5 NAME
= Shuffling Zombie Juror
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 # Do not use make's built-in rules and variables
14 # (this increases performance and avoids hard-to-debug behaviour);
17 # Avoid funny character set dependencies
21 export LC_COLLATE LC_NUMERIC
23 # Avoid interference with shell env settings
26 # We are using a recursive build, so we need to do a little thinking
27 # to get the ordering right.
29 # Most importantly: sub-Makefiles should only ever modify files in
30 # their own directory. If in some directory we have a dependency on
31 # a file in another dir (which doesn't happen often, but it's often
32 # unavoidable when linking the built-in.o targets which finally
33 # turn into vmlinux), we will call a sub make in that other dir, and
34 # after that we are sure that everything which is in that other dir
37 # The only cases where we need to modify files which have global
38 # effects are thus separated out and done before the recursive
39 # descending is started. They are now explicitly listed as the
43 # ---------------------------------------------------------------------------
45 # Normally, we echo the whole command before executing it. By making
46 # that echo $($(quiet)$(cmd)), we now have the possibility to set
47 # $(quiet) to choose other forms of output instead, e.g.
49 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
50 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
52 # If $(quiet) is empty, the whole command will be printed.
53 # If it is set to "quiet_", only the short version will be printed.
54 # If it is set to "silent_", nothing will be printed at all, since
55 # the variable $(silent_cmd_cc_o_c) doesn't exist.
57 # A simple variant is to prefix commands with $(Q) - that's useful
58 # for commands that shall be hidden in non-verbose mode.
62 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
63 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
65 # To put more focus on warnings, be less verbose as default
66 # Use 'make V=1' to see the full commands
68 ifeq ("$(origin V)", "command line")
75 ifeq ($(KBUILD_VERBOSE
),1)
83 # If the user is running make -s (silent mode), suppress echoing of
86 ifneq ($(filter 4.
%,$(MAKE_VERSION
)),) # make-4
87 ifneq ($(filter %s
,$(firstword x
$(MAKEFLAGS
))),)
91 ifneq ($(filter s
% -s
%,$(MAKEFLAGS
)),)
96 export quiet Q KBUILD_VERBOSE
98 # Call a source code checker (by default, "sparse") as part of the
101 # Use 'make C=1' to enable checking of only re-compiled files.
102 # Use 'make C=2' to enable checking of *all* source files, regardless
103 # of whether they are re-compiled or not.
105 # See the file "Documentation/sparse.txt" for more details, including
106 # where to get the "sparse" utility.
108 ifeq ("$(origin C)", "command line")
109 KBUILD_CHECKSRC
= $(C
)
111 ifndef KBUILD_CHECKSRC
115 # Use make M=dir to specify directory of external module to build
116 # Old syntax make ... SUBDIRS=$PWD is still supported
117 # Setting the environment variable KBUILD_EXTMOD take precedence
119 KBUILD_EXTMOD ?
= $(SUBDIRS
)
122 ifeq ("$(origin M)", "command line")
123 KBUILD_EXTMOD
:= $(M
)
126 # kbuild supports saving output files in a separate directory.
127 # To locate output files in a separate directory two syntaxes are supported.
128 # In both cases the working directory must be the root of the kernel src.
130 # Use "make O=dir/to/store/output/files/"
132 # 2) Set KBUILD_OUTPUT
133 # Set the environment variable KBUILD_OUTPUT to point to the directory
134 # where the output files shall be placed.
135 # export KBUILD_OUTPUT=dir/to/store/output/files/
138 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
142 # KBUILD_SRC is set on invocation of make in OBJ directory
143 # KBUILD_SRC is not intended to be used by the regular user (for now)
144 ifeq ($(KBUILD_SRC
),)
146 # OK, Make called in directory where kernel src resides
147 # Do we want to locate output files in a separate directory?
148 ifeq ("$(origin O)", "command line")
149 KBUILD_OUTPUT
:= $(O
)
152 # That's our default target when none is given on the command line
156 # Cancel implicit rules on top Makefile
157 $(CURDIR
)/Makefile Makefile
: ;
159 ifneq ($(KBUILD_OUTPUT
),)
160 # Invoke a second make in the output directory, passing relevant variables
161 # check that the output directory actually exists
162 saved-output
:= $(KBUILD_OUTPUT
)
163 KBUILD_OUTPUT
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) \
165 $(if
$(KBUILD_OUTPUT
),, \
166 $(error failed to create output directory
"$(saved-output)"))
168 PHONY
+= $(MAKECMDGOALS
) sub-make
170 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
174 $(if
$(KBUILD_VERBOSE
:1=),@
)$(MAKE
) -C
$(KBUILD_OUTPUT
) \
175 KBUILD_SRC
=$(CURDIR
) \
176 KBUILD_EXTMOD
="$(KBUILD_EXTMOD)" -f
$(CURDIR
)/Makefile \
177 $(filter-out _all sub-make
,$(MAKECMDGOALS
))
179 # Leave processing to above invocation of make
181 endif # ifneq ($(KBUILD_OUTPUT),)
182 endif # ifeq ($(KBUILD_SRC),)
184 # We process the rest of the Makefile if this is the final invocation of make
185 ifeq ($(skip-makefile
),)
187 # Do not print "Entering directory ...",
188 # but we want to display it when entering to the output directory
189 # so that IDEs/editors are able to understand relative filenames.
190 MAKEFLAGS
+= --no-print-directory
192 # If building an external module we do not care about the all: rule
193 # but instead _all depend on modules
195 ifeq ($(KBUILD_EXTMOD
),)
201 ifeq ($(KBUILD_SRC
),)
202 # building in the source tree
205 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
206 # building in a subdirectory of the source tree
209 srctree
:= $(KBUILD_SRC
)
216 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
218 export srctree objtree VPATH
221 # SUBARCH tells the usermode build what the underlying arch is. That is set
222 # first, and if a usermode build is happening, the "ARCH=um" on the command
223 # line overrides the setting of ARCH below. If a native build is happening,
224 # then ARCH is assigned, getting whatever value it gets normally, and
225 # SUBARCH is subsequently ignored.
227 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
228 -e s
/sun4u
/sparc64
/ \
229 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
230 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
231 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
232 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ )
234 # Cross compiling and selecting different set of gcc/bin-utils
235 # ---------------------------------------------------------------------------
237 # When performing cross compilation for other architectures ARCH shall be set
238 # to the target architecture. (See arch/* for the possibilities).
239 # ARCH can be set during invocation of make:
241 # Another way is to have ARCH set in the environment.
242 # The default ARCH is the host where make is executed.
244 # CROSS_COMPILE specify the prefix used for all executables used
245 # during compilation. Only gcc and related bin-utils executables
246 # are prefixed with $(CROSS_COMPILE).
247 # CROSS_COMPILE can be set on the command line
248 # make CROSS_COMPILE=ia64-linux-
249 # Alternatively CROSS_COMPILE can be set in the environment.
250 # A third alternative is to store a setting in .config so that plain
251 # "make" in the configured kernel build directory always uses that.
252 # Default value for CROSS_COMPILE is not to prefix executables
253 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
255 CROSS_COMPILE ?
= $(CONFIG_CROSS_COMPILE
:"%"=%)
257 # Architecture as present in compile.h
258 UTS_MACHINE
:= $(ARCH
)
261 # Additional ARCH settings for x86
265 ifeq ($(ARCH
),x86_64
)
269 # Additional ARCH settings for sparc
270 ifeq ($(ARCH
),sparc32
)
273 ifeq ($(ARCH
),sparc64
)
277 # Additional ARCH settings for sh
282 # Additional ARCH settings for tile
283 ifeq ($(ARCH
),tilepro
)
286 ifeq ($(ARCH
),tilegx
)
290 # Where to locate arch specific headers
291 hdr-arch
:= $(SRCARCH
)
293 KCONFIG_CONFIG ?
= .config
294 export KCONFIG_CONFIG
296 # SHELL used by kbuild
297 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
298 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
299 else echo sh
; fi
; fi
)
303 HOSTCFLAGS
= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2
-fomit-frame-pointer
306 ifeq ($(shell $(HOSTCC
) -v
2>&1 | grep
-c
"clang version"), 1)
307 HOSTCFLAGS
+= -Wno-unused-value
-Wno-unused-parameter \
308 -Wno-missing-field-initializers
-fno-delete-null-pointer-checks
311 # Decide whether to build built-in, modular, or both.
312 # Normally, just do built-in.
317 # If we have only "make modules", don't compile built-in objects.
318 # When we're building modules with modversions, we need to consider
319 # the built-in objects during the descend as well, in order to
320 # make sure the checksums are up to date before we record them.
322 ifeq ($(MAKECMDGOALS
),modules
)
323 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
326 # If we have "make <whatever> modules", compile modules
327 # in addition to whatever we do anyway.
328 # Just "make" or "make all" shall build modules as well
330 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
334 ifeq ($(MAKECMDGOALS
),)
338 export KBUILD_MODULES KBUILD_BUILTIN
339 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
342 ifeq ($(shell $(CC
) -v
2>&1 | grep
-c
"clang version"), 1)
350 # Look for make include files relative to root of kernel src
351 MAKEFLAGS
+= --include-dir
=$(srctree
)
353 # We need some generic definitions (do not try to remake the file).
354 $(srctree
)/scripts
/Kbuild.
include: ;
355 include $(srctree
)/scripts
/Kbuild.
include
357 # Make variables (CC, etc...)
358 AS
= $(CROSS_COMPILE
)as
359 LD
= $(CROSS_COMPILE
)ld
360 CC
= $(CROSS_COMPILE
)gcc
362 AR
= $(CROSS_COMPILE
)ar
363 NM
= $(CROSS_COMPILE
)nm
364 STRIP
= $(CROSS_COMPILE
)strip
365 OBJCOPY
= $(CROSS_COMPILE
)objcopy
366 OBJDUMP
= $(CROSS_COMPILE
)objdump
368 GENKSYMS
= scripts
/genksyms
/genksyms
369 INSTALLKERNEL
:= installkernel
370 DEPMOD
= /sbin
/depmod
375 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
376 -Wbitwise
-Wno-return-void
$(CF
)
382 CFLAGS_GCOV
= -fprofile-arcs
-ftest-coverage
385 # Use USERINCLUDE when you must reference the UAPI directories only.
387 -I
$(srctree
)/arch
/$(hdr-arch
)/include/uapi \
388 -Iarch
/$(hdr-arch
)/include/generated
/uapi \
389 -I
$(srctree
)/include/uapi \
390 -Iinclude
/generated
/uapi \
391 -include $(srctree
)/include/linux
/kconfig.h
393 # Use LINUXINCLUDE when you must reference the include/ directory.
394 # Needed to be compatible with the O= option
396 -I
$(srctree
)/arch
/$(hdr-arch
)/include \
397 -Iarch
/$(hdr-arch
)/include/generated \
398 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
402 KBUILD_CPPFLAGS
:= -D__KERNEL__
404 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
405 -fno-strict-aliasing
-fno-common \
406 -Werror-implicit-function-declaration \
409 KBUILD_AFLAGS_KERNEL
:=
410 KBUILD_CFLAGS_KERNEL
:=
411 KBUILD_AFLAGS
:= -D__ASSEMBLY__
412 KBUILD_AFLAGS_MODULE
:= -DMODULE
413 KBUILD_CFLAGS_MODULE
:= -DMODULE
414 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
416 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
417 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
418 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
420 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
421 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
422 export CPP AR NM STRIP OBJCOPY OBJDUMP
423 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
424 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
426 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
427 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
428 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
429 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
430 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
431 export KBUILD_ARFLAGS
433 # When compiling out-of-tree modules, put MODVERDIR in the module
434 # tree rather than in the kernel tree. The kernel tree might
436 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
438 # Files to ignore in find ... statements
440 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
441 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
443 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
444 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
446 # ===========================================================================
447 # Rules shared between *config targets and build targets
449 # Basic helpers built in scripts/
450 PHONY
+= scripts_basic
452 $(Q
)$(MAKE
) $(build
)=scripts
/basic
453 $(Q
)rm -f .tmp_quiet_recordmcount
455 # To avoid any implicit rule to kick in, define an empty command.
456 scripts
/basic
/%: scripts_basic
;
458 PHONY
+= outputmakefile
459 # outputmakefile generates a Makefile in the output directory, if using a
460 # separate output directory. This allows convenient use of make in the
463 ifneq ($(KBUILD_SRC
),)
464 $(Q
)ln
-fsn
$(srctree
) source
465 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
466 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
469 # Support for using generic headers in asm-generic
472 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
473 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
474 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
475 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
477 # To make sure we do not include .config for any of the *config targets
478 # catch them early, and hand them over to scripts/kconfig/Makefile
479 # It is allowed to specify more targets when calling make, including
480 # mixing *config targets and build targets.
481 # For example 'make oldconfig all'.
482 # Detect when mixed targets is specified, and make a second invocation
483 # of make so .config is not included in this case either (for *config).
485 version_h
:= include/generated
/uapi
/linux
/version.h
487 no-dot-config-targets
:= clean mrproper
distclean \
488 cscope gtags TAGS
tags help
%docs
check% coccicheck \
489 $(version_h
) headers_
% archheaders archscripts \
490 kernelversion
%src-pkg
496 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
497 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
502 ifeq ($(KBUILD_EXTMOD
),)
503 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
505 ifneq ($(filter-out config
%config
,$(MAKECMDGOALS
)),)
511 ifeq ($(mixed-targets
),1)
512 # ===========================================================================
513 # We're called with mixed targets (*config and build targets).
514 # Handle them one by one.
516 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
518 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
523 for i in
$(MAKECMDGOALS
); do \
524 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
528 ifeq ($(config-targets
),1)
529 # ===========================================================================
530 # *config targets only - make sure prerequisites are updated, and descend
531 # in scripts/kconfig to make the *config target
533 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
534 # KBUILD_DEFCONFIG may point out an alternative default configuration
535 # used for 'make defconfig'
536 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
537 export KBUILD_DEFCONFIG KBUILD_KCONFIG
539 config
: scripts_basic outputmakefile FORCE
540 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
542 %config
: scripts_basic outputmakefile FORCE
543 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
546 # ===========================================================================
547 # Build targets only - this includes vmlinux, arch specific targets, clean
548 # targets and others. In general all targets except *config targets.
550 ifeq ($(KBUILD_EXTMOD
),)
551 # Additional helpers built in scripts/
552 # Carefully list dependencies so we do not try to build scripts twice
555 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
557 $(Q
)$(MAKE
) $(build
)=$(@
)
559 # Objects we will link into vmlinux / subdirs we need to visit
561 drivers-y
:= drivers
/ sound
/ firmware
/
565 endif # KBUILD_EXTMOD
567 ifeq ($(dot-config
),1)
569 -include include/config
/auto.conf
571 ifeq ($(KBUILD_EXTMOD
),)
572 # Read in dependencies to all Kconfig* files, make sure to run
573 # oldconfig if changes are detected.
574 -include include/config
/auto.conf.cmd
576 # To avoid any implicit rule to kick in, define an empty command
577 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
579 # If .config is newer than include/config/auto.conf, someone tinkered
580 # with it and forgot to run make oldconfig.
581 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
582 # we execute the config step to be sure to catch updated Kconfig files
583 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
584 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
586 # external modules needs include/generated/autoconf.h and include/config/auto.conf
587 # but do not care if they are up-to-date. Use auto.conf to trigger the test
588 PHONY
+= include/config
/auto.conf
590 include/config
/auto.conf
:
591 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
593 echo
>&2 " ERROR: Kernel configuration is invalid."; \
594 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
595 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
599 endif # KBUILD_EXTMOD
602 # Dummy target needed, because used as prerequisite
603 include/config
/auto.conf
: ;
604 endif # $(dot-config)
606 # The all: target is the default when no target is given on the
608 # This allow a user to issue only 'make' to build a kernel including modules
609 # Defaults to vmlinux, but the arch makefile usually adds further targets
612 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
614 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
616 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
617 KBUILD_CFLAGS
+= -Os
$(call cc-disable-warning
,maybe-uninitialized
,)
622 # Tell gcc to never replace conditional load with a non-conditional one
623 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
625 ifdef CONFIG_READABLE_ASM
626 # Disable optimizations that make assembler listings hard to read.
627 # reorder blocks reorders the control in the function
628 # ipa clone creates specialized cloned functions
629 # partial inlining inlines only parts of functions
630 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
631 $(call cc-option
,-fno-ipa-cp-clone
,) \
632 $(call cc-option
,-fno-partial-inlining
)
635 ifneq ($(CONFIG_FRAME_WARN
),0)
636 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
639 # Handle stack protector mode.
641 # Since kbuild can potentially perform two passes (first with the old
642 # .config values and then with updated .config values), we cannot error out
643 # if a desired compiler option is unsupported. If we were to error, kbuild
644 # could never get to the second pass and actually notice that we changed
645 # the option to something that was supported.
647 # Additionally, we don't want to fallback and/or silently change which compiler
648 # flags will be used, since that leads to producing kernels with different
649 # security feature characteristics depending on the compiler used. ("But I
650 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
652 # The middle ground is to warn here so that the failed option is obvious, but
653 # to let the build fail with bad compiler flags so that we can't produce a
654 # kernel when there is a CONFIG and compiler mismatch.
656 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
657 stackp-flag
:= -fstack-protector
658 ifeq ($(call cc-option
, $(stackp-flag
)),)
659 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR
: \
660 -fstack-protector not supported by compiler
)
663 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
664 stackp-flag
:= -fstack-protector-strong
665 ifeq ($(call cc-option
, $(stackp-flag
)),)
666 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG
: \
667 -fstack-protector-strong not supported by compiler
)
670 # Force off for distro compilers that enable stack protector by default.
671 stackp-flag
:= $(call cc-option
, -fno-stack-protector
)
674 KBUILD_CFLAGS
+= $(stackp-flag
)
676 ifeq ($(COMPILER
),clang
)
677 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
678 KBUILD_CPPFLAGS
+= $(call cc-option
,-Wno-unknown-warning-option
,)
679 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-variable
)
680 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
681 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
682 # Quiet clang warning: comparison of unsigned expression < 0 is always false
683 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
684 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
685 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
686 # See modpost pattern 2
687 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
688 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
691 # This warning generated too much noise in a regular build.
692 # Use make W=1 to enable this warning (see scripts/Makefile.build)
693 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
696 ifdef CONFIG_FRAME_POINTER
697 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
699 # Some targets (ARM with Thumb2, for example), can't be built with frame
700 # pointers. For those, we don't have FUNCTION_TRACER automatically
701 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
702 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
703 # -fomit-frame-pointer with FUNCTION_TRACER.
704 ifndef CONFIG_FUNCTION_TRACER
705 KBUILD_CFLAGS
+= -fomit-frame-pointer
709 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
711 ifdef CONFIG_DEBUG_INFO
712 ifdef CONFIG_DEBUG_INFO_SPLIT
713 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
717 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
719 ifdef CONFIG_DEBUG_INFO_DWARF4
720 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
723 ifdef CONFIG_DEBUG_INFO_REDUCED
724 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
725 $(call cc-option
,-fno-var-tracking
)
728 ifdef CONFIG_FUNCTION_TRACER
729 ifdef CONFIG_HAVE_FENTRY
730 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
732 KBUILD_CFLAGS
+= -pg
$(CC_USING_FENTRY
)
733 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
734 ifdef CONFIG_DYNAMIC_FTRACE
735 ifdef CONFIG_HAVE_C_RECORDMCOUNT
736 BUILD_C_RECORDMCOUNT
:= y
737 export BUILD_C_RECORDMCOUNT
742 # We trigger additional mismatches with less inlining
743 ifdef CONFIG_DEBUG_SECTION_MISMATCH
744 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
747 # arch Makefile may override CC so keep this after arch Makefile is included
748 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
749 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
751 # warn about C99 declaration after statement
752 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
754 # disable pointer signed / unsigned warnings in gcc 4.0
755 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
757 # disable invalid "can't wrap" optimizations for signed / pointers
758 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
760 # conserve stack if available
761 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
763 # disallow errors like 'EXPORT_GPL(foo);' with missing header
764 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
766 # require functions to have arguments in prototypes, not empty 'int foo()'
767 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
769 # Prohibit date/time macros, which would make the build non-deterministic
770 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
772 # use the deterministic mode of AR if available
773 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
775 # check for 'asm goto'
776 ifeq ($(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
)), y
)
777 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
780 include $(srctree
)/scripts
/Makefile.extrawarn
782 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
783 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
784 KBUILD_AFLAGS
+= $(KAFLAGS
)
785 KBUILD_CFLAGS
+= $(KCFLAGS
)
787 # Use --build-id when available.
788 LDFLAGS_BUILD_ID
= $(patsubst -Wl
$(comma
)%,%,\
789 $(call cc-ldoption
, -Wl
$(comma
)--build-id
,))
790 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
791 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
793 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
794 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
797 # Default kernel image to build when no specific target is given.
798 # KBUILD_IMAGE may be overruled on the command line or
799 # set in the environment
800 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
802 export KBUILD_IMAGE ?
= vmlinux
805 # INSTALL_PATH specifies where to place the updated kernel and system map
806 # images. Default is /boot, but you can set it to other values
807 export INSTALL_PATH ?
= /boot
810 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
811 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
812 # an argument if needed. Otherwise it defaults to the kernel install path
814 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
817 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
818 # relocations required by build roots. This is not defined in the
819 # makefile but the argument can be passed to make if needed.
822 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
826 # INSTALL_MOD_STRIP, if defined, will cause modules to be
827 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
828 # the default option --strip-debug will be used. Otherwise,
829 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
831 ifdef INSTALL_MOD_STRIP
832 ifeq ($(INSTALL_MOD_STRIP
),1)
833 mod_strip_cmd
= $(STRIP
) --strip-debug
835 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
836 endif # INSTALL_MOD_STRIP=1
839 endif # INSTALL_MOD_STRIP
842 # Select initial ramdisk compression format, default is gzip(1).
843 # This shall be used by the dracut(8) tool while creating an initramfs image.
845 INITRD_COMPRESS-y
:= gzip
846 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
847 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
848 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
849 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
850 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
851 # do not export INITRD_COMPRESS, since we didn't actually
852 # choose a sane default compression above.
853 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
855 ifdef CONFIG_MODULE_SIG_ALL
856 MODSECKEY
= .
/signing_key.priv
857 MODPUBKEY
= .
/signing_key.x509
859 mod_sign_cmd
= perl
$(srctree
)/scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODSECKEY
) $(MODPUBKEY
)
866 ifeq ($(KBUILD_EXTMOD
),)
867 core-y
+= kernel
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
869 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
870 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
871 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
)))
873 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
875 $(core-n
) $(core-
) $(drivers-n
) $(drivers-
) \
876 $(net-n
) $(net-
) $(libs-n
) $(libs-
))))
878 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
879 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
880 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
881 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
882 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
883 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
884 libs-y
:= $(libs-y1
) $(libs-y2
)
886 # Externally visible symbols (used by link-vmlinux.sh)
887 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
888 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y
) $(drivers-y
) $(net-y
)
889 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
890 export LDFLAGS_vmlinux
891 # used by scripts/pacmage/Makefile
892 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools virt
)
894 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
)
896 # Final link of vmlinux
897 cmd_link-vmlinux
= $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
)
898 quiet_cmd_link-vmlinux
= LINK
$@
900 # Include targets which we want to
901 # execute if the rest of the kernel build went well.
902 vmlinux
: scripts
/link-vmlinux.sh
$(vmlinux-deps
) FORCE
903 ifdef CONFIG_HEADERS_CHECK
904 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
907 $(Q
)$(MAKE
) $(build
)=samples
909 ifdef CONFIG_BUILD_DOCSRC
910 $(Q
)$(MAKE
) $(build
)=Documentation
912 +$(call if_changed
,link-vmlinux
)
914 # The actual objects are generated when descending,
915 # make sure no implicit rule kicks in
916 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
918 # Handle descending into subdirectories listed in $(vmlinux-dirs)
919 # Preset locale variables to speed up the build process. Limit locale
920 # tweaks to this spot to avoid wrong language settings when running
921 # make menuconfig etc.
922 # Error messages still appears in the original language
924 PHONY
+= $(vmlinux-dirs
)
925 $(vmlinux-dirs
): prepare scripts
926 $(Q
)$(MAKE
) $(build
)=$@
928 define filechk_kernel.release
929 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
932 # Store (new) KERNELRELEASE string in include/config/kernel.release
933 include/config
/kernel.release
: include/config
/auto.conf FORCE
934 $(call filechk
,kernel.release
)
937 # Things we need to do before we recursively start building the kernel
938 # or the modules are listed in "prepare".
939 # A multi level approach is used. prepareN is processed before prepareN-1.
940 # archprepare is used in arch Makefiles and when processed asm symlink,
941 # version.h and scripts_basic is processed / created.
943 # Listed in dependency order
944 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
946 # prepare3 is used to check if we are building in a separate output directory,
948 # 1) Check that make has not been executed in the kernel src $(srctree)
949 prepare3
: include/config
/kernel.release
950 ifneq ($(KBUILD_SRC
),)
951 @
$(kecho
) ' Using $(srctree) as source for kernel'
952 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
953 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
954 echo
>&2 " in the '$(srctree)' directory.";\
959 # prepare2 creates a makefile if using a separate output directory
960 prepare2
: prepare3 outputmakefile asm-generic
962 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
963 include/config
/auto.conf
966 archprepare
: archheaders archscripts prepare1 scripts_basic
968 prepare0
: archprepare FORCE
969 $(Q
)$(MAKE
) $(build
)=.
971 # All the preparing..
974 # Generate some files
975 # ---------------------------------------------------------------------------
977 # KERNELRELEASE can change from a few different places, meaning version.h
978 # needs to be updated, so this check is forced on all builds
981 define filechk_utsrelease.h
982 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
983 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
986 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
989 define filechk_version.h
990 (echo \
#define LINUX_VERSION_CODE $(shell \
991 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
992 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
995 $(version_h
): $(srctree
)/Makefile FORCE
996 $(call filechk
,version.h
)
998 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
999 $(call filechk
,utsrelease.h
)
1003 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1004 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1006 # ---------------------------------------------------------------------------
1010 @echo
'*** Warning: make $@ is unnecessary now.'
1012 # ---------------------------------------------------------------------------
1014 INSTALL_FW_PATH
=$(INSTALL_MOD_PATH
)/lib
/firmware
1015 export INSTALL_FW_PATH
1017 PHONY
+= firmware_install
1018 firmware_install
: FORCE
1019 @mkdir
-p
$(objtree
)/firmware
1020 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_install
1022 # ---------------------------------------------------------------------------
1025 #Default location for installed headers
1026 export INSTALL_HDR_PATH
= $(objtree
)/usr
1028 hdr-inst
:= -rR
-f
$(srctree
)/scripts
/Makefile.headersinst obj
1030 # If we do an all arch process set dst to asm-$(hdr-arch)
1031 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/asm-
$(hdr-arch
), dst
=include/asm
)
1033 PHONY
+= archheaders
1036 PHONY
+= archscripts
1040 __headers
: $(version_h
) scripts_basic asm-generic archheaders archscripts FORCE
1041 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1043 PHONY
+= headers_install_all
1044 headers_install_all
:
1045 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1047 PHONY
+= headers_install
1048 headers_install
: __headers
1049 $(if
$(wildcard $(srctree
)/arch
/$(hdr-arch
)/include/uapi
/asm
/Kbuild
),, \
1050 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1051 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1052 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
)
1054 PHONY
+= headers_check_all
1055 headers_check_all
: headers_install_all
1056 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1058 PHONY
+= headers_check
1059 headers_check
: headers_install
1060 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi HDRCHECK
=1
1061 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
) HDRCHECK
=1
1063 # ---------------------------------------------------------------------------
1068 $(Q
)$(MAKE
) -C tools
/testing
/selftests run_tests
1070 # ---------------------------------------------------------------------------
1073 ifdef CONFIG_MODULES
1075 # By default, build modules as well
1081 # A module can be listed more than once in obj-m resulting in
1082 # duplicate lines in modules.order files. Those are removed
1083 # using awk while concatenating to the final file.
1086 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1087 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1088 @
$(kecho
) ' Building modules, stage 2.';
1089 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1090 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modbuild
1092 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1093 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1095 %/modules.builtin
: include/config
/auto.conf
1096 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1099 # Target to prepare building external modules
1100 PHONY
+= modules_prepare
1101 modules_prepare
: prepare scripts
1103 # Target to install modules
1104 PHONY
+= modules_install
1105 modules_install
: _modinst_ _modinst_post
1109 @
rm -rf
$(MODLIB
)/kernel
1110 @
rm -f
$(MODLIB
)/source
1111 @mkdir
-p
$(MODLIB
)/kernel
1112 @ln
-s
`cd $(srctree) && /bin/pwd` $(MODLIB
)/source
1113 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1114 rm -f
$(MODLIB
)/build
; \
1115 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1117 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1118 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1119 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1121 # This depmod is only for convenience to give the initial
1122 # boot a modules.dep even before / is mounted read-write. However the
1123 # boot script depmod is the master version.
1124 PHONY
+= _modinst_post
1125 _modinst_post
: _modinst_
1126 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modinst
1129 ifeq ($(CONFIG_MODULE_SIG
), y
)
1130 PHONY
+= modules_sign
1132 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1135 else # CONFIG_MODULES
1137 # Modules not configured
1138 # ---------------------------------------------------------------------------
1140 modules modules_install
: FORCE
1142 @echo
>&2 "The present kernel configuration has modules disabled."
1143 @echo
>&2 "Type 'make config' and enable loadable module support."
1144 @echo
>&2 "Then build a kernel with module support enabled."
1148 endif # CONFIG_MODULES
1151 # Cleaning is done on three levels.
1152 # make clean Delete most generated files
1153 # Leave enough to build external modules
1154 # make mrproper Delete the current configuration, and all generated files
1155 # make distclean Remove editor backup files, patch leftover files and the like
1157 # Directories & files removed with 'make clean'
1158 CLEAN_DIRS
+= $(MODVERDIR
)
1160 # Directories & files removed with 'make mrproper'
1161 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1162 arch
/*/include/generated .tmp_objdiff
1163 MRPROPER_FILES
+= .config .config.old .version .old_version
$(version_h
) \
1164 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1165 signing_key.priv signing_key.x509 x509.genkey \
1166 extra_certificates signing_key.x509.keyid \
1167 signing_key.x509.signer
include/linux
/version.h
1169 # clean - Delete most, but leave enough to build external modules
1171 clean: rm-dirs
:= $(CLEAN_DIRS
)
1172 clean: rm-files
:= $(CLEAN_FILES
)
1173 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1175 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1177 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1180 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1182 clean: archclean vmlinuxclean
1184 # mrproper - Delete all generated files, including .config
1186 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1187 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1188 mrproper-dirs
:= $(addprefix _mrproper_
,Documentation
/DocBook scripts
)
1190 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1192 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1194 mrproper
: clean archmrproper
$(mrproper-dirs
)
1203 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1204 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1205 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'.*.orig' \
1206 -o
-name
'.*.rej' -o
-name
'*%' -o
-name
'core' \
) \
1207 -type f
-print | xargs
rm -f
1210 # Packaging of the kernel to various formats
1211 # ---------------------------------------------------------------------------
1212 # rpm target kept for backward compatibility
1213 package-dir
:= scripts
/package
1216 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1217 %pkg
: include/config
/kernel.release FORCE
1218 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1219 rpm
: include/config
/kernel.release FORCE
1220 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1223 # Brief documentation of the typical targets used
1224 # ---------------------------------------------------------------------------
1226 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1227 boards
:= $(notdir $(boards
))
1228 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1229 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1232 @echo
'Cleaning targets:'
1233 @echo
' clean - Remove most generated files but keep the config and'
1234 @echo
' enough build support to build external modules'
1235 @echo
' mrproper - Remove all generated files + config + various backup files'
1236 @echo
' distclean - mrproper + remove editor backup and patch files'
1238 @echo
'Configuration targets:'
1239 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1241 @echo
'Other generic targets:'
1242 @echo
' all - Build all targets marked with [*]'
1243 @echo
'* vmlinux - Build the bare kernel'
1244 @echo
'* modules - Build all modules'
1245 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1246 @echo
' firmware_install- Install all firmware to INSTALL_FW_PATH'
1247 @echo
' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1248 @echo
' dir/ - Build all files in dir and below'
1249 @echo
' dir/file.[oisS] - Build specified target only'
1250 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1251 @echo
' (requires a recent binutils and recent build (System.map))'
1252 @echo
' dir/file.ko - Build module including final link'
1253 @echo
' modules_prepare - Set up for building external modules'
1254 @echo
' tags/TAGS - Generate tags file for editors'
1255 @echo
' cscope - Generate cscope index'
1256 @echo
' gtags - Generate GNU GLOBAL index'
1257 @echo
' kernelrelease - Output the release version string (use with make -s)'
1258 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1259 @echo
' image_name - Output the image name (use with make -s)'
1260 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1261 echo
' (default: $(INSTALL_HDR_PATH))'; \
1263 @echo
'Static analysers'
1264 @echo
' checkstack - Generate a list of stack hogs'
1265 @echo
' namespacecheck - Name space analysis on compiled kernel'
1266 @echo
' versioncheck - Sanity check on version.h usage'
1267 @echo
' includecheck - Check for duplicate included header files'
1268 @echo
' export_report - List the usages of all exported symbols'
1269 @echo
' headers_check - Sanity check on exported headers'
1270 @echo
' headerdep - Detect inclusion cycles in headers'
1271 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.help checker-help
1273 @echo
'Kernel selftest'
1274 @echo
' kselftest - Build and run kernel selftest (run as root)'
1275 @echo
' Build, install, and boot kernel before'
1276 @echo
' running kselftest on it'
1278 @echo
'Kernel packaging:'
1279 @
$(MAKE
) $(build
)=$(package-dir
) help
1281 @echo
'Documentation targets:'
1282 @
$(MAKE
) -f
$(srctree
)/Documentation
/DocBook
/Makefile dochelp
1284 @echo
'Architecture specific targets ($(SRCARCH)):'
1285 @
$(if
$(archhelp
),$(archhelp
),\
1286 echo
' No architecture specific help defined for $(SRCARCH)')
1289 $(foreach b
, $(boards
), \
1290 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1292 @
$(if
$(board-dirs
), \
1293 $(foreach b
, $(board-dirs
), \
1294 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1295 printf
" %-16s - Show all of the above\\n" help-boards
; \
1298 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1299 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1300 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1301 @echo
' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1302 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1303 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1304 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1305 @echo
' 1: warnings which may be relevant and do not occur too often'
1306 @echo
' 2: warnings which occur quite often but may still be relevant'
1307 @echo
' 3: more obscure warnings, can most likely be ignored'
1308 @echo
' Multiple levels can be combined with W=12 or W=123'
1310 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1311 @echo
'For further info see the ./README file'
1314 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1316 help-boards
: $(help-board-dirs
)
1318 boards-per-dir
= $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
))
1320 $(help-board-dirs
): help-
%:
1321 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1322 @
$(if
$(boards-per-dir
), \
1323 $(foreach b
, $(boards-per-dir
), \
1324 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1328 # Documentation targets
1329 # ---------------------------------------------------------------------------
1330 %docs
: scripts_basic FORCE
1331 $(Q
)$(MAKE
) $(build
)=scripts build_docproc
1332 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
1334 else # KBUILD_EXTMOD
1337 # External module support.
1338 # When building external modules the kernel used as basis is considered
1339 # read-only, and no consistency checks are made and the make
1340 # system is not used on the basis kernel. If updates are required
1341 # in the basis kernel ordinary make commands (without M=...) must
1344 # The following are the only valid targets when building external
1346 # make M=dir clean Delete all automatically generated files
1347 # make M=dir modules Make all modules in specified dir
1348 # make M=dir Same as 'make M=dir modules'
1349 # make M=dir modules_install
1350 # Install the modules built in the module directory
1351 # Assumes install directory is already created
1353 # We are always building modules
1355 PHONY
+= crmodverdir
1359 PHONY
+= $(objtree
)/Module.symvers
1360 $(objtree
)/Module.symvers
:
1361 @
test -e
$(objtree
)/Module.symvers ||
( \
1363 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1364 echo
" is missing; modules will have no dependencies and modversions."; \
1367 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1368 PHONY
+= $(module-dirs
) modules
1369 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1370 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1372 modules
: $(module-dirs
)
1373 @
$(kecho
) ' Building modules, stage 2.';
1374 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1376 PHONY
+= modules_install
1377 modules_install
: _emodinst_ _emodinst_post
1379 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1382 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1383 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1385 PHONY
+= _emodinst_post
1386 _emodinst_post
: _emodinst_
1389 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1391 PHONY
+= $(clean-dirs
) clean
1393 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1395 clean: rm-dirs
:= $(MODVERDIR
)
1396 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1399 @echo
' Building external modules.'
1400 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1402 @echo
' modules - default target, build the module(s)'
1403 @echo
' modules_install - install the module'
1404 @echo
' clean - remove generated files in module directory only'
1408 PHONY
+= prepare scripts
1411 endif # KBUILD_EXTMOD
1413 clean: $(clean-dirs
)
1416 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1417 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1420 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1421 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1422 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1423 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1425 # Generate tags for editors
1426 # ---------------------------------------------------------------------------
1427 quiet_cmd_tags
= GEN
$@
1428 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1430 tags TAGS cscope gtags
: FORCE
1433 # Scripts to check various things for consistency
1434 # ---------------------------------------------------------------------------
1436 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1439 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1440 -name
'*.[hcS]' -type f
-print |
sort \
1441 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1444 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1445 -name
'*.[hcS]' -type f
-print |
sort \
1446 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1449 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1452 $(PERL
) $(srctree
)/scripts
/namespace.pl
1455 $(PERL
) $(srctree
)/scripts
/export_report.pl
1457 endif #ifeq ($(config-targets),1)
1458 endif #ifeq ($(mixed-targets),1)
1460 PHONY
+= checkstack kernelrelease kernelversion image_name
1462 # UML needs a little special treatment here. It wants to use the host
1463 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1464 # else wants $(ARCH), including people doing cross-builds, which means
1465 # that $(SUBARCH) doesn't work here.
1467 CHECKSTACK_ARCH
:= $(SUBARCH
)
1469 CHECKSTACK_ARCH
:= $(ARCH
)
1472 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1473 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1476 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1479 @echo
$(KERNELVERSION
)
1482 @echo
$(KBUILD_IMAGE
)
1484 # Clear a bunch of variables before executing the submake
1486 $(Q
)mkdir
-p
$(objtree
)/tools
1487 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(filter --j% -j,$(MAKEFLAGS))" O
=$(objtree
) subdir
=tools
-C
$(src
)/tools
/
1490 $(Q
)mkdir
-p
$(objtree
)/tools
1491 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(filter --j% -j,$(MAKEFLAGS))" O
=$(objtree
) subdir
=tools
-C
$(src
)/tools
/ $*
1494 # ---------------------------------------------------------------------------
1495 # Single targets are compatible with:
1496 # - build with mixed source and output
1497 # - build with separate output dir 'make O=...'
1498 # - external modules
1500 # target-dir => where to store outputfile
1501 # build-dir => directory in kernel source tree to use
1503 ifeq ($(KBUILD_EXTMOD
),)
1504 build-dir
= $(patsubst %/,%,$(dir $@
))
1505 target-dir
= $(dir $@
)
1507 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1508 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1509 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1512 %.s
: %.c prepare scripts FORCE
1513 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1514 %.i
: %.c prepare scripts FORCE
1515 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1516 %.o
: %.c prepare scripts FORCE
1517 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1518 %.lst
: %.c prepare scripts FORCE
1519 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1520 %.s
: %.S prepare scripts FORCE
1521 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1522 %.o
: %.S prepare scripts FORCE
1523 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1524 %.symtypes
: %.c prepare scripts FORCE
1525 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1528 /: prepare scripts FORCE
1530 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1531 $(build
)=$(build-dir
)
1532 %/: prepare scripts FORCE
1534 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1535 $(build
)=$(build-dir
)
1536 %.ko
: prepare scripts FORCE
1538 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1539 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1540 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1542 # FIXME Should go into a make.lib or something
1543 # ===========================================================================
1545 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1546 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1548 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1549 cmd_rmfiles
= rm -f
$(rm-files
)
1551 # Run depmod only if we have System.map and depmod is executable
1552 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1553 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1554 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1556 # Create temporary dir for module support files
1557 # clean it up only when building all modules
1558 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1559 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1561 # read all saved command lines
1563 targets
:= $(wildcard $(sort $(targets
)))
1564 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1566 ifneq ($(cmd_files
),)
1567 $(cmd_files
): ; # Do not try to update included dependency files
1568 include $(cmd_files
)
1571 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1573 # $(Q)$(MAKE) $(clean)=dir
1574 clean := -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.
clean obj
1576 endif # skip-makefile
1581 # Declare the contents of the .PHONY variable as phony. We keep that
1582 # information in a variable so we can use it in if_changed and friends.