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 $(if $(filter __%, $(MAKECMDGOALS)), \
15 $(error targets prefixed with '__
' are only for internal use))
17 # That's our default target when none is given on the command line
21 # We are using a recursive build, so we need to do a little thinking
22 # to get the ordering right.
24 # Most importantly: sub-Makefiles should only ever modify files in
25 # their own directory. If in some directory we have a dependency on
26 # a file in another dir (which doesn't happen often, but it's often
27 # unavoidable when linking the built-in.a targets which finally
28 # turn into vmlinux), we will call a sub make in that other dir, and
29 # after that we are sure that everything which is in that other dir
32 # The only cases where we need to modify files which have global
33 # effects are thus separated out and done before the recursive
34 # descending is started. They are now explicitly listed as the
37 ifneq ($(sub_make_done
),1)
39 # Do not use make's built-in rules and variables
40 # (this increases performance and avoids hard-to-debug behaviour)
43 # Avoid funny character set dependencies
47 export LC_COLLATE LC_NUMERIC
49 # Avoid interference with shell env settings
53 # ---------------------------------------------------------------------------
55 # Normally, we echo the whole command before executing it. By making
56 # that echo $($(quiet)$(cmd)), we now have the possibility to set
57 # $(quiet) to choose other forms of output instead, e.g.
59 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
62 # If $(quiet) is empty, the whole command will be printed.
63 # If it is set to "quiet_", only the short version will be printed.
64 # If it is set to "silent_", nothing will be printed at all, since
65 # the variable $(silent_cmd_cc_o_c) doesn't exist.
67 # A simple variant is to prefix commands with $(Q) - that's useful
68 # for commands that shall be hidden in non-verbose mode.
72 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
74 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
76 # To put more focus on warnings, be less verbose as default
77 # Use 'make V=1' to see the full commands
79 ifeq ("$(origin V)", "command line")
86 ifeq ($(KBUILD_VERBOSE
),1)
94 # If the user is running make -s (silent mode), suppress echoing of
97 ifneq ($(findstring s
,$(filter-out --%,$(MAKEFLAGS
))),)
102 export quiet Q KBUILD_VERBOSE
104 # Call a source code checker (by default, "sparse") as part of the
107 # Use 'make C=1' to enable checking of only re-compiled files.
108 # Use 'make C=2' to enable checking of *all* source files, regardless
109 # of whether they are re-compiled or not.
111 # See the file "Documentation/dev-tools/sparse.rst" for more details,
112 # including where to get the "sparse" utility.
114 ifeq ("$(origin C)", "command line")
115 KBUILD_CHECKSRC
= $(C
)
117 ifndef KBUILD_CHECKSRC
121 export KBUILD_CHECKSRC
123 # Enable "clippy" (a linter) as part of the Rust compilation.
125 # Use 'make CLIPPY=1' to enable it.
126 ifeq ("$(origin CLIPPY)", "command line")
127 KBUILD_CLIPPY
:= $(CLIPPY
)
132 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
133 # directory of external module to build. Setting M= takes precedence.
134 ifeq ("$(origin M)", "command line")
135 KBUILD_EXTMOD
:= $(M
)
138 $(if
$(word 2, $(KBUILD_EXTMOD
)), \
139 $(error building multiple external modules is not supported
))
141 $(foreach x
, % :, $(if
$(findstring $x, $(KBUILD_EXTMOD
)), \
142 $(error module directory path cannot contain
'$x')))
144 # Remove trailing slashes
145 ifneq ($(filter %/, $(KBUILD_EXTMOD
)),)
146 KBUILD_EXTMOD
:= $(shell dirname
$(KBUILD_EXTMOD
).
)
151 # Kbuild will save output files in the current working directory.
152 # This does not need to match to the root of the kernel source tree.
154 # For example, you can do this:
156 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
158 # If you want to save output files in a different location, there are
159 # two syntaxes to specify it.
162 # Use "make O=dir/to/store/output/files/"
164 # 2) Set KBUILD_OUTPUT
165 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
166 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
168 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
171 # Do we want to change the working directory?
172 ifeq ("$(origin O)", "command line")
173 KBUILD_OUTPUT
:= $(O
)
176 ifneq ($(KBUILD_OUTPUT
),)
177 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
178 # expand a shell special character '~'. We use a somewhat tedious way here.
179 abs_objtree
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) && pwd
)
180 $(if
$(abs_objtree
),, \
181 $(error failed to create output directory
"$(KBUILD_OUTPUT)"))
183 # $(realpath ...) resolves symlinks
184 abs_objtree
:= $(realpath
$(abs_objtree
))
186 abs_objtree
:= $(CURDIR
)
187 endif # ifneq ($(KBUILD_OUTPUT),)
189 ifeq ($(abs_objtree
),$(CURDIR
))
190 # Suppress "Entering directory ..." unless we are changing the work directory.
191 MAKEFLAGS
+= --no-print-directory
196 this-makefile
:= $(lastword
$(MAKEFILE_LIST
))
197 abs_srctree
:= $(realpath
$(dir $(this-makefile
)))
199 ifneq ($(words $(subst :, ,$(abs_srctree
))), 1)
200 $(error source directory cannot contain spaces or colons
)
203 ifneq ($(abs_srctree
),$(abs_objtree
))
204 # Look for make include files relative to root of kernel src
206 # --included-dir is added for backward compatibility, but you should not rely on
207 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
208 MAKEFLAGS
+= --include-dir
=$(abs_srctree
)
211 ifneq ($(filter 3.
%,$(MAKE_VERSION
)),)
212 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
213 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
215 # Cancel implicit rules for this Makefile.
219 export abs_srctree abs_objtree
220 export sub_make_done
:= 1
222 ifeq ($(need-sub-make
),1)
224 PHONY
+= $(MAKECMDGOALS
) __sub-make
226 $(filter-out $(this-makefile
), $(MAKECMDGOALS
)) __all
: __sub-make
229 # Invoke a second make in the output directory, passing relevant variables
231 $(Q
)$(MAKE
) -C
$(abs_objtree
) -f
$(abs_srctree
)/Makefile
$(MAKECMDGOALS
)
233 endif # need-sub-make
234 endif # sub_make_done
236 # We process the rest of the Makefile if this is the final invocation of make
237 ifeq ($(need-sub-make
),)
239 # Do not print "Entering directory ...",
240 # but we want to display it when entering to the output directory
241 # so that IDEs/editors are able to understand relative filenames.
242 MAKEFLAGS
+= --no-print-directory
244 ifeq ($(abs_srctree
),$(abs_objtree
))
245 # building in the source tree
247 building_out_of_srctree
:=
249 ifeq ($(abs_srctree
)/,$(dir $(abs_objtree
)))
250 # building in a subdirectory of the source tree
253 srctree
:= $(abs_srctree
)
255 building_out_of_srctree
:= 1
258 ifneq ($(KBUILD_ABS_SRCTREE
),)
259 srctree
:= $(abs_srctree
)
265 export building_out_of_srctree srctree objtree VPATH
267 # To make sure we do not include .config for any of the *config targets
268 # catch them early, and hand them over to scripts/kconfig/Makefile
269 # It is allowed to specify more targets when calling make, including
270 # mixing *config targets and build targets.
271 # For example 'make oldconfig all'.
272 # Detect when mixed targets is specified, and make a second invocation
273 # of make so .config is not included in this case either (for *config).
275 version_h
:= include/generated
/uapi
/linux
/version.h
277 clean-targets
:= %clean mrproper cleandocs
278 no-dot-config-targets
:= $(clean-targets
) \
279 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
280 $(version_h
) headers headers_
% archheaders archscripts \
281 %asm-generic kernelversion
%src-pkg dt_binding_check \
282 outputmakefile rustavailable rustfmt rustfmtcheck
283 # Installation targets should not require compiler. Unfortunately, vdso_install
284 # is an exception where build artifacts may be updated. This must be fixed.
285 no-compiler-targets
:= $(no-dot-config-targets
) install dtbs_install \
286 headers_install modules_install kernelrelease image_name
287 no-sync-config-targets
:= $(no-dot-config-targets
) %install kernelrelease \
289 single-targets
:= %.a
%.i
%.rsi
%.ko
%.lds
%.ll
%.lst
%.mod
%.o
%.s
%.symtypes
%/
298 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
299 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
304 ifneq ($(filter $(no-compiler-targets
), $(MAKECMDGOALS
)),)
305 ifeq ($(filter-out $(no-compiler-targets
), $(MAKECMDGOALS
)),)
310 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
311 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
316 ifneq ($(KBUILD_EXTMOD
),)
320 ifeq ($(KBUILD_EXTMOD
),)
321 ifneq ($(filter %config
,$(MAKECMDGOALS
)),)
323 ifneq ($(words $(MAKECMDGOALS
)),1)
329 # We cannot build single targets and the others at the same time
330 ifneq ($(filter $(single-targets
), $(MAKECMDGOALS
)),)
332 ifneq ($(filter-out $(single-targets
), $(MAKECMDGOALS
)),)
337 # For "make -j clean all", "make -j mrproper defconfig all", etc.
338 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
339 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
344 # install and modules_install need also be processed one by one
345 ifneq ($(filter install,$(MAKECMDGOALS
)),)
346 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
352 # ===========================================================================
353 # We're called with mixed targets (*config and build targets).
354 # Handle them one by one.
356 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
358 $(MAKECMDGOALS
): __build_one_by_one
363 for i in
$(MAKECMDGOALS
); do \
364 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
369 include $(srctree
)/scripts
/Kbuild.
include
371 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
372 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
373 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
374 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
376 include $(srctree
)/scripts
/subarch.
include
378 # Cross compiling and selecting different set of gcc/bin-utils
379 # ---------------------------------------------------------------------------
381 # When performing cross compilation for other architectures ARCH shall be set
382 # to the target architecture. (See arch/* for the possibilities).
383 # ARCH can be set during invocation of make:
385 # Another way is to have ARCH set in the environment.
386 # The default ARCH is the host where make is executed.
388 # CROSS_COMPILE specify the prefix used for all executables used
389 # during compilation. Only gcc and related bin-utils executables
390 # are prefixed with $(CROSS_COMPILE).
391 # CROSS_COMPILE can be set on the command line
392 # make CROSS_COMPILE=ia64-linux-
393 # Alternatively CROSS_COMPILE can be set in the environment.
394 # Default value for CROSS_COMPILE is not to prefix executables
395 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
398 # Architecture as present in compile.h
399 UTS_MACHINE
:= $(ARCH
)
402 # Additional ARCH settings for x86
406 ifeq ($(ARCH
),x86_64
)
410 # Additional ARCH settings for sparc
411 ifeq ($(ARCH
),sparc32
)
414 ifeq ($(ARCH
),sparc64
)
418 # Additional ARCH settings for parisc
419 ifeq ($(ARCH
),parisc64
)
423 export cross_compiling
:=
424 ifneq ($(SRCARCH
),$(SUBARCH
))
428 KCONFIG_CONFIG ?
= .config
429 export KCONFIG_CONFIG
431 # SHELL used by kbuild
434 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
435 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
436 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
439 ifneq ($(filter %/,$(LLVM
)),)
440 LLVM_PREFIX
:= $(LLVM
)
441 else ifneq ($(filter -%,$(LLVM
)),)
442 LLVM_SUFFIX
:= $(LLVM
)
445 HOSTCC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
446 HOSTCXX
= $(LLVM_PREFIX
)clang
++$(LLVM_SUFFIX
)
452 HOSTPKG_CONFIG
= pkg-config
454 KBUILD_USERHOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes \
455 -O2
-fomit-frame-pointer
-std
=gnu11 \
456 -Wdeclaration-after-statement
457 KBUILD_USERCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(USERCFLAGS
)
458 KBUILD_USERLDFLAGS
:= $(USERLDFLAGS
)
460 # These flags apply to all Rust code in the tree, including the kernel and
462 export rust_common_flags
:= --edition
=2021 \
463 -Zbinary_dep_depinfo
=y \
464 -Dunsafe_op_in_unsafe_fn
-Drust_2018_idioms \
465 -Dunreachable_pub
-Dnon_ascii_idents \
467 -Drustdoc
::missing_crate_level_docs \
468 -Dclippy
::correctness
-Dclippy
::style \
469 -Dclippy
::suspicious
-Dclippy
::complexity \
471 -Dclippy
::let_unit_value
-Dclippy
::mut_mut \
472 -Dclippy
::needless_bitwise_bool \
473 -Dclippy
::needless_continue \
476 KBUILD_HOSTCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(HOST_LFS_CFLAGS
) $(HOSTCFLAGS
)
477 KBUILD_HOSTCXXFLAGS
:= -Wall
-O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
478 KBUILD_HOSTRUSTFLAGS
:= $(rust_common_flags
) -O
-Cstrip
=debuginfo \
479 -Zallow-features
= $(HOSTRUSTFLAGS
)
480 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
481 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
483 # Make variables (CC, etc...)
486 CC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
487 LD
= $(LLVM_PREFIX
)ld.lld
$(LLVM_SUFFIX
)
488 AR
= $(LLVM_PREFIX
)llvm-ar
$(LLVM_SUFFIX
)
489 NM
= $(LLVM_PREFIX
)llvm-nm
$(LLVM_SUFFIX
)
490 OBJCOPY
= $(LLVM_PREFIX
)llvm-objcopy
$(LLVM_SUFFIX
)
491 OBJDUMP
= $(LLVM_PREFIX
)llvm-objdump
$(LLVM_SUFFIX
)
492 READELF
= $(LLVM_PREFIX
)llvm-readelf
$(LLVM_SUFFIX
)
493 STRIP
= $(LLVM_PREFIX
)llvm-strip
$(LLVM_SUFFIX
)
495 CC
= $(CROSS_COMPILE
)gcc
496 LD
= $(CROSS_COMPILE
)ld
497 AR
= $(CROSS_COMPILE
)ar
498 NM
= $(CROSS_COMPILE
)nm
499 OBJCOPY
= $(CROSS_COMPILE
)objcopy
500 OBJDUMP
= $(CROSS_COMPILE
)objdump
501 READELF
= $(CROSS_COMPILE
)readelf
502 STRIP
= $(CROSS_COMPILE
)strip
507 CLIPPY_DRIVER
= clippy-driver
511 RESOLVE_BTFIDS
= $(objtree
)/tools
/bpf
/resolve_btfids
/resolve_btfids
515 INSTALLKERNEL
:= installkernel
529 PAHOLE_FLAGS
= $(shell PAHOLE
=$(PAHOLE
) $(srctree
)/scripts
/pahole-flags.sh
)
531 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
532 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
541 export LDFLAGS_vmlinux
=
543 # Use USERINCLUDE when you must reference the UAPI directories only.
545 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
546 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
547 -I
$(srctree
)/include/uapi \
548 -I
$(objtree
)/include/generated
/uapi \
549 -include $(srctree
)/include/linux
/compiler-version.h \
550 -include $(srctree
)/include/linux
/kconfig.h
552 # Use LINUXINCLUDE when you must reference the include/ directory.
553 # Needed to be compatible with the O= option
555 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
556 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
557 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
558 -I
$(objtree
)/include \
561 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
562 KBUILD_CFLAGS
:= -Wall
-Wundef
-Werror
=strict-prototypes
-Wno-trigraphs \
563 -fno-strict-aliasing
-fno-common
-fshort-wchar
-fno-PIE \
564 -Werror
=implicit-function-declaration
-Werror
=implicit-int \
565 -Werror
=return-type
-Wno-format-security \
567 KBUILD_CPPFLAGS
:= -D__KERNEL__
568 KBUILD_RUSTFLAGS
:= $(rust_common_flags
) \
569 --target
=$(objtree
)/rust
/target.json \
570 -Cpanic
=abort
-Cembed-bitcode
=n
-Clto
=n \
571 -Cforce-unwind-tables
=n
-Ccodegen-units
=1 \
572 -Csymbol-mangling-version
=v0 \
573 -Crelocation-model
=static \
574 -Zfunction-sections
=n \
575 -Dclippy
::float_arithmetic
577 KBUILD_AFLAGS_KERNEL
:=
578 KBUILD_CFLAGS_KERNEL
:=
579 KBUILD_RUSTFLAGS_KERNEL
:=
580 KBUILD_AFLAGS_MODULE
:= -DMODULE
581 KBUILD_CFLAGS_MODULE
:= -DMODULE
582 KBUILD_RUSTFLAGS_MODULE
:= --cfg MODULE
583 KBUILD_LDFLAGS_MODULE
:=
587 ifeq ($(KBUILD_CLIPPY
),1)
588 RUSTC_OR_CLIPPY_QUIET
:= CLIPPY
589 RUSTC_OR_CLIPPY
= $(CLIPPY_DRIVER
)
591 RUSTC_OR_CLIPPY_QUIET
:= RUSTC
592 RUSTC_OR_CLIPPY
= $(RUSTC
)
599 # Allows the usage of unstable features in stable compilers.
600 export RUSTC_BOOTSTRAP
:= 1
602 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
603 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
604 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
605 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
606 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
607 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
608 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
609 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
611 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
612 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
613 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
614 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
615 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
616 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
619 # Files to ignore in find ... statements
621 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
622 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
624 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
625 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
627 # ===========================================================================
628 # Rules shared between *config targets and build targets
630 # Basic helpers built in scripts/basic/
631 PHONY
+= scripts_basic
633 $(Q
)$(MAKE
) $(build
)=scripts
/basic
635 PHONY
+= outputmakefile
636 ifdef building_out_of_srctree
637 # Before starting out-of-tree build, make sure the source tree is clean.
638 # outputmakefile generates a Makefile in the output directory, if using a
639 # separate output directory. This allows convenient use of make in the
641 # At the same time when output Makefile generated, generate .gitignore to
642 # ignore whole output directory
644 quiet_cmd_makefile
= GEN Makefile
646 echo
"\# Automatically generated by $(srctree)/Makefile: don't edit"; \
647 echo
"include $(srctree)/Makefile"; \
651 @if
[ -f
$(srctree
)/.config
-o \
652 -d
$(srctree
)/include/config
-o \
653 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
655 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
656 echo
>&2 "*** in $(abs_srctree)";\
660 $(Q
)ln
-fsn
$(srctree
) source
662 $(Q
)test -e .gitignore || \
663 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
666 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
667 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
668 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
669 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
670 CC_VERSION_TEXT
= $(subst $(pound
),,$(shell LC_ALL
=C
$(CC
) --version
2>/dev
/null | head
-n
1))
672 ifneq ($(findstring clang
,$(CC_VERSION_TEXT
)),)
673 include $(srctree
)/scripts
/Makefile.clang
676 # Include this also for config targets because some architectures need
677 # cc-cross-prefix to determine CROSS_COMPILE.
679 include $(srctree
)/scripts
/Makefile.compiler
683 # ===========================================================================
684 # *config targets only - make sure prerequisites are updated, and descend
685 # in scripts/kconfig to make the *config target
687 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
688 # KBUILD_DEFCONFIG may point out an alternative default configuration
689 # used for 'make defconfig'
690 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
691 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
693 config
: outputmakefile scripts_basic FORCE
694 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
696 %config
: outputmakefile scripts_basic FORCE
697 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
700 # ===========================================================================
701 # Build targets only - this includes vmlinux, arch specific targets, clean
702 # targets and others. In general all targets except *config targets.
704 # If building an external module we do not care about the all: rule
705 # but instead __all depend on modules
707 ifeq ($(KBUILD_EXTMOD
),)
715 # Decide whether to build built-in, modular, or both.
716 # Normally, just do built-in.
721 # If we have only "make modules", don't compile built-in objects.
722 ifeq ($(MAKECMDGOALS
),modules
)
726 # If we have "make <whatever> modules", compile modules
727 # in addition to whatever we do anyway.
728 # Just "make" or "make all" shall build modules as well
730 ifneq ($(filter all modules nsdeps
%compile_commands.json clang-
%,$(MAKECMDGOALS
)),)
734 ifeq ($(MAKECMDGOALS
),)
738 export KBUILD_MODULES KBUILD_BUILTIN
741 include include/config
/auto.conf
744 ifeq ($(KBUILD_EXTMOD
),)
745 # Objects we will link into vmlinux / subdirs we need to visit
749 endif # KBUILD_EXTMOD
751 # The all: target is the default when no target is given on the
753 # This allow a user to issue only 'make' to build a kernel including modules
754 # Defaults to vmlinux, but the arch makefile usually adds further targets
757 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
758 ifdef CONFIG_CC_IS_GCC
759 CFLAGS_GCOV
+= -fno-tree-loop-im
763 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
764 ifdef CONFIG_FUNCTION_TRACER
765 CC_FLAGS_FTRACE
:= -pg
768 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
771 ifdef may-sync-config
772 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
773 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
774 # because some architectures define CROSS_COMPILE there.
775 include include/config
/auto.conf.cmd
779 @echo
>&2 '*** Configuration file "$@" not found!'
781 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
782 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
786 # The actual configuration files used during the build are stored in
787 # include/generated/ and include/config/. Update them if .config is newer than
788 # include/config/auto.conf (which mirrors .config).
790 # This exploits the 'multi-target pattern rule' trick.
791 # The syncconfig should be executed only once to make all the targets.
792 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
794 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
795 # so you cannot notice that Kconfig is waiting for the user input.
796 %/config
/auto.conf
%/config
/auto.conf.cmd
%/generated
/autoconf.h
%/generated
/rustc_cfg
: $(KCONFIG_CONFIG
)
797 $(Q
)$(kecho
) " SYNC $@"
798 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
799 else # !may-sync-config
800 # External modules and some install targets need include/generated/autoconf.h
801 # and include/config/auto.conf but do not care if they are up-to-date.
802 # Use auto.conf to trigger the test
803 PHONY
+= include/config
/auto.conf
805 include/config
/auto.conf
:
806 @
test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
808 echo
>&2 " ERROR: Kernel configuration is invalid."; \
809 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
810 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
814 endif # may-sync-config
817 KBUILD_CFLAGS
+= -fno-delete-null-pointer-checks
818 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
819 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
820 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
821 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
823 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
825 KBUILD_RUSTFLAGS
+= -Copt-level
=2
826 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
828 KBUILD_RUSTFLAGS
+= -Copt-level
=s
831 # Always set `debug-assertions` and `overflow-checks` because their default
832 # depends on `opt-level` and `debug-assertions`, respectively.
833 KBUILD_RUSTFLAGS
+= -Cdebug-assertions
=$(if
$(CONFIG_RUST_DEBUG_ASSERTIONS
),y
,n
)
834 KBUILD_RUSTFLAGS
+= -Coverflow-checks
=$(if
$(CONFIG_RUST_OVERFLOW_CHECKS
),y
,n
)
836 # Tell gcc to never replace conditional load with a non-conditional one
837 ifdef CONFIG_CC_IS_GCC
838 # gcc-10 renamed --param=allow-store-data-races=0 to
839 # -fno-allow-store-data-races.
840 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
841 KBUILD_CFLAGS
+= $(call cc-option
,-fno-allow-store-data-races
)
844 ifdef CONFIG_READABLE_ASM
845 # Disable optimizations that make assembler listings hard to read.
846 # reorder blocks reorders the control in the function
847 # ipa clone creates specialized cloned functions
848 # partial inlining inlines only parts of functions
849 KBUILD_CFLAGS
+= -fno-reorder-blocks
-fno-ipa-cp-clone
-fno-partial-inlining
852 ifneq ($(CONFIG_FRAME_WARN
),0)
853 KBUILD_CFLAGS
+= -Wframe-larger-than
=$(CONFIG_FRAME_WARN
)
856 stackp-flags-y
:= -fno-stack-protector
857 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
858 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
860 KBUILD_CFLAGS
+= $(stackp-flags-y
)
862 KBUILD_CFLAGS-
$(CONFIG_WERROR
) += -Werror
863 KBUILD_CFLAGS-
$(CONFIG_CC_NO_ARRAY_BOUNDS
) += -Wno-array-bounds
865 KBUILD_RUSTFLAGS-
$(CONFIG_WERROR
) += -Dwarnings
866 KBUILD_RUSTFLAGS
+= $(KBUILD_RUSTFLAGS-y
)
868 ifdef CONFIG_CC_IS_CLANG
869 KBUILD_CPPFLAGS
+= -Qunused-arguments
870 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
871 KBUILD_CFLAGS
+= -Wno-gnu
874 # gcc inanely warns about local variables called 'main'
875 KBUILD_CFLAGS
+= -Wno-main
878 # These warnings generated too much noise in a regular build.
879 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
880 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
881 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
883 # These result in bogus false positives
884 KBUILD_CFLAGS
+= $(call cc-disable-warning
, dangling-pointer
)
886 ifdef CONFIG_FRAME_POINTER
887 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
888 KBUILD_RUSTFLAGS
+= -Cforce-frame-pointers
=y
890 # Some targets (ARM with Thumb2, for example), can't be built with frame
891 # pointers. For those, we don't have FUNCTION_TRACER automatically
892 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
893 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
894 # -fomit-frame-pointer with FUNCTION_TRACER.
895 # In the Rust target specification, "frame-pointer" is set explicitly
897 ifndef CONFIG_FUNCTION_TRACER
898 KBUILD_CFLAGS
+= -fomit-frame-pointer
902 # Initialize all stack variables with a 0xAA pattern.
903 ifdef CONFIG_INIT_STACK_ALL_PATTERN
904 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
907 # Initialize all stack variables with a zero value.
908 ifdef CONFIG_INIT_STACK_ALL_ZERO
909 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=zero
910 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
911 # https://github.com/llvm/llvm-project/issues/44842
912 KBUILD_CFLAGS
+= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
916 # While VLAs have been removed, GCC produces unreachable stack probes
917 # for the randomize_kstack_offset feature. Disable it for all compilers.
918 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-clash-protection
)
920 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
921 ifdef CONFIG_ZERO_CALL_USED_REGS
922 KBUILD_CFLAGS
+= -fzero-call-used-regs
=used-gpr
925 ifdef CONFIG_FUNCTION_TRACER
926 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
927 CC_FLAGS_FTRACE
+= -mrecord-mcount
928 ifdef CONFIG_HAVE_NOP_MCOUNT
929 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
930 CC_FLAGS_FTRACE
+= -mnop-mcount
931 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
935 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
936 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
938 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
939 ifdef CONFIG_HAVE_C_RECORDMCOUNT
940 BUILD_C_RECORDMCOUNT
:= y
941 export BUILD_C_RECORDMCOUNT
944 ifdef CONFIG_HAVE_FENTRY
945 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
946 ifeq ($(call cc-option-yn
, -mfentry
),y
)
947 CC_FLAGS_FTRACE
+= -mfentry
948 CC_FLAGS_USING
+= -DCC_USING_FENTRY
951 export CC_FLAGS_FTRACE
952 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
953 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
956 # We trigger additional mismatches with less inlining
957 ifdef CONFIG_DEBUG_SECTION_MISMATCH
958 KBUILD_CFLAGS
+= -fno-inline-functions-called-once
961 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
962 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
963 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
964 KBUILD_RUSTFLAGS_KERNEL
+= -Zfunction-sections
=y
965 LDFLAGS_vmlinux
+= --gc-sections
968 ifdef CONFIG_SHADOW_CALL_STACK
969 CC_FLAGS_SCS
:= -fsanitize
=shadow-call-stack
970 KBUILD_CFLAGS
+= $(CC_FLAGS_SCS
)
974 ifdef CONFIG_LTO_CLANG
975 ifdef CONFIG_LTO_CLANG_THIN
976 CC_FLAGS_LTO
:= -flto
=thin
-fsplit-lto-unit
977 KBUILD_LDFLAGS
+= --thinlto-cache-dir
=$(extmod_prefix
).thinlto-cache
979 CC_FLAGS_LTO
:= -flto
981 CC_FLAGS_LTO
+= -fvisibility
=hidden
983 # Limit inlining across translation units to reduce binary size
984 KBUILD_LDFLAGS
+= -mllvm
-import-instr-limit
=5
986 # Check for frame size exceeding threshold during prolog/epilog insertion
987 # when using lld < 13.0.0.
988 ifneq ($(CONFIG_FRAME_WARN
),0)
989 ifeq ($(shell test $(CONFIG_LLD_VERSION
) -lt
130000; echo
$$?
),0)
990 KBUILD_LDFLAGS
+= -plugin-opt
=-warn-stack-size
=$(CONFIG_FRAME_WARN
)
996 KBUILD_CFLAGS
+= -fno-lto
$(CC_FLAGS_LTO
)
997 KBUILD_AFLAGS
+= -fno-lto
1001 ifdef CONFIG_CFI_CLANG
1002 CC_FLAGS_CFI
:= -fsanitize
=kcfi
1003 KBUILD_CFLAGS
+= $(CC_FLAGS_CFI
)
1007 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
1008 KBUILD_CFLAGS
+= -falign-functions
=64
1011 # arch Makefile may override CC so keep this after arch Makefile is included
1012 NOSTDINC_FLAGS
+= -nostdinc
1014 # warn about C99 declaration after statement
1015 KBUILD_CFLAGS
+= -Wdeclaration-after-statement
1017 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1018 KBUILD_CFLAGS
+= -Wvla
1020 # disable pointer signed / unsigned warnings in gcc 4.0
1021 KBUILD_CFLAGS
+= -Wno-pointer-sign
1023 # In order to make sure new function cast mismatches are not introduced
1024 # in the kernel (to avoid tripping CFI checking), the kernel should be
1025 # globally built with -Wcast-function-type.
1026 KBUILD_CFLAGS
+= $(call cc-option
, -Wcast-function-type
)
1028 # disable stringop warnings in gcc 8+
1029 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
1031 # We'll want to enable this eventually, but it's not going away for 5.7 at least
1032 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-overflow
)
1034 # Another good warning that we'll want to enable eventually
1035 KBUILD_CFLAGS
+= $(call cc-disable-warning
, restrict
)
1037 # Enabled with W=2, disabled by default as noisy
1038 ifdef CONFIG_CC_IS_GCC
1039 KBUILD_CFLAGS
+= -Wno-maybe-uninitialized
1042 # The allocators already balk at large sizes, so silence the compiler
1043 # warnings for bounds checks involving those possible values. While
1044 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
1045 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
1046 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1047 # doesn't work (as it is documented to), silently resolving to "0" prior to
1048 # version 9.1 (and producing an error more recently). Numeric values larger
1049 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1050 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1051 # choice, we must perform a versioned check to disable this warning.
1052 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
1053 KBUILD_CFLAGS-
$(call gcc-min-version
, 90100) += -Wno-alloc-size-larger-than
1054 KBUILD_CFLAGS
+= $(KBUILD_CFLAGS-y
) $(CONFIG_CC_IMPLICIT_FALLTHROUGH
)
1056 # disable invalid "can't wrap" optimizations for signed / pointers
1057 KBUILD_CFLAGS
+= -fno-strict-overflow
1059 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1060 KBUILD_CFLAGS
+= -fno-stack-check
1062 # conserve stack if available
1063 ifdef CONFIG_CC_IS_GCC
1064 KBUILD_CFLAGS
+= -fconserve-stack
1067 # Prohibit date/time macros, which would make the build non-deterministic
1068 KBUILD_CFLAGS
+= -Werror
=date-time
1070 # enforce correct pointer usage
1071 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
1073 # Require designated initializers for all marked structures
1074 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
1076 # change __FILE__ to the relative path from the srctree
1077 KBUILD_CPPFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
1079 # include additional Makefiles when needed
1080 include-y
:= scripts
/Makefile.extrawarn
1081 include-
$(CONFIG_DEBUG_INFO
) += scripts
/Makefile.debug
1082 include-
$(CONFIG_KASAN
) += scripts
/Makefile.kasan
1083 include-
$(CONFIG_KCSAN
) += scripts
/Makefile.kcsan
1084 include-
$(CONFIG_KMSAN
) += scripts
/Makefile.kmsan
1085 include-
$(CONFIG_UBSAN
) += scripts
/Makefile.ubsan
1086 include-
$(CONFIG_KCOV
) += scripts
/Makefile.kcov
1087 include-
$(CONFIG_RANDSTRUCT
) += scripts
/Makefile.randstruct
1088 include-
$(CONFIG_GCC_PLUGINS
) += scripts
/Makefile.gcc-plugins
1090 include $(addprefix $(srctree
)/, $(include-y
))
1092 # scripts/Makefile.gcc-plugins is intentionally included last.
1093 # Do not add $(call cc-option,...) below this line. When you build the kernel
1094 # from the clean source tree, the GCC plugins do not exist at this point.
1096 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1097 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
1098 KBUILD_AFLAGS
+= $(KAFLAGS
)
1099 KBUILD_CFLAGS
+= $(KCFLAGS
)
1100 KBUILD_RUSTFLAGS
+= $(KRUSTFLAGS
)
1102 KBUILD_LDFLAGS_MODULE
+= --build-id
=sha1
1103 LDFLAGS_vmlinux
+= --build-id
=sha1
1105 KBUILD_LDFLAGS
+= -z noexecstack
1106 ifeq ($(CONFIG_LD_IS_BFD
),y
)
1107 KBUILD_LDFLAGS
+= $(call ld-option
,--no-warn-rwx-segments
)
1110 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
1111 LDFLAGS_vmlinux
+= -X
1114 ifeq ($(CONFIG_RELR
),y
)
1115 LDFLAGS_vmlinux
+= --pack-dyn-relocs
=relr
--use-android-relr-tags
1118 # We never want expected sections to be placed heuristically by the
1119 # linker. All sections should be explicitly named in the linker script.
1120 ifdef CONFIG_LD_ORPHAN_WARN
1121 LDFLAGS_vmlinux
+= --orphan-handling
=warn
1124 # Align the bit size of userspace programs with the kernel
1125 KBUILD_USERCFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1126 KBUILD_USERLDFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1128 # make the checker run with the right architecture
1129 CHECKFLAGS
+= --arch
=$(ARCH
)
1131 # insure the checker run with the right endianness
1132 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
1134 # the checker needs the correct machine size
1135 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
1137 # Default kernel image to build when no specific target is given.
1138 # KBUILD_IMAGE may be overruled on the command line or
1139 # set in the environment
1140 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1141 # this default value
1142 export KBUILD_IMAGE ?
= vmlinux
1145 # INSTALL_PATH specifies where to place the updated kernel and system map
1146 # images. Default is /boot, but you can set it to other values
1147 export INSTALL_PATH ?
= /boot
1150 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1151 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1152 # an argument if needed. Otherwise it defaults to the kernel install path
1154 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
1157 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1158 # relocations required by build roots. This is not defined in the
1159 # makefile but the argument can be passed to make if needed.
1162 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
1167 export extmod_prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
1168 export MODORDER
:= $(extmod_prefix
)modules.order
1169 export MODULES_NSDEPS
:= $(extmod_prefix
)modules.nsdeps
1171 ifeq ($(KBUILD_EXTMOD
),)
1174 clean-dirs
:= $(sort . Documentation \
1175 $(patsubst %/,%,$(filter %/, $(core-
) \
1176 $(drivers-
) $(libs-
))))
1178 export ARCH_CORE
:= $(core-y
)
1179 export ARCH_LIB
:= $(filter %/, $(libs-y
))
1180 export ARCH_DRIVERS
:= $(drivers-y
) $(drivers-m
)
1181 # Externally visible symbols (used by link-vmlinux.sh)
1183 KBUILD_VMLINUX_OBJS
:= .
/built-in.a
1184 ifdef CONFIG_MODULES
1185 KBUILD_VMLINUX_OBJS
+= $(patsubst %/, %/lib.a
, $(filter %/, $(libs-y
)))
1186 KBUILD_VMLINUX_LIBS
:= $(filter-out %/, $(libs-y
))
1188 KBUILD_VMLINUX_LIBS
:= $(patsubst %/,%/lib.a
, $(libs-y
))
1191 export KBUILD_VMLINUX_LIBS
1192 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1194 # Recurse until adjust_autoksyms.sh is satisfied
1195 PHONY
+= autoksyms_recursive
1196 ifdef CONFIG_TRIM_UNUSED_KSYMS
1197 # For the kernel to actually contain only the needed exported symbols,
1198 # we have to build modules as well to determine what those symbols are.
1199 # (this can be evaluated only once include/config/auto.conf has been included)
1202 autoksyms_recursive
: $(build-dir
) modules.order
1203 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1204 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1207 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1209 quiet_cmd_autoksyms_h
= GEN
$@
1210 cmd_autoksyms_h
= mkdir
-p
$(dir $@
); \
1211 $(CONFIG_SHELL
) $(srctree
)/scripts
/gen_autoksyms.sh
$@
1214 $(call cmd
,autoksyms_h
)
1216 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1217 quiet_cmd_ar_vmlinux.a
= AR
$@
1218 cmd_ar_vmlinux.a
= \
1220 $(AR
) cDPrST
$@
$(KBUILD_VMLINUX_OBJS
); \
1221 $(AR
) mPiT
$$($(AR
) t
$@ | head
-n1
) $@
$$($(AR
) t
$@ | grep
-F
--file
=$(srctree
)/scripts
/head-object-list.txt
)
1223 targets
+= vmlinux.a
1224 vmlinux.a
: $(KBUILD_VMLINUX_OBJS
) scripts
/head-object-list.txt autoksyms_recursive FORCE
1225 $(call if_changed
,ar_vmlinux.a
)
1228 vmlinux_o
: vmlinux.a
$(KBUILD_VMLINUX_LIBS
)
1229 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux_o
1231 vmlinux.o modules.builtin.modinfo modules.builtin
: vmlinux_o
1235 vmlinux
: vmlinux.o
$(KBUILD_LDS
) modpost
1236 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux
1238 # The actual objects are generated when descending,
1239 # make sure no implicit rule kicks in
1240 $(sort $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)): .
;
1242 filechk_kernel.release
= \
1243 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1245 # Store (new) KERNELRELEASE string in include/config/kernel.release
1246 include/config
/kernel.release
: FORCE
1247 $(call filechk
,kernel.release
)
1249 # Additional helpers built in scripts/
1250 # Carefully list dependencies so we do not try to build scripts twice
1253 scripts
: scripts_basic scripts_dtc
1254 $(Q
)$(MAKE
) $(build
)=$(@
)
1256 # Things we need to do before we recursively start building the kernel
1257 # or the modules are listed in "prepare".
1258 # A multi level approach is used. prepareN is processed before prepareN-1.
1259 # archprepare is used in arch Makefiles and when processed asm symlink,
1260 # version.h and scripts_basic is processed / created.
1262 PHONY
+= prepare archprepare
1264 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1265 asm-generic
$(version_h
) $(autoksyms_h
) include/generated
/utsrelease.h \
1266 include/generated
/compile.h
include/generated
/autoconf.h remove-stale-files
1268 prepare0
: archprepare
1269 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1270 $(Q
)$(MAKE
) $(build
)=. prepare
1272 # All the preparing..
1275 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
-v
1276 $(Q
)$(MAKE
) $(build
)=rust
1279 PHONY
+= remove-stale-files
1281 $(Q
)$(srctree
)/scripts
/remove-stale-files
1283 # Support for using generic headers in asm-generic
1284 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1286 PHONY
+= asm-generic uapi-asm-generic
1287 asm-generic
: uapi-asm-generic
1288 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1289 generic
=include/asm-generic
1291 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1292 generic
=include/uapi
/asm-generic
1294 # Generate some files
1295 # ---------------------------------------------------------------------------
1297 # KERNELRELEASE can change from a few different places, meaning version.h
1298 # needs to be updated, so this check is forced on all builds
1301 define filechk_utsrelease.h
1302 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1303 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1306 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1309 define filechk_version.h
1310 if
[ $(SUBLEVEL
) -gt
255 ]; then \
1311 echo \
#define LINUX_VERSION_CODE $(shell \
1312 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + 255); \
1314 echo \
#define LINUX_VERSION_CODE $(shell \
1315 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
1317 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1318 ((c) > 255 ? 255 : (c)))'; \
1319 echo \
#define LINUX_VERSION_MAJOR $(VERSION); \
1320 echo \
#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1321 echo \
#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1324 $(version_h
): PATCHLEVEL
:= $(or
$(PATCHLEVEL
), 0)
1325 $(version_h
): SUBLEVEL
:= $(or
$(SUBLEVEL
), 0)
1327 $(call filechk
,version.h
)
1329 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1330 $(call filechk
,utsrelease.h
)
1332 filechk_compile.h
= $(srctree
)/scripts
/mkcompile_h \
1333 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1335 include/generated
/compile.h
: FORCE
1336 $(call filechk
,compile.h
)
1340 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1341 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1343 # ---------------------------------------------------------------------------
1346 #Default location for installed headers
1347 export INSTALL_HDR_PATH
= $(objtree
)/usr
1349 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1350 cmd_headers_install
= \
1351 mkdir
-p
$(INSTALL_HDR_PATH
); \
1352 rsync
-mrl
--include='*/' --include='*\.h' --exclude
='*' \
1353 usr
/include $(INSTALL_HDR_PATH
)
1355 PHONY
+= headers_install
1356 headers_install
: headers
1357 $(call cmd
,headers_install
)
1359 PHONY
+= archheaders archscripts
1361 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1364 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1365 $(if
$(filter um
, $(SRCARCH
)), $(error Headers not exportable for UML
))
1366 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1367 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1369 ifdef CONFIG_HEADERS_INSTALL
1373 PHONY
+= scripts_unifdef
1374 scripts_unifdef
: scripts_basic
1375 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1377 # ---------------------------------------------------------------------------
1380 # Many distributions have the custom install script, /sbin/installkernel.
1381 # If DKMS is installed, 'make install' will eventually recurse back
1382 # to this Makefile to build and install external modules.
1383 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1385 quiet_cmd_install
= INSTALL
$(INSTALL_PATH
)
1386 cmd_install
= unset sub_make_done
; $(srctree
)/scripts
/install.sh
1388 # ---------------------------------------------------------------------------
1391 ifdef CONFIG_OBJTOOL
1392 prepare
: tools
/objtool
1396 ifdef CONFIG_DEBUG_INFO_BTF
1397 prepare
: tools
/bpf
/resolve_btfids
1401 PHONY
+= resolve_btfids_clean
1403 resolve_btfids_O
= $(abspath
$(objtree
))/tools
/bpf
/resolve_btfids
1405 # tools/bpf/resolve_btfids directory might not exist
1406 # in output directory, skip its clean in that case
1407 resolve_btfids_clean
:
1408 ifneq ($(wildcard $(resolve_btfids_O
)),)
1409 $(Q
)$(MAKE
) -sC
$(srctree
)/tools
/bpf
/resolve_btfids O
=$(resolve_btfids_O
) clean
1412 # Clear a bunch of variables before executing the submake
1413 ifeq ($(quiet
),silent_
)
1418 $(Q
)mkdir
-p
$(objtree
)/tools
1419 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1422 $(Q
)mkdir
-p
$(objtree
)/tools
1423 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1425 # ---------------------------------------------------------------------------
1430 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1432 kselftest-
%: headers FORCE
1433 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1435 PHONY
+= kselftest-merge
1437 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1438 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config | \
1439 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-m
$(objtree
)/.config
1440 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1442 # ---------------------------------------------------------------------------
1445 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1446 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1452 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1454 %.dtbo
: dtbs_prepare
1455 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1457 PHONY
+= dtbs dtbs_prepare dtbs_install dtbs_check
1459 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1461 # include/config/kernel.release is actually needed when installing DTBs because
1462 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1463 # dtbs_install depend on it as dtbs_install may run as root.
1464 dtbs_prepare
: include/config
/kernel.release scripts_dtc
1466 ifneq ($(filter dtbs_check
, $(MAKECMDGOALS
)),)
1468 dtbs
: dt_binding_check
1474 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
) dst
=$(INSTALL_DTBS_PATH
)
1476 ifdef CONFIG_OF_EARLY_FLATTREE
1482 PHONY
+= scripts_dtc
1483 scripts_dtc
: scripts_basic
1484 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1486 ifneq ($(filter dt_binding_check
, $(MAKECMDGOALS
)),)
1487 export CHECK_DT_BINDING
=y
1490 PHONY
+= dt_binding_check
1491 dt_binding_check
: scripts_dtc
1492 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1494 PHONY
+= dt_compatible_check
1495 dt_compatible_check
: dt_binding_check
1496 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
$@
1498 # ---------------------------------------------------------------------------
1501 ifdef CONFIG_MODULES
1503 # By default, build modules as well
1507 # When we're building modules with modversions, we need to consider
1508 # the built-in objects during the descend as well, in order to
1509 # make sure the checksums are up to date before we record them.
1510 ifdef CONFIG_MODVERSIONS
1517 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES
1519 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1523 modules
: modules_prepare
1525 # Target to prepare building external modules
1526 modules_prepare
: prepare
1527 $(Q
)$(MAKE
) $(build
)=scripts scripts
/module.lds
1529 export modules_sign_only
:=
1531 ifeq ($(CONFIG_MODULE_SIG
),y
)
1532 PHONY
+= modules_sign
1533 modules_sign
: modules_install
1536 # modules_sign is a subset of modules_install.
1537 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1538 ifeq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1539 modules_sign_only
:= y
1544 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1545 modinst_pre
:= __modinst_pre
1548 modules_install
: $(modinst_pre
)
1549 PHONY
+= __modinst_pre
1551 @
rm -rf
$(MODLIB
)/kernel
1552 @
rm -f
$(MODLIB
)/source
1553 @mkdir
-p
$(MODLIB
)/kernel
1554 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1555 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1556 rm -f
$(MODLIB
)/build
; \
1557 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1559 @sed
's:^:kernel/:' modules.order
> $(MODLIB
)/modules.order
1560 @cp
-f modules.builtin
$(MODLIB
)/
1561 @cp
-f
$(objtree
)/modules.builtin.modinfo
$(MODLIB
)/
1563 endif # CONFIG_MODULES
1566 # Cleaning is done on three levels.
1567 # make clean Delete most generated files
1568 # Leave enough to build external modules
1569 # make mrproper Delete the current configuration, and all generated files
1570 # make distclean Remove editor backup files, patch leftover files and the like
1572 # Directories & files removed with 'make clean'
1573 CLEAN_FILES
+= include/ksym vmlinux.symvers modules-only.symvers \
1574 modules.builtin modules.builtin.modinfo modules.nsdeps \
1575 compile_commands.json .thinlto-cache rust
/test rust
/doc \
1576 .vmlinux.objs .vmlinux.
export.c
1578 # Directories & files removed with 'make mrproper'
1579 MRPROPER_FILES
+= include/config
include/generated \
1580 arch
/$(SRCARCH
)/include/generated .objdiff \
1581 debian snap tar-install \
1582 .config .config.old .version \
1584 certs
/signing_key.pem \
1588 rust
/target.json rust
/libmacros.so
1590 # clean - Delete most, but leave enough to build external modules
1592 clean: rm-files
:= $(CLEAN_FILES
)
1594 PHONY
+= archclean vmlinuxclean
1597 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1598 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1600 clean: archclean vmlinuxclean resolve_btfids_clean
1602 # mrproper - Delete all generated files, including .config
1604 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1605 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1607 PHONY
+= $(mrproper-dirs
) mrproper
1609 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1611 mrproper
: clean $(mrproper-dirs
)
1613 @find .
$(RCS_FIND_IGNORE
) \
1614 \
( -name
'*.rmeta' \
) \
1615 -type f
-print | xargs
rm -f
1622 @find .
$(RCS_FIND_IGNORE
) \
1623 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1624 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1625 -o
-name
'core' -o
-name
tags -o
-name TAGS
-o
-name
'cscope*' \
1626 -o
-name GPATH
-o
-name GRTAGS
-o
-name GSYMS
-o
-name GTAGS \
) \
1627 -type f
-print | xargs
rm -f
1630 # Packaging of the kernel to various formats
1631 # ---------------------------------------------------------------------------
1634 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1635 %pkg
: include/config
/kernel.release FORCE
1636 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1638 # Brief documentation of the typical targets used
1639 # ---------------------------------------------------------------------------
1641 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1642 boards
:= $(sort $(notdir $(boards
)))
1643 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1644 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1648 @echo
'Cleaning targets:'
1649 @echo
' clean - Remove most generated files but keep the config and'
1650 @echo
' enough build support to build external modules'
1651 @echo
' mrproper - Remove all generated files + config + various backup files'
1652 @echo
' distclean - mrproper + remove editor backup and patch files'
1654 @echo
'Configuration targets:'
1655 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1657 @echo
'Other generic targets:'
1658 @echo
' all - Build all targets marked with [*]'
1659 @echo
'* vmlinux - Build the bare kernel'
1660 @echo
'* modules - Build all modules'
1661 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1662 @echo
' dir/ - Build all files in dir and below'
1663 @echo
' dir/file.[ois] - Build specified target only'
1664 @echo
' dir/file.ll - Build the LLVM assembly file'
1665 @echo
' (requires compiler support for LLVM assembly generation)'
1666 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1667 @echo
' (requires a recent binutils and recent build (System.map))'
1668 @echo
' dir/file.ko - Build module including final link'
1669 @echo
' modules_prepare - Set up for building external modules'
1670 @echo
' tags/TAGS - Generate tags file for editors'
1671 @echo
' cscope - Generate cscope index'
1672 @echo
' gtags - Generate GNU GLOBAL index'
1673 @echo
' kernelrelease - Output the release version string (use with make -s)'
1674 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1675 @echo
' image_name - Output the image name (use with make -s)'
1676 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1677 echo
' (default: $(INSTALL_HDR_PATH))'; \
1679 @echo
'Static analysers:'
1680 @echo
' checkstack - Generate a list of stack hogs'
1681 @echo
' versioncheck - Sanity check on version.h usage'
1682 @echo
' includecheck - Check for duplicate included header files'
1683 @echo
' export_report - List the usages of all exported symbols'
1684 @echo
' headerdep - Detect inclusion cycles in headers'
1685 @echo
' coccicheck - Check with Coccinelle'
1686 @echo
' clang-analyzer - Check with clang static analyzer'
1687 @echo
' clang-tidy - Check with clang-tidy'
1690 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1692 @echo
'Kernel selftest:'
1693 @echo
' kselftest - Build and run kernel selftest'
1694 @echo
' Build, install, and boot kernel before'
1695 @echo
' running kselftest on it'
1696 @echo
' Run as root for full coverage'
1697 @echo
' kselftest-all - Build kernel selftest'
1698 @echo
' kselftest-install - Build and install kernel selftest'
1699 @echo
' kselftest-clean - Remove all generated kselftest files'
1700 @echo
' kselftest-merge - Merge all the config dependencies of'
1701 @echo
' kselftest to existing .config.'
1703 @echo
'Rust targets:'
1704 @echo
' rustavailable - Checks whether the Rust toolchain is'
1705 @echo
' available and, if not, explains why.'
1706 @echo
' rustfmt - Reformat all the Rust code in the kernel'
1707 @echo
' rustfmtcheck - Checks if all the Rust code in the kernel'
1708 @echo
' is formatted, printing a diff otherwise.'
1709 @echo
' rustdoc - Generate Rust documentation'
1710 @echo
' (requires kernel .config)'
1711 @echo
' rusttest - Runs the Rust tests'
1712 @echo
' (requires kernel .config; downloads external repos)'
1713 @echo
' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1714 @echo
' (requires kernel .config)'
1715 @echo
' dir/file.[os] - Build specified target only'
1716 @echo
' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1717 @echo
' Run with RUSTFMT=n to skip reformatting if needed.'
1718 @echo
' The output is not intended to be compilable.'
1719 @echo
' dir/file.ll - Build the LLVM assembly file'
1722 echo
'Devicetree:'; \
1723 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1724 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1725 echo
' dt_binding_check - Validate device tree binding documents'; \
1726 echo
' dtbs_check - Validate device tree source files';\
1729 @echo
'Userspace tools targets:'
1730 @echo
' use "make tools/help"'
1731 @echo
' or "cd tools; make help"'
1733 @echo
'Kernel packaging:'
1734 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1736 @echo
'Documentation targets:'
1737 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1739 @echo
'Architecture specific targets ($(SRCARCH)):'
1741 echo
' No architecture specific help defined for $(SRCARCH)')
1744 $(foreach b
, $(boards
), \
1745 printf
" %-27s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1747 @
$(if
$(board-dirs
), \
1748 $(foreach b
, $(board-dirs
), \
1749 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1750 printf
" %-16s - Show all of the above\\n" help-boards
; \
1753 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1754 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1755 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1756 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK'
1757 @echo
' (sparse by default)'
1758 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1759 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1760 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1761 @echo
' 1: warnings which may be relevant and do not occur too often'
1762 @echo
' 2: warnings which occur quite often but may still be relevant'
1763 @echo
' 3: more obscure warnings, can most likely be ignored'
1764 @echo
' e: warnings are being treated as errors'
1765 @echo
' Multiple levels can be combined with W=12 or W=123'
1767 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1768 @echo
'For further info see the ./README file'
1771 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1773 help-boards
: $(help-board-dirs
)
1775 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1777 $(help-board-dirs
): help-
%:
1778 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1779 @
$(if
$(boards-per-dir
), \
1780 $(foreach b
, $(boards-per-dir
), \
1781 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1785 # Documentation targets
1786 # ---------------------------------------------------------------------------
1787 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1788 linkcheckdocs dochelp refcheckdocs
1789 PHONY
+= $(DOC_TARGETS
)
1791 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1795 # ---------------------------------------------------------------------------
1797 # "Is Rust available?" target
1798 PHONY
+= rustavailable
1800 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
-v
&& echo
"Rust is available!"
1802 # Documentation target
1804 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1807 $(Q
)$(MAKE
) $(build
)=rust
$@
1812 $(Q
)$(MAKE
) $(build
)=rust
$@
1814 # Formatting targets
1815 PHONY
+= rustfmt rustfmtcheck
1817 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1819 # We match using absolute paths since `find` does not resolve them
1820 # when matching, which is a problem when e.g. `srctree` is `..`.
1821 # We `grep` afterwards in order to remove the directory entry itself.
1823 $(Q
)find
$(abs_srctree
) -type f
-name
'*.rs' \
1824 -o
-path
$(abs_srctree
)/rust
/alloc
-prune \
1825 -o
-path
$(abs_objtree
)/rust
/test -prune \
1826 | grep
-Fv
$(abs_srctree
)/rust
/alloc \
1827 | grep
-Fv
$(abs_objtree
)/rust
/test \
1828 | grep
-Fv generated \
1829 | xargs
$(RUSTFMT
) $(rustfmt_flags
)
1831 rustfmtcheck
: rustfmt_flags
= --check
1832 rustfmtcheck
: rustfmt
1834 # IDE support targets
1835 PHONY
+= rust-analyzer
1837 $(Q
)$(MAKE
) $(build
)=rust
$@
1840 # ---------------------------------------------------------------------------
1842 PHONY
+= scripts_gdb
1843 scripts_gdb
: prepare0
1844 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1845 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1847 ifdef CONFIG_GDB_SCRIPTS
1851 else # KBUILD_EXTMOD
1854 # External module support.
1855 # When building external modules the kernel used as basis is considered
1856 # read-only, and no consistency checks are made and the make
1857 # system is not used on the basis kernel. If updates are required
1858 # in the basis kernel ordinary make commands (without M=...) must be used.
1860 # We are always building only modules.
1864 build-dir
:= $(KBUILD_EXTMOD
)
1866 compile_commands.json
: $(extmod_prefix
)compile_commands.json
1867 PHONY
+= compile_commands.json
1869 clean-dirs
:= $(KBUILD_EXTMOD
)
1870 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
$(KBUILD_EXTMOD
)/modules.nsdeps \
1871 $(KBUILD_EXTMOD
)/compile_commands.json
$(KBUILD_EXTMOD
)/.thinlto-cache
1874 # now expand this into a simple variable to reduce the cost of shell evaluations
1875 prepare
: CC_VERSION_TEXT
:= $(CC_VERSION_TEXT
)
1877 @if
[ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1878 echo
>&2 "warning: the compiler differs from the one used to build the kernel"; \
1879 echo
>&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1880 echo
>&2 " You are using: $(CC_VERSION_TEXT)"; \
1885 @echo
' Building external modules.'
1886 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1888 @echo
' modules - default target, build the module(s)'
1889 @echo
' modules_install - install the module'
1890 @echo
' clean - remove generated files in module directory only'
1893 endif # KBUILD_EXTMOD
1895 # ---------------------------------------------------------------------------
1898 PHONY
+= modules modules_install modules_prepare
1900 ifdef CONFIG_MODULES
1902 $(MODORDER
): $(build-dir
)
1905 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1906 # This is solely useful to speed up test compiles.
1908 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
1909 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
1912 PHONY
+= modules_check
1913 modules_check
: $(MODORDER
)
1914 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
$<
1916 quiet_cmd_depmod
= DEPMOD
$(MODLIB
)
1917 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1921 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1924 else # CONFIG_MODULES
1926 # Modules not configured
1927 # ---------------------------------------------------------------------------
1929 modules modules_install
:
1931 @echo
>&2 '*** The present kernel configuration has modules disabled.'
1932 @echo
>&2 '*** To use the module feature, please run "make menuconfig" etc.'
1933 @echo
>&2 '*** to enable CONFIG_MODULES.'
1939 endif # CONFIG_MODULES
1942 modpost
: $(if
$(single-build
),, $(if
$(KBUILD_BUILTIN
), vmlinux.o
)) \
1943 $(if
$(KBUILD_MODULES
), modules_check
)
1944 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1947 # ---------------------------------------------------------------------------
1948 # To build individual files in subdirectories, you can do like this:
1950 # make foo/bar/baz.s
1952 # The supported suffixes for single-target are listed in 'single-targets'
1954 # To build only under specific subdirectories, you can do like this:
1960 # .ko is special because modpost is needed
1961 single-ko
:= $(sort $(filter %.ko
, $(MAKECMDGOALS
)))
1962 single-no-ko
:= $(filter-out $(single-ko
), $(MAKECMDGOALS
)) \
1963 $(foreach x
, o mod
, $(patsubst %.ko
, %.
$x, $(single-ko
)))
1965 $(single-ko
): single_modules
1967 $(single-no-ko
): $(build-dir
)
1970 # Remove MODORDER when done because it is not the real one.
1971 PHONY
+= single_modules
1972 single_modules
: $(single-no-ko
) modules_prepare
1973 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod_prefix
)$m;) } > $(MODORDER
)
1974 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1975 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
1976 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
1978 $(Q
)rm -f
$(MODORDER
)
1980 single-goals
:= $(addprefix $(build-dir
)/, $(single-no-ko
))
1984 # Preset locale variables to speed up the build process. Limit locale
1985 # tweaks to this spot to avoid wrong language settings when running
1986 # make menuconfig etc.
1987 # Error messages still appears in the original language
1988 PHONY
+= $(build-dir
)
1989 $(build-dir
): prepare
1990 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1 need-modorder
=1 $(single-goals
)
1992 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
1993 PHONY
+= $(clean-dirs
) clean
1995 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1997 clean: $(clean-dirs
)
1999 @find
$(or
$(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
2000 \
( -name
'*.[aios]' -o
-name
'*.rsi' -o
-name
'*.ko' -o
-name
'.*.cmd' \
2002 -o
-name
'*.dtb' -o
-name
'*.dtbo' -o
-name
'*.dtb.S' -o
-name
'*.dt.yaml' \
2003 -o
-name
'*.dwo' -o
-name
'*.lst' \
2004 -o
-name
'*.su' -o
-name
'*.mod' -o
-name
'*.usyms' \
2005 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
2006 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
2007 -o
-name
'*.asn1.[ch]' \
2008 -o
-name
'*.symtypes' -o
-name
'modules.order' \
2010 -o
-name
'*.c.[012]*.*' \
2013 -o
-name
'*.*.symversions' \
) -type f
-print | xargs
rm -f
2015 # Generate tags for editors
2016 # ---------------------------------------------------------------------------
2017 quiet_cmd_tags
= GEN
$@
2018 cmd_tags
= $(BASH
) $(srctree
)/scripts
/tags.sh
$@
2020 tags TAGS cscope gtags
: FORCE
2023 # Script to generate missing namespace dependencies
2024 # ---------------------------------------------------------------------------
2027 nsdeps
: export KBUILD_NSDEPS
=1
2029 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/nsdeps
2032 # ---------------------------------------------------------------------------
2034 quiet_cmd_gen_compile_commands
= GEN
$@
2035 cmd_gen_compile_commands
= $(PYTHON3
) $< -a
$(AR
) -o
$@
$(filter-out $<, $(real-prereqs
))
2037 $(extmod_prefix
)compile_commands.json
: scripts
/clang-tools
/gen_compile_commands.py \
2038 $(if
$(KBUILD_EXTMOD
),, vmlinux.a
$(KBUILD_VMLINUX_LIBS
)) \
2039 $(if
$(CONFIG_MODULES
), $(MODORDER
)) FORCE
2040 $(call if_changed
,gen_compile_commands
)
2042 targets
+= $(extmod_prefix
)compile_commands.json
2044 PHONY
+= clang-tidy clang-analyzer
2046 ifdef CONFIG_CC_IS_CLANG
2047 quiet_cmd_clang_tools
= CHECK
$<
2048 cmd_clang_tools
= $(PYTHON3
) $(srctree
)/scripts
/clang-tools
/run-clang-tools.py
$@
$<
2050 clang-tidy clang-analyzer
: $(extmod_prefix
)compile_commands.json
2051 $(call cmd
,clang_tools
)
2053 clang-tidy clang-analyzer
:
2054 @echo
"$@ requires CC=clang" >&2
2058 # Scripts to check various things for consistency
2059 # ---------------------------------------------------------------------------
2061 PHONY
+= includecheck versioncheck coccicheck export_report
2064 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
2065 -name
'*.[hcS]' -type f
-print |
sort \
2066 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
2069 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
2070 -name
'*.[hcS]' -type f
-print |
sort \
2071 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
2074 $(Q
)$(BASH
) $(srctree
)/scripts
/$@
2077 $(PERL
) $(srctree
)/scripts
/export_report.pl
2079 PHONY
+= checkstack kernelrelease kernelversion image_name
2081 # UML needs a little special treatment here. It wants to use the host
2082 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2083 # else wants $(ARCH), including people doing cross-builds, which means
2084 # that $(SUBARCH) doesn't work here.
2086 CHECKSTACK_ARCH
:= $(SUBARCH
)
2088 CHECKSTACK_ARCH
:= $(ARCH
)
2091 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
2092 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
2095 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
2098 @echo
$(KERNELVERSION
)
2101 @echo
$(KBUILD_IMAGE
)
2103 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
2104 cmd_rmfiles
= rm -rf
$(rm-files
)
2106 # read saved command lines for existing targets
2107 existing-targets
:= $(wildcard $(sort $(targets
)))
2109 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
2111 endif # config-build
2113 endif # need-sub-make
2118 # Declare the contents of the PHONY variable as phony. We keep that
2119 # information in a variable so we can use it in if_changed and friends.