5 NAME
= Blurry Fish Butt
8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
13 # o Do not use make's built-in rules and variables
14 # (this increases performance and avoids hard-to-debug behaviour);
15 # o Look for make include files relative to root of kernel src
16 MAKEFLAGS
+= -rR
--include-dir
=$(CURDIR
)
18 # Avoid funny character set dependencies
22 export LC_COLLATE LC_NUMERIC
24 # Avoid interference with shell env settings
27 # We are using a recursive build, so we need to do a little thinking
28 # to get the ordering right.
30 # Most importantly: sub-Makefiles should only ever modify files in
31 # their own directory. If in some directory we have a dependency on
32 # a file in another dir (which doesn't happen often, but it's often
33 # unavoidable when linking the built-in.o targets which finally
34 # turn into vmlinux), we will call a sub make in that other dir, and
35 # after that we are sure that everything which is in that other dir
38 # The only cases where we need to modify files which have global
39 # effects are thus separated out and done before the recursive
40 # descending is started. They are now explicitly listed as the
44 # ---------------------------------------------------------------------------
46 # Normally, we echo the whole command before executing it. By making
47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
48 # $(quiet) to choose other forms of output instead, e.g.
50 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
53 # If $(quiet) is empty, the whole command will be printed.
54 # If it is set to "quiet_", only the short version will be printed.
55 # If it is set to "silent_", nothing will be printed at all, since
56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
58 # A simple variant is to prefix commands with $(Q) - that's useful
59 # for commands that shall be hidden in non-verbose mode.
63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
66 # To put more focus on warnings, be less verbose as default
67 # Use 'make V=1' to see the full commands
69 ifeq ("$(origin V)", "command line")
76 ifeq ($(KBUILD_VERBOSE
),1)
84 # If the user is running make -s (silent mode), suppress echoing of
87 ifneq ($(filter 4.
%,$(MAKE_VERSION
)),) # make-4
88 ifneq ($(filter %s
,$(firstword x
$(MAKEFLAGS
))),)
92 ifneq ($(filter s
% -s
%,$(MAKEFLAGS
)),)
97 export quiet Q KBUILD_VERBOSE
99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
103 # Use "make O=dir/to/store/output/files/"
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
114 # KBUILD_SRC is set on invocation of make in OBJ directory
115 # KBUILD_SRC is not intended to be used by the regular user (for now)
116 ifeq ($(KBUILD_SRC
),)
118 # OK, Make called in directory where kernel src resides
119 # Do we want to locate output files in a separate directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT
:= $(O
)
124 # That's our default target when none is given on the command line
128 # Cancel implicit rules on top Makefile
129 $(CURDIR
)/Makefile Makefile
: ;
131 ifneq ($(words $(subst :, ,$(CURDIR
))), 1)
132 $(error main directory cannot contain spaces nor colons
)
135 ifneq ($(KBUILD_OUTPUT
),)
136 # Invoke a second make in the output directory, passing relevant variables
137 # check that the output directory actually exists
138 saved-output
:= $(KBUILD_OUTPUT
)
139 KBUILD_OUTPUT
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) \
141 $(if
$(KBUILD_OUTPUT
),, \
142 $(error failed to create output directory
"$(saved-output)"))
144 PHONY
+= $(MAKECMDGOALS
) sub-make
146 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
150 $(Q
)$(MAKE
) -C
$(KBUILD_OUTPUT
) KBUILD_SRC
=$(CURDIR
) \
151 -f
$(CURDIR
)/Makefile
$(filter-out _all sub-make
,$(MAKECMDGOALS
))
153 # Leave processing to above invocation of make
155 endif # ifneq ($(KBUILD_OUTPUT),)
156 endif # ifeq ($(KBUILD_SRC),)
158 # We process the rest of the Makefile if this is the final invocation of make
159 ifeq ($(skip-makefile
),)
161 # Do not print "Entering directory ...",
162 # but we want to display it when entering to the output directory
163 # so that IDEs/editors are able to understand relative filenames.
164 MAKEFLAGS
+= --no-print-directory
166 # Call a source code checker (by default, "sparse") as part of the
169 # Use 'make C=1' to enable checking of only re-compiled files.
170 # Use 'make C=2' to enable checking of *all* source files, regardless
171 # of whether they are re-compiled or not.
173 # See the file "Documentation/sparse.txt" for more details, including
174 # where to get the "sparse" utility.
176 ifeq ("$(origin C)", "command line")
177 KBUILD_CHECKSRC
= $(C
)
179 ifndef KBUILD_CHECKSRC
183 # Use make M=dir to specify directory of external module to build
184 # Old syntax make ... SUBDIRS=$PWD is still supported
185 # Setting the environment variable KBUILD_EXTMOD take precedence
187 KBUILD_EXTMOD ?
= $(SUBDIRS
)
190 ifeq ("$(origin M)", "command line")
191 KBUILD_EXTMOD
:= $(M
)
194 # If building an external module we do not care about the all: rule
195 # but instead _all depend on modules
197 ifeq ($(KBUILD_EXTMOD
),)
203 ifeq ($(KBUILD_SRC
),)
204 # building in the source tree
207 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
208 # building in a subdirectory of the source tree
211 srctree
:= $(KBUILD_SRC
)
218 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
220 export srctree objtree VPATH
222 # SUBARCH tells the usermode build what the underlying arch is. That is set
223 # first, and if a usermode build is happening, the "ARCH=um" on the command
224 # line overrides the setting of ARCH below. If a native build is happening,
225 # then ARCH is assigned, getting whatever value it gets normally, and
226 # SUBARCH is subsequently ignored.
228 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
229 -e s
/sun4u
/sparc64
/ \
230 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
231 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
232 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
233 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ )
235 # Cross compiling and selecting different set of gcc/bin-utils
236 # ---------------------------------------------------------------------------
238 # When performing cross compilation for other architectures ARCH shall be set
239 # to the target architecture. (See arch/* for the possibilities).
240 # ARCH can be set during invocation of make:
242 # Another way is to have ARCH set in the environment.
243 # The default ARCH is the host where make is executed.
245 # CROSS_COMPILE specify the prefix used for all executables used
246 # during compilation. Only gcc and related bin-utils executables
247 # are prefixed with $(CROSS_COMPILE).
248 # CROSS_COMPILE can be set on the command line
249 # make CROSS_COMPILE=ia64-linux-
250 # Alternatively CROSS_COMPILE can be set in the environment.
251 # A third alternative is to store a setting in .config so that plain
252 # "make" in the configured kernel build directory always uses that.
253 # Default value for CROSS_COMPILE is not to prefix executables
254 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
256 #CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
258 #CROSS_COMPILE ?= ../PLATFORM/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-
259 CROSS_COMPILE ?
= $(srctree
)/toolchain
/gcc-cfp
/gcc-cfp-jopp-only
/aarch64-linux-android-4.9
/bin
/aarch64-linux-android-
261 # Architecture as present in compile.h
262 UTS_MACHINE
:= $(ARCH
)
265 # Additional ARCH settings for x86
269 ifeq ($(ARCH
),x86_64
)
273 # Additional ARCH settings for sparc
274 ifeq ($(ARCH
),sparc32
)
277 ifeq ($(ARCH
),sparc64
)
281 # Additional ARCH settings for sh
286 # Additional ARCH settings for tile
287 ifeq ($(ARCH
),tilepro
)
290 ifeq ($(ARCH
),tilegx
)
294 # Where to locate arch specific headers
295 hdr-arch
:= $(SRCARCH
)
297 KCONFIG_CONFIG ?
= .config
298 export KCONFIG_CONFIG
300 # SHELL used by kbuild
301 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
302 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
303 else echo sh
; fi
; fi
)
307 HOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2
-fomit-frame-pointer
-std
=gnu89
310 # Decide whether to build built-in, modular, or both.
311 # Normally, just do built-in.
316 # If we have only "make modules", don't compile built-in objects.
317 # When we're building modules with modversions, we need to consider
318 # the built-in objects during the descend as well, in order to
319 # make sure the checksums are up to date before we record them.
321 ifeq ($(MAKECMDGOALS
),modules
)
322 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
325 # If we have "make <whatever> modules", compile modules
326 # in addition to whatever we do anyway.
327 # Just "make" or "make all" shall build modules as well
329 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
333 ifeq ($(MAKECMDGOALS
),)
337 export KBUILD_MODULES KBUILD_BUILTIN
338 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
340 # We need some generic definitions (do not try to remake the file).
341 scripts
/Kbuild.
include: ;
342 include scripts
/Kbuild.
include
344 # Make variables (CC, etc...)
345 AS
= $(CROSS_COMPILE
)as
346 LD
= $(CROSS_COMPILE
)ld
347 CC
= $(CROSS_COMPILE
)gcc
349 AR
= $(CROSS_COMPILE
)ar
350 NM
= $(CROSS_COMPILE
)nm
351 STRIP
= $(CROSS_COMPILE
)strip
352 OBJCOPY
= $(CROSS_COMPILE
)objcopy
353 OBJDUMP
= $(CROSS_COMPILE
)objdump
355 GENKSYMS
= scripts
/genksyms
/genksyms
356 INSTALLKERNEL
:= installkernel
357 DEPMOD
= /sbin
/depmod
362 ifeq ($(CONFIG_CRYPTO_FIPS
),)
363 READELF
= $(CROSS_COMPILE
)readelf
367 ifeq ($(CONFIG_FIPS_FMP
),)
368 READELF
= $(CROSS_COMPILE
)readelf
372 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
373 -Wbitwise
-Wno-return-void
$(CF
)
379 CFLAGS_GCOV
= -fprofile-arcs
-ftest-coverage
-fno-tree-loop-im
380 CFLAGS_KCOV
= -fsanitize-coverage
=trace-pc
383 # Use USERINCLUDE when you must reference the UAPI directories only.
385 -I
$(srctree
)/arch
/$(hdr-arch
)/include/uapi \
386 -Iarch
/$(hdr-arch
)/include/generated
/uapi \
387 -I
$(srctree
)/include/uapi \
388 -Iinclude
/generated
/uapi \
389 -include $(srctree
)/include/linux
/kconfig.h
391 # Use LINUXINCLUDE when you must reference the include/ directory.
392 # Needed to be compatible with the O= option
394 -I
$(srctree
)/arch
/$(hdr-arch
)/include \
395 -Iarch
/$(hdr-arch
)/include/generated
/uapi \
396 -Iarch
/$(hdr-arch
)/include/generated \
397 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
401 KBUILD_CPPFLAGS
:= -D__KERNEL__
403 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
404 -fno-strict-aliasing
-fno-common \
405 -Werror-implicit-function-declaration \
406 -Wno-format-security \
408 -std
=gnu89
$(call cc-option
,-fno-PIE
)
410 KBUILD_AFLAGS_KERNEL
:=
411 KBUILD_CFLAGS_KERNEL
:=
412 KBUILD_AFLAGS
:= -D__ASSEMBLY__
$(call cc-option
,-fno-PIE
)
413 KBUILD_AFLAGS_MODULE
:= -DMODULE
414 KBUILD_CFLAGS_MODULE
:= -DMODULE
415 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
417 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
418 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
419 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
421 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
422 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
423 export CPP AR NM STRIP OBJCOPY OBJDUMP
424 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
425 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
427 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
428 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN
429 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
430 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
431 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
432 export KBUILD_ARFLAGS
434 # When compiling out-of-tree modules, put MODVERDIR in the module
435 # tree rather than in the kernel tree. The kernel tree might
437 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
439 # Files to ignore in find ... statements
441 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
442 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
444 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
445 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
447 # ===========================================================================
448 # Rules shared between *config targets and build targets
450 # Basic helpers built in scripts/
451 PHONY
+= scripts_basic
453 $(Q
)$(MAKE
) $(build
)=scripts
/basic
454 $(Q
)rm -f .tmp_quiet_recordmcount
456 # To avoid any implicit rule to kick in, define an empty command.
457 scripts
/basic
/%: scripts_basic
;
459 PHONY
+= outputmakefile
460 # outputmakefile generates a Makefile in the output directory, if using a
461 # separate output directory. This allows convenient use of make in the
464 ifneq ($(KBUILD_SRC
),)
465 $(Q
)ln
-fsn
$(srctree
) source
466 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
467 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
470 # Support for using generic headers in asm-generic
473 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
474 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
475 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
476 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
478 ifneq ($(PLATFORM_VERSION
), )
479 PLATFORM_VERSION_NUMBER
=$(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/android-version.sh
$(PLATFORM_VERSION
))
480 MAJOR_VERSION
=$(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/android-major-version.sh
$(PLATFORM_VERSION
))
481 export ANDROID_VERSION
=$(PLATFORM_VERSION_NUMBER
)
482 export ANDROID_MAJOR_VERSION
=$(MAJOR_VERSION
)
483 KBUILD_CFLAGS
+= -DANDROID_VERSION
=$(PLATFORM_VERSION_NUMBER
)
484 KBUILD_CFLAGS
+= -DANDROID_MAJOR_VERSION
=$(MAJOR_VERSION
)
486 SELINUX_DIR
=$(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/find_matching_major.sh
"$(srctree)" "security/selinux" "$(ANDROID_MAJOR_VERSION)")
487 SDCARDFS_DIR
=$(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/find_matching_version.sh
"$(srctree)" "fs/sdcardfs" "$(ANDROID_VERSION)")
489 export ANDROID_VERSION
=990000
490 KBUILD_CFLAGS
+= -DANDROID_VERSION
=990000
492 PHONY
+= replace_dirs
494 ifneq ($(PLATFORM_VERSION
), )
496 @echo
"replace selinux from $(SELINUX_DIR)"
497 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/replace_dir.sh
"$(srctree)" "security/selinux" "$(SELINUX_DIR)"
498 @echo
"replace sdcardfs from $(SDCARDFS_DIR)"
499 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/replace_dir.sh
"$(srctree)" "fs/sdcardfs" "$(SDCARDFS_DIR)"
501 # To make sure we do not include .config for any of the *config targets
502 # catch them early, and hand them over to scripts/kconfig/Makefile
503 # It is allowed to specify more targets when calling make, including
504 # mixing *config targets and build targets.
505 # For example 'make oldconfig all'.
506 # Detect when mixed targets is specified, and make a second invocation
507 # of make so .config is not included in this case either (for *config).
509 version_h
:= include/generated
/uapi
/linux
/version.h
510 old_version_h
:= include/linux
/version.h
512 no-dot-config-targets
:= clean mrproper
distclean \
513 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
514 $(version_h
) headers_
% archheaders archscripts \
515 kernelversion
%src-pkg
521 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
522 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
527 ifeq ($(KBUILD_EXTMOD
),)
528 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
530 ifneq ($(words $(MAKECMDGOALS
)),1)
535 # install and module_install need also be processed one by one
536 ifneq ($(filter install,$(MAKECMDGOALS
)),)
537 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
542 ifeq ($(mixed-targets
),1)
543 # ===========================================================================
544 # We're called with mixed targets (*config and build targets).
545 # Handle them one by one.
547 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
549 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
554 for i in
$(MAKECMDGOALS
); do \
555 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
559 ifeq ($(config-targets
),1)
560 # ===========================================================================
561 # *config targets only - make sure prerequisites are updated, and descend
562 # in scripts/kconfig to make the *config target
564 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
565 # KBUILD_DEFCONFIG may point out an alternative default configuration
566 # used for 'make defconfig'
567 include arch
/$(SRCARCH
)/Makefile
568 export KBUILD_DEFCONFIG KBUILD_KCONFIG
570 config
: scripts_basic outputmakefile replace_dirs FORCE
571 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
573 %config
: scripts_basic outputmakefile replace_dirs FORCE
574 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
577 # ===========================================================================
578 # Build targets only - this includes vmlinux, arch specific targets, clean
579 # targets and others. In general all targets except *config targets.
581 ifeq ($(KBUILD_EXTMOD
),)
582 # Additional helpers built in scripts/
583 # Carefully list dependencies so we do not try to build scripts twice
586 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
588 $(Q
)$(MAKE
) $(build
)=$(@
)
590 # Objects we will link into vmlinux / subdirs we need to visit
592 drivers-y
:= drivers
/ sound
/ firmware
/
597 endif # KBUILD_EXTMOD
599 ifeq ($(dot-config
),1)
601 -include include/config
/auto.conf
603 ifeq ($(KBUILD_EXTMOD
),)
604 # Read in dependencies to all Kconfig* files, make sure to run
605 # oldconfig if changes are detected.
606 -include include/config
/auto.conf.cmd
608 # To avoid any implicit rule to kick in, define an empty command
609 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
611 # If .config is newer than include/config/auto.conf, someone tinkered
612 # with it and forgot to run make oldconfig.
613 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
614 # we execute the config step to be sure to catch updated Kconfig files
615 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
616 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
618 # external modules needs include/generated/autoconf.h and include/config/auto.conf
619 # but do not care if they are up-to-date. Use auto.conf to trigger the test
620 PHONY
+= include/config
/auto.conf
622 include/config
/auto.conf
:
623 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
625 echo
>&2 " ERROR: Kernel configuration is invalid."; \
626 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
627 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
631 endif # KBUILD_EXTMOD
634 # Dummy target needed, because used as prerequisite
635 include/config
/auto.conf
: ;
636 endif # $(dot-config)
638 # The all: target is the default when no target is given on the
640 # This allow a user to issue only 'make' to build a kernel including modules
641 # Defaults to vmlinux, but the arch makefile usually adds further targets
644 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
645 # values of the respective KBUILD_* variables
649 include arch
/$(SRCARCH
)/Makefile
651 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
652 KBUILD_CFLAGS
+= $(call cc-disable-warning
,maybe-uninitialized
,)
653 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
654 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
655 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
656 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
658 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
659 KBUILD_CFLAGS
+= $(call cc-option
,-Oz
,-Os
)
661 ifdef CONFIG_PROFILE_ALL_BRANCHES
668 # Tell gcc to never replace conditional load with a non-conditional one
669 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
671 # check for 'asm goto'
672 ifeq ($(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
673 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
674 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
677 ifdef CONFIG_READABLE_ASM
678 # Disable optimizations that make assembler listings hard to read.
679 # reorder blocks reorders the control in the function
680 # ipa clone creates specialized cloned functions
681 # partial inlining inlines only parts of functions
682 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
683 $(call cc-option
,-fno-ipa-cp-clone
,) \
684 $(call cc-option
,-fno-partial-inlining
)
687 ifneq ($(CONFIG_FRAME_WARN
),0)
688 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
691 # Handle stack protector mode.
693 # Since kbuild can potentially perform two passes (first with the old
694 # .config values and then with updated .config values), we cannot error out
695 # if a desired compiler option is unsupported. If we were to error, kbuild
696 # could never get to the second pass and actually notice that we changed
697 # the option to something that was supported.
699 # Additionally, we don't want to fallback and/or silently change which compiler
700 # flags will be used, since that leads to producing kernels with different
701 # security feature characteristics depending on the compiler used. ("But I
702 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
704 # The middle ground is to warn here so that the failed option is obvious, but
705 # to let the build fail with bad compiler flags so that we can't produce a
706 # kernel when there is a CONFIG and compiler mismatch.
708 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
709 stackp-flag
:= -fstack-protector
710 ifeq ($(call cc-option
, $(stackp-flag
)),)
711 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR
: \
712 -fstack-protector not supported by compiler
)
715 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
716 stackp-flag
:= -fstack-protector-strong
717 ifeq ($(call cc-option
, $(stackp-flag
)),)
718 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG
: \
719 -fstack-protector-strong not supported by compiler
)
722 # Force off for distro compilers that enable stack protector by default.
723 stackp-flag
:= $(call cc-option
, -fno-stack-protector
)
726 KBUILD_CFLAGS
+= $(stackp-flag
)
729 ifeq ($(call cc-option
, $(CFLAGS_KCOV
)),)
730 $(warning Cannot use CONFIG_KCOV
: \
731 -fsanitize-coverage
=trace-pc is not supported by compiler
)
736 ifeq ($(cc-name
),clang
)
737 ifneq ($(CROSS_COMPILE
),)
738 CLANG_TRIPLE ?
= $(CROSS_COMPILE
)
739 CLANG_TARGET
:= --target
=$(notdir $(CLANG_TRIPLE
:%-=%))
740 GCC_TOOLCHAIN
:= $(realpath
$(dir $(shell which
$(LD
)))/..
)
742 ifneq ($(GCC_TOOLCHAIN
),)
743 CLANG_GCC_TC
:= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
745 KBUILD_CFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
746 KBUILD_AFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
747 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
748 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
749 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
750 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
751 KBUILD_CFLAGS
+= $(call cc-disable-warning
, duplicate-decl-specifier
)
752 # Quiet clang warning: comparison of unsigned expression < 0 is always false
753 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
754 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
755 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
756 # See modpost pattern 2
757 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
758 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
759 KBUILD_CFLAGS
+= $(call cc-option
, -no-integrated-as
)
760 KBUILD_AFLAGS
+= $(call cc-option
, -no-integrated-as
)
763 # These warnings generated too much noise in a regular build.
764 # Use make W=1 to enable them (see scripts/Makefile.build)
765 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
768 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
769 ifdef CONFIG_FRAME_POINTER
770 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
772 # Some targets (ARM with Thumb2, for example), can't be built with frame
773 # pointers. For those, we don't have FUNCTION_TRACER automatically
774 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
775 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
776 # -fomit-frame-pointer with FUNCTION_TRACER.
777 ifndef CONFIG_FUNCTION_TRACER
778 KBUILD_CFLAGS
+= -fomit-frame-pointer
782 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
784 ifdef CONFIG_DEBUG_INFO
785 ifdef CONFIG_DEBUG_INFO_SPLIT
786 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
790 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
792 ifdef CONFIG_DEBUG_INFO_DWARF4
793 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
796 ifdef CONFIG_DEBUG_INFO_REDUCED
797 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
798 $(call cc-option
,-fno-var-tracking
)
801 ifdef CONFIG_FUNCTION_TRACER
802 ifndef CC_FLAGS_FTRACE
803 CC_FLAGS_FTRACE
:= -pg
805 export CC_FLAGS_FTRACE
806 ifdef CONFIG_HAVE_FENTRY
807 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
809 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
810 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
811 ifdef CONFIG_DYNAMIC_FTRACE
812 ifdef CONFIG_HAVE_C_RECORDMCOUNT
813 BUILD_C_RECORDMCOUNT
:= y
814 export BUILD_C_RECORDMCOUNT
819 # We trigger additional mismatches with less inlining
820 ifdef CONFIG_DEBUG_SECTION_MISMATCH
821 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
824 # arch Makefile may override CC so keep this after arch Makefile is included
825 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
826 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
828 # warn about C99 declaration after statement
829 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
831 # disable pointer signed / unsigned warnings in gcc 4.0
832 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
834 # disable invalid "can't wrap" optimizations for signed / pointers
835 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
837 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
838 KBUILD_CFLAGS
+= $(call cc-option
,-fno-stack-check
,)
840 # conserve stack if available
841 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
843 # disallow errors like 'EXPORT_GPL(foo);' with missing header
844 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
846 # require functions to have arguments in prototypes, not empty 'int foo()'
847 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
849 # Prohibit date/time macros, which would make the build non-deterministic
850 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
852 # use the deterministic mode of AR if available
853 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
855 include scripts
/Makefile.kasan
856 include scripts
/Makefile.extrawarn
858 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
860 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
861 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
862 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
864 ifeq ($(CONFIG_SENSORS_FINGERPRINT
), y
)
865 ifneq ($(CONFIG_SEC_FACTORY
), true
)
866 ifneq ($(SEC_BUILD_CONF_USE_FINGERPRINT_TZ
), false
)
867 export KBUILD_FP_SENSOR_CFLAGS
:= -DENABLE_SENSORS_FPRINT_SECURE
872 # Use --build-id when available.
873 LDFLAGS_BUILD_ID
= $(patsubst -Wl
$(comma
)%,%,\
874 $(call cc-ldoption
, -Wl
$(comma
)--build-id
,))
875 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
876 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
878 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
879 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
882 # Default kernel image to build when no specific target is given.
883 # KBUILD_IMAGE may be overruled on the command line or
884 # set in the environment
885 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
887 export KBUILD_IMAGE ?
= vmlinux
890 # INSTALL_PATH specifies where to place the updated kernel and system map
891 # images. Default is /boot, but you can set it to other values
892 export INSTALL_PATH ?
= /boot
895 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
896 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
897 # an argument if needed. Otherwise it defaults to the kernel install path
899 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
902 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
903 # relocations required by build roots. This is not defined in the
904 # makefile but the argument can be passed to make if needed.
907 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
911 # INSTALL_MOD_STRIP, if defined, will cause modules to be
912 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
913 # the default option --strip-debug will be used. Otherwise,
914 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
916 ifdef INSTALL_MOD_STRIP
917 ifeq ($(INSTALL_MOD_STRIP
),1)
918 mod_strip_cmd
= $(STRIP
) --strip-debug
920 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
921 endif # INSTALL_MOD_STRIP=1
924 endif # INSTALL_MOD_STRIP
927 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
928 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
929 # or CONFIG_MODULE_COMPRESS_XZ.
931 mod_compress_cmd
= true
932 ifdef CONFIG_MODULE_COMPRESS
933 ifdef CONFIG_MODULE_COMPRESS_GZIP
934 mod_compress_cmd
= gzip
-n
-f
935 endif # CONFIG_MODULE_COMPRESS_GZIP
936 ifdef CONFIG_MODULE_COMPRESS_XZ
937 mod_compress_cmd
= xz
-f
938 endif # CONFIG_MODULE_COMPRESS_XZ
939 endif # CONFIG_MODULE_COMPRESS
940 export mod_compress_cmd
942 # Select initial ramdisk compression format, default is gzip(1).
943 # This shall be used by the dracut(8) tool while creating an initramfs image.
945 INITRD_COMPRESS-y
:= gzip
946 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
947 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
948 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
949 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
950 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
951 # do not export INITRD_COMPRESS, since we didn't actually
952 # choose a sane default compression above.
953 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
955 ifdef CONFIG_MODULE_SIG_ALL
956 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
958 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
965 ifeq ($(KBUILD_EXTMOD
),)
966 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
968 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
969 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
970 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
972 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
973 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
975 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
976 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
977 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
978 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
979 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
980 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
981 libs-y
:= $(libs-y1
) $(libs-y2
)
982 virt-y
:= $(patsubst %/, %/built-in.o
, $(virt-y
))
984 # Externally visible symbols (used by link-vmlinux.sh)
985 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
986 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y
) $(drivers-y
) $(net-y
) $(virt-y
)
987 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
988 export LDFLAGS_vmlinux
989 # used by scripts/pacmage/Makefile
990 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
992 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
)
994 # Final link of vmlinux
995 cmd_link-vmlinux
= $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
)
996 quiet_cmd_link-vmlinux
= LINK
$@
998 # Include targets which we want to
999 # execute if the rest of the kernel build went well.
1000 vmlinux
: scripts
/link-vmlinux.sh print_info
$(vmlinux-deps
) FORCE
1001 ifdef CONFIG_HEADERS_CHECK
1002 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
1004 ifdef CONFIG_SAMPLES
1005 $(Q
)$(MAKE
) $(build
)=samples
1007 ifdef CONFIG_BUILD_DOCSRC
1008 $(Q
)$(MAKE
) $(build
)=Documentation
1010 ifdef CONFIG_GDB_SCRIPTS
1011 $(Q
)ln
-fsn
`cd $(srctree) && /bin/pwd`/scripts
/gdb
/vmlinux-gdb.py
1013 +$(call if_changed
,link-vmlinux
)
1017 @echo
"INFO: CC is $(CC)"
1019 # The actual objects are generated when descending,
1020 # make sure no implicit rule kicks in
1021 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
1023 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1024 # Preset locale variables to speed up the build process. Limit locale
1025 # tweaks to this spot to avoid wrong language settings when running
1026 # make menuconfig etc.
1027 # Error messages still appears in the original language
1029 PHONY
+= $(vmlinux-dirs
)
1030 $(vmlinux-dirs
): prepare scripts
1031 $(Q
)$(MAKE
) $(build
)=$@
1033 define filechk_kernel.release
1034 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1037 # Store (new) KERNELRELEASE string in include/config/kernel.release
1038 include/config
/kernel.release
: include/config
/auto.conf FORCE
1039 $(call filechk
,kernel.release
)
1042 # Things we need to do before we recursively start building the kernel
1043 # or the modules are listed in "prepare".
1044 # A multi level approach is used. prepareN is processed before prepareN-1.
1045 # archprepare is used in arch Makefiles and when processed asm symlink,
1046 # version.h and scripts_basic is processed / created.
1048 # Listed in dependency order
1049 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1051 # prepare3 is used to check if we are building in a separate output directory,
1053 # 1) Check that make has not been executed in the kernel src $(srctree)
1054 prepare3
: include/config
/kernel.release
1055 ifneq ($(KBUILD_SRC
),)
1056 @
$(kecho
) ' Using $(srctree) as source for kernel'
1057 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1058 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1059 echo
>&2 " in the '$(srctree)' directory.";\
1064 # prepare2 creates a makefile if using a separate output directory
1065 prepare2
: prepare3 outputmakefile asm-generic
1067 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
1068 include/config
/auto.conf
1071 archprepare
: archheaders archscripts prepare1 scripts_basic
1073 prepare0
: archprepare
1074 $(Q
)$(MAKE
) $(build
)=.
1076 # All the preparing..
1079 # Generate some files
1080 # ---------------------------------------------------------------------------
1082 # KERNELRELEASE can change from a few different places, meaning version.h
1083 # needs to be updated, so this check is forced on all builds
1086 define filechk_utsrelease.h
1087 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1088 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1091 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1094 define filechk_version.h
1095 (echo \
#define LINUX_VERSION_CODE $(shell \
1096 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1097 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1100 $(version_h
): $(srctree
)/Makefile FORCE
1101 $(call filechk
,version.h
)
1102 $(Q
)rm -f
$(old_version_h
)
1104 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1105 $(call filechk
,utsrelease.h
)
1109 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1110 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1112 # ---------------------------------------------------------------------------
1114 INSTALL_FW_PATH
=$(INSTALL_MOD_PATH
)/lib
/firmware
1115 export INSTALL_FW_PATH
1117 PHONY
+= firmware_install
1119 @mkdir
-p
$(objtree
)/firmware
1120 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_install
1122 # ---------------------------------------------------------------------------
1125 #Default location for installed headers
1126 export INSTALL_HDR_PATH
= $(objtree
)/usr
1128 # If we do an all arch process set dst to asm-$(hdr-arch)
1129 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/asm-
$(hdr-arch
), dst
=include/asm
)
1131 PHONY
+= archheaders
1134 PHONY
+= archscripts
1138 __headers
: $(version_h
) scripts_basic asm-generic archheaders archscripts
1139 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1141 PHONY
+= headers_install_all
1142 headers_install_all
:
1143 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1145 PHONY
+= headers_install
1146 headers_install
: __headers
1147 $(if
$(wildcard $(srctree
)/arch
/$(hdr-arch
)/include/uapi
/asm
/Kbuild
),, \
1148 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1149 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1150 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
)
1152 PHONY
+= headers_check_all
1153 headers_check_all
: headers_install_all
1154 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1156 PHONY
+= headers_check
1157 headers_check
: headers_install
1158 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi HDRCHECK
=1
1159 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
) HDRCHECK
=1
1161 # ---------------------------------------------------------------------------
1166 $(Q
)$(MAKE
) -C tools
/testing
/selftests run_tests
1169 $(Q
)$(MAKE
) -C tools
/testing
/selftests
clean
1171 # ---------------------------------------------------------------------------
1174 ifdef CONFIG_MODULES
1176 # By default, build modules as well
1182 # A module can be listed more than once in obj-m resulting in
1183 # duplicate lines in modules.order files. Those are removed
1184 # using awk while concatenating to the final file.
1187 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1188 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1189 @
$(kecho
) ' Building modules, stage 2.';
1190 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1191 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modbuild
1193 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1194 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1196 %/modules.builtin
: include/config
/auto.conf
1197 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1200 # Target to prepare building external modules
1201 PHONY
+= modules_prepare
1202 modules_prepare
: prepare scripts
1204 # Target to install modules
1205 PHONY
+= modules_install
1206 modules_install
: _modinst_ _modinst_post
1210 @
rm -rf
$(MODLIB
)/kernel
1211 @
rm -f
$(MODLIB
)/source
1212 @mkdir
-p
$(MODLIB
)/kernel
1213 @ln
-s
`cd $(srctree) && /bin/pwd` $(MODLIB
)/source
1214 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1215 rm -f
$(MODLIB
)/build
; \
1216 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1218 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1219 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1220 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1222 # This depmod is only for convenience to give the initial
1223 # boot a modules.dep even before / is mounted read-write. However the
1224 # boot script depmod is the master version.
1225 PHONY
+= _modinst_post
1226 _modinst_post
: _modinst_
1227 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modinst
1230 ifeq ($(CONFIG_MODULE_SIG
), y
)
1231 PHONY
+= modules_sign
1233 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1236 else # CONFIG_MODULES
1238 # Modules not configured
1239 # ---------------------------------------------------------------------------
1241 modules modules_install
: FORCE
1243 @echo
>&2 "The present kernel configuration has modules disabled."
1244 @echo
>&2 "Type 'make config' and enable loadable module support."
1245 @echo
>&2 "Then build a kernel with module support enabled."
1249 endif # CONFIG_MODULES
1252 # Cleaning is done on three levels.
1253 # make clean Delete most generated files
1254 # Leave enough to build external modules
1255 # make mrproper Delete the current configuration, and all generated files
1256 # make distclean Remove editor backup files, patch leftover files and the like
1258 # Directories & files removed with 'make clean'
1259 CLEAN_DIRS
+= $(MODVERDIR
)
1261 # Directories & files removed with 'make mrproper'
1262 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1263 arch
/*/include/generated .tmp_objdiff
1264 MRPROPER_FILES
+= .config .config.old .version .old_version \
1265 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1266 signing_key.pem signing_key.priv signing_key.x509 \
1267 x509.genkey extra_certificates signing_key.x509.keyid \
1268 signing_key.x509.signer vmlinux-gdb.py
1270 # clean - Delete most, but leave enough to build external modules
1272 clean: rm-dirs
:= $(CLEAN_DIRS
)
1273 clean: rm-files
:= $(CLEAN_FILES
)
1274 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1276 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1278 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1281 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1283 clean: archclean vmlinuxclean
1285 # mrproper - Delete all generated files, including .config
1287 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1288 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1289 mrproper-dirs
:= $(addprefix _mrproper_
,Documentation
/DocBook scripts
)
1291 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1293 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1295 mrproper
: clean archmrproper
$(mrproper-dirs
)
1304 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1305 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1306 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'.*.orig' \
1307 -o
-name
'.*.rej' -o
-name
'*%' -o
-name
'core' \
) \
1308 -type f
-print | xargs
rm -f
1311 # Packaging of the kernel to various formats
1312 # ---------------------------------------------------------------------------
1313 # rpm target kept for backward compatibility
1314 package-dir
:= scripts
/package
1317 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1318 %pkg
: include/config
/kernel.release FORCE
1319 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1320 rpm
: include/config
/kernel.release FORCE
1321 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1324 # Brief documentation of the typical targets used
1325 # ---------------------------------------------------------------------------
1327 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1328 boards
:= $(sort $(notdir $(boards
)))
1329 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1330 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1333 @echo
'Cleaning targets:'
1334 @echo
' clean - Remove most generated files but keep the config and'
1335 @echo
' enough build support to build external modules'
1336 @echo
' mrproper - Remove all generated files + config + various backup files'
1337 @echo
' distclean - mrproper + remove editor backup and patch files'
1339 @echo
'Configuration targets:'
1340 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1342 @echo
'Other generic targets:'
1343 @echo
' all - Build all targets marked with [*]'
1344 @echo
'* vmlinux - Build the bare kernel'
1345 @echo
'* modules - Build all modules'
1346 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1347 @echo
' firmware_install- Install all firmware to INSTALL_FW_PATH'
1348 @echo
' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1349 @echo
' dir/ - Build all files in dir and below'
1350 @echo
' dir/file.[ois] - Build specified target only'
1351 @echo
' dir/file.ll - Build the LLVM assembly file'
1352 @echo
' (requires compiler support for LLVM assembly generation)'
1353 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1354 @echo
' (requires a recent binutils and recent build (System.map))'
1355 @echo
' dir/file.ko - Build module including final link'
1356 @echo
' modules_prepare - Set up for building external modules'
1357 @echo
' tags/TAGS - Generate tags file for editors'
1358 @echo
' cscope - Generate cscope index'
1359 @echo
' gtags - Generate GNU GLOBAL index'
1360 @echo
' kernelrelease - Output the release version string (use with make -s)'
1361 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1362 @echo
' image_name - Output the image name (use with make -s)'
1363 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1364 echo
' (default: $(INSTALL_HDR_PATH))'; \
1366 @echo
'Static analysers'
1367 @echo
' checkstack - Generate a list of stack hogs'
1368 @echo
' namespacecheck - Name space analysis on compiled kernel'
1369 @echo
' versioncheck - Sanity check on version.h usage'
1370 @echo
' includecheck - Check for duplicate included header files'
1371 @echo
' export_report - List the usages of all exported symbols'
1372 @echo
' headers_check - Sanity check on exported headers'
1373 @echo
' headerdep - Detect inclusion cycles in headers'
1374 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.help checker-help
1376 @echo
'Kernel selftest'
1377 @echo
' kselftest - Build and run kernel selftest (run as root)'
1378 @echo
' Build, install, and boot kernel before'
1379 @echo
' running kselftest on it'
1380 @echo
' kselftest-clean - Remove all generated kselftest files'
1382 @echo
'Kernel packaging:'
1383 @
$(MAKE
) $(build
)=$(package-dir
) help
1385 @echo
'Documentation targets:'
1386 @
$(MAKE
) -f
$(srctree
)/Documentation
/DocBook
/Makefile dochelp
1388 @echo
'Architecture specific targets ($(SRCARCH)):'
1389 @
$(if
$(archhelp
),$(archhelp
),\
1390 echo
' No architecture specific help defined for $(SRCARCH)')
1393 $(foreach b
, $(boards
), \
1394 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1396 @
$(if
$(board-dirs
), \
1397 $(foreach b
, $(board-dirs
), \
1398 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1399 printf
" %-16s - Show all of the above\\n" help-boards
; \
1402 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1403 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1404 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1405 @echo
' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1406 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1407 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1408 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1409 @echo
' 1: warnings which may be relevant and do not occur too often'
1410 @echo
' 2: warnings which occur quite often but may still be relevant'
1411 @echo
' 3: more obscure warnings, can most likely be ignored'
1412 @echo
' Multiple levels can be combined with W=12 or W=123'
1414 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1415 @echo
'For further info see the ./README file'
1418 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1420 help-boards
: $(help-board-dirs
)
1422 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1424 $(help-board-dirs
): help-
%:
1425 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1426 @
$(if
$(boards-per-dir
), \
1427 $(foreach b
, $(boards-per-dir
), \
1428 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1432 # Documentation targets
1433 # ---------------------------------------------------------------------------
1434 %docs
: scripts_basic FORCE
1435 $(Q
)$(MAKE
) $(build
)=scripts build_docproc build_check-lc_ctype
1436 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
1438 else # KBUILD_EXTMOD
1441 # External module support.
1442 # When building external modules the kernel used as basis is considered
1443 # read-only, and no consistency checks are made and the make
1444 # system is not used on the basis kernel. If updates are required
1445 # in the basis kernel ordinary make commands (without M=...) must
1448 # The following are the only valid targets when building external
1450 # make M=dir clean Delete all automatically generated files
1451 # make M=dir modules Make all modules in specified dir
1452 # make M=dir Same as 'make M=dir modules'
1453 # make M=dir modules_install
1454 # Install the modules built in the module directory
1455 # Assumes install directory is already created
1457 # We are always building modules
1459 PHONY
+= crmodverdir
1463 PHONY
+= $(objtree
)/Module.symvers
1464 $(objtree
)/Module.symvers
:
1465 @
test -e
$(objtree
)/Module.symvers ||
( \
1467 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1468 echo
" is missing; modules will have no dependencies and modversions."; \
1471 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1472 PHONY
+= $(module-dirs
) modules
1473 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1474 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1476 modules
: $(module-dirs
)
1477 @
$(kecho
) ' Building modules, stage 2.';
1478 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1480 PHONY
+= modules_install
1481 modules_install
: _emodinst_ _emodinst_post
1483 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1486 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1487 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1489 PHONY
+= _emodinst_post
1490 _emodinst_post
: _emodinst_
1493 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1495 PHONY
+= $(clean-dirs
) clean
1497 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1499 clean: rm-dirs
:= $(MODVERDIR
)
1500 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1503 @echo
' Building external modules.'
1504 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1506 @echo
' modules - default target, build the module(s)'
1507 @echo
' modules_install - install the module'
1508 @echo
' clean - remove generated files in module directory only'
1512 PHONY
+= prepare scripts
1515 endif # KBUILD_EXTMOD
1517 clean: $(clean-dirs
)
1520 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1521 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1525 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1526 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1527 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1529 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1531 # Generate tags for editors
1532 # ---------------------------------------------------------------------------
1533 quiet_cmd_tags
= GEN
$@
1534 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1536 tags TAGS cscope gtags
: FORCE
1539 # Scripts to check various things for consistency
1540 # ---------------------------------------------------------------------------
1542 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1545 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1546 -name
'*.[hcS]' -type f
-print |
sort \
1547 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1550 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1551 -name
'*.[hcS]' -type f
-print |
sort \
1552 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1555 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1558 $(PERL
) $(srctree
)/scripts
/namespace.pl
1561 $(PERL
) $(srctree
)/scripts
/export_report.pl
1563 endif #ifeq ($(config-targets),1)
1564 endif #ifeq ($(mixed-targets),1)
1566 PHONY
+= checkstack kernelrelease kernelversion image_name
1568 # UML needs a little special treatment here. It wants to use the host
1569 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1570 # else wants $(ARCH), including people doing cross-builds, which means
1571 # that $(SUBARCH) doesn't work here.
1573 CHECKSTACK_ARCH
:= $(SUBARCH
)
1575 CHECKSTACK_ARCH
:= $(ARCH
)
1578 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1579 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1582 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1585 @echo
$(KERNELVERSION
)
1588 @echo
$(KBUILD_IMAGE
)
1590 # Clear a bunch of variables before executing the submake
1592 $(Q
)mkdir
-p
$(objtree
)/tools
1593 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(filter --j% -j,$(MAKEFLAGS))" O
=$(shell cd
$(objtree
) && /bin
/pwd
) subdir
=tools
-C
$(src
)/tools
/
1596 $(Q
)mkdir
-p
$(objtree
)/tools
1597 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(filter --j% -j,$(MAKEFLAGS))" O
=$(shell cd
$(objtree
) && /bin
/pwd
) subdir
=tools
-C
$(src
)/tools
/ $*
1600 # ---------------------------------------------------------------------------
1601 # Single targets are compatible with:
1602 # - build with mixed source and output
1603 # - build with separate output dir 'make O=...'
1604 # - external modules
1606 # target-dir => where to store outputfile
1607 # build-dir => directory in kernel source tree to use
1609 ifeq ($(KBUILD_EXTMOD
),)
1610 build-dir
= $(patsubst %/,%,$(dir $@
))
1611 target-dir
= $(dir $@
)
1613 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1614 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1615 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1618 %.s
: %.c prepare scripts FORCE
1619 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1620 %.i
: %.c prepare scripts FORCE
1621 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1622 %.o
: %.c prepare scripts FORCE
1623 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1624 %.lst
: %.c prepare scripts FORCE
1625 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1626 %.s
: %.S prepare scripts FORCE
1627 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1628 %.o
: %.S prepare scripts FORCE
1629 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1630 %.symtypes
: %.c prepare scripts FORCE
1631 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1632 %.ll
: %.c prepare scripts FORCE
1633 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1636 /: prepare scripts FORCE
1638 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1639 $(build
)=$(build-dir
)
1640 # Make sure the latest headers are built for Documentation
1641 Documentation
/: headers_install
1642 %/: prepare scripts FORCE
1644 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1645 $(build
)=$(build-dir
)
1646 %.ko
: prepare scripts FORCE
1648 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1649 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1650 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1652 # FIXME Should go into a make.lib or something
1653 # ===========================================================================
1655 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1656 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1658 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1659 cmd_rmfiles
= rm -f
$(rm-files
)
1661 # Run depmod only if we have System.map and depmod is executable
1662 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1663 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1664 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1666 # Create temporary dir for module support files
1667 # clean it up only when building all modules
1668 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1669 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1671 # read all saved command lines
1673 targets
:= $(wildcard $(sort $(targets
)))
1674 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1676 ifneq ($(cmd_files
),)
1677 $(cmd_files
): ; # Do not try to update included dependency files
1678 include $(cmd_files
)
1681 endif # skip-makefile
1686 # Declare the contents of the .PHONY variable as phony. We keep that
1687 # information in a variable so we can use it in if_changed and friends.