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 # We are using a recursive build, so we need to do a little thinking
20 # to get the ordering right.
22 # Most importantly: sub-Makefiles should only ever modify files in
23 # their own directory. If in some directory we have a dependency on
24 # a file in another dir (which doesn't happen often, but it's often
25 # unavoidable when linking the built-in.o targets which finally
26 # turn into vmlinux), we will call a sub make in that other dir, and
27 # after that we are sure that everything which is in that other dir
30 # The only cases where we need to modify files which have global
31 # effects are thus separated out and done before the recursive
32 # descending is started. They are now explicitly listed as the
35 # To put more focus on warnings, be less verbose as default
36 # Use 'make V=1' to see the full commands
39 ifeq ("$(origin V)", "command line")
47 # Call a source code checker (by default, "sparse") as part of the
50 # Use 'make C=1' to enable checking of only re-compiled files.
51 # Use 'make C=2' to enable checking of *all* source files, regardless
52 # of whether they are re-compiled or not.
54 # See the file "Documentation/sparse.txt" for more details, including
55 # where to get the "sparse" utility.
58 ifeq ("$(origin C)", "command line")
59 KBUILD_CHECKSRC = $(C)
62 ifndef KBUILD_CHECKSRC
66 # Use make M=dir to specify directory of external module to build
67 # Old syntax make ... SUBDIRS=$PWD is still supported
68 # Setting the environment variable KBUILD_EXTMOD take precedence
70 KBUILD_EXTMOD ?= $(SUBDIRS)
73 ifeq ("$(origin M)", "command line")
79 # kbuild supports saving output files in a separate directory.
80 # To locate output files in a separate directory two syntaxes are supported.
81 # In both cases the working directory must be the root of the kernel src.
83 # Use "make O=dir/to/store/output/files/"
85 # 2) Set KBUILD_OUTPUT
86 # Set the environment variable KBUILD_OUTPUT to point to the directory
87 # where the output files shall be placed.
88 # export KBUILD_OUTPUT=dir/to/store/output/files/
91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
95 # KBUILD_SRC is set on invocation of make in OBJ directory
96 # KBUILD_SRC is not intended to be used by the regular user (for now)
99 # OK, Make called in directory where kernel src resides
100 # Do we want to locate output files in a separate directory?
102 ifeq ("$(origin O)", "command line")
103 KBUILD_OUTPUT := $(O)
107 # That's our default target when none is given on the command line
111 # Cancel implicit rules on top Makefile
112 $(CURDIR)/Makefile Makefile: ;
114 ifneq ($(KBUILD_OUTPUT),)
115 # Invoke a second make in the output directory, passing relevant variables
116 # check that the output directory actually exists
117 saved-output := $(KBUILD_OUTPUT)
118 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
119 $(if $(KBUILD_OUTPUT),, \
120 $(error output directory "$(saved-output)" does not exist))
122 PHONY += $(MAKECMDGOALS) sub-make
124 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
128 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
129 KBUILD_SRC=$(CURDIR) \
130 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
131 $(filter-out _all sub-make,$(MAKECMDGOALS))
133 # Leave processing to above invocation of make
135 endif # ifneq ($(KBUILD_OUTPUT),)
136 endif # ifeq ($(KBUILD_SRC),)
138 # We process the rest of the Makefile if this is the final invocation of make
139 ifeq ($(skip-makefile),)
141 # If building an external module we do not care about the all: rule
142 # but instead _all depend on modules
144 ifeq ($(KBUILD_EXTMOD),)
150 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
152 # FIXME - TOPDIR is obsolete, use srctree/objtree
157 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
159 export srctree objtree VPATH TOPDIR
162 # SUBARCH tells the usermode build what the underlying arch is. That is set
163 # first, and if a usermode build is happening, the "ARCH=um" on the command
164 # line overrides the setting of ARCH below. If a native build is happening,
165 # then ARCH is assigned, getting whatever value it gets normally, and
166 # SUBARCH is subsequently ignored.
168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
174 # Cross compiling and selecting different set of gcc/bin-utils
175 # ---------------------------------------------------------------------------
177 # When performing cross compilation for other architectures ARCH shall be set
178 # to the target architecture. (See arch/* for the possibilities).
179 # ARCH can be set during invocation of make:
181 # Another way is to have ARCH set in the environment.
182 # The default ARCH is the host where make is executed.
184 # CROSS_COMPILE specify the prefix used for all executables used
185 # during compilation. Only gcc and related bin-utils executables
186 # are prefixed with $(CROSS_COMPILE).
187 # CROSS_COMPILE can be set on the command line
188 # make CROSS_COMPILE=ia64-linux-
189 # Alternatively CROSS_COMPILE can be set in the environment.
190 # Default value for CROSS_COMPILE is not to prefix executables
191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
192 export KBUILD_BUILDHOST := $(SUBARCH)
196 # Architecture as present in compile.h
197 UTS_MACHINE := $(ARCH)
200 # Additional ARCH settings for x86
204 ifeq ($(ARCH),x86_64)
208 # Where to locate arch specific headers
209 ifeq ($(ARCH),sparc64)
212 hdr-arch := $(SRCARCH)
215 KCONFIG_CONFIG ?= .config
217 # SHELL used by kbuild
218 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
219 else if [ -x /bin/bash ]; then echo /bin/bash; \
220 else echo sh; fi ; fi)
224 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
227 # Decide whether to build built-in, modular, or both.
228 # Normally, just do built-in.
233 # If we have only "make modules", don't compile built-in objects.
234 # When we're building modules with modversions, we need to consider
235 # the built-in objects during the descend as well, in order to
236 # make sure the checksums are up to date before we record them.
238 ifeq ($(MAKECMDGOALS),modules)
239 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
242 # If we have "make <whatever> modules", compile modules
243 # in addition to whatever we do anyway.
244 # Just "make" or "make all" shall build modules as well
246 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
250 ifeq ($(MAKECMDGOALS),)
254 export KBUILD_MODULES KBUILD_BUILTIN
255 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
258 # ---------------------------------------------------------------------------
260 # Normally, we echo the whole command before executing it. By making
261 # that echo $($(quiet)$(cmd)), we now have the possibility to set
262 # $(quiet) to choose other forms of output instead, e.g.
264 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
265 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
267 # If $(quiet) is empty, the whole command will be printed.
268 # If it is set to "quiet_", only the short version will be printed.
269 # If it is set to "silent_", nothing will be printed at all, since
270 # the variable $(silent_cmd_cc_o_c) doesn't exist.
272 # A simple variant is to prefix commands with $(Q) - that's useful
273 # for commands that shall be hidden in non-verbose mode.
277 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
278 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
280 ifeq ($(KBUILD_VERBOSE),1)
288 # If the user is running make -s (silent mode), suppress echoing of
291 ifneq ($(findstring s,$(MAKEFLAGS)),)
295 export quiet Q KBUILD_VERBOSE
298 # Look for make include files relative to root of kernel src
299 MAKEFLAGS += --include-dir=$(srctree)
301 # We need some generic definitions (do not try to remake the file).
302 $(srctree)/scripts/Kbuild.include: ;
303 include $(srctree)/scripts/Kbuild.include
305 # Make variables (CC, etc...)
307 AS = $(CROSS_COMPILE)as
308 LD = $(CROSS_COMPILE)ld
309 CC = $(CROSS_COMPILE)gcc
311 AR = $(CROSS_COMPILE)ar
312 NM = $(CROSS_COMPILE)nm
313 STRIP = $(CROSS_COMPILE)strip
314 OBJCOPY = $(CROSS_COMPILE)objcopy
315 OBJDUMP = $(CROSS_COMPILE)objdump
317 GENKSYMS = scripts/genksyms/genksyms
318 DEPMOD = /sbin/depmod
319 KALLSYMS = scripts/kallsyms
323 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
325 CFLAGS_MODULE = $(MODFLAGS)
326 AFLAGS_MODULE = $(MODFLAGS)
332 # Use LINUXINCLUDE when you must reference the include/ directory.
333 # Needed to be compatible with the O= option
334 LINUXINCLUDE := -Iinclude \
335 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
336 -I$(srctree)/arch/$(hdr-arch)/include \
337 -include include/linux/autoconf.h
339 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
341 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
342 -fno-strict-aliasing -fno-common \
343 -Werror-implicit-function-declaration
344 KBUILD_AFLAGS := -D__ASSEMBLY__
346 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
347 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
348 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
350 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
351 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
352 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
353 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
355 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
356 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
357 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
359 # When compiling out-of-tree modules, put MODVERDIR in the module
360 # tree rather than in the kernel tree. The kernel tree might
362 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
364 # Files to ignore in find ... statements
366 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
367 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
369 # ===========================================================================
370 # Rules shared between *config targets and build targets
372 # Basic helpers built in scripts/
373 PHONY += scripts_basic
375 $(Q)$(MAKE) $(build)=scripts/basic
377 # To avoid any implicit rule to kick in, define an empty command.
378 scripts/basic/%: scripts_basic ;
380 PHONY += outputmakefile
381 # outputmakefile generates a Makefile in the output directory, if using a
382 # separate output directory. This allows convenient use of make in the
385 ifneq ($(KBUILD_SRC),)
386 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
387 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
390 # To make sure we do not include .config for any of the *config targets
391 # catch them early, and hand them over to scripts/kconfig/Makefile
392 # It is allowed to specify more targets when calling make, including
393 # mixing *config targets and build targets.
394 # For example 'make oldconfig all'.
395 # Detect when mixed targets is specified, and make a second invocation
396 # of make so .config is not included in this case either (for *config).
398 no-dot-config-targets := clean mrproper distclean \
399 cscope TAGS tags help %docs check% \
400 include/linux/version.h headers_% \
401 kernelrelease kernelversion
407 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
408 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
413 ifeq ($(KBUILD_EXTMOD),)
414 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
416 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
422 ifeq ($(mixed-targets),1)
423 # ===========================================================================
424 # We're called with mixed targets (*config and build targets).
425 # Handle them one by one.
428 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
431 ifeq ($(config-targets),1)
432 # ===========================================================================
433 # *config targets only - make sure prerequisites are updated, and descend
434 # in scripts/kconfig to make the *config target
436 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
437 # KBUILD_DEFCONFIG may point out an alternative default configuration
438 # used for 'make defconfig'
439 include $(srctree)/arch/$(SRCARCH)/Makefile
440 export KBUILD_DEFCONFIG
442 config %config: scripts_basic outputmakefile FORCE
443 $(Q)mkdir -p include/linux include/config
444 $(Q)$(MAKE) $(build)=scripts/kconfig $@
447 # ===========================================================================
448 # Build targets only - this includes vmlinux, arch specific targets, clean
449 # targets and others. In general all targets except *config targets.
451 ifeq ($(KBUILD_EXTMOD),)
452 # Additional helpers built in scripts/
453 # Carefully list dependencies so we do not try to build scripts twice
456 scripts: scripts_basic include/config/auto.conf
457 $(Q)$(MAKE) $(build)=$(@)
459 # Objects we will link into vmlinux / subdirs we need to visit
461 drivers-y := drivers/ sound/ firmware/
465 endif # KBUILD_EXTMOD
467 ifeq ($(dot-config),1)
469 -include include/config/auto.conf
471 ifeq ($(KBUILD_EXTMOD),)
472 # Read in dependencies to all Kconfig* files, make sure to run
473 # oldconfig if changes are detected.
474 -include include/config/auto.conf.cmd
476 # To avoid any implicit rule to kick in, define an empty command
477 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
479 # If .config is newer than include/config/auto.conf, someone tinkered
480 # with it and forgot to run make oldconfig.
481 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
482 # we execute the config step to be sure to catch updated Kconfig files
483 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
484 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
486 # external modules needs include/linux/autoconf.h and include/config/auto.conf
487 # but do not care if they are up-to-date. Use auto.conf to trigger the test
488 PHONY += include/config/auto.conf
490 include/config/auto.conf:
491 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
493 echo " ERROR: Kernel configuration is invalid."; \
494 echo " include/linux/autoconf.h or $@ are missing."; \
495 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
499 endif # KBUILD_EXTMOD
502 # Dummy target needed, because used as prerequisite
503 include/config/auto.conf: ;
504 endif # $(dot-config)
506 # The all: target is the default when no target is given on the
508 # This allow a user to issue only 'make' to build a kernel including modules
509 # Defaults vmlinux but it is usually overridden in the arch makefile
512 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
518 include $(srctree)/arch/$(SRCARCH)/Makefile
520 ifneq (CONFIG_FRAME_WARN,0)
521 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
524 # Force gcc to behave correct even for buggy distributions
525 # Arch Makefiles may override this setting
526 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
528 ifdef CONFIG_FRAME_POINTER
529 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
531 KBUILD_CFLAGS += -fomit-frame-pointer
534 ifdef CONFIG_DEBUG_INFO
536 KBUILD_AFLAGS += -gdwarf-2
543 # We trigger additional mismatches with less inlining
544 ifdef CONFIG_DEBUG_SECTION_MISMATCH
545 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
548 # arch Makefile may override CC so keep this after arch Makefile is included
549 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
550 CHECKFLAGS += $(NOSTDINC_FLAGS)
552 # warn about C99 declaration after statement
553 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
555 # disable pointer signed / unsigned warnings in gcc 4.0
556 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
558 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
559 # But warn user when we do so
561 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
563 ifneq ($(KCPPFLAGS),)
564 $(call warn-assign,CPPFLAGS)
565 KBUILD_CPPFLAGS += $(KCPPFLAGS)
568 $(call warn-assign,AFLAGS)
569 KBUILD_AFLAGS += $(KAFLAGS)
572 $(call warn-assign,CFLAGS)
573 KBUILD_CFLAGS += $(KCFLAGS)
576 # Use --build-id when available.
577 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
578 $(call ld-option, -Wl$(comma)--build-id,))
579 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
580 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
582 # Default kernel image to build when no specific target is given.
583 # KBUILD_IMAGE may be overruled on the command line or
584 # set in the environment
585 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
587 export KBUILD_IMAGE ?= vmlinux
590 # INSTALL_PATH specifies where to place the updated kernel and system map
591 # images. Default is /boot, but you can set it to other values
592 export INSTALL_PATH ?= /boot
595 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
596 # relocations required by build roots. This is not defined in the
597 # makefile but the argument can be passed to make if needed.
600 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
604 # INSTALL_MOD_STRIP, if defined, will cause modules to be
605 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
606 # the default option --strip-debug will be used. Otherwise,
607 # INSTALL_MOD_STRIP will used as the options to the strip command.
609 ifdef INSTALL_MOD_STRIP
610 ifeq ($(INSTALL_MOD_STRIP),1)
611 mod_strip_cmd = $(STRIP) --strip-debug
613 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
614 endif # INSTALL_MOD_STRIP=1
617 endif # INSTALL_MOD_STRIP
621 ifeq ($(KBUILD_EXTMOD),)
622 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
624 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
625 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
626 $(net-y) $(net-m) $(libs-y) $(libs-m)))
628 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
630 $(core-n) $(core-) $(drivers-n) $(drivers-) \
631 $(net-n) $(net-) $(libs-n) $(libs-))))
633 init-y := $(patsubst %/, %/built-in.o, $(init-y))
634 core-y := $(patsubst %/, %/built-in.o, $(core-y))
635 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
636 net-y := $(patsubst %/, %/built-in.o, $(net-y))
637 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
638 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
639 libs-y := $(libs-y1) $(libs-y2)
642 # ---------------------------------------------------------------------------
643 # vmlinux is built from the objects selected by $(vmlinux-init) and
644 # $(vmlinux-main). Most are built-in.o files from top-level directories
645 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
646 # Ordering when linking is important, and $(vmlinux-init) must be first.
651 # +-< $(vmlinux-init)
652 # | +--< init/version.o + more
654 # +--< $(vmlinux-main)
655 # | +--< driver/built-in.o mm/built-in.o + more
657 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
659 # vmlinux version (uname -v) cannot be updated during normal
660 # descending-into-subdirs phase since we do not yet know if we need to
662 # Therefore this step is delayed until just before final link of vmlinux -
663 # except in the kallsyms case where it is done just before adding the
664 # symbols to the kernel.
666 # System.map is generated to document addresses of all kernel symbols
668 vmlinux-init := $(head-y) $(init-y)
669 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
670 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
671 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
672 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
674 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
675 # May be overridden by arch/$(ARCH)/Makefile
676 quiet_cmd_vmlinux__ ?= LD $@
677 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
678 -T $(vmlinux-lds) $(vmlinux-init) \
679 --start-group $(vmlinux-main) --end-group \
680 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
682 # Generate new vmlinux version
683 quiet_cmd_vmlinux_version = GEN .version
684 cmd_vmlinux_version = set -e; \
685 if [ ! -r .version ]; then \
689 mv .version .old_version; \
690 expr 0$$(cat .old_version) + 1 >.version; \
692 $(MAKE) $(build)=init
694 # Generate System.map
695 quiet_cmd_sysmap = SYSMAP
696 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
699 # If CONFIG_KALLSYMS is set .version is already updated
700 # Generate System.map and verify that the content is consistent
701 # Use + in front of the vmlinux_version rule to silent warning with make -j2
702 # First command is ':' to allow us to use + in front of the rule
703 define rule_vmlinux__
705 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
707 $(call cmd,vmlinux__)
708 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
710 $(Q)$(if $($(quiet)cmd_sysmap), \
711 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
712 $(cmd_sysmap) $@ System.map; \
713 if [ $$? -ne 0 ]; then \
721 ifdef CONFIG_KALLSYMS
722 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
723 # It's a three stage process:
724 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
726 # Running kallsyms on that gives us .tmp_kallsyms1.o with
727 # the right size - vmlinux version (uname -v) is updated during this step
728 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
729 # but due to the added section, some addresses have shifted.
730 # From here, we generate a correct .tmp_kallsyms2.o
731 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
732 # o Verify that the System.map from vmlinux matches the map from
733 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
734 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
735 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
736 # temporary bypass to allow the kernel to be built while the
737 # maintainers work out what went wrong with kallsyms.
739 ifdef CONFIG_KALLSYMS_EXTRA_PASS
745 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
747 define verify_kallsyms
748 $(Q)$(if $($(quiet)cmd_sysmap), \
749 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
750 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
751 $(Q)cmp -s System.map .tmp_System.map || \
752 (echo Inconsistent kallsyms data; \
753 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
754 rm .tmp_kallsyms* ; /bin/false )
757 # Update vmlinux version before link
758 # Use + in front of this rule to silent warning about make -j1
759 # First command is ':' to allow us to use + in front of this rule
760 cmd_ksym_ld = $(cmd_vmlinux__)
763 +$(call cmd,vmlinux_version)
764 $(call cmd,vmlinux__)
765 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
768 # Generate .S file with all kernel symbols
769 quiet_cmd_kallsyms = KSYM $@
770 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
771 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
773 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
774 $(call if_changed_dep,as_o_S)
776 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
779 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
780 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
781 $(call if_changed_rule,ksym_ld)
783 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
784 $(call if_changed,vmlinux__)
786 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
787 $(call if_changed,vmlinux__)
789 # Needs to visit scripts/ before $(KALLSYMS) can be used.
790 $(KALLSYMS): scripts ;
792 # Generate some data for debugging strange kallsyms problems
793 debug_kallsyms: .tmp_map$(last_kallsyms)
795 .tmp_map%: .tmp_vmlinux% FORCE
796 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
802 endif # ifdef CONFIG_KALLSYMS
804 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
805 # relevant sections renamed as per the linker script.
806 quiet_cmd_vmlinux-modpost = LD $@
807 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
808 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
809 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
810 define rule_vmlinux-modpost
812 +$(call cmd,vmlinux-modpost)
813 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
814 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
817 # vmlinux image - including updated kernel symbols
818 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
819 ifdef CONFIG_HEADERS_CHECK
820 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
823 $(Q)$(MAKE) $(build)=samples
825 ifdef CONFIG_BUILD_DOCSRC
826 $(Q)$(MAKE) $(build)=Documentation
828 $(call vmlinux-modpost)
829 $(call if_changed_rule,vmlinux__)
830 $(Q)rm -f .old_version
832 # build vmlinux.o first to catch section mismatch errors early
833 ifdef CONFIG_KALLSYMS
834 .tmp_vmlinux1: vmlinux.o
837 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
838 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
839 $(call if_changed_rule,vmlinux-modpost)
841 # The actual objects are generated when descending,
842 # make sure no implicit rule kicks in
843 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
845 # Handle descending into subdirectories listed in $(vmlinux-dirs)
846 # Preset locale variables to speed up the build process. Limit locale
847 # tweaks to this spot to avoid wrong language settings when running
848 # make menuconfig etc.
849 # Error messages still appears in the original language
851 PHONY += $(vmlinux-dirs)
852 $(vmlinux-dirs): prepare scripts
853 $(Q)$(MAKE) $(build)=$@
855 # Build the kernel release string
857 # The KERNELRELEASE value built here is stored in the file
858 # include/config/kernel.release, and is used when executing several
859 # make targets, such as "make install" or "make modules_install."
861 # The eventual kernel release string consists of the following fields,
862 # shown in a hierarchical format to show how smaller parts are concatenated
863 # to form the larger and final value, with values coming from places like
864 # the Makefile, kernel config options, make command line options and/or
865 # SCM tag information.
869 # $(PATCHLEVEL) eg, 6
871 # $(EXTRAVERSION) eg, -rc6
874 # localversion* (files without backups, containing '~')
875 # $(CONFIG_LOCALVERSION) (from kernel config setting)
876 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
877 # ./scripts/setlocalversion (SCM tag, if one exists)
878 # $(LOCALVERSION) (from make command line if provided)
880 # Note how the final $(localver-auto) string is included *only* if the
881 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
882 # moment, only git is supported but other SCMs can edit the script
883 # scripts/setlocalversion and add the appropriate checks as needed.
885 pattern = ".*/localversion[^~]*"
886 string = $(shell cat /dev/null \
887 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
889 localver = $(subst $(space),, $(string) \
890 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
892 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
893 # and if the SCM is know a tag from the SCM is appended.
894 # The appended tag is determined by the SCM used.
896 # Currently, only git is supported.
897 # Other SCMs can edit scripts/setlocalversion and add the appropriate
899 ifdef CONFIG_LOCALVERSION_AUTO
900 _localver-auto = $(shell $(CONFIG_SHELL) \
901 $(srctree)/scripts/setlocalversion $(srctree))
902 localver-auto = $(LOCALVERSION)$(_localver-auto)
905 localver-full = $(localver)$(localver-auto)
907 # Store (new) KERNELRELASE string in include/config/kernel.release
908 kernelrelease = $(KERNELVERSION)$(localver-full)
909 include/config/kernel.release: include/config/auto.conf FORCE
911 $(Q)echo $(kernelrelease) > $@
914 # Things we need to do before we recursively start building the kernel
915 # or the modules are listed in "prepare".
916 # A multi level approach is used. prepareN is processed before prepareN-1.
917 # archprepare is used in arch Makefiles and when processed asm symlink,
918 # version.h and scripts_basic is processed / created.
920 # Listed in dependency order
921 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
923 # prepare3 is used to check if we are building in a separate output directory,
925 # 1) Check that make has not been executed in the kernel src $(srctree)
926 # 2) Create the include2 directory, used for the second asm symlink
927 prepare3: include/config/kernel.release
928 ifneq ($(KBUILD_SRC),)
929 @echo ' Using $(srctree) as source for kernel'
930 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
931 echo " $(srctree) is not clean, please run 'make mrproper'";\
932 echo " in the '$(srctree)' directory.";\
935 $(Q)if [ ! -d include2 ]; then \
937 ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm; \
941 # prepare2 creates a makefile if using a separate output directory
942 prepare2: prepare3 outputmakefile
944 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
945 include/asm include/config/auto.conf
948 archprepare: prepare1 scripts_basic
950 prepare0: archprepare FORCE
951 $(Q)$(MAKE) $(build)=.
952 $(Q)$(MAKE) $(build)=. missing-syscalls
954 # All the preparing..
957 # Leave this as default for preprocessing vmlinux.lds.S, which is now
958 # done in arch/$(ARCH)/kernel/Makefile
960 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
962 # The asm symlink changes when $(ARCH) changes.
963 # Detect this and ask user to run make mrproper
966 if [ -L include/asm ]; then \
967 asmlink=`readlink include/asm | cut -d '-' -f 2`; \
968 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
969 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
970 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
976 # We create the target directory of the symlink if it does
977 # not exist so the test in chack-symlink works and we have a
978 # directory for generated filesas used by some architectures.
979 define create-symlink
980 if [ ! -L include/asm ]; then \
981 echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
982 if [ ! -d include/asm-$(SRCARCH) ]; then \
983 mkdir -p include/asm-$(SRCARCH); \
985 ln -fsn asm-$(SRCARCH) $@; \
991 $(Q)$(create-symlink)
993 # Generate some files
994 # ---------------------------------------------------------------------------
996 # KERNELRELEASE can change from a few different places, meaning version.h
997 # needs to be updated, so this check is forced on all builds
1000 define filechk_utsrelease.h
1001 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1002 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1005 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1008 define filechk_version.h
1009 (echo \#define LINUX_VERSION_CODE $(shell \
1010 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1011 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1014 include/linux/version.h: $(srctree)/Makefile FORCE
1015 $(call filechk,version.h)
1017 include/linux/utsrelease.h: include/config/kernel.release FORCE
1018 $(call filechk,utsrelease.h)
1020 # ---------------------------------------------------------------------------
1024 @echo '*** Warning: make $@ is unnecessary now.'
1026 # ---------------------------------------------------------------------------
1028 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1029 export INSTALL_FW_PATH
1031 PHONY += firmware_install
1032 firmware_install: FORCE
1033 @mkdir -p $(objtree)/firmware
1034 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1036 # ---------------------------------------------------------------------------
1039 #Default location for installed headers
1040 export INSTALL_HDR_PATH = $(objtree)/usr
1042 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1043 # Find out where the Kbuild file is located to support
1044 # arch/$(ARCH)/include/asm
1046 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1047 arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1049 # If we do an all arch process set dst to asm-$(hdr-arch)
1050 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1053 __headers: include/linux/version.h scripts_basic FORCE
1054 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1056 PHONY += headers_install_all
1057 headers_install_all:
1058 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1060 PHONY += headers_install
1061 headers_install: __headers
1062 $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1063 $(error Headers not exportable for the $(SRCARCH) architecture))
1064 $(Q)$(MAKE) $(hdr-inst)=include
1065 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1067 PHONY += headers_check_all
1068 headers_check_all: headers_install_all
1069 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1071 PHONY += headers_check
1072 headers_check: headers_install
1073 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1074 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1076 # ---------------------------------------------------------------------------
1079 ifdef CONFIG_MODULES
1081 # By default, build modules as well
1087 # A module can be listed more than once in obj-m resulting in
1088 # duplicate lines in modules.order files. Those are removed
1089 # using awk while concatenating to the final file.
1092 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1093 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1094 @echo ' Building modules, stage 2.';
1095 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1096 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1099 # Target to prepare building external modules
1100 PHONY += modules_prepare
1101 modules_prepare: prepare scripts
1103 # Target to install modules
1104 PHONY += modules_install
1105 modules_install: _modinst_ _modinst_post
1109 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1110 echo "Warning: you may need to install module-init-tools"; \
1111 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1114 @rm -rf $(MODLIB)/kernel
1115 @rm -f $(MODLIB)/source
1116 @mkdir -p $(MODLIB)/kernel
1117 @ln -s $(srctree) $(MODLIB)/source
1118 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1119 rm -f $(MODLIB)/build ; \
1120 ln -s $(objtree) $(MODLIB)/build ; \
1122 @cp -f $(objtree)/modules.order $(MODLIB)/
1123 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1125 # This depmod is only for convenience to give the initial
1126 # boot a modules.dep even before / is mounted read-write. However the
1127 # boot script depmod is the master version.
1128 PHONY += _modinst_post
1129 _modinst_post: _modinst_
1130 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1133 else # CONFIG_MODULES
1135 # Modules not configured
1136 # ---------------------------------------------------------------------------
1138 modules modules_install: FORCE
1140 @echo "The present kernel configuration has modules disabled."
1141 @echo "Type 'make config' and enable loadable module support."
1142 @echo "Then build a kernel with module support enabled."
1146 endif # CONFIG_MODULES
1149 # Cleaning is done on three levels.
1150 # make clean Delete most generated files
1151 # Leave enough to build external modules
1152 # make mrproper Delete the current configuration, and all generated files
1153 # make distclean Remove editor backup files, patch leftover files and the like
1155 # Directories & files removed with 'make clean'
1156 CLEAN_DIRS += $(MODVERDIR)
1157 CLEAN_FILES += vmlinux System.map \
1158 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1160 # Directories & files removed with 'make mrproper'
1161 MRPROPER_DIRS += include/config include2 usr/include
1162 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1163 include/linux/autoconf.h include/linux/version.h \
1164 include/linux/utsrelease.h \
1165 include/linux/bounds.h include/asm*/asm-offsets.h \
1166 Module.symvers Module.markers tags TAGS cscope*
1168 # clean - Delete most, but leave enough to build external modules
1170 clean: rm-dirs := $(CLEAN_DIRS)
1171 clean: rm-files := $(CLEAN_FILES)
1172 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1174 PHONY += $(clean-dirs) clean archclean
1176 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1178 clean: archclean $(clean-dirs)
1181 @find . $(RCS_FIND_IGNORE) \
1182 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1183 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1184 -o -name '*.symtypes' -o -name 'modules.order' \
1185 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1186 -type f -print | xargs rm -f
1188 # mrproper - Delete all generated files, including .config
1190 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1191 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1192 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1194 PHONY += $(mrproper-dirs) mrproper archmrproper
1196 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1198 mrproper: clean archmrproper $(mrproper-dirs)
1207 @find $(srctree) $(RCS_FIND_IGNORE) \
1208 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1209 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1210 -o -name '.*.rej' -o -size 0 \
1211 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1212 -type f -print | xargs rm -f
1215 # Packaging of the kernel to various formats
1216 # ---------------------------------------------------------------------------
1217 # rpm target kept for backward compatibility
1218 package-dir := $(srctree)/scripts/package
1220 %pkg: include/config/kernel.release FORCE
1221 $(Q)$(MAKE) $(build)=$(package-dir) $@
1222 rpm: include/config/kernel.release FORCE
1223 $(Q)$(MAKE) $(build)=$(package-dir) $@
1226 # Brief documentation of the typical targets used
1227 # ---------------------------------------------------------------------------
1229 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1230 boards := $(notdir $(boards))
1231 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1232 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1235 @echo 'Cleaning targets:'
1236 @echo ' clean - Remove most generated files but keep the config and'
1237 @echo ' enough build support to build external modules'
1238 @echo ' mrproper - Remove all generated files + config + various backup files'
1239 @echo ' distclean - mrproper + remove editor backup and patch files'
1241 @echo 'Configuration targets:'
1242 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1244 @echo 'Other generic targets:'
1245 @echo ' all - Build all targets marked with [*]'
1246 @echo '* vmlinux - Build the bare kernel'
1247 @echo '* modules - Build all modules'
1248 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1249 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1250 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1251 @echo ' dir/ - Build all files in dir and below'
1252 @echo ' dir/file.[ois] - Build specified target only'
1253 @echo ' dir/file.ko - Build module including final link'
1254 @echo ' prepare - Set up for building external modules'
1255 @echo ' tags/TAGS - Generate tags file for editors'
1256 @echo ' cscope - Generate cscope index'
1257 @echo ' kernelrelease - Output the release version string'
1258 @echo ' kernelversion - Output the version stored in Makefile'
1259 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1260 echo ' (default: $(INSTALL_HDR_PATH))'; \
1262 @echo 'Static analysers'
1263 @echo ' checkstack - Generate a list of stack hogs'
1264 @echo ' namespacecheck - Name space analysis on compiled kernel'
1265 @echo ' versioncheck - Sanity check on version.h usage'
1266 @echo ' includecheck - Check for duplicate included header files'
1267 @echo ' export_report - List the usages of all exported symbols'
1268 @echo ' headers_check - Sanity check on exported headers'; \
1270 @echo 'Kernel packaging:'
1271 @$(MAKE) $(build)=$(package-dir) help
1273 @echo 'Documentation targets:'
1274 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1276 @echo 'Architecture specific targets ($(SRCARCH)):'
1277 @$(if $(archhelp),$(archhelp),\
1278 echo ' No architecture specific help defined for $(SRCARCH)')
1281 $(foreach b, $(boards), \
1282 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1284 @$(if $(board-dirs), \
1285 $(foreach b, $(board-dirs), \
1286 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1287 printf " %-16s - Show all of the above\\n" help-boards; \
1290 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1291 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1292 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1293 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1294 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1296 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1297 @echo 'For further info see the ./README file'
1300 help-board-dirs := $(addprefix help-,$(board-dirs))
1302 help-boards: $(help-board-dirs)
1304 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1306 $(help-board-dirs): help-%:
1307 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1308 @$(if $(boards-per-dir), \
1309 $(foreach b, $(boards-per-dir), \
1310 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1314 # Documentation targets
1315 # ---------------------------------------------------------------------------
1316 %docs: scripts_basic FORCE
1317 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1319 else # KBUILD_EXTMOD
1322 # External module support.
1323 # When building external modules the kernel used as basis is considered
1324 # read-only, and no consistency checks are made and the make
1325 # system is not used on the basis kernel. If updates are required
1326 # in the basis kernel ordinary make commands (without M=...) must
1329 # The following are the only valid targets when building external
1331 # make M=dir clean Delete all automatically generated files
1332 # make M=dir modules Make all modules in specified dir
1333 # make M=dir Same as 'make M=dir modules'
1334 # make M=dir modules_install
1335 # Install the modules built in the module directory
1336 # Assumes install directory is already created
1338 # We are always building modules
1340 PHONY += crmodverdir
1344 PHONY += $(objtree)/Module.symvers
1345 $(objtree)/Module.symvers:
1346 @test -e $(objtree)/Module.symvers || ( \
1348 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1349 echo " is missing; modules will have no dependencies and modversions."; \
1352 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1353 PHONY += $(module-dirs) modules
1354 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1355 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1357 modules: $(module-dirs)
1358 @echo ' Building modules, stage 2.';
1359 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1361 PHONY += modules_install
1362 modules_install: _emodinst_ _emodinst_post
1364 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1367 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1368 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1370 PHONY += _emodinst_post
1371 _emodinst_post: _emodinst_
1374 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1376 PHONY += $(clean-dirs) clean
1378 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1380 clean: rm-dirs := $(MODVERDIR)
1381 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1382 clean: $(clean-dirs)
1385 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1386 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1387 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1388 -type f -print | xargs rm -f
1391 @echo ' Building external modules.'
1392 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1394 @echo ' modules - default target, build the module(s)'
1395 @echo ' modules_install - install the module'
1396 @echo ' clean - remove generated files in module directory only'
1400 PHONY += prepare scripts
1403 endif # KBUILD_EXTMOD
1405 # Generate tags for editors
1406 # ---------------------------------------------------------------------------
1408 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1409 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1410 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1412 ifeq ($(src),$(obj))
1415 __srctree = $(srctree)/
1418 ifeq ($(ALLSOURCE_ARCHS),)
1420 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1422 ALLINCLUDE_ARCHS := $(SRCARCH)
1425 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1426 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1429 ALLSOURCE_ARCHS := $(SRCARCH)
1432 ( for arch in $(ALLSOURCE_ARCHS) ; do \
1433 find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1436 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1438 find $(__srctree)include $(RCS_FIND_IGNORE) \
1439 \( -name config -o -name 'asm-*' \) -prune \
1440 -o -name $1 -print; \
1441 for arch in $(ALLINCLUDE_ARCHS) ; do \
1442 test -e $(__srctree)include/asm-$${arch} && \
1443 find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1445 test -e $(__srctree)arch/$${arch}/include/asm && \
1446 find $(__srctree)arch/$${arch}/include/asm $(RCS_FIND_IGNORE) \
1449 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1451 find $(__srctree) $(RCS_FIND_IGNORE) \
1452 \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1458 $(call find-sources,'*.[chS]')
1461 $(call find-sources,'Kconfig*')
1463 define all-defconfigs
1464 $(call find-sources,'defconfig')
1468 if $1 --version 2>&1 | grep -iq exuberant; then \
1469 $(all-sources) | xargs $1 -a \
1470 -I __initdata,__exitdata,__acquires,__releases \
1471 -I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
1472 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1473 --extra=+f --c-kinds=+px \
1474 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1475 $(all-kconfigs) | xargs $1 -a \
1477 --language-force=kconfig \
1478 --regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
1479 $(all-defconfigs) | xargs -r $1 -a \
1480 --langdef=dotconfig \
1481 --language-force=dotconfig \
1482 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1483 elif $1 --version 2>&1 | grep -iq emacs; then \
1484 $(all-sources) | xargs $1 -a; \
1485 $(all-kconfigs) | xargs $1 -a \
1486 --regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
1487 $(all-defconfigs) | xargs -r $1 -a \
1488 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1490 $(all-sources) | xargs $1 -a; \
1494 quiet_cmd_cscope-file = FILELST cscope.files
1495 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1497 quiet_cmd_cscope = MAKE cscope.out
1498 cmd_cscope = cscope -b -f cscope.out
1501 $(call cmd,cscope-file)
1504 quiet_cmd_TAGS = MAKE $@
1513 quiet_cmd_tags = MAKE $@
1523 # Scripts to check various things for consistency
1524 # ---------------------------------------------------------------------------
1527 find * $(RCS_FIND_IGNORE) \
1528 -name '*.[hcS]' -type f -print | sort \
1529 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1532 find * $(RCS_FIND_IGNORE) \
1533 -name '*.[hcS]' -type f -print | sort \
1534 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1537 $(PERL) $(srctree)/scripts/namespace.pl
1540 $(PERL) $(srctree)/scripts/export_report.pl
1542 endif #ifeq ($(config-targets),1)
1543 endif #ifeq ($(mixed-targets),1)
1545 PHONY += checkstack kernelrelease kernelversion
1547 # UML needs a little special treatment here. It wants to use the host
1548 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1549 # else wants $(ARCH), including people doing cross-builds, which means
1550 # that $(SUBARCH) doesn't work here.
1552 CHECKSTACK_ARCH := $(SUBARCH)
1554 CHECKSTACK_ARCH := $(ARCH)
1557 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1558 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1561 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1562 $(error kernelrelease not valid - run 'make prepare' to update it))
1564 @echo $(KERNELVERSION)
1567 # ---------------------------------------------------------------------------
1568 # Single targets are compatible with:
1569 # - build with mixed source and output
1570 # - build with separate output dir 'make O=...'
1571 # - external modules
1573 # target-dir => where to store outputfile
1574 # build-dir => directory in kernel source tree to use
1576 ifeq ($(KBUILD_EXTMOD),)
1577 build-dir = $(patsubst %/,%,$(dir $@))
1578 target-dir = $(dir $@)
1580 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1581 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1582 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1585 %.s: %.c prepare scripts FORCE
1586 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1587 %.i: %.c prepare scripts FORCE
1588 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1589 %.o: %.c prepare scripts FORCE
1590 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1591 %.lst: %.c prepare scripts FORCE
1592 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1593 %.s: %.S prepare scripts FORCE
1594 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1595 %.o: %.S prepare scripts FORCE
1596 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1597 %.symtypes: %.c prepare scripts FORCE
1598 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1601 / %/: prepare scripts FORCE
1603 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1604 $(build)=$(build-dir)
1605 %.ko: prepare scripts FORCE
1607 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1608 $(build)=$(build-dir) $(@:.ko=.o)
1609 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1611 # FIXME Should go into a make.lib or something
1612 # ===========================================================================
1614 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1615 cmd_rmdirs = rm -rf $(rm-dirs)
1617 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1618 cmd_rmfiles = rm -f $(rm-files)
1620 # Run depmod only if we have System.map and depmod is executable
1621 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1623 if [ -r System.map -a -x $(DEPMOD) ]; then \
1624 $(DEPMOD) -ae -F System.map \
1625 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r) \
1629 # Create temporary dir for module support files
1630 # clean it up only when building all modules
1631 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1632 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1634 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1635 $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1636 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1638 quiet_cmd_as_o_S = AS $@
1639 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1641 # read all saved command lines
1643 targets := $(wildcard $(sort $(targets)))
1644 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1646 ifneq ($(cmd_files),)
1647 $(cmd_files): ; # Do not try to update included dependency files
1648 include $(cmd_files)
1651 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1653 # $(Q)$(MAKE) $(clean)=dir
1654 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1656 endif # skip-makefile
1661 # Declare the contents of the .PHONY variable as phony. We keep that
1662 # information in a variable se we can use it in if_changed and friends.