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 := $(EXTRAVERSION)-omap1
16 # Do not print "Entering directory ..."
17 MAKEFLAGS += --no-print-directory
19 # We are using a recursive build, so we need to do a little thinking
20 # to get the ordering right.
22 # Most importantly: sub-Makefiles should only ever modify files in
23 # their own directory. If in some directory we have a dependency on
24 # a file in another dir (which doesn't happen often, but it's often
25 # unavoidable when linking the built-in.o targets which finally
26 # turn into vmlinux), we will call a sub make in that other dir, and
27 # after that we are sure that everything which is in that other dir
30 # The only cases where we need to modify files which have global
31 # effects are thus separated out and done before the recursive
32 # descending is started. They are now explicitly listed as the
35 # To put more focus on warnings, be less verbose as default
36 # Use 'make V=1' to see the full commands
39 ifeq ("$(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) KBUILD_VERBOSE=$(KBUILD_VERBOSE) \
117 KBUILD_CHECK=$(KBUILD_CHECK) KBUILD_EXTMOD="$(KBUILD_EXTMOD)" \
118 -f $(CURDIR)/Makefile $@
120 # Leave processing to above invocation of make
122 endif # ifneq ($(KBUILD_OUTPUT),)
123 endif # ifeq ($(KBUILD_SRC),)
125 # We process the rest of the Makefile if this is the final invocation of make
126 ifeq ($(skip-makefile),)
128 # If building an external module we do not care about the all: rule
129 # but instead _all depend on modules
131 ifeq ($(KBUILD_EXTMOD),)
137 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
139 # FIXME - TOPDIR is obsolete, use srctree/objtree
146 export srctree objtree VPATH TOPDIR
149 space := $(nullstring) # end of line
151 # Take the contents of any files called localversion* and the config
152 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. Be
153 # careful not to include files twice if building in the source
154 # directory. LOCALVERSION from the command line override all of this
156 localver := $(objtree)/localversion* $(srctree)/localversion*
157 localver := $(sort $(wildcard $(localver)))
158 # skip backup files (containing '~')
159 localver := $(foreach f, $(localver), $(if $(findstring ~, $(f)),,$(f)))
161 LOCALVERSION = $(subst $(space),, \
162 $(shell cat /dev/null $(localver)) \
163 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
165 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)
167 # SUBARCH tells the usermode build what the underlying arch is. That is set
168 # first, and if a usermode build is happening, the "ARCH=um" on the command
169 # line overrides the setting of ARCH below. If a native build is happening,
170 # then ARCH is assigned, getting whatever value it gets normally, and
171 # SUBARCH is subsequently ignored.
174 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
175 -e s/arm.*/arm/ -e s/sa110/arm/ \
176 -e s/s390x/s390/ -e s/parisc64/parisc/ )
179 # Cross compiling and selecting different set of gcc/bin-utils
180 # ---------------------------------------------------------------------------
182 # When performing cross compilation for other architectures ARCH shall be set
183 # to the target architecture. (See arch/* for the possibilities).
184 # ARCH can be set during invocation of make:
186 # Another way is to have ARCH set in the environment.
187 # The default ARCH is the host where make is executed.
189 # CROSS_COMPILE specify the prefix used for all executables used
190 # during compilation. Only gcc and related bin-utils executables
191 # are prefixed with $(CROSS_COMPILE).
192 # CROSS_COMPILE can be set on the command line
193 # make CROSS_COMPILE=ia64-linux-
194 # Alternatively CROSS_COMPILE can be set in the environment.
195 # Default value for CROSS_COMPILE is not to prefix executables
196 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
199 CROSS_COMPILE ?= arm-linux-
201 # Architecture as present in compile.h
202 UTS_MACHINE := $(ARCH)
204 # SHELL used by kbuild
205 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
206 else if [ -x /bin/bash ]; then echo /bin/bash; \
207 else echo sh; fi ; fi)
211 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
214 # Decide whether to build built-in, modular, or both.
215 # Normally, just do built-in.
220 # If we have only "make modules", don't compile built-in objects.
221 # When we're building modules with modversions, we need to consider
222 # the built-in objects during the descend as well, in order to
223 # make sure the checksums are uptodate before we record them.
225 ifeq ($(MAKECMDGOALS),modules)
226 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
229 # If we have "make <whatever> modules", compile modules
230 # in addition to whatever we do anyway.
231 # Just "make" or "make all" shall build modules as well
233 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
237 ifeq ($(MAKECMDGOALS),)
241 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
242 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
245 # ---------------------------------------------------------------------------
247 # Normally, we echo the whole command before executing it. By making
248 # that echo $($(quiet)$(cmd)), we now have the possibility to set
249 # $(quiet) to choose other forms of output instead, e.g.
251 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
252 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
254 # If $(quiet) is empty, the whole command will be printed.
255 # If it is set to "quiet_", only the short version will be printed.
256 # If it is set to "silent_", nothing wil be printed at all, since
257 # the variable $(silent_cmd_cc_o_c) doesn't exist.
259 # A simple variant is to prefix commands with $(Q) - that's usefull
260 # for commands that shall be hidden in non-verbose mode.
264 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
265 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
267 ifeq ($(KBUILD_VERBOSE),1)
275 # If the user is running make -s (silent mode), suppress echoing of
278 ifneq ($(findstring s,$(MAKEFLAGS)),)
282 export quiet Q KBUILD_VERBOSE
285 # cc support functions to be used (only) in arch/$(ARCH)/Makefile
286 # See documentation in Documentation/kbuild/makefiles.txt
289 # Usage: cflags-y += $(call gcc-option, -march=winchip-c6, -march=i586)
291 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
292 > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
294 # For backward compatibility
295 check_gcc = $(warning check_gcc is deprecated - use cc-option) \
296 $(call cc-option, $(1),$(2))
299 # Usage: flag := $(call cc-option-yn, -march=winchip-c6)
300 cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
301 > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
304 # Prefix align with either -falign or -malign
305 cc-option-align = $(subst -functions=0,,\
306 $(call cc-option,-falign-functions=0,-malign-functions=0))
309 # Usage gcc-ver := $(call cc-version $(CC))
310 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
311 $(if $(1), $(1), $(CC)))
314 # Look for make include files relative to root of kernel src
315 MAKEFLAGS += --include-dir=$(srctree)
317 # For maximum performance (+ possibly random breakage, uncomment
322 # Make variables (CC, etc...)
324 AS = $(CROSS_COMPILE)as
325 LD = $(CROSS_COMPILE)ld
326 CC = $(CROSS_COMPILE)gcc
328 AR = $(CROSS_COMPILE)ar
329 NM = $(CROSS_COMPILE)nm
330 STRIP = $(CROSS_COMPILE)strip
331 OBJCOPY = $(CROSS_COMPILE)objcopy
332 OBJDUMP = $(CROSS_COMPILE)objdump
334 GENKSYMS = scripts/genksyms/genksyms
335 DEPMOD = /sbin/depmod
336 KALLSYMS = scripts/kallsyms
340 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__
342 CFLAGS_MODULE = $(MODFLAGS)
343 AFLAGS_MODULE = $(MODFLAGS)
349 # Use LINUXINCLUDE when you must reference the include/ directory.
350 # Needed to be compatible with the O= option
351 LINUXINCLUDE := -Iinclude \
352 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
354 CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
356 CFLAGS := -Wall -Wstrict-prototypes -Wno-trigraphs \
357 -fno-strict-aliasing -fno-common \
359 AFLAGS := -D__ASSEMBLY__
361 export VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \
362 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
363 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
364 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
366 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
367 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
368 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
370 # When compiling out-of-tree modules, put MODVERDIR in the module
371 # tree rather than in the kernel tree. The kernel tree might
373 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
375 # The temporary file to save gcc -MD generated dependencies must not
378 depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
380 # Files to ignore in find ... statements
382 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc \) -prune -o
383 RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc
385 # ===========================================================================
386 # Rules shared between *config targets and build targets
388 # Basic helpers built in scripts/
389 .PHONY: scripts_basic
391 $(Q)$(MAKE) $(build)=scripts/basic
393 .PHONY: outputmakefile
394 # outputmakefile generate a Makefile to be placed in output directory, if
395 # using a seperate output directory. This allows convinient use
396 # of make in output directory
398 $(Q)if test ! $(srctree) -ef $(objtree); then \
399 $(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
400 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) \
401 > $(objtree)/Makefile; \
402 echo ' GEN $(objtree)/Makefile'; \
405 # To make sure we do not include .config for any of the *config targets
406 # catch them early, and hand them over to scripts/kconfig/Makefile
407 # It is allowed to specify more targets when calling make, including
408 # mixing *config targets and build targets.
409 # For example 'make oldconfig all'.
410 # Detect when mixed targets is specified, and make a second invocation
411 # of make so .config is not included in this case either (for *config).
413 no-dot-config-targets := clean mrproper distclean \
414 cscope TAGS tags help %docs check%
420 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
421 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
426 ifeq ($(KBUILD_EXTMOD),)
427 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
429 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
435 ifeq ($(mixed-targets),1)
436 # ===========================================================================
437 # We're called with mixed targets (*config and build targets).
438 # Handle them one by one.
441 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
444 ifeq ($(config-targets),1)
445 # ===========================================================================
446 # *config targets only - make sure prerequisites are updated, and descend
447 # in scripts/kconfig to make the *config target
449 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
450 # KBUILD_DEFCONFIG may point out an alternative default configuration
451 # used for 'make defconfig'
452 include $(srctree)/arch/$(ARCH)/Makefile
453 export KBUILD_DEFCONFIG
455 config: scripts_basic outputmakefile FORCE
456 $(Q)$(MAKE) $(build)=scripts/kconfig $@
457 %config: scripts_basic outputmakefile FORCE
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 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
502 # Dummy target needed, because used as prerequisite
503 include/linux/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 vmlinux but it is usually overriden in the arch makefile
512 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
518 #Add align options if CONFIG_CC_* is not equal to 0
519 add-align = $(if $(filter-out 0,$($(1))),$(cc-option-align)$(2)=$($(1)))
520 CFLAGS += $(call add-align,CONFIG_CC_ALIGN_FUNCTIONS,-functions)
521 CFLAGS += $(call add-align,CONFIG_CC_ALIGN_LABELS,-labels)
522 CFLAGS += $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
523 CFLAGS += $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
525 ifdef CONFIG_FRAME_POINTER
526 CFLAGS += -fno-omit-frame-pointer
528 CFLAGS += -fomit-frame-pointer
531 ifdef CONFIG_DEBUG_INFO
535 include $(srctree)/arch/$(ARCH)/Makefile
537 # arch Makefile may override CC so keep this after arch Makefile is included
538 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
539 CHECKFLAGS += $(NOSTDINC_FLAGS)
541 # warn about C99 declaration after statement
542 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
544 # disable pointer signedness warnings in gcc 4.0
545 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
547 # Default kernel image to build when no specific target is given.
548 # KBUILD_IMAGE may be overruled on the commandline or
549 # set in the environment
550 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
552 export KBUILD_IMAGE ?= vmlinux
555 # INSTALL_PATH specifies where to place the updated kernel and system map
556 # images. Default is /boot, but you can set it to other values
557 export INSTALL_PATH ?= /boot
560 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
561 # relocations required by build roots. This is not defined in the
562 # makefile but the arguement can be passed to make if needed.
565 MODLIB := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
569 ifeq ($(KBUILD_EXTMOD),)
570 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/
572 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
573 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
574 $(net-y) $(net-m) $(libs-y) $(libs-m)))
576 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
578 $(core-n) $(core-) $(drivers-n) $(drivers-) \
579 $(net-n) $(net-) $(libs-n) $(libs-))))
581 init-y := $(patsubst %/, %/built-in.o, $(init-y))
582 core-y := $(patsubst %/, %/built-in.o, $(core-y))
583 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
584 net-y := $(patsubst %/, %/built-in.o, $(net-y))
585 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
586 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
587 libs-y := $(libs-y1) $(libs-y2)
590 # ---------------------------------------------------------------------------
591 # vmlinux is build from the objects selected by $(vmlinux-init) and
592 # $(vmlinux-main). Most are built-in.o files from top-level directories
593 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
594 # Ordering when linking is important, and $(vmlinux-init) must be first.
599 # +-< $(vmlinux-init)
600 # | +--< init/version.o + more
602 # +--< $(vmlinux-main)
603 # | +--< driver/built-in.o mm/built-in.o + more
605 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
607 # vmlinux version (uname -v) cannot be updated during normal
608 # descending-into-subdirs phase since we do not yet know if we need to
610 # Therefore this step is delayed until just before final link of vmlinux -
611 # except in the kallsyms case where it is done just before adding the
612 # symbols to the kernel.
614 # System.map is generated to document addresses of all kernel symbols
616 vmlinux-init := $(head-y) $(init-y)
617 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
618 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
619 vmlinux-lds := arch/$(ARCH)/kernel/vmlinux.lds
621 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
622 # May be overridden by arch/$(ARCH)/Makefile
623 quiet_cmd_vmlinux__ ?= LD $@
624 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
625 -T $(vmlinux-lds) $(vmlinux-init) \
626 --start-group $(vmlinux-main) --end-group \
627 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
629 # Generate new vmlinux version
630 quiet_cmd_vmlinux_version = GEN .version
631 cmd_vmlinux_version = set -e; \
632 . $(srctree)/scripts/mkversion > .tmp_version; \
633 mv -f .tmp_version .version; \
634 $(MAKE) $(build)=init
636 # Generate System.map
637 quiet_cmd_sysmap = SYSMAP
638 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
641 # If CONFIG_KALLSYMS is set .version is already updated
642 # Generate System.map and verify that the content is consistent
644 define rule_vmlinux__
645 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
647 $(call cmd,vmlinux__)
648 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
650 $(Q)$(if $($(quiet)cmd_sysmap), \
651 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
652 $(cmd_sysmap) $@ System.map; \
653 if [ $$? -ne 0 ]; then \
661 ifdef CONFIG_KALLSYMS
662 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
663 # It's a three stage process:
664 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
666 # Running kallsyms on that gives us .tmp_kallsyms1.o with
667 # the right size - vmlinux version (uname -v) is updated during this step
668 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
669 # but due to the added section, some addresses have shifted.
670 # From here, we generate a correct .tmp_kallsyms2.o
671 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
672 # o Verify that the System.map from vmlinux matches the map from
673 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
674 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
675 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
676 # temporary bypass to allow the kernel to be built while the
677 # maintainers work out what went wrong with kallsyms.
679 ifdef CONFIG_KALLSYMS_EXTRA_PASS
685 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
687 define verify_kallsyms
688 $(Q)$(if $($(quiet)cmd_sysmap), \
689 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
690 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
691 $(Q)cmp -s System.map .tmp_System.map || \
692 (echo Inconsistent kallsyms data; \
693 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
694 rm .tmp_kallsyms* ; /bin/false )
697 # Update vmlinux version before link
698 # Use + in front of this rule to silent warning about make -j1
699 cmd_ksym_ld = $(cmd_vmlinux__)
701 +$(call cmd,vmlinux_version)
702 $(call cmd,vmlinux__)
703 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
706 # Generate .S file with all kernel symbols
707 quiet_cmd_kallsyms = KSYM $@
708 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
709 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
711 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
712 $(call if_changed_dep,as_o_S)
714 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
717 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
718 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
719 $(call if_changed_rule,ksym_ld)
721 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
722 $(call if_changed,vmlinux__)
724 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
725 $(call if_changed,vmlinux__)
727 # Needs to visit scripts/ before $(KALLSYMS) can be used.
728 $(KALLSYMS): scripts ;
730 endif # ifdef CONFIG_KALLSYMS
732 # vmlinux image - including updated kernel symbols
733 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
734 $(call if_changed_rule,vmlinux__)
736 # The actual objects are generated when descending,
737 # make sure no implicit rule kicks in
738 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
740 # Handle descending into subdirectories listed in $(vmlinux-dirs)
741 # Preset locale variables to speed up the build process. Limit locale
742 # tweaks to this spot to avoid wrong language settings when running
743 # make menuconfig etc.
744 # Error messages still appears in the original language
746 .PHONY: $(vmlinux-dirs)
747 $(vmlinux-dirs): prepare-all scripts
748 $(Q)$(MAKE) $(build)=$@
750 # Things we need to do before we recursively start building the kernel
751 # or the modules are listed in "prepare-all".
752 # A multi level approach is used. prepare1 is updated first, then prepare0.
753 # prepare-all is the collection point for the prepare targets.
755 .PHONY: prepare-all prepare prepare0 prepare1 prepare2
757 # prepare2 is used to check if we are building in a separate output directory,
759 # 1) Check that make has not been executed in the kernel src $(srctree)
760 # 2) Create the include2 directory, used for the second asm symlink
763 ifneq ($(KBUILD_SRC),)
764 @echo ' Using $(srctree) as source for kernel'
765 $(Q)if [ -h $(srctree)/include/asm -o -f $(srctree)/.config ]; then \
766 echo " $(srctree) is not clean, please run 'make mrproper'";\
767 echo " in the '$(srctree)' directory.";\
770 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
771 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
774 # prepare1 creates a makefile if using a separate output directory
775 prepare1: prepare2 outputmakefile
777 prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
778 ifneq ($(KBUILD_MODULES),)
779 $(Q)rm -rf $(MODVERDIR)
780 $(Q)mkdir -p $(MODVERDIR)
783 # All the preparing..
784 prepare-all: prepare0 prepare
786 # Leave this as default for preprocessing vmlinux.lds.S, which is now
787 # done in arch/$(ARCH)/kernel/Makefile
789 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
792 # ---------------------------------------------------------------------------
794 %.s: %.c scripts FORCE
795 $(Q)$(MAKE) $(build)=$(@D) $@
796 %.i: %.c scripts FORCE
797 $(Q)$(MAKE) $(build)=$(@D) $@
798 %.o: %.c scripts FORCE
799 $(Q)$(MAKE) $(build)=$(@D) $@
800 %/: scripts prepare FORCE
801 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
802 %.lst: %.c scripts FORCE
803 $(Q)$(MAKE) $(build)=$(@D) $@
804 %.s: %.S scripts FORCE
805 $(Q)$(MAKE) $(build)=$(@D) $@
806 %.o: %.S scripts FORCE
807 $(Q)$(MAKE) $(build)=$(@D) $@
809 # FIXME: The asm symlink changes when $(ARCH) changes. That's
810 # hard to detect, but I suppose "make mrproper" is a good idea
811 # before switching between archs anyway.
814 @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
815 $(Q)if [ ! -d include ]; then mkdir -p include; fi;
816 @ln -fsn asm-$(ARCH) $@
818 # Split autoconf.h into include/linux/config/*
820 include/config/MARKER: include/linux/autoconf.h
821 @echo ' SPLIT include/linux/autoconf.h -> include/config/*'
822 @scripts/basic/split-include include/linux/autoconf.h include/config
825 # Generate some files
826 # ---------------------------------------------------------------------------
828 # KERNELRELEASE can change from a few different places, meaning version.h
829 # needs to be updated, so this check is forced on all builds
833 define filechk_version.h
834 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
835 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
838 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
839 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
840 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
844 include/linux/version.h: $(srctree)/Makefile FORCE
845 $(call filechk,version.h)
847 # ---------------------------------------------------------------------------
851 @echo '*** Warning: make $@ is unnecessary now.'
853 # ---------------------------------------------------------------------------
858 # By default, build modules as well
865 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
866 @echo ' Building modules, stage 2.';
867 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
870 # Target to prepare building external modules
871 .PHONY: modules_prepare
872 modules_prepare: prepare-all scripts
874 # Target to install modules
875 .PHONY: modules_install
876 modules_install: _modinst_ _modinst_post
880 @if [ -z "`$(DEPMOD) -V | grep module-init-tools`" ]; then \
881 echo "Warning: you may need to install module-init-tools"; \
882 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
885 @rm -rf $(MODLIB)/kernel
886 @rm -f $(MODLIB)/source
887 @mkdir -p $(MODLIB)/kernel
888 @ln -s $(srctree) $(MODLIB)/source
889 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
890 rm -f $(MODLIB)/build ; \
891 ln -s $(objtree) $(MODLIB)/build ; \
893 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
895 # If System.map exists, run depmod. This deliberately does not have a
896 # dependency on System.map since that would run the dependency tree on
897 # vmlinux. This depmod is only for convenience to give the initial
898 # boot a modules.dep even before / is mounted read-write. However the
899 # boot script depmod is the master version.
900 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
903 depmod_opts := -b $(INSTALL_MOD_PATH) -r
905 .PHONY: _modinst_post
906 _modinst_post: _modinst_
907 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
909 else # CONFIG_MODULES
911 # Modules not configured
912 # ---------------------------------------------------------------------------
914 modules modules_install: FORCE
916 @echo "The present kernel configuration has modules disabled."
917 @echo "Type 'make config' and enable loadable module support."
918 @echo "Then build a kernel with module support enabled."
922 endif # CONFIG_MODULES
924 # Generate asm-offsets.h
925 # ---------------------------------------------------------------------------
927 define filechk_gen-asm-offsets
929 echo "#ifndef __ASM_OFFSETS_H__"; \
930 echo "#define __ASM_OFFSETS_H__"; \
932 echo " * DO NOT MODIFY."; \
934 echo " * This file was generated by arch/$(ARCH)/Makefile"; \
938 sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
945 # Cleaning is done on three levels.
946 # make clean Delete most generated files
947 # Leave enough to build external modules
948 # make mrproper Delete the current configuration, and all generated files
949 # make distclean Remove editor backup files, patch leftover files and the like
951 # Directories & files removed with 'make clean'
952 CLEAN_DIRS += $(MODVERDIR)
953 CLEAN_FILES += vmlinux System.map \
954 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
956 # Directories & files removed with 'make mrproper'
957 MRPROPER_DIRS += include/config include2
958 MRPROPER_FILES += .config .config.old include/asm .version \
959 include/linux/autoconf.h include/linux/version.h \
960 Module.symvers tags TAGS cscope*
962 # clean - Delete most, but leave enough to build external modules
964 clean: rm-dirs := $(CLEAN_DIRS)
965 clean: rm-files := $(CLEAN_FILES)
966 clean-dirs := $(addprefix _clean_,$(vmlinux-alldirs))
968 .PHONY: $(clean-dirs) clean archclean
970 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
972 clean: archclean $(clean-dirs)
975 @find . $(RCS_FIND_IGNORE) \
976 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
977 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
978 -type f -print | xargs rm -f
980 # mrproper - Delete all generated files, including .config
982 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
983 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
984 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
986 .PHONY: $(mrproper-dirs) mrproper archmrproper
988 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
990 mrproper: clean archmrproper $(mrproper-dirs)
999 @find $(srctree) $(RCS_FIND_IGNORE) \
1000 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1001 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1002 -o -name '.*.rej' -o -size 0 \
1003 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1004 -type f -print | xargs rm -f
1007 # Packaging of the kernel to various formats
1008 # ---------------------------------------------------------------------------
1009 # rpm target kept for backward compatibility
1010 package-dir := $(srctree)/scripts/package
1015 $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1017 $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1020 # Brief documentation of the typical targets used
1021 # ---------------------------------------------------------------------------
1023 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1024 boards := $(notdir $(boards))
1027 @echo 'Cleaning targets:'
1028 @echo ' clean - remove most generated files but keep the config'
1029 @echo ' mrproper - remove all generated files + config + various backup files'
1031 @echo 'Configuration targets:'
1032 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1034 @echo 'Other generic targets:'
1035 @echo ' all - Build all targets marked with [*]'
1036 @echo '* vmlinux - Build the bare kernel'
1037 @echo '* modules - Build all modules'
1038 @echo ' modules_install - Install all modules'
1039 @echo ' dir/ - Build all files in dir and below'
1040 @echo ' dir/file.[ois] - Build specified target only'
1041 @echo ' rpm - Build a kernel as an RPM package'
1042 @echo ' tags/TAGS - Generate tags file for editors'
1043 @echo ' cscope - Generate cscope index'
1045 @echo 'Static analysers'
1046 @echo ' buildcheck - List dangling references to vmlinux discarded sections'
1047 @echo ' and init sections from non-init sections'
1048 @echo ' checkstack - Generate a list of stack hogs'
1049 @echo ' namespacecheck - Name space analysis on compiled kernel'
1051 @echo 'Kernel packaging:'
1052 @$(MAKE) -f $(package-dir)/Makefile help
1054 @echo 'Documentation targets:'
1055 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1057 @echo 'Architecture specific targets ($(ARCH)):'
1058 @$(if $(archhelp),$(archhelp),\
1059 echo ' No architecture specific help defined for $(ARCH)')
1062 $(foreach b, $(boards), \
1063 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1066 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1067 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1068 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse)'
1069 @echo ' make C=2 [targets] Force check of all c source with $$CHECK (sparse)'
1071 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1072 @echo 'For further info see the ./README file'
1075 # Documentation targets
1076 # ---------------------------------------------------------------------------
1077 %docs: scripts_basic FORCE
1078 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1080 else # KBUILD_EXTMOD
1083 # External module support.
1084 # When building external modules the kernel used as basis is considered
1085 # read-only, and no consistency checks are made and the make
1086 # system is not used on the basis kernel. If updates are required
1087 # in the basis kernel ordinary make commands (without M=...) must
1090 # The following are the only valid targets when building external
1092 # make M=dir clean Delete all automatically generated files
1093 # make M=dir modules Make all modules in specified dir
1094 # make M=dir Same as 'make M=dir modules'
1095 # make M=dir modules_install
1096 # Install the modules build in the module directory
1097 # Assumes install directory is already created
1099 # We are always building modules
1103 $(Q)mkdir -p $(MODVERDIR)
1105 .PHONY: $(objtree)/Module.symvers
1106 $(objtree)/Module.symvers:
1107 @test -e $(objtree)/Module.symvers || ( \
1109 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1110 echo " is missing; modules will have no dependencies and modversions."; \
1113 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1114 .PHONY: $(module-dirs) modules
1115 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1116 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1118 modules: $(module-dirs)
1119 @echo ' Building modules, stage 2.';
1120 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1122 .PHONY: modules_install
1124 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1126 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1128 .PHONY: $(clean-dirs) clean
1130 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1132 clean: rm-dirs := $(MODVERDIR)
1133 clean: $(clean-dirs)
1135 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1136 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1137 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1138 -type f -print | xargs rm -f
1141 @echo ' Building external modules.'
1142 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1144 @echo ' modules - default target, build the module(s)'
1145 @echo ' modules_install - install the module'
1146 @echo ' clean - remove generated files in module directory only'
1148 endif # KBUILD_EXTMOD
1150 # Generate tags for editors
1151 # ---------------------------------------------------------------------------
1153 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1154 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1155 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1157 ifeq ($(KBUILD_OUTPUT),)
1160 __srctree = $(srctree)/
1164 ( find $(__srctree) $(RCS_FIND_IGNORE) \
1165 \( -name include -o -name arch \) -prune -o \
1166 -name '*.[chS]' -print; \
1167 find $(__srctree)arch/$(ARCH) $(RCS_FIND_IGNORE) \
1168 -name '*.[chS]' -print; \
1169 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1170 -name '*.[chS]' -print; \
1171 find $(__srctree)include $(RCS_FIND_IGNORE) \
1172 \( -name config -o -name 'asm-*' \) -prune \
1173 -o -name '*.[chS]' -print; \
1174 find $(__srctree)include/asm-$(ARCH) $(RCS_FIND_IGNORE) \
1175 -name '*.[chS]' -print; \
1176 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1177 -name '*.[chS]' -print )
1180 quiet_cmd_cscope-file = FILELST cscope.files
1181 cmd_cscope-file = $(all-sources) > cscope.files
1183 quiet_cmd_cscope = MAKE cscope.out
1184 cmd_cscope = cscope -k -b -q
1187 $(call cmd,cscope-file)
1190 quiet_cmd_TAGS = MAKE $@
1191 cmd_TAGS = $(all-sources) | etags -
1193 # Exuberant ctags works better with -I
1195 quiet_cmd_tags = MAKE $@
1198 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL --extra=+f"`; \
1199 $(all-sources) | xargs ctags $$CTAGSF -a
1209 # Scripts to check various things for consistency
1210 # ---------------------------------------------------------------------------
1213 find * $(RCS_FIND_IGNORE) \
1214 -name '*.[hcS]' -type f -print | sort \
1215 | xargs $(PERL) -w scripts/checkconfig.pl
1218 find * $(RCS_FIND_IGNORE) \
1219 -name '*.[hcS]' -type f -print | sort \
1220 | xargs $(PERL) -w scripts/checkincludes.pl
1223 find * $(RCS_FIND_IGNORE) \
1224 -name '*.[hcS]' -type f -print | sort \
1225 | xargs $(PERL) -w scripts/checkversion.pl
1228 $(PERL) $(srctree)/scripts/reference_discarded.pl
1229 $(PERL) $(srctree)/scripts/reference_init.pl
1232 $(PERL) $(srctree)/scripts/namespace.pl
1234 endif #ifeq ($(config-targets),1)
1235 endif #ifeq ($(mixed-targets),1)
1239 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1240 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1243 @echo $(KERNELRELEASE)
1245 # FIXME Should go into a make.lib or something
1246 # ===========================================================================
1248 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1249 cmd_rmdirs = rm -rf $(rm-dirs)
1251 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1252 cmd_rmfiles = rm -f $(rm-files)
1255 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1256 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1257 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1259 quiet_cmd_as_o_S = AS $@
1260 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1262 # read all saved command lines
1264 targets := $(wildcard $(sort $(targets)))
1265 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1267 ifneq ($(cmd_files),)
1268 $(cmd_files): ; # Do not try to update included dependency files
1269 include $(cmd_files)
1272 # Execute command and generate cmd file
1273 if_changed = $(if $(strip $? \
1274 $(filter-out $(cmd_$(1)),$(cmd_$@))\
1275 $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1277 $(if $($(quiet)cmd_$(1)),echo ' $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1279 echo 'cmd_$@ := $(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).cmd)
1282 # execute the command and also postprocess generated .d dependencies
1284 if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
1285 $(filter-out $(cmd_$(1)),$(cmd_$@))\
1286 $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1288 $(if $($(quiet)cmd_$(1)),echo ' $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1290 scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
1292 mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
1294 # Usage: $(call if_changed_rule,foo)
1295 # will check if $(cmd_foo) changed, or any of the prequisites changed,
1296 # and if so will execute $(rule_foo)
1298 if_changed_rule = $(if $(strip $? \
1299 $(filter-out $(cmd_$(1)),$(cmd_$(@F)))\
1300 $(filter-out $(cmd_$(@F)),$(cmd_$(1)))),\
1303 # If quiet is set, only print short version of command
1305 cmd = @$(if $($(quiet)cmd_$(1)),echo ' $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
1307 # filechk is used to check if the content of a generated file is updated.
1309 # define filechk_sample
1310 # echo $KERNELRELEASE
1312 # version.h : Makefile
1313 # $(call filechk,sample)
1314 # The rule defined shall write to stdout the content of the new file.
1315 # The existing file will be compared with the new one.
1316 # - If no file exist it is created
1317 # - If the content differ the new file is used
1318 # - If they are equal no change, and no timestamp update
1323 mkdir -p $(dir $@); \
1324 $(filechk_$(1)) < $< > $@.tmp; \
1325 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
1333 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1335 # $(Q)$(MAKE) $(build)=dir
1336 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
1338 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1340 # $(Q)$(MAKE) $(clean)=dir
1341 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1343 # $(call descend,<dir>,<target>)
1344 # Recursively call a sub-make in <dir> with target <target>
1345 # Usage is deprecated, because make does not see this as an invocation of make.
1346 descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
1348 endif # skip-makefile