5 NAME = Arr Matey! A Hairy Bilge Rat!
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 avoid hard-to-debug behavour);
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 := $(O)
107 # That's our default target when none is given on the command line
111 ifneq ($(KBUILD_OUTPUT),)
112 # Invoke a second make in the output directory, passing relevant variables
113 # check that the output directory actually exists
114 saved-output := $(KBUILD_OUTPUT)
115 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
116 $(if $(KBUILD_OUTPUT),, \
117 $(error output directory "$(saved-output)" does not exist))
118 # Check that OUTPUT directory is not the same as where we have kernel src
119 $(if $(filter-out $(KBUILD_OUTPUT),$(shell /bin/pwd)),, \
120 $(error Output directory (O=...) specifies kernel src dir))
122 PHONY += $(MAKECMDGOALS) sub-make
124 $(filter-out _all sub-make,$(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/ )
173 # Cross compiling and selecting different set of gcc/bin-utils
174 # ---------------------------------------------------------------------------
176 # When performing cross compilation for other architectures ARCH shall be set
177 # to the target architecture. (See arch/* for the possibilities).
178 # ARCH can be set during invocation of make:
180 # Another way is to have ARCH set in the environment.
181 # The default ARCH is the host where make is executed.
183 # CROSS_COMPILE specify the prefix used for all executables used
184 # during compilation. Only gcc and related bin-utils executables
185 # are prefixed with $(CROSS_COMPILE).
186 # CROSS_COMPILE can be set on the command line
187 # make CROSS_COMPILE=ia64-linux-
188 # Alternatively CROSS_COMPILE can be set in the environment.
189 # Default value for CROSS_COMPILE is not to prefix executables
190 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
195 # Architecture as present in compile.h
196 UTS_MACHINE := $(ARCH)
199 KCONFIG_CONFIG ?= .config
201 # SHELL used by kbuild
202 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
203 else if [ -x /bin/bash ]; then echo /bin/bash; \
204 else echo sh; fi ; fi)
208 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
211 # Decide whether to build built-in, modular, or both.
212 # Normally, just do built-in.
217 # If we have only "make modules", don't compile built-in objects.
218 # When we're building modules with modversions, we need to consider
219 # the built-in objects during the descend as well, in order to
220 # make sure the checksums are up to date before we record them.
222 ifeq ($(MAKECMDGOALS),modules)
223 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
226 # If we have "make <whatever> modules", compile modules
227 # in addition to whatever we do anyway.
228 # Just "make" or "make all" shall build modules as well
230 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
234 ifeq ($(MAKECMDGOALS),)
238 export KBUILD_MODULES KBUILD_BUILTIN
239 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
242 # ---------------------------------------------------------------------------
244 # Normally, we echo the whole command before executing it. By making
245 # that echo $($(quiet)$(cmd)), we now have the possibility to set
246 # $(quiet) to choose other forms of output instead, e.g.
248 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
249 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
251 # If $(quiet) is empty, the whole command will be printed.
252 # If it is set to "quiet_", only the short version will be printed.
253 # If it is set to "silent_", nothing will be printed at all, since
254 # the variable $(silent_cmd_cc_o_c) doesn't exist.
256 # A simple variant is to prefix commands with $(Q) - that's useful
257 # for commands that shall be hidden in non-verbose mode.
261 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
262 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
264 ifeq ($(KBUILD_VERBOSE),1)
272 # If the user is running make -s (silent mode), suppress echoing of
275 ifneq ($(findstring s,$(MAKEFLAGS)),)
279 export quiet Q KBUILD_VERBOSE
282 # Look for make include files relative to root of kernel src
283 MAKEFLAGS += --include-dir=$(srctree)
285 # We need some generic definitions.
286 include $(srctree)/scripts/Kbuild.include
288 # Make variables (CC, etc...)
290 AS = $(CROSS_COMPILE)as
291 LD = $(CROSS_COMPILE)ld
292 CC = $(CROSS_COMPILE)gcc
294 AR = $(CROSS_COMPILE)ar
295 NM = $(CROSS_COMPILE)nm
296 STRIP = $(CROSS_COMPILE)strip
297 OBJCOPY = $(CROSS_COMPILE)objcopy
298 OBJDUMP = $(CROSS_COMPILE)objdump
300 GENKSYMS = scripts/genksyms/genksyms
301 DEPMOD = /sbin/depmod
302 KALLSYMS = scripts/kallsyms
306 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
308 CFLAGS_MODULE = $(MODFLAGS)
309 AFLAGS_MODULE = $(MODFLAGS)
315 # Use LINUXINCLUDE when you must reference the include/ directory.
316 # Needed to be compatible with the O= option
317 LINUXINCLUDE := -Iinclude \
318 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
319 -include include/linux/autoconf.h
321 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
323 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
324 -fno-strict-aliasing -fno-common \
325 -Werror-implicit-function-declaration
326 KBUILD_AFLAGS := -D__ASSEMBLY__
328 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
329 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
330 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
332 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
333 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
334 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
335 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
337 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
338 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
339 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
341 # When compiling out-of-tree modules, put MODVERDIR in the module
342 # tree rather than in the kernel tree. The kernel tree might
344 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
346 # Files to ignore in find ... statements
348 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
349 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
351 # ===========================================================================
352 # Rules shared between *config targets and build targets
354 # Basic helpers built in scripts/
355 PHONY += scripts_basic
357 $(Q)$(MAKE) $(build)=scripts/basic
359 # To avoid any implicit rule to kick in, define an empty command.
360 scripts/basic/%: scripts_basic ;
362 PHONY += outputmakefile
363 # outputmakefile generates a Makefile in the output directory, if using a
364 # separate output directory. This allows convenient use of make in the
367 ifneq ($(KBUILD_SRC),)
368 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
369 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
372 # To make sure we do not include .config for any of the *config targets
373 # catch them early, and hand them over to scripts/kconfig/Makefile
374 # It is allowed to specify more targets when calling make, including
375 # mixing *config targets and build targets.
376 # For example 'make oldconfig all'.
377 # Detect when mixed targets is specified, and make a second invocation
378 # of make so .config is not included in this case either (for *config).
380 no-dot-config-targets := clean mrproper distclean \
381 cscope TAGS tags help %docs check% \
382 include/linux/version.h headers_% \
383 kernelrelease kernelversion
389 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
390 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
395 ifeq ($(KBUILD_EXTMOD),)
396 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
398 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
404 ifeq ($(mixed-targets),1)
405 # ===========================================================================
406 # We're called with mixed targets (*config and build targets).
407 # Handle them one by one.
410 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
413 ifeq ($(config-targets),1)
414 # ===========================================================================
415 # *config targets only - make sure prerequisites are updated, and descend
416 # in scripts/kconfig to make the *config target
418 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
419 # KBUILD_DEFCONFIG may point out an alternative default configuration
420 # used for 'make defconfig'
421 include $(srctree)/arch/$(ARCH)/Makefile
422 export KBUILD_DEFCONFIG
424 config %config: scripts_basic outputmakefile FORCE
425 $(Q)mkdir -p include/linux include/config
426 $(Q)$(MAKE) $(build)=scripts/kconfig $@
429 # ===========================================================================
430 # Build targets only - this includes vmlinux, arch specific targets, clean
431 # targets and others. In general all targets except *config targets.
433 ifeq ($(KBUILD_EXTMOD),)
434 # Additional helpers built in scripts/
435 # Carefully list dependencies so we do not try to build scripts twice
438 scripts: scripts_basic include/config/auto.conf
439 $(Q)$(MAKE) $(build)=$(@)
441 # Objects we will link into vmlinux / subdirs we need to visit
443 drivers-y := drivers/ sound/
447 endif # KBUILD_EXTMOD
449 ifeq ($(dot-config),1)
451 -include include/config/auto.conf
453 ifeq ($(KBUILD_EXTMOD),)
454 # Read in dependencies to all Kconfig* files, make sure to run
455 # oldconfig if changes are detected.
456 -include include/config/auto.conf.cmd
458 # To avoid any implicit rule to kick in, define an empty command
459 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
461 # If .config is newer than include/config/auto.conf, someone tinkered
462 # with it and forgot to run make oldconfig.
463 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
464 # we execute the config step to be sure to catch updated Kconfig files
465 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
466 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
468 # external modules needs include/linux/autoconf.h and include/config/auto.conf
469 # but do not care if they are up-to-date. Use auto.conf to trigger the test
470 PHONY += include/config/auto.conf
472 include/config/auto.conf:
473 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
475 echo " ERROR: Kernel configuration is invalid."; \
476 echo " include/linux/autoconf.h or $@ are missing."; \
477 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
481 endif # KBUILD_EXTMOD
484 # Dummy target needed, because used as prerequisite
485 include/config/auto.conf: ;
486 endif # $(dot-config)
488 # The all: target is the default when no target is given on the
490 # This allow a user to issue only 'make' to build a kernel including modules
491 # Defaults vmlinux but it is usually overridden in the arch makefile
494 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
500 include $(srctree)/arch/$(ARCH)/Makefile
502 ifdef CONFIG_FRAME_POINTER
503 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
505 KBUILD_CFLAGS += -fomit-frame-pointer
508 ifdef CONFIG_DEBUG_INFO
510 KBUILD_AFLAGS += -gdwarf-2
513 # Force gcc to behave correct even for buggy distributions
514 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
516 # arch Makefile may override CC so keep this after arch Makefile is included
517 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
518 CHECKFLAGS += $(NOSTDINC_FLAGS)
520 # warn about C99 declaration after statement
521 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
523 # disable pointer signed / unsigned warnings in gcc 4.0
524 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
526 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
527 KBUILD_CPPFLAGS += $(CPPFLAGS)
528 KBUILD_AFLAGS += $(AFLAGS)
529 KBUILD_CFLAGS += $(CFLAGS)
531 # Use --build-id when available.
532 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
533 $(call ld-option, -Wl$(comma)--build-id,))
534 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
535 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
537 # Default kernel image to build when no specific target is given.
538 # KBUILD_IMAGE may be overruled on the command line or
539 # set in the environment
540 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
542 export KBUILD_IMAGE ?= vmlinux
545 # INSTALL_PATH specifies where to place the updated kernel and system map
546 # images. Default is /boot, but you can set it to other values
547 export INSTALL_PATH ?= /boot
550 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
551 # relocations required by build roots. This is not defined in the
552 # makefile but the argument can be passed to make if needed.
555 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
559 # INSTALL_MOD_STRIP, if defined, will cause modules to be
560 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
561 # the default option --strip-debug will be used. Otherwise,
562 # INSTALL_MOD_STRIP will used as the options to the strip command.
564 ifdef INSTALL_MOD_STRIP
565 ifeq ($(INSTALL_MOD_STRIP),1)
566 mod_strip_cmd = $(STRIP) --strip-debug
568 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
569 endif # INSTALL_MOD_STRIP=1
572 endif # INSTALL_MOD_STRIP
576 ifeq ($(KBUILD_EXTMOD),)
577 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
579 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
580 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
581 $(net-y) $(net-m) $(libs-y) $(libs-m)))
583 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
585 $(core-n) $(core-) $(drivers-n) $(drivers-) \
586 $(net-n) $(net-) $(libs-n) $(libs-))))
588 init-y := $(patsubst %/, %/built-in.o, $(init-y))
589 core-y := $(patsubst %/, %/built-in.o, $(core-y))
590 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
591 net-y := $(patsubst %/, %/built-in.o, $(net-y))
592 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
593 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
594 libs-y := $(libs-y1) $(libs-y2)
597 # ---------------------------------------------------------------------------
598 # vmlinux is built from the objects selected by $(vmlinux-init) and
599 # $(vmlinux-main). Most are built-in.o files from top-level directories
600 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
601 # Ordering when linking is important, and $(vmlinux-init) must be first.
606 # +-< $(vmlinux-init)
607 # | +--< init/version.o + more
609 # +--< $(vmlinux-main)
610 # | +--< driver/built-in.o mm/built-in.o + more
612 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
614 # vmlinux version (uname -v) cannot be updated during normal
615 # descending-into-subdirs phase since we do not yet know if we need to
617 # Therefore this step is delayed until just before final link of vmlinux -
618 # except in the kallsyms case where it is done just before adding the
619 # symbols to the kernel.
621 # System.map is generated to document addresses of all kernel symbols
623 vmlinux-init := $(head-y) $(init-y)
624 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
625 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
626 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
627 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
629 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
630 # May be overridden by arch/$(ARCH)/Makefile
631 quiet_cmd_vmlinux__ ?= LD $@
632 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
633 -T $(vmlinux-lds) $(vmlinux-init) \
634 --start-group $(vmlinux-main) --end-group \
635 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
637 # Generate new vmlinux version
638 quiet_cmd_vmlinux_version = GEN .version
639 cmd_vmlinux_version = set -e; \
640 if [ ! -r .version ]; then \
644 mv .version .old_version; \
645 expr 0$$(cat .old_version) + 1 >.version; \
647 $(MAKE) $(build)=init
649 # Generate System.map
650 quiet_cmd_sysmap = SYSMAP
651 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
654 # If CONFIG_KALLSYMS is set .version is already updated
655 # Generate System.map and verify that the content is consistent
656 # Use + in front of the vmlinux_version rule to silent warning with make -j2
657 # First command is ':' to allow us to use + in front of the rule
658 define rule_vmlinux__
660 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
662 $(call cmd,vmlinux__)
663 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
665 $(Q)$(if $($(quiet)cmd_sysmap), \
666 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
667 $(cmd_sysmap) $@ System.map; \
668 if [ $$? -ne 0 ]; then \
676 ifdef CONFIG_KALLSYMS
677 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
678 # It's a three stage process:
679 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
681 # Running kallsyms on that gives us .tmp_kallsyms1.o with
682 # the right size - vmlinux version (uname -v) is updated during this step
683 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
684 # but due to the added section, some addresses have shifted.
685 # From here, we generate a correct .tmp_kallsyms2.o
686 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
687 # o Verify that the System.map from vmlinux matches the map from
688 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
689 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
690 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
691 # temporary bypass to allow the kernel to be built while the
692 # maintainers work out what went wrong with kallsyms.
694 ifdef CONFIG_KALLSYMS_EXTRA_PASS
700 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
702 define verify_kallsyms
703 $(Q)$(if $($(quiet)cmd_sysmap), \
704 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
705 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
706 $(Q)cmp -s System.map .tmp_System.map || \
707 (echo Inconsistent kallsyms data; \
708 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
709 rm .tmp_kallsyms* ; /bin/false )
712 # Update vmlinux version before link
713 # Use + in front of this rule to silent warning about make -j1
714 # First command is ':' to allow us to use + in front of this rule
715 cmd_ksym_ld = $(cmd_vmlinux__)
718 +$(call cmd,vmlinux_version)
719 $(call cmd,vmlinux__)
720 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
723 # Generate .S file with all kernel symbols
724 quiet_cmd_kallsyms = KSYM $@
725 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
726 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
728 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
729 $(call if_changed_dep,as_o_S)
731 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
734 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
735 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
736 $(call if_changed_rule,ksym_ld)
738 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
739 $(call if_changed,vmlinux__)
741 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
742 $(call if_changed,vmlinux__)
744 # Needs to visit scripts/ before $(KALLSYMS) can be used.
745 $(KALLSYMS): scripts ;
747 # Generate some data for debugging strange kallsyms problems
748 debug_kallsyms: .tmp_map$(last_kallsyms)
750 .tmp_map%: .tmp_vmlinux% FORCE
751 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
757 endif # ifdef CONFIG_KALLSYMS
759 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
760 # relevant sections renamed as per the linker script.
761 quiet_cmd_vmlinux-modpost = LD $@
762 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
763 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
764 $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
765 define rule_vmlinux-modpost
767 +$(call cmd,vmlinux-modpost)
768 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
769 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
772 # vmlinux image - including updated kernel symbols
773 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
774 ifdef CONFIG_HEADERS_CHECK
775 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
777 $(call vmlinux-modpost)
778 $(call if_changed_rule,vmlinux__)
779 $(Q)rm -f .old_version
781 vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
782 $(call if_changed_rule,vmlinux-modpost)
784 # The actual objects are generated when descending,
785 # make sure no implicit rule kicks in
786 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
788 # Handle descending into subdirectories listed in $(vmlinux-dirs)
789 # Preset locale variables to speed up the build process. Limit locale
790 # tweaks to this spot to avoid wrong language settings when running
791 # make menuconfig etc.
792 # Error messages still appears in the original language
794 PHONY += $(vmlinux-dirs)
795 $(vmlinux-dirs): prepare scripts
796 $(Q)$(MAKE) $(build)=$@
798 # Build the kernel release string
800 # The KERNELRELEASE value built here is stored in the file
801 # include/config/kernel.release, and is used when executing several
802 # make targets, such as "make install" or "make modules_install."
804 # The eventual kernel release string consists of the following fields,
805 # shown in a hierarchical format to show how smaller parts are concatenated
806 # to form the larger and final value, with values coming from places like
807 # the Makefile, kernel config options, make command line options and/or
808 # SCM tag information.
812 # $(PATCHLEVEL) eg, 6
814 # $(EXTRAVERSION) eg, -rc6
817 # localversion* (files without backups, containing '~')
818 # $(CONFIG_LOCALVERSION) (from kernel config setting)
819 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
820 # ./scripts/setlocalversion (SCM tag, if one exists)
821 # $(LOCALVERSION) (from make command line if provided)
823 # Note how the final $(localver-auto) string is included *only* if the
824 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
825 # moment, only git is supported but other SCMs can edit the script
826 # scripts/setlocalversion and add the appropriate checks as needed.
828 pattern = ".*/localversion[^~]*"
829 string = $(shell cat /dev/null \
830 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
832 localver = $(subst $(space),, $(string) \
833 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
835 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
836 # and if the SCM is know a tag from the SCM is appended.
837 # The appended tag is determined by the SCM used.
839 # Currently, only git is supported.
840 # Other SCMs can edit scripts/setlocalversion and add the appropriate
842 ifdef CONFIG_LOCALVERSION_AUTO
843 _localver-auto = $(shell $(CONFIG_SHELL) \
844 $(srctree)/scripts/setlocalversion $(srctree))
845 localver-auto = $(LOCALVERSION)$(_localver-auto)
848 localver-full = $(localver)$(localver-auto)
850 # Store (new) KERNELRELASE string in include/config/kernel.release
851 kernelrelease = $(KERNELVERSION)$(localver-full)
852 include/config/kernel.release: include/config/auto.conf FORCE
854 $(Q)echo $(kernelrelease) > $@
857 # Things we need to do before we recursively start building the kernel
858 # or the modules are listed in "prepare".
859 # A multi level approach is used. prepareN is processed before prepareN-1.
860 # archprepare is used in arch Makefiles and when processed asm symlink,
861 # version.h and scripts_basic is processed / created.
863 # Listed in dependency order
864 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
866 # prepare3 is used to check if we are building in a separate output directory,
868 # 1) Check that make has not been executed in the kernel src $(srctree)
869 # 2) Create the include2 directory, used for the second asm symlink
870 prepare3: include/config/kernel.release
871 ifneq ($(KBUILD_SRC),)
872 @echo ' Using $(srctree) as source for kernel'
873 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
874 echo " $(srctree) is not clean, please run 'make mrproper'";\
875 echo " in the '$(srctree)' directory.";\
878 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
879 $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
882 # prepare2 creates a makefile if using a separate output directory
883 prepare2: prepare3 outputmakefile
885 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
886 include/asm include/config/auto.conf
887 ifneq ($(KBUILD_MODULES),)
888 $(Q)mkdir -p $(MODVERDIR)
889 $(Q)rm -f $(MODVERDIR)/*
892 archprepare: prepare1 scripts_basic
894 prepare0: archprepare FORCE
895 $(Q)$(MAKE) $(build)=.
896 $(Q)$(MAKE) $(build)=. missing-syscalls
898 # All the preparing..
901 # Leave this as default for preprocessing vmlinux.lds.S, which is now
902 # done in arch/$(ARCH)/kernel/Makefile
904 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
906 # The asm symlink changes when $(ARCH) changes.
907 # Detect this and ask user to run make mrproper
910 $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`; \
911 if [ -L include/asm ]; then \
912 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
913 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
914 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
918 echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
919 if [ ! -d include ]; then \
922 ln -fsn asm-$(SRCARCH) $@; \
925 # Generate some files
926 # ---------------------------------------------------------------------------
928 # KERNELRELEASE can change from a few different places, meaning version.h
929 # needs to be updated, so this check is forced on all builds
932 define filechk_utsrelease.h
933 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
934 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
937 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
940 define filechk_version.h
941 (echo \#define LINUX_VERSION_CODE $(shell \
942 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
943 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
946 include/linux/version.h: $(srctree)/Makefile FORCE
947 $(call filechk,version.h)
949 include/linux/utsrelease.h: include/config/kernel.release FORCE
950 $(call filechk,utsrelease.h)
952 # ---------------------------------------------------------------------------
956 @echo '*** Warning: make $@ is unnecessary now.'
958 # ---------------------------------------------------------------------------
960 INSTALL_HDR_PATH=$(objtree)/usr
961 export INSTALL_HDR_PATH
963 HDRFILTER=generic i386 x86_64
964 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
966 PHONY += headers_install_all
967 headers_install_all: include/linux/version.h scripts_basic FORCE
968 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
969 $(Q)for arch in $(HDRARCHES); do \
970 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
973 PHONY += headers_install
974 headers_install: include/linux/version.h scripts_basic FORCE
975 @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
976 echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
978 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
979 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
981 PHONY += headers_check_all
982 headers_check_all: headers_install_all
983 $(Q)for arch in $(HDRARCHES); do \
984 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
987 PHONY += headers_check
988 headers_check: headers_install
989 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
991 # ---------------------------------------------------------------------------
996 # By default, build modules as well
1003 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1004 @echo ' Building modules, stage 2.';
1005 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1008 # Target to prepare building external modules
1009 PHONY += modules_prepare
1010 modules_prepare: prepare scripts
1012 # Target to install modules
1013 PHONY += modules_install
1014 modules_install: _modinst_ _modinst_post
1018 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1019 echo "Warning: you may need to install module-init-tools"; \
1020 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1023 @rm -rf $(MODLIB)/kernel
1024 @rm -f $(MODLIB)/source
1025 @mkdir -p $(MODLIB)/kernel
1026 @ln -s $(srctree) $(MODLIB)/source
1027 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1028 rm -f $(MODLIB)/build ; \
1029 ln -s $(objtree) $(MODLIB)/build ; \
1031 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1033 # If System.map exists, run depmod. This deliberately does not have a
1034 # dependency on System.map since that would run the dependency tree on
1035 # vmlinux. This depmod is only for convenience to give the initial
1036 # boot a modules.dep even before / is mounted read-write. However the
1037 # boot script depmod is the master version.
1038 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
1041 depmod_opts := -b $(INSTALL_MOD_PATH) -r
1043 PHONY += _modinst_post
1044 _modinst_post: _modinst_
1045 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
1047 else # CONFIG_MODULES
1049 # Modules not configured
1050 # ---------------------------------------------------------------------------
1052 modules modules_install: FORCE
1054 @echo "The present kernel configuration has modules disabled."
1055 @echo "Type 'make config' and enable loadable module support."
1056 @echo "Then build a kernel with module support enabled."
1060 endif # CONFIG_MODULES
1063 # Cleaning is done on three levels.
1064 # make clean Delete most generated files
1065 # Leave enough to build external modules
1066 # make mrproper Delete the current configuration, and all generated files
1067 # make distclean Remove editor backup files, patch leftover files and the like
1069 # Directories & files removed with 'make clean'
1070 CLEAN_DIRS += $(MODVERDIR)
1071 CLEAN_FILES += vmlinux System.map \
1072 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1074 # Directories & files removed with 'make mrproper'
1075 MRPROPER_DIRS += include/config include2 usr/include
1076 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1077 include/linux/autoconf.h include/linux/version.h \
1078 include/linux/utsrelease.h \
1079 Module.symvers tags TAGS cscope*
1081 # clean - Delete most, but leave enough to build external modules
1083 clean: rm-dirs := $(CLEAN_DIRS)
1084 clean: rm-files := $(CLEAN_FILES)
1085 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1087 PHONY += $(clean-dirs) clean archclean
1089 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1091 clean: archclean $(clean-dirs)
1094 @find . $(RCS_FIND_IGNORE) \
1095 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1096 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1097 -o -name '*.symtypes' \) \
1098 -type f -print | xargs rm -f
1100 # mrproper - Delete all generated files, including .config
1102 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1103 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1104 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1106 PHONY += $(mrproper-dirs) mrproper archmrproper
1108 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1110 mrproper: clean archmrproper $(mrproper-dirs)
1119 @find $(srctree) $(RCS_FIND_IGNORE) \
1120 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1121 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1122 -o -name '.*.rej' -o -size 0 \
1123 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1124 -type f -print | xargs rm -f
1127 # Packaging of the kernel to various formats
1128 # ---------------------------------------------------------------------------
1129 # rpm target kept for backward compatibility
1130 package-dir := $(srctree)/scripts/package
1132 %pkg: include/config/kernel.release FORCE
1133 $(Q)$(MAKE) $(build)=$(package-dir) $@
1134 rpm: include/config/kernel.release FORCE
1135 $(Q)$(MAKE) $(build)=$(package-dir) $@
1138 # Brief documentation of the typical targets used
1139 # ---------------------------------------------------------------------------
1141 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1142 boards := $(notdir $(boards))
1145 @echo 'Cleaning targets:'
1146 @echo ' clean - Remove most generated files but keep the config and'
1147 @echo ' enough build support to build external modules'
1148 @echo ' mrproper - Remove all generated files + config + various backup files'
1149 @echo ' distclean - mrproper + remove editor backup and patch files'
1151 @echo 'Configuration targets:'
1152 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1154 @echo 'Other generic targets:'
1155 @echo ' all - Build all targets marked with [*]'
1156 @echo '* vmlinux - Build the bare kernel'
1157 @echo '* modules - Build all modules'
1158 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1159 @echo ' dir/ - Build all files in dir and below'
1160 @echo ' dir/file.[ois] - Build specified target only'
1161 @echo ' dir/file.ko - Build module including final link'
1162 @echo ' rpm - Build a kernel as an RPM package'
1163 @echo ' tags/TAGS - Generate tags file for editors'
1164 @echo ' cscope - Generate cscope index'
1165 @echo ' kernelrelease - Output the release version string'
1166 @echo ' kernelversion - Output the version stored in Makefile'
1167 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1168 echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1169 echo ' (default: $(INSTALL_HDR_PATH))'; \
1172 @echo 'Static analysers'
1173 @echo ' checkstack - Generate a list of stack hogs'
1174 @echo ' namespacecheck - Name space analysis on compiled kernel'
1175 @echo ' export_report - List the usages of all exported symbols'
1176 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1177 echo ' headers_check - Sanity check on exported headers'; \
1180 @echo 'Kernel packaging:'
1181 @$(MAKE) $(build)=$(package-dir) help
1183 @echo 'Documentation targets:'
1184 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1186 @echo 'Architecture specific targets ($(ARCH)):'
1187 @$(if $(archhelp),$(archhelp),\
1188 echo ' No architecture specific help defined for $(ARCH)')
1191 $(foreach b, $(boards), \
1192 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1195 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1196 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1197 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1198 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1199 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1201 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1202 @echo 'For further info see the ./README file'
1205 # Documentation targets
1206 # ---------------------------------------------------------------------------
1207 %docs: scripts_basic FORCE
1208 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1210 else # KBUILD_EXTMOD
1213 # External module support.
1214 # When building external modules the kernel used as basis is considered
1215 # read-only, and no consistency checks are made and the make
1216 # system is not used on the basis kernel. If updates are required
1217 # in the basis kernel ordinary make commands (without M=...) must
1220 # The following are the only valid targets when building external
1222 # make M=dir clean Delete all automatically generated files
1223 # make M=dir modules Make all modules in specified dir
1224 # make M=dir Same as 'make M=dir modules'
1225 # make M=dir modules_install
1226 # Install the modules built in the module directory
1227 # Assumes install directory is already created
1229 # We are always building modules
1231 PHONY += crmodverdir
1233 $(Q)mkdir -p $(MODVERDIR)
1234 $(Q)rm -f $(MODVERDIR)/*
1236 PHONY += $(objtree)/Module.symvers
1237 $(objtree)/Module.symvers:
1238 @test -e $(objtree)/Module.symvers || ( \
1240 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1241 echo " is missing; modules will have no dependencies and modversions."; \
1244 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1245 PHONY += $(module-dirs) modules
1246 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1247 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1249 modules: $(module-dirs)
1250 @echo ' Building modules, stage 2.';
1251 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1253 PHONY += modules_install
1254 modules_install: _emodinst_ _emodinst_post
1256 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1259 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1260 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1262 # Run depmod only is we have System.map and depmod is executable
1263 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1264 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1265 $(DEPMOD) -ae -F System.map \
1266 $(if $(strip $(INSTALL_MOD_PATH)), \
1267 -b $(INSTALL_MOD_PATH) -r) \
1271 PHONY += _emodinst_post
1272 _emodinst_post: _emodinst_
1275 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1277 PHONY += $(clean-dirs) clean
1279 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1281 clean: rm-dirs := $(MODVERDIR)
1282 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1283 clean: $(clean-dirs)
1286 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1287 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1288 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1289 -type f -print | xargs rm -f
1292 @echo ' Building external modules.'
1293 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1295 @echo ' modules - default target, build the module(s)'
1296 @echo ' modules_install - install the module'
1297 @echo ' clean - remove generated files in module directory only'
1301 PHONY += prepare scripts
1304 endif # KBUILD_EXTMOD
1306 # Generate tags for editors
1307 # ---------------------------------------------------------------------------
1309 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1310 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1311 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1313 ifeq ($(src),$(obj))
1316 __srctree = $(srctree)/
1319 ifeq ($(ALLSOURCE_ARCHS),)
1321 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1323 ALLINCLUDE_ARCHS := $(SRCARCH)
1326 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1327 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1330 # Take care of arch/x86
1331 ifeq ($(ARCH), $(SRCARCH))
1332 ALLSOURCE_ARCHS := $(ARCH)
1334 ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
1338 ( for arch in $(ALLSOURCE_ARCHS) ; do \
1339 find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1342 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1344 find $(__srctree)include $(RCS_FIND_IGNORE) \
1345 \( -name config -o -name 'asm-*' \) -prune \
1346 -o -name $1 -print; \
1347 for arch in $(ALLINCLUDE_ARCHS) ; do \
1348 find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1351 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1353 find $(__srctree) $(RCS_FIND_IGNORE) \
1354 \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1360 $(call find-sources,'*.[chS]')
1363 $(call find-sources,'Kconfig*')
1365 define all-defconfigs
1366 $(call find-sources,'defconfig')
1370 if $1 --version 2>&1 | grep -iq exuberant; then \
1371 $(all-sources) | xargs $1 -a \
1372 -I __initdata,__exitdata,__acquires,__releases \
1373 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1374 --extra=+f --c-kinds=+px \
1375 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1376 $(all-kconfigs) | xargs $1 -a \
1378 --language-force=kconfig \
1379 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1380 $(all-defconfigs) | xargs -r $1 -a \
1381 --langdef=dotconfig \
1382 --language-force=dotconfig \
1383 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1384 elif $1 --version 2>&1 | grep -iq emacs; then \
1385 $(all-sources) | xargs $1 -a; \
1386 $(all-kconfigs) | xargs $1 -a \
1387 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1388 $(all-defconfigs) | xargs -r $1 -a \
1389 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1391 $(all-sources) | xargs $1 -a; \
1395 quiet_cmd_cscope-file = FILELST cscope.files
1396 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1398 quiet_cmd_cscope = MAKE cscope.out
1399 cmd_cscope = cscope -b
1402 $(call cmd,cscope-file)
1405 quiet_cmd_TAGS = MAKE $@
1414 quiet_cmd_tags = MAKE $@
1424 # Scripts to check various things for consistency
1425 # ---------------------------------------------------------------------------
1428 find * $(RCS_FIND_IGNORE) \
1429 -name '*.[hcS]' -type f -print | sort \
1430 | xargs $(PERL) -w scripts/checkincludes.pl
1433 find * $(RCS_FIND_IGNORE) \
1434 -name '*.[hcS]' -type f -print | sort \
1435 | xargs $(PERL) -w scripts/checkversion.pl
1438 $(PERL) $(srctree)/scripts/namespace.pl
1441 $(PERL) $(srctree)/scripts/export_report.pl
1443 endif #ifeq ($(config-targets),1)
1444 endif #ifeq ($(mixed-targets),1)
1446 PHONY += checkstack kernelrelease kernelversion
1448 # UML needs a little special treatment here. It wants to use the host
1449 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1450 # else wants $(ARCH), including people doing cross-builds, which means
1451 # that $(SUBARCH) doesn't work here.
1453 CHECKSTACK_ARCH := $(SUBARCH)
1455 CHECKSTACK_ARCH := $(ARCH)
1458 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1459 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1462 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1463 $(error kernelrelease not valid - run 'make prepare' to update it))
1465 @echo $(KERNELVERSION)
1468 # ---------------------------------------------------------------------------
1469 # Single targets are compatible with:
1470 # - build whith mixed source and output
1471 # - build with separate output dir 'make O=...'
1472 # - external modules
1474 # target-dir => where to store outputfile
1475 # build-dir => directory in kernel source tree to use
1477 ifeq ($(KBUILD_EXTMOD),)
1478 build-dir = $(patsubst %/,%,$(dir $@))
1479 target-dir = $(dir $@)
1481 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1482 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1483 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1486 %.s: %.c prepare scripts FORCE
1487 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1488 %.i: %.c prepare scripts FORCE
1489 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1490 %.o: %.c prepare scripts FORCE
1491 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1492 %.lst: %.c prepare scripts FORCE
1493 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1494 %.s: %.S prepare scripts FORCE
1495 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1496 %.o: %.S prepare scripts FORCE
1497 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1498 %.symtypes: %.c prepare scripts FORCE
1499 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1502 / %/: prepare scripts FORCE
1503 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1504 $(build)=$(build-dir)
1505 %.ko: prepare scripts FORCE
1506 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1507 $(build)=$(build-dir) $(@:.ko=.o)
1508 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1510 # FIXME Should go into a make.lib or something
1511 # ===========================================================================
1513 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1514 cmd_rmdirs = rm -rf $(rm-dirs)
1516 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1517 cmd_rmfiles = rm -f $(rm-files)
1520 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1521 $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1522 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1524 quiet_cmd_as_o_S = AS $@
1525 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1527 # read all saved command lines
1529 targets := $(wildcard $(sort $(targets)))
1530 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1532 ifneq ($(cmd_files),)
1533 $(cmd_files): ; # Do not try to update included dependency files
1534 include $(cmd_files)
1537 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1539 # $(Q)$(MAKE) $(clean)=dir
1540 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1542 endif # skip-makefile
1547 # Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1550 # Declare the contents of the .PHONY variable as phony. We keep that
1551 # information in a variable se we can use it in if_changed and friends.