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 of
22 # unavoidable when linking the built-in.o targets which finally
23 # turn into vmlinux), 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 syntax'es 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= assigment takes precedence over the KBUILD_OUTPUT environment variable.
84 # KBUILD_SRC is set on invocation of make in OBJ directory
85 # KBUILD_SRC is not intended to be used by the regular user (for now)
88 # OK, Make called in directory where kernel src resides
89 # Do we want to locate output files in a separate directory?
91 ifeq ("$(origin O)", "command line")
96 # That's our default target when none is given on the command line
100 ifneq ($(KBUILD_OUTPUT),)
101 # Invoke a second make in the output directory, passing relevant variables
102 # check that the output directory actually exists
103 saved-output := $(KBUILD_OUTPUT)
104 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
105 $(if $(wildcard $(KBUILD_OUTPUT)),, \
106 $(error output directory "$(saved-output)" does not exist))
108 .PHONY: $(MAKECMDGOALS)
110 $(filter-out _all,$(MAKECMDGOALS)) _all:
111 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
112 KBUILD_SRC=$(CURDIR) KBUILD_VERBOSE=$(KBUILD_VERBOSE) \
113 KBUILD_CHECK=$(KBUILD_CHECK) KBUILD_EXTMOD="$(KBUILD_EXTMOD)" \
114 -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),$(CURDIR))
135 # FIXME - TOPDIR is obsolete, use srctree/objtree
142 export srctree objtree VPATH TOPDIR
144 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
146 # SUBARCH tells the usermode build what the underlying arch is. That is set
147 # first, and if a usermode build is happening, the "ARCH=um" on the command
148 # line overrides the setting of ARCH below. If a native build is happening,
149 # then ARCH is assigned, getting whatever value it gets normally, and
150 # SUBARCH is subsequently ignored.
152 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
153 -e s/arm.*/arm/ -e s/sa110/arm/ \
154 -e s/s390x/s390/ -e s/parisc64/parisc/ )
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)
188 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
191 # Decide whether to build built-in, modular, or both.
192 # Normally, just do built-in.
197 # If we have only "make modules", don't compile built-in objects.
198 # When we're building modules with modversions, we need to consider
199 # the built-in objects during the descend as well, in order to
200 # make sure the checksums are uptodate before we record them.
202 ifeq ($(MAKECMDGOALS),modules)
203 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
206 # If we have "make <whatever> modules", compile modules
207 # in addition to whatever we do anyway.
208 # Just "make" or "make all" shall build modules as well
210 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
214 ifeq ($(MAKECMDGOALS),)
218 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
219 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
222 # ---------------------------------------------------------------------------
224 # Normally, we echo the whole command before executing it. By making
225 # that echo $($(quiet)$(cmd)), we now have the possibility to set
226 # $(quiet) to choose other forms of output instead, e.g.
228 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
229 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
231 # If $(quiet) is empty, the whole command will be printed.
232 # If it is set to "quiet_", only the short version will be printed.
233 # If it is set to "silent_", nothing wil be printed at all, since
234 # the variable $(silent_cmd_cc_o_c) doesn't exist.
236 # A simple variant is to prefix commands with $(Q) - that's usefull
237 # for commands that shall be hidden in non-verbose mode.
241 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
242 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
244 ifeq ($(KBUILD_VERBOSE),1)
252 # If the user is running make -s (silent mode), suppress echoing of
255 ifneq ($(findstring s,$(MAKEFLAGS)),)
259 check_gcc = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
261 export quiet Q KBUILD_VERBOSE check_gcc
263 # Look for make include files relative to root of kernel src
264 MAKEFLAGS += --include-dir=$(srctree)
266 # For maximum performance (+ possibly random breakage, uncomment
271 # Make variables (CC, etc...)
273 AS = $(CROSS_COMPILE)as
274 LD = $(CROSS_COMPILE)ld
275 CC = $(CROSS_COMPILE)gcc
277 AR = $(CROSS_COMPILE)ar
278 NM = $(CROSS_COMPILE)nm
279 STRIP = $(CROSS_COMPILE)strip
280 OBJCOPY = $(CROSS_COMPILE)objcopy
281 OBJDUMP = $(CROSS_COMPILE)objdump
283 GENKSYMS = scripts/genksyms/genksyms
284 DEPMOD = /sbin/depmod
285 KALLSYMS = scripts/kallsyms
289 CFLAGS_MODULE = $(MODFLAGS)
290 AFLAGS_MODULE = $(MODFLAGS)
295 NOSTDINC_FLAGS = -nostdinc -iwithprefix include
297 CPPFLAGS := -D__KERNEL__ -Iinclude \
298 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
300 CFLAGS := -Wall -Wstrict-prototypes -Wno-trigraphs \
301 -fno-strict-aliasing -fno-common
302 AFLAGS := -D__ASSEMBLY__
304 export VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
305 CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
306 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
307 HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB LDFLAGS_MODULE CHECK
309 export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFLAGS LDFLAGS
310 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
311 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
313 # When compiling out-of-tree modules, put MODVERDIR in the module
314 # tree rather than in the kernel tree. The kernel tree might
316 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
318 # The temporary file to save gcc -MD generated dependencies must not
321 depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
323 # Files to ignore in find ... statements
325 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc \) -prune -o
326 RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc
328 # ===========================================================================
329 # Rules shared between *config targets and build targets
331 # Basic helpers built in scripts/
332 .PHONY: scripts_basic
334 $(Q)$(MAKE) $(build)=scripts/basic
336 # To make sure we do not include .config for any of the *config targets
337 # catch them early, and hand them over to scripts/kconfig/Makefile
338 # It is allowed to specify more targets when calling make, including
339 # mixing *config targets and build targets.
340 # For example 'make oldconfig all'.
341 # Detect when mixed targets is specified, and make a second invocation
342 # of make so .config is not included in this case either (for *config).
344 no-dot-config-targets := clean mrproper distclean \
345 cscope TAGS tags help %docs check%
351 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
352 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
357 ifeq ($(KBUILD_EXTMOD),)
358 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
360 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
366 ifeq ($(mixed-targets),1)
367 # ===========================================================================
368 # We're called with mixed targets (*config and build targets).
369 # Handle them one by one.
372 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
375 ifeq ($(config-targets),1)
376 # ===========================================================================
377 # *config targets only - make sure prerequisites are updated, and descend
378 # in scripts/kconfig to make the *config target
380 config: scripts_basic FORCE
381 $(Q)$(MAKE) $(build)=scripts/kconfig $@
382 %config: scripts_basic FORCE
383 $(Q)$(MAKE) $(build)=scripts/kconfig $@
386 # ===========================================================================
387 # Build targets only - this includes vmlinux, arch specific targets, clean
388 # targets and others. In general all targets except *config targets.
390 ifeq ($(KBUILD_EXTMOD),)
391 # Additional helpers built in scripts/
392 # Carefully list dependencies so we do not try to build scripts twice
395 scripts: scripts_basic include/config/MARKER
396 $(Q)$(MAKE) $(build)=$(@)
398 scripts_basic: include/linux/autoconf.h
400 # Objects we will link into vmlinux / subdirs we need to visit
402 drivers-y := drivers/ sound/
406 endif # KBUILD_EXTMOD
408 ifeq ($(dot-config),1)
409 # In this section, we need .config
411 # Read in dependencies to all Kconfig* files, make sure to run
412 # oldconfig if changes are detected.
417 # If .config needs to be updated, it will be done via the dependency
418 # that autoconf has on .config.
419 # To avoid any implicit rule to kick in, define an empty command
422 # If .config is newer than include/linux/autoconf.h, someone tinkered
423 # with it and forgot to run make oldconfig
424 include/linux/autoconf.h: .config
425 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
427 # Dummy target needed, because used as prerequisite
428 include/linux/autoconf.h: ;
431 include $(srctree)/arch/$(ARCH)/Makefile
433 # Default kernel image to build when no specific target is given.
434 # KBUILD_IMAGE may be overruled on the commandline or
435 # set in the environment
436 # Also any assingments in arch/$(ARCH)/Makefiel take precedence over
438 export KBUILD_IMAGE ?= vmlinux
440 # The all: target is the default when no target is given on the
442 # This allow a user to issue only 'make' to build a kernel including modules
443 # Defaults vmlinux but it is usually overriden in the arch makefile
446 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
452 ifndef CONFIG_FRAME_POINTER
453 CFLAGS += -fomit-frame-pointer
456 ifdef CONFIG_DEBUG_INFO
460 # warn about C99 declaration after statement
461 CFLAGS += $(call check_gcc,-Wdeclaration-after-statement,)
464 # INSTALL_PATH specifies where to place the updated kernel and system map
465 # images. Uncomment if you want to place them anywhere other than root.
468 #export INSTALL_PATH=/boot
471 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
472 # relocations required by build roots. This is not defined in the
473 # makefile but the arguement can be passed to make if needed.
476 MODLIB := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
480 ifeq ($(KBUILD_EXTMOD),)
481 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/
483 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
484 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
485 $(net-y) $(net-m) $(libs-y) $(libs-m)))
487 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
489 $(core-n) $(core-) $(drivers-n) $(drivers-) \
490 $(net-n) $(net-) $(libs-n) $(libs-))))
492 init-y := $(patsubst %/, %/built-in.o, $(init-y))
493 core-y := $(patsubst %/, %/built-in.o, $(core-y))
494 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
495 net-y := $(patsubst %/, %/built-in.o, $(net-y))
496 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
497 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
498 libs-y := $(libs-y1) $(libs-y2)
501 # ---------------------------------------------------------------------------
503 # This is a bit tricky: If we need to relink vmlinux, we want
504 # the version number incremented, which means recompile init/version.o
505 # and relink init/init.o. However, we cannot do this during the
506 # normal descending-into-subdirs phase, since at that time
507 # we cannot yet know if we will need to relink vmlinux.
508 # So we descend into init/ inside the rule for vmlinux again.
510 vmlinux-objs := $(head-y) $(init-y) $(core-y) $(libs-y) $(drivers-y) $(net-y)
512 quiet_cmd_vmlinux__ = LD $@
514 $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) $(head-y) $(init-y) \
521 $(filter .tmp_kallsyms%,$^) \
525 # set -e makes the rule exit immediately on error
527 define rule_vmlinux__
529 $(if $(filter .tmp_kallsyms%,$^),, \
530 echo ' GEN .version'; \
531 . $(srctree)/scripts/mkversion > .tmp_version; \
532 mv -f .tmp_version .version; \
533 $(MAKE) $(build)=init; \
535 $(if $($(quiet)cmd_vmlinux__), \
536 echo ' $($(quiet)cmd_vmlinux__)' &&) \
538 echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
541 do_system_map = $(NM) $(1) | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > $(2)
543 LDFLAGS_vmlinux += -T arch/$(ARCH)/kernel/vmlinux.lds.s
545 # Generate section listing all symbols and add it into vmlinux
546 # It's a three stage process:
547 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
549 # Running kallsyms on that gives us .tmp_kallsyms1.o with
551 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
552 # but due to the added section, some addresses have shifted
553 # From here, we generate a correct .tmp_kallsyms2.o
554 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
555 # o Verify that the System.map from vmlinux matches the map from
556 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
557 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
558 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
559 # temporary bypass to allow the kernel to be built while the
560 # maintainers work out what went wrong with kallsyms.
562 ifdef CONFIG_KALLSYMS
564 ifdef CONFIG_KALLSYMS_EXTRA_PASS
570 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
572 define rule_verify_kallsyms
573 @$(call do_system_map, .tmp_vmlinux$(last_kallsyms), .tmp_System.map)
574 @cmp -s System.map .tmp_System.map || \
575 (echo Inconsistent kallsyms data, try setting CONFIG_KALLSYMS_EXTRA_PASS ; rm .tmp_kallsyms* ; false)
578 quiet_cmd_kallsyms = KSYM $@
579 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) $(foreach x,$(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
581 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
582 $(call if_changed_dep,as_o_S)
584 .tmp_kallsyms%.S: .tmp_vmlinux%
587 .tmp_vmlinux1: $(vmlinux-objs) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
588 $(call if_changed_rule,vmlinux__)
590 .tmp_vmlinux2: $(vmlinux-objs) .tmp_kallsyms1.o arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
591 $(call if_changed_rule,vmlinux__)
593 .tmp_vmlinux3: $(vmlinux-objs) .tmp_kallsyms2.o arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
594 $(call if_changed_rule,vmlinux__)
598 # Finally the vmlinux rule
602 $(call do_system_map, $@, System.map)
603 $(rule_verify_kallsyms)
606 vmlinux: $(vmlinux-objs) $(kallsyms.o) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
607 $(call if_changed_rule,vmlinux)
609 # The actual objects are generated when descending,
610 # make sure no implicit rule kicks in
612 $(sort $(vmlinux-objs)) arch/$(ARCH)/kernel/vmlinux.lds.s: $(vmlinux-dirs) ;
614 # Handle descending into subdirectories listed in $(vmlinux-dirs)
615 # Preset locale variables to speed up the build process. Limit locale
616 # tweaks to this spot to avoid wrong language settings when running
617 # make menuconfig etc.
618 # Error messages still appears in the original language
620 .PHONY: $(vmlinux-dirs)
621 $(vmlinux-dirs): prepare-all scripts
622 $(Q)$(MAKE) $(build)=$@
624 # Things we need to do before we recursively start building the kernel
625 # or the modules are listed in "prepare-all".
626 # A multi level approach is used. prepare1 is updated first, then prepare0.
627 # prepare-all is the collection point for the prepare targets.
629 .PHONY: prepare-all prepare prepare0 prepare1 prepare2
631 # prepare 2 generate Makefile to be placed in output directory, if
632 # using a seperate output directory. This allows convinient use
633 # of make in output directory
635 $(Q)if [ ! $(srctree) -ef $(objtree) ]; then \
636 $(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
637 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) \
638 > $(objtree)/Makefile; \
641 # prepare1 is used to check if we are building in a separate output directory,
643 # 1) Check that make has not been executed in the kernel src $(srctree)
644 # 2) Create the include2 directory, used for the second asm symlink
647 ifneq ($(KBUILD_SRC),)
648 @echo ' Using $(srctree) as source for kernel'
649 $(Q)if [ -h $(srctree)/include/asm -o -f $(srctree)/.config ]; then \
650 echo " $(srctree) is not clean, please run 'make mrproper'";\
651 echo " in the '$(srctree)' directory.";\
654 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
655 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
658 prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
659 ifneq ($(KBUILD_MODULES),)
660 $(Q)rm -rf $(MODVERDIR)
661 $(Q)mkdir -p $(MODVERDIR)
664 # All the preparing..
665 prepare-all: prepare0 prepare
667 # Leave this as default for preprocessing vmlinux.lds.S, which is now
668 # done in arch/$(ARCH)/kernel/Makefile
670 export AFLAGS_vmlinux.lds.o += -P -C -U$(ARCH)
673 # ---------------------------------------------------------------------------
675 %.s: %.c scripts FORCE
676 $(Q)$(MAKE) $(build)=$(@D) $@
677 %.i: %.c scripts FORCE
678 $(Q)$(MAKE) $(build)=$(@D) $@
679 %.o: %.c scripts FORCE
680 $(Q)$(MAKE) $(build)=$(@D) $@
681 %/: scripts prepare FORCE
682 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
683 %.lst: %.c scripts FORCE
684 $(Q)$(MAKE) $(build)=$(@D) $@
685 %.s: %.S scripts FORCE
686 $(Q)$(MAKE) $(build)=$(@D) $@
687 %.o: %.S scripts FORCE
688 $(Q)$(MAKE) $(build)=$(@D) $@
690 # FIXME: The asm symlink changes when $(ARCH) changes. That's
691 # hard to detect, but I suppose "make mrproper" is a good idea
692 # before switching between archs anyway.
695 @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
696 $(Q)if [ ! -d include ]; then mkdir -p include; fi;
697 @ln -fsn asm-$(ARCH) $@
699 # Split autoconf.h into include/linux/config/*
701 include/config/MARKER: include/linux/autoconf.h
702 @echo ' SPLIT include/linux/autoconf.h -> include/config/*'
703 @scripts/basic/split-include include/linux/autoconf.h include/config
706 # Generate some files
707 # ---------------------------------------------------------------------------
709 # version.h changes when $(KERNELRELEASE) etc change, as defined in
714 define filechk_version.h
715 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
716 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
719 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
720 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
721 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
725 include/linux/version.h: Makefile
726 $(call filechk,version.h)
728 # ---------------------------------------------------------------------------
732 @echo '*** Warning: make $@ is unnecessary now.'
734 # ---------------------------------------------------------------------------
739 # By default, build modules as well
746 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
747 @echo ' Building modules, stage 2.';
748 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
751 # Target to prepare building external modules
752 .PHONY: modules_prepare
753 modules_prepare: prepare-all scripts
755 # Target to install modules
756 .PHONY: modules_install
757 modules_install: _modinst_ _modinst_post
761 @if [ -z "`$(DEPMOD) -V | grep module-init-tools`" ]; then \
762 echo "Warning: you may need to install module-init-tools"; \
763 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
766 @rm -rf $(MODLIB)/kernel
767 @rm -f $(MODLIB)/source
768 @mkdir -p $(MODLIB)/kernel
769 @ln -s $(srctree) $(MODLIB)/source
770 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
771 rm -f $(MODLIB)/build ; \
772 ln -s $(objtree) $(MODLIB)/build ; \
774 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
776 # If System.map exists, run depmod. This deliberately does not have a
777 # dependency on System.map since that would run the dependency tree on
778 # vmlinux. This depmod is only for convenience to give the initial
779 # boot a modules.dep even before / is mounted read-write. However the
780 # boot script depmod is the master version.
781 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
784 depmod_opts := -b $(INSTALL_MOD_PATH) -r
786 .PHONY: _modinst_post
787 _modinst_post: _modinst_
788 if [ -r System.map ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
790 else # CONFIG_MODULES
792 # Modules not configured
793 # ---------------------------------------------------------------------------
795 modules modules_install: FORCE
797 @echo "The present kernel configuration has modules disabled."
798 @echo "Type 'make config' and enable loadable module support."
799 @echo "Then build a kernel with module support enabled."
803 endif # CONFIG_MODULES
805 # Generate asm-offsets.h
806 # ---------------------------------------------------------------------------
808 define filechk_gen-asm-offsets
810 echo "#ifndef __ASM_OFFSETS_H__"; \
811 echo "#define __ASM_OFFSETS_H__"; \
813 echo " * DO NOT MODIFY."; \
815 echo " * This file was generated by arch/$(ARCH)/Makefile"; \
819 sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
826 # Cleaning is done on three levels.
827 # make clean Delete most generated files
828 # Leave enough to build external modules
829 # make mrproper Delete the current configuration, and all generated files
830 # make distclean Remove editor backup files, patch leftover files and the like
832 # Directories & files removed with 'make clean'
833 CLEAN_DIRS += $(MODVERDIR)
834 CLEAN_FILES += vmlinux System.map \
835 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
837 # Directories & files removed with 'make mrproper'
838 MRPROPER_DIRS += include/config include2
839 MRPROPER_FILES += .config .config.old include/asm .version \
840 include/linux/autoconf.h include/linux/version.h \
841 Module.symvers tags TAGS cscope*
843 # clean - Delete most, but leave enough to build external modules
845 clean: rm-dirs := $(CLEAN_DIRS)
846 clean: rm-files := $(CLEAN_FILES)
847 clean-dirs := $(addprefix _clean_,$(vmlinux-alldirs))
849 .PHONY: $(clean-dirs) clean archclean
851 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
853 clean: archclean $(clean-dirs)
856 @find . $(RCS_FIND_IGNORE) \
857 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
858 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
859 -type f -print | xargs rm -f
861 # mrproper - Delete all generated files, including .config
863 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
864 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
865 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
867 .PHONY: $(mrproper-dirs) mrproper archmrproper
869 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
871 mrproper: clean archmrproper $(mrproper-dirs)
880 @find $(srctree) $(RCS_FIND_IGNORE) \
881 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
882 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
883 -o -name '.*.rej' -o -size 0 \
884 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
885 -type f -print | xargs rm -f
888 # Packaging of the kernel to various formats
889 # ---------------------------------------------------------------------------
890 # rpm target kept for backward compatibility
891 package-dir := $(srctree)/scripts/package
896 $(Q)$(MAKE) -f $(package-dir)/Makefile $@
898 $(Q)$(MAKE) -f $(package-dir)/Makefile $@
901 # Brief documentation of the typical targets used
902 # ---------------------------------------------------------------------------
904 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
905 boards := $(notdir $(boards))
908 @echo 'Cleaning targets:'
909 @echo ' clean - remove most generated files but keep the config'
910 @echo ' mrproper - remove all generated files + config + various backup files'
912 @echo 'Configuration targets:'
913 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
915 @echo 'Other generic targets:'
916 @echo ' all - Build all targets marked with [*]'
917 @echo '* vmlinux - Build the bare kernel'
918 @echo '* modules - Build all modules'
919 @echo ' modules_install - Install all modules'
920 @echo ' dir/ - Build all files in dir and below'
921 @echo ' dir/file.[ois] - Build specified target only'
922 @echo ' rpm - Build a kernel as an RPM package'
923 @echo ' tags/TAGS - Generate tags file for editors'
924 @echo ' cscope - Generate cscope index'
925 @echo ' checkstack - Generate a list of stack hogs'
926 @echo 'Kernel packaging:'
927 @$(MAKE) -f $(package-dir)/Makefile help
929 @echo 'Documentation targets:'
930 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
932 @echo 'Architecture specific targets ($(ARCH)):'
933 @$(if $(archhelp),$(archhelp),\
934 echo ' No architecture specific help defined for $(ARCH)')
937 $(foreach b, $(boards), \
938 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
941 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
942 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
943 @echo ' make C=1 [targets] Check all c source with checker tool'
945 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
946 @echo 'For further info see the ./README file'
949 # Documentation targets
950 # ---------------------------------------------------------------------------
951 %docs: scripts_basic FORCE
952 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
957 # External module support.
958 # When building external modules the kernel used as basis is considered
959 # read-only, and no consistency checks are made and the make
960 # system is not used on the basis kernel. If updates are required
961 # in the basis kernel ordinary make commands (without M=...) must
964 # The following are the only valid targets when building external
966 # make M=dir clean Delete all automatically generated files
967 # make M=dir modules Make all modules in specified dir
968 # make M=dir Same as 'make M=dir modules'
969 # make M=dir modules_install
970 # Install the modules build in the module directory
971 # Assumes install directory is already created
973 # We are always building modules
977 $(Q)mkdir -p $(MODVERDIR)
979 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
980 .PHONY: $(module-dirs) modules
981 $(module-dirs): crmodverdir
982 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
984 modules: $(module-dirs)
985 @echo ' Building modules, stage 2.';
986 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
988 .PHONY: modules_install
990 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
992 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
994 .PHONY: $(clean-dirs) clean
996 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
998 clean: rm-dirs := $(MODVERDIR)
1001 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1002 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1003 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1004 -type f -print | xargs rm -f
1007 @echo ' Building external modules.'
1008 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1010 @echo ' modules - default target, build the module(s)'
1011 @echo ' modules_install - install the module'
1012 @echo ' clean - remove generated files in module directory only'
1014 endif # KBUILD_EXTMOD
1016 # Generate tags for editors
1017 # ---------------------------------------------------------------------------
1020 ( find $(srctree) $(RCS_FIND_IGNORE) \
1021 \( -name include -o -name arch \) -prune -o \
1022 -name '*.[chS]' -print; \
1023 find $(srctree)/arch/$(ARCH) $(RCS_FIND_IGNORE) \
1024 -name '*.[chS]' -print; \
1025 find $(srctree)/security/selinux/include $(RCS_FIND_IGNORE) \
1026 -name '*.[chS]' -print; \
1027 find $(srctree)/include $(RCS_FIND_IGNORE) \
1028 \( -name config -o -name 'asm-*' \) -prune \
1029 -o -name '*.[chS]' -print; \
1030 find $(srctree)/include/asm-$(ARCH) $(RCS_FIND_IGNORE) \
1031 -name '*.[chS]' -print; \
1032 find $(srctree)/include/asm-generic $(RCS_FIND_IGNORE) \
1033 -name '*.[chS]' -print )
1036 quiet_cmd_cscope-file = FILELST cscope.files
1037 cmd_cscope-file = $(all-sources) > cscope.files
1039 quiet_cmd_cscope = MAKE cscope.out
1040 cmd_cscope = cscope -k -b -q
1043 $(call cmd,cscope-file)
1046 quiet_cmd_TAGS = MAKE $@
1047 cmd_TAGS = $(all-sources) | etags -
1049 # Exuberant ctags works better with -I
1051 quiet_cmd_tags = MAKE $@
1054 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
1055 $(all-sources) | xargs ctags $$CTAGSF -a
1065 # Scripts to check various things for consistency
1066 # ---------------------------------------------------------------------------
1069 find * $(RCS_FIND_IGNORE) \
1070 -name '*.[hcS]' -type f -print | sort \
1071 | xargs $(PERL) -w scripts/checkconfig.pl
1074 find * $(RCS_FIND_IGNORE) \
1075 -name '*.[hcS]' -type f -print | sort \
1076 | xargs $(PERL) -w scripts/checkincludes.pl
1079 find * $(RCS_FIND_IGNORE) \
1080 -name '*.[hcS]' -type f -print | sort \
1081 | xargs $(PERL) -w scripts/checkversion.pl
1084 $(PERL) scripts/reference_discarded.pl
1085 $(PERL) scripts/reference_init.pl
1087 endif #ifeq ($(config-targets),1)
1088 endif #ifeq ($(mixed-targets),1)
1092 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1093 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1095 # FIXME Should go into a make.lib or something
1096 # ===========================================================================
1098 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1099 cmd_rmdirs = rm -rf $(rm-dirs)
1101 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1102 cmd_rmfiles = rm -f $(rm-files)
1105 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1106 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1107 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1109 quiet_cmd_as_o_S = AS $@
1110 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1112 # read all saved command lines
1114 targets := $(wildcard $(sort $(targets)))
1115 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1117 ifneq ($(cmd_files),)
1118 $(cmd_files): ; # Do not try to update included dependency files
1119 include $(cmd_files)
1122 # execute the command and also postprocess generated .d dependencies
1125 if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
1126 $(filter-out $(cmd_$(1)),$(cmd_$@))\
1127 $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1129 $(if $($(quiet)cmd_$(1)),echo ' $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1131 scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
1133 mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
1135 # Usage: $(call if_changed_rule,foo)
1136 # will check if $(cmd_foo) changed, or any of the prequisites changed,
1137 # and if so will execute $(rule_foo)
1139 if_changed_rule = $(if $(strip $? \
1140 $(filter-out $(cmd_$(1)),$(cmd_$(@F)))\
1141 $(filter-out $(cmd_$(@F)),$(cmd_$(1)))),\
1144 # If quiet is set, only print short version of command
1146 cmd = @$(if $($(quiet)cmd_$(1)),echo ' $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
1148 # filechk is used to check if the content of a generated file is updated.
1150 # define filechk_sample
1151 # echo $KERNELRELEASE
1153 # version.h : Makefile
1154 # $(call filechk,sample)
1155 # The rule defined shall write to stdout the content of the new file.
1156 # The existing file will be compared with the new one.
1157 # - If no file exist it is created
1158 # - If the content differ the new file is used
1159 # - If they are equal no change, and no timestamp update
1164 mkdir -p $(dir $@); \
1165 $(filechk_$(1)) < $< > $@.tmp; \
1166 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
1174 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1176 # $(Q)$(MAKE) $(build)=dir
1177 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
1179 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1181 # $(Q)$(MAKE) $(clean)=dir
1182 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1184 # $(call descend,<dir>,<target>)
1185 # Recursively call a sub-make in <dir> with target <target>
1186 # Usage is deprecated, because make does not see this as an invocation of make.
1187 descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
1189 endif # skip-makefile