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 $(CURDIR
)/Makefile Makefile
: ;
131 ifneq ($(KBUILD_OUTPUT
),)
132 # Invoke a second make in the output directory, passing relevant variables
133 # check that the output directory actually exists
134 saved-output
:= $(KBUILD_OUTPUT
)
135 KBUILD_OUTPUT
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) \
137 $(if
$(KBUILD_OUTPUT
),, \
138 $(error failed to create output directory
"$(saved-output)"))
140 PHONY
+= $(MAKECMDGOALS
) sub-make
142 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
146 $(Q
)$(MAKE
) -C
$(KBUILD_OUTPUT
) KBUILD_SRC
=$(CURDIR
) \
147 -f
$(CURDIR
)/Makefile
$(filter-out _all sub-make
,$(MAKECMDGOALS
))
149 # Leave processing to above invocation of make
151 endif # ifneq ($(KBUILD_OUTPUT),)
152 endif # ifeq ($(KBUILD_SRC),)
154 # We process the rest of the Makefile if this is the final invocation of make
155 ifeq ($(skip-makefile
),)
157 # Do not print "Entering directory ...",
158 # but we want to display it when entering to the output directory
159 # so that IDEs/editors are able to understand relative filenames.
160 MAKEFLAGS
+= --no-print-directory
162 # Call a source code checker (by default, "sparse") as part of the
165 # Use 'make C=1' to enable checking of only re-compiled files.
166 # Use 'make C=2' to enable checking of *all* source files, regardless
167 # of whether they are re-compiled or not.
169 # See the file "Documentation/sparse.txt" for more details, including
170 # where to get the "sparse" utility.
172 ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC
= $(C
)
175 ifndef KBUILD_CHECKSRC
179 # Use make M=dir to specify directory of external module to build
180 # Old syntax make ... SUBDIRS=$PWD is still supported
181 # Setting the environment variable KBUILD_EXTMOD take precedence
183 KBUILD_EXTMOD ?
= $(SUBDIRS
)
186 ifeq ("$(origin M)", "command line")
187 KBUILD_EXTMOD
:= $(M
)
190 # If building an external module we do not care about the all: rule
191 # but instead _all depend on modules
193 ifeq ($(KBUILD_EXTMOD
),)
199 ifeq ($(KBUILD_SRC
),)
200 # building in the source tree
203 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
204 # building in a subdirectory of the source tree
207 srctree
:= $(KBUILD_SRC
)
214 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
216 export srctree objtree VPATH
219 # SUBARCH tells the usermode build what the underlying arch is. That is set
220 # first, and if a usermode build is happening, the "ARCH=um" on the command
221 # line overrides the setting of ARCH below. If a native build is happening,
222 # then ARCH is assigned, getting whatever value it gets normally, and
223 # SUBARCH is subsequently ignored.
225 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
226 -e s
/sun4u
/sparc64
/ \
227 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
228 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
229 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
230 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ )
232 # Cross compiling and selecting different set of gcc/bin-utils
233 # ---------------------------------------------------------------------------
235 # When performing cross compilation for other architectures ARCH shall be set
236 # to the target architecture. (See arch/* for the possibilities).
237 # ARCH can be set during invocation of make:
239 # Another way is to have ARCH set in the environment.
240 # The default ARCH is the host where make is executed.
242 # CROSS_COMPILE specify the prefix used for all executables used
243 # during compilation. Only gcc and related bin-utils executables
244 # are prefixed with $(CROSS_COMPILE).
245 # CROSS_COMPILE can be set on the command line
246 # make CROSS_COMPILE=ia64-linux-
247 # Alternatively CROSS_COMPILE can be set in the environment.
248 # A third alternative is to store a setting in .config so that plain
249 # "make" in the configured kernel build directory always uses that.
250 # Default value for CROSS_COMPILE is not to prefix executables
251 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
253 CROSS_COMPILE ?
= $(CONFIG_CROSS_COMPILE
:"%"=%)
255 # Architecture as present in compile.h
256 UTS_MACHINE
:= $(ARCH
)
259 # Additional ARCH settings for x86
263 ifeq ($(ARCH
),x86_64
)
267 # Additional ARCH settings for sparc
268 ifeq ($(ARCH
),sparc32
)
271 ifeq ($(ARCH
),sparc64
)
275 # Additional ARCH settings for sh
280 # Additional ARCH settings for tile
281 ifeq ($(ARCH
),tilepro
)
284 ifeq ($(ARCH
),tilegx
)
288 # Where to locate arch specific headers
289 hdr-arch
:= $(SRCARCH
)
291 KCONFIG_CONFIG ?
= .config
292 export KCONFIG_CONFIG
294 # SHELL used by kbuild
295 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
296 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
297 else echo sh
; fi
; fi
)
301 HOSTCFLAGS
= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2
-fomit-frame-pointer
-std
=gnu89
304 ifeq ($(shell $(HOSTCC
) -v
2>&1 | grep
-c
"clang version"), 1)
305 HOSTCFLAGS
+= -Wno-unused-value
-Wno-unused-parameter \
306 -Wno-missing-field-initializers
-fno-delete-null-pointer-checks
309 # Decide whether to build built-in, modular, or both.
310 # Normally, just do built-in.
315 # If we have only "make modules", don't compile built-in objects.
316 # When we're building modules with modversions, we need to consider
317 # the built-in objects during the descend as well, in order to
318 # make sure the checksums are up to date before we record them.
320 ifeq ($(MAKECMDGOALS
),modules
)
321 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
324 # If we have "make <whatever> modules", compile modules
325 # in addition to whatever we do anyway.
326 # Just "make" or "make all" shall build modules as well
328 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
332 ifeq ($(MAKECMDGOALS
),)
336 export KBUILD_MODULES KBUILD_BUILTIN
337 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
340 ifeq ($(shell $(CC
) -v
2>&1 | grep
-c
"clang version"), 1)
348 # We need some generic definitions (do not try to remake the file).
349 scripts
/Kbuild.
include: ;
350 include scripts
/Kbuild.
include
352 # Make variables (CC, etc...)
353 AS
= $(CROSS_COMPILE
)as
354 LD
= $(CROSS_COMPILE
)ld
355 CC
= $(CROSS_COMPILE
)gcc
357 AR
= $(CROSS_COMPILE
)ar
358 NM
= $(CROSS_COMPILE
)nm
359 STRIP
= $(CROSS_COMPILE
)strip
360 OBJCOPY
= $(CROSS_COMPILE
)objcopy
361 OBJDUMP
= $(CROSS_COMPILE
)objdump
363 GENKSYMS
= scripts
/genksyms
/genksyms
364 INSTALLKERNEL
:= installkernel
365 DEPMOD
= /sbin
/depmod
370 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
371 -Wbitwise
-Wno-return-void
$(CF
)
377 CFLAGS_GCOV
= -fprofile-arcs
-ftest-coverage
-fno-tree-loop-im
380 # Use USERINCLUDE when you must reference the UAPI directories only.
382 -I
$(srctree
)/arch
/$(hdr-arch
)/include/uapi \
383 -Iarch
/$(hdr-arch
)/include/generated
/uapi \
384 -I
$(srctree
)/include/uapi \
385 -Iinclude
/generated
/uapi \
386 -include $(srctree
)/include/linux
/kconfig.h
388 # Use LINUXINCLUDE when you must reference the include/ directory.
389 # Needed to be compatible with the O= option
391 -I
$(srctree
)/arch
/$(hdr-arch
)/include \
392 -Iarch
/$(hdr-arch
)/include/generated
/uapi \
393 -Iarch
/$(hdr-arch
)/include/generated \
394 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
398 KBUILD_CPPFLAGS
:= -D__KERNEL__
400 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
401 -fno-strict-aliasing
-fno-common \
402 -Werror-implicit-function-declaration \
403 -Wno-format-security \
406 KBUILD_AFLAGS_KERNEL
:=
407 KBUILD_CFLAGS_KERNEL
:=
408 KBUILD_AFLAGS
:= -D__ASSEMBLY__
409 KBUILD_AFLAGS_MODULE
:= -DMODULE
410 KBUILD_CFLAGS_MODULE
:= -DMODULE
411 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
413 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
414 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
415 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
417 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
418 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
419 export CPP AR NM STRIP OBJCOPY OBJDUMP
420 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
421 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
423 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
424 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
425 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
426 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
427 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
428 export KBUILD_ARFLAGS
430 # When compiling out-of-tree modules, put MODVERDIR in the module
431 # tree rather than in the kernel tree. The kernel tree might
433 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
435 # Files to ignore in find ... statements
437 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
438 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
440 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
441 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
443 # ===========================================================================
444 # Rules shared between *config targets and build targets
446 # Basic helpers built in scripts/
447 PHONY
+= scripts_basic
449 $(Q
)$(MAKE
) $(build
)=scripts
/basic
450 $(Q
)rm -f .tmp_quiet_recordmcount
452 # To avoid any implicit rule to kick in, define an empty command.
453 scripts
/basic
/%: scripts_basic
;
455 PHONY
+= outputmakefile
456 # outputmakefile generates a Makefile in the output directory, if using a
457 # separate output directory. This allows convenient use of make in the
460 ifneq ($(KBUILD_SRC
),)
461 $(Q
)ln
-fsn
$(srctree
) source
462 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
463 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
466 # Support for using generic headers in asm-generic
469 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
470 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
471 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
472 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
474 # To make sure we do not include .config for any of the *config targets
475 # catch them early, and hand them over to scripts/kconfig/Makefile
476 # It is allowed to specify more targets when calling make, including
477 # mixing *config targets and build targets.
478 # For example 'make oldconfig all'.
479 # Detect when mixed targets is specified, and make a second invocation
480 # of make so .config is not included in this case either (for *config).
482 version_h
:= include/generated
/uapi
/linux
/version.h
483 old_version_h
:= include/linux
/version.h
485 no-dot-config-targets
:= clean mrproper
distclean \
486 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
487 $(version_h
) headers_
% archheaders archscripts \
488 kernelversion
%src-pkg
494 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
495 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
500 ifeq ($(KBUILD_EXTMOD
),)
501 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
503 ifneq ($(words $(MAKECMDGOALS
)),1)
509 ifeq ($(mixed-targets
),1)
510 # ===========================================================================
511 # We're called with mixed targets (*config and build targets).
512 # Handle them one by one.
514 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
516 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
521 for i in
$(MAKECMDGOALS
); do \
522 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
526 ifeq ($(config-targets
),1)
527 # ===========================================================================
528 # *config targets only - make sure prerequisites are updated, and descend
529 # in scripts/kconfig to make the *config target
531 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
532 # KBUILD_DEFCONFIG may point out an alternative default configuration
533 # used for 'make defconfig'
534 include arch
/$(SRCARCH
)/Makefile
535 export KBUILD_DEFCONFIG KBUILD_KCONFIG
537 config
: scripts_basic outputmakefile FORCE
538 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
540 %config
: scripts_basic outputmakefile FORCE
541 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
544 # ===========================================================================
545 # Build targets only - this includes vmlinux, arch specific targets, clean
546 # targets and others. In general all targets except *config targets.
548 ifeq ($(KBUILD_EXTMOD
),)
549 # Additional helpers built in scripts/
550 # Carefully list dependencies so we do not try to build scripts twice
553 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
555 $(Q
)$(MAKE
) $(build
)=$(@
)
557 # Objects we will link into vmlinux / subdirs we need to visit
559 drivers-y
:= drivers
/ sound
/ firmware
/
563 endif # KBUILD_EXTMOD
565 ifeq ($(dot-config
),1)
567 -include include/config
/auto.conf
569 ifeq ($(KBUILD_EXTMOD
),)
570 # Read in dependencies to all Kconfig* files, make sure to run
571 # oldconfig if changes are detected.
572 -include include/config
/auto.conf.cmd
574 # To avoid any implicit rule to kick in, define an empty command
575 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
577 # If .config is newer than include/config/auto.conf, someone tinkered
578 # with it and forgot to run make oldconfig.
579 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
580 # we execute the config step to be sure to catch updated Kconfig files
581 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
582 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
584 # external modules needs include/generated/autoconf.h and include/config/auto.conf
585 # but do not care if they are up-to-date. Use auto.conf to trigger the test
586 PHONY
+= include/config
/auto.conf
588 include/config
/auto.conf
:
589 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
591 echo
>&2 " ERROR: Kernel configuration is invalid."; \
592 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
593 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
597 endif # KBUILD_EXTMOD
600 # Dummy target needed, because used as prerequisite
601 include/config
/auto.conf
: ;
602 endif # $(dot-config)
604 # The all: target is the default when no target is given on the
606 # This allow a user to issue only 'make' to build a kernel including modules
607 # Defaults to vmlinux, but the arch makefile usually adds further targets
610 include arch
/$(SRCARCH
)/Makefile
612 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
613 KBUILD_CFLAGS
+= $(call cc-option
,-fno-PIE
)
614 KBUILD_AFLAGS
+= $(call cc-option
,-fno-PIE
)
615 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
616 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
617 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
618 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
620 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
621 KBUILD_CFLAGS
+= -Os
$(call cc-disable-warning
,maybe-uninitialized
,)
626 # Tell gcc to never replace conditional load with a non-conditional one
627 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
629 # check for 'asm goto'
630 ifeq ($(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
631 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
632 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
635 ifdef CONFIG_READABLE_ASM
636 # Disable optimizations that make assembler listings hard to read.
637 # reorder blocks reorders the control in the function
638 # ipa clone creates specialized cloned functions
639 # partial inlining inlines only parts of functions
640 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
641 $(call cc-option
,-fno-ipa-cp-clone
,) \
642 $(call cc-option
,-fno-partial-inlining
)
645 ifneq ($(CONFIG_FRAME_WARN
),0)
646 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
649 # Handle stack protector mode.
651 # Since kbuild can potentially perform two passes (first with the old
652 # .config values and then with updated .config values), we cannot error out
653 # if a desired compiler option is unsupported. If we were to error, kbuild
654 # could never get to the second pass and actually notice that we changed
655 # the option to something that was supported.
657 # Additionally, we don't want to fallback and/or silently change which compiler
658 # flags will be used, since that leads to producing kernels with different
659 # security feature characteristics depending on the compiler used. ("But I
660 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
662 # The middle ground is to warn here so that the failed option is obvious, but
663 # to let the build fail with bad compiler flags so that we can't produce a
664 # kernel when there is a CONFIG and compiler mismatch.
666 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
667 stackp-flag
:= -fstack-protector
668 ifeq ($(call cc-option
, $(stackp-flag
)),)
669 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR
: \
670 -fstack-protector not supported by compiler
)
673 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
674 stackp-flag
:= -fstack-protector-strong
675 ifeq ($(call cc-option
, $(stackp-flag
)),)
676 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG
: \
677 -fstack-protector-strong not supported by compiler
)
680 # Force off for distro compilers that enable stack protector by default.
681 stackp-flag
:= $(call cc-option
, -fno-stack-protector
)
684 KBUILD_CFLAGS
+= $(stackp-flag
)
686 ifeq ($(COMPILER
),clang
)
687 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
688 KBUILD_CPPFLAGS
+= $(call cc-option
,-Wno-unknown-warning-option
,)
689 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-variable
)
690 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
691 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
692 # Quiet clang warning: comparison of unsigned expression < 0 is always false
693 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
694 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
695 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
696 # See modpost pattern 2
697 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
698 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
701 # These warnings generated too much noise in a regular build.
702 # Use make W=1 to enable them (see scripts/Makefile.build)
703 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
704 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
707 ifdef CONFIG_FRAME_POINTER
708 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
710 # Some targets (ARM with Thumb2, for example), can't be built with frame
711 # pointers. For those, we don't have FUNCTION_TRACER automatically
712 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
713 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
714 # -fomit-frame-pointer with FUNCTION_TRACER.
715 ifndef CONFIG_FUNCTION_TRACER
716 KBUILD_CFLAGS
+= -fomit-frame-pointer
720 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
722 ifdef CONFIG_DEBUG_INFO
723 ifdef CONFIG_DEBUG_INFO_SPLIT
724 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
728 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
730 ifdef CONFIG_DEBUG_INFO_DWARF4
731 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
734 ifdef CONFIG_DEBUG_INFO_REDUCED
735 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
736 $(call cc-option
,-fno-var-tracking
)
739 ifdef CONFIG_FUNCTION_TRACER
740 ifndef CC_FLAGS_FTRACE
741 CC_FLAGS_FTRACE
:= -pg
743 export CC_FLAGS_FTRACE
744 ifdef CONFIG_HAVE_FENTRY
745 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
747 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
748 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
749 ifdef CONFIG_DYNAMIC_FTRACE
750 ifdef CONFIG_HAVE_C_RECORDMCOUNT
751 BUILD_C_RECORDMCOUNT
:= y
752 export BUILD_C_RECORDMCOUNT
757 # We trigger additional mismatches with less inlining
758 ifdef CONFIG_DEBUG_SECTION_MISMATCH
759 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
762 # arch Makefile may override CC so keep this after arch Makefile is included
763 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
764 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
766 # warn about C99 declaration after statement
767 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
769 # disable pointer signed / unsigned warnings in gcc 4.0
770 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
772 # disable invalid "can't wrap" optimizations for signed / pointers
773 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
775 # conserve stack if available
776 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
778 # disallow errors like 'EXPORT_GPL(foo);' with missing header
779 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
781 # require functions to have arguments in prototypes, not empty 'int foo()'
782 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
784 # Prohibit date/time macros, which would make the build non-deterministic
785 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
787 # use the deterministic mode of AR if available
788 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
790 include scripts
/Makefile.kasan
791 include scripts
/Makefile.extrawarn
793 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
795 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
796 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
797 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
799 # Use --build-id when available.
800 LDFLAGS_BUILD_ID
= $(patsubst -Wl
$(comma
)%,%,\
801 $(call cc-ldoption
, -Wl
$(comma
)--build-id
,))
802 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
803 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
805 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
806 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
809 # Default kernel image to build when no specific target is given.
810 # KBUILD_IMAGE may be overruled on the command line or
811 # set in the environment
812 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
814 export KBUILD_IMAGE ?
= vmlinux
817 # INSTALL_PATH specifies where to place the updated kernel and system map
818 # images. Default is /boot, but you can set it to other values
819 export INSTALL_PATH ?
= /boot
822 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
823 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
824 # an argument if needed. Otherwise it defaults to the kernel install path
826 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
829 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
830 # relocations required by build roots. This is not defined in the
831 # makefile but the argument can be passed to make if needed.
834 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
838 # INSTALL_MOD_STRIP, if defined, will cause modules to be
839 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
840 # the default option --strip-debug will be used. Otherwise,
841 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
843 ifdef INSTALL_MOD_STRIP
844 ifeq ($(INSTALL_MOD_STRIP
),1)
845 mod_strip_cmd
= $(STRIP
) --strip-debug
847 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
848 endif # INSTALL_MOD_STRIP=1
851 endif # INSTALL_MOD_STRIP
854 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
855 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
856 # or CONFIG_MODULE_COMPRESS_XZ.
858 mod_compress_cmd
= true
859 ifdef CONFIG_MODULE_COMPRESS
860 ifdef CONFIG_MODULE_COMPRESS_GZIP
861 mod_compress_cmd
= gzip
-n
862 endif # CONFIG_MODULE_COMPRESS_GZIP
863 ifdef CONFIG_MODULE_COMPRESS_XZ
864 mod_compress_cmd
= xz
865 endif # CONFIG_MODULE_COMPRESS_XZ
866 endif # CONFIG_MODULE_COMPRESS
867 export mod_compress_cmd
869 # Select initial ramdisk compression format, default is gzip(1).
870 # This shall be used by the dracut(8) tool while creating an initramfs image.
872 INITRD_COMPRESS-y
:= gzip
873 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
874 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
875 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
876 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
877 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
878 # do not export INITRD_COMPRESS, since we didn't actually
879 # choose a sane default compression above.
880 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
882 ifdef CONFIG_MODULE_SIG_ALL
883 MODSECKEY
= .
/signing_key.priv
884 MODPUBKEY
= .
/signing_key.x509
886 mod_sign_cmd
= perl
$(srctree
)/scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODSECKEY
) $(MODPUBKEY
)
893 ifeq ($(KBUILD_EXTMOD
),)
894 core-y
+= kernel
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
896 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
897 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
898 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
)))
900 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
901 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
))))
903 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
904 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
905 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
906 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
907 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
908 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
909 libs-y
:= $(libs-y1
) $(libs-y2
)
911 # Externally visible symbols (used by link-vmlinux.sh)
912 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
913 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y
) $(drivers-y
) $(net-y
)
914 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
915 export LDFLAGS_vmlinux
916 # used by scripts/pacmage/Makefile
917 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools virt
)
919 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
)
921 # Final link of vmlinux
922 cmd_link-vmlinux
= $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
)
923 quiet_cmd_link-vmlinux
= LINK
$@
925 # Include targets which we want to
926 # execute if the rest of the kernel build went well.
927 vmlinux
: scripts
/link-vmlinux.sh
$(vmlinux-deps
) FORCE
928 ifdef CONFIG_HEADERS_CHECK
929 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
932 $(Q
)$(MAKE
) $(build
)=samples
934 ifdef CONFIG_BUILD_DOCSRC
935 $(Q
)$(MAKE
) $(build
)=Documentation
937 ifdef CONFIG_GDB_SCRIPTS
938 $(Q
)ln
-fsn
`cd $(srctree) && /bin/pwd`/scripts
/gdb
/vmlinux-gdb.py
940 +$(call if_changed
,link-vmlinux
)
942 # The actual objects are generated when descending,
943 # make sure no implicit rule kicks in
944 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
946 # Handle descending into subdirectories listed in $(vmlinux-dirs)
947 # Preset locale variables to speed up the build process. Limit locale
948 # tweaks to this spot to avoid wrong language settings when running
949 # make menuconfig etc.
950 # Error messages still appears in the original language
952 PHONY
+= $(vmlinux-dirs
)
953 $(vmlinux-dirs
): prepare scripts
954 $(Q
)$(MAKE
) $(build
)=$@
956 define filechk_kernel.release
957 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
960 # Store (new) KERNELRELEASE string in include/config/kernel.release
961 include/config
/kernel.release
: include/config
/auto.conf FORCE
962 $(call filechk
,kernel.release
)
965 # Things we need to do before we recursively start building the kernel
966 # or the modules are listed in "prepare".
967 # A multi level approach is used. prepareN is processed before prepareN-1.
968 # archprepare is used in arch Makefiles and when processed asm symlink,
969 # version.h and scripts_basic is processed / created.
971 # Listed in dependency order
972 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
974 # prepare3 is used to check if we are building in a separate output directory,
976 # 1) Check that make has not been executed in the kernel src $(srctree)
977 prepare3
: include/config
/kernel.release
978 ifneq ($(KBUILD_SRC
),)
979 @
$(kecho
) ' Using $(srctree) as source for kernel'
980 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
981 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
982 echo
>&2 " in the '$(srctree)' directory.";\
987 # prepare2 creates a makefile if using a separate output directory
988 prepare2
: prepare3 outputmakefile asm-generic
990 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
991 include/config
/auto.conf
994 archprepare
: archheaders archscripts prepare1 scripts_basic
996 prepare0
: archprepare FORCE
997 $(Q
)$(MAKE
) $(build
)=.
999 # All the preparing..
1002 # Generate some files
1003 # ---------------------------------------------------------------------------
1005 # KERNELRELEASE can change from a few different places, meaning version.h
1006 # needs to be updated, so this check is forced on all builds
1009 define filechk_utsrelease.h
1010 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1011 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1014 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1017 define filechk_version.h
1018 (echo \
#define LINUX_VERSION_CODE $(shell \
1019 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1020 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1023 $(version_h
): $(srctree
)/Makefile FORCE
1024 $(call filechk
,version.h
)
1025 $(Q
)rm -f
$(old_version_h
)
1027 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1028 $(call filechk
,utsrelease.h
)
1032 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1033 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1035 # ---------------------------------------------------------------------------
1037 INSTALL_FW_PATH
=$(INSTALL_MOD_PATH
)/lib
/firmware
1038 export INSTALL_FW_PATH
1040 PHONY
+= firmware_install
1041 firmware_install
: FORCE
1042 @mkdir
-p
$(objtree
)/firmware
1043 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_install
1045 # ---------------------------------------------------------------------------
1048 #Default location for installed headers
1049 export INSTALL_HDR_PATH
= $(objtree
)/usr
1051 # If we do an all arch process set dst to asm-$(hdr-arch)
1052 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/asm-
$(hdr-arch
), dst
=include/asm
)
1054 PHONY
+= archheaders
1057 PHONY
+= archscripts
1061 __headers
: $(version_h
) scripts_basic asm-generic archheaders archscripts FORCE
1062 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1064 PHONY
+= headers_install_all
1065 headers_install_all
:
1066 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1068 PHONY
+= headers_install
1069 headers_install
: __headers
1070 $(if
$(wildcard $(srctree
)/arch
/$(hdr-arch
)/include/uapi
/asm
/Kbuild
),, \
1071 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1072 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1073 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
)
1075 PHONY
+= headers_check_all
1076 headers_check_all
: headers_install_all
1077 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1079 PHONY
+= headers_check
1080 headers_check
: headers_install
1081 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi HDRCHECK
=1
1082 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
) HDRCHECK
=1
1084 # ---------------------------------------------------------------------------
1089 $(Q
)$(MAKE
) -C tools
/testing
/selftests run_tests
1091 # ---------------------------------------------------------------------------
1094 ifdef CONFIG_MODULES
1096 # By default, build modules as well
1102 # A module can be listed more than once in obj-m resulting in
1103 # duplicate lines in modules.order files. Those are removed
1104 # using awk while concatenating to the final file.
1107 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1108 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1109 @
$(kecho
) ' Building modules, stage 2.';
1110 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1111 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modbuild
1113 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1114 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1116 %/modules.builtin
: include/config
/auto.conf
1117 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1120 # Target to prepare building external modules
1121 PHONY
+= modules_prepare
1122 modules_prepare
: prepare scripts
1124 # Target to install modules
1125 PHONY
+= modules_install
1126 modules_install
: _modinst_ _modinst_post
1130 @
rm -rf
$(MODLIB
)/kernel
1131 @
rm -f
$(MODLIB
)/source
1132 @mkdir
-p
$(MODLIB
)/kernel
1133 @ln
-s
`cd $(srctree) && /bin/pwd` $(MODLIB
)/source
1134 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1135 rm -f
$(MODLIB
)/build
; \
1136 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1138 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1139 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1140 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1142 # This depmod is only for convenience to give the initial
1143 # boot a modules.dep even before / is mounted read-write. However the
1144 # boot script depmod is the master version.
1145 PHONY
+= _modinst_post
1146 _modinst_post
: _modinst_
1147 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modinst
1150 ifeq ($(CONFIG_MODULE_SIG
), y
)
1151 PHONY
+= modules_sign
1153 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1156 else # CONFIG_MODULES
1158 # Modules not configured
1159 # ---------------------------------------------------------------------------
1161 modules modules_install
: FORCE
1163 @echo
>&2 "The present kernel configuration has modules disabled."
1164 @echo
>&2 "Type 'make config' and enable loadable module support."
1165 @echo
>&2 "Then build a kernel with module support enabled."
1169 endif # CONFIG_MODULES
1172 # Cleaning is done on three levels.
1173 # make clean Delete most generated files
1174 # Leave enough to build external modules
1175 # make mrproper Delete the current configuration, and all generated files
1176 # make distclean Remove editor backup files, patch leftover files and the like
1178 # Directories & files removed with 'make clean'
1179 CLEAN_DIRS
+= $(MODVERDIR
)
1181 # Directories & files removed with 'make mrproper'
1182 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1183 arch
/*/include/generated .tmp_objdiff
1184 MRPROPER_FILES
+= .config .config.old .version .old_version \
1185 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1186 signing_key.priv signing_key.x509 x509.genkey \
1187 extra_certificates signing_key.x509.keyid \
1188 signing_key.x509.signer vmlinux-gdb.py
1190 # clean - Delete most, but leave enough to build external modules
1192 clean: rm-dirs
:= $(CLEAN_DIRS
)
1193 clean: rm-files
:= $(CLEAN_FILES
)
1194 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1196 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1198 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1201 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1203 clean: archclean vmlinuxclean
1205 # mrproper - Delete all generated files, including .config
1207 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1208 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1209 mrproper-dirs
:= $(addprefix _mrproper_
,Documentation
/DocBook scripts
)
1211 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1213 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1215 mrproper
: clean archmrproper
$(mrproper-dirs
)
1224 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1225 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1226 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'.*.orig' \
1227 -o
-name
'.*.rej' -o
-name
'*%' -o
-name
'core' \
) \
1228 -type f
-print | xargs
rm -f
1231 # Packaging of the kernel to various formats
1232 # ---------------------------------------------------------------------------
1233 # rpm target kept for backward compatibility
1234 package-dir
:= scripts
/package
1237 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1238 %pkg
: include/config
/kernel.release FORCE
1239 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1240 rpm
: include/config
/kernel.release FORCE
1241 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1244 # Brief documentation of the typical targets used
1245 # ---------------------------------------------------------------------------
1247 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1248 boards
:= $(sort $(notdir $(boards
)))
1249 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1250 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1253 @echo
'Cleaning targets:'
1254 @echo
' clean - Remove most generated files but keep the config and'
1255 @echo
' enough build support to build external modules'
1256 @echo
' mrproper - Remove all generated files + config + various backup files'
1257 @echo
' distclean - mrproper + remove editor backup and patch files'
1259 @echo
'Configuration targets:'
1260 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1262 @echo
'Other generic targets:'
1263 @echo
' all - Build all targets marked with [*]'
1264 @echo
'* vmlinux - Build the bare kernel'
1265 @echo
'* modules - Build all modules'
1266 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1267 @echo
' firmware_install- Install all firmware to INSTALL_FW_PATH'
1268 @echo
' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1269 @echo
' dir/ - Build all files in dir and below'
1270 @echo
' dir/file.[oisS] - Build specified target only'
1271 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1272 @echo
' (requires a recent binutils and recent build (System.map))'
1273 @echo
' dir/file.ko - Build module including final link'
1274 @echo
' modules_prepare - Set up for building external modules'
1275 @echo
' tags/TAGS - Generate tags file for editors'
1276 @echo
' cscope - Generate cscope index'
1277 @echo
' gtags - Generate GNU GLOBAL index'
1278 @echo
' kernelrelease - Output the release version string (use with make -s)'
1279 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1280 @echo
' image_name - Output the image name (use with make -s)'
1281 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1282 echo
' (default: $(INSTALL_HDR_PATH))'; \
1284 @echo
'Static analysers'
1285 @echo
' checkstack - Generate a list of stack hogs'
1286 @echo
' namespacecheck - Name space analysis on compiled kernel'
1287 @echo
' versioncheck - Sanity check on version.h usage'
1288 @echo
' includecheck - Check for duplicate included header files'
1289 @echo
' export_report - List the usages of all exported symbols'
1290 @echo
' headers_check - Sanity check on exported headers'
1291 @echo
' headerdep - Detect inclusion cycles in headers'
1292 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.help checker-help
1294 @echo
'Kernel selftest'
1295 @echo
' kselftest - Build and run kernel selftest (run as root)'
1296 @echo
' Build, install, and boot kernel before'
1297 @echo
' running kselftest on it'
1299 @echo
'Kernel packaging:'
1300 @
$(MAKE
) $(build
)=$(package-dir
) help
1302 @echo
'Documentation targets:'
1303 @
$(MAKE
) -f
$(srctree
)/Documentation
/DocBook
/Makefile dochelp
1305 @echo
'Architecture specific targets ($(SRCARCH)):'
1306 @
$(if
$(archhelp
),$(archhelp
),\
1307 echo
' No architecture specific help defined for $(SRCARCH)')
1310 $(foreach b
, $(boards
), \
1311 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1313 @
$(if
$(board-dirs
), \
1314 $(foreach b
, $(board-dirs
), \
1315 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1316 printf
" %-16s - Show all of the above\\n" help-boards
; \
1319 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1320 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1321 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1322 @echo
' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1323 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1324 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1325 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1326 @echo
' 1: warnings which may be relevant and do not occur too often'
1327 @echo
' 2: warnings which occur quite often but may still be relevant'
1328 @echo
' 3: more obscure warnings, can most likely be ignored'
1329 @echo
' Multiple levels can be combined with W=12 or W=123'
1331 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1332 @echo
'For further info see the ./README file'
1335 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1337 help-boards
: $(help-board-dirs
)
1339 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1341 $(help-board-dirs
): help-
%:
1342 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1343 @
$(if
$(boards-per-dir
), \
1344 $(foreach b
, $(boards-per-dir
), \
1345 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1349 # Documentation targets
1350 # ---------------------------------------------------------------------------
1351 %docs
: scripts_basic FORCE
1352 $(Q
)$(MAKE
) $(build
)=scripts build_docproc
1353 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
1355 else # KBUILD_EXTMOD
1358 # External module support.
1359 # When building external modules the kernel used as basis is considered
1360 # read-only, and no consistency checks are made and the make
1361 # system is not used on the basis kernel. If updates are required
1362 # in the basis kernel ordinary make commands (without M=...) must
1365 # The following are the only valid targets when building external
1367 # make M=dir clean Delete all automatically generated files
1368 # make M=dir modules Make all modules in specified dir
1369 # make M=dir Same as 'make M=dir modules'
1370 # make M=dir modules_install
1371 # Install the modules built in the module directory
1372 # Assumes install directory is already created
1374 # We are always building modules
1376 PHONY
+= crmodverdir
1380 PHONY
+= $(objtree
)/Module.symvers
1381 $(objtree
)/Module.symvers
:
1382 @
test -e
$(objtree
)/Module.symvers ||
( \
1384 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1385 echo
" is missing; modules will have no dependencies and modversions."; \
1388 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1389 PHONY
+= $(module-dirs
) modules
1390 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1391 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1393 modules
: $(module-dirs
)
1394 @
$(kecho
) ' Building modules, stage 2.';
1395 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1397 PHONY
+= modules_install
1398 modules_install
: _emodinst_ _emodinst_post
1400 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1403 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1404 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1406 PHONY
+= _emodinst_post
1407 _emodinst_post
: _emodinst_
1410 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1412 PHONY
+= $(clean-dirs
) clean
1414 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1416 clean: rm-dirs
:= $(MODVERDIR
)
1417 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1420 @echo
' Building external modules.'
1421 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1423 @echo
' modules - default target, build the module(s)'
1424 @echo
' modules_install - install the module'
1425 @echo
' clean - remove generated files in module directory only'
1429 PHONY
+= prepare scripts
1432 endif # KBUILD_EXTMOD
1434 clean: $(clean-dirs
)
1437 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1438 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1441 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1442 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1443 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1444 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1446 # Generate tags for editors
1447 # ---------------------------------------------------------------------------
1448 quiet_cmd_tags
= GEN
$@
1449 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1451 tags TAGS cscope gtags
: FORCE
1454 # Scripts to check various things for consistency
1455 # ---------------------------------------------------------------------------
1457 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1460 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1461 -name
'*.[hcS]' -type f
-print |
sort \
1462 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1465 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1466 -name
'*.[hcS]' -type f
-print |
sort \
1467 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1470 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1473 $(PERL
) $(srctree
)/scripts
/namespace.pl
1476 $(PERL
) $(srctree
)/scripts
/export_report.pl
1478 endif #ifeq ($(config-targets),1)
1479 endif #ifeq ($(mixed-targets),1)
1481 PHONY
+= checkstack kernelrelease kernelversion image_name
1483 # UML needs a little special treatment here. It wants to use the host
1484 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1485 # else wants $(ARCH), including people doing cross-builds, which means
1486 # that $(SUBARCH) doesn't work here.
1488 CHECKSTACK_ARCH
:= $(SUBARCH
)
1490 CHECKSTACK_ARCH
:= $(ARCH
)
1493 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1494 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1497 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1500 @echo
$(KERNELVERSION
)
1503 @echo
$(KBUILD_IMAGE
)
1505 # Clear a bunch of variables before executing the submake
1507 $(Q
)mkdir
-p
$(objtree
)/tools
1508 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(filter --j% -j,$(MAKEFLAGS))" O
=$(objtree
) subdir
=tools
-C
$(src
)/tools
/
1511 $(Q
)mkdir
-p
$(objtree
)/tools
1512 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(filter --j% -j,$(MAKEFLAGS))" O
=$(objtree
) subdir
=tools
-C
$(src
)/tools
/ $*
1515 # ---------------------------------------------------------------------------
1516 # Single targets are compatible with:
1517 # - build with mixed source and output
1518 # - build with separate output dir 'make O=...'
1519 # - external modules
1521 # target-dir => where to store outputfile
1522 # build-dir => directory in kernel source tree to use
1524 ifeq ($(KBUILD_EXTMOD
),)
1525 build-dir
= $(patsubst %/,%,$(dir $@
))
1526 target-dir
= $(dir $@
)
1528 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1529 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1530 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1533 %.s
: %.c prepare scripts FORCE
1534 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1535 %.i
: %.c prepare scripts FORCE
1536 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1537 %.o
: %.c prepare scripts FORCE
1538 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1539 %.lst
: %.c prepare scripts FORCE
1540 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1541 %.s
: %.S prepare scripts FORCE
1542 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1543 %.o
: %.S prepare scripts FORCE
1544 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1545 %.symtypes
: %.c prepare scripts FORCE
1546 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1549 /: prepare scripts FORCE
1551 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1552 $(build
)=$(build-dir
)
1553 # Make sure the latest headers are built for Documentation
1554 Documentation
/: headers_install
1555 %/: prepare scripts FORCE
1557 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1558 $(build
)=$(build-dir
)
1559 %.ko
: prepare scripts FORCE
1561 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1562 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1563 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1565 # FIXME Should go into a make.lib or something
1566 # ===========================================================================
1568 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1569 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1571 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1572 cmd_rmfiles
= rm -f
$(rm-files
)
1574 # Run depmod only if we have System.map and depmod is executable
1575 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1576 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1577 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1579 # Create temporary dir for module support files
1580 # clean it up only when building all modules
1581 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1582 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1584 # read all saved command lines
1586 targets
:= $(wildcard $(sort $(targets
)))
1587 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1589 ifneq ($(cmd_files
),)
1590 $(cmd_files
): ; # Do not try to update included dependency files
1591 include $(cmd_files
)
1594 endif # skip-makefile
1599 # Declare the contents of the .PHONY variable as phony. We keep that
1600 # information in a variable so we can use it in if_changed and friends.