1 # SPDX-License-Identifier: GPL-2.0
6 NAME
= 💕 Valentine
's Day Edition 💕
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
))),)
101 export quiet Q KBUILD_VERBOSE
103 # Kbuild will save output files in the current working directory.
104 # This does not need to match to the root of the kernel source tree.
106 # For example, you can do this:
108 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
110 # If you want to save output files in a different location, there are
111 # two syntaxes to specify it.
114 # Use "make O=dir/to/store/output/files/"
116 # 2) Set KBUILD_OUTPUT
117 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
118 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
120 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
123 # Do we want to change the working directory?
124 ifeq ("$(origin O)", "command line")
125 KBUILD_OUTPUT
:= $(O
)
128 ifneq ($(KBUILD_OUTPUT
),)
129 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
130 # expand a shell special character '~'. We use a somewhat tedious way here.
131 abs_objtree
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) && pwd
)
132 $(if
$(abs_objtree
),, \
133 $(error failed to create output directory
"$(KBUILD_OUTPUT)"))
135 # $(realpath ...) resolves symlinks
136 abs_objtree
:= $(realpath
$(abs_objtree
))
138 abs_objtree
:= $(CURDIR
)
139 endif # ifneq ($(KBUILD_OUTPUT),)
141 ifeq ($(abs_objtree
),$(CURDIR
))
142 # Suppress "Entering directory ..." unless we are changing the work directory.
143 MAKEFLAGS
+= --no-print-directory
148 abs_srctree
:= $(realpath
$(dir $(lastword
$(MAKEFILE_LIST
))))
150 ifneq ($(words $(subst :, ,$(abs_srctree
))), 1)
151 $(error source directory cannot contain spaces or colons
)
154 ifneq ($(abs_srctree
),$(abs_objtree
))
155 # Look for make include files relative to root of kernel src
157 # This does not become effective immediately because MAKEFLAGS is re-parsed
158 # once after the Makefile is read. We need to invoke sub-make.
159 MAKEFLAGS
+= --include-dir
=$(abs_srctree
)
163 this-makefile
:= $(lastword
$(MAKEFILE_LIST
))
165 ifneq ($(filter 3.
%,$(MAKE_VERSION
)),)
166 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
167 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
169 # Cancel implicit rules for this Makefile.
173 export abs_srctree abs_objtree
174 export sub_make_done
:= 1
176 ifeq ($(need-sub-make
),1)
178 PHONY
+= $(MAKECMDGOALS
) __sub-make
180 $(filter-out $(this-makefile
), $(MAKECMDGOALS
)) __all
: __sub-make
183 # Invoke a second make in the output directory, passing relevant variables
185 $(Q
)$(MAKE
) -C
$(abs_objtree
) -f
$(abs_srctree
)/Makefile
$(MAKECMDGOALS
)
187 endif # need-sub-make
188 endif # sub_make_done
190 # We process the rest of the Makefile if this is the final invocation of make
191 ifeq ($(need-sub-make
),)
193 # Do not print "Entering directory ...",
194 # but we want to display it when entering to the output directory
195 # so that IDEs/editors are able to understand relative filenames.
196 MAKEFLAGS
+= --no-print-directory
198 # Call a source code checker (by default, "sparse") as part of the
201 # Use 'make C=1' to enable checking of only re-compiled files.
202 # Use 'make C=2' to enable checking of *all* source files, regardless
203 # of whether they are re-compiled or not.
205 # See the file "Documentation/dev-tools/sparse.rst" for more details,
206 # including where to get the "sparse" utility.
208 ifeq ("$(origin C)", "command line")
209 KBUILD_CHECKSRC
= $(C
)
211 ifndef KBUILD_CHECKSRC
215 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
216 # directory of external module to build. Setting M= takes precedence.
217 ifeq ("$(origin M)", "command line")
218 KBUILD_EXTMOD
:= $(M
)
221 $(if
$(word 2, $(KBUILD_EXTMOD
)), \
222 $(error building multiple external modules is not supported
))
224 export KBUILD_CHECKSRC KBUILD_EXTMOD
226 extmod-prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
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
260 old_version_h
:= include/linux
/version.h
262 clean-targets
:= %clean mrproper cleandocs
263 no-dot-config-targets
:= $(clean-targets
) \
264 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
265 $(version_h
) headers headers_
% archheaders archscripts \
266 %asm-generic kernelversion
%src-pkg dt_binding_check \
268 no-sync-config-targets
:= $(no-dot-config-targets
) %install kernelrelease
269 single-targets
:= %.a
%.i
%.ko
%.lds
%.ll
%.lst
%.mod
%.o
%.s
%.symtypes
%/
277 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
278 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
283 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
284 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
289 ifneq ($(KBUILD_EXTMOD
),)
293 ifeq ($(KBUILD_EXTMOD
),)
294 ifneq ($(filter %config
,$(MAKECMDGOALS
)),)
296 ifneq ($(words $(MAKECMDGOALS
)),1)
302 # We cannot build single targets and the others at the same time
303 ifneq ($(filter $(single-targets
), $(MAKECMDGOALS
)),)
305 ifneq ($(filter-out $(single-targets
), $(MAKECMDGOALS
)),)
310 # For "make -j clean all", "make -j mrproper defconfig all", etc.
311 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
312 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
317 # install and modules_install need also be processed one by one
318 ifneq ($(filter install,$(MAKECMDGOALS
)),)
319 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
325 # ===========================================================================
326 # We're called with mixed targets (*config and build targets).
327 # Handle them one by one.
329 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
331 $(MAKECMDGOALS
): __build_one_by_one
336 for i in
$(MAKECMDGOALS
); do \
337 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
342 include scripts
/Kbuild.
include
344 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
345 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
346 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
347 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
349 include scripts
/subarch.
include
351 # Cross compiling and selecting different set of gcc/bin-utils
352 # ---------------------------------------------------------------------------
354 # When performing cross compilation for other architectures ARCH shall be set
355 # to the target architecture. (See arch/* for the possibilities).
356 # ARCH can be set during invocation of make:
358 # Another way is to have ARCH set in the environment.
359 # The default ARCH is the host where make is executed.
361 # CROSS_COMPILE specify the prefix used for all executables used
362 # during compilation. Only gcc and related bin-utils executables
363 # are prefixed with $(CROSS_COMPILE).
364 # CROSS_COMPILE can be set on the command line
365 # make CROSS_COMPILE=ia64-linux-
366 # Alternatively CROSS_COMPILE can be set in the environment.
367 # Default value for CROSS_COMPILE is not to prefix executables
368 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
371 # Architecture as present in compile.h
372 UTS_MACHINE
:= $(ARCH
)
375 # Additional ARCH settings for x86
379 ifeq ($(ARCH
),x86_64
)
383 # Additional ARCH settings for sparc
384 ifeq ($(ARCH
),sparc32
)
387 ifeq ($(ARCH
),sparc64
)
391 # Additional ARCH settings for sh
396 KCONFIG_CONFIG ?
= .config
397 export KCONFIG_CONFIG
399 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
400 export KBUILD_DEFCONFIG
:= defconfig
402 # SHELL used by kbuild
405 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
406 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
407 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
417 export KBUILD_USERCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes \
418 -O2
-fomit-frame-pointer
-std
=gnu89
419 export KBUILD_USERLDFLAGS
:=
421 KBUILD_HOSTCFLAGS
:= $(KBUILD_USERCFLAGS
) $(HOST_LFS_CFLAGS
) $(HOSTCFLAGS
)
422 KBUILD_HOSTCXXFLAGS
:= -Wall
-O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
423 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
424 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
426 # Make variables (CC, etc...)
433 OBJCOPY
= llvm-objcopy
434 OBJDUMP
= llvm-objdump
435 READELF
= llvm-readelf
438 CC
= $(CROSS_COMPILE
)gcc
439 LD
= $(CROSS_COMPILE
)ld
440 AR
= $(CROSS_COMPILE
)ar
441 NM
= $(CROSS_COMPILE
)nm
442 OBJCOPY
= $(CROSS_COMPILE
)objcopy
443 OBJDUMP
= $(CROSS_COMPILE
)objdump
444 READELF
= $(CROSS_COMPILE
)readelf
445 STRIP
= $(CROSS_COMPILE
)strip
448 RESOLVE_BTFIDS
= $(objtree
)/tools
/bpf
/resolve_btfids
/resolve_btfids
452 INSTALLKERNEL
:= installkernel
466 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
467 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
476 # Use USERINCLUDE when you must reference the UAPI directories only.
478 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
479 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
480 -I
$(srctree
)/include/uapi \
481 -I
$(objtree
)/include/generated
/uapi \
482 -include $(srctree
)/include/linux
/kconfig.h
484 # Use LINUXINCLUDE when you must reference the include/ directory.
485 # Needed to be compatible with the O= option
487 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
488 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
489 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
490 -I
$(objtree
)/include \
493 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
494 KBUILD_CFLAGS
:= -Wall
-Wundef
-Werror
=strict-prototypes
-Wno-trigraphs \
495 -fno-strict-aliasing
-fno-common
-fshort-wchar
-fno-PIE \
496 -Werror
=implicit-function-declaration
-Werror
=implicit-int \
497 -Werror
=return-type
-Wno-format-security \
499 KBUILD_CPPFLAGS
:= -D__KERNEL__
500 KBUILD_AFLAGS_KERNEL
:=
501 KBUILD_CFLAGS_KERNEL
:=
502 KBUILD_AFLAGS_MODULE
:= -DMODULE
503 KBUILD_CFLAGS_MODULE
:= -DMODULE
504 KBUILD_LDFLAGS_MODULE
:=
508 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
509 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
510 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
511 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
512 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
514 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
515 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
516 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
517 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
518 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
520 # Files to ignore in find ... statements
522 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
523 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
525 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
526 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
528 # ===========================================================================
529 # Rules shared between *config targets and build targets
531 # Basic helpers built in scripts/basic/
532 PHONY
+= scripts_basic
534 $(Q
)$(MAKE
) $(build
)=scripts
/basic
535 $(Q
)rm -f .tmp_quiet_recordmcount
537 PHONY
+= outputmakefile
538 # Before starting out-of-tree build, make sure the source tree is clean.
539 # outputmakefile generates a Makefile in the output directory, if using a
540 # separate output directory. This allows convenient use of make in the
542 # At the same time when output Makefile generated, generate .gitignore to
543 # ignore whole output directory
545 ifdef building_out_of_srctree
546 $(Q
)if
[ -f
$(srctree
)/.config
-o \
547 -d
$(srctree
)/include/config
-o \
548 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
550 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
551 echo
>&2 "*** in $(abs_srctree)";\
555 $(Q
)ln
-fsn
$(srctree
) source
556 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile
$(srctree
)
557 $(Q
)test -e .gitignore || \
558 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
561 ifneq ($(shell $(CC
) --version
2>&1 | head
-n
1 | grep clang
),)
562 ifneq ($(CROSS_COMPILE
),)
563 CLANG_FLAGS
+= --target
=$(notdir $(CROSS_COMPILE
:%-=%))
564 GCC_TOOLCHAIN_DIR
:= $(dir $(shell which
$(CROSS_COMPILE
)elfedit
))
565 CLANG_FLAGS
+= --prefix=$(GCC_TOOLCHAIN_DIR
)$(notdir $(CROSS_COMPILE
))
566 GCC_TOOLCHAIN
:= $(realpath
$(GCC_TOOLCHAIN_DIR
)/..
)
568 ifneq ($(GCC_TOOLCHAIN
),)
569 CLANG_FLAGS
+= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
571 ifneq ($(LLVM_IAS
),1)
572 CLANG_FLAGS
+= -no-integrated-as
574 CLANG_FLAGS
+= -Werror
=unknown-warning-option
575 KBUILD_CFLAGS
+= $(CLANG_FLAGS
)
576 KBUILD_AFLAGS
+= $(CLANG_FLAGS
)
580 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
581 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
582 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
583 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
584 CC_VERSION_TEXT
= $(shell $(CC
) --version
2>/dev
/null | head
-n
1)
587 # ===========================================================================
588 # *config targets only - make sure prerequisites are updated, and descend
589 # in scripts/kconfig to make the *config target
591 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
592 # KBUILD_DEFCONFIG may point out an alternative default configuration
593 # used for 'make defconfig'
594 include arch
/$(SRCARCH
)/Makefile
595 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
597 config
: outputmakefile scripts_basic FORCE
598 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
600 %config
: outputmakefile scripts_basic FORCE
601 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
604 # ===========================================================================
605 # Build targets only - this includes vmlinux, arch specific targets, clean
606 # targets and others. In general all targets except *config targets.
608 # If building an external module we do not care about the all: rule
609 # but instead __all depend on modules
611 ifeq ($(KBUILD_EXTMOD
),)
617 # Decide whether to build built-in, modular, or both.
618 # Normally, just do built-in.
623 # If we have only "make modules", don't compile built-in objects.
624 ifeq ($(MAKECMDGOALS
),modules
)
628 # If we have "make <whatever> modules", compile modules
629 # in addition to whatever we do anyway.
630 # Just "make" or "make all" shall build modules as well
632 ifneq ($(filter all modules nsdeps
%compile_commands.json clang-
%,$(MAKECMDGOALS
)),)
636 ifeq ($(MAKECMDGOALS
),)
640 export KBUILD_MODULES KBUILD_BUILTIN
643 include include/config
/auto.conf
646 ifeq ($(KBUILD_EXTMOD
),)
647 # Objects we will link into vmlinux / subdirs we need to visit
649 drivers-y
:= drivers
/ sound
/
650 drivers-
$(CONFIG_SAMPLES
) += samples
/
651 drivers-
$(CONFIG_NET
) += net
/
654 endif # KBUILD_EXTMOD
656 # The all: target is the default when no target is given on the
658 # This allow a user to issue only 'make' to build a kernel including modules
659 # Defaults to vmlinux, but the arch makefile usually adds further targets
662 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage \
663 $(call cc-option
,-fno-tree-loop-im
) \
664 $(call cc-disable-warning
,maybe-uninitialized
,)
667 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
668 ifdef CONFIG_FUNCTION_TRACER
669 CC_FLAGS_FTRACE
:= -pg
672 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
673 RETPOLINE_VDSO_CFLAGS_GCC
:= -mindirect-branch
=thunk-inline
-mindirect-branch-register
674 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
675 RETPOLINE_VDSO_CFLAGS_CLANG
:= -mretpoline
676 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
677 RETPOLINE_VDSO_CFLAGS
:= $(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_CLANG
)))
678 export RETPOLINE_CFLAGS
679 export RETPOLINE_VDSO_CFLAGS
681 include arch
/$(SRCARCH
)/Makefile
684 ifdef may-sync-config
685 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
686 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
687 # because some architectures define CROSS_COMPILE there.
688 include include/config
/auto.conf.cmd
692 @echo
>&2 '*** Configuration file "$@" not found!'
694 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
695 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
699 # The actual configuration files used during the build are stored in
700 # include/generated/ and include/config/. Update them if .config is newer than
701 # include/config/auto.conf (which mirrors .config).
703 # This exploits the 'multi-target pattern rule' trick.
704 # The syncconfig should be executed only once to make all the targets.
705 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
706 quiet_cmd_syncconfig
= SYNC
$@
707 cmd_syncconfig
= $(MAKE
) -f
$(srctree
)/Makefile syncconfig
709 %/config
/auto.conf
%/config
/auto.conf.cmd
%/generated
/autoconf.h
: $(KCONFIG_CONFIG
)
710 +$(call cmd
,syncconfig
)
711 else # !may-sync-config
712 # External modules and some install targets need include/generated/autoconf.h
713 # and include/config/auto.conf but do not care if they are up-to-date.
714 # Use auto.conf to trigger the test
715 PHONY
+= include/config
/auto.conf
717 include/config
/auto.conf
:
718 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
720 echo
>&2 " ERROR: Kernel configuration is invalid."; \
721 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
722 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
726 endif # may-sync-config
729 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
730 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
731 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
732 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
733 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
735 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
737 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
739 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
743 # Tell gcc to never replace conditional load with a non-conditional one
744 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
745 KBUILD_CFLAGS
+= $(call cc-option
,-fno-allow-store-data-races
)
747 ifdef CONFIG_READABLE_ASM
748 # Disable optimizations that make assembler listings hard to read.
749 # reorder blocks reorders the control in the function
750 # ipa clone creates specialized cloned functions
751 # partial inlining inlines only parts of functions
752 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
753 $(call cc-option
,-fno-ipa-cp-clone
,) \
754 $(call cc-option
,-fno-partial-inlining
)
757 ifneq ($(CONFIG_FRAME_WARN
),0)
758 KBUILD_CFLAGS
+= -Wframe-larger-than
=$(CONFIG_FRAME_WARN
)
761 stackp-flags-y
:= -fno-stack-protector
762 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
763 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
765 KBUILD_CFLAGS
+= $(stackp-flags-y
)
767 ifdef CONFIG_CC_IS_CLANG
768 KBUILD_CPPFLAGS
+= -Qunused-arguments
769 KBUILD_CFLAGS
+= -Wno-format-invalid-specifier
770 KBUILD_CFLAGS
+= -Wno-gnu
771 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
772 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
773 # See modpost pattern 2
774 KBUILD_CFLAGS
+= -mno-global-merge
777 # These warnings generated too much noise in a regular build.
778 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
779 KBUILD_CFLAGS
+= -Wno-unused-but-set-variable
781 # Warn about unmarked fall-throughs in switch statement.
782 # Disabled for clang while comment to attribute conversion happens and
783 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
784 KBUILD_CFLAGS
+= $(call cc-option
,-Wimplicit-fallthrough
,)
787 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
788 ifdef CONFIG_FRAME_POINTER
789 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
791 # Some targets (ARM with Thumb2, for example), can't be built with frame
792 # pointers. For those, we don't have FUNCTION_TRACER automatically
793 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
794 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
795 # -fomit-frame-pointer with FUNCTION_TRACER.
796 ifndef CONFIG_FUNCTION_TRACER
797 KBUILD_CFLAGS
+= -fomit-frame-pointer
801 # Initialize all stack variables with a 0xAA pattern.
802 ifdef CONFIG_INIT_STACK_ALL_PATTERN
803 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
806 # Initialize all stack variables with a zero value.
807 ifdef CONFIG_INIT_STACK_ALL_ZERO
808 # Future support for zero initialization is still being debated, see
809 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
810 # renamed or dropped.
811 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=zero
812 KBUILD_CFLAGS
+= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
817 # Workaround for GCC versions < 5.0
818 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
819 ifdef CONFIG_CC_IS_GCC
820 DEBUG_CFLAGS
+= $(call cc-ifversion
, -lt
, 0500, $(call cc-option
, -fno-var-tracking-assignments
))
823 ifdef CONFIG_DEBUG_INFO
825 ifdef CONFIG_DEBUG_INFO_SPLIT
826 DEBUG_CFLAGS
+= -gsplit-dwarf
831 ifneq ($(LLVM_IAS
),1)
832 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
835 ifdef CONFIG_DEBUG_INFO_DWARF4
836 DEBUG_CFLAGS
+= -gdwarf-4
839 ifdef CONFIG_DEBUG_INFO_REDUCED
840 DEBUG_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
841 $(call cc-option
,-fno-var-tracking
)
844 ifdef CONFIG_DEBUG_INFO_COMPRESSED
845 DEBUG_CFLAGS
+= -gz
=zlib
846 KBUILD_AFLAGS
+= -gz
=zlib
847 KBUILD_LDFLAGS
+= --compress-debug-sections
=zlib
850 endif # CONFIG_DEBUG_INFO
852 KBUILD_CFLAGS
+= $(DEBUG_CFLAGS
)
855 ifdef CONFIG_FUNCTION_TRACER
856 ifdef CONFIG_FTRACE_MCOUNT_RECORD
857 # gcc 5 supports generating the mcount tables directly
858 ifeq ($(call cc-option-yn
,-mrecord-mcount
),y
)
859 CC_FLAGS_FTRACE
+= -mrecord-mcount
860 export CC_USING_RECORD_MCOUNT
:= 1
862 ifdef CONFIG_HAVE_NOP_MCOUNT
863 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
864 CC_FLAGS_FTRACE
+= -mnop-mcount
865 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
869 ifdef CONFIG_HAVE_FENTRY
870 ifeq ($(call cc-option-yn
, -mfentry
),y
)
871 CC_FLAGS_FTRACE
+= -mfentry
872 CC_FLAGS_USING
+= -DCC_USING_FENTRY
875 export CC_FLAGS_FTRACE
876 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
877 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
878 ifdef CONFIG_DYNAMIC_FTRACE
879 ifdef CONFIG_HAVE_C_RECORDMCOUNT
880 BUILD_C_RECORDMCOUNT
:= y
881 export BUILD_C_RECORDMCOUNT
886 # We trigger additional mismatches with less inlining
887 ifdef CONFIG_DEBUG_SECTION_MISMATCH
888 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
891 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
892 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
893 LDFLAGS_vmlinux
+= --gc-sections
896 ifdef CONFIG_SHADOW_CALL_STACK
897 CC_FLAGS_SCS
:= -fsanitize
=shadow-call-stack
898 KBUILD_CFLAGS
+= $(CC_FLAGS_SCS
)
902 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
903 KBUILD_CFLAGS
+= -falign-functions
=32
906 # arch Makefile may override CC so keep this after arch Makefile is included
907 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
909 # warn about C99 declaration after statement
910 KBUILD_CFLAGS
+= -Wdeclaration-after-statement
912 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
913 KBUILD_CFLAGS
+= -Wvla
915 # disable pointer signed / unsigned warnings in gcc 4.0
916 KBUILD_CFLAGS
+= -Wno-pointer-sign
918 # disable stringop warnings in gcc 8+
919 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
921 # We'll want to enable this eventually, but it's not going away for 5.7 at least
922 KBUILD_CFLAGS
+= $(call cc-disable-warning
, zero-length-bounds
)
923 KBUILD_CFLAGS
+= $(call cc-disable-warning
, array-bounds
)
924 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-overflow
)
926 # Another good warning that we'll want to enable eventually
927 KBUILD_CFLAGS
+= $(call cc-disable-warning
, restrict
)
929 # Enabled with W=2, disabled by default as noisy
930 KBUILD_CFLAGS
+= $(call cc-disable-warning
, maybe-uninitialized
)
932 # disable invalid "can't wrap" optimizations for signed / pointers
933 KBUILD_CFLAGS
+= -fno-strict-overflow
935 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
936 KBUILD_CFLAGS
+= -fno-stack-check
938 # conserve stack if available
939 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
941 # Prohibit date/time macros, which would make the build non-deterministic
942 KBUILD_CFLAGS
+= -Werror
=date-time
944 # enforce correct pointer usage
945 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
947 # Require designated initializers for all marked structures
948 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
950 # change __FILE__ to the relative path from the srctree
951 KBUILD_CPPFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
953 # include additional Makefiles when needed
954 include-y
:= scripts
/Makefile.extrawarn
955 include-
$(CONFIG_KASAN
) += scripts
/Makefile.kasan
956 include-
$(CONFIG_KCSAN
) += scripts
/Makefile.kcsan
957 include-
$(CONFIG_UBSAN
) += scripts
/Makefile.ubsan
958 include-
$(CONFIG_KCOV
) += scripts
/Makefile.kcov
959 include-
$(CONFIG_GCC_PLUGINS
) += scripts
/Makefile.gcc-plugins
961 include $(addprefix $(srctree
)/, $(include-y
))
963 # scripts/Makefile.gcc-plugins is intentionally included last.
964 # Do not add $(call cc-option,...) below this line. When you build the kernel
965 # from the clean source tree, the GCC plugins do not exist at this point.
967 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
968 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
969 KBUILD_AFLAGS
+= $(KAFLAGS
)
970 KBUILD_CFLAGS
+= $(KCFLAGS
)
972 KBUILD_LDFLAGS_MODULE
+= --build-id
=sha1
973 LDFLAGS_vmlinux
+= --build-id
=sha1
975 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
976 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
979 ifeq ($(CONFIG_RELR
),y
)
980 LDFLAGS_vmlinux
+= --pack-dyn-relocs
=relr
983 # We never want expected sections to be placed heuristically by the
984 # linker. All sections should be explicitly named in the linker script.
985 ifdef CONFIG_LD_ORPHAN_WARN
986 LDFLAGS_vmlinux
+= --orphan-handling
=warn
989 # Align the bit size of userspace programs with the kernel
990 KBUILD_USERCFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
991 KBUILD_USERLDFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
993 # make the checker run with the right architecture
994 CHECKFLAGS
+= --arch
=$(ARCH
)
996 # insure the checker run with the right endianness
997 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
999 # the checker needs the correct machine size
1000 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
1002 # Default kernel image to build when no specific target is given.
1003 # KBUILD_IMAGE may be overruled on the command line or
1004 # set in the environment
1005 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1006 # this default value
1007 export KBUILD_IMAGE ?
= vmlinux
1010 # INSTALL_PATH specifies where to place the updated kernel and system map
1011 # images. Default is /boot, but you can set it to other values
1012 export INSTALL_PATH ?
= /boot
1015 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1016 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1017 # an argument if needed. Otherwise it defaults to the kernel install path
1019 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
1022 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1023 # relocations required by build roots. This is not defined in the
1024 # makefile but the argument can be passed to make if needed.
1027 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
1031 # INSTALL_MOD_STRIP, if defined, will cause modules to be
1032 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1033 # the default option --strip-debug will be used. Otherwise,
1034 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1036 ifdef INSTALL_MOD_STRIP
1037 ifeq ($(INSTALL_MOD_STRIP
),1)
1038 mod_strip_cmd
= $(STRIP
) --strip-debug
1040 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
1041 endif # INSTALL_MOD_STRIP=1
1043 mod_strip_cmd
= true
1044 endif # INSTALL_MOD_STRIP
1045 export mod_strip_cmd
1047 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1048 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1049 # or CONFIG_MODULE_COMPRESS_XZ.
1051 mod_compress_cmd
= true
1052 ifdef CONFIG_MODULE_COMPRESS
1053 ifdef CONFIG_MODULE_COMPRESS_GZIP
1054 mod_compress_cmd
= $(KGZIP
) -n
-f
1055 endif # CONFIG_MODULE_COMPRESS_GZIP
1056 ifdef CONFIG_MODULE_COMPRESS_XZ
1057 mod_compress_cmd
= $(XZ
) -f
1058 endif # CONFIG_MODULE_COMPRESS_XZ
1059 endif # CONFIG_MODULE_COMPRESS
1060 export mod_compress_cmd
1062 ifdef CONFIG_MODULE_SIG_ALL
1063 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
1065 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
1071 HOST_LIBELF_LIBS
= $(shell pkg-config libelf
--libs
2>/dev
/null || echo
-lelf
)
1073 has_libelf
= $(call try-run
,\
1074 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
$(HOST_LIBELF_LIBS
) -,1,0)
1076 ifdef CONFIG_STACK_VALIDATION
1077 ifeq ($(has_libelf
),1)
1078 objtool_target
:= tools
/objtool FORCE
1080 SKIP_STACK_VALIDATION
:= 1
1081 export SKIP_STACK_VALIDATION
1085 PHONY
+= resolve_btfids_clean
1087 resolve_btfids_O
= $(abspath
$(objtree
))/tools
/bpf
/resolve_btfids
1089 # tools/bpf/resolve_btfids directory might not exist
1090 # in output directory, skip its clean in that case
1091 resolve_btfids_clean
:
1092 ifneq ($(wildcard $(resolve_btfids_O
)),)
1093 $(Q
)$(MAKE
) -sC
$(srctree
)/tools
/bpf
/resolve_btfids O
=$(resolve_btfids_O
) clean
1097 ifdef CONFIG_DEBUG_INFO_BTF
1098 ifeq ($(has_libelf
),1)
1099 resolve_btfids_target
:= tools
/bpf
/resolve_btfids FORCE
1101 ERROR_RESOLVE_BTFIDS
:= 1
1103 endif # CONFIG_DEBUG_INFO_BTF
1108 export MODORDER
:= $(extmod-prefix
)modules.order
1109 export MODULES_NSDEPS
:= $(extmod-prefix
)modules.nsdeps
1111 ifeq ($(KBUILD_EXTMOD
),)
1112 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
1114 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, \
1115 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
1116 $(libs-y
) $(libs-m
)))
1118 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) Documentation \
1119 $(patsubst %/,%,$(filter %/, $(core-
) \
1120 $(drivers-
) $(libs-
))))
1122 subdir-modorder
:= $(addsuffix modules.order
,$(filter %/, \
1123 $(core-y
) $(core-m
) $(libs-y
) $(libs-m
) \
1124 $(drivers-y
) $(drivers-m
)))
1126 build-dirs
:= $(vmlinux-dirs
)
1127 clean-dirs
:= $(vmlinux-alldirs
)
1129 # Externally visible symbols (used by link-vmlinux.sh)
1130 KBUILD_VMLINUX_OBJS
:= $(head-y
) $(patsubst %/,%/built-in.a
, $(core-y
))
1131 KBUILD_VMLINUX_OBJS
+= $(addsuffix built-in.a
, $(filter %/, $(libs-y
)))
1132 ifdef CONFIG_MODULES
1133 KBUILD_VMLINUX_OBJS
+= $(patsubst %/, %/lib.a
, $(filter %/, $(libs-y
)))
1134 KBUILD_VMLINUX_LIBS
:= $(filter-out %/, $(libs-y
))
1136 KBUILD_VMLINUX_LIBS
:= $(patsubst %/,%/lib.a
, $(libs-y
))
1138 KBUILD_VMLINUX_OBJS
+= $(patsubst %/,%/built-in.a
, $(drivers-y
))
1140 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1141 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1142 # used by scripts/Makefile.package
1143 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) LICENSES arch
include scripts tools
)
1145 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)
1147 # Recurse until adjust_autoksyms.sh is satisfied
1148 PHONY
+= autoksyms_recursive
1149 ifdef CONFIG_TRIM_UNUSED_KSYMS
1150 # For the kernel to actually contain only the needed exported symbols,
1151 # we have to build modules as well to determine what those symbols are.
1152 # (this can be evaluated only once include/config/auto.conf has been included)
1155 autoksyms_recursive
: descend modules.order
1156 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1157 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1160 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1162 quiet_cmd_autoksyms_h
= GEN
$@
1163 cmd_autoksyms_h
= mkdir
-p
$(dir $@
); \
1164 $(CONFIG_SHELL
) $(srctree
)/scripts
/gen_autoksyms.sh
$@
1167 $(call cmd
,autoksyms_h
)
1169 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1171 # Final link of vmlinux with optional arch pass after final link
1172 cmd_link-vmlinux
= \
1173 $(CONFIG_SHELL
) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1174 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1176 vmlinux
: scripts
/link-vmlinux.sh autoksyms_recursive
$(vmlinux-deps
) FORCE
1177 +$(call if_changed
,link-vmlinux
)
1181 # The actual objects are generated when descending,
1182 # make sure no implicit rule kicks in
1183 $(sort $(vmlinux-deps
) $(subdir-modorder
)): descend
;
1185 filechk_kernel.release
= \
1186 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1188 # Store (new) KERNELRELEASE string in include/config/kernel.release
1189 include/config
/kernel.release
: FORCE
1190 $(call filechk
,kernel.release
)
1192 # Additional helpers built in scripts/
1193 # Carefully list dependencies so we do not try to build scripts twice
1196 scripts
: scripts_basic scripts_dtc
1197 $(Q
)$(MAKE
) $(build
)=$(@
)
1199 # Things we need to do before we recursively start building the kernel
1200 # or the modules are listed in "prepare".
1201 # A multi level approach is used. prepareN is processed before prepareN-1.
1202 # archprepare is used in arch Makefiles and when processed asm symlink,
1203 # version.h and scripts_basic is processed / created.
1205 PHONY
+= prepare archprepare
1207 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1208 asm-generic
$(version_h
) $(autoksyms_h
) include/generated
/utsrelease.h \
1209 include/generated
/autoconf.h
1211 prepare0
: archprepare
1212 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1213 $(Q
)$(MAKE
) $(build
)=.
1215 # All the preparing..
1216 prepare
: prepare0 prepare-objtool prepare-resolve_btfids
1218 # Support for using generic headers in asm-generic
1219 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1221 PHONY
+= asm-generic uapi-asm-generic
1222 asm-generic
: uapi-asm-generic
1223 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1224 generic
=include/asm-generic
1226 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1227 generic
=include/uapi
/asm-generic
1229 PHONY
+= prepare-objtool prepare-resolve_btfids
1230 prepare-objtool
: $(objtool_target
)
1231 ifeq ($(SKIP_STACK_VALIDATION
),1)
1232 ifdef CONFIG_UNWINDER_ORC
1233 @echo
"error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1236 @echo
"warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1240 prepare-resolve_btfids
: $(resolve_btfids_target
)
1241 ifeq ($(ERROR_RESOLVE_BTFIDS
),1)
1242 @echo
"error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1245 # Generate some files
1246 # ---------------------------------------------------------------------------
1248 # KERNELRELEASE can change from a few different places, meaning version.h
1249 # needs to be updated, so this check is forced on all builds
1252 define filechk_utsrelease.h
1253 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1254 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1257 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1260 define filechk_version.h
1261 echo \
#define LINUX_VERSION_CODE $(shell \
1262 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1263 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1267 $(call filechk
,version.h
)
1268 $(Q
)rm -f
$(old_version_h
)
1270 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1271 $(call filechk
,utsrelease.h
)
1275 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1276 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1278 # ---------------------------------------------------------------------------
1281 #Default location for installed headers
1282 export INSTALL_HDR_PATH
= $(objtree
)/usr
1284 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1285 cmd_headers_install
= \
1286 mkdir
-p
$(INSTALL_HDR_PATH
); \
1287 rsync
-mrl
--include='*/' --include='*\.h' --exclude
='*' \
1288 usr
/include $(INSTALL_HDR_PATH
)
1290 PHONY
+= headers_install
1291 headers_install
: headers
1292 $(call cmd
,headers_install
)
1294 PHONY
+= archheaders archscripts
1296 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1299 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1300 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1301 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1302 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1303 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1305 # Deprecated. It is no-op now.
1306 PHONY
+= headers_check
1310 ifdef CONFIG_HEADERS_INSTALL
1314 PHONY
+= scripts_unifdef
1315 scripts_unifdef
: scripts_basic
1316 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1318 # ---------------------------------------------------------------------------
1323 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1326 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1328 PHONY
+= kselftest-merge
1330 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1331 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config | \
1332 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-m
$(objtree
)/.config
1333 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1335 # ---------------------------------------------------------------------------
1338 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1339 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1344 %.dtb
: include/config
/kernel.release scripts_dtc
1345 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1347 %.dtbo
: include/config
/kernel.release scripts_dtc
1348 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1350 PHONY
+= dtbs dtbs_install dtbs_check
1351 dtbs
: include/config
/kernel.release scripts_dtc
1352 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1354 ifneq ($(filter dtbs_check
, $(MAKECMDGOALS
)),)
1356 dtbs
: dt_binding_check
1362 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
) dst
=$(INSTALL_DTBS_PATH
)
1364 ifdef CONFIG_OF_EARLY_FLATTREE
1370 PHONY
+= scripts_dtc
1371 scripts_dtc
: scripts_basic
1372 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1374 ifneq ($(filter dt_binding_check
, $(MAKECMDGOALS
)),)
1375 export CHECK_DT_BINDING
=y
1378 PHONY
+= dt_binding_check
1379 dt_binding_check
: scripts_dtc
1380 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1382 # ---------------------------------------------------------------------------
1385 ifdef CONFIG_MODULES
1387 # By default, build modules as well
1391 # When we're building modules with modversions, we need to consider
1392 # the built-in objects during the descend as well, in order to
1393 # make sure the checksums are up to date before we record them.
1394 ifdef CONFIG_MODVERSIONS
1400 # A module can be listed more than once in obj-m resulting in
1401 # duplicate lines in modules.order files. Those are removed
1402 # using awk while concatenating to the final file.
1405 modules
: $(if
$(KBUILD_BUILTIN
),vmlinux
) modules_check modules_prepare
1406 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1408 PHONY
+= modules_check
1409 modules_check
: modules.order
1410 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
$<
1412 cmd_modules_order
= $(AWK
) '!x[$$0]++' $(real-prereqs
) > $@
1414 modules.order
: $(subdir-modorder
) FORCE
1415 $(call if_changed
,modules_order
)
1417 targets
+= modules.order
1419 # Target to prepare building external modules
1420 PHONY
+= modules_prepare
1421 modules_prepare
: prepare
1422 $(Q
)$(MAKE
) $(build
)=scripts scripts
/module.lds
1424 # Target to install modules
1425 PHONY
+= modules_install
1426 modules_install
: _modinst_ _modinst_post
1430 @
rm -rf
$(MODLIB
)/kernel
1431 @
rm -f
$(MODLIB
)/source
1432 @mkdir
-p
$(MODLIB
)/kernel
1433 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1434 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1435 rm -f
$(MODLIB
)/build
; \
1436 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1438 @sed
's:^:kernel/:' modules.order
> $(MODLIB
)/modules.order
1439 @cp
-f modules.builtin
$(MODLIB
)/
1440 @cp
-f
$(objtree
)/modules.builtin.modinfo
$(MODLIB
)/
1441 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1443 # This depmod is only for convenience to give the initial
1444 # boot a modules.dep even before / is mounted read-write. However the
1445 # boot script depmod is the master version.
1446 PHONY
+= _modinst_post
1447 _modinst_post
: _modinst_
1450 ifeq ($(CONFIG_MODULE_SIG
), y
)
1451 PHONY
+= modules_sign
1453 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1456 else # CONFIG_MODULES
1458 # Modules not configured
1459 # ---------------------------------------------------------------------------
1461 PHONY
+= modules modules_install
1462 modules modules_install
:
1464 @echo
>&2 "The present kernel configuration has modules disabled."
1465 @echo
>&2 "Type 'make config' and enable loadable module support."
1466 @echo
>&2 "Then build a kernel with module support enabled."
1470 endif # CONFIG_MODULES
1473 # Cleaning is done on three levels.
1474 # make clean Delete most generated files
1475 # Leave enough to build external modules
1476 # make mrproper Delete the current configuration, and all generated files
1477 # make distclean Remove editor backup files, patch leftover files and the like
1479 # Directories & files removed with 'make clean'
1480 CLEAN_FILES
+= include/ksym vmlinux.symvers \
1481 modules.builtin modules.builtin.modinfo modules.nsdeps \
1482 compile_commands.json
1484 # Directories & files removed with 'make mrproper'
1485 MRPROPER_FILES
+= include/config
include/generated \
1486 arch
/$(SRCARCH
)/include/generated .tmp_objdiff \
1487 debian snap tar-install \
1488 .config .config.old .version \
1490 signing_key.pem signing_key.priv signing_key.x509 \
1491 x509.genkey extra_certificates signing_key.x509.keyid \
1492 signing_key.x509.signer vmlinux-gdb.py \
1495 # Directories & files removed with 'make distclean'
1496 DISTCLEAN_FILES
+= tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS
1498 # clean - Delete most, but leave enough to build external modules
1500 clean: rm-files
:= $(CLEAN_FILES
)
1502 PHONY
+= archclean vmlinuxclean
1505 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1506 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1508 clean: archclean vmlinuxclean resolve_btfids_clean
1510 # mrproper - Delete all generated files, including .config
1512 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1513 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1515 PHONY
+= $(mrproper-dirs
) mrproper
1517 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1519 mrproper
: clean $(mrproper-dirs
)
1524 distclean: rm-files
:= $(wildcard $(DISTCLEAN_FILES
))
1530 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1531 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1532 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1533 -o
-name
'core' \
) \
1534 -type f
-print | xargs
rm -f
1537 # Packaging of the kernel to various formats
1538 # ---------------------------------------------------------------------------
1541 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1542 %pkg
: include/config
/kernel.release FORCE
1543 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1545 # Brief documentation of the typical targets used
1546 # ---------------------------------------------------------------------------
1548 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1549 boards
:= $(sort $(notdir $(boards
)))
1550 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1551 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1555 @echo
'Cleaning targets:'
1556 @echo
' clean - Remove most generated files but keep the config and'
1557 @echo
' enough build support to build external modules'
1558 @echo
' mrproper - Remove all generated files + config + various backup files'
1559 @echo
' distclean - mrproper + remove editor backup and patch files'
1561 @echo
'Configuration targets:'
1562 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1564 @echo
'Other generic targets:'
1565 @echo
' all - Build all targets marked with [*]'
1566 @echo
'* vmlinux - Build the bare kernel'
1567 @echo
'* modules - Build all modules'
1568 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1569 @echo
' dir/ - Build all files in dir and below'
1570 @echo
' dir/file.[ois] - Build specified target only'
1571 @echo
' dir/file.ll - Build the LLVM assembly file'
1572 @echo
' (requires compiler support for LLVM assembly generation)'
1573 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1574 @echo
' (requires a recent binutils and recent build (System.map))'
1575 @echo
' dir/file.ko - Build module including final link'
1576 @echo
' modules_prepare - Set up for building external modules'
1577 @echo
' tags/TAGS - Generate tags file for editors'
1578 @echo
' cscope - Generate cscope index'
1579 @echo
' gtags - Generate GNU GLOBAL index'
1580 @echo
' kernelrelease - Output the release version string (use with make -s)'
1581 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1582 @echo
' image_name - Output the image name (use with make -s)'
1583 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1584 echo
' (default: $(INSTALL_HDR_PATH))'; \
1586 @echo
'Static analysers:'
1587 @echo
' checkstack - Generate a list of stack hogs'
1588 @echo
' versioncheck - Sanity check on version.h usage'
1589 @echo
' includecheck - Check for duplicate included header files'
1590 @echo
' export_report - List the usages of all exported symbols'
1591 @echo
' headerdep - Detect inclusion cycles in headers'
1592 @echo
' coccicheck - Check with Coccinelle'
1593 @echo
' clang-analyzer - Check with clang static analyzer'
1594 @echo
' clang-tidy - Check with clang-tidy'
1597 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1599 @echo
'Kernel selftest:'
1600 @echo
' kselftest - Build and run kernel selftest'
1601 @echo
' Build, install, and boot kernel before'
1602 @echo
' running kselftest on it'
1603 @echo
' Run as root for full coverage'
1604 @echo
' kselftest-all - Build kernel selftest'
1605 @echo
' kselftest-install - Build and install kernel selftest'
1606 @echo
' kselftest-clean - Remove all generated kselftest files'
1607 @echo
' kselftest-merge - Merge all the config dependencies of'
1608 @echo
' kselftest to existing .config.'
1611 echo
'Devicetree:'; \
1612 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1613 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1614 echo
' dt_binding_check - Validate device tree binding documents'; \
1615 echo
' dtbs_check - Validate device tree source files';\
1618 @echo
'Userspace tools targets:'
1619 @echo
' use "make tools/help"'
1620 @echo
' or "cd tools; make help"'
1622 @echo
'Kernel packaging:'
1623 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1625 @echo
'Documentation targets:'
1626 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1628 @echo
'Architecture specific targets ($(SRCARCH)):'
1629 @
$(if
$(archhelp
),$(archhelp
),\
1630 echo
' No architecture specific help defined for $(SRCARCH)')
1633 $(foreach b
, $(boards
), \
1634 printf
" %-27s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1636 @
$(if
$(board-dirs
), \
1637 $(foreach b
, $(board-dirs
), \
1638 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1639 printf
" %-16s - Show all of the above\\n" help-boards
; \
1642 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1643 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1644 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1645 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK'
1646 @echo
' (sparse by default)'
1647 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1648 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1649 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1650 @echo
' 1: warnings which may be relevant and do not occur too often'
1651 @echo
' 2: warnings which occur quite often but may still be relevant'
1652 @echo
' 3: more obscure warnings, can most likely be ignored'
1653 @echo
' Multiple levels can be combined with W=12 or W=123'
1655 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1656 @echo
'For further info see the ./README file'
1659 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1661 help-boards
: $(help-board-dirs
)
1663 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1665 $(help-board-dirs
): help-
%:
1666 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1667 @
$(if
$(boards-per-dir
), \
1668 $(foreach b
, $(boards-per-dir
), \
1669 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1673 # Documentation targets
1674 # ---------------------------------------------------------------------------
1675 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1676 linkcheckdocs dochelp refcheckdocs
1677 PHONY
+= $(DOC_TARGETS
)
1679 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1682 # ---------------------------------------------------------------------------
1684 PHONY
+= scripts_gdb
1685 scripts_gdb
: prepare0
1686 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1687 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1689 ifdef CONFIG_GDB_SCRIPTS
1693 else # KBUILD_EXTMOD
1696 # External module support.
1697 # When building external modules the kernel used as basis is considered
1698 # read-only, and no consistency checks are made and the make
1699 # system is not used on the basis kernel. If updates are required
1700 # in the basis kernel ordinary make commands (without M=...) must
1703 # The following are the only valid targets when building external
1705 # make M=dir clean Delete all automatically generated files
1706 # make M=dir modules Make all modules in specified dir
1707 # make M=dir Same as 'make M=dir modules'
1708 # make M=dir modules_install
1709 # Install the modules built in the module directory
1710 # Assumes install directory is already created
1712 # We are always building only modules.
1716 build-dirs
:= $(KBUILD_EXTMOD
)
1718 modules
: $(MODORDER
)
1719 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1721 $(MODORDER
): descend
1724 PHONY
+= modules_install
1725 modules_install
: _emodinst_ _emodinst_post
1727 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1730 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1731 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1733 PHONY
+= _emodinst_post
1734 _emodinst_post
: _emodinst_
1737 compile_commands.json
: $(extmod-prefix
)compile_commands.json
1738 PHONY
+= compile_commands.json
1740 clean-dirs
:= $(KBUILD_EXTMOD
)
1741 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
$(KBUILD_EXTMOD
)/modules.nsdeps \
1742 $(KBUILD_EXTMOD
)/compile_commands.json
1746 @echo
' Building external modules.'
1747 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1749 @echo
' modules - default target, build the module(s)'
1750 @echo
' modules_install - install the module'
1751 @echo
' clean - remove generated files in module directory only'
1754 # no-op for external module builds
1755 PHONY
+= prepare modules_prepare
1757 endif # KBUILD_EXTMOD
1760 # ---------------------------------------------------------------------------
1761 # To build individual files in subdirectories, you can do like this:
1763 # make foo/bar/baz.s
1765 # The supported suffixes for single-target are listed in 'single-targets'
1767 # To build only under specific subdirectories, you can do like this:
1773 # .ko is special because modpost is needed
1774 single-ko
:= $(sort $(filter %.ko
, $(MAKECMDGOALS
)))
1775 single-no-ko
:= $(sort $(patsubst %.ko
,%.mod
, $(MAKECMDGOALS
)))
1777 $(single-ko
): single_modpost
1779 $(single-no-ko
): descend
1782 ifeq ($(KBUILD_EXTMOD
),)
1783 # For the single build of in-tree modules, use a temporary file to avoid
1784 # the situation of modules_install installing an invalid modules.order.
1785 MODORDER
:= .modules.tmp
1788 PHONY
+= single_modpost
1789 single_modpost
: $(single-no-ko
) modules_prepare
1790 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod-prefix
)$m;) } > $(MODORDER
)
1791 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1795 export KBUILD_SINGLE_TARGETS
:= $(addprefix $(extmod-prefix
), $(single-no-ko
))
1797 # trim unrelated directories
1798 build-dirs
:= $(foreach d
, $(build-dirs
), \
1799 $(if
$(filter $(d
)/%, $(KBUILD_SINGLE_TARGETS
)), $(d
)))
1803 ifndef CONFIG_MODULES
1807 # Handle descending into subdirectories listed in $(build-dirs)
1808 # Preset locale variables to speed up the build process. Limit locale
1809 # tweaks to this spot to avoid wrong language settings when running
1810 # make menuconfig etc.
1811 # Error messages still appears in the original language
1812 PHONY
+= descend
$(build-dirs
)
1813 descend
: $(build-dirs
)
1814 $(build-dirs
): prepare
1815 $(Q
)$(MAKE
) $(build
)=$@ \
1816 single-build
=$(if
$(filter-out $@
/, $(filter $@
/%, $(KBUILD_SINGLE_TARGETS
))),1) \
1817 need-builtin
=1 need-modorder
=1
1819 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
1820 PHONY
+= $(clean-dirs
) clean
1822 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1824 clean: $(clean-dirs
)
1826 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1827 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1829 -o
-name
'*.dtb' -o
-name
'*.dtbo' -o
-name
'*.dtb.S' -o
-name
'*.dt.yaml' \
1830 -o
-name
'*.dwo' -o
-name
'*.lst' \
1831 -o
-name
'*.su' -o
-name
'*.mod' \
1832 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1833 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1834 -o
-name
'*.asn1.[ch]' \
1835 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1836 -o
-name
'.tmp_*.o.*' \
1837 -o
-name
'*.c.[012]*.*' \
1839 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1841 # Generate tags for editors
1842 # ---------------------------------------------------------------------------
1843 quiet_cmd_tags
= GEN
$@
1844 cmd_tags
= $(BASH
) $(srctree
)/scripts
/tags.sh
$@
1846 tags TAGS cscope gtags
: FORCE
1849 # Script to generate missing namespace dependencies
1850 # ---------------------------------------------------------------------------
1853 nsdeps
: export KBUILD_NSDEPS
=1
1855 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/nsdeps
1858 # ---------------------------------------------------------------------------
1860 quiet_cmd_gen_compile_commands
= GEN
$@
1861 cmd_gen_compile_commands
= $(PYTHON3
) $< -a
$(AR
) -o
$@
$(filter-out $<, $(real-prereqs
))
1863 $(extmod-prefix
)compile_commands.json
: scripts
/clang-tools
/gen_compile_commands.py \
1864 $(if
$(KBUILD_EXTMOD
),,$(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)) \
1865 $(if
$(CONFIG_MODULES
), $(MODORDER
)) FORCE
1866 $(call if_changed
,gen_compile_commands
)
1868 targets
+= $(extmod-prefix
)compile_commands.json
1870 PHONY
+= clang-tidy clang-analyzer
1872 ifdef CONFIG_CC_IS_CLANG
1873 quiet_cmd_clang_tools
= CHECK
$<
1874 cmd_clang_tools
= $(PYTHON3
) $(srctree
)/scripts
/clang-tools
/run-clang-tools.py
$@
$<
1876 clang-tidy clang-analyzer
: $(extmod-prefix
)compile_commands.json
1877 $(call cmd
,clang_tools
)
1879 clang-tidy clang-analyzer
:
1880 @echo
"$@ requires CC=clang" >&2
1884 # Scripts to check various things for consistency
1885 # ---------------------------------------------------------------------------
1887 PHONY
+= includecheck versioncheck coccicheck export_report
1890 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1891 -name
'*.[hcS]' -type f
-print |
sort \
1892 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1895 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1896 -name
'*.[hcS]' -type f
-print |
sort \
1897 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1900 $(Q
)$(BASH
) $(srctree
)/scripts
/$@
1903 $(PERL
) $(srctree
)/scripts
/export_report.pl
1905 PHONY
+= checkstack kernelrelease kernelversion image_name
1907 # UML needs a little special treatment here. It wants to use the host
1908 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1909 # else wants $(ARCH), including people doing cross-builds, which means
1910 # that $(SUBARCH) doesn't work here.
1912 CHECKSTACK_ARCH
:= $(SUBARCH
)
1914 CHECKSTACK_ARCH
:= $(ARCH
)
1917 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1918 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1921 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1924 @echo
$(KERNELVERSION
)
1927 @echo
$(KBUILD_IMAGE
)
1929 # Clear a bunch of variables before executing the submake
1931 ifeq ($(quiet
),silent_
)
1936 $(Q
)mkdir
-p
$(objtree
)/tools
1937 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1940 $(Q
)mkdir
-p
$(objtree
)/tools
1941 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1943 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1944 cmd_rmfiles
= rm -rf
$(rm-files
)
1946 # Run depmod only if we have System.map and depmod is executable
1947 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1948 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1951 # read saved command lines for existing targets
1952 existing-targets
:= $(wildcard $(sort $(targets
)))
1954 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
1956 endif # config-build
1958 endif # need-sub-make
1963 # Declare the contents of the PHONY variable as phony. We keep that
1964 # information in a variable so we can use it in if_changed and friends.