1 # SPDX-License-Identifier: GPL-2.0
6 NAME = Dare mighty things
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 # Kbuild will save output files in the current working directory.
104 # This does not need to match to the root of the kernel source tree.
106 # For example, you can do this:
108 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
110 # If you want to save output files in a different location, there are
111 # two syntaxes to specify it.
114 # Use "make O=dir/to/store/output/files/"
116 # 2) Set KBUILD_OUTPUT
117 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
118 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
120 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
123 # Do we want to change the working directory?
124 ifeq ("$(origin O)", "command line")
125 KBUILD_OUTPUT := $(O)
128 ifneq ($(KBUILD_OUTPUT),)
129 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
130 # expand a shell special character '~'. We use a somewhat tedious way here.
131 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
132 $(if $(abs_objtree),, \
133 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
135 # $(realpath ...) resolves symlinks
136 abs_objtree := $(realpath $(abs_objtree))
138 abs_objtree := $(CURDIR)
139 endif # ifneq ($(KBUILD_OUTPUT),)
141 ifeq ($(abs_objtree),$(CURDIR))
142 # Suppress "Entering directory ..." unless we are changing the work directory.
143 MAKEFLAGS += --no-print-directory
148 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
150 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
151 $(error source directory cannot contain spaces or colons)
154 ifneq ($(abs_srctree),$(abs_objtree))
155 # Look for make include files relative to root of kernel src
157 # This does not become effective immediately because MAKEFLAGS is re-parsed
158 # once after the Makefile is read. We need to invoke sub-make.
159 MAKEFLAGS += --include-dir=$(abs_srctree)
163 this-makefile := $(lastword $(MAKEFILE_LIST))
165 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
166 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
167 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
169 # Cancel implicit rules for this Makefile.
173 export abs_srctree abs_objtree
174 export sub_make_done := 1
176 ifeq ($(need-sub-make),1)
178 PHONY += $(MAKECMDGOALS) __sub-make
180 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
183 # Invoke a second make in the output directory, passing relevant variables
185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
187 endif # need-sub-make
188 endif # sub_make_done
190 # We process the rest of the Makefile if this is the final invocation of make
191 ifeq ($(need-sub-make),)
193 # Do not print "Entering directory ...",
194 # but we want to display it when entering to the output directory
195 # so that IDEs/editors are able to understand relative filenames.
196 MAKEFLAGS += --no-print-directory
198 # Call a source code checker (by default, "sparse") as part of the
201 # Use 'make C=1' to enable checking of only re-compiled files.
202 # Use 'make C=2' to enable checking of *all* source files, regardless
203 # of whether they are re-compiled or not.
205 # See the file "Documentation/dev-tools/sparse.rst" for more details,
206 # including where to get the "sparse" utility.
208 ifeq ("$(origin C)", "command line")
209 KBUILD_CHECKSRC = $(C)
211 ifndef KBUILD_CHECKSRC
215 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
216 # directory of external module to build. Setting M= takes precedence.
217 ifeq ("$(origin M)", "command line")
218 KBUILD_EXTMOD := $(M)
221 $(if $(word 2, $(KBUILD_EXTMOD)), \
222 $(error building multiple external modules is not supported))
224 export KBUILD_CHECKSRC KBUILD_EXTMOD
226 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
228 ifeq ($(abs_srctree),$(abs_objtree))
229 # building in the source tree
231 building_out_of_srctree :=
233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
234 # building in a subdirectory of the source tree
237 srctree := $(abs_srctree)
239 building_out_of_srctree := 1
242 ifneq ($(KBUILD_ABS_SRCTREE),)
243 srctree := $(abs_srctree)
249 export building_out_of_srctree srctree objtree VPATH
251 # To make sure we do not include .config for any of the *config targets
252 # catch them early, and hand them over to scripts/kconfig/Makefile
253 # It is allowed to specify more targets when calling make, including
254 # mixing *config targets and build targets.
255 # For example 'make oldconfig all'.
256 # Detect when mixed targets is specified, and make a second invocation
257 # of make so .config is not included in this case either (for *config).
259 version_h := include/generated/uapi/linux/version.h
260 old_version_h := include/linux/version.h
262 clean-targets := %clean mrproper cleandocs
263 no-dot-config-targets := $(clean-targets) \
264 cscope gtags TAGS tags help% %docs check% coccicheck \
265 $(version_h) headers headers_% archheaders archscripts \
266 %asm-generic kernelversion %src-pkg dt_binding_check \
268 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
270 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
278 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
279 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
284 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
285 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
290 ifneq ($(KBUILD_EXTMOD),)
294 ifeq ($(KBUILD_EXTMOD),)
295 ifneq ($(filter %config,$(MAKECMDGOALS)),)
297 ifneq ($(words $(MAKECMDGOALS)),1)
303 # We cannot build single targets and the others at the same time
304 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
306 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
311 # For "make -j clean all", "make -j mrproper defconfig all", etc.
312 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
313 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
318 # install and modules_install need also be processed one by one
319 ifneq ($(filter install,$(MAKECMDGOALS)),)
320 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
326 # ===========================================================================
327 # We're called with mixed targets (*config and build targets).
328 # Handle them one by one.
330 PHONY += $(MAKECMDGOALS) __build_one_by_one
332 $(MAKECMDGOALS): __build_one_by_one
337 for i in $(MAKECMDGOALS); do \
338 $(MAKE) -f $(srctree)/Makefile $$i; \
343 include scripts/Kbuild.include
345 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
346 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
347 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
348 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
350 include scripts/subarch.include
352 # Cross compiling and selecting different set of gcc/bin-utils
353 # ---------------------------------------------------------------------------
355 # When performing cross compilation for other architectures ARCH shall be set
356 # to the target architecture. (See arch/* for the possibilities).
357 # ARCH can be set during invocation of make:
359 # Another way is to have ARCH set in the environment.
360 # The default ARCH is the host where make is executed.
362 # CROSS_COMPILE specify the prefix used for all executables used
363 # during compilation. Only gcc and related bin-utils executables
364 # are prefixed with $(CROSS_COMPILE).
365 # CROSS_COMPILE can be set on the command line
366 # make CROSS_COMPILE=ia64-linux-
367 # Alternatively CROSS_COMPILE can be set in the environment.
368 # Default value for CROSS_COMPILE is not to prefix executables
369 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
372 # Architecture as present in compile.h
373 UTS_MACHINE := $(ARCH)
376 # Additional ARCH settings for x86
380 ifeq ($(ARCH),x86_64)
384 # Additional ARCH settings for sparc
385 ifeq ($(ARCH),sparc32)
388 ifeq ($(ARCH),sparc64)
392 # Additional ARCH settings for sh
397 KCONFIG_CONFIG ?= .config
398 export KCONFIG_CONFIG
400 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
401 export KBUILD_DEFCONFIG := defconfig
403 # SHELL used by kbuild
406 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
407 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
408 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
418 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
419 -O2 -fomit-frame-pointer -std=gnu89
420 export KBUILD_USERLDFLAGS :=
422 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
423 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
424 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
425 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
427 # Make variables (CC, etc...)
434 OBJCOPY = llvm-objcopy
435 OBJDUMP = llvm-objdump
436 READELF = llvm-readelf
439 CC = $(CROSS_COMPILE)gcc
440 LD = $(CROSS_COMPILE)ld
441 AR = $(CROSS_COMPILE)ar
442 NM = $(CROSS_COMPILE)nm
443 OBJCOPY = $(CROSS_COMPILE)objcopy
444 OBJDUMP = $(CROSS_COMPILE)objdump
445 READELF = $(CROSS_COMPILE)readelf
446 STRIP = $(CROSS_COMPILE)strip
449 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
453 INSTALLKERNEL := installkernel
468 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
469 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
478 # Use USERINCLUDE when you must reference the UAPI directories only.
480 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
481 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
482 -I$(srctree)/include/uapi \
483 -I$(objtree)/include/generated/uapi \
484 -include $(srctree)/include/linux/kconfig.h
486 # Use LINUXINCLUDE when you must reference the include/ directory.
487 # Needed to be compatible with the O= option
489 -I$(srctree)/arch/$(SRCARCH)/include \
490 -I$(objtree)/arch/$(SRCARCH)/include/generated \
491 $(if $(building_out_of_srctree),-I$(srctree)/include) \
492 -I$(objtree)/include \
495 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
496 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
497 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
498 -Werror=implicit-function-declaration -Werror=implicit-int \
499 -Werror=return-type -Wno-format-security \
501 KBUILD_CPPFLAGS := -D__KERNEL__
502 KBUILD_AFLAGS_KERNEL :=
503 KBUILD_CFLAGS_KERNEL :=
504 KBUILD_AFLAGS_MODULE := -DMODULE
505 KBUILD_CFLAGS_MODULE := -DMODULE
506 KBUILD_LDFLAGS_MODULE :=
510 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
511 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
512 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
513 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
514 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
516 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
517 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
518 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
519 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
520 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
522 # Files to ignore in find ... statements
524 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
525 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
527 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
528 --exclude CVS --exclude .pc --exclude .hg --exclude .git
530 # ===========================================================================
531 # Rules shared between *config targets and build targets
533 # Basic helpers built in scripts/basic/
534 PHONY += scripts_basic
536 $(Q)$(MAKE) $(build)=scripts/basic
537 $(Q)rm -f .tmp_quiet_recordmcount
539 PHONY += outputmakefile
540 # Before starting out-of-tree build, make sure the source tree is clean.
541 # outputmakefile generates a Makefile in the output directory, if using a
542 # separate output directory. This allows convenient use of make in the
544 # At the same time when output Makefile generated, generate .gitignore to
545 # ignore whole output directory
547 ifdef building_out_of_srctree
548 $(Q)if [ -f $(srctree)/.config -o \
549 -d $(srctree)/include/config -o \
550 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
552 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
553 echo >&2 "*** in $(abs_srctree)";\
557 $(Q)ln -fsn $(srctree) source
558 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
559 $(Q)test -e .gitignore || \
560 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
563 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
564 ifneq ($(CROSS_COMPILE),)
565 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
566 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
567 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
568 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
570 ifneq ($(GCC_TOOLCHAIN),)
571 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
573 ifneq ($(LLVM_IAS),1)
574 CLANG_FLAGS += -no-integrated-as
576 CLANG_FLAGS += -Werror=unknown-warning-option
577 KBUILD_CFLAGS += $(CLANG_FLAGS)
578 KBUILD_AFLAGS += $(CLANG_FLAGS)
582 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
583 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
584 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
585 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
586 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
589 # ===========================================================================
590 # *config targets only - make sure prerequisites are updated, and descend
591 # in scripts/kconfig to make the *config target
593 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
594 # KBUILD_DEFCONFIG may point out an alternative default configuration
595 # used for 'make defconfig'
596 include arch/$(SRCARCH)/Makefile
597 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
599 config: outputmakefile scripts_basic FORCE
600 $(Q)$(MAKE) $(build)=scripts/kconfig $@
602 %config: outputmakefile scripts_basic FORCE
603 $(Q)$(MAKE) $(build)=scripts/kconfig $@
606 # ===========================================================================
607 # Build targets only - this includes vmlinux, arch specific targets, clean
608 # targets and others. In general all targets except *config targets.
610 # If building an external module we do not care about the all: rule
611 # but instead __all depend on modules
613 ifeq ($(KBUILD_EXTMOD),)
619 # Decide whether to build built-in, modular, or both.
620 # Normally, just do built-in.
625 # If we have only "make modules", don't compile built-in objects.
626 ifeq ($(MAKECMDGOALS),modules)
630 # If we have "make <whatever> modules", compile modules
631 # in addition to whatever we do anyway.
632 # Just "make" or "make all" shall build modules as well
634 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
638 ifeq ($(MAKECMDGOALS),)
642 export KBUILD_MODULES KBUILD_BUILTIN
645 include include/config/auto.conf
648 ifeq ($(KBUILD_EXTMOD),)
649 # Objects we will link into vmlinux / subdirs we need to visit
651 drivers-y := drivers/ sound/
652 drivers-$(CONFIG_SAMPLES) += samples/
653 drivers-y += net/ virt/
655 endif # KBUILD_EXTMOD
657 # The all: target is the default when no target is given on the
659 # This allow a user to issue only 'make' to build a kernel including modules
660 # Defaults to vmlinux, but the arch makefile usually adds further targets
663 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
664 $(call cc-option,-fno-tree-loop-im) \
665 $(call cc-disable-warning,maybe-uninitialized,)
668 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
669 ifdef CONFIG_FUNCTION_TRACER
670 CC_FLAGS_FTRACE := -pg
673 ifdef CONFIG_CC_IS_GCC
674 RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
675 RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch-cs-prefix)
676 RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register)
678 ifdef CONFIG_CC_IS_CLANG
679 RETPOLINE_CFLAGS := -mretpoline-external-thunk
680 RETPOLINE_VDSO_CFLAGS := -mretpoline
684 RETHUNK_CFLAGS := -mfunction-return=thunk-extern
685 RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS)
688 export RETPOLINE_CFLAGS
689 export RETPOLINE_VDSO_CFLAGS
691 include arch/$(SRCARCH)/Makefile
694 ifdef may-sync-config
695 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
696 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
697 # because some architectures define CROSS_COMPILE there.
698 include include/config/auto.conf.cmd
702 @echo >&2 '*** Configuration file "$@" not found!'
704 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
705 @echo >&2 '*** "make menuconfig" or "make xconfig").'
709 # The actual configuration files used during the build are stored in
710 # include/generated/ and include/config/. Update them if .config is newer than
711 # include/config/auto.conf (which mirrors .config).
713 # This exploits the 'multi-target pattern rule' trick.
714 # The syncconfig should be executed only once to make all the targets.
715 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
717 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
718 # so you cannot notice that Kconfig is waiting for the user input.
719 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
720 $(Q)$(kecho) " SYNC $@"
721 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
722 else # !may-sync-config
723 # External modules and some install targets need include/generated/autoconf.h
724 # and include/config/auto.conf but do not care if they are up-to-date.
725 # Use auto.conf to trigger the test
726 PHONY += include/config/auto.conf
728 include/config/auto.conf:
729 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
731 echo >&2 " ERROR: Kernel configuration is invalid."; \
732 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
733 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
737 endif # may-sync-config
740 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
741 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
742 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
743 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
744 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
746 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
748 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
750 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
754 # Tell gcc to never replace conditional load with a non-conditional one
755 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
756 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
758 ifdef CONFIG_READABLE_ASM
759 # Disable optimizations that make assembler listings hard to read.
760 # reorder blocks reorders the control in the function
761 # ipa clone creates specialized cloned functions
762 # partial inlining inlines only parts of functions
763 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
764 $(call cc-option,-fno-ipa-cp-clone,) \
765 $(call cc-option,-fno-partial-inlining)
768 ifneq ($(CONFIG_FRAME_WARN),0)
769 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
772 stackp-flags-y := -fno-stack-protector
773 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
774 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
776 KBUILD_CFLAGS += $(stackp-flags-y)
778 ifdef CONFIG_CC_IS_CLANG
779 KBUILD_CPPFLAGS += -Qunused-arguments
780 KBUILD_CFLAGS += -Wno-format-invalid-specifier
781 KBUILD_CFLAGS += -Wno-gnu
782 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
783 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
784 # See modpost pattern 2
785 KBUILD_CFLAGS += -mno-global-merge
788 # Warn about unmarked fall-throughs in switch statement.
789 # Disabled for clang while comment to attribute conversion happens and
790 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
791 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
794 # These warnings generated too much noise in a regular build.
795 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
796 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
798 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
799 ifdef CONFIG_FRAME_POINTER
800 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
802 # Some targets (ARM with Thumb2, for example), can't be built with frame
803 # pointers. For those, we don't have FUNCTION_TRACER automatically
804 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
805 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
806 # -fomit-frame-pointer with FUNCTION_TRACER.
807 ifndef CONFIG_FUNCTION_TRACER
808 KBUILD_CFLAGS += -fomit-frame-pointer
812 # Initialize all stack variables with a 0xAA pattern.
813 ifdef CONFIG_INIT_STACK_ALL_PATTERN
814 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
817 # Initialize all stack variables with a zero value.
818 ifdef CONFIG_INIT_STACK_ALL_ZERO
819 # Future support for zero initialization is still being debated, see
820 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
821 # renamed or dropped.
822 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
823 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
828 # Workaround for GCC versions < 5.0
829 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
830 ifdef CONFIG_CC_IS_GCC
831 DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
834 ifdef CONFIG_DEBUG_INFO
836 ifdef CONFIG_DEBUG_INFO_SPLIT
837 DEBUG_CFLAGS += -gsplit-dwarf
842 ifneq ($(LLVM_IAS),1)
843 KBUILD_AFLAGS += -Wa,-gdwarf-2
846 ifdef CONFIG_DEBUG_INFO_DWARF4
847 DEBUG_CFLAGS += -gdwarf-4
850 ifdef CONFIG_DEBUG_INFO_REDUCED
851 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
852 $(call cc-option,-fno-var-tracking)
855 ifdef CONFIG_DEBUG_INFO_COMPRESSED
856 DEBUG_CFLAGS += -gz=zlib
857 KBUILD_AFLAGS += -gz=zlib
858 KBUILD_LDFLAGS += --compress-debug-sections=zlib
861 endif # CONFIG_DEBUG_INFO
863 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
866 ifdef CONFIG_FUNCTION_TRACER
867 ifdef CONFIG_FTRACE_MCOUNT_RECORD
868 # gcc 5 supports generating the mcount tables directly
869 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
870 CC_FLAGS_FTRACE += -mrecord-mcount
871 export CC_USING_RECORD_MCOUNT := 1
873 ifdef CONFIG_HAVE_NOP_MCOUNT
874 ifeq ($(call cc-option-yn, -mnop-mcount),y)
875 CC_FLAGS_FTRACE += -mnop-mcount
876 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
880 ifdef CONFIG_HAVE_FENTRY
881 ifeq ($(call cc-option-yn, -mfentry),y)
882 CC_FLAGS_FTRACE += -mfentry
883 CC_FLAGS_USING += -DCC_USING_FENTRY
886 export CC_FLAGS_FTRACE
887 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
888 KBUILD_AFLAGS += $(CC_FLAGS_USING)
889 ifdef CONFIG_DYNAMIC_FTRACE
890 ifdef CONFIG_HAVE_C_RECORDMCOUNT
891 BUILD_C_RECORDMCOUNT := y
892 export BUILD_C_RECORDMCOUNT
897 # We trigger additional mismatches with less inlining
898 ifdef CONFIG_DEBUG_SECTION_MISMATCH
899 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
902 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
903 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
904 LDFLAGS_vmlinux += --gc-sections
907 ifdef CONFIG_SHADOW_CALL_STACK
908 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
909 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
913 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
914 KBUILD_CFLAGS += -falign-functions=32
917 # arch Makefile may override CC so keep this after arch Makefile is included
918 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
920 # warn about C99 declaration after statement
921 KBUILD_CFLAGS += -Wdeclaration-after-statement
923 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
924 KBUILD_CFLAGS += -Wvla
926 # disable pointer signed / unsigned warnings in gcc 4.0
927 KBUILD_CFLAGS += -Wno-pointer-sign
929 # disable stringop warnings in gcc 8+
930 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
932 # We'll want to enable this eventually, but it's not going away for 5.7 at least
933 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
934 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
935 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
937 # Another good warning that we'll want to enable eventually
938 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
940 # Enabled with W=2, disabled by default as noisy
941 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
943 # disable invalid "can't wrap" optimizations for signed / pointers
944 KBUILD_CFLAGS += -fno-strict-overflow
946 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
947 KBUILD_CFLAGS += -fno-stack-check
949 # conserve stack if available
950 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
952 # Prohibit date/time macros, which would make the build non-deterministic
953 KBUILD_CFLAGS += -Werror=date-time
955 # enforce correct pointer usage
956 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
958 # Require designated initializers for all marked structures
959 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
961 # change __FILE__ to the relative path from the srctree
962 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
964 # include additional Makefiles when needed
965 include-y := scripts/Makefile.extrawarn
966 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
967 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
968 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
969 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
970 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
972 include $(addprefix $(srctree)/, $(include-y))
974 # scripts/Makefile.gcc-plugins is intentionally included last.
975 # Do not add $(call cc-option,...) below this line. When you build the kernel
976 # from the clean source tree, the GCC plugins do not exist at this point.
978 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
979 KBUILD_CPPFLAGS += $(KCPPFLAGS)
980 KBUILD_AFLAGS += $(KAFLAGS)
981 KBUILD_CFLAGS += $(KCFLAGS)
983 KBUILD_LDFLAGS_MODULE += --build-id=sha1
984 LDFLAGS_vmlinux += --build-id=sha1
986 KBUILD_LDFLAGS += -z noexecstack
987 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
989 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
990 LDFLAGS_vmlinux += $(call ld-option, -X,)
993 ifeq ($(CONFIG_RELR),y)
994 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
997 # We never want expected sections to be placed heuristically by the
998 # linker. All sections should be explicitly named in the linker script.
999 ifdef CONFIG_LD_ORPHAN_WARN
1000 LDFLAGS_vmlinux += --orphan-handling=warn
1003 # Align the bit size of userspace programs with the kernel
1004 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1005 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1007 # make the checker run with the right architecture
1008 CHECKFLAGS += --arch=$(ARCH)
1010 # insure the checker run with the right endianness
1011 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1013 # the checker needs the correct machine size
1014 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1016 # Default kernel image to build when no specific target is given.
1017 # KBUILD_IMAGE may be overruled on the command line or
1018 # set in the environment
1019 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1020 # this default value
1021 export KBUILD_IMAGE ?= vmlinux
1024 # INSTALL_PATH specifies where to place the updated kernel and system map
1025 # images. Default is /boot, but you can set it to other values
1026 export INSTALL_PATH ?= /boot
1029 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1030 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1031 # an argument if needed. Otherwise it defaults to the kernel install path
1033 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1036 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1037 # relocations required by build roots. This is not defined in the
1038 # makefile but the argument can be passed to make if needed.
1041 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1045 # INSTALL_MOD_STRIP, if defined, will cause modules to be
1046 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1047 # the default option --strip-debug will be used. Otherwise,
1048 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1050 ifdef INSTALL_MOD_STRIP
1051 ifeq ($(INSTALL_MOD_STRIP),1)
1052 mod_strip_cmd = $(STRIP) --strip-debug
1054 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1055 endif # INSTALL_MOD_STRIP=1
1057 mod_strip_cmd = true
1058 endif # INSTALL_MOD_STRIP
1059 export mod_strip_cmd
1061 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1062 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1063 # or CONFIG_MODULE_COMPRESS_XZ.
1065 mod_compress_cmd = true
1066 ifdef CONFIG_MODULE_COMPRESS
1067 ifdef CONFIG_MODULE_COMPRESS_GZIP
1068 mod_compress_cmd = $(KGZIP) -n -f
1069 endif # CONFIG_MODULE_COMPRESS_GZIP
1070 ifdef CONFIG_MODULE_COMPRESS_XZ
1071 mod_compress_cmd = $(XZ) -f
1072 endif # CONFIG_MODULE_COMPRESS_XZ
1073 endif # CONFIG_MODULE_COMPRESS
1074 export mod_compress_cmd
1076 ifdef CONFIG_MODULE_SIG_ALL
1077 $(eval $(call config_filename,MODULE_SIG_KEY))
1079 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1085 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1087 has_libelf = $(call try-run,\
1088 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1090 ifdef CONFIG_STACK_VALIDATION
1091 ifeq ($(has_libelf),1)
1092 objtool_target := tools/objtool FORCE
1094 SKIP_STACK_VALIDATION := 1
1095 export SKIP_STACK_VALIDATION
1099 PHONY += resolve_btfids_clean
1101 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1103 # tools/bpf/resolve_btfids directory might not exist
1104 # in output directory, skip its clean in that case
1105 resolve_btfids_clean:
1106 ifneq ($(wildcard $(resolve_btfids_O)),)
1107 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1111 ifdef CONFIG_DEBUG_INFO_BTF
1112 ifeq ($(has_libelf),1)
1113 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1115 ERROR_RESOLVE_BTFIDS := 1
1117 endif # CONFIG_DEBUG_INFO_BTF
1122 export MODORDER := $(extmod-prefix)modules.order
1123 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1125 ifeq ($(KBUILD_EXTMOD),)
1126 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1128 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1129 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1130 $(libs-y) $(libs-m)))
1132 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1133 $(patsubst %/,%,$(filter %/, $(core-) \
1134 $(drivers-) $(libs-))))
1136 build-dirs := $(vmlinux-dirs)
1137 clean-dirs := $(vmlinux-alldirs)
1139 subdir-modorder := $(addsuffix /modules.order, $(build-dirs))
1141 # Externally visible symbols (used by link-vmlinux.sh)
1142 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1143 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1144 ifdef CONFIG_MODULES
1145 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1146 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1148 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1150 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1152 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1153 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1154 # used by scripts/Makefile.package
1155 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1157 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1159 # Recurse until adjust_autoksyms.sh is satisfied
1160 PHONY += autoksyms_recursive
1161 ifdef CONFIG_TRIM_UNUSED_KSYMS
1162 # For the kernel to actually contain only the needed exported symbols,
1163 # we have to build modules as well to determine what those symbols are.
1164 # (this can be evaluated only once include/config/auto.conf has been included)
1167 autoksyms_recursive: descend modules.order
1168 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1169 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1172 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1174 quiet_cmd_autoksyms_h = GEN $@
1175 cmd_autoksyms_h = mkdir -p $(dir $@); \
1176 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1179 $(call cmd,autoksyms_h)
1181 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1183 # Final link of vmlinux with optional arch pass after final link
1184 cmd_link-vmlinux = \
1185 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1186 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1188 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1189 +$(call if_changed,link-vmlinux)
1193 # The actual objects are generated when descending,
1194 # make sure no implicit rule kicks in
1195 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1197 filechk_kernel.release = \
1198 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1200 # Store (new) KERNELRELEASE string in include/config/kernel.release
1201 include/config/kernel.release: FORCE
1202 $(call filechk,kernel.release)
1204 # Additional helpers built in scripts/
1205 # Carefully list dependencies so we do not try to build scripts twice
1208 scripts: scripts_basic scripts_dtc
1209 $(Q)$(MAKE) $(build)=$(@)
1211 # Things we need to do before we recursively start building the kernel
1212 # or the modules are listed in "prepare".
1213 # A multi level approach is used. prepareN is processed before prepareN-1.
1214 # archprepare is used in arch Makefiles and when processed asm symlink,
1215 # version.h and scripts_basic is processed / created.
1217 PHONY += prepare archprepare
1219 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1220 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1221 include/generated/autoconf.h
1223 prepare0: archprepare
1224 $(Q)$(MAKE) $(build)=scripts/mod
1225 $(Q)$(MAKE) $(build)=.
1227 # All the preparing..
1228 prepare: prepare0 prepare-objtool prepare-resolve_btfids
1230 # Support for using generic headers in asm-generic
1231 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1233 PHONY += asm-generic uapi-asm-generic
1234 asm-generic: uapi-asm-generic
1235 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1236 generic=include/asm-generic
1238 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1239 generic=include/uapi/asm-generic
1241 PHONY += prepare-objtool prepare-resolve_btfids
1242 prepare-objtool: $(objtool_target)
1243 ifeq ($(SKIP_STACK_VALIDATION),1)
1244 ifdef CONFIG_UNWINDER_ORC
1245 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1248 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1252 prepare-resolve_btfids: $(resolve_btfids_target)
1253 ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1254 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1257 # Generate some files
1258 # ---------------------------------------------------------------------------
1260 # KERNELRELEASE can change from a few different places, meaning version.h
1261 # needs to be updated, so this check is forced on all builds
1264 define filechk_utsrelease.h
1265 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1266 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1269 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1272 define filechk_version.h
1273 if [ $(SUBLEVEL) -gt 255 ]; then \
1274 echo \#define LINUX_VERSION_CODE $(shell \
1275 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1277 echo \#define LINUX_VERSION_CODE $(shell \
1278 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1280 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1281 ((c) > 255 ? 255 : (c)))'
1284 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1285 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1287 $(call filechk,version.h)
1288 $(Q)rm -f $(old_version_h)
1290 include/generated/utsrelease.h: include/config/kernel.release FORCE
1291 $(call filechk,utsrelease.h)
1295 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1296 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1298 # ---------------------------------------------------------------------------
1301 #Default location for installed headers
1302 export INSTALL_HDR_PATH = $(objtree)/usr
1304 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1305 cmd_headers_install = \
1306 mkdir -p $(INSTALL_HDR_PATH); \
1307 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1308 usr/include $(INSTALL_HDR_PATH)
1310 PHONY += headers_install
1311 headers_install: headers
1312 $(call cmd,headers_install)
1314 PHONY += archheaders archscripts
1316 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1319 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1320 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1321 $(error Headers not exportable for the $(SRCARCH) architecture))
1322 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1323 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1325 # Deprecated. It is no-op now.
1326 PHONY += headers_check
1330 ifdef CONFIG_HEADERS_INSTALL
1334 PHONY += scripts_unifdef
1335 scripts_unifdef: scripts_basic
1336 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1338 # ---------------------------------------------------------------------------
1343 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1346 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1348 PHONY += kselftest-merge
1350 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1351 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1352 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1353 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1355 # ---------------------------------------------------------------------------
1358 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1359 dtstree := arch/$(SRCARCH)/boot/dts
1364 %.dtb: include/config/kernel.release scripts_dtc
1365 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1367 PHONY += dtbs dtbs_install dtbs_check
1368 dtbs: include/config/kernel.release scripts_dtc
1369 $(Q)$(MAKE) $(build)=$(dtstree)
1371 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1373 dtbs: dt_binding_check
1379 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1381 ifdef CONFIG_OF_EARLY_FLATTREE
1387 PHONY += scripts_dtc
1388 scripts_dtc: scripts_basic
1389 $(Q)$(MAKE) $(build)=scripts/dtc
1391 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1392 export CHECK_DT_BINDING=y
1395 PHONY += dt_binding_check
1396 dt_binding_check: scripts_dtc
1397 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1399 # ---------------------------------------------------------------------------
1402 ifdef CONFIG_MODULES
1404 # By default, build modules as well
1408 # When we're building modules with modversions, we need to consider
1409 # the built-in objects during the descend as well, in order to
1410 # make sure the checksums are up to date before we record them.
1411 ifdef CONFIG_MODVERSIONS
1417 # A module can be listed more than once in obj-m resulting in
1418 # duplicate lines in modules.order files. Those are removed
1419 # using awk while concatenating to the final file.
1422 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1423 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1425 PHONY += modules_check
1426 modules_check: modules.order
1427 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1429 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1431 modules.order: $(subdir-modorder) FORCE
1432 $(call if_changed,modules_order)
1434 targets += modules.order
1436 # Target to prepare building external modules
1437 PHONY += modules_prepare
1438 modules_prepare: prepare
1439 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1441 # Target to install modules
1442 PHONY += modules_install
1443 modules_install: _modinst_ _modinst_post
1447 @rm -rf $(MODLIB)/kernel
1448 @rm -f $(MODLIB)/source
1449 @mkdir -p $(MODLIB)/kernel
1450 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1451 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1452 rm -f $(MODLIB)/build ; \
1453 ln -s $(CURDIR) $(MODLIB)/build ; \
1455 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1456 @cp -f modules.builtin $(MODLIB)/
1457 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1458 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1460 # This depmod is only for convenience to give the initial
1461 # boot a modules.dep even before / is mounted read-write. However the
1462 # boot script depmod is the master version.
1463 PHONY += _modinst_post
1464 _modinst_post: _modinst_
1467 ifeq ($(CONFIG_MODULE_SIG), y)
1468 PHONY += modules_sign
1470 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1473 else # CONFIG_MODULES
1475 # Modules not configured
1476 # ---------------------------------------------------------------------------
1478 PHONY += modules modules_install
1479 modules modules_install:
1481 @echo >&2 "The present kernel configuration has modules disabled."
1482 @echo >&2 "Type 'make config' and enable loadable module support."
1483 @echo >&2 "Then build a kernel with module support enabled."
1487 endif # CONFIG_MODULES
1490 # Cleaning is done on three levels.
1491 # make clean Delete most generated files
1492 # Leave enough to build external modules
1493 # make mrproper Delete the current configuration, and all generated files
1494 # make distclean Remove editor backup files, patch leftover files and the like
1496 # Directories & files removed with 'make clean'
1497 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1498 modules.builtin modules.builtin.modinfo modules.nsdeps \
1499 compile_commands.json
1501 # Directories & files removed with 'make mrproper'
1502 MRPROPER_FILES += include/config include/generated \
1503 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1504 debian snap tar-install \
1505 .config .config.old .version \
1507 signing_key.pem signing_key.priv signing_key.x509 \
1508 x509.genkey extra_certificates signing_key.x509.keyid \
1509 signing_key.x509.signer vmlinux-gdb.py \
1512 # Directories & files removed with 'make distclean'
1513 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1515 # clean - Delete most, but leave enough to build external modules
1517 clean: rm-files := $(CLEAN_FILES)
1519 PHONY += archclean vmlinuxclean
1522 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1523 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1525 clean: archclean vmlinuxclean resolve_btfids_clean
1527 # mrproper - Delete all generated files, including .config
1529 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1530 mrproper-dirs := $(addprefix _mrproper_,scripts)
1532 PHONY += $(mrproper-dirs) mrproper
1534 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1536 mrproper: clean $(mrproper-dirs)
1541 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1547 @find $(srctree) $(RCS_FIND_IGNORE) \
1548 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1549 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1550 -o -name 'core' \) \
1551 -type f -print | xargs rm -f
1554 # Packaging of the kernel to various formats
1555 # ---------------------------------------------------------------------------
1558 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1559 %pkg: include/config/kernel.release FORCE
1560 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1562 # Brief documentation of the typical targets used
1563 # ---------------------------------------------------------------------------
1565 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1566 boards := $(sort $(notdir $(boards)))
1567 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1568 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1572 @echo 'Cleaning targets:'
1573 @echo ' clean - Remove most generated files but keep the config and'
1574 @echo ' enough build support to build external modules'
1575 @echo ' mrproper - Remove all generated files + config + various backup files'
1576 @echo ' distclean - mrproper + remove editor backup and patch files'
1578 @echo 'Configuration targets:'
1579 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1581 @echo 'Other generic targets:'
1582 @echo ' all - Build all targets marked with [*]'
1583 @echo '* vmlinux - Build the bare kernel'
1584 @echo '* modules - Build all modules'
1585 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1586 @echo ' dir/ - Build all files in dir and below'
1587 @echo ' dir/file.[ois] - Build specified target only'
1588 @echo ' dir/file.ll - Build the LLVM assembly file'
1589 @echo ' (requires compiler support for LLVM assembly generation)'
1590 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1591 @echo ' (requires a recent binutils and recent build (System.map))'
1592 @echo ' dir/file.ko - Build module including final link'
1593 @echo ' modules_prepare - Set up for building external modules'
1594 @echo ' tags/TAGS - Generate tags file for editors'
1595 @echo ' cscope - Generate cscope index'
1596 @echo ' gtags - Generate GNU GLOBAL index'
1597 @echo ' kernelrelease - Output the release version string (use with make -s)'
1598 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1599 @echo ' image_name - Output the image name (use with make -s)'
1600 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1601 echo ' (default: $(INSTALL_HDR_PATH))'; \
1603 @echo 'Static analysers:'
1604 @echo ' checkstack - Generate a list of stack hogs'
1605 @echo ' versioncheck - Sanity check on version.h usage'
1606 @echo ' includecheck - Check for duplicate included header files'
1607 @echo ' export_report - List the usages of all exported symbols'
1608 @echo ' headerdep - Detect inclusion cycles in headers'
1609 @echo ' coccicheck - Check with Coccinelle'
1610 @echo ' clang-analyzer - Check with clang static analyzer'
1611 @echo ' clang-tidy - Check with clang-tidy'
1614 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1616 @echo 'Kernel selftest:'
1617 @echo ' kselftest - Build and run kernel selftest'
1618 @echo ' Build, install, and boot kernel before'
1619 @echo ' running kselftest on it'
1620 @echo ' Run as root for full coverage'
1621 @echo ' kselftest-all - Build kernel selftest'
1622 @echo ' kselftest-install - Build and install kernel selftest'
1623 @echo ' kselftest-clean - Remove all generated kselftest files'
1624 @echo ' kselftest-merge - Merge all the config dependencies of'
1625 @echo ' kselftest to existing .config.'
1628 echo 'Devicetree:'; \
1629 echo '* dtbs - Build device tree blobs for enabled boards'; \
1630 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1631 echo ' dt_binding_check - Validate device tree binding documents'; \
1632 echo ' dtbs_check - Validate device tree source files';\
1635 @echo 'Userspace tools targets:'
1636 @echo ' use "make tools/help"'
1637 @echo ' or "cd tools; make help"'
1639 @echo 'Kernel packaging:'
1640 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1642 @echo 'Documentation targets:'
1643 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1645 @echo 'Architecture specific targets ($(SRCARCH)):'
1646 @$(if $(archhelp),$(archhelp),\
1647 echo ' No architecture specific help defined for $(SRCARCH)')
1650 $(foreach b, $(boards), \
1651 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1653 @$(if $(board-dirs), \
1654 $(foreach b, $(board-dirs), \
1655 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1656 printf " %-16s - Show all of the above\\n" help-boards; \
1659 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1660 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1661 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1662 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1663 @echo ' (sparse by default)'
1664 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1665 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1666 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1667 @echo ' 1: warnings which may be relevant and do not occur too often'
1668 @echo ' 2: warnings which occur quite often but may still be relevant'
1669 @echo ' 3: more obscure warnings, can most likely be ignored'
1670 @echo ' Multiple levels can be combined with W=12 or W=123'
1672 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1673 @echo 'For further info see the ./README file'
1676 help-board-dirs := $(addprefix help-,$(board-dirs))
1678 help-boards: $(help-board-dirs)
1680 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1682 $(help-board-dirs): help-%:
1683 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1684 @$(if $(boards-per-dir), \
1685 $(foreach b, $(boards-per-dir), \
1686 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1690 # Documentation targets
1691 # ---------------------------------------------------------------------------
1692 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1693 linkcheckdocs dochelp refcheckdocs
1694 PHONY += $(DOC_TARGETS)
1696 $(Q)$(MAKE) $(build)=Documentation $@
1699 # ---------------------------------------------------------------------------
1701 PHONY += scripts_gdb
1702 scripts_gdb: prepare0
1703 $(Q)$(MAKE) $(build)=scripts/gdb
1704 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1706 ifdef CONFIG_GDB_SCRIPTS
1710 else # KBUILD_EXTMOD
1713 # External module support.
1714 # When building external modules the kernel used as basis is considered
1715 # read-only, and no consistency checks are made and the make
1716 # system is not used on the basis kernel. If updates are required
1717 # in the basis kernel ordinary make commands (without M=...) must
1720 # The following are the only valid targets when building external
1722 # make M=dir clean Delete all automatically generated files
1723 # make M=dir modules Make all modules in specified dir
1724 # make M=dir Same as 'make M=dir modules'
1725 # make M=dir modules_install
1726 # Install the modules built in the module directory
1727 # Assumes install directory is already created
1729 # We are always building only modules.
1733 build-dirs := $(KBUILD_EXTMOD)
1735 modules: $(MODORDER)
1736 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1738 $(MODORDER): descend
1741 PHONY += modules_install
1742 modules_install: _emodinst_ _emodinst_post
1744 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1747 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1748 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1750 PHONY += _emodinst_post
1751 _emodinst_post: _emodinst_
1754 compile_commands.json: $(extmod-prefix)compile_commands.json
1755 PHONY += compile_commands.json
1757 clean-dirs := $(KBUILD_EXTMOD)
1758 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1759 $(KBUILD_EXTMOD)/compile_commands.json
1763 @echo ' Building external modules.'
1764 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1766 @echo ' modules - default target, build the module(s)'
1767 @echo ' modules_install - install the module'
1768 @echo ' clean - remove generated files in module directory only'
1771 # no-op for external module builds
1772 PHONY += prepare modules_prepare
1774 endif # KBUILD_EXTMOD
1777 # ---------------------------------------------------------------------------
1778 # To build individual files in subdirectories, you can do like this:
1780 # make foo/bar/baz.s
1782 # The supported suffixes for single-target are listed in 'single-targets'
1784 # To build only under specific subdirectories, you can do like this:
1790 # .ko is special because modpost is needed
1791 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1792 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1794 $(single-ko): single_modpost
1796 $(single-no-ko): descend
1799 ifeq ($(KBUILD_EXTMOD),)
1800 # For the single build of in-tree modules, use a temporary file to avoid
1801 # the situation of modules_install installing an invalid modules.order.
1802 MODORDER := .modules.tmp
1805 PHONY += single_modpost
1806 single_modpost: $(single-no-ko) modules_prepare
1807 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1808 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1812 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1814 # trim unrelated directories
1815 build-dirs := $(foreach d, $(build-dirs), \
1816 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1820 ifndef CONFIG_MODULES
1824 # Handle descending into subdirectories listed in $(build-dirs)
1825 # Preset locale variables to speed up the build process. Limit locale
1826 # tweaks to this spot to avoid wrong language settings when running
1827 # make menuconfig etc.
1828 # Error messages still appears in the original language
1829 PHONY += descend $(build-dirs)
1830 descend: $(build-dirs)
1831 $(build-dirs): prepare
1832 $(Q)$(MAKE) $(build)=$@ \
1833 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1834 need-builtin=1 need-modorder=1
1836 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1837 PHONY += $(clean-dirs) clean
1839 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1841 clean: $(clean-dirs)
1843 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1844 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1846 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1847 -o -name '*.dwo' -o -name '*.lst' \
1848 -o -name '*.su' -o -name '*.mod' \
1849 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1850 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1851 -o -name '*.asn1.[ch]' \
1852 -o -name '*.symtypes' -o -name 'modules.order' \
1853 -o -name '.tmp_*.o.*' \
1854 -o -name '*.c.[012]*.*' \
1856 -o -name '*.gcno' \) -type f -print | xargs rm -f
1858 # Generate tags for editors
1859 # ---------------------------------------------------------------------------
1860 quiet_cmd_tags = GEN $@
1861 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1863 tags TAGS cscope gtags: FORCE
1866 # Script to generate missing namespace dependencies
1867 # ---------------------------------------------------------------------------
1870 nsdeps: export KBUILD_NSDEPS=1
1872 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1875 # ---------------------------------------------------------------------------
1877 quiet_cmd_gen_compile_commands = GEN $@
1878 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1880 $(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1881 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1882 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1883 $(call if_changed,gen_compile_commands)
1885 targets += $(extmod-prefix)compile_commands.json
1887 PHONY += clang-tidy clang-analyzer
1889 ifdef CONFIG_CC_IS_CLANG
1890 quiet_cmd_clang_tools = CHECK $<
1891 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1893 clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
1894 $(call cmd,clang_tools)
1896 clang-tidy clang-analyzer:
1897 @echo "$@ requires CC=clang" >&2
1901 # Scripts to check various things for consistency
1902 # ---------------------------------------------------------------------------
1904 PHONY += includecheck versioncheck coccicheck export_report
1907 find $(srctree)/* $(RCS_FIND_IGNORE) \
1908 -name '*.[hcS]' -type f -print | sort \
1909 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1912 find $(srctree)/* $(RCS_FIND_IGNORE) \
1913 -name '*.[hcS]' -type f -print | sort \
1914 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1917 $(Q)$(BASH) $(srctree)/scripts/$@
1920 $(PERL) $(srctree)/scripts/export_report.pl
1922 PHONY += checkstack kernelrelease kernelversion image_name
1924 # UML needs a little special treatment here. It wants to use the host
1925 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1926 # else wants $(ARCH), including people doing cross-builds, which means
1927 # that $(SUBARCH) doesn't work here.
1929 CHECKSTACK_ARCH := $(SUBARCH)
1931 CHECKSTACK_ARCH := $(ARCH)
1934 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1935 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1938 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1941 @echo $(KERNELVERSION)
1944 @echo $(KBUILD_IMAGE)
1946 # Clear a bunch of variables before executing the submake
1948 ifeq ($(quiet),silent_)
1953 $(Q)mkdir -p $(objtree)/tools
1954 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1957 $(Q)mkdir -p $(objtree)/tools
1958 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1960 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1961 cmd_rmfiles = rm -rf $(rm-files)
1963 # Run depmod only if we have System.map and depmod is executable
1964 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1965 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1968 # read saved command lines for existing targets
1969 existing-targets := $(wildcard $(sort $(targets)))
1971 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1973 endif # config-build
1975 endif # need-sub-make
1980 # Declare the contents of the PHONY variable as phony. We keep that
1981 # information in a variable so we can use it in if_changed and friends.