1 # SPDX-License-Identifier: GPL-2.0
6 NAME = 💕 Valentine's Day Edition 💕
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))),)
101 export quiet Q KBUILD_VERBOSE
103 # Call a source code checker (by default, "sparse") as part of the
106 # Use 'make C=1' to enable checking of only re-compiled files.
107 # Use 'make C=2' to enable checking of *all* source files, regardless
108 # of whether they are re-compiled or not.
110 # See the file "Documentation/dev-tools/sparse.rst" for more details,
111 # including where to get the "sparse" utility.
113 ifeq ("$(origin C)", "command line")
114 KBUILD_CHECKSRC = $(C)
116 ifndef KBUILD_CHECKSRC
120 export KBUILD_CHECKSRC
122 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
123 # directory of external module to build. Setting M= takes precedence.
124 ifeq ("$(origin M)", "command line")
125 KBUILD_EXTMOD := $(M)
128 $(if $(word 2, $(KBUILD_EXTMOD)), \
129 $(error building multiple external modules is not supported))
133 # Kbuild will save output files in the current working directory.
134 # This does not need to match to the root of the kernel source tree.
136 # For example, you can do this:
138 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
140 # If you want to save output files in a different location, there are
141 # two syntaxes to specify it.
144 # Use "make O=dir/to/store/output/files/"
146 # 2) Set KBUILD_OUTPUT
147 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
148 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
150 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
153 # Do we want to change the working directory?
154 ifeq ("$(origin O)", "command line")
155 KBUILD_OUTPUT := $(O)
158 ifneq ($(KBUILD_OUTPUT),)
159 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
160 # expand a shell special character '~'. We use a somewhat tedious way here.
161 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
162 $(if $(abs_objtree),, \
163 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
165 # $(realpath ...) resolves symlinks
166 abs_objtree := $(realpath $(abs_objtree))
168 abs_objtree := $(CURDIR)
169 endif # ifneq ($(KBUILD_OUTPUT),)
171 ifeq ($(abs_objtree),$(CURDIR))
172 # Suppress "Entering directory ..." unless we are changing the work directory.
173 MAKEFLAGS += --no-print-directory
178 this-makefile := $(lastword $(MAKEFILE_LIST))
179 abs_srctree := $(realpath $(dir $(this-makefile)))
181 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
182 $(error source directory cannot contain spaces or colons)
185 ifneq ($(abs_srctree),$(abs_objtree))
186 # Look for make include files relative to root of kernel src
188 # This does not become effective immediately because MAKEFLAGS is re-parsed
189 # once after the Makefile is read. We need to invoke sub-make.
190 MAKEFLAGS += --include-dir=$(abs_srctree)
194 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
195 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
196 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
198 # Cancel implicit rules for this Makefile.
202 export abs_srctree abs_objtree
203 export sub_make_done := 1
205 ifeq ($(need-sub-make),1)
207 PHONY += $(MAKECMDGOALS) __sub-make
209 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
212 # Invoke a second make in the output directory, passing relevant variables
214 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
216 endif # need-sub-make
217 endif # sub_make_done
219 # We process the rest of the Makefile if this is the final invocation of make
220 ifeq ($(need-sub-make),)
222 # Do not print "Entering directory ...",
223 # but we want to display it when entering to the output directory
224 # so that IDEs/editors are able to understand relative filenames.
225 MAKEFLAGS += --no-print-directory
227 ifeq ($(abs_srctree),$(abs_objtree))
228 # building in the source tree
230 building_out_of_srctree :=
232 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
233 # building in a subdirectory of the source tree
236 srctree := $(abs_srctree)
238 building_out_of_srctree := 1
241 ifneq ($(KBUILD_ABS_SRCTREE),)
242 srctree := $(abs_srctree)
248 export building_out_of_srctree srctree objtree VPATH
250 # To make sure we do not include .config for any of the *config targets
251 # catch them early, and hand them over to scripts/kconfig/Makefile
252 # It is allowed to specify more targets when calling make, including
253 # mixing *config targets and build targets.
254 # For example 'make oldconfig all'.
255 # Detect when mixed targets is specified, and make a second invocation
256 # of make so .config is not included in this case either (for *config).
258 version_h := include/generated/uapi/linux/version.h
260 clean-targets := %clean mrproper cleandocs
261 no-dot-config-targets := $(clean-targets) \
262 cscope gtags TAGS tags help% %docs check% coccicheck \
263 $(version_h) headers headers_% archheaders archscripts \
264 %asm-generic kernelversion %src-pkg dt_binding_check \
266 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease
267 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
275 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
276 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
281 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
282 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
287 ifneq ($(KBUILD_EXTMOD),)
291 ifeq ($(KBUILD_EXTMOD),)
292 ifneq ($(filter %config,$(MAKECMDGOALS)),)
294 ifneq ($(words $(MAKECMDGOALS)),1)
300 # We cannot build single targets and the others at the same time
301 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
303 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
308 # For "make -j clean all", "make -j mrproper defconfig all", etc.
309 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
310 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
315 # install and modules_install need also be processed one by one
316 ifneq ($(filter install,$(MAKECMDGOALS)),)
317 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
323 # ===========================================================================
324 # We're called with mixed targets (*config and build targets).
325 # Handle them one by one.
327 PHONY += $(MAKECMDGOALS) __build_one_by_one
329 $(MAKECMDGOALS): __build_one_by_one
334 for i in $(MAKECMDGOALS); do \
335 $(MAKE) -f $(srctree)/Makefile $$i; \
340 include scripts/Kbuild.include
342 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
343 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
344 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
345 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
347 include scripts/subarch.include
349 # Cross compiling and selecting different set of gcc/bin-utils
350 # ---------------------------------------------------------------------------
352 # When performing cross compilation for other architectures ARCH shall be set
353 # to the target architecture. (See arch/* for the possibilities).
354 # ARCH can be set during invocation of make:
356 # Another way is to have ARCH set in the environment.
357 # The default ARCH is the host where make is executed.
359 # CROSS_COMPILE specify the prefix used for all executables used
360 # during compilation. Only gcc and related bin-utils executables
361 # are prefixed with $(CROSS_COMPILE).
362 # CROSS_COMPILE can be set on the command line
363 # make CROSS_COMPILE=ia64-linux-
364 # Alternatively CROSS_COMPILE can be set in the environment.
365 # Default value for CROSS_COMPILE is not to prefix executables
366 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
369 # Architecture as present in compile.h
370 UTS_MACHINE := $(ARCH)
373 # Additional ARCH settings for x86
377 ifeq ($(ARCH),x86_64)
381 # Additional ARCH settings for sparc
382 ifeq ($(ARCH),sparc32)
385 ifeq ($(ARCH),sparc64)
389 # Additional ARCH settings for sh
394 KCONFIG_CONFIG ?= .config
395 export KCONFIG_CONFIG
397 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
398 export KBUILD_DEFCONFIG := defconfig
400 # SHELL used by kbuild
403 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
404 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
405 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
415 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
416 -O2 -fomit-frame-pointer -std=gnu89
417 export KBUILD_USERLDFLAGS :=
419 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
420 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
421 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
422 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
424 # Make variables (CC, etc...)
431 OBJCOPY = llvm-objcopy
432 OBJDUMP = llvm-objdump
433 READELF = llvm-readelf
436 CC = $(CROSS_COMPILE)gcc
437 LD = $(CROSS_COMPILE)ld
438 AR = $(CROSS_COMPILE)ar
439 NM = $(CROSS_COMPILE)nm
440 OBJCOPY = $(CROSS_COMPILE)objcopy
441 OBJDUMP = $(CROSS_COMPILE)objdump
442 READELF = $(CROSS_COMPILE)readelf
443 STRIP = $(CROSS_COMPILE)strip
446 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
450 INSTALLKERNEL := installkernel
464 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
465 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
474 # Use USERINCLUDE when you must reference the UAPI directories only.
476 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
477 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
478 -I$(srctree)/include/uapi \
479 -I$(objtree)/include/generated/uapi \
480 -include $(srctree)/include/linux/kconfig.h
482 # Use LINUXINCLUDE when you must reference the include/ directory.
483 # Needed to be compatible with the O= option
485 -I$(srctree)/arch/$(SRCARCH)/include \
486 -I$(objtree)/arch/$(SRCARCH)/include/generated \
487 $(if $(building_out_of_srctree),-I$(srctree)/include) \
488 -I$(objtree)/include \
491 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
492 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
493 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
494 -Werror=implicit-function-declaration -Werror=implicit-int \
495 -Werror=return-type -Wno-format-security \
497 KBUILD_CPPFLAGS := -D__KERNEL__
498 KBUILD_AFLAGS_KERNEL :=
499 KBUILD_CFLAGS_KERNEL :=
500 KBUILD_AFLAGS_MODULE := -DMODULE
501 KBUILD_CFLAGS_MODULE := -DMODULE
502 KBUILD_LDFLAGS_MODULE :=
506 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
507 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
508 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
509 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
510 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
512 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
513 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
514 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
515 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
516 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
518 # Files to ignore in find ... statements
520 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
521 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
523 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
524 --exclude CVS --exclude .pc --exclude .hg --exclude .git
526 # ===========================================================================
527 # Rules shared between *config targets and build targets
529 # Basic helpers built in scripts/basic/
530 PHONY += scripts_basic
532 $(Q)$(MAKE) $(build)=scripts/basic
533 $(Q)rm -f .tmp_quiet_recordmcount
535 PHONY += outputmakefile
536 # Before starting out-of-tree build, make sure the source tree is clean.
537 # outputmakefile generates a Makefile in the output directory, if using a
538 # separate output directory. This allows convenient use of make in the
540 # At the same time when output Makefile generated, generate .gitignore to
541 # ignore whole output directory
543 ifdef building_out_of_srctree
544 $(Q)if [ -f $(srctree)/.config -o \
545 -d $(srctree)/include/config -o \
546 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
548 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
549 echo >&2 "*** in $(abs_srctree)";\
553 $(Q)ln -fsn $(srctree) source
554 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
555 $(Q)test -e .gitignore || \
556 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
559 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
560 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
561 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
562 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
563 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1 | sed 's/\#//g')
565 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
566 ifneq ($(CROSS_COMPILE),)
567 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
568 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
569 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
570 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
572 ifneq ($(GCC_TOOLCHAIN),)
573 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
575 ifneq ($(LLVM_IAS),1)
576 CLANG_FLAGS += -no-integrated-as
578 CLANG_FLAGS += -Werror=unknown-warning-option
579 KBUILD_CFLAGS += $(CLANG_FLAGS)
580 KBUILD_AFLAGS += $(CLANG_FLAGS)
585 # ===========================================================================
586 # *config targets only - make sure prerequisites are updated, and descend
587 # in scripts/kconfig to make the *config target
589 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
590 # KBUILD_DEFCONFIG may point out an alternative default configuration
591 # used for 'make defconfig'
592 include arch/$(SRCARCH)/Makefile
593 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
595 config: outputmakefile scripts_basic FORCE
596 $(Q)$(MAKE) $(build)=scripts/kconfig $@
598 %config: outputmakefile scripts_basic FORCE
599 $(Q)$(MAKE) $(build)=scripts/kconfig $@
602 # ===========================================================================
603 # Build targets only - this includes vmlinux, arch specific targets, clean
604 # targets and others. In general all targets except *config targets.
606 # If building an external module we do not care about the all: rule
607 # but instead __all depend on modules
609 ifeq ($(KBUILD_EXTMOD),)
615 # Decide whether to build built-in, modular, or both.
616 # Normally, just do built-in.
621 # If we have only "make modules", don't compile built-in objects.
622 ifeq ($(MAKECMDGOALS),modules)
626 # If we have "make <whatever> modules", compile modules
627 # in addition to whatever we do anyway.
628 # Just "make" or "make all" shall build modules as well
630 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
634 ifeq ($(MAKECMDGOALS),)
638 export KBUILD_MODULES KBUILD_BUILTIN
641 include include/config/auto.conf
644 ifeq ($(KBUILD_EXTMOD),)
645 # Objects we will link into vmlinux / subdirs we need to visit
647 drivers-y := drivers/ sound/
648 drivers-$(CONFIG_SAMPLES) += samples/
649 drivers-$(CONFIG_NET) += net/
652 endif # KBUILD_EXTMOD
654 # The all: target is the default when no target is given on the
656 # This allow a user to issue only 'make' to build a kernel including modules
657 # Defaults to vmlinux, but the arch makefile usually adds further targets
660 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
661 $(call cc-option,-fno-tree-loop-im) \
662 $(call cc-disable-warning,maybe-uninitialized,)
665 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
666 ifdef CONFIG_FUNCTION_TRACER
667 CC_FLAGS_FTRACE := -pg
670 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
671 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
672 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
673 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
674 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
675 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
676 export RETPOLINE_CFLAGS
677 export RETPOLINE_VDSO_CFLAGS
679 include arch/$(SRCARCH)/Makefile
682 ifdef may-sync-config
683 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
684 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
685 # because some architectures define CROSS_COMPILE there.
686 include include/config/auto.conf.cmd
690 @echo >&2 '*** Configuration file "$@" not found!'
692 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
693 @echo >&2 '*** "make menuconfig" or "make xconfig").'
697 # The actual configuration files used during the build are stored in
698 # include/generated/ and include/config/. Update them if .config is newer than
699 # include/config/auto.conf (which mirrors .config).
701 # This exploits the 'multi-target pattern rule' trick.
702 # The syncconfig should be executed only once to make all the targets.
703 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
704 quiet_cmd_syncconfig = SYNC $@
705 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig
707 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
708 +$(call cmd,syncconfig)
709 else # !may-sync-config
710 # External modules and some install targets need include/generated/autoconf.h
711 # and include/config/auto.conf but do not care if they are up-to-date.
712 # Use auto.conf to trigger the test
713 PHONY += include/config/auto.conf
715 include/config/auto.conf:
716 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
718 echo >&2 " ERROR: Kernel configuration is invalid."; \
719 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
720 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
724 endif # may-sync-config
727 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
728 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
729 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
730 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
731 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
733 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
735 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
737 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
741 # Tell gcc to never replace conditional load with a non-conditional one
742 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
743 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
745 ifdef CONFIG_READABLE_ASM
746 # Disable optimizations that make assembler listings hard to read.
747 # reorder blocks reorders the control in the function
748 # ipa clone creates specialized cloned functions
749 # partial inlining inlines only parts of functions
750 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
751 $(call cc-option,-fno-ipa-cp-clone,) \
752 $(call cc-option,-fno-partial-inlining)
755 ifneq ($(CONFIG_FRAME_WARN),0)
756 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
759 stackp-flags-y := -fno-stack-protector
760 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
761 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
763 KBUILD_CFLAGS += $(stackp-flags-y)
765 ifdef CONFIG_CC_IS_CLANG
766 KBUILD_CPPFLAGS += -Qunused-arguments
767 KBUILD_CFLAGS += -Wno-format-invalid-specifier
768 KBUILD_CFLAGS += -Wno-gnu
769 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
770 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
771 # See modpost pattern 2
772 KBUILD_CFLAGS += -mno-global-merge
775 # These warnings generated too much noise in a regular build.
776 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
777 KBUILD_CFLAGS += -Wno-unused-but-set-variable
779 # Warn about unmarked fall-throughs in switch statement.
780 # Disabled for clang while comment to attribute conversion happens and
781 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
782 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
785 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
786 ifdef CONFIG_FRAME_POINTER
787 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
789 # Some targets (ARM with Thumb2, for example), can't be built with frame
790 # pointers. For those, we don't have FUNCTION_TRACER automatically
791 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
792 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
793 # -fomit-frame-pointer with FUNCTION_TRACER.
794 ifndef CONFIG_FUNCTION_TRACER
795 KBUILD_CFLAGS += -fomit-frame-pointer
799 # Initialize all stack variables with a 0xAA pattern.
800 ifdef CONFIG_INIT_STACK_ALL_PATTERN
801 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
804 # Initialize all stack variables with a zero value.
805 ifdef CONFIG_INIT_STACK_ALL_ZERO
806 # Future support for zero initialization is still being debated, see
807 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
808 # renamed or dropped.
809 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
810 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
815 # Workaround for GCC versions < 5.0
816 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
817 ifdef CONFIG_CC_IS_GCC
818 DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
821 ifdef CONFIG_DEBUG_INFO
823 ifdef CONFIG_DEBUG_INFO_SPLIT
824 DEBUG_CFLAGS += -gsplit-dwarf
829 ifneq ($(LLVM_IAS),1)
830 KBUILD_AFLAGS += -Wa,-gdwarf-2
833 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
834 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
835 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
836 DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
839 ifdef CONFIG_DEBUG_INFO_REDUCED
840 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
841 $(call cc-option,-fno-var-tracking)
844 ifdef CONFIG_DEBUG_INFO_COMPRESSED
845 DEBUG_CFLAGS += -gz=zlib
846 KBUILD_AFLAGS += -gz=zlib
847 KBUILD_LDFLAGS += --compress-debug-sections=zlib
850 endif # CONFIG_DEBUG_INFO
852 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
855 ifdef CONFIG_FUNCTION_TRACER
856 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
857 CC_FLAGS_FTRACE += -mrecord-mcount
858 ifdef CONFIG_HAVE_NOP_MCOUNT
859 ifeq ($(call cc-option-yn, -mnop-mcount),y)
860 CC_FLAGS_FTRACE += -mnop-mcount
861 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
865 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
866 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
868 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
869 ifdef CONFIG_HAVE_C_RECORDMCOUNT
870 BUILD_C_RECORDMCOUNT := y
871 export BUILD_C_RECORDMCOUNT
874 ifdef CONFIG_HAVE_FENTRY
875 ifeq ($(call cc-option-yn, -mfentry),y)
876 CC_FLAGS_FTRACE += -mfentry
877 CC_FLAGS_USING += -DCC_USING_FENTRY
880 export CC_FLAGS_FTRACE
881 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
882 KBUILD_AFLAGS += $(CC_FLAGS_USING)
885 # We trigger additional mismatches with less inlining
886 ifdef CONFIG_DEBUG_SECTION_MISMATCH
887 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
890 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
891 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
892 LDFLAGS_vmlinux += --gc-sections
895 ifdef CONFIG_SHADOW_CALL_STACK
896 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
897 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
901 ifdef CONFIG_LTO_CLANG
902 ifdef CONFIG_LTO_CLANG_THIN
903 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
904 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache
906 CC_FLAGS_LTO := -flto
908 CC_FLAGS_LTO += -fvisibility=hidden
910 # Limit inlining across translation units to reduce binary size
911 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
915 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
916 KBUILD_AFLAGS += -fno-lto
920 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
921 KBUILD_CFLAGS += -falign-functions=32
924 # arch Makefile may override CC so keep this after arch Makefile is included
925 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
927 # warn about C99 declaration after statement
928 KBUILD_CFLAGS += -Wdeclaration-after-statement
930 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
931 KBUILD_CFLAGS += -Wvla
933 # disable pointer signed / unsigned warnings in gcc 4.0
934 KBUILD_CFLAGS += -Wno-pointer-sign
936 # disable stringop warnings in gcc 8+
937 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
939 # We'll want to enable this eventually, but it's not going away for 5.7 at least
940 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
941 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
942 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
944 # Another good warning that we'll want to enable eventually
945 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
947 # Enabled with W=2, disabled by default as noisy
948 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
950 # disable invalid "can't wrap" optimizations for signed / pointers
951 KBUILD_CFLAGS += -fno-strict-overflow
953 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
954 KBUILD_CFLAGS += -fno-stack-check
956 # conserve stack if available
957 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
959 # Prohibit date/time macros, which would make the build non-deterministic
960 KBUILD_CFLAGS += -Werror=date-time
962 # enforce correct pointer usage
963 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
965 # Require designated initializers for all marked structures
966 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
968 # change __FILE__ to the relative path from the srctree
969 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
971 # include additional Makefiles when needed
972 include-y := scripts/Makefile.extrawarn
973 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
974 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
975 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
976 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
977 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
979 include $(addprefix $(srctree)/, $(include-y))
981 # scripts/Makefile.gcc-plugins is intentionally included last.
982 # Do not add $(call cc-option,...) below this line. When you build the kernel
983 # from the clean source tree, the GCC plugins do not exist at this point.
985 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
986 KBUILD_CPPFLAGS += $(KCPPFLAGS)
987 KBUILD_AFLAGS += $(KAFLAGS)
988 KBUILD_CFLAGS += $(KCFLAGS)
990 KBUILD_LDFLAGS_MODULE += --build-id=sha1
991 LDFLAGS_vmlinux += --build-id=sha1
993 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
994 LDFLAGS_vmlinux += $(call ld-option, -X,)
997 ifeq ($(CONFIG_RELR),y)
998 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
1001 # We never want expected sections to be placed heuristically by the
1002 # linker. All sections should be explicitly named in the linker script.
1003 ifdef CONFIG_LD_ORPHAN_WARN
1004 LDFLAGS_vmlinux += --orphan-handling=warn
1007 # Align the bit size of userspace programs with the kernel
1008 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1009 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1011 # make the checker run with the right architecture
1012 CHECKFLAGS += --arch=$(ARCH)
1014 # insure the checker run with the right endianness
1015 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1017 # the checker needs the correct machine size
1018 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1020 # Default kernel image to build when no specific target is given.
1021 # KBUILD_IMAGE may be overruled on the command line or
1022 # set in the environment
1023 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1024 # this default value
1025 export KBUILD_IMAGE ?= vmlinux
1028 # INSTALL_PATH specifies where to place the updated kernel and system map
1029 # images. Default is /boot, but you can set it to other values
1030 export INSTALL_PATH ?= /boot
1033 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1034 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1035 # an argument if needed. Otherwise it defaults to the kernel install path
1037 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1040 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1041 # relocations required by build roots. This is not defined in the
1042 # makefile but the argument can be passed to make if needed.
1045 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1049 # INSTALL_MOD_STRIP, if defined, will cause modules to be
1050 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1051 # the default option --strip-debug will be used. Otherwise,
1052 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1054 ifdef INSTALL_MOD_STRIP
1055 ifeq ($(INSTALL_MOD_STRIP),1)
1056 mod_strip_cmd = $(STRIP) --strip-debug
1058 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1059 endif # INSTALL_MOD_STRIP=1
1061 mod_strip_cmd = true
1062 endif # INSTALL_MOD_STRIP
1063 export mod_strip_cmd
1065 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1066 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1067 # or CONFIG_MODULE_COMPRESS_XZ.
1069 mod_compress_cmd = true
1070 ifdef CONFIG_MODULE_COMPRESS
1071 ifdef CONFIG_MODULE_COMPRESS_GZIP
1072 mod_compress_cmd = $(KGZIP) -n -f
1073 endif # CONFIG_MODULE_COMPRESS_GZIP
1074 ifdef CONFIG_MODULE_COMPRESS_XZ
1075 mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f
1076 endif # CONFIG_MODULE_COMPRESS_XZ
1077 endif # CONFIG_MODULE_COMPRESS
1078 export mod_compress_cmd
1080 ifdef CONFIG_MODULE_SIG_ALL
1081 $(eval $(call config_filename,MODULE_SIG_KEY))
1083 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1089 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1091 has_libelf = $(call try-run,\
1092 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1094 ifdef CONFIG_STACK_VALIDATION
1095 ifeq ($(has_libelf),1)
1096 objtool_target := tools/objtool FORCE
1098 SKIP_STACK_VALIDATION := 1
1099 export SKIP_STACK_VALIDATION
1103 PHONY += resolve_btfids_clean
1105 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1107 # tools/bpf/resolve_btfids directory might not exist
1108 # in output directory, skip its clean in that case
1109 resolve_btfids_clean:
1110 ifneq ($(wildcard $(resolve_btfids_O)),)
1111 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1115 ifdef CONFIG_DEBUG_INFO_BTF
1116 ifeq ($(has_libelf),1)
1117 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1119 ERROR_RESOLVE_BTFIDS := 1
1121 endif # CONFIG_DEBUG_INFO_BTF
1126 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1127 export MODORDER := $(extmod-prefix)modules.order
1128 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1130 ifeq ($(KBUILD_EXTMOD),)
1131 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1133 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1134 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1135 $(libs-y) $(libs-m)))
1137 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1138 $(patsubst %/,%,$(filter %/, $(core-) \
1139 $(drivers-) $(libs-))))
1141 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1142 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1143 $(drivers-y) $(drivers-m)))
1145 build-dirs := $(vmlinux-dirs)
1146 clean-dirs := $(vmlinux-alldirs)
1148 # Externally visible symbols (used by link-vmlinux.sh)
1149 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1150 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1151 ifdef CONFIG_MODULES
1152 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1153 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1155 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1157 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1159 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1160 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1161 # used by scripts/Makefile.package
1162 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1164 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1166 # Recurse until adjust_autoksyms.sh is satisfied
1167 PHONY += autoksyms_recursive
1168 ifdef CONFIG_TRIM_UNUSED_KSYMS
1169 # For the kernel to actually contain only the needed exported symbols,
1170 # we have to build modules as well to determine what those symbols are.
1171 # (this can be evaluated only once include/config/auto.conf has been included)
1174 autoksyms_recursive: descend modules.order
1175 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1176 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1179 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1181 quiet_cmd_autoksyms_h = GEN $@
1182 cmd_autoksyms_h = mkdir -p $(dir $@); \
1183 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1186 $(call cmd,autoksyms_h)
1188 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1190 # Final link of vmlinux with optional arch pass after final link
1191 cmd_link-vmlinux = \
1192 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1193 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1195 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1196 +$(call if_changed,link-vmlinux)
1200 # The actual objects are generated when descending,
1201 # make sure no implicit rule kicks in
1202 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1204 filechk_kernel.release = \
1205 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1207 # Store (new) KERNELRELEASE string in include/config/kernel.release
1208 include/config/kernel.release: FORCE
1209 $(call filechk,kernel.release)
1211 # Additional helpers built in scripts/
1212 # Carefully list dependencies so we do not try to build scripts twice
1215 scripts: scripts_basic scripts_dtc
1216 $(Q)$(MAKE) $(build)=$(@)
1218 # Things we need to do before we recursively start building the kernel
1219 # or the modules are listed in "prepare".
1220 # A multi level approach is used. prepareN is processed before prepareN-1.
1221 # archprepare is used in arch Makefiles and when processed asm symlink,
1222 # version.h and scripts_basic is processed / created.
1224 PHONY += prepare archprepare
1226 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1227 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1228 include/generated/autoconf.h
1230 prepare0: archprepare
1231 $(Q)$(MAKE) $(build)=scripts/mod
1232 $(Q)$(MAKE) $(build)=.
1234 # All the preparing..
1235 prepare: prepare0 prepare-objtool prepare-resolve_btfids
1237 # Support for using generic headers in asm-generic
1238 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1240 PHONY += asm-generic uapi-asm-generic
1241 asm-generic: uapi-asm-generic
1242 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1243 generic=include/asm-generic
1245 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1246 generic=include/uapi/asm-generic
1248 PHONY += prepare-objtool prepare-resolve_btfids
1249 prepare-objtool: $(objtool_target)
1250 ifeq ($(SKIP_STACK_VALIDATION),1)
1251 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
1252 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1255 ifdef CONFIG_UNWINDER_ORC
1256 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1259 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1263 prepare-resolve_btfids: $(resolve_btfids_target)
1264 ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1265 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1268 # Generate some files
1269 # ---------------------------------------------------------------------------
1271 # KERNELRELEASE can change from a few different places, meaning version.h
1272 # needs to be updated, so this check is forced on all builds
1275 define filechk_utsrelease.h
1276 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1277 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1280 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1283 define filechk_version.h
1284 if [ $(SUBLEVEL) -gt 255 ]; then \
1285 echo \#define LINUX_VERSION_CODE $(shell \
1286 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 255); \
1288 echo \#define LINUX_VERSION_CODE $(shell \
1289 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1291 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1292 ((c) > 255 ? 255 : (c)))'; \
1293 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1294 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1295 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1299 $(call filechk,version.h)
1301 include/generated/utsrelease.h: include/config/kernel.release FORCE
1302 $(call filechk,utsrelease.h)
1306 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1307 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1309 # ---------------------------------------------------------------------------
1312 #Default location for installed headers
1313 export INSTALL_HDR_PATH = $(objtree)/usr
1315 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1316 cmd_headers_install = \
1317 mkdir -p $(INSTALL_HDR_PATH); \
1318 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1319 usr/include $(INSTALL_HDR_PATH)
1321 PHONY += headers_install
1322 headers_install: headers
1323 $(call cmd,headers_install)
1325 PHONY += archheaders archscripts
1327 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1330 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1331 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1332 $(error Headers not exportable for the $(SRCARCH) architecture))
1333 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1334 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1336 # Deprecated. It is no-op now.
1337 PHONY += headers_check
1341 ifdef CONFIG_HEADERS_INSTALL
1345 PHONY += scripts_unifdef
1346 scripts_unifdef: scripts_basic
1347 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1349 # ---------------------------------------------------------------------------
1354 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1357 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1359 PHONY += kselftest-merge
1361 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1362 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1363 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1364 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1366 # ---------------------------------------------------------------------------
1369 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1370 dtstree := arch/$(SRCARCH)/boot/dts
1375 %.dtb: include/config/kernel.release scripts_dtc
1376 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1378 %.dtbo: include/config/kernel.release scripts_dtc
1379 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1381 PHONY += dtbs dtbs_install dtbs_check
1382 dtbs: include/config/kernel.release scripts_dtc
1383 $(Q)$(MAKE) $(build)=$(dtstree)
1385 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1387 dtbs: dt_binding_check
1393 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1395 ifdef CONFIG_OF_EARLY_FLATTREE
1401 PHONY += scripts_dtc
1402 scripts_dtc: scripts_basic
1403 $(Q)$(MAKE) $(build)=scripts/dtc
1405 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1406 export CHECK_DT_BINDING=y
1409 PHONY += dt_binding_check
1410 dt_binding_check: scripts_dtc
1411 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1413 # ---------------------------------------------------------------------------
1416 ifdef CONFIG_MODULES
1418 # By default, build modules as well
1422 # When we're building modules with modversions, we need to consider
1423 # the built-in objects during the descend as well, in order to
1424 # make sure the checksums are up to date before we record them.
1425 ifdef CONFIG_MODVERSIONS
1431 # A module can be listed more than once in obj-m resulting in
1432 # duplicate lines in modules.order files. Those are removed
1433 # using awk while concatenating to the final file.
1436 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1437 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1439 PHONY += modules_check
1440 modules_check: modules.order
1441 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1443 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1445 modules.order: $(subdir-modorder) FORCE
1446 $(call if_changed,modules_order)
1448 targets += modules.order
1450 # Target to prepare building external modules
1451 PHONY += modules_prepare
1452 modules_prepare: prepare
1453 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1455 # Target to install modules
1456 PHONY += modules_install
1457 modules_install: _modinst_ _modinst_post
1461 @rm -rf $(MODLIB)/kernel
1462 @rm -f $(MODLIB)/source
1463 @mkdir -p $(MODLIB)/kernel
1464 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1465 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1466 rm -f $(MODLIB)/build ; \
1467 ln -s $(CURDIR) $(MODLIB)/build ; \
1469 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1470 @cp -f modules.builtin $(MODLIB)/
1471 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1472 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1474 # This depmod is only for convenience to give the initial
1475 # boot a modules.dep even before / is mounted read-write. However the
1476 # boot script depmod is the master version.
1477 PHONY += _modinst_post
1478 _modinst_post: _modinst_
1481 ifeq ($(CONFIG_MODULE_SIG), y)
1482 PHONY += modules_sign
1484 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1487 else # CONFIG_MODULES
1489 # Modules not configured
1490 # ---------------------------------------------------------------------------
1492 PHONY += modules modules_install
1493 modules modules_install:
1495 @echo >&2 "The present kernel configuration has modules disabled."
1496 @echo >&2 "Type 'make config' and enable loadable module support."
1497 @echo >&2 "Then build a kernel with module support enabled."
1501 endif # CONFIG_MODULES
1504 # Cleaning is done on three levels.
1505 # make clean Delete most generated files
1506 # Leave enough to build external modules
1507 # make mrproper Delete the current configuration, and all generated files
1508 # make distclean Remove editor backup files, patch leftover files and the like
1510 # Directories & files removed with 'make clean'
1511 CLEAN_FILES += include/ksym vmlinux.symvers \
1512 modules.builtin modules.builtin.modinfo modules.nsdeps \
1513 compile_commands.json .thinlto-cache
1515 # Directories & files removed with 'make mrproper'
1516 MRPROPER_FILES += include/config include/generated \
1517 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1518 debian snap tar-install \
1519 .config .config.old .version \
1521 signing_key.pem signing_key.priv signing_key.x509 \
1522 x509.genkey extra_certificates signing_key.x509.keyid \
1523 signing_key.x509.signer vmlinux-gdb.py \
1526 # Directories & files removed with 'make distclean'
1527 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1529 # clean - Delete most, but leave enough to build external modules
1531 clean: rm-files := $(CLEAN_FILES)
1533 PHONY += archclean vmlinuxclean
1536 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1537 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1539 clean: archclean vmlinuxclean resolve_btfids_clean
1541 # mrproper - Delete all generated files, including .config
1543 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1544 mrproper-dirs := $(addprefix _mrproper_,scripts)
1546 PHONY += $(mrproper-dirs) mrproper
1548 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1550 mrproper: clean $(mrproper-dirs)
1555 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1561 @find $(srctree) $(RCS_FIND_IGNORE) \
1562 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1563 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1564 -o -name 'core' \) \
1565 -type f -print | xargs rm -f
1568 # Packaging of the kernel to various formats
1569 # ---------------------------------------------------------------------------
1572 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1573 %pkg: include/config/kernel.release FORCE
1574 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1576 # Brief documentation of the typical targets used
1577 # ---------------------------------------------------------------------------
1579 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1580 boards := $(sort $(notdir $(boards)))
1581 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1582 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1586 @echo 'Cleaning targets:'
1587 @echo ' clean - Remove most generated files but keep the config and'
1588 @echo ' enough build support to build external modules'
1589 @echo ' mrproper - Remove all generated files + config + various backup files'
1590 @echo ' distclean - mrproper + remove editor backup and patch files'
1592 @echo 'Configuration targets:'
1593 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1595 @echo 'Other generic targets:'
1596 @echo ' all - Build all targets marked with [*]'
1597 @echo '* vmlinux - Build the bare kernel'
1598 @echo '* modules - Build all modules'
1599 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1600 @echo ' dir/ - Build all files in dir and below'
1601 @echo ' dir/file.[ois] - Build specified target only'
1602 @echo ' dir/file.ll - Build the LLVM assembly file'
1603 @echo ' (requires compiler support for LLVM assembly generation)'
1604 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1605 @echo ' (requires a recent binutils and recent build (System.map))'
1606 @echo ' dir/file.ko - Build module including final link'
1607 @echo ' modules_prepare - Set up for building external modules'
1608 @echo ' tags/TAGS - Generate tags file for editors'
1609 @echo ' cscope - Generate cscope index'
1610 @echo ' gtags - Generate GNU GLOBAL index'
1611 @echo ' kernelrelease - Output the release version string (use with make -s)'
1612 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1613 @echo ' image_name - Output the image name (use with make -s)'
1614 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1615 echo ' (default: $(INSTALL_HDR_PATH))'; \
1617 @echo 'Static analysers:'
1618 @echo ' checkstack - Generate a list of stack hogs'
1619 @echo ' versioncheck - Sanity check on version.h usage'
1620 @echo ' includecheck - Check for duplicate included header files'
1621 @echo ' export_report - List the usages of all exported symbols'
1622 @echo ' headerdep - Detect inclusion cycles in headers'
1623 @echo ' coccicheck - Check with Coccinelle'
1624 @echo ' clang-analyzer - Check with clang static analyzer'
1625 @echo ' clang-tidy - Check with clang-tidy'
1628 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1630 @echo 'Kernel selftest:'
1631 @echo ' kselftest - Build and run kernel selftest'
1632 @echo ' Build, install, and boot kernel before'
1633 @echo ' running kselftest on it'
1634 @echo ' Run as root for full coverage'
1635 @echo ' kselftest-all - Build kernel selftest'
1636 @echo ' kselftest-install - Build and install kernel selftest'
1637 @echo ' kselftest-clean - Remove all generated kselftest files'
1638 @echo ' kselftest-merge - Merge all the config dependencies of'
1639 @echo ' kselftest to existing .config.'
1642 echo 'Devicetree:'; \
1643 echo '* dtbs - Build device tree blobs for enabled boards'; \
1644 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1645 echo ' dt_binding_check - Validate device tree binding documents'; \
1646 echo ' dtbs_check - Validate device tree source files';\
1649 @echo 'Userspace tools targets:'
1650 @echo ' use "make tools/help"'
1651 @echo ' or "cd tools; make help"'
1653 @echo 'Kernel packaging:'
1654 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1656 @echo 'Documentation targets:'
1657 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1659 @echo 'Architecture specific targets ($(SRCARCH)):'
1660 @$(if $(archhelp),$(archhelp),\
1661 echo ' No architecture specific help defined for $(SRCARCH)')
1664 $(foreach b, $(boards), \
1665 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1667 @$(if $(board-dirs), \
1668 $(foreach b, $(board-dirs), \
1669 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1670 printf " %-16s - Show all of the above\\n" help-boards; \
1673 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1674 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1675 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1676 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1677 @echo ' (sparse by default)'
1678 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1679 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1680 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1681 @echo ' 1: warnings which may be relevant and do not occur too often'
1682 @echo ' 2: warnings which occur quite often but may still be relevant'
1683 @echo ' 3: more obscure warnings, can most likely be ignored'
1684 @echo ' Multiple levels can be combined with W=12 or W=123'
1686 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1687 @echo 'For further info see the ./README file'
1690 help-board-dirs := $(addprefix help-,$(board-dirs))
1692 help-boards: $(help-board-dirs)
1694 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1696 $(help-board-dirs): help-%:
1697 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1698 @$(if $(boards-per-dir), \
1699 $(foreach b, $(boards-per-dir), \
1700 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1704 # Documentation targets
1705 # ---------------------------------------------------------------------------
1706 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1707 linkcheckdocs dochelp refcheckdocs
1708 PHONY += $(DOC_TARGETS)
1710 $(Q)$(MAKE) $(build)=Documentation $@
1713 # ---------------------------------------------------------------------------
1715 PHONY += scripts_gdb
1716 scripts_gdb: prepare0
1717 $(Q)$(MAKE) $(build)=scripts/gdb
1718 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1720 ifdef CONFIG_GDB_SCRIPTS
1724 else # KBUILD_EXTMOD
1727 # External module support.
1728 # When building external modules the kernel used as basis is considered
1729 # read-only, and no consistency checks are made and the make
1730 # system is not used on the basis kernel. If updates are required
1731 # in the basis kernel ordinary make commands (without M=...) must
1734 # The following are the only valid targets when building external
1736 # make M=dir clean Delete all automatically generated files
1737 # make M=dir modules Make all modules in specified dir
1738 # make M=dir Same as 'make M=dir modules'
1739 # make M=dir modules_install
1740 # Install the modules built in the module directory
1741 # Assumes install directory is already created
1743 # We are always building only modules.
1747 build-dirs := $(KBUILD_EXTMOD)
1749 modules: $(MODORDER)
1750 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1752 $(MODORDER): descend
1755 PHONY += modules_install
1756 modules_install: _emodinst_ _emodinst_post
1758 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1761 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1762 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1764 PHONY += _emodinst_post
1765 _emodinst_post: _emodinst_
1768 compile_commands.json: $(extmod-prefix)compile_commands.json
1769 PHONY += compile_commands.json
1771 clean-dirs := $(KBUILD_EXTMOD)
1772 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1773 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1777 @echo ' Building external modules.'
1778 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1780 @echo ' modules - default target, build the module(s)'
1781 @echo ' modules_install - install the module'
1782 @echo ' clean - remove generated files in module directory only'
1785 # no-op for external module builds
1786 PHONY += prepare modules_prepare
1788 endif # KBUILD_EXTMOD
1791 # ---------------------------------------------------------------------------
1792 # To build individual files in subdirectories, you can do like this:
1794 # make foo/bar/baz.s
1796 # The supported suffixes for single-target are listed in 'single-targets'
1798 # To build only under specific subdirectories, you can do like this:
1804 # .ko is special because modpost is needed
1805 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1806 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1808 $(single-ko): single_modpost
1810 $(single-no-ko): descend
1813 ifeq ($(KBUILD_EXTMOD),)
1814 # For the single build of in-tree modules, use a temporary file to avoid
1815 # the situation of modules_install installing an invalid modules.order.
1816 MODORDER := .modules.tmp
1819 PHONY += single_modpost
1820 single_modpost: $(single-no-ko) modules_prepare
1821 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1822 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1826 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1828 # trim unrelated directories
1829 build-dirs := $(foreach d, $(build-dirs), \
1830 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1834 ifndef CONFIG_MODULES
1838 # Handle descending into subdirectories listed in $(build-dirs)
1839 # Preset locale variables to speed up the build process. Limit locale
1840 # tweaks to this spot to avoid wrong language settings when running
1841 # make menuconfig etc.
1842 # Error messages still appears in the original language
1843 PHONY += descend $(build-dirs)
1844 descend: $(build-dirs)
1845 $(build-dirs): prepare
1846 $(Q)$(MAKE) $(build)=$@ \
1847 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1848 need-builtin=1 need-modorder=1
1850 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1851 PHONY += $(clean-dirs) clean
1853 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1855 clean: $(clean-dirs)
1857 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1858 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1860 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1861 -o -name '*.dwo' -o -name '*.lst' \
1862 -o -name '*.su' -o -name '*.mod' \
1863 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1864 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1865 -o -name '*.asn1.[ch]' \
1866 -o -name '*.symtypes' -o -name 'modules.order' \
1867 -o -name '.tmp_*.o.*' \
1868 -o -name '*.c.[012]*.*' \
1871 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1873 # Generate tags for editors
1874 # ---------------------------------------------------------------------------
1875 quiet_cmd_tags = GEN $@
1876 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1878 tags TAGS cscope gtags: FORCE
1881 # Script to generate missing namespace dependencies
1882 # ---------------------------------------------------------------------------
1885 nsdeps: export KBUILD_NSDEPS=1
1887 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1890 # ---------------------------------------------------------------------------
1892 quiet_cmd_gen_compile_commands = GEN $@
1893 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1895 $(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1896 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1897 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1898 $(call if_changed,gen_compile_commands)
1900 targets += $(extmod-prefix)compile_commands.json
1902 PHONY += clang-tidy clang-analyzer
1904 ifdef CONFIG_CC_IS_CLANG
1905 quiet_cmd_clang_tools = CHECK $<
1906 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1908 clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
1909 $(call cmd,clang_tools)
1911 clang-tidy clang-analyzer:
1912 @echo "$@ requires CC=clang" >&2
1916 # Scripts to check various things for consistency
1917 # ---------------------------------------------------------------------------
1919 PHONY += includecheck versioncheck coccicheck export_report
1922 find $(srctree)/* $(RCS_FIND_IGNORE) \
1923 -name '*.[hcS]' -type f -print | sort \
1924 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1927 find $(srctree)/* $(RCS_FIND_IGNORE) \
1928 -name '*.[hcS]' -type f -print | sort \
1929 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1932 $(Q)$(BASH) $(srctree)/scripts/$@
1935 $(PERL) $(srctree)/scripts/export_report.pl
1937 PHONY += checkstack kernelrelease kernelversion image_name
1939 # UML needs a little special treatment here. It wants to use the host
1940 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1941 # else wants $(ARCH), including people doing cross-builds, which means
1942 # that $(SUBARCH) doesn't work here.
1944 CHECKSTACK_ARCH := $(SUBARCH)
1946 CHECKSTACK_ARCH := $(ARCH)
1949 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1950 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1953 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1956 @echo $(KERNELVERSION)
1959 @echo $(KBUILD_IMAGE)
1961 # Clear a bunch of variables before executing the submake
1963 ifeq ($(quiet),silent_)
1968 $(Q)mkdir -p $(objtree)/tools
1969 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1972 $(Q)mkdir -p $(objtree)/tools
1973 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1975 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1976 cmd_rmfiles = rm -rf $(rm-files)
1978 # Run depmod only if we have System.map and depmod is executable
1979 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1980 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1983 # read saved command lines for existing targets
1984 existing-targets := $(wildcard $(sort $(targets)))
1986 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1988 endif # config-build
1990 endif # need-sub-make
1995 # Declare the contents of the PHONY variable as phony. We keep that
1996 # information in a variable so we can use it in if_changed and friends.