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 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
/compiler-version.h \
483 -include $(srctree
)/include/linux
/kconfig.h
485 # Use LINUXINCLUDE when you must reference the include/ directory.
486 # Needed to be compatible with the O= option
488 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
489 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
490 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
491 -I
$(objtree
)/include \
494 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
495 KBUILD_CFLAGS
:= -Wall
-Wundef
-Werror
=strict-prototypes
-Wno-trigraphs \
496 -fno-strict-aliasing
-fno-common
-fshort-wchar
-fno-PIE \
497 -Werror
=implicit-function-declaration
-Werror
=implicit-int \
498 -Werror
=return-type
-Wno-format-security \
500 KBUILD_CPPFLAGS
:= -D__KERNEL__
501 KBUILD_AFLAGS_KERNEL
:=
502 KBUILD_CFLAGS_KERNEL
:=
503 KBUILD_AFLAGS_MODULE
:= -DMODULE
504 KBUILD_CFLAGS_MODULE
:= -DMODULE
505 KBUILD_LDFLAGS_MODULE
:=
509 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
510 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
511 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
512 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
513 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
515 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
516 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
517 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
518 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
519 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
521 # Files to ignore in find ... statements
523 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
524 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
526 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
527 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
529 # ===========================================================================
530 # Rules shared between *config targets and build targets
532 # Basic helpers built in scripts/basic/
533 PHONY
+= scripts_basic
535 $(Q
)$(MAKE
) $(build
)=scripts
/basic
536 $(Q
)rm -f .tmp_quiet_recordmcount
538 PHONY
+= outputmakefile
539 # Before starting out-of-tree build, make sure the source tree is clean.
540 # outputmakefile generates a Makefile in the output directory, if using a
541 # separate output directory. This allows convenient use of make in the
543 # At the same time when output Makefile generated, generate .gitignore to
544 # ignore whole output directory
546 ifdef building_out_of_srctree
547 $(Q
)if
[ -f
$(srctree
)/.config
-o \
548 -d
$(srctree
)/include/config
-o \
549 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
551 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
552 echo
>&2 "*** in $(abs_srctree)";\
556 $(Q
)ln
-fsn
$(srctree
) source
557 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile
$(srctree
)
558 $(Q
)test -e .gitignore || \
559 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
562 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
563 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
564 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
565 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
566 CC_VERSION_TEXT
= $(shell $(CC
) --version
2>/dev
/null | head
-n
1 | sed
's/\#//g')
568 ifneq ($(findstring clang
,$(CC_VERSION_TEXT
)),)
569 ifneq ($(CROSS_COMPILE
),)
570 CLANG_FLAGS
+= --target
=$(notdir $(CROSS_COMPILE
:%-=%))
571 GCC_TOOLCHAIN_DIR
:= $(dir $(shell which
$(CROSS_COMPILE
)elfedit
))
572 CLANG_FLAGS
+= --prefix=$(GCC_TOOLCHAIN_DIR
)$(notdir $(CROSS_COMPILE
))
573 GCC_TOOLCHAIN
:= $(realpath
$(GCC_TOOLCHAIN_DIR
)/..
)
575 ifneq ($(GCC_TOOLCHAIN
),)
576 CLANG_FLAGS
+= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
578 ifneq ($(LLVM_IAS
),1)
579 CLANG_FLAGS
+= -no-integrated-as
581 CLANG_FLAGS
+= -Werror
=unknown-warning-option
582 KBUILD_CFLAGS
+= $(CLANG_FLAGS
)
583 KBUILD_AFLAGS
+= $(CLANG_FLAGS
)
588 # ===========================================================================
589 # *config targets only - make sure prerequisites are updated, and descend
590 # in scripts/kconfig to make the *config target
592 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
593 # KBUILD_DEFCONFIG may point out an alternative default configuration
594 # used for 'make defconfig'
595 include arch
/$(SRCARCH
)/Makefile
596 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
598 config
: outputmakefile scripts_basic FORCE
599 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
601 %config
: outputmakefile scripts_basic FORCE
602 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
605 # ===========================================================================
606 # Build targets only - this includes vmlinux, arch specific targets, clean
607 # targets and others. In general all targets except *config targets.
609 # If building an external module we do not care about the all: rule
610 # but instead __all depend on modules
612 ifeq ($(KBUILD_EXTMOD
),)
618 # Decide whether to build built-in, modular, or both.
619 # Normally, just do built-in.
624 # If we have only "make modules", don't compile built-in objects.
625 ifeq ($(MAKECMDGOALS
),modules
)
629 # If we have "make <whatever> modules", compile modules
630 # in addition to whatever we do anyway.
631 # Just "make" or "make all" shall build modules as well
633 ifneq ($(filter all modules nsdeps
%compile_commands.json clang-
%,$(MAKECMDGOALS
)),)
637 ifeq ($(MAKECMDGOALS
),)
641 export KBUILD_MODULES KBUILD_BUILTIN
644 include include/config
/auto.conf
647 ifeq ($(KBUILD_EXTMOD
),)
648 # Objects we will link into vmlinux / subdirs we need to visit
650 drivers-y
:= drivers
/ sound
/
651 drivers-
$(CONFIG_SAMPLES
) += samples
/
652 drivers-
$(CONFIG_NET
) += net
/
655 endif # KBUILD_EXTMOD
657 # The all: target is the default when no target is given on the
659 # This allow a user to issue only 'make' to build a kernel including modules
660 # Defaults to vmlinux, but the arch makefile usually adds further targets
663 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage \
664 $(call cc-option
,-fno-tree-loop-im
) \
665 $(call cc-disable-warning
,maybe-uninitialized
,)
668 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
669 ifdef CONFIG_FUNCTION_TRACER
670 CC_FLAGS_FTRACE
:= -pg
673 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
674 RETPOLINE_VDSO_CFLAGS_GCC
:= -mindirect-branch
=thunk-inline
-mindirect-branch-register
675 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
676 RETPOLINE_VDSO_CFLAGS_CLANG
:= -mretpoline
677 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
678 RETPOLINE_VDSO_CFLAGS
:= $(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_CLANG
)))
679 export RETPOLINE_CFLAGS
680 export RETPOLINE_VDSO_CFLAGS
682 include arch
/$(SRCARCH
)/Makefile
685 ifdef may-sync-config
686 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
687 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
688 # because some architectures define CROSS_COMPILE there.
689 include include/config
/auto.conf.cmd
693 @echo
>&2 '*** Configuration file "$@" not found!'
695 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
696 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
700 # The actual configuration files used during the build are stored in
701 # include/generated/ and include/config/. Update them if .config is newer than
702 # include/config/auto.conf (which mirrors .config).
704 # This exploits the 'multi-target pattern rule' trick.
705 # The syncconfig should be executed only once to make all the targets.
706 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
707 quiet_cmd_syncconfig
= SYNC
$@
708 cmd_syncconfig
= $(MAKE
) -f
$(srctree
)/Makefile syncconfig
710 %/config
/auto.conf
%/config
/auto.conf.cmd
%/generated
/autoconf.h
: $(KCONFIG_CONFIG
)
711 +$(call cmd
,syncconfig
)
712 else # !may-sync-config
713 # External modules and some install targets need include/generated/autoconf.h
714 # and include/config/auto.conf but do not care if they are up-to-date.
715 # Use auto.conf to trigger the test
716 PHONY
+= include/config
/auto.conf
718 include/config
/auto.conf
:
719 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
721 echo
>&2 " ERROR: Kernel configuration is invalid."; \
722 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
723 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
727 endif # may-sync-config
730 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
731 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
732 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
733 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
734 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
736 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
738 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
740 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
744 # Tell gcc to never replace conditional load with a non-conditional one
745 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
746 KBUILD_CFLAGS
+= $(call cc-option
,-fno-allow-store-data-races
)
748 ifdef CONFIG_READABLE_ASM
749 # Disable optimizations that make assembler listings hard to read.
750 # reorder blocks reorders the control in the function
751 # ipa clone creates specialized cloned functions
752 # partial inlining inlines only parts of functions
753 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
754 $(call cc-option
,-fno-ipa-cp-clone
,) \
755 $(call cc-option
,-fno-partial-inlining
)
758 ifneq ($(CONFIG_FRAME_WARN
),0)
759 KBUILD_CFLAGS
+= -Wframe-larger-than
=$(CONFIG_FRAME_WARN
)
762 stackp-flags-y
:= -fno-stack-protector
763 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
764 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
766 KBUILD_CFLAGS
+= $(stackp-flags-y
)
768 ifdef CONFIG_CC_IS_CLANG
769 KBUILD_CPPFLAGS
+= -Qunused-arguments
770 KBUILD_CFLAGS
+= -Wno-format-invalid-specifier
771 KBUILD_CFLAGS
+= -Wno-gnu
772 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
773 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
774 # See modpost pattern 2
775 KBUILD_CFLAGS
+= -mno-global-merge
778 # These warnings generated too much noise in a regular build.
779 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
780 KBUILD_CFLAGS
+= -Wno-unused-but-set-variable
782 # Warn about unmarked fall-throughs in switch statement.
783 # Disabled for clang while comment to attribute conversion happens and
784 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
785 KBUILD_CFLAGS
+= $(call cc-option
,-Wimplicit-fallthrough
,)
788 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
789 ifdef CONFIG_FRAME_POINTER
790 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
792 # Some targets (ARM with Thumb2, for example), can't be built with frame
793 # pointers. For those, we don't have FUNCTION_TRACER automatically
794 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
795 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
796 # -fomit-frame-pointer with FUNCTION_TRACER.
797 ifndef CONFIG_FUNCTION_TRACER
798 KBUILD_CFLAGS
+= -fomit-frame-pointer
802 # Initialize all stack variables with a 0xAA pattern.
803 ifdef CONFIG_INIT_STACK_ALL_PATTERN
804 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
807 # Initialize all stack variables with a zero value.
808 ifdef CONFIG_INIT_STACK_ALL_ZERO
809 # Future support for zero initialization is still being debated, see
810 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
811 # renamed or dropped.
812 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=zero
813 KBUILD_CFLAGS
+= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
818 # Workaround for GCC versions < 5.0
819 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
820 ifdef CONFIG_CC_IS_GCC
821 DEBUG_CFLAGS
+= $(call cc-ifversion
, -lt
, 0500, $(call cc-option
, -fno-var-tracking-assignments
))
824 ifdef CONFIG_DEBUG_INFO
826 ifdef CONFIG_DEBUG_INFO_SPLIT
827 DEBUG_CFLAGS
+= -gsplit-dwarf
832 ifneq ($(LLVM_IAS
),1)
833 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
836 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
837 dwarf-version-
$(CONFIG_DEBUG_INFO_DWARF4
) := 4
838 dwarf-version-
$(CONFIG_DEBUG_INFO_DWARF5
) := 5
839 DEBUG_CFLAGS
+= -gdwarf-
$(dwarf-version-y
)
842 ifdef CONFIG_DEBUG_INFO_REDUCED
843 DEBUG_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
844 $(call cc-option
,-fno-var-tracking
)
847 ifdef CONFIG_DEBUG_INFO_COMPRESSED
848 DEBUG_CFLAGS
+= -gz
=zlib
849 KBUILD_AFLAGS
+= -gz
=zlib
850 KBUILD_LDFLAGS
+= --compress-debug-sections
=zlib
853 endif # CONFIG_DEBUG_INFO
855 KBUILD_CFLAGS
+= $(DEBUG_CFLAGS
)
858 ifdef CONFIG_FUNCTION_TRACER
859 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
860 CC_FLAGS_FTRACE
+= -mrecord-mcount
861 ifdef CONFIG_HAVE_NOP_MCOUNT
862 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
863 CC_FLAGS_FTRACE
+= -mnop-mcount
864 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
868 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
869 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
871 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
872 ifdef CONFIG_HAVE_C_RECORDMCOUNT
873 BUILD_C_RECORDMCOUNT
:= y
874 export BUILD_C_RECORDMCOUNT
877 ifdef CONFIG_HAVE_FENTRY
878 ifeq ($(call cc-option-yn
, -mfentry
),y
)
879 CC_FLAGS_FTRACE
+= -mfentry
880 CC_FLAGS_USING
+= -DCC_USING_FENTRY
883 export CC_FLAGS_FTRACE
884 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
885 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
888 # We trigger additional mismatches with less inlining
889 ifdef CONFIG_DEBUG_SECTION_MISMATCH
890 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
893 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
894 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
895 LDFLAGS_vmlinux
+= --gc-sections
898 ifdef CONFIG_SHADOW_CALL_STACK
899 CC_FLAGS_SCS
:= -fsanitize
=shadow-call-stack
900 KBUILD_CFLAGS
+= $(CC_FLAGS_SCS
)
904 ifdef CONFIG_LTO_CLANG
905 ifdef CONFIG_LTO_CLANG_THIN
906 CC_FLAGS_LTO
:= -flto
=thin
-fsplit-lto-unit
907 KBUILD_LDFLAGS
+= --thinlto-cache-dir
=$(extmod-prefix
).thinlto-cache
909 CC_FLAGS_LTO
:= -flto
911 CC_FLAGS_LTO
+= -fvisibility
=hidden
913 # Limit inlining across translation units to reduce binary size
914 KBUILD_LDFLAGS
+= -mllvm
-import-instr-limit
=5
918 KBUILD_CFLAGS
+= -fno-lto
$(CC_FLAGS_LTO
)
919 KBUILD_AFLAGS
+= -fno-lto
923 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
924 KBUILD_CFLAGS
+= -falign-functions
=32
927 # arch Makefile may override CC so keep this after arch Makefile is included
928 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
930 # warn about C99 declaration after statement
931 KBUILD_CFLAGS
+= -Wdeclaration-after-statement
933 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
934 KBUILD_CFLAGS
+= -Wvla
936 # disable pointer signed / unsigned warnings in gcc 4.0
937 KBUILD_CFLAGS
+= -Wno-pointer-sign
939 # disable stringop warnings in gcc 8+
940 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
942 # We'll want to enable this eventually, but it's not going away for 5.7 at least
943 KBUILD_CFLAGS
+= $(call cc-disable-warning
, zero-length-bounds
)
944 KBUILD_CFLAGS
+= $(call cc-disable-warning
, array-bounds
)
945 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-overflow
)
947 # Another good warning that we'll want to enable eventually
948 KBUILD_CFLAGS
+= $(call cc-disable-warning
, restrict
)
950 # Enabled with W=2, disabled by default as noisy
951 KBUILD_CFLAGS
+= $(call cc-disable-warning
, maybe-uninitialized
)
953 # disable invalid "can't wrap" optimizations for signed / pointers
954 KBUILD_CFLAGS
+= -fno-strict-overflow
956 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
957 KBUILD_CFLAGS
+= -fno-stack-check
959 # conserve stack if available
960 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
962 # Prohibit date/time macros, which would make the build non-deterministic
963 KBUILD_CFLAGS
+= -Werror
=date-time
965 # enforce correct pointer usage
966 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
968 # Require designated initializers for all marked structures
969 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
971 # change __FILE__ to the relative path from the srctree
972 KBUILD_CPPFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
974 # include additional Makefiles when needed
975 include-y
:= scripts
/Makefile.extrawarn
976 include-
$(CONFIG_KASAN
) += scripts
/Makefile.kasan
977 include-
$(CONFIG_KCSAN
) += scripts
/Makefile.kcsan
978 include-
$(CONFIG_UBSAN
) += scripts
/Makefile.ubsan
979 include-
$(CONFIG_KCOV
) += scripts
/Makefile.kcov
980 include-
$(CONFIG_GCC_PLUGINS
) += scripts
/Makefile.gcc-plugins
982 include $(addprefix $(srctree
)/, $(include-y
))
984 # scripts/Makefile.gcc-plugins is intentionally included last.
985 # Do not add $(call cc-option,...) below this line. When you build the kernel
986 # from the clean source tree, the GCC plugins do not exist at this point.
988 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
989 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
990 KBUILD_AFLAGS
+= $(KAFLAGS
)
991 KBUILD_CFLAGS
+= $(KCFLAGS
)
993 KBUILD_LDFLAGS_MODULE
+= --build-id
=sha1
994 LDFLAGS_vmlinux
+= --build-id
=sha1
996 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
997 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
1000 ifeq ($(CONFIG_RELR
),y
)
1001 LDFLAGS_vmlinux
+= --pack-dyn-relocs
=relr
1004 # We never want expected sections to be placed heuristically by the
1005 # linker. All sections should be explicitly named in the linker script.
1006 ifdef CONFIG_LD_ORPHAN_WARN
1007 LDFLAGS_vmlinux
+= --orphan-handling
=warn
1010 # Align the bit size of userspace programs with the kernel
1011 KBUILD_USERCFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1012 KBUILD_USERLDFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1014 # make the checker run with the right architecture
1015 CHECKFLAGS
+= --arch
=$(ARCH
)
1017 # insure the checker run with the right endianness
1018 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
1020 # the checker needs the correct machine size
1021 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
1023 # Default kernel image to build when no specific target is given.
1024 # KBUILD_IMAGE may be overruled on the command line or
1025 # set in the environment
1026 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1027 # this default value
1028 export KBUILD_IMAGE ?
= vmlinux
1031 # INSTALL_PATH specifies where to place the updated kernel and system map
1032 # images. Default is /boot, but you can set it to other values
1033 export INSTALL_PATH ?
= /boot
1036 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1037 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1038 # an argument if needed. Otherwise it defaults to the kernel install path
1040 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
1043 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1044 # relocations required by build roots. This is not defined in the
1045 # makefile but the argument can be passed to make if needed.
1048 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
1052 # INSTALL_MOD_STRIP, if defined, will cause modules to be
1053 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1054 # the default option --strip-debug will be used. Otherwise,
1055 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1057 ifdef INSTALL_MOD_STRIP
1058 ifeq ($(INSTALL_MOD_STRIP
),1)
1059 mod_strip_cmd
= $(STRIP
) --strip-debug
1061 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
1062 endif # INSTALL_MOD_STRIP=1
1064 mod_strip_cmd
= true
1065 endif # INSTALL_MOD_STRIP
1066 export mod_strip_cmd
1068 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1069 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1070 # or CONFIG_MODULE_COMPRESS_XZ.
1072 mod_compress_cmd
= true
1073 ifdef CONFIG_MODULE_COMPRESS
1074 ifdef CONFIG_MODULE_COMPRESS_GZIP
1075 mod_compress_cmd
= $(KGZIP
) -n
-f
1076 endif # CONFIG_MODULE_COMPRESS_GZIP
1077 ifdef CONFIG_MODULE_COMPRESS_XZ
1078 mod_compress_cmd
= $(XZ
) --lzma2
=dict
=2MiB
-f
1079 endif # CONFIG_MODULE_COMPRESS_XZ
1080 endif # CONFIG_MODULE_COMPRESS
1081 export mod_compress_cmd
1083 ifdef CONFIG_MODULE_SIG_ALL
1084 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
1086 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
1092 HOST_LIBELF_LIBS
= $(shell pkg-config libelf
--libs
2>/dev
/null || echo
-lelf
)
1094 has_libelf
= $(call try-run
,\
1095 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
$(HOST_LIBELF_LIBS
) -,1,0)
1097 ifdef CONFIG_STACK_VALIDATION
1098 ifeq ($(has_libelf
),1)
1099 objtool_target
:= tools
/objtool FORCE
1101 SKIP_STACK_VALIDATION
:= 1
1102 export SKIP_STACK_VALIDATION
1106 PHONY
+= resolve_btfids_clean
1108 resolve_btfids_O
= $(abspath
$(objtree
))/tools
/bpf
/resolve_btfids
1110 # tools/bpf/resolve_btfids directory might not exist
1111 # in output directory, skip its clean in that case
1112 resolve_btfids_clean
:
1113 ifneq ($(wildcard $(resolve_btfids_O
)),)
1114 $(Q
)$(MAKE
) -sC
$(srctree
)/tools
/bpf
/resolve_btfids O
=$(resolve_btfids_O
) clean
1118 ifdef CONFIG_DEBUG_INFO_BTF
1119 ifeq ($(has_libelf
),1)
1120 resolve_btfids_target
:= tools
/bpf
/resolve_btfids FORCE
1122 ERROR_RESOLVE_BTFIDS
:= 1
1124 endif # CONFIG_DEBUG_INFO_BTF
1129 extmod-prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
1130 export MODORDER
:= $(extmod-prefix
)modules.order
1131 export MODULES_NSDEPS
:= $(extmod-prefix
)modules.nsdeps
1133 ifeq ($(KBUILD_EXTMOD
),)
1134 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
1136 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, \
1137 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
1138 $(libs-y
) $(libs-m
)))
1140 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) Documentation \
1141 $(patsubst %/,%,$(filter %/, $(core-
) \
1142 $(drivers-
) $(libs-
))))
1144 subdir-modorder
:= $(addsuffix modules.order
,$(filter %/, \
1145 $(core-y
) $(core-m
) $(libs-y
) $(libs-m
) \
1146 $(drivers-y
) $(drivers-m
)))
1148 build-dirs
:= $(vmlinux-dirs
)
1149 clean-dirs
:= $(vmlinux-alldirs
)
1151 # Externally visible symbols (used by link-vmlinux.sh)
1152 KBUILD_VMLINUX_OBJS
:= $(head-y
) $(patsubst %/,%/built-in.a
, $(core-y
))
1153 KBUILD_VMLINUX_OBJS
+= $(addsuffix built-in.a
, $(filter %/, $(libs-y
)))
1154 ifdef CONFIG_MODULES
1155 KBUILD_VMLINUX_OBJS
+= $(patsubst %/, %/lib.a
, $(filter %/, $(libs-y
)))
1156 KBUILD_VMLINUX_LIBS
:= $(filter-out %/, $(libs-y
))
1158 KBUILD_VMLINUX_LIBS
:= $(patsubst %/,%/lib.a
, $(libs-y
))
1160 KBUILD_VMLINUX_OBJS
+= $(patsubst %/,%/built-in.a
, $(drivers-y
))
1162 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1163 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1164 # used by scripts/Makefile.package
1165 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) LICENSES arch
include scripts tools
)
1167 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)
1169 # Recurse until adjust_autoksyms.sh is satisfied
1170 PHONY
+= autoksyms_recursive
1171 ifdef CONFIG_TRIM_UNUSED_KSYMS
1172 # For the kernel to actually contain only the needed exported symbols,
1173 # we have to build modules as well to determine what those symbols are.
1174 # (this can be evaluated only once include/config/auto.conf has been included)
1177 autoksyms_recursive
: descend modules.order
1178 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1179 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1182 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1184 quiet_cmd_autoksyms_h
= GEN
$@
1185 cmd_autoksyms_h
= mkdir
-p
$(dir $@
); \
1186 $(CONFIG_SHELL
) $(srctree
)/scripts
/gen_autoksyms.sh
$@
1189 $(call cmd
,autoksyms_h
)
1191 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1193 # Final link of vmlinux with optional arch pass after final link
1194 cmd_link-vmlinux
= \
1195 $(CONFIG_SHELL
) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1196 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1198 vmlinux
: scripts
/link-vmlinux.sh autoksyms_recursive
$(vmlinux-deps
) FORCE
1199 +$(call if_changed
,link-vmlinux
)
1203 # The actual objects are generated when descending,
1204 # make sure no implicit rule kicks in
1205 $(sort $(vmlinux-deps
) $(subdir-modorder
)): descend
;
1207 filechk_kernel.release
= \
1208 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1210 # Store (new) KERNELRELEASE string in include/config/kernel.release
1211 include/config
/kernel.release
: FORCE
1212 $(call filechk
,kernel.release
)
1214 # Additional helpers built in scripts/
1215 # Carefully list dependencies so we do not try to build scripts twice
1218 scripts
: scripts_basic scripts_dtc
1219 $(Q
)$(MAKE
) $(build
)=$(@
)
1221 # Things we need to do before we recursively start building the kernel
1222 # or the modules are listed in "prepare".
1223 # A multi level approach is used. prepareN is processed before prepareN-1.
1224 # archprepare is used in arch Makefiles and when processed asm symlink,
1225 # version.h and scripts_basic is processed / created.
1227 PHONY
+= prepare archprepare
1229 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1230 asm-generic
$(version_h
) $(autoksyms_h
) include/generated
/utsrelease.h \
1231 include/generated
/autoconf.h
1233 prepare0
: archprepare
1234 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1235 $(Q
)$(MAKE
) $(build
)=.
1237 # All the preparing..
1238 prepare
: prepare0 prepare-objtool prepare-resolve_btfids
1240 # Support for using generic headers in asm-generic
1241 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1243 PHONY
+= asm-generic uapi-asm-generic
1244 asm-generic
: uapi-asm-generic
1245 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1246 generic
=include/asm-generic
1248 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1249 generic
=include/uapi
/asm-generic
1251 PHONY
+= prepare-objtool prepare-resolve_btfids
1252 prepare-objtool
: $(objtool_target
)
1253 ifeq ($(SKIP_STACK_VALIDATION
),1)
1254 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
1255 @echo
"error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1258 ifdef CONFIG_UNWINDER_ORC
1259 @echo
"error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1262 @echo
"warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1266 prepare-resolve_btfids
: $(resolve_btfids_target
)
1267 ifeq ($(ERROR_RESOLVE_BTFIDS
),1)
1268 @echo
"error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1271 # Generate some files
1272 # ---------------------------------------------------------------------------
1274 # KERNELRELEASE can change from a few different places, meaning version.h
1275 # needs to be updated, so this check is forced on all builds
1278 define filechk_utsrelease.h
1279 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1280 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1283 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1286 define filechk_version.h
1287 if
[ $(SUBLEVEL
) -gt
255 ]; then \
1288 echo \
#define LINUX_VERSION_CODE $(shell \
1289 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + 255); \
1291 echo \
#define LINUX_VERSION_CODE $(shell \
1292 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
1294 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1295 ((c) > 255 ? 255 : (c)))'; \
1296 echo \
#define LINUX_VERSION_MAJOR $(VERSION); \
1297 echo \
#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1298 echo \
#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1301 $(version_h
): PATCHLEVEL
:= $(if
$(PATCHLEVEL
), $(PATCHLEVEL
), 0)
1302 $(version_h
): SUBLEVEL
:= $(if
$(SUBLEVEL
), $(SUBLEVEL
), 0)
1304 $(call filechk
,version.h
)
1306 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1307 $(call filechk
,utsrelease.h
)
1311 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1312 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1314 # ---------------------------------------------------------------------------
1317 #Default location for installed headers
1318 export INSTALL_HDR_PATH
= $(objtree
)/usr
1320 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1321 cmd_headers_install
= \
1322 mkdir
-p
$(INSTALL_HDR_PATH
); \
1323 rsync
-mrl
--include='*/' --include='*\.h' --exclude
='*' \
1324 usr
/include $(INSTALL_HDR_PATH
)
1326 PHONY
+= headers_install
1327 headers_install
: headers
1328 $(call cmd
,headers_install
)
1330 PHONY
+= archheaders archscripts
1332 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1335 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1336 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1337 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1338 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1339 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1341 # Deprecated. It is no-op now.
1342 PHONY
+= headers_check
1346 ifdef CONFIG_HEADERS_INSTALL
1350 PHONY
+= scripts_unifdef
1351 scripts_unifdef
: scripts_basic
1352 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1354 # ---------------------------------------------------------------------------
1359 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1362 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1364 PHONY
+= kselftest-merge
1366 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1367 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config | \
1368 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-m
$(objtree
)/.config
1369 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1371 # ---------------------------------------------------------------------------
1374 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1375 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1380 %.dtb
: include/config
/kernel.release scripts_dtc
1381 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1383 %.dtbo
: include/config
/kernel.release scripts_dtc
1384 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1386 PHONY
+= dtbs dtbs_install dtbs_check
1387 dtbs
: include/config
/kernel.release scripts_dtc
1388 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1390 ifneq ($(filter dtbs_check
, $(MAKECMDGOALS
)),)
1392 dtbs
: dt_binding_check
1398 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
) dst
=$(INSTALL_DTBS_PATH
)
1400 ifdef CONFIG_OF_EARLY_FLATTREE
1406 PHONY
+= scripts_dtc
1407 scripts_dtc
: scripts_basic
1408 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1410 ifneq ($(filter dt_binding_check
, $(MAKECMDGOALS
)),)
1411 export CHECK_DT_BINDING
=y
1414 PHONY
+= dt_binding_check
1415 dt_binding_check
: scripts_dtc
1416 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1418 # ---------------------------------------------------------------------------
1421 ifdef CONFIG_MODULES
1423 # By default, build modules as well
1427 # When we're building modules with modversions, we need to consider
1428 # the built-in objects during the descend as well, in order to
1429 # make sure the checksums are up to date before we record them.
1430 ifdef CONFIG_MODVERSIONS
1436 # A module can be listed more than once in obj-m resulting in
1437 # duplicate lines in modules.order files. Those are removed
1438 # using awk while concatenating to the final file.
1441 modules
: $(if
$(KBUILD_BUILTIN
),vmlinux
) modules_check modules_prepare
1442 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1444 PHONY
+= modules_check
1445 modules_check
: modules.order
1446 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
$<
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 # Target to install modules
1461 PHONY
+= modules_install
1462 modules_install
: _modinst_ _modinst_post
1466 @
rm -rf
$(MODLIB
)/kernel
1467 @
rm -f
$(MODLIB
)/source
1468 @mkdir
-p
$(MODLIB
)/kernel
1469 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1470 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1471 rm -f
$(MODLIB
)/build
; \
1472 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1474 @sed
's:^:kernel/:' modules.order
> $(MODLIB
)/modules.order
1475 @cp
-f modules.builtin
$(MODLIB
)/
1476 @cp
-f
$(objtree
)/modules.builtin.modinfo
$(MODLIB
)/
1477 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1479 # This depmod is only for convenience to give the initial
1480 # boot a modules.dep even before / is mounted read-write. However the
1481 # boot script depmod is the master version.
1482 PHONY
+= _modinst_post
1483 _modinst_post
: _modinst_
1486 ifeq ($(CONFIG_MODULE_SIG
), y
)
1487 PHONY
+= modules_sign
1489 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1492 else # CONFIG_MODULES
1494 # Modules not configured
1495 # ---------------------------------------------------------------------------
1497 PHONY
+= modules modules_install
1498 modules modules_install
:
1500 @echo
>&2 "The present kernel configuration has modules disabled."
1501 @echo
>&2 "Type 'make config' and enable loadable module support."
1502 @echo
>&2 "Then build a kernel with module support enabled."
1506 endif # CONFIG_MODULES
1509 # Cleaning is done on three levels.
1510 # make clean Delete most generated files
1511 # Leave enough to build external modules
1512 # make mrproper Delete the current configuration, and all generated files
1513 # make distclean Remove editor backup files, patch leftover files and the like
1515 # Directories & files removed with 'make clean'
1516 CLEAN_FILES
+= include/ksym vmlinux.symvers \
1517 modules.builtin modules.builtin.modinfo modules.nsdeps \
1518 compile_commands.json .thinlto-cache
1520 # Directories & files removed with 'make mrproper'
1521 MRPROPER_FILES
+= include/config
include/generated \
1522 arch
/$(SRCARCH
)/include/generated .tmp_objdiff \
1523 debian snap tar-install \
1524 .config .config.old .version \
1526 signing_key.pem signing_key.priv signing_key.x509 \
1527 x509.genkey extra_certificates signing_key.x509.keyid \
1528 signing_key.x509.signer vmlinux-gdb.py \
1531 # Directories & files removed with 'make distclean'
1532 DISTCLEAN_FILES
+= tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS
1534 # clean - Delete most, but leave enough to build external modules
1536 clean: rm-files
:= $(CLEAN_FILES
)
1538 PHONY
+= archclean vmlinuxclean
1541 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1542 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1544 clean: archclean vmlinuxclean resolve_btfids_clean
1546 # mrproper - Delete all generated files, including .config
1548 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1549 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1551 PHONY
+= $(mrproper-dirs
) mrproper
1553 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1555 mrproper
: clean $(mrproper-dirs
)
1560 distclean: rm-files
:= $(wildcard $(DISTCLEAN_FILES
))
1566 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1567 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1568 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1569 -o
-name
'core' \
) \
1570 -type f
-print | xargs
rm -f
1573 # Packaging of the kernel to various formats
1574 # ---------------------------------------------------------------------------
1577 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1578 %pkg
: include/config
/kernel.release FORCE
1579 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1581 # Brief documentation of the typical targets used
1582 # ---------------------------------------------------------------------------
1584 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1585 boards
:= $(sort $(notdir $(boards
)))
1586 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1587 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1591 @echo
'Cleaning targets:'
1592 @echo
' clean - Remove most generated files but keep the config and'
1593 @echo
' enough build support to build external modules'
1594 @echo
' mrproper - Remove all generated files + config + various backup files'
1595 @echo
' distclean - mrproper + remove editor backup and patch files'
1597 @echo
'Configuration targets:'
1598 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1600 @echo
'Other generic targets:'
1601 @echo
' all - Build all targets marked with [*]'
1602 @echo
'* vmlinux - Build the bare kernel'
1603 @echo
'* modules - Build all modules'
1604 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1605 @echo
' dir/ - Build all files in dir and below'
1606 @echo
' dir/file.[ois] - Build specified target only'
1607 @echo
' dir/file.ll - Build the LLVM assembly file'
1608 @echo
' (requires compiler support for LLVM assembly generation)'
1609 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1610 @echo
' (requires a recent binutils and recent build (System.map))'
1611 @echo
' dir/file.ko - Build module including final link'
1612 @echo
' modules_prepare - Set up for building external modules'
1613 @echo
' tags/TAGS - Generate tags file for editors'
1614 @echo
' cscope - Generate cscope index'
1615 @echo
' gtags - Generate GNU GLOBAL index'
1616 @echo
' kernelrelease - Output the release version string (use with make -s)'
1617 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1618 @echo
' image_name - Output the image name (use with make -s)'
1619 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1620 echo
' (default: $(INSTALL_HDR_PATH))'; \
1622 @echo
'Static analysers:'
1623 @echo
' checkstack - Generate a list of stack hogs'
1624 @echo
' versioncheck - Sanity check on version.h usage'
1625 @echo
' includecheck - Check for duplicate included header files'
1626 @echo
' export_report - List the usages of all exported symbols'
1627 @echo
' headerdep - Detect inclusion cycles in headers'
1628 @echo
' coccicheck - Check with Coccinelle'
1629 @echo
' clang-analyzer - Check with clang static analyzer'
1630 @echo
' clang-tidy - Check with clang-tidy'
1633 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1635 @echo
'Kernel selftest:'
1636 @echo
' kselftest - Build and run kernel selftest'
1637 @echo
' Build, install, and boot kernel before'
1638 @echo
' running kselftest on it'
1639 @echo
' Run as root for full coverage'
1640 @echo
' kselftest-all - Build kernel selftest'
1641 @echo
' kselftest-install - Build and install kernel selftest'
1642 @echo
' kselftest-clean - Remove all generated kselftest files'
1643 @echo
' kselftest-merge - Merge all the config dependencies of'
1644 @echo
' kselftest to existing .config.'
1647 echo
'Devicetree:'; \
1648 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1649 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1650 echo
' dt_binding_check - Validate device tree binding documents'; \
1651 echo
' dtbs_check - Validate device tree source files';\
1654 @echo
'Userspace tools targets:'
1655 @echo
' use "make tools/help"'
1656 @echo
' or "cd tools; make help"'
1658 @echo
'Kernel packaging:'
1659 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1661 @echo
'Documentation targets:'
1662 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1664 @echo
'Architecture specific targets ($(SRCARCH)):'
1665 @
$(if
$(archhelp
),$(archhelp
),\
1666 echo
' No architecture specific help defined for $(SRCARCH)')
1669 $(foreach b
, $(boards
), \
1670 printf
" %-27s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1672 @
$(if
$(board-dirs
), \
1673 $(foreach b
, $(board-dirs
), \
1674 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1675 printf
" %-16s - Show all of the above\\n" help-boards
; \
1678 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1679 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1680 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1681 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK'
1682 @echo
' (sparse by default)'
1683 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1684 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1685 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1686 @echo
' 1: warnings which may be relevant and do not occur too often'
1687 @echo
' 2: warnings which occur quite often but may still be relevant'
1688 @echo
' 3: more obscure warnings, can most likely be ignored'
1689 @echo
' Multiple levels can be combined with W=12 or W=123'
1691 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1692 @echo
'For further info see the ./README file'
1695 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1697 help-boards
: $(help-board-dirs
)
1699 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1701 $(help-board-dirs
): help-
%:
1702 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1703 @
$(if
$(boards-per-dir
), \
1704 $(foreach b
, $(boards-per-dir
), \
1705 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1709 # Documentation targets
1710 # ---------------------------------------------------------------------------
1711 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1712 linkcheckdocs dochelp refcheckdocs
1713 PHONY
+= $(DOC_TARGETS
)
1715 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1718 # ---------------------------------------------------------------------------
1720 PHONY
+= scripts_gdb
1721 scripts_gdb
: prepare0
1722 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1723 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1725 ifdef CONFIG_GDB_SCRIPTS
1729 else # KBUILD_EXTMOD
1732 # External module support.
1733 # When building external modules the kernel used as basis is considered
1734 # read-only, and no consistency checks are made and the make
1735 # system is not used on the basis kernel. If updates are required
1736 # in the basis kernel ordinary make commands (without M=...) must
1739 # The following are the only valid targets when building external
1741 # make M=dir clean Delete all automatically generated files
1742 # make M=dir modules Make all modules in specified dir
1743 # make M=dir Same as 'make M=dir modules'
1744 # make M=dir modules_install
1745 # Install the modules built in the module directory
1746 # Assumes install directory is already created
1748 # We are always building only modules.
1752 build-dirs
:= $(KBUILD_EXTMOD
)
1754 modules
: $(MODORDER
)
1755 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1757 $(MODORDER
): descend
1760 PHONY
+= modules_install
1761 modules_install
: _emodinst_ _emodinst_post
1763 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1766 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1767 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1769 PHONY
+= _emodinst_post
1770 _emodinst_post
: _emodinst_
1773 compile_commands.json
: $(extmod-prefix
)compile_commands.json
1774 PHONY
+= compile_commands.json
1776 clean-dirs
:= $(KBUILD_EXTMOD
)
1777 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
$(KBUILD_EXTMOD
)/modules.nsdeps \
1778 $(KBUILD_EXTMOD
)/compile_commands.json
$(KBUILD_EXTMOD
)/.thinlto-cache
1782 @echo
' Building external modules.'
1783 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1785 @echo
' modules - default target, build the module(s)'
1786 @echo
' modules_install - install the module'
1787 @echo
' clean - remove generated files in module directory only'
1790 # no-op for external module builds
1791 PHONY
+= prepare modules_prepare
1793 endif # KBUILD_EXTMOD
1796 # ---------------------------------------------------------------------------
1797 # To build individual files in subdirectories, you can do like this:
1799 # make foo/bar/baz.s
1801 # The supported suffixes for single-target are listed in 'single-targets'
1803 # To build only under specific subdirectories, you can do like this:
1809 # .ko is special because modpost is needed
1810 single-ko
:= $(sort $(filter %.ko
, $(MAKECMDGOALS
)))
1811 single-no-ko
:= $(sort $(patsubst %.ko
,%.mod
, $(MAKECMDGOALS
)))
1813 $(single-ko
): single_modpost
1815 $(single-no-ko
): descend
1818 ifeq ($(KBUILD_EXTMOD
),)
1819 # For the single build of in-tree modules, use a temporary file to avoid
1820 # the situation of modules_install installing an invalid modules.order.
1821 MODORDER
:= .modules.tmp
1824 PHONY
+= single_modpost
1825 single_modpost
: $(single-no-ko
) modules_prepare
1826 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod-prefix
)$m;) } > $(MODORDER
)
1827 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1831 export KBUILD_SINGLE_TARGETS
:= $(addprefix $(extmod-prefix
), $(single-no-ko
))
1833 # trim unrelated directories
1834 build-dirs
:= $(foreach d
, $(build-dirs
), \
1835 $(if
$(filter $(d
)/%, $(KBUILD_SINGLE_TARGETS
)), $(d
)))
1839 ifndef CONFIG_MODULES
1843 # Handle descending into subdirectories listed in $(build-dirs)
1844 # Preset locale variables to speed up the build process. Limit locale
1845 # tweaks to this spot to avoid wrong language settings when running
1846 # make menuconfig etc.
1847 # Error messages still appears in the original language
1848 PHONY
+= descend
$(build-dirs
)
1849 descend
: $(build-dirs
)
1850 $(build-dirs
): prepare
1851 $(Q
)$(MAKE
) $(build
)=$@ \
1852 single-build
=$(if
$(filter-out $@
/, $(filter $@
/%, $(KBUILD_SINGLE_TARGETS
))),1) \
1853 need-builtin
=1 need-modorder
=1
1855 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
1856 PHONY
+= $(clean-dirs
) clean
1858 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1860 clean: $(clean-dirs
)
1862 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1863 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1865 -o
-name
'*.dtb' -o
-name
'*.dtbo' -o
-name
'*.dtb.S' -o
-name
'*.dt.yaml' \
1866 -o
-name
'*.dwo' -o
-name
'*.lst' \
1867 -o
-name
'*.su' -o
-name
'*.mod' \
1868 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1869 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1870 -o
-name
'*.asn1.[ch]' \
1871 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1872 -o
-name
'.tmp_*.o.*' \
1873 -o
-name
'*.c.[012]*.*' \
1876 -o
-name
'*.*.symversions' \
) -type f
-print | xargs
rm -f
1878 # Generate tags for editors
1879 # ---------------------------------------------------------------------------
1880 quiet_cmd_tags
= GEN
$@
1881 cmd_tags
= $(BASH
) $(srctree
)/scripts
/tags.sh
$@
1883 tags TAGS cscope gtags
: FORCE
1886 # Script to generate missing namespace dependencies
1887 # ---------------------------------------------------------------------------
1890 nsdeps
: export KBUILD_NSDEPS
=1
1892 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/nsdeps
1895 # ---------------------------------------------------------------------------
1897 quiet_cmd_gen_compile_commands
= GEN
$@
1898 cmd_gen_compile_commands
= $(PYTHON3
) $< -a
$(AR
) -o
$@
$(filter-out $<, $(real-prereqs
))
1900 $(extmod-prefix
)compile_commands.json
: scripts
/clang-tools
/gen_compile_commands.py \
1901 $(if
$(KBUILD_EXTMOD
),,$(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)) \
1902 $(if
$(CONFIG_MODULES
), $(MODORDER
)) FORCE
1903 $(call if_changed
,gen_compile_commands
)
1905 targets
+= $(extmod-prefix
)compile_commands.json
1907 PHONY
+= clang-tidy clang-analyzer
1909 ifdef CONFIG_CC_IS_CLANG
1910 quiet_cmd_clang_tools
= CHECK
$<
1911 cmd_clang_tools
= $(PYTHON3
) $(srctree
)/scripts
/clang-tools
/run-clang-tools.py
$@
$<
1913 clang-tidy clang-analyzer
: $(extmod-prefix
)compile_commands.json
1914 $(call cmd
,clang_tools
)
1916 clang-tidy clang-analyzer
:
1917 @echo
"$@ requires CC=clang" >&2
1921 # Scripts to check various things for consistency
1922 # ---------------------------------------------------------------------------
1924 PHONY
+= includecheck versioncheck coccicheck export_report
1927 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1928 -name
'*.[hcS]' -type f
-print |
sort \
1929 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1932 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1933 -name
'*.[hcS]' -type f
-print |
sort \
1934 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1937 $(Q
)$(BASH
) $(srctree
)/scripts
/$@
1940 $(PERL
) $(srctree
)/scripts
/export_report.pl
1942 PHONY
+= checkstack kernelrelease kernelversion image_name
1944 # UML needs a little special treatment here. It wants to use the host
1945 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1946 # else wants $(ARCH), including people doing cross-builds, which means
1947 # that $(SUBARCH) doesn't work here.
1949 CHECKSTACK_ARCH
:= $(SUBARCH
)
1951 CHECKSTACK_ARCH
:= $(ARCH
)
1954 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1955 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1958 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1961 @echo
$(KERNELVERSION
)
1964 @echo
$(KBUILD_IMAGE
)
1966 # Clear a bunch of variables before executing the submake
1968 ifeq ($(quiet
),silent_
)
1973 $(Q
)mkdir
-p
$(objtree
)/tools
1974 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1977 $(Q
)mkdir
-p
$(objtree
)/tools
1978 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1980 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1981 cmd_rmfiles
= rm -rf
$(rm-files
)
1983 # Run depmod only if we have System.map and depmod is executable
1984 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1985 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1988 # read saved command lines for existing targets
1989 existing-targets
:= $(wildcard $(sort $(targets
)))
1991 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
1993 endif # config-build
1995 endif # need-sub-make
2000 # Declare the contents of the PHONY variable as phony. We keep that
2001 # information in a variable so we can use it in if_changed and friends.