1 # SPDX-License-Identifier: GPL-2.0
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 $(if
$(filter __
%, $(MAKECMDGOALS
)), \
15 $(error targets prefixed with
'__' are only for internal use
))
17 # That's our default target when none is given on the command line
21 # We are using a recursive build, so we need to do a little thinking
22 # to get the ordering right.
24 # Most importantly: sub-Makefiles should only ever modify files in
25 # their own directory. If in some directory we have a dependency on
26 # a file in another dir (which doesn't happen often, but it's often
27 # unavoidable when linking the built-in.a targets which finally
28 # turn into vmlinux), we will call a sub make in that other dir, and
29 # after that we are sure that everything which is in that other dir
32 # The only cases where we need to modify files which have global
33 # effects are thus separated out and done before the recursive
34 # descending is started. They are now explicitly listed as the
37 ifneq ($(sub_make_done
),1)
39 # Do not use make's built-in rules and variables
40 # (this increases performance and avoids hard-to-debug behaviour)
43 # Avoid funny character set dependencies
47 export LC_COLLATE LC_NUMERIC
49 # Avoid interference with shell env settings
53 # ---------------------------------------------------------------------------
55 # Normally, we echo the whole command before executing it. By making
56 # that echo $($(quiet)$(cmd)), we now have the possibility to set
57 # $(quiet) to choose other forms of output instead, e.g.
59 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
62 # If $(quiet) is empty, the whole command will be printed.
63 # If it is set to "quiet_", only the short version will be printed.
64 # If it is set to "silent_", nothing will be printed at all, since
65 # the variable $(silent_cmd_cc_o_c) doesn't exist.
67 # A simple variant is to prefix commands with $(Q) - that's useful
68 # for commands that shall be hidden in non-verbose mode.
72 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
74 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
76 # To put more focus on warnings, be less verbose as default
77 # Use 'make V=1' to see the full commands
79 ifeq ("$(origin V)", "command line")
86 ifeq ($(KBUILD_VERBOSE
),1)
94 # If the user is running make -s (silent mode), suppress echoing of
97 ifneq ($(findstring s
,$(filter-out --%,$(MAKEFLAGS
))),)
102 export quiet Q KBUILD_VERBOSE
104 # Call a source code checker (by default, "sparse") as part of the
107 # Use 'make C=1' to enable checking of only re-compiled files.
108 # Use 'make C=2' to enable checking of *all* source files, regardless
109 # of whether they are re-compiled or not.
111 # See the file "Documentation/dev-tools/sparse.rst" for more details,
112 # including where to get the "sparse" utility.
114 ifeq ("$(origin C)", "command line")
115 KBUILD_CHECKSRC
= $(C
)
117 ifndef KBUILD_CHECKSRC
121 export KBUILD_CHECKSRC
123 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
124 # directory of external module to build. Setting M= takes precedence.
125 ifeq ("$(origin M)", "command line")
126 KBUILD_EXTMOD
:= $(M
)
129 $(if
$(word 2, $(KBUILD_EXTMOD
)), \
130 $(error building multiple external modules is not supported
))
132 # Remove trailing slashes
133 ifneq ($(filter %/, $(KBUILD_EXTMOD
)),)
134 KBUILD_EXTMOD
:= $(shell dirname
$(KBUILD_EXTMOD
).
)
139 # Kbuild will save output files in the current working directory.
140 # This does not need to match to the root of the kernel source tree.
142 # For example, you can do this:
144 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
146 # If you want to save output files in a different location, there are
147 # two syntaxes to specify it.
150 # Use "make O=dir/to/store/output/files/"
152 # 2) Set KBUILD_OUTPUT
153 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
154 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
156 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
159 # Do we want to change the working directory?
160 ifeq ("$(origin O)", "command line")
161 KBUILD_OUTPUT
:= $(O
)
164 ifneq ($(KBUILD_OUTPUT
),)
165 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
166 # expand a shell special character '~'. We use a somewhat tedious way here.
167 abs_objtree
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) && pwd
)
168 $(if
$(abs_objtree
),, \
169 $(error failed to create output directory
"$(KBUILD_OUTPUT)"))
171 # $(realpath ...) resolves symlinks
172 abs_objtree
:= $(realpath
$(abs_objtree
))
174 abs_objtree
:= $(CURDIR
)
175 endif # ifneq ($(KBUILD_OUTPUT),)
177 ifeq ($(abs_objtree
),$(CURDIR
))
178 # Suppress "Entering directory ..." unless we are changing the work directory.
179 MAKEFLAGS
+= --no-print-directory
184 this-makefile
:= $(lastword
$(MAKEFILE_LIST
))
185 abs_srctree
:= $(realpath
$(dir $(this-makefile
)))
187 ifneq ($(words $(subst :, ,$(abs_srctree
))), 1)
188 $(error source directory cannot contain spaces or colons
)
191 ifneq ($(abs_srctree
),$(abs_objtree
))
192 # Look for make include files relative to root of kernel src
194 # --included-dir is added for backward compatibility, but you should not rely on
195 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
196 MAKEFLAGS
+= --include-dir
=$(abs_srctree
)
199 ifneq ($(filter 3.
%,$(MAKE_VERSION
)),)
200 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
201 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
203 # Cancel implicit rules for this Makefile.
207 export abs_srctree abs_objtree
208 export sub_make_done
:= 1
210 ifeq ($(need-sub-make
),1)
212 PHONY
+= $(MAKECMDGOALS
) __sub-make
214 $(filter-out $(this-makefile
), $(MAKECMDGOALS
)) __all
: __sub-make
217 # Invoke a second make in the output directory, passing relevant variables
219 $(Q
)$(MAKE
) -C
$(abs_objtree
) -f
$(abs_srctree
)/Makefile
$(MAKECMDGOALS
)
221 endif # need-sub-make
222 endif # sub_make_done
224 # We process the rest of the Makefile if this is the final invocation of make
225 ifeq ($(need-sub-make
),)
227 # Do not print "Entering directory ...",
228 # but we want to display it when entering to the output directory
229 # so that IDEs/editors are able to understand relative filenames.
230 MAKEFLAGS
+= --no-print-directory
232 ifeq ($(abs_srctree
),$(abs_objtree
))
233 # building in the source tree
235 building_out_of_srctree
:=
237 ifeq ($(abs_srctree
)/,$(dir $(abs_objtree
)))
238 # building in a subdirectory of the source tree
241 srctree
:= $(abs_srctree
)
243 building_out_of_srctree
:= 1
246 ifneq ($(KBUILD_ABS_SRCTREE
),)
247 srctree
:= $(abs_srctree
)
253 export building_out_of_srctree srctree objtree VPATH
255 # To make sure we do not include .config for any of the *config targets
256 # catch them early, and hand them over to scripts/kconfig/Makefile
257 # It is allowed to specify more targets when calling make, including
258 # mixing *config targets and build targets.
259 # For example 'make oldconfig all'.
260 # Detect when mixed targets is specified, and make a second invocation
261 # of make so .config is not included in this case either (for *config).
263 version_h
:= include/generated
/uapi
/linux
/version.h
265 clean-targets
:= %clean mrproper cleandocs
266 no-dot-config-targets
:= $(clean-targets
) \
267 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
268 $(version_h
) headers headers_
% archheaders archscripts \
269 %asm-generic kernelversion
%src-pkg dt_binding_check \
271 # Installation targets should not require compiler. Unfortunately, vdso_install
272 # is an exception where build artifacts may be updated. This must be fixed.
273 no-compiler-targets
:= $(no-dot-config-targets
) install dtbs_install \
274 headers_install modules_install kernelrelease image_name
275 no-sync-config-targets
:= $(no-dot-config-targets
) %install kernelrelease \
277 single-targets
:= %.a
%.i
%.ko
%.lds
%.ll
%.lst
%.mod
%.o
%.s
%.symtypes
%/
286 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
287 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
292 ifneq ($(filter $(no-compiler-targets
), $(MAKECMDGOALS
)),)
293 ifeq ($(filter-out $(no-compiler-targets
), $(MAKECMDGOALS
)),)
298 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
299 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
304 ifneq ($(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
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
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=ia64-linux-
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 KBUILD_USERHOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes \
441 -O2
-fomit-frame-pointer
-std
=gnu11 \
442 -Wdeclaration-after-statement
443 KBUILD_USERCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(USERCFLAGS
)
444 KBUILD_USERLDFLAGS
:= $(USERLDFLAGS
)
446 KBUILD_HOSTCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(HOST_LFS_CFLAGS
) $(HOSTCFLAGS
)
447 KBUILD_HOSTCXXFLAGS
:= -Wall
-O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
448 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
449 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
451 # Make variables (CC, etc...)
454 CC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
455 LD
= $(LLVM_PREFIX
)ld.lld
$(LLVM_SUFFIX
)
456 AR
= $(LLVM_PREFIX
)llvm-ar
$(LLVM_SUFFIX
)
457 NM
= $(LLVM_PREFIX
)llvm-nm
$(LLVM_SUFFIX
)
458 OBJCOPY
= $(LLVM_PREFIX
)llvm-objcopy
$(LLVM_SUFFIX
)
459 OBJDUMP
= $(LLVM_PREFIX
)llvm-objdump
$(LLVM_SUFFIX
)
460 READELF
= $(LLVM_PREFIX
)llvm-readelf
$(LLVM_SUFFIX
)
461 STRIP
= $(LLVM_PREFIX
)llvm-strip
$(LLVM_SUFFIX
)
463 CC
= $(CROSS_COMPILE
)gcc
464 LD
= $(CROSS_COMPILE
)ld
465 AR
= $(CROSS_COMPILE
)ar
466 NM
= $(CROSS_COMPILE
)nm
467 OBJCOPY
= $(CROSS_COMPILE
)objcopy
468 OBJDUMP
= $(CROSS_COMPILE
)objdump
469 READELF
= $(CROSS_COMPILE
)readelf
470 STRIP
= $(CROSS_COMPILE
)strip
473 RESOLVE_BTFIDS
= $(objtree
)/tools
/bpf
/resolve_btfids
/resolve_btfids
477 INSTALLKERNEL
:= installkernel
491 PAHOLE_FLAGS
= $(shell PAHOLE
=$(PAHOLE
) $(srctree
)/scripts
/pahole-flags.sh
)
493 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
494 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
503 # Use USERINCLUDE when you must reference the UAPI directories only.
505 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
506 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
507 -I
$(srctree
)/include/uapi \
508 -I
$(objtree
)/include/generated
/uapi \
509 -include $(srctree
)/include/linux
/compiler-version.h \
510 -include $(srctree
)/include/linux
/kconfig.h
512 # Use LINUXINCLUDE when you must reference the include/ directory.
513 # Needed to be compatible with the O= option
515 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
516 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
517 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
518 -I
$(objtree
)/include \
521 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
522 KBUILD_CFLAGS
:= -Wall
-Wundef
-Werror
=strict-prototypes
-Wno-trigraphs \
523 -fno-strict-aliasing
-fno-common
-fshort-wchar
-fno-PIE \
524 -Werror
=implicit-function-declaration
-Werror
=implicit-int \
525 -Werror
=return-type
-Wno-format-security \
527 KBUILD_CPPFLAGS
:= -D__KERNEL__
528 KBUILD_AFLAGS_KERNEL
:=
529 KBUILD_CFLAGS_KERNEL
:=
530 KBUILD_AFLAGS_MODULE
:= -DMODULE
531 KBUILD_CFLAGS_MODULE
:= -DMODULE
532 KBUILD_LDFLAGS_MODULE
:=
536 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
537 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
538 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
539 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
540 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
541 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
543 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
544 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
545 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
546 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
547 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
550 # Files to ignore in find ... statements
552 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
553 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
555 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
556 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
558 # ===========================================================================
559 # Rules shared between *config targets and build targets
561 # Basic helpers built in scripts/basic/
562 PHONY
+= scripts_basic
564 $(Q
)$(MAKE
) $(build
)=scripts
/basic
566 PHONY
+= outputmakefile
567 ifdef building_out_of_srctree
568 # Before starting out-of-tree build, make sure the source tree is clean.
569 # outputmakefile generates a Makefile in the output directory, if using a
570 # separate output directory. This allows convenient use of make in the
572 # At the same time when output Makefile generated, generate .gitignore to
573 # ignore whole output directory
575 quiet_cmd_makefile
= GEN Makefile
577 echo
"\# Automatically generated by $(srctree)/Makefile: don't edit"; \
578 echo
"include $(srctree)/Makefile"; \
582 $(Q
)if
[ -f
$(srctree
)/.config
-o \
583 -d
$(srctree
)/include/config
-o \
584 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
586 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
587 echo
>&2 "*** in $(abs_srctree)";\
591 $(Q
)ln
-fsn
$(srctree
) source
593 $(Q
)test -e .gitignore || \
594 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
597 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
598 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
599 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
600 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
601 CC_VERSION_TEXT
= $(subst $(pound
),,$(shell LC_ALL
=C
$(CC
) --version
2>/dev
/null | head
-n
1))
603 ifneq ($(findstring clang
,$(CC_VERSION_TEXT
)),)
604 include $(srctree
)/scripts
/Makefile.clang
607 # Include this also for config targets because some architectures need
608 # cc-cross-prefix to determine CROSS_COMPILE.
610 include $(srctree
)/scripts
/Makefile.compiler
614 # ===========================================================================
615 # *config targets only - make sure prerequisites are updated, and descend
616 # in scripts/kconfig to make the *config target
618 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
619 # KBUILD_DEFCONFIG may point out an alternative default configuration
620 # used for 'make defconfig'
621 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
622 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
624 config
: outputmakefile scripts_basic FORCE
625 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
627 %config
: outputmakefile scripts_basic FORCE
628 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
631 # ===========================================================================
632 # Build targets only - this includes vmlinux, arch specific targets, clean
633 # targets and others. In general all targets except *config targets.
635 # If building an external module we do not care about the all: rule
636 # but instead __all depend on modules
638 ifeq ($(KBUILD_EXTMOD
),)
644 # Decide whether to build built-in, modular, or both.
645 # Normally, just do built-in.
650 # If we have only "make modules", don't compile built-in objects.
651 ifeq ($(MAKECMDGOALS
),modules
)
655 # If we have "make <whatever> modules", compile modules
656 # in addition to whatever we do anyway.
657 # Just "make" or "make all" shall build modules as well
659 ifneq ($(filter all modules nsdeps
%compile_commands.json clang-
%,$(MAKECMDGOALS
)),)
663 ifeq ($(MAKECMDGOALS
),)
667 export KBUILD_MODULES KBUILD_BUILTIN
670 include include/config
/auto.conf
673 ifeq ($(KBUILD_EXTMOD
),)
674 # Objects we will link into vmlinux / subdirs we need to visit
675 core-y
:= init
/ usr
/ arch
/$(SRCARCH
)/
676 drivers-y
:= drivers
/ sound
/
677 drivers-
$(CONFIG_SAMPLES
) += samples
/
678 drivers-
$(CONFIG_NET
) += net
/
681 endif # KBUILD_EXTMOD
683 # The all: target is the default when no target is given on the
685 # This allow a user to issue only 'make' to build a kernel including modules
686 # Defaults to vmlinux, but the arch makefile usually adds further targets
689 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
690 ifdef CONFIG_CC_IS_GCC
691 CFLAGS_GCOV
+= -fno-tree-loop-im
695 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
696 ifdef CONFIG_FUNCTION_TRACER
697 CC_FLAGS_FTRACE
:= -pg
700 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
703 ifdef may-sync-config
704 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
705 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
706 # because some architectures define CROSS_COMPILE there.
707 include include/config
/auto.conf.cmd
711 @echo
>&2 '*** Configuration file "$@" not found!'
713 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
714 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
718 # The actual configuration files used during the build are stored in
719 # include/generated/ and include/config/. Update them if .config is newer than
720 # include/config/auto.conf (which mirrors .config).
722 # This exploits the 'multi-target pattern rule' trick.
723 # The syncconfig should be executed only once to make all the targets.
724 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
726 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
727 # so you cannot notice that Kconfig is waiting for the user input.
728 %/config
/auto.conf
%/config
/auto.conf.cmd
%/generated
/autoconf.h
: $(KCONFIG_CONFIG
)
729 $(Q
)$(kecho
) " SYNC $@"
730 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
731 else # !may-sync-config
732 # External modules and some install targets need include/generated/autoconf.h
733 # and include/config/auto.conf but do not care if they are up-to-date.
734 # Use auto.conf to trigger the test
735 PHONY
+= include/config
/auto.conf
737 include/config
/auto.conf
:
738 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
740 echo
>&2 " ERROR: Kernel configuration is invalid."; \
741 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
742 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
746 endif # may-sync-config
749 KBUILD_CFLAGS
+= -fno-delete-null-pointer-checks
750 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
751 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
752 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
753 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
755 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
757 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
759 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
763 # Tell gcc to never replace conditional load with a non-conditional one
764 ifdef CONFIG_CC_IS_GCC
765 # gcc-10 renamed --param=allow-store-data-races=0 to
766 # -fno-allow-store-data-races.
767 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
768 KBUILD_CFLAGS
+= $(call cc-option
,-fno-allow-store-data-races
)
771 ifdef CONFIG_READABLE_ASM
772 # Disable optimizations that make assembler listings hard to read.
773 # reorder blocks reorders the control in the function
774 # ipa clone creates specialized cloned functions
775 # partial inlining inlines only parts of functions
776 KBUILD_CFLAGS
+= -fno-reorder-blocks
-fno-ipa-cp-clone
-fno-partial-inlining
779 ifneq ($(CONFIG_FRAME_WARN
),0)
780 KBUILD_CFLAGS
+= -Wframe-larger-than
=$(CONFIG_FRAME_WARN
)
783 stackp-flags-y
:= -fno-stack-protector
784 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
785 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
787 KBUILD_CFLAGS
+= $(stackp-flags-y
)
789 KBUILD_CFLAGS-
$(CONFIG_WERROR
) += -Werror
790 KBUILD_CFLAGS
+= $(KBUILD_CFLAGS-y
) $(CONFIG_CC_IMPLICIT_FALLTHROUGH
)
792 ifdef CONFIG_CC_IS_CLANG
793 KBUILD_CPPFLAGS
+= -Qunused-arguments
794 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
795 KBUILD_CFLAGS
+= -Wno-gnu
798 # gcc inanely warns about local variables called 'main'
799 KBUILD_CFLAGS
+= -Wno-main
802 # These warnings generated too much noise in a regular build.
803 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
804 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
805 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
807 ifdef CONFIG_FRAME_POINTER
808 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
810 # Some targets (ARM with Thumb2, for example), can't be built with frame
811 # pointers. For those, we don't have FUNCTION_TRACER automatically
812 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
813 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
814 # -fomit-frame-pointer with FUNCTION_TRACER.
815 ifndef CONFIG_FUNCTION_TRACER
816 KBUILD_CFLAGS
+= -fomit-frame-pointer
820 # Initialize all stack variables with a 0xAA pattern.
821 ifdef CONFIG_INIT_STACK_ALL_PATTERN
822 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
825 # Initialize all stack variables with a zero value.
826 ifdef CONFIG_INIT_STACK_ALL_ZERO
827 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=zero
828 ifdef CONFIG_CC_IS_CLANG
829 # https://bugs.llvm.org/show_bug.cgi?id=45497
830 KBUILD_CFLAGS
+= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
834 # While VLAs have been removed, GCC produces unreachable stack probes
835 # for the randomize_kstack_offset feature. Disable it for all compilers.
836 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-clash-protection
)
838 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
839 ifdef CONFIG_ZERO_CALL_USED_REGS
840 KBUILD_CFLAGS
+= -fzero-call-used-regs
=used-gpr
843 ifdef CONFIG_FUNCTION_TRACER
844 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
845 CC_FLAGS_FTRACE
+= -mrecord-mcount
846 ifdef CONFIG_HAVE_NOP_MCOUNT
847 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
848 CC_FLAGS_FTRACE
+= -mnop-mcount
849 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
853 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
854 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
856 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
857 ifdef CONFIG_HAVE_C_RECORDMCOUNT
858 BUILD_C_RECORDMCOUNT
:= y
859 export BUILD_C_RECORDMCOUNT
862 ifdef CONFIG_HAVE_FENTRY
863 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
864 ifeq ($(call cc-option-yn
, -mfentry
),y
)
865 CC_FLAGS_FTRACE
+= -mfentry
866 CC_FLAGS_USING
+= -DCC_USING_FENTRY
869 export CC_FLAGS_FTRACE
870 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
871 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
874 # We trigger additional mismatches with less inlining
875 ifdef CONFIG_DEBUG_SECTION_MISMATCH
876 KBUILD_CFLAGS
+= -fno-inline-functions-called-once
879 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
880 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
881 LDFLAGS_vmlinux
+= --gc-sections
884 ifdef CONFIG_SHADOW_CALL_STACK
885 CC_FLAGS_SCS
:= -fsanitize
=shadow-call-stack
886 KBUILD_CFLAGS
+= $(CC_FLAGS_SCS
)
890 ifdef CONFIG_LTO_CLANG
891 ifdef CONFIG_LTO_CLANG_THIN
892 CC_FLAGS_LTO
:= -flto
=thin
-fsplit-lto-unit
893 KBUILD_LDFLAGS
+= --thinlto-cache-dir
=$(extmod_prefix
).thinlto-cache
895 CC_FLAGS_LTO
:= -flto
897 CC_FLAGS_LTO
+= -fvisibility
=hidden
899 # Limit inlining across translation units to reduce binary size
900 KBUILD_LDFLAGS
+= -mllvm
-import-instr-limit
=5
902 # Check for frame size exceeding threshold during prolog/epilog insertion
903 # when using lld < 13.0.0.
904 ifneq ($(CONFIG_FRAME_WARN
),0)
905 ifeq ($(shell test $(CONFIG_LLD_VERSION
) -lt
130000; echo
$$?
),0)
906 KBUILD_LDFLAGS
+= -plugin-opt
=-warn-stack-size
=$(CONFIG_FRAME_WARN
)
912 KBUILD_CFLAGS
+= -fno-lto
$(CC_FLAGS_LTO
)
913 KBUILD_AFLAGS
+= -fno-lto
917 ifdef CONFIG_CFI_CLANG
918 CC_FLAGS_CFI
:= -fsanitize
=cfi \
919 -fsanitize-cfi-cross-dso \
920 -fno-sanitize-cfi-canonical-jump-tables \
921 -fno-sanitize-trap
=cfi \
922 -fno-sanitize-blacklist
924 ifdef CONFIG_CFI_PERMISSIVE
925 CC_FLAGS_CFI
+= -fsanitize-recover
=cfi
928 # If LTO flags are filtered out, we must also filter out CFI.
929 CC_FLAGS_LTO
+= $(CC_FLAGS_CFI
)
930 KBUILD_CFLAGS
+= $(CC_FLAGS_CFI
)
934 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
935 KBUILD_CFLAGS
+= -falign-functions
=64
938 # arch Makefile may override CC so keep this after arch Makefile is included
939 NOSTDINC_FLAGS
+= -nostdinc
941 # warn about C99 declaration after statement
942 KBUILD_CFLAGS
+= -Wdeclaration-after-statement
944 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
945 KBUILD_CFLAGS
+= -Wvla
947 # disable pointer signed / unsigned warnings in gcc 4.0
948 KBUILD_CFLAGS
+= -Wno-pointer-sign
950 # In order to make sure new function cast mismatches are not introduced
951 # in the kernel (to avoid tripping CFI checking), the kernel should be
952 # globally built with -Wcast-function-type.
953 KBUILD_CFLAGS
+= $(call cc-option
, -Wcast-function-type
)
955 # disable stringop warnings in gcc 8+
956 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
958 # We'll want to enable this eventually, but it's not going away for 5.7 at least
959 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-overflow
)
961 # Another good warning that we'll want to enable eventually
962 KBUILD_CFLAGS
+= $(call cc-disable-warning
, restrict
)
964 # Enabled with W=2, disabled by default as noisy
965 ifdef CONFIG_CC_IS_GCC
966 KBUILD_CFLAGS
+= -Wno-maybe-uninitialized
969 ifdef CONFIG_CC_IS_GCC
970 # The allocators already balk at large sizes, so silence the compiler
971 # warnings for bounds checks involving those possible values. While
972 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
973 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
974 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
975 # doesn't work (as it is documented to), silently resolving to "0" prior to
976 # version 9.1 (and producing an error more recently). Numeric values larger
977 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
978 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
979 # choice, we must perform a versioned check to disable this warning.
980 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
981 KBUILD_CFLAGS
+= $(call cc-ifversion
, -ge
, 0901, -Wno-alloc-size-larger-than
)
984 # disable invalid "can't wrap" optimizations for signed / pointers
985 KBUILD_CFLAGS
+= -fno-strict-overflow
987 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
988 KBUILD_CFLAGS
+= -fno-stack-check
990 # conserve stack if available
991 ifdef CONFIG_CC_IS_GCC
992 KBUILD_CFLAGS
+= -fconserve-stack
995 # Prohibit date/time macros, which would make the build non-deterministic
996 KBUILD_CFLAGS
+= -Werror
=date-time
998 # enforce correct pointer usage
999 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
1001 # Require designated initializers for all marked structures
1002 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
1004 # change __FILE__ to the relative path from the srctree
1005 KBUILD_CPPFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
1007 # include additional Makefiles when needed
1008 include-y
:= scripts
/Makefile.extrawarn
1009 include-
$(CONFIG_DEBUG_INFO
) += scripts
/Makefile.debug
1010 include-
$(CONFIG_KASAN
) += scripts
/Makefile.kasan
1011 include-
$(CONFIG_KCSAN
) += scripts
/Makefile.kcsan
1012 include-
$(CONFIG_UBSAN
) += scripts
/Makefile.ubsan
1013 include-
$(CONFIG_KCOV
) += scripts
/Makefile.kcov
1014 include-
$(CONFIG_GCC_PLUGINS
) += scripts
/Makefile.gcc-plugins
1016 include $(addprefix $(srctree
)/, $(include-y
))
1018 # scripts/Makefile.gcc-plugins is intentionally included last.
1019 # Do not add $(call cc-option,...) below this line. When you build the kernel
1020 # from the clean source tree, the GCC plugins do not exist at this point.
1022 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1023 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
1024 KBUILD_AFLAGS
+= $(KAFLAGS
)
1025 KBUILD_CFLAGS
+= $(KCFLAGS
)
1027 KBUILD_LDFLAGS_MODULE
+= --build-id
=sha1
1028 LDFLAGS_vmlinux
+= --build-id
=sha1
1030 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
1031 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
1034 ifeq ($(CONFIG_RELR
),y
)
1035 LDFLAGS_vmlinux
+= --pack-dyn-relocs
=relr
--use-android-relr-tags
1038 # We never want expected sections to be placed heuristically by the
1039 # linker. All sections should be explicitly named in the linker script.
1040 ifdef CONFIG_LD_ORPHAN_WARN
1041 LDFLAGS_vmlinux
+= --orphan-handling
=warn
1044 # Align the bit size of userspace programs with the kernel
1045 KBUILD_USERCFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1046 KBUILD_USERLDFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1048 # make the checker run with the right architecture
1049 CHECKFLAGS
+= --arch
=$(ARCH
)
1051 # insure the checker run with the right endianness
1052 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
1054 # the checker needs the correct machine size
1055 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
1057 # Default kernel image to build when no specific target is given.
1058 # KBUILD_IMAGE may be overruled on the command line or
1059 # set in the environment
1060 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1061 # this default value
1062 export KBUILD_IMAGE ?
= vmlinux
1065 # INSTALL_PATH specifies where to place the updated kernel and system map
1066 # images. Default is /boot, but you can set it to other values
1067 export INSTALL_PATH ?
= /boot
1070 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1071 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1072 # an argument if needed. Otherwise it defaults to the kernel install path
1074 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
1077 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1078 # relocations required by build roots. This is not defined in the
1079 # makefile but the argument can be passed to make if needed.
1082 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
1087 export extmod_prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
1088 export MODORDER
:= $(extmod_prefix
)modules.order
1089 export MODULES_NSDEPS
:= $(extmod_prefix
)modules.nsdeps
1091 ifeq ($(KBUILD_EXTMOD
),)
1092 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/
1093 core-
$(CONFIG_BLOCK
) += block
/
1095 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, \
1096 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
1097 $(libs-y
) $(libs-m
)))
1099 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) Documentation \
1100 $(patsubst %/,%,$(filter %/, $(core-
) \
1101 $(drivers-
) $(libs-
))))
1103 subdir-modorder
:= $(addsuffix modules.order
,$(filter %/, \
1104 $(core-y
) $(core-m
) $(libs-y
) $(libs-m
) \
1105 $(drivers-y
) $(drivers-m
)))
1107 build-dirs
:= $(vmlinux-dirs
)
1108 clean-dirs
:= $(vmlinux-alldirs
)
1110 # Externally visible symbols (used by link-vmlinux.sh)
1111 KBUILD_VMLINUX_OBJS
:= $(head-y
) $(patsubst %/,%/built-in.a
, $(core-y
))
1112 KBUILD_VMLINUX_OBJS
+= $(addsuffix built-in.a
, $(filter %/, $(libs-y
)))
1113 ifdef CONFIG_MODULES
1114 KBUILD_VMLINUX_OBJS
+= $(patsubst %/, %/lib.a
, $(filter %/, $(libs-y
)))
1115 KBUILD_VMLINUX_LIBS
:= $(filter-out %/, $(libs-y
))
1117 KBUILD_VMLINUX_LIBS
:= $(patsubst %/,%/lib.a
, $(libs-y
))
1119 KBUILD_VMLINUX_OBJS
+= $(patsubst %/,%/built-in.a
, $(drivers-y
))
1121 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1122 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1123 # used by scripts/Makefile.package
1124 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) LICENSES arch
include scripts tools
)
1126 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)
1128 # Recurse until adjust_autoksyms.sh is satisfied
1129 PHONY
+= autoksyms_recursive
1130 ifdef CONFIG_TRIM_UNUSED_KSYMS
1131 # For the kernel to actually contain only the needed exported symbols,
1132 # we have to build modules as well to determine what those symbols are.
1133 # (this can be evaluated only once include/config/auto.conf has been included)
1136 autoksyms_recursive
: descend modules.order
1137 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1138 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1141 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1143 quiet_cmd_autoksyms_h
= GEN
$@
1144 cmd_autoksyms_h
= mkdir
-p
$(dir $@
); \
1145 $(CONFIG_SHELL
) $(srctree
)/scripts
/gen_autoksyms.sh
$@
1148 $(call cmd
,autoksyms_h
)
1150 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1152 # Final link of vmlinux with optional arch pass after final link
1153 cmd_link-vmlinux
= \
1154 $(CONFIG_SHELL
) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1155 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1157 vmlinux
: scripts
/link-vmlinux.sh autoksyms_recursive
$(vmlinux-deps
) FORCE
1158 +$(call if_changed_dep
,link-vmlinux
)
1162 # The actual objects are generated when descending,
1163 # make sure no implicit rule kicks in
1164 $(sort $(vmlinux-deps
) $(subdir-modorder
)): descend
;
1166 filechk_kernel.release
= \
1167 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1169 # Store (new) KERNELRELEASE string in include/config/kernel.release
1170 include/config
/kernel.release
: FORCE
1171 $(call filechk
,kernel.release
)
1173 # Additional helpers built in scripts/
1174 # Carefully list dependencies so we do not try to build scripts twice
1177 scripts
: scripts_basic scripts_dtc
1178 $(Q
)$(MAKE
) $(build
)=$(@
)
1180 # Things we need to do before we recursively start building the kernel
1181 # or the modules are listed in "prepare".
1182 # A multi level approach is used. prepareN is processed before prepareN-1.
1183 # archprepare is used in arch Makefiles and when processed asm symlink,
1184 # version.h and scripts_basic is processed / created.
1186 PHONY
+= prepare archprepare
1188 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1189 asm-generic
$(version_h
) $(autoksyms_h
) include/generated
/utsrelease.h \
1190 include/generated
/autoconf.h remove-stale-files
1192 prepare0
: archprepare
1193 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1194 $(Q
)$(MAKE
) $(build
)=.
1196 # All the preparing..
1199 PHONY
+= remove-stale-files
1201 $(Q
)$(srctree
)/scripts
/remove-stale-files
1203 # Support for using generic headers in asm-generic
1204 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1206 PHONY
+= asm-generic uapi-asm-generic
1207 asm-generic
: uapi-asm-generic
1208 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1209 generic
=include/asm-generic
1211 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1212 generic
=include/uapi
/asm-generic
1214 # Generate some files
1215 # ---------------------------------------------------------------------------
1217 # KERNELRELEASE can change from a few different places, meaning version.h
1218 # needs to be updated, so this check is forced on all builds
1221 define filechk_utsrelease.h
1222 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1223 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1226 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1229 define filechk_version.h
1230 if
[ $(SUBLEVEL
) -gt
255 ]; then \
1231 echo \
#define LINUX_VERSION_CODE $(shell \
1232 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + 255); \
1234 echo \
#define LINUX_VERSION_CODE $(shell \
1235 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
1237 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1238 ((c) > 255 ? 255 : (c)))'; \
1239 echo \
#define LINUX_VERSION_MAJOR $(VERSION); \
1240 echo \
#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1241 echo \
#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1244 $(version_h
): PATCHLEVEL
:= $(or
$(PATCHLEVEL
), 0)
1245 $(version_h
): SUBLEVEL
:= $(or
$(SUBLEVEL
), 0)
1247 $(call filechk
,version.h
)
1249 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1250 $(call filechk
,utsrelease.h
)
1254 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1255 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1257 # ---------------------------------------------------------------------------
1260 #Default location for installed headers
1261 export INSTALL_HDR_PATH
= $(objtree
)/usr
1263 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1264 cmd_headers_install
= \
1265 mkdir
-p
$(INSTALL_HDR_PATH
); \
1266 rsync
-mrl
--include='*/' --include='*\.h' --exclude
='*' \
1267 usr
/include $(INSTALL_HDR_PATH
)
1269 PHONY
+= headers_install
1270 headers_install
: headers
1271 $(call cmd
,headers_install
)
1273 PHONY
+= archheaders archscripts
1275 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1278 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1279 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1280 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1281 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1282 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1284 ifdef CONFIG_HEADERS_INSTALL
1288 PHONY
+= scripts_unifdef
1289 scripts_unifdef
: scripts_basic
1290 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1292 # ---------------------------------------------------------------------------
1295 # Many distributions have the custom install script, /sbin/installkernel.
1296 # If DKMS is installed, 'make install' will eventually recuses back
1297 # to the this Makefile to build and install external modules.
1298 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1300 install: sub_make_done
:=
1302 # ---------------------------------------------------------------------------
1305 ifdef CONFIG_STACK_VALIDATION
1306 prepare
: tools
/objtool
1310 ifdef CONFIG_DEBUG_INFO_BTF
1311 prepare
: tools
/bpf
/resolve_btfids
1315 PHONY
+= resolve_btfids_clean
1317 resolve_btfids_O
= $(abspath
$(objtree
))/tools
/bpf
/resolve_btfids
1319 # tools/bpf/resolve_btfids directory might not exist
1320 # in output directory, skip its clean in that case
1321 resolve_btfids_clean
:
1322 ifneq ($(wildcard $(resolve_btfids_O
)),)
1323 $(Q
)$(MAKE
) -sC
$(srctree
)/tools
/bpf
/resolve_btfids O
=$(resolve_btfids_O
) clean
1326 # Clear a bunch of variables before executing the submake
1327 ifeq ($(quiet
),silent_
)
1332 $(Q
)mkdir
-p
$(objtree
)/tools
1333 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1336 $(Q
)mkdir
-p
$(objtree
)/tools
1337 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1339 # ---------------------------------------------------------------------------
1344 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1347 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1349 PHONY
+= kselftest-merge
1351 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1352 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config | \
1353 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-m
$(objtree
)/.config
1354 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1356 # ---------------------------------------------------------------------------
1359 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1360 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1365 %.dtb
: include/config
/kernel.release scripts_dtc
1366 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1368 %.dtbo
: include/config
/kernel.release scripts_dtc
1369 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1371 PHONY
+= dtbs dtbs_install dtbs_check
1372 dtbs
: include/config
/kernel.release scripts_dtc
1373 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1375 ifneq ($(filter dtbs_check
, $(MAKECMDGOALS
)),)
1377 dtbs
: dt_binding_check
1383 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
) dst
=$(INSTALL_DTBS_PATH
)
1385 ifdef CONFIG_OF_EARLY_FLATTREE
1391 PHONY
+= scripts_dtc
1392 scripts_dtc
: scripts_basic
1393 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1395 ifneq ($(filter dt_binding_check
, $(MAKECMDGOALS
)),)
1396 export CHECK_DT_BINDING
=y
1399 PHONY
+= dt_binding_check
1400 dt_binding_check
: scripts_dtc
1401 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1403 # ---------------------------------------------------------------------------
1406 ifdef CONFIG_MODULES
1408 # By default, build modules as well
1412 # When we're building modules with modversions, we need to consider
1413 # the built-in objects during the descend as well, in order to
1414 # make sure the checksums are up to date before we record them.
1415 ifdef CONFIG_MODVERSIONS
1421 # A module can be listed more than once in obj-m resulting in
1422 # duplicate lines in modules.order files. Those are removed
1423 # using awk while concatenating to the final file.
1426 modules
: $(if
$(KBUILD_BUILTIN
),vmlinux
) modules_check modules_prepare
1428 cmd_modules_order
= $(AWK
) '!x[$$0]++' $(real-prereqs
) > $@
1430 modules.order
: $(subdir-modorder
) FORCE
1431 $(call if_changed
,modules_order
)
1433 targets
+= modules.order
1435 # Target to prepare building external modules
1436 PHONY
+= modules_prepare
1437 modules_prepare
: prepare
1438 $(Q
)$(MAKE
) $(build
)=scripts scripts
/module.lds
1440 export modules_sign_only
:=
1442 ifeq ($(CONFIG_MODULE_SIG
),y
)
1443 PHONY
+= modules_sign
1444 modules_sign
: modules_install
1447 # modules_sign is a subset of modules_install.
1448 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1449 ifeq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1450 modules_sign_only
:= y
1455 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1456 modinst_pre
:= __modinst_pre
1459 modules_install
: $(modinst_pre
)
1460 PHONY
+= __modinst_pre
1462 @
rm -rf
$(MODLIB
)/kernel
1463 @
rm -f
$(MODLIB
)/source
1464 @mkdir
-p
$(MODLIB
)/kernel
1465 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1466 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1467 rm -f
$(MODLIB
)/build
; \
1468 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1470 @sed
's:^:kernel/:' modules.order
> $(MODLIB
)/modules.order
1471 @cp
-f modules.builtin
$(MODLIB
)/
1472 @cp
-f
$(objtree
)/modules.builtin.modinfo
$(MODLIB
)/
1474 endif # CONFIG_MODULES
1477 # Cleaning is done on three levels.
1478 # make clean Delete most generated files
1479 # Leave enough to build external modules
1480 # make mrproper Delete the current configuration, and all generated files
1481 # make distclean Remove editor backup files, patch leftover files and the like
1483 # Directories & files removed with 'make clean'
1484 CLEAN_FILES
+= include/ksym vmlinux.symvers modules-only.symvers \
1485 modules.builtin modules.builtin.modinfo modules.nsdeps \
1486 compile_commands.json .thinlto-cache
1488 # Directories & files removed with 'make mrproper'
1489 MRPROPER_FILES
+= include/config
include/generated \
1490 arch
/$(SRCARCH
)/include/generated .tmp_objdiff \
1491 debian snap tar-install \
1492 .config .config.old .version \
1494 certs
/signing_key.pem \
1499 # clean - Delete most, but leave enough to build external modules
1501 clean: rm-files
:= $(CLEAN_FILES
)
1503 PHONY
+= archclean vmlinuxclean
1506 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1507 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1509 clean: archclean vmlinuxclean resolve_btfids_clean
1511 # mrproper - Delete all generated files, including .config
1513 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1514 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1516 PHONY
+= $(mrproper-dirs
) mrproper
1518 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1520 mrproper
: clean $(mrproper-dirs
)
1528 @find .
$(RCS_FIND_IGNORE
) \
1529 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1530 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1531 -o
-name
'core' -o
-name
tags -o
-name TAGS
-o
-name
'cscope*' \
1532 -o
-name GPATH
-o
-name GRTAGS
-o
-name GSYMS
-o
-name GTAGS \
) \
1533 -type f
-print | xargs
rm -f
1536 # Packaging of the kernel to various formats
1537 # ---------------------------------------------------------------------------
1540 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1541 %pkg
: include/config
/kernel.release FORCE
1542 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1544 # Brief documentation of the typical targets used
1545 # ---------------------------------------------------------------------------
1547 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1548 boards
:= $(sort $(notdir $(boards
)))
1549 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1550 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1554 @echo
'Cleaning targets:'
1555 @echo
' clean - Remove most generated files but keep the config and'
1556 @echo
' enough build support to build external modules'
1557 @echo
' mrproper - Remove all generated files + config + various backup files'
1558 @echo
' distclean - mrproper + remove editor backup and patch files'
1560 @echo
'Configuration targets:'
1561 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1563 @echo
'Other generic targets:'
1564 @echo
' all - Build all targets marked with [*]'
1565 @echo
'* vmlinux - Build the bare kernel'
1566 @echo
'* modules - Build all modules'
1567 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1568 @echo
' dir/ - Build all files in dir and below'
1569 @echo
' dir/file.[ois] - Build specified target only'
1570 @echo
' dir/file.ll - Build the LLVM assembly file'
1571 @echo
' (requires compiler support for LLVM assembly generation)'
1572 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1573 @echo
' (requires a recent binutils and recent build (System.map))'
1574 @echo
' dir/file.ko - Build module including final link'
1575 @echo
' modules_prepare - Set up for building external modules'
1576 @echo
' tags/TAGS - Generate tags file for editors'
1577 @echo
' cscope - Generate cscope index'
1578 @echo
' gtags - Generate GNU GLOBAL index'
1579 @echo
' kernelrelease - Output the release version string (use with make -s)'
1580 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1581 @echo
' image_name - Output the image name (use with make -s)'
1582 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1583 echo
' (default: $(INSTALL_HDR_PATH))'; \
1585 @echo
'Static analysers:'
1586 @echo
' checkstack - Generate a list of stack hogs'
1587 @echo
' versioncheck - Sanity check on version.h usage'
1588 @echo
' includecheck - Check for duplicate included header files'
1589 @echo
' export_report - List the usages of all exported symbols'
1590 @echo
' headerdep - Detect inclusion cycles in headers'
1591 @echo
' coccicheck - Check with Coccinelle'
1592 @echo
' clang-analyzer - Check with clang static analyzer'
1593 @echo
' clang-tidy - Check with clang-tidy'
1596 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1598 @echo
'Kernel selftest:'
1599 @echo
' kselftest - Build and run kernel selftest'
1600 @echo
' Build, install, and boot kernel before'
1601 @echo
' running kselftest on it'
1602 @echo
' Run as root for full coverage'
1603 @echo
' kselftest-all - Build kernel selftest'
1604 @echo
' kselftest-install - Build and install kernel selftest'
1605 @echo
' kselftest-clean - Remove all generated kselftest files'
1606 @echo
' kselftest-merge - Merge all the config dependencies of'
1607 @echo
' kselftest to existing .config.'
1610 echo
'Devicetree:'; \
1611 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1612 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1613 echo
' dt_binding_check - Validate device tree binding documents'; \
1614 echo
' dtbs_check - Validate device tree source files';\
1617 @echo
'Userspace tools targets:'
1618 @echo
' use "make tools/help"'
1619 @echo
' or "cd tools; make help"'
1621 @echo
'Kernel packaging:'
1622 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1624 @echo
'Documentation targets:'
1625 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1627 @echo
'Architecture specific targets ($(SRCARCH)):'
1629 echo
' No architecture specific help defined for $(SRCARCH)')
1632 $(foreach b
, $(boards
), \
1633 printf
" %-27s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1635 @
$(if
$(board-dirs
), \
1636 $(foreach b
, $(board-dirs
), \
1637 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1638 printf
" %-16s - Show all of the above\\n" help-boards
; \
1641 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1642 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1643 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1644 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK'
1645 @echo
' (sparse by default)'
1646 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1647 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1648 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1649 @echo
' 1: warnings which may be relevant and do not occur too often'
1650 @echo
' 2: warnings which occur quite often but may still be relevant'
1651 @echo
' 3: more obscure warnings, can most likely be ignored'
1652 @echo
' Multiple levels can be combined with W=12 or W=123'
1654 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1655 @echo
'For further info see the ./README file'
1658 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1660 help-boards
: $(help-board-dirs
)
1662 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1664 $(help-board-dirs
): help-
%:
1665 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1666 @
$(if
$(boards-per-dir
), \
1667 $(foreach b
, $(boards-per-dir
), \
1668 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1672 # Documentation targets
1673 # ---------------------------------------------------------------------------
1674 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1675 linkcheckdocs dochelp refcheckdocs
1676 PHONY
+= $(DOC_TARGETS
)
1678 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1681 # ---------------------------------------------------------------------------
1683 PHONY
+= scripts_gdb
1684 scripts_gdb
: prepare0
1685 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1686 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1688 ifdef CONFIG_GDB_SCRIPTS
1692 else # KBUILD_EXTMOD
1695 # External module support.
1696 # When building external modules the kernel used as basis is considered
1697 # read-only, and no consistency checks are made and the make
1698 # system is not used on the basis kernel. If updates are required
1699 # in the basis kernel ordinary make commands (without M=...) must be used.
1701 # We are always building only modules.
1705 build-dirs
:= $(KBUILD_EXTMOD
)
1706 $(MODORDER
): descend
1709 compile_commands.json
: $(extmod_prefix
)compile_commands.json
1710 PHONY
+= compile_commands.json
1712 clean-dirs
:= $(KBUILD_EXTMOD
)
1713 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
$(KBUILD_EXTMOD
)/modules.nsdeps \
1714 $(KBUILD_EXTMOD
)/compile_commands.json
$(KBUILD_EXTMOD
)/.thinlto-cache
1717 # now expand this into a simple variable to reduce the cost of shell evaluations
1718 prepare
: CC_VERSION_TEXT
:= $(CC_VERSION_TEXT
)
1720 @if
[ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1721 echo
>&2 "warning: the compiler differs from the one used to build the kernel"; \
1722 echo
>&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1723 echo
>&2 " You are using: $(CC_VERSION_TEXT)"; \
1728 @echo
' Building external modules.'
1729 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1731 @echo
' modules - default target, build the module(s)'
1732 @echo
' modules_install - install the module'
1733 @echo
' clean - remove generated files in module directory only'
1736 # no-op for external module builds
1737 PHONY
+= modules_prepare
1739 endif # KBUILD_EXTMOD
1741 # ---------------------------------------------------------------------------
1744 PHONY
+= modules modules_install
1746 ifdef CONFIG_MODULES
1748 modules
: modules_check
1749 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1751 PHONY
+= modules_check
1752 modules_check
: $(MODORDER
)
1753 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
$<
1755 quiet_cmd_depmod
= DEPMOD
$(MODLIB
)
1756 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1760 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1763 else # CONFIG_MODULES
1765 # Modules not configured
1766 # ---------------------------------------------------------------------------
1768 modules modules_install
:
1770 @echo
>&2 '*** The present kernel configuration has modules disabled.'
1771 @echo
>&2 '*** To use the module feature, please run "make menuconfig" etc.'
1772 @echo
>&2 '*** to enable CONFIG_MODULES.'
1776 endif # CONFIG_MODULES
1779 # ---------------------------------------------------------------------------
1780 # To build individual files in subdirectories, you can do like this:
1782 # make foo/bar/baz.s
1784 # The supported suffixes for single-target are listed in 'single-targets'
1786 # To build only under specific subdirectories, you can do like this:
1792 # .ko is special because modpost is needed
1793 single-ko
:= $(sort $(filter %.ko
, $(MAKECMDGOALS
)))
1794 single-no-ko
:= $(sort $(patsubst %.ko
,%.mod
, $(MAKECMDGOALS
)))
1796 $(single-ko
): single_modpost
1798 $(single-no-ko
): descend
1801 ifeq ($(KBUILD_EXTMOD
),)
1802 # For the single build of in-tree modules, use a temporary file to avoid
1803 # the situation of modules_install installing an invalid modules.order.
1804 MODORDER
:= .modules.tmp
1807 PHONY
+= single_modpost
1808 single_modpost
: $(single-no-ko
) modules_prepare
1809 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod_prefix
)$m;) } > $(MODORDER
)
1810 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1814 export KBUILD_SINGLE_TARGETS
:= $(addprefix $(extmod_prefix
), $(single-no-ko
))
1816 # trim unrelated directories
1817 build-dirs
:= $(foreach d
, $(build-dirs
), \
1818 $(if
$(filter $(d
)/%, $(KBUILD_SINGLE_TARGETS
)), $(d
)))
1822 ifndef CONFIG_MODULES
1826 # Handle descending into subdirectories listed in $(build-dirs)
1827 # Preset locale variables to speed up the build process. Limit locale
1828 # tweaks to this spot to avoid wrong language settings when running
1829 # make menuconfig etc.
1830 # Error messages still appears in the original language
1831 PHONY
+= descend
$(build-dirs
)
1832 descend
: $(build-dirs
)
1833 $(build-dirs
): prepare
1834 $(Q
)$(MAKE
) $(build
)=$@ \
1835 single-build
=$(if
$(filter-out $@
/, $(filter $@
/%, $(KBUILD_SINGLE_TARGETS
))),1) \
1836 need-builtin
=1 need-modorder
=1
1838 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
1839 PHONY
+= $(clean-dirs
) clean
1841 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1843 clean: $(clean-dirs
)
1845 @find
$(or
$(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1846 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1848 -o
-name
'*.dtb' -o
-name
'*.dtbo' -o
-name
'*.dtb.S' -o
-name
'*.dt.yaml' \
1849 -o
-name
'*.dwo' -o
-name
'*.lst' \
1850 -o
-name
'*.su' -o
-name
'*.mod' \
1851 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1852 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1853 -o
-name
'*.asn1.[ch]' \
1854 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1855 -o
-name
'.tmp_*.o.*' \
1856 -o
-name
'*.c.[012]*.*' \
1859 -o
-name
'*.*.symversions' \
) -type f
-print | xargs
rm -f
1861 # Generate tags for editors
1862 # ---------------------------------------------------------------------------
1863 quiet_cmd_tags
= GEN
$@
1864 cmd_tags
= $(BASH
) $(srctree
)/scripts
/tags.sh
$@
1866 tags TAGS cscope gtags
: FORCE
1869 # Script to generate missing namespace dependencies
1870 # ---------------------------------------------------------------------------
1873 nsdeps
: export KBUILD_NSDEPS
=1
1875 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/nsdeps
1878 # ---------------------------------------------------------------------------
1880 quiet_cmd_gen_compile_commands
= GEN
$@
1881 cmd_gen_compile_commands
= $(PYTHON3
) $< -a
$(AR
) -o
$@
$(filter-out $<, $(real-prereqs
))
1883 $(extmod_prefix
)compile_commands.json
: scripts
/clang-tools
/gen_compile_commands.py \
1884 $(if
$(KBUILD_EXTMOD
),,$(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)) \
1885 $(if
$(CONFIG_MODULES
), $(MODORDER
)) FORCE
1886 $(call if_changed
,gen_compile_commands
)
1888 targets
+= $(extmod_prefix
)compile_commands.json
1890 PHONY
+= clang-tidy clang-analyzer
1892 ifdef CONFIG_CC_IS_CLANG
1893 quiet_cmd_clang_tools
= CHECK
$<
1894 cmd_clang_tools
= $(PYTHON3
) $(srctree
)/scripts
/clang-tools
/run-clang-tools.py
$@
$<
1896 clang-tidy clang-analyzer
: $(extmod_prefix
)compile_commands.json
1897 $(call cmd
,clang_tools
)
1899 clang-tidy clang-analyzer
:
1900 @echo
"$@ requires CC=clang" >&2
1904 # Scripts to check various things for consistency
1905 # ---------------------------------------------------------------------------
1907 PHONY
+= includecheck versioncheck coccicheck export_report
1910 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1911 -name
'*.[hcS]' -type f
-print |
sort \
1912 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1915 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1916 -name
'*.[hcS]' -type f
-print |
sort \
1917 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1920 $(Q
)$(BASH
) $(srctree
)/scripts
/$@
1923 $(PERL
) $(srctree
)/scripts
/export_report.pl
1925 PHONY
+= checkstack kernelrelease kernelversion image_name
1927 # UML needs a little special treatment here. It wants to use the host
1928 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1929 # else wants $(ARCH), including people doing cross-builds, which means
1930 # that $(SUBARCH) doesn't work here.
1932 CHECKSTACK_ARCH
:= $(SUBARCH
)
1934 CHECKSTACK_ARCH
:= $(ARCH
)
1937 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1938 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1941 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1944 @echo
$(KERNELVERSION
)
1947 @echo
$(KBUILD_IMAGE
)
1949 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1950 cmd_rmfiles
= rm -rf
$(rm-files
)
1952 # read saved command lines for existing targets
1953 existing-targets
:= $(wildcard $(sort $(targets
)))
1955 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
1957 endif # config-build
1959 endif # need-sub-make
1964 # Declare the contents of the PHONY variable as phony. We keep that
1965 # information in a variable so we can use it in if_changed and friends.