1 # SPDX-License-Identifier: GPL-2.0
6 NAME
= Kleptomaniac Octopus
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 # That's our default target when none is given on the command line
18 # We are using a recursive build, so we need to do a little thinking
19 # to get the ordering right.
21 # Most importantly: sub-Makefiles should only ever modify files in
22 # their own directory. If in some directory we have a dependency on
23 # a file in another dir (which doesn't happen often, but it's often
24 # unavoidable when linking the built-in.a targets which finally
25 # turn into vmlinux), we will call a sub make in that other dir, and
26 # after that we are sure that everything which is in that other dir
29 # The only cases where we need to modify files which have global
30 # effects are thus separated out and done before the recursive
31 # descending is started. They are now explicitly listed as the
34 ifneq ($(sub_make_done
),1)
36 # Do not use make's built-in rules and variables
37 # (this increases performance and avoids hard-to-debug behaviour)
40 # Avoid funny character set dependencies
44 export LC_COLLATE LC_NUMERIC
46 # Avoid interference with shell env settings
50 # ---------------------------------------------------------------------------
52 # Normally, we echo the whole command before executing it. By making
53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
54 # $(quiet) to choose other forms of output instead, e.g.
56 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
57 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
59 # If $(quiet) is empty, the whole command will be printed.
60 # If it is set to "quiet_", only the short version will be printed.
61 # If it is set to "silent_", nothing will be printed at all, since
62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
64 # A simple variant is to prefix commands with $(Q) - that's useful
65 # for commands that shall be hidden in non-verbose mode.
69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
72 # To put more focus on warnings, be less verbose as default
73 # Use 'make V=1' to see the full commands
75 ifeq ("$(origin V)", "command line")
82 ifeq ($(KBUILD_VERBOSE
),1)
90 # If the user is running make -s (silent mode), suppress echoing of
93 ifneq ($(findstring s
,$(filter-out --%,$(MAKEFLAGS
))),)
97 export quiet Q KBUILD_VERBOSE
99 # Kbuild will save output files in the current working directory.
100 # This does not need to match to the root of the kernel source tree.
102 # For example, you can do this:
104 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
106 # If you want to save output files in a different location, there are
107 # two syntaxes to specify it.
110 # Use "make O=dir/to/store/output/files/"
112 # 2) Set KBUILD_OUTPUT
113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
119 # Do we want to change the working directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT
:= $(O
)
124 ifneq ($(KBUILD_OUTPUT
),)
125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
126 # expand a shell special character '~'. We use a somewhat tedious way here.
127 abs_objtree
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) && pwd
)
128 $(if
$(abs_objtree
),, \
129 $(error failed to create output directory
"$(KBUILD_OUTPUT)"))
131 # $(realpath ...) resolves symlinks
132 abs_objtree
:= $(realpath
$(abs_objtree
))
134 abs_objtree
:= $(CURDIR
)
135 endif # ifneq ($(KBUILD_OUTPUT),)
137 ifeq ($(abs_objtree
),$(CURDIR
))
138 # Suppress "Entering directory ..." unless we are changing the work directory.
139 MAKEFLAGS
+= --no-print-directory
144 abs_srctree
:= $(realpath
$(dir $(lastword
$(MAKEFILE_LIST
))))
146 ifneq ($(words $(subst :, ,$(abs_srctree
))), 1)
147 $(error source directory cannot contain spaces or colons
)
150 ifneq ($(abs_srctree
),$(abs_objtree
))
151 # Look for make include files relative to root of kernel src
153 # This does not become effective immediately because MAKEFLAGS is re-parsed
154 # once after the Makefile is read. We need to invoke sub-make.
155 MAKEFLAGS
+= --include-dir
=$(abs_srctree
)
159 ifneq ($(filter 3.
%,$(MAKE_VERSION
)),)
160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
163 # Cancel implicit rules for this Makefile.
164 $(lastword
$(MAKEFILE_LIST
)): ;
167 export abs_srctree abs_objtree
168 export sub_make_done
:= 1
170 ifeq ($(need-sub-make
),1)
172 PHONY
+= $(MAKECMDGOALS
) sub-make
174 $(filter-out _all sub-make
$(lastword
$(MAKEFILE_LIST
)), $(MAKECMDGOALS
)) _all
: sub-make
177 # Invoke a second make in the output directory, passing relevant variables
179 $(Q
)$(MAKE
) -C
$(abs_objtree
) -f
$(abs_srctree
)/Makefile
$(MAKECMDGOALS
)
181 endif # need-sub-make
182 endif # sub_make_done
184 # We process the rest of the Makefile if this is the final invocation of make
185 ifeq ($(need-sub-make
),)
187 # Do not print "Entering directory ...",
188 # but we want to display it when entering to the output directory
189 # so that IDEs/editors are able to understand relative filenames.
190 MAKEFLAGS
+= --no-print-directory
192 # Call a source code checker (by default, "sparse") as part of the
195 # Use 'make C=1' to enable checking of only re-compiled files.
196 # Use 'make C=2' to enable checking of *all* source files, regardless
197 # of whether they are re-compiled or not.
199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
200 # including where to get the "sparse" utility.
202 ifeq ("$(origin C)", "command line")
203 KBUILD_CHECKSRC
= $(C
)
205 ifndef KBUILD_CHECKSRC
209 # Call message checker as part of the C compilation
211 # Use 'make D=1' to enable checking
212 # Use 'make D=2' to create the message catalog
215 ifeq ("$(origin D)", "command line")
216 KBUILD_KMSG_CHECK
= $(D
)
219 ifndef KBUILD_KMSG_CHECK
220 KBUILD_KMSG_CHECK
= 0
223 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
224 # directory of external module to build. Setting M= takes precedence.
225 ifeq ("$(origin M)", "command line")
226 KBUILD_EXTMOD
:= $(M
)
229 export KBUILD_CHECKSRC KBUILD_EXTMOD
231 extmod-prefix
= $(if
$(KBUILD_EXTMOD
),$(KBUILD_EXTMOD
)/)
233 ifeq ($(abs_srctree
),$(abs_objtree
))
234 # building in the source tree
236 building_out_of_srctree
:=
238 ifeq ($(abs_srctree
)/,$(dir $(abs_objtree
)))
239 # building in a subdirectory of the source tree
242 srctree
:= $(abs_srctree
)
244 building_out_of_srctree
:= 1
247 ifneq ($(KBUILD_ABS_SRCTREE
),)
248 srctree
:= $(abs_srctree
)
254 export building_out_of_srctree srctree objtree VPATH
256 # To make sure we do not include .config for any of the *config targets
257 # catch them early, and hand them over to scripts/kconfig/Makefile
258 # It is allowed to specify more targets when calling make, including
259 # mixing *config targets and build targets.
260 # For example 'make oldconfig all'.
261 # Detect when mixed targets is specified, and make a second invocation
262 # of make so .config is not included in this case either (for *config).
264 version_h
:= include/generated
/uapi
/linux
/version.h
265 old_version_h
:= include/linux
/version.h
267 clean-targets
:= %clean mrproper cleandocs
268 no-dot-config-targets
:= $(clean-targets
) \
269 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
270 $(version_h
) headers headers_
% archheaders archscripts \
271 %asm-generic kernelversion
%src-pkg
272 no-sync-config-targets
:= $(no-dot-config-targets
) install %install \
274 single-targets
:= %.a
%.i
%.ko
%.lds
%.ll
%.lst
%.mod
%.o
%.s
%.symtypes
%/
282 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
283 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
288 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
289 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
294 ifneq ($(KBUILD_EXTMOD
),)
298 ifeq ($(KBUILD_EXTMOD
),)
299 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
301 ifneq ($(words $(MAKECMDGOALS
)),1)
307 # We cannot build single targets and the others at the same time
308 ifneq ($(filter $(single-targets
), $(MAKECMDGOALS
)),)
310 ifneq ($(filter-out $(single-targets
), $(MAKECMDGOALS
)),)
315 # For "make -j clean all", "make -j mrproper defconfig all", etc.
316 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
317 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
322 # install and modules_install need also be processed one by one
323 ifneq ($(filter install,$(MAKECMDGOALS
)),)
324 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
330 # ===========================================================================
331 # We're called with mixed targets (*config and build targets).
332 # Handle them one by one.
334 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
336 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
341 for i in
$(MAKECMDGOALS
); do \
342 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
347 include scripts
/Kbuild.
include
349 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
350 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
351 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
352 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
354 include scripts
/subarch.
include
356 # Cross compiling and selecting different set of gcc/bin-utils
357 # ---------------------------------------------------------------------------
359 # When performing cross compilation for other architectures ARCH shall be set
360 # to the target architecture. (See arch/* for the possibilities).
361 # ARCH can be set during invocation of make:
363 # Another way is to have ARCH set in the environment.
364 # The default ARCH is the host where make is executed.
366 # CROSS_COMPILE specify the prefix used for all executables used
367 # during compilation. Only gcc and related bin-utils executables
368 # are prefixed with $(CROSS_COMPILE).
369 # CROSS_COMPILE can be set on the command line
370 # make CROSS_COMPILE=ia64-linux-
371 # Alternatively CROSS_COMPILE can be set in the environment.
372 # Default value for CROSS_COMPILE is not to prefix executables
373 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
376 # Architecture as present in compile.h
377 UTS_MACHINE
:= $(ARCH
)
380 # Additional ARCH settings for x86
384 ifeq ($(ARCH
),x86_64
)
388 # Additional ARCH settings for sparc
389 ifeq ($(ARCH
),sparc32
)
392 ifeq ($(ARCH
),sparc64
)
396 # Additional ARCH settings for sh
401 KCONFIG_CONFIG ?
= .config
402 export KCONFIG_CONFIG
404 # SHELL used by kbuild
407 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
408 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
409 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
413 KBUILD_HOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2 \
414 -fomit-frame-pointer
-std
=gnu89
$(HOST_LFS_CFLAGS
) \
416 KBUILD_HOSTCXXFLAGS
:= -O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
417 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
418 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
420 # Make variables (CC, etc...)
421 AS
= $(CROSS_COMPILE
)as
422 LD
= $(CROSS_COMPILE
)ld
423 CC
= $(CROSS_COMPILE
)gcc
425 AR
= $(CROSS_COMPILE
)ar
426 NM
= $(CROSS_COMPILE
)nm
427 STRIP
= $(CROSS_COMPILE
)strip
428 OBJCOPY
= $(CROSS_COMPILE
)objcopy
429 OBJDUMP
= $(CROSS_COMPILE
)objdump
430 OBJSIZE
= $(CROSS_COMPILE
)size
435 INSTALLKERNEL
:= installkernel
436 DEPMOD
= /sbin
/depmod
444 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
445 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
446 KMSG_CHECK
= $(srctree
)/scripts
/kmsg-doc
455 # Prefer linux-backports-modules
456 ifneq ($(KBUILD_SRC
),)
457 ifneq ($(shell if
test -e
$(KBUILD_OUTPUT
)/ubuntu-build
; then echo yes
; fi
),yes
)
458 UBUNTUINCLUDE
:= -I
/usr
/src
/linux-headers-lbm-
$(KERNELRELEASE
)
462 # Use USERINCLUDE when you must reference the UAPI directories only.
464 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
465 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
466 -I
$(srctree
)/include/uapi \
467 -I
$(objtree
)/include/generated
/uapi \
468 -include $(srctree
)/include/linux
/kconfig.h
470 # Use LINUXINCLUDE when you must reference the include/ directory.
471 # Needed to be compatible with the O= option
474 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
475 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
476 $(if
$(building_out_of_srctree
),-I
$(srctree
)/include) \
477 -I
$(objtree
)/include \
480 # UBUNTU: Include our third party driver stuff too
481 LINUXINCLUDE
+= -Iubuntu
/include $(if
$(KBUILD_SRC
),-I
$(srctree
)/ubuntu
/include)
483 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
484 KBUILD_CFLAGS
:= -Wall
-Wundef
-Werror
=strict-prototypes
-Wno-trigraphs \
485 -fno-strict-aliasing
-fno-common
-fshort-wchar
-fno-PIE \
486 -Werror
=implicit-function-declaration
-Werror
=implicit-int \
487 -Wno-format-security \
489 KBUILD_CPPFLAGS
:= -D__KERNEL__
490 KBUILD_AFLAGS_KERNEL
:=
491 KBUILD_CFLAGS_KERNEL
:=
492 KBUILD_AFLAGS_MODULE
:= -DMODULE
493 KBUILD_CFLAGS_MODULE
:= -DMODULE
494 KBUILD_LDFLAGS_MODULE
:=
495 export KBUILD_LDS_MODULE
:= $(srctree
)/scripts
/module-common.lds
497 GCC_PLUGINS_CFLAGS
:=
500 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
501 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
502 export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
503 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
505 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
506 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
507 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
508 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
509 export KBUILD_KMSG_CHECK KMSG_CHECK
510 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
511 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
513 # Files to ignore in find ... statements
515 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
516 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
518 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
519 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
521 # ===========================================================================
522 # Rules shared between *config targets and build targets
524 # Basic helpers built in scripts/basic/
525 PHONY
+= scripts_basic
527 $(Q
)$(MAKE
) $(build
)=scripts
/basic
528 $(Q
)rm -f .tmp_quiet_recordmcount
530 PHONY
+= outputmakefile
531 # Before starting out-of-tree build, make sure the source tree is clean.
532 # outputmakefile generates a Makefile in the output directory, if using a
533 # separate output directory. This allows convenient use of make in the
535 # At the same time when output Makefile generated, generate .gitignore to
536 # ignore whole output directory
538 ifdef building_out_of_srctree
539 $(Q
)if
[ -f
$(srctree
)/.config
-o \
540 -d
$(srctree
)/include/config
-o \
541 -d
$(srctree
)/arch
/$(SRCARCH
)/include/generated
]; then \
543 echo
>&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
544 echo
>&2 "*** in $(abs_srctree)";\
548 $(Q
)ln
-fsn
$(srctree
) source
549 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile
$(srctree
)
550 $(Q
)test -e .gitignore || \
551 { echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
554 ifneq ($(shell $(CC
) --version
2>&1 | head
-n
1 | grep clang
),)
555 ifneq ($(CROSS_COMPILE
),)
556 CLANG_FLAGS
+= --target
=$(notdir $(CROSS_COMPILE
:%-=%))
557 GCC_TOOLCHAIN_DIR
:= $(dir $(shell which
$(CROSS_COMPILE
)elfedit
))
558 CLANG_FLAGS
+= --prefix=$(GCC_TOOLCHAIN_DIR
)
559 GCC_TOOLCHAIN
:= $(realpath
$(GCC_TOOLCHAIN_DIR
)/..
)
561 ifneq ($(GCC_TOOLCHAIN
),)
562 CLANG_FLAGS
+= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
564 ifeq ($(shell $(AS
) --version
2>&1 | head
-n
1 | grep clang
),)
565 CLANG_FLAGS
+= -no-integrated-as
567 CLANG_FLAGS
+= -Werror
=unknown-warning-option
568 KBUILD_CFLAGS
+= $(CLANG_FLAGS
)
569 KBUILD_AFLAGS
+= $(CLANG_FLAGS
)
573 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
574 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
575 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
576 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
577 CC_VERSION_TEXT
= $(shell $(CC
) --version
2>/dev
/null | head
-n
1)
580 # ===========================================================================
581 # *config targets only - make sure prerequisites are updated, and descend
582 # in scripts/kconfig to make the *config target
584 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
585 # KBUILD_DEFCONFIG may point out an alternative default configuration
586 # used for 'make defconfig'
587 include arch
/$(SRCARCH
)/Makefile
588 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
590 config
: outputmakefile scripts_basic FORCE
591 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
593 %config
: outputmakefile scripts_basic FORCE
594 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
597 # ===========================================================================
598 # Build targets only - this includes vmlinux, arch specific targets, clean
599 # targets and others. In general all targets except *config targets.
601 # If building an external module we do not care about the all: rule
602 # but instead _all depend on modules
604 ifeq ($(KBUILD_EXTMOD
),)
610 # Decide whether to build built-in, modular, or both.
611 # Normally, just do built-in.
616 # If we have only "make modules", don't compile built-in objects.
617 # When we're building modules with modversions, we need to consider
618 # the built-in objects during the descend as well, in order to
619 # make sure the checksums are up to date before we record them.
621 ifeq ($(MAKECMDGOALS
),modules
)
622 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
625 # If we have "make <whatever> modules", compile modules
626 # in addition to whatever we do anyway.
627 # Just "make" or "make all" shall build modules as well
629 ifneq ($(filter all _all modules nsdeps
,$(MAKECMDGOALS
)),)
633 ifeq ($(MAKECMDGOALS
),)
637 export KBUILD_MODULES KBUILD_BUILTIN
640 include include/config
/auto.conf
643 ifeq ($(KBUILD_EXTMOD
),)
644 # Objects we will link into vmlinux / subdirs we need to visit
646 drivers-y
:= drivers
/ sound
/ ubuntu
/
647 drivers-
$(CONFIG_SAMPLES
) += samples
/
648 drivers-
$(CONFIG_KERNEL_HEADER_TEST
) += include/
653 endif # KBUILD_EXTMOD
655 # The all: target is the default when no target is given on the
657 # This allow a user to issue only 'make' to build a kernel including modules
658 # Defaults to vmlinux, but the arch makefile usually adds further targets
661 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage \
662 $(call cc-option
,-fno-tree-loop-im
) \
663 $(call cc-disable-warning
,maybe-uninitialized
,)
666 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
667 ifdef CONFIG_FUNCTION_TRACER
668 CC_FLAGS_FTRACE
:= -pg
671 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
672 RETPOLINE_VDSO_CFLAGS_GCC
:= -mindirect-branch
=thunk-inline
-mindirect-branch-register
673 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
674 RETPOLINE_VDSO_CFLAGS_CLANG
:= -mretpoline
675 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
676 RETPOLINE_VDSO_CFLAGS
:= $(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_CLANG
)))
677 export RETPOLINE_CFLAGS
678 export RETPOLINE_VDSO_CFLAGS
680 include arch
/$(SRCARCH
)/Makefile
683 ifdef may-sync-config
684 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
685 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
686 # because some architectures define CROSS_COMPILE there.
687 include include/config
/auto.conf.cmd
691 @echo
>&2 '*** Configuration file "$@" not found!'
693 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
694 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
698 # The actual configuration files used during the build are stored in
699 # include/generated/ and include/config/. Update them if .config is newer than
700 # include/config/auto.conf (which mirrors .config).
702 # This exploits the 'multi-target pattern rule' trick.
703 # The syncconfig should be executed only once to make all the targets.
704 %/auto.conf
%/auto.conf.cmd
%/tristate.conf
: $(KCONFIG_CONFIG
)
705 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
706 else # !may-sync-config
707 # External modules and some install targets need include/generated/autoconf.h
708 # and include/config/auto.conf but do not care if they are up-to-date.
709 # Use auto.conf to trigger the test
710 PHONY
+= include/config
/auto.conf
712 include/config
/auto.conf
:
713 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
715 echo
>&2 " ERROR: Kernel configuration is invalid."; \
716 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
717 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
721 endif # may-sync-config
724 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
725 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
726 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
727 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
728 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
730 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
732 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
734 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
738 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
739 KBUILD_CFLAGS
+= -Wno-maybe-uninitialized
742 # Tell gcc to never replace conditional load with a non-conditional one
743 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
745 include scripts
/Makefile.kcov
746 include scripts
/Makefile.gcc-plugins
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
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
762 stackp-flags-
$(CONFIG_CC_HAS_STACKPROTECTOR_NONE
) := -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 # Quiet clang warning: comparison of unsigned expression < 0 is always false
773 KBUILD_CFLAGS
+= -Wno-tautological-compare
774 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
775 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
776 # See modpost pattern 2
777 KBUILD_CFLAGS
+= -mno-global-merge
780 # These warnings generated too much noise in a regular build.
781 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
782 KBUILD_CFLAGS
+= -Wno-unused-but-set-variable
784 # Warn about unmarked fall-throughs in switch statement.
785 # Disabled for clang while comment to attribute conversion happens and
786 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
787 KBUILD_CFLAGS
+= $(call cc-option
,-Wimplicit-fallthrough
,)
790 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
791 ifdef CONFIG_FRAME_POINTER
792 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
794 # Some targets (ARM with Thumb2, for example), can't be built with frame
795 # pointers. For those, we don't have FUNCTION_TRACER automatically
796 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
797 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
798 # -fomit-frame-pointer with FUNCTION_TRACER.
799 ifndef CONFIG_FUNCTION_TRACER
800 KBUILD_CFLAGS
+= -fomit-frame-pointer
804 # Initialize all stack variables with a pattern, if desired.
805 ifdef CONFIG_INIT_STACK_ALL
806 KBUILD_CFLAGS
+= -ftrivial-auto-var-init
=pattern
809 DEBUG_CFLAGS
:= $(call cc-option
, -fno-var-tracking-assignments
)
811 ifdef CONFIG_DEBUG_INFO
812 ifdef CONFIG_DEBUG_INFO_SPLIT
813 DEBUG_CFLAGS
+= -gsplit-dwarf
817 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
819 ifdef CONFIG_DEBUG_INFO_DWARF4
820 DEBUG_CFLAGS
+= -gdwarf-4
823 ifdef CONFIG_DEBUG_INFO_REDUCED
824 DEBUG_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
825 $(call cc-option
,-fno-var-tracking
)
828 KBUILD_CFLAGS
+= $(DEBUG_CFLAGS
)
831 ifdef CONFIG_FUNCTION_TRACER
832 ifdef CONFIG_FTRACE_MCOUNT_RECORD
833 # gcc 5 supports generating the mcount tables directly
834 ifeq ($(call cc-option-yn
,-mrecord-mcount
),y
)
835 CC_FLAGS_FTRACE
+= -mrecord-mcount
836 export CC_USING_RECORD_MCOUNT
:= 1
838 ifdef CONFIG_HAVE_NOP_MCOUNT
839 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
840 CC_FLAGS_FTRACE
+= -mnop-mcount
841 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
845 ifdef CONFIG_HAVE_FENTRY
846 ifeq ($(call cc-option-yn
, -mfentry
),y
)
847 CC_FLAGS_FTRACE
+= -mfentry
848 CC_FLAGS_USING
+= -DCC_USING_FENTRY
851 export CC_FLAGS_FTRACE
852 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
853 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
854 ifdef CONFIG_DYNAMIC_FTRACE
855 ifdef CONFIG_HAVE_C_RECORDMCOUNT
856 BUILD_C_RECORDMCOUNT
:= y
857 export BUILD_C_RECORDMCOUNT
862 # We trigger additional mismatches with less inlining
863 ifdef CONFIG_DEBUG_SECTION_MISMATCH
864 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
867 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
868 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
869 LDFLAGS_vmlinux
+= --gc-sections
872 ifdef CONFIG_LIVEPATCH
873 KBUILD_CFLAGS
+= $(call cc-option
, -flive-patching
=inline-clone
)
876 # arch Makefile may override CC so keep this after arch Makefile is included
877 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
879 # warn about C99 declaration after statement
880 KBUILD_CFLAGS
+= -Wdeclaration-after-statement
882 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
883 KBUILD_CFLAGS
+= -Wvla
885 # disable pointer signed / unsigned warnings in gcc 4.0
886 KBUILD_CFLAGS
+= -Wno-pointer-sign
888 # disable stringop warnings in gcc 8+
889 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
891 # disable invalid "can't wrap" optimizations for signed / pointers
892 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
894 # clang sets -fmerge-all-constants by default as optimization, but this
895 # is non-conforming behavior for C and in fact breaks the kernel, so we
896 # need to disable it here generally.
897 KBUILD_CFLAGS
+= $(call cc-option
,-fno-merge-all-constants
)
899 # for gcc -fno-merge-all-constants disables everything, but it is fine
900 # to have actual conforming behavior enabled.
901 KBUILD_CFLAGS
+= $(call cc-option
,-fmerge-constants
)
903 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
904 KBUILD_CFLAGS
+= $(call cc-option
,-fno-stack-check
,)
906 # conserve stack if available
907 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
909 # Prohibit date/time macros, which would make the build non-deterministic
910 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
912 # enforce correct pointer usage
913 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
915 # Require designated initializers for all marked structures
916 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
918 # change __FILE__ to the relative path from the srctree
919 KBUILD_CFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
921 # ensure -fcf-protection is disabled when using retpoline as it is
922 # incompatible with -mindirect-branch=thunk-extern
923 ifdef CONFIG_RETPOLINE
924 KBUILD_CFLAGS
+= $(call cc-option
,-fcf-protection
=none
)
927 include scripts
/Makefile.kasan
928 include scripts
/Makefile.extrawarn
929 include scripts
/Makefile.ubsan
931 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
932 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
933 KBUILD_AFLAGS
+= $(KAFLAGS
)
934 KBUILD_CFLAGS
+= $(KCFLAGS
)
936 KBUILD_LDFLAGS_MODULE
+= --build-id
937 LDFLAGS_vmlinux
+= --build-id
939 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
940 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
943 ifeq ($(CONFIG_RELR
),y
)
944 LDFLAGS_vmlinux
+= --pack-dyn-relocs
=relr
947 # make the checker run with the right architecture
948 CHECKFLAGS
+= --arch
=$(ARCH
)
950 # insure the checker run with the right endianness
951 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
953 # the checker needs the correct machine size
954 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
956 # Default kernel image to build when no specific target is given.
957 # KBUILD_IMAGE may be overruled on the command line or
958 # set in the environment
959 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
961 export KBUILD_IMAGE ?
= vmlinux
964 # INSTALL_PATH specifies where to place the updated kernel and system map
965 # images. Default is /boot, but you can set it to other values
966 export INSTALL_PATH ?
= /boot
969 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
970 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
971 # an argument if needed. Otherwise it defaults to the kernel install path
973 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
976 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
977 # relocations required by build roots. This is not defined in the
978 # makefile but the argument can be passed to make if needed.
981 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
985 # INSTALL_MOD_STRIP, if defined, will cause modules to be
986 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
987 # the default option --strip-debug will be used. Otherwise,
988 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
990 ifdef INSTALL_MOD_STRIP
991 ifeq ($(INSTALL_MOD_STRIP
),1)
992 mod_strip_cmd
= $(STRIP
) --strip-debug
994 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
995 endif # INSTALL_MOD_STRIP=1
998 endif # INSTALL_MOD_STRIP
1001 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1002 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1003 # or CONFIG_MODULE_COMPRESS_XZ.
1005 mod_compress_cmd
= true
1006 ifdef CONFIG_MODULE_COMPRESS
1007 ifdef CONFIG_MODULE_COMPRESS_GZIP
1008 mod_compress_cmd
= gzip
-n
-f
1009 endif # CONFIG_MODULE_COMPRESS_GZIP
1010 ifdef CONFIG_MODULE_COMPRESS_XZ
1011 mod_compress_cmd
= xz
-f
1012 endif # CONFIG_MODULE_COMPRESS_XZ
1013 endif # CONFIG_MODULE_COMPRESS
1014 export mod_compress_cmd
1016 ifdef CONFIG_MODULE_SIG_ALL
1017 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
1019 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
1025 HOST_LIBELF_LIBS
= $(shell pkg-config libelf
--libs
2>/dev
/null || echo
-lelf
)
1027 ifdef CONFIG_STACK_VALIDATION
1028 has_libelf
:= $(call try-run
,\
1029 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
$(HOST_LIBELF_LIBS
) -,1,0)
1030 ifeq ($(has_libelf
),1)
1031 objtool_target
:= tools
/objtool FORCE
1033 SKIP_STACK_VALIDATION
:= 1
1034 export SKIP_STACK_VALIDATION
1040 export MODORDER
:= $(extmod-prefix
)modules.order
1042 ifeq ($(KBUILD_EXTMOD
),)
1043 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
1045 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
1046 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
1047 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
1049 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) Documentation \
1050 $(patsubst %/,%,$(filter %/, $(init-
) $(core-
) \
1051 $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
1053 build-dirs
:= $(vmlinux-dirs
)
1054 clean-dirs
:= $(vmlinux-alldirs
)
1056 init-y
:= $(patsubst %/, %/built-in.a
, $(init-y
))
1057 core-y
:= $(patsubst %/, %/built-in.a
, $(core-y
))
1058 drivers-y
:= $(patsubst %/, %/built-in.a
, $(drivers-y
))
1059 net-y
:= $(patsubst %/, %/built-in.a
, $(net-y
))
1060 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
1061 libs-y2
:= $(patsubst %/, %/built-in.a
, $(filter-out %.a
, $(libs-y
)))
1062 virt-y
:= $(patsubst %/, %/built-in.a
, $(virt-y
))
1064 # Externally visible symbols (used by link-vmlinux.sh)
1065 export KBUILD_VMLINUX_OBJS
:= $(head-y
) $(init-y
) $(core-y
) $(libs-y2
) \
1066 $(drivers-y
) $(net-y
) $(virt-y
)
1067 export KBUILD_VMLINUX_LIBS
:= $(libs-y1
)
1068 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1069 export LDFLAGS_vmlinux
1070 # used by scripts/Makefile.package
1071 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) LICENSES arch
include scripts tools
)
1073 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)
1075 # Recurse until adjust_autoksyms.sh is satisfied
1076 PHONY
+= autoksyms_recursive
1077 ifdef CONFIG_TRIM_UNUSED_KSYMS
1078 autoksyms_recursive
: descend modules.order
1079 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1080 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1083 # For the kernel to actually contain only the needed exported symbols,
1084 # we have to build modules as well to determine what those symbols are.
1085 # (this can be evaluated only once include/config/auto.conf has been included)
1086 ifdef CONFIG_TRIM_UNUSED_KSYMS
1090 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1093 $(Q
)mkdir
-p
$(dir $@
)
1096 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1098 # Final link of vmlinux with optional arch pass after final link
1099 cmd_link-vmlinux
= \
1100 $(CONFIG_SHELL
) $< $(LD
) $(KBUILD_LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
1101 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1103 vmlinux
: scripts
/link-vmlinux.sh autoksyms_recursive
$(vmlinux-deps
) FORCE
1104 +$(call if_changed
,link-vmlinux
)
1108 # The actual objects are generated when descending,
1109 # make sure no implicit rule kicks in
1110 $(sort $(vmlinux-deps
)): descend
;
1112 filechk_kernel.release
= \
1113 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1115 # Store (new) KERNELRELEASE string in include/config/kernel.release
1116 include/config
/kernel.release
: FORCE
1117 $(call filechk
,kernel.release
)
1119 # Additional helpers built in scripts/
1120 # Carefully list dependencies so we do not try to build scripts twice
1123 scripts
: scripts_basic scripts_dtc
1124 $(Q
)$(MAKE
) $(build
)=$(@
)
1126 # Things we need to do before we recursively start building the kernel
1127 # or the modules are listed in "prepare".
1128 # A multi level approach is used. prepareN is processed before prepareN-1.
1129 # archprepare is used in arch Makefiles and when processed asm symlink,
1130 # version.h and scripts_basic is processed / created.
1132 PHONY
+= prepare archprepare
1134 archprepare
: outputmakefile archheaders archscripts scripts
include/config
/kernel.release \
1135 asm-generic
$(version_h
) $(autoksyms_h
) include/generated
/utsrelease.h
1137 prepare0
: archprepare
1138 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1139 $(Q
)$(MAKE
) $(build
)=.
1141 # All the preparing..
1142 prepare
: prepare0 prepare-objtool
1144 # Support for using generic headers in asm-generic
1145 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1147 PHONY
+= asm-generic uapi-asm-generic
1148 asm-generic
: uapi-asm-generic
1149 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1150 generic
=include/asm-generic
1152 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1153 generic
=include/uapi
/asm-generic
1155 PHONY
+= prepare-objtool
1156 prepare-objtool
: $(objtool_target
)
1157 ifeq ($(SKIP_STACK_VALIDATION
),1)
1158 ifdef CONFIG_UNWINDER_ORC
1159 @echo
"error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1162 @echo
"warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1166 # Generate some files
1167 # ---------------------------------------------------------------------------
1169 # KERNELRELEASE can change from a few different places, meaning version.h
1170 # needs to be updated, so this check is forced on all builds
1173 define filechk_utsrelease.h
1174 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1175 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1178 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1181 define filechk_version.h
1182 echo \
#define LINUX_VERSION_CODE $(shell \
1183 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1184 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1188 $(call filechk
,version.h
)
1189 $(Q
)rm -f
$(old_version_h
)
1191 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1192 $(call filechk
,utsrelease.h
)
1196 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1197 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1199 # ---------------------------------------------------------------------------
1202 #Default location for installed headers
1203 export INSTALL_HDR_PATH
= $(objtree
)/usr
1205 quiet_cmd_headers_install
= INSTALL
$(INSTALL_HDR_PATH
)/include
1206 cmd_headers_install
= \
1207 mkdir
-p
$(INSTALL_HDR_PATH
); \
1208 rsync
-mrl
--include='*/' --include='*\.h' --exclude
='*' \
1209 usr
/include $(INSTALL_HDR_PATH
)
1211 PHONY
+= headers_install
1212 headers_install
: headers
1213 $(call cmd
,headers_install
)
1215 PHONY
+= archheaders archscripts
1217 hdr-inst
:= -f
$(srctree
)/scripts
/Makefile.headersinst obj
1220 headers
: $(version_h
) scripts_unifdef uapi-asm-generic archheaders archscripts
1221 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1222 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1223 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1224 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
1225 $(Q
)$(MAKE
) $(hdr-inst
)=ubuntu
/include dst
=include oldheaders
=
1227 PHONY
+= headers_check
1228 headers_check
: headers
1229 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi HDRCHECK
=1
1230 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi HDRCHECK
=1
1231 $(Q
)$(MAKE
) $(hdr-inst
)=ubuntu
/include dst
=include oldheaders
= HDRCHECK
=1
1233 ifdef CONFIG_HEADERS_INSTALL
1237 ifdef CONFIG_HEADERS_CHECK
1241 PHONY
+= scripts_unifdef
1242 scripts_unifdef
: scripts_basic
1243 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1245 # ---------------------------------------------------------------------------
1250 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1253 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
$*
1255 PHONY
+= kselftest-merge
1257 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1258 $(Q
)find
$(srctree
)/tools
/testing
/selftests
-name config | \
1259 xargs
$(srctree
)/scripts
/kconfig
/merge_config.sh
-m
$(objtree
)/.config
1260 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1262 # ---------------------------------------------------------------------------
1265 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1266 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1271 %.dtb
: include/config
/kernel.release scripts_dtc
1272 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1274 PHONY
+= dtbs dtbs_install dt_binding_check
1275 dtbs dtbs_check
: include/config
/kernel.release scripts_dtc
1276 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1278 dtbs_check
: export CHECK_DTBS
=1
1279 dtbs_check
: dt_binding_check
1282 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
)
1284 ifdef CONFIG_OF_EARLY_FLATTREE
1290 PHONY
+= scripts_dtc
1291 scripts_dtc
: scripts_basic
1292 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1294 dt_binding_check
: scripts_dtc
1295 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1297 # ---------------------------------------------------------------------------
1300 ifdef CONFIG_MODULES
1302 # By default, build modules as well
1308 # A module can be listed more than once in obj-m resulting in
1309 # duplicate lines in modules.order files. Those are removed
1310 # using awk while concatenating to the final file.
1313 modules
: $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.order modules.builtin
1314 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1315 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/modules-check.sh
1317 modules.order
: descend
1318 $(Q
)$(AWK
) '!x[$$0]++' $(addsuffix /$@
, $(build-dirs
)) > $@
1320 modbuiltin-dirs
:= $(addprefix _modbuiltin_
, $(build-dirs
))
1322 modules.builtin
: $(modbuiltin-dirs
)
1323 $(Q
)$(AWK
) '!x[$$0]++' $(addsuffix /$@
, $(build-dirs
)) > $@
1325 PHONY
+= $(modbuiltin-dirs
)
1326 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1327 # here to make it self-healing in case somebody accidentally removes it.
1328 $(modbuiltin-dirs
): include/config
/tristate.conf
1329 $(Q
)$(MAKE
) $(modbuiltin
)=$(patsubst _modbuiltin_
%,%,$@
)
1331 # Target to prepare building external modules
1332 PHONY
+= modules_prepare
1333 modules_prepare
: prepare
1335 # Target to install modules
1336 PHONY
+= modules_install
1337 modules_install
: _modinst_ _modinst_post
1341 @
rm -rf
$(MODLIB
)/kernel
1342 @
rm -f
$(MODLIB
)/source
1343 @mkdir
-p
$(MODLIB
)/kernel
1344 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1345 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1346 rm -f
$(MODLIB
)/build
; \
1347 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1349 @sed
's:^:kernel/:' modules.order
> $(MODLIB
)/modules.order
1350 @sed
's:^:kernel/:' modules.builtin
> $(MODLIB
)/modules.builtin
1351 @cp
-f
$(objtree
)/modules.builtin.modinfo
$(MODLIB
)/
1352 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1354 # This depmod is only for convenience to give the initial
1355 # boot a modules.dep even before / is mounted read-write. However the
1356 # boot script depmod is the master version.
1357 PHONY
+= _modinst_post
1358 _modinst_post
: _modinst_
1361 ifeq ($(CONFIG_MODULE_SIG
), y
)
1362 PHONY
+= modules_sign
1364 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1367 else # CONFIG_MODULES
1369 # Modules not configured
1370 # ---------------------------------------------------------------------------
1372 PHONY
+= modules modules_install
1373 modules modules_install
:
1375 @echo
>&2 "The present kernel configuration has modules disabled."
1376 @echo
>&2 "Type 'make config' and enable loadable module support."
1377 @echo
>&2 "Then build a kernel with module support enabled."
1381 endif # CONFIG_MODULES
1384 # Cleaning is done on three levels.
1385 # make clean Delete most generated files
1386 # Leave enough to build external modules
1387 # make mrproper Delete the current configuration, and all generated files
1388 # make distclean Remove editor backup files, patch leftover files and the like
1390 # Directories & files removed with 'make clean'
1391 CLEAN_DIRS
+= include/ksym
1392 CLEAN_FILES
+= modules.builtin.modinfo
1394 # Directories & files removed with 'make mrproper'
1395 MRPROPER_DIRS
+= include/config
include/generated \
1396 arch
/$(SRCARCH
)/include/generated .tmp_objdiff \
1397 debian
/ snap
/ tar-install
/
1398 MRPROPER_FILES
+= .config .config.old .version \
1400 signing_key.pem signing_key.priv signing_key.x509 \
1401 x509.genkey extra_certificates signing_key.x509.keyid \
1402 signing_key.x509.signer vmlinux-gdb.py \
1405 # Directories & files removed with 'make distclean'
1407 DISTCLEAN_FILES
+= tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS
1409 # clean - Delete most, but leave enough to build external modules
1411 clean: rm-dirs
:= $(CLEAN_DIRS
)
1412 clean: rm-files
:= $(CLEAN_FILES
)
1414 PHONY
+= archclean vmlinuxclean
1417 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1418 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1420 clean: archclean vmlinuxclean
1422 # mrproper - Delete all generated files, including .config
1424 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1425 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1426 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1428 PHONY
+= $(mrproper-dirs
) mrproper
1430 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1432 mrproper
: clean $(mrproper-dirs
)
1438 distclean: rm-dirs
:= $(wildcard $(DISTCLEAN_DIRS
))
1439 distclean: rm-files
:= $(wildcard $(DISTCLEAN_FILES
))
1446 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1447 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1448 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1449 -o
-name
'core' \
) \
1450 -type f
-print | xargs
rm -f
1453 # Packaging of the kernel to various formats
1454 # ---------------------------------------------------------------------------
1457 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1458 %pkg
: include/config
/kernel.release FORCE
1459 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package
$@
1461 # Brief documentation of the typical targets used
1462 # ---------------------------------------------------------------------------
1464 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1465 boards
:= $(sort $(notdir $(boards
)))
1466 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1467 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1471 @echo
'Cleaning targets:'
1472 @echo
' clean - Remove most generated files but keep the config and'
1473 @echo
' enough build support to build external modules'
1474 @echo
' mrproper - Remove all generated files + config + various backup files'
1475 @echo
' distclean - mrproper + remove editor backup and patch files'
1477 @echo
'Configuration targets:'
1478 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1480 @echo
'Other generic targets:'
1481 @echo
' all - Build all targets marked with [*]'
1482 @echo
'* vmlinux - Build the bare kernel'
1483 @echo
'* modules - Build all modules'
1484 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1485 @echo
' dir/ - Build all files in dir and below'
1486 @echo
' dir/file.[ois] - Build specified target only'
1487 @echo
' dir/file.ll - Build the LLVM assembly file'
1488 @echo
' (requires compiler support for LLVM assembly generation)'
1489 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1490 @echo
' (requires a recent binutils and recent build (System.map))'
1491 @echo
' dir/file.ko - Build module including final link'
1492 @echo
' modules_prepare - Set up for building external modules'
1493 @echo
' tags/TAGS - Generate tags file for editors'
1494 @echo
' cscope - Generate cscope index'
1495 @echo
' gtags - Generate GNU GLOBAL index'
1496 @echo
' kernelrelease - Output the release version string (use with make -s)'
1497 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1498 @echo
' image_name - Output the image name (use with make -s)'
1499 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1500 echo
' (default: $(INSTALL_HDR_PATH))'; \
1502 @echo
'Static analysers:'
1503 @echo
' checkstack - Generate a list of stack hogs'
1504 @echo
' namespacecheck - Name space analysis on compiled kernel'
1505 @echo
' versioncheck - Sanity check on version.h usage'
1506 @echo
' includecheck - Check for duplicate included header files'
1507 @echo
' export_report - List the usages of all exported symbols'
1508 @echo
' headers_check - Sanity check on exported headers'
1509 @echo
' headerdep - Detect inclusion cycles in headers'
1510 @echo
' coccicheck - Check with Coccinelle'
1513 @echo
' nsdeps - Generate missing symbol namespace dependencies'
1515 @echo
'Kernel selftest:'
1516 @echo
' kselftest - Build and run kernel selftest (run as root)'
1517 @echo
' Build, install, and boot kernel before'
1518 @echo
' running kselftest on it'
1519 @echo
' kselftest-clean - Remove all generated kselftest files'
1520 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1524 echo
'Devicetree:'; \
1525 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1526 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1527 echo
' dt_binding_check - Validate device tree binding documents'; \
1528 echo
' dtbs_check - Validate device tree source files';\
1531 @echo
'Userspace tools targets:'
1532 @echo
' use "make tools/help"'
1533 @echo
' or "cd tools; make help"'
1535 @echo
'Kernel packaging:'
1536 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.package help
1538 @echo
'Documentation targets:'
1539 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1541 @echo
'Architecture specific targets ($(SRCARCH)):'
1542 @
$(if
$(archhelp
),$(archhelp
),\
1543 echo
' No architecture specific help defined for $(SRCARCH)')
1546 $(foreach b
, $(boards
), \
1547 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1549 @
$(if
$(board-dirs
), \
1550 $(foreach b
, $(board-dirs
), \
1551 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1552 printf
" %-16s - Show all of the above\\n" help-boards
; \
1555 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1556 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1557 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1558 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1559 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1560 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1561 @echo
' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1562 @echo
' 1: warnings which may be relevant and do not occur too often'
1563 @echo
' 2: warnings which occur quite often but may still be relevant'
1564 @echo
' 3: more obscure warnings, can most likely be ignored'
1565 @echo
' Multiple levels can be combined with W=12 or W=123'
1567 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1568 @echo
'For further info see the ./README file'
1571 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1573 help-boards
: $(help-board-dirs
)
1575 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1577 $(help-board-dirs
): help-
%:
1578 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1579 @
$(if
$(boards-per-dir
), \
1580 $(foreach b
, $(boards-per-dir
), \
1581 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1585 # Documentation targets
1586 # ---------------------------------------------------------------------------
1587 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1588 linkcheckdocs dochelp refcheckdocs
1589 PHONY
+= $(DOC_TARGETS
)
1591 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1594 # ---------------------------------------------------------------------------
1596 PHONY
+= scripts_gdb
1597 scripts_gdb
: prepare0
1598 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1599 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1601 ifdef CONFIG_GDB_SCRIPTS
1605 else # KBUILD_EXTMOD
1608 # External module support.
1609 # When building external modules the kernel used as basis is considered
1610 # read-only, and no consistency checks are made and the make
1611 # system is not used on the basis kernel. If updates are required
1612 # in the basis kernel ordinary make commands (without M=...) must
1615 # The following are the only valid targets when building external
1617 # make M=dir clean Delete all automatically generated files
1618 # make M=dir modules Make all modules in specified dir
1619 # make M=dir Same as 'make M=dir modules'
1620 # make M=dir modules_install
1621 # Install the modules built in the module directory
1622 # Assumes install directory is already created
1624 # We are always building modules
1627 PHONY
+= $(objtree
)/Module.symvers
1628 $(objtree
)/Module.symvers
:
1629 @
test -e
$(objtree
)/Module.symvers ||
( \
1631 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1632 echo
" is missing; modules will have no dependencies and modversions."; \
1635 build-dirs
:= $(KBUILD_EXTMOD
)
1637 modules
: descend
$(objtree
)/Module.symvers
1638 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1640 PHONY
+= modules_install
1641 modules_install
: _emodinst_ _emodinst_post
1643 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1646 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1647 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1649 PHONY
+= _emodinst_post
1650 _emodinst_post
: _emodinst_
1653 clean-dirs
:= $(KBUILD_EXTMOD
)
1654 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1658 @echo
>&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1662 @echo
' Building external modules.'
1663 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1665 @echo
' modules - default target, build the module(s)'
1666 @echo
' modules_install - install the module'
1667 @echo
' clean - remove generated files in module directory only'
1671 endif # KBUILD_EXTMOD
1673 # Handle descending into subdirectories listed in $(build-dirs)
1674 # Preset locale variables to speed up the build process. Limit locale
1675 # tweaks to this spot to avoid wrong language settings when running
1676 # make menuconfig etc.
1677 # Error messages still appears in the original language
1678 PHONY
+= descend
$(build-dirs
)
1679 descend
: $(build-dirs
)
1680 $(build-dirs
): prepare
1681 $(Q
)$(MAKE
) $(build
)=$@ single-build
=$(single-build
) need-builtin
=1 need-modorder
=1
1683 clean-dirs
:= $(addprefix _clean_
, $(clean-dirs
))
1684 PHONY
+= $(clean-dirs
) clean
1686 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1688 clean: $(clean-dirs
)
1691 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1692 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1694 -o
-name
'*.dtb' -o
-name
'*.dtb.S' -o
-name
'*.dt.yaml' \
1695 -o
-name
'*.dwo' -o
-name
'*.lst' \
1696 -o
-name
'*.su' -o
-name
'*.mod' -o
-name
'*.ns_deps' \
1697 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1698 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1699 -o
-name
'*.asn1.[ch]' \
1700 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1701 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1702 -o
-name
'*.c.[012]*.*' \
1704 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1706 # Generate tags for editors
1707 # ---------------------------------------------------------------------------
1708 quiet_cmd_tags
= GEN
$@
1709 cmd_tags
= $(BASH
) $(srctree
)/scripts
/tags.sh
$@
1711 tags TAGS cscope gtags
: FORCE
1714 # Script to generate missing namespace dependencies
1715 # ---------------------------------------------------------------------------
1720 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost nsdeps
1721 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1723 # Scripts to check various things for consistency
1724 # ---------------------------------------------------------------------------
1726 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1729 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1730 -name
'*.[hcS]' -type f
-print |
sort \
1731 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1734 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1735 -name
'*.[hcS]' -type f
-print |
sort \
1736 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1739 $(Q
)$(BASH
) $(srctree
)/scripts
/$@
1742 $(PERL
) $(srctree
)/scripts
/namespace.pl
1745 $(PERL
) $(srctree
)/scripts
/export_report.pl
1747 PHONY
+= checkstack kernelrelease kernelversion image_name
1749 # UML needs a little special treatment here. It wants to use the host
1750 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1751 # else wants $(ARCH), including people doing cross-builds, which means
1752 # that $(SUBARCH) doesn't work here.
1754 CHECKSTACK_ARCH
:= $(SUBARCH
)
1756 CHECKSTACK_ARCH
:= $(ARCH
)
1759 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1760 $(PERL
) $(srctree
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1763 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1766 @echo
$(KERNELVERSION
)
1769 @echo
$(KBUILD_IMAGE
)
1771 # Clear a bunch of variables before executing the submake
1773 ifeq ($(quiet
),silent_
)
1778 $(Q
)mkdir
-p
$(objtree
)/tools
1779 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/
1782 $(Q
)mkdir
-p
$(objtree
)/tools
1783 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(srctree
)/tools
/ $*
1786 # ---------------------------------------------------------------------------
1787 # To build individual files in subdirectories, you can do like this:
1789 # make foo/bar/baz.s
1791 # The supported suffixes for single-target are listed in 'single-targets'
1793 # To build only under specific subdirectories, you can do like this:
1799 single-all
:= $(filter $(single-targets
), $(MAKECMDGOALS
))
1801 # .ko is special because modpost is needed
1802 single-ko
:= $(sort $(filter %.ko
, $(single-all
)))
1803 single-no-ko
:= $(sort $(patsubst %.ko
,%.mod
, $(single-all
)))
1805 $(single-ko
): single_modpost
1807 $(single-no-ko
): descend
1810 ifeq ($(KBUILD_EXTMOD
),)
1811 # For the single build of in-tree modules, use a temporary file to avoid
1812 # the situation of modules_install installing an invalid modules.order.
1813 MODORDER
:= .modules.tmp
1816 PHONY
+= single_modpost
1817 single_modpost
: $(single-no-ko
)
1818 $(Q
){ $(foreach m
, $(single-ko
), echo
$(extmod-prefix
)$m;) } > $(MODORDER
)
1819 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1823 export KBUILD_SINGLE_TARGETS
:= $(addprefix $(extmod-prefix
), $(single-no-ko
))
1825 single-build
= $(if
$(filter-out $@
/, $(single-no-ko
)),1)
1829 # FIXME Should go into a make.lib or something
1830 # ===========================================================================
1832 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1833 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1835 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1836 cmd_rmfiles
= rm -f
$(rm-files
)
1838 # Run depmod only if we have System.map and depmod is executable
1839 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1840 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1843 # read saved command lines for existing targets
1844 existing-targets
:= $(wildcard $(sort $(targets
)))
1846 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
1848 endif # config-targets
1850 endif # need-sub-make
1855 # Declare the contents of the PHONY variable as phony. We keep that
1856 # information in a variable so we can use it in if_changed and friends.