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 # SUBARCH tells the usermode build what the underlying arch is. That is set
146 # first, and if a usermode build is happening, the "ARCH=um" on the command
147 # line overrides the setting of ARCH below. If a native build is happening,
148 # then ARCH is assigned, getting whatever value it gets normally, and
149 # SUBARCH is subsequently ignored.
151 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
152 -e s/arm.*/arm/ -e s/sa110/arm/ \
153 -e s/s390x/s390/ -e s/parisc64/parisc/ \
154 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
156 # Cross compiling and selecting different set of gcc/bin-utils
157 # ---------------------------------------------------------------------------
159 # When performing cross compilation for other architectures ARCH shall be set
160 # to the target architecture. (See arch/* for the possibilities).
161 # ARCH can be set during invocation of make:
163 # Another way is to have ARCH set in the environment.
164 # The default ARCH is the host where make is executed.
166 # CROSS_COMPILE specify the prefix used for all executables used
167 # during compilation. Only gcc and related bin-utils executables
168 # are prefixed with $(CROSS_COMPILE).
169 # CROSS_COMPILE can be set on the command line
170 # make CROSS_COMPILE=ia64-linux-
171 # Alternatively CROSS_COMPILE can be set in the environment.
172 # Default value for CROSS_COMPILE is not to prefix executables
173 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
178 # Architecture as present in compile.h
179 UTS_MACHINE := $(ARCH)
181 # SHELL used by kbuild
182 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
183 else if [ -x /bin/bash ]; then echo /bin/bash; \
184 else echo sh; fi ; fi)
186 # Decide whether to build built-in, modular, or both.
187 # Normally, just do built-in.
192 # If we have only "make modules", don't compile built-in objects.
193 # When we're building modules with modversions, we need to consider
194 # the built-in objects during the descend as well, in order to
195 # make sure the checksums are uptodate before we record them.
197 ifeq ($(MAKECMDGOALS),modules)
198 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
201 # If we have "make <whatever> modules", compile modules
202 # in addition to whatever we do anyway.
203 # Just "make" or "make all" shall build modules as well
205 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
209 ifeq ($(MAKECMDGOALS),)
213 export KBUILD_MODULES KBUILD_BUILTIN
214 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
217 # ---------------------------------------------------------------------------
219 # Normally, we echo the whole command before executing it. By making
220 # that echo $($(quiet)$(cmd)), we now have the possibility to set
221 # $(quiet) to choose other forms of output instead, e.g.
223 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
224 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
226 # If $(quiet) is empty, the whole command will be printed.
227 # If it is set to "quiet_", only the short version will be printed.
228 # If it is set to "silent_", nothing wil be printed at all, since
229 # the variable $(silent_cmd_cc_o_c) doesn't exist.
231 # A simple variant is to prefix commands with $(Q) - that's useful
232 # for commands that shall be hidden in non-verbose mode.
236 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
237 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
239 ifeq ($(KBUILD_VERBOSE),1)
247 # If the user is running make -s (silent mode), suppress echoing of
250 ifneq ($(findstring s,$(MAKEFLAGS)),)
254 export quiet Q KBUILD_VERBOSE
257 # Look for make include files relative to root of kernel src
258 MAKEFLAGS += --include-dir=$(srctree)
264 # We need some generic definitions
265 include $(srctree)/scripts/Kbuild.include
267 HOSTCFLAGS += $(call hostcc-option,-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer,)
270 # For maximum performance (+ possibly random breakage, uncomment
275 # Make variables (CC, etc...)
277 AS = $(CROSS_COMPILE)as
278 CC = $(CROSS_COMPILE)gcc
281 AR = $(CROSS_COMPILE)ar
282 NM = $(CROSS_COMPILE)nm
283 STRIP = $(CROSS_COMPILE)strip
284 OBJCOPY = $(CROSS_COMPILE)objcopy
285 OBJDUMP = $(CROSS_COMPILE)objdump
287 GENKSYMS = scripts/genksyms/genksyms
288 DEPMOD = /sbin/depmod
289 KALLSYMS = scripts/kallsyms
293 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
295 CFLAGS_MODULE = $(MODFLAGS)
296 AFLAGS_MODULE = $(MODFLAGS)
302 # Use LINUXINCLUDE when you must reference the include/ directory.
303 # Needed to be compatible with the O= option
305 CPPFLAGS := $(CPPFLAGS)
307 LDFLAGS := $(LDFLAGS)
310 # Read KERNELRELEASE from .kernelrelease (if it exists)
311 KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
312 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
314 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
315 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
316 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
317 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
319 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
320 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
321 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
324 # When compiling out-of-tree modules, put MODVERDIR in the module
325 # tree rather than in the kernel tree. The kernel tree might
327 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
329 # Files to ignore in find ... statements
331 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
332 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
334 # ===========================================================================
335 # Rules shared between *config targets and build targets
337 # Basic helpers built in scripts/
338 PHONY += scripts_basic
340 $(Q)$(MAKE) $(build)=scripts/basic
342 # To avoid any implicit rule to kick in, define an empty command.
343 scripts/basic/%: scripts_basic ;
345 PHONY += outputmakefile
346 # outputmakefile generates a Makefile in the output directory, if using a
347 # separate output directory. This allows convenient use of make in the
350 ifneq ($(KBUILD_SRC),)
351 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
352 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
355 # To make sure we do not include .config for any of the *config targets
356 # catch them early, and hand them over to scripts/kconfig/Makefile
357 # It is allowed to specify more targets when calling make, including
358 # mixing *config targets and build targets.
359 # For example 'make oldconfig all'.
360 # Detect when mixed targets is specified, and make a second invocation
361 # of make so .config is not included in this case either (for *config).
363 no-dot-config-targets := clean mrproper distclean \
364 cscope TAGS tags help %docs
365 #bbox# check% is removed from above
371 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
372 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
377 ifeq ($(KBUILD_EXTMOD),)
378 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
380 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
386 ifeq ($(mixed-targets),1)
387 # ===========================================================================
388 # We're called with mixed targets (*config and build targets).
389 # Handle them one by one.
392 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
395 ifeq ($(config-targets),1)
396 # ===========================================================================
397 # *config targets only - make sure prerequisites are updated, and descend
398 # in scripts/kconfig to make the *config target
400 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
401 # KBUILD_DEFCONFIG may point out an alternative default configuration
402 # used for 'make defconfig'
403 -include $(srctree)/arch/$(ARCH)/Makefile
404 export KBUILD_DEFCONFIG
406 config %config: scripts_basic outputmakefile FORCE
408 $(Q)$(MAKE) $(build)=scripts/kconfig $@
409 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
412 # ===========================================================================
413 # Build targets only - this includes busybox, arch specific targets, clean
414 # targets and others. In general all targets except *config targets.
416 ifeq ($(KBUILD_EXTMOD),)
417 # Additional helpers built in scripts/
418 # Carefully list dependencies so we do not try to build scripts twice
421 scripts: scripts_basic include/config/MARKER
422 $(Q)$(MAKE) $(build)=$(@)
424 scripts_basic: include/autoconf.h
426 # Objects we will link into busybox / subdirs we need to visit
432 archival/libunarchive/ \
435 coreutils/libcoreutils/ \
447 networking/libiproute/ \
456 util-linux/volume_id/ \
458 endif # KBUILD_EXTMOD
460 ifeq ($(dot-config),1)
461 # In this section, we need .config
463 # Read in dependencies to all Kconfig* files, make sure to run
464 # oldconfig if changes are detected.
469 # If .config needs to be updated, it will be done via the dependency
470 # that autoconf has on .config.
471 # To avoid any implicit rule to kick in, define an empty command
472 .config .kconfig.d: ;
474 # Now we can define CFLAGS etc according to .config
475 include $(srctree)/Makefile.flags
477 # If .config is newer than include/autoconf.h, someone tinkered
478 # with it and forgot to run make oldconfig.
479 # If kconfig.d is missing then we are probarly in a cleaned tree so
480 # we execute the config step to be sure to catch updated Kconfig files
481 include/autoconf.h: .kconfig.d .config
482 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
485 # Dummy target needed, because used as prerequisite
486 include/autoconf.h: ;
489 # The all: target is the default when no target is given on the
491 # This allow a user to issue only 'make' to build a kernel including modules
492 # Defaults busybox but it is usually overridden in the arch makefile
495 -include $(srctree)/arch/$(ARCH)/Makefile
497 # arch Makefile may override CC so keep this after arch Makefile is included
498 #bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
499 CHECKFLAGS += $(NOSTDINC_FLAGS)
501 # Default kernel image to build when no specific target is given.
502 # KBUILD_IMAGE may be overruled on the commandline or
503 # set in the environment
504 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
506 export KBUILD_IMAGE ?= busybox
509 # INSTALL_PATH specifies where to place the updated kernel and system map
510 # images. Default is /boot, but you can set it to other values
511 export INSTALL_PATH ?= /boot
514 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
515 # relocations required by build roots. This is not defined in the
516 # makefile but the arguement can be passed to make if needed.
519 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
523 ifeq ($(KBUILD_EXTMOD),)
524 busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
526 busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
527 $(core-n) $(core-) $(libs-n) $(libs-) \
530 core-y := $(patsubst %/, %/built-in.o, $(core-y))
531 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
532 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
533 libs-y := $(libs-y1) $(libs-y2)
536 # ---------------------------------------------------------------------------
537 # busybox is build from the objects selected by $(busybox-init) and
538 # $(busybox-main). Most are built-in.o files from top-level directories
539 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
540 # Ordering when linking is important, and $(busybox-init) must be first.
545 # +-< $(busybox-init)
546 # | +--< init/version.o + more
548 # +--< $(busybox-main)
549 # | +--< driver/built-in.o mm/built-in.o + more
551 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
553 # busybox version (uname -v) cannot be updated during normal
554 # descending-into-subdirs phase since we do not yet know if we need to
556 # Therefore this step is delayed until just before final link of busybox -
557 # except in the kallsyms case where it is done just before adding the
558 # symbols to the kernel.
560 # System.map is generated to document addresses of all kernel symbols
562 busybox-all := $(core-y) $(libs-y)
564 # Rule to link busybox - also used during CONFIG_KALLSYMS
565 # May be overridden by arch/$(ARCH)/Makefile
566 quiet_cmd_busybox__ ?= LINK $@
567 cmd_busybox__ ?= $(srctree)/scripts/trylink \
571 "$(LDFLAGS) $(EXTRA_LDFLAGS)" \
576 # Generate System.map
577 quiet_cmd_sysmap = SYSMAP
578 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
581 # If CONFIG_KALLSYMS is set .version is already updated
582 # Generate System.map and verify that the content is consistent
583 # Use + in front of the busybox_version rule to silent warning with make -j2
584 # First command is ':' to allow us to use + in front of the rule
585 define rule_busybox__
587 $(call cmd,busybox__)
588 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
592 ifdef CONFIG_KALLSYMS
593 # Generate section listing all symbols and add it into busybox $(kallsyms.o)
594 # It's a three stage process:
595 # o .tmp_busybox1 has all symbols and sections, but __kallsyms is
597 # Running kallsyms on that gives us .tmp_kallsyms1.o with
598 # the right size - busybox version (uname -v) is updated during this step
599 # o .tmp_busybox2 now has a __kallsyms section of the right size,
600 # but due to the added section, some addresses have shifted.
601 # From here, we generate a correct .tmp_kallsyms2.o
602 # o The correct .tmp_kallsyms2.o is linked into the final busybox.
603 # o Verify that the System.map from busybox matches the map from
604 # .tmp_busybox2, just in case we did not generate kallsyms correctly.
605 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
606 # .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a
607 # temporary bypass to allow the kernel to be built while the
608 # maintainers work out what went wrong with kallsyms.
610 ifdef CONFIG_KALLSYMS_EXTRA_PASS
616 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
618 define verify_kallsyms
619 $(Q)$(if $($(quiet)cmd_sysmap), \
620 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
621 $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
622 $(Q)cmp -s System.map .tmp_System.map || \
623 (echo Inconsistent kallsyms data; \
624 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
625 rm .tmp_kallsyms* ; /bin/false )
628 # Update busybox version before link
629 # Use + in front of this rule to silent warning about make -j1
630 # First command is ':' to allow us to use + in front of this rule
631 cmd_ksym_ld = $(cmd_busybox__)
634 +$(call cmd,busybox_version)
635 $(call cmd,busybox__)
636 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
639 # Generate .S file with all kernel symbols
640 quiet_cmd_kallsyms = KSYM $@
641 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
642 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
644 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
645 $(call if_changed_dep,as_o_S)
647 .tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
650 # .tmp_busybox1 must be complete except kallsyms, so update busybox version
651 .tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
652 $(call if_changed_rule,ksym_ld)
654 .tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
655 $(call if_changed,busybox__)
657 .tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
658 $(call if_changed,busybox__)
660 # Needs to visit scripts/ before $(KALLSYMS) can be used.
661 $(KALLSYMS): scripts ;
663 # Generate some data for debugging strange kallsyms problems
664 debug_kallsyms: .tmp_map$(last_kallsyms)
666 .tmp_map%: .tmp_busybox% FORCE
667 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
673 endif # ifdef CONFIG_KALLSYMS
675 # busybox image - including updated kernel symbols
676 busybox_unstripped: $(busybox-all) FORCE
677 $(call if_changed_rule,busybox__)
678 $(Q)rm -f .old_version
680 busybox: busybox_unstripped
681 ifeq ($(SKIP_STRIP),y)
684 $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \
685 busybox_unstripped -o $@
688 # The actual objects are generated when descending,
689 # make sure no implicit rule kicks in
690 $(sort $(busybox-all)): $(busybox-dirs) ;
692 # Handle descending into subdirectories listed in $(busybox-dirs)
693 # Preset locale variables to speed up the build process. Limit locale
694 # tweaks to this spot to avoid wrong language settings when running
695 # make menuconfig etc.
696 # Error messages still appears in the original language
698 PHONY += $(busybox-dirs)
699 $(busybox-dirs): prepare scripts
700 $(Q)$(MAKE) $(build)=$@
702 # Build the kernel release string
703 # The KERNELRELEASE is stored in a file named .kernelrelease
704 # to be used when executing for example make install or make modules_install
706 # Take the contents of any files called localversion* and the config
707 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
708 # LOCALVERSION from the command line override all of this
711 space := $(nullstring) # end of line
713 ___localver = $(objtree)/localversion* $(srctree)/localversion*
714 __localver = $(sort $(wildcard $(___localver)))
715 # skip backup files (containing '~')
716 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
718 localver = $(subst $(space),, \
719 $(shell cat /dev/null $(_localver)) \
720 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
722 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
723 # and if the SCM is know a tag from the SCM is appended.
724 # The appended tag is determinded by the SCM used.
726 # Currently, only git is supported.
727 # Other SCMs can edit scripts/setlocalversion and add the appropriate
729 ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO
730 _localver-auto = $(shell $(CONFIG_SHELL) \
731 $(srctree)/scripts/setlocalversion $(srctree))
732 localver-auto = $(LOCALVERSION)$(_localver-auto)
735 localver-full = $(localver)$(localver-auto)
737 # Store (new) KERNELRELASE string in .kernelrelease
738 kernelrelease = $(KERNELVERSION)$(localver-full)
739 .kernelrelease: FORCE
741 $(Q)echo $(kernelrelease) > $@
744 # Things we need to do before we recursively start building the kernel
745 # or the modules are listed in "prepare".
746 # A multi level approach is used. prepareN is processed before prepareN-1.
747 # archprepare is used in arch Makefiles and when processed asm symlink,
748 # version.h and scripts_basic is processed / created.
750 # Listed in dependency order
751 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
753 # prepare-all is deprecated, use prepare as valid replacement
756 # prepare3 is used to check if we are building in a separate output directory,
758 # 1) Check that make has not been executed in the kernel src $(srctree)
759 # 2) Create the include2 directory, used for the second asm symlink
760 prepare3: .kernelrelease
761 ifneq ($(KBUILD_SRC),)
762 @echo ' Using $(srctree) as source for busybox'
763 $(Q)if [ -f $(srctree)/.config ]; then \
764 echo " $(srctree) is not clean, please run 'make mrproper'";\
765 echo " in the '$(srctree)' directory.";\
768 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
769 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
772 # prepare2 creates a makefile if using a separate output directory
773 prepare2: prepare3 outputmakefile
775 prepare1: prepare2 include/config/MARKER
776 ifneq ($(KBUILD_MODULES),)
777 $(Q)mkdir -p $(MODVERDIR)
778 $(Q)rm -f $(MODVERDIR)/*
781 archprepare: prepare1 scripts_basic
783 prepare0: archprepare FORCE
784 $(Q)$(MAKE) $(build)=.
786 # All the preparing..
787 prepare prepare-all: prepare0
789 # Leave this as default for preprocessing busybox.lds.S, which is now
790 # done in arch/$(ARCH)/kernel/Makefile
792 export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
794 # FIXME: The asm symlink changes when $(ARCH) changes. That's
795 # hard to detect, but I suppose "make mrproper" is a good idea
796 # before switching between archs anyway.
799 #bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
800 #bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi;
801 #bbox# @ln -fsn asm-$(ARCH) $@
803 # Split autoconf.h into include/linux/config/*
804 quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h
805 cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs > include/bbconfigopts.h
806 quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/*
807 cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config
808 #bbox# piggybacked generation of few .h files
809 include/config/MARKER: scripts/basic/split-include include/autoconf.h
810 $(call cmd,split_autoconf)
811 $(call cmd,gen_bbconfigopts)
814 # Generate some files
815 # ---------------------------------------------------------------------------
817 # KERNELRELEASE can change from a few different places, meaning version.h
818 # needs to be updated, so this check is forced on all builds
822 define filechk_version.h
823 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
824 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
827 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
828 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
829 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
833 # ---------------------------------------------------------------------------
837 @echo '*** Warning: make $@ is unnecessary now.'
839 # ---------------------------------------------------------------------------
842 ifdef _BB_DISABLED_CONFIG_MODULES
844 # By default, build modules as well
851 modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
852 @echo ' Building modules, stage 2.';
853 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
856 # Target to prepare building external modules
857 PHONY += modules_prepare
858 modules_prepare: prepare scripts
860 # Target to install modules
861 PHONY += modules_install
862 modules_install: _modinst_ _modinst_post
866 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
867 echo "Warning: you may need to install module-init-tools"; \
868 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
871 @rm -rf $(MODLIB)/kernel
872 @rm -f $(MODLIB)/source
873 @mkdir -p $(MODLIB)/kernel
874 @ln -s $(srctree) $(MODLIB)/source
875 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
876 rm -f $(MODLIB)/build ; \
877 ln -s $(objtree) $(MODLIB)/build ; \
879 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
881 # If System.map exists, run depmod. This deliberately does not have a
882 # dependency on System.map since that would run the dependency tree on
883 # busybox. This depmod is only for convenience to give the initial
884 # boot a modules.dep even before / is mounted read-write. However the
885 # boot script depmod is the master version.
886 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
889 depmod_opts := -b $(INSTALL_MOD_PATH) -r
891 PHONY += _modinst_post
892 _modinst_post: _modinst_
893 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
895 else # CONFIG_MODULES
897 # Modules not configured
898 # ---------------------------------------------------------------------------
900 modules modules_install: FORCE
902 @echo "The present busybox configuration has modules disabled."
903 @echo "Type 'make config' and enable loadable module support."
904 @echo "Then build a kernel with module support enabled."
908 endif # CONFIG_MODULES
911 # Cleaning is done on three levels.
912 # make clean Delete most generated files
913 # Leave enough to build external modules
914 # make mrproper Delete the current configuration, and all generated files
915 # make distclean Remove editor backup files, patch leftover files and the like
917 # Directories & files removed with 'make clean'
918 CLEAN_DIRS += $(MODVERDIR)
919 CLEAN_FILES += busybox* System.map .kernelrelease \
920 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
922 # Directories & files removed with 'make mrproper'
923 MRPROPER_DIRS += include/config include2
924 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
926 include/bbconfigopts.h \
927 include/usage_compressed.h \
928 include/applet_tables.h \
930 .kernelrelease Module.symvers tags TAGS cscope*
932 # clean - Delete most, but leave enough to build external modules
934 clean: rm-dirs := $(CLEAN_DIRS)
935 clean: rm-files := $(CLEAN_FILES)
936 clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
938 PHONY += $(clean-dirs) clean archclean
940 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
942 clean: archclean $(clean-dirs)
945 @find . $(RCS_FIND_IGNORE) \
946 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
947 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
948 -type f -print | xargs rm -f
950 # mrproper - Delete all generated files, including .config
952 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
953 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
954 mrproper-dirs := $(addprefix _mrproper_,scripts)
956 PHONY += $(mrproper-dirs) mrproper archmrproper
958 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
960 mrproper: clean archmrproper $(mrproper-dirs)
969 @find $(srctree) $(RCS_FIND_IGNORE) \
970 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
971 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
972 -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \
973 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
974 -type f -print | xargs rm -f
977 # Packaging of the kernel to various formats
978 # ---------------------------------------------------------------------------
979 # rpm target kept for backward compatibility
980 package-dir := $(srctree)/scripts/package
983 $(Q)$(MAKE) $(build)=$(package-dir) $@
985 $(Q)$(MAKE) $(build)=$(package-dir) $@
988 # Brief documentation of the typical targets used
989 # ---------------------------------------------------------------------------
991 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
992 boards := $(notdir $(boards))
994 -include $(srctree)/Makefile.help
996 # Documentation targets
997 # ---------------------------------------------------------------------------
998 %docs: scripts_basic FORCE
999 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1001 else # KBUILD_EXTMOD
1004 # External module support.
1005 # When building external modules the kernel used as basis is considered
1006 # read-only, and no consistency checks are made and the make
1007 # system is not used on the basis kernel. If updates are required
1008 # in the basis kernel ordinary make commands (without M=...) must
1011 # The following are the only valid targets when building external
1013 # make M=dir clean Delete all automatically generated files
1014 # make M=dir modules Make all modules in specified dir
1015 # make M=dir Same as 'make M=dir modules'
1016 # make M=dir modules_install
1017 # Install the modules build in the module directory
1018 # Assumes install directory is already created
1020 # We are always building modules
1022 PHONY += crmodverdir
1024 $(Q)mkdir -p $(MODVERDIR)
1025 $(Q)rm -f $(MODVERDIR)/*
1027 PHONY += $(objtree)/Module.symvers
1028 $(objtree)/Module.symvers:
1029 @test -e $(objtree)/Module.symvers || ( \
1031 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1032 echo " is missing; modules will have no dependencies and modversions."; \
1035 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1036 PHONY += $(module-dirs) modules
1037 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1038 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1040 modules: $(module-dirs)
1041 @echo ' Building modules, stage 2.';
1042 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1044 PHONY += modules_install
1045 modules_install: _emodinst_ _emodinst_post
1047 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1050 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1051 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1053 # Run depmod only is we have System.map and depmod is executable
1054 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1055 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1056 $(DEPMOD) -ae -F System.map \
1057 $(if $(strip $(INSTALL_MOD_PATH)), \
1058 -b $(INSTALL_MOD_PATH) -r) \
1062 PHONY += _emodinst_post
1063 _emodinst_post: _emodinst_
1066 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1068 PHONY += $(clean-dirs) clean
1070 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1072 clean: rm-dirs := $(MODVERDIR)
1073 clean: $(clean-dirs)
1075 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1076 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1077 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1078 -type f -print | xargs rm -f
1081 @echo ' Building external modules.'
1082 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1084 @echo ' modules - default target, build the module(s)'
1085 @echo ' modules_install - install the module'
1086 @echo ' clean - remove generated files in module directory only'
1090 PHONY += prepare scripts
1093 endif # KBUILD_EXTMOD
1095 # Generate tags for editors
1096 # ---------------------------------------------------------------------------
1098 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1099 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1100 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1102 ifeq ($(src),$(obj))
1105 __srctree = $(srctree)/
1108 ifeq ($(ALLSOURCE_ARCHS),)
1110 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1112 ALLINCLUDE_ARCHS := $(ARCH)
1115 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1116 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1119 ALLSOURCE_ARCHS := $(ARCH)
1122 ( find $(__srctree) $(RCS_FIND_IGNORE) \
1123 \( -name include -o -name arch \) -prune -o \
1124 -name '*.[chS]' -print; \
1125 for ARCH in $(ALLSOURCE_ARCHS) ; do \
1126 find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1127 -name '*.[chS]' -print; \
1129 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1130 -name '*.[chS]' -print; \
1131 find $(__srctree)include $(RCS_FIND_IGNORE) \
1132 \( -name config -o -name 'asm-*' \) -prune \
1133 -o -name '*.[chS]' -print; \
1134 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1135 find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1136 -name '*.[chS]' -print; \
1138 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1139 -name '*.[chS]' -print )
1142 quiet_cmd_cscope-file = FILELST cscope.files
1143 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1145 quiet_cmd_cscope = MAKE cscope.out
1146 cmd_cscope = cscope -b
1149 $(call cmd,cscope-file)
1152 quiet_cmd_TAGS = MAKE $@
1155 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
1156 echo "-I __initdata,__exitdata,__acquires,__releases \
1157 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1158 --extra=+f --c-kinds=+px"`; \
1159 $(all-sources) | xargs etags $$ETAGSF -a
1166 quiet_cmd_tags = MAKE $@
1169 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
1170 echo "-I __initdata,__exitdata,__acquires,__releases \
1171 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1172 --extra=+f --c-kinds=+px"`; \
1173 $(all-sources) | xargs ctags $$CTAGSF -a
1180 # Scripts to check various things for consistency
1181 # ---------------------------------------------------------------------------
1184 find * $(RCS_FIND_IGNORE) \
1185 -name '*.[hcS]' -type f -print | sort \
1186 | xargs $(PERL) -w scripts/checkincludes.pl
1189 find * $(RCS_FIND_IGNORE) \
1190 -name '*.[hcS]' -type f -print | sort \
1191 | xargs $(PERL) -w scripts/checkversion.pl
1194 $(PERL) $(srctree)/scripts/namespace.pl
1196 endif #ifeq ($(config-targets),1)
1197 endif #ifeq ($(mixed-targets),1)
1201 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
1202 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1205 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1206 $(error kernelrelease not valid - run 'make *config' to update it))
1208 @echo $(KERNELVERSION)
1211 # ---------------------------------------------------------------------------
1212 # Single targets are compatible with:
1213 # - build whith mixed source and output
1214 # - build with separate output dir 'make O=...'
1215 # - external modules
1217 # target-dir => where to store outputfile
1218 # build-dir => directory in kernel source tree to use
1220 ifeq ($(KBUILD_EXTMOD),)
1221 build-dir = $(patsubst %/,%,$(dir $@))
1222 target-dir = $(dir $@)
1224 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1225 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1226 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1229 %.s: %.c prepare scripts FORCE
1230 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1231 %.i: %.c prepare scripts FORCE
1232 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1233 %.o: %.c prepare scripts FORCE
1234 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1235 %.lst: %.c prepare scripts FORCE
1236 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1237 %.s: %.S prepare scripts FORCE
1238 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1239 %.o: %.S prepare scripts FORCE
1240 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1243 / %/: prepare scripts FORCE
1244 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1245 $(build)=$(build-dir)
1246 %.ko: prepare scripts FORCE
1247 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1248 $(build)=$(build-dir) $(@:.ko=.o)
1249 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1251 # FIXME Should go into a make.lib or something
1252 # ===========================================================================
1254 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1255 cmd_rmdirs = rm -rf $(rm-dirs)
1257 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1258 cmd_rmfiles = rm -f $(rm-files)
1261 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1262 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1263 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1265 quiet_cmd_as_o_S = AS $@
1266 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1268 # read all saved command lines
1270 targets := $(wildcard $(sort $(targets)))
1271 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1273 ifneq ($(cmd_files),)
1274 $(cmd_files): ; # Do not try to update included dependency files
1275 include $(cmd_files)
1278 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1280 # $(Q)$(MAKE) $(clean)=dir
1281 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1283 endif # skip-makefile
1288 -include $(srctree)/Makefile.custom
1290 # Declare the contents of the .PHONY variable as phony. We keep that
1291 # information in a variable se we can use it in if_changed and friends.