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 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
269 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
277 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
278 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
283 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
284 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
289 ifneq ($(KBUILD_EXTMOD),)
293 ifeq ($(KBUILD_EXTMOD),)
294 ifneq ($(filter %config,$(MAKECMDGOALS)),)
296 ifneq ($(words $(MAKECMDGOALS)),1)
302 # We cannot build single targets and the others at the same time
303 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
305 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
310 # For "make -j clean all", "make -j mrproper defconfig all", etc.
311 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
312 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
317 # install and modules_install need also be processed one by one
318 ifneq ($(filter install,$(MAKECMDGOALS)),)
319 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
325 # ===========================================================================
326 # We're called with mixed targets (*config and build targets).
327 # Handle them one by one.
329 PHONY += $(MAKECMDGOALS) __build_one_by_one
331 $(MAKECMDGOALS): __build_one_by_one
336 for i in $(MAKECMDGOALS); do \
337 $(MAKE) -f $(srctree)/Makefile $$i; \
342 include scripts/Kbuild.include
344 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
345 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
346 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
347 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
349 include scripts/subarch.include
351 # Cross compiling and selecting different set of gcc/bin-utils
352 # ---------------------------------------------------------------------------
354 # When performing cross compilation for other architectures ARCH shall be set
355 # to the target architecture. (See arch/* for the possibilities).
356 # ARCH can be set during invocation of make:
358 # Another way is to have ARCH set in the environment.
359 # The default ARCH is the host where make is executed.
361 # CROSS_COMPILE specify the prefix used for all executables used
362 # during compilation. Only gcc and related bin-utils executables
363 # are prefixed with $(CROSS_COMPILE).
364 # CROSS_COMPILE can be set on the command line
365 # make CROSS_COMPILE=ia64-linux-
366 # Alternatively CROSS_COMPILE can be set in the environment.
367 # Default value for CROSS_COMPILE is not to prefix executables
368 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
371 # Architecture as present in compile.h
372 UTS_MACHINE := $(ARCH)
375 # Additional ARCH settings for x86
379 ifeq ($(ARCH),x86_64)
383 # Additional ARCH settings for sparc
384 ifeq ($(ARCH),sparc32)
387 ifeq ($(ARCH),sparc64)
391 # Additional ARCH settings for sh
396 KCONFIG_CONFIG ?= .config
397 export KCONFIG_CONFIG
399 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
400 export KBUILD_DEFCONFIG := defconfig
402 # SHELL used by kbuild
405 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
406 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
407 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
417 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
418 -O2 -fomit-frame-pointer -std=gnu89
419 export KBUILD_USERLDFLAGS :=
421 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
422 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
423 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
424 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
426 # Make variables (CC, etc...)
433 OBJCOPY = llvm-objcopy
434 OBJDUMP = llvm-objdump
435 READELF = llvm-readelf
438 CC = $(CROSS_COMPILE)gcc
439 LD = $(CROSS_COMPILE)ld
440 AR = $(CROSS_COMPILE)ar
441 NM = $(CROSS_COMPILE)nm
442 OBJCOPY = $(CROSS_COMPILE)objcopy
443 OBJDUMP = $(CROSS_COMPILE)objdump
444 READELF = $(CROSS_COMPILE)readelf
445 STRIP = $(CROSS_COMPILE)strip
448 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
452 INSTALLKERNEL := installkernel
466 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
467 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
476 # Use USERINCLUDE when you must reference the UAPI directories only.
478 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
479 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
480 -I$(srctree)/include/uapi \
481 -I$(objtree)/include/generated/uapi \
482 -include $(srctree)/include/linux/compiler-version.h \
483 -include $(srctree)/include/linux/kconfig.h
485 # Use LINUXINCLUDE when you must reference the include/ directory.
486 # Needed to be compatible with the O= option
488 -I$(srctree)/arch/$(SRCARCH)/include \
489 -I$(objtree)/arch/$(SRCARCH)/include/generated \
490 $(if $(building_out_of_srctree),-I$(srctree)/include) \
491 -I$(objtree)/include \
494 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
495 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
496 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
497 -Werror=implicit-function-declaration -Werror=implicit-int \
498 -Werror=return-type -Wno-format-security \
500 KBUILD_CPPFLAGS := -D__KERNEL__
501 KBUILD_AFLAGS_KERNEL :=
502 KBUILD_CFLAGS_KERNEL :=
503 KBUILD_AFLAGS_MODULE := -DMODULE
504 KBUILD_CFLAGS_MODULE := -DMODULE
505 KBUILD_LDFLAGS_MODULE :=
509 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
510 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
511 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
512 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
513 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
515 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
516 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
517 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
518 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
519 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
521 # Files to ignore in find ... statements
523 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
524 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
526 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
527 --exclude CVS --exclude .pc --exclude .hg --exclude .git
529 # ===========================================================================
530 # Rules shared between *config targets and build targets
532 # Basic helpers built in scripts/basic/
533 PHONY += scripts_basic
535 $(Q)$(MAKE) $(build)=scripts/basic
536 $(Q)rm -f .tmp_quiet_recordmcount
538 PHONY += outputmakefile
539 # Before starting out-of-tree build, make sure the source tree is clean.
540 # outputmakefile generates a Makefile in the output directory, if using a
541 # separate output directory. This allows convenient use of make in the
543 # At the same time when output Makefile generated, generate .gitignore to
544 # ignore whole output directory
546 ifdef building_out_of_srctree
547 $(Q)if [ -f $(srctree)/.config -o \
548 -d $(srctree)/include/config -o \
549 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
551 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
552 echo >&2 "*** in $(abs_srctree)";\
556 $(Q)ln -fsn $(srctree) source
557 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
558 $(Q)test -e .gitignore || \
559 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
562 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
563 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
564 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
565 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
566 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1 | sed 's/\#//g')
568 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
569 ifneq ($(CROSS_COMPILE),)
570 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
571 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
572 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
573 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
575 ifneq ($(GCC_TOOLCHAIN),)
576 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
578 ifneq ($(LLVM_IAS),1)
579 CLANG_FLAGS += -no-integrated-as
581 CLANG_FLAGS += -Werror=unknown-warning-option
582 KBUILD_CFLAGS += $(CLANG_FLAGS)
583 KBUILD_AFLAGS += $(CLANG_FLAGS)
588 # ===========================================================================
589 # *config targets only - make sure prerequisites are updated, and descend
590 # in scripts/kconfig to make the *config target
592 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
593 # KBUILD_DEFCONFIG may point out an alternative default configuration
594 # used for 'make defconfig'
595 include arch/$(SRCARCH)/Makefile
596 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
598 config: outputmakefile scripts_basic FORCE
599 $(Q)$(MAKE) $(build)=scripts/kconfig $@
601 %config: outputmakefile scripts_basic FORCE
602 $(Q)$(MAKE) $(build)=scripts/kconfig $@
605 # ===========================================================================
606 # Build targets only - this includes vmlinux, arch specific targets, clean
607 # targets and others. In general all targets except *config targets.
609 # If building an external module we do not care about the all: rule
610 # but instead __all depend on modules
612 ifeq ($(KBUILD_EXTMOD),)
618 # Decide whether to build built-in, modular, or both.
619 # Normally, just do built-in.
624 # If we have only "make modules", don't compile built-in objects.
625 ifeq ($(MAKECMDGOALS),modules)
629 # If we have "make <whatever> modules", compile modules
630 # in addition to whatever we do anyway.
631 # Just "make" or "make all" shall build modules as well
633 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
637 ifeq ($(MAKECMDGOALS),)
641 export KBUILD_MODULES KBUILD_BUILTIN
644 include include/config/auto.conf
647 ifeq ($(KBUILD_EXTMOD),)
648 # Objects we will link into vmlinux / subdirs we need to visit
650 drivers-y := drivers/ sound/
651 drivers-$(CONFIG_SAMPLES) += samples/
652 drivers-$(CONFIG_NET) += net/
655 endif # KBUILD_EXTMOD
657 # The all: target is the default when no target is given on the
659 # This allow a user to issue only 'make' to build a kernel including modules
660 # Defaults to vmlinux, but the arch makefile usually adds further targets
663 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
664 $(call cc-option,-fno-tree-loop-im) \
665 $(call cc-disable-warning,maybe-uninitialized,)
668 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
669 ifdef CONFIG_FUNCTION_TRACER
670 CC_FLAGS_FTRACE := -pg
673 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
674 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
675 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
676 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
677 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
678 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
679 export RETPOLINE_CFLAGS
680 export RETPOLINE_VDSO_CFLAGS
682 include arch/$(SRCARCH)/Makefile
685 ifdef may-sync-config
686 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
687 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
688 # because some architectures define CROSS_COMPILE there.
689 include include/config/auto.conf.cmd
693 @echo >&2 '*** Configuration file "$@" not found!'
695 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
696 @echo >&2 '*** "make menuconfig" or "make xconfig").'
700 # The actual configuration files used during the build are stored in
701 # include/generated/ and include/config/. Update them if .config is newer than
702 # include/config/auto.conf (which mirrors .config).
704 # This exploits the 'multi-target pattern rule' trick.
705 # The syncconfig should be executed only once to make all the targets.
706 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
707 quiet_cmd_syncconfig = SYNC $@
708 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig
710 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
711 +$(call cmd,syncconfig)
712 else # !may-sync-config
713 # External modules and some install targets need include/generated/autoconf.h
714 # and include/config/auto.conf but do not care if they are up-to-date.
715 # Use auto.conf to trigger the test
716 PHONY += include/config/auto.conf
718 include/config/auto.conf:
719 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
721 echo >&2 " ERROR: Kernel configuration is invalid."; \
722 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
723 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
727 endif # may-sync-config
730 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
731 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
732 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
733 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
734 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
736 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
738 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
740 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
744 # Tell gcc to never replace conditional load with a non-conditional one
745 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
746 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
748 ifdef CONFIG_READABLE_ASM
749 # Disable optimizations that make assembler listings hard to read.
750 # reorder blocks reorders the control in the function
751 # ipa clone creates specialized cloned functions
752 # partial inlining inlines only parts of functions
753 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
754 $(call cc-option,-fno-ipa-cp-clone,) \
755 $(call cc-option,-fno-partial-inlining)
758 ifneq ($(CONFIG_FRAME_WARN),0)
759 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
762 stackp-flags-y := -fno-stack-protector
763 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
764 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
766 KBUILD_CFLAGS += $(stackp-flags-y)
768 ifdef CONFIG_CC_IS_CLANG
769 KBUILD_CPPFLAGS += -Qunused-arguments
770 KBUILD_CFLAGS += -Wno-format-invalid-specifier
771 KBUILD_CFLAGS += -Wno-gnu
772 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
773 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
774 # See modpost pattern 2
775 KBUILD_CFLAGS += -mno-global-merge
778 # These warnings generated too much noise in a regular build.
779 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
780 KBUILD_CFLAGS += -Wno-unused-but-set-variable
782 # Warn about unmarked fall-throughs in switch statement.
783 # Disabled for clang while comment to attribute conversion happens and
784 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
785 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
788 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
789 ifdef CONFIG_FRAME_POINTER
790 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
792 # Some targets (ARM with Thumb2, for example), can't be built with frame
793 # pointers. For those, we don't have FUNCTION_TRACER automatically
794 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
795 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
796 # -fomit-frame-pointer with FUNCTION_TRACER.
797 ifndef CONFIG_FUNCTION_TRACER
798 KBUILD_CFLAGS += -fomit-frame-pointer
802 # Initialize all stack variables with a 0xAA pattern.
803 ifdef CONFIG_INIT_STACK_ALL_PATTERN
804 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
807 # Initialize all stack variables with a zero value.
808 ifdef CONFIG_INIT_STACK_ALL_ZERO
809 # Future support for zero initialization is still being debated, see
810 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
811 # renamed or dropped.
812 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
813 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
818 # Workaround for GCC versions < 5.0
819 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
820 ifdef CONFIG_CC_IS_GCC
821 DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
824 ifdef CONFIG_DEBUG_INFO
826 ifdef CONFIG_DEBUG_INFO_SPLIT
827 DEBUG_CFLAGS += -gsplit-dwarf
832 ifneq ($(LLVM_IAS),1)
833 KBUILD_AFLAGS += -Wa,-gdwarf-2
836 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
837 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
838 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
839 DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
842 ifdef CONFIG_DEBUG_INFO_REDUCED
843 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
844 $(call cc-option,-fno-var-tracking)
847 ifdef CONFIG_DEBUG_INFO_COMPRESSED
848 DEBUG_CFLAGS += -gz=zlib
849 KBUILD_AFLAGS += -gz=zlib
850 KBUILD_LDFLAGS += --compress-debug-sections=zlib
853 endif # CONFIG_DEBUG_INFO
855 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
858 ifdef CONFIG_FUNCTION_TRACER
859 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
860 CC_FLAGS_FTRACE += -mrecord-mcount
861 ifdef CONFIG_HAVE_NOP_MCOUNT
862 ifeq ($(call cc-option-yn, -mnop-mcount),y)
863 CC_FLAGS_FTRACE += -mnop-mcount
864 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
868 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
869 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
871 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
872 ifdef CONFIG_HAVE_C_RECORDMCOUNT
873 BUILD_C_RECORDMCOUNT := y
874 export BUILD_C_RECORDMCOUNT
877 ifdef CONFIG_HAVE_FENTRY
878 ifeq ($(call cc-option-yn, -mfentry),y)
879 CC_FLAGS_FTRACE += -mfentry
880 CC_FLAGS_USING += -DCC_USING_FENTRY
883 export CC_FLAGS_FTRACE
884 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
885 KBUILD_AFLAGS += $(CC_FLAGS_USING)
888 # We trigger additional mismatches with less inlining
889 ifdef CONFIG_DEBUG_SECTION_MISMATCH
890 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
893 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
894 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
895 LDFLAGS_vmlinux += --gc-sections
898 ifdef CONFIG_SHADOW_CALL_STACK
899 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
900 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
904 ifdef CONFIG_LTO_CLANG
905 ifdef CONFIG_LTO_CLANG_THIN
906 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
907 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache
909 CC_FLAGS_LTO := -flto
911 CC_FLAGS_LTO += -fvisibility=hidden
913 # Limit inlining across translation units to reduce binary size
914 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
918 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
919 KBUILD_AFLAGS += -fno-lto
923 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
924 KBUILD_CFLAGS += -falign-functions=32
927 # arch Makefile may override CC so keep this after arch Makefile is included
928 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
930 # warn about C99 declaration after statement
931 KBUILD_CFLAGS += -Wdeclaration-after-statement
933 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
934 KBUILD_CFLAGS += -Wvla
936 # disable pointer signed / unsigned warnings in gcc 4.0
937 KBUILD_CFLAGS += -Wno-pointer-sign
939 # disable stringop warnings in gcc 8+
940 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
942 # We'll want to enable this eventually, but it's not going away for 5.7 at least
943 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
944 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
945 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
947 # Another good warning that we'll want to enable eventually
948 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
950 # Enabled with W=2, disabled by default as noisy
951 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
953 # disable invalid "can't wrap" optimizations for signed / pointers
954 KBUILD_CFLAGS += -fno-strict-overflow
956 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
957 KBUILD_CFLAGS += -fno-stack-check
959 # conserve stack if available
960 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
962 # Prohibit date/time macros, which would make the build non-deterministic
963 KBUILD_CFLAGS += -Werror=date-time
965 # enforce correct pointer usage
966 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
968 # Require designated initializers for all marked structures
969 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
971 # change __FILE__ to the relative path from the srctree
972 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
974 # include additional Makefiles when needed
975 include-y := scripts/Makefile.extrawarn
976 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
977 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
978 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
979 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
980 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
982 include $(addprefix $(srctree)/, $(include-y))
984 # scripts/Makefile.gcc-plugins is intentionally included last.
985 # Do not add $(call cc-option,...) below this line. When you build the kernel
986 # from the clean source tree, the GCC plugins do not exist at this point.
988 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
989 KBUILD_CPPFLAGS += $(KCPPFLAGS)
990 KBUILD_AFLAGS += $(KAFLAGS)
991 KBUILD_CFLAGS += $(KCFLAGS)
993 KBUILD_LDFLAGS_MODULE += --build-id=sha1
994 LDFLAGS_vmlinux += --build-id=sha1
996 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
997 LDFLAGS_vmlinux += $(call ld-option, -X,)
1000 ifeq ($(CONFIG_RELR),y)
1001 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
1004 # We never want expected sections to be placed heuristically by the
1005 # linker. All sections should be explicitly named in the linker script.
1006 ifdef CONFIG_LD_ORPHAN_WARN
1007 LDFLAGS_vmlinux += --orphan-handling=warn
1010 # Align the bit size of userspace programs with the kernel
1011 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1012 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1014 # make the checker run with the right architecture
1015 CHECKFLAGS += --arch=$(ARCH)
1017 # insure the checker run with the right endianness
1018 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1020 # the checker needs the correct machine size
1021 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1023 # Default kernel image to build when no specific target is given.
1024 # KBUILD_IMAGE may be overruled on the command line or
1025 # set in the environment
1026 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1027 # this default value
1028 export KBUILD_IMAGE ?= vmlinux
1031 # INSTALL_PATH specifies where to place the updated kernel and system map
1032 # images. Default is /boot, but you can set it to other values
1033 export INSTALL_PATH ?= /boot
1036 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1037 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1038 # an argument if needed. Otherwise it defaults to the kernel install path
1040 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1043 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1044 # relocations required by build roots. This is not defined in the
1045 # makefile but the argument can be passed to make if needed.
1048 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1052 # INSTALL_MOD_STRIP, if defined, will cause modules to be
1053 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1054 # the default option --strip-debug will be used. Otherwise,
1055 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1057 ifdef INSTALL_MOD_STRIP
1058 ifeq ($(INSTALL_MOD_STRIP),1)
1059 mod_strip_cmd = $(STRIP) --strip-debug
1061 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1062 endif # INSTALL_MOD_STRIP=1
1064 mod_strip_cmd = true
1065 endif # INSTALL_MOD_STRIP
1066 export mod_strip_cmd
1068 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1069 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1070 # or CONFIG_MODULE_COMPRESS_XZ.
1072 mod_compress_cmd = true
1073 ifdef CONFIG_MODULE_COMPRESS
1074 ifdef CONFIG_MODULE_COMPRESS_GZIP
1075 mod_compress_cmd = $(KGZIP) -n -f
1076 endif # CONFIG_MODULE_COMPRESS_GZIP
1077 ifdef CONFIG_MODULE_COMPRESS_XZ
1078 mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f
1079 endif # CONFIG_MODULE_COMPRESS_XZ
1080 endif # CONFIG_MODULE_COMPRESS
1081 export mod_compress_cmd
1083 ifdef CONFIG_MODULE_SIG_ALL
1084 $(eval $(call config_filename,MODULE_SIG_KEY))
1086 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1092 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1094 has_libelf = $(call try-run,\
1095 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1097 ifdef CONFIG_STACK_VALIDATION
1098 ifeq ($(has_libelf),1)
1099 objtool_target := tools/objtool FORCE
1101 SKIP_STACK_VALIDATION := 1
1102 export SKIP_STACK_VALIDATION
1106 PHONY += resolve_btfids_clean
1108 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1110 # tools/bpf/resolve_btfids directory might not exist
1111 # in output directory, skip its clean in that case
1112 resolve_btfids_clean:
1113 ifneq ($(wildcard $(resolve_btfids_O)),)
1114 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1118 ifdef CONFIG_DEBUG_INFO_BTF
1119 ifeq ($(has_libelf),1)
1120 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1122 ERROR_RESOLVE_BTFIDS := 1
1124 endif # CONFIG_DEBUG_INFO_BTF
1129 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1130 export MODORDER := $(extmod-prefix)modules.order
1131 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1133 ifeq ($(KBUILD_EXTMOD),)
1134 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1136 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1137 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1138 $(libs-y) $(libs-m)))
1140 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1141 $(patsubst %/,%,$(filter %/, $(core-) \
1142 $(drivers-) $(libs-))))
1144 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1145 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1146 $(drivers-y) $(drivers-m)))
1148 build-dirs := $(vmlinux-dirs)
1149 clean-dirs := $(vmlinux-alldirs)
1151 # Externally visible symbols (used by link-vmlinux.sh)
1152 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1153 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1154 ifdef CONFIG_MODULES
1155 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1156 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1158 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1160 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1162 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1163 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1164 # used by scripts/Makefile.package
1165 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1167 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1169 # Recurse until adjust_autoksyms.sh is satisfied
1170 PHONY += autoksyms_recursive
1171 ifdef CONFIG_TRIM_UNUSED_KSYMS
1172 # For the kernel to actually contain only the needed exported symbols,
1173 # we have to build modules as well to determine what those symbols are.
1174 # (this can be evaluated only once include/config/auto.conf has been included)
1177 autoksyms_recursive: descend modules.order
1178 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1179 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1182 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1184 quiet_cmd_autoksyms_h = GEN $@
1185 cmd_autoksyms_h = mkdir -p $(dir $@); \
1186 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1189 $(call cmd,autoksyms_h)
1191 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1193 # Final link of vmlinux with optional arch pass after final link
1194 cmd_link-vmlinux = \
1195 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1196 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1198 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1199 +$(call if_changed,link-vmlinux)
1203 # The actual objects are generated when descending,
1204 # make sure no implicit rule kicks in
1205 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1207 filechk_kernel.release = \
1208 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1210 # Store (new) KERNELRELEASE string in include/config/kernel.release
1211 include/config/kernel.release: FORCE
1212 $(call filechk,kernel.release)
1214 # Additional helpers built in scripts/
1215 # Carefully list dependencies so we do not try to build scripts twice
1218 scripts: scripts_basic scripts_dtc
1219 $(Q)$(MAKE) $(build)=$(@)
1221 # Things we need to do before we recursively start building the kernel
1222 # or the modules are listed in "prepare".
1223 # A multi level approach is used. prepareN is processed before prepareN-1.
1224 # archprepare is used in arch Makefiles and when processed asm symlink,
1225 # version.h and scripts_basic is processed / created.
1227 PHONY += prepare archprepare
1229 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1230 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1231 include/generated/autoconf.h
1233 prepare0: archprepare
1234 $(Q)$(MAKE) $(build)=scripts/mod
1235 $(Q)$(MAKE) $(build)=.
1237 # All the preparing..
1238 prepare: prepare0 prepare-objtool prepare-resolve_btfids
1240 # Support for using generic headers in asm-generic
1241 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1243 PHONY += asm-generic uapi-asm-generic
1244 asm-generic: uapi-asm-generic
1245 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1246 generic=include/asm-generic
1248 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1249 generic=include/uapi/asm-generic
1251 PHONY += prepare-objtool prepare-resolve_btfids
1252 prepare-objtool: $(objtool_target)
1253 ifeq ($(SKIP_STACK_VALIDATION),1)
1254 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
1255 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1258 ifdef CONFIG_UNWINDER_ORC
1259 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1262 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1266 prepare-resolve_btfids: $(resolve_btfids_target)
1267 ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1268 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1271 # Generate some files
1272 # ---------------------------------------------------------------------------
1274 # KERNELRELEASE can change from a few different places, meaning version.h
1275 # needs to be updated, so this check is forced on all builds
1278 define filechk_utsrelease.h
1279 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1280 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1283 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1286 define filechk_version.h
1287 if [ $(SUBLEVEL) -gt 255 ]; then \
1288 echo \#define LINUX_VERSION_CODE $(shell \
1289 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1291 echo \#define LINUX_VERSION_CODE $(shell \
1292 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1294 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1295 ((c) > 255 ? 255 : (c)))'; \
1296 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1297 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1298 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1301 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1302 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1304 $(call filechk,version.h)
1306 include/generated/utsrelease.h: include/config/kernel.release FORCE
1307 $(call filechk,utsrelease.h)
1311 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1312 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1314 # ---------------------------------------------------------------------------
1317 #Default location for installed headers
1318 export INSTALL_HDR_PATH = $(objtree)/usr
1320 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1321 cmd_headers_install = \
1322 mkdir -p $(INSTALL_HDR_PATH); \
1323 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1324 usr/include $(INSTALL_HDR_PATH)
1326 PHONY += headers_install
1327 headers_install: headers
1328 $(call cmd,headers_install)
1330 PHONY += archheaders archscripts
1332 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1335 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1336 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1337 $(error Headers not exportable for the $(SRCARCH) architecture))
1338 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1339 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1341 # Deprecated. It is no-op now.
1342 PHONY += headers_check
1346 ifdef CONFIG_HEADERS_INSTALL
1350 PHONY += scripts_unifdef
1351 scripts_unifdef: scripts_basic
1352 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1354 # ---------------------------------------------------------------------------
1359 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1362 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1364 PHONY += kselftest-merge
1366 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1367 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1368 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1369 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1371 # ---------------------------------------------------------------------------
1374 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1375 dtstree := arch/$(SRCARCH)/boot/dts
1380 %.dtb: include/config/kernel.release scripts_dtc
1381 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1383 %.dtbo: include/config/kernel.release scripts_dtc
1384 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1386 PHONY += dtbs dtbs_install dtbs_check
1387 dtbs: include/config/kernel.release scripts_dtc
1388 $(Q)$(MAKE) $(build)=$(dtstree)
1390 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1392 dtbs: dt_binding_check
1398 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1400 ifdef CONFIG_OF_EARLY_FLATTREE
1406 PHONY += scripts_dtc
1407 scripts_dtc: scripts_basic
1408 $(Q)$(MAKE) $(build)=scripts/dtc
1410 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1411 export CHECK_DT_BINDING=y
1414 PHONY += dt_binding_check
1415 dt_binding_check: scripts_dtc
1416 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1418 # ---------------------------------------------------------------------------
1421 ifdef CONFIG_MODULES
1423 # By default, build modules as well
1427 # When we're building modules with modversions, we need to consider
1428 # the built-in objects during the descend as well, in order to
1429 # make sure the checksums are up to date before we record them.
1430 ifdef CONFIG_MODVERSIONS
1436 # A module can be listed more than once in obj-m resulting in
1437 # duplicate lines in modules.order files. Those are removed
1438 # using awk while concatenating to the final file.
1441 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1442 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1444 PHONY += modules_check
1445 modules_check: modules.order
1446 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1448 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1450 modules.order: $(subdir-modorder) FORCE
1451 $(call if_changed,modules_order)
1453 targets += modules.order
1455 # Target to prepare building external modules
1456 PHONY += modules_prepare
1457 modules_prepare: prepare
1458 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1460 # Target to install modules
1461 PHONY += modules_install
1462 modules_install: _modinst_ _modinst_post
1466 @rm -rf $(MODLIB)/kernel
1467 @rm -f $(MODLIB)/source
1468 @mkdir -p $(MODLIB)/kernel
1469 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1470 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1471 rm -f $(MODLIB)/build ; \
1472 ln -s $(CURDIR) $(MODLIB)/build ; \
1474 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1475 @cp -f modules.builtin $(MODLIB)/
1476 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1477 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1479 # This depmod is only for convenience to give the initial
1480 # boot a modules.dep even before / is mounted read-write. However the
1481 # boot script depmod is the master version.
1482 PHONY += _modinst_post
1483 _modinst_post: _modinst_
1486 ifeq ($(CONFIG_MODULE_SIG), y)
1487 PHONY += modules_sign
1489 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1492 else # CONFIG_MODULES
1494 # Modules not configured
1495 # ---------------------------------------------------------------------------
1497 PHONY += modules modules_install
1498 modules modules_install:
1500 @echo >&2 "The present kernel configuration has modules disabled."
1501 @echo >&2 "Type 'make config' and enable loadable module support."
1502 @echo >&2 "Then build a kernel with module support enabled."
1506 endif # CONFIG_MODULES
1509 # Cleaning is done on three levels.
1510 # make clean Delete most generated files
1511 # Leave enough to build external modules
1512 # make mrproper Delete the current configuration, and all generated files
1513 # make distclean Remove editor backup files, patch leftover files and the like
1515 # Directories & files removed with 'make clean'
1516 CLEAN_FILES += include/ksym vmlinux.symvers \
1517 modules.builtin modules.builtin.modinfo modules.nsdeps \
1518 compile_commands.json .thinlto-cache
1520 # Directories & files removed with 'make mrproper'
1521 MRPROPER_FILES += include/config include/generated \
1522 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1523 debian snap tar-install \
1524 .config .config.old .version \
1526 signing_key.pem signing_key.priv signing_key.x509 \
1527 x509.genkey extra_certificates signing_key.x509.keyid \
1528 signing_key.x509.signer vmlinux-gdb.py \
1531 # Directories & files removed with 'make distclean'
1532 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1534 # clean - Delete most, but leave enough to build external modules
1536 clean: rm-files := $(CLEAN_FILES)
1538 PHONY += archclean vmlinuxclean
1541 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1542 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1544 clean: archclean vmlinuxclean resolve_btfids_clean
1546 # mrproper - Delete all generated files, including .config
1548 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1549 mrproper-dirs := $(addprefix _mrproper_,scripts)
1551 PHONY += $(mrproper-dirs) mrproper
1553 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1555 mrproper: clean $(mrproper-dirs)
1560 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1566 @find $(srctree) $(RCS_FIND_IGNORE) \
1567 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1568 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1569 -o -name 'core' \) \
1570 -type f -print | xargs rm -f
1573 # Packaging of the kernel to various formats
1574 # ---------------------------------------------------------------------------
1577 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1578 %pkg: include/config/kernel.release FORCE
1579 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1581 # Brief documentation of the typical targets used
1582 # ---------------------------------------------------------------------------
1584 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1585 boards := $(sort $(notdir $(boards)))
1586 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1587 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1591 @echo 'Cleaning targets:'
1592 @echo ' clean - Remove most generated files but keep the config and'
1593 @echo ' enough build support to build external modules'
1594 @echo ' mrproper - Remove all generated files + config + various backup files'
1595 @echo ' distclean - mrproper + remove editor backup and patch files'
1597 @echo 'Configuration targets:'
1598 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1600 @echo 'Other generic targets:'
1601 @echo ' all - Build all targets marked with [*]'
1602 @echo '* vmlinux - Build the bare kernel'
1603 @echo '* modules - Build all modules'
1604 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1605 @echo ' dir/ - Build all files in dir and below'
1606 @echo ' dir/file.[ois] - Build specified target only'
1607 @echo ' dir/file.ll - Build the LLVM assembly file'
1608 @echo ' (requires compiler support for LLVM assembly generation)'
1609 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1610 @echo ' (requires a recent binutils and recent build (System.map))'
1611 @echo ' dir/file.ko - Build module including final link'
1612 @echo ' modules_prepare - Set up for building external modules'
1613 @echo ' tags/TAGS - Generate tags file for editors'
1614 @echo ' cscope - Generate cscope index'
1615 @echo ' gtags - Generate GNU GLOBAL index'
1616 @echo ' kernelrelease - Output the release version string (use with make -s)'
1617 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1618 @echo ' image_name - Output the image name (use with make -s)'
1619 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1620 echo ' (default: $(INSTALL_HDR_PATH))'; \
1622 @echo 'Static analysers:'
1623 @echo ' checkstack - Generate a list of stack hogs'
1624 @echo ' versioncheck - Sanity check on version.h usage'
1625 @echo ' includecheck - Check for duplicate included header files'
1626 @echo ' export_report - List the usages of all exported symbols'
1627 @echo ' headerdep - Detect inclusion cycles in headers'
1628 @echo ' coccicheck - Check with Coccinelle'
1629 @echo ' clang-analyzer - Check with clang static analyzer'
1630 @echo ' clang-tidy - Check with clang-tidy'
1633 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1635 @echo 'Kernel selftest:'
1636 @echo ' kselftest - Build and run kernel selftest'
1637 @echo ' Build, install, and boot kernel before'
1638 @echo ' running kselftest on it'
1639 @echo ' Run as root for full coverage'
1640 @echo ' kselftest-all - Build kernel selftest'
1641 @echo ' kselftest-install - Build and install kernel selftest'
1642 @echo ' kselftest-clean - Remove all generated kselftest files'
1643 @echo ' kselftest-merge - Merge all the config dependencies of'
1644 @echo ' kselftest to existing .config.'
1647 echo 'Devicetree:'; \
1648 echo '* dtbs - Build device tree blobs for enabled boards'; \
1649 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1650 echo ' dt_binding_check - Validate device tree binding documents'; \
1651 echo ' dtbs_check - Validate device tree source files';\
1654 @echo 'Userspace tools targets:'
1655 @echo ' use "make tools/help"'
1656 @echo ' or "cd tools; make help"'
1658 @echo 'Kernel packaging:'
1659 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1661 @echo 'Documentation targets:'
1662 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1664 @echo 'Architecture specific targets ($(SRCARCH)):'
1665 @$(if $(archhelp),$(archhelp),\
1666 echo ' No architecture specific help defined for $(SRCARCH)')
1669 $(foreach b, $(boards), \
1670 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1672 @$(if $(board-dirs), \
1673 $(foreach b, $(board-dirs), \
1674 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1675 printf " %-16s - Show all of the above\\n" help-boards; \
1678 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1679 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1680 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1681 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1682 @echo ' (sparse by default)'
1683 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1684 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1685 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1686 @echo ' 1: warnings which may be relevant and do not occur too often'
1687 @echo ' 2: warnings which occur quite often but may still be relevant'
1688 @echo ' 3: more obscure warnings, can most likely be ignored'
1689 @echo ' Multiple levels can be combined with W=12 or W=123'
1691 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1692 @echo 'For further info see the ./README file'
1695 help-board-dirs := $(addprefix help-,$(board-dirs))
1697 help-boards: $(help-board-dirs)
1699 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1701 $(help-board-dirs): help-%:
1702 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1703 @$(if $(boards-per-dir), \
1704 $(foreach b, $(boards-per-dir), \
1705 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1709 # Documentation targets
1710 # ---------------------------------------------------------------------------
1711 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1712 linkcheckdocs dochelp refcheckdocs
1713 PHONY += $(DOC_TARGETS)
1715 $(Q)$(MAKE) $(build)=Documentation $@
1718 # ---------------------------------------------------------------------------
1720 PHONY += scripts_gdb
1721 scripts_gdb: prepare0
1722 $(Q)$(MAKE) $(build)=scripts/gdb
1723 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1725 ifdef CONFIG_GDB_SCRIPTS
1729 else # KBUILD_EXTMOD
1732 # External module support.
1733 # When building external modules the kernel used as basis is considered
1734 # read-only, and no consistency checks are made and the make
1735 # system is not used on the basis kernel. If updates are required
1736 # in the basis kernel ordinary make commands (without M=...) must
1739 # The following are the only valid targets when building external
1741 # make M=dir clean Delete all automatically generated files
1742 # make M=dir modules Make all modules in specified dir
1743 # make M=dir Same as 'make M=dir modules'
1744 # make M=dir modules_install
1745 # Install the modules built in the module directory
1746 # Assumes install directory is already created
1748 # We are always building only modules.
1752 build-dirs := $(KBUILD_EXTMOD)
1754 modules: $(MODORDER)
1755 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1757 $(MODORDER): descend
1760 PHONY += modules_install
1761 modules_install: _emodinst_ _emodinst_post
1763 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1766 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1767 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1769 PHONY += _emodinst_post
1770 _emodinst_post: _emodinst_
1773 compile_commands.json: $(extmod-prefix)compile_commands.json
1774 PHONY += compile_commands.json
1776 clean-dirs := $(KBUILD_EXTMOD)
1777 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1778 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1782 @echo ' Building external modules.'
1783 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1785 @echo ' modules - default target, build the module(s)'
1786 @echo ' modules_install - install the module'
1787 @echo ' clean - remove generated files in module directory only'
1790 # no-op for external module builds
1791 PHONY += prepare modules_prepare
1793 endif # KBUILD_EXTMOD
1796 # ---------------------------------------------------------------------------
1797 # To build individual files in subdirectories, you can do like this:
1799 # make foo/bar/baz.s
1801 # The supported suffixes for single-target are listed in 'single-targets'
1803 # To build only under specific subdirectories, you can do like this:
1809 # .ko is special because modpost is needed
1810 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1811 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1813 $(single-ko): single_modpost
1815 $(single-no-ko): descend
1818 ifeq ($(KBUILD_EXTMOD),)
1819 # For the single build of in-tree modules, use a temporary file to avoid
1820 # the situation of modules_install installing an invalid modules.order.
1821 MODORDER := .modules.tmp
1824 PHONY += single_modpost
1825 single_modpost: $(single-no-ko) modules_prepare
1826 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1827 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1831 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1833 # trim unrelated directories
1834 build-dirs := $(foreach d, $(build-dirs), \
1835 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1839 ifndef CONFIG_MODULES
1843 # Handle descending into subdirectories listed in $(build-dirs)
1844 # Preset locale variables to speed up the build process. Limit locale
1845 # tweaks to this spot to avoid wrong language settings when running
1846 # make menuconfig etc.
1847 # Error messages still appears in the original language
1848 PHONY += descend $(build-dirs)
1849 descend: $(build-dirs)
1850 $(build-dirs): prepare
1851 $(Q)$(MAKE) $(build)=$@ \
1852 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1853 need-builtin=1 need-modorder=1
1855 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1856 PHONY += $(clean-dirs) clean
1858 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1860 clean: $(clean-dirs)
1862 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1863 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1865 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1866 -o -name '*.dwo' -o -name '*.lst' \
1867 -o -name '*.su' -o -name '*.mod' \
1868 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1869 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1870 -o -name '*.asn1.[ch]' \
1871 -o -name '*.symtypes' -o -name 'modules.order' \
1872 -o -name '.tmp_*.o.*' \
1873 -o -name '*.c.[012]*.*' \
1876 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1878 # Generate tags for editors
1879 # ---------------------------------------------------------------------------
1880 quiet_cmd_tags = GEN $@
1881 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1883 tags TAGS cscope gtags: FORCE
1886 # Script to generate missing namespace dependencies
1887 # ---------------------------------------------------------------------------
1890 nsdeps: export KBUILD_NSDEPS=1
1892 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1895 # ---------------------------------------------------------------------------
1897 quiet_cmd_gen_compile_commands = GEN $@
1898 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1900 $(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1901 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1902 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1903 $(call if_changed,gen_compile_commands)
1905 targets += $(extmod-prefix)compile_commands.json
1907 PHONY += clang-tidy clang-analyzer
1909 ifdef CONFIG_CC_IS_CLANG
1910 quiet_cmd_clang_tools = CHECK $<
1911 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1913 clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
1914 $(call cmd,clang_tools)
1916 clang-tidy clang-analyzer:
1917 @echo "$@ requires CC=clang" >&2
1921 # Scripts to check various things for consistency
1922 # ---------------------------------------------------------------------------
1924 PHONY += includecheck versioncheck coccicheck export_report
1927 find $(srctree)/* $(RCS_FIND_IGNORE) \
1928 -name '*.[hcS]' -type f -print | sort \
1929 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1932 find $(srctree)/* $(RCS_FIND_IGNORE) \
1933 -name '*.[hcS]' -type f -print | sort \
1934 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1937 $(Q)$(BASH) $(srctree)/scripts/$@
1940 $(PERL) $(srctree)/scripts/export_report.pl
1942 PHONY += checkstack kernelrelease kernelversion image_name
1944 # UML needs a little special treatment here. It wants to use the host
1945 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1946 # else wants $(ARCH), including people doing cross-builds, which means
1947 # that $(SUBARCH) doesn't work here.
1949 CHECKSTACK_ARCH := $(SUBARCH)
1951 CHECKSTACK_ARCH := $(ARCH)
1954 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1955 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1958 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1961 @echo $(KERNELVERSION)
1964 @echo $(KBUILD_IMAGE)
1966 # Clear a bunch of variables before executing the submake
1968 ifeq ($(quiet),silent_)
1973 $(Q)mkdir -p $(objtree)/tools
1974 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1977 $(Q)mkdir -p $(objtree)/tools
1978 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1980 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1981 cmd_rmfiles = rm -rf $(rm-files)
1983 # Run depmod only if we have System.map and depmod is executable
1984 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1985 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1988 # read saved command lines for existing targets
1989 existing-targets := $(wildcard $(sort $(targets)))
1991 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1993 endif # config-build
1995 endif # need-sub-make
2000 # Declare the contents of the PHONY variable as phony. We keep that
2001 # information in a variable so we can use it in if_changed and friends.