1 # SPDX-License-Identifier: GPL-2.0
6 NAME
= Hurr durr I
'ma ninja sloth
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 ifeq ($(filter undefine,$(.FEATURES)),)
15 $(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION))
18 $(if $(filter __%, $(MAKECMDGOALS)), \
19 $(error targets prefixed with '__
' are only for internal use))
21 # That's our default target when none is given on the command line
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.a targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 ifneq ($(sub_make_done
),1)
43 # Do not use make's built-in rules and variables
44 # (this increases performance and avoids hard-to-debug behaviour)
47 # Avoid funny character set dependencies
51 export LC_COLLATE LC_NUMERIC
53 # Avoid interference with shell env settings
57 # ---------------------------------------------------------------------------
59 # Normally, we echo the whole command before executing it. By making
60 # that echo $($(quiet)$(cmd)), we now have the possibility to set
61 # $(quiet) to choose other forms of output instead, e.g.
63 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
64 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
66 # If $(quiet) is empty, the whole command will be printed.
67 # If it is set to "quiet_", only the short version will be printed.
68 # If it is set to "silent_", nothing will be printed at all, since
69 # the variable $(silent_cmd_cc_o_c) doesn't exist.
71 # A simple variant is to prefix commands with $(Q) - that's useful
72 # for commands that shall be hidden in non-verbose mode.
76 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
77 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
78 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
80 # To put more focus on warnings, be less verbose as default
81 # Use 'make V=1' to see the full commands
83 ifeq ("$(origin V)", "command line")
90 ifeq ($(KBUILD_VERBOSE
),1)
98 # If the user is running make -s (silent mode), suppress echoing of
100 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
102 ifeq ($(filter 3.
%,$(MAKE_VERSION
)),)
103 silence
:=$(findstring s
,$(firstword -$(MAKEFLAGS
)))
105 silence
:=$(findstring s
,$(filter-out --%,$(MAKEFLAGS
)))
113 export quiet Q KBUILD_VERBOSE
115 # Call a source code checker (by default, "sparse") as part of the
118 # Use 'make C=1' to enable checking of only re-compiled files.
119 # Use 'make C=2' to enable checking of *all* source files, regardless
120 # of whether they are re-compiled or not.
122 # See the file "Documentation/dev-tools/sparse.rst" for more details,
123 # including where to get the "sparse" utility.
125 ifeq ("$(origin C)", "command line")
126 KBUILD_CHECKSRC
= $(C
)
128 ifndef KBUILD_CHECKSRC
132 export KBUILD_CHECKSRC
134 # Enable "clippy" (a linter) as part of the Rust compilation.
136 # Use 'make CLIPPY=1' to enable it.
137 ifeq ("$(origin CLIPPY)", "command line")
138 KBUILD_CLIPPY
:= $(CLIPPY
)
143 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
144 # directory of external module to build. Setting M= takes precedence.
145 ifeq ("$(origin M)", "command line")
146 KBUILD_EXTMOD
:= $(M
)
149 $(if
$(word 2, $(KBUILD_EXTMOD
)), \
150 $(error building multiple external modules is not supported
))
152 $(foreach x
, % :, $(if
$(findstring $x, $(KBUILD_EXTMOD
)), \
153 $(error module directory path cannot contain
'$x')))
155 # Remove trailing slashes
156 ifneq ($(filter %/, $(KBUILD_EXTMOD
)),)
157 KBUILD_EXTMOD
:= $(shell dirname
$(KBUILD_EXTMOD
).
)
162 # Kbuild will save output files in the current working directory.
163 # This does not need to match to the root of the kernel source tree.
165 # For example, you can do this:
167 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
169 # If you want to save output files in a different location, there are
170 # two syntaxes to specify it.
173 # Use "make O=dir/to/store/output/files/"
175 # 2) Set KBUILD_OUTPUT
176 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
177 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
179 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
182 # Do we want to change the working directory?
183 ifeq ("$(origin O)", "command line")
184 KBUILD_OUTPUT
:= $(O
)
187 ifneq ($(KBUILD_OUTPUT
),)
188 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
189 # expand a shell special character '~'. We use a somewhat tedious way here.
190 abs_objtree
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) && pwd
)
191 $(if
$(abs_objtree
),, \
192 $(error failed to create output directory
"$(KBUILD_OUTPUT)"))
194 # $(realpath ...) resolves symlinks
195 abs_objtree
:= $(realpath
$(abs_objtree
))
197 abs_objtree
:= $(CURDIR
)
198 endif # ifneq ($(KBUILD_OUTPUT),)
200 ifeq ($(abs_objtree
),$(CURDIR
))
201 # Suppress "Entering directory ..." unless we are changing the work directory.
202 MAKEFLAGS
+= --no-print-directory
207 this-makefile
:= $(lastword
$(MAKEFILE_LIST
))
208 abs_srctree
:= $(realpath
$(dir $(this-makefile
)))
210 ifneq ($(words $(subst :, ,$(abs_srctree
))), 1)
211 $(error source directory cannot contain spaces or colons
)
214 ifneq ($(abs_srctree
),$(abs_objtree
))
215 # Look for make include files relative to root of kernel src
217 # --included-dir is added for backward compatibility, but you should not rely on
218 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
219 MAKEFLAGS
+= --include-dir
=$(abs_srctree
)
222 ifneq ($(filter 3.
%,$(MAKE_VERSION
)),)
223 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
224 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
226 # Cancel implicit rules for this Makefile.
230 export abs_srctree abs_objtree
231 export sub_make_done
:= 1
233 ifeq ($(need-sub-make
),1)
235 PHONY
+= $(MAKECMDGOALS
) __sub-make
237 $(filter-out $(this-makefile
), $(MAKECMDGOALS
)) __all
: __sub-make
240 # Invoke a second make in the output directory, passing relevant variables
242 $(Q
)$(MAKE
) -C
$(abs_objtree
) -f
$(abs_srctree
)/Makefile
$(MAKECMDGOALS
)
244 endif # need-sub-make
245 endif # sub_make_done
247 # We process the rest of the Makefile if this is the final invocation of make
248 ifeq ($(need-sub-make
),)
250 # Do not print "Entering directory ...",
251 # but we want to display it when entering to the output directory
252 # so that IDEs/editors are able to understand relative filenames.
253 MAKEFLAGS
+= --no-print-directory
255 ifeq ($(abs_srctree
),$(abs_objtree
))
256 # building in the source tree
258 building_out_of_srctree
:=
260 ifeq ($(abs_srctree
)/,$(dir $(abs_objtree
)))
261 # building in a subdirectory of the source tree
264 srctree
:= $(abs_srctree
)
266 building_out_of_srctree
:= 1
269 ifneq ($(KBUILD_ABS_SRCTREE
),)
270 srctree
:= $(abs_srctree
)
276 export building_out_of_srctree srctree objtree VPATH
278 # To make sure we do not include .config for any of the *config targets
279 # catch them early, and hand them over to scripts/kconfig/Makefile
280 # It is allowed to specify more targets when calling make, including
281 # mixing *config targets and build targets.
282 # For example 'make oldconfig all'.
283 # Detect when mixed targets is specified, and make a second invocation
284 # of make so .config is not included in this case either (for *config).
286 version_h
:= include/generated
/uapi
/linux
/version.h
288 clean-targets
:= %clean mrproper cleandocs
289 no-dot-config-targets
:= $(clean-targets
) \
290 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
291 $(version_h
) headers headers_
% archheaders archscripts \
292 %asm-generic kernelversion
%src-pkg dt_binding_check \
293 outputmakefile rustavailable rustfmt rustfmtcheck
294 # Installation targets should not require compiler. Unfortunately, vdso_install
295 # is an exception where build artifacts may be updated. This must be fixed.
296 no-compiler-targets
:= $(no-dot-config-targets
) install dtbs_install \
297 headers_install modules_install kernelrelease image_name
298 no-sync-config-targets
:= $(no-dot-config-targets
) %install kernelrelease \
300 single-targets
:= %.a
%.i
%.ko
%.lds
%.ll
%.lst
%.mod
%.o
%.rsi
%.s
%.symtypes
%/
309 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
310 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
315 ifneq ($(filter $(no-compiler-targets
), $(MAKECMDGOALS
)),)
316 ifeq ($(filter-out $(no-compiler-targets
), $(MAKECMDGOALS
)),)
321 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
322 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
327 ifneq ($(KBUILD_EXTMOD
),)
331 ifeq ($(KBUILD_EXTMOD
),)
332 ifneq ($(filter %config
,$(MAKECMDGOALS
)),)
334 ifneq ($(words $(MAKECMDGOALS
)),1)
340 # We cannot build single targets and the others at the same time
341 ifneq ($(filter $(single-targets
), $(MAKECMDGOALS
)),)
343 ifneq ($(filter-out $(single-targets
), $(MAKECMDGOALS
)),)
348 # For "make -j clean all", "make -j mrproper defconfig all", etc.
349 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
350 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
355 # install and modules_install need also be processed one by one
356 ifneq ($(filter install,$(MAKECMDGOALS
)),)
357 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
363 # ===========================================================================
364 # We're called with mixed targets (*config and build targets).
365 # Handle them one by one.
367 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
369 $(MAKECMDGOALS
): __build_one_by_one
374 for i in
$(MAKECMDGOALS
); do \
375 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
380 include $(srctree
)/scripts
/Kbuild.
include
382 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
383 KERNELRELEASE
= $(call read-file
, include/config
/kernel.release
)
384 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
385 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
387 include $(srctree
)/scripts
/subarch.
include
389 # Cross compiling and selecting different set of gcc/bin-utils
390 # ---------------------------------------------------------------------------
392 # When performing cross compilation for other architectures ARCH shall be set
393 # to the target architecture. (See arch/* for the possibilities).
394 # ARCH can be set during invocation of make:
396 # Another way is to have ARCH set in the environment.
397 # The default ARCH is the host where make is executed.
399 # CROSS_COMPILE specify the prefix used for all executables used
400 # during compilation. Only gcc and related bin-utils executables
401 # are prefixed with $(CROSS_COMPILE).
402 # CROSS_COMPILE can be set on the command line
403 # make CROSS_COMPILE=ia64-linux-
404 # Alternatively CROSS_COMPILE can be set in the environment.
405 # Default value for CROSS_COMPILE is not to prefix executables
406 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
409 # Architecture as present in compile.h
410 UTS_MACHINE
:= $(ARCH
)
413 # Additional ARCH settings for x86
417 ifeq ($(ARCH
),x86_64
)
421 # Additional ARCH settings for sparc
422 ifeq ($(ARCH
),sparc32
)
425 ifeq ($(ARCH
),sparc64
)
429 # Additional ARCH settings for parisc
430 ifeq ($(ARCH
),parisc64
)
434 export cross_compiling
:=
435 ifneq ($(SRCARCH
),$(SUBARCH
))
439 KCONFIG_CONFIG ?
= .config
440 export KCONFIG_CONFIG
442 # SHELL used by kbuild
445 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
446 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
447 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
450 ifneq ($(filter %/,$(LLVM
)),)
451 LLVM_PREFIX
:= $(LLVM
)
452 else ifneq ($(filter -%,$(LLVM
)),)
453 LLVM_SUFFIX
:= $(LLVM
)
456 HOSTCC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
457 HOSTCXX
= $(LLVM_PREFIX
)clang
++$(LLVM_SUFFIX
)
463 HOSTPKG_CONFIG
= pkg-config
465 KBUILD_USERHOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes \
466 -O2
-fomit-frame-pointer
-std
=gnu11 \
467 -Wdeclaration-after-statement
468 KBUILD_USERCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(USERCFLAGS
)
469 KBUILD_USERLDFLAGS
:= $(USERLDFLAGS
)
471 # These flags apply to all Rust code in the tree, including the kernel and
473 export rust_common_flags
:= --edition
=2021 \
474 -Zbinary_dep_depinfo
=y \
475 -Dunsafe_op_in_unsafe_fn
-Drust_2018_idioms \
476 -Dunreachable_pub
-Dnon_ascii_idents \
478 -Drustdoc
::missing_crate_level_docs \
479 -Dclippy
::correctness
-Dclippy
::style \
480 -Dclippy
::suspicious
-Dclippy
::complexity \
482 -Dclippy
::let_unit_value
-Dclippy
::mut_mut \
483 -Dclippy
::needless_bitwise_bool \
484 -Dclippy
::needless_continue \
487 KBUILD_HOSTCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(HOST_LFS_CFLAGS
) $(HOSTCFLAGS
)
488 KBUILD_HOSTCXXFLAGS
:= -Wall
-O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
489 KBUILD_HOSTRUSTFLAGS
:= $(rust_common_flags
) -O
-Cstrip
=debuginfo \
490 -Zallow-features
= $(HOSTRUSTFLAGS
)
491 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
492 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
494 # Make variables (CC, etc...)
497 CC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
498 LD
= $(LLVM_PREFIX
)ld.lld
$(LLVM_SUFFIX
)
499 AR
= $(LLVM_PREFIX
)llvm-ar
$(LLVM_SUFFIX
)
500 NM
= $(LLVM_PREFIX
)llvm-nm
$(LLVM_SUFFIX
)
501 OBJCOPY
= $(LLVM_PREFIX
)llvm-objcopy
$(LLVM_SUFFIX
)
502 OBJDUMP
= $(LLVM_PREFIX
)llvm-objdump
$(LLVM_SUFFIX
)
503 READELF
= $(LLVM_PREFIX
)llvm-readelf
$(LLVM_SUFFIX
)
504 STRIP
= $(LLVM_PREFIX
)llvm-strip
$(LLVM_SUFFIX
)
506 CC
= $(CROSS_COMPILE
)gcc
507 LD
= $(CROSS_COMPILE
)ld
508 AR
= $(CROSS_COMPILE
)ar
509 NM
= $(CROSS_COMPILE
)nm
510 OBJCOPY
= $(CROSS_COMPILE
)objcopy
511 OBJDUMP
= $(CROSS_COMPILE
)objdump
512 READELF
= $(CROSS_COMPILE
)readelf
513 STRIP
= $(CROSS_COMPILE
)strip
518 CLIPPY_DRIVER
= clippy-driver
522 RESOLVE_BTFIDS
= $(objtree
)/tools
/bpf
/resolve_btfids
/resolve_btfids
526 INSTALLKERNEL
:= installkernel
540 PAHOLE_FLAGS
= $(shell PAHOLE
=$(PAHOLE
) $(srctree
)/scripts
/pahole-flags.sh
)
542 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
543 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
554 # Use USERINCLUDE when you must reference the UAPI directories only.
556 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
557 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
558 -I
$(srctree
)/include/uapi \
559 -I
$(objtree
)/include/generated
/uapi \
560 -include $(srctree
)/include/linux
/compiler-version.h \
561 -include $(srctree
)/include/linux
/kconfig.h
563 # Use LINUXINCLUDE when you must reference the include/ directory.
564 # Needed to be compatible with the O= option
566 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
567 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
568 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
569 -I
$(objtree
)/include \
572 # UBUNTU: Include our third party driver stuff too
573 LINUXINCLUDE
+= -I
$(srctree
)/ubuntu
/include
575 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
576 KBUILD_CFLAGS
:= -Wall
-Wundef
-Werror
=strict-prototypes
-Wno-trigraphs \
577 -fno-strict-aliasing
-fno-common
-fshort-wchar
-fno-PIE \
578 -Werror
=implicit-function-declaration
-Werror
=implicit-int \
579 -Werror
=return-type
-Wno-format-security
-funsigned-char \
581 KBUILD_CPPFLAGS
:= -D__KERNEL__
582 KBUILD_RUSTFLAGS
:= $(rust_common_flags
) \
583 --target
=$(objtree
)/rust
/target.json \
584 -Cpanic
=abort
-Cembed-bitcode
=n
-Clto
=n \
585 -Cforce-unwind-tables
=n
-Ccodegen-units
=1 \
586 -Csymbol-mangling-version
=v0 \
587 -Crelocation-model
=static \
588 -Zfunction-sections
=n \
589 -Dclippy
::float_arithmetic
591 KBUILD_AFLAGS_KERNEL
:=
592 KBUILD_CFLAGS_KERNEL
:=
593 KBUILD_RUSTFLAGS_KERNEL
:=
594 KBUILD_AFLAGS_MODULE
:= -DMODULE
595 KBUILD_CFLAGS_MODULE
:= -DMODULE
596 KBUILD_RUSTFLAGS_MODULE
:= --cfg MODULE
597 KBUILD_LDFLAGS_MODULE
:=
601 ifeq ($(KBUILD_CLIPPY
),1)
602 RUSTC_OR_CLIPPY_QUIET
:= CLIPPY
603 RUSTC_OR_CLIPPY
= $(CLIPPY_DRIVER
)
605 RUSTC_OR_CLIPPY_QUIET
:= RUSTC
606 RUSTC_OR_CLIPPY
= $(RUSTC
)
613 # Allows the usage of unstable features in stable compilers.
614 export RUSTC_BOOTSTRAP
:= 1
616 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
617 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
618 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
619 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
620 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
621 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
622 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
623 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
625 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
626 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
627 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
628 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
629 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
630 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
633 # Files to ignore in find ... statements
635 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
636 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
638 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
639 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
641 # ===========================================================================
642 # Rules shared between *config targets and build targets
644 # Basic helpers built in scripts/basic/
645 PHONY
+= scripts_basic
647 $(Q
)$(MAKE
) $(build
)=scripts
/basic
649 PHONY
+= outputmakefile
650 ifdef building_out_of_srctree
651 # Before starting out-of-tree build, make sure the source tree is clean.
652 # outputmakefile generates a Makefile in the output directory, if using a
653 # separate output directory. This allows convenient use of make in the
655 # At the same time when output Makefile generated, generate .gitignore to
656 # ignore whole output directory
658 quiet_cmd_makefile
= GEN Makefile
660 echo
"\# Automatically generated by $(srctree)/Makefile: don't edit"; \
661 echo
"include $(srctree)/Makefile"; \
665 @if
[ -f
$(srctree
)/.config
-o \
666 -d
$(srctree
)/include/config
-o \
667 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
669 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
670 echo
>&2 "*** in $(abs_srctree)";\
674 $(Q
)ln
-fsn
$(srctree
) source
676 $(Q
)test -e .gitignore || \
677 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
680 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
681 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
682 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
683 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
684 CC_VERSION_TEXT
= $(subst $(pound
),,$(shell LC_ALL
=C
$(CC
) --version
2>/dev
/null | head
-n
1))
686 ifneq ($(findstring clang
,$(CC_VERSION_TEXT
)),)
687 include $(srctree
)/scripts
/Makefile.clang
690 # Include this also for config targets because some architectures need
691 # cc-cross-prefix to determine CROSS_COMPILE.
693 include $(srctree
)/scripts
/Makefile.compiler
697 # ===========================================================================
698 # *config targets only - make sure prerequisites are updated, and descend
699 # in scripts/kconfig to make the *config target
701 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
702 # KBUILD_DEFCONFIG may point out an alternative default configuration
703 # used for 'make defconfig'
704 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
705 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
707 config
: outputmakefile scripts_basic FORCE
708 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
710 %config
: outputmakefile scripts_basic FORCE
711 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
714 # ===========================================================================
715 # Build targets only - this includes vmlinux, arch specific targets, clean
716 # targets and others. In general all targets except *config targets.
718 # If building an external module we do not care about the all: rule
719 # but instead __all depend on modules
721 ifeq ($(KBUILD_EXTMOD
),)
729 # Decide whether to build built-in, modular, or both.
730 # Normally, just do built-in.
735 # If we have only "make modules", don't compile built-in objects.
736 ifeq ($(MAKECMDGOALS
),modules
)
740 # If we have "make <whatever> modules", compile modules
741 # in addition to whatever we do anyway.
742 # Just "make" or "make all" shall build modules as well
744 ifneq ($(filter all modules nsdeps
%compile_commands.json clang-
%,$(MAKECMDGOALS
)),)
748 ifeq ($(MAKECMDGOALS
),)
752 export KBUILD_MODULES KBUILD_BUILTIN
755 include include/config
/auto.conf
758 ifeq ($(KBUILD_EXTMOD
),)
759 # Objects we will link into vmlinux / subdirs we need to visit
763 endif # KBUILD_EXTMOD
765 # The all: target is the default when no target is given on the
767 # This allow a user to issue only 'make' to build a kernel including modules
768 # Defaults to vmlinux, but the arch makefile usually adds further targets
771 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
772 ifdef CONFIG_CC_IS_GCC
773 CFLAGS_GCOV
+= -fno-tree-loop-im
777 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
778 ifdef CONFIG_FUNCTION_TRACER
779 CC_FLAGS_FTRACE
:= -pg
782 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
785 ifdef may-sync-config
786 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
787 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
788 # because some architectures define CROSS_COMPILE there.
789 include include/config
/auto.conf.cmd
793 @echo
>&2 '*** Configuration file "$@" not found!'
795 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
796 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
800 # The actual configuration files used during the build are stored in
801 # include/generated/ and include/config/. Update them if .config is newer than
802 # include/config/auto.conf (which mirrors .config).
804 # This exploits the 'multi-target pattern rule' trick.
805 # The syncconfig should be executed only once to make all the targets.
806 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
808 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
809 # so you cannot notice that Kconfig is waiting for the user input.
810 %/config
/auto.conf
%/config
/auto.conf.cmd
%/generated
/autoconf.h
%/generated
/rustc_cfg
: $(KCONFIG_CONFIG
)
811 $(Q
)$(kecho
) " SYNC $@"
812 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
813 else # !may-sync-config
814 # External modules and some install targets need include/generated/autoconf.h
815 # and include/config/auto.conf but do not care if they are up-to-date.
816 # Use auto.conf to trigger the test
817 PHONY
+= include/config
/auto.conf
819 include/config
/auto.conf
:
820 @
test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
822 echo
>&2 " ERROR: Kernel configuration is invalid."; \
823 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
824 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
828 endif # may-sync-config
831 KBUILD_CFLAGS
+= -fno-delete-null-pointer-checks
832 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
833 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
834 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
835 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
837 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
839 KBUILD_RUSTFLAGS
+= -Copt-level
=2
840 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
842 KBUILD_RUSTFLAGS
+= -Copt-level
=s
845 # Always set `debug-assertions` and `overflow-checks` because their default
846 # depends on `opt-level` and `debug-assertions`, respectively.
847 KBUILD_RUSTFLAGS
+= -Cdebug-assertions
=$(if
$(CONFIG_RUST_DEBUG_ASSERTIONS
),y
,n
)
848 KBUILD_RUSTFLAGS
+= -Coverflow-checks
=$(if
$(CONFIG_RUST_OVERFLOW_CHECKS
),y
,n
)
850 # Tell gcc to never replace conditional load with a non-conditional one
851 ifdef CONFIG_CC_IS_GCC
852 # gcc-10 renamed --param=allow-store-data-races=0 to
853 # -fno-allow-store-data-races.
854 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
855 KBUILD_CFLAGS
+= $(call cc-option
,-fno-allow-store-data-races
)
858 ifdef CONFIG_READABLE_ASM
859 # Disable optimizations that make assembler listings hard to read.
860 # reorder blocks reorders the control in the function
861 # ipa clone creates specialized cloned functions
862 # partial inlining inlines only parts of functions
863 KBUILD_CFLAGS
+= -fno-reorder-blocks
-fno-ipa-cp-clone
-fno-partial-inlining
866 ifneq ($(CONFIG_FRAME_WARN
),0)
867 KBUILD_CFLAGS
+= -Wframe-larger-than
=$(CONFIG_FRAME_WARN
)
870 stackp-flags-y
:= -fno-stack-protector
871 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
872 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
874 KBUILD_CFLAGS
+= $(stackp-flags-y
)
876 KBUILD_CPPFLAGS-
$(CONFIG_WERROR
) += -Werror
877 KBUILD_CPPFLAGS
+= $(KBUILD_CPPFLAGS-y
)
878 KBUILD_CFLAGS-
$(CONFIG_CC_NO_ARRAY_BOUNDS
) += -Wno-array-bounds
880 KBUILD_RUSTFLAGS-
$(CONFIG_WERROR
) += -Dwarnings
881 KBUILD_RUSTFLAGS
+= $(KBUILD_RUSTFLAGS-y
)
883 ifdef CONFIG_CC_IS_CLANG
884 KBUILD_CPPFLAGS
+= -Qunused-arguments
885 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
886 KBUILD_CFLAGS
+= -Wno-gnu
889 # gcc inanely warns about local variables called 'main'
890 KBUILD_CFLAGS
+= -Wno-main
893 # These warnings generated too much noise in a regular build.
894 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
895 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
896 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
898 # These result in bogus false positives
899 KBUILD_CFLAGS
+= $(call cc-disable-warning
, dangling-pointer
)
901 ifdef CONFIG_FRAME_POINTER
902 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
903 KBUILD_RUSTFLAGS
+= -Cforce-frame-pointers
=y
905 # Some targets (ARM with Thumb2, for example), can't be built with frame
906 # pointers. For those, we don't have FUNCTION_TRACER automatically
907 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
908 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
909 # -fomit-frame-pointer with FUNCTION_TRACER.
910 # In the Rust target specification, "frame-pointer" is set explicitly
912 ifndef CONFIG_FUNCTION_TRACER
913 KBUILD_CFLAGS
+= -fomit-frame-pointer
917 # Initialize all stack variables with a 0xAA pattern.
918 ifdef CONFIG_INIT_STACK_ALL_PATTERN
919 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
922 # Initialize all stack variables with a zero value.
923 ifdef CONFIG_INIT_STACK_ALL_ZERO
924 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=zero
925 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
926 # https://github.com/llvm/llvm-project/issues/44842
927 KBUILD_CFLAGS
+= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
931 # While VLAs have been removed, GCC produces unreachable stack probes
932 # for the randomize_kstack_offset feature. Disable it for all compilers.
933 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-clash-protection
)
935 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
936 ifdef CONFIG_ZERO_CALL_USED_REGS
937 KBUILD_CFLAGS
+= -fzero-call-used-regs
=used-gpr
940 ifdef CONFIG_FUNCTION_TRACER
941 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
942 CC_FLAGS_FTRACE
+= -mrecord-mcount
943 ifdef CONFIG_HAVE_NOP_MCOUNT
944 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
945 CC_FLAGS_FTRACE
+= -mnop-mcount
946 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
950 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
951 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
952 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
955 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
956 ifdef CONFIG_HAVE_C_RECORDMCOUNT
957 BUILD_C_RECORDMCOUNT
:= y
958 export BUILD_C_RECORDMCOUNT
961 ifdef CONFIG_HAVE_FENTRY
962 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
963 ifeq ($(call cc-option-yn
, -mfentry
),y
)
964 CC_FLAGS_FTRACE
+= -mfentry
965 CC_FLAGS_USING
+= -DCC_USING_FENTRY
968 export CC_FLAGS_FTRACE
969 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
970 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
973 # We trigger additional mismatches with less inlining
974 ifdef CONFIG_DEBUG_SECTION_MISMATCH
975 KBUILD_CFLAGS
+= -fno-inline-functions-called-once
978 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
979 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
980 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
981 KBUILD_RUSTFLAGS_KERNEL
+= -Zfunction-sections
=y
982 LDFLAGS_vmlinux
+= --gc-sections
985 ifdef CONFIG_SHADOW_CALL_STACK
986 ifndef CONFIG_DYNAMIC_SCS
987 CC_FLAGS_SCS
:= -fsanitize
=shadow-call-stack
988 KBUILD_CFLAGS
+= $(CC_FLAGS_SCS
)
993 ifdef CONFIG_LTO_CLANG
994 ifdef CONFIG_LTO_CLANG_THIN
995 CC_FLAGS_LTO
:= -flto
=thin
-fsplit-lto-unit
996 KBUILD_LDFLAGS
+= --thinlto-cache-dir
=$(extmod_prefix
).thinlto-cache
998 CC_FLAGS_LTO
:= -flto
1000 CC_FLAGS_LTO
+= -fvisibility
=hidden
1002 # Limit inlining across translation units to reduce binary size
1003 KBUILD_LDFLAGS
+= -mllvm
-import-instr-limit
=5
1005 # Check for frame size exceeding threshold during prolog/epilog insertion
1006 # when using lld < 13.0.0.
1007 ifneq ($(CONFIG_FRAME_WARN
),0)
1008 ifeq ($(call test-lt
, $(CONFIG_LLD_VERSION
), 130000),y
)
1009 KBUILD_LDFLAGS
+= -plugin-opt
=-warn-stack-size
=$(CONFIG_FRAME_WARN
)
1015 KBUILD_CFLAGS
+= -fno-lto
$(CC_FLAGS_LTO
)
1016 KBUILD_AFLAGS
+= -fno-lto
1020 ifdef CONFIG_CFI_CLANG
1021 CC_FLAGS_CFI
:= -fsanitize
=kcfi
1022 KBUILD_CFLAGS
+= $(CC_FLAGS_CFI
)
1026 ifneq ($(CONFIG_FUNCTION_ALIGNMENT
),0)
1027 KBUILD_CFLAGS
+= -falign-functions
=$(CONFIG_FUNCTION_ALIGNMENT
)
1030 # arch Makefile may override CC so keep this after arch Makefile is included
1031 NOSTDINC_FLAGS
+= -nostdinc
1033 # warn about C99 declaration after statement
1034 KBUILD_CFLAGS
+= -Wdeclaration-after-statement
1036 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1037 KBUILD_CFLAGS
+= -Wvla
1039 # disable pointer signed / unsigned warnings in gcc 4.0
1040 KBUILD_CFLAGS
+= -Wno-pointer-sign
1042 # In order to make sure new function cast mismatches are not introduced
1043 # in the kernel (to avoid tripping CFI checking), the kernel should be
1044 # globally built with -Wcast-function-type.
1045 KBUILD_CFLAGS
+= $(call cc-option
, -Wcast-function-type
)
1047 # disable stringop warnings in gcc 8+
1048 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
1050 # We'll want to enable this eventually, but it's not going away for 5.7 at least
1051 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-overflow
)
1053 # Another good warning that we'll want to enable eventually
1054 KBUILD_CFLAGS
+= $(call cc-disable-warning
, restrict
)
1056 # Enabled with W=2, disabled by default as noisy
1057 ifdef CONFIG_CC_IS_GCC
1058 KBUILD_CFLAGS
+= -Wno-maybe-uninitialized
1061 # The allocators already balk at large sizes, so silence the compiler
1062 # warnings for bounds checks involving those possible values. While
1063 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
1064 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
1065 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1066 # doesn't work (as it is documented to), silently resolving to "0" prior to
1067 # version 9.1 (and producing an error more recently). Numeric values larger
1068 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1069 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1070 # choice, we must perform a versioned check to disable this warning.
1071 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
1072 KBUILD_CFLAGS-
$(call gcc-min-version
, 90100) += -Wno-alloc-size-larger-than
1073 KBUILD_CFLAGS
+= $(KBUILD_CFLAGS-y
) $(CONFIG_CC_IMPLICIT_FALLTHROUGH
)
1075 # disable invalid "can't wrap" optimizations for signed / pointers
1076 KBUILD_CFLAGS
+= -fno-strict-overflow
1078 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1079 KBUILD_CFLAGS
+= -fno-stack-check
1081 # conserve stack if available
1082 ifdef CONFIG_CC_IS_GCC
1083 KBUILD_CFLAGS
+= -fconserve-stack
1086 # Prohibit date/time macros, which would make the build non-deterministic
1087 KBUILD_CFLAGS
+= -Werror
=date-time
1089 # enforce correct pointer usage
1090 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
1092 # Require designated initializers for all marked structures
1093 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
1095 # change __FILE__ to the relative path from the srctree
1096 KBUILD_CPPFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
1098 # include additional Makefiles when needed
1099 include-y
:= scripts
/Makefile.extrawarn
1100 include-
$(CONFIG_DEBUG_INFO
) += scripts
/Makefile.debug
1101 include-
$(CONFIG_KASAN
) += scripts
/Makefile.kasan
1102 include-
$(CONFIG_KCSAN
) += scripts
/Makefile.kcsan
1103 include-
$(CONFIG_KMSAN
) += scripts
/Makefile.kmsan
1104 include-
$(CONFIG_UBSAN
) += scripts
/Makefile.ubsan
1105 include-
$(CONFIG_KCOV
) += scripts
/Makefile.kcov
1106 include-
$(CONFIG_RANDSTRUCT
) += scripts
/Makefile.randstruct
1107 include-
$(CONFIG_GCC_PLUGINS
) += scripts
/Makefile.gcc-plugins
1109 include $(addprefix $(srctree
)/, $(include-y
))
1111 # scripts/Makefile.gcc-plugins is intentionally included last.
1112 # Do not add $(call cc-option,...) below this line. When you build the kernel
1113 # from the clean source tree, the GCC plugins do not exist at this point.
1115 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1116 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
1117 KBUILD_AFLAGS
+= $(KAFLAGS
)
1118 KBUILD_CFLAGS
+= $(KCFLAGS
)
1119 KBUILD_RUSTFLAGS
+= $(KRUSTFLAGS
)
1121 KBUILD_LDFLAGS_MODULE
+= --build-id
=sha1
1122 LDFLAGS_vmlinux
+= --build-id
=sha1
1124 KBUILD_LDFLAGS
+= -z noexecstack
1125 ifeq ($(CONFIG_LD_IS_BFD
),y
)
1126 KBUILD_LDFLAGS
+= $(call ld-option
,--no-warn-rwx-segments
)
1129 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
1130 LDFLAGS_vmlinux
+= -X
1133 ifeq ($(CONFIG_RELR
),y
)
1134 LDFLAGS_vmlinux
+= --pack-dyn-relocs
=relr
--use-android-relr-tags
1137 # We never want expected sections to be placed heuristically by the
1138 # linker. All sections should be explicitly named in the linker script.
1139 ifdef CONFIG_LD_ORPHAN_WARN
1140 LDFLAGS_vmlinux
+= --orphan-handling
=$(CONFIG_LD_ORPHAN_WARN_LEVEL
)
1143 # Align the bit size of userspace programs with the kernel
1144 KBUILD_USERCFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1145 KBUILD_USERLDFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1147 # make the checker run with the right architecture
1148 CHECKFLAGS
+= --arch
=$(ARCH
)
1150 # insure the checker run with the right endianness
1151 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
1153 # the checker needs the correct machine size
1154 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
1156 # Default kernel image to build when no specific target is given.
1157 # KBUILD_IMAGE may be overruled on the command line or
1158 # set in the environment
1159 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1160 # this default value
1161 export KBUILD_IMAGE ?
= vmlinux
1164 # INSTALL_PATH specifies where to place the updated kernel and system map
1165 # images. Default is /boot, but you can set it to other values
1166 export INSTALL_PATH ?
= /boot
1169 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1170 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1171 # an argument if needed. Otherwise it defaults to the kernel install path
1173 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
1176 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1177 # relocations required by build roots. This is not defined in the
1178 # makefile but the argument can be passed to make if needed.
1181 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
1186 export extmod_prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
1187 export MODORDER
:= $(extmod_prefix
)modules.order
1188 export MODULES_NSDEPS
:= $(extmod_prefix
)modules.nsdeps
1190 ifeq ($(KBUILD_EXTMOD
),)
1193 clean-dirs
:= $(sort . Documentation \
1194 $(patsubst %/,%,$(filter %/, $(core-
) \
1195 $(drivers-
) $(libs-
))))
1197 export ARCH_CORE
:= $(core-y
)
1198 export ARCH_LIB
:= $(filter %/, $(libs-y
))
1199 export ARCH_DRIVERS
:= $(drivers-y
) $(drivers-m
)
1200 # Externally visible symbols (used by link-vmlinux.sh)
1202 KBUILD_VMLINUX_OBJS
:= .
/built-in.a
1203 ifdef CONFIG_MODULES
1204 KBUILD_VMLINUX_OBJS
+= $(patsubst %/, %/lib.a
, $(filter %/, $(libs-y
)))
1205 KBUILD_VMLINUX_LIBS
:= $(filter-out %/, $(libs-y
))
1207 KBUILD_VMLINUX_LIBS
:= $(patsubst %/,%/lib.a
, $(libs-y
))
1210 export KBUILD_VMLINUX_LIBS
1211 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1213 # Recurse until adjust_autoksyms.sh is satisfied
1214 PHONY
+= autoksyms_recursive
1215 ifdef CONFIG_TRIM_UNUSED_KSYMS
1216 # For the kernel to actually contain only the needed exported symbols,
1217 # we have to build modules as well to determine what those symbols are.
1218 # (this can be evaluated only once include/config/auto.conf has been included)
1221 autoksyms_recursive
: $(build-dir
) modules.order
1222 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1223 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1226 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1228 quiet_cmd_autoksyms_h
= GEN
$@
1229 cmd_autoksyms_h
= mkdir
-p
$(dir $@
); \
1230 $(CONFIG_SHELL
) $(srctree
)/scripts
/gen_autoksyms.sh
$@
1233 $(call cmd
,autoksyms_h
)
1235 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1236 quiet_cmd_ar_vmlinux.a
= AR
$@
1237 cmd_ar_vmlinux.a
= \
1239 $(AR
) cDPrST
$@
$(KBUILD_VMLINUX_OBJS
); \
1240 $(AR
) mPiT
$$($(AR
) t
$@ | sed
-n
1p
) $@
$$($(AR
) t
$@ | grep
-F
-f
$(srctree
)/scripts
/head-object-list.txt
)
1242 targets
+= vmlinux.a
1243 vmlinux.a
: $(KBUILD_VMLINUX_OBJS
) scripts
/head-object-list.txt autoksyms_recursive FORCE
1244 $(call if_changed
,ar_vmlinux.a
)
1247 vmlinux_o
: vmlinux.a
$(KBUILD_VMLINUX_LIBS
)
1248 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux_o
1250 vmlinux.o modules.builtin.modinfo modules.builtin
: vmlinux_o
1254 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1255 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1256 # unrelated; the decompressors just happen to have the same base name,
1257 # arch/*/boot/compressed/vmlinux.
1258 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1260 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1261 # https://savannah.gnu.org/bugs/?61463
1262 # For Make > 4.4, the following simple code will work:
1263 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1264 vmlinux
: private _LDFLAGS_vmlinux
:= $(LDFLAGS_vmlinux
)
1265 vmlinux
: export LDFLAGS_vmlinux
= $(_LDFLAGS_vmlinux
)
1266 vmlinux
: vmlinux.o
$(KBUILD_LDS
) modpost
1267 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux
1269 # The actual objects are generated when descending,
1270 # make sure no implicit rule kicks in
1271 $(sort $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)): .
;
1273 filechk_kernel.release
= \
1274 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1276 # Store (new) KERNELRELEASE string in include/config/kernel.release
1277 include/config
/kernel.release
: FORCE
1278 $(call filechk
,kernel.release
)
1280 # Additional helpers built in scripts/
1281 # Carefully list dependencies so we do not try to build scripts twice
1284 scripts
: scripts_basic scripts_dtc
1285 $(Q
)$(MAKE
) $(build
)=$(@
)
1287 # Things we need to do before we recursively start building the kernel
1288 # or the modules are listed in "prepare".
1289 # A multi level approach is used. prepareN is processed before prepareN-1.
1290 # archprepare is used in arch Makefiles and when processed asm symlink,
1291 # version.h and scripts_basic is processed / created.
1293 PHONY
+= prepare archprepare
1295 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1296 asm-generic
$(version_h
) $(autoksyms_h
) include/generated
/utsrelease.h \
1297 include/generated
/compile.h
include/generated
/autoconf.h remove-stale-files
1299 prepare0
: archprepare
1300 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1301 $(Q
)$(MAKE
) $(build
)=. prepare
1303 # All the preparing..
1306 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
-v
1307 $(Q
)$(MAKE
) $(build
)=rust
1310 PHONY
+= remove-stale-files
1312 $(Q
)$(srctree
)/scripts
/remove-stale-files
1314 # Support for using generic headers in asm-generic
1315 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1317 PHONY
+= asm-generic uapi-asm-generic
1318 asm-generic
: uapi-asm-generic
1319 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1320 generic
=include/asm-generic
1322 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1323 generic
=include/uapi
/asm-generic
1325 # Generate some files
1326 # ---------------------------------------------------------------------------
1328 # KERNELRELEASE can change from a few different places, meaning version.h
1329 # needs to be updated, so this check is forced on all builds
1332 define filechk_utsrelease.h
1333 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1334 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1337 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1340 define filechk_version.h
1341 if
[ $(SUBLEVEL
) -gt
255 ]; then \
1342 echo \
#define LINUX_VERSION_CODE $(shell \
1343 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + 255); \
1345 echo \
#define LINUX_VERSION_CODE $(shell \
1346 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
1348 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1349 ((c) > 255 ? 255 : (c)))'; \
1350 echo \
#define LINUX_VERSION_MAJOR $(VERSION); \
1351 echo \
#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1352 echo \
#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1355 $(version_h
): PATCHLEVEL
:= $(or
$(PATCHLEVEL
), 0)
1356 $(version_h
): SUBLEVEL
:= $(or
$(SUBLEVEL
), 0)
1358 $(call filechk
,version.h
)
1360 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1361 $(call filechk
,utsrelease.h
)
1363 filechk_compile.h
= $(srctree
)/scripts
/mkcompile_h \
1364 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1366 include/generated
/compile.h
: FORCE
1367 $(call filechk
,compile.h
)
1371 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1372 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1374 # ---------------------------------------------------------------------------
1377 #Default location for installed headers
1378 export INSTALL_HDR_PATH
= $(objtree
)/usr
1380 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1381 cmd_headers_install
= \
1382 mkdir
-p
$(INSTALL_HDR_PATH
); \
1383 find usr
/include -type f
-name
'*.h' -print0 | \
1384 tar -czf
- --null
--no-recursion
--no-wildcards-match-slash
-T- | \
1385 tar -xzf
- --strip-components
=1 -C
$(INSTALL_HDR_PATH
)
1387 PHONY
+= headers_install
1388 headers_install
: headers
1389 $(call cmd
,headers_install
)
1391 PHONY
+= archheaders archscripts
1393 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1396 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1397 $(if
$(filter um
, $(SRCARCH
)), $(error Headers not exportable for UML
))
1398 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1399 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1400 $(Q
)$(MAKE
) $(hdr-inst
)=ubuntu
/include dst
=include oldheaders
=
1402 ifdef CONFIG_HEADERS_INSTALL
1406 PHONY
+= scripts_unifdef
1407 scripts_unifdef
: scripts_basic
1408 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1410 # ---------------------------------------------------------------------------
1413 # Many distributions have the custom install script, /sbin/installkernel.
1414 # If DKMS is installed, 'make install' will eventually recurse back
1415 # to this Makefile to build and install external modules.
1416 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1418 quiet_cmd_install
= INSTALL
$(INSTALL_PATH
)
1419 cmd_install
= unset sub_make_done
; $(srctree
)/scripts
/install.sh
1421 # ---------------------------------------------------------------------------
1424 ifdef CONFIG_OBJTOOL
1425 prepare
: tools
/objtool
1429 ifdef CONFIG_DEBUG_INFO_BTF
1430 prepare
: tools
/bpf
/resolve_btfids
1434 PHONY
+= resolve_btfids_clean
1436 resolve_btfids_O
= $(abspath
$(objtree
))/tools
/bpf
/resolve_btfids
1438 # tools/bpf/resolve_btfids directory might not exist
1439 # in output directory, skip its clean in that case
1440 resolve_btfids_clean
:
1441 ifneq ($(wildcard $(resolve_btfids_O
)),)
1442 $(Q
)$(MAKE
) -sC
$(srctree
)/tools
/bpf
/resolve_btfids O
=$(resolve_btfids_O
) clean
1445 # Clear a bunch of variables before executing the submake
1446 ifeq ($(quiet
),silent_
)
1451 $(Q
)mkdir
-p
$(objtree
)/tools
1452 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1455 $(Q
)mkdir
-p
$(objtree
)/tools
1456 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1458 # ---------------------------------------------------------------------------
1463 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1465 kselftest-
%: headers FORCE
1466 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1468 PHONY
+= kselftest-merge
1470 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1471 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config | \
1472 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-m
$(objtree
)/.config
1473 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1475 # ---------------------------------------------------------------------------
1478 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1479 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1485 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1487 %.dtbo
: dtbs_prepare
1488 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1490 PHONY
+= dtbs dtbs_prepare dtbs_install dtbs_check
1492 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1494 # include/config/kernel.release is actually needed when installing DTBs because
1495 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1496 # dtbs_install depend on it as dtbs_install may run as root.
1497 dtbs_prepare
: include/config
/kernel.release scripts_dtc
1499 ifneq ($(filter dtbs_check
, $(MAKECMDGOALS
)),)
1501 dtbs
: dt_binding_check
1507 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
) dst
=$(INSTALL_DTBS_PATH
)
1509 ifdef CONFIG_OF_EARLY_FLATTREE
1515 PHONY
+= scripts_dtc
1516 scripts_dtc
: scripts_basic
1517 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1519 ifneq ($(filter dt_binding_check
, $(MAKECMDGOALS
)),)
1520 export CHECK_DT_BINDING
=y
1523 PHONY
+= dt_binding_check
1524 dt_binding_check
: scripts_dtc
1525 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1527 PHONY
+= dt_compatible_check
1528 dt_compatible_check
: dt_binding_check
1529 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
$@
1531 # ---------------------------------------------------------------------------
1534 ifdef CONFIG_MODULES
1536 # By default, build modules as well
1540 # When we're building modules with modversions, we need to consider
1541 # the built-in objects during the descend as well, in order to
1542 # make sure the checksums are up to date before we record them.
1543 ifdef CONFIG_MODVERSIONS
1550 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES
1552 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1557 modules
: modules_prepare
1559 # Target to prepare building external modules
1560 modules_prepare
: prepare
1561 $(Q
)$(MAKE
) $(build
)=scripts scripts
/module.lds
1563 export modules_sign_only
:=
1565 ifeq ($(CONFIG_MODULE_SIG
),y
)
1566 PHONY
+= modules_sign
1567 modules_sign
: modules_install
1570 # modules_sign is a subset of modules_install.
1571 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1572 ifeq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1573 modules_sign_only
:= y
1578 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1579 modinst_pre
:= __modinst_pre
1582 modules_install
: $(modinst_pre
)
1583 PHONY
+= __modinst_pre
1585 @
rm -rf
$(MODLIB
)/kernel
1586 @
rm -f
$(MODLIB
)/source
1587 @mkdir
-p
$(MODLIB
)/kernel
1588 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1589 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1590 rm -f
$(MODLIB
)/build
; \
1591 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1593 @sed
's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order
> $(MODLIB
)/modules.order
1594 @cp
-f modules.builtin
$(MODLIB
)/
1595 @cp
-f
$(objtree
)/modules.builtin.modinfo
$(MODLIB
)/
1597 endif # CONFIG_MODULES
1600 # Cleaning is done on three levels.
1601 # make clean Delete most generated files
1602 # Leave enough to build external modules
1603 # make mrproper Delete the current configuration, and all generated files
1604 # make distclean Remove editor backup files, patch leftover files and the like
1606 # Directories & files removed with 'make clean'
1607 CLEAN_FILES
+= include/ksym vmlinux.symvers modules-only.symvers \
1608 modules.builtin modules.builtin.modinfo modules.nsdeps \
1609 compile_commands.json .thinlto-cache rust
/test rust
/doc \
1610 .vmlinux.objs .vmlinux.
export.c
1612 # Directories & files removed with 'make mrproper'
1613 MRPROPER_FILES
+= include/config
include/generated \
1614 arch
/$(SRCARCH
)/include/generated .objdiff \
1616 .config .config.old .version \
1618 certs
/signing_key.pem \
1622 rust
/target.json rust
/libmacros.so
1624 # clean - Delete most, but leave enough to build external modules
1626 clean: rm-files
:= $(CLEAN_FILES
)
1628 PHONY
+= archclean vmlinuxclean
1631 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1632 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1634 clean: archclean vmlinuxclean resolve_btfids_clean
1636 # mrproper - Delete all generated files, including .config
1638 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1639 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1641 PHONY
+= $(mrproper-dirs
) mrproper
1643 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1645 mrproper
: clean $(mrproper-dirs
)
1647 @find .
$(RCS_FIND_IGNORE
) \
1648 \
( -name
'*.rmeta' \
) \
1649 -type f
-print | xargs
rm -f
1656 @find .
$(RCS_FIND_IGNORE
) \
1657 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1658 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1659 -o
-name
'core' -o
-name
tags -o
-name TAGS
-o
-name
'cscope*' \
1660 -o
-name GPATH
-o
-name GRTAGS
-o
-name GSYMS
-o
-name GTAGS \
) \
1661 -type f
-print | xargs
rm -f
1664 # Packaging of the kernel to various formats
1665 # ---------------------------------------------------------------------------
1668 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1669 %pkg
: include/config
/kernel.release FORCE
1670 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1672 # Brief documentation of the typical targets used
1673 # ---------------------------------------------------------------------------
1675 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1676 boards
:= $(sort $(notdir $(boards
)))
1677 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1678 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1682 @echo
'Cleaning targets:'
1683 @echo
' clean - Remove most generated files but keep the config and'
1684 @echo
' enough build support to build external modules'
1685 @echo
' mrproper - Remove all generated files + config + various backup files'
1686 @echo
' distclean - mrproper + remove editor backup and patch files'
1688 @echo
'Configuration targets:'
1689 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1691 @echo
'Other generic targets:'
1692 @echo
' all - Build all targets marked with [*]'
1693 @echo
'* vmlinux - Build the bare kernel'
1694 @echo
'* modules - Build all modules'
1695 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1696 @echo
' dir/ - Build all files in dir and below'
1697 @echo
' dir/file.[ois] - Build specified target only'
1698 @echo
' dir/file.ll - Build the LLVM assembly file'
1699 @echo
' (requires compiler support for LLVM assembly generation)'
1700 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1701 @echo
' (requires a recent binutils and recent build (System.map))'
1702 @echo
' dir/file.ko - Build module including final link'
1703 @echo
' modules_prepare - Set up for building external modules'
1704 @echo
' tags/TAGS - Generate tags file for editors'
1705 @echo
' cscope - Generate cscope index'
1706 @echo
' gtags - Generate GNU GLOBAL index'
1707 @echo
' kernelrelease - Output the release version string (use with make -s)'
1708 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1709 @echo
' image_name - Output the image name (use with make -s)'
1710 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1711 echo
' (default: $(INSTALL_HDR_PATH))'; \
1713 @echo
'Static analysers:'
1714 @echo
' checkstack - Generate a list of stack hogs'
1715 @echo
' versioncheck - Sanity check on version.h usage'
1716 @echo
' includecheck - Check for duplicate included header files'
1717 @echo
' export_report - List the usages of all exported symbols'
1718 @echo
' headerdep - Detect inclusion cycles in headers'
1719 @echo
' coccicheck - Check with Coccinelle'
1720 @echo
' clang-analyzer - Check with clang static analyzer'
1721 @echo
' clang-tidy - Check with clang-tidy'
1724 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1726 @echo
'Kernel selftest:'
1727 @echo
' kselftest - Build and run kernel selftest'
1728 @echo
' Build, install, and boot kernel before'
1729 @echo
' running kselftest on it'
1730 @echo
' Run as root for full coverage'
1731 @echo
' kselftest-all - Build kernel selftest'
1732 @echo
' kselftest-install - Build and install kernel selftest'
1733 @echo
' kselftest-clean - Remove all generated kselftest files'
1734 @echo
' kselftest-merge - Merge all the config dependencies of'
1735 @echo
' kselftest to existing .config.'
1737 @echo
'Rust targets:'
1738 @echo
' rustavailable - Checks whether the Rust toolchain is'
1739 @echo
' available and, if not, explains why.'
1740 @echo
' rustfmt - Reformat all the Rust code in the kernel'
1741 @echo
' rustfmtcheck - Checks if all the Rust code in the kernel'
1742 @echo
' is formatted, printing a diff otherwise.'
1743 @echo
' rustdoc - Generate Rust documentation'
1744 @echo
' (requires kernel .config)'
1745 @echo
' rusttest - Runs the Rust tests'
1746 @echo
' (requires kernel .config; downloads external repos)'
1747 @echo
' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1748 @echo
' (requires kernel .config)'
1749 @echo
' dir/file.[os] - Build specified target only'
1750 @echo
' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1751 @echo
' Run with RUSTFMT=n to skip reformatting if needed.'
1752 @echo
' The output is not intended to be compilable.'
1753 @echo
' dir/file.ll - Build the LLVM assembly file'
1756 echo
'Devicetree:'; \
1757 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1758 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1759 echo
' dt_binding_check - Validate device tree binding documents'; \
1760 echo
' dtbs_check - Validate device tree source files';\
1763 @echo
'Userspace tools targets:'
1764 @echo
' use "make tools/help"'
1765 @echo
' or "cd tools; make help"'
1767 @echo
'Kernel packaging:'
1768 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1770 @echo
'Documentation targets:'
1771 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1773 @echo
'Architecture specific targets ($(SRCARCH)):'
1775 echo
' No architecture specific help defined for $(SRCARCH)')
1778 $(foreach b
, $(boards
), \
1779 printf
" %-27s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1781 @
$(if
$(board-dirs
), \
1782 $(foreach b
, $(board-dirs
), \
1783 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1784 printf
" %-16s - Show all of the above\\n" help-boards
; \
1787 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1788 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1789 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1790 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK'
1791 @echo
' (sparse by default)'
1792 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1793 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1794 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1795 @echo
' 1: warnings which may be relevant and do not occur too often'
1796 @echo
' 2: warnings which occur quite often but may still be relevant'
1797 @echo
' 3: more obscure warnings, can most likely be ignored'
1798 @echo
' e: warnings are being treated as errors'
1799 @echo
' Multiple levels can be combined with W=12 or W=123'
1801 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1802 @echo
'For further info see the ./README file'
1805 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1807 help-boards
: $(help-board-dirs
)
1809 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1811 $(help-board-dirs
): help-
%:
1812 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1813 @
$(if
$(boards-per-dir
), \
1814 $(foreach b
, $(boards-per-dir
), \
1815 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1819 # Documentation targets
1820 # ---------------------------------------------------------------------------
1821 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1822 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1823 PHONY
+= $(DOC_TARGETS
)
1825 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1829 # ---------------------------------------------------------------------------
1831 # "Is Rust available?" target
1832 PHONY
+= rustavailable
1834 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
-v
&& echo
"Rust is available!"
1836 # Documentation target
1838 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1841 $(Q
)$(MAKE
) $(build
)=rust
$@
1846 $(Q
)$(MAKE
) $(build
)=rust
$@
1848 # Formatting targets
1849 PHONY
+= rustfmt rustfmtcheck
1851 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1853 # We match using absolute paths since `find` does not resolve them
1854 # when matching, which is a problem when e.g. `srctree` is `..`.
1855 # We `grep` afterwards in order to remove the directory entry itself.
1857 $(Q
)find
$(abs_srctree
) -type f
-name
'*.rs' \
1858 -o
-path
$(abs_srctree
)/rust
/alloc
-prune \
1859 -o
-path
$(abs_objtree
)/rust
/test -prune \
1860 | grep
-Fv
$(abs_srctree
)/rust
/alloc \
1861 | grep
-Fv
$(abs_objtree
)/rust
/test \
1862 | grep
-Fv generated \
1863 | xargs
$(RUSTFMT
) $(rustfmt_flags
)
1865 rustfmtcheck
: rustfmt_flags
= --check
1866 rustfmtcheck
: rustfmt
1868 # IDE support targets
1869 PHONY
+= rust-analyzer
1871 $(Q
)$(MAKE
) $(build
)=rust
$@
1874 # ---------------------------------------------------------------------------
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
1888 # External module support.
1889 # When building external modules the kernel used as basis is considered
1890 # read-only, and no consistency checks are made and the make
1891 # system is not used on the basis kernel. If updates are required
1892 # in the basis kernel ordinary make commands (without M=...) must be used.
1894 # We are always building only modules.
1898 build-dir
:= $(KBUILD_EXTMOD
)
1900 compile_commands.json
: $(extmod_prefix
)compile_commands.json
1901 PHONY
+= compile_commands.json
1903 clean-dirs
:= $(KBUILD_EXTMOD
)
1904 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
$(KBUILD_EXTMOD
)/modules.nsdeps \
1905 $(KBUILD_EXTMOD
)/compile_commands.json
$(KBUILD_EXTMOD
)/.thinlto-cache
1908 # now expand this into a simple variable to reduce the cost of shell evaluations
1909 prepare
: CC_VERSION_TEXT
:= $(CC_VERSION_TEXT
)
1911 @if
[ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1912 echo
>&2 "warning: the compiler differs from the one used to build the kernel"; \
1913 echo
>&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1914 echo
>&2 " You are using: $(CC_VERSION_TEXT)"; \
1919 @echo
' Building external modules.'
1920 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1922 @echo
' modules - default target, build the module(s)'
1923 @echo
' modules_install - install the module'
1924 @echo
' clean - remove generated files in module directory only'
1927 endif # KBUILD_EXTMOD
1929 # ---------------------------------------------------------------------------
1932 PHONY
+= modules modules_install modules_prepare
1934 ifdef CONFIG_MODULES
1936 $(MODORDER
): $(build-dir
)
1939 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1940 # This is solely useful to speed up test compiles.
1942 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
1943 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
1946 PHONY
+= modules_check
1947 modules_check
: $(MODORDER
)
1948 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
$<
1950 quiet_cmd_depmod
= DEPMOD
$(MODLIB
)
1951 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1955 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1958 else # CONFIG_MODULES
1960 # Modules not configured
1961 # ---------------------------------------------------------------------------
1963 modules modules_install
:
1965 @echo
>&2 '*** The present kernel configuration has modules disabled.'
1966 @echo
>&2 '*** To use the module feature, please run "make menuconfig" etc.'
1967 @echo
>&2 '*** to enable CONFIG_MODULES.'
1973 endif # CONFIG_MODULES
1976 modpost
: $(if
$(single-build
),, $(if
$(KBUILD_BUILTIN
), vmlinux.o
)) \
1977 $(if
$(KBUILD_MODULES
), modules_check
)
1978 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1981 # ---------------------------------------------------------------------------
1982 # To build individual files in subdirectories, you can do like this:
1984 # make foo/bar/baz.s
1986 # The supported suffixes for single-target are listed in 'single-targets'
1988 # To build only under specific subdirectories, you can do like this:
1994 # .ko is special because modpost is needed
1995 single-ko
:= $(sort $(filter %.ko
, $(MAKECMDGOALS
)))
1996 single-no-ko
:= $(filter-out $(single-ko
), $(MAKECMDGOALS
)) \
1997 $(foreach x
, o mod
, $(patsubst %.ko
, %.
$x, $(single-ko
)))
1999 $(single-ko
): single_modules
2001 $(single-no-ko
): $(build-dir
)
2004 # Remove MODORDER when done because it is not the real one.
2005 PHONY
+= single_modules
2006 single_modules
: $(single-no-ko
) modules_prepare
2007 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod_prefix
)$(m
:%.ko
=%.o
);) } > $(MODORDER
)
2008 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
2009 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
2010 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
2012 $(Q
)rm -f
$(MODORDER
)
2014 single-goals
:= $(addprefix $(build-dir
)/, $(single-no-ko
))
2020 # Preset locale variables to speed up the build process. Limit locale
2021 # tweaks to this spot to avoid wrong language settings when running
2022 # make menuconfig etc.
2023 # Error messages still appears in the original language
2024 PHONY
+= $(build-dir
)
2025 $(build-dir
): prepare
2026 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1 need-modorder
=1 $(single-goals
)
2028 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
2029 PHONY
+= $(clean-dirs
) clean
2031 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
2033 clean: $(clean-dirs
)
2035 @find
$(or
$(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
2036 \
( -name
'*.[aios]' -o
-name
'*.rsi' -o
-name
'*.ko' -o
-name
'.*.cmd' \
2038 -o
-name
'*.dtb' -o
-name
'*.dtbo' \
2039 -o
-name
'*.dtb.S' -o
-name
'*.dtbo.S' \
2040 -o
-name
'*.dt.yaml' \
2041 -o
-name
'*.dwo' -o
-name
'*.lst' \
2042 -o
-name
'*.su' -o
-name
'*.mod' -o
-name
'*.usyms' \
2043 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
2044 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
2045 -o
-name
'*.asn1.[ch]' \
2046 -o
-name
'*.symtypes' -o
-name
'modules.order' \
2048 -o
-name
'*.c.[012]*.*' \
2051 -o
-name
'*.*.symversions' \
) -type f
-print | xargs
rm -f
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
$$(find .
-name
'*.ko') | \
2130 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
2133 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
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.