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 ifeq ($(abs_objtree),$(CURDIR))
195 # Suppress "Entering directory ..." unless we are changing the work directory.
196 MAKEFLAGS += --no-print-directory
201 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
202 $(error source directory cannot contain spaces or colons)
205 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
206 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
207 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
209 # Cancel implicit rules for this Makefile.
213 export sub_make_done := 1
215 ifeq ($(need-sub-make),1)
217 PHONY += $(MAKECMDGOALS) __sub-make
219 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
222 # Invoke a second make in the output directory, passing relevant variables
224 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
226 endif # need-sub-make
227 endif # sub_make_done
229 # We process the rest of the Makefile if this is the final invocation of make
230 ifeq ($(need-sub-make),)
232 # Do not print "Entering directory ...",
233 # but we want to display it when entering to the output directory
234 # so that IDEs/editors are able to understand relative filenames.
235 MAKEFLAGS += --no-print-directory
237 ifeq ($(abs_srctree),$(abs_objtree))
238 # building in the source tree
240 building_out_of_srctree :=
242 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
243 # building in a subdirectory of the source tree
246 srctree := $(abs_srctree)
248 building_out_of_srctree := 1
251 ifneq ($(KBUILD_ABS_SRCTREE),)
252 srctree := $(abs_srctree)
258 export building_out_of_srctree srctree objtree VPATH
260 # To make sure we do not include .config for any of the *config targets
261 # catch them early, and hand them over to scripts/kconfig/Makefile
262 # It is allowed to specify more targets when calling make, including
263 # mixing *config targets and build targets.
264 # For example 'make oldconfig all'.
265 # Detect when mixed targets is specified, and make a second invocation
266 # of make so .config is not included in this case either (for *config).
268 version_h := include/generated/uapi/linux/version.h
270 clean-targets := %clean mrproper cleandocs
271 no-dot-config-targets := $(clean-targets) \
272 cscope gtags TAGS tags help% %docs check% coccicheck \
273 $(version_h) headers headers_% archheaders archscripts \
274 %asm-generic kernelversion %src-pkg dt_binding_check \
275 outputmakefile rustavailable rustfmt rustfmtcheck
276 # Installation targets should not require compiler. Unfortunately, vdso_install
277 # is an exception where build artifacts may be updated. This must be fixed.
278 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
279 headers_install modules_install kernelrelease image_name
280 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
282 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
291 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
292 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
297 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
298 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
303 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
304 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
309 ifneq ($(KBUILD_EXTMOD),)
313 ifeq ($(KBUILD_EXTMOD),)
314 ifneq ($(filter %config,$(MAKECMDGOALS)),)
316 ifneq ($(words $(MAKECMDGOALS)),1)
322 # We cannot build single targets and the others at the same time
323 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
325 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
330 # For "make -j clean all", "make -j mrproper defconfig all", etc.
331 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
332 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
337 # install and modules_install need also be processed one by one
338 ifneq ($(filter install,$(MAKECMDGOALS)),)
339 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
345 # ===========================================================================
346 # We're called with mixed targets (*config and build targets).
347 # Handle them one by one.
349 PHONY += $(MAKECMDGOALS) __build_one_by_one
351 $(MAKECMDGOALS): __build_one_by_one
356 for i in $(MAKECMDGOALS); do \
357 $(MAKE) -f $(srctree)/Makefile $$i; \
362 include $(srctree)/scripts/Kbuild.include
364 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
365 KERNELRELEASE = $(call read-file, include/config/kernel.release)
366 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
367 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
369 include $(srctree)/scripts/subarch.include
371 # Cross compiling and selecting different set of gcc/bin-utils
372 # ---------------------------------------------------------------------------
374 # When performing cross compilation for other architectures ARCH shall be set
375 # to the target architecture. (See arch/* for the possibilities).
376 # ARCH can be set during invocation of make:
378 # Another way is to have ARCH set in the environment.
379 # The default ARCH is the host where make is executed.
381 # CROSS_COMPILE specify the prefix used for all executables used
382 # during compilation. Only gcc and related bin-utils executables
383 # are prefixed with $(CROSS_COMPILE).
384 # CROSS_COMPILE can be set on the command line
385 # make CROSS_COMPILE=ia64-linux-
386 # Alternatively CROSS_COMPILE can be set in the environment.
387 # Default value for CROSS_COMPILE is not to prefix executables
388 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
391 # Architecture as present in compile.h
392 UTS_MACHINE := $(ARCH)
395 # Additional ARCH settings for x86
399 ifeq ($(ARCH),x86_64)
403 # Additional ARCH settings for sparc
404 ifeq ($(ARCH),sparc32)
407 ifeq ($(ARCH),sparc64)
411 # Additional ARCH settings for parisc
412 ifeq ($(ARCH),parisc64)
416 export cross_compiling :=
417 ifneq ($(SRCARCH),$(SUBARCH))
421 KCONFIG_CONFIG ?= .config
422 export KCONFIG_CONFIG
424 # SHELL used by kbuild
427 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
428 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
429 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
432 ifneq ($(filter %/,$(LLVM)),)
433 LLVM_PREFIX := $(LLVM)
434 else ifneq ($(filter -%,$(LLVM)),)
435 LLVM_SUFFIX := $(LLVM)
438 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
439 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
445 HOSTPKG_CONFIG = pkg-config
447 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
448 -O2 -fomit-frame-pointer -std=gnu11 \
449 -Wdeclaration-after-statement
450 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
451 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
453 # These flags apply to all Rust code in the tree, including the kernel and
455 export rust_common_flags := --edition=2021 \
456 -Zbinary_dep_depinfo=y \
457 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
458 -Dunreachable_pub -Dnon_ascii_idents \
460 -Drustdoc::missing_crate_level_docs \
461 -Dclippy::correctness -Dclippy::style \
462 -Dclippy::suspicious -Dclippy::complexity \
464 -Dclippy::let_unit_value -Dclippy::mut_mut \
465 -Dclippy::needless_bitwise_bool \
466 -Dclippy::needless_continue \
469 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
470 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
471 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
472 -Zallow-features= $(HOSTRUSTFLAGS)
473 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
474 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
476 # Make variables (CC, etc...)
479 CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
480 LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
481 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
482 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
483 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
484 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
485 READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
486 STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
488 CC = $(CROSS_COMPILE)gcc
489 LD = $(CROSS_COMPILE)ld
490 AR = $(CROSS_COMPILE)ar
491 NM = $(CROSS_COMPILE)nm
492 OBJCOPY = $(CROSS_COMPILE)objcopy
493 OBJDUMP = $(CROSS_COMPILE)objdump
494 READELF = $(CROSS_COMPILE)readelf
495 STRIP = $(CROSS_COMPILE)strip
500 CLIPPY_DRIVER = clippy-driver
504 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
508 INSTALLKERNEL := installkernel
522 PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
524 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
525 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
536 # Use USERINCLUDE when you must reference the UAPI directories only.
538 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
539 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
540 -I$(srctree)/include/uapi \
541 -I$(objtree)/include/generated/uapi \
542 -include $(srctree)/include/linux/compiler-version.h \
543 -include $(srctree)/include/linux/kconfig.h
545 # Use LINUXINCLUDE when you must reference the include/ directory.
546 # Needed to be compatible with the O= option
548 -I$(srctree)/arch/$(SRCARCH)/include \
549 -I$(objtree)/arch/$(SRCARCH)/include/generated \
550 $(if $(building_out_of_srctree),-I$(srctree)/include) \
551 -I$(objtree)/include \
554 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
555 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
556 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
557 -Werror=implicit-function-declaration -Werror=implicit-int \
558 -Werror=return-type -Wno-format-security -funsigned-char \
560 KBUILD_CPPFLAGS := -D__KERNEL__
561 KBUILD_RUSTFLAGS := $(rust_common_flags) \
562 --target=$(objtree)/scripts/target.json \
563 -Cpanic=abort -Cembed-bitcode=n -Clto=n \
564 -Cforce-unwind-tables=n -Ccodegen-units=1 \
565 -Csymbol-mangling-version=v0 \
566 -Crelocation-model=static \
567 -Zfunction-sections=n \
568 -Dclippy::float_arithmetic
570 KBUILD_AFLAGS_KERNEL :=
571 KBUILD_CFLAGS_KERNEL :=
572 KBUILD_RUSTFLAGS_KERNEL :=
573 KBUILD_AFLAGS_MODULE := -DMODULE
574 KBUILD_CFLAGS_MODULE := -DMODULE
575 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
576 KBUILD_LDFLAGS_MODULE :=
580 ifeq ($(KBUILD_CLIPPY),1)
581 RUSTC_OR_CLIPPY_QUIET := CLIPPY
582 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
584 RUSTC_OR_CLIPPY_QUIET := RUSTC
585 RUSTC_OR_CLIPPY = $(RUSTC)
592 # Allows the usage of unstable features in stable compilers.
593 export RUSTC_BOOTSTRAP := 1
595 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
596 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
597 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
598 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
599 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
600 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
601 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
602 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
604 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
605 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
606 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
607 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
608 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
609 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
612 # Files to ignore in find ... statements
614 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
615 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
617 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
618 --exclude CVS --exclude .pc --exclude .hg --exclude .git
620 # ===========================================================================
621 # Rules shared between *config targets and build targets
623 # Basic helpers built in scripts/basic/
624 PHONY += scripts_basic
626 $(Q)$(MAKE) $(build)=scripts/basic
628 PHONY += outputmakefile
629 ifdef building_out_of_srctree
630 # Before starting out-of-tree build, make sure the source tree is clean.
631 # outputmakefile generates a Makefile in the output directory, if using a
632 # separate output directory. This allows convenient use of make in the
634 # At the same time when output Makefile generated, generate .gitignore to
635 # ignore whole output directory
637 quiet_cmd_makefile = GEN Makefile
639 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
640 echo "include $(srctree)/Makefile"; \
644 @if [ -f $(srctree)/.config -o \
645 -d $(srctree)/include/config -o \
646 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
648 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
649 echo >&2 "*** in $(abs_srctree)";\
653 $(Q)ln -fsn $(srctree) source
655 $(Q)test -e .gitignore || \
656 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
659 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
660 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
661 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
662 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
663 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
665 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
666 include $(srctree)/scripts/Makefile.clang
669 # Include this also for config targets because some architectures need
670 # cc-cross-prefix to determine CROSS_COMPILE.
672 include $(srctree)/scripts/Makefile.compiler
676 # ===========================================================================
677 # *config targets only - make sure prerequisites are updated, and descend
678 # in scripts/kconfig to make the *config target
680 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
681 # KBUILD_DEFCONFIG may point out an alternative default configuration
682 # used for 'make defconfig'
683 include $(srctree)/arch/$(SRCARCH)/Makefile
684 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
686 config: outputmakefile scripts_basic FORCE
687 $(Q)$(MAKE) $(build)=scripts/kconfig $@
689 %config: outputmakefile scripts_basic FORCE
690 $(Q)$(MAKE) $(build)=scripts/kconfig $@
693 # ===========================================================================
694 # Build targets only - this includes vmlinux, arch specific targets, clean
695 # targets and others. In general all targets except *config targets.
697 # If building an external module we do not care about the all: rule
698 # but instead __all depend on modules
700 ifeq ($(KBUILD_EXTMOD),)
708 # Decide whether to build built-in, modular, or both.
709 # Normally, just do built-in.
714 # If we have only "make modules", don't compile built-in objects.
715 ifeq ($(MAKECMDGOALS),modules)
719 # If we have "make <whatever> modules", compile modules
720 # in addition to whatever we do anyway.
721 # Just "make" or "make all" shall build modules as well
723 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
727 ifeq ($(MAKECMDGOALS),)
731 export KBUILD_MODULES KBUILD_BUILTIN
734 include include/config/auto.conf
737 ifeq ($(KBUILD_EXTMOD),)
738 # Objects we will link into vmlinux / subdirs we need to visit
742 endif # KBUILD_EXTMOD
744 # The all: target is the default when no target is given on the
746 # This allow a user to issue only 'make' to build a kernel including modules
747 # Defaults to vmlinux, but the arch makefile usually adds further targets
750 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
751 ifdef CONFIG_CC_IS_GCC
752 CFLAGS_GCOV += -fno-tree-loop-im
756 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
757 ifdef CONFIG_FUNCTION_TRACER
758 CC_FLAGS_FTRACE := -pg
761 include $(srctree)/arch/$(SRCARCH)/Makefile
764 ifdef may-sync-config
765 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
766 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
767 # because some architectures define CROSS_COMPILE there.
768 include include/config/auto.conf.cmd
772 @echo >&2 '*** Configuration file "$@" not found!'
774 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
775 @echo >&2 '*** "make menuconfig" or "make xconfig").'
779 # The actual configuration files used during the build are stored in
780 # include/generated/ and include/config/. Update them if .config is newer than
781 # include/config/auto.conf (which mirrors .config).
783 # This exploits the 'multi-target pattern rule' trick.
784 # The syncconfig should be executed only once to make all the targets.
785 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
787 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
788 # so you cannot notice that Kconfig is waiting for the user input.
789 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
790 $(Q)$(kecho) " SYNC $@"
791 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
792 else # !may-sync-config
793 # External modules and some install targets need include/generated/autoconf.h
794 # and include/config/auto.conf but do not care if they are up-to-date.
795 # Use auto.conf to trigger the test
796 PHONY += include/config/auto.conf
798 include/config/auto.conf:
799 @test -e include/generated/autoconf.h -a -e $@ || ( \
801 echo >&2 " ERROR: Kernel configuration is invalid."; \
802 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
803 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
807 endif # may-sync-config
810 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
811 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
812 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
813 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
814 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
816 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
818 KBUILD_RUSTFLAGS += -Copt-level=2
819 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
821 KBUILD_RUSTFLAGS += -Copt-level=s
824 # Always set `debug-assertions` and `overflow-checks` because their default
825 # depends on `opt-level` and `debug-assertions`, respectively.
826 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
827 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
829 # Tell gcc to never replace conditional load with a non-conditional one
830 ifdef CONFIG_CC_IS_GCC
831 # gcc-10 renamed --param=allow-store-data-races=0 to
832 # -fno-allow-store-data-races.
833 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
834 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
837 ifdef CONFIG_READABLE_ASM
838 # Disable optimizations that make assembler listings hard to read.
839 # reorder blocks reorders the control in the function
840 # ipa clone creates specialized cloned functions
841 # partial inlining inlines only parts of functions
842 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
845 ifneq ($(CONFIG_FRAME_WARN),0)
846 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
849 stackp-flags-y := -fno-stack-protector
850 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
851 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
853 KBUILD_CFLAGS += $(stackp-flags-y)
855 KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
856 KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
857 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
859 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
860 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
862 ifdef CONFIG_CC_IS_CLANG
863 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
864 KBUILD_CFLAGS += -Wno-gnu
867 # gcc inanely warns about local variables called 'main'
868 KBUILD_CFLAGS += -Wno-main
871 # These warnings generated too much noise in a regular build.
872 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
873 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
874 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
876 # These result in bogus false positives
877 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
879 ifdef CONFIG_FRAME_POINTER
880 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
881 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
883 # Some targets (ARM with Thumb2, for example), can't be built with frame
884 # pointers. For those, we don't have FUNCTION_TRACER automatically
885 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
886 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
887 # -fomit-frame-pointer with FUNCTION_TRACER.
888 # In the Rust target specification, "frame-pointer" is set explicitly
890 ifndef CONFIG_FUNCTION_TRACER
891 KBUILD_CFLAGS += -fomit-frame-pointer
895 # Initialize all stack variables with a 0xAA pattern.
896 ifdef CONFIG_INIT_STACK_ALL_PATTERN
897 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
900 # Initialize all stack variables with a zero value.
901 ifdef CONFIG_INIT_STACK_ALL_ZERO
902 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
903 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
904 # https://github.com/llvm/llvm-project/issues/44842
905 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
906 export CC_AUTO_VAR_INIT_ZERO_ENABLER
907 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
911 # While VLAs have been removed, GCC produces unreachable stack probes
912 # for the randomize_kstack_offset feature. Disable it for all compilers.
913 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
915 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
916 ifdef CONFIG_ZERO_CALL_USED_REGS
917 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
920 ifdef CONFIG_FUNCTION_TRACER
921 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
922 CC_FLAGS_FTRACE += -mrecord-mcount
923 ifdef CONFIG_HAVE_NOP_MCOUNT
924 ifeq ($(call cc-option-yn, -mnop-mcount),y)
925 CC_FLAGS_FTRACE += -mnop-mcount
926 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
930 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
931 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
932 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
935 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
936 ifdef CONFIG_HAVE_C_RECORDMCOUNT
937 BUILD_C_RECORDMCOUNT := y
938 export BUILD_C_RECORDMCOUNT
941 ifdef CONFIG_HAVE_FENTRY
942 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
943 ifeq ($(call cc-option-yn, -mfentry),y)
944 CC_FLAGS_FTRACE += -mfentry
945 CC_FLAGS_USING += -DCC_USING_FENTRY
948 export CC_FLAGS_FTRACE
949 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
950 KBUILD_AFLAGS += $(CC_FLAGS_USING)
953 # We trigger additional mismatches with less inlining
954 ifdef CONFIG_DEBUG_SECTION_MISMATCH
955 KBUILD_CFLAGS += -fno-inline-functions-called-once
958 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
959 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
960 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
961 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
962 LDFLAGS_vmlinux += --gc-sections
965 ifdef CONFIG_SHADOW_CALL_STACK
966 ifndef CONFIG_DYNAMIC_SCS
967 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
968 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
973 ifdef CONFIG_LTO_CLANG
974 ifdef CONFIG_LTO_CLANG_THIN
975 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
976 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
978 CC_FLAGS_LTO := -flto
980 CC_FLAGS_LTO += -fvisibility=hidden
982 # Limit inlining across translation units to reduce binary size
983 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
985 # Check for frame size exceeding threshold during prolog/epilog insertion
986 # when using lld < 13.0.0.
987 ifneq ($(CONFIG_FRAME_WARN),0)
988 ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y)
989 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
995 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
996 KBUILD_AFLAGS += -fno-lto
1000 ifdef CONFIG_CFI_CLANG
1001 CC_FLAGS_CFI := -fsanitize=kcfi
1002 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
1006 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
1007 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
1010 # arch Makefile may override CC so keep this after arch Makefile is included
1011 NOSTDINC_FLAGS += -nostdinc
1013 # warn about C99 declaration after statement
1014 KBUILD_CFLAGS += -Wdeclaration-after-statement
1016 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1017 KBUILD_CFLAGS += -Wvla
1019 # disable pointer signed / unsigned warnings in gcc 4.0
1020 KBUILD_CFLAGS += -Wno-pointer-sign
1022 # In order to make sure new function cast mismatches are not introduced
1023 # in the kernel (to avoid tripping CFI checking), the kernel should be
1024 # globally built with -Wcast-function-type.
1025 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
1027 # disable stringop warnings in gcc 8+
1028 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
1030 # We'll want to enable this eventually, but it's not going away for 5.7 at least
1031 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
1033 # Another good warning that we'll want to enable eventually
1034 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1036 # Enabled with W=2, disabled by default as noisy
1037 ifdef CONFIG_CC_IS_GCC
1038 KBUILD_CFLAGS += -Wno-maybe-uninitialized
1041 # The allocators already balk at large sizes, so silence the compiler
1042 # warnings for bounds checks involving those possible values. While
1043 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
1044 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
1045 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1046 # doesn't work (as it is documented to), silently resolving to "0" prior to
1047 # version 9.1 (and producing an error more recently). Numeric values larger
1048 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1049 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1050 # choice, we must perform a versioned check to disable this warning.
1052 KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
1053 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
1055 # disable invalid "can't wrap" optimizations for signed / pointers
1056 KBUILD_CFLAGS += -fno-strict-overflow
1058 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1059 KBUILD_CFLAGS += -fno-stack-check
1061 # conserve stack if available
1062 ifdef CONFIG_CC_IS_GCC
1063 KBUILD_CFLAGS += -fconserve-stack
1066 # Prohibit date/time macros, which would make the build non-deterministic
1067 KBUILD_CFLAGS += -Werror=date-time
1069 # enforce correct pointer usage
1070 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
1072 # Require designated initializers for all marked structures
1073 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1075 # change __FILE__ to the relative path from the srctree
1076 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1078 # include additional Makefiles when needed
1079 include-y := scripts/Makefile.extrawarn
1080 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1081 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1082 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1083 include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan
1084 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1085 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1086 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct
1087 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1089 include $(addprefix $(srctree)/, $(include-y))
1091 # scripts/Makefile.gcc-plugins is intentionally included last.
1092 # Do not add $(call cc-option,...) below this line. When you build the kernel
1093 # from the clean source tree, the GCC plugins do not exist at this point.
1095 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1096 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1097 KBUILD_AFLAGS += $(KAFLAGS)
1098 KBUILD_CFLAGS += $(KCFLAGS)
1099 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1101 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1102 LDFLAGS_vmlinux += --build-id=sha1
1104 KBUILD_LDFLAGS += -z noexecstack
1105 ifeq ($(CONFIG_LD_IS_BFD),y)
1106 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
1109 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1110 LDFLAGS_vmlinux += -X
1113 ifeq ($(CONFIG_RELR),y)
1114 # ld.lld before 15 did not support -z pack-relative-relocs.
1115 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1118 # We never want expected sections to be placed heuristically by the
1119 # linker. All sections should be explicitly named in the linker script.
1120 ifdef CONFIG_LD_ORPHAN_WARN
1121 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1124 # Align the bit size of userspace programs with the kernel
1125 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1126 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1128 # make the checker run with the right architecture
1129 CHECKFLAGS += --arch=$(ARCH)
1131 # insure the checker run with the right endianness
1132 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1134 # the checker needs the correct machine size
1135 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1137 # Default kernel image to build when no specific target is given.
1138 # KBUILD_IMAGE may be overruled on the command line or
1139 # set in the environment
1140 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1141 # this default value
1142 export KBUILD_IMAGE ?= vmlinux
1145 # INSTALL_PATH specifies where to place the updated kernel and system map
1146 # images. Default is /boot, but you can set it to other values
1147 export INSTALL_PATH ?= /boot
1150 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1151 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1152 # an argument if needed. Otherwise it defaults to the kernel install path
1154 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1157 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1158 # relocations required by build roots. This is not defined in the
1159 # makefile but the argument can be passed to make if needed.
1162 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1167 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1168 export MODORDER := $(extmod_prefix)modules.order
1169 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1171 ifeq ($(KBUILD_EXTMOD),)
1174 clean-dirs := $(sort . Documentation \
1175 $(patsubst %/,%,$(filter %/, $(core-) \
1176 $(drivers-) $(libs-))))
1178 export ARCH_CORE := $(core-y)
1179 export ARCH_LIB := $(filter %/, $(libs-y))
1180 export ARCH_DRIVERS := $(drivers-y) $(drivers-m)
1181 # Externally visible symbols (used by link-vmlinux.sh)
1183 KBUILD_VMLINUX_OBJS := ./built-in.a
1184 ifdef CONFIG_MODULES
1185 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1186 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1188 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1191 export KBUILD_VMLINUX_LIBS
1192 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1194 ifdef CONFIG_TRIM_UNUSED_KSYMS
1195 # For the kernel to actually contain only the needed exported symbols,
1196 # we have to build modules as well to determine what those symbols are.
1200 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1201 quiet_cmd_ar_vmlinux.a = AR $@
1202 cmd_ar_vmlinux.a = \
1204 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1205 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1207 targets += vmlinux.a
1208 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1209 $(call if_changed,ar_vmlinux.a)
1212 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1213 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1215 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1219 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1220 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1221 # unrelated; the decompressors just happen to have the same base name,
1222 # arch/*/boot/compressed/vmlinux.
1223 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1225 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1226 # https://savannah.gnu.org/bugs/?61463
1227 # For Make > 4.4, the following simple code will work:
1228 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1229 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1230 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1231 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1232 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1234 # The actual objects are generated when descending,
1235 # make sure no implicit rule kicks in
1236 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1238 ifeq ($(origin KERNELRELEASE),file)
1239 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1241 filechk_kernel.release = echo $(KERNELRELEASE)
1244 # Store (new) KERNELRELEASE string in include/config/kernel.release
1245 include/config/kernel.release: FORCE
1246 $(call filechk,kernel.release)
1248 # Additional helpers built in scripts/
1249 # Carefully list dependencies so we do not try to build scripts twice
1252 scripts: scripts_basic scripts_dtc
1253 $(Q)$(MAKE) $(build)=$(@)
1255 # Things we need to do before we recursively start building the kernel
1256 # or the modules are listed in "prepare".
1257 # A multi level approach is used. prepareN is processed before prepareN-1.
1258 # archprepare is used in arch Makefiles and when processed asm symlink,
1259 # version.h and scripts_basic is processed / created.
1261 PHONY += prepare archprepare
1263 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1264 asm-generic $(version_h) include/generated/utsrelease.h \
1265 include/generated/compile.h include/generated/autoconf.h remove-stale-files
1267 prepare0: archprepare
1268 $(Q)$(MAKE) $(build)=scripts/mod
1269 $(Q)$(MAKE) $(build)=. prepare
1271 # All the preparing..
1274 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v
1275 $(Q)$(MAKE) $(build)=rust
1278 PHONY += remove-stale-files
1280 $(Q)$(srctree)/scripts/remove-stale-files
1282 # Support for using generic headers in asm-generic
1283 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1285 PHONY += asm-generic uapi-asm-generic
1286 asm-generic: uapi-asm-generic
1287 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1288 generic=include/asm-generic
1290 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1291 generic=include/uapi/asm-generic
1293 # Generate some files
1294 # ---------------------------------------------------------------------------
1296 # KERNELRELEASE can change from a few different places, meaning version.h
1297 # needs to be updated, so this check is forced on all builds
1300 define filechk_utsrelease.h
1301 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1302 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1305 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1308 define filechk_version.h
1309 if [ $(SUBLEVEL) -gt 255 ]; then \
1310 echo \#define LINUX_VERSION_CODE $(shell \
1311 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1313 echo \#define LINUX_VERSION_CODE $(shell \
1314 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1316 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1317 ((c) > 255 ? 255 : (c)))'; \
1318 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1319 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1320 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1323 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1324 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1326 $(call filechk,version.h)
1328 include/generated/utsrelease.h: include/config/kernel.release FORCE
1329 $(call filechk,utsrelease.h)
1331 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1332 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1334 include/generated/compile.h: FORCE
1335 $(call filechk,compile.h)
1339 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1340 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1342 # ---------------------------------------------------------------------------
1345 #Default location for installed headers
1346 export INSTALL_HDR_PATH = $(objtree)/usr
1348 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1349 cmd_headers_install = \
1350 mkdir -p $(INSTALL_HDR_PATH); \
1351 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1352 usr/include $(INSTALL_HDR_PATH)
1354 PHONY += headers_install
1355 headers_install: headers
1356 $(call cmd,headers_install)
1358 PHONY += archheaders archscripts
1360 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1363 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1364 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1365 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1366 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1368 ifdef CONFIG_HEADERS_INSTALL
1372 PHONY += scripts_unifdef
1373 scripts_unifdef: scripts_basic
1374 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1376 # ---------------------------------------------------------------------------
1379 # Many distributions have the custom install script, /sbin/installkernel.
1380 # If DKMS is installed, 'make install' will eventually recurse back
1381 # to this Makefile to build and install external modules.
1382 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1384 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1385 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1387 # ---------------------------------------------------------------------------
1390 ifdef CONFIG_OBJTOOL
1391 prepare: tools/objtool
1395 ifdef CONFIG_DEBUG_INFO_BTF
1396 prepare: tools/bpf/resolve_btfids
1400 PHONY += resolve_btfids_clean
1402 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1404 # tools/bpf/resolve_btfids directory might not exist
1405 # in output directory, skip its clean in that case
1406 resolve_btfids_clean:
1407 ifneq ($(wildcard $(resolve_btfids_O)),)
1408 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1411 # Clear a bunch of variables before executing the submake
1412 ifeq ($(quiet),silent_)
1417 $(Q)mkdir -p $(objtree)/tools
1418 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1421 $(Q)mkdir -p $(objtree)/tools
1422 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1424 # ---------------------------------------------------------------------------
1429 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1431 kselftest-%: headers FORCE
1432 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1434 PHONY += kselftest-merge
1436 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1437 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1438 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1439 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1441 # ---------------------------------------------------------------------------
1444 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1445 dtstree := arch/$(SRCARCH)/boot/dts
1451 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1453 %.dtbo: dtbs_prepare
1454 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1456 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1458 $(Q)$(MAKE) $(build)=$(dtstree)
1460 # include/config/kernel.release is actually needed when installing DTBs because
1461 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1462 # dtbs_install depend on it as dtbs_install may run as root.
1463 dtbs_prepare: include/config/kernel.release scripts_dtc
1465 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1469 ifneq ($(CHECK_DTBS),)
1470 dtbs_prepare: dt_binding_check
1476 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1478 ifdef CONFIG_OF_EARLY_FLATTREE
1484 PHONY += scripts_dtc
1485 scripts_dtc: scripts_basic
1486 $(Q)$(MAKE) $(build)=scripts/dtc
1488 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1489 export CHECK_DT_BINDING=y
1492 PHONY += dt_binding_check
1493 dt_binding_check: scripts_dtc
1494 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1496 PHONY += dt_compatible_check
1497 dt_compatible_check: dt_binding_check
1498 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1500 # ---------------------------------------------------------------------------
1503 ifdef CONFIG_MODULES
1505 # By default, build modules as well
1509 # When we're building modules with modversions, we need to consider
1510 # the built-in objects during the descend as well, in order to
1511 # make sure the checksums are up to date before we record them.
1512 ifdef CONFIG_MODVERSIONS
1519 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1521 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1526 modules: modules_prepare
1528 # Target to prepare building external modules
1529 modules_prepare: prepare
1530 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1532 export modules_sign_only :=
1534 ifeq ($(CONFIG_MODULE_SIG),y)
1535 PHONY += modules_sign
1536 modules_sign: modules_install
1539 # modules_sign is a subset of modules_install.
1540 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1541 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1542 modules_sign_only := y
1546 endif # CONFIG_MODULES
1549 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1550 modinst_pre := __modinst_pre
1553 modules_install: $(modinst_pre)
1554 PHONY += __modinst_pre
1556 @rm -rf $(MODLIB)/kernel
1557 @rm -f $(MODLIB)/source
1559 ifdef CONFIG_MODULES
1560 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1561 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1562 rm -f $(MODLIB)/build ; \
1563 ln -s $(CURDIR) $(MODLIB)/build ; \
1565 @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order
1567 @cp -f modules.builtin $(MODLIB)/
1568 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1571 # Cleaning is done on three levels.
1572 # make clean Delete most generated files
1573 # Leave enough to build external modules
1574 # make mrproper Delete the current configuration, and all generated files
1575 # make distclean Remove editor backup files, patch leftover files and the like
1577 # Directories & files removed with 'make clean'
1578 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1579 modules.builtin modules.builtin.modinfo modules.nsdeps \
1580 compile_commands.json .thinlto-cache rust/test rust/doc \
1581 rust-project.json .vmlinux.objs .vmlinux.export.c
1583 # Directories & files removed with 'make mrproper'
1584 MRPROPER_FILES += include/config include/generated \
1585 arch/$(SRCARCH)/include/generated .objdiff \
1586 debian snap tar-install \
1587 .config .config.old .version \
1589 certs/signing_key.pem \
1595 # clean - Delete most, but leave enough to build external modules
1597 clean: rm-files := $(CLEAN_FILES)
1599 PHONY += archclean vmlinuxclean
1602 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1603 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1605 clean: archclean vmlinuxclean resolve_btfids_clean
1607 # mrproper - Delete all generated files, including .config
1609 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1610 mrproper-dirs := $(addprefix _mrproper_,scripts)
1612 PHONY += $(mrproper-dirs) mrproper
1614 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1616 mrproper: clean $(mrproper-dirs)
1618 @find . $(RCS_FIND_IGNORE) \
1619 \( -name '*.rmeta' \) \
1620 -type f -print | xargs rm -f
1627 @find . $(RCS_FIND_IGNORE) \
1628 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1629 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1630 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1631 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1632 -type f -print | xargs rm -f
1635 # Packaging of the kernel to various formats
1636 # ---------------------------------------------------------------------------
1639 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1640 %pkg: include/config/kernel.release FORCE
1641 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1643 # Brief documentation of the typical targets used
1644 # ---------------------------------------------------------------------------
1646 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1647 boards := $(sort $(notdir $(boards)))
1648 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1649 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1653 @echo 'Cleaning targets:'
1654 @echo ' clean - Remove most generated files but keep the config and'
1655 @echo ' enough build support to build external modules'
1656 @echo ' mrproper - Remove all generated files + config + various backup files'
1657 @echo ' distclean - mrproper + remove editor backup and patch files'
1659 @echo 'Configuration targets:'
1660 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1662 @echo 'Other generic targets:'
1663 @echo ' all - Build all targets marked with [*]'
1664 @echo '* vmlinux - Build the bare kernel'
1665 @echo '* modules - Build all modules'
1666 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1667 @echo ' dir/ - Build all files in dir and below'
1668 @echo ' dir/file.[ois] - Build specified target only'
1669 @echo ' dir/file.ll - Build the LLVM assembly file'
1670 @echo ' (requires compiler support for LLVM assembly generation)'
1671 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1672 @echo ' (requires a recent binutils and recent build (System.map))'
1673 @echo ' dir/file.ko - Build module including final link'
1674 @echo ' modules_prepare - Set up for building external modules'
1675 @echo ' tags/TAGS - Generate tags file for editors'
1676 @echo ' cscope - Generate cscope index'
1677 @echo ' gtags - Generate GNU GLOBAL index'
1678 @echo ' kernelrelease - Output the release version string (use with make -s)'
1679 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1680 @echo ' image_name - Output the image name (use with make -s)'
1681 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1682 echo ' (default: $(INSTALL_HDR_PATH))'; \
1684 @echo 'Static analysers:'
1685 @echo ' checkstack - Generate a list of stack hogs'
1686 @echo ' versioncheck - Sanity check on version.h usage'
1687 @echo ' includecheck - Check for duplicate included header files'
1688 @echo ' export_report - List the usages of all exported symbols'
1689 @echo ' headerdep - Detect inclusion cycles in headers'
1690 @echo ' coccicheck - Check with Coccinelle'
1691 @echo ' clang-analyzer - Check with clang static analyzer'
1692 @echo ' clang-tidy - Check with clang-tidy'
1695 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1697 @echo 'Kernel selftest:'
1698 @echo ' kselftest - Build and run kernel selftest'
1699 @echo ' Build, install, and boot kernel before'
1700 @echo ' running kselftest on it'
1701 @echo ' Run as root for full coverage'
1702 @echo ' kselftest-all - Build kernel selftest'
1703 @echo ' kselftest-install - Build and install kernel selftest'
1704 @echo ' kselftest-clean - Remove all generated kselftest files'
1705 @echo ' kselftest-merge - Merge all the config dependencies of'
1706 @echo ' kselftest to existing .config.'
1708 @echo 'Rust targets:'
1709 @echo ' rustavailable - Checks whether the Rust toolchain is'
1710 @echo ' available and, if not, explains why.'
1711 @echo ' rustfmt - Reformat all the Rust code in the kernel'
1712 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel'
1713 @echo ' is formatted, printing a diff otherwise.'
1714 @echo ' rustdoc - Generate Rust documentation'
1715 @echo ' (requires kernel .config)'
1716 @echo ' rusttest - Runs the Rust tests'
1717 @echo ' (requires kernel .config; downloads external repos)'
1718 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1719 @echo ' (requires kernel .config)'
1720 @echo ' dir/file.[os] - Build specified target only'
1721 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1722 @echo ' Run with RUSTFMT=n to skip reformatting if needed.'
1723 @echo ' The output is not intended to be compilable.'
1724 @echo ' dir/file.ll - Build the LLVM assembly file'
1727 echo 'Devicetree:'; \
1728 echo '* dtbs - Build device tree blobs for enabled boards'; \
1729 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1730 echo ' dt_binding_check - Validate device tree binding documents'; \
1731 echo ' dtbs_check - Validate device tree source files';\
1734 @echo 'Userspace tools targets:'
1735 @echo ' use "make tools/help"'
1736 @echo ' or "cd tools; make help"'
1738 @echo 'Kernel packaging:'
1739 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1741 @echo 'Documentation targets:'
1742 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1744 @echo 'Architecture specific targets ($(SRCARCH)):'
1746 echo ' No architecture specific help defined for $(SRCARCH)')
1749 $(foreach b, $(boards), \
1750 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1752 @$(if $(board-dirs), \
1753 $(foreach b, $(board-dirs), \
1754 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1755 printf " %-16s - Show all of the above\\n" help-boards; \
1758 @echo ' make V=n [targets] 1: verbose build'
1759 @echo ' 2: give reason for rebuild of target'
1760 @echo ' V=1 and V=2 can be combined with V=12'
1761 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1762 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1763 @echo ' (sparse by default)'
1764 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1765 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1766 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1767 @echo ' 1: warnings which may be relevant and do not occur too often'
1768 @echo ' 2: warnings which occur quite often but may still be relevant'
1769 @echo ' 3: more obscure warnings, can most likely be ignored'
1770 @echo ' e: warnings are being treated as errors'
1771 @echo ' Multiple levels can be combined with W=12 or W=123'
1773 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1774 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1777 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1778 @echo 'For further info see the ./README file'
1781 help-board-dirs := $(addprefix help-,$(board-dirs))
1783 help-boards: $(help-board-dirs)
1785 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1787 $(help-board-dirs): help-%:
1788 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1789 @$(if $(boards-per-dir), \
1790 $(foreach b, $(boards-per-dir), \
1791 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1795 # Documentation targets
1796 # ---------------------------------------------------------------------------
1797 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1798 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1799 PHONY += $(DOC_TARGETS)
1801 $(Q)$(MAKE) $(build)=Documentation $@
1805 # ---------------------------------------------------------------------------
1807 # "Is Rust available?" target
1808 PHONY += rustavailable
1810 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!"
1812 # Documentation target
1814 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1817 $(Q)$(MAKE) $(build)=rust $@
1822 $(Q)$(MAKE) $(build)=rust $@
1824 # Formatting targets
1825 PHONY += rustfmt rustfmtcheck
1827 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1829 # We match using absolute paths since `find` does not resolve them
1830 # when matching, which is a problem when e.g. `srctree` is `..`.
1831 # We `grep` afterwards in order to remove the directory entry itself.
1833 $(Q)find $(abs_srctree) -type f -name '*.rs' \
1834 -o -path $(abs_srctree)/rust/alloc -prune \
1835 -o -path $(abs_objtree)/rust/test -prune \
1836 | grep -Fv $(abs_srctree)/rust/alloc \
1837 | grep -Fv $(abs_objtree)/rust/test \
1838 | grep -Fv generated \
1839 | xargs $(RUSTFMT) $(rustfmt_flags)
1841 rustfmtcheck: rustfmt_flags = --check
1842 rustfmtcheck: rustfmt
1844 # IDE support targets
1845 PHONY += rust-analyzer
1847 $(Q)$(MAKE) $(build)=rust $@
1850 # ---------------------------------------------------------------------------
1854 $(Q)$(srctree)/scripts/misc-check
1858 PHONY += scripts_gdb
1859 scripts_gdb: prepare0
1860 $(Q)$(MAKE) $(build)=scripts/gdb
1861 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1863 ifdef CONFIG_GDB_SCRIPTS
1867 else # KBUILD_EXTMOD
1869 filechk_kernel.release = echo $(KERNELRELEASE)
1872 # External module support.
1873 # When building external modules the kernel used as basis is considered
1874 # read-only, and no consistency checks are made and the make
1875 # system is not used on the basis kernel. If updates are required
1876 # in the basis kernel ordinary make commands (without M=...) must be used.
1878 # We are always building only modules.
1882 build-dir := $(KBUILD_EXTMOD)
1884 compile_commands.json: $(extmod_prefix)compile_commands.json
1885 PHONY += compile_commands.json
1887 clean-dirs := $(KBUILD_EXTMOD)
1888 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1889 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1892 # now expand this into a simple variable to reduce the cost of shell evaluations
1893 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1895 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1896 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1897 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1898 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1903 @echo ' Building external modules.'
1904 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1906 @echo ' modules - default target, build the module(s)'
1907 @echo ' modules_install - install the module'
1908 @echo ' clean - remove generated files in module directory only'
1911 __external_modules_error:
1913 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1914 @echo >&2 '*** You cannot build or install external modules.'
1918 endif # KBUILD_EXTMOD
1920 # ---------------------------------------------------------------------------
1923 PHONY += modules modules_install modules_prepare
1925 ifdef CONFIG_MODULES
1927 $(MODORDER): $(build-dir)
1930 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1931 # This is solely useful to speed up test compiles.
1933 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1934 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1937 PHONY += modules_check
1938 modules_check: $(MODORDER)
1939 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1941 quiet_cmd_depmod = DEPMOD $(MODLIB)
1942 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1946 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1949 else # CONFIG_MODULES
1951 # Modules not configured
1952 # ---------------------------------------------------------------------------
1954 PHONY += __external_modules_error
1956 modules modules_install: __external_modules_error
1961 endif # CONFIG_MODULES
1964 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1965 $(if $(KBUILD_MODULES), modules_check)
1966 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1969 # ---------------------------------------------------------------------------
1970 # To build individual files in subdirectories, you can do like this:
1972 # make foo/bar/baz.s
1974 # The supported suffixes for single-target are listed in 'single-targets'
1976 # To build only under specific subdirectories, you can do like this:
1982 # .ko is special because modpost is needed
1983 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1984 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1985 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1987 $(single-ko): single_modules
1989 $(single-no-ko): $(build-dir)
1992 # Remove MODORDER when done because it is not the real one.
1993 PHONY += single_modules
1994 single_modules: $(single-no-ko) modules_prepare
1995 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
1996 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1997 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1998 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
2000 $(Q)rm -f $(MODORDER)
2002 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
2008 # Preset locale variables to speed up the build process. Limit locale
2009 # tweaks to this spot to avoid wrong language settings when running
2010 # make menuconfig etc.
2011 # Error messages still appears in the original language
2012 PHONY += $(build-dir)
2013 $(build-dir): prepare
2014 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
2016 clean-dirs := $(addprefix _clean_, $(clean-dirs))
2017 PHONY += $(clean-dirs) clean
2019 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
2021 clean: $(clean-dirs)
2023 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
2024 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
2026 -o -name '*.dtb' -o -name '*.dtbo' \
2027 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
2028 -o -name '*.dt.yaml' \
2029 -o -name '*.dwo' -o -name '*.lst' \
2030 -o -name '*.su' -o -name '*.mod' \
2031 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
2032 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
2033 -o -name '*.asn1.[ch]' \
2034 -o -name '*.symtypes' -o -name 'modules.order' \
2035 -o -name '*.c.[012]*.*' \
2038 -o -name '*.*.symversions' \) -type f -print \
2039 -o -name '.tmp_*' -print \
2042 # Generate tags for editors
2043 # ---------------------------------------------------------------------------
2044 quiet_cmd_tags = GEN $@
2045 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
2047 tags TAGS cscope gtags: FORCE
2050 # Script to generate missing namespace dependencies
2051 # ---------------------------------------------------------------------------
2054 nsdeps: export KBUILD_NSDEPS=1
2056 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
2059 # ---------------------------------------------------------------------------
2061 quiet_cmd_gen_compile_commands = GEN $@
2062 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2064 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
2065 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2066 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
2067 $(call if_changed,gen_compile_commands)
2069 targets += $(extmod_prefix)compile_commands.json
2071 PHONY += clang-tidy clang-analyzer
2073 ifdef CONFIG_CC_IS_CLANG
2074 quiet_cmd_clang_tools = CHECK $<
2075 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2077 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
2078 $(call cmd,clang_tools)
2080 clang-tidy clang-analyzer:
2081 @echo "$@ requires CC=clang" >&2
2085 # Scripts to check various things for consistency
2086 # ---------------------------------------------------------------------------
2088 PHONY += includecheck versioncheck coccicheck export_report
2091 find $(srctree)/* $(RCS_FIND_IGNORE) \
2092 -name '*.[hcS]' -type f -print | sort \
2093 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2096 find $(srctree)/* $(RCS_FIND_IGNORE) \
2097 -name '*.[hcS]' -type f -print | sort \
2098 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2101 $(Q)$(BASH) $(srctree)/scripts/$@
2104 $(PERL) $(srctree)/scripts/export_report.pl
2106 PHONY += checkstack kernelrelease kernelversion image_name
2108 # UML needs a little special treatment here. It wants to use the host
2109 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2110 # else wants $(ARCH), including people doing cross-builds, which means
2111 # that $(SUBARCH) doesn't work here.
2113 CHECKSTACK_ARCH := $(SUBARCH)
2115 CHECKSTACK_ARCH := $(ARCH)
2118 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2119 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2122 @$(filechk_kernel.release)
2125 @echo $(KERNELVERSION)
2128 @echo $(KBUILD_IMAGE)
2130 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2131 cmd_rmfiles = rm -rf $(rm-files)
2133 # read saved command lines for existing targets
2134 existing-targets := $(wildcard $(sort $(targets)))
2136 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2138 endif # config-build
2140 endif # need-sub-make
2145 # Declare the contents of the PHONY variable as phony. We keep that
2146 # information in a variable so we can use it in if_changed and friends.