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 print "Entering directory ..."
14 MAKEFLAGS
+= --no-print-directory
16 # We are using a recursive build, so we need to do a little thinking
17 # to get the ordering right.
19 # Most importantly: sub-Makefiles should only ever modify files in
20 # their own directory. If in some directory we have a dependency on
21 # a file in another dir (which doesn't happen often, but it's often
22 # unavoidable when linking the built-in.o targets which finally
23 # turn into busybox), we will call a sub make in that other dir, and
24 # after that we are sure that everything which is in that other dir
27 # The only cases where we need to modify files which have global
28 # effects are thus separated out and done before the recursive
29 # descending is started. They are now explicitly listed as the
32 # To put more focus on warnings, be less verbose as default
33 # Use 'make V=1' to see the full commands
36 ifeq ("$(origin V)", "command line")
44 # Call sparse as part of compilation of C files
45 # Use 'make C=1' to enable sparse checking
48 ifeq ("$(origin C)", "command line")
49 KBUILD_CHECKSRC
= $(C
)
52 ifndef KBUILD_CHECKSRC
56 # Use make M=dir to specify directory of external module to build
57 # Old syntax make ... SUBDIRS=$PWD is still supported
58 # Setting the environment variable KBUILD_EXTMOD take precedence
60 KBUILD_EXTMOD ?
= $(SUBDIRS
)
63 ifeq ("$(origin M)", "command line")
69 # kbuild supports saving output files in a separate directory.
70 # To locate output files in a separate directory two syntaxes are supported.
71 # In both cases the working directory must be the root of the kernel src.
73 # Use "make O=dir/to/store/output/files/"
75 # 2) Set KBUILD_OUTPUT
76 # Set the environment variable KBUILD_OUTPUT to point to the directory
77 # where the output files shall be placed.
78 # export KBUILD_OUTPUT=dir/to/store/output/files/
81 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
85 # KBUILD_SRC is set on invocation of make in OBJ directory
86 # KBUILD_SRC is not intended to be used by the regular user (for now)
89 # OK, Make called in directory where kernel src resides
90 # Do we want to locate output files in a separate directory?
92 ifeq ("$(origin O)", "command line")
97 # That's our default target when none is given on the command line
101 ifneq ($(KBUILD_OUTPUT
),)
102 # Invoke a second make in the output directory, passing relevant variables
103 # check that the output directory actually exists
104 saved-output
:= $(KBUILD_OUTPUT
)
105 KBUILD_OUTPUT
:= $(shell cd
$(KBUILD_OUTPUT
) && /bin
/pwd
)
106 $(if
$(KBUILD_OUTPUT
),, \
107 $(error output directory
"$(saved-output)" does not exist
))
109 PHONY
+= $(MAKECMDGOALS
)
111 $(filter-out _all
,$(MAKECMDGOALS
)) _all
:
112 $(if
$(KBUILD_VERBOSE
:1=),@
)$(MAKE
) -C
$(KBUILD_OUTPUT
) \
113 KBUILD_SRC
=$(CURDIR
) \
114 KBUILD_EXTMOD
="$(KBUILD_EXTMOD)" -f
$(CURDIR
)/Makefile
$@
116 # Leave processing to above invocation of make
118 endif # ifneq ($(KBUILD_OUTPUT),)
119 endif # ifeq ($(KBUILD_SRC),)
121 # We process the rest of the Makefile if this is the final invocation of make
122 ifeq ($(skip-makefile
),)
124 # If building an external module we do not care about the all: rule
125 # but instead _all depend on modules
127 ifeq ($(KBUILD_EXTMOD
),)
133 srctree
:= $(if
$(KBUILD_SRC
),$(KBUILD_SRC
),$(CURDIR
))
135 # FIXME - TOPDIR is obsolete, use srctree/objtree
140 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
142 export srctree objtree VPATH TOPDIR
145 # Cross compiling and selecting different set of gcc/bin-utils
146 # ---------------------------------------------------------------------------
148 # When performing cross compilation for other architectures ARCH shall be set
149 # to the target architecture. (See arch/* for the possibilities).
150 # ARCH can be set during invocation of make:
152 # Another way is to have ARCH set in the environment.
153 # The default ARCH is the host where make is executed.
155 # CROSS_COMPILE specify the prefix used for all executables used
156 # during compilation. Only gcc and related bin-utils executables
157 # are prefixed with $(CROSS_COMPILE).
158 # CROSS_COMPILE can be set on the command line
159 # make CROSS_COMPILE=ia64-linux-
160 # Alternatively CROSS_COMPILE can be set in the environment.
161 # Default value for CROSS_COMPILE is not to prefix executables
162 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
165 # bbox: we may have CONFIG_CROSS_COMPILER_PREFIX in .config,
166 # and it has not been included yet... thus using an awkward syntax.
167 ifeq ($(CROSS_COMPILE
),)
168 CROSS_COMPILE
:= $(shell grep ^CONFIG_CROSS_COMPILER_PREFIX .config
2>/dev
/null
)
169 CROSS_COMPILE
:= $(subst CONFIG_CROSS_COMPILER_PREFIX
=,,$(CROSS_COMPILE
))
170 CROSS_COMPILE
:= $(subst ",,$(CROSS_COMPILE))
174 # SUBARCH tells the usermode build what the underlying arch is. That is set
175 # first, and if a usermode build is happening, the "ARCH=um" on the command
176 # line overrides the setting of ARCH below. If a native build is happening,
177 # then ARCH is assigned, getting whatever value it gets normally, and
178 # SUBARCH is subsequently ignored.
180 ifneq ($(CROSS_COMPILE
),)
181 SUBARCH
:= $(shell echo
$(CROSS_COMPILE
) | cut
-d-
-f1
)
183 SUBARCH
:= $(shell uname
-m
)
185 SUBARCH
:= $(shell echo
$(SUBARCH
) | sed
-e s
/i
.86/i386
/ -e s
/sun4u
/sparc64
/ \
186 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
187 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
188 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ )
192 # Architecture as present in compile.h
193 UTS_MACHINE
:= $(ARCH
)
195 # SHELL used by kbuild
196 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
197 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
198 else echo sh
; fi
; fi
)
200 # Decide whether to build built-in, modular, or both.
201 # Normally, just do built-in.
206 # If we have only "make modules", don't compile built-in objects.
207 # When we're building modules with modversions, we need to consider
208 # the built-in objects during the descend as well, in order to
209 # make sure the checksums are uptodate before we record them.
211 ifeq ($(MAKECMDGOALS
),modules
)
212 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
215 # If we have "make <whatever> modules", compile modules
216 # in addition to whatever we do anyway.
217 # Just "make" or "make all" shall build modules as well
219 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
223 ifeq ($(MAKECMDGOALS
),)
227 export KBUILD_MODULES KBUILD_BUILTIN
228 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
231 # ---------------------------------------------------------------------------
233 # Normally, we echo the whole command before executing it. By making
234 # that echo $($(quiet)$(cmd)), we now have the possibility to set
235 # $(quiet) to choose other forms of output instead, e.g.
237 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
238 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
240 # If $(quiet) is empty, the whole command will be printed.
241 # If it is set to "quiet_", only the short version will be printed.
242 # If it is set to "silent_", nothing wil be printed at all, since
243 # the variable $(silent_cmd_cc_o_c) doesn't exist.
245 # A simple variant is to prefix commands with $(Q) - that's useful
246 # for commands that shall be hidden in non-verbose mode.
250 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
251 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
253 ifeq ($(KBUILD_VERBOSE
),1)
261 # If the user is running make -s (silent mode), suppress echoing of
264 ifneq ($(findstring s
,$(MAKEFLAGS
)),)
268 export quiet Q KBUILD_VERBOSE
271 # Look for make include files relative to root of kernel src
272 MAKEFLAGS
+= --include-dir
=$(srctree
)
278 # We need some generic definitions
279 include $(srctree
)/scripts
/Kbuild.
include
281 HOSTCFLAGS
+= $(call hostcc-option
,-Wall
-Wstrict-prototypes
-O2
-fomit-frame-pointer
,)
284 # For maximum performance (+ possibly random breakage, uncomment
289 # Make variables (CC, etc...)
291 AS
= $(CROSS_COMPILE
)as
292 CC
= $(CROSS_COMPILE
)gcc
295 AR
= $(CROSS_COMPILE
)ar
296 NM
= $(CROSS_COMPILE
)nm
297 STRIP
= $(CROSS_COMPILE
)strip
298 OBJCOPY
= $(CROSS_COMPILE
)objcopy
299 OBJDUMP
= $(CROSS_COMPILE
)objdump
301 GENKSYMS
= scripts
/genksyms
/genksyms
302 DEPMOD
= /sbin
/depmod
303 KALLSYMS
= scripts
/kallsyms
307 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__
-Wbitwise
$(CF
)
309 CFLAGS_MODULE
= $(MODFLAGS
)
310 AFLAGS_MODULE
= $(MODFLAGS
)
316 # Use LINUXINCLUDE when you must reference the include/ directory.
317 # Needed to be compatible with the O= option
319 # Added only to final link stage of busybox binary
320 CFLAGS_busybox
:= $(CFLAGS_busybox
)
321 CPPFLAGS
:= $(CPPFLAGS
)
323 LDFLAGS
:= $(LDFLAGS
)
326 # Read KERNELRELEASE from .kernelrelease (if it exists)
327 KERNELRELEASE
= $(shell cat .kernelrelease
2> /dev
/null
)
328 KERNELVERSION
= $(VERSION
).
$(PATCHLEVEL
).
$(SUBLEVEL
)$(EXTRAVERSION
)
330 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
331 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
332 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
333 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
335 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
336 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
337 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
340 # When compiling out-of-tree modules, put MODVERDIR in the module
341 # tree rather than in the kernel tree. The kernel tree might
343 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
345 # Files to ignore in find ... statements
347 RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o
-name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) -prune
-o
348 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn
--exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
350 # ===========================================================================
351 # Rules shared between *config targets and build targets
353 # Basic helpers built in scripts/
354 PHONY
+= scripts_basic
356 $(Q
)$(MAKE
) $(build
)=scripts
/basic
358 # To avoid any implicit rule to kick in, define an empty command.
359 scripts
/basic
/%: scripts_basic
;
361 PHONY
+= outputmakefile
362 # outputmakefile generates a Makefile in the output directory, if using a
363 # separate output directory. This allows convenient use of make in the
366 ifneq ($(KBUILD_SRC
),)
367 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
368 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
371 # To make sure we do not include .config for any of the *config targets
372 # catch them early, and hand them over to scripts/kconfig/Makefile
373 # It is allowed to specify more targets when calling make, including
374 # mixing *config targets and build targets.
375 # For example 'make oldconfig all'.
376 # Detect when mixed targets is specified, and make a second invocation
377 # of make so .config is not included in this case either (for *config).
379 no-dot-config-targets
:= clean mrproper
distclean \
380 cscope TAGS
tags help
%docs
381 #bbox# check% is removed from above
387 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
388 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
393 ifeq ($(KBUILD_EXTMOD
),)
394 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
396 ifneq ($(filter-out config
%config
,$(MAKECMDGOALS
)),)
402 ifeq ($(mixed-targets
),1)
403 # ===========================================================================
404 # We're called with mixed targets (*config and build targets).
405 # Handle them one by one.
408 $(Q
)$(MAKE
) -C
$(srctree
) KBUILD_SRC
= $@
411 ifeq ($(config-targets
),1)
412 # ===========================================================================
413 # *config targets only - make sure prerequisites are updated, and descend
414 # in scripts/kconfig to make the *config target
416 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
417 # KBUILD_DEFCONFIG may point out an alternative default configuration
418 # used for 'make defconfig'
419 -include $(srctree
)/arch
/$(ARCH
)/Makefile
420 export KBUILD_DEFCONFIG
422 config
%config
: scripts_basic outputmakefile FORCE
424 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
425 $(Q
)$(MAKE
) -C
$(srctree
) KBUILD_SRC
= .kernelrelease
428 # ===========================================================================
429 # Build targets only - this includes busybox, arch specific targets, clean
430 # targets and others. In general all targets except *config targets.
432 ifeq ($(KBUILD_EXTMOD
),)
433 # Additional helpers built in scripts/
434 # Carefully list dependencies so we do not try to build scripts twice
437 scripts
: scripts_basic
include/config
/MARKER
438 $(Q
)$(MAKE
) $(build
)=$(@
)
440 scripts_basic
: include/autoconf.h
442 # Objects we will link into busybox / subdirs we need to visit
448 archival
/libunarchive
/ \
451 coreutils
/libcoreutils
/ \
464 networking
/libiproute
/ \
473 util-linux
/volume_id
/ \
475 endif # KBUILD_EXTMOD
477 ifeq ($(dot-config
),1)
478 # In this section, we need .config
480 # Read in dependencies to all Kconfig* files, make sure to run
481 # oldconfig if changes are detected.
486 # If .config needs to be updated, it will be done via the dependency
487 # that autoconf has on .config.
488 # To avoid any implicit rule to kick in, define an empty command
489 .config .kconfig.d
: ;
491 # Now we can define CFLAGS etc according to .config
492 include $(srctree
)/Makefile.flags
494 # If .config is newer than include/autoconf.h, someone tinkered
495 # with it and forgot to run make oldconfig.
496 # If kconfig.d is missing then we are probarly in a cleaned tree so
497 # we execute the config step to be sure to catch updated Kconfig files
498 include/autoconf.h
: .kconfig.d .config
499 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
502 # Dummy target needed, because used as prerequisite
503 include/autoconf.h
: ;
506 # The all: target is the default when no target is given on the
508 # This allow a user to issue only 'make' to build a kernel including modules
509 # Defaults busybox but it is usually overridden in the arch makefile
512 -include $(srctree
)/arch
/$(ARCH
)/Makefile
514 # arch Makefile may override CC so keep this after arch Makefile is included
515 #bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
516 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
518 # Default kernel image to build when no specific target is given.
519 # KBUILD_IMAGE may be overruled on the commandline or
520 # set in the environment
521 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
523 export KBUILD_IMAGE ?
= busybox
526 # INSTALL_PATH specifies where to place the updated kernel and system map
527 # images. Default is /boot, but you can set it to other values
528 export INSTALL_PATH ?
= /boot
531 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
532 # relocations required by build roots. This is not defined in the
533 # makefile but the arguement can be passed to make if needed.
536 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
540 ifeq ($(KBUILD_EXTMOD
),)
541 busybox-dirs
:= $(patsubst %/,%,$(filter %/, $(core-y
) $(core-m
) $(libs-y
) $(libs-m
)))
543 busybox-alldirs
:= $(sort $(busybox-dirs
) $(patsubst %/,%,$(filter %/, \
544 $(core-n
) $(core-
) $(libs-n
) $(libs-
) \
547 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
548 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
549 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
550 libs-y
:= $(libs-y1
) $(libs-y2
)
553 # ---------------------------------------------------------------------------
554 # busybox is build from the objects selected by $(busybox-init) and
555 # $(busybox-main). Most are built-in.o files from top-level directories
556 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
557 # Ordering when linking is important, and $(busybox-init) must be first.
562 # +-< $(busybox-init)
563 # | +--< init/version.o + more
565 # +--< $(busybox-main)
566 # | +--< driver/built-in.o mm/built-in.o + more
568 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
570 # busybox version (uname -v) cannot be updated during normal
571 # descending-into-subdirs phase since we do not yet know if we need to
573 # Therefore this step is delayed until just before final link of busybox -
574 # except in the kallsyms case where it is done just before adding the
575 # symbols to the kernel.
577 # System.map is generated to document addresses of all kernel symbols
579 busybox-all
:= $(core-y
) $(libs-y
)
581 # Rule to link busybox - also used during CONFIG_KALLSYMS
582 # May be overridden by arch/$(ARCH)/Makefile
583 quiet_cmd_busybox__ ?
= LINK
$@
584 cmd_busybox__ ?
= $(srctree
)/scripts
/trylink \
587 "$(CFLAGS) $(CFLAGS_busybox)" \
588 "$(LDFLAGS) $(EXTRA_LDFLAGS)" \
593 # Generate System.map
594 quiet_cmd_sysmap
= SYSMAP
595 cmd_sysmap
= $(CONFIG_SHELL
) $(srctree
)/scripts
/mksysmap
598 # If CONFIG_KALLSYMS is set .version is already updated
599 # Generate System.map and verify that the content is consistent
600 # Use + in front of the busybox_version rule to silent warning with make -j2
601 # First command is ':' to allow us to use + in front of the rule
602 define rule_busybox__
604 $(call cmd
,busybox__
)
605 $(Q
)echo
'cmd_$@ := $(cmd_busybox__)' > $(@D
)/.
$(@F
).cmd
609 ifdef CONFIG_KALLSYMS
610 # Generate section listing all symbols and add it into busybox $(kallsyms.o)
611 # It's a three stage process:
612 # o .tmp_busybox1 has all symbols and sections, but __kallsyms is
614 # Running kallsyms on that gives us .tmp_kallsyms1.o with
615 # the right size - busybox version (uname -v) is updated during this step
616 # o .tmp_busybox2 now has a __kallsyms section of the right size,
617 # but due to the added section, some addresses have shifted.
618 # From here, we generate a correct .tmp_kallsyms2.o
619 # o The correct .tmp_kallsyms2.o is linked into the final busybox.
620 # o Verify that the System.map from busybox matches the map from
621 # .tmp_busybox2, just in case we did not generate kallsyms correctly.
622 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
623 # .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a
624 # temporary bypass to allow the kernel to be built while the
625 # maintainers work out what went wrong with kallsyms.
627 ifdef CONFIG_KALLSYMS_EXTRA_PASS
633 kallsyms.o
:= .tmp_kallsyms
$(last_kallsyms
).o
635 define verify_kallsyms
636 $(Q
)$(if
$($(quiet
)cmd_sysmap
), \
637 echo
' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
638 $(cmd_sysmap
) .tmp_busybox
$(last_kallsyms
) .tmp_System.map
639 $(Q
)cmp
-s System.map .tmp_System.map || \
640 (echo Inconsistent kallsyms data
; \
641 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS
; \
642 rm .tmp_kallsyms
* ; /bin
/false
)
645 # Update busybox version before link
646 # Use + in front of this rule to silent warning about make -j1
647 # First command is ':' to allow us to use + in front of this rule
648 cmd_ksym_ld
= $(cmd_busybox__
)
651 +$(call cmd
,busybox_version
)
652 $(call cmd
,busybox__
)
653 $(Q
)echo
'cmd_$@ := $(cmd_busybox__)' > $(@D
)/.
$(@F
).cmd
656 # Generate .S file with all kernel symbols
657 quiet_cmd_kallsyms
= KSYM
$@
658 cmd_kallsyms
= $(NM
) -n
$< |
$(KALLSYMS
) \
659 $(if
$(CONFIG_KALLSYMS_ALL
),--all-symbols
) > $@
661 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o
: %.o
: %.S scripts FORCE
662 $(call if_changed_dep
,as_o_S
)
664 .tmp_kallsyms
%.S
: .tmp_busybox
% $(KALLSYMS
)
667 # .tmp_busybox1 must be complete except kallsyms, so update busybox version
668 .tmp_busybox1
: $(busybox-lds
) $(busybox-all
) FORCE
669 $(call if_changed_rule
,ksym_ld
)
671 .tmp_busybox2
: $(busybox-lds
) $(busybox-all
) .tmp_kallsyms1.o FORCE
672 $(call if_changed
,busybox__
)
674 .tmp_busybox3
: $(busybox-lds
) $(busybox-all
) .tmp_kallsyms2.o FORCE
675 $(call if_changed
,busybox__
)
677 # Needs to visit scripts/ before $(KALLSYMS) can be used.
678 $(KALLSYMS
): scripts
;
680 # Generate some data for debugging strange kallsyms problems
681 debug_kallsyms
: .tmp_map
$(last_kallsyms
)
683 .tmp_map
%: .tmp_busybox
% FORCE
684 ($(OBJDUMP
) -h
$< |
$(AWK
) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM
) $<) |
sort > $@
690 endif # ifdef CONFIG_KALLSYMS
692 # busybox image - including updated kernel symbols
693 busybox_unstripped
: $(busybox-all
) FORCE
694 $(call if_changed_rule
,busybox__
)
695 $(Q
)rm -f .old_version
697 busybox
: busybox_unstripped
698 ifeq ($(SKIP_STRIP
),y
)
701 $(Q
)$(STRIP
) -s
--remove-section
=.note
--remove-section
=.comment \
702 busybox_unstripped
-o
$@
703 # strip is confused by PIE executable and does not set exec bits
707 # The actual objects are generated when descending,
708 # make sure no implicit rule kicks in
709 $(sort $(busybox-all
)): $(busybox-dirs
) ;
711 # Handle descending into subdirectories listed in $(busybox-dirs)
712 # Preset locale variables to speed up the build process. Limit locale
713 # tweaks to this spot to avoid wrong language settings when running
714 # make menuconfig etc.
715 # Error messages still appears in the original language
717 PHONY
+= $(busybox-dirs
)
718 $(busybox-dirs
): prepare scripts
719 $(Q
)$(MAKE
) $(build
)=$@
721 # Build the kernel release string
722 # The KERNELRELEASE is stored in a file named .kernelrelease
723 # to be used when executing for example make install or make modules_install
725 # Take the contents of any files called localversion* and the config
726 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
727 # LOCALVERSION from the command line override all of this
730 space
:= $(nullstring
) # end of line
732 ___localver
= $(objtree
)/localversion
* $(srctree
)/localversion
*
733 __localver
= $(sort $(wildcard $(___localver
)))
734 # skip backup files (containing '~')
735 _localver
= $(foreach f
, $(__localver
), $(if
$(findstring ~
, $(f
)),,$(f
)))
737 localver
= $(subst $(space
),, \
738 $(shell cat
/dev
/null
$(_localver
)) \
739 $(patsubst "%",%,$(CONFIG_LOCALVERSION
)))
741 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
742 # and if the SCM is know a tag from the SCM is appended.
743 # The appended tag is determinded by the SCM used.
745 # Currently, only git is supported.
746 # Other SCMs can edit scripts/setlocalversion and add the appropriate
748 ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO
749 _localver-auto
= $(shell $(CONFIG_SHELL
) \
750 $(srctree
)/scripts
/setlocalversion
$(srctree
))
751 localver-auto
= $(LOCALVERSION
)$(_localver-auto
)
754 localver-full
= $(localver
)$(localver-auto
)
756 # Store (new) KERNELRELASE string in .kernelrelease
757 kernelrelease
= $(KERNELVERSION
)$(localver-full
)
758 .kernelrelease
: FORCE
760 $(Q
)echo
$(kernelrelease
) > $@
763 # Things we need to do before we recursively start building the kernel
764 # or the modules are listed in "prepare".
765 # A multi level approach is used. prepareN is processed before prepareN-1.
766 # archprepare is used in arch Makefiles and when processed asm symlink,
767 # version.h and scripts_basic is processed / created.
769 # Listed in dependency order
770 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
772 # prepare-all is deprecated, use prepare as valid replacement
775 # prepare3 is used to check if we are building in a separate output directory,
777 # 1) Check that make has not been executed in the kernel src $(srctree)
778 # 2) Create the include2 directory, used for the second asm symlink
779 prepare3
: .kernelrelease
780 ifneq ($(KBUILD_SRC
),)
781 @echo
' Using $(srctree) as source for busybox'
782 $(Q
)if
[ -f
$(srctree
)/.config
]; then \
783 echo
" $(srctree) is not clean, please run 'make mrproper'";\
784 echo
" in the '$(srctree)' directory.";\
787 $(Q
)if
[ ! -d include2
]; then mkdir
-p include2
; fi
;
788 $(Q
)ln
-fsn
$(srctree
)/include/asm-
$(ARCH
) include2
/asm
791 # prepare2 creates a makefile if using a separate output directory
792 prepare2
: prepare3 outputmakefile
794 prepare1
: prepare2
include/config
/MARKER
795 ifneq ($(KBUILD_MODULES
),)
796 $(Q
)mkdir
-p
$(MODVERDIR
)
797 $(Q
)rm -f
$(MODVERDIR
)/*
800 archprepare
: prepare1 scripts_basic
802 prepare0
: archprepare FORCE
803 $(Q
)$(MAKE
) $(build
)=.
805 # All the preparing..
806 prepare prepare-all
: prepare0
808 # Leave this as default for preprocessing busybox.lds.S, which is now
809 # done in arch/$(ARCH)/kernel/Makefile
811 export CPPFLAGS_busybox.lds
+= -P
-C
-U
$(ARCH
)
813 # FIXME: The asm symlink changes when $(ARCH) changes. That's
814 # hard to detect, but I suppose "make mrproper" is a good idea
815 # before switching between archs anyway.
818 #bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
819 #bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi;
820 #bbox# @ln -fsn asm-$(ARCH) $@
822 # Split autoconf.h into include/linux/config/*
823 quiet_cmd_gen_bbconfigopts
= GEN
include/bbconfigopts.h
824 cmd_gen_bbconfigopts
= $(srctree
)/scripts
/mkconfigs
> include/bbconfigopts.h
825 quiet_cmd_split_autoconf
= SPLIT
include/autoconf.h
-> include/config
/*
826 cmd_split_autoconf
= scripts
/basic
/split-include
include/autoconf.h
include/config
827 #bbox# piggybacked generation of few .h files
828 include/config
/MARKER
: scripts
/basic
/split-include
include/autoconf.h
829 $(call cmd
,split_autoconf
)
830 $(call cmd
,gen_bbconfigopts
)
833 # Generate some files
834 # ---------------------------------------------------------------------------
836 # KERNELRELEASE can change from a few different places, meaning version.h
837 # needs to be updated, so this check is forced on all builds
841 define filechk_version.h
842 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
843 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
846 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
847 echo \
#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
848 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
852 # ---------------------------------------------------------------------------
856 @echo
'*** Warning: make $@ is unnecessary now.'
858 # ---------------------------------------------------------------------------
861 ifdef _BB_DISABLED_CONFIG_MODULES
863 # By default, build modules as well
870 modules
: $(busybox-dirs
) $(if
$(KBUILD_BUILTIN
),busybox
)
871 @echo
' Building modules, stage 2.';
872 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modpost
875 # Target to prepare building external modules
876 PHONY
+= modules_prepare
877 modules_prepare
: prepare scripts
879 # Target to install modules
880 PHONY
+= modules_install
881 modules_install
: _modinst_ _modinst_post
885 @if
[ -z
"`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
886 echo
"Warning: you may need to install module-init-tools"; \
887 echo
"See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
890 @
rm -rf
$(MODLIB
)/kernel
891 @
rm -f
$(MODLIB
)/source
892 @mkdir
-p
$(MODLIB
)/kernel
893 @ln
-s
$(srctree
) $(MODLIB
)/source
894 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
895 rm -f
$(MODLIB
)/build
; \
896 ln
-s
$(objtree
) $(MODLIB
)/build
; \
898 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modinst
900 # If System.map exists, run depmod. This deliberately does not have a
901 # dependency on System.map since that would run the dependency tree on
902 # busybox. This depmod is only for convenience to give the initial
903 # boot a modules.dep even before / is mounted read-write. However the
904 # boot script depmod is the master version.
905 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
908 depmod_opts
:= -b
$(INSTALL_MOD_PATH
) -r
910 PHONY
+= _modinst_post
911 _modinst_post
: _modinst_
912 if
[ -r System.map
-a
-x
$(DEPMOD
) ]; then
$(DEPMOD
) -ae
-F System.map
$(depmod_opts
) $(KERNELRELEASE
); fi
914 else # CONFIG_MODULES
916 # Modules not configured
917 # ---------------------------------------------------------------------------
919 modules modules_install
: FORCE
921 @echo
"The present busybox configuration has modules disabled."
922 @echo
"Type 'make config' and enable loadable module support."
923 @echo
"Then build a kernel with module support enabled."
927 endif # CONFIG_MODULES
930 # Cleaning is done on three levels.
931 # make clean Delete most generated files
932 # Leave enough to build external modules
933 # make mrproper Delete the current configuration, and all generated files
934 # make distclean Remove editor backup files, patch leftover files and the like
936 # Directories & files removed with 'make clean'
937 CLEAN_DIRS
+= $(MODVERDIR
) _install
0_lib
938 CLEAN_FILES
+= busybox busybox_unstripped
* busybox.links \
939 System.map .kernelrelease \
940 .tmp_kallsyms
* .tmp_version .tmp_busybox
* .tmp_System.map
942 # Directories & files removed with 'make mrproper'
943 MRPROPER_DIRS
+= include/config include2
944 MRPROPER_FILES
+= .config .config.old
include/asm .version .old_version \
946 include/bbconfigopts.h \
947 include/usage_compressed.h \
948 include/applet_tables.h \
950 .kernelrelease Module.symvers
tags TAGS cscope
* \
953 # clean - Delete most, but leave enough to build external modules
955 clean: rm-dirs
:= $(CLEAN_DIRS
)
956 clean: rm-files
:= $(CLEAN_FILES
)
957 clean-dirs
:= $(addprefix _clean_
,$(srctree
) $(busybox-alldirs
))
959 PHONY
+= $(clean-dirs
) clean archclean
961 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
963 clean: archclean
$(clean-dirs
)
966 @find .
$(RCS_FIND_IGNORE
) \
967 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
968 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
) \
969 -type f
-print | xargs
rm -f
972 doc-clean
: rm-files
:= docs
/busybox.pod \
973 docs
/BusyBox.html docs
/BusyBox
.1 docs
/BusyBox.txt
977 # mrproper - Delete all generated files, including .config
979 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
980 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
981 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
983 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
985 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
987 mrproper
: clean archmrproper
$(mrproper-dirs
)
996 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
997 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
998 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'.*.orig' \
999 -o
-name
'.*.rej' -o
-name
'*.tmp' -o
-size
0 \
1000 -o
-name
'*%' -o
-name
'.*.cmd' -o
-name
'core' \
) \
1001 -type f
-print | xargs
rm -f
1004 # Packaging of the kernel to various formats
1005 # ---------------------------------------------------------------------------
1006 # rpm target kept for backward compatibility
1007 package-dir
:= $(srctree
)/scripts
/package
1010 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1012 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1015 # Brief documentation of the typical targets used
1016 # ---------------------------------------------------------------------------
1018 boards
:= $(wildcard $(srctree
)/arch
/$(ARCH
)/configs
/*_defconfig
)
1019 boards
:= $(notdir $(boards
))
1021 -include $(srctree
)/Makefile.help
1023 # Documentation targets
1024 # ---------------------------------------------------------------------------
1025 %docs
: scripts_basic FORCE
1026 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
1028 else # KBUILD_EXTMOD
1031 # External module support.
1032 # When building external modules the kernel used as basis is considered
1033 # read-only, and no consistency checks are made and the make
1034 # system is not used on the basis kernel. If updates are required
1035 # in the basis kernel ordinary make commands (without M=...) must
1038 # The following are the only valid targets when building external
1040 # make M=dir clean Delete all automatically generated files
1041 # make M=dir modules Make all modules in specified dir
1042 # make M=dir Same as 'make M=dir modules'
1043 # make M=dir modules_install
1044 # Install the modules build in the module directory
1045 # Assumes install directory is already created
1047 # We are always building modules
1049 PHONY
+= crmodverdir
1051 $(Q
)mkdir
-p
$(MODVERDIR
)
1052 $(Q
)rm -f
$(MODVERDIR
)/*
1054 PHONY
+= $(objtree
)/Module.symvers
1055 $(objtree
)/Module.symvers
:
1056 @
test -e
$(objtree
)/Module.symvers ||
( \
1058 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1059 echo
" is missing; modules will have no dependencies and modversions."; \
1062 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1063 PHONY
+= $(module-dirs
) modules
1064 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1065 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1067 modules
: $(module-dirs
)
1068 @echo
' Building modules, stage 2.';
1069 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modpost
1071 PHONY
+= modules_install
1072 modules_install
: _emodinst_ _emodinst_post
1074 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1077 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1078 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modinst
1080 # Run depmod only is we have System.map and depmod is executable
1081 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1082 cmd_depmod
= if
[ -r System.map
-a
-x
$(DEPMOD
) ]; then \
1083 $(DEPMOD
) -ae
-F System.map \
1084 $(if
$(strip $(INSTALL_MOD_PATH
)), \
1085 -b
$(INSTALL_MOD_PATH
) -r
) \
1089 PHONY
+= _emodinst_post
1090 _emodinst_post
: _emodinst_
1093 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1095 PHONY
+= $(clean-dirs
) clean
1097 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1099 clean: rm-dirs
:= $(MODVERDIR
)
1100 clean: $(clean-dirs
)
1102 @find
$(KBUILD_EXTMOD
) $(RCS_FIND_IGNORE
) \
1103 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1104 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
) \
1105 -type f
-print | xargs
rm -f
1108 @echo
' Building external modules.'
1109 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1111 @echo
' modules - default target, build the module(s)'
1112 @echo
' modules_install - install the module'
1113 @echo
' clean - remove generated files in module directory only'
1117 PHONY
+= prepare scripts
1120 endif # KBUILD_EXTMOD
1122 # Generate tags for editors
1123 # ---------------------------------------------------------------------------
1125 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1126 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1127 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1129 ifeq ($(src
),$(obj
))
1132 __srctree
= $(srctree
)/
1135 ifeq ($(ALLSOURCE_ARCHS
),)
1137 ALLINCLUDE_ARCHS
:= $(ARCH
) $(SUBARCH
)
1139 ALLINCLUDE_ARCHS
:= $(ARCH
)
1142 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1143 ALLINCLUDE_ARCHS
:= $(ALLSOURCE_ARCHS
)
1146 ALLSOURCE_ARCHS
:= $(ARCH
)
1149 ( find
$(__srctree
) $(RCS_FIND_IGNORE
) \
1150 \
( -name
include -o
-name arch \
) -prune
-o \
1151 -name
'*.[chS]' -print; \
1152 for ARCH in
$(ALLSOURCE_ARCHS
) ; do \
1153 find
$(__srctree
)arch
/$${ARCH} $(RCS_FIND_IGNORE
) \
1154 -name
'*.[chS]' -print; \
1156 find
$(__srctree
)security
/selinux
/include $(RCS_FIND_IGNORE
) \
1157 -name
'*.[chS]' -print; \
1158 find
$(__srctree
)include $(RCS_FIND_IGNORE
) \
1159 \
( -name config
-o
-name
'asm-*' \
) -prune \
1160 -o
-name
'*.[chS]' -print; \
1161 for ARCH in
$(ALLINCLUDE_ARCHS
) ; do \
1162 find
$(__srctree
)include/asm-
$${ARCH} $(RCS_FIND_IGNORE
) \
1163 -name
'*.[chS]' -print; \
1165 find
$(__srctree
)include/asm-generic
$(RCS_FIND_IGNORE
) \
1166 -name
'*.[chS]' -print )
1169 quiet_cmd_cscope-file
= FILELST cscope.files
1170 cmd_cscope-file
= (echo \
-k
; echo \
-q
; $(all-sources
)) > cscope.files
1172 quiet_cmd_cscope
= MAKE cscope.out
1173 cmd_cscope
= cscope
-b
1176 $(call cmd
,cscope-file
)
1179 quiet_cmd_TAGS
= MAKE
$@
1182 ETAGSF
=`etags --version | grep -i exuberant >/dev/null && \
1183 echo "-I __initdata,__exitdata,__acquires,__releases \
1184 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1185 --extra=+f --c-kinds=+px"`; \
1186 $(all-sources
) | xargs etags
$$ETAGSF -a
1193 quiet_cmd_tags
= MAKE
$@
1196 CTAGSF
=`ctags --version | grep -i exuberant >/dev/null && \
1197 echo "-I __initdata,__exitdata,__acquires,__releases \
1198 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1199 --extra=+f --c-kinds=+px"`; \
1200 $(all-sources
) | xargs ctags
$$CTAGSF -a
1207 # Scripts to check various things for consistency
1208 # ---------------------------------------------------------------------------
1211 find
* $(RCS_FIND_IGNORE
) \
1212 -name
'*.[hcS]' -type f
-print |
sort \
1213 | xargs
$(PERL
) -w scripts
/checkincludes.pl
1216 find
* $(RCS_FIND_IGNORE
) \
1217 -name
'*.[hcS]' -type f
-print |
sort \
1218 | xargs
$(PERL
) -w scripts
/checkversion.pl
1221 $(PERL
) $(srctree
)/scripts
/namespace.pl
1223 endif #ifeq ($(config-targets),1)
1224 endif #ifeq ($(mixed-targets),1)
1228 $(OBJDUMP
) -d busybox
$$(find .
-name
'*.ko') | \
1229 $(PERL
) $(src
)/scripts
/checkstack.pl
$(ARCH
)
1232 $(if
$(wildcard .kernelrelease
), $(Q
)echo
$(KERNELRELEASE
), \
1233 $(error kernelrelease not valid
- run
'make *config' to update it
))
1235 @echo
$(KERNELVERSION
)
1238 # ---------------------------------------------------------------------------
1239 # Single targets are compatible with:
1240 # - build whith mixed source and output
1241 # - build with separate output dir 'make O=...'
1242 # - external modules
1244 # target-dir => where to store outputfile
1245 # build-dir => directory in kernel source tree to use
1247 ifeq ($(KBUILD_EXTMOD
),)
1248 build-dir
= $(patsubst %/,%,$(dir $@
))
1249 target-dir
= $(dir $@
)
1251 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1252 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1253 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1256 %.s
: %.c prepare scripts FORCE
1257 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1258 %.i
: %.c prepare scripts FORCE
1259 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1260 %.o
: %.c prepare scripts FORCE
1261 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1262 %.lst
: %.c prepare scripts FORCE
1263 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1264 %.s
: %.S prepare scripts FORCE
1265 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1266 %.o
: %.S prepare scripts FORCE
1267 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1270 / %/: prepare scripts FORCE
1271 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1272 $(build
)=$(build-dir
)
1273 %.ko
: prepare scripts FORCE
1274 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1275 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1276 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modpost
1278 # FIXME Should go into a make.lib or something
1279 # ===========================================================================
1281 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1282 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1284 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1285 cmd_rmfiles
= rm -f
$(rm-files
)
1288 a_flags
= -Wp
,-MD
,$(depfile
) $(AFLAGS
) $(AFLAGS_KERNEL
) \
1289 $(NOSTDINC_FLAGS
) $(CPPFLAGS
) \
1290 $(modkern_aflags
) $(EXTRA_AFLAGS
) $(AFLAGS_
$(*F
).o
)
1292 quiet_cmd_as_o_S
= AS
$@
1293 cmd_as_o_S
= $(CC
) $(a_flags
) -c
-o
$@
$<
1295 # read all saved command lines
1297 targets
:= $(wildcard $(sort $(targets
)))
1298 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1300 ifneq ($(cmd_files
),)
1301 $(cmd_files
): ; # Do not try to update included dependency files
1302 include $(cmd_files
)
1305 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1307 # $(Q)$(MAKE) $(clean)=dir
1308 clean := -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.
clean obj
1310 endif # skip-makefile
1315 -include $(srctree
)/Makefile.custom
1317 # Declare the contents of the .PHONY variable as phony. We keep that
1318 # information in a variable se we can use it in if_changed and friends.