1 # SPDX-License-Identifier: GPL-2.0
6 NAME
= Hurr durr I
'ma ninja sloth
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 ifeq ($(filter undefine,$(.FEATURES)),)
15 $(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION))
18 $(if $(filter __%, $(MAKECMDGOALS)), \
19 $(error targets prefixed with '__
' are only for internal use))
21 # That's our default target when none is given on the command line
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.a targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 this-makefile
:= $(lastword
$(MAKEFILE_LIST
))
42 export abs_srctree
:= $(realpath
$(dir $(this-makefile
)))
43 export abs_objtree
:= $(CURDIR
)
45 ifneq ($(sub_make_done
),1)
47 # Do not use make's built-in rules and variables
48 # (this increases performance and avoids hard-to-debug behaviour)
51 # Avoid funny character set dependencies
55 export LC_COLLATE LC_NUMERIC
57 # Avoid interference with shell env settings
61 # ---------------------------------------------------------------------------
63 # Most of build commands in Kbuild start with "cmd_". You can optionally define
64 # "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
65 # that command is printed by default.
68 # quiet_cmd_depmod = DEPMOD $(MODLIB)
69 # cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
71 # A simple variant is to prefix commands with $(Q) - that's useful
72 # for commands that shall be hidden in non-verbose mode.
74 # $(Q)$(MAKE) $(build)=scripts/basic
76 # If KBUILD_VERBOSE contains 1, the whole command is echoed.
77 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
79 # To put more focus on warnings, be less verbose as default
80 # Use 'make V=1' to see the full commands
82 ifeq ("$(origin V)", "command line")
89 ifneq ($(findstring 1, $(KBUILD_VERBOSE
)),)
94 # If the user is running make -s (silent mode), suppress echoing of
96 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
98 ifeq ($(filter 3.
%,$(MAKE_VERSION
)),)
99 short-opts
:= $(firstword -$(MAKEFLAGS
))
101 short-opts
:= $(filter-out --%,$(MAKEFLAGS
))
104 ifneq ($(findstring s
,$(short-opts
)),)
106 override KBUILD_VERBOSE
:=
109 export quiet Q KBUILD_VERBOSE
111 # Call a source code checker (by default, "sparse") as part of the
114 # Use 'make C=1' to enable checking of only re-compiled files.
115 # Use 'make C=2' to enable checking of *all* source files, regardless
116 # of whether they are re-compiled or not.
118 # See the file "Documentation/dev-tools/sparse.rst" for more details,
119 # including where to get the "sparse" utility.
121 ifeq ("$(origin C)", "command line")
122 KBUILD_CHECKSRC
= $(C
)
124 ifndef KBUILD_CHECKSRC
128 export KBUILD_CHECKSRC
130 # Enable "clippy" (a linter) as part of the Rust compilation.
132 # Use 'make CLIPPY=1' to enable it.
133 ifeq ("$(origin CLIPPY)", "command line")
134 KBUILD_CLIPPY
:= $(CLIPPY
)
139 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
140 # directory of external module to build. Setting M= takes precedence.
141 ifeq ("$(origin M)", "command line")
142 KBUILD_EXTMOD
:= $(M
)
145 $(if
$(word 2, $(KBUILD_EXTMOD
)), \
146 $(error building multiple external modules is not supported
))
148 $(foreach x
, % :, $(if
$(findstring $x, $(KBUILD_EXTMOD
)), \
149 $(error module directory path cannot contain
'$x')))
151 # Remove trailing slashes
152 ifneq ($(filter %/, $(KBUILD_EXTMOD
)),)
153 KBUILD_EXTMOD
:= $(shell dirname
$(KBUILD_EXTMOD
).
)
158 # backward compatibility
159 KBUILD_EXTRA_WARN ?
= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS
)
161 ifeq ("$(origin W)", "command line")
162 KBUILD_EXTRA_WARN
:= $(W
)
165 export KBUILD_EXTRA_WARN
167 # Kbuild will save output files in the current working directory.
168 # This does not need to match to the root of the kernel source tree.
170 # For example, you can do this:
172 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
174 # If you want to save output files in a different location, there are
175 # two syntaxes to specify it.
178 # Use "make O=dir/to/store/output/files/"
180 # 2) Set KBUILD_OUTPUT
181 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
182 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
184 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
187 # Do we want to change the working directory?
188 ifeq ("$(origin O)", "command line")
189 KBUILD_OUTPUT
:= $(O
)
192 ifneq ($(KBUILD_OUTPUT
),)
193 # $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first.
194 $(shell mkdir
-p
"$(KBUILD_OUTPUT)")
195 # $(realpath ...) resolves symlinks
196 abs_objtree
:= $(realpath
$(KBUILD_OUTPUT
))
197 $(if
$(abs_objtree
),,$(error failed to create output directory
"$(KBUILD_OUTPUT)"))
198 endif # ifneq ($(KBUILD_OUTPUT),)
200 ifneq ($(words $(subst :, ,$(abs_srctree
))), 1)
201 $(error source directory cannot contain spaces or colons
)
204 ifneq ($(filter 3.
%,$(MAKE_VERSION
)),)
205 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
206 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
208 # Cancel implicit rules for this Makefile.
212 export sub_make_done
:= 1
214 endif # sub_make_done
216 ifeq ($(abs_objtree
),$(CURDIR
))
217 # Suppress "Entering directory ..." if we are at the final work directory.
218 no-print-directory
:= --no-print-directory
220 # Recursion to show "Entering directory ..."
224 ifeq ($(filter --no-print-directory
, $(MAKEFLAGS
)),)
225 # If --no-print-directory is unset, recurse once again to set it.
226 # You may end up recursing into __sub-make twice. This is needed due to the
227 # behavior change in GNU Make 4.4.1.
231 ifeq ($(need-sub-make
),1)
233 PHONY
+= $(MAKECMDGOALS
) __sub-make
235 $(filter-out $(this-makefile
), $(MAKECMDGOALS
)) __all
: __sub-make
238 # Invoke a second make in the output directory, passing relevant variables
240 $(Q
)$(MAKE
) $(no-print-directory
) -C
$(abs_objtree
) \
241 -f
$(abs_srctree
)/Makefile
$(MAKECMDGOALS
)
245 # We process the rest of the Makefile if this is the final invocation of make
247 ifeq ($(abs_srctree
),$(abs_objtree
))
248 # building in the source tree
250 building_out_of_srctree
:=
252 ifeq ($(abs_srctree
)/,$(dir $(abs_objtree
)))
253 # building in a subdirectory of the source tree
256 srctree
:= $(abs_srctree
)
258 building_out_of_srctree
:= 1
261 ifneq ($(KBUILD_ABS_SRCTREE
),)
262 srctree
:= $(abs_srctree
)
268 export building_out_of_srctree srctree objtree VPATH
270 # To make sure we do not include .config for any of the *config targets
271 # catch them early, and hand them over to scripts/kconfig/Makefile
272 # It is allowed to specify more targets when calling make, including
273 # mixing *config targets and build targets.
274 # For example 'make oldconfig all'.
275 # Detect when mixed targets is specified, and make a second invocation
276 # of make so .config is not included in this case either (for *config).
278 version_h
:= include/generated
/uapi
/linux
/version.h
280 clean-targets
:= %clean mrproper cleandocs
281 no-dot-config-targets
:= $(clean-targets
) \
282 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
283 $(version_h
) headers headers_
% archheaders archscripts \
284 %asm-generic kernelversion
%src-pkg dt_binding_check \
285 outputmakefile rustavailable rustfmt rustfmtcheck
286 no-sync-config-targets
:= $(no-dot-config-targets
) %install modules_sign kernelrelease \
288 single-targets
:= %.a
%.i
%.ko
%.lds
%.ll
%.lst
%.mod
%.o
%.rsi
%.s
%.symtypes
%/
296 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
297 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
302 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
303 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
308 need-compiler
:= $(may-sync-config
)
310 ifneq ($(KBUILD_EXTMOD
),)
314 ifeq ($(KBUILD_EXTMOD
),)
315 ifneq ($(filter %config
,$(MAKECMDGOALS
)),)
317 ifneq ($(words $(MAKECMDGOALS
)),1)
323 # We cannot build single targets and the others at the same time
324 ifneq ($(filter $(single-targets
), $(MAKECMDGOALS
)),)
326 ifneq ($(filter-out $(single-targets
), $(MAKECMDGOALS
)),)
331 # For "make -j clean all", "make -j mrproper defconfig all", etc.
332 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
333 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
338 # install and modules_install need also be processed one by one
339 ifneq ($(filter install,$(MAKECMDGOALS
)),)
340 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
346 # ===========================================================================
347 # We're called with mixed targets (*config and build targets).
348 # Handle them one by one.
350 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
352 $(MAKECMDGOALS
): __build_one_by_one
357 for i in
$(MAKECMDGOALS
); do \
358 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
363 include $(srctree
)/scripts
/Kbuild.
include
365 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
366 KERNELRELEASE
= $(call read-file
, include/config
/kernel.release
)
367 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
368 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
370 include $(srctree
)/scripts
/subarch.
include
372 # Cross compiling and selecting different set of gcc/bin-utils
373 # ---------------------------------------------------------------------------
375 # When performing cross compilation for other architectures ARCH shall be set
376 # to the target architecture. (See arch/* for the possibilities).
377 # ARCH can be set during invocation of make:
379 # Another way is to have ARCH set in the environment.
380 # The default ARCH is the host where make is executed.
382 # CROSS_COMPILE specify the prefix used for all executables used
383 # during compilation. Only gcc and related bin-utils executables
384 # are prefixed with $(CROSS_COMPILE).
385 # CROSS_COMPILE can be set on the command line
386 # make CROSS_COMPILE=aarch64-linux-gnu-
387 # Alternatively CROSS_COMPILE can be set in the environment.
388 # Default value for CROSS_COMPILE is not to prefix executables
389 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
392 # Architecture as present in compile.h
393 UTS_MACHINE
:= $(ARCH
)
396 # Additional ARCH settings for x86
400 ifeq ($(ARCH
),x86_64
)
404 # Additional ARCH settings for sparc
405 ifeq ($(ARCH
),sparc32
)
408 ifeq ($(ARCH
),sparc64
)
412 # Additional ARCH settings for parisc
413 ifeq ($(ARCH
),parisc64
)
417 export cross_compiling
:=
418 ifneq ($(SRCARCH
),$(SUBARCH
))
422 KCONFIG_CONFIG ?
= .config
423 export KCONFIG_CONFIG
425 # SHELL used by kbuild
428 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
429 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
430 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
433 ifneq ($(filter %/,$(LLVM
)),)
434 LLVM_PREFIX
:= $(LLVM
)
435 else ifneq ($(filter -%,$(LLVM
)),)
436 LLVM_SUFFIX
:= $(LLVM
)
439 HOSTCC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
440 HOSTCXX
= $(LLVM_PREFIX
)clang
++$(LLVM_SUFFIX
)
446 HOSTPKG_CONFIG
= pkg-config
448 KBUILD_USERHOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes \
449 -O2
-fomit-frame-pointer
-std
=gnu11
450 KBUILD_USERCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(USERCFLAGS
)
451 KBUILD_USERLDFLAGS
:= $(USERLDFLAGS
)
453 # These flags apply to all Rust code in the tree, including the kernel and
455 export rust_common_flags
:= --edition
=2021 \
456 -Zbinary_dep_depinfo
=y \
457 -Dunsafe_op_in_unsafe_fn
-Drust_2018_idioms \
458 -Dunreachable_pub
-Dnon_ascii_idents \
460 -Drustdoc
::missing_crate_level_docs \
461 -Dclippy
::correctness
-Dclippy
::style \
462 -Dclippy
::suspicious
-Dclippy
::complexity \
464 -Dclippy
::let_unit_value
-Dclippy
::mut_mut \
465 -Dclippy
::needless_bitwise_bool \
466 -Dclippy
::needless_continue \
467 -Dclippy
::no_mangle_with_rust_abi \
470 KBUILD_HOSTCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(HOST_LFS_CFLAGS
) $(HOSTCFLAGS
)
471 KBUILD_HOSTCXXFLAGS
:= -Wall
-O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
472 KBUILD_HOSTRUSTFLAGS
:= $(rust_common_flags
) -O
-Cstrip
=debuginfo \
473 -Zallow-features
= $(HOSTRUSTFLAGS
)
474 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
475 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
477 # Make variables (CC, etc...)
480 CC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
481 LD
= $(LLVM_PREFIX
)ld.lld
$(LLVM_SUFFIX
)
482 AR
= $(LLVM_PREFIX
)llvm-ar
$(LLVM_SUFFIX
)
483 NM
= $(LLVM_PREFIX
)llvm-nm
$(LLVM_SUFFIX
)
484 OBJCOPY
= $(LLVM_PREFIX
)llvm-objcopy
$(LLVM_SUFFIX
)
485 OBJDUMP
= $(LLVM_PREFIX
)llvm-objdump
$(LLVM_SUFFIX
)
486 READELF
= $(LLVM_PREFIX
)llvm-readelf
$(LLVM_SUFFIX
)
487 STRIP
= $(LLVM_PREFIX
)llvm-strip
$(LLVM_SUFFIX
)
489 CC
= $(CROSS_COMPILE
)gcc
490 LD
= $(CROSS_COMPILE
)ld
491 AR
= $(CROSS_COMPILE
)ar
492 NM
= $(CROSS_COMPILE
)nm
493 OBJCOPY
= $(CROSS_COMPILE
)objcopy
494 OBJDUMP
= $(CROSS_COMPILE
)objdump
495 READELF
= $(CROSS_COMPILE
)readelf
496 STRIP
= $(CROSS_COMPILE
)strip
501 CLIPPY_DRIVER
= clippy-driver
505 RESOLVE_BTFIDS
= $(objtree
)/tools
/bpf
/resolve_btfids
/resolve_btfids
509 INSTALLKERNEL
:= installkernel
522 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
523 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
534 # Use USERINCLUDE when you must reference the UAPI directories only.
536 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
537 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
538 -I
$(srctree
)/include/uapi \
539 -I
$(objtree
)/include/generated
/uapi \
540 -include $(srctree
)/include/linux
/compiler-version.h \
541 -include $(srctree
)/include/linux
/kconfig.h
543 # Use LINUXINCLUDE when you must reference the include/ directory.
544 # Needed to be compatible with the O= option
546 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
547 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
548 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
549 -I
$(objtree
)/include \
552 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
555 KBUILD_CFLAGS
+= -std
=gnu11
556 KBUILD_CFLAGS
+= -fshort-wchar
557 KBUILD_CFLAGS
+= -funsigned-char
558 KBUILD_CFLAGS
+= -fno-common
559 KBUILD_CFLAGS
+= -fno-PIE
560 KBUILD_CFLAGS
+= -fno-strict-aliasing
562 KBUILD_CPPFLAGS
:= -D__KERNEL__
563 KBUILD_RUSTFLAGS
:= $(rust_common_flags
) \
564 --target
=$(objtree
)/scripts
/target.json \
565 -Cpanic
=abort
-Cembed-bitcode
=n
-Clto
=n \
566 -Cforce-unwind-tables
=n
-Ccodegen-units
=1 \
567 -Csymbol-mangling-version
=v0 \
568 -Crelocation-model
=static \
569 -Zfunction-sections
=n \
570 -Dclippy
::float_arithmetic
572 KBUILD_AFLAGS_KERNEL
:=
573 KBUILD_CFLAGS_KERNEL
:=
574 KBUILD_RUSTFLAGS_KERNEL
:=
575 KBUILD_AFLAGS_MODULE
:= -DMODULE
576 KBUILD_CFLAGS_MODULE
:= -DMODULE
577 KBUILD_RUSTFLAGS_MODULE
:= --cfg MODULE
578 KBUILD_LDFLAGS_MODULE
:=
582 ifeq ($(KBUILD_CLIPPY
),1)
583 RUSTC_OR_CLIPPY_QUIET
:= CLIPPY
584 RUSTC_OR_CLIPPY
= $(CLIPPY_DRIVER
)
586 RUSTC_OR_CLIPPY_QUIET
:= RUSTC
587 RUSTC_OR_CLIPPY
= $(RUSTC
)
594 # Allows the usage of unstable features in stable compilers.
595 export RUSTC_BOOTSTRAP
:= 1
597 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
598 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
599 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
600 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
601 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
602 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
603 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
604 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
606 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
607 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
608 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
609 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
610 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
611 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
613 # Files to ignore in find ... statements
615 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
616 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
619 # ===========================================================================
620 # Rules shared between *config targets and build targets
622 # Basic helpers built in scripts/basic/
623 PHONY
+= scripts_basic
625 $(Q
)$(MAKE
) $(build
)=scripts
/basic
627 PHONY
+= outputmakefile
628 ifdef building_out_of_srctree
629 # Before starting out-of-tree build, make sure the source tree is clean.
630 # outputmakefile generates a Makefile in the output directory, if using a
631 # separate output directory. This allows convenient use of make in the
633 # At the same time when output Makefile generated, generate .gitignore to
634 # ignore whole output directory
636 quiet_cmd_makefile
= GEN Makefile
638 echo
"\# Automatically generated by $(srctree)/Makefile: don't edit"; \
639 echo
"include $(srctree)/Makefile"; \
643 @if
[ -f
$(srctree
)/.config
-o \
644 -d
$(srctree
)/include/config
-o \
645 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
647 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
648 echo
>&2 "*** in $(abs_srctree)";\
652 $(Q
)ln
-fsn
$(srctree
) source
654 $(Q
)test -e .gitignore || \
655 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
658 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
659 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
660 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
661 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
662 CC_VERSION_TEXT
= $(subst $(pound
),,$(shell LC_ALL
=C
$(CC
) --version
2>/dev
/null | head
-n
1))
664 ifneq ($(findstring clang
,$(CC_VERSION_TEXT
)),)
665 include $(srctree
)/scripts
/Makefile.clang
668 # Include this also for config targets because some architectures need
669 # cc-cross-prefix to determine CROSS_COMPILE.
671 include $(srctree
)/scripts
/Makefile.compiler
675 # ===========================================================================
676 # *config targets only - make sure prerequisites are updated, and descend
677 # in scripts/kconfig to make the *config target
679 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
680 # KBUILD_DEFCONFIG may point out an alternative default configuration
681 # used for 'make defconfig'
682 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
683 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
685 config
: outputmakefile scripts_basic FORCE
686 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
688 %config
: outputmakefile scripts_basic FORCE
689 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
692 # ===========================================================================
693 # Build targets only - this includes vmlinux, arch-specific targets, clean
694 # targets and others. In general all targets except *config targets.
696 # If building an external module we do not care about the all: rule
697 # but instead __all depend on modules
699 ifeq ($(KBUILD_EXTMOD
),)
707 # Decide whether to build built-in, modular, or both.
708 # Normally, just do built-in.
713 # If we have only "make modules", don't compile built-in objects.
714 ifeq ($(MAKECMDGOALS
),modules
)
718 # If we have "make <whatever> modules", compile modules
719 # in addition to whatever we do anyway.
720 # Just "make" or "make all" shall build modules as well
722 ifneq ($(filter all modules nsdeps
%compile_commands.json clang-
%,$(MAKECMDGOALS
)),)
726 ifeq ($(MAKECMDGOALS
),)
730 export KBUILD_MODULES KBUILD_BUILTIN
733 include include/config
/auto.conf
736 ifeq ($(KBUILD_EXTMOD
),)
737 # Objects we will link into vmlinux / subdirs we need to visit
741 endif # KBUILD_EXTMOD
743 # The all: target is the default when no target is given on the
745 # This allow a user to issue only 'make' to build a kernel including modules
746 # Defaults to vmlinux, but the arch makefile usually adds further targets
749 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
750 ifdef CONFIG_CC_IS_GCC
751 CFLAGS_GCOV
+= -fno-tree-loop-im
755 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
756 ifdef CONFIG_FUNCTION_TRACER
757 CC_FLAGS_FTRACE
:= -pg
760 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
763 ifdef may-sync-config
764 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
765 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
766 # because some architectures define CROSS_COMPILE there.
767 include include/config
/auto.conf.cmd
771 @echo
>&2 '*** Configuration file "$@" not found!'
773 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
774 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
778 # The actual configuration files used during the build are stored in
779 # include/generated/ and include/config/. Update them if .config is newer than
780 # include/config/auto.conf (which mirrors .config).
782 # This exploits the 'multi-target pattern rule' trick.
783 # The syncconfig should be executed only once to make all the targets.
784 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
786 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
787 # so you cannot notice that Kconfig is waiting for the user input.
788 %/config
/auto.conf
%/config
/auto.conf.cmd
%/generated
/autoconf.h
%/generated
/rustc_cfg
: $(KCONFIG_CONFIG
)
789 $(Q
)$(kecho
) " SYNC $@"
790 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
791 else # !may-sync-config
792 # External modules and some install targets need include/generated/autoconf.h
793 # and include/config/auto.conf but do not care if they are up-to-date.
794 # Use auto.conf to trigger the test
795 PHONY
+= include/config
/auto.conf
797 include/config
/auto.conf
:
798 @
test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
800 echo
>&2 " ERROR: Kernel configuration is invalid."; \
801 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
802 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
806 endif # may-sync-config
809 KBUILD_CFLAGS
+= -fno-delete-null-pointer-checks
811 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
813 KBUILD_RUSTFLAGS
+= -Copt-level
=2
814 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
816 KBUILD_RUSTFLAGS
+= -Copt-level
=s
819 # Always set `debug-assertions` and `overflow-checks` because their default
820 # depends on `opt-level` and `debug-assertions`, respectively.
821 KBUILD_RUSTFLAGS
+= -Cdebug-assertions
=$(if
$(CONFIG_RUST_DEBUG_ASSERTIONS
),y
,n
)
822 KBUILD_RUSTFLAGS
+= -Coverflow-checks
=$(if
$(CONFIG_RUST_OVERFLOW_CHECKS
),y
,n
)
824 # Tell gcc to never replace conditional load with a non-conditional one
825 ifdef CONFIG_CC_IS_GCC
826 # gcc-10 renamed --param=allow-store-data-races=0 to
827 # -fno-allow-store-data-races.
828 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
829 KBUILD_CFLAGS
+= $(call cc-option
,-fno-allow-store-data-races
)
832 ifdef CONFIG_READABLE_ASM
833 # Disable optimizations that make assembler listings hard to read.
834 # reorder blocks reorders the control in the function
835 # ipa clone creates specialized cloned functions
836 # partial inlining inlines only parts of functions
837 KBUILD_CFLAGS
+= -fno-reorder-blocks
-fno-ipa-cp-clone
-fno-partial-inlining
840 stackp-flags-y
:= -fno-stack-protector
841 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
842 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
844 KBUILD_CFLAGS
+= $(stackp-flags-y
)
846 KBUILD_RUSTFLAGS-
$(CONFIG_WERROR
) += -Dwarnings
847 KBUILD_RUSTFLAGS
+= $(KBUILD_RUSTFLAGS-y
)
849 ifdef CONFIG_FRAME_POINTER
850 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
851 KBUILD_RUSTFLAGS
+= -Cforce-frame-pointers
=y
853 # Some targets (ARM with Thumb2, for example), can't be built with frame
854 # pointers. For those, we don't have FUNCTION_TRACER automatically
855 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
856 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
857 # -fomit-frame-pointer with FUNCTION_TRACER.
858 # In the Rust target specification, "frame-pointer" is set explicitly
860 ifndef CONFIG_FUNCTION_TRACER
861 KBUILD_CFLAGS
+= -fomit-frame-pointer
865 # Initialize all stack variables with a 0xAA pattern.
866 ifdef CONFIG_INIT_STACK_ALL_PATTERN
867 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
870 # Initialize all stack variables with a zero value.
871 ifdef CONFIG_INIT_STACK_ALL_ZERO
872 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=zero
873 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
874 # https://github.com/llvm/llvm-project/issues/44842
875 CC_AUTO_VAR_INIT_ZERO_ENABLER
:= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
876 export CC_AUTO_VAR_INIT_ZERO_ENABLER
877 KBUILD_CFLAGS
+= $(CC_AUTO_VAR_INIT_ZERO_ENABLER
)
881 # While VLAs have been removed, GCC produces unreachable stack probes
882 # for the randomize_kstack_offset feature. Disable it for all compilers.
883 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-clash-protection
)
885 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
886 ifdef CONFIG_ZERO_CALL_USED_REGS
887 KBUILD_CFLAGS
+= -fzero-call-used-regs
=used-gpr
890 ifdef CONFIG_FUNCTION_TRACER
891 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
892 CC_FLAGS_FTRACE
+= -mrecord-mcount
893 ifdef CONFIG_HAVE_NOP_MCOUNT
894 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
895 CC_FLAGS_FTRACE
+= -mnop-mcount
896 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
900 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
901 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
902 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
905 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
906 ifdef CONFIG_HAVE_C_RECORDMCOUNT
907 BUILD_C_RECORDMCOUNT
:= y
908 export BUILD_C_RECORDMCOUNT
911 ifdef CONFIG_HAVE_FENTRY
912 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
913 ifeq ($(call cc-option-yn
, -mfentry
),y
)
914 CC_FLAGS_FTRACE
+= -mfentry
915 CC_FLAGS_USING
+= -DCC_USING_FENTRY
918 export CC_FLAGS_FTRACE
919 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
920 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
923 # We trigger additional mismatches with less inlining
924 ifdef CONFIG_DEBUG_SECTION_MISMATCH
925 KBUILD_CFLAGS
+= -fno-inline-functions-called-once
928 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
929 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
930 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
931 KBUILD_RUSTFLAGS_KERNEL
+= -Zfunction-sections
=y
932 LDFLAGS_vmlinux
+= --gc-sections
935 ifdef CONFIG_SHADOW_CALL_STACK
936 ifndef CONFIG_DYNAMIC_SCS
937 CC_FLAGS_SCS
:= -fsanitize
=shadow-call-stack
938 KBUILD_CFLAGS
+= $(CC_FLAGS_SCS
)
943 ifdef CONFIG_LTO_CLANG
944 ifdef CONFIG_LTO_CLANG_THIN
945 CC_FLAGS_LTO
:= -flto
=thin
-fsplit-lto-unit
946 KBUILD_LDFLAGS
+= --thinlto-cache-dir
=$(extmod_prefix
).thinlto-cache
948 CC_FLAGS_LTO
:= -flto
950 CC_FLAGS_LTO
+= -fvisibility
=hidden
952 # Limit inlining across translation units to reduce binary size
953 KBUILD_LDFLAGS
+= -mllvm
-import-instr-limit
=5
955 # Check for frame size exceeding threshold during prolog/epilog insertion
956 # when using lld < 13.0.0.
957 ifneq ($(CONFIG_FRAME_WARN
),0)
958 ifeq ($(call test-lt
, $(CONFIG_LLD_VERSION
), 130000),y
)
959 KBUILD_LDFLAGS
+= -plugin-opt
=-warn-stack-size
=$(CONFIG_FRAME_WARN
)
965 KBUILD_CFLAGS
+= -fno-lto
$(CC_FLAGS_LTO
)
966 KBUILD_AFLAGS
+= -fno-lto
970 ifdef CONFIG_CFI_CLANG
971 CC_FLAGS_CFI
:= -fsanitize
=kcfi
972 KBUILD_CFLAGS
+= $(CC_FLAGS_CFI
)
976 ifneq ($(CONFIG_FUNCTION_ALIGNMENT
),0)
977 KBUILD_CFLAGS
+= -falign-functions
=$(CONFIG_FUNCTION_ALIGNMENT
)
980 # arch Makefile may override CC so keep this after arch Makefile is included
981 NOSTDINC_FLAGS
+= -nostdinc
983 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
984 # the kernel uses only C99 flexible arrays for dynamically sized trailing
985 # arrays. Enforce this for everything that may examine structure sizes and
986 # perform bounds checking.
987 KBUILD_CFLAGS
+= $(call cc-option
, -fstrict-flex-arrays
=3)
989 #Currently, disable -Wstringop-overflow for GCC 11, globally.
990 KBUILD_CFLAGS-
$(CONFIG_CC_NO_STRINGOP_OVERFLOW
) += $(call cc-option
, -Wno-stringop-overflow
)
991 KBUILD_CFLAGS-
$(CONFIG_CC_STRINGOP_OVERFLOW
) += $(call cc-option
, -Wstringop-overflow
)
993 # disable invalid "can't wrap" optimizations for signed / pointers
994 KBUILD_CFLAGS
+= -fno-strict-overflow
996 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
997 KBUILD_CFLAGS
+= -fno-stack-check
999 # conserve stack if available
1000 ifdef CONFIG_CC_IS_GCC
1001 KBUILD_CFLAGS
+= -fconserve-stack
1004 # change __FILE__ to the relative path from the srctree
1005 KBUILD_CPPFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
1007 # include additional Makefiles when needed
1008 include-y
:= scripts
/Makefile.extrawarn
1009 include-
$(CONFIG_DEBUG_INFO
) += scripts
/Makefile.debug
1010 include-
$(CONFIG_DEBUG_INFO_BTF
)+= scripts
/Makefile.btf
1011 include-
$(CONFIG_KASAN
) += scripts
/Makefile.kasan
1012 include-
$(CONFIG_KCSAN
) += scripts
/Makefile.kcsan
1013 include-
$(CONFIG_KMSAN
) += scripts
/Makefile.kmsan
1014 include-
$(CONFIG_UBSAN
) += scripts
/Makefile.ubsan
1015 include-
$(CONFIG_KCOV
) += scripts
/Makefile.kcov
1016 include-
$(CONFIG_RANDSTRUCT
) += scripts
/Makefile.randstruct
1017 include-
$(CONFIG_GCC_PLUGINS
) += scripts
/Makefile.gcc-plugins
1019 include $(addprefix $(srctree
)/, $(include-y
))
1021 # scripts/Makefile.gcc-plugins is intentionally included last.
1022 # Do not add $(call cc-option,...) below this line. When you build the kernel
1023 # from the clean source tree, the GCC plugins do not exist at this point.
1025 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1026 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
1027 KBUILD_AFLAGS
+= $(KAFLAGS
)
1028 KBUILD_CFLAGS
+= $(KCFLAGS
)
1029 KBUILD_RUSTFLAGS
+= $(KRUSTFLAGS
)
1031 KBUILD_LDFLAGS_MODULE
+= --build-id
=sha1
1032 LDFLAGS_vmlinux
+= --build-id
=sha1
1034 KBUILD_LDFLAGS
+= -z noexecstack
1035 ifeq ($(CONFIG_LD_IS_BFD
),y
)
1036 KBUILD_LDFLAGS
+= $(call ld-option
,--no-warn-rwx-segments
)
1039 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
1040 LDFLAGS_vmlinux
+= -X
1043 ifeq ($(CONFIG_RELR
),y
)
1044 # ld.lld before 15 did not support -z pack-relative-relocs.
1045 LDFLAGS_vmlinux
+= $(call ld-option
,--pack-dyn-relocs
=relr
,-z pack-relative-relocs
)
1048 # We never want expected sections to be placed heuristically by the
1049 # linker. All sections should be explicitly named in the linker script.
1050 ifdef CONFIG_LD_ORPHAN_WARN
1051 LDFLAGS_vmlinux
+= --orphan-handling
=$(CONFIG_LD_ORPHAN_WARN_LEVEL
)
1054 # Align the bit size of userspace programs with the kernel
1055 KBUILD_USERCFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1056 KBUILD_USERLDFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1058 # make the checker run with the right architecture
1059 CHECKFLAGS
+= --arch
=$(ARCH
)
1061 # insure the checker run with the right endianness
1062 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
1064 # the checker needs the correct machine size
1065 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
1067 # Default kernel image to build when no specific target is given.
1068 # KBUILD_IMAGE may be overruled on the command line or
1069 # set in the environment
1070 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1071 # this default value
1072 export KBUILD_IMAGE ?
= vmlinux
1075 # INSTALL_PATH specifies where to place the updated kernel and system map
1076 # images. Default is /boot, but you can set it to other values
1077 export INSTALL_PATH ?
= /boot
1080 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1081 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1082 # an argument if needed. Otherwise it defaults to the kernel install path
1084 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
1087 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1088 # relocations required by build roots. This is not defined in the
1089 # makefile but the argument can be passed to make if needed.
1092 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
1097 export extmod_prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
1098 export MODORDER
:= $(extmod_prefix
)modules.order
1099 export MODULES_NSDEPS
:= $(extmod_prefix
)modules.nsdeps
1101 ifeq ($(KBUILD_EXTMOD
),)
1104 clean-dirs
:= $(sort . Documentation \
1105 $(patsubst %/,%,$(filter %/, $(core-
) \
1106 $(drivers-
) $(libs-
))))
1108 export ARCH_CORE
:= $(core-y
)
1109 export ARCH_LIB
:= $(filter %/, $(libs-y
))
1110 export ARCH_DRIVERS
:= $(drivers-y
) $(drivers-m
)
1111 # Externally visible symbols (used by link-vmlinux.sh)
1113 KBUILD_VMLINUX_OBJS
:= .
/built-in.a
1114 ifdef CONFIG_MODULES
1115 KBUILD_VMLINUX_OBJS
+= $(patsubst %/, %/lib.a
, $(filter %/, $(libs-y
)))
1116 KBUILD_VMLINUX_LIBS
:= $(filter-out %/, $(libs-y
))
1118 KBUILD_VMLINUX_LIBS
:= $(patsubst %/,%/lib.a
, $(libs-y
))
1121 export KBUILD_VMLINUX_LIBS
1122 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1124 ifdef CONFIG_TRIM_UNUSED_KSYMS
1125 # For the kernel to actually contain only the needed exported symbols,
1126 # we have to build modules as well to determine what those symbols are.
1130 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1131 quiet_cmd_ar_vmlinux.a
= AR
$@
1132 cmd_ar_vmlinux.a
= \
1134 $(AR
) cDPrST
$@
$(KBUILD_VMLINUX_OBJS
); \
1135 $(AR
) mPiT
$$($(AR
) t
$@ | sed
-n
1p
) $@
$$($(AR
) t
$@ | grep
-F
-f
$(srctree
)/scripts
/head-object-list.txt
)
1137 targets
+= vmlinux.a
1138 vmlinux.a
: $(KBUILD_VMLINUX_OBJS
) scripts
/head-object-list.txt FORCE
1139 $(call if_changed
,ar_vmlinux.a
)
1142 vmlinux_o
: vmlinux.a
$(KBUILD_VMLINUX_LIBS
)
1143 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux_o
1145 vmlinux.o modules.builtin.modinfo modules.builtin
: vmlinux_o
1149 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1150 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1151 # unrelated; the decompressors just happen to have the same base name,
1152 # arch/*/boot/compressed/vmlinux.
1153 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1155 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1156 # https://savannah.gnu.org/bugs/?61463
1157 # For Make > 4.4, the following simple code will work:
1158 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1159 vmlinux
: private _LDFLAGS_vmlinux
:= $(LDFLAGS_vmlinux
)
1160 vmlinux
: export LDFLAGS_vmlinux
= $(_LDFLAGS_vmlinux
)
1161 vmlinux
: vmlinux.o
$(KBUILD_LDS
) modpost
1162 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux
1164 # The actual objects are generated when descending,
1165 # make sure no implicit rule kicks in
1166 $(sort $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)): .
;
1168 ifeq ($(origin KERNELRELEASE
),file
)
1169 filechk_kernel.release
= $(srctree
)/scripts
/setlocalversion
$(srctree
)
1171 filechk_kernel.release
= echo
$(KERNELRELEASE
)
1174 # Store (new) KERNELRELEASE string in include/config/kernel.release
1175 include/config
/kernel.release
: FORCE
1176 $(call filechk
,kernel.release
)
1178 # Additional helpers built in scripts/
1179 # Carefully list dependencies so we do not try to build scripts twice
1182 scripts
: scripts_basic scripts_dtc
1183 $(Q
)$(MAKE
) $(build
)=$(@
)
1185 # Things we need to do before we recursively start building the kernel
1186 # or the modules are listed in "prepare".
1187 # A multi level approach is used. prepareN is processed before prepareN-1.
1188 # archprepare is used in arch Makefiles and when processed asm symlink,
1189 # version.h and scripts_basic is processed / created.
1191 PHONY
+= prepare archprepare
1193 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1194 asm-generic
$(version_h
) include/generated
/utsrelease.h \
1195 include/generated
/compile.h
include/generated
/autoconf.h remove-stale-files
1197 prepare0
: archprepare
1198 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1199 $(Q
)$(MAKE
) $(build
)=. prepare
1201 # All the preparing..
1204 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
1205 $(Q
)$(MAKE
) $(build
)=rust
1208 PHONY
+= remove-stale-files
1210 $(Q
)$(srctree
)/scripts
/remove-stale-files
1212 # Support for using generic headers in asm-generic
1213 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1215 PHONY
+= asm-generic uapi-asm-generic
1216 asm-generic
: uapi-asm-generic
1217 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1218 generic
=include/asm-generic
1220 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1221 generic
=include/uapi
/asm-generic
1223 # Generate some files
1224 # ---------------------------------------------------------------------------
1226 # KERNELRELEASE can change from a few different places, meaning version.h
1227 # needs to be updated, so this check is forced on all builds
1230 define filechk_utsrelease.h
1231 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1232 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1235 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1238 define filechk_version.h
1239 if
[ $(SUBLEVEL
) -gt
255 ]; then \
1240 echo \
#define LINUX_VERSION_CODE $(shell \
1241 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + 255); \
1243 echo \
#define LINUX_VERSION_CODE $(shell \
1244 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
1246 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1247 ((c) > 255 ? 255 : (c)))'; \
1248 echo \
#define LINUX_VERSION_MAJOR $(VERSION); \
1249 echo \
#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1250 echo \
#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1253 $(version_h
): PATCHLEVEL
:= $(or
$(PATCHLEVEL
), 0)
1254 $(version_h
): SUBLEVEL
:= $(or
$(SUBLEVEL
), 0)
1256 $(call filechk
,version.h
)
1258 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1259 $(call filechk
,utsrelease.h
)
1261 filechk_compile.h
= $(srctree
)/scripts
/mkcompile_h \
1262 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1264 include/generated
/compile.h
: FORCE
1265 $(call filechk
,compile.h
)
1269 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1270 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1272 # ---------------------------------------------------------------------------
1275 #Default location for installed headers
1276 export INSTALL_HDR_PATH
= $(objtree
)/usr
1278 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1279 cmd_headers_install
= \
1280 mkdir
-p
$(INSTALL_HDR_PATH
); \
1281 rsync
-mrl
--include='*/' --include='*\.h' --exclude
='*' \
1282 usr
/include $(INSTALL_HDR_PATH
)
1284 PHONY
+= headers_install
1285 headers_install
: headers
1286 $(call cmd
,headers_install
)
1288 PHONY
+= archheaders archscripts
1290 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1293 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1294 $(if
$(filter um
, $(SRCARCH
)), $(error Headers not exportable for UML
))
1295 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1296 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1298 ifdef CONFIG_HEADERS_INSTALL
1302 PHONY
+= scripts_unifdef
1303 scripts_unifdef
: scripts_basic
1304 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1306 # ---------------------------------------------------------------------------
1309 # Many distributions have the custom install script, /sbin/installkernel.
1310 # If DKMS is installed, 'make install' will eventually recurse back
1311 # to this Makefile to build and install external modules.
1312 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1314 quiet_cmd_install
= INSTALL
$(INSTALL_PATH
)
1315 cmd_install
= unset sub_make_done
; $(srctree
)/scripts
/install.sh
1317 # ---------------------------------------------------------------------------
1320 PHONY
+= vdso_install
1321 vdso_install
: export INSTALL_FILES
= $(vdso-install-y
)
1323 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vdsoinst
1325 # ---------------------------------------------------------------------------
1328 ifdef CONFIG_OBJTOOL
1329 prepare
: tools
/objtool
1333 ifdef CONFIG_DEBUG_INFO_BTF
1334 prepare
: tools
/bpf
/resolve_btfids
1338 PHONY
+= resolve_btfids_clean
1340 resolve_btfids_O
= $(abspath
$(objtree
))/tools
/bpf
/resolve_btfids
1342 # tools/bpf/resolve_btfids directory might not exist
1343 # in output directory, skip its clean in that case
1344 resolve_btfids_clean
:
1345 ifneq ($(wildcard $(resolve_btfids_O
)),)
1346 $(Q
)$(MAKE
) -sC
$(srctree
)/tools
/bpf
/resolve_btfids O
=$(resolve_btfids_O
) clean
1349 # Clear a bunch of variables before executing the submake
1350 ifeq ($(quiet
),silent_
)
1355 $(Q
)mkdir
-p
$(objtree
)/tools
1356 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1359 $(Q
)mkdir
-p
$(objtree
)/tools
1360 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1362 # ---------------------------------------------------------------------------
1367 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1369 kselftest-
%: headers FORCE
1370 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1372 PHONY
+= kselftest-merge
1374 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1375 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config
-o
-name config.
$(UTS_MACHINE
) | \
1376 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-y
-m
$(objtree
)/.config
1377 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1379 # ---------------------------------------------------------------------------
1382 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1383 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1389 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1391 %.dtbo
: dtbs_prepare
1392 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1394 PHONY
+= dtbs dtbs_prepare dtbs_install dtbs_check
1396 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1398 # include/config/kernel.release is actually needed when installing DTBs because
1399 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1400 # dtbs_install depend on it as dtbs_install may run as root.
1401 dtbs_prepare
: include/config
/kernel.release scripts_dtc
1403 ifneq ($(filter dtbs_check
, $(MAKECMDGOALS
)),)
1407 ifneq ($(CHECK_DTBS
),)
1408 dtbs_prepare
: dt_binding_check
1414 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
) dst
=$(INSTALL_DTBS_PATH
)
1416 ifdef CONFIG_OF_EARLY_FLATTREE
1422 PHONY
+= scripts_dtc
1423 scripts_dtc
: scripts_basic
1424 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1426 ifneq ($(filter dt_binding_check
, $(MAKECMDGOALS
)),)
1427 export CHECK_DT_BINDING
=y
1430 PHONY
+= dt_binding_check
1431 dt_binding_check
: scripts_dtc
1432 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1434 PHONY
+= dt_compatible_check
1435 dt_compatible_check
: dt_binding_check
1436 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
$@
1438 # ---------------------------------------------------------------------------
1441 ifdef CONFIG_MODULES
1443 # By default, build modules as well
1447 # When we're building modules with modversions, we need to consider
1448 # the built-in objects during the descend as well, in order to
1449 # make sure the checksums are up to date before we record them.
1450 ifdef CONFIG_MODVERSIONS
1457 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1459 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1464 modules
: modules_prepare
1466 # Target to prepare building external modules
1467 modules_prepare
: prepare
1468 $(Q
)$(MAKE
) $(build
)=scripts scripts
/module.lds
1470 endif # CONFIG_MODULES
1473 # Cleaning is done on three levels.
1474 # make clean Delete most generated files
1475 # Leave enough to build external modules
1476 # make mrproper Delete the current configuration, and all generated files
1477 # make distclean Remove editor backup files, patch leftover files and the like
1479 # Directories & files removed with 'make clean'
1480 CLEAN_FILES
+= vmlinux.symvers modules-only.symvers \
1481 modules.builtin modules.builtin.modinfo modules.nsdeps \
1482 compile_commands.json .thinlto-cache rust
/test \
1483 rust-project.json .vmlinux.objs .vmlinux.
export.c
1485 # Directories & files removed with 'make mrproper'
1486 MRPROPER_FILES
+= include/config
include/generated \
1487 arch
/$(SRCARCH
)/include/generated .objdiff \
1488 debian snap tar-install \
1489 .config .config.old .version \
1491 certs
/signing_key.pem \
1497 # clean - Delete most, but leave enough to build external modules
1499 clean: rm-files
:= $(CLEAN_FILES
)
1501 PHONY
+= archclean vmlinuxclean
1504 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1505 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1507 clean: archclean vmlinuxclean resolve_btfids_clean
1509 # mrproper - Delete all generated files, including .config
1511 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1512 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1514 PHONY
+= $(mrproper-dirs
) mrproper
1516 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1518 mrproper
: clean $(mrproper-dirs
)
1520 @find .
$(RCS_FIND_IGNORE
) \
1521 \
( -name
'*.rmeta' \
) \
1522 -type f
-print | xargs
rm -f
1529 @find .
$(RCS_FIND_IGNORE
) \
1530 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1531 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1532 -o
-name
'core' -o
-name
tags -o
-name TAGS
-o
-name
'cscope*' \
1533 -o
-name GPATH
-o
-name GRTAGS
-o
-name GSYMS
-o
-name GTAGS \
) \
1534 -type f
-print | xargs
rm -f
1537 # Packaging of the kernel to various formats
1538 # ---------------------------------------------------------------------------
1541 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1542 %pkg
: include/config
/kernel.release FORCE
1543 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1545 # Brief documentation of the typical targets used
1546 # ---------------------------------------------------------------------------
1548 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1549 boards
:= $(sort $(notdir $(boards
)))
1550 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1551 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1555 @echo
'Cleaning targets:'
1556 @echo
' clean - Remove most generated files but keep the config and'
1557 @echo
' enough build support to build external modules'
1558 @echo
' mrproper - Remove all generated files + config + various backup files'
1559 @echo
' distclean - mrproper + remove editor backup and patch files'
1561 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1563 @echo
'Other generic targets:'
1564 @echo
' all - Build all targets marked with [*]'
1565 @echo
'* vmlinux - Build the bare kernel'
1566 @echo
'* modules - Build all modules'
1567 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1568 @echo
' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1569 @echo
' dir/ - Build all files in dir and below'
1570 @echo
' dir/file.[ois] - Build specified target only'
1571 @echo
' dir/file.ll - Build the LLVM assembly file'
1572 @echo
' (requires compiler support for LLVM assembly generation)'
1573 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1574 @echo
' (requires a recent binutils and recent build (System.map))'
1575 @echo
' dir/file.ko - Build module including final link'
1576 @echo
' modules_prepare - Set up for building external modules'
1577 @echo
' tags/TAGS - Generate tags file for editors'
1578 @echo
' cscope - Generate cscope index'
1579 @echo
' gtags - Generate GNU GLOBAL index'
1580 @echo
' kernelrelease - Output the release version string (use with make -s)'
1581 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1582 @echo
' image_name - Output the image name (use with make -s)'
1583 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1584 echo
' (default: $(INSTALL_HDR_PATH))'; \
1586 @echo
'Static analysers:'
1587 @echo
' checkstack - Generate a list of stack hogs and consider all functions'
1588 @echo
' with a stack size larger than MINSTACKSIZE (default: 100)'
1589 @echo
' versioncheck - Sanity check on version.h usage'
1590 @echo
' includecheck - Check for duplicate included header files'
1591 @echo
' export_report - List the usages of all exported symbols'
1592 @echo
' headerdep - Detect inclusion cycles in headers'
1593 @echo
' coccicheck - Check with Coccinelle'
1594 @echo
' clang-analyzer - Check with clang static analyzer'
1595 @echo
' clang-tidy - Check with clang-tidy'
1598 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1600 @echo
'Kernel selftest:'
1601 @echo
' kselftest - Build and run kernel selftest'
1602 @echo
' Build, install, and boot kernel before'
1603 @echo
' running kselftest on it'
1604 @echo
' Run as root for full coverage'
1605 @echo
' kselftest-all - Build kernel selftest'
1606 @echo
' kselftest-install - Build and install kernel selftest'
1607 @echo
' kselftest-clean - Remove all generated kselftest files'
1608 @echo
' kselftest-merge - Merge all the config dependencies of'
1609 @echo
' kselftest to existing .config.'
1611 @echo
'Rust targets:'
1612 @echo
' rustavailable - Checks whether the Rust toolchain is'
1613 @echo
' available and, if not, explains why.'
1614 @echo
' rustfmt - Reformat all the Rust code in the kernel'
1615 @echo
' rustfmtcheck - Checks if all the Rust code in the kernel'
1616 @echo
' is formatted, printing a diff otherwise.'
1617 @echo
' rustdoc - Generate Rust documentation'
1618 @echo
' (requires kernel .config)'
1619 @echo
' rusttest - Runs the Rust tests'
1620 @echo
' (requires kernel .config; downloads external repos)'
1621 @echo
' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1622 @echo
' (requires kernel .config)'
1623 @echo
' dir/file.[os] - Build specified target only'
1624 @echo
' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1625 @echo
' Run with RUSTFMT=n to skip reformatting if needed.'
1626 @echo
' The output is not intended to be compilable.'
1627 @echo
' dir/file.ll - Build the LLVM assembly file'
1630 echo
'Devicetree:'; \
1631 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1632 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1633 echo
' dt_binding_check - Validate device tree binding documents'; \
1634 echo
' dtbs_check - Validate device tree source files';\
1637 @echo
'Userspace tools targets:'
1638 @echo
' use "make tools/help"'
1639 @echo
' or "cd tools; make help"'
1641 @echo
'Kernel packaging:'
1642 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1644 @echo
'Documentation targets:'
1645 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1647 @echo
'Architecture-specific targets ($(SRCARCH)):'
1649 echo
' No architecture-specific help defined for $(SRCARCH)')
1652 $(foreach b
, $(boards
), \
1653 printf
" %-27s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1655 @
$(if
$(board-dirs
), \
1656 $(foreach b
, $(board-dirs
), \
1657 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1658 printf
" %-16s - Show all of the above\\n" help-boards
; \
1661 @echo
' make V=n [targets] 1: verbose build'
1662 @echo
' 2: give reason for rebuild of target'
1663 @echo
' V=1 and V=2 can be combined with V=12'
1664 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1665 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK'
1666 @echo
' (sparse by default)'
1667 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1668 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1669 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1670 @echo
' 1: warnings which may be relevant and do not occur too often'
1671 @echo
' 2: warnings which occur quite often but may still be relevant'
1672 @echo
' 3: more obscure warnings, can most likely be ignored'
1673 @echo
' c: extra checks in the configuration stage (Kconfig)'
1674 @echo
' e: warnings are being treated as errors'
1675 @echo
' Multiple levels can be combined with W=12 or W=123'
1677 echo
' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1678 echo
' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1681 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1682 @echo
'For further info see the ./README file'
1685 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1687 help-boards
: $(help-board-dirs
)
1689 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1691 $(help-board-dirs
): help-
%:
1692 @echo
'Architecture-specific targets ($(SRCARCH) $*):'
1693 @
$(if
$(boards-per-dir
), \
1694 $(foreach b
, $(boards-per-dir
), \
1695 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1699 # Documentation targets
1700 # ---------------------------------------------------------------------------
1701 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1702 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1703 PHONY
+= $(DOC_TARGETS
)
1705 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1709 # ---------------------------------------------------------------------------
1711 # "Is Rust available?" target
1712 PHONY
+= rustavailable
1714 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
&& echo
"Rust is available!"
1716 # Documentation target
1718 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1721 $(Q
)$(MAKE
) $(build
)=rust
$@
1726 $(Q
)$(MAKE
) $(build
)=rust
$@
1728 # Formatting targets
1729 PHONY
+= rustfmt rustfmtcheck
1731 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1733 # We match using absolute paths since `find` does not resolve them
1734 # when matching, which is a problem when e.g. `srctree` is `..`.
1735 # We `grep` afterwards in order to remove the directory entry itself.
1737 $(Q
)find
$(abs_srctree
) -type f
-name
'*.rs' \
1738 -o
-path
$(abs_srctree
)/rust
/alloc
-prune \
1739 -o
-path
$(abs_objtree
)/rust
/test -prune \
1740 | grep
-Fv
$(abs_srctree
)/rust
/alloc \
1741 | grep
-Fv
$(abs_objtree
)/rust
/test \
1742 | grep
-Fv generated \
1743 | xargs
$(RUSTFMT
) $(rustfmt_flags
)
1745 rustfmtcheck
: rustfmt_flags
= --check
1746 rustfmtcheck
: rustfmt
1749 # ---------------------------------------------------------------------------
1753 $(Q
)$(srctree
)/scripts
/misc-check
1757 PHONY
+= scripts_gdb
1758 scripts_gdb
: prepare0
1759 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1760 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1762 ifdef CONFIG_GDB_SCRIPTS
1766 else # KBUILD_EXTMOD
1768 filechk_kernel.release
= echo
$(KERNELRELEASE
)
1771 # External module support.
1772 # When building external modules the kernel used as basis is considered
1773 # read-only, and no consistency checks are made and the make
1774 # system is not used on the basis kernel. If updates are required
1775 # in the basis kernel ordinary make commands (without M=...) must be used.
1777 # We are always building only modules.
1781 build-dir
:= $(KBUILD_EXTMOD
)
1783 compile_commands.json
: $(extmod_prefix
)compile_commands.json
1784 PHONY
+= compile_commands.json
1786 clean-dirs
:= $(KBUILD_EXTMOD
)
1787 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
$(KBUILD_EXTMOD
)/modules.nsdeps \
1788 $(KBUILD_EXTMOD
)/compile_commands.json
$(KBUILD_EXTMOD
)/.thinlto-cache
1791 # now expand this into a simple variable to reduce the cost of shell evaluations
1792 prepare
: CC_VERSION_TEXT
:= $(CC_VERSION_TEXT
)
1794 @if
[ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1795 echo
>&2 "warning: the compiler differs from the one used to build the kernel"; \
1796 echo
>&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1797 echo
>&2 " You are using: $(CC_VERSION_TEXT)"; \
1802 @echo
' Building external modules.'
1803 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1805 @echo
' modules - default target, build the module(s)'
1806 @echo
' modules_install - install the module'
1807 @echo
' clean - remove generated files in module directory only'
1808 @echo
' rust-analyzer - generate rust-project.json rust-analyzer support file'
1811 ifndef CONFIG_MODULES
1812 modules modules_install
: __external_modules_error
1813 __external_modules_error
:
1815 @echo
>&2 '*** The present kernel disabled CONFIG_MODULES.'
1816 @echo
>&2 '*** You cannot build or install external modules.'
1821 endif # KBUILD_EXTMOD
1823 # ---------------------------------------------------------------------------
1826 PHONY
+= modules modules_install modules_sign modules_prepare
1829 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst \
1830 sign-only
=$(if
$(filter modules_install
,$(MAKECMDGOALS
)),,y
)
1832 ifeq ($(CONFIG_MODULE_SIG
),y
)
1833 # modules_sign is a subset of modules_install.
1834 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1835 modules_sign
: modules_install
1840 @echo
>&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1845 ifdef CONFIG_MODULES
1847 $(MODORDER
): $(build-dir
)
1850 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1851 # This is solely useful to speed up test compiles.
1853 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
1854 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
1857 PHONY
+= modules_check
1858 modules_check
: $(MODORDER
)
1859 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
$<
1861 else # CONFIG_MODULES
1868 endif # CONFIG_MODULES
1871 modpost
: $(if
$(single-build
),, $(if
$(KBUILD_BUILTIN
), vmlinux.o
)) \
1872 $(if
$(KBUILD_MODULES
), modules_check
)
1873 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1876 # ---------------------------------------------------------------------------
1877 # To build individual files in subdirectories, you can do like this:
1879 # make foo/bar/baz.s
1881 # The supported suffixes for single-target are listed in 'single-targets'
1883 # To build only under specific subdirectories, you can do like this:
1889 # .ko is special because modpost is needed
1890 single-ko
:= $(sort $(filter %.ko
, $(MAKECMDGOALS
)))
1891 single-no-ko
:= $(filter-out $(single-ko
), $(MAKECMDGOALS
)) \
1892 $(foreach x
, o mod
, $(patsubst %.ko
, %.
$x, $(single-ko
)))
1894 $(single-ko
): single_modules
1896 $(single-no-ko
): $(build-dir
)
1899 # Remove MODORDER when done because it is not the real one.
1900 PHONY
+= single_modules
1901 single_modules
: $(single-no-ko
) modules_prepare
1902 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod_prefix
)$(m
:%.ko
=%.o
);) } > $(MODORDER
)
1903 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1904 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
1905 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
1907 $(Q
)rm -f
$(MODORDER
)
1909 single-goals
:= $(addprefix $(build-dir
)/, $(single-no-ko
))
1915 # Preset locale variables to speed up the build process. Limit locale
1916 # tweaks to this spot to avoid wrong language settings when running
1917 # make menuconfig etc.
1918 # Error messages still appears in the original language
1919 PHONY
+= $(build-dir
)
1920 $(build-dir
): prepare
1921 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1 need-modorder
=1 $(single-goals
)
1923 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
1924 PHONY
+= $(clean-dirs
) clean
1926 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1928 clean: $(clean-dirs
)
1930 @find
$(or
$(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1931 \
( -name
'*.[aios]' -o
-name
'*.rsi' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1933 -o
-name
'*.dtb' -o
-name
'*.dtbo' \
1934 -o
-name
'*.dtb.S' -o
-name
'*.dtbo.S' \
1935 -o
-name
'*.dt.yaml' \
1936 -o
-name
'*.dwo' -o
-name
'*.lst' \
1937 -o
-name
'*.su' -o
-name
'*.mod' \
1938 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1939 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1940 -o
-name
'*.asn1.[ch]' \
1941 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1942 -o
-name
'*.c.[012]*.*' \
1945 -o
-name
'*.*.symversions' \
) -type f
-print \
1946 -o
-name
'.tmp_*' -print \
1949 # Generate tags for editors
1950 # ---------------------------------------------------------------------------
1951 quiet_cmd_tags
= GEN
$@
1952 cmd_tags
= $(BASH
) $(srctree
)/scripts
/tags.sh
$@
1954 tags TAGS cscope gtags
: FORCE
1957 # IDE support targets
1958 PHONY
+= rust-analyzer
1960 $(Q
)$(MAKE
) $(build
)=rust
$@
1962 # Script to generate missing namespace dependencies
1963 # ---------------------------------------------------------------------------
1966 nsdeps
: export KBUILD_NSDEPS
=1
1968 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/nsdeps
1971 # ---------------------------------------------------------------------------
1973 quiet_cmd_gen_compile_commands
= GEN
$@
1974 cmd_gen_compile_commands
= $(PYTHON3
) $< -a
$(AR
) -o
$@
$(filter-out $<, $(real-prereqs
))
1976 $(extmod_prefix
)compile_commands.json
: scripts
/clang-tools
/gen_compile_commands.py \
1977 $(if
$(KBUILD_EXTMOD
),, vmlinux.a
$(KBUILD_VMLINUX_LIBS
)) \
1978 $(if
$(CONFIG_MODULES
), $(MODORDER
)) FORCE
1979 $(call if_changed
,gen_compile_commands
)
1981 targets
+= $(extmod_prefix
)compile_commands.json
1983 PHONY
+= clang-tidy clang-analyzer
1985 ifdef CONFIG_CC_IS_CLANG
1986 quiet_cmd_clang_tools
= CHECK
$<
1987 cmd_clang_tools
= $(PYTHON3
) $(srctree
)/scripts
/clang-tools
/run-clang-tools.py
$@
$<
1989 clang-tidy clang-analyzer
: $(extmod_prefix
)compile_commands.json
1990 $(call cmd
,clang_tools
)
1992 clang-tidy clang-analyzer
:
1993 @echo
"$@ requires CC=clang" >&2
1997 # Scripts to check various things for consistency
1998 # ---------------------------------------------------------------------------
2000 PHONY
+= includecheck versioncheck coccicheck export_report
2003 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
2004 -name
'*.[hcS]' -type f
-print |
sort \
2005 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
2008 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
2009 -name
'*.[hcS]' -type f
-print |
sort \
2010 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
2013 $(Q
)$(BASH
) $(srctree
)/scripts
/$@
2016 $(PERL
) $(srctree
)/scripts
/export_report.pl
2018 PHONY
+= checkstack kernelrelease kernelversion image_name
2020 # UML needs a little special treatment here. It wants to use the host
2021 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2022 # else wants $(ARCH), including people doing cross-builds, which means
2023 # that $(SUBARCH) doesn't work here.
2025 CHECKSTACK_ARCH
:= $(SUBARCH
)
2027 CHECKSTACK_ARCH
:= $(ARCH
)
2031 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
2032 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
) $(MINSTACKSIZE
)
2035 @
$(filechk_kernel.release
)
2038 @echo
$(KERNELVERSION
)
2041 @echo
$(KBUILD_IMAGE
)
2043 PHONY
+= run-command
2045 $(Q
)$(KBUILD_RUN_COMMAND
)
2047 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
2048 cmd_rmfiles
= rm -rf
$(rm-files
)
2050 # read saved command lines for existing targets
2051 existing-targets
:= $(wildcard $(sort $(targets
)))
2053 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
2055 endif # config-build
2057 endif # need-sub-make
2062 # Declare the contents of the PHONY variable as phony. We keep that
2063 # information in a variable so we can use it in if_changed and friends.