1 # SPDX-License-Identifier: GPL-2.0
6 NAME
= Hurr durr I
'ma ninja sloth
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 ifeq ($(filter undefine,$(.FEATURES)),)
15 $(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION))
18 $(if $(filter __%, $(MAKECMDGOALS)), \
19 $(error targets prefixed with '__
' are only for internal use))
21 # That's our default target when none is given on the command line
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.a targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 this-makefile
:= $(lastword
$(MAKEFILE_LIST
))
42 export abs_srctree
:= $(realpath
$(dir $(this-makefile
)))
43 export abs_objtree
:= $(CURDIR
)
45 ifneq ($(sub_make_done
),1)
47 # Do not use make's built-in rules and variables
48 # (this increases performance and avoids hard-to-debug behaviour)
51 # Avoid funny character set dependencies
55 export LC_COLLATE LC_NUMERIC
57 # Avoid interference with shell env settings
61 # ---------------------------------------------------------------------------
63 # Most of build commands in Kbuild start with "cmd_". You can optionally define
64 # "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
65 # that command is printed by default.
68 # quiet_cmd_depmod = DEPMOD $(MODLIB)
69 # cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
71 # A simple variant is to prefix commands with $(Q) - that's useful
72 # for commands that shall be hidden in non-verbose mode.
74 # $(Q)$(MAKE) $(build)=scripts/basic
76 # If KBUILD_VERBOSE contains 1, the whole command is echoed.
77 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
79 # To put more focus on warnings, be less verbose as default
80 # Use 'make V=1' to see the full commands
82 ifeq ("$(origin V)", "command line")
89 ifneq ($(findstring 1, $(KBUILD_VERBOSE
)),)
94 # If the user is running make -s (silent mode), suppress echoing of
96 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
98 ifeq ($(filter 3.
%,$(MAKE_VERSION
)),)
99 short-opts
:= $(firstword -$(MAKEFLAGS
))
101 short-opts
:= $(filter-out --%,$(MAKEFLAGS
))
104 ifneq ($(findstring s
,$(short-opts
)),)
106 override KBUILD_VERBOSE
:=
109 export quiet Q KBUILD_VERBOSE
111 # Call a source code checker (by default, "sparse") as part of the
114 # Use 'make C=1' to enable checking of only re-compiled files.
115 # Use 'make C=2' to enable checking of *all* source files, regardless
116 # of whether they are re-compiled or not.
118 # See the file "Documentation/dev-tools/sparse.rst" for more details,
119 # including where to get the "sparse" utility.
121 ifeq ("$(origin C)", "command line")
122 KBUILD_CHECKSRC
= $(C
)
124 ifndef KBUILD_CHECKSRC
128 export KBUILD_CHECKSRC
130 # Enable "clippy" (a linter) as part of the Rust compilation.
132 # Use 'make CLIPPY=1' to enable it.
133 ifeq ("$(origin CLIPPY)", "command line")
134 KBUILD_CLIPPY
:= $(CLIPPY
)
139 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
140 # directory of external module to build. Setting M= takes precedence.
141 ifeq ("$(origin M)", "command line")
142 KBUILD_EXTMOD
:= $(M
)
145 $(if
$(word 2, $(KBUILD_EXTMOD
)), \
146 $(error building multiple external modules is not supported
))
148 $(foreach x
, % :, $(if
$(findstring $x, $(KBUILD_EXTMOD
)), \
149 $(error module directory path cannot contain
'$x')))
151 # Remove trailing slashes
152 ifneq ($(filter %/, $(KBUILD_EXTMOD
)),)
153 KBUILD_EXTMOD
:= $(shell dirname
$(KBUILD_EXTMOD
).
)
158 # Kbuild will save output files in the current working directory.
159 # This does not need to match to the root of the kernel source tree.
161 # For example, you can do this:
163 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
165 # If you want to save output files in a different location, there are
166 # two syntaxes to specify it.
169 # Use "make O=dir/to/store/output/files/"
171 # 2) Set KBUILD_OUTPUT
172 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
173 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
175 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
178 # Do we want to change the working directory?
179 ifeq ("$(origin O)", "command line")
180 KBUILD_OUTPUT
:= $(O
)
183 ifneq ($(KBUILD_OUTPUT
),)
184 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
185 # expand a shell special character '~'. We use a somewhat tedious way here.
186 abs_objtree
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) && pwd
)
187 $(if
$(abs_objtree
),, \
188 $(error failed to create output directory
"$(KBUILD_OUTPUT)"))
190 # $(realpath ...) resolves symlinks
191 abs_objtree
:= $(realpath
$(abs_objtree
))
192 endif # ifneq ($(KBUILD_OUTPUT),)
194 ifneq ($(words $(subst :, ,$(abs_srctree
))), 1)
195 $(error source directory cannot contain spaces or colons
)
198 ifneq ($(filter 3.
%,$(MAKE_VERSION
)),)
199 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
200 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
202 # Cancel implicit rules for this Makefile.
206 export sub_make_done
:= 1
208 endif # sub_make_done
210 ifeq ($(abs_objtree
),$(CURDIR
))
211 # Suppress "Entering directory ..." if we are at the final work directory.
212 no-print-directory
:= --no-print-directory
214 # Recursion to show "Entering directory ..."
218 ifeq ($(filter --no-print-directory
, $(MAKEFLAGS
)),)
219 # If --no-print-directory is unset, recurse once again to set it.
220 # You may end up recursing into __sub-make twice. This is needed due to the
221 # behavior change in GNU Make 4.4.1.
225 ifeq ($(need-sub-make
),1)
227 PHONY
+= $(MAKECMDGOALS
) __sub-make
229 $(filter-out $(this-makefile
), $(MAKECMDGOALS
)) __all
: __sub-make
232 # Invoke a second make in the output directory, passing relevant variables
234 $(Q
)$(MAKE
) $(no-print-directory
) -C
$(abs_objtree
) \
235 -f
$(abs_srctree
)/Makefile
$(MAKECMDGOALS
)
239 # We process the rest of the Makefile if this is the final invocation of make
241 ifeq ($(abs_srctree
),$(abs_objtree
))
242 # building in the source tree
244 building_out_of_srctree
:=
246 ifeq ($(abs_srctree
)/,$(dir $(abs_objtree
)))
247 # building in a subdirectory of the source tree
250 srctree
:= $(abs_srctree
)
252 building_out_of_srctree
:= 1
255 ifneq ($(KBUILD_ABS_SRCTREE
),)
256 srctree
:= $(abs_srctree
)
262 export building_out_of_srctree srctree objtree VPATH
264 # To make sure we do not include .config for any of the *config targets
265 # catch them early, and hand them over to scripts/kconfig/Makefile
266 # It is allowed to specify more targets when calling make, including
267 # mixing *config targets and build targets.
268 # For example 'make oldconfig all'.
269 # Detect when mixed targets is specified, and make a second invocation
270 # of make so .config is not included in this case either (for *config).
272 version_h
:= include/generated
/uapi
/linux
/version.h
274 clean-targets
:= %clean mrproper cleandocs
275 no-dot-config-targets
:= $(clean-targets
) \
276 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
277 $(version_h
) headers headers_
% archheaders archscripts \
278 %asm-generic kernelversion
%src-pkg dt_binding_check \
279 outputmakefile rustavailable rustfmt rustfmtcheck
280 # Installation targets should not require compiler. Unfortunately, vdso_install
281 # is an exception where build artifacts may be updated. This must be fixed.
282 no-compiler-targets
:= $(no-dot-config-targets
) install dtbs_install \
283 headers_install modules_install kernelrelease image_name
284 no-sync-config-targets
:= $(no-dot-config-targets
) %install kernelrelease \
286 single-targets
:= %.a
%.i
%.ko
%.lds
%.ll
%.lst
%.mod
%.o
%.rsi
%.s
%.symtypes
%/
295 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
296 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
301 ifneq ($(filter $(no-compiler-targets
), $(MAKECMDGOALS
)),)
302 ifeq ($(filter-out $(no-compiler-targets
), $(MAKECMDGOALS
)),)
307 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
308 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
313 ifneq ($(KBUILD_EXTMOD
),)
317 ifeq ($(KBUILD_EXTMOD
),)
318 ifneq ($(filter %config
,$(MAKECMDGOALS
)),)
320 ifneq ($(words $(MAKECMDGOALS
)),1)
326 # We cannot build single targets and the others at the same time
327 ifneq ($(filter $(single-targets
), $(MAKECMDGOALS
)),)
329 ifneq ($(filter-out $(single-targets
), $(MAKECMDGOALS
)),)
334 # For "make -j clean all", "make -j mrproper defconfig all", etc.
335 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
336 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
341 # install and modules_install need also be processed one by one
342 ifneq ($(filter install,$(MAKECMDGOALS
)),)
343 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
349 # ===========================================================================
350 # We're called with mixed targets (*config and build targets).
351 # Handle them one by one.
353 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
355 $(MAKECMDGOALS
): __build_one_by_one
360 for i in
$(MAKECMDGOALS
); do \
361 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
366 include $(srctree
)/scripts
/Kbuild.
include
368 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
369 KERNELRELEASE
= $(call read-file
, include/config
/kernel.release
)
370 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
371 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
373 include $(srctree
)/scripts
/subarch.
include
375 # Cross compiling and selecting different set of gcc/bin-utils
376 # ---------------------------------------------------------------------------
378 # When performing cross compilation for other architectures ARCH shall be set
379 # to the target architecture. (See arch/* for the possibilities).
380 # ARCH can be set during invocation of make:
382 # Another way is to have ARCH set in the environment.
383 # The default ARCH is the host where make is executed.
385 # CROSS_COMPILE specify the prefix used for all executables used
386 # during compilation. Only gcc and related bin-utils executables
387 # are prefixed with $(CROSS_COMPILE).
388 # CROSS_COMPILE can be set on the command line
389 # make CROSS_COMPILE=ia64-linux-
390 # Alternatively CROSS_COMPILE can be set in the environment.
391 # Default value for CROSS_COMPILE is not to prefix executables
392 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
395 # Architecture as present in compile.h
396 UTS_MACHINE
:= $(ARCH
)
399 # Additional ARCH settings for x86
403 ifeq ($(ARCH
),x86_64
)
407 # Additional ARCH settings for sparc
408 ifeq ($(ARCH
),sparc32
)
411 ifeq ($(ARCH
),sparc64
)
415 # Additional ARCH settings for parisc
416 ifeq ($(ARCH
),parisc64
)
420 export cross_compiling
:=
421 ifneq ($(SRCARCH
),$(SUBARCH
))
425 KCONFIG_CONFIG ?
= .config
426 export KCONFIG_CONFIG
428 # SHELL used by kbuild
431 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
432 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
433 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
436 ifneq ($(filter %/,$(LLVM
)),)
437 LLVM_PREFIX
:= $(LLVM
)
438 else ifneq ($(filter -%,$(LLVM
)),)
439 LLVM_SUFFIX
:= $(LLVM
)
442 HOSTCC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
443 HOSTCXX
= $(LLVM_PREFIX
)clang
++$(LLVM_SUFFIX
)
449 HOSTPKG_CONFIG
= pkg-config
451 KBUILD_USERHOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes \
452 -O2
-fomit-frame-pointer
-std
=gnu11
453 KBUILD_USERCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(USERCFLAGS
)
454 KBUILD_USERLDFLAGS
:= $(USERLDFLAGS
)
456 # These flags apply to all Rust code in the tree, including the kernel and
458 export rust_common_flags
:= --edition
=2021 \
459 -Zbinary_dep_depinfo
=y \
460 -Dunsafe_op_in_unsafe_fn
-Drust_2018_idioms \
461 -Dunreachable_pub
-Dnon_ascii_idents \
463 -Drustdoc
::missing_crate_level_docs \
464 -Dclippy
::correctness
-Dclippy
::style \
465 -Dclippy
::suspicious
-Dclippy
::complexity \
467 -Dclippy
::let_unit_value
-Dclippy
::mut_mut \
468 -Dclippy
::needless_bitwise_bool \
469 -Dclippy
::needless_continue \
472 KBUILD_HOSTCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(HOST_LFS_CFLAGS
) $(HOSTCFLAGS
)
473 KBUILD_HOSTCXXFLAGS
:= -Wall
-O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
474 KBUILD_HOSTRUSTFLAGS
:= $(rust_common_flags
) -O
-Cstrip
=debuginfo \
475 -Zallow-features
= $(HOSTRUSTFLAGS
)
476 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
477 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
479 # Make variables (CC, etc...)
482 CC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
483 LD
= $(LLVM_PREFIX
)ld.lld
$(LLVM_SUFFIX
)
484 AR
= $(LLVM_PREFIX
)llvm-ar
$(LLVM_SUFFIX
)
485 NM
= $(LLVM_PREFIX
)llvm-nm
$(LLVM_SUFFIX
)
486 OBJCOPY
= $(LLVM_PREFIX
)llvm-objcopy
$(LLVM_SUFFIX
)
487 OBJDUMP
= $(LLVM_PREFIX
)llvm-objdump
$(LLVM_SUFFIX
)
488 READELF
= $(LLVM_PREFIX
)llvm-readelf
$(LLVM_SUFFIX
)
489 STRIP
= $(LLVM_PREFIX
)llvm-strip
$(LLVM_SUFFIX
)
491 CC
= $(CROSS_COMPILE
)gcc
492 LD
= $(CROSS_COMPILE
)ld
493 AR
= $(CROSS_COMPILE
)ar
494 NM
= $(CROSS_COMPILE
)nm
495 OBJCOPY
= $(CROSS_COMPILE
)objcopy
496 OBJDUMP
= $(CROSS_COMPILE
)objdump
497 READELF
= $(CROSS_COMPILE
)readelf
498 STRIP
= $(CROSS_COMPILE
)strip
503 CLIPPY_DRIVER
= clippy-driver
507 RESOLVE_BTFIDS
= $(objtree
)/tools
/bpf
/resolve_btfids
/resolve_btfids
511 INSTALLKERNEL
:= installkernel
525 PAHOLE_FLAGS
= $(shell PAHOLE
=$(PAHOLE
) $(srctree
)/scripts
/pahole-flags.sh
)
527 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
528 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
539 # Use USERINCLUDE when you must reference the UAPI directories only.
541 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
542 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
543 -I
$(srctree
)/include/uapi \
544 -I
$(objtree
)/include/generated
/uapi \
545 -include $(srctree
)/include/linux
/compiler-version.h \
546 -include $(srctree
)/include/linux
/kconfig.h
548 # Use LINUXINCLUDE when you must reference the include/ directory.
549 # Needed to be compatible with the O= option
551 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
552 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
553 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
554 -I
$(objtree
)/include \
557 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
560 KBUILD_CFLAGS
+= -std
=gnu11
561 KBUILD_CFLAGS
+= -fshort-wchar
562 KBUILD_CFLAGS
+= -funsigned-char
563 KBUILD_CFLAGS
+= -fno-common
564 KBUILD_CFLAGS
+= -fno-PIE
565 KBUILD_CFLAGS
+= -fno-strict-aliasing
566 KBUILD_CFLAGS
+= -Wall
567 KBUILD_CFLAGS
+= -Wundef
568 KBUILD_CFLAGS
+= -Werror
=implicit-function-declaration
569 KBUILD_CFLAGS
+= -Werror
=implicit-int
570 KBUILD_CFLAGS
+= -Werror
=return-type
571 KBUILD_CFLAGS
+= -Werror
=strict-prototypes
572 KBUILD_CFLAGS
+= -Wno-format-security
573 KBUILD_CFLAGS
+= -Wno-trigraphs
575 KBUILD_CPPFLAGS
:= -D__KERNEL__
576 KBUILD_RUSTFLAGS
:= $(rust_common_flags
) \
577 --target
=$(objtree
)/scripts
/target.json \
578 -Cpanic
=abort
-Cembed-bitcode
=n
-Clto
=n \
579 -Cforce-unwind-tables
=n
-Ccodegen-units
=1 \
580 -Csymbol-mangling-version
=v0 \
581 -Crelocation-model
=static \
582 -Zfunction-sections
=n \
583 -Dclippy
::float_arithmetic
585 KBUILD_AFLAGS_KERNEL
:=
586 KBUILD_CFLAGS_KERNEL
:=
587 KBUILD_RUSTFLAGS_KERNEL
:=
588 KBUILD_AFLAGS_MODULE
:= -DMODULE
589 KBUILD_CFLAGS_MODULE
:= -DMODULE
590 KBUILD_RUSTFLAGS_MODULE
:= --cfg MODULE
591 KBUILD_LDFLAGS_MODULE
:=
595 ifeq ($(KBUILD_CLIPPY
),1)
596 RUSTC_OR_CLIPPY_QUIET
:= CLIPPY
597 RUSTC_OR_CLIPPY
= $(CLIPPY_DRIVER
)
599 RUSTC_OR_CLIPPY_QUIET
:= RUSTC
600 RUSTC_OR_CLIPPY
= $(RUSTC
)
607 # Allows the usage of unstable features in stable compilers.
608 export RUSTC_BOOTSTRAP
:= 1
610 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
611 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
612 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
613 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
614 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
615 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
616 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
617 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
619 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
620 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
621 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
622 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
623 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
624 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
627 # Files to ignore in find ... statements
629 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
630 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
632 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
633 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
635 # ===========================================================================
636 # Rules shared between *config targets and build targets
638 # Basic helpers built in scripts/basic/
639 PHONY
+= scripts_basic
641 $(Q
)$(MAKE
) $(build
)=scripts
/basic
643 PHONY
+= outputmakefile
644 ifdef building_out_of_srctree
645 # Before starting out-of-tree build, make sure the source tree is clean.
646 # outputmakefile generates a Makefile in the output directory, if using a
647 # separate output directory. This allows convenient use of make in the
649 # At the same time when output Makefile generated, generate .gitignore to
650 # ignore whole output directory
652 quiet_cmd_makefile
= GEN Makefile
654 echo
"\# Automatically generated by $(srctree)/Makefile: don't edit"; \
655 echo
"include $(srctree)/Makefile"; \
659 @if
[ -f
$(srctree
)/.config
-o \
660 -d
$(srctree
)/include/config
-o \
661 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
663 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
664 echo
>&2 "*** in $(abs_srctree)";\
668 $(Q
)ln
-fsn
$(srctree
) source
670 $(Q
)test -e .gitignore || \
671 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
674 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
675 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
676 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
677 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
678 CC_VERSION_TEXT
= $(subst $(pound
),,$(shell LC_ALL
=C
$(CC
) --version
2>/dev
/null | head
-n
1))
680 ifneq ($(findstring clang
,$(CC_VERSION_TEXT
)),)
681 include $(srctree
)/scripts
/Makefile.clang
684 # Include this also for config targets because some architectures need
685 # cc-cross-prefix to determine CROSS_COMPILE.
687 include $(srctree
)/scripts
/Makefile.compiler
691 # ===========================================================================
692 # *config targets only - make sure prerequisites are updated, and descend
693 # in scripts/kconfig to make the *config target
695 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
696 # KBUILD_DEFCONFIG may point out an alternative default configuration
697 # used for 'make defconfig'
698 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
699 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
701 config
: outputmakefile scripts_basic FORCE
702 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
704 %config
: outputmakefile scripts_basic FORCE
705 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
708 # ===========================================================================
709 # Build targets only - this includes vmlinux, arch specific targets, clean
710 # targets and others. In general all targets except *config targets.
712 # If building an external module we do not care about the all: rule
713 # but instead __all depend on modules
715 ifeq ($(KBUILD_EXTMOD
),)
723 # Decide whether to build built-in, modular, or both.
724 # Normally, just do built-in.
729 # If we have only "make modules", don't compile built-in objects.
730 ifeq ($(MAKECMDGOALS
),modules
)
734 # If we have "make <whatever> modules", compile modules
735 # in addition to whatever we do anyway.
736 # Just "make" or "make all" shall build modules as well
738 ifneq ($(filter all modules nsdeps
%compile_commands.json clang-
%,$(MAKECMDGOALS
)),)
742 ifeq ($(MAKECMDGOALS
),)
746 export KBUILD_MODULES KBUILD_BUILTIN
749 include include/config
/auto.conf
752 ifeq ($(KBUILD_EXTMOD
),)
753 # Objects we will link into vmlinux / subdirs we need to visit
757 endif # KBUILD_EXTMOD
759 # The all: target is the default when no target is given on the
761 # This allow a user to issue only 'make' to build a kernel including modules
762 # Defaults to vmlinux, but the arch makefile usually adds further targets
765 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
766 ifdef CONFIG_CC_IS_GCC
767 CFLAGS_GCOV
+= -fno-tree-loop-im
771 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
772 ifdef CONFIG_FUNCTION_TRACER
773 CC_FLAGS_FTRACE
:= -pg
776 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
779 ifdef may-sync-config
780 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
781 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
782 # because some architectures define CROSS_COMPILE there.
783 include include/config
/auto.conf.cmd
787 @echo
>&2 '*** Configuration file "$@" not found!'
789 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
790 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
794 # The actual configuration files used during the build are stored in
795 # include/generated/ and include/config/. Update them if .config is newer than
796 # include/config/auto.conf (which mirrors .config).
798 # This exploits the 'multi-target pattern rule' trick.
799 # The syncconfig should be executed only once to make all the targets.
800 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
802 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
803 # so you cannot notice that Kconfig is waiting for the user input.
804 %/config
/auto.conf
%/config
/auto.conf.cmd
%/generated
/autoconf.h
%/generated
/rustc_cfg
: $(KCONFIG_CONFIG
)
805 $(Q
)$(kecho
) " SYNC $@"
806 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
807 else # !may-sync-config
808 # External modules and some install targets need include/generated/autoconf.h
809 # and include/config/auto.conf but do not care if they are up-to-date.
810 # Use auto.conf to trigger the test
811 PHONY
+= include/config
/auto.conf
813 include/config
/auto.conf
:
814 @
test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
816 echo
>&2 " ERROR: Kernel configuration is invalid."; \
817 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
818 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
822 endif # may-sync-config
825 KBUILD_CFLAGS
+= -fno-delete-null-pointer-checks
826 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
827 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
828 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
829 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
831 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
833 KBUILD_RUSTFLAGS
+= -Copt-level
=2
834 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
836 KBUILD_RUSTFLAGS
+= -Copt-level
=s
839 # Always set `debug-assertions` and `overflow-checks` because their default
840 # depends on `opt-level` and `debug-assertions`, respectively.
841 KBUILD_RUSTFLAGS
+= -Cdebug-assertions
=$(if
$(CONFIG_RUST_DEBUG_ASSERTIONS
),y
,n
)
842 KBUILD_RUSTFLAGS
+= -Coverflow-checks
=$(if
$(CONFIG_RUST_OVERFLOW_CHECKS
),y
,n
)
844 # Tell gcc to never replace conditional load with a non-conditional one
845 ifdef CONFIG_CC_IS_GCC
846 # gcc-10 renamed --param=allow-store-data-races=0 to
847 # -fno-allow-store-data-races.
848 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
849 KBUILD_CFLAGS
+= $(call cc-option
,-fno-allow-store-data-races
)
852 ifdef CONFIG_READABLE_ASM
853 # Disable optimizations that make assembler listings hard to read.
854 # reorder blocks reorders the control in the function
855 # ipa clone creates specialized cloned functions
856 # partial inlining inlines only parts of functions
857 KBUILD_CFLAGS
+= -fno-reorder-blocks
-fno-ipa-cp-clone
-fno-partial-inlining
860 ifneq ($(CONFIG_FRAME_WARN
),0)
861 KBUILD_CFLAGS
+= -Wframe-larger-than
=$(CONFIG_FRAME_WARN
)
864 stackp-flags-y
:= -fno-stack-protector
865 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
866 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
868 KBUILD_CFLAGS
+= $(stackp-flags-y
)
870 KBUILD_CPPFLAGS-
$(CONFIG_WERROR
) += -Werror
871 KBUILD_CPPFLAGS
+= $(KBUILD_CPPFLAGS-y
)
872 KBUILD_CFLAGS-
$(CONFIG_CC_NO_ARRAY_BOUNDS
) += -Wno-array-bounds
874 KBUILD_RUSTFLAGS-
$(CONFIG_WERROR
) += -Dwarnings
875 KBUILD_RUSTFLAGS
+= $(KBUILD_RUSTFLAGS-y
)
877 ifdef CONFIG_CC_IS_CLANG
878 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
879 KBUILD_CFLAGS
+= -Wno-gnu
882 # gcc inanely warns about local variables called 'main'
883 KBUILD_CFLAGS
+= -Wno-main
886 # These warnings generated too much noise in a regular build.
887 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
888 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
889 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
891 # These result in bogus false positives
892 KBUILD_CFLAGS
+= $(call cc-disable-warning
, dangling-pointer
)
894 ifdef CONFIG_FRAME_POINTER
895 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
896 KBUILD_RUSTFLAGS
+= -Cforce-frame-pointers
=y
898 # Some targets (ARM with Thumb2, for example), can't be built with frame
899 # pointers. For those, we don't have FUNCTION_TRACER automatically
900 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
901 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
902 # -fomit-frame-pointer with FUNCTION_TRACER.
903 # In the Rust target specification, "frame-pointer" is set explicitly
905 ifndef CONFIG_FUNCTION_TRACER
906 KBUILD_CFLAGS
+= -fomit-frame-pointer
910 # Initialize all stack variables with a 0xAA pattern.
911 ifdef CONFIG_INIT_STACK_ALL_PATTERN
912 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
915 # Initialize all stack variables with a zero value.
916 ifdef CONFIG_INIT_STACK_ALL_ZERO
917 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=zero
918 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
919 # https://github.com/llvm/llvm-project/issues/44842
920 CC_AUTO_VAR_INIT_ZERO_ENABLER
:= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
921 export CC_AUTO_VAR_INIT_ZERO_ENABLER
922 KBUILD_CFLAGS
+= $(CC_AUTO_VAR_INIT_ZERO_ENABLER
)
926 # While VLAs have been removed, GCC produces unreachable stack probes
927 # for the randomize_kstack_offset feature. Disable it for all compilers.
928 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-clash-protection
)
930 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
931 ifdef CONFIG_ZERO_CALL_USED_REGS
932 KBUILD_CFLAGS
+= -fzero-call-used-regs
=used-gpr
935 ifdef CONFIG_FUNCTION_TRACER
936 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
937 CC_FLAGS_FTRACE
+= -mrecord-mcount
938 ifdef CONFIG_HAVE_NOP_MCOUNT
939 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
940 CC_FLAGS_FTRACE
+= -mnop-mcount
941 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
945 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
946 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
947 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
950 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
951 ifdef CONFIG_HAVE_C_RECORDMCOUNT
952 BUILD_C_RECORDMCOUNT
:= y
953 export BUILD_C_RECORDMCOUNT
956 ifdef CONFIG_HAVE_FENTRY
957 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
958 ifeq ($(call cc-option-yn
, -mfentry
),y
)
959 CC_FLAGS_FTRACE
+= -mfentry
960 CC_FLAGS_USING
+= -DCC_USING_FENTRY
963 export CC_FLAGS_FTRACE
964 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
965 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
968 # We trigger additional mismatches with less inlining
969 ifdef CONFIG_DEBUG_SECTION_MISMATCH
970 KBUILD_CFLAGS
+= -fno-inline-functions-called-once
973 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
974 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
975 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
976 KBUILD_RUSTFLAGS_KERNEL
+= -Zfunction-sections
=y
977 LDFLAGS_vmlinux
+= --gc-sections
980 ifdef CONFIG_SHADOW_CALL_STACK
981 ifndef CONFIG_DYNAMIC_SCS
982 CC_FLAGS_SCS
:= -fsanitize
=shadow-call-stack
983 KBUILD_CFLAGS
+= $(CC_FLAGS_SCS
)
988 ifdef CONFIG_LTO_CLANG
989 ifdef CONFIG_LTO_CLANG_THIN
990 CC_FLAGS_LTO
:= -flto
=thin
-fsplit-lto-unit
991 KBUILD_LDFLAGS
+= --thinlto-cache-dir
=$(extmod_prefix
).thinlto-cache
993 CC_FLAGS_LTO
:= -flto
995 CC_FLAGS_LTO
+= -fvisibility
=hidden
997 # Limit inlining across translation units to reduce binary size
998 KBUILD_LDFLAGS
+= -mllvm
-import-instr-limit
=5
1000 # Check for frame size exceeding threshold during prolog/epilog insertion
1001 # when using lld < 13.0.0.
1002 ifneq ($(CONFIG_FRAME_WARN
),0)
1003 ifeq ($(call test-lt
, $(CONFIG_LLD_VERSION
), 130000),y
)
1004 KBUILD_LDFLAGS
+= -plugin-opt
=-warn-stack-size
=$(CONFIG_FRAME_WARN
)
1010 KBUILD_CFLAGS
+= -fno-lto
$(CC_FLAGS_LTO
)
1011 KBUILD_AFLAGS
+= -fno-lto
1015 ifdef CONFIG_CFI_CLANG
1016 CC_FLAGS_CFI
:= -fsanitize
=kcfi
1017 KBUILD_CFLAGS
+= $(CC_FLAGS_CFI
)
1021 ifneq ($(CONFIG_FUNCTION_ALIGNMENT
),0)
1022 KBUILD_CFLAGS
+= -falign-functions
=$(CONFIG_FUNCTION_ALIGNMENT
)
1025 # arch Makefile may override CC so keep this after arch Makefile is included
1026 NOSTDINC_FLAGS
+= -nostdinc
1028 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1029 KBUILD_CFLAGS
+= -Wvla
1031 # disable pointer signed / unsigned warnings in gcc 4.0
1032 KBUILD_CFLAGS
+= -Wno-pointer-sign
1034 # In order to make sure new function cast mismatches are not introduced
1035 # in the kernel (to avoid tripping CFI checking), the kernel should be
1036 # globally built with -Wcast-function-type.
1037 KBUILD_CFLAGS
+= $(call cc-option
, -Wcast-function-type
)
1039 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
1040 # the kernel uses only C99 flexible arrays for dynamically sized trailing
1041 # arrays. Enforce this for everything that may examine structure sizes and
1042 # perform bounds checking.
1043 KBUILD_CFLAGS
+= $(call cc-option
, -fstrict-flex-arrays
=3)
1045 # disable stringop warnings in gcc 8+
1046 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
1048 # We'll want to enable this eventually, but it's not going away for 5.7 at least
1049 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-overflow
)
1051 # Another good warning that we'll want to enable eventually
1052 KBUILD_CFLAGS
+= $(call cc-disable-warning
, restrict
)
1054 # Enabled with W=2, disabled by default as noisy
1055 ifdef CONFIG_CC_IS_GCC
1056 KBUILD_CFLAGS
+= -Wno-maybe-uninitialized
1059 # The allocators already balk at large sizes, so silence the compiler
1060 # warnings for bounds checks involving those possible values. While
1061 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
1062 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
1063 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1064 # doesn't work (as it is documented to), silently resolving to "0" prior to
1065 # version 9.1 (and producing an error more recently). Numeric values larger
1066 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1067 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1068 # choice, we must perform a versioned check to disable this warning.
1069 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
1070 KBUILD_CFLAGS-
$(call gcc-min-version
, 90100) += -Wno-alloc-size-larger-than
1071 KBUILD_CFLAGS
+= $(KBUILD_CFLAGS-y
) $(CONFIG_CC_IMPLICIT_FALLTHROUGH
)
1073 # disable invalid "can't wrap" optimizations for signed / pointers
1074 KBUILD_CFLAGS
+= -fno-strict-overflow
1076 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1077 KBUILD_CFLAGS
+= -fno-stack-check
1079 # conserve stack if available
1080 ifdef CONFIG_CC_IS_GCC
1081 KBUILD_CFLAGS
+= -fconserve-stack
1084 # Prohibit date/time macros, which would make the build non-deterministic
1085 KBUILD_CFLAGS
+= -Werror
=date-time
1087 # enforce correct pointer usage
1088 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
1090 # Require designated initializers for all marked structures
1091 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
1093 # change __FILE__ to the relative path from the srctree
1094 KBUILD_CPPFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
1096 # include additional Makefiles when needed
1097 include-y
:= scripts
/Makefile.extrawarn
1098 include-
$(CONFIG_DEBUG_INFO
) += scripts
/Makefile.debug
1099 include-
$(CONFIG_KASAN
) += scripts
/Makefile.kasan
1100 include-
$(CONFIG_KCSAN
) += scripts
/Makefile.kcsan
1101 include-
$(CONFIG_KMSAN
) += scripts
/Makefile.kmsan
1102 include-
$(CONFIG_UBSAN
) += scripts
/Makefile.ubsan
1103 include-
$(CONFIG_KCOV
) += scripts
/Makefile.kcov
1104 include-
$(CONFIG_RANDSTRUCT
) += scripts
/Makefile.randstruct
1105 include-
$(CONFIG_GCC_PLUGINS
) += scripts
/Makefile.gcc-plugins
1107 include $(addprefix $(srctree
)/, $(include-y
))
1109 # scripts/Makefile.gcc-plugins is intentionally included last.
1110 # Do not add $(call cc-option,...) below this line. When you build the kernel
1111 # from the clean source tree, the GCC plugins do not exist at this point.
1113 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1114 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
1115 KBUILD_AFLAGS
+= $(KAFLAGS
)
1116 KBUILD_CFLAGS
+= $(KCFLAGS
)
1117 KBUILD_RUSTFLAGS
+= $(KRUSTFLAGS
)
1119 KBUILD_LDFLAGS_MODULE
+= --build-id
=sha1
1120 LDFLAGS_vmlinux
+= --build-id
=sha1
1122 KBUILD_LDFLAGS
+= -z noexecstack
1123 ifeq ($(CONFIG_LD_IS_BFD
),y
)
1124 KBUILD_LDFLAGS
+= $(call ld-option
,--no-warn-rwx-segments
)
1127 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
1128 LDFLAGS_vmlinux
+= -X
1131 ifeq ($(CONFIG_RELR
),y
)
1132 # ld.lld before 15 did not support -z pack-relative-relocs.
1133 LDFLAGS_vmlinux
+= $(call ld-option
,--pack-dyn-relocs
=relr
,-z pack-relative-relocs
)
1136 # We never want expected sections to be placed heuristically by the
1137 # linker. All sections should be explicitly named in the linker script.
1138 ifdef CONFIG_LD_ORPHAN_WARN
1139 LDFLAGS_vmlinux
+= --orphan-handling
=$(CONFIG_LD_ORPHAN_WARN_LEVEL
)
1142 # Align the bit size of userspace programs with the kernel
1143 KBUILD_USERCFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1144 KBUILD_USERLDFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1146 # make the checker run with the right architecture
1147 CHECKFLAGS
+= --arch
=$(ARCH
)
1149 # insure the checker run with the right endianness
1150 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
1152 # the checker needs the correct machine size
1153 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
1155 # Default kernel image to build when no specific target is given.
1156 # KBUILD_IMAGE may be overruled on the command line or
1157 # set in the environment
1158 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1159 # this default value
1160 export KBUILD_IMAGE ?
= vmlinux
1163 # INSTALL_PATH specifies where to place the updated kernel and system map
1164 # images. Default is /boot, but you can set it to other values
1165 export INSTALL_PATH ?
= /boot
1168 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1169 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1170 # an argument if needed. Otherwise it defaults to the kernel install path
1172 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
1175 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1176 # relocations required by build roots. This is not defined in the
1177 # makefile but the argument can be passed to make if needed.
1180 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
1185 export extmod_prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
1186 export MODORDER
:= $(extmod_prefix
)modules.order
1187 export MODULES_NSDEPS
:= $(extmod_prefix
)modules.nsdeps
1189 ifeq ($(KBUILD_EXTMOD
),)
1192 clean-dirs
:= $(sort . Documentation \
1193 $(patsubst %/,%,$(filter %/, $(core-
) \
1194 $(drivers-
) $(libs-
))))
1196 export ARCH_CORE
:= $(core-y
)
1197 export ARCH_LIB
:= $(filter %/, $(libs-y
))
1198 export ARCH_DRIVERS
:= $(drivers-y
) $(drivers-m
)
1199 # Externally visible symbols (used by link-vmlinux.sh)
1201 KBUILD_VMLINUX_OBJS
:= .
/built-in.a
1202 ifdef CONFIG_MODULES
1203 KBUILD_VMLINUX_OBJS
+= $(patsubst %/, %/lib.a
, $(filter %/, $(libs-y
)))
1204 KBUILD_VMLINUX_LIBS
:= $(filter-out %/, $(libs-y
))
1206 KBUILD_VMLINUX_LIBS
:= $(patsubst %/,%/lib.a
, $(libs-y
))
1209 export KBUILD_VMLINUX_LIBS
1210 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
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.
1218 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1219 quiet_cmd_ar_vmlinux.a
= AR
$@
1220 cmd_ar_vmlinux.a
= \
1222 $(AR
) cDPrST
$@
$(KBUILD_VMLINUX_OBJS
); \
1223 $(AR
) mPiT
$$($(AR
) t
$@ | sed
-n
1p
) $@
$$($(AR
) t
$@ | grep
-F
-f
$(srctree
)/scripts
/head-object-list.txt
)
1225 targets
+= vmlinux.a
1226 vmlinux.a
: $(KBUILD_VMLINUX_OBJS
) scripts
/head-object-list.txt FORCE
1227 $(call if_changed
,ar_vmlinux.a
)
1230 vmlinux_o
: vmlinux.a
$(KBUILD_VMLINUX_LIBS
)
1231 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux_o
1233 vmlinux.o modules.builtin.modinfo modules.builtin
: vmlinux_o
1237 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1238 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1239 # unrelated; the decompressors just happen to have the same base name,
1240 # arch/*/boot/compressed/vmlinux.
1241 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1243 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1244 # https://savannah.gnu.org/bugs/?61463
1245 # For Make > 4.4, the following simple code will work:
1246 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1247 vmlinux
: private _LDFLAGS_vmlinux
:= $(LDFLAGS_vmlinux
)
1248 vmlinux
: export LDFLAGS_vmlinux
= $(_LDFLAGS_vmlinux
)
1249 vmlinux
: vmlinux.o
$(KBUILD_LDS
) modpost
1250 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux
1252 # The actual objects are generated when descending,
1253 # make sure no implicit rule kicks in
1254 $(sort $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)): .
;
1256 ifeq ($(origin KERNELRELEASE
),file
)
1257 filechk_kernel.release
= $(srctree
)/scripts
/setlocalversion
$(srctree
)
1259 filechk_kernel.release
= echo
$(KERNELRELEASE
)
1262 # Store (new) KERNELRELEASE string in include/config/kernel.release
1263 include/config
/kernel.release
: FORCE
1264 $(call filechk
,kernel.release
)
1266 # Additional helpers built in scripts/
1267 # Carefully list dependencies so we do not try to build scripts twice
1270 scripts
: scripts_basic scripts_dtc
1271 $(Q
)$(MAKE
) $(build
)=$(@
)
1273 # Things we need to do before we recursively start building the kernel
1274 # or the modules are listed in "prepare".
1275 # A multi level approach is used. prepareN is processed before prepareN-1.
1276 # archprepare is used in arch Makefiles and when processed asm symlink,
1277 # version.h and scripts_basic is processed / created.
1279 PHONY
+= prepare archprepare
1281 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1282 asm-generic
$(version_h
) include/generated
/utsrelease.h \
1283 include/generated
/compile.h
include/generated
/autoconf.h remove-stale-files
1285 prepare0
: archprepare
1286 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1287 $(Q
)$(MAKE
) $(build
)=. prepare
1289 # All the preparing..
1292 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
-v
1293 $(Q
)$(MAKE
) $(build
)=rust
1296 PHONY
+= remove-stale-files
1298 $(Q
)$(srctree
)/scripts
/remove-stale-files
1300 # Support for using generic headers in asm-generic
1301 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1303 PHONY
+= asm-generic uapi-asm-generic
1304 asm-generic
: uapi-asm-generic
1305 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1306 generic
=include/asm-generic
1308 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1309 generic
=include/uapi
/asm-generic
1311 # Generate some files
1312 # ---------------------------------------------------------------------------
1314 # KERNELRELEASE can change from a few different places, meaning version.h
1315 # needs to be updated, so this check is forced on all builds
1318 define filechk_utsrelease.h
1319 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1320 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1323 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1326 define filechk_version.h
1327 if
[ $(SUBLEVEL
) -gt
255 ]; then \
1328 echo \
#define LINUX_VERSION_CODE $(shell \
1329 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + 255); \
1331 echo \
#define LINUX_VERSION_CODE $(shell \
1332 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
1334 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1335 ((c) > 255 ? 255 : (c)))'; \
1336 echo \
#define LINUX_VERSION_MAJOR $(VERSION); \
1337 echo \
#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1338 echo \
#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1341 $(version_h
): PATCHLEVEL
:= $(or
$(PATCHLEVEL
), 0)
1342 $(version_h
): SUBLEVEL
:= $(or
$(SUBLEVEL
), 0)
1344 $(call filechk
,version.h
)
1346 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1347 $(call filechk
,utsrelease.h
)
1349 filechk_compile.h
= $(srctree
)/scripts
/mkcompile_h \
1350 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1352 include/generated
/compile.h
: FORCE
1353 $(call filechk
,compile.h
)
1357 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1358 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1360 # ---------------------------------------------------------------------------
1363 #Default location for installed headers
1364 export INSTALL_HDR_PATH
= $(objtree
)/usr
1366 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1367 cmd_headers_install
= \
1368 mkdir
-p
$(INSTALL_HDR_PATH
); \
1369 rsync
-mrl
--include='*/' --include='*\.h' --exclude
='*' \
1370 usr
/include $(INSTALL_HDR_PATH
)
1372 PHONY
+= headers_install
1373 headers_install
: headers
1374 $(call cmd
,headers_install
)
1376 PHONY
+= archheaders archscripts
1378 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1381 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1382 $(if
$(filter um
, $(SRCARCH
)), $(error Headers not exportable for UML
))
1383 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1384 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1386 ifdef CONFIG_HEADERS_INSTALL
1390 PHONY
+= scripts_unifdef
1391 scripts_unifdef
: scripts_basic
1392 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1394 # ---------------------------------------------------------------------------
1397 # Many distributions have the custom install script, /sbin/installkernel.
1398 # If DKMS is installed, 'make install' will eventually recurse back
1399 # to this Makefile to build and install external modules.
1400 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1402 quiet_cmd_install
= INSTALL
$(INSTALL_PATH
)
1403 cmd_install
= unset sub_make_done
; $(srctree
)/scripts
/install.sh
1405 # ---------------------------------------------------------------------------
1408 ifdef CONFIG_OBJTOOL
1409 prepare
: tools
/objtool
1413 ifdef CONFIG_DEBUG_INFO_BTF
1414 prepare
: tools
/bpf
/resolve_btfids
1418 PHONY
+= resolve_btfids_clean
1420 resolve_btfids_O
= $(abspath
$(objtree
))/tools
/bpf
/resolve_btfids
1422 # tools/bpf/resolve_btfids directory might not exist
1423 # in output directory, skip its clean in that case
1424 resolve_btfids_clean
:
1425 ifneq ($(wildcard $(resolve_btfids_O
)),)
1426 $(Q
)$(MAKE
) -sC
$(srctree
)/tools
/bpf
/resolve_btfids O
=$(resolve_btfids_O
) clean
1429 # Clear a bunch of variables before executing the submake
1430 ifeq ($(quiet
),silent_
)
1435 $(Q
)mkdir
-p
$(objtree
)/tools
1436 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1439 $(Q
)mkdir
-p
$(objtree
)/tools
1440 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1442 # ---------------------------------------------------------------------------
1447 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1449 kselftest-
%: headers FORCE
1450 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1452 PHONY
+= kselftest-merge
1454 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1455 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config | \
1456 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-m
$(objtree
)/.config
1457 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1459 # ---------------------------------------------------------------------------
1462 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1463 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1469 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1471 %.dtbo
: dtbs_prepare
1472 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1474 PHONY
+= dtbs dtbs_prepare dtbs_install dtbs_check
1476 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1478 # include/config/kernel.release is actually needed when installing DTBs because
1479 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1480 # dtbs_install depend on it as dtbs_install may run as root.
1481 dtbs_prepare
: include/config
/kernel.release scripts_dtc
1483 ifneq ($(filter dtbs_check
, $(MAKECMDGOALS
)),)
1487 ifneq ($(CHECK_DTBS
),)
1488 dtbs_prepare
: dt_binding_check
1494 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
) dst
=$(INSTALL_DTBS_PATH
)
1496 ifdef CONFIG_OF_EARLY_FLATTREE
1502 PHONY
+= scripts_dtc
1503 scripts_dtc
: scripts_basic
1504 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1506 ifneq ($(filter dt_binding_check
, $(MAKECMDGOALS
)),)
1507 export CHECK_DT_BINDING
=y
1510 PHONY
+= dt_binding_check
1511 dt_binding_check
: scripts_dtc
1512 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1514 PHONY
+= dt_compatible_check
1515 dt_compatible_check
: dt_binding_check
1516 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
$@
1518 # ---------------------------------------------------------------------------
1521 ifdef CONFIG_MODULES
1523 # By default, build modules as well
1527 # When we're building modules with modversions, we need to consider
1528 # the built-in objects during the descend as well, in order to
1529 # make sure the checksums are up to date before we record them.
1530 ifdef CONFIG_MODVERSIONS
1537 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1539 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1544 modules
: modules_prepare
1546 # Target to prepare building external modules
1547 modules_prepare
: prepare
1548 $(Q
)$(MAKE
) $(build
)=scripts scripts
/module.lds
1550 export modules_sign_only
:=
1552 ifeq ($(CONFIG_MODULE_SIG
),y
)
1553 PHONY
+= modules_sign
1554 modules_sign
: modules_install
1557 # modules_sign is a subset of modules_install.
1558 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1559 ifeq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1560 modules_sign_only
:= y
1564 endif # CONFIG_MODULES
1567 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1568 modinst_pre
:= __modinst_pre
1571 modules_install
: $(modinst_pre
)
1572 PHONY
+= __modinst_pre
1574 @
rm -rf
$(MODLIB
)/kernel
1575 @
rm -f
$(MODLIB
)/source
1577 ifdef CONFIG_MODULES
1578 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1579 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1580 rm -f
$(MODLIB
)/build
; \
1581 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1583 @sed
's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order
> $(MODLIB
)/modules.order
1585 @cp
-f modules.builtin
$(MODLIB
)/
1586 @cp
-f
$(objtree
)/modules.builtin.modinfo
$(MODLIB
)/
1589 # Cleaning is done on three levels.
1590 # make clean Delete most generated files
1591 # Leave enough to build external modules
1592 # make mrproper Delete the current configuration, and all generated files
1593 # make distclean Remove editor backup files, patch leftover files and the like
1595 # Directories & files removed with 'make clean'
1596 CLEAN_FILES
+= include/ksym vmlinux.symvers modules-only.symvers \
1597 modules.builtin modules.builtin.modinfo modules.nsdeps \
1598 compile_commands.json .thinlto-cache rust
/test rust
/doc \
1599 rust-project.json .vmlinux.objs .vmlinux.
export.c
1601 # Directories & files removed with 'make mrproper'
1602 MRPROPER_FILES
+= include/config
include/generated \
1603 arch
/$(SRCARCH
)/include/generated .objdiff \
1604 debian snap tar-install \
1605 .config .config.old .version \
1607 certs
/signing_key.pem \
1613 # clean - Delete most, but leave enough to build external modules
1615 clean: rm-files
:= $(CLEAN_FILES
)
1617 PHONY
+= archclean vmlinuxclean
1620 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1621 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1623 clean: archclean vmlinuxclean resolve_btfids_clean
1625 # mrproper - Delete all generated files, including .config
1627 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1628 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1630 PHONY
+= $(mrproper-dirs
) mrproper
1632 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1634 mrproper
: clean $(mrproper-dirs
)
1636 @find .
$(RCS_FIND_IGNORE
) \
1637 \
( -name
'*.rmeta' \
) \
1638 -type f
-print | xargs
rm -f
1645 @find .
$(RCS_FIND_IGNORE
) \
1646 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1647 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1648 -o
-name
'core' -o
-name
tags -o
-name TAGS
-o
-name
'cscope*' \
1649 -o
-name GPATH
-o
-name GRTAGS
-o
-name GSYMS
-o
-name GTAGS \
) \
1650 -type f
-print | xargs
rm -f
1653 # Packaging of the kernel to various formats
1654 # ---------------------------------------------------------------------------
1657 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1658 %pkg
: include/config
/kernel.release FORCE
1659 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1661 # Brief documentation of the typical targets used
1662 # ---------------------------------------------------------------------------
1664 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1665 boards
:= $(sort $(notdir $(boards
)))
1666 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1667 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1671 @echo
'Cleaning targets:'
1672 @echo
' clean - Remove most generated files but keep the config and'
1673 @echo
' enough build support to build external modules'
1674 @echo
' mrproper - Remove all generated files + config + various backup files'
1675 @echo
' distclean - mrproper + remove editor backup and patch files'
1677 @echo
'Configuration targets:'
1678 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1680 @echo
'Other generic targets:'
1681 @echo
' all - Build all targets marked with [*]'
1682 @echo
'* vmlinux - Build the bare kernel'
1683 @echo
'* modules - Build all modules'
1684 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1685 @echo
' dir/ - Build all files in dir and below'
1686 @echo
' dir/file.[ois] - Build specified target only'
1687 @echo
' dir/file.ll - Build the LLVM assembly file'
1688 @echo
' (requires compiler support for LLVM assembly generation)'
1689 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1690 @echo
' (requires a recent binutils and recent build (System.map))'
1691 @echo
' dir/file.ko - Build module including final link'
1692 @echo
' modules_prepare - Set up for building external modules'
1693 @echo
' tags/TAGS - Generate tags file for editors'
1694 @echo
' cscope - Generate cscope index'
1695 @echo
' gtags - Generate GNU GLOBAL index'
1696 @echo
' kernelrelease - Output the release version string (use with make -s)'
1697 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1698 @echo
' image_name - Output the image name (use with make -s)'
1699 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1700 echo
' (default: $(INSTALL_HDR_PATH))'; \
1702 @echo
'Static analysers:'
1703 @echo
' checkstack - Generate a list of stack hogs'
1704 @echo
' versioncheck - Sanity check on version.h usage'
1705 @echo
' includecheck - Check for duplicate included header files'
1706 @echo
' export_report - List the usages of all exported symbols'
1707 @echo
' headerdep - Detect inclusion cycles in headers'
1708 @echo
' coccicheck - Check with Coccinelle'
1709 @echo
' clang-analyzer - Check with clang static analyzer'
1710 @echo
' clang-tidy - Check with clang-tidy'
1713 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1715 @echo
'Kernel selftest:'
1716 @echo
' kselftest - Build and run kernel selftest'
1717 @echo
' Build, install, and boot kernel before'
1718 @echo
' running kselftest on it'
1719 @echo
' Run as root for full coverage'
1720 @echo
' kselftest-all - Build kernel selftest'
1721 @echo
' kselftest-install - Build and install kernel selftest'
1722 @echo
' kselftest-clean - Remove all generated kselftest files'
1723 @echo
' kselftest-merge - Merge all the config dependencies of'
1724 @echo
' kselftest to existing .config.'
1726 @echo
'Rust targets:'
1727 @echo
' rustavailable - Checks whether the Rust toolchain is'
1728 @echo
' available and, if not, explains why.'
1729 @echo
' rustfmt - Reformat all the Rust code in the kernel'
1730 @echo
' rustfmtcheck - Checks if all the Rust code in the kernel'
1731 @echo
' is formatted, printing a diff otherwise.'
1732 @echo
' rustdoc - Generate Rust documentation'
1733 @echo
' (requires kernel .config)'
1734 @echo
' rusttest - Runs the Rust tests'
1735 @echo
' (requires kernel .config; downloads external repos)'
1736 @echo
' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1737 @echo
' (requires kernel .config)'
1738 @echo
' dir/file.[os] - Build specified target only'
1739 @echo
' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1740 @echo
' Run with RUSTFMT=n to skip reformatting if needed.'
1741 @echo
' The output is not intended to be compilable.'
1742 @echo
' dir/file.ll - Build the LLVM assembly file'
1745 echo
'Devicetree:'; \
1746 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1747 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1748 echo
' dt_binding_check - Validate device tree binding documents'; \
1749 echo
' dtbs_check - Validate device tree source files';\
1752 @echo
'Userspace tools targets:'
1753 @echo
' use "make tools/help"'
1754 @echo
' or "cd tools; make help"'
1756 @echo
'Kernel packaging:'
1757 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1759 @echo
'Documentation targets:'
1760 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1762 @echo
'Architecture specific targets ($(SRCARCH)):'
1764 echo
' No architecture specific help defined for $(SRCARCH)')
1767 $(foreach b
, $(boards
), \
1768 printf
" %-27s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1770 @
$(if
$(board-dirs
), \
1771 $(foreach b
, $(board-dirs
), \
1772 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1773 printf
" %-16s - Show all of the above\\n" help-boards
; \
1776 @echo
' make V=n [targets] 1: verbose build'
1777 @echo
' 2: give reason for rebuild of target'
1778 @echo
' V=1 and V=2 can be combined with V=12'
1779 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1780 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK'
1781 @echo
' (sparse by default)'
1782 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1783 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1784 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1785 @echo
' 1: warnings which may be relevant and do not occur too often'
1786 @echo
' 2: warnings which occur quite often but may still be relevant'
1787 @echo
' 3: more obscure warnings, can most likely be ignored'
1788 @echo
' e: warnings are being treated as errors'
1789 @echo
' Multiple levels can be combined with W=12 or W=123'
1791 echo
' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1792 echo
' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1795 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1796 @echo
'For further info see the ./README file'
1799 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1801 help-boards
: $(help-board-dirs
)
1803 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1805 $(help-board-dirs
): help-
%:
1806 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1807 @
$(if
$(boards-per-dir
), \
1808 $(foreach b
, $(boards-per-dir
), \
1809 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1813 # Documentation targets
1814 # ---------------------------------------------------------------------------
1815 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1816 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1817 PHONY
+= $(DOC_TARGETS
)
1819 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1823 # ---------------------------------------------------------------------------
1825 # "Is Rust available?" target
1826 PHONY
+= rustavailable
1828 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
-v
&& echo
"Rust is available!"
1830 # Documentation target
1832 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1835 $(Q
)$(MAKE
) $(build
)=rust
$@
1840 $(Q
)$(MAKE
) $(build
)=rust
$@
1842 # Formatting targets
1843 PHONY
+= rustfmt rustfmtcheck
1845 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1847 # We match using absolute paths since `find` does not resolve them
1848 # when matching, which is a problem when e.g. `srctree` is `..`.
1849 # We `grep` afterwards in order to remove the directory entry itself.
1851 $(Q
)find
$(abs_srctree
) -type f
-name
'*.rs' \
1852 -o
-path
$(abs_srctree
)/rust
/alloc
-prune \
1853 -o
-path
$(abs_objtree
)/rust
/test -prune \
1854 | grep
-Fv
$(abs_srctree
)/rust
/alloc \
1855 | grep
-Fv
$(abs_objtree
)/rust
/test \
1856 | grep
-Fv generated \
1857 | xargs
$(RUSTFMT
) $(rustfmt_flags
)
1859 rustfmtcheck
: rustfmt_flags
= --check
1860 rustfmtcheck
: rustfmt
1862 # IDE support targets
1863 PHONY
+= rust-analyzer
1865 $(Q
)$(MAKE
) $(build
)=rust
$@
1868 # ---------------------------------------------------------------------------
1872 $(Q
)$(srctree
)/scripts
/misc-check
1876 PHONY
+= scripts_gdb
1877 scripts_gdb
: prepare0
1878 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1879 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1881 ifdef CONFIG_GDB_SCRIPTS
1885 else # KBUILD_EXTMOD
1887 filechk_kernel.release
= echo
$(KERNELRELEASE
)
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 __external_modules_error
:
1931 @echo
>&2 '*** The present kernel disabled CONFIG_MODULES.'
1932 @echo
>&2 '*** You cannot build or install external modules.'
1936 endif # KBUILD_EXTMOD
1938 # ---------------------------------------------------------------------------
1941 PHONY
+= modules modules_install modules_prepare
1943 ifdef CONFIG_MODULES
1945 $(MODORDER
): $(build-dir
)
1948 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1949 # This is solely useful to speed up test compiles.
1951 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
1952 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
1955 PHONY
+= modules_check
1956 modules_check
: $(MODORDER
)
1957 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
$<
1959 quiet_cmd_depmod
= DEPMOD
$(MODLIB
)
1960 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1964 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1967 else # CONFIG_MODULES
1969 # Modules not configured
1970 # ---------------------------------------------------------------------------
1972 PHONY
+= __external_modules_error
1974 modules modules_install
: __external_modules_error
1979 endif # CONFIG_MODULES
1982 modpost
: $(if
$(single-build
),, $(if
$(KBUILD_BUILTIN
), vmlinux.o
)) \
1983 $(if
$(KBUILD_MODULES
), modules_check
)
1984 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1987 # ---------------------------------------------------------------------------
1988 # To build individual files in subdirectories, you can do like this:
1990 # make foo/bar/baz.s
1992 # The supported suffixes for single-target are listed in 'single-targets'
1994 # To build only under specific subdirectories, you can do like this:
2000 # .ko is special because modpost is needed
2001 single-ko
:= $(sort $(filter %.ko
, $(MAKECMDGOALS
)))
2002 single-no-ko
:= $(filter-out $(single-ko
), $(MAKECMDGOALS
)) \
2003 $(foreach x
, o mod
, $(patsubst %.ko
, %.
$x, $(single-ko
)))
2005 $(single-ko
): single_modules
2007 $(single-no-ko
): $(build-dir
)
2010 # Remove MODORDER when done because it is not the real one.
2011 PHONY
+= single_modules
2012 single_modules
: $(single-no-ko
) modules_prepare
2013 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod_prefix
)$(m
:%.ko
=%.o
);) } > $(MODORDER
)
2014 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
2015 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
2016 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
2018 $(Q
)rm -f
$(MODORDER
)
2020 single-goals
:= $(addprefix $(build-dir
)/, $(single-no-ko
))
2026 # Preset locale variables to speed up the build process. Limit locale
2027 # tweaks to this spot to avoid wrong language settings when running
2028 # make menuconfig etc.
2029 # Error messages still appears in the original language
2030 PHONY
+= $(build-dir
)
2031 $(build-dir
): prepare
2032 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1 need-modorder
=1 $(single-goals
)
2034 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
2035 PHONY
+= $(clean-dirs
) clean
2037 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
2039 clean: $(clean-dirs
)
2041 @find
$(or
$(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
2042 \
( -name
'*.[aios]' -o
-name
'*.rsi' -o
-name
'*.ko' -o
-name
'.*.cmd' \
2044 -o
-name
'*.dtb' -o
-name
'*.dtbo' \
2045 -o
-name
'*.dtb.S' -o
-name
'*.dtbo.S' \
2046 -o
-name
'*.dt.yaml' \
2047 -o
-name
'*.dwo' -o
-name
'*.lst' \
2048 -o
-name
'*.su' -o
-name
'*.mod' \
2049 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
2050 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
2051 -o
-name
'*.asn1.[ch]' \
2052 -o
-name
'*.symtypes' -o
-name
'modules.order' \
2053 -o
-name
'*.c.[012]*.*' \
2056 -o
-name
'*.*.symversions' \
) -type f
-print \
2057 -o
-name
'.tmp_*' -print \
2060 # Generate tags for editors
2061 # ---------------------------------------------------------------------------
2062 quiet_cmd_tags
= GEN
$@
2063 cmd_tags
= $(BASH
) $(srctree
)/scripts
/tags.sh
$@
2065 tags TAGS cscope gtags
: FORCE
2068 # Script to generate missing namespace dependencies
2069 # ---------------------------------------------------------------------------
2072 nsdeps
: export KBUILD_NSDEPS
=1
2074 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/nsdeps
2077 # ---------------------------------------------------------------------------
2079 quiet_cmd_gen_compile_commands
= GEN
$@
2080 cmd_gen_compile_commands
= $(PYTHON3
) $< -a
$(AR
) -o
$@
$(filter-out $<, $(real-prereqs
))
2082 $(extmod_prefix
)compile_commands.json
: scripts
/clang-tools
/gen_compile_commands.py \
2083 $(if
$(KBUILD_EXTMOD
),, vmlinux.a
$(KBUILD_VMLINUX_LIBS
)) \
2084 $(if
$(CONFIG_MODULES
), $(MODORDER
)) FORCE
2085 $(call if_changed
,gen_compile_commands
)
2087 targets
+= $(extmod_prefix
)compile_commands.json
2089 PHONY
+= clang-tidy clang-analyzer
2091 ifdef CONFIG_CC_IS_CLANG
2092 quiet_cmd_clang_tools
= CHECK
$<
2093 cmd_clang_tools
= $(PYTHON3
) $(srctree
)/scripts
/clang-tools
/run-clang-tools.py
$@
$<
2095 clang-tidy clang-analyzer
: $(extmod_prefix
)compile_commands.json
2096 $(call cmd
,clang_tools
)
2098 clang-tidy clang-analyzer
:
2099 @echo
"$@ requires CC=clang" >&2
2103 # Scripts to check various things for consistency
2104 # ---------------------------------------------------------------------------
2106 PHONY
+= includecheck versioncheck coccicheck export_report
2109 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
2110 -name
'*.[hcS]' -type f
-print |
sort \
2111 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
2114 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
2115 -name
'*.[hcS]' -type f
-print |
sort \
2116 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
2119 $(Q
)$(BASH
) $(srctree
)/scripts
/$@
2122 $(PERL
) $(srctree
)/scripts
/export_report.pl
2124 PHONY
+= checkstack kernelrelease kernelversion image_name
2126 # UML needs a little special treatment here. It wants to use the host
2127 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2128 # else wants $(ARCH), including people doing cross-builds, which means
2129 # that $(SUBARCH) doesn't work here.
2131 CHECKSTACK_ARCH
:= $(SUBARCH
)
2133 CHECKSTACK_ARCH
:= $(ARCH
)
2136 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
2137 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
2140 @
$(filechk_kernel.release
)
2143 @echo
$(KERNELVERSION
)
2146 @echo
$(KBUILD_IMAGE
)
2148 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
2149 cmd_rmfiles
= rm -rf
$(rm-files
)
2151 # read saved command lines for existing targets
2152 existing-targets
:= $(wildcard $(sort $(targets
)))
2154 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
2156 endif # config-build
2158 endif # need-sub-make
2163 # Declare the contents of the PHONY variable as phony. We keep that
2164 # information in a variable so we can use it in if_changed and friends.