1 # SPDX-License-Identifier: GPL-2.0
6 NAME
= Hurr durr I
'ma ninja sloth
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 ifeq ($(filter undefine,$(.FEATURES)),)
15 $(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION))
18 $(if $(filter __%, $(MAKECMDGOALS)), \
19 $(error targets prefixed with '__
' are only for internal use))
21 # That's our default target when none is given on the command line
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.a targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 this-makefile
:= $(lastword
$(MAKEFILE_LIST
))
42 export abs_srctree
:= $(realpath
$(dir $(this-makefile
)))
43 export abs_objtree
:= $(CURDIR
)
45 ifneq ($(sub_make_done
),1)
47 # Do not use make's built-in rules and variables
48 # (this increases performance and avoids hard-to-debug behaviour)
51 # Avoid funny character set dependencies
55 export LC_COLLATE LC_NUMERIC
57 # Avoid interference with shell env settings
61 # ---------------------------------------------------------------------------
63 # Most of build commands in Kbuild start with "cmd_". You can optionally define
64 # "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
65 # that command is printed by default.
68 # quiet_cmd_depmod = DEPMOD $(MODLIB)
69 # cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
71 # A simple variant is to prefix commands with $(Q) - that's useful
72 # for commands that shall be hidden in non-verbose mode.
74 # $(Q)$(MAKE) $(build)=scripts/basic
76 # If KBUILD_VERBOSE contains 1, the whole command is echoed.
77 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
79 # To put more focus on warnings, be less verbose as default
80 # Use 'make V=1' to see the full commands
82 ifeq ("$(origin V)", "command line")
89 ifneq ($(findstring 1, $(KBUILD_VERBOSE
)),)
94 # If the user is running make -s (silent mode), suppress echoing of
96 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
98 ifeq ($(filter 3.
%,$(MAKE_VERSION
)),)
99 short-opts
:= $(firstword -$(MAKEFLAGS
))
101 short-opts
:= $(filter-out --%,$(MAKEFLAGS
))
104 ifneq ($(findstring s
,$(short-opts
)),)
106 override KBUILD_VERBOSE
:=
109 export quiet Q KBUILD_VERBOSE
111 # Call a source code checker (by default, "sparse") as part of the
114 # Use 'make C=1' to enable checking of only re-compiled files.
115 # Use 'make C=2' to enable checking of *all* source files, regardless
116 # of whether they are re-compiled or not.
118 # See the file "Documentation/dev-tools/sparse.rst" for more details,
119 # including where to get the "sparse" utility.
121 ifeq ("$(origin C)", "command line")
122 KBUILD_CHECKSRC
= $(C
)
124 ifndef KBUILD_CHECKSRC
128 export KBUILD_CHECKSRC
130 # Enable "clippy" (a linter) as part of the Rust compilation.
132 # Use 'make CLIPPY=1' to enable it.
133 ifeq ("$(origin CLIPPY)", "command line")
134 KBUILD_CLIPPY
:= $(CLIPPY
)
139 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
140 # directory of external module to build. Setting M= takes precedence.
141 ifeq ("$(origin M)", "command line")
142 KBUILD_EXTMOD
:= $(M
)
145 $(if
$(word 2, $(KBUILD_EXTMOD
)), \
146 $(error building multiple external modules is not supported
))
148 $(foreach x
, % :, $(if
$(findstring $x, $(KBUILD_EXTMOD
)), \
149 $(error module directory path cannot contain
'$x')))
151 # Remove trailing slashes
152 ifneq ($(filter %/, $(KBUILD_EXTMOD
)),)
153 KBUILD_EXTMOD
:= $(shell dirname
$(KBUILD_EXTMOD
).
)
158 # Kbuild will save output files in the current working directory.
159 # This does not need to match to the root of the kernel source tree.
161 # For example, you can do this:
163 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
165 # If you want to save output files in a different location, there are
166 # two syntaxes to specify it.
169 # Use "make O=dir/to/store/output/files/"
171 # 2) Set KBUILD_OUTPUT
172 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
173 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
175 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
178 # Do we want to change the working directory?
179 ifeq ("$(origin O)", "command line")
180 KBUILD_OUTPUT
:= $(O
)
183 ifneq ($(KBUILD_OUTPUT
),)
184 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
185 # expand a shell special character '~'. We use a somewhat tedious way here.
186 abs_objtree
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) && pwd
)
187 $(if
$(abs_objtree
),, \
188 $(error failed to create output directory
"$(KBUILD_OUTPUT)"))
190 # $(realpath ...) resolves symlinks
191 abs_objtree
:= $(realpath
$(abs_objtree
))
192 endif # ifneq ($(KBUILD_OUTPUT),)
194 ifneq ($(words $(subst :, ,$(abs_srctree
))), 1)
195 $(error source directory cannot contain spaces or colons
)
198 ifneq ($(filter 3.
%,$(MAKE_VERSION
)),)
199 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
200 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
202 # Cancel implicit rules for this Makefile.
206 export sub_make_done
:= 1
208 endif # sub_make_done
210 ifeq ($(abs_objtree
),$(CURDIR
))
211 # Suppress "Entering directory ..." if we are at the final work directory.
212 no-print-directory
:= --no-print-directory
214 # Recursion to show "Entering directory ..."
218 ifeq ($(filter --no-print-directory
, $(MAKEFLAGS
)),)
219 # If --no-print-directory is unset, recurse once again to set it.
220 # You may end up recursing into __sub-make twice. This is needed due to the
221 # behavior change in GNU Make 4.4.1.
225 ifeq ($(need-sub-make
),1)
227 PHONY
+= $(MAKECMDGOALS
) __sub-make
229 $(filter-out $(this-makefile
), $(MAKECMDGOALS
)) __all
: __sub-make
232 # Invoke a second make in the output directory, passing relevant variables
234 $(Q
)$(MAKE
) $(no-print-directory
) -C
$(abs_objtree
) \
235 -f
$(abs_srctree
)/Makefile
$(MAKECMDGOALS
)
239 # We process the rest of the Makefile if this is the final invocation of make
241 ifeq ($(abs_srctree
),$(abs_objtree
))
242 # building in the source tree
244 building_out_of_srctree
:=
246 ifeq ($(abs_srctree
)/,$(dir $(abs_objtree
)))
247 # building in a subdirectory of the source tree
250 srctree
:= $(abs_srctree
)
252 building_out_of_srctree
:= 1
255 ifneq ($(KBUILD_ABS_SRCTREE
),)
256 srctree
:= $(abs_srctree
)
262 export building_out_of_srctree srctree objtree VPATH
264 # To make sure we do not include .config for any of the *config targets
265 # catch them early, and hand them over to scripts/kconfig/Makefile
266 # It is allowed to specify more targets when calling make, including
267 # mixing *config targets and build targets.
268 # For example 'make oldconfig all'.
269 # Detect when mixed targets is specified, and make a second invocation
270 # of make so .config is not included in this case either (for *config).
272 version_h
:= include/generated
/uapi
/linux
/version.h
274 clean-targets
:= %clean mrproper cleandocs
275 no-dot-config-targets
:= $(clean-targets
) \
276 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
277 $(version_h
) headers headers_
% archheaders archscripts \
278 %asm-generic kernelversion
%src-pkg dt_binding_check \
279 outputmakefile rustavailable rustfmt rustfmtcheck
280 # Installation targets should not require compiler. Unfortunately, vdso_install
281 # is an exception where build artifacts may be updated. This must be fixed.
282 no-compiler-targets
:= $(no-dot-config-targets
) install dtbs_install \
283 headers_install modules_install modules_sign kernelrelease image_name
284 no-sync-config-targets
:= $(no-dot-config-targets
) %install modules_sign kernelrelease \
286 single-targets
:= %.a
%.i
%.ko
%.lds
%.ll
%.lst
%.mod
%.o
%.rsi
%.s
%.symtypes
%/
295 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
296 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
301 ifneq ($(filter $(no-compiler-targets
), $(MAKECMDGOALS
)),)
302 ifeq ($(filter-out $(no-compiler-targets
), $(MAKECMDGOALS
)),)
307 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
308 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
313 ifneq ($(KBUILD_EXTMOD
),)
317 ifeq ($(KBUILD_EXTMOD
),)
318 ifneq ($(filter %config
,$(MAKECMDGOALS
)),)
320 ifneq ($(words $(MAKECMDGOALS
)),1)
326 # We cannot build single targets and the others at the same time
327 ifneq ($(filter $(single-targets
), $(MAKECMDGOALS
)),)
329 ifneq ($(filter-out $(single-targets
), $(MAKECMDGOALS
)),)
334 # For "make -j clean all", "make -j mrproper defconfig all", etc.
335 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
336 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
341 # install and modules_install need also be processed one by one
342 ifneq ($(filter install,$(MAKECMDGOALS
)),)
343 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
349 # ===========================================================================
350 # We're called with mixed targets (*config and build targets).
351 # Handle them one by one.
353 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
355 $(MAKECMDGOALS
): __build_one_by_one
360 for i in
$(MAKECMDGOALS
); do \
361 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
366 include $(srctree
)/scripts
/Kbuild.
include
368 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
369 KERNELRELEASE
= $(call read-file
, include/config
/kernel.release
)
370 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
371 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
373 include $(srctree
)/scripts
/subarch.
include
375 # Cross compiling and selecting different set of gcc/bin-utils
376 # ---------------------------------------------------------------------------
378 # When performing cross compilation for other architectures ARCH shall be set
379 # to the target architecture. (See arch/* for the possibilities).
380 # ARCH can be set during invocation of make:
382 # Another way is to have ARCH set in the environment.
383 # The default ARCH is the host where make is executed.
385 # CROSS_COMPILE specify the prefix used for all executables used
386 # during compilation. Only gcc and related bin-utils executables
387 # are prefixed with $(CROSS_COMPILE).
388 # CROSS_COMPILE can be set on the command line
389 # make CROSS_COMPILE=ia64-linux-
390 # Alternatively CROSS_COMPILE can be set in the environment.
391 # Default value for CROSS_COMPILE is not to prefix executables
392 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
395 # Architecture as present in compile.h
396 UTS_MACHINE
:= $(ARCH
)
399 # Additional ARCH settings for x86
403 ifeq ($(ARCH
),x86_64
)
407 # Additional ARCH settings for sparc
408 ifeq ($(ARCH
),sparc32
)
411 ifeq ($(ARCH
),sparc64
)
415 # Additional ARCH settings for parisc
416 ifeq ($(ARCH
),parisc64
)
420 export cross_compiling
:=
421 ifneq ($(SRCARCH
),$(SUBARCH
))
425 KCONFIG_CONFIG ?
= .config
426 export KCONFIG_CONFIG
428 # SHELL used by kbuild
431 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
432 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
433 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
436 ifneq ($(filter %/,$(LLVM
)),)
437 LLVM_PREFIX
:= $(LLVM
)
438 else ifneq ($(filter -%,$(LLVM
)),)
439 LLVM_SUFFIX
:= $(LLVM
)
442 HOSTCC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
443 HOSTCXX
= $(LLVM_PREFIX
)clang
++$(LLVM_SUFFIX
)
449 HOSTPKG_CONFIG
= pkg-config
451 KBUILD_USERHOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes \
452 -O2
-fomit-frame-pointer
-std
=gnu11
453 KBUILD_USERCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(USERCFLAGS
)
454 KBUILD_USERLDFLAGS
:= $(USERLDFLAGS
)
456 # These flags apply to all Rust code in the tree, including the kernel and
458 export rust_common_flags
:= --edition
=2021 \
459 -Zbinary_dep_depinfo
=y \
460 -Dunsafe_op_in_unsafe_fn
-Drust_2018_idioms \
461 -Dunreachable_pub
-Dnon_ascii_idents \
463 -Drustdoc
::missing_crate_level_docs \
464 -Dclippy
::correctness
-Dclippy
::style \
465 -Dclippy
::suspicious
-Dclippy
::complexity \
467 -Dclippy
::let_unit_value
-Dclippy
::mut_mut \
468 -Dclippy
::needless_bitwise_bool \
469 -Dclippy
::needless_continue \
470 -Dclippy
::no_mangle_with_rust_abi \
473 KBUILD_HOSTCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(HOST_LFS_CFLAGS
) $(HOSTCFLAGS
)
474 KBUILD_HOSTCXXFLAGS
:= -Wall
-O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
475 KBUILD_HOSTRUSTFLAGS
:= $(rust_common_flags
) -O
-Cstrip
=debuginfo \
476 -Zallow-features
= $(HOSTRUSTFLAGS
)
477 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
478 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
480 # Make variables (CC, etc...)
483 CC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
484 LD
= $(LLVM_PREFIX
)ld.lld
$(LLVM_SUFFIX
)
485 AR
= $(LLVM_PREFIX
)llvm-ar
$(LLVM_SUFFIX
)
486 NM
= $(LLVM_PREFIX
)llvm-nm
$(LLVM_SUFFIX
)
487 OBJCOPY
= $(LLVM_PREFIX
)llvm-objcopy
$(LLVM_SUFFIX
)
488 OBJDUMP
= $(LLVM_PREFIX
)llvm-objdump
$(LLVM_SUFFIX
)
489 READELF
= $(LLVM_PREFIX
)llvm-readelf
$(LLVM_SUFFIX
)
490 STRIP
= $(LLVM_PREFIX
)llvm-strip
$(LLVM_SUFFIX
)
492 CC
= $(CROSS_COMPILE
)gcc
493 LD
= $(CROSS_COMPILE
)ld
494 AR
= $(CROSS_COMPILE
)ar
495 NM
= $(CROSS_COMPILE
)nm
496 OBJCOPY
= $(CROSS_COMPILE
)objcopy
497 OBJDUMP
= $(CROSS_COMPILE
)objdump
498 READELF
= $(CROSS_COMPILE
)readelf
499 STRIP
= $(CROSS_COMPILE
)strip
504 CLIPPY_DRIVER
= clippy-driver
508 RESOLVE_BTFIDS
= $(objtree
)/tools
/bpf
/resolve_btfids
/resolve_btfids
512 INSTALLKERNEL
:= installkernel
525 PAHOLE_FLAGS
= $(shell PAHOLE
=$(PAHOLE
) $(srctree
)/scripts
/pahole-flags.sh
)
527 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
528 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
539 # Use USERINCLUDE when you must reference the UAPI directories only.
541 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
542 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
543 -I
$(srctree
)/include/uapi \
544 -I
$(objtree
)/include/generated
/uapi \
545 -include $(srctree
)/include/linux
/compiler-version.h \
546 -include $(srctree
)/include/linux
/kconfig.h
548 # Use LINUXINCLUDE when you must reference the include/ directory.
549 # Needed to be compatible with the O= option
551 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
552 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
553 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
554 -I
$(objtree
)/include \
557 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
560 KBUILD_CFLAGS
+= -std
=gnu11
561 KBUILD_CFLAGS
+= -fshort-wchar
562 KBUILD_CFLAGS
+= -funsigned-char
563 KBUILD_CFLAGS
+= -fno-common
564 KBUILD_CFLAGS
+= -fno-PIE
565 KBUILD_CFLAGS
+= -fno-strict-aliasing
567 KBUILD_CPPFLAGS
:= -D__KERNEL__
568 KBUILD_RUSTFLAGS
:= $(rust_common_flags
) \
569 --target
=$(objtree
)/scripts
/target.json \
570 -Cpanic
=abort
-Cembed-bitcode
=n
-Clto
=n \
571 -Cforce-unwind-tables
=n
-Ccodegen-units
=1 \
572 -Csymbol-mangling-version
=v0 \
573 -Crelocation-model
=static \
574 -Zfunction-sections
=n \
575 -Dclippy
::float_arithmetic
577 KBUILD_AFLAGS_KERNEL
:=
578 KBUILD_CFLAGS_KERNEL
:=
579 KBUILD_RUSTFLAGS_KERNEL
:=
580 KBUILD_AFLAGS_MODULE
:= -DMODULE
581 KBUILD_CFLAGS_MODULE
:= -DMODULE
582 KBUILD_RUSTFLAGS_MODULE
:= --cfg MODULE
583 KBUILD_LDFLAGS_MODULE
:=
587 ifeq ($(KBUILD_CLIPPY
),1)
588 RUSTC_OR_CLIPPY_QUIET
:= CLIPPY
589 RUSTC_OR_CLIPPY
= $(CLIPPY_DRIVER
)
591 RUSTC_OR_CLIPPY_QUIET
:= RUSTC
592 RUSTC_OR_CLIPPY
= $(RUSTC
)
599 # Allows the usage of unstable features in stable compilers.
600 export RUSTC_BOOTSTRAP
:= 1
602 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
603 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
604 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
605 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
606 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
607 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
608 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
609 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
611 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
612 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
613 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
614 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
615 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
616 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
619 # Files to ignore in find ... statements
621 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
622 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
624 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
625 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
627 # ===========================================================================
628 # Rules shared between *config targets and build targets
630 # Basic helpers built in scripts/basic/
631 PHONY
+= scripts_basic
633 $(Q
)$(MAKE
) $(build
)=scripts
/basic
635 PHONY
+= outputmakefile
636 ifdef building_out_of_srctree
637 # Before starting out-of-tree build, make sure the source tree is clean.
638 # outputmakefile generates a Makefile in the output directory, if using a
639 # separate output directory. This allows convenient use of make in the
641 # At the same time when output Makefile generated, generate .gitignore to
642 # ignore whole output directory
644 quiet_cmd_makefile
= GEN Makefile
646 echo
"\# Automatically generated by $(srctree)/Makefile: don't edit"; \
647 echo
"include $(srctree)/Makefile"; \
651 @if
[ -f
$(srctree
)/.config
-o \
652 -d
$(srctree
)/include/config
-o \
653 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
655 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
656 echo
>&2 "*** in $(abs_srctree)";\
660 $(Q
)ln
-fsn
$(srctree
) source
662 $(Q
)test -e .gitignore || \
663 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
666 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
667 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
668 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
669 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
670 CC_VERSION_TEXT
= $(subst $(pound
),,$(shell LC_ALL
=C
$(CC
) --version
2>/dev
/null | head
-n
1))
672 ifneq ($(findstring clang
,$(CC_VERSION_TEXT
)),)
673 include $(srctree
)/scripts
/Makefile.clang
676 # Include this also for config targets because some architectures need
677 # cc-cross-prefix to determine CROSS_COMPILE.
679 include $(srctree
)/scripts
/Makefile.compiler
683 # ===========================================================================
684 # *config targets only - make sure prerequisites are updated, and descend
685 # in scripts/kconfig to make the *config target
687 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
688 # KBUILD_DEFCONFIG may point out an alternative default configuration
689 # used for 'make defconfig'
690 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
691 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
693 config
: outputmakefile scripts_basic FORCE
694 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
696 %config
: outputmakefile scripts_basic FORCE
697 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
700 # ===========================================================================
701 # Build targets only - this includes vmlinux, arch specific targets, clean
702 # targets and others. In general all targets except *config targets.
704 # If building an external module we do not care about the all: rule
705 # but instead __all depend on modules
707 ifeq ($(KBUILD_EXTMOD
),)
715 # Decide whether to build built-in, modular, or both.
716 # Normally, just do built-in.
721 # If we have only "make modules", don't compile built-in objects.
722 ifeq ($(MAKECMDGOALS
),modules
)
726 # If we have "make <whatever> modules", compile modules
727 # in addition to whatever we do anyway.
728 # Just "make" or "make all" shall build modules as well
730 ifneq ($(filter all modules nsdeps
%compile_commands.json clang-
%,$(MAKECMDGOALS
)),)
734 ifeq ($(MAKECMDGOALS
),)
738 export KBUILD_MODULES KBUILD_BUILTIN
741 include include/config
/auto.conf
744 ifeq ($(KBUILD_EXTMOD
),)
745 # Objects we will link into vmlinux / subdirs we need to visit
749 endif # KBUILD_EXTMOD
751 # The all: target is the default when no target is given on the
753 # This allow a user to issue only 'make' to build a kernel including modules
754 # Defaults to vmlinux, but the arch makefile usually adds further targets
757 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
758 ifdef CONFIG_CC_IS_GCC
759 CFLAGS_GCOV
+= -fno-tree-loop-im
763 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
764 ifdef CONFIG_FUNCTION_TRACER
765 CC_FLAGS_FTRACE
:= -pg
768 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
771 ifdef may-sync-config
772 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
773 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
774 # because some architectures define CROSS_COMPILE there.
775 include include/config
/auto.conf.cmd
779 @echo
>&2 '*** Configuration file "$@" not found!'
781 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
782 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
786 # The actual configuration files used during the build are stored in
787 # include/generated/ and include/config/. Update them if .config is newer than
788 # include/config/auto.conf (which mirrors .config).
790 # This exploits the 'multi-target pattern rule' trick.
791 # The syncconfig should be executed only once to make all the targets.
792 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
794 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
795 # so you cannot notice that Kconfig is waiting for the user input.
796 %/config
/auto.conf
%/config
/auto.conf.cmd
%/generated
/autoconf.h
%/generated
/rustc_cfg
: $(KCONFIG_CONFIG
)
797 $(Q
)$(kecho
) " SYNC $@"
798 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
799 else # !may-sync-config
800 # External modules and some install targets need include/generated/autoconf.h
801 # and include/config/auto.conf but do not care if they are up-to-date.
802 # Use auto.conf to trigger the test
803 PHONY
+= include/config
/auto.conf
805 include/config
/auto.conf
:
806 @
test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
808 echo
>&2 " ERROR: Kernel configuration is invalid."; \
809 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
810 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
814 endif # may-sync-config
817 KBUILD_CFLAGS
+= -fno-delete-null-pointer-checks
819 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
821 KBUILD_RUSTFLAGS
+= -Copt-level
=2
822 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
824 KBUILD_RUSTFLAGS
+= -Copt-level
=s
827 # Always set `debug-assertions` and `overflow-checks` because their default
828 # depends on `opt-level` and `debug-assertions`, respectively.
829 KBUILD_RUSTFLAGS
+= -Cdebug-assertions
=$(if
$(CONFIG_RUST_DEBUG_ASSERTIONS
),y
,n
)
830 KBUILD_RUSTFLAGS
+= -Coverflow-checks
=$(if
$(CONFIG_RUST_OVERFLOW_CHECKS
),y
,n
)
832 # Tell gcc to never replace conditional load with a non-conditional one
833 ifdef CONFIG_CC_IS_GCC
834 # gcc-10 renamed --param=allow-store-data-races=0 to
835 # -fno-allow-store-data-races.
836 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
837 KBUILD_CFLAGS
+= $(call cc-option
,-fno-allow-store-data-races
)
840 ifdef CONFIG_READABLE_ASM
841 # Disable optimizations that make assembler listings hard to read.
842 # reorder blocks reorders the control in the function
843 # ipa clone creates specialized cloned functions
844 # partial inlining inlines only parts of functions
845 KBUILD_CFLAGS
+= -fno-reorder-blocks
-fno-ipa-cp-clone
-fno-partial-inlining
848 stackp-flags-y
:= -fno-stack-protector
849 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
850 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
852 KBUILD_CFLAGS
+= $(stackp-flags-y
)
854 KBUILD_RUSTFLAGS-
$(CONFIG_WERROR
) += -Dwarnings
855 KBUILD_RUSTFLAGS
+= $(KBUILD_RUSTFLAGS-y
)
857 ifdef CONFIG_FRAME_POINTER
858 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
859 KBUILD_RUSTFLAGS
+= -Cforce-frame-pointers
=y
861 # Some targets (ARM with Thumb2, for example), can't be built with frame
862 # pointers. For those, we don't have FUNCTION_TRACER automatically
863 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
864 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
865 # -fomit-frame-pointer with FUNCTION_TRACER.
866 # In the Rust target specification, "frame-pointer" is set explicitly
868 ifndef CONFIG_FUNCTION_TRACER
869 KBUILD_CFLAGS
+= -fomit-frame-pointer
873 # Initialize all stack variables with a 0xAA pattern.
874 ifdef CONFIG_INIT_STACK_ALL_PATTERN
875 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
878 # Initialize all stack variables with a zero value.
879 ifdef CONFIG_INIT_STACK_ALL_ZERO
880 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=zero
881 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
882 # https://github.com/llvm/llvm-project/issues/44842
883 CC_AUTO_VAR_INIT_ZERO_ENABLER
:= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
884 export CC_AUTO_VAR_INIT_ZERO_ENABLER
885 KBUILD_CFLAGS
+= $(CC_AUTO_VAR_INIT_ZERO_ENABLER
)
889 # While VLAs have been removed, GCC produces unreachable stack probes
890 # for the randomize_kstack_offset feature. Disable it for all compilers.
891 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-clash-protection
)
893 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
894 ifdef CONFIG_ZERO_CALL_USED_REGS
895 KBUILD_CFLAGS
+= -fzero-call-used-regs
=used-gpr
898 ifdef CONFIG_FUNCTION_TRACER
899 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
900 CC_FLAGS_FTRACE
+= -mrecord-mcount
901 ifdef CONFIG_HAVE_NOP_MCOUNT
902 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
903 CC_FLAGS_FTRACE
+= -mnop-mcount
904 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
908 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
909 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
910 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
913 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
914 ifdef CONFIG_HAVE_C_RECORDMCOUNT
915 BUILD_C_RECORDMCOUNT
:= y
916 export BUILD_C_RECORDMCOUNT
919 ifdef CONFIG_HAVE_FENTRY
920 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
921 ifeq ($(call cc-option-yn
, -mfentry
),y
)
922 CC_FLAGS_FTRACE
+= -mfentry
923 CC_FLAGS_USING
+= -DCC_USING_FENTRY
926 export CC_FLAGS_FTRACE
927 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
928 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
931 # We trigger additional mismatches with less inlining
932 ifdef CONFIG_DEBUG_SECTION_MISMATCH
933 KBUILD_CFLAGS
+= -fno-inline-functions-called-once
936 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
937 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
938 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
939 KBUILD_RUSTFLAGS_KERNEL
+= -Zfunction-sections
=y
940 LDFLAGS_vmlinux
+= --gc-sections
943 ifdef CONFIG_SHADOW_CALL_STACK
944 ifndef CONFIG_DYNAMIC_SCS
945 CC_FLAGS_SCS
:= -fsanitize
=shadow-call-stack
946 KBUILD_CFLAGS
+= $(CC_FLAGS_SCS
)
951 ifdef CONFIG_LTO_CLANG
952 ifdef CONFIG_LTO_CLANG_THIN
953 CC_FLAGS_LTO
:= -flto
=thin
-fsplit-lto-unit
954 KBUILD_LDFLAGS
+= --thinlto-cache-dir
=$(extmod_prefix
).thinlto-cache
956 CC_FLAGS_LTO
:= -flto
958 CC_FLAGS_LTO
+= -fvisibility
=hidden
960 # Limit inlining across translation units to reduce binary size
961 KBUILD_LDFLAGS
+= -mllvm
-import-instr-limit
=5
963 # Check for frame size exceeding threshold during prolog/epilog insertion
964 # when using lld < 13.0.0.
965 ifneq ($(CONFIG_FRAME_WARN
),0)
966 ifeq ($(call test-lt
, $(CONFIG_LLD_VERSION
), 130000),y
)
967 KBUILD_LDFLAGS
+= -plugin-opt
=-warn-stack-size
=$(CONFIG_FRAME_WARN
)
973 KBUILD_CFLAGS
+= -fno-lto
$(CC_FLAGS_LTO
)
974 KBUILD_AFLAGS
+= -fno-lto
978 ifdef CONFIG_CFI_CLANG
979 CC_FLAGS_CFI
:= -fsanitize
=kcfi
980 KBUILD_CFLAGS
+= $(CC_FLAGS_CFI
)
984 ifneq ($(CONFIG_FUNCTION_ALIGNMENT
),0)
985 KBUILD_CFLAGS
+= -falign-functions
=$(CONFIG_FUNCTION_ALIGNMENT
)
988 # arch Makefile may override CC so keep this after arch Makefile is included
989 NOSTDINC_FLAGS
+= -nostdinc
991 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
992 # the kernel uses only C99 flexible arrays for dynamically sized trailing
993 # arrays. Enforce this for everything that may examine structure sizes and
994 # perform bounds checking.
995 KBUILD_CFLAGS
+= $(call cc-option
, -fstrict-flex-arrays
=3)
997 # disable invalid "can't wrap" optimizations for signed / pointers
998 KBUILD_CFLAGS
+= -fno-strict-overflow
1000 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1001 KBUILD_CFLAGS
+= -fno-stack-check
1003 # conserve stack if available
1004 ifdef CONFIG_CC_IS_GCC
1005 KBUILD_CFLAGS
+= -fconserve-stack
1008 # change __FILE__ to the relative path from the srctree
1009 KBUILD_CPPFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
1011 # include additional Makefiles when needed
1012 include-y
:= scripts
/Makefile.extrawarn
1013 include-
$(CONFIG_DEBUG_INFO
) += scripts
/Makefile.debug
1014 include-
$(CONFIG_KASAN
) += scripts
/Makefile.kasan
1015 include-
$(CONFIG_KCSAN
) += scripts
/Makefile.kcsan
1016 include-
$(CONFIG_KMSAN
) += scripts
/Makefile.kmsan
1017 include-
$(CONFIG_UBSAN
) += scripts
/Makefile.ubsan
1018 include-
$(CONFIG_KCOV
) += scripts
/Makefile.kcov
1019 include-
$(CONFIG_RANDSTRUCT
) += scripts
/Makefile.randstruct
1020 include-
$(CONFIG_GCC_PLUGINS
) += scripts
/Makefile.gcc-plugins
1022 include $(addprefix $(srctree
)/, $(include-y
))
1024 # scripts/Makefile.gcc-plugins is intentionally included last.
1025 # Do not add $(call cc-option,...) below this line. When you build the kernel
1026 # from the clean source tree, the GCC plugins do not exist at this point.
1028 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1029 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
1030 KBUILD_AFLAGS
+= $(KAFLAGS
)
1031 KBUILD_CFLAGS
+= $(KCFLAGS
)
1032 KBUILD_RUSTFLAGS
+= $(KRUSTFLAGS
)
1034 KBUILD_LDFLAGS_MODULE
+= --build-id
=sha1
1035 LDFLAGS_vmlinux
+= --build-id
=sha1
1037 KBUILD_LDFLAGS
+= -z noexecstack
1038 ifeq ($(CONFIG_LD_IS_BFD
),y
)
1039 KBUILD_LDFLAGS
+= $(call ld-option
,--no-warn-rwx-segments
)
1042 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
1043 LDFLAGS_vmlinux
+= -X
1046 ifeq ($(CONFIG_RELR
),y
)
1047 # ld.lld before 15 did not support -z pack-relative-relocs.
1048 LDFLAGS_vmlinux
+= $(call ld-option
,--pack-dyn-relocs
=relr
,-z pack-relative-relocs
)
1051 # We never want expected sections to be placed heuristically by the
1052 # linker. All sections should be explicitly named in the linker script.
1053 ifdef CONFIG_LD_ORPHAN_WARN
1054 LDFLAGS_vmlinux
+= --orphan-handling
=$(CONFIG_LD_ORPHAN_WARN_LEVEL
)
1057 # Align the bit size of userspace programs with the kernel
1058 KBUILD_USERCFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1059 KBUILD_USERLDFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1061 # make the checker run with the right architecture
1062 CHECKFLAGS
+= --arch
=$(ARCH
)
1064 # insure the checker run with the right endianness
1065 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
1067 # the checker needs the correct machine size
1068 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
1070 # Default kernel image to build when no specific target is given.
1071 # KBUILD_IMAGE may be overruled on the command line or
1072 # set in the environment
1073 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1074 # this default value
1075 export KBUILD_IMAGE ?
= vmlinux
1078 # INSTALL_PATH specifies where to place the updated kernel and system map
1079 # images. Default is /boot, but you can set it to other values
1080 export INSTALL_PATH ?
= /boot
1083 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1084 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1085 # an argument if needed. Otherwise it defaults to the kernel install path
1087 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
1090 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1091 # relocations required by build roots. This is not defined in the
1092 # makefile but the argument can be passed to make if needed.
1095 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
1100 export extmod_prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
1101 export MODORDER
:= $(extmod_prefix
)modules.order
1102 export MODULES_NSDEPS
:= $(extmod_prefix
)modules.nsdeps
1104 ifeq ($(KBUILD_EXTMOD
),)
1107 clean-dirs
:= $(sort . Documentation \
1108 $(patsubst %/,%,$(filter %/, $(core-
) \
1109 $(drivers-
) $(libs-
))))
1111 export ARCH_CORE
:= $(core-y
)
1112 export ARCH_LIB
:= $(filter %/, $(libs-y
))
1113 export ARCH_DRIVERS
:= $(drivers-y
) $(drivers-m
)
1114 # Externally visible symbols (used by link-vmlinux.sh)
1116 KBUILD_VMLINUX_OBJS
:= .
/built-in.a
1117 ifdef CONFIG_MODULES
1118 KBUILD_VMLINUX_OBJS
+= $(patsubst %/, %/lib.a
, $(filter %/, $(libs-y
)))
1119 KBUILD_VMLINUX_LIBS
:= $(filter-out %/, $(libs-y
))
1121 KBUILD_VMLINUX_LIBS
:= $(patsubst %/,%/lib.a
, $(libs-y
))
1124 export KBUILD_VMLINUX_LIBS
1125 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1127 ifdef CONFIG_TRIM_UNUSED_KSYMS
1128 # For the kernel to actually contain only the needed exported symbols,
1129 # we have to build modules as well to determine what those symbols are.
1133 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1134 quiet_cmd_ar_vmlinux.a
= AR
$@
1135 cmd_ar_vmlinux.a
= \
1137 $(AR
) cDPrST
$@
$(KBUILD_VMLINUX_OBJS
); \
1138 $(AR
) mPiT
$$($(AR
) t
$@ | sed
-n
1p
) $@
$$($(AR
) t
$@ | grep
-F
-f
$(srctree
)/scripts
/head-object-list.txt
)
1140 targets
+= vmlinux.a
1141 vmlinux.a
: $(KBUILD_VMLINUX_OBJS
) scripts
/head-object-list.txt FORCE
1142 $(call if_changed
,ar_vmlinux.a
)
1145 vmlinux_o
: vmlinux.a
$(KBUILD_VMLINUX_LIBS
)
1146 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux_o
1148 vmlinux.o modules.builtin.modinfo modules.builtin
: vmlinux_o
1152 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1153 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1154 # unrelated; the decompressors just happen to have the same base name,
1155 # arch/*/boot/compressed/vmlinux.
1156 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1158 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1159 # https://savannah.gnu.org/bugs/?61463
1160 # For Make > 4.4, the following simple code will work:
1161 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1162 vmlinux
: private _LDFLAGS_vmlinux
:= $(LDFLAGS_vmlinux
)
1163 vmlinux
: export LDFLAGS_vmlinux
= $(_LDFLAGS_vmlinux
)
1164 vmlinux
: vmlinux.o
$(KBUILD_LDS
) modpost
1165 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.vmlinux
1167 # The actual objects are generated when descending,
1168 # make sure no implicit rule kicks in
1169 $(sort $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)): .
;
1171 ifeq ($(origin KERNELRELEASE
),file
)
1172 filechk_kernel.release
= $(srctree
)/scripts
/setlocalversion
$(srctree
)
1174 filechk_kernel.release
= echo
$(KERNELRELEASE
)
1177 # Store (new) KERNELRELEASE string in include/config/kernel.release
1178 include/config
/kernel.release
: FORCE
1179 $(call filechk
,kernel.release
)
1181 # Additional helpers built in scripts/
1182 # Carefully list dependencies so we do not try to build scripts twice
1185 scripts
: scripts_basic scripts_dtc
1186 $(Q
)$(MAKE
) $(build
)=$(@
)
1188 # Things we need to do before we recursively start building the kernel
1189 # or the modules are listed in "prepare".
1190 # A multi level approach is used. prepareN is processed before prepareN-1.
1191 # archprepare is used in arch Makefiles and when processed asm symlink,
1192 # version.h and scripts_basic is processed / created.
1194 PHONY
+= prepare archprepare
1196 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1197 asm-generic
$(version_h
) include/generated
/utsrelease.h \
1198 include/generated
/compile.h
include/generated
/autoconf.h remove-stale-files
1200 prepare0
: archprepare
1201 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1202 $(Q
)$(MAKE
) $(build
)=. prepare
1204 # All the preparing..
1207 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
1208 $(Q
)$(MAKE
) $(build
)=rust
1211 PHONY
+= remove-stale-files
1213 $(Q
)$(srctree
)/scripts
/remove-stale-files
1215 # Support for using generic headers in asm-generic
1216 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1218 PHONY
+= asm-generic uapi-asm-generic
1219 asm-generic
: uapi-asm-generic
1220 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1221 generic
=include/asm-generic
1223 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1224 generic
=include/uapi
/asm-generic
1226 # Generate some files
1227 # ---------------------------------------------------------------------------
1229 # KERNELRELEASE can change from a few different places, meaning version.h
1230 # needs to be updated, so this check is forced on all builds
1233 define filechk_utsrelease.h
1234 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1235 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1238 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1241 define filechk_version.h
1242 if
[ $(SUBLEVEL
) -gt
255 ]; then \
1243 echo \
#define LINUX_VERSION_CODE $(shell \
1244 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + 255); \
1246 echo \
#define LINUX_VERSION_CODE $(shell \
1247 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
1249 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1250 ((c) > 255 ? 255 : (c)))'; \
1251 echo \
#define LINUX_VERSION_MAJOR $(VERSION); \
1252 echo \
#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1253 echo \
#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1256 $(version_h
): PATCHLEVEL
:= $(or
$(PATCHLEVEL
), 0)
1257 $(version_h
): SUBLEVEL
:= $(or
$(SUBLEVEL
), 0)
1259 $(call filechk
,version.h
)
1261 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1262 $(call filechk
,utsrelease.h
)
1264 filechk_compile.h
= $(srctree
)/scripts
/mkcompile_h \
1265 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1267 include/generated
/compile.h
: FORCE
1268 $(call filechk
,compile.h
)
1272 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1273 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1275 # ---------------------------------------------------------------------------
1278 #Default location for installed headers
1279 export INSTALL_HDR_PATH
= $(objtree
)/usr
1281 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1282 cmd_headers_install
= \
1283 mkdir
-p
$(INSTALL_HDR_PATH
); \
1284 rsync
-mrl
--include='*/' --include='*\.h' --exclude
='*' \
1285 usr
/include $(INSTALL_HDR_PATH
)
1287 PHONY
+= headers_install
1288 headers_install
: headers
1289 $(call cmd
,headers_install
)
1291 PHONY
+= archheaders archscripts
1293 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1296 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1297 $(if
$(filter um
, $(SRCARCH
)), $(error Headers not exportable for UML
))
1298 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1299 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1301 ifdef CONFIG_HEADERS_INSTALL
1305 PHONY
+= scripts_unifdef
1306 scripts_unifdef
: scripts_basic
1307 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1309 # ---------------------------------------------------------------------------
1312 # Many distributions have the custom install script, /sbin/installkernel.
1313 # If DKMS is installed, 'make install' will eventually recurse back
1314 # to this Makefile to build and install external modules.
1315 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1317 quiet_cmd_install
= INSTALL
$(INSTALL_PATH
)
1318 cmd_install
= unset sub_make_done
; $(srctree
)/scripts
/install.sh
1320 # ---------------------------------------------------------------------------
1323 ifdef CONFIG_OBJTOOL
1324 prepare
: tools
/objtool
1328 ifdef CONFIG_DEBUG_INFO_BTF
1329 prepare
: tools
/bpf
/resolve_btfids
1333 PHONY
+= resolve_btfids_clean
1335 resolve_btfids_O
= $(abspath
$(objtree
))/tools
/bpf
/resolve_btfids
1337 # tools/bpf/resolve_btfids directory might not exist
1338 # in output directory, skip its clean in that case
1339 resolve_btfids_clean
:
1340 ifneq ($(wildcard $(resolve_btfids_O
)),)
1341 $(Q
)$(MAKE
) -sC
$(srctree
)/tools
/bpf
/resolve_btfids O
=$(resolve_btfids_O
) clean
1344 # Clear a bunch of variables before executing the submake
1345 ifeq ($(quiet
),silent_
)
1350 $(Q
)mkdir
-p
$(objtree
)/tools
1351 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1354 $(Q
)mkdir
-p
$(objtree
)/tools
1355 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1357 # ---------------------------------------------------------------------------
1362 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1364 kselftest-
%: headers FORCE
1365 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1367 PHONY
+= kselftest-merge
1369 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1370 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config | \
1371 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-m
$(objtree
)/.config
1372 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1374 # ---------------------------------------------------------------------------
1377 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1378 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1384 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1386 %.dtbo
: dtbs_prepare
1387 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1389 PHONY
+= dtbs dtbs_prepare dtbs_install dtbs_check
1391 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1393 # include/config/kernel.release is actually needed when installing DTBs because
1394 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1395 # dtbs_install depend on it as dtbs_install may run as root.
1396 dtbs_prepare
: include/config
/kernel.release scripts_dtc
1398 ifneq ($(filter dtbs_check
, $(MAKECMDGOALS
)),)
1402 ifneq ($(CHECK_DTBS
),)
1403 dtbs_prepare
: dt_binding_check
1409 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
) dst
=$(INSTALL_DTBS_PATH
)
1411 ifdef CONFIG_OF_EARLY_FLATTREE
1417 PHONY
+= scripts_dtc
1418 scripts_dtc
: scripts_basic
1419 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1421 ifneq ($(filter dt_binding_check
, $(MAKECMDGOALS
)),)
1422 export CHECK_DT_BINDING
=y
1425 PHONY
+= dt_binding_check
1426 dt_binding_check
: scripts_dtc
1427 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1429 PHONY
+= dt_compatible_check
1430 dt_compatible_check
: dt_binding_check
1431 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
$@
1433 # ---------------------------------------------------------------------------
1436 ifdef CONFIG_MODULES
1438 # By default, build modules as well
1442 # When we're building modules with modversions, we need to consider
1443 # the built-in objects during the descend as well, in order to
1444 # make sure the checksums are up to date before we record them.
1445 ifdef CONFIG_MODVERSIONS
1452 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1454 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1459 modules
: modules_prepare
1461 # Target to prepare building external modules
1462 modules_prepare
: prepare
1463 $(Q
)$(MAKE
) $(build
)=scripts scripts
/module.lds
1465 endif # CONFIG_MODULES
1468 # Cleaning is done on three levels.
1469 # make clean Delete most generated files
1470 # Leave enough to build external modules
1471 # make mrproper Delete the current configuration, and all generated files
1472 # make distclean Remove editor backup files, patch leftover files and the like
1474 # Directories & files removed with 'make clean'
1475 CLEAN_FILES
+= vmlinux.symvers modules-only.symvers \
1476 modules.builtin modules.builtin.modinfo modules.nsdeps \
1477 compile_commands.json .thinlto-cache rust
/test rust
/doc \
1478 rust-project.json .vmlinux.objs .vmlinux.
export.c
1480 # Directories & files removed with 'make mrproper'
1481 MRPROPER_FILES
+= include/config
include/generated \
1482 arch
/$(SRCARCH
)/include/generated .objdiff \
1483 debian snap tar-install \
1484 .config .config.old .version \
1486 certs
/signing_key.pem \
1489 kernel.spec rpmbuild \
1492 # clean - Delete most, but leave enough to build external modules
1494 clean: rm-files
:= $(CLEAN_FILES
)
1496 PHONY
+= archclean vmlinuxclean
1499 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1500 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1502 clean: archclean vmlinuxclean resolve_btfids_clean
1504 # mrproper - Delete all generated files, including .config
1506 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1507 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1509 PHONY
+= $(mrproper-dirs
) mrproper
1511 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1513 mrproper
: clean $(mrproper-dirs
)
1515 @find .
$(RCS_FIND_IGNORE
) \
1516 \
( -name
'*.rmeta' \
) \
1517 -type f
-print | xargs
rm -f
1524 @find .
$(RCS_FIND_IGNORE
) \
1525 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1526 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1527 -o
-name
'core' -o
-name
tags -o
-name TAGS
-o
-name
'cscope*' \
1528 -o
-name GPATH
-o
-name GRTAGS
-o
-name GSYMS
-o
-name GTAGS \
) \
1529 -type f
-print | xargs
rm -f
1532 # Packaging of the kernel to various formats
1533 # ---------------------------------------------------------------------------
1536 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1537 %pkg
: include/config
/kernel.release FORCE
1538 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1540 # Brief documentation of the typical targets used
1541 # ---------------------------------------------------------------------------
1543 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1544 boards
:= $(sort $(notdir $(boards
)))
1545 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1546 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1550 @echo
'Cleaning targets:'
1551 @echo
' clean - Remove most generated files but keep the config and'
1552 @echo
' enough build support to build external modules'
1553 @echo
' mrproper - Remove all generated files + config + various backup files'
1554 @echo
' distclean - mrproper + remove editor backup and patch files'
1556 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1558 @echo
'Other generic targets:'
1559 @echo
' all - Build all targets marked with [*]'
1560 @echo
'* vmlinux - Build the bare kernel'
1561 @echo
'* modules - Build all modules'
1562 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1563 @echo
' dir/ - Build all files in dir and below'
1564 @echo
' dir/file.[ois] - Build specified target only'
1565 @echo
' dir/file.ll - Build the LLVM assembly file'
1566 @echo
' (requires compiler support for LLVM assembly generation)'
1567 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1568 @echo
' (requires a recent binutils and recent build (System.map))'
1569 @echo
' dir/file.ko - Build module including final link'
1570 @echo
' modules_prepare - Set up for building external modules'
1571 @echo
' tags/TAGS - Generate tags file for editors'
1572 @echo
' cscope - Generate cscope index'
1573 @echo
' gtags - Generate GNU GLOBAL index'
1574 @echo
' kernelrelease - Output the release version string (use with make -s)'
1575 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1576 @echo
' image_name - Output the image name (use with make -s)'
1577 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1578 echo
' (default: $(INSTALL_HDR_PATH))'; \
1580 @echo
'Static analysers:'
1581 @echo
' checkstack - Generate a list of stack hogs'
1582 @echo
' versioncheck - Sanity check on version.h usage'
1583 @echo
' includecheck - Check for duplicate included header files'
1584 @echo
' export_report - List the usages of all exported symbols'
1585 @echo
' headerdep - Detect inclusion cycles in headers'
1586 @echo
' coccicheck - Check with Coccinelle'
1587 @echo
' clang-analyzer - Check with clang static analyzer'
1588 @echo
' clang-tidy - Check with clang-tidy'
1591 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1593 @echo
'Kernel selftest:'
1594 @echo
' kselftest - Build and run kernel selftest'
1595 @echo
' Build, install, and boot kernel before'
1596 @echo
' running kselftest on it'
1597 @echo
' Run as root for full coverage'
1598 @echo
' kselftest-all - Build kernel selftest'
1599 @echo
' kselftest-install - Build and install kernel selftest'
1600 @echo
' kselftest-clean - Remove all generated kselftest files'
1601 @echo
' kselftest-merge - Merge all the config dependencies of'
1602 @echo
' kselftest to existing .config.'
1604 @echo
'Rust targets:'
1605 @echo
' rustavailable - Checks whether the Rust toolchain is'
1606 @echo
' available and, if not, explains why.'
1607 @echo
' rustfmt - Reformat all the Rust code in the kernel'
1608 @echo
' rustfmtcheck - Checks if all the Rust code in the kernel'
1609 @echo
' is formatted, printing a diff otherwise.'
1610 @echo
' rustdoc - Generate Rust documentation'
1611 @echo
' (requires kernel .config)'
1612 @echo
' rusttest - Runs the Rust tests'
1613 @echo
' (requires kernel .config; downloads external repos)'
1614 @echo
' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1615 @echo
' (requires kernel .config)'
1616 @echo
' dir/file.[os] - Build specified target only'
1617 @echo
' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1618 @echo
' Run with RUSTFMT=n to skip reformatting if needed.'
1619 @echo
' The output is not intended to be compilable.'
1620 @echo
' dir/file.ll - Build the LLVM assembly file'
1623 echo
'Devicetree:'; \
1624 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1625 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1626 echo
' dt_binding_check - Validate device tree binding documents'; \
1627 echo
' dtbs_check - Validate device tree source files';\
1630 @echo
'Userspace tools targets:'
1631 @echo
' use "make tools/help"'
1632 @echo
' or "cd tools; make help"'
1634 @echo
'Kernel packaging:'
1635 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1637 @echo
'Documentation targets:'
1638 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1640 @echo
'Architecture specific targets ($(SRCARCH)):'
1642 echo
' No architecture specific help defined for $(SRCARCH)')
1645 $(foreach b
, $(boards
), \
1646 printf
" %-27s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1648 @
$(if
$(board-dirs
), \
1649 $(foreach b
, $(board-dirs
), \
1650 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1651 printf
" %-16s - Show all of the above\\n" help-boards
; \
1654 @echo
' make V=n [targets] 1: verbose build'
1655 @echo
' 2: give reason for rebuild of target'
1656 @echo
' V=1 and V=2 can be combined with V=12'
1657 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1658 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK'
1659 @echo
' (sparse by default)'
1660 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1661 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1662 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1663 @echo
' 1: warnings which may be relevant and do not occur too often'
1664 @echo
' 2: warnings which occur quite often but may still be relevant'
1665 @echo
' 3: more obscure warnings, can most likely be ignored'
1666 @echo
' e: warnings are being treated as errors'
1667 @echo
' Multiple levels can be combined with W=12 or W=123'
1669 echo
' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1670 echo
' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1673 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1674 @echo
'For further info see the ./README file'
1677 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1679 help-boards
: $(help-board-dirs
)
1681 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1683 $(help-board-dirs
): help-
%:
1684 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1685 @
$(if
$(boards-per-dir
), \
1686 $(foreach b
, $(boards-per-dir
), \
1687 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1691 # Documentation targets
1692 # ---------------------------------------------------------------------------
1693 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1694 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1695 PHONY
+= $(DOC_TARGETS
)
1697 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1701 # ---------------------------------------------------------------------------
1703 # "Is Rust available?" target
1704 PHONY
+= rustavailable
1706 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/rust_is_available.sh
&& echo
"Rust is available!"
1708 # Documentation target
1710 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1713 $(Q
)$(MAKE
) $(build
)=rust
$@
1718 $(Q
)$(MAKE
) $(build
)=rust
$@
1720 # Formatting targets
1721 PHONY
+= rustfmt rustfmtcheck
1723 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1725 # We match using absolute paths since `find` does not resolve them
1726 # when matching, which is a problem when e.g. `srctree` is `..`.
1727 # We `grep` afterwards in order to remove the directory entry itself.
1729 $(Q
)find
$(abs_srctree
) -type f
-name
'*.rs' \
1730 -o
-path
$(abs_srctree
)/rust
/alloc
-prune \
1731 -o
-path
$(abs_objtree
)/rust
/test -prune \
1732 | grep
-Fv
$(abs_srctree
)/rust
/alloc \
1733 | grep
-Fv
$(abs_objtree
)/rust
/test \
1734 | grep
-Fv generated \
1735 | xargs
$(RUSTFMT
) $(rustfmt_flags
)
1737 rustfmtcheck
: rustfmt_flags
= --check
1738 rustfmtcheck
: rustfmt
1741 # ---------------------------------------------------------------------------
1745 $(Q
)$(srctree
)/scripts
/misc-check
1749 PHONY
+= scripts_gdb
1750 scripts_gdb
: prepare0
1751 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1752 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1754 ifdef CONFIG_GDB_SCRIPTS
1758 else # KBUILD_EXTMOD
1760 filechk_kernel.release
= echo
$(KERNELRELEASE
)
1763 # External module support.
1764 # When building external modules the kernel used as basis is considered
1765 # read-only, and no consistency checks are made and the make
1766 # system is not used on the basis kernel. If updates are required
1767 # in the basis kernel ordinary make commands (without M=...) must be used.
1769 # We are always building only modules.
1773 build-dir
:= $(KBUILD_EXTMOD
)
1775 compile_commands.json
: $(extmod_prefix
)compile_commands.json
1776 PHONY
+= compile_commands.json
1778 clean-dirs
:= $(KBUILD_EXTMOD
)
1779 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
$(KBUILD_EXTMOD
)/modules.nsdeps \
1780 $(KBUILD_EXTMOD
)/compile_commands.json
$(KBUILD_EXTMOD
)/.thinlto-cache
1783 # now expand this into a simple variable to reduce the cost of shell evaluations
1784 prepare
: CC_VERSION_TEXT
:= $(CC_VERSION_TEXT
)
1786 @if
[ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1787 echo
>&2 "warning: the compiler differs from the one used to build the kernel"; \
1788 echo
>&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1789 echo
>&2 " You are using: $(CC_VERSION_TEXT)"; \
1794 @echo
' Building external modules.'
1795 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1797 @echo
' modules - default target, build the module(s)'
1798 @echo
' modules_install - install the module'
1799 @echo
' clean - remove generated files in module directory only'
1800 @echo
' rust-analyzer - generate rust-project.json rust-analyzer support file'
1803 ifndef CONFIG_MODULES
1804 modules modules_install
: __external_modules_error
1805 __external_modules_error
:
1807 @echo
>&2 '*** The present kernel disabled CONFIG_MODULES.'
1808 @echo
>&2 '*** You cannot build or install external modules.'
1813 endif # KBUILD_EXTMOD
1815 # ---------------------------------------------------------------------------
1818 PHONY
+= modules modules_install modules_sign modules_prepare
1821 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst \
1822 sign-only
=$(if
$(filter modules_install
,$(MAKECMDGOALS
)),,y
)
1824 ifeq ($(CONFIG_MODULE_SIG
),y
)
1825 # modules_sign is a subset of modules_install.
1826 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1827 modules_sign
: modules_install
1832 @echo
>&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1837 ifdef CONFIG_MODULES
1839 $(MODORDER
): $(build-dir
)
1842 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1843 # This is solely useful to speed up test compiles.
1845 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
1846 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
1849 PHONY
+= modules_check
1850 modules_check
: $(MODORDER
)
1851 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
$<
1853 else # CONFIG_MODULES
1860 endif # CONFIG_MODULES
1863 modpost
: $(if
$(single-build
),, $(if
$(KBUILD_BUILTIN
), vmlinux.o
)) \
1864 $(if
$(KBUILD_MODULES
), modules_check
)
1865 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1868 # ---------------------------------------------------------------------------
1869 # To build individual files in subdirectories, you can do like this:
1871 # make foo/bar/baz.s
1873 # The supported suffixes for single-target are listed in 'single-targets'
1875 # To build only under specific subdirectories, you can do like this:
1881 # .ko is special because modpost is needed
1882 single-ko
:= $(sort $(filter %.ko
, $(MAKECMDGOALS
)))
1883 single-no-ko
:= $(filter-out $(single-ko
), $(MAKECMDGOALS
)) \
1884 $(foreach x
, o mod
, $(patsubst %.ko
, %.
$x, $(single-ko
)))
1886 $(single-ko
): single_modules
1888 $(single-no-ko
): $(build-dir
)
1891 # Remove MODORDER when done because it is not the real one.
1892 PHONY
+= single_modules
1893 single_modules
: $(single-no-ko
) modules_prepare
1894 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod_prefix
)$(m
:%.ko
=%.o
);) } > $(MODORDER
)
1895 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1896 ifneq ($(KBUILD_MODPOST_NOFINAL
),1)
1897 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modfinal
1899 $(Q
)rm -f
$(MODORDER
)
1901 single-goals
:= $(addprefix $(build-dir
)/, $(single-no-ko
))
1907 # Preset locale variables to speed up the build process. Limit locale
1908 # tweaks to this spot to avoid wrong language settings when running
1909 # make menuconfig etc.
1910 # Error messages still appears in the original language
1911 PHONY
+= $(build-dir
)
1912 $(build-dir
): prepare
1913 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1 need-modorder
=1 $(single-goals
)
1915 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
1916 PHONY
+= $(clean-dirs
) clean
1918 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1920 clean: $(clean-dirs
)
1922 @find
$(or
$(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1923 \
( -name
'*.[aios]' -o
-name
'*.rsi' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1925 -o
-name
'*.dtb' -o
-name
'*.dtbo' \
1926 -o
-name
'*.dtb.S' -o
-name
'*.dtbo.S' \
1927 -o
-name
'*.dt.yaml' \
1928 -o
-name
'*.dwo' -o
-name
'*.lst' \
1929 -o
-name
'*.su' -o
-name
'*.mod' \
1930 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1931 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1932 -o
-name
'*.asn1.[ch]' \
1933 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1934 -o
-name
'*.c.[012]*.*' \
1937 -o
-name
'*.*.symversions' \
) -type f
-print \
1938 -o
-name
'.tmp_*' -print \
1941 # Generate tags for editors
1942 # ---------------------------------------------------------------------------
1943 quiet_cmd_tags
= GEN
$@
1944 cmd_tags
= $(BASH
) $(srctree
)/scripts
/tags.sh
$@
1946 tags TAGS cscope gtags
: FORCE
1949 # IDE support targets
1950 PHONY
+= rust-analyzer
1952 $(Q
)$(MAKE
) $(build
)=rust
$@
1954 # Script to generate missing namespace dependencies
1955 # ---------------------------------------------------------------------------
1958 nsdeps
: export KBUILD_NSDEPS
=1
1960 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/nsdeps
1963 # ---------------------------------------------------------------------------
1965 quiet_cmd_gen_compile_commands
= GEN
$@
1966 cmd_gen_compile_commands
= $(PYTHON3
) $< -a
$(AR
) -o
$@
$(filter-out $<, $(real-prereqs
))
1968 $(extmod_prefix
)compile_commands.json
: scripts
/clang-tools
/gen_compile_commands.py \
1969 $(if
$(KBUILD_EXTMOD
),, vmlinux.a
$(KBUILD_VMLINUX_LIBS
)) \
1970 $(if
$(CONFIG_MODULES
), $(MODORDER
)) FORCE
1971 $(call if_changed
,gen_compile_commands
)
1973 targets
+= $(extmod_prefix
)compile_commands.json
1975 PHONY
+= clang-tidy clang-analyzer
1977 ifdef CONFIG_CC_IS_CLANG
1978 quiet_cmd_clang_tools
= CHECK
$<
1979 cmd_clang_tools
= $(PYTHON3
) $(srctree
)/scripts
/clang-tools
/run-clang-tools.py
$@
$<
1981 clang-tidy clang-analyzer
: $(extmod_prefix
)compile_commands.json
1982 $(call cmd
,clang_tools
)
1984 clang-tidy clang-analyzer
:
1985 @echo
"$@ requires CC=clang" >&2
1989 # Scripts to check various things for consistency
1990 # ---------------------------------------------------------------------------
1992 PHONY
+= includecheck versioncheck coccicheck export_report
1995 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1996 -name
'*.[hcS]' -type f
-print |
sort \
1997 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
2000 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
2001 -name
'*.[hcS]' -type f
-print |
sort \
2002 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
2005 $(Q
)$(BASH
) $(srctree
)/scripts
/$@
2008 $(PERL
) $(srctree
)/scripts
/export_report.pl
2010 PHONY
+= checkstack kernelrelease kernelversion image_name
2012 # UML needs a little special treatment here. It wants to use the host
2013 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2014 # else wants $(ARCH), including people doing cross-builds, which means
2015 # that $(SUBARCH) doesn't work here.
2017 CHECKSTACK_ARCH
:= $(SUBARCH
)
2019 CHECKSTACK_ARCH
:= $(ARCH
)
2022 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
2023 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
2026 @
$(filechk_kernel.release
)
2029 @echo
$(KERNELVERSION
)
2032 @echo
$(KBUILD_IMAGE
)
2034 PHONY
+= run-command
2036 $(Q
)$(KBUILD_RUN_COMMAND
)
2038 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
2039 cmd_rmfiles
= rm -rf
$(rm-files
)
2041 # read saved command lines for existing targets
2042 existing-targets
:= $(wildcard $(sort $(targets
)))
2044 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
2046 endif # config-build
2048 endif # need-sub-make
2053 # Declare the contents of the PHONY variable as phony. We keep that
2054 # information in a variable so we can use it in if_changed and friends.