1 # SPDX-License-Identifier: GPL-2.0
6 NAME
= Hurr durr I
'ma ninja sloth
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 ifeq ($(filter undefine,$(.FEATURES)),)
15 $(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION))
18 $(if $(filter __%, $(MAKECMDGOALS)), \
19 $(error targets prefixed with '__
' are only for internal use))
21 # That's our default target when none is given on the command line
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.a targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 this-makefile
:= $(lastword
$(MAKEFILE_LIST
))
42 export abs_srctree
:= $(realpath
$(dir $(this-makefile
)))
43 export abs_objtree
:= $(CURDIR
)
45 ifneq ($(sub_make_done
),1)
47 # Do not use make's built-in rules and variables
48 # (this increases performance and avoids hard-to-debug behaviour)
51 # Avoid funny character set dependencies
55 export LC_COLLATE LC_NUMERIC
57 # Avoid interference with shell env settings
61 # ---------------------------------------------------------------------------
63 # Most of build commands in Kbuild start with "cmd_". You can optionally define
64 # "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
65 # that command is printed by default.
68 # quiet_cmd_depmod = DEPMOD $(MODLIB)
69 # cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
71 # A simple variant is to prefix commands with $(Q) - that's useful
72 # for commands that shall be hidden in non-verbose mode.
74 # $(Q)$(MAKE) $(build)=scripts/basic
76 # If KBUILD_VERBOSE contains 1, the whole command is echoed.
77 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
79 # To put more focus on warnings, be less verbose as default
80 # Use 'make V=1' to see the full commands
82 ifeq ("$(origin V)", "command line")
89 ifneq ($(findstring 1, $(KBUILD_VERBOSE
)),)
94 # If the user is running make -s (silent mode), suppress echoing of
96 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
98 ifeq ($(filter 3.
%,$(MAKE_VERSION
)),)
99 short-opts
:= $(firstword -$(MAKEFLAGS
))
101 short-opts
:= $(filter-out --%,$(MAKEFLAGS
))
104 ifneq ($(findstring s
,$(short-opts
)),)
106 override KBUILD_VERBOSE
:=
109 export quiet Q KBUILD_VERBOSE
111 # Call a source code checker (by default, "sparse") as part of the
114 # Use 'make C=1' to enable checking of only re-compiled files.
115 # Use 'make C=2' to enable checking of *all* source files, regardless
116 # of whether they are re-compiled or not.
118 # See the file "Documentation/dev-tools/sparse.rst" for more details,
119 # including where to get the "sparse" utility.
121 ifeq ("$(origin C)", "command line")
122 KBUILD_CHECKSRC
= $(C
)
124 ifndef KBUILD_CHECKSRC
128 export KBUILD_CHECKSRC
130 # Enable "clippy" (a linter) as part of the Rust compilation.
132 # Use 'make CLIPPY=1' to enable it.
133 ifeq ("$(origin CLIPPY)", "command line")
134 KBUILD_CLIPPY
:= $(CLIPPY
)
139 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
140 # directory of external module to build. Setting M= takes precedence.
141 ifeq ("$(origin M)", "command line")
142 KBUILD_EXTMOD
:= $(M
)
145 $(if
$(word 2, $(KBUILD_EXTMOD
)), \
146 $(error building multiple external modules is not supported
))
148 $(foreach x
, % :, $(if
$(findstring $x, $(KBUILD_EXTMOD
)), \
149 $(error module directory path cannot contain
'$x')))
151 # Remove trailing slashes
152 ifneq ($(filter %/, $(KBUILD_EXTMOD
)),)
153 KBUILD_EXTMOD
:= $(shell dirname
$(KBUILD_EXTMOD
).
)
158 # Kbuild will save output files in the current working directory.
159 # This does not need to match to the root of the kernel source tree.
161 # For example, you can do this:
163 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
165 # If you want to save output files in a different location, there are
166 # two syntaxes to specify it.
169 # Use "make O=dir/to/store/output/files/"
171 # 2) Set KBUILD_OUTPUT
172 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
173 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
175 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
178 # Do we want to change the working directory?
179 ifeq ("$(origin O)", "command line")
180 KBUILD_OUTPUT
:= $(O
)
183 ifneq ($(KBUILD_OUTPUT
),)
184 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
185 # expand a shell special character '~'. We use a somewhat tedious way here.
186 abs_objtree
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) && pwd
)
187 $(if
$(abs_objtree
),, \
188 $(error failed to create output directory
"$(KBUILD_OUTPUT)"))
190 # $(realpath ...) resolves symlinks
191 abs_objtree
:= $(realpath
$(abs_objtree
))
192 endif # ifneq ($(KBUILD_OUTPUT),)
194 ifneq ($(words $(subst :, ,$(abs_srctree
))), 1)
195 $(error source directory cannot contain spaces or colons
)
198 ifneq ($(filter 3.
%,$(MAKE_VERSION
)),)
199 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
200 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
202 # Cancel implicit rules for this Makefile.
206 export sub_make_done
:= 1
208 endif # sub_make_done
210 ifeq ($(abs_objtree
),$(CURDIR
))
211 # Suppress "Entering directory ..." if we are at the final work directory.
212 no-print-directory
:= --no-print-directory
214 # Recursion to show "Entering directory ..."
218 ifeq ($(filter --no-print-directory
, $(MAKEFLAGS
)),)
219 # If --no-print-directory is unset, recurse once again to set it.
220 # You may end up recursing into __sub-make twice. This is needed due to the
221 # behavior change in GNU Make 4.4.1.
225 ifeq ($(need-sub-make
),1)
227 PHONY
+= $(MAKECMDGOALS
) __sub-make
229 $(filter-out $(this-makefile
), $(MAKECMDGOALS
)) __all
: __sub-make
232 # Invoke a second make in the output directory, passing relevant variables
234 $(Q
)$(MAKE
) $(no-print-directory
) -C
$(abs_objtree
) \
235 -f
$(abs_srctree
)/Makefile
$(MAKECMDGOALS
)
239 # We process the rest of the Makefile if this is the final invocation of make
241 ifeq ($(abs_srctree
),$(abs_objtree
))
242 # building in the source tree
244 building_out_of_srctree
:=
246 ifeq ($(abs_srctree
)/,$(dir $(abs_objtree
)))
247 # building in a subdirectory of the source tree
250 srctree
:= $(abs_srctree
)
252 building_out_of_srctree
:= 1
255 ifneq ($(KBUILD_ABS_SRCTREE
),)
256 srctree
:= $(abs_srctree
)
262 export building_out_of_srctree srctree objtree VPATH
264 # To make sure we do not include .config for any of the *config targets
265 # catch them early, and hand them over to scripts/kconfig/Makefile
266 # It is allowed to specify more targets when calling make, including
267 # mixing *config targets and build targets.
268 # For example 'make oldconfig all'.
269 # Detect when mixed targets is specified, and make a second invocation
270 # of make so .config is not included in this case either (for *config).
272 version_h
:= include/generated
/uapi
/linux
/version.h
274 clean-targets
:= %clean mrproper cleandocs
275 no-dot-config-targets
:= $(clean-targets
) \
276 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
277 $(version_h
) headers headers_
% archheaders archscripts \
278 %asm-generic kernelversion
%src-pkg dt_binding_check \
279 outputmakefile rustavailable rustfmt rustfmtcheck
280 no-sync-config-targets
:= $(no-dot-config-targets
) %install modules_sign kernelrelease \
282 single-targets
:= %.a
%.i
%.ko
%.lds
%.ll
%.lst
%.mod
%.o
%.rsi
%.s
%.symtypes
%/
290 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
291 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
296 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
297 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
302 need-compiler
:= $(may-sync-config
)
304 ifneq ($(KBUILD_EXTMOD
),)
308 ifeq ($(KBUILD_EXTMOD
),)
309 ifneq ($(filter %config
,$(MAKECMDGOALS
)),)
311 ifneq ($(words $(MAKECMDGOALS
)),1)
317 # We cannot build single targets and the others at the same time
318 ifneq ($(filter $(single-targets
), $(MAKECMDGOALS
)),)
320 ifneq ($(filter-out $(single-targets
), $(MAKECMDGOALS
)),)
325 # For "make -j clean all", "make -j mrproper defconfig all", etc.
326 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
327 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
332 # install and modules_install need also be processed one by one
333 ifneq ($(filter install,$(MAKECMDGOALS
)),)
334 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
340 # ===========================================================================
341 # We're called with mixed targets (*config and build targets).
342 # Handle them one by one.
344 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
346 $(MAKECMDGOALS
): __build_one_by_one
351 for i in
$(MAKECMDGOALS
); do \
352 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
357 include $(srctree
)/scripts
/Kbuild.
include
359 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
360 KERNELRELEASE
= $(call read-file
, include/config
/kernel.release
)
361 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
362 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
364 include $(srctree
)/scripts
/subarch.
include
366 # Cross compiling and selecting different set of gcc/bin-utils
367 # ---------------------------------------------------------------------------
369 # When performing cross compilation for other architectures ARCH shall be set
370 # to the target architecture. (See arch/* for the possibilities).
371 # ARCH can be set during invocation of make:
373 # Another way is to have ARCH set in the environment.
374 # The default ARCH is the host where make is executed.
376 # CROSS_COMPILE specify the prefix used for all executables used
377 # during compilation. Only gcc and related bin-utils executables
378 # are prefixed with $(CROSS_COMPILE).
379 # CROSS_COMPILE can be set on the command line
380 # make CROSS_COMPILE=aarch64-linux-gnu-
381 # Alternatively CROSS_COMPILE can be set in the environment.
382 # Default value for CROSS_COMPILE is not to prefix executables
383 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
386 # Architecture as present in compile.h
387 UTS_MACHINE
:= $(ARCH
)
390 # Additional ARCH settings for x86
394 ifeq ($(ARCH
),x86_64
)
398 # Additional ARCH settings for sparc
399 ifeq ($(ARCH
),sparc32
)
402 ifeq ($(ARCH
),sparc64
)
406 # Additional ARCH settings for parisc
407 ifeq ($(ARCH
),parisc64
)
411 export cross_compiling
:=
412 ifneq ($(SRCARCH
),$(SUBARCH
))
416 KCONFIG_CONFIG ?
= .config
417 export KCONFIG_CONFIG
419 # SHELL used by kbuild
422 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
423 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
424 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
427 ifneq ($(filter %/,$(LLVM
)),)
428 LLVM_PREFIX
:= $(LLVM
)
429 else ifneq ($(filter -%,$(LLVM
)),)
430 LLVM_SUFFIX
:= $(LLVM
)
433 HOSTCC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
434 HOSTCXX
= $(LLVM_PREFIX
)clang
++$(LLVM_SUFFIX
)
440 HOSTPKG_CONFIG
= pkg-config
442 KBUILD_USERHOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes \
443 -O2
-fomit-frame-pointer
-std
=gnu11
444 KBUILD_USERCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(USERCFLAGS
)
445 KBUILD_USERLDFLAGS
:= $(USERLDFLAGS
)
447 # These flags apply to all Rust code in the tree, including the kernel and
449 export rust_common_flags
:= --edition
=2021 \
450 -Zbinary_dep_depinfo
=y \
451 -Dunsafe_op_in_unsafe_fn
-Drust_2018_idioms \
452 -Dunreachable_pub
-Dnon_ascii_idents \
454 -Drustdoc
::missing_crate_level_docs \
455 -Dclippy
::correctness
-Dclippy
::style \
456 -Dclippy
::suspicious
-Dclippy
::complexity \
458 -Dclippy
::let_unit_value
-Dclippy
::mut_mut \
459 -Dclippy
::needless_bitwise_bool \
460 -Dclippy
::needless_continue \
461 -Dclippy
::no_mangle_with_rust_abi \
464 KBUILD_HOSTCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(HOST_LFS_CFLAGS
) $(HOSTCFLAGS
)
465 KBUILD_HOSTCXXFLAGS
:= -Wall
-O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
466 KBUILD_HOSTRUSTFLAGS
:= $(rust_common_flags
) -O
-Cstrip
=debuginfo \
467 -Zallow-features
= $(HOSTRUSTFLAGS
)
468 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
469 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
471 # Make variables (CC, etc...)
474 CC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
475 LD
= $(LLVM_PREFIX
)ld.lld
$(LLVM_SUFFIX
)
476 AR
= $(LLVM_PREFIX
)llvm-ar
$(LLVM_SUFFIX
)
477 NM
= $(LLVM_PREFIX
)llvm-nm
$(LLVM_SUFFIX
)
478 OBJCOPY
= $(LLVM_PREFIX
)llvm-objcopy
$(LLVM_SUFFIX
)
479 OBJDUMP
= $(LLVM_PREFIX
)llvm-objdump
$(LLVM_SUFFIX
)
480 READELF
= $(LLVM_PREFIX
)llvm-readelf
$(LLVM_SUFFIX
)
481 STRIP
= $(LLVM_PREFIX
)llvm-strip
$(LLVM_SUFFIX
)
483 CC
= $(CROSS_COMPILE
)gcc
484 LD
= $(CROSS_COMPILE
)ld
485 AR
= $(CROSS_COMPILE
)ar
486 NM
= $(CROSS_COMPILE
)nm
487 OBJCOPY
= $(CROSS_COMPILE
)objcopy
488 OBJDUMP
= $(CROSS_COMPILE
)objdump
489 READELF
= $(CROSS_COMPILE
)readelf
490 STRIP
= $(CROSS_COMPILE
)strip
495 CLIPPY_DRIVER
= clippy-driver
499 RESOLVE_BTFIDS
= $(objtree
)/tools
/bpf
/resolve_btfids
/resolve_btfids
503 INSTALLKERNEL
:= installkernel
516 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
517 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
528 # Use USERINCLUDE when you must reference the UAPI directories only.
530 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
531 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
532 -I
$(srctree
)/include/uapi \
533 -I
$(objtree
)/include/generated
/uapi \
534 -include $(srctree
)/include/linux
/compiler-version.h \
535 -include $(srctree
)/include/linux
/kconfig.h
537 # Use LINUXINCLUDE when you must reference the include/ directory.
538 # Needed to be compatible with the O= option
540 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
541 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
542 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
543 -I
$(objtree
)/include \
546 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
549 KBUILD_CFLAGS
+= -std
=gnu11
550 KBUILD_CFLAGS
+= -fshort-wchar
551 KBUILD_CFLAGS
+= -funsigned-char
552 KBUILD_CFLAGS
+= -fno-common
553 KBUILD_CFLAGS
+= -fno-PIE
554 KBUILD_CFLAGS
+= -fno-strict-aliasing
556 KBUILD_CPPFLAGS
:= -D__KERNEL__
557 KBUILD_RUSTFLAGS
:= $(rust_common_flags
) \
558 --target
=$(objtree
)/scripts
/target.json \
559 -Cpanic
=abort
-Cembed-bitcode
=n
-Clto
=n \
560 -Cforce-unwind-tables
=n
-Ccodegen-units
=1 \
561 -Csymbol-mangling-version
=v0 \
562 -Crelocation-model
=static \
563 -Zfunction-sections
=n \
564 -Dclippy
::float_arithmetic
566 KBUILD_AFLAGS_KERNEL
:=
567 KBUILD_CFLAGS_KERNEL
:=
568 KBUILD_RUSTFLAGS_KERNEL
:=
569 KBUILD_AFLAGS_MODULE
:= -DMODULE
570 KBUILD_CFLAGS_MODULE
:= -DMODULE
571 KBUILD_RUSTFLAGS_MODULE
:= --cfg MODULE
572 KBUILD_LDFLAGS_MODULE
:=
576 ifeq ($(KBUILD_CLIPPY
),1)
577 RUSTC_OR_CLIPPY_QUIET
:= CLIPPY
578 RUSTC_OR_CLIPPY
= $(CLIPPY_DRIVER
)
580 RUSTC_OR_CLIPPY_QUIET
:= RUSTC
581 RUSTC_OR_CLIPPY
= $(RUSTC
)
588 # Allows the usage of unstable features in stable compilers.
589 export RUSTC_BOOTSTRAP
:= 1
591 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
592 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
593 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
594 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
595 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
596 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
597 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
598 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
600 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
601 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
602 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
603 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
604 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
605 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
607 # Files to ignore in find ... statements
609 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
610 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
612 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
613 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
615 # ===========================================================================
616 # Rules shared between *config targets and build targets
618 # Basic helpers built in scripts/basic/
619 PHONY
+= scripts_basic
621 $(Q
)$(MAKE
) $(build
)=scripts
/basic
623 PHONY
+= outputmakefile
624 ifdef building_out_of_srctree
625 # Before starting out-of-tree build, make sure the source tree is clean.
626 # outputmakefile generates a Makefile in the output directory, if using a
627 # separate output directory. This allows convenient use of make in the
629 # At the same time when output Makefile generated, generate .gitignore to
630 # ignore whole output directory
632 quiet_cmd_makefile
= GEN Makefile
634 echo
"\# Automatically generated by $(srctree)/Makefile: don't edit"; \
635 echo
"include $(srctree)/Makefile"; \
639 @if
[ -f
$(srctree
)/.config
-o \
640 -d
$(srctree
)/include/config
-o \
641 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
643 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
644 echo
>&2 "*** in $(abs_srctree)";\
648 $(Q
)ln
-fsn
$(srctree
) source
650 $(Q
)test -e .gitignore || \
651 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
654 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
655 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
656 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
657 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
658 CC_VERSION_TEXT
= $(subst $(pound
),,$(shell LC_ALL
=C
$(CC
) --version
2>/dev
/null | head
-n
1))
660 ifneq ($(findstring clang
,$(CC_VERSION_TEXT
)),)
661 include $(srctree
)/scripts
/Makefile.clang
664 # Include this also for config targets because some architectures need
665 # cc-cross-prefix to determine CROSS_COMPILE.
667 include $(srctree
)/scripts
/Makefile.compiler
671 # ===========================================================================
672 # *config targets only - make sure prerequisites are updated, and descend
673 # in scripts/kconfig to make the *config target
675 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
676 # KBUILD_DEFCONFIG may point out an alternative default configuration
677 # used for 'make defconfig'
678 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
679 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
681 config
: outputmakefile scripts_basic FORCE
682 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
684 %config
: outputmakefile scripts_basic FORCE
685 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
688 # ===========================================================================
689 # Build targets only - this includes vmlinux, arch-specific targets, clean
690 # targets and others. In general all targets except *config targets.
692 # If building an external module we do not care about the all: rule
693 # but instead __all depend on modules
695 ifeq ($(KBUILD_EXTMOD
),)
703 # Decide whether to build built-in, modular, or both.
704 # Normally, just do built-in.
709 # If we have only "make modules", don't compile built-in objects.
710 ifeq ($(MAKECMDGOALS
),modules
)
714 # If we have "make <whatever> modules", compile modules
715 # in addition to whatever we do anyway.
716 # Just "make" or "make all" shall build modules as well
718 ifneq ($(filter all modules nsdeps
%compile_commands.json clang-
%,$(MAKECMDGOALS
)),)
722 ifeq ($(MAKECMDGOALS
),)
726 export KBUILD_MODULES KBUILD_BUILTIN
729 include include/config
/auto.conf
732 ifeq ($(KBUILD_EXTMOD
),)
733 # Objects we will link into vmlinux / subdirs we need to visit
737 endif # KBUILD_EXTMOD
739 # The all: target is the default when no target is given on the
741 # This allow a user to issue only 'make' to build a kernel including modules
742 # Defaults to vmlinux, but the arch makefile usually adds further targets
745 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
746 ifdef CONFIG_CC_IS_GCC
747 CFLAGS_GCOV
+= -fno-tree-loop-im
751 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
752 ifdef CONFIG_FUNCTION_TRACER
753 CC_FLAGS_FTRACE
:= -pg
756 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
759 ifdef may-sync-config
760 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
761 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
762 # because some architectures define CROSS_COMPILE there.
763 include include/config
/auto.conf.cmd
767 @echo
>&2 '*** Configuration file "$@" not found!'
769 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
770 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
774 # The actual configuration files used during the build are stored in
775 # include/generated/ and include/config/. Update them if .config is newer than
776 # include/config/auto.conf (which mirrors .config).
778 # This exploits the 'multi-target pattern rule' trick.
779 # The syncconfig should be executed only once to make all the targets.
780 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
782 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
783 # so you cannot notice that Kconfig is waiting for the user input.
784 %/config
/auto.conf
%/config
/auto.conf.cmd
%/generated
/autoconf.h
%/generated
/rustc_cfg
: $(KCONFIG_CONFIG
)
785 $(Q
)$(kecho
) " SYNC $@"
786 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
787 else # !may-sync-config
788 # External modules and some install targets need include/generated/autoconf.h
789 # and include/config/auto.conf but do not care if they are up-to-date.
790 # Use auto.conf to trigger the test
791 PHONY
+= include/config
/auto.conf
793 include/config
/auto.conf
:
794 @
test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
796 echo
>&2 " ERROR: Kernel configuration is invalid."; \
797 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
798 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
802 endif # may-sync-config
805 KBUILD_CFLAGS
+= -fno-delete-null-pointer-checks
807 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
809 KBUILD_RUSTFLAGS
+= -Copt-level
=2
810 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
812 KBUILD_RUSTFLAGS
+= -Copt-level
=s
815 # Always set `debug-assertions` and `overflow-checks` because their default
816 # depends on `opt-level` and `debug-assertions`, respectively.
817 KBUILD_RUSTFLAGS
+= -Cdebug-assertions
=$(if
$(CONFIG_RUST_DEBUG_ASSERTIONS
),y
,n
)
818 KBUILD_RUSTFLAGS
+= -Coverflow-checks
=$(if
$(CONFIG_RUST_OVERFLOW_CHECKS
),y
,n
)
820 # Tell gcc to never replace conditional load with a non-conditional one
821 ifdef CONFIG_CC_IS_GCC
822 # gcc-10 renamed --param=allow-store-data-races=0 to
823 # -fno-allow-store-data-races.
824 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
825 KBUILD_CFLAGS
+= $(call cc-option
,-fno-allow-store-data-races
)
828 ifdef CONFIG_READABLE_ASM
829 # Disable optimizations that make assembler listings hard to read.
830 # reorder blocks reorders the control in the function
831 # ipa clone creates specialized cloned functions
832 # partial inlining inlines only parts of functions
833 KBUILD_CFLAGS
+= -fno-reorder-blocks
-fno-ipa-cp-clone
-fno-partial-inlining
836 stackp-flags-y
:= -fno-stack-protector
837 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
838 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
840 KBUILD_CFLAGS
+= $(stackp-flags-y
)
842 KBUILD_RUSTFLAGS-
$(CONFIG_WERROR
) += -Dwarnings
843 KBUILD_RUSTFLAGS
+= $(KBUILD_RUSTFLAGS-y
)
845 ifdef CONFIG_FRAME_POINTER
846 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
847 KBUILD_RUSTFLAGS
+= -Cforce-frame-pointers
=y
849 # Some targets (ARM with Thumb2, for example), can't be built with frame
850 # pointers. For those, we don't have FUNCTION_TRACER automatically
851 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
852 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
853 # -fomit-frame-pointer with FUNCTION_TRACER.
854 # In the Rust target specification, "frame-pointer" is set explicitly
856 ifndef CONFIG_FUNCTION_TRACER
857 KBUILD_CFLAGS
+= -fomit-frame-pointer
861 # Initialize all stack variables with a 0xAA pattern.
862 ifdef CONFIG_INIT_STACK_ALL_PATTERN
863 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
866 # Initialize all stack variables with a zero value.
867 ifdef CONFIG_INIT_STACK_ALL_ZERO
868 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=zero
869 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
870 # https://github.com/llvm/llvm-project/issues/44842
871 CC_AUTO_VAR_INIT_ZERO_ENABLER
:= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
872 export CC_AUTO_VAR_INIT_ZERO_ENABLER
873 KBUILD_CFLAGS
+= $(CC_AUTO_VAR_INIT_ZERO_ENABLER
)
877 # While VLAs have been removed, GCC produces unreachable stack probes
878 # for the randomize_kstack_offset feature. Disable it for all compilers.
879 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-clash-protection
)
881 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
882 ifdef CONFIG_ZERO_CALL_USED_REGS
883 KBUILD_CFLAGS
+= -fzero-call-used-regs
=used-gpr
886 ifdef CONFIG_FUNCTION_TRACER
887 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
888 CC_FLAGS_FTRACE
+= -mrecord-mcount
889 ifdef CONFIG_HAVE_NOP_MCOUNT
890 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
891 CC_FLAGS_FTRACE
+= -mnop-mcount
892 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
896 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
897 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
898 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
901 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
902 ifdef CONFIG_HAVE_C_RECORDMCOUNT
903 BUILD_C_RECORDMCOUNT
:= y
904 export BUILD_C_RECORDMCOUNT
907 ifdef CONFIG_HAVE_FENTRY
908 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
909 ifeq ($(call cc-option-yn
, -mfentry
),y
)
910 CC_FLAGS_FTRACE
+= -mfentry
911 CC_FLAGS_USING
+= -DCC_USING_FENTRY
914 export CC_FLAGS_FTRACE
915 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
916 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
919 # We trigger additional mismatches with less inlining
920 ifdef CONFIG_DEBUG_SECTION_MISMATCH
921 KBUILD_CFLAGS
+= -fno-inline-functions-called-once
924 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
925 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
926 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
927 KBUILD_RUSTFLAGS_KERNEL
+= -Zfunction-sections
=y
928 LDFLAGS_vmlinux
+= --gc-sections
931 ifdef CONFIG_SHADOW_CALL_STACK
932 ifndef CONFIG_DYNAMIC_SCS
933 CC_FLAGS_SCS
:= -fsanitize
=shadow-call-stack
934 KBUILD_CFLAGS
+= $(CC_FLAGS_SCS
)
939 ifdef CONFIG_LTO_CLANG
940 ifdef CONFIG_LTO_CLANG_THIN
941 CC_FLAGS_LTO
:= -flto
=thin
-fsplit-lto-unit
942 KBUILD_LDFLAGS
+= --thinlto-cache-dir
=$(extmod_prefix
).thinlto-cache
944 CC_FLAGS_LTO
:= -flto
946 CC_FLAGS_LTO
+= -fvisibility
=hidden
948 # Limit inlining across translation units to reduce binary size
949 KBUILD_LDFLAGS
+= -mllvm
-import-instr-limit
=5
951 # Check for frame size exceeding threshold during prolog/epilog insertion
952 # when using lld < 13.0.0.
953 ifneq ($(CONFIG_FRAME_WARN
),0)
954 ifeq ($(call test-lt
, $(CONFIG_LLD_VERSION
), 130000),y
)
955 KBUILD_LDFLAGS
+= -plugin-opt
=-warn-stack-size
=$(CONFIG_FRAME_WARN
)
961 KBUILD_CFLAGS
+= -fno-lto
$(CC_FLAGS_LTO
)
962 KBUILD_AFLAGS
+= -fno-lto
966 ifdef CONFIG_CFI_CLANG
967 CC_FLAGS_CFI
:= -fsanitize
=kcfi
968 KBUILD_CFLAGS
+= $(CC_FLAGS_CFI
)
972 ifneq ($(CONFIG_FUNCTION_ALIGNMENT
),0)
973 KBUILD_CFLAGS
+= -falign-functions
=$(CONFIG_FUNCTION_ALIGNMENT
)
976 # arch Makefile may override CC so keep this after arch Makefile is included
977 NOSTDINC_FLAGS
+= -nostdinc
979 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
980 # the kernel uses only C99 flexible arrays for dynamically sized trailing
981 # arrays. Enforce this for everything that may examine structure sizes and
982 # perform bounds checking.
983 KBUILD_CFLAGS
+= $(call cc-option
, -fstrict-flex-arrays
=3)
985 # disable invalid "can't wrap" optimizations for signed / pointers
986 KBUILD_CFLAGS
+= -fno-strict-overflow
988 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
989 KBUILD_CFLAGS
+= -fno-stack-check
991 # conserve stack if available
992 ifdef CONFIG_CC_IS_GCC
993 KBUILD_CFLAGS
+= -fconserve-stack
996 # change __FILE__ to the relative path from the srctree
997 KBUILD_CPPFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
999 # include additional Makefiles when needed
1000 include-y
:= scripts
/Makefile.extrawarn
1001 include-
$(CONFIG_DEBUG_INFO
) += scripts
/Makefile.debug
1002 include-
$(CONFIG_DEBUG_INFO_BTF
)+= scripts
/Makefile.btf
1003 include-
$(CONFIG_KASAN
) += scripts
/Makefile.kasan
1004 include-
$(CONFIG_KCSAN
) += scripts
/Makefile.kcsan
1005 include-
$(CONFIG_KMSAN
) += scripts
/Makefile.kmsan
1006 include-
$(CONFIG_UBSAN
) += scripts
/Makefile.ubsan
1007 include-
$(CONFIG_KCOV
) += scripts
/Makefile.kcov
1008 include-
$(CONFIG_RANDSTRUCT
) += scripts
/Makefile.randstruct
1009 include-
$(CONFIG_GCC_PLUGINS
) += scripts
/Makefile.gcc-plugins
1011 include $(addprefix $(srctree
)/, $(include-y
))
1013 # scripts/Makefile.gcc-plugins is intentionally included last.
1014 # Do not add $(call cc-option,...) below this line. When you build the kernel
1015 # from the clean source tree, the GCC plugins do not exist at this point.
1017 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1018 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
1019 KBUILD_AFLAGS
+= $(KAFLAGS
)
1020 KBUILD_CFLAGS
+= $(KCFLAGS
)
1021 KBUILD_RUSTFLAGS
+= $(KRUSTFLAGS
)
1023 KBUILD_LDFLAGS_MODULE
+= --build-id
=sha1
1024 LDFLAGS_vmlinux
+= --build-id
=sha1
1026 KBUILD_LDFLAGS
+= -z noexecstack
1027 ifeq ($(CONFIG_LD_IS_BFD
),y
)
1028 KBUILD_LDFLAGS
+= $(call ld-option
,--no-warn-rwx-segments
)
1031 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
1032 LDFLAGS_vmlinux
+= -X
1035 ifeq ($(CONFIG_RELR
),y
)
1036 # ld.lld before 15 did not support -z pack-relative-relocs.
1037 LDFLAGS_vmlinux
+= $(call ld-option
,--pack-dyn-relocs
=relr
,-z pack-relative-relocs
)
1040 # We never want expected sections to be placed heuristically by the
1041 # linker. All sections should be explicitly named in the linker script.
1042 ifdef CONFIG_LD_ORPHAN_WARN
1043 LDFLAGS_vmlinux
+= --orphan-handling
=$(CONFIG_LD_ORPHAN_WARN_LEVEL
)
1046 # Align the bit size of userspace programs with the kernel
1047 KBUILD_USERCFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1048 KBUILD_USERLDFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1050 # make the checker run with the right architecture
1051 CHECKFLAGS
+= --arch
=$(ARCH
)
1053 # insure the checker run with the right endianness
1054 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
1056 # the checker needs the correct machine size
1057 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
1059 # Default kernel image to build when no specific target is given.
1060 # KBUILD_IMAGE may be overruled on the command line or
1061 # set in the environment
1062 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1063 # this default value
1064 export KBUILD_IMAGE ?
= vmlinux
1067 # INSTALL_PATH specifies where to place the updated kernel and system map
1068 # images. Default is /boot, but you can set it to other values
1069 export INSTALL_PATH ?
= /boot
1072 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1073 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1074 # an argument if needed. Otherwise it defaults to the kernel install path
1076 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
1079 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1080 # relocations required by build roots. This is not defined in the
1081 # makefile but the argument can be passed to make if needed.
1084 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
1089 export extmod_prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
1090 export MODORDER
:= $(extmod_prefix
)modules.order
1091 export MODULES_NSDEPS
:= $(extmod_prefix
)modules.nsdeps
1093 ifeq ($(KBUILD_EXTMOD
),)
1096 clean-dirs
:= $(sort . Documentation \
1097 $(patsubst %/,%,$(filter %/, $(core-
) \
1098 $(drivers-
) $(libs-
))))
1100 export ARCH_CORE
:= $(core-y
)
1101 export ARCH_LIB
:= $(filter %/, $(libs-y
))
1102 export ARCH_DRIVERS
:= $(drivers-y
) $(drivers-m
)
1103 # Externally visible symbols (used by link-vmlinux.sh)
1105 KBUILD_VMLINUX_OBJS
:= .
/built-in.a
1106 ifdef CONFIG_MODULES
1107 KBUILD_VMLINUX_OBJS
+= $(patsubst %/, %/lib.a
, $(filter %/, $(libs-y
)))
1108 KBUILD_VMLINUX_LIBS
:= $(filter-out %/, $(libs-y
))
1110 KBUILD_VMLINUX_LIBS
:= $(patsubst %/,%/lib.a
, $(libs-y
))
1113 export KBUILD_VMLINUX_LIBS
1114 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1116 ifdef CONFIG_TRIM_UNUSED_KSYMS
1117 # For the kernel to actually contain only the needed exported symbols,
1118 # we have to build modules as well to determine what those symbols are.
1122 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1123 quiet_cmd_ar_vmlinux.a
= AR
$@
1124 cmd_ar_vmlinux.a
= \
1126 $(AR
) cDPrST
$@
$(KBUILD_VMLINUX_OBJS
); \
1127 $(AR
) mPiT
$$($(AR
) t
$@ | sed
-n
1p
) $@
$$($(AR
) t
$@ | grep
-F
-f
$(srctree
)/scripts
/head-object-list.txt
)
1129 targets
+= vmlinux.a
1130 vmlinux.a
: $(KBUILD_VMLINUX_OBJS
) scripts
/head-object-list.txt FORCE
1131 $(call if_changed
,ar_vmlinux.a
)
1134 vmlinux_o
: vmlinux.a
$(KBUILD_VMLINUX_LIBS
)
1135 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux_o
1137 vmlinux.o modules.builtin.modinfo modules.builtin
: vmlinux_o
1141 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1142 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1143 # unrelated; the decompressors just happen to have the same base name,
1144 # arch/*/boot/compressed/vmlinux.
1145 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1147 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1148 # https://savannah.gnu.org/bugs/?61463
1149 # For Make > 4.4, the following simple code will work:
1150 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1151 vmlinux
: private _LDFLAGS_vmlinux
:= $(LDFLAGS_vmlinux
)
1152 vmlinux
: export LDFLAGS_vmlinux
= $(_LDFLAGS_vmlinux
)
1153 vmlinux
: vmlinux.o
$(KBUILD_LDS
) modpost
1154 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux
1156 # The actual objects are generated when descending,
1157 # make sure no implicit rule kicks in
1158 $(sort $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)): .
;
1160 ifeq ($(origin KERNELRELEASE
),file
)
1161 filechk_kernel.release
= $(srctree
)/scripts
/setlocalversion
$(srctree
)
1163 filechk_kernel.release
= echo
$(KERNELRELEASE
)
1166 # Store (new) KERNELRELEASE string in include/config/kernel.release
1167 include/config
/kernel.release
: FORCE
1168 $(call filechk
,kernel.release
)
1170 # Additional helpers built in scripts/
1171 # Carefully list dependencies so we do not try to build scripts twice
1174 scripts
: scripts_basic scripts_dtc
1175 $(Q
)$(MAKE
) $(build
)=$(@
)
1177 # Things we need to do before we recursively start building the kernel
1178 # or the modules are listed in "prepare".
1179 # A multi level approach is used. prepareN is processed before prepareN-1.
1180 # archprepare is used in arch Makefiles and when processed asm symlink,
1181 # version.h and scripts_basic is processed / created.
1183 PHONY
+= prepare archprepare
1185 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1186 asm-generic
$(version_h
) include/generated
/utsrelease.h \
1187 include/generated
/compile.h
include/generated
/autoconf.h remove-stale-files
1189 prepare0
: archprepare
1190 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1191 $(Q
)$(MAKE
) $(build
)=. prepare
1193 # All the preparing..
1196 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
1197 $(Q
)$(MAKE
) $(build
)=rust
1200 PHONY
+= remove-stale-files
1202 $(Q
)$(srctree
)/scripts
/remove-stale-files
1204 # Support for using generic headers in asm-generic
1205 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1207 PHONY
+= asm-generic uapi-asm-generic
1208 asm-generic
: uapi-asm-generic
1209 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1210 generic
=include/asm-generic
1212 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1213 generic
=include/uapi
/asm-generic
1215 # Generate some files
1216 # ---------------------------------------------------------------------------
1218 # KERNELRELEASE can change from a few different places, meaning version.h
1219 # needs to be updated, so this check is forced on all builds
1222 define filechk_utsrelease.h
1223 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1224 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1227 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1230 define filechk_version.h
1231 if
[ $(SUBLEVEL
) -gt
255 ]; then \
1232 echo \
#define LINUX_VERSION_CODE $(shell \
1233 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + 255); \
1235 echo \
#define LINUX_VERSION_CODE $(shell \
1236 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
1238 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1239 ((c) > 255 ? 255 : (c)))'; \
1240 echo \
#define LINUX_VERSION_MAJOR $(VERSION); \
1241 echo \
#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1242 echo \
#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1245 $(version_h
): PATCHLEVEL
:= $(or
$(PATCHLEVEL
), 0)
1246 $(version_h
): SUBLEVEL
:= $(or
$(SUBLEVEL
), 0)
1248 $(call filechk
,version.h
)
1250 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1251 $(call filechk
,utsrelease.h
)
1253 filechk_compile.h
= $(srctree
)/scripts
/mkcompile_h \
1254 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1256 include/generated
/compile.h
: FORCE
1257 $(call filechk
,compile.h
)
1261 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1262 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1264 # ---------------------------------------------------------------------------
1267 #Default location for installed headers
1268 export INSTALL_HDR_PATH
= $(objtree
)/usr
1270 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1271 cmd_headers_install
= \
1272 mkdir
-p
$(INSTALL_HDR_PATH
); \
1273 rsync
-mrl
--include='*/' --include='*\.h' --exclude
='*' \
1274 usr
/include $(INSTALL_HDR_PATH
)
1276 PHONY
+= headers_install
1277 headers_install
: headers
1278 $(call cmd
,headers_install
)
1280 PHONY
+= archheaders archscripts
1282 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1285 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1286 $(if
$(filter um
, $(SRCARCH
)), $(error Headers not exportable for UML
))
1287 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1288 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1290 ifdef CONFIG_HEADERS_INSTALL
1294 PHONY
+= scripts_unifdef
1295 scripts_unifdef
: scripts_basic
1296 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1298 # ---------------------------------------------------------------------------
1301 # Many distributions have the custom install script, /sbin/installkernel.
1302 # If DKMS is installed, 'make install' will eventually recurse back
1303 # to this Makefile to build and install external modules.
1304 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1306 quiet_cmd_install
= INSTALL
$(INSTALL_PATH
)
1307 cmd_install
= unset sub_make_done
; $(srctree
)/scripts
/install.sh
1309 # ---------------------------------------------------------------------------
1312 PHONY
+= vdso_install
1313 vdso_install
: export INSTALL_FILES
= $(vdso-install-y
)
1315 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vdsoinst
1317 # ---------------------------------------------------------------------------
1320 ifdef CONFIG_OBJTOOL
1321 prepare
: tools
/objtool
1325 ifdef CONFIG_DEBUG_INFO_BTF
1326 prepare
: tools
/bpf
/resolve_btfids
1330 PHONY
+= resolve_btfids_clean
1332 resolve_btfids_O
= $(abspath
$(objtree
))/tools
/bpf
/resolve_btfids
1334 # tools/bpf/resolve_btfids directory might not exist
1335 # in output directory, skip its clean in that case
1336 resolve_btfids_clean
:
1337 ifneq ($(wildcard $(resolve_btfids_O
)),)
1338 $(Q
)$(MAKE
) -sC
$(srctree
)/tools
/bpf
/resolve_btfids O
=$(resolve_btfids_O
) clean
1341 # Clear a bunch of variables before executing the submake
1342 ifeq ($(quiet
),silent_
)
1347 $(Q
)mkdir
-p
$(objtree
)/tools
1348 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1351 $(Q
)mkdir
-p
$(objtree
)/tools
1352 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1354 # ---------------------------------------------------------------------------
1359 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1361 kselftest-
%: headers FORCE
1362 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1364 PHONY
+= kselftest-merge
1366 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1367 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config
-o
-name config.
$(UTS_MACHINE
) | \
1368 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-y
-m
$(objtree
)/.config
1369 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1371 # ---------------------------------------------------------------------------
1374 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1375 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1381 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1383 %.dtbo
: dtbs_prepare
1384 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1386 PHONY
+= dtbs dtbs_prepare dtbs_install dtbs_check
1388 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1390 # include/config/kernel.release is actually needed when installing DTBs because
1391 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1392 # dtbs_install depend on it as dtbs_install may run as root.
1393 dtbs_prepare
: include/config
/kernel.release scripts_dtc
1395 ifneq ($(filter dtbs_check
, $(MAKECMDGOALS
)),)
1399 ifneq ($(CHECK_DTBS
),)
1400 dtbs_prepare
: dt_binding_check
1406 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
) dst
=$(INSTALL_DTBS_PATH
)
1408 ifdef CONFIG_OF_EARLY_FLATTREE
1414 PHONY
+= scripts_dtc
1415 scripts_dtc
: scripts_basic
1416 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1418 ifneq ($(filter dt_binding_check
, $(MAKECMDGOALS
)),)
1419 export CHECK_DT_BINDING
=y
1422 PHONY
+= dt_binding_check
1423 dt_binding_check
: scripts_dtc
1424 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1426 PHONY
+= dt_compatible_check
1427 dt_compatible_check
: dt_binding_check
1428 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
$@
1430 # ---------------------------------------------------------------------------
1433 ifdef CONFIG_MODULES
1435 # By default, build modules as well
1439 # When we're building modules with modversions, we need to consider
1440 # the built-in objects during the descend as well, in order to
1441 # make sure the checksums are up to date before we record them.
1442 ifdef CONFIG_MODVERSIONS
1449 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1451 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1456 modules
: modules_prepare
1458 # Target to prepare building external modules
1459 modules_prepare
: prepare
1460 $(Q
)$(MAKE
) $(build
)=scripts scripts
/module.lds
1462 endif # CONFIG_MODULES
1465 # Cleaning is done on three levels.
1466 # make clean Delete most generated files
1467 # Leave enough to build external modules
1468 # make mrproper Delete the current configuration, and all generated files
1469 # make distclean Remove editor backup files, patch leftover files and the like
1471 # Directories & files removed with 'make clean'
1472 CLEAN_FILES
+= vmlinux.symvers modules-only.symvers \
1473 modules.builtin modules.builtin.modinfo modules.nsdeps \
1474 compile_commands.json .thinlto-cache rust
/test \
1475 rust-project.json .vmlinux.objs .vmlinux.
export.c
1477 # Directories & files removed with 'make mrproper'
1478 MRPROPER_FILES
+= include/config
include/generated \
1479 arch
/$(SRCARCH
)/include/generated .objdiff \
1480 debian snap tar-install \
1481 .config .config.old .version \
1483 certs
/signing_key.pem \
1489 # clean - Delete most, but leave enough to build external modules
1491 clean: rm-files
:= $(CLEAN_FILES
)
1493 PHONY
+= archclean vmlinuxclean
1496 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1497 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1499 clean: archclean vmlinuxclean resolve_btfids_clean
1501 # mrproper - Delete all generated files, including .config
1503 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1504 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1506 PHONY
+= $(mrproper-dirs
) mrproper
1508 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1510 mrproper
: clean $(mrproper-dirs
)
1512 @find .
$(RCS_FIND_IGNORE
) \
1513 \
( -name
'*.rmeta' \
) \
1514 -type f
-print | xargs
rm -f
1521 @find .
$(RCS_FIND_IGNORE
) \
1522 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1523 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1524 -o
-name
'core' -o
-name
tags -o
-name TAGS
-o
-name
'cscope*' \
1525 -o
-name GPATH
-o
-name GRTAGS
-o
-name GSYMS
-o
-name GTAGS \
) \
1526 -type f
-print | xargs
rm -f
1529 # Packaging of the kernel to various formats
1530 # ---------------------------------------------------------------------------
1533 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1534 %pkg
: include/config
/kernel.release FORCE
1535 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1537 # Brief documentation of the typical targets used
1538 # ---------------------------------------------------------------------------
1540 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1541 boards
:= $(sort $(notdir $(boards
)))
1542 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1543 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1547 @echo
'Cleaning targets:'
1548 @echo
' clean - Remove most generated files but keep the config and'
1549 @echo
' enough build support to build external modules'
1550 @echo
' mrproper - Remove all generated files + config + various backup files'
1551 @echo
' distclean - mrproper + remove editor backup and patch files'
1553 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1555 @echo
'Other generic targets:'
1556 @echo
' all - Build all targets marked with [*]'
1557 @echo
'* vmlinux - Build the bare kernel'
1558 @echo
'* modules - Build all modules'
1559 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1560 @echo
' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1561 @echo
' dir/ - Build all files in dir and below'
1562 @echo
' dir/file.[ois] - Build specified target only'
1563 @echo
' dir/file.ll - Build the LLVM assembly file'
1564 @echo
' (requires compiler support for LLVM assembly generation)'
1565 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1566 @echo
' (requires a recent binutils and recent build (System.map))'
1567 @echo
' dir/file.ko - Build module including final link'
1568 @echo
' modules_prepare - Set up for building external modules'
1569 @echo
' tags/TAGS - Generate tags file for editors'
1570 @echo
' cscope - Generate cscope index'
1571 @echo
' gtags - Generate GNU GLOBAL index'
1572 @echo
' kernelrelease - Output the release version string (use with make -s)'
1573 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1574 @echo
' image_name - Output the image name (use with make -s)'
1575 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1576 echo
' (default: $(INSTALL_HDR_PATH))'; \
1578 @echo
'Static analysers:'
1579 @echo
' checkstack - Generate a list of stack hogs'
1580 @echo
' versioncheck - Sanity check on version.h usage'
1581 @echo
' includecheck - Check for duplicate included header files'
1582 @echo
' export_report - List the usages of all exported symbols'
1583 @echo
' headerdep - Detect inclusion cycles in headers'
1584 @echo
' coccicheck - Check with Coccinelle'
1585 @echo
' clang-analyzer - Check with clang static analyzer'
1586 @echo
' clang-tidy - Check with clang-tidy'
1589 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1591 @echo
'Kernel selftest:'
1592 @echo
' kselftest - Build and run kernel selftest'
1593 @echo
' Build, install, and boot kernel before'
1594 @echo
' running kselftest on it'
1595 @echo
' Run as root for full coverage'
1596 @echo
' kselftest-all - Build kernel selftest'
1597 @echo
' kselftest-install - Build and install kernel selftest'
1598 @echo
' kselftest-clean - Remove all generated kselftest files'
1599 @echo
' kselftest-merge - Merge all the config dependencies of'
1600 @echo
' kselftest to existing .config.'
1602 @echo
'Rust targets:'
1603 @echo
' rustavailable - Checks whether the Rust toolchain is'
1604 @echo
' available and, if not, explains why.'
1605 @echo
' rustfmt - Reformat all the Rust code in the kernel'
1606 @echo
' rustfmtcheck - Checks if all the Rust code in the kernel'
1607 @echo
' is formatted, printing a diff otherwise.'
1608 @echo
' rustdoc - Generate Rust documentation'
1609 @echo
' (requires kernel .config)'
1610 @echo
' rusttest - Runs the Rust tests'
1611 @echo
' (requires kernel .config; downloads external repos)'
1612 @echo
' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1613 @echo
' (requires kernel .config)'
1614 @echo
' dir/file.[os] - Build specified target only'
1615 @echo
' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1616 @echo
' Run with RUSTFMT=n to skip reformatting if needed.'
1617 @echo
' The output is not intended to be compilable.'
1618 @echo
' dir/file.ll - Build the LLVM assembly file'
1621 echo
'Devicetree:'; \
1622 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1623 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1624 echo
' dt_binding_check - Validate device tree binding documents'; \
1625 echo
' dtbs_check - Validate device tree source files';\
1628 @echo
'Userspace tools targets:'
1629 @echo
' use "make tools/help"'
1630 @echo
' or "cd tools; make help"'
1632 @echo
'Kernel packaging:'
1633 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1635 @echo
'Documentation targets:'
1636 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1638 @echo
'Architecture-specific targets ($(SRCARCH)):'
1640 echo
' No architecture-specific help defined for $(SRCARCH)')
1643 $(foreach b
, $(boards
), \
1644 printf
" %-27s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1646 @
$(if
$(board-dirs
), \
1647 $(foreach b
, $(board-dirs
), \
1648 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1649 printf
" %-16s - Show all of the above\\n" help-boards
; \
1652 @echo
' make V=n [targets] 1: verbose build'
1653 @echo
' 2: give reason for rebuild of target'
1654 @echo
' V=1 and V=2 can be combined with V=12'
1655 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1656 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK'
1657 @echo
' (sparse by default)'
1658 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1659 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1660 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1661 @echo
' 1: warnings which may be relevant and do not occur too often'
1662 @echo
' 2: warnings which occur quite often but may still be relevant'
1663 @echo
' 3: more obscure warnings, can most likely be ignored'
1664 @echo
' e: warnings are being treated as errors'
1665 @echo
' Multiple levels can be combined with W=12 or W=123'
1667 echo
' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1668 echo
' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1671 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1672 @echo
'For further info see the ./README file'
1675 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1677 help-boards
: $(help-board-dirs
)
1679 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1681 $(help-board-dirs
): help-
%:
1682 @echo
'Architecture-specific targets ($(SRCARCH) $*):'
1683 @
$(if
$(boards-per-dir
), \
1684 $(foreach b
, $(boards-per-dir
), \
1685 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1689 # Documentation targets
1690 # ---------------------------------------------------------------------------
1691 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1692 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1693 PHONY
+= $(DOC_TARGETS
)
1695 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1699 # ---------------------------------------------------------------------------
1701 # "Is Rust available?" target
1702 PHONY
+= rustavailable
1704 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
&& echo
"Rust is available!"
1706 # Documentation target
1708 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1711 $(Q
)$(MAKE
) $(build
)=rust
$@
1716 $(Q
)$(MAKE
) $(build
)=rust
$@
1718 # Formatting targets
1719 PHONY
+= rustfmt rustfmtcheck
1721 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1723 # We match using absolute paths since `find` does not resolve them
1724 # when matching, which is a problem when e.g. `srctree` is `..`.
1725 # We `grep` afterwards in order to remove the directory entry itself.
1727 $(Q
)find
$(abs_srctree
) -type f
-name
'*.rs' \
1728 -o
-path
$(abs_srctree
)/rust
/alloc
-prune \
1729 -o
-path
$(abs_objtree
)/rust
/test -prune \
1730 | grep
-Fv
$(abs_srctree
)/rust
/alloc \
1731 | grep
-Fv
$(abs_objtree
)/rust
/test \
1732 | grep
-Fv generated \
1733 | xargs
$(RUSTFMT
) $(rustfmt_flags
)
1735 rustfmtcheck
: rustfmt_flags
= --check
1736 rustfmtcheck
: rustfmt
1739 # ---------------------------------------------------------------------------
1743 $(Q
)$(srctree
)/scripts
/misc-check
1747 PHONY
+= scripts_gdb
1748 scripts_gdb
: prepare0
1749 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1750 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1752 ifdef CONFIG_GDB_SCRIPTS
1756 else # KBUILD_EXTMOD
1758 filechk_kernel.release
= echo
$(KERNELRELEASE
)
1761 # External module support.
1762 # When building external modules the kernel used as basis is considered
1763 # read-only, and no consistency checks are made and the make
1764 # system is not used on the basis kernel. If updates are required
1765 # in the basis kernel ordinary make commands (without M=...) must be used.
1767 # We are always building only modules.
1771 build-dir
:= $(KBUILD_EXTMOD
)
1773 compile_commands.json
: $(extmod_prefix
)compile_commands.json
1774 PHONY
+= compile_commands.json
1776 clean-dirs
:= $(KBUILD_EXTMOD
)
1777 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
$(KBUILD_EXTMOD
)/modules.nsdeps \
1778 $(KBUILD_EXTMOD
)/compile_commands.json
$(KBUILD_EXTMOD
)/.thinlto-cache
1781 # now expand this into a simple variable to reduce the cost of shell evaluations
1782 prepare
: CC_VERSION_TEXT
:= $(CC_VERSION_TEXT
)
1784 @if
[ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1785 echo
>&2 "warning: the compiler differs from the one used to build the kernel"; \
1786 echo
>&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1787 echo
>&2 " You are using: $(CC_VERSION_TEXT)"; \
1792 @echo
' Building external modules.'
1793 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1795 @echo
' modules - default target, build the module(s)'
1796 @echo
' modules_install - install the module'
1797 @echo
' clean - remove generated files in module directory only'
1798 @echo
' rust-analyzer - generate rust-project.json rust-analyzer support file'
1801 ifndef CONFIG_MODULES
1802 modules modules_install
: __external_modules_error
1803 __external_modules_error
:
1805 @echo
>&2 '*** The present kernel disabled CONFIG_MODULES.'
1806 @echo
>&2 '*** You cannot build or install external modules.'
1811 endif # KBUILD_EXTMOD
1813 # ---------------------------------------------------------------------------
1816 PHONY
+= modules modules_install modules_sign modules_prepare
1819 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst \
1820 sign-only
=$(if
$(filter modules_install
,$(MAKECMDGOALS
)),,y
)
1822 ifeq ($(CONFIG_MODULE_SIG
),y
)
1823 # modules_sign is a subset of modules_install.
1824 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1825 modules_sign
: modules_install
1830 @echo
>&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1835 ifdef CONFIG_MODULES
1837 $(MODORDER
): $(build-dir
)
1840 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1841 # This is solely useful to speed up test compiles.
1843 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
1844 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
1847 PHONY
+= modules_check
1848 modules_check
: $(MODORDER
)
1849 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
$<
1851 else # CONFIG_MODULES
1858 endif # CONFIG_MODULES
1861 modpost
: $(if
$(single-build
),, $(if
$(KBUILD_BUILTIN
), vmlinux.o
)) \
1862 $(if
$(KBUILD_MODULES
), modules_check
)
1863 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1866 # ---------------------------------------------------------------------------
1867 # To build individual files in subdirectories, you can do like this:
1869 # make foo/bar/baz.s
1871 # The supported suffixes for single-target are listed in 'single-targets'
1873 # To build only under specific subdirectories, you can do like this:
1879 # .ko is special because modpost is needed
1880 single-ko
:= $(sort $(filter %.ko
, $(MAKECMDGOALS
)))
1881 single-no-ko
:= $(filter-out $(single-ko
), $(MAKECMDGOALS
)) \
1882 $(foreach x
, o mod
, $(patsubst %.ko
, %.
$x, $(single-ko
)))
1884 $(single-ko
): single_modules
1886 $(single-no-ko
): $(build-dir
)
1889 # Remove MODORDER when done because it is not the real one.
1890 PHONY
+= single_modules
1891 single_modules
: $(single-no-ko
) modules_prepare
1892 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod_prefix
)$(m
:%.ko
=%.o
);) } > $(MODORDER
)
1893 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1894 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
1895 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
1897 $(Q
)rm -f
$(MODORDER
)
1899 single-goals
:= $(addprefix $(build-dir
)/, $(single-no-ko
))
1905 # Preset locale variables to speed up the build process. Limit locale
1906 # tweaks to this spot to avoid wrong language settings when running
1907 # make menuconfig etc.
1908 # Error messages still appears in the original language
1909 PHONY
+= $(build-dir
)
1910 $(build-dir
): prepare
1911 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1 need-modorder
=1 $(single-goals
)
1913 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
1914 PHONY
+= $(clean-dirs
) clean
1916 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1918 clean: $(clean-dirs
)
1920 @find
$(or
$(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1921 \
( -name
'*.[aios]' -o
-name
'*.rsi' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1923 -o
-name
'*.dtb' -o
-name
'*.dtbo' \
1924 -o
-name
'*.dtb.S' -o
-name
'*.dtbo.S' \
1925 -o
-name
'*.dt.yaml' \
1926 -o
-name
'*.dwo' -o
-name
'*.lst' \
1927 -o
-name
'*.su' -o
-name
'*.mod' \
1928 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1929 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1930 -o
-name
'*.asn1.[ch]' \
1931 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1932 -o
-name
'*.c.[012]*.*' \
1935 -o
-name
'*.*.symversions' \
) -type f
-print \
1936 -o
-name
'.tmp_*' -print \
1939 # Generate tags for editors
1940 # ---------------------------------------------------------------------------
1941 quiet_cmd_tags
= GEN
$@
1942 cmd_tags
= $(BASH
) $(srctree
)/scripts
/tags.sh
$@
1944 tags TAGS cscope gtags
: FORCE
1947 # IDE support targets
1948 PHONY
+= rust-analyzer
1950 $(Q
)$(MAKE
) $(build
)=rust
$@
1952 # Script to generate missing namespace dependencies
1953 # ---------------------------------------------------------------------------
1956 nsdeps
: export KBUILD_NSDEPS
=1
1958 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/nsdeps
1961 # ---------------------------------------------------------------------------
1963 quiet_cmd_gen_compile_commands
= GEN
$@
1964 cmd_gen_compile_commands
= $(PYTHON3
) $< -a
$(AR
) -o
$@
$(filter-out $<, $(real-prereqs
))
1966 $(extmod_prefix
)compile_commands.json
: scripts
/clang-tools
/gen_compile_commands.py \
1967 $(if
$(KBUILD_EXTMOD
),, vmlinux.a
$(KBUILD_VMLINUX_LIBS
)) \
1968 $(if
$(CONFIG_MODULES
), $(MODORDER
)) FORCE
1969 $(call if_changed
,gen_compile_commands
)
1971 targets
+= $(extmod_prefix
)compile_commands.json
1973 PHONY
+= clang-tidy clang-analyzer
1975 ifdef CONFIG_CC_IS_CLANG
1976 quiet_cmd_clang_tools
= CHECK
$<
1977 cmd_clang_tools
= $(PYTHON3
) $(srctree
)/scripts
/clang-tools
/run-clang-tools.py
$@
$<
1979 clang-tidy clang-analyzer
: $(extmod_prefix
)compile_commands.json
1980 $(call cmd
,clang_tools
)
1982 clang-tidy clang-analyzer
:
1983 @echo
"$@ requires CC=clang" >&2
1987 # Scripts to check various things for consistency
1988 # ---------------------------------------------------------------------------
1990 PHONY
+= includecheck versioncheck coccicheck export_report
1993 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1994 -name
'*.[hcS]' -type f
-print |
sort \
1995 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1998 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1999 -name
'*.[hcS]' -type f
-print |
sort \
2000 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
2003 $(Q
)$(BASH
) $(srctree
)/scripts
/$@
2006 $(PERL
) $(srctree
)/scripts
/export_report.pl
2008 PHONY
+= checkstack kernelrelease kernelversion image_name
2010 # UML needs a little special treatment here. It wants to use the host
2011 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2012 # else wants $(ARCH), including people doing cross-builds, which means
2013 # that $(SUBARCH) doesn't work here.
2015 CHECKSTACK_ARCH
:= $(SUBARCH
)
2017 CHECKSTACK_ARCH
:= $(ARCH
)
2020 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
2021 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
2024 @
$(filechk_kernel.release
)
2027 @echo
$(KERNELVERSION
)
2030 @echo
$(KBUILD_IMAGE
)
2032 PHONY
+= run-command
2034 $(Q
)$(KBUILD_RUN_COMMAND
)
2036 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
2037 cmd_rmfiles
= rm -rf
$(rm-files
)
2039 # read saved command lines for existing targets
2040 existing-targets
:= $(wildcard $(sort $(targets
)))
2042 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
2044 endif # config-build
2046 endif # need-sub-make
2051 # Declare the contents of the PHONY variable as phony. We keep that
2052 # information in a variable so we can use it in if_changed and friends.