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) $(PATCHLEVEL)
355 # To make sure we do not include .config for any of the *config targets
356 # catch them early, and hand them over to scripts/kconfig/Makefile
357 # It is allowed to specify more targets when calling make, including
358 # mixing *config targets and build targets.
359 # For example 'make oldconfig all'.
360 # Detect when mixed targets is specified, and make a second invocation
361 # of make so .config is not included in this case either (for *config).
363 no-dot-config-targets := clean mrproper distclean \
364 cscope TAGS tags help %docs check%
370 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
371 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
376 ifeq ($(KBUILD_EXTMOD),)
377 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
379 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
385 ifeq ($(mixed-targets),1)
386 # ===========================================================================
387 # We're called with mixed targets (*config and build targets).
388 # Handle them one by one.
391 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
394 ifeq ($(config-targets),1)
395 # ===========================================================================
396 # *config targets only - make sure prerequisites are updated, and descend
397 # in scripts/kconfig to make the *config target
399 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
400 # KBUILD_DEFCONFIG may point out an alternative default configuration
401 # used for 'make defconfig'
402 -include $(srctree)/arch/$(ARCH)/Makefile
403 export KBUILD_DEFCONFIG
405 config %config: scripts_basic outputmakefile FORCE
407 $(Q)$(MAKE) $(build)=scripts/kconfig $@
408 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
411 # ===========================================================================
412 # Build targets only - this includes busybox, arch specific targets, clean
413 # targets and others. In general all targets except *config targets.
415 ifeq ($(KBUILD_EXTMOD),)
416 # Additional helpers built in scripts/
417 # Carefully list dependencies so we do not try to build scripts twice
420 scripts: scripts_basic include/config/MARKER
421 $(Q)$(MAKE) $(build)=$(@)
423 scripts_basic: include/autoconf.h
425 # Objects we will link into busybox / subdirs we need to visit
431 archival/libunarchive/ \
434 coreutils/libcoreutils/ \
447 networking/libiproute/ \
456 endif # KBUILD_EXTMOD
458 ifeq ($(dot-config),1)
459 # In this section, we need .config
461 # Read in dependencies to all Kconfig* files, make sure to run
462 # oldconfig if changes are detected.
467 # If .config needs to be updated, it will be done via the dependency
468 # that autoconf has on .config.
469 # To avoid any implicit rule to kick in, define an empty command
470 .config .kconfig.d: ;
472 # Now we can define CFLAGS etc according to .config
473 include $(srctree)/Makefile.flags
475 # If .config is newer than include/autoconf.h, someone tinkered
476 # with it and forgot to run make oldconfig.
477 # If kconfig.d is missing then we are probarly in a cleaned tree so
478 # we execute the config step to be sure to catch updated Kconfig files
479 include/autoconf.h: .kconfig.d .config
480 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
483 # Dummy target needed, because used as prerequisite
484 include/autoconf.h: ;
487 # The all: target is the default when no target is given on the
489 # This allow a user to issue only 'make' to build a kernel including modules
490 # Defaults busybox but it is usually overridden in the arch makefile
493 -include $(srctree)/arch/$(ARCH)/Makefile
495 # arch Makefile may override CC so keep this after arch Makefile is included
496 #bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
497 CHECKFLAGS += $(NOSTDINC_FLAGS)
499 # warn about C99 declaration after statement
500 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
502 # disable pointer signedness warnings in gcc 4.0
503 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
505 # Default kernel image to build when no specific target is given.
506 # KBUILD_IMAGE may be overruled on the commandline or
507 # set in the environment
508 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
510 export KBUILD_IMAGE ?= busybox
513 # INSTALL_PATH specifies where to place the updated kernel and system map
514 # images. Default is /boot, but you can set it to other values
515 export INSTALL_PATH ?= /boot
518 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
519 # relocations required by build roots. This is not defined in the
520 # makefile but the arguement can be passed to make if needed.
523 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
527 ifeq ($(KBUILD_EXTMOD),)
528 busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
530 busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
531 $(core-n) $(core-) $(libs-n) $(libs-) \
534 core-y := $(patsubst %/, %/built-in.o, $(core-y))
535 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
536 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
537 libs-y := $(libs-y1) $(libs-y2)
540 # ---------------------------------------------------------------------------
541 # busybox is build from the objects selected by $(busybox-init) and
542 # $(busybox-main). Most are built-in.o files from top-level directories
543 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
544 # Ordering when linking is important, and $(busybox-init) must be first.
549 # +-< $(busybox-init)
550 # | +--< init/version.o + more
552 # +--< $(busybox-main)
553 # | +--< driver/built-in.o mm/built-in.o + more
555 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
557 # busybox version (uname -v) cannot be updated during normal
558 # descending-into-subdirs phase since we do not yet know if we need to
560 # Therefore this step is delayed until just before final link of busybox -
561 # except in the kallsyms case where it is done just before adding the
562 # symbols to the kernel.
564 # System.map is generated to document addresses of all kernel symbols
566 busybox-all := $(core-y) $(libs-y)
568 # Rule to link busybox - also used during CONFIG_KALLSYMS
569 # May be overridden by arch/$(ARCH)/Makefile
570 quiet_cmd_busybox__ ?= LINK $@
571 cmd_busybox__ ?= $(srctree)/scripts/trylink $(CC) $(LDFLAGS) $(EXTRA_LDFLAGS) \
572 -o $@ -Wl,-Map -Wl,$@.map \
573 -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
574 -Wl,--start-group $(busybox-all) -Wl,--end-group \
577 # Generate System.map
578 quiet_cmd_sysmap = SYSMAP
579 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
582 # If CONFIG_KALLSYMS is set .version is already updated
583 # Generate System.map and verify that the content is consistent
584 # Use + in front of the busybox_version rule to silent warning with make -j2
585 # First command is ':' to allow us to use + in front of the rule
586 define rule_busybox__
588 $(call cmd,busybox__)
589 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
593 ifdef CONFIG_KALLSYMS
594 # Generate section listing all symbols and add it into busybox $(kallsyms.o)
595 # It's a three stage process:
596 # o .tmp_busybox1 has all symbols and sections, but __kallsyms is
598 # Running kallsyms on that gives us .tmp_kallsyms1.o with
599 # the right size - busybox version (uname -v) is updated during this step
600 # o .tmp_busybox2 now has a __kallsyms section of the right size,
601 # but due to the added section, some addresses have shifted.
602 # From here, we generate a correct .tmp_kallsyms2.o
603 # o The correct .tmp_kallsyms2.o is linked into the final busybox.
604 # o Verify that the System.map from busybox matches the map from
605 # .tmp_busybox2, just in case we did not generate kallsyms correctly.
606 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
607 # .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a
608 # temporary bypass to allow the kernel to be built while the
609 # maintainers work out what went wrong with kallsyms.
611 ifdef CONFIG_KALLSYMS_EXTRA_PASS
617 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
619 define verify_kallsyms
620 $(Q)$(if $($(quiet)cmd_sysmap), \
621 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
622 $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
623 $(Q)cmp -s System.map .tmp_System.map || \
624 (echo Inconsistent kallsyms data; \
625 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
626 rm .tmp_kallsyms* ; /bin/false )
629 # Update busybox version before link
630 # Use + in front of this rule to silent warning about make -j1
631 # First command is ':' to allow us to use + in front of this rule
632 cmd_ksym_ld = $(cmd_busybox__)
635 +$(call cmd,busybox_version)
636 $(call cmd,busybox__)
637 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
640 # Generate .S file with all kernel symbols
641 quiet_cmd_kallsyms = KSYM $@
642 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
643 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
645 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
646 $(call if_changed_dep,as_o_S)
648 .tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
651 # .tmp_busybox1 must be complete except kallsyms, so update busybox version
652 .tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
653 $(call if_changed_rule,ksym_ld)
655 .tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
656 $(call if_changed,busybox__)
658 .tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
659 $(call if_changed,busybox__)
661 # Needs to visit scripts/ before $(KALLSYMS) can be used.
662 $(KALLSYMS): scripts ;
664 # Generate some data for debugging strange kallsyms problems
665 debug_kallsyms: .tmp_map$(last_kallsyms)
667 .tmp_map%: .tmp_busybox% FORCE
668 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
674 endif # ifdef CONFIG_KALLSYMS
676 # busybox image - including updated kernel symbols
677 busybox_unstripped: $(busybox-all) FORCE
678 $(call if_changed_rule,busybox__)
679 $(Q)rm -f .old_version
681 busybox: busybox_unstripped
682 ifeq ($(SKIP_STRIP),y)
685 $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \
686 busybox_unstripped -o $@
689 # The actual objects are generated when descending,
690 # make sure no implicit rule kicks in
691 $(sort $(busybox-all)): $(busybox-dirs) ;
693 # Handle descending into subdirectories listed in $(busybox-dirs)
694 # Preset locale variables to speed up the build process. Limit locale
695 # tweaks to this spot to avoid wrong language settings when running
696 # make menuconfig etc.
697 # Error messages still appears in the original language
699 PHONY += $(busybox-dirs)
700 $(busybox-dirs): prepare scripts
701 $(Q)$(MAKE) $(build)=$@
703 # Build the kernel release string
704 # The KERNELRELEASE is stored in a file named .kernelrelease
705 # to be used when executing for example make install or make modules_install
707 # Take the contents of any files called localversion* and the config
708 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
709 # LOCALVERSION from the command line override all of this
712 space := $(nullstring) # end of line
714 ___localver = $(objtree)/localversion* $(srctree)/localversion*
715 __localver = $(sort $(wildcard $(___localver)))
716 # skip backup files (containing '~')
717 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
719 localver = $(subst $(space),, \
720 $(shell cat /dev/null $(_localver)) \
721 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
723 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
724 # and if the SCM is know a tag from the SCM is appended.
725 # The appended tag is determinded by the SCM used.
727 # Currently, only git is supported.
728 # Other SCMs can edit scripts/setlocalversion and add the appropriate
730 ifdef CONFIG_LOCALVERSION_AUTO
731 _localver-auto = $(shell $(CONFIG_SHELL) \
732 $(srctree)/scripts/setlocalversion $(srctree))
733 localver-auto = $(LOCALVERSION)$(_localver-auto)
736 localver-full = $(localver)$(localver-auto)
738 # Store (new) KERNELRELASE string in .kernelrelease
739 kernelrelease = $(KERNELVERSION)$(localver-full)
740 .kernelrelease: FORCE
742 $(Q)echo $(kernelrelease) > $@
745 # Things we need to do before we recursively start building the kernel
746 # or the modules are listed in "prepare".
747 # A multi level approach is used. prepareN is processed before prepareN-1.
748 # archprepare is used in arch Makefiles and when processed asm symlink,
749 # version.h and scripts_basic is processed / created.
751 # Listed in dependency order
752 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
754 # prepare-all is deprecated, use prepare as valid replacement
757 # prepare3 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 $(srctree)
760 # 2) Create the include2 directory, used for the second asm symlink
761 prepare3: .kernelrelease
762 ifneq ($(KBUILD_SRC),)
763 @echo ' Using $(srctree) as source for busybox'
764 $(Q)if [ -f $(srctree)/.config ]; then \
765 echo " $(srctree) is not clean, please run 'make mrproper'";\
766 echo " in the '$(srctree)' directory.";\
769 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
770 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
773 # prepare2 creates a makefile if using a separate output directory
774 prepare2: prepare3 outputmakefile
776 prepare1: prepare2 include/config/MARKER
777 ifneq ($(KBUILD_MODULES),)
778 $(Q)mkdir -p $(MODVERDIR)
779 $(Q)rm -f $(MODVERDIR)/*
782 archprepare: prepare1 scripts_basic
784 prepare0: archprepare FORCE
785 $(Q)$(MAKE) $(build)=.
787 # All the preparing..
788 prepare prepare-all: prepare0
790 # Leave this as default for preprocessing busybox.lds.S, which is now
791 # done in arch/$(ARCH)/kernel/Makefile
793 export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
795 # FIXME: The asm symlink changes when $(ARCH) changes. That's
796 # hard to detect, but I suppose "make mrproper" is a good idea
797 # before switching between archs anyway.
800 #bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
801 #bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi;
802 #bbox# @ln -fsn asm-$(ARCH) $@
804 # Split autoconf.h into include/linux/config/*
805 quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h
806 cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs > include/bbconfigopts.h
807 quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/*
808 cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config
809 #bbox# piggybacked generation of few .h files
810 include/config/MARKER: scripts/basic/split-include include/autoconf.h
811 $(call cmd,split_autoconf)
812 $(call cmd,gen_bbconfigopts)
815 # Generate some files
816 # ---------------------------------------------------------------------------
818 # KERNELRELEASE can change from a few different places, meaning version.h
819 # needs to be updated, so this check is forced on all builds
823 define filechk_version.h
824 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
825 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
828 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
829 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
830 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
834 # ---------------------------------------------------------------------------
838 @echo '*** Warning: make $@ is unnecessary now.'
840 # ---------------------------------------------------------------------------
845 # By default, build modules as well
852 modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
853 @echo ' Building modules, stage 2.';
854 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
857 # Target to prepare building external modules
858 PHONY += modules_prepare
859 modules_prepare: prepare scripts
861 # Target to install modules
862 PHONY += modules_install
863 modules_install: _modinst_ _modinst_post
867 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
868 echo "Warning: you may need to install module-init-tools"; \
869 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
872 @rm -rf $(MODLIB)/kernel
873 @rm -f $(MODLIB)/source
874 @mkdir -p $(MODLIB)/kernel
875 @ln -s $(srctree) $(MODLIB)/source
876 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
877 rm -f $(MODLIB)/build ; \
878 ln -s $(objtree) $(MODLIB)/build ; \
880 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
882 # If System.map exists, run depmod. This deliberately does not have a
883 # dependency on System.map since that would run the dependency tree on
884 # busybox. This depmod is only for convenience to give the initial
885 # boot a modules.dep even before / is mounted read-write. However the
886 # boot script depmod is the master version.
887 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
890 depmod_opts := -b $(INSTALL_MOD_PATH) -r
892 PHONY += _modinst_post
893 _modinst_post: _modinst_
894 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
896 else # CONFIG_MODULES
898 # Modules not configured
899 # ---------------------------------------------------------------------------
901 modules modules_install: FORCE
903 @echo "The present busybox configuration has modules disabled."
904 @echo "Type 'make config' and enable loadable module support."
905 @echo "Then build a kernel with module support enabled."
909 endif # CONFIG_MODULES
912 # Cleaning is done on three levels.
913 # make clean Delete most generated files
914 # Leave enough to build external modules
915 # make mrproper Delete the current configuration, and all generated files
916 # make distclean Remove editor backup files, patch leftover files and the like
918 # Directories & files removed with 'make clean'
919 CLEAN_DIRS += $(MODVERDIR)
920 CLEAN_FILES += busybox* System.map .kernelrelease \
921 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
923 # Directories & files removed with 'make mrproper'
924 MRPROPER_DIRS += include/config include2
925 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
927 include/bbconfigopts.h \
928 include/usage_compressed.h \
929 .kernelrelease Module.symvers tags TAGS cscope*
931 # clean - Delete most, but leave enough to build external modules
933 clean: rm-dirs := $(CLEAN_DIRS)
934 clean: rm-files := $(CLEAN_FILES)
935 clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
937 PHONY += $(clean-dirs) clean archclean
939 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
941 clean: archclean $(clean-dirs)
944 @find . $(RCS_FIND_IGNORE) \
945 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
946 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
947 -type f -print | xargs rm -f
949 # mrproper - Delete all generated files, including .config
951 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
952 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
953 mrproper-dirs := $(addprefix _mrproper_,scripts)
955 PHONY += $(mrproper-dirs) mrproper archmrproper
957 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
959 mrproper: clean archmrproper $(mrproper-dirs)
968 @find $(srctree) $(RCS_FIND_IGNORE) \
969 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
970 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
971 -o -name '.*.rej' -o -size 0 \
972 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
973 -type f -print | xargs rm -f
976 # Packaging of the kernel to various formats
977 # ---------------------------------------------------------------------------
978 # rpm target kept for backward compatibility
979 package-dir := $(srctree)/scripts/package
982 $(Q)$(MAKE) $(build)=$(package-dir) $@
984 $(Q)$(MAKE) $(build)=$(package-dir) $@
987 # Brief documentation of the typical targets used
988 # ---------------------------------------------------------------------------
990 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
991 boards := $(notdir $(boards))
993 -include $(srctree)/Makefile.help
995 # Documentation targets
996 # ---------------------------------------------------------------------------
997 %docs: scripts_basic FORCE
998 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1000 else # KBUILD_EXTMOD
1003 # External module support.
1004 # When building external modules the kernel used as basis is considered
1005 # read-only, and no consistency checks are made and the make
1006 # system is not used on the basis kernel. If updates are required
1007 # in the basis kernel ordinary make commands (without M=...) must
1010 # The following are the only valid targets when building external
1012 # make M=dir clean Delete all automatically generated files
1013 # make M=dir modules Make all modules in specified dir
1014 # make M=dir Same as 'make M=dir modules'
1015 # make M=dir modules_install
1016 # Install the modules build in the module directory
1017 # Assumes install directory is already created
1019 # We are always building modules
1021 PHONY += crmodverdir
1023 $(Q)mkdir -p $(MODVERDIR)
1024 $(Q)rm -f $(MODVERDIR)/*
1026 PHONY += $(objtree)/Module.symvers
1027 $(objtree)/Module.symvers:
1028 @test -e $(objtree)/Module.symvers || ( \
1030 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1031 echo " is missing; modules will have no dependencies and modversions."; \
1034 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1035 PHONY += $(module-dirs) modules
1036 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1037 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1039 modules: $(module-dirs)
1040 @echo ' Building modules, stage 2.';
1041 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1043 PHONY += modules_install
1044 modules_install: _emodinst_ _emodinst_post
1046 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1049 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1050 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1052 # Run depmod only is we have System.map and depmod is executable
1053 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1054 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1055 $(DEPMOD) -ae -F System.map \
1056 $(if $(strip $(INSTALL_MOD_PATH)), \
1057 -b $(INSTALL_MOD_PATH) -r) \
1061 PHONY += _emodinst_post
1062 _emodinst_post: _emodinst_
1065 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1067 PHONY += $(clean-dirs) clean
1069 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1071 clean: rm-dirs := $(MODVERDIR)
1072 clean: $(clean-dirs)
1074 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1075 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1076 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1077 -type f -print | xargs rm -f
1080 @echo ' Building external modules.'
1081 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1083 @echo ' modules - default target, build the module(s)'
1084 @echo ' modules_install - install the module'
1085 @echo ' clean - remove generated files in module directory only'
1089 PHONY += prepare scripts
1092 endif # KBUILD_EXTMOD
1094 # Generate tags for editors
1095 # ---------------------------------------------------------------------------
1097 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1098 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1099 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1101 ifeq ($(src),$(obj))
1104 __srctree = $(srctree)/
1107 ifeq ($(ALLSOURCE_ARCHS),)
1109 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1111 ALLINCLUDE_ARCHS := $(ARCH)
1114 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1115 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1118 ALLSOURCE_ARCHS := $(ARCH)
1121 ( find $(__srctree) $(RCS_FIND_IGNORE) \
1122 \( -name include -o -name arch \) -prune -o \
1123 -name '*.[chS]' -print; \
1124 for ARCH in $(ALLSOURCE_ARCHS) ; do \
1125 find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1126 -name '*.[chS]' -print; \
1128 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1129 -name '*.[chS]' -print; \
1130 find $(__srctree)include $(RCS_FIND_IGNORE) \
1131 \( -name config -o -name 'asm-*' \) -prune \
1132 -o -name '*.[chS]' -print; \
1133 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1134 find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1135 -name '*.[chS]' -print; \
1137 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1138 -name '*.[chS]' -print )
1141 quiet_cmd_cscope-file = FILELST cscope.files
1142 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1144 quiet_cmd_cscope = MAKE cscope.out
1145 cmd_cscope = cscope -b
1148 $(call cmd,cscope-file)
1151 quiet_cmd_TAGS = MAKE $@
1154 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
1155 echo "-I __initdata,__exitdata,__acquires,__releases \
1156 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1157 --extra=+f --c-kinds=+px"`; \
1158 $(all-sources) | xargs etags $$ETAGSF -a
1165 quiet_cmd_tags = MAKE $@
1168 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
1169 echo "-I __initdata,__exitdata,__acquires,__releases \
1170 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1171 --extra=+f --c-kinds=+px"`; \
1172 $(all-sources) | xargs ctags $$CTAGSF -a
1179 # Scripts to check various things for consistency
1180 # ---------------------------------------------------------------------------
1183 find * $(RCS_FIND_IGNORE) \
1184 -name '*.[hcS]' -type f -print | sort \
1185 | xargs $(PERL) -w scripts/checkincludes.pl
1188 find * $(RCS_FIND_IGNORE) \
1189 -name '*.[hcS]' -type f -print | sort \
1190 | xargs $(PERL) -w scripts/checkversion.pl
1193 $(PERL) $(srctree)/scripts/namespace.pl
1195 endif #ifeq ($(config-targets),1)
1196 endif #ifeq ($(mixed-targets),1)
1200 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
1201 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1204 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1205 $(error kernelrelease not valid - run 'make *config' to update it))
1207 @echo $(KERNELVERSION)
1210 # ---------------------------------------------------------------------------
1211 # Single targets are compatible with:
1212 # - build whith mixed source and output
1213 # - build with separate output dir 'make O=...'
1214 # - external modules
1216 # target-dir => where to store outputfile
1217 # build-dir => directory in kernel source tree to use
1219 ifeq ($(KBUILD_EXTMOD),)
1220 build-dir = $(patsubst %/,%,$(dir $@))
1221 target-dir = $(dir $@)
1223 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1224 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1225 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1228 %.s: %.c prepare scripts FORCE
1229 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1230 %.i: %.c prepare scripts FORCE
1231 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1232 %.o: %.c prepare scripts FORCE
1233 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1234 %.lst: %.c prepare scripts FORCE
1235 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1236 %.s: %.S prepare scripts FORCE
1237 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1238 %.o: %.S prepare scripts FORCE
1239 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1242 / %/: prepare scripts FORCE
1243 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1244 $(build)=$(build-dir)
1245 %.ko: prepare scripts FORCE
1246 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1247 $(build)=$(build-dir) $(@:.ko=.o)
1248 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1250 # FIXME Should go into a make.lib or something
1251 # ===========================================================================
1253 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1254 cmd_rmdirs = rm -rf $(rm-dirs)
1256 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1257 cmd_rmfiles = rm -f $(rm-files)
1260 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1261 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1262 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1264 quiet_cmd_as_o_S = AS $@
1265 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1267 # read all saved command lines
1269 targets := $(wildcard $(sort $(targets)))
1270 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1272 ifneq ($(cmd_files),)
1273 $(cmd_files): ; # Do not try to update included dependency files
1274 include $(cmd_files)
1277 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1279 # $(Q)$(MAKE) $(clean)=dir
1280 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1282 endif # skip-makefile
1287 -include $(srctree)/Makefile.custom
1289 # Declare the contents of the .PHONY variable as phony. We keep that
1290 # information in a variable se we can use it in if_changed and friends.