1 # SPDX-License-Identifier: GPL-2.0
6 NAME
= Frozen Wasteland
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 $(error building multiple external modules is not supported
))
134 # Kbuild will save output files in the current working directory.
135 # This does not need to match to the root of the kernel source tree.
137 # For example, you can do this:
139 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
141 # If you want to save output files in a different location, there are
142 # two syntaxes to specify it.
145 # Use "make O=dir/to/store/output/files/"
147 # 2) Set KBUILD_OUTPUT
148 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
149 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
151 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
154 # Do we want to change the working directory?
155 ifeq ("$(origin O)", "command line")
156 KBUILD_OUTPUT
:= $(O
)
159 ifneq ($(KBUILD_OUTPUT
),)
160 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
161 # expand a shell special character '~'. We use a somewhat tedious way here.
162 abs_objtree
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) && pwd
)
163 $(if
$(abs_objtree
),, \
164 $(error failed to create output directory
"$(KBUILD_OUTPUT)"))
166 # $(realpath ...) resolves symlinks
167 abs_objtree
:= $(realpath
$(abs_objtree
))
169 abs_objtree
:= $(CURDIR
)
170 endif # ifneq ($(KBUILD_OUTPUT),)
172 ifeq ($(abs_objtree
),$(CURDIR
))
173 # Suppress "Entering directory ..." unless we are changing the work directory.
174 MAKEFLAGS
+= --no-print-directory
179 this-makefile
:= $(lastword
$(MAKEFILE_LIST
))
180 abs_srctree
:= $(realpath
$(dir $(this-makefile
)))
182 ifneq ($(words $(subst :, ,$(abs_srctree
))), 1)
183 $(error source directory cannot contain spaces or colons
)
186 ifneq ($(abs_srctree
),$(abs_objtree
))
187 # Look for make include files relative to root of kernel src
189 # This does not become effective immediately because MAKEFLAGS is re-parsed
190 # once after the Makefile is read. We need to invoke sub-make.
191 MAKEFLAGS
+= --include-dir
=$(abs_srctree
)
195 ifneq ($(filter 3.
%,$(MAKE_VERSION
)),)
196 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
197 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
199 # Cancel implicit rules for this Makefile.
203 export abs_srctree abs_objtree
204 export sub_make_done
:= 1
206 ifeq ($(need-sub-make
),1)
208 PHONY
+= $(MAKECMDGOALS
) __sub-make
210 $(filter-out $(this-makefile
), $(MAKECMDGOALS
)) __all
: __sub-make
213 # Invoke a second make in the output directory, passing relevant variables
215 $(Q
)$(MAKE
) -C
$(abs_objtree
) -f
$(abs_srctree
)/Makefile
$(MAKECMDGOALS
)
217 endif # need-sub-make
218 endif # sub_make_done
220 # We process the rest of the Makefile if this is the final invocation of make
221 ifeq ($(need-sub-make
),)
223 # Do not print "Entering directory ...",
224 # but we want to display it when entering to the output directory
225 # so that IDEs/editors are able to understand relative filenames.
226 MAKEFLAGS
+= --no-print-directory
228 ifeq ($(abs_srctree
),$(abs_objtree
))
229 # building in the source tree
231 building_out_of_srctree
:=
233 ifeq ($(abs_srctree
)/,$(dir $(abs_objtree
)))
234 # building in a subdirectory of the source tree
237 srctree
:= $(abs_srctree
)
239 building_out_of_srctree
:= 1
242 ifneq ($(KBUILD_ABS_SRCTREE
),)
243 srctree
:= $(abs_srctree
)
249 export building_out_of_srctree srctree objtree VPATH
251 # To make sure we do not include .config for any of the *config targets
252 # catch them early, and hand them over to scripts/kconfig/Makefile
253 # It is allowed to specify more targets when calling make, including
254 # mixing *config targets and build targets.
255 # For example 'make oldconfig all'.
256 # Detect when mixed targets is specified, and make a second invocation
257 # of make so .config is not included in this case either (for *config).
259 version_h
:= include/generated
/uapi
/linux
/version.h
261 clean-targets
:= %clean mrproper cleandocs
262 no-dot-config-targets
:= $(clean-targets
) \
263 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
264 $(version_h
) headers headers_
% archheaders archscripts \
265 %asm-generic kernelversion
%src-pkg dt_binding_check \
267 # Installation targets should not require compiler. Unfortunately, vdso_install
268 # is an exception where build artifacts may be updated. This must be fixed.
269 no-compiler-targets
:= $(no-dot-config-targets
) install dtbs_install \
270 headers_install modules_install kernelrelease image_name
271 no-sync-config-targets
:= $(no-dot-config-targets
) %install kernelrelease \
273 single-targets
:= %.a
%.i
%.ko
%.lds
%.ll
%.lst
%.mod
%.o
%.s
%.symtypes
%/
282 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
283 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
288 ifneq ($(filter $(no-compiler-targets
), $(MAKECMDGOALS
)),)
289 ifeq ($(filter-out $(no-compiler-targets
), $(MAKECMDGOALS
)),)
294 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
295 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
300 ifneq ($(KBUILD_EXTMOD
),)
304 ifeq ($(KBUILD_EXTMOD
),)
305 ifneq ($(filter %config
,$(MAKECMDGOALS
)),)
307 ifneq ($(words $(MAKECMDGOALS
)),1)
313 # We cannot build single targets and the others at the same time
314 ifneq ($(filter $(single-targets
), $(MAKECMDGOALS
)),)
316 ifneq ($(filter-out $(single-targets
), $(MAKECMDGOALS
)),)
321 # For "make -j clean all", "make -j mrproper defconfig all", etc.
322 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
323 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
328 # install and modules_install need also be processed one by one
329 ifneq ($(filter install,$(MAKECMDGOALS
)),)
330 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
336 # ===========================================================================
337 # We're called with mixed targets (*config and build targets).
338 # Handle them one by one.
340 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
342 $(MAKECMDGOALS
): __build_one_by_one
347 for i in
$(MAKECMDGOALS
); do \
348 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
353 include $(srctree
)/scripts
/Kbuild.
include
355 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
356 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
357 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
358 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
360 include $(srctree
)/scripts
/subarch.
include
362 # Cross compiling and selecting different set of gcc/bin-utils
363 # ---------------------------------------------------------------------------
365 # When performing cross compilation for other architectures ARCH shall be set
366 # to the target architecture. (See arch/* for the possibilities).
367 # ARCH can be set during invocation of make:
369 # Another way is to have ARCH set in the environment.
370 # The default ARCH is the host where make is executed.
372 # CROSS_COMPILE specify the prefix used for all executables used
373 # during compilation. Only gcc and related bin-utils executables
374 # are prefixed with $(CROSS_COMPILE).
375 # CROSS_COMPILE can be set on the command line
376 # make CROSS_COMPILE=ia64-linux-
377 # Alternatively CROSS_COMPILE can be set in the environment.
378 # Default value for CROSS_COMPILE is not to prefix executables
379 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
382 # Architecture as present in compile.h
383 UTS_MACHINE
:= $(ARCH
)
386 # Additional ARCH settings for x86
390 ifeq ($(ARCH
),x86_64
)
394 # Additional ARCH settings for sparc
395 ifeq ($(ARCH
),sparc32
)
398 ifeq ($(ARCH
),sparc64
)
402 export cross_compiling
:=
403 ifneq ($(SRCARCH
),$(SUBARCH
))
407 KCONFIG_CONFIG ?
= .config
408 export KCONFIG_CONFIG
410 # SHELL used by kbuild
413 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
414 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
415 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
425 export KBUILD_USERCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes \
426 -O2
-fomit-frame-pointer
-std
=gnu89
427 export KBUILD_USERLDFLAGS
:=
429 KBUILD_HOSTCFLAGS
:= $(KBUILD_USERCFLAGS
) $(HOST_LFS_CFLAGS
) $(HOSTCFLAGS
)
430 KBUILD_HOSTCXXFLAGS
:= -Wall
-O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
431 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
432 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
434 # Make variables (CC, etc...)
441 OBJCOPY
= llvm-objcopy
442 OBJDUMP
= llvm-objdump
443 READELF
= llvm-readelf
446 CC
= $(CROSS_COMPILE
)gcc
447 LD
= $(CROSS_COMPILE
)ld
448 AR
= $(CROSS_COMPILE
)ar
449 NM
= $(CROSS_COMPILE
)nm
450 OBJCOPY
= $(CROSS_COMPILE
)objcopy
451 OBJDUMP
= $(CROSS_COMPILE
)objdump
452 READELF
= $(CROSS_COMPILE
)readelf
453 STRIP
= $(CROSS_COMPILE
)strip
456 RESOLVE_BTFIDS
= $(objtree
)/tools
/bpf
/resolve_btfids
/resolve_btfids
460 INSTALLKERNEL
:= installkernel
474 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
475 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
484 # Use USERINCLUDE when you must reference the UAPI directories only.
486 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
487 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
488 -I
$(srctree
)/include/uapi \
489 -I
$(objtree
)/include/generated
/uapi \
490 -include $(srctree
)/include/linux
/compiler-version.h \
491 -include $(srctree
)/include/linux
/kconfig.h
493 # Use LINUXINCLUDE when you must reference the include/ directory.
494 # Needed to be compatible with the O= option
496 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
497 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
498 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
499 -I
$(objtree
)/include \
502 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
503 KBUILD_CFLAGS
:= -Wall
-Wundef
-Werror
=strict-prototypes
-Wno-trigraphs \
504 -fno-strict-aliasing
-fno-common
-fshort-wchar
-fno-PIE \
505 -Werror
=implicit-function-declaration
-Werror
=implicit-int \
506 -Werror
=return-type
-Wno-format-security \
508 KBUILD_CPPFLAGS
:= -D__KERNEL__
509 KBUILD_AFLAGS_KERNEL
:=
510 KBUILD_CFLAGS_KERNEL
:=
511 KBUILD_AFLAGS_MODULE
:= -DMODULE
512 KBUILD_CFLAGS_MODULE
:= -DMODULE
513 KBUILD_LDFLAGS_MODULE
:=
517 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
518 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
519 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
520 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
521 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
523 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
524 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
525 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
526 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
527 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
529 # Files to ignore in find ... statements
531 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
532 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
534 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
535 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
537 # ===========================================================================
538 # Rules shared between *config targets and build targets
540 # Basic helpers built in scripts/basic/
541 PHONY
+= scripts_basic
543 $(Q
)$(MAKE
) $(build
)=scripts
/basic
544 $(Q
)rm -f .tmp_quiet_recordmcount
546 PHONY
+= outputmakefile
547 # Before starting out-of-tree build, make sure the source tree is clean.
548 # outputmakefile generates a Makefile in the output directory, if using a
549 # separate output directory. This allows convenient use of make in the
551 # At the same time when output Makefile generated, generate .gitignore to
552 # ignore whole output directory
554 ifdef building_out_of_srctree
555 $(Q
)if
[ -f
$(srctree
)/.config
-o \
556 -d
$(srctree
)/include/config
-o \
557 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
559 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
560 echo
>&2 "*** in $(abs_srctree)";\
564 $(Q
)ln
-fsn
$(srctree
) source
565 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile
$(srctree
)
566 $(Q
)test -e .gitignore || \
567 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
570 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
571 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
572 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
573 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
574 CC_VERSION_TEXT
= $(subst $(pound
),,$(shell $(CC
) --version
2>/dev
/null | head
-n
1))
576 ifneq ($(findstring clang
,$(CC_VERSION_TEXT
)),)
577 ifneq ($(CROSS_COMPILE
),)
578 CLANG_FLAGS
+= --target
=$(notdir $(CROSS_COMPILE
:%-=%))
581 CLANG_FLAGS
+= -integrated-as
583 CLANG_FLAGS
+= -no-integrated-as
584 GCC_TOOLCHAIN_DIR
:= $(dir $(shell which
$(CROSS_COMPILE
)elfedit
))
585 CLANG_FLAGS
+= --prefix=$(GCC_TOOLCHAIN_DIR
)$(notdir $(CROSS_COMPILE
))
587 CLANG_FLAGS
+= -Werror
=unknown-warning-option
588 KBUILD_CFLAGS
+= $(CLANG_FLAGS
)
589 KBUILD_AFLAGS
+= $(CLANG_FLAGS
)
593 # Include this also for config targets because some architectures need
594 # cc-cross-prefix to determine CROSS_COMPILE.
596 include $(srctree
)/scripts
/Makefile.compiler
600 # ===========================================================================
601 # *config targets only - make sure prerequisites are updated, and descend
602 # in scripts/kconfig to make the *config target
604 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
605 # KBUILD_DEFCONFIG may point out an alternative default configuration
606 # used for 'make defconfig'
607 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
608 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
610 config
: outputmakefile scripts_basic FORCE
611 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
613 %config
: outputmakefile scripts_basic FORCE
614 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
617 # ===========================================================================
618 # Build targets only - this includes vmlinux, arch specific targets, clean
619 # targets and others. In general all targets except *config targets.
621 # If building an external module we do not care about the all: rule
622 # but instead __all depend on modules
624 ifeq ($(KBUILD_EXTMOD
),)
630 # Decide whether to build built-in, modular, or both.
631 # Normally, just do built-in.
636 # If we have only "make modules", don't compile built-in objects.
637 ifeq ($(MAKECMDGOALS
),modules
)
641 # If we have "make <whatever> modules", compile modules
642 # in addition to whatever we do anyway.
643 # Just "make" or "make all" shall build modules as well
645 ifneq ($(filter all modules nsdeps
%compile_commands.json clang-
%,$(MAKECMDGOALS
)),)
649 ifeq ($(MAKECMDGOALS
),)
653 export KBUILD_MODULES KBUILD_BUILTIN
656 include include/config
/auto.conf
659 ifeq ($(KBUILD_EXTMOD
),)
660 # Objects we will link into vmlinux / subdirs we need to visit
662 drivers-y
:= drivers
/ sound
/
663 drivers-
$(CONFIG_SAMPLES
) += samples
/
664 drivers-
$(CONFIG_NET
) += net
/
667 endif # KBUILD_EXTMOD
669 # The all: target is the default when no target is given on the
671 # This allow a user to issue only 'make' to build a kernel including modules
672 # Defaults to vmlinux, but the arch makefile usually adds further targets
675 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage \
676 $(call cc-option
,-fno-tree-loop-im
) \
677 $(call cc-disable-warning
,maybe-uninitialized
,)
680 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
681 ifdef CONFIG_FUNCTION_TRACER
682 CC_FLAGS_FTRACE
:= -pg
685 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
686 RETPOLINE_VDSO_CFLAGS_GCC
:= -mindirect-branch
=thunk-inline
-mindirect-branch-register
687 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
688 RETPOLINE_VDSO_CFLAGS_CLANG
:= -mretpoline
689 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
690 RETPOLINE_VDSO_CFLAGS
:= $(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_CLANG
)))
691 export RETPOLINE_CFLAGS
692 export RETPOLINE_VDSO_CFLAGS
694 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
697 ifdef may-sync-config
698 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
699 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
700 # because some architectures define CROSS_COMPILE there.
701 include include/config
/auto.conf.cmd
705 @echo
>&2 '*** Configuration file "$@" not found!'
707 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
708 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
712 # The actual configuration files used during the build are stored in
713 # include/generated/ and include/config/. Update them if .config is newer than
714 # include/config/auto.conf (which mirrors .config).
716 # This exploits the 'multi-target pattern rule' trick.
717 # The syncconfig should be executed only once to make all the targets.
718 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
719 quiet_cmd_syncconfig
= SYNC
$@
720 cmd_syncconfig
= $(MAKE
) -f
$(srctree
)/Makefile syncconfig
722 %/config
/auto.conf
%/config
/auto.conf.cmd
%/generated
/autoconf.h
: $(KCONFIG_CONFIG
)
723 +$(call cmd
,syncconfig
)
724 else # !may-sync-config
725 # External modules and some install targets need include/generated/autoconf.h
726 # and include/config/auto.conf but do not care if they are up-to-date.
727 # Use auto.conf to trigger the test
728 PHONY
+= include/config
/auto.conf
730 include/config
/auto.conf
:
731 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
733 echo
>&2 " ERROR: Kernel configuration is invalid."; \
734 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
735 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
739 endif # may-sync-config
742 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
743 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
744 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
745 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
746 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
748 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
750 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
752 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
756 # Tell gcc to never replace conditional load with a non-conditional one
757 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
758 KBUILD_CFLAGS
+= $(call cc-option
,-fno-allow-store-data-races
)
760 ifdef CONFIG_READABLE_ASM
761 # Disable optimizations that make assembler listings hard to read.
762 # reorder blocks reorders the control in the function
763 # ipa clone creates specialized cloned functions
764 # partial inlining inlines only parts of functions
765 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
766 $(call cc-option
,-fno-ipa-cp-clone
,) \
767 $(call cc-option
,-fno-partial-inlining
)
770 ifneq ($(CONFIG_FRAME_WARN
),0)
771 KBUILD_CFLAGS
+= -Wframe-larger-than
=$(CONFIG_FRAME_WARN
)
774 stackp-flags-y
:= -fno-stack-protector
775 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
776 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
778 KBUILD_CFLAGS
+= $(stackp-flags-y
)
780 ifdef CONFIG_CC_IS_CLANG
781 KBUILD_CPPFLAGS
+= -Qunused-arguments
782 KBUILD_CFLAGS
+= -Wno-format-invalid-specifier
783 KBUILD_CFLAGS
+= -Wno-gnu
784 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
785 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
786 # See modpost pattern 2
787 KBUILD_CFLAGS
+= -mno-global-merge
790 # Warn about unmarked fall-throughs in switch statement.
791 # Disabled for clang while comment to attribute conversion happens and
792 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
793 KBUILD_CFLAGS
+= $(call cc-option
,-Wimplicit-fallthrough
,)
796 # These warnings generated too much noise in a regular build.
797 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
798 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
800 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
801 ifdef CONFIG_FRAME_POINTER
802 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
804 # Some targets (ARM with Thumb2, for example), can't be built with frame
805 # pointers. For those, we don't have FUNCTION_TRACER automatically
806 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
807 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
808 # -fomit-frame-pointer with FUNCTION_TRACER.
809 ifndef CONFIG_FUNCTION_TRACER
810 KBUILD_CFLAGS
+= -fomit-frame-pointer
814 # Initialize all stack variables with a 0xAA pattern.
815 ifdef CONFIG_INIT_STACK_ALL_PATTERN
816 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
819 # Initialize all stack variables with a zero value.
820 ifdef CONFIG_INIT_STACK_ALL_ZERO
821 # Future support for zero initialization is still being debated, see
822 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
823 # renamed or dropped.
824 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=zero
825 KBUILD_CFLAGS
+= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
828 # While VLAs have been removed, GCC produces unreachable stack probes
829 # for the randomize_kstack_offset feature. Disable it for all compilers.
830 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-clash-protection
)
834 # Workaround for GCC versions < 5.0
835 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
836 ifdef CONFIG_CC_IS_GCC
837 DEBUG_CFLAGS
+= $(call cc-ifversion
, -lt
, 0500, $(call cc-option
, -fno-var-tracking-assignments
))
840 ifdef CONFIG_DEBUG_INFO
842 ifdef CONFIG_DEBUG_INFO_SPLIT
843 DEBUG_CFLAGS
+= -gsplit-dwarf
848 ifneq ($(LLVM_IAS
),1)
849 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
852 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
853 dwarf-version-
$(CONFIG_DEBUG_INFO_DWARF4
) := 4
854 dwarf-version-
$(CONFIG_DEBUG_INFO_DWARF5
) := 5
855 DEBUG_CFLAGS
+= -gdwarf-
$(dwarf-version-y
)
858 ifdef CONFIG_DEBUG_INFO_REDUCED
859 DEBUG_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
860 $(call cc-option
,-fno-var-tracking
)
863 ifdef CONFIG_DEBUG_INFO_COMPRESSED
864 DEBUG_CFLAGS
+= -gz
=zlib
865 KBUILD_AFLAGS
+= -gz
=zlib
866 KBUILD_LDFLAGS
+= --compress-debug-sections
=zlib
869 endif # CONFIG_DEBUG_INFO
871 KBUILD_CFLAGS
+= $(DEBUG_CFLAGS
)
874 ifdef CONFIG_FUNCTION_TRACER
875 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
876 CC_FLAGS_FTRACE
+= -mrecord-mcount
877 ifdef CONFIG_HAVE_NOP_MCOUNT
878 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
879 CC_FLAGS_FTRACE
+= -mnop-mcount
880 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
884 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
885 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
887 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
888 ifdef CONFIG_HAVE_C_RECORDMCOUNT
889 BUILD_C_RECORDMCOUNT
:= y
890 export BUILD_C_RECORDMCOUNT
893 ifdef CONFIG_HAVE_FENTRY
894 ifeq ($(call cc-option-yn
, -mfentry
),y
)
895 CC_FLAGS_FTRACE
+= -mfentry
896 CC_FLAGS_USING
+= -DCC_USING_FENTRY
899 export CC_FLAGS_FTRACE
900 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
901 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
904 # We trigger additional mismatches with less inlining
905 ifdef CONFIG_DEBUG_SECTION_MISMATCH
906 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
909 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
910 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
911 LDFLAGS_vmlinux
+= --gc-sections
914 ifdef CONFIG_SHADOW_CALL_STACK
915 CC_FLAGS_SCS
:= -fsanitize
=shadow-call-stack
916 KBUILD_CFLAGS
+= $(CC_FLAGS_SCS
)
920 ifdef CONFIG_LTO_CLANG
921 ifdef CONFIG_LTO_CLANG_THIN
922 CC_FLAGS_LTO
:= -flto
=thin
-fsplit-lto-unit
923 KBUILD_LDFLAGS
+= --thinlto-cache-dir
=$(extmod_prefix
).thinlto-cache
925 CC_FLAGS_LTO
:= -flto
927 CC_FLAGS_LTO
+= -fvisibility
=hidden
929 # Limit inlining across translation units to reduce binary size
930 KBUILD_LDFLAGS
+= -mllvm
-import-instr-limit
=5
932 # Check for frame size exceeding threshold during prolog/epilog insertion.
933 ifneq ($(CONFIG_FRAME_WARN
),0)
934 KBUILD_LDFLAGS
+= -plugin-opt
=-warn-stack-size
=$(CONFIG_FRAME_WARN
)
939 KBUILD_CFLAGS
+= -fno-lto
$(CC_FLAGS_LTO
)
940 KBUILD_AFLAGS
+= -fno-lto
944 ifdef CONFIG_CFI_CLANG
945 CC_FLAGS_CFI
:= -fsanitize
=cfi \
946 -fsanitize-cfi-cross-dso \
947 -fno-sanitize-cfi-canonical-jump-tables \
948 -fno-sanitize-trap
=cfi \
949 -fno-sanitize-blacklist
951 ifdef CONFIG_CFI_PERMISSIVE
952 CC_FLAGS_CFI
+= -fsanitize-recover
=cfi
955 # If LTO flags are filtered out, we must also filter out CFI.
956 CC_FLAGS_LTO
+= $(CC_FLAGS_CFI
)
957 KBUILD_CFLAGS
+= $(CC_FLAGS_CFI
)
961 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
962 KBUILD_CFLAGS
+= -falign-functions
=32
965 # arch Makefile may override CC so keep this after arch Makefile is included
966 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
968 # warn about C99 declaration after statement
969 KBUILD_CFLAGS
+= -Wdeclaration-after-statement
971 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
972 KBUILD_CFLAGS
+= -Wvla
974 # disable pointer signed / unsigned warnings in gcc 4.0
975 KBUILD_CFLAGS
+= -Wno-pointer-sign
977 # disable stringop warnings in gcc 8+
978 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
980 # We'll want to enable this eventually, but it's not going away for 5.7 at least
981 KBUILD_CFLAGS
+= $(call cc-disable-warning
, zero-length-bounds
)
982 KBUILD_CFLAGS
+= $(call cc-disable-warning
, array-bounds
)
983 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-overflow
)
985 # Another good warning that we'll want to enable eventually
986 KBUILD_CFLAGS
+= $(call cc-disable-warning
, restrict
)
988 # Enabled with W=2, disabled by default as noisy
989 KBUILD_CFLAGS
+= $(call cc-disable-warning
, maybe-uninitialized
)
991 # disable invalid "can't wrap" optimizations for signed / pointers
992 KBUILD_CFLAGS
+= -fno-strict-overflow
994 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
995 KBUILD_CFLAGS
+= -fno-stack-check
997 # conserve stack if available
998 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
1000 # Prohibit date/time macros, which would make the build non-deterministic
1001 KBUILD_CFLAGS
+= -Werror
=date-time
1003 # enforce correct pointer usage
1004 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
1006 # Require designated initializers for all marked structures
1007 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
1009 # change __FILE__ to the relative path from the srctree
1010 KBUILD_CPPFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
1012 # include additional Makefiles when needed
1013 include-y
:= scripts
/Makefile.extrawarn
1014 include-
$(CONFIG_KASAN
) += scripts
/Makefile.kasan
1015 include-
$(CONFIG_KCSAN
) += scripts
/Makefile.kcsan
1016 include-
$(CONFIG_UBSAN
) += scripts
/Makefile.ubsan
1017 include-
$(CONFIG_KCOV
) += scripts
/Makefile.kcov
1018 include-
$(CONFIG_GCC_PLUGINS
) += scripts
/Makefile.gcc-plugins
1020 include $(addprefix $(srctree
)/, $(include-y
))
1022 # scripts/Makefile.gcc-plugins is intentionally included last.
1023 # Do not add $(call cc-option,...) below this line. When you build the kernel
1024 # from the clean source tree, the GCC plugins do not exist at this point.
1026 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1027 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
1028 KBUILD_AFLAGS
+= $(KAFLAGS
)
1029 KBUILD_CFLAGS
+= $(KCFLAGS
)
1031 KBUILD_LDFLAGS_MODULE
+= --build-id
=sha1
1032 LDFLAGS_vmlinux
+= --build-id
=sha1
1034 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
1035 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
1038 ifeq ($(CONFIG_RELR
),y
)
1039 LDFLAGS_vmlinux
+= --pack-dyn-relocs
=relr
1042 # We never want expected sections to be placed heuristically by the
1043 # linker. All sections should be explicitly named in the linker script.
1044 ifdef CONFIG_LD_ORPHAN_WARN
1045 LDFLAGS_vmlinux
+= --orphan-handling
=warn
1048 # Align the bit size of userspace programs with the kernel
1049 KBUILD_USERCFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1050 KBUILD_USERLDFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1052 # make the checker run with the right architecture
1053 CHECKFLAGS
+= --arch
=$(ARCH
)
1055 # insure the checker run with the right endianness
1056 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
1058 # the checker needs the correct machine size
1059 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
1061 # Default kernel image to build when no specific target is given.
1062 # KBUILD_IMAGE may be overruled on the command line or
1063 # set in the environment
1064 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1065 # this default value
1066 export KBUILD_IMAGE ?
= vmlinux
1069 # INSTALL_PATH specifies where to place the updated kernel and system map
1070 # images. Default is /boot, but you can set it to other values
1071 export INSTALL_PATH ?
= /boot
1074 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1075 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1076 # an argument if needed. Otherwise it defaults to the kernel install path
1078 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
1081 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1082 # relocations required by build roots. This is not defined in the
1083 # makefile but the argument can be passed to make if needed.
1086 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
1089 HOST_LIBELF_LIBS
= $(shell pkg-config libelf
--libs
2>/dev
/null || echo
-lelf
)
1091 has_libelf
= $(call try-run
,\
1092 echo
"int main() {}" |
$(HOSTCC
) $(KBUILD_HOSTLDFLAGS
) -xc
-o
/dev
/null
$(HOST_LIBELF_LIBS
) -,1,0)
1094 ifdef CONFIG_STACK_VALIDATION
1095 ifeq ($(has_libelf
),1)
1096 objtool_target
:= tools
/objtool FORCE
1098 SKIP_STACK_VALIDATION
:= 1
1099 export SKIP_STACK_VALIDATION
1103 PHONY
+= resolve_btfids_clean
1105 resolve_btfids_O
= $(abspath
$(objtree
))/tools
/bpf
/resolve_btfids
1107 # tools/bpf/resolve_btfids directory might not exist
1108 # in output directory, skip its clean in that case
1109 resolve_btfids_clean
:
1110 ifneq ($(wildcard $(resolve_btfids_O
)),)
1111 $(Q
)$(MAKE
) -sC
$(srctree
)/tools
/bpf
/resolve_btfids O
=$(resolve_btfids_O
) clean
1115 ifdef CONFIG_DEBUG_INFO_BTF
1116 ifeq ($(has_libelf
),1)
1117 resolve_btfids_target
:= tools
/bpf
/resolve_btfids FORCE
1119 ERROR_RESOLVE_BTFIDS
:= 1
1121 endif # CONFIG_DEBUG_INFO_BTF
1126 export extmod_prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
1127 export MODORDER
:= $(extmod_prefix
)modules.order
1128 export MODULES_NSDEPS
:= $(extmod_prefix
)modules.nsdeps
1130 ifeq ($(KBUILD_EXTMOD
),)
1131 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
1133 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, \
1134 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
1135 $(libs-y
) $(libs-m
)))
1137 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) Documentation \
1138 $(patsubst %/,%,$(filter %/, $(core-
) \
1139 $(drivers-
) $(libs-
))))
1141 subdir-modorder
:= $(addsuffix modules.order
,$(filter %/, \
1142 $(core-y
) $(core-m
) $(libs-y
) $(libs-m
) \
1143 $(drivers-y
) $(drivers-m
)))
1145 build-dirs
:= $(vmlinux-dirs
)
1146 clean-dirs
:= $(vmlinux-alldirs
)
1148 # Externally visible symbols (used by link-vmlinux.sh)
1149 KBUILD_VMLINUX_OBJS
:= $(head-y
) $(patsubst %/,%/built-in.a
, $(core-y
))
1150 KBUILD_VMLINUX_OBJS
+= $(addsuffix built-in.a
, $(filter %/, $(libs-y
)))
1151 ifdef CONFIG_MODULES
1152 KBUILD_VMLINUX_OBJS
+= $(patsubst %/, %/lib.a
, $(filter %/, $(libs-y
)))
1153 KBUILD_VMLINUX_LIBS
:= $(filter-out %/, $(libs-y
))
1155 KBUILD_VMLINUX_LIBS
:= $(patsubst %/,%/lib.a
, $(libs-y
))
1157 KBUILD_VMLINUX_OBJS
+= $(patsubst %/,%/built-in.a
, $(drivers-y
))
1159 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1160 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1161 # used by scripts/Makefile.package
1162 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) LICENSES arch
include scripts tools
)
1164 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)
1166 # Recurse until adjust_autoksyms.sh is satisfied
1167 PHONY
+= autoksyms_recursive
1168 ifdef CONFIG_TRIM_UNUSED_KSYMS
1169 # For the kernel to actually contain only the needed exported symbols,
1170 # we have to build modules as well to determine what those symbols are.
1171 # (this can be evaluated only once include/config/auto.conf has been included)
1174 autoksyms_recursive
: descend modules.order
1175 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1176 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1179 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1181 quiet_cmd_autoksyms_h
= GEN
$@
1182 cmd_autoksyms_h
= mkdir
-p
$(dir $@
); \
1183 $(CONFIG_SHELL
) $(srctree
)/scripts
/gen_autoksyms.sh
$@
1186 $(call cmd
,autoksyms_h
)
1188 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1190 # Final link of vmlinux with optional arch pass after final link
1191 cmd_link-vmlinux
= \
1192 $(CONFIG_SHELL
) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1193 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1195 vmlinux
: scripts
/link-vmlinux.sh autoksyms_recursive
$(vmlinux-deps
) FORCE
1196 +$(call if_changed_dep
,link-vmlinux
)
1200 # The actual objects are generated when descending,
1201 # make sure no implicit rule kicks in
1202 $(sort $(vmlinux-deps
) $(subdir-modorder
)): descend
;
1204 filechk_kernel.release
= \
1205 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1207 # Store (new) KERNELRELEASE string in include/config/kernel.release
1208 include/config
/kernel.release
: FORCE
1209 $(call filechk
,kernel.release
)
1211 # Additional helpers built in scripts/
1212 # Carefully list dependencies so we do not try to build scripts twice
1215 scripts
: scripts_basic scripts_dtc
1216 $(Q
)$(MAKE
) $(build
)=$(@
)
1218 # Things we need to do before we recursively start building the kernel
1219 # or the modules are listed in "prepare".
1220 # A multi level approach is used. prepareN is processed before prepareN-1.
1221 # archprepare is used in arch Makefiles and when processed asm symlink,
1222 # version.h and scripts_basic is processed / created.
1224 PHONY
+= prepare archprepare
1226 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1227 asm-generic
$(version_h
) $(autoksyms_h
) include/generated
/utsrelease.h \
1228 include/generated
/autoconf.h remove-stale-files
1230 prepare0
: archprepare
1231 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1232 $(Q
)$(MAKE
) $(build
)=.
1234 # All the preparing..
1235 prepare
: prepare0 prepare-objtool prepare-resolve_btfids
1237 PHONY
+= remove-stale-files
1239 $(Q
)$(srctree
)/scripts
/remove-stale-files
1241 # Support for using generic headers in asm-generic
1242 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1244 PHONY
+= asm-generic uapi-asm-generic
1245 asm-generic
: uapi-asm-generic
1246 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1247 generic
=include/asm-generic
1249 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1250 generic
=include/uapi
/asm-generic
1252 PHONY
+= prepare-objtool prepare-resolve_btfids
1253 prepare-objtool
: $(objtool_target
)
1254 ifeq ($(SKIP_STACK_VALIDATION
),1)
1255 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
1256 @echo
"error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1259 ifdef CONFIG_UNWINDER_ORC
1260 @echo
"error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1263 @echo
"warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1267 prepare-resolve_btfids
: $(resolve_btfids_target
)
1268 ifeq ($(ERROR_RESOLVE_BTFIDS
),1)
1269 @echo
"error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1272 # Generate some files
1273 # ---------------------------------------------------------------------------
1275 # KERNELRELEASE can change from a few different places, meaning version.h
1276 # needs to be updated, so this check is forced on all builds
1279 define filechk_utsrelease.h
1280 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1281 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1284 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1287 define filechk_version.h
1288 if
[ $(SUBLEVEL
) -gt
255 ]; then \
1289 echo \
#define LINUX_VERSION_CODE $(shell \
1290 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + 255); \
1292 echo \
#define LINUX_VERSION_CODE $(shell \
1293 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
1295 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1296 ((c) > 255 ? 255 : (c)))'; \
1297 echo \
#define LINUX_VERSION_MAJOR $(VERSION); \
1298 echo \
#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1299 echo \
#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1302 $(version_h
): PATCHLEVEL
:= $(if
$(PATCHLEVEL
), $(PATCHLEVEL
), 0)
1303 $(version_h
): SUBLEVEL
:= $(if
$(SUBLEVEL
), $(SUBLEVEL
), 0)
1305 $(call filechk
,version.h
)
1307 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1308 $(call filechk
,utsrelease.h
)
1312 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1313 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1315 # ---------------------------------------------------------------------------
1318 #Default location for installed headers
1319 export INSTALL_HDR_PATH
= $(objtree
)/usr
1321 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1322 cmd_headers_install
= \
1323 mkdir
-p
$(INSTALL_HDR_PATH
); \
1324 rsync
-mrl
--include='*/' --include='*\.h' --exclude
='*' \
1325 usr
/include $(INSTALL_HDR_PATH
)
1327 PHONY
+= headers_install
1328 headers_install
: headers
1329 $(call cmd
,headers_install
)
1331 PHONY
+= archheaders archscripts
1333 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1336 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1337 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1338 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1339 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1340 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1342 # Deprecated. It is no-op now.
1343 PHONY
+= headers_check
1345 @echo
>&2 "=================== WARNING ==================="
1346 @echo
>&2 "Since Linux 5.5, 'make headers_check' is no-op,"
1347 @echo
>&2 "and will be removed after Linux 5.15 release."
1348 @echo
>&2 "Please remove headers_check from your scripts."
1349 @echo
>&2 "==============================================="
1351 ifdef CONFIG_HEADERS_INSTALL
1355 PHONY
+= scripts_unifdef
1356 scripts_unifdef
: scripts_basic
1357 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1359 # ---------------------------------------------------------------------------
1364 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1367 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1369 PHONY
+= kselftest-merge
1371 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1372 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config | \
1373 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-m
$(objtree
)/.config
1374 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1376 # ---------------------------------------------------------------------------
1379 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1380 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1385 %.dtb
: include/config
/kernel.release scripts_dtc
1386 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1388 %.dtbo
: include/config
/kernel.release scripts_dtc
1389 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1391 PHONY
+= dtbs dtbs_install dtbs_check
1392 dtbs
: include/config
/kernel.release scripts_dtc
1393 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1395 ifneq ($(filter dtbs_check
, $(MAKECMDGOALS
)),)
1397 dtbs
: dt_binding_check
1403 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
) dst
=$(INSTALL_DTBS_PATH
)
1405 ifdef CONFIG_OF_EARLY_FLATTREE
1411 PHONY
+= scripts_dtc
1412 scripts_dtc
: scripts_basic
1413 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1415 ifneq ($(filter dt_binding_check
, $(MAKECMDGOALS
)),)
1416 export CHECK_DT_BINDING
=y
1419 PHONY
+= dt_binding_check
1420 dt_binding_check
: scripts_dtc
1421 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1423 # ---------------------------------------------------------------------------
1426 ifdef CONFIG_MODULES
1428 # By default, build modules as well
1432 # When we're building modules with modversions, we need to consider
1433 # the built-in objects during the descend as well, in order to
1434 # make sure the checksums are up to date before we record them.
1435 ifdef CONFIG_MODVERSIONS
1441 # A module can be listed more than once in obj-m resulting in
1442 # duplicate lines in modules.order files. Those are removed
1443 # using awk while concatenating to the final file.
1446 modules
: $(if
$(KBUILD_BUILTIN
),vmlinux
) modules_check modules_prepare
1448 cmd_modules_order
= $(AWK
) '!x[$$0]++' $(real-prereqs
) > $@
1450 modules.order
: $(subdir-modorder
) FORCE
1451 $(call if_changed
,modules_order
)
1453 targets
+= modules.order
1455 # Target to prepare building external modules
1456 PHONY
+= modules_prepare
1457 modules_prepare
: prepare
1458 $(Q
)$(MAKE
) $(build
)=scripts scripts
/module.lds
1460 export modules_sign_only
:=
1462 ifeq ($(CONFIG_MODULE_SIG
),y
)
1463 PHONY
+= modules_sign
1464 modules_sign
: modules_install
1467 # modules_sign is a subset of modules_install.
1468 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1469 ifeq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1470 modules_sign_only
:= y
1475 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1476 modinst_pre
:= __modinst_pre
1479 modules_install
: $(modinst_pre
)
1480 PHONY
+= __modinst_pre
1482 @
rm -rf
$(MODLIB
)/kernel
1483 @
rm -f
$(MODLIB
)/source
1484 @mkdir
-p
$(MODLIB
)/kernel
1485 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1486 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1487 rm -f
$(MODLIB
)/build
; \
1488 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1490 @sed
's:^:kernel/:' modules.order
> $(MODLIB
)/modules.order
1491 @cp
-f modules.builtin
$(MODLIB
)/
1492 @cp
-f
$(objtree
)/modules.builtin.modinfo
$(MODLIB
)/
1494 endif # CONFIG_MODULES
1497 # Cleaning is done on three levels.
1498 # make clean Delete most generated files
1499 # Leave enough to build external modules
1500 # make mrproper Delete the current configuration, and all generated files
1501 # make distclean Remove editor backup files, patch leftover files and the like
1503 # Directories & files removed with 'make clean'
1504 CLEAN_FILES
+= include/ksym vmlinux.symvers modules-only.symvers \
1505 modules.builtin modules.builtin.modinfo modules.nsdeps \
1506 compile_commands.json .thinlto-cache
1508 # Directories & files removed with 'make mrproper'
1509 MRPROPER_FILES
+= include/config
include/generated \
1510 arch
/$(SRCARCH
)/include/generated .tmp_objdiff \
1511 debian snap tar-install \
1512 .config .config.old .version \
1514 certs
/signing_key.pem certs
/signing_key.x509 \
1519 # clean - Delete most, but leave enough to build external modules
1521 clean: rm-files
:= $(CLEAN_FILES
)
1523 PHONY
+= archclean vmlinuxclean
1526 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1527 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1529 clean: archclean vmlinuxclean resolve_btfids_clean
1531 # mrproper - Delete all generated files, including .config
1533 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1534 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1536 PHONY
+= $(mrproper-dirs
) mrproper
1538 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1540 mrproper
: clean $(mrproper-dirs
)
1548 @find .
$(RCS_FIND_IGNORE
) \
1549 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1550 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1551 -o
-name
'core' -o
-name
tags -o
-name TAGS
-o
-name
'cscope*' \
1552 -o
-name GPATH
-o
-name GRTAGS
-o
-name GSYMS
-o
-name GTAGS \
) \
1553 -type f
-print | xargs
rm -f
1556 # Packaging of the kernel to various formats
1557 # ---------------------------------------------------------------------------
1560 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1561 %pkg
: include/config
/kernel.release FORCE
1562 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1564 # Brief documentation of the typical targets used
1565 # ---------------------------------------------------------------------------
1567 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1568 boards
:= $(sort $(notdir $(boards
)))
1569 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1570 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1574 @echo
'Cleaning targets:'
1575 @echo
' clean - Remove most generated files but keep the config and'
1576 @echo
' enough build support to build external modules'
1577 @echo
' mrproper - Remove all generated files + config + various backup files'
1578 @echo
' distclean - mrproper + remove editor backup and patch files'
1580 @echo
'Configuration targets:'
1581 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1583 @echo
'Other generic targets:'
1584 @echo
' all - Build all targets marked with [*]'
1585 @echo
'* vmlinux - Build the bare kernel'
1586 @echo
'* modules - Build all modules'
1587 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1588 @echo
' dir/ - Build all files in dir and below'
1589 @echo
' dir/file.[ois] - Build specified target only'
1590 @echo
' dir/file.ll - Build the LLVM assembly file'
1591 @echo
' (requires compiler support for LLVM assembly generation)'
1592 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1593 @echo
' (requires a recent binutils and recent build (System.map))'
1594 @echo
' dir/file.ko - Build module including final link'
1595 @echo
' modules_prepare - Set up for building external modules'
1596 @echo
' tags/TAGS - Generate tags file for editors'
1597 @echo
' cscope - Generate cscope index'
1598 @echo
' gtags - Generate GNU GLOBAL index'
1599 @echo
' kernelrelease - Output the release version string (use with make -s)'
1600 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1601 @echo
' image_name - Output the image name (use with make -s)'
1602 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1603 echo
' (default: $(INSTALL_HDR_PATH))'; \
1605 @echo
'Static analysers:'
1606 @echo
' checkstack - Generate a list of stack hogs'
1607 @echo
' versioncheck - Sanity check on version.h usage'
1608 @echo
' includecheck - Check for duplicate included header files'
1609 @echo
' export_report - List the usages of all exported symbols'
1610 @echo
' headerdep - Detect inclusion cycles in headers'
1611 @echo
' coccicheck - Check with Coccinelle'
1612 @echo
' clang-analyzer - Check with clang static analyzer'
1613 @echo
' clang-tidy - Check with clang-tidy'
1616 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1618 @echo
'Kernel selftest:'
1619 @echo
' kselftest - Build and run kernel selftest'
1620 @echo
' Build, install, and boot kernel before'
1621 @echo
' running kselftest on it'
1622 @echo
' Run as root for full coverage'
1623 @echo
' kselftest-all - Build kernel selftest'
1624 @echo
' kselftest-install - Build and install kernel selftest'
1625 @echo
' kselftest-clean - Remove all generated kselftest files'
1626 @echo
' kselftest-merge - Merge all the config dependencies of'
1627 @echo
' kselftest to existing .config.'
1630 echo
'Devicetree:'; \
1631 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1632 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1633 echo
' dt_binding_check - Validate device tree binding documents'; \
1634 echo
' dtbs_check - Validate device tree source files';\
1637 @echo
'Userspace tools targets:'
1638 @echo
' use "make tools/help"'
1639 @echo
' or "cd tools; make help"'
1641 @echo
'Kernel packaging:'
1642 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1644 @echo
'Documentation targets:'
1645 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1647 @echo
'Architecture specific targets ($(SRCARCH)):'
1648 @
$(if
$(archhelp
),$(archhelp
),\
1649 echo
' No architecture specific help defined for $(SRCARCH)')
1652 $(foreach b
, $(boards
), \
1653 printf
" %-27s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1655 @
$(if
$(board-dirs
), \
1656 $(foreach b
, $(board-dirs
), \
1657 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1658 printf
" %-16s - Show all of the above\\n" help-boards
; \
1661 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1662 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1663 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1664 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK'
1665 @echo
' (sparse by default)'
1666 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1667 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1668 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1669 @echo
' 1: warnings which may be relevant and do not occur too often'
1670 @echo
' 2: warnings which occur quite often but may still be relevant'
1671 @echo
' 3: more obscure warnings, can most likely be ignored'
1672 @echo
' Multiple levels can be combined with W=12 or W=123'
1674 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1675 @echo
'For further info see the ./README file'
1678 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1680 help-boards
: $(help-board-dirs
)
1682 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1684 $(help-board-dirs
): help-
%:
1685 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1686 @
$(if
$(boards-per-dir
), \
1687 $(foreach b
, $(boards-per-dir
), \
1688 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1692 # Documentation targets
1693 # ---------------------------------------------------------------------------
1694 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1695 linkcheckdocs dochelp refcheckdocs
1696 PHONY
+= $(DOC_TARGETS
)
1698 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1701 # ---------------------------------------------------------------------------
1703 PHONY
+= scripts_gdb
1704 scripts_gdb
: prepare0
1705 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1706 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1708 ifdef CONFIG_GDB_SCRIPTS
1712 else # KBUILD_EXTMOD
1715 # External module support.
1716 # When building external modules the kernel used as basis is considered
1717 # read-only, and no consistency checks are made and the make
1718 # system is not used on the basis kernel. If updates are required
1719 # in the basis kernel ordinary make commands (without M=...) must be used.
1721 # We are always building only modules.
1725 build-dirs
:= $(KBUILD_EXTMOD
)
1726 $(MODORDER
): descend
1729 compile_commands.json
: $(extmod_prefix
)compile_commands.json
1730 PHONY
+= compile_commands.json
1732 clean-dirs
:= $(KBUILD_EXTMOD
)
1733 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
$(KBUILD_EXTMOD
)/modules.nsdeps \
1734 $(KBUILD_EXTMOD
)/compile_commands.json
$(KBUILD_EXTMOD
)/.thinlto-cache
1738 @echo
' Building external modules.'
1739 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1741 @echo
' modules - default target, build the module(s)'
1742 @echo
' modules_install - install the module'
1743 @echo
' clean - remove generated files in module directory only'
1746 # no-op for external module builds
1747 PHONY
+= prepare modules_prepare
1749 endif # KBUILD_EXTMOD
1751 # ---------------------------------------------------------------------------
1754 PHONY
+= modules modules_install
1756 ifdef CONFIG_MODULES
1758 modules
: modules_check
1759 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1761 PHONY
+= modules_check
1762 modules_check
: $(MODORDER
)
1763 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
$<
1765 quiet_cmd_depmod
= DEPMOD
$(MODLIB
)
1766 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1770 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1773 else # CONFIG_MODULES
1775 # Modules not configured
1776 # ---------------------------------------------------------------------------
1778 modules modules_install
:
1780 @echo
>&2 '*** The present kernel configuration has modules disabled.'
1781 @echo
>&2 '*** To use the module feature, please run "make menuconfig" etc.'
1782 @echo
>&2 '*** to enable CONFIG_MODULES.'
1786 endif # CONFIG_MODULES
1789 # ---------------------------------------------------------------------------
1790 # To build individual files in subdirectories, you can do like this:
1792 # make foo/bar/baz.s
1794 # The supported suffixes for single-target are listed in 'single-targets'
1796 # To build only under specific subdirectories, you can do like this:
1802 # .ko is special because modpost is needed
1803 single-ko
:= $(sort $(filter %.ko
, $(MAKECMDGOALS
)))
1804 single-no-ko
:= $(sort $(patsubst %.ko
,%.mod
, $(MAKECMDGOALS
)))
1806 $(single-ko
): single_modpost
1808 $(single-no-ko
): descend
1811 ifeq ($(KBUILD_EXTMOD
),)
1812 # For the single build of in-tree modules, use a temporary file to avoid
1813 # the situation of modules_install installing an invalid modules.order.
1814 MODORDER
:= .modules.tmp
1817 PHONY
+= single_modpost
1818 single_modpost
: $(single-no-ko
) modules_prepare
1819 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod_prefix
)$m;) } > $(MODORDER
)
1820 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1824 export KBUILD_SINGLE_TARGETS
:= $(addprefix $(extmod_prefix
), $(single-no-ko
))
1826 # trim unrelated directories
1827 build-dirs
:= $(foreach d
, $(build-dirs
), \
1828 $(if
$(filter $(d
)/%, $(KBUILD_SINGLE_TARGETS
)), $(d
)))
1832 ifndef CONFIG_MODULES
1836 # Handle descending into subdirectories listed in $(build-dirs)
1837 # Preset locale variables to speed up the build process. Limit locale
1838 # tweaks to this spot to avoid wrong language settings when running
1839 # make menuconfig etc.
1840 # Error messages still appears in the original language
1841 PHONY
+= descend
$(build-dirs
)
1842 descend
: $(build-dirs
)
1843 $(build-dirs
): prepare
1844 $(Q
)$(MAKE
) $(build
)=$@ \
1845 single-build
=$(if
$(filter-out $@
/, $(filter $@
/%, $(KBUILD_SINGLE_TARGETS
))),1) \
1846 need-builtin
=1 need-modorder
=1
1848 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
1849 PHONY
+= $(clean-dirs
) clean
1851 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1853 clean: $(clean-dirs
)
1855 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1856 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1858 -o
-name
'*.dtb' -o
-name
'*.dtbo' -o
-name
'*.dtb.S' -o
-name
'*.dt.yaml' \
1859 -o
-name
'*.dwo' -o
-name
'*.lst' \
1860 -o
-name
'*.su' -o
-name
'*.mod' \
1861 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1862 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1863 -o
-name
'*.asn1.[ch]' \
1864 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1865 -o
-name
'.tmp_*.o.*' \
1866 -o
-name
'*.c.[012]*.*' \
1869 -o
-name
'*.*.symversions' \
) -type f
-print | xargs
rm -f
1871 # Generate tags for editors
1872 # ---------------------------------------------------------------------------
1873 quiet_cmd_tags
= GEN
$@
1874 cmd_tags
= $(BASH
) $(srctree
)/scripts
/tags.sh
$@
1876 tags TAGS cscope gtags
: FORCE
1879 # Script to generate missing namespace dependencies
1880 # ---------------------------------------------------------------------------
1883 nsdeps
: export KBUILD_NSDEPS
=1
1885 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/nsdeps
1888 # ---------------------------------------------------------------------------
1890 quiet_cmd_gen_compile_commands
= GEN
$@
1891 cmd_gen_compile_commands
= $(PYTHON3
) $< -a
$(AR
) -o
$@
$(filter-out $<, $(real-prereqs
))
1893 $(extmod_prefix
)compile_commands.json
: scripts
/clang-tools
/gen_compile_commands.py \
1894 $(if
$(KBUILD_EXTMOD
),,$(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)) \
1895 $(if
$(CONFIG_MODULES
), $(MODORDER
)) FORCE
1896 $(call if_changed
,gen_compile_commands
)
1898 targets
+= $(extmod_prefix
)compile_commands.json
1900 PHONY
+= clang-tidy clang-analyzer
1902 ifdef CONFIG_CC_IS_CLANG
1903 quiet_cmd_clang_tools
= CHECK
$<
1904 cmd_clang_tools
= $(PYTHON3
) $(srctree
)/scripts
/clang-tools
/run-clang-tools.py
$@
$<
1906 clang-tidy clang-analyzer
: $(extmod_prefix
)compile_commands.json
1907 $(call cmd
,clang_tools
)
1909 clang-tidy clang-analyzer
:
1910 @echo
"$@ requires CC=clang" >&2
1914 # Scripts to check various things for consistency
1915 # ---------------------------------------------------------------------------
1917 PHONY
+= includecheck versioncheck coccicheck export_report
1920 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1921 -name
'*.[hcS]' -type f
-print |
sort \
1922 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1925 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1926 -name
'*.[hcS]' -type f
-print |
sort \
1927 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1930 $(Q
)$(BASH
) $(srctree
)/scripts
/$@
1933 $(PERL
) $(srctree
)/scripts
/export_report.pl
1935 PHONY
+= checkstack kernelrelease kernelversion image_name
1937 # UML needs a little special treatment here. It wants to use the host
1938 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1939 # else wants $(ARCH), including people doing cross-builds, which means
1940 # that $(SUBARCH) doesn't work here.
1942 CHECKSTACK_ARCH
:= $(SUBARCH
)
1944 CHECKSTACK_ARCH
:= $(ARCH
)
1947 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1948 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1951 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1954 @echo
$(KERNELVERSION
)
1957 @echo
$(KBUILD_IMAGE
)
1959 # Clear a bunch of variables before executing the submake
1961 ifeq ($(quiet
),silent_
)
1966 $(Q
)mkdir
-p
$(objtree
)/tools
1967 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1970 $(Q
)mkdir
-p
$(objtree
)/tools
1971 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1973 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1974 cmd_rmfiles
= rm -rf
$(rm-files
)
1976 # read saved command lines for existing targets
1977 existing-targets
:= $(wildcard $(sort $(targets
)))
1979 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
1981 endif # config-build
1983 endif # need-sub-make
1988 # Declare the contents of the PHONY variable as phony. We keep that
1989 # information in a variable so we can use it in if_changed and friends.