1 # SPDX-License-Identifier: GPL-2.0
6 NAME = Hurr durr I'ma ninja sloth
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 ifeq ($(filter undefine,$(.FEATURES)),)
15 $(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION))
18 $(if $(filter __%, $(MAKECMDGOALS)), \
19 $(error targets prefixed with '__' are only for internal use))
21 # That's our default target when none is given on the command line
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.a targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 this-makefile := $(lastword $(MAKEFILE_LIST))
42 export abs_srctree := $(realpath $(dir $(this-makefile)))
43 export abs_objtree := $(CURDIR)
45 ifneq ($(sub_make_done),1)
47 # Do not use make's built-in rules and variables
48 # (this increases performance and avoids hard-to-debug behaviour)
51 # Avoid funny character set dependencies
55 export LC_COLLATE LC_NUMERIC
57 # Avoid interference with shell env settings
61 # ---------------------------------------------------------------------------
63 # Most of build commands in Kbuild start with "cmd_". You can optionally define
64 # "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
65 # that command is printed by default.
68 # quiet_cmd_depmod = DEPMOD $(MODLIB)
69 # cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
71 # A simple variant is to prefix commands with $(Q) - that's useful
72 # for commands that shall be hidden in non-verbose mode.
74 # $(Q)$(MAKE) $(build)=scripts/basic
76 # If KBUILD_VERBOSE contains 1, the whole command is echoed.
77 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
79 # To put more focus on warnings, be less verbose as default
80 # Use 'make V=1' to see the full commands
82 ifeq ("$(origin V)", "command line")
89 ifneq ($(findstring 1, $(KBUILD_VERBOSE)),)
94 # If the user is running make -s (silent mode), suppress echoing of
96 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
98 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
99 short-opts := $(firstword -$(MAKEFLAGS))
101 short-opts := $(filter-out --%,$(MAKEFLAGS))
104 ifneq ($(findstring s,$(short-opts)),)
106 override KBUILD_VERBOSE :=
109 export quiet Q KBUILD_VERBOSE
111 # Call a source code checker (by default, "sparse") as part of the
114 # Use 'make C=1' to enable checking of only re-compiled files.
115 # Use 'make C=2' to enable checking of *all* source files, regardless
116 # of whether they are re-compiled or not.
118 # See the file "Documentation/dev-tools/sparse.rst" for more details,
119 # including where to get the "sparse" utility.
121 ifeq ("$(origin C)", "command line")
122 KBUILD_CHECKSRC = $(C)
124 ifndef KBUILD_CHECKSRC
128 export KBUILD_CHECKSRC
130 # Enable "clippy" (a linter) as part of the Rust compilation.
132 # Use 'make CLIPPY=1' to enable it.
133 ifeq ("$(origin CLIPPY)", "command line")
134 KBUILD_CLIPPY := $(CLIPPY)
139 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
140 # directory of external module to build. Setting M= takes precedence.
141 ifeq ("$(origin M)", "command line")
142 KBUILD_EXTMOD := $(M)
145 $(if $(word 2, $(KBUILD_EXTMOD)), \
146 $(error building multiple external modules is not supported))
148 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
149 $(error module directory path cannot contain '$x')))
151 # Remove trailing slashes
152 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
153 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
158 # backward compatibility
159 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)
161 ifeq ("$(origin W)", "command line")
162 KBUILD_EXTRA_WARN := $(W)
165 export KBUILD_EXTRA_WARN
167 # Kbuild will save output files in the current working directory.
168 # This does not need to match to the root of the kernel source tree.
170 # For example, you can do this:
172 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
174 # If you want to save output files in a different location, there are
175 # two syntaxes to specify it.
178 # Use "make O=dir/to/store/output/files/"
180 # 2) Set KBUILD_OUTPUT
181 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
182 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
184 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
187 # Do we want to change the working directory?
188 ifeq ("$(origin O)", "command line")
189 KBUILD_OUTPUT := $(O)
192 ifneq ($(KBUILD_OUTPUT),)
193 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
194 # expand a shell special character '~'. We use a somewhat tedious way here.
195 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
196 $(if $(abs_objtree),, \
197 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
199 # $(realpath ...) resolves symlinks
200 abs_objtree := $(realpath $(abs_objtree))
201 endif # ifneq ($(KBUILD_OUTPUT),)
203 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
204 $(error source directory cannot contain spaces or colons)
207 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
208 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
209 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
211 # Cancel implicit rules for this Makefile.
215 export sub_make_done := 1
217 endif # sub_make_done
219 ifeq ($(abs_objtree),$(CURDIR))
220 # Suppress "Entering directory ..." if we are at the final work directory.
221 no-print-directory := --no-print-directory
223 # Recursion to show "Entering directory ..."
227 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
228 # If --no-print-directory is unset, recurse once again to set it.
229 # You may end up recursing into __sub-make twice. This is needed due to the
230 # behavior change in GNU Make 4.4.1.
234 ifeq ($(need-sub-make),1)
236 PHONY += $(MAKECMDGOALS) __sub-make
238 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
241 # Invoke a second make in the output directory, passing relevant variables
243 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
244 -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
248 # We process the rest of the Makefile if this is the final invocation of make
250 ifeq ($(abs_srctree),$(abs_objtree))
251 # building in the source tree
253 building_out_of_srctree :=
255 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
256 # building in a subdirectory of the source tree
259 srctree := $(abs_srctree)
261 building_out_of_srctree := 1
264 ifneq ($(KBUILD_ABS_SRCTREE),)
265 srctree := $(abs_srctree)
271 export building_out_of_srctree srctree objtree VPATH
273 # To make sure we do not include .config for any of the *config targets
274 # catch them early, and hand them over to scripts/kconfig/Makefile
275 # It is allowed to specify more targets when calling make, including
276 # mixing *config targets and build targets.
277 # For example 'make oldconfig all'.
278 # Detect when mixed targets is specified, and make a second invocation
279 # of make so .config is not included in this case either (for *config).
281 version_h := include/generated/uapi/linux/version.h
283 clean-targets := %clean mrproper cleandocs
284 no-dot-config-targets := $(clean-targets) \
285 cscope gtags TAGS tags help% %docs check% coccicheck \
286 $(version_h) headers headers_% archheaders archscripts \
287 %asm-generic kernelversion %src-pkg dt_binding_check \
288 outputmakefile rustavailable rustfmt rustfmtcheck
289 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
291 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
299 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
300 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
305 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
306 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
311 need-compiler := $(may-sync-config)
313 ifneq ($(KBUILD_EXTMOD),)
317 ifeq ($(KBUILD_EXTMOD),)
318 ifneq ($(filter %config,$(MAKECMDGOALS)),)
320 ifneq ($(words $(MAKECMDGOALS)),1)
326 # We cannot build single targets and the others at the same time
327 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
329 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
334 # For "make -j clean all", "make -j mrproper defconfig all", etc.
335 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
336 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
341 # install and modules_install need also be processed one by one
342 ifneq ($(filter install,$(MAKECMDGOALS)),)
343 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
349 # ===========================================================================
350 # We're called with mixed targets (*config and build targets).
351 # Handle them one by one.
353 PHONY += $(MAKECMDGOALS) __build_one_by_one
355 $(MAKECMDGOALS): __build_one_by_one
360 for i in $(MAKECMDGOALS); do \
361 $(MAKE) -f $(srctree)/Makefile $$i; \
366 include $(srctree)/scripts/Kbuild.include
368 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
369 KERNELRELEASE = $(call read-file, include/config/kernel.release)
370 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
371 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
373 include $(srctree)/scripts/subarch.include
375 # Cross compiling and selecting different set of gcc/bin-utils
376 # ---------------------------------------------------------------------------
378 # When performing cross compilation for other architectures ARCH shall be set
379 # to the target architecture. (See arch/* for the possibilities).
380 # ARCH can be set during invocation of make:
382 # Another way is to have ARCH set in the environment.
383 # The default ARCH is the host where make is executed.
385 # CROSS_COMPILE specify the prefix used for all executables used
386 # during compilation. Only gcc and related bin-utils executables
387 # are prefixed with $(CROSS_COMPILE).
388 # CROSS_COMPILE can be set on the command line
389 # make CROSS_COMPILE=aarch64-linux-gnu-
390 # Alternatively CROSS_COMPILE can be set in the environment.
391 # Default value for CROSS_COMPILE is not to prefix executables
392 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
395 # Architecture as present in compile.h
396 UTS_MACHINE := $(ARCH)
399 # Additional ARCH settings for x86
403 ifeq ($(ARCH),x86_64)
407 # Additional ARCH settings for sparc
408 ifeq ($(ARCH),sparc32)
411 ifeq ($(ARCH),sparc64)
415 # Additional ARCH settings for parisc
416 ifeq ($(ARCH),parisc64)
420 export cross_compiling :=
421 ifneq ($(SRCARCH),$(SUBARCH))
425 KCONFIG_CONFIG ?= .config
426 export KCONFIG_CONFIG
428 # SHELL used by kbuild
431 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
432 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
433 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
436 ifneq ($(filter %/,$(LLVM)),)
437 LLVM_PREFIX := $(LLVM)
438 else ifneq ($(filter -%,$(LLVM)),)
439 LLVM_SUFFIX := $(LLVM)
442 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
443 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
449 HOSTPKG_CONFIG = pkg-config
451 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
452 -O2 -fomit-frame-pointer -std=gnu11
453 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
454 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
456 # These flags apply to all Rust code in the tree, including the kernel and
458 export rust_common_flags := --edition=2021 \
459 -Zbinary_dep_depinfo=y \
460 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
461 -Dunreachable_pub -Dnon_ascii_idents \
463 -Drustdoc::missing_crate_level_docs \
464 -Dclippy::correctness -Dclippy::style \
465 -Dclippy::suspicious -Dclippy::complexity \
467 -Dclippy::let_unit_value -Dclippy::mut_mut \
468 -Dclippy::needless_bitwise_bool \
469 -Dclippy::needless_continue \
470 -Dclippy::no_mangle_with_rust_abi \
473 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
474 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
475 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
476 -Zallow-features= $(HOSTRUSTFLAGS)
477 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
478 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
480 # Make variables (CC, etc...)
483 CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
484 LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
485 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
486 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
487 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
488 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
489 READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
490 STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
492 CC = $(CROSS_COMPILE)gcc
493 LD = $(CROSS_COMPILE)ld
494 AR = $(CROSS_COMPILE)ar
495 NM = $(CROSS_COMPILE)nm
496 OBJCOPY = $(CROSS_COMPILE)objcopy
497 OBJDUMP = $(CROSS_COMPILE)objdump
498 READELF = $(CROSS_COMPILE)readelf
499 STRIP = $(CROSS_COMPILE)strip
504 CLIPPY_DRIVER = clippy-driver
508 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
512 INSTALLKERNEL := installkernel
525 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
526 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
537 # Use USERINCLUDE when you must reference the UAPI directories only.
539 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
540 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
541 -I$(srctree)/include/uapi \
542 -I$(objtree)/include/generated/uapi \
543 -include $(srctree)/include/linux/compiler-version.h \
544 -include $(srctree)/include/linux/kconfig.h
546 # Use LINUXINCLUDE when you must reference the include/ directory.
547 # Needed to be compatible with the O= option
549 -I$(srctree)/arch/$(SRCARCH)/include \
550 -I$(objtree)/arch/$(SRCARCH)/include/generated \
551 $(if $(building_out_of_srctree),-I$(srctree)/include) \
552 -I$(objtree)/include \
555 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
558 KBUILD_CFLAGS += -std=gnu11
559 KBUILD_CFLAGS += -fshort-wchar
560 KBUILD_CFLAGS += -funsigned-char
561 KBUILD_CFLAGS += -fno-common
562 KBUILD_CFLAGS += -fno-PIE
563 KBUILD_CFLAGS += -fno-strict-aliasing
565 KBUILD_CPPFLAGS := -D__KERNEL__
566 KBUILD_RUSTFLAGS := $(rust_common_flags) \
567 --target=$(objtree)/scripts/target.json \
568 -Cpanic=abort -Cembed-bitcode=n -Clto=n \
569 -Cforce-unwind-tables=n -Ccodegen-units=1 \
570 -Csymbol-mangling-version=v0 \
571 -Crelocation-model=static \
572 -Zfunction-sections=n \
573 -Dclippy::float_arithmetic
575 KBUILD_AFLAGS_KERNEL :=
576 KBUILD_CFLAGS_KERNEL :=
577 KBUILD_RUSTFLAGS_KERNEL :=
578 KBUILD_AFLAGS_MODULE := -DMODULE
579 KBUILD_CFLAGS_MODULE := -DMODULE
580 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
581 KBUILD_LDFLAGS_MODULE :=
585 ifeq ($(KBUILD_CLIPPY),1)
586 RUSTC_OR_CLIPPY_QUIET := CLIPPY
587 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
589 RUSTC_OR_CLIPPY_QUIET := RUSTC
590 RUSTC_OR_CLIPPY = $(RUSTC)
597 # Allows the usage of unstable features in stable compilers.
598 export RUSTC_BOOTSTRAP := 1
600 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
601 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
602 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
603 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
604 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
605 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
606 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
607 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
609 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
610 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
611 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
612 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
613 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
614 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
616 # Files to ignore in find ... statements
618 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
619 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
622 # ===========================================================================
623 # Rules shared between *config targets and build targets
625 # Basic helpers built in scripts/basic/
626 PHONY += scripts_basic
628 $(Q)$(MAKE) $(build)=scripts/basic
630 PHONY += outputmakefile
631 ifdef building_out_of_srctree
632 # Before starting out-of-tree build, make sure the source tree is clean.
633 # outputmakefile generates a Makefile in the output directory, if using a
634 # separate output directory. This allows convenient use of make in the
636 # At the same time when output Makefile generated, generate .gitignore to
637 # ignore whole output directory
639 quiet_cmd_makefile = GEN Makefile
641 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
642 echo "include $(srctree)/Makefile"; \
646 @if [ -f $(srctree)/.config -o \
647 -d $(srctree)/include/config -o \
648 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
650 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
651 echo >&2 "*** in $(abs_srctree)";\
655 $(Q)ln -fsn $(srctree) source
657 $(Q)test -e .gitignore || \
658 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
661 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
662 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
663 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
664 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
665 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
667 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
668 include $(srctree)/scripts/Makefile.clang
671 # Include this also for config targets because some architectures need
672 # cc-cross-prefix to determine CROSS_COMPILE.
674 include $(srctree)/scripts/Makefile.compiler
678 # ===========================================================================
679 # *config targets only - make sure prerequisites are updated, and descend
680 # in scripts/kconfig to make the *config target
682 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
683 # KBUILD_DEFCONFIG may point out an alternative default configuration
684 # used for 'make defconfig'
685 include $(srctree)/arch/$(SRCARCH)/Makefile
686 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
688 config: outputmakefile scripts_basic FORCE
689 $(Q)$(MAKE) $(build)=scripts/kconfig $@
691 %config: outputmakefile scripts_basic FORCE
692 $(Q)$(MAKE) $(build)=scripts/kconfig $@
695 # ===========================================================================
696 # Build targets only - this includes vmlinux, arch-specific targets, clean
697 # targets and others. In general all targets except *config targets.
699 # If building an external module we do not care about the all: rule
700 # but instead __all depend on modules
702 ifeq ($(KBUILD_EXTMOD),)
710 # Decide whether to build built-in, modular, or both.
711 # Normally, just do built-in.
716 # If we have only "make modules", don't compile built-in objects.
717 ifeq ($(MAKECMDGOALS),modules)
721 # If we have "make <whatever> modules", compile modules
722 # in addition to whatever we do anyway.
723 # Just "make" or "make all" shall build modules as well
725 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
729 ifeq ($(MAKECMDGOALS),)
733 export KBUILD_MODULES KBUILD_BUILTIN
736 include include/config/auto.conf
739 ifeq ($(KBUILD_EXTMOD),)
740 # Objects we will link into vmlinux / subdirs we need to visit
744 endif # KBUILD_EXTMOD
746 # The all: target is the default when no target is given on the
748 # This allow a user to issue only 'make' to build a kernel including modules
749 # Defaults to vmlinux, but the arch makefile usually adds further targets
752 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
753 ifdef CONFIG_CC_IS_GCC
754 CFLAGS_GCOV += -fno-tree-loop-im
758 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
759 ifdef CONFIG_FUNCTION_TRACER
760 CC_FLAGS_FTRACE := -pg
763 include $(srctree)/arch/$(SRCARCH)/Makefile
766 ifdef may-sync-config
767 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
768 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
769 # because some architectures define CROSS_COMPILE there.
770 include include/config/auto.conf.cmd
774 @echo >&2 '*** Configuration file "$@" not found!'
776 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
777 @echo >&2 '*** "make menuconfig" or "make xconfig").'
781 # The actual configuration files used during the build are stored in
782 # include/generated/ and include/config/. Update them if .config is newer than
783 # include/config/auto.conf (which mirrors .config).
785 # This exploits the 'multi-target pattern rule' trick.
786 # The syncconfig should be executed only once to make all the targets.
787 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
789 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
790 # so you cannot notice that Kconfig is waiting for the user input.
791 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
792 $(Q)$(kecho) " SYNC $@"
793 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
794 else # !may-sync-config
795 # External modules and some install targets need include/generated/autoconf.h
796 # and include/config/auto.conf but do not care if they are up-to-date.
797 # Use auto.conf to trigger the test
798 PHONY += include/config/auto.conf
800 include/config/auto.conf:
801 @test -e include/generated/autoconf.h -a -e $@ || ( \
803 echo >&2 " ERROR: Kernel configuration is invalid."; \
804 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
805 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
809 endif # may-sync-config
812 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
814 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
816 KBUILD_RUSTFLAGS += -Copt-level=2
817 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
819 KBUILD_RUSTFLAGS += -Copt-level=s
822 # Always set `debug-assertions` and `overflow-checks` because their default
823 # depends on `opt-level` and `debug-assertions`, respectively.
824 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
825 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
827 # Tell gcc to never replace conditional load with a non-conditional one
828 ifdef CONFIG_CC_IS_GCC
829 # gcc-10 renamed --param=allow-store-data-races=0 to
830 # -fno-allow-store-data-races.
831 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
832 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
835 ifdef CONFIG_READABLE_ASM
836 # Disable optimizations that make assembler listings hard to read.
837 # reorder blocks reorders the control in the function
838 # ipa clone creates specialized cloned functions
839 # partial inlining inlines only parts of functions
840 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
843 stackp-flags-y := -fno-stack-protector
844 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
845 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
847 KBUILD_CFLAGS += $(stackp-flags-y)
849 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
850 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
852 ifdef CONFIG_FRAME_POINTER
853 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
854 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
856 # Some targets (ARM with Thumb2, for example), can't be built with frame
857 # pointers. For those, we don't have FUNCTION_TRACER automatically
858 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
859 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
860 # -fomit-frame-pointer with FUNCTION_TRACER.
861 # In the Rust target specification, "frame-pointer" is set explicitly
863 ifndef CONFIG_FUNCTION_TRACER
864 KBUILD_CFLAGS += -fomit-frame-pointer
868 # Initialize all stack variables with a 0xAA pattern.
869 ifdef CONFIG_INIT_STACK_ALL_PATTERN
870 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
873 # Initialize all stack variables with a zero value.
874 ifdef CONFIG_INIT_STACK_ALL_ZERO
875 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
876 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
877 # https://github.com/llvm/llvm-project/issues/44842
878 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
879 export CC_AUTO_VAR_INIT_ZERO_ENABLER
880 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
884 # While VLAs have been removed, GCC produces unreachable stack probes
885 # for the randomize_kstack_offset feature. Disable it for all compilers.
886 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
888 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
889 ifdef CONFIG_ZERO_CALL_USED_REGS
890 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
893 ifdef CONFIG_FUNCTION_TRACER
894 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
895 CC_FLAGS_FTRACE += -mrecord-mcount
896 ifdef CONFIG_HAVE_NOP_MCOUNT
897 ifeq ($(call cc-option-yn, -mnop-mcount),y)
898 CC_FLAGS_FTRACE += -mnop-mcount
899 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
903 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
904 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
905 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
908 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
909 ifdef CONFIG_HAVE_C_RECORDMCOUNT
910 BUILD_C_RECORDMCOUNT := y
911 export BUILD_C_RECORDMCOUNT
914 ifdef CONFIG_HAVE_FENTRY
915 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
916 ifeq ($(call cc-option-yn, -mfentry),y)
917 CC_FLAGS_FTRACE += -mfentry
918 CC_FLAGS_USING += -DCC_USING_FENTRY
921 export CC_FLAGS_FTRACE
922 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
923 KBUILD_AFLAGS += $(CC_FLAGS_USING)
926 # We trigger additional mismatches with less inlining
927 ifdef CONFIG_DEBUG_SECTION_MISMATCH
928 KBUILD_CFLAGS += -fno-inline-functions-called-once
931 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
932 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
933 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
934 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
935 LDFLAGS_vmlinux += --gc-sections
938 ifdef CONFIG_SHADOW_CALL_STACK
939 ifndef CONFIG_DYNAMIC_SCS
940 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
941 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
946 ifdef CONFIG_LTO_CLANG
947 ifdef CONFIG_LTO_CLANG_THIN
948 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
949 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
951 CC_FLAGS_LTO := -flto
953 CC_FLAGS_LTO += -fvisibility=hidden
955 # Limit inlining across translation units to reduce binary size
956 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
958 # Check for frame size exceeding threshold during prolog/epilog insertion
959 # when using lld < 13.0.0.
960 ifneq ($(CONFIG_FRAME_WARN),0)
961 ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y)
962 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
968 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
969 KBUILD_AFLAGS += -fno-lto
973 ifdef CONFIG_CFI_CLANG
974 CC_FLAGS_CFI := -fsanitize=kcfi
975 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
979 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
980 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
983 # arch Makefile may override CC so keep this after arch Makefile is included
984 NOSTDINC_FLAGS += -nostdinc
986 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
987 # the kernel uses only C99 flexible arrays for dynamically sized trailing
988 # arrays. Enforce this for everything that may examine structure sizes and
989 # perform bounds checking.
990 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
992 # disable invalid "can't wrap" optimizations for signed / pointers
993 KBUILD_CFLAGS += -fno-strict-overflow
995 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
996 KBUILD_CFLAGS += -fno-stack-check
998 # conserve stack if available
999 ifdef CONFIG_CC_IS_GCC
1000 KBUILD_CFLAGS += -fconserve-stack
1003 # change __FILE__ to the relative path from the srctree
1004 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1006 # include additional Makefiles when needed
1007 include-y := scripts/Makefile.extrawarn
1008 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1009 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
1010 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1011 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1012 include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan
1013 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1014 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1015 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct
1016 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1018 include $(addprefix $(srctree)/, $(include-y))
1020 # scripts/Makefile.gcc-plugins is intentionally included last.
1021 # Do not add $(call cc-option,...) below this line. When you build the kernel
1022 # from the clean source tree, the GCC plugins do not exist at this point.
1024 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1025 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1026 KBUILD_AFLAGS += $(KAFLAGS)
1027 KBUILD_CFLAGS += $(KCFLAGS)
1028 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1030 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1031 LDFLAGS_vmlinux += --build-id=sha1
1033 KBUILD_LDFLAGS += -z noexecstack
1034 ifeq ($(CONFIG_LD_IS_BFD),y)
1035 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
1038 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1039 LDFLAGS_vmlinux += -X
1042 ifeq ($(CONFIG_RELR),y)
1043 # ld.lld before 15 did not support -z pack-relative-relocs.
1044 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1047 # We never want expected sections to be placed heuristically by the
1048 # linker. All sections should be explicitly named in the linker script.
1049 ifdef CONFIG_LD_ORPHAN_WARN
1050 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1053 # Align the bit size of userspace programs with the kernel
1054 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1055 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1057 # make the checker run with the right architecture
1058 CHECKFLAGS += --arch=$(ARCH)
1060 # insure the checker run with the right endianness
1061 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1063 # the checker needs the correct machine size
1064 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1066 # Default kernel image to build when no specific target is given.
1067 # KBUILD_IMAGE may be overruled on the command line or
1068 # set in the environment
1069 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1070 # this default value
1071 export KBUILD_IMAGE ?= vmlinux
1074 # INSTALL_PATH specifies where to place the updated kernel and system map
1075 # images. Default is /boot, but you can set it to other values
1076 export INSTALL_PATH ?= /boot
1079 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1080 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1081 # an argument if needed. Otherwise it defaults to the kernel install path
1083 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1086 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1087 # relocations required by build roots. This is not defined in the
1088 # makefile but the argument can be passed to make if needed.
1091 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1096 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1097 export MODORDER := $(extmod_prefix)modules.order
1098 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1100 ifeq ($(KBUILD_EXTMOD),)
1103 clean-dirs := $(sort . Documentation \
1104 $(patsubst %/,%,$(filter %/, $(core-) \
1105 $(drivers-) $(libs-))))
1107 export ARCH_CORE := $(core-y)
1108 export ARCH_LIB := $(filter %/, $(libs-y))
1109 export ARCH_DRIVERS := $(drivers-y) $(drivers-m)
1110 # Externally visible symbols (used by link-vmlinux.sh)
1112 KBUILD_VMLINUX_OBJS := ./built-in.a
1113 ifdef CONFIG_MODULES
1114 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1115 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1117 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1120 export KBUILD_VMLINUX_LIBS
1121 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1123 ifdef CONFIG_TRIM_UNUSED_KSYMS
1124 # For the kernel to actually contain only the needed exported symbols,
1125 # we have to build modules as well to determine what those symbols are.
1129 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1130 quiet_cmd_ar_vmlinux.a = AR $@
1131 cmd_ar_vmlinux.a = \
1133 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1134 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1136 targets += vmlinux.a
1137 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1138 $(call if_changed,ar_vmlinux.a)
1141 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1142 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1144 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1148 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1149 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1150 # unrelated; the decompressors just happen to have the same base name,
1151 # arch/*/boot/compressed/vmlinux.
1152 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1154 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1155 # https://savannah.gnu.org/bugs/?61463
1156 # For Make > 4.4, the following simple code will work:
1157 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1158 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1159 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1160 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1161 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1163 # The actual objects are generated when descending,
1164 # make sure no implicit rule kicks in
1165 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1167 ifeq ($(origin KERNELRELEASE),file)
1168 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1170 filechk_kernel.release = echo $(KERNELRELEASE)
1173 # Store (new) KERNELRELEASE string in include/config/kernel.release
1174 include/config/kernel.release: FORCE
1175 $(call filechk,kernel.release)
1177 # Additional helpers built in scripts/
1178 # Carefully list dependencies so we do not try to build scripts twice
1181 scripts: scripts_basic scripts_dtc
1182 $(Q)$(MAKE) $(build)=$(@)
1184 # Things we need to do before we recursively start building the kernel
1185 # or the modules are listed in "prepare".
1186 # A multi level approach is used. prepareN is processed before prepareN-1.
1187 # archprepare is used in arch Makefiles and when processed asm symlink,
1188 # version.h and scripts_basic is processed / created.
1190 PHONY += prepare archprepare
1192 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1193 asm-generic $(version_h) include/generated/utsrelease.h \
1194 include/generated/compile.h include/generated/autoconf.h remove-stale-files
1196 prepare0: archprepare
1197 $(Q)$(MAKE) $(build)=scripts/mod
1198 $(Q)$(MAKE) $(build)=. prepare
1200 # All the preparing..
1203 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1204 $(Q)$(MAKE) $(build)=rust
1207 PHONY += remove-stale-files
1209 $(Q)$(srctree)/scripts/remove-stale-files
1211 # Support for using generic headers in asm-generic
1212 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1214 PHONY += asm-generic uapi-asm-generic
1215 asm-generic: uapi-asm-generic
1216 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1217 generic=include/asm-generic
1219 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1220 generic=include/uapi/asm-generic
1222 # Generate some files
1223 # ---------------------------------------------------------------------------
1225 # KERNELRELEASE can change from a few different places, meaning version.h
1226 # needs to be updated, so this check is forced on all builds
1229 define filechk_utsrelease.h
1230 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1231 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1234 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1237 define filechk_version.h
1238 if [ $(SUBLEVEL) -gt 255 ]; then \
1239 echo \#define LINUX_VERSION_CODE $(shell \
1240 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1242 echo \#define LINUX_VERSION_CODE $(shell \
1243 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1245 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1246 ((c) > 255 ? 255 : (c)))'; \
1247 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1248 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1249 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1252 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1253 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1255 $(call filechk,version.h)
1257 include/generated/utsrelease.h: include/config/kernel.release FORCE
1258 $(call filechk,utsrelease.h)
1260 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1261 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1263 include/generated/compile.h: FORCE
1264 $(call filechk,compile.h)
1268 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1269 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1271 # ---------------------------------------------------------------------------
1274 #Default location for installed headers
1275 export INSTALL_HDR_PATH = $(objtree)/usr
1277 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1278 cmd_headers_install = \
1279 mkdir -p $(INSTALL_HDR_PATH); \
1280 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1281 usr/include $(INSTALL_HDR_PATH)
1283 PHONY += headers_install
1284 headers_install: headers
1285 $(call cmd,headers_install)
1287 PHONY += archheaders archscripts
1289 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1292 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1293 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1294 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1295 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1297 ifdef CONFIG_HEADERS_INSTALL
1301 PHONY += scripts_unifdef
1302 scripts_unifdef: scripts_basic
1303 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1305 # ---------------------------------------------------------------------------
1308 # Many distributions have the custom install script, /sbin/installkernel.
1309 # If DKMS is installed, 'make install' will eventually recurse back
1310 # to this Makefile to build and install external modules.
1311 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1313 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1314 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1316 # ---------------------------------------------------------------------------
1319 PHONY += vdso_install
1320 vdso_install: export INSTALL_FILES = $(vdso-install-y)
1322 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
1324 # ---------------------------------------------------------------------------
1327 ifdef CONFIG_OBJTOOL
1328 prepare: tools/objtool
1332 ifdef CONFIG_DEBUG_INFO_BTF
1333 prepare: tools/bpf/resolve_btfids
1337 PHONY += resolve_btfids_clean
1339 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1341 # tools/bpf/resolve_btfids directory might not exist
1342 # in output directory, skip its clean in that case
1343 resolve_btfids_clean:
1344 ifneq ($(wildcard $(resolve_btfids_O)),)
1345 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1348 # Clear a bunch of variables before executing the submake
1349 ifeq ($(quiet),silent_)
1354 $(Q)mkdir -p $(objtree)/tools
1355 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1358 $(Q)mkdir -p $(objtree)/tools
1359 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1361 # ---------------------------------------------------------------------------
1366 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1368 kselftest-%: headers FORCE
1369 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1371 PHONY += kselftest-merge
1373 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1374 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \
1375 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
1376 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1378 # ---------------------------------------------------------------------------
1381 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1382 dtstree := arch/$(SRCARCH)/boot/dts
1388 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1390 %.dtbo: dtbs_prepare
1391 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1393 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1395 $(Q)$(MAKE) $(build)=$(dtstree)
1397 # include/config/kernel.release is actually needed when installing DTBs because
1398 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1399 # dtbs_install depend on it as dtbs_install may run as root.
1400 dtbs_prepare: include/config/kernel.release scripts_dtc
1402 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1406 ifneq ($(CHECK_DTBS),)
1407 dtbs_prepare: dt_binding_check
1413 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1415 ifdef CONFIG_OF_EARLY_FLATTREE
1421 PHONY += scripts_dtc
1422 scripts_dtc: scripts_basic
1423 $(Q)$(MAKE) $(build)=scripts/dtc
1425 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1426 export CHECK_DT_BINDING=y
1429 PHONY += dt_binding_check
1430 dt_binding_check: scripts_dtc
1431 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1433 PHONY += dt_compatible_check
1434 dt_compatible_check: dt_binding_check
1435 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1437 # ---------------------------------------------------------------------------
1440 ifdef CONFIG_MODULES
1442 # By default, build modules as well
1446 # When we're building modules with modversions, we need to consider
1447 # the built-in objects during the descend as well, in order to
1448 # make sure the checksums are up to date before we record them.
1449 ifdef CONFIG_MODVERSIONS
1456 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1458 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1463 modules: modules_prepare
1465 # Target to prepare building external modules
1466 modules_prepare: prepare
1467 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1469 endif # CONFIG_MODULES
1472 # Cleaning is done on three levels.
1473 # make clean Delete most generated files
1474 # Leave enough to build external modules
1475 # make mrproper Delete the current configuration, and all generated files
1476 # make distclean Remove editor backup files, patch leftover files and the like
1478 # Directories & files removed with 'make clean'
1479 CLEAN_FILES += vmlinux.symvers modules-only.symvers \
1480 modules.builtin modules.builtin.modinfo modules.nsdeps \
1481 compile_commands.json .thinlto-cache rust/test \
1482 rust-project.json .vmlinux.objs .vmlinux.export.c
1484 # Directories & files removed with 'make mrproper'
1485 MRPROPER_FILES += include/config include/generated \
1486 arch/$(SRCARCH)/include/generated .objdiff \
1487 debian snap tar-install \
1488 .config .config.old .version \
1490 certs/signing_key.pem \
1496 # clean - Delete most, but leave enough to build external modules
1498 clean: rm-files := $(CLEAN_FILES)
1500 PHONY += archclean vmlinuxclean
1503 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1504 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1506 clean: archclean vmlinuxclean resolve_btfids_clean
1508 # mrproper - Delete all generated files, including .config
1510 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1511 mrproper-dirs := $(addprefix _mrproper_,scripts)
1513 PHONY += $(mrproper-dirs) mrproper
1515 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1517 mrproper: clean $(mrproper-dirs)
1519 @find . $(RCS_FIND_IGNORE) \
1520 \( -name '*.rmeta' \) \
1521 -type f -print | xargs rm -f
1528 @find . $(RCS_FIND_IGNORE) \
1529 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1530 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1531 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1532 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1533 -type f -print | xargs rm -f
1536 # Packaging of the kernel to various formats
1537 # ---------------------------------------------------------------------------
1540 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1541 %pkg: include/config/kernel.release FORCE
1542 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1544 # Brief documentation of the typical targets used
1545 # ---------------------------------------------------------------------------
1547 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1548 boards := $(sort $(notdir $(boards)))
1549 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1550 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1554 @echo 'Cleaning targets:'
1555 @echo ' clean - Remove most generated files but keep the config and'
1556 @echo ' enough build support to build external modules'
1557 @echo ' mrproper - Remove all generated files + config + various backup files'
1558 @echo ' distclean - mrproper + remove editor backup and patch files'
1560 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1562 @echo 'Other generic targets:'
1563 @echo ' all - Build all targets marked with [*]'
1564 @echo '* vmlinux - Build the bare kernel'
1565 @echo '* modules - Build all modules'
1566 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1567 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1568 @echo ' dir/ - Build all files in dir and below'
1569 @echo ' dir/file.[ois] - Build specified target only'
1570 @echo ' dir/file.ll - Build the LLVM assembly file'
1571 @echo ' (requires compiler support for LLVM assembly generation)'
1572 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1573 @echo ' (requires a recent binutils and recent build (System.map))'
1574 @echo ' dir/file.ko - Build module including final link'
1575 @echo ' modules_prepare - Set up for building external modules'
1576 @echo ' tags/TAGS - Generate tags file for editors'
1577 @echo ' cscope - Generate cscope index'
1578 @echo ' gtags - Generate GNU GLOBAL index'
1579 @echo ' kernelrelease - Output the release version string (use with make -s)'
1580 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1581 @echo ' image_name - Output the image name (use with make -s)'
1582 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1583 echo ' (default: $(INSTALL_HDR_PATH))'; \
1585 @echo 'Static analysers:'
1586 @echo ' checkstack - Generate a list of stack hogs'
1587 @echo ' versioncheck - Sanity check on version.h usage'
1588 @echo ' includecheck - Check for duplicate included header files'
1589 @echo ' export_report - List the usages of all exported symbols'
1590 @echo ' headerdep - Detect inclusion cycles in headers'
1591 @echo ' coccicheck - Check with Coccinelle'
1592 @echo ' clang-analyzer - Check with clang static analyzer'
1593 @echo ' clang-tidy - Check with clang-tidy'
1596 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1598 @echo 'Kernel selftest:'
1599 @echo ' kselftest - Build and run kernel selftest'
1600 @echo ' Build, install, and boot kernel before'
1601 @echo ' running kselftest on it'
1602 @echo ' Run as root for full coverage'
1603 @echo ' kselftest-all - Build kernel selftest'
1604 @echo ' kselftest-install - Build and install kernel selftest'
1605 @echo ' kselftest-clean - Remove all generated kselftest files'
1606 @echo ' kselftest-merge - Merge all the config dependencies of'
1607 @echo ' kselftest to existing .config.'
1609 @echo 'Rust targets:'
1610 @echo ' rustavailable - Checks whether the Rust toolchain is'
1611 @echo ' available and, if not, explains why.'
1612 @echo ' rustfmt - Reformat all the Rust code in the kernel'
1613 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel'
1614 @echo ' is formatted, printing a diff otherwise.'
1615 @echo ' rustdoc - Generate Rust documentation'
1616 @echo ' (requires kernel .config)'
1617 @echo ' rusttest - Runs the Rust tests'
1618 @echo ' (requires kernel .config; downloads external repos)'
1619 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1620 @echo ' (requires kernel .config)'
1621 @echo ' dir/file.[os] - Build specified target only'
1622 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1623 @echo ' Run with RUSTFMT=n to skip reformatting if needed.'
1624 @echo ' The output is not intended to be compilable.'
1625 @echo ' dir/file.ll - Build the LLVM assembly file'
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)):'
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=n [targets] 1: verbose build'
1660 @echo ' 2: give reason for rebuild of target'
1661 @echo ' V=1 and V=2 can be combined with V=12'
1662 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1663 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1664 @echo ' (sparse by default)'
1665 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1666 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1667 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1668 @echo ' 1: warnings which may be relevant and do not occur too often'
1669 @echo ' 2: warnings which occur quite often but may still be relevant'
1670 @echo ' 3: more obscure warnings, can most likely be ignored'
1671 @echo ' c: extra checks in the configuration stage (Kconfig)'
1672 @echo ' e: warnings are being treated as errors'
1673 @echo ' Multiple levels can be combined with W=12 or W=123'
1675 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1676 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1679 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1680 @echo 'For further info see the ./README file'
1683 help-board-dirs := $(addprefix help-,$(board-dirs))
1685 help-boards: $(help-board-dirs)
1687 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1689 $(help-board-dirs): help-%:
1690 @echo 'Architecture-specific targets ($(SRCARCH) $*):'
1691 @$(if $(boards-per-dir), \
1692 $(foreach b, $(boards-per-dir), \
1693 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1697 # Documentation targets
1698 # ---------------------------------------------------------------------------
1699 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1700 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1701 PHONY += $(DOC_TARGETS)
1703 $(Q)$(MAKE) $(build)=Documentation $@
1707 # ---------------------------------------------------------------------------
1709 # "Is Rust available?" target
1710 PHONY += rustavailable
1712 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!"
1714 # Documentation target
1716 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1719 $(Q)$(MAKE) $(build)=rust $@
1724 $(Q)$(MAKE) $(build)=rust $@
1726 # Formatting targets
1727 PHONY += rustfmt rustfmtcheck
1729 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1731 # We match using absolute paths since `find` does not resolve them
1732 # when matching, which is a problem when e.g. `srctree` is `..`.
1733 # We `grep` afterwards in order to remove the directory entry itself.
1735 $(Q)find $(abs_srctree) -type f -name '*.rs' \
1736 -o -path $(abs_srctree)/rust/alloc -prune \
1737 -o -path $(abs_objtree)/rust/test -prune \
1738 | grep -Fv $(abs_srctree)/rust/alloc \
1739 | grep -Fv $(abs_objtree)/rust/test \
1740 | grep -Fv generated \
1741 | xargs $(RUSTFMT) $(rustfmt_flags)
1743 rustfmtcheck: rustfmt_flags = --check
1744 rustfmtcheck: rustfmt
1747 # ---------------------------------------------------------------------------
1751 $(Q)$(srctree)/scripts/misc-check
1755 PHONY += scripts_gdb
1756 scripts_gdb: prepare0
1757 $(Q)$(MAKE) $(build)=scripts/gdb
1758 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1760 ifdef CONFIG_GDB_SCRIPTS
1764 else # KBUILD_EXTMOD
1766 filechk_kernel.release = echo $(KERNELRELEASE)
1769 # External module support.
1770 # When building external modules the kernel used as basis is considered
1771 # read-only, and no consistency checks are made and the make
1772 # system is not used on the basis kernel. If updates are required
1773 # in the basis kernel ordinary make commands (without M=...) must be used.
1775 # We are always building only modules.
1779 build-dir := $(KBUILD_EXTMOD)
1781 compile_commands.json: $(extmod_prefix)compile_commands.json
1782 PHONY += compile_commands.json
1784 clean-dirs := $(KBUILD_EXTMOD)
1785 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1786 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1789 # now expand this into a simple variable to reduce the cost of shell evaluations
1790 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1792 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1793 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1794 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1795 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1800 @echo ' Building external modules.'
1801 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1803 @echo ' modules - default target, build the module(s)'
1804 @echo ' modules_install - install the module'
1805 @echo ' clean - remove generated files in module directory only'
1806 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file'
1809 ifndef CONFIG_MODULES
1810 modules modules_install: __external_modules_error
1811 __external_modules_error:
1813 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1814 @echo >&2 '*** You cannot build or install external modules.'
1819 endif # KBUILD_EXTMOD
1821 # ---------------------------------------------------------------------------
1824 PHONY += modules modules_install modules_sign modules_prepare
1827 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \
1828 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y)
1830 ifeq ($(CONFIG_MODULE_SIG),y)
1831 # modules_sign is a subset of modules_install.
1832 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1833 modules_sign: modules_install
1838 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1843 ifdef CONFIG_MODULES
1845 $(MODORDER): $(build-dir)
1848 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1849 # This is solely useful to speed up test compiles.
1851 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1852 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1855 PHONY += modules_check
1856 modules_check: $(MODORDER)
1857 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1859 else # CONFIG_MODULES
1866 endif # CONFIG_MODULES
1869 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1870 $(if $(KBUILD_MODULES), modules_check)
1871 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1874 # ---------------------------------------------------------------------------
1875 # To build individual files in subdirectories, you can do like this:
1877 # make foo/bar/baz.s
1879 # The supported suffixes for single-target are listed in 'single-targets'
1881 # To build only under specific subdirectories, you can do like this:
1887 # .ko is special because modpost is needed
1888 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1889 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1890 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1892 $(single-ko): single_modules
1894 $(single-no-ko): $(build-dir)
1897 # Remove MODORDER when done because it is not the real one.
1898 PHONY += single_modules
1899 single_modules: $(single-no-ko) modules_prepare
1900 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
1901 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1902 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1903 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1905 $(Q)rm -f $(MODORDER)
1907 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
1913 # Preset locale variables to speed up the build process. Limit locale
1914 # tweaks to this spot to avoid wrong language settings when running
1915 # make menuconfig etc.
1916 # Error messages still appears in the original language
1917 PHONY += $(build-dir)
1918 $(build-dir): prepare
1919 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
1921 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1922 PHONY += $(clean-dirs) clean
1924 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1926 clean: $(clean-dirs)
1928 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1929 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
1931 -o -name '*.dtb' -o -name '*.dtbo' \
1932 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
1933 -o -name '*.dt.yaml' \
1934 -o -name '*.dwo' -o -name '*.lst' \
1935 -o -name '*.su' -o -name '*.mod' \
1936 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1937 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1938 -o -name '*.asn1.[ch]' \
1939 -o -name '*.symtypes' -o -name 'modules.order' \
1940 -o -name '*.c.[012]*.*' \
1943 -o -name '*.*.symversions' \) -type f -print \
1944 -o -name '.tmp_*' -print \
1947 # Generate tags for editors
1948 # ---------------------------------------------------------------------------
1949 quiet_cmd_tags = GEN $@
1950 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1952 tags TAGS cscope gtags: FORCE
1955 # IDE support targets
1956 PHONY += rust-analyzer
1958 $(Q)$(MAKE) $(build)=rust $@
1960 # Script to generate missing namespace dependencies
1961 # ---------------------------------------------------------------------------
1964 nsdeps: export KBUILD_NSDEPS=1
1966 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1969 # ---------------------------------------------------------------------------
1971 quiet_cmd_gen_compile_commands = GEN $@
1972 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1974 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1975 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
1976 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1977 $(call if_changed,gen_compile_commands)
1979 targets += $(extmod_prefix)compile_commands.json
1981 PHONY += clang-tidy clang-analyzer
1983 ifdef CONFIG_CC_IS_CLANG
1984 quiet_cmd_clang_tools = CHECK $<
1985 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1987 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1988 $(call cmd,clang_tools)
1990 clang-tidy clang-analyzer:
1991 @echo "$@ requires CC=clang" >&2
1995 # Scripts to check various things for consistency
1996 # ---------------------------------------------------------------------------
1998 PHONY += includecheck versioncheck coccicheck export_report
2001 find $(srctree)/* $(RCS_FIND_IGNORE) \
2002 -name '*.[hcS]' -type f -print | sort \
2003 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2006 find $(srctree)/* $(RCS_FIND_IGNORE) \
2007 -name '*.[hcS]' -type f -print | sort \
2008 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2011 $(Q)$(BASH) $(srctree)/scripts/$@
2014 $(PERL) $(srctree)/scripts/export_report.pl
2016 PHONY += checkstack kernelrelease kernelversion image_name
2018 # UML needs a little special treatment here. It wants to use the host
2019 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2020 # else wants $(ARCH), including people doing cross-builds, which means
2021 # that $(SUBARCH) doesn't work here.
2023 CHECKSTACK_ARCH := $(SUBARCH)
2025 CHECKSTACK_ARCH := $(ARCH)
2028 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2029 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2032 @$(filechk_kernel.release)
2035 @echo $(KERNELVERSION)
2038 @echo $(KBUILD_IMAGE)
2040 PHONY += run-command
2042 $(Q)$(KBUILD_RUN_COMMAND)
2044 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2045 cmd_rmfiles = rm -rf $(rm-files)
2047 # read saved command lines for existing targets
2048 existing-targets := $(wildcard $(sort $(targets)))
2050 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2052 endif # config-build
2054 endif # need-sub-make
2059 # Declare the contents of the PHONY variable as phony. We keep that
2060 # information in a variable so we can use it in if_changed and friends.