1 # SPDX-License-Identifier: GPL-2.0
6 NAME = Opossums on Parade
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 $(if $(filter __%, $(MAKECMDGOALS)), \
15 $(error targets prefixed with '__' are only for internal use))
17 # That's our default target when none is given on the command line
21 # We are using a recursive build, so we need to do a little thinking
22 # to get the ordering right.
24 # Most importantly: sub-Makefiles should only ever modify files in
25 # their own directory. If in some directory we have a dependency on
26 # a file in another dir (which doesn't happen often, but it's often
27 # unavoidable when linking the built-in.a targets which finally
28 # turn into vmlinux), we will call a sub make in that other dir, and
29 # after that we are sure that everything which is in that other dir
32 # The only cases where we need to modify files which have global
33 # effects are thus separated out and done before the recursive
34 # descending is started. They are now explicitly listed as the
37 ifneq ($(sub_make_done),1)
39 # Do not use make's built-in rules and variables
40 # (this increases performance and avoids hard-to-debug behaviour)
43 # Avoid funny character set dependencies
47 export LC_COLLATE LC_NUMERIC
49 # Avoid interference with shell env settings
53 # ---------------------------------------------------------------------------
55 # Normally, we echo the whole command before executing it. By making
56 # that echo $($(quiet)$(cmd)), we now have the possibility to set
57 # $(quiet) to choose other forms of output instead, e.g.
59 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
62 # If $(quiet) is empty, the whole command will be printed.
63 # If it is set to "quiet_", only the short version will be printed.
64 # If it is set to "silent_", nothing will be printed at all, since
65 # the variable $(silent_cmd_cc_o_c) doesn't exist.
67 # A simple variant is to prefix commands with $(Q) - that's useful
68 # for commands that shall be hidden in non-verbose mode.
72 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
74 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
76 # To put more focus on warnings, be less verbose as default
77 # Use 'make V=1' to see the full commands
79 ifeq ("$(origin V)", "command line")
86 ifeq ($(KBUILD_VERBOSE),1)
94 # If the user is running make -s (silent mode), suppress echoing of
97 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
102 export quiet Q KBUILD_VERBOSE
104 # Call a source code checker (by default, "sparse") as part of the
107 # Use 'make C=1' to enable checking of only re-compiled files.
108 # Use 'make C=2' to enable checking of *all* source files, regardless
109 # of whether they are re-compiled or not.
111 # See the file "Documentation/dev-tools/sparse.rst" for more details,
112 # including where to get the "sparse" utility.
114 ifeq ("$(origin C)", "command line")
115 KBUILD_CHECKSRC = $(C)
117 ifndef KBUILD_CHECKSRC
121 export KBUILD_CHECKSRC
123 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
124 # directory of external module to build. Setting M= takes precedence.
125 ifeq ("$(origin M)", "command line")
126 KBUILD_EXTMOD := $(M)
129 $(if $(word 2, $(KBUILD_EXTMOD)), \
130 $(error building multiple external modules is not supported))
132 # Remove trailing slashes
133 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
134 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
139 # Kbuild will save output files in the current working directory.
140 # This does not need to match to the root of the kernel source tree.
142 # For example, you can do this:
144 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
146 # If you want to save output files in a different location, there are
147 # two syntaxes to specify it.
150 # Use "make O=dir/to/store/output/files/"
152 # 2) Set KBUILD_OUTPUT
153 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
154 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
156 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
159 # Do we want to change the working directory?
160 ifeq ("$(origin O)", "command line")
161 KBUILD_OUTPUT := $(O)
164 ifneq ($(KBUILD_OUTPUT),)
165 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
166 # expand a shell special character '~'. We use a somewhat tedious way here.
167 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
168 $(if $(abs_objtree),, \
169 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
171 # $(realpath ...) resolves symlinks
172 abs_objtree := $(realpath $(abs_objtree))
174 abs_objtree := $(CURDIR)
175 endif # ifneq ($(KBUILD_OUTPUT),)
177 ifeq ($(abs_objtree),$(CURDIR))
178 # Suppress "Entering directory ..." unless we are changing the work directory.
179 MAKEFLAGS += --no-print-directory
184 this-makefile := $(lastword $(MAKEFILE_LIST))
185 abs_srctree := $(realpath $(dir $(this-makefile)))
187 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
188 $(error source directory cannot contain spaces or colons)
191 ifneq ($(abs_srctree),$(abs_objtree))
192 # Look for make include files relative to root of kernel src
194 # This does not become effective immediately because MAKEFLAGS is re-parsed
195 # once after the Makefile is read. We need to invoke sub-make.
196 MAKEFLAGS += --include-dir=$(abs_srctree)
200 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
201 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
202 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
204 # Cancel implicit rules for this Makefile.
208 export abs_srctree abs_objtree
209 export sub_make_done := 1
211 ifeq ($(need-sub-make),1)
213 PHONY += $(MAKECMDGOALS) __sub-make
215 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
218 # Invoke a second make in the output directory, passing relevant variables
220 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
222 endif # need-sub-make
223 endif # sub_make_done
225 # We process the rest of the Makefile if this is the final invocation of make
226 ifeq ($(need-sub-make),)
228 # Do not print "Entering directory ...",
229 # but we want to display it when entering to the output directory
230 # so that IDEs/editors are able to understand relative filenames.
231 MAKEFLAGS += --no-print-directory
233 ifeq ($(abs_srctree),$(abs_objtree))
234 # building in the source tree
236 building_out_of_srctree :=
238 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
239 # building in a subdirectory of the source tree
242 srctree := $(abs_srctree)
244 building_out_of_srctree := 1
247 ifneq ($(KBUILD_ABS_SRCTREE),)
248 srctree := $(abs_srctree)
254 export building_out_of_srctree srctree objtree VPATH
256 # To make sure we do not include .config for any of the *config targets
257 # catch them early, and hand them over to scripts/kconfig/Makefile
258 # It is allowed to specify more targets when calling make, including
259 # mixing *config targets and build targets.
260 # For example 'make oldconfig all'.
261 # Detect when mixed targets is specified, and make a second invocation
262 # of make so .config is not included in this case either (for *config).
264 version_h := include/generated/uapi/linux/version.h
266 clean-targets := %clean mrproper cleandocs
267 no-dot-config-targets := $(clean-targets) \
268 cscope gtags TAGS tags help% %docs check% coccicheck \
269 $(version_h) headers headers_% archheaders archscripts \
270 %asm-generic kernelversion %src-pkg dt_binding_check \
272 # Installation targets should not require compiler. Unfortunately, vdso_install
273 # is an exception where build artifacts may be updated. This must be fixed.
274 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
275 headers_install modules_install kernelrelease image_name
276 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
278 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
287 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
293 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
294 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
299 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
300 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
305 ifneq ($(KBUILD_EXTMOD),)
309 ifeq ($(KBUILD_EXTMOD),)
310 ifneq ($(filter %config,$(MAKECMDGOALS)),)
312 ifneq ($(words $(MAKECMDGOALS)),1)
318 # We cannot build single targets and the others at the same time
319 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
321 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
326 # For "make -j clean all", "make -j mrproper defconfig all", etc.
327 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
328 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
333 # install and modules_install need also be processed one by one
334 ifneq ($(filter install,$(MAKECMDGOALS)),)
335 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
341 # ===========================================================================
342 # We're called with mixed targets (*config and build targets).
343 # Handle them one by one.
345 PHONY += $(MAKECMDGOALS) __build_one_by_one
347 $(MAKECMDGOALS): __build_one_by_one
352 for i in $(MAKECMDGOALS); do \
353 $(MAKE) -f $(srctree)/Makefile $$i; \
358 include $(srctree)/scripts/Kbuild.include
360 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
361 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
362 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
363 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
365 include $(srctree)/scripts/subarch.include
367 # Cross compiling and selecting different set of gcc/bin-utils
368 # ---------------------------------------------------------------------------
370 # When performing cross compilation for other architectures ARCH shall be set
371 # to the target architecture. (See arch/* for the possibilities).
372 # ARCH can be set during invocation of make:
374 # Another way is to have ARCH set in the environment.
375 # The default ARCH is the host where make is executed.
377 # CROSS_COMPILE specify the prefix used for all executables used
378 # during compilation. Only gcc and related bin-utils executables
379 # are prefixed with $(CROSS_COMPILE).
380 # CROSS_COMPILE can be set on the command line
381 # make CROSS_COMPILE=ia64-linux-
382 # Alternatively CROSS_COMPILE can be set in the environment.
383 # Default value for CROSS_COMPILE is not to prefix executables
384 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
387 # Architecture as present in compile.h
388 UTS_MACHINE := $(ARCH)
391 # Additional ARCH settings for x86
395 ifeq ($(ARCH),x86_64)
399 # Additional ARCH settings for sparc
400 ifeq ($(ARCH),sparc32)
403 ifeq ($(ARCH),sparc64)
407 export cross_compiling :=
408 ifneq ($(SRCARCH),$(SUBARCH))
412 KCONFIG_CONFIG ?= .config
413 export KCONFIG_CONFIG
415 # SHELL used by kbuild
418 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
419 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
420 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
430 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
431 -O2 -fomit-frame-pointer -std=gnu89
432 export KBUILD_USERLDFLAGS :=
434 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
435 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
436 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
437 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
439 # Make variables (CC, etc...)
446 OBJCOPY = llvm-objcopy
447 OBJDUMP = llvm-objdump
448 READELF = llvm-readelf
451 CC = $(CROSS_COMPILE)gcc
452 LD = $(CROSS_COMPILE)ld
453 AR = $(CROSS_COMPILE)ar
454 NM = $(CROSS_COMPILE)nm
455 OBJCOPY = $(CROSS_COMPILE)objcopy
456 OBJDUMP = $(CROSS_COMPILE)objdump
457 READELF = $(CROSS_COMPILE)readelf
458 STRIP = $(CROSS_COMPILE)strip
461 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
465 INSTALLKERNEL := installkernel
479 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
480 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
489 # Use USERINCLUDE when you must reference the UAPI directories only.
491 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
492 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
493 -I$(srctree)/include/uapi \
494 -I$(objtree)/include/generated/uapi \
495 -include $(srctree)/include/linux/compiler-version.h \
496 -include $(srctree)/include/linux/kconfig.h
498 # Use LINUXINCLUDE when you must reference the include/ directory.
499 # Needed to be compatible with the O= option
501 -I$(srctree)/arch/$(SRCARCH)/include \
502 -I$(objtree)/arch/$(SRCARCH)/include/generated \
503 $(if $(building_out_of_srctree),-I$(srctree)/include) \
504 -I$(objtree)/include \
507 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
508 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
509 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
510 -Werror=implicit-function-declaration -Werror=implicit-int \
511 -Werror=return-type -Wno-format-security \
513 KBUILD_CPPFLAGS := -D__KERNEL__
514 KBUILD_AFLAGS_KERNEL :=
515 KBUILD_CFLAGS_KERNEL :=
516 KBUILD_AFLAGS_MODULE := -DMODULE
517 KBUILD_CFLAGS_MODULE := -DMODULE
518 KBUILD_LDFLAGS_MODULE :=
522 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
523 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
524 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
525 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
526 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
528 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
529 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
530 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
531 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
532 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
534 # Files to ignore in find ... statements
536 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
537 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
539 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
540 --exclude CVS --exclude .pc --exclude .hg --exclude .git
542 # ===========================================================================
543 # Rules shared between *config targets and build targets
545 # Basic helpers built in scripts/basic/
546 PHONY += scripts_basic
548 $(Q)$(MAKE) $(build)=scripts/basic
549 $(Q)rm -f .tmp_quiet_recordmcount
551 PHONY += outputmakefile
552 # Before starting out-of-tree build, make sure the source tree is clean.
553 # outputmakefile generates a Makefile in the output directory, if using a
554 # separate output directory. This allows convenient use of make in the
556 # At the same time when output Makefile generated, generate .gitignore to
557 # ignore whole output directory
559 ifdef building_out_of_srctree
560 $(Q)if [ -f $(srctree)/.config -o \
561 -d $(srctree)/include/config -o \
562 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
564 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
565 echo >&2 "*** in $(abs_srctree)";\
569 $(Q)ln -fsn $(srctree) source
570 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
571 $(Q)test -e .gitignore || \
572 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
575 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
576 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
577 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
578 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
579 CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1))
581 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
582 ifneq ($(CROSS_COMPILE),)
583 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
586 CLANG_FLAGS += -integrated-as
588 CLANG_FLAGS += -no-integrated-as
589 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
590 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
592 CLANG_FLAGS += -Werror=unknown-warning-option
593 KBUILD_CFLAGS += $(CLANG_FLAGS)
594 KBUILD_AFLAGS += $(CLANG_FLAGS)
598 # Include this also for config targets because some architectures need
599 # cc-cross-prefix to determine CROSS_COMPILE.
601 include $(srctree)/scripts/Makefile.compiler
605 # ===========================================================================
606 # *config targets only - make sure prerequisites are updated, and descend
607 # in scripts/kconfig to make the *config target
609 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
610 # KBUILD_DEFCONFIG may point out an alternative default configuration
611 # used for 'make defconfig'
612 include $(srctree)/arch/$(SRCARCH)/Makefile
613 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
615 config: outputmakefile scripts_basic FORCE
616 $(Q)$(MAKE) $(build)=scripts/kconfig $@
618 %config: outputmakefile scripts_basic FORCE
619 $(Q)$(MAKE) $(build)=scripts/kconfig $@
622 # ===========================================================================
623 # Build targets only - this includes vmlinux, arch specific targets, clean
624 # targets and others. In general all targets except *config targets.
626 # If building an external module we do not care about the all: rule
627 # but instead __all depend on modules
629 ifeq ($(KBUILD_EXTMOD),)
635 # Decide whether to build built-in, modular, or both.
636 # Normally, just do built-in.
641 # If we have only "make modules", don't compile built-in objects.
642 ifeq ($(MAKECMDGOALS),modules)
646 # If we have "make <whatever> modules", compile modules
647 # in addition to whatever we do anyway.
648 # Just "make" or "make all" shall build modules as well
650 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
654 ifeq ($(MAKECMDGOALS),)
658 export KBUILD_MODULES KBUILD_BUILTIN
661 include include/config/auto.conf
664 ifeq ($(KBUILD_EXTMOD),)
665 # Objects we will link into vmlinux / subdirs we need to visit
667 drivers-y := drivers/ sound/
668 drivers-$(CONFIG_SAMPLES) += samples/
669 drivers-$(CONFIG_NET) += net/
672 endif # KBUILD_EXTMOD
674 # The all: target is the default when no target is given on the
676 # This allow a user to issue only 'make' to build a kernel including modules
677 # Defaults to vmlinux, but the arch makefile usually adds further targets
680 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
681 $(call cc-option,-fno-tree-loop-im) \
682 $(call cc-disable-warning,maybe-uninitialized,)
685 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
686 ifdef CONFIG_FUNCTION_TRACER
687 CC_FLAGS_FTRACE := -pg
690 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
691 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
692 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
693 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
694 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
695 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
696 export RETPOLINE_CFLAGS
697 export RETPOLINE_VDSO_CFLAGS
699 include $(srctree)/arch/$(SRCARCH)/Makefile
702 ifdef may-sync-config
703 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
704 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
705 # because some architectures define CROSS_COMPILE there.
706 include include/config/auto.conf.cmd
710 @echo >&2 '*** Configuration file "$@" not found!'
712 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
713 @echo >&2 '*** "make menuconfig" or "make xconfig").'
717 # The actual configuration files used during the build are stored in
718 # include/generated/ and include/config/. Update them if .config is newer than
719 # include/config/auto.conf (which mirrors .config).
721 # This exploits the 'multi-target pattern rule' trick.
722 # The syncconfig should be executed only once to make all the targets.
723 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
725 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
726 # so you cannot notice that Kconfig is waiting for the user input.
727 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
728 $(Q)$(kecho) " SYNC $@"
729 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
730 else # !may-sync-config
731 # External modules and some install targets need include/generated/autoconf.h
732 # and include/config/auto.conf but do not care if they are up-to-date.
733 # Use auto.conf to trigger the test
734 PHONY += include/config/auto.conf
736 include/config/auto.conf:
737 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
739 echo >&2 " ERROR: Kernel configuration is invalid."; \
740 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
741 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
745 endif # may-sync-config
748 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
749 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
750 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
751 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
752 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
754 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
756 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
758 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
762 # Tell gcc to never replace conditional load with a non-conditional one
763 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
764 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
766 ifdef CONFIG_READABLE_ASM
767 # Disable optimizations that make assembler listings hard to read.
768 # reorder blocks reorders the control in the function
769 # ipa clone creates specialized cloned functions
770 # partial inlining inlines only parts of functions
771 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
772 $(call cc-option,-fno-ipa-cp-clone,) \
773 $(call cc-option,-fno-partial-inlining)
776 ifneq ($(CONFIG_FRAME_WARN),0)
777 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
780 stackp-flags-y := -fno-stack-protector
781 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
782 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
784 KBUILD_CFLAGS += $(stackp-flags-y)
786 ifdef CONFIG_CC_IS_CLANG
787 KBUILD_CPPFLAGS += -Qunused-arguments
788 KBUILD_CFLAGS += -Wno-format-invalid-specifier
789 KBUILD_CFLAGS += -Wno-gnu
790 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
791 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
792 # See modpost pattern 2
793 KBUILD_CFLAGS += -mno-global-merge
796 # Warn about unmarked fall-throughs in switch statement.
797 # Disabled for clang while comment to attribute conversion happens and
798 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
799 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
802 # These warnings generated too much noise in a regular build.
803 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
804 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
806 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
807 ifdef CONFIG_FRAME_POINTER
808 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
810 # Some targets (ARM with Thumb2, for example), can't be built with frame
811 # pointers. For those, we don't have FUNCTION_TRACER automatically
812 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
813 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
814 # -fomit-frame-pointer with FUNCTION_TRACER.
815 ifndef CONFIG_FUNCTION_TRACER
816 KBUILD_CFLAGS += -fomit-frame-pointer
820 # Initialize all stack variables with a 0xAA pattern.
821 ifdef CONFIG_INIT_STACK_ALL_PATTERN
822 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
825 # Initialize all stack variables with a zero value.
826 ifdef CONFIG_INIT_STACK_ALL_ZERO
827 # Future support for zero initialization is still being debated, see
828 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
829 # renamed or dropped.
830 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
831 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
834 # While VLAs have been removed, GCC produces unreachable stack probes
835 # for the randomize_kstack_offset feature. Disable it for all compilers.
836 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
840 # Workaround for GCC versions < 5.0
841 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
842 ifdef CONFIG_CC_IS_GCC
843 DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
846 ifdef CONFIG_DEBUG_INFO
848 ifdef CONFIG_DEBUG_INFO_SPLIT
849 DEBUG_CFLAGS += -gsplit-dwarf
854 ifneq ($(LLVM_IAS),1)
855 KBUILD_AFLAGS += -Wa,-gdwarf-2
858 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
859 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
860 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
861 DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
864 ifdef CONFIG_DEBUG_INFO_REDUCED
865 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
866 $(call cc-option,-fno-var-tracking)
869 ifdef CONFIG_DEBUG_INFO_COMPRESSED
870 DEBUG_CFLAGS += -gz=zlib
871 KBUILD_AFLAGS += -gz=zlib
872 KBUILD_LDFLAGS += --compress-debug-sections=zlib
875 endif # CONFIG_DEBUG_INFO
877 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
880 ifdef CONFIG_FUNCTION_TRACER
881 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
882 CC_FLAGS_FTRACE += -mrecord-mcount
883 ifdef CONFIG_HAVE_NOP_MCOUNT
884 ifeq ($(call cc-option-yn, -mnop-mcount),y)
885 CC_FLAGS_FTRACE += -mnop-mcount
886 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
890 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
891 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
893 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
894 ifdef CONFIG_HAVE_C_RECORDMCOUNT
895 BUILD_C_RECORDMCOUNT := y
896 export BUILD_C_RECORDMCOUNT
899 ifdef CONFIG_HAVE_FENTRY
900 ifeq ($(call cc-option-yn, -mfentry),y)
901 CC_FLAGS_FTRACE += -mfentry
902 CC_FLAGS_USING += -DCC_USING_FENTRY
905 export CC_FLAGS_FTRACE
906 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
907 KBUILD_AFLAGS += $(CC_FLAGS_USING)
910 # We trigger additional mismatches with less inlining
911 ifdef CONFIG_DEBUG_SECTION_MISMATCH
912 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
915 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
916 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
917 LDFLAGS_vmlinux += --gc-sections
920 ifdef CONFIG_SHADOW_CALL_STACK
921 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
922 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
926 ifdef CONFIG_LTO_CLANG
927 ifdef CONFIG_LTO_CLANG_THIN
928 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
929 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
931 CC_FLAGS_LTO := -flto
933 CC_FLAGS_LTO += -fvisibility=hidden
935 # Limit inlining across translation units to reduce binary size
936 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
938 # Check for frame size exceeding threshold during prolog/epilog insertion
939 # when using lld < 13.0.0.
940 ifneq ($(CONFIG_FRAME_WARN),0)
941 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
942 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
948 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
949 KBUILD_AFLAGS += -fno-lto
953 ifdef CONFIG_CFI_CLANG
954 CC_FLAGS_CFI := -fsanitize=cfi \
955 -fsanitize-cfi-cross-dso \
956 -fno-sanitize-cfi-canonical-jump-tables \
957 -fno-sanitize-trap=cfi \
958 -fno-sanitize-blacklist
960 ifdef CONFIG_CFI_PERMISSIVE
961 CC_FLAGS_CFI += -fsanitize-recover=cfi
964 # If LTO flags are filtered out, we must also filter out CFI.
965 CC_FLAGS_LTO += $(CC_FLAGS_CFI)
966 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
970 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
971 KBUILD_CFLAGS += -falign-functions=32
974 # arch Makefile may override CC so keep this after arch Makefile is included
975 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
977 # warn about C99 declaration after statement
978 KBUILD_CFLAGS += -Wdeclaration-after-statement
980 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
981 KBUILD_CFLAGS += -Wvla
983 # disable pointer signed / unsigned warnings in gcc 4.0
984 KBUILD_CFLAGS += -Wno-pointer-sign
986 # disable stringop warnings in gcc 8+
987 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
989 # We'll want to enable this eventually, but it's not going away for 5.7 at least
990 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
991 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
992 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
994 # Another good warning that we'll want to enable eventually
995 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
997 # Enabled with W=2, disabled by default as noisy
998 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
1000 # disable invalid "can't wrap" optimizations for signed / pointers
1001 KBUILD_CFLAGS += -fno-strict-overflow
1003 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1004 KBUILD_CFLAGS += -fno-stack-check
1006 # conserve stack if available
1007 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
1009 # Prohibit date/time macros, which would make the build non-deterministic
1010 KBUILD_CFLAGS += -Werror=date-time
1012 # enforce correct pointer usage
1013 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
1015 # Require designated initializers for all marked structures
1016 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1018 # change __FILE__ to the relative path from the srctree
1019 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1021 # include additional Makefiles when needed
1022 include-y := scripts/Makefile.extrawarn
1023 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1024 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1025 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1026 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1027 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1029 include $(addprefix $(srctree)/, $(include-y))
1031 # scripts/Makefile.gcc-plugins is intentionally included last.
1032 # Do not add $(call cc-option,...) below this line. When you build the kernel
1033 # from the clean source tree, the GCC plugins do not exist at this point.
1035 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1036 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1037 KBUILD_AFLAGS += $(KAFLAGS)
1038 KBUILD_CFLAGS += $(KCFLAGS)
1040 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1041 LDFLAGS_vmlinux += --build-id=sha1
1043 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1044 LDFLAGS_vmlinux += $(call ld-option, -X,)
1047 ifeq ($(CONFIG_RELR),y)
1048 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1051 # We never want expected sections to be placed heuristically by the
1052 # linker. All sections should be explicitly named in the linker script.
1053 ifdef CONFIG_LD_ORPHAN_WARN
1054 LDFLAGS_vmlinux += --orphan-handling=warn
1057 # Align the bit size of userspace programs with the kernel
1058 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1059 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1061 # make the checker run with the right architecture
1062 CHECKFLAGS += --arch=$(ARCH)
1064 # insure the checker run with the right endianness
1065 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1067 # the checker needs the correct machine size
1068 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1070 # Default kernel image to build when no specific target is given.
1071 # KBUILD_IMAGE may be overruled on the command line or
1072 # set in the environment
1073 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1074 # this default value
1075 export KBUILD_IMAGE ?= vmlinux
1078 # INSTALL_PATH specifies where to place the updated kernel and system map
1079 # images. Default is /boot, but you can set it to other values
1080 export INSTALL_PATH ?= /boot
1083 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1084 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1085 # an argument if needed. Otherwise it defaults to the kernel install path
1087 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1090 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1091 # relocations required by build roots. This is not defined in the
1092 # makefile but the argument can be passed to make if needed.
1095 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1098 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1100 has_libelf = $(call try-run,\
1101 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1103 ifdef CONFIG_STACK_VALIDATION
1104 ifeq ($(has_libelf),1)
1105 objtool_target := tools/objtool FORCE
1107 SKIP_STACK_VALIDATION := 1
1108 export SKIP_STACK_VALIDATION
1112 PHONY += resolve_btfids_clean
1114 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1116 # tools/bpf/resolve_btfids directory might not exist
1117 # in output directory, skip its clean in that case
1118 resolve_btfids_clean:
1119 ifneq ($(wildcard $(resolve_btfids_O)),)
1120 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1124 ifdef CONFIG_DEBUG_INFO_BTF
1125 ifeq ($(has_libelf),1)
1126 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1128 ERROR_RESOLVE_BTFIDS := 1
1130 endif # CONFIG_DEBUG_INFO_BTF
1135 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1136 export MODORDER := $(extmod_prefix)modules.order
1137 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1139 ifeq ($(KBUILD_EXTMOD),)
1140 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1142 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1143 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1144 $(libs-y) $(libs-m)))
1146 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1147 $(patsubst %/,%,$(filter %/, $(core-) \
1148 $(drivers-) $(libs-))))
1150 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1151 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1152 $(drivers-y) $(drivers-m)))
1154 build-dirs := $(vmlinux-dirs)
1155 clean-dirs := $(vmlinux-alldirs)
1157 # Externally visible symbols (used by link-vmlinux.sh)
1158 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1159 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1160 ifdef CONFIG_MODULES
1161 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1162 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1164 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1166 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1168 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1169 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1170 # used by scripts/Makefile.package
1171 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1173 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1175 # Recurse until adjust_autoksyms.sh is satisfied
1176 PHONY += autoksyms_recursive
1177 ifdef CONFIG_TRIM_UNUSED_KSYMS
1178 # For the kernel to actually contain only the needed exported symbols,
1179 # we have to build modules as well to determine what those symbols are.
1180 # (this can be evaluated only once include/config/auto.conf has been included)
1183 autoksyms_recursive: descend modules.order
1184 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1185 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1188 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1190 quiet_cmd_autoksyms_h = GEN $@
1191 cmd_autoksyms_h = mkdir -p $(dir $@); \
1192 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1195 $(call cmd,autoksyms_h)
1197 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1199 # Final link of vmlinux with optional arch pass after final link
1200 cmd_link-vmlinux = \
1201 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1202 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1204 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1205 +$(call if_changed_dep,link-vmlinux)
1209 # The actual objects are generated when descending,
1210 # make sure no implicit rule kicks in
1211 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1213 filechk_kernel.release = \
1214 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1216 # Store (new) KERNELRELEASE string in include/config/kernel.release
1217 include/config/kernel.release: FORCE
1218 $(call filechk,kernel.release)
1220 # Additional helpers built in scripts/
1221 # Carefully list dependencies so we do not try to build scripts twice
1224 scripts: scripts_basic scripts_dtc
1225 $(Q)$(MAKE) $(build)=$(@)
1227 # Things we need to do before we recursively start building the kernel
1228 # or the modules are listed in "prepare".
1229 # A multi level approach is used. prepareN is processed before prepareN-1.
1230 # archprepare is used in arch Makefiles and when processed asm symlink,
1231 # version.h and scripts_basic is processed / created.
1233 PHONY += prepare archprepare
1235 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1236 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1237 include/generated/autoconf.h remove-stale-files
1239 prepare0: archprepare
1240 $(Q)$(MAKE) $(build)=scripts/mod
1241 $(Q)$(MAKE) $(build)=.
1243 # All the preparing..
1244 prepare: prepare0 prepare-objtool prepare-resolve_btfids
1246 PHONY += remove-stale-files
1248 $(Q)$(srctree)/scripts/remove-stale-files
1250 # Support for using generic headers in asm-generic
1251 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1253 PHONY += asm-generic uapi-asm-generic
1254 asm-generic: uapi-asm-generic
1255 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1256 generic=include/asm-generic
1258 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1259 generic=include/uapi/asm-generic
1261 PHONY += prepare-objtool prepare-resolve_btfids
1262 prepare-objtool: $(objtool_target)
1263 ifeq ($(SKIP_STACK_VALIDATION),1)
1264 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
1265 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1268 ifdef CONFIG_UNWINDER_ORC
1269 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1272 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1276 prepare-resolve_btfids: $(resolve_btfids_target)
1277 ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1278 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1281 # Generate some files
1282 # ---------------------------------------------------------------------------
1284 # KERNELRELEASE can change from a few different places, meaning version.h
1285 # needs to be updated, so this check is forced on all builds
1288 define filechk_utsrelease.h
1289 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1290 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1293 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1296 define filechk_version.h
1297 if [ $(SUBLEVEL) -gt 255 ]; then \
1298 echo \#define LINUX_VERSION_CODE $(shell \
1299 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1301 echo \#define LINUX_VERSION_CODE $(shell \
1302 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1304 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1305 ((c) > 255 ? 255 : (c)))'; \
1306 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1307 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1308 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1311 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1312 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1314 $(call filechk,version.h)
1316 include/generated/utsrelease.h: include/config/kernel.release FORCE
1317 $(call filechk,utsrelease.h)
1321 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1322 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1324 # ---------------------------------------------------------------------------
1327 #Default location for installed headers
1328 export INSTALL_HDR_PATH = $(objtree)/usr
1330 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1331 cmd_headers_install = \
1332 mkdir -p $(INSTALL_HDR_PATH); \
1333 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1334 usr/include $(INSTALL_HDR_PATH)
1336 PHONY += headers_install
1337 headers_install: headers
1338 $(call cmd,headers_install)
1340 PHONY += archheaders archscripts
1342 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1345 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1346 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1347 $(error Headers not exportable for the $(SRCARCH) architecture))
1348 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1349 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1351 # Deprecated. It is no-op now.
1352 PHONY += headers_check
1354 @echo >&2 "=================== WARNING ==================="
1355 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op,"
1356 @echo >&2 "and will be removed after Linux 5.15 release."
1357 @echo >&2 "Please remove headers_check from your scripts."
1358 @echo >&2 "==============================================="
1360 ifdef CONFIG_HEADERS_INSTALL
1364 PHONY += scripts_unifdef
1365 scripts_unifdef: scripts_basic
1366 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1368 # ---------------------------------------------------------------------------
1371 # Many distributions have the custom install script, /sbin/installkernel.
1372 # If DKMS is installed, 'make install' will eventually recuses back
1373 # to the this Makefile to build and install external modules.
1374 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1376 install: sub_make_done :=
1382 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1385 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1387 PHONY += kselftest-merge
1389 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1390 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1391 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1392 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1394 # ---------------------------------------------------------------------------
1397 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1398 dtstree := arch/$(SRCARCH)/boot/dts
1403 %.dtb: include/config/kernel.release scripts_dtc
1404 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1406 %.dtbo: include/config/kernel.release scripts_dtc
1407 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1409 PHONY += dtbs dtbs_install dtbs_check
1410 dtbs: include/config/kernel.release scripts_dtc
1411 $(Q)$(MAKE) $(build)=$(dtstree)
1413 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1415 dtbs: dt_binding_check
1421 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1423 ifdef CONFIG_OF_EARLY_FLATTREE
1429 PHONY += scripts_dtc
1430 scripts_dtc: scripts_basic
1431 $(Q)$(MAKE) $(build)=scripts/dtc
1433 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1434 export CHECK_DT_BINDING=y
1437 PHONY += dt_binding_check
1438 dt_binding_check: scripts_dtc
1439 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1441 # ---------------------------------------------------------------------------
1444 ifdef CONFIG_MODULES
1446 # By default, build modules as well
1450 # When we're building modules with modversions, we need to consider
1451 # the built-in objects during the descend as well, in order to
1452 # make sure the checksums are up to date before we record them.
1453 ifdef CONFIG_MODVERSIONS
1459 # A module can be listed more than once in obj-m resulting in
1460 # duplicate lines in modules.order files. Those are removed
1461 # using awk while concatenating to the final file.
1464 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1466 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1468 modules.order: $(subdir-modorder) FORCE
1469 $(call if_changed,modules_order)
1471 targets += modules.order
1473 # Target to prepare building external modules
1474 PHONY += modules_prepare
1475 modules_prepare: prepare
1476 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1478 export modules_sign_only :=
1480 ifeq ($(CONFIG_MODULE_SIG),y)
1481 PHONY += modules_sign
1482 modules_sign: modules_install
1485 # modules_sign is a subset of modules_install.
1486 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1487 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1488 modules_sign_only := y
1493 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1494 modinst_pre := __modinst_pre
1497 modules_install: $(modinst_pre)
1498 PHONY += __modinst_pre
1500 @rm -rf $(MODLIB)/kernel
1501 @rm -f $(MODLIB)/source
1502 @mkdir -p $(MODLIB)/kernel
1503 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1504 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1505 rm -f $(MODLIB)/build ; \
1506 ln -s $(CURDIR) $(MODLIB)/build ; \
1508 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1509 @cp -f modules.builtin $(MODLIB)/
1510 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1512 endif # CONFIG_MODULES
1515 # Cleaning is done on three levels.
1516 # make clean Delete most generated files
1517 # Leave enough to build external modules
1518 # make mrproper Delete the current configuration, and all generated files
1519 # make distclean Remove editor backup files, patch leftover files and the like
1521 # Directories & files removed with 'make clean'
1522 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1523 modules.builtin modules.builtin.modinfo modules.nsdeps \
1524 compile_commands.json .thinlto-cache
1526 # Directories & files removed with 'make mrproper'
1527 MRPROPER_FILES += include/config include/generated \
1528 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1529 debian snap tar-install \
1530 .config .config.old .version \
1532 certs/signing_key.pem certs/signing_key.x509 \
1537 # clean - Delete most, but leave enough to build external modules
1539 clean: rm-files := $(CLEAN_FILES)
1541 PHONY += archclean vmlinuxclean
1544 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1545 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1547 clean: archclean vmlinuxclean resolve_btfids_clean
1549 # mrproper - Delete all generated files, including .config
1551 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1552 mrproper-dirs := $(addprefix _mrproper_,scripts)
1554 PHONY += $(mrproper-dirs) mrproper
1556 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1558 mrproper: clean $(mrproper-dirs)
1566 @find . $(RCS_FIND_IGNORE) \
1567 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1568 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1569 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1570 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1571 -type f -print | xargs rm -f
1574 # Packaging of the kernel to various formats
1575 # ---------------------------------------------------------------------------
1578 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1579 %pkg: include/config/kernel.release FORCE
1580 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1582 # Brief documentation of the typical targets used
1583 # ---------------------------------------------------------------------------
1585 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1586 boards := $(sort $(notdir $(boards)))
1587 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1588 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1592 @echo 'Cleaning targets:'
1593 @echo ' clean - Remove most generated files but keep the config and'
1594 @echo ' enough build support to build external modules'
1595 @echo ' mrproper - Remove all generated files + config + various backup files'
1596 @echo ' distclean - mrproper + remove editor backup and patch files'
1598 @echo 'Configuration targets:'
1599 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1601 @echo 'Other generic targets:'
1602 @echo ' all - Build all targets marked with [*]'
1603 @echo '* vmlinux - Build the bare kernel'
1604 @echo '* modules - Build all modules'
1605 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1606 @echo ' dir/ - Build all files in dir and below'
1607 @echo ' dir/file.[ois] - Build specified target only'
1608 @echo ' dir/file.ll - Build the LLVM assembly file'
1609 @echo ' (requires compiler support for LLVM assembly generation)'
1610 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1611 @echo ' (requires a recent binutils and recent build (System.map))'
1612 @echo ' dir/file.ko - Build module including final link'
1613 @echo ' modules_prepare - Set up for building external modules'
1614 @echo ' tags/TAGS - Generate tags file for editors'
1615 @echo ' cscope - Generate cscope index'
1616 @echo ' gtags - Generate GNU GLOBAL index'
1617 @echo ' kernelrelease - Output the release version string (use with make -s)'
1618 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1619 @echo ' image_name - Output the image name (use with make -s)'
1620 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1621 echo ' (default: $(INSTALL_HDR_PATH))'; \
1623 @echo 'Static analysers:'
1624 @echo ' checkstack - Generate a list of stack hogs'
1625 @echo ' versioncheck - Sanity check on version.h usage'
1626 @echo ' includecheck - Check for duplicate included header files'
1627 @echo ' export_report - List the usages of all exported symbols'
1628 @echo ' headerdep - Detect inclusion cycles in headers'
1629 @echo ' coccicheck - Check with Coccinelle'
1630 @echo ' clang-analyzer - Check with clang static analyzer'
1631 @echo ' clang-tidy - Check with clang-tidy'
1634 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1636 @echo 'Kernel selftest:'
1637 @echo ' kselftest - Build and run kernel selftest'
1638 @echo ' Build, install, and boot kernel before'
1639 @echo ' running kselftest on it'
1640 @echo ' Run as root for full coverage'
1641 @echo ' kselftest-all - Build kernel selftest'
1642 @echo ' kselftest-install - Build and install kernel selftest'
1643 @echo ' kselftest-clean - Remove all generated kselftest files'
1644 @echo ' kselftest-merge - Merge all the config dependencies of'
1645 @echo ' kselftest to existing .config.'
1648 echo 'Devicetree:'; \
1649 echo '* dtbs - Build device tree blobs for enabled boards'; \
1650 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1651 echo ' dt_binding_check - Validate device tree binding documents'; \
1652 echo ' dtbs_check - Validate device tree source files';\
1655 @echo 'Userspace tools targets:'
1656 @echo ' use "make tools/help"'
1657 @echo ' or "cd tools; make help"'
1659 @echo 'Kernel packaging:'
1660 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1662 @echo 'Documentation targets:'
1663 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1665 @echo 'Architecture specific targets ($(SRCARCH)):'
1666 @$(if $(archhelp),$(archhelp),\
1667 echo ' No architecture specific help defined for $(SRCARCH)')
1670 $(foreach b, $(boards), \
1671 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1673 @$(if $(board-dirs), \
1674 $(foreach b, $(board-dirs), \
1675 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1676 printf " %-16s - Show all of the above\\n" help-boards; \
1679 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1680 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1681 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1682 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1683 @echo ' (sparse by default)'
1684 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1685 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1686 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1687 @echo ' 1: warnings which may be relevant and do not occur too often'
1688 @echo ' 2: warnings which occur quite often but may still be relevant'
1689 @echo ' 3: more obscure warnings, can most likely be ignored'
1690 @echo ' Multiple levels can be combined with W=12 or W=123'
1692 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1693 @echo 'For further info see the ./README file'
1696 help-board-dirs := $(addprefix help-,$(board-dirs))
1698 help-boards: $(help-board-dirs)
1700 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1702 $(help-board-dirs): help-%:
1703 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1704 @$(if $(boards-per-dir), \
1705 $(foreach b, $(boards-per-dir), \
1706 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1710 # Documentation targets
1711 # ---------------------------------------------------------------------------
1712 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1713 linkcheckdocs dochelp refcheckdocs
1714 PHONY += $(DOC_TARGETS)
1716 $(Q)$(MAKE) $(build)=Documentation $@
1719 # ---------------------------------------------------------------------------
1721 PHONY += scripts_gdb
1722 scripts_gdb: prepare0
1723 $(Q)$(MAKE) $(build)=scripts/gdb
1724 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1726 ifdef CONFIG_GDB_SCRIPTS
1730 else # KBUILD_EXTMOD
1733 # External module support.
1734 # When building external modules the kernel used as basis is considered
1735 # read-only, and no consistency checks are made and the make
1736 # system is not used on the basis kernel. If updates are required
1737 # in the basis kernel ordinary make commands (without M=...) must be used.
1739 # We are always building only modules.
1743 build-dirs := $(KBUILD_EXTMOD)
1744 $(MODORDER): descend
1747 compile_commands.json: $(extmod_prefix)compile_commands.json
1748 PHONY += compile_commands.json
1750 clean-dirs := $(KBUILD_EXTMOD)
1751 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1752 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1756 @echo ' Building external modules.'
1757 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1759 @echo ' modules - default target, build the module(s)'
1760 @echo ' modules_install - install the module'
1761 @echo ' clean - remove generated files in module directory only'
1764 # no-op for external module builds
1765 PHONY += prepare modules_prepare
1767 endif # KBUILD_EXTMOD
1769 # ---------------------------------------------------------------------------
1772 PHONY += modules modules_install
1774 ifdef CONFIG_MODULES
1776 modules: modules_check
1777 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1779 PHONY += modules_check
1780 modules_check: $(MODORDER)
1781 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1783 quiet_cmd_depmod = DEPMOD $(MODLIB)
1784 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1788 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1791 else # CONFIG_MODULES
1793 # Modules not configured
1794 # ---------------------------------------------------------------------------
1796 modules modules_install:
1798 @echo >&2 '*** The present kernel configuration has modules disabled.'
1799 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1800 @echo >&2 '*** to enable CONFIG_MODULES.'
1804 endif # CONFIG_MODULES
1807 # ---------------------------------------------------------------------------
1808 # To build individual files in subdirectories, you can do like this:
1810 # make foo/bar/baz.s
1812 # The supported suffixes for single-target are listed in 'single-targets'
1814 # To build only under specific subdirectories, you can do like this:
1820 # .ko is special because modpost is needed
1821 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1822 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1824 $(single-ko): single_modpost
1826 $(single-no-ko): descend
1829 ifeq ($(KBUILD_EXTMOD),)
1830 # For the single build of in-tree modules, use a temporary file to avoid
1831 # the situation of modules_install installing an invalid modules.order.
1832 MODORDER := .modules.tmp
1835 PHONY += single_modpost
1836 single_modpost: $(single-no-ko) modules_prepare
1837 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
1838 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1842 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
1844 # trim unrelated directories
1845 build-dirs := $(foreach d, $(build-dirs), \
1846 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1850 ifndef CONFIG_MODULES
1854 # Handle descending into subdirectories listed in $(build-dirs)
1855 # Preset locale variables to speed up the build process. Limit locale
1856 # tweaks to this spot to avoid wrong language settings when running
1857 # make menuconfig etc.
1858 # Error messages still appears in the original language
1859 PHONY += descend $(build-dirs)
1860 descend: $(build-dirs)
1861 $(build-dirs): prepare
1862 $(Q)$(MAKE) $(build)=$@ \
1863 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1864 need-builtin=1 need-modorder=1
1866 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1867 PHONY += $(clean-dirs) clean
1869 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1871 clean: $(clean-dirs)
1873 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1874 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1876 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1877 -o -name '*.dwo' -o -name '*.lst' \
1878 -o -name '*.su' -o -name '*.mod' \
1879 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1880 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1881 -o -name '*.asn1.[ch]' \
1882 -o -name '*.symtypes' -o -name 'modules.order' \
1883 -o -name '.tmp_*.o.*' \
1884 -o -name '*.c.[012]*.*' \
1887 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1889 # Generate tags for editors
1890 # ---------------------------------------------------------------------------
1891 quiet_cmd_tags = GEN $@
1892 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1894 tags TAGS cscope gtags: FORCE
1897 # Script to generate missing namespace dependencies
1898 # ---------------------------------------------------------------------------
1901 nsdeps: export KBUILD_NSDEPS=1
1903 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1906 # ---------------------------------------------------------------------------
1908 quiet_cmd_gen_compile_commands = GEN $@
1909 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1911 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1912 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1913 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1914 $(call if_changed,gen_compile_commands)
1916 targets += $(extmod_prefix)compile_commands.json
1918 PHONY += clang-tidy clang-analyzer
1920 ifdef CONFIG_CC_IS_CLANG
1921 quiet_cmd_clang_tools = CHECK $<
1922 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1924 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1925 $(call cmd,clang_tools)
1927 clang-tidy clang-analyzer:
1928 @echo "$@ requires CC=clang" >&2
1932 # Scripts to check various things for consistency
1933 # ---------------------------------------------------------------------------
1935 PHONY += includecheck versioncheck coccicheck export_report
1938 find $(srctree)/* $(RCS_FIND_IGNORE) \
1939 -name '*.[hcS]' -type f -print | sort \
1940 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1943 find $(srctree)/* $(RCS_FIND_IGNORE) \
1944 -name '*.[hcS]' -type f -print | sort \
1945 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1948 $(Q)$(BASH) $(srctree)/scripts/$@
1951 $(PERL) $(srctree)/scripts/export_report.pl
1953 PHONY += checkstack kernelrelease kernelversion image_name
1955 # UML needs a little special treatment here. It wants to use the host
1956 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1957 # else wants $(ARCH), including people doing cross-builds, which means
1958 # that $(SUBARCH) doesn't work here.
1960 CHECKSTACK_ARCH := $(SUBARCH)
1962 CHECKSTACK_ARCH := $(ARCH)
1965 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1966 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1969 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1972 @echo $(KERNELVERSION)
1975 @echo $(KBUILD_IMAGE)
1977 # Clear a bunch of variables before executing the submake
1979 ifeq ($(quiet),silent_)
1984 $(Q)mkdir -p $(objtree)/tools
1985 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1988 $(Q)mkdir -p $(objtree)/tools
1989 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1991 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1992 cmd_rmfiles = rm -rf $(rm-files)
1994 # read saved command lines for existing targets
1995 existing-targets := $(wildcard $(sort $(targets)))
1997 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1999 endif # config-build
2001 endif # need-sub-make
2006 # Declare the contents of the PHONY variable as phony. We keep that
2007 # information in a variable so we can use it in if_changed and friends.