8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
13 # Do not print "Entering directory ..."
14 MAKEFLAGS += --no-print-directory
16 # We are using a recursive build, so we need to do a little thinking
17 # to get the ordering right.
19 # Most importantly: sub-Makefiles should only ever modify files in
20 # their own directory. If in some directory we have a dependency on
21 # a file in another dir (which doesn't happen often, but it's often
22 # unavoidable when linking the built-in.o targets which finally
23 # turn into busybox), we will call a sub make in that other dir, and
24 # after that we are sure that everything which is in that other dir
27 # The only cases where we need to modify files which have global
28 # effects are thus separated out and done before the recursive
29 # descending is started. They are now explicitly listed as the
32 # To put more focus on warnings, be less verbose as default
33 # Use 'make V=1' to see the full commands
36 ifeq ("$(origin V)", "command line")
44 # Call sparse as part of compilation of C files
45 # Use 'make C=1' to enable sparse checking
48 ifeq ("$(origin C)", "command line")
49 KBUILD_CHECKSRC = $(C)
52 ifndef KBUILD_CHECKSRC
56 # Use make M=dir to specify directory of external module to build
57 # Old syntax make ... SUBDIRS=$PWD is still supported
58 # Setting the environment variable KBUILD_EXTMOD take precedence
60 KBUILD_EXTMOD ?= $(SUBDIRS)
63 ifeq ("$(origin M)", "command line")
69 # kbuild supports saving output files in a separate directory.
70 # To locate output files in a separate directory two syntaxes are supported.
71 # In both cases the working directory must be the root of the kernel src.
73 # Use "make O=dir/to/store/output/files/"
75 # 2) Set KBUILD_OUTPUT
76 # Set the environment variable KBUILD_OUTPUT to point to the directory
77 # where the output files shall be placed.
78 # export KBUILD_OUTPUT=dir/to/store/output/files/
81 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
85 # KBUILD_SRC is set on invocation of make in OBJ directory
86 # KBUILD_SRC is not intended to be used by the regular user (for now)
89 # OK, Make called in directory where kernel src resides
90 # Do we want to locate output files in a separate directory?
92 ifeq ("$(origin O)", "command line")
97 # That's our default target when none is given on the command line
101 ifneq ($(KBUILD_OUTPUT),)
102 # Invoke a second make in the output directory, passing relevant variables
103 # check that the output directory actually exists
104 saved-output := $(KBUILD_OUTPUT)
105 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
106 $(if $(KBUILD_OUTPUT),, \
107 $(error output directory "$(saved-output)" does not exist))
109 PHONY += $(MAKECMDGOALS)
111 $(filter-out _all,$(MAKECMDGOALS)) _all:
112 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
113 KBUILD_SRC=$(CURDIR) \
114 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
116 # Leave processing to above invocation of make
118 endif # ifneq ($(KBUILD_OUTPUT),)
119 endif # ifeq ($(KBUILD_SRC),)
121 # We process the rest of the Makefile if this is the final invocation of make
122 ifeq ($(skip-makefile),)
124 # If building an external module we do not care about the all: rule
125 # but instead _all depend on modules
127 ifeq ($(KBUILD_EXTMOD),)
133 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
135 # FIXME - TOPDIR is obsolete, use srctree/objtree
140 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
142 export srctree objtree VPATH TOPDIR
145 # Cross compiling and selecting different set of gcc/bin-utils
146 # ---------------------------------------------------------------------------
148 # When performing cross compilation for other architectures ARCH shall be set
149 # to the target architecture. (See arch/* for the possibilities).
150 # ARCH can be set during invocation of make:
152 # Another way is to have ARCH set in the environment.
153 # The default ARCH is the host where make is executed.
155 # CROSS_COMPILE specify the prefix used for all executables used
156 # during compilation. Only gcc and related bin-utils executables
157 # are prefixed with $(CROSS_COMPILE).
158 # CROSS_COMPILE can be set on the command line
159 # make CROSS_COMPILE=ia64-linux-
160 # Alternatively CROSS_COMPILE can be set in the environment.
161 # Default value for CROSS_COMPILE is not to prefix executables
162 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
165 # bbox: we may have CONFIG_CROSS_COMPILER_PREFIX in .config,
166 # and it has not been included yet... thus using an awkward syntax.
167 ifeq ($(CROSS_COMPILE),)
168 CROSS_COMPILE := $(shell grep ^CONFIG_CROSS_COMPILER_PREFIX .config 2>/dev/null)
169 CROSS_COMPILE := $(subst CONFIG_CROSS_COMPILER_PREFIX=,,$(CROSS_COMPILE))
170 CROSS_COMPILE := $(subst ",,$(CROSS_COMPILE))
173 # SUBARCH tells the usermode build what the underlying arch is. That is set
174 # first, and if a usermode build is happening, the "ARCH=um" on the command
175 # line overrides the setting of ARCH below. If a native build is happening,
176 # then ARCH is assigned, getting whatever value it gets normally, and
177 # SUBARCH is subsequently ignored.
179 ifneq ($(CROSS_COMPILE),)
180 SUBARCH := $(shell echo $(CROSS_COMPILE) | cut -d- -f1)
182 SUBARCH := $(shell uname -m)
184 SUBARCH := $(shell echo $(SUBARCH) | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
185 -e s/arm.*/arm/ -e s/sa110/arm/ \
186 -e s/s390x/s390/ -e s/parisc64/parisc/ \
187 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
191 # Architecture as present in compile.h
192 UTS_MACHINE := $(ARCH)
194 # SHELL used by kbuild
195 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
196 else if [ -x /bin/bash ]; then echo /bin/bash; \
197 else echo sh; fi ; fi)
199 # Decide whether to build built-in, modular, or both.
200 # Normally, just do built-in.
205 # If we have only "make modules", don't compile built-in objects.
206 # When we're building modules with modversions, we need to consider
207 # the built-in objects during the descend as well, in order to
208 # make sure the checksums are uptodate before we record them.
210 ifeq ($(MAKECMDGOALS),modules)
211 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
214 # If we have "make <whatever> modules", compile modules
215 # in addition to whatever we do anyway.
216 # Just "make" or "make all" shall build modules as well
218 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
222 ifeq ($(MAKECMDGOALS),)
226 export KBUILD_MODULES KBUILD_BUILTIN
227 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
230 # ---------------------------------------------------------------------------
232 # Normally, we echo the whole command before executing it. By making
233 # that echo $($(quiet)$(cmd)), we now have the possibility to set
234 # $(quiet) to choose other forms of output instead, e.g.
236 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
237 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
239 # If $(quiet) is empty, the whole command will be printed.
240 # If it is set to "quiet_", only the short version will be printed.
241 # If it is set to "silent_", nothing wil be printed at all, since
242 # the variable $(silent_cmd_cc_o_c) doesn't exist.
244 # A simple variant is to prefix commands with $(Q) - that's useful
245 # for commands that shall be hidden in non-verbose mode.
249 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
250 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
252 ifeq ($(KBUILD_VERBOSE),1)
260 # If the user is running make -s (silent mode), suppress echoing of
263 ifneq ($(findstring s,$(MAKEFLAGS)),)
267 export quiet Q KBUILD_VERBOSE
270 # Look for make include files relative to root of kernel src
271 MAKEFLAGS += --include-dir=$(srctree)
277 # We need some generic definitions
278 include $(srctree)/scripts/Kbuild.include
280 HOSTCFLAGS += $(call hostcc-option,-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer,)
283 # For maximum performance (+ possibly random breakage, uncomment
288 # Make variables (CC, etc...)
290 AS = $(CROSS_COMPILE)as
291 CC = $(CROSS_COMPILE)gcc
294 AR = $(CROSS_COMPILE)ar
295 NM = $(CROSS_COMPILE)nm
296 STRIP = $(CROSS_COMPILE)strip
297 OBJCOPY = $(CROSS_COMPILE)objcopy
298 OBJDUMP = $(CROSS_COMPILE)objdump
300 GENKSYMS = scripts/genksyms/genksyms
301 DEPMOD = /sbin/depmod
302 KALLSYMS = scripts/kallsyms
306 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
308 CFLAGS_MODULE = $(MODFLAGS)
309 AFLAGS_MODULE = $(MODFLAGS)
315 # Use LINUXINCLUDE when you must reference the include/ directory.
316 # Needed to be compatible with the O= option
318 # Added only to final link stage of busybox binary
319 CFLAGS_busybox := $(CFLAGS_busybox)
320 CPPFLAGS := $(CPPFLAGS)
322 LDFLAGS := $(LDFLAGS)
325 # Read KERNELRELEASE from .kernelrelease (if it exists)
326 KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
327 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
329 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
330 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
331 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
332 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
334 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
335 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
336 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
339 # When compiling out-of-tree modules, put MODVERDIR in the module
340 # tree rather than in the kernel tree. The kernel tree might
342 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
344 # Files to ignore in find ... statements
346 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
347 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
349 # ===========================================================================
350 # Rules shared between *config targets and build targets
352 # Basic helpers built in scripts/
353 PHONY += scripts_basic
355 $(Q)$(MAKE) $(build)=scripts/basic
357 # To avoid any implicit rule to kick in, define an empty command.
358 scripts/basic/%: scripts_basic ;
360 PHONY += outputmakefile
361 # outputmakefile generates a Makefile in the output directory, if using a
362 # separate output directory. This allows convenient use of make in the
365 ifneq ($(KBUILD_SRC),)
366 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
367 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
370 # To make sure we do not include .config for any of the *config targets
371 # catch them early, and hand them over to scripts/kconfig/Makefile
372 # It is allowed to specify more targets when calling make, including
373 # mixing *config targets and build targets.
374 # For example 'make oldconfig all'.
375 # Detect when mixed targets is specified, and make a second invocation
376 # of make so .config is not included in this case either (for *config).
378 no-dot-config-targets := clean mrproper distclean \
379 cscope TAGS tags help %docs
380 #bbox# check% is removed from above
386 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
387 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
392 ifeq ($(KBUILD_EXTMOD),)
393 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
395 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
401 ifeq ($(mixed-targets),1)
402 # ===========================================================================
403 # We're called with mixed targets (*config and build targets).
404 # Handle them one by one.
407 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
410 ifeq ($(config-targets),1)
411 # ===========================================================================
412 # *config targets only - make sure prerequisites are updated, and descend
413 # in scripts/kconfig to make the *config target
415 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
416 # KBUILD_DEFCONFIG may point out an alternative default configuration
417 # used for 'make defconfig'
418 -include $(srctree)/arch/$(ARCH)/Makefile
419 export KBUILD_DEFCONFIG
421 config %config: scripts_basic outputmakefile FORCE
423 $(Q)$(MAKE) $(build)=scripts/kconfig $@
424 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
427 # ===========================================================================
428 # Build targets only - this includes busybox, arch specific targets, clean
429 # targets and others. In general all targets except *config targets.
431 ifeq ($(KBUILD_EXTMOD),)
432 # Additional helpers built in scripts/
433 # Carefully list dependencies so we do not try to build scripts twice
436 scripts: scripts_basic include/config/MARKER
437 $(Q)$(MAKE) $(build)=$(@)
439 scripts_basic: include/autoconf.h
441 # Objects we will link into busybox / subdirs we need to visit
447 archival/libunarchive/ \
450 coreutils/libcoreutils/ \
463 networking/libiproute/ \
472 util-linux/volume_id/ \
474 endif # KBUILD_EXTMOD
476 ifeq ($(dot-config),1)
477 # In this section, we need .config
479 # Read in dependencies to all Kconfig* files, make sure to run
480 # oldconfig if changes are detected.
485 # If .config needs to be updated, it will be done via the dependency
486 # that autoconf has on .config.
487 # To avoid any implicit rule to kick in, define an empty command
488 .config .kconfig.d: ;
490 # Now we can define CFLAGS etc according to .config
491 include $(srctree)/Makefile.flags
493 # If .config is newer than include/autoconf.h, someone tinkered
494 # with it and forgot to run make oldconfig.
495 # If kconfig.d is missing then we are probarly in a cleaned tree so
496 # we execute the config step to be sure to catch updated Kconfig files
497 include/autoconf.h: .kconfig.d .config
498 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
501 # Dummy target needed, because used as prerequisite
502 include/autoconf.h: ;
505 # The all: target is the default when no target is given on the
507 # This allow a user to issue only 'make' to build a kernel including modules
508 # Defaults busybox but it is usually overridden in the arch makefile
511 -include $(srctree)/arch/$(ARCH)/Makefile
513 # arch Makefile may override CC so keep this after arch Makefile is included
514 #bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
515 CHECKFLAGS += $(NOSTDINC_FLAGS)
517 # Default kernel image to build when no specific target is given.
518 # KBUILD_IMAGE may be overruled on the commandline or
519 # set in the environment
520 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
522 export KBUILD_IMAGE ?= busybox
525 # INSTALL_PATH specifies where to place the updated kernel and system map
526 # images. Default is /boot, but you can set it to other values
527 export INSTALL_PATH ?= /boot
530 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
531 # relocations required by build roots. This is not defined in the
532 # makefile but the arguement can be passed to make if needed.
535 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
539 ifeq ($(KBUILD_EXTMOD),)
540 busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
542 busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
543 $(core-n) $(core-) $(libs-n) $(libs-) \
546 core-y := $(patsubst %/, %/built-in.o, $(core-y))
547 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
548 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
549 libs-y := $(libs-y1) $(libs-y2)
552 # ---------------------------------------------------------------------------
553 # busybox is build from the objects selected by $(busybox-init) and
554 # $(busybox-main). Most are built-in.o files from top-level directories
555 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
556 # Ordering when linking is important, and $(busybox-init) must be first.
561 # +-< $(busybox-init)
562 # | +--< init/version.o + more
564 # +--< $(busybox-main)
565 # | +--< driver/built-in.o mm/built-in.o + more
567 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
569 # busybox version (uname -v) cannot be updated during normal
570 # descending-into-subdirs phase since we do not yet know if we need to
572 # Therefore this step is delayed until just before final link of busybox -
573 # except in the kallsyms case where it is done just before adding the
574 # symbols to the kernel.
576 # System.map is generated to document addresses of all kernel symbols
578 busybox-all := $(core-y) $(libs-y)
580 # Rule to link busybox - also used during CONFIG_KALLSYMS
581 # May be overridden by arch/$(ARCH)/Makefile
582 quiet_cmd_busybox__ ?= LINK $@
583 cmd_busybox__ ?= $(srctree)/scripts/trylink \
586 "$(CFLAGS) $(CFLAGS_busybox)" \
587 "$(LDFLAGS) $(EXTRA_LDFLAGS)" \
592 # Generate System.map
593 quiet_cmd_sysmap = SYSMAP
594 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
597 # If CONFIG_KALLSYMS is set .version is already updated
598 # Generate System.map and verify that the content is consistent
599 # Use + in front of the busybox_version rule to silent warning with make -j2
600 # First command is ':' to allow us to use + in front of the rule
601 define rule_busybox__
603 $(call cmd,busybox__)
604 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
608 ifdef CONFIG_KALLSYMS
609 # Generate section listing all symbols and add it into busybox $(kallsyms.o)
610 # It's a three stage process:
611 # o .tmp_busybox1 has all symbols and sections, but __kallsyms is
613 # Running kallsyms on that gives us .tmp_kallsyms1.o with
614 # the right size - busybox version (uname -v) is updated during this step
615 # o .tmp_busybox2 now has a __kallsyms section of the right size,
616 # but due to the added section, some addresses have shifted.
617 # From here, we generate a correct .tmp_kallsyms2.o
618 # o The correct .tmp_kallsyms2.o is linked into the final busybox.
619 # o Verify that the System.map from busybox matches the map from
620 # .tmp_busybox2, just in case we did not generate kallsyms correctly.
621 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
622 # .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a
623 # temporary bypass to allow the kernel to be built while the
624 # maintainers work out what went wrong with kallsyms.
626 ifdef CONFIG_KALLSYMS_EXTRA_PASS
632 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
634 define verify_kallsyms
635 $(Q)$(if $($(quiet)cmd_sysmap), \
636 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
637 $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
638 $(Q)cmp -s System.map .tmp_System.map || \
639 (echo Inconsistent kallsyms data; \
640 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
641 rm .tmp_kallsyms* ; /bin/false )
644 # Update busybox version before link
645 # Use + in front of this rule to silent warning about make -j1
646 # First command is ':' to allow us to use + in front of this rule
647 cmd_ksym_ld = $(cmd_busybox__)
650 +$(call cmd,busybox_version)
651 $(call cmd,busybox__)
652 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
655 # Generate .S file with all kernel symbols
656 quiet_cmd_kallsyms = KSYM $@
657 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
658 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
660 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
661 $(call if_changed_dep,as_o_S)
663 .tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
666 # .tmp_busybox1 must be complete except kallsyms, so update busybox version
667 .tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
668 $(call if_changed_rule,ksym_ld)
670 .tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
671 $(call if_changed,busybox__)
673 .tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
674 $(call if_changed,busybox__)
676 # Needs to visit scripts/ before $(KALLSYMS) can be used.
677 $(KALLSYMS): scripts ;
679 # Generate some data for debugging strange kallsyms problems
680 debug_kallsyms: .tmp_map$(last_kallsyms)
682 .tmp_map%: .tmp_busybox% FORCE
683 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
689 endif # ifdef CONFIG_KALLSYMS
691 # busybox image - including updated kernel symbols
692 busybox_unstripped: $(busybox-all) FORCE
693 $(call if_changed_rule,busybox__)
694 $(Q)rm -f .old_version
696 busybox: busybox_unstripped
697 ifeq ($(SKIP_STRIP),y)
700 $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \
701 busybox_unstripped -o $@
702 # strip is confused by PIE executable and does not set exec bits
706 # The actual objects are generated when descending,
707 # make sure no implicit rule kicks in
708 $(sort $(busybox-all)): $(busybox-dirs) ;
710 # Handle descending into subdirectories listed in $(busybox-dirs)
711 # Preset locale variables to speed up the build process. Limit locale
712 # tweaks to this spot to avoid wrong language settings when running
713 # make menuconfig etc.
714 # Error messages still appears in the original language
716 PHONY += $(busybox-dirs)
717 $(busybox-dirs): prepare scripts
718 $(Q)$(MAKE) $(build)=$@
720 # Build the kernel release string
721 # The KERNELRELEASE is stored in a file named .kernelrelease
722 # to be used when executing for example make install or make modules_install
724 # Take the contents of any files called localversion* and the config
725 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
726 # LOCALVERSION from the command line override all of this
729 space := $(nullstring) # end of line
731 ___localver = $(objtree)/localversion* $(srctree)/localversion*
732 __localver = $(sort $(wildcard $(___localver)))
733 # skip backup files (containing '~')
734 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
736 localver = $(subst $(space),, \
737 $(shell cat /dev/null $(_localver)) \
738 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
740 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
741 # and if the SCM is know a tag from the SCM is appended.
742 # The appended tag is determinded by the SCM used.
744 # Currently, only git is supported.
745 # Other SCMs can edit scripts/setlocalversion and add the appropriate
747 ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO
748 _localver-auto = $(shell $(CONFIG_SHELL) \
749 $(srctree)/scripts/setlocalversion $(srctree))
750 localver-auto = $(LOCALVERSION)$(_localver-auto)
753 localver-full = $(localver)$(localver-auto)
755 # Store (new) KERNELRELASE string in .kernelrelease
756 kernelrelease = $(KERNELVERSION)$(localver-full)
757 .kernelrelease: FORCE
759 $(Q)echo $(kernelrelease) > $@
762 # Things we need to do before we recursively start building the kernel
763 # or the modules are listed in "prepare".
764 # A multi level approach is used. prepareN is processed before prepareN-1.
765 # archprepare is used in arch Makefiles and when processed asm symlink,
766 # version.h and scripts_basic is processed / created.
768 # Listed in dependency order
769 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
771 # prepare-all is deprecated, use prepare as valid replacement
774 # prepare3 is used to check if we are building in a separate output directory,
776 # 1) Check that make has not been executed in the kernel src $(srctree)
777 # 2) Create the include2 directory, used for the second asm symlink
778 prepare3: .kernelrelease
779 ifneq ($(KBUILD_SRC),)
780 @echo ' Using $(srctree) as source for busybox'
781 $(Q)if [ -f $(srctree)/.config ]; then \
782 echo " $(srctree) is not clean, please run 'make mrproper'";\
783 echo " in the '$(srctree)' directory.";\
786 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
787 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
790 # prepare2 creates a makefile if using a separate output directory
791 prepare2: prepare3 outputmakefile
793 prepare1: prepare2 include/config/MARKER
794 ifneq ($(KBUILD_MODULES),)
795 $(Q)mkdir -p $(MODVERDIR)
796 $(Q)rm -f $(MODVERDIR)/*
799 archprepare: prepare1 scripts_basic
801 prepare0: archprepare FORCE
802 $(Q)$(MAKE) $(build)=.
804 # All the preparing..
805 prepare prepare-all: prepare0
807 # Leave this as default for preprocessing busybox.lds.S, which is now
808 # done in arch/$(ARCH)/kernel/Makefile
810 export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
812 # FIXME: The asm symlink changes when $(ARCH) changes. That's
813 # hard to detect, but I suppose "make mrproper" is a good idea
814 # before switching between archs anyway.
817 #bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
818 #bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi;
819 #bbox# @ln -fsn asm-$(ARCH) $@
821 # Split autoconf.h into include/linux/config/*
822 quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h
823 cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs > include/bbconfigopts.h
824 quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/*
825 cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config
826 #bbox# piggybacked generation of few .h files
827 include/config/MARKER: scripts/basic/split-include include/autoconf.h
828 $(call cmd,split_autoconf)
829 $(call cmd,gen_bbconfigopts)
832 # Generate some files
833 # ---------------------------------------------------------------------------
835 # KERNELRELEASE can change from a few different places, meaning version.h
836 # needs to be updated, so this check is forced on all builds
840 define filechk_version.h
841 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
842 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
845 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
846 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
847 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
851 # ---------------------------------------------------------------------------
855 @echo '*** Warning: make $@ is unnecessary now.'
857 # ---------------------------------------------------------------------------
860 ifdef _BB_DISABLED_CONFIG_MODULES
862 # By default, build modules as well
869 modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
870 @echo ' Building modules, stage 2.';
871 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
874 # Target to prepare building external modules
875 PHONY += modules_prepare
876 modules_prepare: prepare scripts
878 # Target to install modules
879 PHONY += modules_install
880 modules_install: _modinst_ _modinst_post
884 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
885 echo "Warning: you may need to install module-init-tools"; \
886 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
889 @rm -rf $(MODLIB)/kernel
890 @rm -f $(MODLIB)/source
891 @mkdir -p $(MODLIB)/kernel
892 @ln -s $(srctree) $(MODLIB)/source
893 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
894 rm -f $(MODLIB)/build ; \
895 ln -s $(objtree) $(MODLIB)/build ; \
897 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
899 # If System.map exists, run depmod. This deliberately does not have a
900 # dependency on System.map since that would run the dependency tree on
901 # busybox. This depmod is only for convenience to give the initial
902 # boot a modules.dep even before / is mounted read-write. However the
903 # boot script depmod is the master version.
904 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
907 depmod_opts := -b $(INSTALL_MOD_PATH) -r
909 PHONY += _modinst_post
910 _modinst_post: _modinst_
911 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
913 else # CONFIG_MODULES
915 # Modules not configured
916 # ---------------------------------------------------------------------------
918 modules modules_install: FORCE
920 @echo "The present busybox configuration has modules disabled."
921 @echo "Type 'make config' and enable loadable module support."
922 @echo "Then build a kernel with module support enabled."
926 endif # CONFIG_MODULES
929 # Cleaning is done on three levels.
930 # make clean Delete most generated files
931 # Leave enough to build external modules
932 # make mrproper Delete the current configuration, and all generated files
933 # make distclean Remove editor backup files, patch leftover files and the like
935 # Directories & files removed with 'make clean'
936 CLEAN_DIRS += $(MODVERDIR) _install 0_lib
937 CLEAN_FILES += busybox busybox_unstripped* busybox.links \
938 System.map .kernelrelease \
939 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
941 # Directories & files removed with 'make mrproper'
942 MRPROPER_DIRS += include/config include2
943 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
945 include/bbconfigopts.h \
946 include/usage_compressed.h \
947 include/applet_tables.h \
949 .kernelrelease Module.symvers tags TAGS cscope* \
952 # clean - Delete most, but leave enough to build external modules
954 clean: rm-dirs := $(CLEAN_DIRS)
955 clean: rm-files := $(CLEAN_FILES)
956 clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
958 PHONY += $(clean-dirs) clean archclean
960 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
962 clean: archclean $(clean-dirs)
965 @find . $(RCS_FIND_IGNORE) \
966 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
967 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
968 -type f -print | xargs rm -f
971 doc-clean: rm-files := docs/busybox.pod \
972 docs/BusyBox.html docs/BusyBox.1 docs/BusyBox.txt
976 # mrproper - Delete all generated files, including .config
978 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
979 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
980 mrproper-dirs := $(addprefix _mrproper_,scripts)
982 PHONY += $(mrproper-dirs) mrproper archmrproper
984 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
986 mrproper: clean archmrproper $(mrproper-dirs)
995 @find $(srctree) $(RCS_FIND_IGNORE) \
996 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
997 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
998 -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \
999 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1000 -type f -print | xargs rm -f
1003 # Packaging of the kernel to various formats
1004 # ---------------------------------------------------------------------------
1005 # rpm target kept for backward compatibility
1006 package-dir := $(srctree)/scripts/package
1009 $(Q)$(MAKE) $(build)=$(package-dir) $@
1011 $(Q)$(MAKE) $(build)=$(package-dir) $@
1014 # Brief documentation of the typical targets used
1015 # ---------------------------------------------------------------------------
1017 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1018 boards := $(notdir $(boards))
1020 -include $(srctree)/Makefile.help
1022 # Documentation targets
1023 # ---------------------------------------------------------------------------
1024 %docs: scripts_basic FORCE
1025 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1027 else # KBUILD_EXTMOD
1030 # External module support.
1031 # When building external modules the kernel used as basis is considered
1032 # read-only, and no consistency checks are made and the make
1033 # system is not used on the basis kernel. If updates are required
1034 # in the basis kernel ordinary make commands (without M=...) must
1037 # The following are the only valid targets when building external
1039 # make M=dir clean Delete all automatically generated files
1040 # make M=dir modules Make all modules in specified dir
1041 # make M=dir Same as 'make M=dir modules'
1042 # make M=dir modules_install
1043 # Install the modules build in the module directory
1044 # Assumes install directory is already created
1046 # We are always building modules
1048 PHONY += crmodverdir
1050 $(Q)mkdir -p $(MODVERDIR)
1051 $(Q)rm -f $(MODVERDIR)/*
1053 PHONY += $(objtree)/Module.symvers
1054 $(objtree)/Module.symvers:
1055 @test -e $(objtree)/Module.symvers || ( \
1057 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1058 echo " is missing; modules will have no dependencies and modversions."; \
1061 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1062 PHONY += $(module-dirs) modules
1063 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1064 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1066 modules: $(module-dirs)
1067 @echo ' Building modules, stage 2.';
1068 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1070 PHONY += modules_install
1071 modules_install: _emodinst_ _emodinst_post
1073 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1076 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1077 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1079 # Run depmod only is we have System.map and depmod is executable
1080 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1081 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1082 $(DEPMOD) -ae -F System.map \
1083 $(if $(strip $(INSTALL_MOD_PATH)), \
1084 -b $(INSTALL_MOD_PATH) -r) \
1088 PHONY += _emodinst_post
1089 _emodinst_post: _emodinst_
1092 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1094 PHONY += $(clean-dirs) clean
1096 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1098 clean: rm-dirs := $(MODVERDIR)
1099 clean: $(clean-dirs)
1101 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1102 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1103 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1104 -type f -print | xargs rm -f
1107 @echo ' Building external modules.'
1108 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1110 @echo ' modules - default target, build the module(s)'
1111 @echo ' modules_install - install the module'
1112 @echo ' clean - remove generated files in module directory only'
1116 PHONY += prepare scripts
1119 endif # KBUILD_EXTMOD
1121 # Generate tags for editors
1122 # ---------------------------------------------------------------------------
1124 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1125 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1126 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1128 ifeq ($(src),$(obj))
1131 __srctree = $(srctree)/
1134 ifeq ($(ALLSOURCE_ARCHS),)
1136 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1138 ALLINCLUDE_ARCHS := $(ARCH)
1141 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1142 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1145 ALLSOURCE_ARCHS := $(ARCH)
1148 ( find $(__srctree) $(RCS_FIND_IGNORE) \
1149 \( -name include -o -name arch \) -prune -o \
1150 -name '*.[chS]' -print; \
1151 for ARCH in $(ALLSOURCE_ARCHS) ; do \
1152 find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1153 -name '*.[chS]' -print; \
1155 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1156 -name '*.[chS]' -print; \
1157 find $(__srctree)include $(RCS_FIND_IGNORE) \
1158 \( -name config -o -name 'asm-*' \) -prune \
1159 -o -name '*.[chS]' -print; \
1160 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1161 find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1162 -name '*.[chS]' -print; \
1164 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1165 -name '*.[chS]' -print )
1168 quiet_cmd_cscope-file = FILELST cscope.files
1169 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1171 quiet_cmd_cscope = MAKE cscope.out
1172 cmd_cscope = cscope -b
1175 $(call cmd,cscope-file)
1178 quiet_cmd_TAGS = MAKE $@
1181 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
1182 echo "-I __initdata,__exitdata,__acquires,__releases \
1183 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1184 --extra=+f --c-kinds=+px"`; \
1185 $(all-sources) | xargs etags $$ETAGSF -a
1192 quiet_cmd_tags = MAKE $@
1195 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
1196 echo "-I __initdata,__exitdata,__acquires,__releases \
1197 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1198 --extra=+f --c-kinds=+px"`; \
1199 $(all-sources) | xargs ctags $$CTAGSF -a
1206 # Scripts to check various things for consistency
1207 # ---------------------------------------------------------------------------
1210 find * $(RCS_FIND_IGNORE) \
1211 -name '*.[hcS]' -type f -print | sort \
1212 | xargs $(PERL) -w scripts/checkincludes.pl
1215 find * $(RCS_FIND_IGNORE) \
1216 -name '*.[hcS]' -type f -print | sort \
1217 | xargs $(PERL) -w scripts/checkversion.pl
1220 $(PERL) $(srctree)/scripts/namespace.pl
1222 endif #ifeq ($(config-targets),1)
1223 endif #ifeq ($(mixed-targets),1)
1227 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
1228 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1231 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1232 $(error kernelrelease not valid - run 'make *config' to update it))
1234 @echo $(KERNELVERSION)
1237 # ---------------------------------------------------------------------------
1238 # Single targets are compatible with:
1239 # - build whith mixed source and output
1240 # - build with separate output dir 'make O=...'
1241 # - external modules
1243 # target-dir => where to store outputfile
1244 # build-dir => directory in kernel source tree to use
1246 ifeq ($(KBUILD_EXTMOD),)
1247 build-dir = $(patsubst %/,%,$(dir $@))
1248 target-dir = $(dir $@)
1250 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1251 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1252 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1255 %.s: %.c prepare scripts FORCE
1256 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1257 %.i: %.c prepare scripts FORCE
1258 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1259 %.o: %.c prepare scripts FORCE
1260 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1261 %.lst: %.c prepare scripts FORCE
1262 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1263 %.s: %.S prepare scripts FORCE
1264 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1265 %.o: %.S prepare scripts FORCE
1266 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1269 / %/: prepare scripts FORCE
1270 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1271 $(build)=$(build-dir)
1272 %.ko: prepare scripts FORCE
1273 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1274 $(build)=$(build-dir) $(@:.ko=.o)
1275 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1277 # FIXME Should go into a make.lib or something
1278 # ===========================================================================
1280 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1281 cmd_rmdirs = rm -rf $(rm-dirs)
1283 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1284 cmd_rmfiles = rm -f $(rm-files)
1287 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1288 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1289 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1291 quiet_cmd_as_o_S = AS $@
1292 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1294 # read all saved command lines
1296 targets := $(wildcard $(sort $(targets)))
1297 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1299 ifneq ($(cmd_files),)
1300 $(cmd_files): ; # Do not try to update included dependency files
1301 include $(cmd_files)
1304 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1306 # $(Q)$(MAKE) $(clean)=dir
1307 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1309 endif # skip-makefile
1314 -include $(srctree)/Makefile.custom
1316 # Declare the contents of the .PHONY variable as phony. We keep that
1317 # information in a variable se we can use it in if_changed and friends.