946 -fno-sanitize-trap=cfi \
947 -fno-sanitize-blacklist
949 ifdef CONFIG_CFI_PERMISSIVE
950 CC_FLAGS_CFI += -fsanitize-recover=cfi
953 # If LTO flags are filtered out, we must also filter out CFI.
954 CC_FLAGS_LTO += $(CC_FLAGS_CFI)
955 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
959 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
960 KBUILD_CFLAGS += -falign-functions=32
963 # arch Makefile may override CC so keep this after arch Makefile is included
964 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
966 # warn about C99 declaration after statement
967 KBUILD_CFLAGS += -Wdeclaration-after-statement
969 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
970 KBUILD_CFLAGS += -Wvla
972 # disable pointer signed / unsigned warnings in gcc 4.0
973 KBUILD_CFLAGS += -Wno-pointer-sign
975 # disable stringop warnings in gcc 8+
976 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
978 # We'll want to enable this eventually, but it's not going away for 5.7 at least
979 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
980 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
981 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
983 # Another good warning that we'll want to enable eventually
984 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
986 # Enabled with W=2, disabled by default as noisy
987 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
989 # disable invalid "can't wrap" optimizations for signed / pointers
990 KBUILD_CFLAGS += -fno-strict-overflow
992 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
993 KBUILD_CFLAGS += -fno-stack-check
995 # conserve stack if available
996 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
998 # Prohibit date/time macros, which would make the build non-deterministic
999 KBUILD_CFLAGS += -Werror=date-time
1001 # enforce correct pointer usage
1002 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
1004 # Require designated initializers for all marked structures
1005 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1007 # change __FILE__ to the relative path from the srctree
1008 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1010 # include additional Makefiles when needed
1011 include-y := scripts/Makefile.extrawarn
1012 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1013 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1014 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1015 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1016 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1018 include $(addprefix $(srctree)/, $(include-y))
1020 # scripts/Makefile.gcc-plugins is intentionally included last.
1021 # Do not add $(call cc-option,...) below this line. When you build the kernel
1022 # from the clean source tree, the GCC plugins do not exist at this point.
1024 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1025 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1026 KBUILD_AFLAGS += $(KAFLAGS)
1027 KBUILD_CFLAGS += $(KCFLAGS)
1029 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1030 LDFLAGS_vmlinux += --build-id=sha1
1032 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1033 LDFLAGS_vmlinux += $(call ld-option, -X,)
1036 ifeq ($(CONFIG_RELR),y)
1037 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
1040 # We never want expected sections to be placed heuristically by the
1041 # linker. All sections should be explicitly named in the linker script.
1042 ifdef CONFIG_LD_ORPHAN_WARN
1043 LDFLAGS_vmlinux += --orphan-handling=warn
1046 # Align the bit size of userspace programs with the kernel
1047 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1048 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1050 # make the checker run with the right architecture
1051 CHECKFLAGS += --arch=$(ARCH)
1053 # insure the checker run with the right endianness
1054 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1056 # the checker needs the correct machine size
1057 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1059 # Default kernel image to build when no specific target is given.
1060 # KBUILD_IMAGE may be overruled on the command line or
1061 # set in the environment
1062 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1063 # this default value
1064 export KBUILD_IMAGE ?= vmlinux
1067 # INSTALL_PATH specifies where to place the updated kernel and system map
1068 # images. Default is /boot, but you can set it to other values
1069 export INSTALL_PATH ?= /boot
1072 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1073 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1074 # an argument if needed. Otherwise it defaults to the kernel install path
1076 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1079 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1080 # relocations required by build roots. This is not defined in the
1081 # makefile but the argument can be passed to make if needed.
1084 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1087 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1089 has_libelf = $(call try-run,\
1090 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1092 ifdef CONFIG_STACK_VALIDATION
1093 ifeq ($(has_libelf),1)
1094 objtool_target := tools/objtool FORCE
1096 SKIP_STACK_VALIDATION := 1
1097 export SKIP_STACK_VALIDATION
1101 PHONY += resolve_btfids_clean
1103 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1105 # tools/bpf/resolve_btfids directory might not exist
1106 # in output directory, skip its clean in that case
1107 resolve_btfids_clean:
1108 ifneq ($(wildcard $(resolve_btfids_O)),)
1109 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1113 ifdef CONFIG_DEBUG_INFO_BTF
1114 ifeq ($(has_libelf),1)
1115 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1117 ERROR_RESOLVE_BTFIDS := 1
1119 endif # CONFIG_DEBUG_INFO_BTF
1124 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1125 export MODORDER := $(extmod_prefix)modules.order
1126 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1128 ifeq ($(KBUILD_EXTMOD),)
1129 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1131 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1132 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1133 $(libs-y) $(libs-m)))
1135 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1136 $(patsubst %/,%,$(filter %/, $(core-) \
1137 $(drivers-) $(libs-))))
1139 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1140 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1141 $(drivers-y) $(drivers-m)))
1143 build-dirs := $(vmlinux-dirs)
1144 clean-dirs := $(vmlinux-alldirs)
1146 # Externally visible symbols (used by link-vmlinux.sh)
1147 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1148 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1149 ifdef CONFIG_MODULES
1150 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1151 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1153 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1155 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1157 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1158 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1159 # used by scripts/Makefile.package
1160 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1162 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1164 # Recurse until adjust_autoksyms.sh is satisfied
1165 PHONY += autoksyms_recursive
1166 ifdef CONFIG_TRIM_UNUSED_KSYMS
1167 # For the kernel to actually contain only the needed exported symbols,
1168 # we have to build modules as well to determine what those symbols are.
1169 # (this can be evaluated only once include/config/auto.conf has been included)
1172 autoksyms_recursive: descend modules.order
1173 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1174 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1177 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1179 quiet_cmd_autoksyms_h = GEN $@
1180 cmd_autoksyms_h = mkdir -p $(dir $@); \
1181 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1184 $(call cmd,autoksyms_h)
1186 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1188 # Final link of vmlinux with optional arch pass after final link
1189 cmd_link-vmlinux = \
1190 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1191 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1193 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1194 +$(call if_changed_dep,link-vmlinux)
1198 # The actual objects are generated when descending,
1199 # make sure no implicit rule kicks in
1200 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1202 filechk_kernel.release = \
1203 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1205 # Store (new) KERNELRELEASE string in include/config/kernel.release
1206 include/config/kernel.release: FORCE
1207 $(call filechk,kernel.release)
1209 # Additional helpers built in scripts/
1210 # Carefully list dependencies so we do not try to build scripts twice
1213 scripts: scripts_basic scripts_dtc
1214 $(Q)$(MAKE) $(build)=$(@)
1216 # Things we need to do before we recursively start building the kernel
1217 # or the modules are listed in "prepare".
1218 # A multi level approach is used. prepareN is processed before prepareN-1.
1219 # archprepare is used in arch Makefiles and when processed asm symlink,
1220 # version.h and scripts_basic is processed / created.
1222 PHONY += prepare archprepare
1224 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1225 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1226 include/generated/autoconf.h
1228 prepare0: archprepare
1229 $(Q)$(MAKE) $(build)=scripts/mod
1230 $(Q)$(MAKE) $(build)=.
1232 # All the preparing..
1233 prepare: prepare0 prepare-objtool prepare-resolve_btfids
1235 # Support for using generic headers in asm-generic
1236 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1238 PHONY += asm-generic uapi-asm-generic
1239 asm-generic: uapi-asm-generic
1240 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1241 generic=include/asm-generic
1243 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1244 generic=include/uapi/asm-generic
1246 PHONY += prepare-objtool prepare-resolve_btfids
1247 prepare-objtool: $(objtool_target)
1248 ifeq ($(SKIP_STACK_VALIDATION),1)
1249 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
1250 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1253 ifdef CONFIG_UNWINDER_ORC
1254 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1257 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1261 prepare-resolve_btfids: $(resolve_btfids_target)
1262 ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1263 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1266 # Generate some files
1267 # ---------------------------------------------------------------------------
1269 # KERNELRELEASE can change from a few different places, meaning version.h
1270 # needs to be updated, so this check is forced on all builds
1273 define filechk_utsrelease.h
1274 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1275 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1278 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1281 define filechk_version.h
1282 if [ $(SUBLEVEL) -gt 255 ]; then \
1283 echo \#define LINUX_VERSION_CODE $(shell \
1284 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1286 echo \#define LINUX_VERSION_CODE $(shell \
1287 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1289 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1290 ((c) > 255 ? 255 : (c)))'; \
1291 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1292 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1293 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1296 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1297 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1299 $(call filechk,version.h)
1301 include/generated/utsrelease.h: include/config/kernel.release FORCE
1302 $(call filechk,utsrelease.h)
1306 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1307 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1309 # ---------------------------------------------------------------------------
1312 #Default location for installed headers
1313 export INSTALL_HDR_PATH = $(objtree)/usr
1315 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1316 cmd_headers_install = \
1317 mkdir -p $(INSTALL_HDR_PATH); \
1318 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1319 usr/include $(INSTALL_HDR_PATH)
1321 PHONY += headers_install
1322 headers_install: headers
1323 $(call cmd,headers_install)
1325 PHONY += archheaders archscripts
1327 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1330 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1331 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1332 $(error Headers not exportable for the $(SRCARCH) architecture))
1333 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1334 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1336 # Deprecated. It is no-op now.
1337 PHONY += headers_check
1339 @echo >&2 "=================== WARNING ==================="
1340 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op,"
1341 @echo >&2 "and will be removed after Linux 5.15 release."
1342 @echo >&2 "Please remove headers_check from your scripts."
1343 @echo >&2 "==============================================="
1345 ifdef CONFIG_HEADERS_INSTALL
1349 PHONY += scripts_unifdef
1350 scripts_unifdef: scripts_basic
1351 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1353 # ---------------------------------------------------------------------------
1358 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1361 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1363 PHONY += kselftest-merge
1365 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1366 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1367 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1368 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1370 # ---------------------------------------------------------------------------
1373 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1374 dtstree := arch/$(SRCARCH)/boot/dts
1379 %.dtb: include/config/kernel.release scripts_dtc
1380 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1382 %.dtbo: include/config/kernel.release scripts_dtc
1383 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1385 PHONY += dtbs dtbs_install dtbs_check
1386 dtbs: include/config/kernel.release scripts_dtc
1387 $(Q)$(MAKE) $(build)=$(dtstree)
1389 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1391 dtbs: dt_binding_check
1397 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1399 ifdef CONFIG_OF_EARLY_FLATTREE
1405 PHONY += scripts_dtc
1406 scripts_dtc: scripts_basic
1407 $(Q)$(MAKE) $(build)=scripts/dtc
1409 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1410 export CHECK_DT_BINDING=y
1413 PHONY += dt_binding_check
1414 dt_binding_check: scripts_dtc
1415 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1417 # ---------------------------------------------------------------------------
1420 ifdef CONFIG_MODULES
1422 # By default, build modules as well
1426 # When we're building modules with modversions, we need to consider
1427 # the built-in objects during the descend as well, in order to
1428 # make sure the checksums are up to date before we record them.
1429 ifdef CONFIG_MODVERSIONS
1435 # A module can be listed more than once in obj-m resulting in
1436 # duplicate lines in modules.order files. Those are removed
1437 # using awk while concatenating to the final file.
1440 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1442 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1444 modules.order: $(subdir-modorder) FORCE
1445 $(call if_changed,modules_order)
1447 targets += modules.order
1449 # Target to prepare building external modules
1450 PHONY += modules_prepare
1451 modules_prepare: prepare
1452 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1454 export modules_sign_only :=
1456 ifeq ($(CONFIG_MODULE_SIG),y)
1457 PHONY += modules_sign
1458 modules_sign: modules_install
1461 # modules_sign is a subset of modules_install.
1462 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1463 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1464 modules_sign_only := y
1469 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1470 modinst_pre := __modinst_pre
1473 modules_install: $(modinst_pre)
1474 PHONY += __modinst_pre
1476 @rm -rf $(MODLIB)/kernel
1477 @rm -f $(MODLIB)/source
1478 @mkdir -p $(MODLIB)/kernel
1479 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1480 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1481 rm -f $(MODLIB)/build ; \
1482 ln -s $(CURDIR) $(MODLIB)/build ; \
1484 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1485 @cp -f modules.builtin $(MODLIB)/
1486 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1488 endif # CONFIG_MODULES
1491 # Cleaning is done on three levels.
1492 # make clean Delete most generated files
1493 # Leave enough to build external modules
1494 # make mrproper Delete the current configuration, and all generated files
1495 # make distclean Remove editor backup files, patch leftover files and the like
1497 # Directories & files removed with 'make clean'
1498 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1499 modules.builtin modules.builtin.modinfo modules.nsdeps \
1500 compile_commands.json .thinlto-cache
1502 # Directories & files removed with 'make mrproper'
1503 MRPROPER_FILES += include/config include/generated \
1504 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1505 debian snap tar-install \
1506 .config .config.old .version \
1508 signing_key.pem signing_key.priv signing_key.x509 \
1509 x509.genkey extra_certificates signing_key.x509.keyid \
1510 signing_key.x509.signer vmlinux-gdb.py \
1513 # Directories & files removed with 'make distclean'
1514 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1516 # clean - Delete most, but leave enough to build external modules
1518 clean: rm-files := $(CLEAN_FILES)
1520 PHONY += archclean vmlinuxclean
1523 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1524 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1526 clean: archclean vmlinuxclean resolve_btfids_clean
1528 # mrproper - Delete all generated files, including .config
1530 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1531 mrproper-dirs := $(addprefix _mrproper_,scripts)
1533 PHONY += $(mrproper-dirs) mrproper
1535 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1537 mrproper: clean $(mrproper-dirs)
1542 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1548 @find $(srctree) $(RCS_FIND_IGNORE) \
1549 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1550 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1551 -o -name 'core' \) \
1552 -type f -print | xargs rm -f
1555 # Packaging of the kernel to various formats
1556 # ---------------------------------------------------------------------------
1559 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1560 %pkg: include/config/kernel.release FORCE
1561 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1563 # Brief documentation of the typical targets used
1564 # ---------------------------------------------------------------------------
1566 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1567 boards := $(sort $(notdir $(boards)))
1568 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1569 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1573 @echo 'Cleaning targets:'
1574 @echo ' clean - Remove most generated files but keep the config and'
1575 @echo ' enough build support to build external modules'
1576 @echo ' mrproper - Remove all generated files + config + various backup files'
1577 @echo ' distclean - mrproper + remove editor backup and patch files'
1579 @echo 'Configuration targets:'
1580 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1582 @echo 'Other generic targets:'
1583 @echo ' all - Build all targets marked with [*]'
1584 @echo '* vmlinux - Build the bare kernel'
1585 @echo '* modules - Build all modules'
1586 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1587 @echo ' dir/ - Build all files in dir and below'
1588 @echo ' dir/file.[ois] - Build specified target only'
1589 @echo ' dir/file.ll - Build the LLVM assembly file'
1590 @echo ' (requires compiler support for LLVM assembly generation)'
1591 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1592 @echo ' (requires a recent binutils and recent build (System.map))'
1593 @echo ' dir/file.ko - Build module including final link'
1594 @echo ' modules_prepare - Set up for building external modules'
1595 @echo ' tags/TAGS - Generate tags file for editors'
1596 @echo ' cscope - Generate cscope index'
1597 @echo ' gtags - Generate GNU GLOBAL index'
1598 @echo ' kernelrelease - Output the release version string (use with make -s)'
1599 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1600 @echo ' image_name - Output the image name (use with make -s)'
1601 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1602 echo ' (default: $(INSTALL_HDR_PATH))'; \
1604 @echo 'Static analysers:'
1605 @echo ' checkstack - Generate a list of stack hogs'
1606 @echo ' versioncheck - Sanity check on version.h usage'
1607 @echo ' includecheck - Check for duplicate included header files'
1608 @echo ' export_report - List the usages of all exported symbols'
1609 @echo ' headerdep - Detect inclusion cycles in headers'
1610 @echo ' coccicheck - Check with Coccinelle'
1611 @echo ' clang-analyzer - Check with clang static analyzer'
1612 @echo ' clang-tidy - Check with clang-tidy'
1615 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1617 @echo 'Kernel selftest:'
1618 @echo ' kselftest - Build and run kernel selftest'
1619 @echo ' Build, install, and boot kernel before'
1620 @echo ' running kselftest on it'
1621 @echo ' Run as root for full coverage'
1622 @echo ' kselftest-all - Build kernel selftest'
1623 @echo ' kselftest-install - Build and install kernel selftest'
1624 @echo ' kselftest-clean - Remove all generated kselftest files'
1625 @echo ' kselftest-merge - Merge all the config dependencies of'
1626 @echo ' kselftest to existing .config.'
1629 echo 'Devicetree:'; \
1630 echo '* dtbs - Build device tree blobs for enabled boards'; \
1631 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1632 echo ' dt_binding_check - Validate device tree binding documents'; \
1633 echo ' dtbs_check - Validate device tree source files';\
1636 @echo 'Userspace tools targets:'
1637 @echo ' use "make tools/help"'
1638 @echo ' or "cd tools; make help"'
1640 @echo 'Kernel packaging:'
1641 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1643 @echo 'Documentation targets:'
1644 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1646 @echo 'Architecture specific targets ($(SRCARCH)):'
1647 @$(if $(archhelp),$(archhelp),\
1648 echo ' No architecture specific help defined for $(SRCARCH)')
1651 $(foreach b, $(boards), \
1652 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1654 @$(if $(board-dirs), \
1655 $(foreach b, $(board-dirs), \
1656 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1657 printf " %-16s - Show all of the above\\n" help-boards; \
1660 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1661 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1662 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1663 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1664 @echo ' (sparse by default)'
1665 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1666 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1667 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1668 @echo ' 1: warnings which may be relevant and do not occur too often'
1669 @echo ' 2: warnings which occur quite often but may still be relevant'
1670 @echo ' 3: more obscure warnings, can most likely be ignored'
1671 @echo ' Multiple levels can be combined with W=12 or W=123'
1673 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1674 @echo 'For further info see the ./README file'
1677 help-board-dirs := $(addprefix help-,$(board-dirs))
1679 help-boards: $(help-board-dirs)
1681 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1683 $(help-board-dirs): help-%:
1684 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1685 @$(if $(boards-per-dir), \
1686 $(foreach b, $(boards-per-dir), \
1687 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1691 # Documentation targets
1692 # ---------------------------------------------------------------------------
1693 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1694 linkcheckdocs dochelp refcheckdocs
1695 PHONY += $(DOC_TARGETS)
1697 $(Q)$(MAKE) $(build)=Documentation $@
1700 # ---------------------------------------------------------------------------
1702 PHONY += scripts_gdb
1703 scripts_gdb: prepare0
1704 $(Q)$(MAKE) $(build)=scripts/gdb
1705 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1707 ifdef CONFIG_GDB_SCRIPTS
1711 else # KBUILD_EXTMOD
1714 # External module support.
1715 # When building external modules the kernel used as basis is considered
1716 # read-only, and no consistency checks are made and the make
1717 # system is not used on the basis kernel. If updates are required
1718 # in the basis kernel ordinary make commands (without M=...) must
1721 # The following are the only valid targets when building external
1723 # make M=dir clean Delete all automatically generated files
1724 # make M=dir modules Make all modules in specified dir
1725 # make M=dir Same as 'make M=dir modules'
1726 # make M=dir modules_install
1727 # Install the modules built in the module directory
1728 # Assumes install directory is already created
1730 # We are always building only modules.
1734 build-dirs := $(KBUILD_EXTMOD)
1735 $(MODORDER): descend
1738 compile_commands.json: $(extmod_prefix)compile_commands.json
1739 PHONY += compile_commands.json
1741 clean-dirs := $(KBUILD_EXTMOD)
1742 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1743 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1747 @echo ' Building external modules.'
1748 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1750 @echo ' modules - default target, build the module(s)'
1751 @echo ' modules_install - install the module'
1752 @echo ' clean - remove generated files in module directory only'
1755 # no-op for external module builds
1756 PHONY += prepare modules_prepare
1758 endif # KBUILD_EXTMOD
1760 # ---------------------------------------------------------------------------
1763 PHONY += modules modules_install
1765 ifdef CONFIG_MODULES
1767 modules: modules_check
1768 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1770 PHONY += modules_check
1771 modules_check: $(MODORDER)
1772 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1774 quiet_cmd_depmod = DEPMOD $(MODLIB)
1775 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1779 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1782 else # CONFIG_MODULES
1784 # Modules not configured
1785 # ---------------------------------------------------------------------------
1787 modules modules_install:
1789 @echo >&2 '*** The present kernel configuration has modules disabled.'
1790 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1791 @echo >&2 '*** to enable CONFIG_MODULES.'
1795 endif # CONFIG_MODULES
1798 # ---------------------------------------------------------------------------
1799 # To build individual files in subdirectories, you can do like this:
1801 # make foo/bar/baz.s
1803 # The supported suffixes for single-target are listed in 'single-targets'
1805 # To build only under specific subdirectories, you can do like this:
1811 # .ko is special because modpost is needed
1812 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1813 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1815 $(single-ko): single_modpost
1817 $(single-no-ko): descend
1820 ifeq ($(KBUILD_EXTMOD),)
1821 # For the single build of in-tree modules, use a temporary file to avoid
1822 # the situation of modules_install installing an invalid modules.order.
1823 MODORDER := .modules.tmp
1826 PHONY += single_modpost
1827 single_modpost: $(single-no-ko) modules_prepare
1828 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
1829 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1833 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
1835 # trim unrelated directories
1836 build-dirs := $(foreach d, $(build-dirs), \
1837 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1841 ifndef CONFIG_MODULES
1845 # Handle descending into subdirectories listed in $(build-dirs)
1846 # Preset locale variables to speed up the build process. Limit locale
1847 # tweaks to this spot to avoid wrong language settings when running
1848 # make menuconfig etc.
1849 # Error messages still appears in the original language
1850 PHONY += descend $(build-dirs)
1851 descend: $(build-dirs)
1852 $(build-dirs): prepare
1853 $(Q)$(MAKE) $(build)=$@ \
1854 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1855 need-builtin=1 need-modorder=1
1857 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1858 PHONY += $(clean-dirs) clean
1860 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1862 clean: $(clean-dirs)
1864 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1865 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1867 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1868 -o -name '*.dwo' -o -name '*.lst' \
1869 -o -name '*.su' -o -name '*.mod' \
1870 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1871 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1872 -o -name '*.asn1.[ch]' \
1873 -o -name '*.symtypes' -o -name 'modules.order' \
1874 -o -name '.tmp_*.o.*' \
1875 -o -name '*.c.[012]*.*' \
1878 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1880 # Generate tags for editors
1881 # ---------------------------------------------------------------------------
1882 quiet_cmd_tags = GEN $@
1883 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1885 tags TAGS cscope gtags: FORCE
1888 # Script to generate missing namespace dependencies
1889 # ---------------------------------------------------------------------------
1892 nsdeps: export KBUILD_NSDEPS=1
1894 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1897 # ---------------------------------------------------------------------------
1899 quiet_cmd_gen_compile_commands = GEN $@
1900 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1902 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1903 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1904 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1905 $(call if_changed,gen_compile_commands)
1907 targets += $(extmod_prefix)compile_commands.json
1909 PHONY += clang-tidy clang-analyzer
1911 ifdef CONFIG_CC_IS_CLANG
1912 quiet_cmd_clang_tools = CHECK $<
1913 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1915 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1916 $(call cmd,clang_tools)
1918 clang-tidy clang-analyzer:
1919 @echo "$@ requires CC=clang" >&2
1923 # Scripts to check various things for consistency
1924 # ---------------------------------------------------------------------------
1926 PHONY += includecheck versioncheck coccicheck export_report
1929 find $(srctree)/* $(RCS_FIND_IGNORE) \
1930 -name '*.[hcS]' -type f -print | sort \
1931 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1934 find $(srctree)/* $(RCS_FIND_IGNORE) \
1935 -name '*.[hcS]' -type f -print | sort \
1936 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1939 $(Q)$(BASH) $(srctree)/scripts/$@
1942 $(PERL) $(srctree)/scripts/export_report.pl
1944 PHONY += checkstack kernelrelease kernelversion image_name
1946 # UML needs a little special treatment here. It wants to use the host
1947 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1948 # else wants $(ARCH), including people doing cross-builds, which means
1949 # that $(SUBARCH) doesn't work here.
1951 CHECKSTACK_ARCH := $(SUBARCH)
1953 CHECKSTACK_ARCH := $(ARCH)
1956 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1957 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1960 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1963 @echo $(KERNELVERSION)
1966 @echo $(KBUILD_IMAGE)
1968 # Clear a bunch of variables before executing the submake
1970 ifeq ($(quiet),silent_)
1975 $(Q)mkdir -p $(objtree)/tools
1976 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1979 $(Q)mkdir -p $(objtree)/tools
1980 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1982 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1983 cmd_rmfiles = rm -rf $(rm-files)
1985 # read saved command lines for existing targets
1986 existing-targets := $(wildcard $(sort $(targets)))
1988 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1990 endif # config-build
1992 endif # need-sub-make
1997 # Declare the contents of the PHONY variable as phony. We keep that
1998 # information in a variable so we can use it in if_changed and friends.