1 # SPDX-License-Identifier: GPL-2.0
6 NAME
= Hurr durr I
'ma ninja sloth
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 $(if $(filter __%, $(MAKECMDGOALS)), \
15 $(error targets prefixed with '__
' are only for internal use))
17 # That's our default target when none is given on the command line
21 # We are using a recursive build, so we need to do a little thinking
22 # to get the ordering right.
24 # Most importantly: sub-Makefiles should only ever modify files in
25 # their own directory. If in some directory we have a dependency on
26 # a file in another dir (which doesn't happen often, but it's often
27 # unavoidable when linking the built-in.a targets which finally
28 # turn into vmlinux), we will call a sub make in that other dir, and
29 # after that we are sure that everything which is in that other dir
32 # The only cases where we need to modify files which have global
33 # effects are thus separated out and done before the recursive
34 # descending is started. They are now explicitly listed as the
37 ifneq ($(sub_make_done
),1)
39 # Do not use make's built-in rules and variables
40 # (this increases performance and avoids hard-to-debug behaviour)
43 # Avoid funny character set dependencies
47 export LC_COLLATE LC_NUMERIC
49 # Avoid interference with shell env settings
53 # ---------------------------------------------------------------------------
55 # Normally, we echo the whole command before executing it. By making
56 # that echo $($(quiet)$(cmd)), we now have the possibility to set
57 # $(quiet) to choose other forms of output instead, e.g.
59 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
62 # If $(quiet) is empty, the whole command will be printed.
63 # If it is set to "quiet_", only the short version will be printed.
64 # If it is set to "silent_", nothing will be printed at all, since
65 # the variable $(silent_cmd_cc_o_c) doesn't exist.
67 # A simple variant is to prefix commands with $(Q) - that's useful
68 # for commands that shall be hidden in non-verbose mode.
72 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
74 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
76 # To put more focus on warnings, be less verbose as default
77 # Use 'make V=1' to see the full commands
79 ifeq ("$(origin V)", "command line")
86 ifeq ($(KBUILD_VERBOSE
),1)
94 # If the user is running make -s (silent mode), suppress echoing of
97 ifneq ($(findstring s
,$(filter-out --%,$(MAKEFLAGS
))),)
102 export quiet Q KBUILD_VERBOSE
104 # Call a source code checker (by default, "sparse") as part of the
107 # Use 'make C=1' to enable checking of only re-compiled files.
108 # Use 'make C=2' to enable checking of *all* source files, regardless
109 # of whether they are re-compiled or not.
111 # See the file "Documentation/dev-tools/sparse.rst" for more details,
112 # including where to get the "sparse" utility.
114 ifeq ("$(origin C)", "command line")
115 KBUILD_CHECKSRC
= $(C
)
117 ifndef KBUILD_CHECKSRC
121 export KBUILD_CHECKSRC
123 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
124 # directory of external module to build. Setting M= takes precedence.
125 ifeq ("$(origin M)", "command line")
126 KBUILD_EXTMOD
:= $(M
)
129 $(if
$(word 2, $(KBUILD_EXTMOD
)), \
130 $(error building multiple external modules is not supported
))
132 $(foreach x
, % :, $(if
$(findstring $x, $(KBUILD_EXTMOD
)), \
133 $(error module directory path cannot contain
'$x')))
135 # Remove trailing slashes
136 ifneq ($(filter %/, $(KBUILD_EXTMOD
)),)
137 KBUILD_EXTMOD
:= $(shell dirname
$(KBUILD_EXTMOD
).
)
142 # Kbuild will save output files in the current working directory.
143 # This does not need to match to the root of the kernel source tree.
145 # For example, you can do this:
147 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
149 # If you want to save output files in a different location, there are
150 # two syntaxes to specify it.
153 # Use "make O=dir/to/store/output/files/"
155 # 2) Set KBUILD_OUTPUT
156 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
157 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
159 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
162 # Do we want to change the working directory?
163 ifeq ("$(origin O)", "command line")
164 KBUILD_OUTPUT
:= $(O
)
167 ifneq ($(KBUILD_OUTPUT
),)
168 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
169 # expand a shell special character '~'. We use a somewhat tedious way here.
170 abs_objtree
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) && pwd
)
171 $(if
$(abs_objtree
),, \
172 $(error failed to create output directory
"$(KBUILD_OUTPUT)"))
174 # $(realpath ...) resolves symlinks
175 abs_objtree
:= $(realpath
$(abs_objtree
))
177 abs_objtree
:= $(CURDIR
)
178 endif # ifneq ($(KBUILD_OUTPUT),)
180 ifeq ($(abs_objtree
),$(CURDIR
))
181 # Suppress "Entering directory ..." unless we are changing the work directory.
182 MAKEFLAGS
+= --no-print-directory
187 this-makefile
:= $(lastword
$(MAKEFILE_LIST
))
188 abs_srctree
:= $(realpath
$(dir $(this-makefile
)))
190 ifneq ($(words $(subst :, ,$(abs_srctree
))), 1)
191 $(error source directory cannot contain spaces or colons
)
194 ifneq ($(abs_srctree
),$(abs_objtree
))
195 # Look for make include files relative to root of kernel src
197 # --included-dir is added for backward compatibility, but you should not rely on
198 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
199 MAKEFLAGS
+= --include-dir
=$(abs_srctree
)
202 ifneq ($(filter 3.
%,$(MAKE_VERSION
)),)
203 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
204 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
206 # Cancel implicit rules for this Makefile.
210 export abs_srctree abs_objtree
211 export sub_make_done
:= 1
213 ifeq ($(need-sub-make
),1)
215 PHONY
+= $(MAKECMDGOALS
) __sub-make
217 $(filter-out $(this-makefile
), $(MAKECMDGOALS
)) __all
: __sub-make
220 # Invoke a second make in the output directory, passing relevant variables
222 $(Q
)$(MAKE
) -C
$(abs_objtree
) -f
$(abs_srctree
)/Makefile
$(MAKECMDGOALS
)
224 endif # need-sub-make
225 endif # sub_make_done
227 # We process the rest of the Makefile if this is the final invocation of make
228 ifeq ($(need-sub-make
),)
230 # Do not print "Entering directory ...",
231 # but we want to display it when entering to the output directory
232 # so that IDEs/editors are able to understand relative filenames.
233 MAKEFLAGS
+= --no-print-directory
235 ifeq ($(abs_srctree
),$(abs_objtree
))
236 # building in the source tree
238 building_out_of_srctree
:=
240 ifeq ($(abs_srctree
)/,$(dir $(abs_objtree
)))
241 # building in a subdirectory of the source tree
244 srctree
:= $(abs_srctree
)
246 building_out_of_srctree
:= 1
249 ifneq ($(KBUILD_ABS_SRCTREE
),)
250 srctree
:= $(abs_srctree
)
256 export building_out_of_srctree srctree objtree VPATH
258 # To make sure we do not include .config for any of the *config targets
259 # catch them early, and hand them over to scripts/kconfig/Makefile
260 # It is allowed to specify more targets when calling make, including
261 # mixing *config targets and build targets.
262 # For example 'make oldconfig all'.
263 # Detect when mixed targets is specified, and make a second invocation
264 # of make so .config is not included in this case either (for *config).
266 version_h
:= include/generated
/uapi
/linux
/version.h
268 clean-targets
:= %clean mrproper cleandocs
269 no-dot-config-targets
:= $(clean-targets
) \
270 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
271 $(version_h
) headers headers_
% archheaders archscripts \
272 %asm-generic kernelversion
%src-pkg dt_binding_check \
274 # Installation targets should not require compiler. Unfortunately, vdso_install
275 # is an exception where build artifacts may be updated. This must be fixed.
276 no-compiler-targets
:= $(no-dot-config-targets
) install dtbs_install \
277 headers_install modules_install kernelrelease image_name
278 no-sync-config-targets
:= $(no-dot-config-targets
) %install kernelrelease \
280 single-targets
:= %.a
%.i
%.ko
%.lds
%.ll
%.lst
%.mod
%.o
%.s
%.symtypes
%/
289 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
290 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
295 ifneq ($(filter $(no-compiler-targets
), $(MAKECMDGOALS
)),)
296 ifeq ($(filter-out $(no-compiler-targets
), $(MAKECMDGOALS
)),)
301 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
302 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
307 ifneq ($(KBUILD_EXTMOD
),)
311 ifeq ($(KBUILD_EXTMOD
),)
312 ifneq ($(filter %config
,$(MAKECMDGOALS
)),)
314 ifneq ($(words $(MAKECMDGOALS
)),1)
320 # We cannot build single targets and the others at the same time
321 ifneq ($(filter $(single-targets
), $(MAKECMDGOALS
)),)
323 ifneq ($(filter-out $(single-targets
), $(MAKECMDGOALS
)),)
328 # For "make -j clean all", "make -j mrproper defconfig all", etc.
329 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
330 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
335 # install and modules_install need also be processed one by one
336 ifneq ($(filter install,$(MAKECMDGOALS
)),)
337 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
343 # ===========================================================================
344 # We're called with mixed targets (*config and build targets).
345 # Handle them one by one.
347 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
349 $(MAKECMDGOALS
): __build_one_by_one
354 for i in
$(MAKECMDGOALS
); do \
355 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
360 include $(srctree
)/scripts
/Kbuild.
include
362 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
363 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
364 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
365 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
367 include $(srctree
)/scripts
/subarch.
include
369 # Cross compiling and selecting different set of gcc/bin-utils
370 # ---------------------------------------------------------------------------
372 # When performing cross compilation for other architectures ARCH shall be set
373 # to the target architecture. (See arch/* for the possibilities).
374 # ARCH can be set during invocation of make:
376 # Another way is to have ARCH set in the environment.
377 # The default ARCH is the host where make is executed.
379 # CROSS_COMPILE specify the prefix used for all executables used
380 # during compilation. Only gcc and related bin-utils executables
381 # are prefixed with $(CROSS_COMPILE).
382 # CROSS_COMPILE can be set on the command line
383 # make CROSS_COMPILE=ia64-linux-
384 # Alternatively CROSS_COMPILE can be set in the environment.
385 # Default value for CROSS_COMPILE is not to prefix executables
386 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
389 # Architecture as present in compile.h
390 UTS_MACHINE
:= $(ARCH
)
393 # Additional ARCH settings for x86
397 ifeq ($(ARCH
),x86_64
)
401 # Additional ARCH settings for sparc
402 ifeq ($(ARCH
),sparc32
)
405 ifeq ($(ARCH
),sparc64
)
409 # Additional ARCH settings for parisc
410 ifeq ($(ARCH
),parisc64
)
414 export cross_compiling
:=
415 ifneq ($(SRCARCH
),$(SUBARCH
))
419 KCONFIG_CONFIG ?
= .config
420 export KCONFIG_CONFIG
422 # SHELL used by kbuild
425 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
426 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
427 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
430 ifneq ($(filter %/,$(LLVM
)),)
431 LLVM_PREFIX
:= $(LLVM
)
432 else ifneq ($(filter -%,$(LLVM
)),)
433 LLVM_SUFFIX
:= $(LLVM
)
436 HOSTCC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
437 HOSTCXX
= $(LLVM_PREFIX
)clang
++$(LLVM_SUFFIX
)
442 HOSTPKG_CONFIG
= pkg-config
444 KBUILD_USERHOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes \
445 -O2
-fomit-frame-pointer
-std
=gnu11 \
446 -Wdeclaration-after-statement
447 KBUILD_USERCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(USERCFLAGS
)
448 KBUILD_USERLDFLAGS
:= $(USERLDFLAGS
)
450 KBUILD_HOSTCFLAGS
:= $(KBUILD_USERHOSTCFLAGS
) $(HOST_LFS_CFLAGS
) $(HOSTCFLAGS
)
451 KBUILD_HOSTCXXFLAGS
:= -Wall
-O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
452 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
453 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
455 # Make variables (CC, etc...)
458 CC
= $(LLVM_PREFIX
)clang
$(LLVM_SUFFIX
)
459 LD
= $(LLVM_PREFIX
)ld.lld
$(LLVM_SUFFIX
)
460 AR
= $(LLVM_PREFIX
)llvm-ar
$(LLVM_SUFFIX
)
461 NM
= $(LLVM_PREFIX
)llvm-nm
$(LLVM_SUFFIX
)
462 OBJCOPY
= $(LLVM_PREFIX
)llvm-objcopy
$(LLVM_SUFFIX
)
463 OBJDUMP
= $(LLVM_PREFIX
)llvm-objdump
$(LLVM_SUFFIX
)
464 READELF
= $(LLVM_PREFIX
)llvm-readelf
$(LLVM_SUFFIX
)
465 STRIP
= $(LLVM_PREFIX
)llvm-strip
$(LLVM_SUFFIX
)
467 CC
= $(CROSS_COMPILE
)gcc
468 LD
= $(CROSS_COMPILE
)ld
469 AR
= $(CROSS_COMPILE
)ar
470 NM
= $(CROSS_COMPILE
)nm
471 OBJCOPY
= $(CROSS_COMPILE
)objcopy
472 OBJDUMP
= $(CROSS_COMPILE
)objdump
473 READELF
= $(CROSS_COMPILE
)readelf
474 STRIP
= $(CROSS_COMPILE
)strip
477 RESOLVE_BTFIDS
= $(objtree
)/tools
/bpf
/resolve_btfids
/resolve_btfids
481 INSTALLKERNEL
:= installkernel
495 PAHOLE_FLAGS
= $(shell PAHOLE
=$(PAHOLE
) $(srctree
)/scripts
/pahole-flags.sh
)
497 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
498 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
507 # Use USERINCLUDE when you must reference the UAPI directories only.
509 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
510 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
511 -I
$(srctree
)/include/uapi \
512 -I
$(objtree
)/include/generated
/uapi \
513 -include $(srctree
)/include/linux
/compiler-version.h \
514 -include $(srctree
)/include/linux
/kconfig.h
516 # Use LINUXINCLUDE when you must reference the include/ directory.
517 # Needed to be compatible with the O= option
519 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
520 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
521 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
522 -I
$(objtree
)/include \
525 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
526 KBUILD_CFLAGS
:= -Wall
-Wundef
-Werror
=strict-prototypes
-Wno-trigraphs \
527 -fno-strict-aliasing
-fno-common
-fshort-wchar
-fno-PIE \
528 -Werror
=implicit-function-declaration
-Werror
=implicit-int \
529 -Werror
=return-type
-Wno-format-security \
531 KBUILD_CPPFLAGS
:= -D__KERNEL__
532 KBUILD_AFLAGS_KERNEL
:=
533 KBUILD_CFLAGS_KERNEL
:=
534 KBUILD_AFLAGS_MODULE
:= -DMODULE
535 KBUILD_CFLAGS_MODULE
:= -DMODULE
536 KBUILD_LDFLAGS_MODULE
:=
540 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
541 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
542 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
543 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
544 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
545 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
547 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
548 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
549 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
550 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
551 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
554 # Files to ignore in find ... statements
556 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
557 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
559 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
560 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
562 # ===========================================================================
563 # Rules shared between *config targets and build targets
565 # Basic helpers built in scripts/basic/
566 PHONY
+= scripts_basic
568 $(Q
)$(MAKE
) $(build
)=scripts
/basic
570 PHONY
+= outputmakefile
571 ifdef building_out_of_srctree
572 # Before starting out-of-tree build, make sure the source tree is clean.
573 # outputmakefile generates a Makefile in the output directory, if using a
574 # separate output directory. This allows convenient use of make in the
576 # At the same time when output Makefile generated, generate .gitignore to
577 # ignore whole output directory
579 quiet_cmd_makefile
= GEN Makefile
581 echo
"\# Automatically generated by $(srctree)/Makefile: don't edit"; \
582 echo
"include $(srctree)/Makefile"; \
586 $(Q
)if
[ -f
$(srctree
)/.config
-o \
587 -d
$(srctree
)/include/config
-o \
588 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
590 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
591 echo
>&2 "*** in $(abs_srctree)";\
595 $(Q
)ln
-fsn
$(srctree
) source
597 $(Q
)test -e .gitignore || \
598 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
601 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
602 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
603 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
604 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
605 CC_VERSION_TEXT
= $(subst $(pound
),,$(shell LC_ALL
=C
$(CC
) --version
2>/dev
/null | head
-n
1))
607 ifneq ($(findstring clang
,$(CC_VERSION_TEXT
)),)
608 include $(srctree
)/scripts
/Makefile.clang
611 # Include this also for config targets because some architectures need
612 # cc-cross-prefix to determine CROSS_COMPILE.
614 include $(srctree
)/scripts
/Makefile.compiler
618 # ===========================================================================
619 # *config targets only - make sure prerequisites are updated, and descend
620 # in scripts/kconfig to make the *config target
622 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
623 # KBUILD_DEFCONFIG may point out an alternative default configuration
624 # used for 'make defconfig'
625 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
626 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
628 config
: outputmakefile scripts_basic FORCE
629 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
631 %config
: outputmakefile scripts_basic FORCE
632 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
635 # ===========================================================================
636 # Build targets only - this includes vmlinux, arch specific targets, clean
637 # targets and others. In general all targets except *config targets.
639 # If building an external module we do not care about the all: rule
640 # but instead __all depend on modules
642 ifeq ($(KBUILD_EXTMOD
),)
648 # Decide whether to build built-in, modular, or both.
649 # Normally, just do built-in.
654 # If we have only "make modules", don't compile built-in objects.
655 ifeq ($(MAKECMDGOALS
),modules
)
659 # If we have "make <whatever> modules", compile modules
660 # in addition to whatever we do anyway.
661 # Just "make" or "make all" shall build modules as well
663 ifneq ($(filter all modules nsdeps
%compile_commands.json clang-
%,$(MAKECMDGOALS
)),)
667 ifeq ($(MAKECMDGOALS
),)
671 export KBUILD_MODULES KBUILD_BUILTIN
674 include include/config
/auto.conf
677 ifeq ($(KBUILD_EXTMOD
),)
678 # Objects we will link into vmlinux / subdirs we need to visit
679 core-y
:= init
/ usr
/ arch
/$(SRCARCH
)/
680 drivers-y
:= drivers
/ sound
/
681 drivers-
$(CONFIG_SAMPLES
) += samples
/
682 drivers-
$(CONFIG_NET
) += net
/
685 endif # KBUILD_EXTMOD
687 # The all: target is the default when no target is given on the
689 # This allow a user to issue only 'make' to build a kernel including modules
690 # Defaults to vmlinux, but the arch makefile usually adds further targets
693 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
694 ifdef CONFIG_CC_IS_GCC
695 CFLAGS_GCOV
+= -fno-tree-loop-im
699 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
700 ifdef CONFIG_FUNCTION_TRACER
701 CC_FLAGS_FTRACE
:= -pg
704 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
707 ifdef may-sync-config
708 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
709 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
710 # because some architectures define CROSS_COMPILE there.
711 include include/config
/auto.conf.cmd
715 @echo
>&2 '*** Configuration file "$@" not found!'
717 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
718 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
722 # The actual configuration files used during the build are stored in
723 # include/generated/ and include/config/. Update them if .config is newer than
724 # include/config/auto.conf (which mirrors .config).
726 # This exploits the 'multi-target pattern rule' trick.
727 # The syncconfig should be executed only once to make all the targets.
728 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
730 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
731 # so you cannot notice that Kconfig is waiting for the user input.
732 %/config
/auto.conf
%/config
/auto.conf.cmd
%/generated
/autoconf.h
: $(KCONFIG_CONFIG
)
733 $(Q
)$(kecho
) " SYNC $@"
734 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
735 else # !may-sync-config
736 # External modules and some install targets need include/generated/autoconf.h
737 # and include/config/auto.conf but do not care if they are up-to-date.
738 # Use auto.conf to trigger the test
739 PHONY
+= include/config
/auto.conf
741 include/config
/auto.conf
:
742 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
744 echo
>&2 " ERROR: Kernel configuration is invalid."; \
745 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
746 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
750 endif # may-sync-config
753 KBUILD_CFLAGS
+= -fno-delete-null-pointer-checks
754 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
755 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
756 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
757 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
759 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
761 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
765 # Tell gcc to never replace conditional load with a non-conditional one
766 ifdef CONFIG_CC_IS_GCC
767 # gcc-10 renamed --param=allow-store-data-races=0 to
768 # -fno-allow-store-data-races.
769 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
770 KBUILD_CFLAGS
+= $(call cc-option
,-fno-allow-store-data-races
)
773 ifdef CONFIG_READABLE_ASM
774 # Disable optimizations that make assembler listings hard to read.
775 # reorder blocks reorders the control in the function
776 # ipa clone creates specialized cloned functions
777 # partial inlining inlines only parts of functions
778 KBUILD_CFLAGS
+= -fno-reorder-blocks
-fno-ipa-cp-clone
-fno-partial-inlining
781 ifneq ($(CONFIG_FRAME_WARN
),0)
782 KBUILD_CFLAGS
+= -Wframe-larger-than
=$(CONFIG_FRAME_WARN
)
785 stackp-flags-y
:= -fno-stack-protector
786 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
787 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
789 KBUILD_CFLAGS
+= $(stackp-flags-y
)
791 KBUILD_CFLAGS-
$(CONFIG_WERROR
) += -Werror
792 KBUILD_CFLAGS-
$(CONFIG_CC_NO_ARRAY_BOUNDS
) += -Wno-array-bounds
793 KBUILD_CFLAGS
+= $(KBUILD_CFLAGS-y
) $(CONFIG_CC_IMPLICIT_FALLTHROUGH
)
795 ifdef CONFIG_CC_IS_CLANG
796 KBUILD_CPPFLAGS
+= -Qunused-arguments
797 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
798 KBUILD_CFLAGS
+= -Wno-gnu
801 # gcc inanely warns about local variables called 'main'
802 KBUILD_CFLAGS
+= -Wno-main
805 # These warnings generated too much noise in a regular build.
806 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
807 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
808 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
810 # These result in bogus false positives
811 KBUILD_CFLAGS
+= $(call cc-disable-warning
, dangling-pointer
)
813 ifdef CONFIG_FRAME_POINTER
814 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
816 # Some targets (ARM with Thumb2, for example), can't be built with frame
817 # pointers. For those, we don't have FUNCTION_TRACER automatically
818 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
819 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
820 # -fomit-frame-pointer with FUNCTION_TRACER.
821 ifndef CONFIG_FUNCTION_TRACER
822 KBUILD_CFLAGS
+= -fomit-frame-pointer
826 # Initialize all stack variables with a 0xAA pattern.
827 ifdef CONFIG_INIT_STACK_ALL_PATTERN
828 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
831 # Initialize all stack variables with a zero value.
832 ifdef CONFIG_INIT_STACK_ALL_ZERO
833 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=zero
834 ifdef CONFIG_CC_IS_CLANG
835 # https://bugs.llvm.org/show_bug.cgi?id=45497
836 KBUILD_CFLAGS
+= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
840 # While VLAs have been removed, GCC produces unreachable stack probes
841 # for the randomize_kstack_offset feature. Disable it for all compilers.
842 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-clash-protection
)
844 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
845 ifdef CONFIG_ZERO_CALL_USED_REGS
846 KBUILD_CFLAGS
+= -fzero-call-used-regs
=used-gpr
849 ifdef CONFIG_FUNCTION_TRACER
850 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
851 CC_FLAGS_FTRACE
+= -mrecord-mcount
852 ifdef CONFIG_HAVE_NOP_MCOUNT
853 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
854 CC_FLAGS_FTRACE
+= -mnop-mcount
855 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
859 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
860 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
862 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
863 ifdef CONFIG_HAVE_C_RECORDMCOUNT
864 BUILD_C_RECORDMCOUNT
:= y
865 export BUILD_C_RECORDMCOUNT
868 ifdef CONFIG_HAVE_FENTRY
869 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
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
)
880 # We trigger additional mismatches with less inlining
881 ifdef CONFIG_DEBUG_SECTION_MISMATCH
882 KBUILD_CFLAGS
+= -fno-inline-functions-called-once
885 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
886 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
887 LDFLAGS_vmlinux
+= --gc-sections
890 ifdef CONFIG_SHADOW_CALL_STACK
891 CC_FLAGS_SCS
:= -fsanitize
=shadow-call-stack
892 KBUILD_CFLAGS
+= $(CC_FLAGS_SCS
)
896 ifdef CONFIG_LTO_CLANG
897 ifdef CONFIG_LTO_CLANG_THIN
898 CC_FLAGS_LTO
:= -flto
=thin
-fsplit-lto-unit
899 KBUILD_LDFLAGS
+= --thinlto-cache-dir
=$(extmod_prefix
).thinlto-cache
901 CC_FLAGS_LTO
:= -flto
903 CC_FLAGS_LTO
+= -fvisibility
=hidden
905 # Limit inlining across translation units to reduce binary size
906 KBUILD_LDFLAGS
+= -mllvm
-import-instr-limit
=5
908 # Check for frame size exceeding threshold during prolog/epilog insertion
909 # when using lld < 13.0.0.
910 ifneq ($(CONFIG_FRAME_WARN
),0)
911 ifeq ($(shell test $(CONFIG_LLD_VERSION
) -lt
130000; echo
$$?
),0)
912 KBUILD_LDFLAGS
+= -plugin-opt
=-warn-stack-size
=$(CONFIG_FRAME_WARN
)
918 KBUILD_CFLAGS
+= -fno-lto
$(CC_FLAGS_LTO
)
919 KBUILD_AFLAGS
+= -fno-lto
923 ifdef CONFIG_CFI_CLANG
924 CC_FLAGS_CFI
:= -fsanitize
=cfi \
925 -fsanitize-cfi-cross-dso \
926 -fno-sanitize-cfi-canonical-jump-tables \
927 -fno-sanitize-trap
=cfi \
928 -fno-sanitize-blacklist
930 ifdef CONFIG_CFI_PERMISSIVE
931 CC_FLAGS_CFI
+= -fsanitize-recover
=cfi
934 # If LTO flags are filtered out, we must also filter out CFI.
935 CC_FLAGS_LTO
+= $(CC_FLAGS_CFI
)
936 KBUILD_CFLAGS
+= $(CC_FLAGS_CFI
)
940 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
941 KBUILD_CFLAGS
+= -falign-functions
=64
944 # arch Makefile may override CC so keep this after arch Makefile is included
945 NOSTDINC_FLAGS
+= -nostdinc
947 # warn about C99 declaration after statement
948 KBUILD_CFLAGS
+= -Wdeclaration-after-statement
950 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
951 KBUILD_CFLAGS
+= -Wvla
953 # disable pointer signed / unsigned warnings in gcc 4.0
954 KBUILD_CFLAGS
+= -Wno-pointer-sign
956 # In order to make sure new function cast mismatches are not introduced
957 # in the kernel (to avoid tripping CFI checking), the kernel should be
958 # globally built with -Wcast-function-type.
959 KBUILD_CFLAGS
+= $(call cc-option
, -Wcast-function-type
)
961 # disable stringop warnings in gcc 8+
962 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
964 # We'll want to enable this eventually, but it's not going away for 5.7 at least
965 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-overflow
)
967 # Another good warning that we'll want to enable eventually
968 KBUILD_CFLAGS
+= $(call cc-disable-warning
, restrict
)
970 # Enabled with W=2, disabled by default as noisy
971 ifdef CONFIG_CC_IS_GCC
972 KBUILD_CFLAGS
+= -Wno-maybe-uninitialized
975 ifdef CONFIG_CC_IS_GCC
976 # The allocators already balk at large sizes, so silence the compiler
977 # warnings for bounds checks involving those possible values. While
978 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
979 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
980 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
981 # doesn't work (as it is documented to), silently resolving to "0" prior to
982 # version 9.1 (and producing an error more recently). Numeric values larger
983 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
984 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
985 # choice, we must perform a versioned check to disable this warning.
986 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
987 KBUILD_CFLAGS
+= $(call cc-ifversion
, -ge
, 0901, -Wno-alloc-size-larger-than
)
990 # disable invalid "can't wrap" optimizations for signed / pointers
991 KBUILD_CFLAGS
+= -fno-strict-overflow
993 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
994 KBUILD_CFLAGS
+= -fno-stack-check
996 # conserve stack if available
997 ifdef CONFIG_CC_IS_GCC
998 KBUILD_CFLAGS
+= -fconserve-stack
1001 # Prohibit date/time macros, which would make the build non-deterministic
1002 KBUILD_CFLAGS
+= -Werror
=date-time
1004 # enforce correct pointer usage
1005 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
1007 # Require designated initializers for all marked structures
1008 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
1010 # change __FILE__ to the relative path from the srctree
1011 KBUILD_CPPFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
1013 # include additional Makefiles when needed
1014 include-y
:= scripts
/Makefile.extrawarn
1015 include-
$(CONFIG_DEBUG_INFO
) += scripts
/Makefile.debug
1016 include-
$(CONFIG_KASAN
) += scripts
/Makefile.kasan
1017 include-
$(CONFIG_KCSAN
) += scripts
/Makefile.kcsan
1018 include-
$(CONFIG_UBSAN
) += scripts
/Makefile.ubsan
1019 include-
$(CONFIG_KCOV
) += scripts
/Makefile.kcov
1020 include-
$(CONFIG_RANDSTRUCT
) += scripts
/Makefile.randstruct
1021 include-
$(CONFIG_GCC_PLUGINS
) += scripts
/Makefile.gcc-plugins
1023 include $(addprefix $(srctree
)/, $(include-y
))
1025 # scripts/Makefile.gcc-plugins is intentionally included last.
1026 # Do not add $(call cc-option,...) below this line. When you build the kernel
1027 # from the clean source tree, the GCC plugins do not exist at this point.
1029 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1030 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
1031 KBUILD_AFLAGS
+= $(KAFLAGS
)
1032 KBUILD_CFLAGS
+= $(KCFLAGS
)
1034 KBUILD_LDFLAGS_MODULE
+= --build-id
=sha1
1035 LDFLAGS_vmlinux
+= --build-id
=sha1
1037 KBUILD_LDFLAGS
+= -z noexecstack
1038 ifeq ($(CONFIG_LD_IS_BFD
),y
)
1039 KBUILD_LDFLAGS
+= $(call ld-option
,--no-warn-rwx-segments
)
1042 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
1043 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
1046 ifeq ($(CONFIG_RELR
),y
)
1047 LDFLAGS_vmlinux
+= --pack-dyn-relocs
=relr
--use-android-relr-tags
1050 # We never want expected sections to be placed heuristically by the
1051 # linker. All sections should be explicitly named in the linker script.
1052 ifdef CONFIG_LD_ORPHAN_WARN
1053 LDFLAGS_vmlinux
+= --orphan-handling
=warn
1056 # Align the bit size of userspace programs with the kernel
1057 KBUILD_USERCFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1058 KBUILD_USERLDFLAGS
+= $(filter -m32
-m64
--target
=%, $(KBUILD_CFLAGS
))
1060 # make the checker run with the right architecture
1061 CHECKFLAGS
+= --arch
=$(ARCH
)
1063 # insure the checker run with the right endianness
1064 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
1066 # the checker needs the correct machine size
1067 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
1069 # Default kernel image to build when no specific target is given.
1070 # KBUILD_IMAGE may be overruled on the command line or
1071 # set in the environment
1072 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1073 # this default value
1074 export KBUILD_IMAGE ?
= vmlinux
1077 # INSTALL_PATH specifies where to place the updated kernel and system map
1078 # images. Default is /boot, but you can set it to other values
1079 export INSTALL_PATH ?
= /boot
1082 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1083 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1084 # an argument if needed. Otherwise it defaults to the kernel install path
1086 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
1089 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1090 # relocations required by build roots. This is not defined in the
1091 # makefile but the argument can be passed to make if needed.
1094 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
1099 export extmod_prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
1100 export MODORDER
:= $(extmod_prefix
)modules.order
1101 export MODULES_NSDEPS
:= $(extmod_prefix
)modules.nsdeps
1103 ifeq ($(KBUILD_EXTMOD
),)
1104 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/
1105 core-
$(CONFIG_BLOCK
) += block
/
1106 core-
$(CONFIG_IO_URING
) += io_uring
/
1108 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, \
1109 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
1110 $(libs-y
) $(libs-m
)))
1112 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) Documentation \
1113 $(patsubst %/,%,$(filter %/, $(core-
) \
1114 $(drivers-
) $(libs-
))))
1116 build-dirs
:= $(vmlinux-dirs
)
1117 clean-dirs
:= $(vmlinux-alldirs
)
1119 subdir-modorder
:= $(addsuffix /modules.order
, $(build-dirs
))
1121 # Externally visible symbols (used by link-vmlinux.sh)
1122 KBUILD_VMLINUX_OBJS
:= $(head-y
) $(patsubst %/,%/built-in.a
, $(core-y
))
1123 KBUILD_VMLINUX_OBJS
+= $(addsuffix built-in.a
, $(filter %/, $(libs-y
)))
1124 ifdef CONFIG_MODULES
1125 KBUILD_VMLINUX_OBJS
+= $(patsubst %/, %/lib.a
, $(filter %/, $(libs-y
)))
1126 KBUILD_VMLINUX_LIBS
:= $(filter-out %/, $(libs-y
))
1128 KBUILD_VMLINUX_LIBS
:= $(patsubst %/,%/lib.a
, $(libs-y
))
1130 KBUILD_VMLINUX_OBJS
+= $(patsubst %/,%/built-in.a
, $(drivers-y
))
1132 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1133 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1134 # used by scripts/Makefile.package
1135 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) LICENSES arch
include scripts tools
)
1137 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)
1139 # Recurse until adjust_autoksyms.sh is satisfied
1140 PHONY
+= autoksyms_recursive
1141 ifdef CONFIG_TRIM_UNUSED_KSYMS
1142 # For the kernel to actually contain only the needed exported symbols,
1143 # we have to build modules as well to determine what those symbols are.
1144 # (this can be evaluated only once include/config/auto.conf has been included)
1147 autoksyms_recursive
: descend modules.order
1148 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1149 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1152 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1154 quiet_cmd_autoksyms_h
= GEN
$@
1155 cmd_autoksyms_h
= mkdir
-p
$(dir $@
); \
1156 $(CONFIG_SHELL
) $(srctree
)/scripts
/gen_autoksyms.sh
$@
1159 $(call cmd
,autoksyms_h
)
1161 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1163 # Final link of vmlinux with optional arch pass after final link
1164 cmd_link-vmlinux
= \
1165 $(CONFIG_SHELL
) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1166 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1168 vmlinux
: scripts
/link-vmlinux.sh autoksyms_recursive
$(vmlinux-deps
) FORCE
1169 +$(call if_changed_dep
,link-vmlinux
)
1173 # The actual objects are generated when descending,
1174 # make sure no implicit rule kicks in
1175 $(sort $(vmlinux-deps
) $(subdir-modorder
)): descend
;
1177 filechk_kernel.release
= \
1178 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1180 # Store (new) KERNELRELEASE string in include/config/kernel.release
1181 include/config
/kernel.release
: FORCE
1182 $(call filechk
,kernel.release
)
1184 # Additional helpers built in scripts/
1185 # Carefully list dependencies so we do not try to build scripts twice
1188 scripts
: scripts_basic scripts_dtc
1189 $(Q
)$(MAKE
) $(build
)=$(@
)
1191 # Things we need to do before we recursively start building the kernel
1192 # or the modules are listed in "prepare".
1193 # A multi level approach is used. prepareN is processed before prepareN-1.
1194 # archprepare is used in arch Makefiles and when processed asm symlink,
1195 # version.h and scripts_basic is processed / created.
1197 PHONY
+= prepare archprepare
1199 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1200 asm-generic
$(version_h
) $(autoksyms_h
) include/generated
/utsrelease.h \
1201 include/generated
/autoconf.h remove-stale-files
1203 prepare0
: archprepare
1204 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1205 $(Q
)$(MAKE
) $(build
)=.
1207 # All the preparing..
1210 PHONY
+= remove-stale-files
1212 $(Q
)$(srctree
)/scripts
/remove-stale-files
1214 # Support for using generic headers in asm-generic
1215 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1217 PHONY
+= asm-generic uapi-asm-generic
1218 asm-generic
: uapi-asm-generic
1219 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1220 generic
=include/asm-generic
1222 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1223 generic
=include/uapi
/asm-generic
1225 # Generate some files
1226 # ---------------------------------------------------------------------------
1228 # KERNELRELEASE can change from a few different places, meaning version.h
1229 # needs to be updated, so this check is forced on all builds
1232 define filechk_utsrelease.h
1233 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1234 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1237 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1240 define filechk_version.h
1241 if
[ $(SUBLEVEL
) -gt
255 ]; then \
1242 echo \
#define LINUX_VERSION_CODE $(shell \
1243 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + 255); \
1245 echo \
#define LINUX_VERSION_CODE $(shell \
1246 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
1248 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1249 ((c) > 255 ? 255 : (c)))'; \
1250 echo \
#define LINUX_VERSION_MAJOR $(VERSION); \
1251 echo \
#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1252 echo \
#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1255 $(version_h
): PATCHLEVEL
:= $(or
$(PATCHLEVEL
), 0)
1256 $(version_h
): SUBLEVEL
:= $(or
$(SUBLEVEL
), 0)
1258 $(call filechk
,version.h
)
1260 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1261 $(call filechk
,utsrelease.h
)
1265 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1266 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1268 # ---------------------------------------------------------------------------
1271 #Default location for installed headers
1272 export INSTALL_HDR_PATH
= $(objtree
)/usr
1274 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1275 cmd_headers_install
= \
1276 mkdir
-p
$(INSTALL_HDR_PATH
); \
1277 rsync
-mrl
--include='*/' --include='*\.h' --exclude
='*' \
1278 usr
/include $(INSTALL_HDR_PATH
)
1280 PHONY
+= headers_install
1281 headers_install
: headers
1282 $(call cmd
,headers_install
)
1284 PHONY
+= archheaders archscripts
1286 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1289 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1290 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1291 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1292 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1293 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1295 ifdef CONFIG_HEADERS_INSTALL
1299 PHONY
+= scripts_unifdef
1300 scripts_unifdef
: scripts_basic
1301 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1303 # ---------------------------------------------------------------------------
1306 # Many distributions have the custom install script, /sbin/installkernel.
1307 # If DKMS is installed, 'make install' will eventually recurse back
1308 # to this Makefile to build and install external modules.
1309 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1311 quiet_cmd_install
= INSTALL
$(INSTALL_PATH
)
1312 cmd_install
= unset sub_make_done
; $(srctree
)/scripts
/install.sh
1314 # ---------------------------------------------------------------------------
1317 ifdef CONFIG_OBJTOOL
1318 prepare
: tools
/objtool
1322 ifdef CONFIG_DEBUG_INFO_BTF
1323 prepare
: tools
/bpf
/resolve_btfids
1327 PHONY
+= resolve_btfids_clean
1329 resolve_btfids_O
= $(abspath
$(objtree
))/tools
/bpf
/resolve_btfids
1331 # tools/bpf/resolve_btfids directory might not exist
1332 # in output directory, skip its clean in that case
1333 resolve_btfids_clean
:
1334 ifneq ($(wildcard $(resolve_btfids_O
)),)
1335 $(Q
)$(MAKE
) -sC
$(srctree
)/tools
/bpf
/resolve_btfids O
=$(resolve_btfids_O
) clean
1338 # Clear a bunch of variables before executing the submake
1339 ifeq ($(quiet
),silent_
)
1344 $(Q
)mkdir
-p
$(objtree
)/tools
1345 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1348 $(Q
)mkdir
-p
$(objtree
)/tools
1349 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1351 # ---------------------------------------------------------------------------
1356 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1358 kselftest-
%: headers FORCE
1359 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1361 PHONY
+= kselftest-merge
1363 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1364 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config | \
1365 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-m
$(objtree
)/.config
1366 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1368 # ---------------------------------------------------------------------------
1371 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1372 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1378 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1380 %.dtbo
: dtbs_prepare
1381 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1383 PHONY
+= dtbs dtbs_prepare dtbs_install dtbs_check
1385 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1387 # include/config/kernel.release is actually needed when installing DTBs because
1388 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1389 # dtbs_install depend on it as dtbs_install may run as root.
1390 dtbs_prepare
: include/config
/kernel.release scripts_dtc
1392 ifneq ($(filter dtbs_check
, $(MAKECMDGOALS
)),)
1394 dtbs
: dt_binding_check
1400 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
) dst
=$(INSTALL_DTBS_PATH
)
1402 ifdef CONFIG_OF_EARLY_FLATTREE
1408 PHONY
+= scripts_dtc
1409 scripts_dtc
: scripts_basic
1410 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1412 ifneq ($(filter dt_binding_check
, $(MAKECMDGOALS
)),)
1413 export CHECK_DT_BINDING
=y
1416 PHONY
+= dt_binding_check
1417 dt_binding_check
: scripts_dtc
1418 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1420 # ---------------------------------------------------------------------------
1423 ifdef CONFIG_MODULES
1425 # By default, build modules as well
1429 # When we're building modules with modversions, we need to consider
1430 # the built-in objects during the descend as well, in order to
1431 # make sure the checksums are up to date before we record them.
1432 ifdef CONFIG_MODVERSIONS
1438 # A module can be listed more than once in obj-m resulting in
1439 # duplicate lines in modules.order files. Those are removed
1440 # using awk while concatenating to the final file.
1443 modules
: $(if
$(KBUILD_BUILTIN
),vmlinux
) modules_check modules_prepare
1445 cmd_modules_order
= $(AWK
) '!x[$$0]++' $(real-prereqs
) > $@
1447 modules.order
: $(subdir-modorder
) FORCE
1448 $(call if_changed
,modules_order
)
1450 targets
+= modules.order
1452 # Target to prepare building external modules
1453 PHONY
+= modules_prepare
1454 modules_prepare
: prepare
1455 $(Q
)$(MAKE
) $(build
)=scripts scripts
/module.lds
1457 export modules_sign_only
:=
1459 ifeq ($(CONFIG_MODULE_SIG
),y
)
1460 PHONY
+= modules_sign
1461 modules_sign
: modules_install
1464 # modules_sign is a subset of modules_install.
1465 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1466 ifeq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1467 modules_sign_only
:= y
1472 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
1473 modinst_pre
:= __modinst_pre
1476 modules_install
: $(modinst_pre
)
1477 PHONY
+= __modinst_pre
1479 @
rm -rf
$(MODLIB
)/kernel
1480 @
rm -f
$(MODLIB
)/source
1481 @mkdir
-p
$(MODLIB
)/kernel
1482 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1483 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1484 rm -f
$(MODLIB
)/build
; \
1485 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1487 @sed
's:^:kernel/:' modules.order
> $(MODLIB
)/modules.order
1488 @cp
-f modules.builtin
$(MODLIB
)/
1489 @cp
-f
$(objtree
)/modules.builtin.modinfo
$(MODLIB
)/
1491 endif # CONFIG_MODULES
1494 # Cleaning is done on three levels.
1495 # make clean Delete most generated files
1496 # Leave enough to build external modules
1497 # make mrproper Delete the current configuration, and all generated files
1498 # make distclean Remove editor backup files, patch leftover files and the like
1500 # Directories & files removed with 'make clean'
1501 CLEAN_FILES
+= include/ksym vmlinux.symvers modules-only.symvers \
1502 modules.builtin modules.builtin.modinfo modules.nsdeps \
1503 compile_commands.json .thinlto-cache
1505 # Directories & files removed with 'make mrproper'
1506 MRPROPER_FILES
+= include/config
include/generated \
1507 arch
/$(SRCARCH
)/include/generated .objdiff \
1508 debian snap tar-install \
1509 .config .config.old .version \
1511 certs
/signing_key.pem \
1516 # clean - Delete most, but leave enough to build external modules
1518 clean: rm-files
:= $(CLEAN_FILES
)
1520 PHONY
+= archclean vmlinuxclean
1523 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1524 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1526 clean: archclean vmlinuxclean resolve_btfids_clean
1528 # mrproper - Delete all generated files, including .config
1530 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1531 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1533 PHONY
+= $(mrproper-dirs
) mrproper
1535 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1537 mrproper
: clean $(mrproper-dirs
)
1545 @find .
$(RCS_FIND_IGNORE
) \
1546 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1547 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1548 -o
-name
'core' -o
-name
tags -o
-name TAGS
-o
-name
'cscope*' \
1549 -o
-name GPATH
-o
-name GRTAGS
-o
-name GSYMS
-o
-name GTAGS \
) \
1550 -type f
-print | xargs
rm -f
1553 # Packaging of the kernel to various formats
1554 # ---------------------------------------------------------------------------
1557 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1558 %pkg
: include/config
/kernel.release FORCE
1559 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1561 # Brief documentation of the typical targets used
1562 # ---------------------------------------------------------------------------
1564 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1565 boards
:= $(sort $(notdir $(boards
)))
1566 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1567 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1571 @echo
'Cleaning targets:'
1572 @echo
' clean - Remove most generated files but keep the config and'
1573 @echo
' enough build support to build external modules'
1574 @echo
' mrproper - Remove all generated files + config + various backup files'
1575 @echo
' distclean - mrproper + remove editor backup and patch files'
1577 @echo
'Configuration targets:'
1578 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1580 @echo
'Other generic targets:'
1581 @echo
' all - Build all targets marked with [*]'
1582 @echo
'* vmlinux - Build the bare kernel'
1583 @echo
'* modules - Build all modules'
1584 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1585 @echo
' dir/ - Build all files in dir and below'
1586 @echo
' dir/file.[ois] - Build specified target only'
1587 @echo
' dir/file.ll - Build the LLVM assembly file'
1588 @echo
' (requires compiler support for LLVM assembly generation)'
1589 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1590 @echo
' (requires a recent binutils and recent build (System.map))'
1591 @echo
' dir/file.ko - Build module including final link'
1592 @echo
' modules_prepare - Set up for building external modules'
1593 @echo
' tags/TAGS - Generate tags file for editors'
1594 @echo
' cscope - Generate cscope index'
1595 @echo
' gtags - Generate GNU GLOBAL index'
1596 @echo
' kernelrelease - Output the release version string (use with make -s)'
1597 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1598 @echo
' image_name - Output the image name (use with make -s)'
1599 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1600 echo
' (default: $(INSTALL_HDR_PATH))'; \
1602 @echo
'Static analysers:'
1603 @echo
' checkstack - Generate a list of stack hogs'
1604 @echo
' versioncheck - Sanity check on version.h usage'
1605 @echo
' includecheck - Check for duplicate included header files'
1606 @echo
' export_report - List the usages of all exported symbols'
1607 @echo
' headerdep - Detect inclusion cycles in headers'
1608 @echo
' coccicheck - Check with Coccinelle'
1609 @echo
' clang-analyzer - Check with clang static analyzer'
1610 @echo
' clang-tidy - Check with clang-tidy'
1613 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1615 @echo
'Kernel selftest:'
1616 @echo
' kselftest - Build and run kernel selftest'
1617 @echo
' Build, install, and boot kernel before'
1618 @echo
' running kselftest on it'
1619 @echo
' Run as root for full coverage'
1620 @echo
' kselftest-all - Build kernel selftest'
1621 @echo
' kselftest-install - Build and install kernel selftest'
1622 @echo
' kselftest-clean - Remove all generated kselftest files'
1623 @echo
' kselftest-merge - Merge all the config dependencies of'
1624 @echo
' kselftest to existing .config.'
1627 echo
'Devicetree:'; \
1628 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1629 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1630 echo
' dt_binding_check - Validate device tree binding documents'; \
1631 echo
' dtbs_check - Validate device tree source files';\
1634 @echo
'Userspace tools targets:'
1635 @echo
' use "make tools/help"'
1636 @echo
' or "cd tools; make help"'
1638 @echo
'Kernel packaging:'
1639 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1641 @echo
'Documentation targets:'
1642 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1644 @echo
'Architecture specific targets ($(SRCARCH)):'
1646 echo
' No architecture specific help defined for $(SRCARCH)')
1649 $(foreach b
, $(boards
), \
1650 printf
" %-27s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1652 @
$(if
$(board-dirs
), \
1653 $(foreach b
, $(board-dirs
), \
1654 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1655 printf
" %-16s - Show all of the above\\n" help-boards
; \
1658 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1659 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1660 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1661 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK'
1662 @echo
' (sparse by default)'
1663 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1664 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1665 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1666 @echo
' 1: warnings which may be relevant and do not occur too often'
1667 @echo
' 2: warnings which occur quite often but may still be relevant'
1668 @echo
' 3: more obscure warnings, can most likely be ignored'
1669 @echo
' e: warnings are being treated as errors'
1670 @echo
' Multiple levels can be combined with W=12 or W=123'
1672 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1673 @echo
'For further info see the ./README file'
1676 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1678 help-boards
: $(help-board-dirs
)
1680 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1682 $(help-board-dirs
): help-
%:
1683 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1684 @
$(if
$(boards-per-dir
), \
1685 $(foreach b
, $(boards-per-dir
), \
1686 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1690 # Documentation targets
1691 # ---------------------------------------------------------------------------
1692 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1693 linkcheckdocs dochelp refcheckdocs
1694 PHONY
+= $(DOC_TARGETS
)
1696 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1699 # ---------------------------------------------------------------------------
1701 PHONY
+= scripts_gdb
1702 scripts_gdb
: prepare0
1703 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1704 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1706 ifdef CONFIG_GDB_SCRIPTS
1710 else # KBUILD_EXTMOD
1713 # External module support.
1714 # When building external modules the kernel used as basis is considered
1715 # read-only, and no consistency checks are made and the make
1716 # system is not used on the basis kernel. If updates are required
1717 # in the basis kernel ordinary make commands (without M=...) must be used.
1719 # We are always building only modules.
1723 build-dirs
:= $(KBUILD_EXTMOD
)
1724 $(MODORDER
): descend
1727 compile_commands.json
: $(extmod_prefix
)compile_commands.json
1728 PHONY
+= compile_commands.json
1730 clean-dirs
:= $(KBUILD_EXTMOD
)
1731 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
$(KBUILD_EXTMOD
)/modules.nsdeps \
1732 $(KBUILD_EXTMOD
)/compile_commands.json
$(KBUILD_EXTMOD
)/.thinlto-cache
1735 # now expand this into a simple variable to reduce the cost of shell evaluations
1736 prepare
: CC_VERSION_TEXT
:= $(CC_VERSION_TEXT
)
1738 @if
[ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1739 echo
>&2 "warning: the compiler differs from the one used to build the kernel"; \
1740 echo
>&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1741 echo
>&2 " You are using: $(CC_VERSION_TEXT)"; \
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
+= modules_prepare
1757 endif # KBUILD_EXTMOD
1759 # ---------------------------------------------------------------------------
1762 PHONY
+= modules modules_install
1764 ifdef CONFIG_MODULES
1766 modules
: modules_check
1767 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1769 PHONY
+= modules_check
1770 modules_check
: $(MODORDER
)
1771 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
$<
1773 quiet_cmd_depmod
= DEPMOD
$(MODLIB
)
1774 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1778 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1781 else # CONFIG_MODULES
1783 # Modules not configured
1784 # ---------------------------------------------------------------------------
1786 modules modules_install
:
1788 @echo
>&2 '*** The present kernel configuration has modules disabled.'
1789 @echo
>&2 '*** To use the module feature, please run "make menuconfig" etc.'
1790 @echo
>&2 '*** to enable CONFIG_MODULES.'
1794 endif # CONFIG_MODULES
1797 # ---------------------------------------------------------------------------
1798 # To build individual files in subdirectories, you can do like this:
1800 # make foo/bar/baz.s
1802 # The supported suffixes for single-target are listed in 'single-targets'
1804 # To build only under specific subdirectories, you can do like this:
1810 # .ko is special because modpost is needed
1811 single-ko
:= $(sort $(filter %.ko
, $(MAKECMDGOALS
)))
1812 single-no-ko
:= $(filter-out $(single-ko
), $(MAKECMDGOALS
)) \
1813 $(foreach x
, o mod
, $(patsubst %.ko
, %.
$x, $(single-ko
)))
1815 $(single-ko
): single_modpost
1817 $(single-no-ko
): descend
1820 ifeq ($(KBUILD_EXTMOD
),)
1821 # For the single build of in-tree modules, use a temporary file to avoid
1822 # the situation of modules_install installing an invalid modules.order.
1823 MODORDER
:= .modules.tmp
1826 PHONY
+= single_modpost
1827 single_modpost
: $(single-no-ko
) modules_prepare
1828 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod_prefix
)$m;) } > $(MODORDER
)
1829 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1833 export KBUILD_SINGLE_TARGETS
:= $(addprefix $(extmod_prefix
), $(single-no-ko
))
1835 # trim unrelated directories
1836 build-dirs
:= $(foreach d
, $(build-dirs
), \
1837 $(if
$(filter $(d
)/%, $(KBUILD_SINGLE_TARGETS
)), $(d
)))
1841 ifndef CONFIG_MODULES
1845 # Handle descending into subdirectories listed in $(build-dirs)
1846 # Preset locale variables to speed up the build process. Limit locale
1847 # tweaks to this spot to avoid wrong language settings when running
1848 # make menuconfig etc.
1849 # Error messages still appears in the original language
1850 PHONY
+= descend
$(build-dirs
)
1851 descend
: $(build-dirs
)
1852 $(build-dirs
): prepare
1853 $(Q
)$(MAKE
) $(build
)=$@ \
1854 single-build
=$(if
$(filter-out $@
/, $(filter $@
/%, $(KBUILD_SINGLE_TARGETS
))),1) \
1855 need-builtin
=1 need-modorder
=1
1857 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
1858 PHONY
+= $(clean-dirs
) clean
1860 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1862 clean: $(clean-dirs
)
1864 @find
$(or
$(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1865 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1867 -o
-name
'*.dtb' -o
-name
'*.dtbo' -o
-name
'*.dtb.S' -o
-name
'*.dt.yaml' \
1868 -o
-name
'*.dwo' -o
-name
'*.lst' \
1869 -o
-name
'*.su' -o
-name
'*.mod' -o
-name
'*.usyms' \
1870 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1871 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1872 -o
-name
'*.asn1.[ch]' \
1873 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1875 -o
-name
'*.c.[012]*.*' \
1878 -o
-name
'*.*.symversions' \
) -type f
-print | xargs
rm -f
1880 # Generate tags for editors
1881 # ---------------------------------------------------------------------------
1882 quiet_cmd_tags
= GEN
$@
1883 cmd_tags
= $(BASH
) $(srctree
)/scripts
/tags.sh
$@
1885 tags TAGS cscope gtags
: FORCE
1888 # Script to generate missing namespace dependencies
1889 # ---------------------------------------------------------------------------
1892 nsdeps
: export KBUILD_NSDEPS
=1
1894 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/nsdeps
1897 # ---------------------------------------------------------------------------
1899 quiet_cmd_gen_compile_commands
= GEN
$@
1900 cmd_gen_compile_commands
= $(PYTHON3
) $< -a
$(AR
) -o
$@
$(filter-out $<, $(real-prereqs
))
1902 $(extmod_prefix
)compile_commands.json
: scripts
/clang-tools
/gen_compile_commands.py \
1903 $(if
$(KBUILD_EXTMOD
),,$(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)) \
1904 $(if
$(CONFIG_MODULES
), $(MODORDER
)) FORCE
1905 $(call if_changed
,gen_compile_commands
)
1907 targets
+= $(extmod_prefix
)compile_commands.json
1909 PHONY
+= clang-tidy clang-analyzer
1911 ifdef CONFIG_CC_IS_CLANG
1912 quiet_cmd_clang_tools
= CHECK
$<
1913 cmd_clang_tools
= $(PYTHON3
) $(srctree
)/scripts
/clang-tools
/run-clang-tools.py
$@
$<
1915 clang-tidy clang-analyzer
: $(extmod_prefix
)compile_commands.json
1916 $(call cmd
,clang_tools
)
1918 clang-tidy clang-analyzer
:
1919 @echo
"$@ requires CC=clang" >&2
1923 # Scripts to check various things for consistency
1924 # ---------------------------------------------------------------------------
1926 PHONY
+= includecheck versioncheck coccicheck export_report
1929 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1930 -name
'*.[hcS]' -type f
-print |
sort \
1931 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1934 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1935 -name
'*.[hcS]' -type f
-print |
sort \
1936 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1939 $(Q
)$(BASH
) $(srctree
)/scripts
/$@
1942 $(PERL
) $(srctree
)/scripts
/export_report.pl
1944 PHONY
+= checkstack kernelrelease kernelversion image_name
1946 # UML needs a little special treatment here. It wants to use the host
1947 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1948 # else wants $(ARCH), including people doing cross-builds, which means
1949 # that $(SUBARCH) doesn't work here.
1951 CHECKSTACK_ARCH
:= $(SUBARCH
)
1953 CHECKSTACK_ARCH
:= $(ARCH
)
1956 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1957 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1960 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1963 @echo
$(KERNELVERSION
)
1966 @echo
$(KBUILD_IMAGE
)
1968 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1969 cmd_rmfiles
= rm -rf
$(rm-files
)
1971 # read saved command lines for existing targets
1972 existing-targets
:= $(wildcard $(sort $(targets
)))
1974 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
1976 endif # config-build
1978 endif # need-sub-make
1983 # Declare the contents of the PHONY variable as phony. We keep that
1984 # information in a variable so we can use it in if_changed and friends.