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.
14 # o use make's built-in rules and variables
15 # (this increases performance and avoids hard-to-debug behaviour);
16 # o print "Entering directory ...";
17 MAKEFLAGS += -rR --no-print-directory
19 # Add custom flags here to avoid conflict with updates
20 EXTRAVERSION := $(EXTRAVERSION)-omap1
22 # We are using a recursive build, so we need to do a little thinking
23 # to get the ordering right.
25 # Most importantly: sub-Makefiles should only ever modify files in
26 # their own directory. If in some directory we have a dependency on
27 # a file in another dir (which doesn't happen often, but it's often
28 # unavoidable when linking the built-in.o targets which finally
29 # turn into vmlinux), we will call a sub make in that other dir, and
30 # after that we are sure that everything which is in that other dir
33 # The only cases where we need to modify files which have global
34 # effects are thus separated out and done before the recursive
35 # descending is started. They are now explicitly listed as the
38 # To put more focus on warnings, be less verbose as default
39 # Use 'make V=1' to see the full commands
42 ifeq ("$(origin V)", "command line")
50 # Call a source code checker (by default, "sparse") as part of the
53 # Use 'make C=1' to enable checking of only re-compiled files.
54 # Use 'make C=2' to enable checking of *all* source files, regardless
55 # of whether they are re-compiled or not.
57 # See the file "Documentation/sparse.txt" for more details, including
58 # where to get the "sparse" utility.
61 ifeq ("$(origin C)", "command line")
62 KBUILD_CHECKSRC = $(C)
65 ifndef KBUILD_CHECKSRC
69 # Use make M=dir to specify directory of external module to build
70 # Old syntax make ... SUBDIRS=$PWD is still supported
71 # Setting the environment variable KBUILD_EXTMOD take precedence
73 KBUILD_EXTMOD ?= $(SUBDIRS)
76 ifeq ("$(origin M)", "command line")
82 # kbuild supports saving output files in a separate directory.
83 # To locate output files in a separate directory two syntaxes are supported.
84 # In both cases the working directory must be the root of the kernel src.
86 # Use "make O=dir/to/store/output/files/"
88 # 2) Set KBUILD_OUTPUT
89 # Set the environment variable KBUILD_OUTPUT to point to the directory
90 # where the output files shall be placed.
91 # export KBUILD_OUTPUT=dir/to/store/output/files/
94 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
98 # KBUILD_SRC is set on invocation of make in OBJ directory
99 # KBUILD_SRC is not intended to be used by the regular user (for now)
100 ifeq ($(KBUILD_SRC),)
102 # OK, Make called in directory where kernel src resides
103 # Do we want to locate output files in a separate directory?
105 ifeq ("$(origin O)", "command line")
106 KBUILD_OUTPUT := $(O)
110 # That's our default target when none is given on the command line
114 # Cancel implicit rules on top Makefile
115 $(CURDIR)/Makefile Makefile: ;
117 ifneq ($(KBUILD_OUTPUT),)
118 # Invoke a second make in the output directory, passing relevant variables
119 # check that the output directory actually exists
120 saved-output := $(KBUILD_OUTPUT)
121 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
122 $(if $(KBUILD_OUTPUT),, \
123 $(error output directory "$(saved-output)" does not exist))
125 PHONY += $(MAKECMDGOALS) sub-make
127 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
131 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
132 KBUILD_SRC=$(CURDIR) \
133 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
134 $(filter-out _all sub-make,$(MAKECMDGOALS))
136 # Leave processing to above invocation of make
138 endif # ifneq ($(KBUILD_OUTPUT),)
139 endif # ifeq ($(KBUILD_SRC),)
141 # We process the rest of the Makefile if this is the final invocation of make
142 ifeq ($(skip-makefile),)
144 # If building an external module we do not care about the all: rule
145 # but instead _all depend on modules
147 ifeq ($(KBUILD_EXTMOD),)
153 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
155 # FIXME - TOPDIR is obsolete, use srctree/objtree
160 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
162 export srctree objtree VPATH TOPDIR
165 # SUBARCH tells the usermode build what the underlying arch is. That is set
166 # first, and if a usermode build is happening, the "ARCH=um" on the command
167 # line overrides the setting of ARCH below. If a native build is happening,
168 # then ARCH is assigned, getting whatever value it gets normally, and
169 # SUBARCH is subsequently ignored.
171 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
172 -e s/arm.*/arm/ -e s/sa110/arm/ \
173 -e s/s390x/s390/ -e s/parisc64/parisc/ \
174 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
179 # Cross compiling and selecting different set of gcc/bin-utils
180 # ---------------------------------------------------------------------------
182 # When performing cross compilation for other architectures ARCH shall be set
183 # to the target architecture. (See arch/* for the possibilities).
184 # ARCH can be set during invocation of make:
186 # Another way is to have ARCH set in the environment.
187 # The default ARCH is the host where make is executed.
189 # CROSS_COMPILE specify the prefix used for all executables used
190 # during compilation. Only gcc and related bin-utils executables
191 # are prefixed with $(CROSS_COMPILE).
192 # CROSS_COMPILE can be set on the command line
193 # make CROSS_COMPILE=ia64-linux-
194 # Alternatively CROSS_COMPILE can be set in the environment.
195 # Default value for CROSS_COMPILE is not to prefix executables
196 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
197 export KBUILD_BUILDHOST := $(SUBARCH)
199 CROSS_COMPILE ?= arm-linux-
201 # Architecture as present in compile.h
202 UTS_MACHINE := $(ARCH)
205 # Additional ARCH settings for x86
209 ifeq ($(ARCH),x86_64)
213 # Where to locate arch specific headers
214 ifeq ($(ARCH),sparc64)
217 hdr-arch := $(SRCARCH)
220 KCONFIG_CONFIG ?= .config
222 # SHELL used by kbuild
223 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
224 else if [ -x /bin/bash ]; then echo /bin/bash; \
225 else echo sh; fi ; fi)
229 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
232 # Decide whether to build built-in, modular, or both.
233 # Normally, just do built-in.
238 # If we have only "make modules", don't compile built-in objects.
239 # When we're building modules with modversions, we need to consider
240 # the built-in objects during the descend as well, in order to
241 # make sure the checksums are up to date before we record them.
243 ifeq ($(MAKECMDGOALS),modules)
244 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
247 # If we have "make <whatever> modules", compile modules
248 # in addition to whatever we do anyway.
249 # Just "make" or "make all" shall build modules as well
251 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
255 ifeq ($(MAKECMDGOALS),)
259 export KBUILD_MODULES KBUILD_BUILTIN
260 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
263 # ---------------------------------------------------------------------------
265 # Normally, we echo the whole command before executing it. By making
266 # that echo $($(quiet)$(cmd)), we now have the possibility to set
267 # $(quiet) to choose other forms of output instead, e.g.
269 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
270 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
272 # If $(quiet) is empty, the whole command will be printed.
273 # If it is set to "quiet_", only the short version will be printed.
274 # If it is set to "silent_", nothing will be printed at all, since
275 # the variable $(silent_cmd_cc_o_c) doesn't exist.
277 # A simple variant is to prefix commands with $(Q) - that's useful
278 # for commands that shall be hidden in non-verbose mode.
282 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
283 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
285 ifeq ($(KBUILD_VERBOSE),1)
293 # If the user is running make -s (silent mode), suppress echoing of
296 ifneq ($(findstring s,$(MAKEFLAGS)),)
300 export quiet Q KBUILD_VERBOSE
303 # Look for make include files relative to root of kernel src
304 MAKEFLAGS += --include-dir=$(srctree)
306 # We need some generic definitions (do not try to remake the file).
307 $(srctree)/scripts/Kbuild.include: ;
308 include $(srctree)/scripts/Kbuild.include
310 # Make variables (CC, etc...)
312 AS = $(CROSS_COMPILE)as
313 LD = $(CROSS_COMPILE)ld
314 CC = $(CROSS_COMPILE)gcc
316 AR = $(CROSS_COMPILE)ar
317 NM = $(CROSS_COMPILE)nm
318 STRIP = $(CROSS_COMPILE)strip
319 OBJCOPY = $(CROSS_COMPILE)objcopy
320 OBJDUMP = $(CROSS_COMPILE)objdump
322 GENKSYMS = scripts/genksyms/genksyms
323 DEPMOD = /sbin/depmod
324 KALLSYMS = scripts/kallsyms
328 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
330 CFLAGS_MODULE = $(MODFLAGS)
331 AFLAGS_MODULE = $(MODFLAGS)
337 # Use LINUXINCLUDE when you must reference the include/ directory.
338 # Needed to be compatible with the O= option
339 LINUXINCLUDE := -Iinclude \
340 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
341 -I$(srctree)/arch/$(hdr-arch)/include \
342 -include include/linux/autoconf.h
344 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
346 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
347 -fno-strict-aliasing -fno-common \
348 -Werror-implicit-function-declaration
349 KBUILD_AFLAGS := -D__ASSEMBLY__
351 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
352 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
353 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
355 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
356 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
357 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
358 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
360 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
361 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
362 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
364 # When compiling out-of-tree modules, put MODVERDIR in the module
365 # tree rather than in the kernel tree. The kernel tree might
367 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
369 # Files to ignore in find ... statements
371 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
372 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
374 # ===========================================================================
375 # Rules shared between *config targets and build targets
377 # Basic helpers built in scripts/
378 PHONY += scripts_basic
380 $(Q)$(MAKE) $(build)=scripts/basic
382 # To avoid any implicit rule to kick in, define an empty command.
383 scripts/basic/%: scripts_basic ;
385 PHONY += outputmakefile
386 # outputmakefile generates a Makefile in the output directory, if using a
387 # separate output directory. This allows convenient use of make in the
390 ifneq ($(KBUILD_SRC),)
391 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
392 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
395 # To make sure we do not include .config for any of the *config targets
396 # catch them early, and hand them over to scripts/kconfig/Makefile
397 # It is allowed to specify more targets when calling make, including
398 # mixing *config targets and build targets.
399 # For example 'make oldconfig all'.
400 # Detect when mixed targets is specified, and make a second invocation
401 # of make so .config is not included in this case either (for *config).
403 no-dot-config-targets := clean mrproper distclean \
404 cscope TAGS tags help %docs check% \
405 include/linux/version.h headers_% \
406 kernelrelease kernelversion
412 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
413 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
418 ifeq ($(KBUILD_EXTMOD),)
419 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
421 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
427 ifeq ($(mixed-targets),1)
428 # ===========================================================================
429 # We're called with mixed targets (*config and build targets).
430 # Handle them one by one.
433 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
436 ifeq ($(config-targets),1)
437 # ===========================================================================
438 # *config targets only - make sure prerequisites are updated, and descend
439 # in scripts/kconfig to make the *config target
441 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
442 # KBUILD_DEFCONFIG may point out an alternative default configuration
443 # used for 'make defconfig'
444 include $(srctree)/arch/$(SRCARCH)/Makefile
445 export KBUILD_DEFCONFIG
447 config %config: scripts_basic outputmakefile FORCE
448 $(Q)mkdir -p include/linux include/config
449 $(Q)$(MAKE) $(build)=scripts/kconfig $@
452 # ===========================================================================
453 # Build targets only - this includes vmlinux, arch specific targets, clean
454 # targets and others. In general all targets except *config targets.
456 ifeq ($(KBUILD_EXTMOD),)
457 # Additional helpers built in scripts/
458 # Carefully list dependencies so we do not try to build scripts twice
461 scripts: scripts_basic include/config/auto.conf
462 $(Q)$(MAKE) $(build)=$(@)
464 # Objects we will link into vmlinux / subdirs we need to visit
466 drivers-y := drivers/ sound/ firmware/
470 endif # KBUILD_EXTMOD
472 ifeq ($(dot-config),1)
474 -include include/config/auto.conf
476 ifeq ($(KBUILD_EXTMOD),)
477 # Read in dependencies to all Kconfig* files, make sure to run
478 # oldconfig if changes are detected.
479 -include include/config/auto.conf.cmd
481 # To avoid any implicit rule to kick in, define an empty command
482 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
484 # If .config is newer than include/config/auto.conf, someone tinkered
485 # with it and forgot to run make oldconfig.
486 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
487 # we execute the config step to be sure to catch updated Kconfig files
488 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
489 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
491 # external modules needs include/linux/autoconf.h and include/config/auto.conf
492 # but do not care if they are up-to-date. Use auto.conf to trigger the test
493 PHONY += include/config/auto.conf
495 include/config/auto.conf:
496 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
498 echo " ERROR: Kernel configuration is invalid."; \
499 echo " include/linux/autoconf.h or $@ are missing."; \
500 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
504 endif # KBUILD_EXTMOD
507 # Dummy target needed, because used as prerequisite
508 include/config/auto.conf: ;
509 endif # $(dot-config)
511 # The all: target is the default when no target is given on the
513 # This allow a user to issue only 'make' to build a kernel including modules
514 # Defaults vmlinux but it is usually overridden in the arch makefile
517 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
523 include $(srctree)/arch/$(SRCARCH)/Makefile
525 ifneq (CONFIG_FRAME_WARN,0)
526 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
529 # Force gcc to behave correct even for buggy distributions
530 # Arch Makefiles may override this setting
531 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
533 ifdef CONFIG_FRAME_POINTER
534 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
536 KBUILD_CFLAGS += -fomit-frame-pointer
539 ifdef CONFIG_DEBUG_INFO
541 KBUILD_AFLAGS += -gdwarf-2
548 # We trigger additional mismatches with less inlining
549 ifdef CONFIG_DEBUG_SECTION_MISMATCH
550 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
553 # arch Makefile may override CC so keep this after arch Makefile is included
554 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
555 CHECKFLAGS += $(NOSTDINC_FLAGS)
557 # warn about C99 declaration after statement
558 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
560 # disable pointer signed / unsigned warnings in gcc 4.0
561 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
563 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
564 # But warn user when we do so
566 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
568 ifneq ($(KCPPFLAGS),)
569 $(call warn-assign,CPPFLAGS)
570 KBUILD_CPPFLAGS += $(KCPPFLAGS)
573 $(call warn-assign,AFLAGS)
574 KBUILD_AFLAGS += $(KAFLAGS)
577 $(call warn-assign,CFLAGS)
578 KBUILD_CFLAGS += $(KCFLAGS)
581 # Use --build-id when available.
582 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
583 $(call ld-option, -Wl$(comma)--build-id,))
584 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
585 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
587 # Default kernel image to build when no specific target is given.
588 # KBUILD_IMAGE may be overruled on the command line or
589 # set in the environment
590 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
592 export KBUILD_IMAGE ?= vmlinux
595 # INSTALL_PATH specifies where to place the updated kernel and system map
596 # images. Default is /boot, but you can set it to other values
597 export INSTALL_PATH ?= /boot
600 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
601 # relocations required by build roots. This is not defined in the
602 # makefile but the argument can be passed to make if needed.
605 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
609 # INSTALL_MOD_STRIP, if defined, will cause modules to be
610 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
611 # the default option --strip-debug will be used. Otherwise,
612 # INSTALL_MOD_STRIP will used as the options to the strip command.
614 ifdef INSTALL_MOD_STRIP
615 ifeq ($(INSTALL_MOD_STRIP),1)
616 mod_strip_cmd = $(STRIP) --strip-debug
618 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
619 endif # INSTALL_MOD_STRIP=1
622 endif # INSTALL_MOD_STRIP
626 ifeq ($(KBUILD_EXTMOD),)
627 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
629 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
630 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
631 $(net-y) $(net-m) $(libs-y) $(libs-m)))
633 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
635 $(core-n) $(core-) $(drivers-n) $(drivers-) \
636 $(net-n) $(net-) $(libs-n) $(libs-))))
638 init-y := $(patsubst %/, %/built-in.o, $(init-y))
639 core-y := $(patsubst %/, %/built-in.o, $(core-y))
640 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
641 net-y := $(patsubst %/, %/built-in.o, $(net-y))
642 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
643 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
644 libs-y := $(libs-y1) $(libs-y2)
647 # ---------------------------------------------------------------------------
648 # vmlinux is built from the objects selected by $(vmlinux-init) and
649 # $(vmlinux-main). Most are built-in.o files from top-level directories
650 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
651 # Ordering when linking is important, and $(vmlinux-init) must be first.
656 # +-< $(vmlinux-init)
657 # | +--< init/version.o + more
659 # +--< $(vmlinux-main)
660 # | +--< driver/built-in.o mm/built-in.o + more
662 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
664 # vmlinux version (uname -v) cannot be updated during normal
665 # descending-into-subdirs phase since we do not yet know if we need to
667 # Therefore this step is delayed until just before final link of vmlinux -
668 # except in the kallsyms case where it is done just before adding the
669 # symbols to the kernel.
671 # System.map is generated to document addresses of all kernel symbols
673 vmlinux-init := $(head-y) $(init-y)
674 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
675 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
676 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
677 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
679 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
680 # May be overridden by arch/$(ARCH)/Makefile
681 quiet_cmd_vmlinux__ ?= LD $@
682 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
683 -T $(vmlinux-lds) $(vmlinux-init) \
684 --start-group $(vmlinux-main) --end-group \
685 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
687 # Generate new vmlinux version
688 quiet_cmd_vmlinux_version = GEN .version
689 cmd_vmlinux_version = set -e; \
690 if [ ! -r .version ]; then \
694 mv .version .old_version; \
695 expr 0$$(cat .old_version) + 1 >.version; \
697 $(MAKE) $(build)=init
699 # Generate System.map
700 quiet_cmd_sysmap = SYSMAP
701 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
704 # If CONFIG_KALLSYMS is set .version is already updated
705 # Generate System.map and verify that the content is consistent
706 # Use + in front of the vmlinux_version rule to silent warning with make -j2
707 # First command is ':' to allow us to use + in front of the rule
708 define rule_vmlinux__
710 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
712 $(call cmd,vmlinux__)
713 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
715 $(Q)$(if $($(quiet)cmd_sysmap), \
716 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
717 $(cmd_sysmap) $@ System.map; \
718 if [ $$? -ne 0 ]; then \
726 ifdef CONFIG_KALLSYMS
727 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
728 # It's a three stage process:
729 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
731 # Running kallsyms on that gives us .tmp_kallsyms1.o with
732 # the right size - vmlinux version (uname -v) is updated during this step
733 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
734 # but due to the added section, some addresses have shifted.
735 # From here, we generate a correct .tmp_kallsyms2.o
736 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
737 # o Verify that the System.map from vmlinux matches the map from
738 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
739 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
740 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
741 # temporary bypass to allow the kernel to be built while the
742 # maintainers work out what went wrong with kallsyms.
744 ifdef CONFIG_KALLSYMS_EXTRA_PASS
750 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
752 define verify_kallsyms
753 $(Q)$(if $($(quiet)cmd_sysmap), \
754 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
755 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
756 $(Q)cmp -s System.map .tmp_System.map || \
757 (echo Inconsistent kallsyms data; \
758 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
759 rm .tmp_kallsyms* ; /bin/false )
762 # Update vmlinux version before link
763 # Use + in front of this rule to silent warning about make -j1
764 # First command is ':' to allow us to use + in front of this rule
765 cmd_ksym_ld = $(cmd_vmlinux__)
768 +$(call cmd,vmlinux_version)
769 $(call cmd,vmlinux__)
770 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
773 # Generate .S file with all kernel symbols
774 quiet_cmd_kallsyms = KSYM $@
775 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
776 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
778 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
779 $(call if_changed_dep,as_o_S)
781 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
784 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
785 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
786 $(call if_changed_rule,ksym_ld)
788 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
789 $(call if_changed,vmlinux__)
791 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
792 $(call if_changed,vmlinux__)
794 # Needs to visit scripts/ before $(KALLSYMS) can be used.
795 $(KALLSYMS): scripts ;
797 # Generate some data for debugging strange kallsyms problems
798 debug_kallsyms: .tmp_map$(last_kallsyms)
800 .tmp_map%: .tmp_vmlinux% FORCE
801 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
807 endif # ifdef CONFIG_KALLSYMS
809 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
810 # relevant sections renamed as per the linker script.
811 quiet_cmd_vmlinux-modpost = LD $@
812 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
813 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
814 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
815 define rule_vmlinux-modpost
817 +$(call cmd,vmlinux-modpost)
818 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
819 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
822 # vmlinux image - including updated kernel symbols
823 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
824 ifdef CONFIG_HEADERS_CHECK
825 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
828 $(Q)$(MAKE) $(build)=samples
830 ifdef CONFIG_BUILD_DOCSRC
831 $(Q)$(MAKE) $(build)=Documentation
833 $(call vmlinux-modpost)
834 $(call if_changed_rule,vmlinux__)
835 $(Q)rm -f .old_version
837 # build vmlinux.o first to catch section mismatch errors early
838 ifdef CONFIG_KALLSYMS
839 .tmp_vmlinux1: vmlinux.o
842 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
843 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
844 $(call if_changed_rule,vmlinux-modpost)
846 # The actual objects are generated when descending,
847 # make sure no implicit rule kicks in
848 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
850 # Handle descending into subdirectories listed in $(vmlinux-dirs)
851 # Preset locale variables to speed up the build process. Limit locale
852 # tweaks to this spot to avoid wrong language settings when running
853 # make menuconfig etc.
854 # Error messages still appears in the original language
856 PHONY += $(vmlinux-dirs)
857 $(vmlinux-dirs): prepare scripts
858 $(Q)$(MAKE) $(build)=$@
860 # Build the kernel release string
862 # The KERNELRELEASE value built here is stored in the file
863 # include/config/kernel.release, and is used when executing several
864 # make targets, such as "make install" or "make modules_install."
866 # The eventual kernel release string consists of the following fields,
867 # shown in a hierarchical format to show how smaller parts are concatenated
868 # to form the larger and final value, with values coming from places like
869 # the Makefile, kernel config options, make command line options and/or
870 # SCM tag information.
874 # $(PATCHLEVEL) eg, 6
876 # $(EXTRAVERSION) eg, -rc6
879 # localversion* (files without backups, containing '~')
880 # $(CONFIG_LOCALVERSION) (from kernel config setting)
881 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
882 # ./scripts/setlocalversion (SCM tag, if one exists)
883 # $(LOCALVERSION) (from make command line if provided)
885 # Note how the final $(localver-auto) string is included *only* if the
886 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
887 # moment, only git is supported but other SCMs can edit the script
888 # scripts/setlocalversion and add the appropriate checks as needed.
890 pattern = ".*/localversion[^~]*"
891 string = $(shell cat /dev/null \
892 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
894 localver = $(subst $(space),, $(string) \
895 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
897 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
898 # and if the SCM is know a tag from the SCM is appended.
899 # The appended tag is determined by the SCM used.
901 # Currently, only git is supported.
902 # Other SCMs can edit scripts/setlocalversion and add the appropriate
904 ifdef CONFIG_LOCALVERSION_AUTO
905 _localver-auto = $(shell $(CONFIG_SHELL) \
906 $(srctree)/scripts/setlocalversion $(srctree))
907 localver-auto = $(LOCALVERSION)$(_localver-auto)
910 localver-full = $(localver)$(localver-auto)
912 # Store (new) KERNELRELASE string in include/config/kernel.release
913 kernelrelease = $(KERNELVERSION)$(localver-full)
914 include/config/kernel.release: include/config/auto.conf FORCE
916 $(Q)echo $(kernelrelease) > $@
919 # Things we need to do before we recursively start building the kernel
920 # or the modules are listed in "prepare".
921 # A multi level approach is used. prepareN is processed before prepareN-1.
922 # archprepare is used in arch Makefiles and when processed asm symlink,
923 # version.h and scripts_basic is processed / created.
925 # Listed in dependency order
926 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
928 # prepare3 is used to check if we are building in a separate output directory,
930 # 1) Check that make has not been executed in the kernel src $(srctree)
931 # 2) Create the include2 directory, used for the second asm symlink
932 prepare3: include/config/kernel.release
933 ifneq ($(KBUILD_SRC),)
934 @echo ' Using $(srctree) as source for kernel'
935 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
936 echo " $(srctree) is not clean, please run 'make mrproper'";\
937 echo " in the '$(srctree)' directory.";\
940 $(Q)if [ ! -d include2 ]; then \
942 ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm; \
946 # prepare2 creates a makefile if using a separate output directory
947 prepare2: prepare3 outputmakefile
949 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
950 include/asm include/config/auto.conf
953 archprepare: prepare1 scripts_basic
955 prepare0: archprepare FORCE
956 $(Q)$(MAKE) $(build)=.
957 $(Q)$(MAKE) $(build)=. missing-syscalls
959 # All the preparing..
962 # Leave this as default for preprocessing vmlinux.lds.S, which is now
963 # done in arch/$(ARCH)/kernel/Makefile
965 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
967 # The asm symlink changes when $(ARCH) changes.
968 # Detect this and ask user to run make mrproper
971 if [ -L include/asm ]; then \
972 asmlink=`readlink include/asm | cut -d '-' -f 2`; \
973 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
974 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
975 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
981 # We create the target directory of the symlink if it does
982 # not exist so the test in chack-symlink works and we have a
983 # directory for generated filesas used by some architectures.
984 define create-symlink
985 if [ ! -L include/asm ]; then \
986 echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
987 if [ ! -d include/asm-$(SRCARCH) ]; then \
988 mkdir -p include/asm-$(SRCARCH); \
990 ln -fsn asm-$(SRCARCH) $@; \
996 $(Q)$(create-symlink)
998 # Generate some files
999 # ---------------------------------------------------------------------------
1001 # KERNELRELEASE can change from a few different places, meaning version.h
1002 # needs to be updated, so this check is forced on all builds
1005 define filechk_utsrelease.h
1006 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1007 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1010 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1013 define filechk_version.h
1014 (echo \#define LINUX_VERSION_CODE $(shell \
1015 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1016 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1019 include/linux/version.h: $(srctree)/Makefile FORCE
1020 $(call filechk,version.h)
1022 include/linux/utsrelease.h: include/config/kernel.release FORCE
1023 $(call filechk,utsrelease.h)
1025 # ---------------------------------------------------------------------------
1029 @echo '*** Warning: make $@ is unnecessary now.'
1031 # ---------------------------------------------------------------------------
1033 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1034 export INSTALL_FW_PATH
1036 PHONY += firmware_install
1037 firmware_install: FORCE
1038 @mkdir -p $(objtree)/firmware
1039 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1041 # ---------------------------------------------------------------------------
1044 #Default location for installed headers
1045 export INSTALL_HDR_PATH = $(objtree)/usr
1047 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1048 # Find out where the Kbuild file is located to support
1049 # arch/$(ARCH)/include/asm
1051 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1052 arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1054 # If we do an all arch process set dst to asm-$(hdr-arch)
1055 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1058 __headers: include/linux/version.h scripts_basic FORCE
1059 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1061 PHONY += headers_install_all
1062 headers_install_all:
1063 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1065 PHONY += headers_install
1066 headers_install: __headers
1067 $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1068 $(error Headers not exportable for the $(SRCARCH) architecture))
1069 $(Q)$(MAKE) $(hdr-inst)=include
1070 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1072 PHONY += headers_check_all
1073 headers_check_all: headers_install_all
1074 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1076 PHONY += headers_check
1077 headers_check: headers_install
1078 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1079 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1081 # ---------------------------------------------------------------------------
1084 ifdef CONFIG_MODULES
1086 # By default, build modules as well
1092 # A module can be listed more than once in obj-m resulting in
1093 # duplicate lines in modules.order files. Those are removed
1094 # using awk while concatenating to the final file.
1097 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1098 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1099 @echo ' Building modules, stage 2.';
1100 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1101 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1104 # Target to prepare building external modules
1105 PHONY += modules_prepare
1106 modules_prepare: prepare scripts
1108 # Target to install modules
1109 PHONY += modules_install
1110 modules_install: _modinst_ _modinst_post
1114 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1115 echo "Warning: you may need to install module-init-tools"; \
1116 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1119 @rm -rf $(MODLIB)/kernel
1120 @rm -f $(MODLIB)/source
1121 @mkdir -p $(MODLIB)/kernel
1122 @ln -s $(srctree) $(MODLIB)/source
1123 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1124 rm -f $(MODLIB)/build ; \
1125 ln -s $(objtree) $(MODLIB)/build ; \
1127 @cp -f $(objtree)/modules.order $(MODLIB)/
1128 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1130 # This depmod is only for convenience to give the initial
1131 # boot a modules.dep even before / is mounted read-write. However the
1132 # boot script depmod is the master version.
1133 PHONY += _modinst_post
1134 _modinst_post: _modinst_
1135 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1138 else # CONFIG_MODULES
1140 # Modules not configured
1141 # ---------------------------------------------------------------------------
1143 modules modules_install: FORCE
1145 @echo "The present kernel configuration has modules disabled."
1146 @echo "Type 'make config' and enable loadable module support."
1147 @echo "Then build a kernel with module support enabled."
1151 endif # CONFIG_MODULES
1154 # Cleaning is done on three levels.
1155 # make clean Delete most generated files
1156 # Leave enough to build external modules
1157 # make mrproper Delete the current configuration, and all generated files
1158 # make distclean Remove editor backup files, patch leftover files and the like
1160 # Directories & files removed with 'make clean'
1161 CLEAN_DIRS += $(MODVERDIR)
1162 CLEAN_FILES += vmlinux System.map \
1163 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1165 # Directories & files removed with 'make mrproper'
1166 MRPROPER_DIRS += include/config include2 usr/include
1167 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1168 include/linux/autoconf.h include/linux/version.h \
1169 include/linux/utsrelease.h \
1170 include/linux/bounds.h include/asm*/asm-offsets.h \
1171 Module.symvers Module.markers tags TAGS cscope*
1173 # clean - Delete most, but leave enough to build external modules
1175 clean: rm-dirs := $(CLEAN_DIRS)
1176 clean: rm-files := $(CLEAN_FILES)
1177 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1179 PHONY += $(clean-dirs) clean archclean
1181 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1183 clean: archclean $(clean-dirs)
1186 @find . $(RCS_FIND_IGNORE) \
1187 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1188 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1189 -o -name '*.symtypes' -o -name 'modules.order' \
1190 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1191 -type f -print | xargs rm -f
1193 # mrproper - Delete all generated files, including .config
1195 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1196 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1197 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1199 PHONY += $(mrproper-dirs) mrproper archmrproper
1201 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1203 mrproper: clean archmrproper $(mrproper-dirs)
1212 @find $(srctree) $(RCS_FIND_IGNORE) \
1213 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1214 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1215 -o -name '.*.rej' -o -size 0 \
1216 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1217 -type f -print | xargs rm -f
1220 # Packaging of the kernel to various formats
1221 # ---------------------------------------------------------------------------
1222 # rpm target kept for backward compatibility
1223 package-dir := $(srctree)/scripts/package
1225 %pkg: include/config/kernel.release FORCE
1226 $(Q)$(MAKE) $(build)=$(package-dir) $@
1227 rpm: include/config/kernel.release FORCE
1228 $(Q)$(MAKE) $(build)=$(package-dir) $@
1231 # Brief documentation of the typical targets used
1232 # ---------------------------------------------------------------------------
1234 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1235 boards := $(notdir $(boards))
1236 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1237 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1240 @echo 'Cleaning targets:'
1241 @echo ' clean - Remove most generated files but keep the config and'
1242 @echo ' enough build support to build external modules'
1243 @echo ' mrproper - Remove all generated files + config + various backup files'
1244 @echo ' distclean - mrproper + remove editor backup and patch files'
1246 @echo 'Configuration targets:'
1247 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1249 @echo 'Other generic targets:'
1250 @echo ' all - Build all targets marked with [*]'
1251 @echo '* vmlinux - Build the bare kernel'
1252 @echo '* modules - Build all modules'
1253 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1254 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1255 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1256 @echo ' dir/ - Build all files in dir and below'
1257 @echo ' dir/file.[ois] - Build specified target only'
1258 @echo ' dir/file.ko - Build module including final link'
1259 @echo ' prepare - Set up for building external modules'
1260 @echo ' tags/TAGS - Generate tags file for editors'
1261 @echo ' cscope - Generate cscope index'
1262 @echo ' kernelrelease - Output the release version string'
1263 @echo ' kernelversion - Output the version stored in Makefile'
1264 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1265 echo ' (default: $(INSTALL_HDR_PATH))'; \
1267 @echo 'Static analysers'
1268 @echo ' checkstack - Generate a list of stack hogs'
1269 @echo ' namespacecheck - Name space analysis on compiled kernel'
1270 @echo ' versioncheck - Sanity check on version.h usage'
1271 @echo ' includecheck - Check for duplicate included header files'
1272 @echo ' export_report - List the usages of all exported symbols'
1273 @echo ' headers_check - Sanity check on exported headers'; \
1275 @echo 'Kernel packaging:'
1276 @$(MAKE) $(build)=$(package-dir) help
1278 @echo 'Documentation targets:'
1279 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1281 @echo 'Architecture specific targets ($(SRCARCH)):'
1282 @$(if $(archhelp),$(archhelp),\
1283 echo ' No architecture specific help defined for $(SRCARCH)')
1286 $(foreach b, $(boards), \
1287 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1289 @$(if $(board-dirs), \
1290 $(foreach b, $(board-dirs), \
1291 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1292 printf " %-16s - Show all of the above\\n" help-boards; \
1295 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1296 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1297 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1298 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1299 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1301 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1302 @echo 'For further info see the ./README file'
1305 help-board-dirs := $(addprefix help-,$(board-dirs))
1307 help-boards: $(help-board-dirs)
1309 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1311 $(help-board-dirs): help-%:
1312 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1313 @$(if $(boards-per-dir), \
1314 $(foreach b, $(boards-per-dir), \
1315 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1319 # Documentation targets
1320 # ---------------------------------------------------------------------------
1321 %docs: scripts_basic FORCE
1322 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1324 else # KBUILD_EXTMOD
1327 # External module support.
1328 # When building external modules the kernel used as basis is considered
1329 # read-only, and no consistency checks are made and the make
1330 # system is not used on the basis kernel. If updates are required
1331 # in the basis kernel ordinary make commands (without M=...) must
1334 # The following are the only valid targets when building external
1336 # make M=dir clean Delete all automatically generated files
1337 # make M=dir modules Make all modules in specified dir
1338 # make M=dir Same as 'make M=dir modules'
1339 # make M=dir modules_install
1340 # Install the modules built in the module directory
1341 # Assumes install directory is already created
1343 # We are always building modules
1345 PHONY += crmodverdir
1349 PHONY += $(objtree)/Module.symvers
1350 $(objtree)/Module.symvers:
1351 @test -e $(objtree)/Module.symvers || ( \
1353 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1354 echo " is missing; modules will have no dependencies and modversions."; \
1357 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1358 PHONY += $(module-dirs) modules
1359 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1360 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1362 modules: $(module-dirs)
1363 @echo ' Building modules, stage 2.';
1364 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1366 PHONY += modules_install
1367 modules_install: _emodinst_ _emodinst_post
1369 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1372 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1373 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1375 PHONY += _emodinst_post
1376 _emodinst_post: _emodinst_
1379 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1381 PHONY += $(clean-dirs) clean
1383 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1385 clean: rm-dirs := $(MODVERDIR)
1386 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1387 clean: $(clean-dirs)
1390 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1391 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1392 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1393 -type f -print | xargs rm -f
1396 @echo ' Building external modules.'
1397 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1399 @echo ' modules - default target, build the module(s)'
1400 @echo ' modules_install - install the module'
1401 @echo ' clean - remove generated files in module directory only'
1405 PHONY += prepare scripts
1408 endif # KBUILD_EXTMOD
1410 # Generate tags for editors
1411 # ---------------------------------------------------------------------------
1413 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1414 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1415 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1417 ifeq ($(src),$(obj))
1420 __srctree = $(srctree)/
1423 ifeq ($(ALLSOURCE_ARCHS),)
1425 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1427 ALLINCLUDE_ARCHS := $(SRCARCH)
1430 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1431 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1434 ALLSOURCE_ARCHS := $(SRCARCH)
1437 ( for arch in $(ALLSOURCE_ARCHS) ; do \
1438 find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1441 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1443 find $(__srctree)include $(RCS_FIND_IGNORE) \
1444 \( -name config -o -name 'asm-*' \) -prune \
1445 -o -name $1 -print; \
1446 for arch in $(ALLINCLUDE_ARCHS) ; do \
1447 test -e $(__srctree)include/asm-$${arch} && \
1448 find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1450 test -e $(__srctree)arch/$${arch}/include/asm && \
1451 find $(__srctree)arch/$${arch}/include/asm $(RCS_FIND_IGNORE) \
1454 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1456 find $(__srctree) $(RCS_FIND_IGNORE) \
1457 \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1463 $(call find-sources,'*.[chS]')
1466 $(call find-sources,'Kconfig*')
1468 define all-defconfigs
1469 $(call find-sources,'defconfig')
1473 if $1 --version 2>&1 | grep -iq exuberant; then \
1474 $(all-sources) | xargs $1 -a \
1475 -I __initdata,__exitdata,__acquires,__releases \
1476 -I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
1477 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1478 --extra=+f --c-kinds=+px \
1479 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1480 $(all-kconfigs) | xargs $1 -a \
1482 --language-force=kconfig \
1483 --regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
1484 $(all-defconfigs) | xargs -r $1 -a \
1485 --langdef=dotconfig \
1486 --language-force=dotconfig \
1487 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1488 elif $1 --version 2>&1 | grep -iq emacs; then \
1489 $(all-sources) | xargs $1 -a; \
1490 $(all-kconfigs) | xargs $1 -a \
1491 --regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
1492 $(all-defconfigs) | xargs -r $1 -a \
1493 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1495 $(all-sources) | xargs $1 -a; \
1499 quiet_cmd_cscope-file = FILELST cscope.files
1500 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1502 quiet_cmd_cscope = MAKE cscope.out
1503 cmd_cscope = cscope -b -f cscope.out
1506 $(call cmd,cscope-file)
1509 quiet_cmd_TAGS = MAKE $@
1518 quiet_cmd_tags = MAKE $@
1528 # Scripts to check various things for consistency
1529 # ---------------------------------------------------------------------------
1532 find * $(RCS_FIND_IGNORE) \
1533 -name '*.[hcS]' -type f -print | sort \
1534 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1537 find * $(RCS_FIND_IGNORE) \
1538 -name '*.[hcS]' -type f -print | sort \
1539 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1542 $(PERL) $(srctree)/scripts/namespace.pl
1545 $(PERL) $(srctree)/scripts/export_report.pl
1547 endif #ifeq ($(config-targets),1)
1548 endif #ifeq ($(mixed-targets),1)
1550 PHONY += checkstack kernelrelease kernelversion
1552 # UML needs a little special treatment here. It wants to use the host
1553 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1554 # else wants $(ARCH), including people doing cross-builds, which means
1555 # that $(SUBARCH) doesn't work here.
1557 CHECKSTACK_ARCH := $(SUBARCH)
1559 CHECKSTACK_ARCH := $(ARCH)
1562 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1563 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1566 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1567 $(error kernelrelease not valid - run 'make prepare' to update it))
1569 @echo $(KERNELVERSION)
1572 # ---------------------------------------------------------------------------
1573 # Single targets are compatible with:
1574 # - build with mixed source and output
1575 # - build with separate output dir 'make O=...'
1576 # - external modules
1578 # target-dir => where to store outputfile
1579 # build-dir => directory in kernel source tree to use
1581 ifeq ($(KBUILD_EXTMOD),)
1582 build-dir = $(patsubst %/,%,$(dir $@))
1583 target-dir = $(dir $@)
1585 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1586 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1587 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1590 %.s: %.c prepare scripts FORCE
1591 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1592 %.i: %.c prepare scripts FORCE
1593 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1594 %.o: %.c prepare scripts FORCE
1595 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1596 %.lst: %.c prepare scripts FORCE
1597 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1598 %.s: %.S prepare scripts FORCE
1599 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1600 %.o: %.S prepare scripts FORCE
1601 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1602 %.symtypes: %.c prepare scripts FORCE
1603 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1606 / %/: prepare scripts FORCE
1608 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1609 $(build)=$(build-dir)
1610 %.ko: prepare scripts FORCE
1612 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1613 $(build)=$(build-dir) $(@:.ko=.o)
1614 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1616 # FIXME Should go into a make.lib or something
1617 # ===========================================================================
1619 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1620 cmd_rmdirs = rm -rf $(rm-dirs)
1622 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1623 cmd_rmfiles = rm -f $(rm-files)
1625 # Run depmod only if we have System.map and depmod is executable
1626 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1628 if [ -r System.map -a -x $(DEPMOD) ]; then \
1629 $(DEPMOD) -ae -F System.map \
1630 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r) \
1634 # Create temporary dir for module support files
1635 # clean it up only when building all modules
1636 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1637 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1639 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1640 $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1641 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1643 quiet_cmd_as_o_S = AS $@
1644 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1646 # read all saved command lines
1648 targets := $(wildcard $(sort $(targets)))
1649 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1651 ifneq ($(cmd_files),)
1652 $(cmd_files): ; # Do not try to update included dependency files
1653 include $(cmd_files)
1656 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1658 # $(Q)$(MAKE) $(clean)=dir
1659 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1661 endif # skip-makefile
1666 # Declare the contents of the .PHONY variable as phony. We keep that
1667 # information in a variable se we can use it in if_changed and friends.