5 NAME=Sliding Snow Leopard
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 # Add custom flags here to avoid conflict with updates
14 EXTRAVERSION := $(EXTRAVERSION)-omap2
16 # Do not print "Entering directory ..."
17 MAKEFLAGS += --no-print-directory
19 # We are using a recursive build, so we need to do a little thinking
20 # to get the ordering right.
22 # Most importantly: sub-Makefiles should only ever modify files in
23 # their own directory. If in some directory we have a dependency on
24 # a file in another dir (which doesn't happen often, but it's often
25 # unavoidable when linking the built-in.o targets which finally
26 # turn into vmlinux), we will call a sub make in that other dir, and
27 # after that we are sure that everything which is in that other dir
30 # The only cases where we need to modify files which have global
31 # effects are thus separated out and done before the recursive
32 # descending is started. They are now explicitly listed as the
35 # To put more focus on warnings, be less verbose as default
36 # Use 'make V=1' to see the full commands
39 ifeq ("$(origin V)", "command line")
47 # Call sparse as part of compilation of C files
48 # Use 'make C=1' to enable sparse checking
51 ifeq ("$(origin C)", "command line")
52 KBUILD_CHECKSRC = $(C)
55 ifndef KBUILD_CHECKSRC
59 # Use make M=dir to specify directory of external module to build
60 # Old syntax make ... SUBDIRS=$PWD is still supported
61 # Setting the environment variable KBUILD_EXTMOD take precedence
63 KBUILD_EXTMOD ?= $(SUBDIRS)
66 ifeq ("$(origin M)", "command line")
72 # kbuild supports saving output files in a separate directory.
73 # To locate output files in a separate directory two syntaxes are supported.
74 # In both cases the working directory must be the root of the kernel src.
76 # Use "make O=dir/to/store/output/files/"
78 # 2) Set KBUILD_OUTPUT
79 # Set the environment variable KBUILD_OUTPUT to point to the directory
80 # where the output files shall be placed.
81 # export KBUILD_OUTPUT=dir/to/store/output/files/
84 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
88 # KBUILD_SRC is set on invocation of make in OBJ directory
89 # KBUILD_SRC is not intended to be used by the regular user (for now)
92 # OK, Make called in directory where kernel src resides
93 # Do we want to locate output files in a separate directory?
95 ifeq ("$(origin O)", "command line")
100 # That's our default target when none is given on the command line
104 ifneq ($(KBUILD_OUTPUT),)
105 # Invoke a second make in the output directory, passing relevant variables
106 # check that the output directory actually exists
107 saved-output := $(KBUILD_OUTPUT)
108 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
109 $(if $(KBUILD_OUTPUT),, \
110 $(error output directory "$(saved-output)" does not exist))
112 .PHONY: $(MAKECMDGOALS)
114 $(filter-out _all,$(MAKECMDGOALS)) _all:
115 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
116 KBUILD_SRC=$(CURDIR) \
117 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
119 # Leave processing to above invocation of make
121 endif # ifneq ($(KBUILD_OUTPUT),)
122 endif # ifeq ($(KBUILD_SRC),)
124 # We process the rest of the Makefile if this is the final invocation of make
125 ifeq ($(skip-makefile),)
127 # If building an external module we do not care about the all: rule
128 # but instead _all depend on modules
130 ifeq ($(KBUILD_EXTMOD),)
136 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
138 # FIXME - TOPDIR is obsolete, use srctree/objtree
145 export srctree objtree VPATH TOPDIR
148 space := $(nullstring) # end of line
150 # Take the contents of any files called localversion* and the config
151 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. Be
152 # careful not to include files twice if building in the source
153 # directory. LOCALVERSION from the command line override all of this
155 localver := $(objtree)/localversion* $(srctree)/localversion*
156 localver := $(sort $(wildcard $(localver)))
157 # skip backup files (containing '~')
158 localver := $(foreach f, $(localver), $(if $(findstring ~, $(f)),,$(f)))
160 LOCALVERSION = $(subst $(space),, \
161 $(shell cat /dev/null $(localver)) \
162 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
164 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)
166 # SUBARCH tells the usermode build what the underlying arch is. That is set
167 # first, and if a usermode build is happening, the "ARCH=um" on the command
168 # line overrides the setting of ARCH below. If a native build is happening,
169 # then ARCH is assigned, getting whatever value it gets normally, and
170 # SUBARCH is subsequently ignored.
172 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
173 -e s/arm.*/arm/ -e s/sa110/arm/ \
174 -e s/s390x/s390/ -e s/parisc64/parisc/ \
175 -e s/ppc64/powerpc/ )
178 # Cross compiling and selecting different set of gcc/bin-utils
179 # ---------------------------------------------------------------------------
181 # When performing cross compilation for other architectures ARCH shall be set
182 # to the target architecture. (See arch/* for the possibilities).
183 # ARCH can be set during invocation of make:
185 # Another way is to have ARCH set in the environment.
186 # The default ARCH is the host where make is executed.
188 # CROSS_COMPILE specify the prefix used for all executables used
189 # during compilation. Only gcc and related bin-utils executables
190 # are prefixed with $(CROSS_COMPILE).
191 # CROSS_COMPILE can be set on the command line
192 # make CROSS_COMPILE=ia64-linux-
193 # Alternatively CROSS_COMPILE can be set in the environment.
194 # Default value for CROSS_COMPILE is not to prefix executables
195 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
198 CROSS_COMPILE ?= arm-linux-
200 # Architecture as present in compile.h
201 UTS_MACHINE := $(ARCH)
203 # SHELL used by kbuild
204 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
205 else if [ -x /bin/bash ]; then echo /bin/bash; \
206 else echo sh; fi ; fi)
210 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
213 # Decide whether to build built-in, modular, or both.
214 # Normally, just do built-in.
219 # If we have only "make modules", don't compile built-in objects.
220 # When we're building modules with modversions, we need to consider
221 # the built-in objects during the descend as well, in order to
222 # make sure the checksums are uptodate before we record them.
224 ifeq ($(MAKECMDGOALS),modules)
225 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
228 # If we have "make <whatever> modules", compile modules
229 # in addition to whatever we do anyway.
230 # Just "make" or "make all" shall build modules as well
232 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
236 ifeq ($(MAKECMDGOALS),)
240 export KBUILD_MODULES KBUILD_BUILTIN
241 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
244 # ---------------------------------------------------------------------------
246 # Normally, we echo the whole command before executing it. By making
247 # that echo $($(quiet)$(cmd)), we now have the possibility to set
248 # $(quiet) to choose other forms of output instead, e.g.
250 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
251 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
253 # If $(quiet) is empty, the whole command will be printed.
254 # If it is set to "quiet_", only the short version will be printed.
255 # If it is set to "silent_", nothing wil be printed at all, since
256 # the variable $(silent_cmd_cc_o_c) doesn't exist.
258 # A simple variant is to prefix commands with $(Q) - that's usefull
259 # for commands that shall be hidden in non-verbose mode.
263 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
264 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
266 ifeq ($(KBUILD_VERBOSE),1)
274 # If the user is running make -s (silent mode), suppress echoing of
277 ifneq ($(findstring s,$(MAKEFLAGS)),)
281 export quiet Q KBUILD_VERBOSE
284 # cc support functions to be used (only) in arch/$(ARCH)/Makefile
285 # See documentation in Documentation/kbuild/makefiles.txt
288 # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
290 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
291 > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
293 # For backward compatibility
294 check_gcc = $(warning check_gcc is deprecated - use cc-option) \
295 $(call cc-option, $(1),$(2))
298 # Usage: flag := $(call cc-option-yn, -march=winchip-c6)
299 cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
300 > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
303 # Prefix align with either -falign or -malign
304 cc-option-align = $(subst -functions=0,,\
305 $(call cc-option,-falign-functions=0,-malign-functions=0))
308 # Usage gcc-ver := $(call cc-version $(CC))
309 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
310 $(if $(1), $(1), $(CC)))
313 # Look for make include files relative to root of kernel src
314 MAKEFLAGS += --include-dir=$(srctree)
316 # We need some generic definitions
317 include $(srctree)/scripts/Kbuild.include
319 # For maximum performance (+ possibly random breakage, uncomment
324 # Make variables (CC, etc...)
326 AS = $(CROSS_COMPILE)as
327 LD = $(CROSS_COMPILE)ld
328 CC = $(CROSS_COMPILE)gcc
330 AR = $(CROSS_COMPILE)ar
331 NM = $(CROSS_COMPILE)nm
332 STRIP = $(CROSS_COMPILE)strip
333 OBJCOPY = $(CROSS_COMPILE)objcopy
334 OBJDUMP = $(CROSS_COMPILE)objdump
336 GENKSYMS = scripts/genksyms/genksyms
337 DEPMOD = /sbin/depmod
338 KALLSYMS = scripts/kallsyms
342 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
344 CFLAGS_MODULE = $(MODFLAGS)
345 AFLAGS_MODULE = $(MODFLAGS)
351 # Use LINUXINCLUDE when you must reference the include/ directory.
352 # Needed to be compatible with the O= option
353 LINUXINCLUDE := -Iinclude \
354 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
355 -include include/linux/autoconf.h
357 CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
359 CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
360 -fno-strict-aliasing -fno-common \
362 AFLAGS := -D__ASSEMBLY__
364 export VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \
365 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
366 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
367 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
369 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
370 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
371 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
373 # When compiling out-of-tree modules, put MODVERDIR in the module
374 # tree rather than in the kernel tree. The kernel tree might
376 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
378 # Files to ignore in find ... statements
380 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
381 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
383 # ===========================================================================
384 # Rules shared between *config targets and build targets
386 # Basic helpers built in scripts/
387 .PHONY: scripts_basic
389 $(Q)$(MAKE) $(build)=scripts/basic
391 # To avoid any implicit rule to kick in, define an empty command.
392 scripts/basic/%: scripts_basic ;
394 .PHONY: outputmakefile
395 # outputmakefile generate a Makefile to be placed in output directory, if
396 # using a seperate output directory. This allows convinient use
397 # of make in output directory
399 $(Q)if test ! $(srctree) -ef $(objtree); then \
400 $(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
401 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) \
402 > $(objtree)/Makefile; \
403 echo ' GEN $(objtree)/Makefile'; \
406 # To make sure we do not include .config for any of the *config targets
407 # catch them early, and hand them over to scripts/kconfig/Makefile
408 # It is allowed to specify more targets when calling make, including
409 # mixing *config targets and build targets.
410 # For example 'make oldconfig all'.
411 # Detect when mixed targets is specified, and make a second invocation
412 # of make so .config is not included in this case either (for *config).
414 no-dot-config-targets := clean mrproper distclean \
415 cscope TAGS tags help %docs check%
421 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
422 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
427 ifeq ($(KBUILD_EXTMOD),)
428 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
430 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
436 ifeq ($(mixed-targets),1)
437 # ===========================================================================
438 # We're called with mixed targets (*config and build targets).
439 # Handle them one by one.
442 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
445 ifeq ($(config-targets),1)
446 # ===========================================================================
447 # *config targets only - make sure prerequisites are updated, and descend
448 # in scripts/kconfig to make the *config target
450 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
451 # KBUILD_DEFCONFIG may point out an alternative default configuration
452 # used for 'make defconfig'
453 include $(srctree)/arch/$(ARCH)/Makefile
454 export KBUILD_DEFCONFIG
456 config %config: scripts_basic outputmakefile FORCE
457 $(Q)mkdir -p include/linux
458 $(Q)$(MAKE) $(build)=scripts/kconfig $@
461 # ===========================================================================
462 # Build targets only - this includes vmlinux, arch specific targets, clean
463 # targets and others. In general all targets except *config targets.
465 ifeq ($(KBUILD_EXTMOD),)
466 # Additional helpers built in scripts/
467 # Carefully list dependencies so we do not try to build scripts twice
470 scripts: scripts_basic include/config/MARKER
471 $(Q)$(MAKE) $(build)=$(@)
473 scripts_basic: include/linux/autoconf.h
475 # Objects we will link into vmlinux / subdirs we need to visit
477 drivers-y := drivers/ sound/
481 endif # KBUILD_EXTMOD
483 ifeq ($(dot-config),1)
484 # In this section, we need .config
486 # Read in dependencies to all Kconfig* files, make sure to run
487 # oldconfig if changes are detected.
492 # If .config needs to be updated, it will be done via the dependency
493 # that autoconf has on .config.
494 # To avoid any implicit rule to kick in, define an empty command
497 # If .config is newer than include/linux/autoconf.h, someone tinkered
498 # with it and forgot to run make oldconfig
499 include/linux/autoconf.h: .config
500 $(Q)mkdir -p include/linux
501 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
503 # Dummy target needed, because used as prerequisite
504 include/linux/autoconf.h: ;
507 # The all: target is the default when no target is given on the
509 # This allow a user to issue only 'make' to build a kernel including modules
510 # Defaults vmlinux but it is usually overriden in the arch makefile
513 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
519 #Add align options if CONFIG_CC_* is not equal to 0
520 add-align = $(if $(filter-out 0,$($(1))),$(cc-option-align)$(2)=$($(1)))
521 CFLAGS += $(call add-align,CONFIG_CC_ALIGN_FUNCTIONS,-functions)
522 CFLAGS += $(call add-align,CONFIG_CC_ALIGN_LABELS,-labels)
523 CFLAGS += $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
524 CFLAGS += $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
526 ifdef CONFIG_FRAME_POINTER
527 CFLAGS += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
529 CFLAGS += -fomit-frame-pointer
532 ifdef CONFIG_DEBUG_INFO
536 include $(srctree)/arch/$(ARCH)/Makefile
538 # arch Makefile may override CC so keep this after arch Makefile is included
539 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
540 CHECKFLAGS += $(NOSTDINC_FLAGS)
542 # warn about C99 declaration after statement
543 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
545 # disable pointer signedness warnings in gcc 4.0
546 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
548 # Default kernel image to build when no specific target is given.
549 # KBUILD_IMAGE may be overruled on the commandline or
550 # set in the environment
551 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
553 export KBUILD_IMAGE ?= vmlinux
556 # INSTALL_PATH specifies where to place the updated kernel and system map
557 # images. Default is /boot, but you can set it to other values
558 export INSTALL_PATH ?= /boot
560 # If CONFIG_LOCALVERSION_AUTO is set, we automatically perform some tests
561 # and try to determine if the current source tree is a release tree, of any sort,
562 # or if is a pure development tree.
564 # A 'release tree' is any tree with a git TAG associated
565 # with it. The primary goal of this is to make it safe for a native
566 # git/CVS/SVN user to build a release tree (i.e, 2.6.9) and also to
567 # continue developing against the current Linus tree, without having the Linus
568 # tree overwrite the 2.6.9 tree when installed.
570 # Currently, only git is supported.
571 # Other SCMs can edit scripts/setlocalversion and add the appropriate
575 ifdef CONFIG_LOCALVERSION_AUTO
576 localversion-auto := $(shell $(PERL) $(srctree)/scripts/setlocalversion $(srctree))
577 LOCALVERSION := $(LOCALVERSION)$(localversion-auto)
581 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
582 # relocations required by build roots. This is not defined in the
583 # makefile but the arguement can be passed to make if needed.
586 MODLIB := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
590 ifeq ($(KBUILD_EXTMOD),)
591 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
593 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
594 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
595 $(net-y) $(net-m) $(libs-y) $(libs-m)))
597 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
599 $(core-n) $(core-) $(drivers-n) $(drivers-) \
600 $(net-n) $(net-) $(libs-n) $(libs-))))
602 init-y := $(patsubst %/, %/built-in.o, $(init-y))
603 core-y := $(patsubst %/, %/built-in.o, $(core-y))
604 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
605 net-y := $(patsubst %/, %/built-in.o, $(net-y))
606 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
607 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
608 libs-y := $(libs-y1) $(libs-y2)
611 # ---------------------------------------------------------------------------
612 # vmlinux is build from the objects selected by $(vmlinux-init) and
613 # $(vmlinux-main). Most are built-in.o files from top-level directories
614 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
615 # Ordering when linking is important, and $(vmlinux-init) must be first.
620 # +-< $(vmlinux-init)
621 # | +--< init/version.o + more
623 # +--< $(vmlinux-main)
624 # | +--< driver/built-in.o mm/built-in.o + more
626 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
628 # vmlinux version (uname -v) cannot be updated during normal
629 # descending-into-subdirs phase since we do not yet know if we need to
631 # Therefore this step is delayed until just before final link of vmlinux -
632 # except in the kallsyms case where it is done just before adding the
633 # symbols to the kernel.
635 # System.map is generated to document addresses of all kernel symbols
637 vmlinux-init := $(head-y) $(init-y)
638 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
639 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
640 vmlinux-lds := arch/$(ARCH)/kernel/vmlinux.lds
642 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
643 # May be overridden by arch/$(ARCH)/Makefile
644 quiet_cmd_vmlinux__ ?= LD $@
645 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
646 -T $(vmlinux-lds) $(vmlinux-init) \
647 --start-group $(vmlinux-main) --end-group \
648 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
650 # Generate new vmlinux version
651 quiet_cmd_vmlinux_version = GEN .version
652 cmd_vmlinux_version = set -e; \
653 if [ ! -r .version ]; then \
657 mv .version .old_version; \
658 expr 0$$(cat .old_version) + 1 >.version; \
660 $(MAKE) $(build)=init
662 # Generate System.map
663 quiet_cmd_sysmap = SYSMAP
664 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
667 # If CONFIG_KALLSYMS is set .version is already updated
668 # Generate System.map and verify that the content is consistent
669 # Use + in front of the vmlinux_version rule to silent warning with make -j2
670 # First command is ':' to allow us to use + in front of the rule
671 define rule_vmlinux__
673 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
675 $(call cmd,vmlinux__)
676 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
678 $(Q)$(if $($(quiet)cmd_sysmap), \
679 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
680 $(cmd_sysmap) $@ System.map; \
681 if [ $$? -ne 0 ]; then \
689 ifdef CONFIG_KALLSYMS
690 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
691 # It's a three stage process:
692 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
694 # Running kallsyms on that gives us .tmp_kallsyms1.o with
695 # the right size - vmlinux version (uname -v) is updated during this step
696 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
697 # but due to the added section, some addresses have shifted.
698 # From here, we generate a correct .tmp_kallsyms2.o
699 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
700 # o Verify that the System.map from vmlinux matches the map from
701 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
702 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
703 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
704 # temporary bypass to allow the kernel to be built while the
705 # maintainers work out what went wrong with kallsyms.
707 ifdef CONFIG_KALLSYMS_EXTRA_PASS
713 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
715 define verify_kallsyms
716 $(Q)$(if $($(quiet)cmd_sysmap), \
717 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
718 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
719 $(Q)cmp -s System.map .tmp_System.map || \
720 (echo Inconsistent kallsyms data; \
721 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
722 rm .tmp_kallsyms* ; /bin/false )
725 # Update vmlinux version before link
726 # Use + in front of this rule to silent warning about make -j1
727 # First command is ':' to allow us to use + in front of this rule
728 cmd_ksym_ld = $(cmd_vmlinux__)
731 +$(call cmd,vmlinux_version)
732 $(call cmd,vmlinux__)
733 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
736 # Generate .S file with all kernel symbols
737 quiet_cmd_kallsyms = KSYM $@
738 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
739 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
741 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
742 $(call if_changed_dep,as_o_S)
744 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
747 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
748 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
749 $(call if_changed_rule,ksym_ld)
751 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
752 $(call if_changed,vmlinux__)
754 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
755 $(call if_changed,vmlinux__)
757 # Needs to visit scripts/ before $(KALLSYMS) can be used.
758 $(KALLSYMS): scripts ;
760 # Generate some data for debugging strange kallsyms problems
761 debug_kallsyms: .tmp_map$(last_kallsyms)
763 .tmp_map%: .tmp_vmlinux% FORCE
764 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
770 endif # ifdef CONFIG_KALLSYMS
772 # vmlinux image - including updated kernel symbols
773 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
774 $(call if_changed_rule,vmlinux__)
775 $(Q)rm -f .old_version
777 # The actual objects are generated when descending,
778 # make sure no implicit rule kicks in
779 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
781 # Handle descending into subdirectories listed in $(vmlinux-dirs)
782 # Preset locale variables to speed up the build process. Limit locale
783 # tweaks to this spot to avoid wrong language settings when running
784 # make menuconfig etc.
785 # Error messages still appears in the original language
787 .PHONY: $(vmlinux-dirs)
788 $(vmlinux-dirs): prepare scripts
789 $(Q)$(MAKE) $(build)=$@
791 # Things we need to do before we recursively start building the kernel
792 # or the modules are listed in "prepare".
793 # A multi level approach is used. prepareN is processed before prepareN-1.
794 # archprepare is used in arch Makefiles and when processed asm symlink,
795 # version.h and scripts_basic is processed / created.
797 # Listed in dependency order
798 .PHONY: prepare archprepare prepare0 prepare1 prepare2 prepare3
800 # prepare-all is deprecated, use prepare as valid replacement
803 # prepare3 is used to check if we are building in a separate output directory,
805 # 1) Check that make has not been executed in the kernel src $(srctree)
806 # 2) Create the include2 directory, used for the second asm symlink
809 ifneq ($(KBUILD_SRC),)
810 @echo ' Using $(srctree) as source for kernel'
811 $(Q)if [ -f $(srctree)/.config ]; then \
812 echo " $(srctree) is not clean, please run 'make mrproper'";\
813 echo " in the '$(srctree)' directory.";\
816 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
817 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
820 # prepare2 creates a makefile if using a separate output directory
821 prepare2: prepare3 outputmakefile
823 prepare1: prepare2 include/linux/version.h include/asm \
824 include/config/MARKER
825 ifneq ($(KBUILD_MODULES),)
826 $(Q)rm -rf $(MODVERDIR)
827 $(Q)mkdir -p $(MODVERDIR)
830 archprepare: prepare1 scripts_basic
832 prepare0: archprepare FORCE
833 $(Q)$(MAKE) $(build)=.
835 # All the preparing..
836 prepare prepare-all: prepare0
838 # Leave this as default for preprocessing vmlinux.lds.S, which is now
839 # done in arch/$(ARCH)/kernel/Makefile
841 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
844 # ---------------------------------------------------------------------------
846 %.s: %.c scripts FORCE
847 $(Q)$(MAKE) $(build)=$(@D) $@
848 %.i: %.c scripts FORCE
849 $(Q)$(MAKE) $(build)=$(@D) $@
850 %.o: %.c scripts FORCE
851 $(Q)$(MAKE) $(build)=$(@D) $@
853 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D) $(@:.ko=.o)
854 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
855 %/: scripts prepare FORCE
856 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
857 %.lst: %.c scripts FORCE
858 $(Q)$(MAKE) $(build)=$(@D) $@
859 %.s: %.S scripts FORCE
860 $(Q)$(MAKE) $(build)=$(@D) $@
861 %.o: %.S scripts FORCE
862 $(Q)$(MAKE) $(build)=$(@D) $@
864 # FIXME: The asm symlink changes when $(ARCH) changes. That's
865 # hard to detect, but I suppose "make mrproper" is a good idea
866 # before switching between archs anyway.
869 @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
870 $(Q)if [ ! -d include ]; then mkdir -p include; fi;
871 @ln -fsn asm-$(ARCH) $@
873 # Split autoconf.h into include/linux/config/*
875 include/config/MARKER: scripts/basic/split-include include/linux/autoconf.h
876 @echo ' SPLIT include/linux/autoconf.h -> include/config/*'
877 @scripts/basic/split-include include/linux/autoconf.h include/config
880 # Generate some files
881 # ---------------------------------------------------------------------------
883 # KERNELRELEASE can change from a few different places, meaning version.h
884 # needs to be updated, so this check is forced on all builds
888 define filechk_version.h
889 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
890 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
893 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
894 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
895 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
899 include/linux/version.h: $(srctree)/Makefile FORCE
900 $(call filechk,version.h)
902 # ---------------------------------------------------------------------------
906 @echo '*** Warning: make $@ is unnecessary now.'
908 # ---------------------------------------------------------------------------
913 # By default, build modules as well
920 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
921 @echo ' Building modules, stage 2.';
922 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
925 # Target to prepare building external modules
926 .PHONY: modules_prepare
927 modules_prepare: prepare scripts
929 # Target to install modules
930 .PHONY: modules_install
931 modules_install: _modinst_ _modinst_post
935 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
936 echo "Warning: you may need to install module-init-tools"; \
937 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
940 @rm -rf $(MODLIB)/kernel
941 @rm -f $(MODLIB)/source
942 @mkdir -p $(MODLIB)/kernel
943 @ln -s $(srctree) $(MODLIB)/source
944 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
945 rm -f $(MODLIB)/build ; \
946 ln -s $(objtree) $(MODLIB)/build ; \
948 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
950 # If System.map exists, run depmod. This deliberately does not have a
951 # dependency on System.map since that would run the dependency tree on
952 # vmlinux. This depmod is only for convenience to give the initial
953 # boot a modules.dep even before / is mounted read-write. However the
954 # boot script depmod is the master version.
955 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
958 depmod_opts := -b $(INSTALL_MOD_PATH) -r
960 .PHONY: _modinst_post
961 _modinst_post: _modinst_
962 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
964 else # CONFIG_MODULES
966 # Modules not configured
967 # ---------------------------------------------------------------------------
969 modules modules_install: FORCE
971 @echo "The present kernel configuration has modules disabled."
972 @echo "Type 'make config' and enable loadable module support."
973 @echo "Then build a kernel with module support enabled."
977 endif # CONFIG_MODULES
980 # Cleaning is done on three levels.
981 # make clean Delete most generated files
982 # Leave enough to build external modules
983 # make mrproper Delete the current configuration, and all generated files
984 # make distclean Remove editor backup files, patch leftover files and the like
986 # Directories & files removed with 'make clean'
987 CLEAN_DIRS += $(MODVERDIR)
988 CLEAN_FILES += vmlinux System.map \
989 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
991 # Directories & files removed with 'make mrproper'
992 MRPROPER_DIRS += include/config include2
993 MRPROPER_FILES += .config .config.old include/asm .version \
994 include/linux/autoconf.h include/linux/version.h \
995 Module.symvers tags TAGS cscope*
997 # clean - Delete most, but leave enough to build external modules
999 clean: rm-dirs := $(CLEAN_DIRS)
1000 clean: rm-files := $(CLEAN_FILES)
1001 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1003 .PHONY: $(clean-dirs) clean archclean
1005 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1007 clean: archclean $(clean-dirs)
1010 @find . $(RCS_FIND_IGNORE) \
1011 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1012 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1013 -type f -print | xargs rm -f
1015 # mrproper - Delete all generated files, including .config
1017 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1018 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1019 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1021 .PHONY: $(mrproper-dirs) mrproper archmrproper
1023 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1025 mrproper: clean archmrproper $(mrproper-dirs)
1034 @find $(srctree) $(RCS_FIND_IGNORE) \
1035 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1036 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1037 -o -name '.*.rej' -o -size 0 \
1038 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1039 -type f -print | xargs rm -f
1042 # Packaging of the kernel to various formats
1043 # ---------------------------------------------------------------------------
1044 # rpm target kept for backward compatibility
1045 package-dir := $(srctree)/scripts/package
1050 $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1052 $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1055 # Brief documentation of the typical targets used
1056 # ---------------------------------------------------------------------------
1058 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1059 boards := $(notdir $(boards))
1062 @echo 'Cleaning targets:'
1063 @echo ' clean - remove most generated files but keep the config'
1064 @echo ' mrproper - remove all generated files + config + various backup files'
1066 @echo 'Configuration targets:'
1067 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1069 @echo 'Other generic targets:'
1070 @echo ' all - Build all targets marked with [*]'
1071 @echo '* vmlinux - Build the bare kernel'
1072 @echo '* modules - Build all modules'
1073 @echo ' modules_install - Install all modules'
1074 @echo ' dir/ - Build all files in dir and below'
1075 @echo ' dir/file.[ois] - Build specified target only'
1076 @echo ' dir/file.ko - Build module including final link'
1077 @echo ' rpm - Build a kernel as an RPM package'
1078 @echo ' tags/TAGS - Generate tags file for editors'
1079 @echo ' cscope - Generate cscope index'
1080 @echo ' kernelrelease - Output the release version string'
1082 @echo 'Static analysers'
1083 @echo ' buildcheck - List dangling references to vmlinux discarded sections'
1084 @echo ' and init sections from non-init sections'
1085 @echo ' checkstack - Generate a list of stack hogs'
1086 @echo ' namespacecheck - Name space analysis on compiled kernel'
1088 @echo 'Kernel packaging:'
1089 @$(MAKE) -f $(package-dir)/Makefile help
1091 @echo 'Documentation targets:'
1092 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1094 @echo 'Architecture specific targets ($(ARCH)):'
1095 @$(if $(archhelp),$(archhelp),\
1096 echo ' No architecture specific help defined for $(ARCH)')
1099 $(foreach b, $(boards), \
1100 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1103 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1104 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1105 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse)'
1106 @echo ' make C=2 [targets] Force check of all c source with $$CHECK (sparse)'
1108 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1109 @echo 'For further info see the ./README file'
1112 # Documentation targets
1113 # ---------------------------------------------------------------------------
1114 %docs: scripts_basic FORCE
1115 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1117 else # KBUILD_EXTMOD
1120 # External module support.
1121 # When building external modules the kernel used as basis is considered
1122 # read-only, and no consistency checks are made and the make
1123 # system is not used on the basis kernel. If updates are required
1124 # in the basis kernel ordinary make commands (without M=...) must
1127 # The following are the only valid targets when building external
1129 # make M=dir clean Delete all automatically generated files
1130 # make M=dir modules Make all modules in specified dir
1131 # make M=dir Same as 'make M=dir modules'
1132 # make M=dir modules_install
1133 # Install the modules build in the module directory
1134 # Assumes install directory is already created
1136 # We are always building modules
1140 $(Q)mkdir -p $(MODVERDIR)
1142 .PHONY: $(objtree)/Module.symvers
1143 $(objtree)/Module.symvers:
1144 @test -e $(objtree)/Module.symvers || ( \
1146 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1147 echo " is missing; modules will have no dependencies and modversions."; \
1150 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1151 .PHONY: $(module-dirs) modules
1152 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1153 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1155 modules: $(module-dirs)
1156 @echo ' Building modules, stage 2.';
1157 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1159 .PHONY: modules_install
1161 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1163 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1165 .PHONY: $(clean-dirs) clean
1167 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1169 clean: rm-dirs := $(MODVERDIR)
1170 clean: $(clean-dirs)
1172 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1173 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1174 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1175 -type f -print | xargs rm -f
1178 @echo ' Building external modules.'
1179 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1181 @echo ' modules - default target, build the module(s)'
1182 @echo ' modules_install - install the module'
1183 @echo ' clean - remove generated files in module directory only'
1185 endif # KBUILD_EXTMOD
1187 # Generate tags for editors
1188 # ---------------------------------------------------------------------------
1190 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1191 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1192 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1194 ifeq ($(src),$(obj))
1197 __srctree = $(srctree)/
1200 ifeq ($(ALLSOURCE_ARCHS),)
1202 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1204 ALLINCLUDE_ARCHS := $(ARCH)
1207 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1208 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1211 ALLSOURCE_ARCHS := $(ARCH)
1214 ( find $(__srctree) $(RCS_FIND_IGNORE) \
1215 \( -name include -o -name arch \) -prune -o \
1216 -name '*.[chS]' -print; \
1217 for ARCH in $(ALLSOURCE_ARCHS) ; do \
1218 find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1219 -name '*.[chS]' -print; \
1221 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1222 -name '*.[chS]' -print; \
1223 find $(__srctree)include $(RCS_FIND_IGNORE) \
1224 \( -name config -o -name 'asm-*' \) -prune \
1225 -o -name '*.[chS]' -print; \
1226 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1227 find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1228 -name '*.[chS]' -print; \
1230 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1231 -name '*.[chS]' -print )
1234 quiet_cmd_cscope-file = FILELST cscope.files
1235 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1237 quiet_cmd_cscope = MAKE cscope.out
1238 cmd_cscope = cscope -b
1241 $(call cmd,cscope-file)
1244 quiet_cmd_TAGS = MAKE $@
1247 ETAGSF=`etags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL --extra=+f"`; \
1248 $(all-sources) | xargs etags $$ETAGSF -a
1255 quiet_cmd_tags = MAKE $@
1258 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL --extra=+f"`; \
1259 $(all-sources) | xargs ctags $$CTAGSF -a
1266 # Scripts to check various things for consistency
1267 # ---------------------------------------------------------------------------
1270 find * $(RCS_FIND_IGNORE) \
1271 -name '*.[hcS]' -type f -print | sort \
1272 | xargs $(PERL) -w scripts/checkincludes.pl
1275 find * $(RCS_FIND_IGNORE) \
1276 -name '*.[hcS]' -type f -print | sort \
1277 | xargs $(PERL) -w scripts/checkversion.pl
1280 $(PERL) $(srctree)/scripts/reference_discarded.pl
1281 $(PERL) $(srctree)/scripts/reference_init.pl
1284 $(PERL) $(srctree)/scripts/namespace.pl
1286 endif #ifeq ($(config-targets),1)
1287 endif #ifeq ($(mixed-targets),1)
1291 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1292 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1295 @echo $(KERNELRELEASE)
1297 # FIXME Should go into a make.lib or something
1298 # ===========================================================================
1300 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1301 cmd_rmdirs = rm -rf $(rm-dirs)
1303 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1304 cmd_rmfiles = rm -f $(rm-files)
1307 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1308 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1309 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1311 quiet_cmd_as_o_S = AS $@
1312 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1314 # read all saved command lines
1316 targets := $(wildcard $(sort $(targets)))
1317 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1319 ifneq ($(cmd_files),)
1320 $(cmd_files): ; # Do not try to update included dependency files
1321 include $(cmd_files)
1324 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1326 # $(Q)$(MAKE) $(clean)=dir
1327 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1329 endif # skip-makefile