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 $(error targets prefixed with '__' are only for internal use))
21 # That's our default target when none is given on the command line
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.a targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 ifneq ($(sub_make_done),1)
43 # Do not use make's built-in rules and variables
44 # (this increases performance and avoids hard-to-debug behaviour)
47 # Avoid funny character set dependencies
51 export LC_COLLATE LC_NUMERIC
53 # Avoid interference with shell env settings
57 # ---------------------------------------------------------------------------
59 # Normally, we echo the whole command before executing it. By making
60 # that echo $($(quiet)$(cmd)), we now have the possibility to set
61 # $(quiet) to choose other forms of output instead, e.g.
63 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
64 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
66 # If $(quiet) is empty, the whole command will be printed.
67 # If it is set to "quiet_", only the short version will be printed.
68 # If it is set to "silent_", nothing will be printed at all, since
69 # the variable $(silent_cmd_cc_o_c) doesn't exist.
71 # A simple variant is to prefix commands with $(Q) - that's useful
72 # for commands that shall be hidden in non-verbose mode.
76 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
77 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
78 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
80 # To put more focus on warnings, be less verbose as default
81 # Use 'make V=1' to see the full commands
83 ifeq ("$(origin V)", "command line")
90 ifeq ($(KBUILD_VERBOSE),1)
98 # If the user is running make -s (silent mode), suppress echoing of
100 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
102 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
103 silence:=$(findstring s,$(firstword -$(MAKEFLAGS)))
105 silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS)))
113 export quiet Q KBUILD_VERBOSE
115 # Call a source code checker (by default, "sparse") as part of the
118 # Use 'make C=1' to enable checking of only re-compiled files.
119 # Use 'make C=2' to enable checking of *all* source files, regardless
120 # of whether they are re-compiled or not.
122 # See the file "Documentation/dev-tools/sparse.rst" for more details,
123 # including where to get the "sparse" utility.
125 ifeq ("$(origin C)", "command line")
126 KBUILD_CHECKSRC = $(C)
128 ifndef KBUILD_CHECKSRC
132 export KBUILD_CHECKSRC
134 # Enable "clippy" (a linter) as part of the Rust compilation.
136 # Use 'make CLIPPY=1' to enable it.
137 ifeq ("$(origin CLIPPY)", "command line")
138 KBUILD_CLIPPY := $(CLIPPY)
143 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
144 # directory of external module to build. Setting M= takes precedence.
145 ifeq ("$(origin M)", "command line")
146 KBUILD_EXTMOD := $(M)
149 $(if $(word 2, $(KBUILD_EXTMOD)), \
150 $(error building multiple external modules is not supported))
152 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
153 $(error module directory path cannot contain '$x')))
155 # Remove trailing slashes
156 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
157 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
162 # Kbuild will save output files in the current working directory.
163 # This does not need to match to the root of the kernel source tree.
165 # For example, you can do this:
167 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
169 # If you want to save output files in a different location, there are
170 # two syntaxes to specify it.
173 # Use "make O=dir/to/store/output/files/"
175 # 2) Set KBUILD_OUTPUT
176 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
177 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
179 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
182 # Do we want to change the working directory?
183 ifeq ("$(origin O)", "command line")
184 KBUILD_OUTPUT := $(O)
187 ifneq ($(KBUILD_OUTPUT),)
188 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
189 # expand a shell special character '~'. We use a somewhat tedious way here.
190 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
191 $(if $(abs_objtree),, \
192 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
194 # $(realpath ...) resolves symlinks
195 abs_objtree := $(realpath $(abs_objtree))
197 abs_objtree := $(CURDIR)
198 endif # ifneq ($(KBUILD_OUTPUT),)
200 ifeq ($(abs_objtree),$(CURDIR))
201 # Suppress "Entering directory ..." unless we are changing the work directory.
202 MAKEFLAGS += --no-print-directory
207 this-makefile := $(lastword $(MAKEFILE_LIST))
208 abs_srctree := $(realpath $(dir $(this-makefile)))
210 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
211 $(error source directory cannot contain spaces or colons)
214 ifneq ($(abs_srctree),$(abs_objtree))
215 # Look for make include files relative to root of kernel src
217 # --included-dir is added for backward compatibility, but you should not rely on
218 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
219 MAKEFLAGS += --include-dir=$(abs_srctree)
222 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
223 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
224 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
226 # Cancel implicit rules for this Makefile.
230 export abs_srctree abs_objtree
231 export sub_make_done := 1
233 ifeq ($(need-sub-make),1)
235 PHONY += $(MAKECMDGOALS) __sub-make
237 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
240 # Invoke a second make in the output directory, passing relevant variables
242 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
244 endif # need-sub-make
245 endif # sub_make_done
247 # We process the rest of the Makefile if this is the final invocation of make
248 ifeq ($(need-sub-make),)
250 # Do not print "Entering directory ...",
251 # but we want to display it when entering to the output directory
252 # so that IDEs/editors are able to understand relative filenames.
253 MAKEFLAGS += --no-print-directory
255 ifeq ($(abs_srctree),$(abs_objtree))
256 # building in the source tree
258 building_out_of_srctree :=
260 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
261 # building in a subdirectory of the source tree
264 srctree := $(abs_srctree)
266 building_out_of_srctree := 1
269 ifneq ($(KBUILD_ABS_SRCTREE),)
270 srctree := $(abs_srctree)
276 export building_out_of_srctree srctree objtree VPATH
278 # To make sure we do not include .config for any of the *config targets
279 # catch them early, and hand them over to scripts/kconfig/Makefile
280 # It is allowed to specify more targets when calling make, including
281 # mixing *config targets and build targets.
282 # For example 'make oldconfig all'.
283 # Detect when mixed targets is specified, and make a second invocation
284 # of make so .config is not included in this case either (for *config).
286 version_h := include/generated/uapi/linux/version.h
288 clean-targets := %clean mrproper cleandocs
289 no-dot-config-targets := $(clean-targets) \
290 cscope gtags TAGS tags help% %docs check% coccicheck \
291 $(version_h) headers headers_% archheaders archscripts \
292 %asm-generic kernelversion %src-pkg dt_binding_check \
293 outputmakefile rustavailable rustfmt rustfmtcheck
294 # Installation targets should not require compiler. Unfortunately, vdso_install
295 # is an exception where build artifacts may be updated. This must be fixed.
296 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
297 headers_install modules_install kernelrelease image_name
298 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
300 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
309 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
310 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
315 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
316 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
321 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
322 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
327 ifneq ($(KBUILD_EXTMOD),)
331 ifeq ($(KBUILD_EXTMOD),)
332 ifneq ($(filter %config,$(MAKECMDGOALS)),)
334 ifneq ($(words $(MAKECMDGOALS)),1)
340 # We cannot build single targets and the others at the same time
341 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
343 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
348 # For "make -j clean all", "make -j mrproper defconfig all", etc.
349 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
350 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
355 # install and modules_install need also be processed one by one
356 ifneq ($(filter install,$(MAKECMDGOALS)),)
357 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
363 # ===========================================================================
364 # We're called with mixed targets (*config and build targets).
365 # Handle them one by one.
367 PHONY += $(MAKECMDGOALS) __build_one_by_one
369 $(MAKECMDGOALS): __build_one_by_one
374 for i in $(MAKECMDGOALS); do \
375 $(MAKE) -f $(srctree)/Makefile $$i; \
380 include $(srctree)/scripts/Kbuild.include
382 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
383 KERNELRELEASE = $(call read-file, include/config/kernel.release)
384 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
385 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
387 include $(srctree)/scripts/subarch.include
389 # Cross compiling and selecting different set of gcc/bin-utils
390 # ---------------------------------------------------------------------------
392 # When performing cross compilation for other architectures ARCH shall be set
393 # to the target architecture. (See arch/* for the possibilities).
394 # ARCH can be set during invocation of make:
396 # Another way is to have ARCH set in the environment.
397 # The default ARCH is the host where make is executed.
399 # CROSS_COMPILE specify the prefix used for all executables used
400 # during compilation. Only gcc and related bin-utils executables
401 # are prefixed with $(CROSS_COMPILE).
402 # CROSS_COMPILE can be set on the command line
403 # make CROSS_COMPILE=ia64-linux-
404 # Alternatively CROSS_COMPILE can be set in the environment.
405 # Default value for CROSS_COMPILE is not to prefix executables
406 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
409 # Architecture as present in compile.h
410 UTS_MACHINE := $(ARCH)
413 # Additional ARCH settings for x86
417 ifeq ($(ARCH),x86_64)
421 # Additional ARCH settings for sparc
422 ifeq ($(ARCH),sparc32)
425 ifeq ($(ARCH),sparc64)
429 # Additional ARCH settings for parisc
430 ifeq ($(ARCH),parisc64)
434 export cross_compiling :=
435 ifneq ($(SRCARCH),$(SUBARCH))
439 KCONFIG_CONFIG ?= .config
440 export KCONFIG_CONFIG
442 # SHELL used by kbuild
445 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
446 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
447 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
450 ifneq ($(filter %/,$(LLVM)),)
451 LLVM_PREFIX := $(LLVM)
452 else ifneq ($(filter -%,$(LLVM)),)
453 LLVM_SUFFIX := $(LLVM)
456 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
457 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
463 HOSTPKG_CONFIG = pkg-config
465 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
466 -O2 -fomit-frame-pointer -std=gnu11 \
467 -Wdeclaration-after-statement
468 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
469 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
471 # These flags apply to all Rust code in the tree, including the kernel and
473 export rust_common_flags := --edition=2021 \
474 -Zbinary_dep_depinfo=y \
475 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
476 -Dunreachable_pub -Dnon_ascii_idents \
478 -Drustdoc::missing_crate_level_docs \
479 -Dclippy::correctness -Dclippy::style \
480 -Dclippy::suspicious -Dclippy::complexity \
482 -Dclippy::let_unit_value -Dclippy::mut_mut \
483 -Dclippy::needless_bitwise_bool \
484 -Dclippy::needless_continue \
487 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
488 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
489 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
490 -Zallow-features= $(HOSTRUSTFLAGS)
491 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
492 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
494 # Make variables (CC, etc...)
497 CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
498 LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
499 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
500 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
501 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
502 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
503 READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
504 STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
506 CC = $(CROSS_COMPILE)gcc
507 LD = $(CROSS_COMPILE)ld
508 AR = $(CROSS_COMPILE)ar
509 NM = $(CROSS_COMPILE)nm
510 OBJCOPY = $(CROSS_COMPILE)objcopy
511 OBJDUMP = $(CROSS_COMPILE)objdump
512 READELF = $(CROSS_COMPILE)readelf
513 STRIP = $(CROSS_COMPILE)strip
518 CLIPPY_DRIVER = clippy-driver
522 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
526 INSTALLKERNEL := installkernel
540 PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
542 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
543 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
554 # Use USERINCLUDE when you must reference the UAPI directories only.
556 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
557 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
558 -I$(srctree)/include/uapi \
559 -I$(objtree)/include/generated/uapi \
560 -include $(srctree)/include/linux/compiler-version.h \
561 -include $(srctree)/include/linux/kconfig.h
563 # Use LINUXINCLUDE when you must reference the include/ directory.
564 # Needed to be compatible with the O= option
566 -I$(srctree)/arch/$(SRCARCH)/include \
567 -I$(objtree)/arch/$(SRCARCH)/include/generated \
568 $(if $(building_out_of_srctree),-I$(srctree)/include) \
569 -I$(objtree)/include \
572 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
573 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
574 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
575 -Werror=implicit-function-declaration -Werror=implicit-int \
576 -Werror=return-type -Wno-format-security -funsigned-char \
578 KBUILD_CPPFLAGS := -D__KERNEL__
579 KBUILD_RUSTFLAGS := $(rust_common_flags) \
580 --target=$(objtree)/rust/target.json \
581 -Cpanic=abort -Cembed-bitcode=n -Clto=n \
582 -Cforce-unwind-tables=n -Ccodegen-units=1 \
583 -Csymbol-mangling-version=v0 \
584 -Crelocation-model=static \
585 -Zfunction-sections=n \
586 -Dclippy::float_arithmetic
588 KBUILD_AFLAGS_KERNEL :=
589 KBUILD_CFLAGS_KERNEL :=
590 KBUILD_RUSTFLAGS_KERNEL :=
591 KBUILD_AFLAGS_MODULE := -DMODULE
592 KBUILD_CFLAGS_MODULE := -DMODULE
593 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
594 KBUILD_LDFLAGS_MODULE :=
598 ifeq ($(KBUILD_CLIPPY),1)
599 RUSTC_OR_CLIPPY_QUIET := CLIPPY
600 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
602 RUSTC_OR_CLIPPY_QUIET := RUSTC
603 RUSTC_OR_CLIPPY = $(RUSTC)
610 # Allows the usage of unstable features in stable compilers.
611 export RUSTC_BOOTSTRAP := 1
613 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
614 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
615 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
616 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
617 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
618 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
619 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
620 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
622 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
623 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
624 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
625 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
626 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
627 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
630 # Files to ignore in find ... statements
632 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
633 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
635 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
636 --exclude CVS --exclude .pc --exclude .hg --exclude .git
638 # ===========================================================================
639 # Rules shared between *config targets and build targets
641 # Basic helpers built in scripts/basic/
642 PHONY += scripts_basic
644 $(Q)$(MAKE) $(build)=scripts/basic
646 PHONY += outputmakefile
647 ifdef building_out_of_srctree
648 # Before starting out-of-tree build, make sure the source tree is clean.
649 # outputmakefile generates a Makefile in the output directory, if using a
650 # separate output directory. This allows convenient use of make in the
652 # At the same time when output Makefile generated, generate .gitignore to
653 # ignore whole output directory
655 quiet_cmd_makefile = GEN Makefile
657 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
658 echo "include $(srctree)/Makefile"; \
662 @if [ -f $(srctree)/.config -o \
663 -d $(srctree)/include/config -o \
664 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
666 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
667 echo >&2 "*** in $(abs_srctree)";\
671 $(Q)ln -fsn $(srctree) source
673 $(Q)test -e .gitignore || \
674 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
677 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
678 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
679 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
680 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
681 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
683 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
684 include $(srctree)/scripts/Makefile.clang
687 # Include this also for config targets because some architectures need
688 # cc-cross-prefix to determine CROSS_COMPILE.
690 include $(srctree)/scripts/Makefile.compiler
694 # ===========================================================================
695 # *config targets only - make sure prerequisites are updated, and descend
696 # in scripts/kconfig to make the *config target
698 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
699 # KBUILD_DEFCONFIG may point out an alternative default configuration
700 # used for 'make defconfig'
701 include $(srctree)/arch/$(SRCARCH)/Makefile
702 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
704 config: outputmakefile scripts_basic FORCE
705 $(Q)$(MAKE) $(build)=scripts/kconfig $@
707 %config: outputmakefile scripts_basic FORCE
708 $(Q)$(MAKE) $(build)=scripts/kconfig $@
711 # ===========================================================================
712 # Build targets only - this includes vmlinux, arch specific targets, clean
713 # targets and others. In general all targets except *config targets.
715 # If building an external module we do not care about the all: rule
716 # but instead __all depend on modules
718 ifeq ($(KBUILD_EXTMOD),)
726 # Decide whether to build built-in, modular, or both.
727 # Normally, just do built-in.
732 # If we have only "make modules", don't compile built-in objects.
733 ifeq ($(MAKECMDGOALS),modules)
737 # If we have "make <whatever> modules", compile modules
738 # in addition to whatever we do anyway.
739 # Just "make" or "make all" shall build modules as well
741 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
745 ifeq ($(MAKECMDGOALS),)
749 export KBUILD_MODULES KBUILD_BUILTIN
752 include include/config/auto.conf
755 ifeq ($(KBUILD_EXTMOD),)
756 # Objects we will link into vmlinux / subdirs we need to visit
760 endif # KBUILD_EXTMOD
762 # The all: target is the default when no target is given on the
764 # This allow a user to issue only 'make' to build a kernel including modules
765 # Defaults to vmlinux, but the arch makefile usually adds further targets
768 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
769 ifdef CONFIG_CC_IS_GCC
770 CFLAGS_GCOV += -fno-tree-loop-im
774 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
775 ifdef CONFIG_FUNCTION_TRACER
776 CC_FLAGS_FTRACE := -pg
779 include $(srctree)/arch/$(SRCARCH)/Makefile
782 ifdef may-sync-config
783 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
784 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
785 # because some architectures define CROSS_COMPILE there.
786 include include/config/auto.conf.cmd
790 @echo >&2 '*** Configuration file "$@" not found!'
792 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
793 @echo >&2 '*** "make menuconfig" or "make xconfig").'
797 # The actual configuration files used during the build are stored in
798 # include/generated/ and include/config/. Update them if .config is newer than
799 # include/config/auto.conf (which mirrors .config).
801 # This exploits the 'multi-target pattern rule' trick.
802 # The syncconfig should be executed only once to make all the targets.
803 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
805 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
806 # so you cannot notice that Kconfig is waiting for the user input.
807 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
808 $(Q)$(kecho) " SYNC $@"
809 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
810 else # !may-sync-config
811 # External modules and some install targets need include/generated/autoconf.h
812 # and include/config/auto.conf but do not care if they are up-to-date.
813 # Use auto.conf to trigger the test
814 PHONY += include/config/auto.conf
816 include/config/auto.conf:
817 @test -e include/generated/autoconf.h -a -e $@ || ( \
819 echo >&2 " ERROR: Kernel configuration is invalid."; \
820 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
821 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
825 endif # may-sync-config
828 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
829 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
830 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
831 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
832 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
834 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
836 KBUILD_RUSTFLAGS += -Copt-level=2
837 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
839 KBUILD_RUSTFLAGS += -Copt-level=s
842 # Always set `debug-assertions` and `overflow-checks` because their default
843 # depends on `opt-level` and `debug-assertions`, respectively.
844 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
845 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
847 # Tell gcc to never replace conditional load with a non-conditional one
848 ifdef CONFIG_CC_IS_GCC
849 # gcc-10 renamed --param=allow-store-data-races=0 to
850 # -fno-allow-store-data-races.
851 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
852 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
855 ifdef CONFIG_READABLE_ASM
856 # Disable optimizations that make assembler listings hard to read.
857 # reorder blocks reorders the control in the function
858 # ipa clone creates specialized cloned functions
859 # partial inlining inlines only parts of functions
860 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
863 ifneq ($(CONFIG_FRAME_WARN),0)
864 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
867 stackp-flags-y := -fno-stack-protector
868 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
869 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
871 KBUILD_CFLAGS += $(stackp-flags-y)
873 KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
874 KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
875 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
877 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
878 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
880 ifdef CONFIG_CC_IS_CLANG
881 KBUILD_CPPFLAGS += -Qunused-arguments
882 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
883 KBUILD_CFLAGS += -Wno-gnu
886 # gcc inanely warns about local variables called 'main'
887 KBUILD_CFLAGS += -Wno-main
890 # These warnings generated too much noise in a regular build.
891 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
892 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
893 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
895 # These result in bogus false positives
896 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
898 ifdef CONFIG_FRAME_POINTER
899 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
900 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
902 # Some targets (ARM with Thumb2, for example), can't be built with frame
903 # pointers. For those, we don't have FUNCTION_TRACER automatically
904 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
905 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
906 # -fomit-frame-pointer with FUNCTION_TRACER.
907 # In the Rust target specification, "frame-pointer" is set explicitly
909 ifndef CONFIG_FUNCTION_TRACER
910 KBUILD_CFLAGS += -fomit-frame-pointer
914 # Initialize all stack variables with a 0xAA pattern.
915 ifdef CONFIG_INIT_STACK_ALL_PATTERN
916 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
919 # Initialize all stack variables with a zero value.
920 ifdef CONFIG_INIT_STACK_ALL_ZERO
921 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
922 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
923 # https://github.com/llvm/llvm-project/issues/44842
924 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
928 # While VLAs have been removed, GCC produces unreachable stack probes
929 # for the randomize_kstack_offset feature. Disable it for all compilers.
930 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
932 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
933 ifdef CONFIG_ZERO_CALL_USED_REGS
934 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
937 ifdef CONFIG_FUNCTION_TRACER
938 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
939 CC_FLAGS_FTRACE += -mrecord-mcount
940 ifdef CONFIG_HAVE_NOP_MCOUNT
941 ifeq ($(call cc-option-yn, -mnop-mcount),y)
942 CC_FLAGS_FTRACE += -mnop-mcount
943 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
947 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
948 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
949 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
952 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
953 ifdef CONFIG_HAVE_C_RECORDMCOUNT
954 BUILD_C_RECORDMCOUNT := y
955 export BUILD_C_RECORDMCOUNT
958 ifdef CONFIG_HAVE_FENTRY
959 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
960 ifeq ($(call cc-option-yn, -mfentry),y)
961 CC_FLAGS_FTRACE += -mfentry
962 CC_FLAGS_USING += -DCC_USING_FENTRY
965 export CC_FLAGS_FTRACE
966 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
967 KBUILD_AFLAGS += $(CC_FLAGS_USING)
970 # We trigger additional mismatches with less inlining
971 ifdef CONFIG_DEBUG_SECTION_MISMATCH
972 KBUILD_CFLAGS += -fno-inline-functions-called-once
975 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
976 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
977 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
978 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
979 LDFLAGS_vmlinux += --gc-sections
982 ifdef CONFIG_SHADOW_CALL_STACK
983 ifndef CONFIG_DYNAMIC_SCS
984 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
985 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
990 ifdef CONFIG_LTO_CLANG
991 ifdef CONFIG_LTO_CLANG_THIN
992 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
993 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
995 CC_FLAGS_LTO := -flto
997 CC_FLAGS_LTO += -fvisibility=hidden
999 # Limit inlining across translation units to reduce binary size
1000 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
1002 # Check for frame size exceeding threshold during prolog/epilog insertion
1003 # when using lld < 13.0.0.
1004 ifneq ($(CONFIG_FRAME_WARN),0)
1005 ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y)
1006 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
1012 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
1013 KBUILD_AFLAGS += -fno-lto
1017 ifdef CONFIG_CFI_CLANG
1018 CC_FLAGS_CFI := -fsanitize=kcfi
1019 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
1023 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
1024 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
1027 # arch Makefile may override CC so keep this after arch Makefile is included
1028 NOSTDINC_FLAGS += -nostdinc
1030 # warn about C99 declaration after statement
1031 KBUILD_CFLAGS += -Wdeclaration-after-statement
1033 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1034 KBUILD_CFLAGS += -Wvla
1036 # disable pointer signed / unsigned warnings in gcc 4.0
1037 KBUILD_CFLAGS += -Wno-pointer-sign
1039 # In order to make sure new function cast mismatches are not introduced
1040 # in the kernel (to avoid tripping CFI checking), the kernel should be
1041 # globally built with -Wcast-function-type.
1042 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
1044 # disable stringop warnings in gcc 8+
1045 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
1047 # We'll want to enable this eventually, but it's not going away for 5.7 at least
1048 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
1050 # Another good warning that we'll want to enable eventually
1051 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1053 # Enabled with W=2, disabled by default as noisy
1054 ifdef CONFIG_CC_IS_GCC
1055 KBUILD_CFLAGS += -Wno-maybe-uninitialized
1058 # The allocators already balk at large sizes, so silence the compiler
1059 # warnings for bounds checks involving those possible values. While
1060 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
1061 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
1062 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1063 # doesn't work (as it is documented to), silently resolving to "0" prior to
1064 # version 9.1 (and producing an error more recently). Numeric values larger
1065 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1066 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1067 # choice, we must perform a versioned check to disable this warning.
1068 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
1069 KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
1070 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
1072 # disable invalid "can't wrap" optimizations for signed / pointers
1073 KBUILD_CFLAGS += -fno-strict-overflow
1075 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1076 KBUILD_CFLAGS += -fno-stack-check
1078 # conserve stack if available
1079 ifdef CONFIG_CC_IS_GCC
1080 KBUILD_CFLAGS += -fconserve-stack
1083 # Prohibit date/time macros, which would make the build non-deterministic
1084 KBUILD_CFLAGS += -Werror=date-time
1086 # enforce correct pointer usage
1087 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
1089 # Require designated initializers for all marked structures
1090 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1092 # change __FILE__ to the relative path from the srctree
1093 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1095 # include additional Makefiles when needed
1096 include-y := scripts/Makefile.extrawarn
1097 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1098 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1099 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1100 include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan
1101 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1102 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1103 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct
1104 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1106 include $(addprefix $(srctree)/, $(include-y))
1108 # scripts/Makefile.gcc-plugins is intentionally included last.
1109 # Do not add $(call cc-option,...) below this line. When you build the kernel
1110 # from the clean source tree, the GCC plugins do not exist at this point.
1112 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1113 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1114 KBUILD_AFLAGS += $(KAFLAGS)
1115 KBUILD_CFLAGS += $(KCFLAGS)
1116 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1118 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1119 LDFLAGS_vmlinux += --build-id=sha1
1121 KBUILD_LDFLAGS += -z noexecstack
1122 ifeq ($(CONFIG_LD_IS_BFD),y)
1123 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
1126 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1127 LDFLAGS_vmlinux += -X
1130 ifeq ($(CONFIG_RELR),y)
1131 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1134 # We never want expected sections to be placed heuristically by the
1135 # linker. All sections should be explicitly named in the linker script.
1136 ifdef CONFIG_LD_ORPHAN_WARN
1137 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1140 # Align the bit size of userspace programs with the kernel
1141 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1142 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1144 # make the checker run with the right architecture
1145 CHECKFLAGS += --arch=$(ARCH)
1147 # insure the checker run with the right endianness
1148 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1150 # the checker needs the correct machine size
1151 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1153 # Default kernel image to build when no specific target is given.
1154 # KBUILD_IMAGE may be overruled on the command line or
1155 # set in the environment
1156 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1157 # this default value
1158 export KBUILD_IMAGE ?= vmlinux
1161 # INSTALL_PATH specifies where to place the updated kernel and system map
1162 # images. Default is /boot, but you can set it to other values
1163 export INSTALL_PATH ?= /boot
1166 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1167 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1168 # an argument if needed. Otherwise it defaults to the kernel install path
1170 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1173 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1174 # relocations required by build roots. This is not defined in the
1175 # makefile but the argument can be passed to make if needed.
1178 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1183 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1184 export MODORDER := $(extmod_prefix)modules.order
1185 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1187 ifeq ($(KBUILD_EXTMOD),)
1190 clean-dirs := $(sort . Documentation \
1191 $(patsubst %/,%,$(filter %/, $(core-) \
1192 $(drivers-) $(libs-))))
1194 export ARCH_CORE := $(core-y)
1195 export ARCH_LIB := $(filter %/, $(libs-y))
1196 export ARCH_DRIVERS := $(drivers-y) $(drivers-m)
1197 # Externally visible symbols (used by link-vmlinux.sh)
1199 KBUILD_VMLINUX_OBJS := ./built-in.a
1200 ifdef CONFIG_MODULES
1201 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1202 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1204 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1207 export KBUILD_VMLINUX_LIBS
1208 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1210 # Recurse until adjust_autoksyms.sh is satisfied
1211 PHONY += autoksyms_recursive
1212 ifdef CONFIG_TRIM_UNUSED_KSYMS
1213 # For the kernel to actually contain only the needed exported symbols,
1214 # we have to build modules as well to determine what those symbols are.
1215 # (this can be evaluated only once include/config/auto.conf has been included)
1218 autoksyms_recursive: $(build-dir) modules.order
1219 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1220 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1223 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1225 quiet_cmd_autoksyms_h = GEN $@
1226 cmd_autoksyms_h = mkdir -p $(dir $@); \
1227 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1230 $(call cmd,autoksyms_h)
1232 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1233 quiet_cmd_ar_vmlinux.a = AR $@
1234 cmd_ar_vmlinux.a = \
1236 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1237 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1239 targets += vmlinux.a
1240 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE
1241 $(call if_changed,ar_vmlinux.a)
1244 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1245 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1247 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1251 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1252 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1253 # unrelated; the decompressors just happen to have the same base name,
1254 # arch/*/boot/compressed/vmlinux.
1255 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1257 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1258 # https://savannah.gnu.org/bugs/?61463
1259 # For Make > 4.4, the following simple code will work:
1260 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1261 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1262 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1263 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1264 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1266 # The actual objects are generated when descending,
1267 # make sure no implicit rule kicks in
1268 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1270 filechk_kernel.release = \
1271 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1273 # Store (new) KERNELRELEASE string in include/config/kernel.release
1274 include/config/kernel.release: FORCE
1275 $(call filechk,kernel.release)
1277 # Additional helpers built in scripts/
1278 # Carefully list dependencies so we do not try to build scripts twice
1281 scripts: scripts_basic scripts_dtc
1282 $(Q)$(MAKE) $(build)=$(@)
1284 # Things we need to do before we recursively start building the kernel
1285 # or the modules are listed in "prepare".
1286 # A multi level approach is used. prepareN is processed before prepareN-1.
1287 # archprepare is used in arch Makefiles and when processed asm symlink,
1288 # version.h and scripts_basic is processed / created.
1290 PHONY += prepare archprepare
1292 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1293 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1294 include/generated/compile.h include/generated/autoconf.h remove-stale-files
1296 prepare0: archprepare
1297 $(Q)$(MAKE) $(build)=scripts/mod
1298 $(Q)$(MAKE) $(build)=. prepare
1300 # All the preparing..
1303 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v
1304 $(Q)$(MAKE) $(build)=rust
1307 PHONY += remove-stale-files
1309 $(Q)$(srctree)/scripts/remove-stale-files
1311 # Support for using generic headers in asm-generic
1312 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1314 PHONY += asm-generic uapi-asm-generic
1315 asm-generic: uapi-asm-generic
1316 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1317 generic=include/asm-generic
1319 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1320 generic=include/uapi/asm-generic
1322 # Generate some files
1323 # ---------------------------------------------------------------------------
1325 # KERNELRELEASE can change from a few different places, meaning version.h
1326 # needs to be updated, so this check is forced on all builds
1329 define filechk_utsrelease.h
1330 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1331 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1334 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1337 define filechk_version.h
1338 if [ $(SUBLEVEL) -gt 255 ]; then \
1339 echo \#define LINUX_VERSION_CODE $(shell \
1340 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1342 echo \#define LINUX_VERSION_CODE $(shell \
1343 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1345 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1346 ((c) > 255 ? 255 : (c)))'; \
1347 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1348 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1349 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1352 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1353 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1355 $(call filechk,version.h)
1357 include/generated/utsrelease.h: include/config/kernel.release FORCE
1358 $(call filechk,utsrelease.h)
1360 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1361 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1363 include/generated/compile.h: FORCE
1364 $(call filechk,compile.h)
1368 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1369 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1371 # ---------------------------------------------------------------------------
1374 #Default location for installed headers
1375 export INSTALL_HDR_PATH = $(objtree)/usr
1377 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1378 cmd_headers_install = \
1379 mkdir -p $(INSTALL_HDR_PATH); \
1380 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1381 usr/include $(INSTALL_HDR_PATH)
1383 PHONY += headers_install
1384 headers_install: headers
1385 $(call cmd,headers_install)
1387 PHONY += archheaders archscripts
1389 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1392 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1393 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1394 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1395 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1397 ifdef CONFIG_HEADERS_INSTALL
1401 PHONY += scripts_unifdef
1402 scripts_unifdef: scripts_basic
1403 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1405 # ---------------------------------------------------------------------------
1408 # Many distributions have the custom install script, /sbin/installkernel.
1409 # If DKMS is installed, 'make install' will eventually recurse back
1410 # to this Makefile to build and install external modules.
1411 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1413 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1414 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1416 # ---------------------------------------------------------------------------
1419 ifdef CONFIG_OBJTOOL
1420 prepare: tools/objtool
1424 ifdef CONFIG_DEBUG_INFO_BTF
1425 prepare: tools/bpf/resolve_btfids
1429 PHONY += resolve_btfids_clean
1431 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1433 # tools/bpf/resolve_btfids directory might not exist
1434 # in output directory, skip its clean in that case
1435 resolve_btfids_clean:
1436 ifneq ($(wildcard $(resolve_btfids_O)),)
1437 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1440 # Clear a bunch of variables before executing the submake
1441 ifeq ($(quiet),silent_)
1446 $(Q)mkdir -p $(objtree)/tools
1447 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1450 $(Q)mkdir -p $(objtree)/tools
1451 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1453 # ---------------------------------------------------------------------------
1458 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1460 kselftest-%: headers FORCE
1461 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1463 PHONY += kselftest-merge
1465 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1466 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1467 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1468 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1470 # ---------------------------------------------------------------------------
1473 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1474 dtstree := arch/$(SRCARCH)/boot/dts
1480 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1482 %.dtbo: dtbs_prepare
1483 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1485 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1487 $(Q)$(MAKE) $(build)=$(dtstree)
1489 # include/config/kernel.release is actually needed when installing DTBs because
1490 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1491 # dtbs_install depend on it as dtbs_install may run as root.
1492 dtbs_prepare: include/config/kernel.release scripts_dtc
1494 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1498 ifneq ($(CHECK_DTBS),)
1499 dtbs_prepare: dt_binding_check
1505 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1507 ifdef CONFIG_OF_EARLY_FLATTREE
1513 PHONY += scripts_dtc
1514 scripts_dtc: scripts_basic
1515 $(Q)$(MAKE) $(build)=scripts/dtc
1517 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1518 export CHECK_DT_BINDING=y
1521 PHONY += dt_binding_check
1522 dt_binding_check: scripts_dtc
1523 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1525 PHONY += dt_compatible_check
1526 dt_compatible_check: dt_binding_check
1527 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1529 # ---------------------------------------------------------------------------
1532 ifdef CONFIG_MODULES
1534 # By default, build modules as well
1538 # When we're building modules with modversions, we need to consider
1539 # the built-in objects during the descend as well, in order to
1540 # make sure the checksums are up to date before we record them.
1541 ifdef CONFIG_MODVERSIONS
1548 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES
1550 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1555 modules: modules_prepare
1557 # Target to prepare building external modules
1558 modules_prepare: prepare
1559 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1561 export modules_sign_only :=
1563 ifeq ($(CONFIG_MODULE_SIG),y)
1564 PHONY += modules_sign
1565 modules_sign: modules_install
1568 # modules_sign is a subset of modules_install.
1569 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1570 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1571 modules_sign_only := y
1576 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1577 modinst_pre := __modinst_pre
1580 modules_install: $(modinst_pre)
1581 PHONY += __modinst_pre
1583 @rm -rf $(MODLIB)/kernel
1584 @rm -f $(MODLIB)/source
1585 @mkdir -p $(MODLIB)/kernel
1586 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1587 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1588 rm -f $(MODLIB)/build ; \
1589 ln -s $(CURDIR) $(MODLIB)/build ; \
1591 @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order
1592 @cp -f modules.builtin $(MODLIB)/
1593 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1595 endif # CONFIG_MODULES
1598 # Cleaning is done on three levels.
1599 # make clean Delete most generated files
1600 # Leave enough to build external modules
1601 # make mrproper Delete the current configuration, and all generated files
1602 # make distclean Remove editor backup files, patch leftover files and the like
1604 # Directories & files removed with 'make clean'
1605 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1606 modules.builtin modules.builtin.modinfo modules.nsdeps \
1607 compile_commands.json .thinlto-cache rust/test rust/doc \
1608 rust-project.json .vmlinux.objs .vmlinux.export.c
1610 # Directories & files removed with 'make mrproper'
1611 MRPROPER_FILES += include/config include/generated \
1612 arch/$(SRCARCH)/include/generated .objdiff \
1613 debian snap tar-install \
1614 .config .config.old .version \
1616 certs/signing_key.pem \
1620 rust/target.json rust/libmacros.so
1622 # clean - Delete most, but leave enough to build external modules
1624 clean: rm-files := $(CLEAN_FILES)
1626 PHONY += archclean vmlinuxclean
1629 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1630 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1632 clean: archclean vmlinuxclean resolve_btfids_clean
1634 # mrproper - Delete all generated files, including .config
1636 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1637 mrproper-dirs := $(addprefix _mrproper_,scripts)
1639 PHONY += $(mrproper-dirs) mrproper
1641 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1643 mrproper: clean $(mrproper-dirs)
1645 @find . $(RCS_FIND_IGNORE) \
1646 \( -name '*.rmeta' \) \
1647 -type f -print | xargs rm -f
1654 @find . $(RCS_FIND_IGNORE) \
1655 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1656 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1657 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1658 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1659 -type f -print | xargs rm -f
1662 # Packaging of the kernel to various formats
1663 # ---------------------------------------------------------------------------
1666 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1667 %pkg: include/config/kernel.release FORCE
1668 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1670 # Brief documentation of the typical targets used
1671 # ---------------------------------------------------------------------------
1673 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1674 boards := $(sort $(notdir $(boards)))
1675 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1676 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1680 @echo 'Cleaning targets:'
1681 @echo ' clean - Remove most generated files but keep the config and'
1682 @echo ' enough build support to build external modules'
1683 @echo ' mrproper - Remove all generated files + config + various backup files'
1684 @echo ' distclean - mrproper + remove editor backup and patch files'
1686 @echo 'Configuration targets:'
1687 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1689 @echo 'Other generic targets:'
1690 @echo ' all - Build all targets marked with [*]'
1691 @echo '* vmlinux - Build the bare kernel'
1692 @echo '* modules - Build all modules'
1693 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1694 @echo ' dir/ - Build all files in dir and below'
1695 @echo ' dir/file.[ois] - Build specified target only'
1696 @echo ' dir/file.ll - Build the LLVM assembly file'
1697 @echo ' (requires compiler support for LLVM assembly generation)'
1698 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1699 @echo ' (requires a recent binutils and recent build (System.map))'
1700 @echo ' dir/file.ko - Build module including final link'
1701 @echo ' modules_prepare - Set up for building external modules'
1702 @echo ' tags/TAGS - Generate tags file for editors'
1703 @echo ' cscope - Generate cscope index'
1704 @echo ' gtags - Generate GNU GLOBAL index'
1705 @echo ' kernelrelease - Output the release version string (use with make -s)'
1706 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1707 @echo ' image_name - Output the image name (use with make -s)'
1708 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1709 echo ' (default: $(INSTALL_HDR_PATH))'; \
1711 @echo 'Static analysers:'
1712 @echo ' checkstack - Generate a list of stack hogs'
1713 @echo ' versioncheck - Sanity check on version.h usage'
1714 @echo ' includecheck - Check for duplicate included header files'
1715 @echo ' export_report - List the usages of all exported symbols'
1716 @echo ' headerdep - Detect inclusion cycles in headers'
1717 @echo ' coccicheck - Check with Coccinelle'
1718 @echo ' clang-analyzer - Check with clang static analyzer'
1719 @echo ' clang-tidy - Check with clang-tidy'
1722 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1724 @echo 'Kernel selftest:'
1725 @echo ' kselftest - Build and run kernel selftest'
1726 @echo ' Build, install, and boot kernel before'
1727 @echo ' running kselftest on it'
1728 @echo ' Run as root for full coverage'
1729 @echo ' kselftest-all - Build kernel selftest'
1730 @echo ' kselftest-install - Build and install kernel selftest'
1731 @echo ' kselftest-clean - Remove all generated kselftest files'
1732 @echo ' kselftest-merge - Merge all the config dependencies of'
1733 @echo ' kselftest to existing .config.'
1735 @echo 'Rust targets:'
1736 @echo ' rustavailable - Checks whether the Rust toolchain is'
1737 @echo ' available and, if not, explains why.'
1738 @echo ' rustfmt - Reformat all the Rust code in the kernel'
1739 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel'
1740 @echo ' is formatted, printing a diff otherwise.'
1741 @echo ' rustdoc - Generate Rust documentation'
1742 @echo ' (requires kernel .config)'
1743 @echo ' rusttest - Runs the Rust tests'
1744 @echo ' (requires kernel .config; downloads external repos)'
1745 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1746 @echo ' (requires kernel .config)'
1747 @echo ' dir/file.[os] - Build specified target only'
1748 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1749 @echo ' Run with RUSTFMT=n to skip reformatting if needed.'
1750 @echo ' The output is not intended to be compilable.'
1751 @echo ' dir/file.ll - Build the LLVM assembly file'
1754 echo 'Devicetree:'; \
1755 echo '* dtbs - Build device tree blobs for enabled boards'; \
1756 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1757 echo ' dt_binding_check - Validate device tree binding documents'; \
1758 echo ' dtbs_check - Validate device tree source files';\
1761 @echo 'Userspace tools targets:'
1762 @echo ' use "make tools/help"'
1763 @echo ' or "cd tools; make help"'
1765 @echo 'Kernel packaging:'
1766 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1768 @echo 'Documentation targets:'
1769 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1771 @echo 'Architecture specific targets ($(SRCARCH)):'
1773 echo ' No architecture specific help defined for $(SRCARCH)')
1776 $(foreach b, $(boards), \
1777 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1779 @$(if $(board-dirs), \
1780 $(foreach b, $(board-dirs), \
1781 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1782 printf " %-16s - Show all of the above\\n" help-boards; \
1785 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1786 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1787 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1788 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1789 @echo ' (sparse by default)'
1790 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1791 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1792 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1793 @echo ' 1: warnings which may be relevant and do not occur too often'
1794 @echo ' 2: warnings which occur quite often but may still be relevant'
1795 @echo ' 3: more obscure warnings, can most likely be ignored'
1796 @echo ' e: warnings are being treated as errors'
1797 @echo ' Multiple levels can be combined with W=12 or W=123'
1799 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1800 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1803 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1804 @echo 'For further info see the ./README file'
1807 help-board-dirs := $(addprefix help-,$(board-dirs))
1809 help-boards: $(help-board-dirs)
1811 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1813 $(help-board-dirs): help-%:
1814 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1815 @$(if $(boards-per-dir), \
1816 $(foreach b, $(boards-per-dir), \
1817 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1821 # Documentation targets
1822 # ---------------------------------------------------------------------------
1823 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1824 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1825 PHONY += $(DOC_TARGETS)
1827 $(Q)$(MAKE) $(build)=Documentation $@
1831 # ---------------------------------------------------------------------------
1833 # "Is Rust available?" target
1834 PHONY += rustavailable
1836 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!"
1838 # Documentation target
1840 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1843 $(Q)$(MAKE) $(build)=rust $@
1848 $(Q)$(MAKE) $(build)=rust $@
1850 # Formatting targets
1851 PHONY += rustfmt rustfmtcheck
1853 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1855 # We match using absolute paths since `find` does not resolve them
1856 # when matching, which is a problem when e.g. `srctree` is `..`.
1857 # We `grep` afterwards in order to remove the directory entry itself.
1859 $(Q)find $(abs_srctree) -type f -name '*.rs' \
1860 -o -path $(abs_srctree)/rust/alloc -prune \
1861 -o -path $(abs_objtree)/rust/test -prune \
1862 | grep -Fv $(abs_srctree)/rust/alloc \
1863 | grep -Fv $(abs_objtree)/rust/test \
1864 | grep -Fv generated \
1865 | xargs $(RUSTFMT) $(rustfmt_flags)
1867 rustfmtcheck: rustfmt_flags = --check
1868 rustfmtcheck: rustfmt
1870 # IDE support targets
1871 PHONY += rust-analyzer
1873 $(Q)$(MAKE) $(build)=rust $@
1876 # ---------------------------------------------------------------------------
1878 PHONY += scripts_gdb
1879 scripts_gdb: prepare0
1880 $(Q)$(MAKE) $(build)=scripts/gdb
1881 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1883 ifdef CONFIG_GDB_SCRIPTS
1887 else # KBUILD_EXTMOD
1890 # External module support.
1891 # When building external modules the kernel used as basis is considered
1892 # read-only, and no consistency checks are made and the make
1893 # system is not used on the basis kernel. If updates are required
1894 # in the basis kernel ordinary make commands (without M=...) must be used.
1896 # We are always building only modules.
1900 build-dir := $(KBUILD_EXTMOD)
1902 compile_commands.json: $(extmod_prefix)compile_commands.json
1903 PHONY += compile_commands.json
1905 clean-dirs := $(KBUILD_EXTMOD)
1906 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1907 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1910 # now expand this into a simple variable to reduce the cost of shell evaluations
1911 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1913 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1914 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1915 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1916 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1921 @echo ' Building external modules.'
1922 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1924 @echo ' modules - default target, build the module(s)'
1925 @echo ' modules_install - install the module'
1926 @echo ' clean - remove generated files in module directory only'
1929 endif # KBUILD_EXTMOD
1931 # ---------------------------------------------------------------------------
1934 PHONY += modules modules_install modules_prepare
1936 ifdef CONFIG_MODULES
1938 $(MODORDER): $(build-dir)
1941 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1942 # This is solely useful to speed up test compiles.
1944 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1945 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1948 PHONY += modules_check
1949 modules_check: $(MODORDER)
1950 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1952 quiet_cmd_depmod = DEPMOD $(MODLIB)
1953 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1957 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1960 else # CONFIG_MODULES
1962 # Modules not configured
1963 # ---------------------------------------------------------------------------
1965 modules modules_install:
1967 @echo >&2 '*** The present kernel configuration has modules disabled.'
1968 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1969 @echo >&2 '*** to enable CONFIG_MODULES.'
1975 endif # CONFIG_MODULES
1978 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1979 $(if $(KBUILD_MODULES), modules_check)
1980 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1983 # ---------------------------------------------------------------------------
1984 # To build individual files in subdirectories, you can do like this:
1986 # make foo/bar/baz.s
1988 # The supported suffixes for single-target are listed in 'single-targets'
1990 # To build only under specific subdirectories, you can do like this:
1996 # .ko is special because modpost is needed
1997 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1998 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1999 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
2001 $(single-ko): single_modules
2003 $(single-no-ko): $(build-dir)
2006 # Remove MODORDER when done because it is not the real one.
2007 PHONY += single_modules
2008 single_modules: $(single-no-ko) modules_prepare
2009 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
2010 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
2011 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
2012 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
2014 $(Q)rm -f $(MODORDER)
2016 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
2022 # Preset locale variables to speed up the build process. Limit locale
2023 # tweaks to this spot to avoid wrong language settings when running
2024 # make menuconfig etc.
2025 # Error messages still appears in the original language
2026 PHONY += $(build-dir)
2027 $(build-dir): prepare
2028 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
2030 clean-dirs := $(addprefix _clean_, $(clean-dirs))
2031 PHONY += $(clean-dirs) clean
2033 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
2035 clean: $(clean-dirs)
2037 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
2038 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
2040 -o -name '*.dtb' -o -name '*.dtbo' \
2041 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
2042 -o -name '*.dt.yaml' \
2043 -o -name '*.dwo' -o -name '*.lst' \
2044 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \
2045 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
2046 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
2047 -o -name '*.asn1.[ch]' \
2048 -o -name '*.symtypes' -o -name 'modules.order' \
2050 -o -name '*.c.[012]*.*' \
2053 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
2055 # Generate tags for editors
2056 # ---------------------------------------------------------------------------
2057 quiet_cmd_tags = GEN $@
2058 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
2060 tags TAGS cscope gtags: FORCE
2063 # Script to generate missing namespace dependencies
2064 # ---------------------------------------------------------------------------
2067 nsdeps: export KBUILD_NSDEPS=1
2069 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
2072 # ---------------------------------------------------------------------------
2074 quiet_cmd_gen_compile_commands = GEN $@
2075 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2077 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
2078 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2079 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
2080 $(call if_changed,gen_compile_commands)
2082 targets += $(extmod_prefix)compile_commands.json
2084 PHONY += clang-tidy clang-analyzer
2086 ifdef CONFIG_CC_IS_CLANG
2087 quiet_cmd_clang_tools = CHECK $<
2088 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2090 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
2091 $(call cmd,clang_tools)
2093 clang-tidy clang-analyzer:
2094 @echo "$@ requires CC=clang" >&2
2098 # Scripts to check various things for consistency
2099 # ---------------------------------------------------------------------------
2101 PHONY += includecheck versioncheck coccicheck export_report
2104 find $(srctree)/* $(RCS_FIND_IGNORE) \
2105 -name '*.[hcS]' -type f -print | sort \
2106 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2109 find $(srctree)/* $(RCS_FIND_IGNORE) \
2110 -name '*.[hcS]' -type f -print | sort \
2111 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2114 $(Q)$(BASH) $(srctree)/scripts/$@
2117 $(PERL) $(srctree)/scripts/export_report.pl
2119 PHONY += checkstack kernelrelease kernelversion image_name
2121 # UML needs a little special treatment here. It wants to use the host
2122 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2123 # else wants $(ARCH), including people doing cross-builds, which means
2124 # that $(SUBARCH) doesn't work here.
2126 CHECKSTACK_ARCH := $(SUBARCH)
2128 CHECKSTACK_ARCH := $(ARCH)
2131 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2132 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2135 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
2138 @echo $(KERNELVERSION)
2141 @echo $(KBUILD_IMAGE)
2143 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2144 cmd_rmfiles = rm -rf $(rm-files)
2146 # read saved command lines for existing targets
2147 existing-targets := $(wildcard $(sort $(targets)))
2149 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2151 endif # config-build
2153 endif # need-sub-make
2158 # Declare the contents of the PHONY variable as phony. We keep that
2159 # information in a variable so we can use it in if_changed and friends.