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 $(KBUILD_EXTMOD).)
158 # Kbuild will save output files in the current working directory.
159 # This does not need to match to the root of the kernel source tree.
161 # For example, you can do this:
163 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
165 # If you want to save output files in a different location, there are
166 # two syntaxes to specify it.
169 # Use "make O=dir/to/store/output/files/"
171 # 2) Set KBUILD_OUTPUT
172 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
173 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
175 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
178 # Do we want to change the working directory?
179 ifeq ("$(origin O)", "command line")
180 KBUILD_OUTPUT := $(O)
183 ifneq ($(KBUILD_OUTPUT),)
184 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
185 # expand a shell special character '~'. We use a somewhat tedious way here.
186 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
187 $(if $(abs_objtree),, \
188 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
190 # $(realpath ...) resolves symlinks
191 abs_objtree := $(realpath $(abs_objtree))
192 endif # ifneq ($(KBUILD_OUTPUT),)
194 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
195 $(error source directory cannot contain spaces or colons)
198 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
199 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
200 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
202 # Cancel implicit rules for this Makefile.
206 export sub_make_done := 1
208 endif # sub_make_done
210 ifeq ($(abs_objtree),$(CURDIR))
211 # Suppress "Entering directory ..." if we are at the final work directory.
212 no-print-directory := --no-print-directory
214 # Recursion to show "Entering directory ..."
218 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
219 # If --no-print-directory is unset, recurse once again to set it.
220 # You may end up recursing into __sub-make twice. This is needed due to the
221 # behavior change in GNU Make 4.4.1.
225 ifeq ($(need-sub-make),1)
227 PHONY += $(MAKECMDGOALS) __sub-make
229 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
232 # Invoke a second make in the output directory, passing relevant variables
234 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
235 -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
239 # We process the rest of the Makefile if this is the final invocation of make
241 ifeq ($(abs_srctree),$(abs_objtree))
242 # building in the source tree
244 building_out_of_srctree :=
246 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
247 # building in a subdirectory of the source tree
250 srctree := $(abs_srctree)
252 building_out_of_srctree := 1
255 ifneq ($(KBUILD_ABS_SRCTREE),)
256 srctree := $(abs_srctree)
262 export building_out_of_srctree srctree objtree VPATH
264 # To make sure we do not include .config for any of the *config targets
265 # catch them early, and hand them over to scripts/kconfig/Makefile
266 # It is allowed to specify more targets when calling make, including
267 # mixing *config targets and build targets.
268 # For example 'make oldconfig all'.
269 # Detect when mixed targets is specified, and make a second invocation
270 # of make so .config is not included in this case either (for *config).
272 version_h := include/generated/uapi/linux/version.h
274 clean-targets := %clean mrproper cleandocs
275 no-dot-config-targets := $(clean-targets) \
276 cscope gtags TAGS tags help% %docs check% coccicheck \
277 $(version_h) headers headers_% archheaders archscripts \
278 %asm-generic kernelversion %src-pkg dt_binding_check \
279 outputmakefile rustavailable rustfmt rustfmtcheck
280 # Installation targets should not require compiler. Unfortunately, vdso_install
281 # is an exception where build artifacts may be updated. This must be fixed.
282 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
283 headers_install modules_install kernelrelease image_name
284 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
286 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
295 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
296 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
301 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
302 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
307 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
308 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
313 ifneq ($(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=ia64-linux-
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 -Wdeclaration-after-statement
454 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
455 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
457 # These flags apply to all Rust code in the tree, including the kernel and
459 export rust_common_flags := --edition=2021 \
460 -Zbinary_dep_depinfo=y \
461 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
462 -Dunreachable_pub -Dnon_ascii_idents \
464 -Drustdoc::missing_crate_level_docs \
465 -Dclippy::correctness -Dclippy::style \
466 -Dclippy::suspicious -Dclippy::complexity \
468 -Dclippy::let_unit_value -Dclippy::mut_mut \
469 -Dclippy::needless_bitwise_bool \
470 -Dclippy::needless_continue \
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
526 PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
528 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
529 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
540 # Use USERINCLUDE when you must reference the UAPI directories only.
542 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
543 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
544 -I$(srctree)/include/uapi \
545 -I$(objtree)/include/generated/uapi \
546 -include $(srctree)/include/linux/compiler-version.h \
547 -include $(srctree)/include/linux/kconfig.h
549 # Use LINUXINCLUDE when you must reference the include/ directory.
550 # Needed to be compatible with the O= option
552 -I$(srctree)/arch/$(SRCARCH)/include \
553 -I$(objtree)/arch/$(SRCARCH)/include/generated \
554 $(if $(building_out_of_srctree),-I$(srctree)/include) \
555 -I$(objtree)/include \
558 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
559 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
560 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
561 -Werror=implicit-function-declaration -Werror=implicit-int \
562 -Werror=return-type -Wno-format-security -funsigned-char \
564 KBUILD_CPPFLAGS := -D__KERNEL__
565 KBUILD_RUSTFLAGS := $(rust_common_flags) \
566 --target=$(objtree)/scripts/target.json \
567 -Cpanic=abort -Cembed-bitcode=n -Clto=n \
568 -Cforce-unwind-tables=n -Ccodegen-units=1 \
569 -Csymbol-mangling-version=v0 \
570 -Crelocation-model=static \
571 -Zfunction-sections=n \
572 -Dclippy::float_arithmetic
574 KBUILD_AFLAGS_KERNEL :=
575 KBUILD_CFLAGS_KERNEL :=
576 KBUILD_RUSTFLAGS_KERNEL :=
577 KBUILD_AFLAGS_MODULE := -DMODULE
578 KBUILD_CFLAGS_MODULE := -DMODULE
579 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
580 KBUILD_LDFLAGS_MODULE :=
584 ifeq ($(KBUILD_CLIPPY),1)
585 RUSTC_OR_CLIPPY_QUIET := CLIPPY
586 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
588 RUSTC_OR_CLIPPY_QUIET := RUSTC
589 RUSTC_OR_CLIPPY = $(RUSTC)
596 # Allows the usage of unstable features in stable compilers.
597 export RUSTC_BOOTSTRAP := 1
599 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
600 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
601 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
602 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
603 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
604 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
605 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
606 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
608 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
609 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
610 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
611 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
612 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
613 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
616 # Files to ignore in find ... statements
618 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
619 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
621 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
622 --exclude CVS --exclude .pc --exclude .hg --exclude .git
624 # ===========================================================================
625 # Rules shared between *config targets and build targets
627 # Basic helpers built in scripts/basic/
628 PHONY += scripts_basic
630 $(Q)$(MAKE) $(build)=scripts/basic
632 PHONY += outputmakefile
633 ifdef building_out_of_srctree
634 # Before starting out-of-tree build, make sure the source tree is clean.
635 # outputmakefile generates a Makefile in the output directory, if using a
636 # separate output directory. This allows convenient use of make in the
638 # At the same time when output Makefile generated, generate .gitignore to
639 # ignore whole output directory
641 quiet_cmd_makefile = GEN Makefile
643 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
644 echo "include $(srctree)/Makefile"; \
648 @if [ -f $(srctree)/.config -o \
649 -d $(srctree)/include/config -o \
650 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
652 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
653 echo >&2 "*** in $(abs_srctree)";\
657 $(Q)ln -fsn $(srctree) source
659 $(Q)test -e .gitignore || \
660 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
663 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
664 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
665 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
666 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
667 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
669 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
670 include $(srctree)/scripts/Makefile.clang
673 # Include this also for config targets because some architectures need
674 # cc-cross-prefix to determine CROSS_COMPILE.
676 include $(srctree)/scripts/Makefile.compiler
680 # ===========================================================================
681 # *config targets only - make sure prerequisites are updated, and descend
682 # in scripts/kconfig to make the *config target
684 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
685 # KBUILD_DEFCONFIG may point out an alternative default configuration
686 # used for 'make defconfig'
687 include $(srctree)/arch/$(SRCARCH)/Makefile
688 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
690 config: outputmakefile scripts_basic FORCE
691 $(Q)$(MAKE) $(build)=scripts/kconfig $@
693 %config: outputmakefile scripts_basic FORCE
694 $(Q)$(MAKE) $(build)=scripts/kconfig $@
697 # ===========================================================================
698 # Build targets only - this includes vmlinux, arch specific targets, clean
699 # targets and others. In general all targets except *config targets.
701 # If building an external module we do not care about the all: rule
702 # but instead __all depend on modules
704 ifeq ($(KBUILD_EXTMOD),)
712 # Decide whether to build built-in, modular, or both.
713 # Normally, just do built-in.
718 # If we have only "make modules", don't compile built-in objects.
719 ifeq ($(MAKECMDGOALS),modules)
723 # If we have "make <whatever> modules", compile modules
724 # in addition to whatever we do anyway.
725 # Just "make" or "make all" shall build modules as well
727 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
731 ifeq ($(MAKECMDGOALS),)
735 export KBUILD_MODULES KBUILD_BUILTIN
738 include include/config/auto.conf
741 ifeq ($(KBUILD_EXTMOD),)
742 # Objects we will link into vmlinux / subdirs we need to visit
746 endif # KBUILD_EXTMOD
748 # The all: target is the default when no target is given on the
750 # This allow a user to issue only 'make' to build a kernel including modules
751 # Defaults to vmlinux, but the arch makefile usually adds further targets
754 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
755 ifdef CONFIG_CC_IS_GCC
756 CFLAGS_GCOV += -fno-tree-loop-im
760 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
761 ifdef CONFIG_FUNCTION_TRACER
762 CC_FLAGS_FTRACE := -pg
765 include $(srctree)/arch/$(SRCARCH)/Makefile
768 ifdef may-sync-config
769 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
770 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
771 # because some architectures define CROSS_COMPILE there.
772 include include/config/auto.conf.cmd
776 @echo >&2 '*** Configuration file "$@" not found!'
778 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
779 @echo >&2 '*** "make menuconfig" or "make xconfig").'
783 # The actual configuration files used during the build are stored in
784 # include/generated/ and include/config/. Update them if .config is newer than
785 # include/config/auto.conf (which mirrors .config).
787 # This exploits the 'multi-target pattern rule' trick.
788 # The syncconfig should be executed only once to make all the targets.
789 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
791 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
792 # so you cannot notice that Kconfig is waiting for the user input.
793 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
794 $(Q)$(kecho) " SYNC $@"
795 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
796 else # !may-sync-config
797 # External modules and some install targets need include/generated/autoconf.h
798 # and include/config/auto.conf but do not care if they are up-to-date.
799 # Use auto.conf to trigger the test
800 PHONY += include/config/auto.conf
802 include/config/auto.conf:
803 @test -e include/generated/autoconf.h -a -e $@ || ( \
805 echo >&2 " ERROR: Kernel configuration is invalid."; \
806 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
807 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
811 endif # may-sync-config
814 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
815 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
816 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
817 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
818 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
820 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
822 KBUILD_RUSTFLAGS += -Copt-level=2
823 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
825 KBUILD_RUSTFLAGS += -Copt-level=s
828 # Always set `debug-assertions` and `overflow-checks` because their default
829 # depends on `opt-level` and `debug-assertions`, respectively.
830 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
831 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
833 # Tell gcc to never replace conditional load with a non-conditional one
834 ifdef CONFIG_CC_IS_GCC
835 # gcc-10 renamed --param=allow-store-data-races=0 to
836 # -fno-allow-store-data-races.
837 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
838 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
841 ifdef CONFIG_READABLE_ASM
842 # Disable optimizations that make assembler listings hard to read.
843 # reorder blocks reorders the control in the function
844 # ipa clone creates specialized cloned functions
845 # partial inlining inlines only parts of functions
846 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
849 ifneq ($(CONFIG_FRAME_WARN),0)
850 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
853 stackp-flags-y := -fno-stack-protector
854 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
855 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
857 KBUILD_CFLAGS += $(stackp-flags-y)
859 KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
860 KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
861 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
863 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
864 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
866 ifdef CONFIG_CC_IS_CLANG
867 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
868 KBUILD_CFLAGS += -Wno-gnu
871 # gcc inanely warns about local variables called 'main'
872 KBUILD_CFLAGS += -Wno-main
875 # These warnings generated too much noise in a regular build.
876 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
877 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
878 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
880 # These result in bogus false positives
881 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
883 ifdef CONFIG_FRAME_POINTER
884 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
885 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
887 # Some targets (ARM with Thumb2, for example), can't be built with frame
888 # pointers. For those, we don't have FUNCTION_TRACER automatically
889 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
890 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
891 # -fomit-frame-pointer with FUNCTION_TRACER.
892 # In the Rust target specification, "frame-pointer" is set explicitly
894 ifndef CONFIG_FUNCTION_TRACER
895 KBUILD_CFLAGS += -fomit-frame-pointer
899 # Initialize all stack variables with a 0xAA pattern.
900 ifdef CONFIG_INIT_STACK_ALL_PATTERN
901 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
904 # Initialize all stack variables with a zero value.
905 ifdef CONFIG_INIT_STACK_ALL_ZERO
906 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
907 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
908 # https://github.com/llvm/llvm-project/issues/44842
909 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
910 export CC_AUTO_VAR_INIT_ZERO_ENABLER
911 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
915 # While VLAs have been removed, GCC produces unreachable stack probes
916 # for the randomize_kstack_offset feature. Disable it for all compilers.
917 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
919 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
920 ifdef CONFIG_ZERO_CALL_USED_REGS
921 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
924 ifdef CONFIG_FUNCTION_TRACER
925 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
926 CC_FLAGS_FTRACE += -mrecord-mcount
927 ifdef CONFIG_HAVE_NOP_MCOUNT
928 ifeq ($(call cc-option-yn, -mnop-mcount),y)
929 CC_FLAGS_FTRACE += -mnop-mcount
930 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
934 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
935 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
936 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
939 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
940 ifdef CONFIG_HAVE_C_RECORDMCOUNT
941 BUILD_C_RECORDMCOUNT := y
942 export BUILD_C_RECORDMCOUNT
945 ifdef CONFIG_HAVE_FENTRY
946 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
947 ifeq ($(call cc-option-yn, -mfentry),y)
948 CC_FLAGS_FTRACE += -mfentry
949 CC_FLAGS_USING += -DCC_USING_FENTRY
952 export CC_FLAGS_FTRACE
953 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
954 KBUILD_AFLAGS += $(CC_FLAGS_USING)
957 # We trigger additional mismatches with less inlining
958 ifdef CONFIG_DEBUG_SECTION_MISMATCH
959 KBUILD_CFLAGS += -fno-inline-functions-called-once
962 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
963 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
964 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
965 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
966 LDFLAGS_vmlinux += --gc-sections
969 ifdef CONFIG_SHADOW_CALL_STACK
970 ifndef CONFIG_DYNAMIC_SCS
971 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
972 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
977 ifdef CONFIG_LTO_CLANG
978 ifdef CONFIG_LTO_CLANG_THIN
979 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
980 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
982 CC_FLAGS_LTO := -flto
984 CC_FLAGS_LTO += -fvisibility=hidden
986 # Limit inlining across translation units to reduce binary size
987 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
989 # Check for frame size exceeding threshold during prolog/epilog insertion
990 # when using lld < 13.0.0.
991 ifneq ($(CONFIG_FRAME_WARN),0)
992 ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y)
993 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
999 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
1000 KBUILD_AFLAGS += -fno-lto
1004 ifdef CONFIG_CFI_CLANG
1005 CC_FLAGS_CFI := -fsanitize=kcfi
1006 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
1010 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
1011 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
1014 # arch Makefile may override CC so keep this after arch Makefile is included
1015 NOSTDINC_FLAGS += -nostdinc
1017 # warn about C99 declaration after statement
1018 KBUILD_CFLAGS += -Wdeclaration-after-statement
1020 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1021 KBUILD_CFLAGS += -Wvla
1023 # disable pointer signed / unsigned warnings in gcc 4.0
1024 KBUILD_CFLAGS += -Wno-pointer-sign
1026 # In order to make sure new function cast mismatches are not introduced
1027 # in the kernel (to avoid tripping CFI checking), the kernel should be
1028 # globally built with -Wcast-function-type.
1029 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
1031 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
1032 # the kernel uses only C99 flexible arrays for dynamically sized trailing
1033 # arrays. Enforce this for everything that may examine structure sizes and
1034 # perform bounds checking.
1035 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
1037 # disable stringop warnings in gcc 8+
1038 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
1040 # We'll want to enable this eventually, but it's not going away for 5.7 at least
1041 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
1043 # Another good warning that we'll want to enable eventually
1044 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1046 # Enabled with W=2, disabled by default as noisy
1047 ifdef CONFIG_CC_IS_GCC
1048 KBUILD_CFLAGS += -Wno-maybe-uninitialized
1051 # The allocators already balk at large sizes, so silence the compiler
1052 # warnings for bounds checks involving those possible values. While
1053 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
1054 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
1055 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1056 # doesn't work (as it is documented to), silently resolving to "0" prior to
1057 # version 9.1 (and producing an error more recently). Numeric values larger
1058 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1059 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1060 # choice, we must perform a versioned check to disable this warning.
1061 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
1062 KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
1063 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
1065 # disable invalid "can't wrap" optimizations for signed / pointers
1066 KBUILD_CFLAGS += -fno-strict-overflow
1068 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1069 KBUILD_CFLAGS += -fno-stack-check
1071 # conserve stack if available
1072 ifdef CONFIG_CC_IS_GCC
1073 KBUILD_CFLAGS += -fconserve-stack
1076 # Prohibit date/time macros, which would make the build non-deterministic
1077 KBUILD_CFLAGS += -Werror=date-time
1079 # enforce correct pointer usage
1080 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
1082 # Require designated initializers for all marked structures
1083 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1085 # change __FILE__ to the relative path from the srctree
1086 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1088 # include additional Makefiles when needed
1089 include-y := scripts/Makefile.extrawarn
1090 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1091 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1092 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1093 include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan
1094 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1095 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1096 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct
1097 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1099 include $(addprefix $(srctree)/, $(include-y))
1101 # scripts/Makefile.gcc-plugins is intentionally included last.
1102 # Do not add $(call cc-option,...) below this line. When you build the kernel
1103 # from the clean source tree, the GCC plugins do not exist at this point.
1105 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1106 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1107 KBUILD_AFLAGS += $(KAFLAGS)
1108 KBUILD_CFLAGS += $(KCFLAGS)
1109 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1111 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1112 LDFLAGS_vmlinux += --build-id=sha1
1114 KBUILD_LDFLAGS += -z noexecstack
1115 ifeq ($(CONFIG_LD_IS_BFD),y)
1116 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
1119 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1120 LDFLAGS_vmlinux += -X
1123 ifeq ($(CONFIG_RELR),y)
1124 # ld.lld before 15 did not support -z pack-relative-relocs.
1125 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1128 # We never want expected sections to be placed heuristically by the
1129 # linker. All sections should be explicitly named in the linker script.
1130 ifdef CONFIG_LD_ORPHAN_WARN
1131 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1134 # Align the bit size of userspace programs with the kernel
1135 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1136 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1138 # make the checker run with the right architecture
1139 CHECKFLAGS += --arch=$(ARCH)
1141 # insure the checker run with the right endianness
1142 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1144 # the checker needs the correct machine size
1145 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1147 # Default kernel image to build when no specific target is given.
1148 # KBUILD_IMAGE may be overruled on the command line or
1149 # set in the environment
1150 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1151 # this default value
1152 export KBUILD_IMAGE ?= vmlinux
1155 # INSTALL_PATH specifies where to place the updated kernel and system map
1156 # images. Default is /boot, but you can set it to other values
1157 export INSTALL_PATH ?= /boot
1160 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1161 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1162 # an argument if needed. Otherwise it defaults to the kernel install path
1164 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1167 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1168 # relocations required by build roots. This is not defined in the
1169 # makefile but the argument can be passed to make if needed.
1172 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1177 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1178 export MODORDER := $(extmod_prefix)modules.order
1179 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1181 ifeq ($(KBUILD_EXTMOD),)
1184 clean-dirs := $(sort . Documentation \
1185 $(patsubst %/,%,$(filter %/, $(core-) \
1186 $(drivers-) $(libs-))))
1188 export ARCH_CORE := $(core-y)
1189 export ARCH_LIB := $(filter %/, $(libs-y))
1190 export ARCH_DRIVERS := $(drivers-y) $(drivers-m)
1191 # Externally visible symbols (used by link-vmlinux.sh)
1193 KBUILD_VMLINUX_OBJS := ./built-in.a
1194 ifdef CONFIG_MODULES
1195 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1196 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1198 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1201 export KBUILD_VMLINUX_LIBS
1202 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1204 ifdef CONFIG_TRIM_UNUSED_KSYMS
1205 # For the kernel to actually contain only the needed exported symbols,
1206 # we have to build modules as well to determine what those symbols are.
1210 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1211 quiet_cmd_ar_vmlinux.a = AR $@
1212 cmd_ar_vmlinux.a = \
1214 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1215 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1217 targets += vmlinux.a
1218 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1219 $(call if_changed,ar_vmlinux.a)
1222 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1223 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1225 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1229 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1230 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1231 # unrelated; the decompressors just happen to have the same base name,
1232 # arch/*/boot/compressed/vmlinux.
1233 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1235 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1236 # https://savannah.gnu.org/bugs/?61463
1237 # For Make > 4.4, the following simple code will work:
1238 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1239 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1240 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1241 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1242 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1244 # The actual objects are generated when descending,
1245 # make sure no implicit rule kicks in
1246 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1248 ifeq ($(origin KERNELRELEASE),file)
1249 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1251 filechk_kernel.release = echo $(KERNELRELEASE)
1254 # Store (new) KERNELRELEASE string in include/config/kernel.release
1255 include/config/kernel.release: FORCE
1256 $(call filechk,kernel.release)
1258 # Additional helpers built in scripts/
1259 # Carefully list dependencies so we do not try to build scripts twice
1262 scripts: scripts_basic scripts_dtc
1263 $(Q)$(MAKE) $(build)=$(@)
1265 # Things we need to do before we recursively start building the kernel
1266 # or the modules are listed in "prepare".
1267 # A multi level approach is used. prepareN is processed before prepareN-1.
1268 # archprepare is used in arch Makefiles and when processed asm symlink,
1269 # version.h and scripts_basic is processed / created.
1271 PHONY += prepare archprepare
1273 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1274 asm-generic $(version_h) include/generated/utsrelease.h \
1275 include/generated/compile.h include/generated/autoconf.h remove-stale-files
1277 prepare0: archprepare
1278 $(Q)$(MAKE) $(build)=scripts/mod
1279 $(Q)$(MAKE) $(build)=. prepare
1281 # All the preparing..
1284 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v
1285 $(Q)$(MAKE) $(build)=rust
1288 PHONY += remove-stale-files
1290 $(Q)$(srctree)/scripts/remove-stale-files
1292 # Support for using generic headers in asm-generic
1293 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1295 PHONY += asm-generic uapi-asm-generic
1296 asm-generic: uapi-asm-generic
1297 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1298 generic=include/asm-generic
1300 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1301 generic=include/uapi/asm-generic
1303 # Generate some files
1304 # ---------------------------------------------------------------------------
1306 # KERNELRELEASE can change from a few different places, meaning version.h
1307 # needs to be updated, so this check is forced on all builds
1310 define filechk_utsrelease.h
1311 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1312 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1315 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1318 define filechk_version.h
1319 if [ $(SUBLEVEL) -gt 255 ]; then \
1320 echo \#define LINUX_VERSION_CODE $(shell \
1321 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1323 echo \#define LINUX_VERSION_CODE $(shell \
1324 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1326 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1327 ((c) > 255 ? 255 : (c)))'; \
1328 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1329 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1330 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1333 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1334 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1336 $(call filechk,version.h)
1338 include/generated/utsrelease.h: include/config/kernel.release FORCE
1339 $(call filechk,utsrelease.h)
1341 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1342 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1344 include/generated/compile.h: FORCE
1345 $(call filechk,compile.h)
1349 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1350 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1352 # ---------------------------------------------------------------------------
1355 #Default location for installed headers
1356 export INSTALL_HDR_PATH = $(objtree)/usr
1358 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1359 cmd_headers_install = \
1360 mkdir -p $(INSTALL_HDR_PATH); \
1361 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1362 usr/include $(INSTALL_HDR_PATH)
1364 PHONY += headers_install
1365 headers_install: headers
1366 $(call cmd,headers_install)
1368 PHONY += archheaders archscripts
1370 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1373 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1374 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1375 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1376 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1378 ifdef CONFIG_HEADERS_INSTALL
1382 PHONY += scripts_unifdef
1383 scripts_unifdef: scripts_basic
1384 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1386 # ---------------------------------------------------------------------------
1389 # Many distributions have the custom install script, /sbin/installkernel.
1390 # If DKMS is installed, 'make install' will eventually recurse back
1391 # to this Makefile to build and install external modules.
1392 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1394 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1395 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1397 # ---------------------------------------------------------------------------
1400 ifdef CONFIG_OBJTOOL
1401 prepare: tools/objtool
1405 ifdef CONFIG_DEBUG_INFO_BTF
1406 prepare: tools/bpf/resolve_btfids
1410 PHONY += resolve_btfids_clean
1412 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1414 # tools/bpf/resolve_btfids directory might not exist
1415 # in output directory, skip its clean in that case
1416 resolve_btfids_clean:
1417 ifneq ($(wildcard $(resolve_btfids_O)),)
1418 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1421 # Clear a bunch of variables before executing the submake
1422 ifeq ($(quiet),silent_)
1427 $(Q)mkdir -p $(objtree)/tools
1428 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1431 $(Q)mkdir -p $(objtree)/tools
1432 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1434 # ---------------------------------------------------------------------------
1439 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1441 kselftest-%: headers FORCE
1442 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1444 PHONY += kselftest-merge
1446 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1447 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1448 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1449 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1451 # ---------------------------------------------------------------------------
1454 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1455 dtstree := arch/$(SRCARCH)/boot/dts
1461 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1463 %.dtbo: dtbs_prepare
1464 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1466 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1468 $(Q)$(MAKE) $(build)=$(dtstree)
1470 # include/config/kernel.release is actually needed when installing DTBs because
1471 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1472 # dtbs_install depend on it as dtbs_install may run as root.
1473 dtbs_prepare: include/config/kernel.release scripts_dtc
1475 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1479 ifneq ($(CHECK_DTBS),)
1480 dtbs_prepare: dt_binding_check
1486 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1488 ifdef CONFIG_OF_EARLY_FLATTREE
1494 PHONY += scripts_dtc
1495 scripts_dtc: scripts_basic
1496 $(Q)$(MAKE) $(build)=scripts/dtc
1498 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1499 export CHECK_DT_BINDING=y
1502 PHONY += dt_binding_check
1503 dt_binding_check: scripts_dtc
1504 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1506 PHONY += dt_compatible_check
1507 dt_compatible_check: dt_binding_check
1508 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1510 # ---------------------------------------------------------------------------
1513 ifdef CONFIG_MODULES
1515 # By default, build modules as well
1519 # When we're building modules with modversions, we need to consider
1520 # the built-in objects during the descend as well, in order to
1521 # make sure the checksums are up to date before we record them.
1522 ifdef CONFIG_MODVERSIONS
1529 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1531 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1536 modules: modules_prepare
1538 # Target to prepare building external modules
1539 modules_prepare: prepare
1540 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1542 export modules_sign_only :=
1544 ifeq ($(CONFIG_MODULE_SIG),y)
1545 PHONY += modules_sign
1546 modules_sign: modules_install
1549 # modules_sign is a subset of modules_install.
1550 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1551 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1552 modules_sign_only := y
1556 endif # CONFIG_MODULES
1559 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1560 modinst_pre := __modinst_pre
1563 modules_install: $(modinst_pre)
1564 PHONY += __modinst_pre
1566 @rm -rf $(MODLIB)/kernel
1567 @rm -f $(MODLIB)/source
1569 ifdef CONFIG_MODULES
1570 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1571 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1572 rm -f $(MODLIB)/build ; \
1573 ln -s $(CURDIR) $(MODLIB)/build ; \
1575 @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order
1577 @cp -f modules.builtin $(MODLIB)/
1578 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1581 # Cleaning is done on three levels.
1582 # make clean Delete most generated files
1583 # Leave enough to build external modules
1584 # make mrproper Delete the current configuration, and all generated files
1585 # make distclean Remove editor backup files, patch leftover files and the like
1587 # Directories & files removed with 'make clean'
1588 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1589 modules.builtin modules.builtin.modinfo modules.nsdeps \
1590 compile_commands.json .thinlto-cache rust/test rust/doc \
1591 rust-project.json .vmlinux.objs .vmlinux.export.c
1593 # Directories & files removed with 'make mrproper'
1594 MRPROPER_FILES += include/config include/generated \
1595 arch/$(SRCARCH)/include/generated .objdiff \
1596 debian snap tar-install \
1597 .config .config.old .version \
1599 certs/signing_key.pem \
1605 # clean - Delete most, but leave enough to build external modules
1607 clean: rm-files := $(CLEAN_FILES)
1609 PHONY += archclean vmlinuxclean
1612 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1613 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1615 clean: archclean vmlinuxclean resolve_btfids_clean
1617 # mrproper - Delete all generated files, including .config
1619 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1620 mrproper-dirs := $(addprefix _mrproper_,scripts)
1622 PHONY += $(mrproper-dirs) mrproper
1624 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1626 mrproper: clean $(mrproper-dirs)
1628 @find . $(RCS_FIND_IGNORE) \
1629 \( -name '*.rmeta' \) \
1630 -type f -print | xargs rm -f
1637 @find . $(RCS_FIND_IGNORE) \
1638 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1639 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1640 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1641 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1642 -type f -print | xargs rm -f
1645 # Packaging of the kernel to various formats
1646 # ---------------------------------------------------------------------------
1649 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1650 %pkg: include/config/kernel.release FORCE
1651 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1653 # Brief documentation of the typical targets used
1654 # ---------------------------------------------------------------------------
1656 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1657 boards := $(sort $(notdir $(boards)))
1658 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1659 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1663 @echo 'Cleaning targets:'
1664 @echo ' clean - Remove most generated files but keep the config and'
1665 @echo ' enough build support to build external modules'
1666 @echo ' mrproper - Remove all generated files + config + various backup files'
1667 @echo ' distclean - mrproper + remove editor backup and patch files'
1669 @echo 'Configuration targets:'
1670 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1672 @echo 'Other generic targets:'
1673 @echo ' all - Build all targets marked with [*]'
1674 @echo '* vmlinux - Build the bare kernel'
1675 @echo '* modules - Build all modules'
1676 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1677 @echo ' dir/ - Build all files in dir and below'
1678 @echo ' dir/file.[ois] - Build specified target only'
1679 @echo ' dir/file.ll - Build the LLVM assembly file'
1680 @echo ' (requires compiler support for LLVM assembly generation)'
1681 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1682 @echo ' (requires a recent binutils and recent build (System.map))'
1683 @echo ' dir/file.ko - Build module including final link'
1684 @echo ' modules_prepare - Set up for building external modules'
1685 @echo ' tags/TAGS - Generate tags file for editors'
1686 @echo ' cscope - Generate cscope index'
1687 @echo ' gtags - Generate GNU GLOBAL index'
1688 @echo ' kernelrelease - Output the release version string (use with make -s)'
1689 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1690 @echo ' image_name - Output the image name (use with make -s)'
1691 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1692 echo ' (default: $(INSTALL_HDR_PATH))'; \
1694 @echo 'Static analysers:'
1695 @echo ' checkstack - Generate a list of stack hogs'
1696 @echo ' versioncheck - Sanity check on version.h usage'
1697 @echo ' includecheck - Check for duplicate included header files'
1698 @echo ' export_report - List the usages of all exported symbols'
1699 @echo ' headerdep - Detect inclusion cycles in headers'
1700 @echo ' coccicheck - Check with Coccinelle'
1701 @echo ' clang-analyzer - Check with clang static analyzer'
1702 @echo ' clang-tidy - Check with clang-tidy'
1705 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1707 @echo 'Kernel selftest:'
1708 @echo ' kselftest - Build and run kernel selftest'
1709 @echo ' Build, install, and boot kernel before'
1710 @echo ' running kselftest on it'
1711 @echo ' Run as root for full coverage'
1712 @echo ' kselftest-all - Build kernel selftest'
1713 @echo ' kselftest-install - Build and install kernel selftest'
1714 @echo ' kselftest-clean - Remove all generated kselftest files'
1715 @echo ' kselftest-merge - Merge all the config dependencies of'
1716 @echo ' kselftest to existing .config.'
1718 @echo 'Rust targets:'
1719 @echo ' rustavailable - Checks whether the Rust toolchain is'
1720 @echo ' available and, if not, explains why.'
1721 @echo ' rustfmt - Reformat all the Rust code in the kernel'
1722 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel'
1723 @echo ' is formatted, printing a diff otherwise.'
1724 @echo ' rustdoc - Generate Rust documentation'
1725 @echo ' (requires kernel .config)'
1726 @echo ' rusttest - Runs the Rust tests'
1727 @echo ' (requires kernel .config; downloads external repos)'
1728 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1729 @echo ' (requires kernel .config)'
1730 @echo ' dir/file.[os] - Build specified target only'
1731 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1732 @echo ' Run with RUSTFMT=n to skip reformatting if needed.'
1733 @echo ' The output is not intended to be compilable.'
1734 @echo ' dir/file.ll - Build the LLVM assembly file'
1737 echo 'Devicetree:'; \
1738 echo '* dtbs - Build device tree blobs for enabled boards'; \
1739 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1740 echo ' dt_binding_check - Validate device tree binding documents'; \
1741 echo ' dtbs_check - Validate device tree source files';\
1744 @echo 'Userspace tools targets:'
1745 @echo ' use "make tools/help"'
1746 @echo ' or "cd tools; make help"'
1748 @echo 'Kernel packaging:'
1749 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1751 @echo 'Documentation targets:'
1752 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1754 @echo 'Architecture specific targets ($(SRCARCH)):'
1756 echo ' No architecture specific help defined for $(SRCARCH)')
1759 $(foreach b, $(boards), \
1760 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1762 @$(if $(board-dirs), \
1763 $(foreach b, $(board-dirs), \
1764 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1765 printf " %-16s - Show all of the above\\n" help-boards; \
1768 @echo ' make V=n [targets] 1: verbose build'
1769 @echo ' 2: give reason for rebuild of target'
1770 @echo ' V=1 and V=2 can be combined with V=12'
1771 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1772 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1773 @echo ' (sparse by default)'
1774 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1775 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1776 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1777 @echo ' 1: warnings which may be relevant and do not occur too often'
1778 @echo ' 2: warnings which occur quite often but may still be relevant'
1779 @echo ' 3: more obscure warnings, can most likely be ignored'
1780 @echo ' e: warnings are being treated as errors'
1781 @echo ' Multiple levels can be combined with W=12 or W=123'
1783 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1784 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1787 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1788 @echo 'For further info see the ./README file'
1791 help-board-dirs := $(addprefix help-,$(board-dirs))
1793 help-boards: $(help-board-dirs)
1795 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1797 $(help-board-dirs): help-%:
1798 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1799 @$(if $(boards-per-dir), \
1800 $(foreach b, $(boards-per-dir), \
1801 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1805 # Documentation targets
1806 # ---------------------------------------------------------------------------
1807 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1808 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1809 PHONY += $(DOC_TARGETS)
1811 $(Q)$(MAKE) $(build)=Documentation $@
1815 # ---------------------------------------------------------------------------
1817 # "Is Rust available?" target
1818 PHONY += rustavailable
1820 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!"
1822 # Documentation target
1824 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1827 $(Q)$(MAKE) $(build)=rust $@
1832 $(Q)$(MAKE) $(build)=rust $@
1834 # Formatting targets
1835 PHONY += rustfmt rustfmtcheck
1837 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1839 # We match using absolute paths since `find` does not resolve them
1840 # when matching, which is a problem when e.g. `srctree` is `..`.
1841 # We `grep` afterwards in order to remove the directory entry itself.
1843 $(Q)find $(abs_srctree) -type f -name '*.rs' \
1844 -o -path $(abs_srctree)/rust/alloc -prune \
1845 -o -path $(abs_objtree)/rust/test -prune \
1846 | grep -Fv $(abs_srctree)/rust/alloc \
1847 | grep -Fv $(abs_objtree)/rust/test \
1848 | grep -Fv generated \
1849 | xargs $(RUSTFMT) $(rustfmt_flags)
1851 rustfmtcheck: rustfmt_flags = --check
1852 rustfmtcheck: rustfmt
1854 # IDE support targets
1855 PHONY += rust-analyzer
1857 $(Q)$(MAKE) $(build)=rust $@
1860 # ---------------------------------------------------------------------------
1864 $(Q)$(srctree)/scripts/misc-check
1868 PHONY += scripts_gdb
1869 scripts_gdb: prepare0
1870 $(Q)$(MAKE) $(build)=scripts/gdb
1871 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1873 ifdef CONFIG_GDB_SCRIPTS
1877 else # KBUILD_EXTMOD
1879 filechk_kernel.release = echo $(KERNELRELEASE)
1882 # External module support.
1883 # When building external modules the kernel used as basis is considered
1884 # read-only, and no consistency checks are made and the make
1885 # system is not used on the basis kernel. If updates are required
1886 # in the basis kernel ordinary make commands (without M=...) must be used.
1888 # We are always building only modules.
1892 build-dir := $(KBUILD_EXTMOD)
1894 compile_commands.json: $(extmod_prefix)compile_commands.json
1895 PHONY += compile_commands.json
1897 clean-dirs := $(KBUILD_EXTMOD)
1898 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1899 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1902 # now expand this into a simple variable to reduce the cost of shell evaluations
1903 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1905 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1906 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1907 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1908 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1913 @echo ' Building external modules.'
1914 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1916 @echo ' modules - default target, build the module(s)'
1917 @echo ' modules_install - install the module'
1918 @echo ' clean - remove generated files in module directory only'
1921 __external_modules_error:
1923 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1924 @echo >&2 '*** You cannot build or install external modules.'
1928 endif # KBUILD_EXTMOD
1930 # ---------------------------------------------------------------------------
1933 PHONY += modules modules_install modules_prepare
1935 ifdef CONFIG_MODULES
1937 $(MODORDER): $(build-dir)
1940 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1941 # This is solely useful to speed up test compiles.
1943 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1944 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1947 PHONY += modules_check
1948 modules_check: $(MODORDER)
1949 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1951 quiet_cmd_depmod = DEPMOD $(MODLIB)
1952 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1956 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1959 else # CONFIG_MODULES
1961 # Modules not configured
1962 # ---------------------------------------------------------------------------
1964 PHONY += __external_modules_error
1966 modules modules_install: __external_modules_error
1971 endif # CONFIG_MODULES
1974 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1975 $(if $(KBUILD_MODULES), modules_check)
1976 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1979 # ---------------------------------------------------------------------------
1980 # To build individual files in subdirectories, you can do like this:
1982 # make foo/bar/baz.s
1984 # The supported suffixes for single-target are listed in 'single-targets'
1986 # To build only under specific subdirectories, you can do like this:
1992 # .ko is special because modpost is needed
1993 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1994 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1995 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1997 $(single-ko): single_modules
1999 $(single-no-ko): $(build-dir)
2002 # Remove MODORDER when done because it is not the real one.
2003 PHONY += single_modules
2004 single_modules: $(single-no-ko) modules_prepare
2005 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
2006 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
2007 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
2008 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
2010 $(Q)rm -f $(MODORDER)
2012 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
2018 # Preset locale variables to speed up the build process. Limit locale
2019 # tweaks to this spot to avoid wrong language settings when running
2020 # make menuconfig etc.
2021 # Error messages still appears in the original language
2022 PHONY += $(build-dir)
2023 $(build-dir): prepare
2024 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
2026 clean-dirs := $(addprefix _clean_, $(clean-dirs))
2027 PHONY += $(clean-dirs) clean
2029 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
2031 clean: $(clean-dirs)
2033 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
2034 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
2036 -o -name '*.dtb' -o -name '*.dtbo' \
2037 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
2038 -o -name '*.dt.yaml' \
2039 -o -name '*.dwo' -o -name '*.lst' \
2040 -o -name '*.su' -o -name '*.mod' \
2041 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
2042 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
2043 -o -name '*.asn1.[ch]' \
2044 -o -name '*.symtypes' -o -name 'modules.order' \
2045 -o -name '*.c.[012]*.*' \
2048 -o -name '*.*.symversions' \) -type f -print \
2049 -o -name '.tmp_*' -print \
2052 # Generate tags for editors
2053 # ---------------------------------------------------------------------------
2054 quiet_cmd_tags = GEN $@
2055 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
2057 tags TAGS cscope gtags: FORCE
2060 # Script to generate missing namespace dependencies
2061 # ---------------------------------------------------------------------------
2064 nsdeps: export KBUILD_NSDEPS=1
2066 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
2069 # ---------------------------------------------------------------------------
2071 quiet_cmd_gen_compile_commands = GEN $@
2072 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2074 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
2075 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2076 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
2077 $(call if_changed,gen_compile_commands)
2079 targets += $(extmod_prefix)compile_commands.json
2081 PHONY += clang-tidy clang-analyzer
2083 ifdef CONFIG_CC_IS_CLANG
2084 quiet_cmd_clang_tools = CHECK $<
2085 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2087 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
2088 $(call cmd,clang_tools)
2090 clang-tidy clang-analyzer:
2091 @echo "$@ requires CC=clang" >&2
2095 # Scripts to check various things for consistency
2096 # ---------------------------------------------------------------------------
2098 PHONY += includecheck versioncheck coccicheck export_report
2101 find $(srctree)/* $(RCS_FIND_IGNORE) \
2102 -name '*.[hcS]' -type f -print | sort \
2103 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2106 find $(srctree)/* $(RCS_FIND_IGNORE) \
2107 -name '*.[hcS]' -type f -print | sort \
2108 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2111 $(Q)$(BASH) $(srctree)/scripts/$@
2114 $(PERL) $(srctree)/scripts/export_report.pl
2116 PHONY += checkstack kernelrelease kernelversion image_name
2118 # UML needs a little special treatment here. It wants to use the host
2119 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2120 # else wants $(ARCH), including people doing cross-builds, which means
2121 # that $(SUBARCH) doesn't work here.
2123 CHECKSTACK_ARCH := $(SUBARCH)
2125 CHECKSTACK_ARCH := $(ARCH)
2128 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2129 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2132 @$(filechk_kernel.release)
2135 @echo $(KERNELVERSION)
2138 @echo $(KBUILD_IMAGE)
2140 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2141 cmd_rmfiles = rm -rf $(rm-files)
2143 # read saved command lines for existing targets
2144 existing-targets := $(wildcard $(sort $(targets)))
2146 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2148 endif # config-build
2150 endif # need-sub-make
2155 # Declare the contents of the PHONY variable as phony. We keep that
2156 # information in a variable so we can use it in if_changed and friends.