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 # Most of build commands in Kbuild start with "cmd_". You can optionally define
60 # "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
61 # that command is printed by default.
64 # quiet_cmd_depmod = DEPMOD $(MODLIB)
65 # cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
67 # A simple variant is to prefix commands with $(Q) - that's useful
68 # for commands that shall be hidden in non-verbose mode.
70 # $(Q)$(MAKE) $(build)=scripts/basic
72 # If KBUILD_VERBOSE contains 1, the whole command is echoed.
73 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
75 # To put more focus on warnings, be less verbose as default
76 # Use 'make V=1' to see the full commands
78 ifeq ("$(origin V)", "command line")
85 ifneq ($(findstring 1, $(KBUILD_VERBOSE
)),)
90 # If the user is running make -s (silent mode), suppress echoing of
92 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
94 ifeq ($(filter 3.
%,$(MAKE_VERSION
)),)
95 short-opts
:= $(firstword -$(MAKEFLAGS
))
97 short-opts
:= $(filter-out --%,$(MAKEFLAGS
))
100 ifneq ($(findstring s
,$(short-opts
)),)
102 override KBUILD_VERBOSE
:=
105 export quiet Q KBUILD_VERBOSE
107 # Call a source code checker (by default, "sparse") as part of the
110 # Use 'make C=1' to enable checking of only re-compiled files.
111 # Use 'make C=2' to enable checking of *all* source files, regardless
112 # of whether they are re-compiled or not.
114 # See the file "Documentation/dev-tools/sparse.rst" for more details,
115 # including where to get the "sparse" utility.
117 ifeq ("$(origin C)", "command line")
118 KBUILD_CHECKSRC
= $(C
)
120 ifndef KBUILD_CHECKSRC
124 export KBUILD_CHECKSRC
126 # Enable "clippy" (a linter) as part of the Rust compilation.
128 # Use 'make CLIPPY=1' to enable it.
129 ifeq ("$(origin CLIPPY)", "command line")
130 KBUILD_CLIPPY
:= $(CLIPPY
)
135 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
136 # directory of external module to build. Setting M= takes precedence.
137 ifeq ("$(origin M)", "command line")
138 KBUILD_EXTMOD
:= $(M
)
141 $(if
$(word 2, $(KBUILD_EXTMOD
)), \
142 $(error building multiple external modules is not supported
))
144 $(foreach x
, % :, $(if
$(findstring $x, $(KBUILD_EXTMOD
)), \
145 $(error module directory path cannot contain
'$x')))
147 # Remove trailing slashes
148 ifneq ($(filter %/, $(KBUILD_EXTMOD
)),)
149 KBUILD_EXTMOD
:= $(shell dirname
$(KBUILD_EXTMOD
).
)
154 # Kbuild will save output files in the current working directory.
155 # This does not need to match to the root of the kernel source tree.
157 # For example, you can do this:
159 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
161 # If you want to save output files in a different location, there are
162 # two syntaxes to specify it.
165 # Use "make O=dir/to/store/output/files/"
167 # 2) Set KBUILD_OUTPUT
168 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
169 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
171 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
174 # Do we want to change the working directory?
175 ifeq ("$(origin O)", "command line")
176 KBUILD_OUTPUT
:= $(O
)
179 ifneq ($(KBUILD_OUTPUT
),)
180 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
181 # expand a shell special character '~'. We use a somewhat tedious way here.
182 abs_objtree
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) && pwd
)
183 $(if
$(abs_objtree
),, \
184 $(error failed to create output directory
"$(KBUILD_OUTPUT)"))
186 # $(realpath ...) resolves symlinks
187 abs_objtree
:= $(realpath
$(abs_objtree
))
189 abs_objtree
:= $(CURDIR
)
190 endif # ifneq ($(KBUILD_OUTPUT),)
192 ifeq ($(abs_objtree
),$(CURDIR
))
193 # Suppress "Entering directory ..." unless we are changing the work directory.
194 MAKEFLAGS
+= --no-print-directory
199 this-makefile
:= $(lastword
$(MAKEFILE_LIST
))
200 abs_srctree
:= $(realpath
$(dir $(this-makefile
)))
202 ifneq ($(words $(subst :, ,$(abs_srctree
))), 1)
203 $(error source directory cannot contain spaces or colons
)
206 ifneq ($(filter 3.
%,$(MAKE_VERSION
)),)
207 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
208 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
210 # Cancel implicit rules for this Makefile.
214 export abs_srctree abs_objtree
215 export sub_make_done
:= 1
217 ifeq ($(need-sub-make
),1)
219 PHONY
+= $(MAKECMDGOALS
) __sub-make
221 $(filter-out $(this-makefile
), $(MAKECMDGOALS
)) __all
: __sub-make
224 # Invoke a second make in the output directory, passing relevant variables
226 $(Q
)$(MAKE
) -C
$(abs_objtree
) -f
$(abs_srctree
)/Makefile
$(MAKECMDGOALS
)
228 endif # need-sub-make
229 endif # sub_make_done
231 # We process the rest of the Makefile if this is the final invocation of make
232 ifeq ($(need-sub-make
),)
234 # Do not print "Entering directory ...",
235 # but we want to display it when entering to the output directory
236 # so that IDEs/editors are able to understand relative filenames.
237 MAKEFLAGS
+= --no-print-directory
239 ifeq ($(abs_srctree
),$(abs_objtree
))
240 # building in the source tree
242 building_out_of_srctree
:=
244 ifeq ($(abs_srctree
)/,$(dir $(abs_objtree
)))
245 # building in a subdirectory of the source tree
248 srctree
:= $(abs_srctree
)
250 building_out_of_srctree
:= 1
253 ifneq ($(KBUILD_ABS_SRCTREE
),)
254 srctree
:= $(abs_srctree
)
260 export building_out_of_srctree srctree objtree VPATH
262 # To make sure we do not include .config for any of the *config targets
263 # catch them early, and hand them over to scripts/kconfig/Makefile
264 # It is allowed to specify more targets when calling make, including
265 # mixing *config targets and build targets.
266 # For example 'make oldconfig all'.
267 # Detect when mixed targets is specified, and make a second invocation
268 # of make so .config is not included in this case either (for *config).
270 version_h
:= include/generated
/uapi
/linux
/version.h
272 clean-targets
:= %clean mrproper cleandocs
273 no-dot-config-targets
:= $(clean-targets
) \
274 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
275 $(version_h
) headers headers_
% archheaders archscripts \
276 %asm-generic kernelversion
%src-pkg dt_binding_check \
277 outputmakefile rustavailable rustfmt rustfmtcheck
278 # Installation targets should not require compiler. Unfortunately, vdso_install
279 # is an exception where build artifacts may be updated. This must be fixed.
280 no-compiler-targets
:= $(no-dot-config-targets
) install dtbs_install \
281 headers_install modules_install kernelrelease image_name
282 no-sync-config-targets
:= $(no-dot-config-targets
) %install kernelrelease \
284 single-targets
:= %.a
%.i
%.ko
%.lds
%.ll
%.lst
%.mod
%.o
%.rsi
%.s
%.symtypes
%/
293 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
294 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
299 ifneq ($(filter $(no-compiler-targets
), $(MAKECMDGOALS
)),)
300 ifeq ($(filter-out $(no-compiler-targets
), $(MAKECMDGOALS
)),)
305 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
306 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
311 ifneq ($(KBUILD_EXTMOD
),)
315 ifeq ($(KBUILD_EXTMOD
),)
316 ifneq ($(filter %config
,$(MAKECMDGOALS
)),)
318 ifneq ($(words $(MAKECMDGOALS
)),1)
324 # We cannot build single targets and the others at the same time
325 ifneq ($(filter $(single-targets
), $(MAKECMDGOALS
)),)
327 ifneq ($(filter-out $(single-targets
), $(MAKECMDGOALS
)),)
332 # For "make -j clean all", "make -j mrproper defconfig all", etc.
333 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
334 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
339 # install and modules_install need also be processed one by one
340 ifneq ($(filter install,$(MAKECMDGOALS
)),)
341 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
347 # ===========================================================================
348 # We're called with mixed targets (*config and build targets).
349 # Handle them one by one.
351 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
353 $(MAKECMDGOALS
): __build_one_by_one
358 for i in
$(MAKECMDGOALS
); do \
359 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
364 include $(srctree
)/scripts
/Kbuild.
include
366 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
367 KERNELRELEASE
= $(call read-file
, include/config
/kernel.release
)
368 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
369 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
371 include $(srctree
)/scripts
/subarch.
include
373 # Cross compiling and selecting different set of gcc/bin-utils
374 # ---------------------------------------------------------------------------
376 # When performing cross compilation for other architectures ARCH shall be set
377 # to the target architecture. (See arch/* for the possibilities).
378 # ARCH can be set during invocation of make:
380 # Another way is to have ARCH set in the environment.
381 # The default ARCH is the host where make is executed.
383 # CROSS_COMPILE specify the prefix used for all executables used
384 # during compilation. Only gcc and related bin-utils executables
385 # are prefixed with $(CROSS_COMPILE).
386 # CROSS_COMPILE can be set on the command line
387 # make CROSS_COMPILE=ia64-linux-
388 # Alternatively CROSS_COMPILE can be set in the environment.
389 # Default value for CROSS_COMPILE is not to prefix executables
390 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
393 # Architecture as present in compile.h
394 UTS_MACHINE
:= $(ARCH
)
397 # Additional ARCH settings for x86
401 ifeq ($(ARCH
),x86_64
)
405 # Additional ARCH settings for sparc
406 ifeq ($(ARCH
),sparc32
)
409 ifeq ($(ARCH
),sparc64
)
413 # Additional ARCH settings for parisc
414 ifeq ($(ARCH
),parisc64
)
418 export cross_compiling
:=
419 ifneq ($(SRCARCH
),$(SUBARCH
))
423 KCONFIG_CONFIG ?
= .config
424 export KCONFIG_CONFIG
426 # SHELL used by kbuild
429 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
430 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
431 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
434 ifneq ($(filter %/,$(LLVM
)),)
435 LLVM_PREFIX
:= $(LLVM
)
436 else ifneq ($(filter -%,$(LLVM
)),)
437 LLVM_SUFFIX
:= $(LLVM
)
440 HOSTCC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
441 HOSTCXX
= $(LLVM_PREFIX
)clang
++$(LLVM_SUFFIX
)
447 HOSTPKG_CONFIG
= pkg-config
449 KBUILD_USERHOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes \
450 -O2
-fomit-frame-pointer
-std
=gnu11 \
451 -Wdeclaration-after-statement
452 KBUILD_USERCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(USERCFLAGS
)
453 KBUILD_USERLDFLAGS
:= $(USERLDFLAGS
)
455 # These flags apply to all Rust code in the tree, including the kernel and
457 export rust_common_flags
:= --edition
=2021 \
458 -Zbinary_dep_depinfo
=y \
459 -Dunsafe_op_in_unsafe_fn
-Drust_2018_idioms \
460 -Dunreachable_pub
-Dnon_ascii_idents \
462 -Drustdoc
::missing_crate_level_docs \
463 -Dclippy
::correctness
-Dclippy
::style \
464 -Dclippy
::suspicious
-Dclippy
::complexity \
466 -Dclippy
::let_unit_value
-Dclippy
::mut_mut \
467 -Dclippy
::needless_bitwise_bool \
468 -Dclippy
::needless_continue \
471 KBUILD_HOSTCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(HOST_LFS_CFLAGS
) $(HOSTCFLAGS
)
472 KBUILD_HOSTCXXFLAGS
:= -Wall
-O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
473 KBUILD_HOSTRUSTFLAGS
:= $(rust_common_flags
) -O
-Cstrip
=debuginfo \
474 -Zallow-features
= $(HOSTRUSTFLAGS
)
475 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
476 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
478 # Make variables (CC, etc...)
481 CC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
482 LD
= $(LLVM_PREFIX
)ld.lld
$(LLVM_SUFFIX
)
483 AR
= $(LLVM_PREFIX
)llvm-ar
$(LLVM_SUFFIX
)
484 NM
= $(LLVM_PREFIX
)llvm-nm
$(LLVM_SUFFIX
)
485 OBJCOPY
= $(LLVM_PREFIX
)llvm-objcopy
$(LLVM_SUFFIX
)
486 OBJDUMP
= $(LLVM_PREFIX
)llvm-objdump
$(LLVM_SUFFIX
)
487 READELF
= $(LLVM_PREFIX
)llvm-readelf
$(LLVM_SUFFIX
)
488 STRIP
= $(LLVM_PREFIX
)llvm-strip
$(LLVM_SUFFIX
)
490 CC
= $(CROSS_COMPILE
)gcc
491 LD
= $(CROSS_COMPILE
)ld
492 AR
= $(CROSS_COMPILE
)ar
493 NM
= $(CROSS_COMPILE
)nm
494 OBJCOPY
= $(CROSS_COMPILE
)objcopy
495 OBJDUMP
= $(CROSS_COMPILE
)objdump
496 READELF
= $(CROSS_COMPILE
)readelf
497 STRIP
= $(CROSS_COMPILE
)strip
502 CLIPPY_DRIVER
= clippy-driver
506 RESOLVE_BTFIDS
= $(objtree
)/tools
/bpf
/resolve_btfids
/resolve_btfids
510 INSTALLKERNEL
:= installkernel
524 PAHOLE_FLAGS
= $(shell PAHOLE
=$(PAHOLE
) $(srctree
)/scripts
/pahole-flags.sh
)
526 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
527 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
538 # Use USERINCLUDE when you must reference the UAPI directories only.
540 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
541 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
542 -I
$(srctree
)/include/uapi \
543 -I
$(objtree
)/include/generated
/uapi \
544 -include $(srctree
)/include/linux
/compiler-version.h \
545 -include $(srctree
)/include/linux
/kconfig.h
547 # Use LINUXINCLUDE when you must reference the include/ directory.
548 # Needed to be compatible with the O= option
550 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
551 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
552 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
553 -I
$(objtree
)/include \
556 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
557 KBUILD_CFLAGS
:= -Wall
-Wundef
-Werror
=strict-prototypes
-Wno-trigraphs \
558 -fno-strict-aliasing
-fno-common
-fshort-wchar
-fno-PIE \
559 -Werror
=implicit-function-declaration
-Werror
=implicit-int \
560 -Werror
=return-type
-Wno-format-security
-funsigned-char \
562 KBUILD_CPPFLAGS
:= -D__KERNEL__
563 KBUILD_RUSTFLAGS
:= $(rust_common_flags
) \
564 --target
=$(objtree
)/scripts
/target.json \
565 -Cpanic
=abort
-Cembed-bitcode
=n
-Clto
=n \
566 -Cforce-unwind-tables
=n
-Ccodegen-units
=1 \
567 -Csymbol-mangling-version
=v0 \
568 -Crelocation-model
=static \
569 -Zfunction-sections
=n \
570 -Dclippy
::float_arithmetic
572 KBUILD_AFLAGS_KERNEL
:=
573 KBUILD_CFLAGS_KERNEL
:=
574 KBUILD_RUSTFLAGS_KERNEL
:=
575 KBUILD_AFLAGS_MODULE
:= -DMODULE
576 KBUILD_CFLAGS_MODULE
:= -DMODULE
577 KBUILD_RUSTFLAGS_MODULE
:= --cfg MODULE
578 KBUILD_LDFLAGS_MODULE
:=
582 ifeq ($(KBUILD_CLIPPY
),1)
583 RUSTC_OR_CLIPPY_QUIET
:= CLIPPY
584 RUSTC_OR_CLIPPY
= $(CLIPPY_DRIVER
)
586 RUSTC_OR_CLIPPY_QUIET
:= RUSTC
587 RUSTC_OR_CLIPPY
= $(RUSTC
)
594 # Allows the usage of unstable features in stable compilers.
595 export RUSTC_BOOTSTRAP
:= 1
597 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
598 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
599 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
600 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
601 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
602 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
603 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
604 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
606 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
607 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
608 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
609 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
610 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
611 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
614 # Files to ignore in find ... statements
616 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
617 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
619 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
620 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
622 # ===========================================================================
623 # Rules shared between *config targets and build targets
625 # Basic helpers built in scripts/basic/
626 PHONY
+= scripts_basic
628 $(Q
)$(MAKE
) $(build
)=scripts
/basic
630 PHONY
+= outputmakefile
631 ifdef building_out_of_srctree
632 # Before starting out-of-tree build, make sure the source tree is clean.
633 # outputmakefile generates a Makefile in the output directory, if using a
634 # separate output directory. This allows convenient use of make in the
636 # At the same time when output Makefile generated, generate .gitignore to
637 # ignore whole output directory
639 quiet_cmd_makefile
= GEN Makefile
641 echo
"\# Automatically generated by $(srctree)/Makefile: don't edit"; \
642 echo
"include $(srctree)/Makefile"; \
646 @if
[ -f
$(srctree
)/.config
-o \
647 -d
$(srctree
)/include/config
-o \
648 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
650 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
651 echo
>&2 "*** in $(abs_srctree)";\
655 $(Q
)ln
-fsn
$(srctree
) source
657 $(Q
)test -e .gitignore || \
658 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
661 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
662 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
663 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
664 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
665 CC_VERSION_TEXT
= $(subst $(pound
),,$(shell LC_ALL
=C
$(CC
) --version
2>/dev
/null | head
-n
1))
667 ifneq ($(findstring clang
,$(CC_VERSION_TEXT
)),)
668 include $(srctree
)/scripts
/Makefile.clang
671 # Include this also for config targets because some architectures need
672 # cc-cross-prefix to determine CROSS_COMPILE.
674 include $(srctree
)/scripts
/Makefile.compiler
678 # ===========================================================================
679 # *config targets only - make sure prerequisites are updated, and descend
680 # in scripts/kconfig to make the *config target
682 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
683 # KBUILD_DEFCONFIG may point out an alternative default configuration
684 # used for 'make defconfig'
685 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
686 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
688 config
: outputmakefile scripts_basic FORCE
689 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
691 %config
: outputmakefile scripts_basic FORCE
692 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
695 # ===========================================================================
696 # Build targets only - this includes vmlinux, arch specific targets, clean
697 # targets and others. In general all targets except *config targets.
699 # If building an external module we do not care about the all: rule
700 # but instead __all depend on modules
702 ifeq ($(KBUILD_EXTMOD
),)
710 # Decide whether to build built-in, modular, or both.
711 # Normally, just do built-in.
716 # If we have only "make modules", don't compile built-in objects.
717 ifeq ($(MAKECMDGOALS
),modules
)
721 # If we have "make <whatever> modules", compile modules
722 # in addition to whatever we do anyway.
723 # Just "make" or "make all" shall build modules as well
725 ifneq ($(filter all modules nsdeps
%compile_commands.json clang-
%,$(MAKECMDGOALS
)),)
729 ifeq ($(MAKECMDGOALS
),)
733 export KBUILD_MODULES KBUILD_BUILTIN
736 include include/config
/auto.conf
739 ifeq ($(KBUILD_EXTMOD
),)
740 # Objects we will link into vmlinux / subdirs we need to visit
744 endif # KBUILD_EXTMOD
746 # The all: target is the default when no target is given on the
748 # This allow a user to issue only 'make' to build a kernel including modules
749 # Defaults to vmlinux, but the arch makefile usually adds further targets
752 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
753 ifdef CONFIG_CC_IS_GCC
754 CFLAGS_GCOV
+= -fno-tree-loop-im
758 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
759 ifdef CONFIG_FUNCTION_TRACER
760 CC_FLAGS_FTRACE
:= -pg
763 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
766 ifdef may-sync-config
767 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
768 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
769 # because some architectures define CROSS_COMPILE there.
770 include include/config
/auto.conf.cmd
774 @echo
>&2 '*** Configuration file "$@" not found!'
776 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
777 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
781 # The actual configuration files used during the build are stored in
782 # include/generated/ and include/config/. Update them if .config is newer than
783 # include/config/auto.conf (which mirrors .config).
785 # This exploits the 'multi-target pattern rule' trick.
786 # The syncconfig should be executed only once to make all the targets.
787 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
789 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
790 # so you cannot notice that Kconfig is waiting for the user input.
791 %/config
/auto.conf
%/config
/auto.conf.cmd
%/generated
/autoconf.h
%/generated
/rustc_cfg
: $(KCONFIG_CONFIG
)
792 $(Q
)$(kecho
) " SYNC $@"
793 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
794 else # !may-sync-config
795 # External modules and some install targets need include/generated/autoconf.h
796 # and include/config/auto.conf but do not care if they are up-to-date.
797 # Use auto.conf to trigger the test
798 PHONY
+= include/config
/auto.conf
800 include/config
/auto.conf
:
801 @
test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
803 echo
>&2 " ERROR: Kernel configuration is invalid."; \
804 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
805 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
809 endif # may-sync-config
812 KBUILD_CFLAGS
+= -fno-delete-null-pointer-checks
813 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
814 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
815 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
816 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
818 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
820 KBUILD_RUSTFLAGS
+= -Copt-level
=2
821 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
823 KBUILD_RUSTFLAGS
+= -Copt-level
=s
826 # Always set `debug-assertions` and `overflow-checks` because their default
827 # depends on `opt-level` and `debug-assertions`, respectively.
828 KBUILD_RUSTFLAGS
+= -Cdebug-assertions
=$(if
$(CONFIG_RUST_DEBUG_ASSERTIONS
),y
,n
)
829 KBUILD_RUSTFLAGS
+= -Coverflow-checks
=$(if
$(CONFIG_RUST_OVERFLOW_CHECKS
),y
,n
)
831 # Tell gcc to never replace conditional load with a non-conditional one
832 ifdef CONFIG_CC_IS_GCC
833 # gcc-10 renamed --param=allow-store-data-races=0 to
834 # -fno-allow-store-data-races.
835 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
836 KBUILD_CFLAGS
+= $(call cc-option
,-fno-allow-store-data-races
)
839 ifdef CONFIG_READABLE_ASM
840 # Disable optimizations that make assembler listings hard to read.
841 # reorder blocks reorders the control in the function
842 # ipa clone creates specialized cloned functions
843 # partial inlining inlines only parts of functions
844 KBUILD_CFLAGS
+= -fno-reorder-blocks
-fno-ipa-cp-clone
-fno-partial-inlining
847 ifneq ($(CONFIG_FRAME_WARN
),0)
848 KBUILD_CFLAGS
+= -Wframe-larger-than
=$(CONFIG_FRAME_WARN
)
851 stackp-flags-y
:= -fno-stack-protector
852 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
853 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
855 KBUILD_CFLAGS
+= $(stackp-flags-y
)
857 KBUILD_CPPFLAGS-
$(CONFIG_WERROR
) += -Werror
858 KBUILD_CPPFLAGS
+= $(KBUILD_CPPFLAGS-y
)
859 KBUILD_CFLAGS-
$(CONFIG_CC_NO_ARRAY_BOUNDS
) += -Wno-array-bounds
861 KBUILD_RUSTFLAGS-
$(CONFIG_WERROR
) += -Dwarnings
862 KBUILD_RUSTFLAGS
+= $(KBUILD_RUSTFLAGS-y
)
864 ifdef CONFIG_CC_IS_CLANG
865 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
866 KBUILD_CFLAGS
+= -Wno-gnu
869 # gcc inanely warns about local variables called 'main'
870 KBUILD_CFLAGS
+= -Wno-main
873 # These warnings generated too much noise in a regular build.
874 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
875 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
876 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
878 # These result in bogus false positives
879 KBUILD_CFLAGS
+= $(call cc-disable-warning
, dangling-pointer
)
881 ifdef CONFIG_FRAME_POINTER
882 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
883 KBUILD_RUSTFLAGS
+= -Cforce-frame-pointers
=y
885 # Some targets (ARM with Thumb2, for example), can't be built with frame
886 # pointers. For those, we don't have FUNCTION_TRACER automatically
887 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
888 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
889 # -fomit-frame-pointer with FUNCTION_TRACER.
890 # In the Rust target specification, "frame-pointer" is set explicitly
892 ifndef CONFIG_FUNCTION_TRACER
893 KBUILD_CFLAGS
+= -fomit-frame-pointer
897 # Initialize all stack variables with a 0xAA pattern.
898 ifdef CONFIG_INIT_STACK_ALL_PATTERN
899 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
902 # Initialize all stack variables with a zero value.
903 ifdef CONFIG_INIT_STACK_ALL_ZERO
904 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=zero
905 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
906 # https://github.com/llvm/llvm-project/issues/44842
907 CC_AUTO_VAR_INIT_ZERO_ENABLER
:= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
908 export CC_AUTO_VAR_INIT_ZERO_ENABLER
909 KBUILD_CFLAGS
+= $(CC_AUTO_VAR_INIT_ZERO_ENABLER
)
913 # While VLAs have been removed, GCC produces unreachable stack probes
914 # for the randomize_kstack_offset feature. Disable it for all compilers.
915 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-clash-protection
)
917 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
918 ifdef CONFIG_ZERO_CALL_USED_REGS
919 KBUILD_CFLAGS
+= -fzero-call-used-regs
=used-gpr
922 ifdef CONFIG_FUNCTION_TRACER
923 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
924 CC_FLAGS_FTRACE
+= -mrecord-mcount
925 ifdef CONFIG_HAVE_NOP_MCOUNT
926 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
927 CC_FLAGS_FTRACE
+= -mnop-mcount
928 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
932 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
933 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
934 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
937 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
938 ifdef CONFIG_HAVE_C_RECORDMCOUNT
939 BUILD_C_RECORDMCOUNT
:= y
940 export BUILD_C_RECORDMCOUNT
943 ifdef CONFIG_HAVE_FENTRY
944 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
945 ifeq ($(call cc-option-yn
, -mfentry
),y
)
946 CC_FLAGS_FTRACE
+= -mfentry
947 CC_FLAGS_USING
+= -DCC_USING_FENTRY
950 export CC_FLAGS_FTRACE
951 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
952 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
955 # We trigger additional mismatches with less inlining
956 ifdef CONFIG_DEBUG_SECTION_MISMATCH
957 KBUILD_CFLAGS
+= -fno-inline-functions-called-once
960 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
961 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
962 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
963 KBUILD_RUSTFLAGS_KERNEL
+= -Zfunction-sections
=y
964 LDFLAGS_vmlinux
+= --gc-sections
967 ifdef CONFIG_SHADOW_CALL_STACK
968 ifndef CONFIG_DYNAMIC_SCS
969 CC_FLAGS_SCS
:= -fsanitize
=shadow-call-stack
970 KBUILD_CFLAGS
+= $(CC_FLAGS_SCS
)
975 ifdef CONFIG_LTO_CLANG
976 ifdef CONFIG_LTO_CLANG_THIN
977 CC_FLAGS_LTO
:= -flto
=thin
-fsplit-lto-unit
978 KBUILD_LDFLAGS
+= --thinlto-cache-dir
=$(extmod_prefix
).thinlto-cache
980 CC_FLAGS_LTO
:= -flto
982 CC_FLAGS_LTO
+= -fvisibility
=hidden
984 # Limit inlining across translation units to reduce binary size
985 KBUILD_LDFLAGS
+= -mllvm
-import-instr-limit
=5
987 # Check for frame size exceeding threshold during prolog/epilog insertion
988 # when using lld < 13.0.0.
989 ifneq ($(CONFIG_FRAME_WARN
),0)
990 ifeq ($(call test-lt
, $(CONFIG_LLD_VERSION
), 130000),y
)
991 KBUILD_LDFLAGS
+= -plugin-opt
=-warn-stack-size
=$(CONFIG_FRAME_WARN
)
997 KBUILD_CFLAGS
+= -fno-lto
$(CC_FLAGS_LTO
)
998 KBUILD_AFLAGS
+= -fno-lto
1002 ifdef CONFIG_CFI_CLANG
1003 CC_FLAGS_CFI
:= -fsanitize
=kcfi
1004 KBUILD_CFLAGS
+= $(CC_FLAGS_CFI
)
1008 ifneq ($(CONFIG_FUNCTION_ALIGNMENT
),0)
1009 KBUILD_CFLAGS
+= -falign-functions
=$(CONFIG_FUNCTION_ALIGNMENT
)
1012 # arch Makefile may override CC so keep this after arch Makefile is included
1013 NOSTDINC_FLAGS
+= -nostdinc
1015 # warn about C99 declaration after statement
1016 KBUILD_CFLAGS
+= -Wdeclaration-after-statement
1018 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1019 KBUILD_CFLAGS
+= -Wvla
1021 # disable pointer signed / unsigned warnings in gcc 4.0
1022 KBUILD_CFLAGS
+= -Wno-pointer-sign
1024 # In order to make sure new function cast mismatches are not introduced
1025 # in the kernel (to avoid tripping CFI checking), the kernel should be
1026 # globally built with -Wcast-function-type.
1027 KBUILD_CFLAGS
+= $(call cc-option
, -Wcast-function-type
)
1029 # disable stringop warnings in gcc 8+
1030 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
1032 # We'll want to enable this eventually, but it's not going away for 5.7 at least
1033 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-overflow
)
1035 # Another good warning that we'll want to enable eventually
1036 KBUILD_CFLAGS
+= $(call cc-disable-warning
, restrict
)
1038 # Enabled with W=2, disabled by default as noisy
1039 ifdef CONFIG_CC_IS_GCC
1040 KBUILD_CFLAGS
+= -Wno-maybe-uninitialized
1043 # The allocators already balk at large sizes, so silence the compiler
1044 # warnings for bounds checks involving those possible values. While
1045 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
1046 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
1047 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1048 # doesn't work (as it is documented to), silently resolving to "0" prior to
1049 # version 9.1 (and producing an error more recently). Numeric values larger
1050 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1051 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1052 # choice, we must perform a versioned check to disable this warning.
1053 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
1054 KBUILD_CFLAGS-
$(call gcc-min-version
, 90100) += -Wno-alloc-size-larger-than
1055 KBUILD_CFLAGS
+= $(KBUILD_CFLAGS-y
) $(CONFIG_CC_IMPLICIT_FALLTHROUGH
)
1057 # disable invalid "can't wrap" optimizations for signed / pointers
1058 KBUILD_CFLAGS
+= -fno-strict-overflow
1060 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1061 KBUILD_CFLAGS
+= -fno-stack-check
1063 # conserve stack if available
1064 ifdef CONFIG_CC_IS_GCC
1065 KBUILD_CFLAGS
+= -fconserve-stack
1068 # Prohibit date/time macros, which would make the build non-deterministic
1069 KBUILD_CFLAGS
+= -Werror
=date-time
1071 # enforce correct pointer usage
1072 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
1074 # Require designated initializers for all marked structures
1075 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
1077 # change __FILE__ to the relative path from the srctree
1078 KBUILD_CPPFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
1080 # include additional Makefiles when needed
1081 include-y
:= scripts
/Makefile.extrawarn
1082 include-
$(CONFIG_DEBUG_INFO
) += scripts
/Makefile.debug
1083 include-
$(CONFIG_KASAN
) += scripts
/Makefile.kasan
1084 include-
$(CONFIG_KCSAN
) += scripts
/Makefile.kcsan
1085 include-
$(CONFIG_KMSAN
) += scripts
/Makefile.kmsan
1086 include-
$(CONFIG_UBSAN
) += scripts
/Makefile.ubsan
1087 include-
$(CONFIG_KCOV
) += scripts
/Makefile.kcov
1088 include-
$(CONFIG_RANDSTRUCT
) += scripts
/Makefile.randstruct
1089 include-
$(CONFIG_GCC_PLUGINS
) += scripts
/Makefile.gcc-plugins
1091 include $(addprefix $(srctree
)/, $(include-y
))
1093 # scripts/Makefile.gcc-plugins is intentionally included last.
1094 # Do not add $(call cc-option,...) below this line. When you build the kernel
1095 # from the clean source tree, the GCC plugins do not exist at this point.
1097 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1098 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
1099 KBUILD_AFLAGS
+= $(KAFLAGS
)
1100 KBUILD_CFLAGS
+= $(KCFLAGS
)
1101 KBUILD_RUSTFLAGS
+= $(KRUSTFLAGS
)
1103 KBUILD_LDFLAGS_MODULE
+= --build-id
=sha1
1104 LDFLAGS_vmlinux
+= --build-id
=sha1
1106 KBUILD_LDFLAGS
+= -z noexecstack
1107 ifeq ($(CONFIG_LD_IS_BFD
),y
)
1108 KBUILD_LDFLAGS
+= $(call ld-option
,--no-warn-rwx-segments
)
1111 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
1112 LDFLAGS_vmlinux
+= -X
1115 ifeq ($(CONFIG_RELR
),y
)
1116 LDFLAGS_vmlinux
+= --pack-dyn-relocs
=relr
--use-android-relr-tags
1119 # We never want expected sections to be placed heuristically by the
1120 # linker. All sections should be explicitly named in the linker script.
1121 ifdef CONFIG_LD_ORPHAN_WARN
1122 LDFLAGS_vmlinux
+= --orphan-handling
=$(CONFIG_LD_ORPHAN_WARN_LEVEL
)
1125 # Align the bit size of userspace programs with the kernel
1126 KBUILD_USERCFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1127 KBUILD_USERLDFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1129 # make the checker run with the right architecture
1130 CHECKFLAGS
+= --arch
=$(ARCH
)
1132 # insure the checker run with the right endianness
1133 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
1135 # the checker needs the correct machine size
1136 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
1138 # Default kernel image to build when no specific target is given.
1139 # KBUILD_IMAGE may be overruled on the command line or
1140 # set in the environment
1141 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1142 # this default value
1143 export KBUILD_IMAGE ?
= vmlinux
1146 # INSTALL_PATH specifies where to place the updated kernel and system map
1147 # images. Default is /boot, but you can set it to other values
1148 export INSTALL_PATH ?
= /boot
1151 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1152 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1153 # an argument if needed. Otherwise it defaults to the kernel install path
1155 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
1158 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1159 # relocations required by build roots. This is not defined in the
1160 # makefile but the argument can be passed to make if needed.
1163 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
1168 export extmod_prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
1169 export MODORDER
:= $(extmod_prefix
)modules.order
1170 export MODULES_NSDEPS
:= $(extmod_prefix
)modules.nsdeps
1172 ifeq ($(KBUILD_EXTMOD
),)
1175 clean-dirs
:= $(sort . Documentation \
1176 $(patsubst %/,%,$(filter %/, $(core-
) \
1177 $(drivers-
) $(libs-
))))
1179 export ARCH_CORE
:= $(core-y
)
1180 export ARCH_LIB
:= $(filter %/, $(libs-y
))
1181 export ARCH_DRIVERS
:= $(drivers-y
) $(drivers-m
)
1182 # Externally visible symbols (used by link-vmlinux.sh)
1184 KBUILD_VMLINUX_OBJS
:= .
/built-in.a
1185 ifdef CONFIG_MODULES
1186 KBUILD_VMLINUX_OBJS
+= $(patsubst %/, %/lib.a
, $(filter %/, $(libs-y
)))
1187 KBUILD_VMLINUX_LIBS
:= $(filter-out %/, $(libs-y
))
1189 KBUILD_VMLINUX_LIBS
:= $(patsubst %/,%/lib.a
, $(libs-y
))
1192 export KBUILD_VMLINUX_LIBS
1193 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1195 # Recurse until adjust_autoksyms.sh is satisfied
1196 PHONY
+= autoksyms_recursive
1197 ifdef CONFIG_TRIM_UNUSED_KSYMS
1198 # For the kernel to actually contain only the needed exported symbols,
1199 # we have to build modules as well to determine what those symbols are.
1200 # (this can be evaluated only once include/config/auto.conf has been included)
1203 autoksyms_recursive
: $(build-dir
) modules.order
1204 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1205 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1208 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1210 quiet_cmd_autoksyms_h
= GEN
$@
1211 cmd_autoksyms_h
= mkdir
-p
$(dir $@
); \
1212 $(CONFIG_SHELL
) $(srctree
)/scripts
/gen_autoksyms.sh
$@
1215 $(call cmd
,autoksyms_h
)
1217 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1218 quiet_cmd_ar_vmlinux.a
= AR
$@
1219 cmd_ar_vmlinux.a
= \
1221 $(AR
) cDPrST
$@
$(KBUILD_VMLINUX_OBJS
); \
1222 $(AR
) mPiT
$$($(AR
) t
$@ | sed
-n
1p
) $@
$$($(AR
) t
$@ | grep
-F
-f
$(srctree
)/scripts
/head-object-list.txt
)
1224 targets
+= vmlinux.a
1225 vmlinux.a
: $(KBUILD_VMLINUX_OBJS
) scripts
/head-object-list.txt autoksyms_recursive FORCE
1226 $(call if_changed
,ar_vmlinux.a
)
1229 vmlinux_o
: vmlinux.a
$(KBUILD_VMLINUX_LIBS
)
1230 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux_o
1232 vmlinux.o modules.builtin.modinfo modules.builtin
: vmlinux_o
1236 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1237 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1238 # unrelated; the decompressors just happen to have the same base name,
1239 # arch/*/boot/compressed/vmlinux.
1240 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1242 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1243 # https://savannah.gnu.org/bugs/?61463
1244 # For Make > 4.4, the following simple code will work:
1245 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1246 vmlinux
: private _LDFLAGS_vmlinux
:= $(LDFLAGS_vmlinux
)
1247 vmlinux
: export LDFLAGS_vmlinux
= $(_LDFLAGS_vmlinux
)
1248 vmlinux
: vmlinux.o
$(KBUILD_LDS
) modpost
1249 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux
1251 # The actual objects are generated when descending,
1252 # make sure no implicit rule kicks in
1253 $(sort $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)): .
;
1255 ifeq ($(origin KERNELRELEASE
),file
)
1256 filechk_kernel.release
= $(srctree
)/scripts
/setlocalversion
$(srctree
)
1258 filechk_kernel.release
= echo
$(KERNELRELEASE
)
1261 # Store (new) KERNELRELEASE string in include/config/kernel.release
1262 include/config
/kernel.release
: FORCE
1263 $(call filechk
,kernel.release
)
1265 # Additional helpers built in scripts/
1266 # Carefully list dependencies so we do not try to build scripts twice
1269 scripts
: scripts_basic scripts_dtc
1270 $(Q
)$(MAKE
) $(build
)=$(@
)
1272 # Things we need to do before we recursively start building the kernel
1273 # or the modules are listed in "prepare".
1274 # A multi level approach is used. prepareN is processed before prepareN-1.
1275 # archprepare is used in arch Makefiles and when processed asm symlink,
1276 # version.h and scripts_basic is processed / created.
1278 PHONY
+= prepare archprepare
1280 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1281 asm-generic
$(version_h
) $(autoksyms_h
) include/generated
/utsrelease.h \
1282 include/generated
/compile.h
include/generated
/autoconf.h remove-stale-files
1284 prepare0
: archprepare
1285 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1286 $(Q
)$(MAKE
) $(build
)=. prepare
1288 # All the preparing..
1291 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
-v
1292 $(Q
)$(MAKE
) $(build
)=rust
1295 PHONY
+= remove-stale-files
1297 $(Q
)$(srctree
)/scripts
/remove-stale-files
1299 # Support for using generic headers in asm-generic
1300 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1302 PHONY
+= asm-generic uapi-asm-generic
1303 asm-generic
: uapi-asm-generic
1304 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1305 generic
=include/asm-generic
1307 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1308 generic
=include/uapi
/asm-generic
1310 # Generate some files
1311 # ---------------------------------------------------------------------------
1313 # KERNELRELEASE can change from a few different places, meaning version.h
1314 # needs to be updated, so this check is forced on all builds
1317 define filechk_utsrelease.h
1318 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1319 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1322 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1325 define filechk_version.h
1326 if
[ $(SUBLEVEL
) -gt
255 ]; then \
1327 echo \
#define LINUX_VERSION_CODE $(shell \
1328 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + 255); \
1330 echo \
#define LINUX_VERSION_CODE $(shell \
1331 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
1333 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1334 ((c) > 255 ? 255 : (c)))'; \
1335 echo \
#define LINUX_VERSION_MAJOR $(VERSION); \
1336 echo \
#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1337 echo \
#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1340 $(version_h
): PATCHLEVEL
:= $(or
$(PATCHLEVEL
), 0)
1341 $(version_h
): SUBLEVEL
:= $(or
$(SUBLEVEL
), 0)
1343 $(call filechk
,version.h
)
1345 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1346 $(call filechk
,utsrelease.h
)
1348 filechk_compile.h
= $(srctree
)/scripts
/mkcompile_h \
1349 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1351 include/generated
/compile.h
: FORCE
1352 $(call filechk
,compile.h
)
1356 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1357 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1359 # ---------------------------------------------------------------------------
1362 #Default location for installed headers
1363 export INSTALL_HDR_PATH
= $(objtree
)/usr
1365 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1366 cmd_headers_install
= \
1367 mkdir
-p
$(INSTALL_HDR_PATH
); \
1368 rsync
-mrl
--include='*/' --include='*\.h' --exclude
='*' \
1369 usr
/include $(INSTALL_HDR_PATH
)
1371 PHONY
+= headers_install
1372 headers_install
: headers
1373 $(call cmd
,headers_install
)
1375 PHONY
+= archheaders archscripts
1377 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1380 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1381 $(if
$(filter um
, $(SRCARCH
)), $(error Headers not exportable for UML
))
1382 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1383 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1385 ifdef CONFIG_HEADERS_INSTALL
1389 PHONY
+= scripts_unifdef
1390 scripts_unifdef
: scripts_basic
1391 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1393 # ---------------------------------------------------------------------------
1396 # Many distributions have the custom install script, /sbin/installkernel.
1397 # If DKMS is installed, 'make install' will eventually recurse back
1398 # to this Makefile to build and install external modules.
1399 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1401 quiet_cmd_install
= INSTALL
$(INSTALL_PATH
)
1402 cmd_install
= unset sub_make_done
; $(srctree
)/scripts
/install.sh
1404 # ---------------------------------------------------------------------------
1407 ifdef CONFIG_OBJTOOL
1408 prepare
: tools
/objtool
1412 ifdef CONFIG_DEBUG_INFO_BTF
1413 prepare
: tools
/bpf
/resolve_btfids
1417 PHONY
+= resolve_btfids_clean
1419 resolve_btfids_O
= $(abspath
$(objtree
))/tools
/bpf
/resolve_btfids
1421 # tools/bpf/resolve_btfids directory might not exist
1422 # in output directory, skip its clean in that case
1423 resolve_btfids_clean
:
1424 ifneq ($(wildcard $(resolve_btfids_O
)),)
1425 $(Q
)$(MAKE
) -sC
$(srctree
)/tools
/bpf
/resolve_btfids O
=$(resolve_btfids_O
) clean
1428 # Clear a bunch of variables before executing the submake
1429 ifeq ($(quiet
),silent_
)
1434 $(Q
)mkdir
-p
$(objtree
)/tools
1435 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1438 $(Q
)mkdir
-p
$(objtree
)/tools
1439 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1441 # ---------------------------------------------------------------------------
1446 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1448 kselftest-
%: headers FORCE
1449 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1451 PHONY
+= kselftest-merge
1453 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1454 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config | \
1455 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-m
$(objtree
)/.config
1456 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1458 # ---------------------------------------------------------------------------
1461 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1462 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1468 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1470 %.dtbo
: dtbs_prepare
1471 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1473 PHONY
+= dtbs dtbs_prepare dtbs_install dtbs_check
1475 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1477 # include/config/kernel.release is actually needed when installing DTBs because
1478 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1479 # dtbs_install depend on it as dtbs_install may run as root.
1480 dtbs_prepare
: include/config
/kernel.release scripts_dtc
1482 ifneq ($(filter dtbs_check
, $(MAKECMDGOALS
)),)
1486 ifneq ($(CHECK_DTBS
),)
1487 dtbs_prepare
: dt_binding_check
1493 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
) dst
=$(INSTALL_DTBS_PATH
)
1495 ifdef CONFIG_OF_EARLY_FLATTREE
1501 PHONY
+= scripts_dtc
1502 scripts_dtc
: scripts_basic
1503 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1505 ifneq ($(filter dt_binding_check
, $(MAKECMDGOALS
)),)
1506 export CHECK_DT_BINDING
=y
1509 PHONY
+= dt_binding_check
1510 dt_binding_check
: scripts_dtc
1511 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1513 PHONY
+= dt_compatible_check
1514 dt_compatible_check
: dt_binding_check
1515 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
$@
1517 # ---------------------------------------------------------------------------
1520 ifdef CONFIG_MODULES
1522 # By default, build modules as well
1526 # When we're building modules with modversions, we need to consider
1527 # the built-in objects during the descend as well, in order to
1528 # make sure the checksums are up to date before we record them.
1529 ifdef CONFIG_MODVERSIONS
1536 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1538 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1543 modules
: modules_prepare
1545 # Target to prepare building external modules
1546 modules_prepare
: prepare
1547 $(Q
)$(MAKE
) $(build
)=scripts scripts
/module.lds
1549 export modules_sign_only
:=
1551 ifeq ($(CONFIG_MODULE_SIG
),y
)
1552 PHONY
+= modules_sign
1553 modules_sign
: modules_install
1556 # modules_sign is a subset of modules_install.
1557 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1558 ifeq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1559 modules_sign_only
:= y
1564 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1565 modinst_pre
:= __modinst_pre
1568 modules_install
: $(modinst_pre
)
1569 PHONY
+= __modinst_pre
1571 @
rm -rf
$(MODLIB
)/kernel
1572 @
rm -f
$(MODLIB
)/source
1573 @mkdir
-p
$(MODLIB
)/kernel
1574 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1575 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1576 rm -f
$(MODLIB
)/build
; \
1577 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1579 @sed
's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order
> $(MODLIB
)/modules.order
1580 @cp
-f modules.builtin
$(MODLIB
)/
1581 @cp
-f
$(objtree
)/modules.builtin.modinfo
$(MODLIB
)/
1583 endif # CONFIG_MODULES
1586 # Cleaning is done on three levels.
1587 # make clean Delete most generated files
1588 # Leave enough to build external modules
1589 # make mrproper Delete the current configuration, and all generated files
1590 # make distclean Remove editor backup files, patch leftover files and the like
1592 # Directories & files removed with 'make clean'
1593 CLEAN_FILES
+= include/ksym vmlinux.symvers modules-only.symvers \
1594 modules.builtin modules.builtin.modinfo modules.nsdeps \
1595 compile_commands.json .thinlto-cache rust
/test rust
/doc \
1596 rust-project.json .vmlinux.objs .vmlinux.
export.c
1598 # Directories & files removed with 'make mrproper'
1599 MRPROPER_FILES
+= include/config
include/generated \
1600 arch
/$(SRCARCH
)/include/generated .objdiff \
1601 debian snap tar-install \
1602 .config .config.old .version \
1604 certs
/signing_key.pem \
1610 # clean - Delete most, but leave enough to build external modules
1612 clean: rm-files
:= $(CLEAN_FILES
)
1614 PHONY
+= archclean vmlinuxclean
1617 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1618 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1620 clean: archclean vmlinuxclean resolve_btfids_clean
1622 # mrproper - Delete all generated files, including .config
1624 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1625 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1627 PHONY
+= $(mrproper-dirs
) mrproper
1629 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1631 mrproper
: clean $(mrproper-dirs
)
1633 @find .
$(RCS_FIND_IGNORE
) \
1634 \
( -name
'*.rmeta' \
) \
1635 -type f
-print | xargs
rm -f
1642 @find .
$(RCS_FIND_IGNORE
) \
1643 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1644 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1645 -o
-name
'core' -o
-name
tags -o
-name TAGS
-o
-name
'cscope*' \
1646 -o
-name GPATH
-o
-name GRTAGS
-o
-name GSYMS
-o
-name GTAGS \
) \
1647 -type f
-print | xargs
rm -f
1650 # Packaging of the kernel to various formats
1651 # ---------------------------------------------------------------------------
1654 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1655 %pkg
: include/config
/kernel.release FORCE
1656 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1658 # Brief documentation of the typical targets used
1659 # ---------------------------------------------------------------------------
1661 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1662 boards
:= $(sort $(notdir $(boards
)))
1663 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1664 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1668 @echo
'Cleaning targets:'
1669 @echo
' clean - Remove most generated files but keep the config and'
1670 @echo
' enough build support to build external modules'
1671 @echo
' mrproper - Remove all generated files + config + various backup files'
1672 @echo
' distclean - mrproper + remove editor backup and patch files'
1674 @echo
'Configuration targets:'
1675 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1677 @echo
'Other generic targets:'
1678 @echo
' all - Build all targets marked with [*]'
1679 @echo
'* vmlinux - Build the bare kernel'
1680 @echo
'* modules - Build all modules'
1681 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1682 @echo
' dir/ - Build all files in dir and below'
1683 @echo
' dir/file.[ois] - Build specified target only'
1684 @echo
' dir/file.ll - Build the LLVM assembly file'
1685 @echo
' (requires compiler support for LLVM assembly generation)'
1686 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1687 @echo
' (requires a recent binutils and recent build (System.map))'
1688 @echo
' dir/file.ko - Build module including final link'
1689 @echo
' modules_prepare - Set up for building external modules'
1690 @echo
' tags/TAGS - Generate tags file for editors'
1691 @echo
' cscope - Generate cscope index'
1692 @echo
' gtags - Generate GNU GLOBAL index'
1693 @echo
' kernelrelease - Output the release version string (use with make -s)'
1694 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1695 @echo
' image_name - Output the image name (use with make -s)'
1696 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1697 echo
' (default: $(INSTALL_HDR_PATH))'; \
1699 @echo
'Static analysers:'
1700 @echo
' checkstack - Generate a list of stack hogs'
1701 @echo
' versioncheck - Sanity check on version.h usage'
1702 @echo
' includecheck - Check for duplicate included header files'
1703 @echo
' export_report - List the usages of all exported symbols'
1704 @echo
' headerdep - Detect inclusion cycles in headers'
1705 @echo
' coccicheck - Check with Coccinelle'
1706 @echo
' clang-analyzer - Check with clang static analyzer'
1707 @echo
' clang-tidy - Check with clang-tidy'
1710 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1712 @echo
'Kernel selftest:'
1713 @echo
' kselftest - Build and run kernel selftest'
1714 @echo
' Build, install, and boot kernel before'
1715 @echo
' running kselftest on it'
1716 @echo
' Run as root for full coverage'
1717 @echo
' kselftest-all - Build kernel selftest'
1718 @echo
' kselftest-install - Build and install kernel selftest'
1719 @echo
' kselftest-clean - Remove all generated kselftest files'
1720 @echo
' kselftest-merge - Merge all the config dependencies of'
1721 @echo
' kselftest to existing .config.'
1723 @echo
'Rust targets:'
1724 @echo
' rustavailable - Checks whether the Rust toolchain is'
1725 @echo
' available and, if not, explains why.'
1726 @echo
' rustfmt - Reformat all the Rust code in the kernel'
1727 @echo
' rustfmtcheck - Checks if all the Rust code in the kernel'
1728 @echo
' is formatted, printing a diff otherwise.'
1729 @echo
' rustdoc - Generate Rust documentation'
1730 @echo
' (requires kernel .config)'
1731 @echo
' rusttest - Runs the Rust tests'
1732 @echo
' (requires kernel .config; downloads external repos)'
1733 @echo
' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1734 @echo
' (requires kernel .config)'
1735 @echo
' dir/file.[os] - Build specified target only'
1736 @echo
' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1737 @echo
' Run with RUSTFMT=n to skip reformatting if needed.'
1738 @echo
' The output is not intended to be compilable.'
1739 @echo
' dir/file.ll - Build the LLVM assembly file'
1742 echo
'Devicetree:'; \
1743 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1744 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1745 echo
' dt_binding_check - Validate device tree binding documents'; \
1746 echo
' dtbs_check - Validate device tree source files';\
1749 @echo
'Userspace tools targets:'
1750 @echo
' use "make tools/help"'
1751 @echo
' or "cd tools; make help"'
1753 @echo
'Kernel packaging:'
1754 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1756 @echo
'Documentation targets:'
1757 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1759 @echo
'Architecture specific targets ($(SRCARCH)):'
1761 echo
' No architecture specific help defined for $(SRCARCH)')
1764 $(foreach b
, $(boards
), \
1765 printf
" %-27s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1767 @
$(if
$(board-dirs
), \
1768 $(foreach b
, $(board-dirs
), \
1769 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1770 printf
" %-16s - Show all of the above\\n" help-boards
; \
1773 @echo
' make V=n [targets] 1: verbose build'
1774 @echo
' 2: give reason for rebuild of target'
1775 @echo
' V=1 and V=2 can be combined with V=12'
1776 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1777 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK'
1778 @echo
' (sparse by default)'
1779 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1780 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1781 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1782 @echo
' 1: warnings which may be relevant and do not occur too often'
1783 @echo
' 2: warnings which occur quite often but may still be relevant'
1784 @echo
' 3: more obscure warnings, can most likely be ignored'
1785 @echo
' e: warnings are being treated as errors'
1786 @echo
' Multiple levels can be combined with W=12 or W=123'
1788 echo
' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1789 echo
' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1792 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1793 @echo
'For further info see the ./README file'
1796 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1798 help-boards
: $(help-board-dirs
)
1800 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1802 $(help-board-dirs
): help-
%:
1803 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1804 @
$(if
$(boards-per-dir
), \
1805 $(foreach b
, $(boards-per-dir
), \
1806 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1810 # Documentation targets
1811 # ---------------------------------------------------------------------------
1812 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1813 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1814 PHONY
+= $(DOC_TARGETS
)
1816 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1820 # ---------------------------------------------------------------------------
1822 # "Is Rust available?" target
1823 PHONY
+= rustavailable
1825 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
-v
&& echo
"Rust is available!"
1827 # Documentation target
1829 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1832 $(Q
)$(MAKE
) $(build
)=rust
$@
1837 $(Q
)$(MAKE
) $(build
)=rust
$@
1839 # Formatting targets
1840 PHONY
+= rustfmt rustfmtcheck
1842 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1844 # We match using absolute paths since `find` does not resolve them
1845 # when matching, which is a problem when e.g. `srctree` is `..`.
1846 # We `grep` afterwards in order to remove the directory entry itself.
1848 $(Q
)find
$(abs_srctree
) -type f
-name
'*.rs' \
1849 -o
-path
$(abs_srctree
)/rust
/alloc
-prune \
1850 -o
-path
$(abs_objtree
)/rust
/test -prune \
1851 | grep
-Fv
$(abs_srctree
)/rust
/alloc \
1852 | grep
-Fv
$(abs_objtree
)/rust
/test \
1853 | grep
-Fv generated \
1854 | xargs
$(RUSTFMT
) $(rustfmt_flags
)
1856 rustfmtcheck
: rustfmt_flags
= --check
1857 rustfmtcheck
: rustfmt
1859 # IDE support targets
1860 PHONY
+= rust-analyzer
1862 $(Q
)$(MAKE
) $(build
)=rust
$@
1865 # ---------------------------------------------------------------------------
1869 $(Q
)$(srctree
)/scripts
/misc-check
1873 PHONY
+= scripts_gdb
1874 scripts_gdb
: prepare0
1875 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1876 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1878 ifdef CONFIG_GDB_SCRIPTS
1882 else # KBUILD_EXTMOD
1884 filechk_kernel.release
= echo
$(KERNELRELEASE
)
1887 # External module support.
1888 # When building external modules the kernel used as basis is considered
1889 # read-only, and no consistency checks are made and the make
1890 # system is not used on the basis kernel. If updates are required
1891 # in the basis kernel ordinary make commands (without M=...) must be used.
1893 # We are always building only modules.
1897 build-dir
:= $(KBUILD_EXTMOD
)
1899 compile_commands.json
: $(extmod_prefix
)compile_commands.json
1900 PHONY
+= compile_commands.json
1902 clean-dirs
:= $(KBUILD_EXTMOD
)
1903 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
$(KBUILD_EXTMOD
)/modules.nsdeps \
1904 $(KBUILD_EXTMOD
)/compile_commands.json
$(KBUILD_EXTMOD
)/.thinlto-cache
1907 # now expand this into a simple variable to reduce the cost of shell evaluations
1908 prepare
: CC_VERSION_TEXT
:= $(CC_VERSION_TEXT
)
1910 @if
[ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1911 echo
>&2 "warning: the compiler differs from the one used to build the kernel"; \
1912 echo
>&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1913 echo
>&2 " You are using: $(CC_VERSION_TEXT)"; \
1918 @echo
' Building external modules.'
1919 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1921 @echo
' modules - default target, build the module(s)'
1922 @echo
' modules_install - install the module'
1923 @echo
' clean - remove generated files in module directory only'
1926 endif # KBUILD_EXTMOD
1928 # ---------------------------------------------------------------------------
1931 PHONY
+= modules modules_install modules_prepare
1933 ifdef CONFIG_MODULES
1935 $(MODORDER
): $(build-dir
)
1938 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1939 # This is solely useful to speed up test compiles.
1941 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
1942 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
1945 PHONY
+= modules_check
1946 modules_check
: $(MODORDER
)
1947 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
$<
1949 quiet_cmd_depmod
= DEPMOD
$(MODLIB
)
1950 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1954 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1957 else # CONFIG_MODULES
1959 # Modules not configured
1960 # ---------------------------------------------------------------------------
1962 modules modules_install
:
1964 @echo
>&2 '*** The present kernel configuration has modules disabled.'
1965 @echo
>&2 '*** To use the module feature, please run "make menuconfig" etc.'
1966 @echo
>&2 '*** to enable CONFIG_MODULES.'
1972 endif # CONFIG_MODULES
1975 modpost
: $(if
$(single-build
),, $(if
$(KBUILD_BUILTIN
), vmlinux.o
)) \
1976 $(if
$(KBUILD_MODULES
), modules_check
)
1977 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1980 # ---------------------------------------------------------------------------
1981 # To build individual files in subdirectories, you can do like this:
1983 # make foo/bar/baz.s
1985 # The supported suffixes for single-target are listed in 'single-targets'
1987 # To build only under specific subdirectories, you can do like this:
1993 # .ko is special because modpost is needed
1994 single-ko
:= $(sort $(filter %.ko
, $(MAKECMDGOALS
)))
1995 single-no-ko
:= $(filter-out $(single-ko
), $(MAKECMDGOALS
)) \
1996 $(foreach x
, o mod
, $(patsubst %.ko
, %.
$x, $(single-ko
)))
1998 $(single-ko
): single_modules
2000 $(single-no-ko
): $(build-dir
)
2003 # Remove MODORDER when done because it is not the real one.
2004 PHONY
+= single_modules
2005 single_modules
: $(single-no-ko
) modules_prepare
2006 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod_prefix
)$(m
:%.ko
=%.o
);) } > $(MODORDER
)
2007 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
2008 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
2009 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
2011 $(Q
)rm -f
$(MODORDER
)
2013 single-goals
:= $(addprefix $(build-dir
)/, $(single-no-ko
))
2019 # Preset locale variables to speed up the build process. Limit locale
2020 # tweaks to this spot to avoid wrong language settings when running
2021 # make menuconfig etc.
2022 # Error messages still appears in the original language
2023 PHONY
+= $(build-dir
)
2024 $(build-dir
): prepare
2025 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1 need-modorder
=1 $(single-goals
)
2027 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
2028 PHONY
+= $(clean-dirs
) clean
2030 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
2032 clean: $(clean-dirs
)
2034 @find
$(or
$(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
2035 \
( -name
'*.[aios]' -o
-name
'*.rsi' -o
-name
'*.ko' -o
-name
'.*.cmd' \
2037 -o
-name
'*.dtb' -o
-name
'*.dtbo' \
2038 -o
-name
'*.dtb.S' -o
-name
'*.dtbo.S' \
2039 -o
-name
'*.dt.yaml' \
2040 -o
-name
'*.dwo' -o
-name
'*.lst' \
2041 -o
-name
'*.su' -o
-name
'*.mod' -o
-name
'*.usyms' \
2042 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
2043 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
2044 -o
-name
'*.asn1.[ch]' \
2045 -o
-name
'*.symtypes' -o
-name
'modules.order' \
2046 -o
-name
'*.c.[012]*.*' \
2049 -o
-name
'*.*.symversions' \
) -type f
-print \
2050 -o
-name
'.tmp_*' -print \
2053 # Generate tags for editors
2054 # ---------------------------------------------------------------------------
2055 quiet_cmd_tags
= GEN
$@
2056 cmd_tags
= $(BASH
) $(srctree
)/scripts
/tags.sh
$@
2058 tags TAGS cscope gtags
: FORCE
2061 # Script to generate missing namespace dependencies
2062 # ---------------------------------------------------------------------------
2065 nsdeps
: export KBUILD_NSDEPS
=1
2067 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/nsdeps
2070 # ---------------------------------------------------------------------------
2072 quiet_cmd_gen_compile_commands
= GEN
$@
2073 cmd_gen_compile_commands
= $(PYTHON3
) $< -a
$(AR
) -o
$@
$(filter-out $<, $(real-prereqs
))
2075 $(extmod_prefix
)compile_commands.json
: scripts
/clang-tools
/gen_compile_commands.py \
2076 $(if
$(KBUILD_EXTMOD
),, vmlinux.a
$(KBUILD_VMLINUX_LIBS
)) \
2077 $(if
$(CONFIG_MODULES
), $(MODORDER
)) FORCE
2078 $(call if_changed
,gen_compile_commands
)
2080 targets
+= $(extmod_prefix
)compile_commands.json
2082 PHONY
+= clang-tidy clang-analyzer
2084 ifdef CONFIG_CC_IS_CLANG
2085 quiet_cmd_clang_tools
= CHECK
$<
2086 cmd_clang_tools
= $(PYTHON3
) $(srctree
)/scripts
/clang-tools
/run-clang-tools.py
$@
$<
2088 clang-tidy clang-analyzer
: $(extmod_prefix
)compile_commands.json
2089 $(call cmd
,clang_tools
)
2091 clang-tidy clang-analyzer
:
2092 @echo
"$@ requires CC=clang" >&2
2096 # Scripts to check various things for consistency
2097 # ---------------------------------------------------------------------------
2099 PHONY
+= includecheck versioncheck coccicheck export_report
2102 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
2103 -name
'*.[hcS]' -type f
-print |
sort \
2104 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
2107 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
2108 -name
'*.[hcS]' -type f
-print |
sort \
2109 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
2112 $(Q
)$(BASH
) $(srctree
)/scripts
/$@
2115 $(PERL
) $(srctree
)/scripts
/export_report.pl
2117 PHONY
+= checkstack kernelrelease kernelversion image_name
2119 # UML needs a little special treatment here. It wants to use the host
2120 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2121 # else wants $(ARCH), including people doing cross-builds, which means
2122 # that $(SUBARCH) doesn't work here.
2124 CHECKSTACK_ARCH
:= $(SUBARCH
)
2126 CHECKSTACK_ARCH
:= $(ARCH
)
2129 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
2130 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
2133 @
$(filechk_kernel.release
)
2136 @echo
$(KERNELVERSION
)
2139 @echo
$(KBUILD_IMAGE
)
2141 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
2142 cmd_rmfiles
= rm -rf
$(rm-files
)
2144 # read saved command lines for existing targets
2145 existing-targets
:= $(wildcard $(sort $(targets
)))
2147 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
2149 endif # config-build
2151 endif # need-sub-make
2156 # Declare the contents of the PHONY variable as phony. We keep that
2157 # information in a variable so we can use it in if_changed and friends.